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ipv4: fix TCP early demux 

commit 92101b3b2e (ipv4: Prepare for change of rt->rt_iif encoding.)
invalidated TCP early demux, because rx_dst_ifindex is not properly
initialized and checked.

Also remove the use of inet_iif(skb) in favor or skb->skb_iif

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2012-07-27 06:23:40 +00:00 committed by David S. Miller
parent b1beb681cb
commit 505fbcf035
3 changed files with 8 additions and 8 deletions
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1
net/ipv4/tcp_input.c
View File

@ -5603,6 +5603,7 @@ void tcp_finish_connect(struct sock *sk, struct sk_buff *skb)
if (skb != NULL) {
sk->sk_rx_dst = dst_clone(skb_dst(skb));
inet_sk(sk)->rx_dst_ifindex = skb->skb_iif;
security_inet_conn_established(sk, skb);
}

14
net/ipv4/tcp_ipv4.c
View File

@ -1620,17 +1620,15 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
sock_rps_save_rxhash(sk, skb);
if (sk->sk_rx_dst) {
struct dst_entry *dst = sk->sk_rx_dst;
if (dst->ops->check(dst, 0) == NULL) {
if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif ||
dst->ops->check(dst, 0) == NULL) {
dst_release(dst);
sk->sk_rx_dst = NULL;
}
}
if (unlikely(sk->sk_rx_dst == NULL)) {
struct inet_sock *icsk = inet_sk(sk);
struct rtable *rt = skb_rtable(skb);
sk->sk_rx_dst = dst_clone(&rt->dst);
icsk->rx_dst_ifindex = inet_iif(skb);
sk->sk_rx_dst = dst_clone(skb_dst(skb));
inet_sk(sk)->rx_dst_ifindex = skb->skb_iif;
}
if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) {
rsk = sk;
@ -1709,11 +1707,11 @@ void tcp_v4_early_demux(struct sk_buff *skb)
skb->destructor = sock_edemux;
if (sk->sk_state != TCP_TIME_WAIT) {
struct dst_entry *dst = sk->sk_rx_dst;
struct inet_sock *icsk = inet_sk(sk);
if (dst)
dst = dst_check(dst, 0);
if (dst &&
icsk->rx_dst_ifindex == skb->skb_iif)
inet_sk(sk)->rx_dst_ifindex == skb->skb_iif)
skb_dst_set_noref(skb, dst);
}
}

1
net/ipv4/tcp_minisocks.c
View File

@ -388,6 +388,7 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
struct tcp_cookie_values *oldcvp = oldtp->cookie_values;
newsk->sk_rx_dst = dst_clone(skb_dst(skb));
inet_sk(newsk)->rx_dst_ifindex = skb->skb_iif;
/* TCP Cookie Transactions require space for the cookie pair,
* as it differs for each connection. There is no need to