sys/dev/iscsi/iscsi.c

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