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

/*
 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
 * Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>
 * Copyright (c) 2012 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 */

#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_nat_core.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_nat_l3proto.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;
};

static void nft_nat_eval(const struct nft_expr *expr,
			 struct nft_data data[NFT_REG_MAX + 1],
			 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_range range;

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

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

	if (priv->sreg_proto_min) {
		range.min_proto.all = (__force __be16)
					data[priv->sreg_proto_min].data[0];
		range.max_proto.all = (__force __be16)
					data[priv->sreg_proto_max].data[0];
		range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
	}

	data[NFT_REG_VERDICT].verdict =
		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 },
};

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);
	u32 family;
	int err;

	if (tb[NFTA_NAT_TYPE] == 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 (family != AF_INET && family != AF_INET6)
		return -EAFNOSUPPORT;
	if (family != ctx->afi->family)
		return -EOPNOTSUPP;
	priv->family = family;

	if (tb[NFTA_NAT_REG_ADDR_MIN]) {
		priv->sreg_addr_min = ntohl(nla_get_be32(
						tb[NFTA_NAT_REG_ADDR_MIN]));
		err = nft_validate_input_register(priv->sreg_addr_min);
		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]));
		err = nft_validate_input_register(priv->sreg_addr_max);
		if (err < 0)
			return err;
	} else
		priv->sreg_addr_max = priv->sreg_addr_min;

	if (tb[NFTA_NAT_REG_PROTO_MIN]) {
		priv->sreg_proto_min = ntohl(nla_get_be32(
						tb[NFTA_NAT_REG_PROTO_MIN]));
		err = nft_validate_input_register(priv->sreg_proto_min);
		if (err < 0)
			return err;
	}

	if (tb[NFTA_NAT_REG_PROTO_MAX]) {
		priv->sreg_proto_max = ntohl(nla_get_be32(
						tb[NFTA_NAT_REG_PROTO_MAX]));
		err = nft_validate_input_register(priv->sreg_proto_max);
		if (err < 0)
			return err;
	} else
		priv->sreg_proto_max = priv->sreg_proto_min;

	return 0;
}

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 (nla_put_be32(skb,
			 NFTA_NAT_REG_ADDR_MIN, htonl(priv->sreg_addr_min)))
		goto nla_put_failure;
	if (nla_put_be32(skb,
			 NFTA_NAT_REG_ADDR_MAX, htonl(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)))
			goto nla_put_failure;
		if (nla_put_be32(skb, NFTA_NAT_REG_PROTO_MAX,
				 htonl(priv->sreg_proto_max)))
			goto nla_put_failure;
	}
	return 0;

nla_put_failure:
	return -1;
}

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,
	.dump           = nft_nat_dump,
};

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,
};

static int __init nft_nat_module_init(void)
{
	return nft_register_expr(&nft_nat_type);
}

