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- /*
- * "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>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
- #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 const struct xt_table security_table = {
- .name = "security",
- .valid_hooks = SECURITY_VALID_HOOKS,
- .me = THIS_MODULE,
- .af = NFPROTO_IPV4,
- .priority = NF_IP_PRI_SECURITY,
- };
- static unsigned int
- iptable_security_hook(void *priv, struct sk_buff *skb,
- const struct nf_hook_state *state)
- {
- if (state->hook == NF_INET_LOCAL_OUT &&
- (skb->len < sizeof(struct iphdr) ||
- ip_hdrlen(skb) < sizeof(struct iphdr)))
- /* Somebody is playing with raw sockets. */
- return NF_ACCEPT;
- 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_net_init(struct net *net)
- {
- struct ipt_replace *repl;
- repl = ipt_alloc_initial_table(&security_table);
- if (repl == NULL)
- return -ENOMEM;
- net->ipv4.iptable_security =
- ipt_register_table(net, &security_table, repl);
- kfree(repl);
- return PTR_ERR_OR_ZERO(net->ipv4.iptable_security);
- }
- static void __net_exit iptable_security_net_exit(struct net *net)
- {
- ipt_unregister_table(net, net->ipv4.iptable_security);
- }
- static struct pernet_operations iptable_security_net_ops = {
- .init = iptable_security_net_init,
- .exit = iptable_security_net_exit,
- };
- static int __init iptable_security_init(void)
- {
- int ret;
- ret = register_pernet_subsys(&iptable_security_net_ops);
- if (ret < 0)
- return ret;
- sectbl_ops = xt_hook_link(&security_table, iptable_security_hook);
- if (IS_ERR(sectbl_ops)) {
- ret = PTR_ERR(sectbl_ops);
- goto cleanup_table;
- }
- return ret;
- cleanup_table:
- unregister_pernet_subsys(&iptable_security_net_ops);
- return ret;
- }
- static void __exit iptable_security_fini(void)
- {
- xt_hook_unlink(&security_table, sectbl_ops);
- unregister_pernet_subsys(&iptable_security_net_ops);
- }
- module_init(iptable_security_init);
- module_exit(iptable_security_fini);
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