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
freebsd_sysctl_init(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
freebsd_sysctl_fini(void)74 freebsd_sysctl_fini(void)
75 {
76
77 sysctl_teardown(&freebsd_clog);
78 }
79
80 int
freebsd_sys_sysctl(struct lwp * l,const struct freebsd_sys_sysctl_args * uap,register_t * retval)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
freebsd_sysctl_name2oid(char * name,int * oid,int * oidlen)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