Thomas Gleixner | 09c434b | 2019-05-19 13:08:20 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2 | /* |
| 3 | * Implements a dummy match to allow attaching comments to rules |
| 4 | * |
| 5 | * 2003-05-13 Brad Fisher (brad@info-link.net) |
| 6 | */ |
| 7 | |
| 8 | #include <linux/module.h> |
| 9 | #include <linux/skbuff.h> |
| 10 | #include <linux/netfilter/x_tables.h> |
| 11 | #include <linux/netfilter/xt_comment.h> |
| 12 | |
| 13 | MODULE_AUTHOR("Brad Fisher <brad@info-link.net>"); |
Jan Engelhardt | 2ae15b6 | 2008-01-14 23:42:28 -0800 | [diff] [blame] | 14 | MODULE_DESCRIPTION("Xtables: No-op match which can be tagged with a comment"); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 15 | MODULE_LICENSE("GPL"); |
| 16 | MODULE_ALIAS("ipt_comment"); |
| 17 | MODULE_ALIAS("ip6t_comment"); |
| 18 | |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 19 | static bool |
Jan Engelhardt | 62fc805 | 2009-07-07 20:42:08 +0200 | [diff] [blame] | 20 | comment_mt(const struct sk_buff *skb, struct xt_action_param *par) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 21 | { |
| 22 | /* We always match */ |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 23 | return true; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 24 | } |
| 25 | |
Jan Engelhardt | ab4f21e | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 26 | static struct xt_match comment_mt_reg __read_mostly = { |
| 27 | .name = "comment", |
| 28 | .revision = 0, |
| 29 | .family = NFPROTO_UNSPEC, |
| 30 | .match = comment_mt, |
| 31 | .matchsize = sizeof(struct xt_comment_info), |
| 32 | .me = THIS_MODULE, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 33 | }; |
| 34 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 35 | static int __init comment_mt_init(void) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 36 | { |
Jan Engelhardt | ab4f21e | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 37 | return xt_register_match(&comment_mt_reg); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 38 | } |
| 39 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 40 | static void __exit comment_mt_exit(void) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 41 | { |
Jan Engelhardt | ab4f21e | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 42 | xt_unregister_match(&comment_mt_reg); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 43 | } |
| 44 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 45 | module_init(comment_mt_init); |
| 46 | module_exit(comment_mt_exit); |