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 const struct xt_table security_table = { 31 .name = "security", 32 .valid_hooks = SECURITY_VALID_HOOKS, 33 .me = THIS_MODULE, 34 .af = NFPROTO_IPV6, 35 .priority = NF_IP6_PRI_SECURITY, 36 }; 37 38 static unsigned int 39 ip6table_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 *)) 43 { 44 const struct net *net = dev_net((in != NULL) ? in : out); 45 46 return ip6t_do_table(skb, hook, in, out, net->ipv6.ip6table_security); 47 } 48 49 static struct nf_hook_ops *sectbl_ops __read_mostly; 50 51 static int __net_init ip6table_security_net_init(struct net *net) 52 { 53 struct ip6t_replace *repl; 54 55 repl = ip6t_alloc_initial_table(&security_table); 56 if (repl == NULL) 57 return -ENOMEM; 58 net->ipv6.ip6table_security = 59 ip6t_register_table(net, &security_table, repl); 60 kfree(repl); 61 return PTR_RET(net->ipv6.ip6table_security); 62 } 63 64 static void __net_exit ip6table_security_net_exit(struct net *net) 65 { 66 ip6t_unregister_table(net, net->ipv6.ip6table_security); 67 } 68 69 static struct pernet_operations ip6table_security_net_ops = { 70 .init = ip6table_security_net_init, 71 .exit = ip6table_security_net_exit, 72 }; 73 74 static int __init ip6table_security_init(void) 75 { 76 int ret; 77 78 ret = register_pernet_subsys(&ip6table_security_net_ops); 79 if (ret < 0) 80 return ret; 81 82 sectbl_ops = xt_hook_link(&security_table, ip6table_security_hook); 83 if (IS_ERR(sectbl_ops)) { 84 ret = PTR_ERR(sectbl_ops); 85 goto cleanup_table; 86 } 87 88 return ret; 89 90 cleanup_table: 91 unregister_pernet_subsys(&ip6table_security_net_ops); 92 return ret; 93 } 94 95 static void __exit ip6table_security_fini(void) 96 { 97 xt_hook_unlink(&security_table, sectbl_ops); 98 unregister_pernet_subsys(&ip6table_security_net_ops); 99 } 100 101 module_init(ip6table_security_init); 102 module_exit(ip6table_security_fini); 103