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

/*
 * (C) 2007 Patrick McHardy <kaber@trash.net>
 *
 * 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/module.h>
#include <linux/skbuff.h>
#include <linux/gen_stats.h>

#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_rateest.h>
#include <net/netfilter/xt_rateest.h>


static bool
xt_rateest_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
	const struct xt_rateest_match_info *info = par->matchinfo;
	struct gnet_stats_rate_est64 sample = {0};
	u_int32_t bps1, bps2, pps1, pps2;
	bool ret = true;

	gen_estimator_read(&info->est1->rate_est, &sample);

	if (info->flags & XT_RATEEST_MATCH_DELTA) {
		bps1 = info->bps1 >= sample.bps ? info->bps1 - sample.bps : 0;
		pps1 = info->pps1 >= sample.pps ? info->pps1 - sample.pps : 0;
	} else {
		bps1 = sample.bps;
		pps1 = sample.pps;
	}

	if (info->flags & XT_RATEEST_MATCH_ABS) {
		bps2 = info->bps2;
		pps2 = info->pps2;
	} else {
		gen_estimator_read(&info->est2->rate_est, &sample);

		if (info->flags & XT_RATEEST_MATCH_DELTA) {
			bps2 = info->bps2 >= sample.bps ? info->bps2 - sample.bps : 0;
			pps2 = info->pps2 >= sample.pps ? info->pps2 - sample.pps : 0;
		} else {
			bps2 = sample.bps;
			pps2 = sample.pps;
		}
	}

	switch (info->mode) {
	case XT_RATEEST_MATCH_LT:
		if (info->flags & XT_RATEEST_MATCH_BPS)
			ret &= bps1 < bps2;
		if (info->flags & XT_RATEEST_MATCH_PPS)
			ret &= pps1 < pps2;
		break;
	case XT_RATEEST_MATCH_GT:
		if (info->flags & XT_RATEEST_MATCH_BPS)
			ret &= bps1 > bps2;
		if (info->flags & XT_RATEEST_MATCH_PPS)
			ret &= pps1 > pps2;
		break;
	case XT_RATEEST_MATCH_EQ:
		if (info->flags & XT_RATEEST_MATCH_BPS)
			ret &= bps1 == bps2;
		if (info->flags & XT_RATEEST_MATCH_PPS)
			ret &= pps1 == pps2;
		break;
	}

	ret ^= info->flags & XT_RATEEST_MATCH_INVERT ? true : false;
	return ret;
}

static int xt_rateest_mt_checkentry(const struct xt_mtchk_param *par)
{
	struct xt_rateest_match_info *info = par->matchinfo;
	struct xt_rateest *est1, *est2;
	int ret = -EINVAL;

	if (hweight32(info->flags & (XT_RATEEST_MATCH_ABS |
				     XT_RATEEST_MATCH_REL)) != 1)
		goto err1;

	if (!(info->flags & (XT_RATEEST_MATCH_BPS | XT_RATEEST_MATCH_PPS)))
		goto err1;

	switch (info->mode) {
	case XT_RATEEST_MATCH_EQ:
	case XT_RATEEST_MATCH_LT:
	case XT_RATEEST_MATCH_GT:
		break;
	default:
		goto err1;
	}

	ret  = -ENOENT;
	est1 = xt_rateest_lookup(info->name1);
	if (!est1)
		goto err1;

	est2 = NULL;
	if (info->flags & XT_RATEEST_MATCH_REL) {
		est2 = xt_rateest_lookup(info->name2);
		if (!est2)
			goto err2;
	}

	info->est1 = est1;
	info->est2 = est2;
	return 0;

err2:
	xt_rateest_put(est1);
err1:
	return ret;
}

static void xt_rateest_mt_destroy(const struct xt_mtdtor_param *par)
{
	struct xt_rateest_match_info *info = par->matchinfo;

