1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2012 The FreeBSD Foundation 5 * 6 * This software was developed by Edward Tomasz Napierala under sponsorship 7 * from the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <sys/param.h> 36 #include <sys/condvar.h> 37 #include <sys/conf.h> 38 #include <sys/endian.h> 39 #include <sys/eventhandler.h> 40 #include <sys/file.h> 41 #include <sys/kernel.h> 42 #include <sys/kthread.h> 43 #include <sys/lock.h> 44 #include <sys/malloc.h> 45 #include <sys/mutex.h> 46 #include <sys/module.h> 47 #include <sys/socket.h> 48 #include <sys/sysctl.h> 49 #include <sys/systm.h> 50 #include <sys/sx.h> 51 #include <vm/uma.h> 52 53 #include <cam/cam.h> 54 #include <cam/cam_ccb.h> 55 #include <cam/cam_xpt.h> 56 #include <cam/cam_debug.h> 57 #include <cam/cam_sim.h> 58 #include <cam/cam_xpt_sim.h> 59 #include <cam/cam_xpt_periph.h> 60 #include <cam/cam_periph.h> 61 #include <cam/scsi/scsi_all.h> 62 #include <cam/scsi/scsi_message.h> 63 64 #include <dev/iscsi/icl.h> 65 #include <dev/iscsi/icl_wrappers.h> 66 #include <dev/iscsi/iscsi_ioctl.h> 67 #include <dev/iscsi/iscsi_proto.h> 68 #include <dev/iscsi/iscsi.h> 69 70 #ifdef ICL_KERNEL_PROXY 71 #include <sys/socketvar.h> 72 #endif 73 74 #ifdef ICL_KERNEL_PROXY 75 FEATURE(iscsi_kernel_proxy, "iSCSI initiator built with ICL_KERNEL_PROXY"); 76 #endif 77 78 /* 79 * XXX: This is global so the iscsi_unload() can access it. 80 * Think about how to do this properly. 81 */ 82 static struct iscsi_softc *sc; 83 84 SYSCTL_NODE(_kern, OID_AUTO, iscsi, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 85 "iSCSI initiator"); 86 static int debug = 1; 87 SYSCTL_INT(_kern_iscsi, OID_AUTO, debug, CTLFLAG_RWTUN, 88 &debug, 0, "Enable debug messages"); 89 static int ping_timeout = 5; 90 SYSCTL_INT(_kern_iscsi, OID_AUTO, ping_timeout, CTLFLAG_RWTUN, &ping_timeout, 91 0, "Timeout for ping (NOP-Out) requests, in seconds"); 92 static int iscsid_timeout = 60; 93 SYSCTL_INT(_kern_iscsi, OID_AUTO, iscsid_timeout, CTLFLAG_RWTUN, &iscsid_timeout, 94 0, "Time to wait for iscsid(8) to handle reconnection, in seconds"); 95 static int login_timeout = 60; 96 SYSCTL_INT(_kern_iscsi, OID_AUTO, login_timeout, CTLFLAG_RWTUN, &login_timeout, 97 0, "Time to wait for iscsid(8) to finish Login Phase, in seconds"); 98 static int maxtags = 255; 99 SYSCTL_INT(_kern_iscsi, OID_AUTO, maxtags, CTLFLAG_RWTUN, &maxtags, 100 0, "Max number of IO requests queued"); 101 static int fail_on_disconnection = 0; 102 SYSCTL_INT(_kern_iscsi, OID_AUTO, fail_on_disconnection, CTLFLAG_RWTUN, 103 &fail_on_disconnection, 0, "Destroy CAM SIM on connection failure"); 104 static int fail_on_shutdown = 1; 105 SYSCTL_INT(_kern_iscsi, OID_AUTO, fail_on_shutdown, CTLFLAG_RWTUN, 106 &fail_on_shutdown, 0, "Fail disconnected sessions on shutdown"); 107 108 static MALLOC_DEFINE(M_ISCSI, "iSCSI", "iSCSI initiator"); 109 static uma_zone_t iscsi_outstanding_zone; 110 111 #define CONN_SESSION(X) ((struct iscsi_session *)X->ic_prv0) 112 #define PDU_SESSION(X) (CONN_SESSION(X->ip_conn)) 113 114 #define ISCSI_DEBUG(X, ...) \ 115 do { \ 116 if (debug > 1) \ 117 printf("%s: " X "\n", __func__, ## __VA_ARGS__);\ 118 } while (0) 119 120 #define ISCSI_WARN(X, ...) \ 121 do { \ 122 if (debug > 0) { \ 123 printf("WARNING: %s: " X "\n", \ 124 __func__, ## __VA_ARGS__); \ 125 } \ 126 } while (0) 127 128 #define ISCSI_SESSION_DEBUG(S, X, ...) \ 129 do { \ 130 if (debug > 1) { \ 131 printf("%s: %s (%s): " X "\n", \ 132 __func__, S->is_conf.isc_target_addr, \ 133 S->is_conf.isc_target, ## __VA_ARGS__); \ 134 } \ 135 } while (0) 136 137 #define ISCSI_SESSION_WARN(S, X, ...) \ 138 do { \ 139 if (debug > 0) { \ 140 printf("WARNING: %s (%s): " X "\n", \ 141 S->is_conf.isc_target_addr, \ 142 S->is_conf.isc_target, ## __VA_ARGS__); \ 143 } \ 144 } while (0) 145 146 #define ISCSI_SESSION_LOCK(X) mtx_lock(&X->is_lock) 147 #define ISCSI_SESSION_UNLOCK(X) mtx_unlock(&X->is_lock) 148 #define ISCSI_SESSION_LOCK_ASSERT(X) mtx_assert(&X->is_lock, MA_OWNED) 149 #define ISCSI_SESSION_LOCK_ASSERT_NOT(X) mtx_assert(&X->is_lock, MA_NOTOWNED) 150 151 static int iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, 152 int mode, struct thread *td); 153 154 static struct cdevsw iscsi_cdevsw = { 155 .d_version = D_VERSION, 156 .d_ioctl = iscsi_ioctl, 157 .d_name = "iscsi", 158 }; 159 160 static void iscsi_pdu_queue_locked(struct icl_pdu *request); 161 static void iscsi_pdu_queue(struct icl_pdu *request); 162 static void iscsi_pdu_update_statsn(const struct icl_pdu *response); 163 static void iscsi_pdu_handle_nop_in(struct icl_pdu *response); 164 static void iscsi_pdu_handle_scsi_response(struct icl_pdu *response); 165 static void iscsi_pdu_handle_task_response(struct icl_pdu *response); 166 static void iscsi_pdu_handle_data_in(struct icl_pdu *response); 167 static void iscsi_pdu_handle_logout_response(struct icl_pdu *response); 168 static void iscsi_pdu_handle_r2t(struct icl_pdu *response); 169 static void iscsi_pdu_handle_async_message(struct icl_pdu *response); 170 static void iscsi_pdu_handle_reject(struct icl_pdu *response); 171 static void iscsi_session_reconnect(struct iscsi_session *is); 172 static void iscsi_session_terminate(struct iscsi_session *is); 173 static void iscsi_action(struct cam_sim *sim, union ccb *ccb); 174 static void iscsi_poll(struct cam_sim *sim); 175 static struct iscsi_outstanding *iscsi_outstanding_find(struct iscsi_session *is, 176 uint32_t initiator_task_tag); 177 static struct iscsi_outstanding *iscsi_outstanding_add(struct iscsi_session *is, 178 struct icl_pdu *request, union ccb *ccb, 179 uint32_t *initiator_task_tagp); 180 static void iscsi_outstanding_remove(struct iscsi_session *is, 181 struct iscsi_outstanding *io); 182 183 static bool 184 iscsi_pdu_prepare(struct icl_pdu *request) 185 { 186 struct iscsi_session *is; 187 struct iscsi_bhs_scsi_command *bhssc; 188 189 is = PDU_SESSION(request); 190 191 ISCSI_SESSION_LOCK_ASSERT(is); 192 193 /* 194 * We're only using fields common for all the request 195 * (initiator -> target) PDUs. 196 */ 197 bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs; 198 199 /* 200 * Data-Out PDU does not contain CmdSN. 201 */ 202 if (bhssc->bhssc_opcode != ISCSI_BHS_OPCODE_SCSI_DATA_OUT) { 203 if (ISCSI_SNGT(is->is_cmdsn, is->is_maxcmdsn) && 204 (bhssc->bhssc_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0) { 205 /* 206 * Current MaxCmdSN prevents us from sending any more 207 * SCSI Command PDUs to the target; postpone the PDU. 208 * It will get resent by either iscsi_pdu_queue(), 209 * or by maintenance thread. 