sysv_msg.c revision 219028
1231990Smp/*- 2155832Sume * Implementation of SVID messages 3231990Smp * 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: head/sys/kern/sysv_msg.c 219028 2011-02-25 10:11:01Z netchild $"); 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 75FEATURE(sysv_msg, "System V message queues support"); 76 77static MALLOC_DEFINE(M_MSG, "msg", "SVID compatible message queues"); 78 79static int msginit(void); 80static int msgunload(void); 81static int sysvmsg_modload(struct module *, int, void *); 82 83#ifdef MSG_DEBUG 84#define DPRINTF(a) printf a 85#else 86#define DPRINTF(a) (void)0 87#endif 88 89static void msg_freehdr(struct msg *msghdr); 90 91#ifndef MSGSSZ 92#define MSGSSZ 8 /* Each segment must be 2^N long */ 93#endif 94#ifndef MSGSEG 95#define MSGSEG 2048 /* must be less than 32767 */ 96#endif 97#define MSGMAX (MSGSSZ*MSGSEG) 98#ifndef MSGMNB 99#define MSGMNB 2048 /* max # of bytes in a queue */ 100#endif 101#ifndef MSGMNI 102#define MSGMNI 40 103#endif 104#ifndef MSGTQL 105#define MSGTQL 40 106#endif 107 108/* 109 * Based on the configuration parameters described in an SVR2 (yes, two) 110 * config(1m) man page. 111 * 112 * Each message is broken up and stored in segments that are msgssz bytes 113 * long. For efficiency reasons, this should be a power of two. Also, 114 * it doesn't make sense if it is less than 8 or greater than about 256. 115 * Consequently, msginit in kern/sysv_msg.c checks that msgssz is a power of 116 * two between 8 and 1024 inclusive (and panic's if it isn't). 117 */ 118struct msginfo msginfo = { 119 MSGMAX, /* max chars in a message */ 120 MSGMNI, /* # of message queue identifiers */ 121 MSGMNB, /* max chars in a queue */ 122 MSGTQL, /* max messages in system */ 123 MSGSSZ, /* size of a message segment */ 124 /* (must be small power of 2 greater than 4) */ 125 MSGSEG /* number of message segments */ 126}; 127 128/* 129 * macros to convert between msqid_ds's and msqid's. 130 * (specific to this implementation) 131 */ 132#define MSQID(ix,ds) ((ix) & 0xffff | (((ds).msg_perm.seq << 16) & 0xffff0000)) 133#define MSQID_IX(id) ((id) & 0xffff) 134#define MSQID_SEQ(id) (((id) >> 16) & 0xffff) 135 136/* 137 * The rest of this file is specific to this particular implementation. 138 */ 139 140struct msgmap { 141 short next; /* next segment in buffer */ 142 /* -1 -> available */ 143 /* 0..(MSGSEG-1) -> index of next segment */ 144}; 145 146#define MSG_LOCKED 01000 /* Is this msqid_ds locked? */ 147 148static int nfree_msgmaps; /* # of free map entries */ 149static short free_msgmaps; /* head of linked list of free map entries */ 150static struct msg *free_msghdrs;/* list of free msg headers */ 151static char *msgpool; /* MSGMAX byte long msg buffer pool */ 152static struct msgmap *msgmaps; /* MSGSEG msgmap structures */ 153static struct msg *msghdrs; /* MSGTQL msg headers */ 154static struct msqid_kernel *msqids; /* MSGMNI msqid_kernel struct's */ 155static struct mtx msq_mtx; /* global mutex for message queues. */ 156 157static struct syscall_helper_data msg_syscalls[] = { 158 SYSCALL_INIT_HELPER(msgctl), 159 SYSCALL_INIT_HELPER(msgget), 160 SYSCALL_INIT_HELPER(msgsnd), 161 SYSCALL_INIT_HELPER(msgrcv), 162#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 163 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 164 SYSCALL_INIT_HELPER(msgsys), 165 SYSCALL_INIT_HELPER(freebsd7_msgctl), 166#endif 167 SYSCALL_INIT_LAST 168}; 169 170#ifdef COMPAT_FREEBSD32 171#include <compat/freebsd32/freebsd32.h> 172#include <compat/freebsd32/freebsd32_ipc.h> 173#include <compat/freebsd32/freebsd32_proto.h> 174#include <compat/freebsd32/freebsd32_signal.h> 175#include <compat/freebsd32/freebsd32_syscall.h> 176#include <compat/freebsd32/freebsd32_util.h> 177 178static struct syscall_helper_data msg32_syscalls[] = { 179 SYSCALL32_INIT_HELPER(freebsd32_msgctl), 180 SYSCALL32_INIT_HELPER(freebsd32_msgsnd), 181 SYSCALL32_INIT_HELPER(freebsd32_msgrcv), 182 SYSCALL32_INIT_HELPER(msgget), 183 SYSCALL32_INIT_HELPER(freebsd32_msgsys), 184#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 185 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 186 SYSCALL32_INIT_HELPER(freebsd7_freebsd32_msgctl), 187#endif 188 SYSCALL_INIT_LAST 189}; 190#endif 191 192static int 193msginit() 194{ 195 int i, error; 196 197 TUNABLE_INT_FETCH("kern.ipc.msgseg", &msginfo.msgseg); 198 TUNABLE_INT_FETCH("kern.ipc.msgssz", &msginfo.msgssz); 199 msginfo.msgmax = msginfo.msgseg * msginfo.msgssz; 200 TUNABLE_INT_FETCH("kern.ipc.msgmni", &msginfo.msgmni); 201 TUNABLE_INT_FETCH("kern.ipc.msgmnb", &msginfo.msgmnb); 202 TUNABLE_INT_FETCH("kern.ipc.msgtql", &msginfo.msgtql); 203 204 msgpool = malloc(msginfo.msgmax, M_MSG, M_WAITOK); 205 msgmaps = malloc(sizeof(struct msgmap) * msginfo.msgseg, M_MSG, M_WAITOK); 206 msghdrs = malloc(sizeof(struct msg) * msginfo.msgtql, M_MSG, M_WAITOK); 207 msqids = malloc(sizeof(struct msqid_kernel) * msginfo.msgmni, M_MSG, 208 M_WAITOK); 209 210 /* 211 * msginfo.msgssz should be a power of two for efficiency reasons. 212 * It is also pretty silly if msginfo.msgssz is less than 8 213 * or greater than about 256 so ... 