[linux-block.git] / net / netfilter / xt_dscp.c

// SPDX-License-Identifier: GPL-2.0-only
/* IP tables module for matching the value of the IPv4/IPv6 DSCP field
 *
 * (C) 2002 by Harald Welte <laforge@netfilter.org>
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <net/dsfield.h>

#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_dscp.h>

MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
MODULE_DESCRIPTION("Xtables: DSCP/TOS field match");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_dscp");
MODULE_ALIAS("ip6t_dscp");
MODULE_ALIAS("ipt_tos");
MODULE_ALIAS("ip6t_tos");

static bool
dscp_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
	const struct xt_dscp_info *info = par->matchinfo;
	u_int8_t dscp = ipv4_get_dsfield(ip_hdr(skb)) >> XT_DSCP_SHIFT;

	return (dscp == info->dscp) ^ !!info->invert;
}

static bool
dscp_mt6(const struct sk_buff *skb, struct xt_action_param *par)
{
	const struct xt_dscp_info *info = par->matchinfo;
	u_int8_t dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> XT_DSCP_SHIFT;

	return (dscp == info->dscp) ^ !!info->invert;
}

static int dscp_mt_check(const struct xt_mtchk_param *par)
{
	const struct xt_dscp_info *info = par->matchinfo;

	if (info->dscp > XT_DSCP_MAX)
		return -EDOM;

	return 0;
}

static bool tos_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
	const struct xt_tos_match_info *info = par->matchinfo;

	if (xt_family(par) == NFPROTO_IPV4)
		return ((ip_hdr(skb)->tos & info->tos_mask) ==
		       info->tos_value) ^ !!info->invert;
	else
		return ((ipv6_get_dsfield(ipv6_hdr(skb)) & info->tos_mask) ==
		       info->tos_value) ^ !!info->invert;
}

static struct xt_match dscp_mt_reg[] __read_mostly = {
	{
		.name		= "dscp",
		.family		= NFPROTO_IPV4,
		.checkentry	= dscp_mt_check,
		.match		= dscp_mt,
		.matchsize	= sizeof(struct xt_dscp_info),
		.me		= THIS_MODULE,
	},
	{
		.name		= "dscp",
		.family		= NFPROTO_IPV6,
		.checkentry	= dscp_mt_check,
		.match		= dscp_mt6,
		.matchsize	= sizeof(struct xt_dscp_info),
		.me		= THIS_MODULE,
	},
	{
		.name		= "tos",
		.revision	= 1,
		.family		= NFPROTO_IPV4,
		.match		= tos_mt,
		.matchsize	= sizeof(struct xt_tos_match_info),
		.me		= THIS_MODULE,
	},
	{
		.name		= "tos",
		.revision	= 1,
		.family		= NFPROTO_IPV6,
		.match		= tos_mt,
		.matchsize	= sizeof(struct xt_tos_match_info),
		.me		= THIS_MODULE,
	},
};

static int __init dscp_mt_init(void)
{
	return xt_register_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg));
}

static void __exit dscp_mt_exit(void)
{
	xt_unregister_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg));
}

