1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2012 The FreeBSD Foundation 5 * All rights reserved. 6 * 7 * This software was developed by Edward Tomasz Napierala under sponsorship 8 * from the FreeBSD Foundation. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/param.h> 37 #include <sys/condvar.h> 38 #include <sys/conf.h> 39 #include <sys/endian.h> 40 #include <sys/eventhandler.h> 41 #include <sys/file.h> 42 #include <sys/kernel.h> 43 #include <sys/kthread.h> 44 #include <sys/lock.h> 45 #include <sys/malloc.h> 46 #include <sys/mutex.h> 47 #include <sys/module.h> 48 #include <sys/socket.h> 49 #include <sys/sysctl.h> 50 #include <sys/systm.h> 51 #include <sys/sx.h> 52 #include <vm/uma.h> 53 54 #include <cam/cam.h> 55 #include <cam/cam_ccb.h> 56 #include <cam/cam_xpt.h> 57 #include <cam/cam_debug.h> 58 #include <cam/cam_sim.h> 59 #include <cam/cam_xpt_sim.h> 60 #include <cam/cam_xpt_periph.h> 61 #include <cam/cam_periph.h> 62 #include <cam/scsi/scsi_all.h> 63 #include <cam/scsi/scsi_message.h> 64 65 #include <dev/iscsi/icl.h> 66 #include <dev/iscsi/icl_wrappers.h> 67 #include <dev/iscsi/iscsi_ioctl.h> 68 #include <dev/iscsi/iscsi_proto.h> 69 #include <dev/iscsi/iscsi.h> 70 71 #ifdef ICL_KERNEL_PROXY 72 #include <sys/socketvar.h> 73 #endif 74 75 #ifdef ICL_KERNEL_PROXY 76 FEATURE(iscsi_kernel_proxy, "iSCSI initiator built with ICL_KERNEL_PROXY"); 77 #endif 78 79 /* 80 * XXX: This is global so the iscsi_unload() can access it. 81 * Think about how to do this properly. 82 */ 83 static struct iscsi_softc *sc; 84 85 SYSCTL_NODE(_kern, OID_AUTO, iscsi, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 86 "iSCSI initiator"); 87 static int debug = 1; 88 SYSCTL_INT(_kern_iscsi, OID_AUTO, debug, CTLFLAG_RWTUN, 89 &debug, 0, "Enable debug messages"); 90 static int ping_timeout = 5; 91 SYSCTL_INT(_kern_iscsi, OID_AUTO, ping_timeout, CTLFLAG_RWTUN, &ping_timeout, 92 0, "Timeout for ping (NOP-Out) requests, in seconds"); 93 static int iscsid_timeout = 60; 94 SYSCTL_INT(_kern_iscsi, OID_AUTO, iscsid_timeout, CTLFLAG_RWTUN, &iscsid_timeout, 95 0, "Time to wait for iscsid(8) to handle reconnection, in seconds"); 96 static int login_timeout = 60; 97 SYSCTL_INT(_kern_iscsi, OID_AUTO, login_timeout, CTLFLAG_RWTUN, &login_timeout, 98 0, "Time to wait for iscsid(8) to finish Login Phase, in seconds"); 99 static int maxtags = 255; 100 SYSCTL_INT(_kern_iscsi, OID_AUTO, maxtags, CTLFLAG_RWTUN, &maxtags, 101 0, "Max number of IO requests queued"); 102 static int fail_on_disconnection = 0; 103 SYSCTL_INT(_kern_iscsi, OID_AUTO, fail_on_disconnection, CTLFLAG_RWTUN, 104 &fail_on_disconnection, 0, "Destroy CAM SIM on connection failure"); 105 static int fail_on_shutdown = 1; 106 SYSCTL_INT(_kern_iscsi, OID_AUTO, fail_on_shutdown, CTLFLAG_RWTUN, 107 &fail_on_shutdown, 0, "Fail disconnected sessions on shutdown"); 108 109 static MALLOC_DEFINE(M_ISCSI, "iSCSI", "iSCSI initiator"); 110 static uma_zone_t iscsi_outstanding_zone; 111 112 #define CONN_SESSION(X) ((struct iscsi_session *)X->ic_prv0) 113 #define PDU_SESSION(X) (CONN_SESSION(X->ip_conn)) 114 115 #define ISCSI_DEBUG(X, ...) \ 116 do { \ 117 if (debug > 1) \ 118 printf("%s: " X "\n", __func__, ## __VA_ARGS__);\ 119 } while (0) 120 121 #define ISCSI_WARN(X, ...) \ 122 do { \ 123 if (debug > 0) { \ 124 printf("WARNING: %s: " X "\n", \ 125 __func__, ## __VA_ARGS__); \ 126 } \ 127 } while (0) 128 129 #define ISCSI_SESSION_DEBUG(S, X, ...) \ 130 do { \ 131 if (debug > 1) { \ 132 printf("%s: %s (%s): " X "\n", \ 133 __func__, S->is_conf.isc_target_addr, \ 134 S->is_conf.isc_target, ## __VA_ARGS__); \ 135 } \ 136 } while (0) 137 138 #define ISCSI_SESSION_WARN(S, X, ...) \ 139 do { \ 140 if (debug > 0) { \ 141 printf("WARNING: %s (%s): " X "\n", \ 142 S->is_conf.isc_target_addr, \ 143 S->is_conf.isc_target, ## __VA_ARGS__); \ 144 } \ 145 } while (0) 146 147 #define ISCSI_SESSION_LOCK(X) mtx_lock(&X->is_lock) 148 #define ISCSI_SESSION_UNLOCK(X) mtx_unlock(&X->is_lock) 149 #define ISCSI_SESSION_LOCK_ASSERT(X) mtx_assert(&X->is_lock, MA_OWNED) 150 #define ISCSI_SESSION_LOCK_ASSERT_NOT(X) mtx_assert(&X->is_lock, MA_NOTOWNED) 151 152 static int iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, 153 int mode, struct thread *td); 154 155 static struct cdevsw iscsi_cdevsw = { 156 .d_version = D_VERSION, 157 .d_ioctl = iscsi_ioctl, 158 .d_name = "iscsi", 159 }; 160 161 static void iscsi_pdu_queue_locked(struct icl_pdu *request); 162 static void iscsi_pdu_queue(struct icl_pdu *request); 163 static void iscsi_pdu_update_statsn(const struct icl_pdu *response); 164 static void iscsi_pdu_handle_nop_in(struct icl_pdu *response); 165 static void iscsi_pdu_handle_scsi_response(struct icl_pdu *response); 166 static void iscsi_pdu_handle_task_response(struct icl_pdu *response); 167 static void iscsi_pdu_handle_data_in(struct icl_pdu *response); 168 static void iscsi_pdu_handle_logout_response(struct icl_pdu *response); 169 static void iscsi_pdu_handle_r2t(struct icl_pdu *response); 170 static void iscsi_pdu_handle_async_message(struct icl_pdu *response); 171 static void iscsi_pdu_handle_reject(struct icl_pdu *response); 172 static void iscsi_session_reconnect(struct iscsi_session *is); 173 static void iscsi_session_terminate(struct iscsi_session *is); 174 static void iscsi_action(struct cam_sim *sim, union ccb *ccb); 175 static void iscsi_poll(struct cam_sim *sim); 176 static struct iscsi_outstanding *iscsi_outstanding_find(struct iscsi_session *is, 177 uint32_t initiator_task_tag); 178 static struct iscsi_outstanding *iscsi_outstanding_add(struct iscsi_session *is, 179 struct icl_pdu *request, union ccb *ccb, 180 uint32_t *initiator_task_tagp); 181 static void iscsi_outstanding_remove(struct iscsi_session *is, 182 struct iscsi_outstanding *io); 183 184 static bool 185 iscsi_pdu_prepare(struct icl_pdu *request) 186 { 187 struct iscsi_session *is; 188 struct iscsi_bhs_scsi_command *bhssc; 189 190 is = PDU_SESSION(request); 191 192 ISCSI_SESSION_LOCK_ASSERT(is); 193 194 /* 195 * We're only using fields common for all the request 196 * (initiator -> target) PDUs. 197 */ 198 bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs; 199 200 /* 201 * Data-Out PDU does not contain CmdSN. 202 */ 203 if (bhssc->bhssc_opcode != ISCSI_BHS_OPCODE_SCSI_DATA_OUT) { 204 if (ISCSI_SNGT(is->is_cmdsn, is->is_maxcmdsn) && 205 (bhssc->bhssc_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0) { 206 /* 207 * Current MaxCmdSN prevents us from sending any more 208 * SCSI Command PDUs to the target; postpone the PDU. 209 * It will get resent by either iscsi_pdu_queue(), 210 * or by maintenance thread. 211 */ 212 #if 0 213 ISCSI_SESSION_DEBUG(is, "postponing send, CmdSN %u, " 214 "ExpCmdSN %u, MaxCmdSN %u, opcode 0x%x", 215 is->is_cmdsn, is->is_expcmdsn, is->is_maxcmdsn, 216 bhssc->bhssc_opcode); 217 #endif 218 return (true); 219 } 220 bhssc->bhssc_cmdsn = htonl(is->is_cmdsn); 221 if ((bhssc->bhssc_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0) 222 is->is_cmdsn++; 223 } 224 bhssc->bhssc_expstatsn = htonl(is->is_statsn + 1); 225 226 return (false); 227 } 228 229 static void 230 iscsi_session_send_postponed(struct iscsi_session *is) 231 { 232 struct icl_pdu *request; 233 bool postpone; 234 235 ISCSI_SESSION_LOCK_ASSERT(is); 236 237 if (STAILQ_EMPTY(&is->is_postponed)) 238 return; 239 while ((request = STAILQ_FIRST(&is->is_postponed)) != NULL) { 240 postpone = iscsi_pdu_prepare(request); 241 if (postpone) 242 return; 243 STAILQ_REMOVE_HEAD(&is->is_postponed, ip_next); 244 icl_pdu_queue(request); 245 } 246 xpt_release_simq(is->is_sim, 1); 247 } 248 249 static void 250 iscsi_pdu_queue_locked(struct icl_pdu *request) 251 { 252 struct iscsi_session *is; 253 bool postpone; 254 255 is = PDU_SESSION(request); 256 ISCSI_SESSION_LOCK_ASSERT(is); 257 iscsi_session_send_postponed(is); 258 postpone = iscsi_pdu_prepare(request); 259 if (postpone) { 260 if (STAILQ_EMPTY(&is->is_postponed)) 261 xpt_freeze_simq(is->is_sim, 1); 262 STAILQ_INSERT_TAIL(&is->is_postponed, request, ip_next); 263 return; 264 } 265 icl_pdu_queue(request); 266 } 267 268 static void 269 iscsi_pdu_queue(struct icl_pdu *request) 270 { 271 struct iscsi_session *is; 272 273 is = PDU_SESSION(request); 274 ISCSI_SESSION_LOCK(is); 275 iscsi_pdu_queue_locked(request); 276 ISCSI_SESSION_UNLOCK(is); 277 } 278 279 static void 280 iscsi_session_logout(struct iscsi_session *is) 281 { 282 struct icl_pdu *request; 283 struct iscsi_bhs_logout_request *bhslr; 284 285 request = icl_pdu_new(is->is_conn, M_NOWAIT); 286 if (request == NULL) 287 return; 288 289 bhslr = (struct iscsi_bhs_logout_request *)request->ip_bhs; 290 bhslr->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_REQUEST; 291 bhslr->bhslr_reason = BHSLR_REASON_CLOSE_SESSION; 292 iscsi_pdu_queue_locked(request); 293 } 294 295 static void 296 iscsi_session_terminate_task(struct iscsi_session *is, 297 struct iscsi_outstanding *io, cam_status status) 298 { 299 300 ISCSI_SESSION_LOCK_ASSERT(is); 301 302 if (io->io_ccb != NULL) { 303 io->io_ccb->ccb_h.status &= ~(CAM_SIM_QUEUED | CAM_STATUS_MASK); 304 io->io_ccb->ccb_h.status |= status; 305 if ((io->io_ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 306 io->io_ccb->ccb_h.status |= CAM_DEV_QFRZN; 307 xpt_freeze_devq(io->io_ccb->ccb_h.path, 1); 308 ISCSI_SESSION_DEBUG(is, "freezing devq"); 309 } 310 xpt_done(io->io_ccb); 311 } 312 iscsi_outstanding_remove(is, io); 313 } 314 315 static void 316 iscsi_session_terminate_tasks(struct iscsi_session *is, cam_status status) 317 { 318 