net/netfilter/xt_CLASSIFY.c

   1 /*
   2  * This is a module which is used for setting the skb->priority field
   3  * of an skb for qdisc classification.
   4  */
   5
   6 /* (C) 2001-2002 Patrick McHardy <kaber@trash.net>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/ip.h>
  16 #include <net/checksum.h>
  17
  18 #include <linux/netfilter/x_tables.h>
  19 #include <linux/netfilter/xt_CLASSIFY.h>
  20
  21 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
  22 MODULE_LICENSE("GPL");
  23 MODULE_DESCRIPTION("iptables qdisc classification target module");
  24 MODULE_ALIAS("ipt_CLASSIFY");
  25
  26 static unsigned int
  27 target(struct sk_buff **pskb,
  28        const struct net_device *in,
  29        const struct net_device *out,
  30        unsigned int hooknum,
  31        const void *targinfo,
  32        void *userinfo)
  33 {
  34         const struct xt_classify_target_info *clinfo = targinfo;
  35
  36         if ((*pskb)->priority != clinfo->priority)
  37                 (*pskb)->priority = clinfo->priority;
  38
  39         return XT_CONTINUE;
  40 }
  41
  42 static struct xt_target classify_reg = {
  43         .name           = "CLASSIFY",
  44         .target         = target,
  45         .targetsize     = sizeof(struct xt_classify_target_info),
  46         .table          = "mangle",
  47         .hooks          = (1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_FORWARD) |
  48                           (1 << NF_IP_POST_ROUTING),
  49         .me             = THIS_MODULE,
  50 };
  51 static struct xt_target classify6_reg = {
  52         .name           = "CLASSIFY",
  53         .target         = target,
  54         .targetsize     = sizeof(struct xt_classify_target_info),
  55         .table          = "mangle",
  56         .hooks          = (1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_FORWARD) |
  57                           (1 << NF_IP_POST_ROUTING),
  58         .me             = THIS_MODULE,
  59 };
  60
  61
  62 static int __init init(void)
  63 {
  64         int ret;
  65
  66         ret = xt_register_target(AF_INET, &classify_reg);
  67         if (ret)
  68                 return ret;
  69
  70         ret = xt_register_target(AF_INET6, &classify6_reg);
  71         if (ret)
  72                 xt_unregister_target(AF_INET, &classify_reg);
  73
  74         return ret;
  75 }
  76
  77 static void __exit fini(void)
  78 {
  79         xt_unregister_target(AF_INET, &classify_reg);
  80         xt_unregister_target(AF_INET6, &classify6_reg);
  81 }
  82
  83 module_init(init);
  84 module_exit(fini);