netfilter: nft_objref: make it builtin

nft_objref is needed to reference named objects, it makes
no sense to disable it.

Before:
   text	   data	    bss	    dec	 filename
  4014	    424	      0	   4438	 nft_objref.o
  4174	   1128	      0	   5302	 nft_objref.ko
359351	  15276	    864	 375491	 nf_tables.ko
After:
  text	   data	    bss	    dec	 filename
  3815	    408	      0	   4223	 nft_objref.o
363161	  15692	    864	 379717	 nf_tables.ko

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

include/net/netfilter/nf_tables_core.h

@@ -18,6 +18,7 @@ extern struct nft_expr_type nft_meta_type;
 extern struct nft_expr_type nft_rt_type;
 extern struct nft_expr_type nft_exthdr_type;
 extern struct nft_expr_type nft_last_type;
+extern struct nft_expr_type nft_objref_type;
 
 #ifdef CONFIG_NETWORK_SECMARK
 extern struct nft_object_type nft_secmark_obj_type;

net/netfilter/Kconfig

@@ -568,12 +568,6 @@ config NFT_TUNNEL
 	  This option adds the "tunnel" expression that you can use to set
 	  tunneling policies.
 
-config NFT_OBJREF
-	tristate "Netfilter nf_tables stateful object reference module"
-	help
-	  This option adds the "objref" expression that allows you to refer to
-	  stateful objects, such as counters and quotas.
-
 config NFT_QUEUE
 	depends on NETFILTER_NETLINK_QUEUE
 	tristate "Netfilter nf_tables queue module"

net/netfilter/Makefile

@@ -86,7 +86,8 @@ nf_tables-objs := nf_tables_core.o nf_tables_api.o nft_chain_filter.o \
 		  nf_tables_trace.o nft_immediate.o nft_cmp.o nft_range.o \
 		  nft_bitwise.o nft_byteorder.o nft_payload.o nft_lookup.o \
 		  nft_dynset.o nft_meta.o nft_rt.o nft_exthdr.o nft_last.o \
-		  nft_counter.o nft_chain_route.o nf_tables_offload.o \
+		  nft_counter.o nft_objref.o \
+		  nft_chain_route.o nf_tables_offload.o \
 		  nft_set_hash.o nft_set_bitmap.o nft_set_rbtree.o \
 		  nft_set_pipapo.o
 
@@ -104,7 +105,6 @@ obj-$(CONFIG_NFT_CT)		+= nft_ct.o
 obj-$(CONFIG_NFT_FLOW_OFFLOAD)	+= nft_flow_offload.o
 obj-$(CONFIG_NFT_LIMIT)		+= nft_limit.o
 obj-$(CONFIG_NFT_NAT)		+= nft_nat.o
-obj-$(CONFIG_NFT_OBJREF)	+= nft_objref.o
 obj-$(CONFIG_NFT_QUEUE)		+= nft_queue.o
 obj-$(CONFIG_NFT_QUOTA)		+= nft_quota.o
 obj-$(CONFIG_NFT_REJECT) 	+= nft_reject.o

net/netfilter/nf_tables_core.c

@@ -340,6 +340,7 @@ static struct nft_expr_type *nft_basic_types[] = {
 	&nft_exthdr_type,
 	&nft_last_type,
 	&nft_counter_type,
+	&nft_objref_type,
 };
 
 static struct nft_object_type *nft_basic_objects[] = {

net/netfilter/nft_objref.c

@@ -82,7 +82,6 @@ static void nft_objref_activate(const struct nft_ctx *ctx,
 	obj->use++;
 }
 
-static struct nft_expr_type nft_objref_type;
 static const struct nft_expr_ops nft_objref_ops = {
 	.type		= &nft_objref_type,
 	.size		= NFT_EXPR_SIZE(sizeof(struct nft_object *)),
@@ -195,7 +194,6 @@ static void nft_objref_map_destroy(const struct nft_ctx *ctx,
 	nf_tables_destroy_set(ctx, priv->set);
 }
 
-static struct nft_expr_type nft_objref_type;
 static const struct nft_expr_ops nft_objref_map_ops = {
 	.type		= &nft_objref_type,
 	.size		= NFT_EXPR_SIZE(sizeof(struct nft_objref_map)),
@@ -233,28 +231,10 @@ static const struct nla_policy nft_objref_policy[NFTA_OBJREF_MAX + 1] = {
 	[NFTA_OBJREF_SET_ID]	= { .type = NLA_U32 },
 };
 
-static struct nft_expr_type nft_objref_type __read_mostly = {
+struct nft_expr_type nft_objref_type __read_mostly = {
 	.name		= "objref",
 	.select_ops	= nft_objref_select_ops,
 	.policy		= nft_objref_policy,
 	.maxattr	= NFTA_OBJREF_MAX,
 	.owner		= THIS_MODULE,
 };
-
-static int __init nft_objref_module_init(void)
-{
-	return nft_register_expr(&nft_objref_type);
-}
-
-static void __exit nft_objref_module_exit(void)
-{
-	nft_unregister_expr(&nft_objref_type);
-}
-
-module_init(nft_objref_module_init);
-module_exit(nft_objref_module_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
-MODULE_ALIAS_NFT_EXPR("objref");
-MODULE_DESCRIPTION("nftables stateful object reference module");