netdev - [PATCH net-next v2 1/2] net: track link status of ipv6 nexthops

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Date:	Thu, 13 Aug 2015 10:39:00 -0400
From:	Andy Gospodarek <gospo@...ulusnetworks.com>
To:	netdev@...r.kernel.org
Cc:	Andy Gospodarek <gospo@...ulusnetworks.com>,
	Dinesh Dutt <ddutt@...ulusnetworks.com>
Subject: [PATCH net-next v2 1/2] net: track link status of ipv6 nexthops

Add support to track current link status of ipv6 nexthops to match
recent changes that added support for ipv4 nexthops.  This takes a
simple approach to track linkdown status for next-hops and simply
checks the dev for the dst entry and sets proper flags that to be used
in the netlink message.

v2: drop use of rt6i_nhflags since it is not needed right now

Signed-off-by: Andy Gospodarek <gospo@...ulusnetworks.com>
Signed-off-by: Dinesh Dutt <ddutt@...ulusnetworks.com>
---

I realize this patch might be a bit different expected based on
conversations on netdev yesterday, but I got a few off-list
communications that indicated a preference to not expand rt6_info at
this time -- despite the fact that expansion will likely be needed for
switchdev offload of ipv6 fib entries in the near future.

 net/ipv6/route.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 54fccf0..26b51e1 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2885,6 +2885,8 @@ static int rt6_fill_node(struct net *net,
 	else
 		rtm->rtm_type = RTN_UNICAST;
 	rtm->rtm_flags = 0;
+	if (!netif_carrier_ok(rt->dst.dev))
+		rtm->rtm_flags |= RTNH_F_LINKDOWN;
 	rtm->rtm_scope = RT_SCOPE_UNIVERSE;
 	rtm->rtm_protocol = rt->rt6i_protocol;
 	if (rt->rt6i_flags & RTF_DYNAMIC)
-- 
1.9.3

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