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 struct xt_target *target,
  32        const void *targinfo,
  33        void *userinfo)
  34 {
  35         const struct xt_classify_target_info *clinfo = targinfo;
  36
  37         if ((*pskb)->priority != clinfo->priority)
  38                 (*pskb)->priority = clinfo->priority;
  39
  40         return XT_CONTINUE;
  41 }
  42
  43 static struct xt_target classify_reg = {
  44         .name           = "CLASSIFY",
  45         .target         = target,
  46         .targetsize     = sizeof(struct xt_classify_target_info),
  47         .table          = "mangle",
  48         .hooks          = (1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_FORWARD) |
  49                           (1 << NF_IP_POST_ROUTING),
  50         .family         = AF_INET,
  51         .me             = THIS_MODULE,
  52 };
  53 static struct xt_target classify6_reg = {
  54         .name           = "CLASSIFY",
  55         .target         = target,
  56         .targetsize     = sizeof(struct xt_classify_target_info),
  57         .table          = "mangle",
  58         .hooks          = (1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_FORWARD) |
  59                           (1 << NF_IP_POST_ROUTING),
  60         .family         = AF_INET6,
  61         .me             = THIS_MODULE,
  62 };
  63
  64
  65 static int __init init(void)
  66 {
  67         int ret;
  68
  69         ret = xt_register_target(&classify_reg);
  70         if (ret)
  71                 return ret;
  72
  73         ret = xt_register_target(&classify6_reg);
  74         if (ret)
  75                 xt_unregister_target(&classify_reg);
  76
  77         return ret;
  78 }
  79
  80 static void __exit fini(void)
  81 {
  82         xt_unregister_target(&classify_reg);
  83         xt_unregister_target(&classify6_reg);
  84 }
  85
  86 module_init(init);
  87 module_exit(fini);