commit 2127d95aef6c795c3bd8b805722c5c46e8fe45dd
author Ido Schimmel <idosch@mellanox.com> Sun Jan 07 12:45:03 2018 +0200
committer David S. Miller <davem@davemloft.net> Sun Jan 07 21:29:39 2018 -0500
tree 58c813e1f7f40d6b06b2522adaf35077077f7790
parent 2b2413610ef6fc9df9ad003b02fecc3a8057231e

ipv6: Clear nexthop flags upon netdev up

Previous patch marked nexthops with the 'dead' and 'linkdown' flags.
Clear these flags when the netdev comes back up.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/ip6_route.h

diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 18e442e..caad391 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -169,6 +169,7 @@ void rt6_ifdown(struct net *net, struct net_device *dev);
 void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
+void rt6_sync_up(struct net_device *dev, unsigned int nh_flags);
 
 static inline const struct rt6_info *skb_rt6_info(const struct sk_buff *skb)
 {

net/ipv6/addrconf.c

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index ed06b11..b640556 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3484,6 +3484,9 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
 			if (run_pending)
 				addrconf_dad_run(idev);
 
+			/* Device has an address by now */
+			rt6_sync_up(dev, RTNH_F_DEAD);
+
 			/*
 			 * If the MTU changed during the interface down,
 			 * when the interface up, the changed MTU must be

net/ipv6/route.c

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index f5eda0a..4796d87 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -3459,6 +3459,35 @@ void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
 	fib6_clean_all(net, fib6_clean_tohost, gateway);
 }
 
+struct arg_netdev_event {
+	const struct net_device *dev;
+	unsigned int nh_flags;
+};
+
+static int fib6_ifup(struct rt6_info *rt, void *p_arg)
+{
+	const struct arg_netdev_event *arg = p_arg;
+	const struct net *net = dev_net(arg->dev);
+
+	if (rt != net->ipv6.ip6_null_entry && rt->dst.dev == arg->dev)
+		rt->rt6i_nh_flags &= ~arg->nh_flags;
+
+	return 0;
+}
+
+void rt6_sync_up(struct net_device *dev, unsigned int nh_flags)
+{
+	struct arg_netdev_event arg = {
+		.dev = dev,
+		.nh_flags = nh_flags,
+	};
+
+	if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev))
+		arg.nh_flags |= RTNH_F_LINKDOWN;
+
+	fib6_clean_all(dev_net(dev), fib6_ifup, &arg);
+}
+
 struct arg_dev_net {
 	struct net_device *dev;
 	struct net *net;