Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* Kernel module to match NFMARK values. */ |
| 2 | |
| 3 | /* (C) 1999-2001 Marc Boucher <marc@mbsi.ca> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/skbuff.h> |
| 12 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 13 | #include <linux/netfilter/xt_mark.h> |
| 14 | #include <linux/netfilter/x_tables.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | |
| 16 | MODULE_LICENSE("GPL"); |
| 17 | MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); |
| 18 | MODULE_DESCRIPTION("iptables mark matching module"); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 19 | MODULE_ALIAS("ipt_mark"); |
| 20 | MODULE_ALIAS("ip6t_mark"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
| 22 | static int |
| 23 | match(const struct sk_buff *skb, |
| 24 | const struct net_device *in, |
| 25 | const struct net_device *out, |
Patrick McHardy | c498673 | 2006-03-20 18:02:56 -0800 | [diff] [blame^] | 26 | const struct xt_match *match, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | const void *matchinfo, |
| 28 | int offset, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 29 | unsigned int protoff, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | int *hotdrop) |
| 31 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 32 | const struct xt_mark_info *info = matchinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | return ((skb->nfmark & info->mask) == info->mark) ^ info->invert; |
| 35 | } |
| 36 | |
| 37 | static int |
| 38 | checkentry(const char *tablename, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 39 | const void *entry, |
Patrick McHardy | c498673 | 2006-03-20 18:02:56 -0800 | [diff] [blame^] | 40 | const struct xt_match *match, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | void *matchinfo, |
| 42 | unsigned int matchsize, |
| 43 | unsigned int hook_mask) |
| 44 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 45 | struct xt_mark_info *minfo = (struct xt_mark_info *) matchinfo; |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 46 | |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 47 | if (minfo->mark > 0xffffffff || minfo->mask > 0xffffffff) { |
| 48 | printk(KERN_WARNING "mark: only supports 32bit mark\n"); |
| 49 | return 0; |
| 50 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | return 1; |
| 52 | } |
| 53 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 54 | static struct xt_match mark_match = { |
| 55 | .name = "mark", |
Patrick McHardy | 5d04bff | 2006-03-20 18:01:58 -0800 | [diff] [blame] | 56 | .match = match, |
| 57 | .matchsize = sizeof(struct xt_mark_info), |
| 58 | .checkentry = checkentry, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 59 | .me = THIS_MODULE, |
| 60 | }; |
| 61 | |
| 62 | static struct xt_match mark6_match = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | .name = "mark", |
Patrick McHardy | 5d04bff | 2006-03-20 18:01:58 -0800 | [diff] [blame] | 64 | .match = match, |
| 65 | .matchsize = sizeof(struct xt_mark_info), |
| 66 | .checkentry = checkentry, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | .me = THIS_MODULE, |
| 68 | }; |
| 69 | |
| 70 | static int __init init(void) |
| 71 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 72 | int ret; |
| 73 | ret = xt_register_match(AF_INET, &mark_match); |
| 74 | if (ret) |
| 75 | return ret; |
| 76 | |
| 77 | ret = xt_register_match(AF_INET6, &mark6_match); |
| 78 | if (ret) |
| 79 | xt_unregister_match(AF_INET, &mark_match); |
| 80 | |
| 81 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | } |
| 83 | |
| 84 | static void __exit fini(void) |
| 85 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 86 | xt_unregister_match(AF_INET, &mark_match); |
| 87 | xt_unregister_match(AF_INET6, &mark6_match); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | module_init(init); |
| 91 | module_exit(fini); |