1 /*- 2 * Copyright (c) 2012 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Edward Tomasz Napierala under sponsorship 6 * from the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/condvar.h> 36 #include <sys/conf.h> 37 #include <sys/endian.h> 38 #include <sys/eventhandler.h> 39 #include <sys/file.h> 40 #include <sys/kernel.h> 41 #include <sys/kthread.h> 42 #include <sys/lock.h> 43 #include <sys/malloc.h> 44 #include <sys/mutex.h> 45 #include <sys/module.h> 46 #include <sys/socket.h> 47 #include <sys/sysctl.h> 48 #include <sys/systm.h> 49 #include <sys/sx.h> 50 #include <vm/uma.h> 51 52 #include <cam/cam.h> 53 #include <cam/cam_ccb.h> 54 #include <cam/cam_xpt.h> 55 #include <cam/cam_debug.h> 56 #include <cam/cam_sim.h> 57 #include <cam/cam_xpt_sim.h> 58 #include <cam/cam_xpt_periph.h> 59 #include <cam/cam_periph.h> 60 #include <cam/scsi/scsi_all.h> 61 #include <cam/scsi/scsi_message.h> 62 63 #include <dev/iscsi/icl.h> 64 #include <dev/iscsi/icl_wrappers.h> 65 #include <dev/iscsi/iscsi_ioctl.h> 66 #include <dev/iscsi/iscsi_proto.h> 67 #include <dev/iscsi/iscsi.h> 68 69 #ifdef ICL_KERNEL_PROXY 70 #include <sys/socketvar.h> 71 #endif 72 73 #ifdef ICL_KERNEL_PROXY 74 FEATURE(iscsi_kernel_proxy, "iSCSI initiator built with ICL_KERNEL_PROXY"); 75 #endif 76 77 /* 78 * XXX: This is global so the iscsi_unload() can access it. 79 * Think about how to do this properly. 80 */ 81 static struct iscsi_softc *sc; 82 83 SYSCTL_NODE(_kern, OID_AUTO, iscsi, CTLFLAG_RD, 0, "iSCSI initiator"); 84 static int debug = 1; 85 SYSCTL_INT(_kern_iscsi, OID_AUTO, debug, CTLFLAG_RWTUN, 86 &debug, 0, "Enable debug messages"); 87 static int ping_timeout = 5; 88 SYSCTL_INT(_kern_iscsi, OID_AUTO, ping_timeout, CTLFLAG_RWTUN, &ping_timeout, 89 0, "Timeout for ping (NOP-Out) requests, in seconds"); 90 static int iscsid_timeout = 60; 91 SYSCTL_INT(_kern_iscsi, OID_AUTO, iscsid_timeout, CTLFLAG_RWTUN, &iscsid_timeout, 92 0, "Time to wait for iscsid(8) to handle reconnection, in seconds"); 93 static int login_timeout = 60; 94 SYSCTL_INT(_kern_iscsi, OID_AUTO, login_timeout, CTLFLAG_RWTUN, &login_timeout, 95 0, "Time to wait for iscsid(8) to finish Login Phase, in seconds"); 96 static int maxtags = 255; 97 SYSCTL_INT(_kern_iscsi, OID_AUTO, maxtags, CTLFLAG_RWTUN, &maxtags, 98 0, "Max number of IO requests queued"); 99 static int fail_on_disconnection = 0; 100 SYSCTL_INT(_kern_iscsi, OID_AUTO, fail_on_disconnection, CTLFLAG_RWTUN, 101 &fail_on_disconnection, 0, "Destroy CAM SIM on connection failure"); 102 static int fail_on_shutdown = 1; 103 SYSCTL_INT(_kern_iscsi, OID_AUTO, fail_on_shutdown, CTLFLAG_RWTUN, 104 &fail_on_shutdown, 0, "Fail disconnected sessions on shutdown"); 105 106 static MALLOC_DEFINE(M_ISCSI, "iSCSI", "iSCSI initiator"); 107 static uma_zone_t iscsi_outstanding_zone; 108 109 #define CONN_SESSION(X) ((struct iscsi_session *)X->ic_prv0) 110 #define PDU_SESSION(X) (CONN_SESSION(X->ip_conn)) 111 112 #define ISCSI_DEBUG(X, ...) \ 113 do { \ 114 if (debug > 1) \ 115 printf("%s: " X "\n", __func__, ## __VA_ARGS__);\ 116 } while (0) 117 118 #define ISCSI_WARN(X, ...) \ 119 do { \ 120 if (debug > 0) { \ 121 printf("WARNING: %s: " X "\n", \ 122 __func__, ## __VA_ARGS__); \ 123 } \ 124 } while (0) 125 126 #define ISCSI_SESSION_DEBUG(S, X, ...) \ 127 do { \ 128 if (debug > 1) { \ 129 printf("%s: %s (%s): " X "\n", \ 130 __func__, S->is_conf.isc_target_addr, \ 131 S->is_conf.isc_target, ## __VA_ARGS__); \ 132 } \ 133 } while (0) 134 135 #define ISCSI_SESSION_WARN(S, X, ...) \ 136 do { \ 137 if (debug > 0) { \ 138 printf("WARNING: %s (%s): " X "\n", \ 139 S->is_conf.isc_target_addr, \ 140 S->is_conf.isc_target, ## __VA_ARGS__); \ 141 } \ 142 } while (0) 143 144 #define ISCSI_SESSION_LOCK(X) mtx_lock(&X->is_lock) 145 #define ISCSI_SESSION_UNLOCK(X) mtx_unlock(&X->is_lock) 146 #define ISCSI_SESSION_LOCK_ASSERT(X) mtx_assert(&X->is_lock, MA_OWNED) 147 #define ISCSI_SESSION_LOCK_ASSERT_NOT(X) mtx_assert(&X->is_lock, MA_NOTOWNED) 148 149 static int iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, 150 int mode, struct thread *td); 151 152 static struct cdevsw iscsi_cdevsw = { 153 .d_version = D_VERSION, 154 .d_ioctl = iscsi_ioctl, 155 .d_name = "iscsi", 156 }; 157 158 static void iscsi_pdu_queue_locked(struct icl_pdu *request); 159 static void iscsi_pdu_queue(struct icl_pdu *request); 160 static void iscsi_pdu_update_statsn(const struct icl_pdu *response); 161 static void iscsi_pdu_handle_nop_in(struct icl_pdu *response); 162 static void iscsi_pdu_handle_scsi_response(struct icl_pdu *response); 163 static void iscsi_pdu_handle_task_response(struct icl_pdu *response); 164 static void iscsi_pdu_handle_data_in(struct icl_pdu *response); 165 static void iscsi_pdu_handle_logout_response(struct icl_pdu *response); 166 static void iscsi_pdu_handle_r2t(struct icl_pdu *response); 167 static void iscsi_pdu_handle_async_message(struct icl_pdu *response); 168 static void iscsi_pdu_handle_reject(struct icl_pdu *response); 169 static void iscsi_session_reconnect(struct iscsi_session *is); 170 static void iscsi_session_terminate(struct iscsi_session *is); 171 static void iscsi_action(struct cam_sim *sim, union ccb *ccb); 172 static void iscsi_poll(struct cam_sim *sim); 173 static struct iscsi_outstanding *iscsi_outstanding_find(struct iscsi_session *is, 174 uint32_t initiator_task_tag); 175 static struct iscsi_outstanding *iscsi_outstanding_add(struct iscsi_session *is, 176 struct icl_pdu *request, union ccb *ccb, 177 uint32_t *initiator_task_tagp); 178 static void iscsi_outstanding_remove(struct iscsi_session *is, 179 struct iscsi_outstanding *io); 180 181 static bool 182 iscsi_pdu_prepare(struct icl_pdu *request) 183 { 184 struct iscsi_session *is; 185 struct iscsi_bhs_scsi_command *bhssc; 186 187 is = PDU_SESSION(request); 188 189 ISCSI_SESSION_LOCK_ASSERT(is); 190 191 /* 192 * We're only using fields common for all the request 193 * (initiator -> target) PDUs. 194 */ 195 bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs; 196 197 /* 198 * Data-Out PDU does not contain CmdSN. 199 */ 200 if (bhssc->bhssc_opcode != ISCSI_BHS_OPCODE_SCSI_DATA_OUT) { 201 if (ISCSI_SNGT(is->is_cmdsn, is->is_maxcmdsn) && 202 (bhssc->bhssc_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0) { 203 /* 204 * Current MaxCmdSN prevents us from sending any more 205 * SCSI Command PDUs to the target; postpone the PDU. 206 * It will get resent by either iscsi_pdu_queue(), 207 * or by maintenance thread. 208 */ 209 #if 0 210 ISCSI_SESSION_DEBUG(is, "postponing send, CmdSN %u, " 211 "ExpCmdSN %u, MaxCmdSN %u, opcode 0x%x", 212 is->is_cmdsn, is->is_expcmdsn, is->is_maxcmdsn, 213 bhssc->bhssc_opcode); 214 #endif 215 return (true); 216 } 217 bhssc->bhssc_cmdsn = htonl(is->is_cmdsn); 218 if ((bhssc->bhssc_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0) 219 is->is_cmdsn++; 220 } 221 bhssc->bhssc_expstatsn = htonl(is->is_statsn + 1); 222 223 return (false); 224 } 225 226 static void 227 iscsi_session_send_postponed(struct iscsi_session *is) 228 { 229 struct icl_pdu *request; 230 bool postpone; 231 232 ISCSI_SESSION_LOCK_ASSERT(is); 233 234 if (STAILQ_EMPTY(&is->is_postponed)) 235 return; 236 while ((request = STAILQ_FIRST(&is->is_postponed)) != NULL) { 237 postpone = iscsi_pdu_prepare(request); 238 if (postpone) 239 return; 240 STAILQ_REMOVE_HEAD(&is->is_postponed, ip_next); 241 icl_pdu_queue(request); 242 } 243 xpt_release_simq(is->is_sim, 1); 244 } 245 246 static void 247 iscsi_pdu_queue_locked(struct icl_pdu *request) 248 { 249 struct iscsi_session *is; 250 bool postpone; 251 252 is = PDU_SESSION(request); 253 ISCSI_SESSION_LOCK_ASSERT(is); 254 iscsi_session_send_postponed(is); 255 postpone = iscsi_pdu_prepare(request); 256 if (postpone) { 257 if (STAILQ_EMPTY(&is->is_postponed)) 258 xpt_freeze_simq(is->is_sim, 1); 259 STAILQ_INSERT_TAIL(&is->is_postponed, request, ip_next); 260 return; 261 } 262 icl_pdu_queue(request); 263 } 264 265 static void 266 iscsi_pdu_queue(struct icl_pdu *request) 267 { 268 struct iscsi_session *is; 269 270 is = PDU_SESSION(request); 271 ISCSI_SESSION_LOCK(is); 272 iscsi_pdu_queue_locked(request); 273 ISCSI_SESSION_UNLOCK(is); 274 } 275 276 static void 277 iscsi_session_logout(struct iscsi_session *is) 278 { 279 struct icl_pdu *request; 280 struct iscsi_bhs_logout_request *bhslr; 281 282 request = icl_pdu_new(is->is_conn, M_NOWAIT); 283 if (request == NULL) 284 return; 285 286 bhslr = (struct iscsi_bhs_logout_request *)request->ip_bhs; 287 bhslr->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_REQUEST; 288 bhslr->bhslr_reason = BHSLR_REASON_CLOSE_SESSION; 289 iscsi_pdu_queue_locked(request); 290 } 291 292 static void 293 iscsi_session_terminate_task(struct iscsi_session *is, 294 struct iscsi_outstanding *io, cam_status status) 295 { 296 297 ISCSI_SESSION_LOCK_ASSERT(is); 298 299 if (io->io_ccb != NULL) { 300 io->io_ccb->ccb_h.status &= ~(CAM_SIM_QUEUED | CAM_STATUS_MASK); 301 io->io_ccb->ccb_h.status |= status; 302 if ((io->io_ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 303 io->io_ccb->ccb_h.status |= CAM_DEV_QFRZN; 304 xpt_freeze_devq(io->io_ccb->ccb_h.path, 1); 305 ISCSI_SESSION_DEBUG(is, "freezing devq"); 306 } 307 xpt_done(io->io_ccb); 308 } 309 iscsi_outstanding_remove(is, io); 310 } 311 312 static void 313 iscsi_session_terminate_tasks(struct iscsi_session *is, cam_status status) 314 { 315 