9 files changed, 172 insertions, 123 deletions

diff --git a/include/linux/dccp.h b/include/linux/dccp.h
index 007c290f74d4..8bf4bacb5051 100644
--- a/include/linux/dccp.h
+++ b/include/linux/dccp.h
@@ -432,7 +432,10 @@ struct dccp_sock {
         struct ccid                     *dccps_hc_rx_ccid;
         struct ccid                     *dccps_hc_tx_ccid;
         struct dccp_options_received    dccps_options_received;
+        struct timeval                  dccps_epoch;
         enum dccp_role                  dccps_role:2;
+        __u8                            dccps_hc_rx_insert_options:1;
+        __u8                            dccps_hc_tx_insert_options:1;
 };
  
 static inline struct dccp_sock *dccp_sk(const struct sock *sk)
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index 7bf3b3a91e97..ea30012dd195 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -43,12 +43,22 @@
 #include "ccid3.h"
 
 /*
- * Reason for maths with 10 here is to avoid 32 bit overflow when a is big.
+ * Reason for maths here is to avoid 32 bit overflow when a is big.
+ * With this we get close to the limit.
  */
 static inline u32 usecs_div(const u32 a, const u32 b)
 {
-        const u32 tmp = a * (USEC_PER_SEC / 10);
-        return b > 20 ? tmp / (b / 10) : tmp;
+        const u32 div = a < (UINT_MAX / (USEC_PER_SEC /    10)) ?    10 :
+                        a < (UINT_MAX / (USEC_PER_SEC /    50)) ?    50 :
+                        a < (UINT_MAX / (USEC_PER_SEC /   100)) ?   100 :
+                        a < (UINT_MAX / (USEC_PER_SEC /   500)) ?   500 :
+                        a < (UINT_MAX / (USEC_PER_SEC /  1000)) ?  1000 :
+                        a < (UINT_MAX / (USEC_PER_SEC /  5000)) ?  5000 :
+                        a < (UINT_MAX / (USEC_PER_SEC / 10000)) ? 10000 :
+                        a < (UINT_MAX / (USEC_PER_SEC / 50000)) ? 50000 :
+                                                                 100000;
+        const u32 tmp = a * (USEC_PER_SEC / div);
+        return (b >= 2 * div) ? tmp / (b / div) : tmp;
 }
 
 static int ccid3_debug;
@@ -102,8 +112,7 @@ static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state)
 static inline void ccid3_hc_tx_set_state(struct sock *sk,
                                          enum ccid3_hc_tx_states state)
 {
-        struct dccp_sock *dp = dccp_sk(sk);
-        struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+        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",
@@ -144,8 +153,7 @@ static inline void ccid3_calc_new_delta(struct ccid3_hc_tx_sock *hctx)
  */ 
 static void ccid3_hc_tx_update_x(struct sock *sk)
 {
-        struct dccp_sock *dp = dccp_sk(sk);
-        struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+        struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
 
         /* To avoid large error in calcX */
         if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) {
@@ -159,7 +167,7 @@ static void ccid3_hc_tx_update_x(struct sock *sk)
         } else {
                 struct timeval now;
 
-                do_gettimeofday(&now);
+                dccp_timestamp(sk, &now);
                 if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >=
                     hctx->ccid3hctx_rtt) {
                         hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv,
@@ -174,9 +182,8 @@ static void ccid3_hc_tx_update_x(struct sock *sk)
 static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
 {
         struct sock *sk = (struct sock *)data;
-        struct dccp_sock *dp = dccp_sk(sk);
         unsigned long next_tmout = 0;
-        struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+        struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
 
         bh_lock_sock(sk);
         if (sock_owned_by_user(sk)) {
@@ -274,7 +281,7 @@ static int ccid3_hc_tx_send_packet(struct sock *sk,
                                    struct sk_buff *skb, int len)
 {
         struct dccp_sock *dp = dccp_sk(sk);
-        struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+        struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
         struct dccp_tx_hist_entry *new_packet;
         struct timeval now;
         long delay;
@@ -307,7 +314,7 @@ static int ccid3_hc_tx_send_packet(struct sock *sk,
                 dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet);
         }
 
