FreeBSD/Linux Kernel Cross Reference
sys/kern/sysv_msg.c
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: releng/10.3/sys/kern/sysv_msg.c 284665 2015-06-21 06:28:26Z trasz $");
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 TUNABLE_INT_FETCH("kern.ipc.msgseg", &msginfo.msgseg);
200 TUNABLE_INT_FETCH("kern.ipc.msgssz", &msginfo.msgssz);
201 msginfo.msgmax = msginfo.msgseg * msginfo.msgssz;
202 TUNABLE_INT_FETCH("kern.ipc.msgmni", &msginfo.msgmni);
203 TUNABLE_INT_FETCH("kern.ipc.msgmnb", &msginfo.msgmnb);
204 TUNABLE_INT_FETCH("kern.ipc.msgtql", &msginfo.msgtql);
205
206 msgpool = malloc(msginfo.msgmax, M_MSG, M_WAITOK);
207 msgmaps = malloc(sizeof(struct msgmap) * msginfo.msgseg, M_MSG, M_WAITOK);
208 msghdrs = malloc(sizeof(struct msg) * msginfo.msgtql, M_MSG, M_WAITOK);
209 msqids = malloc(sizeof(struct msqid_kernel) * msginfo.msgmni, M_MSG,
210 M_WAITOK);
211
212 /*
213 * msginfo.msgssz should be a power of two for efficiency reasons.
214 * It is also pretty silly if msginfo.msgssz is less than 8
215 * or greater than about 256 so ...
216 */
217
218 i = 8;
219 while (i < 1024 && i != msginfo.msgssz)
220 i <<= 1;
221 if (i != msginfo.msgssz) {
222 DPRINTF(("msginfo.msgssz=%d (0x%x)\n", msginfo.msgssz,
223 msginfo.msgssz));
224 panic("msginfo.msgssz not a small power of 2");
225 }
226
227 if (msginfo.msgseg > 32767) {
228 DPRINTF(("msginfo.msgseg=%d\n", msginfo.msgseg));
229 panic("msginfo.msgseg > 32767");
230 }
231
232 for (i = 0; i < msginfo.msgseg; i++) {
233 if (i > 0)
234 msgmaps[i-1].next = i;
235 msgmaps[i].next = -1; /* implies entry is available */
236 }
237 free_msgmaps = 0;
238 nfree_msgmaps = msginfo.msgseg;
239
240 for (i = 0; i < msginfo.msgtql; i++) {
241 msghdrs[i].msg_type = 0;
242 if (i > 0)
243 msghdrs[i-1].msg_next = &msghdrs[i];
244 msghdrs[i].msg_next = NULL;
245 #ifdef MAC
246 mac_sysvmsg_init(&msghdrs[i]);
247 #endif
248 }
249 free_msghdrs = &msghdrs[0];
250
251 for (i = 0; i < msginfo.msgmni; i++) {
252 msqids[i].u.msg_qbytes = 0; /* implies entry is available */
253 msqids[i].u.msg_perm.seq = 0; /* reset to a known value */
254 msqids[i].u.msg_perm.mode = 0;
255 #ifdef MAC
256 mac_sysvmsq_init(&msqids[i]);
257 #endif
258 }
259 mtx_init(&msq_mtx, "msq", NULL, MTX_DEF);
260
261 error = syscall_helper_register(msg_syscalls);
262 if (error != 0)
263 return (error);
264 #ifdef COMPAT_FREEBSD32
265 error = syscall32_helper_register(msg32_syscalls);
266 if (error != 0)
267 return (error);
268 #endif
269 return (0);
270 }
271
272 static int
273 msgunload()
274 {
275 struct msqid_kernel *msqkptr;
276 int msqid;
277 #ifdef MAC
278 int i;
279 #endif
280
281 syscall_helper_unregister(msg_syscalls);
282 #ifdef COMPAT_FREEBSD32
283 syscall32_helper_unregister(msg32_syscalls);
284 #endif
285
286 for (msqid = 0; msqid < msginfo.msgmni; msqid++) {
287 /*
288 * Look for an unallocated and unlocked msqid_ds.
289 * msqid_ds's can be locked by msgsnd or msgrcv while
290 * they are copying the message in/out. We can't
291 * re-use the entry until they release it.
292 */
293 msqkptr = &msqids[msqid];
294 if (msqkptr->u.msg_qbytes != 0 ||
295 (msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0)
296 break;
297 }
298 if (msqid != msginfo.msgmni)
299 return (EBUSY);
300
301 #ifdef MAC
302 for (i = 0; i < msginfo.msgtql; i++)
303 mac_sysvmsg_destroy(&msghdrs[i]);
304 for (msqid = 0; msqid < msginfo.msgmni; msqid++)
305 mac_sysvmsq_destroy(&msqids[msqid]);
306 #endif
307 free(msgpool, M_MSG);
308 free(msgmaps, M_MSG);
309 free(msghdrs, M_MSG);
310 free(msqids, M_MSG);
311 mtx_destroy(&msq_mtx);
312 return (0);
313 }
314
315
316 static int
317 sysvmsg_modload(struct module *module, int cmd, void *arg)
318 {
319 int error = 0;
320
321 switch (cmd) {
322 case MOD_LOAD:
323 error = msginit();
324 if (error != 0)
325 msgunload();
326 break;
327 case MOD_UNLOAD:
328 error = msgunload();
329 break;
330 case MOD_SHUTDOWN:
331 break;
332 default:
333 error = EINVAL;
334 break;
335 }
336 return (error);
337 }
338
339 static moduledata_t sysvmsg_mod = {
340 "sysvmsg",
341 &sysvmsg_modload,
342 NULL
343 };
344
345 DECLARE_MODULE(sysvmsg, sysvmsg_mod, SI_SUB_SYSV_MSG, SI_ORDER_FIRST);
346 MODULE_VERSION(sysvmsg, 1);
347
348 static void
349 msg_freehdr(msghdr)
350 struct msg *msghdr;
351 {
352 while (msghdr->msg_ts > 0) {
353 short next;
354 if (msghdr->msg_spot < 0 || msghdr->msg_spot >= msginfo.msgseg)
355 panic("msghdr->msg_spot out of range");
356 next = msgmaps[msghdr->msg_spot].next;
357 msgmaps[msghdr->msg_spot].next = free_msgmaps;
358 free_msgmaps = msghdr->msg_spot;
359 nfree_msgmaps++;
360 msghdr->msg_spot = next;
361 if (msghdr->msg_ts >= msginfo.msgssz)
362 msghdr->msg_ts -= msginfo.msgssz;
363 else
364 msghdr->msg_ts = 0;
365 }
366 if (msghdr->msg_spot != -1)
367 panic("msghdr->msg_spot != -1");
368 msghdr->msg_next = free_msghdrs;
369 free_msghdrs = msghdr;
370 #ifdef MAC
371 mac_sysvmsg_cleanup(msghdr);
372 #endif
373 }
374
375 #ifndef _SYS_SYSPROTO_H_
376 struct msgctl_args {
377 int msqid;
