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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 | |
795aa6ef | 40 | iptable_security_hook(const struct nf_hook_ops *ops, struct sk_buff *skb, |
238e54c9 | 41 | const struct nf_hook_state *state) |
560ee653 | 42 | { |
795aa6ef | 43 | if (ops->hooknum == NF_INET_LOCAL_OUT && |
2b21e051 JE |
44 | (skb->len < sizeof(struct iphdr) || |
45 | ip_hdrlen(skb) < sizeof(struct iphdr))) | |
46 | /* Somebody is playing with raw sockets. */ | |
47 | return NF_ACCEPT; | |
560ee653 | 48 | |
1c491ba2 | 49 | return ipt_do_table(skb, ops->hooknum, state, |
9dff2c96 | 50 | state->net->ipv4.iptable_security); |
560ee653 JM |
51 | } |
52 | ||
2b95efe7 | 53 | static struct nf_hook_ops *sectbl_ops __read_mostly; |
560ee653 JM |
54 | |
55 | static int __net_init iptable_security_net_init(struct net *net) | |
56 | { | |
e3eaa991 | 57 | struct ipt_replace *repl; |
560ee653 | 58 | |
e3eaa991 JE |
59 | repl = ipt_alloc_initial_table(&security_table); |
60 | if (repl == NULL) | |
61 | return -ENOMEM; | |
62 | net->ipv4.iptable_security = | |
63 | ipt_register_table(net, &security_table, repl); | |
64 | kfree(repl); | |
8c6ffba0 | 65 | return PTR_ERR_OR_ZERO(net->ipv4.iptable_security); |
560ee653 JM |
66 | } |
67 | ||
68 | static void __net_exit iptable_security_net_exit(struct net *net) | |
69 | { | |
f54e9367 | 70 | ipt_unregister_table(net, net->ipv4.iptable_security); |
560ee653 JM |
71 | } |
72 | ||
73 | static struct pernet_operations iptable_security_net_ops = { | |
74 | .init = iptable_security_net_init, | |
75 | .exit = iptable_security_net_exit, | |
76 | }; | |
77 | ||
78 | static int __init iptable_security_init(void) | |
79 | { | |
80 | int ret; | |
81 | ||
82 | ret = register_pernet_subsys(&iptable_security_net_ops); | |
83 | if (ret < 0) | |
84 | return ret; | |
85 | ||
2b95efe7 JE |
86 | sectbl_ops = xt_hook_link(&security_table, iptable_security_hook); |
87 | if (IS_ERR(sectbl_ops)) { | |
88 | ret = PTR_ERR(sectbl_ops); | |
560ee653 | 89 | goto cleanup_table; |
2b95efe7 | 90 | } |
560ee653 JM |
91 | |
92 | return ret; | |
93 | ||
94 | cleanup_table: | |
95 | unregister_pernet_subsys(&iptable_security_net_ops); | |
96 | return ret; | |
97 | } | |
98 | ||
99 | static void __exit iptable_security_fini(void) | |
100 | { | |
2b95efe7 | 101 | xt_hook_unlink(&security_table, sectbl_ops); |
560ee653 JM |
102 | unregister_pernet_subsys(&iptable_security_net_ops); |
103 | } | |
104 | ||
105 | module_init(iptable_security_init); | |
106 | module_exit(iptable_security_fini); |