210 */ 211 #if 0 212 ISCSI_SESSION_DEBUG(is, "postponing send, CmdSN %u, " 213 "ExpCmdSN %u, MaxCmdSN %u, opcode 0x%x", 214 is->is_cmdsn, is->is_expcmdsn, is->is_maxcmdsn, 215 bhssc->bhssc_opcode); 216 #endif 217 return (true); 218 } 219 bhssc->bhssc_cmdsn = htonl(is->is_cmdsn); 220 if ((bhssc->bhssc_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0) 221 is->is_cmdsn++; 222 } 223 bhssc->bhssc_expstatsn = htonl(is->is_statsn + 1); 224 225 return (false); 226 } 227 228 static void 229 iscsi_session_send_postponed(struct iscsi_session *is) 230 { 231 struct icl_pdu *request; 232 bool postpone; 233 234 ISCSI_SESSION_LOCK_ASSERT(is); 235 236 if (STAILQ_EMPTY(&is->is_postponed)) 237 return; 238 while ((request = STAILQ_FIRST(&is->is_postponed)) != NULL) { 239 postpone = iscsi_pdu_prepare(request); 240 if (postpone) 241 return; 242 STAILQ_REMOVE_HEAD(&is->is_postponed, ip_next); 243 icl_pdu_queue(request); 244 } 245 xpt_release_simq(is->is_sim, 1); 246 } 247 248 static void 249 iscsi_pdu_queue_locked(struct icl_pdu *request) 250 { 251 struct iscsi_session *is; 252 bool postpone; 253 254 is = PDU_SESSION(request); 255 ISCSI_SESSION_LOCK_ASSERT(is); 256 iscsi_session_send_postponed(is); 257 postpone = iscsi_pdu_prepare(request); 258 if (postpone) { 259 if (STAILQ_EMPTY(&is->is_postponed)) 260 xpt_freeze_simq(is->is_sim, 1); 261 STAILQ_INSERT_TAIL(&is->is_postponed, request, ip_next); 262 return; 263 } 264 icl_pdu_queue(request); 265 } 266 267 static void 268 iscsi_pdu_queue(struct icl_pdu *request) 269 { 270 struct iscsi_session *is; 271 272 is = PDU_SESSION(request); 273 ISCSI_SESSION_LOCK(is); 274 iscsi_pdu_queue_locked(request); 275 ISCSI_SESSION_UNLOCK(is); 276 } 277 278 static void 279 iscsi_session_logout(struct iscsi_session *is) 280 { 281 struct icl_pdu *request; 282 struct iscsi_bhs_logout_request *bhslr; 283 284 request = icl_pdu_new(is->is_conn, M_NOWAIT); 285 if (request == NULL) 286 return; 287 288 bhslr = (struct iscsi_bhs_logout_request *)request->ip_bhs; 289 bhslr->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_REQUEST; 290 bhslr->bhslr_reason = BHSLR_REASON_CLOSE_SESSION; 291 iscsi_pdu_queue_locked(request); 292 } 293 294 static void 295 iscsi_session_terminate_task(struct iscsi_session *is, 296 struct iscsi_outstanding *io, cam_status status) 297 { 298 299 ISCSI_SESSION_LOCK_ASSERT(is); 300 301 if (io->io_ccb != NULL) { 302 io->io_ccb->ccb_h.status &= ~(CAM_SIM_QUEUED | CAM_STATUS_MASK); 303 io->io_ccb->ccb_h.status |= status; 304 if ((io->io_ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 305 io->io_ccb->ccb_h.status |= CAM_DEV_QFRZN; 306 xpt_freeze_devq(io->io_ccb->ccb_h.path, 1); 307 ISCSI_SESSION_DEBUG(is, "freezing devq"); 308 } 309 xpt_done(io->io_ccb); 310 } 311 iscsi_outstanding_remove(is, io); 312 } 313 314 static void 315 iscsi_session_terminate_tasks(struct iscsi_session *is, cam_status status) 316 { 317 struct iscsi_outstanding *io, *tmp; 318 319 ISCSI_SESSION_LOCK_ASSERT(is); 320 321 TAILQ_FOREACH_SAFE(io, &is->is_outstanding, io_next, tmp) { 322 iscsi_session_terminate_task(is, io, status); 323 } 324 } 325 326 static void 327 iscsi_session_cleanup(struct iscsi_session *is, bool destroy_sim) 328 { 329 struct icl_pdu *pdu; 330 331 ISCSI_SESSION_LOCK_ASSERT(is); 332 333 /* 334 * Don't queue any new PDUs. 335 */ 336 if (is->is_sim != NULL && is->is_simq_frozen == false) { 337 ISCSI_SESSION_DEBUG(is, "freezing"); 338 xpt_freeze_simq(is->is_sim, 1); 339 is->is_simq_frozen = true; 340 } 341 342 /* 343 * Remove postponed PDUs. 344 */ 345 if (!STAILQ_EMPTY(&is->is_postponed)) 346 xpt_release_simq(is->is_sim, 1); 347 while ((pdu = STAILQ_FIRST(&is->is_postponed)) != NULL) { 348 STAILQ_REMOVE_HEAD(&is->is_postponed, ip_next); 349 icl_pdu_free(pdu); 350 } 351 352 if (destroy_sim == false) { 353 /* 354 * Terminate SCSI tasks, asking CAM to requeue them. 355 */ 356 iscsi_session_terminate_tasks(is, CAM_REQUEUE_REQ); 357 return; 358 } 359 360 iscsi_session_terminate_tasks(is, CAM_DEV_NOT_THERE); 361 362 if (is->is_sim == NULL) 363 return; 364 365 ISCSI_SESSION_DEBUG(is, "deregistering SIM"); 366 xpt_async(AC_LOST_DEVICE, is->is_path, NULL); 367 368 if (is->is_simq_frozen) { 369 is->is_simq_frozen = false; 370 xpt_release_simq(is->is_sim, 1); 371 } 372 373 xpt_free_path(is->is_path); 374 is->is_path = NULL; 375 xpt_bus_deregister(cam_sim_path(is->is_sim)); 376 cam_sim_free(is->is_sim, TRUE /*free_devq*/); 377 is->is_sim = NULL; 378 is->is_devq = NULL; 379 } 380 381 static void 382 iscsi_maintenance_thread_reconnect(struct iscsi_session *is) 383 { 384 385 icl_conn_close(is->is_conn); 386 387 ISCSI_SESSION_LOCK(is); 388 389 is->is_connected = false; 390 is->is_reconnecting = false; 391 is->is_login_phase = false; 392 393 #ifdef ICL_KERNEL_PROXY 394 if (is->is_login_pdu != NULL) { 395 icl_pdu_free(is->is_login_pdu); 396 is->is_login_pdu = NULL; 397 } 398 cv_signal(&is->is_login_cv); 399 #endif 400 401 if (fail_on_disconnection) { 402 ISCSI_SESSION_DEBUG(is, "connection failed, destroying devices"); 403 iscsi_session_cleanup(is, true); 404 } else { 405 iscsi_session_cleanup(is, false); 406 } 407 408 KASSERT(TAILQ_EMPTY(&is->is_outstanding), 409 ("destroying session with active tasks")); 410 KASSERT(STAILQ_EMPTY(&is->is_postponed), 411 ("destroying session with postponed PDUs")); 412 413 if (is->is_conf.isc_enable == 0 && is->is_conf.isc_discovery == 0) { 414 ISCSI_SESSION_UNLOCK(is); 415 return; 416 } 417 418 /* 419 * Request immediate reconnection from iscsid(8). 420 */ 421 //ISCSI_SESSION_DEBUG(is, "waking up iscsid(8)"); 422 is->is_waiting_for_iscsid = true; 423 strlcpy(is->is_reason, "Waiting for iscsid(8)", sizeof(is->is_reason)); 424 is->is_timeout = 0; 425 ISCSI_SESSION_UNLOCK(is); 426 cv_signal(&is->is_softc->sc_cv); 427 } 428 429 static void 430 iscsi_maintenance_thread_terminate(struct iscsi_session *is) 431 { 432 struct iscsi_softc *sc; 433 434 sc = is->is_softc; 435 sx_xlock(&sc->sc_lock); 436 TAILQ_REMOVE(&sc->sc_sessions, is, is_next); 437 sx_xunlock(&sc->sc_lock); 438 439 icl_conn_close(is->is_conn); 440 callout_drain(&is->is_callout); 441 442 ISCSI_SESSION_LOCK(is); 443 444 KASSERT(is->is_terminating, ("is_terminating == false")); 445 446 #ifdef ICL_KERNEL_PROXY 447 if (is->is_login_pdu != NULL) { 448 icl_pdu_free(is->is_login_pdu); 449 is->is_login_pdu = NULL; 450 } 451 cv_signal(&is->is_login_cv); 452 #endif 453 454 iscsi_session_cleanup(is, true); 455 456 KASSERT(TAILQ_EMPTY(&is->is_outstanding), 457 ("destroying session with active tasks")); 458 KASSERT(STAILQ_EMPTY(&is->is_postponed), 459 ("destroying session with postponed PDUs")); 460 461 ISCSI_SESSION_UNLOCK(is); 462 463 icl_conn_free(is->is_conn); 464 mtx_destroy(&is->is_lock); 465 cv_destroy(&is->is_maintenance_cv); 466 #ifdef ICL_KERNEL_PROXY 467 cv_destroy(&is->is_login_cv); 468 #endif 469 470 ISCSI_SESSION_DEBUG(is, "terminated"); 471 free(is, M_ISCSI); 472 473 /* 474 * The iscsi_unload() routine might be waiting. 