1 /* 2 * "security" table for IPv6 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_ipv6/ip6_tables.h> 20 #include <linux/slab.h> 21 22 MODULE_LICENSE("GPL"); 23 MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>"); 24 MODULE_DESCRIPTION("ip6tables 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 30 static int __net_init ip6table_security_table_init(struct net *net); 31 32 static const struct xt_table security_table = { 33 .name = "security", 34 .valid_hooks = SECURITY_VALID_HOOKS, 35 .me = THIS_MODULE, 36 .af = NFPROTO_IPV6, 37 .priority = NF_IP6_PRI_SECURITY, 38 .table_init = ip6table_security_table_init, 39 }; 40 41 static unsigned int 42 ip6table_security_hook(void *priv, struct sk_buff *skb, 43 const struct nf_hook_state *state) 44 { 45 return ip6t_do_table(skb, state, state->net->ipv6.ip6table_security); 46 } 47 48 static struct nf_hook_ops *sectbl_ops __read_mostly; 49 50 static int __net_init ip6table_security_table_init(struct net *net) 51 { 52 struct ip6t_replace *repl; 53 int ret; 54 55 if (net->ipv6.ip6table_security) 56 return 0; 57 58 repl = ip6t_alloc_initial_table(&security_table); 59 if (repl == NULL) 60 return -ENOMEM; 61 ret = ip6t_register_table(net, &security_table, repl, sectbl_ops, 62 &net->ipv6.ip6table_security); 63 kfree(repl); 64 return ret; 65 } 66 67 static void __net_exit ip6table_security_net_exit(struct net *net) 68 { 69 if (!net->ipv6.ip6table_security) 70 return; 71 ip6t_unregister_table(net, net->ipv6.ip6table_security, sectbl_ops); 72 net->ipv6.ip6table_security = NULL; 73 } 74 75 static struct pernet_operations ip6table_security_net_ops = { 76 .exit = ip6table_security_net_exit, 77 }; 78 79 static int __init ip6table_security_init(void) 80 { 81 int ret; 82 83 sectbl_ops = xt_hook_ops_alloc(&security_table, ip6table_security_hook); 84 if (IS_ERR(sectbl_ops)) 85 return PTR_ERR(sectbl_ops); 86 87 ret = register_pernet_subsys(&ip6table_security_net_ops); 88 if (ret < 0) { 89 kfree(sectbl_ops); 90 return ret; 91 } 92 93 ret = ip6table_security_table_init(&init_net); 94 if (ret) { 95 unregister_pernet_subsys(&ip6table_security_net_ops); 96 kfree(sectbl_ops); 97 } 98 return ret; 99 } 100 101 static void __exit ip6table_security_fini(void) 102 { 103 unregister_pernet_subsys(&ip6table_security_net_ops); 104 kfree(sectbl_ops); 105 } 106 107 module_init(ip6table_security_init); 108 module_exit(ip6table_security_fini); 109