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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 | |
17 | static 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 | ||
25 | static 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 | ||
39 | static int msg_queues_limit_min = MIN_QUEUESMAX; | |
40 | static int msg_queues_limit_max = HARD_QUEUESMAX; | |
41 | ||
42 | static int msg_max_limit_min = MIN_MSGMAX; | |
43 | static int msg_max_limit_max = HARD_MSGMAX; | |
44 | ||
45 | static int msg_maxsize_limit_min = MIN_MSGSIZEMAX; | |
46 | static int msg_maxsize_limit_max = HARD_MSGSIZEMAX; | |
47 | ||
48 | static 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 | ||
97 | static ctl_table mq_sysctl_dir[] = { | |
98 | { | |
99 | .procname = "mqueue", | |
100 | .mode = 0555, | |
101 | .child = mq_sysctls, | |
102 | }, | |
103 | {} | |
104 | }; | |
105 | ||
106 | static ctl_table mq_sysctl_root[] = { | |
107 | { | |
108 | .procname = "fs", | |
109 | .mode = 0555, | |
110 | .child = mq_sysctl_dir, | |
111 | }, | |
112 | {} | |
113 | }; | |
114 | ||
115 | struct ctl_table_header *mq_register_sysctl_table(void) | |
116 | { | |
117 | return register_sysctl_table(mq_sysctl_root); | |
118 | } |