475 */ 476 cv_signal(&sc->sc_cv); 477 } 478 479 static void 480 iscsi_maintenance_thread(void *arg) 481 { 482 struct iscsi_session *is = arg; 483 484 ISCSI_SESSION_LOCK(is); 485 for (;;) { 486 if (is->is_reconnecting == false && 487 is->is_terminating == false && 488 (STAILQ_EMPTY(&is->is_postponed) || 489 ISCSI_SNGT(is->is_cmdsn, is->is_maxcmdsn))) 490 cv_wait(&is->is_maintenance_cv, &is->is_lock); 491 492 /* Terminate supersedes reconnect. */ 493 if (is->is_terminating) { 494 ISCSI_SESSION_UNLOCK(is); 495 iscsi_maintenance_thread_terminate(is); 496 kthread_exit(); 497 return; 498 } 499 500 if (is->is_reconnecting) { 501 ISCSI_SESSION_UNLOCK(is); 502 iscsi_maintenance_thread_reconnect(is); 503 ISCSI_SESSION_LOCK(is); 504 continue; 505 } 506 507 iscsi_session_send_postponed(is); 508 } 509 ISCSI_SESSION_UNLOCK(is); 510 } 511 512 static void 513 iscsi_session_reconnect(struct iscsi_session *is) 514 { 515 516 /* 517 * XXX: We can't use locking here, because 518 * it's being called from various contexts. 519 * Hope it doesn't break anything. 520 */ 521 if (is->is_reconnecting) 522 return; 523 524 is->is_reconnecting = true; 525 cv_signal(&is->is_maintenance_cv); 526 } 527 528 static void 529 iscsi_session_terminate(struct iscsi_session *is) 530 { 531 532 if (is->is_terminating) 533 return; 534 535 is->is_terminating = true; 536 537 #if 0 538 iscsi_session_logout(is); 539 #endif 540 cv_signal(&is->is_maintenance_cv); 541 } 542 543 static void 544 iscsi_callout(void *context) 545 { 546 struct icl_pdu *request; 547 struct iscsi_bhs_nop_out *bhsno; 548 struct iscsi_session *is; 549 bool reconnect_needed = false; 550 551 is = context; 552 553 ISCSI_SESSION_LOCK(is); 554 if (is->is_terminating) { 555 ISCSI_SESSION_UNLOCK(is); 556 return; 557 } 558 559 callout_schedule(&is->is_callout, 1 * hz); 560 561 if (is->is_conf.isc_enable == 0) 562 goto out; 563 564 is->is_timeout++; 565 566 if (is->is_waiting_for_iscsid) { 567 if (iscsid_timeout > 0 && is->is_timeout > iscsid_timeout) { 568 ISCSI_SESSION_WARN(is, "timed out waiting for iscsid(8) " 569 "for %d seconds; reconnecting", 570 is->is_timeout); 571 reconnect_needed = true; 572 } 573 goto out; 574 } 575 576 if (is->is_login_phase) { 577 if (login_timeout > 0 && is->is_timeout > login_timeout) { 578 ISCSI_SESSION_WARN(is, "login timed out after %d seconds; " 579 "reconnecting", is->is_timeout); 580 reconnect_needed = true; 581 } 582 goto out; 583 } 584 585 if (ping_timeout <= 0) { 586 /* 587 * Pings are disabled. Don't send NOP-Out in this case. 588 * Reset the timeout, to avoid triggering reconnection, 589 * should the user decide to reenable them. 590 */ 591 is->is_timeout = 0; 592 goto out; 593 } 594 595 if (is->is_timeout >= ping_timeout) { 596 ISCSI_SESSION_WARN(is, "no ping reply (NOP-In) after %d seconds; " 597 "reconnecting", ping_timeout); 598 reconnect_needed = true; 599 goto out; 600 } 601 602 ISCSI_SESSION_UNLOCK(is); 603 604 /* 605 * If the ping was reset less than one second ago - which means 606 * that we've received some PDU during the last second - assume 607 * the traffic flows correctly and don't bother sending a NOP-Out. 608 * 609 * (It's 2 - one for one second, and one for incrementing is_timeout 610 * earlier in this routine.) 611 */ 612 if (is->is_timeout < 2) 613 return; 614 615 request = icl_pdu_new(is->is_conn, M_NOWAIT); 616 if (request == NULL) { 617 ISCSI_SESSION_WARN(is, "failed to allocate PDU"); 618 return; 619 } 620 bhsno = (struct iscsi_bhs_nop_out *)request->ip_bhs; 621 bhsno->bhsno_opcode = ISCSI_BHS_OPCODE_NOP_OUT | 622 ISCSI_BHS_OPCODE_IMMEDIATE; 623 bhsno->bhsno_flags = 0x80; 624 bhsno->bhsno_target_transfer_tag = 0xffffffff; 625 iscsi_pdu_queue(request); 626 return; 627 628 out: 629 if (is->is_terminating) { 630 ISCSI_SESSION_UNLOCK(is); 631 return; 632 } 633 634 ISCSI_SESSION_UNLOCK(is); 635 636 if (reconnect_needed) 637 iscsi_session_reconnect(is); 638 } 639 640 static void 641 iscsi_pdu_update_statsn(const struct icl_pdu *response) 642 { 643 const struct iscsi_bhs_data_in *bhsdi; 644 struct iscsi_session *is; 645 uint32_t expcmdsn, maxcmdsn, statsn; 646 647 is = PDU_SESSION(response); 648 649 ISCSI_SESSION_LOCK_ASSERT(is); 650 651 /* 652 * We're only using fields common for all the response 653 * (target -> initiator) PDUs. 654 */ 655 bhsdi = (const struct iscsi_bhs_data_in *)response->ip_bhs; 656 /* 657 * Ok, I lied. In case of Data-In, "The fields StatSN, Status, 658 * and Residual Count only have meaningful content if the S bit 659 * is set to 1", so we also need to check the bit specific for 660 * Data-In PDU. 661 */ 662 if (bhsdi->bhsdi_opcode != ISCSI_BHS_OPCODE_SCSI_DATA_IN || 663 (bhsdi->bhsdi_flags & BHSDI_FLAGS_S) != 0) { 664 statsn = ntohl(bhsdi->bhsdi_statsn); 665 if (statsn != is->is_statsn && statsn != (is->is_statsn + 1)) { 666 /* XXX: This is normal situation for MCS */ 667 ISCSI_SESSION_WARN(is, "PDU 0x%x StatSN %u != " 668 "session ExpStatSN %u (or + 1); reconnecting", 669 bhsdi->bhsdi_opcode, statsn, is->is_statsn); 670 iscsi_session_reconnect(is); 671 } 672 if (ISCSI_SNGT(statsn, is->is_statsn)) 673 is->is_statsn = statsn; 674 } 675 676 expcmdsn = ntohl(bhsdi->bhsdi_expcmdsn); 677 maxcmdsn = ntohl(bhsdi->bhsdi_maxcmdsn); 678 679 if (ISCSI_SNLT(maxcmdsn + 1, expcmdsn)) { 680 ISCSI_SESSION_DEBUG(is, 681 "PDU MaxCmdSN %u + 1 < PDU ExpCmdSN %u; ignoring", 682 maxcmdsn, expcmdsn); 683 } else { 684 if (ISCSI_SNGT(maxcmdsn, is->is_maxcmdsn)) { 685 is->is_maxcmdsn = maxcmdsn; 686 687 /* 688 * Command window increased; kick the maintanance thread 689 * to send out postponed commands. 690 */ 691 if (!STAILQ_EMPTY(&is->is_postponed)) 692 cv_signal(&is->is_maintenance_cv); 693 } else if (ISCSI_SNLT(maxcmdsn, is->is_maxcmdsn)) { 694 /* XXX: This is normal situation for MCS */ 695 ISCSI_SESSION_DEBUG(is, 696 "PDU MaxCmdSN %u < session MaxCmdSN %u; ignoring", 697 maxcmdsn, is->is_maxcmdsn); 698 } 699 700 if (ISCSI_SNGT(expcmdsn, is->is_expcmdsn)) { 701 is->is_expcmdsn = expcmdsn; 702 } else if (ISCSI_SNLT(expcmdsn, is->is_expcmdsn)) { 703 /* XXX: This is normal situation for MCS */ 704 ISCSI_SESSION_DEBUG(is, 705 "PDU ExpCmdSN %u < session ExpCmdSN %u; ignoring", 706 expcmdsn, is->is_expcmdsn); 707 } 708 } 709 710 /* 711 * Every incoming PDU - not just NOP-In - resets the ping timer. 712 * The purpose of the timeout is to reset the connection when it stalls; 713 * we don't want this to happen when NOP-In or NOP-Out ends up delayed 714 * in some queue. 715 */ 716 is->is_timeout = 0; 717 } 718 719 static void 720 iscsi_receive_callback(struct icl_pdu *response) 721 { 722 struct iscsi_session *is; 723 724 is = PDU_SESSION(response); 725 726 ISCSI_SESSION_LOCK(is); 727 728 iscsi_pdu_update_statsn(response); 729 730 #ifdef ICL_KERNEL_PROXY 731 if (is->is_login_phase) { 732 if (is->is_login_pdu == NULL) 733 is->is_login_pdu = response; 734 else 735 icl_pdu_free(response); 736 ISCSI_SESSION_UNLOCK(is); 737 cv_signal(&is->is_login_cv); 738 return; 739 } 740 #endif 741 742 /* 743 * The handling routine is responsible for freeing the PDU 744 * when it's no longer needed. 