[PATCH 3.2 082/102] ipv6: reallocate addrconf router for ipv6 address when lo device up

[Ben Hutchings]

3.2.64-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: chenweilong <chenweilong@xxxxxxxxxx>

It fix the bug 67951 on bugzilla
https://bugzilla.kernel.org/show_bug.cgi?id=67951

The patch can't be applied directly, as it' used the function introduced
by "commit 94e187c0" ip6_rt_put(), that patch can't be applied directly
either.

====================

From: Gao feng <gaofeng@xxxxxxxxxxxxxx>

commit 33d99113b1102c2d2f8603b9ba72d89d915c13f5 upstream.

This commit don't have a stable tag, but it fix the bug
no reply after loopback down-up.It's very worthy to be
applied to stable 3.4 kernels.

The bug is 67951 on bugzilla
https://bugzilla.kernel.org/show_bug.cgi?id=67951


CC: Sabrina Dubroca <sd@xxxxxxxxxxxxxxx>
CC: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
Reported-by: Weilong Chen <chenweilong@xxxxxxxxxx>
Signed-off-by: Weilong Chen <chenweilong@xxxxxxxxxx>
Signed-off-by: Gao feng <gaofeng@xxxxxxxxxxxxxx>
Acked-by: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
[weilong: s/ip6_rt_put/dst_release]
Signed-off-by: Chen Weilong <chenweilong@xxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 net/ipv6/addrconf.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2443,8 +2443,18 @@ static void init_loopback(struct net_dev
 			if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
 				continue;
 
-			if (sp_ifa->rt)
-				continue;
+			if (sp_ifa->rt) {
+				/* This dst has been added to garbage list when
+				 * lo device down, release this obsolete dst and
+				 * reallocate a new router for ifa.
+				 */
+				if (sp_ifa->rt->dst.obsolete > 0) {
+					dst_release(&sp_ifa->rt->dst);
+					sp_ifa->rt = NULL;
+				} else {
+					continue;
+				}
+			}
 
 			sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
 

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