static void __exit nft_nat_module_exit(void)
{
	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
eb31628e TB	1	/*
	2	* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
	3	* Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>
	4	* Copyright (c) 2012 Intel Corporation
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms and conditions of the GNU General Public License,
	8	* version 2, as published by the Free Software Foundation.
	9	*
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/init.h>
	14	#include <linux/skbuff.h>
	15	#include <linux/ip.h>
	16	#include <linux/string.h>
	17	#include <linux/netlink.h>
	18	#include <linux/netfilter.h>
	19	#include <linux/netfilter_ipv4.h>
	20	#include <linux/netfilter/nfnetlink.h>
	21	#include <linux/netfilter/nf_tables.h>
	22	#include <net/netfilter/nf_conntrack.h>
	23	#include <net/netfilter/nf_nat.h>
	24	#include <net/netfilter/nf_nat_core.h>
	25	#include <net/netfilter/nf_tables.h>
	26	#include <net/netfilter/nf_nat_l3proto.h>
	27	#include <net/ip.h>
	28
	29	struct nft_nat {
	30	enum nft_registers sreg_addr_min:8;
	31	enum nft_registers sreg_addr_max:8;
	32	enum nft_registers sreg_proto_min:8;
	33	enum nft_registers sreg_proto_max:8;
a4c2e8be PM	34	enum nf_nat_manip_type type:8;
a4c2e8be PM	35	u8 family;
eb31628e TB	36	};
	37
	38	static void nft_nat_eval(const struct nft_expr *expr,
	39	struct nft_data data[NFT_REG_MAX + 1],
	40	const struct nft_pktinfo *pkt)
	41	{
	42	const struct nft_nat *priv = nft_expr_priv(expr);
	43	enum ip_conntrack_info ctinfo;
	44	struct nf_conn *ct = nf_ct_get(pkt->skb, &ctinfo);
	45	struct nf_nat_range range;
	46
	47	memset(&range, 0, sizeof(range));
	48	if (priv->sreg_addr_min) {
	49	if (priv->family == AF_INET) {
98c37b6b TB	50	range.min_addr.ip = (__force __be32)
	51	data[priv->sreg_addr_min].data[0];
	52	range.max_addr.ip = (__force __be32)
	53	data[priv->sreg_addr_max].data[0];
eb31628e TB	54
	55	} else {
	56	memcpy(range.min_addr.ip6,
	57	data[priv->sreg_addr_min].data,
	58	sizeof(struct nft_data));
	59	memcpy(range.max_addr.ip6,
	60	data[priv->sreg_addr_max].data,
	61	sizeof(struct nft_data));
	62	}
	63	range.flags \|= NF_NAT_RANGE_MAP_IPS;
	64	}
	65
	66	if (priv->sreg_proto_min) {
98c37b6b TB	67	range.min_proto.all = (__force __be16)
	68	data[priv->sreg_proto_min].data[0];
	69	range.max_proto.all = (__force __be16)
	70	data[priv->sreg_proto_max].data[0];
eb31628e TB	71	range.flags \|= NF_NAT_RANGE_PROTO_SPECIFIED;
	72	}
	73
	74	data[NFT_REG_VERDICT].verdict =
	75	nf_nat_setup_info(ct, &range, priv->type);
	76	}
	77
	78	static const struct nla_policy nft_nat_policy[NFTA_NAT_MAX + 1] = {
	79	[NFTA_NAT_TYPE] = { .type = NLA_U32 },
	80	[NFTA_NAT_FAMILY] = { .type = NLA_U32 },
	81	[NFTA_NAT_REG_ADDR_MIN] = { .type = NLA_U32 },
	82	[NFTA_NAT_REG_ADDR_MAX] = { .type = NLA_U32 },
	83	[NFTA_NAT_REG_PROTO_MIN] = { .type = NLA_U32 },
	84	[NFTA_NAT_REG_PROTO_MAX] = { .type = NLA_U32 },
	85	};
	86
	87	static int nft_nat_init(const struct nft_ctx ctx, const struct nft_expr expr,
	88	const struct nlattr * const tb[])
	89	{
	90	struct nft_nat *priv = nft_expr_priv(expr);
a4c2e8be	91	u32 family;
eb31628e TB	92	int err;
	93
	94	if (tb[NFTA_NAT_TYPE] == NULL)
	95	return -EINVAL;
	96
	97	switch (ntohl(nla_get_be32(tb[NFTA_NAT_TYPE]))) {
	98	case NFT_NAT_SNAT:
	99	priv->type = NF_NAT_MANIP_SRC;
	100	break;
	101	case NFT_NAT_DNAT:
	102	priv->type = NF_NAT_MANIP_DST;
	103	break;
	104	default:
	105	return -EINVAL;
