ipv6: Use POSTDAD state
This patch makes use of the new POSTDAD state. This prevents
a race between DAD completion and failure.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 2e42162..7c769fa 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1406,10 +1406,27 @@
ipv6_del_addr(ifp);
}
+static int addrconf_dad_end(struct inet6_ifaddr *ifp)
+{
+ int err = -ENOENT;
+
+ spin_lock(&ifp->state_lock);
+ if (ifp->state == INET6_IFADDR_STATE_DAD) {
+ ifp->state = INET6_IFADDR_STATE_POSTDAD;
+ err = 0;
+ }
+ spin_unlock(&ifp->state_lock);
+
+ return err;
+}
+
void addrconf_dad_failure(struct inet6_ifaddr *ifp)
{
struct inet6_dev *idev = ifp->idev;
+ if (addrconf_dad_end(ifp))
+ return;
+
if (net_ratelimit())
printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
ifp->idev->dev->name, &ifp->addr);
@@ -2712,6 +2729,7 @@
/* Flag it for later restoration when link comes up */
ifa->flags |= IFA_F_TENTATIVE;
+ ifa->state = INET6_IFADDR_STATE_DAD;
write_unlock_bh(&idev->lock);
@@ -2883,6 +2901,9 @@
struct inet6_dev *idev = ifp->idev;
struct in6_addr mcaddr;
+ if (!ifp->probes && addrconf_dad_end(ifp))
+ goto out;
+
read_lock(&idev->lock);
if (idev->dead || !(idev->if_flags & IF_READY)) {
read_unlock(&idev->lock);
@@ -2956,12 +2977,10 @@
read_lock_bh(&idev->lock);
list_for_each_entry(ifp, &idev->addr_list, if_list) {
spin_lock(&ifp->lock);
- if (!(ifp->flags & IFA_F_TENTATIVE)) {
- spin_unlock(&ifp->lock);
- continue;
- }
+ if (ifp->flags & IFA_F_TENTATIVE &&
+ ifp->state == INET6_IFADDR_STATE_DAD)
+ addrconf_dad_kick(ifp);
spin_unlock(&ifp->lock);
- addrconf_dad_kick(ifp);
}
read_unlock_bh(&idev->lock);
}