net: ipv6: fix TCP early demux

[pandora-kernel.git] / net / ipv6 / tcp_ipv6.c

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index c66b90f..5a439e9 100644 (file)
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1447,7 +1447,17 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
                opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC));
 
        if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
+               struct dst_entry *dst = sk->sk_rx_dst;
+
                sock_rps_save_rxhash(sk, skb);
+               if (dst) {
+                       if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif ||
+                           dst->ops->check(dst, np->rx_dst_cookie) == NULL) {
+                               dst_release(dst);
+                               sk->sk_rx_dst = NULL;
+                       }
+               }
+
                if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
                        goto reset;
                if (opt_skb)
@@ -1705,9 +1715,9 @@ static void tcp_v6_early_demux(struct sk_buff *skb)
                        struct dst_entry *dst = sk->sk_rx_dst;
                        struct inet_sock *icsk = inet_sk(sk);
                        if (dst)
-                               dst = dst_check(dst, 0);
+                               dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
                        if (dst &&
-                           icsk->rx_dst_ifindex == inet6_iif(skb))
+                           icsk->rx_dst_ifindex == skb->skb_iif)
                                skb_dst_set_noref(skb, dst);
                }
        }
@@ -1719,10 +1729,23 @@ static struct timewait_sock_ops tcp6_timewait_sock_ops = {
        .twsk_destructor= tcp_twsk_destructor,
 };
 
+static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb)
+{
+       struct dst_entry *dst = skb_dst(skb);
+       const struct rt6_info *rt = (const struct rt6_info *)dst;
+
+       dst_hold(dst);
+       sk->sk_rx_dst = dst;
+       inet_sk(sk)->rx_dst_ifindex = skb->skb_iif;
+       if (rt->rt6i_node)
+               inet6_sk(sk)->rx_dst_cookie = rt->rt6i_node->fn_sernum;
+}
+
 static const struct inet_connection_sock_af_ops ipv6_specific = {
        .queue_xmit        = inet6_csk_xmit,
        .send_check        = tcp_v6_send_check,
        .rebuild_header    = inet6_sk_rebuild_header,
+       .sk_rx_dst_set     = inet6_sk_rx_dst_set,
        .conn_request      = tcp_v6_conn_request,
        .syn_recv_sock     = tcp_v6_syn_recv_sock,
        .net_header_len    = sizeof(struct ipv6hdr),