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
nflog_tg(struct sk_buff * skb,const struct xt_action_param * par)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 li.u.ulog.flags = 0;
36
37 if (info->flags & XT_NFLOG_F_COPY_LEN)
38 li.u.ulog.flags |= NF_LOG_F_COPY_LEN;
39
40 nfulnl_log_packet(net, par->family, par->hooknum, skb, par->in,
41 par->out, &li, info->prefix);
42 return XT_CONTINUE;
43 }
44
nflog_tg_check(const struct xt_tgchk_param * par)45 static int nflog_tg_check(const struct xt_tgchk_param *par)
46 {
47 const struct xt_nflog_info *info = par->targinfo;
48
49 if (info->flags & ~XT_NFLOG_MASK)
50 return -EINVAL;
51 if (info->prefix[sizeof(info->prefix) - 1] != '\0')
52 return -EINVAL;
53 return 0;
54 }
55
56 static struct xt_target nflog_tg_reg __read_mostly = {
57 .name = "NFLOG",
58 .revision = 0,
59 .family = NFPROTO_UNSPEC,
60 .checkentry = nflog_tg_check,
61 .target = nflog_tg,
62 .targetsize = sizeof(struct xt_nflog_info),
63 .me = THIS_MODULE,
64 };
65
nflog_tg_init(void)66 static int __init nflog_tg_init(void)
67 {
68 return xt_register_target(&nflog_tg_reg);
69 }
70
nflog_tg_exit(void)71 static void __exit nflog_tg_exit(void)
72 {
73 xt_unregister_target(&nflog_tg_reg);
74 }
75
76 module_init(nflog_tg_init);
77 module_exit(nflog_tg_exit);
78