[mirror_ubuntu-jammy-kernel.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_setup_addr(struct nf_nat_range2 *range,
			       const struct nft_regs *regs,
			       const struct nft_nat *priv)
{
	switch (priv->family) {
	case 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];
		break;
	case AF_INET6:
		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));
		break;
	}
}

static void nft_nat_setup_proto(struct nf_nat_range2 *range,
				const struct nft_regs *regs,
				const struct nft_nat *priv)
{
	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]);
}

static void nft_nat_setup_netmap(struct nf_nat_range2 *range,
				 const struct nft_pktinfo *pkt,
				 const struct nft_nat *priv)
{
	struct sk_buff *skb = pkt->skb;
	union nf_inet_addr new_addr;
	__be32 netmask;
	int i, len = 0;

	switch (priv->type) {
	case NFT_NAT_SNAT:
		if (nft_pf(pkt) == NFPROTO_IPV4) {
			new_addr.ip = ip_hdr(skb)->saddr;
			len = sizeof(struct in_addr);
		} else {
			new_addr.in6 = ipv6_hdr(skb)->saddr;
			len = sizeof(struct in6_addr);
		}
		break;
	case NFT_NAT_DNAT:
		if (nft_pf(pkt) == NFPROTO_IPV4) {
			new_addr.ip = ip_hdr(skb)->daddr;
			len = sizeof(struct in_addr);
		} else {
			new_addr.in6 = ipv6_hdr(skb)->daddr;
			len = sizeof(struct in6_addr);
		}
		break;
	}

	for (i = 0; i < len / sizeof(__be32); i++) {
		netmask = ~(range->min_addr.ip6[i] ^ range->max_addr.ip6[i]);
		new_addr.ip6[i] &= ~netmask;
		new_addr.ip6[i] |= range->min_addr.ip6[i] & netmask;
	}

	range->min_addr = new_addr;
	range->max_addr = new_addr;
}

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) {
		nft_nat_setup_addr(&range, regs, priv);
		if (priv->flags & NF_NAT_RANGE_NETMAP)
			nft_nat_setup_netmap(&range, pkt, priv);
	}

	if (priv->sreg_proto_min)
		nft_nat_setup_proto(&range, regs, priv);

	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 -EOPNOTSUPP;
	}

	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 = sizeof_field(struct nf_nat_range, min_addr.ip);
		break;
	case NFPROTO_IPV6:
		alen = sizeof_field(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;
		}

