xref: /freebsd/sys/kern/sysv_msg.c (revision 325151a3)
1 /*-
2  * Implementation of SVID messages
3  *
4  * Author:  Daniel Boulet
5  *
6  * Copyright 1993 Daniel Boulet and RTMX Inc.
7  *
8  * This system call was implemented by Daniel Boulet under contract from RTMX.
9  *
10  * Redistribution and use in source forms, with and without modification,
11  * are permitted provided that this entire comment appears intact.
12  *
13  * Redistribution in binary form may occur without any restrictions.
14  * Obviously, it would be nice if you gave credit where credit is due
15  * but requiring it would be too onerous.
16  *
17  * This software is provided ``AS IS'' without any warranties of any kind.
18  */
19 /*-
20  * Copyright (c) 2003-2005 McAfee, Inc.
21  * All rights reserved.
22  *
23  * This software was developed for the FreeBSD Project in part by McAfee
24  * Research, the Security Research Division of McAfee, Inc under DARPA/SPAWAR
25  * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research
26  * program.
27  *
28  * Redistribution and use in source and binary forms, with or without
29  * modification, are permitted provided that the following conditions
30  * are met:
31  * 1. Redistributions of source code must retain the above copyright
32  *    notice, this list of conditions and the following disclaimer.
33  * 2. Redistributions in binary form must reproduce the above copyright
34  *    notice, this list of conditions and the following disclaimer in the
35  *    documentation and/or other materials provided with the distribution.
36  *
37  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
38  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
39  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
40  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
41  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
42  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
43  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
45  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
46  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47  * SUCH DAMAGE.
48  */
49 
50 #include <sys/cdefs.h>
51 __FBSDID("$FreeBSD$");
52 
53 #include "opt_compat.h"
54 #include "opt_sysvipc.h"
55 
56 #include <sys/param.h>
57 #include <sys/systm.h>
58 #include <sys/sysproto.h>
59 #include <sys/kernel.h>
60 #include <sys/priv.h>
61 #include <sys/proc.h>
62 #include <sys/lock.h>
63 #include <sys/mutex.h>
64 #include <sys/module.h>
65 #include <sys/msg.h>
66 #include <sys/racct.h>
67 #include <sys/syscall.h>
68 #include <sys/syscallsubr.h>
69 #include <sys/sysent.h>
70 #include <sys/sysctl.h>
71 #include <sys/malloc.h>
72 #include <sys/jail.h>
73 
74 #include <security/mac/mac_framework.h>
75 
76 FEATURE(sysv_msg, "System V message queues support");
77 
78 static MALLOC_DEFINE(M_MSG, "msg", "SVID compatible message queues");
79 
80 static int msginit(void);
81 static int msgunload(void);
82 static int sysvmsg_modload(struct module *, int, void *);
83 
84 
85 #ifdef MSG_DEBUG
86 #define DPRINTF(a)	printf a
87 #else
88 #define DPRINTF(a)	(void)0
89 #endif
90 
91 static void msg_freehdr(struct msg *msghdr);
92 
93 #ifndef MSGSSZ
94 #define MSGSSZ	8		/* Each segment must be 2^N long */
95 #endif
96 #ifndef MSGSEG
97 #define MSGSEG	2048		/* must be less than 32767 */
98 #endif
99 #define MSGMAX	(MSGSSZ*MSGSEG)
100 #ifndef MSGMNB
101 #define MSGMNB	2048		/* max # of bytes in a queue */
102 #endif
103 #ifndef MSGMNI
104 #define MSGMNI	40
105 #endif
106 #ifndef MSGTQL
107 #define MSGTQL	40
108 #endif
109 
110 /*
111  * Based on the configuration parameters described in an SVR2 (yes, two)
112  * config(1m) man page.
113  *
114  * Each message is broken up and stored in segments that are msgssz bytes
115  * long.  For efficiency reasons, this should be a power of two.  Also,
116  * it doesn't make sense if it is less than 8 or greater than about 256.
117  * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of
118  * two between 8 and 1024 inclusive (and panic's if it isn't).
119  */
120 struct msginfo msginfo = {
121                 MSGMAX,         /* max chars in a message */
122                 MSGMNI,         /* # of message queue identifiers */
123                 MSGMNB,         /* max chars in a queue */
124                 MSGTQL,         /* max messages in system */
125                 MSGSSZ,         /* size of a message segment */
126                 		/* (must be small power of 2 greater than 4) */
127                 MSGSEG          /* number of message segments */
128 };
129 
130 /*
131  * macros to convert between msqid_ds's and msqid's.
132  * (specific to this implementation)
133  */
134 #define MSQID(ix,ds)	((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000))
135 #define MSQID_IX(id)	((id) & 0xffff)
136 #define MSQID_SEQ(id)	(((id) >> 16) & 0xffff)
137 
138 /*
139  * The rest of this file is specific to this particular implementation.
140  */
141 
142 struct msgmap {
143 	short	next;		/* next segment in buffer */
144     				/* -1 -> available */
145     				/* 0..(MSGSEG-1) -> index of next segment */
146 };
147 
148 #define MSG_LOCKED	01000	/* Is this msqid_ds locked? */
149 
150 static int nfree_msgmaps;	/* # of free map entries */
151 static short free_msgmaps;	/* head of linked list of free map entries */
152 static struct msg *free_msghdrs;/* list of free msg headers */
153 static char *msgpool;		/* MSGMAX byte long msg buffer pool */
154 static struct msgmap *msgmaps;	/* MSGSEG msgmap structures */
155 static struct msg *msghdrs;	/* MSGTQL msg headers */
156 static struct msqid_kernel *msqids;	/* MSGMNI msqid_kernel struct's */
157 static struct mtx msq_mtx;	/* global mutex for message queues. */
158 
159 static struct syscall_helper_data msg_syscalls[] = {
160 	SYSCALL_INIT_HELPER(msgctl),
161 	SYSCALL_INIT_HELPER(msgget),
162 	SYSCALL_INIT_HELPER(msgsnd),
163 	SYSCALL_INIT_HELPER(msgrcv),
164 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
165     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
166 	SYSCALL_INIT_HELPER(msgsys),
167 	SYSCALL_INIT_HELPER_COMPAT(freebsd7_msgctl),
168 #endif
169 	SYSCALL_INIT_LAST
170 };
171 
172 #ifdef COMPAT_FREEBSD32
173 #include <compat/freebsd32/freebsd32.h>
174 #include <compat/freebsd32/freebsd32_ipc.h>
175 #include <compat/freebsd32/freebsd32_proto.h>
176 #include <compat/freebsd32/freebsd32_signal.h>
177 #include <compat/freebsd32/freebsd32_syscall.h>
178 #include <compat/freebsd32/freebsd32_util.h>
179 
180 static struct syscall_helper_data msg32_syscalls[] = {
181 	SYSCALL32_INIT_HELPER(freebsd32_msgctl),
182 	SYSCALL32_INIT_HELPER(freebsd32_msgsnd),
183 	SYSCALL32_INIT_HELPER(freebsd32_msgrcv),
184 	SYSCALL32_INIT_HELPER_COMPAT(msgget),
185 	SYSCALL32_INIT_HELPER(freebsd32_msgsys),
186 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
187     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
188 	SYSCALL32_INIT_HELPER(freebsd7_freebsd32_msgctl),
189 #endif
190 	SYSCALL_INIT_LAST
191 };
192 #endif
193 
194 static int
195 msginit()
196 {
197 	int i, error;
198 
199 	msginfo.msgmax = msginfo.msgseg * msginfo.msgssz;
200 	msgpool = malloc(msginfo.msgmax, M_MSG, M_WAITOK);
201 	msgmaps = malloc(sizeof(struct msgmap) * msginfo.msgseg, M_MSG, M_WAITOK);
202 	msghdrs = malloc(sizeof(struct msg) * msginfo.msgtql, M_MSG, M_WAITOK);
203 	msqids = malloc(sizeof(struct msqid_kernel) * msginfo.msgmni, M_MSG,
204 	    M_WAITOK);
205 
206 	/*
207 	 * msginfo.msgssz should be a power of two for efficiency reasons.
