1 /* $NetBSD: freebsd_sysctl.c,v 1.15 2008/11/19 18:36:02 ad 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 1.15 2008/11/19 18:36:02 ad 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 #include <compat/freebsd/freebsd_sysctl.h> 56 57 static int freebsd_sysctl_name2oid(char *, int *, int *); 58 59 static struct sysctllog *freebsd_clog; 60 61 void 62 freebsd_sysctl_init(void) 63 { 64 65 sysctl_createv(&freebsd_clog, 0, NULL, NULL, 66 CTLFLAG_PERMANENT, 67 CTLTYPE_NODE, "kern", NULL, 68 NULL, 0, NULL, 0, 69 CTL_KERN, CTL_EOL); 70 sysctl_createv(&freebsd_clog, 0, NULL, NULL, 71 CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE, 72 CTLTYPE_INT, "osreldate", 73 SYSCTL_DESCR("Operating system revision"), 74 NULL, __NetBSD_Version__, NULL, 0, 75 CTL_KERN, CTL_CREATE, CTL_EOL); 76 } 77 78 void 79 freebsd_sysctl_fini(void) 80 { 81 82 sysctl_teardown(&freebsd_clog); 83 } 84 85 int 86 freebsd_sys_sysctl(struct lwp *l, const struct freebsd_sys_sysctl_args *uap, register_t *retval) 87 { 88 /* { 89 syscallarg(int *) name; 90 syscallarg(u_int) namelen; 91 syscallarg(void *) old; 92 syscallarg(size_t *) oldlenp; 93 syscallarg(void *) new; 94 syscallarg(size_t) newlen; 95 } */ 96 int error; 97 int name[CTL_MAXNAME]; 98 size_t newlen, *oldlenp; 99 u_int namelen; 100 void *new, *old; 101 102 namelen = SCARG(uap, namelen); 103 104 if ((namelen > CTL_MAXNAME) || (namelen < 1)) 105 return EINVAL; 106 107 if ((error = copyin(SCARG(uap, name), name, 108 namelen * sizeof(*name))) != 0) 109 return error; 110 111 if (namelen > 0 && name[0] != 0) 112 return(sys___sysctl(l, (const void *)uap, retval)); 113 114 ktrmib(name, namelen); 115 116 /* 117 * FreeBSD sysctl uses an undocumented set of special OIDs in it's 118 * sysctl MIB whose tree is rooted at oid 0. These OIDs are 119 * interpretted by their sysctl to implement functions that NetBSD 120 * performs in libc, such as sysctlgetmibinfo. 121 * 122 * From the FreeBSD kern_sysctl.c, these OIDs are: 123 * {0,0} printf the entire MIB-tree. 124 * {0,1,...} return the name of the "..." OID. 125 * {0,2,...} return the next OID. 126 * {0,3} return the OID of the name in "new" 127 * {0,4,...} return the kind & format info for the "..." OID. 128 * {0,5,...} return the description the "..." OID. 129 * 130 * Only implement {0,3} for now. 131 */ 132 133 if (namelen < 2 || namelen > CTL_MAXNAME) 134 return(EINVAL); 135 136 if (name[1] == 3) { 137 char *locnew; 138 int oid[CTL_MAXNAME]; 139 u_int oidlen = CTL_MAXNAME; 140 141 new = SCARG(uap, new); 142 newlen = SCARG(uap, newlen); 143 if (new == NULL || newlen < 1 || 144 newlen > (SYSCTL_NAMELEN * CTL_MAXNAME)) 145 return(EINVAL); 146 147 old = SCARG(uap, old); 148 oldlenp = SCARG(uap, oldlenp); 149 if (old == NULL || oldlenp == NULL || *oldlenp < sizeof(int)) 150 return(EINVAL); 151 152 if ((locnew = 153 (char *) malloc(newlen + 1, M_TEMP, M_WAITOK)) == NULL) 154 return(ENOMEM); 155 156 if ((error = copyinstr(new, locnew, newlen + 1, NULL))) { 157 free(locnew, M_TEMP); 158 return(error); 159 } 160 161 ktrmibio(-1, UIO_WRITE, new, newlen + 1, error); 162 sysctl_lock(new != NULL); 163 error = freebsd_sysctl_name2oid(locnew, oid, &oidlen); 164 sysctl_unlock(); 165 free(locnew, M_TEMP); 166 if (error) 167 return(error); 168 169 oidlen *= sizeof(int); 170 error = copyout(oid, SCARG(uap, old), 171 MIN(oidlen, *SCARG(uap, oldlenp))); 172 if (error) 173 return(error); 174 ktrmibio(-1, UIO_READ, SCARG(uap, old), 175 MIN(oidlen, *SCARG(uap, oldlenp)), 0); 176 177 error = copyout(&oidlen, SCARG(uap, oldlenp), sizeof(u_int)); 178 179 return(error); 180 } 181 182 return(EOPNOTSUPP); 183 } 184 185 static int 186 freebsd_sysctl_name2oid(char *name, int *oid, int *oidlen) 187 { 188 char *dot; 189 int oi, ci; 190 struct sysctlnode *node, *pnode; 191 192 pnode = &sysctl_root; 193 node = sysctl_root.sysctl_child; 194 oi = 0; 195 if ((dot = strchr(name, (int)'.')) != NULL) 196 *dot++ = '\0'; 197 198 next: 199 while (*name != '\0' && node != NULL) { 200 for (ci = 0; ci < pnode->sysctl_clen; ci++) { 201 if (strcmp(name, node[ci].sysctl_name) == 0) { 202 oid[oi++] = node[ci].sysctl_num; 203 if ((name = dot) == NULL) { 204 *oidlen = oi; 205 return(0); 206 } 207 if ((dot = strchr(name, (int)'.')) != NULL) 208 *dot++ = '\0'; 209 210 if (SYSCTL_TYPE(node[ci].sysctl_flags) != 211 CTLTYPE_NODE) 212 return(ENOTDIR); 213 214 pnode = &node[ci]; 215 node = pnode->sysctl_child; 216 goto next; 217 } 218 } 219 220 /* no more nodes, it must not exist */ 221 break; 222 } 223 224 return(ENOENT); 225 } 226