1 /* $NetBSD: linux_sysctl.c,v 1.13 2004/03/24 15:34:52 atatat 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 1.13 2004/03/24 15:34:52 atatat Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/errno.h> 49 #include <sys/proc.h> 50 #include <sys/mount.h> 51 #include <sys/sysctl.h> 52 #include <sys/sa.h> 53 #include <sys/syscallargs.h> 54 55 #include <compat/linux/common/linux_types.h> 56 #include <compat/linux/common/linux_signal.h> 57 58 #include <compat/linux/linux_syscallargs.h> 59 #include <compat/linux/common/linux_sysctl.h> 60 #include <compat/linux/common/linux_exec.h> 61 62 char linux_sysname[128] = "Linux"; 63 #if defined(__i386__) || defined(__powerpc__) 64 char linux_release[128] = "2.4.18"; 65 char linux_version[128] = "#0 Wed Feb 20 20:00:02 CET 2002"; 66 #else 67 char linux_release[128] = "2.0.38"; 68 char linux_version[128] = "#0 Sun Nov 11 11:11:11 MET 2000"; 69 #endif 70 71 static struct sysctlnode linux_sysctl_root = { 72 .sysctl_flags = SYSCTL_VERSION| 73 CTLFLAG_ROOT|CTLTYPE_NODE|CTLFLAG_READWRITE, 74 .sysctl_num = 0, 75 .sysctl_size = sizeof(struct sysctlnode), 76 .sysctl_name = "(linux_root)", 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 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, void *v, register_t *retval) 116 { 117 struct linux_sys___sysctl_args *uap = v; 118 struct linux___sysctl ls; 119 int error, nerror, name[CTL_MAXNAME]; 120 size_t savelen = 0, oldlen = 0; 121 122 /* 123 * get linux args structure 124 */ 125 if ((error = copyin(SCARG(uap, lsp), &ls, sizeof(ls)))) 126 return error; 127 128 /* 129 * get oldlen 130 */ 131 oldlen = 0; 132 if (ls.oldlenp != NULL) { 133 error = copyin(ls.oldlenp, &oldlen, sizeof(oldlen)); 134 if (error) 135 return (error); 136 } 137 savelen = oldlen; 138 139 /* 140 * top-level sysctl names may or may not be non-terminal, but 141 * we don't care 142 */ 143 if (ls.nlen > CTL_MAXNAME || ls.nlen < 1) 144 return (EINVAL); 145 error = copyin(ls.name, &name, ls.nlen * sizeof(int)); 146 if (error) 147 return (error); 148 149 /* 150 * wire old so that copyout() is less likely to fail? 151 */ 152 error = sysctl_lock(l, ls.oldval, savelen); 153 if (error) 154 return (error); 155 156 /* 157 * dispatch request into linux sysctl tree 158 */ 159 error = sysctl_dispatch(&name[0], ls.nlen, 160 ls.oldval, &oldlen, 161 ls.newval, ls.newlen, 162 &name[0], l, &linux_sysctl_root); 163 164 /* 165 * release the sysctl lock 166 */ 167 sysctl_unlock(l); 168 169 /* 170 * reset caller's oldlen, even if we got an error 171 */ 172 if (ls.oldlenp) { 173 nerror = copyout(&oldlen, ls.oldlenp, sizeof(oldlen)); 174 if (error == 0) 175 error = nerror; 176 } 177 178 /* 179 * if the only problem is that we weren't given enough space, 180 * that's an ENOMEM error 181 */ 182 if (error == 0 && ls.oldval != NULL && savelen < oldlen) 183 error = ENOMEM; 184 185 return (error); 186 } 187 188 /* 189 * kernel related system variables under emul.linux in the main sysctl 190 * tree 191 */ 192 SYSCTL_SETUP(sysctl_emul_linux_setup, "sysctl emul.linux subtree setup") 193 { 194 195 sysctl_createv(clog, 0, NULL, NULL, 196 CTLFLAG_PERMANENT, 197 CTLTYPE_NODE, "emul", NULL, 198 NULL, 0, NULL, 0, 199 CTL_EMUL, CTL_EOL); 200 sysctl_createv(clog, 0, NULL, NULL, 201 CTLFLAG_PERMANENT, 202 CTLTYPE_NODE, "linux", NULL, 203 NULL, 0, NULL, 0, 204 CTL_EMUL, EMUL_LINUX, CTL_EOL); 205 sysctl_createv(clog, 0, NULL, NULL, 206 CTLFLAG_PERMANENT, 207 CTLTYPE_NODE, "kern", NULL, 208 NULL, 0, NULL, 0, 209 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, CTL_EOL); 210 211 sysctl_createv(clog, 0, NULL, NULL, 212 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 213 CTLTYPE_STRING, "ostype", NULL, 214 NULL, 0, linux_sysname, sizeof(linux_sysname), 215 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 216 EMUL_LINUX_KERN_OSTYPE, CTL_EOL); 217 sysctl_createv(clog, 0, NULL, NULL, 218 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 219 CTLTYPE_STRING, "osrelease", NULL, 220 NULL, 0, linux_release, sizeof(linux_release), 221 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 222 EMUL_LINUX_KERN_OSRELEASE, CTL_EOL); 223 sysctl_createv(clog, 0, NULL, NULL, 224 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 225 CTLTYPE_STRING, "osversion", NULL, 226 NULL, 0, linux_version, sizeof(linux_version), 227 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 228 EMUL_LINUX_KERN_VERSION, CTL_EOL); 229 } 230