netfilter: nf_tables: add register parsing/dumping helpers

Add helper functions to parse and dump register values in netlink attributes.
These helpers will later be changed to take care of translation between the
old 128 bit and the new 32 bit register numbers.
Signed-off-by: NPatrick McHardy <kaber@trash.net>
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>

include/net/netfilter/nf_tables.h

@@ -128,6 +128,9 @@ static inline enum nft_registers nft_type_to_reg(enum nft_data_types type)
 	return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1;
 }
 
+unsigned int nft_parse_register(const struct nlattr *attr);
+int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg);
+
 int nft_validate_register_load(enum nft_registers reg, unsigned int len);
 int nft_validate_register_store(const struct nft_ctx *ctx,
 				enum nft_registers reg,

net/bridge/netfilter/nft_meta_bridge.c

@@ -65,7 +65,7 @@ static int nft_meta_bridge_get_init(const struct nft_ctx *ctx,
 		return nft_meta_get_init(ctx, expr, tb);
 	}
 
-	priv->dreg = ntohl(nla_get_be32(tb[NFTA_META_DREG]));
+	priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
 	return nft_validate_register_store(ctx, priv->dreg, NULL,
 					   NFT_DATA_VALUE, len);
 }

net/netfilter/nf_tables_api.c

@@ -4122,6 +4122,18 @@ static int nf_tables_check_loops(const struct nft_ctx *ctx,
 	return 0;
 }
 
+unsigned int nft_parse_register(const struct nlattr *attr)
+{
+	return ntohl(nla_get_be32(attr));
+}
+EXPORT_SYMBOL_GPL(nft_parse_register);
+
+int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
+{
+	return nla_put_be32(skb, attr, htonl(reg));
+}
+EXPORT_SYMBOL_GPL(nft_dump_register);
+
 /**
  *	nft_validate_register_load - validate a load from a register
  *

net/netfilter/nft_bitwise.c

@@ -62,12 +62,12 @@ static int nft_bitwise_init(const struct nft_ctx *ctx,
 		return -EINVAL;
 
 	priv->len  = ntohl(nla_get_be32(tb[NFTA_BITWISE_LEN]));
-	priv->sreg = ntohl(nla_get_be32(tb[NFTA_BITWISE_SREG]));
+	priv->sreg = nft_parse_register(tb[NFTA_BITWISE_SREG]);
 	err = nft_validate_register_load(priv->sreg, priv->len);
 	if (err < 0)
 		return err;
 
-	priv->dreg = ntohl(nla_get_be32(tb[NFTA_BITWISE_DREG]));
+	priv->dreg = nft_parse_register(tb[NFTA_BITWISE_DREG]);
 	err = nft_validate_register_store(ctx, priv->dreg, NULL,
 					  NFT_DATA_VALUE, priv->len);
 	if (err < 0)
@@ -92,9 +92,9 @@ static int nft_bitwise_dump(struct sk_buff *skb, const struct nft_expr *expr)
 {
 	const struct nft_bitwise *priv = nft_expr_priv(expr);
 
-	if (nla_put_be32(skb, NFTA_BITWISE_SREG, htonl(priv->sreg)))
+	if (nft_dump_register(skb, NFTA_BITWISE_SREG, priv->sreg))
 		goto nla_put_failure;
-	if (nla_put_be32(skb, NFTA_BITWISE_DREG, htonl(priv->dreg)))
+	if (nft_dump_register(skb, NFTA_BITWISE_DREG, priv->dreg))
 		goto nla_put_failure;
 	if (nla_put_be32(skb, NFTA_BITWISE_LEN, htonl(priv->len)))
 		goto nla_put_failure;

net/netfilter/nft_byteorder.c

@@ -106,13 +106,13 @@ static int nft_byteorder_init(const struct nft_ctx *ctx,
 		return -EINVAL;
 	}
 
-	priv->sreg = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_SREG]));
+	priv->sreg = nft_parse_register(tb[NFTA_BYTEORDER_SREG]);
 	priv->len  = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_LEN]));
 	err = nft_validate_register_load(priv->sreg, priv->len);
 	if (err < 0)
 		return err;
 
