[NET]: Supporting UDP-Lite (RFC 3828) in Linux

This is a revision of the previously submitted patch, which alters
the way files are organized and compiled in the following manner:

	* UDP and UDP-Lite now use separate object files
	* source file dependencies resolved via header files
	  net/ipv{4,6}/udp_impl.h
	* order of inclusion files in udp.c/udplite.c adapted
	  accordingly

[NET/IPv4]: Support for the UDP-Lite protocol (RFC 3828)

This patch adds support for UDP-Lite to the IPv4 stack, provided as an
extension to the existing UDPv4 code:
        * generic routines are all located in net/ipv4/udp.c
        * UDP-Lite specific routines are in net/ipv4/udplite.c
        * MIB/statistics support in /proc/net/snmp and /proc/net/udplite
        * shared API with extensions for partial checksum coverage

[NET/IPv6]: Extension for UDP-Lite over IPv6

It extends the existing UDPv6 code base with support for UDP-Lite
in the same manner as per UDPv4. In particular,
        * UDPv6 generic and shared code is in net/ipv6/udp.c
        * UDP-Litev6 specific extensions are in net/ipv6/udplite.c
        * MIB/statistics support in /proc/net/snmp6 and /proc/net/udplite6
        * support for IPV6_ADDRFORM
        * aligned the coding style of protocol initialisation with af_inet6.c
        * made the error handling in udpv6_queue_rcv_skb consistent;
          to return `-1' on error on all error cases
        * consolidation of shared code

[NET]: UDP-Lite Documentation and basic XFRM/Netfilter support

The UDP-Lite patch further provides
        * API documentation for UDP-Lite
        * basic xfrm support
        * basic netfilter support for IPv4 and IPv6 (LOG target)

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 199 insertions, 162 deletions

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 886300d13a59..5a64027bf2fc 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -38,26 +38,18 @@
 #include <linux/skbuff.h>
 #include <asm/uaccess.h>
 
-#include <net/sock.h>
-#include <net/snmp.h>
-
-#include <net/ipv6.h>
 #include <net/ndisc.h>
 #include <net/protocol.h>
 #include <net/transp_v6.h>
 #include <net/ip6_route.h>
-#include <net/addrconf.h>
-#include <net/ip.h>
-#include <net/udp.h>
 #include <net/raw.h>
-#include <net/inet_common.h>
 #include <net/tcp_states.h>
-
 #include <net/ip6_checksum.h>
 #include <net/xfrm.h>
 
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
+#include "udp_impl.h"
 
 DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;
 
@@ -66,23 +58,9 @@ static inline int udp_v6_get_port(struct sock *sk, unsigned short snum)
         return udp_get_port(sk, snum, ipv6_rcv_saddr_equal);
 }
 
-static void udp_v6_hash(struct sock *sk)
-{
-        BUG();
-}
-
-static void udp_v6_unhash(struct sock *sk)
-{
-        write_lock_bh(&udp_hash_lock);
-        if (sk_del_node_init(sk)) {
-                inet_sk(sk)->num = 0;
-                sock_prot_dec_use(sk->sk_prot);
-        }
-        write_unlock_bh(&udp_hash_lock);
-}
-
-static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport,
-                                  struct in6_addr *daddr, u16 dport, int dif)
+static struct sock *__udp6_lib_lookup(struct in6_addr *saddr, __be16 sport,
+                                      struct in6_addr *daddr, __be16 dport,
+                                      int dif, struct hlist_head udptable[])
 {
         struct sock *sk, *result = NULL;
         struct hlist_node *node;
@@ -90,7 +68,7 @@ static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport,
         int badness = -1;
 
         read_lock(&udp_hash_lock);
-        sk_for_each(sk, node, &udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]) {
+        sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
                 struct inet_sock *inet = inet_sk(sk);
 
                 if (inet->num == hnum && sk->sk_family == PF_INET6) {
@@ -132,20 +110,11 @@ static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport,
 }
 
