1 | /*- |
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2 | * Copyright (c) 1982, 1986, 1989, 1993 |
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3 | * The Regents of the University of California. All rights reserved. |
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4 | * |
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5 | * This code is derived from software contributed to Berkeley by |
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6 | * Mike Karels at Berkeley Software Design, Inc. |
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7 | * |
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8 | * Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD |
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9 | * project, to make these variables more userfriendly. |
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10 | * |
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11 | * Redistribution and use in source and binary forms, with or without |
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12 | * modification, are permitted provided that the following conditions |
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13 | * are met: |
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14 | * 1. Redistributions of source code must retain the above copyright |
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15 | * notice, this list of conditions and the following disclaimer. |
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16 | * 2. Redistributions in binary form must reproduce the above copyright |
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17 | * notice, this list of conditions and the following disclaimer in the |
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18 | * documentation and/or other materials provided with the distribution. |
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19 | * 4. Neither the name of the University nor the names of its contributors |
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20 | * may be used to endorse or promote products derived from this software |
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21 | * without specific prior written permission. |
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22 | * |
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23 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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33 | * SUCH DAMAGE. |
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34 | * |
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35 | * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94 |
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36 | * $FreeBSD: src/sys/kern/kern_sysctl.c,v 1.135 2002/10/27 07:12:34 rwatson Exp $ |
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37 | */ |
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38 | |
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39 | #ifndef __rtems__ |
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40 | #include "opt_compat.h" |
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41 | #include "opt_mac.h" |
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42 | #endif |
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43 | |
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44 | #include <sys/param.h> |
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45 | #include <sys/systm.h> |
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46 | #include <sys/kernel.h> |
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47 | #include <sys/sysctl.h> |
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48 | #include <sys/malloc.h> |
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49 | #include <sys/proc.h> |
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50 | #ifndef __rtems__ |
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51 | #include <sys/mac.h> |
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52 | #include <sys/lock.h> |
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53 | #include <sys/mutex.h> |
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54 | #include <sys/sx.h> |
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55 | #include <sys/sysproto.h> |
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56 | #else |
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57 | #include <sys/buf.h> |
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58 | |
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59 | #include <stdio.h> /* for snprintf() */ |
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60 | size_t strlcpy(char *, const char *, size_t); |
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61 | #endif |
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62 | #include <vm/vm.h> |
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63 | #include <vm/vm_extern.h> |
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64 | |
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65 | #ifndef __rtems__ |
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66 | static MALLOC_DEFINE(M_SYSCTL, "sysctl", "sysctl internal magic"); |
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67 | static MALLOC_DEFINE(M_SYSCTLOID, "sysctloid", "sysctl dynamic oids"); |
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68 | static MALLOC_DEFINE(M_SYSCTLTMP, "sysctltmp", "sysctl temp output buffer"); |
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69 | #else |
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70 | /* |
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71 | * Currently these mean nothing on RTEMS. |
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72 | */ |
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73 | #define M_SYSCTLOID 1 |
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74 | #define M_SYSCTLTMP 2 |
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75 | #define M_ZERO 0 |
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76 | |
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77 | typedef unsigned long *uintptr_t; |
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78 | |
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79 | #define mtx_lock(l) |
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80 | #define mtx_unlock(l) |
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81 | |
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82 | #endif |
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83 | |
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84 | #ifndef __rtems__ |
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85 | /* |
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86 | * Locking - this locks the sysctl tree in memory. |
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87 | */ |
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88 | static struct sx sysctllock; |
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89 | #endif |
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90 | |
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91 | #ifdef __rtems__ |
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92 | #define SYSCTL_LOCK() |
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93 | #define SYSCTL_UNLOCK() |
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94 | #define SYSCTL_INIT() |
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95 | #else |
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96 | #define SYSCTL_LOCK() sx_xlock(&sysctllock) |
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97 | #define SYSCTL_UNLOCK() sx_xunlock(&sysctllock) |
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98 | #define SYSCTL_INIT() sx_init(&sysctllock, "sysctl lock") |
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99 | #endif |
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100 | |
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101 | static int sysctl_root(SYSCTL_HANDLER_ARGS); |
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102 | |
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103 | struct sysctl_oid_list sysctl__children; /* root list */ |
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104 | |
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105 | static struct sysctl_oid * |
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106 | sysctl_find_oidname(const char *name, struct sysctl_oid_list *list) |
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107 | { |
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108 | struct sysctl_oid *oidp; |
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109 | |
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110 | SLIST_FOREACH(oidp, list, oid_link) { |
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111 | if (strcmp(oidp->oid_name, name) == 0) { |
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112 | return (oidp); |
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113 | } |
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114 | } |
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115 | return (NULL); |
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116 | } |
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117 | |
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118 | /* |
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119 | * Initialization of the MIB tree. |