-	priv->dreg = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_DREG]));
+	priv->dreg = nft_parse_register(tb[NFTA_BYTEORDER_DREG]);
 	return nft_validate_register_store(ctx, priv->dreg, NULL,
 					   NFT_DATA_VALUE, priv->len);
 }
@@ -121,9 +121,9 @@ static int nft_byteorder_dump(struct sk_buff *skb, const struct nft_expr *expr)
 {
 	const struct nft_byteorder *priv = nft_expr_priv(expr);
 
-	if (nla_put_be32(skb, NFTA_BYTEORDER_SREG, htonl(priv->sreg)))
+	if (nft_dump_register(skb, NFTA_BYTEORDER_SREG, priv->sreg))
 		goto nla_put_failure;
-	if (nla_put_be32(skb, NFTA_BYTEORDER_DREG, htonl(priv->dreg)))
+	if (nft_dump_register(skb, NFTA_BYTEORDER_DREG, priv->dreg))
 		goto nla_put_failure;
 	if (nla_put_be32(skb, NFTA_BYTEORDER_OP, htonl(priv->op)))
 		goto nla_put_failure;

net/netfilter/nft_cmp.c

@@ -78,7 +78,7 @@ static int nft_cmp_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
 	err = nft_data_init(NULL, &priv->data, &desc, tb[NFTA_CMP_DATA]);
 	BUG_ON(err < 0);
 
-	priv->sreg = ntohl(nla_get_be32(tb[NFTA_CMP_SREG]));
+	priv->sreg = nft_parse_register(tb[NFTA_CMP_SREG]);
 	err = nft_validate_register_load(priv->sreg, desc.len);
 	if (err < 0)
 		return err;
@@ -92,7 +92,7 @@ static int nft_cmp_dump(struct sk_buff *skb, const struct nft_expr *expr)
 {
 	const struct nft_cmp_expr *priv = nft_expr_priv(expr);
 
-	if (nla_put_be32(skb, NFTA_CMP_SREG, htonl(priv->sreg)))
+	if (nft_dump_register(skb, NFTA_CMP_SREG, priv->sreg))
 		goto nla_put_failure;
 	if (nla_put_be32(skb, NFTA_CMP_OP, htonl(priv->op)))
 		goto nla_put_failure;
@@ -128,7 +128,7 @@ static int nft_cmp_fast_init(const struct nft_ctx *ctx,
 	err = nft_data_init(NULL, &data, &desc, tb[NFTA_CMP_DATA]);
 	BUG_ON(err < 0);
 
-	priv->sreg = ntohl(nla_get_be32(tb[NFTA_CMP_SREG]));
+	priv->sreg = nft_parse_register(tb[NFTA_CMP_SREG]);
 	err = nft_validate_register_load(priv->sreg, desc.len);
 	if (err < 0)
 		return err;
@@ -146,7 +146,7 @@ static int nft_cmp_fast_dump(struct sk_buff *skb, const struct nft_expr *expr)
 	const struct nft_cmp_fast_expr *priv = nft_expr_priv(expr);
 	struct nft_data data;
 
-	if (nla_put_be32(skb, NFTA_CMP_SREG, htonl(priv->sreg)))
+	if (nft_dump_register(skb, NFTA_CMP_SREG, priv->sreg))
 		goto nla_put_failure;
 	if (nla_put_be32(skb, NFTA_CMP_OP, htonl(NFT_CMP_EQ)))
 		goto nla_put_failure;

net/netfilter/nft_ct.c

@@ -306,7 +306,7 @@ static int nft_ct_get_init(const struct nft_ctx *ctx,
 		}
 	}
 