struct iscsi_outstanding *io, *tmp; 319 320 ISCSI_SESSION_LOCK_ASSERT(is); 321 322 TAILQ_FOREACH_SAFE(io, &is->is_outstanding, io_next, tmp) { 323 iscsi_session_terminate_task(is, io, status); 324 } 325 } 326 327 static void 328 iscsi_session_cleanup(struct iscsi_session *is, bool destroy_sim) 329 { 330 struct icl_pdu *pdu; 331 332 ISCSI_SESSION_LOCK_ASSERT(is); 333 334 /* 335 * Don't queue any new PDUs. 336 */ 337 if (is->is_sim != NULL && is->is_simq_frozen == false) { 338 ISCSI_SESSION_DEBUG(is, "freezing"); 339 xpt_freeze_simq(is->is_sim, 1); 340 is->is_simq_frozen = true; 341 } 342 343 /* 344 * Remove postponed PDUs. 345 */ 346 if (!STAILQ_EMPTY(&is->is_postponed)) 347 xpt_release_simq(is->is_sim, 1); 348 while ((pdu = STAILQ_FIRST(&is->is_postponed)) != NULL) { 349 STAILQ_REMOVE_HEAD(&is->is_postponed, ip_next); 350 icl_pdu_free(pdu); 351 } 352 353 if (destroy_sim == false) { 354 /* 355 * Terminate SCSI tasks, asking CAM to requeue them. 356 */ 357 iscsi_session_terminate_tasks(is, CAM_REQUEUE_REQ); 358 return; 359 } 360 361 iscsi_session_terminate_tasks(is, CAM_DEV_NOT_THERE); 362 363 if (is->is_sim == NULL) 364 return; 365 366 ISCSI_SESSION_DEBUG(is, "deregistering SIM"); 367 xpt_async(AC_LOST_DEVICE, is->is_path, NULL); 368 369 if (is->is_simq_frozen) { 370 xpt_release_simq(is->is_sim, 1); 371 is->is_simq_frozen = false; 372 } 373 374 xpt_free_path(is->is_path); 375 is->is_path = NULL; 376 xpt_bus_deregister(cam_sim_path(is->is_sim)); 377 cam_sim_free(is->is_sim, TRUE /*free_devq*/); 378 is->is_sim = NULL; 379 is->is_devq = NULL; 380 } 381 382 static void 383 iscsi_maintenance_thread_reconnect(struct iscsi_session *is) 384 { 385 386 icl_conn_close(is->is_conn); 387 388 ISCSI_SESSION_LOCK(is); 389 390 is->is_connected = false; 391 is->is_reconnecting = false; 392 is->is_login_phase = false; 393 394 #ifdef ICL_KERNEL_PROXY 395 if (is->is_login_pdu != NULL) { 396 icl_pdu_free(is->is_login_pdu); 397 is->is_login_pdu = NULL; 398 } 399 cv_signal(&is->is_login_cv); 400 #endif 401 402 if (fail_on_disconnection) { 403 ISCSI_SESSION_DEBUG(is, "connection failed, destroying devices"); 404 iscsi_session_cleanup(is, true); 405 } else { 406 iscsi_session_cleanup(is, false); 407 } 408 409 KASSERT(TAILQ_EMPTY(&is->is_outstanding), 410 ("destroying session with active tasks")); 411 KASSERT(STAILQ_EMPTY(&is->is_postponed), 412 ("destroying session with postponed PDUs")); 413 414 if (is->is_conf.isc_enable == 0 && is->is_conf.isc_discovery == 0) { 415 ISCSI_SESSION_UNLOCK(is); 416 return; 417 } 418 419 /* 420 * Request immediate reconnection from iscsid(8). 421 */ 422 //ISCSI_SESSION_DEBUG(is, "waking up iscsid(8)"); 423 is->is_waiting_for_iscsid = true; 424 strlcpy(is->is_reason, "Waiting for iscsid(8)", sizeof(is->is_reason)); 425 is->is_timeout = 0; 426 ISCSI_SESSION_UNLOCK(is); 427 cv_signal(&is->is_softc->sc_cv); 428 } 429 430 static void 431 iscsi_maintenance_thread_terminate(struct iscsi_session *is) 432 { 433 struct iscsi_softc *sc; 434 435 sc = is->is_softc; 436 sx_xlock(&sc->sc_lock); 437 TAILQ_REMOVE(&sc->sc_sessions, is, is_next); 438 sx_xunlock(&sc->sc_lock); 439 440 icl_conn_close(is->is_conn); 441 callout_drain(&is->is_callout); 442 443 ISCSI_SESSION_LOCK(is); 444 445 KASSERT(is->is_terminating, ("is_terminating == false")); 446 447 #ifdef ICL_KERNEL_PROXY 448 if (is->is_login_pdu != NULL) { 449 icl_pdu_free(is->is_login_pdu); 450 is->is_login_pdu = NULL; 451 } 452 cv_signal(&is->is_login_cv); 453 #endif 454 455 iscsi_session_cleanup(is, true); 456 457 KASSERT(TAILQ_EMPTY(&is->is_outstanding), 458 ("destroying session with active tasks")); 459 KASSERT(STAILQ_EMPTY(&is->is_postponed), 460 ("destroying session with postponed PDUs")); 461 462 ISCSI_SESSION_UNLOCK(is); 463 464 icl_conn_free(is->is_conn); 465 mtx_destroy(&is->is_lock); 466 cv_destroy(&is->is_maintenance_cv); 467 #ifdef ICL_KERNEL_PROXY 468 cv_destroy(&is->is_login_cv); 469 #endif 470 471 ISCSI_SESSION_DEBUG(is, "terminated"); 472 free(is, M_ISCSI); 473 474 /* 475 * The iscsi_unload() routine might be waiting. 476 */ 477 cv_signal(&sc->sc_cv); 478 } 479 480 static void 481 iscsi_maintenance_thread(void *arg) 482 { 483 struct iscsi_session *is = arg; 484 485 ISCSI_SESSION_LOCK(is); 486 for (;;) { 487 if (is->is_reconnecting == false && 488 is->is_terminating == false && 489 (STAILQ_EMPTY(&is->is_postponed) || 490 ISCSI_SNGT(is->is_cmdsn, is->is_maxcmdsn))) 491 cv_wait(&is->is_maintenance_cv, &is->is_lock); 492 493 /* Terminate supersedes reconnect. */ 494 if (is->is_terminating) { 495 ISCSI_SESSION_UNLOCK(is); 496 iscsi_maintenance_thread_terminate(is); 497 kthread_exit(); 498 return; 499 } 500 501 if (is->is_reconnecting) { 502 ISCSI_SESSION_UNLOCK(is); 503 iscsi_maintenance_thread_reconnect(is); 504 ISCSI_SESSION_LOCK(is); 505 continue; 506 } 507 508 iscsi_session_send_postponed(is); 509 } 510 ISCSI_SESSION_UNLOCK(is); 511 } 512 513 static void 514 iscsi_session_reconnect(struct iscsi_session *is) 515 { 516 517 /* 518 * XXX: We can't use locking here, because 519 * it's being called from various contexts. 520 * Hope it doesn't break anything. 521 */ 522 if (is->is_reconnecting) 523 return; 524 525 is->is_reconnecting = true; 526 cv_signal(&is->is_maintenance_cv); 527 } 528 529 static void 530 iscsi_session_terminate(struct iscsi_session *is) 531 { 532 533 if (is->is_terminating) 534 return; 535 536 is->is_terminating = true; 537 538 #if 0 539 iscsi_session_logout(is); 540 #endif 541 cv_signal(&is->is_maintenance_cv); 542 } 543 544 static void 545 iscsi_callout(void *context) 546 { 547 struct icl_pdu *request; 548 struct iscsi_bhs_nop_out *bhsno; 549 struct iscsi_session *is; 550 bool reconnect_needed = false; 551 552 is = context; 553 554 ISCSI_SESSION_LOCK(is); 555 if (is->is_terminating) { 556 ISCSI_SESSION_UNLOCK(is); 557 return; 558 } 559 560 callout_schedule(&is->is_callout, 1 * hz); 561 562 if (is->is_conf.isc_enable == 0) 563 goto out; 564 565 is->is_timeout++; 566 567 if (is->is_waiting_for_iscsid) { 568 if (iscsid_timeout > 0 && is->is_timeout > iscsid_timeout) { 569 ISCSI_SESSION_WARN(is, "timed out waiting for iscsid(8) " 570 "for %d seconds; reconnecting", 571 is->is_timeout); 572 reconnect_needed = true; 573 } 574 goto out; 575 } 576 577 if (is->is_login_phase) { 578 if (login_timeout > 0 && is->is_timeout > login_timeout) { 579 ISCSI_SESSION_WARN(is, "login timed out after %d seconds; " 580 "reconnecting", is->is_timeout); 581 reconnect_needed = true; 582 } 583 goto out; 584 } 585 586 if (ping_timeout <= 0) { 587 /* 588 * Pings are disabled. Don't send NOP-Out in this case. 589 * Reset the timeout, to avoid triggering reconnection, 590 * should the user decide to reenable them. 591 */ 592 is->is_timeout = 0; 593 goto out; 594 } 595 596 if (is->is_timeout >= ping_timeout) { 597 ISCSI_SESSION_WARN(is, "no ping reply (NOP-In) after %d seconds; " 598 "reconnecting", ping_timeout); 599 reconnect_needed = true; 600 goto out; 601 } 602 603 ISCSI_SESSION_UNLOCK(is); 604 605 /* 606 * If the ping was reset less than one second ago - which means 607 * that we've received some PDU during the last second - assume 608 * the traffic flows correctly and don't bother sending a NOP-Out. 609 * 610 * (It's 2 - one for one second, and one for incrementing is_timeout 611 * earlier in this routine.) 612 */ 613 if (is->is_timeout < 2) 614 return; 615 616 request = icl_pdu_new(is->is_conn, M_NOWAIT); 617 if (request == NULL) { 618 ISCSI_SESSION_WARN(is, "failed to allocate PDU"); 619 return; 620 } 621 bhsno = (struct iscsi_bhs_nop_out *)request->ip_bhs; 622 bhsno->bhsno_opcode = ISCSI_BHS_OPCODE_NOP_OUT | 623 ISCSI_BHS_OPCODE_IMMEDIATE; 624 bhsno->bhsno_flags = 0x80; 625 bhsno->bhsno_target_transfer_tag = 0xffffffff; 626 iscsi_pdu_queue(request); 627 return; 628 629 out: 630 if (is->is_terminating) { 631 ISCSI_SESSION_UNLOCK(is); 632 return; 633 } 634 635 ISCSI_SESSION_UNLOCK(is); 636 637 if (reconnect_needed) 638 iscsi_session_reconnect(is); 639 } 640 641 static void 642 iscsi_pdu_update_statsn(const struct icl_pdu *response) 643 { 644 const struct iscsi_bhs_data_in *bhsdi; 645 struct iscsi_session *is; 646 uint32_t expcmdsn, maxcmdsn, statsn; 647 648 is = PDU_SESSION(response); 649 650 ISCSI_SESSION_LOCK_ASSERT(is); 651 652 /* 653 * We're only using fields common for all the response 654 * (target -> initiator) PDUs. 655 */ 656 bhsdi = (const struct iscsi_bhs_data_in *)response->ip_bhs; 657 /* 658 * Ok, I lied. In case of Data-In, "The fields StatSN, Status, 659 * and Residual Count only have meaningful content if the S bit 660 * is set to 1", so we also need to check the bit specific for 661 * Data-In PDU. 662 */ 663 if (bhsdi->bhsdi_opcode != ISCSI_BHS_OPCODE_SCSI_DATA_IN || 664 (bhsdi->bhsdi_flags & BHSDI_FLAGS_S) != 0) { 665 statsn = ntohl(bhsdi->bhsdi_statsn); 666 if (statsn != is->is_statsn && statsn != (is->is_statsn + 1)) { 667 /* XXX: This is normal situation for MCS */ 668 ISCSI_SESSION_WARN(is, "PDU 0x%x StatSN %u != " 669 "session ExpStatSN %u (or + 1); reconnecting", 670 bhsdi->bhsdi_opcode, statsn, is->is_statsn); 671 iscsi_session_reconnect(is); 672 } 673 if (ISCSI_SNGT(statsn, is->is_statsn)) 674 is->is_statsn = statsn; 675 } 676 677 expcmdsn = ntohl(bhsdi->bhsdi_expcmdsn); 678 maxcmdsn = ntohl(bhsdi->bhsdi_maxcmdsn); 679 680 if (ISCSI_SNLT(maxcmdsn + 1, expcmdsn)) { 681 ISCSI_SESSION_DEBUG(is, 682 "PDU MaxCmdSN %u + 1 < PDU ExpCmdSN %u; ignoring", 683 maxcmdsn, expcmdsn); 684 } else { 685 if (ISCSI_SNGT(maxcmdsn, is->is_maxcmdsn)) { 686 is->is_maxcmdsn = maxcmdsn; 687 688 /* 689 * Command window increased; kick the maintanance thread 690 * to send out postponed commands. 