net: ingress filter message limit

If user misconfigures ingress and causes a redirection loop, don't
overwhelm the log.  This is also a error case so make it unlikely.
Found by inspection, luckily not in real system.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 4 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index b74fcd3e9365..5d1282df2fe3 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2646,10 +2646,10 @@ static int ing_filter(struct sk_buff *skb)
         int result = TC_ACT_OK;
         struct Qdisc *q;
 
-        if (MAX_RED_LOOP < ttl++) {
-                printk(KERN_WARNING
-                       "Redir loop detected Dropping packet (%d->%d)\n",
-                       skb->skb_iif, dev->ifindex);
+        if (unlikely(MAX_RED_LOOP < ttl++)) {
+                if (net_ratelimit())
+                        pr_warning( "Redir loop detected Dropping packet (%d->%d)\n",
+                               skb->skb_iif, dev->ifindex);
                 return TC_ACT_SHOT;
         }