Commit 7f49e7a3 authored Dec 10, 2015 by David Ahern Committed by David S. Miller Dec 13, 2015

net: Flush local routes when device changes vrf association



The VRF driver cycles netdevs when an interface is enslaved or released:
the down event is used to flush neighbor and route tables and the up
event (if the interface was already up) effectively moves local and
connected routes to the proper table.

As of 4f823def the local route is left hanging around after a link
down, so when a netdev is moved from one VRF to another (or released
from a VRF altogether) local routes are left in the wrong table.

Fix by handling the NETDEV_CHANGEUPPER event. When the upper dev is
an L3mdev then call fib_disable_ip to flush all routes, local ones
to.

Fixes: 4f823def ("ipv4: fix to not remove local route on link down")
Cc: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 98900a80

net/ipv4/fib_frontend.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -1155,6 +1155,7 @@ static int fib_inetaddr_event(struct notifier_block *this, unsigned long event,
		static int fib_netdev_event(struct notifier_block this, unsigned long event, void ptr)
		{
		struct net_device *dev = netdev_notifier_info_to_dev(ptr);
		struct netdev_notifier_changeupper_info *info;
		struct in_device *in_dev;
		struct net *net = dev_net(dev);
		unsigned int flags;
		@@ -1193,6 +1194,14 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo
		case NETDEV_CHANGEMTU:
		rt_cache_flush(net);
		break;
		case NETDEV_CHANGEUPPER:
		info = ptr;
		/* flush all routes if dev is linked to or unlinked from
		* an L3 master device (e.g., VRF)
		*/
		if (info->upper_dev && netif_is_l3_master(info->upper_dev))
		fib_disable_ip(dev, NETDEV_DOWN, true);
		break;
		}
		return NOTIFY_DONE;
		}

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