/*
   * 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>

  static struct ctl_table empty[1];

  static ctl_table ipv6_static_skeleton[] = {
  	{
  		.procname	= "neigh",
  		.maxlen		= 0,
  		.mode		= 0555,
  		.child		= empty,
  	},
  	{ }
  };

  static ctl_table ipv6_table_template[] = {

  	{

  		.procname	= "route",
  		.maxlen		= 0,
  		.mode		= 0555,

  		.child		= ipv6_route_table_template

  	},
  	{

  		.procname	= "icmp",
  		.maxlen		= 0,
  		.mode		= 0555,

  		.child		= ipv6_icmp_table_template

  	},
  	{

  		.procname	= "bindv6only",

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

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

  		.proc_handler	= proc_dointvec

  	},

  	{ }

  };

  static ctl_table ipv6_rotable[] = {

  	{

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

  		.proc_handler	= proc_dointvec

  	},

  	{ }

  };

  struct ctl_path net_ipv6_ctl_path[] = {

  	{ .procname = "net", },
  	{ .procname = "ipv6", },

  	{ },

  };

  EXPORT_SYMBOL_GPL(net_ipv6_ctl_path);

  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_route_table = ipv6_route_sysctl_init(net);
  	if (!ipv6_route_table)
  		goto out_ipv6_table;

  	ipv6_table[0].child = ipv6_route_table;

  
  	ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
  	if (!ipv6_icmp_table)
  		goto out_ipv6_route_table;

  	ipv6_table[1].child = ipv6_icmp_table;

  	ipv6_table[2].data = &net->ipv6.sysctl.bindv6only;

  	net->ipv6.sysctl.table = register_net_sysctl_table(net, net_ipv6_ctl_path,
  							   ipv6_table);
  	if (!net->ipv6.sysctl.table)

  		goto out_ipv6_icmp_table;
  
  	err = 0;
  out:
  	return err;

  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.table->ctl_table_arg;
  	ipv6_route_table = ipv6_table[0].child;
  	ipv6_icmp_table = ipv6_table[1].child;
  
  	unregister_net_sysctl_table(net->ipv6.sysctl.table);
  
  	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_rotable(net_ipv6_ctl_path, ipv6_rotable);

  	if (ip6_header == NULL)
  		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);

  }

  
  static struct ctl_table_header *ip6_base;
  
  int ipv6_static_sysctl_register(void)
  {

  	ip6_base = register_sysctl_paths(net_ipv6_ctl_path, ipv6_static_skeleton);

  	if (ip6_base == NULL)
  		return -ENOMEM;
  	return 0;
  }
  
  void ipv6_static_sysctl_unregister(void)
  {
  	unregister_net_sysctl_table(ip6_base);
  }