This is a note to let you know that I've just added the patch titled
gre: add link local route when local addr is any
to the 3.13-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:
gre-add-link-local-route-when-local-addr-is-any.patch
and it can be found in the queue-3.13 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 27 20:11:26 PST 2014
From: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>
Date: Mon, 17 Feb 2014 14:22:21 +0100
Subject: gre: add link local route when local addr is any
From: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>
[ Upstream commit 08b44656c08c8c2f73cdac2a058be2880e3361f2 ]
This bug was reported by Steinar H. Gunderson and was introduced by commit
f7cb8886335d ("sit/gre6: don't try to add the same route two times").
root@morgental:~# ip tunnel add foo mode gre remote 1.2.3.4 ttl 64
root@morgental:~# ip link set foo up mtu 1468
root@morgental:~# ip -6 route show dev foo
fe80::/64 proto kernel metric 256
but after the above commit, no such route shows up.
There is no link local route because dev->dev_addr is 0 (because local ipv4
address is 0), hence no link local address is configured.
In this scenario, the link local address is added manually: 'ip -6 addr add
fe80::1 dev foo' and because prefix is /128, no link local route is added by the
kernel.
Even if the right things to do is to add the link local address with a /64
prefix, we need to restore the previous behavior to avoid breaking userpace.
Reported-by: Steinar H. Gunderson <sesse@xxxxxxxxxxxx>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv6/addrconf.c | 2 ++
1 file changed, 2 insertions(+)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2726,6 +2726,8 @@ static void addrconf_gre_config(struct n
ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
addrconf_add_linklocal(idev, &addr);
+ else
+ addrconf_prefix_route(&addr, 64, dev, 0, 0);
}
#endif
Patches currently in stable-queue which might be from nicolas.dichtel@xxxxxxxxx are
queue-3.13/gre-add-link-local-route-when-local-addr-is-any.patch
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