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120 | * |
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121 | * Order by number in each list. |
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122 | */ |
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123 | |
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124 | void |
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125 | sysctl_register_oid(struct sysctl_oid *oidp) |
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126 | { |
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127 | struct sysctl_oid_list *parent = oidp->oid_parent; |
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128 | struct sysctl_oid *p; |
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129 | struct sysctl_oid *q; |
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130 | |
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131 | /* |
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132 | * First check if another oid with the same name already |
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133 | * exists in the parent's list. |
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134 | */ |
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135 | p = sysctl_find_oidname(oidp->oid_name, parent); |
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136 | if (p != NULL) { |
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137 | if ((p->oid_kind & CTLTYPE) == CTLTYPE_NODE) { |
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138 | p->oid_refcnt++; |
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139 | return; |
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140 | } else { |
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141 | printf("can't re-use a leaf (%s)!\n", p->oid_name); |
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142 | return; |
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143 | } |
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144 | } |
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145 | /* |
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146 | * If this oid has a number OID_AUTO, give it a number which |
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147 | * is greater than any current oid. |
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148 | * NOTE: DO NOT change the starting value here, change it in |
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149 | * <sys/sysctl.h>, and make sure it is at least 256 to |
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150 | * accomodate e.g. net.inet.raw as a static sysctl node. |
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151 | */ |
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152 | if (oidp->oid_number == OID_AUTO) { |
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153 | static int newoid = CTL_AUTO_START; |
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154 | |
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155 | oidp->oid_number = newoid++; |
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156 | if (newoid == 0x7fffffff) |
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157 | panic("out of oids"); |
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158 | } |
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159 | #if 0 |
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160 | else if (oidp->oid_number >= CTL_AUTO_START) { |
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161 | /* do not panic; this happens when unregistering sysctl sets */ |
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162 | printf("static sysctl oid too high: %d", oidp->oid_number); |
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163 | } |
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164 | #endif |
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165 | |
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166 | /* |
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167 | * Insert the oid into the parent's list in order. |
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168 | */ |
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169 | q = NULL; |
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170 | SLIST_FOREACH(p, parent, oid_link) { |
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171 | if (oidp->oid_number < p->oid_number) |
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172 | break; |
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173 | q = p; |
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174 | } |
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175 | if (q) |
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176 | SLIST_INSERT_AFTER(q, oidp, oid_link); |
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177 | else |
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178 | SLIST_INSERT_HEAD(parent, oidp, oid_link); |
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179 | } |
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180 | |
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181 | void |
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182 | sysctl_unregister_oid(struct sysctl_oid *oidp) |
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183 | { |
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184 | SLIST_REMOVE(oidp->oid_parent, oidp, sysctl_oid, oid_link); |
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185 | } |
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186 | |
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187 | /* Initialize a new context to keep track of dynamically added sysctls. */ |
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188 | int |
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189 | sysctl_ctx_init(struct sysctl_ctx_list *c) |
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190 | { |
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191 | |
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192 | if (c == NULL) { |
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193 | return (EINVAL); |
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194 | } |
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195 | TAILQ_INIT(c); |
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196 | return (0); |
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197 | } |
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198 | |
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199 | /* Free the context, and destroy all dynamic oids registered in this context */ |
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200 | int |
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201 | sysctl_ctx_free(struct sysctl_ctx_list *clist) |
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202 | { |
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203 | struct sysctl_ctx_entry *e, *e1; |
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204 | int error; |
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205 | |
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206 | error = 0; |
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207 | /* |
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208 | * First perform a "dry run" to check if it's ok to remove oids. |
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209 | * XXX FIXME |
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210 | * XXX This algorithm is a hack. But I don't know any |
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211 | * XXX better solution for now... |
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212 | */ |
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213 | TAILQ_FOREACH(e, clist, link) { |
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214 | error = sysctl_remove_oid(e->entry, 0, 0); |
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215 | if (error) |
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216 | break; |
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217 | } |
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218 | /* |
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219 | * Restore deregistered entries, either from the end, |
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220 | * or from the place where error occured. |
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221 | * e contains the entry that was not unregistered |
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222 | */ |
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223 | if (error) |
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224 | e1 = TAILQ_PREV(e, sysctl_ctx_list, link); |
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225 | else |
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226 | e1 = TAILQ_LAST(clist, sysctl_ctx_list); |
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227 | while (e1 != NULL) { |
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228 | sysctl_register_oid(e1->entry); |
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229 | e1 = TAILQ_PREV(e1, sysctl_ctx_list, link); |
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230 | } |
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231 | if (error) |
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232 | return(EBUSY); |
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233 | /* Now really delete the entries */ |
