netdev - [PATCH] net: ingress filter message limit

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Date:	Sat, 31 Jul 2010 12:13:16 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	David Miller <davem@...emloft.net>, jamal <hadi@...erus.ca>
Cc:	netdev@...r.kernel.org
Subject: [PATCH] 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@...tta.com>


--- a/net/core/dev.c	2010-07-31 12:08:00.808476717 -0700
+++ b/net/core/dev.c	2010-07-31 12:09:32.488882593 -0700
@@ -2646,10 +2646,10 @@ static int ing_filter(struct sk_buff *sk
 	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;
 	}
 
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