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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * (C) 2007 Patrick McHardy <kaber@trash.net>
4 */
5#include <linux/module.h>
6#include <linux/skbuff.h>
7#include <linux/gen_stats.h>
8
9#include <linux/netfilter/x_tables.h>
10#include <linux/netfilter/xt_rateest.h>
11#include <net/netfilter/xt_rateest.h>
12
13
14static bool
15xt_rateest_mt(const struct sk_buff *skb, struct xt_action_param *par)
16{
17 const struct xt_rateest_match_info *info = par->matchinfo;
18 struct gnet_stats_rate_est64 sample = {0};
19 u_int32_t bps1, bps2, pps1, pps2;
20 bool ret = true;
21
22 gen_estimator_read(&info->est1->rate_est, &sample);
23
24 if (info->flags & XT_RATEEST_MATCH_DELTA) {
25 bps1 = info->bps1 >= sample.bps ? info->bps1 - sample.bps : 0;
26 pps1 = info->pps1 >= sample.pps ? info->pps1 - sample.pps : 0;
27 } else {
28 bps1 = sample.bps;
29 pps1 = sample.pps;
30 }
31
32 if (info->flags & XT_RATEEST_MATCH_ABS) {
33 bps2 = info->bps2;
34 pps2 = info->pps2;
35 } else {
36 gen_estimator_read(&info->est2->rate_est, &sample);
37
38 if (info->flags & XT_RATEEST_MATCH_DELTA) {
39 bps2 = info->bps2 >= sample.bps ? info->bps2 - sample.bps : 0;
40 pps2 = info->pps2 >= sample.pps ? info->pps2 - sample.pps : 0;
41 } else {
42 bps2 = sample.bps;
43 pps2 = sample.pps;
44 }
45 }
46
47 switch (info->mode) {
48 case XT_RATEEST_MATCH_LT:
49 if (info->flags & XT_RATEEST_MATCH_BPS)
50 ret &= bps1 < bps2;
51 if (info->flags & XT_RATEEST_MATCH_PPS)
52 ret &= pps1 < pps2;
53 break;
54 case XT_RATEEST_MATCH_GT:
55 if (info->flags & XT_RATEEST_MATCH_BPS)
56 ret &= bps1 > bps2;
57 if (info->flags & XT_RATEEST_MATCH_PPS)
58 ret &= pps1 > pps2;
59 break;
60 case XT_RATEEST_MATCH_EQ:
61 if (info->flags & XT_RATEEST_MATCH_BPS)
62 ret &= bps1 == bps2;
63 if (info->flags & XT_RATEEST_MATCH_PPS)
64 ret &= pps1 == pps2;
65 break;
66 }
67
68 ret ^= info->flags & XT_RATEEST_MATCH_INVERT ? true : false;
69 return ret;
70}
71
72static int xt_rateest_mt_checkentry(const struct xt_mtchk_param *par)
73{
74 struct xt_rateest_match_info *info = par->matchinfo;
75 struct xt_rateest *est1, *est2;
76 int ret = -EINVAL;
77
78 if (hweight32(info->flags & (XT_RATEEST_MATCH_ABS |
79 XT_RATEEST_MATCH_REL)) != 1)
80 goto err1;
81
82 if (!(info->flags & (XT_RATEEST_MATCH_BPS | XT_RATEEST_MATCH_PPS)))
83 goto err1;
84
85 switch (info->mode) {
86 case XT_RATEEST_MATCH_EQ:
87 case XT_RATEEST_MATCH_LT:
88 case XT_RATEEST_MATCH_GT:
89 break;
90 default:
91 goto err1;
92 }
93
94 ret = -ENOENT;
95 est1 = xt_rateest_lookup(par->net, info->name1);
96 if (!est1)
97 goto err1;
98
99 est2 = NULL;
100 if (info->flags & XT_RATEEST_MATCH_REL) {
101 est2 = xt_rateest_lookup(par->net, info->name2);
102 if (!est2)
103 goto err2;
104 }
105
106 info->est1 = est1;
107 info->est2 = est2;
108 return 0;
109
110err2:
111 xt_rateest_put(par->net, est1);
112err1:
113 return ret;
114}
115
116static void xt_rateest_mt_destroy(const struct xt_mtdtor_param *par)
117{
118 struct xt_rateest_match_info *info = par->matchinfo;
119
120 xt_rateest_put(par->net, info->est1);
