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IPv6: keep permanent addresses on admin down

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Permanent IPV6 addresses should not be removed when the link is
set to admin down, only when device is removed.

When link is lost permanent addresses should be marked as tentative
so that when link comes back they are subject to duplicate address
detection (if DAD was enabled for that address).

Other routing systems keep manually configured IPv6 addresses
when link is set down.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2010-02-08 19:48:05 +00:00 committed by David S. Miller
parent c0ad98453f
commit dc2b99f71e
1 changed files with 24 additions and 11 deletions
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35
net/ipv6/addrconf.c
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@ -2646,7 +2646,8 @@ static int addrconf_ifdown(struct net_device *dev, int how)
write_lock_bh(&addrconf_hash_lock);
while ((ifa = *bifa) != NULL) {
if (ifa->idev == idev) {
if (ifa->idev == idev &&
(how || !(ifa->flags&IFA_F_PERMANENT))) {
*bifa = ifa->lst_next;
ifa->lst_next = NULL;
addrconf_del_timer(ifa);
@ -2686,18 +2687,30 @@ static int addrconf_ifdown(struct net_device *dev, int how)
write_lock_bh(&idev->lock);
}
#endif
while ((ifa = idev->addr_list) != NULL) {
idev->addr_list = ifa->if_next;
ifa->if_next = NULL;
ifa->dead = 1;
addrconf_del_timer(ifa);
write_unlock_bh(&idev->lock);
bifa = &idev->addr_list;
while ((ifa = *bifa) != NULL) {
if (how == 0 && (ifa->flags&IFA_F_PERMANENT)) {
/* Retain permanent address on admin down */
bifa = &ifa->if_next;
__ipv6_ifa_notify(RTM_DELADDR, ifa);
atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
in6_ifa_put(ifa);
/* 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;
} else {
*bifa = ifa->if_next;
ifa->if_next = NULL;
write_lock_bh(&idev->lock);
ifa->dead = 1;
write_unlock_bh(&idev->lock);
__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_unlock_bh(&idev->lock);