745 */ 746 switch (response->ip_bhs->bhs_opcode) { 747 case ISCSI_BHS_OPCODE_NOP_IN: 748 iscsi_pdu_handle_nop_in(response); 749 ISCSI_SESSION_UNLOCK(is); 750 break; 751 case ISCSI_BHS_OPCODE_SCSI_RESPONSE: 752 iscsi_pdu_handle_scsi_response(response); 753 /* Session lock dropped inside. */ 754 ISCSI_SESSION_LOCK_ASSERT_NOT(is); 755 break; 756 case ISCSI_BHS_OPCODE_TASK_RESPONSE: 757 iscsi_pdu_handle_task_response(response); 758 ISCSI_SESSION_UNLOCK(is); 759 break; 760 case ISCSI_BHS_OPCODE_SCSI_DATA_IN: 761 iscsi_pdu_handle_data_in(response); 762 /* Session lock dropped inside. */ 763 ISCSI_SESSION_LOCK_ASSERT_NOT(is); 764 break; 765 case ISCSI_BHS_OPCODE_LOGOUT_RESPONSE: 766 iscsi_pdu_handle_logout_response(response); 767 ISCSI_SESSION_UNLOCK(is); 768 break; 769 case ISCSI_BHS_OPCODE_R2T: 770 iscsi_pdu_handle_r2t(response); 771 ISCSI_SESSION_UNLOCK(is); 772 break; 773 case ISCSI_BHS_OPCODE_ASYNC_MESSAGE: 774 iscsi_pdu_handle_async_message(response); 775 ISCSI_SESSION_UNLOCK(is); 776 break; 777 case ISCSI_BHS_OPCODE_REJECT: 778 iscsi_pdu_handle_reject(response); 779 ISCSI_SESSION_UNLOCK(is); 780 break; 781 default: 782 ISCSI_SESSION_WARN(is, "received PDU with unsupported " 783 "opcode 0x%x; reconnecting", 784 response->ip_bhs->bhs_opcode); 785 iscsi_session_reconnect(is); 786 ISCSI_SESSION_UNLOCK(is); 787 icl_pdu_free(response); 788 } 789 } 790 791 static void 792 iscsi_error_callback(struct icl_conn *ic) 793 { 794 struct iscsi_session *is; 795 796 is = CONN_SESSION(ic); 797 798 ISCSI_SESSION_WARN(is, "connection error; reconnecting"); 799 iscsi_session_reconnect(is); 800 } 801 802 static void 803 iscsi_pdu_handle_nop_in(struct icl_pdu *response) 804 { 805 struct iscsi_session *is; 806 struct iscsi_bhs_nop_out *bhsno; 807 struct iscsi_bhs_nop_in *bhsni; 808 struct icl_pdu *request; 809 void *data = NULL; 810 size_t datasize; 811 int error; 812 813 is = PDU_SESSION(response); 814 bhsni = (struct iscsi_bhs_nop_in *)response->ip_bhs; 815 816 if (bhsni->bhsni_target_transfer_tag == 0xffffffff) { 817 /* 818 * Nothing to do; iscsi_pdu_update_statsn() already 819 * zeroed the timeout. 820 */ 821 icl_pdu_free(response); 822 return; 823 } 824 825 datasize = icl_pdu_data_segment_length(response); 826 if (datasize > 0) { 827 data = malloc(datasize, M_ISCSI, M_NOWAIT | M_ZERO); 828 if (data == NULL) { 829 ISCSI_SESSION_WARN(is, "failed to allocate memory; " 830 "reconnecting"); 831 icl_pdu_free(response); 832 iscsi_session_reconnect(is); 833 return; 834 } 835 icl_pdu_get_data(response, 0, data, datasize); 836 } 837 838 request = icl_pdu_new(response->ip_conn, M_NOWAIT); 839 if (request == NULL) { 840 ISCSI_SESSION_WARN(is, "failed to allocate memory; " 841 "reconnecting"); 842 free(data, M_ISCSI); 843 icl_pdu_free(response); 844 iscsi_session_reconnect(is); 845 return; 846 } 847 bhsno = (struct iscsi_bhs_nop_out *)request->ip_bhs; 848 bhsno->bhsno_opcode = ISCSI_BHS_OPCODE_NOP_OUT | 849 ISCSI_BHS_OPCODE_IMMEDIATE; 850 bhsno->bhsno_flags = 0x80; 851 bhsno->bhsno_initiator_task_tag = 0xffffffff; 852 bhsno->bhsno_target_transfer_tag = bhsni->bhsni_target_transfer_tag; 853 if (datasize > 0) { 854 error = icl_pdu_append_data(request, data, datasize, M_NOWAIT); 855 if (error != 0) { 856 ISCSI_SESSION_WARN(is, "failed to allocate memory; " 857 "reconnecting"); 858 free(data, M_ISCSI); 859 icl_pdu_free(request); 860 icl_pdu_free(response); 861 iscsi_session_reconnect(is); 862 return; 863 } 864 free(data, M_ISCSI); 865 } 866 867 icl_pdu_free(response); 868 iscsi_pdu_queue_locked(request); 869 } 870 871 static void 872 iscsi_pdu_handle_scsi_response(struct icl_pdu *response) 873 { 874 struct iscsi_bhs_scsi_response *bhssr; 875 struct iscsi_outstanding *io; 876 struct iscsi_session *is; 877 union ccb *ccb; 878 struct ccb_scsiio *csio; 879 size_t data_segment_len, received; 880 uint16_t sense_len; 881 uint32_t resid; 882 883 is = PDU_SESSION(response); 884 885 bhssr = (struct iscsi_bhs_scsi_response *)response->ip_bhs; 886 io = iscsi_outstanding_find(is, bhssr->bhssr_initiator_task_tag); 887 if (io == NULL || io->io_ccb == NULL) { 888 ISCSI_SESSION_WARN(is, "bad itt 0x%x", bhssr->bhssr_initiator_task_tag); 889 icl_pdu_free(response); 890 iscsi_session_reconnect(is); 891 ISCSI_SESSION_UNLOCK(is); 892 return; 893 } 894 895 ccb = io->io_ccb; 896 897 /* 898 * With iSER, after getting good response we can be sure 899 * that all the data has been successfully transferred. 900 */ 901 if (is->is_conn->ic_iser) { 902 resid = ntohl(bhssr->bhssr_residual_count); 903 if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_UNDERFLOW) { 904 io->io_received = ccb->csio.dxfer_len - resid; 905 } else if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_OVERFLOW) { 906 ISCSI_SESSION_WARN(is, "overflow: target indicates %d", resid); 907 } else { 908 io->io_received = ccb->csio.dxfer_len; 909 } 910 } 911 912 received = io->io_received; 913 iscsi_outstanding_remove(is, io); 914 ISCSI_SESSION_UNLOCK(is); 915 916 if (bhssr->bhssr_response != BHSSR_RESPONSE_COMMAND_COMPLETED) { 917 ISCSI_SESSION_WARN(is, "service response 0x%x", bhssr->bhssr_response); 918 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 919 xpt_freeze_devq(ccb->ccb_h.path, 1); 920 ISCSI_SESSION_DEBUG(is, "freezing devq"); 921 } 922 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN; 923 } else if (bhssr->bhssr_status == 0) { 924 ccb->ccb_h.status = CAM_REQ_CMP; 925 } else { 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_SCSI_STATUS_ERROR | CAM_DEV_QFRZN; 931 ccb->csio.scsi_status = bhssr->bhssr_status; 932 } 933 934 csio = &ccb->csio; 935 data_segment_len = icl_pdu_data_segment_length(response); 936 if (data_segment_len > 0) { 937 if (data_segment_len < sizeof(sense_len)) { 938 ISCSI_SESSION_WARN(is, "truncated data segment (%zd bytes)", 939 data_segment_len); 940 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 941 xpt_freeze_devq(ccb->ccb_h.path, 1); 942 ISCSI_SESSION_DEBUG(is, "freezing devq"); 943 } 944 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN; 945 goto out; 946 } 947 icl_pdu_get_data(response, 0, &sense_len, sizeof(sense_len)); 948 sense_len = ntohs(sense_len); 949 #if 0 950 ISCSI_SESSION_DEBUG(is, "sense_len %d, data len %zd", 951 sense_len, data_segment_len); 952 #endif 953 if (sizeof(sense_len) + sense_len > data_segment_len) { 954 ISCSI_SESSION_WARN(is, "truncated data segment " 955 "(%zd bytes, should be %zd)", 956 data_segment_len, sizeof(sense_len) + sense_len); 957 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 958 xpt_freeze_devq(ccb->ccb_h.path, 1); 959 ISCSI_SESSION_DEBUG(is, "freezing devq"); 960 } 961 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN; 962 goto out; 963 } else if (sizeof(sense_len) + sense_len < data_segment_len) 964 ISCSI_SESSION_WARN(is, "oversize data segment " 965 "(%zd bytes, should be %zd)", 