Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/sysv_msg.c
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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/8.1/sys/kern/sysv_msg.c 206349 2010-04-07 14:46:28Z kib $"); 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/syscall.h> 67 #include <sys/syscallsubr.h> 68 #include <sys/sysent.h> 69 #include <sys/sysctl.h> 70 #include <sys/malloc.h> 71 #include <sys/jail.h> 72 73 #include <security/mac/mac_framework.h> 74 75 static MALLOC_DEFINE(M_MSG, "msg", "SVID compatible message queues"); 76 77 static int msginit(void); 78 static int msgunload(void); 79 static int sysvmsg_modload(struct module *, int, void *); 80 81 #ifdef MSG_DEBUG 82 #define DPRINTF(a) printf a 83 #else 84 #define DPRINTF(a) (void)0 85 #endif 86 87 static void msg_freehdr(struct msg *msghdr); 88 89 #ifndef MSGSSZ 90 #define MSGSSZ 8 /* Each segment must be 2^N long */ 91 #endif 92 #ifndef MSGSEG 93 #define MSGSEG 2048 /* must be less than 32767 */ 94 #endif 95 #define MSGMAX (MSGSSZ*MSGSEG) 96 #ifndef MSGMNB 97 #define MSGMNB 2048 /* max # of bytes in a queue */ 98 #endif 99 #ifndef MSGMNI 100 #define MSGMNI 40 101 #endif 102 #ifndef MSGTQL 103 #define MSGTQL 40 104 #endif 105 106 /* 107 * Based on the configuration parameters described in an SVR2 (yes, two) 108 * config(1m) man page. 109 * 110 * Each message is broken up and stored in segments that are msgssz bytes 111 * long. For efficiency reasons, this should be a power of two. Also, 112 * it doesn't make sense if it is less than 8 or greater than about 256. 113 * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of 114 * two between 8 and 1024 inclusive (and panic's if it isn't). 115 */ 116 struct msginfo msginfo = { 117 MSGMAX, /* max chars in a message */ 118 MSGMNI, /* # of message queue identifiers */ 119 MSGMNB, /* max chars in a queue */ 120 MSGTQL, /* max messages in system */ 121 MSGSSZ, /* size of a message segment */ 122 /* (must be small power of 2 greater than 4) */ 123 MSGSEG /* number of message segments */ 124 }; 125 126 /* 127 * macros to convert between msqid_ds's and msqid's. 128 * (specific to this implementation) 129 */ 130 #define MSQID(ix,ds) ((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000)) 131 #define MSQID_IX(id) ((id) & 0xffff) 132 #define MSQID_SEQ(id) (((id) >> 16) & 0xffff) 133 134 /* 135 * The rest of this file is specific to this particular implementation. 136 */ 137 138 struct msgmap { 139 short next; /* next segment in buffer */ 140 /* -1 -> available */ 141 /* 0..(MSGSEG-1) -> index of next segment */ 142 }; 143 144 #define MSG_LOCKED 01000 /* Is this msqid_ds locked? */ 145 146 static int nfree_msgmaps; /* # of free map entries */ 147 static short free_msgmaps; /* head of linked list of free map entries */ 148 static struct msg *free_msghdrs;/* list of free msg headers */ 149 static char *msgpool; /* MSGMAX byte long msg buffer pool */ 150 static struct msgmap *msgmaps; /* MSGSEG msgmap structures */ 151 static struct msg *msghdrs; /* MSGTQL msg headers */ 152 static struct msqid_kernel *msqids; /* MSGMNI msqid_kernel struct's */ 153 static struct mtx msq_mtx; /* global mutex for message queues. */ 154 155 static struct syscall_helper_data msg_syscalls[] = { 156 SYSCALL_INIT_HELPER(msgctl), 157 SYSCALL_INIT_HELPER(msgget), 158 SYSCALL_INIT_HELPER(msgsnd), 159 SYSCALL_INIT_HELPER(msgrcv), 160 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 161 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 162 SYSCALL_INIT_HELPER(msgsys), 163 SYSCALL_INIT_HELPER(freebsd7_msgctl), 164 #endif 165 SYSCALL_INIT_LAST 166 }; 167 168 #ifdef COMPAT_FREEBSD32 169 #include <compat/freebsd32/freebsd32.h> 170 #include <compat/freebsd32/freebsd32_ipc.h> 171 #include <compat/freebsd32/freebsd32_proto.h> 172 #include <compat/freebsd32/freebsd32_signal.h> 173 #include <compat/freebsd32/freebsd32_syscall.h> 174 #include <compat/freebsd32/freebsd32_util.h> 175 176 static struct syscall_helper_data msg32_syscalls[] = { 177 SYSCALL32_INIT_HELPER(freebsd32_msgctl), 178 SYSCALL32_INIT_HELPER(freebsd32_msgsnd), 179 SYSCALL32_INIT_HELPER(freebsd32_msgrcv), 180 SYSCALL32_INIT_HELPER(msgget), 181 SYSCALL32_INIT_HELPER(freebsd32_msgsys), 182 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 183 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 184 SYSCALL32_INIT_HELPER(freebsd7_freebsd32_msgctl), 185 #endif 186 SYSCALL_INIT_LAST 187 }; 188 #endif 189 190 static int 191 msginit() 192 { 193 int i, error; 194 195 TUNABLE_INT_FETCH("kern.ipc.msgseg", &msginfo.msgseg); 196 TUNABLE_INT_FETCH("kern.ipc.msgssz", &msginfo.msgssz); 197 msginfo.msgmax = msginfo.msgseg * msginfo.msgssz; 198 TUNABLE_INT_FETCH("kern.ipc.msgmni", &msginfo.msgmni); 199 TUNABLE_INT_FETCH("kern.ipc.msgmnb", &msginfo.msgmnb); 200 TUNABLE_INT_FETCH("kern.ipc.msgtql", &msginfo.msgtql); 201 202 msgpool = malloc(msginfo.msgmax, M_MSG, M_WAITOK); 203 if (msgpool == NULL) 204 panic("msgpool is NULL"); 205 msgmaps = malloc(sizeof(struct msgmap) * msginfo.msgseg, M_MSG, M_WAITOK); 206 if (msgmaps == NULL) 207 panic("msgmaps is NULL"); 208 msghdrs = malloc(sizeof(struct msg) * msginfo.msgtql, M_MSG, M_WAITOK); 209 if (msghdrs == NULL) 210 panic("msghdrs is NULL"); 211 msqids = malloc(sizeof(struct msqid_kernel) * msginfo.msgmni, M_MSG, 212 M_WAITOK); 213 if (msqids == NULL) 214 panic("msqids is NULL"); 215 216 /* 217 * msginfo.msgssz should be a power of two for efficiency reasons. 