1 /* $NetBSD: linux_sysctl.c,v 1.11 2003/12/04 19:38:23 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 1.11 2003/12/04 19:38:23 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_ROOT|CTLTYPE_NODE, 73 .sysctl_num = 0, 74 .sysctl_size = sizeof(struct sysctlnode), 75 .sysctl_name = "(linux_root)", 76 }; 77 78 /* 79 * setup for small sysctl tree used by emulation 80 */ 81 SYSCTL_SETUP(linux_sysctl_setup, "linux emulated sysctl subtree setup") 82 { 83 struct sysctlnode *rnode, *node; 84 85 rnode = &linux_sysctl_root; 86 sysctl_createv(SYSCTL_PERMANENT, 87 CTLTYPE_NODE, "kern", &rnode, 88 NULL, 0, NULL, 0, 89 LINUX_CTL_KERN, CTL_EOL); 90 91 node = rnode; 92 sysctl_createv(SYSCTL_PERMANENT, 93 CTLTYPE_STRING, "ostype", &node, 94 NULL, 0, linux_sysname, sizeof(linux_sysname), 95 LINUX_KERN_OSTYPE, CTL_EOL); 96 node = rnode; 97 sysctl_createv(SYSCTL_PERMANENT, 98 CTLTYPE_STRING, "osrelease", &node, 99 NULL, 0, linux_release, sizeof(linux_release), 100 LINUX_KERN_OSRELEASE, CTL_EOL); 101 node = rnode; 102 sysctl_createv(SYSCTL_PERMANENT, 103 CTLTYPE_STRING, "version", &node, 104 NULL, 0, linux_version, sizeof(linux_version), 105 LINUX_KERN_VERSION, CTL_EOL); 106 } 107 108 /* 109 * linux sysctl system call 110 */ 111 int 112 linux_sys___sysctl(struct lwp *l, void *v, register_t *retval) 113 { 114 struct linux_sys___sysctl_args *uap = v; 115 struct linux___sysctl ls; 116 int error, nerror, name[CTL_MAXNAME]; 117 size_t savelen = 0, oldlen = 0; 118 119 /* 120 * get linux args structure 121 */ 122 if ((error = copyin(SCARG(uap, lsp), &ls, sizeof(ls)))) 123 return error; 124 125 /* 126 * get oldlen 127 */ 128 oldlen = 0; 129 if (ls.oldlenp != NULL) { 130 error = copyin(ls.oldlenp, &oldlen, sizeof(oldlen)); 131 if (error) 132 return (error); 133 } 134 savelen = oldlen; 135 136 /* 137 * top-level sysctl names may or may not be non-terminal, but 138 * we don't care 139 */ 140 if (ls.nlen > CTL_MAXNAME || ls.nlen < 1) 141 return (EINVAL); 142 error = copyin(ls.name, &name, ls.nlen * sizeof(int)); 143 if (error) 144 return (error); 145 146 /* 147 * wire old so that copyout() is less likely to fail? 148 */ 149 error = sysctl_lock(l, ls.oldval, savelen); 150 if (error) 151 return (error); 152 153 /* 154 * dispatch request into linux sysctl tree 155 */ 156 error = sysctl_dispatch(&name[0], ls.nlen, 157 ls.oldval, &oldlen, 158 ls.newval, ls.newlen, 159 &name[0], l, &linux_sysctl_root); 160 161 /* 162 * release the sysctl lock 163 */ 164 sysctl_unlock(l); 165 166 /* 167 * lock state should now be only "needlock" and "canwait" 168 */ 169 /* XXX KASSERT */ 170 171 /* 172 * reset caller's oldlen, even if we got an error 173 */ 174 if (ls.oldlenp) { 175 nerror = copyout(&oldlen, ls.oldlenp, sizeof(oldlen)); 176 if (error == 0) 177 error = nerror; 178 } 179 180 /* 181 * if the only problem is that we weren't given enough space, 182 * that's an ENOMEM error 183 */ 184 if (error == 0 && ls.oldval != NULL && savelen < oldlen) 185 error = ENOMEM; 186 187 return (error); 188 } 189 190 /* 191 * kernel related system variables under emul.linux in the main sysctl 192 * tree 193 */ 194 SYSCTL_SETUP(sysctl_emul_linux_setup, "sysctl emul.linux subtree setup") 195 { 196 197 sysctl_createv(SYSCTL_PERMANENT, 198 CTLTYPE_NODE, "emul", NULL, 199 NULL, 0, NULL, 0, 200 CTL_EMUL, CTL_EOL); 201 sysctl_createv(SYSCTL_PERMANENT, 202 CTLTYPE_NODE, "linux", NULL, 203 NULL, 0, NULL, 0, 204 CTL_EMUL, EMUL_LINUX, CTL_EOL); 205 sysctl_createv(SYSCTL_PERMANENT, 206 CTLTYPE_NODE, "kern", NULL, 207 NULL, 0, NULL, 0, 208 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, CTL_EOL); 209 210 sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE, 211 CTLTYPE_STRING, "ostype", NULL, 212 NULL, 0, linux_sysname, sizeof(linux_sysname), 213 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 214 EMUL_LINUX_KERN_OSTYPE, CTL_EOL); 215 sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE, 216 CTLTYPE_STRING, "osrelease", NULL, 217 NULL, 0, linux_release, sizeof(linux_release), 218 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 219 EMUL_LINUX_KERN_OSRELEASE, CTL_EOL); 220 sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE, 221 CTLTYPE_STRING, "osversion", NULL, 222 NULL, 0, linux_version, sizeof(linux_version), 223 CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, 224 EMUL_LINUX_KERN_VERSION, CTL_EOL); 225 } 226