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net/ipv6/sit.c: return unhandled skb to tunnel4_rcv

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I found a problem using an IPv6 over IPv4 tunnel.  When CONFIG_IPV6_SIT
was enabled, the packets would be rejected as net/ipv6/sit.c was catching
all IPPROTO_IPV6 packets and returning an ICMP port unreachable error.

I think this patch fixes the problem cleanly.  I believe the code in
net/ipv4/tunnel4.c:tunnel4_rcv takes care of it properly if none of the
handlers claim the skb.

Signed-off-by: David McCullough <david_mccullough@mcafee.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David McCullough 2010-11-29 19:32:34 +00:00 committed by David S. Miller
parent d13a2cb63d
commit 6dcdd1b369
1 changed files with 2 additions and 1 deletions
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3
net/ipv6/sit.c
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@ -606,8 +606,9 @@ static int ipip6_rcv(struct sk_buff *skb)
return 0;
}
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
/* no tunnel matched, let upstream know, ipsec may handle it */
rcu_read_unlock();
return 1;
out:
kfree_skb(skb);
return 0;