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xfrm4: Don't call icmp_send on local error 

Calling icmp_send() on a local message size error leads to
an incorrect update of the path mtu. So use ip_local_error()
instead to notify the socket about the error.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Steffen Klassert 2011-06-29 23:20:41 +00:00 committed by David S. Miller
parent c146066ab8
commit b00897b881
1 changed files with 6 additions and 1 deletions
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7
net/ipv4/xfrm4_output.c
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@ -32,7 +32,12 @@ static int xfrm4_tunnel_check_size(struct sk_buff *skb)
dst = skb_dst(skb); dst = skb_dst(skb);
mtu = dst_mtu(dst); mtu = dst_mtu(dst);
if (skb->len > mtu) { if (skb->len > mtu) {
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); if (skb->sk)
ip_local_error(skb->sk, EMSGSIZE, ip_hdr(skb)->daddr,
inet_sk(skb->sk)->inet_dport, mtu);
else
icmp_send(skb, ICMP_DEST_UNREACH,
ICMP_FRAG_NEEDED, htonl(mtu));
ret = -EMSGSIZE; ret = -EMSGSIZE;
} }
out: out: