1 /* $FreeBSD$ */ 2 /*- 3 * Copyright (c) 2010-2022 Hans Petter Selasky. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/stdint.h> 28 #include <sys/stddef.h> 29 #include <sys/param.h> 30 #include <sys/types.h> 31 #include <sys/systm.h> 32 #include <sys/conf.h> 33 #include <sys/kernel.h> 34 #include <sys/bus.h> 35 #include <sys/linker_set.h> 36 #include <sys/module.h> 37 #include <sys/lock.h> 38 #include <sys/mutex.h> 39 #include <sys/condvar.h> 40 #include <sys/sysctl.h> 41 #include <sys/unistd.h> 42 #include <sys/malloc.h> 43 #include <sys/priv.h> 44 #include <sys/uio.h> 45 #include <sys/poll.h> 46 #include <sys/sx.h> 47 #include <sys/rwlock.h> 48 #include <sys/queue.h> 49 #include <sys/fcntl.h> 50 #include <sys/proc.h> 51 #include <sys/vnode.h> 52 #include <sys/selinfo.h> 53 #include <sys/ptrace.h> 54 #include <sys/sysent.h> 55 56 #include <machine/bus.h> 57 58 #include <vm/vm.h> 59 #include <vm/pmap.h> 60 #include <vm/vm_object.h> 61 #include <vm/vm_page.h> 62 #include <vm/vm_pager.h> 63 64 #include <fs/cuse/cuse_defs.h> 65 #include <fs/cuse/cuse_ioctl.h> 66 67 #define CUSE_ALLOC_PAGES_MAX \ 68 (CUSE_ALLOC_BYTES_MAX / PAGE_SIZE) 69 70 #if (CUSE_ALLOC_PAGES_MAX == 0) 71 #error "PAGE_SIZE is too big!" 72 #endif 73 74 static int 75 cuse_modevent(module_t mod, int type, void *data) 76 { 77 switch (type) { 78 case MOD_LOAD: 79 case MOD_UNLOAD: 80 return (0); 81 default: 82 return (EOPNOTSUPP); 83 } 84 } 85 86 static moduledata_t cuse_mod = { 87 .name = "cuse", 88 .evhand = &cuse_modevent, 89 }; 90 91 DECLARE_MODULE(cuse, cuse_mod, SI_SUB_DEVFS, SI_ORDER_FIRST); 92 MODULE_VERSION(cuse, 1); 93 94 /* 95 * Prevent cuse4bsd.ko and cuse.ko from loading at the same time by 96 * declaring support for the cuse4bsd interface in cuse.ko: 97 */ 98 MODULE_VERSION(cuse4bsd, 1); 99 100 #ifdef FEATURE 101 FEATURE(cuse, "Userspace character devices"); 102 #endif 103 104 struct cuse_command; 105 struct cuse_server; 106 struct cuse_client; 107 108 struct cuse_client_command { 109 TAILQ_ENTRY(cuse_client_command) entry; 110 struct cuse_command sub; 111 struct sx sx; 112 struct cv cv; 113 struct thread *entered; 114 struct cuse_client *client; 115 struct proc *proc_curr; 116 int proc_refs; 117 int got_signal; 118 int error; 119 int command; 120 }; 121 122 struct cuse_memory { 123 TAILQ_ENTRY(cuse_memory) entry; 124 vm_object_t object; 125 uint32_t page_count; 126 uint32_t alloc_nr; 127 }; 128 129 struct cuse_server_dev { 130 TAILQ_ENTRY(cuse_server_dev) entry; 131 struct cuse_server *server; 132 struct cdev *kern_dev; 133 struct cuse_dev *user_dev; 134 }; 135 136 struct cuse_server { 137 TAILQ_ENTRY(cuse_server) entry; 138 TAILQ_HEAD(, cuse_client_command) head; 139 TAILQ_HEAD(, cuse_server_dev) hdev; 140 TAILQ_HEAD(, cuse_client) hcli; 141 TAILQ_HEAD(, cuse_memory) hmem; 142 struct mtx mtx; 143 struct cv cv; 144 struct selinfo selinfo; 145 pid_t pid; 146 int is_closing; 147 int refs; 148 }; 149 150 struct cuse_client { 151 TAILQ_ENTRY(cuse_client) entry; 152 TAILQ_ENTRY(cuse_client) entry_ref; 153 struct cuse_client_command cmds[CUSE_CMD_MAX]; 154 struct cuse_server *server; 155 struct cuse_server_dev *server_dev; 156 157 uint8_t ioctl_buffer[CUSE_BUFFER_MAX] __aligned(4); 158 159 int fflags; /* file flags */ 160 int cflags; /* client flags */ 161 #define CUSE_CLI_IS_CLOSING 0x01 162 #define CUSE_CLI_KNOTE_NEED_READ 0x02 163 #define CUSE_CLI_KNOTE_NEED_WRITE 0x04 164 #define CUSE_CLI_KNOTE_HAS_READ 0x08 165 #define CUSE_CLI_KNOTE_HAS_WRITE 0x10 166 }; 167 168 #define CUSE_CLIENT_CLOSING(pcc) \ 169 ((pcc)->cflags & CUSE_CLI_IS_CLOSING) 170 171 static MALLOC_DEFINE(M_CUSE, "cuse", "CUSE memory"); 172 173 static TAILQ_HEAD(, cuse_server) cuse_server_head; 174 static struct mtx cuse_global_mtx; 175 static struct cdev *cuse_dev; 176 static struct cuse_server *cuse_alloc_unit[CUSE_DEVICES_MAX]; 177 static int cuse_alloc_unit_id[CUSE_DEVICES_MAX]; 178 179 static void cuse_server_wakeup_all_client_locked(struct cuse_server *pcs); 180 static void cuse_client_kqfilter_read_detach(struct knote *kn); 181 static void cuse_client_kqfilter_write_detach(struct knote *kn); 182 static int cuse_client_kqfilter_read_event(struct knote *kn, long hint); 183 static int cuse_client_kqfilter_write_event(struct knote *kn, long hint); 184 185 static struct filterops cuse_client_kqfilter_read_ops = { 186 .f_isfd = 1, 187 .f_detach = cuse_client_kqfilter_read_detach, 188 .f_event = cuse_client_kqfilter_read_event, 189 }; 190 191 static struct filterops cuse_client_kqfilter_write_ops = { 192 .f_isfd = 1, 193 .f_detach = cuse_client_kqfilter_write_detach, 194 .f_event = cuse_client_kqfilter_write_event, 195 }; 196 197 static d_open_t cuse_client_open; 198 static d_close_t cuse_client_close; 199 static d_ioctl_t cuse_client_ioctl; 200 static d_read_t cuse_client_read; 201 static d_write_t cuse_client_write; 202 static d_poll_t cuse_client_poll; 203 static d_mmap_single_t cuse_client_mmap_single; 204 static d_kqfilter_t cuse_client_kqfilter; 205 206 static struct cdevsw cuse_client_devsw = { 207 .d_version = D_VERSION, 208 .d_open = cuse_client_open, 209 .d_close = cuse_client_close, 210 .d_ioctl = cuse_client_ioctl, 211 .d_name = "cuse_client", 212 .d_flags = D_TRACKCLOSE, 213 .d_read = cuse_client_read, 214 .d_write = cuse_client_write, 215 .d_poll = cuse_client_poll, 216 .d_mmap_single = cuse_client_mmap_single, 217 .d_kqfilter = cuse_client_kqfilter, 218 }; 219 220 static d_open_t cuse_server_open; 221 static d_close_t cuse_server_close; 222 static d_ioctl_t cuse_server_ioctl; 223 static d_read_t cuse_server_read; 224 static d_write_t cuse_server_write; 225 