netfilter: nf_tables: kill nft_data_cmp()

Only needlessly complicates things due to requiring specific argument
types. Use memcmp directly.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

include/net/netfilter/nf_tables.h

@@ -69,13 +69,6 @@ struct nft_regs {
 	};
 };
 
-static inline int nft_data_cmp(const struct nft_data *d1,
-			       const struct nft_data *d2,
-			       unsigned int len)
-{
-	return memcmp(d1->data, d2->data, len);
-}
-
 static inline void nft_data_copy(struct nft_data *dst,
 				 const struct nft_data *src)
 {

net/netfilter/nft_cmp.c

@@ -31,7 +31,7 @@ static void nft_cmp_eval(const struct nft_expr *expr,
 	const struct nft_cmp_expr *priv = nft_expr_priv(expr);
 	int d;
 
-	d = nft_data_cmp(&regs->data[priv->sreg], &priv->data, priv->len);
+	d = memcmp(&regs->data[priv->sreg], &priv->data, priv->len);
 	switch (priv->op) {
 	case NFT_CMP_EQ:
 		if (d != 0)

net/netfilter/nft_hash.c

@@ -62,7 +62,7 @@ static inline int nft_hash_cmp(struct rhashtable_compare_arg *arg,
 	const struct nft_hash_cmp_arg *x = arg->key;
 	const struct nft_hash_elem *he = ptr;
 
-	if (nft_data_cmp(nft_set_ext_key(&he->ext), x->key, x->set->klen))
+	if (memcmp(nft_set_ext_key(&he->ext), x->key, x->set->klen))
 		return 1;
 	if (nft_set_elem_expired(&he->ext))
 		return 1;

net/netfilter/nft_rbtree.c

@@ -45,7 +45,7 @@ static bool nft_rbtree_lookup(const struct nft_set *set,
 	while (parent != NULL) {
 		rbe = rb_entry(parent, struct nft_rbtree_elem, node);
 
-		d = nft_data_cmp(nft_set_ext_key(&rbe->ext), key, set->klen);
+		d = memcmp(nft_set_ext_key(&rbe->ext), key, set->klen);
 		if (d < 0) {
 			parent = parent->rb_left;
 			interval = rbe;
@@ -91,7 +91,7 @@ static int __nft_rbtree_insert(const struct nft_set *set,
 	while (*p != NULL) {
 		parent = *p;
 		rbe = rb_entry(parent, struct nft_rbtree_elem, node);
-		d = nft_data_cmp(nft_set_ext_key(&rbe->ext),
+		d = memcmp(nft_set_ext_key(&rbe->ext),
 			   nft_set_ext_key(&new->ext),
 			   set->klen);
 		if (d < 0)
@@ -153,8 +153,7 @@ static void *nft_rbtree_deactivate(const struct nft_set *set,
 	while (parent != NULL) {
 		rbe = rb_entry(parent, struct nft_rbtree_elem, node);
 
-		d = nft_data_cmp(nft_set_ext_key(&rbe->ext), &elem->key,
-				 set->klen);
+		d = memcmp(nft_set_ext_key(&rbe->ext), &elem->key, set->klen);
 		if (d < 0)
 			parent = parent->rb_left;
 		else if (d > 0)