[mirror_ubuntu-hirsute-kernel.git] / net / netfilter / nft_reject.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
 * Copyright (c) 2013 Eric Leblond <eric@regit.org>
 *
 * 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);

	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)
{
	if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
		return ICMP_NET_UNREACH;

	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)
{
	if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
		return ICMPV6_NOROUTE;

	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
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
96518518	2	/*
ef1f7df9	3	* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
bee11dc7	4	* Copyright (c) 2013 Eric Leblond <eric@regit.org>
96518518	5	*
96518518 PM	6	* Development of this code funded by Astaro AG (http://www.astaro.com/)
	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>
cc4723ca	16	#include <net/netfilter/nft_reject.h>
51b0a5d8 PNA	17	#include <linux/icmp.h>
51b0a5d8 PNA	18	#include <linux/icmpv6.h>
bee11dc7	19
cc4723ca	20	const struct nla_policy nft_reject_policy[NFTA_REJECT_MAX + 1] = {
96518518 PM	21	[NFTA_REJECT_TYPE] = { .type = NLA_U32 },
	22	[NFTA_REJECT_ICMP_CODE] = { .type = NLA_U8 },
	23	};
cc4723ca	24	EXPORT_SYMBOL_GPL(nft_reject_policy);
96518518	25
89e1f6d2 LZ	26	int nft_reject_validate(const struct nft_ctx *ctx,
	27	const struct nft_expr *expr,
	28	const struct nft_data **data)
	29	{
	30	return nft_chain_validate_hooks(ctx->chain,
	31	(1 << NF_INET_LOCAL_IN) \|
	32	(1 << NF_INET_FORWARD) \|
	33	(1 << NF_INET_LOCAL_OUT));
	34	}
	35	EXPORT_SYMBOL_GPL(nft_reject_validate);
	36
cc4723ca PM	37	int nft_reject_init(const struct nft_ctx *ctx,
	38	const struct nft_expr *expr,
	39	const struct nlattr * const tb[])
96518518 PM	40	{
	41	struct nft_reject *priv = nft_expr_priv(expr);
	42
	43	if (tb[NFTA_REJECT_TYPE] == NULL)
	44	return -EINVAL;
	45
	46	priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
	47	switch (priv->type) {
	48	case NFT_REJECT_ICMP_UNREACH:
	49	if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
	50	return -EINVAL;
	51	priv->icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
	52	case NFT_REJECT_TCP_RST:
	53	break;
	54	default:
	55	return -EINVAL;
	56	}
	57
	58	return 0;
	59	}
cc4723ca	60	EXPORT_SYMBOL_GPL(nft_reject_init);
96518518	61
cc4723ca	62	int nft_reject_dump(struct sk_buff skb, const struct nft_expr expr)
96518518 PM	63	{
	64	const struct nft_reject *priv = nft_expr_priv(expr);
	65
bee11dc7	66	if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
96518518 PM	67	goto nla_put_failure;
	68
	69	switch (priv->type) {
	70	case NFT_REJECT_ICMP_UNREACH:
	71	if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
	72	goto nla_put_failure;
	73	break;
129d23a5 DM	74	default:
129d23a5 DM	75	break;
96518518 PM	76	}
	77
	78	return 0;
	79
	80	nla_put_failure:
	81	return -1;
	82	}
cc4723ca	83	EXPORT_SYMBOL_GPL(nft_reject_dump);
96518518	84
f0d1f04f	85	static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = {
51b0a5d8 PNA	86	[NFT_REJECT_ICMPX_NO_ROUTE] = ICMP_NET_UNREACH,
	87	[NFT_REJECT_ICMPX_PORT_UNREACH] = ICMP_PORT_UNREACH,
	88	[NFT_REJECT_ICMPX_HOST_UNREACH] = ICMP_HOST_UNREACH,
	89	[NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMP_PKT_FILTERED,
	90	};
	91
	92	int nft_reject_icmp_code(u8 code)
	93	{
fa5950e4 FW	94	if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
fa5950e4 FW	95	return ICMP_NET_UNREACH;
51b0a5d8 PNA	96
	97	return icmp_code_v4[code];
	98	}
	99
	100	EXPORT_SYMBOL_GPL(nft_reject_icmp_code);
	101
	102
f0d1f04f	103	static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = {
51b0a5d8 PNA	104	[NFT_REJECT_ICMPX_NO_ROUTE] = ICMPV6_NOROUTE,
	105	[NFT_REJECT_ICMPX_PORT_UNREACH] = ICMPV6_PORT_UNREACH,
	106	[NFT_REJECT_ICMPX_HOST_UNREACH] = ICMPV6_ADDR_UNREACH,
	107	[NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMPV6_ADM_PROHIBITED,
	108	};
	109
	110	int nft_reject_icmpv6_code(u8 code)
	111	{
fa5950e4 FW	112	if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
fa5950e4 FW	113	return ICMPV6_NOROUTE;
51b0a5d8 PNA	114
	115	return icmp_code_v6[code];
	116	}
	117
	118	EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code);
	119
96518518 PM	120	MODULE_LICENSE("GPL");
96518518 PM	121	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");