[deliverable/linux.git] / net / netfilter / nft_reject.c

/*
 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
 * Copyright (c) 2013 Eric Leblond <eric@regit.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.
 *
 * Development of this code funded by Astaro AG (http://www.astaro.com/)
 */

#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/nft_reject.h>
#include <linux/icmp.h>
#include <linux/icmpv6.h>

const struct nla_policy nft_reject_policy[NFTA_REJECT_MAX + 1] = {
	[NFTA_REJECT_TYPE]		= { .type = NLA_U32 },
	[NFTA_REJECT_ICMP_CODE]		= { .type = NLA_U8 },
};
EXPORT_SYMBOL_GPL(nft_reject_policy);

int nft_reject_validate(const struct nft_ctx *ctx,
			const struct nft_expr *expr,
			const struct nft_data **data)
{
	return nft_chain_validate_hooks(ctx->chain,
					(1 << NF_INET_LOCAL_IN) |
					(1 << NF_INET_FORWARD) |
					(1 << NF_INET_LOCAL_OUT));
}
EXPORT_SYMBOL_GPL(nft_reject_validate);

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

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

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

	priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
	switch (priv->type) {
	case NFT_REJECT_ICMP_UNREACH:
		if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
			return -EINVAL;
		priv->icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
	case NFT_REJECT_TCP_RST:
		break;
	default:
		return -EINVAL;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(nft_reject_init);

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

	if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
		goto nla_put_failure;

	switch (priv->type) {
	case NFT_REJECT_ICMP_UNREACH:
		if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
			goto nla_put_failure;
		break;
	default:
		break;
	}

	return 0;

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

static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = {
	[NFT_REJECT_ICMPX_NO_ROUTE]		= ICMP_NET_UNREACH,
	[NFT_REJECT_ICMPX_PORT_UNREACH]		= ICMP_PORT_UNREACH,
	[NFT_REJECT_ICMPX_HOST_UNREACH]		= ICMP_HOST_UNREACH,
	[NFT_REJECT_ICMPX_ADMIN_PROHIBITED]	= ICMP_PKT_FILTERED,
};

int nft_reject_icmp_code(u8 code)
{
	BUG_ON(code > NFT_REJECT_ICMPX_MAX);

	return icmp_code_v4[code];
}

EXPORT_SYMBOL_GPL(nft_reject_icmp_code);


static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = {
	[NFT_REJECT_ICMPX_NO_ROUTE]		= ICMPV6_NOROUTE,
	[NFT_REJECT_ICMPX_PORT_UNREACH]		= ICMPV6_PORT_UNREACH,
	[NFT_REJECT_ICMPX_HOST_UNREACH]		= ICMPV6_ADDR_UNREACH,
	[NFT_REJECT_ICMPX_ADMIN_PROHIBITED]	= ICMPV6_ADM_PROHIBITED,
};

int nft_reject_icmpv6_code(u8 code)
{
	BUG_ON(code > NFT_REJECT_ICMPX_MAX);

