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net/ipv6: Handle reject routes with onlink flag 

Verification of nexthops with onlink flag need to handle unreachable
routes. The lookup is only intended to validate the gateway address
is not a local address and if the gateway resolves the egress device
must match the given device. Hence, hitting any default reject route
is ok.

Fixes: fc1e64e109 ("net/ipv6: Add support for onlink flag")
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2018-02-06 12:14:12 -08:00 committed by David S. Miller
parent c861ef83d7
commit 58e354c01b
1 changed files with 2 additions and 1 deletions
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3
net/ipv6/route.c
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@ -2488,7 +2488,8 @@ static int ip6_route_check_nh_onlink(struct net *net,
err = 0;
grt = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0);
if (grt) {
if (grt->rt6i_flags & flags || dev != grt->dst.dev) {
if (!grt->dst.error &&
(grt->rt6i_flags & flags || dev != grt->dst.dev)) {
NL_SET_ERR_MSG(extack, "Nexthop has invalid gateway");
err = -EINVAL;
}