struct iscsi_outstanding *io, *tmp; 316 317 ISCSI_SESSION_LOCK_ASSERT(is); 318 319 TAILQ_FOREACH_SAFE(io, &is->is_outstanding, io_next, tmp) { 320 iscsi_session_terminate_task(is, io, status); 321 } 322 } 323 324 static void 325 iscsi_session_cleanup(struct iscsi_session *is, bool destroy_sim) 326 { 327 struct icl_pdu *pdu; 328 329 ISCSI_SESSION_LOCK_ASSERT(is); 330 331 /* 332 * Don't queue any new PDUs. 333 */ 334 if (is->is_sim != NULL && is->is_simq_frozen == false) { 335 ISCSI_SESSION_DEBUG(is, "freezing"); 336 xpt_freeze_simq(is->is_sim, 1); 337 is->is_simq_frozen = true; 338 } 339 340 /* 341 * Remove postponed PDUs. 342 */ 343 if (!STAILQ_EMPTY(&is->is_postponed)) 344 xpt_release_simq(is->is_sim, 1); 345 while ((pdu = STAILQ_FIRST(&is->is_postponed)) != NULL) { 346 STAILQ_REMOVE_HEAD(&is->is_postponed, ip_next); 347 icl_pdu_free(pdu); 348 } 349 350 if (destroy_sim == false) { 351 /* 352 * Terminate SCSI tasks, asking CAM to requeue them. 353 */ 354 iscsi_session_terminate_tasks(is, CAM_REQUEUE_REQ); 355 return; 356 } 357 358 iscsi_session_terminate_tasks(is, CAM_DEV_NOT_THERE); 359 360 if (is->is_sim == NULL) 361 return; 362 363 ISCSI_SESSION_DEBUG(is, "deregistering SIM"); 364 xpt_async(AC_LOST_DEVICE, is->is_path, NULL); 365 366 if (is->is_simq_frozen) { 367 xpt_release_simq(is->is_sim, 1); 368 is->is_simq_frozen = false; 369 } 370 371 xpt_free_path(is->is_path); 372 is->is_path = NULL; 373 xpt_bus_deregister(cam_sim_path(is->is_sim)); 374 cam_sim_free(is->is_sim, TRUE /*free_devq*/); 375 is->is_sim = NULL; 376 is->is_devq = NULL; 377 } 378 379 static void 380 iscsi_maintenance_thread_reconnect(struct iscsi_session *is) 381 { 382 383 icl_conn_close(is->is_conn); 384 385 ISCSI_SESSION_LOCK(is); 386 387 is->is_connected = false; 388 is->is_reconnecting = false; 389 is->is_login_phase = false; 390 391 #ifdef ICL_KERNEL_PROXY 392 if (is->is_login_pdu != NULL) { 393 icl_pdu_free(is->is_login_pdu); 394 is->is_login_pdu = NULL; 395 } 396 cv_signal(&is->is_login_cv); 397 #endif 398 399 if (fail_on_disconnection) { 400 ISCSI_SESSION_DEBUG(is, "connection failed, destroying devices"); 401 iscsi_session_cleanup(is, true); 402 } else { 403 iscsi_session_cleanup(is, false); 404 } 405 406 KASSERT(TAILQ_EMPTY(&is->is_outstanding), 407 ("destroying session with active tasks")); 408 KASSERT(STAILQ_EMPTY(&is->is_postponed), 409 ("destroying session with postponed PDUs")); 410 411 if (is->is_conf.isc_enable == 0 && is->is_conf.isc_discovery == 0) { 412 ISCSI_SESSION_UNLOCK(is); 413 return; 414 } 415 416 /* 417 * Request immediate reconnection from iscsid(8). 418 */ 419 //ISCSI_SESSION_DEBUG(is, "waking up iscsid(8)"); 420 is->is_waiting_for_iscsid = true; 421 strlcpy(is->is_reason, "Waiting for iscsid(8)", sizeof(is->is_reason)); 422 is->is_timeout = 0; 423 ISCSI_SESSION_UNLOCK(is); 424 cv_signal(&is->is_softc->sc_cv); 425 } 426 427 static void 428 iscsi_maintenance_thread_terminate(struct iscsi_session *is) 429 { 430 struct iscsi_softc *sc; 431 432 sc = is->is_softc; 433 sx_xlock(&sc->sc_lock); 434 TAILQ_REMOVE(&sc->sc_sessions, is, is_next); 435 sx_xunlock(&sc->sc_lock); 436 437 icl_conn_close(is->is_conn); 438 callout_drain(&is->is_callout); 439 440 ISCSI_SESSION_LOCK(is); 441 442 KASSERT(is->is_terminating, ("is_terminating == false")); 443 444 #ifdef ICL_KERNEL_PROXY 445 if (is->is_login_pdu != NULL) { 446 icl_pdu_free(is->is_login_pdu); 447 is->is_login_pdu = NULL; 448 } 449 cv_signal(&is->is_login_cv); 450 #endif 451 452 iscsi_session_cleanup(is, true); 453 454 KASSERT(TAILQ_EMPTY(&is->is_outstanding), 455 ("destroying session with active tasks")); 456 KASSERT(STAILQ_EMPTY(&is->is_postponed), 457 ("destroying session with postponed PDUs")); 458 459 ISCSI_SESSION_UNLOCK(is); 460 461 icl_conn_free(is->is_conn); 462 mtx_destroy(&is->is_lock); 463 cv_destroy(&is->is_maintenance_cv); 464 #ifdef ICL_KERNEL_PROXY 465 cv_destroy(&is->is_login_cv); 466 #endif 467 468 ISCSI_SESSION_DEBUG(is, "terminated"); 469 free(is, M_ISCSI); 470 471 /* 472 * The iscsi_unload() routine might be waiting. 473 */ 474 cv_signal(&sc->sc_cv); 475 } 476 477 static void 478 iscsi_maintenance_thread(void *arg) 479 { 480 struct iscsi_session *is = arg; 481 482 ISCSI_SESSION_LOCK(is); 483 for (;;) { 484 if (is->is_reconnecting == false && 485 is->is_terminating == false && 486 (STAILQ_EMPTY(&is->is_postponed) || 487 ISCSI_SNGT(is->is_cmdsn, is->is_maxcmdsn))) 488 cv_wait(&is->is_maintenance_cv, &is->is_lock); 489 490 /* Terminate supersedes reconnect. */ 491 if (is->is_terminating) { 492 ISCSI_SESSION_UNLOCK(is); 493 iscsi_maintenance_thread_terminate(is); 494 kthread_exit(); 495 return; 496 } 497 498 if (is->is_reconnecting) { 499 ISCSI_SESSION_UNLOCK(is); 500 iscsi_maintenance_thread_reconnect(is); 501 ISCSI_SESSION_LOCK(is); 502 continue; 503 } 504 505 iscsi_session_send_postponed(is); 506 } 507 ISCSI_SESSION_UNLOCK(is); 508 } 509 510 static void 511 iscsi_session_reconnect(struct iscsi_session *is) 512 { 513 514 /* 515 * XXX: We can't use locking here, because 516 * it's being called from various contexts. 517 * Hope it doesn't break anything. 518 */ 519 if (is->is_reconnecting) 520 return; 521 522 is->is_reconnecting = true; 523 cv_signal(&is->is_maintenance_cv); 524 } 525 526 static void 527 iscsi_session_terminate(struct iscsi_session *is) 528 { 529 530 if (is->is_terminating) 531 return; 532 533 is->is_terminating = true; 534 535 #if 0 536 iscsi_session_logout(is); 537 #endif 538 cv_signal(&is->is_maintenance_cv); 539 } 540 541 static void 542 iscsi_callout(void *context) 543 { 544 struct icl_pdu *request; 545 struct iscsi_bhs_nop_out *bhsno; 546 struct iscsi_session *is; 547 bool reconnect_needed = false; 548 549 is = context; 550 551 ISCSI_SESSION_LOCK(is); 552 if (is->is_terminating) { 553 ISCSI_SESSION_UNLOCK(is); 554 return; 555 } 556 557 callout_schedule(&is->is_callout, 1 * hz); 558 559 if (is->is_conf.isc_enable == 0) 560 goto out; 561 562 is->is_timeout++; 563 564 if (is->is_waiting_for_iscsid) { 565 if (iscsid_timeout > 0 && is->is_timeout > iscsid_timeout) { 566 ISCSI_SESSION_WARN(is, "timed out waiting for iscsid(8) " 567 "for %d seconds; reconnecting", 568 is->is_timeout); 569 reconnect_needed = true; 570 } 571 goto out; 572 } 573 574 if (is->is_login_phase) { 575 if (login_timeout > 0 && is->is_timeout > login_timeout) { 576 ISCSI_SESSION_WARN(is, "login timed out after %d seconds; " 577 "reconnecting", is->is_timeout); 578 reconnect_needed = true; 579 } 580 goto out; 581 } 582 583 if (ping_timeout <= 0) { 584 /* 585 * Pings are disabled. Don't send NOP-Out in this case. 586 * Reset the timeout, to avoid triggering reconnection, 587 * should the user decide to reenable them. 588 */ 589 is->is_timeout = 0; 590 goto out; 591 } 592 593 if (is->is_timeout >= ping_timeout) { 594 ISCSI_SESSION_WARN(is, "no ping reply (NOP-In) after %d seconds; " 595 "reconnecting", ping_timeout); 596 reconnect_needed = true; 597 goto out; 598 } 599 600 ISCSI_SESSION_UNLOCK(is); 601 602 /* 603 * If the ping was reset less than one second ago - which means 604 * that we've received some PDU during the last second - assume 605 * the traffic flows correctly and don't bother sending a NOP-Out. 606 * 607 * (It's 2 - one for one second, and one for incrementing is_timeout 608 * earlier in this routine.) 609 */ 610 if (is->is_timeout < 2) 611 return; 612 613 request = icl_pdu_new(is->is_conn, M_NOWAIT); 614 if (request == NULL) { 615 ISCSI_SESSION_WARN(is, "failed to allocate PDU"); 616 return; 617 } 618 bhsno = (struct iscsi_bhs_nop_out *)request->ip_bhs; 619 bhsno->bhsno_opcode = ISCSI_BHS_OPCODE_NOP_OUT | 620 ISCSI_BHS_OPCODE_IMMEDIATE; 621 bhsno->bhsno_flags = 0x80; 622 bhsno->bhsno_target_transfer_tag = 0xffffffff; 623 iscsi_pdu_queue(request); 624 return; 625 626 out: 627 if (is->is_terminating) { 628 ISCSI_SESSION_UNLOCK(is); 629 return; 630 } 631 632 ISCSI_SESSION_UNLOCK(is); 633 634 if (reconnect_needed) 635 iscsi_session_reconnect(is); 636 } 637 638 static void 639 iscsi_pdu_update_statsn(const struct icl_pdu *response) 640 { 641 const struct iscsi_bhs_data_in *bhsdi; 642 struct iscsi_session *is; 643 uint32_t expcmdsn, maxcmdsn, statsn; 644 645 is = PDU_SESSION(response); 646 647 ISCSI_SESSION_LOCK_ASSERT(is); 648 649 /* 650 * We're only using fields common for all the response 651 * (target -> initiator) PDUs. 652 */ 653 bhsdi = (const struct iscsi_bhs_data_in *)response->ip_bhs; 654 /* 655 * Ok, I lied. In case of Data-In, "The fields StatSN, Status, 656 * and Residual Count only have meaningful content if the S bit 657 * is set to 1", so we also need to check the bit specific for 658 * Data-In PDU. 659 */ 660 if (bhsdi->bhsdi_opcode != ISCSI_BHS_OPCODE_SCSI_DATA_IN || 661 (bhsdi->bhsdi_flags & BHSDI_FLAGS_S) != 0) { 662 statsn = ntohl(bhsdi->bhsdi_statsn); 663 if (statsn != is->is_statsn && statsn != (is->is_statsn + 1)) { 664 /* XXX: This is normal situation for MCS */ 665 ISCSI_SESSION_WARN(is, "PDU 0x%x StatSN %u != " 666 "session ExpStatSN %u (or + 1); reconnecting", 667 bhsdi->bhsdi_opcode, statsn, is->is_statsn); 668 iscsi_session_reconnect(is); 669 } 670 if (ISCSI_SNGT(statsn, is->is_statsn)) 671 is->is_statsn = statsn; 672 } 673 674 expcmdsn = ntohl(bhsdi->bhsdi_expcmdsn); 675 maxcmdsn = ntohl(bhsdi->bhsdi_maxcmdsn); 676 677 if (ISCSI_SNLT(maxcmdsn + 1, expcmdsn)) { 678 ISCSI_SESSION_DEBUG(is, 679 "PDU MaxCmdSN %u + 1 < PDU ExpCmdSN %u; ignoring", 680 maxcmdsn, expcmdsn); 681 } else { 682 if (ISCSI_SNGT(maxcmdsn, is->is_maxcmdsn)) { 683 is->is_maxcmdsn = maxcmdsn; 684 685 /* 686 * Command window increased; kick the maintanance thread 687 * to send out postponed commands. 