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/sysctl.h>
  47 #include <sys/systm.h>
  48 #include <sys/sx.h>
  49 #include <vm/uma.h>
  50
  51 #include <cam/cam.h>
  52 #include <cam/cam_ccb.h>
  53 #include <cam/cam_xpt.h>
  54 #include <cam/cam_debug.h>
  55 #include <cam/cam_sim.h>
  56 #include <cam/cam_xpt_sim.h>
  57 #include <cam/cam_xpt_periph.h>
  58 #include <cam/cam_periph.h>
  59 #include <cam/scsi/scsi_all.h>
  60 #include <cam/scsi/scsi_message.h>
  61
  62 #include <dev/iscsi/icl.h>
  63 #include <dev/iscsi/icl_wrappers.h>
  64 #include <dev/iscsi/iscsi_ioctl.h>
  65 #include <dev/iscsi/iscsi_proto.h>
  66 #include <dev/iscsi/iscsi.h>
  67
  68 #ifdef ICL_KERNEL_PROXY
  69 #include <sys/socketvar.h>
  70 #endif
  71
  72 #ifdef ICL_KERNEL_PROXY
  73 FEATURE(iscsi_kernel_proxy, "iSCSI initiator built with ICL_KERNEL_PROXY");
  74 #endif
  75
  76 /*
  77  * XXX: This is global so the iscsi_unload() can access it.
  78  *      Think about how to do this properly.
  79  */
  80 static struct iscsi_softc       *sc;
  81
  82 SYSCTL_NODE(_kern, OID_AUTO, iscsi, CTLFLAG_RD, 0, "iSCSI initiator");
  83 static int debug = 1;
  84 SYSCTL_INT(_kern_iscsi, OID_AUTO, debug, CTLFLAG_RWTUN,
  85     &debug, 0, "Enable debug messages");
  86 static int ping_timeout = 5;
  87 SYSCTL_INT(_kern_iscsi, OID_AUTO, ping_timeout, CTLFLAG_RWTUN, &ping_timeout,
  88     0, "Timeout for ping (NOP-Out) requests, in seconds");
  89 static int iscsid_timeout = 60;
  90 SYSCTL_INT(_kern_iscsi, OID_AUTO, iscsid_timeout, CTLFLAG_RWTUN, &iscsid_timeout,
  91     0, "Time to wait for iscsid(8) to handle reconnection, in seconds");
  92 static int login_timeout = 60;
  93 SYSCTL_INT(_kern_iscsi, OID_AUTO, login_timeout, CTLFLAG_RWTUN, &login_timeout,
  94     0, "Time to wait for iscsid(8) to finish Login Phase, in seconds");
  95 static int maxtags = 255;
  96 SYSCTL_INT(_kern_iscsi, OID_AUTO, maxtags, CTLFLAG_RWTUN, &maxtags,
  97     0, "Max number of IO requests queued");
  98 static int fail_on_disconnection = 0;
  99 SYSCTL_INT(_kern_iscsi, OID_AUTO, fail_on_disconnection, CTLFLAG_RWTUN,
 100     &fail_on_disconnection, 0, "Destroy CAM SIM on connection failure");
 101 static int fail_on_shutdown = 1;
 102 SYSCTL_INT(_kern_iscsi, OID_AUTO, fail_on_shutdown, CTLFLAG_RWTUN,
 103     &fail_on_shutdown, 0, "Fail disconnected sessions on shutdown");
 104
 105 static MALLOC_DEFINE(M_ISCSI, "iSCSI", "iSCSI initiator");
 106 static uma_zone_t iscsi_outstanding_zone;
 107
 108 #define CONN_SESSION(X) ((struct iscsi_session *)X->ic_prv0)
 109 #define PDU_SESSION(X)  (CONN_SESSION(X->ip_conn))
 110
 111 #define ISCSI_DEBUG(X, ...)                                             \
 112         do {                                                            \
 113                 if (debug > 1)                                          \
 114                         printf("%s: " X "\n", __func__, ## __VA_ARGS__);\
 115         } while (0)
 116
 117 #define ISCSI_WARN(X, ...)                                              \
 118         do {                                                            \
 119                 if (debug > 0) {                                        \
 120                         printf("WARNING: %s: " X "\n",                  \
 121                             __func__, ## __VA_ARGS__);                  \
 122                 }                                                       \
 123         } while (0)
 124
 125 #define ISCSI_SESSION_DEBUG(S, X, ...)                                  \
 126         do {                                                            \
