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 if (bhssr->bhssr_response == BHSSR_RESPONSE_COMMAND_COMPLETED) { 896 if (ntohl(bhssr->bhssr_expdatasn) != io->io_datasn) { 897 ISCSI_SESSION_WARN(is, 898 "ExpDataSN mismatch in SCSI Response (%u vs %u)", 899 ntohl(bhssr->bhssr_expdatasn), io->io_datasn); 900 901 /* 902 * XXX: Permit an ExpDataSN of zero for errors. 903 * 904 * This doesn't conform to RFC 7143, but some 905 * targets seem to do this. 906 */ 907 if (bhssr->bhssr_status != 0 && 908 bhssr->bhssr_expdatasn == htonl(0)) 909 goto skip_expdatasn; 910 911 icl_pdu_free(response); 912 iscsi_session_reconnect(is); 913 ISCSI_SESSION_UNLOCK(is); 914 return; 915 } 916 } else { 917 if (bhssr->bhssr_expdatasn != htonl(0)) { 918 ISCSI_SESSION_WARN(is, 919 "ExpDataSN mismatch in SCSI Response (%u vs 0)", 920 ntohl(bhssr->bhssr_expdatasn)); 921 icl_pdu_free(response); 922 iscsi_session_reconnect(is); 923 ISCSI_SESSION_UNLOCK(is); 924 return; 925 } 926 } 927 skip_expdatasn: 928 929 /* 930 * With iSER, after getting good response we can be sure 931 * that all the data has been successfully transferred. 932 */ 933 if (is->is_conn->ic_iser) { 934 resid = ntohl(bhssr->bhssr_residual_count); 935 if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_UNDERFLOW) { 936 io->io_received = ccb->csio.dxfer_len - resid; 937 } else if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_OVERFLOW) { 938 ISCSI_SESSION_WARN(is, "overflow: target indicates %d", resid); 939 } else { 940 io->io_received = ccb->csio.dxfer_len; 941 } 942 } 943 944 received = io->io_received; 945 iscsi_outstanding_remove(is, io); 946 ISCSI_SESSION_UNLOCK(is); 947 948 if (bhssr->bhssr_response != BHSSR_RESPONSE_COMMAND_COMPLETED) { 949 ISCSI_SESSION_WARN(is, "service response 0x%x", bhssr->bhssr_response); 950 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 951 xpt_freeze_devq(ccb->ccb_h.path, 1); 952 ISCSI_SESSION_DEBUG(is, "freezing devq"); 953 } 954 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN; 955 } else if (bhssr->bhssr_status == 0) { 956 ccb->ccb_h.status = CAM_REQ_CMP; 957 } else { 958 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 959 xpt_freeze_devq(ccb->ccb_h.path, 1); 960 ISCSI_SESSION_DEBUG(is, "freezing devq"); 961 } 962 ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR | CAM_DEV_QFRZN; 963 ccb->csio.scsi_status = bhssr->bhssr_status; 964 } 965 966 csio = &ccb->csio; 967 data_segment_len = icl_pdu_data_segment_length(response); 968 if (data_segment_len > 0) { 969 if (data_segment_len < sizeof(sense_len)) { 970 ISCSI_SESSION_WARN(is, "truncated data segment (%zd bytes)", 971 data_segment_len); 972 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 973 xpt_freeze_devq(ccb->ccb_h.path, 1); 974 ISCSI_SESSION_DEBUG(is, "freezing devq"); 975 } 976 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN; 977 goto out; 978 } 979 icl_pdu_get_data(response, 0, &sense_len, sizeof(sense_len)); 980 sense_len = ntohs(sense_len); 981 #if 0 982 ISCSI_SESSION_DEBUG(is, "sense_len %d, data len %zd", 983 sense_len, data_segment_len); 984 #endif 985 if (sizeof(sense_len) + sense_len > data_segment_len) { 986 ISCSI_SESSION_WARN(is, "truncated data segment " 987 "(%zd bytes, should be %zd)", 988 data_segment_len, sizeof(sense_len) + sense_len); 989 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 990 xpt_freeze_devq(ccb->ccb_h.path, 1); 991 ISCSI_SESSION_DEBUG(is, "freezing devq"); 992 } 993 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN; 994 goto out; 995 } else if (sizeof(sense_len) + sense_len < data_segment_len) 996 ISCSI_SESSION_WARN(is, "oversize data segment " 997 "(%zd bytes, should be %zd)", 998 data_segment_len, sizeof(sense_len) + sense_len); 999 if (sense_len > csio->sense_len) { 1000 ISCSI_SESSION_DEBUG(is, "truncating sense from %d to %d", 1001 sense_len, csio->sense_len); 1002 sense_len = csio->sense_len; 1003 } 1004 icl_pdu_get_data(response, sizeof(sense_len), &csio->sense_data, sense_len); 1005 csio->sense_resid = csio->sense_len - sense_len; 1006 ccb->ccb_h.status |= CAM_AUTOSNS_VALID; 1007 } 1008 1009 out: 1010 if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_UNDERFLOW) 1011 csio->resid = ntohl(bhssr->bhssr_residual_count); 1012 1013 if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) { 1014 KASSERT(received <= csio->dxfer_len, 1015 ("received > csio->dxfer_len")); 1016 if (received < csio->dxfer_len) { 1017 if (csio->resid != csio->dxfer_len - received) { 1018 ISCSI_SESSION_WARN(is, "underflow mismatch: " 1019 "target indicates %d, we calculated %zd", 1020 csio->resid, csio->dxfer_len - received); 1021 } 1022 csio->resid = csio->dxfer_len - received; 1023 } 1024 } 1025 1026 xpt_done(ccb); 1027 icl_pdu_free(response); 1028 } 1029 1030 static void 1031 iscsi_pdu_handle_task_response(struct icl_pdu *response) 1032 { 1033 struct iscsi_bhs_task_management_response *bhstmr; 1034 struct iscsi_outstanding *io, *aio; 1035 struct iscsi_session *is; 1036 1037 is = PDU_SESSION(response); 1038 1039 bhstmr = (struct iscsi_bhs_task_management_response *)response->ip_bhs; 1040 io = iscsi_outstanding_find(is, bhstmr->bhstmr_initiator_task_tag); 1041 if (io == NULL || io->io_ccb != NULL) { 1042 ISCSI_SESSION_WARN(is, "bad itt 0x%x", 1043 bhstmr->bhstmr_initiator_task_tag); 1044 icl_pdu_free(response); 1045 iscsi_session_reconnect(is); 1046 return; 1047 } 1048 1049 if (bhstmr->bhstmr_response != BHSTMR_RESPONSE_FUNCTION_COMPLETE) { 1050 ISCSI_SESSION_WARN(is, "task response 0x%x", 1051 bhstmr->bhstmr_response); 1052 } else { 1053 aio = iscsi_outstanding_find(is, io->io_referenced_task_tag); 1054 if (aio != NULL && aio->io_ccb != NULL) 1055 iscsi_session_terminate_task(is, aio, CAM_REQ_ABORTED); 1056 } 1057 1058 iscsi_outstanding_remove(is, io); 1059 icl_pdu_free(response); 1060 } 1061 1062 static void 1063 iscsi_pdu_handle_data_in(struct icl_pdu *response) 1064 { 1065 struct iscsi_bhs_data_in *bhsdi; 1066 struct iscsi_outstanding *io; 1067 struct iscsi_session *is; 1068 union ccb *ccb; 1069 struct ccb_scsiio *csio; 1070 size_t data_segment_len, received, oreceived; 1071 1072 is = PDU_SESSION(response); 1073 bhsdi = (struct iscsi_bhs_data_in *)response->ip_bhs; 1074 io = iscsi_outstanding_find(is, bhsdi->bhsdi_initiator_task_tag); 1075 if (io == NULL || io->io_ccb == NULL) { 1076 ISCSI_SESSION_WARN(is, "bad itt 0x%x", bhsdi->bhsdi_initiator_task_tag); 1077 icl_pdu_free(response); 1078 iscsi_session_reconnect(is); 1079 ISCSI_SESSION_UNLOCK(is); 1080 return; 1081 } 1082 1083 if (io->io_datasn != ntohl(bhsdi->bhsdi_datasn)) { 1084 ISCSI_SESSION_WARN(is, "received Data-In PDU with " 1085 "DataSN %u, while expected %u; dropping connection", 1086 ntohl(bhsdi->bhsdi_datasn), io->io_datasn); 1087 icl_pdu_free(response); 1088 iscsi_session_reconnect(is); 1089 ISCSI_SESSION_UNLOCK(is); 1090 return; 1091 } 1092 io->io_datasn += response->ip_additional_pdus + 1; 1093 1094 data_segment_len = icl_pdu_data_segment_length(response); 1095 if (data_segment_len == 0) { 1096 /* 1097 * "The sending of 0 length data segments should be avoided, 1098 * but initiators and targets MUST be able to properly receive 1099 * 0 length data segments." 