netdev - [PATCH RFC 1/2] ipv6: Fix after pmtu events dissapearing host routes

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Date:	Wed, 28 Jan 2015 13:11:51 +0100
From:	Steffen Klassert <steffen.klassert@...unet.com>
To:	Yang Yingliang <yangyingliang@...wei.com>
CC:	netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH RFC 1/2] ipv6: Fix after pmtu events dissapearing host routes

We currently don't clone host routes before we use them.
If a pmtu event is received on such a route, it gets
an expires value. As soon as the expiration time is
elapsed, the route is deleted. As a result, the host
is not reachable any more.

We fix this by cloning host routes if they are gatewayed,
i.e. if pmtu events can happen.

Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
---
 net/ipv6/route.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index c910831..3e864e7 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -961,7 +961,7 @@ redo_rt6_select:
 
 	if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
 		nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
-	else if (!(rt->dst.flags & DST_HOST))
+	else if (!(rt->dst.flags & DST_HOST) || (rt->rt6i_flags & RTF_GATEWAY))
 		nrt = rt6_alloc_clone(rt, &fl6->daddr);
 	else
 		goto out2;
-- 
1.9.1

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