 127                 if (debug > 1) {                                        \
 128                         printf("%s: %s (%s): " X "\n",                  \
 129                             __func__, S->is_conf.isc_target_addr,       \
 130                             S->is_conf.isc_target, ## __VA_ARGS__);     \
 131                 }                                                       \
 132         } while (0)
 133
 134 #define ISCSI_SESSION_WARN(S, X, ...)                                   \
 135         do {                                                            \
 136                 if (debug > 0) {                                        \
 137                         printf("WARNING: %s (%s): " X "\n",             \
 138                             S->is_conf.isc_target_addr,                 \
 139                             S->is_conf.isc_target, ## __VA_ARGS__);     \
 140                 }                                                       \
 141         } while (0)
 142
 143 #define ISCSI_SESSION_LOCK(X)           mtx_lock(&X->is_lock)
 144 #define ISCSI_SESSION_UNLOCK(X)         mtx_unlock(&X->is_lock)
 145 #define ISCSI_SESSION_LOCK_ASSERT(X)    mtx_assert(&X->is_lock, MA_OWNED)
 146 #define ISCSI_SESSION_LOCK_ASSERT_NOT(X) mtx_assert(&X->is_lock, MA_NOTOWNED)
 147
 148 static int      iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg,
 149                     int mode, struct thread *td);
 150
 151 static struct cdevsw iscsi_cdevsw = {
 152      .d_version = D_VERSION,
 153      .d_ioctl   = iscsi_ioctl,
 154      .d_name    = "iscsi",
 155 };
 156
 157 static void     iscsi_pdu_queue_locked(struct icl_pdu *request);
 158 static void     iscsi_pdu_queue(struct icl_pdu *request);
 159 static void     iscsi_pdu_update_statsn(const struct icl_pdu *response);
 160 static void     iscsi_pdu_handle_nop_in(struct icl_pdu *response);
 161 static void     iscsi_pdu_handle_scsi_response(struct icl_pdu *response);
 162 static void     iscsi_pdu_handle_task_response(struct icl_pdu *response);
 163 static void     iscsi_pdu_handle_data_in(struct icl_pdu *response);
 164 static void     iscsi_pdu_handle_logout_response(struct icl_pdu *response);
 165 static void     iscsi_pdu_handle_r2t(struct icl_pdu *response);
 166 static void     iscsi_pdu_handle_async_message(struct icl_pdu *response);
 167 static void     iscsi_pdu_handle_reject(struct icl_pdu *response);
 168 static void     iscsi_session_reconnect(struct iscsi_session *is);
 169 static void     iscsi_session_terminate(struct iscsi_session *is);
 170 static void     iscsi_action(struct cam_sim *sim, union ccb *ccb);
 171 static void     iscsi_poll(struct cam_sim *sim);
 172 static struct iscsi_outstanding *iscsi_outstanding_find(struct iscsi_session *is,
 173                     uint32_t initiator_task_tag);
 174 static struct iscsi_outstanding *iscsi_outstanding_add(struct iscsi_session *is,
 175                     union ccb *ccb, uint32_t *initiator_task_tagp);
 176 static void     iscsi_outstanding_remove(struct iscsi_session *is,
 177                     struct iscsi_outstanding *io);
 178
 179 static bool
 180 iscsi_pdu_prepare(struct icl_pdu *request)
 181 {
 182         struct iscsi_session *is;
 183         struct iscsi_bhs_scsi_command *bhssc;
 184
 185         is = PDU_SESSION(request);
 186
 187         ISCSI_SESSION_LOCK_ASSERT(is);
 188
 189         /*
 190          * We're only using fields common for all the request
 191          * (initiator -> target) PDUs.
 192          */
 193         bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs;
 194
 195         /*
 196          * Data-Out PDU does not contain CmdSN.