	return icmp_code_v6[code];
}

EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
Commit	Line	Data
96518518	1	/*
ef1f7df9	2	* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
bee11dc7	3	* Copyright (c) 2013 Eric Leblond <eric@regit.org>
96518518 PM	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*
	9	* Development of this code funded by Astaro AG (http://www.astaro.com/)
	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/init.h>
	14	#include <linux/module.h>
	15	#include <linux/netlink.h>
	16	#include <linux/netfilter.h>
	17	#include <linux/netfilter/nf_tables.h>
	18	#include <net/netfilter/nf_tables.h>
cc4723ca	19	#include <net/netfilter/nft_reject.h>
51b0a5d8 PNA	20	#include <linux/icmp.h>
51b0a5d8 PNA	21	#include <linux/icmpv6.h>
bee11dc7	22
cc4723ca	23	const struct nla_policy nft_reject_policy[NFTA_REJECT_MAX + 1] = {
96518518 PM	24	[NFTA_REJECT_TYPE] = { .type = NLA_U32 },
	25	[NFTA_REJECT_ICMP_CODE] = { .type = NLA_U8 },
	26	};
cc4723ca	27	EXPORT_SYMBOL_GPL(nft_reject_policy);
96518518	28
89e1f6d2 LZ	29	int nft_reject_validate(const struct nft_ctx *ctx,
	30	const struct nft_expr *expr,
	31	const struct nft_data **data)
	32	{
	33	return nft_chain_validate_hooks(ctx->chain,
	34	(1 << NF_INET_LOCAL_IN) \|
	35	(1 << NF_INET_FORWARD) \|
	36	(1 << NF_INET_LOCAL_OUT));
	37	}
	38	EXPORT_SYMBOL_GPL(nft_reject_validate);
	39
cc4723ca PM	40	int nft_reject_init(const struct nft_ctx *ctx,
	41	const struct nft_expr *expr,
	42	const struct nlattr * const tb[])
96518518 PM	43	{
96518518 PM	44	struct nft_reject *priv = nft_expr_priv(expr);
89e1f6d2 LZ	45	int err;
	46
	47	err = nft_reject_validate(ctx, expr, NULL);
	48	if (err < 0)
	49	return err;
96518518 PM	50
	51	if (tb[NFTA_REJECT_TYPE] == NULL)
	52	return -EINVAL;
	53
	54	priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
	55	switch (priv->type) {
	56	case NFT_REJECT_ICMP_UNREACH:
	57	if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
	58	return -EINVAL;
	59	priv->icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
	60	case NFT_REJECT_TCP_RST:
	61	break;
	62	default:
	63	return -EINVAL;
	64	}
	65
	66	return 0;
	67	}
cc4723ca	68	EXPORT_SYMBOL_GPL(nft_reject_init);
96518518	69
cc4723ca	70	int nft_reject_dump(struct sk_buff skb, const struct nft_expr expr)
96518518 PM	71	{
	72	const struct nft_reject *priv = nft_expr_priv(expr);
	73
bee11dc7	74	if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
96518518 PM	75	goto nla_put_failure;
	76
	77	switch (priv->type) {
	78	case NFT_REJECT_ICMP_UNREACH:
	79	if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
	80	goto nla_put_failure;
	81	break;
129d23a5 DM	82	default:
129d23a5 DM	83	break;
96518518 PM	84	}
	85
	86	return 0;
	87
	88	nla_put_failure:
	89	return -1;
	90	}
cc4723ca	91	EXPORT_SYMBOL_GPL(nft_reject_dump);
96518518	92
f0d1f04f	93	static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = {
51b0a5d8 PNA	94	[NFT_REJECT_ICMPX_NO_ROUTE] = ICMP_NET_UNREACH,
	95	[NFT_REJECT_ICMPX_PORT_UNREACH] = ICMP_PORT_UNREACH,
	96	[NFT_REJECT_ICMPX_HOST_UNREACH] = ICMP_HOST_UNREACH,
	97	[NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMP_PKT_FILTERED,
	98	};
	99
	100	int nft_reject_icmp_code(u8 code)
	101	{
f0d1f04f	102	BUG_ON(code > NFT_REJECT_ICMPX_MAX);
51b0a5d8 PNA	103
	104	return icmp_code_v4[code];
	105	}
	106
	107	EXPORT_SYMBOL_GPL(nft_reject_icmp_code);
	108
	109
f0d1f04f	110	static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = {
51b0a5d8 PNA	111	[NFT_REJECT_ICMPX_NO_ROUTE] = ICMPV6_NOROUTE,
	112	[NFT_REJECT_ICMPX_PORT_UNREACH] = ICMPV6_PORT_UNREACH,
	113	[NFT_REJECT_ICMPX_HOST_UNREACH] = ICMPV6_ADDR_UNREACH,
	114	[NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMPV6_ADM_PROHIBITED,
	115	};
	116
	117	int nft_reject_icmpv6_code(u8 code)
	118	{
f0d1f04f	119	BUG_ON(code > NFT_REJECT_ICMPX_MAX);
51b0a5d8 PNA	120
	121	return icmp_code_v6[code];
	122	}
	123
	124	EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code);
	125
96518518 PM	126	MODULE_LICENSE("GPL");
96518518 PM	127	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");