arp: Do not perturb drop profiles with ignored ARP packets

We do not wish to disturb dropwatch or perf drop profiles with an ARP
we will ignore.

Signed-off-by: Rick Jones <rick.jones2@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 1 deletions

diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 1a9b99e04465..16acb59d665e 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -953,10 +953,11 @@ static int arp_rcv(struct sk_buff *skb, struct net_device *dev,
 {
         const struct arphdr *arp;
 
+        /* do not tweak dropwatch on an ARP we will ignore */
         if (dev->flags & IFF_NOARP ||
             skb->pkt_type == PACKET_OTHERHOST ||
             skb->pkt_type == PACKET_LOOPBACK)
-                goto freeskb;
+                goto consumeskb;
 
         skb = skb_share_check(skb, GFP_ATOMIC);
         if (!skb)
@@ -974,6 +975,9 @@ static int arp_rcv(struct sk_buff *skb, struct net_device *dev,
 
         return NF_HOOK(NFPROTO_ARP, NF_ARP_IN, skb, dev, NULL, arp_process);
 
+consumeskb:
+        consume_skb(skb);
+        return 0;
 freeskb:
         kfree_skb(skb);
 out_of_mem: