xref: /freebsd/sys/compat/linux/linux_ipc.c (revision 7661de35d15f582ab33e3bd6b8d909601557e436)
1 /*-
2  * Copyright (c) 1994-1995 Søren Schmidt
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer
10  *    in this position and unchanged.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  * 3. The name of the author may not be used to endorse or promote products
15  *    derived from this software without specific prior written permission
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  */
28 
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31 
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/syscallsubr.h>
35 #include <sys/sysproto.h>
36 #include <sys/proc.h>
37 #include <sys/limits.h>
38 #include <sys/msg.h>
39 #include <sys/sem.h>
40 #include <sys/shm.h>
41 
42 #include "opt_compat.h"
43 
44 #ifdef COMPAT_LINUX32
45 #include <machine/../linux32/linux.h>
46 #include <machine/../linux32/linux32_proto.h>
47 #include <machine/../linux32/linux32_ipc64.h>
48 #else
49 #include <machine/../linux/linux.h>
50 #include <machine/../linux/linux_proto.h>
51 #include <machine/../linux/linux_ipc64.h>
52 #endif
53 #include <compat/linux/linux_ipc.h>
54 #include <compat/linux/linux_util.h>
55 
56 struct l_seminfo {
57 	l_int semmap;
58 	l_int semmni;
59 	l_int semmns;
60 	l_int semmnu;
61 	l_int semmsl;
62 	l_int semopm;
63 	l_int semume;
64 	l_int semusz;
65 	l_int semvmx;
66 	l_int semaem;
67 };
68 
69 struct l_shminfo {
70 	l_int shmmax;
71 	l_int shmmin;
72 	l_int shmmni;
73 	l_int shmseg;
74 	l_int shmall;
75 };
76 
77 struct l_shm_info {
78 	l_int used_ids;
79 	l_ulong shm_tot;  /* total allocated shm */
80 	l_ulong shm_rss;  /* total resident shm */
81 	l_ulong shm_swp;  /* total swapped shm */
82 	l_ulong swap_attempts;
83 	l_ulong swap_successes;
84 };
85 
86 struct l_msginfo {
87 	l_int msgpool;
88 	l_int msgmap;
89 	l_int msgmax;
90 	l_int msgmnb;
91 	l_int msgmni;
92 	l_int msgssz;
93 	l_int msgtql;
94 	l_ushort msgseg;
95 };
96 
97 static void
98 bsd_to_linux_shminfo( struct shminfo *bpp, struct l_shminfo *lpp)
99 {
100 
101 	lpp->shmmax = bpp->shmmax;
102 	lpp->shmmin = bpp->shmmin;
103 	lpp->shmmni = bpp->shmmni;
104 	lpp->shmseg = bpp->shmseg;
105 	lpp->shmall = bpp->shmall;
106 }
107 
108 static void
109 bsd_to_linux_shm_info( struct shm_info *bpp, struct l_shm_info *lpp)
110 {
111 
112 	lpp->used_ids = bpp->used_ids ;
113 	lpp->shm_tot = bpp->shm_tot ;
114 	lpp->shm_rss = bpp->shm_rss ;
115 	lpp->shm_swp = bpp->shm_swp ;
116 	lpp->swap_attempts = bpp->swap_attempts ;
117 	lpp->swap_successes = bpp->swap_successes ;
118 }
119 
120 struct l_ipc_perm {
121 	l_key_t		key;
122 	l_uid16_t	uid;
123 	l_gid16_t	gid;
124 	l_uid16_t	cuid;
125 	l_gid16_t	cgid;
126 	l_ushort	mode;
127 	l_ushort	seq;
128 };
129 
130 static void
131 linux_to_bsd_ipc_perm(struct l_ipc_perm *lpp, struct ipc_perm *bpp)
132 {
133 
134 	bpp->key = lpp->key;
135 	bpp->uid = lpp->uid;
136 	bpp->gid = lpp->gid;
137 	bpp->cuid = lpp->cuid;
138 	bpp->cgid = lpp->cgid;
139 	bpp->mode = lpp->mode;
140 	bpp->seq = lpp->seq;
141 }
142 
143 
144 static void