218 * It is also pretty silly if msginfo.msgssz is less than 8 219 * or greater than about 256 so ... 220 */ 221 222 i = 8; 223 while (i < 1024 && i != msginfo.msgssz) 224 i <<= 1; 225 if (i != msginfo.msgssz) { 226 DPRINTF(("msginfo.msgssz=%d (0x%x)\n", msginfo.msgssz, 227 msginfo.msgssz)); 228 panic("msginfo.msgssz not a small power of 2"); 229 } 230 231 if (msginfo.msgseg > 32767) { 232 DPRINTF(("msginfo.msgseg=%d\n", msginfo.msgseg)); 233 panic("msginfo.msgseg > 32767"); 234 } 235 236 if (msgmaps == NULL) 237 panic("msgmaps is NULL"); 238 239 for (i = 0; i < msginfo.msgseg; i++) { 240 if (i > 0) 241 msgmaps[i-1].next = i; 242 msgmaps[i].next = -1; /* implies entry is available */ 243 } 244 free_msgmaps = 0; 245 nfree_msgmaps = msginfo.msgseg; 246 247 if (msghdrs == NULL) 248 panic("msghdrs is NULL"); 249 250 for (i = 0; i < msginfo.msgtql; i++) { 251 msghdrs[i].msg_type = 0; 252 if (i > 0) 253 msghdrs[i-1].msg_next = &msghdrs[i]; 254 msghdrs[i].msg_next = NULL; 255 #ifdef MAC 256 mac_sysvmsg_init(&msghdrs[i]); 257 #endif 258 } 259 free_msghdrs = &msghdrs[0]; 260 261 if (msqids == NULL) 262 panic("msqids is NULL"); 263 264 for (i = 0; i < msginfo.msgmni; i++) { 265 msqids[i].u.msg_qbytes = 0; /* implies entry is available */ 266 msqids[i].u.msg_perm.seq = 0; /* reset to a known value */ 267 msqids[i].u.msg_perm.mode = 0; 268 #ifdef MAC 269 mac_sysvmsq_init(&msqids[i]); 270 #endif 271 } 272 mtx_init(&msq_mtx, "msq", NULL, MTX_DEF); 273 274 error = syscall_helper_register(msg_syscalls); 275 if (error != 0) 276 return (error); 277 #ifdef COMPAT_FREEBSD32 278 error = syscall32_helper_register(msg32_syscalls); 279 if (error != 0) 280 return (error); 281 #endif 282 return (0); 283 } 284 285 static int 286 msgunload() 287 { 288 struct msqid_kernel *msqkptr; 289 int msqid; 290 #ifdef MAC 291 int i; 292 #endif 293 294 syscall_helper_unregister(msg_syscalls); 295 #ifdef COMPAT_FREEBSD32 296 syscall32_helper_unregister(msg32_syscalls); 297 #endif 298 299 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 300 /* 301 * Look for an unallocated and unlocked msqid_ds. 302 * msqid_ds's can be locked by msgsnd or msgrcv while 303 * they are copying the message in/out. We can't 304 * re-use the entry until they release it. 305 */ 306 msqkptr = &msqids[msqid]; 307 if (msqkptr->u.msg_qbytes != 0 || 308 (msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 309 break; 310 } 311 if (msqid != msginfo.msgmni) 312 return (EBUSY); 313 314 #ifdef MAC 315 for (i = 0; i < msginfo.msgtql; i++) 316 mac_sysvmsg_destroy(&msghdrs[i]); 317 for (msqid = 0; msqid < msginfo.msgmni; msqid++) 318 mac_sysvmsq_destroy(&msqids[msqid]); 319 #endif 320 free(msgpool, M_MSG); 321 free(msgmaps, M_MSG); 322 free(msghdrs, M_MSG); 323 free(msqids, M_MSG); 324 mtx_destroy(&msq_mtx); 325 return (0); 326 } 327 328 329 static int 330 sysvmsg_modload(struct module *module, int cmd, void *arg) 331 { 332 int error = 0; 333 334 switch (cmd) { 335 case MOD_LOAD: 336 error = msginit(); 337 if (error != 0) 338 msgunload(); 339 break; 340 case MOD_UNLOAD: 341 error = msgunload(); 342 break; 343 case MOD_SHUTDOWN: 344 break; 345 default: 346 error = EINVAL; 347 break; 348 } 349 return (error); 350 } 351 352 static moduledata_t sysvmsg_mod = { 353 "sysvmsg", 354 &sysvmsg_modload, 355 NULL 356 }; 357 358 DECLARE_MODULE(sysvmsg, sysvmsg_mod, SI_SUB_SYSV_MSG, SI_ORDER_FIRST); 359 MODULE_VERSION(sysvmsg, 1); 360 361 static void 362 msg_freehdr(msghdr) 363 struct msg *msghdr; 364 { 365 while (msghdr->msg_ts > 0) { 366 short next; 367 if (msghdr->msg_spot < 0 || msghdr->msg_spot >= msginfo.msgseg) 368 panic("msghdr->msg_spot out of range"); 369 next = msgmaps[msghdr->msg_spot].next; 370 msgmaps[msghdr->msg_spot].next = free_msgmaps; 371 free_msgmaps = msghdr->msg_spot; 372 nfree_msgmaps++; 373 msghdr->msg_spot = next; 374 if (msghdr->msg_ts >= msginfo.msgssz) 375 msghdr->msg_ts -= msginfo.msgssz; 376 else 377 msghdr->msg_ts = 0; 378 } 379 if (msghdr->msg_spot != -1) 380 panic("msghdr->msg_spot != -1"); 381 msghdr->msg_next = free_msghdrs; 382 free_msghdrs = msghdr; 383 #ifdef MAC 384 mac_sysvmsg_cleanup(msghdr); 385 #endif 386 } 387 388 #ifndef _SYS_SYSPROTO_H_ 389 struct msgctl_args { 390 int msqid; 391 int cmd; 392 struct msqid_ds *buf; 393 }; 394 #endif 395 int 396 msgctl(td, uap) 397 struct thread *td; 398 register struct msgctl_args *uap; 399 { 400 int msqid = uap->msqid; 401 int cmd = uap->cmd; 402 struct msqid_ds msqbuf; 403 int error; 404 405 DPRINTF(("call to msgctl(%d, %d, %p)\n", msqid, cmd, uap->buf)); 406 if (cmd == IPC_SET && 407 (error = copyin(uap->buf, &msqbuf, sizeof(msqbuf))) != 0) 408 return (error); 409 