214 */ 215 216 i = 8; 217 while (i < 1024 && i != msginfo.msgssz) 218 i <<= 1; 219 if (i != msginfo.msgssz) { 220 DPRINTF(("msginfo.msgssz=%d (0x%x)\n", msginfo.msgssz, 221 msginfo.msgssz)); 222 panic("msginfo.msgssz not a small power of 2"); 223 } 224 225 if (msginfo.msgseg > 32767) { 226 DPRINTF(("msginfo.msgseg=%d\n", msginfo.msgseg)); 227 panic("msginfo.msgseg > 32767"); 228 } 229 230 for (i = 0; i < msginfo.msgseg; i++) { 231 if (i > 0) 232 msgmaps[i-1].next = i; 233 msgmaps[i].next = -1; /* implies entry is available */ 234 } 235 free_msgmaps = 0; 236 nfree_msgmaps = msginfo.msgseg; 237 238 for (i = 0; i < msginfo.msgtql; i++) { 239 msghdrs[i].msg_type = 0; 240 if (i > 0) 241 msghdrs[i-1].msg_next = &msghdrs[i]; 242 msghdrs[i].msg_next = NULL; 243#ifdef MAC 244 mac_sysvmsg_init(&msghdrs[i]); 245#endif 246 } 247 free_msghdrs = &msghdrs[0]; 248 249 for (i = 0; i < msginfo.msgmni; i++) { 250 msqids[i].u.msg_qbytes = 0; /* implies entry is available */ 251 msqids[i].u.msg_perm.seq = 0; /* reset to a known value */ 252 msqids[i].u.msg_perm.mode = 0; 253#ifdef MAC 254 mac_sysvmsq_init(&msqids[i]); 255#endif 256 } 257 mtx_init(&msq_mtx, "msq", NULL, MTX_DEF); 258 259 error = syscall_helper_register(msg_syscalls); 260 if (error != 0) 261 return (error); 262#ifdef COMPAT_FREEBSD32 263 error = syscall32_helper_register(msg32_syscalls); 264 if (error != 0) 265 return (error); 266#endif 267 return (0); 268} 269 270static int 271msgunload() 272{ 273 struct msqid_kernel *msqkptr; 274 int msqid; 275#ifdef MAC 276 int i; 277#endif 278 279 syscall_helper_unregister(msg_syscalls); 280#ifdef COMPAT_FREEBSD32 281 syscall32_helper_unregister(msg32_syscalls); 282#endif 283 284 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 285 /* 286 * Look for an unallocated and unlocked msqid_ds. 287 * msqid_ds's can be locked by msgsnd or msgrcv while 288 * they are copying the message in/out. We can't 289 * re-use the entry until they release it. 290 */ 291 msqkptr = &msqids[msqid]; 292 if (msqkptr->u.msg_qbytes != 0 || 293 (msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 294 break; 295 } 296 if (msqid != msginfo.msgmni) 297 return (EBUSY); 298 299#ifdef MAC 300 for (i = 0; i < msginfo.msgtql; i++) 301 mac_sysvmsg_destroy(&msghdrs[i]); 302 for (msqid = 0; msqid < msginfo.msgmni; msqid++) 303 mac_sysvmsq_destroy(&msqids[msqid]); 304#endif 305 free(msgpool, M_MSG); 306 free(msgmaps, M_MSG); 307 free(msghdrs, M_MSG); 308 free(msqids, M_MSG); 309 mtx_destroy(&msq_mtx); 310 return (0); 311} 312 313 314static int 315sysvmsg_modload(struct module *module, int cmd, void *arg) 316{ 317 int error = 0; 318 319 switch (cmd) { 320 case MOD_LOAD: 321 error = msginit(); 322 if (error != 0) 323 msgunload(); 324 break; 325 case MOD_UNLOAD: 326 error = msgunload(); 327 break; 328 case MOD_SHUTDOWN: 329 break; 330 default: 331 error = EINVAL; 332 break; 333 } 334 return (error); 335} 336 337static moduledata_t sysvmsg_mod = { 338 "sysvmsg", 339 &sysvmsg_modload, 340 NULL 341}; 342 343DECLARE_MODULE(sysvmsg, sysvmsg_mod, SI_SUB_SYSV_MSG, SI_ORDER_FIRST); 344MODULE_VERSION(sysvmsg, 1); 345 346static void 347msg_freehdr(msghdr) 348 struct msg *msghdr; 349{ 350 while (msghdr->msg_ts > 0) { 351 short next; 352 if (msghdr->msg_spot < 0 || msghdr->msg_spot >= msginfo.msgseg) 353 panic("msghdr->msg_spot out of range"); 354 next = msgmaps[msghdr->msg_spot].next; 355 msgmaps[msghdr->msg_spot].next = free_msgmaps; 356 free_msgmaps = msghdr->msg_spot; 357 nfree_msgmaps++; 358 msghdr->msg_spot = next; 359 if (msghdr->msg_ts >= msginfo.msgssz) 360 msghdr->msg_ts -= msginfo.msgssz; 361 else 362 msghdr->msg_ts = 0; 363 } 364 if (msghdr->msg_spot != -1) 365 panic("msghdr->msg_spot != -1"); 366 msghdr->msg_next = free_msghdrs; 367 free_msghdrs = msghdr; 368#ifdef MAC 369 mac_sysvmsg_cleanup(msghdr); 370#endif 371} 372 373#ifndef _SYS_SYSPROTO_H_ 374struct msgctl_args { 375 int msqid; 376 int cmd; 377 struct msqid_ds *buf; 378}; 379#endif 380int 381msgctl(td, uap) 382 struct thread *td; 383 register struct msgctl_args *uap; 384{ 385 int msqid = uap->msqid; 386 int cmd = uap->cmd; 387 struct msqid_ds msqbuf; 388 int error; 389 390 DPRINTF(("call to msgctl(%d, %d, %p)\n", msqid, cmd, uap->buf)); 391 if (cmd == IPC_SET && 392 (error = copyin(uap->buf, &msqbuf, sizeof(msqbuf))) != 0) 393 return (error); 394 error = kern_msgctl(td, msqid, cmd, &msqbuf); 395 if (cmd == IPC_STAT && error == 0) 396 error = copyout(&msqbuf, uap->buf, sizeof(struct msqid_ds)); 397 return (error); 398} 399 400int 401kern_msgctl(td, msqid, cmd, msqbuf) 402 struct thread *td; 403 int msqid; 404 int cmd; 405 struct msqid_ds *msqbuf; 406{ 407 int rval, error, msqix; 408 register struct msqid_kernel *msqkptr; 409 410 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 411 return (ENOSYS); 412 413 msqix = IPCID_TO_IX(msqid); 414 415 if (msqix < 0 || msqix >= msginfo.msgmni) { 416 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 417 msginfo.msgmni)); 418 return (EINVAL); 419 } 420 421 msqkptr = &msqids[msqix]; 422 423 mtx_lock(&msq_mtx); 424 if (msqkptr->u.msg_qbytes == 0) { 425 DPRINTF(("no such msqid\n")); 426 error = EINVAL; 427 goto done2; 428 } 429 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 430 DPRINTF(("wrong sequence number\n")); 431 error = EINVAL; 432 goto done2; 433 } 434#ifdef MAC 435 error = mac_sysvmsq_check_msqctl(td->td_ucred, msqkptr, cmd); 436 if (error != 0) 437 goto done2; 438#endif 439 440 error = 0; 441 rval = 0; 442 443 switch (cmd) { 444 445 case IPC_RMID: 446 { 447 struct msg *msghdr; 448 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 449 goto done2; 450 451#ifdef MAC 452 /* 453 * Check that the thread has MAC access permissions to 454 * individual msghdrs. Note: We need to do this in a 455 * separate loop because the actual loop alters the 456 * msq/msghdr info as it progresses, and there is no going 457 * back if half the way through we discover that the 458 * thread cannot free a certain msghdr. The msq will get 459 * into an inconsistent state. 460 */ 461 for (msghdr = msqkptr->u.msg_first; msghdr != NULL; 462 msghdr = msghdr->msg_next) { 463 error = mac_sysvmsq_check_msgrmid(td->td_ucred, msghdr); 464 if (error != 0) 465 goto done2; 466 } 467#endif 468 469 /* Free the message headers */ 470 msghdr = msqkptr->u.msg_first; 471 while (msghdr != NULL) { 472 struct msg *msghdr_tmp; 473 474 /* Free the segments of each message */ 475 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 476 msqkptr->u.msg_qnum--; 477 msghdr_tmp = msghdr; 478 msghdr = msghdr->msg_next; 479 msg_freehdr(msghdr_tmp); 480 } 481 482 if (msqkptr->u.msg_cbytes != 0) 483 panic("msg_cbytes is screwed up"); 484 if (msqkptr->u.msg_qnum != 0) 485 panic("msg_qnum is screwed up"); 486 487 msqkptr->u.msg_qbytes = 0; /* Mark it as free */ 488 489#ifdef MAC 490 mac_sysvmsq_cleanup(msqkptr); 491#endif 492 493 wakeup(msqkptr); 494 } 495 496 break; 497 498 case IPC_SET: 499 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_M))) 500 goto done2; 501 if (msqbuf->msg_qbytes > msqkptr->u.msg_qbytes) { 502 error = priv_check(td, PRIV_IPC_MSGSIZE); 503 if (error) 504 goto done2; 505 } 506 if (msqbuf->msg_qbytes > msginfo.msgmnb) { 507 DPRINTF(("can't increase msg_qbytes beyond %d" 508 "(truncating)\n", msginfo.msgmnb)); 509 msqbuf->msg_qbytes = msginfo.msgmnb; /* silently restrict qbytes to system limit */ 510 } 511 if (msqbuf->msg_qbytes == 0) { 512 DPRINTF(("can't reduce msg_qbytes to 0\n")); 513 error = EINVAL; /* non-standard errno! */ 514 goto done2; 515 } 516 msqkptr->u.msg_perm.uid = msqbuf->msg_perm.uid; /* change the owner */ 517 msqkptr->u.msg_perm.gid = msqbuf->msg_perm.gid; /* change the owner */ 518 msqkptr->u.msg_perm.mode = (msqkptr->u.msg_perm.mode & ~0777) | 519 (msqbuf->msg_perm.mode & 0777); 520 msqkptr->u.msg_qbytes = msqbuf->msg_qbytes; 521 msqkptr->u.msg_ctime = time_second; 522 break; 523 524 case IPC_STAT: 525 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 526 DPRINTF(("requester doesn't have read access\n")); 527 goto done2; 528 } 529 *msqbuf = msqkptr->u; 530 break; 531 532 default: 533 DPRINTF(("invalid command %d\n", cmd)); 534 error = EINVAL; 535 goto done2; 536 } 537 538 if (error == 0) 539 td->td_retval[0] = rval; 540done2: 541 mtx_unlock(&msq_mtx); 542 return (error); 543} 544 545#ifndef _SYS_SYSPROTO_H_ 546struct msgget_args { 547 key_t key; 548 int msgflg; 549}; 550#endif 551int 552msgget(td, uap) 553 struct thread *td; 554 register struct msgget_args *uap; 555{ 556 int msqid, error = 0; 557 int key = uap->key; 558 int msgflg = uap->msgflg; 559 struct ucred *cred = td->td_ucred; 560 register struct msqid_kernel *msqkptr = NULL; 561 562 DPRINTF(("msgget(0x%x, 0%o)\n", key, msgflg)); 563 564 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 565 return (ENOSYS); 566 567 mtx_lock(&msq_mtx); 568 if (key != IPC_PRIVATE) { 569 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 570 msqkptr = &msqids[msqid]; 571 if (msqkptr->u.msg_qbytes != 0 && 572 msqkptr->u.msg_perm.key == key) 573 break; 574 } 575 if (msqid < msginfo.msgmni) { 576 DPRINTF(("found public key\n")); 577 if ((msgflg & IPC_CREAT) && (msgflg & IPC_EXCL)) { 578 DPRINTF(("not exclusive\n")); 579 error = EEXIST; 580 goto done2; 581 } 582 if ((error = ipcperm(td, &msqkptr->u.msg_perm, 583 msgflg & 0700))) { 584 DPRINTF(("requester doesn't have 0%o access\n", 585 msgflg & 0700)); 586 goto done2; 587 } 588#ifdef MAC 589 error = mac_sysvmsq_check_msqget(cred, msqkptr); 590 if (error != 0) 591 goto done2; 592#endif 593 goto found; 594 } 595 } 596 597 DPRINTF(("need to allocate the msqid_ds\n")); 598 if (key == IPC_PRIVATE || (msgflg & IPC_CREAT)) { 599 for (msqid = 0; msqid < msginfo.msgmni; msqid++) { 600 /* 601 * Look for an unallocated and unlocked msqid_ds. 602 * msqid_ds's can be locked by msgsnd or msgrcv while 603 * they are copying the message in/out. We can't 604 * re-use the entry until they release it. 605 */ 606 msqkptr = &msqids[msqid]; 607 if (msqkptr->u.msg_qbytes == 0 && 608 (msqkptr->u.msg_perm.mode & MSG_LOCKED) == 0) 609 break; 610 } 611 if (msqid == msginfo.msgmni) { 612 DPRINTF(("no more msqid_ds's available\n")); 613 