// SPDX-License-Identifier: GPL-2.0

  /*
   * sysctl_net_ipv6.c: sysctl interface to net IPV6 subsystem.
   *
   * Changes:
   * YOSHIFUJI Hideaki @USAGI:	added icmp sysctl table.
   */
  
  #include <linux/mm.h>
  #include <linux/sysctl.h>

  #include <linux/in6.h>
  #include <linux/ipv6.h>

  #include <linux/slab.h>

  #include <linux/export.h>

  #include <net/ndisc.h>
  #include <net/ipv6.h>
  #include <net/addrconf.h>

  #include <net/inet_frag.h>

  #ifdef CONFIG_NETLABEL
  #include <net/calipso.h>
  #endif

  static int one = 1;

  static int auto_flowlabels_min;
  static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;

  static struct ctl_table ipv6_table_template[] = {

  	{

  		.procname	= "bindv6only",

  		.data		= &init_net.ipv6.sysctl.bindv6only,

  		.maxlen		= sizeof(int),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec

  	},

  	{
  		.procname	= "anycast_src_echo_reply",

  		.data		= &init_net.ipv6.sysctl.anycast_src_echo_reply,

  		.maxlen		= sizeof(int),
  		.mode		= 0644,
  		.proc_handler	= proc_dointvec
  	},

  	{
  		.procname	= "flowlabel_consistency",
  		.data		= &init_net.ipv6.sysctl.flowlabel_consistency,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,
  		.proc_handler	= proc_dointvec
  	},

  	{

  		.procname	= "auto_flowlabels",
  		.data		= &init_net.ipv6.sysctl.auto_flowlabels,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec_minmax,
  		.extra1		= &auto_flowlabels_min,
  		.extra2		= &auto_flowlabels_max

  	},
  	{

  		.procname	= "fwmark_reflect",
  		.data		= &init_net.ipv6.sysctl.fwmark_reflect,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,
  		.proc_handler	= proc_dointvec
  	},

  	{
  		.procname	= "idgen_retries",
  		.data		= &init_net.ipv6.sysctl.idgen_retries,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,
  		.proc_handler	= proc_dointvec,
  	},
  	{
  		.procname	= "idgen_delay",
  		.data		= &init_net.ipv6.sysctl.idgen_delay,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,
  		.proc_handler	= proc_dointvec_jiffies,
  	},

  	{
  		.procname	= "flowlabel_state_ranges",
  		.data		= &init_net.ipv6.sysctl.flowlabel_state_ranges,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,
  		.proc_handler	= proc_dointvec
  	},

  	{
  		.procname	= "ip_nonlocal_bind",
  		.data		= &init_net.ipv6.sysctl.ip_nonlocal_bind,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,
  		.proc_handler	= proc_dointvec
  	},

  	{
  		.procname	= "flowlabel_reflect",
  		.data		= &init_net.ipv6.sysctl.flowlabel_reflect,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,
  		.proc_handler	= proc_dointvec,
  	},

  	{ }

  };

  static struct ctl_table ipv6_rotable[] = {

  	{

  		.procname	= "mld_max_msf",
  		.data		= &sysctl_mld_max_msf,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec

  	},

  	{
  		.procname	= "mld_qrv",
  		.data		= &sysctl_mld_qrv,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,
  		.proc_handler	= proc_dointvec_minmax,
  		.extra1		= &one
  	},

  #ifdef CONFIG_NETLABEL
  	{
  		.procname	= "calipso_cache_enable",
  		.data		= &calipso_cache_enabled,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,
  		.proc_handler	= proc_dointvec,
  	},
  	{
  		.procname	= "calipso_cache_bucket_size",
  		.data		= &calipso_cache_bucketsize,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,
  		.proc_handler	= proc_dointvec,
  	},
  #endif /* CONFIG_NETLABEL */

  	{ }

  };

  static int __net_init ipv6_sysctl_net_init(struct net *net)

  {

  	struct ctl_table *ipv6_table;
  	struct ctl_table *ipv6_route_table;
  	struct ctl_table *ipv6_icmp_table;
  	int err;
  
  	err = -ENOMEM;
  	ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
  			     GFP_KERNEL);
  	if (!ipv6_table)
  		goto out;

  	ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;

  	ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;

  	ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;

  	ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;

  	ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect;

  	ipv6_table[5].data = &net->ipv6.sysctl.idgen_retries;
  	ipv6_table[6].data = &net->ipv6.sysctl.idgen_delay;

  	ipv6_table[7].data = &net->ipv6.sysctl.flowlabel_state_ranges;

  	ipv6_table[8].data = &net->ipv6.sysctl.ip_nonlocal_bind;

  	ipv6_table[9].data = &net->ipv6.sysctl.flowlabel_reflect;

  
  	ipv6_route_table = ipv6_route_sysctl_init(net);
  	if (!ipv6_route_table)
  		goto out_ipv6_table;
  
  	ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
  	if (!ipv6_icmp_table)
  		goto out_ipv6_route_table;

  	net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
  	if (!net->ipv6.sysctl.hdr)

  		goto out_ipv6_icmp_table;

  	net->ipv6.sysctl.route_hdr =
  		register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
  	if (!net->ipv6.sysctl.route_hdr)
  		goto out_unregister_ipv6_table;
  
  	net->ipv6.sysctl.icmp_hdr =
  		register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
  	if (!net->ipv6.sysctl.icmp_hdr)
  		goto out_unregister_route_table;

  	err = 0;
  out:
  	return err;

  out_unregister_route_table:
  	unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
  out_unregister_ipv6_table:
  	unregister_net_sysctl_table(net->ipv6.sysctl.hdr);

  out_ipv6_icmp_table:
  	kfree(ipv6_icmp_table);
  out_ipv6_route_table:
  	kfree(ipv6_route_table);
  out_ipv6_table:
  	kfree(ipv6_table);
  	goto out;

  }

  static void __net_exit ipv6_sysctl_net_exit(struct net *net)

  {

  	struct ctl_table *ipv6_table;
  	struct ctl_table *ipv6_route_table;
  	struct ctl_table *ipv6_icmp_table;

  	ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
  	ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
  	ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;

  	unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
  	unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
  	unregister_net_sysctl_table(net->ipv6.sysctl.hdr);

  
  	kfree(ipv6_table);
  	kfree(ipv6_route_table);
  	kfree(ipv6_icmp_table);

  }
  
  static struct pernet_operations ipv6_sysctl_net_ops = {
  	.init = ipv6_sysctl_net_init,
  	.exit = ipv6_sysctl_net_exit,
  };

  static struct ctl_table_header *ip6_header;

  int ipv6_sysctl_register(void)
  {

  	int err = -ENOMEM;

  	ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);

  	if (!ip6_header)

  		goto out;
  
  	err = register_pernet_subsys(&ipv6_sysctl_net_ops);
  	if (err)
  		goto err_pernet;
  out:
  	return err;
  
  err_pernet:
  	unregister_net_sysctl_table(ip6_header);
  	goto out;

  }

  void ipv6_sysctl_unregister(void)
  {

  	unregister_net_sysctl_table(ip6_header);

  	unregister_pernet_subsys(&ipv6_sysctl_net_ops);

  }