diff options
| author |   David Ahern <dsahern@gmail.com> | 2018-10-11 20:33:49 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-10-12 09:47:39 -0700 |
| commit | 859bd2ef1fc1110a8031b967ee656c53a6260a76 (patch) | |
| tree | 96f07d4fb9cc3ec82e5b60dd1aae6976aa87ead3 /net/ipv4 | |
| parent | net/ipv6: Add knob to skip DELROUTE message on device down (diff) | |
| download | linux-dev-859bd2ef1fc1110a8031b967ee656c53a6260a76.tar.xz linux-dev-859bd2ef1fc1110a8031b967ee656c53a6260a76.zip | |
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/ipv4')
| -rw-r--r-- | net/ipv4/arp.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c index e90c89ef8c08..850a6f13a082 100644 --- a/net/ipv4/arp.c +++ b/net/ipv4/arp.c @@ -1255,6 +1255,8 @@ static int arp_netdev_event(struct notifier_block *this, unsigned long event, change_info = ptr; if (change_info->flags_changed & IFF_NOARP) neigh_changeaddr(&arp_tbl, dev); + if (!netif_carrier_ok(dev)) + neigh_carrier_down(&arp_tbl, dev); break; default: break; |