[linux-2.6-block.git] / net / netfilter / nft_nat.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
 * Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>
 * Copyright (c) 2012 Intel Corporation
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/string.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_tables.h>
#include <net/ip.h>

struct nft_nat {
	enum nft_registers      sreg_addr_min:8;
	enum nft_registers      sreg_addr_max:8;
	enum nft_registers      sreg_proto_min:8;
	enum nft_registers      sreg_proto_max:8;
	enum nf_nat_manip_type  type:8;
	u8			family;
	u16			flags;
};

static void nft_nat_eval(const struct nft_expr *expr,
			 struct nft_regs *regs,
			 const struct nft_pktinfo *pkt)
{
	const struct nft_nat *priv = nft_expr_priv(expr);
	enum ip_conntrack_info ctinfo;
	struct nf_conn *ct = nf_ct_get(pkt->skb, &ctinfo);
	struct nf_nat_range2 range;

	memset(&range, 0, sizeof(range));
	if (priv->sreg_addr_min) {
		if (priv->family == AF_INET) {
			range.min_addr.ip = (__force __be32)
					regs->data[priv->sreg_addr_min];
			range.max_addr.ip = (__force __be32)
					regs->data[priv->sreg_addr_max];

		} else {
			memcpy(range.min_addr.ip6,
			       &regs->data[priv->sreg_addr_min],
			       sizeof(range.min_addr.ip6));
			memcpy(range.max_addr.ip6,
			       &regs->data[priv->sreg_addr_max],
			       sizeof(range.max_addr.ip6));
		}
		range.flags |= NF_NAT_RANGE_MAP_IPS;
	}

	if (priv->sreg_proto_min) {
		range.min_proto.all = (__force __be16)nft_reg_load16(
			&regs->data[priv->sreg_proto_min]);
		range.max_proto.all = (__force __be16)nft_reg_load16(
			&regs->data[priv->sreg_proto_max]);
		range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
	}

	range.flags |= priv->flags;

	regs->verdict.code = nf_nat_setup_info(ct, &range, priv->type);
}

static const struct nla_policy nft_nat_policy[NFTA_NAT_MAX + 1] = {
	[NFTA_NAT_TYPE]		 = { .type = NLA_U32 },
	[NFTA_NAT_FAMILY]	 = { .type = NLA_U32 },
	[NFTA_NAT_REG_ADDR_MIN]	 = { .type = NLA_U32 },
	[NFTA_NAT_REG_ADDR_MAX]	 = { .type = NLA_U32 },
	[NFTA_NAT_REG_PROTO_MIN] = { .type = NLA_U32 },
	[NFTA_NAT_REG_PROTO_MAX] = { .type = NLA_U32 },
	[NFTA_NAT_FLAGS]	 = { .type = NLA_U32 },
};

static int nft_nat_validate(const struct nft_ctx *ctx,
			    const struct nft_expr *expr,
			    const struct nft_data **data)
{
	struct nft_nat *priv = nft_expr_priv(expr);
	int err;

	err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT);
	if (err < 0)
		return err;

	switch (priv->type) {
	case NFT_NAT_SNAT:
		err = nft_chain_validate_hooks(ctx->chain,
					       (1 << NF_INET_POST_ROUTING) |
					       (1 << NF_INET_LOCAL_IN));
		break;
	case NFT_NAT_DNAT:
		err = nft_chain_validate_hooks(ctx->chain,
					       (1 << NF_INET_PRE_ROUTING) |
					       (1 << NF_INET_LOCAL_OUT));
		break;
	}

	return err;
}

static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
			const struct nlattr * const tb[])
{
	struct nft_nat *priv = nft_expr_priv(expr);
	unsigned int alen, plen;
	u32 family;
	int err;

	if (tb[NFTA_NAT_TYPE] == NULL ||
	    (tb[NFTA_NAT_REG_ADDR_MIN] == NULL &&
	     tb[NFTA_NAT_REG_PROTO_MIN] == NULL))
		return -EINVAL;

	switch (ntohl(nla_get_be32(tb[NFTA_NAT_TYPE]))) {
	case NFT_NAT_SNAT:
		priv->type = NF_NAT_MANIP_SRC;
		break;
	case NFT_NAT_DNAT:
		priv->type = NF_NAT_MANIP_DST;
		break;
	default:
		return -EINVAL;
	}