-	priv->dreg = ntohl(nla_get_be32(tb[NFTA_CT_DREG]));
+	priv->dreg = nft_parse_register(tb[NFTA_CT_DREG]);
 	err = nft_validate_register_store(ctx, priv->dreg, NULL,
 					  NFT_DATA_VALUE, len);
 	if (err < 0)
@@ -338,7 +338,7 @@ static int nft_ct_set_init(const struct nft_ctx *ctx,
 		return -EOPNOTSUPP;
 	}
 
-	priv->sreg = ntohl(nla_get_be32(tb[NFTA_CT_SREG]));
+	priv->sreg = nft_parse_register(tb[NFTA_CT_SREG]);
 	err = nft_validate_register_load(priv->sreg, len);
 	if (err < 0)
 		return err;
@@ -360,7 +360,7 @@ static int nft_ct_get_dump(struct sk_buff *skb, const struct nft_expr *expr)
 {
 	const struct nft_ct *priv = nft_expr_priv(expr);
 
-	if (nla_put_be32(skb, NFTA_CT_DREG, htonl(priv->dreg)))
+	if (nft_dump_register(skb, NFTA_CT_DREG, priv->dreg))
 		goto nla_put_failure;
 	if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
 		goto nla_put_failure;
@@ -387,7 +387,7 @@ static int nft_ct_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
 {
 	const struct nft_ct *priv = nft_expr_priv(expr);
 
-	if (nla_put_be32(skb, NFTA_CT_SREG, htonl(priv->sreg)))
+	if (nft_dump_register(skb, NFTA_CT_SREG, priv->sreg))
 		goto nla_put_failure;
 	if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
 		goto nla_put_failure;

net/netfilter/nft_dynset.c

@@ -124,7 +124,7 @@ static int nft_dynset_init(const struct nft_ctx *ctx,
 		timeout = be64_to_cpu(nla_get_be64(tb[NFTA_DYNSET_TIMEOUT]));
 	}
 
-	priv->sreg_key = ntohl(nla_get_be32(tb[NFTA_DYNSET_SREG_KEY]));
+	priv->sreg_key = nft_parse_register(tb[NFTA_DYNSET_SREG_KEY]);
 	err = nft_validate_register_load(priv->sreg_key, set->klen);;
 	if (err < 0)
 		return err;
@@ -135,7 +135,7 @@ static int nft_dynset_init(const struct nft_ctx *ctx,
 		if (set->dtype == NFT_DATA_VERDICT)
 			return -EOPNOTSUPP;
 
-		priv->sreg_data = ntohl(nla_get_be32(tb[NFTA_DYNSET_SREG_DATA]));
+		priv->sreg_data = nft_parse_register(tb[NFTA_DYNSET_SREG_DATA]);
 		err = nft_validate_register_load(priv->sreg_data, set->dlen);
 		if (err < 0)
 			return err;
@@ -173,10 +173,10 @@ static int nft_dynset_dump(struct sk_buff *skb, const struct nft_expr *expr)
 {
 	const struct nft_dynset *priv = nft_expr_priv(expr);
 
-	if (nla_put_be32(skb, NFTA_DYNSET_SREG_KEY, htonl(priv->sreg_key)))
+	if (nft_dump_register(skb, NFTA_DYNSET_SREG_KEY, priv->sreg_key))
 		goto nla_put_failure;
 	if (priv->set->flags & NFT_SET_MAP &&
-	    nla_put_be32(skb, NFTA_DYNSET_SREG_DATA, htonl(priv->sreg_data)))
+	    nft_dump_register(skb, NFTA_DYNSET_SREG_DATA, priv->sreg_data))
 		goto nla_put_failure;
 	if (nla_put_be32(skb, NFTA_DYNSET_OP, htonl(priv->op)))
 		goto nla_put_failure;

net/netfilter/nft_exthdr.c

@@ -68,7 +68,7 @@ static int nft_exthdr_init(const struct nft_ctx *ctx,
 	priv->type   = nla_get_u8(tb[NFTA_EXTHDR_TYPE]);
 	priv->offset = ntohl(nla_get_be32(tb[NFTA_EXTHDR_OFFSET]));
 	priv->len    = ntohl(nla_get_be32(tb[NFTA_EXTHDR_LEN]));
-	priv->dreg   = ntohl(nla_get_be32(tb[NFTA_EXTHDR_DREG]));
+	priv->dreg   = nft_parse_register(tb[NFTA_EXTHDR_DREG]);
 
 	return nft_validate_register_store(ctx, priv->dreg, NULL,
 					   NFT_DATA_VALUE, priv->len);
@@ -78,7 +78,7 @@ static int nft_exthdr_dump(struct sk_buff *skb, const struct nft_expr *expr)
 {
 	const struct nft_exthdr *priv = nft_expr_priv(expr);
 