static d_poll_t cuse_server_poll; 226 static d_mmap_single_t cuse_server_mmap_single; 227 228 static struct cdevsw cuse_server_devsw = { 229 .d_version = D_VERSION, 230 .d_open = cuse_server_open, 231 .d_close = cuse_server_close, 232 .d_ioctl = cuse_server_ioctl, 233 .d_name = "cuse_server", 234 .d_flags = D_TRACKCLOSE, 235 .d_read = cuse_server_read, 236 .d_write = cuse_server_write, 237 .d_poll = cuse_server_poll, 238 .d_mmap_single = cuse_server_mmap_single, 239 }; 240 241 static void cuse_client_is_closing(struct cuse_client *); 242 static int cuse_free_unit_by_id_locked(struct cuse_server *, int); 243 244 static void 245 cuse_global_lock(void) 246 { 247 mtx_lock(&cuse_global_mtx); 248 } 249 250 static void 251 cuse_global_unlock(void) 252 { 253 mtx_unlock(&cuse_global_mtx); 254 } 255 256 static void 257 cuse_server_lock(struct cuse_server *pcs) 258 { 259 mtx_lock(&pcs->mtx); 260 } 261 262 static void 263 cuse_server_unlock(struct cuse_server *pcs) 264 { 265 mtx_unlock(&pcs->mtx); 266 } 267 268 static void 269 cuse_cmd_lock(struct cuse_client_command *pccmd) 270 { 271 sx_xlock(&pccmd->sx); 272 } 273 274 static void 275 cuse_cmd_unlock(struct cuse_client_command *pccmd) 276 { 277 sx_xunlock(&pccmd->sx); 278 } 279 280 static void 281 cuse_kern_init(void *arg) 282 { 283 TAILQ_INIT(&cuse_server_head); 284 285 mtx_init(&cuse_global_mtx, "cuse-global-mtx", NULL, MTX_DEF); 286 287 cuse_dev = make_dev(&cuse_server_devsw, 0, 288 UID_ROOT, GID_OPERATOR, 0600, "cuse"); 289 290 printf("Cuse v%d.%d.%d @ /dev/cuse\n", 291 (CUSE_VERSION >> 16) & 0xFF, (CUSE_VERSION >> 8) & 0xFF, 292 (CUSE_VERSION >> 0) & 0xFF); 293 } 294 SYSINIT(cuse_kern_init, SI_SUB_DEVFS, SI_ORDER_ANY, cuse_kern_init, NULL); 295 296 static void 297 cuse_kern_uninit(void *arg) 298 { 299 void *ptr; 300 301 while (1) { 302 printf("Cuse: Please exit all /dev/cuse instances " 303 "and processes which have used this device.\n"); 304 305 pause("DRAIN", 2 * hz); 306 307 cuse_global_lock(); 308 ptr = TAILQ_FIRST(&cuse_server_head); 309 cuse_global_unlock(); 310 311 if (ptr == NULL) 312 break; 313 } 314 315 if (cuse_dev != NULL) 316 destroy_dev(cuse_dev); 317 318 mtx_destroy(&cuse_global_mtx); 319 } 320 SYSUNINIT(cuse_kern_uninit, SI_SUB_DEVFS, SI_ORDER_ANY, cuse_kern_uninit, 0); 321 322 static int 323 cuse_server_get(struct cuse_server **ppcs) 324 { 325 struct cuse_server *pcs; 326 int error; 327 328 error = devfs_get_cdevpriv((void **)&pcs); 329 if (error != 0) { 330 *ppcs = NULL; 331 return (error); 332 } 333 if (pcs->is_closing) { 334 *ppcs = NULL; 335 return (EINVAL); 336 } 337 *ppcs = pcs; 338 return (0); 339 } 340 341 static void 342 cuse_server_is_closing(struct cuse_server *pcs) 343 { 344 struct cuse_client *pcc; 345 346 if (pcs->is_closing) 347 return; 348 349 pcs->is_closing = 1; 350 351 TAILQ_FOREACH(pcc, &pcs->hcli, entry) { 352 cuse_client_is_closing(pcc); 353 } 354 } 355 356 static struct cuse_client_command * 357 cuse_server_find_command(struct cuse_server *pcs, struct thread *td) 358 { 359 struct cuse_client *pcc; 360 int n; 361 362 if (pcs->is_closing) 363 goto done; 364 365 TAILQ_FOREACH(pcc, &pcs->hcli, entry) { 366 if (CUSE_CLIENT_CLOSING(pcc)) 367 continue; 368 for (n = 0; n != CUSE_CMD_MAX; n++) { 369 if (pcc->cmds[n].entered == td) 370 return (&pcc->cmds[n]); 371 } 372 } 373 done: 374 return (NULL); 375 } 376 377 static void 378 cuse_str_filter(char *ptr) 379 { 380 int c; 381 382 while (((c = *ptr) != 0)) { 383 if ((c >= 'a') && (c <= 'z')) { 384 ptr++; 385 continue; 386 } 387 if ((c >= 'A') && (c <= 'Z')) { 388 ptr++; 389 continue; 390 } 391 if ((c >= '0') && (c <= '9')) { 392 ptr++; 393 continue; 394 } 395 if ((c == '.') || (c == '_') || (c == '/')) { 396 ptr++; 397 continue; 398 } 399 *ptr = '_'; 400 401 ptr++; 402 } 403 } 404 405 static int 406 cuse_convert_error(int error) 407 { 408 ; /* indent fix */ 409 switch (error) { 410 case CUSE_ERR_NONE: 411 return (0); 412 case CUSE_ERR_BUSY: 413 return (EBUSY); 414 case CUSE_ERR_WOULDBLOCK: 415 return (EWOULDBLOCK); 416 case CUSE_ERR_INVALID: 417 return (EINVAL); 418 case CUSE_ERR_NO_MEMORY: 419 return (ENOMEM); 420 case CUSE_ERR_FAULT: 421 return (EFAULT); 422 case CUSE_ERR_SIGNAL: 423 return (EINTR); 424 case CUSE_ERR_NO_DEVICE: 425 return (ENODEV); 426 default: 427 return (ENXIO); 428 } 429 } 430 431 static void 432 cuse_vm_memory_free(struct cuse_memory *mem) 433 { 434 /* last user is gone - free */ 435 vm_object_deallocate(mem->object); 436 437 /* free CUSE memory */ 438 free(mem, M_CUSE); 439 } 440 441 static int 442 cuse_server_alloc_memory(struct cuse_server *pcs, uint32_t alloc_nr, 443 uint32_t page_count) 444 { 445 struct cuse_memory *temp; 446 struct cuse_memory *mem; 447 vm_object_t object; 448 int error; 449 450 mem = malloc(sizeof(*mem), M_CUSE, M_WAITOK | M_ZERO); 451 452 object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * page_count, 453 VM_PROT_DEFAULT, 0, curthread->td_ucred); 454 if (object == NULL) { 455 error = ENOMEM; 456 goto error_0; 457 } 458 459 cuse_server_lock(pcs); 460 /* check if allocation number already exists */ 461 TAILQ_FOREACH(temp, &pcs->hmem, entry) { 462 if (temp->alloc_nr == alloc_nr) 463 break; 464 } 465 if (temp != NULL) { 466 cuse_server_unlock(pcs); 467 error = EBUSY; 468 goto error_1; 469 } 470 mem->object = object; 471 mem->page_count = page_count; 472 mem->alloc_nr = alloc_nr; 473 TAILQ_INSERT_TAIL(&pcs->hmem, mem, entry); 474 cuse_server_unlock(pcs); 475 476 return (0); 477 478 error_1: 479 vm_object_deallocate(object); 480 error_0: 481 free(mem, M_CUSE); 482 return (error); 483 } 484 485 static int 486 cuse_server_free_memory(struct