netfilter: nf_tables: Introduce functions freeing nft_hook objects

Pointless wrappers around kfree() for now, prep work for an embedded
list of nf_hook_ops.

Signed-off-by: Phil Sutter <[e-mail]>
Signed-off-by: Pablo Neira Ayuso <[e-mail]>

net/netfilter/nf_tables_api.c

···
 	return err;
 }
 
+static void nft_netdev_hook_free(struct nft_hook *hook)
+{
+	kfree(hook);
+}
+
+static void nft_netdev_hook_free_rcu(struct nft_hook *hook)
+{
+	kfree_rcu(hook, rcu);
+}
+
 static void nft_netdev_unregister_hooks(struct net *net,
 					struct list_head *hook_list,
 					bool release_netdev)
···
 		nf_unregister_net_hook(net, &hook->ops);
 		if (release_netdev) {
 			list_del(&hook->list);
-			kfree_rcu(hook, rcu);
+			nft_netdev_hook_free_rcu(hook);
 		}
 	}
 }
···
 			list_for_each_entry_safe(hook, next,
 						 &basechain->hook_list, list) {
 				list_del_rcu(&hook->list);
-				kfree_rcu(hook, rcu);
+				nft_netdev_hook_free_rcu(hook);
 			}
 		}
 		module_put(basechain->type->owner);
···
 		}
 		if (nft_hook_list_find(hook_list, hook)) {
 			NL_SET_BAD_ATTR(extack, tmp);
-			kfree(hook);
+			nft_netdev_hook_free(hook);
 			err = -EEXIST;
 			goto err_hook;
 		}
···
 err_hook:
 	list_for_each_entry_safe(hook, next, hook_list, list) {
 		list_del(&hook->list);
-		kfree(hook);
+		nft_netdev_hook_free(hook);
 	}
 	return err;
 }
···
 
 	list_for_each_entry_safe(h, next, &hook->list, list) {
 		list_del(&h->list);
-		kfree(h);
+		nft_netdev_hook_free(h);
 	}
 	module_put(hook->type->owner);
 }
···
 
 				if (nft_hook_list_find(&basechain->hook_list, h)) {
 					list_del(&h->list);
-					kfree(h);
+					nft_netdev_hook_free(h);
 				}
 			}
 		} else {
···
 			if (unregister)
 				nf_unregister_net_hook(ctx->net, &h->ops);
 			list_del(&h->list);
-			kfree_rcu(h, rcu);
+			nft_netdev_hook_free_rcu(h);
 		}
 		module_put(hook.type->owner);
 	}
···
 					    FLOW_BLOCK_UNBIND);
 		if (release_netdev) {
 			list_del(&hook->list);
-			kfree_rcu(hook, rcu);
+			nft_netdev_hook_free_rcu(hook);
 		}
 	}
 }
···
 
 		nft_unregister_flowtable_hook(net, flowtable, hook);
 		list_del_rcu(&hook->list);
-		kfree_rcu(hook, rcu);
+		nft_netdev_hook_free_rcu(hook);
 	}
 
 	return err;
···
 
 	list_for_each_entry_safe(hook, next, hook_list, list) {
 		list_del_rcu(&hook->list);
-		kfree_rcu(hook, rcu);
+		nft_netdev_hook_free_rcu(hook);
 	}
 }
 
···
 	list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
 		if (nft_hook_list_find(&flowtable->hook_list, hook)) {
 			list_del(&hook->list);
-			kfree(hook);
+			nft_netdev_hook_free(hook);
 		}
 	}
 
···
 		if (unregister)
 			nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
 		list_del_rcu(&hook->list);
-		kfree_rcu(hook, rcu);
+		nft_netdev_hook_free_rcu(hook);
 	}
 
 	return err;
···
 
 	list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
 		list_del(&this->list);
-		kfree(this);
+		nft_netdev_hook_free(this);
 	}
 }
 
···
 	flowtable->data.type->free(&flowtable->data);
 	list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
 		list_del_rcu(&hook->list);
-		kfree_rcu(hook, rcu);
+		nft_netdev_hook_free_rcu(hook);
 	}
 	kfree(flowtable->name);
 	module_put(flowtable->data.type->owner);