ip6table_raw.c

  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");
109MODULE_DESCRIPTION("Ip6tables legacy raw table");