This is a note to let you know that I've just added the patch titled
ipv6: stop sending PTB packets for MTU < 1280
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ipv6-stop-sending-ptb-packets-for-mtu-1280.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Feb 12 09:25:54 HKT 2015
From: Hagen Paul Pfeifer <hagen@xxxxxxxx>
Date: Thu, 15 Jan 2015 22:34:25 +0100
Subject: ipv6: stop sending PTB packets for MTU < 1280
From: Hagen Paul Pfeifer <hagen@xxxxxxxx>
[ Upstream commit 9d289715eb5c252ae15bd547cb252ca547a3c4f2 ]
Reduce the attack vector and stop generating IPv6 Fragment Header for
paths with an MTU smaller than the minimum required IPv6 MTU
size (1280 byte) - called atomic fragments.
See IETF I-D "Deprecating the Generation of IPv6 Atomic Fragments" [1]
for more information and how this "feature" can be misused.
[1] https://tools.ietf.org/html/draft-ietf-6man-deprecate-atomfrag-generation-00
Signed-off-by: Fernando Gont <fgont@xxxxxxxxxxxxxxx>
Signed-off-by: Hagen Paul Pfeifer <hagen@xxxxxxxx>
Acked-by: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv6/route.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1150,12 +1150,9 @@ static void ip6_rt_update_pmtu(struct ds
struct net *net = dev_net(dst->dev);
rt6->rt6i_flags |= RTF_MODIFIED;
- if (mtu < IPV6_MIN_MTU) {
- u32 features = dst_metric(dst, RTAX_FEATURES);
+ if (mtu < IPV6_MIN_MTU)
mtu = IPV6_MIN_MTU;
- features |= RTAX_FEATURE_ALLFRAG;
- dst_metric_set(dst, RTAX_FEATURES, features);
- }
+
dst_metric_set(dst, RTAX_MTU, mtu);
rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires);
}
Patches currently in stable-queue which might be from hagen@xxxxxxxx are
queue-3.18/ipv6-stop-sending-ptb-packets-for-mtu-1280.patch
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