1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2006 Patrick McHardy <kaber@trash.net>
4 */
5
6 #include <linux/module.h>
7 #include <linux/init.h>
8 #include <linux/skbuff.h>
9
10 #include <linux/netfilter/x_tables.h>
11 #include <linux/netfilter/xt_NFLOG.h>
12 #include <net/netfilter/nf_log.h>
13
14 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
15 MODULE_DESCRIPTION("Xtables: packet logging to netlink using NFLOG");
16 MODULE_LICENSE("GPL");
17 MODULE_ALIAS("ipt_NFLOG");
18 MODULE_ALIAS("ip6t_NFLOG");
19
20 static unsigned int
nflog_tg(struct sk_buff * skb,const struct xt_action_param * par)21 nflog_tg(struct sk_buff *skb, const struct xt_action_param *par)
22 {
23 const struct xt_nflog_info *info = par->targinfo;
24 struct net *net = xt_net(par);
25 struct nf_loginfo li;
26
27 li.type = NF_LOG_TYPE_ULOG;
28 li.u.ulog.copy_len = info->len;
29 li.u.ulog.group = info->group;
30 li.u.ulog.qthreshold = info->threshold;
31 li.u.ulog.flags = 0;
32
33 if (info->flags & XT_NFLOG_F_COPY_LEN)
34 li.u.ulog.flags |= NF_LOG_F_COPY_LEN;
35
36 nf_log_packet(net, xt_family(par), xt_hooknum(par), skb, xt_in(par),
37 xt_out(par), &li, "%s", info->prefix);
38
39 return XT_CONTINUE;
40 }
41
nflog_tg_check(const struct xt_tgchk_param * par)42 static int nflog_tg_check(const struct xt_tgchk_param *par)
43 {
44 const struct xt_nflog_info *info = par->targinfo;
45
46 if (info->flags & ~XT_NFLOG_MASK)
47 return -EINVAL;
48 if (info->prefix[sizeof(info->prefix) - 1] != '\0')
49 return -EINVAL;
50
51 return nf_logger_find_get(par->family, NF_LOG_TYPE_ULOG);
52 }
53
nflog_tg_destroy(const struct xt_tgdtor_param * par)54 static void nflog_tg_destroy(const struct xt_tgdtor_param *par)
55 {
56 nf_logger_put(par->family, NF_LOG_TYPE_ULOG);
57 }
58
59 static struct xt_target nflog_tg_reg __read_mostly = {
60 .name = "NFLOG",
61 .revision = 0,
62 .family = NFPROTO_UNSPEC,
63 .checkentry = nflog_tg_check,
64 .destroy = nflog_tg_destroy,
65 .target = nflog_tg,
66 .targetsize = sizeof(struct xt_nflog_info),
67 .me = THIS_MODULE,
68 };
69
nflog_tg_init(void)70 static int __init nflog_tg_init(void)
71 {
72 return xt_register_target(&nflog_tg_reg);
73 }
74
nflog_tg_exit(void)75 static void __exit nflog_tg_exit(void)
76 {
77 xt_unregister_target(&nflog_tg_reg);
78 }
79
80 module_init(nflog_tg_init);
81 module_exit(nflog_tg_exit);
82