lis3: add support for the HP EliteBook 8530w
[linux-2.6/mini2440.git] / net / netfilter / xt_rateest.c
blob4fc6a917f6de5b30d55de8dba82531be03e67826
1 /*
2 * (C) 2007 Patrick McHardy <kaber@trash.net>
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>
12 #include <linux/netfilter/x_tables.h>
13 #include <linux/netfilter/xt_rateest.h>
14 #include <net/netfilter/xt_rateest.h>
17 static bool
18 xt_rateest_mt(const struct sk_buff *skb, const struct xt_match_param *par)
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;
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;
34 spin_unlock_bh(&info->est1->lock);
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;
49 spin_unlock_bh(&info->est2->lock);
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;
73 ret ^= info->flags & XT_RATEEST_MATCH_INVERT ? true : false;
74 return ret;
77 static bool xt_rateest_mt_checkentry(const struct xt_mtchk_param *par)
79 struct xt_rateest_match_info *info = par->matchinfo;
80 struct xt_rateest *est1, *est2;
82 if (hweight32(info->flags & (XT_RATEEST_MATCH_ABS |
83 XT_RATEEST_MATCH_REL)) != 1)
84 goto err1;
86 if (!(info->flags & (XT_RATEEST_MATCH_BPS | XT_RATEEST_MATCH_PPS)))
87 goto err1;
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;
98 est1 = xt_rateest_lookup(info->name1);
99 if (!est1)
100 goto err1;
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;
110 info->est1 = est1;
111 info->est2 = est2;
112 return true;
114 err2:
115 xt_rateest_put(est1);
116 err1:
117 return false;
120 static void xt_rateest_mt_destroy(const struct xt_mtdtor_param *par)
122 struct xt_rateest_match_info *info = par->matchinfo;
124 xt_rateest_put(info->est1);
125 if (info->est2)
126 xt_rateest_put(info->est2);
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,
140 static int __init xt_rateest_mt_init(void)
142 return xt_register_match(&xt_rateest_mt_reg);
145 static void __exit xt_rateest_mt_fini(void)
147 xt_unregister_match(&xt_rateest_mt_reg);
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);