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
get_mq(struct ctl_table * table)17 static void *get_mq(struct 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
proc_mq_dointvec(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)25 static int proc_mq_dointvec(struct 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
proc_mq_dointvec_minmax(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)35 static int proc_mq_dointvec_minmax(struct 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
50 static int msg_max_limit_min = MIN_MSGMAX;
51 static int msg_max_limit_max = HARD_MSGMAX;
52
53 static int msg_maxsize_limit_min = MIN_MSGSIZEMAX;
54 static int msg_maxsize_limit_max = HARD_MSGSIZEMAX;
55
56 static struct 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
103 static struct ctl_table mq_sysctl_dir[] = {
104 {
105 .procname = "mqueue",
106 .mode = 0555,
107 .child = mq_sysctls,
108 },
109 {}
110 };
111
112 static struct ctl_table mq_sysctl_root[] = {
113 {
114 .procname = "fs",
115 .mode = 0555,
116 .child = mq_sysctl_dir,
117 },
118 {}
119 };
120
mq_register_sysctl_table(void)121 struct ctl_table_header *mq_register_sysctl_table(void)
122 {
123 return register_sysctl_table(mq_sysctl_root);
124 }
125