projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 | { | |
| 40 | if (matchsize != IPT_ALIGN(sizeof(struct ipt_mark_info))) | |
| 41 | return 0; | |
| 42 | ||
| 43 | return 1; | |
| 44 | } | |
| 45 | ||
| 46 | static struct ipt_match mark_match = { | |
| 47 | .name = "mark", | |
| 48 | .match = &match, | |
| 49 | .checkentry = &checkentry, | |
| 50 | .me = THIS_MODULE, | |
| 51 | }; | |
| 52 | ||
| 53 | static int __init init(void) | |
| 54 | { | |
| 55 | return ipt_register_match(&mark_match); | |
| 56 | } | |
| 57 | ||
| 58 | static void __exit fini(void) | |
| 59 | { | |
| 60 | ipt_unregister_match(&mark_match); | |
| 61 | } | |
| 62 | ||
| 63 | module_init(init); | |
| 64 | module_exit(fini); |