[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / netfilter / nft_dup_ipv6.c

/*
 * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.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/ipv6/nf_dup_ipv6.h>

struct nft_dup_ipv6 {
	enum nft_registers	sreg_addr:8;
	enum nft_registers	sreg_dev:8;
};

static void nft_dup_ipv6_eval(const struct nft_expr *expr,
			      struct nft_regs *regs,
			      const struct nft_pktinfo *pkt)
{
	struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
	struct in6_addr *gw = (struct in6_addr *)&regs->data[priv->sreg_addr];
	int oif = priv->sreg_dev ? regs->data[priv->sreg_dev] : -1;

	nf_dup_ipv6(pkt->net, pkt->skb, pkt->hook, gw, oif);
}

static int nft_dup_ipv6_init(const struct nft_ctx *ctx,
			     const struct nft_expr *expr,
			     const struct nlattr * const tb[])
{
	struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
	int err;

	if (tb[NFTA_DUP_SREG_ADDR] == NULL)
		return -EINVAL;

	priv->sreg_addr = nft_parse_register(tb[NFTA_DUP_SREG_ADDR]);
	err = nft_validate_register_load(priv->sreg_addr, sizeof(struct in6_addr));
	if (err < 0)
		return err;

	if (tb[NFTA_DUP_SREG_DEV] != NULL) {
		priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]);
		return nft_validate_register_load(priv->sreg_dev, sizeof(int));
	}
	return 0;
}

static int nft_dup_ipv6_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
	struct nft_dup_ipv6 *priv = nft_expr_priv(expr);

	if (nft_dump_register(skb, NFTA_DUP_SREG_ADDR, priv->sreg_addr))
		goto nla_put_failure;
	if (priv->sreg_dev &&
	    nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev))
		goto nla_put_failure;

	return 0;

nla_put_failure:
	return -1;
}

static struct nft_expr_type nft_dup_ipv6_type;
static const struct nft_expr_ops nft_dup_ipv6_ops = {
	.type		= &nft_dup_ipv6_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_dup_ipv6)),
	.eval		= nft_dup_ipv6_eval,
	.init		= nft_dup_ipv6_init,
	.dump		= nft_dup_ipv6_dump,
};

static const struct nla_policy nft_dup_ipv6_policy[NFTA_DUP_MAX + 1] = {
	[NFTA_DUP_SREG_ADDR]	= { .type = NLA_U32 },
	[NFTA_DUP_SREG_DEV]	= { .type = NLA_U32 },
};

static struct nft_expr_type nft_dup_ipv6_type __read_mostly = {
	.family		= NFPROTO_IPV6,
	.name		= "dup",
	.ops		= &nft_dup_ipv6_ops,
	.policy		= nft_dup_ipv6_policy,
	.maxattr	= NFTA_DUP_MAX,
	.owner		= THIS_MODULE,
};

static int __init nft_dup_ipv6_module_init(void)
{
	return nft_register_expr(&nft_dup_ipv6_type);
}

static void __exit nft_dup_ipv6_module_exit(void)
{
	nft_unregister_expr(&nft_dup_ipv6_type);
}

module_init(nft_dup_ipv6_module_init);
module_exit(nft_dup_ipv6_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "dup");
Commit	Line	Data
d877f071 PNA	1	/*
	2	* Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms of the GNU General Public License version 2 as published by
	6	* 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/ipv6/nf_dup_ipv6.h>
	17
	18	struct nft_dup_ipv6 {
	19	enum nft_registers sreg_addr:8;
	20	enum nft_registers sreg_dev:8;
	21	};
	22
	23	static void nft_dup_ipv6_eval(const struct nft_expr *expr,
	24	struct nft_regs *regs,
	25	const struct nft_pktinfo *pkt)
	26	{
	27	struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
	28	struct in6_addr gw = (struct in6_addr )&regs->data[priv->sreg_addr];
b73b8a1b	29	int oif = priv->sreg_dev ? regs->data[priv->sreg_dev] : -1;
d877f071	30
206e8c00	31	nf_dup_ipv6(pkt->net, pkt->skb, pkt->hook, gw, oif);
d877f071 PNA	32	}
	33
	34	static int nft_dup_ipv6_init(const struct nft_ctx *ctx,
	35	const struct nft_expr *expr,
	36	const struct nlattr * const tb[])
	37	{
	38	struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
	39	int err;
	40
	41	if (tb[NFTA_DUP_SREG_ADDR] == NULL)
	42	return -EINVAL;
	43
	44	priv->sreg_addr = nft_parse_register(tb[NFTA_DUP_SREG_ADDR]);
	45	err = nft_validate_register_load(priv->sreg_addr, sizeof(struct in6_addr));
	46	if (err < 0)
	47	return err;
	48
	49	if (tb[NFTA_DUP_SREG_DEV] != NULL) {
	50	priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]);
	51	return nft_validate_register_load(priv->sreg_dev, sizeof(int));
	52	}
	53	return 0;
	54	}
	55
	56	static int nft_dup_ipv6_dump(struct sk_buff skb, const struct nft_expr expr)
	57	{
	58	struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
	59
b73b8a1b LZ	60	if (nft_dump_register(skb, NFTA_DUP_SREG_ADDR, priv->sreg_addr))
	61	goto nla_put_failure;
	62	if (priv->sreg_dev &&
d877f071 PNA	63	nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev))
	64	goto nla_put_failure;
	65
	66	return 0;
	67
	68	nla_put_failure:
	69	return -1;
	70	}
	71
	72	static struct nft_expr_type nft_dup_ipv6_type;
	73	static const struct nft_expr_ops nft_dup_ipv6_ops = {
	74	.type = &nft_dup_ipv6_type,
	75	.size = NFT_EXPR_SIZE(sizeof(struct nft_dup_ipv6)),
	76	.eval = nft_dup_ipv6_eval,
	77	.init = nft_dup_ipv6_init,
	78	.dump = nft_dup_ipv6_dump,
	79	};
	80
	81	static const struct nla_policy nft_dup_ipv6_policy[NFTA_DUP_MAX + 1] = {
	82	[NFTA_DUP_SREG_ADDR] = { .type = NLA_U32 },
	83	[NFTA_DUP_SREG_DEV] = { .type = NLA_U32 },
	84	};
	85
	86	static struct nft_expr_type nft_dup_ipv6_type __read_mostly = {
	87	.family = NFPROTO_IPV6,
	88	.name = "dup",
	89	.ops = &nft_dup_ipv6_ops,
	90	.policy = nft_dup_ipv6_policy,
	91	.maxattr = NFTA_DUP_MAX,
	92	.owner = THIS_MODULE,
	93	};
	94
	95	static int __init nft_dup_ipv6_module_init(void)
	96	{
	97	return nft_register_expr(&nft_dup_ipv6_type);
	98	}
	99
	100	static void __exit nft_dup_ipv6_module_exit(void)
	101	{
	102	nft_unregister_expr(&nft_dup_ipv6_type);
	103	}
	104
	105	module_init(nft_dup_ipv6_module_init);
	106	module_exit(nft_dup_ipv6_module_exit);
	107
	108	MODULE_LICENSE("GPL");
	109	MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
	110	MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "dup");