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 struct iscsi_outstanding *iscsi_outstanding_find(struct iscsi_session *is, 175 uint32_t initiator_task_tag); 176 static struct iscsi_outstanding *iscsi_outstanding_add(struct iscsi_session *is, 177 struct icl_pdu *request, union ccb *ccb, 178 uint32_t *initiator_task_tagp); 179 static void iscsi_outstanding_remove(struct iscsi_session *is, 180 struct iscsi_outstanding *io); 181 182 static bool 183 iscsi_pdu_prepare(struct icl_pdu *request) 184 { 185 struct iscsi_session *is; 186 struct iscsi_bhs_scsi_command *bhssc; 187 188 is = PDU_SESSION(request); 189 190 ISCSI_SESSION_LOCK_ASSERT(is); 191 192 /* 193 * We're only using fields common for all the request 194 * (initiator -> target) PDUs. 195 */ 196 bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs; 197 198 /* 199 * Data-Out PDU does not contain CmdSN. 200 */ 201 if (bhssc->bhssc_opcode != ISCSI_BHS_OPCODE_SCSI_DATA_OUT) { 202 if (ISCSI_SNGT(is->is_cmdsn, is->is_maxcmdsn) && 203 (bhssc->bhssc_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0) { 204 /* 205 * Current MaxCmdSN prevents us from sending any more 206 * SCSI Command PDUs to the target; postpone the PDU. 207 * It will get resent by either iscsi_pdu_queue(), 208 * or by maintenance thread. 209 */ 210 #if 0 211 ISCSI_SESSION_DEBUG(is, "postponing send, CmdSN %u, " 212 "ExpCmdSN %u, MaxCmdSN %u, opcode 0x%x", 213 is->is_cmdsn, is->is_expcmdsn, is->is_maxcmdsn, 214 bhssc->bhssc_opcode); 215 #endif 216 return (true); 217 } 218 bhssc->bhssc_cmdsn = htonl(is->is_cmdsn); 219 if ((bhssc->bhssc_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0) 220 is->is_cmdsn++; 221 } 222 bhssc->bhssc_expstatsn = htonl(is->is_statsn + 1); 223 224 return (false); 225 } 226 227 static void 228 iscsi_session_send_postponed(struct iscsi_session *is) 229 { 230 struct icl_pdu *request; 231 bool postpone; 232 233 ISCSI_SESSION_LOCK_ASSERT(is); 234 235 if (STAILQ_EMPTY(&is->is_postponed)) 236 return; 237 while ((request = STAILQ_FIRST(&is->is_postponed)) != NULL) { 238 postpone = iscsi_pdu_prepare(request); 239 if (postpone) 240 return; 241 STAILQ_REMOVE_HEAD(&is->is_postponed, ip_next); 242 icl_pdu_queue(request); 243 } 244 xpt_release_simq(is->is_sim, 1); 245 } 246 247 static void 248 iscsi_pdu_queue_locked(struct icl_pdu *request) 249 { 250 struct iscsi_session *is; 251 bool postpone; 252 253 is = PDU_SESSION(request); 254 ISCSI_SESSION_LOCK_ASSERT(is); 255 iscsi_session_send_postponed(is); 256 postpone = iscsi_pdu_prepare(request); 257 if (postpone) { 258 if (STAILQ_EMPTY(&is->is_postponed)) 259 xpt_freeze_simq(is->is_sim, 1); 260 STAILQ_INSERT_TAIL(&is->is_postponed, request, ip_next); 261 return; 262 } 263 icl_pdu_queue(request); 264 } 265 266 static void 267 iscsi_pdu_queue(struct icl_pdu *request) 268 { 269 struct iscsi_session *is; 270 271 is = PDU_SESSION(request); 272 ISCSI_SESSION_LOCK(is); 273 iscsi_pdu_queue_locked(request); 274 ISCSI_SESSION_UNLOCK(is); 275 } 276 277 static void 278 iscsi_session_logout(struct iscsi_session *is) 279 { 280 struct icl_pdu *request; 281 struct iscsi_bhs_logout_request *bhslr; 282 283 request = icl_pdu_new(is->is_conn, M_NOWAIT); 284 if (request == NULL) 285 return; 286 287 bhslr = (struct iscsi_bhs_logout_request *)request->ip_bhs; 288 bhslr->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_REQUEST; 289 bhslr->bhslr_reason = BHSLR_REASON_CLOSE_SESSION; 290 iscsi_pdu_queue_locked(request); 291 } 292 293 static void 294 iscsi_session_terminate_task(struct iscsi_session *is, 295 struct iscsi_outstanding *io, cam_status status) 296 { 297 298 ISCSI_SESSION_LOCK_ASSERT(is); 299 300 if (io->io_ccb != NULL) { 301 io->io_ccb->ccb_h.status &= ~(CAM_SIM_QUEUED | CAM_STATUS_MASK); 302 io->io_ccb->ccb_h.status |= status; 303 if ((io->io_ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 304 io->io_ccb->ccb_h.status |= CAM_DEV_QFRZN; 305 xpt_freeze_devq(io->io_ccb->ccb_h.path, 1); 306 ISCSI_SESSION_DEBUG(is, "freezing devq"); 307 } 308 xpt_done(io->io_ccb); 309 } 310 iscsi_outstanding_remove(is, io); 311 } 312 313 static void 314 iscsi_session_terminate_tasks(struct iscsi_session *is, cam_status status) 315 { 316 struct iscsi_outstanding *io, *tmp; 317 318 ISCSI_SESSION_LOCK_ASSERT(is); 319 320 TAILQ_FOREACH_SAFE(io, &is->is_outstanding, io_next, tmp) { 321 iscsi_session_terminate_task(is, io, status); 322 } 323 } 324 325 static void 326 iscsi_session_cleanup(struct iscsi_session *is, bool destroy_sim) 327 { 328 struct icl_pdu *pdu; 329 330 ISCSI_SESSION_LOCK_ASSERT(is); 331 332 /* 333 * Don't queue any new PDUs. 334 */ 335 if (is->is_sim != NULL && is->is_simq_frozen == false) { 336 ISCSI_SESSION_DEBUG(is, "freezing"); 337 xpt_freeze_simq(is->is_sim, 1); 338 is->is_simq_frozen = true; 339 } 340 341 /* 342 * Remove postponed PDUs. 343 */ 344 if (!STAILQ_EMPTY(&is->is_postponed)) 345 xpt_release_simq(is->is_sim, 1); 346 while ((pdu = STAILQ_FIRST(&is->is_postponed)) != NULL) { 347 STAILQ_REMOVE_HEAD(&is->is_postponed, ip_next); 348 icl_pdu_free(pdu); 349 } 350 351 if (destroy_sim == false) { 352 /* 353 * Terminate SCSI tasks, asking CAM to requeue them. 354 */ 355 iscsi_session_terminate_tasks(is, CAM_REQUEUE_REQ); 356 return; 357 } 358 359 iscsi_session_terminate_tasks(is, CAM_DEV_NOT_THERE); 360 361 if (is->is_sim == NULL) 362 return; 363 364 ISCSI_SESSION_DEBUG(is, "deregistering SIM"); 365 xpt_async(AC_LOST_DEVICE, is->is_path, NULL); 366 367 if (is->is_simq_frozen) { 368 is->is_simq_frozen = false; 369 xpt_release_simq(is->is_sim, 1); 370 } 371 372 xpt_free_path(is->is_path); 373 is->is_path = NULL; 374 xpt_bus_deregister(cam_sim_path(is->is_sim)); 375 cam_sim_free(is->is_sim, TRUE /*free_devq*/); 376 is->is_sim = NULL; 377 is->is_devq = NULL; 378 } 379 380 static void 381 iscsi_maintenance_thread_reconnect(struct iscsi_session *is) 382 { 383 384 icl_conn_close(is->is_conn); 385 386 ISCSI_SESSION_LOCK(is); 387 388 is->is_connected = false; 389 is->is_reconnecting = false; 390 is->is_login_phase = false; 391 392 #ifdef ICL_KERNEL_PROXY 393 if (is->is_login_pdu != NULL) { 394 icl_pdu_free(is->is_login_pdu); 395 is->is_login_pdu = NULL; 396 } 397 cv_signal(&is->is_login_cv); 398 #endif 399 400 if (fail_on_disconnection) { 401 ISCSI_SESSION_DEBUG(is, "connection failed, destroying devices"); 402 iscsi_session_cleanup(is, true); 403 } else { 404 iscsi_session_cleanup(is, false); 405 } 406 407 KASSERT(TAILQ_EMPTY(&is->is_outstanding), 408 ("destroying session with active tasks")); 409 KASSERT(STAILQ_EMPTY(&is->is_postponed), 410 ("destroying session with postponed PDUs")); 411 412 if (is->is_conf.isc_enable == 0 && is->is_conf.isc_discovery == 0) { 413 ISCSI_SESSION_UNLOCK(is); 414 return; 415 } 416 417 /* 418 * Request immediate reconnection from iscsid(8). 419 */ 420 //ISCSI_SESSION_DEBUG(is, "waking up iscsid(8)"); 421 is->is_waiting_for_iscsid = true; 422 strlcpy(is->is_reason, "Waiting for iscsid(8)", sizeof(is->is_reason)); 423 is->is_timeout = 0; 424 ISCSI_SESSION_UNLOCK(is); 425 cv_signal(&is->is_softc->sc_cv); 426 } 427 428 static void 429 iscsi_maintenance_thread_terminate(struct iscsi_session *is) 430 { 431 struct iscsi_softc *sc; 432 433 sc = is->is_softc; 434 sx_xlock(&sc->sc_lock); 435 TAILQ_REMOVE(&sc->sc_sessions, is, is_next); 436 sx_xunlock(&sc->sc_lock); 437 438 icl_conn_close(is->is_conn); 439 callout_drain(&is->is_callout); 440 441 ISCSI_SESSION_LOCK(is); 442 443 KASSERT(is->is_terminating, ("is_terminating == false")); 444 445 #ifdef ICL_KERNEL_PROXY 446 if (is->is_login_pdu != NULL) { 447 icl_pdu_free(is->is_login_pdu); 448 is->is_login_pdu = NULL; 449 } 450 cv_signal(&is->is_login_cv); 451 #endif 452 453 iscsi_session_cleanup(is, true); 454 455 KASSERT(TAILQ_EMPTY(&is->is_outstanding), 456 ("destroying session with active tasks")); 457 KASSERT(STAILQ_EMPTY(&is->is_postponed), 458 ("destroying session with postponed PDUs")); 459 460 ISCSI_SESSION_UNLOCK(is); 461 462 icl_conn_free(is->is_conn); 463 mtx_destroy(&is->is_lock); 464 cv_destroy(&is->is_maintenance_cv); 465 #ifdef ICL_KERNEL_PROXY 466 cv_destroy(&is->is_login_cv); 467 #endif 468 469 ISCSI_SESSION_DEBUG(is, "terminated"); 470 free(is, M_ISCSI); 471 472 /* 473 * The iscsi_unload() routine might be waiting. 