LXR linux/net/netfilter/xt

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