// SPDX-License-Identifier: GPL-2.0-only
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/*
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* This is the 1999 rewrite of IP Firewalling, aiming for kernel 2.3.x.
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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@netfilter.org>
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.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("Netfilter Core Team <coreteam@netfilter.org>");
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MODULE_DESCRIPTION("ip6tables filter table");
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#define FILTER_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_filter_table_init(struct net *net);
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static const struct xt_table packet_filter = {
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.name = "filter",
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.valid_hooks = FILTER_VALID_HOOKS,
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.me = THIS_MODULE,
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.af = NFPROTO_IPV6,
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.priority = NF_IP6_PRI_FILTER,
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.table_init = ip6table_filter_table_init,
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};
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/* The work comes in here from netfilter.c. */
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static unsigned int
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ip6table_filter_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_filter);
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}
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static struct nf_hook_ops *filter_ops __read_mostly;
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/* Default to forward because I got too much mail already. */
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static bool forward = true;
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module_param(forward, bool, 0000);
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static int __net_init ip6table_filter_table_init(struct net *net)
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{
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struct ip6t_replace *repl;
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int err;
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if (net->ipv6.ip6table_filter)
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return 0;
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repl = ip6t_alloc_initial_table(&packet_filter);
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if (repl == NULL)
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return -ENOMEM;
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/* Entry 1 is the FORWARD hook */
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((struct ip6t_standard *)repl->entries)[1].target.verdict =
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forward ? -NF_ACCEPT - 1 : -NF_DROP - 1;
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err = ip6t_register_table(net, &packet_filter, repl, filter_ops,
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&net->ipv6.ip6table_filter);
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kfree(repl);
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return err;
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}
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static int __net_init ip6table_filter_net_init(struct net *net)
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{
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if (net == &init_net || !forward)
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return ip6table_filter_table_init(net);
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return 0;
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}
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static void __net_exit ip6table_filter_net_pre_exit(struct net *net)
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{
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if (net->ipv6.ip6table_filter)
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ip6t_unregister_table_pre_exit(net, net->ipv6.ip6table_filter,
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filter_ops);
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}
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static void __net_exit ip6table_filter_net_exit(struct net *net)
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{
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if (!net->ipv6.ip6table_filter)
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return;
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ip6t_unregister_table_exit(net, net->ipv6.ip6table_filter);
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net->ipv6.ip6table_filter = NULL;
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}
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static struct pernet_operations ip6table_filter_net_ops = {
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.init = ip6table_filter_net_init,
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.pre_exit = ip6table_filter_net_pre_exit,
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.exit = ip6table_filter_net_exit,
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};
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static int __init ip6table_filter_init(void)
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{
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int ret;
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filter_ops = xt_hook_ops_alloc(&packet_filter, ip6table_filter_hook);
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if (IS_ERR(filter_ops))
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return PTR_ERR(filter_ops);
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ret = register_pernet_subsys(&ip6table_filter_net_ops);
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if (ret < 0)
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kfree(filter_ops);
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return ret;
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}
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static void __exit ip6table_filter_fini(void)
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{
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unregister_pernet_subsys(&ip6table_filter_net_ops);
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kfree(filter_ops);
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}
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module_init(ip6table_filter_init);
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module_exit(ip6table_filter_fini);
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