966 data_segment_len, sizeof(sense_len) + sense_len); 967 if (sense_len > csio->sense_len) { 968 ISCSI_SESSION_DEBUG(is, "truncating sense from %d to %d", 969 sense_len, csio->sense_len); 970 sense_len = csio->sense_len; 971 } 972 icl_pdu_get_data(response, sizeof(sense_len), &csio->sense_data, sense_len); 973 csio->sense_resid = csio->sense_len - sense_len; 974 ccb->ccb_h.status |= CAM_AUTOSNS_VALID; 975 } 976 977 out: 978 if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_UNDERFLOW) 979 csio->resid = ntohl(bhssr->bhssr_residual_count); 980 981 if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) { 982 KASSERT(received <= csio->dxfer_len, 983 ("received > csio->dxfer_len")); 984 if (received < csio->dxfer_len) { 985 if (csio->resid != csio->dxfer_len - received) { 986 ISCSI_SESSION_WARN(is, "underflow mismatch: " 987 "target indicates %d, we calculated %zd", 988 csio->resid, csio->dxfer_len - received); 989 } 990 csio->resid = csio->dxfer_len - received; 991 } 992 } 993 994 xpt_done(ccb); 995 icl_pdu_free(response); 996 } 997 998 static void 999 iscsi_pdu_handle_task_response(struct icl_pdu *response) 1000 { 1001 struct iscsi_bhs_task_management_response *bhstmr; 1002 struct iscsi_outstanding *io, *aio; 1003 struct iscsi_session *is; 1004 1005 is = PDU_SESSION(response); 1006 1007 bhstmr = (struct iscsi_bhs_task_management_response *)response->ip_bhs; 1008 io = iscsi_outstanding_find(is, bhstmr->bhstmr_initiator_task_tag); 1009 if (io == NULL || io->io_ccb != NULL) { 1010 ISCSI_SESSION_WARN(is, "bad itt 0x%x", 1011 bhstmr->bhstmr_initiator_task_tag); 1012 icl_pdu_free(response); 1013 iscsi_session_reconnect(is); 1014 return; 1015 } 1016 1017 if (bhstmr->bhstmr_response != BHSTMR_RESPONSE_FUNCTION_COMPLETE) { 1018 ISCSI_SESSION_WARN(is, "task response 0x%x", 1019 bhstmr->bhstmr_response); 1020 } else { 1021 aio = iscsi_outstanding_find(is, io->io_datasn); 1022 if (aio != NULL && aio->io_ccb != NULL) 1023 iscsi_session_terminate_task(is, aio, CAM_REQ_ABORTED); 1024 } 1025 1026 iscsi_outstanding_remove(is, io); 1027 icl_pdu_free(response); 1028 } 1029 1030 static void 1031 iscsi_pdu_handle_data_in(struct icl_pdu *response) 1032 { 1033 struct iscsi_bhs_data_in *bhsdi; 1034 struct iscsi_outstanding *io; 1035 struct iscsi_session *is; 1036 union ccb *ccb; 1037 struct ccb_scsiio *csio; 1038 size_t data_segment_len, received, oreceived; 1039 1040 is = PDU_SESSION(response); 1041 bhsdi = (struct iscsi_bhs_data_in *)response->ip_bhs; 1042 io = iscsi_outstanding_find(is, bhsdi->bhsdi_initiator_task_tag); 1043 if (io == NULL || io->io_ccb == NULL) { 1044 ISCSI_SESSION_WARN(is, "bad itt 0x%x", bhsdi->bhsdi_initiator_task_tag); 1045 icl_pdu_free(response); 1046 iscsi_session_reconnect(is); 1047 ISCSI_SESSION_UNLOCK(is); 1048 return; 1049 } 1050 1051 data_segment_len = icl_pdu_data_segment_length(response); 1052 if (data_segment_len == 0) { 1053 /* 1054 * "The sending of 0 length data segments should be avoided, 1055 * but initiators and targets MUST be able to properly receive 1056 * 0 length data segments." 1057 */ 1058 ISCSI_SESSION_UNLOCK(is); 1059 icl_pdu_free(response); 1060 return; 1061 } 1062 1063 /* 1064 * We need to track this for security reasons - without it, malicious target 1065 * could respond to SCSI READ without sending Data-In PDUs, which would result 1066 * in read operation on the initiator side returning random kernel data. 1067 */ 1068 if (ntohl(bhsdi->bhsdi_buffer_offset) != io->io_received) { 1069 ISCSI_SESSION_WARN(is, "data out of order; expected offset %zd, got %zd", 1070 io->io_received, (size_t)ntohl(bhsdi->bhsdi_buffer_offset)); 1071 icl_pdu_free(response); 1072 iscsi_session_reconnect(is); 1073 ISCSI_SESSION_UNLOCK(is); 1074 return; 1075 } 1076 1077 ccb = io->io_ccb; 1078 csio = &ccb->csio; 1079 1080 if (io->io_received + data_segment_len > csio->dxfer_len) { 1081 ISCSI_SESSION_WARN(is, "oversize data segment (%zd bytes " 1082 "at offset %zd, buffer is %d)", 1083 data_segment_len, io->io_received, csio->dxfer_len); 1084 icl_pdu_free(response); 1085 iscsi_session_reconnect(is); 1086 ISCSI_SESSION_UNLOCK(is); 1087 return; 1088 } 1089 1090 oreceived = io->io_received; 1091 io->io_received += data_segment_len; 1092 received = io->io_received; 1093 if ((bhsdi->bhsdi_flags & BHSDI_FLAGS_S) != 0) 1094 iscsi_outstanding_remove(is, io); 1095 ISCSI_SESSION_UNLOCK(is); 1096 1097 icl_pdu_get_data(response, 0, csio->data_ptr + oreceived, data_segment_len); 1098 1099 /* 1100 * XXX: Check DataSN. 1101 * XXX: Check F. 1102 */ 1103 if ((bhsdi->bhsdi_flags & BHSDI_FLAGS_S) == 0) { 1104 /* 1105 * Nothing more to do. 1106 */ 1107 icl_pdu_free(response); 1108 return; 1109 } 1110 1111 //ISCSI_SESSION_DEBUG(is, "got S flag; status 0x%x", bhsdi->bhsdi_status); 1112 if (bhsdi->bhsdi_status == 0) { 1113 ccb->ccb_h.status = CAM_REQ_CMP; 1114 } else { 1115 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 1116 xpt_freeze_devq(ccb->ccb_h.path, 1); 1117 ISCSI_SESSION_DEBUG(is, "freezing devq"); 1118 } 1119 ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR | CAM_DEV_QFRZN; 1120 csio->scsi_status = bhsdi->bhsdi_status; 1121 } 1122 1123 if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) { 1124 KASSERT(received <= csio->dxfer_len, 1125 ("received > csio->dxfer_len")); 1126 if (received < csio->dxfer_len) { 1127 csio->resid = ntohl(bhsdi->bhsdi_residual_count); 1128 if (csio->resid != csio->dxfer_len - received) { 1129 ISCSI_SESSION_WARN(is, "underflow mismatch: " 1130 "target indicates %d, we calculated %zd", 1131 csio->resid, csio->dxfer_len - received); 1132 } 1133 csio->resid = csio->dxfer_len - received; 1134 } 1135 } 1136 1137 xpt_done(ccb); 1138 icl_pdu_free(response); 1139 } 1140 1141 static void 1142 iscsi_pdu_handle_logout_response(struct icl_pdu *response) 1143 { 1144 1145 ISCSI_SESSION_DEBUG(PDU_SESSION(response), "logout response"); 1146 icl_pdu_free(response); 1147 } 1148 1149 static void 1150 iscsi_pdu_handle_r2t(struct icl_pdu *response) 1151 { 1152 struct icl_pdu *request; 1153 struct iscsi_session *is; 1154 struct iscsi_bhs_r2t *bhsr2t; 1155 struct iscsi_bhs_data_out *bhsdo; 1156 struct iscsi_outstanding *io; 1157 struct ccb_scsiio *csio; 1158 size_t off, len, total_len; 1159 int error; 1160 1161 is = PDU_SESSION(response); 1162 1163 bhsr2t = (struct iscsi_bhs_r2t *)response->ip_bhs; 1164 io = iscsi_outstanding_find(is, bhsr2t->bhsr2t_initiator_task_tag); 1165 if (io == NULL || io->io_ccb == NULL) { 1166 ISCSI_SESSION_WARN(is, "bad itt 0x%x; reconnecting", 1167 bhsr2t->bhsr2t_initiator_task_tag); 1168 icl_pdu_free(response); 1169 iscsi_session_reconnect(is); 1170 return; 1171 } 1172 1173 csio = &io->io_ccb->csio; 1174 1175 if ((csio->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_OUT) { 1176 ISCSI_SESSION_WARN(is, "received R2T for read command; reconnecting"); 1177 icl_pdu_free(response); 1178 