474 */ 475 cv_signal(&sc->sc_cv); 476 } 477 478 static void 479 iscsi_maintenance_thread(void *arg) 480 { 481 struct iscsi_session *is = arg; 482 483 ISCSI_SESSION_LOCK(is); 484 for (;;) { 485 if (is->is_reconnecting == false && 486 is->is_terminating == false && 487 (STAILQ_EMPTY(&is->is_postponed) || 488 ISCSI_SNGT(is->is_cmdsn, is->is_maxcmdsn))) 489 cv_wait(&is->is_maintenance_cv, &is->is_lock); 490 491 /* Terminate supersedes reconnect. */ 492 if (is->is_terminating) { 493 ISCSI_SESSION_UNLOCK(is); 494 iscsi_maintenance_thread_terminate(is); 495 kthread_exit(); 496 return; 497 } 498 499 if (is->is_reconnecting) { 500 ISCSI_SESSION_UNLOCK(is); 501 iscsi_maintenance_thread_reconnect(is); 502 ISCSI_SESSION_LOCK(is); 503 continue; 504 } 505 506 iscsi_session_send_postponed(is); 507 } 508 ISCSI_SESSION_UNLOCK(is); 509 } 510 511 static void 512 iscsi_session_reconnect(struct iscsi_session *is) 513 { 514 515 /* 516 * XXX: We can't use locking here, because 517 * it's being called from various contexts. 518 * Hope it doesn't break anything. 519 */ 520 if (is->is_reconnecting) 521 return; 522 523 is->is_reconnecting = true; 524 cv_signal(&is->is_maintenance_cv); 525 } 526 527 static void 528 iscsi_session_terminate(struct iscsi_session *is) 529 { 530 531 if (is->is_terminating) 532 return; 533 534 is->is_terminating = true; 535 536 #if 0 537 iscsi_session_logout(is); 538 #endif 539 cv_signal(&is->is_maintenance_cv); 540 } 541 542 static void 543 iscsi_callout(void *context) 544 { 545 struct icl_pdu *request; 546 struct iscsi_bhs_nop_out *bhsno; 547 struct iscsi_session *is; 548 bool reconnect_needed = false; 549 550 is = context; 551 552 ISCSI_SESSION_LOCK(is); 553 if (is->is_terminating) { 554 ISCSI_SESSION_UNLOCK(is); 555 return; 556 } 557 558 callout_schedule(&is->is_callout, 1 * hz); 559 560 if (is->is_conf.isc_enable == 0) 561 goto out; 562 563 is->is_timeout++; 564 565 if (is->is_waiting_for_iscsid) { 566 if (iscsid_timeout > 0 && is->is_timeout > iscsid_timeout) { 567 ISCSI_SESSION_WARN(is, "timed out waiting for iscsid(8) " 568 "for %d seconds; reconnecting", 569 is->is_timeout); 570 reconnect_needed = true; 571 } 572 goto out; 573 } 574 575 if (is->is_login_phase) { 576 if (login_timeout > 0 && is->is_timeout > login_timeout) { 577 ISCSI_SESSION_WARN(is, "login timed out after %d seconds; " 578 "reconnecting", is->is_timeout); 579 reconnect_needed = true; 580 } 581 goto out; 582 } 583 584 if (ping_timeout <= 0) { 585 /* 586 * Pings are disabled. Don't send NOP-Out in this case. 587 * Reset the timeout, to avoid triggering reconnection, 588 * should the user decide to reenable them. 589 */ 590 is->is_timeout = 0; 591 goto out; 592 } 593 594 if (is->is_timeout >= ping_timeout) { 595 ISCSI_SESSION_WARN(is, "no ping reply (NOP-In) after %d seconds; " 596 "reconnecting", ping_timeout); 597 reconnect_needed = true; 598 goto out; 599 } 600 601 ISCSI_SESSION_UNLOCK(is); 602 603 /* 604 * If the ping was reset less than one second ago - which means 605 * that we've received some PDU during the last second - assume 606 * the traffic flows correctly and don't bother sending a NOP-Out. 607 * 608 * (It's 2 - one for one second, and one for incrementing is_timeout 609 * earlier in this routine.) 610 */ 611 if (is->is_timeout < 2) 612 return; 613 614 request = icl_pdu_new(is->is_conn, M_NOWAIT); 615 if (request == NULL) { 616 ISCSI_SESSION_WARN(is, "failed to allocate PDU"); 617 return; 618 } 619 bhsno = (struct iscsi_bhs_nop_out *)request->ip_bhs; 620 bhsno->bhsno_opcode = ISCSI_BHS_OPCODE_NOP_OUT | 621 ISCSI_BHS_OPCODE_IMMEDIATE; 622 bhsno->bhsno_flags = 0x80; 623 bhsno->bhsno_target_transfer_tag = 0xffffffff; 624 iscsi_pdu_queue(request); 625 return; 626 627 out: 628 if (is->is_terminating) { 629 ISCSI_SESSION_UNLOCK(is); 630 return; 631 } 632 633 ISCSI_SESSION_UNLOCK(is); 634 635 if (reconnect_needed) 636 iscsi_session_reconnect(is); 637 } 638 639 static void 640 iscsi_pdu_update_statsn(const struct icl_pdu *response) 641 { 642 const struct iscsi_bhs_data_in *bhsdi; 643 struct iscsi_session *is; 644 uint32_t expcmdsn, maxcmdsn, statsn; 645 646 is = PDU_SESSION(response); 647 648 ISCSI_SESSION_LOCK_ASSERT(is); 649 650 /* 651 * We're only using fields common for all the response 652 * (target -> initiator) PDUs. 653 */ 654 bhsdi = (const struct iscsi_bhs_data_in *)response->ip_bhs; 655 /* 656 * Ok, I lied. In case of Data-In, "The fields StatSN, Status, 657 * and Residual Count only have meaningful content if the S bit 658 * is set to 1", so we also need to check the bit specific for 659 * Data-In PDU. 660 */ 661 if (bhsdi->bhsdi_opcode != ISCSI_BHS_OPCODE_SCSI_DATA_IN || 662 (bhsdi->bhsdi_flags & BHSDI_FLAGS_S) != 0) { 663 statsn = ntohl(bhsdi->bhsdi_statsn); 664 if (statsn != is->is_statsn && statsn != (is->is_statsn + 1)) { 665 /* XXX: This is normal situation for MCS */ 666 ISCSI_SESSION_WARN(is, "PDU 0x%x StatSN %u != " 667 "session ExpStatSN %u (or + 1); reconnecting", 668 bhsdi->bhsdi_opcode, statsn, is->is_statsn); 669 iscsi_session_reconnect(is); 670 } 671 if (ISCSI_SNGT(statsn, is->is_statsn)) 672 is->is_statsn = statsn; 673 } 674 675 expcmdsn = ntohl(bhsdi->bhsdi_expcmdsn); 676 maxcmdsn = ntohl(bhsdi->bhsdi_maxcmdsn); 677 678 if (ISCSI_SNLT(maxcmdsn + 1, expcmdsn)) { 679 ISCSI_SESSION_DEBUG(is, 680 "PDU MaxCmdSN %u + 1 < PDU ExpCmdSN %u; ignoring", 681 maxcmdsn, expcmdsn); 682 } else { 683 if (ISCSI_SNGT(maxcmdsn, is->is_maxcmdsn)) { 684 is->is_maxcmdsn = maxcmdsn; 685 686 /* 687 * Command window increased; kick the maintanance thread 688 * to send out postponed commands. 689 */ 690 if (!STAILQ_EMPTY(&is->is_postponed)) 691 cv_signal(&is->is_maintenance_cv); 692 } else if (ISCSI_SNLT(maxcmdsn, is->is_maxcmdsn)) { 693 /* XXX: This is normal situation for MCS */ 694 ISCSI_SESSION_DEBUG(is, 695 "PDU MaxCmdSN %u < session MaxCmdSN %u; ignoring", 696 maxcmdsn, is->is_maxcmdsn); 697 } 698 699 if (ISCSI_SNGT(expcmdsn, is->is_expcmdsn)) { 700 is->is_expcmdsn = expcmdsn; 701 } else if (ISCSI_SNLT(expcmdsn, is->is_expcmdsn)) { 702 /* XXX: This is normal situation for MCS */ 703 ISCSI_SESSION_DEBUG(is, 704 "PDU ExpCmdSN %u < session ExpCmdSN %u; ignoring", 705 expcmdsn, is->is_expcmdsn); 706 } 707 } 708 709 /* 710 * Every incoming PDU - not just NOP-In - resets the ping timer. 711 * The purpose of the timeout is to reset the connection when it stalls; 712 * we don't want this to happen when NOP-In or NOP-Out ends up delayed 713 * in some queue. 714 */ 715 is->is_timeout = 0; 716 } 717 718 static void 719 iscsi_receive_callback(struct icl_pdu *response) 720 { 721 struct iscsi_session *is; 722 723 is = PDU_SESSION(response); 724 725 ISCSI_SESSION_LOCK(is); 726 727 iscsi_pdu_update_statsn(response); 728 729 #ifdef ICL_KERNEL_PROXY 730 if (is->is_login_phase) { 731 if (is->is_login_pdu == NULL) 732 is->is_login_pdu = response; 733 else 734 icl_pdu_free(response); 735 ISCSI_SESSION_UNLOCK(is); 736 cv_signal(&is->is_login_cv); 737 return; 738 } 739 #endif 740 741 /* 742 * The handling routine is responsible for freeing the PDU 743 * when it's no longer needed. 744 */ 745 switch (response->ip_bhs->bhs_opcode) { 746 case ISCSI_BHS_OPCODE_NOP_IN: 747 iscsi_pdu_handle_nop_in(response); 748 ISCSI_SESSION_UNLOCK(is); 749 break; 750 case ISCSI_BHS_OPCODE_SCSI_RESPONSE: 751 iscsi_pdu_handle_scsi_response(response); 752 /* Session lock dropped inside. */ 753 ISCSI_SESSION_LOCK_ASSERT_NOT(is); 754 break; 755 case ISCSI_BHS_OPCODE_TASK_RESPONSE: 756 iscsi_pdu_handle_task_response(response); 757 ISCSI_SESSION_UNLOCK(is); 758 break; 759 case ISCSI_BHS_OPCODE_SCSI_DATA_IN: 760 iscsi_pdu_handle_data_in(response); 761 /* Session lock dropped inside. */ 762 ISCSI_SESSION_LOCK_ASSERT_NOT(is); 763 break; 764 case ISCSI_BHS_OPCODE_LOGOUT_RESPONSE: 765 iscsi_pdu_handle_logout_response(response); 766 ISCSI_SESSION_UNLOCK(is); 767 break; 768 case ISCSI_BHS_OPCODE_R2T: 769 iscsi_pdu_handle_r2t(response); 770 ISCSI_SESSION_UNLOCK(is); 771 break; 772 case ISCSI_BHS_OPCODE_ASYNC_MESSAGE: 773 iscsi_pdu_handle_async_message(response); 774 ISCSI_SESSION_UNLOCK(is); 775 break; 776 case ISCSI_BHS_OPCODE_REJECT: 777 iscsi_pdu_handle_reject(response); 778 ISCSI_SESSION_UNLOCK(is); 779 break; 780 default: 781 ISCSI_SESSION_WARN(is, "received PDU with unsupported " 782 "opcode 0x%x; reconnecting", 783 response->ip_bhs->bhs_opcode); 784 iscsi_session_reconnect(is); 785 ISCSI_SESSION_UNLOCK(is); 786 icl_pdu_free(response); 787 } 788 } 789 790 static void 791 iscsi_error_callback(struct icl_conn *ic) 792 { 793 struct iscsi_session *is; 794 795 is = CONN_SESSION(ic); 796 797 ISCSI_SESSION_WARN(is, "connection error; reconnecting"); 798 iscsi_session_reconnect(is); 799 } 800 801 static void 802 iscsi_pdu_handle_nop_in(struct icl_pdu *response) 803 { 804 struct iscsi_session *is; 805 struct iscsi_bhs_nop_out *bhsno; 806 struct iscsi_bhs_nop_in *bhsni; 807 struct icl_pdu *request; 808 void *data = NULL; 809 size_t datasize; 810 int error; 811 812 is = PDU_SESSION(response); 813 bhsni = (struct iscsi_bhs_nop_in *)response->ip_bhs; 814 815 if (bhsni->bhsni_target_transfer_tag == 0xffffffff) { 816 /* 817 * Nothing to do; iscsi_pdu_update_statsn() already 818 * zeroed the timeout. 819 */ 820 icl_pdu_free(response); 821 return; 822 } 823 824 datasize = icl_pdu_data_segment_length(response); 825 if (datasize > 0) { 826 data = malloc(datasize, M_ISCSI, M_NOWAIT | M_ZERO); 827 if (data == NULL) { 828 ISCSI_SESSION_WARN(is, "failed to allocate memory; " 829 "reconnecting"); 830 icl_pdu_free(response); 831 iscsi_session_reconnect(is); 832 return; 833 } 834 icl_pdu_get_data(response, 0, data, datasize); 835 } 836 837 request = icl_pdu_new(response->ip_conn, M_NOWAIT); 838 if (request == NULL) { 839 ISCSI_SESSION_WARN(is, "failed to allocate memory; " 840 "reconnecting"); 841 free(data, M_ISCSI); 842 icl_pdu_free(response); 843 iscsi_session_reconnect(is); 844 return; 845 } 846 bhsno = (struct iscsi_bhs_nop_out *)request->ip_bhs; 847 bhsno->bhsno_opcode = ISCSI_BHS_OPCODE_NOP_OUT | 848 ISCSI_BHS_OPCODE_IMMEDIATE; 849 bhsno->bhsno_flags = 0x80; 850 bhsno->bhsno_initiator_task_tag = 0xffffffff; 851 bhsno->bhsno_target_transfer_tag = bhsni->bhsni_target_transfer_tag; 852 if (datasize > 0) { 853 error = icl_pdu_append_data(request, data, datasize, M_NOWAIT); 854 if (error != 0) { 855 ISCSI_SESSION_WARN(is, "failed to allocate memory; " 856 "reconnecting"); 857 free(data, M_ISCSI); 858 icl_pdu_free(request); 859 icl_pdu_free(response); 860 iscsi_session_reconnect(is); 861 return; 862 } 863 free(data, M_ISCSI); 864 } 865 866 icl_pdu_free(response); 867 iscsi_pdu_queue_locked(request); 868 } 869 870 static void 871 iscsi_pdu_handle_scsi_response(struct icl_pdu *response) 872 { 873 struct iscsi_bhs_scsi_response *bhssr; 874 struct iscsi_outstanding *io; 875 struct iscsi_session *is; 876 union ccb *ccb; 877 struct ccb_scsiio *csio; 878 size_t data_segment_len, received; 879 uint16_t sense_len; 880 uint32_t resid; 881 882 is = PDU_SESSION(response); 883 884 bhssr = (struct iscsi_bhs_scsi_response *)response->ip_bhs; 885 io = iscsi_outstanding_find(is, bhssr->bhssr_initiator_task_tag); 886 if (io == NULL || io->io_ccb == NULL) { 887 ISCSI_SESSION_WARN(is, "bad itt 0x%x", bhssr->bhssr_initiator_task_tag); 888 icl_pdu_free(response); 889 iscsi_session_reconnect(is); 890 ISCSI_SESSION_UNLOCK(is); 891 return; 892 } 893 894 ccb = io->io_ccb; 895 896 /* 897 * With iSER, after getting good response we can be sure 898 * that all the data has been successfully transferred. 899 */ 900 if (is->is_conn->ic_iser) { 901 resid = ntohl(bhssr->bhssr_residual_count); 902 if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_UNDERFLOW) { 903 io->io_received = ccb->csio.dxfer_len - resid; 904 } else if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_OVERFLOW) { 905 ISCSI_SESSION_WARN(is, "overflow: target indicates %d", resid); 906 } else { 907 io->io_received = ccb->csio.dxfer_len; 908 } 909 } 910 911 received = io->io_received; 912 iscsi_outstanding_remove(is, io); 913 ISCSI_SESSION_UNLOCK(is); 914 915 if (bhssr->bhssr_response != BHSSR_RESPONSE_COMMAND_COMPLETED) { 916 ISCSI_SESSION_WARN(is, "service response 0x%x", bhssr->bhssr_response); 917 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 918 xpt_freeze_devq(ccb->ccb_h.path, 1); 919 ISCSI_SESSION_DEBUG(is, "freezing devq"); 920 } 921 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN; 922 } else if (bhssr->bhssr_status == 0) { 923 ccb->ccb_h.status = CAM_REQ_CMP; 924 } else { 925 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 926 xpt_freeze_devq(ccb->ccb_h.path, 1); 927 ISCSI_SESSION_DEBUG(is, "freezing devq"); 928 } 929 ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR | CAM_DEV_QFRZN; 930 ccb->csio.scsi_status = bhssr->bhssr_status; 931 } 932 933 csio = &ccb->csio; 934 data_segment_len = icl_pdu_data_segment_length(response); 935 if (data_segment_len > 0) { 936 if (data_segment_len < sizeof(sense_len)) { 937 ISCSI_SESSION_WARN(is, "truncated data segment (%zd bytes)", 938 data_segment_len); 939 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 940 xpt_freeze_devq(ccb->ccb_h.path, 1); 941 ISCSI_SESSION_DEBUG(is, "freezing devq"); 942 } 943 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN; 944 goto out; 945 } 946 icl_pdu_get_data(response, 0, &sense_len, sizeof(sense_len)); 947 sense_len = ntohs(sense_len); 948 #if 0 949 ISCSI_SESSION_DEBUG(is, "sense_len %d, data len %zd", 950 sense_len, data_segment_len); 951 #endif 952 if (sizeof(sense_len) + sense_len > data_segment_len) { 953 ISCSI_SESSION_WARN(is, "truncated data segment " 954 "(%zd bytes, should be %zd)", 955 data_segment_len, sizeof(sense_len) + sense_len); 956 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 957 xpt_freeze_devq(ccb->ccb_h.path, 1); 958 ISCSI_SESSION_DEBUG(is, "freezing devq"); 959 } 960 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN; 961 goto out; 962 } else if (sizeof(sense_len) + sense_len < data_segment_len) 963 ISCSI_SESSION_WARN(is, "oversize data segment " 964 "(%zd bytes, should be %zd)", 965 data_segment_len, sizeof(sense_len) + sense_len); 966 if (sense_len > csio->sense_len) { 967 ISCSI_SESSION_DEBUG(is, "truncating sense from %d to %d", 968 sense_len, csio->sense_len); 969 sense_len = csio->sense_len; 970 } 971 icl_pdu_get_data(response, sizeof(sense_len), &csio->sense_data, sense_len); 972 csio->sense_resid = csio->sense_len - sense_len; 973 ccb->ccb_h.status |= CAM_AUTOSNS_VALID; 974 } 975 976 out: 977 if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_UNDERFLOW) 978 csio->resid = ntohl(bhssr->bhssr_residual_count); 979 980 if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) { 981 KASSERT(received <= csio->dxfer_len, 982 ("received > csio->dxfer_len")); 983 if (received < csio->dxfer_len) { 984 if (csio->resid != csio->dxfer_len - received) { 985 ISCSI_SESSION_WARN(is, "underflow mismatch: " 986 "target indicates %d, we calculated %zd", 987 csio->resid, csio->dxfer_len - received); 988 } 989 csio->resid = csio->dxfer_len - received; 990 } 991 } 992 993 xpt_done(ccb); 994 icl_pdu_free(response); 995 } 996 997 static void 998 iscsi_pdu_handle_task_response(struct icl_pdu *response) 999 { 1000 struct iscsi_bhs_task_management_response *bhstmr; 1001 struct iscsi_outstanding *io, *aio; 1002 struct iscsi_session *is; 1003 1004 is = PDU_SESSION(response); 1005 1006 bhstmr = (struct iscsi_bhs_task_management_response *)response->ip_bhs; 1007 io = iscsi_outstanding_find(is, bhstmr->bhstmr_initiator_task_tag); 1008 if (io == NULL || io->io_ccb != NULL) { 1009 ISCSI_SESSION_WARN(is, "bad itt 0x%x", 1010 bhstmr->bhstmr_initiator_task_tag); 1011 icl_pdu_free(response); 1012 iscsi_session_reconnect(is); 1013 return; 1014 } 1015 1016 if (bhstmr->bhstmr_response != BHSTMR_RESPONSE_FUNCTION_COMPLETE) { 1017 ISCSI_SESSION_WARN(is, "task response 0x%x", 1018 bhstmr->bhstmr_response); 1019 } else { 1020 aio = iscsi_outstanding_find(is, io->io_referenced_task_tag); 1021 if (aio != NULL && aio->io_ccb != NULL) 1022 iscsi_session_terminate_task(is, aio, CAM_REQ_ABORTED); 1023 } 1024 1025 iscsi_outstanding_remove(is, io); 1026 icl_pdu_free(response); 1027 } 1028 1029 static void 1030 iscsi_pdu_handle_data_in(struct icl_pdu *response) 1031 { 1032 struct iscsi_bhs_data_in *bhsdi; 1033 struct iscsi_outstanding *io; 1034 struct iscsi_session *is; 1035 union ccb *ccb; 1036 struct ccb_scsiio *csio; 1037 size_t data_segment_len, received, oreceived; 1038 1039 is = PDU_SESSION(response); 1040 bhsdi = (struct iscsi_bhs_data_in *)response->ip_bhs; 1041 io = iscsi_outstanding_find(is, bhsdi->bhsdi_initiator_task_tag); 1042 if (io == NULL || io->io_ccb == NULL) { 1043 ISCSI_SESSION_WARN(is, "bad itt 0x%x", bhsdi->bhsdi_initiator_task_tag); 1044 icl_pdu_free(response); 1045 iscsi_session_reconnect(is); 1046 ISCSI_SESSION_UNLOCK(is); 1047 return; 1048 } 1049 1050 data_segment_len = icl_pdu_data_segment_length(response); 1051 if (data_segment_len == 0) { 1052 /* 1053 * "The sending of 0 length data segments should be avoided, 1054 * but initiators and targets MUST be able to properly receive 1055 * 0 length data segments." 