1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2005 David Xu <davidxu@freebsd.org> 5 * Copyright (c) 2016-2017 Robert N. M. Watson 6 * All rights reserved. 7 * 8 * Portions of this software were developed by BAE Systems, the University of 9 * Cambridge Computer Laboratory, and Memorial University under DARPA/AFRL 10 * contract FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent 11 * Computing (TC) research program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 */ 35 36 /* 37 * POSIX message queue implementation. 38 * 39 * 1) A mqueue filesystem can be mounted, each message queue appears 40 * in mounted directory, user can change queue's permission and 41 * ownership, or remove a queue. Manually creating a file in the 42 * directory causes a message queue to be created in the kernel with 43 * default message queue attributes applied and same name used, this 44 * method is not advocated since mq_open syscall allows user to specify 45 * different attributes. Also the file system can be mounted multiple 46 * times at different mount points but shows same contents. 47 * 48 * 2) Standard POSIX message queue API. The syscalls do not use vfs layer, 49 * but directly operate on internal data structure, this allows user to 50 * use the IPC facility without having to mount mqueue file system. 51 */ 52 53 #include <sys/cdefs.h> 54 __FBSDID("$FreeBSD$"); 55 56 #include "opt_capsicum.h" 57 58 #include <sys/param.h> 59 #include <sys/kernel.h> 60 #include <sys/systm.h> 61 #include <sys/limits.h> 62 #include <sys/malloc.h> 63 #include <sys/buf.h> 64 #include <sys/capsicum.h> 65 #include <sys/dirent.h> 66 #include <sys/event.h> 67 #include <sys/eventhandler.h> 68 #include <sys/fcntl.h> 69 #include <sys/file.h> 70 #include <sys/filedesc.h> 71 #include <sys/jail.h> 72 #include <sys/lock.h> 73 #include <sys/module.h> 74 #include <sys/mount.h> 75 #include <sys/mqueue.h> 76 #include <sys/mutex.h> 77 #include <sys/namei.h> 78 #include <sys/posix4.h> 79 #include <sys/poll.h> 80 #include <sys/priv.h> 81 #include <sys/proc.h> 82 #include <sys/queue.h> 83 #include <sys/sysproto.h> 84 #include <sys/stat.h> 85 #include <sys/syscall.h> 86 #include <sys/syscallsubr.h> 87 #include <sys/sysent.h> 88 #include <sys/sx.h> 89 #include <sys/sysctl.h> 90 #include <sys/taskqueue.h> 91 #include <sys/unistd.h> 92 #include <sys/user.h> 93 #include <sys/vnode.h> 94 #include <machine/atomic.h> 95 96 #include <security/audit/audit.h> 97 98 FEATURE(p1003_1b_mqueue, "POSIX P1003.1B message queues support"); 99 100 /* 101 * Limits and constants 102 */ 103 #define MQFS_NAMELEN NAME_MAX 104 #define MQFS_DELEN (8 + MQFS_NAMELEN) 105 106 /* node types */ 107 typedef enum { 108 mqfstype_none = 0, 109 mqfstype_root, 110 mqfstype_dir, 111 mqfstype_this, 112 mqfstype_parent, 113 mqfstype_file, 114 mqfstype_symlink, 115 } mqfs_type_t; 116 117 struct mqfs_node; 118 119 /* 120 * mqfs_info: describes a mqfs instance 121 */ 122 struct mqfs_info { 123 struct sx mi_lock; 124 struct mqfs_node *mi_root; 125 struct unrhdr *mi_unrhdr; 126 }; 127 128 struct mqfs_vdata { 129 LIST_ENTRY(mqfs_vdata) mv_link; 130 struct mqfs_node *mv_node; 131 struct vnode *mv_vnode; 132 struct task mv_task; 133 }; 134 135 /* 136 * mqfs_node: describes a node (file or directory) within a mqfs 137 */ 138 struct mqfs_node { 139 char mn_name[MQFS_NAMELEN+1]; 140 struct mqfs_info *mn_info; 141 struct mqfs_node *mn_parent; 142 LIST_HEAD(,mqfs_node) mn_children; 143 LIST_ENTRY(mqfs_node) mn_sibling; 144 LIST_HEAD(,mqfs_vdata) mn_vnodes; 145 const void *mn_pr_root; 146 int mn_refcount; 147 mqfs_type_t mn_type; 148 int mn_deleted; 149 uint32_t mn_fileno; 150 void *mn_data; 151 struct timespec mn_birth; 152 struct timespec mn_ctime; 153 struct timespec mn_atime; 154 struct timespec mn_mtime; 155 uid_t mn_uid; 156 gid_t mn_gid; 157 int mn_mode; 158 }; 159 160 #define VTON(vp) (((struct mqfs_vdata *)((vp)->v_data))->mv_node) 161 #define VTOMQ(vp) ((struct mqueue *)(VTON(vp)->mn_data)) 162 #define VFSTOMQFS(m) ((struct mqfs_info *)((m)->mnt_data)) 163 #define FPTOMQ(fp) ((struct mqueue *)(((struct mqfs_node *) \ 164 (fp)->f_data)->mn_data)) 165 166 TAILQ_HEAD(msgq, mqueue_msg); 167 168 struct mqueue; 169 170 struct mqueue_notifier { 171 LIST_ENTRY(mqueue_notifier) nt_link; 172 struct sigevent nt_sigev; 173 ksiginfo_t nt_ksi; 174 struct proc *nt_proc; 175 }; 176 177 struct mqueue { 178 struct mtx mq_mutex; 179 int mq_flags; 180 long mq_maxmsg; 181 long mq_msgsize; 182 long mq_curmsgs; 183 long mq_totalbytes; 184 struct msgq mq_msgq; 185 int mq_receivers; 186 int mq_senders; 187 struct selinfo mq_rsel; 188 struct selinfo mq_wsel; 189 struct mqueue_notifier *mq_notifier; 190 }; 191 192 #define MQ_RSEL 0x01 193 #define MQ_WSEL 0x02 194 195 struct mqueue_msg { 196 TAILQ_ENTRY(mqueue_msg) msg_link; 197 unsigned int msg_prio; 198 unsigned int msg_size; 199 /* following real data... */ 200 }; 201 202 static SYSCTL_NODE(_kern, OID_AUTO, mqueue, CTLFLAG_RW, 0, 203 "POSIX real time message queue"); 204 205 static int default_maxmsg = 10; 206 static int default_msgsize = 1024; 207 208 static int maxmsg = 100; 209 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsg, CTLFLAG_RW, 210 &maxmsg, 0, "Default maximum messages in queue"); 211 static int maxmsgsize = 16384; 212 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsgsize, CTLFLAG_RW, 213 &maxmsgsize, 0, "Default maximum message size"); 214 static int maxmq = 100; 215 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmq, CTLFLAG_RW, 216 &maxmq, 0, "maximum message queues"); 217 static int curmq = 0; 218 SYSCTL_INT(_kern_mqueue, OID_AUTO, curmq, CTLFLAG_RW, 219 &curmq, 0, "current message queue number"); 220 static int unloadable = 0; 221 static MALLOC_DEFINE(M_MQUEUEDATA, "mqdata", "mqueue data"); 222 223 static eventhandler_tag exit_tag; 224 225 /* Only one instance per-system */ 226 static struct mqfs_info mqfs_data; 227 static uma_zone_t mqnode_zone; 228 static uma_zone_t mqueue_zone; 229 static uma_zone_t mvdata_zone; 230 static uma_zone_t mqnoti_zone; 231 static struct vop_vector mqfs_vnodeops; 232 static struct fileops mqueueops; 233 static unsigned mqfs_osd_jail_slot; 234 235 /* 236 * Directory structure construction and manipulation 237 */ 238 #ifdef notyet 239 static struct mqfs_node *mqfs_create_dir(struct mqfs_node *parent, 240 const char *name, int namelen, struct ucred *cred, int mode); 241 static struct mqfs_node *mqfs_create_link(struct mqfs_node *parent, 242 const char *name, int namelen, struct ucred *cred, int mode); 243 #endif 244 245 static struct mqfs_node *mqfs_create_file(struct mqfs_node *parent, 246 const char *name, int namelen, struct ucred *cred, int mode); 247 static int mqfs_destroy(struct mqfs_node *mn); 248 static void mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn); 249 static void mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn); 250 static int mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn); 251 static int mqfs_prison_remove(void *obj, void *data); 252 253 /* 254 * Message queue construction and maniplation 255 */ 256 static struct mqueue *mqueue_alloc(const struct mq_attr *attr); 257 static void mqueue_free(struct mqueue *mq); 258 static int mqueue_send(struct mqueue *mq, const char *msg_ptr, 259 size_t msg_len, unsigned msg_prio, int waitok, 260 const struct timespec *abs_timeout); 261 static int mqueue_receive(struct mqueue *mq, char *msg_ptr, 262 size_t msg_len, unsigned *msg_prio, int waitok, 263 const struct timespec *abs_timeout); 264 static int _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, 265 int timo); 266 static int _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, 267 int timo); 268 static void mqueue_send_notification(struct mqueue *mq); 269 static void mqueue_fdclose(struct thread *td, int fd, struct file *fp); 270 static void mq_proc_exit(void *arg, struct proc *p); 271 272 /* 273 * kqueue filters 274 */ 275 static void filt_mqdetach(struct knote *kn); 276 static int filt_mqread(struct knote *kn, long hint); 277 static int filt_mqwrite(struct knote *kn, long hint); 278 279 struct filterops mq_rfiltops = { 280 .f_isfd = 1, 281 .f_detach = filt_mqdetach, 282 .f_event = filt_mqread, 283 }; 284 struct filterops mq_wfiltops = { 285 .f_isfd = 1, 286 .f_detach = filt_mqdetach, 287 .f_event = filt_mqwrite, 288 }; 289 290 /* 291 * Initialize fileno bitmap 292 */ 293 static void 294 mqfs_fileno_init(struct mqfs_info *mi) 295 { 296 struct unrhdr *up; 297 298 up = new_unrhdr(1, INT_MAX, NULL); 299 mi->mi_unrhdr = up; 300 } 301 302 /* 303 * Tear down fileno bitmap 304 */ 305 static void 306 mqfs_fileno_uninit(struct mqfs_info *mi) 307 { 308 struct unrhdr *up; 309 310 up = mi->mi_unrhdr; 311 mi->mi_unrhdr = NULL; 312 delete_unrhdr(up); 313 } 314 315 /* 316 * Allocate a file number 317 */ 318 static void 319 mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn) 320 { 321 /* make sure our parent has a file number */ 322 if (mn->mn_parent && !mn->mn_parent->mn_fileno) 323 mqfs_fileno_alloc(mi, mn->mn_parent); 324 325 switch (mn->mn_type) { 326 case mqfstype_root: 327 case mqfstype_dir: 328 case mqfstype_file: 329 case mqfstype_symlink: 330 mn->mn_fileno = alloc_unr(mi->mi_unrhdr); 331 break; 332 case mqfstype_this: 333 KASSERT(mn->mn_parent != NULL, 334 ("mqfstype_this