error = kern_msgctl(td, msqid, cmd, &msqbuf); 410 if (cmd == IPC_STAT && error == 0) 411 error = copyout(&msqbuf, uap->buf, sizeof(struct msqid_ds)); 412 return (error); 413 } 414 415 int 416 kern_msgctl(td, msqid, cmd, msqbuf) 417 struct thread *td; 418 int msqid; 419 int cmd; 420 struct msqid_ds *msqbuf; 421 { 422 int rval, error, msqix; 423 register struct msqid_kernel *msqkptr; 424 425 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 426 return (ENOSYS); 427 428 msqix = IPCID_TO_IX(msqid); 429 430 if (msqix < 0 || msqix >= msginfo.msgmni) { 431 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 432 msginfo.msgmni)); 433 return (EINVAL); 434 } 435 436 msqkptr = &msqids[msqix]; 437 438 mtx_lock(&msq_mtx); 439 if (msqkptr->u.msg_qbytes == 0) { 440 DPRINTF(("no such msqid\n")); 441 error = EINVAL; 442 goto done2; 443 } 444 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 445 DPRINTF(("wrong sequence number\n")); 446 error = EINVAL; 447 goto done2; 448 } 449 #ifdef MAC 450 error = mac_sysvmsq_check_msqctl(td->td_ucred, msqkptr, cmd); 451 if (error != 0) 452 goto done2; 453 #endif 454 455 error = 0; 456 rval = 0; 457 458 switch (cmd) { 459 460 case IPC_RMID: 461 { 462 struct msg *msghdr; 463 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 464 goto done2; 465 466 #ifdef MAC 467 /* 468 * Check that the thread has MAC access permissions to 469 * individual msghdrs. Note: We need to do this in a 470 * separate loop because the actual loop alters the 471 * msq/msghdr info as it progresses, and there is no going 472 * back if half the way through we discover that the 473 * thread cannot free a certain msghdr. The msq will get 474 * into an inconsistent state. 475 */ 476 for (msghdr = msqkptr->u.msg_first; msghdr != NULL; 477 msghdr = msghdr->msg_next) { 478 error = mac_sysvmsq_check_msgrmid(td->td_ucred, msghdr); 479 if (error != 0) 480 goto done2; 481 } 482 #endif 483 484 /* Free the message headers */ 485 msghdr = msqkptr->u.msg_first; 486 while (msghdr != NULL) { 487 struct msg *msghdr_tmp; 488 489 /* Free the segments of each message */ 490 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 491 msqkptr->u.msg_qnum--; 492 msghdr_tmp = msghdr; 493 msghdr = msghdr->msg_next; 494 msg_freehdr(msghdr_tmp); 495 } 496 497 if (msqkptr->u.msg_cbytes != 0) 498 panic("msg_cbytes is screwed up"); 499 if (msqkptr->u.msg_qnum != 0) 500 panic("msg_qnum is screwed up"); 501 502 msqkptr->u.msg_qbytes = 0; /* Mark it as free */ 503 504 #ifdef MAC 505 mac_sysvmsq_cleanup(msqkptr); 506 #endif 507 508 wakeup(msqkptr); 509 } 510 511 break; 512 513 case IPC_SET: 514 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 515 goto done2; 516 if (msqbuf->msg_qbytes > msqkptr->u.msg_qbytes) { 517 error = priv_check(td, PRIV_IPC_MSGSIZE); 518 if (error) 519 goto done2; 520 } 521 if (msqbuf->msg_qbytes > msginfo.msgmnb) { 522 DPRINTF(("can't increase msg_qbytes beyond %d" 523 "(truncating)\n", msginfo.msgmnb)); 524 msqbuf->msg_qbytes = msginfo.msgmnb; /* silently restrict qbytes to system limit */ 525 } 526 if (msqbuf->msg_qbytes == 0) { 527 DPRINTF(("can't reduce msg_qbytes to 0\n")); 528 error = EINVAL; /* non-standard errno! */ 529 goto done2; 530 } 531 msqkptr->u.msg_perm.uid = msqbuf->msg_perm.uid; /* change the owner */ 532 msqkptr->u.msg_perm.gid = msqbuf->msg_perm.gid; /* change the owner */ 533 msqkptr->u.msg_perm.mode = (msqkptr->u.msg_perm.mode & ~0777) | 534 (msqbuf->msg_perm.mode & 0777); 535 msqkptr->u.msg_qbytes = msqbuf->msg_qbytes; 536 msqkptr->u.msg_ctime = time_second; 537 break; 538 539 case IPC_STAT: 540 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 541 DPRINTF(("requester doesn't have read access\n")); 542 goto done2; 543 } 544 *msqbuf = msqkptr->u; 545 break; 546 547 default: 548 DPRINTF(("invalid command %d\n", cmd)); 549 error = EINVAL; 550 goto done2; 551 } 552 553 if (error == 0) 554 td->td_retval[0] = rval; 555 done2: 556 mtx_unlock(&msq_mtx); 557 return (error); 558 } 559 560 #ifndef _SYS_SYSPROTO_H_ 561 struct msgget_args { 562 key_t key; 563 int msgflg; 564 }; 565 #endif 566 int 567 msgget(td, uap) 568 struct thread *td; 569 register struct msgget_args *uap; 570 { 571 int msqid, error = 0; 572 int key = uap->key; 573 int msgflg = uap->msgflg; 574 struct ucred *cred = td->td_ucred; 575 register struct msqid_kernel *msqkptr = NULL; 576 577 DPRINTF(("msgget(0x%x, 0%o)\n", key, msgflg)); 578 579 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 580 return (ENOSYS); 581 582 mtx_lock(&msq_mtx); 583 if (key != IPC_PRIVATE) { 584 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 585 msqkptr = &msqids[msqid]; 586 if (msqkptr->u.msg_qbytes != 0 && 587 msqkptr->u.msg_perm.key == key) 588 break; 589 } 590 if (msqid < msginfo.msgmni) { 591 DPRINTF(("found public key\n")); 592 if ((msgflg & IPC_CREAT) && (msgflg & IPC_EXCL)) { 593 DPRINTF(("not exclusive\n")); 594 error = EEXIST; 595 goto done2; 596 } 597 if ((error = ipcperm(td, &msqkptr->u.msg_perm, 598 msgflg & 0700))) { 599 DPRINTF(("requester doesn't have 0%o access\n", 600 msgflg & 