[linux.git] / ipc / mq_sysctl.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Copyright (C) 2007 IBM Corporation
 *
 *  Author: Cedric Le Goater <[email protected]>
 */

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

#include <linux/stat.h>
#include <linux/capability.h>
#include <linux/slab.h>

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_dointvec,
	},
	{
		.procname	= "msg_max",
		.data		= &init_ipc_ns.mq_msg_max,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_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_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_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_dointvec_minmax,
		.extra1		= &msg_maxsize_limit_min,
		.extra2		= &msg_maxsize_limit_max,
	},
	{}
};

static struct ctl_table_set *set_lookup(struct ctl_table_root *root)
{
	return &current->nsproxy->ipc_ns->mq_set;
}

static int set_is_seen(struct ctl_table_set *set)
{
	return &current->nsproxy->ipc_ns->mq_set == set;
}

static struct ctl_table_root set_root = {
	.lookup = set_lookup,
};

bool setup_mq_sysctls(struct ipc_namespace *ns)
{
	struct ctl_table *tbl;

	setup_sysctl_set(&ns->mq_set, &set_root, set_is_seen);

	tbl = kmemdup(mq_sysctls, sizeof(mq_sysctls), GFP_KERNEL);
	if (tbl) {
		int i;

		for (i = 0; i < ARRAY_SIZE(mq_sysctls); i++) {
			if (tbl[i].data == &init_ipc_ns.mq_queues_max)
				tbl[i].data = &ns->mq_queues_max;

			else if (tbl[i].data == &init_ipc_ns.mq_msg_max)
				tbl[i].data = &ns->mq_msg_max;

			else if (tbl[i].data == &init_ipc_ns.mq_msgsize_max)
				tbl[i].data = &ns->mq_msgsize_max;

			else if (tbl[i].data == &init_ipc_ns.mq_msg_default)
				tbl[i].data = &ns->mq_msg_default;

			else if (tbl[i].data == &init_ipc_ns.mq_msgsize_default)
				tbl[i].data = &ns->mq_msgsize_default;
			else
				tbl[i].data = NULL;
		}

		ns->mq_sysctls = __register_sysctl_table(&ns->mq_set,
							 "fs/mqueue", tbl,
							 ARRAY_SIZE(mq_sysctls));
	}
	if (!ns->mq_sysctls) {
		kfree(tbl);
		retire_sysctl_set(&ns->mq_set);
		return false;
	}

	return true;
}

void retire_mq_sysctls(struct ipc_namespace *ns)
{
	struct ctl_table *tbl;