node has no parent")); 335 mn->mn_fileno = mn->mn_parent->mn_fileno; 336 break; 337 case mqfstype_parent: 338 KASSERT(mn->mn_parent != NULL, 339 ("mqfstype_parent node has no parent")); 340 if (mn->mn_parent == mi->mi_root) { 341 mn->mn_fileno = mn->mn_parent->mn_fileno; 342 break; 343 } 344 KASSERT(mn->mn_parent->mn_parent != NULL, 345 ("mqfstype_parent node has no grandparent")); 346 mn->mn_fileno = mn->mn_parent->mn_parent->mn_fileno; 347 break; 348 default: 349 KASSERT(0, 350 ("mqfs_fileno_alloc() called for unknown type node: %d", 351 mn->mn_type)); 352 break; 353 } 354 } 355 356 /* 357 * Release a file number 358 */ 359 static void 360 mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn) 361 { 362 switch (mn->mn_type) { 363 case mqfstype_root: 364 case mqfstype_dir: 365 case mqfstype_file: 366 case mqfstype_symlink: 367 free_unr(mi->mi_unrhdr, mn->mn_fileno); 368 break; 369 case mqfstype_this: 370 case mqfstype_parent: 371 /* ignore these, as they don't "own" their file number */ 372 break; 373 default: 374 KASSERT(0, 375 ("mqfs_fileno_free() called for unknown type node: %d", 376 mn->mn_type)); 377 break; 378 } 379 } 380 381 static __inline struct mqfs_node * 382 mqnode_alloc(void) 383 { 384 return uma_zalloc(mqnode_zone, M_WAITOK | M_ZERO); 385 } 386 387 static __inline void 388 mqnode_free(struct mqfs_node *node) 389 { 390 uma_zfree(mqnode_zone, node); 391 } 392 393 static __inline void 394 mqnode_addref(struct mqfs_node *node) 395 { 396 atomic_fetchadd_int(&node->mn_refcount, 1); 397 } 398 399 static __inline void 400 mqnode_release(struct mqfs_node *node) 401 { 402 struct mqfs_info *mqfs; 403 int old, exp; 404 405 mqfs = node->mn_info; 406 old = atomic_fetchadd_int(&node->mn_refcount, -1); 407 if (node->mn_type == mqfstype_dir || 408 node->mn_type == mqfstype_root) 409 exp = 3; /* include . and .. */ 410 else 411 exp = 1; 412 if (old == exp) { 413 int locked = sx_xlocked(&mqfs->mi_lock); 414 if (!locked) 415 sx_xlock(&mqfs->mi_lock); 416 mqfs_destroy(node); 417 if (!locked) 418 sx_xunlock(&mqfs->mi_lock); 419 } 420 } 421 422 /* 423 * Add a node to a directory 424 */ 425 static int 426 mqfs_add_node(struct mqfs_node *parent, struct mqfs_node *node) 427 { 428 KASSERT(parent != NULL, ("%s(): parent is NULL", __func__)); 429 KASSERT(parent->mn_info != NULL, 430 ("%s(): parent has no mn_info", __func__)); 431 KASSERT(parent->mn_type == mqfstype_dir || 432 parent->mn_type == mqfstype_root, 433 ("%s(): parent is not a directory", __func__)); 434 435 node->mn_info = parent->mn_info; 436 node->mn_parent = parent; 437 LIST_INIT(&node->mn_children); 438 LIST_INIT(&node->mn_vnodes); 439 LIST_INSERT_HEAD(&parent->mn_children, node, mn_sibling); 440 mqnode_addref(parent); 441 return (0); 442 } 443 444 static struct mqfs_node * 445 mqfs_create_node(const char *name, int namelen, struct ucred *cred, int mode, 446 int nodetype) 447 { 448 struct mqfs_node *node; 449 450 node = mqnode_alloc(); 451 strncpy(node->mn_name, name, namelen); 452 node->mn_pr_root = cred->cr_prison->pr_root; 453 node->mn_type = nodetype; 454 node->mn_refcount = 1; 455 vfs_timestamp(&node->mn_birth); 456 node->mn_ctime = node->mn_atime = node->mn_mtime 457 = node->mn_birth; 458 node->mn_uid = cred->cr_uid; 459 node->mn_gid = cred->cr_gid; 460 node->mn_mode = mode; 461 return (node); 462 } 463 464 /* 465 * Create a file 466 */ 467 static struct mqfs_node * 468 mqfs_create_file(struct mqfs_node *parent, const char *name, int namelen, 469 struct ucred *cred, int mode) 470 { 471 struct mqfs_node *node; 472 473 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_file); 474 if (mqfs_add_node(parent, node) != 0) { 475 mqnode_free(node); 476 return (NULL); 477 } 478 return (node); 479 } 480 481 /* 482 * Add . and .. to a directory 483 */ 484 static int 485 mqfs_fixup_dir(struct mqfs_node *parent) 486 { 487 struct mqfs_node *dir; 488 489 dir = mqnode_alloc(); 490 dir->mn_name[0] = '.'; 491 dir->mn_type = mqfstype_this; 492 dir->mn_refcount = 1; 493 if (mqfs_add_node(parent, dir) != 0) { 494 mqnode_free(dir); 495 return (-1); 496 } 497 498 dir = mqnode_alloc(); 499 dir->mn_name[0] = dir->mn_name[1] = '.'; 500 dir->mn_type = mqfstype_parent; 501 dir->mn_refcount = 1; 502 503 if (mqfs_add_node(parent, dir) != 0) { 504 mqnode_free(dir); 505 return (-1); 506 } 507 508 return (0); 509 } 510 511 #ifdef notyet 512 513 /* 514 * Create a directory 515 */ 516 static struct mqfs_node * 517 mqfs_create_dir(struct mqfs_node *parent, const char *name, int namelen, 518 struct ucred *cred, int mode) 519 { 520 struct mqfs_node *node; 521 522 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_dir); 523 if (mqfs_add_node(parent, node) != 0) { 524 mqnode_free(node); 525 return (NULL); 526 } 527 528 if (mqfs_fixup_dir(node) != 0) { 529 mqfs_destroy(node); 530 return (NULL); 531 } 532 return (node); 533 } 534 535 /* 536 * Create a symlink 537 */ 538 static struct mqfs_node * 539 mqfs_create_link(struct mqfs_node *parent, const char *name, int namelen, 540 struct ucred *cred, int mode) 541 { 542 struct mqfs_node *node; 543 544 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_symlink); 545 if (mqfs_add_node(parent, node) != 0) { 546 mqnode_free(node); 547 return (NULL); 548 } 549 return (node); 550 } 551 552 #endif 553 554 /* 555 * Destroy a node or a tree of nodes 556 */ 557 static int 558 mqfs_destroy(struct mqfs_node *node) 559 { 560 struct mqfs_node *parent; 561 562 KASSERT(node != NULL, 563 ("%s(): node is NULL", __func__)); 564 KASSERT(node->mn_info != NULL, 565 ("%s(): node has no mn_info", __func__)); 566 567 /* destroy children */ 568 if (node->mn_type == mqfstype_dir || node->mn_type == mqfstype_root) 569 while (! LIST_EMPTY(&node->mn_children)) 570 mqfs_destroy(LIST_FIRST(&node->mn_children)); 571 572 /* unlink from parent */ 573 if ((parent = node->mn_parent) != NULL) { 574 KASSERT(parent->mn_info == node->mn_info, 575 ("%s(): parent has different mn_info", __func__)); 576 LIST_REMOVE(node, mn_sibling); 577 } 578 579 if (node->mn_fileno != 0) 580 mqfs_fileno_free(node->mn_info, node); 581 if (node->mn_data != NULL) 582 mqueue_free(node->mn_data); 583 mqnode_free(node); 584 return (0); 585 } 586 587 /* 588 * Mount a mqfs instance 589 */ 590 static int 591 mqfs_mount(struct mount *mp) 592 { 593 struct statfs *sbp; 594 595 if (mp->mnt_flag & MNT_UPDATE) 596 return (EOPNOTSUPP); 597 598 mp->mnt_data = &mqfs_data; 599 MNT_ILOCK(mp); 600 mp->mnt_flag |= MNT_LOCAL; 601 MNT_IUNLOCK(mp); 602 vfs_getnewfsid(mp); 603 604 sbp = &mp->mnt_stat; 605 vfs_mountedfrom(mp, "mqueue"); 606 sbp->f_bsize = PAGE_SIZE; 607 sbp->f_iosize = PAGE_SIZE; 608 sbp->f_blocks = 1; 609 sbp->f_bfree = 0; 610 sbp->f_bavail = 0; 611 sbp->f_files = 1; 612 sbp->f_ffree = 0; 613 return (0); 614 } 615 616 /* 617 * Unmount a mqfs instance 618 */ 619 static int 620 mqfs_unmount(struct mount *mp, int mntflags) 621 { 622 int error; 623 624 error = vflush(mp, 0, (mntflags & MNT_FORCE) ? FORCECLOSE : 0, 625 curthread); 626 return (error); 627 } 628 629 /* 630 * Return a root vnode 631 */ 632 static int 633 mqfs_root(struct mount *mp, int flags, struct vnode **vpp) 634 { 635 struct mqfs_info *mqfs; 636 int ret; 637 638 mqfs = VFSTOMQFS(mp); 639 ret = mqfs_allocv(mp, vpp, mqfs->mi_root); 640 return (ret); 641 } 642 643 /* 644 * Return filesystem stats 645 */ 646 static int 647 mqfs_statfs(struct mount *mp, struct statfs *sbp) 648 { 649 /* XXX update statistics */ 650 return (0); 651 } 652 653 /* 654 * Initialize a mqfs instance 655 */ 656 static int 657 mqfs_init(struct vfsconf *vfc) 658 { 659 struct mqfs_node *root; 660 struct mqfs_info *mi; 661 osd_method_t methods[PR_MAXMETHOD] = { 662 [PR_METHOD_REMOVE] = mqfs_prison_remove, 663 }; 664 665 mqnode_zone = uma_zcreate("mqnode", sizeof(struct mqfs_node), 666 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 667 mqueue_zone = uma_zcreate("mqueue", sizeof(struct mqueue), 668 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 669 mvdata_zone = uma_zcreate("mvdata", 670 sizeof(struct mqfs_vdata), NULL, NULL, NULL, 671 NULL, UMA_ALIGN_PTR, 0); 672 mqnoti_zone = uma_zcreate("mqnotifier", sizeof(struct mqueue_notifier), 673 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 674 mi = &mqfs_data; 675 sx_init(&mi->mi_lock, "mqfs lock"); 676 /* set up the root diretory */ 677 root = mqfs_create_node("/", 1, curthread->td_ucred, 01777, 678 mqfstype_root); 679 root->mn_info = mi; 680 LIST_INIT(&root->mn_children); 681 LIST_INIT(&root->mn_vnodes); 682 mi->mi_root = root; 683 mqfs_fileno_init(mi); 684 mqfs_fileno_alloc(mi, root); 685 mqfs_fixup_dir(root); 686 exit_tag = EVENTHANDLER_REGISTER(process_exit, mq_proc_exit, NULL, 687 EVENTHANDLER_PRI_ANY); 688 mq_fdclose = mqueue_fdclose; 689 p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING); 690 mqfs_osd_jail_slot = osd_jail_register(NULL, methods); 691 return (0); 692 } 693 694 /* 695 * Destroy a mqfs instance 696 */ 697 static int 698 mqfs_uninit(struct vfsconf *vfc) 699 { 700 struct mqfs_info *mi; 701 702 if (!unloadable) 703 return (EOPNOTSUPP); 704 osd_jail_deregister(mqfs_osd_jail_slot); 705 EVENTHANDLER_DEREGISTER(process_exit, exit_tag); 706 mi = &mqfs_data; 707 mqfs_destroy(mi->mi_root); 708 mi->mi_root = NULL; 709 mqfs_fileno_uninit(mi); 710 sx_destroy(&mi->mi_lock); 711 uma_zdestroy(mqnode_zone); 