error = ENOSPC; 614 goto done2; 615 } 616 DPRINTF(("msqid %d is available\n", msqid)); 617 msqkptr->u.msg_perm.key = key; 618 msqkptr->u.msg_perm.cuid = cred->cr_uid; 619 msqkptr->u.msg_perm.uid = cred->cr_uid; 620 msqkptr->u.msg_perm.cgid = cred->cr_gid; 621 msqkptr->u.msg_perm.gid = cred->cr_gid; 622 msqkptr->u.msg_perm.mode = (msgflg & 0777); 623 /* Make sure that the returned msqid is unique */ 624 msqkptr->u.msg_perm.seq = (msqkptr->u.msg_perm.seq + 1) & 0x7fff; 625 msqkptr->u.msg_first = NULL; 626 msqkptr->u.msg_last = NULL; 627 msqkptr->u.msg_cbytes = 0; 628 msqkptr->u.msg_qnum = 0; 629 msqkptr->u.msg_qbytes = msginfo.msgmnb; 630 msqkptr->u.msg_lspid = 0; 631 msqkptr->u.msg_lrpid = 0; 632 msqkptr->u.msg_stime = 0; 633 msqkptr->u.msg_rtime = 0; 634 msqkptr->u.msg_ctime = time_second; 635#ifdef MAC 636 mac_sysvmsq_create(cred, msqkptr); 637#endif 638 } else { 639 DPRINTF(("didn't find it and wasn't asked to create it\n")); 640 error = ENOENT; 641 goto done2; 642 } 643 644found: 645 /* Construct the unique msqid */ 646 td->td_retval[0] = IXSEQ_TO_IPCID(msqid, msqkptr->u.msg_perm); 647done2: 648 mtx_unlock(&msq_mtx); 649 return (error); 650} 651 652#ifndef _SYS_SYSPROTO_H_ 653struct msgsnd_args { 654 int msqid; 655 const void *msgp; 656 size_t msgsz; 657 int msgflg; 658}; 659#endif 660int 661kern_msgsnd(td, msqid, msgp, msgsz, msgflg, mtype) 662 struct thread *td; 663 int msqid; 664 const void *msgp; /* XXX msgp is actually mtext. */ 665 size_t msgsz; 666 int msgflg; 667 long mtype; 668{ 669 int msqix, segs_needed, error = 0; 670 register struct msqid_kernel *msqkptr; 671 register struct msg *msghdr; 672 short next; 673 674 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 675 return (ENOSYS); 676 677 mtx_lock(&msq_mtx); 678 msqix = IPCID_TO_IX(msqid); 679 680 if (msqix < 0 || msqix >= msginfo.msgmni) { 681 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 682 msginfo.msgmni)); 683 error = EINVAL; 684 goto done2; 685 } 686 687 msqkptr = &msqids[msqix]; 688 if (msqkptr->u.msg_qbytes == 0) { 689 DPRINTF(("no such message queue id\n")); 690 error = EINVAL; 691 goto done2; 692 } 693 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 694 DPRINTF(("wrong sequence number\n")); 695 error = EINVAL; 696 goto done2; 697 } 698 699 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_W))) { 700 DPRINTF(("requester doesn't have write access\n")); 701 goto done2; 702 } 703 704#ifdef MAC 705 error = mac_sysvmsq_check_msqsnd(td->td_ucred, msqkptr); 706 if (error != 0) 707 goto done2; 708#endif 709 710 segs_needed = (msgsz + msginfo.msgssz - 1) / msginfo.msgssz; 711 DPRINTF(("msgsz=%zu, msgssz=%d, segs_needed=%d\n", msgsz, 712 msginfo.msgssz, segs_needed)); 713 for (;;) { 714 int need_more_resources = 0; 715 716 /* 717 * check msgsz 718 * (inside this loop in case msg_qbytes changes while we sleep) 719 */ 720 721 if (msgsz > msqkptr->u.msg_qbytes) { 722 DPRINTF(("msgsz > msqkptr->u.msg_qbytes\n")); 723 error = EINVAL; 724 goto done2; 725 } 726 727 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) { 728 DPRINTF(("msqid is locked\n")); 729 need_more_resources = 1; 730 } 731 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) { 732 DPRINTF(("msgsz + msg_cbytes > msg_qbytes\n")); 733 need_more_resources = 1; 734 } 735 if (segs_needed > nfree_msgmaps) { 736 DPRINTF(("segs_needed > nfree_msgmaps\n")); 737 need_more_resources = 1; 738 } 739 if (free_msghdrs == NULL) { 740 DPRINTF(("no more msghdrs\n")); 741 need_more_resources = 1; 742 } 743 744 if (need_more_resources) { 745 int we_own_it; 746 747 if ((msgflg & IPC_NOWAIT) != 0) { 748 DPRINTF(("need more resources but caller " 749 "doesn't want to wait\n")); 750 error = EAGAIN; 751 goto done2; 752 } 753 754 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) { 755 DPRINTF(("we don't own the msqid_ds\n")); 756 we_own_it = 0; 757 } else { 758 /* Force later arrivals to wait for our 759 request */ 760 DPRINTF(("we own the msqid_ds\n")); 761 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 762 we_own_it = 1; 763 } 764 DPRINTF(("msgsnd: goodnight\n")); 765 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 766 "msgsnd", hz); 767 DPRINTF(("msgsnd: good morning, error=%d\n", error)); 768 if (we_own_it) 769 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 770 if (error == EWOULDBLOCK) { 771 DPRINTF(("msgsnd: timed out\n")); 772 continue; 773 } 774 if (error != 0) { 775 DPRINTF(("msgsnd: interrupted system call\n")); 776 error = EINTR; 777 goto done2; 778 } 779 780 /* 781 * Make sure that the msq queue still exists 782 */ 783 784 if (msqkptr->u.msg_qbytes == 0) { 785 DPRINTF(("msqid deleted\n")); 786 error = EIDRM; 787 goto done2; 788 } 789 790 } else { 791 DPRINTF(("got all the resources that we need\n")); 792 break; 793 } 794 } 795 796 /* 797 * We have the resources that we need. 798 * Make sure! 799 */ 800 801 if (msqkptr->u.msg_perm.mode & MSG_LOCKED) 802 panic("msg_perm.mode & MSG_LOCKED"); 803 if (segs_needed > nfree_msgmaps) 804 panic("segs_needed > nfree_msgmaps"); 805 if (msgsz + msqkptr->u.msg_cbytes > msqkptr->u.msg_qbytes) 806 panic("msgsz + msg_cbytes > msg_qbytes"); 807 if (free_msghdrs == NULL) 808 panic("no more msghdrs"); 809 810 /* 811 * Re-lock the msqid_ds in case we page-fault when copying in the 812 * message 813 */ 814 815 if ((msqkptr->u.msg_perm.mode & MSG_LOCKED) != 0) 816 panic("msqid_ds is already locked"); 817 msqkptr->u.msg_perm.mode |= MSG_LOCKED; 818 819 /* 820 * Allocate a message header 821 */ 822 823 msghdr = free_msghdrs; 824 free_msghdrs = msghdr->msg_next; 825 msghdr->msg_spot = -1; 826 msghdr->msg_ts = msgsz; 827 msghdr->msg_type = mtype; 828#ifdef MAC 829 /* 830 * XXXMAC: Should the mac_sysvmsq_check_msgmsq check follow here 831 * immediately? Or, should it be checked just before the msg is 832 * enqueued in the msgq (as it is done now)? 