tcp: early_demux fixes
1) Remove a non needed pskb_may_pull() in tcp_v4_early_demux()
and fix a potential bug if skb->head was reallocated
(iph & th pointers were not reloaded)
TCP stack will pull/check headers anyway.
2) must reload iph in ip_rcv_finish() after early_demux()
call since skb->head might have changed.
3) skb->dev->ifindex can be now replaced by skb->skb_iif
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 3e30548..b6b07c9 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1686,7 +1686,6 @@
struct net *net = dev_net(skb->dev);
const struct iphdr *iph;
const struct tcphdr *th;
- struct net_device *dev;
struct sock *sk;
if (skb->pkt_type != PACKET_HOST)
@@ -1701,14 +1700,10 @@
if (th->doff < sizeof(struct tcphdr) / 4)
return;
- if (!pskb_may_pull(skb, ip_hdrlen(skb) + th->doff * 4))
- return;
-
- dev = skb->dev;
sk = __inet_lookup_established(net, &tcp_hashinfo,
iph->saddr, th->source,
iph->daddr, ntohs(th->dest),
- dev->ifindex);
+ skb->skb_iif);
if (sk) {
skb->sk = sk;
skb->destructor = sock_edemux;
@@ -1718,7 +1713,7 @@
if (dst)
dst = dst_check(dst, 0);
if (dst &&
- icsk->rx_dst_ifindex == dev->ifindex)
+ icsk->rx_dst_ifindex == skb->skb_iif)
skb_dst_set_noref(skb, dst);
}
}