	if (tb[NFTA_NAT_FAMILY] == NULL)
		return -EINVAL;

	family = ntohl(nla_get_be32(tb[NFTA_NAT_FAMILY]));
	if (ctx->family != NFPROTO_INET && ctx->family != family)
		return -EOPNOTSUPP;

	switch (family) {
	case NFPROTO_IPV4:
		alen = FIELD_SIZEOF(struct nf_nat_range, min_addr.ip);
		break;
	case NFPROTO_IPV6:
		alen = FIELD_SIZEOF(struct nf_nat_range, min_addr.ip6);
		break;
	default:
		return -EAFNOSUPPORT;
	}
	priv->family = family;

	if (tb[NFTA_NAT_REG_ADDR_MIN]) {
		priv->sreg_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 =
				nft_parse_register(tb[NFTA_NAT_REG_ADDR_MAX]);

			err = nft_validate_register_load(priv->sreg_addr_max,
							 alen);
			if (err < 0)
				return err;
		} else {
			priv->sreg_addr_max = priv->sreg_addr_min;
		}
	}

	plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all);
	if (tb[NFTA_NAT_REG_PROTO_MIN]) {
		priv->sreg_proto_min =
			nft_parse_register(tb[NFTA_NAT_REG_PROTO_MIN]);

		err = nft_validate_register_load(priv->sreg_proto_min, plen);
		if (err < 0)
			return err;

		if (tb[NFTA_NAT_REG_PROTO_MAX]) {
			priv->sreg_proto_max =
				nft_parse_register(tb[NFTA_NAT_REG_PROTO_MAX]);

			err = nft_validate_register_load(priv->sreg_proto_max,
							 plen);
			if (err < 0)
				return err;
		} else {
			priv->sreg_proto_max = priv->sreg_proto_min;
		}
	}

	if (tb[NFTA_NAT_FLAGS]) {
		priv->flags = ntohl(nla_get_be32(tb[NFTA_NAT_FLAGS]));
		if (priv->flags & ~NF_NAT_RANGE_MASK)
			return -EINVAL;
	}

	return nf_ct_netns_get(ctx->net, family);
}

static int nft_nat_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
	const struct nft_nat *priv = nft_expr_priv(expr);

	switch (priv->type) {
	case NF_NAT_MANIP_SRC:
		if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_SNAT)))
			goto nla_put_failure;
		break;
	case NF_NAT_MANIP_DST:
		if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_DNAT)))
			goto nla_put_failure;
		break;
	}

	if (nla_put_be32(skb, NFTA_NAT_FAMILY, htonl(priv->family)))
		goto nla_put_failure;

	if (priv->sreg_addr_min) {
		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 (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;
	}

	if (priv->flags != 0) {
		if (nla_put_be32(skb, NFTA_NAT_FLAGS, htonl(priv->flags)))
			goto nla_put_failure;
	}

	return 0;

nla_put_failure:
	return -1;
}

static void
nft_nat_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
{
	const struct nft_nat *priv = nft_expr_priv(expr);

	nf_ct_netns_put(ctx->net, priv->family);
}

static struct nft_expr_type nft_nat_type;
static const struct nft_expr_ops nft_nat_ops = {
	.type           = &nft_nat_type,
	.size           = NFT_EXPR_SIZE(sizeof(struct nft_nat)),
	.eval           = nft_nat_eval,
	.init           = nft_nat_init,
	.destroy        = nft_nat_destroy,
	.dump           = nft_nat_dump,
	.validate	= nft_nat_validate,
};

static struct nft_expr_type nft_nat_type __read_mostly = {
	.name           = "nat",
	.ops            = &nft_nat_ops,
	.policy         = nft_nat_policy,
	.maxattr        = NFTA_NAT_MAX,
	.owner          = THIS_MODULE,
};

