net/netfilter/xt_mark.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *      xt_mark - Netfilter module to match NFMARK value
   4  *
   5  *      (C) 1999-2001 Marc Boucher <marc@mbsi.ca>
   6  *      Copyright © CC Computer Consultants GmbH, 2007 - 2008
   7  *      Jan Engelhardt <jengelh@medozas.de>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/skbuff.h>
  12
  13 #include <linux/netfilter/xt_mark.h>
  14 #include <linux/netfilter/x_tables.h>
  15
  16 MODULE_LICENSE("GPL");
  17 MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
  18 MODULE_DESCRIPTION("Xtables: packet mark operations");
  19 MODULE_ALIAS("ipt_mark");
  20 MODULE_ALIAS("ip6t_mark");
  21 MODULE_ALIAS("ipt_MARK");
  22 MODULE_ALIAS("ip6t_MARK");
  23 MODULE_ALIAS("arpt_MARK");
  24
  25 static unsigned int
  26 mark_tg(struct sk_buff *skb, const struct xt_action_param *par)
  27 {
  28         const struct xt_mark_tginfo2 *info = par->targinfo;
  29
  30         skb->mark = (skb->mark & ~info->mask) ^ info->mark;
  31         return XT_CONTINUE;
  32 }
  33
  34 static bool
  35 mark_mt(const struct sk_buff *skb, struct xt_action_param *par)
  36 {
  37         const struct xt_mark_mtinfo1 *info = par->matchinfo;
  38
  39         return ((skb->mark & info->mask) == info->mark) ^ info->invert;
  40 }
  41
  42 static struct xt_target mark_tg_reg __read_mostly = {
  43         .name           = "MARK",
  44         .revision       = 2,
  45         .family         = NFPROTO_UNSPEC,
  46         .target         = mark_tg,
  47         .targetsize     = sizeof(struct xt_mark_tginfo2),
  48         .me             = THIS_MODULE,
  49 };
  50
  51 static struct xt_match mark_mt_reg __read_mostly = {
  52         .name           = "mark",
  53         .revision       = 1,
  54         .family         = NFPROTO_UNSPEC,
  55         .match          = mark_mt,
  56         .matchsize      = sizeof(struct xt_mark_mtinfo1),
  57         .me             = THIS_MODULE,
  58 };
  59
  60 static int __init mark_mt_init(void)
  61 {
  62         int ret;
  63
  64         ret = xt_register_target(&mark_tg_reg);
  65         if (ret < 0)
  66                 return ret;
  67         ret = xt_register_match(&mark_mt_reg);
  68         if (ret < 0) {
  69                 xt_unregister_target(&mark_tg_reg);
  70                 return ret;
  71         }
  72         return 0;
  73 }
  74
  75 static void __exit mark_mt_exit(void)
  76 {
  77         xt_unregister_match(&mark_mt_reg);
  78         xt_unregister_target(&mark_tg_reg);
  79 }
  80
  81 module_init(mark_mt_init);
  82 module_exit(mark_mt_exit);