208 	 * It is also pretty silly if msginfo.msgssz is less than 8
209 	 * or greater than about 256 so ...
210 	 */
211 
212 	i = 8;
213 	while (i < 1024 && i != msginfo.msgssz)
214 		i <<= 1;
215     	if (i != msginfo.msgssz) {
216 		DPRINTF(("msginfo.msgssz=%d (0x%x)\n", msginfo.msgssz,
217 		    msginfo.msgssz));
218 		panic("msginfo.msgssz not a small power of 2");
219 	}
220 
221 	if (msginfo.msgseg > 32767) {
222 		DPRINTF(("msginfo.msgseg=%d\n", msginfo.msgseg));
223 		panic("msginfo.msgseg > 32767");
224 	}
225 
226 	for (i = 0; i < msginfo.msgseg; i++) {
227 		if (i > 0)
228 			msgmaps[i-1].next = i;
229 		msgmaps[i].next = -1;	/* implies entry is available */
230 	}
231 	free_msgmaps = 0;
232 	nfree_msgmaps = msginfo.msgseg;
233 
234 	for (i = 0; i < msginfo.msgtql; i++) {
235 		msghdrs[i].msg_type = 0;
236 		if (i > 0)
237 			msghdrs[i-1].msg_next = &msghdrs[i];
238 		msghdrs[i].msg_next = NULL;
239 #ifdef MAC
240 		mac_sysvmsg_init(&msghdrs[i]);
241 #endif
242     	}
243 	free_msghdrs = &msghdrs[0];
244 
245 	for (i = 0; i < msginfo.msgmni; i++) {
246 		msqids[i].u.msg_qbytes = 0;	/* implies entry is available */
247 		msqids[i].u.msg_perm.seq = 0;	/* reset to a known value */
248 		msqids[i].u.msg_perm.mode = 0;
249 #ifdef MAC
250 		mac_sysvmsq_init(&msqids[i]);
251 #endif
252 	}
253 	mtx_init(&msq_mtx, "msq", NULL, MTX_DEF);
254 
255 	error = syscall_helper_register(msg_syscalls, SY_THR_STATIC_KLD);
256 	if (error != 0)
257 		return (error);
258 #ifdef COMPAT_FREEBSD32
259 	error = syscall32_helper_register(msg32_syscalls, SY_THR_STATIC_KLD);
260 	if (error != 0)
261 		return (error);
262 #endif
263 	return (0);
264 }
265 
266 static int
267 msgunload()
268 {
269 	struct msqid_kernel *msqkptr;
270 	int msqid;
271 #ifdef MAC
272 	int i;
273 #endif
274 
275 	syscall_helper_unregister(msg_syscalls);
276 #ifdef COMPAT_FREEBSD32
277 	syscall32_helper_unregister(msg32_syscalls);
278 #endif
279 
280 	for (msqid = 0; msqid < msginfo.msgmni; msqid++) {
281 		/*
282 		 * Look for an unallocated and unlocked msqid_ds.
283 		 * msqid_ds's can be locked by msgsnd or msgrcv while
284 		 * they are copying the message in/out.  We can't
285 		 * re-use the entry until they release it.
286 		 */
287 		msqkptr = &msqids[msqid];
288 		if (msqkptr->u.msg_qbytes != 0 ||
289 		    (msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0)
290 			break;
291 	}
292 	if (msqid != msginfo.msgmni)
293 		return (EBUSY);
294 
295 #ifdef MAC
296 	for (i = 0; i < msginfo.msgtql; i++)
297 		mac_sysvmsg_destroy(&msghdrs[i]);
298 	for (msqid = 0; msqid < msginfo.msgmni; msqid++)
299 		mac_sysvmsq_destroy(&msqids[msqid]);
300 #endif
301 	free(msgpool, M_MSG);
302 	free(msgmaps, M_MSG);
303 	free(msghdrs, M_MSG);
304 	free(msqids, M_MSG);
305 	mtx_destroy(&msq_mtx);
306 	return (0);
307 }
308 
309 
310 static int
311 sysvmsg_modload(struct module *module, int cmd, void *arg)
312 {
313 	int error = 0;
314 
315 	switch (cmd) {
316 	case MOD_LOAD:
317 		error = msginit();
318 		if (error != 0)
319 			msgunload();
320 		break;
321 	case MOD_UNLOAD:
322 		error = msgunload();
323 		break;
324 	case MOD_SHUTDOWN:
325 		break;
326 	default:
327 		error = EINVAL;
328 		break;
329 	}
330 	return (error);
331 }
332 
333 static moduledata_t sysvmsg_mod = {
334 	"sysvmsg",
335 	&sysvmsg_modload,
336 	NULL
337 };
338 
339 DECLARE_MODULE(sysvmsg, sysvmsg_mod, SI_SUB_SYSV_MSG, SI_ORDER_FIRST);
340 MODULE_VERSION(sysvmsg, 1);
341 
342 static void
343 msg_freehdr(msghdr)
344 	struct msg *msghdr;
345 {
346 	while (msghdr->msg_ts > 0) {
347 		short next;
348 		if (msghdr->msg_spot < 0 || msghdr->msg_spot >= msginfo.msgseg)
349 			panic("msghdr->msg_spot out of range");
350 		next = msgmaps[msghdr->msg_spot].next;
351 		msgmaps[msghdr->msg_spot].next = free_msgmaps;
352 		free_msgmaps = msghdr->msg_spot;
353 		nfree_msgmaps++;
354 		msghdr->msg_spot = next;
355 		if (msghdr->msg_ts >= msginfo.msgssz)
356 			msghdr->msg_ts -= msginfo.msgssz;
357 		else
358 			msghdr->msg_ts = 0;
359 	}
360 	if (msghdr->msg_spot != -1)
361 		panic("msghdr->msg_spot != -1");
362 	msghdr->msg_next = free_msghdrs;
363 	free_msghdrs = msghdr;
364 #ifdef MAC
365 	mac_sysvmsg_cleanup(msghdr);
366 #endif
367 }
368 
369 #ifndef _SYS_SYSPROTO_H_
370 struct msgctl_args {
371 	int	msqid;
372 	int	cmd;
373 	struct	msqid_ds *buf;
374 };
375 #endif
376 int
377 sys_msgctl(td, uap)
378 	struct thread *td;
379 	register struct msgctl_args *uap;
380 {
381 	int msqid = uap->msqid;
382 	int cmd = uap->cmd;
383 	struct msqid_ds msqbuf;
384 	int error;
385 
386 	DPRINTF(("call to msgctl(%d, %d, %p)\n", msqid, cmd, uap->buf));
387 	if (cmd == IPC_SET &&
388 	    (error = copyin(uap->buf, &msqbuf, sizeof(msqbuf))) != 0)
389 		return (error);
390 	error = kern_msgctl(td, msqid, cmd, &msqbuf);
391 	if (cmd == IPC_STAT && error == 0)
392 		error = copyout(&msqbuf, uap->buf, sizeof(struct msqid_ds));
393 	return (error);
394 }
395 
396 int
397 kern_msgctl(td, msqid, cmd, msqbuf)
398 	struct thread *td;
399 	int msqid;
400 	int cmd;
401 	struct msqid_ds *msqbuf;
402 {
403 	int rval, error, msqix;
404 	register struct msqid_kernel *msqkptr;
405 
406 	if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
407 		return (ENOSYS);
408 
409 	msqix = IPCID_TO_IX(msqid);
410 
411 	if (msqix < 0 || msqix >= msginfo.msgmni) {
412 		DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix,
413 		    msginfo.msgmni));
414 		return (EINVAL);
415 	}
416 
417 	msqkptr = &msqids[msqix];
418 
419 	mtx_lock(&msq_mtx);
420 	if (msqkptr->u.msg_qbytes == 0) {
421 		DPRINTF(("no such msqid\n"));
422 		error = EINVAL;
423 		goto done2;
424 	}
425 	if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
426 		DPRINTF(("wrong sequence number\n"));
427 		error = EINVAL;
428 		goto done2;
429 	}
430 #ifdef MAC
431 	error = mac_sysvmsq_check_msqctl(td->td_ucred, msqkptr, cmd);
432 	if (error != 0)
433 		goto done2;
434 #endif
435 
436 	error = 0;
437 	rval = 0;
438 
439 	switch (cmd) {
440 
441 	case IPC_RMID:
442 	{
443 		struct msg *msghdr;
444 		if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M)))
445 			goto done2;
446 
447 #ifdef MAC
448 		/*
449 		 * Check that the thread has MAC access permissions to
450 		 * individual msghdrs.  Note: We need to do this in a
451 		 * separate loop because the actual loop alters the
452 		 * msq/msghdr info as it progresses, and there is no going
453 		 * back if half the way through we discover that the
454 		 * thread cannot free a certain msghdr.  The msq will get
455 		 * into an inconsistent state.