cuse_server *pcs, uint32_t alloc_nr) 487 { 488 struct cuse_memory *mem; 489 490 cuse_server_lock(pcs); 491 TAILQ_FOREACH(mem, &pcs->hmem, entry) { 492 if (mem->alloc_nr == alloc_nr) 493 break; 494 } 495 if (mem == NULL) { 496 cuse_server_unlock(pcs); 497 return (EINVAL); 498 } 499 TAILQ_REMOVE(&pcs->hmem, mem, entry); 500 cuse_server_unlock(pcs); 501 502 cuse_vm_memory_free(mem); 503 504 return (0); 505 } 506 507 static int 508 cuse_client_get(struct cuse_client **ppcc) 509 { 510 struct cuse_client *pcc; 511 int error; 512 513 /* try to get private data */ 514 error = devfs_get_cdevpriv((void **)&pcc); 515 if (error != 0) { 516 *ppcc = NULL; 517 return (error); 518 } 519 if (CUSE_CLIENT_CLOSING(pcc) || pcc->server->is_closing) { 520 *ppcc = NULL; 521 return (EINVAL); 522 } 523 *ppcc = pcc; 524 return (0); 525 } 526 527 static void 528 cuse_client_is_closing(struct cuse_client *pcc) 529 { 530 struct cuse_client_command *pccmd; 531 uint32_t n; 532 533 if (CUSE_CLIENT_CLOSING(pcc)) 534 return; 535 536 pcc->cflags |= CUSE_CLI_IS_CLOSING; 537 pcc->server_dev = NULL; 538 539 for (n = 0; n != CUSE_CMD_MAX; n++) { 540 pccmd = &pcc->cmds[n]; 541 542 if (pccmd->entry.tqe_prev != NULL) { 543 TAILQ_REMOVE(&pcc->server->head, pccmd, entry); 544 pccmd->entry.tqe_prev = NULL; 545 } 546 cv_broadcast(&pccmd->cv); 547 } 548 } 549 550 static void 551 cuse_client_send_command_locked(struct cuse_client_command *pccmd, 552 uintptr_t data_ptr, unsigned long arg, int fflags, int ioflag) 553 { 554 unsigned long cuse_fflags = 0; 555 struct cuse_server *pcs; 556 557 if (fflags & FREAD) 558 cuse_fflags |= CUSE_FFLAG_READ; 559 560 if (fflags & FWRITE) 561 cuse_fflags |= CUSE_FFLAG_WRITE; 562 563 if (ioflag & IO_NDELAY) 564 cuse_fflags |= CUSE_FFLAG_NONBLOCK; 565 #if defined(__LP64__) 566 if (SV_CURPROC_FLAG(SV_ILP32)) 567 cuse_fflags |= CUSE_FFLAG_COMPAT32; 568 #endif 569 pccmd->sub.fflags = cuse_fflags; 570 pccmd->sub.data_pointer = data_ptr; 571 pccmd->sub.argument = arg; 572 573 pcs = pccmd->client->server; 574 575 if ((pccmd->entry.tqe_prev == NULL) && 576 (CUSE_CLIENT_CLOSING(pccmd->client) == 0) && 577 (pcs->is_closing == 0)) { 578 TAILQ_INSERT_TAIL(&pcs->head, pccmd, entry); 579 cv_signal(&pcs->cv); 580 } 581 } 582 583 static void 584 cuse_client_got_signal(struct cuse_client_command *pccmd) 585 { 586 struct cuse_server *pcs; 587 588 pccmd->got_signal = 1; 589 590 pccmd = &pccmd->client->cmds[CUSE_CMD_SIGNAL]; 591 592 pcs = pccmd->client->server; 593 594 if ((pccmd->entry.tqe_prev == NULL) && 595 (CUSE_CLIENT_CLOSING(pccmd->client) == 0) && 596 (pcs->is_closing == 0)) { 597 TAILQ_INSERT_TAIL(&pcs->head, pccmd, entry); 598 cv_signal(&pcs->cv); 599 } 600 } 601 602 static int 603 cuse_client_receive_command_locked(struct cuse_client_command *pccmd, 604 uint8_t *arg_ptr, uint32_t arg_len) 605 { 606 struct cuse_server *pcs; 607 int error; 608 609 pcs = pccmd->client->server; 610 error = 0; 611 612 pccmd->proc_curr = curthread->td_proc; 613 614 if (CUSE_CLIENT_CLOSING(pccmd->client) || pcs->is_closing) { 615 error = CUSE_ERR_OTHER; 616 goto done; 617 } 618 while (pccmd->command == CUSE_CMD_NONE) { 619 if (error != 0) { 620 cv_wait(&pccmd->cv, &pcs->mtx); 621 } else { 622 error = cv_wait_sig(&pccmd->cv, &pcs->mtx); 623 624 if (error != 0) 625 cuse_client_got_signal(pccmd); 626 } 627 if (CUSE_CLIENT_CLOSING(pccmd->client) || pcs->is_closing) { 628 error = CUSE_ERR_OTHER; 629 goto done; 630 } 631 } 632 633 error = pccmd->error; 634 pccmd->command = CUSE_CMD_NONE; 635 cv_signal(&pccmd->cv); 636 637 done: 638 639 /* wait until all process references are gone */ 640 641 pccmd->proc_curr = NULL; 642 643 while (pccmd->proc_refs != 0) 644 cv_wait(&pccmd->cv, &pcs->mtx); 645 646 return (error); 647 } 648 649 /*------------------------------------------------------------------------* 650 * CUSE SERVER PART 651 *------------------------------------------------------------------------*/ 652 653 static void 654 cuse_server_free_dev(struct cuse_server_dev *pcsd) 655 { 656 struct cuse_server *pcs; 657 struct cuse_client *pcc; 658 659 /* get server pointer */ 660 pcs = pcsd->server; 661 662 /* prevent creation of more devices */ 663 cuse_server_lock(pcs); 664 if (pcsd->kern_dev != NULL) 665 pcsd->kern_dev->si_drv1 = NULL; 666 667 TAILQ_FOREACH(pcc, &pcs->hcli, entry) { 668 if (pcc->server_dev == pcsd) 669 cuse_client_is_closing(pcc); 670 } 671 cuse_server_unlock(pcs); 672 673 /* destroy device, if any */ 674 if (pcsd->kern_dev != NULL) { 675 /* destroy device synchronously */ 676 destroy_dev(pcsd->kern_dev); 677 } 678 free(pcsd, M_CUSE); 679 } 680 681 static void 682 cuse_server_unref(struct cuse_server *pcs) 683 { 684 struct cuse_server_dev *pcsd; 685 struct cuse_memory *mem; 686 687 cuse_server_lock(pcs); 688 if (--(pcs->refs) != 0) { 689 cuse_server_unlock(pcs); 690 return; 691 } 692 cuse_server_is_closing(pcs); 693 /* final client wakeup, if any */ 694 cuse_server_wakeup_all_client_locked(pcs); 695 696 cuse_global_lock(); 697 TAILQ_REMOVE(&cuse_server_head, pcs, entry); 698 cuse_global_unlock(); 699 700 while ((pcsd = TAILQ_FIRST(&pcs->hdev)) != NULL) { 701 TAILQ_REMOVE(&pcs->hdev, pcsd, entry); 702 cuse_server_unlock(pcs); 703 cuse_server_free_dev(pcsd); 704 cuse_server_lock(pcs); 705 } 706 707 cuse_free_unit_by_id_locked(pcs, -1); 708 709 while ((mem = TAILQ_FIRST(&pcs->hmem)) != NULL) { 710 TAILQ_REMOVE(&pcs->hmem, mem, entry); 711 cuse_server_unlock(pcs); 712 cuse_vm_memory_free(mem); 713 cuse_server_lock(pcs); 714 } 715 716 knlist_clear(&pcs->selinfo.si_note, 1); 717 knlist_destroy(&pcs->selinfo.si_note); 718 719 cuse_server_unlock(pcs); 720 721 seldrain(&pcs->selinfo); 722 723 cv_destroy(&pcs->cv); 724 725 mtx_destroy(&pcs->mtx); 726 727 free(pcs, M_CUSE); 728 } 729 730 static int 731 cuse_server_do_close(struct cuse_server *pcs) 732 { 733 int retval; 734 735 cuse_server_lock(pcs); 736 cuse_server_is_closing(pcs); 737 /* final client wakeup, if any */ 738 cuse_server_wakeup_all_client_locked(pcs); 739 740 knlist_clear(&pcs->selinfo.si_note, 1); 741 742 retval = pcs->refs; 743 cuse_server_unlock(pcs); 744 745 return (retval); 746 } 747 748 static void 749 cuse_server_free(void *arg) 750 { 751 struct cuse_server *pcs = arg; 752 753 /* 754 * The final server unref should be done by the server thread 755 * to prevent deadlock in the client cdevpriv destructor, 756 * which cannot destroy itself. 