 197          */
 198         if (bhssc->bhssc_opcode != ISCSI_BHS_OPCODE_SCSI_DATA_OUT) {
 199                 if (ISCSI_SNGT(is->is_cmdsn, is->is_maxcmdsn) &&
 200                     (bhssc->bhssc_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0) {
 201                         /*
 202                          * Current MaxCmdSN prevents us from sending any more
 203                          * SCSI Command PDUs to the target; postpone the PDU.
 204                          * It will get resent by either iscsi_pdu_queue(),
 205                          * or by maintenance thread.
 206                          */
 207 #if 0
 208                         ISCSI_SESSION_DEBUG(is, "postponing send, CmdSN %u, "
 209                             "ExpCmdSN %u, MaxCmdSN %u, opcode 0x%x",
 210                             is->is_cmdsn, is->is_expcmdsn, is->is_maxcmdsn,
 211                             bhssc->bhssc_opcode);
 212 #endif
 213                         return (true);
 214                 }
 215                 bhssc->bhssc_cmdsn = htonl(is->is_cmdsn);
 216                 if ((bhssc->bhssc_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0)
 217                         is->is_cmdsn++;
 218         }
 219         bhssc->bhssc_expstatsn = htonl(is->is_statsn + 1);
 220
 221         return (false);
 222 }
 223
 224 static void
 225 iscsi_session_send_postponed(struct iscsi_session *is)
 226 {
 227         struct icl_pdu *request;
 228         bool postpone;
 229
 230         ISCSI_SESSION_LOCK_ASSERT(is);
 231
 232         while (!STAILQ_EMPTY(&is->is_postponed)) {
 233                 request = STAILQ_FIRST(&is->is_postponed);
 234                 postpone = iscsi_pdu_prepare(request);
 235                 if (postpone)
 236                         break;
 237                 STAILQ_REMOVE_HEAD(&is->is_postponed, ip_next);
 238                 icl_pdu_queue(request);
 239         }
 240 }
 241
 242 static void
 243 iscsi_pdu_queue_locked(struct icl_pdu *request)
 244 {
 245         struct iscsi_session *is;
 246         bool postpone;
 247
 248         is = PDU_SESSION(request);
 249         ISCSI_SESSION_LOCK_ASSERT(is);
 250         iscsi_session_send_postponed(is);
 251         postpone = iscsi_pdu_prepare(request);
 252         if (postpone) {
 253                 STAILQ_INSERT_TAIL(&is->is_postponed, request, ip_next);
 254                 return;
 255         }
 256         icl_pdu_queue(request);
 257 }
 258
 259 static void
 260 iscsi_pdu_queue(struct icl_pdu *request)
 261 {
 262         struct iscsi_session *is;
 263
 264         is = PDU_SESSION(request);
 265         ISCSI_SESSION_LOCK(is);
 266         iscsi_pdu_queue_locked(request);
 267         ISCSI_SESSION_UNLOCK(is);
 268 }
 269
 270 static void
 271 iscsi_session_logout(struct iscsi_session *is)
 272 {
 273         struct icl_pdu *request;
 274         struct iscsi_bhs_logout_request *bhslr;
 275
 276         request = icl_pdu_new(is->is_conn, M_NOWAIT);
 277         if (request == NULL)
 278                 return;
 279
 280         bhslr = (struct iscsi_bhs_logout_request *)request->ip_bhs;
 281         bhslr->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_REQUEST;
 282         bhslr->bhslr_reason = BHSLR_REASON_CLOSE_SESSION;
 283         iscsi_pdu_queue_locked(request);
 284 }
 285
 286 static void
 287 iscsi_session_terminate_task(struct iscsi_session *is,
 288     struct iscsi_outstanding *io, bool requeue)
 289 {
 290
 291         if (io->io_ccb != NULL) {
 292                 io->io_ccb->ccb_h.status &= ~(CAM_SIM_QUEUED | CAM_STATUS_MASK);
 293                 if (requeue)
 294                         io->io_ccb->ccb_h.status |= CAM_REQUEUE_REQ;
 295                 else
 296                         io->io_ccb->ccb_h.status |= CAM_REQ_ABORTED;
 297                 if ((io->io_ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
 298                         io->io_ccb->ccb_h.status |= CAM_DEV_QFRZN;
 299                         xpt_freeze_devq(io->io_ccb->ccb_h.path, 1);
 300                         ISCSI_SESSION_DEBUG(is, "freezing devq");
 301                 }
 302                 xpt_done(io->io_ccb);
 303         }
 304         iscsi_outstanding_remove(is, io);
 305 }
 306
 307 static void
 308 iscsi_session_terminate_tasks(struct iscsi_session *is, bool requeue)
 309 {
 310         struct iscsi_outstanding *io, *tmp;
 311
 312         ISCSI_SESSION_LOCK_ASSERT(is);
 313
 314         TAILQ_FOREACH_SAFE(io, &is->is_outstanding, io_next, tmp) {
 315                 iscsi_session_terminate_task(is, io, requeue);
 316         }
 317 }
 318
 319 static void
 320 iscsi_session_cleanup(struct iscsi_session *is, bool destroy_sim)
 321 {
 322         struct icl_pdu *pdu;
 323
 324         ISCSI_SESSION_LOCK_ASSERT(is);
 325
 326         /*
 327          * Don't queue any new PDUs.