0700)); 601 goto done2; 602 } 603 #ifdef MAC 604 error = mac_sysvmsq_check_msqget(cred, msqkptr); 605 if (error != 0) 606 goto done2; 607 #endif 608 goto found; 609 } 610 } 611 612 DPRINTF(("need to allocate the msqid_ds\n")); 613 if (key == IPC_PRIVATE || (msgflg & IPC_CREAT)) { 614 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 615 /* 616 * Look for an unallocated and unlocked msqid_ds. 617 * msqid_ds's can be locked by msgsnd or msgrcv while 618 * they are copying the message in/out. We can't 619 * re-use the entry until they release it. 620 */ 621 msqkptr = &msqids[msqid]; 622 if (msqkptr->u.msg_qbytes == 0 && 623 (msqkptr->u.msg_perm.mode & MSG_LOCKED) == 0) 624 break; 625 } 626 if (msqid == msginfo.msgmni) { 627 DPRINTF(("no more msqid_ds's available\n")); 628 error = ENOSPC; 629 goto done2; 630 } 631 DPRINTF(("msqid %d is available\n", msqid)); 632 msqkptr->u.msg_perm.key = key; 633 msqkptr->u.msg_perm.cuid = cred->cr_uid; 634 msqkptr->u.msg_perm.uid = cred->cr_uid; 635 msqkptr->u.msg_perm.cgid = cred->cr_gid; 636 msqkptr->u.msg_perm.gid = cred->cr_gid; 637 msqkptr->u.msg_perm.mode = (msgflg & 0777); 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; 688 689 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 690 return (ENOSYS); 691 692 mtx_lock(&msq_mtx); 693 msqix = IPCID_TO_IX(msqid); 694 695 if (msqix < 0 || msqix >= msginfo.msgmni) { 696 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 697 msginfo.msgmni)); 698 error = EINVAL; 699 goto done2; 700 } 701 702 msqkptr = &msqids[msqix]; 703 if (msqkptr->u.msg_qbytes == 0) { 704 DPRINTF(("no such message queue id\n")); 705 error = EINVAL; 706 goto done2; 707 } 708 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 709 DPRINTF(("wrong sequence number\n")); 710 error = EINVAL; 711 goto done2; 712 } 713 714 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_W))) { 715 DPRINTF(("requester doesn't have write access\n")); 716 goto done2; 717 } 718 719 #ifdef MAC 720 error = mac_sysvmsq_check_msqsnd(td->td_ucred, msqkptr); 721 if (error != 0) 722 goto done2; 723 #endif 724 725 segs_needed = (msgsz + msginfo.msgssz - 1) / msginfo.msgssz; 726 DPRINTF(("msgsz=%zu, msgssz=%d, segs_needed=%d\n", msgsz, 727 msginfo.msgssz, segs_needed)); 728 for (;;) { 729 int need_more_resources = 0; 730 731 /* 732 * check msgsz 733 * (inside this loop in case msg_qbytes changes while we sleep) 734 */ 735 736 if (msgsz > msqkptr->u.msg_qbytes) { 737 DPRINTF(("msgsz > msqkptr->u.msg_qbytes\n")); 738 error = EINVAL; 739 goto done2; 740 } 741 742 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) { 743 DPRINTF(("msqid is locked\n")); 744 need_more_resources = 1; 745 } 746 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) { 747 DPRINTF(("msgsz + msg_cbytes > msg_qbytes\n")); 748 need_more_resources = 1; 749 } 750 if (segs_needed > nfree_msgmaps) { 751 DPRINTF(("segs_needed > nfree_msgmaps\n")); 752 need_more_resources = 1; 753 } 754 if (free_msghdrs == NULL) { 755 DPRINTF(("no more msghdrs\n")); 756 need_more_resources = 1; 757 } 758 759 if (need_more_resources) { 760 int we_own_it; 761 762 if ((msgflg & IPC_NOWAIT) != 0) { 763 DPRINTF(("need more resources but caller " 764 "doesn't want to wait\n")); 765 error = EAGAIN; 766 goto done2; 767 } 768 769 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) { 770 DPRINTF(("we don't own the msqid_ds\n")); 771 we_own_it = 0; 772 } else { 773 /* Force later arrivals to wait for our 774 request */ 775 DPRINTF(("we own the msqid_ds\n")); 776 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 777 we_own_it = 1; 778 } 779 DPRINTF(("msgsnd: goodnight\n")); 780 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 781 "msgsnd", hz); 782 DPRINTF(("msgsnd: good morning, error=%d\n", error)); 783 if (we_own_it) 784 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 785 if (error == EWOULDBLOCK) { 786 DPRINTF(("msgsnd: timed out\n")); 787 continue; 788 } 789 if (error != 0) { 790 DPRINTF(("msgsnd: interrupted system call\n")); 791 error = EINTR; 792 goto done2; 793 } 794 795 /* 796 * Make sure that the msq queue still exists 797 */ 798 799 if (msqkptr->u.msg_qbytes == 0) { 800 DPRINTF(("msqid deleted\n")); 801 error = EIDRM; 802 goto done2; 803 } 804 805 } else { 806 DPRINTF(("got all the resources that we need\n")); 807 break; 808 } 809 } 810 811 /* 812 * We have the resources that we need. 813 * Make sure! 814 */ 815 816 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) 817 panic("msg_perm.mode & MSG_LOCKED"); 818 if (segs_needed > nfree_msgmaps) 819 panic("segs_needed > nfree_msgmaps"); 820 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) 821 panic("msgsz + msg_cbytes > msg_qbytes"); 822 if (free_msghdrs == NULL) 823 panic("no more msghdrs"); 824 825 /* 826 * Re-lock the msqid_ds in case we page-fault when copying in the 827 * message 828 */ 829 830 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 831 panic("msqid_ds is already locked"); 832 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 833 834 /* 835 * Allocate a message header 836 */ 837 838 msghdr = free_msghdrs; 839 free_msghdrs = msghdr->msg_next; 840 msghdr->msg_spot = -1; 841 msghdr->msg_ts = msgsz; 842 msghdr->msg_type = mtype; 843 #ifdef MAC 844 /* 845 * XXXMAC: Should the mac_sysvmsq_check_msgmsq check follow here 846 * immediately? Or, should it be checked just before the msg is 847 * enqueued in the msgq (as it is done now)? 