-        do_gettimeofday(&now);
+        dccp_timestamp(sk, &now);
 
         switch (hctx->ccid3hctx_state) {
         case TFRC_SSTATE_NO_SENT:
@@ -348,18 +355,20 @@ static int ccid3_hc_tx_send_packet(struct sock *sk,
         }
 
         /* Can we send? if so add options and add to packet history */
-        if (rc == 0)
+        if (rc == 0) {
+                dp->dccps_hc_tx_insert_options = 1;
                 new_packet->dccphtx_ccval =
                         DCCP_SKB_CB(skb)->dccpd_ccval =
                                 hctx->ccid3hctx_last_win_count;
+        }
 out:
         return rc;
 }
 
 static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
 {
-        struct dccp_sock *dp = dccp_sk(sk);
-        struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+        const struct dccp_sock *dp = dccp_sk(sk);
+        struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
         struct timeval now;
 
         BUG_ON(hctx == NULL);
@@ -370,7 +379,7 @@ static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
                 return;
         }
 
-        do_gettimeofday(&now);
+        dccp_timestamp(sk, &now);
 
         /* check if we have sent a data packet */
         if (len > 0) {
@@ -445,10 +454,11 @@ static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
 
 static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
 {
-        struct dccp_sock *dp = dccp_sk(sk);
-        struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+        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;
         struct dccp_tx_hist_entry *packet;
+        struct timeval now;
         unsigned long next_tmout; 
         u32 t_elapsed;
         u32 pinv;
@@ -471,7 +481,7 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
 
         opt_recv = &hctx->ccid3hctx_options_received;
 
-        t_elapsed = dp->dccps_options_received.dccpor_elapsed_time;
+        t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10;
         x_recv = opt_recv->ccid3or_receive_rate;
         pinv = opt_recv->ccid3or_loss_event_rate;
 
@@ -496,9 +506,14 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
                 }
 
                 /* Update RTT */
-                r_sample = timeval_now_delta(&packet->dccphtx_tstamp);
-                /* FIXME: */
-                // r_sample -= usecs_to_jiffies(t_elapsed * 10);
+                dccp_timestamp(sk, &now);
+                r_sample = timeval_delta(&now, &packet->dccphtx_tstamp);
+                if (unlikely(r_sample <= t_elapsed))
+                        LIMIT_NETDEBUG(KERN_WARNING
+                                       "%s: r_sample=%uus, t_elapsed=%uus\n",
+                                       __FUNCTION__, r_sample, t_elapsed);
+                else
+                        r_sample -= t_elapsed;
 
                 /* Update RTT estimate by 
                  * If (No feedback recv)
@@ -591,8 +606,7 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
 
 static void ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb)
 {
-        const struct dccp_sock *dp = dccp_sk(sk);
-        struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+        struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
 
         if (hctx == NULL || !(sk->sk_state == DCCP_OPEN ||
                               sk->sk_state == DCCP_PARTOPEN))
@@ -606,8 +620,8 @@ static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option,
                                      unsigned char *value)
 {
         int rc = 0;
-        struct dccp_sock *dp = dccp_sk(sk);
-        struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+        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;
 
         if (hctx == NULL)
@@ -670,11 +684,11 @@ static int ccid3_hc_tx_init(struct sock *sk)
 
         ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
 
-        hctx = dp->dccps_hc_tx_ccid_private = kmalloc(sizeof(*hctx),
-                                                      gfp_any());
-        if (hctx == NULL)
+        dp->dccps_hc_tx_ccid_private = kmalloc(sizeof(*hctx), gfp_any());
+        if (dp->dccps_hc_tx_ccid_private == NULL)
                 return -ENOMEM;
 