 /*
- *
- */
-
-static void udpv6_close(struct sock *sk, long timeout)
-{
-        sk_common_release(sk);
-}
-
-/*
  *      This should be easy, if there is something there we
  *      return it, otherwise we block.
  */
 
-static int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 
+int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
                   struct msghdr *msg, size_t len,
                   int noblock, int flags, int *addr_len)
 {
@@ -153,7 +122,7 @@ static int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
         struct inet_sock *inet = inet_sk(sk);
         struct sk_buff *skb;
         size_t copied;
-        int err;
+        int err, copy_only, is_udplite = IS_UDPLITE(sk);
 
         if (addr_len)
                 *addr_len=sizeof(struct sockaddr_in6);
@@ -172,15 +141,21 @@ try_again:
                 msg->msg_flags |= MSG_TRUNC;
         }
 
-        if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
-                err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
-                                              copied);
-        } else if (msg->msg_flags&MSG_TRUNC) {
-                if (__skb_checksum_complete(skb))
+        /*
+         *      Decide whether to checksum and/or copy data.
+         */
+        copy_only = (skb->ip_summed==CHECKSUM_UNNECESSARY);
+
+        if (is_udplite  ||  (!copy_only  &&  msg->msg_flags&MSG_TRUNC)) {
+                if (__udp_lib_checksum_complete(skb))
                         goto csum_copy_err;
-                err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
-                                              copied);
-        } else {
+                copy_only = 1;
+        }
+
+        if (copy_only)
+                err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
+                                              msg->msg_iov, copied       );
+        else {
                 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
                 if (err == -EINVAL)
                         goto csum_copy_err;
@@ -231,14 +206,15 @@ csum_copy_err:
         skb_kill_datagram(sk, skb, flags);
 
         if (flags & MSG_DONTWAIT) {
-                UDP6_INC_STATS_USER(UDP_MIB_INERRORS);
+                UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
                 return -EAGAIN;
         }
         goto try_again;
 }
 
-static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
-               int type, int code, int offset, __be32 info)
+void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+                    int type, int code, int offset, __be32 info,
+                    struct hlist_head udptable[]                    )
 {
         struct ipv6_pinfo *np;
         struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
@@ -248,8 +224,8 @@ static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
         struct sock *sk;
         int err;
 
-        sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, inet6_iif(skb));
-   
+        sk = __udp6_lib_lookup(daddr, uh->dest,
+                               saddr, uh->source, inet6_iif(skb), udptable);
         if (sk == NULL)
                 return;
 
@@ -270,31 +246,55 @@ out:
         sock_put(sk);
 }
 
-static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
+static __inline__ void udpv6_err(struct sk_buff *skb,
+                                 struct inet6_skb_parm *opt, int type,
+                                 int code, int offset, __u32 info     )
+{
+        return __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash);
+}
+
+int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
 {
+        struct udp_sock *up = udp_sk(sk);
         int rc;
 
-        if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
-                kfree_skb(skb);
-                return -1;
-        }
+        if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
+                goto drop;
 
-        if (skb_checksum_complete(skb)) {
-                UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
-                kfree_skb(skb);
-                return 0;
+        /*
+         * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
+         */
+        if ((up->pcflag & UDPLITE_RECV_CC)  &&  UDP_SKB_CB(skb)->partial_cov) {
+
+                if (up->pcrlen == 0) {          /* full coverage was set  */
+                        LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
+                                " %d while full coverage %d requested\n",
+                                UDP_SKB_CB(skb)->cscov, skb->len);
+                        goto drop;
+                }
+                if (UDP_SKB_CB(skb)->cscov  <  up->pcrlen) {
+                        LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
+                                                    "too small, need min %d\n",
+                                       UDP_SKB_CB(skb)->cscov, up->pcrlen);
+                        goto drop;
+                }
         }
 
