[PATCH net] net/ipv6: Handle reject routes with onlink flag

[PATCH net] net/ipv6: Handle reject routes with onlink flag

[David Ahern]

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 <dsahern@gmail.com>
---
 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;
 		}
-- 
2.11.0

Re: [PATCH net] net/ipv6: Handle reject routes with onlink flag

[David Miller]

From: David Ahern <dsahern@gmail.com>
Date: Tue,  6 Feb 2018 12:14:12 -0800

> 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 <dsahern@gmail.com>

Applied.