Merge branch 'dccp' of git://eden-feed.erg.abdn.ac.uk/dccp_exp

Conflicts:

	net/dccp/input.c
	net/dccp/options.c

33 files changed, 3863 insertions, 2801 deletions

diff --git a/net/dccp/Kconfig b/net/dccp/Kconfig
index 7aa2a7acc7ec..206c16ad9c3c 100644
--- a/net/dccp/Kconfig
+++ b/net/dccp/Kconfig
@@ -25,9 +25,6 @@ config INET_DCCP_DIAG
         def_tristate y if (IP_DCCP = y && INET_DIAG = y)
         def_tristate m
 
-config IP_DCCP_ACKVEC
-        bool
-
 source "net/dccp/ccids/Kconfig"
 
 menu "DCCP Kernel Hacking"
diff --git a/net/dccp/Makefile b/net/dccp/Makefile
index f4f8793aafff..0c1c9af2bf7e 100644
--- a/net/dccp/Makefile
+++ b/net/dccp/Makefile
@@ -1,6 +1,7 @@
 obj-$(CONFIG_IP_DCCP) += dccp.o dccp_ipv4.o
 
-dccp-y := ccid.o feat.o input.o minisocks.o options.o output.o proto.o timer.o
+dccp-y := ccid.o feat.o input.o minisocks.o options.o \
+          qpolicy.o output.o proto.o timer.o ackvec.o
 
 dccp_ipv4-y := ipv4.o
 
@@ -8,8 +9,6 @@ dccp_ipv4-y := ipv4.o
 obj-$(subst y,$(CONFIG_IP_DCCP),$(CONFIG_IPV6)) += dccp_ipv6.o
 dccp_ipv6-y := ipv6.o
 
-dccp-$(CONFIG_IP_DCCP_ACKVEC) += ackvec.o
-
 obj-$(CONFIG_INET_DCCP_DIAG) += dccp_diag.o
 obj-$(CONFIG_NET_DCCPPROBE) += dccp_probe.o
 
diff --git a/net/dccp/ackvec.c b/net/dccp/ackvec.c
index 1e8be246ad15..41819848bdda 100644
--- a/net/dccp/ackvec.c
+++ b/net/dccp/ackvec.c
@@ -1,445 +1,375 @@
 /*
  *  net/dccp/ackvec.c
  *
- *  An implementation of the DCCP protocol
+ *  An implementation of Ack Vectors for the DCCP protocol
+ *  Copyright (c) 2007 University of Aberdeen, Scotland, UK
  *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
  *
  *      This program is free software; you can redistribute it and/or modify it
  *      under the terms of the GNU General Public License as published by the
  *      Free Software Foundation; version 2 of the License;
  */
-
-#include "ackvec.h"
 #include "dccp.h"
-
-#include <linux/dccp.h>
-#include <linux/init.h>
-#include <linux/errno.h>
 #include <linux/kernel.h>
-#include <linux/skbuff.h>
 #include <linux/slab.h>
 
-#include <net/sock.h>
-
 static struct kmem_cache *dccp_ackvec_slab;
 static struct kmem_cache *dccp_ackvec_record_slab;
 
-static struct dccp_ackvec_record *dccp_ackvec_record_new(void)
+struct dccp_ackvec *dccp_ackvec_alloc(const gfp_t priority)
 {
-        struct dccp_ackvec_record *avr =
-                        kmem_cache_alloc(dccp_ackvec_record_slab, GFP_ATOMIC);
+        struct dccp_ackvec *av = kmem_cache_zalloc(dccp_ackvec_slab, priority);
 
-        if (avr != NULL)
-                INIT_LIST_HEAD(&avr->avr_node);
-
-        return avr;
+        if (av != NULL) {
+                av->av_buf_head = av->av_buf_tail = DCCPAV_MAX_ACKVEC_LEN - 1;
+                INIT_LIST_HEAD(&av->av_records);
+        }
+        return av;
 }
 
-static void dccp_ackvec_record_delete(struct dccp_ackvec_record *avr)
+static void dccp_ackvec_purge_records(struct dccp_ackvec *av)
 {
-        if (unlikely(avr == NULL))
-                return;
-        /* Check if deleting a linked record */
-        WARN_ON(!list_empty(&avr->avr_node));
-        kmem_cache_free(dccp_ackvec_record_slab, avr);
+        struct dccp_ackvec_record *cur, *next;
+
+        list_for_each_entry_safe(cur, next, &av->av_records, avr_node)
+                kmem_cache_free(dccp_ackvec_record_slab, cur);
+        INIT_LIST_HEAD(&av->av_records);
 }
 
-static void dccp_ackvec_insert_avr(struct dccp_ackvec *av,
-                                   struct dccp_ackvec_record *avr)
+void dccp_ackvec_free(struct dccp_ackvec *av)
 {
-        /*
-         * AVRs are sorted by seqno. Since we are sending them in order, we
-         * just add the AVR at the head of the list.
-         * -sorbo.
-         */
-        if (!list_empty(&av->av_records)) {
-                const struct dccp_ackvec_record *head =
-                                        list_entry(av->av_records.next,
-                                                   struct dccp_ackvec_record,
-                                                   avr_node);
-                BUG_ON(before48(avr->avr_ack_seqno, head->avr_ack_seqno));
+        if (likely(av != NULL)) {
+                dccp_ackvec_purge_records(av);
+                kmem_cache_free(dccp_ackvec_slab, av);
         }
-
-        list_add(&avr->avr_node, &av->av_records);
 }
 
-int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
+/**
+ * dccp_ackvec_update_records  -  Record information about sent Ack Vectors
+ * @av:         Ack Vector records to update
+ * @seqno:      Sequence number of the packet carrying the Ack Vector just sent
+ * @nonce_sum:  The sum of all buffer nonces contained in the Ack Vector
+ */
+int dccp_ackvec_update_records(struct dccp_ackvec *av, u64 seqno, u8 nonce_sum)
 {
-        struct dccp_sock *dp = dccp_sk(sk);
-        struct dccp_ackvec *av = dp->dccps_hc_rx_ackvec;
-        /* Figure out how many options do we need to represent the ackvec */
-        const u16 nr_opts = DIV_ROUND_UP(av->av_vec_len, DCCP_MAX_ACKVEC_OPT_LEN);
-        u16 len = av->av_vec_len + 2 * nr_opts, i;
-        u32 elapsed_time;
-        const unsigned char *tail, *from;
-        unsigned char *to;
         struct dccp_ackvec_record *avr;
-        suseconds_t delta;
-
-        if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
-                return -1;
-
-        delta = ktime_us_delta(ktime_get_real(), av->av_time);
-        elapsed_time = delta / 10;
 
-        if (elapsed_time != 0 &&
-            dccp_insert_option_elapsed_time(sk, skb, elapsed_time))
-                return -1;
-
-        avr = dccp_ackvec_record_new();
+        avr = kmem_cache_alloc(dccp_ackvec_record_slab, GFP_ATOMIC);
         if (avr == NULL)
-                return -1;
-
-        DCCP_SKB_CB(skb)->dccpd_opt_len += len;
-
-        to   = skb_push(skb, len);
-        len  = av->av_vec_len;
-        from = av->av_buf + av->av_buf_head;
-        tail = av->av_buf + DCCP_MAX_ACKVEC_LEN;
-
-        for (i = 0; i < nr_opts; ++i) {
-                int copylen = len;
-
-                if (len > DCCP_MAX_ACKVEC_OPT_LEN)
-                        copylen = DCCP_MAX_ACKVEC_OPT_LEN;
-
-                *to++ = DCCPO_ACK_VECTOR_0;
-                *to++ = copylen + 2;
-
-                /* Check if buf_head wraps */
-                if (from + copylen > tail) {
-                        const u16 tailsize = tail - from;
-
-                        memcpy(to, from, tailsize);
-                        to      += tailsize;
-                        len     -= tailsize;
-                        copylen -= tailsize;
-                        from    = av->av_buf;
-                }
-
-                memcpy(to, from, copylen);
-                from += copylen;
-                to   += copylen;
-                len  -= copylen;
-        }
+                return -ENOBUFS;
 
+        avr->avr_ack_seqno  = seqno;
+        avr->avr_ack_ptr    = av->av_buf_head;
+        avr->avr_ack_ackno  = av->av_buf_ackno;
+        avr->avr_ack_nonce  = nonce_sum;
+        avr->avr_ack_runlen = dccp_ackvec_runlen(av->av_buf + av->av_buf_head);
         /*
-         *      From RFC 4340, A.2:
-         *
-         *      For each acknowledgement it sends, the HC-Receiver will add an
-         *      acknowledgement record.  ack_seqno will equal the HC-Receiver
-         *      sequence number it used for the ack packet; ack_ptr will equal
-         *      buf_head; ack_ackno will equal buf_ackno; and ack_nonce will
-         *      equal buf_nonce.
+         * When the buffer overflows, we keep no more than one record. This is
+         * the simplest way of disambiguating sender-Acks dating from before the
+         * overflow from sender-Acks which refer to after the overflow; a simple
+         * solution is preferable here since we are handling an exception.
          */
-        avr->avr_ack_seqno = DCCP_SKB_CB(skb)->dccpd_seq;
-        avr->avr_ack_ptr   = av->av_buf_head;
-        avr->avr_ack_ackno = av->av_buf_ackno;
-        avr->avr_ack_nonce = av->av_buf_nonce;
-        avr->avr_sent_len  = av->av_vec_len;
-
-        dccp_ackvec_insert_avr(av, avr);
+        if (av->av_overflow)
+                dccp_ackvec_purge_records(av);
+        /*
+         * Since GSS is incremented for each packet, the list is automatically
+         * arranged in descending order of @ack_seqno.
+         */
+        list_add(&avr->avr_node, &av->av_records);
 
-        dccp_pr_debug("%s ACK Vector 0, len=%d, ack_seqno=%llu, "
-                      "ack_ackno=%llu\n",
-                      dccp_role(sk), avr->avr_sent_len,
+        dccp_pr_debug("Added Vector, ack_seqno=%llu, ack_ackno=%llu (rl=%u)\n",
                       (unsigned long long)avr->avr_ack_seqno,
-                      (unsigned long long)avr->avr_ack_ackno);
+                      (unsigned long long)avr->avr_ack_ackno,
+                      avr->avr_ack_runlen);
         return 0;
 }
 
-struct dccp_ackvec *dccp_ackvec_alloc(const gfp_t priority)
+static struct dccp_ackvec_record *dccp_ackvec_lookup(struct list_head *av_list,
+                                                     const u64 ackno)
 {
-        struct dccp_ackvec *av = kmem_cache_alloc(dccp_ackvec_slab, priority);
-
-        if (av != NULL) {
-                av->av_buf_head  = DCCP_MAX_ACKVEC_LEN - 1;
-                av->av_buf_ackno = UINT48_MAX + 1;
-                av->av_buf_nonce = 0;
-                av->av_time      = ktime_set(0, 0);
-                av->av_vec_len   = 0;
-                INIT_LIST_HEAD(&av->av_records);
+        struct dccp_ackvec_record *avr;
+        /*
+         * Exploit that records are inserted in descending order of sequence
+         * number, start with the oldest record first. If @ackno is `before'
+         * the earliest ack_ackno, the packet is too old to be considered.
+         */
+        list_for_each_entry_reverse(avr, av_list, avr_node) {
+                if (avr->avr_ack_seqno == ackno)
+                        return avr;
+                if (before48(ackno, avr->avr_ack_seqno))
+                        break;
         }
-
-        return av;
+        return NULL;
 }
 
-void dccp_ackvec_free(struct dccp_ackvec *av)
+/*
+ * Buffer index and length computation using modulo-buffersize arithmetic.
+ * Note that, as pointers move from right to left, head is `before' tail.
+ */
+static inline u16 __ackvec_idx_add(const u16 a, const u16 b)
 {
-        if (unlikely(av == NULL))
-                return;
-
-        if (!list_empty(&av->av_records)) {
-                struct dccp_ackvec_record *avr, *next;
-
-                list_for_each_entry_safe(avr, next, &av->av_records, avr_node) {
-                        list_del_init(&avr->avr_node);
-                        dccp_ackvec_record_delete(avr);
-                }
-        }
-
-        kmem_cache_free(dccp_ackvec_slab, av);
+        return (a + b) % DCCPAV_MAX_ACKVEC_LEN;
 }
 
-static inline u8 dccp_ackvec_state(const struct dccp_ackvec *av,
-                                   const u32 index)
+static inline u16 __ackvec_idx_sub(const u16 a, const u16 b)
 {
-        return av->av_buf[index] & DCCP_ACKVEC_STATE_MASK;
+        return __ackvec_idx_add(a, DCCPAV_MAX_ACKVEC_LEN - b);
 }
 
-static inline u8 dccp_ackvec_len(const struct dccp_ackvec *av,
-                                 const u32 index)
+u16 dccp_ackvec_buflen(const struct dccp_ackvec *av)
 {
-        return av->av_buf[index] & DCCP_ACKVEC_LEN_MASK;
+        if (unlikely(av->av_overflow))
+                return DCCPAV_MAX_ACKVEC_LEN;
+        return __ackvec_idx_sub(av->av_buf_tail, av->av_buf_head);
 }
 
-/*
- * If several packets are missing, the HC-Receiver may prefer to enter multiple
- * bytes with run length 0, rather than a single byte with a larger run length;
- * this simplifies table updates if one of the missing packets arrives.
+/**
+ * dccp_ackvec_update_old  -  Update previous state as per RFC 4340, 11.4.1
+ * @av:         non-empty buffer to update
+ * @distance:   negative or zero distance of @seqno from buf_ackno downward
+ * @seqno:      the (old) sequence number whose record is to be updated
+ * @state:      state in which packet carrying @seqno was received
  */
-static inline int dccp_ackvec_set_buf_head_state(struct dccp_ackvec *av,
-                                                 const unsigned int packets,
-                                                 const unsigned char state)
+static void dccp_ackvec_update_old(struct dccp_ackvec *av, s64 distance,
+                                   u64 seqno, enum dccp_ackvec_states state)
 {
-        unsigned int gap;
-        long new_head;
+        u16 ptr = av->av_buf_head;
 
-        if (av->av_vec_len + packets > DCCP_MAX_ACKVEC_LEN)
-                return -ENOBUFS;
+        BUG_ON(distance > 0);
+        if (unlikely(dccp_ackvec_is_empty(av)))
+                return;
 
-        gap      = packets - 1;
-        new_head = av->av_buf_head - packets;
+        do {
+                u8 runlen = dccp_ackvec_runlen(av->av_buf + ptr);
 
-        if (new_head < 0) {
-                if (gap > 0) {
-                        memset(av->av_buf, DCCP_ACKVEC_STATE_NOT_RECEIVED,
-                               gap + new_head + 1);
-                        gap = -new_head;
+                if (distance + runlen >= 0) {
+                        /*
+                         * Only update the state if packet has not been received
+                         * yet. This is OK as per the second table in RFC 4340,
+                         * 11.4.1; i.e. here we are using the following table:
+                         *                     RECEIVED
+                         *                      0   1   3
+                         *              S     +---+---+---+
+                         *              T   0 | 0 | 0 | 0 |
+                         *              O     +---+---+---+
+                         *              R   1 | 1 | 1 | 1 |
+                         *              E     +---+---+---+
+                         *              D   3 | 0 | 1 | 3 |
+                         *                    +---+---+---+
+                         * The "Not Received" state was set by reserve_seats().
+                         */
+                        if (av->av_buf[ptr] == DCCPAV_NOT_RECEIVED)
+                                av->av_buf[ptr] = state;
+                        else
+                                dccp_pr_debug("Not changing %llu state to %u\n",
+                                              (unsigned long long)seqno, state);
+                        break;
                 }
-                new_head += DCCP_MAX_ACKVEC_LEN;
-        }
 
-        av->av_buf_head = new_head;
+                distance += runlen + 1;
+                ptr       = __ackvec_idx_add(ptr, 1);
 
-        if (gap > 0)
-                memset(av->av_buf + av->av_buf_head + 1,
-                       DCCP_ACKVEC_STATE_NOT_RECEIVED, gap);
+        } while (ptr != av->av_buf_tail);
+}
 
-        av->av_buf[av->av_buf_head] = state;
-        av->av_vec_len += packets;
-        return 0;
+/* Mark @num entries after buf_head as "Not yet received". */
+static void dccp_ackvec_reserve_seats(struct dccp_ackvec *av, u16 num)
+{
+        u16 start = __ackvec_idx_add(av->av_buf_head, 1),
+            len   = DCCPAV_MAX_ACKVEC_LEN - start;
+
+        /* check for buffer wrap-around */
+        if (num > len) {
+                memset(av->av_buf + start, DCCPAV_NOT_RECEIVED, len);
+                start = 0;
+                num  -= len;
+        }
+        if (num)
+                memset(av->av_buf + start, DCCPAV_NOT_RECEIVED, num);
 }
 
-/*
- * Implements the RFC 4340, Appendix A
+/**
+ * dccp_ackvec_add_new  -  Record one or more new entries in Ack Vector buffer
+ * @av:          container of buffer to update (can be empty or non-empty)
+ * @num_packets: number of packets to register (must be >= 1)
+ * @seqno:       sequence number of the first packet in @num_packets
+ * @state:       state in which packet carrying @seqno was received
  */
-int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
-                    const u64 ackno, const u8 state)
+static void dccp_ackvec_add_new(struct dccp_ackvec *av, u32 num_packets,
+                                u64 seqno, enum dccp_ackvec_states state)
 {
-        /*
-         * Check at the right places if the buffer is full, if it is, tell the
-         * caller to start dropping packets till the HC-Sender acks our ACK
-         * vectors, when we will free up space in av_buf.
-         *
-         * We may well decide to do buffer compression, etc, but for now lets
-         * just drop.
-         *
-         * From Appendix A.1.1 (`New Packets'):
-         *
-         *      Of course, the circular buffer may overflow, either when the
-         *      HC-Sender is sending data at a very high rate, when the
-         *      HC-Receiver's acknowledgements are not reaching the HC-Sender,
-         *      or when the HC-Sender is forgetting to acknowledge those acks
-         *      (so the HC-Receiver is unable to clean up old state). In this
-         *      case, the HC-Receiver should either compress the buffer (by
-         *      increasing run lengths when possible), transfer its state to
-         *      a larger buffer, or, as a last resort, drop all received
-         *      packets, without processing them whatsoever, until its buffer
-         *      shrinks again.
-         */
+        u32 num_cells = num_packets;
 
-        /* See if this is the first ackno being inserted */
-        if (av->av_vec_len == 0) {
-                av->av_buf[av->av_buf_head] = state;
-                av->av_vec_len = 1;
-        } else if (after48(ackno, av->av_buf_ackno)) {
-                const u64 delta = dccp_delta_seqno(av->av_buf_ackno, ackno);
+        if (num_packets > DCCPAV_BURST_THRESH) {
+                u32 lost_packets = num_packets - 1;
 
+                DCCP_WARN("Warning: large burst loss (%u)\n", lost_packets);
                 /*
-                 * Look if the state of this packet is the same as the
-                 * previous ackno and if so if we can bump the head len.
+                 * We received 1 packet and have a loss of size "num_packets-1"
+                 * which we squeeze into num_cells-1 rather than reserving an
+                 * entire byte for each lost packet.
+                 * The reason is that the vector grows in O(burst_length); when
+                 * it grows too large there will no room left for the payload.
+                 * This is a trade-off: if a few packets out of the burst show
+                 * up later, their state will not be changed; it is simply too
+                 * costly to reshuffle/reallocate/copy the buffer each time.
+                 * Should such problems persist, we will need to switch to a
+                 * different underlying data structure.
                  */
-                if (delta == 1 &&
-                    dccp_ackvec_state(av, av->av_buf_head) == state &&
-                    dccp_ackvec_len(av, av->av_buf_head) < DCCP_ACKVEC_LEN_MASK)
-                        av->av_buf[av->av_buf_head]++;
-                else if (dccp_ackvec_set_buf_head_state(av, delta, state))
-                        return -ENOBUFS;
-        } else {
-                /*
-                 * A.1.2.  Old Packets
-                 *
-                 *      When a packet with Sequence Number S <= buf_ackno
-                 *      arrives, the HC-Receiver will scan the table for
-                 *      the byte corresponding to S. (Indexing structures
-                 *      could reduce the complexity of this scan.)
-                 */
-                u64 delta = dccp_delta_seqno(ackno, av->av_buf_ackno);
-                u32 index = av->av_buf_head;
+                for (num_packets = num_cells = 1; lost_packets; ++num_cells) {
+                        u8 len = min(lost_packets, (u32)DCCPAV_MAX_RUNLEN);
 
-                while (1) {
-                        const u8 len = dccp_ackvec_len(av, index);
-                        const u8 av_state = dccp_ackvec_state(av, index);
-                        /*
-                         * valid packets not yet in av_buf have a reserved
-                         * entry, with a len equal to 0.
-                         */
-                        if (av_state == DCCP_ACKVEC_STATE_NOT_RECEIVED &&
-                            len == 0 && delta == 0) { /* Found our
-                                                         reserved seat! */
-                                dccp_pr_debug("Found %llu reserved seat!\n",
-                                              (unsigned long long)ackno);
-                                av->av_buf[index] = state;
-                                goto out;
-                        }
-                        /* len == 0 means one packet */
-                        if (delta < len + 1)
-                                goto out_duplicate;
-
-                        delta -= len + 1;
-                        if (++index == DCCP_MAX_ACKVEC_LEN)
-                                index = 0;
+                        av->av_buf_head = __ackvec_idx_sub(av->av_buf_head, 1);
+                        av->av_buf[av->av_buf_head] = DCCPAV_NOT_RECEIVED | len;
+
+                        lost_packets -= len;
                 }
         }
 
-        av->av_buf_ackno = ackno;
-        av->av_time = ktime_get_real();
-out:
-        return 0;
+        if (num_cells + dccp_ackvec_buflen(av) >= DCCPAV_MAX_ACKVEC_LEN) {
+                DCCP_CRIT("Ack Vector buffer overflow: dropping old entries\n");
+                av->av_overflow = true;
+        }
+
+        av->av_buf_head = __ackvec_idx_sub(av->av_buf_head, num_packets);
+        if (av->av_overflow)
+                av->av_buf_tail = av->av_buf_head;
 
-out_duplicate:
-        /* Duplicate packet */
-        dccp_pr_debug("Received a dup or already considered lost "
-                      "packet: %llu\n", (unsigned long long)ackno);
-        return -EILSEQ;
+        av->av_buf[av->av_buf_head] = state;
+        av->av_buf_ackno            = seqno;
+
+        if (num_packets > 1)
+                dccp_ackvec_reserve_seats(av, num_packets - 1);
 }
 
-static void dccp_ackvec_throw_record(struct dccp_ackvec *av,
-                                     struct dccp_ackvec_record *avr)
+/**
+ * dccp_ackvec_input  -  Register incoming packet in the buffer
+ */
+void dccp_ackvec_input(struct dccp_ackvec *av, struct sk_buff *skb)
 {
-        struct dccp_ackvec_record *next;
+        u64 seqno = DCCP_SKB_CB(skb)->dccpd_seq;
+        enum dccp_ackvec_states state = DCCPAV_RECEIVED;
 
-        /* sort out vector length */
-        if (av->av_buf_head <= avr->avr_ack_ptr)
-                av->av_vec_len = avr->avr_ack_ptr - av->av_buf_head;
-        else
-                av->av_vec_len = DCCP_MAX_ACKVEC_LEN - 1 -
-                                 av->av_buf_head + avr->avr_ack_ptr;
+        if (dccp_ackvec_is_empty(av)) {
+                dccp_ackvec_add_new(av, 1, seqno, state);
+                av->av_tail_ackno = seqno;
 
-        /* free records */
-        list_for_each_entry_safe_from(avr, next, &av->av_records, avr_node) {
-                list_del_init(&avr->avr_node);
-                dccp_ackvec_record_delete(avr);
-        }
-}
+        } else {
+                s64 num_packets = dccp_delta_seqno(av->av_buf_ackno, seqno);
+                u8 *current_head = av->av_buf + av->av_buf_head;
 
-void dccp_ackvec_check_rcv_ackno(struct dccp_ackvec *av, struct sock *sk,
-                                 const u64 ackno)
-{
-        struct dccp_ackvec_record *avr;
+                if (num_packets == 1 &&
+                    dccp_ackvec_state(current_head) == state &&
+                    dccp_ackvec_runlen(current_head) < DCCPAV_MAX_RUNLEN) {
 
-        /*
-         * If we traverse backwards, it should be faster when we have large
-         * windows. We will be receiving ACKs for stuff we sent a while back
-         * -sorbo.
-         */
-        list_for_each_entry_reverse(avr, &av->av_records, avr_node) {
-                if (ackno == avr->avr_ack_seqno) {
-                        dccp_pr_debug("%s ACK packet 0, len=%d, ack_seqno=%llu, "
-                                      "ack_ackno=%llu, ACKED!\n",
-                                      dccp_role(sk), 1,
-                                      (unsigned long long)avr->avr_ack_seqno,
-                                      (unsigned long long)avr->avr_ack_ackno);
-                        dccp_ackvec_throw_record(av, avr);
-                        break;
-                } else if (avr->avr_ack_seqno > ackno)
-                        break; /* old news */
+                        *current_head   += 1;
+                        av->av_buf_ackno = seqno;
+
+                } else if (num_packets > 0) {
+                        dccp_ackvec_add_new(av, num_packets, seqno, state);
+                } else {
+                        dccp_ackvec_update_old(av, num_packets, seqno, state);
+                }
         }
 }
 
-static void dccp_ackvec_check_rcv_ackvector(struct dccp_ackvec *av,
-                                            struct sock *sk, u64 *ackno,
-                                            const unsigned char len,
-                                            const unsigned char *vector)
-{
-        unsigned char i;
-        struct dccp_ackvec_record *avr;
+/**
+ * dccp_ackvec_clear_state  -  Perform house-keeping / garbage-collection
+ * This routine is called when the peer acknowledges the receipt of Ack Vectors
+ * up to and including @ackno. While based on on section A.3 of RFC 4340, here
+ * are additional precautions to prevent corrupted buffer state. In particular,
+ * we use tail_ackno to identify outdated records; it always marks the earliest
+ * packet of group (2) in 11.4.2.
+ */
+void dccp_ackvec_clear_state(struct dccp_ackvec *av, const u64 ackno)
+ {
+        struct dccp_ackvec_record *avr, *next;
+        u8 runlen_now, eff_runlen;
+        s64 delta;
 
-        /* Check if we actually sent an ACK vector */
-        if (list_empty(&av->av_records))
+        avr = dccp_ackvec_lookup(&av->av_records, ackno);
+        if (avr == NULL)
                 return;
+        /*
+         * Deal with outdated acknowledgments: this arises when e.g. there are
+         * several old records and the acks from the peer come in slowly. In
+         * that case we may still have records that pre-date tail_ackno.
+         */
+        delta = dccp_delta_seqno(av->av_tail_ackno, avr->avr_ack_ackno);
+        if (delta < 0)
+                goto free_records;
+        /*
+         * Deal with overlapping Ack Vectors: don't subtract more than the
+         * number of packets between tail_ackno and ack_ackno.
+         */
+        eff_runlen = delta < avr->avr_ack_runlen ? delta : avr->avr_ack_runlen;
 
-        i = len;
+        runlen_now = dccp_ackvec_runlen(av->av_buf + avr->avr_ack_ptr);
         /*
-         * XXX
-         * I think it might be more efficient to work backwards. See comment on
-         * rcv_ackno. -sorbo.
+         * The run length of Ack Vector cells does not decrease over time. If
+         * the run length is the same as at the time the Ack Vector was sent, we
+         * free the ack_ptr cell. That cell can however not be freed if the run
+         * length has increased: in this case we need to move the tail pointer
+         * backwards (towards higher indices), to its next-oldest neighbour.
          */
-        avr = list_entry(av->av_records.next, struct dccp_ackvec_record, avr_node);
-        while (i--) {
-                const u8 rl = *vector & DCCP_ACKVEC_LEN_MASK;
-                u64 ackno_end_rl;
+        if (runlen_now > eff_runlen) {
 
-                dccp_set_seqno(&ackno_end_rl, *ackno - rl);
+                av->av_buf[avr->avr_ack_ptr] -= eff_runlen + 1;
+                av->av_buf_tail = __ackvec_idx_add(avr->avr_ack_ptr, 1);
 
+                /* This move may not have cleared the overflow flag. */
+                if (av->av_overflow)
+                        av->av_overflow = (av->av_buf_head == av->av_buf_tail);
+        } else {
+                av->av_buf_tail = avr->avr_ack_ptr;
                 /*
-                 * If our AVR sequence number is greater than the ack, go
-                 * forward in the AVR list until it is not so.
+                 * We have made sure that avr points to a valid cell within the
+                 * buffer. This cell is either older than head, or equals head
+                 * (empty buffer): in both cases we no longer have any overflow.
                  */
-                list_for_each_entry_from(avr, &av->av_records, avr_node) {
-                        if (!after48(avr->avr_ack_seqno, *ackno))
-                                goto found;
-                }
-                /* End of the av_records list, not found, exit */
-                break;
-found:
-                if (between48(avr->avr_ack_seqno, ackno_end_rl, *ackno)) {
-                        const u8 state = *vector & DCCP_ACKVEC_STATE_MASK;
-                        if (state != DCCP_ACKVEC_STATE_NOT_RECEIVED) {
-                                dccp_pr_debug("%s ACK vector 0, len=%d, "
-                                              "ack_seqno=%llu, ack_ackno=%llu, "
-                                              "ACKED!\n",
-                                              dccp_role(sk), len,
-                                              (unsigned long long)
-                                              avr->avr_ack_seqno,
-                                              (unsigned long long)
-                                              avr->avr_ack_ackno);
-                                dccp_ackvec_throw_record(av, avr);
-                                break;
-                        }
-                        /*
-                         * If it wasn't received, continue scanning... we might
-                         * find another one.
-                         */
-                }
+                av->av_overflow = 0;
+        }
 
-                dccp_set_seqno(ackno, ackno_end_rl - 1);
-                ++vector;
+        /*
+         * The peer has acknowledged up to and including ack_ackno. Hence the
+         * first packet in group (2) of 11.4.2 is the successor of ack_ackno.
+         */
+        av->av_tail_ackno = ADD48(avr->avr_ack_ackno, 1);
+
+free_records:
+        list_for_each_entry_safe_from(avr, next, &av->av_records, avr_node) {
+                list_del(&avr->avr_node);
+                kmem_cache_free(dccp_ackvec_record_slab, avr);
         }
 }
 
-int dccp_ackvec_parse(struct sock *sk, const struct sk_buff *skb,
-                      u64 *ackno, const u8 opt, const u8 *value, const u8 len)
+/*
+ *      Routines to keep track of Ack Vectors received in an skb
+ */
+int dccp_ackvec_parsed_add(struct list_head *head, u8 *vec, u8 len, u8 nonce)
 {
-        if (len > DCCP_MAX_ACKVEC_OPT_LEN)
-                return -1;
+        struct dccp_ackvec_parsed *new = kmalloc(sizeof(*new), GFP_ATOMIC);
+
+        if (new == NULL)
+                return -ENOBUFS;
+        new->vec   = vec;
+        new->len   = len;
+        new->nonce = nonce;
 
-        /* dccp_ackvector_print(DCCP_SKB_CB(skb)->dccpd_ack_seq, value, len); */
-        dccp_ackvec_check_rcv_ackvector(dccp_sk(sk)->dccps_hc_rx_ackvec, sk,
-                                        ackno, len, value);
+        list_add_tail(&new->node, head);
         return 0;
 }
+EXPORT_SYMBOL_GPL(dccp_ackvec_parsed_add);
+
+void dccp_ackvec_parsed_cleanup(struct list_head *parsed_chunks)
+{
+        struct dccp_ackvec_parsed *cur, *next;
+
+        list_for_each_entry_safe(cur, next, parsed_chunks, node)
+                kfree(cur);
+        INIT_LIST_HEAD(parsed_chunks);
+}
+EXPORT_SYMBOL_GPL(dccp_ackvec_parsed_cleanup);
 
 int __init dccp_ackvec_init(void)
 {
@@ -449,10 +379,9 @@ int __init dccp_ackvec_init(void)
         if (dccp_ackvec_slab == NULL)
                 goto out_err;
 
-        dccp_ackvec_record_slab =
-                        kmem_cache_create("dccp_ackvec_record",
-                                          sizeof(struct dccp_ackvec_record),
-                                          0, SLAB_HWCACHE_ALIGN, NULL);
+        dccp_ackvec_record_slab = kmem_cache_create("dccp_ackvec_record",
+                                             sizeof(struct dccp_ackvec_record),
+                                             0, SLAB_HWCACHE_ALIGN, NULL);
         if (dccp_ackvec_record_slab == NULL)
                 goto out_destroy_slab;
 
diff --git a/net/dccp/ackvec.h b/net/dccp/ackvec.h
index bcb64fb4acef..6cdca79a99f7 100644
--- a/net/dccp/ackvec.h
+++ b/net/dccp/ackvec.h
@@ -3,156 +3,134 @@
 /*
  *  net/dccp/ackvec.h
  *
- *  An implementation of the DCCP protocol
+ *  An implementation of Ack Vectors for the DCCP protocol
+ *  Copyright (c) 2007 University of Aberdeen, Scotland, UK
  *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@mandriva.com>
- *
  *      This program is free software; you can redistribute it and/or modify it
  *      under the terms of the GNU General Public License version 2 as
  *      published by the Free Software Foundation.
  */
 
+#include <linux/dccp.h>
 #include <linux/compiler.h>
-#include <linux/ktime.h>
 #include <linux/list.h>
 #include <linux/types.h>
 
-/* Read about the ECN nonce to see why it is 253 */
-#define DCCP_MAX_ACKVEC_OPT_LEN 253
-/* We can spread an ack vector across multiple options */
-#define DCCP_MAX_ACKVEC_LEN (DCCP_MAX_ACKVEC_OPT_LEN * 2)
+/*
+ * Ack Vector buffer space is static, in multiples of %DCCP_SINGLE_OPT_MAXLEN,
+ * the maximum size of a single Ack Vector. Setting %DCCPAV_NUM_ACKVECS to 1
+ * will be sufficient for most cases of low Ack Ratios, using a value of 2 gives
+ * more headroom if Ack Ratio is higher or when the sender acknowledges slowly.
+ * The maximum value is bounded by the u16 types for indices and functions.
+ */
+#define DCCPAV_NUM_ACKVECS      2
+#define DCCPAV_MAX_ACKVEC_LEN   (DCCP_SINGLE_OPT_MAXLEN * DCCPAV_NUM_ACKVECS)
 
-#define DCCP_ACKVEC_STATE_RECEIVED      0
-#define DCCP_ACKVEC_STATE_ECN_MARKED    (1 << 6)
-#define DCCP_ACKVEC_STATE_NOT_RECEIVED  (3 << 6)
+/* Estimated minimum average Ack Vector length - used for updating MPS */
+#define DCCPAV_MIN_OPTLEN       16
 
-#define DCCP_ACKVEC_STATE_MASK          0xC0 /* 11000000 */
-#define DCCP_ACKVEC_LEN_MASK            0x3F /* 00111111 */
+/* Threshold for coping with large bursts of losses */
+#define DCCPAV_BURST_THRESH     (DCCPAV_MAX_ACKVEC_LEN / 8)
 
-/** struct dccp_ackvec - ack vector
- *
- * This data structure is the one defined in RFC 4340, Appendix A.
- *
- * @av_buf_head - circular buffer head
- * @av_buf_tail - circular buffer tail
- * @av_buf_ackno - ack # of the most recent packet acknowledgeable in the
- *                     buffer (i.e. %av_buf_head)
- * @av_buf_nonce - the one-bit sum of the ECN Nonces on all packets acked
- *                     by the buffer with State 0
- *
- * Additionally, the HC-Receiver must keep some information about the
- * Ack Vectors it has recently sent. For each packet sent carrying an
- * Ack Vector, it remembers four variables:
+enum dccp_ackvec_states {
+        DCCPAV_RECEIVED =       0x00,
+        DCCPAV_ECN_MARKED =     0x40,
+        DCCPAV_RESERVED =       0x80,
+        DCCPAV_NOT_RECEIVED =   0xC0
+};
+#define DCCPAV_MAX_RUNLEN       0x3F
+
+static inline u8 dccp_ackvec_runlen(const u8 *cell)
+{
+        return *cell & DCCPAV_MAX_RUNLEN;
+}
+
+static inline u8 dccp_ackvec_state(const u8 *cell)
+{
+        return *cell & ~DCCPAV_MAX_RUNLEN;
+}
+
+/** struct dccp_ackvec - Ack Vector main data structure
  *
- * @av_records - list of dccp_ackvec_record
- * @av_ack_nonce - the one-bit sum of the ECN Nonces for all State 0.
+ * This implements a fixed-size circular buffer within an array and is largely
+ * based on Appendix A of RFC 4340.
  *
- * @av_time - the time in usecs
- * @av_buf - circular buffer of acknowledgeable packets
+ * @av_buf:        circular buffer storage area
+ * @av_buf_head:   head index; begin of live portion in @av_buf
+ * @av_buf_tail:   tail index; first index _after_ the live portion in @av_buf
+ * @av_buf_ackno:  highest seqno of acknowledgeable packet recorded in @av_buf
+ * @av_tail_ackno: lowest  seqno of acknowledgeable packet recorded in @av_buf
+ * @av_buf_nonce:  ECN nonce sums, each covering subsequent segments of up to
+ *                 %DCCP_SINGLE_OPT_MAXLEN cells in the live portion of @av_buf
+ * @av_overflow:   if 1 then buf_head == buf_tail indicates buffer wraparound
+ * @av_records:    list of %dccp_ackvec_record (Ack Vectors sent previously)
  */
 struct dccp_ackvec {
-        u64                     av_buf_ackno;
-        struct list_head        av_records;
-        ktime_t                 av_time;
+        u8                      av_buf[DCCPAV_MAX_ACKVEC_LEN];
         u16                     av_buf_head;
-        u16                     av_vec_len;
-        u8                      av_buf_nonce;
-        u8                      av_ack_nonce;
-        u8                      av_buf[DCCP_MAX_ACKVEC_LEN];
+        u16                     av_buf_tail;
+        u64                     av_buf_ackno:48;
+        u64                     av_tail_ackno:48;
+        bool                    av_buf_nonce[DCCPAV_NUM_ACKVECS];
+        u8                      av_overflow:1;
+        struct list_head        av_records;
 };
 
-/** struct dccp_ackvec_record - ack vector record
+/** struct dccp_ackvec_record - Records information about sent Ack Vectors
  *
- * ACK vector record as defined in Appendix A of spec.
+ * These list entries define the additional information which the HC-Receiver
+ * keeps about recently-sent Ack Vectors; again refer to RFC 4340, Appendix A.
  *
- * The list is sorted by avr_ack_seqno
+ * @avr_node:       the list node in @av_records
+ * @avr_ack_seqno:  sequence number of the packet the Ack Vector was sent on
+ * @avr_ack_ackno:  the Ack number that this record/Ack Vector refers to
+ * @avr_ack_ptr:    pointer into @av_buf where this record starts
+ * @avr_ack_runlen: run length of @avr_ack_ptr at the time of sending
+ * @avr_ack_nonce:  the sum of @av_buf_nonce's at the time this record was sent
  *
- * @avr_node - node in av_records
- * @avr_ack_seqno - sequence number of the packet this record was sent on
- * @avr_ack_ackno - sequence number being acknowledged
- * @avr_ack_ptr - pointer into av_buf where this record starts
- * @avr_ack_nonce - av_ack_nonce at the time this record was sent
- * @avr_sent_len - lenght of the record in av_buf
+ * The list as a whole is sorted in descending order by @avr_ack_seqno.
  */
 struct dccp_ackvec_record {
         struct list_head avr_node;
-        u64              avr_ack_seqno;
-        u64              avr_ack_ackno;
+        u64              avr_ack_seqno:48;
+        u64              avr_ack_ackno:48;
         u16              avr_ack_ptr;
-        u16              avr_sent_len;
-        u8               avr_ack_nonce;
+        u8               avr_ack_runlen;
+        u8               avr_ack_nonce:1;
 };
 
-struct sock;
-struct sk_buff;
-
-#ifdef CONFIG_IP_DCCP_ACKVEC
-extern int dccp_ackvec_init(void);
+extern int  dccp_ackvec_init(void);
 extern void dccp_ackvec_exit(void);
 
 extern struct dccp_ackvec *dccp_ackvec_alloc(const gfp_t priority);
 extern void dccp_ackvec_free(struct dccp_ackvec *av);
 
-extern int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
-                           const u64 ackno, const u8 state);
-
-extern void dccp_ackvec_check_rcv_ackno(struct dccp_ackvec *av,
-                                        struct sock *sk, const u64 ackno);
-extern int dccp_ackvec_parse(struct sock *sk, const struct sk_buff *skb,
-                             u64 *ackno, const u8 opt,
-                             const u8 *value, const u8 len);
+extern void dccp_ackvec_input(struct dccp_ackvec *av, struct sk_buff *skb);
+extern int  dccp_ackvec_update_records(struct dccp_ackvec *av, u64 seq, u8 sum);
+extern void dccp_ackvec_clear_state(struct dccp_ackvec *av, const u64 ackno);
+extern u16  dccp_ackvec_buflen(const struct dccp_ackvec *av);
 
-extern int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb);
-
-static inline int dccp_ackvec_pending(const struct dccp_ackvec *av)
-{
-        return av->av_vec_len;
-}
-#else /* CONFIG_IP_DCCP_ACKVEC */
-static inline int dccp_ackvec_init(void)
+static inline bool dccp_ackvec_is_empty(const struct dccp_ackvec *av)
 {
-        return 0;
+        return av->av_overflow == 0 && av->av_buf_head == av->av_buf_tail;
 }
 
-static inline void dccp_ackvec_exit(void)
-{
-}
-
-static inline struct dccp_ackvec *dccp_ackvec_alloc(const gfp_t priority)
-{
-        return NULL;
-}
-
-static inline void dccp_ackvec_free(struct dccp_ackvec *av)
-{
-}
-
-static inline int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
-                                  const u64 ackno, const u8 state)
-{
-        return -1;
-}
-
-static inline void dccp_ackvec_check_rcv_ackno(struct dccp_ackvec *av,
-                                               struct sock *sk, const u64 ackno)
-{
-}
-
-static inline int dccp_ackvec_parse(struct sock *sk, const struct sk_buff *skb,
-                                    const u64 *ackno, const u8 opt,
-                                    const u8 *value, const u8 len)
-{
-        return -1;
-}
-
-static inline int dccp_insert_option_ackvec(const struct sock *sk,
-                                            const struct sk_buff *skb)
-{
-        return -1;
-}
+/**
+ * struct dccp_ackvec_parsed  -  Record offsets of Ack Vectors in skb
+ * @vec:        start of vector (offset into skb)
+ * @len:        length of @vec
+ * @nonce:      whether @vec had an ECN nonce of 0 or 1
+ * @node:       FIFO - arranged in descending order of ack_ackno
+ * This structure is used by CCIDs to access Ack Vectors in a received skb.
+ */
+struct dccp_ackvec_parsed {
+        u8               *vec,
+                         len,
+                         nonce:1;
+        struct list_head node;
+};
 
-static inline int dccp_ackvec_pending(const struct dccp_ackvec *av)
-{
-        return 0;
-}
-#endif /* CONFIG_IP_DCCP_ACKVEC */
+extern int dccp_ackvec_parsed_add(struct list_head *head,
+                                  u8 *vec, u8 len, u8 nonce);
+extern void dccp_ackvec_parsed_cleanup(struct list_head *parsed_chunks);
 #endif /* _ACKVEC_H */
diff --git a/net/dccp/ccid.c b/net/dccp/ccid.c
index 4809753d12ae..e3fb52b4f5c6 100644
--- a/net/dccp/ccid.c
+++ b/net/dccp/ccid.c
@@ -13,6 +13,13 @@
 
 #include "ccid.h"
 
+static u8 builtin_ccids[] = {
+        DCCPC_CCID2,            /* CCID2 is supported by default */
+#if defined(CONFIG_IP_DCCP_CCID3) || defined(CONFIG_IP_DCCP_CCID3_MODULE)
+        DCCPC_CCID3,
+#endif
+};
+
 static struct ccid_operations *ccids[CCID_MAX];
 #if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
 static atomic_t ccids_lockct = ATOMIC_INIT(0);
@@ -86,6 +93,47 @@ static void ccid_kmem_cache_destroy(struct kmem_cache *slab)
         }
 }
 
+/* check that up to @array_len members in @ccid_array are supported */
+bool ccid_support_check(u8 const *ccid_array, u8 array_len)
+{
+        u8 i, j, found;
+
+        for (i = 0, found = 0; i < array_len; i++, found = 0) {
+                for (j = 0; !found && j < ARRAY_SIZE(builtin_ccids); j++)
+                        found = (ccid_array[i] == builtin_ccids[j]);
+                if (!found)
+                        return false;
+        }
+        return true;
+}
+
+/**
+ * ccid_get_builtin_ccids  -  Provide copy of `builtin' CCID array
+ * @ccid_array: pointer to copy into
+ * @array_len: value to return length into
+ * This function allocates memory - caller must see that it is freed after use.
+ */
+int ccid_get_builtin_ccids(u8 **ccid_array, u8 *array_len)
+{
+        *ccid_array = kmemdup(builtin_ccids, sizeof(builtin_ccids), gfp_any());
+        if (*ccid_array == NULL)
+                return -ENOBUFS;
+        *array_len = ARRAY_SIZE(builtin_ccids);
+        return 0;
+}
+
+int ccid_getsockopt_builtin_ccids(struct sock *sk, int len,
+                                    char __user *optval, int __user *optlen)
+{
+        if (len < sizeof(builtin_ccids))
+                return -EINVAL;
+
+        if (put_user(sizeof(builtin_ccids), optlen) ||
+            copy_to_user(optval, builtin_ccids, sizeof(builtin_ccids)))
+                return -EFAULT;
+        return 0;
+}
+
 int ccid_register(struct ccid_operations *ccid_ops)
 {
         int err = -ENOBUFS;
@@ -148,22 +196,41 @@ int ccid_unregister(struct ccid_operations *ccid_ops)
 
 EXPORT_SYMBOL_GPL(ccid_unregister);
 
+/**
+ * ccid_request_module  -  Pre-load CCID module for later use
+ * This should be called only from process context (e.g. during connection
+ * setup) and is necessary for later calls to ccid_new (typically in software
+ * interrupt), so that it has the modules available when they are needed.
+ */
+static int ccid_request_module(u8 id)
+{
+        if (!in_atomic()) {
+                ccids_read_lock();
+                if (ccids[id] == NULL) {
+                        ccids_read_unlock();
+                        return request_module("net-dccp-ccid-%d", id);
+                }
+                ccids_read_unlock();
+        }
+        return 0;
+}
+
+int ccid_request_modules(u8 const *ccid_array, u8 array_len)
+{
+#ifdef CONFIG_KMOD
+        while (array_len--)
+                if (ccid_request_module(ccid_array[array_len]))
+                        return -1;
+#endif
+        return 0;
+}
+
 struct ccid *ccid_new(unsigned char id, struct sock *sk, int rx, gfp_t gfp)
 {
         struct ccid_operations *ccid_ops;
         struct ccid *ccid = NULL;
 
         ccids_read_lock();
-#ifdef CONFIG_KMOD
-        if (ccids[id] == NULL) {
-                /* We only try to load if in process context */
-                ccids_read_unlock();
-                if (gfp & GFP_ATOMIC)
-                        goto out;
-                request_module("net-dccp-ccid-%d", id);
-                ccids_read_lock();
-        }
-#endif
         ccid_ops = ccids[id];
         if (ccid_ops == NULL)
                 goto out_unlock;
@@ -205,20 +272,6 @@ out_module_put:
 
 EXPORT_SYMBOL_GPL(ccid_new);
 