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234 | e = TAILQ_FIRST(clist); |
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235 | while (e != NULL) { |
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236 | e1 = TAILQ_NEXT(e, link); |
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237 | error = sysctl_remove_oid(e->entry, 1, 0); |
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238 | if (error) |
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239 | panic("sysctl_remove_oid: corrupt tree, entry: %s", |
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240 | e->entry->oid_name); |
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241 | free(e, M_SYSCTLOID); |
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242 | e = e1; |
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243 | } |
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244 | return (error); |
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245 | } |
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246 | |
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247 | /* Add an entry to the context */ |
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248 | struct sysctl_ctx_entry * |
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249 | sysctl_ctx_entry_add(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) |
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250 | { |
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251 | struct sysctl_ctx_entry *e; |
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252 | |
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253 | if (clist == NULL || oidp == NULL) |
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254 | return(NULL); |
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255 | e = malloc(sizeof(struct sysctl_ctx_entry), M_SYSCTLOID, M_WAITOK); |
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256 | e->entry = oidp; |
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257 | TAILQ_INSERT_HEAD(clist, e, link); |
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258 | return (e); |
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259 | } |
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260 | |
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261 | /* Find an entry in the context */ |
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262 | struct sysctl_ctx_entry * |
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263 | sysctl_ctx_entry_find(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) |
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264 | { |
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265 | struct sysctl_ctx_entry *e; |
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266 | |
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267 | if (clist == NULL || oidp == NULL) |
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268 | return(NULL); |
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269 | TAILQ_FOREACH(e, clist, link) { |
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270 | if(e->entry == oidp) |
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271 | return(e); |
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272 | } |
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273 | return (e); |
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274 | } |
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275 | |
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276 | /* |
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277 | * Delete an entry from the context. |
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278 | * NOTE: this function doesn't free oidp! You have to remove it |
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279 | * with sysctl_remove_oid(). |
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280 | */ |
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281 | int |
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282 | sysctl_ctx_entry_del(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) |
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283 | { |
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284 | struct sysctl_ctx_entry *e; |
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285 | |
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286 | if (clist == NULL || oidp == NULL) |
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287 | return (EINVAL); |
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288 | e = sysctl_ctx_entry_find(clist, oidp); |
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289 | if (e != NULL) { |
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290 | TAILQ_REMOVE(clist, e, link); |
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291 | free(e, M_SYSCTLOID); |
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292 | return (0); |
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293 | } else |
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294 | return (ENOENT); |
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295 | } |
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296 | |
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297 | /* |
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298 | * Remove dynamically created sysctl trees. |
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299 | * oidp - top of the tree to be removed |
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300 | * del - if 0 - just deregister, otherwise free up entries as well |
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301 | * recurse - if != 0 traverse the subtree to be deleted |
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302 | */ |
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303 | int |
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304 | sysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse) |
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305 | { |
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306 | struct sysctl_oid *p; |
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307 | int error; |
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308 | |
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309 | if (oidp == NULL) |
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310 | return(EINVAL); |
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311 | if ((oidp->oid_kind & CTLFLAG_DYN) == 0) { |
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312 | printf("can't remove non-dynamic nodes!\n"); |
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313 | return (EINVAL); |
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314 | } |
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315 | /* |
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316 | * WARNING: normal method to do this should be through |
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317 | * sysctl_ctx_free(). Use recursing as the last resort |
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318 | * method to purge your sysctl tree of leftovers... |
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319 | * However, if some other code still references these nodes, |
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320 | * it will panic. |
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321 | */ |
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322 | if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { |
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323 | if (oidp->oid_refcnt == 1) { |
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324 | SLIST_FOREACH(p, SYSCTL_CHILDREN(oidp), oid_link) { |
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325 | if (!recurse) |
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326 | return (ENOTEMPTY); |
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327 | error = sysctl_remove_oid(p, del, recurse); |
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328 | if (error) |
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329 | return (error); |
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330 | } |
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331 | if (del) |
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332 | free(SYSCTL_CHILDREN(oidp), M_SYSCTLOID); |
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333 | } |
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334 | } |
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335 | if (oidp->oid_refcnt > 1 ) { |
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336 | oidp->oid_refcnt--; |
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337 | } else { |
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338 | if (oidp->oid_refcnt == 0) { |
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339 | printf("Warning: bad oid_refcnt=%u (%s)!\n", |
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340 | oidp->oid_refcnt, oidp->oid_name); |
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341 | return (EINVAL); |
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342 | } |
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343 | sysctl_unregister_oid(oidp); |
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344 | if (del) { |
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345 | if (oidp->descr) |
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346 | free((void *)(uintptr_t)(const void *)oidp->descr, M_SYSCTLOID); |
