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> | |
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 | ||
b9e69e12 FW |
31 | static int __net_init iptable_security_table_init(struct net *net); |
32 | ||
35aad0ff | 33 | static const struct xt_table security_table = { |
560ee653 JM |
34 | .name = "security", |
35 | .valid_hooks = SECURITY_VALID_HOOKS, | |
560ee653 | 36 | .me = THIS_MODULE, |
f88e6a8a | 37 | .af = NFPROTO_IPV4, |
2b95efe7 | 38 | .priority = NF_IP_PRI_SECURITY, |
b9e69e12 | 39 | .table_init = iptable_security_table_init, |
560ee653 JM |
40 | }; |
41 | ||
42 | static unsigned int | |
06198b34 | 43 | iptable_security_hook(void *priv, struct sk_buff *skb, |
238e54c9 | 44 | const struct nf_hook_state *state) |
560ee653 | 45 | { |
6cb8ff3f | 46 | if (state->hook == NF_INET_LOCAL_OUT && |
2b21e051 JE |
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 | |
6cb8ff3f | 52 | return ipt_do_table(skb, state, state->net->ipv4.iptable_security); |
560ee653 JM |
53 | } |
54 | ||
2b95efe7 | 55 | static struct nf_hook_ops *sectbl_ops __read_mostly; |
560ee653 | 56 | |
b9e69e12 | 57 | static int __net_init iptable_security_table_init(struct net *net) |
560ee653 | 58 | { |
e3eaa991 | 59 | struct ipt_replace *repl; |
a67dd266 | 60 | int ret; |
560ee653 | 61 | |
b9e69e12 FW |
62 | if (net->ipv4.iptable_security) |
63 | return 0; | |
64 | ||
e3eaa991 JE |
65 | repl = ipt_alloc_initial_table(&security_table); |
66 | if (repl == NULL) | |
67 | return -ENOMEM; | |
a67dd266 FW |
68 | ret = ipt_register_table(net, &security_table, repl, sectbl_ops, |
69 | &net->ipv4.iptable_security); | |
e3eaa991 | 70 | kfree(repl); |
a67dd266 | 71 | return ret; |
560ee653 JM |
72 | } |
73 | ||
74 | static void __net_exit iptable_security_net_exit(struct net *net) | |
75 | { | |
b9e69e12 FW |
76 | if (!net->ipv4.iptable_security) |
77 | return; | |
78 | ||
a67dd266 | 79 | ipt_unregister_table(net, net->ipv4.iptable_security, sectbl_ops); |
b9e69e12 | 80 | net->ipv4.iptable_security = NULL; |
560ee653 JM |
81 | } |
82 | ||
83 | static struct pernet_operations iptable_security_net_ops = { | |
560ee653 JM |
84 | .exit = iptable_security_net_exit, |
85 | }; | |
86 | ||
87 | static int __init iptable_security_init(void) | |
88 | { | |
89 | int ret; | |
90 | ||
b9e69e12 FW |
91 | sectbl_ops = xt_hook_ops_alloc(&security_table, iptable_security_hook); |
92 | if (IS_ERR(sectbl_ops)) | |
93 | return PTR_ERR(sectbl_ops); | |
94 | ||
560ee653 | 95 | ret = register_pernet_subsys(&iptable_security_net_ops); |
b9e69e12 FW |
96 | if (ret < 0) { |
97 | kfree(sectbl_ops); | |
560ee653 | 98 | return ret; |
2b95efe7 | 99 | } |
560ee653 | 100 | |
b9e69e12 FW |
101 | ret = iptable_security_table_init(&init_net); |
102 | if (ret) { | |
103 | unregister_pernet_subsys(&iptable_security_net_ops); | |
104 | kfree(sectbl_ops); | |
105 | } | |
560ee653 | 106 | |
560ee653 JM |
107 | return ret; |
108 | } | |
109 | ||
110 | static void __exit iptable_security_fini(void) | |
111 | { | |
560ee653 | 112 | unregister_pernet_subsys(&iptable_security_net_ops); |
b9e69e12 | 113 | kfree(sectbl_ops); |
560ee653 JM |
114 | } |
115 | ||
116 | module_init(iptable_security_init); | |
117 | module_exit(iptable_security_fini); |