		priv->flags |= NF_NAT_RANGE_MAP_IPS;
	}

	plen = sizeof_field(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;
		}

		priv->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
	}

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

	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");
MODULE_DESCRIPTION("Network Address Translation support");
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	};
eb31628e TB	32
acd766e3 PNA	33	static void nft_nat_setup_addr(struct nf_nat_range2 *range,
	34	const struct nft_regs *regs,
	35	const struct nft_nat *priv)
	36	{
	37	switch (priv->family) {
	38	case AF_INET:
	39	range->min_addr.ip = (__force __be32)
	40	regs->data[priv->sreg_addr_min];
	41	range->max_addr.ip = (__force __be32)
	42	regs->data[priv->sreg_addr_max];
	43	break;
	44	case AF_INET6:
	45	memcpy(range->min_addr.ip6, &regs->data[priv->sreg_addr_min],
	46	sizeof(range->min_addr.ip6));
	47	memcpy(range->max_addr.ip6, &regs->data[priv->sreg_addr_max],
	48	sizeof(range->max_addr.ip6));
	49	break;
	50	}
	51	}
	52
	53	static void nft_nat_setup_proto(struct nf_nat_range2 *range,
	54	const struct nft_regs *regs,
	55	const struct nft_nat *priv)
	56	{
	57	range->min_proto.all = (__force __be16)
	58	nft_reg_load16(&regs->data[priv->sreg_proto_min]);
	59	range->max_proto.all = (__force __be16)
	60	nft_reg_load16(&regs->data[priv->sreg_proto_max]);
	61	}
	62
3ff7ddb1 PNA	63	static void nft_nat_setup_netmap(struct nf_nat_range2 *range,
	64	const struct nft_pktinfo *pkt,
	65	const struct nft_nat *priv)
	66	{
	67	struct sk_buff *skb = pkt->skb;
	68	union nf_inet_addr new_addr;
	69	__be32 netmask;
	70	int i, len = 0;
	71
	72	switch (priv->type) {
	73	case NFT_NAT_SNAT:
	74	if (nft_pf(pkt) == NFPROTO_IPV4) {
	75	new_addr.ip = ip_hdr(skb)->saddr;
	76	len = sizeof(struct in_addr);
	77	} else {
	78	new_addr.in6 = ipv6_hdr(skb)->saddr;
	79	len = sizeof(struct in6_addr);
	80	}
	81	break;
	82	case NFT_NAT_DNAT:
	83	if (nft_pf(pkt) == NFPROTO_IPV4) {
	84	new_addr.ip = ip_hdr(skb)->daddr;
	85	len = sizeof(struct in_addr);
	86	} else {
	87	new_addr.in6 = ipv6_hdr(skb)->daddr;
	88	len = sizeof(struct in6_addr);
	89	}
	90	break;
	91	}
	92
	93	for (i = 0; i < len / sizeof(__be32); i++) {
	94	netmask = ~(range->min_addr.ip6[i] ^ range->max_addr.ip6[i]);
	95	new_addr.ip6[i] &= ~netmask;
	96	new_addr.ip6[i] \|= range->min_addr.ip6[i] & netmask;
	97	}
	98
	99	range->min_addr = new_addr;
	100	range->max_addr = new_addr;
	101	}
	102
eb31628e	103	static void nft_nat_eval(const struct nft_expr *expr,
a55e22e9	104	struct nft_regs *regs,
eb31628e TB	105	const struct nft_pktinfo *pkt)
	106	{
	107	const struct nft_nat *priv = nft_expr_priv(expr);
	108	enum ip_conntrack_info ctinfo;
	109	struct nf_conn *ct = nf_ct_get(pkt->skb, &ctinfo);
2eb0f624	110	struct nf_nat_range2 range;
eb31628e TB	111
eb31628e TB	112	memset(&range, 0, sizeof(range));
3ff7ddb1 PNA	113
3ff7ddb1 PNA	114	if (priv->sreg_addr_min) {
acd766e3	115	nft_nat_setup_addr(&range, regs, priv);
