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

/*
 * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nft_redir.h>

const struct nla_policy nft_redir_policy[NFTA_REDIR_MAX + 1] = {
	[NFTA_REDIR_REG_PROTO_MIN]	= { .type = NLA_U32 },
	[NFTA_REDIR_REG_PROTO_MAX]	= { .type = NLA_U32 },
	[NFTA_REDIR_FLAGS]		= { .type = NLA_U32 },
};
EXPORT_SYMBOL_GPL(nft_redir_policy);

int nft_redir_validate(const struct nft_ctx *ctx,
		       const struct nft_expr *expr,
		       const struct nft_data **data)
{
	int err;

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

	return nft_chain_validate_hooks(ctx->chain,
					(1 << NF_INET_PRE_ROUTING) |
					(1 << NF_INET_LOCAL_OUT));
}
EXPORT_SYMBOL_GPL(nft_redir_validate);

int nft_redir_init(const struct nft_ctx *ctx,
		   const struct nft_expr *expr,
		   const struct nlattr * const tb[])
{
	struct nft_redir *priv = nft_expr_priv(expr);
	unsigned int plen;
	int err;

	err = nft_redir_validate(ctx, expr, NULL);
	if (err < 0)
		return err;

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

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

		if (tb[NFTA_REDIR_REG_PROTO_MAX]) {
			priv->sreg_proto_max =
				nft_parse_register(tb[NFTA_REDIR_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_REDIR_FLAGS]) {
		priv->flags = ntohl(nla_get_be32(tb[NFTA_REDIR_FLAGS]));
		if (priv->flags & ~NF_NAT_RANGE_MASK)
			return -EINVAL;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(nft_redir_init);

int nft_redir_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
	const struct nft_redir *priv = nft_expr_priv(expr);

	if (priv->sreg_proto_min) {
		if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MIN,
				      priv->sreg_proto_min))
			goto nla_put_failure;
		if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MAX,
				      priv->sreg_proto_max))
			goto nla_put_failure;
	}

	if (priv->flags != 0 &&
	    nla_put_be32(skb, NFTA_REDIR_FLAGS, htonl(priv->flags)))
			goto nla_put_failure;

	return 0;

nla_put_failure:
	return -1;
}
EXPORT_SYMBOL_GPL(nft_redir_dump);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>");
Commit	Line	Data
e9105f1b AB	1	/*
	2	* Copyright (c) 2014 Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*/
	8
	9	#include <linux/kernel.h>
	10	#include <linux/init.h>
	11	#include <linux/module.h>
	12	#include <linux/netlink.h>
	13	#include <linux/netfilter.h>
	14	#include <linux/netfilter/nf_tables.h>
	15	#include <net/netfilter/nf_nat.h>
	16	#include <net/netfilter/nf_tables.h>
	17	#include <net/netfilter/nft_redir.h>
	18
	19	const struct nla_policy nft_redir_policy[NFTA_REDIR_MAX + 1] = {
	20	[NFTA_REDIR_REG_PROTO_MIN] = { .type = NLA_U32 },
	21	[NFTA_REDIR_REG_PROTO_MAX] = { .type = NLA_U32 },
	22	[NFTA_REDIR_FLAGS] = { .type = NLA_U32 },
	23	};
	24	EXPORT_SYMBOL_GPL(nft_redir_policy);
	25
75e8d06d PNA	26	int nft_redir_validate(const struct nft_ctx *ctx,
	27	const struct nft_expr *expr,
	28	const struct nft_data **data)
	29	{
	30	int err;
	31
	32	err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT);
	33	if (err < 0)
	34	return err;
	35
	36	return nft_chain_validate_hooks(ctx->chain,
	37	(1 << NF_INET_PRE_ROUTING) \|
	38	(1 << NF_INET_LOCAL_OUT));
	39	}
	40	EXPORT_SYMBOL_GPL(nft_redir_validate);
	41
e9105f1b AB	42	int nft_redir_init(const struct nft_ctx *ctx,
	43	const struct nft_expr *expr,
	44	const struct nlattr * const tb[])
	45	{
	46	struct nft_redir *priv = nft_expr_priv(expr);
d07db988	47	unsigned int plen;
e9105f1b AB	48	int err;
e9105f1b AB	49
75e8d06d	50	err = nft_redir_validate(ctx, expr, NULL);
e9105f1b AB	51	if (err < 0)
	52	return err;
	53
d07db988	54	plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all);
e9105f1b	55	if (tb[NFTA_REDIR_REG_PROTO_MIN]) {
baf4750d	56	priv->sreg_proto_min =
b1c96ed3	57	nft_parse_register(tb[NFTA_REDIR_REG_PROTO_MIN]);
baf4750d	58
d07db988	59	err = nft_validate_register_load(priv->sreg_proto_min, plen);
e9105f1b AB	60	if (err < 0)
	61	return err;
	62
	63	if (tb[NFTA_REDIR_REG_PROTO_MAX]) {
baf4750d	64	priv->sreg_proto_max =
b1c96ed3	65	nft_parse_register(tb[NFTA_REDIR_REG_PROTO_MAX]);
baf4750d	66
d07db988 PM	67	err = nft_validate_register_load(priv->sreg_proto_max,
d07db988 PM	68	plen);
e9105f1b AB	69	if (err < 0)
	70	return err;
	71	} else {
	72	priv->sreg_proto_max = priv->sreg_proto_min;
	73	}
	74	}
	75
	76	if (tb[NFTA_REDIR_FLAGS]) {
	77	priv->flags = ntohl(nla_get_be32(tb[NFTA_REDIR_FLAGS]));
	78	if (priv->flags & ~NF_NAT_RANGE_MASK)
	79	return -EINVAL;
	80	}
	81
	82	return 0;
	83	}
	84	EXPORT_SYMBOL_GPL(nft_redir_init);
	85
	86	int nft_redir_dump(struct sk_buff skb, const struct nft_expr expr)
	87	{
	88	const struct nft_redir *priv = nft_expr_priv(expr);
	89
	90	if (priv->sreg_proto_min) {
b1c96ed3 PM	91	if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MIN,
b1c96ed3 PM	92	priv->sreg_proto_min))
e9105f1b	93	goto nla_put_failure;
b1c96ed3 PM	94	if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MAX,
b1c96ed3 PM	95	priv->sreg_proto_max))
e9105f1b AB	96	goto nla_put_failure;
	97	}
	98
	99	if (priv->flags != 0 &&
	100	nla_put_be32(skb, NFTA_REDIR_FLAGS, htonl(priv->flags)))
	101	goto nla_put_failure;
	102
	103	return 0;
	104
	105	nla_put_failure:
	106	return -1;
	107	}
	108	EXPORT_SYMBOL_GPL(nft_redir_dump);
	109
e9105f1b AB	110	MODULE_LICENSE("GPL");
e9105f1b AB	111	MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>");