1100 */ 1101 ISCSI_SESSION_UNLOCK(is); 1102 icl_pdu_free(response); 1103 return; 1104 } 1105 1106 /* 1107 * We need to track this for security reasons - without it, malicious target 1108 * could respond to SCSI READ without sending Data-In PDUs, which would result 1109 * in read operation on the initiator side returning random kernel data. 1110 */ 1111 if (ntohl(bhsdi->bhsdi_buffer_offset) != io->io_received) { 1112 ISCSI_SESSION_WARN(is, "data out of order; expected offset %zd, got %zd", 1113 io->io_received, (size_t)ntohl(bhsdi->bhsdi_buffer_offset)); 1114 icl_pdu_free(response); 1115 iscsi_session_reconnect(is); 1116 ISCSI_SESSION_UNLOCK(is); 1117 return; 1118 } 1119 1120 ccb = io->io_ccb; 1121 csio = &ccb->csio; 1122 1123 if (io->io_received + data_segment_len > csio->dxfer_len) { 1124 ISCSI_SESSION_WARN(is, "oversize data segment (%zd bytes " 1125 "at offset %zd, buffer is %d)", 1126 data_segment_len, io->io_received, csio->dxfer_len); 1127 icl_pdu_free(response); 1128 iscsi_session_reconnect(is); 1129 ISCSI_SESSION_UNLOCK(is); 1130 return; 1131 } 1132 1133 oreceived = io->io_received; 1134 io->io_received += data_segment_len; 1135 received = io->io_received; 1136 if ((bhsdi->bhsdi_flags & BHSDI_FLAGS_S) != 0) 1137 iscsi_outstanding_remove(is, io); 1138 ISCSI_SESSION_UNLOCK(is); 1139 1140 icl_pdu_get_data(response, 0, csio->data_ptr + oreceived, data_segment_len); 1141 1142 /* 1143 * XXX: Check F. 1144 */ 1145 if ((bhsdi->bhsdi_flags & BHSDI_FLAGS_S) == 0) { 1146 /* 1147 * Nothing more to do. 1148 */ 1149 icl_pdu_free(response); 1150 return; 1151 } 1152 1153 //ISCSI_SESSION_DEBUG(is, "got S flag; status 0x%x", bhsdi->bhsdi_status); 1154 if (bhsdi->bhsdi_status == 0) { 1155 ccb->ccb_h.status = CAM_REQ_CMP; 1156 } else { 1157 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 1158 xpt_freeze_devq(ccb->ccb_h.path, 1); 1159 ISCSI_SESSION_DEBUG(is, "freezing devq"); 1160 } 1161 ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR | CAM_DEV_QFRZN; 1162 csio->scsi_status = bhsdi->bhsdi_status; 1163 } 1164 1165 if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) { 1166 KASSERT(received <= csio->dxfer_len, 1167 ("received > csio->dxfer_len")); 1168 if (received < csio->dxfer_len) { 1169 csio->resid = ntohl(bhsdi->bhsdi_residual_count); 1170 if (csio->resid != csio->dxfer_len - received) { 1171 ISCSI_SESSION_WARN(is, "underflow mismatch: " 1172 "target indicates %d, we calculated %zd", 1173 csio->resid, csio->dxfer_len - received); 1174 } 1175 csio->resid = csio->dxfer_len - received; 1176 } 1177 } 1178 1179 xpt_done(ccb); 1180 icl_pdu_free(response); 1181 } 1182 1183 static void 1184 iscsi_pdu_handle_logout_response(struct icl_pdu *response) 1185 { 1186 1187 ISCSI_SESSION_DEBUG(PDU_SESSION(response), "logout response"); 1188 icl_pdu_free(response); 1189 } 1190 1191 static void 1192 iscsi_pdu_handle_r2t(struct icl_pdu *response) 1193 { 1194 struct icl_pdu *request; 1195 struct iscsi_session *is; 1196 struct iscsi_bhs_r2t *bhsr2t; 1197 struct iscsi_bhs_data_out *bhsdo; 1198 struct iscsi_outstanding *io; 1199 struct ccb_scsiio *csio; 1200 size_t off, len, max_send_data_segment_length, total_len; 1201 int error; 1202 uint32_t datasn = 0; 1203 1204 is = PDU_SESSION(response); 1205 1206 bhsr2t = (struct iscsi_bhs_r2t *)response->ip_bhs; 1207 io = iscsi_outstanding_find(is, bhsr2t->bhsr2t_initiator_task_tag); 1208 if (io == NULL || io->io_ccb == NULL) { 1209 ISCSI_SESSION_WARN(is, "bad itt 0x%x; reconnecting", 1210 bhsr2t->bhsr2t_initiator_task_tag); 1211 icl_pdu_free(response); 1212 iscsi_session_reconnect(is); 1213 return; 1214 } 1215 1216 csio = &io->io_ccb->csio; 1217 1218 if ((csio->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_OUT) { 1219 ISCSI_SESSION_WARN(is, "received R2T for read command; reconnecting"); 1220 icl_pdu_free(response); 1221 iscsi_session_reconnect(is); 1222 return; 1223 } 1224 1225 /* 1226 * XXX: Verify R2TSN. 1227 */ 1228 1229 off = ntohl(bhsr2t->bhsr2t_buffer_offset); 1230 if (off > csio->dxfer_len) { 1231 ISCSI_SESSION_WARN(is, "target requested invalid offset " 1232 "%zd, buffer is is %d; reconnecting", off, csio->dxfer_len); 1233 icl_pdu_free(response); 1234 iscsi_session_reconnect(is); 1235 return; 1236 } 1237 1238 total_len = ntohl(bhsr2t->bhsr2t_desired_data_transfer_length); 1239 if (total_len == 0 || total_len > csio->dxfer_len) { 1240 ISCSI_SESSION_WARN(is, "target requested invalid length " 1241 "%zd, buffer is %d; reconnecting", total_len, csio->dxfer_len); 1242 icl_pdu_free(response); 1243 iscsi_session_reconnect(is); 1244 return; 1245 } 1246 1247 //ISCSI_SESSION_DEBUG(is, "r2t; off %zd, len %zd", off, total_len); 1248 1249 if (is->is_conn->ic_hw_isomax != 0) 1250 max_send_data_segment_length = is->is_conn->ic_hw_isomax; 1251 else 1252 max_send_data_segment_length = 1253 is->is_conn->ic_max_send_data_segment_length; 1254 for (;;) { 1255 len = total_len; 1256 1257 if (len > max_send_data_segment_length) 1258 len = max_send_data_segment_length; 1259 1260 if (off + len > csio->dxfer_len) { 1261 ISCSI_SESSION_WARN(is, "target requested invalid " 1262 "length/offset %zd, buffer is %d; reconnecting", 1263 off + len, csio->dxfer_len); 1264 icl_pdu_free(response); 1265 iscsi_session_reconnect(is); 1266 return; 1267 } 1268 1269 request = icl_pdu_new(response->ip_conn, M_NOWAIT); 1270 if (request == NULL) { 1271 icl_pdu_free(response); 1272 iscsi_session_reconnect(is); 1273 return; 1274 } 1275 1276 bhsdo = (struct iscsi_bhs_data_out *)request->ip_bhs; 1277 bhsdo->bhsdo_opcode = ISCSI_BHS_OPCODE_SCSI_DATA_OUT; 1278 bhsdo->bhsdo_lun = bhsr2t->bhsr2t_lun; 1279 bhsdo->bhsdo_initiator_task_tag = 1280 bhsr2t->bhsr2t_initiator_task_tag; 1281 bhsdo->bhsdo_target_transfer_tag = 1282 bhsr2t->bhsr2t_target_transfer_tag; 1283 bhsdo->bhsdo_datasn = htonl(datasn); 1284 bhsdo->bhsdo_buffer_offset = htonl(off); 1285 error = icl_pdu_append_data(request, csio->data_ptr + off, len, 1286 M_NOWAIT); 1287 if (error != 0) { 1288 ISCSI_SESSION_WARN(is, "failed to allocate memory; " 1289 "reconnecting"); 1290 icl_pdu_free(request); 1291 icl_pdu_free(response); 1292 iscsi_session_reconnect(is); 1293 return; 1294 } 1295 1296 datasn += howmany(len, 1297 is->is_conn->ic_max_send_data_segment_length); 1298 off += len; 1299 total_len -= len; 1300 1301 if (total_len == 0) { 1302 bhsdo->bhsdo_flags |= BHSDO_FLAGS_F; 1303 //ISCSI_SESSION_DEBUG(is, "setting F, off %zd", off); 1304 } else { 1305 //ISCSI_SESSION_DEBUG(is, "not finished, off %zd", off); 1306 } 1307 1308 iscsi_pdu_queue_locked(request); 1309 1310 if (total_len == 0) 1311 break; 1312 } 1313 1314 icl_pdu_free(response); 1315 } 1316 1317 static void 1318 iscsi_pdu_handle_async_message(struct icl_pdu *response) 1319 { 1320 struct iscsi_bhs_asynchronous_message *bhsam; 1321 struct iscsi_session *is; 1322 1323 is = PDU_SESSION(response); 1324 bhsam = (struct iscsi_bhs_asynchronous_message *)response->ip_bhs; 1325 switch (bhsam->bhsam_async_event) { 1326 case BHSAM_EVENT_TARGET_REQUESTS_LOGOUT: 1327 ISCSI_SESSION_WARN(is, "target requests logout; removing session"); 1328 iscsi_session_logout(is); 1329 iscsi_session_terminate(is); 1330 break; 1331 case BHSAM_EVENT_TARGET_TERMINATES_CONNECTION: 1332 ISCSI_SESSION_WARN(is, "target indicates it will drop the connection"); 1333 break; 1334 case BHSAM_EVENT_TARGET_TERMINATES_SESSION: 1335 ISCSI_SESSION_WARN(is, "target indicates it will drop the session"); 1336 break; 1337 default: 1338 /* 1339 * XXX: Technically, we're obligated to also handle 1340 * parameter renegotiation. 1341 */ 1342 ISCSI_SESSION_WARN(is, "ignoring AsyncEvent %d", bhsam->bhsam_async_event); 1343 break; 1344 } 1345 1346 icl_pdu_free(response); 1347 } 1348 1349 static void 1350 iscsi_pdu_handle_reject(struct icl_pdu *response) 1351 { 1352 struct iscsi_bhs_reject *bhsr; 1353 struct iscsi_session *is; 1354 1355 is = PDU_SESSION(response); 1356 bhsr = (struct iscsi_bhs_reject *)response->ip_bhs; 1357 ISCSI_SESSION_WARN(is, "received Reject PDU, reason 0x%x; protocol error?", 1358 bhsr->bhsr_reason); 1359 1360 icl_pdu_free(response); 1361 } 1362 1363 static int 1364 iscsi_ioctl_daemon_wait(struct iscsi_softc *sc, 1365 struct iscsi_daemon_request *request) 1366 { 1367 struct iscsi_session *is; 1368 struct icl_drv_limits idl; 1369 int error; 1370 1371 sx_slock(&sc->sc_lock); 1372 for (;;) { 1373 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1374 ISCSI_SESSION_LOCK(is); 1375 if (is->is_conf.isc_enable == 0 && 1376 is->is_conf.isc_discovery == 0) { 1377 ISCSI_SESSION_UNLOCK(is); 1378 continue; 1379 } 1380 if (is->is_waiting_for_iscsid) 1381 break; 1382 ISCSI_SESSION_UNLOCK(is); 1383 } 1384 1385 if (is == NULL) { 1386 if (sc->sc_unloading) { 1387 sx_sunlock(&sc->sc_lock); 1388 return (ENXIO); 1389 } 1390 1391 /* 1392 * No session requires attention from iscsid(8); wait. 1393 */ 1394 error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock); 1395 if (error != 0) { 1396 sx_sunlock(&sc->sc_lock); 1397 return (error); 1398 } 1399 continue; 1400 } 1401 1402 is->is_waiting_for_iscsid = false; 1403 is->is_login_phase = true; 1404 is->is_reason[0] = '\0'; 1405 ISCSI_SESSION_UNLOCK(is); 1406 1407 request->idr_session_id = is->is_id; 1408 memcpy(&request->idr_isid, &is->is_isid, 1409 sizeof(request->idr_isid)); 1410 request->idr_tsih = 0; /* New or reinstated session. */ 1411 memcpy(&request->idr_conf, &is->is_conf, 1412 sizeof(request->idr_conf)); 1413 1414 error = icl_limits(is->is_conf.isc_offload, 1415 is->is_conf.isc_iser, &idl); 1416 if (error != 0) { 1417 ISCSI_SESSION_WARN(is, "icl_limits for offload \"%s\" " 1418 "failed with error %d", is->is_conf.isc_offload, 1419 error); 1420 sx_sunlock(&sc->sc_lock); 1421 return (error); 1422 } 1423 request->idr_limits.isl_max_recv_data_segment_length = 1424 idl.idl_max_recv_data_segment_length; 1425 request->idr_limits.isl_max_send_data_segment_length = 1426 idl.idl_max_send_data_segment_length; 1427 request->idr_limits.isl_max_burst_length = 1428 idl.idl_max_burst_length; 1429 request->idr_limits.isl_first_burst_length = 1430 idl.idl_first_burst_length; 1431 1432 sx_sunlock(&sc->sc_lock); 1433 return (0); 1434 } 1435 } 1436 1437 static int 1438 iscsi_ioctl_daemon_handoff(struct iscsi_softc *sc, 1439 struct iscsi_daemon_handoff *handoff) 1440 { 1441 struct iscsi_session *is; 1442 struct icl_conn *ic; 1443 int error; 1444 1445 sx_slock(&sc->sc_lock); 1446 1447 /* 1448 * Find the session to hand off socket to. 1449 */ 1450 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1451 if (is->is_id == handoff->idh_session_id) 1452 break; 1453 } 1454 if (is == NULL) { 1455 sx_sunlock(&sc->sc_lock); 1456 return (ESRCH); 1457 } 1458 ISCSI_SESSION_LOCK(is); 1459 ic = is->is_conn; 1460 if (is->is_conf.isc_discovery || is->is_terminating) { 1461 ISCSI_SESSION_UNLOCK(is); 1462 sx_sunlock(&sc->sc_lock); 1463 return (EINVAL); 1464 } 1465 if (is->is_connected) { 1466 /* 1467 * This might have happened because another iscsid(8) 1468 * instance handed off the connection in the meantime. 1469 * Just return. 1470 */ 1471 ISCSI_SESSION_WARN(is, "handoff on already connected " 1472 "session"); 1473 ISCSI_SESSION_UNLOCK(is); 1474 sx_sunlock(&sc->sc_lock); 1475 return (EBUSY); 1476 } 1477 1478 strlcpy(is->is_target_alias, handoff->idh_target_alias, 1479 sizeof(is->is_target_alias)); 1480 is->is_tsih = handoff->idh_tsih; 1481 is->is_statsn = handoff->idh_statsn; 1482 is->is_protocol_level = handoff->idh_protocol_level; 1483 is->is_initial_r2t = handoff->idh_initial_r2t; 1484 is->is_immediate_data = handoff->idh_immediate_data; 1485 1486 ic->ic_max_recv_data_segment_length = 1487 handoff->idh_max_recv_data_segment_length; 1488 ic->ic_max_send_data_segment_length = 1489 handoff->idh_max_send_data_segment_length; 1490 is->is_max_burst_length = handoff->idh_max_burst_length; 1491 is->is_first_burst_length = handoff->idh_first_burst_length; 1492 1493 if (handoff->idh_header_digest == ISCSI_DIGEST_CRC32C) 1494 ic->ic_header_crc32c = true; 1495 else 1496 ic->ic_header_crc32c = false; 1497 if (handoff->idh_data_digest == ISCSI_DIGEST_CRC32C) 1498 ic->ic_data_crc32c = true; 1499 else 1500 ic->ic_data_crc32c = false; 1501 ic->ic_maxtags = maxtags; 1502 1503 is->is_cmdsn = 0; 1504 is->is_expcmdsn = 0; 1505 is->is_maxcmdsn = 0; 1506 is->is_waiting_for_iscsid = false; 1507 is->is_login_phase = false; 1508 is->is_timeout = 0; 1509 is->is_connected = true; 1510 is->is_reason[0] = '\0'; 1511 1512 ISCSI_SESSION_UNLOCK(is); 1513 1514 /* 1515 * If we're going through the proxy, the idh_socket will be 0, 1516 * and the ICL module can simply ignore this call. It can also 1517 * use it to determine it's no longer in the Login phase. 1518 */ 1519 error = icl_conn_handoff(ic, handoff->idh_socket); 1520 if (error != 0) { 1521 sx_sunlock(&sc->sc_lock); 1522 iscsi_session_terminate(is); 1523 return (error); 1524 } 1525 1526 sx_sunlock(&sc->sc_lock); 1527 1528 if (is->is_sim != NULL) { 1529 /* 1530 * When reconnecting, there already is SIM allocated for the session. 