IPv6 allows routes to be installed when the device is not up (admin up).
Worse, it does not mark it as LINKDOWN. IPv4 does not allow it and really
there is no reason for IPv6 to allow it, so check the flags and deny if
device is admin down.
Signed-off-by: David Ahern <dsah...@gmail.com>
---
v3
- moved err=-ENETDOWN under the if check per Eric's request
- left the up check using dev->flags for consistency with IPv4
and that it is used more often in ipv4 and ivp6 code than
netif_running
v2
- missed setting err to -ENETDOWN (thanks for catching that Roopa)
net/ipv6/route.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index f85da2f1e729..aa4411c81e7e 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2734,6 +2734,12 @@ static struct rt6_info *ip6_route_info_create(struct
fib6_config *cfg,
if (!dev)
goto out;
+ if (!(dev->flags & IFF_UP)) {
+ NL_SET_ERR_MSG(extack, "Nexthop device is not up");
+ err = -ENETDOWN;
+ goto out;
+ }
+
if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
NL_SET_ERR_MSG(extack, "Invalid source address");
--
2.11.0
