// 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 __user *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 __user *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);

}