1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * ebt_nflog |
4 | * |
5 | * Author: |
6 | * Peter Warasin <peter@endian.com> |
7 | * |
8 | * February, 2008 |
9 | * |
10 | * Based on: |
11 | * xt_NFLOG.c, (C) 2006 by Patrick McHardy <kaber@trash.net> |
12 | * ebt_ulog.c, (C) 2004 by Bart De Schuymer <bdschuym@pandora.be> |
13 | * |
14 | */ |
15 | |
16 | #include <linux/module.h> |
17 | #include <linux/spinlock.h> |
18 | #include <linux/netfilter/x_tables.h> |
19 | #include <linux/netfilter_bridge/ebtables.h> |
20 | #include <linux/netfilter_bridge/ebt_nflog.h> |
21 | #include <net/netfilter/nf_log.h> |
22 | |
23 | static unsigned int |
24 | ebt_nflog_tg(struct sk_buff *skb, const struct xt_action_param *par) |
25 | { |
26 | const struct ebt_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 | nf_log_packet(net, PF_BRIDGE, hooknum: xt_hooknum(par), skb, in: xt_in(par), |
37 | out: xt_out(par), li: &li, fmt: "%s" , info->prefix); |
38 | return EBT_CONTINUE; |
39 | } |
40 | |
41 | static int ebt_nflog_tg_check(const struct xt_tgchk_param *par) |
42 | { |
43 | struct ebt_nflog_info *info = par->targinfo; |
44 | |
45 | if (info->flags & ~EBT_NFLOG_MASK) |
46 | return -EINVAL; |
47 | info->prefix[EBT_NFLOG_PREFIX_SIZE - 1] = '\0'; |
48 | return 0; |
49 | } |
50 | |
51 | static struct xt_target ebt_nflog_tg_reg __read_mostly = { |
52 | .name = "nflog" , |
53 | .revision = 0, |
54 | .family = NFPROTO_BRIDGE, |
55 | .target = ebt_nflog_tg, |
56 | .checkentry = ebt_nflog_tg_check, |
57 | .targetsize = sizeof(struct ebt_nflog_info), |
58 | .me = THIS_MODULE, |
59 | }; |
60 | |
61 | static int __init ebt_nflog_init(void) |
62 | { |
63 | return xt_register_target(target: &ebt_nflog_tg_reg); |
64 | } |
65 | |
66 | static void __exit ebt_nflog_fini(void) |
67 | { |
68 | xt_unregister_target(target: &ebt_nflog_tg_reg); |
69 | } |
70 | |
71 | module_init(ebt_nflog_init); |
72 | module_exit(ebt_nflog_fini); |
73 | MODULE_LICENSE("GPL" ); |
74 | MODULE_AUTHOR("Peter Warasin <peter@endian.com>" ); |
75 | MODULE_DESCRIPTION("ebtables NFLOG netfilter logging module" ); |
76 | |