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 | |
| 13 | #include <linux/netfilter_ipv4/ipt_mark.h> |
| 14 | #include <linux/netfilter_ipv4/ip_tables.h> |
| 15 | |
| 16 | MODULE_LICENSE("GPL"); |
| 17 | MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); |
| 18 | MODULE_DESCRIPTION("iptables mark matching module"); |
| 19 | |
| 20 | static int |
| 21 | match(const struct sk_buff *skb, |
| 22 | const struct net_device *in, |
| 23 | const struct net_device *out, |
| 24 | const void *matchinfo, |
| 25 | int offset, |
| 26 | int *hotdrop) |
| 27 | { |
| 28 | const struct ipt_mark_info *info = matchinfo; |
| 29 | |
| 30 | return ((skb->nfmark & info->mask) == info->mark) ^ info->invert; |
| 31 | } |
| 32 | |
| 33 | static int |
| 34 | checkentry(const char *tablename, |
| 35 | const struct ipt_ip *ip, |
| 36 | void *matchinfo, |
| 37 | unsigned int matchsize, |
| 38 | unsigned int hook_mask) |
| 39 | { |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame^] | 40 | struct ipt_mark_info *minfo = (struct ipt_mark_info *) matchinfo; |
| 41 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | if (matchsize != IPT_ALIGN(sizeof(struct ipt_mark_info))) |
| 43 | return 0; |
| 44 | |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame^] | 45 | if (minfo->mark > 0xffffffff || minfo->mask > 0xffffffff) { |
| 46 | printk(KERN_WARNING "mark: only supports 32bit mark\n"); |
| 47 | return 0; |
| 48 | } |
| 49 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | return 1; |
| 51 | } |
| 52 | |
| 53 | static struct ipt_match mark_match = { |
| 54 | .name = "mark", |
| 55 | .match = &match, |
| 56 | .checkentry = &checkentry, |
| 57 | .me = THIS_MODULE, |
| 58 | }; |
| 59 | |
| 60 | static int __init init(void) |
| 61 | { |
| 62 | return ipt_register_match(&mark_match); |
| 63 | } |
| 64 | |
| 65 | static void __exit fini(void) |
| 66 | { |
| 67 | ipt_unregister_match(&mark_match); |
| 68 | } |
| 69 | |
| 70 | module_init(init); |
| 71 | module_exit(fini); |