1
2
3
4
5
6
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
18MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
19MODULE_DESCRIPTION("Xtables: packet logging to netlink using NFLOG");
20MODULE_LICENSE("GPL");
21MODULE_ALIAS("ipt_NFLOG");
22MODULE_ALIAS("ip6t_NFLOG");
23
24static unsigned int
25nflog_tg(struct sk_buff *skb, const struct xt_target_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
40static bool 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 false;
46 if (info->prefix[sizeof(info->prefix) - 1] != '\0')
47 return false;
48 return true;
49}
50
51static 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
61static int __init nflog_tg_init(void)
62{
63 return xt_register_target(&nflog_tg_reg);
64}
65
66static void __exit nflog_tg_exit(void)
67{
68 xt_unregister_target(&nflog_tg_reg);
69}
70
71module_init(nflog_tg_init);
72module_exit(nflog_tg_exit);
73