// 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_SYSCTLstatic 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);}