833 */ 834 mac_sysvmsg_create(td->td_ucred, msqkptr, msghdr); 835#endif 836 837 /* 838 * Allocate space for the message 839 */ 840 841 while (segs_needed > 0) { 842 if (nfree_msgmaps <= 0) 843 panic("not enough msgmaps"); 844 if (free_msgmaps == -1) 845 panic("nil free_msgmaps"); 846 next = free_msgmaps; 847 if (next <= -1) 848 panic("next too low #1"); 849 if (next >= msginfo.msgseg) 850 panic("next out of range #1"); 851 DPRINTF(("allocating segment %d to message\n", next)); 852 free_msgmaps = msgmaps[next].next; 853 nfree_msgmaps--; 854 msgmaps[next].next = msghdr->msg_spot; 855 msghdr->msg_spot = next; 856 segs_needed--; 857 } 858 859 /* 860 * Validate the message type 861 */ 862 863 if (msghdr->msg_type < 1) { 864 msg_freehdr(msghdr); 865 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 866 wakeup(msqkptr); 867 DPRINTF(("mtype (%ld) < 1\n", msghdr->msg_type)); 868 error = EINVAL; 869 goto done2; 870 } 871 872 /* 873 * Copy in the message body 874 */ 875 876 next = msghdr->msg_spot; 877 while (msgsz > 0) { 878 size_t tlen; 879 if (msgsz > msginfo.msgssz) 880 tlen = msginfo.msgssz; 881 else 882 tlen = msgsz; 883 if (next <= -1) 884 panic("next too low #2"); 885 if (next >= msginfo.msgseg) 886 panic("next out of range #2"); 887 mtx_unlock(&msq_mtx); 888 if ((error = copyin(msgp, &msgpool[next * msginfo.msgssz], 889 tlen)) != 0) { 890 mtx_lock(&msq_mtx); 891 DPRINTF(("error %d copying in message segment\n", 892 error)); 893 msg_freehdr(msghdr); 894 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 895 wakeup(msqkptr); 896 goto done2; 897 } 898 mtx_lock(&msq_mtx); 899 msgsz -= tlen; 900 msgp = (const char *)msgp + tlen; 901 next = msgmaps[next].next; 902 } 903 if (next != -1) 904 panic("didn't use all the msg segments"); 905 906 /* 907 * We've got the message. Unlock the msqid_ds. 908 */ 909 910 msqkptr->u.msg_perm.mode &= ~MSG_LOCKED; 911 912 /* 913 * Make sure that the msqid_ds is still allocated. 914 */ 915 916 if (msqkptr->u.msg_qbytes == 0) { 917 msg_freehdr(msghdr); 918 wakeup(msqkptr); 919 error = EIDRM; 920 goto done2; 921 } 922 923#ifdef MAC 924 /* 925 * Note: Since the task/thread allocates the msghdr and usually 926 * primes it with its own MAC label, for a majority of policies, it 927 * won't be necessary to check whether the msghdr has access 928 * permissions to the msgq. The mac_sysvmsq_check_msqsnd check would 929 * suffice in that case. However, this hook may be required where 930 * individual policies derive a non-identical label for the msghdr 931 * from the current thread label and may want to check the msghdr 932 * enqueue permissions, along with read/write permissions to the 933 * msgq. 934 */ 935 error = mac_sysvmsq_check_msgmsq(td->td_ucred, msghdr, msqkptr); 936 if (error != 0) { 937 msg_freehdr(msghdr); 938 wakeup(msqkptr); 939 goto done2; 940 } 941#endif 942 943 /* 944 * Put the message into the queue 945 */ 946 if (msqkptr->u.msg_first == NULL) { 947 msqkptr->u.msg_first = msghdr; 948 msqkptr->u.msg_last = msghdr; 949 } else { 950 msqkptr->u.msg_last->msg_next = msghdr; 951 msqkptr->u.msg_last = msghdr; 952 } 953 msqkptr->u.msg_last->msg_next = NULL; 954 955 msqkptr->u.msg_cbytes += msghdr->msg_ts; 956 msqkptr->u.msg_qnum++; 957 msqkptr->u.msg_lspid = td->td_proc->p_pid; 958 msqkptr->u.msg_stime = time_second; 959 960 wakeup(msqkptr); 961 td->td_retval[0] = 0; 962done2: 963 mtx_unlock(&msq_mtx); 964 return (error); 965} 966 967int 968msgsnd(td, uap) 969 struct thread *td; 970 register struct msgsnd_args *uap; 971{ 972 int error; 973 long mtype; 974 975 DPRINTF(("call to msgsnd(%d, %p, %zu, %d)\n", uap->msqid, uap->msgp, 976 uap->msgsz, uap->msgflg)); 977 978 if ((error = copyin(uap->msgp, &mtype, sizeof(mtype))) != 0) { 979 DPRINTF(("error %d copying the message type\n", error)); 980 return (error); 981 } 982 return (kern_msgsnd(td, uap->msqid, 983 (const char *)uap->msgp + sizeof(mtype), 984 uap->msgsz, uap->msgflg, mtype)); 985} 986 987#ifndef _SYS_SYSPROTO_H_ 988struct msgrcv_args { 989 int msqid; 990 void *msgp; 991 size_t msgsz; 992 long msgtyp; 993 int msgflg; 994}; 995#endif 996int 997kern_msgrcv(td, msqid, msgp, msgsz, msgtyp, msgflg, mtype) 998 struct thread *td; 999 int msqid; 1000 void *msgp; /* XXX msgp is actually mtext. */ 1001 size_t msgsz; 1002 long msgtyp; 1003 int msgflg; 1004 long *mtype; 1005{ 1006 size_t len; 