linux_sysctl.c revision 1.38
1 /* $NetBSD: linux_sysctl.c,v 1.38 2008/11/19 18:36:03 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 2003, 2008 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 1.38 2008/11/19 18:36:03 ad 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 struct sysctlnode linux_sysctl_root = { 69 .sysctl_flags = SYSCTL_VERSION| 70 CTLFLAG_ROOT|CTLTYPE_NODE|CTLFLAG_READWRITE, 71 .sysctl_num = 0, 72 .sysctl_name = "(linux_root)", 73 sysc_init_field(_sysctl_size, sizeof(struct sysctlnode)), 74 }; 75 76 static struct sysctllog *linux_clog1; 77 static struct sysctllog *linux_clog2; 78 79 void 80 linux_sysctl_fini(void) 81 { 82 83 sysctl_teardown(&linux_clog2); 84 sysctl_teardown(&linux_clog1); 85 sysctl_free(&linux_sysctl_root); 86 } 87 88 void 89 linux_sysctl_init(void) 90 { 91 const struct sysctlnode *node = &linux_sysctl_root; 92 93 sysctl_createv(&linux_clog1, 0, &node, &node, 94 CTLFLAG_PERMANENT, 95 CTLTYPE_NODE, "kern", NULL, 96 NULL, 0, NULL, 0, 97 LINUX_CTL_KERN, CTL_EOL); 98 sysctl_createv(&linux_clog1, 0, &node, NULL, 99 CTLFLAG_PERMANENT, 100 CTLTYPE_STRING, "ostype", NULL, 101 NULL, 0, linux_sysname, sizeof(linux_sysname), 102 LINUX_KERN_OSTYPE, CTL_EOL); 103 sysctl_createv(&linux_clog1, 0, &node, NULL, 104 CTLFLAG_PERMANENT, 105 CTLTYPE_STRING, "osrelease", NULL, 106 NULL, 0, linux_release, sizeof(linux_release), 107 LINUX_KERN_OSRELEASE, CTL_EOL); 108 sysctl_createv(&linux_clog1, 0, &node, NULL, 109 CTLFLAG_PERMANENT, 110 CTLTYPE_STRING, "version", NULL, 111 NULL, 0, linux_version, sizeof(linux_version), 112 LINUX_KERN_VERSION, CTL_EOL); 113 114 sysctl_createv(&linux_clog2, 0, NULL, NULL, 115 CTLFLAG_PERMANENT, 116 CTLTYPE_NODE, "emul", NULL, 117 NULL, 0, NULL, 0, 118 CTL_EMUL, CTL_EOL); 119 sysctl_createv(&linux_clog2, 0, NULL, NULL, 120 CTLFLAG_PERMANENT, 121 CTLTYPE_NODE, "linux", 122 SYSCTL_DESCR("Linux emulation settings"), 123 NULL, 0, NULL, 0, 124 CTL_EMUL, EMUL_LINUX, CTL_EOL); 125 sysctl_createv(&linux_clog2, 0, NULL, NULL, 126 CTLFLAG_PERMANENT, 127 CTLTYPE_NODE, "kern", 128 SYSCTL_DESCR("Linux kernel emulation settings"), 129 NULL, 0, NULL, 0, 130 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, CTL_EOL); 131 sysctl_createv(&linux_clog2, 0, NULL, NULL, 132 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 133 CTLTYPE_STRING, "ostype", 134 SYSCTL_DESCR("Linux operating system type"), 135 NULL, 0, linux_sysname, sizeof(linux_sysname), 136 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 137 EMUL_LINUX_KERN_OSTYPE, CTL_EOL); 138 sysctl_createv(&linux_clog2, 0, NULL, NULL, 139 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 140 CTLTYPE_STRING, "osrelease", 141 SYSCTL_DESCR("Linux operating system release"), 142 NULL, 0, linux_release, sizeof(linux_release), 143 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 144 EMUL_LINUX_KERN_OSRELEASE, CTL_EOL); 145 sysctl_createv(&linux_clog2, 0, NULL, NULL, 146 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 147 CTLTYPE_STRING, "osversion", 148 SYSCTL_DESCR("Linux operating system revision"), 149 NULL, 0, linux_version, sizeof(linux_version), 150 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 151 EMUL_LINUX_KERN_VERSION, CTL_EOL); 152 153 linux_sysctl_root.sysctl_flags &= ~CTLFLAG_READWRITE; 154 } 155 156 /* 157 * linux sysctl system call 158 */ 159 int 160 linux_sys___sysctl(struct lwp *l, const struct linux_sys___sysctl_args *uap, register_t *retval) 161 { 162 struct linux___sysctl ls; 163 int error, nerror, name[CTL_MAXNAME]; 164 size_t savelen = 0, oldlen = 0; 165 166 /* 167 * get linux args structure 168 */ 169 if ((error = copyin(SCARG(uap, lsp), &ls, sizeof(ls)))) 170 return error; 171 172 /* 173 * get oldlen 174 */ 175 oldlen = 0; 176 if (ls.oldlenp != NULL) { 177 error = copyin(ls.oldlenp, &oldlen, sizeof(oldlen)); 178 if (error) 179 return (error); 180 } 181 savelen = oldlen; 182 183 /* 184 * top-level sysctl names may or may not be non-terminal, but 185 * we don't care 186 */ 187 if (ls.nlen > CTL_MAXNAME || ls.nlen < 1) 188 return (EINVAL); 189 error = copyin(ls.name, &name, ls.nlen * sizeof(int)); 190 if (error) 191 return (error); 192 193 ktrmib(name, ls.nlen); 194 195 /* 196 * dispatch request into linux sysctl tree 197 */ 198 sysctl_lock(ls.newval != NULL); 199 error = sysctl_dispatch(&name[0], ls.nlen, 200 ls.oldval, &oldlen, 201 ls.newval, ls.newlen, 202 &name[0], l, &linux_sysctl_root); 203 sysctl_unlock(); 204 205 /* 206 * reset caller's oldlen, even if we got an error 207 */ 208 if (ls.oldlenp) { 209 nerror = copyout(&oldlen, ls.oldlenp, sizeof(oldlen)); 210 if (error == 0) 211 error = nerror; 212 } 213 214 /* 215 * if the only problem is that we weren't given enough space, 216 * that's an ENOMEM error 217 */ 218 if (error == 0 && ls.oldval != NULL && savelen < oldlen) 219 error = ENOMEM; 220 221 return (error); 222 } 223
Indexes created Sat Sep 27 14:09:57 GMT 2025