Commit | Line | Data |
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560ee653 JM |
1 | /* |
2 | * "security" table | |
3 | * | |
4 | * This is for use by Mandatory Access Control (MAC) security models, | |
5 | * which need to be able to manage security policy in separate context | |
6 | * to DAC. | |
7 | * | |
8 | * Based on iptable_mangle.c | |
9 | * | |
10 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling | |
11 | * Copyright (C) 2000-2004 Netfilter Core Team <coreteam <at> netfilter.org> | |
12 | * Copyright (C) 2008 Red Hat, Inc., James Morris <jmorris <at> redhat.com> | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License version 2 as | |
16 | * published by the Free Software Foundation. | |
17 | */ | |
18 | #include <linux/module.h> | |
19 | #include <linux/netfilter_ipv4/ip_tables.h> | |
20 | #include <net/ip.h> | |
21 | ||
22 | MODULE_LICENSE("GPL"); | |
23 | MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>"); | |
24 | MODULE_DESCRIPTION("iptables security table, for MAC rules"); | |
25 | ||
26 | #define SECURITY_VALID_HOOKS (1 << NF_INET_LOCAL_IN) | \ | |
27 | (1 << NF_INET_FORWARD) | \ | |
28 | (1 << NF_INET_LOCAL_OUT) | |
29 | ||
35aad0ff | 30 | static const struct xt_table security_table = { |
560ee653 JM |
31 | .name = "security", |
32 | .valid_hooks = SECURITY_VALID_HOOKS, | |
560ee653 | 33 | .me = THIS_MODULE, |
f88e6a8a | 34 | .af = NFPROTO_IPV4, |
2b95efe7 | 35 | .priority = NF_IP_PRI_SECURITY, |
560ee653 JM |
36 | }; |
37 | ||
38 | static unsigned int | |
737535c5 JE |
39 | iptable_security_hook(unsigned int hook, struct sk_buff *skb, |
40 | const struct net_device *in, | |
41 | const struct net_device *out, | |
42 | int (*okfn)(struct sk_buff *)) | |
560ee653 | 43 | { |
2b21e051 | 44 | const struct net *net; |
560ee653 | 45 | |
2b21e051 JE |
46 | if (hook == NF_INET_LOCAL_OUT && |
47 | (skb->len < sizeof(struct iphdr) || | |
48 | ip_hdrlen(skb) < sizeof(struct iphdr))) | |
49 | /* Somebody is playing with raw sockets. */ | |
50 | return NF_ACCEPT; | |
560ee653 | 51 | |
2b21e051 JE |
52 | net = dev_net((in != NULL) ? in : out); |
53 | return ipt_do_table(skb, hook, in, out, net->ipv4.iptable_security); | |
560ee653 JM |
54 | } |
55 | ||
2b95efe7 | 56 | static struct nf_hook_ops *sectbl_ops __read_mostly; |
560ee653 JM |
57 | |
58 | static int __net_init iptable_security_net_init(struct net *net) | |
59 | { | |
e3eaa991 | 60 | struct ipt_replace *repl; |
560ee653 | 61 | |
e3eaa991 JE |
62 | repl = ipt_alloc_initial_table(&security_table); |
63 | if (repl == NULL) | |
64 | return -ENOMEM; | |
65 | net->ipv4.iptable_security = | |
66 | ipt_register_table(net, &security_table, repl); | |
67 | kfree(repl); | |
560ee653 JM |
68 | if (IS_ERR(net->ipv4.iptable_security)) |
69 | return PTR_ERR(net->ipv4.iptable_security); | |
70 | ||
71 | return 0; | |
72 | } | |
73 | ||
74 | static void __net_exit iptable_security_net_exit(struct net *net) | |
75 | { | |
f54e9367 | 76 | ipt_unregister_table(net, net->ipv4.iptable_security); |
560ee653 JM |
77 | } |
78 | ||
79 | static struct pernet_operations iptable_security_net_ops = { | |
80 | .init = iptable_security_net_init, | |
81 | .exit = iptable_security_net_exit, | |
82 | }; | |
83 | ||
84 | static int __init iptable_security_init(void) | |
85 | { | |
86 | int ret; | |
87 | ||
88 | ret = register_pernet_subsys(&iptable_security_net_ops); | |
89 | if (ret < 0) | |
90 | return ret; | |
91 | ||
2b95efe7 JE |
92 | sectbl_ops = xt_hook_link(&security_table, iptable_security_hook); |
93 | if (IS_ERR(sectbl_ops)) { | |
94 | ret = PTR_ERR(sectbl_ops); | |
560ee653 | 95 | goto cleanup_table; |
2b95efe7 | 96 | } |
560ee653 JM |
97 | |
98 | return ret; | |
99 | ||
100 | cleanup_table: | |
101 | unregister_pernet_subsys(&iptable_security_net_ops); | |
102 | return ret; | |
103 | } | |
104 | ||
105 | static void __exit iptable_security_fini(void) | |
106 | { | |
2b95efe7 | 107 | xt_hook_unlink(&security_table, sectbl_ops); |
560ee653 JM |
108 | unregister_pernet_subsys(&iptable_security_net_ops); |
109 | } | |
110 | ||
111 | module_init(iptable_security_init); | |
112 | module_exit(iptable_security_fini); |