	tbl = ns->mq_sysctls->ctl_table_arg;
	unregister_sysctl_table(ns->mq_sysctls);
	retire_sysctl_set(&ns->mq_set);
	kfree(tbl);
}
Commit	Line	Data
b886d83c	1	// SPDX-License-Identifier: GPL-2.0-only
bdc8e5f8 SH	2	/*
	3	* Copyright (C) 2007 IBM Corporation
	4	*
	5	* Author: Cedric Le Goater <[email protected]>
bdc8e5f8 SH	6	*/
	7
	8	#include <linux/nsproxy.h>
	9	#include <linux/ipc_namespace.h>
	10	#include <linux/sysctl.h>
	11
dc55e35f AG	12	#include <linux/stat.h>
	13	#include <linux/capability.h>
	14	#include <linux/slab.h>
bdc8e5f8 SH	15
bdc8e5f8 SH	16	static int msg_max_limit_min = MIN_MSGMAX;
93e6f119	17	static int msg_max_limit_max = HARD_MSGMAX;
bdc8e5f8 SH	18
bdc8e5f8 SH	19	static int msg_maxsize_limit_min = MIN_MSGSIZEMAX;
93e6f119	20	static int msg_maxsize_limit_max = HARD_MSGSIZEMAX;
bdc8e5f8	21
a5c5928b	22	static struct ctl_table mq_sysctls[] = {
bdc8e5f8 SH	23	{
	24	.procname = "queues_max",
	25	.data = &init_ipc_ns.mq_queues_max,
	26	.maxlen = sizeof(int),
	27	.mode = 0644,
dc55e35f	28	.proc_handler = proc_dointvec,
bdc8e5f8 SH	29	},
	30	{
	31	.procname = "msg_max",
	32	.data = &init_ipc_ns.mq_msg_max,
	33	.maxlen = sizeof(int),
	34	.mode = 0644,
dc55e35f	35	.proc_handler = proc_dointvec_minmax,
bdc8e5f8 SH	36	.extra1 = &msg_max_limit_min,
	37	.extra2 = &msg_max_limit_max,
	38	},
	39	{
	40	.procname = "msgsize_max",
	41	.data = &init_ipc_ns.mq_msgsize_max,
	42	.maxlen = sizeof(int),
	43	.mode = 0644,
dc55e35f	44	.proc_handler = proc_dointvec_minmax,
bdc8e5f8 SH	45	.extra1 = &msg_maxsize_limit_min,
	46	.extra2 = &msg_maxsize_limit_max,
	47	},
cef0184c KM	48	{
	49	.procname = "msg_default",
	50	.data = &init_ipc_ns.mq_msg_default,
	51	.maxlen = sizeof(int),
	52	.mode = 0644,
dc55e35f	53	.proc_handler = proc_dointvec_minmax,
cef0184c KM	54	.extra1 = &msg_max_limit_min,
	55	.extra2 = &msg_max_limit_max,
	56	},
	57	{
	58	.procname = "msgsize_default",
	59	.data = &init_ipc_ns.mq_msgsize_default,
	60	.maxlen = sizeof(int),
	61	.mode = 0644,
dc55e35f	62	.proc_handler = proc_dointvec_minmax,
cef0184c KM	63	.extra1 = &msg_maxsize_limit_min,
	64	.extra2 = &msg_maxsize_limit_max,
	65	},
2bc4657c	66	{}
bdc8e5f8 SH	67	};
bdc8e5f8 SH	68
dc55e35f AG	69	static struct ctl_table_set set_lookup(struct ctl_table_root root)
	70	{
	71	return &current->nsproxy->ipc_ns->mq_set;
	72	}
bdc8e5f8	73
dc55e35f AG	74	static int set_is_seen(struct ctl_table_set *set)
	75	{
	76	return &current->nsproxy->ipc_ns->mq_set == set;
	77	}
	78
	79	static struct ctl_table_root set_root = {
	80	.lookup = set_lookup,
bdc8e5f8 SH	81	};
bdc8e5f8 SH	82
dc55e35f	83	bool setup_mq_sysctls(struct ipc_namespace *ns)
bdc8e5f8	84	{
dc55e35f AG	85	struct ctl_table *tbl;
	86
	87	setup_sysctl_set(&ns->mq_set, &set_root, set_is_seen);
	88
	89	tbl = kmemdup(mq_sysctls, sizeof(mq_sysctls), GFP_KERNEL);
	90	if (tbl) {
	91	int i;
	92
	93	for (i = 0; i < ARRAY_SIZE(mq_sysctls); i++) {
	94	if (tbl[i].data == &init_ipc_ns.mq_queues_max)
	95	tbl[i].data = &ns->mq_queues_max;
	96
	97	else if (tbl[i].data == &init_ipc_ns.mq_msg_max)
	98	tbl[i].data = &ns->mq_msg_max;
	99
	100	else if (tbl[i].data == &init_ipc_ns.mq_msgsize_max)
	101	tbl[i].data = &ns->mq_msgsize_max;
	102
	103	else if (tbl[i].data == &init_ipc_ns.mq_msg_default)
	104	tbl[i].data = &ns->mq_msg_default;
	105
	106	else if (tbl[i].data == &init_ipc_ns.mq_msgsize_default)
	107	tbl[i].data = &ns->mq_msgsize_default;
	108	else
	109	tbl[i].data = NULL;
	110	}
	111
bff97cf1 JG	112	ns->mq_sysctls = __register_sysctl_table(&ns->mq_set,
	113	"fs/mqueue", tbl,
	114	ARRAY_SIZE(mq_sysctls));
dc55e35f AG	115	}
	116	if (!ns->mq_sysctls) {
	117	kfree(tbl);
	118	retire_sysctl_set(&ns->mq_set);
	119	return false;
	120	}
	121
	122	return true;
	123	}
	124
	125	void retire_mq_sysctls(struct ipc_namespace *ns)
	126	{
	127	struct ctl_table *tbl;
	128
	129	tbl = ns->mq_sysctls->ctl_table_arg;
	130	unregister_sysctl_table(ns->mq_sysctls);
	131	retire_sysctl_set(&ns->mq_set);
	132	kfree(tbl);
bdc8e5f8	133	}