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