#ifdef CONFIG_NF_TABLES_INET
static void nft_nat_inet_eval(const struct nft_expr *expr,
			      struct nft_regs *regs,
			      const struct nft_pktinfo *pkt)
{
	const struct nft_nat *priv = nft_expr_priv(expr);

	if (priv->family == nft_pf(pkt))
		nft_nat_eval(expr, regs, pkt);
}

static const struct nft_expr_ops nft_nat_inet_ops = {
	.type           = &nft_nat_type,
	.size           = NFT_EXPR_SIZE(sizeof(struct nft_nat)),
	.eval           = nft_nat_inet_eval,
	.init           = nft_nat_init,
	.destroy        = nft_nat_destroy,
	.dump           = nft_nat_dump,
	.validate	= nft_nat_validate,
};

static struct nft_expr_type nft_inet_nat_type __read_mostly = {
	.name           = "nat",
	.family		= NFPROTO_INET,
	.ops            = &nft_nat_inet_ops,
	.policy         = nft_nat_policy,
	.maxattr        = NFTA_NAT_MAX,
	.owner          = THIS_MODULE,
};

static int nft_nat_inet_module_init(void)
{
	return nft_register_expr(&nft_inet_nat_type);
}

static void nft_nat_inet_module_exit(void)
{
	nft_unregister_expr(&nft_inet_nat_type);
}
#else
static int nft_nat_inet_module_init(void) { return 0; }
static void nft_nat_inet_module_exit(void) { }
#endif

static int __init nft_nat_module_init(void)
{
	int ret = nft_nat_inet_module_init();

	if (ret)
		return ret;

	ret = nft_register_expr(&nft_nat_type);
	if (ret)
		nft_nat_inet_module_exit();

	return ret;
}

static void __exit nft_nat_module_exit(void)
{
	nft_nat_inet_module_exit();
	nft_unregister_expr(&nft_nat_type);
}

