1 /* $NetBSD: netbsd32_sysctl.c,v 1.45 2021/01/19 03:20:13 simonb 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. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include <sys/cdefs.h>
35 __KERNEL_RCSID(0, "$NetBSD: netbsd32_sysctl.c,v 1.45 2021/01/19 03:20:13 simonb Exp $");
36
37 #if defined(_KERNEL_OPT)
38 #include "opt_ddb.h"
39 #endif
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/kernel.h>
44 #include <sys/mount.h>
45 #include <sys/stat.h>
46 #include <sys/time.h>
47 #include <sys/vnode.h>
48 #include <sys/syscallargs.h>
49 #include <sys/proc.h>
50 #include <sys/sysctl.h>
51 #include <sys/dirent.h>
52 #include <sys/ktrace.h>
53
54 #include <uvm/uvm_extern.h>
55
56 #include <compat/netbsd32/netbsd32.h>
57 #include <compat/netbsd32/netbsd32_syscall.h>
58 #include <compat/netbsd32/netbsd32_syscallargs.h>
59 #include <compat/netbsd32/netbsd32_conv.h>
60 #include <compat/netbsd32/netbsd32_sysctl.h>
61
62 #if defined(DDB)
63 #include <ddb/ddbvar.h>
64 #endif
65
66 struct sysctlnode netbsd32_sysctl_root = {
67 .sysctl_flags = SYSCTL_VERSION|CTLFLAG_ROOT|CTLTYPE_NODE,
68 .sysctl_num = 0,
69 .sysctl_name = "(netbsd32_root)",
70 .sysctl_size = sizeof(struct sysctlnode),
71 };
72
73 /*
74 * sysctl helper routine for netbsd32's kern.boottime node
75 */
76 static int
netbsd32_sysctl_kern_boottime(SYSCTLFN_ARGS)77 netbsd32_sysctl_kern_boottime(SYSCTLFN_ARGS)
78 {
79 struct sysctlnode node;
80 struct netbsd32_timespec bt32;
81 struct timespec ts;
82
83 getnanoboottime(&ts);
84 netbsd32_from_timespec(&ts, &bt32);
85
86 node = *rnode;
87 node.sysctl_data = &bt32;
88 return sysctl_lookup(SYSCTLFN_CALL(&node));
89 }
90
91 /*
92 * sysctl helper routine for netbsd32's vm.loadavg node
93 */
94 static int
netbsd32_sysctl_vm_loadavg(SYSCTLFN_ARGS)95 netbsd32_sysctl_vm_loadavg(SYSCTLFN_ARGS)
96 {
97 struct sysctlnode node;
98 struct netbsd32_loadavg av32;
99
100 netbsd32_from_loadavg(&av32, &averunnable);
101
102 node = *rnode;
103 node.sysctl_data = &av32;
104 return sysctl_lookup(SYSCTLFN_CALL(&node));
105 }
106
107 static int
sysctl_hw_machine_arch32(SYSCTLFN_ARGS)108 sysctl_hw_machine_arch32(SYSCTLFN_ARGS)
109 {
110 struct sysctlnode node = *rnode;
111 #ifndef PROC_MACHINE_ARCH32
112 extern const char machine_arch32[];
113 #define PROC_MACHINE_ARCH32(P) __UNCONST(machine_arch32)
114 #endif
115
116 node.sysctl_data = PROC_MACHINE_ARCH32(l->l_proc);
117 node.sysctl_size = strlen(node.sysctl_data) + 1;
118 return sysctl_lookup(SYSCTLFN_CALL(&node));
119 }
120
121 SYSCTL_SETUP(netbsd32_sysctl_emul_setup, "netbsd32 shadow tree")
122 {
123 const struct sysctlnode *_root = &netbsd32_sysctl_root;
124 extern const char machine32[];
125
126 sysctl_createv(clog, 0, &_root, NULL,
127 CTLFLAG_PERMANENT,
128 CTLTYPE_NODE, "kern", NULL,
129 NULL, 0, NULL, 0,
130 CTL_KERN, CTL_EOL);
131 sysctl_createv(clog, 0, &_root, NULL,
132 CTLFLAG_PERMANENT,
133 CTLTYPE_STRUCT, "boottime", NULL,
134 netbsd32_sysctl_kern_boottime, 0, NULL,
135 sizeof(struct netbsd32_timeval),
136 CTL_KERN, KERN_BOOTTIME, CTL_EOL);
137
138 sysctl_createv(clog, 0, &_root, NULL,
139 CTLFLAG_PERMANENT,
140 CTLTYPE_NODE, "vm", NULL,
141 NULL, 0, NULL, 0,
142 CTL_VM, CTL_EOL);
143 sysctl_createv(clog, 0, &_root, NULL,
144 CTLFLAG_PERMANENT,
145 CTLTYPE_STRUCT, "loadavg", NULL,
146 netbsd32_sysctl_vm_loadavg, 0, NULL,
147 sizeof(struct netbsd32_loadavg),
148 CTL_VM, VM_LOADAVG, CTL_EOL);
149 sysctl_createv(clog, 0, &_root, NULL,
150 CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
151 CTLTYPE_INT, "maxaddress",
