netfilter: arp_tables: allow use of arpt_do_table as hookfn

This is possible now that the xt_table structure is passed in via *priv.

Signed-off-by: Florian Westphal <[e-mail]>
Signed-off-by: Pablo Neira Ayuso <[e-mail]>

include/linux/netfilter_arp/arp_tables.h

···
 			const struct nf_hook_ops *ops);
 void arpt_unregister_table(struct net *net, const char *name);
 void arpt_unregister_table_pre_exit(struct net *net, const char *name);
-extern unsigned int arpt_do_table(struct sk_buff *skb,
-				  const struct nf_hook_state *state,
-				  struct xt_table *table);
+extern unsigned int arpt_do_table(void *priv, struct sk_buff *skb,
+				  const struct nf_hook_state *state);
 
 #ifdef CONFIG_NETFILTER_XTABLES_COMPAT
 #include <net/compat.h>

net/ipv4/netfilter/arp_tables.c

···
 	return (void *)entry + entry->next_offset;
 }
 
-unsigned int arpt_do_table(struct sk_buff *skb,
-			   const struct nf_hook_state *state,
-			   struct xt_table *table)
+unsigned int arpt_do_table(void *priv,
+			   struct sk_buff *skb,
+			   const struct nf_hook_state *state)
 {
+	const struct xt_table *table = priv;
 	unsigned int hook = state->hook;
 	static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
 	unsigned int verdict = NF_DROP;

net/ipv4/netfilter/arptable_filter.c

···
 	.priority	= NF_IP_PRI_FILTER,
 };
 
-/* The work comes in here from netfilter.c */
-static unsigned int
-arptable_filter_hook(void *priv, struct sk_buff *skb,
-		     const struct nf_hook_state *state)
-{
-	return arpt_do_table(skb, state, priv);
-}
-
 static struct nf_hook_ops *arpfilter_ops __read_mostly;
 
 static int arptable_filter_table_init(struct net *net)
···
 	if (ret < 0)
 		return ret;
 
-	arpfilter_ops = xt_hook_ops_alloc(&packet_filter, arptable_filter_hook);
+	arpfilter_ops = xt_hook_ops_alloc(&packet_filter, arpt_do_table);
 	if (IS_ERR(arpfilter_ops)) {
 		xt_unregister_template(&packet_filter);
 		return PTR_ERR(arpfilter_ops);