1531 */ 1532 KASSERT(is->is_simq_frozen, ("reconnect without frozen simq")); 1533 ISCSI_SESSION_LOCK(is); 1534 ISCSI_SESSION_DEBUG(is, "releasing"); 1535 is->is_simq_frozen = false; 1536 xpt_release_simq(is->is_sim, 1); 1537 ISCSI_SESSION_UNLOCK(is); 1538 1539 } else { 1540 ISCSI_SESSION_LOCK(is); 1541 is->is_devq = cam_simq_alloc(ic->ic_maxtags); 1542 if (is->is_devq == NULL) { 1543 ISCSI_SESSION_WARN(is, "failed to allocate simq"); 1544 iscsi_session_terminate(is); 1545 return (ENOMEM); 1546 } 1547 1548 is->is_sim = cam_sim_alloc(iscsi_action, NULL, "iscsi", 1549 is, is->is_id /* unit */, &is->is_lock, 1550 1, ic->ic_maxtags, is->is_devq); 1551 if (is->is_sim == NULL) { 1552 ISCSI_SESSION_UNLOCK(is); 1553 ISCSI_SESSION_WARN(is, "failed to allocate SIM"); 1554 cam_simq_free(is->is_devq); 1555 iscsi_session_terminate(is); 1556 return (ENOMEM); 1557 } 1558 1559 if (xpt_bus_register(is->is_sim, NULL, 0) != 0) { 1560 ISCSI_SESSION_UNLOCK(is); 1561 ISCSI_SESSION_WARN(is, "failed to register bus"); 1562 iscsi_session_terminate(is); 1563 return (ENOMEM); 1564 } 1565 1566 error = xpt_create_path(&is->is_path, /*periph*/NULL, 1567 cam_sim_path(is->is_sim), CAM_TARGET_WILDCARD, 1568 CAM_LUN_WILDCARD); 1569 if (error != CAM_REQ_CMP) { 1570 ISCSI_SESSION_UNLOCK(is); 1571 ISCSI_SESSION_WARN(is, "failed to create path"); 1572 iscsi_session_terminate(is); 1573 return (ENOMEM); 1574 } 1575 ISCSI_SESSION_UNLOCK(is); 1576 } 1577 1578 return (0); 1579 } 1580 1581 static int 1582 iscsi_ioctl_daemon_fail(struct iscsi_softc *sc, 1583 struct iscsi_daemon_fail *fail) 1584 { 1585 struct iscsi_session *is; 1586 1587 sx_slock(&sc->sc_lock); 1588 1589 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1590 if (is->is_id == fail->idf_session_id) 1591 break; 1592 } 1593 if (is == NULL) { 1594 sx_sunlock(&sc->sc_lock); 1595 return (ESRCH); 1596 } 1597 ISCSI_SESSION_LOCK(is); 1598 ISCSI_SESSION_DEBUG(is, "iscsid(8) failed: %s", 1599 fail->idf_reason); 1600 strlcpy(is->is_reason, fail->idf_reason, sizeof(is->is_reason)); 1601 //is->is_waiting_for_iscsid = false; 1602 //is->is_login_phase = true; 1603 //iscsi_session_reconnect(is); 1604 ISCSI_SESSION_UNLOCK(is); 1605 sx_sunlock(&sc->sc_lock); 1606 1607 return (0); 1608 } 1609 1610 #ifdef ICL_KERNEL_PROXY 1611 static int 1612 iscsi_ioctl_daemon_connect(struct iscsi_softc *sc, 1613 struct iscsi_daemon_connect *idc) 1614 { 1615 struct iscsi_session *is; 1616 struct sockaddr *from_sa, *to_sa; 1617 int error; 1618 1619 sx_slock(&sc->sc_lock); 1620 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1621 if (is->is_id == idc->idc_session_id) 1622 break; 1623 } 1624 if (is == NULL) { 1625 sx_sunlock(&sc->sc_lock); 1626 return (ESRCH); 1627 } 1628 sx_sunlock(&sc->sc_lock); 1629 1630 if (idc->idc_from_addrlen > 0) { 1631 error = getsockaddr(&from_sa, (void *)idc->idc_from_addr, idc->idc_from_addrlen); 1632 if (error != 0) { 1633 ISCSI_SESSION_WARN(is, 1634 "getsockaddr failed with error %d", error); 1635 return (error); 1636 } 1637 } else { 1638 from_sa = NULL; 1639 } 1640 error = getsockaddr(&to_sa, (void *)idc->idc_to_addr, idc->idc_to_addrlen); 1641 if (error != 0) { 1642 ISCSI_SESSION_WARN(is, "getsockaddr failed with error %d", 1643 error); 1644 free(from_sa, M_SONAME); 1645 return (error); 1646 } 1647 1648 ISCSI_SESSION_LOCK(is); 1649 is->is_statsn = 0; 1650 is->is_cmdsn = 0; 1651 is->is_expcmdsn = 0; 1652 is->is_maxcmdsn = 0; 1653 is->is_waiting_for_iscsid = false; 1654 is->is_login_phase = true; 1655 is->is_timeout = 0; 1656 ISCSI_SESSION_UNLOCK(is); 1657 1658 error = icl_conn_connect(is->is_conn, idc->idc_domain, 1659 idc->idc_socktype, idc->idc_protocol, from_sa, to_sa); 1660 free(from_sa, M_SONAME); 1661 free(to_sa, M_SONAME); 1662 1663 /* 1664 * Digests are always disabled during login phase. 1665 */ 1666 is->is_conn->ic_header_crc32c = false; 1667 is->is_conn->ic_data_crc32c = false; 1668 1669 return (error); 1670 } 1671 1672 static int 1673 iscsi_ioctl_daemon_send(struct iscsi_softc *sc, 1674 struct iscsi_daemon_send *ids) 1675 { 1676 struct iscsi_session *is; 1677 struct icl_pdu *ip; 1678 size_t datalen; 1679 void *data; 1680 int error; 1681 1682 sx_slock(&sc->sc_lock); 1683 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1684 if (is->is_id == ids->ids_session_id) 1685 break; 1686 } 1687 if (is == NULL) { 1688 sx_sunlock(&sc->sc_lock); 1689 return (ESRCH); 1690 } 1691 sx_sunlock(&sc->sc_lock); 1692 1693 if (is->is_login_phase == false) 1694 return (EBUSY); 1695 1696 if (is->is_terminating || is->is_reconnecting) 1697 return (EIO); 1698 1699 datalen = ids->ids_data_segment_len; 1700 if (datalen > is->is_conn->ic_max_send_data_segment_length) 1701 return (EINVAL); 1702 if (datalen > 0) { 1703 data = malloc(datalen, M_ISCSI, M_WAITOK); 1704 error = copyin(ids->ids_data_segment, data, datalen); 1705 if (error != 0) { 1706 free(data, M_ISCSI); 1707 return (error); 1708 } 1709 } 1710 1711 ip = icl_pdu_new(is->is_conn, M_WAITOK); 1712 memcpy(ip->ip_bhs, ids->ids_bhs, sizeof(*ip->ip_bhs)); 1713 if (datalen > 0) { 1714 error = icl_pdu_append_data(ip, data, datalen, M_WAITOK); 1715 KASSERT(error == 0, ("icl_pdu_append_data(..., M_WAITOK) failed")); 1716 free(data, M_ISCSI); 1717 } 1718 iscsi_pdu_queue(ip); 1719 1720 return (0); 1721 } 1722 1723 static int 1724 iscsi_ioctl_daemon_receive(struct iscsi_softc *sc, 1725 struct iscsi_daemon_receive *idr) 1726 { 1727 struct iscsi_session *is; 1728 struct icl_pdu *ip; 1729 void *data; 1730 int error; 1731 1732 sx_slock(&sc->sc_lock); 1733 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1734 if (is->is_id == idr->idr_session_id) 1735 break; 1736 } 1737 if (is == NULL) { 1738 sx_sunlock(&sc->sc_lock); 1739 return (ESRCH); 1740 } 1741 sx_sunlock(&sc->sc_lock); 1742 1743 if (is->is_login_phase == false) 1744 return (EBUSY); 1745 1746 ISCSI_SESSION_LOCK(is); 1747 while (is->is_login_pdu == NULL && 1748 is->is_terminating == false && 1749 is->is_reconnecting == false) { 1750 error = cv_wait_sig(&is->is_login_cv, &is->is_lock); 1751 if (error != 0) { 1752 ISCSI_SESSION_UNLOCK(is); 1753 return (error); 1754 } 1755 } 1756 if (is->is_terminating || is->is_reconnecting) { 1757 ISCSI_SESSION_UNLOCK(is); 1758 return (EIO); 1759 } 1760 ip = is->is_login_pdu; 1761 is->is_login_pdu = NULL; 1762 ISCSI_SESSION_UNLOCK(is); 1763 1764 if (ip->ip_data_len > idr->idr_data_segment_len) { 1765 icl_pdu_free(ip); 1766 return (EMSGSIZE); 1767 } 1768 1769 copyout(ip->ip_bhs, idr->idr_bhs, sizeof(*ip->ip_bhs)); 1770 if (ip->ip_data_len > 0) { 1771 data = malloc(ip->ip_data_len, M_ISCSI, M_WAITOK); 1772 icl_pdu_get_data(ip, 0, data, ip->ip_data_len); 1773 copyout(data, idr->idr_data_segment, ip->ip_data_len); 1774 free(data, M_ISCSI); 1775 } 1776 1777 icl_pdu_free(ip); 1778 1779 return (0); 1780 } 1781 #endif /* ICL_KERNEL_PROXY */ 1782 1783 static void 1784 iscsi_sanitize_session_conf(struct iscsi_session_conf *isc) 1785 { 1786 /* 1787 * Just make sure all the fields are null-terminated. 