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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 | /* |
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 |
26 | static 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 | |
34 | static 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 | |
44 | static 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 | |
59 | static int msg_max_limit_min = MIN_MSGMAX; |
60 | static int msg_max_limit_max = MAX_MSGMAX; |
61 | |
62 | static int msg_maxsize_limit_min = MIN_MSGSIZEMAX; |
63 | static int msg_maxsize_limit_max = MAX_MSGSIZEMAX; |
64 | |
65 | static 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 | |
94 | static ctl_table mq_sysctl_dir[] = { |
95 | { |
96 | .procname = "mqueue", |
97 | .mode = 0555, |
98 | .child = mq_sysctls, |
99 | }, |
100 | {} |
101 | }; |
102 | |
103 | static ctl_table mq_sysctl_root[] = { |
104 | { |
105 | .procname = "fs", |
106 | .mode = 0555, |
107 | .child = mq_sysctl_dir, |
108 | }, |
109 | {} |
110 | }; |
111 | |
112 | struct ctl_table_header *mq_register_sysctl_table(void) |
113 | { |
114 | return register_sysctl_table(mq_sysctl_root); |
115 | } |
116 |
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