688 */ 689 if (!STAILQ_EMPTY(&is->is_postponed)) 690 cv_signal(&is->is_maintenance_cv); 691 } else if (ISCSI_SNLT(maxcmdsn, is->is_maxcmdsn)) { 692 /* XXX: This is normal situation for MCS */ 693 ISCSI_SESSION_DEBUG(is, 694 "PDU MaxCmdSN %u < session MaxCmdSN %u; ignoring", 695 maxcmdsn, is->is_maxcmdsn); 696 } 697 698 if (ISCSI_SNGT(expcmdsn, is->is_expcmdsn)) { 699 is->is_expcmdsn = expcmdsn; 700 } else if (ISCSI_SNLT(expcmdsn, is->is_expcmdsn)) { 701 /* XXX: This is normal situation for MCS */ 702 ISCSI_SESSION_DEBUG(is, 703 "PDU ExpCmdSN %u < session ExpCmdSN %u; ignoring", 704 expcmdsn, is->is_expcmdsn); 705 } 706 } 707 708 /* 709 * Every incoming PDU - not just NOP-In - resets the ping timer. 710 * The purpose of the timeout is to reset the connection when it stalls; 711 * we don't want this to happen when NOP-In or NOP-Out ends up delayed 712 * in some queue. 713 */ 714 is->is_timeout = 0; 715 } 716 717 static void 718 iscsi_receive_callback(struct icl_pdu *response) 719 { 720 struct iscsi_session *is; 721 722 is = PDU_SESSION(response); 723 724 ISCSI_SESSION_LOCK(is); 725 726 iscsi_pdu_update_statsn(response); 727 728 #ifdef ICL_KERNEL_PROXY 729 if (is->is_login_phase) { 730 if (is->is_login_pdu == NULL) 731 is->is_login_pdu = response; 732 else 733 icl_pdu_free(response); 734 ISCSI_SESSION_UNLOCK(is); 735 cv_signal(&is->is_login_cv); 736 return; 737 } 738 #endif 739 740 /* 741 * The handling routine is responsible for freeing the PDU 742 * when it's no longer needed. 743 */ 744 switch (response->ip_bhs->bhs_opcode) { 745 case ISCSI_BHS_OPCODE_NOP_IN: 746 iscsi_pdu_handle_nop_in(response); 747 ISCSI_SESSION_UNLOCK(is); 748 break; 749 case ISCSI_BHS_OPCODE_SCSI_RESPONSE: 750 iscsi_pdu_handle_scsi_response(response); 751 /* Session lock dropped inside. */ 752 ISCSI_SESSION_LOCK_ASSERT_NOT(is); 753 break; 754 case ISCSI_BHS_OPCODE_TASK_RESPONSE: 755 iscsi_pdu_handle_task_response(response); 756 ISCSI_SESSION_UNLOCK(is); 757 break; 758 case ISCSI_BHS_OPCODE_SCSI_DATA_IN: 759 iscsi_pdu_handle_data_in(response); 760 /* Session lock dropped inside. */ 761 ISCSI_SESSION_LOCK_ASSERT_NOT(is); 762 break; 763 case ISCSI_BHS_OPCODE_LOGOUT_RESPONSE: 764 iscsi_pdu_handle_logout_response(response); 765 ISCSI_SESSION_UNLOCK(is); 766 break; 767 case ISCSI_BHS_OPCODE_R2T: 768 iscsi_pdu_handle_r2t(response); 769 ISCSI_SESSION_UNLOCK(is); 770 break; 771 case ISCSI_BHS_OPCODE_ASYNC_MESSAGE: 772 iscsi_pdu_handle_async_message(response); 773 ISCSI_SESSION_UNLOCK(is); 774 break; 775 case ISCSI_BHS_OPCODE_REJECT: 776 iscsi_pdu_handle_reject(response); 777 ISCSI_SESSION_UNLOCK(is); 778 break; 779 default: 780 ISCSI_SESSION_WARN(is, "received PDU with unsupported " 781 "opcode 0x%x; reconnecting", 782 response->ip_bhs->bhs_opcode); 783 iscsi_session_reconnect(is); 784 ISCSI_SESSION_UNLOCK(is); 785 icl_pdu_free(response); 786 } 787 } 788 789 static void 790 iscsi_error_callback(struct icl_conn *ic) 791 { 792 struct iscsi_session *is; 793 794 is = CONN_SESSION(ic); 795 796 ISCSI_SESSION_WARN(is, "connection error; reconnecting"); 797 iscsi_session_reconnect(is); 798 } 799 800 static void 801 iscsi_pdu_handle_nop_in(struct icl_pdu *response) 802 { 803 struct iscsi_session *is; 804 struct iscsi_bhs_nop_out *bhsno; 805 struct iscsi_bhs_nop_in *bhsni; 806 struct icl_pdu *request; 807 void *data = NULL; 808 size_t datasize; 809 int error; 810 811 is = PDU_SESSION(response); 812 bhsni = (struct iscsi_bhs_nop_in *)response->ip_bhs; 813 814 if (bhsni->bhsni_target_transfer_tag == 0xffffffff) { 815 /* 816 * Nothing to do; iscsi_pdu_update_statsn() already 817 * zeroed the timeout. 818 */ 819 icl_pdu_free(response); 820 return; 821 } 822 823 datasize = icl_pdu_data_segment_length(response); 824 if (datasize > 0) { 825 data = malloc(datasize, M_ISCSI, M_NOWAIT | M_ZERO); 826 if (data == NULL) { 827 ISCSI_SESSION_WARN(is, "failed to allocate memory; " 828 "reconnecting"); 829 icl_pdu_free(response); 830 iscsi_session_reconnect(is); 831 return; 832 } 833 icl_pdu_get_data(response, 0, data, datasize); 834 } 835 836 request = icl_pdu_new(response->ip_conn, M_NOWAIT); 837 if (request == NULL) { 838 ISCSI_SESSION_WARN(is, "failed to allocate memory; " 839 "reconnecting"); 840 free(data, M_ISCSI); 841 icl_pdu_free(response); 842 iscsi_session_reconnect(is); 843 return; 844 } 845 bhsno = (struct iscsi_bhs_nop_out *)request->ip_bhs; 846 bhsno->bhsno_opcode = ISCSI_BHS_OPCODE_NOP_OUT | 847 ISCSI_BHS_OPCODE_IMMEDIATE; 848 bhsno->bhsno_flags = 0x80; 849 bhsno->bhsno_initiator_task_tag = 0xffffffff; 850 bhsno->bhsno_target_transfer_tag = bhsni->bhsni_target_transfer_tag; 851 if (datasize > 0) { 852 error = icl_pdu_append_data(request, data, datasize, M_NOWAIT); 853 if (error != 0) { 854 ISCSI_SESSION_WARN(is, "failed to allocate memory; " 855 "reconnecting"); 856 free(data, M_ISCSI); 857 icl_pdu_free(request); 858 icl_pdu_free(response); 859 iscsi_session_reconnect(is); 860 return; 861 } 862 free(data, M_ISCSI); 863 } 864 865 icl_pdu_free(response); 866 iscsi_pdu_queue_locked(request); 867 } 868 869 static void 870 iscsi_pdu_handle_scsi_response(struct icl_pdu *response) 871 { 872 struct iscsi_bhs_scsi_response *bhssr; 873 struct iscsi_outstanding *io; 874 struct iscsi_session *is; 875 union ccb *ccb; 876 struct ccb_scsiio *csio; 877 size_t data_segment_len, received; 878 uint16_t sense_len; 879 uint32_t resid; 880 881 is = PDU_SESSION(response); 882 883 bhssr = (struct iscsi_bhs_scsi_response *)response->ip_bhs; 884 io = iscsi_outstanding_find(is, bhssr->bhssr_initiator_task_tag); 885 if (io == NULL || io->io_ccb == NULL) { 886 ISCSI_SESSION_WARN(is, "bad itt 0x%x", bhssr->bhssr_initiator_task_tag); 887 icl_pdu_free(response); 888 iscsi_session_reconnect(is); 889 ISCSI_SESSION_UNLOCK(is); 890 return; 891 } 892 893 ccb = io->io_ccb; 894 895 /* 896 * With iSER, after getting good response we can be sure 897 * that all the data has been successfully transferred. 898 */ 899 if (is->is_conn->ic_iser) { 900 resid = ntohl(bhssr->bhssr_residual_count); 901 if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_UNDERFLOW) { 902 io->io_received = ccb->csio.dxfer_len - resid; 903 } else if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_OVERFLOW) { 904 ISCSI_SESSION_WARN(is, "overflow: target indicates %d", resid); 905 } else { 906 io->io_received = ccb->csio.dxfer_len; 907 } 908 } 909 910 received = io->io_received; 911 iscsi_outstanding_remove(is, io); 912 ISCSI_SESSION_UNLOCK(is); 913 914 if (bhssr->bhssr_response != BHSSR_RESPONSE_COMMAND_COMPLETED) { 915 ISCSI_SESSION_WARN(is, "service response 0x%x", bhssr->bhssr_response); 916 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 917 xpt_freeze_devq(ccb->ccb_h.path, 1); 918 ISCSI_SESSION_DEBUG(is, "freezing devq"); 919 } 920 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN; 921 } else if (bhssr->bhssr_status == 0) { 922 ccb->ccb_h.status = CAM_REQ_CMP; 923 } else { 924 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 925 xpt_freeze_devq(ccb->ccb_h.path, 1); 926 ISCSI_SESSION_DEBUG(is, "freezing devq"); 927 } 928 ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR | CAM_DEV_QFRZN; 929 ccb->csio.scsi_status = bhssr->bhssr_status; 930 } 931 932 csio = &ccb->csio; 933 data_segment_len = icl_pdu_data_segment_length(response); 934 if (data_segment_len > 0) { 935 if (data_segment_len < sizeof(sense_len)) { 936 ISCSI_SESSION_WARN(is, "truncated data segment (%zd bytes)", 937 data_segment_len); 938 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 939 xpt_freeze_devq(ccb->ccb_h.path, 1); 940 ISCSI_SESSION_DEBUG(is, "freezing devq"); 941 } 942 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN; 943 goto out; 944 } 945 icl_pdu_get_data(response, 0, &sense_len, sizeof(sense_len)); 946 sense_len = ntohs(sense_len); 947 #if 0 948 ISCSI_SESSION_DEBUG(is, "sense_len %d, data len %zd", 949 sense_len, data_segment_len); 950 #endif 951 if (sizeof(sense_len) + sense_len > data_segment_len) { 952 ISCSI_SESSION_WARN(is, "truncated data segment " 953 "(%zd bytes, should be %zd)", 954 data_segment_len, sizeof(sense_len) + sense_len); 955 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 956 xpt_freeze_devq(ccb->ccb_h.path, 1); 957 ISCSI_SESSION_DEBUG(is, "freezing devq"); 958 } 959 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN; 960 goto out; 961 } else if (sizeof(sense_len) + sense_len < data_segment_len) 962 ISCSI_SESSION_WARN(is, "oversize data segment " 963 "(%zd bytes, should be %zd)", 964 data_segment_len, sizeof(sense_len) + sense_len); 965 if (sense_len > csio->sense_len) { 966 ISCSI_SESSION_DEBUG(is, "truncating sense from %d to %d", 967 sense_len, csio->sense_len); 968 sense_len = csio->sense_len; 969 } 970 icl_pdu_get_data(response, sizeof(sense_len), &csio->sense_data, sense_len); 971 csio->sense_resid = csio->sense_len - sense_len; 972 ccb->ccb_h.status |= CAM_AUTOSNS_VALID; 973 } 974 975 out: 976 if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_UNDERFLOW) 977 csio->resid = ntohl(bhssr->bhssr_residual_count); 978 979 if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) { 