net/netfilter/xt_NFQUEUE.c

   1 /* iptables module for using new netfilter netlink queue
   2  *
   3  * (C) 2005 by Harald Welte <laforge@netfilter.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/skbuff.h>
  13
  14 #include <linux/netfilter.h>
  15 #include <linux/netfilter_arp.h>
  16 #include <linux/netfilter/x_tables.h>
  17 #include <linux/netfilter/xt_NFQUEUE.h>
  18
  19 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
  20 MODULE_DESCRIPTION("[ip,ip6,arp]_tables NFQUEUE target");
  21 MODULE_LICENSE("GPL");
  22 MODULE_ALIAS("ipt_NFQUEUE");
  23 MODULE_ALIAS("ip6t_NFQUEUE");
  24 MODULE_ALIAS("arpt_NFQUEUE");
  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_NFQ_info *tinfo = targinfo;
  35
  36         return NF_QUEUE_NR(tinfo->queuenum);
  37 }
  38
  39 static int
  40 checkentry(const char *tablename,
  41            const void *entry,
  42            void *targinfo,
  43            unsigned int targinfosize,
  44            unsigned int hook_mask)
  45 {
  46         if (targinfosize != XT_ALIGN(sizeof(struct xt_NFQ_info))) {
  47                 printk(KERN_WARNING "NFQUEUE: targinfosize %u != %Zu\n",
  48                        targinfosize,
  49                        XT_ALIGN(sizeof(struct xt_NFQ_info)));
  50                 return 0;
  51         }
  52
  53         return 1;
  54 }
  55
  56 static struct xt_target ipt_NFQ_reg = {
  57         .name           = "NFQUEUE",
  58         .target         = target,
  59         .checkentry     = checkentry,
  60         .me             = THIS_MODULE,
  61 };
  62
  63 static struct xt_target ip6t_NFQ_reg = {
  64         .name           = "NFQUEUE",
  65         .target         = target,
  66         .checkentry     = checkentry,
  67         .me             = THIS_MODULE,
  68 };
  69
  70 static struct xt_target arpt_NFQ_reg = {
  71         .name           = "NFQUEUE",
  72         .target         = target,
  73         .checkentry     = checkentry,
  74         .me             = THIS_MODULE,
  75 };
  76
  77 static int __init init(void)
  78 {
  79         int ret;
  80         ret = xt_register_target(AF_INET, &ipt_NFQ_reg);
  81         if (ret)
  82                 return ret;
  83         ret = xt_register_target(AF_INET6, &ip6t_NFQ_reg);
  84         if (ret)
  85                 goto out_ip;
  86         ret = xt_register_target(NF_ARP, &arpt_NFQ_reg);
  87         if (ret)
  88                 goto out_ip6;
  89
  90         return ret;
  91 out_ip6:
  92         xt_unregister_target(AF_INET6, &ip6t_NFQ_reg);
  93 out_ip:
  94         xt_unregister_target(AF_INET, &ipt_NFQ_reg);
  95
  96         return ret;
  97 }
  98
  99 static void __exit fini(void)
 100 {
 101         xt_unregister_target(NF_ARP, &arpt_NFQ_reg);
 102         xt_unregister_target(AF_INET6, &ip6t_NFQ_reg);
 103         xt_unregister_target(AF_INET, &ipt_NFQ_reg);
 104 }
 105
 106 module_init(init);
 107 module_exit(fini);