net/ipv6/netfilter/ip6t_mark.c

   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
  11 #include <linux/module.h>
  12 #include <linux/skbuff.h>
  13
  14 #include <linux/netfilter_ipv6/ip6t_mark.h>
  15 #include <linux/netfilter_ipv6/ip6_tables.h>
  16
  17 MODULE_LICENSE("GPL");
  18 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
  19 MODULE_DESCRIPTION("ip6tables mark match");
  20
  21 static int
  22 match(const struct sk_buff *skb,
  23       const struct net_device *in,
  24       const struct net_device *out,
  25       const void *matchinfo,
  26       int offset,
  27       unsigned int protoff,
  28       int *hotdrop)
  29 {
  30         const struct ip6t_mark_info *info = matchinfo;
  31
  32         return ((skb->nfmark & info->mask) == info->mark) ^ info->invert;
  33 }
  34
  35 static int
  36 checkentry(const char *tablename,
  37            const struct ip6t_ip6 *ip,
  38            void *matchinfo,
  39            unsigned int matchsize,
  40            unsigned int hook_mask)
  41 {
  42         if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_mark_info)))
  43                 return 0;
  44
  45         return 1;
  46 }
  47
  48 static struct ip6t_match mark_match = {
  49         .name           = "mark",
  50         .match          = &match,
  51         .checkentry     = &checkentry,
  52         .me             = THIS_MODULE,
  53 };
  54
  55 static int __init init(void)
  56 {
  57         return ip6t_register_match(&mark_match);
  58 }
  59
  60 static void __exit fini(void)
  61 {
  62         ip6t_unregister_match(&mark_match);
  63 }
  64
  65 module_init(init);
  66 module_exit(fini);