1056 */ 1057 ISCSI_SESSION_UNLOCK(is); 1058 icl_pdu_free(response); 1059 return; 1060 } 1061 1062 /* 1063 * We need to track this for security reasons - without it, malicious target 1064 * could respond to SCSI READ without sending Data-In PDUs, which would result 1065 * in read operation on the initiator side returning random kernel data. 1066 */ 1067 if (ntohl(bhsdi->bhsdi_buffer_offset) != io->io_received) { 1068 ISCSI_SESSION_WARN(is, "data out of order; expected offset %zd, got %zd", 1069 io->io_received, (size_t)ntohl(bhsdi->bhsdi_buffer_offset)); 1070 icl_pdu_free(response); 1071 iscsi_session_reconnect(is); 1072 ISCSI_SESSION_UNLOCK(is); 1073 return; 1074 } 1075 1076 ccb = io->io_ccb; 1077 csio = &ccb->csio; 1078 1079 if (io->io_received + data_segment_len > csio->dxfer_len) { 1080 ISCSI_SESSION_WARN(is, "oversize data segment (%zd bytes " 1081 "at offset %zd, buffer is %d)", 1082 data_segment_len, io->io_received, csio->dxfer_len); 1083 icl_pdu_free(response); 1084 iscsi_session_reconnect(is); 1085 ISCSI_SESSION_UNLOCK(is); 1086 return; 1087 } 1088 1089 oreceived = io->io_received; 1090 io->io_received += data_segment_len; 1091 received = io->io_received; 1092 if ((bhsdi->bhsdi_flags & BHSDI_FLAGS_S) != 0) 1093 iscsi_outstanding_remove(is, io); 1094 ISCSI_SESSION_UNLOCK(is); 1095 1096 icl_pdu_get_data(response, 0, csio->data_ptr + oreceived, data_segment_len); 1097 1098 /* 1099 * XXX: Check DataSN. 1100 * XXX: Check F. 1101 */ 1102 if ((bhsdi->bhsdi_flags & BHSDI_FLAGS_S) == 0) { 1103 /* 1104 * Nothing more to do. 1105 */ 1106 icl_pdu_free(response); 1107 return; 1108 } 1109 1110 //ISCSI_SESSION_DEBUG(is, "got S flag; status 0x%x", bhsdi->bhsdi_status); 1111 if (bhsdi->bhsdi_status == 0) { 1112 ccb->ccb_h.status = CAM_REQ_CMP; 1113 } else { 1114 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 1115 xpt_freeze_devq(ccb->ccb_h.path, 1); 1116 ISCSI_SESSION_DEBUG(is, "freezing devq"); 1117 } 1118 ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR | CAM_DEV_QFRZN; 1119 csio->scsi_status = bhsdi->bhsdi_status; 1120 } 1121 1122 if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) { 1123 KASSERT(received <= csio->dxfer_len, 1124 ("received > csio->dxfer_len")); 1125 if (received < csio->dxfer_len) { 1126 csio->resid = ntohl(bhsdi->bhsdi_residual_count); 1127 if (csio->resid != csio->dxfer_len - received) { 1128 ISCSI_SESSION_WARN(is, "underflow mismatch: " 1129 "target indicates %d, we calculated %zd", 1130 csio->resid, csio->dxfer_len - received); 1131 } 1132 csio->resid = csio->dxfer_len - received; 1133 } 1134 } 1135 1136 xpt_done(ccb); 1137 icl_pdu_free(response); 1138 } 1139 1140 static void 1141 iscsi_pdu_handle_logout_response(struct icl_pdu *response) 1142 { 1143 1144 ISCSI_SESSION_DEBUG(PDU_SESSION(response), "logout response"); 1145 icl_pdu_free(response); 1146 } 1147 1148 static void 1149 iscsi_pdu_handle_r2t(struct icl_pdu *response) 1150 { 1151 struct icl_pdu *request; 1152 struct iscsi_session *is; 1153 struct iscsi_bhs_r2t *bhsr2t; 1154 struct iscsi_bhs_data_out *bhsdo; 1155 struct iscsi_outstanding *io; 1156 struct ccb_scsiio *csio; 1157 size_t off, len, total_len; 1158 int error; 1159 uint32_t datasn = 0; 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 off = ntohl(bhsr2t->bhsr2t_buffer_offset); 1187 if (off > csio->dxfer_len) { 1188 ISCSI_SESSION_WARN(is, "target requested invalid offset " 1189 "%zd, buffer is is %d; reconnecting", off, csio->dxfer_len); 1190 icl_pdu_free(response); 1191 iscsi_session_reconnect(is); 1192 return; 1193 } 1194 1195 total_len = ntohl(bhsr2t->bhsr2t_desired_data_transfer_length); 1196 if (total_len == 0 || total_len > csio->dxfer_len) { 1197 ISCSI_SESSION_WARN(is, "target requested invalid length " 1198 "%zd, buffer is %d; reconnecting", total_len, csio->dxfer_len); 1199 icl_pdu_free(response); 1200 iscsi_session_reconnect(is); 1201 return; 1202 } 1203 1204 //ISCSI_SESSION_DEBUG(is, "r2t; off %zd, len %zd", off, total_len); 1205 1206 for (;;) { 1207 len = total_len; 1208 1209 if (len > is->is_max_send_data_segment_length) 1210 len = is->is_max_send_data_segment_length; 1211 1212 if (off + len > csio->dxfer_len) { 1213 ISCSI_SESSION_WARN(is, "target requested invalid " 1214 "length/offset %zd, buffer is %d; reconnecting", 1215 off + len, csio->dxfer_len); 1216 icl_pdu_free(response); 1217 iscsi_session_reconnect(is); 1218 return; 1219 } 1220 1221 request = icl_pdu_new(response->ip_conn, M_NOWAIT); 1222 if (request == NULL) { 1223 icl_pdu_free(response); 1224 iscsi_session_reconnect(is); 1225 return; 1226 } 1227 1228 bhsdo = (struct iscsi_bhs_data_out *)request->ip_bhs; 1229 bhsdo->bhsdo_opcode = ISCSI_BHS_OPCODE_SCSI_DATA_OUT; 1230 bhsdo->bhsdo_lun = bhsr2t->bhsr2t_lun; 1231 bhsdo->bhsdo_initiator_task_tag = 1232 bhsr2t->bhsr2t_initiator_task_tag; 1233 bhsdo->bhsdo_target_transfer_tag = 1234 bhsr2t->bhsr2t_target_transfer_tag; 1235 bhsdo->bhsdo_datasn = htonl(datasn++); 1236 bhsdo->bhsdo_buffer_offset = htonl(off); 1237 error = icl_pdu_append_data(request, csio->data_ptr + off, len, 1238 M_NOWAIT); 1239 if (error != 0) { 1240 ISCSI_SESSION_WARN(is, "failed to allocate memory; " 1241 "reconnecting"); 1242 icl_pdu_free(request); 1243 icl_pdu_free(response); 1244 iscsi_session_reconnect(is); 1245 return; 1246 } 1247 1248 off += len; 1249 total_len -= len; 1250 1251 if (total_len == 0) { 1252 bhsdo->bhsdo_flags |= BHSDO_FLAGS_F; 1253 //ISCSI_SESSION_DEBUG(is, "setting F, off %zd", off); 1254 } else { 1255 //ISCSI_SESSION_DEBUG(is, "not finished, off %zd", off); 1256 } 1257 1258 iscsi_pdu_queue_locked(request); 1259 1260 if (total_len == 0) 1261 break; 1262 } 1263 1264 icl_pdu_free(response); 1265 } 1266 1267 static void 1268 iscsi_pdu_handle_async_message(struct icl_pdu *response) 1269 { 1270 struct iscsi_bhs_asynchronous_message *bhsam; 1271 struct iscsi_session *is; 1272 1273 is = PDU_SESSION(response); 1274 bhsam = (struct iscsi_bhs_asynchronous_message *)response->ip_bhs; 1275 switch (bhsam->bhsam_async_event) { 1276 case BHSAM_EVENT_TARGET_REQUESTS_LOGOUT: 1277 ISCSI_SESSION_WARN(is, "target requests logout; removing session"); 1278 iscsi_session_logout(is); 1279 iscsi_session_terminate(is); 1280 break; 1281 case BHSAM_EVENT_TARGET_TERMINATES_CONNECTION: 1282 ISCSI_SESSION_WARN(is, "target indicates it will drop the connection"); 1283 break; 1284 case BHSAM_EVENT_TARGET_TERMINATES_SESSION: 1285 ISCSI_SESSION_WARN(is, "target indicates it will drop the session"); 1286 break; 1287 default: 1288 /* 1289 * XXX: Technically, we're obligated to also handle 1290 * parameter renegotiation. 1291 */ 1292 ISCSI_SESSION_WARN(is, "ignoring AsyncEvent %d", bhsam->bhsam_async_event); 1293 break; 1294 } 1295 1296 icl_pdu_free(response); 1297 } 1298 1299 static void 1300 iscsi_pdu_handle_reject(struct icl_pdu *response) 1301 { 1302 struct iscsi_bhs_reject *bhsr; 1303 struct iscsi_session *is; 1304 1305 is = PDU_SESSION(response); 1306 bhsr = (struct iscsi_bhs_reject *)response->ip_bhs; 1307 ISCSI_SESSION_WARN(is, "received Reject PDU, reason 0x%x; protocol error?", 1308 bhsr->bhsr_reason); 1309 1310 icl_pdu_free(response); 1311 } 1312 1313 static int 1314 iscsi_ioctl_daemon_wait(struct iscsi_softc *sc, 1315 struct iscsi_daemon_request *request) 1316 { 1317 struct iscsi_session *is; 1318 struct icl_drv_limits idl; 1319 int error; 1320 1321 sx_slock(&sc->sc_lock); 1322 for (;;) { 1323 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1324 ISCSI_SESSION_LOCK(is); 1325 if (is->is_conf.isc_enable == 0 && 1326 is->is_conf.isc_discovery == 0) { 1327 ISCSI_SESSION_UNLOCK(is); 1328 continue; 1329 } 1330 if (is->is_waiting_for_iscsid) 1331 break; 1332 ISCSI_SESSION_UNLOCK(is); 1333 } 1334 1335 if (is == NULL) { 1336 /* 1337 * No session requires attention from iscsid(8); wait. 1338 */ 1339 error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock); 1340 if (error != 0) { 1341 sx_sunlock(&sc->sc_lock); 1342 return (error); 1343 } 1344 continue; 1345 } 1346 1347 is->is_waiting_for_iscsid = false; 1348 is->is_login_phase = true; 1349 is->is_reason[0] = '\0'; 1350 ISCSI_SESSION_UNLOCK(is); 1351 1352 request->idr_session_id = is->is_id; 1353 memcpy(&request->idr_isid, &is->is_isid, 1354 sizeof(request->idr_isid)); 1355 request->idr_tsih = 0; /* New or reinstated session. */ 1356 memcpy(&request->idr_conf, &is->is_conf, 1357 sizeof(request->idr_conf)); 1358 1359 error = icl_limits(is->is_conf.isc_offload, 1360 is->is_conf.isc_iser, &idl); 1361 if (error != 0) { 1362 ISCSI_SESSION_WARN(is, "icl_limits for offload \"%s\" " 1363 "failed with error %d", is->is_conf.isc_offload, 1364 error); 1365 sx_sunlock(&sc->sc_lock); 1366 return (error); 1367 } 1368 request->idr_limits.isl_max_recv_data_segment_length = 1369 idl.idl_max_recv_data_segment_length; 1370 request->idr_limits.isl_max_send_data_segment_length = 1371 idl.idl_max_send_data_segment_length; 1372 request->idr_limits.isl_max_burst_length = 1373 idl.idl_max_burst_length; 1374 request->idr_limits.isl_first_burst_length = 1375 idl.idl_first_burst_length; 1376 1377 sx_sunlock(&sc->sc_lock); 1378 return (0); 1379 } 1380 } 1381 1382 static int 1383 iscsi_ioctl_daemon_handoff(struct iscsi_softc *sc, 1384 struct iscsi_daemon_handoff *handoff) 1385 { 1386 struct iscsi_session *is; 1387 struct icl_conn *ic; 1388 int error; 1389 1390 sx_slock(&sc->sc_lock); 1391 1392 /* 1393 * Find the session to hand off socket to. 1394 */ 1395 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1396 if (is->is_id == handoff->idh_session_id) 1397 break; 1398 } 1399 if (is == NULL) { 1400 sx_sunlock(&sc->sc_lock); 1401 return (ESRCH); 1402 } 1403 ISCSI_SESSION_LOCK(is); 1404 ic = is->is_conn; 1405 if (is->is_conf.isc_discovery || is->is_terminating) { 1406 ISCSI_SESSION_UNLOCK(is); 1407 sx_sunlock(&sc->sc_lock); 1408 return (EINVAL); 1409 } 1410 if (is->is_connected) { 1411 /* 1412 * This might have happened because another iscsid(8) 1413 * instance handed off the connection in the meantime. 