netdev - [PATCH 1/4] sctp: Drop ICMP packet too big message with MTU larger than current PMTU

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Message-Id: <1224641327-11913-2-git-send-email-vladislav.yasevich@hp.com>
Date:	Tue, 21 Oct 2008 22:08:44 -0400
From:	Vlad Yasevich <vladislav.yasevich@...com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
	Wei Yongjun <yjwei@...fujitsu.com>,
	Vlad Yasevich <vladislav.yasevich@...com>
Subject: [PATCH 1/4] sctp: Drop ICMP packet too big message with MTU larger than current PMTU

From: Wei Yongjun <yjwei@...fujitsu.com>

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@...fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@...com>
---
 net/sctp/input.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/sctp/input.c b/net/sctp/input.c
index a49fa80..bf612d9 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)) {
-- 
1.5.3.5

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