+        hctx = ccid3_hc_tx_sk(sk);
         memset(hctx, 0, sizeof(*hctx));
 
         if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE &&
@@ -696,7 +710,7 @@ static int ccid3_hc_tx_init(struct sock *sk)
 static void ccid3_hc_tx_exit(struct sock *sk)
 {
         struct dccp_sock *dp = dccp_sk(sk);
-        struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+        struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
 
         ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
         BUG_ON(hctx == NULL);
@@ -738,8 +752,7 @@ static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state)
 static inline void ccid3_hc_rx_set_state(struct sock *sk,
                                          enum ccid3_hc_rx_states state)
 {
-        struct dccp_sock *dp = dccp_sk(sk);
-        struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
+        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",
@@ -751,14 +764,14 @@ static inline void ccid3_hc_rx_set_state(struct sock *sk,
 
 static void ccid3_hc_rx_send_feedback(struct sock *sk)
 {
+        struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
         struct dccp_sock *dp = dccp_sk(sk);
-        struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
         struct dccp_rx_hist_entry *packet;
         struct timeval now;
 
         ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
 
-        do_gettimeofday(&now);
+        dccp_timestamp(sk, &now);
 
         switch (hcrx->ccid3hcrx_state) {
         case TFRC_RSTATE_NO_DATA:
@@ -767,11 +780,8 @@ static void ccid3_hc_rx_send_feedback(struct sock *sk)
         case TFRC_RSTATE_DATA: {
                 const u32 delta = timeval_delta(&now,
                                         &hcrx->ccid3hcrx_tstamp_last_feedback);
-
-                hcrx->ccid3hcrx_x_recv = (hcrx->ccid3hcrx_bytes_recv *
-                                          USEC_PER_SEC);
-                if (likely(delta > 1))
-                        hcrx->ccid3hcrx_x_recv /= delta;
+                hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv,
+                                                   delta);
         }
                 break;
         default:
@@ -801,14 +811,14 @@ static void ccid3_hc_rx_send_feedback(struct sock *sk)
                 hcrx->ccid3hcrx_pinv = ~0;
         else
                 hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p;
+        dp->dccps_hc_rx_insert_options = 1;
         dccp_send_ack(sk);
 }
 
 static void ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb)
 {
-        const struct dccp_sock *dp = dccp_sk(sk);
+        struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
         u32 x_recv, pinv;
-        struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
 
         if (hcrx == NULL || !(sk->sk_state == DCCP_OPEN ||
                               sk->sk_state == DCCP_PARTOPEN))
@@ -837,8 +847,7 @@ static void ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb)
 
 static u32 ccid3_hc_rx_calc_first_li(struct sock *sk)
 {
-        struct dccp_sock *dp = dccp_sk(sk);
-        struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
+        struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
         struct dccp_rx_hist_entry *entry, *next, *tail = NULL;
         u32 rtt, delta, x_recv, fval, p, tmp2;
         struct timeval tstamp = { 0, };
@@ -889,10 +898,9 @@ found:
         if (rtt == 0)
                 rtt = 1;
 
-        delta = timeval_now_delta(&hcrx->ccid3hcrx_tstamp_last_feedback);
-        x_recv = hcrx->ccid3hcrx_bytes_recv * USEC_PER_SEC;
-        if (likely(delta > 1))
-                x_recv /= delta;
+        dccp_timestamp(sk, &tstamp);
+        delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback);
+        x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta);
 
         tmp1 = (u64)x_recv * (u64)rtt;
         do_div(tmp1,10000000);
@@ -911,8 +919,7 @@ found:
 
 static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss)
 {
-        struct dccp_sock *dp = dccp_sk(sk);
-        struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
+        struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
 
         if (seq_loss != DCCP_MAX_SEQNO + 1 &&
             list_empty(&hcrx->ccid3hcrx_li_hist)) {
@@ -930,8 +937,7 @@ static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss)
 
