static int nf_tables_getsetelem(struct sk_buff *skb,
				const struct nfnl_info *info,
				const struct nlattr * const nla[])
{
	struct netlink_ext_ack *extack = info->extack;
	u8 genmask = nft_genmask_cur(info->net);
	u8 family = info->nfmsg->nfgen_family;
	struct net *net = info->net;
	struct nft_table *table;
	struct nft_set *set;
	struct nlattr *attr;
	struct nft_ctx ctx;
	int rem, err = 0;

	table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
				 genmask, NETLINK_CB(skb).portid);
	if (IS_ERR(table)) {
		NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
		return PTR_ERR(table);
	}

	set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
	if (IS_ERR(set))
		return PTR_ERR(set);

	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);

	if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
		struct netlink_dump_control c = {
			.start = nf_tables_dump_set_start,
			.dump = nf_tables_dump_set,
			.done = nf_tables_dump_set_done,
			.module = THIS_MODULE,
		};
		struct nft_set_dump_ctx dump_ctx = {
			.set = set,
			.ctx = ctx,
		};

		c.data = &dump_ctx;
		return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
	}

	if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
		return -EINVAL;

	nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
		err = nft_get_set_elem(&ctx, set, attr);
		if (err < 0) {
			NL_SET_BAD_ATTR(extack, attr);
			break;
		}
	}

	return err;
}
Unknown