netfilter: nf_tables_offload: move indirect flow_block callback logic to core

Add nft_offload_init() and nft_offload_exit() function to deal with the
init and the exit path of the offload infrastructure.

Rename nft_indr_block_get_and_ing_cmd() to nft_indr_block_cb().
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

include/net/netfilter/nf_tables_offload.h

@@ -64,10 +64,6 @@ struct nft_rule;
 struct nft_flow_rule *nft_flow_rule_create(const struct nft_rule *rule);
 void nft_flow_rule_destroy(struct nft_flow_rule *flow);
 int nft_flow_rule_offload_commit(struct net *net);
-void nft_indr_block_get_and_ing_cmd(struct net_device *dev,
-				    flow_indr_block_bind_cb_t *cb,
-				    void *cb_priv,
-				    enum flow_block_command command);
 
 #define NFT_OFFLOAD_MATCH(__key, __base, __field, __len, __reg)		\
 	(__reg)->base_offset	=					\
@@ -80,4 +76,7 @@ void nft_indr_block_get_and_ing_cmd(struct net_device *dev,
 
 int nft_chain_offload_priority(struct nft_base_chain *basechain);
 
+void nft_offload_init(void);
+void nft_offload_exit(void);
+
 #endif

net/netfilter/nf_tables_api.c

@@ -7669,11 +7669,6 @@ static struct pernet_operations nf_tables_net_ops = {
 	.exit	= nf_tables_exit_net,
 };
 
-static struct flow_indr_block_ing_entry block_ing_entry = {
-	.cb = nft_indr_block_get_and_ing_cmd,
-	.list = LIST_HEAD_INIT(block_ing_entry.list),
-};
-
 static int __init nf_tables_module_init(void)
 {
 	int err;
@@ -7705,7 +7700,8 @@ static int __init nf_tables_module_init(void)
 		goto err5;
 
 	nft_chain_route_init();
-	flow_indr_add_block_ing_cb(&block_ing_entry);
+	nft_offload_init();
+
 	return err;
 err5:
 	rhltable_destroy(&nft_objname_ht);
@@ -7722,7 +7718,7 @@ static int __init nf_tables_module_init(void)
 
 static void __exit nf_tables_module_exit(void)
 {
-	flow_indr_del_block_ing_cb(&block_ing_entry);
+	nft_offload_exit();
 	nfnetlink_subsys_unregister(&nf_tables_subsys);
 	unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
 	nft_chain_filter_fini();

net/netfilter/nf_tables_offload.c

@@ -354,10 +354,9 @@ int nft_flow_rule_offload_commit(struct net *net)
 	return err;
 }
 
-void nft_indr_block_get_and_ing_cmd(struct net_device *dev,
-				    flow_indr_block_bind_cb_t *cb,
-				    void *cb_priv,
-				    enum flow_block_command command)
+static void nft_indr_block_cb(struct net_device *dev,
+			      flow_indr_block_bind_cb_t *cb, void *cb_priv,
+			      enum flow_block_command command)
 {
 	struct net *net = dev_net(dev);
 	const struct nft_table *table;
@@ -383,3 +382,18 @@ void nft_indr_block_get_and_ing_cmd(struct net_device *dev,
 		}
 	}
 }
+
+static struct flow_indr_block_ing_entry block_ing_entry = {
+	.cb	= nft_indr_block_cb,
+	.list	= LIST_HEAD_INIT(block_ing_entry.list),
+};
+
+void nft_offload_init(void)
+{
+	flow_indr_add_block_ing_cb(&block_ing_entry);
+}
+
+void nft_offload_exit(void)
+{
+	flow_indr_del_block_ing_cb(&block_ing_entry);
+}