712 uma_zdestroy(mqueue_zone); 713 uma_zdestroy(mvdata_zone); 714 uma_zdestroy(mqnoti_zone); 715 return (0); 716 } 717 718 /* 719 * task routine 720 */ 721 static void 722 do_recycle(void *context, int pending __unused) 723 { 724 struct vnode *vp = (struct vnode *)context; 725 726 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 727 vrecycle(vp); 728 VOP_UNLOCK(vp, 0); 729 vdrop(vp); 730 } 731 732 /* 733 * Allocate a vnode 734 */ 735 static int 736 mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn) 737 { 738 struct mqfs_vdata *vd; 739 struct mqfs_info *mqfs; 740 struct vnode *newvpp; 741 int error; 742 743 mqfs = pn->mn_info; 744 *vpp = NULL; 745 sx_xlock(&mqfs->mi_lock); 746 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) { 747 if (vd->mv_vnode->v_mount == mp) { 748 vhold(vd->mv_vnode); 749 break; 750 } 751 } 752 753 if (vd != NULL) { 754 found: 755 *vpp = vd->mv_vnode; 756 sx_xunlock(&mqfs->mi_lock); 757 error = vget(*vpp, LK_RETRY | LK_EXCLUSIVE, curthread); 758 vdrop(*vpp); 759 return (error); 760 } 761 sx_xunlock(&mqfs->mi_lock); 762 763 error = getnewvnode("mqueue", mp, &mqfs_vnodeops, &newvpp); 764 if (error) 765 return (error); 766 vn_lock(newvpp, LK_EXCLUSIVE | LK_RETRY); 767 error = insmntque(newvpp, mp); 768 if (error != 0) 769 return (error); 770 771 sx_xlock(&mqfs->mi_lock); 772 /* 773 * Check if it has already been allocated 774 * while we were blocked. 775 */ 776 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) { 777 if (vd->mv_vnode->v_mount == mp) { 778 vhold(vd->mv_vnode); 779 sx_xunlock(&mqfs->mi_lock); 780 781 vgone(newvpp); 782 vput(newvpp); 783 goto found; 784 } 785 } 786 787 *vpp = newvpp; 788 789 vd = uma_zalloc(mvdata_zone, M_WAITOK); 790 (*vpp)->v_data = vd; 791 vd->mv_vnode = *vpp; 792 vd->mv_node = pn; 793 TASK_INIT(&vd->mv_task, 0, do_recycle, *vpp); 794 LIST_INSERT_HEAD(&pn->mn_vnodes, vd, mv_link); 795 mqnode_addref(pn); 796 switch (pn->mn_type) { 797 case mqfstype_root: 798 (*vpp)->v_vflag = VV_ROOT; 799 /* fall through */ 800 case mqfstype_dir: 801 case mqfstype_this: 802 case mqfstype_parent: 803 (*vpp)->v_type = VDIR; 804 break; 805 case mqfstype_file: 806 (*vpp)->v_type = VREG; 807 break; 808 case mqfstype_symlink: 809 (*vpp)->v_type = VLNK; 810 break; 811 case mqfstype_none: 812 KASSERT(0, ("mqfs_allocf called for null node\n")); 813 default: 814 panic("%s has unexpected type: %d", pn->mn_name, pn->mn_type); 815 } 816 sx_xunlock(&mqfs->mi_lock); 817 return (0); 818 } 819 820 /* 821 * Search a directory entry 822 */ 823 static struct mqfs_node * 824 mqfs_search(struct mqfs_node *pd, const char *name, int len, struct ucred *cred) 825 { 826 struct mqfs_node *pn; 827 const void *pr_root; 828 829 sx_assert(&pd->mn_info->mi_lock, SX_LOCKED); 830 pr_root = cred->cr_prison->pr_root; 831 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) { 832 /* Only match names within the same prison root directory */ 833 if ((pn->mn_pr_root == NULL || pn->mn_pr_root == pr_root) && 834 strncmp(pn->mn_name, name, len) == 0 && 835 pn->mn_name[len] == '\0') 836 return (pn); 837 } 838 return (NULL); 839 } 840 841 /* 842 * Look up a file or directory. 843 */ 844 static int 845 mqfs_lookupx(struct vop_cachedlookup_args *ap) 846 { 847 struct componentname *cnp; 848 struct vnode *dvp, **vpp; 849 struct mqfs_node *pd; 850 struct mqfs_node *pn; 851 struct mqfs_info *mqfs; 852 int nameiop, flags, error, namelen; 853 char *pname; 854 struct thread *td; 855 856 cnp = ap->a_cnp; 857 vpp = ap->a_vpp; 858 dvp = ap->a_dvp; 859 pname = cnp->cn_nameptr; 860 namelen = cnp->cn_namelen; 861 td = cnp->cn_thread; 862 flags = cnp->cn_flags; 863 nameiop = cnp->cn_nameiop; 864 pd = VTON(dvp); 865 pn = NULL; 866 mqfs = pd->mn_info; 867 *vpp = NULLVP; 868 869 if (dvp->v_type != VDIR) 870 return (ENOTDIR); 871 872 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 873 if (error) 874 return (error); 875 876 /* shortcut: check if the name is too long */ 877 if (cnp->cn_namelen >= MQFS_NAMELEN) 878 return (ENOENT); 879 880 /* self */ 881 if (namelen == 1 && pname[0] == '.') { 882 if ((flags & ISLASTCN) && nameiop != LOOKUP) 883 return (EINVAL); 884 pn = pd; 885 *vpp = dvp; 886 VREF(dvp); 887 return (0); 888 } 889 890 /* parent */ 891 if (cnp->cn_flags & ISDOTDOT) { 892 if (dvp->v_vflag & VV_ROOT) 893 return (EIO); 894 if ((flags & ISLASTCN) && nameiop != LOOKUP) 895 return (EINVAL); 896 VOP_UNLOCK(dvp, 0); 897 KASSERT(pd->mn_parent, ("non-root directory has no parent")); 898 pn = pd->mn_parent; 899 error = mqfs_allocv(dvp->v_mount, vpp, pn); 900 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 901 return (error); 902 } 903 904 /* named node */ 905 sx_xlock(&mqfs->mi_lock); 906 pn = mqfs_search(pd, pname, namelen, cnp->cn_cred); 907 if (pn != NULL) 908 mqnode_addref(pn); 909 sx_xunlock(&mqfs->mi_lock); 910 911 /* found */ 912 if (pn != NULL) { 913 /* DELETE */ 914 if (nameiop == DELETE && (flags & ISLASTCN)) { 915 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 916 if (error) { 917 mqnode_release(pn); 918 return (error); 919 } 920 if (*vpp == dvp) { 921 VREF(dvp); 922 *vpp = dvp; 923 mqnode_release(pn); 924 return (0); 925 } 926 } 927 928 /* allocate vnode */ 929 error = mqfs_allocv(dvp->v_mount, vpp, pn); 930 mqnode_release(pn); 931 if (error == 0 && cnp->cn_flags & MAKEENTRY) 932 cache_enter(dvp, *vpp, cnp); 933 return (error); 934 } 935 936 /* not found */ 937 938 /* will create a new entry in the directory ? */ 939 if ((nameiop == CREATE || nameiop == RENAME) && (flags & LOCKPARENT) 940 && (flags & ISLASTCN)) { 941 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 942 if (error) 943 return (error); 944 cnp->cn_flags |= SAVENAME; 945 return (EJUSTRETURN); 946 } 947 return (ENOENT); 948 } 949 950 #if 0 951 struct vop_lookup_args { 952 struct vop_generic_args a_gen; 953 struct vnode *a_dvp; 954 struct vnode **a_vpp; 955 struct componentname *a_cnp; 956 }; 957 #endif 958 959 /* 960 * vnode lookup operation 961 */ 962 static int 963 mqfs_lookup(struct vop_cachedlookup_args *ap) 964 { 965 int rc; 966 967 rc = mqfs_lookupx(ap); 968 return (rc); 969 } 970 971 #if 0 972 struct vop_create_args { 973 struct vnode *a_dvp; 974 struct vnode **a_vpp; 975 struct componentname *a_cnp; 976 struct vattr *a_vap; 977 }; 978 #endif 979 980 /* 981 * vnode creation operation 982 */ 983 static int 984 mqfs_create(struct vop_create_args *ap) 985 { 986 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 987 struct componentname *cnp = ap->a_cnp; 988 struct mqfs_node *pd; 989 struct mqfs_node *pn; 990 struct mqueue *mq; 991 int error; 992 993 pd = VTON(ap->a_dvp); 994 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir) 995 return (ENOTDIR); 996 mq = mqueue_alloc(NULL); 997 if (mq == NULL) 998 return (EAGAIN); 999 sx_xlock(&mqfs->mi_lock); 1000 if ((cnp->cn_flags & HASBUF) == 0) 1001 panic("%s: no name", __func__); 1002 pn = mqfs_create_file(pd, cnp->cn_nameptr, cnp->cn_namelen, 1003 cnp->cn_cred, ap->a_vap->va_mode); 1004 if (pn == NULL) { 1005 sx_xunlock(&mqfs->mi_lock); 1006 error = ENOSPC; 1007 } else { 1008 mqnode_addref(pn); 1009 sx_xunlock(&mqfs->mi_lock); 1010 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn); 1011 mqnode_release(pn); 1012 if (error) 1013 mqfs_destroy(pn); 1014 else 1015 pn->mn_data = mq; 1016 } 1017 if (error) 1018 mqueue_free(mq); 1019 return (error); 1020 } 1021 1022 /* 1023 * Remove an entry 1024 */ 1025 static 1026 int do_unlink(struct mqfs_node *pn, struct ucred *ucred) 1027 { 1028 struct mqfs_node *parent; 1029 struct mqfs_vdata *vd; 1030 int error = 0; 1031 1032 sx_assert(&pn->mn_info->mi_lock, SX_LOCKED); 1033 1034 if (ucred->cr_uid != pn->mn_uid && 1035 (error = priv_check_cred(ucred, PRIV_MQ_ADMIN, 0)) != 0) 1036 error = EACCES; 1037 else if (!pn->mn_deleted) { 1038 parent = pn->mn_parent; 1039 pn->mn_parent = NULL; 1040 pn->mn_deleted = 1; 1041 LIST_REMOVE(pn, mn_sibling); 1042 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) { 1043 cache_purge(vd->mv_vnode); 1044 vhold(vd->mv_vnode); 1045 taskqueue_enqueue(taskqueue_thread, &vd->mv_task); 1046 } 1047 mqnode_release(pn); 1048 mqnode_release(parent); 1049 } else 1050 error = ENOENT; 1051 return (error); 1052 } 1053 1054 #if 0 1055 struct vop_remove_args { 1056 struct vnode *a_dvp; 1057 struct vnode *a_vp; 1058 struct componentname *a_cnp; 1059 }; 1060 #endif 1061 1062 /* 1063 * vnode removal operation 1064 */ 1065 static int 1066 mqfs_remove(struct vop_remove_args *ap) 1067 { 1068 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 1069 struct mqfs_node *pn; 1070 int error; 1071 1072 if (ap->a_vp->v_type == VDIR) 1073 return (EPERM); 1074 pn = VTON(ap->a_vp); 1075 sx_xlock(&mqfs->mi_lock); 1076 error = do_unlink(pn, ap->a_cnp->cn_cred); 1077 sx_xunlock(&mqfs->mi_lock); 1078 return (error); 1079 } 1080 1081 #if 0 1082 struct vop_inactive_args { 1083 struct vnode *a_vp; 1084 struct thread *a_td; 1085 }; 1086 #endif 1087 1088 static int 1089 mqfs_inactive(struct vop_inactive_args *ap) 1090 { 1091 struct mqfs_node *pn = VTON(ap->a_vp); 1092 1093 if (pn->mn_deleted) 1094 vrecycle(ap->a_vp); 1095 return (0); 1096 } 1097 1098 #if 0 1099 struct vop_reclaim_args { 1100 struct vop_generic_args a_gen; 1101 struct vnode *a_vp; 1102 struct thread *a_td; 1103 }; 1104 #endif 1105 1106 static int 1107 mqfs_reclaim(struct