691 */ 692 if (!STAILQ_EMPTY(&is->is_postponed)) 693 cv_signal(&is->is_maintenance_cv); 694 } else if (ISCSI_SNLT(maxcmdsn, is->is_maxcmdsn)) { 695 /* XXX: This is normal situation for MCS */ 696 ISCSI_SESSION_DEBUG(is, 697 "PDU MaxCmdSN %u < session MaxCmdSN %u; ignoring", 698 maxcmdsn, is->is_maxcmdsn); 699 } 700 701 if (ISCSI_SNGT(expcmdsn, is->is_expcmdsn)) { 702 is->is_expcmdsn = expcmdsn; 703 } else if (ISCSI_SNLT(expcmdsn, is->is_expcmdsn)) { 704 /* XXX: This is normal situation for MCS */ 705 ISCSI_SESSION_DEBUG(is, 706 "PDU ExpCmdSN %u < session ExpCmdSN %u; ignoring", 707 expcmdsn, is->is_expcmdsn); 708 } 709 } 710 711 /* 712 * Every incoming PDU - not just NOP-In - resets the ping timer. 713 * The purpose of the timeout is to reset the connection when it stalls; 714 * we don't want this to happen when NOP-In or NOP-Out ends up delayed 715 * in some queue. 716 */ 717 is->is_timeout = 0; 718 } 719 720 static void 721 iscsi_receive_callback(struct icl_pdu *response) 722 { 723 struct iscsi_session *is; 724 725 is = PDU_SESSION(response); 726 727 ISCSI_SESSION_LOCK(is); 728 729 iscsi_pdu_update_statsn(response); 730 731 #ifdef ICL_KERNEL_PROXY 732 if (is->is_login_phase) { 733 if (is->is_login_pdu == NULL) 734 is->is_login_pdu = response; 735 else 736 icl_pdu_free(response); 737 ISCSI_SESSION_UNLOCK(is); 738 cv_signal(&is->is_login_cv); 739 return; 740 } 741 #endif 742 743 /* 744 * The handling routine is responsible for freeing the PDU 745 * when it's no longer needed. 746 */ 747 switch (response->ip_bhs->bhs_opcode) { 748 case ISCSI_BHS_OPCODE_NOP_IN: 749 iscsi_pdu_handle_nop_in(response); 750 ISCSI_SESSION_UNLOCK(is); 751 break; 752 case ISCSI_BHS_OPCODE_SCSI_RESPONSE: 753 iscsi_pdu_handle_scsi_response(response); 754 /* Session lock dropped inside. */ 755 ISCSI_SESSION_LOCK_ASSERT_NOT(is); 756 break; 757 case ISCSI_BHS_OPCODE_TASK_RESPONSE: 758 iscsi_pdu_handle_task_response(response); 759 ISCSI_SESSION_UNLOCK(is); 760 break; 761 case ISCSI_BHS_OPCODE_SCSI_DATA_IN: 762 iscsi_pdu_handle_data_in(response); 763 /* Session lock dropped inside. */ 764 ISCSI_SESSION_LOCK_ASSERT_NOT(is); 765 break; 766 case ISCSI_BHS_OPCODE_LOGOUT_RESPONSE: 767 iscsi_pdu_handle_logout_response(response); 768 ISCSI_SESSION_UNLOCK(is); 769 break; 770 case ISCSI_BHS_OPCODE_R2T: 771 iscsi_pdu_handle_r2t(response); 772 ISCSI_SESSION_UNLOCK(is); 773 break; 774 case ISCSI_BHS_OPCODE_ASYNC_MESSAGE: 775 iscsi_pdu_handle_async_message(response); 776 ISCSI_SESSION_UNLOCK(is); 777 break; 778 case ISCSI_BHS_OPCODE_REJECT: 779 iscsi_pdu_handle_reject(response); 780 ISCSI_SESSION_UNLOCK(is); 781 break; 782 default: 783 ISCSI_SESSION_WARN(is, "received PDU with unsupported " 784 "opcode 0x%x; reconnecting", 785 response->ip_bhs->bhs_opcode); 786 iscsi_session_reconnect(is); 787 ISCSI_SESSION_UNLOCK(is); 788 icl_pdu_free(response); 789 } 790 } 791 792 static void 793 iscsi_error_callback(struct icl_conn *ic) 794 { 795 struct iscsi_session *is; 796 797 is = CONN_SESSION(ic); 798 799 ISCSI_SESSION_WARN(is, "connection error; reconnecting"); 800 iscsi_session_reconnect(is); 801 } 802 803 static void 804 iscsi_pdu_handle_nop_in(struct icl_pdu *response) 805 { 806 struct iscsi_session *is; 807 struct iscsi_bhs_nop_out *bhsno; 808 struct iscsi_bhs_nop_in *bhsni; 809 struct icl_pdu *request; 810 void *data = NULL; 811 size_t datasize; 812 int error; 813 814 is = PDU_SESSION(response); 815 bhsni = (struct iscsi_bhs_nop_in *)response->ip_bhs; 816 817 if (bhsni->bhsni_target_transfer_tag == 0xffffffff) { 818 /* 819 * Nothing to do; iscsi_pdu_update_statsn() already 820 * zeroed the timeout. 821 */ 822 icl_pdu_free(response); 823 return; 824 } 825 826 datasize = icl_pdu_data_segment_length(response); 827 if (datasize > 0) { 828 data = malloc(datasize, M_ISCSI, M_NOWAIT | M_ZERO); 829 if (data == NULL) { 830 ISCSI_SESSION_WARN(is, "failed to allocate memory; " 831 "reconnecting"); 832 icl_pdu_free(response); 833 iscsi_session_reconnect(is); 834 return; 835 } 836 icl_pdu_get_data(response, 0, data, datasize); 837 } 838 839 request = icl_pdu_new(response->ip_conn, M_NOWAIT); 840 if (request == NULL) { 841 ISCSI_SESSION_WARN(is, "failed to allocate memory; " 842 "reconnecting"); 843 free(data, M_ISCSI); 844 icl_pdu_free(response); 845 iscsi_session_reconnect(is); 846 return; 847 } 848 bhsno = (struct iscsi_bhs_nop_out *)request->ip_bhs; 849 bhsno->bhsno_opcode = ISCSI_BHS_OPCODE_NOP_OUT | 850 ISCSI_BHS_OPCODE_IMMEDIATE; 851 bhsno->bhsno_flags = 0x80; 852 bhsno->bhsno_initiator_task_tag = 0xffffffff; 853 bhsno->bhsno_target_transfer_tag = bhsni->bhsni_target_transfer_tag; 854 if (datasize > 0) { 855 error = icl_pdu_append_data(request, data, datasize, M_NOWAIT); 856 if (error != 0) { 857 ISCSI_SESSION_WARN(is, "failed to allocate memory; " 858 "reconnecting"); 859 free(data, M_ISCSI); 860 icl_pdu_free(request); 861 icl_pdu_free(response); 862 iscsi_session_reconnect(is); 863 return; 864 } 865 free(data, M_ISCSI); 866 } 867 868 icl_pdu_free(response); 869 iscsi_pdu_queue_locked(request); 870 } 871 872 static void 873 iscsi_pdu_handle_scsi_response(struct icl_pdu *response) 874 { 875 struct iscsi_bhs_scsi_response *bhssr; 876 struct iscsi_outstanding *io; 877 struct iscsi_session *is; 878 union ccb *ccb; 879 struct ccb_scsiio *csio; 880 size_t data_segment_len, received; 881 uint16_t sense_len; 882 uint32_t resid; 883 884 is = PDU_SESSION(response); 885 886 bhssr = (struct iscsi_bhs_scsi_response *)response->ip_bhs; 887 io = iscsi_outstanding_find(is, bhssr->bhssr_initiator_task_tag); 888 if (io == NULL || io->io_ccb == NULL) { 889 ISCSI_SESSION_WARN(is, "bad itt 0x%x", bhssr->bhssr_initiator_task_tag); 890 icl_pdu_free(response); 891 iscsi_session_reconnect(is); 892 ISCSI_SESSION_UNLOCK(is); 893 return; 894 } 895 896 ccb = io->io_ccb; 897 898 /* 899 * With iSER, after getting good response we can be sure 900 * that all the data has been successfully transferred. 901 */ 902 if (is->is_conn->ic_iser) { 903 resid = ntohl(bhssr->bhssr_residual_count); 904 if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_UNDERFLOW) { 905 io->io_received = ccb->csio.dxfer_len - resid; 906 } else if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_OVERFLOW) { 907 ISCSI_SESSION_WARN(is, "overflow: target indicates %d", resid); 908 } else { 909 io->io_received = ccb->csio.dxfer_len; 910 } 911 } 912 913 received = io->io_received; 914 iscsi_outstanding_remove(is, io); 915 ISCSI_SESSION_UNLOCK(is); 916 917 if (bhssr->bhssr_response != BHSSR_RESPONSE_COMMAND_COMPLETED) { 918 ISCSI_SESSION_WARN(is, "service response 0x%x", bhssr->bhssr_response); 919 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 920 xpt_freeze_devq(ccb->ccb_h.path, 1); 921 ISCSI_SESSION_DEBUG(is, "freezing devq"); 922 } 923 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN; 924 } else if (bhssr->bhssr_status == 0) { 925 ccb->ccb_h.status = CAM_REQ_CMP; 926 } else { 927 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 928 xpt_freeze_devq(ccb->ccb_h.path, 1); 929 ISCSI_SESSION_DEBUG(is, "freezing devq"); 930 } 931 ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR | CAM_DEV_QFRZN; 932 ccb->csio.scsi_status = bhssr->bhssr_status; 933 } 934 935 csio = &ccb->csio; 936 data_segment_len = icl_pdu_data_segment_length(response); 937 if (data_segment_len > 0) { 938 if (data_segment_len < sizeof(sense_len)) { 939 ISCSI_SESSION_WARN(is, "truncated data segment (%zd bytes)", 940 data_segment_len); 941 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 942 xpt_freeze_devq(ccb->ccb_h.path, 1); 943 ISCSI_SESSION_DEBUG(is, "freezing devq"); 944 } 945 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN; 946 goto out; 947 } 948 icl_pdu_get_data(response, 0, &sense_len, sizeof(sense_len)); 949 sense_len = ntohs(sense_len); 950 #if 0 951 ISCSI_SESSION_DEBUG(is, "sense_len %d, data len %zd", 952 sense_len, data_segment_len); 953 #endif 954 if (sizeof(sense_len) + sense_len > data_segment_len) { 955 ISCSI_SESSION_WARN(is, "truncated data segment " 956 "(%zd bytes, should be %zd)", 957 data_segment_len, sizeof(sense_len) + sense_len); 958 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 959 xpt_freeze_devq(ccb->ccb_h.path, 1); 960 ISCSI_SESSION_DEBUG(is, "freezing devq"); 961 } 962 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN; 963 goto out; 964 } else if (sizeof(sense_len) + sense_len < data_segment_len) 965 ISCSI_SESSION_WARN(is, "oversize data segment " 966 "(%zd bytes, should be %zd)", 967 data_segment_len, sizeof(sense_len) + sense_len); 968 if (sense_len > csio->sense_len) { 969 ISCSI_SESSION_DEBUG(is, "truncating sense from %d to %d", 970 sense_len, csio->sense_len); 971 sense_len = csio->sense_len; 972 } 973 icl_pdu_get_data(response, sizeof(sense_len), &csio->sense_data, sense_len); 974 csio->sense_resid = csio->sense_len - sense_len; 975 ccb->ccb_h.status |= CAM_AUTOSNS_VALID; 976 } 977 978 out: 979 if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_UNDERFLOW) 980 csio->resid = ntohl(bhssr->bhssr_residual_count); 981 982 if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) { 983 KASSERT(received <= csio->dxfer_len, 984 ("received > csio->dxfer_len")); 985 if (received < csio->dxfer_len) { 986 if (csio->resid != csio->dxfer_len - received) { 987 ISCSI_SESSION_WARN(is, "underflow mismatch: " 988 "target indicates %d, we calculated %zd", 989 csio->resid, csio->dxfer_len - received); 