-struct ccid *ccid_hc_rx_new(unsigned char id, struct sock *sk, gfp_t gfp)
-{
-        return ccid_new(id, sk, 1, gfp);
-}
-
-EXPORT_SYMBOL_GPL(ccid_hc_rx_new);
-
-struct ccid *ccid_hc_tx_new(unsigned char id,struct sock *sk,  gfp_t gfp)
-{
-        return ccid_new(id, sk, 0, gfp);
-}
-
-EXPORT_SYMBOL_GPL(ccid_hc_tx_new);
-
 static void ccid_delete(struct ccid *ccid, struct sock *sk, int rx)
 {
         struct ccid_operations *ccid_ops;
diff --git a/net/dccp/ccid.h b/net/dccp/ccid.h
index fdeae7b57319..d27054ba2159 100644
--- a/net/dccp/ccid.h
+++ b/net/dccp/ccid.h
@@ -60,22 +60,18 @@ struct ccid_operations {
         void            (*ccid_hc_tx_exit)(struct sock *sk);
         void            (*ccid_hc_rx_packet_recv)(struct sock *sk,
                                                   struct sk_buff *skb);
-        int             (*ccid_hc_rx_parse_options)(struct sock *sk,
-                                                    unsigned char option,
-                                                    unsigned char len, u16 idx,
-                                                    unsigned char* value);
+        int             (*ccid_hc_rx_parse_options)(struct sock *sk, u8 pkt,
+                                                    u8 opt, u8 *val, u8 len);
         int             (*ccid_hc_rx_insert_options)(struct sock *sk,
                                                      struct sk_buff *skb);
         void            (*ccid_hc_tx_packet_recv)(struct sock *sk,
                                                   struct sk_buff *skb);
-        int             (*ccid_hc_tx_parse_options)(struct sock *sk,
-                                                    unsigned char option,
-                                                    unsigned char len, u16 idx,
-                                                    unsigned char* value);
+        int             (*ccid_hc_tx_parse_options)(struct sock *sk, u8 pkt,
+                                                    u8 opt, u8 *val, u8 len);
         int             (*ccid_hc_tx_send_packet)(struct sock *sk,
                                                   struct sk_buff *skb);
         void            (*ccid_hc_tx_packet_sent)(struct sock *sk,
-                                                  int more, unsigned int len);
+                                                  unsigned int len);
         void            (*ccid_hc_rx_get_info)(struct sock *sk,
                                                struct tcp_info *info);
         void            (*ccid_hc_tx_get_info)(struct sock *sk,
@@ -103,31 +99,78 @@ static inline void *ccid_priv(const struct ccid *ccid)
         return (void *)ccid->ccid_priv;
 }
 
+extern bool ccid_support_check(u8 const *ccid_array, u8 array_len);
+extern int  ccid_get_builtin_ccids(u8 **ccid_array, u8 *array_len);
+extern int  ccid_getsockopt_builtin_ccids(struct sock *sk, int len,
+                                          char __user *, int __user *);
+
+extern int    ccid_request_modules(u8 const *ccid_array, u8 array_len);
 extern struct ccid *ccid_new(unsigned char id, struct sock *sk, int rx,
                              gfp_t gfp);
 
-extern struct ccid *ccid_hc_rx_new(unsigned char id, struct sock *sk,
-                                   gfp_t gfp);
-extern struct ccid *ccid_hc_tx_new(unsigned char id, struct sock *sk,
-                                   gfp_t gfp);
+static inline int ccid_get_current_rx_ccid(struct dccp_sock *dp)
+{
+        struct ccid *ccid = dp->dccps_hc_rx_ccid;
+
+        if (ccid == NULL || ccid->ccid_ops == NULL)
+                return -1;
+        return ccid->ccid_ops->ccid_id;
+}
+
+static inline int ccid_get_current_tx_ccid(struct dccp_sock *dp)
+{
+        struct ccid *ccid = dp->dccps_hc_tx_ccid;
+
+        if (ccid == NULL || ccid->ccid_ops == NULL)
+                return -1;
+        return ccid->ccid_ops->ccid_id;
+}
 
 extern void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk);
 extern void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk);
 
+/*
+ * Congestion control of queued data packets via CCID decision.
+ *
+ * The TX CCID performs its congestion-control by indicating whether and when a
+ * queued packet may be sent, using the return code of ccid_hc_tx_send_packet().
+ * The following modes are supported via the symbolic constants below:
+ * - timer-based pacing    (CCID returns a delay value in milliseconds);
+ * - autonomous dequeueing (CCID internally schedules dccps_xmitlet).
+ */
+
+enum ccid_dequeueing_decision {
+        CCID_PACKET_SEND_AT_ONCE =       0x00000,  /* "green light": no delay */
+        CCID_PACKET_DELAY_MAX =          0x0FFFF,  /* maximum delay in msecs  */
+        CCID_PACKET_DELAY =              0x10000,  /* CCID msec-delay mode */
+        CCID_PACKET_WILL_DEQUEUE_LATER = 0x20000,  /* CCID autonomous mode */
+        CCID_PACKET_ERR =                0xF0000,  /* error condition */
+};
+
+static inline int ccid_packet_dequeue_eval(const int return_code)
+{
+        if (return_code < 0)
+                return CCID_PACKET_ERR;
+        if (return_code == 0)
+                return CCID_PACKET_SEND_AT_ONCE;
+        if (return_code <= CCID_PACKET_DELAY_MAX)
+                return CCID_PACKET_DELAY;
+        return return_code;
+}
+
 static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk,
                                          struct sk_buff *skb)
 {
-        int rc = 0;
         if (ccid->ccid_ops->ccid_hc_tx_send_packet != NULL)
-                rc = ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb);
-        return rc;
+                return ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb);
+        return CCID_PACKET_SEND_AT_ONCE;
 }
 
 static inline void ccid_hc_tx_packet_sent(struct ccid *ccid, struct sock *sk,
-                                          int more, unsigned int len)
+                                          unsigned int len)
 {
         if (ccid->ccid_ops->ccid_hc_tx_packet_sent != NULL)
-                ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, more, len);
+                ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, len);
 }
 
 static inline void ccid_hc_rx_packet_recv(struct ccid *ccid, struct sock *sk,
@@ -144,27 +187,31 @@ static inline void ccid_hc_tx_packet_recv(struct ccid *ccid, struct sock *sk,
                 ccid->ccid_ops->ccid_hc_tx_packet_recv(sk, skb);
 }
 
+/**
+ * ccid_hc_tx_parse_options  -  Parse CCID-specific options sent by the receiver
+ * @pkt: type of packet that @opt appears on (RFC 4340, 5.1)
+ * @opt: the CCID-specific option type (RFC 4340, 5.8 and 10.3)
+ * @val: value of @opt
+ * @len: length of @val in bytes
+ */
 static inline int ccid_hc_tx_parse_options(struct ccid *ccid, struct sock *sk,
-                                           unsigned char option,
-                                           unsigned char len, u16 idx,
-                                           unsigned char* value)
+                                           u8 pkt, u8 opt, u8 *val, u8 len)
 {
-        int rc = 0;
-        if (ccid->ccid_ops->ccid_hc_tx_parse_options != NULL)
-                rc = ccid->ccid_ops->ccid_hc_tx_parse_options(sk, option, len, idx,
-                                                    value);
-        return rc;
+        if (ccid->ccid_ops->ccid_hc_tx_parse_options == NULL)
+                return 0;
+        return ccid->ccid_ops->ccid_hc_tx_parse_options(sk, pkt, opt, val, len);
 }
 
+/**
+ * ccid_hc_rx_parse_options  -  Parse CCID-specific options sent by the sender
+ * Arguments are analogous to ccid_hc_tx_parse_options()
+ */
 static inline int ccid_hc_rx_parse_options(struct ccid *ccid, struct sock *sk,
-                                           unsigned char option,
-                                           unsigned char len, u16 idx,
-                                           unsigned char* value)
+                                           u8 pkt, u8 opt, u8 *val, u8 len)
 {
-        int rc = 0;
-        if (ccid->ccid_ops->ccid_hc_rx_parse_options != NULL)
-                rc = ccid->ccid_ops->ccid_hc_rx_parse_options(sk, option, len, idx, value);
-        return rc;
+        if (ccid->ccid_ops->ccid_hc_rx_parse_options == NULL)
+                return 0;
+        return ccid->ccid_ops->ccid_hc_rx_parse_options(sk, pkt, opt, val, len);
 }
 
 static inline int ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk,
diff --git a/net/dccp/ccids/Kconfig b/net/dccp/ccids/Kconfig
index 12275943eab8..fb168be2cb43 100644
--- a/net/dccp/ccids/Kconfig
+++ b/net/dccp/ccids/Kconfig
@@ -1,10 +1,8 @@
 menu "DCCP CCIDs Configuration (EXPERIMENTAL)"
-        depends on EXPERIMENTAL
 
 config IP_DCCP_CCID2
-        tristate "CCID2 (TCP-Like) (EXPERIMENTAL)"
+        tristate "CCID2 (TCP-Like)"
         def_tristate IP_DCCP
-        select IP_DCCP_ACKVEC
         ---help---
           CCID 2, TCP-like Congestion Control, denotes Additive Increase,
           Multiplicative Decrease (AIMD) congestion control with behavior
@@ -36,7 +34,7 @@ config IP_DCCP_CCID2_DEBUG
             If in doubt, say N.
 
 config IP_DCCP_CCID3
-        tristate "CCID3 (TCP-Friendly) (EXPERIMENTAL)"
+        tristate "CCID3 (TCP-Friendly)"
         def_tristate IP_DCCP
         select IP_DCCP_TFRC_LIB
         ---help---
@@ -64,9 +62,9 @@ config IP_DCCP_CCID3
 
           If in doubt, say M.
 
+if IP_DCCP_CCID3
 config IP_DCCP_CCID3_DEBUG
           bool "CCID3 debugging messages"
-          depends on IP_DCCP_CCID3
           ---help---
             Enable CCID3-specific debugging messages.
 
@@ -76,10 +74,29 @@ config IP_DCCP_CCID3_DEBUG
 
             If in doubt, say N.
 
+choice
+          prompt "Select method for measuring the packet size s"
+          default IP_DCCP_CCID3_MEASURE_S_AS_MPS
+
+config IP_DCCP_CCID3_MEASURE_S_AS_MPS
+          bool "Always use MPS in place of s"
+          ---help---
+            This use is recommended as it is consistent with the initialisation
+            of X and suggested when s varies (rfc3448bis, (1) in section 4.1).
+config IP_DCCP_CCID3_MEASURE_S_AS_AVG
+          bool "Use moving average"
+          ---help---
+            An alternative way of tracking s, also supported by rfc3448bis.
+            This used to be the default for CCID-3 in previous kernels.
+config IP_DCCP_CCID3_MEASURE_S_AS_MAX
+          bool "Track the maximum payload length"
+          ---help---
+            An experimental method based on tracking the maximum packet size.
+endchoice
+
 config IP_DCCP_CCID3_RTO
           int "Use higher bound for nofeedback timer"
           default 100
-          depends on IP_DCCP_CCID3 && EXPERIMENTAL
           ---help---
             Use higher lower bound for nofeedback timer expiration.
 
@@ -106,6 +123,7 @@ config IP_DCCP_CCID3_RTO
             The purpose of the nofeedback timer is to slow DCCP down when there
             is serious network congestion: experimenting with larger values should
             therefore not be performed on WANs.
+endif   # IP_DCCP_CCID3
 
 config IP_DCCP_TFRC_LIB
         tristate
diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index 9a430734530c..fa713227c66f 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -25,7 +25,7 @@
 /*
  * This implementation should follow RFC 4341
  */
-
+#include "../feat.h"
 #include "../ccid.h"
 #include "../dccp.h"
 #include "ccid2.h"
@@ -34,51 +34,8 @@
 #ifdef CONFIG_IP_DCCP_CCID2_DEBUG
 static int ccid2_debug;
 #define ccid2_pr_debug(format, a...)    DCCP_PR_DEBUG(ccid2_debug, format, ##a)
-
-static void ccid2_hc_tx_check_sanity(const struct ccid2_hc_tx_sock *hctx)
-{
-        int len = 0;
-        int pipe = 0;
-        struct ccid2_seq *seqp = hctx->ccid2hctx_seqh;
-
-        /* there is data in the chain */
-        if (seqp != hctx->ccid2hctx_seqt) {
-                seqp = seqp->ccid2s_prev;
-                len++;
-                if (!seqp->ccid2s_acked)
-                        pipe++;
-
-                while (seqp != hctx->ccid2hctx_seqt) {
-                        struct ccid2_seq *prev = seqp->ccid2s_prev;
-
-                        len++;
-                        if (!prev->ccid2s_acked)
-                                pipe++;
-
-                        /* packets are sent sequentially */
-                        BUG_ON(dccp_delta_seqno(seqp->ccid2s_seq,
-                                                prev->ccid2s_seq ) >= 0);
-                        BUG_ON(time_before(seqp->ccid2s_sent,
-                                           prev->ccid2s_sent));
-
-                        seqp = prev;
-                }
-        }
-
-        BUG_ON(pipe != hctx->ccid2hctx_pipe);
-        ccid2_pr_debug("len of chain=%d\n", len);
-
-        do {
-                seqp = seqp->ccid2s_prev;
-                len++;
-        } while (seqp != hctx->ccid2hctx_seqh);
-
-        ccid2_pr_debug("total len=%d\n", len);
-        BUG_ON(len != hctx->ccid2hctx_seqbufc * CCID2_SEQBUF_LEN);
-}
 #else
 #define ccid2_pr_debug(format, a...)
-#define ccid2_hc_tx_check_sanity(hctx)
 #endif
 
 static int ccid2_hc_tx_alloc_seq(struct ccid2_hc_tx_sock *hctx)
@@ -87,8 +44,7 @@ static int ccid2_hc_tx_alloc_seq(struct ccid2_hc_tx_sock *hctx)
         int i;
 
         /* check if we have space to preserve the pointer to the buffer */
-        if (hctx->ccid2hctx_seqbufc >= (sizeof(hctx->ccid2hctx_seqbuf) /
-                                        sizeof(struct ccid2_seq*)))
+        if (hctx->seqbufc >= sizeof(hctx->seqbuf) / sizeof(struct ccid2_seq *))
                 return -ENOMEM;
 
         /* allocate buffer and initialize linked list */
@@ -104,38 +60,35 @@ static int ccid2_hc_tx_alloc_seq(struct ccid2_hc_tx_sock *hctx)
         seqp->ccid2s_prev = &seqp[CCID2_SEQBUF_LEN - 1];
 
         /* This is the first allocation.  Initiate the head and tail.  */
-        if (hctx->ccid2hctx_seqbufc == 0)
-                hctx->ccid2hctx_seqh = hctx->ccid2hctx_seqt = seqp;
+        if (hctx->seqbufc == 0)
+                hctx->seqh = hctx->seqt = seqp;
         else {
                 /* link the existing list with the one we just created */
-                hctx->ccid2hctx_seqh->ccid2s_next = seqp;
-                seqp->ccid2s_prev = hctx->ccid2hctx_seqh;
+                hctx->seqh->ccid2s_next = seqp;
+                seqp->ccid2s_prev = hctx->seqh;
 
-                hctx->ccid2hctx_seqt->ccid2s_prev = &seqp[CCID2_SEQBUF_LEN - 1];
-                seqp[CCID2_SEQBUF_LEN - 1].ccid2s_next = hctx->ccid2hctx_seqt;
+                hctx->seqt->ccid2s_prev = &seqp[CCID2_SEQBUF_LEN - 1];
+                seqp[CCID2_SEQBUF_LEN - 1].ccid2s_next = hctx->seqt;
         }
 
         /* store the original pointer to the buffer so we can free it */
-        hctx->ccid2hctx_seqbuf[hctx->ccid2hctx_seqbufc] = seqp;
-        hctx->ccid2hctx_seqbufc++;
+        hctx->seqbuf[hctx->seqbufc] = seqp;
+        hctx->seqbufc++;
 
         return 0;
 }
 
 static int ccid2_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
 {
-        struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
-
-        if (hctx->ccid2hctx_pipe < hctx->ccid2hctx_cwnd)
-                return 0;
-
-        return 1; /* XXX CCID should dequeue when ready instead of polling */
+        if (ccid2_cwnd_network_limited(ccid2_hc_tx_sk(sk)))
+                return CCID_PACKET_WILL_DEQUEUE_LATER;
+        return CCID_PACKET_SEND_AT_ONCE;
 }
 
 static void ccid2_change_l_ack_ratio(struct sock *sk, u32 val)
 {
         struct dccp_sock *dp = dccp_sk(sk);
-        u32 max_ratio = DIV_ROUND_UP(ccid2_hc_tx_sk(sk)->ccid2hctx_cwnd, 2);
+        u32 max_ratio = DIV_ROUND_UP(ccid2_hc_tx_sk(sk)->cwnd, 2);
 
         /*
          * Ensure that Ack Ratio does not exceed ceil(cwnd/2), which is (2) from
@@ -147,8 +100,8 @@ static void ccid2_change_l_ack_ratio(struct sock *sk, u32 val)
                 DCCP_WARN("Limiting Ack Ratio (%u) to %u\n", val, max_ratio);
                 val = max_ratio;
         }
-        if (val > 0xFFFF)               /* RFC 4340, 11.3 */
-                val = 0xFFFF;
+        if (val > DCCPF_ACK_RATIO_MAX)
+                val = DCCPF_ACK_RATIO_MAX;
 
         if (val == dp->dccps_l_ack_ratio)
                 return;
@@ -157,99 +110,77 @@ static void ccid2_change_l_ack_ratio(struct sock *sk, u32 val)
         dp->dccps_l_ack_ratio = val;
 }
 
-static void ccid2_change_srtt(struct ccid2_hc_tx_sock *hctx, long val)
-{
-        ccid2_pr_debug("change SRTT to %ld\n", val);
-        hctx->ccid2hctx_srtt = val;
-}
-
-static void ccid2_start_rto_timer(struct sock *sk);
-
 static void ccid2_hc_tx_rto_expire(unsigned long data)
 {
         struct sock *sk = (struct sock *)data;
         struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
-        long s;
+        const bool sender_was_blocked = ccid2_cwnd_network_limited(hctx);
 
         bh_lock_sock(sk);
         if (sock_owned_by_user(sk)) {
-                sk_reset_timer(sk, &hctx->ccid2hctx_rtotimer,
-                               jiffies + HZ / 5);
+                sk_reset_timer(sk, &hctx->rtotimer, jiffies + HZ / 5);
                 goto out;
         }
 
         ccid2_pr_debug("RTO_EXPIRE\n");
 
-        ccid2_hc_tx_check_sanity(hctx);
-
         /* back-off timer */
-        hctx->ccid2hctx_rto <<= 1;
-
-        s = hctx->ccid2hctx_rto / HZ;
-        if (s > 60)
-                hctx->ccid2hctx_rto = 60 * HZ;
-
-        ccid2_start_rto_timer(sk);
+        hctx->rto <<= 1;
+        if (hctx->rto > DCCP_RTO_MAX)
+                hctx->rto = DCCP_RTO_MAX;
 
         /* adjust pipe, cwnd etc */
-        hctx->ccid2hctx_ssthresh = hctx->ccid2hctx_cwnd / 2;
-        if (hctx->ccid2hctx_ssthresh < 2)
-                hctx->ccid2hctx_ssthresh = 2;
-        hctx->ccid2hctx_cwnd     = 1;
-        hctx->ccid2hctx_pipe     = 0;
+        hctx->ssthresh = hctx->cwnd / 2;
+        if (hctx->ssthresh < 2)
+                hctx->ssthresh = 2;
+        hctx->cwnd = 1;
+        hctx->pipe = 0;
 
         /* clear state about stuff we sent */
-        hctx->ccid2hctx_seqt = hctx->ccid2hctx_seqh;
-        hctx->ccid2hctx_packets_acked = 0;
+        hctx->seqt = hctx->seqh;
+        hctx->packets_acked = 0;
 
         /* clear ack ratio state. */
-        hctx->ccid2hctx_rpseq    = 0;
-        hctx->ccid2hctx_rpdupack = -1;
+        hctx->rpseq    = 0;
+        hctx->rpdupack = -1;
         ccid2_change_l_ack_ratio(sk, 1);
-        ccid2_hc_tx_check_sanity(hctx);
+
+        /* if we were blocked before, we may now send cwnd=1 packet */
+        if (sender_was_blocked)
+                tasklet_schedule(&dccp_sk(sk)->dccps_xmitlet);
+        /* restart backed-off timer */
+        sk_reset_timer(sk, &hctx->rtotimer, jiffies + hctx->rto);
 out:
         bh_unlock_sock(sk);
         sock_put(sk);
 }
 
-static void ccid2_start_rto_timer(struct sock *sk)
-{
-        struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
-
-        ccid2_pr_debug("setting RTO timeout=%ld\n", hctx->ccid2hctx_rto);
-
-        BUG_ON(timer_pending(&hctx->ccid2hctx_rtotimer));
-        sk_reset_timer(sk, &hctx->ccid2hctx_rtotimer,
-                       jiffies + hctx->ccid2hctx_rto);
-}
-
-static void ccid2_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len)
+static void ccid2_hc_tx_packet_sent(struct sock *sk, unsigned int len)
 {
         struct dccp_sock *dp = dccp_sk(sk);
         struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
         struct ccid2_seq *next;
 
-        hctx->ccid2hctx_pipe++;
+        hctx->pipe++;
 
-        hctx->ccid2hctx_seqh->ccid2s_seq   = dp->dccps_gss;
-        hctx->ccid2hctx_seqh->ccid2s_acked = 0;
-        hctx->ccid2hctx_seqh->ccid2s_sent  = jiffies;
+        hctx->seqh->ccid2s_seq   = dp->dccps_gss;
+        hctx->seqh->ccid2s_acked = 0;
+        hctx->seqh->ccid2s_sent  = jiffies;
 
-        next = hctx->ccid2hctx_seqh->ccid2s_next;
+        next = hctx->seqh->ccid2s_next;
         /* check if we need to alloc more space */
-        if (next == hctx->ccid2hctx_seqt) {
+        if (next == hctx->seqt) {
                 if (ccid2_hc_tx_alloc_seq(hctx)) {
                         DCCP_CRIT("packet history - out of memory!");
                         /* FIXME: find a more graceful way to bail out */
                         return;
                 }
-                next = hctx->ccid2hctx_seqh->ccid2s_next;
-                BUG_ON(next == hctx->ccid2hctx_seqt);
+                next = hctx->seqh->ccid2s_next;
+                BUG_ON(next == hctx->seqt);
         }
-        hctx->ccid2hctx_seqh = next;
+        hctx->seqh = next;
 
-        ccid2_pr_debug("cwnd=%d pipe=%d\n", hctx->ccid2hctx_cwnd,
-                       hctx->ccid2hctx_pipe);
+        ccid2_pr_debug("cwnd=%d pipe=%d\n", hctx->cwnd, hctx->pipe);
 
         /*
          * FIXME: The code below is broken and the variables have been removed
@@ -272,12 +203,12 @@ static void ccid2_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len)
          */
 #if 0
         /* Ack Ratio.  Need to maintain a concept of how many windows we sent */
-        hctx->ccid2hctx_arsent++;
+        hctx->arsent++;
         /* We had an ack loss in this window... */
-        if (hctx->ccid2hctx_ackloss) {
-                if (hctx->ccid2hctx_arsent >= hctx->ccid2hctx_cwnd) {
-                        hctx->ccid2hctx_arsent  = 0;
-                        hctx->ccid2hctx_ackloss = 0;
+        if (hctx->ackloss) {
+                if (hctx->arsent >= hctx->cwnd) {
+                        hctx->arsent  = 0;
+                        hctx->ackloss = 0;
                 }
         } else {
                 /* No acks lost up to now... */
@@ -287,28 +218,28 @@ static void ccid2_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len)
                         int denom = dp->dccps_l_ack_ratio * dp->dccps_l_ack_ratio -
                                     dp->dccps_l_ack_ratio;
 
-                        denom = hctx->ccid2hctx_cwnd * hctx->ccid2hctx_cwnd / denom;
+                        denom = hctx->cwnd * hctx->cwnd / denom;
 
-                        if (hctx->ccid2hctx_arsent >= denom) {
+                        if (hctx->arsent >= denom) {
                                 ccid2_change_l_ack_ratio(sk, dp->dccps_l_ack_ratio - 1);
-                                hctx->ccid2hctx_arsent = 0;
+                                hctx->arsent = 0;
                         }
                 } else {
                         /* we can't increase ack ratio further [1] */
-                        hctx->ccid2hctx_arsent = 0; /* or maybe set it to cwnd*/
+                        hctx->arsent = 0; /* or maybe set it to cwnd*/
                 }
         }
 #endif
 
         /* setup RTO timer */
-        if (!timer_pending(&hctx->ccid2hctx_rtotimer))
-                ccid2_start_rto_timer(sk);
+        if (!timer_pending(&hctx->rtotimer))
+                sk_reset_timer(sk, &hctx->rtotimer, jiffies + hctx->rto);
 
 #ifdef CONFIG_IP_DCCP_CCID2_DEBUG
         do {
-                struct ccid2_seq *seqp = hctx->ccid2hctx_seqt;
+                struct ccid2_seq *seqp = hctx->seqt;
 
-                while (seqp != hctx->ccid2hctx_seqh) {
+                while (seqp != hctx->seqh) {
                         ccid2_pr_debug("out seq=%llu acked=%d time=%lu\n",
                                        (unsigned long long)seqp->ccid2s_seq,
                                        seqp->ccid2s_acked, seqp->ccid2s_sent);
@@ -316,205 +247,158 @@ static void ccid2_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len)
                 }
         } while (0);
         ccid2_pr_debug("=========\n");
-        ccid2_hc_tx_check_sanity(hctx);
 #endif
 }
 
-/* XXX Lame code duplication!
- * returns -1 if none was found.
- * else returns the next offset to use in the function call.
+/**
+ * ccid2_rtt_estimator - Sample RTT and compute RTO using RFC2988 algorithm
+ * This code is almost identical with TCP's tcp_rtt_estimator(), since
+ * - it has a higher sampling frequency (recommended by RFC 1323),
+ * - the RTO does not collapse into RTT due to RTTVAR going towards zero,
+ * - it is simple (cf. more complex proposals such as Eifel timer or research
+ *   which suggests that the gain should be set according to window size),
+ * - in tests it was found to work well with CCID2 [gerrit].
  */
-static int ccid2_ackvector(struct sock *sk, struct sk_buff *skb, int offset,
-                           unsigned char **vec, unsigned char *veclen)
+static void ccid2_rtt_estimator(struct sock *sk, const long mrtt)
 {
-        const struct dccp_hdr *dh = dccp_hdr(skb);
-        unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb);
-        unsigned char *opt_ptr;
-        const unsigned char *opt_end = (unsigned char *)dh +
-                                        (dh->dccph_doff * 4);
-        unsigned char opt, len;
-        unsigned char *value;
-
-        BUG_ON(offset < 0);
-        options += offset;
-        opt_ptr = options;
-        if (opt_ptr >= opt_end)
-                return -1;
-
-        while (opt_ptr != opt_end) {
-                opt   = *opt_ptr++;
-                len   = 0;
-                value = NULL;
-
-                /* Check if this isn't a single byte option */
-                if (opt > DCCPO_MAX_RESERVED) {
-                        if (opt_ptr == opt_end)
-                                goto out_invalid_option;
-
-                        len = *opt_ptr++;
-                        if (len < 3)
-                                goto out_invalid_option;
+        struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
+        long m = mrtt ? : 1;
+
+        if (hctx->srtt == 0) {
+                /* First measurement m */
+                hctx->srtt = m << 3;
+                hctx->mdev = m << 1;
+
+                hctx->mdev_max = max(TCP_RTO_MIN, hctx->mdev);
+                hctx->rttvar   = hctx->mdev_max;
+                hctx->rtt_seq  = dccp_sk(sk)->dccps_gss;
+        } else {
+                /* Update scaled SRTT as SRTT += 1/8 * (m - SRTT) */
+                m -= (hctx->srtt >> 3);
+                hctx->srtt += m;
+
+                /* Similarly, update scaled mdev with regard to |m| */
+                if (m < 0) {
+                        m = -m;
+                        m -= (hctx->mdev >> 2);
                         /*
-                         * Remove the type and len fields, leaving
-                         * just the value size
+                         * This neutralises RTO increase when RTT < SRTT - mdev
+                         * (see P. Sarolahti, A. Kuznetsov,"Congestion Control
+                         * in Linux TCP", USENIX 2002, pp. 49-62).
                          */
-                        len     -= 2;
-                        value   = opt_ptr;
-                        opt_ptr += len;
+                        if (m > 0)
+                                m >>= 3;
+                } else {
+                        m -= (hctx->mdev >> 2);
+                }
+                hctx->mdev += m;
 
-                        if (opt_ptr > opt_end)
-                                goto out_invalid_option;
+                if (hctx->mdev > hctx->mdev_max) {
+                        hctx->mdev_max = hctx->mdev;
+                        if (hctx->mdev_max > hctx->rttvar)
+                                hctx->rttvar = hctx->mdev_max;
                 }
 
-                switch (opt) {
-                case DCCPO_ACK_VECTOR_0:
-                case DCCPO_ACK_VECTOR_1:
-                        *vec    = value;
-                        *veclen = len;
-                        return offset + (opt_ptr - options);
+                /*
+                 * Decay RTTVAR at most once per flight, exploiting that
+                 *  1) pipe <= cwnd <= Sequence_Window = W  (RFC 4340, 7.5.2)
+                 *  2) AWL = GSS-W+1 <= GAR <= GSS          (RFC 4340, 7.5.1)
+                 * GAR is a useful bound for FlightSize = pipe, AWL is probably
+                 * too low as it over-estimates pipe.
+                 */
+                if (after48(dccp_sk(sk)->dccps_gar, hctx->rtt_seq)) {
+                        if (hctx->mdev_max < hctx->rttvar)
+                                hctx->rttvar -= (hctx->rttvar -
+                                                 hctx->mdev_max) >> 2;
+                        hctx->rtt_seq  = dccp_sk(sk)->dccps_gss;
+                        hctx->mdev_max = TCP_RTO_MIN;
                 }
         }
 
-        return -1;
-
-out_invalid_option:
-        DCCP_BUG("Invalid option - this should not happen (previous parsing)!");
-        return -1;
-}
-
-static void ccid2_hc_tx_kill_rto_timer(struct sock *sk)
-{
-        struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
+        /*
+         * Set RTO from SRTT and RTTVAR
+         * Clock granularity is ignored since the minimum error for RTTVAR is
+         * clamped to 50msec (corresponding to HZ=20). This leads to a minimum
+         * RTO of 200msec. This agrees with TCP and RFC 4341, 5.: "Because DCCP
+         * does not retransmit data, DCCP does not require TCP's recommended
+         * minimum timeout of one second".
+         */
+        hctx->rto = (hctx->srtt >> 3) + hctx->rttvar;
 
-        sk_stop_timer(sk, &hctx->ccid2hctx_rtotimer);
-        ccid2_pr_debug("deleted RTO timer\n");
+        if (hctx->rto > DCCP_RTO_MAX)
+                hctx->rto = DCCP_RTO_MAX;
 }
 
-static inline void ccid2_new_ack(struct sock *sk,
-                                 struct ccid2_seq *seqp,
-                                 unsigned int *maxincr)
+static void ccid2_new_ack(struct sock *sk, struct ccid2_seq *seqp,
+                          unsigned int *maxincr)
 {
         struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
 
-        if (hctx->ccid2hctx_cwnd < hctx->ccid2hctx_ssthresh) {
-                if (*maxincr > 0 && ++hctx->ccid2hctx_packets_acked == 2) {
-                        hctx->ccid2hctx_cwnd += 1;
-                        *maxincr             -= 1;
-                        hctx->ccid2hctx_packets_acked = 0;
+        if (hctx->cwnd < hctx->ssthresh) {
+                if (*maxincr > 0 && ++hctx->packets_acked == 2) {
+                        hctx->cwnd += 1;
+                        *maxincr   -= 1;
+                        hctx->packets_acked = 0;
                 }
-        } else if (++hctx->ccid2hctx_packets_acked >= hctx->ccid2hctx_cwnd) {
-                        hctx->ccid2hctx_cwnd += 1;
-                        hctx->ccid2hctx_packets_acked = 0;
+        } else if (++hctx->packets_acked >= hctx->cwnd) {
+                        hctx->cwnd += 1;
+                        hctx->packets_acked = 0;
         }
-
-        /* update RTO */
-        if (hctx->ccid2hctx_srtt == -1 ||
-            time_after(jiffies, hctx->ccid2hctx_lastrtt + hctx->ccid2hctx_srtt)) {
-                unsigned long r = (long)jiffies - (long)seqp->ccid2s_sent;
-                int s;
-
-                /* first measurement */
-                if (hctx->ccid2hctx_srtt == -1) {
-                        ccid2_pr_debug("R: %lu Time=%lu seq=%llu\n",
-                                       r, jiffies,
-                                       (unsigned long long)seqp->ccid2s_seq);
-                        ccid2_change_srtt(hctx, r);
-                        hctx->ccid2hctx_rttvar = r >> 1;
-                } else {
-                        /* RTTVAR */
-                        long tmp = hctx->ccid2hctx_srtt - r;
-                        long srtt;
-
-                        if (tmp < 0)
-                                tmp *= -1;
-
-                        tmp >>= 2;
-                        hctx->ccid2hctx_rttvar *= 3;
-                        hctx->ccid2hctx_rttvar >>= 2;
-                        hctx->ccid2hctx_rttvar += tmp;
-
-                        /* SRTT */
-                        srtt = hctx->ccid2hctx_srtt;
-                        srtt *= 7;
-                        srtt >>= 3;
-                        tmp = r >> 3;
-                        srtt += tmp;
-                        ccid2_change_srtt(hctx, srtt);
-                }
-                s = hctx->ccid2hctx_rttvar << 2;
-                /* clock granularity is 1 when based on jiffies */
-                if (!s)
-                        s = 1;
-                hctx->ccid2hctx_rto = hctx->ccid2hctx_srtt + s;
-
-                /* must be at least a second */
-                s = hctx->ccid2hctx_rto / HZ;
-                /* DCCP doesn't require this [but I like it cuz my code sux] */
-#if 1
-                if (s < 1)
-                        hctx->ccid2hctx_rto = HZ;
-#endif
-                /* max 60 seconds */
-                if (s > 60)
-                        hctx->ccid2hctx_rto = HZ * 60;
-
-                hctx->ccid2hctx_lastrtt = jiffies;
-
-                ccid2_pr_debug("srtt: %ld rttvar: %ld rto: %ld (HZ=%d) R=%lu\n",
-                               hctx->ccid2hctx_srtt, hctx->ccid2hctx_rttvar,
-                               hctx->ccid2hctx_rto, HZ, r);
-        }
-
-        /* we got a new ack, so re-start RTO timer */
-        ccid2_hc_tx_kill_rto_timer(sk);
-        ccid2_start_rto_timer(sk);
-}
-
-static void ccid2_hc_tx_dec_pipe(struct sock *sk)
-{
-        struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
-
-        if (hctx->ccid2hctx_pipe == 0)
-                DCCP_BUG("pipe == 0");
-        else
-                hctx->ccid2hctx_pipe--;
-
-        if (hctx->ccid2hctx_pipe == 0)
-                ccid2_hc_tx_kill_rto_timer(sk);
+        /*
+         * FIXME: RTT is sampled several times per acknowledgment (for each
+         * entry in the Ack Vector), instead of once per Ack (as in TCP SACK).
+         * This causes the RTT to be over-estimated, since the older entries
+         * in the Ack Vector have earlier sending times.
+         * The cleanest solution is to not use the ccid2s_sent field at all
+         * and instead use DCCP timestamps - need to be resolved at some time.
+         */
+        ccid2_rtt_estimator(sk, jiffies - seqp->ccid2s_sent);
 }
 
 static void ccid2_congestion_event(struct sock *sk, struct ccid2_seq *seqp)
 {
         struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
 
-        if (time_before(seqp->ccid2s_sent, hctx->ccid2hctx_last_cong)) {
+        if (time_before(seqp->ccid2s_sent, hctx->last_cong)) {
                 ccid2_pr_debug("Multiple losses in an RTT---treating as one\n");
                 return;
         }
 
-        hctx->ccid2hctx_last_cong = jiffies;
+        hctx->last_cong = jiffies;
 
-        hctx->ccid2hctx_cwnd     = hctx->ccid2hctx_cwnd / 2 ? : 1U;
-        hctx->ccid2hctx_ssthresh = max(hctx->ccid2hctx_cwnd, 2U);
+        hctx->cwnd     = hctx->cwnd / 2 ? : 1U;
+        hctx->ssthresh = max(hctx->cwnd, 2U);
 
         /* Avoid spurious timeouts resulting from Ack Ratio > cwnd */
-        if (dccp_sk(sk)->dccps_l_ack_ratio > hctx->ccid2hctx_cwnd)
-                ccid2_change_l_ack_ratio(sk, hctx->ccid2hctx_cwnd);
+        if (dccp_sk(sk)->dccps_l_ack_ratio > hctx->cwnd)
+                ccid2_change_l_ack_ratio(sk, hctx->cwnd);
+}
+
+static int ccid2_hc_tx_parse_options(struct sock *sk, u8 packet_type,
+                                     u8 option, u8 *optval, u8 optlen)
+{
+        struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
+
+        switch (option) {
+        case DCCPO_ACK_VECTOR_0:
+        case DCCPO_ACK_VECTOR_1:
+                return dccp_ackvec_parsed_add(&hctx->av_chunks, optval, optlen,
+                                              option - DCCPO_ACK_VECTOR_0);
+        }
+        return 0;
 }
 
 static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
 {
         struct dccp_sock *dp = dccp_sk(sk);
         struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
+        const bool sender_was_blocked = ccid2_cwnd_network_limited(hctx);
+        struct dccp_ackvec_parsed *avp;
         u64 ackno, seqno;
         struct ccid2_seq *seqp;
-        unsigned char *vector;
-        unsigned char veclen;
-        int offset = 0;
         int done = 0;
         unsigned int maxincr = 0;
 
-        ccid2_hc_tx_check_sanity(hctx);
         /* check reverse path congestion */
         seqno = DCCP_SKB_CB(skb)->dccpd_seq;
 
@@ -523,21 +407,21 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
          * -sorbo.
          */
         /* need to bootstrap */
-        if (hctx->ccid2hctx_rpdupack == -1) {
-                hctx->ccid2hctx_rpdupack = 0;
-                hctx->ccid2hctx_rpseq = seqno;
+        if (hctx->rpdupack == -1) {
+                hctx->rpdupack = 0;
+                hctx->rpseq = seqno;
         } else {
                 /* check if packet is consecutive */
-                if (dccp_delta_seqno(hctx->ccid2hctx_rpseq, seqno) == 1)
-                        hctx->ccid2hctx_rpseq = seqno;
+                if (dccp_delta_seqno(hctx->rpseq, seqno) == 1)
+                        hctx->rpseq = seqno;
                 /* it's a later packet */
-                else if (after48(seqno, hctx->ccid2hctx_rpseq)) {
-                        hctx->ccid2hctx_rpdupack++;
+                else if (after48(seqno, hctx->rpseq)) {
+                        hctx->rpdupack++;
 
                         /* check if we got enough dupacks */
-                        if (hctx->ccid2hctx_rpdupack >= NUMDUPACK) {
-                                hctx->ccid2hctx_rpdupack = -1; /* XXX lame */
-                                hctx->ccid2hctx_rpseq = 0;
+                        if (hctx->rpdupack >= NUMDUPACK) {
+                                hctx->rpdupack = -1; /* XXX lame */
+                                hctx->rpseq = 0;
 
                                 ccid2_change_l_ack_ratio(sk, 2 * dp->dccps_l_ack_ratio);
                         }
@@ -545,27 +429,22 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
         }
 
         /* check forward path congestion */
-        /* still didn't send out new data packets */
-        if (hctx->ccid2hctx_seqh == hctx->ccid2hctx_seqt)
+        if (dccp_packet_without_ack(skb))
                 return;
 
-        switch (DCCP_SKB_CB(skb)->dccpd_type) {
-        case DCCP_PKT_ACK:
-        case DCCP_PKT_DATAACK:
-                break;
-        default:
-                return;
-        }
+        /* still didn't send out new data packets */
+        if (hctx->seqh == hctx->seqt)
+                goto done;
 
         ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq;
-        if (after48(ackno, hctx->ccid2hctx_high_ack))
-                hctx->ccid2hctx_high_ack = ackno;
+        if (after48(ackno, hctx->high_ack))
+                hctx->high_ack = ackno;
 
-        seqp = hctx->ccid2hctx_seqt;
+        seqp = hctx->seqt;
         while (before48(seqp->ccid2s_seq, ackno)) {
                 seqp = seqp->ccid2s_next;
-                if (seqp == hctx->ccid2hctx_seqh) {
-                        seqp = hctx->ccid2hctx_seqh->ccid2s_prev;
+                if (seqp == hctx->seqh) {
+                        seqp = hctx->seqh->ccid2s_prev;
                         break;
                 }
         }
@@ -575,26 +454,26 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
          * packets per acknowledgement. Rounding up avoids that cwnd is not
          * advanced when Ack Ratio is 1 and gives a slight edge otherwise.
          */
-        if (hctx->ccid2hctx_cwnd < hctx->ccid2hctx_ssthresh)
+        if (hctx->cwnd < hctx->ssthresh)
                 maxincr = DIV_ROUND_UP(dp->dccps_l_ack_ratio, 2);
 
         /* go through all ack vectors */
-        while ((offset = ccid2_ackvector(sk, skb, offset,
-                                         &vector, &veclen)) != -1) {
+        list_for_each_entry(avp, &hctx->av_chunks, node) {
                 /* go through this ack vector */
-                while (veclen--) {
-                        const u8 rl = *vector & DCCP_ACKVEC_LEN_MASK;
-                        u64 ackno_end_rl = SUB48(ackno, rl);
+                for (; avp->len--; avp->vec++) {
+                        u64 ackno_end_rl = SUB48(ackno,
+                                                 dccp_ackvec_runlen(avp->vec));
 
-                        ccid2_pr_debug("ackvec start:%llu end:%llu\n",
+                        ccid2_pr_debug("ackvec %llu |%u,%u|\n",
                                        (unsigned long long)ackno,
-                                       (unsigned long long)ackno_end_rl);
+                                       dccp_ackvec_state(avp->vec) >> 6,
+                                       dccp_ackvec_runlen(avp->vec));
                         /* if the seqno we are analyzing is larger than the
                          * current ackno, then move towards the tail of our
                          * seqnos.
                          */
                         while (after48(seqp->ccid2s_seq, ackno)) {
-                                if (seqp == hctx->ccid2hctx_seqt) {
+                                if (seqp == hctx->seqt) {
                                         done = 1;
                                         break;
                                 }
@@ -607,26 +486,24 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
                          * run length
                          */
                         while (between48(seqp->ccid2s_seq,ackno_end_rl,ackno)) {
-                                const u8 state = *vector &
-                                                 DCCP_ACKVEC_STATE_MASK;
+                                const u8 state = dccp_ackvec_state(avp->vec);
 
                                 /* new packet received or marked */
-                                if (state != DCCP_ACKVEC_STATE_NOT_RECEIVED &&
+                                if (state != DCCPAV_NOT_RECEIVED &&
                                     !seqp->ccid2s_acked) {
-                                        if (state ==
-                                            DCCP_ACKVEC_STATE_ECN_MARKED) {
+                                        if (state == DCCPAV_ECN_MARKED)
                                                 ccid2_congestion_event(sk,
                                                                        seqp);
-                                        } else
+                                        else
                                                 ccid2_new_ack(sk, seqp,
                                                               &maxincr);
 
                                         seqp->ccid2s_acked = 1;
                                         ccid2_pr_debug("Got ack for %llu\n",
                                                        (unsigned long long)seqp->ccid2s_seq);
-                                        ccid2_hc_tx_dec_pipe(sk);
+                                        hctx->pipe--;
                                 }
-                                if (seqp == hctx->ccid2hctx_seqt) {
+                                if (seqp == hctx->seqt) {
                                         done = 1;
                                         break;
                                 }
@@ -636,7 +513,6 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
                                 break;
 
                         ackno = SUB48(ackno_end_rl, 1);
-                        vector++;
                 }
                 if (done)
                         break;
@@ -645,11 +521,11 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
         /* The state about what is acked should be correct now
          * Check for NUMDUPACK
          */
-        seqp = hctx->ccid2hctx_seqt;
-        while (before48(seqp->ccid2s_seq, hctx->ccid2hctx_high_ack)) {
+        seqp = hctx->seqt;
+        while (before48(seqp->ccid2s_seq, hctx->high_ack)) {
                 seqp = seqp->ccid2s_next;
-                if (seqp == hctx->ccid2hctx_seqh) {
-                        seqp = hctx->ccid2hctx_seqh->ccid2s_prev;
+                if (seqp == hctx->seqh) {
+                        seqp = hctx->seqh->ccid2s_prev;
                         break;
                 }
         }
@@ -660,7 +536,7 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
                         if (done == NUMDUPACK)
                                 break;
                 }
-                if (seqp == hctx->ccid2hctx_seqt)
+                if (seqp == hctx->seqt)
                         break;
                 seqp = seqp->ccid2s_prev;
         }
@@ -681,25 +557,34 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
                                  * one ack vector.
                                  */
                                 ccid2_congestion_event(sk, seqp);
-                                ccid2_hc_tx_dec_pipe(sk);
+                                hctx->pipe--;
                         }
-                        if (seqp == hctx->ccid2hctx_seqt)
+                        if (seqp == hctx->seqt)
                                 break;
                         seqp = seqp->ccid2s_prev;
                 }
 
-                hctx->ccid2hctx_seqt = last_acked;
+                hctx->seqt = last_acked;
         }
 
         /* trim acked packets in tail */
-        while (hctx->ccid2hctx_seqt != hctx->ccid2hctx_seqh) {
-                if (!hctx->ccid2hctx_seqt->ccid2s_acked)
+        while (hctx->seqt != hctx->seqh) {
+                if (!hctx->seqt->ccid2s_acked)
                         break;
 
-                hctx->ccid2hctx_seqt = hctx->ccid2hctx_seqt->ccid2s_next;
+                hctx->seqt = hctx->seqt->ccid2s_next;
         }
 
-        ccid2_hc_tx_check_sanity(hctx);
+        /* restart RTO timer if not all outstanding data has been acked */
+        if (hctx->pipe == 0)
+                sk_stop_timer(sk, &hctx->rtotimer);
+        else
+                sk_reset_timer(sk, &hctx->rtotimer, jiffies + hctx->rto);
+done:
+        /* check if incoming Acks allow pending packets to be sent */
+        if (sender_was_blocked && !ccid2_cwnd_network_limited(hctx))
+                tasklet_schedule(&dccp_sk(sk)->dccps_xmitlet);
+        dccp_ackvec_parsed_cleanup(&hctx->av_chunks);
 }
 
 static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)
@@ -709,17 +594,13 @@ static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)
         u32 max_ratio;
 
         /* RFC 4341, 5: initialise ssthresh to arbitrarily high (max) value */
-        hctx->ccid2hctx_ssthresh  = ~0U;
+        hctx->ssthresh = ~0U;
 
-        /*
-         * RFC 4341, 5: "The cwnd parameter is initialized to at most four
-         * packets for new connections, following the rules from [RFC3390]".
-         * We need to convert the bytes of RFC3390 into the packets of RFC 4341.
-         */
-        hctx->ccid2hctx_cwnd = clamp(4380U / dp->dccps_mss_cache, 2U, 4U);
+        /* Use larger initial windows (RFC 3390, rfc2581bis) */
+        hctx->cwnd = rfc3390_bytes_to_packets(dp->dccps_mss_cache);
 
         /* Make sure that Ack Ratio is enabled and within bounds. */
-        max_ratio = DIV_ROUND_UP(hctx->ccid2hctx_cwnd, 2);
+        max_ratio = DIV_ROUND_UP(hctx->cwnd, 2);
         if (dp->dccps_l_ack_ratio == 0 || dp->dccps_l_ack_ratio > max_ratio)
                 dp->dccps_l_ack_ratio = max_ratio;
 
@@ -727,15 +608,11 @@ static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)
         if (ccid2_hc_tx_alloc_seq(hctx))
                 return -ENOMEM;
 
-        hctx->ccid2hctx_rto      = 3 * HZ;
-        ccid2_change_srtt(hctx, -1);
-        hctx->ccid2hctx_rttvar   = -1;
-        hctx->ccid2hctx_rpdupack = -1;
-        hctx->ccid2hctx_last_cong = jiffies;
-        setup_timer(&hctx->ccid2hctx_rtotimer, ccid2_hc_tx_rto_expire,
-                        (unsigned long)sk);
-
-        ccid2_hc_tx_check_sanity(hctx);
+        hctx->rto       = DCCP_TIMEOUT_INIT;
+        hctx->rpdupack  = -1;
+        hctx->last_cong = jiffies;
+        setup_timer(&hctx->rtotimer, ccid2_hc_tx_rto_expire, (unsigned long)sk);
+        INIT_LIST_HEAD(&hctx->av_chunks);
         return 0;
 }
 
@@ -744,11 +621,11 @@ static void ccid2_hc_tx_exit(struct sock *sk)
         struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
         int i;
 