 328          */
 329         if (is->is_sim != NULL && is->is_simq_frozen == false) {
 330                 ISCSI_SESSION_DEBUG(is, "freezing");
 331                 xpt_freeze_simq(is->is_sim, 1);
 332                 is->is_simq_frozen = true;
 333         }
 334
 335         /*
 336          * Remove postponed PDUs.
 337          */
 338         while (!STAILQ_EMPTY(&is->is_postponed)) {
 339                 pdu = STAILQ_FIRST(&is->is_postponed);
 340                 STAILQ_REMOVE_HEAD(&is->is_postponed, ip_next);
 341                 icl_pdu_free(pdu);
 342         }
 343
 344         if (destroy_sim == false) {
 345                 /*
 346                  * Terminate SCSI tasks, asking CAM to requeue them.
 347                  */
 348                 iscsi_session_terminate_tasks(is, true);
 349                 return;
 350         }
 351
 352         iscsi_session_terminate_tasks(is, false);
 353
 354         if (is->is_sim == NULL)
 355                 return;
 356
 357         ISCSI_SESSION_DEBUG(is, "deregistering SIM");
 358         xpt_async(AC_LOST_DEVICE, is->is_path, NULL);
 359
 360         if (is->is_simq_frozen) {
 361                 xpt_release_simq(is->is_sim, 1);
 362                 is->is_simq_frozen = false;
 363         }
 364
 365         xpt_free_path(is->is_path);
 366         is->is_path = NULL;
 367         xpt_bus_deregister(cam_sim_path(is->is_sim));
 368         cam_sim_free(is->is_sim, TRUE /*free_devq*/);
 369         is->is_sim = NULL;
 370         is->is_devq = NULL;
 371 }
 372
 373 static void
 374 iscsi_maintenance_thread_reconnect(struct iscsi_session *is)
 375 {
 376
 377         icl_conn_close(is->is_conn);
 378
 379         ISCSI_SESSION_LOCK(is);
 380
 381         is->is_connected = false;
 382         is->is_reconnecting = false;
 383         is->is_login_phase = false;
 384
 385 #ifdef ICL_KERNEL_PROXY
 386         if (is->is_login_pdu != NULL) {
 387                 icl_pdu_free(is->is_login_pdu);
 388                 is->is_login_pdu = NULL;
 389         }
 390         cv_signal(&is->is_login_cv);
 391 #endif
 392
 393         if (fail_on_disconnection) {
 394                 ISCSI_SESSION_DEBUG(is, "connection failed, destroying devices");
 395                 iscsi_session_cleanup(is, true);
 396         } else {
 397                 iscsi_session_cleanup(is, false);
 398         }
 399
 400         KASSERT(TAILQ_EMPTY(&is->is_outstanding),
 401             ("destroying session with active tasks"));
 402         KASSERT(STAILQ_EMPTY(&is->is_postponed),
 403             ("destroying session with postponed PDUs"));
 404
 405         /*
 406          * Request immediate reconnection from iscsid(8).