1007 register struct msqid_kernel *msqkptr; 1008 register struct msg *msghdr; 1009 int msqix, error = 0; 1010 short next; 1011 1012 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 1013 return (ENOSYS); 1014 1015 msqix = IPCID_TO_IX(msqid); 1016 1017 if (msqix < 0 || msqix >= msginfo.msgmni) { 1018 DPRINTF(("msqid (%d) out of range (0<=msqid<%d)\n", msqix, 1019 msginfo.msgmni)); 1020 return (EINVAL); 1021 } 1022 1023 msqkptr = &msqids[msqix]; 1024 mtx_lock(&msq_mtx); 1025 if (msqkptr->u.msg_qbytes == 0) { 1026 DPRINTF(("no such message queue id\n")); 1027 error = EINVAL; 1028 goto done2; 1029 } 1030 if (msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1031 DPRINTF(("wrong sequence number\n")); 1032 error = EINVAL; 1033 goto done2; 1034 } 1035 1036 if ((error = ipcperm(td, &msqkptr->u.msg_perm, IPC_R))) { 1037 DPRINTF(("requester doesn't have read access\n")); 1038 goto done2; 1039 } 1040 1041#ifdef MAC 1042 error = mac_sysvmsq_check_msqrcv(td->td_ucred, msqkptr); 1043 if (error != 0) 1044 goto done2; 1045#endif 1046 1047 msghdr = NULL; 1048 while (msghdr == NULL) { 1049 if (msgtyp == 0) { 1050 msghdr = msqkptr->u.msg_first; 1051 if (msghdr != NULL) { 1052 if (msgsz < msghdr->msg_ts && 1053 (msgflg & MSG_NOERROR) == 0) { 1054 DPRINTF(("first message on the queue " 1055 "is too big (want %zu, got %d)\n", 1056 msgsz, msghdr->msg_ts)); 1057 error = E2BIG; 1058 goto done2; 1059 } 1060#ifdef MAC 1061 error = mac_sysvmsq_check_msgrcv(td->td_ucred, 1062 msghdr); 1063 if (error != 0) 1064 goto done2; 1065#endif 1066 if (msqkptr->u.msg_first == msqkptr->u.msg_last) { 1067 msqkptr->u.msg_first = NULL; 1068 msqkptr->u.msg_last = NULL; 1069 } else { 1070 msqkptr->u.msg_first = msghdr->msg_next; 1071 if (msqkptr->u.msg_first == NULL) 1072 panic("msg_first/last screwed up #1"); 1073 } 1074 } 1075 } else { 1076 struct msg *previous; 1077 struct msg **prev; 1078 1079 previous = NULL; 1080 prev = &(msqkptr->u.msg_first); 1081 while ((msghdr = *prev) != NULL) { 1082 /* 1083 * Is this message's type an exact match or is 1084 * this message's type less than or equal to 1085 * the absolute value of a negative msgtyp? 1086 * Note that the second half of this test can 1087 * NEVER be true if msgtyp is positive since 1088 * msg_type is always positive! 1089 */ 1090 1091 if (msgtyp == msghdr->msg_type || 1092 msghdr->msg_type <= -msgtyp) { 1093 DPRINTF(("found message type %ld, " 1094 "requested %ld\n", 1095 msghdr->msg_type, msgtyp)); 1096 if (msgsz < msghdr->msg_ts && 1097 (msgflg & MSG_NOERROR) == 0) { 1098 DPRINTF(("requested message " 1099 "on the queue is too big " 1100 "(want %zu, got %hu)\n", 1101 msgsz, msghdr->msg_ts)); 1102 error = E2BIG; 1103 goto done2; 1104 } 1105#ifdef MAC 1106 error = mac_sysvmsq_check_msgrcv( 1107 td->td_ucred, msghdr); 1108 if (error != 0) 1109 goto done2; 1110#endif 1111 *prev = msghdr->msg_next; 1112 if (msghdr == msqkptr->u.msg_last) { 1113 if (previous == NULL) { 1114 if (prev != 1115 &msqkptr->u.msg_first) 1116 panic("msg_first/last screwed up #2"); 1117 msqkptr->u.msg_first = 1118 NULL; 1119 msqkptr->u.msg_last = 1120 NULL; 1121 } else { 1122 if (prev == 1123 &msqkptr->u.msg_first) 1124 panic("msg_first/last screwed up #3"); 1125 msqkptr->u.msg_last = 1126 previous; 1127 } 1128 } 1129 break; 1130 } 1131 previous = msghdr; 1132 prev = &(msghdr->msg_next); 1133 } 1134 } 1135 1136 /* 1137 * We've either extracted the msghdr for the appropriate 1138 * message or there isn't one. 1139 * If there is one then bail out of this loop. 1140 */ 1141 1142 if (msghdr != NULL) 1143 break; 1144 1145 /* 1146 * Hmph! No message found. Does the user want to wait? 1147 */ 1148 1149 if ((msgflg & IPC_NOWAIT) != 0) { 1150 DPRINTF(("no appropriate message found (msgtyp=%ld)\n", 1151 msgtyp)); 1152 /* The SVID says to return ENOMSG. */ 1153 error = ENOMSG; 1154 goto done2; 1155 } 1156 1157 /* 1158 * Wait for something to happen 1159 */ 1160 1161 DPRINTF(("msgrcv: goodnight\n")); 1162 error = msleep(msqkptr, &msq_mtx, (PZERO - 4) | PCATCH, 1163 "msgrcv", 0); 1164 DPRINTF(("msgrcv: good morning (error=%d)\n", error)); 1165 1166 if (error != 0) { 1167 DPRINTF(("msgrcv: interrupted system call\n")); 1168 error = EINTR; 1169 goto done2; 1170 } 1171 1172 /* 1173 * Make sure that the msq queue still exists 1174 */ 1175 1176 if (msqkptr->u.msg_qbytes == 0 || 1177 msqkptr->u.msg_perm.seq != IPCID_TO_SEQ(msqid)) { 1178 DPRINTF(("msqid deleted\n")); 1179 error = EIDRM; 1180 goto done2; 1181 } 1182 } 1183 1184 /* 1185 * Return the message to the user. 1186 * 1187 * First, do the bookkeeping (before we risk being interrupted). 1188 */ 1189 1190 msqkptr->u.msg_cbytes -= msghdr->msg_ts; 1191 msqkptr->u.msg_qnum--; 1192 msqkptr->u.msg_lrpid = td->td_proc->p_pid; 1193 msqkptr->u.msg_rtime = time_second; 1194 1195 /* 1196 * Make msgsz the actual amount that we'll be returning. 1197 * Note that this effectively truncates the message if it is too long 1198 * (since msgsz is never increased). 