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_filter.c (2708B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * This is the 1999 rewrite of IP Firewalling, aiming for kernel 2.3.x.
      4 *
      5 * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
      6 * Copyright (C) 2000-2004 Netfilter Core Team <coreteam@netfilter.org>
      7 */
      8
      9#include <linux/module.h>
     10#include <linux/moduleparam.h>
     11#include <linux/netfilter_ipv6/ip6_tables.h>
     12#include <linux/slab.h>
     13
     14MODULE_LICENSE("GPL");
     15MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
     16MODULE_DESCRIPTION("ip6tables filter table");
     17
     18#define FILTER_VALID_HOOKS ((1 << NF_INET_LOCAL_IN) | \
     19			    (1 << NF_INET_FORWARD) | \
     20			    (1 << NF_INET_LOCAL_OUT))
     21
     22static const struct xt_table packet_filter = {
     23	.name		= "filter",
     24	.valid_hooks	= FILTER_VALID_HOOKS,
     25	.me		= THIS_MODULE,
     26	.af		= NFPROTO_IPV6,
     27	.priority	= NF_IP6_PRI_FILTER,
     28};
     29
     30static struct nf_hook_ops *filter_ops __read_mostly;
     31
     32/* Default to forward because I got too much mail already. */
     33static bool forward = true;
     34module_param(forward, bool, 0000);
     35
     36static int ip6table_filter_table_init(struct net *net)
     37{
     38	struct ip6t_replace *repl;
     39	int err;
     40
     41	repl = ip6t_alloc_initial_table(&packet_filter);
     42	if (repl == NULL)
     43		return -ENOMEM;
     44	/* Entry 1 is the FORWARD hook */
     45	((struct ip6t_standard *)repl->entries)[1].target.verdict =
     46		forward ? -NF_ACCEPT - 1 : -NF_DROP - 1;
     47
     48	err = ip6t_register_table(net, &packet_filter, repl, filter_ops);
     49	kfree(repl);
     50	return err;
     51}
     52
     53static int __net_init ip6table_filter_net_init(struct net *net)
     54{
     55	if (!forward)
     56		return ip6table_filter_table_init(net);
     57
     58	return 0;
     59}
     60
     61static void __net_exit ip6table_filter_net_pre_exit(struct net *net)
     62{
     63	ip6t_unregister_table_pre_exit(net, "filter");
     64}
     65
     66static void __net_exit ip6table_filter_net_exit(struct net *net)
     67{
     68	ip6t_unregister_table_exit(net, "filter");
     69}
     70
     71static struct pernet_operations ip6table_filter_net_ops = {
     72	.init = ip6table_filter_net_init,
     73	.pre_exit = ip6table_filter_net_pre_exit,
     74	.exit = ip6table_filter_net_exit,
     75};
     76
     77static int __init ip6table_filter_init(void)
     78{
     79	int ret = xt_register_template(&packet_filter,
     80					ip6table_filter_table_init);
     81
     82	if (ret < 0)
     83		return ret;
     84
     85	filter_ops = xt_hook_ops_alloc(&packet_filter, ip6t_do_table);
     86	if (IS_ERR(filter_ops)) {
     87		xt_unregister_template(&packet_filter);
     88		return PTR_ERR(filter_ops);
     89	}
     90
     91	ret = register_pernet_subsys(&ip6table_filter_net_ops);
     92	if (ret < 0) {
     93		xt_unregister_template(&packet_filter);
     94		kfree(filter_ops);
     95		return ret;
     96	}
     97
     98	return ret;
     99}
    100
    101static void __exit ip6table_filter_fini(void)
    102{
    103	unregister_pernet_subsys(&ip6table_filter_net_ops);
    104	xt_unregister_template(&packet_filter);
    105	kfree(filter_ops);
    106}
    107
    108module_init(ip6table_filter_init);
    109module_exit(ip6table_filter_fini);