1788 * 1789 * XXX: This is not particularly secure. We should 1790 * create our own conf and then copy in relevant 1791 * fields. 1792 */ 1793 isc->isc_initiator[ISCSI_NAME_LEN - 1] = '\0'; 1794 isc->isc_initiator_addr[ISCSI_ADDR_LEN - 1] = '\0'; 1795 isc->isc_initiator_alias[ISCSI_ALIAS_LEN - 1] = '\0'; 1796 isc->isc_target[ISCSI_NAME_LEN - 1] = '\0'; 1797 isc->isc_target_addr[ISCSI_ADDR_LEN - 1] = '\0'; 1798 isc->isc_user[ISCSI_NAME_LEN - 1] = '\0'; 1799 isc->isc_secret[ISCSI_SECRET_LEN - 1] = '\0'; 1800 isc->isc_mutual_user[ISCSI_NAME_LEN - 1] = '\0'; 1801 isc->isc_mutual_secret[ISCSI_SECRET_LEN - 1] = '\0'; 1802 } 1803 1804 static bool 1805 iscsi_valid_session_conf(const struct iscsi_session_conf *isc) 1806 { 1807 1808 if (isc->isc_initiator[0] == '\0') { 1809 ISCSI_DEBUG("empty isc_initiator"); 1810 return (false); 1811 } 1812 1813 if (isc->isc_target_addr[0] == '\0') { 1814 ISCSI_DEBUG("empty isc_target_addr"); 1815 return (false); 1816 } 1817 1818 if (isc->isc_discovery != 0 && isc->isc_target[0] != 0) { 1819 ISCSI_DEBUG("non-empty isc_target for discovery session"); 1820 return (false); 1821 } 1822 1823 if (isc->isc_discovery == 0 && isc->isc_target[0] == 0) { 1824 ISCSI_DEBUG("empty isc_target for non-discovery session"); 1825 return (false); 1826 } 1827 1828 return (true); 1829 } 1830 1831 static int 1832 iscsi_ioctl_session_add(struct iscsi_softc *sc, struct iscsi_session_add *isa) 1833 { 1834 struct iscsi_session *is; 1835 const struct iscsi_session *is2; 1836 int error; 1837 1838 iscsi_sanitize_session_conf(&isa->isa_conf); 1839 if (iscsi_valid_session_conf(&isa->isa_conf) == false) 1840 return (EINVAL); 1841 1842 is = malloc(sizeof(*is), M_ISCSI, M_ZERO | M_WAITOK); 1843 memcpy(&is->is_conf, &isa->isa_conf, sizeof(is->is_conf)); 1844 1845 sx_xlock(&sc->sc_lock); 1846 1847 /* 1848 * Prevent duplicates. 1849 */ 1850 TAILQ_FOREACH(is2, &sc->sc_sessions, is_next) { 1851 if (!!is->is_conf.isc_discovery != 1852 !!is2->is_conf.isc_discovery) 1853 continue; 1854 1855 if (strcmp(is->is_conf.isc_target_addr, 1856 is2->is_conf.isc_target_addr) != 0) 1857 continue; 1858 1859 if (is->is_conf.isc_discovery == 0 && 1860 strcmp(is->is_conf.isc_target, 1861 is2->is_conf.isc_target) != 0) 1862 continue; 1863 1864 sx_xunlock(&sc->sc_lock); 1865 free(is, M_ISCSI); 1866 return (EBUSY); 1867 } 1868 1869 is->is_conn = icl_new_conn(is->is_conf.isc_offload, 1870 is->is_conf.isc_iser, "iscsi", &is->is_lock); 1871 if (is->is_conn == NULL) { 1872 sx_xunlock(&sc->sc_lock); 1873 free(is, M_ISCSI); 1874 return (EINVAL); 1875 } 1876 is->is_conn->ic_receive = iscsi_receive_callback; 1877 is->is_conn->ic_error = iscsi_error_callback; 1878 is->is_conn->ic_prv0 = is; 1879 TAILQ_INIT(&is->is_outstanding); 1880 STAILQ_INIT(&is->is_postponed); 1881 mtx_init(&is->is_lock, "iscsi_lock", NULL, MTX_DEF); 1882 cv_init(&is->is_maintenance_cv, "iscsi_mt"); 1883 #ifdef ICL_KERNEL_PROXY 1884 cv_init(&is->is_login_cv, "iscsi_login"); 1885 #endif 1886 1887 /* 1888 * Set some default values, from RFC 3720, section 12. 1889 * 1890 * These values are updated by the handoff IOCTL, but are 1891 * needed prior to the handoff to support sending the ISER 1892 * login PDU. 1893 */ 1894 is->is_conn->ic_max_recv_data_segment_length = 8192; 1895 is->is_conn->ic_max_send_data_segment_length = 8192; 1896 is->is_max_burst_length = 262144; 1897 is->is_first_burst_length = 65536; 1898 1899 is->is_softc = sc; 1900 sc->sc_last_session_id++; 1901 is->is_id = sc->sc_last_session_id; 1902 is->is_isid[0] = 0x80; /* RFC 3720, 10.12.5: 10b, "Random" ISID. */ 1903 arc4rand(&is->is_isid[1], 5, 0); 1904 is->is_tsih = 0; 1905 callout_init(&is->is_callout, 1); 1906 1907 error = kthread_add(iscsi_maintenance_thread, is, NULL, NULL, 0, 0, "iscsimt"); 1908 if (error != 0) { 1909 ISCSI_SESSION_WARN(is, "kthread_add(9) failed with error %d", error); 1910 sx_xunlock(&sc->sc_lock); 1911 return (error); 1912 } 1913 1914 callout_reset(&is->is_callout, 1 * hz, iscsi_callout, is); 1915 TAILQ_INSERT_TAIL(&sc->sc_sessions, is, is_next); 1916 1917 ISCSI_SESSION_LOCK(is); 1918 /* 1919 * Don't notify iscsid(8) if the session is disabled and it's not 1920 * a discovery session, 1921 */ 1922 if (is->is_conf.isc_enable == 0 && is->is_conf.isc_discovery == 0) { 1923 ISCSI_SESSION_UNLOCK(is); 1924 sx_xunlock(&sc->sc_lock); 1925 return (0); 1926 } 1927 1928 is->is_waiting_for_iscsid = true; 1929 strlcpy(is->is_reason, "Waiting for iscsid(8)", sizeof(is->is_reason)); 1930 ISCSI_SESSION_UNLOCK(is); 1931 cv_signal(&sc->sc_cv); 1932 sx_xunlock(&sc->sc_lock); 1933 return (0); 1934 } 1935 1936 static bool 1937 iscsi_session_conf_matches(unsigned int id1, const struct iscsi_session_conf *c1, 1938 unsigned int id2, const struct iscsi_session_conf *c2) 1939 { 1940 1941 if (id2 != 0 && id2 != id1) 1942 return (false); 1943 if (c2->isc_target[0] != '\0' && 1944 strcmp(c1->isc_target, c2->isc_target) != 0) 1945 return (false); 1946 if (c2->isc_target_addr[0] != '\0' && 1947 strcmp(c1->isc_target_addr, c2->isc_target_addr) != 0) 1948 return (false); 1949 return (true); 1950 } 1951 1952 static int 1953 iscsi_ioctl_session_remove(struct iscsi_softc *sc, 1954 struct iscsi_session_remove *isr) 1955 { 1956 struct iscsi_session *is, *tmp; 1957 bool found = false; 1958 1959 iscsi_sanitize_session_conf(&isr->isr_conf); 1960 1961 sx_xlock(&sc->sc_lock); 1962 TAILQ_FOREACH_SAFE(is, &sc->sc_sessions, is_next, tmp) { 1963 ISCSI_SESSION_LOCK(is); 1964 if (iscsi_session_conf_matches(is->is_id, &is->is_conf, 1965 isr->isr_session_id, &isr->isr_conf)) { 1966 found = true; 1967 iscsi_session_logout(is); 1968 iscsi_session_terminate(is); 1969 } 1970 ISCSI_SESSION_UNLOCK(is); 1971 } 1972 sx_xunlock(&sc->sc_lock); 1973 1974 if (!found) 1975 return (ESRCH); 1976 1977 return (0); 1978 } 1979 1980 static int 1981 iscsi_ioctl_session_list(struct iscsi_softc *sc, struct iscsi_session_list *isl) 1982 { 1983 int error; 1984 unsigned int i = 0; 1985 struct iscsi_session *is; 1986 struct iscsi_session_state iss; 1987 1988 sx_slock(&sc->sc_lock); 1989 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1990 if (i >= isl->isl_nentries) { 1991 sx_sunlock(&sc->sc_lock); 1992 return (EMSGSIZE); 1993 } 1994 memset(&iss, 0, sizeof(iss)); 1995 memcpy(&iss.iss_conf, &is->is_conf, sizeof(iss.iss_conf)); 1996 iss.iss_id = is->is_id; 1997 strlcpy(iss.iss_target_alias, is->is_target_alias, sizeof(iss.iss_target_alias)); 1998 strlcpy(iss.iss_reason, is->is_reason, sizeof(iss.iss_reason)); 1999 