+static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
+ [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
+};
+
+static int nft_set_desc_concat_parse(const struct nlattr *attr,
+ struct nft_set_desc *desc)
+{
+ struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
+ u32 len;
+ int err;
+
+ err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
+ nft_concat_policy, NULL);
+ if (err < 0)
+ return err;
+
+ if (!tb[NFTA_SET_FIELD_LEN])
+ return -EINVAL;
+
+ len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
+
+ if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
+ return -E2BIG;
+
+ desc->field_len[desc->field_count++] = len;
+
+ return 0;
+}
+
+static int nft_set_desc_concat(struct nft_set_desc *desc,
+ const struct nlattr *nla)
+{
+ struct nlattr *attr;
+ int rem, err;
+
+ nla_for_each_nested(attr, nla, rem) {
+ if (nla_type(attr) != NFTA_LIST_ELEM)
+ return -EINVAL;
+
+ err = nft_set_desc_concat_parse(attr, desc);
+ if (err < 0)
+ return err;
+ }
+
+ return 0;
+}
+