-	if (nla_put_be32(skb, NFTA_EXTHDR_DREG, htonl(priv->dreg)))
+	if (nft_dump_register(skb, NFTA_EXTHDR_DREG, priv->dreg))
 		goto nla_put_failure;
 	if (nla_put_u8(skb, NFTA_EXTHDR_TYPE, priv->type))
 		goto nla_put_failure;

net/netfilter/nft_immediate.c

@@ -54,7 +54,7 @@ static int nft_immediate_init(const struct nft_ctx *ctx,
 		return err;
 	priv->dlen = desc.len;
 
-	priv->dreg = ntohl(nla_get_be32(tb[NFTA_IMMEDIATE_DREG]));
+	priv->dreg = nft_parse_register(tb[NFTA_IMMEDIATE_DREG]);
 	err = nft_validate_register_store(ctx, priv->dreg, &priv->data,
 					  desc.type, desc.len);
 	if (err < 0)
@@ -78,7 +78,7 @@ static int nft_immediate_dump(struct sk_buff *skb, const struct nft_expr *expr)
 {
 	const struct nft_immediate_expr *priv = nft_expr_priv(expr);
 
-	if (nla_put_be32(skb, NFTA_IMMEDIATE_DREG, htonl(priv->dreg)))
+	if (nft_dump_register(skb, NFTA_IMMEDIATE_DREG, priv->dreg))
 		goto nla_put_failure;
 
 	return nft_data_dump(skb, NFTA_IMMEDIATE_DATA, &priv->data,

net/netfilter/nft_lookup.c

@@ -71,7 +71,7 @@ static int nft_lookup_init(const struct nft_ctx *ctx,
 			return PTR_ERR(set);
 	}
 
-	priv->sreg = ntohl(nla_get_be32(tb[NFTA_LOOKUP_SREG]));
+	priv->sreg = nft_parse_register(tb[NFTA_LOOKUP_SREG]);
 	err = nft_validate_register_load(priv->sreg, set->klen);
 	if (err < 0)
 		return err;
@@ -80,7 +80,7 @@ static int nft_lookup_init(const struct nft_ctx *ctx,
 		if (!(set->flags & NFT_SET_MAP))
 			return -EINVAL;
 
-		priv->dreg = ntohl(nla_get_be32(tb[NFTA_LOOKUP_DREG]));
+		priv->dreg = nft_parse_register(tb[NFTA_LOOKUP_DREG]);
 		err = nft_validate_register_store(ctx, priv->dreg, NULL,
 						  set->dtype, set->dlen);
 		if (err < 0)
@@ -112,10 +112,10 @@ static int nft_lookup_dump(struct sk_buff *skb, const struct nft_expr *expr)
 
 	if (nla_put_string(skb, NFTA_LOOKUP_SET, priv->set->name))
 		goto nla_put_failure;
-	if (nla_put_be32(skb, NFTA_LOOKUP_SREG, htonl(priv->sreg)))
+	if (nft_dump_register(skb, NFTA_LOOKUP_SREG, priv->sreg))
 		goto nla_put_failure;
 	if (priv->set->flags & NFT_SET_MAP)
-		if (nla_put_be32(skb, NFTA_LOOKUP_DREG, htonl(priv->dreg)))
+		if (nft_dump_register(skb, NFTA_LOOKUP_DREG, priv->dreg))
 			goto nla_put_failure;
 	return 0;
 

net/netfilter/nft_meta.c

@@ -254,7 +254,7 @@ int nft_meta_get_init(const struct nft_ctx *ctx,
 		return -EOPNOTSUPP;
 	}
 