1199 */ 1200 1201 DPRINTF(("found a message, msgsz=%zu, msg_ts=%hu\n", msgsz, 1202 msghdr->msg_ts)); 1203 if (msgsz > msghdr->msg_ts) 1204 msgsz = msghdr->msg_ts; 1205 *mtype = msghdr->msg_type; 1206 1207 /* 1208 * Return the segments to the user 1209 */ 1210 1211 next = msghdr->msg_spot; 1212 for (len = 0; len < msgsz; len += msginfo.msgssz) { 1213 size_t tlen; 1214 1215 if (msgsz - len > msginfo.msgssz) 1216 tlen = msginfo.msgssz; 1217 else 1218 tlen = msgsz - len; 1219 if (next <= -1) 1220 panic("next too low #3"); 1221 if (next >= msginfo.msgseg) 1222 panic("next out of range #3"); 1223 mtx_unlock(&msq_mtx); 1224 error = copyout(&msgpool[next * msginfo.msgssz], msgp, tlen); 1225 mtx_lock(&msq_mtx); 1226 if (error != 0) { 1227 DPRINTF(("error (%d) copying out message segment\n", 1228 error)); 1229 msg_freehdr(msghdr); 1230 wakeup(msqkptr); 1231 goto done2; 1232 } 1233 msgp = (char *)msgp + tlen; 1234 next = msgmaps[next].next; 1235 } 1236 1237 /* 1238 * Done, return the actual number of bytes copied out. 1239 */ 1240 1241 msg_freehdr(msghdr); 1242 wakeup(msqkptr); 1243 td->td_retval[0] = msgsz; 1244done2: 1245 mtx_unlock(&msq_mtx); 1246 return (error); 1247} 1248 1249int 1250msgrcv(td, uap) 1251 struct thread *td; 1252 register struct msgrcv_args *uap; 1253{ 1254 int error; 1255 long mtype; 1256 1257 DPRINTF(("call to msgrcv(%d, %p, %zu, %ld, %d)\n", uap->msqid, 1258 uap->msgp, uap->msgsz, uap->msgtyp, uap->msgflg)); 1259 1260 if ((error = kern_msgrcv(td, uap->msqid, 1261 (char *)uap->msgp + sizeof(mtype), uap->msgsz, 1262 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1263 return (error); 1264 if ((error = copyout(&mtype, uap->msgp, sizeof(mtype))) != 0) 1265 DPRINTF(("error %d copying the message type\n", error)); 1266 return (error); 1267} 1268 1269static int 1270sysctl_msqids(SYSCTL_HANDLER_ARGS) 1271{ 1272 1273 return (SYSCTL_OUT(req, msqids, 1274 sizeof(struct msqid_kernel) * msginfo.msgmni)); 1275} 1276 1277SYSCTL_INT(_kern_ipc, OID_AUTO, msgmax, CTLFLAG_RD, &msginfo.msgmax, 0, 1278 "Maximum message size"); 1279SYSCTL_INT(_kern_ipc, OID_AUTO, msgmni, CTLFLAG_RDTUN, &msginfo.msgmni, 0, 1280 "Number of message queue identifiers"); 1281SYSCTL_INT(_kern_ipc, OID_AUTO, msgmnb, CTLFLAG_RDTUN, &msginfo.msgmnb, 0, 1282 "Maximum number of bytes in a queue"); 1283SYSCTL_INT(_kern_ipc, OID_AUTO, msgtql, CTLFLAG_RDTUN, &msginfo.msgtql, 0, 1284 "Maximum number of messages in the system"); 1285SYSCTL_INT(_kern_ipc, OID_AUTO, msgssz, CTLFLAG_RDTUN, &msginfo.msgssz, 0, 1286 "Size of a message segment"); 1287SYSCTL_INT(_kern_ipc, OID_AUTO, msgseg, CTLFLAG_RDTUN, &msginfo.msgseg, 0, 1288 "Number of message segments"); 1289SYSCTL_PROC(_kern_ipc, OID_AUTO, msqids, CTLTYPE_OPAQUE | CTLFLAG_RD, 1290 NULL, 0, sysctl_msqids, "", "Message queue IDs"); 1291 1292#ifdef COMPAT_FREEBSD32 1293int 1294freebsd32_msgsys(struct thread *td, struct freebsd32_msgsys_args *uap) 1295{ 1296 1297#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1298 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1299 switch (uap->which) { 1300 case 0: 1301 return (freebsd7_freebsd32_msgctl(td, 1302 (struct freebsd7_freebsd32_msgctl_args *)&uap->a2)); 1303 case 2: 1304 return (freebsd32_msgsnd(td, 1305 (struct freebsd32_msgsnd_args *)&uap->a2)); 1306 case 3: 1307 return (freebsd32_msgrcv(td, 1308 (struct freebsd32_msgrcv_args *)&uap->a2)); 1309 default: 1310 return (msgsys(td, (struct msgsys_args *)uap)); 1311 } 1312#else 1313 return (nosys(td, NULL)); 1314#endif 1315} 1316 1317#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1318 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1319int 1320freebsd7_freebsd32_msgctl(struct thread *td, 1321 struct freebsd7_freebsd32_msgctl_args *uap) 1322{ 1323 struct msqid_ds msqbuf; 1324 struct msqid_ds32_old msqbuf32; 1325 int error; 1326 1327 if (uap->cmd == IPC_SET) { 1328 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1329 if (error) 1330 return (error); 1331 freebsd32_ipcperm_old_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1332 PTRIN_CP(msqbuf32, msqbuf, msg_first); 1333 PTRIN_CP(msqbuf32, msqbuf, msg_last); 1334 CP(msqbuf32, msqbuf, msg_cbytes); 1335 CP(msqbuf32, msqbuf, msg_qnum); 1336 CP(msqbuf32, msqbuf, msg_qbytes); 1337 CP(msqbuf32, msqbuf, msg_lspid); 1338 CP(msqbuf32, msqbuf, msg_lrpid); 1339 CP(msqbuf32, msqbuf, msg_stime); 1340 CP(msqbuf32, msqbuf, msg_rtime); 1341 CP(msqbuf32, msqbuf, msg_ctime); 1342 } 1343 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1344 if (error) 1345 return (error); 1346 if (uap->cmd == IPC_STAT) { 1347 bzero(&msqbuf32, sizeof(msqbuf32)); 1348 freebsd32_ipcperm_old_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1349 PTROUT_CP(msqbuf, msqbuf32, msg_first); 1350 PTROUT_CP(msqbuf, msqbuf32, msg_last); 1351 CP(msqbuf, msqbuf32, msg_cbytes); 1352 CP(msqbuf, msqbuf32, msg_qnum); 1353 CP(msqbuf, msqbuf32, msg_qbytes); 1354 CP(msqbuf, msqbuf32, msg_lspid); 1355 CP(msqbuf, msqbuf32, msg_lrpid); 1356 CP(msqbuf, msqbuf32, msg_stime); 1357 CP(msqbuf, msqbuf32, msg_rtime); 1358 CP(msqbuf, msqbuf32, msg_ctime); 1359 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1360 } 1361 return (error); 1362} 1363#endif 1364 1365int 1366freebsd32_msgctl(struct thread *td, struct