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authorDavid Ahern <dsahern@gmail.com>2018-10-12 06:33:49 +0300
committerDavid S. Miller <davem@davemloft.net>2018-10-12 19:47:39 +0300
commit859bd2ef1fc1110a8031b967ee656c53a6260a76 (patch)
tree96f07d4fb9cc3ec82e5b60dd1aae6976aa87ead3 /net/ipv6/ndisc.c
parent7c6bb7d2faaf1ed7d78bafd712476e4cf2cf0d7d (diff)
downloadlinux-859bd2ef1fc1110a8031b967ee656c53a6260a76.tar.xz
net: Evict neighbor entries on carrier down
When a link's carrier goes down it could be a sign of the port changing networks. If the new network has overlapping addresses with the old one, then the kernel will continue trying to use neighbor entries established based on the old network until the entries finally age out - meaning a potentially long delay with communications not working. This patch evicts neighbor entries on carrier down with the exception of those marked permanent. Permanent entries are managed by userspace (either an admin or a routing daemon such as FRR). Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ndisc.c')
-rw-r--r--net/ipv6/ndisc.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 51863ada15a4..a25cfdd47c89 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1784,6 +1784,8 @@ static int ndisc_netdev_event(struct notifier_block *this, unsigned long event,
change_info = ptr;
if (change_info->flags_changed & IFF_NOARP)
neigh_changeaddr(&nd_tbl, dev);
+ if (!netif_carrier_ok(dev))
+ neigh_carrier_down(&nd_tbl, dev);
break;
case NETDEV_DOWN:
neigh_ifdown(&nd_tbl, dev);