1 /* $NetBSD: freebsd_sysctl.c,v 1.14 2008/04/28 20:23:41 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 2005 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * FreeBSD compatibility module. Try to deal with various FreeBSD sysctl calls. 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: freebsd_sysctl.c,v 1.14 2008/04/28 20:23:41 martin Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/proc.h> 39 #include <sys/mount.h> 40 #include <sys/signal.h> 41 #include <sys/signalvar.h> 42 #include <sys/malloc.h> 43 #include <sys/mman.h> 44 #include <sys/sysctl.h> 45 #include <sys/ktrace.h> 46 47 #include <sys/syscallargs.h> 48 49 #include <compat/freebsd/freebsd_syscallargs.h> 50 #include <compat/common/compat_util.h> 51 #include <compat/freebsd/freebsd_rtprio.h> 52 #include <compat/freebsd/freebsd_timex.h> 53 #include <compat/freebsd/freebsd_signal.h> 54 #include <compat/freebsd/freebsd_mman.h> 55 56 static int freebsd_sysctl_name2oid(char *, int *, int *); 57 58 SYSCTL_SETUP_PROTO(freebsd_sysctl_setup); 59 SYSCTL_SETUP(freebsd_sysctl_setup, "freebsd emulated sysctl setup") 60 { 61 sysctl_createv(clog, 0, NULL, NULL, 62 CTLFLAG_PERMANENT, 63 CTLTYPE_NODE, "kern", NULL, 64 NULL, 0, NULL, 0, 65 CTL_KERN, CTL_EOL); 66 sysctl_createv(clog, 0, NULL, NULL, 67 CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE, 68 CTLTYPE_INT, "osreldate", 69 SYSCTL_DESCR("Operating system revision"), 70 NULL, __NetBSD_Version__, NULL, 0, 71 CTL_KERN, CTL_CREATE, CTL_EOL); 72 } 73 74 int 75 freebsd_sys_sysctl(struct lwp *l, const struct freebsd_sys_sysctl_args *uap, register_t *retval) 76 { 77 /* { 78 syscallarg(int *) name; 79 syscallarg(u_int) namelen; 80 syscallarg(void *) old; 81 syscallarg(size_t *) oldlenp; 82 syscallarg(void *) new; 83 syscallarg(size_t) newlen; 84 } */ 85 int error; 86 int name[CTL_MAXNAME]; 87 size_t newlen, *oldlenp; 88 u_int namelen; 89 void *new, *old; 90 91 namelen = SCARG(uap, namelen); 92 93 if ((namelen > CTL_MAXNAME) || (namelen < 1)) 94 return EINVAL; 95 96 if ((error = copyin(SCARG(uap, name), name, 97 namelen * sizeof(*name))) != 0) 98 return error; 99 100 if (namelen > 0 && name[0] != 0) 101 return(sys___sysctl(l, (const void *)uap, retval)); 102 103 ktrmib(name, namelen); 104 105 /* 106 * FreeBSD sysctl uses an undocumented set of special OIDs in it's 107 * sysctl MIB whose tree is rooted at oid 0. These OIDs are 108 * interpretted by their sysctl to implement functions that NetBSD 109 * performs in libc, such as sysctlgetmibinfo. 110 * 111 * From the FreeBSD kern_sysctl.c, these OIDs are: 112 * {0,0} printf the entire MIB-tree. 113 * {0,1,...} return the name of the "..." OID. 114 * {0,2,...} return the next OID. 115 * {0,3} return the OID of the name in "new" 116 * {0,4,...} return the kind & format info for the "..." OID. 117 * {0,5,...} return the description the "..." OID. 118 * 119 * Only implement {0,3} for now. 120 */ 121 122 if (namelen < 2 || namelen > CTL_MAXNAME) 123 return(EINVAL); 124 125 if (name[1] == 3) { 126 char *locnew; 127 int oid[CTL_MAXNAME]; 128 u_int oidlen = CTL_MAXNAME; 129 130 new = SCARG(uap, new); 131 newlen = SCARG(uap, newlen); 132 if (new == NULL || newlen < 1 || 133 newlen > (SYSCTL_NAMELEN * CTL_MAXNAME)) 134 return(EINVAL); 135 136 old = SCARG(uap, old); 137 oldlenp = SCARG(uap, oldlenp); 138 if (old == NULL || oldlenp == NULL || *oldlenp < sizeof(int)) 139 return(EINVAL); 140 141 if ((locnew = 142 (char *) malloc(newlen + 1, M_TEMP, M_WAITOK)) == NULL) 143 return(ENOMEM); 144 145 if ((error = copyinstr(new, locnew, newlen + 1, NULL))) { 146 free(locnew, M_TEMP); 147 return(error); 148 } 149 150 ktrmibio(-1, UIO_WRITE, new, newlen + 1, error); 151 sysctl_lock(new != NULL); 152 error = freebsd_sysctl_name2oid(locnew, oid, &oidlen); 153 sysctl_unlock(); 154 free(locnew, M_TEMP); 155 if (error) 156 return(error); 157 158 oidlen *= sizeof(int); 159 error = copyout(oid, SCARG(uap, old), 160 MIN(oidlen, *SCARG(uap, oldlenp))); 161 if (error) 162 return(error); 163 ktrmibio(-1, UIO_READ, SCARG(uap, old), 164 MIN(oidlen, *SCARG(uap, oldlenp)), 0); 165 166 error = copyout(&oidlen, SCARG(uap, oldlenp), sizeof(u_int)); 167 168 return(error); 169 } 170 171 return(EOPNOTSUPP); 172 } 173 174 static int 175 freebsd_sysctl_name2oid(char *name, int *oid, int *oidlen) 176 { 177 char *dot; 178 int oi, ci; 179 struct sysctlnode *node, *pnode; 180 181 pnode = &sysctl_root; 182 node = sysctl_root.sysctl_child; 183 oi = 0; 184 if ((dot = strchr(name, (int)'.')) != NULL) 185 *dot++ = '\0'; 186 187 next: 188 while (*name != '\0' && node != NULL) { 189 for (ci = 0; ci < pnode->sysctl_clen; ci++) { 190 if (strcmp(name, node[ci].sysctl_name) == 0) { 191 oid[oi++] = node[ci].sysctl_num; 192 if ((name = dot) == NULL) { 193 *oidlen = oi; 194 return(0); 195 } 196 if ((dot = strchr(name, (int)'.')) != NULL) 197 *dot++ = '\0'; 198 199 if (SYSCTL_TYPE(node[ci].sysctl_flags) != 200 CTLTYPE_NODE) 201 return(ENOTDIR); 202 203 pnode = &node[ci]; 204 node = pnode->sysctl_child; 205 goto next; 206 } 207 } 208 209 /* no more nodes, it must not exist */ 210 break; 211 } 212 213 return(ENOENT); 214 } 215