990 } 991 csio->resid = csio->dxfer_len - received; 992 } 993 } 994 995 xpt_done(ccb); 996 icl_pdu_free(response); 997 } 998 999 static void 1000 iscsi_pdu_handle_task_response(struct icl_pdu *response) 1001 { 1002 struct iscsi_bhs_task_management_response *bhstmr; 1003 struct iscsi_outstanding *io, *aio; 1004 struct iscsi_session *is; 1005 1006 is = PDU_SESSION(response); 1007 1008 bhstmr = (struct iscsi_bhs_task_management_response *)response->ip_bhs; 1009 io = iscsi_outstanding_find(is, bhstmr->bhstmr_initiator_task_tag); 1010 if (io == NULL || io->io_ccb != NULL) { 1011 ISCSI_SESSION_WARN(is, "bad itt 0x%x", 1012 bhstmr->bhstmr_initiator_task_tag); 1013 icl_pdu_free(response); 1014 iscsi_session_reconnect(is); 1015 return; 1016 } 1017 1018 if (bhstmr->bhstmr_response != BHSTMR_RESPONSE_FUNCTION_COMPLETE) { 1019 ISCSI_SESSION_WARN(is, "task response 0x%x", 1020 bhstmr->bhstmr_response); 1021 } else { 1022 aio = iscsi_outstanding_find(is, io->io_datasn); 1023 if (aio != NULL && aio->io_ccb != NULL) 1024 iscsi_session_terminate_task(is, aio, CAM_REQ_ABORTED); 1025 } 1026 1027 iscsi_outstanding_remove(is, io); 1028 icl_pdu_free(response); 1029 } 1030 1031 static void 1032 iscsi_pdu_handle_data_in(struct icl_pdu *response) 1033 { 1034 struct iscsi_bhs_data_in *bhsdi; 1035 struct iscsi_outstanding *io; 1036 struct iscsi_session *is; 1037 union ccb *ccb; 1038 struct ccb_scsiio *csio; 1039 size_t data_segment_len, received, oreceived; 1040 1041 is = PDU_SESSION(response); 1042 bhsdi = (struct iscsi_bhs_data_in *)response->ip_bhs; 1043 io = iscsi_outstanding_find(is, bhsdi->bhsdi_initiator_task_tag); 1044 if (io == NULL || io->io_ccb == NULL) { 1045 ISCSI_SESSION_WARN(is, "bad itt 0x%x", bhsdi->bhsdi_initiator_task_tag); 1046 icl_pdu_free(response); 1047 iscsi_session_reconnect(is); 1048 ISCSI_SESSION_UNLOCK(is); 1049 return; 1050 } 1051 1052 data_segment_len = icl_pdu_data_segment_length(response); 1053 if (data_segment_len == 0) { 1054 /* 1055 * "The sending of 0 length data segments should be avoided, 1056 * but initiators and targets MUST be able to properly receive 1057 * 0 length data segments." 1058 */ 1059 ISCSI_SESSION_UNLOCK(is); 1060 icl_pdu_free(response); 1061 return; 1062 } 1063 1064 /* 1065 * We need to track this for security reasons - without it, malicious target 1066 * could respond to SCSI READ without sending Data-In PDUs, which would result 1067 * in read operation on the initiator side returning random kernel data. 1068 */ 1069 if (ntohl(bhsdi->bhsdi_buffer_offset) != io->io_received) { 1070 ISCSI_SESSION_WARN(is, "data out of order; expected offset %zd, got %zd", 1071 io->io_received, (size_t)ntohl(bhsdi->bhsdi_buffer_offset)); 1072 icl_pdu_free(response); 1073 iscsi_session_reconnect(is); 1074 ISCSI_SESSION_UNLOCK(is); 1075 return; 1076 } 1077 1078 ccb = io->io_ccb; 1079 csio = &ccb->csio; 1080 1081 if (io->io_received + data_segment_len > csio->dxfer_len) { 1082 ISCSI_SESSION_WARN(is, "oversize data segment (%zd bytes " 1083 "at offset %zd, buffer is %d)", 1084 data_segment_len, io->io_received, csio->dxfer_len); 1085 icl_pdu_free(response); 1086 iscsi_session_reconnect(is); 1087 ISCSI_SESSION_UNLOCK(is); 1088 return; 1089 } 1090 1091 oreceived = io->io_received; 1092 io->io_received += data_segment_len; 1093 received = io->io_received; 1094 if ((bhsdi->bhsdi_flags & BHSDI_FLAGS_S) != 0) 1095 iscsi_outstanding_remove(is, io); 1096 ISCSI_SESSION_UNLOCK(is); 1097 1098 icl_pdu_get_data(response, 0, csio->data_ptr + oreceived, data_segment_len); 1099 1100 /* 1101 * XXX: Check DataSN. 1102 * XXX: Check F. 1103 */ 1104 if ((bhsdi->bhsdi_flags & BHSDI_FLAGS_S) == 0) { 1105 /* 1106 * Nothing more to do. 1107 */ 1108 icl_pdu_free(response); 1109 return; 1110 } 1111 1112 //ISCSI_SESSION_DEBUG(is, "got S flag; status 0x%x", bhsdi->bhsdi_status); 1113 if (bhsdi->bhsdi_status == 0) { 1114 ccb->ccb_h.status = CAM_REQ_CMP; 1115 } else { 1116 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 1117 xpt_freeze_devq(ccb->ccb_h.path, 1); 1118 ISCSI_SESSION_DEBUG(is, "freezing devq"); 1119 } 1120 ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR | CAM_DEV_QFRZN; 1121 csio->scsi_status = bhsdi->bhsdi_status; 1122 } 1123 1124 if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) { 1125 KASSERT(received <= csio->dxfer_len, 1126 ("received > csio->dxfer_len")); 1127 if (received < csio->dxfer_len) { 1128 csio->resid = ntohl(bhsdi->bhsdi_residual_count); 1129 if (csio->resid != csio->dxfer_len - received) { 1130 ISCSI_SESSION_WARN(is, "underflow mismatch: " 1131 "target indicates %d, we calculated %zd", 1132 csio->resid, csio->dxfer_len - received); 1133 } 1134 csio->resid = csio->dxfer_len - received; 1135 } 1136 } 1137 1138 xpt_done(ccb); 1139 icl_pdu_free(response); 1140 } 1141 1142 static void 1143 iscsi_pdu_handle_logout_response(struct icl_pdu *response) 1144 { 1145 1146 ISCSI_SESSION_DEBUG(PDU_SESSION(response), "logout response"); 1147 icl_pdu_free(response); 1148 } 1149 1150 static void 1151 iscsi_pdu_handle_r2t(struct icl_pdu *response) 1152 { 1153 struct icl_pdu *request; 1154 struct iscsi_session *is; 1155 struct iscsi_bhs_r2t *bhsr2t; 1156 struct iscsi_bhs_data_out *bhsdo; 1157 struct iscsi_outstanding *io; 1158 struct ccb_scsiio *csio; 1159 size_t off, len, total_len; 1160 int error; 1161 1162 is = PDU_SESSION(response); 1163 1164 bhsr2t = (struct iscsi_bhs_r2t *)response->ip_bhs; 1165 io = iscsi_outstanding_find(is, bhsr2t->bhsr2t_initiator_task_tag); 1166 if (io == NULL || io->io_ccb == NULL) { 1167 ISCSI_SESSION_WARN(is, "bad itt 0x%x; reconnecting", 1168 bhsr2t->bhsr2t_initiator_task_tag); 1169 icl_pdu_free(response); 1170 iscsi_session_reconnect(is); 1171 return; 1172 } 1173 1174 csio = &io->io_ccb->csio; 1175 1176 if ((csio->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_OUT) { 1177 ISCSI_SESSION_WARN(is, "received R2T for read command; reconnecting"); 1178 icl_pdu_free(response); 1179 iscsi_session_reconnect(is); 1180 return; 1181 } 1182 1183 /* 1184 * XXX: Verify R2TSN. 1185 */ 1186 1187 io->io_datasn = 0; 1188 1189 off = ntohl(bhsr2t->bhsr2t_buffer_offset); 1190 if (off > csio->dxfer_len) { 1191 ISCSI_SESSION_WARN(is, "target requested invalid offset " 1192 "%zd, buffer is is %d; reconnecting", off, csio->dxfer_len); 1193 icl_pdu_free(response); 1194 iscsi_session_reconnect(is); 1195 return; 1196 } 1197 1198 total_len = ntohl(bhsr2t->bhsr2t_desired_data_transfer_length); 1199 if (total_len == 0 || total_len > csio->dxfer_len) { 1200 ISCSI_SESSION_WARN(is, "target requested invalid length " 1201 "%zd, buffer is %d; reconnecting", total_len, csio->dxfer_len); 1202 icl_pdu_free(response); 1203 iscsi_session_reconnect(is); 1204 return; 1205 } 1206 1207 //ISCSI_SESSION_DEBUG(is, "r2t; off %zd, len %zd", off, total_len); 1208 1209 for (;;) { 1210 len = total_len; 1211 1212 if (len > is->is_max_send_data_segment_length) 1213 len = is->is_max_send_data_segment_length; 1214 1215 if (off + len > csio->dxfer_len) { 1216 ISCSI_SESSION_WARN(is, "target requested invalid " 1217 "length/offset %zd, buffer is %d; reconnecting", 1218 off + len, csio->dxfer_len); 1219 icl_pdu_free(response); 1220 iscsi_session_reconnect(is); 1221 return; 1222 } 1223 1224 request = icl_pdu_new(response->ip_conn, M_NOWAIT); 1225 if (request == NULL) { 1226 icl_pdu_free(response); 1227 iscsi_session_reconnect(is); 1228 return; 1229 } 1230 1231 bhsdo = (struct iscsi_bhs_data_out *)request->ip_bhs; 1232 bhsdo->bhsdo_opcode = ISCSI_BHS_OPCODE_SCSI_DATA_OUT; 1233 bhsdo->bhsdo_lun = bhsr2t->bhsr2t_lun; 1234 bhsdo->bhsdo_initiator_task_tag = 1235 bhsr2t->bhsr2t_initiator_task_tag; 1236 bhsdo->bhsdo_target_transfer_tag = 1237 bhsr2t->bhsr2t_target_transfer_tag; 1238 bhsdo->bhsdo_datasn = htonl(io->io_datasn++); 1239 bhsdo->bhsdo_buffer_offset = htonl(off); 1240 error = icl_pdu_append_data(request, csio->data_ptr + off, len, 1241 M_NOWAIT); 1242 if (error != 0) { 1243 ISCSI_SESSION_WARN(is, "failed to allocate memory; " 1244 "reconnecting"); 1245 icl_pdu_free(request); 1246 icl_pdu_free(response); 1247 iscsi_session_reconnect(is); 1248 return; 1249 } 1250 1251 off += len; 1252 total_len -= len; 1253 1254 if (total_len == 0) { 1255 bhsdo->bhsdo_flags |= BHSDO_FLAGS_F; 1256 //ISCSI_SESSION_DEBUG(is, "setting F, off %zd", off); 1257 } else { 1258 //ISCSI_SESSION_DEBUG(is, "not finished, off %zd", off); 1259 } 1260 1261 iscsi_pdu_queue_locked(request); 1262 1263 if (total_len == 0) 1264 break; 1265 } 1266 1267 icl_pdu_free(response); 1268 } 1269 1270 static void 1271 iscsi_pdu_handle_async_message(struct icl_pdu *response) 1272 { 1273 struct iscsi_bhs_asynchronous_message *bhsam; 1274 struct iscsi_session *is; 1275 1276 is = PDU_SESSION(response); 1277 bhsam = (struct iscsi_bhs_asynchronous_message *)response->ip_bhs; 1278 switch (bhsam->bhsam_async_event) { 1279 case BHSAM_EVENT_TARGET_REQUESTS_LOGOUT: 1280 ISCSI_SESSION_WARN(is, "target requests logout; removing session"); 1281 iscsi_session_logout(is); 1282 iscsi_session_terminate(is); 1283 break; 1284 case BHSAM_EVENT_TARGET_TERMINATES_CONNECTION: 1285 ISCSI_SESSION_WARN(is, "target indicates it will drop the connection"); 1286 break; 1287 case BHSAM_EVENT_TARGET_TERMINATES_SESSION: 1288 ISCSI_SESSION_WARN(is, "target indicates it will drop the session"); 1289 break; 1290 default: 1291 /* 1292 * XXX: Technically, we're obligated to also handle 1293 * parameter renegotiation. 