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      1 /*	$NetBSD: freebsd_sysctl.c,v 1.19 2015/02/14 07:37:19 dholland 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 1.19 2015/02/14 07:37:19 dholland 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|CTLFLAG_IMMEDIATE,
     67 			CTLTYPE_INT, "osreldate",
     68 			SYSCTL_DESCR("Operating system revision"),
     69 			NULL, __NetBSD_Version__, NULL, 0,
     70 			CTL_KERN, CTL_CREATE, CTL_EOL);
     71 }
     72 
     73 void
     74 freebsd_sysctl_fini(void)
     75 {
     76 
     77 	sysctl_teardown(&freebsd_clog);
     78 }
     79 
     80 int
     81 freebsd_sys_sysctl(struct lwp *l, const struct freebsd_sys_sysctl_args *uap, register_t *retval)
     82 {
     83 	/* {
     84 		syscallarg(int *) name;
     85 		syscallarg(u_int) namelen;
     86 		syscallarg(void *) old;
     87 		syscallarg(size_t *) oldlenp;
     88 		syscallarg(void *) new;
     89 		syscallarg(size_t) newlen;
     90 	} */
     91 	int error;
     92 	int name[CTL_MAXNAME];
     93 	size_t newlen, *oldlenp, oldlen;
     94 	u_int namelen;
     95 	void *new, *old;
     96 
     97 	namelen = SCARG(uap, namelen);
     98 
     99 	if ((namelen > CTL_MAXNAME) || (namelen < 1))
    100 		return EINVAL;
    101 
    102 	if ((error = copyin(SCARG(uap, name), name,
    103 	    namelen * sizeof(*name))) != 0)
    104 		return error;
    105 
    106 	if (namelen > 0 && name[0] != 0)
    107 		return(sys___sysctl(l, (const void *)uap, retval));
    108 
    109 	ktrmib(name, namelen);
    110 
    111 	/*
    112 	 * FreeBSD sysctl uses an undocumented set of special OIDs in its
    113 	 * sysctl MIB whose tree is rooted at oid 0.  These OIDs are
    114 	 * interpreted by their sysctl to implement functions that NetBSD
    115 	 * performs in libc, such as sysctlgetmibinfo.
    116 	 *
    117 	 * From the FreeBSD kern_sysctl.c, these OIDs are:
    118 	 * {0,0}        printf the entire MIB-tree.
    119 	 * {0,1,...}    return the name of the "..." OID.
    120 	 * {0,2,...}    return the next OID.
    121 	 * {0,3}        return the OID of the name in "new"
    122 	 * {0,4,...}    return the kind & format info for the "..." OID.
    123 	 * {0,5,...}    return the description the "..." OID.
    124 	 *
    125 	 * Only implement {0,3} for now.
    126 	 */
    127 
    128 	if (namelen < 2 || namelen > CTL_MAXNAME)
    129 		return(EINVAL);
    130 
    131 	if (name[1] == 3) {
    132 		char *locnew;
    133 		int oid[CTL_MAXNAME];
    134 		u_int oidlen = CTL_MAXNAME;
    135 
    136 		new = SCARG(uap, new);
    137 		newlen = SCARG(uap, newlen);
    138 		if (new == NULL || newlen < 1 ||
    139 		    newlen > (SYSCTL_NAMELEN * CTL_MAXNAME))
    140 			return(EINVAL);
    141 
    142 		old = SCARG(uap, old);
    143 		oldlenp = SCARG(uap, oldlenp);
    144 		if (old == NULL || oldlenp == NULL)
    145 			return(EINVAL);
    146 
    147 		if ((error = copyin(oldlenp, &oldlen, sizeof(oldlen))))
    148 			return (error);
    149 		if (oldlen < 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, oldlen));
    172 		if (error)
    173 			return(error);
    174 		ktrmibio(-1, UIO_READ, SCARG(uap, old),
    175 		    MIN(oidlen, oldlen),  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