cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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xt_mark.c (1970B)

      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);