1294 */ 1295 ISCSI_SESSION_WARN(is, "ignoring AsyncEvent %d", bhsam->bhsam_async_event); 1296 break; 1297 } 1298 1299 icl_pdu_free(response); 1300 } 1301 1302 static void 1303 iscsi_pdu_handle_reject(struct icl_pdu *response) 1304 { 1305 struct iscsi_bhs_reject *bhsr; 1306 struct iscsi_session *is; 1307 1308 is = PDU_SESSION(response); 1309 bhsr = (struct iscsi_bhs_reject *)response->ip_bhs; 1310 ISCSI_SESSION_WARN(is, "received Reject PDU, reason 0x%x; protocol error?", 1311 bhsr->bhsr_reason); 1312 1313 icl_pdu_free(response); 1314 } 1315 1316 static int 1317 iscsi_ioctl_daemon_wait(struct iscsi_softc *sc, 1318 struct iscsi_daemon_request *request) 1319 { 1320 struct iscsi_session *is; 1321 struct icl_drv_limits idl; 1322 int error; 1323 1324 sx_slock(&sc->sc_lock); 1325 for (;;) { 1326 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1327 ISCSI_SESSION_LOCK(is); 1328 if (is->is_conf.isc_enable == 0 && 1329 is->is_conf.isc_discovery == 0) { 1330 ISCSI_SESSION_UNLOCK(is); 1331 continue; 1332 } 1333 if (is->is_waiting_for_iscsid) 1334 break; 1335 ISCSI_SESSION_UNLOCK(is); 1336 } 1337 1338 if (is == NULL) { 1339 /* 1340 * No session requires attention from iscsid(8); wait. 1341 */ 1342 error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock); 1343 if (error != 0) { 1344 sx_sunlock(&sc->sc_lock); 1345 return (error); 1346 } 1347 continue; 1348 } 1349 1350 is->is_waiting_for_iscsid = false; 1351 is->is_login_phase = true; 1352 is->is_reason[0] = '\0'; 1353 ISCSI_SESSION_UNLOCK(is); 1354 1355 request->idr_session_id = is->is_id; 1356 memcpy(&request->idr_isid, &is->is_isid, 1357 sizeof(request->idr_isid)); 1358 request->idr_tsih = 0; /* New or reinstated session. */ 1359 memcpy(&request->idr_conf, &is->is_conf, 1360 sizeof(request->idr_conf)); 1361 1362 error = icl_limits(is->is_conf.isc_offload, 1363 is->is_conf.isc_iser, &idl); 1364 if (error != 0) { 1365 ISCSI_SESSION_WARN(is, "icl_limits for offload \"%s\" " 1366 "failed with error %d", is->is_conf.isc_offload, 1367 error); 1368 sx_sunlock(&sc->sc_lock); 1369 return (error); 1370 } 1371 request->idr_limits.isl_max_recv_data_segment_length = 1372 idl.idl_max_recv_data_segment_length; 1373 request->idr_limits.isl_max_send_data_segment_length = 1374 idl.idl_max_send_data_segment_length; 1375 request->idr_limits.isl_max_burst_length = 1376 idl.idl_max_burst_length; 1377 request->idr_limits.isl_first_burst_length = 1378 idl.idl_first_burst_length; 1379 1380 sx_sunlock(&sc->sc_lock); 1381 return (0); 1382 } 1383 } 1384 1385 static int 1386 iscsi_ioctl_daemon_handoff(struct iscsi_softc *sc, 1387 struct iscsi_daemon_handoff *handoff) 1388 { 1389 struct iscsi_session *is; 1390 struct icl_conn *ic; 1391 int error; 1392 1393 sx_slock(&sc->sc_lock); 1394 1395 /* 1396 * Find the session to hand off socket to. 1397 */ 1398 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1399 if (is->is_id == handoff->idh_session_id) 1400 break; 1401 } 1402 if (is == NULL) { 1403 sx_sunlock(&sc->sc_lock); 1404 return (ESRCH); 1405 } 1406 ISCSI_SESSION_LOCK(is); 1407 ic = is->is_conn; 1408 if (is->is_conf.isc_discovery || is->is_terminating) { 1409 ISCSI_SESSION_UNLOCK(is); 1410 sx_sunlock(&sc->sc_lock); 1411 return (EINVAL); 1412 } 1413 if (is->is_connected) { 1414 /* 1415 * This might have happened because another iscsid(8) 1416 * instance handed off the connection in the meantime. 1417 * Just return. 1418 */ 1419 ISCSI_SESSION_WARN(is, "handoff on already connected " 1420 "session"); 1421 ISCSI_SESSION_UNLOCK(is); 1422 sx_sunlock(&sc->sc_lock); 1423 return (EBUSY); 1424 } 1425 1426 strlcpy(is->is_target_alias, handoff->idh_target_alias, 1427 sizeof(is->is_target_alias)); 1428 is->is_tsih = handoff->idh_tsih; 1429 is->is_statsn = handoff->idh_statsn; 1430 is->is_initial_r2t = handoff->idh_initial_r2t; 1431 is->is_immediate_data = handoff->idh_immediate_data; 1432 1433 is->is_max_recv_data_segment_length = 1434 handoff->idh_max_recv_data_segment_length; 1435 is->is_max_send_data_segment_length = 1436 handoff->idh_max_send_data_segment_length; 1437 is->is_max_burst_length = handoff->idh_max_burst_length; 1438 is->is_first_burst_length = handoff->idh_first_burst_length; 1439 1440 if (handoff->idh_header_digest == ISCSI_DIGEST_CRC32C) 1441 ic->ic_header_crc32c = true; 1442 else 1443 ic->ic_header_crc32c = false; 1444 if (handoff->idh_data_digest == ISCSI_DIGEST_CRC32C) 1445 ic->ic_data_crc32c = true; 1446 else 1447 ic->ic_data_crc32c = false; 1448 ic->ic_maxtags = maxtags; 1449 1450 is->is_cmdsn = 0; 1451 is->is_expcmdsn = 0; 1452 is->is_maxcmdsn = 0; 1453 is->is_waiting_for_iscsid = false; 1454 is->is_login_phase = false; 1455 is->is_timeout = 0; 1456 is->is_connected = true; 1457 is->is_reason[0] = '\0'; 1458 1459 ISCSI_SESSION_UNLOCK(is); 1460 1461 /* 1462 * If we're going through the proxy, the idh_socket will be 0, 1463 * and the ICL module can simply ignore this call. It can also 1464 * use it to determine it's no longer in the Login phase. 1465 */ 1466 error = icl_conn_handoff(ic, handoff->idh_socket); 1467 if (error != 0) { 1468 sx_sunlock(&sc->sc_lock); 1469 iscsi_session_terminate(is); 1470 return (error); 1471 } 1472 1473 sx_sunlock(&sc->sc_lock); 1474 1475 if (is->is_sim != NULL) { 1476 /* 1477 * When reconnecting, there already is SIM allocated for the session. 1478 */ 1479 KASSERT(is->is_simq_frozen, ("reconnect without frozen simq")); 1480 ISCSI_SESSION_LOCK(is); 1481 ISCSI_SESSION_DEBUG(is, "releasing"); 1482 xpt_release_simq(is->is_sim, 1); 1483 is->is_simq_frozen = false; 1484 ISCSI_SESSION_UNLOCK(is); 1485 1486 } else { 1487 ISCSI_SESSION_LOCK(is); 1488 is->is_devq = cam_simq_alloc(ic->ic_maxtags); 1489 if (is->is_devq == NULL) { 1490 ISCSI_SESSION_WARN(is, "failed to allocate simq"); 1491 iscsi_session_terminate(is); 1492 return (ENOMEM); 1493 } 1494 1495 is->is_sim = cam_sim_alloc(iscsi_action, iscsi_poll, "iscsi", 1496 is, is->is_id /* unit */, &is->is_lock, 1497 1, ic->ic_maxtags, is->is_devq); 1498 if (is->is_sim == NULL) { 1499 ISCSI_SESSION_UNLOCK(is); 1500 ISCSI_SESSION_WARN(is, "failed to allocate SIM"); 1501 cam_simq_free(is->is_devq); 1502 iscsi_session_terminate(is); 1503 return (ENOMEM); 1504 } 1505 1506 error = xpt_bus_register(is->is_sim, NULL, 0); 1507 if (error != 0) { 1508 ISCSI_SESSION_UNLOCK(is); 1509 ISCSI_SESSION_WARN(is, "failed to register bus"); 1510 iscsi_session_terminate(is); 1511 return (ENOMEM); 1512 } 1513 1514 error = xpt_create_path(&is->is_path, /*periph*/NULL, 1515 cam_sim_path(is->is_sim), CAM_TARGET_WILDCARD, 1516 CAM_LUN_WILDCARD); 1517 if (error != CAM_REQ_CMP) { 1518 ISCSI_SESSION_UNLOCK(is); 1519 ISCSI_SESSION_WARN(is, "failed to create path"); 1520 iscsi_session_terminate(is); 1521 return (ENOMEM); 1522 } 1523 ISCSI_SESSION_UNLOCK(is); 1524 } 1525 1526 return (0); 1527 } 1528 1529 static int 1530 iscsi_ioctl_daemon_fail(struct iscsi_softc *sc, 1531 struct iscsi_daemon_fail *fail) 1532 { 1533 struct iscsi_session *is; 1534 1535 sx_slock(&sc->sc_lock); 1536 1537 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1538 if (is->is_id == fail->idf_session_id) 1539 break; 1540 } 1541 if (is == NULL) { 1542 sx_sunlock(&sc->sc_lock); 1543 return (ESRCH); 1544 } 1545 ISCSI_SESSION_LOCK(is); 1546 ISCSI_SESSION_DEBUG(is, "iscsid(8) failed: %s", 1547 fail->idf_reason); 1548 strlcpy(is->is_reason, fail->idf_reason, sizeof(is->is_reason)); 1549 //is->is_waiting_for_iscsid = false; 1550 //is->is_login_phase = true; 1551 //iscsi_session_reconnect(is); 1552 ISCSI_SESSION_UNLOCK(is); 1553 sx_sunlock(&sc->sc_lock); 1554 1555 return (0); 1556 } 1557 1558 #ifdef ICL_KERNEL_PROXY 1559 static int 1560 iscsi_ioctl_daemon_connect(struct iscsi_softc *sc, 1561 struct iscsi_daemon_connect *idc) 1562 { 1563 struct iscsi_session *is; 1564 struct sockaddr *from_sa, *to_sa; 1565 int error; 1566 1567 sx_slock(&sc->sc_lock); 1568 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1569 if (is->is_id == idc->idc_session_id) 1570 break; 1571 } 1572 if (is == NULL) { 1573 sx_sunlock(&sc->sc_lock); 1574 return (ESRCH); 1575 } 1576 sx_sunlock(&sc->sc_lock); 1577 1578 if (idc->idc_from_addrlen > 0) { 1579 error = getsockaddr(&from_sa, (void *)idc->idc_from_addr, idc->idc_from_addrlen); 1580 if (error != 0) { 1581 ISCSI_SESSION_WARN(is, 1582 "getsockaddr failed with error %d", error); 1583 return (error); 1584 } 1585 } else { 1586 from_sa = NULL; 1587 } 1588 error = getsockaddr(&to_sa, (void *)idc->idc_to_addr, idc->idc_to_addrlen); 1589 if (error != 0) { 1590 ISCSI_SESSION_WARN(is, "getsockaddr failed with error %d", 1591 error); 1592 free(from_sa, M_SONAME); 1593 return (error); 1594 } 1595 1596 ISCSI_SESSION_LOCK(is); 1597 is->is_statsn = 0; 1598 is->is_cmdsn = 0; 1599 is->is_expcmdsn = 0; 1600 is->is_maxcmdsn = 0; 1601 is->is_waiting_for_iscsid = false; 1602 is->is_login_phase = true; 1603 is->is_timeout = 0; 1604 ISCSI_SESSION_UNLOCK(is); 1605 1606 error = icl_conn_connect(is->is_conn, idc->idc_domain, 1607 idc->idc_socktype, idc->idc_protocol, from_sa, to_sa); 1608 free(from_sa, M_SONAME); 1609 free(to_sa, M_SONAME); 1610 1611 /* 1612 * Digests are always disabled during login phase. 