// SPDX-License-Identifier: GPL-2.0-only

  /*
   *  net/dccp/sysctl.c
   *
   *  An implementation of the DCCP protocol
   *  Arnaldo Carvalho de Melo <acme@mandriva.com>

   */

  #include <linux/mm.h>
  #include <linux/sysctl.h>

  #include "dccp.h"

  #include "feat.h"

  
  #ifndef CONFIG_SYSCTL
  #error This file should not be compiled without CONFIG_SYSCTL defined
  #endif

  /* Boundary values */

  static int		u8_max   = 0xFF;

  static unsigned long	seqw_min = DCCPF_SEQ_WMIN,
  			seqw_max = 0xFFFFFFFF;		/* maximum on 32 bit */

  static struct ctl_table dccp_default_table[] = {
  	{

  		.procname	= "seq_window",

  		.data		= &sysctl_dccp_sequence_window,
  		.maxlen		= sizeof(sysctl_dccp_sequence_window),

  		.mode		= 0644,

  		.proc_handler	= proc_doulongvec_minmax,
  		.extra1		= &seqw_min,		/* RFC 4340, 7.5.2 */

  		.extra2		= &seqw_max,

  	},
  	{

  		.procname	= "rx_ccid",

  		.data		= &sysctl_dccp_rx_ccid,
  		.maxlen		= sizeof(sysctl_dccp_rx_ccid),

  		.mode		= 0644,

  		.proc_handler	= proc_dointvec_minmax,

  		.extra1		= SYSCTL_ZERO,

  		.extra2		= &u8_max,		/* RFC 4340, 10. */

  	},
  	{

  		.procname	= "tx_ccid",

  		.data		= &sysctl_dccp_tx_ccid,
  		.maxlen		= sizeof(sysctl_dccp_tx_ccid),

  		.mode		= 0644,

  		.proc_handler	= proc_dointvec_minmax,

  		.extra1		= SYSCTL_ZERO,

  		.extra2		= &u8_max,		/* RFC 4340, 10. */

  	},
  	{

  		.procname	= "request_retries",
  		.data		= &sysctl_dccp_request_retries,
  		.maxlen		= sizeof(sysctl_dccp_request_retries),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec_minmax,

  		.extra1		= SYSCTL_ONE,

  		.extra2		= &u8_max,

  	},
  	{

  		.procname	= "retries1",
  		.data		= &sysctl_dccp_retries1,
  		.maxlen		= sizeof(sysctl_dccp_retries1),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec_minmax,

  		.extra1		= SYSCTL_ZERO,

  		.extra2		= &u8_max,

  	},
  	{

  		.procname	= "retries2",
  		.data		= &sysctl_dccp_retries2,
  		.maxlen		= sizeof(sysctl_dccp_retries2),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec_minmax,

  		.extra1		= SYSCTL_ZERO,

  		.extra2		= &u8_max,

  	},

  	{

  		.procname	= "tx_qlen",
  		.data		= &sysctl_dccp_tx_qlen,
  		.maxlen		= sizeof(sysctl_dccp_tx_qlen),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec_minmax,

  		.extra1		= SYSCTL_ZERO,

  	},

  	{
  		.procname	= "sync_ratelimit",
  		.data		= &sysctl_dccp_sync_ratelimit,
  		.maxlen		= sizeof(sysctl_dccp_sync_ratelimit),
  		.mode		= 0644,
  		.proc_handler	= proc_dointvec_ms_jiffies,
  	},

  	{ }

  };

  static struct ctl_table_header *dccp_table_header;
  
  int __init dccp_sysctl_init(void)
  {

  	dccp_table_header = register_net_sysctl(&init_net, "net/dccp/default",

  			dccp_default_table);

  
  	return dccp_table_header != NULL ? 0 : -ENOMEM;
  }
  
  void dccp_sysctl_exit(void)
  {
  	if (dccp_table_header != NULL) {

  		unregister_net_sysctl_table(dccp_table_header);

  		dccp_table_header = NULL;
  	}
  }