	xt_rateest_put(info->est1);
	if (info->est2)
		xt_rateest_put(info->est2);
}

static struct xt_match xt_rateest_mt_reg __read_mostly = {
	.name       = "rateest",
	.revision   = 0,
	.family     = NFPROTO_UNSPEC,
	.match      = xt_rateest_mt,
	.checkentry = xt_rateest_mt_checkentry,
	.destroy    = xt_rateest_mt_destroy,
	.matchsize  = sizeof(struct xt_rateest_match_info),
	.usersize   = offsetof(struct xt_rateest_match_info, est1),
	.me         = THIS_MODULE,
};

static int __init xt_rateest_mt_init(void)
{
	return xt_register_match(&xt_rateest_mt_reg);
}

static void __exit xt_rateest_mt_fini(void)
{
	xt_unregister_match(&xt_rateest_mt_reg);
}

MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("xtables rate estimator match");
MODULE_ALIAS("ipt_rateest");
MODULE_ALIAS("ip6t_rateest");
module_init(xt_rateest_mt_init);
module_exit(xt_rateest_mt_fini);
Commit	Line	Data
50c164a8 PM	1	/*
	2	* (C) 2007 Patrick McHardy <kaber@trash.net>
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*/
	8	#include <linux/module.h>
	9	#include <linux/skbuff.h>
	10	#include <linux/gen_stats.h>
	11
	12	#include <linux/netfilter/x_tables.h>
	13	#include <linux/netfilter/xt_rateest.h>
	14	#include <net/netfilter/xt_rateest.h>
	15
	16
f7108a20	17	static bool
62fc8051	18	xt_rateest_mt(const struct sk_buff skb, struct xt_action_param par)
50c164a8	19	{
f7108a20	20	const struct xt_rateest_match_info *info = par->matchinfo;
1c0d32fd	21	struct gnet_stats_rate_est64 sample = {0};
50c164a8 PM	22	u_int32_t bps1, bps2, pps1, pps2;
	23	bool ret = true;
	24
1c0d32fd ED	25	gen_estimator_read(&info->est1->rate_est, &sample);
1c0d32fd ED	26
50c164a8	27	if (info->flags & XT_RATEEST_MATCH_DELTA) {
1c0d32fd ED	28	bps1 = info->bps1 >= sample.bps ? info->bps1 - sample.bps : 0;
1c0d32fd ED	29	pps1 = info->pps1 >= sample.pps ? info->pps1 - sample.pps : 0;
50c164a8	30	} else {
1c0d32fd ED	31	bps1 = sample.bps;
1c0d32fd ED	32	pps1 = sample.pps;
50c164a8	33	}
50c164a8 PM	34
	35	if (info->flags & XT_RATEEST_MATCH_ABS) {
	36	bps2 = info->bps2;
	37	pps2 = info->pps2;
	38	} else {
1c0d32fd ED	39	gen_estimator_read(&info->est2->rate_est, &sample);
1c0d32fd ED	40
50c164a8	41	if (info->flags & XT_RATEEST_MATCH_DELTA) {
1c0d32fd ED	42	bps2 = info->bps2 >= sample.bps ? info->bps2 - sample.bps : 0;
1c0d32fd ED	43	pps2 = info->pps2 >= sample.pps ? info->pps2 - sample.pps : 0;
50c164a8	44	} else {
1c0d32fd ED	45	bps2 = sample.bps;
1c0d32fd ED	46	pps2 = sample.pps;
50c164a8	47	}
50c164a8 PM	48	}
	49
	50	switch (info->mode) {
	51	case XT_RATEEST_MATCH_LT:
	52	if (info->flags & XT_RATEEST_MATCH_BPS)
	53	ret &= bps1 < bps2;
	54	if (info->flags & XT_RATEEST_MATCH_PPS)
	55	ret &= pps1 < pps2;
	56	break;
	57	case XT_RATEEST_MATCH_GT:
	58	if (info->flags & XT_RATEEST_MATCH_BPS)
	59	ret &= bps1 > bps2;
