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 {
  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 xt_classify_target[] = {
  43         {
  44                 .family         = AF_INET,
  45                 .name           = "CLASSIFY",
  46                 .target         = target,
  47                 .targetsize     = sizeof(struct xt_classify_target_info),
  48                 .table          = "mangle",
  49                 .hooks          = (1 << NF_IP_LOCAL_OUT) |
  50                                   (1 << NF_IP_FORWARD) |
  51                                   (1 << NF_IP_POST_ROUTING),
  52                 .me             = THIS_MODULE,
  53         },
  54         {
  55                 .name           = "CLASSIFY",
  56                 .family         = AF_INET6,
  57                 .target         = target,
  58                 .targetsize     = sizeof(struct xt_classify_target_info),
  59                 .table          = "mangle",
  60                 .hooks          = (1 << NF_IP_LOCAL_OUT) |
  61                                   (1 << NF_IP_FORWARD) |
  62                                   (1 << NF_IP_POST_ROUTING),
  63                 .me             = THIS_MODULE,
  64         },
  65 };
  66
  67 static int __init xt_classify_init(void)
  68 {
  69         return xt_register_targets(xt_classify_target,
  70                                    ARRAY_SIZE(xt_classify_target));
  71 }
  72
  73 static void __exit xt_classify_fini(void)
  74 {
  75         xt_unregister_targets(xt_classify_target,
  76                               ARRAY_SIZE(xt_classify_target));
  77 }
  78
  79 module_init(xt_classify_init);
  80 module_exit(xt_classify_fini);