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

  /*
   *  Copyright (C) 2007 IBM Corporation
   *
   *  Author: Cedric Le Goater <clg@fr.ibm.com>

   */
  
  #include <linux/nsproxy.h>
  #include <linux/ipc_namespace.h>
  #include <linux/sysctl.h>

  #ifdef CONFIG_PROC_SYSCTL

  static void *get_mq(struct ctl_table *table)

  {
  	char *which = table->data;
  	struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
  	which = (which - (char *)&init_ipc_ns) + (char *)ipc_ns;
  	return which;
  }

  static int proc_mq_dointvec(struct ctl_table *table, int write,

  			    void *buffer, size_t *lenp, loff_t *ppos)

  {
  	struct ctl_table mq_table;
  	memcpy(&mq_table, table, sizeof(mq_table));
  	mq_table.data = get_mq(table);
  
  	return proc_dointvec(&mq_table, write, buffer, lenp, ppos);
  }

  static int proc_mq_dointvec_minmax(struct ctl_table *table, int write,

  		void *buffer, size_t *lenp, loff_t *ppos)

  {
  	struct ctl_table mq_table;
  	memcpy(&mq_table, table, sizeof(mq_table));
  	mq_table.data = get_mq(table);

  	return proc_dointvec_minmax(&mq_table, write, buffer,

  					lenp, ppos);
  }
  #else

  #define proc_mq_dointvec NULL

  #define proc_mq_dointvec_minmax NULL
  #endif
  
  static int msg_max_limit_min = MIN_MSGMAX;

  static int msg_max_limit_max = HARD_MSGMAX;

  
  static int msg_maxsize_limit_min = MIN_MSGSIZEMAX;

  static int msg_maxsize_limit_max = HARD_MSGSIZEMAX;

  static struct ctl_table mq_sysctls[] = {

  	{
  		.procname	= "queues_max",
  		.data		= &init_ipc_ns.mq_queues_max,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,

  		.proc_handler	= proc_mq_dointvec,

  	},
  	{
  		.procname	= "msg_max",
  		.data		= &init_ipc_ns.mq_msg_max,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,
  		.proc_handler	= proc_mq_dointvec_minmax,
  		.extra1		= &msg_max_limit_min,
  		.extra2		= &msg_max_limit_max,
  	},
  	{
  		.procname	= "msgsize_max",
  		.data		= &init_ipc_ns.mq_msgsize_max,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,
  		.proc_handler	= proc_mq_dointvec_minmax,
  		.extra1		= &msg_maxsize_limit_min,
  		.extra2		= &msg_maxsize_limit_max,
  	},

  	{
  		.procname	= "msg_default",
  		.data		= &init_ipc_ns.mq_msg_default,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,
  		.proc_handler	= proc_mq_dointvec_minmax,
  		.extra1		= &msg_max_limit_min,
  		.extra2		= &msg_max_limit_max,
  	},
  	{
  		.procname	= "msgsize_default",
  		.data		= &init_ipc_ns.mq_msgsize_default,
  		.maxlen		= sizeof(int),
  		.mode		= 0644,
  		.proc_handler	= proc_mq_dointvec_minmax,
  		.extra1		= &msg_maxsize_limit_min,
  		.extra2		= &msg_maxsize_limit_max,
  	},

  	{}

  };

  static struct ctl_table mq_sysctl_dir[] = {

  	{
  		.procname	= "mqueue",
  		.mode		= 0555,
  		.child		= mq_sysctls,
  	},

  	{}

  };

  static struct ctl_table mq_sysctl_root[] = {

  	{

  		.procname	= "fs",
  		.mode		= 0555,
  		.child		= mq_sysctl_dir,
  	},

  	{}

  };
  
  struct ctl_table_header *mq_register_sysctl_table(void)
  {
  	return register_sysctl_table(mq_sysctl_root);
  }