strlcpy(iss.iss_offload, is->is_conn->ic_offload, sizeof(iss.iss_offload)); 2000 2001 if (is->is_conn->ic_header_crc32c) 2002 iss.iss_header_digest = ISCSI_DIGEST_CRC32C; 2003 else 2004 iss.iss_header_digest = ISCSI_DIGEST_NONE; 2005 2006 if (is->is_conn->ic_data_crc32c) 2007 iss.iss_data_digest = ISCSI_DIGEST_CRC32C; 2008 else 2009 iss.iss_data_digest = ISCSI_DIGEST_NONE; 2010 2011 iss.iss_max_send_data_segment_length = 2012 is->is_conn->ic_max_send_data_segment_length; 2013 iss.iss_max_recv_data_segment_length = 2014 is->is_conn->ic_max_recv_data_segment_length; 2015 iss.iss_max_burst_length = is->is_max_burst_length; 2016 iss.iss_first_burst_length = is->is_first_burst_length; 2017 iss.iss_immediate_data = is->is_immediate_data; 2018 iss.iss_connected = is->is_connected; 2019 2020 error = copyout(&iss, isl->isl_pstates + i, sizeof(iss)); 2021 if (error != 0) { 2022 sx_sunlock(&sc->sc_lock); 2023 return (error); 2024 } 2025 i++; 2026 } 2027 sx_sunlock(&sc->sc_lock); 2028 2029 isl->isl_nentries = i; 2030 2031 return (0); 2032 } 2033 2034 static int 2035 iscsi_ioctl_session_modify(struct iscsi_softc *sc, 2036 struct iscsi_session_modify *ism) 2037 { 2038 struct iscsi_session *is; 2039 const struct iscsi_session *is2; 2040 2041 iscsi_sanitize_session_conf(&ism->ism_conf); 2042 if (iscsi_valid_session_conf(&ism->ism_conf) == false) 2043 return (EINVAL); 2044 2045 sx_xlock(&sc->sc_lock); 2046 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 2047 ISCSI_SESSION_LOCK(is); 2048 if (is->is_id == ism->ism_session_id) { 2049 /* Note that the session remains locked. */ 2050 break; 2051 } 2052 ISCSI_SESSION_UNLOCK(is); 2053 } 2054 if (is == NULL) { 2055 sx_xunlock(&sc->sc_lock); 2056 return (ESRCH); 2057 } 2058 2059 /* 2060 * Prevent duplicates. 2061 */ 2062 TAILQ_FOREACH(is2, &sc->sc_sessions, is_next) { 2063 if (is == is2) 2064 continue; 2065 2066 if (!!ism->ism_conf.isc_discovery != 2067 !!is2->is_conf.isc_discovery) 2068 continue; 2069 2070 if (strcmp(ism->ism_conf.isc_target_addr, 2071 is2->is_conf.isc_target_addr) != 0) 2072 continue; 2073 2074 if (ism->ism_conf.isc_discovery == 0 && 2075 strcmp(ism->ism_conf.isc_target, 2076 is2->is_conf.isc_target) != 0) 2077 continue; 2078 2079 ISCSI_SESSION_UNLOCK(is); 2080 sx_xunlock(&sc->sc_lock); 2081 return (EBUSY); 2082 } 2083 2084 sx_xunlock(&sc->sc_lock); 2085 2086 memcpy(&is->is_conf, &ism->ism_conf, sizeof(is->is_conf)); 2087 ISCSI_SESSION_UNLOCK(is); 2088 2089 iscsi_session_reconnect(is); 2090 2091 return (0); 2092 } 2093 2094 static int 2095 iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, int mode, 2096 struct thread *td) 2097 { 2098 struct iscsi_softc *sc; 2099 2100 sc = dev->si_drv1; 2101 2102 switch (cmd) { 2103 case ISCSIDWAIT: 2104 return (iscsi_ioctl_daemon_wait(sc, 2105 (struct iscsi_daemon_request *)arg)); 2106 case ISCSIDHANDOFF: 2107 return (iscsi_ioctl_daemon_handoff(sc, 2108 (struct iscsi_daemon_handoff *)arg)); 2109 case ISCSIDFAIL: 2110 return (iscsi_ioctl_daemon_fail(sc, 2111 (struct iscsi_daemon_fail *)arg)); 2112 #ifdef ICL_KERNEL_PROXY 2113 case ISCSIDCONNECT: 2114 return (iscsi_ioctl_daemon_connect(sc, 2115 (struct iscsi_daemon_connect *)arg)); 2116 case ISCSIDSEND: 2117 return (iscsi_ioctl_daemon_send(sc, 2118 (struct iscsi_daemon_send *)arg)); 2119 case ISCSIDRECEIVE: 2120 return (iscsi_ioctl_daemon_receive(sc, 2121 (struct iscsi_daemon_receive *)arg)); 2122 #endif /* ICL_KERNEL_PROXY */ 2123 case ISCSISADD: 2124 return (iscsi_ioctl_session_add(sc, 2125 (struct iscsi_session_add *)arg)); 2126 case ISCSISREMOVE: 2127 return (iscsi_ioctl_session_remove(sc, 2128 (struct iscsi_session_remove *)arg)); 2129 case ISCSISLIST: 2130 return (iscsi_ioctl_session_list(sc, 2131 (struct iscsi_session_list *)arg)); 2132 case ISCSISMODIFY: 2133 return (iscsi_ioctl_session_modify(sc, 2134 (struct iscsi_session_modify *)arg)); 2135 default: 2136 return (EINVAL); 2137 } 2138 } 2139 2140 static struct iscsi_outstanding * 2141 iscsi_outstanding_find(struct iscsi_session *is, uint32_t initiator_task_tag) 2142 { 2143 struct iscsi_outstanding *io; 2144 2145 ISCSI_SESSION_LOCK_ASSERT(is); 2146 2147 TAILQ_FOREACH(io, &is->is_outstanding, io_next) { 2148 if (io->io_initiator_task_tag == initiator_task_tag) 2149 return (io); 2150 } 2151 return (NULL); 2152 } 2153 2154 static struct iscsi_outstanding * 2155 iscsi_outstanding_find_ccb(struct iscsi_session *is, union ccb *ccb) 2156 { 2157 struct iscsi_outstanding *io; 2158 2159 ISCSI_SESSION_LOCK_ASSERT(is); 2160 2161 TAILQ_FOREACH(io, &is->is_outstanding, io_next) { 2162 if (io->io_ccb == ccb) 2163 return (io); 2164 } 2165 return (NULL); 2166 } 2167 2168 static struct iscsi_outstanding * 2169 iscsi_outstanding_add(struct iscsi_session *is, struct icl_pdu *request, 2170 union ccb *ccb, uint32_t *initiator_task_tagp) 2171 { 2172 struct iscsi_outstanding *io; 2173 int error; 2174 2175 ISCSI_SESSION_LOCK_ASSERT(is); 2176 2177 io = uma_zalloc(iscsi_outstanding_zone, M_NOWAIT | M_ZERO); 2178 if (io == NULL) { 2179 ISCSI_SESSION_WARN(is, "failed to allocate %zd bytes", 2180 sizeof(*io)); 2181 return (NULL); 2182 } 2183 2184 error = icl_conn_task_setup(is->is_conn, request, &ccb->csio, 2185 initiator_task_tagp, &io->io_icl_prv); 2186 if (error != 0) { 2187 ISCSI_SESSION_WARN(is, 2188 "icl_conn_task_setup() failed with error %d", error); 2189 uma_zfree(iscsi_outstanding_zone, io); 2190 return (NULL); 2191 } 2192 2193 KASSERT(iscsi_outstanding_find(is, *initiator_task_tagp) == NULL, 2194 ("initiator_task_tag 0x%x already added", *initiator_task_tagp)); 2195 2196 io->io_initiator_task_tag = *initiator_task_tagp; 2197 io->io_ccb = ccb; 2198 TAILQ_INSERT_TAIL(&is->is_outstanding, io, io_next); 2199 return (io); 2200 } 2201 2202 static void 2203 iscsi_outstanding_remove(struct iscsi_session *is, struct iscsi_outstanding *io) 2204 { 2205 2206 ISCSI_SESSION_LOCK_ASSERT(is); 2207 2208 icl_conn_task_done(is->is_conn, io->io_icl_prv); 2209 TAILQ_REMOVE(&is->is_outstanding, io, io_next); 2210 uma_zfree(iscsi_outstanding_zone, io); 2211 } 2212 2213 static void 2214 iscsi_action_abort(struct iscsi_session *is, union ccb *ccb) 2215 { 2216 struct icl_pdu *request; 2217 struct iscsi_bhs_task_management_request *bhstmr; 2218 struct ccb_abort *cab = &ccb->cab; 2219 struct iscsi_outstanding *io, *aio; 2220 uint32_t initiator_task_tag; 2221 2222 ISCSI_SESSION_LOCK_ASSERT(is); 2223 2224 #if 0 2225 KASSERT(is->is_login_phase == false, ("%s called during Login Phase", __func__)); 2226 #else 2227 if (is->is_login_phase) { 2228 ccb->ccb_h.status = CAM_REQ_ABORTED; 2229 xpt_done(ccb); 2230 return; 2231 } 2232 #endif 2233 2234 aio = iscsi_outstanding_find_ccb(is, cab->abort_ccb); 2235 if (aio == NULL) { 2236 ccb->ccb_h.status = CAM_REQ_CMP; 2237 xpt_done(ccb); 2238 