848 */ 849 mac_sysvmsg_create(td->td_ucred, msqkptr, msghdr); 850 #endif 851 852 /* 853 * Allocate space for the message 854 */ 855 856 while (segs_needed > 0) { 857 if (nfree_msgmaps <= 0) 858 panic("not enough msgmaps"); 859 if (free_msgmaps == -1) 860 panic("nil free_msgmaps"); 861 next = free_msgmaps; 862 if (next <= -1) 863 panic("next too low #1"); 864 if (next >= msginfo.msgseg) 865 panic("next out of range #1"); 866 DPRINTF(("allocating segment %d to message\n", next)); 867 free_msgmaps = msgmaps[next].next; 868 nfree_msgmaps--; 869 msgmaps[next].next = msghdr->msg_spot; 870 msghdr->msg_spot = next; 871 segs_needed--; 872 } 873 874 /* 875 * Validate the message type 876 */ 877 878 if (msghdr->msg_type < 1) { 879 msg_freehdr(msghdr); 880 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 881 wakeup(msqkptr); 882 DPRINTF(("mtype (%ld) < 1\n", msghdr->msg_type)); 883 error = EINVAL; 884 goto done2; 885 } 886 887 /* 888 * Copy in the message body 889 */ 890 891 next = msghdr->msg_spot; 892 while (msgsz > 0) { 893 size_t tlen; 894 if (msgsz > msginfo.msgssz) 895 tlen = msginfo.msgssz; 896 else 897 tlen = msgsz; 898 if (next <= -1) 899 panic("next too low #2"); 900 if (next >= msginfo.msgseg) 901 panic("next out of range #2"); 902 mtx_unlock(&msq_mtx); 903 if ((error = copyin(msgp, &msgpool[next * msginfo.msgssz], 904 tlen)) != 0) { 905 mtx_lock(&msq_mtx); 906 DPRINTF(("error %d copying in message segment\n", 907 error)); 908 msg_freehdr(msghdr); 909 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 910 wakeup(msqkptr); 911 goto done2; 912 } 913 mtx_lock(&msq_mtx); 914 msgsz -= tlen; 915 msgp = (const char *)msgp + tlen; 916 next = msgmaps[next].next; 917 } 918 if (next != -1) 919 panic("didn't use all the msg segments"); 920 921 /* 922 * We've got the message. Unlock the msqid_ds. 923 */ 924 925 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 926 927 /* 928 * Make sure that the msqid_ds is still allocated. 929 */ 930 931 if (msqkptr->u.msg_qbytes == 0) { 932 msg_freehdr(msghdr); 933 wakeup(msqkptr); 934 error = EIDRM; 935 goto done2; 936 } 937 938 #ifdef MAC 939 /* 940 * Note: Since the task/thread allocates the msghdr and usually 941 * primes it with its own MAC label, for a majority of policies, it 942 * won't be necessary to check whether the msghdr has access 943 * permissions to the msgq. The mac_sysvmsq_check_msqsnd check would 944 * suffice in that case. However, this hook may be required where 945 * individual policies derive a non-identical label for the msghdr 946 * from the current thread label and may want to check the msghdr 947 * enqueue permissions, along with read/write permissions to the 948 * msgq. 949 */ 950 error = mac_sysvmsq_check_msgmsq(td->td_ucred, msghdr, msqkptr); 951 if (error != 0) { 952 msg_freehdr(msghdr); 953 wakeup(msqkptr); 954 goto done2; 955 } 956 #endif 957 958 /* 959 * Put the message into the queue 960 */ 961 if (msqkptr->u.msg_first == NULL) { 962 msqkptr->u.msg_first = msghdr; 963 msqkptr->u.msg_last = msghdr; 964 } else { 965 msqkptr->u.msg_last->msg_next = msghdr; 966 msqkptr->u.msg_last = msghdr; 967 } 968 msqkptr->u.msg_last->msg_next = NULL; 969 970 msqkptr->u.msg_cbytes += msghdr->msg_ts; 971 msqkptr->u.msg_qnum++; 972 msqkptr->u.msg_lspid = td->td_proc->p_pid; 973 msqkptr->u.msg_stime = time_second; 974 975 wakeup(msqkptr); 976 td->td_retval[0] = 0; 977 done2: 978 mtx_unlock(&msq_mtx); 979 return (error); 980 } 981 982 int 983 msgsnd(td, uap) 984 struct thread *td; 985 register struct msgsnd_args *uap; 986 { 987 int error; 988 long mtype; 989 990 DPRINTF(("call to msgsnd(%d, %p, %zu, %d)\n", uap->msqid, uap->msgp, 991 uap->msgsz, uap->msgflg)); 992 993 if ((error = copyin(uap->msgp, &mtype, sizeof(mtype))) != 0) { 994 DPRINTF(("error %d copying the message type\n", error)); 995 return (error); 996 } 997 return (kern_msgsnd(td, uap->msqid, 998 (const char *)uap->msgp + sizeof(mtype), 999 uap->msgsz, uap->msgflg, mtype)); 1000 } 1001 1002 #ifndef _SYS_SYSPROTO_H_ 1003 struct msgrcv_args { 1004 int msqid; 1005 void *msgp; 1006 size_t msgsz; 1007 long msgtyp; 1008 int msgflg; 1009 }; 1010 #endif 1011 int 1012 kern_msgrcv(td, msqid, msgp, msgsz, msgtyp, msgflg, mtype) 1013 struct thread *td; 1014 int msqid; 1015 void *msgp; /* XXX msgp is actually mtext. */ 1016 size_t msgsz; 1017 long msgtyp; 1018 int msgflg; 1019 long *mtype; 1020 { 1021 size_t len; 1022 register struct msqid_kernel *msqkptr; 1023 register struct msg *msghdr; 1024 int msqix, error = 0; 1025 short next; 1026 1027 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 1028 return (ENOSYS); 1029 1030 msqix = IPCID_TO_IX(msqid); 1031 1032 if (msqix < 0 || msqix >= msginfo.msgmni) { 