net/ipv6: Handle reject routes with onlink flag

Web:        https://git.kernel.org/torvalds/c/58e354c01b1906b603dcdb28ec35250b09eac625
Commit:     58e354c01b1906b603dcdb28ec35250b09eac625
Parent:     c861ef83d771362ed0475cd510eb56cf4126ef34
Refname:    refs/heads/master
Author:     David Ahern <[email protected]>
AuthorDate: Tue Feb 6 12:14:12 2018 -0800
Committer:  David S. Miller <[email protected]>
CommitDate: Wed Feb 7 21:52:06 2018 -0500

    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: fc1e64e1092f ("net/ipv6: Add support for onlink flag")
    Signed-off-by: David Ahern <[email protected]>
    Signed-off-by: David S. Miller <[email protected]>
---
 net/ipv6/route.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index fb2d251c0500..69c43d289c69 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -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;
 		}
--
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