vop_reclaim_args *ap) 1108 { 1109 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_vp->v_mount); 1110 struct vnode *vp = ap->a_vp; 1111 struct mqfs_node *pn; 1112 struct mqfs_vdata *vd; 1113 1114 vd = vp->v_data; 1115 pn = vd->mv_node; 1116 sx_xlock(&mqfs->mi_lock); 1117 vp->v_data = NULL; 1118 LIST_REMOVE(vd, mv_link); 1119 uma_zfree(mvdata_zone, vd); 1120 mqnode_release(pn); 1121 sx_xunlock(&mqfs->mi_lock); 1122 return (0); 1123 } 1124 1125 #if 0 1126 struct vop_open_args { 1127 struct vop_generic_args a_gen; 1128 struct vnode *a_vp; 1129 int a_mode; 1130 struct ucred *a_cred; 1131 struct thread *a_td; 1132 struct file *a_fp; 1133 }; 1134 #endif 1135 1136 static int 1137 mqfs_open(struct vop_open_args *ap) 1138 { 1139 return (0); 1140 } 1141 1142 #if 0 1143 struct vop_close_args { 1144 struct vop_generic_args a_gen; 1145 struct vnode *a_vp; 1146 int a_fflag; 1147 struct ucred *a_cred; 1148 struct thread *a_td; 1149 }; 1150 #endif 1151 1152 static int 1153 mqfs_close(struct vop_close_args *ap) 1154 { 1155 return (0); 1156 } 1157 1158 #if 0 1159 struct vop_access_args { 1160 struct vop_generic_args a_gen; 1161 struct vnode *a_vp; 1162 accmode_t a_accmode; 1163 struct ucred *a_cred; 1164 struct thread *a_td; 1165 }; 1166 #endif 1167 1168 /* 1169 * Verify permissions 1170 */ 1171 static int 1172 mqfs_access(struct vop_access_args *ap) 1173 { 1174 struct vnode *vp = ap->a_vp; 1175 struct vattr vattr; 1176 int error; 1177 1178 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 1179 if (error) 1180 return (error); 1181 error = vaccess(vp->v_type, vattr.va_mode, vattr.va_uid, 1182 vattr.va_gid, ap->a_accmode, ap->a_cred, NULL); 1183 return (error); 1184 } 1185 1186 #if 0 1187 struct vop_getattr_args { 1188 struct vop_generic_args a_gen; 1189 struct vnode *a_vp; 1190 struct vattr *a_vap; 1191 struct ucred *a_cred; 1192 }; 1193 #endif 1194 1195 /* 1196 * Get file attributes 1197 */ 1198 static int 1199 mqfs_getattr(struct vop_getattr_args *ap) 1200 { 1201 struct vnode *vp = ap->a_vp; 1202 struct mqfs_node *pn = VTON(vp); 1203 struct vattr *vap = ap->a_vap; 1204 int error = 0; 1205 1206 vap->va_type = vp->v_type; 1207 vap->va_mode = pn->mn_mode; 1208 vap->va_nlink = 1; 1209 vap->va_uid = pn->mn_uid; 1210 vap->va_gid = pn->mn_gid; 1211 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 1212 vap->va_fileid = pn->mn_fileno; 1213 vap->va_size = 0; 1214 vap->va_blocksize = PAGE_SIZE; 1215 vap->va_bytes = vap->va_size = 0; 1216 vap->va_atime = pn->mn_atime; 1217 vap->va_mtime = pn->mn_mtime; 1218 vap->va_ctime = pn->mn_ctime; 1219 vap->va_birthtime = pn->mn_birth; 1220 vap->va_gen = 0; 1221 vap->va_flags = 0; 1222 vap->va_rdev = NODEV; 1223 vap->va_bytes = 0; 1224 vap->va_filerev = 0; 1225 return (error); 1226 } 1227 1228 #if 0 1229 struct vop_setattr_args { 1230 struct vop_generic_args a_gen; 1231 struct vnode *a_vp; 1232 struct vattr *a_vap; 1233 struct ucred *a_cred; 1234 }; 1235 #endif 1236 /* 1237 * Set attributes 1238 */ 1239 static int 1240 mqfs_setattr(struct vop_setattr_args *ap) 1241 { 1242 struct mqfs_node *pn; 1243 struct vattr *vap; 1244 struct vnode *vp; 1245 struct thread *td; 1246 int c, error; 1247 uid_t uid; 1248 gid_t gid; 1249 1250 td = curthread; 1251 vap = ap->a_vap; 1252 vp = ap->a_vp; 1253 if ((vap->va_type != VNON) || 1254 (vap->va_nlink != VNOVAL) || 1255 (vap->va_fsid != VNOVAL) || 1256 (vap->va_fileid != VNOVAL) || 1257 (vap->va_blocksize != VNOVAL) || 1258 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1259 (vap->va_rdev != VNOVAL) || 1260 ((int)vap->va_bytes != VNOVAL) || 1261 (vap->va_gen != VNOVAL)) { 1262 return (EINVAL); 1263 } 1264 1265 pn = VTON(vp); 1266 1267 error = c = 0; 1268 if (vap->va_uid == (uid_t)VNOVAL) 1269 uid = pn->mn_uid; 1270 else 1271 uid = vap->va_uid; 1272 if (vap->va_gid == (gid_t)VNOVAL) 1273 gid = pn->mn_gid; 1274 else 1275 gid = vap->va_gid; 1276 1277 if (uid != pn->mn_uid || gid != pn->mn_gid) { 1278 /* 1279 * To modify the ownership of a file, must possess VADMIN 1280 * for that file. 1281 */ 1282 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td))) 1283 return (error); 1284 1285 /* 1286 * XXXRW: Why is there a privilege check here: shouldn't the 1287 * check in VOP_ACCESS() be enough? Also, are the group bits 1288 * below definitely right? 1289 */ 1290 if (((ap->a_cred->cr_uid != pn->mn_uid) || uid != pn->mn_uid || 1291 (gid != pn->mn_gid && !groupmember(gid, ap->a_cred))) && 1292 (error = priv_check(td, PRIV_MQ_ADMIN)) != 0) 1293 return (error); 1294 pn->mn_uid = uid; 1295 pn->mn_gid = gid; 1296 c = 1; 1297 } 1298 1299 if (vap->va_mode != (mode_t)VNOVAL) { 1300 if ((ap->a_cred->cr_uid != pn->mn_uid) && 1301 (error = priv_check(td, PRIV_MQ_ADMIN))) 1302 return (error); 1303 pn->mn_mode = vap->va_mode; 1304 c = 1; 1305 } 1306 1307 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1308 /* See the comment in ufs_vnops::ufs_setattr(). */ 1309 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)) && 1310 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 1311 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, td)))) 1312 return (error); 1313 if (vap->va_atime.tv_sec != VNOVAL) { 1314 pn->mn_atime = vap->va_atime; 1315 } 1316 if (vap->va_mtime.tv_sec != VNOVAL) { 1317 pn->mn_mtime = vap->va_mtime; 1318 } 1319 c = 1; 1320 } 1321 if (c) { 1322 vfs_timestamp(&pn->mn_ctime); 1323 } 1324 return (0); 1325 } 1326 1327 #if 0 1328 struct vop_read_args { 1329 struct vop_generic_args a_gen; 1330 struct vnode *a_vp; 1331 struct uio *a_uio; 1332 int a_ioflag; 1333 struct ucred *a_cred; 1334 }; 1335 #endif 1336 1337 /* 1338 * Read from a file 1339 */ 1340 static int 1341 mqfs_read(struct vop_read_args *ap) 1342 { 1343 char buf[80]; 1344 struct vnode *vp = ap->a_vp; 1345 struct uio *uio = ap->a_uio; 1346 struct mqueue *mq; 1347 int len, error; 1348 1349 if (vp->v_type != VREG) 1350 return (EINVAL); 1351 1352 mq = VTOMQ(vp); 1353 snprintf(buf, sizeof(buf), 1354 "QSIZE:%-10ld MAXMSG:%-10ld CURMSG:%-10ld MSGSIZE:%-10ld\n", 1355 mq->mq_totalbytes, 1356 mq->mq_maxmsg, 1357 mq->mq_curmsgs, 1358 mq->mq_msgsize); 1359 buf[sizeof(buf)-1] = '\0'; 1360 len = strlen(buf); 1361 error = uiomove_frombuf(buf, len, uio); 1362 return (error); 1363 } 1364 1365 #if 0 1366 struct vop_readdir_args { 1367 struct vop_generic_args a_gen; 1368 struct vnode *a_vp; 1369 struct uio *a_uio; 1370 struct ucred *a_cred; 1371 int *a_eofflag; 1372 int *a_ncookies; 1373 u_long **a_cookies; 1374 }; 1375 #endif 1376 1377 /* 1378 * Return directory entries. 1379 */ 1380 static int 1381 mqfs_readdir(struct vop_readdir_args *ap) 1382 { 1383 struct vnode *vp; 1384 struct mqfs_info *mi; 1385 struct mqfs_node *pd; 1386 struct mqfs_node *pn; 1387 struct dirent entry; 1388 struct uio *uio; 1389 const void *pr_root; 1390 int *tmp_ncookies = NULL; 1391 off_t offset; 1392 int error, i; 1393 1394 vp = ap->a_vp; 1395 mi = VFSTOMQFS(vp->v_mount); 1396 pd = VTON(vp); 1397 uio = ap->a_uio; 1398 1399 if (vp->v_type != VDIR) 1400 return (ENOTDIR); 1401 1402 if (uio->uio_offset < 0) 1403 return (EINVAL); 1404 1405 if (ap->a_ncookies != NULL) { 1406 tmp_ncookies = ap->a_ncookies; 1407 *ap->a_ncookies = 0; 1408 ap->a_ncookies = NULL; 1409 } 1410 1411 error = 0; 1412 offset = 0; 1413 1414 pr_root = ap->a_cred->cr_prison->pr_root; 1415 sx_xlock(&mi->mi_lock); 1416 1417 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) { 1418 entry.d_reclen = sizeof(entry); 1419 1420 /* 1421 * Only show names within the same prison root directory 1422 * (or not associated with a prison, e.g. "." and ".."). 1423 */ 1424 if (pn->mn_pr_root != NULL && pn->mn_pr_root != pr_root) 1425 continue; 1426 if (!pn->mn_fileno) 1427 mqfs_fileno_alloc(mi, pn); 1428 entry.d_fileno = pn->mn_fileno; 1429 for (i = 0; i < MQFS_NAMELEN - 1 && pn->mn_name[i] != '\0'; ++i) 1430 entry.d_name[i] = pn->mn_name[i]; 1431 entry.d_name[i] = 0; 1432 entry.d_namlen = i; 1433 switch (pn->mn_type) { 1434 case mqfstype_root: 1435 case mqfstype_dir: 1436 case mqfstype_this: 1437 case mqfstype_parent: 1438 entry.d_type = DT_DIR; 1439 break; 1440 case mqfstype_file: 1441 entry.d_type = DT_REG; 1442 break; 1443 case mqfstype_symlink: 1444 entry.d_type = DT_LNK; 1445 break; 1446 default: 1447 panic("%s has unexpected node type: %d", pn->mn_name, 1448 pn->mn_type); 1449 } 1450 if (entry.d_reclen > uio->uio_resid) 1451 break; 1452 if (offset >= uio->uio_offset) { 1453 error = vfs_read_dirent(ap, &entry, offset); 1454 if (error) 1455 break; 1456 } 1457 offset += entry.d_reclen; 1458 } 1459 sx_xunlock(&mi->mi_lock); 1460 1461 uio->uio_offset = offset; 1462 1463 if (tmp_ncookies != NULL) 1464 ap->a_ncookies = tmp_ncookies; 1465 1466 return (error); 1467 } 1468 1469 #ifdef notyet 1470 1471 #if 0 1472 struct vop_mkdir_args { 1473 struct vnode *a_dvp; 1474 struvt vnode **a_vpp; 1475 struvt componentname *a_cnp; 1476 struct vattr *a_vap; 1477 }; 1478 #endif 1479 1480 /* 1481 * Create a directory. 