module_init(nft_nat_module_init);
module_exit(nft_nat_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
MODULE_ALIAS_NFT_EXPR("nat");
Commit	Line	Data
75a6faf6	1	// SPDX-License-Identifier: GPL-2.0-only
eb31628e TB	2	/*
	3	* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
	4	* Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>
	5	* Copyright (c) 2012 Intel Corporation
eb31628e TB	6	*/
	7
	8	#include <linux/module.h>
	9	#include <linux/init.h>
	10	#include <linux/skbuff.h>
	11	#include <linux/ip.h>
	12	#include <linux/string.h>
	13	#include <linux/netlink.h>
	14	#include <linux/netfilter.h>
	15	#include <linux/netfilter_ipv4.h>
	16	#include <linux/netfilter/nfnetlink.h>
	17	#include <linux/netfilter/nf_tables.h>
	18	#include <net/netfilter/nf_conntrack.h>
	19	#include <net/netfilter/nf_nat.h>
eb31628e	20	#include <net/netfilter/nf_tables.h>
eb31628e TB	21	#include <net/ip.h>
	22
	23	struct nft_nat {
	24	enum nft_registers sreg_addr_min:8;
	25	enum nft_registers sreg_addr_max:8;
	26	enum nft_registers sreg_proto_min:8;
	27	enum nft_registers sreg_proto_max:8;
a4c2e8be PM	28	enum nf_nat_manip_type type:8;
a4c2e8be PM	29	u8 family;
e42eff8a	30	u16 flags;
eb31628e TB	31	};
	32
	33	static void nft_nat_eval(const struct nft_expr *expr,
a55e22e9	34	struct nft_regs *regs,
eb31628e TB	35	const struct nft_pktinfo *pkt)
	36	{
	37	const struct nft_nat *priv = nft_expr_priv(expr);
	38	enum ip_conntrack_info ctinfo;
	39	struct nf_conn *ct = nf_ct_get(pkt->skb, &ctinfo);
2eb0f624	40	struct nf_nat_range2 range;
eb31628e TB	41
	42	memset(&range, 0, sizeof(range));
	43	if (priv->sreg_addr_min) {
	44	if (priv->family == AF_INET) {
98c37b6b	45	range.min_addr.ip = (__force __be32)
49499c3e	46	regs->data[priv->sreg_addr_min];
98c37b6b	47	range.max_addr.ip = (__force __be32)
49499c3e	48	regs->data[priv->sreg_addr_max];
eb31628e TB	49
	50	} else {
	51	memcpy(range.min_addr.ip6,
49499c3e PM	52	&regs->data[priv->sreg_addr_min],
49499c3e PM	53	sizeof(range.min_addr.ip6));
eb31628e	54	memcpy(range.max_addr.ip6,
49499c3e PM	55	&regs->data[priv->sreg_addr_max],
49499c3e PM	56	sizeof(range.max_addr.ip6));
eb31628e TB	57	}
	58	range.flags \|= NF_NAT_RANGE_MAP_IPS;
	59	}
	60
	61	if (priv->sreg_proto_min) {
10596608 LZ	62	range.min_proto.all = (__force __be16)nft_reg_load16(
	63	&regs->data[priv->sreg_proto_min]);
	64	range.max_proto.all = (__force __be16)nft_reg_load16(
	65	&regs->data[priv->sreg_proto_max]);
eb31628e TB	66	range.flags \|= NF_NAT_RANGE_PROTO_SPECIFIED;
	67	}
	68
e42eff8a AB	69	range.flags \|= priv->flags;
e42eff8a AB	70
a55e22e9	71	regs->verdict.code = nf_nat_setup_info(ct, &range, priv->type);
eb31628e TB	72	}
	73
	74	static const struct nla_policy nft_nat_policy[NFTA_NAT_MAX + 1] = {
	75	[NFTA_NAT_TYPE] = { .type = NLA_U32 },
	76	[NFTA_NAT_FAMILY] = { .type = NLA_U32 },
	77	[NFTA_NAT_REG_ADDR_MIN] = { .type = NLA_U32 },
	78	[NFTA_NAT_REG_ADDR_MAX] = { .type = NLA_U32 },
	79	[NFTA_NAT_REG_PROTO_MIN] = { .type = NLA_U32 },
	80	[NFTA_NAT_REG_PROTO_MAX] = { .type = NLA_U32 },
e42eff8a	81	[NFTA_NAT_FLAGS] = { .type = NLA_U32 },
eb31628e TB	82	};
eb31628e TB	83
75e8d06d PNA	84	static int nft_nat_validate(const struct nft_ctx *ctx,
	85	const struct nft_expr *expr,
	86	const struct nft_data **data)
eb31628e TB	87	{
	88	struct nft_nat *priv = nft_expr_priv(expr);
	89	int err;
	90
7210e4e3 PNA	91	err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT);
	92	if (err < 0)
	93	return err;
	94
75e8d06d PNA	95	switch (priv->type) {
	96	case NFT_NAT_SNAT:
	97	err = nft_chain_validate_hooks(ctx->chain,
	98	(1 << NF_INET_POST_ROUTING) \|
	99	(1 << NF_INET_LOCAL_IN));
	100	break;
