From: Wei Yongjun <yjwei@cn.fujitsu.com>
To: netdev@vger.kernel.org
Subject: [PATCH] Fix bug of update IPv4 PMTU when received ICMP Fragmentation Needed message
Date: Fri, 01 Jun 2007 11:51:43 +0800 [thread overview]
Message-ID: <465F97CF.1060508@cn.fujitsu.com> (raw)
When received ICMP Fragmentation Needed message, PATH MTU is always set
to the 576 even if MTU in ICMP message is lager then 576. This is
because of error condition in function ip_rt_frag_needed(), now if
packet size of that ICMP message is less then new MTU, packet size will
be used ,but RFC says ICMP error message return as much as we can
without exceeding 576 bytes.
This patch has Fixed this BUG.
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
--- net/ipv4/route.c.orig 2007-05-25 05:22:47.000000000 +0800
+++ net/ipv4/route.c 2007-06-01 11:42:55.000000000 +0800
@@ -1424,7 +1424,7 @@ unsigned short ip_rt_frag_needed(struct
!(dst_metric_locked(&rth->u.dst, RTAX_MTU))) {
unsigned short mtu = new_mtu;
- if (new_mtu < 68 || new_mtu >= old_mtu) {
+ if (new_mtu < 68) {
/* BSD 4.2 compatibility hack :-( */
if (mtu == 0 &&
next reply other threads:[~2007-06-01 3:57 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-01 3:51 Wei Yongjun [this message]
2007-06-02 10:49 ` [PATCH] Fix bug of update IPv4 PMTU when received ICMP Fragmentation Needed message Herbert Xu
2007-06-04 0:39 ` Wei Yongjun
2007-06-04 2:55 ` Herbert Xu
2007-06-04 4:03 ` Wei Yongjun
2007-06-04 4:14 ` Herbert Xu
2007-06-04 4:32 ` Wei Yongjun
2007-06-04 4:55 ` Herbert Xu
2007-06-04 5:38 ` Wei Yongjun
2012-03-21 11:40 ` Ranjeeth
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