-        ccid2_hc_tx_kill_rto_timer(sk);
+        sk_stop_timer(sk, &hctx->rtotimer);
 
-        for (i = 0; i < hctx->ccid2hctx_seqbufc; i++)
-                kfree(hctx->ccid2hctx_seqbuf[i]);
-        hctx->ccid2hctx_seqbufc = 0;
+        for (i = 0; i < hctx->seqbufc; i++)
+                kfree(hctx->seqbuf[i]);
+        hctx->seqbufc = 0;
 }
 
 static void ccid2_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
@@ -759,27 +636,28 @@ static void ccid2_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
         switch (DCCP_SKB_CB(skb)->dccpd_type) {
         case DCCP_PKT_DATA:
         case DCCP_PKT_DATAACK:
-                hcrx->ccid2hcrx_data++;
-                if (hcrx->ccid2hcrx_data >= dp->dccps_r_ack_ratio) {
+                hcrx->data++;
+                if (hcrx->data >= dp->dccps_r_ack_ratio) {
                         dccp_send_ack(sk);
-                        hcrx->ccid2hcrx_data = 0;
+                        hcrx->data = 0;
                 }
                 break;
         }
 }
 
 static struct ccid_operations ccid2 = {
-        .ccid_id                = DCCPC_CCID2,
-        .ccid_name              = "TCP-like",
-        .ccid_owner             = THIS_MODULE,
-        .ccid_hc_tx_obj_size    = sizeof(struct ccid2_hc_tx_sock),
-        .ccid_hc_tx_init        = ccid2_hc_tx_init,
-        .ccid_hc_tx_exit        = ccid2_hc_tx_exit,
-        .ccid_hc_tx_send_packet = ccid2_hc_tx_send_packet,
-        .ccid_hc_tx_packet_sent = ccid2_hc_tx_packet_sent,
-        .ccid_hc_tx_packet_recv = ccid2_hc_tx_packet_recv,
-        .ccid_hc_rx_obj_size    = sizeof(struct ccid2_hc_rx_sock),
-        .ccid_hc_rx_packet_recv = ccid2_hc_rx_packet_recv,
+        .ccid_id                  = DCCPC_CCID2,
+        .ccid_name                = "TCP-like",
+        .ccid_owner               = THIS_MODULE,
+        .ccid_hc_tx_obj_size      = sizeof(struct ccid2_hc_tx_sock),
+        .ccid_hc_tx_init          = ccid2_hc_tx_init,
+        .ccid_hc_tx_exit          = ccid2_hc_tx_exit,
+        .ccid_hc_tx_send_packet   = ccid2_hc_tx_send_packet,
+        .ccid_hc_tx_packet_sent   = ccid2_hc_tx_packet_sent,
+        .ccid_hc_tx_parse_options = ccid2_hc_tx_parse_options,
+        .ccid_hc_tx_packet_recv   = ccid2_hc_tx_packet_recv,
+        .ccid_hc_rx_obj_size      = sizeof(struct ccid2_hc_rx_sock),
+        .ccid_hc_rx_packet_recv   = ccid2_hc_rx_packet_recv,
 };
 
 #ifdef CONFIG_IP_DCCP_CCID2_DEBUG
diff --git a/net/dccp/ccids/ccid2.h b/net/dccp/ccids/ccid2.h
index 2c94ca029010..8b7a2dee2f6d 100644
--- a/net/dccp/ccids/ccid2.h
+++ b/net/dccp/ccids/ccid2.h
@@ -42,34 +42,49 @@ struct ccid2_seq {
 
 /** struct ccid2_hc_tx_sock - CCID2 TX half connection
  *
- * @ccid2hctx_{cwnd,ssthresh,pipe}: as per RFC 4341, section 5
- * @ccid2hctx_packets_acked - Ack counter for deriving cwnd growth (RFC 3465)
- * @ccid2hctx_lastrtt -time RTT was last measured
- * @ccid2hctx_rpseq - last consecutive seqno
- * @ccid2hctx_rpdupack - dupacks since rpseq
-*/
+ * @{cwnd,ssthresh,pipe}: as per RFC 4341, section 5
+ * @packets_acked: Ack counter for deriving cwnd growth (RFC 3465)
+ * @srtt: smoothed RTT estimate, scaled by 2^3
+ * @mdev: smoothed RTT variation, scaled by 2^2
+ * @mdev_max: maximum of @mdev during one flight
+ * @rttvar: moving average/maximum of @mdev_max
+ * @rto: RTO value deriving from SRTT and RTTVAR (RFC 2988)
+ * @rtt_seq: to decay RTTVAR at most once per flight
+ * @rpseq: last consecutive seqno
+ * @rpdupack: dupacks since rpseq
+ * @av_chunks: list of Ack Vectors received on current skb
+ */
 struct ccid2_hc_tx_sock {
-        u32                     ccid2hctx_cwnd;
-        u32                     ccid2hctx_ssthresh;
-        u32                     ccid2hctx_pipe;
-        u32                     ccid2hctx_packets_acked;
-        struct ccid2_seq        *ccid2hctx_seqbuf[CCID2_SEQBUF_MAX];
-        int                     ccid2hctx_seqbufc;
-        struct ccid2_seq        *ccid2hctx_seqh;
-        struct ccid2_seq        *ccid2hctx_seqt;
-        long                    ccid2hctx_rto;
-        long                    ccid2hctx_srtt;
-        long                    ccid2hctx_rttvar;
-        unsigned long           ccid2hctx_lastrtt;
-        struct timer_list       ccid2hctx_rtotimer;
-        u64                     ccid2hctx_rpseq;
-        int                     ccid2hctx_rpdupack;
-        unsigned long           ccid2hctx_last_cong;
-        u64                     ccid2hctx_high_ack;
+        u32                     cwnd;
+        u32                     ssthresh;
+        u32                     pipe;
+        u32                     packets_acked;
+        struct ccid2_seq        *seqbuf[CCID2_SEQBUF_MAX];
+        int                     seqbufc;
+        struct ccid2_seq        *seqh;
+        struct ccid2_seq        *seqt;
+        /* RTT measurement: variables/principles are the same as in TCP */
+        u32                     srtt,
+                                mdev,
+                                mdev_max,
+                                rttvar,
+                                rto;
+        u64                     rtt_seq:48;
+        struct timer_list       rtotimer;
+        u64                     rpseq;
+        int                     rpdupack;
+        unsigned long           last_cong;
+        u64                     high_ack;
+        struct list_head        av_chunks;
 };
 
+static inline bool ccid2_cwnd_network_limited(struct ccid2_hc_tx_sock *hctx)
+{
+        return (hctx->pipe >= hctx->cwnd);
+}
+
 struct ccid2_hc_rx_sock {
-        int     ccid2hcrx_data;
+        int                     data;
 };
 
 static inline struct ccid2_hc_tx_sock *ccid2_hc_tx_sk(const struct sock *sk)
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index 3b8bd7ca6761..06cfdad84a6a 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -49,75 +49,41 @@ static int ccid3_debug;
 /*
  *      Transmitter Half-Connection Routines
  */
-#ifdef CONFIG_IP_DCCP_CCID3_DEBUG
-static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state)
-{
-        static char *ccid3_state_names[] = {
-        [TFRC_SSTATE_NO_SENT]  = "NO_SENT",
-        [TFRC_SSTATE_NO_FBACK] = "NO_FBACK",
-        [TFRC_SSTATE_FBACK]    = "FBACK",
-        [TFRC_SSTATE_TERM]     = "TERM",
-        };
-
-        return ccid3_state_names[state];
-}
-#endif
-
-static void ccid3_hc_tx_set_state(struct sock *sk,
-                                  enum ccid3_hc_tx_states state)
-{
-        struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
-        enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state;
-
-        ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
-                       dccp_role(sk), sk, ccid3_tx_state_name(oldstate),
-                       ccid3_tx_state_name(state));
-        WARN_ON(state == oldstate);
-        hctx->ccid3hctx_state = state;
-}
+/* Oscillation Prevention/Reduction: recommended by rfc3448bis, on by default */
+static int do_osc_prev = true;
 
 /*
  * Compute the initial sending rate X_init in the manner of RFC 3390:
  *
- *      X_init  =  min(4 * s, max(2 * s, 4380 bytes)) / RTT
+ *      X_init  =  min(4 * MPS, max(2 * MPS, 4380 bytes)) / RTT
  *
- * Note that RFC 3390 uses MSS, RFC 4342 refers to RFC 3390, and rfc3448bis
- * (rev-02) clarifies the use of RFC 3390 with regard to the above formula.
  * For consistency with other parts of the code, X_init is scaled by 2^6.
  */
 static inline u64 rfc3390_initial_rate(struct sock *sk)
 {
-        const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
-        const __u32 w_init = clamp_t(__u32, 4380U,
-                        2 * hctx->ccid3hctx_s, 4 * hctx->ccid3hctx_s);
+        const u32 mps = dccp_sk(sk)->dccps_mss_cache,
+               w_init = clamp(4380U, 2 * mps, 4 * mps);
 
-        return scaled_div(w_init << 6, hctx->ccid3hctx_rtt);
+        return scaled_div(w_init << 6, ccid3_hc_tx_sk(sk)->rtt);
 }
 
-/*
- * Recalculate t_ipi and delta (should be called whenever X changes)
+/**
+ * ccid3_update_send_interval  -  Calculate new t_ipi = s / X
+ * This respects the granularity of X (64 * bytes/second) and enforces the
+ * scaled minimum of s * 64 / t_mbi = `s' bytes/second as per RFC 3448/4342.
  */
 static void ccid3_update_send_interval(struct ccid3_hc_tx_sock *hctx)
 {
-        /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */
-        hctx->ccid3hctx_t_ipi = scaled_div32(((u64)hctx->ccid3hctx_s) << 6,
-                                             hctx->ccid3hctx_x);
-
-        /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */
-        hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2,
-                                           TFRC_OPSYS_HALF_TIME_GRAN);
-
-        ccid3_pr_debug("t_ipi=%u, delta=%u, s=%u, X=%u\n",
-                       hctx->ccid3hctx_t_ipi, hctx->ccid3hctx_delta,
-                       hctx->ccid3hctx_s, (unsigned)(hctx->ccid3hctx_x >> 6));
-
+        if (unlikely(hctx->x <= hctx->s))
+                hctx->x = hctx->s;
+        hctx->t_ipi = scaled_div32(((u64)hctx->s) << 6, hctx->x);
 }
 
 static u32 ccid3_hc_tx_idle_rtt(struct ccid3_hc_tx_sock *hctx, ktime_t now)
 {
-        u32 delta = ktime_us_delta(now, hctx->ccid3hctx_t_last_win_count);
+        u32 delta = ktime_us_delta(now, hctx->t_last_win_count);
 
-        return delta / hctx->ccid3hctx_rtt;
+        return delta / hctx->rtt;
 }
 
 /**
@@ -133,8 +99,8 @@ static u32 ccid3_hc_tx_idle_rtt(struct ccid3_hc_tx_sock *hctx, ktime_t now)
 static void ccid3_hc_tx_update_x(struct sock *sk, ktime_t *stamp)
 {
         struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
-        __u64 min_rate = 2 * hctx->ccid3hctx_x_recv;
-        const  __u64 old_x = hctx->ccid3hctx_x;
+        u64 min_rate = 2 * hctx->x_recv;
+        const u64 old_x = hctx->x;
         ktime_t now = stamp ? *stamp : ktime_get_real();
 
         /*
@@ -145,50 +111,44 @@ static void ccid3_hc_tx_update_x(struct sock *sk, ktime_t *stamp)
          */
         if (ccid3_hc_tx_idle_rtt(hctx, now) >= 2) {
                 min_rate = rfc3390_initial_rate(sk);
-                min_rate = max(min_rate, 2 * hctx->ccid3hctx_x_recv);
+                min_rate = max(min_rate, 2 * hctx->x_recv);
         }
 
-        if (hctx->ccid3hctx_p > 0) {
+        if (hctx->p > 0) {
 
-                hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6,
-                                        min_rate);
-                hctx->ccid3hctx_x = max(hctx->ccid3hctx_x,
-                                        (((__u64)hctx->ccid3hctx_s) << 6) /
-                                                                TFRC_T_MBI);
+                hctx->x = min(((u64)hctx->x_calc) << 6, min_rate);
 
-        } else if (ktime_us_delta(now, hctx->ccid3hctx_t_ld)
-                                - (s64)hctx->ccid3hctx_rtt >= 0) {
+        } else if (ktime_us_delta(now, hctx->t_ld) - (s64)hctx->rtt >= 0) {
 
-                hctx->ccid3hctx_x = min(2 * hctx->ccid3hctx_x, min_rate);
-                hctx->ccid3hctx_x = max(hctx->ccid3hctx_x,
-                            scaled_div(((__u64)hctx->ccid3hctx_s) << 6,
-                                       hctx->ccid3hctx_rtt));
-                hctx->ccid3hctx_t_ld = now;
+                hctx->x = min(2 * hctx->x, min_rate);
+                hctx->x = max(hctx->x,
+                              scaled_div(((u64)hctx->s) << 6, hctx->rtt));
+                hctx->t_ld = now;
         }
 
-        if (hctx->ccid3hctx_x != old_x) {
+        if (hctx->x != old_x) {
                 ccid3_pr_debug("X_prev=%u, X_now=%u, X_calc=%u, "
                                "X_recv=%u\n", (unsigned)(old_x >> 6),
-                               (unsigned)(hctx->ccid3hctx_x >> 6),
-                               hctx->ccid3hctx_x_calc,
-                               (unsigned)(hctx->ccid3hctx_x_recv >> 6));
+                               (unsigned)(hctx->x >> 6), hctx->x_calc,
+                               (unsigned)(hctx->x_recv >> 6));
 
                 ccid3_update_send_interval(hctx);
         }
 }
 
 /*
- *      Track the mean packet size `s' (cf. RFC 4342, 5.3 and  RFC 3448, 4.1)
- *      @len: DCCP packet payload size in bytes
+ * ccid3_hc_tx_measure_packet_size  -  Measuring the packet size `s' (sec 4.1)
+ * @new_len: DCCP payload size in bytes (not used by all methods)
  */
-static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len)
+static u32 ccid3_hc_tx_measure_packet_size(struct sock *sk, const u16 new_len)
 {
-        const u16 old_s = hctx->ccid3hctx_s;
-
-        hctx->ccid3hctx_s = tfrc_ewma(hctx->ccid3hctx_s, len, 9);
-
-        if (hctx->ccid3hctx_s != old_s)
-                ccid3_update_send_interval(hctx);
+#if   defined(CONFIG_IP_DCCP_CCID3_MEASURE_S_AS_AVG)
+        return tfrc_ewma(ccid3_hc_tx_sk(sk)->s, new_len, 9);
+#elif defined(CONFIG_IP_DCCP_CCID3_MEASURE_S_AS_MAX)
+        return max(ccid3_hc_tx_sk(sk)->s, new_len);
+#else /* CONFIG_IP_DCCP_CCID3_MEASURE_S_AS_MPS  */
+        return dccp_sk(sk)->dccps_mss_cache;
+#endif
 }
 
 /*
@@ -198,13 +158,13 @@ static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len)
 static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx,
                                                 ktime_t now)
 {
-        u32 delta = ktime_us_delta(now, hctx->ccid3hctx_t_last_win_count),
-            quarter_rtts = (4 * delta) / hctx->ccid3hctx_rtt;
+        u32 delta = ktime_us_delta(now, hctx->t_last_win_count),
+            quarter_rtts = (4 * delta) / hctx->rtt;
 
         if (quarter_rtts > 0) {
-                hctx->ccid3hctx_t_last_win_count = now;
-                hctx->ccid3hctx_last_win_count  += min(quarter_rtts, 5U);
-                hctx->ccid3hctx_last_win_count  &= 0xF;         /* mod 16 */
+                hctx->t_last_win_count = now;
+                hctx->last_win_count  += min(quarter_rtts, 5U);
+                hctx->last_win_count  &= 0xF;           /* mod 16 */
         }
 }
 
@@ -221,25 +181,26 @@ static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
                 goto restart_timer;
         }
 
-        ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk,
-                       ccid3_tx_state_name(hctx->ccid3hctx_state));
+        ccid3_pr_debug("%s(%p) entry with%s feedback\n", dccp_role(sk), sk,
+                       hctx->feedback ? "" : "out");
 
-        if (hctx->ccid3hctx_state == TFRC_SSTATE_FBACK)
-                ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK);
-        else if (hctx->ccid3hctx_state != TFRC_SSTATE_NO_FBACK)
+        /* Ignore and do not restart after leaving the established state */
+        if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN))
                 goto out;
 
+        /* Reset feedback state to "no feedback received" */
+        hctx->feedback = false;
+
         /*
          * Determine new allowed sending rate X as per draft rfc3448bis-00, 4.4
+         * RTO is 0 if and only if no feedback has been received yet.
          */
-        if (hctx->ccid3hctx_t_rto == 0 ||       /* no feedback received yet */
-            hctx->ccid3hctx_p == 0) {
+        if (hctx->t_rto == 0 || hctx->p == 0) {
 
                 /* halve send rate directly */
-                hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2,
-                                        (((__u64)hctx->ccid3hctx_s) << 6) /
-                                                                    TFRC_T_MBI);
+                hctx->x /= 2;
                 ccid3_update_send_interval(hctx);
+
         } else {
                 /*
                  *  Modify the cached value of X_recv
@@ -251,44 +212,41 @@ static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
                  *
                  *  Note that X_recv is scaled by 2^6 while X_calc is not
                  */
-                BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc);
+                BUG_ON(hctx->p && !hctx->x_calc);
 
-                if (hctx->ccid3hctx_x_calc > (hctx->ccid3hctx_x_recv >> 5))
-                        hctx->ccid3hctx_x_recv =
-                                max(hctx->ccid3hctx_x_recv / 2,
-                                    (((__u64)hctx->ccid3hctx_s) << 6) /
-                                                              (2 * TFRC_T_MBI));
+                if (hctx->x_calc > (hctx->x_recv >> 5))
+                        hctx->x_recv /= 2;
                 else {
-                        hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc;
-                        hctx->ccid3hctx_x_recv <<= 4;
+                        hctx->x_recv = hctx->x_calc;
+                        hctx->x_recv <<= 4;
                 }
                 ccid3_hc_tx_update_x(sk, NULL);
         }
         ccid3_pr_debug("Reduced X to %llu/64 bytes/sec\n",
-                        (unsigned long long)hctx->ccid3hctx_x);
+                        (unsigned long long)hctx->x);
 
         /*
          * Set new timeout for the nofeedback timer.
          * See comments in packet_recv() regarding the value of t_RTO.
          */
-        if (unlikely(hctx->ccid3hctx_t_rto == 0))       /* no feedback yet */
+        if (unlikely(hctx->t_rto == 0))         /* no feedback received yet */
                 t_nfb = TFRC_INITIAL_TIMEOUT;
         else
-                t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi);
+                t_nfb = max(hctx->t_rto, 2 * hctx->t_ipi);
 
 restart_timer:
-        sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
+        sk_reset_timer(sk, &hctx->no_feedback_timer,
                            jiffies + usecs_to_jiffies(t_nfb));
 out:
         bh_unlock_sock(sk);
         sock_put(sk);
 }
 
-/*
- * returns
- *   > 0: delay (in msecs) that should pass before actually sending
- *   = 0: can send immediately
- *   < 0: error condition; do not send packet
+/**
+ * ccid3_hc_tx_send_packet  -  Delay-based dequeueing of TX packets
+ * @skb: next packet candidate to send on @sk
+ * This function uses the convention of ccid_packet_dequeue_eval() and
+ * returns a millisecond-delay value between 0 and t_mbi = 64000 msec.
  */
 static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
 {
@@ -305,18 +263,14 @@ static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
         if (unlikely(skb->len == 0))
                 return -EBADMSG;
 
-        switch (hctx->ccid3hctx_state) {
-        case TFRC_SSTATE_NO_SENT:
-                sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
-                               (jiffies +
+        if (hctx->s == 0) {
+                sk_reset_timer(sk, &hctx->no_feedback_timer, (jiffies +
                                 usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)));
-                hctx->ccid3hctx_last_win_count   = 0;
-                hctx->ccid3hctx_t_last_win_count = now;
+                hctx->last_win_count   = 0;
+                hctx->t_last_win_count = now;
 
                 /* Set t_0 for initial packet */
-                hctx->ccid3hctx_t_nom = now;
-
-                hctx->ccid3hctx_s = skb->len;
+                hctx->t_nom = now;
 
                 /*
                  * Use initial RTT sample when available: recommended by erratum
@@ -325,9 +279,9 @@ static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
                  */
                 if (dp->dccps_syn_rtt) {
                         ccid3_pr_debug("SYN RTT = %uus\n", dp->dccps_syn_rtt);
-                        hctx->ccid3hctx_rtt  = dp->dccps_syn_rtt;
-                        hctx->ccid3hctx_x    = rfc3390_initial_rate(sk);
-                        hctx->ccid3hctx_t_ld = now;
+                        hctx->rtt  = dp->dccps_syn_rtt;
+                        hctx->x    = rfc3390_initial_rate(sk);
+                        hctx->t_ld = now;
                 } else {
                         /*
                          * Sender does not have RTT sample:
@@ -335,17 +289,20 @@ static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
                          *   is needed in several parts (e.g.  window counter);
                          * - set sending rate X_pps = 1pps as per RFC 3448, 4.2.
                          */
-                        hctx->ccid3hctx_rtt = DCCP_FALLBACK_RTT;
-                        hctx->ccid3hctx_x   = hctx->ccid3hctx_s;
-                        hctx->ccid3hctx_x <<= 6;
+                        hctx->rtt = DCCP_FALLBACK_RTT;
+                        hctx->x   = dp->dccps_mss_cache;
+                        hctx->x <<= 6;
                 }
+
+                /* Compute t_ipi = s / X */
+                hctx->s = ccid3_hc_tx_measure_packet_size(sk, skb->len);
                 ccid3_update_send_interval(hctx);
 
-                ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK);
-                break;
-        case TFRC_SSTATE_NO_FBACK:
-        case TFRC_SSTATE_FBACK:
-                delay = ktime_us_delta(hctx->ccid3hctx_t_nom, now);
+                /* Seed value for Oscillation Prevention (sec. 4.5) */
+                hctx->r_sqmean = tfrc_scaled_sqrt(hctx->rtt);
+
+        } else {
+                delay = ktime_us_delta(hctx->t_nom, now);
                 ccid3_pr_debug("delay=%ld\n", (long)delay);
                 /*
                  *      Scheduling of packet transmissions [RFC 3448, 4.6]
@@ -355,99 +312,80 @@ static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
                  * else
                  *       // send the packet in (t_nom - t_now) milliseconds.
                  */
-                if (delay - (s64)hctx->ccid3hctx_delta >= 1000)
-                        return (u32)delay / 1000L;
+                if (delay >= TFRC_T_DELTA)
+                        return (u32)delay / USEC_PER_MSEC;
 
                 ccid3_hc_tx_update_win_count(hctx, now);
-                break;
-        case TFRC_SSTATE_TERM:
-                DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk);
-                return -EINVAL;
         }
 
         /* prepare to send now (add options etc.) */
         dp->dccps_hc_tx_insert_options = 1;
-        DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count;
+        DCCP_SKB_CB(skb)->dccpd_ccval  = hctx->last_win_count;
 
         /* set the nominal send time for the next following packet */
-        hctx->ccid3hctx_t_nom = ktime_add_us(hctx->ccid3hctx_t_nom,
-                                             hctx->ccid3hctx_t_ipi);
-        return 0;
+        hctx->t_nom = ktime_add_us(hctx->t_nom, hctx->t_ipi);
+        return CCID_PACKET_SEND_AT_ONCE;
 }
 
-static void ccid3_hc_tx_packet_sent(struct sock *sk, int more,
-                                    unsigned int len)
+static void ccid3_hc_tx_packet_sent(struct sock *sk, unsigned int len)
 {
         struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
 
-        ccid3_hc_tx_update_s(hctx, len);
+        /* Changes to s will become effective the next time X is computed */
+        hctx->s = ccid3_hc_tx_measure_packet_size(sk, len);
 
-        if (tfrc_tx_hist_add(&hctx->ccid3hctx_hist, dccp_sk(sk)->dccps_gss))
+        if (tfrc_tx_hist_add(&hctx->hist, dccp_sk(sk)->dccps_gss))
                 DCCP_CRIT("packet history - out of memory!");
 }
 
 static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
 {
         struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
-        struct ccid3_options_received *opt_recv;
+        struct tfrc_tx_hist_entry *acked;
         ktime_t now;
         unsigned long t_nfb;
-        u32 pinv, r_sample;
+        u32 r_sample;
 
         /* we are only interested in ACKs */
         if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK ||
               DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK))
                 return;
-        /* ... and only in the established state */
-        if (hctx->ccid3hctx_state != TFRC_SSTATE_FBACK &&
-            hctx->ccid3hctx_state != TFRC_SSTATE_NO_FBACK)
-                return;
-
-        opt_recv = &hctx->ccid3hctx_options_received;
-        now = ktime_get_real();
-
-        /* Estimate RTT from history if ACK number is valid */
-        r_sample = tfrc_tx_hist_rtt(hctx->ccid3hctx_hist,
-                                    DCCP_SKB_CB(skb)->dccpd_ack_seq, now);
-        if (r_sample == 0) {
-                DCCP_WARN("%s(%p): %s with bogus ACK-%llu\n", dccp_role(sk), sk,
-                          dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type),
-                          (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq);
+        /*
+         * Locate the acknowledged packet in the TX history.
+         *
+         * Returning "entry not found" here can for instance happen when
+         *  - the host has not sent out anything (e.g. a passive server),
+         *  - the Ack is outdated (packet with higher Ack number was received),
+         *  - it is a bogus Ack (for a packet not sent on this connection).
+         */
+        acked = tfrc_tx_hist_find_entry(hctx->hist, dccp_hdr_ack_seq(skb));
+        if (acked == NULL)
                 return;
-        }
+        /* For the sake of RTT sampling, ignore/remove all older entries */
+        tfrc_tx_hist_purge(&acked->next);
 
-        /* Update receive rate in units of 64 * bytes/second */
-        hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate;
-        hctx->ccid3hctx_x_recv <<= 6;
+        /* Update the moving average for the RTT estimate (RFC 3448, 4.3) */
+        now       = ktime_get_real();
+        r_sample  = dccp_sample_rtt(sk, ktime_us_delta(now, acked->stamp));
+        hctx->rtt = tfrc_ewma(hctx->rtt, r_sample, 9);
 
-        /* Update loss event rate (which is scaled by 1e6) */
-        pinv = opt_recv->ccid3or_loss_event_rate;
-        if (pinv == ~0U || pinv == 0)          /* see RFC 4342, 8.5   */
-                hctx->ccid3hctx_p = 0;
-        else                                   /* can not exceed 100% */
-                hctx->ccid3hctx_p = scaled_div(1, pinv);
-        /*
-         * Validate new RTT sample and update moving average
-         */
-        r_sample = dccp_sample_rtt(sk, r_sample);
-        hctx->ccid3hctx_rtt = tfrc_ewma(hctx->ccid3hctx_rtt, r_sample, 9);
         /*
          * Update allowed sending rate X as per draft rfc3448bis-00, 4.2/3
          */
-        if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) {
-                ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK);
+        if (!hctx->feedback) {
+                hctx->feedback = true;
 
-                if (hctx->ccid3hctx_t_rto == 0) {
+                if (hctx->t_rto == 0) {
                         /*
                          * Initial feedback packet: Larger Initial Windows (4.2)
                          */
-                        hctx->ccid3hctx_x    = rfc3390_initial_rate(sk);
-                        hctx->ccid3hctx_t_ld = now;
+                        hctx->x    = rfc3390_initial_rate(sk);
+                        hctx->t_ld = now;
 
                         ccid3_update_send_interval(hctx);
 
                         goto done_computing_x;
-                } else if (hctx->ccid3hctx_p == 0) {
+                } else if (hctx->p == 0) {
                         /*
                          * First feedback after nofeedback timer expiry (4.3)
                          */
@@ -456,25 +394,52 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
         }
 
         /* Update sending rate (step 4 of [RFC 3448, 4.3]) */
-        if (hctx->ccid3hctx_p > 0)
-                hctx->ccid3hctx_x_calc =
-                                tfrc_calc_x(hctx->ccid3hctx_s,
-                                            hctx->ccid3hctx_rtt,
-                                            hctx->ccid3hctx_p);
+        if (hctx->p > 0)
+                hctx->x_calc = tfrc_calc_x(hctx->s, hctx->rtt, hctx->p);
         ccid3_hc_tx_update_x(sk, &now);
 
 done_computing_x:
         ccid3_pr_debug("%s(%p), RTT=%uus (sample=%uus), s=%u, "
                                "p=%u, X_calc=%u, X_recv=%u, X=%u\n",
-                               dccp_role(sk),
-                               sk, hctx->ccid3hctx_rtt, r_sample,
-                               hctx->ccid3hctx_s, hctx->ccid3hctx_p,
-                               hctx->ccid3hctx_x_calc,
-                               (unsigned)(hctx->ccid3hctx_x_recv >> 6),
-                               (unsigned)(hctx->ccid3hctx_x >> 6));
+                               dccp_role(sk), sk, hctx->rtt, r_sample,
+                               hctx->s, hctx->p, hctx->x_calc,
+                               (unsigned)(hctx->x_recv >> 6),
+                               (unsigned)(hctx->x >> 6));
+        /*
+         * Oscillation Reduction (RFC 3448, 4.5) - modifying t_ipi according to
+         * RTT changes, multiplying by X/X_inst = sqrt(R_sample)/R_sqmean. This
+         * can be useful if few connections share a link, avoiding that buffer
+         * fill levels (RTT) oscillate as a result of frequent adjustments to X.
+         * A useful presentation with background information is in
+         *    Joerg Widmer, "Equation-Based Congestion Control",
+         *    MSc Thesis, University of Mannheim, Germany, 2000
+         * (sec. 3.6.4), who calls this ISM ("Inter-packet Space Modulation").
+         */
+        if (do_osc_prev) {
+                r_sample = tfrc_scaled_sqrt(r_sample);
+                /*
+                 * The modulation can work in both ways: increase/decrease t_ipi
+                 * according to long-term increases/decreases of the RTT. The
+                 * former is a useful measure, since it works against queue
+                 * build-up. The latter temporarily increases the sending rate,
+                 * so that buffers fill up more quickly. This in turn causes
+                 * the RTT to increase, so that either later reduction becomes
+                 * necessary or the RTT stays at a very high level. Decreasing
+                 * t_ipi is therefore not supported.
+                 * Furthermore, during the initial slow-start phase the RTT
+                 * naturally increases, where using the algorithm would cause
+                 * delays. Hence it is disabled during the initial slow-start.
+                 */
+                if (r_sample > hctx->r_sqmean && hctx->p > 0)
+                        hctx->t_ipi = div_u64((u64)hctx->t_ipi * (u64)r_sample,
+                                              hctx->r_sqmean);
+                hctx->t_ipi = min_t(u32, hctx->t_ipi, TFRC_T_MBI);
+                /* update R_sqmean _after_ computing the modulation factor */
+                hctx->r_sqmean = tfrc_ewma(hctx->r_sqmean, r_sample, 9);
+        }
 
         /* unschedule no feedback timer */
-        sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer);
+        sk_stop_timer(sk, &hctx->no_feedback_timer);
 
         /*
          * As we have calculated new ipi, delta, t_nom it is possible
@@ -488,95 +453,66 @@ done_computing_x:
          * This can help avoid triggering the nofeedback timer too
          * often ('spinning') on LANs with small RTTs.
          */
-        hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt,
-                                           (CONFIG_IP_DCCP_CCID3_RTO *
-                                            (USEC_PER_SEC / 1000)));
+        hctx->t_rto = max_t(u32, 4 * hctx->rtt, (CONFIG_IP_DCCP_CCID3_RTO *
+                                                 (USEC_PER_SEC / 1000)));
         /*
          * Schedule no feedback timer to expire in
          * max(t_RTO, 2 * s/X)  =  max(t_RTO, 2 * t_ipi)
          */
-        t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi);
+        t_nfb = max(hctx->t_rto, 2 * hctx->t_ipi);
 
         ccid3_pr_debug("%s(%p), Scheduled no feedback timer to "
                        "expire in %lu jiffies (%luus)\n",
-                       dccp_role(sk),
-                       sk, usecs_to_jiffies(t_nfb), t_nfb);
+                       dccp_role(sk), sk, usecs_to_jiffies(t_nfb), t_nfb);
 
-        sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
+        sk_reset_timer(sk, &hctx->no_feedback_timer,
                            jiffies + usecs_to_jiffies(t_nfb));
 }
 
-static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option,
-                                     unsigned char len, u16 idx,
-                                     unsigned char *value)
+static int ccid3_hc_tx_parse_options(struct sock *sk, u8 packet_type,
+                                     u8 option, u8 *optval, u8 optlen)
 {
-        int rc = 0;
-        const struct dccp_sock *dp = dccp_sk(sk);
         struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
-        struct ccid3_options_received *opt_recv;
         __be32 opt_val;
 
-        opt_recv = &hctx->ccid3hctx_options_received;
-
-        if (opt_recv->ccid3or_seqno != dp->dccps_gsr) {
-                opt_recv->ccid3or_seqno              = dp->dccps_gsr;
-                opt_recv->ccid3or_loss_event_rate    = ~0;
-                opt_recv->ccid3or_loss_intervals_idx = 0;
-                opt_recv->ccid3or_loss_intervals_len = 0;
-                opt_recv->ccid3or_receive_rate       = 0;
-        }
-
         switch (option) {
+        case TFRC_OPT_RECEIVE_RATE:
         case TFRC_OPT_LOSS_EVENT_RATE:
-                if (unlikely(len != 4)) {
-                        DCCP_WARN("%s(%p), invalid len %d "
-                                  "for TFRC_OPT_LOSS_EVENT_RATE\n",
-                                  dccp_role(sk), sk, len);
-                        rc = -EINVAL;
-                } else {
-                        opt_val = get_unaligned((__be32 *)value);
-                        opt_recv->ccid3or_loss_event_rate = ntohl(opt_val);
-                        ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n",
-                                       dccp_role(sk), sk,
-                                       opt_recv->ccid3or_loss_event_rate);
+                /* Must be ignored on Data packets, cf. RFC 4342 8.3 and 8.5 */
+                if (packet_type == DCCP_PKT_DATA)
+                        break;
+                if (unlikely(optlen != 4)) {
+                        DCCP_WARN("%s(%p), invalid len %d for %u\n",
+                                  dccp_role(sk), sk, optlen, option);
+                        return -EINVAL;
                 }
-                break;
-        case TFRC_OPT_LOSS_INTERVALS:
-                opt_recv->ccid3or_loss_intervals_idx = idx;
-                opt_recv->ccid3or_loss_intervals_len = len;
-                ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n",
-                               dccp_role(sk), sk,
-                               opt_recv->ccid3or_loss_intervals_idx,
-                               opt_recv->ccid3or_loss_intervals_len);
-                break;
-        case TFRC_OPT_RECEIVE_RATE:
-                if (unlikely(len != 4)) {
-                        DCCP_WARN("%s(%p), invalid len %d "
-                                  "for TFRC_OPT_RECEIVE_RATE\n",
-                                  dccp_role(sk), sk, len);
-                        rc = -EINVAL;
-                } else {
-                        opt_val = get_unaligned((__be32 *)value);
-                        opt_recv->ccid3or_receive_rate = ntohl(opt_val);
+                opt_val = ntohl(get_unaligned((__be32 *)optval));
+
+                if (option == TFRC_OPT_RECEIVE_RATE) {
+                        /* Receive Rate is kept in units of 64 bytes/second */
+                        hctx->x_recv = opt_val;
+                        hctx->x_recv <<= 6;
+
                         ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n",
-                                       dccp_role(sk), sk,
-                                       opt_recv->ccid3or_receive_rate);
+                                       dccp_role(sk), sk, opt_val);
+                } else {
+                        /* Update the fixpoint Loss Event Rate fraction */
+                        hctx->p = tfrc_invert_loss_event_rate(opt_val);
+
+                        ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n",
+                                       dccp_role(sk), sk, opt_val);
                 }
-                break;
         }
-
-        return rc;
+        return 0;
 }
 
 static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk)
 {
         struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid);
 
-        hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT;
-        hctx->ccid3hctx_hist = NULL;
-        setup_timer(&hctx->ccid3hctx_no_feedback_timer,
-                        ccid3_hc_tx_no_feedback_timer, (unsigned long)sk);
-
+        hctx->hist  = NULL;
+        setup_timer(&hctx->no_feedback_timer,
+                    ccid3_hc_tx_no_feedback_timer, (unsigned long)sk);
         return 0;
 }
 
@@ -584,42 +520,36 @@ static void ccid3_hc_tx_exit(struct sock *sk)
 {
         struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
 
-        ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM);
-        sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer);
-
-        tfrc_tx_hist_purge(&hctx->ccid3hctx_hist);
+        sk_stop_timer(sk, &hctx->no_feedback_timer);
+        tfrc_tx_hist_purge(&hctx->hist);
 }
 
 static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info)
 {
-        struct ccid3_hc_tx_sock *hctx;
-
-        /* Listen socks doesn't have a private CCID block */
-        if (sk->sk_state == DCCP_LISTEN)
-                return;
-
-        hctx = ccid3_hc_tx_sk(sk);
-        info->tcpi_rto = hctx->ccid3hctx_t_rto;
-        info->tcpi_rtt = hctx->ccid3hctx_rtt;
+        info->tcpi_rto = ccid3_hc_tx_sk(sk)->t_rto;
+        info->tcpi_rtt = ccid3_hc_tx_sk(sk)->rtt;
 }
 
 static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len,
                                   u32 __user *optval, int __user *optlen)
 {
-        const struct ccid3_hc_tx_sock *hctx;
+        const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
+        struct tfrc_tx_info tfrc;
         const void *val;
 
-        /* Listen socks doesn't have a private CCID block */
-        if (sk->sk_state == DCCP_LISTEN)
-                return -EINVAL;
-
-        hctx = ccid3_hc_tx_sk(sk);
         switch (optname) {
         case DCCP_SOCKOPT_CCID_TX_INFO:
-                if (len < sizeof(hctx->ccid3hctx_tfrc))
+                if (len < sizeof(tfrc))
                         return -EINVAL;
-                len = sizeof(hctx->ccid3hctx_tfrc);
-                val = &hctx->ccid3hctx_tfrc;
+                tfrc.tfrctx_x      = hctx->x;
+                tfrc.tfrctx_x_recv = hctx->x_recv;
+                tfrc.tfrctx_x_calc = hctx->x_calc;
+                tfrc.tfrctx_rtt    = hctx->rtt;
+                tfrc.tfrctx_p      = hctx->p;
+                tfrc.tfrctx_rto    = hctx->t_rto;
+                tfrc.tfrctx_ipi    = hctx->t_ipi;
+                len = sizeof(tfrc);
+                val = &tfrc;
                 break;
         default:
                 return -ENOPROTOOPT;
@@ -634,112 +564,82 @@ static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len,
 /*
  *      Receiver Half-Connection Routines
  */
-
-/* CCID3 feedback types */
-enum ccid3_fback_type {
-        CCID3_FBACK_NONE = 0,
-        CCID3_FBACK_INITIAL,
-        CCID3_FBACK_PERIODIC,
-        CCID3_FBACK_PARAM_CHANGE
-};
-
-#ifdef CONFIG_IP_DCCP_CCID3_DEBUG
-static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state)
-{
-        static char *ccid3_rx_state_names[] = {
-        [TFRC_RSTATE_NO_DATA] = "NO_DATA",
-        [TFRC_RSTATE_DATA]    = "DATA",
-        [TFRC_RSTATE_TERM]    = "TERM",
-        };
-
-        return ccid3_rx_state_names[state];
-}
-#endif
-
-static void ccid3_hc_rx_set_state(struct sock *sk,
-                                  enum ccid3_hc_rx_states state)
-{
-        struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
-        enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state;
-
-        ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
-                       dccp_role(sk), sk, ccid3_rx_state_name(oldstate),
-                       ccid3_rx_state_name(state));
-        WARN_ON(state == oldstate);
-        hcrx->ccid3hcrx_state = state;
-}
-
 static void ccid3_hc_rx_send_feedback(struct sock *sk,
                                       const struct sk_buff *skb,
                                       enum ccid3_fback_type fbtype)
 {
         struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
-        struct dccp_sock *dp = dccp_sk(sk);
-        ktime_t now;
-        s64 delta = 0;
-
-        if (unlikely(hcrx->ccid3hcrx_state == TFRC_RSTATE_TERM))
-                return;
-
-        now = ktime_get_real();
 
         switch (fbtype) {
         case CCID3_FBACK_INITIAL:
-                hcrx->ccid3hcrx_x_recv = 0;
-                hcrx->ccid3hcrx_pinv   = ~0U;   /* see RFC 4342, 8.5 */
+                hcrx->x_recv = 0;
+                hcrx->p_inverse = ~0U;   /* see RFC 4342, 8.5 */
                 break;
         case CCID3_FBACK_PARAM_CHANGE:
+                if (unlikely(hcrx->feedback == CCID3_FBACK_NONE)) {
+                        /*
+                         * rfc3448bis-06, 6.3.1: First packet(s) lost or marked
+                         * FIXME: in rfc3448bis the receiver returns X_recv=0
+                         * here as it normally would in the first feedback packet.
+                         * However this is not possible yet, since the code still
+                         * uses RFC 3448, i.e.
+                         *    If (p > 0)
+                         *      Calculate X_calc using the TCP throughput equation.
+                         *      X = max(min(X_calc, 2*X_recv), s/t_mbi);
+                         * would bring X down to s/t_mbi. That is why we return
+                         * X_recv according to rfc3448bis-06 for the moment.
+                         */
+                        u32 s = tfrc_rx_hist_packet_size(&hcrx->hist),
+                            rtt = tfrc_rx_hist_rtt(&hcrx->hist);
+
+                        hcrx->x_recv = scaled_div32(s, 2 * rtt);
+                        break;
+                }
                 /*
                  * When parameters change (new loss or p > p_prev), we do not
                  * have a reliable estimate for R_m of [RFC 3448, 6.2] and so
-                 * need to  reuse the previous value of X_recv. However, when
-                 * X_recv was 0 (due to early loss), this would kill X down to
-                 * s/t_mbi (i.e. one packet in 64 seconds).
-                 * To avoid such drastic reduction, we approximate X_recv as
-                 * the number of bytes since last feedback.
-                 * This is a safe fallback, since X is bounded above by X_calc.
+                 * always check whether at least RTT time units were covered.
                  */
-                if (hcrx->ccid3hcrx_x_recv > 0)
-                        break;
-                /* fall through */
+                hcrx->x_recv = tfrc_rx_hist_x_recv(&hcrx->hist, hcrx->x_recv);
+                break;
         case CCID3_FBACK_PERIODIC:
-                delta = ktime_us_delta(now, hcrx->ccid3hcrx_tstamp_last_feedback);
-                if (delta <= 0)
-                        DCCP_BUG("delta (%ld) <= 0", (long)delta);
-                else
-                        hcrx->ccid3hcrx_x_recv =
-                                scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta);
+                /*
+                 * Step (2) of rfc3448bis-06, 6.2:
+                 * - if no data packets have been received, just restart timer
+                 * - if data packets have been received, re-compute X_recv
+                 */
+                if (hcrx->hist.bytes_recvd == 0)
+                        goto prepare_for_next_time;
+                hcrx->x_recv = tfrc_rx_hist_x_recv(&hcrx->hist, hcrx->x_recv);
                 break;
         default:
                 return;
         }
 
-        ccid3_pr_debug("Interval %ldusec, X_recv=%u, 1/p=%u\n", (long)delta,
-                       hcrx->ccid3hcrx_x_recv, hcrx->ccid3hcrx_pinv);
-
-        hcrx->ccid3hcrx_tstamp_last_feedback = now;
-        hcrx->ccid3hcrx_last_counter         = dccp_hdr(skb)->dccph_ccval;
-        hcrx->ccid3hcrx_bytes_recv           = 0;
+        ccid3_pr_debug("X_recv=%u, 1/p=%u\n", hcrx->x_recv, hcrx->p_inverse);
 
-        dp->dccps_hc_rx_insert_options = 1;
+        dccp_sk(sk)->dccps_hc_rx_insert_options = 1;
         dccp_send_ack(sk);
+
+prepare_for_next_time:
+        tfrc_rx_hist_restart_byte_counter(&hcrx->hist);
+        hcrx->last_counter = dccp_hdr(skb)->dccph_ccval;
+        hcrx->feedback     = fbtype;
 }
 
 static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb)
 {
-        const struct ccid3_hc_rx_sock *hcrx;
+        const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
         __be32 x_recv, pinv;
 
         if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN))
                 return 0;
 
-        hcrx = ccid3_hc_rx_sk(sk);
-
         if (dccp_packet_without_ack(skb))
                 return 0;
 
-        x_recv = htonl(hcrx->ccid3hcrx_x_recv);
-        pinv   = htonl(hcrx->ccid3hcrx_pinv);
+        x_recv = htonl(hcrx->x_recv);
+        pinv   = htonl(hcrx->p_inverse);
 
         if (dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE,
                                &pinv, sizeof(pinv)) ||
@@ -762,171 +662,95 @@ static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb)
 static u32 ccid3_first_li(struct sock *sk)
 {
         struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
-        u32 x_recv, p, delta;
+        u32 s = tfrc_rx_hist_packet_size(&hcrx->hist),
+            rtt = tfrc_rx_hist_rtt(&hcrx->hist), x_recv, p;
         u64 fval;
 
-        if (hcrx->ccid3hcrx_rtt == 0) {
-                DCCP_WARN("No RTT estimate available, using fallback RTT\n");
-                hcrx->ccid3hcrx_rtt = DCCP_FALLBACK_RTT;
-        }
+        /*
+         * rfc3448bis-06, 6.3.1: First data packet(s) are marked or lost. Set p
+         * to give the equivalent of X_target = s/(2*R). Thus fval = 2 and so p
+         * is about 20.64%. This yields an interval length of 4.84 (rounded up).
+         */
+        if (unlikely(hcrx->feedback == CCID3_FBACK_NONE))
+                return 5;
 
-        delta = ktime_to_us(net_timedelta(hcrx->ccid3hcrx_tstamp_last_feedback));
-        x_recv = scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta);
-        if (x_recv == 0) {              /* would also trigger divide-by-zero */
-                DCCP_WARN("X_recv==0\n");
-                if ((x_recv = hcrx->ccid3hcrx_x_recv) == 0) {
-                        DCCP_BUG("stored value of X_recv is zero");
-                        return ~0U;
-                }
-        }
+        x_recv = tfrc_rx_hist_x_recv(&hcrx->hist, hcrx->x_recv);
+        if (x_recv == 0)
+                goto failed;
 
-        fval = scaled_div(hcrx->ccid3hcrx_s, hcrx->ccid3hcrx_rtt);
-        fval = scaled_div32(fval, x_recv);
+        fval = scaled_div32(scaled_div(s, rtt), x_recv);
         p = tfrc_calc_x_reverse_lookup(fval);
 
         ccid3_pr_debug("%s(%p), receive rate=%u bytes/s, implied "
                        "loss rate=%u\n", dccp_role(sk), sk, x_recv, p);
 
-        return p == 0 ? ~0U : scaled_div(1, p);
+        if (p > 0)
+                return scaled_div(1, p);
+failed:
+        return UINT_MAX;
 }
 
 static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
 {
         struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
-        enum ccid3_fback_type do_feedback = CCID3_FBACK_NONE;
         const u64 ndp = dccp_sk(sk)->dccps_options_received.dccpor_ndp;
         const bool is_data_packet = dccp_data_packet(skb);
 