1414 * Just return. 1415 */ 1416 ISCSI_SESSION_WARN(is, "handoff on already connected " 1417 "session"); 1418 ISCSI_SESSION_UNLOCK(is); 1419 sx_sunlock(&sc->sc_lock); 1420 return (EBUSY); 1421 } 1422 1423 strlcpy(is->is_target_alias, handoff->idh_target_alias, 1424 sizeof(is->is_target_alias)); 1425 is->is_tsih = handoff->idh_tsih; 1426 is->is_statsn = handoff->idh_statsn; 1427 is->is_protocol_level = handoff->idh_protocol_level; 1428 is->is_initial_r2t = handoff->idh_initial_r2t; 1429 is->is_immediate_data = handoff->idh_immediate_data; 1430 1431 is->is_max_recv_data_segment_length = 1432 handoff->idh_max_recv_data_segment_length; 1433 is->is_max_send_data_segment_length = 1434 handoff->idh_max_send_data_segment_length; 1435 is->is_max_burst_length = handoff->idh_max_burst_length; 1436 is->is_first_burst_length = handoff->idh_first_burst_length; 1437 1438 if (handoff->idh_header_digest == ISCSI_DIGEST_CRC32C) 1439 ic->ic_header_crc32c = true; 1440 else 1441 ic->ic_header_crc32c = false; 1442 if (handoff->idh_data_digest == ISCSI_DIGEST_CRC32C) 1443 ic->ic_data_crc32c = true; 1444 else 1445 ic->ic_data_crc32c = false; 1446 ic->ic_maxtags = maxtags; 1447 1448 is->is_cmdsn = 0; 1449 is->is_expcmdsn = 0; 1450 is->is_maxcmdsn = 0; 1451 is->is_waiting_for_iscsid = false; 1452 is->is_login_phase = false; 1453 is->is_timeout = 0; 1454 is->is_connected = true; 1455 is->is_reason[0] = '\0'; 1456 1457 ISCSI_SESSION_UNLOCK(is); 1458 1459 /* 1460 * If we're going through the proxy, the idh_socket will be 0, 1461 * and the ICL module can simply ignore this call. It can also 1462 * use it to determine it's no longer in the Login phase. 1463 */ 1464 error = icl_conn_handoff(ic, handoff->idh_socket); 1465 if (error != 0) { 1466 sx_sunlock(&sc->sc_lock); 1467 iscsi_session_terminate(is); 1468 return (error); 1469 } 1470 1471 sx_sunlock(&sc->sc_lock); 1472 1473 if (is->is_sim != NULL) { 1474 /* 1475 * When reconnecting, there already is SIM allocated for the session. 1476 */ 1477 KASSERT(is->is_simq_frozen, ("reconnect without frozen simq")); 1478 ISCSI_SESSION_LOCK(is); 1479 ISCSI_SESSION_DEBUG(is, "releasing"); 1480 is->is_simq_frozen = false; 1481 xpt_release_simq(is->is_sim, 1); 1482 ISCSI_SESSION_UNLOCK(is); 1483 1484 } else { 1485 ISCSI_SESSION_LOCK(is); 1486 is->is_devq = cam_simq_alloc(ic->ic_maxtags); 1487 if (is->is_devq == NULL) { 1488 ISCSI_SESSION_WARN(is, "failed to allocate simq"); 1489 iscsi_session_terminate(is); 1490 return (ENOMEM); 1491 } 1492 1493 is->is_sim = cam_sim_alloc(iscsi_action, NULL, "iscsi", 1494 is, is->is_id /* unit */, &is->is_lock, 1495 1, ic->ic_maxtags, is->is_devq); 1496 if (is->is_sim == NULL) { 1497 ISCSI_SESSION_UNLOCK(is); 1498 ISCSI_SESSION_WARN(is, "failed to allocate SIM"); 1499 cam_simq_free(is->is_devq); 1500 iscsi_session_terminate(is); 1501 return (ENOMEM); 1502 } 1503 1504 error = xpt_bus_register(is->is_sim, NULL, 0); 1505 if (error != 0) { 1506 ISCSI_SESSION_UNLOCK(is); 1507 ISCSI_SESSION_WARN(is, "failed to register bus"); 1508 iscsi_session_terminate(is); 1509 return (ENOMEM); 1510 } 1511 1512 error = xpt_create_path(&is->is_path, /*periph*/NULL, 1513 cam_sim_path(is->is_sim), CAM_TARGET_WILDCARD, 1514 CAM_LUN_WILDCARD); 1515 if (error != CAM_REQ_CMP) { 1516 ISCSI_SESSION_UNLOCK(is); 1517 ISCSI_SESSION_WARN(is, "failed to create path"); 1518 iscsi_session_terminate(is); 1519 return (ENOMEM); 1520 } 1521 ISCSI_SESSION_UNLOCK(is); 1522 } 1523 1524 return (0); 1525 } 1526 1527 static int 1528 iscsi_ioctl_daemon_fail(struct iscsi_softc *sc, 1529 struct iscsi_daemon_fail *fail) 1530 { 1531 struct iscsi_session *is; 1532 1533 sx_slock(&sc->sc_lock); 1534 1535 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1536 if (is->is_id == fail->idf_session_id) 1537 break; 1538 } 1539 if (is == NULL) { 1540 sx_sunlock(&sc->sc_lock); 1541 return (ESRCH); 1542 } 1543 ISCSI_SESSION_LOCK(is); 1544 ISCSI_SESSION_DEBUG(is, "iscsid(8) failed: %s", 1545 fail->idf_reason); 1546 strlcpy(is->is_reason, fail->idf_reason, sizeof(is->is_reason)); 1547 //is->is_waiting_for_iscsid = false; 1548 //is->is_login_phase = true; 1549 //iscsi_session_reconnect(is); 1550 ISCSI_SESSION_UNLOCK(is); 1551 sx_sunlock(&sc->sc_lock); 1552 1553 return (0); 1554 } 1555 1556 #ifdef ICL_KERNEL_PROXY 1557 static int 1558 iscsi_ioctl_daemon_connect(struct iscsi_softc *sc, 1559 struct iscsi_daemon_connect *idc) 1560 { 1561 struct iscsi_session *is; 1562 struct sockaddr *from_sa, *to_sa; 1563 int error; 1564 1565 sx_slock(&sc->sc_lock); 1566 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1567 if (is->is_id == idc->idc_session_id) 1568 break; 1569 } 1570 if (is == NULL) { 1571 sx_sunlock(&sc->sc_lock); 1572 return (ESRCH); 1573 } 1574 sx_sunlock(&sc->sc_lock); 1575 1576 if (idc->idc_from_addrlen > 0) { 1577 error = getsockaddr(&from_sa, (void *)idc->idc_from_addr, idc->idc_from_addrlen); 1578 if (error != 0) { 1579 ISCSI_SESSION_WARN(is, 1580 "getsockaddr failed with error %d", error); 1581 return (error); 1582 } 1583 } else { 1584 from_sa = NULL; 1585 } 1586 error = getsockaddr(&to_sa, (void *)idc->idc_to_addr, idc->idc_to_addrlen); 1587 if (error != 0) { 1588 ISCSI_SESSION_WARN(is, "getsockaddr failed with error %d", 1589 error); 1590 free(from_sa, M_SONAME); 1591 return (error); 1592 } 1593 1594 ISCSI_SESSION_LOCK(is); 1595 is->is_statsn = 0; 1596 is->is_cmdsn = 0; 1597 is->is_expcmdsn = 0; 1598 is->is_maxcmdsn = 0; 1599 is->is_waiting_for_iscsid = false; 1600 is->is_login_phase = true; 1601 is->is_timeout = 0; 1602 ISCSI_SESSION_UNLOCK(is); 1603 1604 error = icl_conn_connect(is->is_conn, idc->idc_domain, 1605 idc->idc_socktype, idc->idc_protocol, from_sa, to_sa); 1606 free(from_sa, M_SONAME); 1607 free(to_sa, M_SONAME); 1608 1609 /* 1610 * Digests are always disabled during login phase. 1611 */ 1612 is->is_conn->ic_header_crc32c = false; 1613 is->is_conn->ic_data_crc32c = false; 1614 1615 return (error); 1616 } 1617 1618 static int 1619 iscsi_ioctl_daemon_send(struct iscsi_softc *sc, 1620 struct iscsi_daemon_send *ids) 1621 { 1622 struct iscsi_session *is; 1623 struct icl_pdu *ip; 1624 size_t datalen; 1625 void *data; 1626 int error; 1627 1628 sx_slock(&sc->sc_lock); 1629 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1630 if (is->is_id == ids->ids_session_id) 1631 break; 1632 } 1633 if (is == NULL) { 1634 sx_sunlock(&sc->sc_lock); 1635 return (ESRCH); 1636 } 1637 sx_sunlock(&sc->sc_lock); 1638 1639 if (is->is_login_phase == false) 1640 return (EBUSY); 1641 1642 if (is->is_terminating || is->is_reconnecting) 1643 return (EIO); 1644 1645 datalen = ids->ids_data_segment_len; 1646 if (datalen > is->is_max_send_data_segment_length) 1647 return (EINVAL); 1648 if (datalen > 0) { 1649 data = malloc(datalen, M_ISCSI, M_WAITOK); 1650 error = copyin(ids->ids_data_segment, data, datalen); 1651 if (error != 0) { 1652 free(data, M_ISCSI); 1653 return (error); 1654 } 1655 } 1656 1657 ip = icl_pdu_new(is->is_conn, M_WAITOK); 1658 memcpy(ip->ip_bhs, ids->ids_bhs, sizeof(*ip->ip_bhs)); 1659 if (datalen > 0) { 1660 error = icl_pdu_append_data(ip, data, datalen, M_WAITOK); 1661 KASSERT(error == 0, ("icl_pdu_append_data(..., M_WAITOK) failed")); 1662 free(data, M_ISCSI); 1663 } 1664 iscsi_pdu_queue(ip); 1665 1666 return (0); 1667 } 1668 1669 static int 1670 iscsi_ioctl_daemon_receive(struct iscsi_softc *sc, 1671 struct iscsi_daemon_receive *idr) 1672 { 1673 struct iscsi_session *is; 1674 struct icl_pdu *ip; 1675 void *data; 1676 int error; 1677 1678 sx_slock(&sc->sc_lock); 1679 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1680 if (is->is_id == idr->idr_session_id) 1681 break; 1682 } 1683 if (is == NULL) { 1684 sx_sunlock(&sc->sc_lock); 1685 return (ESRCH); 1686 } 1687 sx_sunlock(&sc->sc_lock); 1688 1689 if (is->is_login_phase == false) 1690 return (EBUSY); 1691 1692 ISCSI_SESSION_LOCK(is); 1693 while (is->is_login_pdu == NULL && 1694 is->is_terminating == false && 1695 is->is_reconnecting == false) { 1696 error = cv_wait_sig(&is->is_login_cv, &is->is_lock); 1697 if (error != 0) { 1698 ISCSI_SESSION_UNLOCK(is); 1699 return (error); 1700 } 1701 } 1702 if (is->is_terminating || is->is_reconnecting) { 1703 ISCSI_SESSION_UNLOCK(is); 1704 return (EIO); 1705 } 1706 ip = is->is_login_pdu; 1707 is->is_login_pdu = NULL; 1708 ISCSI_SESSION_UNLOCK(is); 1709 1710 if (ip->ip_data_len > idr->idr_data_segment_len) { 1711 icl_pdu_free(ip); 1712 return (EMSGSIZE); 1713 } 1714 1715 copyout(ip->ip_bhs, idr->idr_bhs, sizeof(*ip->ip_bhs)); 1716 if (ip->ip_data_len > 0) { 1717 data = malloc(ip->ip_data_len, M_ISCSI, M_WAITOK); 1718 icl_pdu_get_data(ip, 0, data, ip->ip_data_len); 1719 copyout(data, idr->idr_data_segment, ip->ip_data_len); 1720 free(data, M_ISCSI); 1721 } 1722 1723 icl_pdu_free(ip); 1724 1725 return (0); 1726 } 1727 #endif /* ICL_KERNEL_PROXY */ 1728 1729 static void 1730 iscsi_sanitize_session_conf(struct iscsi_session_conf *isc) 1731 { 1732 /* 1733 * Just make sure all the fields are null-terminated. 