ipv6: Send netlink notification when DAD fails

If we are managing IPv6 addresses using DHCP, it would be nice
for user-space to be notified if an address configured through
DHCP fails DAD.  Otherwise user-space would have to poll to see
whether DAD succeeds.

This patch uses the existing notification mechanism and simply
hooks it into the DAD failure code path.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 6cf3ee14ace3..3381b4317c27 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1380,6 +1380,8 @@ static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
                 if (dad_failed)
                         ifp->flags |= IFA_F_DADFAILED;
                 spin_unlock_bh(&ifp->lock);
+                if (dad_failed)
+                        ipv6_ifa_notify(0, ifp);
                 in6_ifa_put(ifp);
 #ifdef CONFIG_IPV6_PRIVACY
         } else if (ifp->flags&IFA_F_TEMPORARY) {