	60	if (info->flags & XT_RATEEST_MATCH_PPS)
	61	ret &= pps1 > pps2;
	62	break;
	63	case XT_RATEEST_MATCH_EQ:
	64	if (info->flags & XT_RATEEST_MATCH_BPS)
	65	ret &= bps1 == bps2;
	66	if (info->flags & XT_RATEEST_MATCH_PPS)
4d900f9d	67	ret &= pps1 == pps2;
50c164a8 PM	68	break;
	69	}
	70
	71	ret ^= info->flags & XT_RATEEST_MATCH_INVERT ? true : false;
	72	return ret;
	73	}
	74
b0f38452	75	static int xt_rateest_mt_checkentry(const struct xt_mtchk_param *par)
50c164a8	76	{
9b4fce7a	77	struct xt_rateest_match_info *info = par->matchinfo;
50c164a8	78	struct xt_rateest est1, est2;
00fe1ae9	79	int ret = -EINVAL;
50c164a8 PM	80
	81	if (hweight32(info->flags & (XT_RATEEST_MATCH_ABS \|
	82	XT_RATEEST_MATCH_REL)) != 1)
	83	goto err1;
	84
	85	if (!(info->flags & (XT_RATEEST_MATCH_BPS \| XT_RATEEST_MATCH_PPS)))
	86	goto err1;
	87
	88	switch (info->mode) {
	89	case XT_RATEEST_MATCH_EQ:
	90	case XT_RATEEST_MATCH_LT:
	91	case XT_RATEEST_MATCH_GT:
	92	break;
	93	default:
	94	goto err1;
	95	}
	96
4a5a5c73	97	ret = -ENOENT;
50c164a8 PM	98	est1 = xt_rateest_lookup(info->name1);
	99	if (!est1)
	100	goto err1;
	101
00fe1ae9	102	est2 = NULL;
50c164a8 PM	103	if (info->flags & XT_RATEEST_MATCH_REL) {
	104	est2 = xt_rateest_lookup(info->name2);
	105	if (!est2)
	106	goto err2;
00fe1ae9	107	}
50c164a8 PM	108
	109	info->est1 = est1;
	110	info->est2 = est2;
bd414ee6	111	return 0;
50c164a8 PM	112
	113	err2:
	114	xt_rateest_put(est1);
	115	err1:
00fe1ae9	116	return ret;
50c164a8 PM	117	}
50c164a8 PM	118
6be3d859	119	static void xt_rateest_mt_destroy(const struct xt_mtdtor_param *par)
50c164a8	120	{
6be3d859	121	struct xt_rateest_match_info *info = par->matchinfo;
50c164a8 PM	122
	123	xt_rateest_put(info->est1);
	124	if (info->est2)
	125	xt_rateest_put(info->est2);
	126	}
	127
55b69e91 JE	128	static struct xt_match xt_rateest_mt_reg __read_mostly = {
	129	.name = "rateest",
	130	.revision = 0,
	131	.family = NFPROTO_UNSPEC,
	132	.match = xt_rateest_mt,
	133	.checkentry = xt_rateest_mt_checkentry,
	134	.destroy = xt_rateest_mt_destroy,
	135	.matchsize = sizeof(struct xt_rateest_match_info),
ec231890	136	.usersize = offsetof(struct xt_rateest_match_info, est1),
55b69e91	137	.me = THIS_MODULE,
50c164a8 PM	138	};
	139
	140	static int __init xt_rateest_mt_init(void)
	141	{
55b69e91	142	return xt_register_match(&xt_rateest_mt_reg);
50c164a8 PM	143	}
	144
	145	static void __exit xt_rateest_mt_fini(void)
	146	{
55b69e91	147	xt_unregister_match(&xt_rateest_mt_reg);
50c164a8 PM	148	}
	149
	150	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
	151	MODULE_LICENSE("GPL");
	152	MODULE_DESCRIPTION("xtables rate estimator match");
	153	MODULE_ALIAS("ipt_rateest");
	154	MODULE_ALIAS("ip6t_rateest");
	155	module_init(xt_rateest_mt_init);
	156	module_exit(xt_rateest_mt_fini);