[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) |
					(1 << NF_INET_PRE_ROUTING));
}
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 icmp_code;

	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:
	case NFT_REJECT_ICMPX_UNREACH:
		if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
			return -EINVAL;

		icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
		if (priv->type == NFT_REJECT_ICMPX_UNREACH &&
		    icmp_code > NFT_REJECT_ICMPX_MAX)
			return -EINVAL;

		priv->icmp_code = icmp_code;
		break;
	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:
	case NFT_REJECT_ICMPX_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>");
MODULE_DESCRIPTION("Netfilter x_tables over nftables module");
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) \|
f53b9b0b LGL	33	(1 << NF_INET_LOCAL_OUT) \|
f53b9b0b LGL	34	(1 << NF_INET_PRE_ROUTING));
89e1f6d2 LZ	35	}
	36	EXPORT_SYMBOL_GPL(nft_reject_validate);
	37
cc4723ca PM	38	int nft_reject_init(const struct nft_ctx *ctx,
	39	const struct nft_expr *expr,
	40	const struct nlattr * const tb[])
96518518 PM	41	{
96518518 PM	42	struct nft_reject *priv = nft_expr_priv(expr);
312ca575	43	int icmp_code;
96518518 PM	44
	45	if (tb[NFTA_REJECT_TYPE] == NULL)
	46	return -EINVAL;
	47
	48	priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
	49	switch (priv->type) {
	50	case NFT_REJECT_ICMP_UNREACH:
312ca575	51	case NFT_REJECT_ICMPX_UNREACH:
96518518 PM	52	if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
96518518 PM	53	return -EINVAL;
312ca575 JGG	54
	55	icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
	56	if (priv->type == NFT_REJECT_ICMPX_UNREACH &&
	57	icmp_code > NFT_REJECT_ICMPX_MAX)
	58	return -EINVAL;
	59
	60	priv->icmp_code = icmp_code;
	61	break;
96518518 PM	62	case NFT_REJECT_TCP_RST:
	63	break;
	64	default:
	65	return -EINVAL;
	66	}
	67
	68	return 0;
	69	}
cc4723ca	70	EXPORT_SYMBOL_GPL(nft_reject_init);
96518518	71
cc4723ca	72	int nft_reject_dump(struct sk_buff skb, const struct nft_expr expr)
96518518 PM	73	{
	74	const struct nft_reject *priv = nft_expr_priv(expr);
	75
bee11dc7	76	if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
96518518 PM	77	goto nla_put_failure;
	78
	79	switch (priv->type) {
	80	case NFT_REJECT_ICMP_UNREACH:
312ca575	81	case NFT_REJECT_ICMPX_UNREACH:
96518518 PM	82	if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
	83	goto nla_put_failure;
	84	break;
129d23a5 DM	85	default:
129d23a5 DM	86	break;
96518518 PM	87	}
	88
	89	return 0;
	90
	91	nla_put_failure:
	92	return -1;
	93	}
cc4723ca	94	EXPORT_SYMBOL_GPL(nft_reject_dump);
96518518	95
f0d1f04f	96	static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = {
51b0a5d8 PNA	97	[NFT_REJECT_ICMPX_NO_ROUTE] = ICMP_NET_UNREACH,
	98	[NFT_REJECT_ICMPX_PORT_UNREACH] = ICMP_PORT_UNREACH,
	99	[NFT_REJECT_ICMPX_HOST_UNREACH] = ICMP_HOST_UNREACH,
	100	[NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMP_PKT_FILTERED,
	101	};
	102
	103	int nft_reject_icmp_code(u8 code)
	104	{
fa5950e4 FW	105	if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
fa5950e4 FW	106	return ICMP_NET_UNREACH;
51b0a5d8 PNA	107
	108	return icmp_code_v4[code];
	109	}
	110
	111	EXPORT_SYMBOL_GPL(nft_reject_icmp_code);
	112
	113
f0d1f04f	114	static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = {
51b0a5d8 PNA	115	[NFT_REJECT_ICMPX_NO_ROUTE] = ICMPV6_NOROUTE,
	116	[NFT_REJECT_ICMPX_PORT_UNREACH] = ICMPV6_PORT_UNREACH,
	117	[NFT_REJECT_ICMPX_HOST_UNREACH] = ICMPV6_ADDR_UNREACH,
	118	[NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMPV6_ADM_PROHIBITED,
	119	};
	120
	121	int nft_reject_icmpv6_code(u8 code)
	122	{
fa5950e4 FW	123	if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
fa5950e4 FW	124	return ICMPV6_NOROUTE;
51b0a5d8 PNA	125
	126	return icmp_code_v6[code];
	127	}
	128
	129	EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code);
	130
96518518 PM	131	MODULE_LICENSE("GPL");
96518518 PM	132	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4cacc395	133	MODULE_DESCRIPTION("Netfilter x_tables over nftables module");