378 int cmd;
379 struct msqid_ds *buf;
380 };
381 #endif
382 int
383 sys_msgctl(td, uap)
384 struct thread *td;
385 register struct msgctl_args *uap;
386 {
387 int msqid = uap->msqid;
388 int cmd = uap->cmd;
389 struct msqid_ds msqbuf;
390 int error;
391
392 DPRINTF(("call to msgctl(%d, %d, %p)\n", msqid, cmd, uap->buf));
393 if (cmd == IPC_SET &&
394 (error = copyin(uap->buf, &msqbuf, sizeof(msqbuf))) != 0)
395 return (error);
396 error = kern_msgctl(td, msqid, cmd, &msqbuf);
397 if (cmd == IPC_STAT && error == 0)
398 error = copyout(&msqbuf, uap->buf, sizeof(struct msqid_ds));
399 return (error);
400 }
401
402 int
403 kern_msgctl(td, msqid, cmd, msqbuf)
404 struct thread *td;
405 int msqid;
406 int cmd;
407 struct msqid_ds *msqbuf;
408 {
409 int rval, error, msqix;
410 register struct msqid_kernel *msqkptr;
411
412 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
413 return (ENOSYS);
414
415 msqix = IPCID_TO_IX(msqid);
416
417 if (msqix < 0 || msqix >= msginfo.msgmni) {
418 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix,
419 msginfo.msgmni));
420 return (EINVAL);
421 }
422
423 msqkptr = &msqids[msqix];
424
425 mtx_lock(&msq_mtx);
426 if (msqkptr->u.msg_qbytes == 0) {
427 DPRINTF(("no such msqid\n"));
428 error = EINVAL;
429 goto done2;
430 }
431 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
432 DPRINTF(("wrong sequence number\n"));
433 error = EINVAL;
434 goto done2;
435 }
436 #ifdef MAC
437 error = mac_sysvmsq_check_msqctl(td->td_ucred, msqkptr, cmd);
438 if (error != 0)
439 goto done2;
440 #endif
441
442 error = 0;
443 rval = 0;
444
445 switch (cmd) {
446
447 case IPC_RMID:
448 {
449 struct msg *msghdr;
450 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M)))
451 goto done2;
452
453 #ifdef MAC
454 /*
455 * Check that the thread has MAC access permissions to
456 * individual msghdrs. Note: We need to do this in a
457 * separate loop because the actual loop alters the
458 * msq/msghdr info as it progresses, and there is no going
459 * back if half the way through we discover that the
460 * thread cannot free a certain msghdr. The msq will get
461 * into an inconsistent state.
462 */
463 for (msghdr = msqkptr->u.msg_first; msghdr != NULL;
464 msghdr = msghdr->msg_next) {
465 error = mac_sysvmsq_check_msgrmid(td->td_ucred, msghdr);
466 if (error != 0)
467 goto done2;
468 }
469 #endif
470
471 racct_sub_cred(msqkptr->cred, RACCT_NMSGQ, 1);
472 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, msqkptr->u.msg_qnum);
473 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msqkptr->u.msg_cbytes);
474 crfree(msqkptr->cred);
475 msqkptr->cred = NULL;
476
477 /* Free the message headers */
478 msghdr = msqkptr->u.msg_first;
479 while (msghdr != NULL) {
480 struct msg *msghdr_tmp;
481
482 /* Free the segments of each message */
483 msqkptr->u.msg_cbytes -= msghdr->msg_ts;
484 msqkptr->u.msg_qnum--;
485 msghdr_tmp = msghdr;
486 msghdr = msghdr->msg_next;
487 msg_freehdr(msghdr_tmp);
488 }
489
490 if (msqkptr->u.msg_cbytes != 0)
491 panic("msg_cbytes is screwed up");
492 if (msqkptr->u.msg_qnum != 0)
493 panic("msg_qnum is screwed up");
494
495 msqkptr->u.msg_qbytes = 0; /* Mark it as free */
496
497 #ifdef MAC
498 mac_sysvmsq_cleanup(msqkptr);
499 #endif
500
501 wakeup(msqkptr);
502 }
503
504 break;
505
506 case IPC_SET:
507 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M)))
508 goto done2;
509 if (msqbuf->msg_qbytes > msqkptr->u.msg_qbytes) {
510 error = priv_check(td, PRIV_IPC_MSGSIZE);
511 if (error)
512 goto done2;
513 }
514 if (msqbuf->msg_qbytes > msginfo.msgmnb) {
515 DPRINTF(("can't increase msg_qbytes beyond %d"
516 "(truncating)\n", msginfo.msgmnb));
517 msqbuf->msg_qbytes = msginfo.msgmnb; /* silently restrict qbytes to system limit */
518 }
519 if (msqbuf->msg_qbytes == 0) {
520 DPRINTF(("can't reduce msg_qbytes to 0\n"));
521 error = EINVAL; /* non-standard errno! */
522 goto done2;
523 }
524 msqkptr->u.msg_perm.uid = msqbuf->msg_perm.uid; /* change the owner */
525 msqkptr->u.msg_perm.gid = msqbuf->msg_perm.gid; /* change the owner */
526 msqkptr->u.msg_perm.mode = (msqkptr->u.msg_perm.mode & ~0777) |
527 (msqbuf->msg_perm.mode & 0777);
528 msqkptr->u.msg_qbytes = msqbuf->msg_qbytes;
529 msqkptr->u.msg_ctime = time_second;
530 break;
531
532 case IPC_STAT:
533 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) {
534 DPRINTF(("requester doesn't have read access\n"));
535 goto done2;
536 }
537 *msqbuf = msqkptr->u;
538 break;
539
540 default:
541 DPRINTF(("invalid command %d\n", cmd));
542 error = EINVAL;
543 goto done2;
544 }
545
546 if (error == 0)
547 td->td_retval[0] = rval;
548 done2:
549 mtx_unlock(&msq_mtx);
550 return (error);
551 }
552
553 #ifndef _SYS_SYSPROTO_H_
554 struct msgget_args {
555 key_t key;
556 int msgflg;
557 };
558 #endif
559
560 int
561 sys_msgget(td, uap)
562 struct thread *td;
563 register struct msgget_args *uap;
564 {
565 int msqid, error = 0;
566 int key = uap->key;
567 int msgflg = uap->msgflg;
568 struct ucred *cred = td->td_ucred;