 static void ccid3_hc_rx_detect_loss(struct sock *sk)
 {
-        struct dccp_sock *dp = dccp_sk(sk);
-        struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
+        struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
         u8 win_loss;
         const u64 seq_loss = dccp_rx_hist_detect_loss(&hcrx->ccid3hcrx_hist,
                                                       &hcrx->ccid3hcrx_li_hist,
@@ -942,13 +948,12 @@ static void ccid3_hc_rx_detect_loss(struct sock *sk)
 
 static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
 {
-        struct dccp_sock *dp = dccp_sk(sk);
-        struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
+        struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
         const struct dccp_options_received *opt_recv;
         struct dccp_rx_hist_entry *packet;
         struct timeval now;
         u8 win_count;
-        u32 p_prev;
+        u32 p_prev, r_sample, t_elapsed;
         int ins;
 
         if (hcrx == NULL)
@@ -957,7 +962,7 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
         BUG_ON(!(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA ||
                  hcrx->ccid3hcrx_state == TFRC_RSTATE_DATA));
 
-        opt_recv = &dp->dccps_options_received;
+        opt_recv = &dccp_sk(sk)->dccps_options_received;
 
         switch (DCCP_SKB_CB(skb)->dccpd_type) {
         case DCCP_PKT_ACK:
@@ -967,10 +972,24 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
                 if (opt_recv->dccpor_timestamp_echo == 0)
                         break;
                 p_prev = hcrx->ccid3hcrx_rtt;
-                do_gettimeofday(&now);
-                hcrx->ccid3hcrx_rtt = timeval_usecs(&now) -
-                                     (opt_recv->dccpor_timestamp_echo -
-                                      opt_recv->dccpor_elapsed_time) * 10;
+                dccp_timestamp(sk, &now);
+                timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10);
+                r_sample = timeval_usecs(&now);
+                t_elapsed = opt_recv->dccpor_elapsed_time * 10;
+
+                if (unlikely(r_sample <= t_elapsed))
+                        LIMIT_NETDEBUG(KERN_WARNING
+                                       "%s: r_sample=%uus, t_elapsed=%uus\n",
+                                       __FUNCTION__, r_sample, t_elapsed);
+                else
+                        r_sample -= t_elapsed;
+
+                if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)
+                        hcrx->ccid3hcrx_rtt = r_sample;
+                else
+                        hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 +
+                                              r_sample / 10;
+
                 if (p_prev != hcrx->ccid3hcrx_rtt)
                         ccid3_pr_debug("%s, New RTT=%luus, elapsed time=%u\n",
                                        dccp_role(sk), hcrx->ccid3hcrx_rtt,
@@ -985,7 +1004,7 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
                 return;
         }
 
-        packet = dccp_rx_hist_entry_new(ccid3_rx_hist, opt_recv->dccpor_ndp,
+        packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp,
                                         skb, SLAB_ATOMIC);
         if (packet == NULL) {
                 ccid3_pr_debug("%s, sk=%p, Not enough mem to add rx packet "
@@ -1017,7 +1036,7 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
                 if (ins != 0)
                         break;
 
-                do_gettimeofday(&now);
+                dccp_timestamp(sk, &now);
                 if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >=
                     hcrx->ccid3hcrx_rtt) {
                         hcrx->ccid3hcrx_tstamp_last_ack = now;
@@ -1056,11 +1075,11 @@ static int ccid3_hc_rx_init(struct sock *sk)
 
         ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
 
-        hcrx = dp->dccps_hc_rx_ccid_private = kmalloc(sizeof(*hcrx),
-                                                      gfp_any());
-        if (hcrx == NULL)
+        dp->dccps_hc_rx_ccid_private = kmalloc(sizeof(*hcrx), gfp_any());
+        if (dp->dccps_hc_rx_ccid_private == NULL)
                 return -ENOMEM;
 