1613 */ 1614 is->is_conn->ic_header_crc32c = false; 1615 is->is_conn->ic_data_crc32c = false; 1616 1617 return (error); 1618 } 1619 1620 static int 1621 iscsi_ioctl_daemon_send(struct iscsi_softc *sc, 1622 struct iscsi_daemon_send *ids) 1623 { 1624 struct iscsi_session *is; 1625 struct icl_pdu *ip; 1626 size_t datalen; 1627 void *data; 1628 int error; 1629 1630 sx_slock(&sc->sc_lock); 1631 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1632 if (is->is_id == ids->ids_session_id) 1633 break; 1634 } 1635 if (is == NULL) { 1636 sx_sunlock(&sc->sc_lock); 1637 return (ESRCH); 1638 } 1639 sx_sunlock(&sc->sc_lock); 1640 1641 if (is->is_login_phase == false) 1642 return (EBUSY); 1643 1644 if (is->is_terminating || is->is_reconnecting) 1645 return (EIO); 1646 1647 datalen = ids->ids_data_segment_len; 1648 if (datalen > is->is_max_send_data_segment_length) 1649 return (EINVAL); 1650 if (datalen > 0) { 1651 data = malloc(datalen, M_ISCSI, M_WAITOK); 1652 error = copyin(ids->ids_data_segment, data, datalen); 1653 if (error != 0) { 1654 free(data, M_ISCSI); 1655 return (error); 1656 } 1657 } 1658 1659 ip = icl_pdu_new(is->is_conn, M_WAITOK); 1660 memcpy(ip->ip_bhs, ids->ids_bhs, sizeof(*ip->ip_bhs)); 1661 if (datalen > 0) { 1662 error = icl_pdu_append_data(ip, data, datalen, M_WAITOK); 1663 KASSERT(error == 0, ("icl_pdu_append_data(..., M_WAITOK) failed")); 1664 free(data, M_ISCSI); 1665 } 1666 iscsi_pdu_queue(ip); 1667 1668 return (0); 1669 } 1670 1671 static int 1672 iscsi_ioctl_daemon_receive(struct iscsi_softc *sc, 1673 struct iscsi_daemon_receive *idr) 1674 { 1675 struct iscsi_session *is; 1676 struct icl_pdu *ip; 1677 void *data; 1678 int error; 1679 1680 sx_slock(&sc->sc_lock); 1681 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1682 if (is->is_id == idr->idr_session_id) 1683 break; 1684 } 1685 if (is == NULL) { 1686 sx_sunlock(&sc->sc_lock); 1687 return (ESRCH); 1688 } 1689 sx_sunlock(&sc->sc_lock); 1690 1691 if (is->is_login_phase == false) 1692 return (EBUSY); 1693 1694 ISCSI_SESSION_LOCK(is); 1695 while (is->is_login_pdu == NULL && 1696 is->is_terminating == false && 1697 is->is_reconnecting == false) { 1698 error = cv_wait_sig(&is->is_login_cv, &is->is_lock); 1699 if (error != 0) { 1700 ISCSI_SESSION_UNLOCK(is); 1701 return (error); 1702 } 1703 } 1704 if (is->is_terminating || is->is_reconnecting) { 1705 ISCSI_SESSION_UNLOCK(is); 1706 return (EIO); 1707 } 1708 ip = is->is_login_pdu; 1709 is->is_login_pdu = NULL; 1710 ISCSI_SESSION_UNLOCK(is); 1711 1712 if (ip->ip_data_len > idr->idr_data_segment_len) { 1713 icl_pdu_free(ip); 1714 return (EMSGSIZE); 1715 } 1716 1717 copyout(ip->ip_bhs, idr->idr_bhs, sizeof(*ip->ip_bhs)); 1718 if (ip->ip_data_len > 0) { 1719 data = malloc(ip->ip_data_len, M_ISCSI, M_WAITOK); 1720 icl_pdu_get_data(ip, 0, data, ip->ip_data_len); 1721 copyout(data, idr->idr_data_segment, ip->ip_data_len); 1722 free(data, M_ISCSI); 1723 } 1724 1725 icl_pdu_free(ip); 1726 1727 return (0); 1728 } 1729 #endif /* ICL_KERNEL_PROXY */ 1730 1731 static void 1732 iscsi_sanitize_session_conf(struct iscsi_session_conf *isc) 1733 { 1734 /* 1735 * Just make sure all the fields are null-terminated. 1736 * 1737 * XXX: This is not particularly secure. We should 1738 * create our own conf and then copy in relevant 1739 * fields. 1740 */ 1741 isc->isc_initiator[ISCSI_NAME_LEN - 1] = '\0'; 1742 isc->isc_initiator_addr[ISCSI_ADDR_LEN - 1] = '\0'; 1743 isc->isc_initiator_alias[ISCSI_ALIAS_LEN - 1] = '\0'; 1744 isc->isc_target[ISCSI_NAME_LEN - 1] = '\0'; 1745 isc->isc_target_addr[ISCSI_ADDR_LEN - 1] = '\0'; 1746 isc->isc_user[ISCSI_NAME_LEN - 1] = '\0'; 1747 isc->isc_secret[ISCSI_SECRET_LEN - 1] = '\0'; 1748 isc->isc_mutual_user[ISCSI_NAME_LEN - 1] = '\0'; 1749 isc->isc_mutual_secret[ISCSI_SECRET_LEN - 1] = '\0'; 1750 } 1751 1752 static bool 1753 iscsi_valid_session_conf(const struct iscsi_session_conf *isc) 1754 { 1755 1756 if (isc->isc_initiator[0] == '\0') { 1757 ISCSI_DEBUG("empty isc_initiator"); 1758 return (false); 1759 } 1760 1761 if (isc->isc_target_addr[0] == '\0') { 1762 ISCSI_DEBUG("empty isc_target_addr"); 1763 return (false); 1764 } 1765 1766 if (isc->isc_discovery != 0 && isc->isc_target[0] != 0) { 1767 ISCSI_DEBUG("non-empty isc_target for discovery session"); 1768 return (false); 1769 } 1770 1771 if (isc->isc_discovery == 0 && isc->isc_target[0] == 0) { 1772 ISCSI_DEBUG("empty isc_target for non-discovery session"); 1773 return (false); 1774 } 1775 1776 return (true); 1777 } 1778 1779 static int 1780 iscsi_ioctl_session_add(struct iscsi_softc *sc, struct iscsi_session_add *isa) 1781 { 1782 struct iscsi_session *is; 1783 const struct iscsi_session *is2; 1784 int error; 1785 1786 iscsi_sanitize_session_conf(&isa->isa_conf); 1787 if (iscsi_valid_session_conf(&isa->isa_conf) == false) 1788 return (EINVAL); 1789 1790 is = malloc(sizeof(*is), M_ISCSI, M_ZERO | M_WAITOK); 1791 memcpy(&is->is_conf, &isa->isa_conf, sizeof(is->is_conf)); 1792 1793 /* 1794 * Set some default values, from RFC 3720, section 12. 1795 * 1796 * These values are updated by the handoff IOCTL, but are 1797 * needed prior to the handoff to support sending the ISER 1798 * login PDU. 1799 */ 1800 is->is_max_recv_data_segment_length = 8192; 1801 is->is_max_send_data_segment_length = 8192; 1802 is->is_max_burst_length = 262144; 1803 is->is_first_burst_length = 65536; 1804 1805 sx_xlock(&sc->sc_lock); 1806 1807 /* 1808 * Prevent duplicates. 1809 */ 1810 TAILQ_FOREACH(is2, &sc->sc_sessions, is_next) { 1811 if (!!is->is_conf.isc_discovery != 1812 !!is2->is_conf.isc_discovery) 1813 continue; 1814 1815 if (strcmp(is->is_conf.isc_target_addr, 1816 is2->is_conf.isc_target_addr) != 0) 1817 continue; 1818 1819 if (is->is_conf.isc_discovery == 0 && 1820 strcmp(is->is_conf.isc_target, 1821 is2->is_conf.isc_target) != 0) 1822 continue; 1823 1824 sx_xunlock(&sc->sc_lock); 1825 free(is, M_ISCSI); 1826 return (EBUSY); 1827 } 1828 1829 is->is_conn = icl_new_conn(is->is_conf.isc_offload, 1830 is->is_conf.isc_iser, "iscsi", &is->is_lock); 1831 if (is->is_conn == NULL) { 1832 sx_xunlock(&sc->sc_lock); 1833 free(is, M_ISCSI); 1834 return (EINVAL); 1835 } 1836 is->is_conn->ic_receive = iscsi_receive_callback; 1837 is->is_conn->ic_error = iscsi_error_callback; 1838 is->is_conn->ic_prv0 = is; 1839 TAILQ_INIT(&is->is_outstanding); 1840 STAILQ_INIT(&is->is_postponed); 1841 mtx_init(&is->is_lock, "iscsi_lock", NULL, MTX_DEF); 1842 cv_init(&is->is_maintenance_cv, "iscsi_mt"); 1843 #ifdef ICL_KERNEL_PROXY 1844 cv_init(&is->is_login_cv, "iscsi_login"); 1845 #endif 1846 1847 is->is_softc = sc; 1848 sc->sc_last_session_id++; 1849 is->is_id = sc->sc_last_session_id; 1850 is->is_isid[0] = 0x80; /* RFC 3720, 10.12.5: 10b, "Random" ISID. */ 1851 arc4rand(&is->is_isid[1], 5, 0); 1852 is->is_tsih = 0; 1853 callout_init(&is->is_callout, 1); 1854 1855 error = kthread_add(iscsi_maintenance_thread, is, NULL, NULL, 0, 0, "iscsimt"); 1856 if (error != 0) { 1857 ISCSI_SESSION_WARN(is, "kthread_add(9) failed with error %d", error); 1858 sx_xunlock(&sc->sc_lock); 1859 return (error); 1860 } 1861 1862 callout_reset(&is->is_callout, 1 * hz, iscsi_callout, is); 1863 TAILQ_INSERT_TAIL(&sc->sc_sessions, is, is_next); 1864 1865 ISCSI_SESSION_LOCK(is); 1866 /* 1867 * Don't notify iscsid(8) if the session is disabled and it's not 1868 * a discovery session, 1869 */ 1870 if (is->is_conf.isc_enable == 0 && is->is_conf.isc_discovery == 0) { 1871 ISCSI_SESSION_UNLOCK(is); 1872 sx_xunlock(&sc->sc_lock); 1873 return (0); 1874 } 1875 1876 is->is_waiting_for_iscsid = true; 1877 strlcpy(is->is_reason, "Waiting for iscsid(8)", sizeof(is->is_reason)); 1878 ISCSI_SESSION_UNLOCK(is); 1879 cv_signal(&sc->sc_cv); 1880 sx_xunlock(&sc->sc_lock); 1881 return (0); 1882 } 1883 1884 static bool 1885 iscsi_session_conf_matches(unsigned int id1, const struct iscsi_session_conf *c1, 1886 unsigned int id2, const struct iscsi_session_conf *c2) 1887 { 1888 1889 if (id2 != 0 && id2 != id1) 1890 return (false); 1891 if (c2->isc_target[0] != '\0' && 1892 strcmp(c1->isc_target, c2->isc_target) != 0) 1893 return (false); 1894 if (c2->isc_target_addr[0] != '\0' && 1895 strcmp(c1->isc_target_addr, c2->isc_target_addr) != 0) 1896 return (false); 1897 return (true); 1898 } 1899 1900 static int 1901 iscsi_ioctl_session_remove(struct iscsi_softc *sc, 1902 struct iscsi_session_remove *isr) 1903 { 1904 struct iscsi_session *is, *tmp; 1905 bool found = false; 1906 1907 iscsi_sanitize_session_conf(&isr->isr_conf); 1908 1909 sx_xlock(&sc->sc_lock); 1910 TAILQ_FOREACH_SAFE(is, &sc->sc_sessions, is_next, tmp) { 1911 ISCSI_SESSION_LOCK(is); 1912 if (iscsi_session_conf_matches(is->is_id, &is->is_conf, 1913 isr->isr_session_id, &isr->isr_conf)) { 1914 found = true; 1915 iscsi_session_logout(is); 1916 iscsi_session_terminate(is); 1917 } 1918 ISCSI_SESSION_UNLOCK(is); 1919 } 1920 sx_xunlock(&sc->sc_lock); 1921 1922 if (!found) 1923 return (ESRCH); 1924 1925 return (0); 1926 } 1927 1928 static int 1929 iscsi_ioctl_session_list(struct iscsi_softc *sc, struct iscsi_session_list *isl) 1930 { 1931 int error; 1932 unsigned int i = 0; 1933 struct iscsi_session *is; 1934 struct iscsi_session_state iss; 1935 1936 sx_slock(&sc->sc_lock); 1937 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1938 if (i >= isl->isl_nentries) { 1939 sx_sunlock(&sc->sc_lock); 1940 return (EMSGSIZE); 1941 } 1942 memset(&iss, 0, sizeof(iss)); 1943 memcpy(&iss.iss_conf, &is->is_conf, sizeof(iss.iss_conf)); 1944 iss.iss_id = is->is_id; 1945 strlcpy(iss.iss_target_alias, is->is_target_alias, sizeof(iss.iss_target_alias)); 1946 strlcpy(iss.iss_reason, is->is_reason, sizeof(iss.iss_reason)); 1947 strlcpy(iss.iss_offload, is->is_conn->ic_offload, sizeof(iss.iss_offload)); 1948 1949 if (is->is_conn->ic_header_crc32c) 1950 iss.iss_header_digest = ISCSI_DIGEST_CRC32C; 1951 else 1952 iss.iss_header_digest = ISCSI_DIGEST_NONE; 1953 1954 if (is->is_conn->ic_data_crc32c) 1955 iss.iss_data_digest = ISCSI_DIGEST_CRC32C; 1956 else 1957 iss.iss_data_digest = ISCSI_DIGEST_NONE; 1958 1959 iss.iss_max_send_data_segment_length = 1960 is->is_max_send_data_segment_length; 1961 iss.iss_max_recv_data_segment_length = 1962 is->is_max_recv_data_segment_length; 1963 iss.iss_max_burst_length = is->is_max_burst_length; 1964 iss.iss_first_burst_length = is->is_first_burst_length; 1965 iss.iss_immediate_data = is->is_immediate_data; 1966 iss.iss_connected = is->is_connected; 1967 1968 error = copyout(&iss, isl->isl_pstates + i, sizeof(iss)); 1969 if (error != 0) { 1970 sx_sunlock(&sc->sc_lock); 1971 return (error); 1972 } 1973 i++; 1974 } 1975 sx_sunlock(&sc->sc_lock); 1976 1977 isl->isl_nentries = i; 1978 1979 return (0); 1980 } 1981 1982 static int 1983 iscsi_ioctl_session_modify(struct iscsi_softc *sc, 1984 struct iscsi_session_modify *ism) 1985 { 1986 struct iscsi_session *is; 1987 const struct iscsi_session *is2; 1988 1989 iscsi_sanitize_session_conf(&ism->ism_conf); 1990 if (iscsi_valid_session_conf(&ism->ism_conf) == false) 1991 return (EINVAL); 1992 1993 sx_xlock(&sc->sc_lock); 1994 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1995 ISCSI_SESSION_LOCK(is); 1996 if (is->is_id == ism->ism_session_id) { 1997 /* Note that the session remains locked. */ 1998 break; 1999 } 2000 ISCSI_SESSION_UNLOCK(is); 2001 } 2002 if (is == NULL) { 2003 sx_xunlock(&sc->sc_lock); 2004 return (ESRCH); 2005 } 2006 2007 /* 2008 * Prevent duplicates. 