-        if (unlikely(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)) {
-                if (is_data_packet) {
-                        const u32 payload = skb->len - dccp_hdr(skb)->dccph_doff * 4;
-                        do_feedback = CCID3_FBACK_INITIAL;
-                        ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA);
-                        hcrx->ccid3hcrx_s = payload;
-                        /*
-                         * Not necessary to update ccid3hcrx_bytes_recv here,
-                         * since X_recv = 0 for the first feedback packet (cf.
-                         * RFC 3448, 6.3) -- gerrit
-                         */
-                }
-                goto update_records;
-        }
-
-        if (tfrc_rx_hist_duplicate(&hcrx->ccid3hcrx_hist, skb))
-                return; /* done receiving */
-
-        if (is_data_packet) {
-                const u32 payload = skb->len - dccp_hdr(skb)->dccph_doff * 4;
-                /*
-                 * Update moving-average of s and the sum of received payload bytes
-                 */
-                hcrx->ccid3hcrx_s = tfrc_ewma(hcrx->ccid3hcrx_s, payload, 9);
-                hcrx->ccid3hcrx_bytes_recv += payload;
-        }
-
         /*
          * Perform loss detection and handle pending losses
          */
-        if (tfrc_rx_handle_loss(&hcrx->ccid3hcrx_hist, &hcrx->ccid3hcrx_li_hist,
-                                skb, ndp, ccid3_first_li, sk)) {
-                do_feedback = CCID3_FBACK_PARAM_CHANGE;
-                goto done_receiving;
-        }
-
-        if (tfrc_rx_hist_loss_pending(&hcrx->ccid3hcrx_hist))
-                return; /* done receiving */
-
+        if (tfrc_rx_congestion_event(&hcrx->hist, &hcrx->li_hist,
+                                     skb, ndp, ccid3_first_li, sk))
+                ccid3_hc_rx_send_feedback(sk, skb, CCID3_FBACK_PARAM_CHANGE);
         /*
-         * Handle data packets: RTT sampling and monitoring p
+         * Feedback for first non-empty data packet (RFC 3448, 6.3)
          */
-        if (unlikely(!is_data_packet))
-                goto update_records;
-
-        if (!tfrc_lh_is_initialised(&hcrx->ccid3hcrx_li_hist)) {
-                const u32 sample = tfrc_rx_hist_sample_rtt(&hcrx->ccid3hcrx_hist, skb);
-                /*
-                 * Empty loss history: no loss so far, hence p stays 0.
-                 * Sample RTT values, since an RTT estimate is required for the
-                 * computation of p when the first loss occurs; RFC 3448, 6.3.1.
-                 */
-                if (sample != 0)
-                        hcrx->ccid3hcrx_rtt = tfrc_ewma(hcrx->ccid3hcrx_rtt, sample, 9);
-
-        } else if (tfrc_lh_update_i_mean(&hcrx->ccid3hcrx_li_hist, skb)) {
-                /*
-                 * Step (3) of [RFC 3448, 6.1]: Recompute I_mean and, if I_mean
-                 * has decreased (resp. p has increased), send feedback now.
-                 */
-                do_feedback = CCID3_FBACK_PARAM_CHANGE;
-        }
-
+        else if (unlikely(hcrx->feedback == CCID3_FBACK_NONE && is_data_packet))
+                ccid3_hc_rx_send_feedback(sk, skb, CCID3_FBACK_INITIAL);
         /*
          * Check if the periodic once-per-RTT feedback is due; RFC 4342, 10.3
          */
-        if (SUB16(dccp_hdr(skb)->dccph_ccval, hcrx->ccid3hcrx_last_counter) > 3)
-                do_feedback = CCID3_FBACK_PERIODIC;
-
-update_records:
-        tfrc_rx_hist_add_packet(&hcrx->ccid3hcrx_hist, skb, ndp);
-
-done_receiving:
-        if (do_feedback)
-                ccid3_hc_rx_send_feedback(sk, skb, do_feedback);
+        else if (!tfrc_rx_hist_loss_pending(&hcrx->hist) && is_data_packet &&
+                 SUB16(dccp_hdr(skb)->dccph_ccval, hcrx->last_counter) > 3)
+                ccid3_hc_rx_send_feedback(sk, skb, CCID3_FBACK_PERIODIC);
 }
 
 static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk)
 {
         struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid);
 
-        hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA;
-        tfrc_lh_init(&hcrx->ccid3hcrx_li_hist);
-        return tfrc_rx_hist_alloc(&hcrx->ccid3hcrx_hist);
+        tfrc_lh_init(&hcrx->li_hist);
+        return tfrc_rx_hist_init(&hcrx->hist, sk);
 }
 
 static void ccid3_hc_rx_exit(struct sock *sk)
 {
         struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
 
-        ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM);
-
-        tfrc_rx_hist_purge(&hcrx->ccid3hcrx_hist);
-        tfrc_lh_cleanup(&hcrx->ccid3hcrx_li_hist);
+        tfrc_rx_hist_purge(&hcrx->hist);
+        tfrc_lh_cleanup(&hcrx->li_hist);
 }
 
 static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info)
 {
-        const struct ccid3_hc_rx_sock *hcrx;
-
-        /* Listen socks doesn't have a private CCID block */
-        if (sk->sk_state == DCCP_LISTEN)
-                return;
-
-        hcrx = ccid3_hc_rx_sk(sk);
-        info->tcpi_ca_state = hcrx->ccid3hcrx_state;
         info->tcpi_options  |= TCPI_OPT_TIMESTAMPS;
-        info->tcpi_rcv_rtt  = hcrx->ccid3hcrx_rtt;
+        info->tcpi_rcv_rtt  = tfrc_rx_hist_rtt(&ccid3_hc_rx_sk(sk)->hist);
 }
 
 static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len,
                                   u32 __user *optval, int __user *optlen)
 {
-        const struct ccid3_hc_rx_sock *hcrx;
+        const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
         struct tfrc_rx_info rx_info;
         const void *val;
 
-        /* Listen socks doesn't have a private CCID block */
-        if (sk->sk_state == DCCP_LISTEN)
-                return -EINVAL;
-
-        hcrx = ccid3_hc_rx_sk(sk);
         switch (optname) {
         case DCCP_SOCKOPT_CCID_RX_INFO:
                 if (len < sizeof(rx_info))
                         return -EINVAL;
-                rx_info.tfrcrx_x_recv = hcrx->ccid3hcrx_x_recv;
-                rx_info.tfrcrx_rtt    = hcrx->ccid3hcrx_rtt;
-                rx_info.tfrcrx_p      = hcrx->ccid3hcrx_pinv == 0 ? ~0U :
-                                           scaled_div(1, hcrx->ccid3hcrx_pinv);
+                rx_info.tfrcrx_x_recv = hcrx->x_recv;
+                rx_info.tfrcrx_rtt    = tfrc_rx_hist_rtt(&hcrx->hist);
+                rx_info.tfrcrx_p      = tfrc_invert_loss_event_rate(hcrx->p_inverse);
                 len = sizeof(rx_info);
                 val = &rx_info;
                 break;
@@ -962,6 +786,9 @@ static struct ccid_operations ccid3 = {
         .ccid_hc_tx_getsockopt     = ccid3_hc_tx_getsockopt,
 };
 
+module_param(do_osc_prev, bool, 0644);
+MODULE_PARM_DESC(do_osc_prev, "Use Oscillation Prevention (RFC 3448, 4.5)");
+
 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
 module_param(ccid3_debug, bool, 0644);
 MODULE_PARM_DESC(ccid3_debug, "Enable debug messages");
@@ -969,6 +796,19 @@ MODULE_PARM_DESC(ccid3_debug, "Enable debug messages");
 
 static __init int ccid3_module_init(void)
 {
+        struct timespec tp;
+
+        /*
+         * Without a fine-grained clock resolution, RTTs/X_recv are not sampled
+         * correctly and feedback is sent either too early or too late.
+         */
+        hrtimer_get_res(CLOCK_MONOTONIC, &tp);
+        if (tp.tv_sec || tp.tv_nsec > DCCP_TIME_RESOLUTION * NSEC_PER_USEC) {
+                printk(KERN_ERR "%s: Timer too coarse (%ld usec), need %u-usec"
+                       " resolution - check your clocksource.\n", __func__,
+                       tp.tv_nsec/NSEC_PER_USEC, DCCP_TIME_RESOLUTION);
+                return -ESOCKTNOSUPPORT;
+        }
         return ccid_register(&ccid3);
 }
 module_init(ccid3_module_init);
diff --git a/net/dccp/ccids/ccid3.h b/net/dccp/ccids/ccid3.h
index 49ca32bd7e79..af6e1bf937d9 100644
--- a/net/dccp/ccids/ccid3.h
+++ b/net/dccp/ccids/ccid3.h
@@ -47,11 +47,22 @@
 /* Two seconds as per RFC 3448 4.2 */
 #define TFRC_INITIAL_TIMEOUT       (2 * USEC_PER_SEC)
 
-/* In usecs - half the scheduling granularity as per RFC3448 4.6 */
-#define TFRC_OPSYS_HALF_TIME_GRAN  (USEC_PER_SEC / (2 * HZ))
+/* Maximum backoff interval t_mbi (RFC 3448, 4.3) */
+#define TFRC_T_MBI                 (64 * USEC_PER_SEC)
 
-/* Parameter t_mbi from [RFC 3448, 4.3]: backoff interval in seconds */
-#define TFRC_T_MBI                 64
+/*
+ * The t_delta parameter (RFC 3448, 4.6): delays of less than %USEC_PER_MSEC are
+ * rounded down to 0, since sk_reset_timer() here uses millisecond granularity.
+ * Hence we can use a constant t_delta = %USEC_PER_MSEC when HZ >= 500. A coarse
+ * resolution of HZ < 500 means that the error is below one timer tick (t_gran)
+ * when using the constant t_delta  =  t_gran / 2  =  %USEC_PER_SEC / (2 * HZ).
+ */
+#if (HZ >= 500)
+# define TFRC_T_DELTA              USEC_PER_MSEC
+#else
+# define TFRC_T_DELTA              (USEC_PER_SEC / (2 * HZ))
+#warning Coarse CONFIG_HZ resolution -- higher value recommended for TFRC.
+#endif
 
 enum ccid3_options {
         TFRC_OPT_LOSS_EVENT_RATE = 192,
@@ -59,62 +70,43 @@ enum ccid3_options {
         TFRC_OPT_RECEIVE_RATE    = 194,
 };
 
-struct ccid3_options_received {
-        u64 ccid3or_seqno:48,
-            ccid3or_loss_intervals_idx:16;
-        u16 ccid3or_loss_intervals_len;
-        u32 ccid3or_loss_event_rate;
-        u32 ccid3or_receive_rate;
-};
-
-/* TFRC sender states */
-enum ccid3_hc_tx_states {
-        TFRC_SSTATE_NO_SENT = 1,
-        TFRC_SSTATE_NO_FBACK,
-        TFRC_SSTATE_FBACK,
-        TFRC_SSTATE_TERM,
-};
-
 /** struct ccid3_hc_tx_sock - CCID3 sender half-connection socket
  *
- * @ccid3hctx_x - Current sending rate in 64 * bytes per second
- * @ccid3hctx_x_recv - Receive rate    in 64 * bytes per second
- * @ccid3hctx_x_calc - Calculated rate in bytes per second
- * @ccid3hctx_rtt - Estimate of current round trip time in usecs
- * @ccid3hctx_p - Current loss event rate (0-1) scaled by 1000000
- * @ccid3hctx_s - Packet size in bytes
- * @ccid3hctx_t_rto - Nofeedback Timer setting in usecs
- * @ccid3hctx_t_ipi - Interpacket (send) interval (RFC 3448, 4.6) in usecs
- * @ccid3hctx_state - Sender state, one of %ccid3_hc_tx_states
- * @ccid3hctx_last_win_count - Last window counter sent
- * @ccid3hctx_t_last_win_count - Timestamp of earliest packet
- *                               with last_win_count value sent
- * @ccid3hctx_no_feedback_timer - Handle to no feedback timer
- * @ccid3hctx_t_ld - Time last doubled during slow start
- * @ccid3hctx_t_nom - Nominal send time of next packet
- * @ccid3hctx_delta - Send timer delta (RFC 3448, 4.6) in usecs
- * @ccid3hctx_hist - Packet history
- * @ccid3hctx_options_received - Parsed set of retrieved options
+ * @x - Current sending rate in 64 * bytes per second
+ * @x_recv - Receive rate    in 64 * bytes per second
+ * @x_calc - Calculated rate in bytes per second
+ * @rtt - Estimate of current round trip time in usecs
+ * @r_sqmean - Estimate of long-term RTT (RFC 3448, 4.5)
+ * @p - Current loss event rate (0-1) scaled by 1000000
+ * @s - Packet size in bytes
+ * @t_rto - Nofeedback Timer setting in usecs
+ * @t_ipi - Interpacket (send) interval (RFC 3448, 4.6) in usecs
+ * @feedback - Whether feedback has been received or not
+ * @last_win_count - Last window counter sent
+ * @t_last_win_count - Timestamp of earliest packet with
+ *                     last_win_count value sent
+ * @no_feedback_timer - Handle to no feedback timer
+ * @t_ld - Time last doubled during slow start
+ * @t_nom - Nominal send time of next packet
+ * @hist - Packet history
  */
 struct ccid3_hc_tx_sock {
-        struct tfrc_tx_info             ccid3hctx_tfrc;
-#define ccid3hctx_x                     ccid3hctx_tfrc.tfrctx_x
-#define ccid3hctx_x_recv                ccid3hctx_tfrc.tfrctx_x_recv
-#define ccid3hctx_x_calc                ccid3hctx_tfrc.tfrctx_x_calc
-#define ccid3hctx_rtt                   ccid3hctx_tfrc.tfrctx_rtt
-#define ccid3hctx_p                     ccid3hctx_tfrc.tfrctx_p
-#define ccid3hctx_t_rto                 ccid3hctx_tfrc.tfrctx_rto
-#define ccid3hctx_t_ipi                 ccid3hctx_tfrc.tfrctx_ipi
-        u16                             ccid3hctx_s;
-        enum ccid3_hc_tx_states         ccid3hctx_state:8;
-        u8                              ccid3hctx_last_win_count;
-        ktime_t                         ccid3hctx_t_last_win_count;
-        struct timer_list               ccid3hctx_no_feedback_timer;
-        ktime_t                         ccid3hctx_t_ld;
-        ktime_t                         ccid3hctx_t_nom;
-        u32                             ccid3hctx_delta;
-        struct tfrc_tx_hist_entry       *ccid3hctx_hist;
-        struct ccid3_options_received   ccid3hctx_options_received;
+        u64                             x;
+        u64                             x_recv;
+        u32                             x_calc;
+        u32                             rtt;
+        u16                             r_sqmean;
+        u32                             p;
+        u32                             t_rto;
+        u32                             t_ipi;
+        u16                             s;
+        bool                            feedback:1;
+        u8                              last_win_count;
+        ktime_t                         t_last_win_count;
+        struct timer_list               no_feedback_timer;
+        ktime_t                         t_ld;
+        ktime_t                         t_nom;
+        struct tfrc_tx_hist_entry       *hist;
 };
 
 static inline struct ccid3_hc_tx_sock *ccid3_hc_tx_sk(const struct sock *sk)
@@ -124,41 +116,32 @@ static inline struct ccid3_hc_tx_sock *ccid3_hc_tx_sk(const struct sock *sk)
     return hctx;
 }
 
-/* TFRC receiver states */
-enum ccid3_hc_rx_states {
-        TFRC_RSTATE_NO_DATA = 1,
-        TFRC_RSTATE_DATA,
-        TFRC_RSTATE_TERM    = 127,
+
+enum ccid3_fback_type {
+        CCID3_FBACK_NONE = 0,
+        CCID3_FBACK_INITIAL,
+        CCID3_FBACK_PERIODIC,
+        CCID3_FBACK_PARAM_CHANGE
 };
 
 /** struct ccid3_hc_rx_sock - CCID3 receiver half-connection socket
  *
- *  @ccid3hcrx_x_recv  -  Receiver estimate of send rate (RFC 3448 4.3)
- *  @ccid3hcrx_rtt  -  Receiver estimate of rtt (non-standard)
- *  @ccid3hcrx_p  -  Current loss event rate (RFC 3448 5.4)
- *  @ccid3hcrx_last_counter  -  Tracks window counter (RFC 4342, 8.1)
- *  @ccid3hcrx_state  -  Receiver state, one of %ccid3_hc_rx_states
- *  @ccid3hcrx_bytes_recv  -  Total sum of DCCP payload bytes
- *  @ccid3hcrx_x_recv  -  Receiver estimate of send rate (RFC 3448, sec. 4.3)
- *  @ccid3hcrx_rtt  -  Receiver estimate of RTT
- *  @ccid3hcrx_tstamp_last_feedback  -  Time at which last feedback was sent
- *  @ccid3hcrx_tstamp_last_ack  -  Time at which last feedback was sent
- *  @ccid3hcrx_hist  -  Packet history (loss detection + RTT sampling)
- *  @ccid3hcrx_li_hist  -  Loss Interval database
- *  @ccid3hcrx_s  -  Received packet size in bytes
- *  @ccid3hcrx_pinv  -  Inverse of Loss Event Rate (RFC 4342, sec. 8.5)
+ *  @last_counter  -  Tracks window counter (RFC 4342, 8.1)
+ *  @feedback  -  The type of the feedback last sent
+ *  @x_recv  -  Receiver estimate of send rate (RFC 3448, sec. 4.3)
+ *  @tstamp_last_feedback  -  Time at which last feedback was sent
+ *  @hist  -  Packet history (loss detection + RTT sampling)
+ *  @li_hist  -  Loss Interval database
+ *  @p_inverse  -  Inverse of Loss Event Rate (RFC 4342, sec. 8.5)
  */
 struct ccid3_hc_rx_sock {
-        u8                              ccid3hcrx_last_counter:4;
-        enum ccid3_hc_rx_states         ccid3hcrx_state:8;
-        u32                             ccid3hcrx_bytes_recv;
-        u32                             ccid3hcrx_x_recv;
-        u32                             ccid3hcrx_rtt;
-        ktime_t                         ccid3hcrx_tstamp_last_feedback;
-        struct tfrc_rx_hist             ccid3hcrx_hist;
-        struct tfrc_loss_hist           ccid3hcrx_li_hist;
-        u16                             ccid3hcrx_s;
-#define ccid3hcrx_pinv                  ccid3hcrx_li_hist.i_mean
+        u8                              last_counter:4;
+        enum ccid3_fback_type           feedback:4;
+        u32                             x_recv;
+        ktime_t                         tstamp_last_feedback;
+        struct tfrc_rx_hist             hist;
+        struct tfrc_loss_hist           li_hist;
+#define p_inverse                       li_hist.i_mean
 };
 
 static inline struct ccid3_hc_rx_sock *ccid3_hc_rx_sk(const struct sock *sk)
diff --git a/net/dccp/ccids/lib/loss_interval.c b/net/dccp/ccids/lib/loss_interval.c
index 5b3ce0688c5c..b1ae8f8259e5 100644
--- a/net/dccp/ccids/lib/loss_interval.c
+++ b/net/dccp/ccids/lib/loss_interval.c
@@ -86,21 +86,26 @@ static void tfrc_lh_calc_i_mean(struct tfrc_loss_hist *lh)
 
 /**
  * tfrc_lh_update_i_mean  -  Update the `open' loss interval I_0
- * For recomputing p: returns `true' if p > p_prev  <=>  1/p < 1/p_prev
+ * This updates I_mean as the sequence numbers increase. As a consequence, the
+ * open loss interval I_0 increases, hence p = W_tot/max(I_tot0, I_tot1)
+ * decreases, and thus there is no need to send renewed feedback.
  */
-u8 tfrc_lh_update_i_mean(struct tfrc_loss_hist *lh, struct sk_buff *skb)
+void tfrc_lh_update_i_mean(struct tfrc_loss_hist *lh, struct sk_buff *skb)
 {
         struct tfrc_loss_interval *cur = tfrc_lh_peek(lh);
-        u32 old_i_mean = lh->i_mean;
         s64 len;
 
         if (cur == NULL)                        /* not initialised */
-                return 0;
+                return;
+
+        /* FIXME: should probably also count non-data packets (RFC 4342, 6.1) */
+        if (!dccp_data_packet(skb))
+                return;
 
         len = dccp_delta_seqno(cur->li_seqno, DCCP_SKB_CB(skb)->dccpd_seq) + 1;
 
         if (len - (s64)cur->li_length <= 0)     /* duplicate or reordered */
-                return 0;
+                return;
 
         if (SUB16(dccp_hdr(skb)->dccph_ccval, cur->li_ccval) > 4)
                 /*
@@ -114,14 +119,11 @@ u8 tfrc_lh_update_i_mean(struct tfrc_loss_hist *lh, struct sk_buff *skb)
                 cur->li_is_closed = 1;
 
         if (tfrc_lh_length(lh) == 1)            /* due to RFC 3448, 6.3.1 */
-                return 0;
+                return;
 
         cur->li_length = len;
         tfrc_lh_calc_i_mean(lh);
-
-        return (lh->i_mean < old_i_mean);
 }
-EXPORT_SYMBOL_GPL(tfrc_lh_update_i_mean);
 
 /* Determine if `new_loss' does begin a new loss interval [RFC 4342, 10.2] */
 static inline u8 tfrc_lh_is_new_loss(struct tfrc_loss_interval *cur,
@@ -138,18 +140,18 @@ static inline u8 tfrc_lh_is_new_loss(struct tfrc_loss_interval *cur,
  * @sk:            Used by @calc_first_li in caller-specific way (subtyping)
  * Updates I_mean and returns 1 if a new interval has in fact been added to @lh.
  */
-int tfrc_lh_interval_add(struct tfrc_loss_hist *lh, struct tfrc_rx_hist *rh,
-                         u32 (*calc_first_li)(struct sock *), struct sock *sk)
+bool tfrc_lh_interval_add(struct tfrc_loss_hist *lh, struct tfrc_rx_hist *rh,
+                          u32 (*calc_first_li)(struct sock *), struct sock *sk)
 {
         struct tfrc_loss_interval *cur = tfrc_lh_peek(lh), *new;
 
         if (cur != NULL && !tfrc_lh_is_new_loss(cur, tfrc_rx_hist_loss_prev(rh)))
-                return 0;
+                return false;
 
         new = tfrc_lh_demand_next(lh);
         if (unlikely(new == NULL)) {
                 DCCP_CRIT("Cannot allocate/add loss record.");
-                return 0;
+                return false;
         }
 
         new->li_seqno     = tfrc_rx_hist_loss_prev(rh)->tfrchrx_seqno;
@@ -167,7 +169,7 @@ int tfrc_lh_interval_add(struct tfrc_loss_hist *lh, struct tfrc_rx_hist *rh,
 
                 tfrc_lh_calc_i_mean(lh);
         }
-        return 1;
+        return true;
 }
 EXPORT_SYMBOL_GPL(tfrc_lh_interval_add);
 
diff --git a/net/dccp/ccids/lib/loss_interval.h b/net/dccp/ccids/lib/loss_interval.h
index 246018a3b269..d08a226db43e 100644
--- a/net/dccp/ccids/lib/loss_interval.h
+++ b/net/dccp/ccids/lib/loss_interval.h
@@ -67,9 +67,9 @@ static inline u8 tfrc_lh_length(struct tfrc_loss_hist *lh)
 
 struct tfrc_rx_hist;
 
-extern int  tfrc_lh_interval_add(struct tfrc_loss_hist *, struct tfrc_rx_hist *,
+extern bool tfrc_lh_interval_add(struct tfrc_loss_hist *, struct tfrc_rx_hist *,
                                  u32 (*first_li)(struct sock *), struct sock *);
-extern u8   tfrc_lh_update_i_mean(struct tfrc_loss_hist *lh, struct sk_buff *);
+extern void tfrc_lh_update_i_mean(struct tfrc_loss_hist *lh, struct sk_buff *);
 extern void tfrc_lh_cleanup(struct tfrc_loss_hist *lh);
 
 #endif /* _DCCP_LI_HIST_ */
diff --git a/net/dccp/ccids/lib/packet_history.c b/net/dccp/ccids/lib/packet_history.c
index 6cc108afdc3b..cce9f03bda3e 100644
--- a/net/dccp/ccids/lib/packet_history.c
+++ b/net/dccp/ccids/lib/packet_history.c
@@ -40,18 +40,6 @@
 #include "packet_history.h"
 #include "../../dccp.h"
 
-/**
- *  tfrc_tx_hist_entry  -  Simple singly-linked TX history list
- *  @next:  next oldest entry (LIFO order)
- *  @seqno: sequence number of this entry
- *  @stamp: send time of packet with sequence number @seqno
- */
-struct tfrc_tx_hist_entry {
-        struct tfrc_tx_hist_entry *next;
-        u64                       seqno;
-        ktime_t                   stamp;
-};
-
 /*
  * Transmitter History Routines
  */
@@ -73,15 +61,6 @@ void tfrc_tx_packet_history_exit(void)
         }
 }
 
-static struct tfrc_tx_hist_entry *
-        tfrc_tx_hist_find_entry(struct tfrc_tx_hist_entry *head, u64 seqno)
-{
-        while (head != NULL && head->seqno != seqno)
-                head = head->next;
-
-        return head;
-}
-
 int tfrc_tx_hist_add(struct tfrc_tx_hist_entry **headp, u64 seqno)
 {
         struct tfrc_tx_hist_entry *entry = kmem_cache_alloc(tfrc_tx_hist_slab, gfp_any());
@@ -111,25 +90,6 @@ void tfrc_tx_hist_purge(struct tfrc_tx_hist_entry **headp)
 }
 EXPORT_SYMBOL_GPL(tfrc_tx_hist_purge);
 
-u32 tfrc_tx_hist_rtt(struct tfrc_tx_hist_entry *head, const u64 seqno,
-                     const ktime_t now)
-{
-        u32 rtt = 0;
-        struct tfrc_tx_hist_entry *packet = tfrc_tx_hist_find_entry(head, seqno);
-
-        if (packet != NULL) {
-                rtt = ktime_us_delta(now, packet->stamp);
-                /*
-                 * Garbage-collect older (irrelevant) entries:
-                 */
-                tfrc_tx_hist_purge(&packet->next);
-        }
-
-        return rtt;
-}
-EXPORT_SYMBOL_GPL(tfrc_tx_hist_rtt);
-
-
 /*
  *      Receiver History Routines
  */
@@ -191,14 +151,31 @@ int tfrc_rx_hist_duplicate(struct tfrc_rx_hist *h, struct sk_buff *skb)
 }
 EXPORT_SYMBOL_GPL(tfrc_rx_hist_duplicate);
 
+
+static void __tfrc_rx_hist_swap(struct tfrc_rx_hist *h, const u8 a, const u8 b)
+{
+        struct tfrc_rx_hist_entry *tmp = h->ring[a];
+
+        h->ring[a] = h->ring[b];
+        h->ring[b] = tmp;
+}
+
 static void tfrc_rx_hist_swap(struct tfrc_rx_hist *h, const u8 a, const u8 b)
 {
-        const u8 idx_a = tfrc_rx_hist_index(h, a),
-                 idx_b = tfrc_rx_hist_index(h, b);
-        struct tfrc_rx_hist_entry *tmp = h->ring[idx_a];
+        __tfrc_rx_hist_swap(h, tfrc_rx_hist_index(h, a),
+                               tfrc_rx_hist_index(h, b));
+}
 
-        h->ring[idx_a] = h->ring[idx_b];
-        h->ring[idx_b] = tmp;
+/**
+ * tfrc_rx_hist_resume_rtt_sampling  -  Prepare RX history for RTT sampling
+ * This is called after loss detection has finished, when the history entry
+ * with the index of `loss_count' holds the highest-received sequence number.
+ * RTT sampling requires this information at ring[0] (tfrc_rx_hist_sample_rtt).
+ */
+static inline void tfrc_rx_hist_resume_rtt_sampling(struct tfrc_rx_hist *h)
+{
+        __tfrc_rx_hist_swap(h, 0, tfrc_rx_hist_index(h, h->loss_count));
+        h->loss_count = h->loss_start = 0;
 }
 
 /*
@@ -215,10 +192,8 @@ static void __do_track_loss(struct tfrc_rx_hist *h, struct sk_buff *skb, u64 n1)
         u64 s0 = tfrc_rx_hist_loss_prev(h)->tfrchrx_seqno,
             s1 = DCCP_SKB_CB(skb)->dccpd_seq;
 
-        if (!dccp_loss_free(s0, s1, n1)) {      /* gap between S0 and S1 */
+        if (!dccp_loss_free(s0, s1, n1))        /* gap between S0 and S1 */
                 h->loss_count = 1;
-                tfrc_rx_hist_entry_from_skb(tfrc_rx_hist_entry(h, 1), skb, n1);
-        }
 }
 
 static void __one_after_loss(struct tfrc_rx_hist *h, struct sk_buff *skb, u32 n2)
@@ -240,8 +215,7 @@ static void __one_after_loss(struct tfrc_rx_hist *h, struct sk_buff *skb, u32 n2
 
                 if (dccp_loss_free(s2, s1, n1)) {
                         /* hole is filled: S0, S2, and S1 are consecutive */
-                        h->loss_count = 0;
-                        h->loss_start = tfrc_rx_hist_index(h, 1);
+                        tfrc_rx_hist_resume_rtt_sampling(h);
                 } else
                         /* gap between S2 and S1: just update loss_prev */
                         tfrc_rx_hist_entry_from_skb(tfrc_rx_hist_loss_prev(h), skb, n2);
@@ -294,8 +268,7 @@ static int __two_after_loss(struct tfrc_rx_hist *h, struct sk_buff *skb, u32 n3)
 
                         if (dccp_loss_free(s1, s2, n2)) {
                                 /* entire hole filled by S0, S3, S1, S2 */
-                                h->loss_start = tfrc_rx_hist_index(h, 2);
-                                h->loss_count = 0;
+                                tfrc_rx_hist_resume_rtt_sampling(h);
                         } else {
                                 /* gap remains between S1 and S2 */
                                 h->loss_start = tfrc_rx_hist_index(h, 1);
@@ -339,8 +312,7 @@ static void __three_after_loss(struct tfrc_rx_hist *h)
 
                 if (dccp_loss_free(s2, s3, n3)) {
                         /* no gap between S2 and S3: entire hole is filled */
-                        h->loss_start = tfrc_rx_hist_index(h, 3);
-                        h->loss_count = 0;
+                        tfrc_rx_hist_resume_rtt_sampling(h);
                 } else {
                         /* gap between S2 and S3 */
                         h->loss_start = tfrc_rx_hist_index(h, 2);
@@ -354,13 +326,13 @@ static void __three_after_loss(struct tfrc_rx_hist *h)
 }
 
 /**
- *  tfrc_rx_handle_loss  -  Loss detection and further processing
- *  @h:             The non-empty RX history object
- *  @lh:            Loss Intervals database to update
- *  @skb:           Currently received packet
- *  @ndp:           The NDP count belonging to @skb
- *  @calc_first_li: Caller-dependent computation of first loss interval in @lh
- *  @sk:            Used by @calc_first_li (see tfrc_lh_interval_add)
+ *  tfrc_rx_congestion_event  -  Loss detection and further processing
+ *  @h:         The non-empty RX history object
+ *  @lh:        Loss Intervals database to update
+ *  @skb:       Currently received packet
+ *  @ndp:       The NDP count belonging to @skb
+ *  @first_li:  Caller-dependent computation of first loss interval in @lh
+ *  @sk:        Used by @calc_first_li (see tfrc_lh_interval_add)
  *  Chooses action according to pending loss, updates LI database when a new
  *  loss was detected, and does required post-processing. Returns 1 when caller
  *  should send feedback, 0 otherwise.
@@ -368,15 +340,20 @@ static void __three_after_loss(struct tfrc_rx_hist *h)
  *  records accordingly, the caller should not perform any more RX history
  *  operations when loss_count is greater than 0 after calling this function.
  */
-int tfrc_rx_handle_loss(struct tfrc_rx_hist *h,
-                        struct tfrc_loss_hist *lh,
-                        struct sk_buff *skb, const u64 ndp,
-                        u32 (*calc_first_li)(struct sock *), struct sock *sk)
+bool tfrc_rx_congestion_event(struct tfrc_rx_hist *h,
+                              struct tfrc_loss_hist *lh,
+                              struct sk_buff *skb, const u64 ndp,
+                              u32 (*first_li)(struct sock *), struct sock *sk)
 {
-        int is_new_loss = 0;
+        bool new_event = false;
+
+        if (tfrc_rx_hist_duplicate(h, skb))
+                return 0;
 
         if (h->loss_count == 0) {
                 __do_track_loss(h, skb, ndp);
+                tfrc_rx_hist_sample_rtt(h, skb);
+                tfrc_rx_hist_add_packet(h, skb, ndp);
         } else if (h->loss_count == 1) {
                 __one_after_loss(h, skb, ndp);
         } else if (h->loss_count != 2) {
@@ -385,34 +362,57 @@ int tfrc_rx_handle_loss(struct tfrc_rx_hist *h,
                 /*
                  * Update Loss Interval database and recycle RX records
                  */
-                is_new_loss = tfrc_lh_interval_add(lh, h, calc_first_li, sk);
+                new_event = tfrc_lh_interval_add(lh, h, first_li, sk);
                 __three_after_loss(h);
         }
-        return is_new_loss;
+
+        /*
+         * Update moving-average of `s' and the sum of received payload bytes.
+         */
+        if (dccp_data_packet(skb)) {
+                const u32 payload = skb->len - dccp_hdr(skb)->dccph_doff * 4;
+
+                h->packet_size = tfrc_ewma(h->packet_size, payload, 9);
+                h->bytes_recvd += payload;
+        }
+
+        /* RFC 3448, 6.1: update I_0, whose growth implies p <= p_prev */
+        if (!new_event)
+                tfrc_lh_update_i_mean(lh, skb);
+
+        return new_event;
 }
-EXPORT_SYMBOL_GPL(tfrc_rx_handle_loss);
+EXPORT_SYMBOL_GPL(tfrc_rx_congestion_event);
 
-int tfrc_rx_hist_alloc(struct tfrc_rx_hist *h)
+/* Compute the sending rate X_recv measured between feedback intervals */
+u32 tfrc_rx_hist_x_recv(struct tfrc_rx_hist *h, const u32 last_x_recv)
 {
-        int i;
+        u64 bytes = h->bytes_recvd, last_rtt = h->rtt_estimate;
+        s64 delta = ktime_to_us(net_timedelta(h->bytes_start));
 
-        for (i = 0; i <= TFRC_NDUPACK; i++) {
-                h->ring[i] = kmem_cache_alloc(tfrc_rx_hist_slab, GFP_ATOMIC);
-                if (h->ring[i] == NULL)
-                        goto out_free;
-        }
+        WARN_ON(delta <= 0);
+        /*
+         * Ensure that the sampling interval for X_recv is at least one RTT,
+         * by extending the sampling interval backwards in time, over the last
+         * R_(m-1) seconds, as per rfc3448bis-06, 6.2.
+         * To reduce noise (e.g. when the RTT changes often), this is only
+         * done when delta is smaller than RTT/2.
+         */
+        if (last_x_recv > 0 && delta < last_rtt/2) {
+                tfrc_pr_debug("delta < RTT ==> %ld us < %u us\n",
+                              (long)delta, (unsigned)last_rtt);
 
-        h->loss_count = h->loss_start = 0;
-        return 0;
+                delta = (bytes ? delta : 0) + last_rtt;
+                bytes += div_u64((u64)last_x_recv * last_rtt, USEC_PER_SEC);
+        }
 
-out_free:
-        while (i-- != 0) {
-                kmem_cache_free(tfrc_rx_hist_slab, h->ring[i]);
-                h->ring[i] = NULL;
+        if (unlikely(bytes == 0)) {
+                DCCP_WARN("X_recv == 0, using old value of %u\n", last_x_recv);
+                return last_x_recv;
         }
-        return -ENOBUFS;
+        return scaled_div32(bytes, delta);
 }
-EXPORT_SYMBOL_GPL(tfrc_rx_hist_alloc);
+EXPORT_SYMBOL_GPL(tfrc_rx_hist_x_recv);
 
 void tfrc_rx_hist_purge(struct tfrc_rx_hist *h)
 {
@@ -426,73 +426,81 @@ void tfrc_rx_hist_purge(struct tfrc_rx_hist *h)
 }
 EXPORT_SYMBOL_GPL(tfrc_rx_hist_purge);
 
-/**
- * tfrc_rx_hist_rtt_last_s - reference entry to compute RTT samples against
- */
-static inline struct tfrc_rx_hist_entry *
-                        tfrc_rx_hist_rtt_last_s(const struct tfrc_rx_hist *h)
+static int tfrc_rx_hist_alloc(struct tfrc_rx_hist *h)
 {
-        return h->ring[0];
+        int i;
+
+        memset(h, 0, sizeof(*h));
+
+        for (i = 0; i <= TFRC_NDUPACK; i++) {
+                h->ring[i] = kmem_cache_alloc(tfrc_rx_hist_slab, GFP_ATOMIC);
+                if (h->ring[i] == NULL) {
+                        tfrc_rx_hist_purge(h);
+                        return -ENOBUFS;
+                }
+        }
+        return 0;
 }
 
-/**
- * tfrc_rx_hist_rtt_prev_s: previously suitable (wrt rtt_last_s) RTT-sampling entry
- */
-static inline struct tfrc_rx_hist_entry *
-                        tfrc_rx_hist_rtt_prev_s(const struct tfrc_rx_hist *h)
+int tfrc_rx_hist_init(struct tfrc_rx_hist *h, struct sock *sk)
 {
-        return h->ring[h->rtt_sample_prev];
+        if (tfrc_rx_hist_alloc(h))
+                return -ENOBUFS;
+        /*
+         * Initialise first entry with GSR to start loss detection as early as
+         * possible. Code using this must not use any other fields. The entry
+         * will be overwritten once the CCID updates its received packets.
+         */
+        tfrc_rx_hist_loss_prev(h)->tfrchrx_seqno = dccp_sk(sk)->dccps_gsr;
+        return 0;
 }
+EXPORT_SYMBOL_GPL(tfrc_rx_hist_init);
 
 /**
  * tfrc_rx_hist_sample_rtt  -  Sample RTT from timestamp / CCVal
- * Based on ideas presented in RFC 4342, 8.1. Returns 0 if it was not able
- * to compute a sample with given data - calling function should check this.
+ * Based on ideas presented in RFC 4342, 8.1. This function expects that no loss
+ * is pending and uses the following history entries (via rtt_sample_prev):
+ * - h->ring[0]  contains the most recent history entry prior to @skb;
+ * - h->ring[1]  is an unused `dummy' entry when the current difference is 0;
  */
-u32 tfrc_rx_hist_sample_rtt(struct tfrc_rx_hist *h, const struct sk_buff *skb)
+void tfrc_rx_hist_sample_rtt(struct tfrc_rx_hist *h, const struct sk_buff *skb)
 {
-        u32 sample = 0,
-            delta_v = SUB16(dccp_hdr(skb)->dccph_ccval,
-                            tfrc_rx_hist_rtt_last_s(h)->tfrchrx_ccval);
-
-        if (delta_v < 1 || delta_v > 4) {       /* unsuitable CCVal delta */
-                if (h->rtt_sample_prev == 2) {  /* previous candidate stored */
-                        sample = SUB16(tfrc_rx_hist_rtt_prev_s(h)->tfrchrx_ccval,
-                                       tfrc_rx_hist_rtt_last_s(h)->tfrchrx_ccval);
-                        if (sample)
-                                sample = 4 / sample *
-                                         ktime_us_delta(tfrc_rx_hist_rtt_prev_s(h)->tfrchrx_tstamp,
-                                                        tfrc_rx_hist_rtt_last_s(h)->tfrchrx_tstamp);
-                        else    /*
-                                 * FIXME: This condition is in principle not
-                                 * possible but occurs when CCID is used for
-                                 * two-way data traffic. I have tried to trace
-                                 * it, but the cause does not seem to be here.
-                                 */
-                                DCCP_BUG("please report to dccp@vger.kernel.org"
-                                         " => prev = %u, last = %u",
-                                         tfrc_rx_hist_rtt_prev_s(h)->tfrchrx_ccval,
-                                         tfrc_rx_hist_rtt_last_s(h)->tfrchrx_ccval);
-                } else if (delta_v < 1) {
-                        h->rtt_sample_prev = 1;
-                        goto keep_ref_for_next_time;
-                }
+        struct tfrc_rx_hist_entry *last = h->ring[0];
+        u32 sample, delta_v;
 
-        } else if (delta_v == 4) /* optimal match */
-                sample = ktime_to_us(net_timedelta(tfrc_rx_hist_rtt_last_s(h)->tfrchrx_tstamp));
-        else {                   /* suboptimal match */
-                h->rtt_sample_prev = 2;
-                goto keep_ref_for_next_time;
-        }
+        /*
+         * When not to sample:
+         * - on non-data packets
+         *   (RFC 4342, 8.1: CCVal only fully defined for data packets);
+         * - when no data packets have been received yet
+         *   (FIXME: using sampled packet size as indicator here);
+         * - as long as there are gaps in the sequence space (pending loss).
+         */
+        if (!dccp_data_packet(skb) || h->packet_size == 0 ||
+            tfrc_rx_hist_loss_pending(h))
+                return;
 
-        if (unlikely(sample > DCCP_SANE_RTT_MAX)) {
-                DCCP_WARN("RTT sample %u too large, using max\n", sample);
-                sample = DCCP_SANE_RTT_MAX;
+        h->rtt_sample_prev = 0;         /* reset previous candidate */
+
+        delta_v = SUB16(dccp_hdr(skb)->dccph_ccval, last->tfrchrx_ccval);
+        if (delta_v == 0) {             /* less than RTT/4 difference */
+                h->rtt_sample_prev = 1;
+                return;
         }
+        sample = dccp_sane_rtt(ktime_to_us(net_timedelta(last->tfrchrx_tstamp)));
 
-        h->rtt_sample_prev = 0;        /* use current entry as next reference */
-keep_ref_for_next_time:
+        if (delta_v <= 4)               /* between RTT/4 and RTT */
+                sample *= 4 / delta_v;
+        else if (!(sample < h->rtt_estimate && sample > h->rtt_estimate/2))
+                /*
+                * Optimisation: CCVal difference is greater than 1 RTT, yet the
+                * sample is less than the local RTT estimate; which means that
+                * the RTT estimate is too high.
+                * To avoid noise, it is not done if the sample is below RTT/2.
+                */
+                return;
 
-        return sample;
+        /* Use a lower weight than usual to increase responsiveness */
+        h->rtt_estimate = tfrc_ewma(h->rtt_estimate, sample, 5);
 }
 EXPORT_SYMBOL_GPL(tfrc_rx_hist_sample_rtt);
diff --git a/net/dccp/ccids/lib/packet_history.h b/net/dccp/ccids/lib/packet_history.h
index 461cc91cce88..555e65cd73a0 100644
--- a/net/dccp/ccids/lib/packet_history.h
+++ b/net/dccp/ccids/lib/packet_history.h
@@ -40,12 +40,28 @@
 #include <linux/slab.h>
 #include "tfrc.h"
 
-struct tfrc_tx_hist_entry;
+/**
+ *  tfrc_tx_hist_entry  -  Simple singly-linked TX history list
+ *  @next:  next oldest entry (LIFO order)
+ *  @seqno: sequence number of this entry
+ *  @stamp: send time of packet with sequence number @seqno
+ */
+struct tfrc_tx_hist_entry {
+        struct tfrc_tx_hist_entry *next;
+        u64                       seqno;
+        ktime_t                   stamp;
+};
+
+static inline struct tfrc_tx_hist_entry *
+        tfrc_tx_hist_find_entry(struct tfrc_tx_hist_entry *head, u64 seqno)
+{
+        while (head != NULL && head->seqno != seqno)
+                head = head->next;
+        return head;
+}
 
 extern int  tfrc_tx_hist_add(struct tfrc_tx_hist_entry **headp, u64 seqno);
 extern void tfrc_tx_hist_purge(struct tfrc_tx_hist_entry **headp);
-extern u32  tfrc_tx_hist_rtt(struct tfrc_tx_hist_entry *head,
-                             const u64 seqno, const ktime_t now);
 
 /* Subtraction a-b modulo-16, respects circular wrap-around */
 #define SUB16(a, b) (((a) + 16 - (b)) & 0xF)
@@ -75,12 +91,22 @@ struct tfrc_rx_hist_entry {
  * @loss_count:         Number of entries in circular history
  * @loss_start:         Movable index (for loss detection)
  * @rtt_sample_prev:    Used during RTT sampling, points to candidate entry
+ * @rtt_estimate:       Receiver RTT estimate
+ * @packet_size:        Packet size in bytes (as per RFC 3448, 3.1)
+ * @bytes_recvd:        Number of bytes received since @bytes_start
+ * @bytes_start:        Start time for counting @bytes_recvd
  */
 struct tfrc_rx_hist {
         struct tfrc_rx_hist_entry *ring[TFRC_NDUPACK + 1];
         u8                        loss_count:2,
                                   loss_start:2;
+        /* Receiver RTT sampling */
 #define rtt_sample_prev           loss_start
+        u32                       rtt_estimate;
+        /* Receiver sampling of application payload lengths */
+        u32                       packet_size,
+                                  bytes_recvd;
+        ktime_t                   bytes_start;
 };
 
 /**
@@ -124,20 +150,50 @@ static inline bool tfrc_rx_hist_loss_pending(const struct tfrc_rx_hist *h)
         return h->loss_count > 0;
 }
 
+/*
+ * Accessor functions to retrieve parameters sampled by the RX history
+ */
+static inline u32 tfrc_rx_hist_packet_size(const struct tfrc_rx_hist *h)
+{
+        if (h->packet_size == 0) {
+                DCCP_WARN("No sample for s, using fallback\n");
+                return TCP_MIN_RCVMSS;
+        }
+        return h->packet_size;
+
+}
+static inline u32 tfrc_rx_hist_rtt(const struct tfrc_rx_hist *h)
+{
+        if (h->rtt_estimate == 0) {
+                DCCP_WARN("No RTT estimate available, using fallback RTT\n");
+                return  DCCP_FALLBACK_RTT;
+        }
+        return h->rtt_estimate;
+}
+
+static inline void tfrc_rx_hist_restart_byte_counter(struct tfrc_rx_hist *h)
+{
+        h->bytes_recvd = 0;
+        h->bytes_start = ktime_get_real();
+}
+
+extern u32  tfrc_rx_hist_x_recv(struct tfrc_rx_hist *h, const u32 last_x_recv);
+
+
 extern void tfrc_rx_hist_add_packet(struct tfrc_rx_hist *h,
                                     const struct sk_buff *skb, const u64 ndp);
 
 extern int tfrc_rx_hist_duplicate(struct tfrc_rx_hist *h, struct sk_buff *skb);
 
 struct tfrc_loss_hist;
-extern int  tfrc_rx_handle_loss(struct tfrc_rx_hist *h,
-                                struct tfrc_loss_hist *lh,
-                                struct sk_buff *skb, const u64 ndp,
-                                u32 (*first_li)(struct sock *sk),
-                                struct sock *sk);
-extern u32 tfrc_rx_hist_sample_rtt(struct tfrc_rx_hist *h,
-                                   const struct sk_buff *skb);
-extern int tfrc_rx_hist_alloc(struct tfrc_rx_hist *h);
+extern bool tfrc_rx_congestion_event(struct tfrc_rx_hist *h,
+                                     struct tfrc_loss_hist *lh,
+                                     struct sk_buff *skb, const u64 ndp,
+                                     u32 (*first_li)(struct sock *sk),
+                                     struct sock *sk);
+extern void tfrc_rx_hist_sample_rtt(struct tfrc_rx_hist *h,
+                                    const struct sk_buff *skb);
+extern int  tfrc_rx_hist_init(struct tfrc_rx_hist *h, struct sock *sk);
 extern void tfrc_rx_hist_purge(struct tfrc_rx_hist *h);
 
 #endif /* _DCCP_PKT_HIST_ */
diff --git a/net/dccp/ccids/lib/tfrc.h b/net/dccp/ccids/lib/tfrc.h
index ed9857527acf..ede12f53de5a 100644
--- a/net/dccp/ccids/lib/tfrc.h
+++ b/net/dccp/ccids/lib/tfrc.h
@@ -48,6 +48,21 @@ static inline u32 scaled_div32(u64 a, u64 b)
 }
 