iscsi_session_reconnect(is); 1179 return; 1180 } 1181 1182 /* 1183 * XXX: Verify R2TSN. 1184 */ 1185 1186 io->io_datasn = 0; 1187 1188 off = ntohl(bhsr2t->bhsr2t_buffer_offset); 1189 if (off > csio->dxfer_len) { 1190 ISCSI_SESSION_WARN(is, "target requested invalid offset " 1191 "%zd, buffer is is %d; reconnecting", off, csio->dxfer_len); 1192 icl_pdu_free(response); 1193 iscsi_session_reconnect(is); 1194 return; 1195 } 1196 1197 total_len = ntohl(bhsr2t->bhsr2t_desired_data_transfer_length); 1198 if (total_len == 0 || total_len > csio->dxfer_len) { 1199 ISCSI_SESSION_WARN(is, "target requested invalid length " 1200 "%zd, buffer is %d; reconnecting", total_len, csio->dxfer_len); 1201 icl_pdu_free(response); 1202 iscsi_session_reconnect(is); 1203 return; 1204 } 1205 1206 //ISCSI_SESSION_DEBUG(is, "r2t; off %zd, len %zd", off, total_len); 1207 1208 for (;;) { 1209 len = total_len; 1210 1211 if (len > is->is_max_send_data_segment_length) 1212 len = is->is_max_send_data_segment_length; 1213 1214 if (off + len > csio->dxfer_len) { 1215 ISCSI_SESSION_WARN(is, "target requested invalid " 1216 "length/offset %zd, buffer is %d; reconnecting", 1217 off + len, csio->dxfer_len); 1218 icl_pdu_free(response); 1219 iscsi_session_reconnect(is); 1220 return; 1221 } 1222 1223 request = icl_pdu_new(response->ip_conn, M_NOWAIT); 1224 if (request == NULL) { 1225 icl_pdu_free(response); 1226 iscsi_session_reconnect(is); 1227 return; 1228 } 1229 1230 bhsdo = (struct iscsi_bhs_data_out *)request->ip_bhs; 1231 bhsdo->bhsdo_opcode = ISCSI_BHS_OPCODE_SCSI_DATA_OUT; 1232 bhsdo->bhsdo_lun = bhsr2t->bhsr2t_lun; 1233 bhsdo->bhsdo_initiator_task_tag = 1234 bhsr2t->bhsr2t_initiator_task_tag; 1235 bhsdo->bhsdo_target_transfer_tag = 1236 bhsr2t->bhsr2t_target_transfer_tag; 1237 bhsdo->bhsdo_datasn = htonl(io->io_datasn++); 1238 bhsdo->bhsdo_buffer_offset = htonl(off); 1239 error = icl_pdu_append_data(request, csio->data_ptr + off, len, 1240 M_NOWAIT); 1241 if (error != 0) { 1242 ISCSI_SESSION_WARN(is, "failed to allocate memory; " 1243 "reconnecting"); 1244 icl_pdu_free(request); 1245 icl_pdu_free(response); 1246 iscsi_session_reconnect(is); 1247 return; 1248 } 1249 1250 off += len; 1251 total_len -= len; 1252 1253 if (total_len == 0) { 1254 bhsdo->bhsdo_flags |= BHSDO_FLAGS_F; 1255 //ISCSI_SESSION_DEBUG(is, "setting F, off %zd", off); 1256 } else { 1257 //ISCSI_SESSION_DEBUG(is, "not finished, off %zd", off); 1258 } 1259 1260 iscsi_pdu_queue_locked(request); 1261 1262 if (total_len == 0) 1263 break; 1264 } 1265 1266 icl_pdu_free(response); 1267 } 1268 1269 static void 1270 iscsi_pdu_handle_async_message(struct icl_pdu *response) 1271 { 1272 struct iscsi_bhs_asynchronous_message *bhsam; 1273 struct iscsi_session *is; 1274 1275 is = PDU_SESSION(response); 1276 bhsam = (struct iscsi_bhs_asynchronous_message *)response->ip_bhs; 1277 switch (bhsam->bhsam_async_event) { 1278 case BHSAM_EVENT_TARGET_REQUESTS_LOGOUT: 1279 ISCSI_SESSION_WARN(is, "target requests logout; removing session"); 1280 iscsi_session_logout(is); 1281 iscsi_session_terminate(is); 1282 break; 1283 case BHSAM_EVENT_TARGET_TERMINATES_CONNECTION: 1284 ISCSI_SESSION_WARN(is, "target indicates it will drop the connection"); 1285 break; 1286 case BHSAM_EVENT_TARGET_TERMINATES_SESSION: 1287 ISCSI_SESSION_WARN(is, "target indicates it will drop the session"); 1288 break; 1289 default: 1290 /* 1291 * XXX: Technically, we're obligated to also handle 1292 * parameter renegotiation. 1293 */ 1294 ISCSI_SESSION_WARN(is, "ignoring AsyncEvent %d", bhsam->bhsam_async_event); 1295 break; 1296 } 1297 1298 icl_pdu_free(response); 1299 } 1300 1301 static void 1302 iscsi_pdu_handle_reject(struct icl_pdu *response) 1303 { 1304 struct iscsi_bhs_reject *bhsr; 1305 struct iscsi_session *is; 1306 1307 is = PDU_SESSION(response); 1308 bhsr = (struct iscsi_bhs_reject *)response->ip_bhs; 1309 ISCSI_SESSION_WARN(is, "received Reject PDU, reason 0x%x; protocol error?", 1310 bhsr->bhsr_reason); 1311 1312 icl_pdu_free(response); 1313 } 1314 1315 static int 1316 iscsi_ioctl_daemon_wait(struct iscsi_softc *sc, 1317 struct iscsi_daemon_request *request) 1318 { 1319 struct iscsi_session *is; 1320 struct icl_drv_limits idl; 1321 int error; 1322 1323 sx_slock(&sc->sc_lock); 1324 for (;;) { 1325 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1326 ISCSI_SESSION_LOCK(is); 1327 if (is->is_conf.isc_enable == 0 && 1328 is->is_conf.isc_discovery == 0) { 1329 ISCSI_SESSION_UNLOCK(is); 1330 continue; 1331 } 1332 if (is->is_waiting_for_iscsid) 1333 break; 1334 ISCSI_SESSION_UNLOCK(is); 1335 } 1336 1337 if (is == NULL) { 1338 /* 1339 * No session requires attention from iscsid(8); wait. 1340 */ 1341 error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock); 1342 if (error != 0) { 1343 sx_sunlock(&sc->sc_lock); 1344 return (error); 1345 } 1346 continue; 1347 } 1348 1349 is->is_waiting_for_iscsid = false; 1350 is->is_login_phase = true; 1351 is->is_reason[0] = '\0'; 1352 ISCSI_SESSION_UNLOCK(is); 1353 1354 request->idr_session_id = is->is_id; 1355 memcpy(&request->idr_isid, &is->is_isid, 1356 sizeof(request->idr_isid)); 1357 request->idr_tsih = 0; /* New or reinstated session. */ 1358 memcpy(&request->idr_conf, &is->is_conf, 1359 sizeof(request->idr_conf)); 1360 1361 error = icl_limits(is->is_conf.isc_offload, 1362 is->is_conf.isc_iser, &idl); 1363 if (error != 0) { 1364 ISCSI_SESSION_WARN(is, "icl_limits for offload \"%s\" " 1365 "failed with error %d", is->is_conf.isc_offload, 1366 error); 1367 sx_sunlock(&sc->sc_lock); 1368 return (error); 1369 } 1370 request->idr_limits.isl_max_recv_data_segment_length = 1371 idl.idl_max_recv_data_segment_length; 1372 request->idr_limits.isl_max_send_data_segment_length = 1373 idl.idl_max_send_data_segment_length; 1374 request->idr_limits.isl_max_burst_length = 1375 idl.idl_max_burst_length; 1376 request->idr_limits.isl_first_burst_length = 1377 idl.idl_first_burst_length; 1378 1379 sx_sunlock(&sc->sc_lock); 1380 return (0); 1381 } 1382 } 1383 1384 static int 1385 iscsi_ioctl_daemon_handoff(struct iscsi_softc *sc, 1386 struct iscsi_daemon_handoff *handoff) 1387 { 1388 struct iscsi_session *is; 1389 struct icl_conn *ic; 1390 int error; 1391 1392 sx_slock(&sc->sc_lock); 1393 1394 /* 1395 * Find the session to hand off socket to. 1396 */ 1397 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1398 if (is->is_id == handoff->idh_session_id) 1399 break; 1400 } 1401 if (is == NULL) { 1402 sx_sunlock(&sc->sc_lock); 1403 return (ESRCH); 1404 } 1405 ISCSI_SESSION_LOCK(is); 1406 ic = is->is_conn; 1407 if (is->is_conf.isc_discovery || is->is_terminating) { 1408 ISCSI_SESSION_UNLOCK(is); 1409 sx_sunlock(&sc->sc_lock); 1410 return (EINVAL); 1411 } 1412 if (is->is_connected) { 1413 /* 1414 * This might have happened because another iscsid(8) 1415 * instance handed off the connection in the meantime. 1416 * Just return. 