-	priv->dreg = ntohl(nla_get_be32(tb[NFTA_META_DREG]));
+	priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
 	return nft_validate_register_store(ctx, priv->dreg, NULL,
 					   NFT_DATA_VALUE, len);
 }
@@ -281,7 +281,7 @@ int nft_meta_set_init(const struct nft_ctx *ctx,
 		return -EOPNOTSUPP;
 	}
 
-	priv->sreg = ntohl(nla_get_be32(tb[NFTA_META_SREG]));
+	priv->sreg = nft_parse_register(tb[NFTA_META_SREG]);
 	err = nft_validate_register_load(priv->sreg, len);
 	if (err < 0)
 		return err;
@@ -297,7 +297,7 @@ int nft_meta_get_dump(struct sk_buff *skb,
 
 	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
 		goto nla_put_failure;
-	if (nla_put_be32(skb, NFTA_META_DREG, htonl(priv->dreg)))
+	if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg))
 		goto nla_put_failure;
 	return 0;
 
@@ -313,7 +313,7 @@ int nft_meta_set_dump(struct sk_buff *skb,
 
 	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
 		goto nla_put_failure;
-	if (nla_put_be32(skb, NFTA_META_SREG, htonl(priv->sreg)))
+	if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
 		goto nla_put_failure;
 
 	return 0;

net/netfilter/nft_nat.c

@@ -163,14 +163,14 @@ static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
 
 	if (tb[NFTA_NAT_REG_ADDR_MIN]) {
 		priv->sreg_addr_min =
-			ntohl(nla_get_be32(tb[NFTA_NAT_REG_ADDR_MIN]));
+			nft_parse_register(tb[NFTA_NAT_REG_ADDR_MIN]);
 		err = nft_validate_register_load(priv->sreg_addr_min, alen);
 		if (err < 0)
 			return err;
 
 		if (tb[NFTA_NAT_REG_ADDR_MAX]) {
 			priv->sreg_addr_max =
-				ntohl(nla_get_be32(tb[NFTA_NAT_REG_ADDR_MAX]));
+				nft_parse_register(tb[NFTA_NAT_REG_ADDR_MAX]);
 
 			err = nft_validate_register_load(priv->sreg_addr_max,
 							 alen);
@@ -184,7 +184,7 @@ static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
 	plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all);
 	if (tb[NFTA_NAT_REG_PROTO_MIN]) {
 		priv->sreg_proto_min =
-			ntohl(nla_get_be32(tb[NFTA_NAT_REG_PROTO_MIN]));
+			nft_parse_register(tb[NFTA_NAT_REG_PROTO_MIN]);
 
 		err = nft_validate_register_load(priv->sreg_proto_min, plen);
 		if (err < 0)
@@ -192,7 +192,7 @@ static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
 
 		if (tb[NFTA_NAT_REG_PROTO_MAX]) {
 			priv->sreg_proto_max =
-				ntohl(nla_get_be32(tb[NFTA_NAT_REG_PROTO_MAX]));
+				nft_parse_register(tb[NFTA_NAT_REG_PROTO_MAX]);
 
 			err = nft_validate_register_load(priv->sreg_proto_max,
 							 plen);
@@ -231,18 +231,18 @@ static int nft_nat_dump(struct sk_buff *skb, const struct nft_expr *expr)
 		goto nla_put_failure;
 
 	if (priv->sreg_addr_min) {
-		if (nla_put_be32(skb, NFTA_NAT_REG_ADDR_MIN,
-				 htonl(priv->sreg_addr_min)) ||
-		    nla_put_be32(skb, NFTA_NAT_REG_ADDR_MAX,
-				 htonl(priv->sreg_addr_max)))
+		if (nft_dump_register(skb, NFTA_NAT_REG_ADDR_MIN,
+				      priv->sreg_addr_min) ||
+		    nft_dump_register(skb, NFTA_NAT_REG_ADDR_MAX,
+				      priv->sreg_addr_max))
 			goto nla_put_failure;
 	}
 