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347 | free((void *)(uintptr_t)(const void *)oidp->oid_name, |
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348 | M_SYSCTLOID); |
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349 | free(oidp, M_SYSCTLOID); |
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350 | } |
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351 | } |
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352 | return (0); |
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353 | } |
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354 | |
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355 | /* |
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356 | * Create new sysctls at run time. |
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357 | * clist may point to a valid context initialized with sysctl_ctx_init(). |
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358 | */ |
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359 | struct sysctl_oid * |
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360 | sysctl_add_oid(struct sysctl_ctx_list *clist, struct sysctl_oid_list *parent, |
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361 | int number, const char *name, int kind, void *arg1, int arg2, |
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362 | int (*handler)(SYSCTL_HANDLER_ARGS), const char *fmt, const char *descr) |
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363 | { |
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364 | struct sysctl_oid *oidp; |
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365 | ssize_t len; |
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366 | char *newname; |
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367 | |
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368 | /* You have to hook up somewhere.. */ |
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369 | if (parent == NULL) |
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370 | return(NULL); |
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371 | /* Check if the node already exists, otherwise create it */ |
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372 | oidp = sysctl_find_oidname(name, parent); |
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373 | if (oidp != NULL) { |
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374 | if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { |
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375 | oidp->oid_refcnt++; |
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376 | /* Update the context */ |
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377 | if (clist != NULL) |
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378 | sysctl_ctx_entry_add(clist, oidp); |
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379 | return (oidp); |
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380 | } else { |
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381 | printf("can't re-use a leaf (%s)!\n", name); |
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382 | return (NULL); |
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383 | } |
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384 | } |
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385 | oidp = malloc(sizeof(struct sysctl_oid), M_SYSCTLOID, M_WAITOK|M_ZERO); |
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386 | oidp->oid_parent = parent; |
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387 | SLIST_NEXT(oidp, oid_link) = NULL; |
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388 | oidp->oid_number = number; |
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389 | oidp->oid_refcnt = 1; |
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390 | len = strlen(name); |
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391 | newname = malloc(len + 1, M_SYSCTLOID, M_WAITOK); |
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392 | bcopy(name, newname, len + 1); |
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393 | newname[len] = '\0'; |
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394 | oidp->oid_name = newname; |
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395 | oidp->oid_handler = handler; |
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396 | oidp->oid_kind = CTLFLAG_DYN | kind; |
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397 | if ((kind & CTLTYPE) == CTLTYPE_NODE) { |
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398 | /* Allocate space for children */ |
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399 | SYSCTL_CHILDREN(oidp) = malloc(sizeof(struct sysctl_oid_list), |
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400 | M_SYSCTLOID, M_WAITOK); |
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401 | SLIST_INIT(SYSCTL_CHILDREN(oidp)); |
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402 | } else { |
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403 | oidp->oid_arg1 = arg1; |
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404 | oidp->oid_arg2 = arg2; |
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405 | } |
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406 | oidp->oid_fmt = fmt; |
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407 | if (descr) { |
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408 | int len = strlen(descr) + 1; |
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409 | oidp->descr = malloc(len, M_SYSCTLOID, M_WAITOK); |
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410 | if (oidp->descr) |
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411 | strcpy((char *)(uintptr_t)(const void *)oidp->descr, descr); |
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412 | } |
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413 | /* Update the context, if used */ |
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414 | if (clist != NULL) |
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415 | sysctl_ctx_entry_add(clist, oidp); |
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416 | /* Register this oid */ |
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417 | sysctl_register_oid(oidp); |
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418 | return (oidp); |
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419 | } |
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420 | |
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421 | /* |
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422 | * Register the kernel's oids on startup. |
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423 | */ |
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424 | SET_DECLARE(sysctl_set, struct sysctl_oid); |
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425 | |
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426 | #if defined(__rtems__) |
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427 | void |
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428 | #else |
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429 | static void |
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430 | #endif |
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431 | sysctl_register_all(void *arg) |
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432 | { |
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433 | struct sysctl_oid **oidp; |
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434 | |
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435 | SYSCTL_INIT(); |
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436 | SET_FOREACH(oidp, sysctl_set) |
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437 | sysctl_register_oid(*oidp); |
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438 | } |
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439 | SYSINIT(sysctl, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_register_all, 0); |
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440 | |
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441 | /* |
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442 | * "Staff-functions" |
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443 | * |
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444 | * These functions implement a presently undocumented interface |
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445 | * used by the sysctl program to walk the tree, and get the type |
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446 | * so it can print the value. |
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447 | * This interface is under work and consideration, and should probably |
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448 | * be killed with a big axe by the first person who can find the time. |
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449 | * (be aware though, that the proper interface isn't as obvious as it |
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450 | * may seem, there are various conflicting requirements. |
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451 | * |
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452 | * {0,0} printf the entire MIB-tree. |
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453 | * {0,1,...} return the name of the "..." OID. |
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454 | * {0,2,...} return the next OID. |
