[IPV6]: Run DAD when the link becomes ready.

If the link was not available when the interface was created,
run DAD for pending tentative addresses when the link becomes ready.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index d012f6ac7040..f6ead6a843e3 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -137,6 +137,7 @@ static int addrconf_ifdown(struct net_device *dev, int how);
 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 static void addrconf_dad_timer(unsigned long data);
 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
+static void addrconf_dad_run(struct inet6_dev *idev);
 static void addrconf_rs_timer(unsigned long data);
 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
@@ -418,6 +419,7 @@ static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
                 if ((idev = ipv6_add_dev(dev)) == NULL)
                         return NULL;
         }
+
         if (dev->flags&IFF_UP)
                 ipv6_mc_up(idev);
         return idev;
@@ -2140,6 +2142,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
 {
         struct net_device *dev = (struct net_device *) data;
         struct inet6_dev *idev = __in6_dev_get(dev);
+        int run_pending = 0;
 
         switch(event) {
         case NETDEV_UP:
@@ -2172,6 +2175,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
                                         "link becomes ready\n",
                                         dev->name);
 
+                        run_pending = 1;
                 }
 
                 switch(dev->type) {
@@ -2190,6 +2194,9 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
                         break;
                 };
                 if (idev) {
+                        if (run_pending)
+                                addrconf_dad_run(idev);
+
                         /* If the MTU changed during the interface down, when the
                            interface up, the changed MTU must be reflected in the
                            idev as well as routers.
@@ -2546,6 +2553,22 @@ static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
         }
 }
 
+static void addrconf_dad_run(struct inet6_dev *idev) {
+        struct inet6_ifaddr *ifp;
+
+        read_lock_bh(&idev->lock);
+        for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
+                spin_lock_bh(&ifp->lock);
+                if (!(ifp->flags & IFA_F_TENTATIVE)) {
+                        spin_unlock_bh(&ifp->lock);
+                        continue;
+                }
+                spin_unlock_bh(&ifp->lock);
+                addrconf_dad_kick(ifp);
+        }
+        read_unlock_bh(&idev->lock);
+}
+
 #ifdef CONFIG_PROC_FS
 struct if6_iter_state {
         int bucket;