145 bsd_to_linux_ipc_perm(struct ipc_perm *bpp, struct l_ipc_perm *lpp)
146 {
147 
148 	lpp->key = bpp->key;
149 	lpp->uid = bpp->uid;
150 	lpp->gid = bpp->gid;
151 	lpp->cuid = bpp->cuid;
152 	lpp->cgid = bpp->cgid;
153 	lpp->mode = bpp->mode;
154 	lpp->seq = bpp->seq;
155 }
156 
157 struct l_msqid_ds {
158 	struct l_ipc_perm	msg_perm;
159 	l_uintptr_t		msg_first;	/* first message on queue,unused */
160 	l_uintptr_t		msg_last;	/* last message in queue,unused */
161 	l_time_t		msg_stime;	/* last msgsnd time */
162 	l_time_t		msg_rtime;	/* last msgrcv time */
163 	l_time_t		msg_ctime;	/* last change time */
164 	l_ulong			msg_lcbytes;	/* Reuse junk fields for 32 bit */
165 	l_ulong			msg_lqbytes;	/* ditto */
166 	l_ushort		msg_cbytes;	/* current number of bytes on queue */
167 	l_ushort		msg_qnum;	/* number of messages in queue */
168 	l_ushort		msg_qbytes;	/* max number of bytes on queue */
169 	l_pid_t			msg_lspid;	/* pid of last msgsnd */
170 	l_pid_t			msg_lrpid;	/* last receive pid */
171 }
172 #if defined(__amd64__) && defined(COMPAT_LINUX32)
173 __packed
174 #endif
175 ;
176 
177 struct l_semid_ds {
178 	struct l_ipc_perm	sem_perm;
179 	l_time_t		sem_otime;
180 	l_time_t		sem_ctime;
181 	l_uintptr_t		sem_base;
182 	l_uintptr_t		sem_pending;
183 	l_uintptr_t		sem_pending_last;
184 	l_uintptr_t		undo;
185 	l_ushort		sem_nsems;
186 }
187 #if defined(__amd64__) && defined(COMPAT_LINUX32)
188 __packed
189 #endif
190 ;
191 
192 struct l_shmid_ds {
193 	struct l_ipc_perm	shm_perm;
194 	l_int			shm_segsz;
195 	l_time_t		shm_atime;
196 	l_time_t		shm_dtime;
197 	l_time_t		shm_ctime;
198 	l_ushort		shm_cpid;
199 	l_ushort		shm_lpid;
200 	l_short			shm_nattch;
201 	l_ushort		private1;
202 	l_uintptr_t		private2;
203 	l_uintptr_t		private3;
204 };
205 
206 static void
207 linux_to_bsd_semid_ds(struct l_semid_ds *lsp, struct semid_ds *bsp)
208 {
209 
210 	linux_to_bsd_ipc_perm(&lsp->sem_perm, &bsp->sem_perm);
211 	bsp->sem_otime = lsp->sem_otime;
212 	bsp->sem_ctime = lsp->sem_ctime;
213 	bsp->sem_nsems = lsp->sem_nsems;
214 	bsp->sem_base = PTRIN(lsp->sem_base);
215 }
216 
217 static void
218 bsd_to_linux_semid_ds(struct semid_ds *bsp, struct l_semid_ds *lsp)
219 {
220 
221 	bsd_to_linux_ipc_perm(&bsp->sem_perm, &lsp->sem_perm);
222 	lsp->sem_otime = bsp->sem_otime;
223 	lsp->sem_ctime = bsp->sem_ctime;
224 	lsp->sem_nsems = bsp->sem_nsems;
225 	lsp->sem_base = PTROUT(bsp->sem_base);
226 }
227 
228 static void
229 linux_to_bsd_shmid_ds(struct l_shmid_ds *lsp, struct shmid_ds *bsp)
230 {
231 
232 	linux_to_bsd_ipc_perm(&lsp->shm_perm, &bsp->shm_perm);
233 	bsp->shm_segsz = lsp->shm_segsz;
234 	bsp->shm_lpid = lsp->shm_lpid;
235 	bsp->shm_cpid = lsp->shm_cpid;
236 	bsp->shm_nattch = lsp->shm_nattch;
237 	bsp->shm_atime = lsp->shm_atime;
238 	bsp->shm_dtime = lsp->shm_dtime;
239 	bsp->shm_ctime = lsp->shm_ctime;
240 }
241 
242 static void
243 bsd_to_linux_shmid_ds(struct shmid_ds *bsp, struct l_shmid_ds *lsp)
244 {
245 
246 	bsd_to_linux_ipc_perm(&bsp->shm_perm, &lsp->shm_perm);
247 	if (bsp->shm_segsz > INT_MAX)
248 		lsp->shm_segsz = INT_MAX;
249 	else
250 		lsp->shm_segsz = bsp->shm_segsz;
