ipv6: Send unsolicited neighbour advertismements when notified
The NETDEV_NOTIFY_PEERS notifier is a request to send such
advertisements following migration to a different physical link,
e.g. virtual machine migration.
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index f057ff3..62cbd15 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -611,6 +611,29 @@
inc_opt ? ND_OPT_TARGET_LL_ADDR : 0);
}
+static void ndisc_send_unsol_na(struct net_device *dev)
+{
+ struct inet6_dev *idev;
+ struct inet6_ifaddr *ifa;
+ struct in6_addr mcaddr;
+
+ idev = in6_dev_get(dev);
+ if (!idev)
+ return;
+
+ read_lock_bh(&idev->lock);
+ list_for_each_entry(ifa, &idev->addr_list, if_list) {
+ addrconf_addr_solict_mult(&ifa->addr, &mcaddr);
+ ndisc_send_na(dev, NULL, &mcaddr, &ifa->addr,
+ /*router=*/ !!idev->cnf.forwarding,
+ /*solicited=*/ false, /*override=*/ true,
+ /*inc_opt=*/ true);
+ }
+ read_unlock_bh(&idev->lock);
+
+ in6_dev_put(idev);
+}
+
void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
const struct in6_addr *solicit,
const struct in6_addr *daddr, const struct in6_addr *saddr)
@@ -1723,6 +1746,9 @@
neigh_ifdown(&nd_tbl, dev);
fib6_run_gc(~0UL, net);
break;
+ case NETDEV_NOTIFY_PEERS:
+ ndisc_send_unsol_na(dev);
+ break;
default:
break;
}