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Subject[136/156] ipv6: Dont drop cache route entry unless timer actually expired.
2.6.33-stable review patch.  If anyone has any objections, please let us know.

------------------
From: YOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@linux-ipv6.org>

[ Upstream commit 54c1a859efd9fd6cda05bc700315ba2519c14eba ]

This is ipv6 variant of the commit 5e016cbf6.. ("ipv4: Don't drop
redirected route cache entry unless PTMU actually expired")
by Guenter Roeck <guenter.roeck@ericsson.com>.

Remove cache route entry in ipv6_negative_advice() only if
the timer is expired.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
net/ipv6/route.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -897,12 +897,17 @@ static struct dst_entry *ip6_negative_ad
struct rt6_info *rt = (struct rt6_info *) dst;

if (rt) {
- if (rt->rt6i_flags & RTF_CACHE)
- ip6_del_rt(rt);
- else
+ if (rt->rt6i_flags & RTF_CACHE) {
+ if (rt6_check_expired(rt)) {
+ ip6_del_rt(rt);
+ dst = NULL;
+ }
+ } else {
dst_release(dst);
+ dst = NULL;
+ }
}
- return NULL;
+ return dst;
}

static void ip6_link_failure(struct sk_buff *skb)

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