 /**
+ * tfrc_scaled_sqrt  -  Compute scaled integer sqrt(x) for 0 < x < 2^22-1
+ * Uses scaling to improve accuracy of the integer approximation of sqrt(). The
+ * scaling factor of 2^10 limits the maximum @sample to 4e6; this is okay for
+ * clamped RTT samples (dccp_sample_rtt).
+ * Should best be used for expressions of type sqrt(x)/sqrt(y), since then the
+ * scaling factor is neutralised. For this purpose, it avoids returning zero.
+ */
+static inline u16 tfrc_scaled_sqrt(const u32 sample)
+{
+        const unsigned long non_zero_sample = sample ? : 1;
+
+        return int_sqrt(non_zero_sample << 10);
+}
+
+/**
  * tfrc_ewma  -  Exponentially weighted moving average
  * @weight: Weight to be used as damping factor, in units of 1/10
  */
@@ -58,6 +73,7 @@ static inline u32 tfrc_ewma(const u32 avg, const u32 newval, const u8 weight)
 
 extern u32  tfrc_calc_x(u16 s, u32 R, u32 p);
 extern u32  tfrc_calc_x_reverse_lookup(u32 fvalue);
+extern u32  tfrc_invert_loss_event_rate(u32 loss_event_rate);
 
 extern int  tfrc_tx_packet_history_init(void);
 extern void tfrc_tx_packet_history_exit(void);
diff --git a/net/dccp/ccids/lib/tfrc_equation.c b/net/dccp/ccids/lib/tfrc_equation.c
index 2f20a29cffe4..38239c4d5e14 100644
--- a/net/dccp/ccids/lib/tfrc_equation.c
+++ b/net/dccp/ccids/lib/tfrc_equation.c
@@ -632,8 +632,16 @@ u32 tfrc_calc_x(u16 s, u32 R, u32 p)
 
         if (p <= TFRC_CALC_X_SPLIT)             {     /* 0.0000 < p <= 0.05   */
                 if (p < TFRC_SMALLEST_P) {            /* 0.0000 < p <  0.0001 */
-                        DCCP_WARN("Value of p (%d) below resolution. "
-                                  "Substituting %d\n", p, TFRC_SMALLEST_P);
+                        /*
+                         * In the congestion-avoidance phase p decays towards 0
+                         * when there are no further losses, so this case is
+                         * natural. Truncating to p_min = 0.01% means that the
+                         * maximum achievable throughput is limited to about
+                         * X_calc_max = 122.4 * s/RTT (see RFC 3448, 3.1); e.g.
+                         * with s=1500 bytes, RTT=0.01 s: X_calc_max = 147 Mbps.
+                         */
+                        tfrc_pr_debug("Value of p (%d) below resolution. "
+                                      "Substituting %d\n", p, TFRC_SMALLEST_P);
                         index = 0;
                 } else                                /* 0.0001 <= p <= 0.05  */
                         index =  p/TFRC_SMALLEST_P - 1;
@@ -658,7 +666,6 @@ u32 tfrc_calc_x(u16 s, u32 R, u32 p)
         result = scaled_div(s, R);
         return scaled_div32(result, f);
 }
-
 EXPORT_SYMBOL_GPL(tfrc_calc_x);
 
 /**
@@ -693,5 +700,19 @@ u32 tfrc_calc_x_reverse_lookup(u32 fvalue)
         index = tfrc_binsearch(fvalue, 0);
         return (index + 1) * 1000000 / TFRC_CALC_X_ARRSIZE;
 }
-
 EXPORT_SYMBOL_GPL(tfrc_calc_x_reverse_lookup);
+
+/**
+ * tfrc_invert_loss_event_rate  -  Compute p so that 10^6 corresponds to 100%
+ * When @loss_event_rate is large, there is a chance that p is truncated to 0.
+ * To avoid re-entering slow-start in that case, we set p = TFRC_SMALLEST_P > 0.
+ */
+u32 tfrc_invert_loss_event_rate(u32 loss_event_rate)
+{
+        if (loss_event_rate == UINT_MAX)                /* see RFC 4342, 8.5 */
+                return 0;
+        if (unlikely(loss_event_rate == 0))             /* map 1/0 into 100% */
+                return 1000000;
+        return max_t(u32, scaled_div(1, loss_event_rate), TFRC_SMALLEST_P);
+}
+EXPORT_SYMBOL_GPL(tfrc_invert_loss_event_rate);
diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index b4bc6e095a0e..5281190aa19c 100644
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -42,9 +42,11 @@
 extern int dccp_debug;
 #define dccp_pr_debug(format, a...)       DCCP_PR_DEBUG(dccp_debug, format, ##a)
 #define dccp_pr_debug_cat(format, a...)   DCCP_PRINTK(dccp_debug, format, ##a)
+#define dccp_debug(fmt, a...)             dccp_pr_debug_cat(KERN_DEBUG fmt, ##a)
 #else
 #define dccp_pr_debug(format, a...)
 #define dccp_pr_debug_cat(format, a...)
+#define dccp_debug(format, a...)
 #endif
 
 extern struct inet_hashinfo dccp_hashinfo;
@@ -61,11 +63,14 @@ extern void dccp_time_wait(struct sock *sk, int state, int timeo);
  *    - DCCP-Reset    with ACK Subheader and 4 bytes of Reset Code fields
  *  Hence a safe upper bound for the maximum option length is 1020-28 = 992
  */
-#define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(int))
+#define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(uint32_t))
 #define DCCP_MAX_PACKET_HDR 28
 #define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR)
 #define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER)
 
+/* Upper bound for initial feature-negotiation overhead (padded to 32 bits) */
+#define DCCP_FEATNEG_OVERHEAD    (32 * sizeof(uint32_t))
+
 #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
                                      * state, about 60 seconds */
 
@@ -81,10 +86,13 @@ extern void dccp_time_wait(struct sock *sk, int state, int timeo);
  */
 #define DCCP_RTO_MAX ((unsigned)(64 * HZ))
 
+/* DCCP base time resolution - 10 microseconds (RFC 4340, 13.1 ... 13.3) */
+#define DCCP_TIME_RESOLUTION    10
+
 /*
  * RTT sampling: sanity bounds and fallback RTT value from RFC 4340, section 3.4
  */
-#define DCCP_SANE_RTT_MIN       100
+#define DCCP_SANE_RTT_MIN       (10 * DCCP_TIME_RESOLUTION)
 #define DCCP_FALLBACK_RTT       (USEC_PER_SEC / 5)
 #define DCCP_SANE_RTT_MAX       (3 * USEC_PER_SEC)
 
@@ -95,12 +103,6 @@ extern void dccp_time_wait(struct sock *sk, int state, int timeo);
 extern int  sysctl_dccp_request_retries;
 extern int  sysctl_dccp_retries1;
 extern int  sysctl_dccp_retries2;
-extern int  sysctl_dccp_feat_sequence_window;
-extern int  sysctl_dccp_feat_rx_ccid;
-extern int  sysctl_dccp_feat_tx_ccid;
-extern int  sysctl_dccp_feat_ack_ratio;
-extern int  sysctl_dccp_feat_send_ack_vector;
-extern int  sysctl_dccp_feat_send_ndp_count;
 extern int  sysctl_dccp_tx_qlen;
 extern int  sysctl_dccp_sync_ratelimit;
 
@@ -235,8 +237,22 @@ extern void dccp_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
 extern void dccp_send_sync(struct sock *sk, const u64 seq,
                            const enum dccp_pkt_type pkt_type);
 
-extern void dccp_write_xmit(struct sock *sk, int block);
+/*
+ * TX Packet Dequeueing Interface
+ */
+extern void             dccp_qpolicy_push(struct sock *sk, struct sk_buff *skb);
+extern bool             dccp_qpolicy_full(struct sock *sk);
+extern void             dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb);
+extern struct sk_buff   *dccp_qpolicy_top(struct sock *sk);
+extern struct sk_buff   *dccp_qpolicy_pop(struct sock *sk);
+extern bool             dccp_qpolicy_param_ok(struct sock *sk, __be32 param);
+
+/*
+ * TX Packet Output and TX Timers
+ */
+extern void dccp_write_xmit(struct sock *sk);
 extern void dccp_write_space(struct sock *sk);
+extern void dccp_flush_write_queue(struct sock *sk, long *time_budget);
 
 extern void dccp_init_xmit_timers(struct sock *sk);
 static inline void dccp_clear_xmit_timers(struct sock *sk)
@@ -252,7 +268,8 @@ extern const char *dccp_state_name(const int state);
 extern void dccp_set_state(struct sock *sk, const int state);
 extern void dccp_done(struct sock *sk);
 
-extern void dccp_reqsk_init(struct request_sock *req, struct sk_buff *skb);
+extern int  dccp_reqsk_init(struct request_sock *rq, struct dccp_sock const *dp,
+                            struct sk_buff const *skb);
 
 extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
 
@@ -317,7 +334,14 @@ extern struct sk_buff *dccp_ctl_make_reset(struct sock *sk,
 extern int         dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
 extern void        dccp_send_close(struct sock *sk, const int active);
 extern int         dccp_invalid_packet(struct sk_buff *skb);
-extern u32         dccp_sample_rtt(struct sock *sk, long delta);
+
+static inline u32  dccp_sane_rtt(long usec_sample)
+{
+        if (unlikely(usec_sample <= 0 || usec_sample > DCCP_SANE_RTT_MAX))
+                DCCP_WARN("RTT sample %ld out of bounds!\n", usec_sample);
+        return clamp_val(usec_sample, DCCP_SANE_RTT_MIN, DCCP_SANE_RTT_MAX);
+}
+extern u32 dccp_sample_rtt(struct sock *sk, long delta);
 
 static inline int dccp_bad_service_code(const struct sock *sk,
                                         const __be32 service)
@@ -411,36 +435,62 @@ static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
 static inline void dccp_update_gsr(struct sock *sk, u64 seq)
 {
         struct dccp_sock *dp = dccp_sk(sk);
-        const struct dccp_minisock *dmsk = dccp_msk(sk);
 
         dp->dccps_gsr = seq;
-        dccp_set_seqno(&dp->dccps_swl,
-                       dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4));
-        dccp_set_seqno(&dp->dccps_swh,
-                       dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4);
+        /* Sequence validity window depends on remote Sequence Window (7.5.1) */
+        dp->dccps_swl = SUB48(ADD48(dp->dccps_gsr, 1), dp->dccps_r_seq_win / 4);
+        /*
+         * Adjust SWL so that it is not below ISR. In contrast to RFC 4340,
+         * 7.5.1 we perform this check beyond the initial handshake: W/W' are
+         * always > 32, so for the first W/W' packets in the lifetime of a
+         * connection we always have to adjust SWL.
+         * A second reason why we are doing this is that the window depends on
+         * the feature-remote value of Sequence Window: nothing stops the peer
+         * from updating this value while we are busy adjusting SWL for the
+         * first W packets (we would have to count from scratch again then).
+         * Therefore it is safer to always make sure that the Sequence Window
+         * is not artificially extended by a peer who grows SWL downwards by
+         * continually updating the feature-remote Sequence-Window.
+         * If sequence numbers wrap it is bad luck. But that will take a while
+         * (48 bit), and this measure prevents Sequence-number attacks.
+         */
+        if (before48(dp->dccps_swl, dp->dccps_isr))
+                dp->dccps_swl = dp->dccps_isr;
+        dp->dccps_swh = ADD48(dp->dccps_gsr, (3 * dp->dccps_r_seq_win) / 4);
 }
 
 static inline void dccp_update_gss(struct sock *sk, u64 seq)
 {
         struct dccp_sock *dp = dccp_sk(sk);
 
-        dp->dccps_awh = dp->dccps_gss = seq;
-        dccp_set_seqno(&dp->dccps_awl,
-                       (dp->dccps_gss -
-                        dccp_msk(sk)->dccpms_sequence_window + 1));
+        dp->dccps_gss = seq;
+        /* Ack validity window depends on local Sequence Window value (7.5.1) */
+        dp->dccps_awl = SUB48(ADD48(dp->dccps_gss, 1), dp->dccps_l_seq_win);
+        /* Adjust AWL so that it is not below ISS - see comment above for SWL */
+        if (before48(dp->dccps_awl, dp->dccps_iss))
+                dp->dccps_awl = dp->dccps_iss;
+        dp->dccps_awh = dp->dccps_gss;
+}
+
+static inline int dccp_ackvec_pending(const struct sock *sk)
+{
+        return dccp_sk(sk)->dccps_hc_rx_ackvec != NULL &&
+               !dccp_ackvec_is_empty(dccp_sk(sk)->dccps_hc_rx_ackvec);
 }
 
 static inline int dccp_ack_pending(const struct sock *sk)
 {
-        const struct dccp_sock *dp = dccp_sk(sk);
-        return dp->dccps_timestamp_echo != 0 ||
-#ifdef CONFIG_IP_DCCP_ACKVEC
-               (dccp_msk(sk)->dccpms_send_ack_vector &&
-                dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
-#endif
-               inet_csk_ack_scheduled(sk);
+        return dccp_ackvec_pending(sk) || inet_csk_ack_scheduled(sk);
 }
 
+extern int  dccp_feat_signal_nn_change(struct sock *sk, u8 feat, u64 nn_val);
+extern int  dccp_feat_finalise_settings(struct dccp_sock *dp);
+extern int  dccp_feat_server_ccid_dependencies(struct dccp_request_sock *dreq);
+extern int  dccp_feat_insert_opts(struct dccp_sock*, struct dccp_request_sock*,
+                                  struct sk_buff *skb);
+extern int  dccp_feat_activate_values(struct sock *sk, struct list_head *fn);
+extern void dccp_feat_list_purge(struct list_head *fn_list);
+
 extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
 extern int dccp_insert_options_rsk(struct dccp_request_sock*, struct sk_buff*);
 extern int dccp_insert_option_elapsed_time(struct sock *sk,
diff --git a/net/dccp/diag.c b/net/dccp/diag.c
index d8a3509b26f6..93aae7c95550 100644
--- a/net/dccp/diag.c
+++ b/net/dccp/diag.c
@@ -29,7 +29,7 @@ static void dccp_get_info(struct sock *sk, struct tcp_info *info)
         info->tcpi_backoff      = icsk->icsk_backoff;
         info->tcpi_pmtu         = icsk->icsk_pmtu_cookie;
 
-        if (dccp_msk(sk)->dccpms_send_ack_vector)
+        if (dp->dccps_hc_rx_ackvec != NULL)
                 info->tcpi_options |= TCPI_OPT_SACK;
 
         ccid_hc_rx_get_info(dp->dccps_hc_rx_ccid, sk, info);
diff --git a/net/dccp/feat.c b/net/dccp/feat.c
index 933a0ecf8d46..f94c7c9d1a7f 100644
--- a/net/dccp/feat.c
+++ b/net/dccp/feat.c
@@ -1,11 +1,19 @@
 /*
  *  net/dccp/feat.c
  *
- *  An implementation of the DCCP protocol
- *  Andrea Bittau <a.bittau@cs.ucl.ac.uk>
+ *  Feature negotiation for the DCCP protocol (RFC 4340, section 6)
+ *
+ *  Copyright (c) 2008 The University of Aberdeen, Scotland, UK
+ *  Copyright (c) 2008 Gerrit Renker <gerrit@erg.abdn.ac.uk>
+ *  Rewrote from scratch, some bits from earlier code by
+ *  Copyright (c) 2005 Andrea Bittau <a.bittau@cs.ucl.ac.uk>
+ *
  *
  *  ASSUMPTIONS
  *  -----------
+ *  o Feature negotiation is coordinated with connection setup (as in TCP), wild
+ *    changes of parameters of an established connection are not supported.
+ *  o Changing NN values (Ack Ratio only) is supported in state OPEN/PARTOPEN.
  *  o All currently known SP features have 1-byte quantities. If in the future
  *    extensions of RFCs 4340..42 define features with item lengths larger than
  *    one byte, a feature-specific extension of the code will be required.
@@ -15,635 +23,1510 @@
  *  as published by the Free Software Foundation; either version
  *  2 of the License, or (at your option) any later version.
  */
-
 #include <linux/module.h>
-
 #include "ccid.h"
 #include "feat.h"
 
-#define DCCP_FEAT_SP_NOAGREE (-123)
-
-int dccp_feat_change(struct dccp_minisock *dmsk, u8 type, u8 feature,
-                     u8 *val, u8 len, gfp_t gfp)
-{
-        struct dccp_opt_pend *opt;
-
-        dccp_feat_debug(type, feature, *val);
-
-        if (len > 3) {
-                DCCP_WARN("invalid length %d\n", len);
-                return -EINVAL;
-        }
-        /* XXX add further sanity checks */
-
-        /* check if that feature is already being negotiated */
-        list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
-                /* ok we found a negotiation for this option already */
-                if (opt->dccpop_feat == feature && opt->dccpop_type == type) {
-                        dccp_pr_debug("Replacing old\n");
-                        /* replace */
-                        BUG_ON(opt->dccpop_val == NULL);
-                        kfree(opt->dccpop_val);
-                        opt->dccpop_val  = val;
-                        opt->dccpop_len  = len;
-                        opt->dccpop_conf = 0;
-                        return 0;
-                }
-        }
-
-        /* negotiation for a new feature */
-        opt = kmalloc(sizeof(*opt), gfp);
-        if (opt == NULL)
-                return -ENOMEM;
-
-        opt->dccpop_type = type;
-        opt->dccpop_feat = feature;
-        opt->dccpop_len  = len;
-        opt->dccpop_val  = val;
-        opt->dccpop_conf = 0;
-        opt->dccpop_sc   = NULL;
-
-        BUG_ON(opt->dccpop_val == NULL);
-
-        list_add_tail(&opt->dccpop_node, &dmsk->dccpms_pending);
-        return 0;
-}
+/* feature-specific sysctls - initialised to the defaults from RFC 4340, 6.4 */
+unsigned long   sysctl_dccp_sequence_window __read_mostly = 100;
+int             sysctl_dccp_rx_ccid         __read_mostly = 2,
+                sysctl_dccp_tx_ccid         __read_mostly = 2;
 
-EXPORT_SYMBOL_GPL(dccp_feat_change);
-
-static int dccp_feat_update_ccid(struct sock *sk, u8 type, u8 new_ccid_nr)
+/*
+ * Feature activation handlers.
+ *
+ * These all use an u64 argument, to provide enough room for NN/SP features. At
+ * this stage the negotiated values have been checked to be within their range.
+ */
+static int dccp_hdlr_ccid(struct sock *sk, u64 ccid, bool rx)
 {
         struct dccp_sock *dp = dccp_sk(sk);
-        struct dccp_minisock *dmsk = dccp_msk(sk);
-        /* figure out if we are changing our CCID or the peer's */
-        const int rx = type == DCCPO_CHANGE_R;
-        const u8 ccid_nr = rx ? dmsk->dccpms_rx_ccid : dmsk->dccpms_tx_ccid;
-        struct ccid *new_ccid;
-
-        /* Check if nothing is being changed. */
-        if (ccid_nr == new_ccid_nr)
-                return 0;
+        struct ccid *new_ccid = ccid_new(ccid, sk, rx, gfp_any());
 
-        new_ccid = ccid_new(new_ccid_nr, sk, rx, GFP_ATOMIC);
         if (new_ccid == NULL)
                 return -ENOMEM;
 
         if (rx) {
                 ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk);
                 dp->dccps_hc_rx_ccid = new_ccid;
-                dmsk->dccpms_rx_ccid = new_ccid_nr;
         } else {
                 ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk);
                 dp->dccps_hc_tx_ccid = new_ccid;
-                dmsk->dccpms_tx_ccid = new_ccid_nr;
         }
-
         return 0;
 }
 
-static int dccp_feat_update(struct sock *sk, u8 type, u8 feat, u8 val)
+static int dccp_hdlr_seq_win(struct sock *sk, u64 seq_win, bool rx)
 {
-        dccp_feat_debug(type, feat, val);
+        struct dccp_sock *dp = dccp_sk(sk);
 
-        switch (feat) {
-        case DCCPF_CCID:
-                return dccp_feat_update_ccid(sk, type, val);
-        default:
-                dccp_pr_debug("UNIMPLEMENTED: %s(%d, ...)\n",
-                              dccp_feat_typename(type), feat);
-                break;
+        if (rx) {
+                dp->dccps_r_seq_win = seq_win;
+                /* propagate changes to update SWL/SWH */
+                dccp_update_gsr(sk, dp->dccps_gsr);
+        } else {
+                dp->dccps_l_seq_win = seq_win;
+                /* propagate changes to update AWL */
+                dccp_update_gss(sk, dp->dccps_gss);
         }
         return 0;
 }
 
-static int dccp_feat_reconcile(struct sock *sk, struct dccp_opt_pend *opt,
-                               u8 *rpref, u8 rlen)
+static int dccp_hdlr_ack_ratio(struct sock *sk, u64 ratio, bool rx)
+{
+#ifndef __CCID2_COPES_GRACEFULLY_WITH_DYNAMIC_ACK_RATIO_UPDATES__
+        /*
+         * FIXME: This is required until several problems in the CCID-2 code are
+         * resolved. The CCID-2 code currently does not cope well; using dynamic
+         * Ack Ratios greater than 1 caused instabilities. These were manifest
+         * in hangups and long RTO timeouts (1...3 seconds). Until this has been
+         * stabilised, it is safer not to activate dynamic Ack Ratio changes.
+         */
+        dccp_pr_debug("Not changing %s Ack Ratio from 1 to %u\n",
+                      rx ? "RX" : "TX", (u16)ratio);
+        ratio = 1;
+#endif
+        if (rx)
+                dccp_sk(sk)->dccps_r_ack_ratio = ratio;
+        else
+                dccp_sk(sk)->dccps_l_ack_ratio = ratio;
+        return 0;
+}
+
+static int dccp_hdlr_ackvec(struct sock *sk, u64 enable, bool rx)
 {
         struct dccp_sock *dp = dccp_sk(sk);
-        u8 *spref, slen, *res = NULL;
-        int i, j, rc, agree = 1;
 
-        BUG_ON(rpref == NULL);
+        if (rx) {
+                if (enable && dp->dccps_hc_rx_ackvec == NULL) {
+                        dp->dccps_hc_rx_ackvec = dccp_ackvec_alloc(gfp_any());
+                        if (dp->dccps_hc_rx_ackvec == NULL)
+                                return -ENOMEM;
+                } else if (!enable) {
+                        dccp_ackvec_free(dp->dccps_hc_rx_ackvec);
+                        dp->dccps_hc_rx_ackvec = NULL;
+                }
+        }
+        return 0;
+}
 
-        /* check if we are the black sheep */
-        if (dp->dccps_role == DCCP_ROLE_CLIENT) {
-                spref = rpref;
-                slen  = rlen;
-                rpref = opt->dccpop_val;
-                rlen  = opt->dccpop_len;
-        } else {
-                spref = opt->dccpop_val;
-                slen  = opt->dccpop_len;
+static int dccp_hdlr_ndp(struct sock *sk, u64 enable, bool rx)
+{
+        if (!rx)
+                dccp_sk(sk)->dccps_send_ndp_count = (enable > 0);
+        return 0;
+}
+
+/*
+ * Minimum Checksum Coverage is located at the RX side (9.2.1). This means that
+ * `rx' holds when the sending peer informs about his partial coverage via a
+ * ChangeR() option. In the other case, we are the sender and the receiver
+ * announces its coverage via ChangeL() options. The policy here is to honour
+ * such communication by enabling the corresponding partial coverage - but only
+ * if it has not been set manually before; the warning here means that all
+ * packets will be dropped.
+ */
+static int dccp_hdlr_min_cscov(struct sock *sk, u64 cscov, bool rx)
+{
+        struct dccp_sock *dp = dccp_sk(sk);
+
+        if (rx)
+                dp->dccps_pcrlen = cscov;
+        else {
+                if (dp->dccps_pcslen == 0)
+                        dp->dccps_pcslen = cscov;
+                else if (cscov > dp->dccps_pcslen)
+                        DCCP_WARN("CsCov %u too small, peer requires >= %u\n",
+                                  dp->dccps_pcslen, (u8)cscov);
         }
+        return 0;
+}
+
+static const struct {
+        u8                      feat_num;               /* DCCPF_xxx */
+        enum dccp_feat_type     rxtx;                   /* RX or TX  */
+        enum dccp_feat_type     reconciliation;         /* SP or NN  */
+        u8                      default_value;          /* as in 6.4 */
+        int (*activation_hdlr)(struct sock *sk, u64 val, bool rx);
+/*
+ *    Lookup table for location and type of features (from RFC 4340/4342)
+ *  +--------------------------+----+-----+----+----+---------+-----------+
+ *  | Feature                  | Location | Reconc. | Initial |  Section  |
+ *  |                          | RX | TX  | SP | NN |  Value  | Reference |
+ *  +--------------------------+----+-----+----+----+---------+-----------+
+ *  | DCCPF_CCID               |    |  X  | X  |    |   2     | 10        |
+ *  | DCCPF_SHORT_SEQNOS       |    |  X  | X  |    |   0     |  7.6.1    |
+ *  | DCCPF_SEQUENCE_WINDOW    |    |  X  |    | X  | 100     |  7.5.2    |
+ *  | DCCPF_ECN_INCAPABLE      | X  |     | X  |    |   0     | 12.1      |
+ *  | DCCPF_ACK_RATIO          |    |  X  |    | X  |   2     | 11.3      |
+ *  | DCCPF_SEND_ACK_VECTOR    | X  |     | X  |    |   0     | 11.5      |
+ *  | DCCPF_SEND_NDP_COUNT     |    |  X  | X  |    |   0     |  7.7.2    |
+ *  | DCCPF_MIN_CSUM_COVER     | X  |     | X  |    |   0     |  9.2.1    |
+ *  | DCCPF_DATA_CHECKSUM      | X  |     | X  |    |   0     |  9.3.1    |
+ *  | DCCPF_SEND_LEV_RATE      | X  |     | X  |    |   0     | 4342/8.4  |
+ *  +--------------------------+----+-----+----+----+---------+-----------+
+ */
+} dccp_feat_table[] = {
+        { DCCPF_CCID,            FEAT_AT_TX, FEAT_SP, 2,   dccp_hdlr_ccid     },
+        { DCCPF_SHORT_SEQNOS,    FEAT_AT_TX, FEAT_SP, 0,   NULL },
+        { DCCPF_SEQUENCE_WINDOW, FEAT_AT_TX, FEAT_NN, 100, dccp_hdlr_seq_win  },
+        { DCCPF_ECN_INCAPABLE,   FEAT_AT_RX, FEAT_SP, 0,   NULL },
+        { DCCPF_ACK_RATIO,       FEAT_AT_TX, FEAT_NN, 2,   dccp_hdlr_ack_ratio},
+        { DCCPF_SEND_ACK_VECTOR, FEAT_AT_RX, FEAT_SP, 0,   dccp_hdlr_ackvec   },
+        { DCCPF_SEND_NDP_COUNT,  FEAT_AT_TX, FEAT_SP, 0,   dccp_hdlr_ndp      },
+        { DCCPF_MIN_CSUM_COVER,  FEAT_AT_RX, FEAT_SP, 0,   dccp_hdlr_min_cscov},
+        { DCCPF_DATA_CHECKSUM,   FEAT_AT_RX, FEAT_SP, 0,   NULL },
+        { DCCPF_SEND_LEV_RATE,   FEAT_AT_RX, FEAT_SP, 0,   NULL },
+};
+#define DCCP_FEAT_SUPPORTED_MAX         ARRAY_SIZE(dccp_feat_table)
+
+/**
+ * dccp_feat_index  -  Hash function to map feature number into array position
+ * Returns consecutive array index or -1 if the feature is not understood.
+ */
+static int dccp_feat_index(u8 feat_num)
+{
+        /* The first 9 entries are occupied by the types from RFC 4340, 6.4 */
+        if (feat_num > DCCPF_RESERVED && feat_num <= DCCPF_DATA_CHECKSUM)
+                return feat_num - 1;
+
         /*
-         * Now we have server preference list in spref and client preference in
-         * rpref
+         * Other features: add cases for new feature types here after adding
+         * them to the above table.
          */
-        BUG_ON(spref == NULL);
-        BUG_ON(rpref == NULL);
+        switch (feat_num) {
+        case DCCPF_SEND_LEV_RATE:
+                        return DCCP_FEAT_SUPPORTED_MAX - 1;
+        }
+        return -1;
+}
 
-        /* FIXME sanity check vals */
+static u8 dccp_feat_type(u8 feat_num)
+{
+        int idx = dccp_feat_index(feat_num);
 
-        /* Are values in any order?  XXX Lame "algorithm" here */
-        for (i = 0; i < slen; i++) {
-                for (j = 0; j < rlen; j++) {
-                        if (spref[i] == rpref[j]) {
-                                res = &spref[i];
-                                break;
-                        }
-                }
-                if (res)
-                        break;
-        }
+        if (idx < 0)
+                return FEAT_UNKNOWN;
+        return dccp_feat_table[idx].reconciliation;
+}
 
-        /* we didn't agree on anything */
-        if (res == NULL) {
-                /* confirm previous value */
-                switch (opt->dccpop_feat) {
-                case DCCPF_CCID:
-                        /* XXX did i get this right? =P */
-                        if (opt->dccpop_type == DCCPO_CHANGE_L)
-                                res = &dccp_msk(sk)->dccpms_tx_ccid;
-                        else
-                                res = &dccp_msk(sk)->dccpms_rx_ccid;
-                        break;
+static int dccp_feat_default_value(u8 feat_num)
+{
+        int idx = dccp_feat_index(feat_num);
 
-                default:
-                        DCCP_BUG("Fell through, feat=%d", opt->dccpop_feat);
-                        /* XXX implement res */
-                        return -EFAULT;
-                }
+        return idx < 0 ? : dccp_feat_table[idx].default_value;
+}
 
-                dccp_pr_debug("Don't agree... reconfirming %d\n", *res);
-                agree = 0; /* this is used for mandatory options... */
+/*
+ *      Debugging and verbose-printing section
+ */
+static const char *dccp_feat_fname(const u8 feat)
+{
+        static const char *feature_names[] = {
+                [DCCPF_RESERVED]        = "Reserved",
+                [DCCPF_CCID]            = "CCID",
+                [DCCPF_SHORT_SEQNOS]    = "Allow Short Seqnos",
+                [DCCPF_SEQUENCE_WINDOW] = "Sequence Window",
+                [DCCPF_ECN_INCAPABLE]   = "ECN Incapable",
+                [DCCPF_ACK_RATIO]       = "Ack Ratio",
+                [DCCPF_SEND_ACK_VECTOR] = "Send ACK Vector",
+                [DCCPF_SEND_NDP_COUNT]  = "Send NDP Count",
+                [DCCPF_MIN_CSUM_COVER]  = "Min. Csum Coverage",
+                [DCCPF_DATA_CHECKSUM]   = "Send Data Checksum",
+        };
+        if (feat > DCCPF_DATA_CHECKSUM && feat < DCCPF_MIN_CCID_SPECIFIC)
+                return feature_names[DCCPF_RESERVED];
+
+        if (feat ==  DCCPF_SEND_LEV_RATE)
+                return "Send Loss Event Rate";
+        if (feat >= DCCPF_MIN_CCID_SPECIFIC)
+                return "CCID-specific";
+
+        return feature_names[feat];
+}
+
+static const char *dccp_feat_sname[] = { "DEFAULT", "INITIALISING", "CHANGING",
+                                         "UNSTABLE", "STABLE" };
+
+#ifdef CONFIG_IP_DCCP_DEBUG
+static const char *dccp_feat_oname(const u8 opt)
+{
+        switch (opt) {
+        case DCCPO_CHANGE_L:  return "Change_L";
+        case DCCPO_CONFIRM_L: return "Confirm_L";
+        case DCCPO_CHANGE_R:  return "Change_R";
+        case DCCPO_CONFIRM_R: return "Confirm_R";
         }
+        return NULL;
+}
 
-        /* need to put result and our preference list */
-        rlen = 1 + opt->dccpop_len;
-        rpref = kmalloc(rlen, GFP_ATOMIC);
-        if (rpref == NULL)
-                return -ENOMEM;
+static void dccp_feat_printval(u8 feat_num, dccp_feat_val const *val)
+{
+        u8 i, type = dccp_feat_type(feat_num);
+
+        if (val == NULL || (type == FEAT_SP && val->sp.vec == NULL))
+                dccp_pr_debug_cat("(NULL)");
+        else if (type == FEAT_SP)
+                for (i = 0; i < val->sp.len; i++)
+                        dccp_pr_debug_cat("%s%u", i ? " " : "", val->sp.vec[i]);
+        else if (type == FEAT_NN)
+                dccp_pr_debug_cat("%llu", (unsigned long long)val->nn);
+        else
+                dccp_pr_debug_cat("unknown type %u", type);
+}
+
+static void dccp_feat_printvals(u8 feat_num, u8 *list, u8 len)
+{
+        u8 type = dccp_feat_type(feat_num);
+        dccp_feat_val fval = { .sp.vec = list, .sp.len = len };
+
+        if (type == FEAT_NN)
+                fval.nn = dccp_decode_value_var(list, len);
+        dccp_feat_printval(feat_num, &fval);
+}
+
+static void dccp_feat_print_entry(struct dccp_feat_entry const *entry)
+{
+        dccp_debug("   * %s %s = ", entry->is_local ? "local" : "remote",
+                                    dccp_feat_fname(entry->feat_num));
+        dccp_feat_printval(entry->feat_num, &entry->val);
+        dccp_pr_debug_cat(", state=%s %s\n", dccp_feat_sname[entry->state],
+                          entry->needs_confirm ? "(Confirm pending)" : "");
+}
+
+#define dccp_feat_print_opt(opt, feat, val, len, mandatory)     do {          \
+        dccp_pr_debug("%s(%s, ", dccp_feat_oname(opt), dccp_feat_fname(feat));\
+        dccp_feat_printvals(feat, val, len);                                  \
+        dccp_pr_debug_cat(") %s\n", mandatory ? "!" : "");      } while (0)
+
+#define dccp_feat_print_fnlist(fn_list)  {              \
+        const struct dccp_feat_entry *___entry;         \
+                                                        \
+        dccp_pr_debug("List Dump:\n");                  \
+        list_for_each_entry(___entry, fn_list, node)    \
+                dccp_feat_print_entry(___entry);        \
+}
+#else   /* ! CONFIG_IP_DCCP_DEBUG */
+#define dccp_feat_print_opt(opt, feat, val, len, mandatory)
+#define dccp_feat_print_fnlist(fn_list)
+#endif
 
-        *rpref = *res;
-        memcpy(&rpref[1], opt->dccpop_val, opt->dccpop_len);
+static int __dccp_feat_activate(struct sock *sk, const int idx,
+                                const bool is_local, dccp_feat_val const *fval)
+{
+        bool rx;
+        u64 val;
+
+        if (idx < 0 || idx >= DCCP_FEAT_SUPPORTED_MAX)
+                return -1;
+        if (dccp_feat_table[idx].activation_hdlr == NULL)
+                return 0;
 
-        /* put it in the "confirm queue" */
-        if (opt->dccpop_sc == NULL) {
-                opt->dccpop_sc = kmalloc(sizeof(*opt->dccpop_sc), GFP_ATOMIC);
-                if (opt->dccpop_sc == NULL) {
-                        kfree(rpref);
-                        return -ENOMEM;
+        if (fval == NULL) {
+                val = dccp_feat_table[idx].default_value;
+        } else if (dccp_feat_table[idx].reconciliation == FEAT_SP) {
+                if (fval->sp.vec == NULL) {
+                        /*
+                         * This can happen when an empty Confirm is sent
+                         * for an SP (i.e. known) feature. In this case
+                         * we would be using the default anyway.
+                         */
+                        DCCP_CRIT("Feature #%d undefined: using default", idx);
+                        val = dccp_feat_table[idx].default_value;
+                } else {
+                        val = fval->sp.vec[0];
                 }
         } else {
-                /* recycle the confirm slot */
-                BUG_ON(opt->dccpop_sc->dccpoc_val == NULL);
-                kfree(opt->dccpop_sc->dccpoc_val);
-                dccp_pr_debug("recycling confirm slot\n");
-        }
-        memset(opt->dccpop_sc, 0, sizeof(*opt->dccpop_sc));
-
-        opt->dccpop_sc->dccpoc_val = rpref;
-        opt->dccpop_sc->dccpoc_len = rlen;
-
-        /* update the option on our side [we are about to send the confirm] */
-        rc = dccp_feat_update(sk, opt->dccpop_type, opt->dccpop_feat, *res);
-        if (rc) {
-                kfree(opt->dccpop_sc->dccpoc_val);
-                kfree(opt->dccpop_sc);
-                opt->dccpop_sc = NULL;
-                return rc;
+                val = fval->nn;
         }
 
-        dccp_pr_debug("Will confirm %d\n", *rpref);
+        /* Location is RX if this is a local-RX or remote-TX feature */
+        rx = (is_local == (dccp_feat_table[idx].rxtx == FEAT_AT_RX));
 
-        /* say we want to change to X but we just got a confirm X, suppress our
-         * change
-         */
-        if (!opt->dccpop_conf) {
-                if (*opt->dccpop_val == *res)
-                        opt->dccpop_conf = 1;
-                dccp_pr_debug("won't ask for change of same feature\n");
+        dccp_debug("   -> activating %s %s, %sval=%llu\n", rx ? "RX" : "TX",
+                   dccp_feat_fname(dccp_feat_table[idx].feat_num),
+                   fval ? "" : "default ",  (unsigned long long)val);
+
+        return dccp_feat_table[idx].activation_hdlr(sk, val, rx);
+}
+
+/**
+ * dccp_feat_activate  -  Activate feature value on socket
+ * @sk: fully connected DCCP socket (after handshake is complete)
+ * @feat_num: feature to activate, one of %dccp_feature_numbers
+ * @local: whether local (1) or remote (0) @feat_num is meant
+ * @fval: the value (SP or NN) to activate, or NULL to use the default value
+ * For general use this function is preferable over __dccp_feat_activate().
+ */
+static int dccp_feat_activate(struct sock *sk, u8 feat_num, bool local,
+                              dccp_feat_val const *fval)
+{
+        return __dccp_feat_activate(sk, dccp_feat_index(feat_num), local, fval);
+}
+
+/* Test for "Req'd" feature (RFC 4340, 6.4) */
+static inline int dccp_feat_must_be_understood(u8 feat_num)
+{
+        return  feat_num == DCCPF_CCID || feat_num == DCCPF_SHORT_SEQNOS ||
+                feat_num == DCCPF_SEQUENCE_WINDOW;
+}
+
+/* copy constructor, fval must not already contain allocated memory */
+static int dccp_feat_clone_sp_val(dccp_feat_val *fval, u8 const *val, u8 len)
+{
+        fval->sp.len = len;
+        if (fval->sp.len > 0) {
+                fval->sp.vec = kmemdup(val, len, gfp_any());
+                if (fval->sp.vec == NULL) {
+                        fval->sp.len = 0;
+                        return -ENOBUFS;
+                }
         }
+        return 0;
+}
 
-        return agree ? 0 : DCCP_FEAT_SP_NOAGREE; /* used for mandatory opts */
+static void dccp_feat_val_destructor(u8 feat_num, dccp_feat_val *val)
+{
+        if (unlikely(val == NULL))
+                return;
+        if (dccp_feat_type(feat_num) == FEAT_SP)
+                kfree(val->sp.vec);
+        memset(val, 0, sizeof(*val));
 }
 
-static int dccp_feat_sp(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len)
+static struct dccp_feat_entry *
+              dccp_feat_clone_entry(struct dccp_feat_entry const *original)
 {
-        struct dccp_minisock *dmsk = dccp_msk(sk);
-        struct dccp_opt_pend *opt;
-        int rc = 1;
-        u8 t;
+        struct dccp_feat_entry *new;
+        u8 type = dccp_feat_type(original->feat_num);
 
-        /*
-         * We received a CHANGE.  We gotta match it against our own preference
-         * list.  If we got a CHANGE_R it means it's a change for us, so we need
-         * to compare our CHANGE_L list.
-         */
-        if (type == DCCPO_CHANGE_L)
-                t = DCCPO_CHANGE_R;
-        else
-                t = DCCPO_CHANGE_L;
+        if (type == FEAT_UNKNOWN)
+                return NULL;
 
-        /* find our preference list for this feature */
-        list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
-                if (opt->dccpop_type != t || opt->dccpop_feat != feature)
-                        continue;
+        new = kmemdup(original, sizeof(struct dccp_feat_entry), gfp_any());
+        if (new == NULL)
+                return NULL;
 
-                /* find the winner from the two preference lists */
-                rc = dccp_feat_reconcile(sk, opt, val, len);
-                break;
+        if (type == FEAT_SP && dccp_feat_clone_sp_val(&new->val,
+                                                      original->val.sp.vec,
+                                                      original->val.sp.len)) {
+                kfree(new);
+                return NULL;
         }
+        return new;
+}
 
-        /* We didn't deal with the change.  This can happen if we have no
-         * preference list for the feature.  In fact, it just shouldn't
-         * happen---if we understand a feature, we should have a preference list
-         * with at least the default value.
-         */
-        BUG_ON(rc == 1);
+static void dccp_feat_entry_destructor(struct dccp_feat_entry *entry)
+{
+        if (entry != NULL) {
+                dccp_feat_val_destructor(entry->feat_num, &entry->val);
+                kfree(entry);
+        }
+}
 
-        return rc;
+/*
+ * List management functions
+ *
+ * Feature negotiation lists rely on and maintain the following invariants:
+ * - each feat_num in the list is known, i.e. we know its type and default value
+ * - each feat_num/is_local combination is unique (old entries are overwritten)
+ * - SP values are always freshly allocated
+ * - list is sorted in increasing order of feature number (faster lookup)
+ */
+static struct dccp_feat_entry *dccp_feat_list_lookup(struct list_head *fn_list,
+                                                     u8 feat_num, bool is_local)
+{
+        struct dccp_feat_entry *entry;
+
+        list_for_each_entry(entry, fn_list, node)
+                if (entry->feat_num == feat_num && entry->is_local == is_local)
+                        return entry;
+                else if (entry->feat_num > feat_num)
+                        break;
+        return NULL;
 }
 
-static int dccp_feat_nn(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len)
+/**
+ * dccp_feat_entry_new  -  Central list update routine (called by all others)
+ * @head:  list to add to
+ * @feat:  feature number
+ * @local: whether the local (1) or remote feature with number @feat is meant
+ * This is the only constructor and serves to ensure the above invariants.
+ */
+static struct dccp_feat_entry *
+              dccp_feat_entry_new(struct list_head *head, u8 feat, bool local)
 {
-        struct dccp_opt_pend *opt;
-        struct dccp_minisock *dmsk = dccp_msk(sk);
-        u8 *copy;
-        int rc;
+        struct dccp_feat_entry *entry;
+
+        list_for_each_entry(entry, head, node)
+                if (entry->feat_num == feat && entry->is_local == local) {
+                        dccp_feat_val_destructor(entry->feat_num, &entry->val);
+                        return entry;
+                } else if (entry->feat_num > feat) {
+                        head = &entry->node;
+                        break;
+                }
 
-        /* NN features must be Change L (sec. 6.3.2) */
-        if (type != DCCPO_CHANGE_L) {
-                dccp_pr_debug("received %s for NN feature %d\n",
-                                dccp_feat_typename(type), feature);
-                return -EFAULT;
+        entry = kmalloc(sizeof(*entry), gfp_any());
+        if (entry != NULL) {
+                entry->feat_num = feat;
+                entry->is_local = local;
+                list_add_tail(&entry->node, head);
         }
+        return entry;
+}
 
-        /* XXX sanity check opt val */
+/**
+ * dccp_feat_push_change  -  Add/overwrite a Change option in the list
+ * @fn_list: feature-negotiation list to update
+ * @feat: one of %dccp_feature_numbers
+ * @local: whether local (1) or remote (0) @feat_num is meant
+ * @needs_mandatory: whether to use Mandatory feature negotiation options
+ * @fval: pointer to NN/SP value to be inserted (will be copied)
+ */
+static int dccp_feat_push_change(struct list_head *fn_list, u8 feat, u8 local,
+                                 u8 mandatory, dccp_feat_val *fval)
+{
+        struct dccp_feat_entry *new = dccp_feat_entry_new(fn_list, feat, local);
 
-        /* copy option so we can confirm it */
-        opt = kzalloc(sizeof(*opt), GFP_ATOMIC);
-        if (opt == NULL)
+        if (new == NULL)
                 return -ENOMEM;
 
-        copy = kmemdup(val, len, GFP_ATOMIC);
-        if (copy == NULL) {
-                kfree(opt);
-                return -ENOMEM;
-        }
+        new->feat_num        = feat;
+        new->is_local        = local;
+        new->state           = FEAT_INITIALISING;
+        new->needs_confirm   = 0;
+        new->empty_confirm   = 0;
+        new->val             = *fval;
+        new->needs_mandatory = mandatory;
 
-        opt->dccpop_type = DCCPO_CONFIRM_R; /* NN can only confirm R */
-        opt->dccpop_feat = feature;
-        opt->dccpop_val  = copy;
-        opt->dccpop_len  = len;
+        return 0;
+}
 
-        /* change feature */
-        rc = dccp_feat_update(sk, type, feature, *val);
-        if (rc) {
-                kfree(opt->dccpop_val);
-                kfree(opt);
-                return rc;
-        }
+/**
+ * dccp_feat_push_confirm  -  Add a Confirm entry to the FN list
+ * @fn_list: feature-negotiation list to add to
+ * @feat: one of %dccp_feature_numbers
+ * @local: whether local (1) or remote (0) @feat_num is being confirmed
+ * @fval: pointer to NN/SP value to be inserted or NULL
+ * Returns 0 on success, a Reset code for further processing otherwise.
+ */
+static int dccp_feat_push_confirm(struct list_head *fn_list, u8 feat, u8 local,
+                                  dccp_feat_val *fval)
+{
+        struct dccp_feat_entry *new = dccp_feat_entry_new(fn_list, feat, local);
 
-        dccp_feat_debug(type, feature, *copy);
+        if (new == NULL)
+                return DCCP_RESET_CODE_TOO_BUSY;
 
-        list_add_tail(&opt->dccpop_node, &dmsk->dccpms_conf);
+        new->feat_num        = feat;
+        new->is_local        = local;
+        new->state           = FEAT_STABLE;     /* transition in 6.6.2 */
+        new->needs_confirm   = 1;
+        new->empty_confirm   = (fval == NULL);
+        new->val.nn          = 0;               /* zeroes the whole structure */
+        if (!new->empty_confirm)
+                new->val     = *fval;
+        new->needs_mandatory = 0;
 
         return 0;
 }
 
-static void dccp_feat_empty_confirm(struct dccp_minisock *dmsk,
-                                    u8 type, u8 feature)
+static int dccp_push_empty_confirm(struct list_head *fn_list, u8 feat, u8 local)
 {
-        /* XXX check if other confirms for that are queued and recycle slot */
-        struct dccp_opt_pend *opt = kzalloc(sizeof(*opt), GFP_ATOMIC);
+        return dccp_feat_push_confirm(fn_list, feat, local, NULL);
+}
 
-        if (opt == NULL) {
-                /* XXX what do we do?  Ignoring should be fine.  It's a change
-                 * after all =P
-                 */
-                return;
-        }
+static inline void dccp_feat_list_pop(struct dccp_feat_entry *entry)
+{
+        list_del(&entry->node);
+        dccp_feat_entry_destructor(entry);
+}
 
-        switch (type) {
-        case DCCPO_CHANGE_L:
-                opt->dccpop_type = DCCPO_CONFIRM_R;
-                break;
-        case DCCPO_CHANGE_R:
-                opt->dccpop_type = DCCPO_CONFIRM_L;
-                break;
-        default:
-                DCCP_WARN("invalid type %d\n", type);
-                kfree(opt);
-                return;
+void dccp_feat_list_purge(struct list_head *fn_list)
+{
+        struct dccp_feat_entry *entry, *next;
+
+        list_for_each_entry_safe(entry, next, fn_list, node)
+                dccp_feat_entry_destructor(entry);
+        INIT_LIST_HEAD(fn_list);
+}
+EXPORT_SYMBOL_GPL(dccp_feat_list_purge);
+
+/* generate @to as full clone of @from - @to must not contain any nodes */
+int dccp_feat_clone_list(struct list_head const *from, struct list_head *to)
+{
+        struct dccp_feat_entry *entry, *new;
+
+        INIT_LIST_HEAD(to);
+        list_for_each_entry(entry, from, node) {
+                new = dccp_feat_clone_entry(entry);
+                if (new == NULL)
+                        goto cloning_failed;
+                list_add_tail(&new->node, to);
         }
-        opt->dccpop_feat = feature;
-        opt->dccpop_val  = NULL;
-        opt->dccpop_len  = 0;
+        return 0;
 
-        /* change feature */
-        dccp_pr_debug("Empty %s(%d)\n", dccp_feat_typename(type), feature);
+cloning_failed:
+        dccp_feat_list_purge(to);
+        return -ENOMEM;
+}
 
-        list_add_tail(&opt->dccpop_node, &dmsk->dccpms_conf);
+/**
+ * dccp_feat_valid_nn_length  -  Enforce length constraints on NN options
+ * Length is between 0 and %DCCP_OPTVAL_MAXLEN. Used for outgoing packets only,
+ * incoming options are accepted as long as their values are valid.
+ */
+static u8 dccp_feat_valid_nn_length(u8 feat_num)
+{
+        if (feat_num == DCCPF_ACK_RATIO)        /* RFC 4340, 11.3 and 6.6.8 */
+                return 2;
+        if (feat_num == DCCPF_SEQUENCE_WINDOW)  /* RFC 4340, 7.5.2 and 6.5  */
+                return 6;
+        return 0;
 }
 
