netfilter: nf_tables: make all set structs const

They do not need to be writeable anymore.

v2: remove left-over __read_mostly annotation in set_pipapo.c (Stefano)

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

include/net/netfilter/nf_tables.h

···
  *      struct nft_set_type - nf_tables set type
  *
  *      @ops: set ops for this type
- *      @list: used internally
- *      @owner: module reference
  *      @features: features supported by the implementation
  */
 struct nft_set_type {
 	const struct nft_set_ops	ops;
-	struct list_head		list;
-	struct module			*owner;
 	u32				features;
 };
 #define to_set_type(o) container_of(o, struct nft_set_type, ops)

include/net/netfilter/nf_tables_core.h

···
 extern struct static_key_false nft_counters_enabled;
 extern struct static_key_false nft_trace_enabled;
 
-extern struct nft_set_type nft_set_rhash_type;
-extern struct nft_set_type nft_set_hash_type;
-extern struct nft_set_type nft_set_hash_fast_type;
-extern struct nft_set_type nft_set_rbtree_type;
-extern struct nft_set_type nft_set_bitmap_type;
-extern struct nft_set_type nft_set_pipapo_type;
+extern const struct nft_set_type nft_set_rhash_type;
+extern const struct nft_set_type nft_set_hash_type;
+extern const struct nft_set_type nft_set_hash_fast_type;
+extern const struct nft_set_type nft_set_rbtree_type;
+extern const struct nft_set_type nft_set_bitmap_type;
+extern const struct nft_set_type nft_set_pipapo_type;
 
 struct nft_expr;
 struct nft_regs;

net/netfilter/nf_tables_api.c

···
 			break;
 		}
 
-		if (!try_module_get(type->owner))
-			continue;
-		if (bops != NULL)
-			module_put(to_set_type(bops)->owner);
-
 		bops = ops;
 		best = est;
 	}
···
 		size = ops->privsize(nla, &desc);
 
 	set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
-	if (!set) {
-		err = -ENOMEM;
-		goto err1;
-	}
+	if (!set)
+		return -ENOMEM;
 
 	name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
 	if (!name) {
···
 	kfree(set->name);
 err2:
 	kvfree(set);
-err1:
-	module_put(to_set_type(ops)->owner);
 	return err;
 }
 
···
 		return;
 
 	set->ops->destroy(set);
-	module_put(to_set_type(set->ops)->owner);
 	kfree(set->name);
 	kvfree(set);
 }

net/netfilter/nft_set_bitmap.c

···
 	return true;
 }
 
-struct nft_set_type nft_set_bitmap_type __read_mostly = {
-	.owner		= THIS_MODULE,
+const struct nft_set_type nft_set_bitmap_type = {
 	.ops		= {
 		.privsize	= nft_bitmap_privsize,
 		.elemsize	= offsetof(struct nft_bitmap_elem, ext),

net/netfilter/nft_set_hash.c

···
 	return true;
 }
 
-struct nft_set_type nft_set_rhash_type __read_mostly = {
-	.owner		= THIS_MODULE,
+const struct nft_set_type nft_set_rhash_type = {
 	.features	= NFT_SET_MAP | NFT_SET_OBJECT |
 			  NFT_SET_TIMEOUT | NFT_SET_EVAL,
 	.ops		= {
···
 	},
 };
 
-struct nft_set_type nft_set_hash_type __read_mostly = {
-	.owner		= THIS_MODULE,
+const struct nft_set_type nft_set_hash_type = {
 	.features	= NFT_SET_MAP | NFT_SET_OBJECT,
 	.ops		= {
 		.privsize       = nft_hash_privsize,
···
 	},
 };
 
-struct nft_set_type nft_set_hash_fast_type __read_mostly = {
-	.owner		= THIS_MODULE,
+const struct nft_set_type nft_set_hash_fast_type = {
 	.features	= NFT_SET_MAP | NFT_SET_OBJECT,
 	.ops		= {
 		.privsize       = nft_hash_privsize,

net/netfilter/nft_set_pipapo.c

···
 	priv->last_gc = jiffies;
 }
 
-struct nft_set_type nft_set_pipapo_type __read_mostly = {
-	.owner		= THIS_MODULE,
+const struct nft_set_type nft_set_pipapo_type = {
 	.features	= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_OBJECT |
 			  NFT_SET_TIMEOUT,
 	.ops		= {

net/netfilter/nft_set_rbtree.c

···
 	return true;
 }
 
-struct nft_set_type nft_set_rbtree_type __read_mostly = {
-	.owner		= THIS_MODULE,
+const struct nft_set_type nft_set_rbtree_type = {
 	.features	= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_OBJECT | NFT_SET_TIMEOUT,
 	.ops		= {
 		.privsize	= nft_rbtree_privsize,