	106	}
	107
	108	if (tb[NFTA_NAT_FAMILY] == NULL)
	109	return -EINVAL;
	110
a4c2e8be PM	111	family = ntohl(nla_get_be32(tb[NFTA_NAT_FAMILY]));
	112	if (family != AF_INET && family != AF_INET6)
	113	return -EAFNOSUPPORT;
	114	if (family != ctx->afi->family)
	115	return -EOPNOTSUPP;
	116	priv->family = family;
eb31628e TB	117
	118	if (tb[NFTA_NAT_REG_ADDR_MIN]) {
	119	priv->sreg_addr_min = ntohl(nla_get_be32(
	120	tb[NFTA_NAT_REG_ADDR_MIN]));
	121	err = nft_validate_input_register(priv->sreg_addr_min);
	122	if (err < 0)
	123	return err;
	124	}
	125
	126	if (tb[NFTA_NAT_REG_ADDR_MAX]) {
	127	priv->sreg_addr_max = ntohl(nla_get_be32(
	128	tb[NFTA_NAT_REG_ADDR_MAX]));
	129	err = nft_validate_input_register(priv->sreg_addr_max);
	130	if (err < 0)
	131	return err;
	132	} else
	133	priv->sreg_addr_max = priv->sreg_addr_min;
	134
	135	if (tb[NFTA_NAT_REG_PROTO_MIN]) {
	136	priv->sreg_proto_min = ntohl(nla_get_be32(
	137	tb[NFTA_NAT_REG_PROTO_MIN]));
	138	err = nft_validate_input_register(priv->sreg_proto_min);
	139	if (err < 0)
	140	return err;
	141	}
	142
	143	if (tb[NFTA_NAT_REG_PROTO_MAX]) {
	144	priv->sreg_proto_max = ntohl(nla_get_be32(
	145	tb[NFTA_NAT_REG_PROTO_MAX]));
	146	err = nft_validate_input_register(priv->sreg_proto_max);
	147	if (err < 0)
	148	return err;
	149	} else
	150	priv->sreg_proto_max = priv->sreg_proto_min;
	151
	152	return 0;
	153	}
	154
	155	static int nft_nat_dump(struct sk_buff skb, const struct nft_expr expr)
	156	{
	157	const struct nft_nat *priv = nft_expr_priv(expr);
	158
	159	switch (priv->type) {
	160	case NF_NAT_MANIP_SRC:
	161	if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_SNAT)))
	162	goto nla_put_failure;
	163	break;
	164	case NF_NAT_MANIP_DST:
	165	if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_DNAT)))
	166	goto nla_put_failure;
	167	break;
	168	}
	169
	170	if (nla_put_be32(skb, NFTA_NAT_FAMILY, htonl(priv->family)))
	171	goto nla_put_failure;
	172	if (nla_put_be32(skb,
	173	NFTA_NAT_REG_ADDR_MIN, htonl(priv->sreg_addr_min)))
	174	goto nla_put_failure;
	175	if (nla_put_be32(skb,
	176	NFTA_NAT_REG_ADDR_MAX, htonl(priv->sreg_addr_max)))
	177	goto nla_put_failure;
91513606 PNA	178	if (priv->sreg_proto_min) {
	179	if (nla_put_be32(skb, NFTA_NAT_REG_PROTO_MIN,
	180	htonl(priv->sreg_proto_min)))
	181	goto nla_put_failure;
	182	if (nla_put_be32(skb, NFTA_NAT_REG_PROTO_MAX,
	183	htonl(priv->sreg_proto_max)))
	184	goto nla_put_failure;
	185	}
eb31628e TB	186	return 0;
	187
	188	nla_put_failure:
	189	return -1;
	190	}
	191
	192	static struct nft_expr_type nft_nat_type;
	193	static const struct nft_expr_ops nft_nat_ops = {
	194	.type = &nft_nat_type,
	195	.size = NFT_EXPR_SIZE(sizeof(struct nft_nat)),
	196	.eval = nft_nat_eval,
	197	.init = nft_nat_init,
	198	.dump = nft_nat_dump,
	199	};
	200
	201	static struct nft_expr_type nft_nat_type __read_mostly = {
	202	.name = "nat",
	203	.ops = &nft_nat_ops,
	204	.policy = nft_nat_policy,
	205	.maxattr = NFTA_NAT_MAX,
	206	.owner = THIS_MODULE,
	207	};
	208
	209	static int __init nft_nat_module_init(void)
	210	{
a4c2e8be	211	return nft_register_expr(&nft_nat_type);
eb31628e TB	212	}
	213
	214	static void __exit nft_nat_module_exit(void)
	215	{
	216	nft_unregister_expr(&nft_nat_type);
	217	}
	218
	219	module_init(nft_nat_module_init);
	220	module_exit(nft_nat_module_exit);
	221
	222	MODULE_LICENSE("GPL");
	223	MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
	224	MODULE_ALIAS_NFT_EXPR("nat");