+        if (udp_lib_checksum_complete(skb))
+                goto drop;
+
         if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
                 /* Note that an ENOMEM error is charged twice */
                 if (rc == -ENOMEM)
-                        UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS);
-                UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
-                kfree_skb(skb);
-                return 0;
+                        UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag);
+                goto drop;
         }
-        UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS);
+        UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
         return 0;
+drop:
+        UDP6_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag);
+        kfree_skb(skb);
+        return -1;
 }
 
 static struct sock *udp_v6_mcast_next(struct sock *sk,
@@ -338,15 +338,15 @@ static struct sock *udp_v6_mcast_next(struct sock *sk,
  * Note: called only from the BH handler context,
  * so we don't need to lock the hashes.
  */
-static void udpv6_mcast_deliver(struct udphdr *uh,
-                                struct in6_addr *saddr, struct in6_addr *daddr,
-                                struct sk_buff *skb)
+static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr,
+                           struct in6_addr *daddr, struct hlist_head udptable[])
 {
         struct sock *sk, *sk2;
+        const struct udphdr *uh = skb->h.uh;
         int dif;
 
         read_lock(&udp_hash_lock);
-        sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
+        sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
         dif = inet6_iif(skb);
         sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
         if (!sk) {
@@ -364,9 +364,34 @@ static void udpv6_mcast_deliver(struct udphdr *uh,
         udpv6_queue_rcv_skb(sk, skb);
 out:
         read_unlock(&udp_hash_lock);
+        return 0;
 }
 
-static int udpv6_rcv(struct sk_buff **pskb)
+static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh)
+
+{
+        if (uh->check == 0) {
+                /* RFC 2460 section 8.1 says that we SHOULD log
+                   this error. Well, it is reasonable.
+                 */
+                LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
+                return 1;
+        }
+        if (skb->ip_summed == CHECKSUM_COMPLETE &&
+            !csum_ipv6_magic(&skb->nh.ipv6h->saddr, &skb->nh.ipv6h->daddr,
+                             skb->len, IPPROTO_UDP, skb->csum             ))
+                skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+        if (skb->ip_summed != CHECKSUM_UNNECESSARY)
+                skb->csum = ~csum_ipv6_magic(&skb->nh.ipv6h->saddr,
+                                             &skb->nh.ipv6h->daddr,
+                                             skb->len, IPPROTO_UDP, 0);
+
+        return (UDP_SKB_CB(skb)->partial_cov = 0);
+}
+
+int __udp6_lib_rcv(struct sk_buff **pskb, struct hlist_head udptable[],
+                   int is_udplite)
 {
         struct sk_buff *skb = *pskb;
         struct sock *sk;
@@ -383,44 +408,39 @@ static int udpv6_rcv(struct sk_buff **pskb)
         uh = skb->h.uh;
 
         ulen = ntohs(uh->len);
+        if (ulen > skb->len)
+                goto short_packet;
 
-        /* Check for jumbo payload */
-        if (ulen == 0)
-                ulen = skb->len;
+        if(! is_udplite ) {             /* UDP validates ulen. */
 
-        if (ulen > skb->len || ulen < sizeof(*uh))
-                goto short_packet;
+                /* Check for jumbo payload */
+                if (ulen == 0)
+                        ulen = skb->len;
 
-        if (uh->check == 0) {
-                /* RFC 2460 section 8.1 says that we SHOULD log
-                   this error. Well, it is reasonable.
-                 */
-                LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
-                goto discard;
-        }
+                if (ulen < sizeof(*uh))
+                        goto short_packet;
 
-        if (ulen < skb->len) {
-                if (pskb_trim_rcsum(skb, ulen))
-                        goto discard;
-                saddr = &skb->nh.ipv6h->saddr;
-                daddr = &skb->nh.ipv6h->daddr;
-                uh = skb->h.uh;
-        }
+                if (ulen < skb->len) {
+                        if (pskb_trim_rcsum(skb, ulen))
+                                goto short_packet;
+                        saddr = &skb->nh.ipv6h->saddr;
+                        daddr = &skb->nh.ipv6h->daddr;
+                        uh = skb->h.uh;
+                }
 
