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IPv4: early demux can return an error code

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Currently no error is emitted, but this infrastructure will
used by the next patch to allow source address validation
for mcast sockets.
Since early demux can do a route lookup and an ipv4 route
lookup can return an error code this is consistent with the
current ipv4 route infrastructure.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni
2017-09-28 15:51:36 +02:00
committed by David S. Miller
parent d41bb33ba3
commit 7487449c86
6 changed files with 30 additions and 23 deletions
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9
net/ipv4/tcp_ipv4.c
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@@ -1503,23 +1503,23 @@ csum_err:
}
EXPORT_SYMBOL(tcp_v4_do_rcv);
void tcp_v4_early_demux(struct sk_buff *skb)
int tcp_v4_early_demux(struct sk_buff *skb)
{
const struct iphdr *iph;
const struct tcphdr *th;
struct sock *sk;
if (skb->pkt_type != PACKET_HOST)
return;
return 0;
if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr)))
return;
return 0;
iph = ip_hdr(skb);
th = tcp_hdr(skb);
if (th->doff < sizeof(struct tcphdr) / 4)
return;
return 0;
sk = __inet_lookup_established(dev_net(skb->dev), &tcp_hashinfo,
iph->saddr, th->source,
@@ -1538,6 +1538,7 @@ void tcp_v4_early_demux(struct sk_buff *skb)
skb_dst_set_noref(skb, dst);
}
}
return 0;
}
bool tcp_add_backlog(struct sock *sk, struct sk_buff *skb)