980 KASSERT(received <= csio->dxfer_len, 981 ("received > csio->dxfer_len")); 982 if (received < csio->dxfer_len) { 983 if (csio->resid != csio->dxfer_len - received) { 984 ISCSI_SESSION_WARN(is, "underflow mismatch: " 985 "target indicates %d, we calculated %zd", 986 csio->resid, csio->dxfer_len - received); 987 } 988 csio->resid = csio->dxfer_len - received; 989 } 990 } 991 992 xpt_done(ccb); 993 icl_pdu_free(response); 994 } 995 996 static void 997 iscsi_pdu_handle_task_response(struct icl_pdu *response) 998 { 999 struct iscsi_bhs_task_management_response *bhstmr; 1000 struct iscsi_outstanding *io, *aio; 1001 struct iscsi_session *is; 1002 1003 is = PDU_SESSION(response); 1004 1005 bhstmr = (struct iscsi_bhs_task_management_response *)response->ip_bhs; 1006 io = iscsi_outstanding_find(is, bhstmr->bhstmr_initiator_task_tag); 1007 if (io == NULL || io->io_ccb != NULL) { 1008 ISCSI_SESSION_WARN(is, "bad itt 0x%x", 1009 bhstmr->bhstmr_initiator_task_tag); 1010 icl_pdu_free(response); 1011 iscsi_session_reconnect(is); 1012 return; 1013 } 1014 1015 if (bhstmr->bhstmr_response != BHSTMR_RESPONSE_FUNCTION_COMPLETE) { 1016 ISCSI_SESSION_WARN(is, "task response 0x%x", 1017 bhstmr->bhstmr_response); 1018 } else { 1019 aio = iscsi_outstanding_find(is, io->io_datasn); 1020 if (aio != NULL && aio->io_ccb != NULL) 1021 iscsi_session_terminate_task(is, aio, CAM_REQ_ABORTED); 1022 } 1023 1024 iscsi_outstanding_remove(is, io); 1025 icl_pdu_free(response); 1026 } 1027 1028 static void 1029 iscsi_pdu_handle_data_in(struct icl_pdu *response) 1030 { 1031 struct iscsi_bhs_data_in *bhsdi; 1032 struct iscsi_outstanding *io; 1033 struct iscsi_session *is; 1034 union ccb *ccb; 1035 struct ccb_scsiio *csio; 1036 size_t data_segment_len, received, oreceived; 1037 1038 is = PDU_SESSION(response); 1039 bhsdi = (struct iscsi_bhs_data_in *)response->ip_bhs; 1040 io = iscsi_outstanding_find(is, bhsdi->bhsdi_initiator_task_tag); 1041 if (io == NULL || io->io_ccb == NULL) { 1042 ISCSI_SESSION_WARN(is, "bad itt 0x%x", bhsdi->bhsdi_initiator_task_tag); 1043 icl_pdu_free(response); 1044 iscsi_session_reconnect(is); 1045 ISCSI_SESSION_UNLOCK(is); 1046 return; 1047 } 1048 1049 data_segment_len = icl_pdu_data_segment_length(response); 1050 if (data_segment_len == 0) { 1051 /* 1052 * "The sending of 0 length data segments should be avoided, 1053 * but initiators and targets MUST be able to properly receive 1054 * 0 length data segments." 1055 */ 1056 ISCSI_SESSION_UNLOCK(is); 1057 icl_pdu_free(response); 1058 return; 1059 } 1060 1061 /* 1062 * We need to track this for security reasons - without it, malicious target 1063 * could respond to SCSI READ without sending Data-In PDUs, which would result 1064 * in read operation on the initiator side returning random kernel data. 1065 */ 1066 if (ntohl(bhsdi->bhsdi_buffer_offset) != io->io_received) { 1067 ISCSI_SESSION_WARN(is, "data out of order; expected offset %zd, got %zd", 1068 io->io_received, (size_t)ntohl(bhsdi->bhsdi_buffer_offset)); 1069 icl_pdu_free(response); 1070 iscsi_session_reconnect(is); 1071 ISCSI_SESSION_UNLOCK(is); 1072 return; 1073 } 1074 1075 ccb = io->io_ccb; 1076 csio = &ccb->csio; 1077 1078 if (io->io_received + data_segment_len > csio->dxfer_len) { 1079 ISCSI_SESSION_WARN(is, "oversize data segment (%zd bytes " 1080 "at offset %zd, buffer is %d)", 1081 data_segment_len, io->io_received, csio->dxfer_len); 1082 icl_pdu_free(response); 1083 iscsi_session_reconnect(is); 1084 ISCSI_SESSION_UNLOCK(is); 1085 return; 1086 } 1087 1088 oreceived = io->io_received; 1089 io->io_received += data_segment_len; 1090 received = io->io_received; 1091 if ((bhsdi->bhsdi_flags & BHSDI_FLAGS_S) != 0) 1092 iscsi_outstanding_remove(is, io); 1093 ISCSI_SESSION_UNLOCK(is); 1094 1095 icl_pdu_get_data(response, 0, csio->data_ptr + oreceived, data_segment_len); 1096 1097 /* 1098 * XXX: Check DataSN. 1099 * XXX: Check F. 1100 */ 1101 if ((bhsdi->bhsdi_flags & BHSDI_FLAGS_S) == 0) { 1102 /* 1103 * Nothing more to do. 1104 */ 1105 icl_pdu_free(response); 1106 return; 1107 } 1108 1109 //ISCSI_SESSION_DEBUG(is, "got S flag; status 0x%x", bhsdi->bhsdi_status); 1110 if (bhsdi->bhsdi_status == 0) { 1111 ccb->ccb_h.status = CAM_REQ_CMP; 1112 } else { 1113 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 1114 xpt_freeze_devq(ccb->ccb_h.path, 1); 1115 ISCSI_SESSION_DEBUG(is, "freezing devq"); 1116 } 1117 ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR | CAM_DEV_QFRZN; 1118 csio->scsi_status = bhsdi->bhsdi_status; 1119 } 1120 1121 if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) { 1122 KASSERT(received <= csio->dxfer_len, 1123 ("received > csio->dxfer_len")); 1124 if (received < csio->dxfer_len) { 1125 csio->resid = ntohl(bhsdi->bhsdi_residual_count); 1126 if (csio->resid != csio->dxfer_len - received) { 1127 ISCSI_SESSION_WARN(is, "underflow mismatch: " 1128 "target indicates %d, we calculated %zd", 1129 csio->resid, csio->dxfer_len - received); 1130 } 1131 csio->resid = csio->dxfer_len - received; 1132 } 1133 } 1134 1135 xpt_done(ccb); 1136 icl_pdu_free(response); 1137 } 1138 1139 static void 1140 iscsi_pdu_handle_logout_response(struct icl_pdu *response) 1141 { 1142 1143 ISCSI_SESSION_DEBUG(PDU_SESSION(response), "logout response"); 1144 icl_pdu_free(response); 1145 } 1146 1147 static void 1148 iscsi_pdu_handle_r2t(struct icl_pdu *response) 1149 { 1150 struct icl_pdu *request; 1151 struct iscsi_session *is; 1152 struct iscsi_bhs_r2t *bhsr2t; 1153 struct iscsi_bhs_data_out *bhsdo; 1154 struct iscsi_outstanding *io; 1155 struct ccb_scsiio *csio; 1156 size_t off, len, total_len; 1157 int error; 1158 1159 is = PDU_SESSION(response); 1160 1161 bhsr2t = (struct iscsi_bhs_r2t *)response->ip_bhs; 1162 io = iscsi_outstanding_find(is, bhsr2t->bhsr2t_initiator_task_tag); 1163 if (io == NULL || io->io_ccb == NULL) { 1164 ISCSI_SESSION_WARN(is, "bad itt 0x%x; reconnecting", 1165 bhsr2t->bhsr2t_initiator_task_tag); 1166 icl_pdu_free(response); 1167 iscsi_session_reconnect(is); 1168 return; 1169 } 1170 1171 csio = &io->io_ccb->csio; 1172 1173 if ((csio->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_OUT) { 1174 ISCSI_SESSION_WARN(is, "received R2T for read command; reconnecting"); 1175 icl_pdu_free(response); 1176 iscsi_session_reconnect(is); 1177 return; 1178 } 1179 1180 /* 1181 * XXX: Verify R2TSN. 1182 */ 1183 1184 io->io_datasn = 0; 1185 1186 off = ntohl(bhsr2t->bhsr2t_buffer_offset); 1187 if (off > csio->dxfer_len) { 1188 ISCSI_SESSION_WARN(is, "target requested invalid offset " 1189 "%zd, buffer is is %d; reconnecting", off, csio->dxfer_len); 1190 icl_pdu_free(response); 1191 iscsi_session_reconnect(is); 1192 return; 1193 } 1194 1195 total_len = ntohl(bhsr2t->bhsr2t_desired_data_transfer_length); 1196 if (total_len == 0 || total_len > csio->dxfer_len) { 1197 ISCSI_SESSION_WARN(is, "target requested invalid length " 1198 "%zd, buffer is %d; reconnecting", total_len, csio->dxfer_len); 1199 icl_pdu_free(response); 1200 iscsi_session_reconnect(is); 1201 return; 1202 } 1203 1204 //ISCSI_SESSION_DEBUG(is, "r2t; off %zd, len %zd", off, total_len); 1205 1206 for (;;) { 1207 len = total_len; 1208 1209 if (len > is->is_max_send_data_segment_length) 1210 len = is->is_max_send_data_segment_length; 1211 1212 if (off + len > csio->dxfer_len) { 1213 ISCSI_SESSION_WARN(is, "target requested invalid " 1214 "length/offset %zd, buffer is %d; reconnecting", 1215 off + len, csio->dxfer_len); 1216 icl_pdu_free(response); 1217 iscsi_session_reconnect(is); 1218 return; 1219 } 1220 1221 request = icl_pdu_new(response->ip_conn, M_NOWAIT); 1222 if (request == NULL) { 1223 icl_pdu_free(response); 1224 iscsi_session_reconnect(is); 1225 return; 1226 } 1227 1228 bhsdo = (struct iscsi_bhs_data_out *)request->ip_bhs; 1229 bhsdo->bhsdo_opcode = ISCSI_BHS_OPCODE_SCSI_DATA_OUT; 1230 bhsdo->bhsdo_lun = bhsr2t->bhsr2t_lun; 1231 bhsdo->bhsdo_initiator_task_tag = 1232 bhsr2t->bhsr2t_initiator_task_tag; 1233 bhsdo->bhsdo_target_transfer_tag = 1234 bhsr2t->bhsr2t_target_transfer_tag; 1235 bhsdo->bhsdo_datasn = htonl(io->io_datasn++); 1236 bhsdo->bhsdo_buffer_offset = htonl(off); 1237 error = icl_pdu_append_data(request, csio->data_ptr + off, len, 1238 M_NOWAIT); 1239 if (error != 0) { 1240 ISCSI_SESSION_WARN(is, "failed to allocate memory; " 1241 "reconnecting"); 1242 icl_pdu_free(request); 1243 icl_pdu_free(response); 1244 iscsi_session_reconnect(is); 1245 return; 1246 } 1247 1248 off += len; 1249 total_len -= len; 1250 1251 if (total_len == 0) { 1252 bhsdo->bhsdo_flags |= BHSDO_FLAGS_F; 1253 //ISCSI_SESSION_DEBUG(is, "setting F, off %zd", off); 1254 } else { 1255 //ISCSI_SESSION_DEBUG(is, "not finished, off %zd", off); 1256 } 1257 1258 iscsi_pdu_queue_locked(request); 1259 1260 if (total_len == 0) 1261 break; 1262 } 1263 1264 icl_pdu_free(response); 1265 } 1266 1267 static void 1268 iscsi_pdu_handle_async_message(struct icl_pdu *response) 1269 { 1270 struct iscsi_bhs_asynchronous_message *bhsam; 1271 struct iscsi_session *is; 1272 1273 is = PDU_SESSION(response); 1274 bhsam = (struct iscsi_bhs_asynchronous_message *)response->ip_bhs; 1275 switch (bhsam->bhsam_async_event) { 1276 case BHSAM_EVENT_TARGET_REQUESTS_LOGOUT: 1277 ISCSI_SESSION_WARN(is, "target requests logout; removing session"); 1278 iscsi_session_logout(is); 1279 iscsi_session_terminate(is); 1280 break; 1281 case BHSAM_EVENT_TARGET_TERMINATES_CONNECTION: 1282 ISCSI_SESSION_WARN(is, "target indicates it will drop drop the connection"); 1283 break; 1284 case BHSAM_EVENT_TARGET_TERMINATES_SESSION: 1285 ISCSI_SESSION_WARN(is, "target indicates it will drop drop the session"); 1286 break; 1287 default: 1288 /* 1289 * XXX: Technically, we're obligated to also handle 1290 * parameter renegotiation. 