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authorEric Dumazet <edumazet@google.com>2012-07-26 16:18:11 +0400
committerDavid S. Miller <davem@davemloft.net>2012-07-27 02:50:39 +0400
commitc7109986db3c945f50ceed884a30e0fd8af3b89b (patch)
treec0852e90a7d06bdc95a54d6adad19d2a9e3d7d5e /net
parentc6cffba4ffa26a8ffacd0bb9f3144e34f20da7de (diff)
downloadlinux-c7109986db3c945f50ceed884a30e0fd8af3b89b.tar.xz
ipv6: Early TCP socket demux
This is the IPv6 missing bits for infrastructure added in commit 41063e9dd1195 (ipv4: Early TCP socket demux.) Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/ip_input.c1
-rw-r--r--net/ipv6/ip6_input.c13
-rw-r--r--net/ipv6/tcp_ipv6.c38
3 files changed, 50 insertions, 2 deletions
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index bda8cac2ae91..981ff1eef28c 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -314,6 +314,7 @@ drop:
}
int sysctl_ip_early_demux __read_mostly = 1;
+EXPORT_SYMBOL(sysctl_ip_early_demux);
static int ip_rcv_finish(struct sk_buff *skb)
{
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index 5ab923e51af3..47975e363fcd 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -47,9 +47,18 @@
-inline int ip6_rcv_finish( struct sk_buff *skb)
+int ip6_rcv_finish(struct sk_buff *skb)
{
- if (skb_dst(skb) == NULL)
+ if (sysctl_ip_early_demux && !skb_dst(skb)) {
+ const struct inet6_protocol *ipprot;
+
+ rcu_read_lock();
+ ipprot = rcu_dereference(inet6_protos[ipv6_hdr(skb)->nexthdr]);
+ if (ipprot && ipprot->early_demux)
+ ipprot->early_demux(skb);
+ rcu_read_unlock();
+ }
+ if (!skb_dst(skb))
ip6_route_input(skb);
return dst_input(skb);
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index f49476e2d884..221224e72507 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -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,