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| author | Florian Westphal <fw@strlen.de> | 2015-08-07 10:54:28 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-08-10 13:29:22 -0700 |
| commit | 330567b71d8716704b189454553c2696e1eceb6c (patch) | |
| tree | 88a1f4c609912a438d445da26ec9e34ac5b6538a | |
| parent | 4e7c1330689e27556de407d3fdadc65ffff5eb12 (diff) | |
| download | linux-stable-330567b71d8716704b189454553c2696e1eceb6c.tar.gz linux-stable-330567b71d8716704b189454553c2696e1eceb6c.tar.bz2 linux-stable-330567b71d8716704b189454553c2696e1eceb6c.zip | |
ipv6: don't reject link-local nexthop on other interface
48ed7b26faa7 ("ipv6: reject locally assigned nexthop addresses") is too
strict; it rejects following corner-case:
ip -6 route add default via fe80::1:2:3 dev eth1
[ where fe80::1:2:3 is assigned to a local interface, but not eth1 ]
Fix this by restricting search to given device if nh is linklocal.
Joint work with Hannes Frederic Sowa.
Fixes: 48ed7b26faa7 ("ipv6: reject locally assigned nexthop addresses")
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv6/route.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 6090969937f8..9de4d2bcd916 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -1831,6 +1831,7 @@ int ip6_route_add(struct fib6_config *cfg) int gwa_type; gw_addr = &cfg->fc_gateway; + gwa_type = ipv6_addr_type(gw_addr); /* if gw_addr is local we will fail to detect this in case * address is still TENTATIVE (DAD in progress). rt6_lookup() @@ -1838,11 +1839,12 @@ int ip6_route_add(struct fib6_config *cfg) * prefix route was assigned to, which might be non-loopback. */ err = -EINVAL; - if (ipv6_chk_addr_and_flags(net, gw_addr, NULL, 0, 0)) + if (ipv6_chk_addr_and_flags(net, gw_addr, + gwa_type & IPV6_ADDR_LINKLOCAL ? + dev : NULL, 0, 0)) goto out; rt->rt6i_gateway = *gw_addr; - gwa_type = ipv6_addr_type(gw_addr); if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { struct rt6_info *grt; |