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| author | Jeff Dike <jdike@akamai.com> | 2020-11-12 20:58:15 -0500 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2020-11-13 14:24:39 -0800 |
| commit | 8cf8821e15cd553339a5b48ee555a0439c2b2742 (patch) | |
| tree | 13666363e35caf4ee8c97d7f765d55ea9062f32d /include/net/neighbour.h | |
| parent | 2b5668733050fca85f0ab458c5b91732f9496a38 (diff) | |
| download | linux-8cf8821e15cd553339a5b48ee555a0439c2b2742.tar.gz linux-8cf8821e15cd553339a5b48ee555a0439c2b2742.tar.bz2 linux-8cf8821e15cd553339a5b48ee555a0439c2b2742.zip | |
net: Exempt multicast addresses from five-second neighbor lifetime
Commit 58956317c8de ("neighbor: Improve garbage collection")
guarantees neighbour table entries a five-second lifetime. Processes
which make heavy use of multicast can fill the neighour table with
multicast addresses in five seconds. At that point, neighbour entries
can't be GC-ed because they aren't five seconds old yet, the kernel
log starts to fill up with "neighbor table overflow!" messages, and
sends start to fail.
This patch allows multicast addresses to be thrown out before they've
lived out their five seconds. This makes room for non-multicast
addresses and makes messages to all addresses more reliable in these
circumstances.
Fixes: 58956317c8de ("neighbor: Improve garbage collection")
Signed-off-by: Jeff Dike <jdike@akamai.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20201113015815.31397-1-jdike@akamai.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/net/neighbour.h')
| -rw-r--r-- | include/net/neighbour.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/neighbour.h b/include/net/neighbour.h index 81ee17594c32..22ced1381ede 100644 --- a/include/net/neighbour.h +++ b/include/net/neighbour.h @@ -204,6 +204,7 @@ struct neigh_table { int (*pconstructor)(struct pneigh_entry *); void (*pdestructor)(struct pneigh_entry *); void (*proxy_redo)(struct sk_buff *skb); + int (*is_multicast)(const void *pkey); bool (*allow_add)(const struct net_device *dev, struct netlink_ext_ack *extack); char *id; |