	101	case NFT_NAT_DNAT:
	102	err = nft_chain_validate_hooks(ctx->chain,
	103	(1 << NF_INET_PRE_ROUTING) \|
	104	(1 << NF_INET_LOCAL_OUT));
	105	break;
	106	}
	107
	108	return err;
	109	}
	110
	111	static int nft_nat_init(const struct nft_ctx ctx, const struct nft_expr expr,
	112	const struct nlattr * const tb[])
	113	{
	114	struct nft_nat *priv = nft_expr_priv(expr);
d07db988	115	unsigned int alen, plen;
75e8d06d PNA	116	u32 family;
	117	int err;
	118
5c819a39 PNA	119	if (tb[NFTA_NAT_TYPE] == NULL \|\|
	120	(tb[NFTA_NAT_REG_ADDR_MIN] == NULL &&
	121	tb[NFTA_NAT_REG_PROTO_MIN] == NULL))
eb31628e TB	122	return -EINVAL;
	123
	124	switch (ntohl(nla_get_be32(tb[NFTA_NAT_TYPE]))) {
	125	case NFT_NAT_SNAT:
	126	priv->type = NF_NAT_MANIP_SRC;
	127	break;
	128	case NFT_NAT_DNAT:
	129	priv->type = NF_NAT_MANIP_DST;
	130	break;
	131	default:
	132	return -EINVAL;
	133	}
	134
	135	if (tb[NFTA_NAT_FAMILY] == NULL)
	136	return -EINVAL;
	137
a4c2e8be	138	family = ntohl(nla_get_be32(tb[NFTA_NAT_FAMILY]));
d164385e	139	if (ctx->family != NFPROTO_INET && ctx->family != family)
a4c2e8be	140	return -EOPNOTSUPP;
d07db988 PM	141
	142	switch (family) {
	143	case NFPROTO_IPV4:
	144	alen = FIELD_SIZEOF(struct nf_nat_range, min_addr.ip);
	145	break;
	146	case NFPROTO_IPV6:
	147	alen = FIELD_SIZEOF(struct nf_nat_range, min_addr.ip6);
	148	break;
	149	default:
	150	return -EAFNOSUPPORT;
	151	}
a4c2e8be	152	priv->family = family;
eb31628e TB	153
eb31628e TB	154	if (tb[NFTA_NAT_REG_ADDR_MIN]) {
61cfac6b	155	priv->sreg_addr_min =
b1c96ed3	156	nft_parse_register(tb[NFTA_NAT_REG_ADDR_MIN]);
d07db988	157	err = nft_validate_register_load(priv->sreg_addr_min, alen);
eb31628e TB	158	if (err < 0)
eb31628e TB	159	return err;
eb31628e	160
61cfac6b PNA	161	if (tb[NFTA_NAT_REG_ADDR_MAX]) {
61cfac6b PNA	162	priv->sreg_addr_max =
b1c96ed3	163	nft_parse_register(tb[NFTA_NAT_REG_ADDR_MAX]);
61cfac6b	164
d07db988 PM	165	err = nft_validate_register_load(priv->sreg_addr_max,
d07db988 PM	166	alen);
61cfac6b PNA	167	if (err < 0)
	168	return err;
	169	} else {
	170	priv->sreg_addr_max = priv->sreg_addr_min;
	171	}
	172	}
eb31628e	173
d07db988	174	plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all);
eb31628e	175	if (tb[NFTA_NAT_REG_PROTO_MIN]) {
61cfac6b	176	priv->sreg_proto_min =
b1c96ed3	177	nft_parse_register(tb[NFTA_NAT_REG_PROTO_MIN]);
61cfac6b	178
d07db988	179	err = nft_validate_register_load(priv->sreg_proto_min, plen);
eb31628e TB	180	if (err < 0)
eb31628e TB	181	return err;
eb31628e	182
61cfac6b PNA	183	if (tb[NFTA_NAT_REG_PROTO_MAX]) {
61cfac6b PNA	184	priv->sreg_proto_max =
b1c96ed3	185	nft_parse_register(tb[NFTA_NAT_REG_PROTO_MAX]);
61cfac6b	186
d07db988 PM	187	err = nft_validate_register_load(priv->sreg_proto_max,
d07db988 PM	188	plen);
61cfac6b PNA	189	if (err < 0)
	190	return err;
	191	} else {
	192	priv->sreg_proto_max = priv->sreg_proto_min;
	193	}
	194	}
eb31628e	195
e42eff8a AB	196	if (tb[NFTA_NAT_FLAGS]) {
	197	priv->flags = ntohl(nla_get_be32(tb[NFTA_NAT_FLAGS]));
	198	if (priv->flags & ~NF_NAT_RANGE_MASK)
	199	return -EINVAL;
	200	}
	201
20afd423	202	return nf_ct_netns_get(ctx->net, family);
eb31628e TB	203	}
	204
	205	static int nft_nat_dump(struct sk_buff skb, const struct nft_expr expr)
	206	{
	207	const struct nft_nat *priv = nft_expr_priv(expr);
	208
	209	switch (priv->type) {
	210	case NF_NAT_MANIP_SRC:
	211	if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_SNAT)))
	212	goto nla_put_failure;
	213	break;
	214	case NF_NAT_MANIP_DST:
	215	if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_DNAT)))
	216	goto nla_put_failure;
	217	break;
	218	}
	219