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455 | * {0,3} return the OID of the name in "new" |
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456 | * {0,4,...} return the kind & format info for the "..." OID. |
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457 | * {0,5,...} return the description the "..." OID. |
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458 | */ |
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459 | |
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460 | static void |
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461 | sysctl_sysctl_debug_dump_node(struct sysctl_oid_list *l, int i) |
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462 | { |
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463 | int k; |
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464 | struct sysctl_oid *oidp; |
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465 | |
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466 | SLIST_FOREACH(oidp, l, oid_link) { |
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467 | |
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468 | for (k=0; k<i; k++) |
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469 | printf(" "); |
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470 | |
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471 | printf("%d %s ", oidp->oid_number, oidp->oid_name); |
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472 | |
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473 | printf("%c%c", |
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474 | oidp->oid_kind & CTLFLAG_RD ? 'R':' ', |
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475 | oidp->oid_kind & CTLFLAG_WR ? 'W':' '); |
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476 | |
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477 | if (oidp->oid_handler) |
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478 | printf(" *Handler"); |
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479 | |
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480 | switch (oidp->oid_kind & CTLTYPE) { |
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481 | case CTLTYPE_NODE: |
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482 | printf(" Node\n"); |
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483 | if (!oidp->oid_handler) { |
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484 | sysctl_sysctl_debug_dump_node( |
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485 | oidp->oid_arg1, i+2); |
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486 | } |
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487 | break; |
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488 | case CTLTYPE_INT: printf(" Int\n"); break; |
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489 | case CTLTYPE_STRING: printf(" String\n"); break; |
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490 | case CTLTYPE_QUAD: printf(" Quad\n"); break; |
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491 | case CTLTYPE_OPAQUE: printf(" Opaque/struct\n"); break; |
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492 | default: printf("\n"); |
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493 | } |
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494 | |
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495 | } |
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496 | } |
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497 | |
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498 | static int |
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499 | sysctl_sysctl_debug(SYSCTL_HANDLER_ARGS) |
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500 | { |
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501 | #ifndef __rtems__ |
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502 | int error; |
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503 | |
---|
504 | error = suser(req->td); |
---|
505 | if (error) |
---|
506 | return error; |
---|
507 | #endif |
---|
508 | sysctl_sysctl_debug_dump_node(&sysctl__children, 0); |
---|
509 | return ENOENT; |
---|
510 | } |
---|
511 | |
---|
512 | SYSCTL_PROC(_sysctl, 0, debug, CTLTYPE_STRING|CTLFLAG_RD, |
---|
513 | 0, 0, sysctl_sysctl_debug, "-", ""); |
---|
514 | |
---|
515 | static int |
---|
516 | sysctl_sysctl_name(SYSCTL_HANDLER_ARGS) |
---|
517 | { |
---|
518 | int *name = (int *) arg1; |
---|
519 | u_int namelen = arg2; |
---|
520 | int error = 0; |
---|
521 | struct sysctl_oid *oid; |
---|
522 | struct sysctl_oid_list *lsp = &sysctl__children, *lsp2; |
---|
523 | char buf[10]; |
---|
524 | |
---|
525 | while (namelen) { |
---|
526 | if (!lsp) { |
---|
527 | snprintf(buf,sizeof(buf),"%d",*name); |
---|
528 | if (req->oldidx) |
---|
529 | error = SYSCTL_OUT(req, ".", 1); |
---|
530 | if (!error) |
---|
531 | error = SYSCTL_OUT(req, buf, strlen(buf)); |
---|
532 | if (error) |
---|
533 | return (error); |
---|
534 | namelen--; |
---|
535 | name++; |
---|
536 | continue; |
---|
537 | } |
---|
538 | lsp2 = 0; |
---|
539 | SLIST_FOREACH(oid, lsp, oid_link) { |
---|
540 | if (oid->oid_number != *name) |
---|
541 | continue; |
---|
542 | |
---|
543 | if (req->oldidx) |
---|
544 | error = SYSCTL_OUT(req, ".", 1); |
---|
545 | if (!error) |
---|
546 | error = SYSCTL_OUT(req, oid->oid_name, |
---|
547 | strlen(oid->oid_name)); |
---|
548 | if (error) |
---|
549 | return (error); |
---|
550 | |
---|
551 | namelen--; |
---|
552 | name++; |
---|
553 | |
---|
554 | if ((oid->oid_kind & CTLTYPE) != CTLTYPE_NODE) |
---|
555 | break; |
---|
556 | |
---|
557 | if (oid->oid_handler) |
---|
558 | break; |
---|
559 | |
---|
560 | lsp2 = (struct sysctl_oid_list *)oid->oid_arg1; |
---|
561 | break; |
---|
562 | } |
---|
563 | lsp = lsp2; |
---|
564 | } |
---|
565 | return (SYSCTL_OUT(req, "", 1)); |
---|
566 | } |
---|
567 | |
---|
568 | SYSCTL_NODE(_sysctl, 1, name, CTLFLAG_RD, sysctl_sysctl_name, ""); |
---|
569 | |
---|
570 | static int |
---|
571 | sysctl_sysctl_next_ls(struct sysctl_oid_list *lsp, int *name, u_int namelen, |
---|
572 | int *next, int *len, int level, struct sysctl_oid **oidpp) |
---|
573 | { |
---|
574 | struct sysctl_oid *oidp; |
---|
575 | |
---|
576 | *len = level; |
---|
577 | SLIST_FOREACH(oidp, lsp, oid_link) { |
---|
578 | *next = oidp->oid_number; |
---|
579 | *oidpp = oidp; |
---|
580 | |
---|
581 | if (oidp->oid_kind & CTLFLAG_SKIP) |
---|
582 | continue; |
---|
583 | |
---|
584 | if (!namelen) { |
---|
585 | if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) |
---|
586 | return 0; |
---|
587 | if (oidp->oid_handler) |
---|
588 | /* We really should call the handler here...*/ |
---|
589 | return 0; |
---|
590 | lsp = (struct sysctl_oid_list *)oidp->oid_arg1; |
---|
591 | if (!sysctl_sysctl_next_ls(lsp, 0, 0, next+1, |
---|
592 | len, level+1, oidpp)) |
---|
593 | return 0; |
---|
594 | goto emptynode; |
---|
595 | } |
---|
596 | |
---|
597 | if (oidp->oid_number < *name) |
---|
598 | continue; |
---|
599 | |
---|
600 | if (oidp->oid_number > *name) { |
---|
601 | if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) |
---|
602 | return 0; |
---|
603 | if (oidp->oid_handler) |
---|
604 | return 0; |
---|
605 | lsp = (struct sysctl_oid_list *)oidp->oid_arg1; |
---|
606 | if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, |
---|
607 | next+1, len, level+1, oidpp)) |
---|
608 | return (0); |
---|
609 | goto next; |
---|
610 | } |
---|
611 | if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) |
---|
612 | continue; |
---|
613 | |
---|
614 | if (oidp->oid_handler) |
---|
615 | continue; |
---|
616 | |
---|
617 | lsp = (struct sysctl_oid_list *)oidp->oid_arg1; |
---|
618 | if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, next+1, |
---|
619 | len, level+1, oidpp)) |
---|
620 | return (0); |
---|
621 | next: |
---|
622 | namelen = 1; |
---|
623 | emptynode: |
---|
624 | *len = level; |
---|
625 | } |
---|
626 | return 1; |
---|
627 | } |
---|
628 | |
---|
629 | static int |
---|
630 | sysctl_sysctl_next(SYSCTL_HANDLER_ARGS) |
---|
631 | { |
---|
632 | int *name = (int *) arg1; |
---|
633 | u_int namelen = arg2; |
---|
634 | int i, j, error; |
---|
635 | struct sysctl_oid *oid; |
---|
636 | struct sysctl_oid_list *lsp = &sysctl__children; |
---|
637 | int newoid[CTL_MAXNAME]; |
---|
638 | |
---|
639 | i = sysctl_sysctl_next_ls(lsp, name, namelen, newoid, &j, 1, &oid); |
---|
640 | if (i) |
---|
641 | return ENOENT; |
---|
642 | error = SYSCTL_OUT(req, newoid, j * sizeof (int)); |
---|
643 | return (error); |
---|
644 | } |
---|
645 | |
---|
646 | SYSCTL_NODE(_sysctl, 2, next, CTLFLAG_RD, sysctl_sysctl_next, ""); |
---|
647 | |
---|
648 | static int |
---|
649 | name2oid (char *name, int *oid, int *len, struct sysctl_oid **oidpp) |
---|
650 | { |
---|
651 | int i; |
---|
652 | struct sysctl_oid *oidp; |
---|
653 | struct sysctl_oid_list *lsp = &sysctl__children; |
---|
654 | char *p; |
---|
655 | |
---|
656 | if (!*name) |
---|
657 | return ENOENT; |
---|
658 | |
---|
659 | p = name + strlen(name) - 1 ; |
---|
660 | if (*p == '.') |
---|
661 | *p = '\0'; |
---|
662 | |
---|
663 | *len = 0; |
---|
664 | |
---|
665 | for (p = name; *p && *p != '.'; p++) |
---|
666 | ; |
---|
667 | i = *p; |
---|
668 | if (i == '.') |
---|
669 | *p = '\0'; |
---|
670 | |
---|
671 | oidp = SLIST_FIRST(lsp); |
---|
672 | |
---|
673 | while (oidp && *len < CTL_MAXNAME) { |
---|
674 | if (strcmp(name, oidp->oid_name)) { |