456 		 */
457 		for (msghdr = msqkptr->u.msg_first; msghdr != NULL;
458 		    msghdr = msghdr->msg_next) {
459 			error = mac_sysvmsq_check_msgrmid(td->td_ucred, msghdr);
460 			if (error != 0)
461 				goto done2;
462 		}
463 #endif
464 
465 		racct_sub_cred(msqkptr->cred, RACCT_NMSGQ, 1);
466 		racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, msqkptr->u.msg_qnum);
467 		racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msqkptr->u.msg_cbytes);
468 		crfree(msqkptr->cred);
469 		msqkptr->cred = NULL;
470 
471 		/* Free the message headers */
472 		msghdr = msqkptr->u.msg_first;
473 		while (msghdr != NULL) {
474 			struct msg *msghdr_tmp;
475 
476 			/* Free the segments of each message */
477 			msqkptr->u.msg_cbytes -= msghdr->msg_ts;
478 			msqkptr->u.msg_qnum--;
479 			msghdr_tmp = msghdr;
480 			msghdr = msghdr->msg_next;
481 			msg_freehdr(msghdr_tmp);
482 		}
483 
484 		if (msqkptr->u.msg_cbytes != 0)
485 			panic("msg_cbytes is screwed up");
486 		if (msqkptr->u.msg_qnum != 0)
487 			panic("msg_qnum is screwed up");
488 
489 		msqkptr->u.msg_qbytes = 0;	/* Mark it as free */
490 
491 #ifdef MAC
492 		mac_sysvmsq_cleanup(msqkptr);
493 #endif
494 
495 		wakeup(msqkptr);
496 	}
497 
498 		break;
499 
500 	case IPC_SET:
501 		if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M)))
502 			goto done2;
503 		if (msqbuf->msg_qbytes > msqkptr->u.msg_qbytes) {
504 			error = priv_check(td, PRIV_IPC_MSGSIZE);
505 			if (error)
506 				goto done2;
507 		}
508 		if (msqbuf->msg_qbytes > msginfo.msgmnb) {
509 			DPRINTF(("can't increase msg_qbytes beyond %d"
510 			    "(truncating)\n", msginfo.msgmnb));
511 			msqbuf->msg_qbytes = msginfo.msgmnb;	/* silently restrict qbytes to system limit */
512 		}
513 		if (msqbuf->msg_qbytes == 0) {
514 			DPRINTF(("can't reduce msg_qbytes to 0\n"));
515 			error = EINVAL;		/* non-standard errno! */
516 			goto done2;
517 		}
518 		msqkptr->u.msg_perm.uid = msqbuf->msg_perm.uid;	/* change the owner */
519 		msqkptr->u.msg_perm.gid = msqbuf->msg_perm.gid;	/* change the owner */
520 		msqkptr->u.msg_perm.mode = (msqkptr->u.msg_perm.mode & ~0777) |
521 		    (msqbuf->msg_perm.mode & 0777);
522 		msqkptr->u.msg_qbytes = msqbuf->msg_qbytes;
523 		msqkptr->u.msg_ctime = time_second;
524 		break;
525 
526 	case IPC_STAT:
527 		if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) {
528 			DPRINTF(("requester doesn't have read access\n"));
529 			goto done2;
530 		}
531 		*msqbuf = msqkptr->u;
532 		break;
533 
534 	default:
535 		DPRINTF(("invalid command %d\n", cmd));
536 		error = EINVAL;
537 		goto done2;
538 	}
539 
540 	if (error == 0)
541 		td->td_retval[0] = rval;
542 done2:
543 	mtx_unlock(&msq_mtx);
544 	return (error);
545 }
546 
547 #ifndef _SYS_SYSPROTO_H_
548 struct msgget_args {
549 	key_t	key;
550 	int	msgflg;
551 };
552 #endif
553 
554 int
555 sys_msgget(td, uap)
556 	struct thread *td;
557 	register struct msgget_args *uap;
558 {
559 	int msqid, error = 0;
560 	int key = uap->key;
561 	int msgflg = uap->msgflg;
562 	struct ucred *cred = td->td_ucred;
563 	register struct msqid_kernel *msqkptr = NULL;
564 
565 	DPRINTF(("msgget(0x%x, 0%o)\n", key, msgflg));
566 
567 	if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
568 		return (ENOSYS);
569 
570 	mtx_lock(&msq_mtx);
571 	if (key != IPC_PRIVATE) {
572 		for (msqid = 0; msqid < msginfo.msgmni; msqid++) {
573 			msqkptr = &msqids[msqid];
574 			if (msqkptr->u.msg_qbytes != 0 &&
575 			    msqkptr->u.msg_perm.key == key)
576 				break;
577 		}
578 		if (msqid < msginfo.msgmni) {
579 			DPRINTF(("found public key\n"));
580 			if ((msgflg & IPC_CREAT) && (msgflg & IPC_EXCL)) {
581 				DPRINTF(("not exclusive\n"));
582 				error = EEXIST;
583 				goto done2;
584 			}
585 			if ((error = ipcperm(td, &msqkptr->u.msg_perm,
586 			    msgflg & 0700))) {
587 				DPRINTF(("requester doesn't have 0%o access\n",
588 				    msgflg & 0700));
589 				goto done2;
590 			}
591 #ifdef MAC
592 			error = mac_sysvmsq_check_msqget(cred, msqkptr);
593 			if (error != 0)
594 				goto done2;
595 #endif
596 			goto found;
597 		}
598 	}
599 
600 	DPRINTF(("need to allocate the msqid_ds\n"));
601 	if (key == IPC_PRIVATE || (msgflg & IPC_CREAT)) {
602 		for (msqid = 0; msqid < msginfo.msgmni; msqid++) {
603 			/*
604 			 * Look for an unallocated and unlocked msqid_ds.
605 			 * msqid_ds's can be locked by msgsnd or msgrcv while
606 			 * they are copying the message in/out.  We can't
607 			 * re-use the entry until they release it.