-        if (skb->ip_summed == CHECKSUM_COMPLETE &&
-            !csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum))
-                skb->ip_summed = CHECKSUM_UNNECESSARY;
+                if (udp6_csum_init(skb, uh))
+                        goto discard;
 
-        if (skb->ip_summed != CHECKSUM_UNNECESSARY)
-                skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
+        } else  {                       /* UDP-Lite validates cscov. */
+                if (udplite6_csum_init(skb, uh))
+                        goto discard;
+        }
 
         /* 
          *      Multicast receive code 
          */
-        if (ipv6_addr_is_multicast(daddr)) {
-                udpv6_mcast_deliver(uh, saddr, daddr, skb);
-                return 0;
-        }
+        if (ipv6_addr_is_multicast(daddr))
+                return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable);
 
         /* Unicast */
 
@@ -428,15 +448,16 @@ static int udpv6_rcv(struct sk_buff **pskb)
          * check socket cache ... must talk to Alan about his plans
          * for sock caches... i'll skip this for now.
          */
-        sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, inet6_iif(skb));
+        sk = __udp6_lib_lookup(saddr, uh->source,
+                               daddr, uh->dest, inet6_iif(skb), udptable);
 
         if (sk == NULL) {
                 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
                         goto discard;
 
-                if (skb_checksum_complete(skb))
+                if (udp_lib_checksum_complete(skb))
                         goto discard;
-                UDP6_INC_STATS_BH(UDP_MIB_NOPORTS);
+                UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, is_udplite);
 
                 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
 
@@ -451,14 +472,20 @@ static int udpv6_rcv(struct sk_buff **pskb)
         return(0);
 
 short_packet:   
-        if (net_ratelimit())
-                printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
+        LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
+                       is_udplite? "-Lite" : "",  ulen, skb->len);
 
 discard:
-        UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
+        UDP6_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
         kfree_skb(skb);
         return(0);      
 }
+
+static __inline__ int udpv6_rcv(struct sk_buff **pskb)
+{
+        return __udp6_lib_rcv(pskb, udp_hash, 0);
+}
+
 /*
  * Throw away all pending data and cancel the corking. Socket is locked.
  */
@@ -484,6 +511,7 @@ static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up)
         struct inet_sock *inet = inet_sk(sk);
         struct flowi *fl = &inet->cork.fl;
         int err = 0;
+        u32 csum = 0;
 
         /* Grab the skbuff where UDP header space exists. */
         if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
@@ -498,35 +526,17 @@ static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up)
         uh->len = htons(up->len);
         uh->check = 0;
 
-        if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
-                skb->ip_summed = CHECKSUM_NONE;
-                goto send;
-        }
-
-        if (skb_queue_len(&sk->sk_write_queue) == 1) {
-                skb->csum = csum_partial((char *)uh,
-                                sizeof(struct udphdr), skb->csum);
-                uh->check = csum_ipv6_magic(&fl->fl6_src,
-                                            &fl->fl6_dst,
-                                            up->len, fl->proto, skb->csum);
-        } else {
-                u32 tmp_csum = 0;
-
-                skb_queue_walk(&sk->sk_write_queue, skb) {
-                        tmp_csum = csum_add(tmp_csum, skb->csum);
-                }
-                tmp_csum = csum_partial((char *)uh,
-                                sizeof(struct udphdr), tmp_csum);
-                tmp_csum = csum_ipv6_magic(&fl->fl6_src,
-                                           &fl->fl6_dst,
-                                           up->len, fl->proto, tmp_csum);
-                uh->check = tmp_csum;
+        if (up->pcflag)
+                csum = udplite_csum_outgoing(sk, skb);
+         else
+                csum = udp_csum_outgoing(sk, skb);
 
-        }
+        /* add protocol-dependent pseudo-header */
+        uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
+                                    up->len, fl->proto, csum   );
         if (uh->check == 0)
                 uh->check = -1;
 
