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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_est64 sample = {0};
22 u_int32_t bps1, bps2, pps1, pps2;
23 bool ret = true;
24
25 gen_estimator_read(&info->est1->rate_est, &sample);
26
27 if (info->flags & XT_RATEEST_MATCH_DELTA) {
28 bps1 = info->bps1 >= sample.bps ? info->bps1 - sample.bps : 0;
29 pps1 = info->pps1 >= sample.pps ? info->pps1 - sample.pps : 0;
30 } else {
31 bps1 = sample.bps;
32 pps1 = sample.pps;
33 }
34
35 if (info->flags & XT_RATEEST_MATCH_ABS) {
36 bps2 = info->bps2;
37 pps2 = info->pps2;
38 } else {
39 gen_estimator_read(&info->est2->rate_est, &sample);
40
41 if (info->flags & XT_RATEEST_MATCH_DELTA) {
42 bps2 = info->bps2 >= sample.bps ? info->bps2 - sample.bps : 0;
43 pps2 = info->pps2 >= sample.pps ? info->pps2 - sample.pps : 0;
44 } else {
45 bps2 = sample.bps;
46 pps2 = sample.pps;
47 }
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)
67 ret &= pps1 == pps2;
68 break;
69 }
70
71 ret ^= info->flags & XT_RATEEST_MATCH_INVERT ? true : false;
72 return ret;
73}
74
75static int xt_rateest_mt_checkentry(const struct xt_mtchk_param *par)
76{
77 struct xt_rateest_match_info *info = par->matchinfo;
78 struct xt_rateest *est1, *est2;
79 int ret = -EINVAL;
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
97 ret = -ENOENT;
98 est1 = xt_rateest_lookup(info->name1);
99 if (!est1)
100 goto err1;
101
102 est2 = NULL;
103 if (info->flags & XT_RATEEST_MATCH_REL) {
104 est2 = xt_rateest_lookup(info->name2);
105 if (!est2)
106 goto err2;
107 }
108
109 info->est1 = est1;
110 info->est2 = est2;
111 return 0;
112
113err2:
114 xt_rateest_put(est1);
115err1:
116 return ret;
117}
118
119static void xt_rateest_mt_destroy(const struct xt_mtdtor_param *par)
120{
121 struct xt_rateest_match_info *info = par->matchinfo;
122
123 xt_rateest_put(info->est1);
124 if (info->est2)
125 xt_rateest_put(info->est2);
126}
127
128static 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),
136 .me = THIS_MODULE,
137};
138
139static int __init xt_rateest_mt_init(void)
140{
141 return xt_register_match(&xt_rateest_mt_reg);
142}
143
144static void __exit xt_rateest_mt_fini(void)
145{
146 xt_unregister_match(&xt_rateest_mt_reg);
147}
148
149MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
150MODULE_LICENSE("GPL");
151MODULE_DESCRIPTION("xtables rate estimator match");
152MODULE_ALIAS("ipt_rateest");
153MODULE_ALIAS("ip6t_rateest");
154module_init(xt_rateest_mt_init);
155module_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);