[mirror_ubuntu-artful-kernel.git] / net / ipv6 / netfilter / nft_masq_ipv6.c

/*
 * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo@debian.org>
 *
 * 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_tables.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nft_masq.h>
#include <net/netfilter/ipv6/nf_nat_masquerade.h>

static void nft_masq_ipv6_eval(const struct nft_expr *expr,
			       struct nft_regs *regs,
			       const struct nft_pktinfo *pkt)
{
	struct nft_masq *priv = nft_expr_priv(expr);
	struct nf_nat_range range;

	memset(&range, 0, sizeof(range));
	range.flags = priv->flags;
	if (priv->sreg_proto_min) {
		range.min_proto.all =
			*(__be16 *)&regs->data[priv->sreg_proto_min];
		range.max_proto.all =
			*(__be16 *)&regs->data[priv->sreg_proto_max];
	}
	regs->verdict.code = nf_nat_masquerade_ipv6(pkt->skb, &range,
						    nft_out(pkt));
}

static void
nft_masq_ipv6_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
{
	nf_ct_netns_put(ctx->net, NFPROTO_IPV6);
}

static struct nft_expr_type nft_masq_ipv6_type;
static const struct nft_expr_ops nft_masq_ipv6_ops = {
	.type		= &nft_masq_ipv6_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_masq)),
	.eval		= nft_masq_ipv6_eval,
	.init		= nft_masq_init,
	.destroy	= nft_masq_ipv6_destroy,
	.dump		= nft_masq_dump,
	.validate	= nft_masq_validate,
};

static struct nft_expr_type nft_masq_ipv6_type __read_mostly = {
	.family		= NFPROTO_IPV6,
	.name		= "masq",
	.ops		= &nft_masq_ipv6_ops,
	.policy		= nft_masq_policy,
	.maxattr	= NFTA_MASQ_MAX,
	.owner		= THIS_MODULE,
};

static int __init nft_masq_ipv6_module_init(void)
{
	int ret;

	ret = nft_register_expr(&nft_masq_ipv6_type);
	if (ret < 0)
		return ret;

	nf_nat_masquerade_ipv6_register_notifier();

	return ret;
}

static void __exit nft_masq_ipv6_module_exit(void)
{
	nft_unregister_expr(&nft_masq_ipv6_type);
	nf_nat_masquerade_ipv6_unregister_notifier();
}

module_init(nft_masq_ipv6_module_init);
module_exit(nft_masq_ipv6_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org>");
MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "masq");
Commit	Line	Data
9ba1f726	1	/*
cd727514	2	* Copyright (c) 2014 Arturo Borrero Gonzalez <arturo@debian.org>
9ba1f726 AB	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_tables.h>
	16	#include <net/netfilter/nf_nat.h>
	17	#include <net/netfilter/nft_masq.h>
	18	#include <net/netfilter/ipv6/nf_nat_masquerade.h>
	19
	20	static void nft_masq_ipv6_eval(const struct nft_expr *expr,
a55e22e9	21	struct nft_regs *regs,
9ba1f726 AB	22	const struct nft_pktinfo *pkt)
	23	{
	24	struct nft_masq *priv = nft_expr_priv(expr);
	25	struct nf_nat_range range;
9ba1f726	26
6b96686e	27	memset(&range, 0, sizeof(range));
9ba1f726	28	range.flags = priv->flags;
8a6bf5da PNA	29	if (priv->sreg_proto_min) {
	30	range.min_proto.all =
	31	(__be16 )&regs->data[priv->sreg_proto_min];
	32	range.max_proto.all =
	33	(__be16 )&regs->data[priv->sreg_proto_max];
	34	}
0e5a1c7e PNA	35	regs->verdict.code = nf_nat_masquerade_ipv6(pkt->skb, &range,
0e5a1c7e PNA	36	nft_out(pkt));
9ba1f726 AB	37	}
9ba1f726 AB	38
20afd423 FW	39	static void
	40	nft_masq_ipv6_destroy(const struct nft_ctx ctx, const struct nft_expr expr)
	41	{
	42	nf_ct_netns_put(ctx->net, NFPROTO_IPV6);
	43	}
	44
9ba1f726 AB	45	static struct nft_expr_type nft_masq_ipv6_type;
	46	static const struct nft_expr_ops nft_masq_ipv6_ops = {
	47	.type = &nft_masq_ipv6_type,
	48	.size = NFT_EXPR_SIZE(sizeof(struct nft_masq)),
	49	.eval = nft_masq_ipv6_eval,
8da4cc1b	50	.init = nft_masq_init,
20afd423	51	.destroy = nft_masq_ipv6_destroy,
9ba1f726	52	.dump = nft_masq_dump,
7210e4e3	53	.validate = nft_masq_validate,
9ba1f726 AB	54	};
	55
	56	static struct nft_expr_type nft_masq_ipv6_type __read_mostly = {
	57	.family = NFPROTO_IPV6,
	58	.name = "masq",
	59	.ops = &nft_masq_ipv6_ops,
	60	.policy = nft_masq_policy,
	61	.maxattr = NFTA_MASQ_MAX,
	62	.owner = THIS_MODULE,
	63	};
	64
	65	static int __init nft_masq_ipv6_module_init(void)
	66	{
8da4cc1b AB	67	int ret;
	68
	69	ret = nft_register_expr(&nft_masq_ipv6_type);
	70	if (ret < 0)
	71	return ret;
	72
	73	nf_nat_masquerade_ipv6_register_notifier();
	74
	75	return ret;
9ba1f726 AB	76	}
	77
	78	static void __exit nft_masq_ipv6_module_exit(void)
	79	{
	80	nft_unregister_expr(&nft_masq_ipv6_type);
8da4cc1b	81	nf_nat_masquerade_ipv6_unregister_notifier();
9ba1f726 AB	82	}
	83
	84	module_init(nft_masq_ipv6_module_init);
	85	module_exit(nft_masq_ipv6_module_exit);
	86
	87	MODULE_LICENSE("GPL");
cd727514	88	MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org>");
9ba1f726	89	MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "masq");