1417 */ 1418 ISCSI_SESSION_WARN(is, "handoff on already connected " 1419 "session"); 1420 ISCSI_SESSION_UNLOCK(is); 1421 sx_sunlock(&sc->sc_lock); 1422 return (EBUSY); 1423 } 1424 1425 strlcpy(is->is_target_alias, handoff->idh_target_alias, 1426 sizeof(is->is_target_alias)); 1427 is->is_tsih = handoff->idh_tsih; 1428 is->is_statsn = handoff->idh_statsn; 1429 is->is_protocol_level = handoff->idh_protocol_level; 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 is->is_simq_frozen = false; 1483 xpt_release_simq(is->is_sim, 1); 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 if (initiator_task_tag == 0xffffffff) 2198 initiator_task_tag = is->is_initiator_task_tag++; 2199 2200 io = iscsi_outstanding_add(is, request, NULL, &initiator_task_tag); 2201 if (io == NULL) { 2202 icl_pdu_free(request); 2203 ccb->ccb_h.status = CAM_RESRC_UNAVAIL; 2204 xpt_done(ccb); 2205 return; 2206 } 2207 io->io_datasn = aio->io_initiator_task_tag; 2208 2209 bhstmr = (struct iscsi_bhs_task_management_request *)request->ip_bhs; 2210 bhstmr->bhstmr_opcode = ISCSI_BHS_OPCODE_TASK_REQUEST; 2211 bhstmr->bhstmr_function = 0x80 | BHSTMR_FUNCTION_ABORT_TASK; 2212 bhstmr->bhstmr_lun = htobe64(CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun)); 2213 bhstmr->bhstmr_initiator_task_tag = initiator_task_tag; 2214 bhstmr->bhstmr_referenced_task_tag = aio->io_initiator_task_tag; 2215 2216 iscsi_pdu_queue_locked(request); 2217 } 2218 2219 static void 2220 iscsi_action_scsiio(struct iscsi_session *is, union ccb *ccb) 2221 { 2222 struct icl_pdu *request; 2223 struct iscsi_bhs_scsi_command *bhssc; 2224 struct ccb_scsiio *csio; 2225 struct iscsi_outstanding *io; 2226 size_t len; 2227 uint32_t initiator_task_tag; 2228 int error; 2229 2230 ISCSI_SESSION_LOCK_ASSERT(is); 2231 2232 #if 0 2233 KASSERT(is->is_login_phase == false, ("%s called during Login Phase", __func__)); 2234 #else 2235 if (is->is_login_phase) { 2236 ISCSI_SESSION_DEBUG(is, "called during login phase"); 2237 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 2238 xpt_freeze_devq(ccb->ccb_h.path, 1); 2239 ISCSI_SESSION_DEBUG(is, "freezing devq"); 2240 } 2241 ccb->ccb_h.status = CAM_REQ_ABORTED | CAM_DEV_QFRZN; 2242 xpt_done(ccb); 2243 return; 2244 } 2245 #endif 2246 2247 request = icl_pdu_new(is->is_conn, M_NOWAIT); 2248 if (request == NULL) { 2249 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 2250 xpt_freeze_devq(ccb->ccb_h.path, 1); 2251 ISCSI_SESSION_DEBUG(is, "freezing devq"); 2252 } 2253 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN; 2254 xpt_done(ccb); 2255 return; 2256 } 2257 2258 initiator_task_tag = is->is_initiator_task_tag++; 2259 if (initiator_task_tag == 0xffffffff) 2260 initiator_task_tag = is->is_initiator_task_tag++; 2261 2262 io = iscsi_outstanding_add(is, request, ccb, &initiator_task_tag); 2263 if (io == NULL) { 2264 icl_pdu_free(request); 2265 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 2266 xpt_freeze_devq(ccb->ccb_h.path, 1); 2267 ISCSI_SESSION_DEBUG(is, "freezing devq"); 2268 } 2269 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN; 2270 xpt_done(ccb); 2271 return; 2272 } 2273 2274 csio = &ccb->csio; 2275 bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs; 2276 bhssc->bhssc_opcode = ISCSI_BHS_OPCODE_SCSI_COMMAND; 2277 bhssc->bhssc_flags |= BHSSC_FLAGS_F; 2278 switch (csio->ccb_h.flags & CAM_DIR_MASK) { 2279 case CAM_DIR_IN: 2280 bhssc->bhssc_flags |= BHSSC_FLAGS_R; 2281 break; 2282 case CAM_DIR_OUT: 2283 bhssc->bhssc_flags |= BHSSC_FLAGS_W; 2284 break; 2285 } 2286 2287 if ((ccb->ccb_h.flags & CAM_TAG_ACTION_VALID) != 0) { 2288 switch (csio->tag_action) { 2289 case MSG_HEAD_OF_Q_TAG: 2290 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_HOQ; 2291 break; 2292 case MSG_ORDERED_Q_TAG: 2293 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_ORDERED; 2294 break; 2295 case MSG_ACA_TASK: 2296 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_ACA; 2297 break; 2298 case MSG_SIMPLE_Q_TAG: 2299 default: 2300 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_SIMPLE; 2301 break; 2302 } 2303 } else 2304 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_UNTAGGED; 2305 2306 if (is->is_protocol_level >= 2) { 2307 bhssc->bhssc_pri = (csio->priority << BHSSC_PRI_SHIFT) & 2308 BHSSC_PRI_MASK; 2309 } 2310 2311 bhssc->bhssc_lun = htobe64(CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun)); 2312 bhssc->bhssc_initiator_task_tag = initiator_task_tag; 2313 bhssc->bhssc_expected_data_transfer_length = htonl(csio->dxfer_len); 2314 KASSERT(csio->cdb_len <= sizeof(bhssc->bhssc_cdb), 2315 ("unsupported CDB size %zd", (size_t)csio->cdb_len)); 2316 2317 if (csio->ccb_h.flags & CAM_CDB_POINTER) 2318 memcpy(&bhssc->bhssc_cdb, csio->cdb_io.cdb_ptr, csio->cdb_len); 2319 else 2320 memcpy(&bhssc->bhssc_cdb, csio->cdb_io.cdb_bytes, csio->cdb_len); 2321 2322 if (is->is_immediate_data && 2323 (csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT) { 2324 len = csio->dxfer_len; 2325 //ISCSI_SESSION_DEBUG(is, "adding %zd of immediate data", len); 2326 if (len > is->is_first_burst_length) { 2327 ISCSI_SESSION_DEBUG(is, "len %zd -> %d", len, is->is_first_burst_length); 2328 len = is->is_first_burst_length; 2329 } 2330 if (len > is->is_max_send_data_segment_length) { 2331 ISCSI_SESSION_DEBUG(is, "len %zd -> %d", len, 2332 is->is_max_send_data_segment_length); 2333 len = is->is_max_send_data_segment_length; 2334 } 2335 2336 error = icl_pdu_append_data(request, csio->data_ptr, len, M_NOWAIT); 2337 if (error != 0) { 2338 iscsi_outstanding_remove(is, io); 2339 icl_pdu_free(request); 2340 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 2341 xpt_freeze_devq(ccb->ccb_h.path, 1); 2342 ISCSI_SESSION_DEBUG(is, "freezing devq"); 2343 } 2344 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN; 2345 xpt_done(ccb); 2346 return; 2347 } 2348 } 2349 iscsi_pdu_queue_locked(request); 2350 } 2351 2352 static void 2353 iscsi_action(struct cam_sim *sim, union ccb *ccb) 2354 { 2355 struct iscsi_session *is; 2356 2357 is = cam_sim_softc(sim); 2358 2359 ISCSI_SESSION_LOCK_ASSERT(is); 2360 2361 if (is->is_terminating || 2362 (is->is_connected == false && fail_on_disconnection)) { 2363 ccb->ccb_h.status = CAM_DEV_NOT_THERE; 2364 xpt_done(ccb); 2365 return; 2366 } 2367 2368 /* 2369 * Make sure CAM doesn't sneak in a CCB just after freezing the queue. 2370 */ 2371 if (is->is_simq_frozen == true) { 2372 ccb->ccb_h.status &= ~(CAM_SIM_QUEUED | CAM_STATUS_MASK); 2373 ccb->ccb_h.status |= CAM_REQUEUE_REQ; 2374 /* Don't freeze the devq - the SIM queue is already frozen. */ 2375 xpt_done(ccb); 2376 return; 2377 } 2378 2379 switch (ccb->ccb_h.func_code) { 2380 case XPT_PATH_INQ: 2381 { 2382 struct ccb_pathinq *cpi = &ccb->cpi; 2383 2384 cpi->version_num = 1; 2385 cpi->hba_inquiry = PI_TAG_ABLE; 2386 cpi->target_sprt = 0; 2387 cpi->hba_misc = PIM_EXTLUNS; 2388 /* 2389 * XXX: It shouldn't ever be NULL; this could be turned 2390 * into a KASSERT eventually. 