Commit 8c14586fc320 ("net: ipv6: Use passed in table for nexthop
lookups") introduced a regression: insertion of an IPv6 route in a table
not containing the appropriate connected route for the gateway but which
contained a non-connected route (like a default gateway) fails while it
was previously working:
$ ip link add eth0 type dummy
$ ip link set up dev eth0
$ ip addr add 2001:db8::1/64 dev eth0
$ ip route add ::/0 via 2001:db8::5 dev eth0 table 20
$ ip route add 2001:db8:cafe::1/128 via 2001:db8::6 dev eth0 table 20
RTNETLINK answers: No route to host
$ ip -6 route show table 20
default via 2001:db8::5 dev eth0 metric 1024 pref medium
After this patch, we get:
$ ip route add 2001:db8:cafe::1/128 via 2001:db8::6 dev eth0 table 20
$ ip -6 route show table 20
2001:db8:cafe::1 via 2001:db8::6 dev eth0 metric 1024 pref medium
default via 2001:db8::5 dev eth0 metric 1024 pref medium
Signed-off-by: Vincent Bernat <vinc...@bernat.im>
---
net/ipv6/route.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index ad4a7ff301fc..2c6c7257ff75 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1994,6 +1994,14 @@ static struct rt6_info *ip6_route_info_create(struct
fib6_config *cfg)
if (cfg->fc_table)
grt = ip6_nh_lookup_table(net, cfg, gw_addr);
+ if (grt) {
+ if (grt->rt6i_flags & RTF_GATEWAY ||
+ (dev && dev != grt->dst.dev)) {
+ ip6_rt_put(grt);
+ grt = NULL;
+ }
+ }
+
if (!grt)
grt = rt6_lookup(net, gw_addr, NULL,
cfg->fc_ifindex, 1);
--
2.9.3