+        hcrx = ccid3_hc_rx_sk(sk);
         memset(hcrx, 0, sizeof(*hcrx));
 
         if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE &&
@@ -1072,18 +1091,16 @@ static int ccid3_hc_rx_init(struct sock *sk)
         hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA;
         INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist);
         INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist);
-        /*
-         * XXX this seems to be paranoid, need to think more about this, for
-         * now start with something different than zero. -acme
-         */
-        hcrx->ccid3hcrx_rtt = USEC_PER_SEC / 5;
+        dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack);
+        hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack;
+        hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */
         return 0;
 }
 
 static void ccid3_hc_rx_exit(struct sock *sk)
 {
+        struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
         struct dccp_sock *dp = dccp_sk(sk);
-        struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
 
         ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
 
@@ -1104,8 +1121,7 @@ static void ccid3_hc_rx_exit(struct sock *sk)
 
 static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info)
 {
-        const struct dccp_sock *dp = dccp_sk(sk);
-        const struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
+        const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
 
         if (hcrx == NULL)
                 return;
@@ -1117,8 +1133,7 @@ static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info)
 
 static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info)
 {
-        const struct dccp_sock *dp = dccp_sk(sk);
-        const struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+        const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
 
         if (hctx == NULL)
                 return;
diff --git a/net/dccp/ccids/ccid3.h b/net/dccp/ccids/ccid3.h
index ee8cbace6630..d16f00d784f3 100644
--- a/net/dccp/ccids/ccid3.h
+++ b/net/dccp/ccids/ccid3.h
@@ -115,7 +115,7 @@ struct ccid3_hc_rx_sock {
         u64                     ccid3hcrx_seqno_last_counter:48,
                                 ccid3hcrx_state:8,
                                 ccid3hcrx_last_counter:4;
-        unsigned long           ccid3hcrx_rtt;
+        u32                     ccid3hcrx_rtt;
         u32                     ccid3hcrx_p;
         u32                     ccid3hcrx_bytes_recv;
         struct timeval          ccid3hcrx_tstamp_last_feedback;
@@ -128,10 +128,14 @@ struct ccid3_hc_rx_sock {
         u32                     ccid3hcrx_x_recv;
 };
 
-#define ccid3_hc_tx_field(s,field) (s->dccps_hc_tx_ccid_private == NULL ? 0 : \
-    ((struct ccid3_hc_tx_sock *)s->dccps_hc_tx_ccid_private)->ccid3hctx_##field)
+static inline struct ccid3_hc_tx_sock *ccid3_hc_tx_sk(const struct sock *sk)
+{
+    return dccp_sk(sk)->dccps_hc_tx_ccid_private;
+}
 
-#define ccid3_hc_rx_field(s,field) (s->dccps_hc_rx_ccid_private == NULL ? 0 : \
-    ((struct ccid3_hc_rx_sock *)s->dccps_hc_rx_ccid_private)->ccid3hcrx_##field)
+static inline struct ccid3_hc_rx_sock *ccid3_hc_rx_sk(const struct sock *sk)
+{
+    return dccp_sk(sk)->dccps_hc_rx_ccid_private;
+}
 
 #endif /* _DCCP_CCID3_H_ */
diff --git a/net/dccp/ccids/lib/packet_history.h b/net/dccp/ccids/lib/packet_history.h
index fb90a91aa93d..b375ebdb7dcf 100644
--- a/net/dccp/ccids/lib/packet_history.h
+++ b/net/dccp/ccids/lib/packet_history.h
@@ -134,6 +134,7 @@ static inline struct dccp_tx_hist_entry *
 
 static inline struct dccp_rx_hist_entry *
                      dccp_rx_hist_entry_new(struct dccp_rx_hist *hist,
+                                            const struct sock *sk, 
                                             const u32 ndp, 
                                             const struct sk_buff *skb,
                                             const unsigned int __nocast prio)
@@ -148,7 +149,7 @@ static inline struct dccp_rx_hist_entry *
                 entry->dccphrx_ccval = dh->dccph_ccval;
                 entry->dccphrx_type  = dh->dccph_type;
                 entry->dccphrx_ndp   = ndp;
-                do_gettimeofday(&(entry->dccphrx_tstamp));
+                dccp_timestamp(sk, &entry->dccphrx_tstamp);
         }
 
