[deliverable/linux.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;
	int                     family;
	enum nf_nat_manip_type  type;
};

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);
	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;

	priv->family = ntohl(nla_get_be32(tb[NFTA_NAT_FAMILY]));
	if (priv->family != AF_INET && priv->family != AF_INET6)
		return -EINVAL;

	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 (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)
{
	int err;

	err = nft_register_expr(&nft_nat_type);
	if (err < 0)
		return err;

	return 0;
}

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;
	34	int family;
	35	enum nf_nat_manip_type type;
	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);
	91	int err;
	92
	93	if (tb[NFTA_NAT_TYPE] == NULL)
	94	return -EINVAL;
	95
	96	switch (ntohl(nla_get_be32(tb[NFTA_NAT_TYPE]))) {
	97	case NFT_NAT_SNAT:
	98	priv->type = NF_NAT_MANIP_SRC;
	99	break;
	100	case NFT_NAT_DNAT:
	101	priv->type = NF_NAT_MANIP_DST;
	102	break;
	103	default:
	104	return -EINVAL;
	105	}
	106
	107	if (tb[NFTA_NAT_FAMILY] == NULL)
	108	return -EINVAL;
	109
	110	priv->family = ntohl(nla_get_be32(tb[NFTA_NAT_FAMILY]));
	111	if (priv->family != AF_INET && priv->family != AF_INET6)
	112	return -EINVAL;
	113
	114	if (tb[NFTA_NAT_REG_ADDR_MIN]) {
	115	priv->sreg_addr_min = ntohl(nla_get_be32(
	116	tb[NFTA_NAT_REG_ADDR_MIN]));
	117	err = nft_validate_input_register(priv->sreg_addr_min);
	118	if (err < 0)
	119	return err;
	120	}
	121
	122	if (tb[NFTA_NAT_REG_ADDR_MAX]) {
	123	priv->sreg_addr_max = ntohl(nla_get_be32(
	124	tb[NFTA_NAT_REG_ADDR_MAX]));
	125	err = nft_validate_input_register(priv->sreg_addr_max);
	126	if (err < 0)
	127	return err;
	128	} else
	129	priv->sreg_addr_max = priv->sreg_addr_min;
	130
	131	if (tb[NFTA_NAT_REG_PROTO_MIN]) {
	132	priv->sreg_proto_min = ntohl(nla_get_be32(
	133	tb[NFTA_NAT_REG_PROTO_MIN]));
	134	err = nft_validate_input_register(priv->sreg_proto_min);
135	if (err < 0)
136	return err;
137	}
138
139	if (tb[NFTA_NAT_REG_PROTO_MAX]) {
140	priv->sreg_proto_max = ntohl(nla_get_be32(
141	tb[NFTA_NAT_REG_PROTO_MAX]));
142	err = nft_validate_input_register(priv->sreg_proto_max);
143	if (err < 0)
144	return err;
145	} else
146	priv->sreg_proto_max = priv->sreg_proto_min;
147
148	return 0;
149	}
150
151	static int nft_nat_dump(struct sk_buff skb, const struct nft_expr expr)
152	{
153	const struct nft_nat *priv = nft_expr_priv(expr);
154
155	switch (priv->type) {
156	case NF_NAT_MANIP_SRC:
157	if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_SNAT)))
158	goto nla_put_failure;
159	break;
160	case NF_NAT_MANIP_DST:
161	if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_DNAT)))
162	goto nla_put_failure;
163	break;
164	}
165
166	if (nla_put_be32(skb, NFTA_NAT_FAMILY, htonl(priv->family)))
167	goto nla_put_failure;
168	if (nla_put_be32(skb,
169	NFTA_NAT_REG_ADDR_MIN, htonl(priv->sreg_addr_min)))
170	goto nla_put_failure;
171	if (nla_put_be32(skb,
172	NFTA_NAT_REG_ADDR_MAX, htonl(priv->sreg_addr_max)))
173	goto nla_put_failure;
174	if (nla_put_be32(skb,
175	NFTA_NAT_REG_PROTO_MIN, htonl(priv->sreg_proto_min)))
176	goto nla_put_failure;
177	if (nla_put_be32(skb,
178	NFTA_NAT_REG_PROTO_MAX, htonl(priv->sreg_proto_max)))
179	goto nla_put_failure;
180	return 0;
181
182	nla_put_failure:
183	return -1;
184	}
185
186	static struct nft_expr_type nft_nat_type;
187	static const struct nft_expr_ops nft_nat_ops = {
188	.type = &nft_nat_type,
189	.size = NFT_EXPR_SIZE(sizeof(struct nft_nat)),
190	.eval = nft_nat_eval,
191	.init = nft_nat_init,
192	.dump = nft_nat_dump,
193	};
194
195	static struct nft_expr_type nft_nat_type __read_mostly = {
196	.name = "nat",
197	.ops = &nft_nat_ops,
198	.policy = nft_nat_policy,
199	.maxattr = NFTA_NAT_MAX,
200	.owner = THIS_MODULE,
201	};
202
203	static int __init nft_nat_module_init(void)
204	{
205	int err;
206
207	err = nft_register_expr(&nft_nat_type);
208	if (err < 0)
209	return err;
210
211	return 0;
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");