2391 */ 2392 if (is->is_conn == NULL) 2393 ISCSI_WARN("NULL conn"); 2394 else if (is->is_conn->ic_unmapped) 2395 cpi->hba_misc |= PIM_UNMAPPED; 2396 cpi->hba_eng_cnt = 0; 2397 cpi->max_target = 0; 2398 /* 2399 * Note that the variable below is only relevant for targets 2400 * that don't claim compliance with anything above SPC2, which 2401 * means they don't support REPORT_LUNS. 2402 */ 2403 cpi->max_lun = 255; 2404 cpi->initiator_id = ~0; 2405 strlcpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN); 2406 strlcpy(cpi->hba_vid, "iSCSI", HBA_IDLEN); 2407 strlcpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN); 2408 cpi->unit_number = cam_sim_unit(sim); 2409 cpi->bus_id = cam_sim_bus(sim); 2410 cpi->base_transfer_speed = 150000; /* XXX */ 2411 cpi->transport = XPORT_ISCSI; 2412 cpi->transport_version = 0; 2413 cpi->protocol = PROTO_SCSI; 2414 cpi->protocol_version = SCSI_REV_SPC3; 2415 cpi->maxio = maxphys; 2416 cpi->ccb_h.status = CAM_REQ_CMP; 2417 break; 2418 } 2419 case XPT_GET_TRAN_SETTINGS: 2420 { 2421 struct ccb_trans_settings *cts; 2422 struct ccb_trans_settings_scsi *scsi; 2423 2424 cts = &ccb->cts; 2425 scsi = &cts->proto_specific.scsi; 2426 2427 cts->protocol = PROTO_SCSI; 2428 cts->protocol_version = SCSI_REV_SPC3; 2429 cts->transport = XPORT_ISCSI; 2430 cts->transport_version = 0; 2431 scsi->valid = CTS_SCSI_VALID_TQ; 2432 scsi->flags = CTS_SCSI_FLAGS_TAG_ENB; 2433 cts->ccb_h.status = CAM_REQ_CMP; 2434 break; 2435 } 2436 case XPT_CALC_GEOMETRY: 2437 cam_calc_geometry(&ccb->ccg, /*extended*/1); 2438 ccb->ccb_h.status = CAM_REQ_CMP; 2439 break; 2440 #if 0 2441 /* 2442 * XXX: What's the point? 2443 */ 2444 case XPT_RESET_BUS: 2445 case XPT_TERM_IO: 2446 ISCSI_SESSION_DEBUG(is, "faking success for reset, abort, or term_io"); 2447 ccb->ccb_h.status = CAM_REQ_CMP; 2448 break; 2449 #endif 2450 case XPT_ABORT: 2451 iscsi_action_abort(is, ccb); 2452 return; 2453 case XPT_SCSI_IO: 2454 iscsi_action_scsiio(is, ccb); 2455 return; 2456 default: 2457 #if 0 2458 ISCSI_SESSION_DEBUG(is, "got unsupported code 0x%x", ccb->ccb_h.func_code); 2459 #endif 2460 ccb->ccb_h.status = CAM_FUNC_NOTAVAIL; 2461 break; 2462 } 2463 xpt_done(ccb); 2464 } 2465 2466 static void 2467 iscsi_poll(struct cam_sim *sim) 2468 { 2469 2470 KASSERT(0, ("%s: you're not supposed to be here", __func__)); 2471 } 2472 2473 static void 2474 iscsi_terminate_sessions(struct iscsi_softc *sc) 2475 { 2476 struct iscsi_session *is; 2477 2478 sx_slock(&sc->sc_lock); 2479 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) 2480 iscsi_session_terminate(is); 2481 while(!TAILQ_EMPTY(&sc->sc_sessions)) { 2482 ISCSI_DEBUG("waiting for sessions to terminate"); 2483 cv_wait(&sc->sc_cv, &sc->sc_lock); 2484 } 2485 ISCSI_DEBUG("all sessions terminated"); 2486 sx_sunlock(&sc->sc_lock); 2487 } 2488 2489 static void 2490 iscsi_shutdown_pre(struct iscsi_softc *sc) 2491 { 2492 struct iscsi_session *is; 2493 2494 if (!fail_on_shutdown) 2495 return; 2496 2497 /* 2498 * If we have any sessions waiting for reconnection, request 2499 * maintenance thread to fail them immediately instead of waiting 2500 * for reconnect timeout. 2501 * 2502 * This prevents LUNs with mounted filesystems that are supported 2503 * by disconnected iSCSI sessions from hanging, however it will 2504 * fail all queued BIOs. 2505 */ 2506 ISCSI_DEBUG("forcing failing all disconnected sessions due to shutdown"); 2507 2508 fail_on_disconnection = 1; 2509 2510 sx_slock(&sc->sc_lock); 2511 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 2512 ISCSI_SESSION_LOCK(is); 2513 if (!is->is_connected) { 2514 ISCSI_SESSION_DEBUG(is, "force failing disconnected session early"); 2515 iscsi_session_reconnect(is); 2516 } 2517 ISCSI_SESSION_UNLOCK(is); 2518 } 2519 sx_sunlock(&sc->sc_lock); 2520 } 2521 2522 static void 2523 iscsi_shutdown_post(struct iscsi_softc *sc) 2524 { 2525 2526 if (!KERNEL_PANICKED()) { 2527 ISCSI_DEBUG("removing all sessions due to shutdown"); 2528 iscsi_terminate_sessions(sc); 2529 } 2530 } 2531 2532 static int 2533 iscsi_load(void) 2534 { 2535 int error; 2536 2537 sc = malloc(sizeof(*sc), M_ISCSI, M_ZERO | M_WAITOK); 2538 sx_init(&sc->sc_lock, "iscsi"); 2539 TAILQ_INIT(&sc->sc_sessions); 2540 cv_init(&sc->sc_cv, "iscsi_cv"); 2541 2542 iscsi_outstanding_zone = uma_zcreate("iscsi_outstanding", 2543 sizeof(struct iscsi_outstanding), NULL, NULL, NULL, NULL, 2544 UMA_ALIGN_PTR, 0); 2545 2546 error = make_dev_p(MAKEDEV_CHECKNAME, &sc->sc_cdev, &iscsi_cdevsw, 2547 NULL, UID_ROOT, GID_WHEEL, 0600, "iscsi"); 2548 if (error != 0) { 2549 ISCSI_WARN("failed to create device node, error %d", error); 2550 return (error); 2551 } 2552 sc->sc_cdev->si_drv1 = sc; 2553 2554 sc->sc_shutdown_pre_eh = EVENTHANDLER_REGISTER(shutdown_pre_sync, 2555 iscsi_shutdown_pre, sc, SHUTDOWN_PRI_FIRST); 2556 /* 2557 * shutdown_post_sync needs to run after filesystem shutdown and before 2558 * CAM shutdown - otherwise when rebooting with an iSCSI session that is 2559 * disconnected but has outstanding requests, dashutdown() will hang on 2560 * cam_periph_runccb(). 2561 */ 2562 sc->sc_shutdown_post_eh = EVENTHANDLER_REGISTER(shutdown_post_sync, 2563 iscsi_shutdown_post, sc, SHUTDOWN_PRI_DEFAULT - 1); 2564 2565 return (0); 2566 } 2567 2568 static int 2569 iscsi_unload(void) 2570 { 2571 2572 if (sc->sc_cdev != NULL) { 2573 ISCSI_DEBUG("removing device node"); 2574 destroy_dev(sc->sc_cdev); 2575 ISCSI_DEBUG("device node removed"); 2576 } 2577 2578 if (sc->sc_shutdown_pre_eh != NULL) 2579 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, sc->sc_shutdown_pre_eh); 2580 if (sc->sc_shutdown_post_eh != NULL) 2581 EVENTHANDLER_DEREGISTER(shutdown_post_sync, sc->sc_shutdown_post_eh); 2582 2583 iscsi_terminate_sessions(sc); 2584 2585 uma_zdestroy(iscsi_outstanding_zone); 2586 sx_destroy(&sc->sc_lock); 2587 cv_destroy(&sc->sc_cv); 2588 free(sc, M_ISCSI); 2589 return (0); 2590 } 2591 2592 static int 2593 iscsi_quiesce(void) 2594 { 2595 sx_slock(&sc->sc_lock); 2596 if (!TAILQ_EMPTY(&sc->sc_sessions)) { 2597 sx_sunlock(&sc->sc_lock); 2598 return (EBUSY); 2599 } 2600 sx_sunlock(&sc->sc_lock); 2601 return (0); 2602 } 2603 2604 static int 2605 iscsi_modevent(module_t mod, int what, void *arg) 2606 { 2607 int error; 2608 2609 switch (what) { 2610 case MOD_LOAD: 2611 error = iscsi_load(); 2612 break; 2613 case MOD_UNLOAD: 2614 error = iscsi_unload(); 2615 break; 2616 case MOD_QUIESCE: 2617 error = iscsi_quiesce(); 2618 break; 2619 default: 2620 error = EINVAL; 2621 break; 2622 } 2623 return (error); 2624 } 2625 2626 moduledata_t iscsi_data = { 2627 "iscsi", 2628 iscsi_modevent, 2629 0 2630 }; 2631 2632 DECLARE_MODULE(iscsi, iscsi_data, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 2633 MODULE_DEPEND(iscsi, cam, 1, 1, 1); 2634 MODULE_DEPEND(iscsi, icl, 1, 1, 1); 2635