757 */ 758 while (cuse_server_do_close(pcs) != 1) 759 pause("W", hz); 760 761 /* drop final refcount */ 762 cuse_server_unref(pcs); 763 } 764 765 static int 766 cuse_server_open(struct cdev *dev, int fflags, int devtype, struct thread *td) 767 { 768 struct cuse_server *pcs; 769 770 pcs = malloc(sizeof(*pcs), M_CUSE, M_WAITOK | M_ZERO); 771 772 if (devfs_set_cdevpriv(pcs, &cuse_server_free)) { 773 printf("Cuse: Cannot set cdevpriv.\n"); 774 free(pcs, M_CUSE); 775 return (ENOMEM); 776 } 777 /* store current process ID */ 778 pcs->pid = curproc->p_pid; 779 780 TAILQ_INIT(&pcs->head); 781 TAILQ_INIT(&pcs->hdev); 782 TAILQ_INIT(&pcs->hcli); 783 TAILQ_INIT(&pcs->hmem); 784 785 cv_init(&pcs->cv, "cuse-server-cv"); 786 787 mtx_init(&pcs->mtx, "cuse-server-mtx", NULL, MTX_DEF); 788 789 knlist_init_mtx(&pcs->selinfo.si_note, &pcs->mtx); 790 791 cuse_global_lock(); 792 pcs->refs++; 793 TAILQ_INSERT_TAIL(&cuse_server_head, pcs, entry); 794 cuse_global_unlock(); 795 796 return (0); 797 } 798 799 static int 800 cuse_server_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 801 { 802 struct cuse_server *pcs; 803 804 if (cuse_server_get(&pcs) == 0) 805 cuse_server_do_close(pcs); 806 807 return (0); 808 } 809 810 static int 811 cuse_server_read(struct cdev *dev, struct uio *uio, int ioflag) 812 { 813 return (ENXIO); 814 } 815 816 static int 817 cuse_server_write(struct cdev *dev, struct uio *uio, int ioflag) 818 { 819 return (ENXIO); 820 } 821 822 static int 823 cuse_server_ioctl_copy_locked(struct cuse_server *pcs, 824 struct cuse_client_command *pccmd, 825 struct cuse_data_chunk *pchk, int isread) 826 { 827 struct proc *p_proc; 828 uint32_t offset; 829 int error; 830 831 offset = pchk->peer_ptr - CUSE_BUF_MIN_PTR; 832 833 if (pchk->length > CUSE_BUFFER_MAX) 834 return (EFAULT); 835 836 if (offset >= CUSE_BUFFER_MAX) 837 return (EFAULT); 838 839 if ((offset + pchk->length) > CUSE_BUFFER_MAX) 840 return (EFAULT); 841 842 p_proc = pccmd->proc_curr; 843 if (p_proc == NULL) 844 return (ENXIO); 845 846 if (pccmd->proc_refs < 0) 847 return (ENOMEM); 848 849 pccmd->proc_refs++; 850 851 cuse_server_unlock(pcs); 852 853 if (isread == 0) { 854 error = copyin( 855 (void *)pchk->local_ptr, 856 pccmd->client->ioctl_buffer + offset, 857 pchk->length); 858 } else { 859 error = copyout( 860 pccmd->client->ioctl_buffer + offset, 861 (void *)pchk->local_ptr, 862 pchk->length); 863 } 864 865 cuse_server_lock(pcs); 866 867 pccmd->proc_refs--; 868 869 if (pccmd->proc_curr == NULL) 870 cv_signal(&pccmd->cv); 871 872 return (error); 873 } 874 875 static int 876 cuse_proc2proc_copy(struct proc *proc_s, vm_offset_t data_s, 877 struct proc *proc_d, vm_offset_t data_d, size_t len) 878 { 879 struct thread *td; 880 struct proc *proc_cur; 881 int error; 882 883 td = curthread; 884 proc_cur = td->td_proc; 885 886 if (proc_cur == proc_d) { 887 struct iovec iov = { 888 .iov_base = (caddr_t)data_d, 889 .iov_len = len, 890 }; 891 struct uio uio = { 892 .uio_iov = &iov, 893 .uio_iovcnt = 1, 894 .uio_offset = (off_t)data_s, 895 .uio_resid = len, 896 .uio_segflg = UIO_USERSPACE, 897 .uio_rw = UIO_READ, 898 .uio_td = td, 899 }; 900 901 PHOLD(proc_s); 902 error = proc_rwmem(proc_s, &uio); 903 PRELE(proc_s); 904 905 } else if (proc_cur == proc_s) { 906 struct iovec iov = { 907 .iov_base = (caddr_t)data_s, 908 .iov_len = len, 909 }; 910 struct uio uio = { 911 .uio_iov = &iov, 912 .uio_iovcnt = 1, 913 .uio_offset = (off_t)data_d, 914 .uio_resid = len, 915 .uio_segflg = UIO_USERSPACE, 916 .uio_rw = UIO_WRITE, 917 .uio_td = td, 918 }; 919 920 PHOLD(proc_d); 921 error = proc_rwmem(proc_d, &uio); 922 PRELE(proc_d); 923 } else { 924 error = EINVAL; 925 } 926 return (error); 927 } 928 929 static int 930 cuse_server_data_copy_locked(struct cuse_server *pcs, 931 struct cuse_client_command *pccmd, 932 struct cuse_data_chunk *pchk, int isread) 933 { 934 struct proc *p_proc; 935 int error; 936 937 p_proc = pccmd->proc_curr; 938 if (p_proc == NULL) 939 return (ENXIO); 940 941 if (pccmd->proc_refs < 0) 942 return (ENOMEM); 943 944 pccmd->proc_refs++; 945 946 cuse_server_unlock(pcs); 947 948 if (isread == 0) { 949 error = cuse_proc2proc_copy( 950 curthread->td_proc, pchk->local_ptr, 951 p_proc, pchk->peer_ptr, 952 pchk->length); 953 } else { 954 error = cuse_proc2proc_copy( 955 p_proc, pchk->peer_ptr, 956 curthread->td_proc, pchk->local_ptr, 957 pchk->length); 958 } 959 960 cuse_server_lock(pcs); 961 962 pccmd->proc_refs--; 963 964 if (pccmd->proc_curr == NULL) 965 cv_signal(&pccmd->cv); 966 967 return (error); 968 } 969 970 static int 971 cuse_alloc_unit_by_id_locked(struct cuse_server *pcs, int id) 972 { 973 int n; 974 int x = 0; 975 int match; 976 977 do { 978 for (match = n = 0; n != CUSE_DEVICES_MAX; n++) { 979 if (cuse_alloc_unit[n] != NULL) { 980 if ((cuse_alloc_unit_id[n] ^ id) & CUSE_ID_MASK) 981 continue; 982 if ((cuse_alloc_unit_id[n] & ~CUSE_ID_MASK) == x) { 983 x++; 984 match = 1; 985 } 986 } 987 } 988 } while (match); 989 990 if (x < 256) { 991 for (n = 0; n != CUSE_DEVICES_MAX; n++) { 992 if (cuse_alloc_unit[n] == NULL) { 993 cuse_alloc_unit[n] = pcs; 994 cuse_alloc_unit_id[n] = id | x; 995 return (x); 996 } 997 } 998 } 999 return (-1); 1000 } 1001 1002 static void 1003 cuse_server_wakeup_locked(struct cuse_server *pcs) 1004 { 1005 selwakeup(&pcs->selinfo); 1006 KNOTE_LOCKED(&pcs->selinfo.si_note, 0); 1007 } 1008 1009 static void 1010 cuse_server_wakeup_all_client_locked(struct cuse_server *pcs) 1011 { 1012 struct cuse_client *pcc; 1013 1014 TAILQ_FOREACH(pcc, &pcs->hcli, entry) { 1015 pcc->cflags |= (CUSE_CLI_KNOTE_NEED_READ | 1016 CUSE_CLI_KNOTE_NEED_WRITE); 1017 } 1018 cuse_server_wakeup_locked(pcs); 1019 } 1020 1021 static int 1022 cuse_free_unit_by_id_locked(struct cuse_server *pcs, int id) 1023 { 1024 int n; 1025 int found = 0; 1026 1027 for (n = 0; n != CUSE_DEVICES_MAX; n++) { 1028 if (cuse_alloc_unit[n] == pcs) { 1029 if (cuse_alloc_unit_id[n] == id || id == -1) { 1030 cuse_alloc_unit[n] = NULL; 1031 cuse_alloc_unit_id[n] = 0; 1032 found = 1; 1033 } 1034 } 1035 } 1036 1037 return (found ? 0 : EINVAL); 1038 } 1039 1040 static int 1041 cuse_server_ioctl(struct cdev *dev, unsigned long cmd, 1042 caddr_t data, int fflag, struct thread *td) 1043 { 1044 struct cuse_server *pcs; 1045 int error; 1046 1047 error = cuse_server_get(&pcs); 1048 if (error != 0) 1049 return (error); 1050 1051 switch (cmd) { 1052 struct cuse_client_command *pccmd; 1053 struct cuse_client *pcc; 1054 struct cuse_command *pcmd; 1055 struct cuse_alloc_info *pai; 1056 struct cuse_create_dev *pcd; 1057 struct cuse_server_dev *pcsd; 1058 struct cuse_data_chunk *pchk; 1059 int n; 1060 1061 case CUSE_IOCTL_GET_COMMAND: 1062 pcmd = (void *)data; 1063 1064 cuse_server_lock(pcs); 1065 1066 while ((pccmd = TAILQ_FIRST(&pcs->head)) == NULL) { 1067 error = cv_wait_sig(&pcs->cv, &pcs->mtx); 1068 1069 if (pcs->is_closing) 1070 error = ENXIO; 1071 1072 if (error) { 1073 cuse_server_unlock(pcs); 1074 return (error); 1075 } 1076 } 1077 1078 TAILQ_REMOVE(&pcs->head, pccmd, entry); 1079 pccmd->entry.tqe_prev = NULL; 1080 1081 pccmd->entered = curthread; 1082 1083 *pcmd = pccmd->sub; 1084 1085 cuse_server_unlock(pcs); 1086 1087 break; 1088 1089 case CUSE_IOCTL_SYNC_COMMAND: 1090 1091 cuse_server_lock(pcs); 1092 while ((pccmd = cuse_server_find_command(pcs, curthread)) != NULL) { 1093 /* send sync command */ 1094 pccmd->entered = NULL; 1095 pccmd->error = *(int *)data; 1096 pccmd->command = CUSE_CMD_SYNC; 1097 1098 /* signal peer, if any */ 1099 cv_signal(&pccmd->cv); 1100 } 1101 cuse_server_unlock(pcs); 1102 1103 break; 1104 1105 case CUSE_IOCTL_ALLOC_UNIT: 1106 1107 cuse_server_lock(pcs); 1108 n = cuse_alloc_unit_by_id_locked(pcs, 1109 CUSE_ID_DEFAULT(0)); 1110 cuse_server_unlock(pcs); 1111 1112 if (n < 0) 1113 error = ENOMEM; 1114 else 1115 *(int *)data = n; 1116 break; 1117 1118 case CUSE_IOCTL_ALLOC_UNIT_BY_ID: 1119 1120 n = *(int *)data; 1121 1122 n = (n & CUSE_ID_MASK); 1123 1124 cuse_server_lock(pcs); 1125 n = cuse_alloc_unit_by_id_locked(pcs, n); 1126 cuse_server_unlock(pcs); 1127 1128 if (n < 0) 1129 error = ENOMEM; 1130 else 1131 *(int *)data = n; 1132 break; 1133 1134 case CUSE_IOCTL_FREE_UNIT: 1135 1136 n = *(int *)data; 1137 1138 n = CUSE_ID_DEFAULT(n); 1139 1140 cuse_server_lock(pcs); 1141 error = cuse_free_unit_by_id_locked(pcs, n); 1142 cuse_server_unlock(pcs); 1143 break; 1144 1145 case CUSE_IOCTL_FREE_UNIT_BY_ID: 1146 1147 n = *(int *)data; 1148 1149 cuse_server_lock(pcs); 1150 error = cuse_free_unit_by_id_locked(pcs, n); 1151 cuse_server_unlock(pcs); 1152 break; 1153 1154 case CUSE_IOCTL_ALLOC_MEMORY: 1155 1156 pai = (void *)data; 1157 1158 if (pai->alloc_nr >= CUSE_ALLOC_UNIT_MAX) { 1159 error = ENOMEM; 1160 break; 1161 } 1162 if (pai->page_count > CUSE_ALLOC_PAGES_MAX) { 1163 error = ENOMEM; 1164 break; 1165 } 1166 error = cuse_server_alloc_memory(pcs, 1167 pai->alloc_nr, pai->page_count); 1168 break; 1169 1170 case CUSE_IOCTL_FREE_MEMORY: 1171 pai = (void *)data; 1172 1173 if (pai->alloc_nr >= CUSE_ALLOC_UNIT_MAX) { 1174 error = ENOMEM; 1175 break; 1176 } 1177 error = cuse_server_free_memory(pcs, pai->alloc_nr); 1178 break; 1179 1180 case CUSE_IOCTL_GET_SIG: 1181 1182 cuse_server_lock(pcs); 1183 pccmd = cuse_server_find_command(pcs, curthread); 1184 1185 if (pccmd != NULL) { 1186 n = pccmd->got_signal; 1187 pccmd->got_signal = 0; 1188 } else { 1189 n = 0; 1190 } 1191 cuse_server_unlock(pcs); 1192 1193 *(int *)data = n; 1194 1195 break; 1196 1197 case CUSE_IOCTL_SET_PFH: 1198 1199 cuse_server_lock(pcs); 1200 pccmd = cuse_server_find_command(pcs, curthread); 1201 1202 if (pccmd != NULL) { 1203 pcc = pccmd->client; 1204 for (n = 0; n != CUSE_CMD_MAX; n++) { 1205 pcc->cmds[n].sub.per_file_handle = *(uintptr_t *)data; 1206 } 1207 } else { 1208 error = ENXIO; 1209 } 1210 cuse_server_unlock(pcs); 1211 break; 1212 1213 case CUSE_IOCTL_CREATE_DEV: 1214 1215 error = priv_check(curthread, PRIV_DRIVER); 1216 if (error) 1217 break; 1218 1219 pcd = (void *)data; 1220 1221 /* filter input */ 1222 1223 pcd->devname[sizeof(pcd->devname) - 1] = 0; 1224 1225 if (pcd->devname[0] == 0) { 1226 error = EINVAL; 1227 break; 1228 } 1229 cuse_str_filter(pcd->devname); 1230 1231 pcd->permissions &= 0777; 1232 1233 /* try to allocate a character device */ 1234 1235 pcsd = malloc(sizeof(*pcsd), M_CUSE, M_WAITOK | M_ZERO); 1236 1237 pcsd->server = pcs; 1238 1239 pcsd->user_dev = pcd->dev; 1240 1241 pcsd->kern_dev = make_dev_credf(MAKEDEV_CHECKNAME, 1242 &cuse_client_devsw, 0, NULL, pcd->user_id, pcd->group_id, 