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#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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