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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> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
560ee653 JM |
21 | #include <net/ip.h> |
22 | ||
23 | MODULE_LICENSE("GPL"); | |
24 | MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>"); | |
25 | MODULE_DESCRIPTION("iptables security table, for MAC rules"); | |
26 | ||
27 | #define SECURITY_VALID_HOOKS (1 << NF_INET_LOCAL_IN) | \ | |
28 | (1 << NF_INET_FORWARD) | \ | |
29 | (1 << NF_INET_LOCAL_OUT) | |
30 | ||
35aad0ff | 31 | static const struct xt_table security_table = { |
560ee653 JM |
32 | .name = "security", |
33 | .valid_hooks = SECURITY_VALID_HOOKS, | |
560ee653 | 34 | .me = THIS_MODULE, |
f88e6a8a | 35 | .af = NFPROTO_IPV4, |
2b95efe7 | 36 | .priority = NF_IP_PRI_SECURITY, |
560ee653 JM |
37 | }; |
38 | ||
39 | static unsigned int | |
737535c5 JE |
40 | iptable_security_hook(unsigned int hook, struct sk_buff *skb, |
41 | const struct net_device *in, | |
42 | const struct net_device *out, | |
43 | int (*okfn)(struct sk_buff *)) | |
560ee653 | 44 | { |
2b21e051 | 45 | const struct net *net; |
560ee653 | 46 | |
2b21e051 JE |
47 | if (hook == NF_INET_LOCAL_OUT && |
48 | (skb->len < sizeof(struct iphdr) || | |
49 | ip_hdrlen(skb) < sizeof(struct iphdr))) | |
50 | /* Somebody is playing with raw sockets. */ | |
51 | return NF_ACCEPT; | |
560ee653 | 52 | |
2b21e051 JE |
53 | net = dev_net((in != NULL) ? in : out); |
54 | return ipt_do_table(skb, hook, in, out, net->ipv4.iptable_security); | |
560ee653 JM |
55 | } |
56 | ||
2b95efe7 | 57 | static struct nf_hook_ops *sectbl_ops __read_mostly; |
560ee653 JM |
58 | |
59 | static int __net_init iptable_security_net_init(struct net *net) | |
60 | { | |
e3eaa991 | 61 | struct ipt_replace *repl; |
560ee653 | 62 | |
e3eaa991 JE |
63 | repl = ipt_alloc_initial_table(&security_table); |
64 | if (repl == NULL) | |
65 | return -ENOMEM; | |
66 | net->ipv4.iptable_security = | |
67 | ipt_register_table(net, &security_table, repl); | |
68 | kfree(repl); | |
560ee653 JM |
69 | if (IS_ERR(net->ipv4.iptable_security)) |
70 | return PTR_ERR(net->ipv4.iptable_security); | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | static void __net_exit iptable_security_net_exit(struct net *net) | |
76 | { | |
f54e9367 | 77 | ipt_unregister_table(net, net->ipv4.iptable_security); |
560ee653 JM |
78 | } |
79 | ||
80 | static struct pernet_operations iptable_security_net_ops = { | |
81 | .init = iptable_security_net_init, | |
82 | .exit = iptable_security_net_exit, | |
83 | }; | |
84 | ||
85 | static int __init iptable_security_init(void) | |
86 | { | |
87 | int ret; | |
88 | ||
89 | ret = register_pernet_subsys(&iptable_security_net_ops); | |
90 | if (ret < 0) | |
91 | return ret; | |
92 | ||
2b95efe7 JE |
93 | sectbl_ops = xt_hook_link(&security_table, iptable_security_hook); |
94 | if (IS_ERR(sectbl_ops)) { | |
95 | ret = PTR_ERR(sectbl_ops); | |
560ee653 | 96 | goto cleanup_table; |
2b95efe7 | 97 | } |
560ee653 JM |
98 | |
99 | return ret; | |
100 | ||
101 | cleanup_table: | |
102 | unregister_pernet_subsys(&iptable_security_net_ops); | |
103 | return ret; | |
104 | } | |
105 | ||
106 | static void __exit iptable_security_fini(void) | |
107 | { | |
2b95efe7 | 108 | xt_hook_unlink(&security_table, sectbl_ops); |
560ee653 JM |
109 | unregister_pernet_subsys(&iptable_security_net_ops); |
110 | } | |
111 | ||
112 | module_init(iptable_security_init); | |
113 | module_exit(iptable_security_fini); |