[PATCH 3.18 52/52] ipv4: Make neigh lookup keys for loopback/point-to-point devices be INADDR_ANY

[Greg Kroah-Hartman]

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jim Westfall <jwestfall@xxxxxxxxxxxxxxxx>


[ 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@xxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 include/net/arp.h |    3 +++
 net/ipv4/arp.c    |    7 ++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

--- a/include/net/arp.h
+++ b/include/net/arp.h
@@ -37,6 +37,9 @@ static inline struct neighbour *__ipv4_n
 {
 	struct neighbour *n;
 
+	if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))
+		key = INADDR_ANY;
+
 	rcu_read_lock_bh();
 	n = __ipv4_neigh_lookup_noref(dev, key);
 	if (n && !atomic_inc_not_zero(&n->refcnt))
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -221,11 +221,16 @@ static u32 arp_hash(const void *pkey,
 
 static int arp_constructor(struct neighbour *neigh)
 {
-	__be32 addr = *(__be32 *)neigh->primary_key;
+	__be32 addr;
 	struct net_device *dev = neigh->dev;
 	struct in_device *in_dev;
 	struct neigh_parms *parms;
+	u32 inaddr_any = INADDR_ANY;
 
+	if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))
+		memcpy(neigh->primary_key, &inaddr_any, arp_tbl.key_len);
+
+	addr = *(__be32 *)neigh->primary_key;
 	rcu_read_lock();
 	in_dev = __in_dev_get_rcu(dev);
 	if (in_dev == NULL) {