[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 = data[priv->sreg_addr_min].data[0];
			range.max_addr.ip = 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 = data[priv->sreg_proto_min].data[0];
		range.max_proto.all = 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) {
	50	range.min_addr.ip = data[priv->sreg_addr_min].data[0];
	51	range.max_addr.ip = data[priv->sreg_addr_max].data[0];
	52
	53	} else {
	54	memcpy(range.min_addr.ip6,
	55	data[priv->sreg_addr_min].data,
	56	sizeof(struct nft_data));
	57	memcpy(range.max_addr.ip6,
	58	data[priv->sreg_addr_max].data,
	59	sizeof(struct nft_data));
	60	}
	61	range.flags \|= NF_NAT_RANGE_MAP_IPS;
	62	}
	63
	64	if (priv->sreg_proto_min) {
65	range.min_proto.all = data[priv->sreg_proto_min].data[0];
66	range.max_proto.all = data[priv->sreg_proto_max].data[0];
67	range.flags \|= NF_NAT_RANGE_PROTO_SPECIFIED;
68	}
69
70	data[NFT_REG_VERDICT].verdict =
71	nf_nat_setup_info(ct, &range, priv->type);
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 },
81	};
82
83	static int nft_nat_init(const struct nft_ctx ctx, const struct nft_expr expr,
84	const struct nlattr * const tb[])
85	{
86	struct nft_nat *priv = nft_expr_priv(expr);
87	int err;
88
89	if (tb[NFTA_NAT_TYPE] == NULL)
90	return -EINVAL;
91
92	switch (ntohl(nla_get_be32(tb[NFTA_NAT_TYPE]))) {
93	case NFT_NAT_SNAT:
94	priv->type = NF_NAT_MANIP_SRC;
95	break;
96	case NFT_NAT_DNAT:
97	priv->type = NF_NAT_MANIP_DST;
98	break;
99	default:
100	return -EINVAL;
101	}
102
103	if (tb[NFTA_NAT_FAMILY] == NULL)
104	return -EINVAL;
105
106	priv->family = ntohl(nla_get_be32(tb[NFTA_NAT_FAMILY]));
107	if (priv->family != AF_INET && priv->family != AF_INET6)
108	return -EINVAL;
109
110	if (tb[NFTA_NAT_REG_ADDR_MIN]) {
111	priv->sreg_addr_min = ntohl(nla_get_be32(
112	tb[NFTA_NAT_REG_ADDR_MIN]));
113	err = nft_validate_input_register(priv->sreg_addr_min);
114	if (err < 0)
115	return err;
116	}
117
118	if (tb[NFTA_NAT_REG_ADDR_MAX]) {
119	priv->sreg_addr_max = ntohl(nla_get_be32(
120	tb[NFTA_NAT_REG_ADDR_MAX]));
121	err = nft_validate_input_register(priv->sreg_addr_max);
122	if (err < 0)
123	return err;
124	} else
125	priv->sreg_addr_max = priv->sreg_addr_min;
126
127	if (tb[NFTA_NAT_REG_PROTO_MIN]) {
128	priv->sreg_proto_min = ntohl(nla_get_be32(
129	tb[NFTA_NAT_REG_PROTO_MIN]));
130	err = nft_validate_input_register(priv->sreg_proto_min);
131	if (err < 0)
132	return err;
133	}
134
135	if (tb[NFTA_NAT_REG_PROTO_MAX]) {
136	priv->sreg_proto_max = ntohl(nla_get_be32(
137	tb[NFTA_NAT_REG_PROTO_MAX]));
138	err = nft_validate_input_register(priv->sreg_proto_max);
139	if (err < 0)
140	return err;
141	} else
142	priv->sreg_proto_max = priv->sreg_proto_min;
143
144	return 0;
145	}
146
147	static int nft_nat_dump(struct sk_buff skb, const struct nft_expr expr)
148	{
149	const struct nft_nat *priv = nft_expr_priv(expr);
150
151	switch (priv->type) {
152	case NF_NAT_MANIP_SRC:
153	if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_SNAT)))
154	goto nla_put_failure;
155	break;
156	case NF_NAT_MANIP_DST:
157	if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_DNAT)))
158	goto nla_put_failure;
159	break;
160	}
161
162	if (nla_put_be32(skb, NFTA_NAT_FAMILY, htonl(priv->family)))
163	goto nla_put_failure;
164	if (nla_put_be32(skb,
165	NFTA_NAT_REG_ADDR_MIN, htonl(priv->sreg_addr_min)))
166	goto nla_put_failure;
167	if (nla_put_be32(skb,
168	NFTA_NAT_REG_ADDR_MAX, htonl(priv->sreg_addr_max)))
169	goto nla_put_failure;
170	if (nla_put_be32(skb,
171	NFTA_NAT_REG_PROTO_MIN, htonl(priv->sreg_proto_min)))
172	goto nla_put_failure;
173	if (nla_put_be32(skb,
174	NFTA_NAT_REG_PROTO_MAX, htonl(priv->sreg_proto_max)))
175	goto nla_put_failure;
176	return 0;
177
178	nla_put_failure:
179	return -1;
180	}
181
182	static struct nft_expr_type nft_nat_type;
183	static const struct nft_expr_ops nft_nat_ops = {
184	.type = &nft_nat_type,
185	.size = NFT_EXPR_SIZE(sizeof(struct nft_nat)),
186	.eval = nft_nat_eval,
187	.init = nft_nat_init,
188	.dump = nft_nat_dump,
189	};
190
191	static struct nft_expr_type nft_nat_type __read_mostly = {
192	.name = "nat",
193	.ops = &nft_nat_ops,
194	.policy = nft_nat_policy,
195	.maxattr = NFTA_NAT_MAX,
196	.owner = THIS_MODULE,
197	};
198
199	static int __init nft_nat_module_init(void)
200	{
201	int err;
202
203	err = nft_register_expr(&nft_nat_type);
204	if (err < 0)
205	return err;
206
207	return 0;
208	}
209
210	static void __exit nft_nat_module_exit(void)
211	{
212	nft_unregister_expr(&nft_nat_type);
213	}
214
215	module_init(nft_nat_module_init);
216	module_exit(nft_nat_module_exit);
217
218	MODULE_LICENSE("GPL");
219	MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
220	MODULE_ALIAS_NFT_EXPR("nat");