3ff7ddb1 PNA	116	if (priv->flags & NF_NAT_RANGE_NETMAP)
	117	nft_nat_setup_netmap(&range, pkt, priv);
	118	}
eb31628e	119
acd766e3 PNA	120	if (priv->sreg_proto_min)
acd766e3 PNA	121	nft_nat_setup_proto(&range, regs, priv);
eb31628e	122
4566aa44	123	range.flags = priv->flags;
e42eff8a	124
a55e22e9	125	regs->verdict.code = nf_nat_setup_info(ct, &range, priv->type);
eb31628e TB	126	}
	127
	128	static const struct nla_policy nft_nat_policy[NFTA_NAT_MAX + 1] = {
	129	[NFTA_NAT_TYPE] = { .type = NLA_U32 },
	130	[NFTA_NAT_FAMILY] = { .type = NLA_U32 },
	131	[NFTA_NAT_REG_ADDR_MIN] = { .type = NLA_U32 },
	132	[NFTA_NAT_REG_ADDR_MAX] = { .type = NLA_U32 },
	133	[NFTA_NAT_REG_PROTO_MIN] = { .type = NLA_U32 },
	134	[NFTA_NAT_REG_PROTO_MAX] = { .type = NLA_U32 },
e42eff8a	135	[NFTA_NAT_FLAGS] = { .type = NLA_U32 },
eb31628e TB	136	};
eb31628e TB	137
75e8d06d PNA	138	static int nft_nat_validate(const struct nft_ctx *ctx,
	139	const struct nft_expr *expr,
	140	const struct nft_data **data)
eb31628e TB	141	{
	142	struct nft_nat *priv = nft_expr_priv(expr);
	143	int err;
	144
7210e4e3 PNA	145	err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT);
	146	if (err < 0)
	147	return err;
	148
75e8d06d PNA	149	switch (priv->type) {
	150	case NFT_NAT_SNAT:
	151	err = nft_chain_validate_hooks(ctx->chain,
	152	(1 << NF_INET_POST_ROUTING) \|
	153	(1 << NF_INET_LOCAL_IN));
	154	break;
	155	case NFT_NAT_DNAT:
	156	err = nft_chain_validate_hooks(ctx->chain,
	157	(1 << NF_INET_PRE_ROUTING) \|
	158	(1 << NF_INET_LOCAL_OUT));
	159	break;
	160	}
	161
	162	return err;
	163	}
	164
	165	static int nft_nat_init(const struct nft_ctx ctx, const struct nft_expr expr,
	166	const struct nlattr * const tb[])
	167	{
	168	struct nft_nat *priv = nft_expr_priv(expr);
d07db988	169	unsigned int alen, plen;
75e8d06d PNA	170	u32 family;
	171	int err;
	172
5c819a39 PNA	173	if (tb[NFTA_NAT_TYPE] == NULL \|\|
	174	(tb[NFTA_NAT_REG_ADDR_MIN] == NULL &&
	175	tb[NFTA_NAT_REG_PROTO_MIN] == NULL))
eb31628e TB	176	return -EINVAL;
	177
	178	switch (ntohl(nla_get_be32(tb[NFTA_NAT_TYPE]))) {
	179	case NFT_NAT_SNAT:
	180	priv->type = NF_NAT_MANIP_SRC;
	181	break;
	182	case NFT_NAT_DNAT:
	183	priv->type = NF_NAT_MANIP_DST;
	184	break;
	185	default:
0d7c8346	186	return -EOPNOTSUPP;
eb31628e TB	187	}
	188
	189	if (tb[NFTA_NAT_FAMILY] == NULL)
	190	return -EINVAL;
	191
a4c2e8be	192	family = ntohl(nla_get_be32(tb[NFTA_NAT_FAMILY]));
d164385e	193	if (ctx->family != NFPROTO_INET && ctx->family != family)
a4c2e8be	194	return -EOPNOTSUPP;
d07db988 PM	195
	196	switch (family) {
	197	case NFPROTO_IPV4:
c593642c	198	alen = sizeof_field(struct nf_nat_range, min_addr.ip);
d07db988 PM	199	break;
d07db988 PM	200	case NFPROTO_IPV6:
c593642c	201	alen = sizeof_field(struct nf_nat_range, min_addr.ip6);
d07db988 PM	202	break;
	203	default:
	204	return -EAFNOSUPPORT;
	205	}
a4c2e8be	206	priv->family = family;
eb31628e TB	207
eb31628e TB	208	if (tb[NFTA_NAT_REG_ADDR_MIN]) {
61cfac6b	209	priv->sreg_addr_min =