1482 */ 1483 static int 1484 mqfs_mkdir(struct vop_mkdir_args *ap) 1485 { 1486 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 1487 struct componentname *cnp = ap->a_cnp; 1488 struct mqfs_node *pd = VTON(ap->a_dvp); 1489 struct mqfs_node *pn; 1490 int error; 1491 1492 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir) 1493 return (ENOTDIR); 1494 sx_xlock(&mqfs->mi_lock); 1495 if ((cnp->cn_flags & HASBUF) == 0) 1496 panic("%s: no name", __func__); 1497 pn = mqfs_create_dir(pd, cnp->cn_nameptr, cnp->cn_namelen, 1498 ap->a_vap->cn_cred, ap->a_vap->va_mode); 1499 if (pn != NULL) 1500 mqnode_addref(pn); 1501 sx_xunlock(&mqfs->mi_lock); 1502 if (pn == NULL) { 1503 error = ENOSPC; 1504 } else { 1505 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn); 1506 mqnode_release(pn); 1507 } 1508 return (error); 1509 } 1510 1511 #if 0 1512 struct vop_rmdir_args { 1513 struct vnode *a_dvp; 1514 struct vnode *a_vp; 1515 struct componentname *a_cnp; 1516 }; 1517 #endif 1518 1519 /* 1520 * Remove a directory. 1521 */ 1522 static int 1523 mqfs_rmdir(struct vop_rmdir_args *ap) 1524 { 1525 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 1526 struct mqfs_node *pn = VTON(ap->a_vp); 1527 struct mqfs_node *pt; 1528 1529 if (pn->mn_type != mqfstype_dir) 1530 return (ENOTDIR); 1531 1532 sx_xlock(&mqfs->mi_lock); 1533 if (pn->mn_deleted) { 1534 sx_xunlock(&mqfs->mi_lock); 1535 return (ENOENT); 1536 } 1537 1538 pt = LIST_FIRST(&pn->mn_children); 1539 pt = LIST_NEXT(pt, mn_sibling); 1540 pt = LIST_NEXT(pt, mn_sibling); 1541 if (pt != NULL) { 1542 sx_xunlock(&mqfs->mi_lock); 1543 return (ENOTEMPTY); 1544 } 1545 pt = pn->mn_parent; 1546 pn->mn_parent = NULL; 1547 pn->mn_deleted = 1; 1548 LIST_REMOVE(pn, mn_sibling); 1549 mqnode_release(pn); 1550 mqnode_release(pt); 1551 sx_xunlock(&mqfs->mi_lock); 1552 cache_purge(ap->a_vp); 1553 return (0); 1554 } 1555 1556 #endif /* notyet */ 1557 1558 /* 1559 * See if this prison root is obsolete, and clean up associated queues if it is. 1560 */ 1561 static int 1562 mqfs_prison_remove(void *obj, void *data __unused) 1563 { 1564 const struct prison *pr = obj; 1565 const struct prison *tpr; 1566 struct mqfs_node *pn, *tpn; 1567 int found; 1568 1569 found = 0; 1570 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1571 if (tpr->pr_root == pr->pr_root && tpr != pr && tpr->pr_ref > 0) 1572 found = 1; 1573 } 1574 if (!found) { 1575 /* 1576 * No jails are rooted in this directory anymore, 1577 * so no queues should be either. 1578 */ 1579 sx_xlock(&mqfs_data.mi_lock); 1580 LIST_FOREACH_SAFE(pn, &mqfs_data.mi_root->mn_children, 1581 mn_sibling, tpn) { 1582 if (pn->mn_pr_root == pr->pr_root) 1583 (void)do_unlink(pn, curthread->td_ucred); 1584 } 1585 sx_xunlock(&mqfs_data.mi_lock); 1586 } 1587 return (0); 1588 } 1589 1590 /* 1591 * Allocate a message queue 1592 */ 1593 static struct mqueue * 1594 mqueue_alloc(const struct mq_attr *attr) 1595 { 1596 struct mqueue *mq; 1597 1598 if (curmq >= maxmq) 1599 return (NULL); 1600 mq = uma_zalloc(mqueue_zone, M_WAITOK | M_ZERO); 1601 TAILQ_INIT(&mq->mq_msgq); 1602 if (attr != NULL) { 1603 mq->mq_maxmsg = attr->mq_maxmsg; 1604 mq->mq_msgsize = attr->mq_msgsize; 1605 } else { 1606 mq->mq_maxmsg = default_maxmsg; 1607 mq->mq_msgsize = default_msgsize; 1608 } 1609 mtx_init(&mq->mq_mutex, "mqueue lock", NULL, MTX_DEF); 1610 knlist_init_mtx(&mq->mq_rsel.si_note, &mq->mq_mutex); 1611 knlist_init_mtx(&mq->mq_wsel.si_note, &mq->mq_mutex); 1612 atomic_add_int(&curmq, 1); 1613 return (mq); 1614 } 1615 1616 /* 1617 * Destroy a message queue 1618 */ 1619 static void 1620 mqueue_free(struct mqueue *mq) 1621 { 1622 struct mqueue_msg *msg; 1623 1624 while ((msg = TAILQ_FIRST(&mq->mq_msgq)) != NULL) { 1625 TAILQ_REMOVE(&mq->mq_msgq, msg, msg_link); 1626 free(msg, M_MQUEUEDATA); 1627 } 1628 1629 mtx_destroy(&mq->mq_mutex); 1630 seldrain(&mq->mq_rsel); 1631 seldrain(&mq->mq_wsel); 1632 knlist_destroy(&mq->mq_rsel.si_note); 1633 knlist_destroy(&mq->mq_wsel.si_note); 1634 uma_zfree(mqueue_zone, mq); 1635 atomic_add_int(&curmq, -1); 1636 } 1637 1638 /* 1639 * Load a message from user space 1640 */ 1641 static struct mqueue_msg * 1642 mqueue_loadmsg(const char *msg_ptr, size_t msg_size, int msg_prio) 1643 { 1644 struct mqueue_msg *msg; 1645 size_t len; 1646 int error; 1647 1648 len = sizeof(struct mqueue_msg) + msg_size; 1649 msg = malloc(len, M_MQUEUEDATA, M_WAITOK); 1650 error = copyin(msg_ptr, ((char *)msg) + sizeof(struct mqueue_msg), 1651 msg_size); 1652 if (error) { 1653 free(msg, M_MQUEUEDATA); 1654 msg = NULL; 1655 } else { 1656 msg->msg_size = msg_size; 1657 msg->msg_prio = msg_prio; 1658 } 1659 return (msg); 1660 } 1661 1662 /* 1663 * Save a message to user space 1664 */ 1665 static int 1666 mqueue_savemsg(struct mqueue_msg *msg, char *msg_ptr, int *msg_prio) 1667 { 1668 int error; 1669 1670 error = copyout(((char *)msg) + sizeof(*msg), msg_ptr, 1671 msg->msg_size); 1672 if (error == 0 && msg_prio != NULL) 1673 error = copyout(&msg->msg_prio, msg_prio, sizeof(int)); 1674 return (error); 1675 } 1676 1677 /* 1678 * Free a message's memory 1679 */ 1680 static __inline void 1681 mqueue_freemsg(struct mqueue_msg *msg) 1682 { 1683 free(msg, M_MQUEUEDATA); 1684 } 1685 1686 /* 1687 * Send a message. if waitok is false, thread will not be 1688 * blocked if there is no data in queue, otherwise, absolute 1689 * time will be checked. 1690 */ 1691 int 1692 mqueue_send(struct mqueue *mq, const char *msg_ptr, 1693 size_t msg_len, unsigned msg_prio, int waitok, 1694 const struct timespec *abs_timeout) 1695 { 1696 struct mqueue_msg *msg; 1697 struct timespec ts, ts2; 1698 struct timeval tv; 1699 int error; 1700 1701 if (msg_prio >= MQ_PRIO_MAX) 1702 return (EINVAL); 1703 if (msg_len > mq->mq_msgsize) 1704 return (EMSGSIZE); 1705 msg = mqueue_loadmsg(msg_ptr, msg_len, msg_prio); 1706 if (msg == NULL) 1707 return (EFAULT); 1708 1709 /* O_NONBLOCK case */ 1710 if (!waitok) { 1711 error = _mqueue_send(mq, msg, -1); 1712 if (error) 1713 goto bad; 1714 return (0); 1715 } 1716 1717 /* we allow a null timeout (wait forever) */ 1718 if (abs_timeout == NULL) { 1719 error = _mqueue_send(mq, msg, 0); 1720 if (error) 1721 goto bad; 1722 return (0); 1723 } 1724 1725 /* send it before checking time */ 1726 error = _mqueue_send(mq, msg, -1); 1727 if (error == 0) 1728 return (0); 1729 1730 if (error != EAGAIN) 1731 goto bad; 1732 1733 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) { 1734 error = EINVAL; 1735 goto bad; 1736 } 1737 for (;;) { 1738 getnanotime(&ts); 1739 timespecsub(abs_timeout, &ts, &ts2); 1740 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) { 1741 error = ETIMEDOUT; 1742 break; 1743 } 1744 TIMESPEC_TO_TIMEVAL(&tv, &ts2); 1745 error = _mqueue_send(mq, msg, tvtohz(&tv)); 1746 if (error != ETIMEDOUT) 1747 break; 1748 } 1749 if (error == 0) 1750 return (0); 1751 bad: 1752 mqueue_freemsg(msg); 1753 return (error); 1754 } 1755 1756 /* 1757 * Common routine to send a message 1758 */ 1759 static int 1760 _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, int timo) 1761 { 1762 struct mqueue_msg *msg2; 1763 int error = 0; 1764 1765 mtx_lock(&mq->mq_mutex); 1766 while (mq->mq_curmsgs >= mq->mq_maxmsg && error == 0) { 1767 if (timo < 0) { 1768 mtx_unlock(&mq->mq_mutex); 1769 return (EAGAIN); 1770 } 1771 mq->mq_senders++; 1772 error = msleep(&mq->mq_senders, &mq->mq_mutex, 1773 PCATCH, "mqsend", timo); 1774 mq->mq_senders--; 1775 if (error == EAGAIN) 1776 error = ETIMEDOUT; 1777 } 1778 if (mq->mq_curmsgs >= mq->mq_maxmsg) { 1779 mtx_unlock(&mq->mq_mutex); 1780 return (error); 1781 } 1782 error = 0; 1783 if (TAILQ_EMPTY(&mq->mq_msgq)) { 1784 TAILQ_INSERT_HEAD(&mq->mq_msgq, msg, msg_link); 1785 } else { 1786 if (msg->msg_prio <= TAILQ_LAST(&mq->mq_msgq, msgq)->msg_prio) { 1787 TAILQ_INSERT_TAIL(&mq->mq_msgq, msg, msg_link); 1788 } else { 1789 TAILQ_FOREACH(msg2, &mq->mq_msgq, msg_link) { 1790 if (msg2->msg_prio < msg->msg_prio) 1791 break; 1792 } 1793 TAILQ_INSERT_BEFORE(msg2, msg, msg_link); 1794 } 1795 } 1796 mq->mq_curmsgs++; 1797 mq->mq_totalbytes += msg->msg_size; 1798 if (mq->mq_receivers) 1799 wakeup_one(&mq->mq_receivers); 1800 else if (mq->mq_notifier != NULL) 1801 mqueue_send_notification(mq); 1802 if (mq->mq_flags & MQ_RSEL) { 1803 mq->mq_flags &= ~MQ_RSEL; 1804 selwakeup(&mq->mq_rsel); 1805 } 1806 KNOTE_LOCKED(&mq->mq_rsel.si_note, 0); 1807 mtx_unlock(&mq->mq_mutex); 1808 return (0); 1809 } 1810 1811 /* 1812 * Send realtime a signal to process which registered itself 1813 * successfully by mq_notify. 1814 */ 1815 static void 1816 mqueue_send_notification(struct mqueue *mq) 1817 { 1818 struct mqueue_notifier *nt; 1819 struct thread *td; 1820 struct proc *p; 1821 int error; 1822 1823 mtx_assert(&mq->mq_mutex, MA_OWNED); 1824 nt = mq->mq_notifier; 1825 if (nt->nt_sigev.sigev_notify != SIGEV_NONE) { 1826 p = nt->nt_proc; 1827 error = sigev_findtd(p, &nt->nt_sigev, &td); 1828 if (error) { 1829 mq->mq_notifier = NULL; 1830 return; 1831 } 1832 if (!KSI_ONQ(&nt->nt_ksi)) { 1833 ksiginfo_set_sigev(&nt->nt_ksi, &nt->nt_sigev); 1834 tdsendsignal(p, td, nt->nt_ksi.ksi_signo, &nt->nt_ksi); 1835 } 1836 PROC_UNLOCK(p); 1837 } 1838 mq->mq_notifier = NULL; 1839 } 1840 1841 /* 1842 * Get a message. if waitok is false, thread will not be 1843 * blocked if there is no data in queue, otherwise, absolute 1844 * time will be checked. 