1291 */ 1292 ISCSI_SESSION_WARN(is, "ignoring AsyncEvent %d", bhsam->bhsam_async_event); 1293 break; 1294 } 1295 1296 icl_pdu_free(response); 1297 } 1298 1299 static void 1300 iscsi_pdu_handle_reject(struct icl_pdu *response) 1301 { 1302 struct iscsi_bhs_reject *bhsr; 1303 struct iscsi_session *is; 1304 1305 is = PDU_SESSION(response); 1306 bhsr = (struct iscsi_bhs_reject *)response->ip_bhs; 1307 ISCSI_SESSION_WARN(is, "received Reject PDU, reason 0x%x; protocol error?", 1308 bhsr->bhsr_reason); 1309 1310 icl_pdu_free(response); 1311 } 1312 1313 static int 1314 iscsi_ioctl_daemon_wait(struct iscsi_softc *sc, 1315 struct iscsi_daemon_request *request) 1316 { 1317 struct iscsi_session *is; 1318 struct icl_drv_limits idl; 1319 int error; 1320 1321 sx_slock(&sc->sc_lock); 1322 for (;;) { 1323 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1324 ISCSI_SESSION_LOCK(is); 1325 if (is->is_conf.isc_enable == 0 && 1326 is->is_conf.isc_discovery == 0) { 1327 ISCSI_SESSION_UNLOCK(is); 1328 continue; 1329 } 1330 if (is->is_waiting_for_iscsid) 1331 break; 1332 ISCSI_SESSION_UNLOCK(is); 1333 } 1334 1335 if (is == NULL) { 1336 /* 1337 * No session requires attention from iscsid(8); wait. 1338 */ 1339 error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock); 1340 if (error != 0) { 1341 sx_sunlock(&sc->sc_lock); 1342 return (error); 1343 } 1344 continue; 1345 } 1346 1347 is->is_waiting_for_iscsid = false; 1348 is->is_login_phase = true; 1349 is->is_reason[0] = '\0'; 1350 ISCSI_SESSION_UNLOCK(is); 1351 1352 request->idr_session_id = is->is_id; 1353 memcpy(&request->idr_isid, &is->is_isid, 1354 sizeof(request->idr_isid)); 1355 request->idr_tsih = 0; /* New or reinstated session. */ 1356 memcpy(&request->idr_conf, &is->is_conf, 1357 sizeof(request->idr_conf)); 1358 1359 error = icl_limits(is->is_conf.isc_offload, 1360 is->is_conf.isc_iser, &idl); 1361 if (error != 0) { 1362 ISCSI_SESSION_WARN(is, "icl_limits for offload \"%s\" " 1363 "failed with error %d", is->is_conf.isc_offload, 1364 error); 1365 sx_sunlock(&sc->sc_lock); 1366 return (error); 1367 } 1368 request->idr_limits.isl_max_recv_data_segment_length = 1369 idl.idl_max_recv_data_segment_length; 1370 request->idr_limits.isl_max_send_data_segment_length = 1371 idl.idl_max_send_data_segment_length; 1372 request->idr_limits.isl_max_burst_length = 1373 idl.idl_max_burst_length; 1374 request->idr_limits.isl_first_burst_length = 1375 idl.idl_first_burst_length; 1376 1377 sx_sunlock(&sc->sc_lock); 1378 return (0); 1379 } 1380 } 1381 1382 static int 1383 iscsi_ioctl_daemon_handoff(struct iscsi_softc *sc, 1384 struct iscsi_daemon_handoff *handoff) 1385 { 1386 struct iscsi_session *is; 1387 struct icl_conn *ic; 1388 int error; 1389 1390 sx_slock(&sc->sc_lock); 1391 1392 /* 1393 * Find the session to hand off socket to. 1394 */ 1395 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1396 if (is->is_id == handoff->idh_session_id) 1397 break; 1398 } 1399 if (is == NULL) { 1400 sx_sunlock(&sc->sc_lock); 1401 return (ESRCH); 1402 } 1403 ISCSI_SESSION_LOCK(is); 1404 ic = is->is_conn; 1405 if (is->is_conf.isc_discovery || is->is_terminating) { 1406 ISCSI_SESSION_UNLOCK(is); 1407 sx_sunlock(&sc->sc_lock); 1408 return (EINVAL); 1409 } 1410 if (is->is_connected) { 1411 /* 1412 * This might have happened because another iscsid(8) 1413 * instance handed off the connection in the meantime. 1414 * Just return. 1415 */ 1416 ISCSI_SESSION_WARN(is, "handoff on already connected " 1417 "session"); 1418 ISCSI_SESSION_UNLOCK(is); 1419 sx_sunlock(&sc->sc_lock); 1420 return (EBUSY); 1421 } 1422 1423 strlcpy(is->is_target_alias, handoff->idh_target_alias, 1424 sizeof(is->is_target_alias)); 1425 is->is_tsih = handoff->idh_tsih; 1426 is->is_statsn = handoff->idh_statsn; 1427 is->is_initial_r2t = handoff->idh_initial_r2t; 1428 is->is_immediate_data = handoff->idh_immediate_data; 1429 1430 is->is_max_recv_data_segment_length = 1431 handoff->idh_max_recv_data_segment_length; 1432 is->is_max_send_data_segment_length = 1433 handoff->idh_max_send_data_segment_length; 1434 is->is_max_burst_length = handoff->idh_max_burst_length; 1435 is->is_first_burst_length = handoff->idh_first_burst_length; 1436 1437 if (handoff->idh_header_digest == ISCSI_DIGEST_CRC32C) 1438 ic->ic_header_crc32c = true; 1439 else 1440 ic->ic_header_crc32c = false; 1441 if (handoff->idh_data_digest == ISCSI_DIGEST_CRC32C) 1442 ic->ic_data_crc32c = true; 1443 else 1444 ic->ic_data_crc32c = false; 1445 ic->ic_maxtags = maxtags; 1446 1447 is->is_cmdsn = 0; 1448 is->is_expcmdsn = 0; 1449 is->is_maxcmdsn = 0; 1450 is->is_waiting_for_iscsid = false; 1451 is->is_login_phase = false; 1452 is->is_timeout = 0; 1453 is->is_connected = true; 1454 is->is_reason[0] = '\0'; 1455 1456 ISCSI_SESSION_UNLOCK(is); 1457 1458 /* 1459 * If we're going through the proxy, the idh_socket will be 0, 1460 * and the ICL module can simply ignore this call. It can also 1461 * use it to determine it's no longer in the Login phase. 1462 */ 1463 error = icl_conn_handoff(ic, handoff->idh_socket); 1464 if (error != 0) { 1465 sx_sunlock(&sc->sc_lock); 1466 iscsi_session_terminate(is); 1467 return (error); 1468 } 1469 1470 sx_sunlock(&sc->sc_lock); 1471 1472 if (is->is_sim != NULL) { 1473 /* 1474 * When reconnecting, there already is SIM allocated for the session. 1475 */ 1476 KASSERT(is->is_simq_frozen, ("reconnect without frozen simq")); 1477 ISCSI_SESSION_LOCK(is); 1478 ISCSI_SESSION_DEBUG(is, "releasing"); 1479 xpt_release_simq(is->is_sim, 1); 1480 is->is_simq_frozen = false; 1481 ISCSI_SESSION_UNLOCK(is); 1482 1483 } else { 1484 ISCSI_SESSION_LOCK(is); 1485 is->is_devq = cam_simq_alloc(ic->ic_maxtags); 1486 if (is->is_devq == NULL) { 1487 ISCSI_SESSION_WARN(is, "failed to allocate simq"); 1488 iscsi_session_terminate(is); 1489 return (ENOMEM); 1490 } 1491 1492 is->is_sim = cam_sim_alloc(iscsi_action, iscsi_poll, "iscsi", 1493 is, is->is_id /* unit */, &is->is_lock, 1494 1, ic->ic_maxtags, is->is_devq); 1495 if (is->is_sim == NULL) { 1496 ISCSI_SESSION_UNLOCK(is); 1497 ISCSI_SESSION_WARN(is, "failed to allocate SIM"); 1498 cam_simq_free(is->is_devq); 1499 iscsi_session_terminate(is); 1500 return (ENOMEM); 1501 } 1502 1503 error = xpt_bus_register(is->is_sim, NULL, 0); 1504 if (error != 0) { 1505 ISCSI_SESSION_UNLOCK(is); 1506 ISCSI_SESSION_WARN(is, "failed to register bus"); 1507 iscsi_session_terminate(is); 1508 return (ENOMEM); 1509 } 1510 1511 error = xpt_create_path(&is->is_path, /*periph*/NULL, 1512 cam_sim_path(is->is_sim), CAM_TARGET_WILDCARD, 1513 CAM_LUN_WILDCARD); 1514 if (error != CAM_REQ_CMP) { 1515 ISCSI_SESSION_UNLOCK(is); 1516 ISCSI_SESSION_WARN(is, "failed to create path"); 1517 iscsi_session_terminate(is); 1518 return (ENOMEM); 1519 } 1520 ISCSI_SESSION_UNLOCK(is); 1521 } 1522 1523 return (0); 1524 } 1525 1526 static int 1527 iscsi_ioctl_daemon_fail(struct iscsi_softc *sc, 1528 struct iscsi_daemon_fail *fail) 1529 { 1530 struct iscsi_session *is; 1531 1532 sx_slock(&sc->sc_lock); 1533 1534 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1535 if (is->is_id == fail->idf_session_id) 1536 break; 1537 } 1538 if (is == NULL) { 1539 sx_sunlock(&sc->sc_lock); 1540 return (ESRCH); 1541 } 1542 ISCSI_SESSION_LOCK(is); 1543 ISCSI_SESSION_DEBUG(is, "iscsid(8) failed: %s", 1544 fail->idf_reason); 1545 strlcpy(is->is_reason, fail->idf_reason, sizeof(is->is_reason)); 1546 //is->is_waiting_for_iscsid = false; 1547 //is->is_login_phase = true; 1548 //iscsi_session_reconnect(is); 1549 ISCSI_SESSION_UNLOCK(is); 1550 sx_sunlock(&sc->sc_lock); 1551 1552 return (0); 1553 } 1554 1555 #ifdef ICL_KERNEL_PROXY 1556 static int 1557 iscsi_ioctl_daemon_connect(struct iscsi_softc *sc, 1558 struct iscsi_daemon_connect *idc) 1559 { 1560 struct iscsi_session *is; 1561 struct sockaddr *from_sa, *to_sa; 1562 int error; 1563 1564 sx_slock(&sc->sc_lock); 1565 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1566 if (is->is_id == idc->idc_session_id) 1567 break; 1568 } 1569 if (is == NULL) { 1570 sx_sunlock(&sc->sc_lock); 1571 return (ESRCH); 1572 } 1573 sx_sunlock(&sc->sc_lock); 1574 1575 if (idc->idc_from_addrlen > 0) { 1576 error = getsockaddr(&from_sa, (void *)idc->idc_from_addr, idc->idc_from_addrlen); 1577 if (error != 0) { 1578 ISCSI_SESSION_WARN(is, 1579 "getsockaddr failed with error %d", error); 1580 return (error); 1581 } 1582 } else { 1583 from_sa = NULL; 1584 } 1585 error = getsockaddr(&to_sa, (void *)idc->idc_to_addr, idc->idc_to_addrlen); 1586 if (error != 0) { 1587 ISCSI_SESSION_WARN(is, "getsockaddr failed with error %d", 1588 error); 1589 free(from_sa, M_SONAME); 1590 return (error); 1591 } 1592 1593 ISCSI_SESSION_LOCK(is); 1594 is->is_statsn = 0; 1595 is->is_cmdsn = 0; 1596 is->is_expcmdsn = 0; 1597 is->is_maxcmdsn = 0; 1598 is->is_waiting_for_iscsid = false; 1599 is->is_login_phase = true; 1600 is->is_timeout = 0; 1601 ISCSI_SESSION_UNLOCK(is); 1602 1603 error = icl_conn_connect(is->is_conn, idc->idc_domain, 1604 idc->idc_socktype, idc->idc_protocol, from_sa, to_sa); 1605 free(from_sa, M_SONAME); 1606 free(to_sa, M_SONAME); 1607 1608 /* 1609 * Digests are always disabled during login phase. 