1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * "security" table for IPv6 |
4 | * |
5 | * This is for use by Mandatory Access Control (MAC) security models, |
6 | * which need to be able to manage security policy in separate context |
7 | * to DAC. |
8 | * |
9 | * Based on iptable_mangle.c |
10 | * |
11 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling |
12 | * Copyright (C) 2000-2004 Netfilter Core Team <coreteam <at> netfilter.org> |
13 | * Copyright (C) 2008 Red Hat, Inc., James Morris <jmorris <at> redhat.com> |
14 | */ |
15 | #include <linux/module.h> |
16 | #include <linux/netfilter_ipv6/ip6_tables.h> |
17 | #include <linux/slab.h> |
18 | |
19 | MODULE_LICENSE("GPL" ); |
20 | MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>" ); |
21 | MODULE_DESCRIPTION("ip6tables security table, for MAC rules" ); |
22 | |
23 | #define SECURITY_VALID_HOOKS (1 << NF_INET_LOCAL_IN) | \ |
24 | (1 << NF_INET_FORWARD) | \ |
25 | (1 << NF_INET_LOCAL_OUT) |
26 | |
27 | static const struct xt_table security_table = { |
28 | .name = "security" , |
29 | .valid_hooks = SECURITY_VALID_HOOKS, |
30 | .me = THIS_MODULE, |
31 | .af = NFPROTO_IPV6, |
32 | .priority = NF_IP6_PRI_SECURITY, |
33 | }; |
34 | |
35 | static struct nf_hook_ops *sectbl_ops __read_mostly; |
36 | |
37 | static int ip6table_security_table_init(struct net *net) |
38 | { |
39 | struct ip6t_replace *repl; |
40 | int ret; |
41 | |
42 | repl = ip6t_alloc_initial_table(&security_table); |
43 | if (repl == NULL) |
44 | return -ENOMEM; |
45 | ret = ip6t_register_table(net, table: &security_table, repl, ops: sectbl_ops); |
46 | kfree(objp: repl); |
47 | return ret; |
48 | } |
49 | |
50 | static void __net_exit ip6table_security_net_pre_exit(struct net *net) |
51 | { |
52 | ip6t_unregister_table_pre_exit(net, name: "security" ); |
53 | } |
54 | |
55 | static void __net_exit ip6table_security_net_exit(struct net *net) |
56 | { |
57 | ip6t_unregister_table_exit(net, name: "security" ); |
58 | } |
59 | |
60 | static struct pernet_operations ip6table_security_net_ops = { |
61 | .pre_exit = ip6table_security_net_pre_exit, |
62 | .exit = ip6table_security_net_exit, |
63 | }; |
64 | |
65 | static int __init ip6table_security_init(void) |
66 | { |
67 | int ret = xt_register_template(t: &security_table, |
68 | table_init: ip6table_security_table_init); |
69 | |
70 | if (ret < 0) |
71 | return ret; |
72 | |
73 | sectbl_ops = xt_hook_ops_alloc(&security_table, ip6t_do_table); |
74 | if (IS_ERR(ptr: sectbl_ops)) { |
75 | xt_unregister_template(t: &security_table); |
76 | return PTR_ERR(ptr: sectbl_ops); |
77 | } |
78 | |
79 | ret = register_pernet_subsys(&ip6table_security_net_ops); |
80 | if (ret < 0) { |
81 | kfree(objp: sectbl_ops); |
82 | xt_unregister_template(t: &security_table); |
83 | return ret; |
84 | } |
85 | |
86 | return ret; |
87 | } |
88 | |
89 | static void __exit ip6table_security_fini(void) |
90 | { |
91 | unregister_pernet_subsys(&ip6table_security_net_ops); |
92 | xt_unregister_template(t: &security_table); |
93 | kfree(objp: sectbl_ops); |
94 | } |
95 | |
96 | module_init(ip6table_security_init); |
97 | module_exit(ip6table_security_fini); |
98 | |