1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * "security" table for IPv6 4 * 5 * This is for use by Mandatory Access Control (MAC) security models, 6 * which need to be able to manage security policy in separate context 7 * to DAC. 8 * 9 * Based on iptable_mangle.c 10 * 11 * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling 12 * Copyright (C) 2000-2004 Netfilter Core Team <coreteam <at> netfilter.org> 13 * Copyright (C) 2008 Red Hat, Inc., James Morris <jmorris <at> redhat.com> 14 */ 15 #include <linux/module.h> 16 #include <linux/netfilter_ipv6/ip6_tables.h> 17 #include <linux/slab.h> 18 19 MODULE_LICENSE("GPL"); 20 MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>"); 21 MODULE_DESCRIPTION("ip6tables security table, for MAC rules"); 22 23 #define SECURITY_VALID_HOOKS (1 << NF_INET_LOCAL_IN) | \ 24 (1 << NF_INET_FORWARD) | \ 25 (1 << NF_INET_LOCAL_OUT) 26 27 static const struct xt_table security_table = { 28 .name = "security", 29 .valid_hooks = SECURITY_VALID_HOOKS, 30 .me = THIS_MODULE, 31 .af = NFPROTO_IPV6, 32 .priority = NF_IP6_PRI_SECURITY, 33 }; 34 35 static struct nf_hook_ops *sectbl_ops __read_mostly; 36 37 static int ip6table_security_table_init(struct net *net) 38 { 39 struct ip6t_replace *repl; 40 int ret; 41 42 repl = ip6t_alloc_initial_table(&security_table); 43 if (repl == NULL) 44 return -ENOMEM; 45 ret = ip6t_register_table(net, &security_table, repl, sectbl_ops); 46 kfree(repl); 47 return ret; 48 } 49 50 static void __net_exit ip6table_security_net_pre_exit(struct net *net) 51 { 52 ip6t_unregister_table_pre_exit(net, "security"); 53 } 54 55 static void __net_exit ip6table_security_net_exit(struct net *net) 56 { 57 ip6t_unregister_table_exit(net, "security"); 58 } 59 60 static struct pernet_operations ip6table_security_net_ops = { 61 .pre_exit = ip6table_security_net_pre_exit, 62 .exit = ip6table_security_net_exit, 63 }; 64 65 static int __init ip6table_security_init(void) 66 { 67 int ret = xt_register_template(&security_table, 68 ip6table_security_table_init); 69 70 if (ret < 0) 71 return ret; 72 73 sectbl_ops = xt_hook_ops_alloc(&security_table, ip6t_do_table); 74 if (IS_ERR(sectbl_ops)) { 75 xt_unregister_template(&security_table); 76 return PTR_ERR(sectbl_ops); 77 } 78 79 ret = register_pernet_subsys(&ip6table_security_net_ops); 80 if (ret < 0) { 81 kfree(sectbl_ops); 82 xt_unregister_template(&security_table); 83 return ret; 84 } 85 86 return ret; 87 } 88 89 static void __exit ip6table_security_fini(void) 90 { 91 unregister_pernet_subsys(&ip6table_security_net_ops); 92 xt_unregister_template(&security_table); 93 kfree(sectbl_ops); 94 } 95 96 module_init(ip6table_security_init); 97 module_exit(ip6table_security_fini); 98