251 	lsp->shm_lpid = bsp->shm_lpid;
252 	lsp->shm_cpid = bsp->shm_cpid;
253 	if (bsp->shm_nattch > SHRT_MAX)
254 		lsp->shm_nattch = SHRT_MAX;
255 	else
256 		lsp->shm_nattch = bsp->shm_nattch;
257 	lsp->shm_atime = bsp->shm_atime;
258 	lsp->shm_dtime = bsp->shm_dtime;
259 	lsp->shm_ctime = bsp->shm_ctime;
260 	lsp->private3 = 0;
261 }
262 
263 static void
264 linux_to_bsd_msqid_ds(struct l_msqid_ds *lsp, struct msqid_ds *bsp)
265 {
266 
267 	linux_to_bsd_ipc_perm(&lsp->msg_perm, &bsp->msg_perm);
268 	bsp->msg_cbytes = lsp->msg_cbytes;
269 	bsp->msg_qnum = lsp->msg_qnum;
270 	bsp->msg_qbytes = lsp->msg_qbytes;
271 	bsp->msg_lspid = lsp->msg_lspid;
272 	bsp->msg_lrpid = lsp->msg_lrpid;
273 	bsp->msg_stime = lsp->msg_stime;
274 	bsp->msg_rtime = lsp->msg_rtime;
275 	bsp->msg_ctime = lsp->msg_ctime;
276 }
277 
278 static void
279 bsd_to_linux_msqid_ds(struct msqid_ds *bsp, struct l_msqid_ds *lsp)
280 {
281 
282 	bsd_to_linux_ipc_perm(&bsp->msg_perm, &lsp->msg_perm);
283 	lsp->msg_cbytes = bsp->msg_cbytes;
284 	lsp->msg_qnum = bsp->msg_qnum;
285 	lsp->msg_qbytes = bsp->msg_qbytes;
286 	lsp->msg_lspid = bsp->msg_lspid;
287 	lsp->msg_lrpid = bsp->msg_lrpid;
288 	lsp->msg_stime = bsp->msg_stime;
289 	lsp->msg_rtime = bsp->msg_rtime;
290 	lsp->msg_ctime = bsp->msg_ctime;
291 }
292 
293 static void
294 linux_ipc_perm_to_ipc64_perm(struct l_ipc_perm *in, struct l_ipc64_perm *out)
295 {
296 
297 	/* XXX: do we really need to do something here? */
298 	out->key = in->key;
299 	out->uid = in->uid;
300 	out->gid = in->gid;
301 	out->cuid = in->cuid;
302 	out->cgid = in->cgid;
303 	out->mode = in->mode;
304 	out->seq = in->seq;
305 }
306 
307 static int
308 linux_msqid_pullup(l_int ver, struct l_msqid_ds *linux_msqid, caddr_t uaddr)
309 {
310 	struct l_msqid64_ds linux_msqid64;
311 	int error;
312 
313 	if (ver == LINUX_IPC_64) {
314 		error = copyin(uaddr, &linux_msqid64, sizeof(linux_msqid64));
315 		if (error != 0)
316 			return (error);
317 
318 		bzero(linux_msqid, sizeof(*linux_msqid));
319 
320 		linux_msqid->msg_perm.uid = linux_msqid64.msg_perm.uid;
321 		linux_msqid->msg_perm.gid = linux_msqid64.msg_perm.gid;
322 		linux_msqid->msg_perm.mode = linux_msqid64.msg_perm.mode;
323 
324 		if (linux_msqid64.msg_qbytes > USHRT_MAX)
325 			linux_msqid->msg_lqbytes = linux_msqid64.msg_qbytes;
326 		else
327 			linux_msqid->msg_qbytes = linux_msqid64.msg_qbytes;
328 	} else
329 		error = copyin(uaddr, linux_msqid, sizeof(*linux_msqid));
330 
331 	return (error);
332 }
333 
334 static int
335 linux_msqid_pushdown(l_int ver, struct l_msqid_ds *linux_msqid, caddr_t uaddr)
336 {
337 	struct l_msqid64_ds linux_msqid64;
338 
339 	if (ver == LINUX_IPC_64) {
340 		bzero(&linux_msqid64, sizeof(linux_msqid64));
341 
342 		linux_ipc_perm_to_ipc64_perm(&linux_msqid->msg_perm,
343 		    &linux_msqid64.msg_perm);
344 
345 		linux_msqid64.msg_stime = linux_msqid->msg_stime;
346 		linux_msqid64.msg_rtime = linux_msqid->msg_rtime;
347 		linux_msqid64.msg_ctime = linux_msqid->msg_ctime;
348 
349 		if (linux_msqid->msg_cbytes == 0)
350 			linux_msqid64.msg_cbytes = linux_msqid->msg_lcbytes;
351 		else