-send:
         err = ip6_push_pending_frames(sk);
 out:
         up->len = 0;
@@ -534,7 +544,7 @@ out:
         return err;
 }
 
-static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 
+int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
                   struct msghdr *msg, size_t len)
 {
         struct ipv6_txoptions opt_space;
@@ -554,6 +564,8 @@ static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
         int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
         int err;
         int connected = 0;
+        int is_udplite = up->pcflag;
+        int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
 
         /* destination address check */
         if (sin6) {
@@ -694,7 +706,7 @@ do_udp_sendmsg:
                 opt = fl6_merge_options(&opt_space, flowlabel, opt);
         opt = ipv6_fixup_options(&opt_space, opt);
 
-        fl.proto = IPPROTO_UDP;
+        fl.proto = sk->sk_protocol;
         ipv6_addr_copy(&fl.fl6_dst, daddr);
         if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
@@ -761,7 +773,8 @@ back_from_confirm:
 
 do_append_data:
         up->len += ulen;
-        err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen,
+        getfrag  =  is_udplite ?  udplite_getfrag : ip_generic_getfrag;
+        err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
                 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
                 (struct rt6_info*)dst,
                 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
@@ -793,7 +806,7 @@ do_append_data:
 out:
         fl6_sock_release(flowlabel);
         if (!err) {
-                UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS);
+                UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
                 return len;
         }
         /*
@@ -804,7 +817,7 @@ out:
          * seems like overkill.
          */
         if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
-                UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS);
+                UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
         }
         return err;
 
@@ -816,7 +829,7 @@ do_confirm:
         goto out;
 }
 
-static int udpv6_destroy_sock(struct sock *sk)
+int udpv6_destroy_sock(struct sock *sk)
 {
         lock_sock(sk);
         udp_v6_flush_pending_frames(sk);
@@ -854,7 +867,6 @@ static int do_udpv6_setsockopt(struct sock *sk, int level, int optname,
                         release_sock(sk);
                 }
                 break;
-                
         case UDP_ENCAP:
                 switch (val) {
                 case 0:
@@ -866,6 +878,24 @@ static int do_udpv6_setsockopt(struct sock *sk, int level, int optname,
                 }
                 break;
 
+        case UDPLITE_SEND_CSCOV:
+                if (!up->pcflag)         /* Disable the option on UDP sockets */
+                        return -ENOPROTOOPT;
+                if (val != 0 && val < 8) /* Illegal coverage: use default (8) */
+                        val = 8;
+                up->pcslen = val;
+                up->pcflag |= UDPLITE_SEND_CC;
+                break;
+
+        case UDPLITE_RECV_CSCOV:
+                if (!up->pcflag)         /* Disable the option on UDP sockets */
+                        return -ENOPROTOOPT;
+                if (val != 0 && val < 8) /* Avoid silly minimal values.       */
+                        val = 8;
+                up->pcrlen = val;
+                up->pcflag |= UDPLITE_RECV_CC;
+                break;
+
         default:
                 err = -ENOPROTOOPT;
                 break;
@@ -874,22 +904,21 @@ static int do_udpv6_setsockopt(struct sock *sk, int level, int optname,
         return err;
 }
 
-static int udpv6_setsockopt(struct sock *sk, int level, int optname,
-                          char __user *optval, int optlen)
+int udpv6_setsockopt(struct sock *sk, int level, int optname,
+                     char __user *optval, int optlen)
 {
-        if (level != SOL_UDP)
-                return ipv6_setsockopt(sk, level, optname, optval, optlen);
-        return do_udpv6_setsockopt(sk, level, optname, optval, optlen);
+        if (level == SOL_UDP  ||  level == SOL_UDPLITE)
+                return do_udpv6_setsockopt(sk, level, optname, optval, optlen);
+        return ipv6_setsockopt(sk, level, optname, optval, optlen);
 }
 
