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| author | Nicolas Dichtel <nicolas.dichtel@6wind.com> | 2014-02-17 14:22:21 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-02-17 14:08:26 -0500 |
| commit | 08b44656c08c8c2f73cdac2a058be2880e3361f2 (patch) | |
| tree | 284cb8e9cfa8c3ec410b7b45db199184f58ccbc9 /net/ipv6/addrconf.c | |
| parent | 0fd5d57ba3456c4d0b77d1ae64be4818b47d7545 (diff) | |
| download | linux-08b44656c08c8c2f73cdac2a058be2880e3361f2.tar.gz linux-08b44656c08c8c2f73cdac2a058be2880e3361f2.tar.bz2 linux-08b44656c08c8c2f73cdac2a058be2880e3361f2.zip | |
gre: add link local route when local addr is any
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@samfundet.no>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/addrconf.c')
| -rw-r--r-- | net/ipv6/addrconf.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index ad235690684c..fdbfeca36d63 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -2783,6 +2783,8 @@ static void addrconf_gre_config(struct net_device *dev) 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 |