netdev - [PATCH net-next] net/ipv6: Do not allow route add with a device that is down

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Date:   Tue, 23 Jan 2018 19:13:43 -0800
From:   David Ahern <dsahern@...il.com>
To:     netdev@...r.kernel.org
Cc:     yoshfuji@...ux-ipv6.org, idosch@...lanox.com,
        David Ahern <dsahern@...il.com>
Subject: [PATCH net-next] net/ipv6: Do not allow route add with a device that is down

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 <dsahern@...il.com>
---
 net/ipv6/route.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index f85da2f1e729..689670713744 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2734,6 +2734,11 @@ 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");
+		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