ipv6: reallocate addrconf router for ipv6 address when lo, device up

Hi David,

Please queue this for 3.4 stable kernel.

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 <[email protected]>

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

---
 net/ipv6/addrconf.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

index abfa007..25399bf 100644
@@ -2435,8 +2435,18 @@ static void init_loopback(struct net_device *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);
+					sp_ifa->rt = NULL;
+				} else {
+					continue;
+				}
+			}
 
 			sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
 

-- 1.7.12