---|
675 | oidp = SLIST_NEXT(oidp, oid_link); |
---|
676 | continue; |
---|
677 | } |
---|
678 | *oid++ = oidp->oid_number; |
---|
679 | (*len)++; |
---|
680 | |
---|
681 | if (!i) { |
---|
682 | if (oidpp) |
---|
683 | *oidpp = oidp; |
---|
684 | return (0); |
---|
685 | } |
---|
686 | |
---|
687 | if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) |
---|
688 | break; |
---|
689 | |
---|
690 | if (oidp->oid_handler) |
---|
691 | break; |
---|
692 | |
---|
693 | lsp = (struct sysctl_oid_list *)oidp->oid_arg1; |
---|
694 | oidp = SLIST_FIRST(lsp); |
---|
695 | name = p+1; |
---|
696 | for (p = name; *p && *p != '.'; p++) |
---|
697 | ; |
---|
698 | i = *p; |
---|
699 | if (i == '.') |
---|
700 | *p = '\0'; |
---|
701 | } |
---|
702 | return ENOENT; |
---|
703 | } |
---|
704 | |
---|
705 | static int |
---|
706 | sysctl_sysctl_name2oid(SYSCTL_HANDLER_ARGS) |
---|
707 | { |
---|
708 | char *p; |
---|
709 | int error, oid[CTL_MAXNAME], len; |
---|
710 | struct sysctl_oid *op = 0; |
---|
711 | |
---|
712 | if (!req->newlen) |
---|
713 | return ENOENT; |
---|
714 | if (req->newlen >= MAXPATHLEN) /* XXX arbitrary, undocumented */ |
---|
715 | return (ENAMETOOLONG); |
---|
716 | |
---|
717 | p = malloc(req->newlen+1, M_SYSCTL, M_WAITOK); |
---|
718 | |
---|
719 | error = SYSCTL_IN(req, p, req->newlen); |
---|
720 | if (error) { |
---|
721 | free(p, M_SYSCTL); |
---|
722 | return (error); |
---|
723 | } |
---|
724 | |
---|
725 | p [req->newlen] = '\0'; |
---|
726 | |
---|
727 | error = name2oid(p, oid, &len, &op); |
---|
728 | |
---|
729 | free(p, M_SYSCTL); |
---|
730 | |
---|
731 | if (error) |
---|
732 | return (error); |
---|
733 | |
---|
734 | error = SYSCTL_OUT(req, oid, len * sizeof *oid); |
---|
735 | return (error); |
---|
736 | } |
---|
737 | |
---|
738 | SYSCTL_PROC(_sysctl, 3, name2oid, CTLFLAG_RW|CTLFLAG_ANYBODY, 0, 0, |
---|
739 | sysctl_sysctl_name2oid, "I", ""); |
---|
740 | |
---|
741 | static int |
---|
742 | sysctl_sysctl_oidfmt(SYSCTL_HANDLER_ARGS) |
---|
743 | { |
---|
744 | struct sysctl_oid *oid; |
---|
745 | int error; |
---|
746 | |
---|
747 | error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); |
---|
748 | if (error) |
---|
749 | return (error); |
---|
750 | |
---|
751 | if (!oid->oid_fmt) |
---|
752 | return (ENOENT); |
---|
753 | error = SYSCTL_OUT(req, &oid->oid_kind, sizeof(oid->oid_kind)); |
---|
754 | if (error) |
---|
755 | return (error); |
---|
756 | error = SYSCTL_OUT(req, oid->oid_fmt, strlen(oid->oid_fmt) + 1); |
---|
757 | return (error); |
---|
758 | } |
---|
759 | |
---|
760 | |
---|
761 | SYSCTL_NODE(_sysctl, 4, oidfmt, CTLFLAG_RD, sysctl_sysctl_oidfmt, ""); |
---|
762 | |
---|
763 | static int |
---|
764 | sysctl_sysctl_oiddescr(SYSCTL_HANDLER_ARGS) |
---|
765 | { |
---|
766 | struct sysctl_oid *oid; |
---|
767 | int error; |
---|
768 | |
---|
769 | error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); |
---|
770 | if (error) |
---|
771 | return (error); |
---|
772 | |
---|
773 | if (!oid->descr) |
---|
774 | return (ENOENT); |
---|
775 | error = SYSCTL_OUT(req, oid->descr, strlen(oid->descr) + 1); |
---|
776 | return (error); |
---|
777 | } |
---|
778 | |
---|
779 | SYSCTL_NODE(_sysctl, 5, oiddescr, CTLFLAG_RD, sysctl_sysctl_oiddescr, ""); |
---|
780 | |
---|
781 | /* |
---|
782 | * Default "handler" functions. |
---|
783 | */ |
---|
784 | |
---|
785 | /* |
---|
786 | * Handle an int, signed or unsigned. |
---|
787 | * Two cases: |
---|
788 | * a variable: point arg1 at it. |
---|
789 | * a constant: pass it in arg2. |
---|
790 | */ |
---|
791 | |
---|
792 | int |
---|
793 | sysctl_handle_int(SYSCTL_HANDLER_ARGS) |
---|
794 | { |
---|
795 | int tmpout, error = 0; |
---|
796 | |
---|
797 | /* |
---|
798 | * Attempt to get a coherent snapshot by making a copy of the data. |
---|
799 | */ |
---|
800 | if (arg1) |
---|
801 | tmpout = *(int *)arg1; |
---|
802 | else |
---|
803 | tmpout = arg2; |
---|
804 | error = SYSCTL_OUT(req, &tmpout, sizeof(int)); |
---|
805 | |
---|
806 | if (error || !req->newptr) |
---|
807 | return (error); |
---|
808 | |
---|
809 | if (!arg1) |
---|
810 | error = EPERM; |
---|
811 | else |
---|
812 | error = SYSCTL_IN(req, arg1, sizeof(int)); |
---|
813 | return (error); |
---|
814 | } |
---|
815 | |
---|
816 | /* |
---|
817 | * Handle a long, signed or unsigned. arg1 points to it. |
---|
818 | */ |
---|
819 | |
---|
820 | int |
---|
821 | sysctl_handle_long(SYSCTL_HANDLER_ARGS) |
---|
822 | { |
---|
823 | int error = 0; |
---|
824 | long tmpout; |
---|
825 | |
---|
826 | /* |
---|
827 | * Attempt to get a coherent snapshot by making a copy of the data. |
---|
828 | */ |
---|
829 | if (!arg1) |
---|
830 | return (EINVAL); |
---|
831 | tmpout = *(long *)arg1; |
---|
832 | error = SYSCTL_OUT(req, &tmpout, sizeof(long)); |
---|
833 | |
---|
834 | if (error || !req->newptr) |
---|
835 | return (error); |
---|
836 | |
---|
837 | error = SYSCTL_IN(req, arg1, sizeof(long)); |
---|
838 | return (error); |
---|
839 | } |
---|
840 | |
---|
841 | /* |
---|
842 | * Handle our generic '\0' terminated 'C' string. |
---|
843 | * Two cases: |
---|
844 | * a variable string: point arg1 at it, arg2 is max length. |
---|
845 | * a constant string: point arg1 at it, arg2 is zero. |
---|
846 | */ |
---|
847 | |
---|
848 | int |
---|
849 | sysctl_handle_string(SYSCTL_HANDLER_ARGS) |
---|
850 | { |
---|
851 | int error=0; |
---|
852 | char *tmparg; |
---|
853 | size_t outlen; |
---|
854 | |
---|
855 | /* |
---|
856 | * Attempt to get a coherent snapshot by copying to a |
---|
857 | * temporary kernel buffer. |
---|
858 | */ |
---|
859 | retry: |
---|
860 | outlen = strlen((char *)arg1)+1; |
---|
861 | tmparg = malloc(outlen, M_SYSCTLTMP, M_WAITOK); |
---|
862 | |
---|
863 | if (strlcpy(tmparg, (char *)arg1, outlen) >= outlen) { |
---|
864 | free(tmparg, M_SYSCTLTMP); |
---|
865 | goto retry; |
---|
866 | } |
---|
867 | |
---|
868 | error = SYSCTL_OUT(req, tmparg, outlen); |
---|
869 | free(tmparg, M_SYSCTLTMP); |
---|
870 | |
---|
871 | if (error || !req->newptr) |
---|
872 | return (error); |
---|
873 | |
---|
874 | if ((req->newlen - req->newidx) >= arg2) { |
---|
875 | error = EINVAL; |
---|
876 | } else { |
---|
877 | arg2 = (req->newlen - req->newidx); |
---|
878 | error = SYSCTL_IN(req, arg1, arg2); |
---|
879 | ((char *)arg1)[arg2] = '\0'; |
---|
880 | } |
---|
881 | |
---|
882 | return (error); |
---|
883 | } |
---|
884 | |
---|
885 | /* |
---|
886 | * Handle any kind of opaque data. |
---|
887 | * arg1 points to it, arg2 is the size. |
---|
888 | */ |
---|
889 | |
---|
890 | int |
---|
891 | sysctl_handle_opaque(SYSCTL_HANDLER_ARGS) |
---|
892 | { |
---|
893 | int error; |
---|
894 | void *tmparg; |
---|
895 | |
---|
896 | /* |
---|
897 | * Attempt to get a coherent snapshot, either by wiring the |
---|
898 | * user space buffer or copying to a temporary kernel buffer |
---|
899 | * depending on the size of the data. |
---|
900 | */ |
---|
901 | if (arg2 > PAGE_SIZE) { |
---|
902 | sysctl_wire_old_buffer(req, arg2); |
---|
903 | error = SYSCTL_OUT(req, arg1, arg2); |
---|
904 | } else { |
---|
905 | tmparg = malloc(arg2, M_SYSCTLTMP, M_WAITOK); |
---|
906 | bcopy(arg1, tmparg, arg2); |
---|
907 | error = SYSCTL_OUT(req, tmparg, arg2); |
---|
908 | free(tmparg, M_SYSCTLTMP); |
---|
909 | } |
---|
910 | |
---|
911 | if (error || !req->newptr) |
---|
912 | return (error); |
---|
913 | |
---|
914 | error = SYSCTL_IN(req, arg1, arg2); |
---|
915 | |
---|
916 | return (error); |
---|
917 | } |
---|
918 | |
---|
919 | /* |
---|
920 | * Transfer functions to/from kernel space. |
---|
921 | * XXX: rather untested at this point |
---|
922 | */ |
---|
923 | static int |
---|
924 | sysctl_old_kernel(struct sysctl_req *req, const void *p, size_t l) |
---|
925 | { |
---|
926 | size_t i = 0; |
---|
927 | |
---|
928 | if (req->oldptr) { |
---|
929 | i = l; |
---|
930 | if (req->oldlen <= req->oldidx) |
---|
931 | i = 0; |
---|
932 | else |
---|
933 | if (i > req->oldlen - req->oldidx) |
---|
934 | i = req->oldlen - req->oldidx; |
---|
935 | if (i > 0) |
---|
936 | bcopy(p, (char *)req->oldptr + req->oldidx, i); |
---|
937 | } |
---|
938 | req->oldidx += l; |
---|
939 | if (req->oldptr && i != l) |
---|
940 | return (ENOMEM); |
---|
941 | return (0); |
---|
942 | } |
---|
943 | |
---|
944 | static int |
---|
945 | sysctl_new_kernel(struct sysctl_req *req, void *p, size_t l) |
---|
946 | { |
---|
947 | if (!req->newptr) |
---|
948 | return 0; |
---|
949 | if (req->newlen - req->newidx < l) |
---|
950 | return (EINVAL); |
---|
951 | bcopy((char *)req->newptr + req->newidx, p, l); |
---|
952 | req->newidx += l; |
---|
953 | return (0); |
---|
954 | } |
---|
955 | |
---|
956 | int |
---|
957 | kernel_sysctl(struct thread *td, int *name, u_int namelen, void *old, |
---|
958 | size_t *oldlenp, void *new, size_t newlen, size_t *retval) |
---|
959 | { |
---|
960 | int error = 0; |
---|
961 | struct sysctl_req req; |
---|
962 | |
---|
963 | bzero(&req, sizeof req); |
---|
964 | |
---|
965 | req.td = td; |
---|
966 | |
---|
967 | if (oldlenp) { |
---|
968 | req.oldlen = *oldlenp; |
---|
969 | } |
---|
970 | |
---|
971 | if (old) { |
---|
972 | req.oldptr= old; |
---|
973 | } |
---|
974 | |
---|
975 | if (new != NULL) { |
---|
976 | req.newlen = newlen; |
---|
977 | req.newptr = new; |
---|
978 | } |
---|
979 | |
---|
980 | req.oldfunc = sysctl_old_kernel; |
---|
981 | req.newfunc = sysctl_new_kernel; |
---|
982 | req.lock = REQ_LOCKED; |
---|