1243 pcd->permissions, "%s", pcd->devname); 1244 1245 if (pcsd->kern_dev == NULL) { 1246 free(pcsd, M_CUSE); 1247 error = ENOMEM; 1248 break; 1249 } 1250 pcsd->kern_dev->si_drv1 = pcsd; 1251 1252 cuse_server_lock(pcs); 1253 TAILQ_INSERT_TAIL(&pcs->hdev, pcsd, entry); 1254 cuse_server_unlock(pcs); 1255 1256 break; 1257 1258 case CUSE_IOCTL_DESTROY_DEV: 1259 1260 error = priv_check(curthread, PRIV_DRIVER); 1261 if (error) 1262 break; 1263 1264 cuse_server_lock(pcs); 1265 1266 error = EINVAL; 1267 1268 pcsd = TAILQ_FIRST(&pcs->hdev); 1269 while (pcsd != NULL) { 1270 if (pcsd->user_dev == *(struct cuse_dev **)data) { 1271 TAILQ_REMOVE(&pcs->hdev, pcsd, entry); 1272 cuse_server_unlock(pcs); 1273 cuse_server_free_dev(pcsd); 1274 cuse_server_lock(pcs); 1275 error = 0; 1276 pcsd = TAILQ_FIRST(&pcs->hdev); 1277 } else { 1278 pcsd = TAILQ_NEXT(pcsd, entry); 1279 } 1280 } 1281 1282 cuse_server_unlock(pcs); 1283 break; 1284 1285 case CUSE_IOCTL_WRITE_DATA: 1286 case CUSE_IOCTL_READ_DATA: 1287 1288 cuse_server_lock(pcs); 1289 pchk = (struct cuse_data_chunk *)data; 1290 1291 pccmd = cuse_server_find_command(pcs, curthread); 1292 1293 if (pccmd == NULL) { 1294 error = ENXIO; /* invalid request */ 1295 } else if (pchk->peer_ptr < CUSE_BUF_MIN_PTR) { 1296 error = EFAULT; /* NULL pointer */ 1297 } else if (pchk->peer_ptr < CUSE_BUF_MAX_PTR) { 1298 error = cuse_server_ioctl_copy_locked(pcs, pccmd, 1299 pchk, cmd == CUSE_IOCTL_READ_DATA); 1300 } else { 1301 error = cuse_server_data_copy_locked(pcs, pccmd, 1302 pchk, cmd == CUSE_IOCTL_READ_DATA); 1303 } 1304 cuse_server_unlock(pcs); 1305 break; 1306 1307 case CUSE_IOCTL_SELWAKEUP: 1308 cuse_server_lock(pcs); 1309 /* 1310 * We don't know which direction caused the event. 1311 * Wakeup both! 1312 */ 1313 cuse_server_wakeup_all_client_locked(pcs); 1314 cuse_server_unlock(pcs); 1315 break; 1316 1317 default: 1318 error = ENXIO; 1319 break; 1320 } 1321 return (error); 1322 } 1323 1324 static int 1325 cuse_server_poll(struct cdev *dev, int events, struct thread *td) 1326 { 1327 return (events & (POLLHUP | POLLPRI | POLLIN | 1328 POLLRDNORM | POLLOUT | POLLWRNORM)); 1329 } 1330 1331 static int 1332 cuse_common_mmap_single(struct cuse_server *pcs, 1333 vm_ooffset_t *offset, vm_size_t size, struct vm_object **object) 1334 { 1335 struct cuse_memory *mem; 1336 int error; 1337 1338 /* verify size */ 1339 if ((size % PAGE_SIZE) != 0 || (size < PAGE_SIZE)) 1340 return (EINVAL); 1341 1342 cuse_server_lock(pcs); 1343 error = ENOMEM; 1344 1345 /* lookup memory structure, if any */ 1346 TAILQ_FOREACH(mem, &pcs->hmem, entry) { 1347 vm_ooffset_t min_off; 1348 vm_ooffset_t max_off; 1349 1350 min_off = (mem->alloc_nr << CUSE_ALLOC_UNIT_SHIFT); 1351 max_off = min_off + (PAGE_SIZE * mem->page_count); 1352 1353 if (*offset >= min_off && *offset < max_off) { 1354 /* range check size */ 1355 if (size > (max_off - *offset)) { 1356 error = EINVAL; 1357 } else { 1358 /* get new VM object offset to use */ 1359 *offset -= min_off; 1360 vm_object_reference(mem->object); 1361 *object = mem->object; 1362 error = 0; 1363 } 1364 break; 1365 } 1366 } 1367 cuse_server_unlock(pcs); 1368 return (error); 1369 } 1370 1371 static int 1372 cuse_server_mmap_single(struct cdev *dev, vm_ooffset_t *offset, 1373 vm_size_t size, struct vm_object **object, int nprot) 1374 { 1375 struct cuse_server *pcs; 1376 int error; 1377 1378 error = cuse_server_get(&pcs); 1379 if (error != 0) 1380 return (error); 1381 1382 return (cuse_common_mmap_single(pcs, offset, size, object)); 1383 } 1384 1385 /*------------------------------------------------------------------------* 1386 * CUSE CLIENT PART 1387 *------------------------------------------------------------------------*/ 1388 static void 1389 cuse_client_free(void *arg) 1390 { 1391 struct cuse_client *pcc = arg; 1392 struct cuse_client_command *pccmd; 1393 struct cuse_server *pcs; 1394 int n; 1395 1396 pcs = pcc->server; 1397 1398 cuse_server_lock(pcs); 1399 cuse_client_is_closing(pcc); 1400 TAILQ_REMOVE(&pcs->hcli, pcc, entry); 1401 cuse_server_unlock(pcs); 1402 1403 for (n = 0; n != CUSE_CMD_MAX; n++) { 1404 pccmd = &pcc->cmds[n]; 1405 1406 sx_destroy(&pccmd->sx); 1407 cv_destroy(&pccmd->cv); 1408 } 1409 1410 free(pcc, M_CUSE); 1411 1412 /* drop reference on server */ 1413 cuse_server_unref(pcs); 1414 } 1415 1416 static int 1417 cuse_client_open(struct cdev *dev, int fflags, int devtype, struct thread *td) 1418 { 1419 struct cuse_client_command *pccmd; 1420 struct cuse_server_dev *pcsd; 1421 struct cuse_client *pcc; 1422 struct cuse_server *pcs; 1423 struct cuse_dev *pcd; 1424 int error; 1425 int n; 1426 1427 pcsd = dev->si_drv1; 1428 if (pcsd != NULL) { 1429 pcs = pcsd->server; 1430 pcd = pcsd->user_dev; 1431 1432 cuse_server_lock(pcs); 1433 /* 1434 * Check that the refcount didn't wrap and that the 1435 * same process is not both client and server. This 1436 * can easily lead to deadlocks when destroying the 1437 * CUSE character device nodes: 1438 */ 1439 pcs->refs++; 1440 if (pcs->refs < 0 || pcs->pid == curproc->p_pid) { 1441 /* overflow or wrong PID */ 1442 pcs->refs--; 1443 cuse_server_unlock(pcs); 1444 return (EINVAL); 1445 } 1446 cuse_server_unlock(pcs); 1447 } else { 1448 return (EINVAL); 1449 } 1450 1451 pcc = malloc(sizeof(*pcc), M_CUSE, M_WAITOK | M_ZERO); 1452 if (devfs_set_cdevpriv(pcc, &cuse_client_free)) { 1453 printf("Cuse: Cannot set cdevpriv.