1845 */ 1846 int 1847 mqueue_receive(struct mqueue *mq, char *msg_ptr, 1848 size_t msg_len, unsigned *msg_prio, int waitok, 1849 const struct timespec *abs_timeout) 1850 { 1851 struct mqueue_msg *msg; 1852 struct timespec ts, ts2; 1853 struct timeval tv; 1854 int error; 1855 1856 if (msg_len < mq->mq_msgsize) 1857 return (EMSGSIZE); 1858 1859 /* O_NONBLOCK case */ 1860 if (!waitok) { 1861 error = _mqueue_recv(mq, &msg, -1); 1862 if (error) 1863 return (error); 1864 goto received; 1865 } 1866 1867 /* we allow a null timeout (wait forever). */ 1868 if (abs_timeout == NULL) { 1869 error = _mqueue_recv(mq, &msg, 0); 1870 if (error) 1871 return (error); 1872 goto received; 1873 } 1874 1875 /* try to get a message before checking time */ 1876 error = _mqueue_recv(mq, &msg, -1); 1877 if (error == 0) 1878 goto received; 1879 1880 if (error != EAGAIN) 1881 return (error); 1882 1883 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) { 1884 error = EINVAL; 1885 return (error); 1886 } 1887 1888 for (;;) { 1889 getnanotime(&ts); 1890 timespecsub(abs_timeout, &ts, &ts2); 1891 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) { 1892 error = ETIMEDOUT; 1893 return (error); 1894 } 1895 TIMESPEC_TO_TIMEVAL(&tv, &ts2); 1896 error = _mqueue_recv(mq, &msg, tvtohz(&tv)); 1897 if (error == 0) 1898 break; 1899 if (error != ETIMEDOUT) 1900 return (error); 1901 } 1902 1903 received: 1904 error = mqueue_savemsg(msg, msg_ptr, msg_prio); 1905 if (error == 0) { 1906 curthread->td_retval[0] = msg->msg_size; 1907 curthread->td_retval[1] = 0; 1908 } 1909 mqueue_freemsg(msg); 1910 return (error); 1911 } 1912 1913 /* 1914 * Common routine to receive a message 1915 */ 1916 static int 1917 _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, int timo) 1918 { 1919 int error = 0; 1920 1921 mtx_lock(&mq->mq_mutex); 1922 while ((*msg = TAILQ_FIRST(&mq->mq_msgq)) == NULL && error == 0) { 1923 if (timo < 0) { 1924 mtx_unlock(&mq->mq_mutex); 1925 return (EAGAIN); 1926 } 1927 mq->mq_receivers++; 1928 error = msleep(&mq->mq_receivers, &mq->mq_mutex, 1929 PCATCH, "mqrecv", timo); 1930 mq->mq_receivers--; 1931 if (error == EAGAIN) 1932 error = ETIMEDOUT; 1933 } 1934 if (*msg != NULL) { 1935 error = 0; 1936 TAILQ_REMOVE(&mq->mq_msgq, *msg, msg_link); 1937 mq->mq_curmsgs--; 1938 mq->mq_totalbytes -= (*msg)->msg_size; 1939 if (mq->mq_senders) 1940 wakeup_one(&mq->mq_senders); 1941 if (mq->mq_flags & MQ_WSEL) { 1942 mq->mq_flags &= ~MQ_WSEL; 1943 selwakeup(&mq->mq_wsel); 1944 } 1945 KNOTE_LOCKED(&mq->mq_wsel.si_note, 0); 1946 } 1947 if (mq->mq_notifier != NULL && mq->mq_receivers == 0 && 1948 !TAILQ_EMPTY(&mq->mq_msgq)) { 1949 mqueue_send_notification(mq); 1950 } 1951 mtx_unlock(&mq->mq_mutex); 1952 return (error); 1953 } 1954 1955 static __inline struct mqueue_notifier * 1956 notifier_alloc(void) 1957 { 1958 return (uma_zalloc(mqnoti_zone, M_WAITOK | M_ZERO)); 1959 } 1960 1961 static __inline void 1962 notifier_free(struct mqueue_notifier *p) 1963 { 1964 uma_zfree(mqnoti_zone, p); 1965 } 1966 1967 static struct mqueue_notifier * 1968 notifier_search(struct proc *p, int fd) 1969 { 1970 struct mqueue_notifier *nt; 1971 1972 LIST_FOREACH(nt, &p->p_mqnotifier, nt_link) { 1973 if (nt->nt_ksi.ksi_mqd == fd) 1974 break; 1975 } 1976 return (nt); 1977 } 1978 1979 static __inline void 1980 notifier_insert(struct proc *p, struct mqueue_notifier *nt) 1981 { 1982 LIST_INSERT_HEAD(&p->p_mqnotifier, nt, nt_link); 1983 } 1984 1985 static __inline void 1986 notifier_delete(struct proc *p, struct mqueue_notifier *nt) 1987 { 1988 LIST_REMOVE(nt, nt_link); 1989 notifier_free(nt); 1990 } 1991 1992 static void 1993 notifier_remove(struct proc *p, struct mqueue *mq, int fd) 1994 { 1995 struct mqueue_notifier *nt; 1996 1997 mtx_assert(&mq->mq_mutex, MA_OWNED); 1998 PROC_LOCK(p); 1999 nt = notifier_search(p, fd); 2000 if (nt != NULL) { 2001 if (mq->mq_notifier == nt) 2002 mq->mq_notifier = NULL; 2003 sigqueue_take(&nt->nt_ksi); 2004 notifier_delete(p, nt); 2005 } 2006 PROC_UNLOCK(p); 2007 } 2008 2009 static int 2010 kern_kmq_open(struct thread *td, const char *upath, int flags, mode_t mode, 2011 const struct mq_attr *attr) 2012 { 2013 char path[MQFS_NAMELEN + 1]; 2014 struct mqfs_node *pn; 2015 struct filedesc *fdp; 2016 struct file *fp; 2017 struct mqueue *mq; 2018 int fd, error, len, cmode; 2019 2020 AUDIT_ARG_FFLAGS(flags); 2021 AUDIT_ARG_MODE(mode); 2022 2023 fdp = td->td_proc->p_fd; 2024 cmode = (((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT); 2025 mq = NULL; 2026 if ((flags & O_CREAT) != 0 && attr != NULL) { 2027 if (attr->mq_maxmsg <= 0 || attr->mq_maxmsg > maxmsg) 2028 return (EINVAL); 2029 if (attr->mq_msgsize <= 0 || attr->mq_msgsize > maxmsgsize) 2030 return (EINVAL); 2031 } 2032 2033 error = copyinstr(upath, path, MQFS_NAMELEN + 1, NULL); 2034 if (error) 2035 return (error); 2036 2037 /* 2038 * The first character of name must be a slash (/) character 2039 * and the remaining characters of name cannot include any slash 2040 * characters. 2041 */ 2042 len = strlen(path); 2043 if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL) 2044 return (EINVAL); 2045 AUDIT_ARG_UPATH1_CANON(path); 2046 2047 error = falloc(td, &fp, &fd, O_CLOEXEC); 2048 if (error) 2049 return (error); 2050 2051 sx_xlock(&mqfs_data.mi_lock); 2052 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1, td->td_ucred); 2053 if (pn == NULL) { 2054 if (!(flags & O_CREAT)) { 2055 error = ENOENT; 2056 } else { 2057 mq = mqueue_alloc(attr); 2058 if (mq == NULL) { 2059 error = ENFILE; 2060 } else { 2061 pn = mqfs_create_file(mqfs_data.mi_root, 2062 path + 1, len - 1, td->td_ucred, 2063 cmode); 2064 if (pn == NULL) { 2065 error = ENOSPC; 2066 mqueue_free(mq); 2067 } 2068 } 2069 } 2070 2071 if (error == 0) { 2072 pn->mn_data = mq; 2073 } 2074 } else { 2075 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) { 2076 error = EEXIST; 2077 } else { 2078 accmode_t accmode = 0; 2079 2080 if (flags & FREAD) 2081 accmode |= VREAD; 2082 if (flags & FWRITE) 2083 accmode |= VWRITE; 2084 error = vaccess(VREG, pn->mn_mode, pn->mn_uid, 2085 pn->mn_gid, accmode, td->td_ucred, NULL); 2086 } 2087 } 2088 2089 if (error) { 2090 sx_xunlock(&mqfs_data.mi_lock); 2091 fdclose(td, fp, fd); 2092 fdrop(fp, td); 2093 return (error); 2094 } 2095 2096 mqnode_addref(pn); 2097 sx_xunlock(&mqfs_data.mi_lock); 2098 2099 finit(fp, flags & (FREAD | FWRITE | O_NONBLOCK), DTYPE_MQUEUE, pn, 2100 &mqueueops); 2101 2102 td->td_retval[0] = fd; 2103 fdrop(fp, td); 2104 return (0); 2105 } 2106 2107 /* 2108 * Syscall to open a message queue. 2109 */ 2110 int 2111 sys_kmq_open(struct thread *td, struct kmq_open_args *uap) 2112 { 2113 struct mq_attr attr; 2114 int flags, error; 2115 2116 if ((uap->flags & O_ACCMODE) == O_ACCMODE || uap->flags & O_EXEC) 2117 return (EINVAL); 2118 flags = FFLAGS(uap->flags); 2119 if ((flags & O_CREAT) != 0 && uap->attr != NULL) { 2120 error = copyin(uap->attr, &attr, sizeof(attr)); 2121 if (error) 2122 return (error); 2123 } 2124 return (kern_kmq_open(td, uap->path, flags, uap->mode, 2125 uap->attr != NULL ? &attr : NULL)); 2126 } 2127 2128 /* 2129 * Syscall to unlink a message queue. 2130 */ 2131 int 2132 sys_kmq_unlink(struct thread *td, struct kmq_unlink_args *uap) 2133 { 2134 char path[MQFS_NAMELEN+1]; 2135 struct mqfs_node *pn; 2136 int error, len; 2137 2138 error = copyinstr(uap->path, path, MQFS_NAMELEN + 1, NULL); 2139 if (error) 2140 return (error); 2141 2142 len = strlen(path); 2143 if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL) 2144 return (EINVAL); 2145 AUDIT_ARG_UPATH1_CANON(path); 2146 2147 sx_xlock(&mqfs_data.mi_lock); 2148 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1, td->td_ucred); 2149 if (pn != NULL) 2150 error = do_unlink(pn, td->td_ucred); 2151 else 2152 error = ENOENT; 2153 sx_xunlock(&mqfs_data.mi_lock); 2154 return (error); 2155 } 2156 2157 typedef int (*_fgetf)(struct thread *, int, cap_rights_t *, struct file **); 2158 2159 /* 2160 * Get message queue by giving file slot 2161 */ 2162 static int 2163 _getmq(struct thread *td, int fd, cap_rights_t *rightsp, _fgetf func, 2164 struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq) 2165 { 2166 struct mqfs_node *pn; 2167 int error; 2168 2169 error = func(td, fd, rightsp, fpp); 2170 if (error) 2171 return (error); 2172 if (&mqueueops != (*fpp)->f_ops) { 2173 fdrop(*fpp, td); 2174 return (EBADF); 2175 } 2176 pn = (*fpp)->f_data; 2177 if (ppn) 2178 *ppn = pn; 2179 if (pmq) 2180 *pmq = pn->mn_data; 2181 return (0); 2182 } 2183 2184 static __inline int 2185 getmq(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn, 2186 struct mqueue **pmq) 2187 { 2188 2189 return _getmq(td, fd, &cap_event_rights, fget, 2190 fpp, ppn, pmq); 2191 } 2192 2193 static __inline int 2194 getmq_read(struct thread *td, int fd, struct file **fpp, 2195 struct mqfs_node **ppn, struct mqueue **pmq) 2196 { 2197 2198 return _getmq(td, fd, &cap_read_rights, fget_read, 2199 fpp, ppn, pmq); 2200 } 2201 2202 static __inline int 2203 getmq_write(struct thread *td, int fd, struct file **fpp, 2204 struct mqfs_node **ppn, struct mqueue **pmq) 2205 { 2206 2207 return _getmq(td, fd, &cap_write_rights, fget_write, 2208 fpp, ppn, pmq); 2209 } 2210 2211 static int 2212 kern_kmq_setattr(struct thread *td, int mqd, const struct mq_attr *attr, 2213 struct mq_attr *oattr) 2214 { 2215 struct mqueue *mq; 2216 struct file *fp; 2217 u_int oflag, flag; 2218 int error; 2219 2220 AUDIT_ARG_FD(mqd); 2221 if (attr != NULL && (attr->mq_flags & ~O_NONBLOCK) != 0) 2222 return (EINVAL); 2223 error = getmq(td, mqd, &fp, NULL, &mq); 2224 if (error) 2225 return (error); 2226 oattr->mq_maxmsg = mq->mq_maxmsg; 2227 oattr->mq_msgsize = mq->mq_msgsize; 2228 oattr->mq_curmsgs = mq->mq_curmsgs; 2229 if (attr != NULL) { 2230 do { 2231 oflag = flag = fp->f_flag; 2232 flag &= ~O_NONBLOCK; 2233 flag |= (attr->mq_flags & O_NONBLOCK); 2234 } while (atomic_cmpset_int(&fp->f_flag, oflag, flag) == 0); 2235 } else 2236 oflag = fp->f_flag; 2237 oattr->mq_flags = (O_NONBLOCK & oflag); 2238 fdrop(fp, td); 2239 return (error); 2240 } 2241 2242 int 2243 sys_kmq_setattr(struct thread *td, struct kmq_setattr_args *uap) 2244 { 2245 struct mq_attr attr, oattr; 2246 int error; 2247 2248 if (uap->attr != NULL) { 2249 error = copyin(uap->attr, &attr, sizeof(attr)); 2250 if (error != 0) 2251 return (error); 2252 } 2253 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL, 2254 &oattr); 2255 if (error == 0 && uap->oattr != NULL) { 2256 bzero(oattr.