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#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        struct net *net = par->net;
  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        if (info->flags & XT_NFLOG_F_COPY_LEN)
  37                li.u.ulog.flags |= NF_LOG_F_COPY_LEN;
  38
  39        nfulnl_log_packet(net, par->family, par->hooknum, skb, par->in,
  40                          par->out, &li, info->prefix);
  41        return XT_CONTINUE;
  42}
  43
  44static int nflog_tg_check(const struct xt_tgchk_param *par)
  45{
  46        const struct xt_nflog_info *info = par->targinfo;
  47
  48        if (info->flags & ~XT_NFLOG_MASK)
  49                return -EINVAL;
  50        if (info->prefix[sizeof(info->prefix) - 1] != '\0')
  51                return -EINVAL;
  52        return 0;
  53}
  54
  55static struct xt_target nflog_tg_reg __read_mostly = {
  56        .name       = "NFLOG",
  57        .revision   = 0,
  58        .family     = NFPROTO_UNSPEC,
  59        .checkentry = nflog_tg_check,
  60        .target     = nflog_tg,
  61        .targetsize = sizeof(struct xt_nflog_info),
  62        .me         = THIS_MODULE,
  63};
  64
  65static int __init nflog_tg_init(void)
  66{
  67        return xt_register_target(&nflog_tg_reg);
  68}
  69
  70static void __exit nflog_tg_exit(void)
  71{
  72        xt_unregister_target(&nflog_tg_reg);
  73}
  74
  75module_init(nflog_tg_init);
  76module_exit(nflog_tg_exit);
  77