352 			linux_msqid64.msg_cbytes = linux_msqid->msg_cbytes;
353 
354 		linux_msqid64.msg_qnum = linux_msqid->msg_qnum;
355 
356 		if (linux_msqid->msg_qbytes == 0)
357 			linux_msqid64.msg_qbytes = linux_msqid->msg_lqbytes;
358 		else
359 			linux_msqid64.msg_qbytes = linux_msqid->msg_qbytes;
360 
361 		linux_msqid64.msg_lspid = linux_msqid->msg_lspid;
362 		linux_msqid64.msg_lrpid = linux_msqid->msg_lrpid;
363 
364 		return (copyout(&linux_msqid64, uaddr, sizeof(linux_msqid64)));
365 	} else
366 		return (copyout(linux_msqid, uaddr, sizeof(*linux_msqid)));
367 }
368 
369 static int
370 linux_semid_pullup(l_int ver, struct l_semid_ds *linux_semid, caddr_t uaddr)
371 {
372 	struct l_semid64_ds linux_semid64;
373 	int error;
374 
375 	if (ver == LINUX_IPC_64) {
376 		error = copyin(uaddr, &linux_semid64, sizeof(linux_semid64));
377 		if (error != 0)
378 			return (error);
379 
380 		bzero(linux_semid, sizeof(*linux_semid));
381 
382 		linux_semid->sem_perm.uid = linux_semid64.sem_perm.uid;
383 		linux_semid->sem_perm.gid = linux_semid64.sem_perm.gid;
384 		linux_semid->sem_perm.mode = linux_semid64.sem_perm.mode;
385 	} else
386 		error = copyin(uaddr, linux_semid, sizeof(*linux_semid));
387 
388 	return (error);
389 }
390 
391 static int
392 linux_semid_pushdown(l_int ver, struct l_semid_ds *linux_semid, caddr_t uaddr)
393 {
394 	struct l_semid64_ds linux_semid64;
395 
396 	if (ver == LINUX_IPC_64) {
397 		bzero(&linux_semid64, sizeof(linux_semid64));
398 
399 		linux_ipc_perm_to_ipc64_perm(&linux_semid->sem_perm,
400 		    &linux_semid64.sem_perm);
401 
402 		linux_semid64.sem_otime = linux_semid->sem_otime;
403 		linux_semid64.sem_ctime = linux_semid->sem_ctime;
404 		linux_semid64.sem_nsems = linux_semid->sem_nsems;
405 
406 		return (copyout(&linux_semid64, uaddr, sizeof(linux_semid64)));
407 	} else
408 		return (copyout(linux_semid, uaddr, sizeof(*linux_semid)));
409 }
410 
411 static int
412 linux_shmid_pullup(l_int ver, struct l_shmid_ds *linux_shmid, caddr_t uaddr)
413 {
414 	struct l_shmid64_ds linux_shmid64;
415 	int error;
416 
417 	if (ver == LINUX_IPC_64) {
418 		error = copyin(uaddr, &linux_shmid64, sizeof(linux_shmid64));
419 		if (error != 0)
420 			return (error);
421 
422 		bzero(linux_shmid, sizeof(*linux_shmid));
423 
424 		linux_shmid->shm_perm.uid = linux_shmid64.shm_perm.uid;
425 		linux_shmid->shm_perm.gid = linux_shmid64.shm_perm.gid;
426 		linux_shmid->shm_perm.mode = linux_shmid64.shm_perm.mode;
427 	} else
428 		error = copyin(uaddr, linux_shmid, sizeof(*linux_shmid));
429 
430 	return (error);
431 }
432 
433 static int
434 linux_shmid_pushdown(l_int ver, struct l_shmid_ds *linux_shmid, caddr_t uaddr)
435 {
436 	struct l_shmid64_ds linux_shmid64;
437 
438 	/*
439 	 * XXX: This is backwards and loses information in shm_nattch
440 	 * and shm_segsz.  We should probably either expose the BSD
441 	 * shmid structure directly and convert it to either the
442 	 * non-64 or 64 variant directly or the code should always
443 	 * convert to the 64 variant and then truncate values into the
444 	 * non-64 variant if needed since the 64 variant has more
445 	 * precision.
