[IPV6]: Introduce inet6_timewait_sock

Out of tcp6_timewait_sock, that now is just an aggregation of
inet_timewait_sock and inet6_timewait_sock, using tw_ipv6_offset in struct
inet_timewait_sock, that is common to the IPv6 transport protocols that use
timewait sockets, like DCCP and TCP.

tw_ipv6_offset plays the struct inet_sock pinfo6 role, i.e. for the generic
code to find the IPv6 area in a timewait sock.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 5 insertions, 4 deletions

diff --git a/include/net/inet6_hashtables.h b/include/net/inet6_hashtables.h
index a4a204f99ea6..25f708ff020e 100644
--- a/include/net/inet6_hashtables.h
+++ b/include/net/inet6_hashtables.h
@@ -110,10 +110,10 @@ static inline struct sock *
 
                 if(*((__u32 *)&(tw->tw_dport))  == ports        &&
                    sk->sk_family                == PF_INET6) {
-                        const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk);
+                        const struct inet6_timewait_sock *tw6 = inet6_twsk(sk);
 
-                        if (ipv6_addr_equal(&tcp6tw->tw_v6_daddr, saddr)        &&
-                            ipv6_addr_equal(&tcp6tw->tw_v6_rcv_saddr, daddr)    &&
+                        if (ipv6_addr_equal(&tw6->tw_v6_daddr, saddr)   &&
+                            ipv6_addr_equal(&tw6->tw_v6_rcv_saddr, daddr)       &&
                             (!sk->sk_bound_dev_if || sk->sk_bound_dev_if == dif))
                                 goto hit;
                 }
diff --git a/include/net/inet_timewait_sock.h b/include/net/inet_timewait_sock.h
index 28f7b2103505..ca240f856c46 100644
--- a/include/net/inet_timewait_sock.h
+++ b/include/net/inet_timewait_sock.h
@@ -127,7 +127,8 @@ struct inet_timewait_sock {
         __u16                   tw_num;
         /* And these are ours. */
         __u8                    tw_ipv6only:1;
-        /* 31 bits hole, try to pack */
+        /* 15 bits hole, try to pack */
+        __u16                   tw_ipv6_offset;
         int                     tw_timeout;
         unsigned long           tw_ttd;
         struct inet_bind_bucket *tw_tb;