Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/common/linux_sysctl.c
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1 /* $NetBSD: linux_sysctl.c,v 1.13.2.3 2004/05/26 20:06:30 he 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 1.13.2.3 2004/05/26 20:06:30 he 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 #ifndef _LKM 72 static 73 #endif 74 struct sysctlnode linux_sysctl_root = { 75 .sysctl_flags = SYSCTL_VERSION| 76 CTLFLAG_ROOT|CTLTYPE_NODE|CTLFLAG_READWRITE, 77 .sysctl_num = 0, 78 .sysctl_name = "(linux_root)", 79 sysc_init_field(_sysctl_size, sizeof(struct sysctlnode)), 80 }; 81 82 /* 83 * setup for small sysctl tree used by emulation 84 */ 85 SYSCTL_SETUP(linux_sysctl_setup, "linux emulated sysctl subtree setup") 86 { 87 struct sysctlnode *node = &linux_sysctl_root; 88 89 sysctl_createv(clog, 0, &node, &node, 90 CTLFLAG_PERMANENT, 91 CTLTYPE_NODE, "kern", NULL, 92 NULL, 0, NULL, 0, 93 LINUX_CTL_KERN, CTL_EOL); 94 95 sysctl_createv(clog, 0, &node, NULL, 96 CTLFLAG_PERMANENT, 97 CTLTYPE_STRING, "ostype", NULL, 98 NULL, 0, linux_sysname, sizeof(linux_sysname), 99 LINUX_KERN_OSTYPE, CTL_EOL); 100 sysctl_createv(clog, 0, &node, NULL, 101 CTLFLAG_PERMANENT, 102 CTLTYPE_STRING, "osrelease", NULL, 103 NULL, 0, linux_release, sizeof(linux_release), 104 LINUX_KERN_OSRELEASE, CTL_EOL); 105 sysctl_createv(clog, 0, &node, NULL, 106 CTLFLAG_PERMANENT, 107 CTLTYPE_STRING, "version", NULL, 108 NULL, 0, linux_version, sizeof(linux_version), 109 LINUX_KERN_VERSION, CTL_EOL); 110 111 linux_sysctl_root.sysctl_flags &= ~CTLFLAG_READWRITE; 112 } 113 114 /* 115 * linux sysctl system call 116 */ 117 int 118 linux_sys___sysctl(struct lwp *l, void *v, register_t *retval) 119 { 120 struct linux_sys___sysctl_args *uap = v; 121 struct linux___sysctl ls; 122 int error, nerror, name[CTL_MAXNAME]; 123 size_t savelen = 0, oldlen = 0; 124 125 /* 126 * get linux args structure 127 */ 128 if ((error = copyin(SCARG(uap, lsp), &ls, sizeof(ls)))) 129 return error; 130 131 /* 132 * get oldlen 133 */ 134 oldlen = 0; 135 if (ls.oldlenp != NULL) { 136 error = copyin(ls.oldlenp, &oldlen, sizeof(oldlen)); 137 if (error) 138 return (error); 139 } 140 savelen = oldlen; 141 142 /* 143 * top-level sysctl names may or may not be non-terminal, but 144 * we don't care 145 */ 146 if (ls.nlen > CTL_MAXNAME || ls.nlen < 1) 147 return (EINVAL); 148 error = copyin(ls.name, &name, ls.nlen * sizeof(int)); 149 if (error) 150 return (error); 151 152 /* 153 * wire old so that copyout() is less likely to fail? 154 */ 155 error = sysctl_lock(l, ls.oldval, savelen); 156 if (error) 157 return (error); 158 159 /* 160 * dispatch request into linux sysctl tree 161 */ 162 error = sysctl_dispatch(&name[0], ls.nlen, 163 ls.oldval, &oldlen, 164 ls.newval, ls.newlen, 165 &name[0], l, &linux_sysctl_root); 166 167 /* 168 * release the sysctl lock 169 */ 170 sysctl_unlock(l); 171 172 /* 173 * reset caller's oldlen, even if we got an error 174 */ 175 if (ls.oldlenp) { 176 nerror = copyout(&oldlen, ls.oldlenp, sizeof(oldlen)); 177 if (error == 0) 178 error = nerror; 179 } 180 181 /* 182 * if the only problem is that we weren't given enough space, 183 * that's an ENOMEM error 184 */ 185 if (error == 0 && ls.oldval != NULL && savelen < oldlen) 186 error = ENOMEM; 187 188 return (error); 189 } 190 191 /* 192 * kernel related system variables under emul.linux in the main sysctl 193 * tree 194 */ 195 SYSCTL_SETUP(sysctl_emul_linux_setup, "sysctl emul.linux subtree setup") 196 { 197 198 sysctl_createv(clog, 0, NULL, NULL, 199 CTLFLAG_PERMANENT, 200 CTLTYPE_NODE, "emul", NULL, 201 NULL, 0, NULL, 0, 202 CTL_EMUL, CTL_EOL); 203 sysctl_createv(clog, 0, NULL, NULL, 204 CTLFLAG_PERMANENT, 205 CTLTYPE_NODE, "linux", 206 SYSCTL_DESCR("Linux emulation settings"), 207 NULL, 0, NULL, 0, 208 CTL_EMUL, EMUL_LINUX, CTL_EOL); 209 sysctl_createv(clog, 0, NULL, NULL, 210 CTLFLAG_PERMANENT, 211 CTLTYPE_NODE, "kern", 212 SYSCTL_DESCR("Linux kernel emulation settings"), 213 NULL, 0, NULL, 0, 214 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, CTL_EOL); 215 216 sysctl_createv(clog, 0, NULL, NULL, 217 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 218 CTLTYPE_STRING, "ostype", 219 SYSCTL_DESCR("Linux operating system type"), 220 NULL, 0, linux_sysname, sizeof(linux_sysname), 221 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 222 EMUL_LINUX_KERN_OSTYPE, CTL_EOL); 223 sysctl_createv(clog, 0, NULL, NULL, 224 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 225 CTLTYPE_STRING, "osrelease", 226 SYSCTL_DESCR("Linux operating system release"), 227 NULL, 0, linux_release, sizeof(linux_release), 228 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 229 EMUL_LINUX_KERN_OSRELEASE, CTL_EOL); 230 sysctl_createv(clog, 0, NULL, NULL, 231 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 232 CTLTYPE_STRING, "osversion", 233 SYSCTL_DESCR("Linux operating system revision"), 234 NULL, 0, linux_version, sizeof(linux_version), 235 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 236 EMUL_LINUX_KERN_VERSION, CTL_EOL); 237 }
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