LXR linux/net/netfilter/xt

   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
  16MODULE_LICENSE("GPL");
  17MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
  18MODULE_DESCRIPTION("Xtables: packet mark operations");
  19MODULE_ALIAS("ipt_mark");
  20MODULE_ALIAS("ip6t_mark");
  21MODULE_ALIAS("ipt_MARK");
  22MODULE_ALIAS("ip6t_MARK");
  23MODULE_ALIAS("arpt_MARK");
  24
  25static unsigned int
  26mark_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
  34static bool
  35mark_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
  42static 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
  51static 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
  60static 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
  75static void __exit mark_mt_exit(void)
  76{
  77        xt_unregister_match(&mark_mt_reg);
  78        xt_unregister_target(&mark_tg_reg);
  79}
  80
  81module_init(mark_mt_init);
  82module_exit(mark_mt_exit);
  83