1 /* $NetBSD: linux_sysctl.c,v 1.25 2007/02/09 21:55:19 ad 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * sysctl system call. 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: linux_sysctl.c,v 1.25 2007/02/09 21:55:19 ad Exp $"); 45 46 #if defined (_KERNEL_OPT) 47 #include "opt_ktrace.h" 48 #endif 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/errno.h> 53 #include <sys/proc.h> 54 #include <sys/mount.h> 55 #include <sys/sysctl.h> 56 #include <sys/syscallargs.h> 57 #ifdef KTRACE 58 #include <sys/ktrace.h> 59 #endif 60 61 #include <compat/linux/common/linux_types.h> 62 #include <compat/linux/common/linux_signal.h> 63 64 #include <compat/linux/linux_syscallargs.h> 65 #include <compat/linux/common/linux_sysctl.h> 66 #include <compat/linux/common/linux_exec.h> 67 68 char linux_sysname[128] = "Linux"; 69 #if defined(__amd64__) || defined(__i386__) || defined(__powerpc__) 70 char linux_release[128] = "2.4.18"; 71 char linux_version[128] = "#0 Wed Feb 20 20:00:02 CET 2002"; 72 #else 73 char linux_release[128] = "2.0.38"; 74 char linux_version[128] = "#0 Sun Nov 11 11:11:11 MET 2000"; 75 #endif 76 77 #ifndef _LKM 78 static 79 #endif 80 struct sysctlnode linux_sysctl_root = { 81 .sysctl_flags = SYSCTL_VERSION| 82 CTLFLAG_ROOT|CTLTYPE_NODE|CTLFLAG_READWRITE, 83 .sysctl_num = 0, 84 .sysctl_name = "(linux_root)", 85 sysc_init_field(_sysctl_size, sizeof(struct sysctlnode)), 86 }; 87 88 /* 89 * setup for small sysctl tree used by emulation 90 */ 91 SYSCTL_SETUP(linux_sysctl_setup, "linux emulated sysctl subtree setup") 92 { 93 const struct sysctlnode *node = &linux_sysctl_root; 94 95 sysctl_createv(clog, 0, &node, &node, 96 CTLFLAG_PERMANENT, 97 CTLTYPE_NODE, "kern", NULL, 98 NULL, 0, NULL, 0, 99 LINUX_CTL_KERN, CTL_EOL); 100 101 sysctl_createv(clog, 0, &node, NULL, 102 CTLFLAG_PERMANENT, 103 CTLTYPE_STRING, "ostype", NULL, 104 NULL, 0, linux_sysname, sizeof(linux_sysname), 105 LINUX_KERN_OSTYPE, CTL_EOL); 106 sysctl_createv(clog, 0, &node, NULL, 107 CTLFLAG_PERMANENT, 108 CTLTYPE_STRING, "osrelease", NULL, 109 NULL, 0, linux_release, sizeof(linux_release), 110 LINUX_KERN_OSRELEASE, CTL_EOL); 111 sysctl_createv(clog, 0, &node, NULL, 112 CTLFLAG_PERMANENT, 113 CTLTYPE_STRING, "version", NULL, 114 NULL, 0, linux_version, sizeof(linux_version), 115 LINUX_KERN_VERSION, CTL_EOL); 116 117 linux_sysctl_root.sysctl_flags &= ~CTLFLAG_READWRITE; 118 } 119 120 /* 121 * linux sysctl system call 122 */ 123 int 124 linux_sys___sysctl(struct lwp *l, void *v, register_t *retval) 125 { 126 struct linux_sys___sysctl_args *uap = v; 127 struct linux___sysctl ls; 128 int error, nerror, name[CTL_MAXNAME]; 129 size_t savelen = 0, oldlen = 0; 130 131 /* 132 * get linux args structure 133 */ 134 if ((error = copyin(SCARG(uap, lsp), &ls, sizeof(ls)))) 135 return error; 136 137 /* 138 * get oldlen 139 */ 140 oldlen = 0; 141 if (ls.oldlenp != NULL) { 142 error = copyin(ls.oldlenp, &oldlen, sizeof(oldlen)); 143 if (error) 144 return (error); 145 } 146 