2009 */ 2010 TAILQ_FOREACH(is2, &sc->sc_sessions, is_next) { 2011 if (is == is2) 2012 continue; 2013 2014 if (!!ism->ism_conf.isc_discovery != 2015 !!is2->is_conf.isc_discovery) 2016 continue; 2017 2018 if (strcmp(ism->ism_conf.isc_target_addr, 2019 is2->is_conf.isc_target_addr) != 0) 2020 continue; 2021 2022 if (ism->ism_conf.isc_discovery == 0 && 2023 strcmp(ism->ism_conf.isc_target, 2024 is2->is_conf.isc_target) != 0) 2025 continue; 2026 2027 ISCSI_SESSION_UNLOCK(is); 2028 sx_xunlock(&sc->sc_lock); 2029 return (EBUSY); 2030 } 2031 2032 sx_xunlock(&sc->sc_lock); 2033 2034 memcpy(&is->is_conf, &ism->ism_conf, sizeof(is->is_conf)); 2035 ISCSI_SESSION_UNLOCK(is); 2036 2037 iscsi_session_reconnect(is); 2038 2039 return (0); 2040 } 2041 2042 static int 2043 iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, int mode, 2044 struct thread *td) 2045 { 2046 struct iscsi_softc *sc; 2047 2048 sc = dev->si_drv1; 2049 2050 switch (cmd) { 2051 case ISCSIDWAIT: 2052 return (iscsi_ioctl_daemon_wait(sc, 2053 (struct iscsi_daemon_request *)arg)); 2054 case ISCSIDHANDOFF: 2055 return (iscsi_ioctl_daemon_handoff(sc, 2056 (struct iscsi_daemon_handoff *)arg)); 2057 case ISCSIDFAIL: 2058 return (iscsi_ioctl_daemon_fail(sc, 2059 (struct iscsi_daemon_fail *)arg)); 2060 #ifdef ICL_KERNEL_PROXY 2061 case ISCSIDCONNECT: 2062 return (iscsi_ioctl_daemon_connect(sc, 2063 (struct iscsi_daemon_connect *)arg)); 2064 case ISCSIDSEND: 2065 return (iscsi_ioctl_daemon_send(sc, 2066 (struct iscsi_daemon_send *)arg)); 2067 case ISCSIDRECEIVE: 2068 return (iscsi_ioctl_daemon_receive(sc, 2069 (struct iscsi_daemon_receive *)arg)); 2070 #endif /* ICL_KERNEL_PROXY */ 2071 case ISCSISADD: 2072 return (iscsi_ioctl_session_add(sc, 2073 (struct iscsi_session_add *)arg)); 2074 case ISCSISREMOVE: 2075 return (iscsi_ioctl_session_remove(sc, 2076 (struct iscsi_session_remove *)arg)); 2077 case ISCSISLIST: 2078 return (iscsi_ioctl_session_list(sc, 2079 (struct iscsi_session_list *)arg)); 2080 case ISCSISMODIFY: 2081 return (iscsi_ioctl_session_modify(sc, 2082 (struct iscsi_session_modify *)arg)); 2083 default: 2084 return (EINVAL); 2085 } 2086 } 2087 2088 static struct iscsi_outstanding * 2089 iscsi_outstanding_find(struct iscsi_session *is, uint32_t initiator_task_tag) 2090 { 2091 struct iscsi_outstanding *io; 2092 2093 ISCSI_SESSION_LOCK_ASSERT(is); 2094 2095 TAILQ_FOREACH(io, &is->is_outstanding, io_next) { 2096 if (io->io_initiator_task_tag == initiator_task_tag) 2097 return (io); 2098 } 2099 return (NULL); 2100 } 2101 2102 static struct iscsi_outstanding * 2103 iscsi_outstanding_find_ccb(struct iscsi_session *is, union ccb *ccb) 2104 { 2105 struct iscsi_outstanding *io; 2106 2107 ISCSI_SESSION_LOCK_ASSERT(is); 2108 2109 TAILQ_FOREACH(io, &is->is_outstanding, io_next) { 2110 if (io->io_ccb == ccb) 2111 return (io); 2112 } 2113 return (NULL); 2114 } 2115 2116 static struct iscsi_outstanding * 2117 iscsi_outstanding_add(struct iscsi_session *is, struct icl_pdu *request, 2118 union ccb *ccb, uint32_t *initiator_task_tagp) 2119 { 2120 struct iscsi_outstanding *io; 2121 int error; 2122 2123 ISCSI_SESSION_LOCK_ASSERT(is); 2124 2125 io = uma_zalloc(iscsi_outstanding_zone, M_NOWAIT | M_ZERO); 2126 if (io == NULL) { 2127 ISCSI_SESSION_WARN(is, "failed to allocate %zd bytes", 2128 sizeof(*io)); 2129 return (NULL); 2130 } 2131 2132 error = icl_conn_task_setup(is->is_conn, request, &ccb->csio, 2133 initiator_task_tagp, &io->io_icl_prv); 2134 if (error != 0) { 2135 ISCSI_SESSION_WARN(is, 2136 "icl_conn_task_setup() failed with error %d", error); 2137 uma_zfree(iscsi_outstanding_zone, io); 2138 return (NULL); 2139 } 2140 2141 KASSERT(iscsi_outstanding_find(is, *initiator_task_tagp) == NULL, 2142 ("initiator_task_tag 0x%x already added", *initiator_task_tagp)); 2143 2144 io->io_initiator_task_tag = *initiator_task_tagp; 2145 io->io_ccb = ccb; 2146 TAILQ_INSERT_TAIL(&is->is_outstanding, io, io_next); 2147 return (io); 2148 } 2149 2150 static void 2151 iscsi_outstanding_remove(struct iscsi_session *is, struct iscsi_outstanding *io) 2152 { 2153 2154 ISCSI_SESSION_LOCK_ASSERT(is); 2155 2156 icl_conn_task_done(is->is_conn, io->io_icl_prv); 2157 TAILQ_REMOVE(&is->is_outstanding, io, io_next); 2158 uma_zfree(iscsi_outstanding_zone, io); 2159 } 2160 2161 static void 2162 iscsi_action_abort(struct iscsi_session *is, union ccb *ccb) 2163 { 2164 struct icl_pdu *request; 2165 struct iscsi_bhs_task_management_request *bhstmr; 2166 struct ccb_abort *cab = &ccb->cab; 2167 struct iscsi_outstanding *io, *aio; 2168 uint32_t initiator_task_tag; 2169 2170 ISCSI_SESSION_LOCK_ASSERT(is); 2171 2172 #if 0 2173 KASSERT(is->is_login_phase == false, ("%s called during Login Phase", __func__)); 2174 #else 2175 if (is->is_login_phase) { 2176 ccb->ccb_h.status = CAM_REQ_ABORTED; 2177 xpt_done(ccb); 2178 return; 2179 } 2180 #endif 2181 2182 aio = iscsi_outstanding_find_ccb(is, cab->abort_ccb); 2183 if (aio == NULL) { 2184 ccb->ccb_h.status = CAM_REQ_CMP; 2185 xpt_done(ccb); 2186 return; 2187 } 2188 2189 request = icl_pdu_new(is->is_conn, M_NOWAIT); 2190 if (request == NULL) { 2191 ccb->ccb_h.status = CAM_RESRC_UNAVAIL; 2192 xpt_done(ccb); 2193 return; 2194 } 2195 2196 initiator_task_tag = is->is_initiator_task_tag++; 2197 2198 io = iscsi_outstanding_add(is, request, NULL, &initiator_task_tag); 2199 if (io == NULL) { 2200 icl_pdu_free(request); 2201 ccb->ccb_h.status = CAM_RESRC_UNAVAIL; 2202 xpt_done(ccb); 2203 return; 2204 } 2205 io->io_datasn = aio->io_initiator_task_tag; 2206 2207 bhstmr = (struct iscsi_bhs_task_management_request *)request->ip_bhs; 2208 bhstmr->bhstmr_opcode = ISCSI_BHS_OPCODE_TASK_REQUEST; 2209 bhstmr->bhstmr_function = 0x80 | BHSTMR_FUNCTION_ABORT_TASK; 2210 bhstmr->bhstmr_lun = htobe64(CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun)); 2211 bhstmr->bhstmr_initiator_task_tag = initiator_task_tag; 2212 bhstmr->bhstmr_referenced_task_tag = aio->io_initiator_task_tag; 2213 2214 iscsi_pdu_queue_locked(request); 2215 } 2216 2217 static void 2218 iscsi_action_scsiio(struct iscsi_session *is, union ccb *ccb) 2219 { 2220 struct icl_pdu *request; 2221 struct iscsi_bhs_scsi_command *bhssc; 2222 struct ccb_scsiio *csio; 2223 struct iscsi_outstanding *io; 2224 size_t len; 2225 uint32_t initiator_task_tag; 2226 int error; 2227 2228 ISCSI_SESSION_LOCK_ASSERT(is); 2229 2230 #if 0 2231 KASSERT(is->is_login_phase == false, ("%s called during Login Phase", __func__)); 2232 #else 2233 if (is->is_login_phase) { 2234 ISCSI_SESSION_DEBUG(is, "called during login phase"); 2235 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 2236 xpt_freeze_devq(ccb->ccb_h.path, 1); 2237 ISCSI_SESSION_DEBUG(is, "freezing devq"); 2238 } 2239 ccb->ccb_h.status = CAM_REQ_ABORTED | CAM_DEV_QFRZN; 2240 xpt_done(ccb); 2241 return; 2242 } 2243 #endif 2244 2245 request = icl_pdu_new(is->is_conn, M_NOWAIT); 2246 if (request == NULL) { 2247 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 2248 xpt_freeze_devq(ccb->ccb_h.path, 1); 2249 ISCSI_SESSION_DEBUG(is, "freezing devq"); 2250 } 2251 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN; 2252 xpt_done(ccb); 2253 return; 2254 } 2255 2256 initiator_task_tag = is->is_initiator_task_tag++; 2257 io = iscsi_outstanding_add(is, request, ccb, &initiator_task_tag); 2258 if (io == NULL) { 2259 icl_pdu_free(request); 2260 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 2261 xpt_freeze_devq(ccb->ccb_h.path, 1); 2262 ISCSI_SESSION_DEBUG(is, "freezing devq"); 2263 } 2264 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN; 2265 xpt_done(ccb); 2266 return; 2267 } 2268 2269 csio = &ccb->csio; 2270 bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs; 2271 bhssc->bhssc_opcode = ISCSI_BHS_OPCODE_SCSI_COMMAND; 2272 bhssc->bhssc_flags |= BHSSC_FLAGS_F; 2273 switch (csio->ccb_h.flags & CAM_DIR_MASK) { 2274 case CAM_DIR_IN: 2275 bhssc->bhssc_flags |= BHSSC_FLAGS_R; 2276 break; 2277 case CAM_DIR_OUT: 2278 bhssc->bhssc_flags |= BHSSC_FLAGS_W; 2279 break; 2280 } 2281 2282 if ((ccb->ccb_h.flags & CAM_TAG_ACTION_VALID) != 0) { 2283 switch (csio->tag_action) { 2284 case MSG_HEAD_OF_Q_TAG: 2285 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_HOQ; 2286 break; 