return; 2239 } 2240 2241 request = icl_pdu_new(is->is_conn, M_NOWAIT); 2242 if (request == NULL) { 2243 ccb->ccb_h.status = CAM_RESRC_UNAVAIL; 2244 xpt_done(ccb); 2245 return; 2246 } 2247 2248 initiator_task_tag = is->is_initiator_task_tag++; 2249 if (initiator_task_tag == 0xffffffff) 2250 initiator_task_tag = is->is_initiator_task_tag++; 2251 2252 io = iscsi_outstanding_add(is, request, NULL, &initiator_task_tag); 2253 if (io == NULL) { 2254 icl_pdu_free(request); 2255 ccb->ccb_h.status = CAM_RESRC_UNAVAIL; 2256 xpt_done(ccb); 2257 return; 2258 } 2259 io->io_referenced_task_tag = aio->io_initiator_task_tag; 2260 2261 bhstmr = (struct iscsi_bhs_task_management_request *)request->ip_bhs; 2262 bhstmr->bhstmr_opcode = ISCSI_BHS_OPCODE_TASK_REQUEST; 2263 bhstmr->bhstmr_function = 0x80 | BHSTMR_FUNCTION_ABORT_TASK; 2264 bhstmr->bhstmr_lun = htobe64(CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun)); 2265 bhstmr->bhstmr_initiator_task_tag = initiator_task_tag; 2266 bhstmr->bhstmr_referenced_task_tag = aio->io_initiator_task_tag; 2267 2268 iscsi_pdu_queue_locked(request); 2269 } 2270 2271 static void 2272 iscsi_action_scsiio(struct iscsi_session *is, union ccb *ccb) 2273 { 2274 struct icl_pdu *request; 2275 struct iscsi_bhs_scsi_command *bhssc; 2276 struct ccb_scsiio *csio; 2277 struct iscsi_outstanding *io; 2278 size_t len; 2279 uint32_t initiator_task_tag; 2280 int error; 2281 2282 ISCSI_SESSION_LOCK_ASSERT(is); 2283 2284 #if 0 2285 KASSERT(is->is_login_phase == false, ("%s called during Login Phase", __func__)); 2286 #else 2287 if (is->is_login_phase) { 2288 ISCSI_SESSION_DEBUG(is, "called during login phase"); 2289 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 2290 xpt_freeze_devq(ccb->ccb_h.path, 1); 2291 ISCSI_SESSION_DEBUG(is, "freezing devq"); 2292 } 2293 ccb->ccb_h.status = CAM_REQ_ABORTED | CAM_DEV_QFRZN; 2294 xpt_done(ccb); 2295 return; 2296 } 2297 #endif 2298 2299 request = icl_pdu_new(is->is_conn, M_NOWAIT); 2300 if (request == NULL) { 2301 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 2302 xpt_freeze_devq(ccb->ccb_h.path, 1); 2303 ISCSI_SESSION_DEBUG(is, "freezing devq"); 2304 } 2305 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN; 2306 xpt_done(ccb); 2307 return; 2308 } 2309 2310 initiator_task_tag = is->is_initiator_task_tag++; 2311 if (initiator_task_tag == 0xffffffff) 2312 initiator_task_tag = is->is_initiator_task_tag++; 2313 2314 io = iscsi_outstanding_add(is, request, ccb, &initiator_task_tag); 2315 if (io == NULL) { 2316 icl_pdu_free(request); 2317 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 2318 xpt_freeze_devq(ccb->ccb_h.path, 1); 2319 ISCSI_SESSION_DEBUG(is, "freezing devq"); 2320 } 2321 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN; 2322 xpt_done(ccb); 2323 return; 2324 } 2325 2326 csio = &ccb->csio; 2327 bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs; 2328 bhssc->bhssc_opcode = ISCSI_BHS_OPCODE_SCSI_COMMAND; 2329 bhssc->bhssc_flags |= BHSSC_FLAGS_F; 2330 switch (csio->ccb_h.flags & CAM_DIR_MASK) { 2331 case CAM_DIR_IN: 2332 bhssc->bhssc_flags |= BHSSC_FLAGS_R; 2333 break; 2334 case CAM_DIR_OUT: 2335 bhssc->bhssc_flags |= BHSSC_FLAGS_W; 2336 break; 2337 } 2338 2339 if ((ccb->ccb_h.flags & CAM_TAG_ACTION_VALID) != 0) { 2340 switch (csio->tag_action) { 2341 case MSG_HEAD_OF_Q_TAG: 2342 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_HOQ; 2343 break; 2344 case MSG_ORDERED_Q_TAG: 2345 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_ORDERED; 2346 break; 2347 case MSG_ACA_TASK: 2348 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_ACA; 2349 break; 2350 case MSG_SIMPLE_Q_TAG: 2351 default: 2352 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_SIMPLE; 2353 break; 2354 } 2355 } else 2356 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_UNTAGGED; 2357 2358 if (is->is_protocol_level >= 2) { 2359 bhssc->bhssc_pri = (csio->priority << BHSSC_PRI_SHIFT) & 2360 BHSSC_PRI_MASK; 2361 } 2362 2363 bhssc->bhssc_lun = htobe64(CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun)); 2364 bhssc->bhssc_initiator_task_tag = initiator_task_tag; 2365 bhssc->bhssc_expected_data_transfer_length = htonl(csio->dxfer_len); 2366 KASSERT(csio->cdb_len <= sizeof(bhssc->bhssc_cdb), 2367 ("unsupported CDB size %zd", (size_t)csio->cdb_len)); 2368 2369 if (csio->ccb_h.flags & CAM_CDB_POINTER) 2370 memcpy(&bhssc->bhssc_cdb, csio->cdb_io.cdb_ptr, csio->cdb_len); 2371 else 2372 memcpy(&bhssc->bhssc_cdb, csio->cdb_io.cdb_bytes, csio->cdb_len); 2373 2374 if (is->is_immediate_data && 2375 (csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT) { 2376 len = csio->dxfer_len; 2377 //ISCSI_SESSION_DEBUG(is, "adding %zd of immediate data", len); 2378 if (len > is->is_first_burst_length) { 2379 ISCSI_SESSION_DEBUG(is, "len %zd -> %d", len, is->is_first_burst_length); 2380 len = is->is_first_burst_length; 2381 } 2382 if (len > is->is_conn->ic_max_send_data_segment_length) { 2383 ISCSI_SESSION_DEBUG(is, "len %zd -> %d", len, 2384 is->is_conn->ic_max_send_data_segment_length); 2385 len = is->is_conn->ic_max_send_data_segment_length; 2386 } 2387 2388 error = icl_pdu_append_data(request, csio->data_ptr, len, M_NOWAIT); 2389 if (error != 0) { 2390 iscsi_outstanding_remove(is, io); 2391 icl_pdu_free(request); 2392 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 2393 xpt_freeze_devq(ccb->ccb_h.path, 1); 2394 ISCSI_SESSION_DEBUG(is, "freezing devq"); 2395 } 2396 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN; 2397 xpt_done(ccb); 2398 return; 2399 } 2400 } 2401 iscsi_pdu_queue_locked(request); 2402 } 2403 2404 static void 2405 iscsi_action(struct cam_sim *sim, union ccb *ccb) 2406 { 2407 struct iscsi_session *is; 2408 2409 is = cam_sim_softc(sim); 2410 2411 ISCSI_SESSION_LOCK_ASSERT(is); 2412 2413 if (is->is_terminating || 2414 (is->is_connected == false && fail_on_disconnection)) { 2415 ccb->ccb_h.status = CAM_DEV_NOT_THERE; 2416 xpt_done(ccb); 2417 return; 2418 } 2419 2420 /* 2421 * Make sure CAM doesn't sneak in a CCB just after freezing the queue. 2422 */ 2423 if (is->is_simq_frozen == true) { 2424 ccb->ccb_h.status &= ~(CAM_SIM_QUEUED | CAM_STATUS_MASK); 2425 ccb->ccb_h.status |= CAM_REQUEUE_REQ; 2426 /* Don't freeze the devq - the SIM queue is already frozen. */ 2427 xpt_done(ccb); 2428 return; 2429 } 2430 2431 switch (ccb->ccb_h.func_code) { 2432 case XPT_PATH_INQ: 2433 { 2434 struct ccb_pathinq *cpi = &ccb->cpi; 2435 2436 cpi->version_num = 1; 2437 cpi->hba_inquiry = PI_TAG_ABLE; 2438 cpi->target_sprt = 0; 2439 cpi->hba_misc = PIM_EXTLUNS; 2440 /* 2441 * XXX: It shouldn't ever be NULL; this could be turned 2442 * into a KASSERT eventually. 