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(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(&mq_table, write, buffer, lenp, ppos);
33}
34
35static int proc_mq_dointvec_minmax(ctl_table *table, int write,
36    void __user *buffer, size_t *lenp, loff_t *ppos)
37{
38    struct ctl_table mq_table;
39    memcpy(&mq_table, table, sizeof(mq_table));
40    mq_table.data = get_mq(table);
41
42    return proc_dointvec_minmax(&mq_table, write, buffer,
43                    lenp, ppos);
44}
45#else
46#define proc_mq_dointvec NULL
47#define proc_mq_dointvec_minmax NULL
48#endif
49
50static int msg_max_limit_min = MIN_MSGMAX;
51static int msg_max_limit_max = HARD_MSGMAX;
52
53static int msg_maxsize_limit_min = MIN_MSGSIZEMAX;
54static int msg_maxsize_limit_max = HARD_MSGSIZEMAX;
55
56static ctl_table mq_sysctls[] = {
57    {
58        .procname = "queues_max",
59        .data = &init_ipc_ns.mq_queues_max,
60        .maxlen = sizeof(int),
61        .mode = 0644,
62        .proc_handler = proc_mq_dointvec,
63    },
64    {
65        .procname = "msg_max",
66        .data = &init_ipc_ns.mq_msg_max,
67        .maxlen = sizeof(int),
68        .mode = 0644,
69        .proc_handler = proc_mq_dointvec_minmax,
70        .extra1 = &msg_max_limit_min,
71        .extra2 = &msg_max_limit_max,
72    },
73    {
74        .procname = "msgsize_max",
75        .data = &init_ipc_ns.mq_msgsize_max,
76        .maxlen = sizeof(int),
77        .mode = 0644,
78        .proc_handler = proc_mq_dointvec_minmax,
79        .extra1 = &msg_maxsize_limit_min,
80        .extra2 = &msg_maxsize_limit_max,
81    },
82    {
83        .procname = "msg_default",
84        .data = &init_ipc_ns.mq_msg_default,
85        .maxlen = sizeof(int),
86        .mode = 0644,
87        .proc_handler = proc_mq_dointvec_minmax,
88        .extra1 = &msg_max_limit_min,
89        .extra2 = &msg_max_limit_max,
90    },
91    {
92        .procname = "msgsize_default",
93        .data = &init_ipc_ns.mq_msgsize_default,
94        .maxlen = sizeof(int),
95        .mode = 0644,
96        .proc_handler = proc_mq_dointvec_minmax,
97        .extra1 = &msg_maxsize_limit_min,
98        .extra2 = &msg_maxsize_limit_max,
99    },
100    {}
101};
102
103static ctl_table mq_sysctl_dir[] = {
104    {
105        .procname = "mqueue",
106        .mode = 0555,
107        .child = mq_sysctls,
108    },
109    {}
110};
111
112static ctl_table mq_sysctl_root[] = {
113    {
114        .procname = "fs",
115        .mode = 0555,
116        .child = mq_sysctl_dir,
117    },
118    {}
119};
120
121struct ctl_table_header *mq_register_sysctl_table(void)
122{
123    return register_sysctl_table(mq_sysctl_root);
124}
125

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