 #ifdef CONFIG_COMPAT
-static int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
-                                   char __user *optval, int optlen)
+int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
+                            char __user *optval, int optlen)
 {
-        if (level != SOL_UDP)
-                return compat_ipv6_setsockopt(sk, level, optname,
-                                              optval, optlen);
-        return do_udpv6_setsockopt(sk, level, optname, optval, optlen);
+        if (level == SOL_UDP  ||  level == SOL_UDPLITE)
+                return do_udpv6_setsockopt(sk, level, optname, optval, optlen);
+        return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
 }
 #endif
 
@@ -916,6 +945,14 @@ static int do_udpv6_getsockopt(struct sock *sk, int level, int optname,
                 val = up->encap_type;
                 break;
 
+        case UDPLITE_SEND_CSCOV:
+                val = up->pcslen;
+                break;
+
+        case UDPLITE_RECV_CSCOV:
+                val = up->pcrlen;
+                break;
+
         default:
                 return -ENOPROTOOPT;
         };
@@ -927,22 +964,21 @@ static int do_udpv6_getsockopt(struct sock *sk, int level, int optname,
         return 0;
 }
 
-static int udpv6_getsockopt(struct sock *sk, int level, int optname,
-                          char __user *optval, int __user *optlen)
+int udpv6_getsockopt(struct sock *sk, int level, int optname,
+                     char __user *optval, int __user *optlen)
 {
-        if (level != SOL_UDP)
-                return ipv6_getsockopt(sk, level, optname, optval, optlen);
-        return do_udpv6_getsockopt(sk, level, optname, optval, optlen);
+        if (level == SOL_UDP  ||  level == SOL_UDPLITE)
+                return do_udpv6_getsockopt(sk, level, optname, optval, optlen);
+        return ipv6_getsockopt(sk, level, optname, optval, optlen);
 }
 
 #ifdef CONFIG_COMPAT
-static int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
-                                   char __user *optval, int __user *optlen)
+int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
+                            char __user *optval, int __user *optlen)
 {
-        if (level != SOL_UDP)
-                return compat_ipv6_getsockopt(sk, level, optname,
-                                              optval, optlen);
-        return do_udpv6_getsockopt(sk, level, optname, optval, optlen);
+        if (level == SOL_UDP  ||  level == SOL_UDPLITE)
+                return do_udpv6_getsockopt(sk, level, optname, optval, optlen);
+        return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
 }
 #endif
 
@@ -983,7 +1019,7 @@ static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket
                    atomic_read(&sp->sk_refcnt), sp);
 }
 
-static int udp6_seq_show(struct seq_file *seq, void *v)
+int udp6_seq_show(struct seq_file *seq, void *v)
 {
         if (v == SEQ_START_TOKEN)
                 seq_printf(seq,
@@ -1002,6 +1038,7 @@ static struct udp_seq_afinfo udp6_seq_afinfo = {
         .owner          = THIS_MODULE,
         .name           = "udp6",
         .family         = AF_INET6,
+        .hashtable      = udp_hash,
         .seq_show       = udp6_seq_show,
         .seq_fops       = &udp6_seq_fops,
 };
@@ -1021,7 +1058,7 @@ void udp6_proc_exit(void) {
 struct proto udpv6_prot = {
         .name              = "UDPv6",
         .owner             = THIS_MODULE,
-        .close             = udpv6_close,
+        .close             = udp_lib_close,
         .connect           = ip6_datagram_connect,
         .disconnect        = udp_disconnect,
         .ioctl             = udp_ioctl,
@@ -1031,8 +1068,8 @@ struct proto udpv6_prot = {
         .sendmsg           = udpv6_sendmsg,
         .recvmsg           = udpv6_recvmsg,
         .backlog_rcv       = udpv6_queue_rcv_skb,
-        .hash              = udp_v6_hash,
-        .unhash            = udp_v6_unhash,
+        .hash              = udp_lib_hash,
+        .unhash            = udp_lib_unhash,
         .get_port          = udp_v6_get_port,
         .obj_size          = sizeof(struct udp6_sock),
 #ifdef CONFIG_COMPAT