608 			 */
609 			msqkptr = &msqids[msqid];
610 			if (msqkptr->u.msg_qbytes == 0 &&
611 			    (msqkptr->u.msg_perm.mode & MSG_LOCKED) == 0)
612 				break;
613 		}
614 		if (msqid == msginfo.msgmni) {
615 			DPRINTF(("no more msqid_ds's available\n"));
616 			error = ENOSPC;
617 			goto done2;
618 		}
619 #ifdef RACCT
620 		if (racct_enable) {
621 			PROC_LOCK(td->td_proc);
622 			error = racct_add(td->td_proc, RACCT_NMSGQ, 1);
623 			PROC_UNLOCK(td->td_proc);
624 			if (error != 0) {
625 				error = ENOSPC;
626 				goto done2;
627 			}
628 		}
629 #endif
630 		DPRINTF(("msqid %d is available\n", msqid));
631 		msqkptr->u.msg_perm.key = key;
632 		msqkptr->u.msg_perm.cuid = cred->cr_uid;
633 		msqkptr->u.msg_perm.uid = cred->cr_uid;
634 		msqkptr->u.msg_perm.cgid = cred->cr_gid;
635 		msqkptr->u.msg_perm.gid = cred->cr_gid;
636 		msqkptr->u.msg_perm.mode = (msgflg & 0777);
637 		msqkptr->cred = crhold(cred);
638 		/* Make sure that the returned msqid is unique */
639 		msqkptr->u.msg_perm.seq = (msqkptr->u.msg_perm.seq + 1) & 0x7fff;
640 		msqkptr->u.msg_first = NULL;
641 		msqkptr->u.msg_last = NULL;
642 		msqkptr->u.msg_cbytes = 0;
643 		msqkptr->u.msg_qnum = 0;
644 		msqkptr->u.msg_qbytes = msginfo.msgmnb;
645 		msqkptr->u.msg_lspid = 0;
646 		msqkptr->u.msg_lrpid = 0;
647 		msqkptr->u.msg_stime = 0;
648 		msqkptr->u.msg_rtime = 0;
649 		msqkptr->u.msg_ctime = time_second;
650 #ifdef MAC
651 		mac_sysvmsq_create(cred, msqkptr);
652 #endif
653 	} else {
654 		DPRINTF(("didn't find it and wasn't asked to create it\n"));
655 		error = ENOENT;
656 		goto done2;
657 	}
658 
659 found:
660 	/* Construct the unique msqid */
661 	td->td_retval[0] = IXSEQ_TO_IPCID(msqid, msqkptr->u.msg_perm);
662 done2:
663 	mtx_unlock(&msq_mtx);
664 	return (error);
665 }
666 
667 #ifndef _SYS_SYSPROTO_H_
668 struct msgsnd_args {
669 	int	msqid;
670 	const void	*msgp;
671 	size_t	msgsz;
672 	int	msgflg;
673 };
674 #endif
675 int
676 kern_msgsnd(td, msqid, msgp, msgsz, msgflg, mtype)
677 	struct thread *td;
678 	int msqid;
679 	const void *msgp;	/* XXX msgp is actually mtext. */
680 	size_t msgsz;
681 	int msgflg;
682 	long mtype;
683 {
684 	int msqix, segs_needed, error = 0;
685 	register struct msqid_kernel *msqkptr;
686 	register struct msg *msghdr;
687 	short next;
688 #ifdef RACCT
689 	size_t saved_msgsz;
690 #endif
691 
692 	if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
693 		return (ENOSYS);
694 
695 	mtx_lock(&msq_mtx);
696 	msqix = IPCID_TO_IX(msqid);
697 
698 	if (msqix < 0 || msqix >= msginfo.msgmni) {
699 		DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix,
700 		    msginfo.msgmni));
701 		error = EINVAL;
702 		goto done2;
703 	}
704 
705 	msqkptr = &msqids[msqix];
706 	if (msqkptr->u.msg_qbytes == 0) {
707 		DPRINTF(("no such message queue id\n"));
708 		error = EINVAL;
709 		goto done2;
710 	}
711 	if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
712 		DPRINTF(("wrong sequence number\n"));
713 		error = EINVAL;
714 		goto done2;
715 	}
716 
717 	if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_W))) {
718 		DPRINTF(("requester doesn't have write access\n"));
719 		goto done2;
720 	}
721 
722 #ifdef MAC
723 	error = mac_sysvmsq_check_msqsnd(td->td_ucred, msqkptr);
724 	if (error != 0)
725 		goto done2;
726 #endif
727 
728 #ifdef RACCT
729 	if (racct_enable) {
730 		PROC_LOCK(td->td_proc);
731 		if (racct_add(td->td_proc, RACCT_MSGQQUEUED, 1)) {
732 			PROC_UNLOCK(td->td_proc);
733 			error = EAGAIN;
734 			goto done2;
735 		}
736 		saved_msgsz = msgsz;
737 		if (racct_add(td->td_proc, RACCT_MSGQSIZE, msgsz)) {
738 			racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1);
739 			PROC_UNLOCK(td->td_proc);
740 			error = EAGAIN;
741 			goto done2;
742 		}
743 		PROC_UNLOCK(td->td_proc);
744 	}
745 #endif
746 
747 	segs_needed = (msgsz + msginfo.msgssz - 1) / msginfo.msgssz;
748 	DPRINTF(("msgsz=%zu, msgssz=%d, segs_needed=%d\n", msgsz,
749 	    msginfo.msgssz, segs_needed));
750 	for (;;) {
751 		int need_more_resources = 0;
752 
753 		/*
754 		 * check msgsz
755 		 * (inside this loop in case msg_qbytes changes while we sleep)
756 		 */
757 
758 		if (msgsz > msqkptr->u.msg_qbytes) {
759 			DPRINTF(("msgsz > msqkptr->u.msg_qbytes\n"));
760 			error = EINVAL;
761 			goto done3;
762 		}
763 
764 		if (msqkptr->u.msg_perm.mode & MSG_LOCKED) {
765 			DPRINTF(("msqid is locked\n"));
766 			need_more_resources = 1;
767 		}
768 		if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) {
769 			DPRINTF(("msgsz + msg_cbytes > msg_qbytes\n"));
770 			need_more_resources = 1;
771 		}
772 		if (segs_needed > nfree_msgmaps) {
773 			DPRINTF(("segs_needed > nfree_msgmaps\n"));
774 			need_more_resources = 1;
775 		}
776 		if (free_msghdrs == NULL) {
777 			DPRINTF(("no more msghdrs\n"));
778 			need_more_resources = 1;
779 		}
780 
781 		if (need_more_resources) {
782 			int we_own_it;
783 
784 			if ((msgflg & IPC_NOWAIT) != 0) {
785 				DPRINTF(("need more resources but caller "
786 				    "doesn't want to wait\n"));
787 				error = EAGAIN;
788 				goto done3;
789 			}
790 
791 			if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) {
792 				DPRINTF(("we don't own the msqid_ds\n"));
793 				we_own_it = 0;
794 			} else {
795 				/* Force later arrivals to wait for our
796 				   request */
797 				DPRINTF(("we own the msqid_ds\n"));
798 				msqkptr->u.msg_perm.mode |= MSG_LOCKED;
799 				we_own_it = 1;
800 			}
801 			DPRINTF(("msgsnd:  goodnight\n"));
802 			error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH,
803 			    "msgsnd", hz);
804 			DPRINTF(("msgsnd:  good morning, error=%d\n", error));
805 			if (we_own_it)
806 				msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
807 			if (error == EWOULDBLOCK) {
808 				DPRINTF(("msgsnd:  timed out\n"));
809 				continue;
810 			}
811 			if (error != 0) {
812 				DPRINTF(("msgsnd:  interrupted system call\n"));
813 				error = EINTR;
814 				goto done3;
815 			}
816 
817 			/*
818 			 * Make sure that the msq queue still exists
819 			 */
820 
821 			if (msqkptr->u.msg_qbytes == 0) {
822 				DPRINTF(("msqid deleted\n"));
823 				error = EIDRM;
824 				goto done3;
825 			}
826 
827 		} else {
828 			DPRINTF(("got all the resources that we need\n"));
829 			break;
830 		}
831 	}
832 
833 	/*
834 	 * We have the resources that we need.
