Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
17MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
18MODULE_DESCRIPTION("Xtables: packet logging to netlink using NFLOG");
19MODULE_LICENSE("GPL");
20MODULE_ALIAS("ipt_NFLOG");
21MODULE_ALIAS("ip6t_NFLOG");
22
23static unsigned int
24nflog_tg(struct sk_buff *skb, const struct xt_action_param *par)
25{
26 const struct xt_nflog_info *info = par->targinfo;
27 struct net *net = xt_net(par);
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 li.u.ulog.flags = 0;
35
36 if (info->flags & XT_NFLOG_F_COPY_LEN)
37 li.u.ulog.flags |= NF_LOG_F_COPY_LEN;
38
39 nf_log_packet(net, xt_family(par), xt_hooknum(par), skb, xt_in(par),
40 xt_out(par), &li, "%s", info->prefix);
41
42 return XT_CONTINUE;
43}
44
45static 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
54 return nf_logger_find_get(par->family, NF_LOG_TYPE_ULOG);
55}
56
57static void nflog_tg_destroy(const struct xt_tgdtor_param *par)
58{
59 nf_logger_put(par->family, NF_LOG_TYPE_ULOG);
60}
61
62static struct xt_target nflog_tg_reg __read_mostly = {
63 .name = "NFLOG",
64 .revision = 0,
65 .family = NFPROTO_UNSPEC,
66 .checkentry = nflog_tg_check,
67 .destroy = nflog_tg_destroy,
68 .target = nflog_tg,
69 .targetsize = sizeof(struct xt_nflog_info),
70 .me = THIS_MODULE,
71};
72
73static int __init nflog_tg_init(void)
74{
75 return xt_register_target(&nflog_tg_reg);
76}
77
78static void __exit nflog_tg_exit(void)
79{
80 xt_unregister_target(&nflog_tg_reg);
81}
82
83module_init(nflog_tg_init);
84module_exit(nflog_tg_exit);