summaryrefslogtreecommitdiff
path: root/include/net
diff options
context:
space:
mode:
authorJim Westfall <jwestfall@surrealistic.net>2018-01-14 04:18:51 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-01-31 12:55:55 +0100
commit260eb694b5a4bd3424a7c445128fb5a784e95e3d (patch)
tree0c38502f2ba68b3e8d52199a59062d654ba320ae /include/net
parent014510b11781c7ba17b4e2c25720ce15233c712f (diff)
ipv4: Make neigh lookup keys for loopback/point-to-point devices be INADDR_ANY
[ Upstream commit cd9ff4de0107c65d69d02253bb25d6db93c3dbc1 ] Map all lookup neigh keys to INADDR_ANY for loopback/point-to-point devices to avoid making an entry for every remote ip the device needs to talk to. This used the be the old behavior but became broken in a263b3093641f (ipv4: Make neigh lookups directly in output packet path) and later removed in 0bb4087cbec0 (ipv4: Fix neigh lookup keying over loopback/point-to-point devices) because it was broken. Signed-off-by: Jim Westfall <jwestfall@surrealistic.net> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/arp.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/net/arp.h b/include/net/arp.h
index 5e0f891d476c..1b3f86981757 100644
--- a/include/net/arp.h
+++ b/include/net/arp.h
@@ -19,6 +19,9 @@ static inline u32 arp_hashfn(const void *pkey, const struct net_device *dev, u32
static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key)
{
+ if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))
+ key = INADDR_ANY;
+
return ___neigh_lookup_noref(&arp_tbl, neigh_key_eq32, arp_hashfn, &key, dev);
}