// SPDX-License-Identifier: GPL-2.0-only
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/*
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* "security" table for IPv6
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*
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* This is for use by Mandatory Access Control (MAC) security models,
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* which need to be able to manage security policy in separate context
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* to DAC.
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*
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* Based on iptable_mangle.c
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*
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* Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
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* Copyright (C) 2000-2004 Netfilter Core Team <coreteam <at> netfilter.org>
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* Copyright (C) 2008 Red Hat, Inc., James Morris <jmorris <at> redhat.com>
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*/
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#include <linux/module.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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#include <linux/slab.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>");
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MODULE_DESCRIPTION("ip6tables security table, for MAC rules");
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#define SECURITY_VALID_HOOKS (1 << NF_INET_LOCAL_IN) | \
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(1 << NF_INET_FORWARD) | \
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(1 << NF_INET_LOCAL_OUT)
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static int __net_init ip6table_security_table_init(struct net *net);
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static const struct xt_table security_table = {
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.name = "security",
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.valid_hooks = SECURITY_VALID_HOOKS,
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.me = THIS_MODULE,
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.af = NFPROTO_IPV6,
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.priority = NF_IP6_PRI_SECURITY,
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.table_init = ip6table_security_table_init,
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};
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static unsigned int
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ip6table_security_hook(void *priv, struct sk_buff *skb,
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const struct nf_hook_state *state)
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{
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return ip6t_do_table(skb, state, state->net->ipv6.ip6table_security);
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}
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static struct nf_hook_ops *sectbl_ops __read_mostly;
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static int __net_init ip6table_security_table_init(struct net *net)
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{
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struct ip6t_replace *repl;
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int ret;
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if (net->ipv6.ip6table_security)
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return 0;
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repl = ip6t_alloc_initial_table(&security_table);
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if (repl == NULL)
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return -ENOMEM;
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ret = ip6t_register_table(net, &security_table, repl, sectbl_ops,
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&net->ipv6.ip6table_security);
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kfree(repl);
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return ret;
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}
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static void __net_exit ip6table_security_net_pre_exit(struct net *net)
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{
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if (net->ipv6.ip6table_security)
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ip6t_unregister_table_pre_exit(net, net->ipv6.ip6table_security,
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sectbl_ops);
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}
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static void __net_exit ip6table_security_net_exit(struct net *net)
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{
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if (!net->ipv6.ip6table_security)
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return;
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ip6t_unregister_table_exit(net, net->ipv6.ip6table_security);
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net->ipv6.ip6table_security = NULL;
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}
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static struct pernet_operations ip6table_security_net_ops = {
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.pre_exit = ip6table_security_net_pre_exit,
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.exit = ip6table_security_net_exit,
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};
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static int __init ip6table_security_init(void)
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{
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int ret;
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sectbl_ops = xt_hook_ops_alloc(&security_table, ip6table_security_hook);
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if (IS_ERR(sectbl_ops))
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return PTR_ERR(sectbl_ops);
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ret = register_pernet_subsys(&ip6table_security_net_ops);
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if (ret < 0) {
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kfree(sectbl_ops);
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return ret;
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}
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ret = ip6table_security_table_init(&init_net);
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if (ret) {
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unregister_pernet_subsys(&ip6table_security_net_ops);
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kfree(sectbl_ops);
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}
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return ret;
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}
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static void __exit ip6table_security_fini(void)
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{
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unregister_pernet_subsys(&ip6table_security_net_ops);
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kfree(sectbl_ops);
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}
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module_init(ip6table_security_init);
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module_exit(ip6table_security_fini);
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