569 register struct msqid_kernel *msqkptr = NULL;
570
571 DPRINTF(("msgget(0x%x, 0%o)\n", key, msgflg));
572
573 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
574 return (ENOSYS);
575
576 mtx_lock(&msq_mtx);
577 if (key != IPC_PRIVATE) {
578 for (msqid = 0; msqid < msginfo.msgmni; msqid++) {
579 msqkptr = &msqids[msqid];
580 if (msqkptr->u.msg_qbytes != 0 &&
581 msqkptr->u.msg_perm.key == key)
582 break;
583 }
584 if (msqid < msginfo.msgmni) {
585 DPRINTF(("found public key\n"));
586 if ((msgflg & IPC_CREAT) && (msgflg & IPC_EXCL)) {
587 DPRINTF(("not exclusive\n"));
588 error = EEXIST;
589 goto done2;
590 }
591 if ((error = ipcperm(td, &msqkptr->u.msg_perm,
592 msgflg & 0700))) {
593 DPRINTF(("requester doesn't have 0%o access\n",
594 msgflg & 0700));
595 goto done2;
596 }
597 #ifdef MAC
598 error = mac_sysvmsq_check_msqget(cred, msqkptr);
599 if (error != 0)
600 goto done2;
601 #endif
602 goto found;
603 }
604 }
605
606 DPRINTF(("need to allocate the msqid_ds\n"));
607 if (key == IPC_PRIVATE || (msgflg & IPC_CREAT)) {
608 for (msqid = 0; msqid < msginfo.msgmni; msqid++) {
609 /*
610 * Look for an unallocated and unlocked msqid_ds.
611 * msqid_ds's can be locked by msgsnd or msgrcv while
612 * they are copying the message in/out. We can't
613 * re-use the entry until they release it.
614 */
615 msqkptr = &msqids[msqid];
616 if (msqkptr->u.msg_qbytes == 0 &&
617 (msqkptr->u.msg_perm.mode & MSG_LOCKED) == 0)
618 break;
619 }
620 if (msqid == msginfo.msgmni) {
621 DPRINTF(("no more msqid_ds's available\n"));
622 error = ENOSPC;
623 goto done2;
624 }
625 #ifdef RACCT
626 if (racct_enable) {
627 PROC_LOCK(td->td_proc);
628 error = racct_add(td->td_proc, RACCT_NMSGQ, 1);
629 PROC_UNLOCK(td->td_proc);
630 if (error != 0) {
631 error = ENOSPC;
632 goto done2;
633 }
634 }
635 #endif
636 DPRINTF(("msqid %d is available\n", msqid));
637 msqkptr->u.msg_perm.key = key;
638 msqkptr->u.msg_perm.cuid = cred->cr_uid;
639 msqkptr->u.msg_perm.uid = cred->cr_uid;
640 msqkptr->u.msg_perm.cgid = cred->cr_gid;
641 msqkptr->u.msg_perm.gid = cred->cr_gid;
642 msqkptr->u.msg_perm.mode = (msgflg & 0777);
643 msqkptr->cred = crhold(cred);
644 /* Make sure that the returned msqid is unique */
645 msqkptr->u.msg_perm.seq = (msqkptr->u.msg_perm.seq + 1) & 0x7fff;
646 msqkptr->u.msg_first = NULL;
647 msqkptr->u.msg_last = NULL;
648 msqkptr->u.msg_cbytes = 0;
649 msqkptr->u.msg_qnum = 0;
650 msqkptr->u.msg_qbytes = msginfo.msgmnb;
651 msqkptr->u.msg_lspid = 0;
652 msqkptr->u.msg_lrpid = 0;
653 msqkptr->u.msg_stime = 0;
654 msqkptr->u.msg_rtime = 0;
655 msqkptr->u.msg_ctime = time_second;
656 #ifdef MAC
657 mac_sysvmsq_create(cred, msqkptr);
658 #endif
659 } else {
660 DPRINTF(("didn't find it and wasn't asked to create it\n"));
661 error = ENOENT;
662 goto done2;
663 }
664
665 found:
666 /* Construct the unique msqid */
667 td->td_retval[0] = IXSEQ_TO_IPCID(msqid, msqkptr->u.msg_perm);
668 done2:
669 mtx_unlock(&msq_mtx);
670 return (error);
671 }
672
673 #ifndef _SYS_SYSPROTO_H_
674 struct msgsnd_args {
675 int msqid;
676 const void *msgp;
677 size_t msgsz;
678 int msgflg;
679 };
680 #endif
681 int
682 kern_msgsnd(td, msqid, msgp, msgsz, msgflg, mtype)
683 struct thread *td;
684 int msqid;
685 const void *msgp; /* XXX msgp is actually mtext. */
686 size_t msgsz;
687 int msgflg;
688 long mtype;
689 {
690 int msqix, segs_needed, error = 0;
691 register struct msqid_kernel *msqkptr;
692 register struct msg *msghdr;
693 short next;
694 #ifdef RACCT
695 size_t saved_msgsz;
696 #endif
697
698 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
699 return (ENOSYS);
700
701 mtx_lock(&msq_mtx);
702 msqix = IPCID_TO_IX(msqid);
703
704 if (msqix < 0 || msqix >= msginfo.msgmni) {
705 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix,
706 msginfo.msgmni));
707 error = EINVAL;
708 goto done2;
709 }
710
711 msqkptr = &msqids[msqix];
712 if (msqkptr->u.msg_qbytes == 0) {
713 DPRINTF(("no such message queue id\n"));
714 error = EINVAL;
715 goto done2;
716 }
717 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
718 DPRINTF(("wrong sequence number\n"));
719 error = EINVAL;
720 goto done2;
721 }
722
723 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_W))) {
724 DPRINTF(("requester doesn't have write access\n"));
725 goto done2;
726 }
727
728 #ifdef MAC
729 error = mac_sysvmsq_check_msqsnd(td->td_ucred, msqkptr);
730 if (error != 0)
731 goto done2;
732 #endif
733
734 #ifdef RACCT
735 if (racct_enable) {
736 PROC_LOCK(td->td_proc);
737 if (racct_add(td->td_proc, RACCT_MSGQQUEUED, 1)) {
738 PROC_UNLOCK(td->td_proc);
739 error = EAGAIN;
740 goto done2;
741 }
742 saved_msgsz = msgsz;
743 if (racct_add(td->td_proc, RACCT_MSGQSIZE, msgsz)) {
744 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1);
745 PROC_UNLOCK(td->td_proc);
746 error = EAGAIN;
747 goto done2;
748 }
749 PROC_UNLOCK(td->td_proc);
750 }
751 #endif
752
753 segs_needed = (msgsz + msginfo.msgssz - 1) / msginfo.msgssz;
754 DPRINTF(("msgsz=%zu, msgssz=%d, segs_needed=%d\n", msgsz,