1033 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 1034 msginfo.msgmni)); 1035 return (EINVAL); 1036 } 1037 1038 msqkptr = &msqids[msqix]; 1039 mtx_lock(&msq_mtx); 1040 if (msqkptr->u.msg_qbytes == 0) { 1041 DPRINTF(("no such message queue id\n")); 1042 error = EINVAL; 1043 goto done2; 1044 } 1045 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1046 DPRINTF(("wrong sequence number\n")); 1047 error = EINVAL; 1048 goto done2; 1049 } 1050 1051 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 1052 DPRINTF(("requester doesn't have read access\n")); 1053 goto done2; 1054 } 1055 1056 #ifdef MAC 1057 error = mac_sysvmsq_check_msqrcv(td->td_ucred, msqkptr); 1058 if (error != 0) 1059 goto done2; 1060 #endif 1061 1062 msghdr = NULL; 1063 while (msghdr == NULL) { 1064 if (msgtyp == 0) { 1065 msghdr = msqkptr->u.msg_first; 1066 if (msghdr != NULL) { 1067 if (msgsz < msghdr->msg_ts && 1068 (msgflg & MSG_NOERROR) == 0) { 1069 DPRINTF(("first message on the queue " 1070 "is too big (want %zu, got %d)\n", 1071 msgsz, msghdr->msg_ts)); 1072 error = E2BIG; 1073 goto done2; 1074 } 1075 #ifdef MAC 1076 error = mac_sysvmsq_check_msgrcv(td->td_ucred, 1077 msghdr); 1078 if (error != 0) 1079 goto done2; 1080 #endif 1081 if (msqkptr->u.msg_first == msqkptr->u.msg_last) { 1082 msqkptr->u.msg_first = NULL; 1083 msqkptr->u.msg_last = NULL; 1084 } else { 1085 msqkptr->u.msg_first = msghdr->msg_next; 1086 if (msqkptr->u.msg_first == NULL) 1087 panic("msg_first/last screwed up #1"); 1088 } 1089 } 1090 } else { 1091 struct msg *previous; 1092 struct msg **prev; 1093 1094 previous = NULL; 1095 prev = &(msqkptr->u.msg_first); 1096 while ((msghdr = *prev) != NULL) { 1097 /* 1098 * Is this message's type an exact match or is 1099 * this message's type less than or equal to 1100 * the absolute value of a negative msgtyp? 1101 * Note that the second half of this test can 1102 * NEVER be true if msgtyp is positive since 1103 * msg_type is always positive! 1104 */ 1105 1106 if (msgtyp == msghdr->msg_type || 1107 msghdr->msg_type <= -msgtyp) { 1108 DPRINTF(("found message type %ld, " 1109 "requested %ld\n", 1110 msghdr->msg_type, msgtyp)); 1111 if (msgsz < msghdr->msg_ts && 1112 (msgflg & MSG_NOERROR) == 0) { 1113 DPRINTF(("requested message " 1114 "on the queue is too big " 1115 "(want %zu, got %hu)\n", 1116 msgsz, msghdr->msg_ts)); 1117 error = E2BIG; 1118 goto done2; 1119 } 1120 #ifdef MAC 1121 error = mac_sysvmsq_check_msgrcv( 1122 td->td_ucred, msghdr); 1123 if (error != 0) 1124 goto done2; 1125 #endif 1126 *prev = msghdr->msg_next; 1127 if (msghdr == msqkptr->u.msg_last) { 1128 if (previous == NULL) { 1129 if (prev != 1130 &msqkptr->u.msg_first) 1131 panic("msg_first/last screwed up #2"); 1132 msqkptr->u.msg_first = 1133 NULL; 1134 msqkptr->u.msg_last = 1135 NULL; 1136 } else { 1137 if (prev == 1138 &msqkptr->u.msg_first) 1139 panic("msg_first/last screwed up #3"); 1140 msqkptr->u.msg_last = 1141 previous; 1142 } 1143 } 1144 break; 1145 } 1146 previous = msghdr; 1147 prev = &(msghdr->msg_next); 1148 } 1149 } 1150 1151 /* 1152 * We've either extracted the msghdr for the appropriate 1153 * message or there isn't one. 1154 * If there is one then bail out of this loop. 1155 */ 1156 1157 if (msghdr != NULL) 1158 break; 1159 1160 /* 1161 * Hmph! No message found. Does the user want to wait? 1162 */ 1163 1164 if ((msgflg & IPC_NOWAIT) != 0) { 1165 DPRINTF(("no appropriate message found (msgtyp=%ld)\n", 1166 msgtyp)); 1167 /* The SVID says to return ENOMSG. */ 1168 error = ENOMSG; 1169 goto done2; 1170 } 1171 1172 /* 1173 * Wait for something to happen 1174 */ 1175 1176 DPRINTF(("msgrcv: goodnight\n")); 1177 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 1178 "msgrcv", 0); 1179 DPRINTF(("msgrcv: good morning (error=%d)\n", error)); 1180 1181 if (error != 0) { 1182 DPRINTF(("msgrcv: interrupted system call\n")); 1183 error = EINTR; 1184 goto done2; 1185 } 1186 1187 /* 1188 * Make sure that the msq queue still exists 1189 */ 1190 1191 if (msqkptr->u.msg_qbytes == 0 || 1192 msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1193 DPRINTF(("msqid deleted\n")); 1194 error = EIDRM; 1195 goto done2; 1196 } 1197 } 1198 1199 /* 1200 * Return the message to the user. 1201 * 1202 * First, do the bookkeeping (before we risk being interrupted). 1203 */ 1204 1205 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 1206 msqkptr->u.msg_qnum--; 1207 msqkptr->u.msg_lrpid = td->td_proc->p_pid; 1208 msqkptr->u.msg_rtime = time_second; 1209 1210 /* 1211 * Make msgsz the actual amount that we'll be returning. 1212 * Note that this effectively truncates the message if it is too long 1213 * (since msgsz is never increased). 