module_init(dscp_mt_init);
module_exit(dscp_mt_exit);
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
9ba16276	2	/* IP tables module for matching the value of the IPv4/IPv6 DSCP field
9ba16276 YK	3	*
9ba16276 YK	4	* (C) 2002 by Harald Welte <laforge@netfilter.org>
9ba16276	5	*/
8bee4bad	6	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9ba16276 YK	7	#include <linux/module.h>
	8	#include <linux/skbuff.h>
	9	#include <linux/ip.h>
	10	#include <linux/ipv6.h>
	11	#include <net/dsfield.h>
	12
9ba16276	13	#include <linux/netfilter/x_tables.h>
c3b33e6a	14	#include <linux/netfilter/xt_dscp.h>
9ba16276 YK	15
9ba16276 YK	16	MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
2ae15b64	17	MODULE_DESCRIPTION("Xtables: DSCP/TOS field match");
9ba16276 YK	18	MODULE_LICENSE("GPL");
	19	MODULE_ALIAS("ipt_dscp");
	20	MODULE_ALIAS("ip6t_dscp");
c3b33e6a	21	MODULE_ALIAS("ipt_tos");
f1095ab5	22	MODULE_ALIAS("ip6t_tos");
9ba16276	23
d3c5ee6d	24	static bool
62fc8051	25	dscp_mt(const struct sk_buff skb, struct xt_action_param par)
1d93a9cb	26	{
f7108a20	27	const struct xt_dscp_info *info = par->matchinfo;
1d93a9cb JE	28	u_int8_t dscp = ipv4_get_dsfield(ip_hdr(skb)) >> XT_DSCP_SHIFT;
	29
	30	return (dscp == info->dscp) ^ !!info->invert;
	31	}
	32
d3c5ee6d	33	static bool
62fc8051	34	dscp_mt6(const struct sk_buff skb, struct xt_action_param par)
9ba16276	35	{
f7108a20	36	const struct xt_dscp_info *info = par->matchinfo;
0660e03f	37	u_int8_t dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> XT_DSCP_SHIFT;
9ba16276 YK	38
	39	return (dscp == info->dscp) ^ !!info->invert;
	40	}
	41
b0f38452	42	static int dscp_mt_check(const struct xt_mtchk_param *par)
9ba16276	43	{
9b4fce7a	44	const struct xt_dscp_info *info = par->matchinfo;
9ba16276	45
0cc9501f	46	if (info->dscp > XT_DSCP_MAX)
4a5a5c73	47	return -EDOM;
9ba16276	48
bd414ee6	49	return 0;
9ba16276 YK	50	}
9ba16276 YK	51
62fc8051	52	static bool tos_mt(const struct sk_buff skb, struct xt_action_param par)
f1095ab5	53	{
f7108a20	54	const struct xt_tos_match_info *info = par->matchinfo;
f1095ab5	55
613dbd95	56	if (xt_family(par) == NFPROTO_IPV4)
f1095ab5 JE	57	return ((ip_hdr(skb)->tos & info->tos_mask) ==
	58	info->tos_value) ^ !!info->invert;
	59	else
	60	return ((ipv6_get_dsfield(ipv6_hdr(skb)) & info->tos_mask) ==
	61	info->tos_value) ^ !!info->invert;
	62	}
	63
d3c5ee6d	64	static struct xt_match dscp_mt_reg[] __read_mostly = {
4470bbc7 PM	65	{
4470bbc7 PM	66	.name = "dscp",
ee999d8b	67	.family = NFPROTO_IPV4,
d3c5ee6d JE	68	.checkentry = dscp_mt_check,
d3c5ee6d JE	69	.match = dscp_mt,
4470bbc7 PM	70	.matchsize = sizeof(struct xt_dscp_info),
	71	.me = THIS_MODULE,
	72	},
	73	{
	74	.name = "dscp",
ee999d8b	75	.family = NFPROTO_IPV6,
d3c5ee6d JE	76	.checkentry = dscp_mt_check,
d3c5ee6d JE	77	.match = dscp_mt6,
4470bbc7 PM	78	.matchsize = sizeof(struct xt_dscp_info),
	79	.me = THIS_MODULE,
	80	},
f1095ab5 JE	81	{
	82	.name = "tos",
	83	.revision = 1,
ee999d8b	84	.family = NFPROTO_IPV4,
f1095ab5 JE	85	.match = tos_mt,
	86	.matchsize = sizeof(struct xt_tos_match_info),
	87	.me = THIS_MODULE,
	88	},
	89	{
	90	.name = "tos",
	91	.revision = 1,
ee999d8b	92	.family = NFPROTO_IPV6,
f1095ab5 JE	93	.match = tos_mt,
	94	.matchsize = sizeof(struct xt_tos_match_info),
	95	.me = THIS_MODULE,
	96	},
9ba16276 YK	97	};
9ba16276 YK	98
d3c5ee6d	99	static int __init dscp_mt_init(void)
9ba16276	100	{
d3c5ee6d	101	return xt_register_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg));
9ba16276 YK	102	}
9ba16276 YK	103
d3c5ee6d	104	static void __exit dscp_mt_exit(void)
9ba16276	105	{
d3c5ee6d	106	xt_unregister_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg));
9ba16276 YK	107	}
9ba16276 YK	108
d3c5ee6d JE	109	module_init(dscp_mt_init);
d3c5ee6d JE	110	module_exit(dscp_mt_exit);