755 msginfo.msgssz, segs_needed));
756 for (;;) {
757 int need_more_resources = 0;
758
759 /*
760 * check msgsz
761 * (inside this loop in case msg_qbytes changes while we sleep)
762 */
763
764 if (msgsz > msqkptr->u.msg_qbytes) {
765 DPRINTF(("msgsz > msqkptr->u.msg_qbytes\n"));
766 error = EINVAL;
767 goto done3;
768 }
769
770 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) {
771 DPRINTF(("msqid is locked\n"));
772 need_more_resources = 1;
773 }
774 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) {
775 DPRINTF(("msgsz + msg_cbytes > msg_qbytes\n"));
776 need_more_resources = 1;
777 }
778 if (segs_needed > nfree_msgmaps) {
779 DPRINTF(("segs_needed > nfree_msgmaps\n"));
780 need_more_resources = 1;
781 }
782 if (free_msghdrs == NULL) {
783 DPRINTF(("no more msghdrs\n"));
784 need_more_resources = 1;
785 }
786
787 if (need_more_resources) {
788 int we_own_it;
789
790 if ((msgflg & IPC_NOWAIT) != 0) {
791 DPRINTF(("need more resources but caller "
792 "doesn't want to wait\n"));
793 error = EAGAIN;
794 goto done3;
795 }
796
797 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) {
798 DPRINTF(("we don't own the msqid_ds\n"));
799 we_own_it = 0;
800 } else {
801 /* Force later arrivals to wait for our
802 request */
803 DPRINTF(("we own the msqid_ds\n"));
804 msqkptr->u.msg_perm.mode |= MSG_LOCKED;
805 we_own_it = 1;
806 }
807 DPRINTF(("msgsnd: goodnight\n"));
808 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH,
809 "msgsnd", hz);
810 DPRINTF(("msgsnd: good morning, error=%d\n", error));
811 if (we_own_it)
812 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
813 if (error == EWOULDBLOCK) {
814 DPRINTF(("msgsnd: timed out\n"));
815 continue;
816 }
817 if (error != 0) {
818 DPRINTF(("msgsnd: interrupted system call\n"));
819 error = EINTR;
820 goto done3;
821 }
822
823 /*
824 * Make sure that the msq queue still exists
825 */
826
827 if (msqkptr->u.msg_qbytes == 0) {
828 DPRINTF(("msqid deleted\n"));
829 error = EIDRM;
830 goto done3;
831 }
832
833 } else {
834 DPRINTF(("got all the resources that we need\n"));
835 break;
836 }
837 }
838
839 /*
840 * We have the resources that we need.
841 * Make sure!
842 */
843
844 if (msqkptr->u.msg_perm.mode & MSG_LOCKED)
845 panic("msg_perm.mode & MSG_LOCKED");
846 if (segs_needed > nfree_msgmaps)
847 panic("segs_needed > nfree_msgmaps");
848 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes)
849 panic("msgsz + msg_cbytes > msg_qbytes");
850 if (free_msghdrs == NULL)
851 panic("no more msghdrs");
852
853 /*
854 * Re-lock the msqid_ds in case we page-fault when copying in the
855 * message
856 */
857
858 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0)
859 panic("msqid_ds is already locked");
860 msqkptr->u.msg_perm.mode |= MSG_LOCKED;
861
862 /*
863 * Allocate a message header
864 */
865
866 msghdr = free_msghdrs;
867 free_msghdrs = msghdr->msg_next;
868 msghdr->msg_spot = -1;
869 msghdr->msg_ts = msgsz;
870 msghdr->msg_type = mtype;
871 #ifdef MAC
872 /*
873 * XXXMAC: Should the mac_sysvmsq_check_msgmsq check follow here
874 * immediately? Or, should it be checked just before the msg is
875 * enqueued in the msgq (as it is done now)?
876 */
877 mac_sysvmsg_create(td->td_ucred, msqkptr, msghdr);
878 #endif
879
880 /*
881 * Allocate space for the message
882 */
883
884 while (segs_needed > 0) {
885 if (nfree_msgmaps <= 0)
886 panic("not enough msgmaps");
887 if (free_msgmaps == -1)
888 panic("nil free_msgmaps");
889 next = free_msgmaps;
890 if (next <= -1)
891 panic("next too low #1");
892 if (next >= msginfo.msgseg)
893 panic("next out of range #1");
894 DPRINTF(("allocating segment %d to message\n", next));
895 free_msgmaps = msgmaps[next].next;
896 nfree_msgmaps--;
897 msgmaps[next].next = msghdr->msg_spot;
898 msghdr->msg_spot = next;
899 segs_needed--;
900 }
901
902 /*
903 * Validate the message type
904 */
905
906 if (msghdr->msg_type < 1) {
907 msg_freehdr(msghdr);
908 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
909 wakeup(msqkptr);
910 DPRINTF(("mtype (%ld) < 1\n", msghdr->msg_type));
911 error = EINVAL;
912 goto done3;
913 }
914
915 /*
916 * Copy in the message body
917 */
918
919 next = msghdr->msg_spot;
920 while (msgsz > 0) {
921 size_t tlen;
922 if (msgsz > msginfo.msgssz)
923 tlen = msginfo.msgssz;
924 else
925 tlen = msgsz;
926 if (next <= -1)
927 panic("next too low #2");
928 if (next >= msginfo.msgseg)
929 panic("next out of range #2");
930 mtx_unlock(&msq_mtx);
931 if ((error = copyin(msgp, &msgpool[next * msginfo.msgssz],
932 tlen)) != 0) {
933 mtx_lock(&msq_mtx);
934 DPRINTF(("error %d copying in message segment\n",
935 error));
936 msg_freehdr(msghdr);
937 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
938 wakeup(msqkptr);
939 goto done3;
940 }
941 mtx_lock(&msq_mtx);
942 msgsz -= tlen;
943 msgp = (const char *)msgp + tlen;
944 next = msgmaps[next].next;
945 }
946 if (next != -1)
947 panic("didn't use all the msg segments");
948
949 /*
950 * We've got the message. Unlock the msqid_ds.