446 	 */
447 	if (ver == LINUX_IPC_64) {
448 		bzero(&linux_shmid64, sizeof(linux_shmid64));
449 
450 		linux_ipc_perm_to_ipc64_perm(&linux_shmid->shm_perm,
451 		    &linux_shmid64.shm_perm);
452 
453 		linux_shmid64.shm_segsz = linux_shmid->shm_segsz;
454 		linux_shmid64.shm_atime = linux_shmid->shm_atime;
455 		linux_shmid64.shm_dtime = linux_shmid->shm_dtime;
456 		linux_shmid64.shm_ctime = linux_shmid->shm_ctime;
457 		linux_shmid64.shm_cpid = linux_shmid->shm_cpid;
458 		linux_shmid64.shm_lpid = linux_shmid->shm_lpid;
459 		linux_shmid64.shm_nattch = linux_shmid->shm_nattch;
460 
461 		return (copyout(&linux_shmid64, uaddr, sizeof(linux_shmid64)));
462 	} else
463 		return (copyout(linux_shmid, uaddr, sizeof(*linux_shmid)));
464 }
465 
466 static int
467 linux_shminfo_pushdown(l_int ver, struct l_shminfo *linux_shminfo,
468     caddr_t uaddr)
469 {
470 	struct l_shminfo64 linux_shminfo64;
471 
472 	if (ver == LINUX_IPC_64) {
473 		bzero(&linux_shminfo64, sizeof(linux_shminfo64));
474 
475 		linux_shminfo64.shmmax = linux_shminfo->shmmax;
476 		linux_shminfo64.shmmin = linux_shminfo->shmmin;
477 		linux_shminfo64.shmmni = linux_shminfo->shmmni;
478 		linux_shminfo64.shmseg = linux_shminfo->shmseg;
479 		linux_shminfo64.shmall = linux_shminfo->shmall;
480 
481 		return (copyout(&linux_shminfo64, uaddr,
482 		    sizeof(linux_shminfo64)));
483 	} else
484 		return (copyout(linux_shminfo, uaddr, sizeof(*linux_shminfo)));
485 }
486 
487 int
488 linux_semop(struct thread *td, struct linux_semop_args *args)
489 {
490 	struct semop_args /* {
491 	int	semid;
492 	struct	sembuf *sops;
493 	int		nsops;
494 	} */ bsd_args;
495 
496 	bsd_args.semid = args->semid;
497 	bsd_args.sops = PTRIN(args->tsops);
498 	bsd_args.nsops = args->nsops;
499 	return (sys_semop(td, &bsd_args));
500 }
501 
502 int
503 linux_semget(struct thread *td, struct linux_semget_args *args)
504 {
505 	struct semget_args /* {
506 	key_t	key;
507 	int		nsems;
508 	int		semflg;
509 	} */ bsd_args;
510 
511 	if (args->nsems < 0)
512 		return (EINVAL);
513 	bsd_args.key = args->key;
514 	bsd_args.nsems = args->nsems;
515 	bsd_args.semflg = args->semflg;
516 	return (sys_semget(td, &bsd_args));
517 }
518 
519 int
520 linux_semctl(struct thread *td, struct linux_semctl_args *args)
521 {
522 	struct l_semid_ds linux_semid;
523 	struct l_seminfo linux_seminfo;
524 	struct semid_ds semid;
525 	union semun semun;
526 	register_t rval;
527 	int cmd, error;
528 
529 	switch (args->cmd & ~LINUX_IPC_64) {
530 	case LINUX_IPC_RMID:
531 		cmd = IPC_RMID;
532 		break;
533 	case LINUX_GETNCNT:
534 		cmd = GETNCNT;
535 		break;
536 	case LINUX_GETPID:
537 		cmd = GETPID;
538 		break;
539 	case LINUX_GETVAL:
540 		cmd = GETVAL;
541 		break;
542 	case LINUX_GETZCNT:
543 		cmd = GETZCNT;
544 		break;
545 	case LINUX_SETVAL:
546 		cmd = SETVAL;
547 		semun.val = args->arg.val;
548 		break;
549 	case LINUX_IPC_SET:
550 		cmd = IPC_SET;
551 		error = linux_semid_pullup(args->cmd & LINUX_IPC_64,
552 		    &linux_semid, PTRIN(args->arg.buf));
553 		if (error)
554 			return (error);
555 		linux_to_bsd_semid_ds(&linux_semid, &semid);
556 		semun.buf = &semid;
557 		return (kern_semctl(td, args->semid, args->semnum, cmd, &semun,
558 		    td->td_retval));
559 	case LINUX_IPC_STAT:
560 	case LINUX_SEM_STAT:
561 		if ((args->cmd & ~LINUX_IPC_64) == LINUX_IPC_STAT)
562 			cmd = IPC_STAT;
563 		else
564 			cmd = SEM_STAT;
565 		semun.buf = &semid;
566 		error = kern_semctl(td, args->semid, args->semnum, cmd, &semun,
567 		    &rval);
568 		if (error)
569 			return (error);
570 		bsd_to_linux_semid_ds(&semid, &linux_semid);
571 		error = linux_semid_pushdown(args->cmd & LINUX_IPC_64,
572 		    &linux_semid, PTRIN(args->arg.buf));
573 		if (error == 0)
574 			td->td_retval[0] = (cmd == SEM_STAT) ? rval : 0;
575 		return (error);
576 	case LINUX_IPC_INFO:
577 	case LINUX_SEM_INFO:
578 		bcopy(&seminfo, &linux_seminfo.semmni, sizeof(linux_seminfo) -
579 		    sizeof(linux_seminfo.semmap) );
580 		/*
581 		 * Linux does not use the semmap field but populates it with
582 		 * the defined value from SEMMAP, which really is redefined to
583 		 * SEMMNS, which they define as SEMMNI * SEMMSL.  Try to
584 		 * simulate this returning our dynamic semmns value.
