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