__reserved, sizeof(oattr.__reserved)); 2257 error = copyout(&oattr, uap->oattr, sizeof(oattr)); 2258 } 2259 return (error); 2260 } 2261 2262 int 2263 sys_kmq_timedreceive(struct thread *td, struct kmq_timedreceive_args *uap) 2264 { 2265 struct mqueue *mq; 2266 struct file *fp; 2267 struct timespec *abs_timeout, ets; 2268 int error; 2269 int waitok; 2270 2271 AUDIT_ARG_FD(uap->mqd); 2272 error = getmq_read(td, uap->mqd, &fp, NULL, &mq); 2273 if (error) 2274 return (error); 2275 if (uap->abs_timeout != NULL) { 2276 error = copyin(uap->abs_timeout, &ets, sizeof(ets)); 2277 if (error != 0) 2278 return (error); 2279 abs_timeout = &ets; 2280 } else 2281 abs_timeout = NULL; 2282 waitok = !(fp->f_flag & O_NONBLOCK); 2283 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len, 2284 uap->msg_prio, waitok, abs_timeout); 2285 fdrop(fp, td); 2286 return (error); 2287 } 2288 2289 int 2290 sys_kmq_timedsend(struct thread *td, struct kmq_timedsend_args *uap) 2291 { 2292 struct mqueue *mq; 2293 struct file *fp; 2294 struct timespec *abs_timeout, ets; 2295 int error, waitok; 2296 2297 AUDIT_ARG_FD(uap->mqd); 2298 error = getmq_write(td, uap->mqd, &fp, NULL, &mq); 2299 if (error) 2300 return (error); 2301 if (uap->abs_timeout != NULL) { 2302 error = copyin(uap->abs_timeout, &ets, sizeof(ets)); 2303 if (error != 0) 2304 return (error); 2305 abs_timeout = &ets; 2306 } else 2307 abs_timeout = NULL; 2308 waitok = !(fp->f_flag & O_NONBLOCK); 2309 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len, 2310 uap->msg_prio, waitok, abs_timeout); 2311 fdrop(fp, td); 2312 return (error); 2313 } 2314 2315 static int 2316 kern_kmq_notify(struct thread *td, int mqd, struct sigevent *sigev) 2317 { 2318 struct filedesc *fdp; 2319 struct proc *p; 2320 struct mqueue *mq; 2321 struct file *fp, *fp2; 2322 struct mqueue_notifier *nt, *newnt = NULL; 2323 int error; 2324 2325 AUDIT_ARG_FD(mqd); 2326 if (sigev != NULL) { 2327 if (sigev->sigev_notify != SIGEV_SIGNAL && 2328 sigev->sigev_notify != SIGEV_THREAD_ID && 2329 sigev->sigev_notify != SIGEV_NONE) 2330 return (EINVAL); 2331 if ((sigev->sigev_notify == SIGEV_SIGNAL || 2332 sigev->sigev_notify == SIGEV_THREAD_ID) && 2333 !_SIG_VALID(sigev->sigev_signo)) 2334 return (EINVAL); 2335 } 2336 p = td->td_proc; 2337 fdp = td->td_proc->p_fd; 2338 error = getmq(td, mqd, &fp, NULL, &mq); 2339 if (error) 2340 return (error); 2341 again: 2342 FILEDESC_SLOCK(fdp); 2343 fp2 = fget_locked(fdp, mqd); 2344 if (fp2 == NULL) { 2345 FILEDESC_SUNLOCK(fdp); 2346 error = EBADF; 2347 goto out; 2348 } 2349 #ifdef CAPABILITIES 2350 error = cap_check(cap_rights(fdp, mqd), &cap_event_rights); 2351 if (error) { 2352 FILEDESC_SUNLOCK(fdp); 2353 goto out; 2354 } 2355 #endif 2356 if (fp2 != fp) { 2357 FILEDESC_SUNLOCK(fdp); 2358 error = EBADF; 2359 goto out; 2360 } 2361 mtx_lock(&mq->mq_mutex); 2362 FILEDESC_SUNLOCK(fdp); 2363 if (sigev != NULL) { 2364 if (mq->mq_notifier != NULL) { 2365 error = EBUSY; 2366 } else { 2367 PROC_LOCK(p); 2368 nt = notifier_search(p, mqd); 2369 if (nt == NULL) { 2370 if (newnt == NULL) { 2371 PROC_UNLOCK(p); 2372 mtx_unlock(&mq->mq_mutex); 2373 newnt = notifier_alloc(); 2374 goto again; 2375 } 2376 } 2377 2378 if (nt != NULL) { 2379 sigqueue_take(&nt->nt_ksi); 2380 if (newnt != NULL) { 2381 notifier_free(newnt); 2382 newnt = NULL; 2383 } 2384 } else { 2385 nt = newnt; 2386 newnt = NULL; 2387 ksiginfo_init(&nt->nt_ksi); 2388 nt->nt_ksi.ksi_flags |= KSI_INS | KSI_EXT; 2389 nt->nt_ksi.ksi_code = SI_MESGQ; 2390 nt->nt_proc = p; 2391 nt->nt_ksi.ksi_mqd = mqd; 2392 notifier_insert(p, nt); 2393 } 2394 nt->nt_sigev = *sigev; 2395 mq->mq_notifier = nt; 2396 PROC_UNLOCK(p); 2397 /* 2398 * if there is no receivers and message queue 2399 * is not empty, we should send notification 2400 * as soon as possible. 2401 */ 2402 if (mq->mq_receivers == 0 && 2403 !TAILQ_EMPTY(&mq->mq_msgq)) 2404 mqueue_send_notification(mq); 2405 } 2406 } else { 2407 notifier_remove(p, mq, mqd); 2408 } 2409 mtx_unlock(&mq->mq_mutex); 2410 2411 out: 2412 fdrop(fp, td); 2413 if (newnt != NULL) 2414 notifier_free(newnt); 2415 return (error); 2416 } 2417 2418 int 2419 sys_kmq_notify(struct thread *td, struct kmq_notify_args *uap) 2420 { 2421 struct sigevent ev, *evp; 2422 int error; 2423 2424 if (uap->sigev == NULL) { 2425 evp = NULL; 2426 } else { 2427 error = copyin(uap->sigev, &ev, sizeof(ev)); 2428 if (error != 0) 2429 return (error); 2430 evp = &ev; 2431 } 2432 return (kern_kmq_notify(td, uap->mqd, evp)); 2433 } 2434 2435 static void 2436 mqueue_fdclose(struct thread *td, int fd, struct file *fp) 2437 { 2438 struct mqueue *mq; 2439 #ifdef INVARIANTS 2440 struct filedesc *fdp; 2441 2442 fdp = td->td_proc->p_fd; 2443 FILEDESC_LOCK_ASSERT(fdp); 2444 #endif 2445 2446 if (fp->f_ops == &mqueueops) { 2447 mq = FPTOMQ(fp); 2448 mtx_lock(&mq->mq_mutex); 2449 notifier_remove(td->td_proc, mq, fd); 2450 2451 /* have to wakeup thread in same process */ 2452 if (mq->mq_flags & MQ_RSEL) { 2453 mq->mq_flags &= ~MQ_RSEL; 2454 selwakeup(&mq->mq_rsel); 2455 } 2456 if (mq->mq_flags & MQ_WSEL) { 2457 mq->mq_flags &= ~MQ_WSEL; 2458 selwakeup(&mq->mq_wsel); 2459 } 2460 mtx_unlock(&mq->mq_mutex); 2461 } 2462 } 2463 2464 static void 2465 mq_proc_exit(void *arg __unused, struct proc *p) 2466 { 2467 struct filedesc *fdp; 2468 struct file *fp; 2469 struct mqueue *mq; 2470 int i; 2471 2472 fdp = p->p_fd; 2473 FILEDESC_SLOCK(fdp); 2474 for (i = 0; i < fdp->fd_nfiles; ++i) { 2475 fp = fget_locked(fdp, i); 2476 if (fp != NULL && fp->f_ops == &mqueueops) { 2477 mq = FPTOMQ(fp); 2478 mtx_lock(&mq->mq_mutex); 2479 notifier_remove(p, FPTOMQ(fp), i); 2480 mtx_unlock(&mq->mq_mutex); 2481 } 2482 } 2483 FILEDESC_SUNLOCK(fdp); 2484 KASSERT(LIST_EMPTY(&p->p_mqnotifier), ("mq notifiers left")); 2485 } 2486 2487 static int 2488 mqf_poll(struct file *fp, int events, struct ucred *active_cred, 2489 struct thread *td) 2490 { 2491 struct mqueue *mq = FPTOMQ(fp); 2492 int revents = 0; 2493 2494 mtx_lock(&mq->mq_mutex); 2495 if (events & (POLLIN | POLLRDNORM)) { 2496 if (mq->mq_curmsgs) { 2497 revents |= events & (POLLIN | POLLRDNORM); 2498 } else { 2499 mq->mq_flags |= MQ_RSEL; 2500 selrecord(td, &mq->mq_rsel); 2501 } 2502 } 2503 if (events & POLLOUT) { 2504 if (mq->mq_curmsgs < mq->mq_maxmsg) 2505 revents |= POLLOUT; 2506 else { 2507 mq->mq_flags |= MQ_WSEL; 2508 selrecord(td, &mq->mq_wsel); 2509 } 2510 } 2511 mtx_unlock(&mq->mq_mutex); 2512 return (revents); 2513 } 2514 2515 static int 2516 mqf_close(struct file *fp, struct thread *td) 2517 { 2518 struct mqfs_node *pn; 2519 2520 fp->f_ops = &badfileops; 2521 pn = fp->f_data; 2522 fp->f_data = NULL; 2523 sx_xlock(&mqfs_data.mi_lock); 2524 mqnode_release(pn); 2525 sx_xunlock(&mqfs_data.mi_lock); 2526 return (0); 2527 } 2528 2529 static int 2530 mqf_stat(struct file *fp, struct stat *st, struct ucred *active_cred, 2531 struct thread *td) 2532 { 2533 struct mqfs_node *pn = fp->f_data; 2534 2535 bzero(st, sizeof *st); 2536 sx_xlock(&mqfs_data.mi_lock); 2537 st->st_atim = pn->mn_atime; 2538 st->st_mtim = pn->mn_mtime; 2539 st->st_ctim = pn->mn_ctime; 2540 st->st_birthtim = pn->mn_birth; 2541 st->st_uid = pn->mn_uid; 2542 st->st_gid = pn->mn_gid; 2543 st->st_mode = S_IFIFO | pn->mn_mode; 2544 sx_xunlock(&mqfs_data.mi_lock); 2545 return (0); 2546 } 2547 2548 static int 2549 mqf_chmod(struct file *fp, mode_t mode, struct ucred *active_cred, 2550 struct thread *td) 2551 { 2552 struct mqfs_node *pn; 2553 int error; 2554 2555 error = 0; 2556 pn = fp->f_data; 2557 sx_xlock(&mqfs_data.mi_lock); 2558 error = vaccess(VREG, pn->mn_mode, pn->mn_uid, pn->mn_gid, VADMIN, 2559 active_cred, NULL); 2560 if (error != 0) 2561 goto out; 2562 pn->mn_mode = mode & ACCESSPERMS; 2563 out: 2564 sx_xunlock(&mqfs_data.mi_lock); 2565 return (error); 2566 } 2567 2568 static int 2569 mqf_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred, 2570 struct thread *td) 2571 { 2572 struct mqfs_node *pn; 2573 int error; 2574 2575 error = 0; 2576 pn = fp->f_data; 2577 sx_xlock(&mqfs_data.mi_lock); 2578 if (uid == (uid_t)-1) 2579 uid = pn->mn_uid; 2580 if (gid == (gid_t)-1) 2581 gid = pn->mn_gid; 2582 if (((uid != pn->mn_uid && uid != active_cred->cr_uid) || 2583 (gid != pn->mn_gid && !groupmember(gid, active_cred))) && 2584 (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN, 0))) 2585 goto out; 2586 pn->mn_uid = uid; 2587 pn->mn_gid = gid; 2588 out: 2589 sx_xunlock(&mqfs_data.mi_lock); 2590 return (error); 2591 } 2592 2593 static int 2594 