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