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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ip6table_security.c (2517B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * "security" table for IPv6
      4 *
      5 * This is for use by Mandatory Access Control (MAC) security models,
      6 * which need to be able to manage security policy in separate context
      7 * to DAC.
      8 *
      9 * Based on iptable_mangle.c
     10 *
     11 * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
     12 * Copyright (C) 2000-2004 Netfilter Core Team <coreteam <at> netfilter.org>
     13 * Copyright (C) 2008 Red Hat, Inc., James Morris <jmorris <at> redhat.com>
     14 */
     15#include <linux/module.h>
     16#include <linux/netfilter_ipv6/ip6_tables.h>
     17#include <linux/slab.h>
     18
     19MODULE_LICENSE("GPL");
     20MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>");
     21MODULE_DESCRIPTION("ip6tables security table, for MAC rules");
     22
     23#define SECURITY_VALID_HOOKS	(1 << NF_INET_LOCAL_IN) | \
     24				(1 << NF_INET_FORWARD) | \
     25				(1 << NF_INET_LOCAL_OUT)
     26
     27static const struct xt_table security_table = {
     28	.name		= "security",
     29	.valid_hooks	= SECURITY_VALID_HOOKS,
     30	.me		= THIS_MODULE,
     31	.af		= NFPROTO_IPV6,
     32	.priority	= NF_IP6_PRI_SECURITY,
     33};
     34
     35static struct nf_hook_ops *sectbl_ops __read_mostly;
     36
     37static int ip6table_security_table_init(struct net *net)
     38{
     39	struct ip6t_replace *repl;
     40	int ret;
     41
     42	repl = ip6t_alloc_initial_table(&security_table);
     43	if (repl == NULL)
     44		return -ENOMEM;
     45	ret = ip6t_register_table(net, &security_table, repl, sectbl_ops);
     46	kfree(repl);
     47	return ret;
     48}
     49
     50static void __net_exit ip6table_security_net_pre_exit(struct net *net)
     51{
     52	ip6t_unregister_table_pre_exit(net, "security");
     53}
     54
     55static void __net_exit ip6table_security_net_exit(struct net *net)
     56{
     57	ip6t_unregister_table_exit(net, "security");
     58}
     59
     60static struct pernet_operations ip6table_security_net_ops = {
     61	.pre_exit = ip6table_security_net_pre_exit,
     62	.exit = ip6table_security_net_exit,
     63};
     64
     65static int __init ip6table_security_init(void)
     66{
     67	int ret = xt_register_template(&security_table,
     68				       ip6table_security_table_init);
     69
     70	if (ret < 0)
     71		return ret;
     72
     73	sectbl_ops = xt_hook_ops_alloc(&security_table, ip6t_do_table);
     74	if (IS_ERR(sectbl_ops)) {
     75		xt_unregister_template(&security_table);
     76		return PTR_ERR(sectbl_ops);
     77	}
     78
     79	ret = register_pernet_subsys(&ip6table_security_net_ops);
     80	if (ret < 0) {
     81		kfree(sectbl_ops);
     82		xt_unregister_template(&security_table);
     83		return ret;
     84	}
     85
     86	return ret;
     87}
     88
     89static void __exit ip6table_security_fini(void)
     90{
     91	unregister_pernet_subsys(&ip6table_security_net_ops);
     92	xt_unregister_template(&security_table);
     93	kfree(sectbl_ops);
     94}
     95
     96module_init(ip6table_security_init);
     97module_exit(ip6table_security_fini);