835 	 * Make sure!
836 	 */
837 
838 	if (msqkptr->u.msg_perm.mode & MSG_LOCKED)
839 		panic("msg_perm.mode & MSG_LOCKED");
840 	if (segs_needed > nfree_msgmaps)
841 		panic("segs_needed > nfree_msgmaps");
842 	if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes)
843 		panic("msgsz + msg_cbytes > msg_qbytes");
844 	if (free_msghdrs == NULL)
845 		panic("no more msghdrs");
846 
847 	/*
848 	 * Re-lock the msqid_ds in case we page-fault when copying in the
849 	 * message
850 	 */
851 
852 	if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0)
853 		panic("msqid_ds is already locked");
854 	msqkptr->u.msg_perm.mode |= MSG_LOCKED;
855 
856 	/*
857 	 * Allocate a message header
858 	 */
859 
860 	msghdr = free_msghdrs;
861 	free_msghdrs = msghdr->msg_next;
862 	msghdr->msg_spot = -1;
863 	msghdr->msg_ts = msgsz;
864 	msghdr->msg_type = mtype;
865 #ifdef MAC
866 	/*
867 	 * XXXMAC: Should the mac_sysvmsq_check_msgmsq check follow here
868 	 * immediately?  Or, should it be checked just before the msg is
869 	 * enqueued in the msgq (as it is done now)?
870 	 */
871 	mac_sysvmsg_create(td->td_ucred, msqkptr, msghdr);
872 #endif
873 
874 	/*
875 	 * Allocate space for the message
876 	 */
877 
878 	while (segs_needed > 0) {
879 		if (nfree_msgmaps <= 0)
880 			panic("not enough msgmaps");
881 		if (free_msgmaps == -1)
882 			panic("nil free_msgmaps");
883 		next = free_msgmaps;
884 		if (next <= -1)
885 			panic("next too low #1");
886 		if (next >= msginfo.msgseg)
887 			panic("next out of range #1");
888 		DPRINTF(("allocating segment %d to message\n", next));
889 		free_msgmaps = msgmaps[next].next;
890 		nfree_msgmaps--;
891 		msgmaps[next].next = msghdr->msg_spot;
892 		msghdr->msg_spot = next;
893 		segs_needed--;
894 	}
895 
896 	/*
897 	 * Validate the message type
898 	 */
899 
900 	if (msghdr->msg_type < 1) {
901 		msg_freehdr(msghdr);
902 		msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
903 		wakeup(msqkptr);
904 		DPRINTF(("mtype (%ld) < 1\n", msghdr->msg_type));
905 		error = EINVAL;
906 		goto done3;
907 	}
908 
909 	/*
910 	 * Copy in the message body
911 	 */
912 
913 	next = msghdr->msg_spot;
914 	while (msgsz > 0) {
915 		size_t tlen;
916 		if (msgsz > msginfo.msgssz)
917 			tlen = msginfo.msgssz;
918 		else
919 			tlen = msgsz;
920 		if (next <= -1)
921 			panic("next too low #2");
922 		if (next >= msginfo.msgseg)
923 			panic("next out of range #2");
924 		mtx_unlock(&msq_mtx);
925 		if ((error = copyin(msgp, &msgpool[next * msginfo.msgssz],
926 		    tlen)) != 0) {
927 			mtx_lock(&msq_mtx);
928 			DPRINTF(("error %d copying in message segment\n",
929 			    error));
930 			msg_freehdr(msghdr);
931 			msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
932 			wakeup(msqkptr);
933 			goto done3;
934 		}
935 		mtx_lock(&msq_mtx);
936 		msgsz -= tlen;
937 		msgp = (const char *)msgp + tlen;
938 		next = msgmaps[next].next;
939 	}
940 	if (next != -1)
941 		panic("didn't use all the msg segments");
942 
943 	/*
944 	 * We've got the message.  Unlock the msqid_ds.
945 	 */
946 
947 	msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
948 
949 	/*
950 	 * Make sure that the msqid_ds is still allocated.
951 	 */
952 
953 	if (msqkptr->u.msg_qbytes == 0) {
954 		msg_freehdr(msghdr);
955 		wakeup(msqkptr);
956 		error = EIDRM;
957 		goto done3;
958 	}
959 
960 #ifdef MAC
961 	/*
962 	 * Note: Since the task/thread allocates the msghdr and usually
963 	 * primes it with its own MAC label, for a majority of policies, it
964 	 * won't be necessary to check whether the msghdr has access
965 	 * permissions to the msgq.  The mac_sysvmsq_check_msqsnd check would
966 	 * suffice in that case.  However, this hook may be required where
967 	 * individual policies derive a non-identical label for the msghdr
968 	 * from the current thread label and may want to check the msghdr
969 	 * enqueue permissions, along with read/write permissions to the
970 	 * msgq.
971 	 */
972 	error = mac_sysvmsq_check_msgmsq(td->td_ucred, msghdr, msqkptr);
973 	if (error != 0) {
974 		msg_freehdr(msghdr);
975 		wakeup(msqkptr);
976 		goto done3;
977 	}
978 #endif
979 
980 	/*
981 	 * Put the message into the queue
982 	 */
983 	if (msqkptr->u.msg_first == NULL) {
984 		msqkptr->u.msg_first = msghdr;
985 		msqkptr->u.msg_last = msghdr;
986 	} else {
987 		msqkptr->u.msg_last->msg_next = msghdr;
988 		msqkptr->u.msg_last = msghdr;
989 	}
990 	msqkptr->u.msg_last->msg_next = NULL;
991 
992 	msqkptr->u.msg_cbytes += msghdr->msg_ts;
993 	msqkptr->u.msg_qnum++;
994 	msqkptr->u.msg_lspid = td->td_proc->p_pid;
995 	msqkptr->u.msg_stime = time_second;
996 
997 	wakeup(msqkptr);
998 	td->td_retval[0] = 0;
999 done3:
1000 #ifdef RACCT
1001 	if (racct_enable && error != 0) {
1002 		PROC_LOCK(td->td_proc);
1003 		racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1);
1004 		racct_sub(td->td_proc, RACCT_MSGQSIZE, saved_msgsz);
1005 		PROC_UNLOCK(td->td_proc);
1006 	}
1007 #endif
1008 done2:
1009 	mtx_unlock(&msq_mtx);
1010 	return (error);
1011 }
1012 
1013 int
1014 sys_msgsnd(td, uap)
1015 	struct thread *td;
1016 	register struct msgsnd_args *uap;
1017 {
1018 	int error;
1019 	long mtype;
1020 
1021 	DPRINTF(("call to msgsnd(%d, %p, %zu, %d)\n", uap->msqid, uap->msgp,
1022 	    uap->msgsz, uap->msgflg));
1023 
1024 	if ((error = copyin(uap->msgp, &mtype, sizeof(mtype))) != 0) {
1025 		DPRINTF(("error %d copying the message type\n", error));
1026 		return (error);
1027 	}
1028 	return (kern_msgsnd(td, uap->msqid,
1029 	    (const char *)uap->msgp + sizeof(mtype),
1030 	    uap->msgsz, uap->msgflg, mtype));
1031 }
1032 
1033 #ifndef _SYS_SYSPROTO_H_
1034 struct msgrcv_args {
1035 	int	msqid;
1036 	void	*msgp;
1037 	size_t	msgsz;
1038 	long	msgtyp;
1039 	int	msgflg;
1040 };
1041 #endif
1042 int
1043 kern_msgrcv(td, msqid, msgp, msgsz, msgtyp, msgflg, mtype)
1044 	struct thread *td;
1045 	int msqid;
1046 	void *msgp;	/* XXX msgp is actually mtext. */
