netfilter: nf_tables: Pass nf_hook_ops to nft_unregister_flowtable_hook()

The function accesses only the hook's ops field, pass it directly. This
prepares for nft_hooks holding a list of nf_hook_ops in future.

While at it, make use of the function in
__nft_unregister_flowtable_net_hooks() as well.

Signed-off-by: Phil Sutter <[email protected]>
Signed-off-by: Pablo Neira Ayuso <[email protected]>

Author: Phil Sutter

net/netfilter/nf_tables_api.c

@@ -8895,12 +8895,12 @@ nft_flowtable_type_get(struct net *net, u8 family)
 }
 
 /* Only called from error and netdev event paths. */
-static void nft_unregister_flowtable_hook(struct net *net,
-					  struct nft_flowtable *flowtable,
-					  struct nft_hook *hook)
+static void nft_unregister_flowtable_ops(struct net *net,
+					 struct nft_flowtable *flowtable,
+					 struct nf_hook_ops *ops)
 {
-	nf_unregister_net_hook(net, &hook->ops);
-	flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
+	nf_unregister_net_hook(net, ops);
+	flowtable->data.type->setup(&flowtable->data, ops->dev,
 				    FLOW_BLOCK_UNBIND);
 }
 
@@ -8912,9 +8912,7 @@ static void __nft_unregister_flowtable_net_hooks(struct net *net,
 	struct nft_hook *hook, *next;
 
 	list_for_each_entry_safe(hook, next, hook_list, list) {
-		nf_unregister_net_hook(net, &hook->ops);
-		flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
-					    FLOW_BLOCK_UNBIND);
+		nft_unregister_flowtable_ops(net, flowtable, &hook->ops);
 		if (release_netdev) {
 			list_del(&hook->list);
 			nft_netdev_hook_free_rcu(hook);
@@ -8983,7 +8981,7 @@ static int nft_register_flowtable_net_hooks(struct net *net,
 		if (i-- <= 0)
 			break;
 
-		nft_unregister_flowtable_hook(net, flowtable, hook);
+		nft_unregister_flowtable_ops(net, flowtable, &hook->ops);
 		list_del_rcu(&hook->list);
 		nft_netdev_hook_free_rcu(hook);
 	}
@@ -9066,7 +9064,7 @@ static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
 err_flowtable_update_hook:
 	list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
 		if (unregister)
-			nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
+			nft_unregister_flowtable_ops(ctx->net, flowtable, &hook->ops);
 		list_del_rcu(&hook->list);
 		nft_netdev_hook_free_rcu(hook);
 	}
@@ -9639,7 +9637,7 @@ static void nft_flowtable_event(unsigned long event, struct net_device *dev,
 			continue;
 
 		/* flow_offload_netdev_event() cleans up entries for us. */
-		nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
+		nft_unregister_flowtable_ops(dev_net(dev), flowtable, ops);
 		list_del_rcu(&hook->list);
 		kfree_rcu(hook, rcu);
 		break;