         return entry;
diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index 33456c0d5937..95c4630b3b18 100644
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -426,10 +426,13 @@ extern struct dccp_ackpkts *
                 dccp_ackpkts_alloc(unsigned int len,
                                   const unsigned int __nocast priority);
 extern void dccp_ackpkts_free(struct dccp_ackpkts *ap);
-extern int dccp_ackpkts_add(struct dccp_ackpkts *ap, u64 ackno, u8 state);
+extern int dccp_ackpkts_add(struct dccp_ackpkts *ap, const struct sock *sk,
+                            u64 ackno, u8 state);
 extern void dccp_ackpkts_check_rcv_ackno(struct dccp_ackpkts *ap,
                                          struct sock *sk, u64 ackno);
 
+extern void dccp_timestamp(const struct sock *sk, struct timeval *tv);
+
 static inline suseconds_t timeval_usecs(const struct timeval *tv)
 {
         return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
@@ -468,17 +471,6 @@ static inline void timeval_sub_usecs(struct timeval *tv,
         }
 }
 
-/*
- * Returns the difference in usecs between timeval
- * passed in and current time
- */
-static inline suseconds_t timeval_now_delta(const struct timeval *tv)
-{
-        struct timeval now;
-        do_gettimeofday(&now);
-        return timeval_delta(&now, tv);
-}
-
 #ifdef CONFIG_IP_DCCP_DEBUG
 extern void dccp_ackvector_print(const u64 ackno,
                                  const unsigned char *vector, int len);
diff --git a/net/dccp/input.c b/net/dccp/input.c
index ef29cef1dafe..c60bc3433f5e 100644
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -170,7 +170,7 @@ int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
         if (dp->dccps_options.dccpo_send_ack_vector) {
                 struct dccp_ackpkts *ap = dp->dccps_hc_rx_ackpkts;
 
-                if (dccp_ackpkts_add(dp->dccps_hc_rx_ackpkts,
+                if (dccp_ackpkts_add(dp->dccps_hc_rx_ackpkts, sk,
                                      DCCP_SKB_CB(skb)->dccpd_seq,
                                      DCCP_ACKPKTS_STATE_RECEIVED)) {
                         LIMIT_NETDEBUG(KERN_WARNING "DCCP: acknowledgeable "
@@ -498,7 +498,7 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
                  * DCCP_ACKPKTS_STATE_ECN_MARKED
                  */
                 if (dp->dccps_options.dccpo_send_ack_vector) {
-                        if (dccp_ackpkts_add(dp->dccps_hc_rx_ackpkts,
+                        if (dccp_ackpkts_add(dp->dccps_hc_rx_ackpkts, sk,
                                              DCCP_SKB_CB(skb)->dccpd_seq,
                                              DCCP_ACKPKTS_STATE_RECEIVED))
                                 goto discard;
diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index 3fc75dbee4b8..fee9a8c3777b 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -1243,6 +1243,7 @@ static int dccp_v4_init_sock(struct sock *sk)
         static int dccp_ctl_socket_init = 1;
 
         dccp_options_init(&dp->dccps_options);
+        do_gettimeofday(&dp->dccps_epoch);
 
         if (dp->dccps_options.dccpo_send_ack_vector) {
                 dp->dccps_hc_rx_ackpkts =
diff --git a/net/dccp/minisocks.c b/net/dccp/minisocks.c
index ce5dff4ac22e..18461bc04cbe 100644
--- a/net/dccp/minisocks.c
+++ b/net/dccp/minisocks.c
@@ -96,6 +96,7 @@ struct sock *dccp_create_openreq_child(struct sock *sk,
                 newdp->dccps_hc_rx_ackpkts = NULL;
                 newdp->dccps_role = DCCP_ROLE_SERVER;
                 newicsk->icsk_rto = DCCP_TIMEOUT_INIT;
+                do_gettimeofday(&newdp->dccps_epoch);
 
