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sctp: Drop ICMP packet too big message with MTU larger than current PMTU

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If ICMP packet too big message is received with MTU larger than current
PMTU, SCTP will still accept this ICMP message and sync the PMTU of assoc
with the wrong MTU.

Endpoing A                 Endpoint B
(ESTABLISHED)              (ESTABLISHED)
ICMP         --------->
(packet too big, MTU too larger)
                           sync PMTU

This patch fixed the problem by drop that ICMP message.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wei Yongjun 2008-10-23 00:59:52 -07:00 committed by David S. Miller
parent dcc51417e5
commit 91bd6b1e03
1 changed files with 1 additions and 1 deletions
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2
net/sctp/input.c
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@ -369,7 +369,7 @@ static void sctp_add_backlog(struct sock *sk, struct sk_buff *skb)
void sctp_icmp_frag_needed(struct sock *sk, struct sctp_association *asoc,
struct sctp_transport *t, __u32 pmtu)
{
if (!t || (t->pathmtu == pmtu))
if (!t || (t->pathmtu <= pmtu))
return;
if (sock_owned_by_user(sk)) {