1/* $NetBSD: sysv_ipc_50.c,v 1.4 2015/12/03 00:28:55 pgoyette Exp $ */
2
3/*-
4 * Copyright (c) 1998, 2007 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Charles M. Hannum.
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 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: sysv_ipc_50.c,v 1.4 2015/12/03 00:28:55 pgoyette Exp $");
34
35#ifdef _KERNEL_OPT
36#include "opt_sysv.h"
37#include "opt_compat_netbsd.h"
38#endif
39
40#include <sys/param.h>
41#include <sys/kernel.h>
42#include <sys/proc.h>
43#include <sys/ipc.h>
44#ifdef SYSVMSG
45#include <sys/msg.h>
46#endif
47#ifdef SYSVSEM
48#include <sys/sem.h>
49#endif
50#ifdef SYSVSHM
51#include <sys/shm.h>
52#endif
53#include <sys/systm.h>
54#include <sys/malloc.h>
55#include <sys/mount.h>
56#include <sys/vnode.h>
57#include <sys/stat.h>
58#include <sys/sysctl.h>
59#include <sys/kauth.h>
60
61#ifdef COMPAT_50
62#include <compat/sys/ipc.h>
63#ifdef SYSVMSG
64#include <compat/sys/msg.h>
65#endif
66#ifdef SYSVSEM
67#include <compat/sys/sem.h>
68#endif
69#ifdef SYSVSHM
70#include <compat/sys/shm.h>
71#endif
72
73/*
74 * Check for ipc permission
75 */
76
77int sysctl_kern_sysvipc50(SYSCTLFN_PROTO);
78
79int
80sysctl_kern_sysvipc50(SYSCTLFN_ARGS)
81{
82 void *where = oldp;
83 size_t *sizep = oldlenp;
84#ifdef SYSVMSG
85 struct msg_sysctl_info50 *msgsi = NULL;
86#endif
87#ifdef SYSVSEM
88 struct sem_sysctl_info50 *semsi = NULL;
89#endif
90#ifdef SYSVSHM
91 struct shm_sysctl_info50 *shmsi = NULL;
92#endif
93 size_t infosize, dssize, tsize, buflen;
94 void *bf = NULL;
95 char *start;
96 int32_t nds;
97 int i, error, ret;
98
99 if (namelen != 1)
100 return EINVAL;
101
102 start = where;
103 buflen = *sizep;
104
105 switch (*name) {
106 case KERN_SYSVIPC_OMSG_INFO:
107#ifdef SYSVMSG
108 infosize = sizeof(msgsi->msginfo);
109 nds = msginfo.msgmni;
110 dssize = sizeof(msgsi->msgids[0]);
111 break;
112#else
113 return EINVAL;
114#endif
115 case KERN_SYSVIPC_OSEM_INFO:
116#ifdef SYSVSEM
117 infosize = sizeof(semsi->seminfo);
118 nds = seminfo.semmni;
119 dssize = sizeof(semsi->semids[0]);
120 break;
121#else
122 return EINVAL;
123#endif
124 case KERN_SYSVIPC_OSHM_INFO:
125#ifdef SYSVSHM
126 infosize = sizeof(shmsi->shminfo);
127 nds = shminfo.shmmni;
128 dssize = sizeof(shmsi->shmids[0]);
129 break;
130#else
131 return EINVAL;
132#endif
133 default:
134 return EPASSTHROUGH;
135 }
136 /*
137 * Round infosize to 64 bit boundary if requesting more than just
138 * the info structure or getting the total data size.
139 */
140 if (where == NULL || *sizep > infosize)
141 infosize = roundup(infosize, sizeof(quad_t));
142 tsize = infosize + nds * dssize;
143
144 /* Return just the total size required. */
145 if (where == NULL) {
146 *sizep = tsize;
147 return 0;
148 }
149
150 /* Not enough room for even the info struct. */
151 if (buflen < infosize) {
152 *sizep = 0;
153 return ENOMEM;
154 }
155 bf = malloc(min(tsize, buflen), M_TEMP, M_WAITOK | M_ZERO);
156
157 switch (*name) {
158#ifdef SYSVMSG
159 case KERN_SYSVIPC_OMSG_INFO:
160 msgsi = (struct msg_sysctl_info50 *)bf;
161 msgsi->msginfo = msginfo;
162 break;
163#endif
164#ifdef SYSVSEM
165 case KERN_SYSVIPC_OSEM_INFO:
166 semsi = (struct sem_sysctl_info50 *)bf;
167 semsi->seminfo = seminfo;
168 break;
169#endif
170#ifdef SYSVSHM
171 case KERN_SYSVIPC_OSHM_INFO:
172 shmsi = (struct shm_sysctl_info50 *)bf;
173 shmsi->shminfo = shminfo;
174 break;
175#endif
176 }
177 buflen -= infosize;
178
179 ret = 0;
180 if (buflen > 0) {
181 /* Fill in the IPC data structures. */
182 for (i = 0; i < nds; i++) {
183 if (buflen < dssize) {
184 ret = ENOMEM;
185 break;
186 }
187 switch (*name) {
188#ifdef SYSVMSG
189 case KERN_SYSVIPC_OMSG_INFO:
190 mutex_enter(&msgmutex);
191 SYSCTL_FILL_MSG(msqs[i].msq_u, msgsi->msgids[i]);
192 mutex_exit(&msgmutex);
193 break;
194#endif
195#ifdef SYSVSEM
196 case KERN_SYSVIPC_OSEM_INFO:
197 SYSCTL_FILL_SEM(sema[i], semsi->semids[i]);
198 break;
199#endif
200#ifdef SYSVSHM
201 case KERN_SYSVIPC_OSHM_INFO:
202 SYSCTL_FILL_SHM(shmsegs[i], shmsi->shmids[i]);
203 break;
204#endif
205 }
206 buflen -= dssize;
207 }
208 }
209 *sizep -= buflen;
210 error = copyout(bf, start, *sizep);
211 /* If copyout succeeded, use return code set earlier. */
212 if (error == 0)
213 error = ret;
214 if (bf)
215 free(bf, M_TEMP);
216 return error;
217}
218#endif /* COMPAT_50 */
219