1610 */ 1611 is->is_conn->ic_header_crc32c = false; 1612 is->is_conn->ic_data_crc32c = false; 1613 1614 return (error); 1615 } 1616 1617 static int 1618 iscsi_ioctl_daemon_send(struct iscsi_softc *sc, 1619 struct iscsi_daemon_send *ids) 1620 { 1621 struct iscsi_session *is; 1622 struct icl_pdu *ip; 1623 size_t datalen; 1624 void *data; 1625 int error; 1626 1627 sx_slock(&sc->sc_lock); 1628 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1629 if (is->is_id == ids->ids_session_id) 1630 break; 1631 } 1632 if (is == NULL) { 1633 sx_sunlock(&sc->sc_lock); 1634 return (ESRCH); 1635 } 1636 sx_sunlock(&sc->sc_lock); 1637 1638 if (is->is_login_phase == false) 1639 return (EBUSY); 1640 1641 if (is->is_terminating || is->is_reconnecting) 1642 return (EIO); 1643 1644 datalen = ids->ids_data_segment_len; 1645 if (datalen > is->is_max_send_data_segment_length) 1646 return (EINVAL); 1647 if (datalen > 0) { 1648 data = malloc(datalen, M_ISCSI, M_WAITOK); 1649 error = copyin(ids->ids_data_segment, data, datalen); 1650 if (error != 0) { 1651 free(data, M_ISCSI); 1652 return (error); 1653 } 1654 } 1655 1656 ip = icl_pdu_new(is->is_conn, M_WAITOK); 1657 memcpy(ip->ip_bhs, ids->ids_bhs, sizeof(*ip->ip_bhs)); 1658 if (datalen > 0) { 1659 error = icl_pdu_append_data(ip, data, datalen, M_WAITOK); 1660 KASSERT(error == 0, ("icl_pdu_append_data(..., M_WAITOK) failed")); 1661 free(data, M_ISCSI); 1662 } 1663 iscsi_pdu_queue(ip); 1664 1665 return (0); 1666 } 1667 1668 static int 1669 iscsi_ioctl_daemon_receive(struct iscsi_softc *sc, 1670 struct iscsi_daemon_receive *idr) 1671 { 1672 struct iscsi_session *is; 1673 struct icl_pdu *ip; 1674 void *data; 1675 int error; 1676 1677 sx_slock(&sc->sc_lock); 1678 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1679 if (is->is_id == idr->idr_session_id) 1680 break; 1681 } 1682 if (is == NULL) { 1683 sx_sunlock(&sc->sc_lock); 1684 return (ESRCH); 1685 } 1686 sx_sunlock(&sc->sc_lock); 1687 1688 if (is->is_login_phase == false) 1689 return (EBUSY); 1690 1691 ISCSI_SESSION_LOCK(is); 1692 while (is->is_login_pdu == NULL && 1693 is->is_terminating == false && 1694 is->is_reconnecting == false) { 1695 error = cv_wait_sig(&is->is_login_cv, &is->is_lock); 1696 if (error != 0) { 1697 ISCSI_SESSION_UNLOCK(is); 1698 return (error); 1699 } 1700 } 1701 if (is->is_terminating || is->is_reconnecting) { 1702 ISCSI_SESSION_UNLOCK(is); 1703 return (EIO); 1704 } 1705 ip = is->is_login_pdu; 1706 is->is_login_pdu = NULL; 1707 ISCSI_SESSION_UNLOCK(is); 1708 1709 if (ip->ip_data_len > idr->idr_data_segment_len) { 1710 icl_pdu_free(ip); 1711 return (EMSGSIZE); 1712 } 1713 1714 copyout(ip->ip_bhs, idr->idr_bhs, sizeof(*ip->ip_bhs)); 1715 if (ip->ip_data_len > 0) { 1716 data = malloc(ip->ip_data_len, M_ISCSI, M_WAITOK); 1717 icl_pdu_get_data(ip, 0, data, ip->ip_data_len); 1718 copyout(data, idr->idr_data_segment, ip->ip_data_len); 1719 free(data, M_ISCSI); 1720 } 1721 1722 icl_pdu_free(ip); 1723 1724 return (0); 1725 } 1726 #endif /* ICL_KERNEL_PROXY */ 1727 1728 static void 1729 iscsi_sanitize_session_conf(struct iscsi_session_conf *isc) 1730 { 1731 /* 1732 * Just make sure all the fields are null-terminated. 1733 * 1734 * XXX: This is not particularly secure. We should 1735 * create our own conf and then copy in relevant 1736 * fields. 1737 */ 1738 isc->isc_initiator[ISCSI_NAME_LEN - 1] = '\0'; 1739 isc->isc_initiator_addr[ISCSI_ADDR_LEN - 1] = '\0'; 1740 isc->isc_initiator_alias[ISCSI_ALIAS_LEN - 1] = '\0'; 1741 isc->isc_target[ISCSI_NAME_LEN - 1] = '\0'; 1742 isc->isc_target_addr[ISCSI_ADDR_LEN - 1] = '\0'; 1743 isc->isc_user[ISCSI_NAME_LEN - 1] = '\0'; 1744 isc->isc_secret[ISCSI_SECRET_LEN - 1] = '\0'; 1745 isc->isc_mutual_user[ISCSI_NAME_LEN - 1] = '\0'; 1746 isc->isc_mutual_secret[ISCSI_SECRET_LEN - 1] = '\0'; 1747 } 1748 1749 static bool 1750 iscsi_valid_session_conf(const struct iscsi_session_conf *isc) 1751 { 1752 1753 if (isc->isc_initiator[0] == '\0') { 1754 ISCSI_DEBUG("empty isc_initiator"); 1755 return (false); 1756 } 1757 1758 if (isc->isc_target_addr[0] == '\0') { 1759 ISCSI_DEBUG("empty isc_target_addr"); 1760 return (false); 1761 } 1762 1763 if (isc->isc_discovery != 0 && isc->isc_target[0] != 0) { 1764 ISCSI_DEBUG("non-empty isc_target for discovery session"); 1765 return (false); 1766 } 1767 1768 if (isc->isc_discovery == 0 && isc->isc_target[0] == 0) { 1769 ISCSI_DEBUG("empty isc_target for non-discovery session"); 1770 return (false); 1771 } 1772 1773 return (true); 1774 } 1775 1776 static int 1777 iscsi_ioctl_session_add(struct iscsi_softc *sc, struct iscsi_session_add *isa) 1778 { 1779 struct iscsi_session *is; 1780 const struct iscsi_session *is2; 1781 int error; 1782 1783 iscsi_sanitize_session_conf(&isa->isa_conf); 1784 if (iscsi_valid_session_conf(&isa->isa_conf) == false) 1785 return (EINVAL); 1786 1787 is = malloc(sizeof(*is), M_ISCSI, M_ZERO | M_WAITOK); 1788 memcpy(&is->is_conf, &isa->isa_conf, sizeof(is->is_conf)); 1789 1790 sx_xlock(&sc->sc_lock); 1791 1792 /* 1793 * Prevent duplicates. 1794 */ 1795 TAILQ_FOREACH(is2, &sc->sc_sessions, is_next) { 1796 if (!!is->is_conf.isc_discovery != 1797 !!is2->is_conf.isc_discovery) 1798 continue; 1799 1800 if (strcmp(is->is_conf.isc_target_addr, 1801 is2->is_conf.isc_target_addr) != 0) 1802 continue; 1803 1804 if (is->is_conf.isc_discovery == 0 && 1805 strcmp(is->is_conf.isc_target, 1806 is2->is_conf.isc_target) != 0) 1807 continue; 1808 1809 sx_xunlock(&sc->sc_lock); 1810 free(is, M_ISCSI); 1811 return (EBUSY); 1812 } 1813 1814 is->is_conn = icl_new_conn(is->is_conf.isc_offload, 1815 is->is_conf.isc_iser, "iscsi", &is->is_lock); 1816 if (is->is_conn == NULL) { 1817 sx_xunlock(&sc->sc_lock); 1818 free(is, M_ISCSI); 1819 return (EINVAL); 1820 } 1821 is->is_conn->ic_receive = iscsi_receive_callback; 1822 is->is_conn->ic_error = iscsi_error_callback; 1823 is->is_conn->ic_prv0 = is; 1824 TAILQ_INIT(&is->is_outstanding); 1825 STAILQ_INIT(&is->is_postponed); 1826 mtx_init(&is->is_lock, "iscsi_lock", NULL, MTX_DEF); 1827 cv_init(&is->is_maintenance_cv, "iscsi_mt"); 1828 #ifdef ICL_KERNEL_PROXY 1829 cv_init(&is->is_login_cv, "iscsi_login"); 1830 #endif 1831 1832 is->is_softc = sc; 1833 sc->sc_last_session_id++; 1834 is->is_id = sc->sc_last_session_id; 1835 is->is_isid[0] = 0x80; /* RFC 3720, 10.12.5: 10b, "Random" ISID. */ 1836 arc4rand(&is->is_isid[1], 5, 0); 1837 is->is_tsih = 0; 1838 callout_init(&is->is_callout, 1); 1839 1840 error = kthread_add(iscsi_maintenance_thread, is, NULL, NULL, 0, 0, "iscsimt"); 1841 if (error != 0) { 1842 ISCSI_SESSION_WARN(is, "kthread_add(9) failed with error %d", error); 1843 sx_xunlock(&sc->sc_lock); 1844 return (error); 1845 } 1846 1847 callout_reset(&is->is_callout, 1 * hz, iscsi_callout, is); 1848 TAILQ_INSERT_TAIL(&sc->sc_sessions, is, is_next); 1849 1850 ISCSI_SESSION_LOCK(is); 1851 /* 1852 * Don't notify iscsid(8) if the session is disabled and it's not 1853 * a discovery session, 1854 */ 1855 if (is->is_conf.isc_enable == 0 && is->is_conf.isc_discovery == 0) { 1856 ISCSI_SESSION_UNLOCK(is); 1857 sx_xunlock(&sc->sc_lock); 1858 return (0); 1859 } 1860 1861 is->is_waiting_for_iscsid = true; 1862 strlcpy(is->is_reason, "Waiting for iscsid(8)", sizeof(is->is_reason)); 1863 ISCSI_SESSION_UNLOCK(is); 1864 cv_signal(&sc->sc_cv); 1865 sx_xunlock(&sc->sc_lock); 1866 return (0); 1867 } 1868 1869 static bool 1870 iscsi_session_conf_matches(unsigned int id1, const struct iscsi_session_conf *c1, 1871 unsigned int id2, const struct iscsi_session_conf *c2) 1872 { 1873 1874 if (id2 != 0 && id2 != id1) 1875 return (false); 1876 if (c2->isc_target[0] != '\0' && 1877 strcmp(c1->isc_target, c2->isc_target) != 0) 1878 return (false); 1879 if (c2->isc_target_addr[0] != '\0' && 1880 strcmp(c1->isc_target_addr, c2->isc_target_addr) != 0) 1881 return (false); 1882 return (true); 1883 } 1884 1885 static int 1886 iscsi_ioctl_session_remove(struct iscsi_softc *sc, 1887 struct iscsi_session_remove *isr) 1888 { 1889 struct iscsi_session *is, *tmp; 1890 bool found = false; 1891 1892 iscsi_sanitize_session_conf(&isr->isr_conf); 1893 1894 sx_xlock(&sc->sc_lock); 1895 TAILQ_FOREACH_SAFE(is, &sc->sc_sessions, is_next, tmp) { 1896 ISCSI_SESSION_LOCK(is); 1897 if (iscsi_session_conf_matches(is->is_id, &is->is_conf, 1898 isr->isr_session_id, &isr->isr_conf)) { 1899 found = true; 1900 iscsi_session_logout(is); 1901 iscsi_session_terminate(is); 1902 } 1903 ISCSI_SESSION_UNLOCK(is); 1904 } 1905 sx_xunlock(&sc->sc_lock); 1906 1907 if (!found) 1908 return (ESRCH); 1909 1910 return (0); 1911 } 1912 1913 static int 1914 iscsi_ioctl_session_list(struct iscsi_softc *sc, struct iscsi_session_list *isl) 1915 { 1916 int error; 1917 unsigned int i = 0; 1918 struct iscsi_session *is; 1919 struct iscsi_session_state iss; 1920 1921 sx_slock(&sc->sc_lock); 1922 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1923 if (i >= isl->isl_nentries) { 1924 sx_sunlock(&sc->sc_lock); 1925 return (EMSGSIZE); 1926 } 1927 memset(&iss, 0, sizeof(iss)); 1928 memcpy(&iss.iss_conf, &is->is_conf, sizeof(iss.iss_conf)); 1929 iss.iss_id = is->is_id; 1930 strlcpy(iss.iss_target_alias, is->is_target_alias, sizeof(iss.iss_target_alias)); 1931 strlcpy(iss.iss_reason, is->is_reason, sizeof(iss.iss_reason)); 1932 