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_raw.c (2583B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * IPv6 raw table, a port of the IPv4 raw table to IPv6
      4 *
      5 * Copyright (C) 2003 Jozsef Kadlecsik <kadlec@netfilter.org>
      6 */
      7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
      8#include <linux/module.h>
      9#include <linux/netfilter_ipv6/ip6_tables.h>
     10#include <linux/slab.h>
     11
     12#define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT))
     13
     14static bool raw_before_defrag __read_mostly;
     15MODULE_PARM_DESC(raw_before_defrag, "Enable raw table before defrag");
     16module_param(raw_before_defrag, bool, 0000);
     17
     18static const struct xt_table packet_raw = {
     19	.name = "raw",
     20	.valid_hooks = RAW_VALID_HOOKS,
     21	.me = THIS_MODULE,
     22	.af = NFPROTO_IPV6,
     23	.priority = NF_IP6_PRI_RAW,
     24};
     25
     26static const struct xt_table packet_raw_before_defrag = {
     27	.name = "raw",
     28	.valid_hooks = RAW_VALID_HOOKS,
     29	.me = THIS_MODULE,
     30	.af = NFPROTO_IPV6,
     31	.priority = NF_IP6_PRI_RAW_BEFORE_DEFRAG,
     32};
     33
     34static struct nf_hook_ops *rawtable_ops __read_mostly;
     35
     36static int ip6table_raw_table_init(struct net *net)
     37{
     38	struct ip6t_replace *repl;
     39	const struct xt_table *table = &packet_raw;
     40	int ret;
     41
     42	if (raw_before_defrag)
     43		table = &packet_raw_before_defrag;
     44
     45	repl = ip6t_alloc_initial_table(table);
     46	if (repl == NULL)
     47		return -ENOMEM;
     48	ret = ip6t_register_table(net, table, repl, rawtable_ops);
     49	kfree(repl);
     50	return ret;
     51}
     52
     53static void __net_exit ip6table_raw_net_pre_exit(struct net *net)
     54{
     55	ip6t_unregister_table_pre_exit(net, "raw");
     56}
     57
     58static void __net_exit ip6table_raw_net_exit(struct net *net)
     59{
     60	ip6t_unregister_table_exit(net, "raw");
     61}
     62
     63static struct pernet_operations ip6table_raw_net_ops = {
     64	.pre_exit = ip6table_raw_net_pre_exit,
     65	.exit = ip6table_raw_net_exit,
     66};
     67
     68static int __init ip6table_raw_init(void)
     69{
     70	const struct xt_table *table = &packet_raw;
     71	int ret;
     72
     73	if (raw_before_defrag) {
     74		table = &packet_raw_before_defrag;
     75		pr_info("Enabling raw table before defrag\n");
     76	}
     77
     78	ret = xt_register_template(table, ip6table_raw_table_init);
     79	if (ret < 0)
     80		return ret;
     81
     82	/* Register hooks */
     83	rawtable_ops = xt_hook_ops_alloc(table, ip6t_do_table);
     84	if (IS_ERR(rawtable_ops)) {
     85		xt_unregister_template(table);
     86		return PTR_ERR(rawtable_ops);
     87	}
     88
     89	ret = register_pernet_subsys(&ip6table_raw_net_ops);
     90	if (ret < 0) {
     91		kfree(rawtable_ops);
     92		xt_unregister_template(table);
     93		return ret;
     94	}
     95
     96	return ret;
     97}
     98
     99static void __exit ip6table_raw_fini(void)
    100{
    101	unregister_pernet_subsys(&ip6table_raw_net_ops);
    102	xt_unregister_template(&packet_raw);
    103	kfree(rawtable_ops);
    104}
    105
    106module_init(ip6table_raw_init);
    107module_exit(ip6table_raw_fini);
    108MODULE_LICENSE("GPL");