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.
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>
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;
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;
34 spin_unlock_bh(&info->est1->lock);
36 if (info->flags & XT_RATEEST_MATCH_ABS) {
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;
49 spin_unlock_bh(&info->est2->lock);
53 case XT_RATEEST_MATCH_LT:
54 if (info->flags & XT_RATEEST_MATCH_BPS)
56 if (info->flags & XT_RATEEST_MATCH_PPS)
59 case XT_RATEEST_MATCH_GT:
60 if (info->flags & XT_RATEEST_MATCH_BPS)
62 if (info->flags & XT_RATEEST_MATCH_PPS)
65 case XT_RATEEST_MATCH_EQ:
66 if (info->flags & XT_RATEEST_MATCH_BPS)
68 if (info->flags & XT_RATEEST_MATCH_PPS)
73 ret ^= info->flags & XT_RATEEST_MATCH_INVERT ? true : false;
77 static bool xt_rateest_mt_checkentry(const char *tablename,
79 const struct xt_match *match,
81 unsigned int hook_mask)
83 struct xt_rateest_match_info *info = matchinfo;
84 struct xt_rateest *est1, *est2;
86 if (hweight32(info->flags & (XT_RATEEST_MATCH_ABS |
87 XT_RATEEST_MATCH_REL)) != 1)
90 if (!(info->flags & (XT_RATEEST_MATCH_BPS | XT_RATEEST_MATCH_PPS)))
94 case XT_RATEEST_MATCH_EQ:
95 case XT_RATEEST_MATCH_LT:
96 case XT_RATEEST_MATCH_GT:
102 est1 = xt_rateest_lookup(info->name1);
106 if (info->flags & XT_RATEEST_MATCH_REL) {
107 est2 = xt_rateest_lookup(info->name2);
119 xt_rateest_put(est1);
124 static void xt_rateest_mt_destroy(const struct xt_match *match,
127 struct xt_rateest_match_info *info = matchinfo;
129 xt_rateest_put(info->est1);
131 xt_rateest_put(info->est2);
134 static struct xt_match xt_rateest_mt_reg __read_mostly = {
137 .family = NFPROTO_UNSPEC,
138 .match = xt_rateest_mt,
139 .checkentry = xt_rateest_mt_checkentry,
140 .destroy = xt_rateest_mt_destroy,
141 .matchsize = sizeof(struct xt_rateest_match_info),
145 static int __init xt_rateest_mt_init(void)
147 return xt_register_match(&xt_rateest_mt_reg);
150 static void __exit xt_rateest_mt_fini(void)
152 xt_unregister_match(&xt_rateest_mt_reg);
155 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
156 MODULE_LICENSE("GPL");
157 MODULE_DESCRIPTION("xtables rate estimator match");
158 MODULE_ALIAS("ipt_rateest");
159 MODULE_ALIAS("ip6t_rateest");
160 module_init(xt_rateest_mt_init);
161 module_exit(xt_rateest_mt_fini);