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(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 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 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 }; 120 121 struct ctl_table_header *mq_register_sysctl_table(void) 122 { 123 return register_sysctl_table(mq_sysctl_root); 124 } 125