-static void dccp_feat_flush_confirm(struct sock *sk)
+static u8 dccp_feat_is_valid_nn_val(u8 feat_num, u64 val)
 {
-        struct dccp_minisock *dmsk = dccp_msk(sk);
-        /* Check if there is anything to confirm in the first place */
-        int yes = !list_empty(&dmsk->dccpms_conf);
+        switch (feat_num) {
+        case DCCPF_ACK_RATIO:
+                return val <= DCCPF_ACK_RATIO_MAX;
+        case DCCPF_SEQUENCE_WINDOW:
+                return val >= DCCPF_SEQ_WMIN && val <= DCCPF_SEQ_WMAX;
+        }
+        return 0;       /* feature unknown - so we can't tell */
+}
 
-        if (!yes) {
-                struct dccp_opt_pend *opt;
+/* check that SP values are within the ranges defined in RFC 4340 */
+static u8 dccp_feat_is_valid_sp_val(u8 feat_num, u8 val)
+{
+        switch (feat_num) {
+        case DCCPF_CCID:
+                return val == DCCPC_CCID2 || val == DCCPC_CCID3;
+        /* Type-check Boolean feature values: */
+        case DCCPF_SHORT_SEQNOS:
+        case DCCPF_ECN_INCAPABLE:
+        case DCCPF_SEND_ACK_VECTOR:
+        case DCCPF_SEND_NDP_COUNT:
+        case DCCPF_DATA_CHECKSUM:
+        case DCCPF_SEND_LEV_RATE:
+                return val < 2;
+        case DCCPF_MIN_CSUM_COVER:
+                return val < 16;
+        }
+        return 0;                       /* feature unknown */
+}
+
+static u8 dccp_feat_sp_list_ok(u8 feat_num, u8 const *sp_list, u8 sp_len)
+{
+        if (sp_list == NULL || sp_len < 1)
+                return 0;
+        while (sp_len--)
+                if (!dccp_feat_is_valid_sp_val(feat_num, *sp_list++))
+                        return 0;
+        return 1;
+}
 
-                list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
-                        if (opt->dccpop_conf) {
-                                yes = 1;
-                                break;
+/**
+ * dccp_feat_insert_opts  -  Generate FN options from current list state
+ * @skb: next sk_buff to be sent to the peer
+ * @dp: for client during handshake and general negotiation
+ * @dreq: used by the server only (all Changes/Confirms in LISTEN/RESPOND)
+ */
+int dccp_feat_insert_opts(struct dccp_sock *dp, struct dccp_request_sock *dreq,
+                          struct sk_buff *skb)
+{
+        struct list_head *fn = dreq ? &dreq->dreq_featneg : &dp->dccps_featneg;
+        struct dccp_feat_entry *pos, *next;
+        u8 opt, type, len, *ptr, nn_in_nbo[DCCP_OPTVAL_MAXLEN];
+        bool rpt;
+
+        /* put entries into @skb in the order they appear in the list */
+        list_for_each_entry_safe_reverse(pos, next, fn, node) {
+                opt  = dccp_feat_genopt(pos);
+                type = dccp_feat_type(pos->feat_num);
+                rpt  = false;
+
+                if (pos->empty_confirm) {
+                        len = 0;
+                        ptr = NULL;
+                } else {
+                        if (type == FEAT_SP) {
+                                len = pos->val.sp.len;
+                                ptr = pos->val.sp.vec;
+                                rpt = pos->needs_confirm;
+                        } else if (type == FEAT_NN) {
+                                len = dccp_feat_valid_nn_length(pos->feat_num);
+                                ptr = nn_in_nbo;
+                                dccp_encode_value_var(pos->val.nn, ptr, len);
+                        } else {
+                                DCCP_BUG("unknown feature %u", pos->feat_num);
+                                return -1;
                         }
                 }
+                dccp_feat_print_opt(opt, pos->feat_num, ptr, len, 0);
+
+                if (dccp_insert_fn_opt(skb, opt, pos->feat_num, ptr, len, rpt))
+                        return -1;
+                if (pos->needs_mandatory && dccp_insert_option_mandatory(skb))
+                        return -1;
+                /*
+                 * Enter CHANGING after transmitting the Change option (6.6.2).
+                 */
+                if (pos->state == FEAT_INITIALISING)
+                        pos->state = FEAT_CHANGING;
         }
+        return 0;
+}
 
-        if (!yes)
-                return;
+/**
+ * __feat_register_nn  -  Register new NN value on socket
+ * @fn: feature-negotiation list to register with
+ * @feat: an NN feature from %dccp_feature_numbers
+ * @mandatory: use Mandatory option if 1
+ * @nn_val: value to register (restricted to 4 bytes)
+ * Note that NN features are local by definition (RFC 4340, 6.3.2).
+ */
+static int __feat_register_nn(struct list_head *fn, u8 feat,
+                              u8 mandatory, u64 nn_val)
+{
+        dccp_feat_val fval = { .nn = nn_val };
 
-        /* OK there is something to confirm... */
-        /* XXX check if packet is in flight?  Send delayed ack?? */
-        if (sk->sk_state == DCCP_OPEN)
-                dccp_send_ack(sk);
+        if (dccp_feat_type(feat) != FEAT_NN ||
+            !dccp_feat_is_valid_nn_val(feat, nn_val))
+                return -EINVAL;
+
+        /* Don't bother with default values, they will be activated anyway. */
+        if (nn_val - (u64)dccp_feat_default_value(feat) == 0)
+                return 0;
+
+        return dccp_feat_push_change(fn, feat, 1, mandatory, &fval);
 }
 
-int dccp_feat_change_recv(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len)
+/**
+ * __feat_register_sp  -  Register new SP value/list on socket
+ * @fn: feature-negotiation list to register with
+ * @feat: an SP feature from %dccp_feature_numbers
+ * @is_local: whether the local (1) or the remote (0) @feat is meant
+ * @mandatory: use Mandatory option if 1
+ * @sp_val: SP value followed by optional preference list
+ * @sp_len: length of @sp_val in bytes
+ */
+static int __feat_register_sp(struct list_head *fn, u8 feat, u8 is_local,
+                              u8 mandatory, u8 const *sp_val, u8 sp_len)
 {
-        int rc;
+        dccp_feat_val fval;
 
-        dccp_feat_debug(type, feature, *val);
+        if (dccp_feat_type(feat) != FEAT_SP ||
+            !dccp_feat_sp_list_ok(feat, sp_val, sp_len))
+                return -EINVAL;
 
-        /* figure out if it's SP or NN feature */
-        switch (feature) {
-        /* deal with SP features */
-        case DCCPF_CCID:
-                rc = dccp_feat_sp(sk, type, feature, val, len);
-                break;
+        /* Avoid negotiating alien CCIDs by only advertising supported ones */
+        if (feat == DCCPF_CCID && !ccid_support_check(sp_val, sp_len))
+                return -EOPNOTSUPP;
 
-        /* deal with NN features */
-        case DCCPF_ACK_RATIO:
-                rc = dccp_feat_nn(sk, type, feature, val, len);
-                break;
+        if (dccp_feat_clone_sp_val(&fval, sp_val, sp_len))
+                return -ENOMEM;
 
-        /* XXX implement other features */
-        default:
-                dccp_pr_debug("UNIMPLEMENTED: not handling %s(%d, ...)\n",
-                              dccp_feat_typename(type), feature);
-                rc = -EFAULT;
-                break;
+        return dccp_feat_push_change(fn, feat, is_local, mandatory, &fval);
+}
+
+/**
+ * dccp_feat_register_sp  -  Register requests to change SP feature values
+ * @sk: client or listening socket
+ * @feat: one of %dccp_feature_numbers
+ * @is_local: whether the local (1) or remote (0) @feat is meant
+ * @list: array of preferred values, in descending order of preference
+ * @len: length of @list in bytes
+ */
+int dccp_feat_register_sp(struct sock *sk, u8 feat, u8 is_local,
+                          u8 const *list, u8 len)
+{        /* any changes must be registered before establishing the connection */
+        if (sk->sk_state != DCCP_CLOSED)
+                return -EISCONN;
+        if (dccp_feat_type(feat) != FEAT_SP)
+                return -EINVAL;
+        return __feat_register_sp(&dccp_sk(sk)->dccps_featneg, feat, is_local,
+                                  0, list, len);
+}
+
+/* Analogous to dccp_feat_register_sp(), but for non-negotiable values */
+int dccp_feat_register_nn(struct sock *sk, u8 feat, u64 val)
+{
+        /* any changes must be registered before establishing the connection */
+        if (sk->sk_state != DCCP_CLOSED)
+                return -EISCONN;
+        if (dccp_feat_type(feat) != FEAT_NN)
+                return -EINVAL;
+        return __feat_register_nn(&dccp_sk(sk)->dccps_featneg, feat, 0, val);
+}
+
+/**
+ * dccp_feat_signal_nn_change  -  Update NN values for an established connection
+ * @sk: DCCP socket of an established connection
+ * @feat: NN feature number from %dccp_feature_numbers
+ * @nn_val: the new value to use
+ * This function is used to communicate NN updates out-of-band. The difference
+ * to feature negotiation during connection setup is that values are activated
+ * immediately after validation, i.e. we don't wait for the Confirm: either the
+ * value is accepted by the peer (and then the waiting is futile), or it is not
+ * (Reset or empty Confirm). We don't accept empty Confirms - transmitted values
+ * are validated, and the peer "MUST accept any valid value" (RFC 4340, 6.3.2).
+ */
+int dccp_feat_signal_nn_change(struct sock *sk, u8 feat, u64 nn_val)
+{
+        struct list_head *fn = &dccp_sk(sk)->dccps_featneg;
+        dccp_feat_val fval = { .nn = nn_val };
+        struct dccp_feat_entry *entry;
+
+        if (sk->sk_state != DCCP_OPEN && sk->sk_state != DCCP_PARTOPEN)
+                return 0;
+
+        if (dccp_feat_type(feat) != FEAT_NN ||
+            !dccp_feat_is_valid_nn_val(feat, nn_val))
+                return -EINVAL;
+
+        entry = dccp_feat_list_lookup(fn, feat, 1);
+        if (entry != NULL) {
+                dccp_pr_debug("Ignoring %llu, entry %llu exists in state %s\n",
+                              (unsigned long long)nn_val,
+                              (unsigned long long)entry->val.nn,
+                              dccp_feat_sname[entry->state]);
+                return 0;
         }
 
-        /* check if there were problems changing features */
-        if (rc) {
-                /* If we don't agree on SP, we sent a confirm for old value.
-                 * However we propagate rc to caller in case option was
-                 * mandatory
+        if (dccp_feat_activate(sk, feat, 1, &fval))
+                return -EADV;
+
+        inet_csk_schedule_ack(sk);
+        return dccp_feat_push_change(fn, feat, 1, 0, &fval);
+}
+EXPORT_SYMBOL_GPL(dccp_feat_signal_nn_change);
+
+/*
+ *      Tracking features whose value depend on the choice of CCID
+ *
+ * This is designed with an extension in mind so that a list walk could be done
+ * before activating any features. However, the existing framework was found to
+ * work satisfactorily up until now, the automatic verification is left open.
+ * When adding new CCIDs, add a corresponding dependency table here.
+ */
+static const struct ccid_dependency *dccp_feat_ccid_deps(u8 ccid, bool is_local)
+{
+        static const struct ccid_dependency ccid2_dependencies[2][2] = {
+                /*
+                 * CCID2 mandates Ack Vectors (RFC 4341, 4.): as CCID is a TX
+                 * feature and Send Ack Vector is an RX feature, `is_local'
+                 * needs to be reversed.
                  */
-                if (rc != DCCP_FEAT_SP_NOAGREE)
-                        dccp_feat_empty_confirm(dccp_msk(sk), type, feature);
+                {       /* Dependencies of the receiver-side (remote) CCID2 */
+                        {
+                                .dependent_feat = DCCPF_SEND_ACK_VECTOR,
+                                .is_local       = true,
+                                .is_mandatory   = true,
+                                .val            = 1
+                        },
+                        { 0, 0, 0, 0 }
+                },
+                {       /* Dependencies of the sender-side (local) CCID2 */
+                        {
+                                .dependent_feat = DCCPF_SEND_ACK_VECTOR,
+                                .is_local       = false,
+                                .is_mandatory   = true,
+                                .val            = 1
+                        },
+                        { 0, 0, 0, 0 }
+                }
+        };
+        static const struct ccid_dependency ccid3_dependencies[2][5] = {
+                {       /*
+                         * Dependencies of the receiver-side CCID3
+                         */
+                        {       /* locally disable Ack Vectors */
+                                .dependent_feat = DCCPF_SEND_ACK_VECTOR,
+                                .is_local       = true,
+                                .is_mandatory   = false,
+                                .val            = 0
+                        },
+                        {       /* see below why Send Loss Event Rate is on */
+                                .dependent_feat = DCCPF_SEND_LEV_RATE,
+                                .is_local       = true,
+                                .is_mandatory   = true,
+                                .val            = 1
+                        },
+                        {       /* NDP Count is needed as per RFC 4342, 6.1.1 */
+                                .dependent_feat = DCCPF_SEND_NDP_COUNT,
+                                .is_local       = false,
+                                .is_mandatory   = true,
+                                .val            = 1
+                        },
+                        { 0, 0, 0, 0 },
+                },
+                {       /*
+                         * CCID3 at the TX side: we request that the HC-receiver
+                         * will not send Ack Vectors (they will be ignored, so
+                         * Mandatory is not set); we enable Send Loss Event Rate
+                         * (Mandatory since the implementation does not support
+                         * the Loss Intervals option of RFC 4342, 8.6).
+                         * The last two options are for peer's information only.
+                        */
+                        {
+                                .dependent_feat = DCCPF_SEND_ACK_VECTOR,
+                                .is_local       = false,
+                                .is_mandatory   = false,
+                                .val            = 0
+                        },
+                        {
+                                .dependent_feat = DCCPF_SEND_LEV_RATE,
+                                .is_local       = false,
+                                .is_mandatory   = true,
+                                .val            = 1
+                        },
+                        {       /* this CCID does not support Ack Ratio */
+                                .dependent_feat = DCCPF_ACK_RATIO,
+                                .is_local       = true,
+                                .is_mandatory   = false,
+                                .val            = 0
+                        },
+                        {       /* tell receiver we are sending NDP counts */
+                                .dependent_feat = DCCPF_SEND_NDP_COUNT,
+                                .is_local       = true,
+                                .is_mandatory   = false,
+                                .val            = 1
+                        },
+                        { 0, 0, 0, 0 }
+                }
+        };
+        switch (ccid) {
+        case DCCPC_CCID2:
+                return ccid2_dependencies[is_local];
+        case DCCPC_CCID3:
+                return ccid3_dependencies[is_local];
+        default:
+                return NULL;
         }
+}
 
-        /* generate the confirm [if required] */
-        dccp_feat_flush_confirm(sk);
-
+/**
+ * dccp_feat_propagate_ccid - Resolve dependencies of features on choice of CCID
+ * @fn: feature-negotiation list to update
+ * @id: CCID number to track
+ * @is_local: whether TX CCID (1) or RX CCID (0) is meant
+ * This function needs to be called after registering all other features.
+ */
+static int dccp_feat_propagate_ccid(struct list_head *fn, u8 id, bool is_local)
+{
+        const struct ccid_dependency *table = dccp_feat_ccid_deps(id, is_local);
+        int i, rc = (table == NULL);
+
+        for (i = 0; rc == 0 && table[i].dependent_feat != DCCPF_RESERVED; i++)
+                if (dccp_feat_type(table[i].dependent_feat) == FEAT_SP)
+                        rc = __feat_register_sp(fn, table[i].dependent_feat,
+                                                    table[i].is_local,
+                                                    table[i].is_mandatory,
+                                                    &table[i].val, 1);
+                else
+                        rc = __feat_register_nn(fn, table[i].dependent_feat,
+                                                    table[i].is_mandatory,
+                                                    table[i].val);
         return rc;
 }
 
-EXPORT_SYMBOL_GPL(dccp_feat_change_recv);
+/**
+ * dccp_feat_finalise_settings  -  Finalise settings before starting negotiation
+ * @dp: client or listening socket (settings will be inherited)
+ * This is called after all registrations (socket initialisation, sysctls, and
+ * sockopt calls), and before sending the first packet containing Change options
+ * (ie. client-Request or server-Response), to ensure internal consistency.
+ */
+int dccp_feat_finalise_settings(struct dccp_sock *dp)
+{
+        struct list_head *fn = &dp->dccps_featneg;
+        struct dccp_feat_entry *entry;
+        int i = 2, ccids[2] = { -1, -1 };
+
+        /*
+         * Propagating CCIDs:
+         * 1) not useful to propagate CCID settings if this host advertises more
+         *    than one CCID: the choice of CCID  may still change - if this is
+         *    the client, or if this is the server and the client sends
+         *    singleton CCID values.
+         * 2) since is that propagate_ccid changes the list, we defer changing
+         *    the sorted list until after the traversal.
+         */
+        list_for_each_entry(entry, fn, node)
+                if (entry->feat_num == DCCPF_CCID && entry->val.sp.len == 1)
+                        ccids[entry->is_local] = entry->val.sp.vec[0];
+        while (i--)
+                if (ccids[i] > 0 && dccp_feat_propagate_ccid(fn, ccids[i], i))
+                        return -1;
+        dccp_feat_print_fnlist(fn);
+        return 0;
+}
 
-int dccp_feat_confirm_recv(struct sock *sk, u8 type, u8 feature,
-                           u8 *val, u8 len)
+/**
+ * dccp_feat_server_ccid_dependencies  -  Resolve CCID-dependent features
+ * It is the server which resolves the dependencies once the CCID has been
+ * fully negotiated. If no CCID has been negotiated, it uses the default CCID.
+ */
+int dccp_feat_server_ccid_dependencies(struct dccp_request_sock *dreq)
 {
-        u8 t;
-        struct dccp_opt_pend *opt;
-        struct dccp_minisock *dmsk = dccp_msk(sk);
-        int found = 0;
-        int all_confirmed = 1;
+        struct list_head *fn = &dreq->dreq_featneg;
+        struct dccp_feat_entry *entry;
+        u8 is_local, ccid;
 
-        dccp_feat_debug(type, feature, *val);
+        for (is_local = 0; is_local <= 1; is_local++) {
+                entry = dccp_feat_list_lookup(fn, DCCPF_CCID, is_local);
 
-        /* locate our change request */
-        switch (type) {
-        case DCCPO_CONFIRM_L: t = DCCPO_CHANGE_R; break;
-        case DCCPO_CONFIRM_R: t = DCCPO_CHANGE_L; break;
-        default:              DCCP_WARN("invalid type %d\n", type);
-                              return 1;
+                if (entry != NULL && !entry->empty_confirm)
+                        ccid = entry->val.sp.vec[0];
+                else
+                        ccid = dccp_feat_default_value(DCCPF_CCID);
 
+                if (dccp_feat_propagate_ccid(fn, ccid, is_local))
+                        return -1;
         }
-        /* XXX sanity check feature value */
+        return 0;
+}
 
-        list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
-                if (!opt->dccpop_conf && opt->dccpop_type == t &&
-                    opt->dccpop_feat == feature) {
-                        found = 1;
-                        dccp_pr_debug("feature %d found\n", opt->dccpop_feat);
+/* Select the first entry in @servlist that also occurs in @clilist (6.3.1) */
+static int dccp_feat_preflist_match(u8 *servlist, u8 slen, u8 *clilist, u8 clen)
+{
+        u8 c, s;
 
-                        /* XXX do sanity check */
+        for (s = 0; s < slen; s++)
+                for (c = 0; c < clen; c++)
+                        if (servlist[s] == clilist[c])
+                                return servlist[s];
+        return -1;
+}
 
-                        opt->dccpop_conf = 1;
+/**
+ * dccp_feat_prefer  -  Move preferred entry to the start of array
+ * Reorder the @array_len elements in @array so that @preferred_value comes
+ * first. Returns >0 to indicate that @preferred_value does occur in @array.
+ */
+static u8 dccp_feat_prefer(u8 preferred_value, u8 *array, u8 array_len)
+{
+        u8 i, does_occur = 0;
 
-                        /* We got a confirmation---change the option */
-                        dccp_feat_update(sk, opt->dccpop_type,
-                                         opt->dccpop_feat, *val);
+        if (array != NULL) {
+                for (i = 0; i < array_len; i++)
+                        if (array[i] == preferred_value) {
+                                array[i] = array[0];
+                                does_occur++;
+                        }
+                if (does_occur)
+                        array[0] = preferred_value;
+        }
+        return does_occur;
+}
 
-                        /* XXX check the return value of dccp_feat_update */
-                        break;
-                }
+/**
+ * dccp_feat_reconcile  -  Reconcile SP preference lists
+ *  @fval: SP list to reconcile into
+ *  @arr: received SP preference list
+ *  @len: length of @arr in bytes
+ *  @is_server: whether this side is the server (and @fv is the server's list)
+ *  @reorder: whether to reorder the list in @fv after reconciling with @arr
+ * When successful, > 0 is returned and the reconciled list is in @fval.
+ * A value of 0 means that negotiation failed (no shared entry).
+ */
+static int dccp_feat_reconcile(dccp_feat_val *fv, u8 *arr, u8 len,
+                               bool is_server, bool reorder)
+{
+        int rc;
 
-                if (!opt->dccpop_conf)
-                        all_confirmed = 0;
+        if (!fv->sp.vec || !arr) {
+                DCCP_CRIT("NULL feature value or array");
+                return 0;
         }
 
-        /* fix re-transmit timer */
-        /* XXX gotta make sure that no option negotiation occurs during
-         * connection shutdown.  Consider that the CLOSEREQ is sent and timer is
-         * on.  if all options are confirmed it might kill timer which should
-         * remain alive until close is received.
-         */
-        if (all_confirmed) {
-                dccp_pr_debug("clear feat negotiation timer %p\n", sk);
-                inet_csk_clear_xmit_timer(sk, ICSK_TIME_RETRANS);
-        }
+        if (is_server)
+                rc = dccp_feat_preflist_match(fv->sp.vec, fv->sp.len, arr, len);
+        else
+                rc = dccp_feat_preflist_match(arr, len, fv->sp.vec, fv->sp.len);
 
-        if (!found)
-                dccp_pr_debug("%s(%d, ...) never requested\n",
-                              dccp_feat_typename(type), feature);
-        return 0;
-}
+        if (!reorder)
+                return rc;
+        if (rc < 0)
+                return 0;
 
-EXPORT_SYMBOL_GPL(dccp_feat_confirm_recv);
+        /*
+         * Reorder list: used for activating features and in dccp_insert_fn_opt.
+         */
+        return dccp_feat_prefer(rc, fv->sp.vec, fv->sp.len);
+}
 
-void dccp_feat_clean(struct dccp_minisock *dmsk)
+/**
+ * dccp_feat_change_recv  -  Process incoming ChangeL/R options
+ * @fn: feature-negotiation list to update
+ * @is_mandatory: whether the Change was preceded by a Mandatory option
+ * @opt: %DCCPO_CHANGE_L or %DCCPO_CHANGE_R
+ * @feat: one of %dccp_feature_numbers
+ * @val: NN value or SP value/preference list
+ * @len: length of @val in bytes
+ * @server: whether this node is the server (1) or the client (0)
+ */
+static u8 dccp_feat_change_recv(struct list_head *fn, u8 is_mandatory, u8 opt,
+                                u8 feat, u8 *val, u8 len, const bool server)
 {
-        struct dccp_opt_pend *opt, *next;
+        u8 defval, type = dccp_feat_type(feat);
+        const bool local = (opt == DCCPO_CHANGE_R);
+        struct dccp_feat_entry *entry;
+        dccp_feat_val fval;
+
+        if (len == 0 || type == FEAT_UNKNOWN)           /* 6.1 and 6.6.8 */
+                goto unknown_feature_or_value;
+
+        dccp_feat_print_opt(opt, feat, val, len, is_mandatory);
+
+        /*
+         *      Negotiation of NN features: Change R is invalid, so there is no
+         *      simultaneous negotiation; hence we do not look up in the list.
+         */
+        if (type == FEAT_NN) {
+                if (local || len > sizeof(fval.nn))
+                        goto unknown_feature_or_value;
 
-        list_for_each_entry_safe(opt, next, &dmsk->dccpms_pending,
-                                 dccpop_node) {
-                BUG_ON(opt->dccpop_val == NULL);
-                kfree(opt->dccpop_val);
+                /* 6.3.2: "The feature remote MUST accept any valid value..." */
+                fval.nn = dccp_decode_value_var(val, len);
+                if (!dccp_feat_is_valid_nn_val(feat, fval.nn))
+                        goto unknown_feature_or_value;
 
-                if (opt->dccpop_sc != NULL) {
-                        BUG_ON(opt->dccpop_sc->dccpoc_val == NULL);
-                        kfree(opt->dccpop_sc->dccpoc_val);
-                        kfree(opt->dccpop_sc);
+                return dccp_feat_push_confirm(fn, feat, local, &fval);
+        }
+
+        /*
+         *      Unidirectional/simultaneous negotiation of SP features (6.3.1)
+         */
+        entry = dccp_feat_list_lookup(fn, feat, local);
+        if (entry == NULL) {
+                /*
+                 * No particular preferences have been registered. We deal with
+                 * this situation by assuming that all valid values are equally
+                 * acceptable, and apply the following checks:
+                 * - if the peer's list is a singleton, we accept a valid value;
+                 * - if we are the server, we first try to see if the peer (the
+                 *   client) advertises the default value. If yes, we use it,
+                 *   otherwise we accept the preferred value;
+                 * - else if we are the client, we use the first list element.
+                 */
+                if (dccp_feat_clone_sp_val(&fval, val, 1))
+                        return DCCP_RESET_CODE_TOO_BUSY;
+
+                if (len > 1 && server) {
+                        defval = dccp_feat_default_value(feat);
+                        if (dccp_feat_preflist_match(&defval, 1, val, len) > -1)
+                                fval.sp.vec[0] = defval;
+                } else if (!dccp_feat_is_valid_sp_val(feat, fval.sp.vec[0])) {
+                        kfree(fval.sp.vec);
+                        goto unknown_feature_or_value;
+                }
+
+                /* Treat unsupported CCIDs like invalid values */
+                if (feat == DCCPF_CCID && !ccid_support_check(fval.sp.vec, 1)) {
+                        kfree(fval.sp.vec);
+                        goto not_valid_or_not_known;
                 }
 
-                kfree(opt);
+                return dccp_feat_push_confirm(fn, feat, local, &fval);
+
+        } else if (entry->state == FEAT_UNSTABLE) {     /* 6.6.2 */
+                return 0;
         }
-        INIT_LIST_HEAD(&dmsk->dccpms_pending);
 
-        list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) {
-                BUG_ON(opt == NULL);
-                if (opt->dccpop_val != NULL)
-                        kfree(opt->dccpop_val);
-                kfree(opt);
+        if (dccp_feat_reconcile(&entry->val, val, len, server, true)) {
+                entry->empty_confirm = 0;
+        } else if (is_mandatory) {
+                return DCCP_RESET_CODE_MANDATORY_ERROR;
+        } else if (entry->state == FEAT_INITIALISING) {
+                /*
+                 * Failed simultaneous negotiation (server only): try to `save'
+                 * the connection by checking whether entry contains the default
+                 * value for @feat. If yes, send an empty Confirm to signal that
+                 * the received Change was not understood - which implies using
+                 * the default value.
+                 * If this also fails, we use Reset as the last resort.
+                 */
+                WARN_ON(!server);
+                defval = dccp_feat_default_value(feat);
+                if (!dccp_feat_reconcile(&entry->val, &defval, 1, server, true))
+                        return DCCP_RESET_CODE_OPTION_ERROR;
+                entry->empty_confirm = 1;
         }
-        INIT_LIST_HEAD(&dmsk->dccpms_conf);
-}
+        entry->needs_confirm   = 1;
+        entry->needs_mandatory = 0;
+        entry->state           = FEAT_STABLE;
+        return 0;
 
-EXPORT_SYMBOL_GPL(dccp_feat_clean);
+unknown_feature_or_value:
+        if (!is_mandatory)
+                return dccp_push_empty_confirm(fn, feat, local);
 
-/* this is to be called only when a listening sock creates its child.  It is
- * assumed by the function---the confirm is not duplicated, but rather it is
- * "passed on".
+not_valid_or_not_known:
+        return is_mandatory ? DCCP_RESET_CODE_MANDATORY_ERROR
+                            : DCCP_RESET_CODE_OPTION_ERROR;
+}
+
+/**
+ * dccp_feat_confirm_recv  -  Process received Confirm options
+ * @fn: feature-negotiation list to update
+ * @is_mandatory: whether @opt was preceded by a Mandatory option
+ * @opt: %DCCPO_CONFIRM_L or %DCCPO_CONFIRM_R
+ * @feat: one of %dccp_feature_numbers
+ * @val: NN value or SP value/preference list
+ * @len: length of @val in bytes
+ * @server: whether this node is server (1) or client (0)
  */
-int dccp_feat_clone(struct sock *oldsk, struct sock *newsk)
+static u8 dccp_feat_confirm_recv(struct list_head *fn, u8 is_mandatory, u8 opt,
+                                 u8 feat, u8 *val, u8 len, const bool server)
 {
-        struct dccp_minisock *olddmsk = dccp_msk(oldsk);
-        struct dccp_minisock *newdmsk = dccp_msk(newsk);
-        struct dccp_opt_pend *opt;
-        int rc = 0;
+        u8 *plist, plen, type = dccp_feat_type(feat);
+        const bool local = (opt == DCCPO_CONFIRM_R);
+        struct dccp_feat_entry *entry = dccp_feat_list_lookup(fn, feat, local);
 
-        INIT_LIST_HEAD(&newdmsk->dccpms_pending);
-        INIT_LIST_HEAD(&newdmsk->dccpms_conf);
+        dccp_feat_print_opt(opt, feat, val, len, is_mandatory);
 
-        list_for_each_entry(opt, &olddmsk->dccpms_pending, dccpop_node) {
-                struct dccp_opt_pend *newopt;
-                /* copy the value of the option */
-                u8 *val = kmemdup(opt->dccpop_val, opt->dccpop_len, GFP_ATOMIC);
+        if (entry == NULL) {    /* nothing queued: ignore or handle error */
+                if (is_mandatory && type == FEAT_UNKNOWN)
+                        return DCCP_RESET_CODE_MANDATORY_ERROR;
 
-                if (val == NULL)
-                        goto out_clean;
-
-                newopt = kmemdup(opt, sizeof(*newopt), GFP_ATOMIC);
-                if (newopt == NULL) {
-                        kfree(val);
-                        goto out_clean;
-                }
+                if (!local && type == FEAT_NN)          /* 6.3.2 */
+                        goto confirmation_failed;
+                return 0;
+        }
 
-                /* insert the option */
-                newopt->dccpop_val = val;
-                list_add_tail(&newopt->dccpop_node, &newdmsk->dccpms_pending);
+        if (entry->state != FEAT_CHANGING)              /* 6.6.2 */
+                return 0;
 
-                /* XXX what happens with backlogs and multiple connections at
-                 * once...
+        if (len == 0) {
+                if (dccp_feat_must_be_understood(feat)) /* 6.6.7 */
+                        goto confirmation_failed;
+                /*
+                 * Empty Confirm during connection setup: this means reverting
+                 * to the `old' value, which in this case is the default. Since
+                 * we handle default values automatically when no other values
+                 * have been set, we revert to the old value by removing this
+                 * entry from the list.
                  */
-                /* the master socket no longer needs to worry about confirms */
-                opt->dccpop_sc = NULL; /* it's not a memleak---new socket has it */
+                dccp_feat_list_pop(entry);
+                return 0;
+        }
+
+        if (type == FEAT_NN) {
+                if (len > sizeof(entry->val.nn))
+                        goto confirmation_failed;
+
+                if (entry->val.nn == dccp_decode_value_var(val, len))
+                        goto confirmation_succeeded;
+
+                DCCP_WARN("Bogus Confirm for non-existing value\n");
+                goto confirmation_failed;
+        }
 
-                /* reset state for a new socket */
-                opt->dccpop_conf = 0;
+        /*
+         * Parsing SP Confirms: the first element of @val is the preferred
+         * SP value which the peer confirms, the remainder depends on @len.
+         * Note that only the confirmed value need to be a valid SP value.
+         */
+        if (!dccp_feat_is_valid_sp_val(feat, *val))
+                goto confirmation_failed;
+
+        if (len == 1) {         /* peer didn't supply a preference list */
+                plist = val;
+                plen  = len;
+        } else {                /* preferred value + preference list */
+                plist = val + 1;
+                plen  = len - 1;
         }
 
-        /* XXX not doing anything about the conf queue */
+        /* Check whether the peer got the reconciliation right (6.6.8) */
+        if (dccp_feat_reconcile(&entry->val, plist, plen, server, 0) != *val) {
+                DCCP_WARN("Confirm selected the wrong value %u\n", *val);
+                return DCCP_RESET_CODE_OPTION_ERROR;
+        }
+        entry->val.sp.vec[0] = *val;
 
-out:
-        return rc;
+confirmation_succeeded:
+        entry->state = FEAT_STABLE;
+        return 0;
 
-out_clean:
-        dccp_feat_clean(newdmsk);
-        rc = -ENOMEM;
-        goto out;
+confirmation_failed:
+        DCCP_WARN("Confirmation failed\n");
+        return is_mandatory ? DCCP_RESET_CODE_MANDATORY_ERROR
+                            : DCCP_RESET_CODE_OPTION_ERROR;
 }
 
-EXPORT_SYMBOL_GPL(dccp_feat_clone);
+/**
+ * dccp_feat_handle_nn_established  -  Fast-path reception of NN options
+ * @sk:         socket of an established DCCP connection
+ * @mandatory:  whether @opt was preceded by a Mandatory option
+ * @opt:        %DCCPO_CHANGE_L | %DCCPO_CONFIRM_R (NN only)
+ * @feat:       NN number, one of %dccp_feature_numbers
+ * @val:        NN value
+ * @len:        length of @val in bytes
+ * This function combines the functionality of change_recv/confirm_recv, with
+ * the following differences (reset codes are the same):
+ *    - cleanup after receiving the Confirm;
+ *    - values are directly activated after successful parsing;
+ *    - deliberately restricted to NN features.
+ * The restriction to NN features is essential since SP features can have non-
+ * predictable outcomes (depending on the remote configuration), and are inter-
+ * dependent (CCIDs for instance cause further dependencies).
+ */
+static u8 dccp_feat_handle_nn_established(struct sock *sk, u8 mandatory, u8 opt,
+                                          u8 feat, u8 *val, u8 len)
+{
+        struct list_head *fn = &dccp_sk(sk)->dccps_featneg;
+        const bool local = (opt == DCCPO_CONFIRM_R);
+        struct dccp_feat_entry *entry;
+        u8 type = dccp_feat_type(feat);
+        dccp_feat_val fval;
+
+        dccp_feat_print_opt(opt, feat, val, len, mandatory);
+
+        /* Ignore non-mandatory unknown and non-NN features */
+        if (type == FEAT_UNKNOWN) {
+                if (local && !mandatory)
+                        return 0;
+                goto fast_path_unknown;
+        } else if (type != FEAT_NN) {
+                return 0;
+        }
+
+        /*
+         * We don't accept empty Confirms, since in fast-path feature
+         * negotiation the values are enabled immediately after sending
+         * the Change option.
+         * Empty Changes on the other hand are invalid (RFC 4340, 6.1).
+         */
+        if (len == 0 || len > sizeof(fval.nn))
+                goto fast_path_unknown;
+
+        if (opt == DCCPO_CHANGE_L) {
+                fval.nn = dccp_decode_value_var(val, len);
+                if (!dccp_feat_is_valid_nn_val(feat, fval.nn))
+                        goto fast_path_unknown;
+
+                if (dccp_feat_push_confirm(fn, feat, local, &fval) ||
+                    dccp_feat_activate(sk, feat, local, &fval))
+                        return DCCP_RESET_CODE_TOO_BUSY;
+
+                /* set the `Ack Pending' flag to piggyback a Confirm */
+                inet_csk_schedule_ack(sk);
+
+        } else if (opt == DCCPO_CONFIRM_R) {
+                entry = dccp_feat_list_lookup(fn, feat, local);
+                if (entry == NULL || entry->state != FEAT_CHANGING)
+                        return 0;
+
+                fval.nn = dccp_decode_value_var(val, len);
+                if (fval.nn != entry->val.nn) {
+                        DCCP_WARN("Bogus Confirm for non-existing value\n");
+                        goto fast_path_failed;
+                }
+
+                /* It has been confirmed - so remove the entry */
+                dccp_feat_list_pop(entry);
+
+        } else {
+                DCCP_WARN("Received illegal option %u\n", opt);
+                goto fast_path_failed;
+        }
+        return 0;
+
+fast_path_unknown:
+        if (!mandatory)
+                return dccp_push_empty_confirm(fn, feat, local);
+
+fast_path_failed:
+        return mandatory ? DCCP_RESET_CODE_MANDATORY_ERROR
+                         : DCCP_RESET_CODE_OPTION_ERROR;
+}
 
-static int __dccp_feat_init(struct dccp_minisock *dmsk, u8 type, u8 feat,
-                            u8 *val, u8 len)
+/**
+ * dccp_feat_parse_options  -  Process Feature-Negotiation Options
+ * @sk: for general use and used by the client during connection setup
+ * @dreq: used by the server during connection setup
+ * @mandatory: whether @opt was preceded by a Mandatory option
+ * @opt: %DCCPO_CHANGE_L | %DCCPO_CHANGE_R | %DCCPO_CONFIRM_L | %DCCPO_CONFIRM_R
+ * @feat: one of %dccp_feature_numbers
+ * @val: value contents of @opt
+ * @len: length of @val in bytes
+ * Returns 0 on success, a Reset code for ending the connection otherwise.
+ */
+int dccp_feat_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
+                            u8 mandatory, u8 opt, u8 feat, u8 *val, u8 len)
 {
-        int rc = -ENOMEM;
-        u8 *copy = kmemdup(val, len, GFP_KERNEL);
+        struct dccp_sock *dp = dccp_sk(sk);
+        struct list_head *fn = dreq ? &dreq->dreq_featneg : &dp->dccps_featneg;
+        bool server = false;
 
-        if (copy != NULL) {
-                rc = dccp_feat_change(dmsk, type, feat, copy, len, GFP_KERNEL);
-                if (rc)
-                        kfree(copy);
+        switch (sk->sk_state) {
+        /*
+         *      Negotiation during connection setup
+         */
+        case DCCP_LISTEN:
+                server = true;                  /* fall through */
+        case DCCP_REQUESTING:
+                switch (opt) {
+                case DCCPO_CHANGE_L:
+                case DCCPO_CHANGE_R:
+                        return dccp_feat_change_recv(fn, mandatory, opt, feat,
+                                                     val, len, server);
+                case DCCPO_CONFIRM_R:
+                case DCCPO_CONFIRM_L:
+                        return dccp_feat_confirm_recv(fn, mandatory, opt, feat,
+                                                      val, len, server);
+                }
+                break;
+        /*
+         *      Support for exchanging NN options on an established connection
+         *      This is currently restricted to Ack Ratio (RFC 4341, 6.1.2)
+         */
+        case DCCP_OPEN:
+        case DCCP_PARTOPEN:
+                return dccp_feat_handle_nn_established(sk, mandatory, opt, feat,
+                                                       val, len);
         }
-        return rc;
+        return 0;       /* ignore FN options in all other states */
 }
 
-int dccp_feat_init(struct dccp_minisock *dmsk)
+/**
+ * dccp_feat_init  -  Seed feature negotiation with host-specific defaults
+ * This initialises global defaults, depending on the value of the sysctls.
+ * These can later be overridden by registering changes via setsockopt calls.
+ * The last link in the chain is finalise_settings, to make sure that between
+ * here and the start of actual feature negotiation no inconsistencies enter.
+ *
+ * All features not appearing below use either defaults or are otherwise
+ * later adjusted through dccp_feat_finalise_settings().
+ */
+int dccp_feat_init(struct sock *sk)
 {
+        struct list_head *fn = &dccp_sk(sk)->dccps_featneg;
+        u8 on = 1, off = 0;
         int rc;
+        struct {
+                u8 *val;
+                u8 len;
+        } tx, rx;
+
+        /* Non-negotiable (NN) features */
+        rc = __feat_register_nn(fn, DCCPF_SEQUENCE_WINDOW, 0,
+                                    sysctl_dccp_sequence_window);
+        if (rc)
+                return rc;
 
-        INIT_LIST_HEAD(&dmsk->dccpms_pending);
-        INIT_LIST_HEAD(&dmsk->dccpms_conf);
+        /* Server-priority (SP) features */
+
+        /* Advertise that short seqnos are not supported (7.6.1) */
+        rc = __feat_register_sp(fn, DCCPF_SHORT_SEQNOS, true, true, &off, 1);
+        if (rc)
+                return rc;
 
-        /* CCID L */
-        rc = __dccp_feat_init(dmsk, DCCPO_CHANGE_L, DCCPF_CCID,
-                              &dmsk->dccpms_tx_ccid, 1);
+        /* RFC 4340 12.1: "If a DCCP is not ECN capable, ..." */
+        rc = __feat_register_sp(fn, DCCPF_ECN_INCAPABLE, true, true, &on, 1);
         if (rc)
-                goto out;
+                return rc;
+
+        /*
+         * We advertise the available list of CCIDs and reorder according to
+         * preferences, to avoid failure resulting from negotiating different
+         * singleton values (which always leads to failure).
+         * These settings can still (later) be overridden via sockopts.
+         */
+        if (ccid_get_builtin_ccids(&tx.val, &tx.len) ||
+            ccid_get_builtin_ccids(&rx.val, &rx.len))
+                return -ENOBUFS;
+
+        /* Pre-load all CCID modules that are going to be advertised */
+        rc = -EUNATCH;
+        if (ccid_request_modules(tx.val, tx.len))
+                goto free_ccid_lists;
+
+        if (!dccp_feat_prefer(sysctl_dccp_tx_ccid, tx.val, tx.len) ||
+            !dccp_feat_prefer(sysctl_dccp_rx_ccid, rx.val, rx.len))
+                goto free_ccid_lists;
 
-        /* CCID R */
-        rc = __dccp_feat_init(dmsk, DCCPO_CHANGE_R, DCCPF_CCID,
-                              &dmsk->dccpms_rx_ccid, 1);
+        rc = __feat_register_sp(fn, DCCPF_CCID, true, false, tx.val, tx.len);
         if (rc)
-                goto out;
+                goto free_ccid_lists;
 
-        /* Ack ratio */
-        rc = __dccp_feat_init(dmsk, DCCPO_CHANGE_L, DCCPF_ACK_RATIO,
-                              &dmsk->dccpms_ack_ratio, 1);
-out:
+        rc = __feat_register_sp(fn, DCCPF_CCID, false, false, rx.val, rx.len);
+
+free_ccid_lists:
+        kfree(tx.val);
+        kfree(rx.val);
         return rc;
 }
 
-EXPORT_SYMBOL_GPL(dccp_feat_init);
-
-#ifdef CONFIG_IP_DCCP_DEBUG
-const char *dccp_feat_typename(const u8 type)
+int dccp_feat_activate_values(struct sock *sk, struct list_head *fn_list)
 {
-        switch(type) {
-        case DCCPO_CHANGE_L:  return("ChangeL");
-        case DCCPO_CONFIRM_L: return("ConfirmL");
-        case DCCPO_CHANGE_R:  return("ChangeR");
-        case DCCPO_CONFIRM_R: return("ConfirmR");
-        /* the following case must not appear in feature negotation  */
-        default:              dccp_pr_debug("unknown type %d [BUG!]\n", type);
+        struct dccp_sock *dp = dccp_sk(sk);
+        struct dccp_feat_entry *cur, *next;
+        int idx;
+        dccp_feat_val *fvals[DCCP_FEAT_SUPPORTED_MAX][2] = {
+                 [0 ... DCCP_FEAT_SUPPORTED_MAX-1] = { NULL, NULL }
+        };
+
+        list_for_each_entry(cur, fn_list, node) {
+                /*
+                 * An empty Confirm means that either an unknown feature type
+                 * or an invalid value was present. In the first case there is
+                 * nothing to activate, in the other the default value is used.
+                 */
+                if (cur->empty_confirm)
+                        continue;
+
+                idx = dccp_feat_index(cur->feat_num);
+                if (idx < 0) {
+                        DCCP_BUG("Unknown feature %u", cur->feat_num);
+                        goto activation_failed;
+                }
+                if (cur->state != FEAT_STABLE) {
+                        DCCP_CRIT("Negotiation of %s %s failed in state %s",
+                                  cur->is_local ? "local" : "remote",
+                                  dccp_feat_fname(cur->feat_num),
+                                  dccp_feat_sname[cur->state]);
+                        goto activation_failed;
+                }
+                fvals[idx][cur->is_local] = &cur->val;
         }
-        return NULL;
-}
 
-EXPORT_SYMBOL_GPL(dccp_feat_typename);
+        /*
+         * Activate in decreasing order of index, so that the CCIDs are always
+         * activated as the last feature. This avoids the case where a CCID
+         * relies on the initialisation of one or more features that it depends
+         * on (e.g. Send NDP Count, Send Ack Vector, and Ack Ratio features).
+         */
+        for (idx = DCCP_FEAT_SUPPORTED_MAX; --idx >= 0;)
+                if (__dccp_feat_activate(sk, idx, 0, fvals[idx][0]) ||
+                    __dccp_feat_activate(sk, idx, 1, fvals[idx][1])) {
+                        DCCP_CRIT("Could not activate %d", idx);
+                        goto activation_failed;
+                }
 
-const char *dccp_feat_name(const u8 feat)
-{
-        static const char *feature_names[] = {
-                [DCCPF_RESERVED]        = "Reserved",
-                [DCCPF_CCID]            = "CCID",
-                [DCCPF_SHORT_SEQNOS]    = "Allow Short Seqnos",
-                [DCCPF_SEQUENCE_WINDOW] = "Sequence Window",
-                [DCCPF_ECN_INCAPABLE]   = "ECN Incapable",
-                [DCCPF_ACK_RATIO]       = "Ack Ratio",
-                [DCCPF_SEND_ACK_VECTOR] = "Send ACK Vector",
-                [DCCPF_SEND_NDP_COUNT]  = "Send NDP Count",
-                [DCCPF_MIN_CSUM_COVER]  = "Min. Csum Coverage",
-                [DCCPF_DATA_CHECKSUM]   = "Send Data Checksum",
-        };
-        if (feat > DCCPF_DATA_CHECKSUM && feat < DCCPF_MIN_CCID_SPECIFIC)
-                return feature_names[DCCPF_RESERVED];
+        /* Clean up Change options which have been confirmed already */
+        list_for_each_entry_safe(cur, next, fn_list, node)
+                if (!cur->needs_confirm)
+                        dccp_feat_list_pop(cur);
 
-        if (feat >= DCCPF_MIN_CCID_SPECIFIC)
-                return "CCID-specific";
+        dccp_pr_debug("Activation OK\n");
+        return 0;
 
-        return feature_names[feat];
+activation_failed:
+        /*
+         * We clean up everything that may have been allocated, since
+         * it is difficult to track at which stage negotiation failed.
+         * This is ok, since all allocation functions below are robust
+         * against NULL arguments.
+         */
+        ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk);
+        ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk);
+        dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL;
+        dccp_ackvec_free(dp->dccps_hc_rx_ackvec);
+        dp->dccps_hc_rx_ackvec = NULL;
+        return -1;
 }
-
-EXPORT_SYMBOL_GPL(dccp_feat_name);
-#endif /* CONFIG_IP_DCCP_DEBUG */
diff --git a/net/dccp/feat.h b/net/dccp/feat.h
index e272222c7ace..2217066e22d7 100644
--- a/net/dccp/feat.h
+++ b/net/dccp/feat.h
@@ -3,38 +3,134 @@
 /*
  *  net/dccp/feat.h
  *
- *  An implementation of the DCCP protocol
+ *  Feature negotiation for the DCCP protocol (RFC 4340, section 6)
+ *  Copyright (c) 2008 Gerrit Renker <gerrit@erg.abdn.ac.uk>
  *  Copyright (c) 2005 Andrea Bittau <a.bittau@cs.ucl.ac.uk>
  *
- *      This program is free software; you can redistribute it and/or modify it
- *      under the terms of the GNU General Public License version 2 as
- *      published by the Free Software Foundation.
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
  */
-
 #include <linux/types.h>
 #include "dccp.h"
 
