netfilter: pass 'nf_hook_ops' instead of 'list_head' to nf_queue()

Since 'list_for_each_continue_rcu' has already been replaced by
'list_for_each_entry_continue_rcu', pass 'list_head' to nf_queue() as a
parameter can not benefit us any more.

This patch will replace 'list_head' with 'nf_hook_ops' as the parameter of
nf_queue() and __nf_queue() to save code.
Signed-off-by: Michael Wang <wangyun@linux.vnet.ibm.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/core.c

@@ -189,8 +189,8 @@ int nf_hook_slow(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
 		if (ret == 0)
 			ret = -EPERM;
 	} else if ((verdict & NF_VERDICT_MASK) == NF_QUEUE) {
-		int err = nf_queue(skb, &elem->list, pf, hook, indev, outdev,
-					okfn, verdict >> NF_VERDICT_QBITS);
+		int err = nf_queue(skb, elem, pf, hook, indev, outdev, okfn,
+						verdict >> NF_VERDICT_QBITS);
 		if (err < 0) {
 			if (err == -ECANCELED)
 				goto next_hook;

net/netfilter/nf_internals.h

@@ -24,7 +24,7 @@ extern unsigned int nf_iterate(struct list_head *head,
 
 /* nf_queue.c */
 extern int nf_queue(struct sk_buff *skb,
-		    struct list_head *elem,
+		    struct nf_hook_ops *elem,
 		    u_int8_t pf, unsigned int hook,
 		    struct net_device *indev,
 		    struct net_device *outdev,

net/netfilter/nf_queue.c

@@ -118,7 +118,7 @@ static void nf_queue_entry_release_refs(struct nf_queue_entry *entry)
  * through nf_reinject().
  */
 static int __nf_queue(struct sk_buff *skb,
-		      struct list_head *elem,
+		      struct nf_hook_ops *elem,
 		      u_int8_t pf, unsigned int hook,
 		      struct net_device *indev,
 		      struct net_device *outdev,
@@ -155,7 +155,7 @@ static int __nf_queue(struct sk_buff *skb,
 
 	*entry = (struct nf_queue_entry) {
 		.skb	= skb,
-		.elem	= list_entry(elem, struct nf_hook_ops, list),
+		.elem	= elem,
 		.pf	= pf,
 		.hook	= hook,
 		.indev	= indev,
@@ -225,7 +225,7 @@ static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
 #endif
 
 int nf_queue(struct sk_buff *skb,
-	     struct list_head *elem,
+	     struct nf_hook_ops *elem,
 	     u_int8_t pf, unsigned int hook,
 	     struct net_device *indev,
 	     struct net_device *outdev,
@@ -323,7 +323,7 @@ void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict)
 		local_bh_enable();
 		break;
 	case NF_QUEUE:
-		err = __nf_queue(skb, &elem->list, entry->pf, entry->hook,
+		err = __nf_queue(skb, elem, entry->pf, entry->hook,
 				 entry->indev, entry->outdev, entry->okfn,
 				 verdict >> NF_VERDICT_QBITS);
 		if (err < 0) {