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 = 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 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); 74