netfilter: xt_NFQUEUE: coalesce IPv4 and IPv6 hashing
holger@eitzenberger.org [Sat, 23 Mar 2013 10:04:04 +0000 (10:04 +0000)]
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>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/xt_NFQUEUE.c

index a287ef2..1e2fae3 100644 (file)
@@ -76,22 +76,31 @@ static u32 hash_v6(const struct sk_buff *skb)
 }
 #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 @@ nfqueue_tg_v3(struct sk_buff *skb, const struct xt_action_param *par)
                        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);
 }