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authorWei Yongjun <yjwei@cn.fujitsu.com>2008-10-23 00:59:52 -0700
committerDavid S. Miller <davem@davemloft.net>2008-10-23 00:59:52 -0700
commit91bd6b1e030266cf87d3f567b49f0fa60a7318ba (patch)
treed67e4365680e59a6eed1a13847f5fb9e016a7eed /net
parentdcc51417e5ee71bc1984825c23616030d57b83a4 (diff)
sctp: Drop ICMP packet too big message with MTU larger than current PMTU
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>
Diffstat (limited to 'net')
-rw-r--r--net/sctp/input.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sctp/input.c b/net/sctp/input.c
index a49fa80b57b9..bf612d954d41 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -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)) {

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