\n"); 1454 /* drop reference on server */ 1455 cuse_server_unref(pcs); 1456 free(pcc, M_CUSE); 1457 return (ENOMEM); 1458 } 1459 pcc->fflags = fflags; 1460 pcc->server_dev = pcsd; 1461 pcc->server = pcs; 1462 1463 for (n = 0; n != CUSE_CMD_MAX; n++) { 1464 pccmd = &pcc->cmds[n]; 1465 1466 pccmd->sub.dev = pcd; 1467 pccmd->sub.command = n; 1468 pccmd->client = pcc; 1469 1470 sx_init(&pccmd->sx, "cuse-client-sx"); 1471 cv_init(&pccmd->cv, "cuse-client-cv"); 1472 } 1473 1474 cuse_server_lock(pcs); 1475 1476 /* cuse_client_free() assumes that the client is listed somewhere! */ 1477 /* always enqueue */ 1478 1479 TAILQ_INSERT_TAIL(&pcs->hcli, pcc, entry); 1480 1481 /* check if server is closing */ 1482 if ((pcs->is_closing != 0) || (dev->si_drv1 == NULL)) { 1483 error = EINVAL; 1484 } else { 1485 error = 0; 1486 } 1487 cuse_server_unlock(pcs); 1488 1489 if (error) { 1490 devfs_clear_cdevpriv(); /* XXX bugfix */ 1491 return (error); 1492 } 1493 pccmd = &pcc->cmds[CUSE_CMD_OPEN]; 1494 1495 cuse_cmd_lock(pccmd); 1496 1497 cuse_server_lock(pcs); 1498 cuse_client_send_command_locked(pccmd, 0, 0, pcc->fflags, 0); 1499 1500 error = cuse_client_receive_command_locked(pccmd, 0, 0); 1501 cuse_server_unlock(pcs); 1502 1503 if (error < 0) { 1504 error = cuse_convert_error(error); 1505 } else { 1506 error = 0; 1507 } 1508 1509 cuse_cmd_unlock(pccmd); 1510 1511 if (error) 1512 devfs_clear_cdevpriv(); /* XXX bugfix */ 1513 1514 return (error); 1515 } 1516 1517 static int 1518 cuse_client_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 1519 { 1520 struct cuse_client_command *pccmd; 1521 struct cuse_client *pcc; 1522 struct cuse_server *pcs; 1523 int error; 1524 1525 error = cuse_client_get(&pcc); 1526 if (error != 0) 1527 return (0); 1528 1529 pccmd = &pcc->cmds[CUSE_CMD_CLOSE]; 1530 pcs = pcc->server; 1531 1532 cuse_cmd_lock(pccmd); 1533 1534 cuse_server_lock(pcs); 1535 cuse_client_send_command_locked(pccmd, 0, 0, pcc->fflags, 0); 1536 1537 error = cuse_client_receive_command_locked(pccmd, 0, 0); 1538 cuse_cmd_unlock(pccmd); 1539 1540 cuse_client_is_closing(pcc); 1541 cuse_server_unlock(pcs); 1542 1543 return (0); 1544 } 1545 1546 static void 1547 cuse_client_kqfilter_poll(struct cdev *dev, struct cuse_client *pcc) 1548 { 1549 struct cuse_server *pcs = pcc->server; 1550 int temp; 1551 1552 cuse_server_lock(pcs); 1553 temp = (pcc->cflags & (CUSE_CLI_KNOTE_HAS_READ | 1554 CUSE_CLI_KNOTE_HAS_WRITE)); 1555 pcc->cflags &= ~(CUSE_CLI_KNOTE_NEED_READ | 1556 CUSE_CLI_KNOTE_NEED_WRITE); 1557 cuse_server_unlock(pcs); 1558 1559 if (temp != 0) { 1560 /* get the latest polling state from the server */ 1561 temp = cuse_client_poll(dev, POLLIN | POLLOUT, NULL); 1562 1563 if (temp & (POLLIN | POLLOUT)) { 1564 cuse_server_lock(pcs); 1565 if (temp & POLLIN) 1566 pcc->cflags |= CUSE_CLI_KNOTE_NEED_READ; 1567 if (temp & POLLOUT) 1568 pcc->cflags |= CUSE_CLI_KNOTE_NEED_WRITE; 1569 1570 /* make sure the "knote" gets woken up */ 1571 cuse_server_wakeup_locked(pcc->server); 1572 cuse_server_unlock(pcs); 1573 } 1574 } 1575 } 1576 1577 static int 1578 cuse_client_read(struct cdev *dev, struct uio *uio, int ioflag) 1579 { 1580 struct cuse_client_command *pccmd; 1581 struct cuse_client *pcc; 1582 struct cuse_server *pcs; 1583 int error; 1584 int len; 1585 1586 error = cuse_client_get(&pcc); 1587 if (error != 0) 1588 return (error); 1589 1590 pccmd = &pcc->cmds[CUSE_CMD_READ]; 1591 pcs = pcc->server; 1592 1593 if (uio->uio_segflg != UIO_USERSPACE) { 1594 return (EINVAL); 1595 } 1596 uio->uio_segflg = UIO_NOCOPY; 1597 1598 cuse_cmd_lock(pccmd); 1599 1600 while (uio->uio_resid != 0) { 1601 if (uio->uio_iov->iov_len > CUSE_LENGTH_MAX) { 1602 error = ENOMEM; 1603 break; 1604 } 1605 len = uio->uio_iov->iov_len; 1606 1607 cuse_server_lock(pcs); 1608 cuse_client_send_command_locked(pccmd, 1609 (uintptr_t)uio->uio_iov->iov_base, 1610 (unsigned long)(unsigned int)len, pcc->fflags, ioflag); 1611 1612 error = cuse_client_receive_command_locked(pccmd, 0, 0); 1613 cuse_server_unlock(pcs); 1614 1615 if (error < 0) { 1616 error = cuse_convert_error(error); 1617 break; 1618 } else if (error == len) { 1619 error = uiomove(NULL, error, uio); 1620 if (error) 1621 break; 1622 } else { 1623 error = uiomove(NULL, error, uio); 1624 break; 1625 } 1626 } 1627 cuse_cmd_unlock(pccmd); 1628 1629 uio->uio_segflg = UIO_USERSPACE;/* restore segment flag */ 1630 1631 if (error == EWOULDBLOCK) 1632 cuse_client_kqfilter_poll(dev, pcc); 1633 1634 return (error); 1635 } 1636 1637 static int 1638 cuse_client_write(struct cdev *dev, struct uio *uio, int ioflag) 1639 { 1640 struct cuse_client_command *pccmd; 1641 struct cuse_client *pcc; 1642 struct cuse_server *pcs; 1643 int error; 1644 int len; 1645 1646 error = cuse_client_get(&pcc); 1647 if (error != 0) 1648 return (error); 1649 1650 pccmd = &pcc->cmds[CUSE_CMD_WRITE]; 1651 pcs = pcc->server; 1652 1653 if (uio->uio_segflg != UIO_USERSPACE) { 1654 return (EINVAL); 1655 } 1656 uio->uio_segflg = UIO_NOCOPY; 1657 1658 cuse_cmd_lock(pccmd); 1659 1660 while (uio->uio_resid != 0) { 1661 if (uio->uio_iov->iov_len > CUSE_LENGTH_MAX) { 1662 error = ENOMEM; 1663 break; 1664 } 1665 len = uio->uio_iov->iov_len; 1666 1667 cuse_server_lock(pcs); 1668 cuse_client_send_command_locked(pccmd, 1669 (uintptr_t)uio->uio_iov->iov_base, 1670 (unsigned long)(unsigned int)len, pcc->fflags, ioflag); 1671 1672 error = cuse_client_receive_command_locked(pccmd, 0, 0); 1673 cuse_server_unlock(pcs); 1674 1675 if (error < 0) { 1676 error = cuse_convert_error(error); 1677 break; 1678 } else if (error == len) { 1679 error = uiomove(NULL, error, uio); 1680 if (error) 1681 break; 1682 } else { 1683 error = uiomove(NULL, error, uio); 1684 break; 1685 } 1686 } 1687 cuse_cmd_unlock(pccmd); 1688 1689 uio->uio_segflg = UIO_USERSPACE;/* restore segment flag */ 1690 1691 if (error == EWOULDBLOCK) 