net/netfilter/xt_NFLOG.c

   1 /*
   2  * Copyright (c) 2006 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
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/skbuff.h>
  12
  13 #include <linux/netfilter/x_tables.h>
  14 #include <linux/netfilter/xt_NFLOG.h>
  15 #include <net/netfilter/nf_log.h>
  16 #include <net/netfilter/nfnetlink_log.h>
  17
  18 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
  19 MODULE_DESCRIPTION("Xtables: packet logging to netlink using NFLOG");
  20 MODULE_LICENSE("GPL");
  21 MODULE_ALIAS("ipt_NFLOG");
  22 MODULE_ALIAS("ip6t_NFLOG");
  23
  24 static unsigned int
  25 nflog_tg(struct sk_buff *skb, const struct xt_action_param *par)
  26 {
  27         const struct xt_nflog_info *info = par->targinfo;
  28         struct nf_loginfo li;
  29         struct net *net = dev_net(par->in ? par->in : par->out);
  30
  31         li.type              = NF_LOG_TYPE_ULOG;
  32         li.u.ulog.copy_len   = info->len;
  33         li.u.ulog.group      = info->group;
  34         li.u.ulog.qthreshold = info->threshold;
  35
  36         nfulnl_log_packet(net, par->family, par->hooknum, skb, par->in,
  37                           par->out, &li, info->prefix);
  38         return XT_CONTINUE;
  39 }
  40
  41 static int nflog_tg_check(const struct xt_tgchk_param *par)
  42 {
  43         const struct xt_nflog_info *info = par->targinfo;
  44
  45         if (info->flags & ~XT_NFLOG_MASK)
  46                 return -EINVAL;
  47         if (info->prefix[sizeof(info->prefix) - 1] != '\0')
  48                 return -EINVAL;
  49         return 0;
  50 }
  51
  52 static struct xt_target nflog_tg_reg __read_mostly = {
  53         .name       = "NFLOG",
  54         .revision   = 0,
  55         .family     = NFPROTO_UNSPEC,
  56         .checkentry = nflog_tg_check,
  57         .target     = nflog_tg,
  58         .targetsize = sizeof(struct xt_nflog_info),
  59         .me         = THIS_MODULE,
  60 };
  61
  62 static int __init nflog_tg_init(void)
  63 {
  64         return xt_register_target(&nflog_tg_reg);
  65 }
  66
  67 static void __exit nflog_tg_exit(void)
  68 {
  69         xt_unregister_target(&nflog_tg_reg);
  70 }
  71
  72 module_init(nflog_tg_init);
  73 module_exit(nflog_tg_exit);