2287 case MSG_ORDERED_Q_TAG: 2288 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_ORDERED; 2289 break; 2290 case MSG_ACA_TASK: 2291 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_ACA; 2292 break; 2293 case MSG_SIMPLE_Q_TAG: 2294 default: 2295 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_SIMPLE; 2296 break; 2297 } 2298 } else 2299 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_UNTAGGED; 2300 2301 bhssc->bhssc_lun = htobe64(CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun)); 2302 bhssc->bhssc_initiator_task_tag = initiator_task_tag; 2303 bhssc->bhssc_expected_data_transfer_length = htonl(csio->dxfer_len); 2304 KASSERT(csio->cdb_len <= sizeof(bhssc->bhssc_cdb), 2305 ("unsupported CDB size %zd", (size_t)csio->cdb_len)); 2306 2307 if (csio->ccb_h.flags & CAM_CDB_POINTER) 2308 memcpy(&bhssc->bhssc_cdb, csio->cdb_io.cdb_ptr, csio->cdb_len); 2309 else 2310 memcpy(&bhssc->bhssc_cdb, csio->cdb_io.cdb_bytes, csio->cdb_len); 2311 2312 if (is->is_immediate_data && 2313 (csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT) { 2314 len = csio->dxfer_len; 2315 //ISCSI_SESSION_DEBUG(is, "adding %zd of immediate data", len); 2316 if (len > is->is_first_burst_length) { 2317 ISCSI_SESSION_DEBUG(is, "len %zd -> %d", len, is->is_first_burst_length); 2318 len = is->is_first_burst_length; 2319 } 2320 if (len > is->is_max_send_data_segment_length) { 2321 ISCSI_SESSION_DEBUG(is, "len %zd -> %d", len, 2322 is->is_max_send_data_segment_length); 2323 len = is->is_max_send_data_segment_length; 2324 } 2325 2326 error = icl_pdu_append_data(request, csio->data_ptr, len, M_NOWAIT); 2327 if (error != 0) { 2328 iscsi_outstanding_remove(is, io); 2329 icl_pdu_free(request); 2330 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 2331 xpt_freeze_devq(ccb->ccb_h.path, 1); 2332 ISCSI_SESSION_DEBUG(is, "freezing devq"); 2333 } 2334 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN; 2335 xpt_done(ccb); 2336 return; 2337 } 2338 } 2339 iscsi_pdu_queue_locked(request); 2340 } 2341 2342 static void 2343 iscsi_action(struct cam_sim *sim, union ccb *ccb) 2344 { 2345 struct iscsi_session *is; 2346 2347 is = cam_sim_softc(sim); 2348 2349 ISCSI_SESSION_LOCK_ASSERT(is); 2350 2351 if (is->is_terminating || 2352 (is->is_connected == false && fail_on_disconnection)) { 2353 ccb->ccb_h.status = CAM_DEV_NOT_THERE; 2354 xpt_done(ccb); 2355 return; 2356 } 2357 2358 switch (ccb->ccb_h.func_code) { 2359 case XPT_PATH_INQ: 2360 { 2361 struct ccb_pathinq *cpi = &ccb->cpi; 2362 2363 cpi->version_num = 1; 2364 cpi->hba_inquiry = PI_TAG_ABLE; 2365 cpi->target_sprt = 0; 2366 cpi->hba_misc = PIM_EXTLUNS; 2367 /* 2368 * XXX: It shouldn't ever be NULL; this could be turned 2369 * into a KASSERT eventually. 2370 */ 2371 if (is->is_conn == NULL) 2372 ISCSI_WARN("NULL conn"); 2373 else if (is->is_conn->ic_unmapped) 2374 cpi->hba_misc |= PIM_UNMAPPED; 2375 cpi->hba_eng_cnt = 0; 2376 cpi->max_target = 0; 2377 /* 2378 * Note that the variable below is only relevant for targets 2379 * that don't claim compliance with anything above SPC2, which 2380 * means they don't support REPORT_LUNS. 2381 */ 2382 cpi->max_lun = 255; 2383 cpi->initiator_id = ~0; 2384 strlcpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN); 2385 strlcpy(cpi->hba_vid, "iSCSI", HBA_IDLEN); 2386 strlcpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN); 2387 cpi->unit_number = cam_sim_unit(sim); 2388 cpi->bus_id = cam_sim_bus(sim); 2389 cpi->base_transfer_speed = 150000; /* XXX */ 2390 cpi->transport = XPORT_ISCSI; 2391 cpi->transport_version = 0; 2392 cpi->protocol = PROTO_SCSI; 2393 cpi->protocol_version = SCSI_REV_SPC3; 2394 cpi->maxio = MAXPHYS; 2395 cpi->ccb_h.status = CAM_REQ_CMP; 2396 break; 2397 } 2398 case XPT_GET_TRAN_SETTINGS: 2399 { 2400 struct ccb_trans_settings *cts; 2401 struct ccb_trans_settings_scsi *scsi; 2402 2403 cts = &ccb->cts; 2404 scsi = &cts->proto_specific.scsi; 2405 2406 cts->protocol = PROTO_SCSI; 2407 cts->protocol_version = SCSI_REV_SPC3; 2408 cts->transport = XPORT_ISCSI; 2409 cts->transport_version = 0; 2410 scsi->valid = CTS_SCSI_VALID_TQ; 2411 scsi->flags = CTS_SCSI_FLAGS_TAG_ENB; 2412 cts->ccb_h.status = CAM_REQ_CMP; 2413 break; 2414 } 2415 case XPT_CALC_GEOMETRY: 2416 cam_calc_geometry(&ccb->ccg, /*extended*/1); 2417 ccb->ccb_h.status = CAM_REQ_CMP; 2418 break; 2419 #if 0 2420 /* 2421 * XXX: What's the point? 2422 */ 2423 case XPT_RESET_BUS: 2424 case XPT_TERM_IO: 2425 ISCSI_SESSION_DEBUG(is, "faking success for reset, abort, or term_io"); 2426 ccb->ccb_h.status = CAM_REQ_CMP; 2427 break; 2428 #endif 2429 case XPT_ABORT: 2430 iscsi_action_abort(is, ccb); 2431 return; 2432 case XPT_SCSI_IO: 2433 iscsi_action_scsiio(is, ccb); 2434 return; 2435 default: 2436 #if 0 2437 ISCSI_SESSION_DEBUG(is, "got unsupported code 0x%x", ccb->ccb_h.func_code); 2438 #endif 2439 ccb->ccb_h.status = CAM_FUNC_NOTAVAIL; 2440 break; 2441 } 2442 xpt_done(ccb); 2443 } 2444 2445 static void 2446 iscsi_poll(struct cam_sim *sim) 2447 { 2448 2449 KASSERT(0, ("%s: you're not supposed to be here", __func__)); 2450 } 2451 2452 static void 2453 iscsi_terminate_sessions(struct iscsi_softc *sc) 2454 { 2455 struct iscsi_session *is; 2456 2457 sx_slock(&sc->sc_lock); 2458 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) 2459 iscsi_session_terminate(is); 2460 while(!TAILQ_EMPTY(&sc->sc_sessions)) { 2461 ISCSI_DEBUG("waiting for sessions to terminate"); 2462 cv_wait(&sc->sc_cv, &sc->sc_lock); 2463 } 2464 ISCSI_DEBUG("all sessions terminated"); 2465 sx_sunlock(&sc->sc_lock); 2466 } 2467 2468 static void 2469 iscsi_shutdown_pre(struct iscsi_softc *sc) 2470 { 2471 struct iscsi_session *is; 2472 2473 if (!fail_on_shutdown) 2474 return; 2475 2476 /* 2477 * If we have any sessions waiting for reconnection, request 2478 * maintenance thread to fail them immediately instead of waiting 2479 * for reconnect timeout. 2480 * 2481 * This prevents LUNs with mounted filesystems that are supported 2482 * by disconnected iSCSI sessions from hanging, however it will 2483 * fail all queued BIOs. 2484 */ 2485 ISCSI_DEBUG("forcing failing all disconnected sessions due to shutdown"); 2486 2487 fail_on_disconnection = 1; 2488 2489 sx_slock(&sc->sc_lock); 2490 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 2491 ISCSI_SESSION_LOCK(is); 2492 if (!is->is_connected) { 2493 ISCSI_SESSION_DEBUG(is, "force failing disconnected session early"); 2494 iscsi_session_reconnect(is); 2495 } 2496 ISCSI_SESSION_UNLOCK(is); 2497 } 2498 sx_sunlock(&sc->sc_lock); 2499 } 2500 2501 static void 2502 iscsi_shutdown_post(struct iscsi_softc *sc) 2503 { 2504 2505 if (!KERNEL_PANICKED()) { 2506 ISCSI_DEBUG("removing all sessions due to shutdown"); 2507 iscsi_terminate_sessions(sc); 2508 } 2509 } 2510 2511 static int 2512 iscsi_load(void) 2513 { 2514 int error; 2515 2516 sc = malloc(sizeof(*sc), M_ISCSI, M_ZERO | M_WAITOK); 2517 sx_init(&sc->sc_lock, "iscsi"); 2518 TAILQ_INIT(&sc->sc_sessions); 2519 cv_init(&sc->sc_cv, "iscsi_cv"); 2520 2521 iscsi_outstanding_zone = uma_zcreate("iscsi_outstanding", 2522 sizeof(struct iscsi_outstanding), NULL, NULL, NULL, NULL, 2523 UMA_ALIGN_PTR, 0); 2524 2525 error = make_dev_p(MAKEDEV_CHECKNAME, &sc->sc_cdev, &iscsi_cdevsw, 2526 NULL, UID_ROOT, GID_WHEEL, 0600, "iscsi"); 2527 if (error != 0) { 2528 ISCSI_WARN("failed to create device node, error %d", error); 2529 return (error); 2530 } 2531 sc->sc_cdev->si_drv1 = sc; 2532 2533 sc->sc_shutdown_pre_eh = EVENTHANDLER_REGISTER(shutdown_pre_sync, 2534 iscsi_shutdown_pre, sc, SHUTDOWN_PRI_FIRST); 2535 /* 2536 * shutdown_post_sync needs to run after filesystem shutdown and before 2537 * CAM shutdown - otherwise when rebooting with an iSCSI session that is 2538 * disconnected but has outstanding requests, dashutdown() will hang on 2539 * cam_periph_runccb(). 2540 */ 2541 sc->sc_shutdown_post_eh = EVENTHANDLER_REGISTER(shutdown_post_sync, 2542 iscsi_shutdown_post, sc, SHUTDOWN_PRI_DEFAULT - 1); 2543 2544 return (0); 2545 } 2546 2547 static int 2548 iscsi_unload(void) 2549 { 2550 2551 if (sc->sc_cdev != NULL) { 2552 ISCSI_DEBUG("removing device node"); 2553 destroy_dev(sc->sc_cdev); 2554 ISCSI_DEBUG("device node removed"); 2555 } 2556 2557 if (sc->sc_shutdown_pre_eh != NULL) 2558 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, sc->sc_shutdown_pre_eh); 2559 if (sc->sc_shutdown_post_eh != NULL) 2560 EVENTHANDLER_DEREGISTER(shutdown_post_sync, sc->sc_shutdown_post_eh); 2561 2562 iscsi_terminate_sessions(sc); 2563 2564 uma_zdestroy(iscsi_outstanding_zone); 2565 sx_destroy(&sc->sc_lock); 2566 cv_destroy(&sc->sc_cv); 2567 free(sc, M_ISCSI); 2568 return (0); 2569 } 2570 2571 static int 2572 iscsi_quiesce(void) 2573 { 2574 sx_slock(&sc->sc_lock); 2575 if (!TAILQ_EMPTY(&sc->sc_sessions)) { 2576 sx_sunlock(&sc->sc_lock); 2577 return (EBUSY); 2578 } 2579 sx_sunlock(&sc->sc_lock); 2580 return (0); 2581 } 2582 2583 static int 2584 iscsi_modevent(module_t mod, int what, void *arg) 2585 { 2586 int error; 2587 2588 switch (what) { 2589 case MOD_LOAD: 2590 error = iscsi_load(); 2591 break; 2592 case MOD_UNLOAD: 2593 error = iscsi_unload(); 2594 break; 2595 case MOD_QUIESCE: 2596 error = iscsi_quiesce(); 2597 break; 2598 default: 2599 error = EINVAL; 2600 break; 2601 } 2602 return (error); 2603 } 2604 2605 moduledata_t iscsi_data = { 2606 "iscsi", 2607 iscsi_modevent, 2608 0 2609 }; 2610 2611 DECLARE_MODULE(iscsi, iscsi_data, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 2612 MODULE_DEPEND(iscsi, cam, 1, 1, 1); 2613 MODULE_DEPEND(iscsi, icl, 1, 1, 1); 2614