	220	if (nla_put_be32(skb, NFTA_NAT_FAMILY, htonl(priv->family)))
	221	goto nla_put_failure;
1e2d56a5 PNA	222
1e2d56a5 PNA	223	if (priv->sreg_addr_min) {
b1c96ed3 PM	224	if (nft_dump_register(skb, NFTA_NAT_REG_ADDR_MIN,
	225	priv->sreg_addr_min) \|\|
	226	nft_dump_register(skb, NFTA_NAT_REG_ADDR_MAX,
	227	priv->sreg_addr_max))
1e2d56a5 PNA	228	goto nla_put_failure;
	229	}
	230
91513606	231	if (priv->sreg_proto_min) {
b1c96ed3 PM	232	if (nft_dump_register(skb, NFTA_NAT_REG_PROTO_MIN,
	233	priv->sreg_proto_min) \|\|
	234	nft_dump_register(skb, NFTA_NAT_REG_PROTO_MAX,
	235	priv->sreg_proto_max))
91513606 PNA	236	goto nla_put_failure;
91513606 PNA	237	}
e42eff8a AB	238
	239	if (priv->flags != 0) {
	240	if (nla_put_be32(skb, NFTA_NAT_FLAGS, htonl(priv->flags)))
	241	goto nla_put_failure;
	242	}
	243
eb31628e TB	244	return 0;
	245
	246	nla_put_failure:
	247	return -1;
	248	}
	249
20afd423 FW	250	static void
	251	nft_nat_destroy(const struct nft_ctx ctx, const struct nft_expr expr)
	252	{
	253	const struct nft_nat *priv = nft_expr_priv(expr);
	254
	255	nf_ct_netns_put(ctx->net, priv->family);
	256	}
	257
eb31628e TB	258	static struct nft_expr_type nft_nat_type;
	259	static const struct nft_expr_ops nft_nat_ops = {
	260	.type = &nft_nat_type,
	261	.size = NFT_EXPR_SIZE(sizeof(struct nft_nat)),
	262	.eval = nft_nat_eval,
	263	.init = nft_nat_init,
20afd423	264	.destroy = nft_nat_destroy,
eb31628e	265	.dump = nft_nat_dump,
7210e4e3	266	.validate = nft_nat_validate,
eb31628e TB	267	};
	268
	269	static struct nft_expr_type nft_nat_type __read_mostly = {
	270	.name = "nat",
	271	.ops = &nft_nat_ops,
	272	.policy = nft_nat_policy,
	273	.maxattr = NFTA_NAT_MAX,
	274	.owner = THIS_MODULE,
	275	};
	276
d164385e FW	277	#ifdef CONFIG_NF_TABLES_INET
	278	static void nft_nat_inet_eval(const struct nft_expr *expr,
	279	struct nft_regs *regs,
	280	const struct nft_pktinfo *pkt)
	281	{
	282	const struct nft_nat *priv = nft_expr_priv(expr);
	283
	284	if (priv->family == nft_pf(pkt))
	285	nft_nat_eval(expr, regs, pkt);
	286	}
	287
	288	static const struct nft_expr_ops nft_nat_inet_ops = {
	289	.type = &nft_nat_type,
	290	.size = NFT_EXPR_SIZE(sizeof(struct nft_nat)),
	291	.eval = nft_nat_inet_eval,
	292	.init = nft_nat_init,
	293	.destroy = nft_nat_destroy,
	294	.dump = nft_nat_dump,
	295	.validate = nft_nat_validate,
	296	};
	297
	298	static struct nft_expr_type nft_inet_nat_type __read_mostly = {
	299	.name = "nat",
	300	.family = NFPROTO_INET,
	301	.ops = &nft_nat_inet_ops,
	302	.policy = nft_nat_policy,
	303	.maxattr = NFTA_NAT_MAX,
	304	.owner = THIS_MODULE,
	305	};
	306
	307	static int nft_nat_inet_module_init(void)
	308	{
	309	return nft_register_expr(&nft_inet_nat_type);
	310	}
	311
	312	static void nft_nat_inet_module_exit(void)
	313	{
	314	nft_unregister_expr(&nft_inet_nat_type);
	315	}
	316	#else
	317	static int nft_nat_inet_module_init(void) { return 0; }
	318	static void nft_nat_inet_module_exit(void) { }
	319	#endif
	320
eb31628e TB	321	static int __init nft_nat_module_init(void)
eb31628e TB	322	{
d164385e FW	323	int ret = nft_nat_inet_module_init();
	324
	325	if (ret)
	326	return ret;
	327
	328	ret = nft_register_expr(&nft_nat_type);
	329	if (ret)
	330	nft_nat_inet_module_exit();
	331
	332	return ret;
eb31628e TB	333	}
	334
	335	static void __exit nft_nat_module_exit(void)
	336	{
d164385e	337	nft_nat_inet_module_exit();
eb31628e TB	338	nft_unregister_expr(&nft_nat_type);
	339	}
	340
	341	module_init(nft_nat_module_init);
	342	module_exit(nft_nat_module_exit);
	343
	344	MODULE_LICENSE("GPL");
	345	MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
	346	MODULE_ALIAS_NFT_EXPR("nat");