strlcpy(iss.iss_offload, is->is_conn->ic_offload, sizeof(iss.iss_offload)); 1933 1934 if (is->is_conn->ic_header_crc32c) 1935 iss.iss_header_digest = ISCSI_DIGEST_CRC32C; 1936 else 1937 iss.iss_header_digest = ISCSI_DIGEST_NONE; 1938 1939 if (is->is_conn->ic_data_crc32c) 1940 iss.iss_data_digest = ISCSI_DIGEST_CRC32C; 1941 else 1942 iss.iss_data_digest = ISCSI_DIGEST_NONE; 1943 1944 iss.iss_max_send_data_segment_length = 1945 is->is_max_send_data_segment_length; 1946 iss.iss_max_recv_data_segment_length = 1947 is->is_max_recv_data_segment_length; 1948 iss.iss_max_burst_length = is->is_max_burst_length; 1949 iss.iss_first_burst_length = is->is_first_burst_length; 1950 iss.iss_immediate_data = is->is_immediate_data; 1951 iss.iss_connected = is->is_connected; 1952 1953 error = copyout(&iss, isl->isl_pstates + i, sizeof(iss)); 1954 if (error != 0) { 1955 sx_sunlock(&sc->sc_lock); 1956 return (error); 1957 } 1958 i++; 1959 } 1960 sx_sunlock(&sc->sc_lock); 1961 1962 isl->isl_nentries = i; 1963 1964 return (0); 1965 } 1966 1967 static int 1968 iscsi_ioctl_session_modify(struct iscsi_softc *sc, 1969 struct iscsi_session_modify *ism) 1970 { 1971 struct iscsi_session *is; 1972 1973 iscsi_sanitize_session_conf(&ism->ism_conf); 1974 if (iscsi_valid_session_conf(&ism->ism_conf) == false) 1975 return (EINVAL); 1976 1977 sx_xlock(&sc->sc_lock); 1978 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1979 ISCSI_SESSION_LOCK(is); 1980 if (is->is_id == ism->ism_session_id) 1981 break; 1982 ISCSI_SESSION_UNLOCK(is); 1983 } 1984 if (is == NULL) { 1985 sx_xunlock(&sc->sc_lock); 1986 return (ESRCH); 1987 } 1988 sx_xunlock(&sc->sc_lock); 1989 1990 memcpy(&is->is_conf, &ism->ism_conf, sizeof(is->is_conf)); 1991 ISCSI_SESSION_UNLOCK(is); 1992 1993 iscsi_session_reconnect(is); 1994 1995 return (0); 1996 } 1997 1998 static int 1999 iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, int mode, 2000 struct thread *td) 2001 { 2002 struct iscsi_softc *sc; 2003 2004 sc = dev->si_drv1; 2005 2006 switch (cmd) { 2007 case ISCSIDWAIT: 2008 return (iscsi_ioctl_daemon_wait(sc, 2009 (struct iscsi_daemon_request *)arg)); 2010 case ISCSIDHANDOFF: 2011 return (iscsi_ioctl_daemon_handoff(sc, 2012 (struct iscsi_daemon_handoff *)arg)); 2013 case ISCSIDFAIL: 2014 return (iscsi_ioctl_daemon_fail(sc, 2015 (struct iscsi_daemon_fail *)arg)); 2016 #ifdef ICL_KERNEL_PROXY 2017 case ISCSIDCONNECT: 2018 return (iscsi_ioctl_daemon_connect(sc, 2019 (struct iscsi_daemon_connect *)arg)); 2020 case ISCSIDSEND: 2021 return (iscsi_ioctl_daemon_send(sc, 2022 (struct iscsi_daemon_send *)arg)); 2023 case ISCSIDRECEIVE: 2024 return (iscsi_ioctl_daemon_receive(sc, 2025 (struct iscsi_daemon_receive *)arg)); 2026 #endif /* ICL_KERNEL_PROXY */ 2027 case ISCSISADD: 2028 return (iscsi_ioctl_session_add(sc, 2029 (struct iscsi_session_add *)arg)); 2030 case ISCSISREMOVE: 2031 return (iscsi_ioctl_session_remove(sc, 2032 (struct iscsi_session_remove *)arg)); 2033 case ISCSISLIST: 2034 return (iscsi_ioctl_session_list(sc, 2035 (struct iscsi_session_list *)arg)); 2036 case ISCSISMODIFY: 2037 return (iscsi_ioctl_session_modify(sc, 2038 (struct iscsi_session_modify *)arg)); 2039 default: 2040 return (EINVAL); 2041 } 2042 } 2043 2044 static struct iscsi_outstanding * 2045 iscsi_outstanding_find(struct iscsi_session *is, uint32_t initiator_task_tag) 2046 { 2047 struct iscsi_outstanding *io; 2048 2049 ISCSI_SESSION_LOCK_ASSERT(is); 2050 2051 TAILQ_FOREACH(io, &is->is_outstanding, io_next) { 2052 if (io->io_initiator_task_tag == initiator_task_tag) 2053 return (io); 2054 } 2055 return (NULL); 2056 } 2057 2058 static struct iscsi_outstanding * 2059 iscsi_outstanding_find_ccb(struct iscsi_session *is, union ccb *ccb) 2060 { 2061 struct iscsi_outstanding *io; 2062 2063 ISCSI_SESSION_LOCK_ASSERT(is); 2064 2065 TAILQ_FOREACH(io, &is->is_outstanding, io_next) { 2066 if (io->io_ccb == ccb) 2067 return (io); 2068 } 2069 return (NULL); 2070 } 2071 2072 static struct iscsi_outstanding * 2073 iscsi_outstanding_add(struct iscsi_session *is, struct icl_pdu *request, 2074 union ccb *ccb, uint32_t *initiator_task_tagp) 2075 { 2076 struct iscsi_outstanding *io; 2077 int error; 2078 2079 ISCSI_SESSION_LOCK_ASSERT(is); 2080 2081 io = uma_zalloc(iscsi_outstanding_zone, M_NOWAIT | M_ZERO); 2082 if (io == NULL) { 2083 ISCSI_SESSION_WARN(is, "failed to allocate %zd bytes", 2084 sizeof(*io)); 2085 return (NULL); 2086 } 2087 2088 error = icl_conn_task_setup(is->is_conn, request, &ccb->csio, 2089 initiator_task_tagp, &io->io_icl_prv); 2090 if (error != 0) { 2091 ISCSI_SESSION_WARN(is, 2092 "icl_conn_task_setup() failed with error %d", error); 2093 uma_zfree(iscsi_outstanding_zone, io); 2094 return (NULL); 2095 } 2096 2097 KASSERT(iscsi_outstanding_find(is, *initiator_task_tagp) == NULL, 2098 ("initiator_task_tag 0x%x already added", *initiator_task_tagp)); 2099 2100 io->io_initiator_task_tag = *initiator_task_tagp; 2101 io->io_ccb = ccb; 2102 TAILQ_INSERT_TAIL(&is->is_outstanding, io, io_next); 2103 return (io); 2104 } 2105 2106 static void 2107 iscsi_outstanding_remove(struct iscsi_session *is, struct iscsi_outstanding *io) 2108 { 2109 2110 ISCSI_SESSION_LOCK_ASSERT(is); 2111 2112 icl_conn_task_done(is->is_conn, io->io_icl_prv); 2113 TAILQ_REMOVE(&is->is_outstanding, io, io_next); 2114 uma_zfree(iscsi_outstanding_zone, io); 2115 } 2116 2117 static void 2118 iscsi_action_abort(struct iscsi_session *is, union ccb *ccb) 2119 { 2120 struct icl_pdu *request; 2121 struct iscsi_bhs_task_management_request *bhstmr; 2122 struct ccb_abort *cab = &ccb->cab; 2123 struct iscsi_outstanding *io, *aio; 2124 uint32_t initiator_task_tag; 2125 2126 ISCSI_SESSION_LOCK_ASSERT(is); 2127 2128 #if 0 2129 KASSERT(is->is_login_phase == false, ("%s called during Login Phase", __func__)); 2130 #else 2131 if (is->is_login_phase) { 2132 ccb->ccb_h.status = CAM_REQ_ABORTED; 2133 xpt_done(ccb); 2134 return; 2135 } 2136 #endif 2137 2138 aio = iscsi_outstanding_find_ccb(is, cab->abort_ccb); 2139 if (aio == NULL) { 2140 ccb->ccb_h.status = CAM_REQ_CMP; 2141 xpt_done(ccb); 2142 return; 2143 } 2144 2145 request = icl_pdu_new(is->is_conn, M_NOWAIT); 2146 if (request == NULL) { 2147 ccb->ccb_h.status = CAM_RESRC_UNAVAIL; 2148 xpt_done(ccb); 2149 return; 2150 } 2151 2152 initiator_task_tag = is->is_initiator_task_tag++; 2153 2154 io = iscsi_outstanding_add(is, request, NULL, &initiator_task_tag); 2155 if (io == NULL) { 2156 icl_pdu_free(request); 2157 ccb->ccb_h.status = CAM_RESRC_UNAVAIL; 2158 xpt_done(ccb); 2159 return; 2160 } 2161 io->io_datasn = aio->io_initiator_task_tag; 2162 2163 bhstmr = (struct iscsi_bhs_task_management_request *)request->ip_bhs; 2164 bhstmr->bhstmr_opcode = ISCSI_BHS_OPCODE_TASK_REQUEST; 2165 bhstmr->bhstmr_function = 0x80 | BHSTMR_FUNCTION_ABORT_TASK; 2166 bhstmr->bhstmr_lun = htobe64(CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun)); 2167 bhstmr->bhstmr_initiator_task_tag = initiator_task_tag; 2168 bhstmr->bhstmr_referenced_task_tag = aio->io_initiator_task_tag; 2169 2170 iscsi_pdu_queue_locked(request); 2171 } 2172 2173 static void 2174 iscsi_action_scsiio(struct iscsi_session *is, union ccb *ccb) 2175 { 2176 struct icl_pdu *request; 2177 struct iscsi_bhs_scsi_command *bhssc; 2178 struct ccb_scsiio *csio; 2179 struct iscsi_outstanding *io; 2180 size_t len; 2181 uint32_t initiator_task_tag; 2182 int error; 2183 2184 ISCSI_SESSION_LOCK_ASSERT(is); 2185 2186 #if 0 2187 KASSERT(is->is_login_phase == false, ("%s called during Login Phase", __func__)); 2188 #else 2189 if (is->is_login_phase) { 2190 ISCSI_SESSION_DEBUG(is, "called during login phase"); 2191 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 2192 xpt_freeze_devq(ccb->ccb_h.path, 1); 2193 ISCSI_SESSION_DEBUG(is, "freezing devq"); 2194 } 2195 ccb->ccb_h.status = CAM_REQ_ABORTED | CAM_DEV_QFRZN; 2196 xpt_done(ccb); 2197 return; 2198 } 2199 #endif 2200 2201 request = icl_pdu_new(is->is_conn, M_NOWAIT); 2202 if (request == NULL) { 2203 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 2204 xpt_freeze_devq(ccb->ccb_h.path, 1); 2205 ISCSI_SESSION_DEBUG(is, "freezing devq"); 2206 } 2207 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN; 2208 xpt_done(ccb); 2209 return; 2210 } 2211 2212 initiator_task_tag = is->is_initiator_task_tag++; 2213 io = iscsi_outstanding_add(is, request, ccb, &initiator_task_tag); 2214 if (io == NULL) { 2215 icl_pdu_free(request); 2216 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 2217 xpt_freeze_devq(ccb->ccb_h.path, 1); 2218 ISCSI_SESSION_DEBUG(is, "freezing devq"); 2219 } 2220 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN; 2221 xpt_done(ccb); 2222 return; 2223 } 2224 2225 csio = &ccb->csio; 2226 bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs; 2227 bhssc->bhssc_opcode = ISCSI_BHS_OPCODE_SCSI_COMMAND; 2228 bhssc->bhssc_flags |= BHSSC_FLAGS_F; 2229 switch (csio->ccb_h.flags & CAM_DIR_MASK) { 2230 case CAM_DIR_IN: 2231 bhssc->bhssc_flags |= BHSSC_FLAGS_R; 2232 break; 2233 case CAM_DIR_OUT: 2234 bhssc->bhssc_flags |= BHSSC_FLAGS_W; 2235 break; 2236 } 2237 2238 if ((ccb->ccb_h.flags & CAM_TAG_ACTION_VALID) != 0) { 2239 switch (csio->tag_action) { 2240 case MSG_HEAD_OF_Q_TAG: 2241 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_HOQ; 2242 break; 2243 case MSG_ORDERED_Q_TAG: 2244 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_ORDERED; 2245 break; 2246 case MSG_ACA_TASK: 2247 