951 */
952
953 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED;
954
955 /*
956 * Make sure that the msqid_ds is still allocated.
957 */
958
959 if (msqkptr->u.msg_qbytes == 0) {
960 msg_freehdr(msghdr);
961 wakeup(msqkptr);
962 error = EIDRM;
963 goto done3;
964 }
965
966 #ifdef MAC
967 /*
968 * Note: Since the task/thread allocates the msghdr and usually
969 * primes it with its own MAC label, for a majority of policies, it
970 * won't be necessary to check whether the msghdr has access
971 * permissions to the msgq. The mac_sysvmsq_check_msqsnd check would
972 * suffice in that case. However, this hook may be required where
973 * individual policies derive a non-identical label for the msghdr
974 * from the current thread label and may want to check the msghdr
975 * enqueue permissions, along with read/write permissions to the
976 * msgq.
977 */
978 error = mac_sysvmsq_check_msgmsq(td->td_ucred, msghdr, msqkptr);
979 if (error != 0) {
980 msg_freehdr(msghdr);
981 wakeup(msqkptr);
982 goto done3;
983 }
984 #endif
985
986 /*
987 * Put the message into the queue
988 */
989 if (msqkptr->u.msg_first == NULL) {
990 msqkptr->u.msg_first = msghdr;
991 msqkptr->u.msg_last = msghdr;
992 } else {
993 msqkptr->u.msg_last->msg_next = msghdr;
994 msqkptr->u.msg_last = msghdr;
995 }
996 msqkptr->u.msg_last->msg_next = NULL;
997
998 msqkptr->u.msg_cbytes += msghdr->msg_ts;
999 msqkptr->u.msg_qnum++;
1000 msqkptr->u.msg_lspid = td->td_proc->p_pid;
1001 msqkptr->u.msg_stime = time_second;
1002
1003 wakeup(msqkptr);
1004 td->td_retval[0] = 0;
1005 done3:
1006 #ifdef RACCT
1007 if (racct_enable && error != 0) {
1008 PROC_LOCK(td->td_proc);
1009 racct_sub(td->td_proc, RACCT_MSGQQUEUED, 1);
1010 racct_sub(td->td_proc, RACCT_MSGQSIZE, saved_msgsz);
1011 PROC_UNLOCK(td->td_proc);
1012 }
1013 #endif
1014 done2:
1015 mtx_unlock(&msq_mtx);
1016 return (error);
1017 }
1018
1019 int
1020 sys_msgsnd(td, uap)
1021 struct thread *td;
1022 register struct msgsnd_args *uap;
1023 {
1024 int error;
1025 long mtype;
1026
1027 DPRINTF(("call to msgsnd(%d, %p, %zu, %d)\n", uap->msqid, uap->msgp,
1028 uap->msgsz, uap->msgflg));
1029
1030 if ((error = copyin(uap->msgp, &mtype, sizeof(mtype))) != 0) {
1031 DPRINTF(("error %d copying the message type\n", error));
1032 return (error);
1033 }
1034 return (kern_msgsnd(td, uap->msqid,
1035 (const char *)uap->msgp + sizeof(mtype),
1036 uap->msgsz, uap->msgflg, mtype));
1037 }
1038
1039 #ifndef _SYS_SYSPROTO_H_
1040 struct msgrcv_args {
1041 int msqid;
1042 void *msgp;
1043 size_t msgsz;
1044 long msgtyp;
1045 int msgflg;
1046 };
1047 #endif
1048 int
1049 kern_msgrcv(td, msqid, msgp, msgsz, msgtyp, msgflg, mtype)
1050 struct thread *td;
1051 int msqid;
1052 void *msgp; /* XXX msgp is actually mtext. */
1053 size_t msgsz;
1054 long msgtyp;
1055 int msgflg;
1056 long *mtype;
1057 {
1058 size_t len;
1059 register struct msqid_kernel *msqkptr;
1060 register struct msg *msghdr;
1061 int msqix, error = 0;
1062 short next;
1063
1064 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
1065 return (ENOSYS);
1066
1067 msqix = IPCID_TO_IX(msqid);
1068
1069 if (msqix < 0 || msqix >= msginfo.msgmni) {
1070 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix,
1071 msginfo.msgmni));
1072 return (EINVAL);
1073 }
1074
1075 msqkptr = &msqids[msqix];
1076 mtx_lock(&msq_mtx);
1077 if (msqkptr->u.msg_qbytes == 0) {
1078 DPRINTF(("no such message queue id\n"));
1079 error = EINVAL;
1080 goto done2;
1081 }
1082 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
1083 DPRINTF(("wrong sequence number\n"));
1084 error = EINVAL;
1085 goto done2;
1086 }
1087
1088 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) {
1089 DPRINTF(("requester doesn't have read access\n"));
1090 goto done2;
1091 }
1092
1093 #ifdef MAC
1094 error = mac_sysvmsq_check_msqrcv(td->td_ucred, msqkptr);
1095 if (error != 0)
1096 goto done2;
1097 #endif
1098
1099 msghdr = NULL;
1100 while (msghdr == NULL) {
1101 if (msgtyp == 0) {
1102 msghdr = msqkptr->u.msg_first;
1103 if (msghdr != NULL) {
1104 if (msgsz < msghdr->msg_ts &&
1105 (msgflg & MSG_NOERROR) == 0) {
1106 DPRINTF(("first message on the queue "
1107 "is too big (want %zu, got %d)\n",
1108 msgsz, msghdr->msg_ts));
1109 error = E2BIG;
1110 goto done2;
1111 }
1112 #ifdef MAC
1113 error = mac_sysvmsq_check_msgrcv(td->td_ucred,
1114 msghdr);
1115 if (error != 0)
1116 goto done2;
1117 #endif
1118 if (msqkptr->u.msg_first == msqkptr->u.msg_last) {
1119 msqkptr->u.msg_first = NULL;
1120 msqkptr->u.msg_last = NULL;
1121 } else {
1122 msqkptr->u.msg_first = msghdr->msg_next;
1123 if (msqkptr->u.msg_first == NULL)
1124 panic("msg_first/last screwed up #1");
1125 }
1126 }
1127 } else {
1128 struct msg *previous;
1129 struct msg **prev;
1130
1131 previous = NULL;
1132 prev = &(msqkptr->u.msg_first);
1133 while ((msghdr = *prev) != NULL) {
1134 /*
1135 * Is this message's type an exact match or is
1136 * this message's type less than or equal to
1137 * the absolute value of a negative msgtyp?