1047 	size_t msgsz;
1048 	long msgtyp;
1049 	int msgflg;
1050 	long *mtype;
1051 {
1052 	size_t len;
1053 	register struct msqid_kernel *msqkptr;
1054 	register struct msg *msghdr;
1055 	int msqix, error = 0;
1056 	short next;
1057 
1058 	if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
1059 		return (ENOSYS);
1060 
1061 	msqix = IPCID_TO_IX(msqid);
1062 
1063 	if (msqix < 0 || msqix >= msginfo.msgmni) {
1064 		DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix,
1065 		    msginfo.msgmni));
1066 		return (EINVAL);
1067 	}
1068 
1069 	msqkptr = &msqids[msqix];
1070 	mtx_lock(&msq_mtx);
1071 	if (msqkptr->u.msg_qbytes == 0) {
1072 		DPRINTF(("no such message queue id\n"));
1073 		error = EINVAL;
1074 		goto done2;
1075 	}
1076 	if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
1077 		DPRINTF(("wrong sequence number\n"));
1078 		error = EINVAL;
1079 		goto done2;
1080 	}
1081 
1082 	if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) {
1083 		DPRINTF(("requester doesn't have read access\n"));
1084 		goto done2;
1085 	}
1086 
1087 #ifdef MAC
1088 	error = mac_sysvmsq_check_msqrcv(td->td_ucred, msqkptr);
1089 	if (error != 0)
1090 		goto done2;
1091 #endif
1092 
1093 	msghdr = NULL;
1094 	while (msghdr == NULL) {
1095 		if (msgtyp == 0) {
1096 			msghdr = msqkptr->u.msg_first;
1097 			if (msghdr != NULL) {
1098 				if (msgsz < msghdr->msg_ts &&
1099 				    (msgflg & MSG_NOERROR) == 0) {
1100 					DPRINTF(("first message on the queue "
1101 					    "is too big (want %zu, got %d)\n",
1102 					    msgsz, msghdr->msg_ts));
1103 					error = E2BIG;
1104 					goto done2;
1105 				}
1106 #ifdef MAC
1107 				error = mac_sysvmsq_check_msgrcv(td->td_ucred,
1108 				    msghdr);
1109 				if (error != 0)
1110 					goto done2;
1111 #endif
1112 				if (msqkptr->u.msg_first == msqkptr->u.msg_last) {
1113 					msqkptr->u.msg_first = NULL;
1114 					msqkptr->u.msg_last = NULL;
1115 				} else {
1116 					msqkptr->u.msg_first = msghdr->msg_next;
1117 					if (msqkptr->u.msg_first == NULL)
1118 						panic("msg_first/last screwed up #1");
1119 				}
1120 			}
1121 		} else {
1122 			struct msg *previous;
1123 			struct msg **prev;
1124 
1125 			previous = NULL;
1126 			prev = &(msqkptr->u.msg_first);
1127 			while ((msghdr = *prev) != NULL) {
1128 				/*
1129 				 * Is this message's type an exact match or is
1130 				 * this message's type less than or equal to
1131 				 * the absolute value of a negative msgtyp?
1132 				 * Note that the second half of this test can
1133 				 * NEVER be true if msgtyp is positive since
1134 				 * msg_type is always positive!
1135 				 */
1136 
1137 				if (msgtyp == msghdr->msg_type ||
1138 				    msghdr->msg_type <= -msgtyp) {
1139 					DPRINTF(("found message type %ld, "
1140 					    "requested %ld\n",
1141 					    msghdr->msg_type, msgtyp));
1142 					if (msgsz < msghdr->msg_ts &&
1143 					    (msgflg & MSG_NOERROR) == 0) {
1144 						DPRINTF(("requested message "
1145 						    "on the queue is too big "
1146 						    "(want %zu, got %hu)\n",
1147 						    msgsz, msghdr->msg_ts));
1148 						error = E2BIG;
1149 						goto done2;
1150 					}
1151 #ifdef MAC
1152 					error = mac_sysvmsq_check_msgrcv(
1153 					    td->td_ucred, msghdr);
1154 					if (error != 0)
1155 						goto done2;
1156 #endif
1157 					*prev = msghdr->msg_next;
1158 					if (msghdr == msqkptr->u.msg_last) {
1159 						if (previous == NULL) {
1160 							if (prev !=
1161 							    &msqkptr->u.msg_first)
1162 								panic("msg_first/last screwed up #2");
1163 							msqkptr->u.msg_first =
1164 							    NULL;
1165 							msqkptr->u.msg_last =
1166 							    NULL;
1167 						} else {
1168 							if (prev ==
1169 							    &msqkptr->u.msg_first)
1170 								panic("msg_first/last screwed up #3");
1171 							msqkptr->u.msg_last =
1172 							    previous;
1173 						}
1174 					}
1175 					break;
1176 				}
1177 				previous = msghdr;
1178 				prev = &(msghdr->msg_next);
1179 			}
1180 		}
1181 
1182 		/*
1183 		 * We've either extracted the msghdr for the appropriate
1184 		 * message or there isn't one.
1185 		 * If there is one then bail out of this loop.
1186 		 */
1187 
1188 		if (msghdr != NULL)
1189 			break;
1190 
1191 		/*
1192 		 * Hmph!  No message found.  Does the user want to wait?
1193 		 */
1194 
1195 		if ((msgflg & IPC_NOWAIT) != 0) {
1196 			DPRINTF(("no appropriate message found (msgtyp=%ld)\n",
1197 			    msgtyp));
1198 			/* The SVID says to return ENOMSG. */
1199 			error = ENOMSG;
1200 			goto done2;
1201 		}
1202 
1203 		/*
1204 		 * Wait for something to happen
1205 		 */
1206 
1207 		DPRINTF(("msgrcv:  goodnight\n"));
1208 		error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH,
1209 		    "msgrcv", 0);
1210 		DPRINTF(("msgrcv:  good morning (error=%d)\n", error));
1211 
1212 		if (error != 0) {
1213 			DPRINTF(("msgrcv:  interrupted system call\n"));
1214 			error = EINTR;
1215 			goto done2;
1216 		}
1217 
1218 		/*
1219 		 * Make sure that the msq queue still exists
1220 		 */
1221 
1222 		if (msqkptr->u.msg_qbytes == 0 ||
1223 		    msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
1224 			DPRINTF(("msqid deleted\n"));
1225 			error = EIDRM;
1226 			goto done2;
1227 		}
1228 	}
1229 
1230 	/*
1231 	 * Return the message to the user.
1232 	 *
1233 	 * First, do the bookkeeping (before we risk being interrupted).
1234 	 */
1235 
1236 	msqkptr->u.msg_cbytes -= msghdr->msg_ts;
1237 	msqkptr->u.msg_qnum--;
1238 	msqkptr->u.msg_lrpid = td->td_proc->p_pid;
1239 	msqkptr->u.msg_rtime = time_second;
1240 
1241 	racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, 1);
1242 	racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msghdr->msg_ts);
1243 
1244 	/*
1245 	 * Make msgsz the actual amount that we'll be returning.
1246 	 * Note that this effectively truncates the message if it is too long
1247 	 * (since msgsz is never increased).