983 | |
---|
984 | SYSCTL_LOCK(); |
---|
985 | |
---|
986 | error = sysctl_root(0, name, namelen, &req); |
---|
987 | |
---|
988 | if (req.lock == REQ_WIRED) |
---|
989 | #ifdef __rtems__ |
---|
990 | printf ("kern_sysctl: vsunlock needs to be called!\n"); |
---|
991 | #else |
---|
992 | vsunlock(req.oldptr, req.oldlen); |
---|
993 | #endif |
---|
994 | |
---|
995 | SYSCTL_UNLOCK(); |
---|
996 | |
---|
997 | if (error && error != ENOMEM) |
---|
998 | return (error); |
---|
999 | |
---|
1000 | if (retval) { |
---|
1001 | if (req.oldptr && req.oldidx > req.oldlen) |
---|
1002 | *retval = req.oldlen; |
---|
1003 | else |
---|
1004 | *retval = req.oldidx; |
---|
1005 | } |
---|
1006 | return (error); |
---|
1007 | } |
---|
1008 | |
---|
1009 | int |
---|
1010 | kernel_sysctlbyname(struct thread *td, char *name, void *old, size_t *oldlenp, |
---|
1011 | void *new, size_t newlen, size_t *retval) |
---|
1012 | { |
---|
1013 | int oid[CTL_MAXNAME]; |
---|
1014 | size_t oidlen, plen; |
---|
1015 | int error; |
---|
1016 | |
---|
1017 | oid[0] = 0; /* sysctl internal magic */ |
---|
1018 | oid[1] = 3; /* name2oid */ |
---|
1019 | oidlen = sizeof(oid); |
---|
1020 | |
---|
1021 | error = kernel_sysctl(td, oid, 2, oid, &oidlen, |
---|
1022 | (void *)name, strlen(name), &plen); |
---|
1023 | if (error) |
---|
1024 | return (error); |
---|
1025 | |
---|
1026 | error = kernel_sysctl(td, oid, plen / sizeof(int), old, oldlenp, |
---|
1027 | new, newlen, retval); |
---|
1028 | return (error); |
---|
1029 | } |
---|
1030 | |
---|
1031 | /* |
---|
1032 | * Transfer function to/from user space. |
---|
1033 | */ |
---|
1034 | static int |
---|
1035 | sysctl_old_user(struct sysctl_req *req, const void *p, size_t l) |
---|
1036 | { |
---|
1037 | int error = 0; |
---|
1038 | size_t i = 0; |
---|
1039 | |
---|
1040 | #ifndef __rtems__ |
---|
1041 | if (req->lock == 1 && req->oldptr) |
---|
1042 | WITNESS_SLEEP(1, NULL); |
---|
1043 | #endif |
---|
1044 | if (req->oldptr) { |
---|
1045 | i = l; |
---|
1046 | if (req->oldlen <= req->oldidx) |
---|
1047 | i = 0; |
---|
1048 | else |
---|
1049 | if (i > req->oldlen - req->oldidx) |
---|
1050 | i = req->oldlen - req->oldidx; |
---|
1051 | if (i > 0) |
---|
1052 | error = copyout(p, (char *)req->oldptr + req->oldidx, |
---|
1053 | i); |
---|
1054 | } |
---|
1055 | req->oldidx += l; |
---|
1056 | if (error) |
---|
1057 | return (error); |
---|
1058 | if (req->oldptr && i < l) |
---|
1059 | return (ENOMEM); |
---|
1060 | return (0); |
---|
1061 | } |
---|
1062 | |
---|
1063 | static int |
---|
1064 | sysctl_new_user(struct sysctl_req *req, void *p, size_t l) |
---|
1065 | { |
---|
1066 | int error; |
---|
1067 | |
---|
1068 | if (!req->newptr) |
---|
1069 | return 0; |
---|
1070 | if (req->newlen - req->newidx < l) |
---|
1071 | return (EINVAL); |
---|
1072 | error = copyin((char *)req->newptr + req->newidx, p, l); |
---|
1073 | req->newidx += l; |
---|
1074 | return (error); |
---|
1075 | } |
---|
1076 | |
---|
1077 | /* |
---|
1078 | * Wire the user space destination buffer. If set to a value greater than |
---|
1079 | * zero, the len parameter limits the maximum amount of wired memory. |
---|
1080 | * |
---|
1081 | * XXX - The len parameter is currently ignored due to the lack of |
---|
1082 | * a place to save it in the sysctl_req structure so that the matching |
---|
1083 | * amount of memory can be unwired in the sysctl exit code. |
---|
1084 | */ |
---|
1085 | int |
---|
1086 | sysctl_wire_old_buffer(struct sysctl_req *req, size_t len) |
---|
1087 | { |
---|
1088 | if (req->lock == REQ_LOCKED && req->oldptr && |
---|
1089 | req->oldfunc == sysctl_old_user) { |
---|
1090 | #ifndef __rtems__ |
---|
1091 | vslock(req->oldptr, req->oldlen); |
---|
1092 | #endif |
---|
1093 | req->lock = REQ_WIRED; |
---|
1094 | } |
---|
1095 | return (0); |
---|
1096 | } |
---|
1097 | |
---|
1098 | int |
---|
1099 | sysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid, |
---|
1100 | int *nindx, struct sysctl_req *req) |
---|
1101 | { |
---|
1102 | struct sysctl_oid *oid; |
---|
1103 | int indx; |
---|
1104 | |
---|
1105 | oid = SLIST_FIRST(&sysctl__children); |
---|
1106 | indx = 0; |
---|
1107 | while (oid && indx < CTL_MAXNAME) { |
---|
1108 | if (oid->oid_number == name[indx]) { |
---|
1109 | indx++; |
---|
1110 | if (oid->oid_kind & CTLFLAG_NOLOCK) |
---|
1111 | req->lock = REQ_UNLOCKED; |
---|
1112 | if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { |
---|
1113 | if (oid->oid_handler != NULL || |
---|
1114 | indx == namelen) { |
---|
1115 | *noid = oid; |
---|
1116 | if (nindx != NULL) |
---|
1117 | *nindx = indx; |
---|
1118 | return (0); |
---|
1119 | } |
---|
1120 | oid = SLIST_FIRST( |
---|
1121 | (struct sysctl_oid_list *)oid->oid_arg1); |
---|
1122 | } else if (indx == namelen) { |
---|
1123 | *noid = oid; |
---|
1124 | if (nindx != NULL) |
---|
1125 | *nindx = indx; |
---|
1126 | return (0); |
---|
1127 | } else { |
---|
1128 | return (ENOTDIR); |
---|
1129 | } |
---|
1130 | } else { |
---|
1131 | oid = SLIST_NEXT(oid, oid_link); |
---|
1132 | } |
---|
1133 | } |
---|
1134 | return (ENOENT); |
---|
1135 | } |
---|
1136 | |
---|
1137 | /* |
---|
1138 | * Traverse our tree, and find the right node, execute whatever it points |
---|
1139 | * to, and return the resulting error code. |
---|
1140 | */ |
---|
1141 | |
---|
1142 | static int |
---|
1143 | sysctl_root(SYSCTL_HANDLER_ARGS) |
---|
1144 | { |
---|
1145 | struct sysctl_oid *oid; |
---|
1146 | int error, indx; |
---|
1147 | |
---|
1148 | error = sysctl_find_oid(arg1, arg2, &oid, &indx, req); |
---|
1149 | if (error) |
---|
1150 | return (error); |
---|
1151 | |
---|
1152 | if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { |
---|
1153 | /* |
---|
1154 | * You can't call a sysctl when it's a node, but has |
---|
1155 | * no handler. Inform the user that it's a node. |
---|
1156 | * The indx may or may not be the same as namelen. |
---|
1157 | */ |
---|
1158 | if (oid->oid_handler == NULL) |
---|
1159 | return (EISDIR); |
---|
1160 | } |
---|
1161 | |
---|
1162 | /* Is this sysctl writable? */ |
---|
1163 | if (req->newptr && !(oid->oid_kind & CTLFLAG_WR)) |
---|
1164 | return (EPERM); |
---|
1165 | |
---|
1166 | #ifndef __rtems__ |
---|
1167 | KASSERT(req->td != NULL, ("sysctl_root(): req->td == NULL")); |
---|
1168 | |
---|
1169 | /* Is this sysctl sensitive to securelevels? */ |
---|
1170 | if (req->newptr && (oid->oid_kind & CTLFLAG_SECURE)) { |
---|
1171 | error = securelevel_gt(req->td->td_ucred, 0); |
---|
1172 | if (error) |
---|
1173 | return (error); |
---|
1174 | } |
---|
1175 | |
---|
1176 | /* Is this sysctl writable by only privileged users? */ |
---|
1177 | if (req->newptr && !(oid->oid_kind & CTLFLAG_ANYBODY)) { |
---|
1178 | int flags; |
---|
1179 | |
---|
1180 | if (oid->oid_kind & CTLFLAG_PRISON) |
---|
1181 | flags = PRISON_ROOT; |
---|
1182 | else |
---|
1183 | flags = 0; |
---|
1184 | error = suser_cred(req->td->td_ucred, flags); |
---|
1185 | if (error) |
---|
1186 | return (error); |
---|
1187 | } |
---|
1188 | #endif |
---|
1189 | |
---|
1190 | if (!oid->oid_handler) |
---|
1191 | return EINVAL; |
---|
1192 | |
---|
1193 | if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) |
---|
1194 | error = oid->oid_handler(oid, (int *)arg1 + indx, arg2 - indx, |
---|
1195 | req); |
---|
1196 | else |
---|
1197 | error = oid->oid_handler(oid, oid->oid_arg1, oid->oid_arg2, |
---|
1198 | req); |
---|
1199 | return (error); |
---|
1200 | } |
---|
1201 | |
---|
1202 | #ifndef _SYS_SYSPROTO_H_ |
---|
1203 | struct sysctl_args { |
---|
1204 | int *name; |
---|
1205 | u_int namelen; |
---|
1206 | void *old; |
---|
1207 | size_t *oldlenp; |
---|
1208 | void *new; |
---|
1209 | size_t newlen; |
---|
1210 | }; |
---|
1211 | #endif |
---|
1212 | |
---|
1213 | /* |
---|
1214 | * MPSAFE |
---|
1215 | */ |
---|
1216 | int |
---|
1217 | __sysctl(struct thread *td, struct sysctl_args *uap) |
---|
1218 | { |
---|
1219 | int error, name[CTL_MAXNAME]; |
---|
1220 | size_t j; |
---|
1221 | |
---|
1222 | if (uap->namelen > CTL_MAXNAME || uap->namelen < 2) |
---|
1223 | return (EINVAL); |
---|
1224 | |
---|
1225 | error = copyin(uap->name, &name, uap->namelen * sizeof(int)); |
---|
1226 | if (error) |
---|
1227 | return (error); |
---|
1228 | |
---|
1229 | mtx_lock(&Giant); |
---|
1230 | |
---|
1231 | error = userland_sysctl(td, name, uap->namelen, |
---|
1232 | uap->old, uap->oldlenp, 0, |
---|
1233 | uap->new, uap->newlen, &j); |
---|
1234 | if (error && error != ENOMEM) |
---|
1235 | goto done2; |
---|
1236 | if (uap->oldlenp) { |
---|
1237 | int i = copyout(&j, uap->oldlenp, sizeof(j)); |
---|
1238 | if (i) |
---|
1239 | error = i; |
---|
1240 | } |
---|
1241 | done2: |
---|
1242 | mtx_unlock(&Giant); |
---|
1243 | return (error); |
---|
1244 | } |
---|
1245 | |
---|
1246 | /* |
---|
1247 | * This is used from various compatibility syscalls too. That's why name |
---|
1248 | * must be in kernel space. |
---|
1249 | */ |
---|
1250 | int |
---|
1251 | userland_sysctl(struct thread *td, int *name, u_int namelen, void *old, |
---|
1252 | size_t *oldlenp, int inkernel, void *new, size_t newlen, size_t *retval) |
---|
1253 | { |
---|
1254 | int error = 0; |
---|
1255 | struct sysctl_req req, req2; |
---|
1256 | |
---|
1257 | bzero(&req, sizeof req); |
---|
1258 | |
---|
1259 | req.td = td; |
---|
1260 | |
---|
1261 | if (oldlenp) { |
---|
1262 | if (inkernel) { |
---|
1263 | req.oldlen = *oldlenp; |
---|
1264 | } else { |
