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