netdev - [PATCH] ipv6: clear RTF_EXPIRES when call ip6_rt

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Message-Id: <1387182666-31301-1-git-send-email-roy.qing.li@gmail.com>
Date:	Mon, 16 Dec 2013 16:31:05 +0800
From:	roy.qing.li@...il.com
To:	netdev@...r.kernel.org
Subject: [PATCH] ipv6: clear RTF_EXPIRES when call ip6_rt_copy

From: Li RongQing <roy.qing.li@...il.com>

The commit ecd9883724b [ipv6: fix race condition regarding dst->expires and
dst->from.] removed rt6_clean_expires in ip6_rt_copy, which causes the TAHI
test case v6LC.4.1.4 { Reduce PMTU On-link } failed, since the newly generated
rt maybe always expired {with RTF_EXPIRES flag, dst.expires is 0, and dst.from
is NULL}.

Fix it by clearing RTF_EXPIRES as before 1716a96101[ipv6: fix problem with
expired dst cache]

Signed-off-by: Li RongQing <roy.qing.li@...il.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 a1a5752..e3d7f21 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1908,7 +1908,7 @@ static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
 			rt->rt6i_gateway = ort->rt6i_gateway;
 		else
 			rt->rt6i_gateway = *dest;
-		rt->rt6i_flags = ort->rt6i_flags;
+		rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
 		if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) ==
 		    (RTF_DEFAULT | RTF_ADDRCONF))
 			rt6_set_from(rt, ort);
-- 
1.7.10.4

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