/* SCTP kernel implementation

   * (C) Copyright IBM Corp. 2002, 2004
   * Copyright (c) 2002 Intel Corp.
   *

   * This file is part of the SCTP kernel implementation

   *
   * Sysctl related interfaces for SCTP.
   *

   * This SCTP implementation is free software;

   * you can redistribute it and/or modify it under the terms of
   * the GNU General Public License as published by
   * the Free Software Foundation; either version 2, or (at your option)
   * any later version.
   *

   * This SCTP implementation is distributed in the hope that it

   * will be useful, but WITHOUT ANY WARRANTY; without even the implied
   *                 ************************
   * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   * See the GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with GNU CC; see the file COPYING.  If not, write to
   * the Free Software Foundation, 59 Temple Place - Suite 330,
   * Boston, MA 02111-1307, USA.
   *
   * Please send any bug reports or fixes you make to the
   * email address(es):
   *    lksctp developers <lksctp-developers@lists.sourceforge.net>
   *
   * Or submit a bug report through the following website:
   *    http://www.sf.net/projects/lksctp
   *
   * Written or modified by:
   *    Mingqin Liu           <liuming@us.ibm.com>
   *    Jon Grimm             <jgrimm@us.ibm.com>
   *    Ardelle Fan           <ardelle.fan@intel.com>
   *    Ryan Layer            <rmlayer@us.ibm.com>
   *    Sridhar Samudrala     <sri@us.ibm.com>
   *
   * Any bugs reported given to us we will try to fix... any fixes shared will
   * be incorporated into the next SCTP release.
   */
  
  #include <net/sctp/structs.h>

  #include <net/sctp/sctp.h>

  #include <linux/sysctl.h>

  static int zero = 0;
  static int one = 1;
  static int timer_max = 86400000; /* ms in one day */
  static int int_max = INT_MAX;

  static int sack_timer_min = 1;
  static int sack_timer_max = 500;

  static int addr_scope_max = 3; /* check sctp_scope_policy_t in include/net/sctp/constants.h for max entries */

  static int rwnd_scale_max = 16;

  static unsigned long max_autoclose_min = 0;
  static unsigned long max_autoclose_max =
  	(MAX_SCHEDULE_TIMEOUT / HZ > UINT_MAX)
  	? UINT_MAX : MAX_SCHEDULE_TIMEOUT / HZ;

  extern long sysctl_sctp_mem[3];

  extern int sysctl_sctp_rmem[3];
  extern int sysctl_sctp_wmem[3];

  static ctl_table sctp_table[] = {
  	{

  		.procname	= "rto_initial",
  		.data		= &sctp_rto_initial,

  		.maxlen		= sizeof(unsigned int),

  		.mode		= 0644,

  		.proc_handler	= proc_dointvec_minmax,

  		.extra1         = &one,
  		.extra2         = &timer_max

  	},
  	{

  		.procname	= "rto_min",
  		.data		= &sctp_rto_min,

  		.maxlen		= sizeof(unsigned int),

  		.mode		= 0644,

  		.proc_handler	= proc_dointvec_minmax,

  		.extra1         = &one,
  		.extra2         = &timer_max

  	},
  	{

  		.procname	= "rto_max",
  		.data		= &sctp_rto_max,

  		.maxlen		= sizeof(unsigned int),

  		.mode		= 0644,

  		.proc_handler	= proc_dointvec_minmax,

  		.extra1         = &one,
  		.extra2         = &timer_max

  	},
  	{

  		.procname	= "valid_cookie_life",
  		.data		= &sctp_valid_cookie_life,

  		.maxlen		= sizeof(unsigned int),

  		.mode		= 0644,

  		.proc_handler	= proc_dointvec_minmax,

  		.extra1         = &one,
  		.extra2         = &timer_max

  	},
  	{

  		.procname	= "max_burst",
  		.data		= &sctp_max_burst,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec_minmax,

  		.extra1		= &zero,
  		.extra2		= &int_max

  	},
  	{

  		.procname	= "association_max_retrans",
  		.data		= &sctp_max_retrans_association,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec_minmax,

  		.extra1		= &one,
  		.extra2		= &int_max

  	},
  	{

  		.procname	= "sndbuf_policy",
  		.data		= &sctp_sndbuf_policy,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec,

  	},
  	{

  		.procname	= "rcvbuf_policy",
  		.data		= &sctp_rcvbuf_policy,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec,

  	},
  	{

  		.procname	= "path_max_retrans",
  		.data		= &sctp_max_retrans_path,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec_minmax,