 407          */
 408         //ISCSI_SESSION_DEBUG(is, "waking up iscsid(8)");
 409         is->is_waiting_for_iscsid = true;
 410         strlcpy(is->is_reason, "Waiting for iscsid(8)", sizeof(is->is_reason));
 411         is->is_timeout = 0;
 412         ISCSI_SESSION_UNLOCK(is);
 413         cv_signal(&is->is_softc->sc_cv);
 414 }
 415
 416 static void
 417 iscsi_maintenance_thread_terminate(struct iscsi_session *is)
 418 {
 419         struct iscsi_softc *sc;
 420
 421         sc = is->is_softc;
 422         sx_xlock(&sc->sc_lock);
 423
 424         icl_conn_close(is->is_conn);
 425         callout_drain(&is->is_callout);
 426
 427         ISCSI_SESSION_LOCK(is);
 428
 429         KASSERT(is->is_terminating, ("is_terminating == false"));
 430
 431 #ifdef ICL_KERNEL_PROXY
 432         if (is->is_login_pdu != NULL) {
 433                 icl_pdu_free(is->is_login_pdu);
 434                 is->is_login_pdu = NULL;
 435         }
 436         cv_signal(&is->is_login_cv);
 437 #endif
 438
 439         iscsi_session_cleanup(is, true);
 440
 441         KASSERT(TAILQ_EMPTY(&is->is_outstanding),
 442             ("destroying session with active tasks"));
 443         KASSERT(STAILQ_EMPTY(&is->is_postponed),
 444             ("destroying session with postponed PDUs"));
 445
 446         ISCSI_SESSION_UNLOCK(is);
 447
 448         icl_conn_free(is->is_conn);
 449         mtx_destroy(&is->is_lock);
 450         cv_destroy(&is->is_maintenance_cv);
 451 #ifdef ICL_KERNEL_PROXY
 452         cv_destroy(&is->is_login_cv);
 453 #endif
 454         TAILQ_REMOVE(&sc->sc_sessions, is, is_next);
 455         sx_xunlock(&sc->sc_lock);
 456
 457         ISCSI_SESSION_DEBUG(is, "terminated");
 458         free(is, M_ISCSI);
 459
 460         /*
 461          * The iscsi_unload() routine might be waiting.
 462          */
 463         cv_signal(&sc->sc_cv);
 464 }
 465
 466 static void
 467 iscsi_maintenance_thread(void *arg)
 468 {
 469         struct iscsi_session *is;
 470
 471         is = arg;
 472
 473         for (;;) {
 474                 ISCSI_SESSION_LOCK(is);
 475                 if (is->is_reconnecting == false &&
 476                     is->is_terminating == false &&
 477                     STAILQ_EMPTY(&is->is_postponed))
 478                         cv_wait(&is->is_maintenance_cv, &is->is_lock);
 479
 480                 /* Terminate supersedes reconnect. */
 481                 if (is->is_terminating) {
 482                         ISCSI_SESSION_UNLOCK(is);
 483                         iscsi_maintenance_thread_terminate(is);
 484                         kthread_exit();
 485                         return;
 486                 }
 487
 488                 if (is->is_reconnecting) {
 489                         ISCSI_SESSION_UNLOCK(is);
 490                         iscsi_maintenance_thread_reconnect(is);
 491                         continue;
 492                 }
 493
 494                 iscsi_session_send_postponed(is);
 495                 ISCSI_SESSION_UNLOCK(is);
 496         }
 497 }
 498
 499 static void
 500 iscsi_session_reconnect(struct iscsi_session *is)
 501 {
 502
 503         /*
 504          * XXX: We can't use locking here, because
 505          *      it's being called from various contexts.
 506          *      Hope it doesn't break anything.