1248 	 */
1249 
1250 	DPRINTF(("found a message, msgsz=%zu, msg_ts=%hu\n", msgsz,
1251 	    msghdr->msg_ts));
1252 	if (msgsz > msghdr->msg_ts)
1253 		msgsz = msghdr->msg_ts;
1254 	*mtype = msghdr->msg_type;
1255 
1256 	/*
1257 	 * Return the segments to the user
1258 	 */
1259 
1260 	next = msghdr->msg_spot;
1261 	for (len = 0; len < msgsz; len += msginfo.msgssz) {
1262 		size_t tlen;
1263 
1264 		if (msgsz - len > msginfo.msgssz)
1265 			tlen = msginfo.msgssz;
1266 		else
1267 			tlen = msgsz - len;
1268 		if (next <= -1)
1269 			panic("next too low #3");
1270 		if (next >= msginfo.msgseg)
1271 			panic("next out of range #3");
1272 		mtx_unlock(&msq_mtx);
1273 		error = copyout(&msgpool[next * msginfo.msgssz], msgp, tlen);
1274 		mtx_lock(&msq_mtx);
1275 		if (error != 0) {
1276 			DPRINTF(("error (%d) copying out message segment\n",
1277 			    error));
1278 			msg_freehdr(msghdr);
1279 			wakeup(msqkptr);
1280 			goto done2;
1281 		}
1282 		msgp = (char *)msgp + tlen;
1283 		next = msgmaps[next].next;
1284 	}
1285 
1286 	/*
1287 	 * Done, return the actual number of bytes copied out.
1288 	 */
1289 
1290 	msg_freehdr(msghdr);
1291 	wakeup(msqkptr);
1292 	td->td_retval[0] = msgsz;
1293 done2:
1294 	mtx_unlock(&msq_mtx);
1295 	return (error);
1296 }
1297 
1298 int
1299 sys_msgrcv(td, uap)
1300 	struct thread *td;
1301 	register struct msgrcv_args *uap;
1302 {
1303 	int error;
1304 	long mtype;
1305 
1306 	DPRINTF(("call to msgrcv(%d, %p, %zu, %ld, %d)\n", uap->msqid,
1307 	    uap->msgp, uap->msgsz, uap->msgtyp, uap->msgflg));
1308 
1309 	if ((error = kern_msgrcv(td, uap->msqid,
1310 	    (char *)uap->msgp + sizeof(mtype), uap->msgsz,
1311 	    uap->msgtyp, uap->msgflg, &mtype)) != 0)
1312 		return (error);
1313 	if ((error = copyout(&mtype, uap->msgp, sizeof(mtype))) != 0)
1314 		DPRINTF(("error %d copying the message type\n", error));
1315 	return (error);
1316 }
1317 
1318 static int
1319 sysctl_msqids(SYSCTL_HANDLER_ARGS)
1320 {
1321 
1322 	return (SYSCTL_OUT(req, msqids,
1323 	    sizeof(struct msqid_kernel) * msginfo.msgmni));
1324 }
1325 
1326 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmax, CTLFLAG_RD, &msginfo.msgmax, 0,
1327     "Maximum message size");
1328 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmni, CTLFLAG_RDTUN, &msginfo.msgmni, 0,
1329     "Number of message queue identifiers");
1330 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmnb, CTLFLAG_RDTUN, &msginfo.msgmnb, 0,
1331     "Maximum number of bytes in a queue");
1332 SYSCTL_INT(_kern_ipc, OID_AUTO, msgtql, CTLFLAG_RDTUN, &msginfo.msgtql, 0,
1333     "Maximum number of messages in the system");
1334 SYSCTL_INT(_kern_ipc, OID_AUTO, msgssz, CTLFLAG_RDTUN, &msginfo.msgssz, 0,
1335     "Size of a message segment");
1336 SYSCTL_INT(_kern_ipc, OID_AUTO, msgseg, CTLFLAG_RDTUN, &msginfo.msgseg, 0,
1337     "Number of message segments");
1338 SYSCTL_PROC(_kern_ipc, OID_AUTO, msqids, CTLTYPE_OPAQUE | CTLFLAG_RD,
1339     NULL, 0, sysctl_msqids, "", "Message queue IDs");
1340 
1341 #ifdef COMPAT_FREEBSD32
1342 int
1343 freebsd32_msgsys(struct thread *td, struct freebsd32_msgsys_args *uap)
1344 {
1345 
1346 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1347     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1348 	switch (uap->which) {
1349 	case 0:
1350 		return (freebsd7_freebsd32_msgctl(td,
1351 		    (struct freebsd7_freebsd32_msgctl_args *)&uap->a2));
1352 	case 2:
1353 		return (freebsd32_msgsnd(td,
1354 		    (struct freebsd32_msgsnd_args *)&uap->a2));
1355 	case 3:
1356 		return (freebsd32_msgrcv(td,
1357 		    (struct freebsd32_msgrcv_args *)&uap->a2));
1358 	default:
1359 		return (sys_msgsys(td, (struct msgsys_args *)uap));
1360 	}
1361 #else
1362 	return (nosys(td, NULL));
1363 #endif
1364 }
1365 
1366 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1367     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1368 int
1369 freebsd7_freebsd32_msgctl(struct thread *td,
1370     struct freebsd7_freebsd32_msgctl_args *uap)
1371 {
1372 	struct msqid_ds msqbuf;
1373 	struct msqid_ds32_old msqbuf32;
1374 	int error;
1375 
1376 	if (uap->cmd == IPC_SET) {
1377 		error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32));
1378 		if (error)
1379 			return (error);
1380 		freebsd32_ipcperm_old_in(&msqbuf32.msg_perm, &msqbuf.msg_perm);
1381 		PTRIN_CP(msqbuf32, msqbuf, msg_first);
1382 		PTRIN_CP(msqbuf32, msqbuf, msg_last);
1383 		CP(msqbuf32, msqbuf, msg_cbytes);
1384 		CP(msqbuf32, msqbuf, msg_qnum);
1385 		CP(msqbuf32, msqbuf, msg_qbytes);
1386 		CP(msqbuf32, msqbuf, msg_lspid);
1387 		CP(msqbuf32, msqbuf, msg_lrpid);
1388 		CP(msqbuf32, msqbuf, msg_stime);
1389 		CP(msqbuf32, msqbuf, msg_rtime);
1390 		CP(msqbuf32, msqbuf, msg_ctime);
1391 	}
1392 	error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf);
1393 	if (error)
1394 		return (error);
1395 	if (uap->cmd == IPC_STAT) {
1396 		bzero(&msqbuf32, sizeof(msqbuf32));
1397 		freebsd32_ipcperm_old_out(&msqbuf.msg_perm, &msqbuf32.msg_perm);
1398 		PTROUT_CP(msqbuf, msqbuf32, msg_first);
1399 		PTROUT_CP(msqbuf, msqbuf32, msg_last);
1400 		CP(msqbuf, msqbuf32, msg_cbytes);
1401 		CP(msqbuf, msqbuf32, msg_qnum);
1402 		CP(msqbuf, msqbuf32, msg_qbytes);
1403 		CP(msqbuf, msqbuf32, msg_lspid);
1404 		CP(msqbuf, msqbuf32, msg_lrpid);
1405 		CP(msqbuf, msqbuf32, msg_stime);
1406 		CP(msqbuf, msqbuf32, msg_rtime);
1407 		CP(msqbuf, msqbuf32, msg_ctime);
1408 		error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32));
1409 	}