1734 * 1735 * XXX: This is not particularly secure. We should 1736 * create our own conf and then copy in relevant 1737 * fields. 1738 */ 1739 isc->isc_initiator[ISCSI_NAME_LEN - 1] = '\0'; 1740 isc->isc_initiator_addr[ISCSI_ADDR_LEN - 1] = '\0'; 1741 isc->isc_initiator_alias[ISCSI_ALIAS_LEN - 1] = '\0'; 1742 isc->isc_target[ISCSI_NAME_LEN - 1] = '\0'; 1743 isc->isc_target_addr[ISCSI_ADDR_LEN - 1] = '\0'; 1744 isc->isc_user[ISCSI_NAME_LEN - 1] = '\0'; 1745 isc->isc_secret[ISCSI_SECRET_LEN - 1] = '\0'; 1746 isc->isc_mutual_user[ISCSI_NAME_LEN - 1] = '\0'; 1747 isc->isc_mutual_secret[ISCSI_SECRET_LEN - 1] = '\0'; 1748 } 1749 1750 static bool 1751 iscsi_valid_session_conf(const struct iscsi_session_conf *isc) 1752 { 1753 1754 if (isc->isc_initiator[0] == '\0') { 1755 ISCSI_DEBUG("empty isc_initiator"); 1756 return (false); 1757 } 1758 1759 if (isc->isc_target_addr[0] == '\0') { 1760 ISCSI_DEBUG("empty isc_target_addr"); 1761 return (false); 1762 } 1763 1764 if (isc->isc_discovery != 0 && isc->isc_target[0] != 0) { 1765 ISCSI_DEBUG("non-empty isc_target for discovery session"); 1766 return (false); 1767 } 1768 1769 if (isc->isc_discovery == 0 && isc->isc_target[0] == 0) { 1770 ISCSI_DEBUG("empty isc_target for non-discovery session"); 1771 return (false); 1772 } 1773 1774 return (true); 1775 } 1776 1777 static int 1778 iscsi_ioctl_session_add(struct iscsi_softc *sc, struct iscsi_session_add *isa) 1779 { 1780 struct iscsi_session *is; 1781 const struct iscsi_session *is2; 1782 int error; 1783 1784 iscsi_sanitize_session_conf(&isa->isa_conf); 1785 if (iscsi_valid_session_conf(&isa->isa_conf) == false) 1786 return (EINVAL); 1787 1788 is = malloc(sizeof(*is), M_ISCSI, M_ZERO | M_WAITOK); 1789 memcpy(&is->is_conf, &isa->isa_conf, sizeof(is->is_conf)); 1790 1791 /* 1792 * Set some default values, from RFC 3720, section 12. 1793 * 1794 * These values are updated by the handoff IOCTL, but are 1795 * needed prior to the handoff to support sending the ISER 1796 * login PDU. 1797 */ 1798 is->is_max_recv_data_segment_length = 8192; 1799 is->is_max_send_data_segment_length = 8192; 1800 is->is_max_burst_length = 262144; 1801 is->is_first_burst_length = 65536; 1802 1803 sx_xlock(&sc->sc_lock); 1804 1805 /* 1806 * Prevent duplicates. 1807 */ 1808 TAILQ_FOREACH(is2, &sc->sc_sessions, is_next) { 1809 if (!!is->is_conf.isc_discovery != 1810 !!is2->is_conf.isc_discovery) 1811 continue; 1812 1813 if (strcmp(is->is_conf.isc_target_addr, 1814 is2->is_conf.isc_target_addr) != 0) 1815 continue; 1816 1817 if (is->is_conf.isc_discovery == 0 && 1818 strcmp(is->is_conf.isc_target, 1819 is2->is_conf.isc_target) != 0) 1820 continue; 1821 1822 sx_xunlock(&sc->sc_lock); 1823 free(is, M_ISCSI); 1824 return (EBUSY); 1825 } 1826 1827 is->is_conn = icl_new_conn(is->is_conf.isc_offload, 1828 is->is_conf.isc_iser, "iscsi", &is->is_lock); 1829 if (is->is_conn == NULL) { 1830 sx_xunlock(&sc->sc_lock); 1831 free(is, M_ISCSI); 1832 return (EINVAL); 1833 } 1834 is->is_conn->ic_receive = iscsi_receive_callback; 1835 is->is_conn->ic_error = iscsi_error_callback; 1836 is->is_conn->ic_prv0 = is; 1837 TAILQ_INIT(&is->is_outstanding); 1838 STAILQ_INIT(&is->is_postponed); 1839 mtx_init(&is->is_lock, "iscsi_lock", NULL, MTX_DEF); 1840 cv_init(&is->is_maintenance_cv, "iscsi_mt"); 1841 #ifdef ICL_KERNEL_PROXY 1842 cv_init(&is->is_login_cv, "iscsi_login"); 1843 #endif 1844 1845 is->is_softc = sc; 1846 sc->sc_last_session_id++; 1847 is->is_id = sc->sc_last_session_id; 1848 is->is_isid[0] = 0x80; /* RFC 3720, 10.12.5: 10b, "Random" ISID. */ 1849 arc4rand(&is->is_isid[1], 5, 0); 1850 is->is_tsih = 0; 1851 callout_init(&is->is_callout, 1); 1852 1853 error = kthread_add(iscsi_maintenance_thread, is, NULL, NULL, 0, 0, "iscsimt"); 1854 if (error != 0) { 1855 ISCSI_SESSION_WARN(is, "kthread_add(9) failed with error %d", error); 1856 sx_xunlock(&sc->sc_lock); 1857 return (error); 1858 } 1859 1860 callout_reset(&is->is_callout, 1 * hz, iscsi_callout, is); 1861 TAILQ_INSERT_TAIL(&sc->sc_sessions, is, is_next); 1862 1863 ISCSI_SESSION_LOCK(is); 1864 /* 1865 * Don't notify iscsid(8) if the session is disabled and it's not 1866 * a discovery session, 1867 */ 1868 if (is->is_conf.isc_enable == 0 && is->is_conf.isc_discovery == 0) { 1869 ISCSI_SESSION_UNLOCK(is); 1870 sx_xunlock(&sc->sc_lock); 1871 return (0); 1872 } 1873 1874 is->is_waiting_for_iscsid = true; 1875 strlcpy(is->is_reason, "Waiting for iscsid(8)", sizeof(is->is_reason)); 1876 ISCSI_SESSION_UNLOCK(is); 1877 cv_signal(&sc->sc_cv); 1878 sx_xunlock(&sc->sc_lock); 1879 return (0); 1880 } 1881 1882 static bool 1883 iscsi_session_conf_matches(unsigned int id1, const struct iscsi_session_conf *c1, 1884 unsigned int id2, const struct iscsi_session_conf *c2) 1885 { 1886 1887 if (id2 != 0 && id2 != id1) 1888 return (false); 1889 if (c2->isc_target[0] != '\0' && 1890 strcmp(c1->isc_target, c2->isc_target) != 0) 1891 return (false); 1892 if (c2->isc_target_addr[0] != '\0' && 1893 strcmp(c1->isc_target_addr, c2->isc_target_addr) != 0) 1894 return (false); 1895 return (true); 1896 } 1897 1898 static int 1899 iscsi_ioctl_session_remove(struct iscsi_softc *sc, 1900 struct iscsi_session_remove *isr) 1901 { 1902 struct iscsi_session *is, *tmp; 1903 bool found = false; 1904 1905 iscsi_sanitize_session_conf(&isr->isr_conf); 1906 1907 sx_xlock(&sc->sc_lock); 1908 TAILQ_FOREACH_SAFE(is, &sc->sc_sessions, is_next, tmp) { 1909 ISCSI_SESSION_LOCK(is); 1910 if (iscsi_session_conf_matches(is->is_id, &is->is_conf, 1911 isr->isr_session_id, &isr->isr_conf)) { 1912 found = true; 1913 iscsi_session_logout(is); 1914 iscsi_session_terminate(is); 1915 } 1916 ISCSI_SESSION_UNLOCK(is); 1917 } 1918 sx_xunlock(&sc->sc_lock); 1919 1920 if (!found) 1921 return (ESRCH); 1922 1923 return (0); 1924 } 1925 1926 static int 1927 iscsi_ioctl_session_list(struct iscsi_softc *sc, struct iscsi_session_list *isl) 1928 { 1929 int error; 1930 unsigned int i = 0; 1931 struct iscsi_session *is; 1932 struct iscsi_session_state iss; 1933 1934 sx_slock(&sc->sc_lock); 1935 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1936 if (i >= isl->isl_nentries) { 1937 sx_sunlock(&sc->sc_lock); 1938 return (EMSGSIZE); 1939 } 1940 memset(&iss, 0, sizeof(iss)); 1941 memcpy(&iss.iss_conf, &is->is_conf, sizeof(iss.iss_conf)); 1942 iss.iss_id = is->is_id; 1943 strlcpy(iss.iss_target_alias, is->is_target_alias, sizeof(iss.iss_target_alias)); 1944 strlcpy(iss.iss_reason, is->is_reason, sizeof(iss.iss_reason)); 1945 strlcpy(iss.iss_offload, is->is_conn->ic_offload, sizeof(iss.iss_offload)); 1946 1947 if (is->is_conn->ic_header_crc32c) 1948 iss.iss_header_digest = ISCSI_DIGEST_CRC32C; 1949 else 1950 iss.iss_header_digest = ISCSI_DIGEST_NONE; 1951 1952 if (is->is_conn->ic_data_crc32c) 1953 iss.iss_data_digest = ISCSI_DIGEST_CRC32C; 1954 else 1955 iss.iss_data_digest = ISCSI_DIGEST_NONE; 1956 1957 iss.iss_max_send_data_segment_length = 1958 is->is_max_send_data_segment_length; 1959 iss.iss_max_recv_data_segment_length = 1960 is->is_max_recv_data_segment_length; 1961 iss.iss_max_burst_length = is->is_max_burst_length; 1962 iss.iss_first_burst_length = is->is_first_burst_length; 1963 iss.iss_immediate_data = is->is_immediate_data; 1964 iss.iss_connected = is->is_connected; 1965 1966 error = copyout(&iss, isl->isl_pstates + i, sizeof(iss)); 1967 if (error != 0) { 1968 sx_sunlock(&sc->sc_lock); 1969 return (error); 1970 } 1971 i++; 1972 } 1973 sx_sunlock(&sc->sc_lock); 1974 1975 isl->isl_nentries = i; 1976 1977 return (0); 1978 } 1979 1980 static int 1981 iscsi_ioctl_session_modify(struct iscsi_softc *sc, 1982 struct iscsi_session_modify *ism) 1983 { 1984 struct iscsi_session *is; 1985 const struct iscsi_session *is2; 1986 1987 iscsi_sanitize_session_conf(&ism->ism_conf); 1988 if (iscsi_valid_session_conf(&ism->ism_conf) == false) 1989 return (EINVAL); 1990 1991 sx_xlock(&sc->sc_lock); 1992 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1993 ISCSI_SESSION_LOCK(is); 1994 if (is->is_id == ism->ism_session_id) { 1995 /* Note that the session remains locked. */ 1996 break; 1997 } 1998 ISCSI_SESSION_UNLOCK(is); 1999 } 2000 if (is == NULL) { 2001 sx_xunlock(&sc->sc_lock); 2002 return (ESRCH); 2003 } 2004 2005 /* 2006 * Prevent duplicates. 