1138 * Note that the second half of this test can
1139 * NEVER be true if msgtyp is positive since
1140 * msg_type is always positive!
1141 */
1142
1143 if (msgtyp == msghdr->msg_type ||
1144 msghdr->msg_type <= -msgtyp) {
1145 DPRINTF(("found message type %ld, "
1146 "requested %ld\n",
1147 msghdr->msg_type, msgtyp));
1148 if (msgsz < msghdr->msg_ts &&
1149 (msgflg & MSG_NOERROR) == 0) {
1150 DPRINTF(("requested message "
1151 "on the queue is too big "
1152 "(want %zu, got %hu)\n",
1153 msgsz, msghdr->msg_ts));
1154 error = E2BIG;
1155 goto done2;
1156 }
1157 #ifdef MAC
1158 error = mac_sysvmsq_check_msgrcv(
1159 td->td_ucred, msghdr);
1160 if (error != 0)
1161 goto done2;
1162 #endif
1163 *prev = msghdr->msg_next;
1164 if (msghdr == msqkptr->u.msg_last) {
1165 if (previous == NULL) {
1166 if (prev !=
1167 &msqkptr->u.msg_first)
1168 panic("msg_first/last screwed up #2");
1169 msqkptr->u.msg_first =
1170 NULL;
1171 msqkptr->u.msg_last =
1172 NULL;
1173 } else {
1174 if (prev ==
1175 &msqkptr->u.msg_first)
1176 panic("msg_first/last screwed up #3");
1177 msqkptr->u.msg_last =
1178 previous;
1179 }
1180 }
1181 break;
1182 }
1183 previous = msghdr;
1184 prev = &(msghdr->msg_next);
1185 }
1186 }
1187
1188 /*
1189 * We've either extracted the msghdr for the appropriate
1190 * message or there isn't one.
1191 * If there is one then bail out of this loop.
1192 */
1193
1194 if (msghdr != NULL)
1195 break;
1196
1197 /*
1198 * Hmph! No message found. Does the user want to wait?
1199 */
1200
1201 if ((msgflg & IPC_NOWAIT) != 0) {
1202 DPRINTF(("no appropriate message found (msgtyp=%ld)\n",
1203 msgtyp));
1204 /* The SVID says to return ENOMSG. */
1205 error = ENOMSG;
1206 goto done2;
1207 }
1208
1209 /*
1210 * Wait for something to happen
1211 */
1212
1213 DPRINTF(("msgrcv: goodnight\n"));
1214 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH,
1215 "msgrcv", 0);
1216 DPRINTF(("msgrcv: good morning (error=%d)\n", error));
1217
1218 if (error != 0) {
1219 DPRINTF(("msgrcv: interrupted system call\n"));
1220 error = EINTR;
1221 goto done2;
1222 }
1223
1224 /*
1225 * Make sure that the msq queue still exists
1226 */
1227
1228 if (msqkptr->u.msg_qbytes == 0 ||
1229 msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) {
1230 DPRINTF(("msqid deleted\n"));
1231 error = EIDRM;
1232 goto done2;
1233 }
1234 }
1235
1236 /*
1237 * Return the message to the user.
1238 *
1239 * First, do the bookkeeping (before we risk being interrupted).
1240 */
1241
1242 msqkptr->u.msg_cbytes -= msghdr->msg_ts;
1243 msqkptr->u.msg_qnum--;
1244 msqkptr->u.msg_lrpid = td->td_proc->p_pid;
1245 msqkptr->u.msg_rtime = time_second;
1246
1247 racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, 1);
1248 racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msghdr->msg_ts);
1249
1250 /*
1251 * Make msgsz the actual amount that we'll be returning.
1252 * Note that this effectively truncates the message if it is too long
1253 * (since msgsz is never increased).
1254 */
1255
1256 DPRINTF(("found a message, msgsz=%zu, msg_ts=%hu\n", msgsz,
1257 msghdr->msg_ts));
1258 if (msgsz > msghdr->msg_ts)
1259 msgsz = msghdr->msg_ts;
1260 *mtype = msghdr->msg_type;
1261
1262 /*
1263 * Return the segments to the user
1264 */
1265
1266 next = msghdr->msg_spot;
1267 for (len = 0; len < msgsz; len += msginfo.msgssz) {
1268 size_t tlen;
1269
1270 if (msgsz - len > msginfo.msgssz)
1271 tlen = msginfo.msgssz;
1272 else
1273 tlen = msgsz - len;
1274 if (next <= -1)
1275 panic("next too low #3");
1276 if (next >= msginfo.msgseg)
1277 panic("next out of range #3");
1278 mtx_unlock(&msq_mtx);
1279 error = copyout(&msgpool[next * msginfo.msgssz], msgp, tlen);
1280 mtx_lock(&msq_mtx);
1281 if (error != 0) {
1282 DPRINTF(("error (%d) copying out message segment\n",
1283 error));
1284 msg_freehdr(msghdr);
1285 wakeup(msqkptr);
1286 goto done2;
1287 }
1288 msgp = (char *)msgp + tlen;
1289 next = msgmaps[next].next;
1290 }
1291
1292 /*
1293 * Done, return the actual number of bytes copied out.