1214 */ 1215 1216 DPRINTF(("found a message, msgsz=%zu, msg_ts=%hu\n", msgsz, 1217 msghdr->msg_ts)); 1218 if (msgsz > msghdr->msg_ts) 1219 msgsz = msghdr->msg_ts; 1220 *mtype = msghdr->msg_type; 1221 1222 /* 1223 * Return the segments to the user 1224 */ 1225 1226 next = msghdr->msg_spot; 1227 for (len = 0; len < msgsz; len += msginfo.msgssz) { 1228 size_t tlen; 1229 1230 if (msgsz - len > msginfo.msgssz) 1231 tlen = msginfo.msgssz; 1232 else 1233 tlen = msgsz - len; 1234 if (next <= -1) 1235 panic("next too low #3"); 1236 if (next >= msginfo.msgseg) 1237 panic("next out of range #3"); 1238 mtx_unlock(&msq_mtx); 1239 error = copyout(&msgpool[next * msginfo.msgssz], msgp, tlen); 1240 mtx_lock(&msq_mtx); 1241 if (error != 0) { 1242 DPRINTF(("error (%d) copying out message segment\n", 1243 error)); 1244 msg_freehdr(msghdr); 1245 wakeup(msqkptr); 1246 goto done2; 1247 } 1248 msgp = (char *)msgp + tlen; 1249 next = msgmaps[next].next; 1250 } 1251 1252 /* 1253 * Done, return the actual number of bytes copied out. 1254 */ 1255 1256 msg_freehdr(msghdr); 1257 wakeup(msqkptr); 1258 td->td_retval[0] = msgsz; 1259 done2: 1260 mtx_unlock(&msq_mtx); 1261 return (error); 1262 } 1263 1264 int 1265 msgrcv(td, uap) 1266 struct thread *td; 1267 register struct msgrcv_args *uap; 1268 { 1269 int error; 1270 long mtype; 1271 1272 DPRINTF(("call to msgrcv(%d, %p, %zu, %ld, %d)\n", uap->msqid, 1273 uap->msgp, uap->msgsz, uap->msgtyp, uap->msgflg)); 1274 1275 if ((error = kern_msgrcv(td, uap->msqid, 1276 (char *)uap->msgp + sizeof(mtype), uap->msgsz, 1277 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1278 return (error); 1279 if ((error = copyout(&mtype, uap->msgp, sizeof(mtype))) != 0) 1280 DPRINTF(("error %d copying the message type\n", error)); 1281 return (error); 1282 } 1283 1284 static int 1285 sysctl_msqids(SYSCTL_HANDLER_ARGS) 1286 { 1287 1288 return (SYSCTL_OUT(req, msqids, 1289 sizeof(struct msqid_kernel) * msginfo.msgmni)); 1290 } 1291 1292 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmax, CTLFLAG_RD, &msginfo.msgmax, 0, 1293 "Maximum message size"); 1294 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmni, CTLFLAG_RDTUN, &msginfo.msgmni, 0, 1295 "Number of message queue identifiers"); 1296 SYSCTL_INT(_kern_ipc, OID_AUTO, msgmnb, CTLFLAG_RDTUN, &msginfo.msgmnb, 0, 1297 "Maximum number of bytes in a queue"); 1298 SYSCTL_INT(_kern_ipc, OID_AUTO, msgtql, CTLFLAG_RDTUN, &msginfo.msgtql, 0, 1299 "Maximum number of messages in the system"); 1300 SYSCTL_INT(_kern_ipc, OID_AUTO, msgssz, CTLFLAG_RDTUN, &msginfo.msgssz, 0, 1301 "Size of a message segment"); 1302 SYSCTL_INT(_kern_ipc, OID_AUTO, msgseg, CTLFLAG_RDTUN, &msginfo.msgseg, 0, 1303 "Number of message segments"); 1304 SYSCTL_PROC(_kern_ipc, OID_AUTO, msqids, CTLFLAG_RD, 1305 NULL, 0, sysctl_msqids, "", "Message queue IDs"); 1306 1307 #ifdef COMPAT_FREEBSD32 1308 int 1309 freebsd32_msgsys(struct thread *td, struct freebsd32_msgsys_args *uap) 1310 { 1311 1312 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1313 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1314 switch (uap->which) { 1315 case 0: 1316 return (freebsd7_freebsd32_msgctl(td, 1317 (struct freebsd7_freebsd32_msgctl_args *)&uap->a2)); 1318 case 2: 1319 return (freebsd32_msgsnd(td, 1320 (struct freebsd32_msgsnd_args *)&uap->a2)); 1321 case 3: 1322 return (freebsd32_msgrcv(td, 1323 (struct freebsd32_msgrcv_args *)&uap->a2)); 1324 default: 1325 return (msgsys(td, (struct msgsys_args *)uap)); 1326 } 1327 #else 1328 return (nosys(td, NULL)); 1329 #endif 1330 } 1331 1332 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1333 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1334 int 1335 freebsd7_freebsd32_msgctl(struct thread *td, 1336 struct freebsd7_freebsd32_msgctl_args *uap) 1337 { 1338 struct msqid_ds msqbuf; 1339 struct msqid_ds32_old msqbuf32; 1340 int error; 1341 1342 if (uap->cmd == IPC_SET) { 1343 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1344 if (error) 1345 return (error); 1346 freebsd32_ipcperm_old_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1347 PTRIN_CP(msqbuf32, msqbuf, msg_first); 1348 PTRIN_CP(msqbuf32, msqbuf, msg_last); 1349 CP(msqbuf32, msqbuf, msg_cbytes); 1350 CP(msqbuf32, msqbuf, msg_qnum); 1351 CP(msqbuf32, msqbuf, msg_qbytes); 1352 CP(msqbuf32, msqbuf, msg_lspid); 1353 CP(msqbuf32, msqbuf, msg_lrpid); 1354 CP(msqbuf32, msqbuf, msg_stime); 1355 CP(msqbuf32, msqbuf, msg_rtime); 1356 CP(msqbuf32, msqbuf, msg_ctime); 1357 } 1358 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1359 if (error) 1360 return (error); 1361 if (uap->cmd == IPC_STAT) { 1362 bzero(&msqbuf32, sizeof(msqbuf32)); 1363 freebsd32_ipcperm_old_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1364 PTROUT_CP(msqbuf, msqbuf32, msg_first); 1365 PTROUT_CP(msqbuf, msqbuf32, msg_last); 1366 CP(msqbuf, msqbuf32, msg_cbytes); 1367 CP(msqbuf, msqbuf32, msg_qnum); 1368 CP(msqbuf, msqbuf32, msg_qbytes); 1369 CP(msqbuf, msqbuf32, msg_lspid); 1370 CP(msqbuf, msqbuf32, msg_lrpid); 1371 CP(msqbuf, msqbuf32, msg_stime); 1372 CP(msqbuf, msqbuf32, msg_rtime); 1373 CP(msqbuf, msqbuf32, msg_ctime); 1374 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1375 } 1376 return (error); 1377 } 1378 #endif 1379 1380 int 1381 freebsd32_msgctl(struct thread *td, struct freebsd32_msgctl_args *uap) 1382 { 1383 struct msqid_ds msqbuf; 1384 struct msqid_ds32 msqbuf32; 1385 int error; 1386 1387 if (uap->cmd == IPC_SET) { 1388 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1389 if (error) 1390 return (error); 1391 freebsd32_ipcperm_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1392 PTRIN_CP(msqbuf32, msqbuf, msg_first); 1393 PTRIN_CP(msqbuf32, msqbuf, msg_last); 1394 CP(msqbuf32, msqbuf, msg_cbytes); 1395 CP(msqbuf32, msqbuf, msg_qnum); 1396 CP(msqbuf32, msqbuf, msg_qbytes); 1397 CP(msqbuf32, msqbuf, msg_lspid); 1398 CP(msqbuf32, msqbuf, msg_lrpid); 1399 CP(msqbuf32, msqbuf, msg_stime); 1400 CP(msqbuf32, msqbuf, msg_rtime); 1401 CP(msqbuf32, msqbuf, msg_ctime); 1402 } 1403 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1404 if (error) 1405 return (error); 1406 if (uap->cmd == IPC_STAT) { 1407 freebsd32_ipcperm_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1408 PTROUT_CP(msqbuf, msqbuf32, msg_first); 1409 PTROUT_CP(msqbuf, msqbuf32, msg_last); 1410 CP(msqbuf, msqbuf32, msg_cbytes); 1411 CP(msqbuf, msqbuf32, msg_qnum); 1412 CP(msqbuf, msqbuf32, msg_qbytes); 1413 CP(msqbuf, msqbuf32, msg_lspid); 1414 CP(msqbuf, msqbuf32, msg_lrpid); 1415 CP(msqbuf, msqbuf32, msg_stime); 1416 CP(msqbuf, msqbuf32, msg_rtime); 1417 CP(msqbuf, msqbuf32, msg_ctime); 1418 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1419 } 1420 return (error); 1421 } 1422 1423 int 1424 freebsd32_msgsnd(struct thread *td, struct freebsd32_msgsnd_args *uap) 1425 { 1426 const void *msgp; 1427 long mtype; 1428 int32_t mtype32; 1429 int error; 1430 1431 msgp = PTRIN(uap->msgp); 1432 if ((error = copyin(msgp, &mtype32, sizeof(mtype32))) != 0) 1433 return (error); 1434 mtype = mtype32; 1435 return (kern_msgsnd(td, uap->msqid, 1436 (const char *)msgp + sizeof(mtype32), 1437 uap->msgsz, uap->msgflg, mtype)); 1438 } 1439 1440 int 1441 freebsd32_msgrcv(struct thread *td, struct freebsd32_msgrcv_args *uap) 1442 { 1443 void *msgp; 1444 long mtype; 1445 int32_t mtype32; 1446 int error; 1447 1448 msgp = PTRIN(uap->msgp); 1449 if ((error = kern_msgrcv(td, uap->msqid, 1450 (char *)msgp + sizeof(mtype32), uap->msgsz, 1451 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1452 return (error); 1453 mtype32 = (int32_t)mtype; 1454 return (copyout(&mtype32, msgp, sizeof(mtype32))); 1455 } 1456 #endif 1457 1458 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1459 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1460 1461 /* XXX casting to (sy_call_t *) is bogus, as usual. */ 1462 static sy_call_t *msgcalls[] = { 1463 (sy_call_t *)freebsd7_msgctl, (sy_call_t *)msgget, 1464 (sy_call_t *)msgsnd, (sy_call_t *)msgrcv 1465 }; 1466 1467 /* 1468 * Entry point for all MSG calls. 1469 */ 1470 int 1471 msgsys(td, uap) 1472 struct thread *td; 1473 /* XXX actually varargs. */ 1474 struct msgsys_args /* { 1475 int which; 1476 int a2; 1477 int a3; 1478 int a4; 1479 int a5; 1480 int a6; 1481 } */ *uap; 1482 { 1483 int error; 1484 1485 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 1486 return (ENOSYS); 1487 if (uap->which < 0 || 1488 uap->which >= sizeof(msgcalls)/sizeof(msgcalls[0])) 1489 return (EINVAL); 1490 error = (*msgcalls[uap->which])(td, &uap->a2); 1491 return (error); 1492 } 1493 1494 #ifndef CP 1495 #define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0) 1496 #endif 1497 1498 #ifndef _SYS_SYSPROTO_H_ 1499 struct freebsd7_msgctl_args { 1500 int msqid; 1501 int cmd; 1502 struct msqid_ds_old *buf; 1503 }; 1504 #endif 1505 int 1506 freebsd7_msgctl(td, uap) 1507 struct thread *td; 1508 struct freebsd7_msgctl_args *uap; 1509 { 1510 struct msqid_ds_old msqold; 1511 struct msqid_ds msqbuf; 1512 int error; 1513 1514 DPRINTF(("call to freebsd7_msgctl(%d, %d, %p)\n", uap->msqid, uap->cmd, 1515 uap->buf)); 1516 if (uap->cmd == IPC_SET) { 1517 error = copyin(uap->buf, &msqold, sizeof(msqold)); 1518 if (error) 1519 return (error); 1520 ipcperm_old2new(&msqold.msg_perm, &msqbuf.msg_perm); 1521 CP(msqold, msqbuf, msg_first); 1522 CP(msqold, msqbuf, msg_last); 1523 CP(msqold, msqbuf, msg_cbytes); 1524 CP(msqold, msqbuf, msg_qnum); 1525 CP(msqold, msqbuf, msg_qbytes); 1526 CP(msqold, msqbuf, msg_lspid); 1527 CP(msqold, msqbuf, msg_lrpid); 1528 CP(msqold, msqbuf, msg_stime); 1529 CP(msqold, msqbuf, msg_rtime); 1530 CP(msqold, msqbuf, msg_ctime); 1531 } 1532 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1533 if (error) 1534 return (error); 1535 if (uap->cmd == IPC_STAT) { 1536 bzero(&msqold, sizeof(msqold)); 1537 ipcperm_new2old(&msqbuf.msg_perm, &msqold.msg_perm); 1538 CP(msqbuf, msqold, msg_first); 1539 CP(msqbuf, msqold, msg_last); 1540 CP(msqbuf, msqold, msg_cbytes); 1541 CP(msqbuf, msqold, msg_qnum); 1542 CP(msqbuf, msqold, msg_qbytes); 1543 CP(msqbuf, msqold, msg_lspid); 1544 CP(msqbuf, msqold, msg_lrpid); 1545 CP(msqbuf, msqold, msg_stime); 1546 CP(msqbuf, msqold, msg_rtime); 1547 CP(msqbuf, msqold, msg_ctime); 1548 error = copyout(&msqold, uap->buf, sizeof(struct msqid_ds_old)); 1549 } 1550 return (error); 1551 } 1552 1553 #undef CP 1554 1555 #endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 || 1556 COMPAT_FREEBSD7 */
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