Release 4.11 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;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 305 | 87.39% | 2 | 33.33% |
Eric Dumazet | 40 | 11.46% | 2 | 33.33% |
Jan Engelhardt | 4 | 1.15% | 2 | 33.33% |
Total | 349 | 100.00% | 6 | 100.00% |
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;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 153 | 87.43% | 1 | 16.67% |
Jan Engelhardt | 15 | 8.57% | 4 | 66.67% |
Eric Dumazet | 7 | 4.00% | 1 | 16.67% |
Total | 175 | 100.00% | 6 | 100.00% |
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);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 37 | 90.24% | 1 | 50.00% |
Jan Engelhardt | 4 | 9.76% | 1 | 50.00% |
Total | 41 | 100.00% | 2 | 100.00% |
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);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 13 | 81.25% | 1 | 50.00% |
Jan Engelhardt | 3 | 18.75% | 1 | 50.00% |
Total | 16 | 100.00% | 2 | 100.00% |
static void __exit xt_rateest_mt_fini(void)
{
xt_unregister_match(&xt_rateest_mt_reg);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 12 | 80.00% | 1 | 50.00% |
Jan Engelhardt | 3 | 20.00% | 1 | 50.00% |
Total | 15 | 100.00% | 2 | 100.00% |
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);
Overall Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 622 | 87.24% | 2 | 14.29% |
Eric Dumazet | 47 | 6.59% | 3 | 21.43% |
Jan Engelhardt | 33 | 4.63% | 8 | 57.14% |
Willem de Bruijn | 11 | 1.54% | 1 | 7.14% |
Total | 713 | 100.00% | 14 | 100.00% |
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