-#ifdef CONFIG_IP_DCCP_DEBUG
-extern const char *dccp_feat_typename(const u8 type);
-extern const char *dccp_feat_name(const u8 feat);
+/*
+ * Known limit values
+ */
+/* Ack Ratio takes 2-byte integer values (11.3) */
+#define DCCPF_ACK_RATIO_MAX     0xFFFF
+/* Wmin=32 and Wmax=2^46-1 from 7.5.2 */
+#define DCCPF_SEQ_WMIN          32
+#define DCCPF_SEQ_WMAX          0x3FFFFFFFFFFFull
+/* Maximum number of SP values that fit in a single (Confirm) option */
+#define DCCP_FEAT_MAX_SP_VALS   (DCCP_SINGLE_OPT_MAXLEN - 2)
+
+enum dccp_feat_type {
+        FEAT_AT_RX   = 1,       /* located at RX side of half-connection  */
+        FEAT_AT_TX   = 2,       /* located at TX side of half-connection  */
+        FEAT_SP      = 4,       /* server-priority reconciliation (6.3.1) */
+        FEAT_NN      = 8,       /* non-negotiable reconciliation (6.3.2)  */
+        FEAT_UNKNOWN = 0xFF     /* not understood or invalid feature      */
+};
+
+enum dccp_feat_state {
+        FEAT_DEFAULT = 0,       /* using default values from 6.4 */
+        FEAT_INITIALISING,      /* feature is being initialised  */
+        FEAT_CHANGING,          /* Change sent but not confirmed yet */
+        FEAT_UNSTABLE,          /* local modification in state CHANGING */
+        FEAT_STABLE             /* both ends (think they) agree */
+};
 
-static inline void dccp_feat_debug(const u8 type, const u8 feat, const u8 val)
+/**
+ * dccp_feat_val  -  Container for SP or NN feature values
+ * @nn:     single NN value
+ * @sp.vec: single SP value plus optional preference list
+ * @sp.len: length of @sp.vec in bytes
+ */
+typedef union {
+        u64 nn;
+        struct {
+                u8      *vec;
+                u8      len;
+        }   sp;
+} dccp_feat_val;
+
+/**
+ * struct feat_entry  -  Data structure to perform feature negotiation
+ * @feat_num: one of %dccp_feature_numbers
+ * @val: feature's current value (SP features may have preference list)
+ * @state: feature's current state
+ * @needs_mandatory: whether Mandatory options should be sent
+ * @needs_confirm: whether to send a Confirm instead of a Change
+ * @empty_confirm: whether to send an empty Confirm (depends on @needs_confirm)
+ * @is_local: feature location (1) or feature-remote (0)
+ * @node: list pointers, entries arranged in FIFO order
+ */
+struct dccp_feat_entry {
+        u8                      feat_num;
+        dccp_feat_val           val;
+        enum dccp_feat_state    state:8;
+        bool                    needs_mandatory:1,
+                                needs_confirm:1,
+                                empty_confirm:1,
+                                is_local:1;
+
+        struct list_head        node;
+};
+
+static inline u8 dccp_feat_genopt(struct dccp_feat_entry *entry)
 {
-        dccp_pr_debug("%s(%s (%d), %d)\n", dccp_feat_typename(type),
-                                           dccp_feat_name(feat), feat, val);
+        if (entry->needs_confirm)
+                return entry->is_local ? DCCPO_CONFIRM_L : DCCPO_CONFIRM_R;
+        return entry->is_local ? DCCPO_CHANGE_L : DCCPO_CHANGE_R;
 }
-#else
-#define dccp_feat_debug(type, feat, val)
-#endif /* CONFIG_IP_DCCP_DEBUG */
-
-extern int  dccp_feat_change(struct dccp_minisock *dmsk, u8 type, u8 feature,
-                             u8 *val, u8 len, gfp_t gfp);
-extern int  dccp_feat_change_recv(struct sock *sk, u8 type, u8 feature,
-                                  u8 *val, u8 len);
-extern int  dccp_feat_confirm_recv(struct sock *sk, u8 type, u8 feature,
-                                   u8 *val, u8 len);
-extern void dccp_feat_clean(struct dccp_minisock *dmsk);
-extern int  dccp_feat_clone(struct sock *oldsk, struct sock *newsk);
-extern int  dccp_feat_init(struct dccp_minisock *dmsk);
 
+/**
+ * struct ccid_dependency  -  Track changes resulting from choosing a CCID
+ * @dependent_feat: one of %dccp_feature_numbers
+ * @is_local: local (1) or remote (0) @dependent_feat
+ * @is_mandatory: whether presence of @dependent_feat is mission-critical or not
+ * @val: corresponding default value for @dependent_feat (u8 is sufficient here)
+ */
+struct ccid_dependency {
+        u8      dependent_feat;
+        bool    is_local:1,
+                is_mandatory:1;
+        u8      val;
+};
+
+/*
+ * Sysctls to seed defaults for feature negotiation
+ */
+extern unsigned long sysctl_dccp_sequence_window;
+extern int           sysctl_dccp_rx_ccid;
+extern int           sysctl_dccp_tx_ccid;
+
+extern int  dccp_feat_init(struct sock *sk);
+extern void dccp_feat_initialise_sysctls(void);
+extern int  dccp_feat_register_sp(struct sock *sk, u8 feat, u8 is_local,
+                                  u8 const *list, u8 len);
+extern int  dccp_feat_register_nn(struct sock *sk, u8 feat, u64 val);
+extern int  dccp_feat_parse_options(struct sock *, struct dccp_request_sock *,
+                                    u8 mand, u8 opt, u8 feat, u8 *val, u8 len);
+extern int  dccp_feat_clone_list(struct list_head const *, struct list_head *);
+
+/*
+ * Encoding variable-length options and their maximum length.
+ *
+ * This affects NN options (SP options are all u8) and other variable-length
+ * options (see table 3 in RFC 4340). The limit is currently given the Sequence
+ * Window NN value (sec. 7.5.2) and the NDP count (sec. 7.7) option, all other
+ * options consume less than 6 bytes (timestamps are 4 bytes).
+ * When updating this constant (e.g. due to new internet drafts / RFCs), make
+ * sure that you also update all code which refers to it.
+ */
+#define DCCP_OPTVAL_MAXLEN      6
+
+extern void dccp_encode_value_var(const u64 value, u8 *to, const u8 len);
+extern u64  dccp_decode_value_var(const u8 *bf, const u8 len);
+
+extern int  dccp_insert_option_mandatory(struct sk_buff *skb);
+extern int  dccp_insert_fn_opt(struct sk_buff *skb, u8 type, u8 feat,
+                               u8 *val, u8 len, bool repeat_first);
 #endif /* _DCCP_FEAT_H */
diff --git a/net/dccp/input.c b/net/dccp/input.c
index 779d0ed9ae94..df0e6714aa11 100644
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -159,13 +159,15 @@ static void dccp_rcv_reset(struct sock *sk, struct sk_buff *skb)
         dccp_time_wait(sk, DCCP_TIME_WAIT, 0);
 }
 
-static void dccp_event_ack_recv(struct sock *sk, struct sk_buff *skb)
+static void dccp_handle_ackvec_processing(struct sock *sk, struct sk_buff *skb)
 {
-        struct dccp_sock *dp = dccp_sk(sk);
+        struct dccp_ackvec *av = dccp_sk(sk)->dccps_hc_rx_ackvec;
 
-        if (dccp_msk(sk)->dccpms_send_ack_vector)
-                dccp_ackvec_check_rcv_ackno(dp->dccps_hc_rx_ackvec, sk,
-                                            DCCP_SKB_CB(skb)->dccpd_ack_seq);
+        if (av == NULL)
+                return;
+        if (DCCP_SKB_CB(skb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
+                dccp_ackvec_clear_state(av, DCCP_SKB_CB(skb)->dccpd_ack_seq);
+        dccp_ackvec_input(av, skb);
 }
 
 static void dccp_deliver_input_to_ccids(struct sock *sk, struct sk_buff *skb)
@@ -364,22 +366,13 @@ discard:
 int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
                          const struct dccp_hdr *dh, const unsigned len)
 {
-        struct dccp_sock *dp = dccp_sk(sk);
-
         if (dccp_check_seqno(sk, skb))
                 goto discard;
 
         if (dccp_parse_options(sk, NULL, skb))
                 return 1;
 
-        if (DCCP_SKB_CB(skb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
-                dccp_event_ack_recv(sk, skb);
-
-        if (dccp_msk(sk)->dccpms_send_ack_vector &&
-            dccp_ackvec_add(dp->dccps_hc_rx_ackvec, sk,
-                            DCCP_SKB_CB(skb)->dccpd_seq,
-                            DCCP_ACKVEC_STATE_RECEIVED))
-                goto discard;
+        dccp_handle_ackvec_processing(sk, skb);
         dccp_deliver_input_to_ccids(sk, skb);
 
         return __dccp_rcv_established(sk, skb, dh, len);
@@ -421,40 +414,33 @@ static int dccp_rcv_request_sent_state_process(struct sock *sk,
                         goto out_invalid_packet;
                 }
 
+                /*
+                 * If option processing (Step 8) failed, return 1 here so that
+                 * dccp_v4_do_rcv() sends a Reset. The Reset code depends on
+                 * the option type and is set in dccp_parse_options().
+                 */
                 if (dccp_parse_options(sk, NULL, skb))
-                        goto out_invalid_packet;
+                        return 1;
 
                 /* Obtain usec RTT sample from SYN exchange (used by CCID 3) */
                 if (likely(dp->dccps_options_received.dccpor_timestamp_echo))
                         dp->dccps_syn_rtt = dccp_sample_rtt(sk, 10 * (tstamp -
                             dp->dccps_options_received.dccpor_timestamp_echo));
 
-                if (dccp_msk(sk)->dccpms_send_ack_vector &&
-                    dccp_ackvec_add(dp->dccps_hc_rx_ackvec, sk,
-                                    DCCP_SKB_CB(skb)->dccpd_seq,
-                                    DCCP_ACKVEC_STATE_RECEIVED))
-                        goto out_invalid_packet; /* FIXME: change error code */
-
                 /* Stop the REQUEST timer */
                 inet_csk_clear_xmit_timer(sk, ICSK_TIME_RETRANS);
                 WARN_ON(sk->sk_send_head == NULL);
                 kfree_skb(sk->sk_send_head);
                 sk->sk_send_head = NULL;
 
-                dp->dccps_isr = DCCP_SKB_CB(skb)->dccpd_seq;
-                dccp_update_gsr(sk, dp->dccps_isr);
                 /*
-                 * SWL and AWL are initially adjusted so that they are not less than
-                 * the initial Sequence Numbers received and sent, respectively:
-                 *      SWL := max(GSR + 1 - floor(W/4), ISR),
-                 *      AWL := max(GSS - W' + 1, ISS).
-                 * These adjustments MUST be applied only at the beginning of the
-                 * connection.
-                 *
-                 * AWL was adjusted in dccp_v4_connect -acme
+                 * Set ISR, GSR from packet. ISS was set in dccp_v{4,6}_connect
+                 * and GSS in dccp_transmit_skb(). Setting AWL/AWH and SWL/SWH
+                 * is done as part of activating the feature values below, since
+                 * these settings depend on the local/remote Sequence Window
+                 * features, which were undefined or not confirmed until now.
                  */
-                dccp_set_seqno(&dp->dccps_swl,
-                               max48(dp->dccps_swl, dp->dccps_isr));
+                dp->dccps_gsr = dp->dccps_isr = DCCP_SKB_CB(skb)->dccpd_seq;
 
                 dccp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 
@@ -475,6 +461,15 @@ static int dccp_rcv_request_sent_state_process(struct sock *sk,
                  */
                 dccp_set_state(sk, DCCP_PARTOPEN);
 
+                /*
+                 * If feature negotiation was successful, activate features now;
+                 * an activation failure means that this host could not activate
+                 * one ore more features (e.g. insufficient memory), which would
+                 * leave at least one feature in an undefined state.
+                 */
+                if (dccp_feat_activate_values(sk, &dp->dccps_featneg))
+                        goto unable_to_proceed;
+
                 /* Make sure socket is routed, for correct metrics. */
                 icsk->icsk_af_ops->rebuild_header(sk);
 
@@ -509,6 +504,16 @@ out_invalid_packet:
         /* dccp_v4_do_rcv will send a reset */
         DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_PACKET_ERROR;
         return 1;
+
+unable_to_proceed:
+        DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_ABORTED;
+        /*
+         * We mark this socket as no longer usable, so that the loop in
+         * dccp_sendmsg() terminates and the application gets notified.
+         */
+        dccp_set_state(sk, DCCP_CLOSED);
+        sk->sk_err = ECOMM;
+        return 1;
 }
 
 static int dccp_rcv_respond_partopen_state_process(struct sock *sk,
@@ -590,8 +595,6 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
                         if (inet_csk(sk)->icsk_af_ops->conn_request(sk,
                                                                     skb) < 0)
                                 return 1;
-
-                        /* FIXME: do congestion control initialization */
                         goto discard;
                 }
                 if (dh->dccph_type == DCCP_PKT_RESET)
@@ -600,30 +603,36 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
                 /* Caller (dccp_v4_do_rcv) will send Reset */
                 dcb->dccpd_reset_code = DCCP_RESET_CODE_NO_CONNECTION;
                 return 1;
+        } else if (sk->sk_state == DCCP_CLOSED) {
+                dcb->dccpd_reset_code = DCCP_RESET_CODE_NO_CONNECTION;
+                return 1;
         }
 
-        if (sk->sk_state != DCCP_REQUESTING) {
-                if (dccp_check_seqno(sk, skb))
-                        goto discard;
-
-                /*
-                 * Step 8: Process options and mark acknowledgeable
-                 */
-                if (dccp_parse_options(sk, NULL, skb))
-                        return 1;
-
-                if (dcb->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
-                        dccp_event_ack_recv(sk, skb);
-
-                if (dccp_msk(sk)->dccpms_send_ack_vector &&
-                    dccp_ackvec_add(dp->dccps_hc_rx_ackvec, sk,
-                                    DCCP_SKB_CB(skb)->dccpd_seq,
-                                    DCCP_ACKVEC_STATE_RECEIVED))
-                        goto discard;
+        /* Step 6: Check sequence numbers (omitted in LISTEN/REQUEST state) */
+        if (sk->sk_state != DCCP_REQUESTING && dccp_check_seqno(sk, skb))
+                goto discard;
 
-                dccp_deliver_input_to_ccids(sk, skb);
+        /*
+         *   Step 7: Check for unexpected packet types
+         *      If (S.is_server and P.type == Response)
+         *          or (S.is_client and P.type == Request)
+         *          or (S.state == RESPOND and P.type == Data),
+         *        Send Sync packet acknowledging P.seqno
+         *        Drop packet and return
+         */
+        if ((dp->dccps_role != DCCP_ROLE_CLIENT &&
+             dh->dccph_type == DCCP_PKT_RESPONSE) ||
+            (dp->dccps_role == DCCP_ROLE_CLIENT &&
+             dh->dccph_type == DCCP_PKT_REQUEST) ||
+            (sk->sk_state == DCCP_RESPOND && dh->dccph_type == DCCP_PKT_DATA)) {
+                dccp_send_sync(sk, dcb->dccpd_seq, DCCP_PKT_SYNC);
+                goto discard;
         }
 
+        /*  Step 8: Process options */
+        if (dccp_parse_options(sk, NULL, skb))
+                return 1;
+
         /*
          *  Step 9: Process Reset
          *      If P.type == Reset,
@@ -631,44 +640,22 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
          *              S.state := TIMEWAIT
          *              Set TIMEWAIT timer
          *              Drop packet and return
-        */
+         */
         if (dh->dccph_type == DCCP_PKT_RESET) {
                 dccp_rcv_reset(sk, skb);
                 return 0;
-                /*
-                 *   Step 7: Check for unexpected packet types
-                 *      If (S.is_server and P.type == Response)
-                 *          or (S.is_client and P.type == Request)
-                 *          or (S.state == RESPOND and P.type == Data),
-                 *        Send Sync packet acknowledging P.seqno
-                 *        Drop packet and return
-                 */
-        } else if ((dp->dccps_role != DCCP_ROLE_CLIENT &&
-                    dh->dccph_type == DCCP_PKT_RESPONSE) ||
-                    (dp->dccps_role == DCCP_ROLE_CLIENT &&
-                     dh->dccph_type == DCCP_PKT_REQUEST) ||
-                    (sk->sk_state == DCCP_RESPOND &&
-                     dh->dccph_type == DCCP_PKT_DATA)) {
-                dccp_send_sync(sk, dcb->dccpd_seq, DCCP_PKT_SYNC);
-                goto discard;
-        } else if (dh->dccph_type == DCCP_PKT_CLOSEREQ) {
+        } else if (dh->dccph_type == DCCP_PKT_CLOSEREQ) {       /* Step 13 */
                 if (dccp_rcv_closereq(sk, skb))
                         return 0;
                 goto discard;
-        } else if (dh->dccph_type == DCCP_PKT_CLOSE) {
+        } else if (dh->dccph_type == DCCP_PKT_CLOSE) {          /* Step 14 */
                 if (dccp_rcv_close(sk, skb))
                         return 0;
                 goto discard;
         }
 
         switch (sk->sk_state) {
-        case DCCP_CLOSED:
-                dcb->dccpd_reset_code = DCCP_RESET_CODE_NO_CONNECTION;
-                return 1;
-
         case DCCP_REQUESTING:
-                /* FIXME: do congestion control initialization */
-
                 queued = dccp_rcv_request_sent_state_process(sk, skb, dh, len);
                 if (queued >= 0)
                         return queued;
@@ -676,8 +663,12 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
                 __kfree_skb(skb);
                 return 0;
 
-        case DCCP_RESPOND:
         case DCCP_PARTOPEN:
+                /* Step 8: if using Ack Vectors, mark packet acknowledgeable */
+                dccp_handle_ackvec_processing(sk, skb);
+                dccp_deliver_input_to_ccids(sk, skb);
+                /* fall through */
+        case DCCP_RESPOND:
                 queued = dccp_rcv_respond_partopen_state_process(sk, skb,
                                                                  dh, len);
                 break;
@@ -716,16 +707,7 @@ u32 dccp_sample_rtt(struct sock *sk, long delta)
         /* dccpor_elapsed_time is either zeroed out or set and > 0 */
         delta -= dccp_sk(sk)->dccps_options_received.dccpor_elapsed_time * 10;
 
-        if (unlikely(delta <= 0)) {
-                DCCP_WARN("unusable RTT sample %ld, using min\n", delta);
-                return DCCP_SANE_RTT_MIN;
-        }
-        if (unlikely(delta > DCCP_SANE_RTT_MAX)) {
-                DCCP_WARN("RTT sample %ld too large, using max\n", delta);
-                return DCCP_SANE_RTT_MAX;
-        }
-
-        return delta;
+        return dccp_sane_rtt(delta);
 }
 
 EXPORT_SYMBOL_GPL(dccp_sample_rtt);
diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index 882c5c4de69e..b623f6b25482 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -545,6 +545,7 @@ out:
 
 static void dccp_v4_reqsk_destructor(struct request_sock *req)
 {
+        dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
         kfree(inet_rsk(req)->opt);
 }
 
@@ -595,7 +596,8 @@ int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
         if (req == NULL)
                 goto drop;
 
-        dccp_reqsk_init(req, skb);
+        if (dccp_reqsk_init(req, dccp_sk(sk), skb))
+                goto drop_and_free;
 
         dreq = dccp_rsk(req);
         if (dccp_parse_options(sk, dreq, skb))
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 5e1ee0da2c40..ad6212e00435 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -302,6 +302,7 @@ done:
 
 static void dccp_v6_reqsk_destructor(struct request_sock *req)
 {
+        dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
         if (inet6_rsk(req)->pktopts != NULL)
                 kfree_skb(inet6_rsk(req)->pktopts);
 }
@@ -424,7 +425,8 @@ static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
         if (req == NULL)
                 goto drop;
 
-        dccp_reqsk_init(req, skb);
+        if (dccp_reqsk_init(req, dccp_sk(sk), skb))
+                goto drop_and_free;
 
         dreq = dccp_rsk(req);
         if (dccp_parse_options(sk, dreq, skb))
diff --git a/net/dccp/minisocks.c b/net/dccp/minisocks.c
index b2804e2d1b8c..f4d9c8f60ede 100644
--- a/net/dccp/minisocks.c
+++ b/net/dccp/minisocks.c
@@ -42,16 +42,6 @@ struct inet_timewait_death_row dccp_death_row = {
 
 EXPORT_SYMBOL_GPL(dccp_death_row);
 
-void dccp_minisock_init(struct dccp_minisock *dmsk)
-{
-        dmsk->dccpms_sequence_window = sysctl_dccp_feat_sequence_window;
-        dmsk->dccpms_rx_ccid         = sysctl_dccp_feat_rx_ccid;
-        dmsk->dccpms_tx_ccid         = sysctl_dccp_feat_tx_ccid;
-        dmsk->dccpms_ack_ratio       = sysctl_dccp_feat_ack_ratio;
-        dmsk->dccpms_send_ack_vector = sysctl_dccp_feat_send_ack_vector;
-        dmsk->dccpms_send_ndp_count  = sysctl_dccp_feat_send_ndp_count;
-}
-
 void dccp_time_wait(struct sock *sk, int state, int timeo)
 {
         struct inet_timewait_sock *tw = NULL;
@@ -112,10 +102,9 @@ struct sock *dccp_create_openreq_child(struct sock *sk,
         struct sock *newsk = inet_csk_clone(sk, req, GFP_ATOMIC);
 
         if (newsk != NULL) {
-                const struct dccp_request_sock *dreq = dccp_rsk(req);
+                struct dccp_request_sock *dreq = dccp_rsk(req);
                 struct inet_connection_sock *newicsk = inet_csk(newsk);
                 struct dccp_sock *newdp = dccp_sk(newsk);
-                struct dccp_minisock *newdmsk = dccp_msk(newsk);
 
                 newdp->dccps_role           = DCCP_ROLE_SERVER;
                 newdp->dccps_hc_rx_ackvec   = NULL;
@@ -125,65 +114,32 @@ struct sock *dccp_create_openreq_child(struct sock *sk,
                 newdp->dccps_timestamp_time = dreq->dreq_timestamp_time;
                 newicsk->icsk_rto           = DCCP_TIMEOUT_INIT;
 
-                if (dccp_feat_clone(sk, newsk))
-                        goto out_free;
-
-                if (newdmsk->dccpms_send_ack_vector) {
-                        newdp->dccps_hc_rx_ackvec =
-                                                dccp_ackvec_alloc(GFP_ATOMIC);
-                        if (unlikely(newdp->dccps_hc_rx_ackvec == NULL))
-                                goto out_free;
-                }
-
-                newdp->dccps_hc_rx_ccid =
-                            ccid_hc_rx_new(newdmsk->dccpms_rx_ccid,
-                                           newsk, GFP_ATOMIC);
-                newdp->dccps_hc_tx_ccid =
-                            ccid_hc_tx_new(newdmsk->dccpms_tx_ccid,
-                                           newsk, GFP_ATOMIC);
-                if (unlikely(newdp->dccps_hc_rx_ccid == NULL ||
-                             newdp->dccps_hc_tx_ccid == NULL)) {
-                        dccp_ackvec_free(newdp->dccps_hc_rx_ackvec);
-                        ccid_hc_rx_delete(newdp->dccps_hc_rx_ccid, newsk);
-                        ccid_hc_tx_delete(newdp->dccps_hc_tx_ccid, newsk);
-out_free:
-                        /* It is still raw copy of parent, so invalidate
-                         * destructor and make plain sk_free() */
-                        newsk->sk_destruct = NULL;
-                        sk_free(newsk);
-                        return NULL;
-                }
-
+                INIT_LIST_HEAD(&newdp->dccps_featneg);
                 /*
                  * Step 3: Process LISTEN state
                  *
                  *    Choose S.ISS (initial seqno) or set from Init Cookies
                  *    Initialize S.GAR := S.ISS
-                 *    Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
+                 *    Set S.ISR, S.GSR from packet (or Init Cookies)
+                 *
+                 *    Setting AWL/AWH and SWL/SWH happens as part of the feature
+                 *    activation below, as these windows all depend on the local
+                 *    and remote Sequence Window feature values (7.5.2).
                  */
-
-                /* See dccp_v4_conn_request */
-                newdmsk->dccpms_sequence_window = req->rcv_wnd;
-
-                newdp->dccps_gar = newdp->dccps_iss = dreq->dreq_iss;
-                dccp_update_gss(newsk, dreq->dreq_iss);
-
-                newdp->dccps_isr = dreq->dreq_isr;
-                dccp_update_gsr(newsk, dreq->dreq_isr);
+                newdp->dccps_gss = newdp->dccps_iss = dreq->dreq_iss;
+                newdp->dccps_gar = newdp->dccps_iss;
+                newdp->dccps_gsr = newdp->dccps_isr = dreq->dreq_isr;
 
                 /*
-                 * SWL and AWL are initially adjusted so that they are not less than
-                 * the initial Sequence Numbers received and sent, respectively:
-                 *      SWL := max(GSR + 1 - floor(W/4), ISR),
-                 *      AWL := max(GSS - W' + 1, ISS).
-                 * These adjustments MUST be applied only at the beginning of the
-                 * connection.
+                 * Activate features: initialise CCIDs, sequence windows etc.
                  */
-                dccp_set_seqno(&newdp->dccps_swl,
-                               max48(newdp->dccps_swl, newdp->dccps_isr));
-                dccp_set_seqno(&newdp->dccps_awl,
-                               max48(newdp->dccps_awl, newdp->dccps_iss));
-
+                if (dccp_feat_activate_values(newsk, &dreq->dreq_featneg)) {
+                        /* It is still raw copy of parent, so invalidate
+                         * destructor and make plain sk_free() */
+                        newsk->sk_destruct = NULL;
+                        sk_free(newsk);
+                        return NULL;
+                }
                 dccp_init_xmit_timers(newsk);
 
                 DCCP_INC_STATS_BH(DCCP_MIB_PASSIVEOPENS);
@@ -304,14 +260,17 @@ void dccp_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
 
 EXPORT_SYMBOL_GPL(dccp_reqsk_send_ack);
 
-void dccp_reqsk_init(struct request_sock *req, struct sk_buff *skb)
+int dccp_reqsk_init(struct request_sock *req,
+                    struct dccp_sock const *dp, struct sk_buff const *skb)
 {
         struct dccp_request_sock *dreq = dccp_rsk(req);
 
         inet_rsk(req)->rmt_port   = dccp_hdr(skb)->dccph_sport;
         inet_rsk(req)->acked      = 0;
-        req->rcv_wnd              = sysctl_dccp_feat_sequence_window;
         dreq->dreq_timestamp_echo = 0;
+
+        /* inherit feature negotiation options from listening socket */
+        return dccp_feat_clone_list(&dp->dccps_featneg, &dreq->dreq_featneg);
 }
 
 EXPORT_SYMBOL_GPL(dccp_reqsk_init);
diff --git a/net/dccp/options.c b/net/dccp/options.c
index 0809b63cb055..e5a32979d7d7 100644
--- a/net/dccp/options.c
+++ b/net/dccp/options.c
@@ -23,23 +23,20 @@
 #include "dccp.h"
 #include "feat.h"
 
-int sysctl_dccp_feat_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW;
-int sysctl_dccp_feat_rx_ccid          = DCCPF_INITIAL_CCID;
-int sysctl_dccp_feat_tx_ccid          = DCCPF_INITIAL_CCID;
-int sysctl_dccp_feat_ack_ratio        = DCCPF_INITIAL_ACK_RATIO;
-int sysctl_dccp_feat_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR;
-int sysctl_dccp_feat_send_ndp_count  = DCCPF_INITIAL_SEND_NDP_COUNT;
-
-static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len)
+u64 dccp_decode_value_var(const u8 *bf, const u8 len)
 {
-        u32 value = 0;
+        u64 value = 0;
 
+        if (len >= DCCP_OPTVAL_MAXLEN)
+                value += ((u64)*bf++) << 40;
+        if (len > 4)
+                value += ((u64)*bf++) << 32;
         if (len > 3)
-                value += *bf++ << 24;
+                value += ((u64)*bf++) << 24;
         if (len > 2)
-                value += *bf++ << 16;
+                value += ((u64)*bf++) << 16;
         if (len > 1)
-                value += *bf++ << 8;
+                value += ((u64)*bf++) << 8;
         if (len > 0)
                 value += *bf;
 
@@ -57,7 +54,6 @@ int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
         struct dccp_sock *dp = dccp_sk(sk);
         const struct dccp_hdr *dh = dccp_hdr(skb);
         const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type;
-        u64 ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq;
         unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb);
         unsigned char *opt_ptr = options;
         const unsigned char *opt_end = (unsigned char *)dh +
@@ -99,18 +95,11 @@ int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
                 }
 
                 /*
-                 * CCID-Specific Options (from RFC 4340, sec. 10.3):
-                 *
-                 * Option numbers 128 through 191 are for options sent from the
-                 * HC-Sender to the HC-Receiver; option numbers 192 through 255
-                 * are for options sent from the HC-Receiver to the HC-Sender.
-                 *
                  * CCID-specific options are ignored during connection setup, as
                  * negotiation may still be in progress (see RFC 4340, 10.3).
                  * The same applies to Ack Vectors, as these depend on the CCID.
-                 *
                  */
-                if (dreq != NULL && (opt >= 128 ||
+                if (dreq != NULL && (opt >= DCCPO_MIN_RX_CCID_SPECIFIC ||
                     opt == DCCPO_ACK_VECTOR_0 || opt == DCCPO_ACK_VECTOR_1))
                         goto ignore_option;
 
@@ -131,43 +120,13 @@ int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
                         dccp_pr_debug("%s opt: NDP count=%llu\n", dccp_role(sk),
                                       (unsigned long long)opt_recv->dccpor_ndp);
                         break;
-                case DCCPO_CHANGE_L:
-                        /* fall through */
-                case DCCPO_CHANGE_R:
-                        if (pkt_type == DCCP_PKT_DATA)
+                case DCCPO_CHANGE_L ... DCCPO_CONFIRM_R:
+                        if (pkt_type == DCCP_PKT_DATA)      /* RFC 4340, 6 */
                                 break;
-                        if (len < 2)
-                                goto out_invalid_option;
-                        rc = dccp_feat_change_recv(sk, opt, *value, value + 1,
-                                                   len - 1);
-                        /*
-                         * When there is a change error, change_recv is
-                         * responsible for dealing with it.  i.e. reply with an
-                         * empty confirm.
-                         * If the change was mandatory, then we need to die.
-                         */
-                        if (rc && mandatory)
-                                goto out_invalid_option;
-                        break;
-                case DCCPO_CONFIRM_L:
-                        /* fall through */
-                case DCCPO_CONFIRM_R:
-                        if (pkt_type == DCCP_PKT_DATA)
-                                break;
-                        if (len < 2)    /* FIXME this disallows empty confirm */
-                                goto out_invalid_option;
-                        if (dccp_feat_confirm_recv(sk, opt, *value,
-                                                   value + 1, len - 1))
-                                goto out_invalid_option;
-                        break;
-                case DCCPO_ACK_VECTOR_0:
-                case DCCPO_ACK_VECTOR_1:
-                        if (dccp_packet_without_ack(skb))   /* RFC 4340, 11.4 */
-                                break;
-
-                        if (dccp_msk(sk)->dccpms_send_ack_vector &&
-                            dccp_ackvec_parse(sk, skb, &ackno, opt, value, len))
-                                goto out_invalid_option;
+                        rc = dccp_feat_parse_options(sk, dreq, mandatory, opt,
+                                                    *value, value + 1, len - 1);
+                        if (rc)
+                                goto out_featneg_failed;
                         break;
                 case DCCPO_TIMESTAMP:
                         if (len != 4)
@@ -195,6 +154,8 @@ int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
                                       dccp_role(sk), ntohl(opt_val),
                                       (unsigned long long)
                                       DCCP_SKB_CB(skb)->dccpd_ack_seq);
+                        /* schedule an Ack in case this sender is quiescent */
+                        inet_csk_schedule_ack(sk);
                         break;
                 case DCCPO_TIMESTAMP_ECHO:
                         if (len != 4 && len != 6 && len != 8)
@@ -251,23 +212,25 @@ int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
                         dccp_pr_debug("%s rx opt: ELAPSED_TIME=%d\n",
                                       dccp_role(sk), elapsed_time);
                         break;
-                case 128 ... 191: {
-                        const u16 idx = value - options;
-
+                case DCCPO_MIN_RX_CCID_SPECIFIC ... DCCPO_MAX_RX_CCID_SPECIFIC:
                         if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk,
-                                                     opt, len, idx,
-                                                     value) != 0)
+                                                     pkt_type, opt, value, len))
                                 goto out_invalid_option;
-                }
                         break;
-                case 192 ... 255: {
-                        const u16 idx = value - options;
-
+                case DCCPO_ACK_VECTOR_0:
+                case DCCPO_ACK_VECTOR_1:
+                        if (dccp_packet_without_ack(skb))   /* RFC 4340, 11.4 */
+                                break;
+                        /*
+                         * Ack vectors are processed by the TX CCID if it is
+                         * interested. The RX CCID need not parse Ack Vectors,
+                         * since it is only interested in clearing old state.
+                         * Fall through.
+                         */
+                case DCCPO_MIN_TX_CCID_SPECIFIC ... DCCPO_MAX_TX_CCID_SPECIFIC:
                         if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk,
-                                                     opt, len, idx,
-                                                     value) != 0)
+                                                     pkt_type, opt, value, len))
                                 goto out_invalid_option;
-                }
                         break;
                 default:
                         DCCP_CRIT("DCCP(%p): option %d(len=%d) not "
@@ -289,8 +252,10 @@ out_nonsensical_length:
 
 out_invalid_option:
         DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT);
-        DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR;
-        DCCP_WARN("DCCP(%p): invalid option %d, len=%d", sk, opt, len);
+        rc = DCCP_RESET_CODE_OPTION_ERROR;
+out_featneg_failed:
+        DCCP_WARN("DCCP(%p): Option %d (len=%d) error=%u\n", sk, opt, len, rc);
+        DCCP_SKB_CB(skb)->dccpd_reset_code = rc;
         DCCP_SKB_CB(skb)->dccpd_reset_data[0] = opt;
         DCCP_SKB_CB(skb)->dccpd_reset_data[1] = len > 0 ? value[0] : 0;
         DCCP_SKB_CB(skb)->dccpd_reset_data[2] = len > 1 ? value[1] : 0;
@@ -299,9 +264,12 @@ out_invalid_option:
 
 EXPORT_SYMBOL_GPL(dccp_parse_options);
 
-static void dccp_encode_value_var(const u32 value, unsigned char *to,
-                                  const unsigned int len)
+void dccp_encode_value_var(const u64 value, u8 *to, const u8 len)
 {
+        if (len >= DCCP_OPTVAL_MAXLEN)
+                *to++ = (value & 0xFF0000000000ull) >> 40;
+        if (len > 4)
+                *to++ = (value & 0xFF00000000ull) >> 32;
         if (len > 3)
                 *to++ = (value & 0xFF000000) >> 24;
         if (len > 2)
@@ -461,92 +429,140 @@ static int dccp_insert_option_timestamp_echo(struct dccp_sock *dp,
         return 0;
 }
 
-static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat,
-                                u8 *val, u8 len)
+static int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
 {
-        u8 *to;
+        struct dccp_sock *dp = dccp_sk(sk);
+        struct dccp_ackvec *av = dp->dccps_hc_rx_ackvec;
+        struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
+        const u16 buflen = dccp_ackvec_buflen(av);
+        /* Figure out how many options do we need to represent the ackvec */
+        const u8 nr_opts = DIV_ROUND_UP(buflen, DCCP_SINGLE_OPT_MAXLEN);
+        u16 len = buflen + 2 * nr_opts;
+        u8 i, nonce = 0;
+        const unsigned char *tail, *from;
+        unsigned char *to;
 
-        if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) {
-                DCCP_WARN("packet too small for feature %d option!\n", feat);
+        if (dcb->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) {
+                DCCP_WARN("Lacking space for %u bytes on %s packet\n", len,
+                          dccp_packet_name(dcb->dccpd_type));
                 return -1;
         }
+        /*
+         * Since Ack Vectors are variable-length, we can not always predict
+         * their size. To catch exception cases where the space is running out
+         * on the skb, a separate Sync is scheduled to carry the Ack Vector.
+         */
+        if (len > DCCPAV_MIN_OPTLEN &&
+            len + dcb->dccpd_opt_len + skb->len > dp->dccps_mss_cache) {
+                DCCP_WARN("No space left for Ack Vector (%u) on skb (%u+%u), "
+                          "MPS=%u ==> reduce payload size?\n", len, skb->len,
+                          dcb->dccpd_opt_len, dp->dccps_mss_cache);
+                dp->dccps_sync_scheduled = 1;
+                return 0;
+        }
+        dcb->dccpd_opt_len += len;
 
-        DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3;
+        to   = skb_push(skb, len);
+        len  = buflen;
+        from = av->av_buf + av->av_buf_head;
+        tail = av->av_buf + DCCPAV_MAX_ACKVEC_LEN;
 
-        to    = skb_push(skb, len + 3);
-        *to++ = type;
-        *to++ = len + 3;
-        *to++ = feat;
+        for (i = 0; i < nr_opts; ++i) {
+                int copylen = len;
 
-        if (len)
-                memcpy(to, val, len);
+                if (len > DCCP_SINGLE_OPT_MAXLEN)
+                        copylen = DCCP_SINGLE_OPT_MAXLEN;
+
+                /*
+                 * RFC 4340, 12.2: Encode the Nonce Echo for this Ack Vector via
+                 * its type; ack_nonce is the sum of all individual buf_nonce's.
+                 */
+                nonce ^= av->av_buf_nonce[i];
+
+                *to++ = DCCPO_ACK_VECTOR_0 + av->av_buf_nonce[i];
+                *to++ = copylen + 2;
 
-        dccp_pr_debug("%s(%s (%d), ...), length %d\n",
-                      dccp_feat_typename(type),
-                      dccp_feat_name(feat), feat, len);
+                /* Check if buf_head wraps */
+                if (from + copylen > tail) {
+                        const u16 tailsize = tail - from;
+
+                        memcpy(to, from, tailsize);
+                        to      += tailsize;
+                        len     -= tailsize;
+                        copylen -= tailsize;
+                        from    = av->av_buf;
+                }
+
+                memcpy(to, from, copylen);
+                from += copylen;
+                to   += copylen;
+                len  -= copylen;
+        }
+        /*
+         * Each sent Ack Vector is recorded in the list, as per A.2 of RFC 4340.
+         */
+        if (dccp_ackvec_update_records(av, dcb->dccpd_seq, nonce))
+                return -ENOBUFS;
         return 0;
 }
 
-static int dccp_insert_options_feat(struct sock *sk, struct sk_buff *skb)
+/**
+ * dccp_insert_option_mandatory  -  Mandatory option (5.8.2)
+ * Note that since we are using skb_push, this function needs to be called
+ * _after_ inserting the option it is supposed to influence (stack order).
+ */
+int dccp_insert_option_mandatory(struct sk_buff *skb)
 {
-        struct dccp_sock *dp = dccp_sk(sk);
-        struct dccp_minisock *dmsk = dccp_msk(sk);
-        struct dccp_opt_pend *opt, *next;
-        int change = 0;
-
-        /* confirm any options [NN opts] */
-        list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) {
-                dccp_insert_feat_opt(skb, opt->dccpop_type,
-                                     opt->dccpop_feat, opt->dccpop_val,
-                                     opt->dccpop_len);
-                /* fear empty confirms */
-                if (opt->dccpop_val)
-                        kfree(opt->dccpop_val);
-                kfree(opt);
-        }
-        INIT_LIST_HEAD(&dmsk->dccpms_conf);
-
-        /* see which features we need to send */
-        list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
-                /* see if we need to send any confirm */
-                if (opt->dccpop_sc) {
-                        dccp_insert_feat_opt(skb, opt->dccpop_type + 1,
-                                             opt->dccpop_feat,
-                                             opt->dccpop_sc->dccpoc_val,
-                                             opt->dccpop_sc->dccpoc_len);
-
-                        BUG_ON(!opt->dccpop_sc->dccpoc_val);
-                        kfree(opt->dccpop_sc->dccpoc_val);
-                        kfree(opt->dccpop_sc);
-                        opt->dccpop_sc = NULL;
-                }
+        if (DCCP_SKB_CB(skb)->dccpd_opt_len >= DCCP_MAX_OPT_LEN)
+                return -1;
 
-                /* any option not confirmed, re-send it */
-                if (!opt->dccpop_conf) {
-                        dccp_insert_feat_opt(skb, opt->dccpop_type,
-                                             opt->dccpop_feat, opt->dccpop_val,
-                                             opt->dccpop_len);
-                        change++;
-                }
+        DCCP_SKB_CB(skb)->dccpd_opt_len++;
+        *skb_push(skb, 1) = DCCPO_MANDATORY;
+        return 0;
+}
+
+/**
+ * dccp_insert_fn_opt  -  Insert single Feature-Negotiation option into @skb
+ * @type: %DCCPO_CHANGE_L, %DCCPO_CHANGE_R, %DCCPO_CONFIRM_L, %DCCPO_CONFIRM_R
+ * @feat: one out of %dccp_feature_numbers
+ * @val: NN value or SP array (preferred element first) to copy
+ * @len: true length of @val in bytes (excluding first element repetition)
+ * @repeat_first: whether to copy the first element of @val twice
+ * The last argument is used to construct Confirm options, where the preferred
+ * value and the preference list appear separately (RFC 4340, 6.3.1). Preference
+ * lists are kept such that the preferred entry is always first, so we only need
+ * to copy twice, and avoid the overhead of cloning into a bigger array.
+ */
+int dccp_insert_fn_opt(struct sk_buff *skb, u8 type, u8 feat,
+                       u8 *val, u8 len, bool repeat_first)
+{
+        u8 tot_len, *to;
+
+        /* take the `Feature' field and possible repetition into account */
+        if (len > (DCCP_SINGLE_OPT_MAXLEN - 2)) {
+                DCCP_WARN("length %u for feature %u too large\n", len, feat);
+                return -1;
         }
 
-        /* Retransmit timer.
-         * If this is the master listening sock, we don't set a timer on it.  It
-         * should be fine because if the dude doesn't receive our RESPONSE
-         * [which will contain the CHANGE] he will send another REQUEST which
-         * will "retrnasmit" the change.
-         */
-        if (change && dp->dccps_role != DCCP_ROLE_LISTEN) {
-                dccp_pr_debug("reset feat negotiation timer %p\n", sk);
+        if (unlikely(val == NULL || len == 0))
+                len = repeat_first = 0;
+        tot_len = 3 + repeat_first + len;
 
-                /* XXX don't reset the timer on re-transmissions.  I.e. reset it
-                 * only when sending new stuff i guess.  Currently the timer
-                 * never backs off because on re-transmission it just resets it!
-                 */
-                inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
-                                          inet_csk(sk)->icsk_rto, DCCP_RTO_MAX);
+        if (DCCP_SKB_CB(skb)->dccpd_opt_len + tot_len > DCCP_MAX_OPT_LEN) {
+                DCCP_WARN("packet too small for feature %d option!\n", feat);
+                return -1;
         }
+        DCCP_SKB_CB(skb)->dccpd_opt_len += tot_len;
+
+        to    = skb_push(skb, tot_len);
+        *to++ = type;
+        *to++ = tot_len;
+        *to++ = feat;
 
+        if (repeat_first)
+                *to++ = *val;
+        if (len)
+                memcpy(to, val, len);
         return 0;
 }
 
@@ -565,19 +581,30 @@ static void dccp_insert_option_padding(struct sk_buff *skb)
 int dccp_insert_options(struct sock *sk, struct sk_buff *skb)
 {
         struct dccp_sock *dp = dccp_sk(sk);
-        struct dccp_minisock *dmsk = dccp_msk(sk);
 
         DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
 
-        if (dmsk->dccpms_send_ndp_count &&
-            dccp_insert_option_ndp(sk, skb))
+        if (dp->dccps_send_ndp_count && dccp_insert_option_ndp(sk, skb))
                 return -1;
 
-        if (!dccp_packet_without_ack(skb)) {
-                if (dmsk->dccpms_send_ack_vector &&
-                    dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) &&
-                    dccp_insert_option_ackvec(sk, skb))
+        if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA) {
+
+                /* Feature Negotiation */
+                if (dccp_feat_insert_opts(dp, NULL, skb))
                         return -1;
+
+                if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST) {
+                        /*
+                         * Obtain RTT sample from Request/Response exchange.
+                         * This is currently used in CCID 3 initialisation.
+                         */
+                        if (dccp_insert_option_timestamp(sk, skb))
+                                return -1;
+
+                } else if (dccp_ackvec_pending(sk) &&
+                           dccp_insert_option_ackvec(sk, skb)) {
+                                return -1;
+                }
         }
 
         if (dp->dccps_hc_rx_insert_options) {
@@ -586,21 +613,6 @@ int dccp_insert_options(struct sock *sk, struct sk_buff *skb)
                 dp->dccps_hc_rx_insert_options = 0;
         }
 
-        /* Feature negotiation */
-        /* Data packets can't do feat negotiation */
-        if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA &&
-            DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATAACK &&
-            dccp_insert_options_feat(sk, skb))
-                return -1;
-
-        /*
-         * Obtain RTT sample from Request/Response exchange.
-         * This is currently used in CCID 3 initialisation.
-         */
-        if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST &&
-            dccp_insert_option_timestamp(sk, skb))
-                return -1;
-
         if (dp->dccps_timestamp_echo != 0 &&
             dccp_insert_option_timestamp_echo(dp, NULL, skb))
                 return -1;
@@ -613,6 +625,9 @@ int dccp_insert_options_rsk(struct dccp_request_sock *dreq, struct sk_buff *skb)
 {
         DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
 
+        if (dccp_feat_insert_opts(NULL, dreq, skb))
+                return -1;
+
         if (dreq->dreq_timestamp_echo != 0 &&
             dccp_insert_option_timestamp_echo(NULL, dreq, skb))
                 return -1;
diff --git a/net/dccp/output.c b/net/dccp/output.c
index d06945c7d3df..2532797a8009 100644
--- a/net/dccp/output.c
+++ b/net/dccp/output.c
@@ -26,11 +26,13 @@ static inline void dccp_event_ack_sent(struct sock *sk)
         inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK);
 }
 
-static void dccp_skb_entail(struct sock *sk, struct sk_buff *skb)
+/* enqueue @skb on sk_send_head for retransmission, return clone to send now */
+static struct sk_buff *dccp_skb_entail(struct sock *sk, struct sk_buff *skb)
 {
         skb_set_owner_w(skb, sk);
         WARN_ON(sk->sk_send_head);
         sk->sk_send_head = skb;
+        return skb_clone(sk->sk_send_head, gfp_any());
 }
 
 /*
@@ -161,21 +163,27 @@ unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu)
         struct inet_connection_sock *icsk = inet_csk(sk);
         struct dccp_sock *dp = dccp_sk(sk);
         u32 ccmps = dccp_determine_ccmps(dp);
-        int cur_mps = ccmps ? min(pmtu, ccmps) : pmtu;
+        u32 cur_mps = ccmps ? min(pmtu, ccmps) : pmtu;
 
         /* Account for header lengths and IPv4/v6 option overhead */
         cur_mps -= (icsk->icsk_af_ops->net_header_len + icsk->icsk_ext_hdr_len +
                     sizeof(struct dccp_hdr) + sizeof(struct dccp_hdr_ext));
 
         /*
-         * FIXME: this should come from the CCID infrastructure, where, say,
-         * TFRC will say it wants TIMESTAMPS, ELAPSED time, etc, for now lets
-         * put a rough estimate for NDP + TIMESTAMP + TIMESTAMP_ECHO + ELAPSED
-         * TIME + TFRC_OPT_LOSS_EVENT_RATE + TFRC_OPT_RECEIVE_RATE + padding to
-         * make it a multiple of 4
+         * Leave enough headroom for common DCCP header options.
+         * This only considers options which may appear on DCCP-Data packets, as
+         * per table 3 in RFC 4340, 5.8. When running out of space for other
+         * options (eg. Ack Vector which can take up to 255 bytes), it is better
+         * to schedule a separate Ack. Thus we leave headroom for the following:
+         *  - 1 byte for Slow Receiver (11.6)
+         *  - 6 bytes for Timestamp (13.1)
+         *  - 10 bytes for Timestamp Echo (13.3)
+         *  - 8 bytes for NDP count (7.7, when activated)
+         *  - 6 bytes for Data Checksum (9.3)
+         *  - %DCCPAV_MIN_OPTLEN bytes for Ack Vector size (11.4, when enabled)
          */
-
-        cur_mps -= ((5 + 6 + 10 + 6 + 6 + 6 + 3) / 4) * 4;
+        cur_mps -= roundup(1 + 6 + 10 + dp->dccps_send_ndp_count * 8 + 6 +
+                           (dp->dccps_hc_rx_ackvec ? DCCPAV_MIN_OPTLEN : 0), 4);
 
