linux_sysctl.c revision 1.19.12.2
1 /* $NetBSD: linux_sysctl.c,v 1.19.12.2 2006/12/10 07:16:48 yamt 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 1.19.12.2 2006/12/10 07:16:48 yamt 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/sa.h> 57 #include <sys/syscallargs.h> 58 #ifdef KTRACE 59 #include <sys/ktrace.h> 60 #endif 61 62 #include <compat/linux/common/linux_types.h> 63 #include <compat/linux/common/linux_signal.h> 64 65 #include <compat/linux/linux_syscallargs.h> 66 #include <compat/linux/common/linux_sysctl.h> 67 #include <compat/linux/common/linux_exec.h> 68 69 char linux_sysname[128] = "Linux"; 70 #if defined(__amd64__) || defined(__i386__) || defined(__powerpc__) 71 char linux_release[128] = "2.4.18"; 72 char linux_version[128] = "#0 Wed Feb 20 20:00:02 CET 2002"; 73 #else 74 char linux_release[128] = "2.0.38"; 75 char linux_version[128] = "#0 Sun Nov 11 11:11:11 MET 2000"; 76 #endif 77 78 #ifndef _LKM 79 static 80 #endif 81 struct sysctlnode linux_sysctl_root = { 82 .sysctl_flags = SYSCTL_VERSION| 83 CTLFLAG_ROOT|CTLTYPE_NODE|CTLFLAG_READWRITE, 84 .sysctl_num = 0, 85 .sysctl_name = "(linux_root)", 86 sysc_init_field(_sysctl_size, sizeof(struct sysctlnode)), 87 }; 88 89 /* 90 * setup for small sysctl tree used by emulation 91 */ 92 SYSCTL_SETUP(linux_sysctl_setup, "linux emulated sysctl subtree setup") 93 { 94 const struct sysctlnode *node = &linux_sysctl_root; 95 96 sysctl_createv(clog, 0, &node, &node, 97 CTLFLAG_PERMANENT, 98 CTLTYPE_NODE, "kern", NULL, 99 NULL, 0, NULL, 0, 100 LINUX_CTL_KERN, CTL_EOL); 101 102 sysctl_createv(clog, 0, &node, NULL, 103 CTLFLAG_PERMANENT, 104 CTLTYPE_STRING, "ostype", NULL, 105 NULL, 0, linux_sysname, sizeof(linux_sysname), 106 LINUX_KERN_OSTYPE, CTL_EOL); 107 sysctl_createv(clog, 0, &node, NULL, 108 CTLFLAG_PERMANENT, 109 CTLTYPE_STRING, "osrelease", NULL, 110 NULL, 0, linux_release, sizeof(linux_release), 111 LINUX_KERN_OSRELEASE, CTL_EOL); 112 sysctl_createv(clog, 0, &node, NULL, 113 CTLFLAG_PERMANENT, 114 CTLTYPE_STRING, "version", NULL, 115 NULL, 0, linux_version, sizeof(linux_version), 116 LINUX_KERN_VERSION, CTL_EOL); 117 118 linux_sysctl_root.sysctl_flags &= ~CTLFLAG_READWRITE; 119 } 120 121 /* 122 * linux sysctl system call 123 */ 124 int 125 linux_sys___sysctl(struct lwp *l, void *v, register_t *retval) 126 { 127 struct linux_sys___sysctl_args *uap = v; 128 struct linux___sysctl ls; 129 int error, nerror, name[CTL_MAXNAME]; 130 size_t savelen = 0, oldlen = 0; 131 132 /* 133 * get linux args structure 134 */ 135 if ((error = copyin(SCARG(uap, lsp), &ls, sizeof(ls)))) 136 return error; 137 138 /* 139 * get oldlen 140 */ 141 oldlen = 0; 142 if (ls.oldlenp != NULL) { 143 error = copyin(ls.oldlenp, &oldlen, sizeof(oldlen)); 144 if (error) 145 return (error); 146 } 147 savelen = oldlen; 148 149 /* 150 * top-level sysctl names may or may not be non-terminal, but 151 * we don't care 152 */ 153 if (ls.nlen > CTL_MAXNAME || ls.nlen < 1) 154 return (EINVAL); 155 error = copyin(ls.name, &name, ls.nlen * sizeof(int)); 156 if (error) 157 return (error); 158 159 #ifdef KTRACE 160 if (KTRPOINT(l->l_proc, KTR_MIB)) 161 ktrmib(l, name, ls.nlen); 162 #endif 163 /* 164 * wire old so that copyout() is less likely to fail? 165 */ 166 error = sysctl_lock(l, ls.oldval, savelen); 167 if (error) 168 return (error); 169 170 /* 171 * dispatch request into linux sysctl tree 172 */ 173 error = sysctl_dispatch(&name[0], ls.nlen, 174 ls.oldval, &oldlen, 175 ls.newval, ls.newlen, 176 &name[0], l, &linux_sysctl_root); 177 178 /* 179 * release the sysctl lock 180 */ 181 sysctl_unlock(l); 182 183 /* 184 * reset caller's oldlen, even if we got an error 185 */ 186 if (ls.oldlenp) { 187 nerror = copyout(&oldlen, ls.oldlenp, sizeof(oldlen)); 188 if (error == 0) 189 error = nerror; 190 } 191 192 /* 193 * if the only problem is that we weren't given enough space, 194 * that's an ENOMEM error 195 */ 196 if (error == 0 && ls.oldval != NULL && savelen < oldlen) 197 error = ENOMEM; 198 199 return (error); 200 } 201 202 /* 203 * kernel related system variables under emul.linux in the main sysctl 204 * tree 205 */ 206 SYSCTL_SETUP(sysctl_emul_linux_setup, "sysctl emul.linux subtree setup") 207 { 208 209 sysctl_createv(clog, 0, NULL, NULL, 210 CTLFLAG_PERMANENT, 211 CTLTYPE_NODE, "emul", NULL, 212 NULL, 0, NULL, 0, 213 CTL_EMUL, CTL_EOL); 214 sysctl_createv(clog, 0, NULL, NULL, 215 CTLFLAG_PERMANENT, 216 CTLTYPE_NODE, "linux", 217 SYSCTL_DESCR("Linux emulation settings"), 218 NULL, 0, NULL, 0, 219 CTL_EMUL, EMUL_LINUX, CTL_EOL); 220 sysctl_createv(clog, 0, NULL, NULL, 221 CTLFLAG_PERMANENT, 222 CTLTYPE_NODE, "kern", 223 SYSCTL_DESCR("Linux kernel emulation settings"), 224 NULL, 0, NULL, 0, 225 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, CTL_EOL); 226 227 sysctl_createv(clog, 0, NULL, NULL, 228 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 229 CTLTYPE_STRING, "ostype", 230 SYSCTL_DESCR("Linux operating system type"), 231 NULL, 0, linux_sysname, sizeof(linux_sysname), 232 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 233 EMUL_LINUX_KERN_OSTYPE, CTL_EOL); 234 sysctl_createv(clog, 0, NULL, NULL, 235 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 236 CTLTYPE_STRING, "osrelease", 237 SYSCTL_DESCR("Linux operating system release"), 238 NULL, 0, linux_release, sizeof(linux_release), 239 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 240 EMUL_LINUX_KERN_OSRELEASE, CTL_EOL); 241 sysctl_createv(clog, 0, NULL, NULL, 242 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 243 CTLTYPE_STRING, "osversion", 244 SYSCTL_DESCR("Linux operating system revision"), 245 NULL, 0, linux_version, sizeof(linux_version), 246 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 247 EMUL_LINUX_KERN_VERSION, CTL_EOL); 248 } 249
Indexes created Sat Sep 27 14:09:57 GMT 2025