1 /* $NetBSD: linux_sysctl.c,v 1.40 2010/07/07 01:30:35 chs 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 1.40 2010/07/07 01:30:35 chs 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 char linux_release[128] = "2.6.18"; 61 char linux_version[128] = "#0 Wed Mar 3 03:03:03 PST 2010"; 62 63 struct sysctlnode linux_sysctl_root = { 64 .sysctl_flags = SYSCTL_VERSION| 65 CTLFLAG_ROOT|CTLTYPE_NODE|CTLFLAG_READWRITE, 66 .sysctl_num = 0, 67 .sysctl_name = "(linux_root)", 68 sysc_init_field(_sysctl_size, sizeof(struct sysctlnode)), 69 }; 70 71 static struct sysctllog *linux_clog1; 72 static struct sysctllog *linux_clog2; 73 74 void 75 linux_sysctl_fini(void) 76 { 77 78 sysctl_teardown(&linux_clog2); 79 sysctl_teardown(&linux_clog1); 80 sysctl_free(&linux_sysctl_root); 81 } 82 83 void 84 linux_sysctl_init(void) 85 { 86 const struct sysctlnode *node = &linux_sysctl_root; 87 88 sysctl_createv(&linux_clog1, 0, &node, &node, 89 CTLFLAG_PERMANENT, 90 CTLTYPE_NODE, "kern", NULL, 91 NULL, 0, NULL, 0, 92 LINUX_CTL_KERN, CTL_EOL); 93 sysctl_createv(&linux_clog1, 0, &node, NULL, 94 CTLFLAG_PERMANENT, 95 CTLTYPE_STRING, "ostype", NULL, 96 NULL, 0, linux_sysname, sizeof(linux_sysname), 97 LINUX_KERN_OSTYPE, CTL_EOL); 98 sysctl_createv(&linux_clog1, 0, &node, NULL, 99 CTLFLAG_PERMANENT, 100 CTLTYPE_STRING, "osrelease", NULL, 101 NULL, 0, linux_release, sizeof(linux_release), 102 LINUX_KERN_OSRELEASE, CTL_EOL); 103 sysctl_createv(&linux_clog1, 0, &node, NULL, 104 CTLFLAG_PERMANENT, 105 CTLTYPE_STRING, "version", NULL, 106 NULL, 0, linux_version, sizeof(linux_version), 107 LINUX_KERN_VERSION, CTL_EOL); 108 109 sysctl_createv(&linux_clog2, 0, NULL, NULL, 110 CTLFLAG_PERMANENT, 111 CTLTYPE_NODE, "emul", NULL, 112 NULL, 0, NULL, 0, 113 CTL_EMUL, CTL_EOL); 114 sysctl_createv(&linux_clog2, 0, NULL, NULL, 115 CTLFLAG_PERMANENT, 116 CTLTYPE_NODE, "linux", 117 SYSCTL_DESCR("Linux emulation settings"), 118 NULL, 0, NULL, 0, 119 CTL_EMUL, EMUL_LINUX, CTL_EOL); 120 sysctl_createv(&linux_clog2, 0, NULL, NULL, 121 CTLFLAG_PERMANENT, 122 CTLTYPE_NODE, "kern", 123 SYSCTL_DESCR("Linux kernel emulation settings"), 124 NULL, 0, NULL, 0, 125 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, CTL_EOL); 126 sysctl_createv(&linux_clog2, 0, NULL, NULL, 127 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 128 CTLTYPE_STRING, "ostype", 129 SYSCTL_DESCR("Linux operating system type"), 130 NULL, 0, linux_sysname, sizeof(linux_sysname), 131 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 132 EMUL_LINUX_KERN_OSTYPE, CTL_EOL); 133 sysctl_createv(&linux_clog2, 0, NULL, NULL, 134 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 135 CTLTYPE_STRING, "osrelease", 136 SYSCTL_DESCR("Linux operating system release"), 137 NULL, 0, linux_release, sizeof(linux_release), 138 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 139 EMUL_LINUX_KERN_OSRELEASE, CTL_EOL); 140 sysctl_createv(&linux_clog2, 0, NULL, NULL, 141 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 142 CTLTYPE_STRING, "osversion", 143 SYSCTL_DESCR("Linux operating system revision"), 144 NULL, 0, linux_version, sizeof(linux_version), 145 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 146 EMUL_LINUX_KERN_VERSION, CTL_EOL); 147 148 linux_sysctl_root.sysctl_flags &= ~CTLFLAG_READWRITE; 149 } 150 151 /* 152 * linux sysctl system call 153 */ 154 int 155 linux_sys___sysctl(struct lwp *l, const struct linux_sys___sysctl_args *uap, register_t *retval) 156 { 157 struct linux___sysctl ls; 158 int error, nerror, name[CTL_MAXNAME]; 159 size_t savelen = 0, oldlen = 0; 160 161 /* 162 * get linux args structure 163 */ 164 if ((error = copyin(SCARG(uap, lsp), &ls, sizeof(ls)))) 165 return error; 166 167 /* 168 * get oldlen 169 */ 170 oldlen = 0; 171 if (ls.oldlenp != NULL) { 172 error = copyin(ls.oldlenp, &oldlen, sizeof(oldlen)); 173 if (error) 174 return (error); 175 } 176 savelen = oldlen; 177 178 /* 179 * top-level sysctl names may or may not be non-terminal, but 180 * we don't care 181 */ 182 if (ls.nlen > CTL_MAXNAME || ls.nlen < 1) 183 return (ENOTDIR); 184 error = copyin(ls.name, &name, ls.nlen * sizeof(int)); 185 if (error) 186 return (error); 187 188 ktrmib(name, ls.nlen); 189 190 /* 191 * dispatch request into linux sysctl tree 192 */ 193 sysctl_lock(ls.newval != NULL); 194 error = sysctl_dispatch(&name[0], ls.nlen, 195 ls.oldval, &oldlen, 196 ls.newval, ls.newlen, 197 &name[0], l, &linux_sysctl_root); 198 sysctl_unlock(); 199 200 /* 201 * reset caller's oldlen, even if we got an error 202 */ 203 if (ls.oldlenp) { 204 nerror = copyout(&oldlen, ls.oldlenp, sizeof(oldlen)); 205 if (error == 0) 206 error = nerror; 207 } 208 209 /* 210 * if the only problem is that we weren't given enough space, 211 * that's an ENOMEM error 212 */ 213 if (error == 0 && ls.oldval != NULL && savelen < oldlen) 214 error = ENOMEM; 215 216 return (error); 217 } 218