152 SYSCTL_DESCR("Maximum user address"),
153 NULL, VM_MAXUSER_ADDRESS32, NULL, 0,
154 CTL_VM, VM_MAXADDRESS, CTL_EOL);
155 sysctl_createv(clog, 0, &_root, NULL,
156 CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
157 CTLTYPE_INT, "minaddress",
158 SYSCTL_DESCR("Minimum user address"),
159 NULL, VM_MIN_ADDRESS, NULL, 0,
160 CTL_VM, VM_MINADDRESS, CTL_EOL);
161
162 sysctl_createv(clog, 0, &_root, NULL,
163 CTLFLAG_PERMANENT,
164 CTLTYPE_NODE, "hw", NULL,
165 NULL, 0, NULL, 0,
166 CTL_HW, CTL_EOL);
167 sysctl_createv(clog, 0, &_root, NULL,
168 CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
169 CTLTYPE_INT, "alignbytes", NULL,
170 NULL, ALIGNBYTES32, NULL, 0,
171 CTL_HW, HW_ALIGNBYTES, CTL_EOL);
172 sysctl_createv(clog, 0, &_root, NULL,
173 CTLFLAG_PERMANENT,
174 CTLTYPE_STRING, "machine", NULL,
175 NULL, 0, __UNCONST(&machine32), 0,
176 CTL_HW, HW_MACHINE, CTL_EOL);
177 sysctl_createv(clog, 0, &_root, NULL,
178 CTLFLAG_PERMANENT|CTLFLAG_READONLY,
179 CTLTYPE_STRING, "machine_arch", NULL,
180 sysctl_hw_machine_arch32, 0, NULL, 0,
181 CTL_HW, HW_MACHINE_ARCH, CTL_EOL);
182 }
183
184 void
netbsd32_sysctl_fini(void)185 netbsd32_sysctl_fini(void)
186 {
187
188 sysctl_free(&netbsd32_sysctl_root);
189 }
190
191 int
netbsd32___sysctl(struct lwp * l,const struct netbsd32___sysctl_args * uap,register_t * retval)192 netbsd32___sysctl(struct lwp *l, const struct netbsd32___sysctl_args *uap, register_t *retval)
193 {
194 /* {
195 syscallarg(netbsd32_intp) name;
196 syscallarg(u_int) namelen;
197 syscallarg(netbsd32_voidp) old;
198 syscallarg(netbsd32_size_tp) oldlenp;
199 syscallarg(netbsd32_voidp) new;
200 syscallarg(netbsd32_size_t) newlen;
201 } */
202 const struct sysctlnode *pnode;
203 netbsd32_size_t netbsd32_oldlen;
204 size_t oldlen, *oldlenp, savelen;
205 int name[CTL_MAXNAME], error, nerror, *namep;
206 void *newp, *oldp;
207
208 /*
209 * get and convert 32 bit size_t to native size_t
210 */
211 namep = SCARG_P32(uap, name);
212 oldp = SCARG_P32(uap, oldv);
213 newp = SCARG_P32(uap, newv);
214 oldlenp = SCARG_P32(uap, oldlenp);
215 oldlen = 0;
216 if (oldlenp != NULL) {
217 error = copyin(oldlenp, &netbsd32_oldlen,
218 sizeof(netbsd32_oldlen));
219 if (error)
220 return error;
221 oldlen = netbsd32_oldlen;
222 }
223 savelen = oldlen;
224
225 /*
226 * retrieve name and see if we need to dispatch this query to
227 * the shadow tree. if we find it in the shadow tree,
228 * dispatch to there, otherwise NULL means use the built-in
229 * default main tree.
230 */
231 if (SCARG(uap, namelen) > CTL_MAXNAME || SCARG(uap, namelen) < 1)
232 return EINVAL;
233 error = copyin(namep, &name[0], SCARG(uap, namelen) * sizeof(int));
234 if (error)
235 return error;
236
237 ktrmib(name, SCARG(uap, namelen));
238
239 sysctl_lock(newp != NULL);
240 pnode = &netbsd32_sysctl_root;
241 error = sysctl_locate(l, &name[0], SCARG(uap, namelen), &pnode, NULL);
242 pnode = (error == 0) ? &netbsd32_sysctl_root : NULL;
243 error = sysctl_dispatch(&name[0], SCARG(uap, namelen),
244 oldp, &oldlen,
245 newp, SCARG(uap, newlen),
246 &name[0], l, pnode);
247 sysctl_unlock();
248
249 /*
250 * reset caller's oldlen, even if we got an error
251 */
252 if (oldlenp) {
253 netbsd32_oldlen = oldlen;
254 nerror = copyout(&netbsd32_oldlen, oldlenp,
255 sizeof(netbsd32_oldlen));
256 if (error == 0)
257 error = nerror;
258 }
259
260 /*
261 * if the only problem is that we weren't given enough space,
262 * that's an ENOMEM error
263 */
264 if (error == 0 && oldp != NULL && savelen < oldlen)
265 error = ENOMEM;
266
267 return error;
268 }
269