1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * "security" table |
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_ipv4/ip_tables.h> |
17 | #include <linux/slab.h> |
18 | #include <net/ip.h> |
19 | |
20 | MODULE_LICENSE("GPL" ); |
21 | MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>" ); |
22 | MODULE_DESCRIPTION("iptables security table, for MAC rules" ); |
23 | |
24 | #define SECURITY_VALID_HOOKS (1 << NF_INET_LOCAL_IN) | \ |
25 | (1 << NF_INET_FORWARD) | \ |
26 | (1 << NF_INET_LOCAL_OUT) |
27 | |
28 | static const struct xt_table security_table = { |
29 | .name = "security" , |
30 | .valid_hooks = SECURITY_VALID_HOOKS, |
31 | .me = THIS_MODULE, |
32 | .af = NFPROTO_IPV4, |
33 | .priority = NF_IP_PRI_SECURITY, |
34 | }; |
35 | |
36 | static struct nf_hook_ops *sectbl_ops __read_mostly; |
37 | |
38 | static int iptable_security_table_init(struct net *net) |
39 | { |
40 | struct ipt_replace *repl; |
41 | int ret; |
42 | |
43 | repl = ipt_alloc_initial_table(&security_table); |
44 | if (repl == NULL) |
45 | return -ENOMEM; |
46 | ret = ipt_register_table(net, table: &security_table, repl, ops: sectbl_ops); |
47 | kfree(objp: repl); |
48 | return ret; |
49 | } |
50 | |
51 | static void __net_exit iptable_security_net_pre_exit(struct net *net) |
52 | { |
53 | ipt_unregister_table_pre_exit(net, name: "security" ); |
54 | } |
55 | |
56 | static void __net_exit iptable_security_net_exit(struct net *net) |
57 | { |
58 | ipt_unregister_table_exit(net, name: "security" ); |
59 | } |
60 | |
61 | static struct pernet_operations iptable_security_net_ops = { |
62 | .pre_exit = iptable_security_net_pre_exit, |
63 | .exit = iptable_security_net_exit, |
64 | }; |
65 | |
66 | static int __init iptable_security_init(void) |
67 | { |
68 | int ret = xt_register_template(t: &security_table, |
69 | table_init: iptable_security_table_init); |
70 | |
71 | if (ret < 0) |
72 | return ret; |
73 | |
74 | sectbl_ops = xt_hook_ops_alloc(&security_table, ipt_do_table); |
75 | if (IS_ERR(ptr: sectbl_ops)) { |
76 | xt_unregister_template(t: &security_table); |
77 | return PTR_ERR(ptr: sectbl_ops); |
78 | } |
79 | |
80 | ret = register_pernet_subsys(&iptable_security_net_ops); |
81 | if (ret < 0) { |
82 | xt_unregister_template(t: &security_table); |
83 | kfree(objp: sectbl_ops); |
84 | return ret; |
85 | } |
86 | |
87 | return ret; |
88 | } |
89 | |
90 | static void __exit iptable_security_fini(void) |
91 | { |
92 | unregister_pernet_subsys(&iptable_security_net_ops); |
93 | kfree(objp: sectbl_ops); |
94 | xt_unregister_template(t: &security_table); |
95 | } |
96 | |
97 | module_init(iptable_security_init); |
98 | module_exit(iptable_security_fini); |
99 | |