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_ACA; 2248 break; 2249 case MSG_SIMPLE_Q_TAG: 2250 default: 2251 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_SIMPLE; 2252 break; 2253 } 2254 } else 2255 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_UNTAGGED; 2256 2257 bhssc->bhssc_lun = htobe64(CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun)); 2258 bhssc->bhssc_initiator_task_tag = initiator_task_tag; 2259 bhssc->bhssc_expected_data_transfer_length = htonl(csio->dxfer_len); 2260 KASSERT(csio->cdb_len <= sizeof(bhssc->bhssc_cdb), 2261 ("unsupported CDB size %zd", (size_t)csio->cdb_len)); 2262 2263 if (csio->ccb_h.flags & CAM_CDB_POINTER) 2264 memcpy(&bhssc->bhssc_cdb, csio->cdb_io.cdb_ptr, csio->cdb_len); 2265 else 2266 memcpy(&bhssc->bhssc_cdb, csio->cdb_io.cdb_bytes, csio->cdb_len); 2267 2268 if (is->is_immediate_data && 2269 (csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT) { 2270 len = csio->dxfer_len; 2271 //ISCSI_SESSION_DEBUG(is, "adding %zd of immediate data", len); 2272 if (len > is->is_first_burst_length) { 2273 ISCSI_SESSION_DEBUG(is, "len %zd -> %d", len, is->is_first_burst_length); 2274 len = is->is_first_burst_length; 2275 } 2276 if (len > is->is_max_send_data_segment_length) { 2277 ISCSI_SESSION_DEBUG(is, "len %zd -> %d", len, 2278 is->is_max_send_data_segment_length); 2279 len = is->is_max_send_data_segment_length; 2280 } 2281 2282 error = icl_pdu_append_data(request, csio->data_ptr, len, M_NOWAIT); 2283 if (error != 0) { 2284 iscsi_outstanding_remove(is, io); 2285 icl_pdu_free(request); 2286 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 2287 xpt_freeze_devq(ccb->ccb_h.path, 1); 2288 ISCSI_SESSION_DEBUG(is, "freezing devq"); 2289 } 2290 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN; 2291 xpt_done(ccb); 2292 return; 2293 } 2294 } 2295 iscsi_pdu_queue_locked(request); 2296 } 2297 2298 static void 2299 iscsi_action(struct cam_sim *sim, union ccb *ccb) 2300 { 2301 struct iscsi_session *is; 2302 2303 is = cam_sim_softc(sim); 2304 2305 ISCSI_SESSION_LOCK_ASSERT(is); 2306 2307 if (is->is_terminating || 2308 (is->is_connected == false && fail_on_disconnection)) { 2309 ccb->ccb_h.status = CAM_DEV_NOT_THERE; 2310 xpt_done(ccb); 2311 return; 2312 } 2313 2314 switch (ccb->ccb_h.func_code) { 2315 case XPT_PATH_INQ: 2316 { 2317 struct ccb_pathinq *cpi = &ccb->cpi; 2318 2319 cpi->version_num = 1; 2320 cpi->hba_inquiry = PI_TAG_ABLE; 2321 cpi->target_sprt = 0; 2322 cpi->hba_misc = PIM_EXTLUNS; 2323 /* 2324 * XXX: It shouldn't ever be NULL; this could be turned 2325 * into a KASSERT eventually. 2326 */ 2327 if (is->is_conn == NULL) 2328 ISCSI_WARN("NULL conn"); 2329 else if (is->is_conn->ic_unmapped) 2330 cpi->hba_misc |= PIM_UNMAPPED; 2331 cpi->hba_eng_cnt = 0; 2332 cpi->max_target = 0; 2333 /* 2334 * Note that the variable below is only relevant for targets 2335 * that don't claim compliance with anything above SPC2, which 2336 * means they don't support REPORT_LUNS. 2337 */ 2338 cpi->max_lun = 255; 2339 cpi->initiator_id = ~0; 2340 strlcpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN); 2341 strlcpy(cpi->hba_vid, "iSCSI", HBA_IDLEN); 2342 strlcpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN); 2343 cpi->unit_number = cam_sim_unit(sim); 2344 cpi->bus_id = cam_sim_bus(sim); 2345 cpi->base_transfer_speed = 150000; /* XXX */ 2346 cpi->transport = XPORT_ISCSI; 2347 cpi->transport_version = 0; 2348 cpi->protocol = PROTO_SCSI; 2349 cpi->protocol_version = SCSI_REV_SPC3; 2350 cpi->maxio = MAXPHYS; 2351 cpi->ccb_h.status = CAM_REQ_CMP; 2352 break; 2353 } 2354 case XPT_GET_TRAN_SETTINGS: 2355 { 2356 struct ccb_trans_settings *cts; 2357 struct ccb_trans_settings_scsi *scsi; 2358 2359 cts = &ccb->cts; 2360 scsi = &cts->proto_specific.scsi; 2361 2362 cts->protocol = PROTO_SCSI; 2363 cts->protocol_version = SCSI_REV_SPC3; 2364 cts->transport = XPORT_ISCSI; 2365 cts->transport_version = 0; 2366 scsi->valid = CTS_SCSI_VALID_TQ; 2367 scsi->flags = CTS_SCSI_FLAGS_TAG_ENB; 2368 cts->ccb_h.status = CAM_REQ_CMP; 2369 break; 2370 } 2371 case XPT_CALC_GEOMETRY: 2372 cam_calc_geometry(&ccb->ccg, /*extended*/1); 2373 ccb->ccb_h.status = CAM_REQ_CMP; 2374 break; 2375 #if 0 2376 /* 2377 * XXX: What's the point? 2378 */ 2379 case XPT_RESET_BUS: 2380 case XPT_TERM_IO: 2381 ISCSI_SESSION_DEBUG(is, "faking success for reset, abort, or term_io"); 2382 ccb->ccb_h.status = CAM_REQ_CMP; 2383 break; 2384 #endif 2385 case XPT_ABORT: 2386 iscsi_action_abort(is, ccb); 2387 return; 2388 case XPT_SCSI_IO: 2389 iscsi_action_scsiio(is, ccb); 2390 return; 2391 default: 2392 #if 0 2393 ISCSI_SESSION_DEBUG(is, "got unsupported code 0x%x", ccb->ccb_h.func_code); 2394 #endif 2395 ccb->ccb_h.status = CAM_FUNC_NOTAVAIL; 2396 break; 2397 } 2398 xpt_done(ccb); 2399 } 2400 2401 static void 2402 iscsi_poll(struct cam_sim *sim) 2403 { 2404 2405 KASSERT(0, ("%s: you're not supposed to be here", __func__)); 2406 } 2407 2408 static void 2409 iscsi_terminate_sessions(struct iscsi_softc *sc) 2410 { 2411 struct iscsi_session *is; 2412 2413 sx_slock(&sc->sc_lock); 2414 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) 2415 iscsi_session_terminate(is); 2416 while(!TAILQ_EMPTY(&sc->sc_sessions)) { 2417 ISCSI_DEBUG("waiting for sessions to terminate"); 2418 cv_wait(&sc->sc_cv, &sc->sc_lock); 2419 } 2420 ISCSI_DEBUG("all sessions terminated"); 2421 sx_sunlock(&sc->sc_lock); 2422 } 2423 2424 static void 2425 iscsi_shutdown_pre(struct iscsi_softc *sc) 2426 { 2427 struct iscsi_session *is; 2428 2429 if (!fail_on_shutdown) 2430 return; 2431 2432 /* 2433 * If we have any sessions waiting for reconnection, request 2434 * maintenance thread to fail them immediately instead of waiting 2435 * for reconnect timeout. 2436 * 2437 * This prevents LUNs with mounted filesystems that are supported 2438 * by disconnected iSCSI sessions from hanging, however it will 2439 * fail all queued BIOs. 2440 */ 2441 ISCSI_DEBUG("forcing failing all disconnected sessions due to shutdown"); 2442 2443 fail_on_disconnection = 1; 2444 2445 sx_slock(&sc->sc_lock); 2446 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 2447 ISCSI_SESSION_LOCK(is); 2448 if (!is->is_connected) { 2449 ISCSI_SESSION_DEBUG(is, "force failing disconnected session early"); 2450 iscsi_session_reconnect(is); 2451 } 2452 ISCSI_SESSION_UNLOCK(is); 2453 } 2454 sx_sunlock(&sc->sc_lock); 2455 } 2456 2457 static void 2458 iscsi_shutdown_post(struct iscsi_softc *sc) 2459 { 2460 2461 if (panicstr == NULL) { 2462 ISCSI_DEBUG("removing all sessions due to shutdown"); 2463 iscsi_terminate_sessions(sc); 2464 } 2465 } 2466 2467 static int 2468 iscsi_load(void) 2469 { 2470 int error; 2471 2472 sc = malloc(sizeof(*sc), M_ISCSI, M_ZERO | M_WAITOK); 2473 sx_init(&sc->sc_lock, "iscsi"); 2474 TAILQ_INIT(&sc->sc_sessions); 2475 cv_init(&sc->sc_cv, "iscsi_cv"); 2476 2477 iscsi_outstanding_zone = uma_zcreate("iscsi_outstanding", 2478 sizeof(struct iscsi_outstanding), NULL, NULL, NULL, NULL, 2479 UMA_ALIGN_PTR, 0); 2480 2481 error = make_dev_p(MAKEDEV_CHECKNAME, &sc->sc_cdev, &iscsi_cdevsw, 2482 NULL, UID_ROOT, GID_WHEEL, 0600, "iscsi"); 2483 if (error != 0) { 2484 ISCSI_WARN("failed to create device node, error %d", error); 2485 return (error); 2486 } 2487 sc->sc_cdev->si_drv1 = sc; 2488 2489 sc->sc_shutdown_pre_eh = EVENTHANDLER_REGISTER(shutdown_pre_sync, 2490 iscsi_shutdown_pre, sc, SHUTDOWN_PRI_FIRST); 2491 /* 2492 * shutdown_post_sync needs to run after filesystem shutdown and before 2493 * CAM shutdown - otherwise when rebooting with an iSCSI session that is 2494 * disconnected but has outstanding requests, dashutdown() will hang on 2495 * cam_periph_runccb(). 2496 */ 2497 sc->sc_shutdown_post_eh = EVENTHANDLER_REGISTER(shutdown_post_sync, 2498 iscsi_shutdown_post, sc, SHUTDOWN_PRI_DEFAULT - 1); 2499 2500 return (0); 2501 } 2502 2503 static int 2504 iscsi_unload(void) 2505 { 2506 2507 if (sc->sc_cdev != NULL) { 2508 ISCSI_DEBUG("removing device node"); 2509 destroy_dev(sc->sc_cdev); 2510 ISCSI_DEBUG("device node removed"); 2511 } 2512 2513 if (sc->sc_shutdown_pre_eh != NULL) 2514 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, sc->sc_shutdown_pre_eh); 2515 if (sc->sc_shutdown_post_eh != NULL) 2516 EVENTHANDLER_DEREGISTER(shutdown_post_sync, sc->sc_shutdown_post_eh); 2517 2518 iscsi_terminate_sessions(sc); 2519 2520 uma_zdestroy(iscsi_outstanding_zone); 2521 sx_destroy(&sc->sc_lock); 2522 cv_destroy(&sc->sc_cv); 2523 free(sc, M_ISCSI); 2524 return (0); 2525 } 2526 2527 static int 2528 iscsi_quiesce(void) 2529 { 2530 sx_slock(&sc->sc_lock); 2531 if (!TAILQ_EMPTY(&sc->sc_sessions)) { 2532 sx_sunlock(&sc->sc_lock); 2533 return (EBUSY); 2534 } 2535 sx_sunlock(&sc->sc_lock); 2536 return (0); 2537 } 2538 2539 static int 2540 iscsi_modevent(module_t mod, int what, void *arg) 2541 { 2542 int error; 2543 2544 switch (what) { 2545 case MOD_LOAD: 2546 error = iscsi_load(); 2547 break; 2548 case MOD_UNLOAD: 2549 error = iscsi_unload(); 2550 break; 2551 case MOD_QUIESCE: 2552 error = iscsi_quiesce(); 2553 break; 2554 default: 2555 error = EINVAL; 2556 break; 2557 } 2558 return (error); 2559 } 2560 2561 moduledata_t iscsi_data = { 2562 "iscsi", 2563 iscsi_modevent, 2564 0 2565 }; 2566 2567 DECLARE_MODULE(iscsi, iscsi_data, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 2568 MODULE_DEPEND(iscsi, cam, 1, 1, 1); 2569 MODULE_DEPEND(iscsi, icl, 1, 1, 1); 2570