mqf_kqfilter(struct file *fp, struct knote *kn) 2595 { 2596 struct mqueue *mq = FPTOMQ(fp); 2597 int error = 0; 2598 2599 if (kn->kn_filter == EVFILT_READ) { 2600 kn->kn_fop = &mq_rfiltops; 2601 knlist_add(&mq->mq_rsel.si_note, kn, 0); 2602 } else if (kn->kn_filter == EVFILT_WRITE) { 2603 kn->kn_fop = &mq_wfiltops; 2604 knlist_add(&mq->mq_wsel.si_note, kn, 0); 2605 } else 2606 error = EINVAL; 2607 return (error); 2608 } 2609 2610 static void 2611 filt_mqdetach(struct knote *kn) 2612 { 2613 struct mqueue *mq = FPTOMQ(kn->kn_fp); 2614 2615 if (kn->kn_filter == EVFILT_READ) 2616 knlist_remove(&mq->mq_rsel.si_note, kn, 0); 2617 else if (kn->kn_filter == EVFILT_WRITE) 2618 knlist_remove(&mq->mq_wsel.si_note, kn, 0); 2619 else 2620 panic("filt_mqdetach"); 2621 } 2622 2623 static int 2624 filt_mqread(struct knote *kn, long hint) 2625 { 2626 struct mqueue *mq = FPTOMQ(kn->kn_fp); 2627 2628 mtx_assert(&mq->mq_mutex, MA_OWNED); 2629 return (mq->mq_curmsgs != 0); 2630 } 2631 2632 static int 2633 filt_mqwrite(struct knote *kn, long hint) 2634 { 2635 struct mqueue *mq = FPTOMQ(kn->kn_fp); 2636 2637 mtx_assert(&mq->mq_mutex, MA_OWNED); 2638 return (mq->mq_curmsgs < mq->mq_maxmsg); 2639 } 2640 2641 static int 2642 mqf_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) 2643 { 2644 2645 kif->kf_type = KF_TYPE_MQUEUE; 2646 return (0); 2647 } 2648 2649 static struct fileops mqueueops = { 2650 .fo_read = invfo_rdwr, 2651 .fo_write = invfo_rdwr, 2652 .fo_truncate = invfo_truncate, 2653 .fo_ioctl = invfo_ioctl, 2654 .fo_poll = mqf_poll, 2655 .fo_kqfilter = mqf_kqfilter, 2656 .fo_stat = mqf_stat, 2657 .fo_close = mqf_close, 2658 .fo_chmod = mqf_chmod, 2659 .fo_chown = mqf_chown, 2660 .fo_sendfile = invfo_sendfile, 2661 .fo_fill_kinfo = mqf_fill_kinfo, 2662 }; 2663 2664 static struct vop_vector mqfs_vnodeops = { 2665 .vop_default = &default_vnodeops, 2666 .vop_access = mqfs_access, 2667 .vop_cachedlookup = mqfs_lookup, 2668 .vop_lookup = vfs_cache_lookup, 2669 .vop_reclaim = mqfs_reclaim, 2670 .vop_create = mqfs_create, 2671 .vop_remove = mqfs_remove, 2672 .vop_inactive = mqfs_inactive, 2673 .vop_open = mqfs_open, 2674 .vop_close = mqfs_close, 2675 .vop_getattr = mqfs_getattr, 2676 .vop_setattr = mqfs_setattr, 2677 .vop_read = mqfs_read, 2678 .vop_write = VOP_EOPNOTSUPP, 2679 .vop_readdir = mqfs_readdir, 2680 .vop_mkdir = VOP_EOPNOTSUPP, 2681 .vop_rmdir = VOP_EOPNOTSUPP 2682 }; 2683 2684 static struct vfsops mqfs_vfsops = { 2685 .vfs_init = mqfs_init, 2686 .vfs_uninit = mqfs_uninit, 2687 .vfs_mount = mqfs_mount, 2688 .vfs_unmount = mqfs_unmount, 2689 .vfs_root = mqfs_root, 2690 .vfs_statfs = mqfs_statfs, 2691 }; 2692 2693 static struct vfsconf mqueuefs_vfsconf = { 2694 .vfc_version = VFS_VERSION, 2695 .vfc_name = "mqueuefs", 2696 .vfc_vfsops = &mqfs_vfsops, 2697 .vfc_typenum = -1, 2698 .vfc_flags = VFCF_SYNTHETIC 2699 }; 2700 2701 static struct syscall_helper_data mq_syscalls[] = { 2702 SYSCALL_INIT_HELPER(kmq_open), 2703 SYSCALL_INIT_HELPER_F(kmq_setattr, SYF_CAPENABLED), 2704 SYSCALL_INIT_HELPER_F(kmq_timedsend, SYF_CAPENABLED), 2705 SYSCALL_INIT_HELPER_F(kmq_timedreceive, SYF_CAPENABLED), 2706 SYSCALL_INIT_HELPER_F(kmq_notify, SYF_CAPENABLED), 2707 SYSCALL_INIT_HELPER(kmq_unlink), 2708 SYSCALL_INIT_LAST 2709 }; 2710 2711 #ifdef COMPAT_FREEBSD32 2712 #include <compat/freebsd32/freebsd32.h> 2713 #include <compat/freebsd32/freebsd32_proto.h> 2714 #include <compat/freebsd32/freebsd32_signal.h> 2715 #include <compat/freebsd32/freebsd32_syscall.h> 2716 #include <compat/freebsd32/freebsd32_util.h> 2717 2718 static void 2719 mq_attr_from32(const struct mq_attr32 *from, struct mq_attr *to) 2720 { 2721 2722 to->mq_flags = from->mq_flags; 2723 to->mq_maxmsg = from->mq_maxmsg; 2724 to->mq_msgsize = from->mq_msgsize; 2725 to->mq_curmsgs = from->mq_curmsgs; 2726 } 2727 2728 static void 2729 mq_attr_to32(const struct mq_attr *from, struct mq_attr32 *to) 2730 { 2731 2732 to->mq_flags = from->mq_flags; 2733 to->mq_maxmsg = from->mq_maxmsg; 2734 to->mq_msgsize = from->mq_msgsize; 2735 to->mq_curmsgs = from->mq_curmsgs; 2736 } 2737 2738 int 2739 freebsd32_kmq_open(struct thread *td, struct freebsd32_kmq_open_args *uap) 2740 { 2741 struct mq_attr attr; 2742 struct mq_attr32 attr32; 2743 int flags, error; 2744 2745 if ((uap->flags & O_ACCMODE) == O_ACCMODE || uap->flags & O_EXEC) 2746 return (EINVAL); 2747 flags = FFLAGS(uap->flags); 2748 if ((flags & O_CREAT) != 0 && uap->attr != NULL) { 2749 error = copyin(uap->attr, &attr32, sizeof(attr32)); 2750 if (error) 2751 return (error); 2752 mq_attr_from32(&attr32, &attr); 2753 } 2754 return (kern_kmq_open(td, uap->path, flags, uap->mode, 2755 uap->attr != NULL ? &attr : NULL)); 2756 } 2757 2758 int 2759 freebsd32_kmq_setattr(struct thread *td, struct freebsd32_kmq_setattr_args *uap) 2760 { 2761 struct mq_attr attr, oattr; 2762 struct mq_attr32 attr32, oattr32; 2763 int error; 2764 2765 if (uap->attr != NULL) { 2766 error = copyin(uap->attr, &attr32, sizeof(attr32)); 2767 if (error != 0) 2768 return (error); 2769 mq_attr_from32(&attr32, &attr); 2770 } 2771 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL, 2772 &oattr); 2773 if (error == 0 && uap->oattr != NULL) { 2774 mq_attr_to32(&oattr, &oattr32); 2775 bzero(oattr32.__reserved, sizeof(oattr32.__reserved)); 2776 error = copyout(&oattr32, uap->oattr, sizeof(oattr32)); 2777 } 2778 return (error); 2779 } 2780 2781 int 2782 freebsd32_kmq_timedsend(struct thread *td, 2783 struct freebsd32_kmq_timedsend_args *uap) 2784 { 2785 struct mqueue *mq; 2786 struct file *fp; 2787 struct timespec32 ets32; 2788 struct timespec *abs_timeout, ets; 2789 int error; 2790 int waitok; 2791 2792 AUDIT_ARG_FD(uap->mqd); 2793 error = getmq_write(td, uap->mqd, &fp, NULL, &mq); 2794 if (error) 2795 return (error); 2796 if (uap->abs_timeout != NULL) { 2797 error = copyin(uap->abs_timeout, &ets32, sizeof(ets32)); 2798 if (error != 0) 2799 return (error); 2800 CP(ets32, ets, tv_sec); 2801 CP(ets32, ets, tv_nsec); 2802 abs_timeout = &ets; 2803 } else 2804 abs_timeout = NULL; 2805 waitok = !(fp->f_flag & O_NONBLOCK); 2806 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len, 2807 uap->msg_prio, waitok, abs_timeout); 2808 fdrop(fp, td); 2809 return (error); 2810 } 2811 2812 int 2813 freebsd32_kmq_timedreceive(struct thread *td, 2814 struct freebsd32_kmq_timedreceive_args *uap) 2815 { 2816 struct mqueue *mq; 2817 struct file *fp; 2818 struct timespec32 ets32; 2819 struct timespec *abs_timeout, ets; 2820 int error, waitok; 2821 2822 AUDIT_ARG_FD(uap->mqd); 2823 error = getmq_read(td, uap->mqd, &fp, NULL, &mq); 2824 if (error) 2825 return (error); 2826 if (uap->abs_timeout != NULL) { 2827 error = copyin(uap->abs_timeout, &ets32, sizeof(ets32)); 2828 if (error != 0) 2829 return (error); 2830 CP(ets32, ets, tv_sec); 2831 CP(ets32, ets, tv_nsec); 2832 abs_timeout = &ets; 2833 } else 2834 abs_timeout = NULL; 2835 waitok = !(fp->f_flag & O_NONBLOCK); 2836 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len, 2837 uap->msg_prio, waitok, abs_timeout); 2838 fdrop(fp, td); 2839 return (error); 2840 } 2841 2842 int 2843 freebsd32_kmq_notify(struct thread *td, struct freebsd32_kmq_notify_args *uap) 2844 { 2845 struct sigevent ev, *evp; 2846 struct sigevent32 ev32; 2847 int error; 2848 2849 if (uap->sigev == NULL) { 2850 evp = NULL; 2851 } else { 2852 error = copyin(uap->sigev, &ev32, sizeof(ev32)); 2853 if (error != 0) 2854 return (error); 2855 error = convert_sigevent32(&ev32, &ev); 2856 if (error != 0) 2857 return (error); 2858 evp = &ev; 2859 } 2860 return (kern_kmq_notify(td, uap->mqd, evp)); 2861 } 2862 2863 static struct syscall_helper_data mq32_syscalls[] = { 2864 SYSCALL32_INIT_HELPER(freebsd32_kmq_open), 2865 SYSCALL32_INIT_HELPER_F(freebsd32_kmq_setattr, SYF_CAPENABLED), 2866 SYSCALL32_INIT_HELPER_F(freebsd32_kmq_timedsend, SYF_CAPENABLED), 2867 SYSCALL32_INIT_HELPER_F(freebsd32_kmq_timedreceive, SYF_CAPENABLED), 2868 SYSCALL32_INIT_HELPER_F(freebsd32_kmq_notify, SYF_CAPENABLED), 2869 SYSCALL32_INIT_HELPER_COMPAT(kmq_unlink), 2870 SYSCALL_INIT_LAST 2871 }; 2872 #endif 2873 2874 static int 2875 mqinit(void) 2876 { 2877 int error; 2878 2879 error = syscall_helper_register(mq_syscalls, SY_THR_STATIC_KLD); 2880 if (error != 0) 2881 return (error); 2882 #ifdef COMPAT_FREEBSD32 2883 error = syscall32_helper_register(mq32_syscalls, SY_THR_STATIC_KLD); 2884 if (error != 0) 2885 return (error); 2886 #endif 2887 return (0); 2888 } 2889 2890 static int 2891 mqunload(void) 2892 { 2893 2894 #ifdef COMPAT_FREEBSD32 2895 syscall32_helper_unregister(mq32_syscalls); 2896 #endif 2897 syscall_helper_unregister(mq_syscalls); 2898 return (0); 2899 } 2900 2901 static int 2902 mq_modload(struct module *module, int cmd, void *arg) 2903 { 2904 int error = 0; 2905 2906 error = vfs_modevent(module, cmd, arg); 2907 if (error != 0) 2908 return (error); 2909 2910 switch (cmd) { 2911 case MOD_LOAD: 2912 error = mqinit(); 2913 if (error != 0) 2914 mqunload(); 2915 break; 2916 case MOD_UNLOAD: 2917 error = mqunload(); 2918 break; 2919 default: 2920 break; 2921 } 2922 return (error); 2923 } 2924 2925 static moduledata_t mqueuefs_mod = { 2926 "mqueuefs", 2927 mq_modload, 2928 &mqueuefs_vfsconf 2929 }; 2930 DECLARE_MODULE(mqueuefs, mqueuefs_mod, SI_SUB_VFS, SI_ORDER_MIDDLE); 2931 MODULE_VERSION(mqueuefs, 1); 2932