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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 JE |
17 | static bool |
18 | xt_rateest_mt(const struct sk_buff *skb, const struct xt_match_param *par) | |
50c164a8 | 19 | { |
f7108a20 | 20 | const struct xt_rateest_match_info *info = par->matchinfo; |
50c164a8 PM |
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) | |
4d900f9d | 69 | ret &= pps1 == pps2; |
50c164a8 PM |
70 | break; |
71 | } | |
72 | ||
73 | ret ^= info->flags & XT_RATEEST_MATCH_INVERT ? true : false; | |
74 | return ret; | |
75 | } | |
76 | ||
9b4fce7a | 77 | static bool xt_rateest_mt_checkentry(const struct xt_mtchk_param *par) |
50c164a8 | 78 | { |
9b4fce7a | 79 | struct xt_rateest_match_info *info = par->matchinfo; |
50c164a8 PM |
80 | struct xt_rateest *est1, *est2; |
81 | ||
82 | if (hweight32(info->flags & (XT_RATEEST_MATCH_ABS | | |
83 | XT_RATEEST_MATCH_REL)) != 1) | |
84 | goto err1; | |
85 | ||
86 | if (!(info->flags & (XT_RATEEST_MATCH_BPS | XT_RATEEST_MATCH_PPS))) | |
87 | goto err1; | |
88 | ||
89 | switch (info->mode) { | |
90 | case XT_RATEEST_MATCH_EQ: | |
91 | case XT_RATEEST_MATCH_LT: | |
92 | case XT_RATEEST_MATCH_GT: | |
93 | break; | |
94 | default: | |
95 | goto err1; | |
96 | } | |
97 | ||
98 | est1 = xt_rateest_lookup(info->name1); | |
99 | if (!est1) | |
100 | goto err1; | |
101 | ||
102 | if (info->flags & XT_RATEEST_MATCH_REL) { | |
103 | est2 = xt_rateest_lookup(info->name2); | |
104 | if (!est2) | |
105 | goto err2; | |
106 | } else | |
107 | est2 = NULL; | |
108 | ||
109 | ||
110 | info->est1 = est1; | |
111 | info->est2 = est2; | |
112 | return true; | |
113 | ||
114 | err2: | |
115 | xt_rateest_put(est1); | |
116 | err1: | |
117 | return false; | |
118 | } | |
119 | ||
6be3d859 | 120 | static void xt_rateest_mt_destroy(const struct xt_mtdtor_param *par) |
50c164a8 | 121 | { |
6be3d859 | 122 | struct xt_rateest_match_info *info = par->matchinfo; |
50c164a8 PM |
123 | |
124 | xt_rateest_put(info->est1); | |
125 | if (info->est2) | |
126 | xt_rateest_put(info->est2); | |
127 | } | |
128 | ||
55b69e91 JE |
129 | static struct xt_match xt_rateest_mt_reg __read_mostly = { |
130 | .name = "rateest", | |
131 | .revision = 0, | |
132 | .family = NFPROTO_UNSPEC, | |
133 | .match = xt_rateest_mt, | |
134 | .checkentry = xt_rateest_mt_checkentry, | |
135 | .destroy = xt_rateest_mt_destroy, | |
136 | .matchsize = sizeof(struct xt_rateest_match_info), | |
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); |