[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, const struct xt_match_param *par)
{
	const struct xt_rateest_match_info *info = par->matchinfo;
	struct gnet_stats_rate_est *r;
	u_int32_t bps1, bps2, pps1, pps2;
	bool ret = true;

	spin_lock_bh(&info->est1->lock);
	r = &info->est1->rstats;
	if (info->flags & XT_RATEEST_MATCH_DELTA) {
		bps1 = info->bps1 >= r->bps ? info->bps1 - r->bps : 0;
		pps1 = info->pps1 >= r->pps ? info->pps1 - r->pps : 0;
	} else {
		bps1 = r->bps;
		pps1 = r->pps;
	}
	spin_unlock_bh(&info->est1->lock);

	if (info->flags & XT_RATEEST_MATCH_ABS) {
		bps2 = info->bps2;
		pps2 = info->pps2;
	} else {
		spin_lock_bh(&info->est2->lock);
		r = &info->est2->rstats;
		if (info->flags & XT_RATEEST_MATCH_DELTA) {
			bps2 = info->bps2 >= r->bps ? info->bps2 - r->bps : 0;
			pps2 = info->pps2 >= r->pps ? info->pps2 - r->pps : 0;
		} else {
			bps2 = r->bps;
			pps2 = r->pps;
		}
		spin_unlock_bh(&info->est2->lock);
	}

	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 &= pps2 == pps2;
		break;
	}

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

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

	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;
	}

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

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


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

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

static void xt_rateest_mt_destroy(const struct xt_match *match,
				  void *matchinfo)
{
	struct xt_rateest_match_info *info = 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),
	.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 JE	17	static bool
f7108a20 JE	18	xt_rateest_mt(const struct sk_buff skb, const struct xt_match_param par)
50c164a8	19	{
f7108a20	20	const struct xt_rateest_match_info *info = par->matchinfo;
50c164a8 PM	21	struct gnet_stats_rate_est *r;
	22	u_int32_t bps1, bps2, pps1, pps2;
	23	bool ret = true;
	24
	25	spin_lock_bh(&info->est1->lock);
	26	r = &info->est1->rstats;
	27	if (info->flags & XT_RATEEST_MATCH_DELTA) {
	28	bps1 = info->bps1 >= r->bps ? info->bps1 - r->bps : 0;
	29	pps1 = info->pps1 >= r->pps ? info->pps1 - r->pps : 0;
	30	} else {
	31	bps1 = r->bps;
	32	pps1 = r->pps;
	33	}
	34	spin_unlock_bh(&info->est1->lock);
	35
	36	if (info->flags & XT_RATEEST_MATCH_ABS) {
	37	bps2 = info->bps2;
	38	pps2 = info->pps2;
	39	} else {
	40	spin_lock_bh(&info->est2->lock);
	41	r = &info->est2->rstats;
	42	if (info->flags & XT_RATEEST_MATCH_DELTA) {
	43	bps2 = info->bps2 >= r->bps ? info->bps2 - r->bps : 0;
	44	pps2 = info->pps2 >= r->pps ? info->pps2 - r->pps : 0;
	45	} else {
	46	bps2 = r->bps;
	47	pps2 = r->pps;
	48	}
	49	spin_unlock_bh(&info->est2->lock);
	50	}
	51
	52	switch (info->mode) {
	53	case XT_RATEEST_MATCH_LT:
	54	if (info->flags & XT_RATEEST_MATCH_BPS)
	55	ret &= bps1 < bps2;
	56	if (info->flags & XT_RATEEST_MATCH_PPS)
	57	ret &= pps1 < pps2;
	58	break;
	59	case XT_RATEEST_MATCH_GT:
	60	if (info->flags & XT_RATEEST_MATCH_BPS)
	61	ret &= bps1 > bps2;
	62	if (info->flags & XT_RATEEST_MATCH_PPS)
	63	ret &= pps1 > pps2;
	64	break;
	65	case XT_RATEEST_MATCH_EQ:
	66	if (info->flags & XT_RATEEST_MATCH_BPS)
	67	ret &= bps1 == bps2;
	68	if (info->flags & XT_RATEEST_MATCH_PPS)
	69	ret &= pps2 == pps2;
	70	break;
	71	}
	72
	73	ret ^= info->flags & XT_RATEEST_MATCH_INVERT ? true : false;
	74	return ret;
	75	}
	76
9b4fce7a	77	static bool xt_rateest_mt_checkentry(const struct xt_mtchk_param *par)
50c164a8	78	{
9b4fce7a	79	struct xt_rateest_match_info *info = par->matchinfo;
50c164a8 PM	80	struct xt_rateest est1, est2;
	81
	82	if (hweight32(info->flags & (XT_RATEEST_MATCH_ABS \|
	83	XT_RATEEST_MATCH_REL)) != 1)
	84	goto err1;
	85
	86	if (!(info->flags & (XT_RATEEST_MATCH_BPS \| XT_RATEEST_MATCH_PPS)))
	87	goto err1;
	88
	89	switch (info->mode) {
	90	case XT_RATEEST_MATCH_EQ:
	91	case XT_RATEEST_MATCH_LT:
	92	case XT_RATEEST_MATCH_GT:
	93	break;
	94	default:
	95	goto err1;
	96	}
	97
	98	est1 = xt_rateest_lookup(info->name1);
	99	if (!est1)
	100	goto err1;
	101
	102	if (info->flags & XT_RATEEST_MATCH_REL) {
	103	est2 = xt_rateest_lookup(info->name2);
	104	if (!est2)
	105	goto err2;
	106	} else
	107	est2 = NULL;
	108
	109
	110	info->est1 = est1;
	111	info->est2 = est2;
	112	return true;
	113
	114	err2:
	115	xt_rateest_put(est1);
	116	err1:
	117	return false;
	118	}
	119
	120	static void xt_rateest_mt_destroy(const struct xt_match *match,
	121	void *matchinfo)
	122	{
3cf93c96	123	struct xt_rateest_match_info *info = matchinfo;
50c164a8 PM	124
	125	xt_rateest_put(info->est1);
	126	if (info->est2)
	127	xt_rateest_put(info->est2);
	128	}
	129
55b69e91 JE	130	static struct xt_match xt_rateest_mt_reg __read_mostly = {
	131	.name = "rateest",
	132	.revision = 0,
	133	.family = NFPROTO_UNSPEC,
	134	.match = xt_rateest_mt,
	135	.checkentry = xt_rateest_mt_checkentry,
	136	.destroy = xt_rateest_mt_destroy,
	137	.matchsize = sizeof(struct xt_rateest_match_info),
	138	.me = THIS_MODULE,
50c164a8 PM	139	};
	140
	141	static int __init xt_rateest_mt_init(void)
	142	{
55b69e91	143	return xt_register_match(&xt_rateest_mt_reg);
50c164a8 PM	144	}
	145
	146	static void __exit xt_rateest_mt_fini(void)
	147	{
55b69e91	148	xt_unregister_match(&xt_rateest_mt_reg);
50c164a8 PM	149	}
	150
	151	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
	152	MODULE_LICENSE("GPL");
	153	MODULE_DESCRIPTION("xtables rate estimator match");
	154	MODULE_ALIAS("ipt_rateest");
	155	MODULE_ALIAS("ip6t_rateest");
	156	module_init(xt_rateest_mt_init);
	157	module_exit(xt_rateest_mt_fini);