2007 */ 2008 TAILQ_FOREACH(is2, &sc->sc_sessions, is_next) { 2009 if (is == is2) 2010 continue; 2011 2012 if (!!ism->ism_conf.isc_discovery != 2013 !!is2->is_conf.isc_discovery) 2014 continue; 2015 2016 if (strcmp(ism->ism_conf.isc_target_addr, 2017 is2->is_conf.isc_target_addr) != 0) 2018 continue; 2019 2020 if (ism->ism_conf.isc_discovery == 0 && 2021 strcmp(ism->ism_conf.isc_target, 2022 is2->is_conf.isc_target) != 0) 2023 continue; 2024 2025 ISCSI_SESSION_UNLOCK(is); 2026 sx_xunlock(&sc->sc_lock); 2027 return (EBUSY); 2028 } 2029 2030 sx_xunlock(&sc->sc_lock); 2031 2032 memcpy(&is->is_conf, &ism->ism_conf, sizeof(is->is_conf)); 2033 ISCSI_SESSION_UNLOCK(is); 2034 2035 iscsi_session_reconnect(is); 2036 2037 return (0); 2038 } 2039 2040 static int 2041 iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, int mode, 2042 struct thread *td) 2043 { 2044 struct iscsi_softc *sc; 2045 2046 sc = dev->si_drv1; 2047 2048 switch (cmd) { 2049 case ISCSIDWAIT: 2050 return (iscsi_ioctl_daemon_wait(sc, 2051 (struct iscsi_daemon_request *)arg)); 2052 case ISCSIDHANDOFF: 2053 return (iscsi_ioctl_daemon_handoff(sc, 2054 (struct iscsi_daemon_handoff *)arg)); 2055 case ISCSIDFAIL: 2056 return (iscsi_ioctl_daemon_fail(sc, 2057 (struct iscsi_daemon_fail *)arg)); 2058 #ifdef ICL_KERNEL_PROXY 2059 case ISCSIDCONNECT: 2060 return (iscsi_ioctl_daemon_connect(sc, 2061 (struct iscsi_daemon_connect *)arg)); 2062 case ISCSIDSEND: 2063 return (iscsi_ioctl_daemon_send(sc, 2064 (struct iscsi_daemon_send *)arg)); 2065 case ISCSIDRECEIVE: 2066 return (iscsi_ioctl_daemon_receive(sc, 2067 (struct iscsi_daemon_receive *)arg)); 2068 #endif /* ICL_KERNEL_PROXY */ 2069 case ISCSISADD: 2070 return (iscsi_ioctl_session_add(sc, 2071 (struct iscsi_session_add *)arg)); 2072 case ISCSISREMOVE: 2073 return (iscsi_ioctl_session_remove(sc, 2074 (struct iscsi_session_remove *)arg)); 2075 case ISCSISLIST: 2076 return (iscsi_ioctl_session_list(sc, 2077 (struct iscsi_session_list *)arg)); 2078 case ISCSISMODIFY: 2079 return (iscsi_ioctl_session_modify(sc, 2080 (struct iscsi_session_modify *)arg)); 2081 default: 2082 return (EINVAL); 2083 } 2084 } 2085 2086 static struct iscsi_outstanding * 2087 iscsi_outstanding_find(struct iscsi_session *is, uint32_t initiator_task_tag) 2088 { 2089 struct iscsi_outstanding *io; 2090 2091 ISCSI_SESSION_LOCK_ASSERT(is); 2092 2093 TAILQ_FOREACH(io, &is->is_outstanding, io_next) { 2094 if (io->io_initiator_task_tag == initiator_task_tag) 2095 return (io); 2096 } 2097 return (NULL); 2098 } 2099 2100 static struct iscsi_outstanding * 2101 iscsi_outstanding_find_ccb(struct iscsi_session *is, union ccb *ccb) 2102 { 2103 struct iscsi_outstanding *io; 2104 2105 ISCSI_SESSION_LOCK_ASSERT(is); 2106 2107 TAILQ_FOREACH(io, &is->is_outstanding, io_next) { 2108 if (io->io_ccb == ccb) 2109 return (io); 2110 } 2111 return (NULL); 2112 } 2113 2114 static struct iscsi_outstanding * 2115 iscsi_outstanding_add(struct iscsi_session *is, struct icl_pdu *request, 2116 union ccb *ccb, uint32_t *initiator_task_tagp) 2117 { 2118 struct iscsi_outstanding *io; 2119 int error; 2120 2121 ISCSI_SESSION_LOCK_ASSERT(is); 2122 2123 io = uma_zalloc(iscsi_outstanding_zone, M_NOWAIT | M_ZERO); 2124 if (io == NULL) { 2125 ISCSI_SESSION_WARN(is, "failed to allocate %zd bytes", 2126 sizeof(*io)); 2127 return (NULL); 2128 } 2129 2130 error = icl_conn_task_setup(is->is_conn, request, &ccb->csio, 2131 initiator_task_tagp, &io->io_icl_prv); 2132 if (error != 0) { 2133 ISCSI_SESSION_WARN(is, 2134 "icl_conn_task_setup() failed with error %d", error); 2135 uma_zfree(iscsi_outstanding_zone, io); 2136 return (NULL); 2137 } 2138 2139 KASSERT(iscsi_outstanding_find(is, *initiator_task_tagp) == NULL, 2140 ("initiator_task_tag 0x%x already added", *initiator_task_tagp)); 2141 2142 io->io_initiator_task_tag = *initiator_task_tagp; 2143 io->io_ccb = ccb; 2144 TAILQ_INSERT_TAIL(&is->is_outstanding, io, io_next); 2145 return (io); 2146 } 2147 2148 static void 2149 iscsi_outstanding_remove(struct iscsi_session *is, struct iscsi_outstanding *io) 2150 { 2151 2152 ISCSI_SESSION_LOCK_ASSERT(is); 2153 2154 icl_conn_task_done(is->is_conn, io->io_icl_prv); 2155 TAILQ_REMOVE(&is->is_outstanding, io, io_next); 2156 uma_zfree(iscsi_outstanding_zone, io); 2157 } 2158 2159 static void 2160 iscsi_action_abort(struct iscsi_session *is, union ccb *ccb) 2161 { 2162 struct icl_pdu *request; 2163 struct iscsi_bhs_task_management_request *bhstmr; 2164 struct ccb_abort *cab = &ccb->cab; 2165 struct iscsi_outstanding *io, *aio; 2166 uint32_t initiator_task_tag; 2167 2168 ISCSI_SESSION_LOCK_ASSERT(is); 2169 2170 #if 0 2171 KASSERT(is->is_login_phase == false, ("%s called during Login Phase", __func__)); 2172 #else 2173 if (is->is_login_phase) { 2174 ccb->ccb_h.status = CAM_REQ_ABORTED; 2175 xpt_done(ccb); 2176 return; 2177 } 2178 #endif 2179 2180 aio = iscsi_outstanding_find_ccb(is, cab->abort_ccb); 2181 if (aio == NULL) { 2182 ccb->ccb_h.status = CAM_REQ_CMP; 2183 xpt_done(ccb); 2184 return; 2185 } 2186 2187 request = icl_pdu_new(is->is_conn, M_NOWAIT); 2188 if (request == NULL) { 2189 ccb->ccb_h.status = CAM_RESRC_UNAVAIL; 2190 xpt_done(ccb); 2191 return; 2192 } 2193 2194 initiator_task_tag = is->is_initiator_task_tag++; 2195 if (initiator_task_tag == 0xffffffff) 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_referenced_task_tag = 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 if (initiator_task_tag == 0xffffffff) 2258 initiator_task_tag = is->is_initiator_task_tag++; 2259 2260 io = iscsi_outstanding_add(is, request, ccb, &initiator_task_tag); 2261 if (io == NULL) { 2262 icl_pdu_free(request); 2263 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 2264 xpt_freeze_devq(ccb->ccb_h.path, 1); 2265 ISCSI_SESSION_DEBUG(is, "freezing devq"); 2266 } 2267 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN; 2268 xpt_done(ccb); 2269 return; 2270 } 2271 2272 csio = &ccb->csio; 2273 bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs; 2274 bhssc->bhssc_opcode = ISCSI_BHS_OPCODE_SCSI_COMMAND; 2275 bhssc->bhssc_flags |= BHSSC_FLAGS_F; 2276 switch (csio->ccb_h.flags & CAM_DIR_MASK) { 2277 case CAM_DIR_IN: 2278 bhssc->bhssc_flags |= BHSSC_FLAGS_R; 2279 break; 2280 case CAM_DIR_OUT: 2281 bhssc->bhssc_flags |= BHSSC_FLAGS_W; 2282 break; 2283 } 2284 2285 if ((ccb->ccb_h.flags & CAM_TAG_ACTION_VALID) != 0) { 2286 switch (csio->tag_action) { 2287 case MSG_HEAD_OF_Q_TAG: 2288 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_HOQ; 2289 break; 2290 case MSG_ORDERED_Q_TAG: 2291 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_ORDERED; 2292 break; 2293 case MSG_ACA_TASK: 2294 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_ACA; 2295 break; 2296 case MSG_SIMPLE_Q_TAG: 2297 default: 2298 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_SIMPLE; 2299 break; 2300 } 2301 } else 2302 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_UNTAGGED; 2303 2304 if (is->is_protocol_level >= 2) { 2305 bhssc->bhssc_pri = (csio->priority << BHSSC_PRI_SHIFT) & 2306 BHSSC_PRI_MASK; 2307 } 2308 2309 bhssc->bhssc_lun = htobe64(CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun)); 2310 bhssc->bhssc_initiator_task_tag = initiator_task_tag; 2311 bhssc->bhssc_expected_data_transfer_length = htonl(csio->dxfer_len); 2312 KASSERT(csio->cdb_len <= sizeof(bhssc->bhssc_cdb), 2313 ("unsupported CDB size %zd", (size_t)csio->cdb_len)); 2314 2315 if (csio->ccb_h.flags & CAM_CDB_POINTER) 2316 memcpy(&bhssc->bhssc_cdb, csio->cdb_io.cdb_ptr, csio->cdb_len); 2317 else 2318 memcpy(&bhssc->bhssc_cdb, csio->cdb_io.cdb_bytes, csio->cdb_len); 2319 2320 if (is->is_immediate_data && 2321 (csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT) { 2322 len = csio->dxfer_len; 2323 //ISCSI_SESSION_DEBUG(is, "adding %zd of immediate data", len); 2324 if (len > is->is_first_burst_length) { 2325 ISCSI_SESSION_DEBUG(is, "len %zd -> %d", len, is->is_first_burst_length); 2326 len = is->is_first_burst_length; 2327 } 2328 if (len > is->is_max_send_data_segment_length) { 2329 ISCSI_SESSION_DEBUG(is, "len %zd -> %d", len, 2330 is->is_max_send_data_segment_length); 2331 len = is->is_max_send_data_segment_length; 2332 } 2333 2334 error = icl_pdu_append_data(request, csio->data_ptr, len, M_NOWAIT); 2335 if (error != 0) { 2336 iscsi_outstanding_remove(is, io); 2337 icl_pdu_free(request); 2338 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 2339 xpt_freeze_devq(ccb->ccb_h.path, 1); 2340 ISCSI_SESSION_DEBUG(is, "freezing devq"); 2341 } 2342 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN; 2343 xpt_done(ccb); 2344 return; 2345 } 2346 } 2347 iscsi_pdu_queue_locked(request); 2348 } 2349 2350 static void 2351 iscsi_action(struct cam_sim *sim, union ccb *ccb) 2352 { 2353 struct iscsi_session *is; 2354 2355 is = cam_sim_softc(sim); 2356 2357 ISCSI_SESSION_LOCK_ASSERT(is); 2358 2359 if (is->is_terminating || 2360 (is->is_connected == false && fail_on_disconnection)) { 2361 ccb->ccb_h.status = CAM_DEV_NOT_THERE; 2362 xpt_done(ccb); 2363 return; 2364 } 2365 2366 /* 2367 * Make sure CAM doesn't sneak in a CCB just after freezing the queue. 2368 */ 2369 if (is->is_simq_frozen == true) { 2370 ccb->ccb_h.status &= ~(CAM_SIM_QUEUED | CAM_STATUS_MASK); 2371 ccb->ccb_h.status |= CAM_REQUEUE_REQ; 2372 /* Don't freeze the devq - the SIM queue is already frozen. */ 2373 xpt_done(ccb); 2374 return; 2375 } 2376 2377 switch (ccb->ccb_h.func_code) { 2378 case XPT_PATH_INQ: 2379 { 2380 struct ccb_pathinq *cpi = &ccb->cpi; 2381 2382 cpi->version_num = 1; 2383 cpi->hba_inquiry = PI_TAG_ABLE; 2384 cpi->target_sprt = 0; 2385 cpi->hba_misc = PIM_EXTLUNS; 2386 /* 2387 * XXX: It shouldn't ever be NULL; this could be turned 2388 * into a KASSERT eventually. 2389 */ 2390 if (is->is_conn == NULL) 2391 ISCSI_WARN("NULL conn"); 2392 else if (is->is_conn->ic_unmapped) 2393 cpi->hba_misc |= PIM_UNMAPPED; 2394 cpi->hba_eng_cnt = 0; 2395 cpi->max_target = 0; 2396 /* 2397 * Note that the variable below is only relevant for targets 2398 * that don't claim compliance with anything above SPC2, which 2399 * means they don't support REPORT_LUNS. 2400 */ 2401 cpi->max_lun = 255; 2402 cpi->initiator_id = ~0; 2403 strlcpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN); 2404 strlcpy(cpi->hba_vid, "iSCSI", HBA_IDLEN); 2405 strlcpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN); 2406 cpi->unit_number = cam_sim_unit(sim); 2407 cpi->bus_id = cam_sim_bus(sim); 2408 cpi->base_transfer_speed = 150000; /* XXX */ 2409 cpi->transport = XPORT_ISCSI; 2410 cpi->transport_version = 0; 2411 cpi->protocol = PROTO_SCSI; 2412 cpi->protocol_version = SCSI_REV_SPC3; 2413 cpi->maxio = maxphys; 2414 cpi->ccb_h.status = CAM_REQ_CMP; 2415 break; 2416 } 2417 case XPT_GET_TRAN_SETTINGS: 2418 { 2419 struct ccb_trans_settings *cts; 2420 struct ccb_trans_settings_scsi *scsi; 2421 2422 cts = &ccb->cts; 2423 scsi = &cts->proto_specific.scsi; 2424 2425 cts->protocol = PROTO_SCSI; 2426 cts->protocol_version = SCSI_REV_SPC3; 2427 cts->transport = XPORT_ISCSI; 2428 cts->transport_version = 0; 2429 scsi->valid = CTS_SCSI_VALID_TQ; 2430 scsi->flags = CTS_SCSI_FLAGS_TAG_ENB; 2431 cts->ccb_h.status = CAM_REQ_CMP; 2432 break; 2433 } 2434 case XPT_CALC_GEOMETRY: 2435 cam_calc_geometry(&ccb->ccg, /*extended*/1); 2436 ccb->ccb_h.status = CAM_REQ_CMP; 2437 break; 2438 #if 0 2439 /* 2440 * XXX: What's the point? 2441 */ 2442 case XPT_RESET_BUS: 2443 case XPT_TERM_IO: 2444 ISCSI_SESSION_DEBUG(is, "faking success for reset, abort, or term_io"); 2445 ccb->ccb_h.status = CAM_REQ_CMP; 2446 break; 2447 #endif 2448 case XPT_ABORT: 2449 iscsi_action_abort(is, ccb); 2450 return; 2451 case XPT_SCSI_IO: 2452 iscsi_action_scsiio(is, ccb); 2453 return; 2454 default: 2455 #if 0 2456 ISCSI_SESSION_DEBUG(is, "got unsupported code 0x%x", ccb->ccb_h.func_code); 2457 #endif 2458 ccb->ccb_h.status = CAM_FUNC_NOTAVAIL; 2459 break; 2460 } 2461 xpt_done(ccb); 2462 } 2463 2464 static void 2465 iscsi_terminate_sessions(struct iscsi_softc *sc) 2466 { 2467 struct iscsi_session *is; 2468 2469 sx_slock(&sc->sc_lock); 2470 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) 2471 iscsi_session_terminate(is); 2472 while(!TAILQ_EMPTY(&sc->sc_sessions)) { 2473 ISCSI_DEBUG("waiting for sessions to terminate"); 2474 cv_wait(&sc->sc_cv, &sc->sc_lock); 2475 } 2476 ISCSI_DEBUG("all sessions terminated"); 2477 sx_sunlock(&sc->sc_lock); 2478 } 2479 2480 static void 2481 iscsi_shutdown_pre(struct iscsi_softc *sc) 2482 { 2483 struct iscsi_session *is; 2484 2485 if (!fail_on_shutdown) 2486 return; 2487 2488 /* 2489 * If we have any sessions waiting for reconnection, request 2490 * maintenance thread to fail them immediately instead of waiting 2491 * for reconnect timeout. 2492 * 2493 * This prevents LUNs with mounted filesystems that are supported 2494 * by disconnected iSCSI sessions from hanging, however it will 2495 * fail all queued BIOs. 2496 */ 2497 ISCSI_DEBUG("forcing failing all disconnected sessions due to shutdown"); 2498 2499 fail_on_disconnection = 1; 2500 2501 sx_slock(&sc->sc_lock); 2502 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 2503 ISCSI_SESSION_LOCK(is); 2504 if (!is->is_connected) { 2505 ISCSI_SESSION_DEBUG(is, "force failing disconnected session early"); 2506 iscsi_session_reconnect(is); 2507 } 2508 ISCSI_SESSION_UNLOCK(is); 2509 } 2510 sx_sunlock(&sc->sc_lock); 2511 } 2512 2513 static void 2514 iscsi_shutdown_post(struct iscsi_softc *sc) 2515 { 2516 2517 if (!KERNEL_PANICKED()) { 2518 ISCSI_DEBUG("removing all sessions due to shutdown"); 2519 iscsi_terminate_sessions(sc); 2520 } 2521 } 2522 2523 static int 2524 iscsi_load(void) 2525 { 2526 int error; 2527 2528 sc = malloc(sizeof(*sc), M_ISCSI, M_ZERO | M_WAITOK); 2529 sx_init(&sc->sc_lock, "iscsi"); 2530 TAILQ_INIT(&sc->sc_sessions); 2531 cv_init(&sc->sc_cv, "iscsi_cv"); 2532 2533 iscsi_outstanding_zone = uma_zcreate("iscsi_outstanding", 2534 sizeof(struct iscsi_outstanding), NULL, NULL, NULL, NULL, 2535 UMA_ALIGN_PTR, 0); 2536 2537 error = make_dev_p(MAKEDEV_CHECKNAME, &sc->sc_cdev, &iscsi_cdevsw, 2538 NULL, UID_ROOT, GID_WHEEL, 0600, "iscsi"); 2539 if (error != 0) { 2540 ISCSI_WARN("failed to create device node, error %d", error); 2541 return (error); 2542 } 2543 sc->sc_cdev->si_drv1 = sc; 2544 2545 sc->sc_shutdown_pre_eh = EVENTHANDLER_REGISTER(shutdown_pre_sync, 2546 iscsi_shutdown_pre, sc, SHUTDOWN_PRI_FIRST); 2547 /* 2548 * shutdown_post_sync needs to run after filesystem shutdown and before 2549 * CAM shutdown - otherwise when rebooting with an iSCSI session that is 2550 * disconnected but has outstanding requests, dashutdown() will hang on 2551 * cam_periph_runccb(). 2552 */ 2553 sc->sc_shutdown_post_eh = EVENTHANDLER_REGISTER(shutdown_post_sync, 2554 iscsi_shutdown_post, sc, SHUTDOWN_PRI_DEFAULT - 1); 2555 2556 return (0); 2557 } 2558 2559 static int 2560 iscsi_unload(void) 2561 { 2562 2563 if (sc->sc_cdev != NULL) { 2564 ISCSI_DEBUG("removing device node"); 2565 destroy_dev(sc->sc_cdev); 2566 ISCSI_DEBUG("device node removed"); 2567 } 2568 2569 if (sc->sc_shutdown_pre_eh != NULL) 2570 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, sc->sc_shutdown_pre_eh); 2571 if (sc->sc_shutdown_post_eh != NULL) 2572 EVENTHANDLER_DEREGISTER(shutdown_post_sync, sc->sc_shutdown_post_eh); 2573 2574 iscsi_terminate_sessions(sc); 2575 2576 uma_zdestroy(iscsi_outstanding_zone); 2577 sx_destroy(&sc->sc_lock); 2578 cv_destroy(&sc->sc_cv); 2579 free(sc, M_ISCSI); 2580 return (0); 2581 } 2582 2583 static int 2584 iscsi_quiesce(void) 2585 { 2586 sx_slock(&sc->sc_lock); 2587 if (!TAILQ_EMPTY(&sc->sc_sessions)) { 2588 sx_sunlock(&sc->sc_lock); 2589 return (EBUSY); 2590 } 2591 sx_sunlock(&sc->sc_lock); 2592 return (0); 2593 } 2594 2595 static int 2596 iscsi_modevent(module_t mod, int what, void *arg) 2597 { 2598 int error; 2599 2600 switch (what) { 2601 case MOD_LOAD: 2602 error = iscsi_load(); 2603 break; 2604 case MOD_UNLOAD: 2605 error = iscsi_unload(); 2606 break; 2607 case MOD_QUIESCE: 2608 error = iscsi_quiesce(); 2609 break; 2610 default: 2611 error = EINVAL; 2612 break; 2613 } 2614 return (error); 2615 } 2616 2617 moduledata_t iscsi_data = { 2618 "iscsi", 2619 iscsi_modevent, 2620 0 2621 }; 2622 2623 DECLARE_MODULE(iscsi, iscsi_data, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 2624 MODULE_DEPEND(iscsi, cam, 1, 1, 1); 2625 MODULE_DEPEND(iscsi, icl, 1, 1, 1); 2626