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ipv6: Use POSTDAD state

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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>
This commit is contained in:
Herbert Xu 2010-05-18 15:55:27 -07:00 • committed by David S. Miller
parent 4c5ff6a6fe
commit f2344a131b
1 changed files with 24 additions and 5 deletions
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29
net/ipv6/addrconf.c
View file

@ -1406,10 +1406,27 @@ static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
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 @@ static int addrconf_ifdown(struct net_device *dev, int how)
/* 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 @@ static void addrconf_dad_timer(unsigned long data)
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 @@ static void addrconf_dad_run(struct inet6_dev *idev)
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;
}
spin_unlock(&ifp->lock);
if (ifp->flags & IFA_F_TENTATIVE &&
ifp->state == INET6_IFADDR_STATE_DAD)
addrconf_dad_kick(ifp);
spin_unlock(&ifp->lock);
}
read_unlock_bh(&idev->lock);
}