// SPDX-License-Identifier: GPL-2.0-only/* *	xt_mark - Netfilter module to match NFMARK value * *	(C) 1999-2001 Marc Boucher <marc@mbsi.ca> *	Copyright © CC Computer Consultants GmbH, 2007 - 2008 *	Jan Engelhardt <jengelh@medozas.de> */ #include <linux/module.h>#include <linux/skbuff.h> #include <linux/netfilter/xt_mark.h>#include <linux/netfilter/x_tables.h> MODULE_LICENSE("GPL");MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");MODULE_DESCRIPTION("Xtables: packet mark operations");MODULE_ALIAS("ipt_mark");MODULE_ALIAS("ip6t_mark");MODULE_ALIAS("ipt_MARK");MODULE_ALIAS("ip6t_MARK");MODULE_ALIAS("arpt_MARK"); static unsigned intmark_tg(struct sk_buff *skb, const struct xt_action_param *par){	const struct xt_mark_tginfo2 *info = par->targinfo; 	skb->mark = (skb->mark & ~info->mask) ^ info->mark;	return XT_CONTINUE;} static boolmark_mt(const struct sk_buff *skb, struct xt_action_param *par){	const struct xt_mark_mtinfo1 *info = par->matchinfo; 	return ((skb->mark & info->mask) == info->mark) ^ info->invert;} static struct xt_target mark_tg_reg[] __read_mostly = {	{		.name           = "MARK",		.revision       = 2,		.family         = NFPROTO_IPV4,		.target         = mark_tg,		.targetsize     = sizeof(struct xt_mark_tginfo2),		.me             = THIS_MODULE,	},#if IS_ENABLED(CONFIG_IP_NF_ARPTABLES) || IS_ENABLED(CONFIG_NFT_COMPAT_ARP)	{		.name           = "MARK",		.revision       = 2,		.family         = NFPROTO_ARP,		.target         = mark_tg,		.targetsize     = sizeof(struct xt_mark_tginfo2),		.me             = THIS_MODULE,	},#endif#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)	{		.name           = "MARK",		.revision       = 2,		.family         = NFPROTO_IPV6,		.target         = mark_tg,		.targetsize     = sizeof(struct xt_mark_tginfo2),		.me             = THIS_MODULE,	},#endif}; static struct xt_match mark_mt_reg __read_mostly = {	.name           = "mark",	.revision       = 1,	.family         = NFPROTO_UNSPEC,	.match          = mark_mt,	.matchsize      = sizeof(struct xt_mark_mtinfo1),	.me             = THIS_MODULE,}; static int __init mark_mt_init(void){	int ret; 	ret = xt_register_targets(mark_tg_reg, ARRAY_SIZE(mark_tg_reg));	if (ret < 0)		return ret;	ret = xt_register_match(&mark_mt_reg);	if (ret < 0) {		xt_unregister_targets(mark_tg_reg, ARRAY_SIZE(mark_tg_reg));		return ret;	}	return 0;} static void __exit mark_mt_exit(void){	xt_unregister_match(&mark_mt_reg);	xt_unregister_targets(mark_tg_reg, ARRAY_SIZE(mark_tg_reg));} module_init(mark_mt_init);module_exit(mark_mt_exit);