Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/common/linux_sysctl.c
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1 /* $NetBSD: linux_sysctl.c,v 1.36 2008/06/18 12:24:18 tsutsui Exp $ */ 2 3 /*- 4 * Copyright (c) 2003 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Brown. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * sysctl system call. 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: linux_sysctl.c,v 1.36 2008/06/18 12:24:18 tsutsui Exp $"); 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/errno.h> 42 #include <sys/proc.h> 43 #include <sys/mount.h> 44 #include <sys/sysctl.h> 45 #include <sys/sched.h> 46 #include <sys/syscallargs.h> 47 #include <sys/ktrace.h> 48 49 #include <compat/linux/common/linux_types.h> 50 #include <compat/linux/common/linux_signal.h> 51 #include <compat/linux/common/linux_ipc.h> 52 #include <compat/linux/common/linux_sem.h> 53 54 #include <compat/linux/linux_syscallargs.h> 55 #include <compat/linux/common/linux_sysctl.h> 56 #include <compat/linux/common/linux_exec.h> 57 #include <compat/linux/common/linux_machdep.h> 58 59 char linux_sysname[128] = "Linux"; 60 #if defined(__amd64__) || defined(__i386__) || defined(__powerpc__) 61 char linux_release[128] = "2.4.18"; 62 char linux_version[128] = "#0 Wed Feb 20 20:00:02 CET 2002"; 63 #else 64 char linux_release[128] = "2.0.38"; 65 char linux_version[128] = "#0 Sun Nov 11 11:11:11 MET 2000"; 66 #endif 67 68 #ifndef _LKM 69 static 70 #endif 71 struct sysctlnode linux_sysctl_root = { 72 .sysctl_flags = SYSCTL_VERSION| 73 CTLFLAG_ROOT|CTLTYPE_NODE|CTLFLAG_READWRITE, 74 .sysctl_num = 0, 75 .sysctl_name = "(linux_root)", 76 sysc_init_field(_sysctl_size, sizeof(struct sysctlnode)), 77 }; 78 79 /* 80 * setup for small sysctl tree used by emulation 81 */ 82 SYSCTL_SETUP(linux_sysctl_setup, "linux emulated sysctl subtree setup") 83 { 84 const struct sysctlnode *node = &linux_sysctl_root; 85 86 sysctl_createv(clog, 0, &node, &node, 87 CTLFLAG_PERMANENT, 88 CTLTYPE_NODE, "kern", NULL, 89 NULL, 0, NULL, 0, 90 LINUX_CTL_KERN, CTL_EOL); 91 92 sysctl_createv(clog, 0, &node, NULL, 93 CTLFLAG_PERMANENT, 94 CTLTYPE_STRING, "ostype", NULL, 95 NULL, 0, linux_sysname, sizeof(linux_sysname), 96 LINUX_KERN_OSTYPE, CTL_EOL); 97 sysctl_createv(clog, 0, &node, NULL, 98 CTLFLAG_PERMANENT, 99 CTLTYPE_STRING, "osrelease", NULL, 100 NULL, 0, linux_release, sizeof(linux_release), 101 LINUX_KERN_OSRELEASE, CTL_EOL); 102 sysctl_createv(clog, 0, &node, NULL, 103 CTLFLAG_PERMANENT, 104 CTLTYPE_STRING, "version", NULL, 105 NULL, 0, linux_version, sizeof(linux_version), 106 LINUX_KERN_VERSION, CTL_EOL); 107 108 linux_sysctl_root.sysctl_flags &= ~CTLFLAG_READWRITE; 109 } 110 111 /* 112 * linux sysctl system call 113 */ 114 int 115 linux_sys___sysctl(struct lwp *l, const struct linux_sys___sysctl_args *uap, register_t *retval) 116 { 117 struct linux___sysctl ls; 118 int error, nerror, name[CTL_MAXNAME]; 119 size_t savelen = 0, oldlen = 0; 120 121 /* 122 * get linux args structure 123 */ 124 if ((error = copyin(SCARG(uap, lsp), &ls, sizeof(ls)))) 125 return error; 126 127 /* 128 * get oldlen 129 */ 130 oldlen = 0; 131 if (ls.oldlenp != NULL) { 132 error = copyin(ls.oldlenp, &oldlen, sizeof(oldlen)); 133 if (error) 134 return (error); 135 } 136 savelen = oldlen; 137 138 /* 139 * top-level sysctl names may or may not be non-terminal, but 140 * we don't care 141 */ 142 if (ls.nlen > CTL_MAXNAME || ls.nlen < 1) 143 return (EINVAL); 144 error = copyin(ls.name, &name, ls.nlen * sizeof(int)); 145 if (error) 146 return (error); 147 148 ktrmib(name, ls.nlen); 149 150 /* 151 * dispatch request into linux sysctl tree 152 */ 153 sysctl_lock(ls.newval != NULL); 154 error = sysctl_dispatch(&name[0], ls.nlen, 155 ls.oldval, &oldlen, 156 ls.newval, ls.newlen, 157 &name[0], l, &linux_sysctl_root); 158 sysctl_unlock(); 159 160 /* 161 * reset caller's oldlen, even if we got an error 162 */ 163 if (ls.oldlenp) { 164 nerror = copyout(&oldlen, ls.oldlenp, sizeof(oldlen)); 165 if (error == 0) 166 error = nerror; 167 } 168 169 /* 170 * if the only problem is that we weren't given enough space, 171 * that's an ENOMEM error 172 */ 173 if (error == 0 && ls.oldval != NULL && savelen < oldlen) 174 error = ENOMEM; 175 176 return (error); 177 } 178 179 /* 180 * kernel related system variables under emul.linux in the main sysctl 181 * tree 182 */ 183 SYSCTL_SETUP(sysctl_emul_linux_setup, "sysctl emul.linux subtree setup") 184 { 185 186 sysctl_createv(clog, 0, NULL, NULL, 187 CTLFLAG_PERMANENT, 188 CTLTYPE_NODE, "emul", NULL, 189 NULL, 0, NULL, 0, 190 CTL_EMUL, CTL_EOL); 191 sysctl_createv(clog, 0, NULL, NULL, 192 CTLFLAG_PERMANENT, 193 CTLTYPE_NODE, "linux", 194 SYSCTL_DESCR("Linux emulation settings"), 195 NULL, 0, NULL, 0, 196 CTL_EMUL, EMUL_LINUX, CTL_EOL); 197 sysctl_createv(clog, 0, NULL, NULL, 198 CTLFLAG_PERMANENT, 199 CTLTYPE_NODE, "kern", 200 SYSCTL_DESCR("Linux kernel emulation settings"), 201 NULL, 0, NULL, 0, 202 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, CTL_EOL); 203 204 sysctl_createv(clog, 0, NULL, NULL, 205 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 206 CTLTYPE_STRING, "ostype", 207 SYSCTL_DESCR("Linux operating system type"), 208 NULL, 0, linux_sysname, sizeof(linux_sysname), 209 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 210 EMUL_LINUX_KERN_OSTYPE, CTL_EOL); 211 sysctl_createv(clog, 0, NULL, NULL, 212 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 213 CTLTYPE_STRING, "osrelease", 214 SYSCTL_DESCR("Linux operating system release"), 215 NULL, 0, linux_release, sizeof(linux_release), 216 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 217 EMUL_LINUX_KERN_OSRELEASE, CTL_EOL); 218 sysctl_createv(clog, 0, NULL, NULL, 219 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 220 CTLTYPE_STRING, "osversion", 221 SYSCTL_DESCR("Linux operating system revision"), 222 NULL, 0, linux_version, sizeof(linux_version), 223 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 224 EMUL_LINUX_KERN_VERSION, CTL_EOL); 225 }
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