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Linux/net/netfilter/xt_rateest.c

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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 
 17 static bool
 18 xt_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 
 75 static 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 
113 err2:
114         xt_rateest_put(est1);
115 err1:
116         return ret;
117 }
118 
119 static 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 
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),
136         .me         = THIS_MODULE,
137 };
138 
139 static int __init xt_rateest_mt_init(void)
140 {
141         return xt_register_match(&xt_rateest_mt_reg);
142 }
143 
144 static void __exit xt_rateest_mt_fini(void)
145 {
146         xt_unregister_match(&xt_rateest_mt_reg);
147 }
148 
149 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
150 MODULE_LICENSE("GPL");
151 MODULE_DESCRIPTION("xtables rate estimator match");
152 MODULE_ALIAS("ipt_rateest");
153 MODULE_ALIAS("ip6t_rateest");
154 module_init(xt_rateest_mt_init);
155 module_exit(xt_rateest_mt_fini);
156 

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