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ipv6: Early TCP socket demux

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This is the IPv6 missing bits for infrastructure added in commit
41063e9dd1 (ipv4: Early TCP socket demux.)

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2012-07-26 12:18:11 +00:00 • committed by David S. Miller
parent c6cffba4ff
commit c7109986db
5 changed files with 59 additions and 8 deletions
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38
net/ipv6/tcp_ipv6.c
View file

@ -1674,6 +1674,43 @@ do_time_wait:
goto discard_it;
}
static void tcp_v6_early_demux(struct sk_buff *skb)
{
const struct ipv6hdr *hdr;
const struct tcphdr *th;
struct sock *sk;
if (skb->pkt_type != PACKET_HOST)
return;
if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr)))
return;
hdr = ipv6_hdr(skb);
th = tcp_hdr(skb);
if (th->doff < sizeof(struct tcphdr) / 4)
return;
sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo,
&hdr->saddr, th->source,
&hdr->daddr, ntohs(th->dest),
inet6_iif(skb));
if (sk) {
skb->sk = sk;
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 == inet6_iif(skb))
skb_dst_set_noref(skb, dst);
}
}
}
static struct timewait_sock_ops tcp6_timewait_sock_ops = {
.twsk_obj_size = sizeof(struct tcp6_timewait_sock),
.twsk_unique = tcp_twsk_unique,
@ -1984,6 +2021,7 @@ struct proto tcpv6_prot = {
};
static const struct inet6_protocol tcpv6_protocol = {
.early_demux = tcp_v6_early_demux,
.handler = tcp_v6_rcv,
.err_handler = tcp_v6_err,
.gso_send_check = tcp_v6_gso_send_check,