2443 */ 2444 if (is->is_conn == NULL) 2445 ISCSI_WARN("NULL conn"); 2446 else if (is->is_conn->ic_unmapped) 2447 cpi->hba_misc |= PIM_UNMAPPED; 2448 cpi->hba_eng_cnt = 0; 2449 cpi->max_target = 0; 2450 /* 2451 * Note that the variable below is only relevant for targets 2452 * that don't claim compliance with anything above SPC2, which 2453 * means they don't support REPORT_LUNS. 2454 */ 2455 cpi->max_lun = 255; 2456 cpi->initiator_id = ~0; 2457 strlcpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN); 2458 strlcpy(cpi->hba_vid, "iSCSI", HBA_IDLEN); 2459 strlcpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN); 2460 cpi->unit_number = cam_sim_unit(sim); 2461 cpi->bus_id = cam_sim_bus(sim); 2462 cpi->base_transfer_speed = 150000; /* XXX */ 2463 cpi->transport = XPORT_ISCSI; 2464 cpi->transport_version = 0; 2465 cpi->protocol = PROTO_SCSI; 2466 cpi->protocol_version = SCSI_REV_SPC3; 2467 cpi->maxio = maxphys; 2468 cpi->ccb_h.status = CAM_REQ_CMP; 2469 break; 2470 } 2471 case XPT_GET_TRAN_SETTINGS: 2472 { 2473 struct ccb_trans_settings *cts; 2474 struct ccb_trans_settings_scsi *scsi; 2475 2476 cts = &ccb->cts; 2477 scsi = &cts->proto_specific.scsi; 2478 2479 cts->protocol = PROTO_SCSI; 2480 cts->protocol_version = SCSI_REV_SPC3; 2481 cts->transport = XPORT_ISCSI; 2482 cts->transport_version = 0; 2483 scsi->valid = CTS_SCSI_VALID_TQ; 2484 scsi->flags = CTS_SCSI_FLAGS_TAG_ENB; 2485 cts->ccb_h.status = CAM_REQ_CMP; 2486 break; 2487 } 2488 case XPT_CALC_GEOMETRY: 2489 cam_calc_geometry(&ccb->ccg, /*extended*/1); 2490 ccb->ccb_h.status = CAM_REQ_CMP; 2491 break; 2492 #if 0 2493 /* 2494 * XXX: What's the point? 2495 */ 2496 case XPT_RESET_BUS: 2497 case XPT_TERM_IO: 2498 ISCSI_SESSION_DEBUG(is, "faking success for reset, abort, or term_io"); 2499 ccb->ccb_h.status = CAM_REQ_CMP; 2500 break; 2501 #endif 2502 case XPT_ABORT: 2503 iscsi_action_abort(is, ccb); 2504 return; 2505 case XPT_SCSI_IO: 2506 iscsi_action_scsiio(is, ccb); 2507 return; 2508 default: 2509 #if 0 2510 ISCSI_SESSION_DEBUG(is, "got unsupported code 0x%x", ccb->ccb_h.func_code); 2511 #endif 2512 ccb->ccb_h.status = CAM_FUNC_NOTAVAIL; 2513 break; 2514 } 2515 xpt_done(ccb); 2516 } 2517 2518 static void 2519 iscsi_terminate_sessions(struct iscsi_softc *sc) 2520 { 2521 struct iscsi_session *is; 2522 2523 sx_slock(&sc->sc_lock); 2524 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) 2525 iscsi_session_terminate(is); 2526 while(!TAILQ_EMPTY(&sc->sc_sessions)) { 2527 ISCSI_DEBUG("waiting for sessions to terminate"); 2528 cv_wait(&sc->sc_cv, &sc->sc_lock); 2529 } 2530 ISCSI_DEBUG("all sessions terminated"); 2531 sx_sunlock(&sc->sc_lock); 2532 } 2533 2534 static void 2535 iscsi_shutdown_pre(struct iscsi_softc *sc) 2536 { 2537 struct iscsi_session *is; 2538 2539 if (!fail_on_shutdown) 2540 return; 2541 2542 /* 2543 * If we have any sessions waiting for reconnection, request 2544 * maintenance thread to fail them immediately instead of waiting 2545 * for reconnect timeout. 2546 * 2547 * This prevents LUNs with mounted filesystems that are supported 2548 * by disconnected iSCSI sessions from hanging, however it will 2549 * fail all queued BIOs. 2550 */ 2551 ISCSI_DEBUG("forcing failing all disconnected sessions due to shutdown"); 2552 2553 fail_on_disconnection = 1; 2554 2555 sx_slock(&sc->sc_lock); 2556 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 2557 ISCSI_SESSION_LOCK(is); 2558 if (!is->is_connected) { 2559 ISCSI_SESSION_DEBUG(is, "force failing disconnected session early"); 2560 iscsi_session_reconnect(is); 2561 } 2562 ISCSI_SESSION_UNLOCK(is); 2563 } 2564 sx_sunlock(&sc->sc_lock); 2565 } 2566 2567 static void 2568 iscsi_shutdown_post(struct iscsi_softc *sc) 2569 { 2570 2571 if (!KERNEL_PANICKED()) { 2572 ISCSI_DEBUG("removing all sessions due to shutdown"); 2573 iscsi_terminate_sessions(sc); 2574 } 2575 } 2576 2577 static int 2578 iscsi_load(void) 2579 { 2580 int error; 2581 2582 sc = malloc(sizeof(*sc), M_ISCSI, M_ZERO | M_WAITOK); 2583 sx_init(&sc->sc_lock, "iscsi"); 2584 TAILQ_INIT(&sc->sc_sessions); 2585 cv_init(&sc->sc_cv, "iscsi_cv"); 2586 2587 iscsi_outstanding_zone = uma_zcreate("iscsi_outstanding", 2588 sizeof(struct iscsi_outstanding), NULL, NULL, NULL, NULL, 2589 UMA_ALIGN_PTR, 0); 2590 2591 error = make_dev_p(MAKEDEV_CHECKNAME, &sc->sc_cdev, &iscsi_cdevsw, 2592 NULL, UID_ROOT, GID_WHEEL, 0600, "iscsi"); 2593 if (error != 0) { 2594 ISCSI_WARN("failed to create device node, error %d", error); 2595 return (error); 2596 } 2597 sc->sc_cdev->si_drv1 = sc; 2598 2599 sc->sc_shutdown_pre_eh = EVENTHANDLER_REGISTER(shutdown_pre_sync, 2600 iscsi_shutdown_pre, sc, SHUTDOWN_PRI_FIRST); 2601 /* 2602 * shutdown_post_sync needs to run after filesystem shutdown and before 2603 * CAM shutdown - otherwise when rebooting with an iSCSI session that is 2604 * disconnected but has outstanding requests, dashutdown() will hang on 2605 * cam_periph_runccb(). 2606 */ 2607 sc->sc_shutdown_post_eh = EVENTHANDLER_REGISTER(shutdown_post_sync, 2608 iscsi_shutdown_post, sc, SHUTDOWN_PRI_DEFAULT - 1); 2609 2610 return (0); 2611 } 2612 2613 static int 2614 iscsi_unload(void) 2615 { 2616 2617 /* Awaken any threads asleep in iscsi_ioctl(). */ 2618 sx_xlock(&sc->sc_lock); 2619 sc->sc_unloading = true; 2620 cv_signal(&sc->sc_cv); 2621 sx_xunlock(&sc->sc_lock); 2622 2623 if (sc->sc_cdev != NULL) { 2624 ISCSI_DEBUG("removing device node"); 2625 destroy_dev(sc->sc_cdev); 2626 ISCSI_DEBUG("device node removed"); 2627 } 2628 2629 if (sc->sc_shutdown_pre_eh != NULL) 2630 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, sc->sc_shutdown_pre_eh); 2631 if (sc->sc_shutdown_post_eh != NULL) 2632 EVENTHANDLER_DEREGISTER(shutdown_post_sync, sc->sc_shutdown_post_eh); 2633 2634 iscsi_terminate_sessions(sc); 2635 2636 uma_zdestroy(iscsi_outstanding_zone); 2637 sx_destroy(&sc->sc_lock); 2638 cv_destroy(&sc->sc_cv); 2639 free(sc, M_ISCSI); 2640 return (0); 2641 } 2642 2643 static int 2644 iscsi_quiesce(void) 2645 { 2646 sx_slock(&sc->sc_lock); 2647 if (!TAILQ_EMPTY(&sc->sc_sessions)) { 2648 sx_sunlock(&sc->sc_lock); 2649 return (EBUSY); 2650 } 2651 sx_sunlock(&sc->sc_lock); 2652 return (0); 2653 } 2654 2655 static int 2656 iscsi_modevent(module_t mod, int what, void *arg) 2657 { 2658 int error; 2659 2660 switch (what) { 2661 case MOD_LOAD: 2662 error = iscsi_load(); 2663 break; 2664 case MOD_UNLOAD: 2665 error = iscsi_unload(); 2666 break; 2667 case MOD_QUIESCE: 2668 error = iscsi_quiesce(); 2669 break; 2670 default: 2671 error = EINVAL; 2672 break; 2673 } 2674 return (error); 2675 } 2676 2677 moduledata_t iscsi_data = { 2678 "iscsi", 2679 iscsi_modevent, 2680 0 2681 }; 2682 2683 DECLARE_MODULE(iscsi, iscsi_data, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 2684 MODULE_DEPEND(iscsi, cam, 1, 1, 1); 2685 MODULE_DEPEND(iscsi, icl, 1, 1, 1); 2686