freebsd32_msgctl_args *uap) 1367{ 1368 struct msqid_ds msqbuf; 1369 struct msqid_ds32 msqbuf32; 1370 int error; 1371 1372 if (uap->cmd == IPC_SET) { 1373 error = copyin(uap->buf, &msqbuf32, sizeof(msqbuf32)); 1374 if (error) 1375 return (error); 1376 freebsd32_ipcperm_in(&msqbuf32.msg_perm, &msqbuf.msg_perm); 1377 PTRIN_CP(msqbuf32, msqbuf, msg_first); 1378 PTRIN_CP(msqbuf32, msqbuf, msg_last); 1379 CP(msqbuf32, msqbuf, msg_cbytes); 1380 CP(msqbuf32, msqbuf, msg_qnum); 1381 CP(msqbuf32, msqbuf, msg_qbytes); 1382 CP(msqbuf32, msqbuf, msg_lspid); 1383 CP(msqbuf32, msqbuf, msg_lrpid); 1384 CP(msqbuf32, msqbuf, msg_stime); 1385 CP(msqbuf32, msqbuf, msg_rtime); 1386 CP(msqbuf32, msqbuf, msg_ctime); 1387 } 1388 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1389 if (error) 1390 return (error); 1391 if (uap->cmd == IPC_STAT) { 1392 freebsd32_ipcperm_out(&msqbuf.msg_perm, &msqbuf32.msg_perm); 1393 PTROUT_CP(msqbuf, msqbuf32, msg_first); 1394 PTROUT_CP(msqbuf, msqbuf32, msg_last); 1395 CP(msqbuf, msqbuf32, msg_cbytes); 1396 CP(msqbuf, msqbuf32, msg_qnum); 1397 CP(msqbuf, msqbuf32, msg_qbytes); 1398 CP(msqbuf, msqbuf32, msg_lspid); 1399 CP(msqbuf, msqbuf32, msg_lrpid); 1400 CP(msqbuf, msqbuf32, msg_stime); 1401 CP(msqbuf, msqbuf32, msg_rtime); 1402 CP(msqbuf, msqbuf32, msg_ctime); 1403 error = copyout(&msqbuf32, uap->buf, sizeof(struct msqid_ds32)); 1404 } 1405 return (error); 1406} 1407 1408int 1409freebsd32_msgsnd(struct thread *td, struct freebsd32_msgsnd_args *uap) 1410{ 1411 const void *msgp; 1412 long mtype; 1413 int32_t mtype32; 1414 int error; 1415 1416 msgp = PTRIN(uap->msgp); 1417 if ((error = copyin(msgp, &mtype32, sizeof(mtype32))) != 0) 1418 return (error); 1419 mtype = mtype32; 1420 return (kern_msgsnd(td, uap->msqid, 1421 (const char *)msgp + sizeof(mtype32), 1422 uap->msgsz, uap->msgflg, mtype)); 1423} 1424 1425int 1426freebsd32_msgrcv(struct thread *td, struct freebsd32_msgrcv_args *uap) 1427{ 1428 void *msgp; 1429 long mtype; 1430 int32_t mtype32; 1431 int error; 1432 1433 msgp = PTRIN(uap->msgp); 1434 if ((error = kern_msgrcv(td, uap->msqid, 1435 (char *)msgp + sizeof(mtype32), uap->msgsz, 1436 uap->msgtyp, uap->msgflg, &mtype)) != 0) 1437 return (error); 1438 mtype32 = (int32_t)mtype; 1439 return (copyout(&mtype32, msgp, sizeof(mtype32))); 1440} 1441#endif 1442 1443#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1444 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1445 1446/* XXX casting to (sy_call_t *) is bogus, as usual. */ 1447static sy_call_t *msgcalls[] = { 1448 (sy_call_t *)freebsd7_msgctl, (sy_call_t *)msgget, 1449 (sy_call_t *)msgsnd, (sy_call_t *)msgrcv 1450}; 1451 1452/* 1453 * Entry point for all MSG calls. 1454 */ 1455int 1456msgsys(td, uap) 1457 struct thread *td; 1458 /* XXX actually varargs. */ 1459 struct msgsys_args /* { 1460 int which; 1461 int a2; 1462 int a3; 1463 int a4; 1464 int a5; 1465 int a6; 1466 } */ *uap; 1467{ 1468 int error; 1469 1470 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 1471 return (ENOSYS); 1472 if (uap->which < 0 || 1473 uap->which >= sizeof(msgcalls)/sizeof(msgcalls[0])) 1474 return (EINVAL); 1475 error = (*msgcalls[uap->which])(td, &uap->a2); 1476 return (error); 1477} 1478 1479#ifndef CP 1480#define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0) 1481#endif 1482 1483#ifndef _SYS_SYSPROTO_H_ 1484struct freebsd7_msgctl_args { 1485 int msqid; 1486 int cmd; 1487 struct msqid_ds_old *buf; 1488}; 1489#endif 1490int 1491freebsd7_msgctl(td, uap) 1492 struct thread *td; 1493 struct freebsd7_msgctl_args *uap; 1494{ 1495 struct msqid_ds_old msqold; 1496 struct msqid_ds msqbuf; 1497 int error; 1498 1499 DPRINTF(("call to freebsd7_msgctl(%d, %d, %p)\n", uap->msqid, uap->cmd, 1500 uap->buf)); 1501 if (uap->cmd == IPC_SET) { 1502 error = copyin(uap->buf, &msqold, sizeof(msqold)); 1503 if (error) 1504 return (error); 1505 ipcperm_old2new(&msqold.msg_perm, &msqbuf.msg_perm); 1506 CP(msqold, msqbuf, msg_first); 1507 CP(msqold, msqbuf, msg_last); 1508 CP(msqold, msqbuf, msg_cbytes); 1509 CP(msqold, msqbuf, msg_qnum); 1510 CP(msqold, msqbuf, msg_qbytes); 1511 CP(msqold, msqbuf, msg_lspid); 1512 CP(msqold, msqbuf, msg_lrpid); 1513 CP(msqold, msqbuf, msg_stime); 1514 CP(msqold, msqbuf, msg_rtime); 1515 CP(msqold, msqbuf, msg_ctime); 1516 } 1517 error = kern_msgctl(td, uap->msqid, uap->cmd, &msqbuf); 1518 if (error) 1519 return (error); 1520 if (uap->cmd == IPC_STAT) { 1521 bzero(&msqold, sizeof(msqold)); 1522 ipcperm_new2old(&msqbuf.msg_perm, &msqold.msg_perm); 1523 CP(msqbuf, msqold, msg_first); 1524 CP(msqbuf, msqold, msg_last); 1525 CP(msqbuf, msqold, msg_cbytes); 1526 CP(msqbuf, msqold, msg_qnum); 1527 CP(msqbuf, msqold, msg_qbytes); 1528 CP(msqbuf, msqold, msg_lspid); 1529 CP(msqbuf, msqold, msg_lrpid); 1530 CP(msqbuf, msqold, msg_stime); 1531 CP(msqbuf, msqold, msg_rtime); 1532 CP(msqbuf, msqold, msg_ctime); 1533 error = copyout(&msqold, uap->buf, sizeof(struct msqid_ds_old)); 1534 } 1535 return (error); 1536} 1537 1538#undef CP 1539 1540#endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 || 1541 COMPAT_FREEBSD7 */ 1542