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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 
 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 

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