                 if (newdp->dccps_options.dccpo_send_ack_vector) {
                         newdp->dccps_hc_rx_ackpkts =
diff --git a/net/dccp/options.c b/net/dccp/options.c
index 382c5894acb2..d4c4242d8dd7 100644
--- a/net/dccp/options.c
+++ b/net/dccp/options.c
@@ -72,6 +72,7 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
         struct dccp_options_received *opt_recv = &dp->dccps_options_received;
         unsigned char opt, len;
         unsigned char *value;
+        u32 elapsed_time;
 
         memset(opt_recv, 0, sizeof(*opt_recv));
 
@@ -139,7 +140,7 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
                         opt_recv->dccpor_timestamp = ntohl(*(u32 *)value);
 
                         dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp;
-                        do_gettimeofday(&dp->dccps_timestamp_time);
+                        dccp_timestamp(sk, &dp->dccps_timestamp_time);
 
                         dccp_pr_debug("%sTIMESTAMP=%u, ackno=%llu\n",
                                       debug_prefix, opt_recv->dccpor_timestamp,
@@ -159,18 +160,18 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
                                       (unsigned long long)
                                       DCCP_SKB_CB(skb)->dccpd_ack_seq);
 
-                        if (len > 4) {
-                                if (len == 6)
-                                        opt_recv->dccpor_elapsed_time =
-                                                 ntohs(*(u16 *)(value + 4));
-                                else
-                                        opt_recv->dccpor_elapsed_time =
-                                                 ntohl(*(u32 *)(value + 4));
 
-                                dccp_pr_debug("%sTIMESTAMP_ECHO ELAPSED_TIME=%d\n",
-                                      debug_prefix,
-                                      opt_recv->dccpor_elapsed_time);
-                        }
+                        if (len == 4)
+                                break;
+
+                        if (len == 6)
+                                elapsed_time = ntohs(*(u16 *)(value + 4));
+                        else
+                                elapsed_time = ntohl(*(u32 *)(value + 4));
+
+                        /* Give precedence to the biggest ELAPSED_TIME */
+                        if (elapsed_time > opt_recv->dccpor_elapsed_time)
+                                opt_recv->dccpor_elapsed_time = elapsed_time;
                         break;
                 case DCCPO_ELAPSED_TIME:
                         if (len != 2 && len != 4)
@@ -180,14 +181,15 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
                                 continue;
 
                         if (len == 2)
-                                opt_recv->dccpor_elapsed_time =
-                                                        ntohs(*(u16 *)value);
+                                elapsed_time = ntohs(*(u16 *)value);
                         else
-                                opt_recv->dccpor_elapsed_time =
-                                                        ntohl(*(u32 *)value);
+                                elapsed_time = ntohl(*(u32 *)value);
+
+                        if (elapsed_time > opt_recv->dccpor_elapsed_time)
+                                opt_recv->dccpor_elapsed_time = elapsed_time;
 
                         dccp_pr_debug("%sELAPSED_TIME=%d\n", debug_prefix,
-                                      opt_recv->dccpor_elapsed_time);
+                                      elapsed_time);
                         break;
                         /*
                          * From draft-ietf-dccp-spec-11.txt:
@@ -359,9 +361,13 @@ static void dccp_insert_option_ack_vector(struct sock *sk, struct sk_buff *skb)
 #endif
         struct dccp_ackpkts *ap = dp->dccps_hc_rx_ackpkts;
         int len = ap->dccpap_buf_vector_len + 2;
-        const u32 elapsed_time = timeval_now_delta(&ap->dccpap_time) / 10;
+        struct timeval now;
+        u32 elapsed_time;
         unsigned char *to, *from;
 
+        dccp_timestamp(sk, &now);
+        elapsed_time = timeval_delta(&now, &ap->dccpap_time) / 10;
+
         if (elapsed_time != 0)
                 dccp_insert_option_elapsed_time(sk, skb, elapsed_time);
 
