linux/ipc/mq_sysctl.c
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   1/*
   2 *  Copyright (C) 2007 IBM Corporation
   3 *
   4 *  Author: Cedric Le Goater <clg@fr.ibm.com>
   5 *
   6 *  This program is free software; you can redistribute it and/or
   7 *  modify it under the terms of the GNU General Public License as
   8 *  published by the Free Software Foundation, version 2 of the
   9 *  License.
  10 */
  11
  12#include <linux/nsproxy.h>
  13#include <linux/ipc_namespace.h>
  14#include <linux/sysctl.h>
  15
  16#ifdef CONFIG_PROC_SYSCTL
  17static void *get_mq(ctl_table *table)
  18{
  19        char *which = table->data;
  20        struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
  21        which = (which - (char *)&init_ipc_ns) + (char *)ipc_ns;
  22        return which;
  23}
  24
  25static int proc_mq_dointvec_minmax(ctl_table *table, int write,
  26        void __user *buffer, size_t *lenp, loff_t *ppos)
  27{
  28        struct ctl_table mq_table;
  29        memcpy(&mq_table, table, sizeof(mq_table));
  30        mq_table.data = get_mq(table);
  31
  32        return proc_dointvec_minmax(&mq_table, write, buffer,
  33                                        lenp, ppos);
  34}
  35#else
  36#define proc_mq_dointvec_minmax NULL
  37#endif
  38
  39static int msg_queues_limit_min = MIN_QUEUESMAX;
  40static int msg_queues_limit_max = HARD_QUEUESMAX;
  41
  42static int msg_max_limit_min = MIN_MSGMAX;
  43static int msg_max_limit_max = HARD_MSGMAX;
  44
  45static int msg_maxsize_limit_min = MIN_MSGSIZEMAX;
  46static int msg_maxsize_limit_max = HARD_MSGSIZEMAX;
  47
  48static ctl_table mq_sysctls[] = {
  49        {
  50                .procname       = "queues_max",
  51                .data           = &init_ipc_ns.mq_queues_max,
  52                .maxlen         = sizeof(int),
  53                .mode           = 0644,
  54                .proc_handler   = proc_mq_dointvec_minmax,
  55                .extra1         = &msg_queues_limit_min,
  56                .extra2         = &msg_queues_limit_max,
  57        },
  58        {
  59                .procname       = "msg_max",
  60                .data           = &init_ipc_ns.mq_msg_max,
  61                .maxlen         = sizeof(int),
  62                .mode           = 0644,
  63                .proc_handler   = proc_mq_dointvec_minmax,
  64                .extra1         = &msg_max_limit_min,
  65                .extra2         = &msg_max_limit_max,
  66        },
  67        {
  68                .procname       = "msgsize_max",
  69                .data           = &init_ipc_ns.mq_msgsize_max,
  70                .maxlen         = sizeof(int),
  71                .mode           = 0644,
  72                .proc_handler   = proc_mq_dointvec_minmax,
  73                .extra1         = &msg_maxsize_limit_min,
  74                .extra2         = &msg_maxsize_limit_max,
  75        },
  76        {
  77                .procname       = "msg_default",
  78                .data           = &init_ipc_ns.mq_msg_default,
  79                .maxlen         = sizeof(int),
  80                .mode           = 0644,
  81                .proc_handler   = proc_mq_dointvec_minmax,
  82                .extra1         = &msg_max_limit_min,
  83                .extra2         = &msg_max_limit_max,
  84        },
  85        {
  86                .procname       = "msgsize_default",
  87                .data           = &init_ipc_ns.mq_msgsize_default,
  88                .maxlen         = sizeof(int),
  89                .mode           = 0644,
  90                .proc_handler   = proc_mq_dointvec_minmax,
  91                .extra1         = &msg_maxsize_limit_min,
  92                .extra2         = &msg_maxsize_limit_max,
  93        },
  94        {}
  95};
  96
  97static ctl_table mq_sysctl_dir[] = {
  98        {
  99                .procname       = "mqueue",
 100                .mode           = 0555,
 101                .child          = mq_sysctls,
 102        },
 103        {}
 104};
 105
 106static ctl_table mq_sysctl_root[] = {
 107        {
 108                .procname       = "fs",
 109                .mode           = 0555,
 110                .child          = mq_sysctl_dir,
 111        },
 112        {}
 113};
 114
 115struct ctl_table_header *mq_register_sysctl_table(void)
 116{
 117        return register_sysctl_table(mq_sysctl_root);
 118}
 119
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