Patchwork [v2,2/3] NFQUEUE: coalesce IPv4 and IPv6 hashing

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Submitter holger@eitzenberger.org
Date March 23, 2013, 8:04 p.m.
Message ID <20130323200608.174914056@eitzenberger.org>
Download mbox | patch
Permalink /patch/230345/
State Accepted
Headers show

Comments

holger@eitzenberger.org - March 23, 2013, 8:04 p.m.
Because rev1 and rev3 of the target share the same hashing
generalize it by introduing nfqueue_hash().

Signed-off-by: Holger Eitzenberger <holger@eitzenberger.org>


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Pablo Neira - April 1, 2013, 11:26 p.m.
On Sat, Mar 23, 2013 at 09:04:04PM +0100, Holger Eitzenberger wrote:
> Because rev1 and rev3 of the target share the same hashing
> generalize it by introduing nfqueue_hash().

Also applied, thanks.
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Patch

Index: net-next/net/netfilter/xt_NFQUEUE.c
===================================================================
--- net-next.orig/net/netfilter/xt_NFQUEUE.c	2013-03-23 19:01:11.000000000 +0100
+++ net-next/net/netfilter/xt_NFQUEUE.c	2013-03-23 20:54:54.000000000 +0100
@@ -76,22 +76,31 @@ 
 }
 #endif
 
-static unsigned int
-nfqueue_tg_v1(struct sk_buff *skb, const struct xt_action_param *par)
+static u32
+nfqueue_hash(const struct sk_buff *skb, const struct xt_action_param *par)
 {
 	const struct xt_NFQ_info_v1 *info = par->targinfo;
 	u32 queue = info->queuenum;
 
-	if (info->queues_total > 1) {
-		if (par->family == NFPROTO_IPV4)
-			queue = (((u64) hash_v4(skb) * info->queues_total) >>
-				 32) + queue;
+	if (par->family == NFPROTO_IPV4)
+		queue += ((u64) hash_v4(skb) * info->queues_total) >> 32;
 #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
-		else if (par->family == NFPROTO_IPV6)
-			queue = (((u64) hash_v6(skb) * info->queues_total) >>
-				 32) + queue;
+	else if (par->family == NFPROTO_IPV6)
+		queue += ((u64) hash_v6(skb) * info->queues_total) >> 32;
 #endif
-	}
+
+	return queue;
+}
+
+static unsigned int
+nfqueue_tg_v1(struct sk_buff *skb, const struct xt_action_param *par)
+{
+	const struct xt_NFQ_info_v1 *info = par->targinfo;
+	u32 queue = info->queuenum;
+
+	if (info->queues_total > 1)
+		queue = nfqueue_hash(skb, par);
+
 	return NF_QUEUE_NR(queue);
 }
 
@@ -144,17 +153,10 @@ 
 			int cpu = smp_processor_id();
 
 			queue = info->queuenum + cpu % info->queues_total;
-		} else {
-			if (par->family == NFPROTO_IPV4)
-				queue = (((u64) hash_v4(skb) * info->queues_total) >>
-						 32) + queue;
-#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
-			else if (par->family == NFPROTO_IPV6)
-				queue = (((u64) hash_v6(skb) * info->queues_total) >>
-						 32) + queue;
-#endif
-		}
+		} else
+			queue = nfqueue_hash(skb, par);
 	}
+
 	return NF_QUEUE_NR(queue);
 }