585 		 */
586 		linux_seminfo.semmap = linux_seminfo.semmns;
587 /* XXX BSD equivalent?
588 #define used_semids 10
589 #define used_sems 10
590 		linux_seminfo.semusz = used_semids;
591 		linux_seminfo.semaem = used_sems;
592 */
593 		error = copyout(&linux_seminfo,
594 		    PTRIN(args->arg.buf), sizeof(linux_seminfo));
595 		if (error)
596 			return (error);
597 		td->td_retval[0] = seminfo.semmni;
598 		return (0);			/* No need for __semctl call */
599 	case LINUX_GETALL:
600 		cmd = GETALL;
601 		semun.val = args->arg.val;
602 		break;
603 	case LINUX_SETALL:
604 		cmd = SETALL;
605 		semun.val = args->arg.val;
606 		break;
607 	default:
608 		linux_msg(td, "ipc type %d is not implemented",
609 		  args->cmd & ~LINUX_IPC_64);
610 		return (EINVAL);
611 	}
612 	return (kern_semctl(td, args->semid, args->semnum, cmd, &semun,
613 	    td->td_retval));
614 }
615 
616 int
617 linux_msgsnd(struct thread *td, struct linux_msgsnd_args *args)
618 {
619 	const void *msgp;
620 	long mtype;
621 	l_long lmtype;
622 	int error;
623 
624 	if ((l_long)args->msgsz < 0 || args->msgsz > (l_long)msginfo.msgmax)
625 		return (EINVAL);
626 	msgp = PTRIN(args->msgp);
627 	if ((error = copyin(msgp, &lmtype, sizeof(lmtype))) != 0)
628 		return (error);
629 	mtype = (long)lmtype;
630 	return (kern_msgsnd(td, args->msqid,
631 	    (const char *)msgp + sizeof(lmtype),
632 	    args->msgsz, args->msgflg, mtype));
633 }
634 
635 int
636 linux_msgrcv(struct thread *td, struct linux_msgrcv_args *args)
637 {
638 	void *msgp;
639 	long mtype;
640 	l_long lmtype;
641 	int error;
642 
643 	if ((l_long)args->msgsz < 0 || args->msgsz > (l_long)msginfo.msgmax)
644 		return (EINVAL);
645 	msgp = PTRIN(args->msgp);
646 	if ((error = kern_msgrcv(td, args->msqid,
647 	    (char *)msgp + sizeof(lmtype), args->msgsz,
648 	    args->msgtyp, args->msgflg, &mtype)) != 0)
649 		return (error);
650 	lmtype = (l_long)mtype;
651 	return (copyout(&lmtype, msgp, sizeof(lmtype)));
652 }
653 
654 int
655 linux_msgget(struct thread *td, struct linux_msgget_args *args)
656 {
657 	struct msgget_args /* {
658 		key_t	key;
659 		int	msgflg;
660 	} */ bsd_args;
661 
662 	bsd_args.key = args->key;
663 	bsd_args.msgflg = args->msgflg;
664 	return (sys_msgget(td, &bsd_args));
665 }
666 
667 int
668 linux_msgctl(struct thread *td, struct linux_msgctl_args *args)
669 {
670 	int error, bsd_cmd;
671 	struct l_msqid_ds linux_msqid;
672 	struct msqid_ds bsd_msqid;
673 
674 	bsd_cmd = args->cmd & ~LINUX_IPC_64;
675 	switch (bsd_cmd) {
676 	case LINUX_IPC_INFO:
677 	case LINUX_MSG_INFO: {
678 		struct l_msginfo linux_msginfo;
679 
680 		/*
681 		 * XXX MSG_INFO uses the same data structure but returns different
682 		 * dynamic counters in msgpool, msgmap, and msgtql fields.
