Root/ipc/mq_sysctl.c

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/*
17 * Define the ranges various user-specified maximum values can
18 * be set to.
19 */
20#define MIN_MSGMAX 1 /* min value for msg_max */
21#define MAX_MSGMAX HARD_MSGMAX /* max value for msg_max */
22#define MIN_MSGSIZEMAX 128 /* min value for msgsize_max */
23#define MAX_MSGSIZEMAX (8192*128) /* max value for msgsize_max */
24
25#ifdef CONFIG_PROC_SYSCTL
26static void *get_mq(ctl_table *table)
27{
28    char *which = table->data;
29    struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
30    which = (which - (char *)&init_ipc_ns) + (char *)ipc_ns;
31    return which;
32}
33
34static int proc_mq_dointvec(ctl_table *table, int write,
35    void __user *buffer, size_t *lenp, loff_t *ppos)
36{
37    struct ctl_table mq_table;
38    memcpy(&mq_table, table, sizeof(mq_table));
39    mq_table.data = get_mq(table);
40
41    return proc_dointvec(&mq_table, write, buffer, lenp, ppos);
42}
43
44static int proc_mq_dointvec_minmax(ctl_table *table, int write,
45    void __user *buffer, size_t *lenp, loff_t *ppos)
46{
47    struct ctl_table mq_table;
48    memcpy(&mq_table, table, sizeof(mq_table));
49    mq_table.data = get_mq(table);
50
51    return proc_dointvec_minmax(&mq_table, write, buffer,
52                    lenp, ppos);
53}
54#else
55#define proc_mq_dointvec NULL
56#define proc_mq_dointvec_minmax NULL
57#endif
58
59static int msg_max_limit_min = MIN_MSGMAX;
60static int msg_max_limit_max = MAX_MSGMAX;
61
62static int msg_maxsize_limit_min = MIN_MSGSIZEMAX;
63static int msg_maxsize_limit_max = MAX_MSGSIZEMAX;
64
65static ctl_table mq_sysctls[] = {
66    {
67        .procname = "queues_max",
68        .data = &init_ipc_ns.mq_queues_max,
69        .maxlen = sizeof(int),
70        .mode = 0644,
71        .proc_handler = proc_mq_dointvec,
72    },
73    {
74        .procname = "msg_max",
75        .data = &init_ipc_ns.mq_msg_max,
76        .maxlen = sizeof(int),
77        .mode = 0644,
78        .proc_handler = proc_mq_dointvec_minmax,
79        .extra1 = &msg_max_limit_min,
80        .extra2 = &msg_max_limit_max,
81    },
82    {
83        .procname = "msgsize_max",
84        .data = &init_ipc_ns.mq_msgsize_max,
85        .maxlen = sizeof(int),
86        .mode = 0644,
87        .proc_handler = proc_mq_dointvec_minmax,
88        .extra1 = &msg_maxsize_limit_min,
89        .extra2 = &msg_maxsize_limit_max,
90    },
91    {}
92};
93
94static ctl_table mq_sysctl_dir[] = {
95    {
96        .procname = "mqueue",
97        .mode = 0555,
98        .child = mq_sysctls,
99    },
100    {}
101};
102
103static ctl_table mq_sysctl_root[] = {
104    {
105        .procname = "fs",
106        .mode = 0555,
107        .child = mq_sysctl_dir,
108    },
109    {}
110};
111
112struct ctl_table_header *mq_register_sysctl_table(void)
113{
114    return register_sysctl_table(mq_sysctl_root);
115}
116

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