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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 | 17 | static bool |
62fc8051 | 18 | xt_rateest_mt(const struct sk_buff *skb, struct xt_action_param *par) |
50c164a8 | 19 | { |
f7108a20 | 20 | const struct xt_rateest_match_info *info = par->matchinfo; |
1c0d32fd | 21 | struct gnet_stats_rate_est64 sample = {0}; |
50c164a8 PM |
22 | u_int32_t bps1, bps2, pps1, pps2; |
23 | bool ret = true; | |
24 | ||
1c0d32fd ED |
25 | gen_estimator_read(&info->est1->rate_est, &sample); |
26 | ||
50c164a8 | 27 | if (info->flags & XT_RATEEST_MATCH_DELTA) { |
1c0d32fd ED |
28 | bps1 = info->bps1 >= sample.bps ? info->bps1 - sample.bps : 0; |
29 | pps1 = info->pps1 >= sample.pps ? info->pps1 - sample.pps : 0; | |
50c164a8 | 30 | } else { |
1c0d32fd ED |
31 | bps1 = sample.bps; |
32 | pps1 = sample.pps; | |
50c164a8 | 33 | } |
50c164a8 PM |
34 | |
35 | if (info->flags & XT_RATEEST_MATCH_ABS) { | |
36 | bps2 = info->bps2; | |
37 | pps2 = info->pps2; | |
38 | } else { | |
1c0d32fd ED |
39 | gen_estimator_read(&info->est2->rate_est, &sample); |
40 | ||
50c164a8 | 41 | if (info->flags & XT_RATEEST_MATCH_DELTA) { |
1c0d32fd ED |
42 | bps2 = info->bps2 >= sample.bps ? info->bps2 - sample.bps : 0; |
43 | pps2 = info->pps2 >= sample.pps ? info->pps2 - sample.pps : 0; | |
50c164a8 | 44 | } else { |
1c0d32fd ED |
45 | bps2 = sample.bps; |
46 | pps2 = sample.pps; | |
50c164a8 | 47 | } |
50c164a8 PM |
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) | |
4d900f9d | 67 | ret &= pps1 == pps2; |
50c164a8 PM |
68 | break; |
69 | } | |
70 | ||
71 | ret ^= info->flags & XT_RATEEST_MATCH_INVERT ? true : false; | |
72 | return ret; | |
73 | } | |
74 | ||
b0f38452 | 75 | static int xt_rateest_mt_checkentry(const struct xt_mtchk_param *par) |
50c164a8 | 76 | { |
9b4fce7a | 77 | struct xt_rateest_match_info *info = par->matchinfo; |
50c164a8 | 78 | struct xt_rateest *est1, *est2; |
00fe1ae9 | 79 | int ret = -EINVAL; |
50c164a8 PM |
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 | ||
4a5a5c73 | 97 | ret = -ENOENT; |
50c164a8 PM |
98 | est1 = xt_rateest_lookup(info->name1); |
99 | if (!est1) | |
100 | goto err1; | |
101 | ||
00fe1ae9 | 102 | est2 = NULL; |
50c164a8 PM |
103 | if (info->flags & XT_RATEEST_MATCH_REL) { |
104 | est2 = xt_rateest_lookup(info->name2); | |
105 | if (!est2) | |
106 | goto err2; | |
00fe1ae9 | 107 | } |
50c164a8 PM |
108 | |
109 | info->est1 = est1; | |
110 | info->est2 = est2; | |
bd414ee6 | 111 | return 0; |
50c164a8 PM |
112 | |
113 | err2: | |
114 | xt_rateest_put(est1); | |
115 | err1: | |
00fe1ae9 | 116 | return ret; |
50c164a8 PM |
117 | } |
118 | ||
6be3d859 | 119 | static void xt_rateest_mt_destroy(const struct xt_mtdtor_param *par) |
50c164a8 | 120 | { |
6be3d859 | 121 | struct xt_rateest_match_info *info = par->matchinfo; |
50c164a8 PM |
122 | |
123 | xt_rateest_put(info->est1); | |
124 | if (info->est2) | |
125 | xt_rateest_put(info->est2); | |
126 | } | |
127 | ||
55b69e91 JE |
128 | static 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), | |
ec231890 | 136 | .usersize = offsetof(struct xt_rateest_match_info, est1), |
55b69e91 | 137 | .me = THIS_MODULE, |
50c164a8 PM |
138 | }; |
139 | ||
140 | static int __init xt_rateest_mt_init(void) | |
141 | { | |
55b69e91 | 142 | return xt_register_match(&xt_rateest_mt_reg); |
50c164a8 PM |
143 | } |
144 | ||
145 | static void __exit xt_rateest_mt_fini(void) | |
146 | { | |
55b69e91 | 147 | xt_unregister_match(&xt_rateest_mt_reg); |
50c164a8 PM |
148 | } |
149 | ||
150 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
151 | MODULE_LICENSE("GPL"); | |
152 | MODULE_DESCRIPTION("xtables rate estimator match"); | |
153 | MODULE_ALIAS("ipt_rateest"); | |
154 | MODULE_ALIAS("ip6t_rateest"); | |
155 | module_init(xt_rateest_mt_init); | |
156 | module_exit(xt_rateest_mt_fini); |