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-rw-r--r--net/ipv6/addrconf.c46
1 files changed, 29 insertions, 17 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 5f582f385ab..7a4bf767128 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2649,11 +2649,11 @@ static int addrconf_ifdown(struct net_device *dev, int how)
write_lock_bh(&addrconf_hash_lock);
while ((ifa = *bifa) != NULL) {
if (ifa->idev == idev &&
- (how || !(ifa->flags&IFA_F_PERMANENT))) {
+ (how || !(ifa->flags&IFA_F_PERMANENT) ||
+ ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
*bifa = ifa->lst_next;
ifa->lst_next = NULL;
- addrconf_del_timer(ifa);
- in6_ifa_put(ifa);
+ __in6_ifa_put(ifa);
continue;
}
bifa = &ifa->lst_next;
@@ -2691,28 +2691,40 @@ static int addrconf_ifdown(struct net_device *dev, int how)
#endif
bifa = &idev->addr_list;
while ((ifa = *bifa) != NULL) {
- if (how == 0 && (ifa->flags&IFA_F_PERMANENT)) {
- /* Retain permanent address on admin down */
+ addrconf_del_timer(ifa);
+
+ /* If just doing link down, and address is permanent
+ and not link-local, then retain it. */
+ if (how == 0 &&
+ (ifa->flags&IFA_F_PERMANENT) &&
+ !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
bifa = &ifa->if_next;
- /* Restart DAD if needed when link comes back up */
- if ( !((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
- idev->cnf.accept_dad <= 0 ||
- (ifa->flags & IFA_F_NODAD)))
- ifa->flags |= IFA_F_TENTATIVE;
+ /* If not doing DAD on this address, just keep it. */
+ if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
+ idev->cnf.accept_dad <= 0 ||
+ (ifa->flags & IFA_F_NODAD))
+ continue;
+
+ /* If it was tentative already, no need to notify */
+ if (ifa->flags & IFA_F_TENTATIVE)
+ continue;
+
+ /* Flag it for later restoration when link comes up */
+ ifa->flags |= IFA_F_TENTATIVE;
+ in6_ifa_hold(ifa);
} else {
*bifa = ifa->if_next;
ifa->if_next = NULL;
-
ifa->dead = 1;
- write_unlock_bh(&idev->lock);
+ }
+ write_unlock_bh(&idev->lock);
- __ipv6_ifa_notify(RTM_DELADDR, ifa);
- atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
- in6_ifa_put(ifa);
+ __ipv6_ifa_notify(RTM_DELADDR, ifa);
+ atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
+ in6_ifa_put(ifa);
- write_lock_bh(&idev->lock);
- }
+ write_lock_bh(&idev->lock);
}
write_unlock_bh(&idev->lock);