 	if (priv->sreg_proto_min) {
-		if (nla_put_be32(skb, NFTA_NAT_REG_PROTO_MIN,
-				 htonl(priv->sreg_proto_min)) ||
-		    nla_put_be32(skb, NFTA_NAT_REG_PROTO_MAX,
-				 htonl(priv->sreg_proto_max)))
+		if (nft_dump_register(skb, NFTA_NAT_REG_PROTO_MIN,
+				      priv->sreg_proto_min) ||
+		    nft_dump_register(skb, NFTA_NAT_REG_PROTO_MAX,
+				      priv->sreg_proto_max))
 			goto nla_put_failure;
 	}
 

net/netfilter/nft_payload.c

@@ -66,7 +66,7 @@ static int nft_payload_init(const struct nft_ctx *ctx,
 	priv->base   = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE]));
 	priv->offset = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_OFFSET]));
 	priv->len    = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_LEN]));
-	priv->dreg   = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_DREG]));
+	priv->dreg   = nft_parse_register(tb[NFTA_PAYLOAD_DREG]);
 
 	return nft_validate_register_store(ctx, priv->dreg, NULL,
 					   NFT_DATA_VALUE, priv->len);
@@ -76,7 +76,7 @@ static int nft_payload_dump(struct sk_buff *skb, const struct nft_expr *expr)
 {
 	const struct nft_payload *priv = nft_expr_priv(expr);
 
-	if (nla_put_be32(skb, NFTA_PAYLOAD_DREG, htonl(priv->dreg)) ||
+	if (nft_dump_register(skb, NFTA_PAYLOAD_DREG, priv->dreg) ||
 	    nla_put_be32(skb, NFTA_PAYLOAD_BASE, htonl(priv->base)) ||
 	    nla_put_be32(skb, NFTA_PAYLOAD_OFFSET, htonl(priv->offset)) ||
 	    nla_put_be32(skb, NFTA_PAYLOAD_LEN, htonl(priv->len)))

net/netfilter/nft_redir.c

@@ -54,7 +54,7 @@ int nft_redir_init(const struct nft_ctx *ctx,
 	plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all);
 	if (tb[NFTA_REDIR_REG_PROTO_MIN]) {
 		priv->sreg_proto_min =
-			ntohl(nla_get_be32(tb[NFTA_REDIR_REG_PROTO_MIN]));
+			nft_parse_register(tb[NFTA_REDIR_REG_PROTO_MIN]);
 
 		err = nft_validate_register_load(priv->sreg_proto_min, plen);
 		if (err < 0)
@@ -62,7 +62,7 @@ int nft_redir_init(const struct nft_ctx *ctx,
 
 		if (tb[NFTA_REDIR_REG_PROTO_MAX]) {
 			priv->sreg_proto_max =
-				ntohl(nla_get_be32(tb[NFTA_REDIR_REG_PROTO_MAX]));
+				nft_parse_register(tb[NFTA_REDIR_REG_PROTO_MAX]);
 
 			err = nft_validate_register_load(priv->sreg_proto_max,
 							 plen);
@@ -88,11 +88,11 @@ int nft_redir_dump(struct sk_buff *skb, const struct nft_expr *expr)
 	const struct nft_redir *priv = nft_expr_priv(expr);
 
 	if (priv->sreg_proto_min) {
-		if (nla_put_be32(skb, NFTA_REDIR_REG_PROTO_MIN,
-				 htonl(priv->sreg_proto_min)))
+		if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MIN,
+				      priv->sreg_proto_min))
 			goto nla_put_failure;
-		if (nla_put_be32(skb, NFTA_REDIR_REG_PROTO_MAX,
-				 htonl(priv->sreg_proto_max)))
+		if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MAX,
+				      priv->sreg_proto_max))
 			goto nla_put_failure;
 	}