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  
14  static bool raw_before_defrag __read_mostly;
15  MODULE_PARM_DESC(raw_before_defrag, "Enable raw table before defrag");
16  module_param(raw_before_defrag, bool, 0000);
17  
18  static 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  
26  static 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  
34  static struct nf_hook_ops *rawtable_ops __read_mostly;
35  
ip6table_raw_table_init(struct net * net)36  static 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  
ip6table_raw_net_pre_exit(struct net * net)53  static void __net_exit ip6table_raw_net_pre_exit(struct net *net)
54  {
55  	ip6t_unregister_table_pre_exit(net, "raw");
56  }
57  
ip6table_raw_net_exit(struct net * net)58  static void __net_exit ip6table_raw_net_exit(struct net *net)
59  {
60  	ip6t_unregister_table_exit(net, "raw");
61  }
62  
63  static struct pernet_operations ip6table_raw_net_ops = {
64  	.pre_exit = ip6table_raw_net_pre_exit,
65  	.exit = ip6table_raw_net_exit,
66  };
67  
ip6table_raw_init(void)68  static 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  
ip6table_raw_fini(void)99  static 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  
106  module_init(ip6table_raw_init);
107  module_exit(ip6table_raw_fini);
108  MODULE_LICENSE("GPL");
109  MODULE_DESCRIPTION("Ip6tables legacy raw table");
110