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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * "security" table
- *
- * This is for use by Mandatory Access Control (MAC) security models,
- * which need to be able to manage security policy in separate context
- * to DAC.
- *
- * Based on iptable_mangle.c
- *
- * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
- * Copyright (C) 2000-2004 Netfilter Core Team <coreteam <at> netfilter.org>
- * Copyright (C) 2008 Red Hat, Inc., James Morris <jmorris <at> redhat.com>
- */
- #include <linux/module.h>
- #include <linux/netfilter_ipv4/ip_tables.h>
- #include <linux/slab.h>
- #include <net/ip.h>
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>");
- MODULE_DESCRIPTION("iptables security table, for MAC rules");
- #define SECURITY_VALID_HOOKS (1 << NF_INET_LOCAL_IN) | \
- (1 << NF_INET_FORWARD) | \
- (1 << NF_INET_LOCAL_OUT)
- static int __net_init iptable_security_table_init(struct net *net);
- static const struct xt_table security_table = {
- .name = "security",
- .valid_hooks = SECURITY_VALID_HOOKS,
- .me = THIS_MODULE,
- .af = NFPROTO_IPV4,
- .priority = NF_IP_PRI_SECURITY,
- .table_init = iptable_security_table_init,
- };
- static unsigned int
- iptable_security_hook(void *priv, struct sk_buff *skb,
- const struct nf_hook_state *state)
- {
- return ipt_do_table(skb, state, state->net->ipv4.iptable_security);
- }
- static struct nf_hook_ops *sectbl_ops __read_mostly;
- static int __net_init iptable_security_table_init(struct net *net)
- {
- struct ipt_replace *repl;
- int ret;
- if (net->ipv4.iptable_security)
- return 0;
- repl = ipt_alloc_initial_table(&security_table);
- if (repl == NULL)
- return -ENOMEM;
- ret = ipt_register_table(net, &security_table, repl, sectbl_ops,
- &net->ipv4.iptable_security);
- kfree(repl);
- return ret;
- }
- static void __net_exit iptable_security_net_pre_exit(struct net *net)
- {
- if (net->ipv4.iptable_security)
- ipt_unregister_table_pre_exit(net, net->ipv4.iptable_security,
- sectbl_ops);
- }
- static void __net_exit iptable_security_net_exit(struct net *net)
- {
- if (!net->ipv4.iptable_security)
- return;
- ipt_unregister_table_exit(net, net->ipv4.iptable_security);
- net->ipv4.iptable_security = NULL;
- }
- static struct pernet_operations iptable_security_net_ops = {
- .pre_exit = iptable_security_net_pre_exit,
- .exit = iptable_security_net_exit,
- };
- static int __init iptable_security_init(void)
- {
- int ret;
- sectbl_ops = xt_hook_ops_alloc(&security_table, iptable_security_hook);
- if (IS_ERR(sectbl_ops))
- return PTR_ERR(sectbl_ops);
- ret = register_pernet_subsys(&iptable_security_net_ops);
- if (ret < 0) {
- kfree(sectbl_ops);
- return ret;
- }
- ret = iptable_security_table_init(&init_net);
- if (ret) {
- unregister_pernet_subsys(&iptable_security_net_ops);
- kfree(sectbl_ops);
- }
- return ret;
- }
- static void __exit iptable_security_fini(void)
- {
- unregister_pernet_subsys(&iptable_security_net_ops);
- kfree(sectbl_ops);
- }
- module_init(iptable_security_init);
- module_exit(iptable_security_fini);
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