b1c96ed3	210	nft_parse_register(tb[NFTA_NAT_REG_ADDR_MIN]);
d07db988	211	err = nft_validate_register_load(priv->sreg_addr_min, alen);
eb31628e TB	212	if (err < 0)
eb31628e TB	213	return err;
eb31628e	214
61cfac6b PNA	215	if (tb[NFTA_NAT_REG_ADDR_MAX]) {
61cfac6b PNA	216	priv->sreg_addr_max =
b1c96ed3	217	nft_parse_register(tb[NFTA_NAT_REG_ADDR_MAX]);
61cfac6b	218
d07db988 PM	219	err = nft_validate_register_load(priv->sreg_addr_max,
d07db988 PM	220	alen);
61cfac6b PNA	221	if (err < 0)
	222	return err;
	223	} else {
	224	priv->sreg_addr_max = priv->sreg_addr_min;
	225	}
4566aa44 PNA	226
4566aa44 PNA	227	priv->flags \|= NF_NAT_RANGE_MAP_IPS;
61cfac6b	228	}
eb31628e	229
c593642c	230	plen = sizeof_field(struct nf_nat_range, min_addr.all);
eb31628e	231	if (tb[NFTA_NAT_REG_PROTO_MIN]) {
61cfac6b	232	priv->sreg_proto_min =
b1c96ed3	233	nft_parse_register(tb[NFTA_NAT_REG_PROTO_MIN]);
61cfac6b	234
d07db988	235	err = nft_validate_register_load(priv->sreg_proto_min, plen);
eb31628e TB	236	if (err < 0)
eb31628e TB	237	return err;
eb31628e	238
61cfac6b PNA	239	if (tb[NFTA_NAT_REG_PROTO_MAX]) {
61cfac6b PNA	240	priv->sreg_proto_max =
b1c96ed3	241	nft_parse_register(tb[NFTA_NAT_REG_PROTO_MAX]);
61cfac6b	242
d07db988 PM	243	err = nft_validate_register_load(priv->sreg_proto_max,
d07db988 PM	244	plen);
61cfac6b PNA	245	if (err < 0)
	246	return err;
	247	} else {
	248	priv->sreg_proto_max = priv->sreg_proto_min;
	249	}
4566aa44 PNA	250
4566aa44 PNA	251	priv->flags \|= NF_NAT_RANGE_PROTO_SPECIFIED;
61cfac6b	252	}
eb31628e	253
e42eff8a	254	if (tb[NFTA_NAT_FLAGS]) {
4566aa44	255	priv->flags \|= ntohl(nla_get_be32(tb[NFTA_NAT_FLAGS]));
e42eff8a	256	if (priv->flags & ~NF_NAT_RANGE_MASK)
0d7c8346	257	return -EOPNOTSUPP;
e42eff8a AB	258	}
e42eff8a AB	259
20afd423	260	return nf_ct_netns_get(ctx->net, family);
eb31628e TB	261	}
	262
	263	static int nft_nat_dump(struct sk_buff skb, const struct nft_expr expr)
	264	{
	265	const struct nft_nat *priv = nft_expr_priv(expr);
	266
	267	switch (priv->type) {
	268	case NF_NAT_MANIP_SRC:
	269	if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_SNAT)))
	270	goto nla_put_failure;
	271	break;
	272	case NF_NAT_MANIP_DST:
	273	if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_DNAT)))
	274	goto nla_put_failure;
	275	break;
	276	}
	277
	278	if (nla_put_be32(skb, NFTA_NAT_FAMILY, htonl(priv->family)))
	279	goto nla_put_failure;
1e2d56a5 PNA	280
1e2d56a5 PNA	281	if (priv->sreg_addr_min) {
b1c96ed3 PM	282	if (nft_dump_register(skb, NFTA_NAT_REG_ADDR_MIN,
	283	priv->sreg_addr_min) \|\|
	284	nft_dump_register(skb, NFTA_NAT_REG_ADDR_MAX,
	285	priv->sreg_addr_max))
1e2d56a5 PNA	286	goto nla_put_failure;
	287	}
	288
91513606	289	if (priv->sreg_proto_min) {
b1c96ed3 PM	290	if (nft_dump_register(skb, NFTA_NAT_REG_PROTO_MIN,
	291	priv->sreg_proto_min) \|\|
	292	nft_dump_register(skb, NFTA_NAT_REG_PROTO_MAX,
	293	priv->sreg_proto_max))
91513606 PNA	294	goto nla_put_failure;
91513606 PNA	295	}
e42eff8a AB	296
	297	if (priv->flags != 0) {
