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Linux/net/netfilter/xt_mark.c

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  1 /*
  2  *      xt_mark - Netfilter module to match NFMARK value
  3  *
  4  *      (C) 1999-2001 Marc Boucher <marc@mbsi.ca>
  5  *      Copyright © CC Computer Consultants GmbH, 2007 - 2008
  6  *      Jan Engelhardt <jengelh@medozas.de>
  7  *
  8  *      This program is free software; you can redistribute it and/or modify
  9  *      it under the terms of the GNU General Public License version 2 as
 10  *      published by the Free Software Foundation.
 11  */
 12 
 13 #include <linux/module.h>
 14 #include <linux/skbuff.h>
 15 
 16 #include <linux/netfilter/xt_mark.h>
 17 #include <linux/netfilter/x_tables.h>
 18 
 19 MODULE_LICENSE("GPL");
 20 MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
 21 MODULE_DESCRIPTION("Xtables: packet mark operations");
 22 MODULE_ALIAS("ipt_mark");
 23 MODULE_ALIAS("ip6t_mark");
 24 MODULE_ALIAS("ipt_MARK");
 25 MODULE_ALIAS("ip6t_MARK");
 26 
 27 static unsigned int
 28 mark_tg(struct sk_buff *skb, const struct xt_action_param *par)
 29 {
 30         const struct xt_mark_tginfo2 *info = par->targinfo;
 31 
 32         skb->mark = (skb->mark & ~info->mask) ^ info->mark;
 33         return XT_CONTINUE;
 34 }
 35 
 36 static bool
 37 mark_mt(const struct sk_buff *skb, struct xt_action_param *par)
 38 {
 39         const struct xt_mark_mtinfo1 *info = par->matchinfo;
 40 
 41         return ((skb->mark & info->mask) == info->mark) ^ info->invert;
 42 }
 43 
 44 static struct xt_target mark_tg_reg __read_mostly = {
 45         .name           = "MARK",
 46         .revision       = 2,
 47         .family         = NFPROTO_UNSPEC,
 48         .target         = mark_tg,
 49         .targetsize     = sizeof(struct xt_mark_tginfo2),
 50         .me             = THIS_MODULE,
 51 };
 52 
 53 static struct xt_match mark_mt_reg __read_mostly = {
 54         .name           = "mark",
 55         .revision       = 1,
 56         .family         = NFPROTO_UNSPEC,
 57         .match          = mark_mt,
 58         .matchsize      = sizeof(struct xt_mark_mtinfo1),
 59         .me             = THIS_MODULE,
 60 };
 61 
 62 static int __init mark_mt_init(void)
 63 {
 64         int ret;
 65 
 66         ret = xt_register_target(&mark_tg_reg);
 67         if (ret < 0)
 68                 return ret;
 69         ret = xt_register_match(&mark_mt_reg);
 70         if (ret < 0) {
 71                 xt_unregister_target(&mark_tg_reg);
 72                 return ret;
 73         }
 74         return 0;
 75 }
 76 
 77 static void __exit mark_mt_exit(void)
 78 {
 79         xt_unregister_match(&mark_mt_reg);
 80         xt_unregister_target(&mark_tg_reg);
 81 }
 82 
 83 module_init(mark_mt_init);
 84 module_exit(mark_mt_exit);
 85 

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