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