1410 	return (error);
1411 }
1412 #endif
1413 
1414 int
1415 freebsd32_msgctl(struct thread *td, struct freebsd32_msgctl_args *uap)
1416 {
1417 	struct msqid_ds msqbuf;
1418 	struct msqid_ds32 msqbuf32;
1419 	int error;
1420 
1421 	if (uap->cmd == IPC_SET) {
1422 		error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32));
1423 		if (error)
1424 			return (error);
1425 		freebsd32_ipcperm_in(&msqbuf32.msg_perm, &msqbuf.msg_perm);
1426 		PTRIN_CP(msqbuf32, msqbuf, msg_first);
1427 		PTRIN_CP(msqbuf32, msqbuf, msg_last);
1428 		CP(msqbuf32, msqbuf, msg_cbytes);
1429 		CP(msqbuf32, msqbuf, msg_qnum);
1430 		CP(msqbuf32, msqbuf, msg_qbytes);
1431 		CP(msqbuf32, msqbuf, msg_lspid);
1432 		CP(msqbuf32, msqbuf, msg_lrpid);
1433 		CP(msqbuf32, msqbuf, msg_stime);
1434 		CP(msqbuf32, msqbuf, msg_rtime);
1435 		CP(msqbuf32, msqbuf, msg_ctime);
1436 	}
1437 	error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf);
1438 	if (error)
1439 		return (error);
1440 	if (uap->cmd == IPC_STAT) {
1441 		freebsd32_ipcperm_out(&msqbuf.msg_perm, &msqbuf32.msg_perm);
1442 		PTROUT_CP(msqbuf, msqbuf32, msg_first);
1443 		PTROUT_CP(msqbuf, msqbuf32, msg_last);
1444 		CP(msqbuf, msqbuf32, msg_cbytes);
1445 		CP(msqbuf, msqbuf32, msg_qnum);
1446 		CP(msqbuf, msqbuf32, msg_qbytes);
1447 		CP(msqbuf, msqbuf32, msg_lspid);
1448 		CP(msqbuf, msqbuf32, msg_lrpid);
1449 		CP(msqbuf, msqbuf32, msg_stime);
1450 		CP(msqbuf, msqbuf32, msg_rtime);
1451 		CP(msqbuf, msqbuf32, msg_ctime);
1452 		error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32));
1453 	}
1454 	return (error);
1455 }
1456 
1457 int
1458 freebsd32_msgsnd(struct thread *td, struct freebsd32_msgsnd_args *uap)
1459 {
1460 	const void *msgp;
1461 	long mtype;
1462 	int32_t mtype32;
1463 	int error;
1464 
1465 	msgp = PTRIN(uap->msgp);
1466 	if ((error = copyin(msgp, &mtype32, sizeof(mtype32))) != 0)
1467 		return (error);
1468 	mtype = mtype32;
1469 	return (kern_msgsnd(td, uap->msqid,
1470 	    (const char *)msgp + sizeof(mtype32),
1471 	    uap->msgsz, uap->msgflg, mtype));
1472 }
1473 
1474 int
1475 freebsd32_msgrcv(struct thread *td, struct freebsd32_msgrcv_args *uap)
1476 {
1477 	void *msgp;
1478 	long mtype;
1479 	int32_t mtype32;
1480 	int error;
1481 
1482 	msgp = PTRIN(uap->msgp);
1483 	if ((error = kern_msgrcv(td, uap->msqid,
1484 	    (char *)msgp + sizeof(mtype32), uap->msgsz,
1485 	    uap->msgtyp, uap->msgflg, &mtype)) != 0)
1486 		return (error);
1487 	mtype32 = (int32_t)mtype;
1488 	return (copyout(&mtype32, msgp, sizeof(mtype32)));
1489 }
1490 #endif
1491 
1492 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1493     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1494 
1495 /* XXX casting to (sy_call_t *) is bogus, as usual. */
1496 static sy_call_t *msgcalls[] = {
1497 	(sy_call_t *)freebsd7_msgctl, (sy_call_t *)sys_msgget,
1498 	(sy_call_t *)sys_msgsnd, (sy_call_t *)sys_msgrcv
1499 };
1500 
1501 /*
1502  * Entry point for all MSG calls.
1503  */
1504 int
1505 sys_msgsys(td, uap)
1506 	struct thread *td;
1507 	/* XXX actually varargs. */
1508 	struct msgsys_args /* {
1509 		int	which;
1510 		int	a2;
1511 		int	a3;
1512 		int	a4;
1513 		int	a5;
1514 		int	a6;
1515 	} */ *uap;
1516 {
1517 	int error;
1518 
1519 	if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
1520 		return (ENOSYS);
1521 	if (uap->which < 0 ||
1522 	    uap->which >= sizeof(msgcalls)/sizeof(msgcalls[0]))
1523 		return (EINVAL);
1524 	error = (*msgcalls[uap->which])(td, &uap->a2);
1525 	return (error);
1526 }
1527 
1528 #ifndef CP
1529 #define CP(src, dst, fld)	do { (dst).fld = (src).fld; } while (0)
1530 #endif
1531 
1532 #ifndef _SYS_SYSPROTO_H_
1533 struct freebsd7_msgctl_args {
1534 	int	msqid;
1535 	int	cmd;
1536 	struct	msqid_ds_old *buf;
1537 };
1538 #endif
1539 int
1540 freebsd7_msgctl(td, uap)
1541 	struct thread *td;
1542 	struct freebsd7_msgctl_args *uap;
1543 {
1544 	struct msqid_ds_old msqold;
1545 	struct msqid_ds msqbuf;
1546 	int error;
1547 
1548 	DPRINTF(("call to freebsd7_msgctl(%d, %d, %p)\n", uap->msqid, uap->cmd,
1549 	    uap->buf));
1550 	if (uap->cmd == IPC_SET) {
1551 		error = copyin(uap->buf, &msqold, sizeof(msqold));
1552 		if (error)
1553 			return (error);
1554 		ipcperm_old2new(&msqold.msg_perm, &msqbuf.msg_perm);
1555 		CP(msqold, msqbuf, msg_first);
1556 		CP(msqold, msqbuf, msg_last);
1557 		CP(msqold, msqbuf, msg_cbytes);
1558 		CP(msqold, msqbuf, msg_qnum);
1559 		CP(msqold, msqbuf, msg_qbytes);
1560 		CP(msqold, msqbuf, msg_lspid);
1561 		CP(msqold, msqbuf, msg_lrpid);
1562 		CP(msqold, msqbuf, msg_stime);
1563 		CP(msqold, msqbuf, msg_rtime);
1564 		CP(msqold, msqbuf, msg_ctime);
1565 	}
1566 	error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf);
1567 	if (error)
1568 		return (error);
1569 	if (uap->cmd == IPC_STAT) {
1570 		bzero(&msqold, sizeof(msqold));
1571 		ipcperm_new2old(&msqbuf.msg_perm, &msqold.msg_perm);
1572 		CP(msqbuf, msqold, msg_first);
1573 		CP(msqbuf, msqold, msg_last);
1574 		CP(msqbuf, msqold, msg_cbytes);
1575 		CP(msqbuf, msqold, msg_qnum);
1576 		CP(msqbuf, msqold, msg_qbytes);
1577 		CP(msqbuf, msqold, msg_lspid);
1578 		CP(msqbuf, msqold, msg_lrpid);
1579 		CP(msqbuf, msqold, msg_stime);
1580 		CP(msqbuf, msqold, msg_rtime);
1581 		CP(msqbuf, msqold, msg_ctime);
1582 		error = copyout(&msqold, uap->buf, sizeof(struct msqid_ds_old));
1583 	}
1584 	return (error);
1585 }
1586 
1587 #undef CP
1588 
1589 #endif	/* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 ||
1590 	   COMPAT_FREEBSD7 */
1591