  		.extra1		= &one,
  		.extra2		= &int_max

  	},
  	{

  		.procname	= "max_init_retransmits",
  		.data		= &sctp_max_retrans_init,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec_minmax,

  		.extra1		= &one,
  		.extra2		= &int_max

  	},
  	{

  		.procname	= "hb_interval",
  		.data		= &sctp_hb_interval,

  		.maxlen		= sizeof(unsigned int),

  		.mode		= 0644,

  		.proc_handler	= proc_dointvec_minmax,

  		.extra1         = &one,
  		.extra2         = &timer_max

  	},
  	{

  		.procname	= "cookie_preserve_enable",
  		.data		= &sctp_cookie_preserve_enable,

  		.maxlen		= sizeof(int),

  		.mode		= 0644,

  		.proc_handler	= proc_dointvec,

  	},
  	{

  		.procname	= "rto_alpha_exp_divisor",
  		.data		= &sctp_rto_alpha,
  		.maxlen		= sizeof(int),

  		.mode		= 0444,

  		.proc_handler	= proc_dointvec,

  	},
  	{

  		.procname	= "rto_beta_exp_divisor",
  		.data		= &sctp_rto_beta,
  		.maxlen		= sizeof(int),

  		.mode		= 0444,

  		.proc_handler	= proc_dointvec,

  	},
  	{

  		.procname	= "addip_enable",
  		.data		= &sctp_addip_enable,

  		.maxlen		= sizeof(int),
  		.mode		= 0644,
  		.proc_handler	= proc_dointvec,
  	},
  	{
  		.procname	= "default_auto_asconf",
  		.data		= &sctp_default_auto_asconf,

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

  		.proc_handler	= proc_dointvec,

  	},
  	{

  		.procname	= "prsctp_enable",
  		.data		= &sctp_prsctp_enable,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec,

  	},

  	{

  		.procname	= "sack_timeout",
  		.data		= &sctp_sack_timeout,

  		.maxlen		= sizeof(int),

  		.mode		= 0644,

  		.proc_handler	= proc_dointvec_minmax,

  		.extra1         = &sack_timer_min,
  		.extra2         = &sack_timer_max,
  	},

  	{

  		.procname	= "sctp_mem",
  		.data		= &sysctl_sctp_mem,
  		.maxlen		= sizeof(sysctl_sctp_mem),
  		.mode		= 0644,

  		.proc_handler	= proc_doulongvec_minmax

  	},
  	{

  		.procname	= "sctp_rmem",
  		.data		= &sysctl_sctp_rmem,
  		.maxlen		= sizeof(sysctl_sctp_rmem),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec,

  	},
  	{

  		.procname	= "sctp_wmem",
  		.data		= &sysctl_sctp_wmem,
  		.maxlen		= sizeof(sysctl_sctp_wmem),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec,

  	},

  	{

  		.procname	= "auth_enable",
  		.data		= &sctp_auth_enable,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec,

  	},

  	{

  		.procname	= "addip_noauth_enable",
  		.data		= &sctp_addip_noauth,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec,

  	},

  	{

  		.procname	= "addr_scope_policy",
  		.data		= &sctp_scope_policy,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec_minmax,

  		.extra1		= &zero,
  		.extra2		= &addr_scope_max,
  	},

  	{

  		.procname	= "rwnd_update_shift",
  		.data		= &sctp_rwnd_upd_shift,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,
  		.proc_handler	= &proc_dointvec_minmax,

  		.extra1		= &one,
  		.extra2		= &rwnd_scale_max,
  	},

  	{
  		.procname	= "max_autoclose",
  		.data		= &sctp_max_autoclose,
  		.maxlen		= sizeof(unsigned long),
  		.mode		= 0644,
  		.proc_handler	= &proc_doulongvec_minmax,
  		.extra1		= &max_autoclose_min,
  		.extra2		= &max_autoclose_max,
  	},

  	{ /* sentinel */ }

  };

  static struct ctl_path sctp_path[] = {

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

  	{ }

  };
  
  static struct ctl_table_header * sctp_sysctl_header;
  
  /* Sysctl registration.  */
  void sctp_sysctl_register(void)
  {

  	sctp_sysctl_header = register_sysctl_paths(sctp_path, sctp_table);

  }
  
  /* Sysctl deregistration.  */
  void sctp_sysctl_unregister(void)
  {
  	unregister_sysctl_table(sctp_sysctl_header);
  }