683 		 */
684 		linux_msginfo.msgpool = (long)msginfo.msgmni *
685 		    (long)msginfo.msgmnb / 1024L;	/* XXX MSG_INFO. */
686 		linux_msginfo.msgmap = msginfo.msgmnb;	/* XXX MSG_INFO. */
687 		linux_msginfo.msgmax = msginfo.msgmax;
688 		linux_msginfo.msgmnb = msginfo.msgmnb;
689 		linux_msginfo.msgmni = msginfo.msgmni;
690 		linux_msginfo.msgssz = msginfo.msgssz;
691 		linux_msginfo.msgtql = msginfo.msgtql;	/* XXX MSG_INFO. */
692 		linux_msginfo.msgseg = msginfo.msgseg;
693 		error = copyout(&linux_msginfo, PTRIN(args->buf),
694 		    sizeof(linux_msginfo));
695 		if (error == 0)
696 		    td->td_retval[0] = msginfo.msgmni;	/* XXX */
697 
698 		return (error);
699 	}
700 
701 	/*
702 	 * TODO: implement this
703 	 * case LINUX_MSG_STAT:
704 	 */
705 	case LINUX_IPC_STAT:
706 		/* NOTHING */
707 		break;
708 
709 	case LINUX_IPC_SET:
710 		error = linux_msqid_pullup(args->cmd & LINUX_IPC_64,
711 		    &linux_msqid, PTRIN(args->buf));
712 		if (error)
713 			return (error);
714 		linux_to_bsd_msqid_ds(&linux_msqid, &bsd_msqid);
715 		break;
716 
717 	case LINUX_IPC_RMID:
718 		/* NOTHING */
719 		break;
720 
721 	default:
722 		return (EINVAL);
723 		break;
724 	}
725 
726 	error = kern_msgctl(td, args->msqid, bsd_cmd, &bsd_msqid);
727 	if (error != 0)
728 		if (bsd_cmd != LINUX_IPC_RMID || error != EINVAL)
729 			return (error);
730 
731 	if (bsd_cmd == LINUX_IPC_STAT) {
732 		bsd_to_linux_msqid_ds(&bsd_msqid, &linux_msqid);
733 		return (linux_msqid_pushdown(args->cmd & LINUX_IPC_64,
734 		    &linux_msqid, PTRIN(args->buf)));
735 	}
736 
737 	return (0);
738 }
739 
740 int
741 linux_shmat(struct thread *td, struct linux_shmat_args *args)
742 {
743 	struct shmat_args /* {
744 		int shmid;
745 		void *shmaddr;
746 		int shmflg;
747 	} */ bsd_args;
748 	int error;
749 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
750 	l_uintptr_t addr;
751 #endif
752 
753 	bsd_args.shmid = args->shmid;
754 	bsd_args.shmaddr = PTRIN(args->shmaddr);
755 	bsd_args.shmflg = args->shmflg;
756 	if ((error = sys_shmat(td, &bsd_args)))
757 		return (error);
758 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
759 	addr = td->td_retval[0];
760 	if ((error = copyout(&addr, PTRIN(args->raddr), sizeof(addr))))
761 		return (error);
762 	td->td_retval[0] = 0;
763 #endif
764 	return (0);
765 }
766 
767 int
768 linux_shmdt(struct thread *td, struct linux_shmdt_args *args)
769 {
770 	struct shmdt_args /* {
771 		void *shmaddr;
772 	} */ bsd_args;
773 
774 	bsd_args.shmaddr = PTRIN(args->shmaddr);
775 	return (sys_shmdt(td, &bsd_args));
776 }
777 
778 int
779 linux_shmget(struct thread *td, struct linux_shmget_args *args)
780 {
781 	struct shmget_args /* {
782 		key_t key;
783 		int size;
784 		int shmflg;
785 	} */ bsd_args;
786 
787 	bsd_args.key = args->key;
788 	bsd_args.size = args->size;
789 	bsd_args.shmflg = args->shmflg;
790 	return (sys_shmget(td, &bsd_args));
791 }
792 
793 int
794 linux_shmctl(struct thread *td, struct linux_shmctl_args *args)
795 {
796 	struct l_shmid_ds linux_shmid;