1294 */
1295
1296 msg_freehdr(msghdr);
1297 wakeup(msqkptr);
1298 td->td_retval[0] = msgsz;
1299 done2:
1300 mtx_unlock(&msq_mtx);
1301 return (error);
1302 }
1303
1304 int
1305 sys_msgrcv(td, uap)
1306 struct thread *td;
1307 register struct msgrcv_args *uap;
1308 {
1309 int error;
1310 long mtype;
1311
1312 DPRINTF(("call to msgrcv(%d, %p, %zu, %ld, %d)\n", uap->msqid,
1313 uap->msgp, uap->msgsz, uap->msgtyp, uap->msgflg));
1314
1315 if ((error = kern_msgrcv(td, uap->msqid,
1316 (char *)uap->msgp + sizeof(mtype), uap->msgsz,
1317 uap->msgtyp, uap->msgflg, &mtype)) != 0)
1318 return (error);
1319 if ((error = copyout(&mtype, uap->msgp, sizeof(mtype))) != 0)
1320 DPRINTF(("error %d copying the message type\n", error));
1321 return (error);
1322 }
1323
1324 static int
1325 sysctl_msqids(SYSCTL_HANDLER_ARGS)
1326 {
1327
1328 return (SYSCTL_OUT(req, msqids,
1329 sizeof(struct msqid_kernel) * msginfo.msgmni));
1330 }
1331
1332 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmax, CTLFLAG_RD, &msginfo.msgmax, 0,
1333 "Maximum message size");
1334 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmni, CTLFLAG_RDTUN, &msginfo.msgmni, 0,
1335 "Number of message queue identifiers");
1336 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmnb, CTLFLAG_RDTUN, &msginfo.msgmnb, 0,
1337 "Maximum number of bytes in a queue");
1338 SYSCTL_INT(_kern_ipc, OID_AUTO, msgtql, CTLFLAG_RDTUN, &msginfo.msgtql, 0,
1339 "Maximum number of messages in the system");
1340 SYSCTL_INT(_kern_ipc, OID_AUTO, msgssz, CTLFLAG_RDTUN, &msginfo.msgssz, 0,
1341 "Size of a message segment");
1342 SYSCTL_INT(_kern_ipc, OID_AUTO, msgseg, CTLFLAG_RDTUN, &msginfo.msgseg, 0,
1343 "Number of message segments");
1344 SYSCTL_PROC(_kern_ipc, OID_AUTO, msqids, CTLTYPE_OPAQUE | CTLFLAG_RD,
1345 NULL, 0, sysctl_msqids, "", "Message queue IDs");
1346
1347 #ifdef COMPAT_FREEBSD32
1348 int
1349 freebsd32_msgsys(struct thread *td, struct freebsd32_msgsys_args *uap)
1350 {
1351
1352 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1353 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1354 switch (uap->which) {
1355 case 0:
1356 return (freebsd7_freebsd32_msgctl(td,
1357 (struct freebsd7_freebsd32_msgctl_args *)&uap->a2));
1358 case 2:
1359 return (freebsd32_msgsnd(td,
1360 (struct freebsd32_msgsnd_args *)&uap->a2));
1361 case 3:
1362 return (freebsd32_msgrcv(td,
1363 (struct freebsd32_msgrcv_args *)&uap->a2));
1364 default:
1365 return (sys_msgsys(td, (struct msgsys_args *)uap));
1366 }
1367 #else
1368 return (nosys(td, NULL));
1369 #endif
1370 }
1371
1372 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1373 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1374 int
1375 freebsd7_freebsd32_msgctl(struct thread *td,
1376 struct freebsd7_freebsd32_msgctl_args *uap)
1377 {
1378 struct msqid_ds msqbuf;
1379 struct msqid_ds32_old msqbuf32;
1380 int error;
1381
1382 if (uap->cmd == IPC_SET) {
1383 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32));
1384 if (error)
1385 return (error);
1386 freebsd32_ipcperm_old_in(&msqbuf32.msg_perm, &msqbuf.msg_perm);
1387 PTRIN_CP(msqbuf32, msqbuf, msg_first);
1388 PTRIN_CP(msqbuf32, msqbuf, msg_last);
1389 CP(msqbuf32, msqbuf, msg_cbytes);
1390 CP(msqbuf32, msqbuf, msg_qnum);
1391 CP(msqbuf32, msqbuf, msg_qbytes);
1392 CP(msqbuf32, msqbuf, msg_lspid);
1393 CP(msqbuf32, msqbuf, msg_lrpid);
1394 CP(msqbuf32, msqbuf, msg_stime);
1395 CP(msqbuf32, msqbuf, msg_rtime);
1396 CP(msqbuf32, msqbuf, msg_ctime);
1397 }
1398 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf);
1399 if (error)
1400 return (error);
1401 if (uap->cmd == IPC_STAT) {
1402 bzero(&msqbuf32, sizeof(msqbuf32));
1403 freebsd32_ipcperm_old_out(&msqbuf.msg_perm, &msqbuf32.msg_perm);
1404 PTROUT_CP(msqbuf, msqbuf32, msg_first);
1405 PTROUT_CP(msqbuf, msqbuf32, msg_last);
1406 CP(msqbuf, msqbuf32, msg_cbytes);
1407 CP(msqbuf, msqbuf32, msg_qnum);
1408 CP(msqbuf, msqbuf32, msg_qbytes);
1409 CP(msqbuf, msqbuf32, msg_lspid);
1410 CP(msqbuf, msqbuf32, msg_lrpid);
1411 CP(msqbuf, msqbuf32, msg_stime);
1412 CP(msqbuf, msqbuf32, msg_rtime);
1413 CP(msqbuf, msqbuf32, msg_ctime);
1414 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32));
1415 }
1416 return (error);
1417 }
1418 #endif
1419
1420 int
1421 freebsd32_msgctl(struct thread *td, struct freebsd32_msgctl_args *uap)
1422 {
1423 struct msqid_ds msqbuf;
1424 struct msqid_ds32 msqbuf32;
1425 int error;
1426
1427 if (uap->cmd == IPC_SET) {
1428 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32));
1429 if (error)
1430 return (error);
1431 freebsd32_ipcperm_in(&msqbuf32.msg_perm, &msqbuf.msg_perm);
1432 PTRIN_CP(msqbuf32, msqbuf, msg_first);
1433 PTRIN_CP(msqbuf32, msqbuf, msg_last);
1434 CP(msqbuf32, msqbuf, msg_cbytes);
