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