savelen = oldlen; 147 148 /* 149 * top-level sysctl names may or may not be non-terminal, but 150 * we don't care 151 */ 152 if (ls.nlen > CTL_MAXNAME || ls.nlen < 1) 153 return (EINVAL); 154 error = copyin(ls.name, &name, ls.nlen * sizeof(int)); 155 if (error) 156 return (error); 157 158 #ifdef KTRACE 159 if (KTRPOINT(l->l_proc, KTR_MIB)) 160 ktrmib(l, name, ls.nlen); 161 #endif 162 /* 163 * wire old so that copyout() is less likely to fail? 164 */ 165 error = sysctl_lock(l, ls.oldval, savelen); 166 if (error) 167 return (error); 168 169 /* 170 * dispatch request into linux sysctl tree 171 */ 172 error = sysctl_dispatch(&name[0], ls.nlen, 173 ls.oldval, &oldlen, 174 ls.newval, ls.newlen, 175 &name[0], l, &linux_sysctl_root); 176 177 /* 178 * release the sysctl lock 179 */ 180 sysctl_unlock(l); 181 182 /* 183 * reset caller's oldlen, even if we got an error 184 */ 185 if (ls.oldlenp) { 186 nerror = copyout(&oldlen, ls.oldlenp, sizeof(oldlen)); 187 if (error == 0) 188 error = nerror; 189 } 190 191 /* 192 * if the only problem is that we weren't given enough space, 193 * that's an ENOMEM error 194 */ 195 if (error == 0 && ls.oldval != NULL && savelen < oldlen) 196 error = ENOMEM; 197 198 return (error); 199 } 200 201 /* 202 * kernel related system variables under emul.linux in the main sysctl 203 * tree 204 */ 205 SYSCTL_SETUP(sysctl_emul_linux_setup, "sysctl emul.linux subtree setup") 206 { 207 208 sysctl_createv(clog, 0, NULL, NULL, 209 CTLFLAG_PERMANENT, 210 CTLTYPE_NODE, "emul", NULL, 211 NULL, 0, NULL, 0, 212 CTL_EMUL, CTL_EOL); 213 sysctl_createv(clog, 0, NULL, NULL, 214 CTLFLAG_PERMANENT, 215 CTLTYPE_NODE, "linux", 216 SYSCTL_DESCR("Linux emulation settings"), 217 NULL, 0, NULL, 0, 218 CTL_EMUL, EMUL_LINUX, CTL_EOL); 219 sysctl_createv(clog, 0, NULL, NULL, 220 CTLFLAG_PERMANENT, 221 CTLTYPE_NODE, "kern", 222 SYSCTL_DESCR("Linux kernel emulation settings"), 223 NULL, 0, NULL, 0, 224 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, CTL_EOL); 225 226 sysctl_createv(clog, 0, NULL, NULL, 227 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 228 CTLTYPE_STRING, "ostype", 229 SYSCTL_DESCR("Linux operating system type"), 230 NULL, 0, linux_sysname, sizeof(linux_sysname), 231 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 232 EMUL_LINUX_KERN_OSTYPE, CTL_EOL); 233 sysctl_createv(clog, 0, NULL, NULL, 234 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 235 CTLTYPE_STRING, "osrelease", 236 SYSCTL_DESCR("Linux operating system release"), 237 NULL, 0, linux_release, sizeof(linux_release), 238 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 239 EMUL_LINUX_KERN_OSRELEASE, CTL_EOL); 240 sysctl_createv(clog, 0, NULL, NULL, 241 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 242 CTLTYPE_STRING, "osversion", 243 SYSCTL_DESCR("Linux operating system revision"), 244 NULL, 0, linux_version, sizeof(linux_version), 245 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 246 EMUL_LINUX_KERN_VERSION, CTL_EOL); 247 } 248