797 	struct l_shminfo linux_shminfo;
798 	struct l_shm_info linux_shm_info;
799 	struct shmid_ds bsd_shmid;
800 	int error;
801 
802 	switch (args->cmd & ~LINUX_IPC_64) {
803 
804 	case LINUX_IPC_INFO: {
805 		struct shminfo bsd_shminfo;
806 
807 		/* Perform shmctl wanting removed segments lookup */
808 		error = kern_shmctl(td, args->shmid, IPC_INFO,
809 		    (void *)&bsd_shminfo, NULL);
810 		if (error)
811 			return (error);
812 
813 		bsd_to_linux_shminfo(&bsd_shminfo, &linux_shminfo);
814 
815 		return (linux_shminfo_pushdown(args->cmd & LINUX_IPC_64,
816 		    &linux_shminfo, PTRIN(args->buf)));
817 	}
818 
819 	case LINUX_SHM_INFO: {
820 		struct shm_info bsd_shm_info;
821 
822 		/* Perform shmctl wanting removed segments lookup */
823 		error = kern_shmctl(td, args->shmid, SHM_INFO,
824 		    (void *)&bsd_shm_info, NULL);
825 		if (error)
826 			return (error);
827 
828 		bsd_to_linux_shm_info(&bsd_shm_info, &linux_shm_info);
829 
830 		return (copyout(&linux_shm_info, PTRIN(args->buf),
831 		    sizeof(struct l_shm_info)));
832 	}
833 
834 	case LINUX_IPC_STAT:
835 		/* Perform shmctl wanting removed segments lookup */
836 		error = kern_shmctl(td, args->shmid, IPC_STAT,
837 		    (void *)&bsd_shmid, NULL);
838 		if (error)
839 			return (error);
840 
841 		bsd_to_linux_shmid_ds(&bsd_shmid, &linux_shmid);
842 
843 		return (linux_shmid_pushdown(args->cmd & LINUX_IPC_64,
844 		    &linux_shmid, PTRIN(args->buf)));
845 
846 	case LINUX_SHM_STAT:
847 		/* Perform shmctl wanting removed segments lookup */
848 		error = kern_shmctl(td, args->shmid, IPC_STAT,
849 		    (void *)&bsd_shmid, NULL);
850 		if (error)
851 			return (error);
852 
853 		bsd_to_linux_shmid_ds(&bsd_shmid, &linux_shmid);
854 
855 		return (linux_shmid_pushdown(args->cmd & LINUX_IPC_64,
856 		    &linux_shmid, PTRIN(args->buf)));
857 
858 	case LINUX_IPC_SET:
859 		error = linux_shmid_pullup(args->cmd & LINUX_IPC_64,
860 		    &linux_shmid, PTRIN(args->buf));
861 		if (error)
862 			return (error);
863 
864 		linux_to_bsd_shmid_ds(&linux_shmid, &bsd_shmid);
865 
866 		/* Perform shmctl wanting removed segments lookup */
867 		return (kern_shmctl(td, args->shmid, IPC_SET,
868 		    (void *)&bsd_shmid, NULL));
869 
870 	case LINUX_IPC_RMID: {
871 		void *buf;
872 
873 		if (args->buf == 0)
874 			buf = NULL;
875 		else {
876 			error = linux_shmid_pullup(args->cmd & LINUX_IPC_64,
877 			    &linux_shmid, PTRIN(args->buf));
878 			if (error)
879 				return (error);
880 			linux_to_bsd_shmid_ds(&linux_shmid, &bsd_shmid);
881 			buf = (void *)&bsd_shmid;
882 		}
883 		return (kern_shmctl(td, args->shmid, IPC_RMID, buf, NULL));
884 	}
885 
886 	case LINUX_SHM_LOCK:
887 		/* FALLTHROUGH */
888 	case LINUX_SHM_UNLOCK:
889 		/* FALLTHROUGH */
890 	default:
891 		linux_msg(td, "ipc type %d not implemented",
892 		    args->cmd & ~LINUX_IPC_64);
893 		return (EINVAL);
894 	}
895 }
896 
897 MODULE_DEPEND(linux, sysvmsg, 1, 1, 1);
898 MODULE_DEPEND(linux, sysvsem, 1, 1, 1);
899 MODULE_DEPEND(linux, sysvshm, 1, 1, 1);
900