---|
1265 | error = copyin(oldlenp, &req.oldlen, sizeof(*oldlenp)); |
---|
1266 | if (error) |
---|
1267 | return (error); |
---|
1268 | } |
---|
1269 | } |
---|
1270 | |
---|
1271 | if (old) { |
---|
1272 | #ifndef __rtems__ |
---|
1273 | if (!useracc(old, req.oldlen, VM_PROT_WRITE)) |
---|
1274 | return (EFAULT); |
---|
1275 | #endif |
---|
1276 | req.oldptr= old; |
---|
1277 | } |
---|
1278 | |
---|
1279 | if (new != NULL) { |
---|
1280 | #ifndef __rtems__ |
---|
1281 | if (!useracc(new, req.newlen, VM_PROT_READ)) |
---|
1282 | return (EFAULT); |
---|
1283 | #endif |
---|
1284 | req.newlen = newlen; |
---|
1285 | req.newptr = new; |
---|
1286 | } |
---|
1287 | |
---|
1288 | req.oldfunc = sysctl_old_user; |
---|
1289 | req.newfunc = sysctl_new_user; |
---|
1290 | req.lock = REQ_LOCKED; |
---|
1291 | |
---|
1292 | SYSCTL_LOCK(); |
---|
1293 | |
---|
1294 | #ifdef MAC |
---|
1295 | error = mac_check_system_sysctl(td->td_ucred, name, namelen, old, |
---|
1296 | oldlenp, inkernel, new, newlen); |
---|
1297 | if (error) { |
---|
1298 | SYSCTL_UNLOCK(); |
---|
1299 | return (error); |
---|
1300 | } |
---|
1301 | #endif |
---|
1302 | |
---|
1303 | do { |
---|
1304 | req2 = req; |
---|
1305 | error = sysctl_root(0, name, namelen, &req2); |
---|
1306 | } while (error == EAGAIN); |
---|
1307 | |
---|
1308 | req = req2; |
---|
1309 | #ifndef __rtems__ |
---|
1310 | if (req.lock == REQ_WIRED) |
---|
1311 | vsunlock(req.oldptr, req.oldlen); |
---|
1312 | #endif |
---|
1313 | |
---|
1314 | SYSCTL_UNLOCK(); |
---|
1315 | |
---|
1316 | if (error && error != ENOMEM) |
---|
1317 | return (error); |
---|
1318 | |
---|
1319 | if (retval) { |
---|
1320 | if (req.oldptr && req.oldidx > req.oldlen) |
---|
1321 | *retval = req.oldlen; |
---|
1322 | else |
---|
1323 | *retval = req.oldidx; |
---|
1324 | } |
---|
1325 | return (error); |
---|
1326 | } |
---|
1327 | |
---|
1328 | #ifdef COMPAT_43 |
---|
1329 | #include <sys/socket.h> |
---|
1330 | #include <vm/vm_param.h> |
---|
1331 | |
---|
1332 | #define KINFO_PROC (0<<8) |
---|
1333 | #define KINFO_RT (1<<8) |
---|
1334 | #define KINFO_VNODE (2<<8) |
---|
1335 | #define KINFO_FILE (3<<8) |
---|
1336 | #define KINFO_METER (4<<8) |
---|
1337 | #define KINFO_LOADAVG (5<<8) |
---|
1338 | #define KINFO_CLOCKRATE (6<<8) |
---|
1339 | |
---|
1340 | /* Non-standard BSDI extension - only present on their 4.3 net-2 releases */ |
---|
1341 | #define KINFO_BSDI_SYSINFO (101<<8) |
---|
1342 | |
---|
1343 | /* |
---|
1344 | * XXX this is bloat, but I hope it's better here than on the potentially |
---|
1345 | * limited kernel stack... -Peter |
---|
1346 | */ |
---|
1347 | |
---|
1348 | static struct { |
---|
1349 | int bsdi_machine; /* "i386" on BSD/386 */ |
---|
1350 | /* ^^^ this is an offset to the string, relative to the struct start */ |
---|
1351 | char *pad0; |
---|
1352 | long pad1; |
---|
1353 | long pad2; |
---|
1354 | long pad3; |
---|
1355 | u_long pad4; |
---|
1356 | u_long pad5; |
---|
1357 | u_long pad6; |
---|
1358 | |
---|
1359 | int bsdi_ostype; /* "BSD/386" on BSD/386 */ |
---|
1360 | int bsdi_osrelease; /* "1.1" on BSD/386 */ |
---|
1361 | long pad7; |
---|
1362 | long pad8; |
---|
1363 | char *pad9; |
---|
1364 | |
---|
1365 | long pad10; |
---|
1366 | long pad11; |
---|
1367 | int pad12; |
---|
1368 | long pad13; |
---|
1369 | quad_t pad14; |
---|
1370 | long pad15; |
---|
1371 | |
---|
1372 | struct timeval pad16; |
---|
1373 | /* we dont set this, because BSDI's uname used gethostname() instead */ |
---|
1374 | int bsdi_hostname; /* hostname on BSD/386 */ |
---|
1375 | |
---|
1376 | /* the actual string data is appended here */ |
---|
1377 | |
---|
1378 | } bsdi_si; |
---|
1379 | /* |
---|
1380 | * this data is appended to the end of the bsdi_si structure during copyout. |
---|
1381 | * The "char *" offsets are relative to the base of the bsdi_si struct. |
---|
1382 | * This contains "FreeBSD\02.0-BUILT-nnnnnn\0i386\0", and these strings |
---|
1383 | * should not exceed the length of the buffer here... (or else!! :-) |
---|
1384 | */ |
---|
1385 | static char bsdi_strings[80]; /* It had better be less than this! */ |
---|
1386 | |
---|
1387 | #ifndef _SYS_SYSPROTO_H_ |
---|
1388 | struct getkerninfo_args { |
---|
1389 | int op; |
---|
1390 | char *where; |
---|
1391 | size_t *size; |
---|
1392 | int arg; |
---|
1393 | }; |
---|
1394 | #endif |
---|
1395 | |
---|
1396 | /* |
---|
1397 | * MPSAFE |
---|
1398 | */ |
---|
1399 | int |
---|
1400 | ogetkerninfo(struct thread *td, struct getkerninfo_args *uap) |
---|
1401 | { |
---|
1402 | int error, name[6]; |
---|
1403 | size_t size; |
---|
1404 | u_int needed = 0; |
---|
1405 | |
---|
1406 | mtx_lock(&Giant); |
---|
1407 | |
---|
1408 | switch (uap->op & 0xff00) { |
---|
1409 | |
---|
1410 | case KINFO_RT: |
---|
1411 | name[0] = CTL_NET; |
---|
1412 | name[1] = PF_ROUTE; |
---|
1413 | name[2] = 0; |
---|
1414 | name[3] = (uap->op & 0xff0000) >> 16; |
---|
1415 | name[4] = uap->op & 0xff; |
---|
1416 | name[5] = uap->arg; |
---|
1417 | error = userland_sysctl(td, name, 6, uap->where, uap->size, |
---|
1418 | 0, 0, 0, &size); |
---|
1419 | break; |
---|
1420 | |
---|
1421 | case KINFO_VNODE: |
---|
1422 | name[0] = CTL_KERN; |
---|
1423 | name[1] = KERN_VNODE; |
---|
1424 | error = userland_sysctl(td, name, 2, uap->where, uap->size, |
---|
1425 | 0, 0, 0, &size); |
---|
1426 | break; |
---|
1427 | |
---|
1428 | case KINFO_PROC: |
---|
1429 | name[0] = CTL_KERN; |
---|
1430 | name[1] = KERN_PROC; |
---|
1431 | name[2] = uap->op & 0xff; |
---|
1432 | name[3] = uap->arg; |
---|
1433 | error = userland_sysctl(td, name, 4, uap->where, uap->size, |
---|
1434 | 0, 0, 0, &size); |
---|
1435 | break; |
---|
1436 | |
---|
1437 | case KINFO_FILE: |
---|
1438 | name[0] = CTL_KERN; |
---|
1439 | name[1] = KERN_FILE; |
---|
1440 | error = userland_sysctl(td, name, 2, uap->where, uap->size, |
---|
1441 | 0, 0, 0, &size); |
---|
1442 | break; |
---|
1443 | |
---|
1444 | case KINFO_METER: |
---|
1445 | name[0] = CTL_VM; |
---|
1446 | name[1] = VM_TOTAL; |
---|
1447 | error = userland_sysctl(td, name, 2, uap->where, uap->size, |
---|
1448 | 0, 0, 0, &size); |
---|
1449 | break; |
---|
1450 | |
---|
1451 | case KINFO_LOADAVG: |
---|
1452 | name[0] = CTL_VM; |
---|
1453 | name[1] = VM_LOADAVG; |
---|
1454 | error = userland_sysctl(td, name, 2, uap->where, uap->size, |
---|
1455 | 0, 0, 0, &size); |
---|
1456 | break; |
---|
1457 | |
---|
1458 | case KINFO_CLOCKRATE: |
---|
1459 | name[0] = CTL_KERN; |
---|
1460 | name[1] = KERN_CLOCKRATE; |
---|
1461 | error = userland_sysctl(td, name, 2, uap->where, uap->size, |
---|
1462 | 0, 0, 0, &size); |
---|
1463 | break; |
---|
1464 | |
---|
1465 | case KINFO_BSDI_SYSINFO: { |
---|
1466 | /* |
---|
1467 | * this is pretty crude, but it's just enough for uname() |
---|
1468 | * from BSDI's 1.x libc to work. |
---|
1469 | * |
---|
1470 | * *size gives the size of the buffer before the call, and |
---|
1471 | * the amount of data copied after a successful call. |
---|
1472 | * If successful, the return value is the amount of data |
---|
1473 | * available, which can be larger than *size. |
---|
1474 | * |
---|
1475 | * BSDI's 2.x product apparently fails with ENOMEM if *size |
---|
1476 | * is too small. |
---|
1477 | */ |
---|
1478 | |
---|
1479 | u_int left; |
---|
1480 | char *s; |
---|
1481 | |
---|
1482 | bzero((char *)&bsdi_si, sizeof(bsdi_si)); |
---|
1483 | bzero(bsdi_strings, sizeof(bsdi_strings)); |
---|
1484 | |
---|
1485 | s = bsdi_strings; |
---|
1486 | |
---|
1487 | bsdi_si.bsdi_ostype = (s - bsdi_strings) + sizeof(bsdi_si); |
---|
1488 | strcpy(s, ostype); |
---|
1489 | s += strlen(s) + 1; |
---|
1490 | |
---|
1491 | bsdi_si.bsdi_osrelease = (s - bsdi_strings) + sizeof(bsdi_si); |
---|
1492 | strcpy(s, osrelease); |
---|
1493 | s += strlen(s) + 1; |
---|
1494 | |
---|
1495 | bsdi_si.bsdi_machine = (s - bsdi_strings) + sizeof(bsdi_si); |
---|
1496 | strcpy(s, machine); |
---|
1497 | s += strlen(s) + 1; |
---|
1498 | |
---|
1499 | needed = sizeof(bsdi_si) + (s - bsdi_strings); |
---|
1500 | |
---|
1501 | if ((uap->where == NULL) || (uap->size == NULL)) { |
---|
1502 | /* process is asking how much buffer to supply.. */ |
---|
1503 | size = needed; |
---|
1504 | error = 0; |
---|
1505 | break; |
---|
1506 | } |
---|
1507 | |
---|
1508 | if ((error = copyin(uap->size, &size, sizeof(size))) != 0) |
---|
1509 | break; |
---|
1510 | |
---|
1511 | /* if too much buffer supplied, trim it down */ |
---|
1512 | if (size > needed) |
---|
1513 | size = needed; |
---|
1514 | |
---|
1515 | /* how much of the buffer is remaining */ |
---|
1516 | left = size; |
---|
1517 | |
---|
1518 | if ((error = copyout((char *)&bsdi_si, uap->where, left)) != 0) |
---|
1519 | break; |
---|
1520 | |
---|
1521 | /* is there any point in continuing? */ |
---|
1522 | if (left > sizeof(bsdi_si)) { |
---|
1523 | left -= sizeof(bsdi_si); |
---|
1524 | error = copyout(&bsdi_strings, |
---|
1525 | uap->where + sizeof(bsdi_si), left); |
---|
1526 | } |
---|
1527 | break; |
---|
1528 | } |
---|
1529 | |
---|
1530 | default: |
---|
1531 | error = EOPNOTSUPP; |
---|
1532 | break; |
---|
1533 | } |
---|
1534 | if (error == 0) { |
---|
1535 | td->td_retval[0] = needed ? needed : size; |
---|
1536 | if (uap->size) { |
---|
1537 | error = copyout(&size, uap->size, sizeof(size)); |
---|
1538 | } |
---|
1539 | } |
---|
1540 | mtx_unlock(&Giant); |
---|
1541 | return (error); |
---|
1542 | } |
---|
1543 | #endif /* COMPAT_43 */ |
---|