	298	if (nla_put_be32(skb, NFTA_NAT_FLAGS, htonl(priv->flags)))
	299	goto nla_put_failure;
	300	}
	301
eb31628e TB	302	return 0;
	303
	304	nla_put_failure:
	305	return -1;
	306	}
	307
20afd423 FW	308	static void
	309	nft_nat_destroy(const struct nft_ctx ctx, const struct nft_expr expr)
	310	{
	311	const struct nft_nat *priv = nft_expr_priv(expr);
	312
	313	nf_ct_netns_put(ctx->net, priv->family);
	314	}
	315
eb31628e TB	316	static struct nft_expr_type nft_nat_type;
	317	static const struct nft_expr_ops nft_nat_ops = {
	318	.type = &nft_nat_type,
	319	.size = NFT_EXPR_SIZE(sizeof(struct nft_nat)),
	320	.eval = nft_nat_eval,
	321	.init = nft_nat_init,
20afd423	322	.destroy = nft_nat_destroy,
eb31628e	323	.dump = nft_nat_dump,
7210e4e3	324	.validate = nft_nat_validate,
eb31628e TB	325	};
	326
	327	static struct nft_expr_type nft_nat_type __read_mostly = {
	328	.name = "nat",
	329	.ops = &nft_nat_ops,
	330	.policy = nft_nat_policy,
	331	.maxattr = NFTA_NAT_MAX,
	332	.owner = THIS_MODULE,
	333	};
	334
d164385e FW	335	#ifdef CONFIG_NF_TABLES_INET
	336	static void nft_nat_inet_eval(const struct nft_expr *expr,
	337	struct nft_regs *regs,
	338	const struct nft_pktinfo *pkt)
	339	{
	340	const struct nft_nat *priv = nft_expr_priv(expr);
	341
	342	if (priv->family == nft_pf(pkt))
	343	nft_nat_eval(expr, regs, pkt);
	344	}
	345
	346	static const struct nft_expr_ops nft_nat_inet_ops = {
	347	.type = &nft_nat_type,
	348	.size = NFT_EXPR_SIZE(sizeof(struct nft_nat)),
	349	.eval = nft_nat_inet_eval,
	350	.init = nft_nat_init,
	351	.destroy = nft_nat_destroy,
	352	.dump = nft_nat_dump,
	353	.validate = nft_nat_validate,
	354	};
	355
	356	static struct nft_expr_type nft_inet_nat_type __read_mostly = {
	357	.name = "nat",
	358	.family = NFPROTO_INET,
	359	.ops = &nft_nat_inet_ops,
	360	.policy = nft_nat_policy,
	361	.maxattr = NFTA_NAT_MAX,
	362	.owner = THIS_MODULE,
	363	};
	364
	365	static int nft_nat_inet_module_init(void)
	366	{
	367	return nft_register_expr(&nft_inet_nat_type);
	368	}
	369
	370	static void nft_nat_inet_module_exit(void)
	371	{
	372	nft_unregister_expr(&nft_inet_nat_type);
	373	}
	374	#else
	375	static int nft_nat_inet_module_init(void) { return 0; }
	376	static void nft_nat_inet_module_exit(void) { }
	377	#endif
	378
eb31628e TB	379	static int __init nft_nat_module_init(void)
eb31628e TB	380	{
d164385e FW	381	int ret = nft_nat_inet_module_init();
	382
	383	if (ret)
	384	return ret;
	385
	386	ret = nft_register_expr(&nft_nat_type);
	387	if (ret)
	388	nft_nat_inet_module_exit();
	389
	390	return ret;
eb31628e TB	391	}
	392
	393	static void __exit nft_nat_module_exit(void)
	394	{
d164385e	395	nft_nat_inet_module_exit();
eb31628e TB	396	nft_unregister_expr(&nft_nat_type);
	397	}
	398
	399	module_init(nft_nat_module_init);
	400	module_exit(nft_nat_module_exit);
	401
	402	MODULE_LICENSE("GPL");
	403	MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
	404	MODULE_ALIAS_NFT_EXPR("nat");
4cacc395	405	MODULE_DESCRIPTION("Network Address Translation support");