1435 CP(msqbuf32, msqbuf, msg_qnum);
1436 CP(msqbuf32, msqbuf, msg_qbytes);
1437 CP(msqbuf32, msqbuf, msg_lspid);
1438 CP(msqbuf32, msqbuf, msg_lrpid);
1439 CP(msqbuf32, msqbuf, msg_stime);
1440 CP(msqbuf32, msqbuf, msg_rtime);
1441 CP(msqbuf32, msqbuf, msg_ctime);
1442 }
1443 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf);
1444 if (error)
1445 return (error);
1446 if (uap->cmd == IPC_STAT) {
1447 freebsd32_ipcperm_out(&msqbuf.msg_perm, &msqbuf32.msg_perm);
1448 PTROUT_CP(msqbuf, msqbuf32, msg_first);
1449 PTROUT_CP(msqbuf, msqbuf32, msg_last);
1450 CP(msqbuf, msqbuf32, msg_cbytes);
1451 CP(msqbuf, msqbuf32, msg_qnum);
1452 CP(msqbuf, msqbuf32, msg_qbytes);
1453 CP(msqbuf, msqbuf32, msg_lspid);
1454 CP(msqbuf, msqbuf32, msg_lrpid);
1455 CP(msqbuf, msqbuf32, msg_stime);
1456 CP(msqbuf, msqbuf32, msg_rtime);
1457 CP(msqbuf, msqbuf32, msg_ctime);
1458 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32));
1459 }
1460 return (error);
1461 }
1462
1463 int
1464 freebsd32_msgsnd(struct thread *td, struct freebsd32_msgsnd_args *uap)
1465 {
1466 const void *msgp;
1467 long mtype;
1468 int32_t mtype32;
1469 int error;
1470
1471 msgp = PTRIN(uap->msgp);
1472 if ((error = copyin(msgp, &mtype32, sizeof(mtype32))) != 0)
1473 return (error);
1474 mtype = mtype32;
1475 return (kern_msgsnd(td, uap->msqid,
1476 (const char *)msgp + sizeof(mtype32),
1477 uap->msgsz, uap->msgflg, mtype));
1478 }
1479
1480 int
1481 freebsd32_msgrcv(struct thread *td, struct freebsd32_msgrcv_args *uap)
1482 {
1483 void *msgp;
1484 long mtype;
1485 int32_t mtype32;
1486 int error;
1487
1488 msgp = PTRIN(uap->msgp);
1489 if ((error = kern_msgrcv(td, uap->msqid,
1490 (char *)msgp + sizeof(mtype32), uap->msgsz,
1491 uap->msgtyp, uap->msgflg, &mtype)) != 0)
1492 return (error);
1493 mtype32 = (int32_t)mtype;
1494 return (copyout(&mtype32, msgp, sizeof(mtype32)));
1495 }
1496 #endif
1497
1498 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1499 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1500
1501 /* XXX casting to (sy_call_t *) is bogus, as usual. */
1502 static sy_call_t *msgcalls[] = {
1503 (sy_call_t *)freebsd7_msgctl, (sy_call_t *)sys_msgget,
1504 (sy_call_t *)sys_msgsnd, (sy_call_t *)sys_msgrcv
1505 };
1506
1507 /*
1508 * Entry point for all MSG calls.
1509 */
1510 int
1511 sys_msgsys(td, uap)
1512 struct thread *td;
1513 /* XXX actually varargs. */
1514 struct msgsys_args /* {
1515 int which;
1516 int a2;
1517 int a3;
1518 int a4;
1519 int a5;
1520 int a6;
1521 } */ *uap;
1522 {
1523 int error;
1524
1525 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
1526 return (ENOSYS);
1527 if (uap->which < 0 ||
1528 uap->which >= sizeof(msgcalls)/sizeof(msgcalls[0]))
1529 return (EINVAL);
1530 error = (*msgcalls[uap->which])(td, &uap->a2);
1531 return (error);
1532 }
1533
1534 #ifndef CP
1535 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0)
1536 #endif
1537
1538 #ifndef _SYS_SYSPROTO_H_
1539 struct freebsd7_msgctl_args {
1540 int msqid;
1541 int cmd;
1542 struct msqid_ds_old *buf;
1543 };
1544 #endif
1545 int
1546 freebsd7_msgctl(td, uap)
1547 struct thread *td;
1548 struct freebsd7_msgctl_args *uap;
1549 {
1550 struct msqid_ds_old msqold;
1551 struct msqid_ds msqbuf;
1552 int error;
1553
1554 DPRINTF(("call to freebsd7_msgctl(%d, %d, %p)\n", uap->msqid, uap->cmd,
1555 uap->buf));
1556 if (uap->cmd == IPC_SET) {
1557 error = copyin(uap->buf, &msqold, sizeof(msqold));
1558 if (error)
1559 return (error);
1560 ipcperm_old2new(&msqold.msg_perm, &msqbuf.msg_perm);
1561 CP(msqold, msqbuf, msg_first);
1562 CP(msqold, msqbuf, msg_last);
1563 CP(msqold, msqbuf, msg_cbytes);
1564 CP(msqold, msqbuf, msg_qnum);
1565 CP(msqold, msqbuf, msg_qbytes);
1566 CP(msqold, msqbuf, msg_lspid);
1567 CP(msqold, msqbuf, msg_lrpid);
1568 CP(msqold, msqbuf, msg_stime);
1569 CP(msqold, msqbuf, msg_rtime);
1570 CP(msqold, msqbuf, msg_ctime);
1571 }
1572 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf);
1573 if (error)
1574 return (error);
1575 if (uap->cmd == IPC_STAT) {
1576 bzero(&msqold, sizeof(msqold));
1577 ipcperm_new2old(&msqbuf.msg_perm, &msqold.msg_perm);
1578 CP(msqbuf, msqold, msg_first);
1579 CP(msqbuf, msqold, msg_last);
1580 CP(msqbuf, msqold, msg_cbytes);
1581 CP(msqbuf, msqold, msg_qnum);
1582 CP(msqbuf, msqold, msg_qbytes);
1583 CP(msqbuf, msqold, msg_lspid);
1584 CP(msqbuf, msqold, msg_lrpid);
1585 CP(msqbuf, msqold, msg_stime);
1586 CP(msqbuf, msqold, msg_rtime);
1587 CP(msqbuf, msqold, msg_ctime);
1588 error = copyout(&msqold, uap->buf, sizeof(struct msqid_ds_old));
1589 }
1590 return (error);
1591 }
1592
1593 #undef CP
1594
1595 #endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 ||
1596 COMPAT_FREEBSD7 */
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