1692 cuse_client_kqfilter_poll(dev, pcc); 1693 1694 return (error); 1695 } 1696 1697 int 1698 cuse_client_ioctl(struct cdev *dev, unsigned long cmd, 1699 caddr_t data, int fflag, struct thread *td) 1700 { 1701 struct cuse_client_command *pccmd; 1702 struct cuse_client *pcc; 1703 struct cuse_server *pcs; 1704 int error; 1705 int len; 1706 1707 error = cuse_client_get(&pcc); 1708 if (error != 0) 1709 return (error); 1710 1711 len = IOCPARM_LEN(cmd); 1712 if (len > CUSE_BUFFER_MAX) 1713 return (ENOMEM); 1714 1715 pccmd = &pcc->cmds[CUSE_CMD_IOCTL]; 1716 pcs = pcc->server; 1717 1718 cuse_cmd_lock(pccmd); 1719 1720 if (cmd & (IOC_IN | IOC_VOID)) 1721 memcpy(pcc->ioctl_buffer, data, len); 1722 1723 /* 1724 * When the ioctl-length is zero drivers can pass information 1725 * through the data pointer of the ioctl. Make sure this information 1726 * is forwarded to the driver. 1727 */ 1728 1729 cuse_server_lock(pcs); 1730 cuse_client_send_command_locked(pccmd, 1731 (len == 0) ? *(long *)data : CUSE_BUF_MIN_PTR, 1732 (unsigned long)cmd, pcc->fflags, 1733 (fflag & O_NONBLOCK) ? IO_NDELAY : 0); 1734 1735 error = cuse_client_receive_command_locked(pccmd, data, len); 1736 cuse_server_unlock(pcs); 1737 1738 if (error < 0) { 1739 error = cuse_convert_error(error); 1740 } else { 1741 error = 0; 1742 } 1743 1744 if (cmd & IOC_OUT) 1745 memcpy(data, pcc->ioctl_buffer, len); 1746 1747 cuse_cmd_unlock(pccmd); 1748 1749 if (error == EWOULDBLOCK) 1750 cuse_client_kqfilter_poll(dev, pcc); 1751 1752 return (error); 1753 } 1754 1755 static int 1756 cuse_client_poll(struct cdev *dev, int events, struct thread *td) 1757 { 1758 struct cuse_client_command *pccmd; 1759 struct cuse_client *pcc; 1760 struct cuse_server *pcs; 1761 unsigned long temp; 1762 int error; 1763 int revents; 1764 1765 error = cuse_client_get(&pcc); 1766 if (error != 0) 1767 goto pollnval; 1768 1769 temp = 0; 1770 pcs = pcc->server; 1771 1772 if (events & (POLLPRI | POLLIN | POLLRDNORM)) 1773 temp |= CUSE_POLL_READ; 1774 1775 if (events & (POLLOUT | POLLWRNORM)) 1776 temp |= CUSE_POLL_WRITE; 1777 1778 if (events & POLLHUP) 1779 temp |= CUSE_POLL_ERROR; 1780 1781 pccmd = &pcc->cmds[CUSE_CMD_POLL]; 1782 1783 cuse_cmd_lock(pccmd); 1784 1785 /* Need to selrecord() first to not loose any events. */ 1786 if (temp != 0 && td != NULL) 1787 selrecord(td, &pcs->selinfo); 1788 1789 cuse_server_lock(pcs); 1790 cuse_client_send_command_locked(pccmd, 1791 0, temp, pcc->fflags, IO_NDELAY); 1792 1793 error = cuse_client_receive_command_locked(pccmd, 0, 0); 1794 cuse_server_unlock(pcs); 1795 1796 cuse_cmd_unlock(pccmd); 1797 1798 if (error < 0) { 1799 goto pollnval; 1800 } else { 1801 revents = 0; 1802 if (error & CUSE_POLL_READ) 1803 revents |= (events & (POLLPRI | POLLIN | POLLRDNORM)); 1804 if (error & CUSE_POLL_WRITE) 1805 revents |= (events & (POLLOUT | POLLWRNORM)); 1806 if (error & CUSE_POLL_ERROR) 1807 revents |= (events & POLLHUP); 1808 } 1809 return (revents); 1810 1811 pollnval: 1812 /* XXX many clients don't understand POLLNVAL */ 1813 return (events & (POLLHUP | POLLPRI | POLLIN | 1814 POLLRDNORM | POLLOUT | POLLWRNORM)); 1815 } 1816 1817 static int 1818 cuse_client_mmap_single(struct cdev *dev, vm_ooffset_t *offset, 1819 vm_size_t size, struct vm_object **object, int nprot) 1820 { 1821 struct cuse_client *pcc; 1822 int error; 1823 1824 error = cuse_client_get(&pcc); 1825 if (error != 0) 1826 return (error); 1827 1828 return (cuse_common_mmap_single(pcc->server, offset, size, object)); 1829 } 1830 1831 static void 1832 cuse_client_kqfilter_read_detach(struct knote *kn) 1833 { 1834 struct cuse_client *pcc; 1835 struct cuse_server *pcs; 1836 1837 pcc = kn->kn_hook; 1838 pcs = pcc->server; 1839 1840 cuse_server_lock(pcs); 1841 knlist_remove(&pcs->selinfo.si_note, kn, 1); 1842 cuse_server_unlock(pcs); 1843 } 1844 1845 static void 1846 cuse_client_kqfilter_write_detach(struct knote *kn) 1847 { 1848 struct cuse_client *pcc; 1849 struct cuse_server *pcs; 1850 1851 pcc = kn->kn_hook; 1852 pcs = pcc->server; 1853 1854 cuse_server_lock(pcs); 1855 knlist_remove(&pcs->selinfo.si_note, kn, 1); 1856 cuse_server_unlock(pcs); 1857 } 1858 1859 static int 1860 cuse_client_kqfilter_read_event(struct knote *kn, long hint) 1861 { 1862 struct cuse_client *pcc; 1863 1864 pcc = kn->kn_hook; 1865 1866 mtx_assert(&pcc->server->mtx, MA_OWNED); 1867 1868 return ((pcc->cflags & CUSE_CLI_KNOTE_NEED_READ) ? 1 : 0); 1869 } 1870 1871 static int 1872 cuse_client_kqfilter_write_event(struct knote *kn, long hint) 1873 { 1874 struct cuse_client *pcc; 1875 1876 pcc = kn->kn_hook; 1877 1878 mtx_assert(&pcc->server->mtx, MA_OWNED); 1879 1880 return ((pcc->cflags & CUSE_CLI_KNOTE_NEED_WRITE) ? 1 : 0); 1881 } 1882 1883 static int 1884 cuse_client_kqfilter(struct cdev *dev, struct knote *kn) 1885 { 1886 struct cuse_client *pcc; 1887 struct cuse_server *pcs; 1888 int error; 1889 1890 error = cuse_client_get(&pcc); 1891 if (error != 0) 1892 return (error); 1893 1894 pcs = pcc->server; 1895 1896 cuse_server_lock(pcs); 1897 switch (kn->kn_filter) { 1898 case EVFILT_READ: 1899 pcc->cflags |= CUSE_CLI_KNOTE_HAS_READ; 1900 kn->kn_hook = pcc; 1901 kn->kn_fop = &cuse_client_kqfilter_read_ops; 1902 knlist_add(&pcs->selinfo.si_note, kn, 1); 1903 break; 1904 case EVFILT_WRITE: 1905 pcc->cflags |= CUSE_CLI_KNOTE_HAS_WRITE; 1906 kn->kn_hook = pcc; 1907 kn->kn_fop = &cuse_client_kqfilter_write_ops; 1908 knlist_add(&pcs->selinfo.si_note, kn, 1); 1909 break; 1910 default: 1911 error = EINVAL; 1912 break; 1913 } 1914 cuse_server_unlock(pcs); 1915 1916 if (error == 0) 1917 cuse_client_kqfilter_poll(dev, pcc); 1918 return (error); 1919 } 1920