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/10.2/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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