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 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 44 static 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 55 static 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 65 static int __init nflog_tg_init(void) 66 { 67 return xt_register_target(&nflog_tg_reg); 68 } 69 70 static void __exit nflog_tg_exit(void) 71 { 72 xt_unregister_target(&nflog_tg_reg); 73 } 74 75 module_init(nflog_tg_init); 76 module_exit(nflog_tg_exit); 77