121 if (info->est2)
122 xt_rateest_put(par->net, info->est2);
123}
124
125static struct xt_match xt_rateest_mt_reg __read_mostly = {
126 .name = "rateest",
127 .revision = 0,
128 .family = NFPROTO_UNSPEC,
129 .match = xt_rateest_mt,
130 .checkentry = xt_rateest_mt_checkentry,
131 .destroy = xt_rateest_mt_destroy,
132 .matchsize = sizeof(struct xt_rateest_match_info),
133 .usersize = offsetof(struct xt_rateest_match_info, est1),
134 .me = THIS_MODULE,
135};
136
137static int __init xt_rateest_mt_init(void)
138{
139 return xt_register_match(&xt_rateest_mt_reg);
140}
141
142static void __exit xt_rateest_mt_fini(void)
143{
144 xt_unregister_match(&xt_rateest_mt_reg);
145}
146
147MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
148MODULE_LICENSE("GPL");
149MODULE_DESCRIPTION("xtables rate estimator match");
150MODULE_ALIAS("ipt_rateest");
151MODULE_ALIAS("ip6t_rateest");
152module_init(xt_rateest_mt_init);
153module_exit(xt_rateest_mt_fini);
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
17static bool
18xt_rateest_mt(const struct sk_buff *skb, struct xt_action_param *par)
19{
20 const struct xt_rateest_match_info *info = par->matchinfo;
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 &= pps1 == pps2;
70 break;
71 }
72
73 ret ^= info->flags & XT_RATEEST_MATCH_INVERT ? true : false;
74 return ret;
75}
76
77static int xt_rateest_mt_checkentry(const struct xt_mtchk_param *par)
78{
79 struct xt_rateest_match_info *info = par->matchinfo;
80 struct xt_rateest *est1, *est2;
81 int ret = -EINVAL;
82
83 if (hweight32(info->flags & (XT_RATEEST_MATCH_ABS |
84 XT_RATEEST_MATCH_REL)) != 1)
85 goto err1;
86
87 if (!(info->flags & (XT_RATEEST_MATCH_BPS | XT_RATEEST_MATCH_PPS)))
88 goto err1;
89
90 switch (info->mode) {
91 case XT_RATEEST_MATCH_EQ:
92 case XT_RATEEST_MATCH_LT:
93 case XT_RATEEST_MATCH_GT:
94 break;
95 default:
96 goto err1;
97 }
98
99 ret = -ENOENT;
100 est1 = xt_rateest_lookup(info->name1);
101 if (!est1)
102 goto err1;
103
104 est2 = NULL;
105 if (info->flags & XT_RATEEST_MATCH_REL) {
106 est2 = xt_rateest_lookup(info->name2);
107 if (!est2)
108 goto err2;
109 }
110
111 info->est1 = est1;
112 info->est2 = est2;
113 return 0;
114
115err2:
116 xt_rateest_put(est1);
117err1:
118 return ret;
119}
120
121static void xt_rateest_mt_destroy(const struct xt_mtdtor_param *par)
122{
123 struct xt_rateest_match_info *info = par->matchinfo;
124
125 xt_rateest_put(info->est1);
126 if (info->est2)
127 xt_rateest_put(info->est2);
128}
129
130static 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,
139};
140
141static int __init xt_rateest_mt_init(void)
142{
143 return xt_register_match(&xt_rateest_mt_reg);
144}
145
146static void __exit xt_rateest_mt_fini(void)
147{
148 xt_unregister_match(&xt_rateest_mt_reg);
149}
150
151MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
152MODULE_LICENSE("GPL");
153MODULE_DESCRIPTION("xtables rate estimator match");
154MODULE_ALIAS("ipt_rateest");
155MODULE_ALIAS("ip6t_rateest");
156module_init(xt_rateest_mt_init);
157module_exit(xt_rateest_mt_fini);