Linux Kernel  3.7.1
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xt_NFLOG.c
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1 /*
2  * Copyright (c) 2006 Patrick McHardy <[email protected]>
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>
15 #include <net/netfilter/nf_log.h>
17 
18 MODULE_AUTHOR("Patrick McHardy <[email protected]>");
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 
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 
40 static 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 
51 static 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 
61 static int __init nflog_tg_init(void)
62 {
63  return xt_register_target(&nflog_tg_reg);
64 }
65 
66 static void __exit nflog_tg_exit(void)
67 {
68  xt_unregister_target(&nflog_tg_reg);
69 }
70 
71 module_init(nflog_tg_init);
72 module_exit(nflog_tg_exit);