         /* And store cached results */
         icsk->icsk_pmtu_cookie = pmtu;
@@ -200,95 +208,158 @@ void dccp_write_space(struct sock *sk)
 }
 
 /**
- * dccp_wait_for_ccid - Wait for ccid to tell us we can send a packet
+ * dccp_wait_for_ccid  -  Await CCID send permission
  * @sk:    socket to wait for
- * @skb:   current skb to pass on for waiting
- * @delay: sleep timeout in milliseconds (> 0)
- * This function is called by default when the socket is closed, and
- * when a non-zero linger time is set on the socket. For consistency
+ * @delay: timeout in jiffies
+ * This is used by CCIDs which need to delay the send time in process context.
  */
-static int dccp_wait_for_ccid(struct sock *sk, struct sk_buff *skb, int delay)
+static int dccp_wait_for_ccid(struct sock *sk, unsigned long delay)
 {
-        struct dccp_sock *dp = dccp_sk(sk);
         DEFINE_WAIT(wait);
-        unsigned long jiffdelay;
-        int rc;
+        long remaining;
 
-        do {
-                dccp_pr_debug("delayed send by %d msec\n", delay);
-                jiffdelay = msecs_to_jiffies(delay);
+        prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
+        sk->sk_write_pending++;
+        release_sock(sk);
 
-                prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
+        remaining = schedule_timeout(delay);
 
-                sk->sk_write_pending++;
-                release_sock(sk);
-                schedule_timeout(jiffdelay);
-                lock_sock(sk);
-                sk->sk_write_pending--;
+        lock_sock(sk);
+        sk->sk_write_pending--;
+        finish_wait(sk->sk_sleep, &wait);
 
-                if (sk->sk_err)
-                        goto do_error;
-                if (signal_pending(current))
-                        goto do_interrupted;
+        if (signal_pending(current) || sk->sk_err)
+                return -1;
+        return remaining;
+}
 
-                rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb);
-        } while ((delay = rc) > 0);
-out:
-        finish_wait(sk->sk_sleep, &wait);
-        return rc;
-
-do_error:
-        rc = -EPIPE;
-        goto out;
-do_interrupted:
-        rc = -EINTR;
-        goto out;
+/**
+ * dccp_xmit_packet  -  Send data packet under control of CCID
+ * Transmits next-queued payload and informs CCID to account for the packet.
+ */
+static void dccp_xmit_packet(struct sock *sk)
+{
+        int err, len;
+        struct dccp_sock *dp = dccp_sk(sk);
+        struct sk_buff *skb = dccp_qpolicy_pop(sk);
+
+        if (unlikely(skb == NULL))
+                return;
+        len = skb->len;
+
+        if (sk->sk_state == DCCP_PARTOPEN) {
+                const u32 cur_mps = dp->dccps_mss_cache - DCCP_FEATNEG_OVERHEAD;
+                /*
+                 * See 8.1.5 - Handshake Completion.
+                 *
+                 * For robustness we resend Confirm options until the client has
+                 * entered OPEN. During the initial feature negotiation, the MPS
+                 * is smaller than usual, reduced by the Change/Confirm options.
+                 */
+                if (!list_empty(&dp->dccps_featneg) && len > cur_mps) {
+                        DCCP_WARN("Payload too large (%d) for featneg.\n", len);
+                        dccp_send_ack(sk);
+                        dccp_feat_list_purge(&dp->dccps_featneg);
+                }
+
+                inet_csk_schedule_ack(sk);
+                inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
+                                              inet_csk(sk)->icsk_rto,
+                                              DCCP_RTO_MAX);
+                DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_DATAACK;
+        } else if (dccp_ack_pending(sk)) {
+                DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_DATAACK;
+        } else {
+                DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_DATA;
+        }
+
+        err = dccp_transmit_skb(sk, skb);
+        if (err)
+                dccp_pr_debug("transmit_skb() returned err=%d\n", err);
+        /*
+         * Register this one as sent even if an error occurred. To the remote
+         * end a local packet drop is indistinguishable from network loss, i.e.
+         * any local drop will eventually be reported via receiver feedback.
+         */
+        ccid_hc_tx_packet_sent(dp->dccps_hc_tx_ccid, sk, len);
+
+        /*
+         * If the CCID needs to transfer additional header options out-of-band
+         * (e.g. Ack Vectors or feature-negotiation options), it activates this
+         * flag to schedule a Sync. The Sync will automatically incorporate all
+         * currently pending header options, thus clearing the backlog.
+         */
+        if (dp->dccps_sync_scheduled)
+                dccp_send_sync(sk, dp->dccps_gsr, DCCP_PKT_SYNC);
 }
 
-void dccp_write_xmit(struct sock *sk, int block)
+/**
+ * dccp_flush_write_queue  -  Drain queue at end of connection
+ * Since dccp_sendmsg queues packets without waiting for them to be sent, it may
+ * happen that the TX queue is not empty at the end of a connection. We give the
+ * HC-sender CCID a grace period of up to @time_budget jiffies. If this function
+ * returns with a non-empty write queue, it will be purged later.
+ */
+void dccp_flush_write_queue(struct sock *sk, long *time_budget)
 {
         struct dccp_sock *dp = dccp_sk(sk);
         struct sk_buff *skb;
+        long delay, rc;
+
+        while (*time_budget > 0 && (skb = skb_peek(&sk->sk_write_queue))) {
+                rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb);
 
-        while ((skb = skb_peek(&sk->sk_write_queue))) {
-                int err = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb);
-
-                if (err > 0) {
-                        if (!block) {
-                                sk_reset_timer(sk, &dp->dccps_xmit_timer,
-                                                msecs_to_jiffies(err)+jiffies);
-                                break;
-                        } else
-                                err = dccp_wait_for_ccid(sk, skb, err);
-                        if (err && err != -EINTR)
-                                DCCP_BUG("err=%d after dccp_wait_for_ccid", err);
+                switch (ccid_packet_dequeue_eval(rc)) {
+                case CCID_PACKET_WILL_DEQUEUE_LATER:
+                        /*
+                         * If the CCID determines when to send, the next sending
+                         * time is unknown or the CCID may not even send again
+                         * (e.g. remote host crashes or lost Ack packets).
+                         */
+                        DCCP_WARN("CCID did not manage to send all packets\n");
+                        return;
+                case CCID_PACKET_DELAY:
+                        delay = msecs_to_jiffies(rc);
+                        if (delay > *time_budget)
+                                return;
+                        rc = dccp_wait_for_ccid(sk, delay);
+                        if (rc < 0)
+                                return;
+                        *time_budget -= (delay - rc);
+                        /* check again if we can send now */
+                        break;
+                case CCID_PACKET_SEND_AT_ONCE:
+                        dccp_xmit_packet(sk);
+                        break;
+                case CCID_PACKET_ERR:
+                        skb_dequeue(&sk->sk_write_queue);
+                        kfree_skb(skb);
+                        dccp_pr_debug("packet discarded due to err=%ld\n", rc);
                 }
+        }
+}
 
-                skb_dequeue(&sk->sk_write_queue);
-                if (err == 0) {
-                        struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
-                        const int len = skb->len;
+void dccp_write_xmit(struct sock *sk)
+{
+        struct dccp_sock *dp = dccp_sk(sk);
+        struct sk_buff *skb;
 
-                        if (sk->sk_state == DCCP_PARTOPEN) {
-                                /* See 8.1.5.  Handshake Completion */
-                                inet_csk_schedule_ack(sk);
-                                inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
-                                                  inet_csk(sk)->icsk_rto,
-                                                  DCCP_RTO_MAX);
-                                dcb->dccpd_type = DCCP_PKT_DATAACK;
-                        } else if (dccp_ack_pending(sk))
-                                dcb->dccpd_type = DCCP_PKT_DATAACK;
-                        else
-                                dcb->dccpd_type = DCCP_PKT_DATA;
-
-                        err = dccp_transmit_skb(sk, skb);
-                        ccid_hc_tx_packet_sent(dp->dccps_hc_tx_ccid, sk, 0, len);
-                        if (err)
-                                DCCP_BUG("err=%d after ccid_hc_tx_packet_sent",
-                                         err);
-                } else {
-                        dccp_pr_debug("packet discarded due to err=%d\n", err);
-                        kfree_skb(skb);
+        while ((skb = dccp_qpolicy_top(sk))) {
+                int rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb);
+
+                switch (ccid_packet_dequeue_eval(rc)) {
+                case CCID_PACKET_WILL_DEQUEUE_LATER:
+                        return;
+                case CCID_PACKET_DELAY:
+                        sk_reset_timer(sk, &dp->dccps_xmit_timer,
+                                       jiffies + msecs_to_jiffies(rc));
+                        return;
+                case CCID_PACKET_SEND_AT_ONCE:
+                        dccp_xmit_packet(sk);
+                        break;
+                case CCID_PACKET_ERR:
+                        dccp_qpolicy_drop(sk, skb);
+                        dccp_pr_debug("packet discarded due to err=%d\n", rc);
                 }
         }
 }
@@ -339,10 +410,12 @@ struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst,
         DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESPONSE;
         DCCP_SKB_CB(skb)->dccpd_seq  = dreq->dreq_iss;
 
-        if (dccp_insert_options_rsk(dreq, skb)) {
-                kfree_skb(skb);
-                return NULL;
-        }
+        /* Resolve feature dependencies resulting from choice of CCID */
+        if (dccp_feat_server_ccid_dependencies(dreq))
+                goto response_failed;
+
+        if (dccp_insert_options_rsk(dreq, skb))
+                goto response_failed;
 
         /* Build and checksum header */
         dh = dccp_zeroed_hdr(skb, dccp_header_size);
@@ -363,6 +436,9 @@ struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst,
         inet_rsk(req)->acked = 1;
         DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
         return skb;
+response_failed:
+        kfree_skb(skb);
+        return NULL;
 }
 
 EXPORT_SYMBOL_GPL(dccp_make_response);
@@ -447,8 +523,9 @@ int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code)
 /*
  * Do all connect socket setups that can be done AF independent.
  */
-static inline void dccp_connect_init(struct sock *sk)
+int dccp_connect(struct sock *sk)
 {
+        struct sk_buff *skb;
         struct dccp_sock *dp = dccp_sk(sk);
         struct dst_entry *dst = __sk_dst_get(sk);
         struct inet_connection_sock *icsk = inet_csk(sk);
@@ -458,19 +535,13 @@ static inline void dccp_connect_init(struct sock *sk)
 
         dccp_sync_mss(sk, dst_mtu(dst));
 
+        /* do not connect if feature negotiation setup fails */
+        if (dccp_feat_finalise_settings(dccp_sk(sk)))
+                return -EPROTO;
+
         /* Initialise GAR as per 8.5; AWL/AWH are set in dccp_transmit_skb() */
         dp->dccps_gar = dp->dccps_iss;
 
-        icsk->icsk_retransmits = 0;
-}
-
-int dccp_connect(struct sock *sk)
-{
-        struct sk_buff *skb;
-        struct inet_connection_sock *icsk = inet_csk(sk);
-
-        dccp_connect_init(sk);
-
         skb = alloc_skb(sk->sk_prot->max_header, sk->sk_allocation);
         if (unlikely(skb == NULL))
                 return -ENOBUFS;
@@ -480,11 +551,11 @@ int dccp_connect(struct sock *sk)
 
         DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_REQUEST;
 
-        dccp_skb_entail(sk, skb);
-        dccp_transmit_skb(sk, skb_clone(skb, GFP_KERNEL));
+        dccp_transmit_skb(sk, dccp_skb_entail(sk, skb));
         DCCP_INC_STATS(DCCP_MIB_ACTIVEOPENS);
 
         /* Timer for repeating the REQUEST until an answer. */
+        icsk->icsk_retransmits = 0;
         inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
                                   icsk->icsk_rto, DCCP_RTO_MAX);
         return 0;
@@ -571,6 +642,12 @@ void dccp_send_sync(struct sock *sk, const u64 ackno,
         DCCP_SKB_CB(skb)->dccpd_type = pkt_type;
         DCCP_SKB_CB(skb)->dccpd_ack_seq = ackno;
 
+        /*
+         * Clear the flag in case the Sync was scheduled for out-of-band data,
+         * such as carrying a long Ack Vector.
+         */
+        dccp_sk(sk)->dccps_sync_scheduled = 0;
+
         dccp_transmit_skb(sk, skb);
 }
 
@@ -599,9 +676,7 @@ void dccp_send_close(struct sock *sk, const int active)
                 DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_CLOSE;
 
         if (active) {
-                dccp_write_xmit(sk, 1);
-                dccp_skb_entail(sk, skb);
-                dccp_transmit_skb(sk, skb_clone(skb, prio));
+                skb = dccp_skb_entail(sk, skb);
                 /*
                  * Retransmission timer for active-close: RFC 4340, 8.3 requires
                  * to retransmit the Close/CloseReq until the CLOSING/CLOSEREQ
@@ -614,6 +689,6 @@ void dccp_send_close(struct sock *sk, const int active)
                  */
                 inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
                                           DCCP_TIMEOUT_INIT, DCCP_RTO_MAX);
-        } else
-                dccp_transmit_skb(sk, skb);
+        }
+        dccp_transmit_skb(sk, skb);
 }
diff --git a/net/dccp/probe.c b/net/dccp/probe.c
index 81368a7f5379..eaa59d82ab0f 100644
--- a/net/dccp/probe.c
+++ b/net/dccp/probe.c
@@ -46,75 +46,54 @@ static struct {
         struct kfifo      *fifo;
         spinlock_t        lock;
         wait_queue_head_t wait;
-        struct timespec   tstart;
+        ktime_t           start;
 } dccpw;
 
-static void printl(const char *fmt, ...)
+static void jdccp_write_xmit(struct sock *sk)
 {
-        va_list args;
-        int len;
-        struct timespec now;
-        char tbuf[256];
-
-        va_start(args, fmt);
-        getnstimeofday(&now);
-
-        now = timespec_sub(now, dccpw.tstart);
-
-        len = sprintf(tbuf, "%lu.%06lu ",
-                      (unsigned long) now.tv_sec,
-                      (unsigned long) now.tv_nsec / NSEC_PER_USEC);
-        len += vscnprintf(tbuf+len, sizeof(tbuf)-len, fmt, args);
-        va_end(args);
-
-        kfifo_put(dccpw.fifo, tbuf, len);
-        wake_up(&dccpw.wait);
-}
-
-static int jdccp_sendmsg(struct kiocb *iocb, struct sock *sk,
-                         struct msghdr *msg, size_t size)
-{
-        const struct dccp_minisock *dmsk = dccp_msk(sk);
         const struct inet_sock *inet = inet_sk(sk);
-        const struct ccid3_hc_tx_sock *hctx;
+        struct ccid3_hc_tx_sock *hctx = NULL;
+        struct timespec tv;
+        char buf[256];
+        int len, ccid = ccid_get_current_tx_ccid(dccp_sk(sk));
 
-        if (dmsk->dccpms_tx_ccid == DCCPC_CCID3)
+        if (ccid == DCCPC_CCID3)
                 hctx = ccid3_hc_tx_sk(sk);
-        else
-                hctx = NULL;
 
-        if (port == 0 || ntohs(inet->dport) == port ||
-            ntohs(inet->sport) == port) {
-                if (hctx)
-                        printl("%d.%d.%d.%d:%u %d.%d.%d.%d:%u %d %d %d %d %u "
-                               "%llu %llu %d\n",
-                               NIPQUAD(inet->saddr), ntohs(inet->sport),
-                               NIPQUAD(inet->daddr), ntohs(inet->dport), size,
-                               hctx->ccid3hctx_s, hctx->ccid3hctx_rtt,
-                               hctx->ccid3hctx_p, hctx->ccid3hctx_x_calc,
-                               hctx->ccid3hctx_x_recv >> 6,
-                               hctx->ccid3hctx_x >> 6, hctx->ccid3hctx_t_ipi);
-                else
-                        printl("%d.%d.%d.%d:%u %d.%d.%d.%d:%u %d\n",
+        if (!port || ntohs(inet->dport) == port || ntohs(inet->sport) == port) {
+
+                tv  = ktime_to_timespec(ktime_sub(ktime_get(), dccpw.start));
+                len = sprintf(buf, "%lu.%09lu %d.%d.%d.%d:%u %d.%d.%d.%d:%u %d",
+                               (unsigned long)tv.tv_sec,
+                               (unsigned long)tv.tv_nsec,
                                NIPQUAD(inet->saddr), ntohs(inet->sport),
-                               NIPQUAD(inet->daddr), ntohs(inet->dport), size);
+                               NIPQUAD(inet->daddr), ntohs(inet->dport), ccid);
+
+                if (hctx)
+                        len += sprintf(buf + len, " %d %d %d %u %u %u %d",
+                               hctx->s, hctx->rtt, hctx->p, hctx->x_calc,
+                               (unsigned)(hctx->x_recv >> 6),
+                               (unsigned)(hctx->x >> 6), hctx->t_ipi);
+
+                len += sprintf(buf + len, "\n");
+                kfifo_put(dccpw.fifo, buf, len);
+                wake_up(&dccpw.wait);
         }
 
         jprobe_return();
-        return 0;
 }
 
 static struct jprobe dccp_send_probe = {
         .kp     = {
-                .symbol_name = "dccp_sendmsg",
+                .symbol_name = "dccp_write_xmit",
         },
-        .entry  = jdccp_sendmsg,
+        .entry  = jdccp_write_xmit,
 };
 
 static int dccpprobe_open(struct inode *inode, struct file *file)
 {
         kfifo_reset(dccpw.fifo);
-        getnstimeofday(&dccpw.tstart);
+        dccpw.start = ktime_get();
         return 0;
 }
 
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index d0bd34819761..ecf3be961e11 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -67,6 +67,9 @@ void dccp_set_state(struct sock *sk, const int state)
         case DCCP_OPEN:
                 if (oldstate != DCCP_OPEN)
                         DCCP_INC_STATS(DCCP_MIB_CURRESTAB);
+                /* Client retransmits all Confirm options until entering OPEN */
+                if (oldstate == DCCP_PARTOPEN)
+                        dccp_feat_list_purge(&dccp_sk(sk)->dccps_featneg);
                 break;
 
         case DCCP_CLOSED:
@@ -175,63 +178,25 @@ EXPORT_SYMBOL_GPL(dccp_state_name);
 int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized)
 {
         struct dccp_sock *dp = dccp_sk(sk);
-        struct dccp_minisock *dmsk = dccp_msk(sk);
         struct inet_connection_sock *icsk = inet_csk(sk);
 
-        dccp_minisock_init(&dp->dccps_minisock);
-
         icsk->icsk_rto          = DCCP_TIMEOUT_INIT;
         icsk->icsk_syn_retries  = sysctl_dccp_request_retries;
         sk->sk_state            = DCCP_CLOSED;
         sk->sk_write_space      = dccp_write_space;
         icsk->icsk_sync_mss     = dccp_sync_mss;
-        dp->dccps_mss_cache     = 536;
+        dp->dccps_mss_cache     = TCP_MIN_RCVMSS;
         dp->dccps_rate_last     = jiffies;
         dp->dccps_role          = DCCP_ROLE_UNDEFINED;
         dp->dccps_service       = DCCP_SERVICE_CODE_IS_ABSENT;
-        dp->dccps_l_ack_ratio   = dp->dccps_r_ack_ratio = 1;
+        dp->dccps_tx_qlen       = sysctl_dccp_tx_qlen;
 
         dccp_init_xmit_timers(sk);
 
-        /*
-         * FIXME: We're hardcoding the CCID, and doing this at this point makes
-         * the listening (master) sock get CCID control blocks, which is not
-         * necessary, but for now, to not mess with the test userspace apps,
-         * lets leave it here, later the real solution is to do this in a
-         * setsockopt(CCIDs-I-want/accept). -acme
-         */
-        if (likely(ctl_sock_initialized)) {
-                int rc = dccp_feat_init(dmsk);
-
-                if (rc)
-                        return rc;
-
-                if (dmsk->dccpms_send_ack_vector) {
-                        dp->dccps_hc_rx_ackvec = dccp_ackvec_alloc(GFP_KERNEL);
-                        if (dp->dccps_hc_rx_ackvec == NULL)
-                                return -ENOMEM;
-                }
-                dp->dccps_hc_rx_ccid = ccid_hc_rx_new(dmsk->dccpms_rx_ccid,
-                                                      sk, GFP_KERNEL);
-                dp->dccps_hc_tx_ccid = ccid_hc_tx_new(dmsk->dccpms_tx_ccid,
-                                                      sk, GFP_KERNEL);
-                if (unlikely(dp->dccps_hc_rx_ccid == NULL ||
-                             dp->dccps_hc_tx_ccid == NULL)) {
-                        ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk);
-                        ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk);
-                        if (dmsk->dccpms_send_ack_vector) {
-                                dccp_ackvec_free(dp->dccps_hc_rx_ackvec);
-                                dp->dccps_hc_rx_ackvec = NULL;
-                        }
-                        dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL;
-                        return -ENOMEM;
-                }
-        } else {
-                /* control socket doesn't need feat nego */
-                INIT_LIST_HEAD(&dmsk->dccpms_pending);
-                INIT_LIST_HEAD(&dmsk->dccpms_conf);
-        }
-
+        INIT_LIST_HEAD(&dp->dccps_featneg);
+        /* control socket doesn't need feat nego */
+        if (likely(ctl_sock_initialized))
+                return dccp_feat_init(sk);
         return 0;
 }
 
@@ -240,7 +205,6 @@ EXPORT_SYMBOL_GPL(dccp_init_sock);
 void dccp_destroy_sock(struct sock *sk)
 {
         struct dccp_sock *dp = dccp_sk(sk);
-        struct dccp_minisock *dmsk = dccp_msk(sk);
 
         /*
          * DCCP doesn't use sk_write_queue, just sk_send_head
@@ -258,7 +222,7 @@ void dccp_destroy_sock(struct sock *sk)
         kfree(dp->dccps_service_list);
         dp->dccps_service_list = NULL;
 
-        if (dmsk->dccpms_send_ack_vector) {
+        if (dp->dccps_hc_rx_ackvec != NULL) {
                 dccp_ackvec_free(dp->dccps_hc_rx_ackvec);
                 dp->dccps_hc_rx_ackvec = NULL;
         }
@@ -267,7 +231,7 @@ void dccp_destroy_sock(struct sock *sk)
         dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL;
 
         /* clean up feature negotiation state */
-        dccp_feat_clean(dmsk);
+        dccp_feat_list_purge(&dp->dccps_featneg);
 }
 
 EXPORT_SYMBOL_GPL(dccp_destroy_sock);
@@ -277,6 +241,9 @@ static inline int dccp_listen_start(struct sock *sk, int backlog)
         struct dccp_sock *dp = dccp_sk(sk);
 
         dp->dccps_role = DCCP_ROLE_LISTEN;
+        /* do not start to listen if feature negotiation setup fails */
+        if (dccp_feat_finalise_settings(dp))
+                return -EPROTO;
         return inet_csk_listen_start(sk, backlog);
 }
 
@@ -466,42 +433,70 @@ static int dccp_setsockopt_service(struct sock *sk, const __be32 service,
         return 0;
 }
 
-/* byte 1 is feature.  the rest is the preference list */
-static int dccp_setsockopt_change(struct sock *sk, int type,
-                                  struct dccp_so_feat __user *optval)
+static int dccp_setsockopt_cscov(struct sock *sk, int cscov, bool rx)
 {
-        struct dccp_so_feat opt;
-        u8 *val;
-        int rc;
+        u8 *list, len;
+        int i, rc;
 
-        if (copy_from_user(&opt, optval, sizeof(opt)))
-                return -EFAULT;
+        if (cscov < 0 || cscov > 15)
+                return -EINVAL;
         /*
-         * rfc4340: 6.1. Change Options
+         * Populate a list of permissible values, in the range cscov...15. This
+         * is necessary since feature negotiation of single values only works if
+         * both sides incidentally choose the same value. Since the list starts
+         * lowest-value first, negotiation will pick the smallest shared value.
          */
-        if (opt.dccpsf_len < 1)
+        if (cscov == 0)
+                return 0;
+        len = 16 - cscov;
+
+        list = kmalloc(len, GFP_KERNEL);
+        if (list == NULL)
+                return -ENOBUFS;
+
+        for (i = 0; i < len; i++)
+                list[i] = cscov++;
+
+        rc = dccp_feat_register_sp(sk, DCCPF_MIN_CSUM_COVER, rx, list, len);
+
+        if (rc == 0) {
+                if (rx)
+                        dccp_sk(sk)->dccps_pcrlen = cscov;
+                else
+                        dccp_sk(sk)->dccps_pcslen = cscov;
+        }
+        kfree(list);
+        return rc;
+}
+
+static int dccp_setsockopt_ccid(struct sock *sk, int type,
+                                char __user *optval, int optlen)
+{
+        u8 *val;
+        int rc = 0;
+
+        if (optlen < 1 || optlen > DCCP_FEAT_MAX_SP_VALS)
                 return -EINVAL;
 
-        val = kmalloc(opt.dccpsf_len, GFP_KERNEL);
-        if (!val)
+        val = kmalloc(optlen, GFP_KERNEL);
+        if (val == NULL)
                 return -ENOMEM;
 
-        if (copy_from_user(val, opt.dccpsf_val, opt.dccpsf_len)) {
-                rc = -EFAULT;
-                goto out_free_val;
+        if (copy_from_user(val, optval, optlen)) {
+                kfree(val);
+                return -EFAULT;
         }
 
-        rc = dccp_feat_change(dccp_msk(sk), type, opt.dccpsf_feat,
-                              val, opt.dccpsf_len, GFP_KERNEL);
-        if (rc)
-                goto out_free_val;
+        lock_sock(sk);
+        if (type == DCCP_SOCKOPT_TX_CCID || type == DCCP_SOCKOPT_CCID)
+                rc = dccp_feat_register_sp(sk, DCCPF_CCID, 1, val, optlen);
 
-out:
-        return rc;
+        if (!rc && (type == DCCP_SOCKOPT_RX_CCID || type == DCCP_SOCKOPT_CCID))
+                rc = dccp_feat_register_sp(sk, DCCPF_CCID, 0, val, optlen);
+        release_sock(sk);
 
-out_free_val:
         kfree(val);
-        goto out;
+        return rc;
 }
 
 static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
@@ -510,7 +505,21 @@ static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
         struct dccp_sock *dp = dccp_sk(sk);
         int val, err = 0;
 
-        if (optlen < sizeof(int))
+        switch (optname) {
+        case DCCP_SOCKOPT_PACKET_SIZE:
+                DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n");
+                return 0;
+        case DCCP_SOCKOPT_CHANGE_L:
+        case DCCP_SOCKOPT_CHANGE_R:
+                DCCP_WARN("sockopt(CHANGE_L/R) is deprecated: fix your app\n");
+                return 0;
+        case DCCP_SOCKOPT_CCID:
+        case DCCP_SOCKOPT_RX_CCID:
+        case DCCP_SOCKOPT_TX_CCID:
+                return dccp_setsockopt_ccid(sk, optname, optval, optlen);
+        }
+
+        if (optlen < (int)sizeof(int))
                 return -EINVAL;
 
         if (get_user(val, (int __user *)optval))
@@ -521,53 +530,38 @@ static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
 
         lock_sock(sk);
         switch (optname) {
-        case DCCP_SOCKOPT_PACKET_SIZE:
-                DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n");
-                err = 0;
-                break;
-        case DCCP_SOCKOPT_CHANGE_L:
-                if (optlen != sizeof(struct dccp_so_feat))
-                        err = -EINVAL;
-                else
-                        err = dccp_setsockopt_change(sk, DCCPO_CHANGE_L,
-                                                     (struct dccp_so_feat __user *)
-                                                     optval);
-                break;
-        case DCCP_SOCKOPT_CHANGE_R:
-                if (optlen != sizeof(struct dccp_so_feat))
-                        err = -EINVAL;
-                else
-                        err = dccp_setsockopt_change(sk, DCCPO_CHANGE_R,
-                                                     (struct dccp_so_feat __user *)
-                                                     optval);
-                break;
         case DCCP_SOCKOPT_SERVER_TIMEWAIT:
                 if (dp->dccps_role != DCCP_ROLE_SERVER)
                         err = -EOPNOTSUPP;
                 else
                         dp->dccps_server_timewait = (val != 0);
                 break;
-        case DCCP_SOCKOPT_SEND_CSCOV:   /* sender side, RFC 4340, sec. 9.2 */
-                if (val < 0 || val > 15)
+        case DCCP_SOCKOPT_SEND_CSCOV:
+                err = dccp_setsockopt_cscov(sk, val, false);
+                break;
+        case DCCP_SOCKOPT_RECV_CSCOV:
+                err = dccp_setsockopt_cscov(sk, val, true);
+                break;
+        case DCCP_SOCKOPT_QPOLICY_ID:
+                if (sk->sk_state != DCCP_CLOSED)
+                        err = -EISCONN;
+                else if (val < 0 || val >= DCCPQ_POLICY_MAX)
                         err = -EINVAL;
                 else
-                        dp->dccps_pcslen = val;
+                        dp->dccps_qpolicy = val;
                 break;
-        case DCCP_SOCKOPT_RECV_CSCOV:   /* receiver side, RFC 4340 sec. 9.2.1 */
-                if (val < 0 || val > 15)
+        case DCCP_SOCKOPT_QPOLICY_TXQLEN:
+                if (val < 0)
                         err = -EINVAL;
-                else {
-                        dp->dccps_pcrlen = val;
-                        /* FIXME: add feature negotiation,
-                         * ChangeL(MinimumChecksumCoverage, val) */
-                }
+                else
+                        dp->dccps_tx_qlen = val;
                 break;
         default:
                 err = -ENOPROTOOPT;
                 break;
         }
-
         release_sock(sk);
+
         return err;
 }
 
@@ -648,6 +642,18 @@ static int do_dccp_getsockopt(struct sock *sk, int level, int optname,
         case DCCP_SOCKOPT_GET_CUR_MPS:
                 val = dp->dccps_mss_cache;
                 break;
+        case DCCP_SOCKOPT_AVAILABLE_CCIDS:
+                return ccid_getsockopt_builtin_ccids(sk, len, optval, optlen);
+        case DCCP_SOCKOPT_TX_CCID:
+                val = ccid_get_current_tx_ccid(dp);
+                if (val < 0)
+                        return -ENOPROTOOPT;
+                break;
+        case DCCP_SOCKOPT_RX_CCID:
+                val = ccid_get_current_rx_ccid(dp);
+                if (val < 0)
+                        return -ENOPROTOOPT;
+                break;
         case DCCP_SOCKOPT_SERVER_TIMEWAIT:
                 val = dp->dccps_server_timewait;
                 break;
@@ -657,6 +663,12 @@ static int do_dccp_getsockopt(struct sock *sk, int level, int optname,
         case DCCP_SOCKOPT_RECV_CSCOV:
                 val = dp->dccps_pcrlen;
                 break;
+        case DCCP_SOCKOPT_QPOLICY_ID:
+                val = dp->dccps_qpolicy;
+                break;
+        case DCCP_SOCKOPT_QPOLICY_TXQLEN:
+                val = dp->dccps_tx_qlen;
+                break;
         case 128 ... 191:
                 return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname,
                                              len, (u32 __user *)optval, optlen);
@@ -699,6 +711,47 @@ int compat_dccp_getsockopt(struct sock *sk, int level, int optname,
 EXPORT_SYMBOL_GPL(compat_dccp_getsockopt);
 #endif
 
+static int dccp_msghdr_parse(struct msghdr *msg, struct sk_buff *skb)
+{
+        struct cmsghdr *cmsg = CMSG_FIRSTHDR(msg);
+
+        /*
+         * Assign an (opaque) qpolicy priority value to skb->priority.
+         *
+         * We are overloading this skb field for use with the qpolicy subystem.
+         * The skb->priority is normally used for the SO_PRIORITY option, which
+         * is initialised from sk_priority. Since the assignment of sk_priority
+         * to skb->priority happens later (on layer 3), we overload this field
+         * for use with queueing priorities as long as the skb is on layer 4.
+         * The default priority value (if nothing is set) is 0.
+         */
+        skb->priority = 0;
+
+        for (; cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg)) {
+
+                if (!CMSG_OK(msg, cmsg))
+                        return -EINVAL;
+
+                if (cmsg->cmsg_level != SOL_DCCP)
+                        continue;
+
+                if (cmsg->cmsg_type <= DCCP_SCM_QPOLICY_MAX &&
+                    !dccp_qpolicy_param_ok(skb->sk, cmsg->cmsg_type))
+                        return -EINVAL;
+
+                switch (cmsg->cmsg_type) {
+                case DCCP_SCM_PRIORITY:
+                        if (cmsg->cmsg_len != CMSG_LEN(sizeof(__u32)))
+                                return -EINVAL;
+                        skb->priority = *(__u32 *)CMSG_DATA(cmsg);
+                        break;
+                default:
+                        return -EINVAL;
+                }
+        }
+        return 0;
+}
+
 int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
                  size_t len)
 {
@@ -714,8 +767,7 @@ int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 
         lock_sock(sk);
 
-        if (sysctl_dccp_tx_qlen &&
-            (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) {
+        if (dccp_qpolicy_full(sk)) {
                 rc = -EAGAIN;
                 goto out_release;
         }
@@ -743,8 +795,12 @@ int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
         if (rc != 0)
                 goto out_discard;
 
-        skb_queue_tail(&sk->sk_write_queue, skb);
-        dccp_write_xmit(sk,0);
+        rc = dccp_msghdr_parse(msg, skb);
+        if (rc != 0)
+                goto out_discard;
+
+        dccp_qpolicy_push(sk, skb);
+        dccp_write_xmit(sk);
 out_release:
         release_sock(sk);
         return rc ? : len;
@@ -967,9 +1023,22 @@ void dccp_close(struct sock *sk, long timeout)
                 /* Check zero linger _after_ checking for unread data. */
                 sk->sk_prot->disconnect(sk, 0);
         } else if (sk->sk_state != DCCP_CLOSED) {
+                /*
+                 * Normal connection termination. May need to wait if there are
+                 * still packets in the TX queue that are delayed by the CCID.
+                 */
+                dccp_flush_write_queue(sk, &timeout);
                 dccp_terminate_connection(sk);
         }
 
+        /*
+         * Flush write queue. This may be necessary in several cases:
+         * - we have been closed by the peer but still have application data;
+         * - abortive termination (unread data or zero linger time),
+         * - normal termination but queue could not be flushed within time limit
+         */
+        __skb_queue_purge(&sk->sk_write_queue);
+
         sk_stream_wait_close(sk, timeout);
 
 adjudge_to_death:
diff --git a/net/dccp/qpolicy.c b/net/dccp/qpolicy.c
new file mode 100644
index 000000000000..27383f88c75f
--- /dev/null
+++ b/net/dccp/qpolicy.c
@@ -0,0 +1,137 @@
+/*
+ *  net/dccp/qpolicy.c
+ *
+ *  Policy-based packet dequeueing interface for DCCP.
+ *
+ *  Copyright (c) 2008 Tomasz Grobelny <tomasz@grobelny.oswiecenia.net>
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License v2
+ *  as published by the Free Software Foundation.
+ */
+#include "dccp.h"
+
+/*
+ *      Simple Dequeueing Policy:
+ *      If tx_qlen is different from 0, enqueue up to tx_qlen elements.
+ */
+static void qpolicy_simple_push(struct sock *sk, struct sk_buff *skb)
+{
+        skb_queue_tail(&sk->sk_write_queue, skb);
+}
+
+static bool qpolicy_simple_full(struct sock *sk)
+{
+        return dccp_sk(sk)->dccps_tx_qlen &&
+               sk->sk_write_queue.qlen >= dccp_sk(sk)->dccps_tx_qlen;
+}
+
+static struct sk_buff *qpolicy_simple_top(struct sock *sk)
+{
+        return skb_peek(&sk->sk_write_queue);
+}
+
+/*
+ *      Priority-based Dequeueing Policy:
+ *      If tx_qlen is different from 0 and the queue has reached its upper bound
+ *      of tx_qlen elements, replace older packets lowest-priority-first.
+ */
+static struct sk_buff *qpolicy_prio_best_skb(struct sock *sk)
+{
+        struct sk_buff *skb, *best = NULL;
+
+        skb_queue_walk(&sk->sk_write_queue, skb)
+                if (best == NULL || skb->priority > best->priority)
+                        best = skb;
+        return best;
+}
+
+static struct sk_buff *qpolicy_prio_worst_skb(struct sock *sk)
+{
+        struct sk_buff *skb, *worst = NULL;
+
+        skb_queue_walk(&sk->sk_write_queue, skb)
+                if (worst == NULL || skb->priority < worst->priority)
+                        worst = skb;
+        return worst;
+}
+
+static bool qpolicy_prio_full(struct sock *sk)
+{
+        if (qpolicy_simple_full(sk))
+                dccp_qpolicy_drop(sk, qpolicy_prio_worst_skb(sk));
+        return false;
+}
+
+/**
+ * struct dccp_qpolicy_operations  -  TX Packet Dequeueing Interface
+ * @push: add a new @skb to the write queue
+ * @full: indicates that no more packets will be admitted
+ * @top:  peeks at whatever the queueing policy defines as its `top'
+ */
+static struct dccp_qpolicy_operations {
+        void            (*push) (struct sock *sk, struct sk_buff *skb);
+        bool            (*full) (struct sock *sk);
+        struct sk_buff* (*top)  (struct sock *sk);
+        __be32          params;
+
+} qpol_table[DCCPQ_POLICY_MAX] = {
+        [DCCPQ_POLICY_SIMPLE] = {
+                .push   = qpolicy_simple_push,
+                .full   = qpolicy_simple_full,
+                .top    = qpolicy_simple_top,
+                .params = 0,
+        },
+        [DCCPQ_POLICY_PRIO] = {
+                .push   = qpolicy_simple_push,
+                .full   = qpolicy_prio_full,
+                .top    = qpolicy_prio_best_skb,
+                .params = DCCP_SCM_PRIORITY,
+        },
+};
+
+/*
+ *      Externally visible interface
+ */
+void dccp_qpolicy_push(struct sock *sk, struct sk_buff *skb)
+{
+        qpol_table[dccp_sk(sk)->dccps_qpolicy].push(sk, skb);
+}
+
+bool dccp_qpolicy_full(struct sock *sk)
+{
+        return qpol_table[dccp_sk(sk)->dccps_qpolicy].full(sk);
+}
+
+void dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb)
+{
+        if (skb != NULL) {
+                skb_unlink(skb, &sk->sk_write_queue);
+                kfree_skb(skb);
+        }
+}
+
+struct sk_buff *dccp_qpolicy_top(struct sock *sk)
+{
+        return qpol_table[dccp_sk(sk)->dccps_qpolicy].top(sk);
+}
+
+struct sk_buff *dccp_qpolicy_pop(struct sock *sk)
+{
+        struct sk_buff *skb = dccp_qpolicy_top(sk);
+
+        /* Clear any skb fields that we used internally */
+        skb->priority = 0;
+
+        if (skb)
+                skb_unlink(skb, &sk->sk_write_queue);
+        return skb;
+}
+
+bool dccp_qpolicy_param_ok(struct sock *sk, __be32 param)
+{
+        /* check if exactly one bit is set */
+        if (!param || (param & (param - 1)))
+                return false;
+        return (qpol_table[dccp_sk(sk)->dccps_qpolicy].params & param) == param;
+}
diff --git a/net/dccp/sysctl.c b/net/dccp/sysctl.c
index 21295993fdb8..a5a1856234e7 100644
--- a/net/dccp/sysctl.c
+++ b/net/dccp/sysctl.c
@@ -18,76 +18,72 @@
 #error This file should not be compiled without CONFIG_SYSCTL defined
 #endif
 
+/* Boundary values */
+static int              zero     = 0,
+                        u8_max   = 0xFF;
+static unsigned long    seqw_min = 32;
+
 static struct ctl_table dccp_default_table[] = {
         {
                 .procname       = "seq_window",
-                .data           = &sysctl_dccp_feat_sequence_window,
-                .maxlen         = sizeof(sysctl_dccp_feat_sequence_window),
+                .data           = &sysctl_dccp_sequence_window,
+                .maxlen         = sizeof(sysctl_dccp_sequence_window),
                 .mode           = 0644,
-                .proc_handler   = proc_dointvec,
+                .proc_handler   = proc_doulongvec_minmax,
+                .extra1         = &seqw_min,            /* RFC 4340, 7.5.2 */
         },
         {
                 .procname       = "rx_ccid",
-                .data           = &sysctl_dccp_feat_rx_ccid,
-                .maxlen         = sizeof(sysctl_dccp_feat_rx_ccid),
+                .data           = &sysctl_dccp_rx_ccid,
+                .maxlen         = sizeof(sysctl_dccp_rx_ccid),
                 .mode           = 0644,
-                .proc_handler   = proc_dointvec,
+                .proc_handler   = proc_dointvec_minmax,
+                .extra1         = &zero,
+                .extra2         = &u8_max,              /* RFC 4340, 10. */
         },
         {
                 .procname       = "tx_ccid",
-                .data           = &sysctl_dccp_feat_tx_ccid,
-                .maxlen         = sizeof(sysctl_dccp_feat_tx_ccid),
-                .mode           = 0644,
-                .proc_handler   = proc_dointvec,
-        },
-        {
-                .procname       = "ack_ratio",
-                .data           = &sysctl_dccp_feat_ack_ratio,
-                .maxlen         = sizeof(sysctl_dccp_feat_ack_ratio),
-                .mode           = 0644,
-                .proc_handler   = proc_dointvec,
-        },
-        {
-                .procname       = "send_ackvec",
-                .data           = &sysctl_dccp_feat_send_ack_vector,
-                .maxlen         = sizeof(sysctl_dccp_feat_send_ack_vector),
-                .mode           = 0644,
-                .proc_handler   = proc_dointvec,
-        },
-        {
-                .procname       = "send_ndp",
-                .data           = &sysctl_dccp_feat_send_ndp_count,
-                .maxlen         = sizeof(sysctl_dccp_feat_send_ndp_count),
+                .data           = &sysctl_dccp_tx_ccid,
+                .maxlen         = sizeof(sysctl_dccp_tx_ccid),
                 .mode           = 0644,
-                .proc_handler   = proc_dointvec,
+                .proc_handler   = proc_dointvec_minmax,
+                .extra1         = &zero,
+                .extra2         = &u8_max,              /* RFC 4340, 10. */
         },
         {
                 .procname       = "request_retries",
                 .data           = &sysctl_dccp_request_retries,
                 .maxlen         = sizeof(sysctl_dccp_request_retries),
                 .mode           = 0644,
-                .proc_handler   = proc_dointvec,
+                .proc_handler   = proc_dointvec_minmax,
+                .extra1         = &zero,
+                .extra2         = &u8_max,
         },
         {
                 .procname       = "retries1",
                 .data           = &sysctl_dccp_retries1,
                 .maxlen         = sizeof(sysctl_dccp_retries1),
                 .mode           = 0644,
-                .proc_handler   = proc_dointvec,
+                .proc_handler   = proc_dointvec_minmax,
+                .extra1         = &zero,
+                .extra2         = &u8_max,
         },
         {
                 .procname       = "retries2",
                 .data           = &sysctl_dccp_retries2,
                 .maxlen         = sizeof(sysctl_dccp_retries2),
                 .mode           = 0644,
-                .proc_handler   = proc_dointvec,
+                .proc_handler   = proc_dointvec_minmax,
+                .extra1         = &zero,
+                .extra2         = &u8_max,
         },
         {
                 .procname       = "tx_qlen",
                 .data           = &sysctl_dccp_tx_qlen,
                 .maxlen         = sizeof(sysctl_dccp_tx_qlen),
                 .mode           = 0644,
-                .proc_handler   = proc_dointvec,
+                .proc_handler   = proc_dointvec_minmax,
+                .extra1         = &zero,
         },
         {
                 .procname       = "sync_ratelimit",
diff --git a/net/dccp/timer.c b/net/dccp/timer.c
index 54b3c7e9e016..16359e29e7f5 100644
--- a/net/dccp/timer.c
+++ b/net/dccp/timer.c
@@ -87,17 +87,6 @@ static void dccp_retransmit_timer(struct sock *sk)
 {
         struct inet_connection_sock *icsk = inet_csk(sk);
 
-        /* retransmit timer is used for feature negotiation throughout
-         * connection.  In this case, no packet is re-transmitted, but rather an
-         * ack is generated and pending changes are placed into its options.
-         */
-        if (sk->sk_send_head == NULL) {
-                dccp_pr_debug("feat negotiation retransmit timeout %p\n", sk);
-                if (sk->sk_state == DCCP_OPEN)
-                        dccp_send_ack(sk);
-                goto backoff;
-        }
-
         /*
          * More than than 4MSL (8 minutes) has passed, a RESET(aborted) was
          * sent, no need to retransmit, this sock is dead.
@@ -126,7 +115,6 @@ static void dccp_retransmit_timer(struct sock *sk)
                 return;
         }
 
-backoff:
         icsk->icsk_backoff++;
 
         icsk->icsk_rto = min(icsk->icsk_rto << 1, DCCP_RTO_MAX);
@@ -249,32 +237,35 @@ out:
         sock_put(sk);
 }
 
-/* Transmit-delay timer: used by the CCIDs to delay actual send time */
-static void dccp_write_xmit_timer(unsigned long data)
+/**
+ * dccp_write_xmitlet  -  Workhorse for CCID packet dequeueing interface
+ * See the comments above %ccid_dequeueing_decision for supported modes.
+ */
+static void dccp_write_xmitlet(unsigned long data)
 {
         struct sock *sk = (struct sock *)data;
-        struct dccp_sock *dp = dccp_sk(sk);
 
         bh_lock_sock(sk);
         if (sock_owned_by_user(sk))
-                sk_reset_timer(sk, &dp->dccps_xmit_timer, jiffies+1);
+                sk_reset_timer(sk, &dccp_sk(sk)->dccps_xmit_timer, jiffies + 1);
         else
-                dccp_write_xmit(sk, 0);
+                dccp_write_xmit(sk);
         bh_unlock_sock(sk);
-        sock_put(sk);
 }
 
-static void dccp_init_write_xmit_timer(struct sock *sk)
+static void dccp_write_xmit_timer(unsigned long data)
 {
-        struct dccp_sock *dp = dccp_sk(sk);
-
-        setup_timer(&dp->dccps_xmit_timer, dccp_write_xmit_timer,
-                        (unsigned long)sk);
+        dccp_write_xmitlet(data);
+        sock_put((struct sock *)data);
 }
 
 void dccp_init_xmit_timers(struct sock *sk)
 {
-        dccp_init_write_xmit_timer(sk);
+        struct dccp_sock *dp = dccp_sk(sk);
+
+        tasklet_init(&dp->dccps_xmitlet, dccp_write_xmitlet, (unsigned long)sk);
+        setup_timer(&dp->dccps_xmit_timer, dccp_write_xmit_timer,
+                                                             (unsigned long)sk);
         inet_csk_init_xmit_timers(sk, &dccp_write_timer, &dccp_delack_timer,
                                   &dccp_keepalive_timer);
 }
@@ -290,8 +281,7 @@ u32 dccp_timestamp(void)
 {
         s64 delta = ktime_us_delta(ktime_get_real(), dccp_timestamp_seed);
 
-        do_div(delta, 10);
-        return delta;
+        return div_u64(delta, DCCP_TIME_RESOLUTION);
 }
 EXPORT_SYMBOL_GPL(dccp_timestamp);
 
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index f79a51607292..9da9f19ece8a 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -811,25 +811,12 @@ void tcp_update_metrics(struct sock *sk)
         }
 }
 
-/* Numbers are taken from RFC3390.
- *
- * John Heffner states:
- *
- *      The RFC specifies a window of no more than 4380 bytes
- *      unless 2*MSS > 4380.  Reading the pseudocode in the RFC
- *      is a bit misleading because they use a clamp at 4380 bytes
- *      rather than use a multiplier in the relevant range.
- */
 __u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst)
 {
         __u32 cwnd = (dst ? dst_metric(dst, RTAX_INITCWND) : 0);
 
-        if (!cwnd) {
-                if (tp->mss_cache > 1460)
-                        cwnd = 2;
-                else
-                        cwnd = (tp->mss_cache > 1095) ? 3 : 4;
-        }
+        if (!cwnd)
+                cwnd = rfc3390_bytes_to_packets(tp->mss_cache);
         return min_t(__u32, cwnd, tp->snd_cwnd_clamp);
 }