@@ -426,13 +432,29 @@ static void dccp_insert_option_ack_vector(struct sock *sk, struct sk_buff *skb)
                       (unsigned long long) ap->dccpap_ack_ackno);
 }
 
+void dccp_timestamp(const struct sock *sk, struct timeval *tv)
+{
+        const struct dccp_sock *dp = dccp_sk(sk);
+
+        do_gettimeofday(tv);
+        tv->tv_sec  -= dp->dccps_epoch.tv_sec;
+        tv->tv_usec -= dp->dccps_epoch.tv_usec;
+
+        while (tv->tv_usec < 0) {
+                tv->tv_sec--;
+                tv->tv_usec += USEC_PER_SEC;
+        }
+}
+
+EXPORT_SYMBOL_GPL(dccp_timestamp);
+
 void dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb)
 {
         struct timeval tv;
         u32 now;
         
-        do_gettimeofday(&tv);
-        now = (tv.tv_sec * USEC_PER_SEC + tv.tv_usec) / 10;
+        dccp_timestamp(sk, &tv);
+        now = timeval_usecs(&tv) / 10;
         /* yes this will overflow but that is the point as we want a
          * 10 usec 32 bit timer which mean it wraps every 11.9 hours */
 
@@ -450,13 +472,17 @@ static void dccp_insert_option_timestamp_echo(struct sock *sk,
         const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?
                                         "CLIENT TX opt: " : "server TX opt: ";
 #endif
+        struct timeval now;
         u32 tstamp_echo;
-        const u32 elapsed_time =
-                        timeval_now_delta(&dp->dccps_timestamp_time) / 10;
-        const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
-        const int len = 6 + elapsed_time_len;
+        u32 elapsed_time;
+        int len, elapsed_time_len;
         unsigned char *to;
 
+        dccp_timestamp(sk, &now);
+        elapsed_time = timeval_delta(&now, &dp->dccps_timestamp_time) / 10;
+        elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
+        len = 6 + elapsed_time_len;
+
         if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) {
                 LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to insert "
                                          "timestamp echo!\n");
@@ -505,13 +531,18 @@ void dccp_insert_options(struct sock *sk, struct sk_buff *skb)
                     (dp->dccps_hc_rx_ackpkts->dccpap_buf_ackno !=
                      DCCP_MAX_SEQNO + 1))
                         dccp_insert_option_ack_vector(sk, skb);
-
                 if (dp->dccps_timestamp_echo != 0)
                         dccp_insert_option_timestamp_echo(sk, skb);
         }
 
-        ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb);
-        ccid_hc_tx_insert_options(dp->dccps_hc_tx_ccid, sk, skb);
+        if (dp->dccps_hc_rx_insert_options) {
+                ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb);
+                dp->dccps_hc_rx_insert_options = 0;
+        }
+        if (dp->dccps_hc_tx_insert_options) {
+                ccid_hc_tx_insert_options(dp->dccps_hc_tx_ccid, sk, skb);
+                dp->dccps_hc_tx_insert_options = 0;
+        }
 
         /* XXX: insert other options when appropriate */
 
@@ -616,7 +647,8 @@ static inline int dccp_ackpkts_set_buf_head_state(struct dccp_ackpkts *ap,
 /*
  * Implements the draft-ietf-dccp-spec-11.txt Appendix A
  */
-int dccp_ackpkts_add(struct dccp_ackpkts *ap, u64 ackno, u8 state)
+int dccp_ackpkts_add(struct dccp_ackpkts *ap, const struct sock *sk,
+                     u64 ackno, u8 state)
 {
         /*
          * Check at the right places if the buffer is full, if it is, tell the
@@ -697,7 +729,7 @@ int dccp_ackpkts_add(struct dccp_ackpkts *ap, u64 ackno, u8 state)
         }
 
         ap->dccpap_buf_ackno = ackno;
-        do_gettimeofday(&ap->dccpap_time);
+        dccp_timestamp(sk, &ap->dccpap_time);
 out:
         dccp_pr_debug("");
         dccp_ackpkts_print(ap);