mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
153 lines
3.6 KiB
C
153 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* (C) 2007 Patrick McHardy <kaber@trash.net>
|
|
*/
|
|
#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(par->net, info->name1);
|
|
if (!est1)
|
|
goto err1;
|
|
|
|
est2 = NULL;
|
|
if (info->flags & XT_RATEEST_MATCH_REL) {
|
|
est2 = xt_rateest_lookup(par->net, info->name2);
|
|
if (!est2)
|
|
goto err2;
|
|
}
|
|
|
|
info->est1 = est1;
|
|
info->est2 = est2;
|
|
return 0;
|
|
|
|
err2:
|
|
xt_rateest_put(par->net, 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(par->net, info->est1);
|
|
if (info->est2)
|
|
xt_rateest_put(par->net, 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);
|