 507          */
 508         if (is->is_reconnecting)
 509                 return;
 510
 511         is->is_reconnecting = true;
 512         cv_signal(&is->is_maintenance_cv);
 513 }
 514
 515 static void
 516 iscsi_session_terminate(struct iscsi_session *is)
 517 {
 518
 519         if (is->is_terminating)
 520                 return;
 521
 522         is->is_terminating = true;
 523
 524 #if 0
 525         iscsi_session_logout(is);
 526 #endif
 527         cv_signal(&is->is_maintenance_cv);
 528 }
 529
 530 static void
 531 iscsi_callout(void *context)
 532 {
 533         struct icl_pdu *request;
 534         struct iscsi_bhs_nop_out *bhsno;
 535         struct iscsi_session *is;
 536         bool reconnect_needed = false;
 537
 538         is = context;
 539
 540         ISCSI_SESSION_LOCK(is);
 541         if (is->is_terminating) {
 542                 ISCSI_SESSION_UNLOCK(is);
 543                 return;
 544         }
 545
 546         callout_schedule(&is->is_callout, 1 * hz);
 547
 548         is->is_timeout++;
 549
 550         if (is->is_waiting_for_iscsid) {
 551                 if (iscsid_timeout > 0 && is->is_timeout > iscsid_timeout) {
 552                         ISCSI_SESSION_WARN(is, "timed out waiting for iscsid(8) "
 553                             "for %d seconds; reconnecting",
 554                             is->is_timeout);
 555                         reconnect_needed = true;
 556                 }
 557                 goto out;
 558         }
 559
 560         if (is->is_login_phase) {
 561                 if (login_timeout > 0 && is->is_timeout > login_timeout) {
 562                         ISCSI_SESSION_WARN(is, "login timed out after %d seconds; "
 563                             "reconnecting", is->is_timeout);
 564                         reconnect_needed = true;
 565                 }
 566                 goto out;
 567         }
 568
 569         if (ping_timeout <= 0) {
 570                 /*
 571                  * Pings are disabled.  Don't send NOP-Out in this case.
 572                  * Reset the timeout, to avoid triggering reconnection,
 573                  * should the user decide to reenable them.
 574                  */
 575                 is->is_timeout = 0;
 576                 goto out;
 577         }
 578
 579         if (is->is_timeout >= ping_timeout) {
 580                 ISCSI_SESSION_WARN(is, "no ping reply (NOP-In) after %d seconds; "
 581                     "reconnecting", ping_timeout);
 582                 reconnect_needed = true;
 583                 goto out;
 584         }
 585
 586         ISCSI_SESSION_UNLOCK(is);
 587
 588         /*
 589          * If the ping was reset less than one second ago - which means
 590          * that we've received some PDU during the last second - assume
 591          * the traffic flows correctly and don't bother sending a NOP-Out.
 592          *
 593          * (It's 2 - one for one second, and one for incrementing is_timeout
 594          * earlier in this routine.)
 595          */
 596         if (is->is_timeout < 2)
 597                 return;
 598
 599         request = icl_pdu_new(is->is_conn, M_NOWAIT);
 600         if (request == NULL) {
 601                 ISCSI_SESSION_WARN(is, "failed to allocate PDU");
 602                 return;
 603         }
 604         bhsno = (struct iscsi_bhs_nop_out *)request->ip_bhs;
 605         bhsno->bhsno_opcode = ISCSI_BHS_OPCODE_NOP_OUT |
 606             ISCSI_BHS_OPCODE_IMMEDIATE;
 607         bhsno->bhsno_flags = 0x80;
 608         bhsno->bhsno_target_transfer_tag = 0xffffffff;
 609         iscsi_pdu_queue(request);
 610         return;
 611
 612 out:
 613         if (is->is_terminating) {
 614                 ISCSI_SESSION_UNLOCK(is);
 615                 return;
 616         }
 617
 618         ISCSI_SESSION_UNLOCK(is);
 619
 620         if (reconnect_needed)
 621                 iscsi_session_reconnect(is);
 622 }
 623
 624 static void
 625 iscsi_pdu_update_statsn(const struct icl_pdu *response)
 626 {
 627         const struct iscsi_bhs_data_in *bhsdi;
 628         struct iscsi_session *is;
 629         uint32_t expcmdsn, maxcmdsn, statsn;
 630
 631         is = PDU_SESSION(response);
 632
 633         ISCSI_SESSION_LOCK_ASSERT(is);
 634
 635         /*
 636          * We're only using fields common for all the response
 637          * (target -> initiator) PDUs.
 638          */
 639         bhsdi = (const struct iscsi_bhs_data_in *)response->ip_bhs;
 640         /*
 641          * Ok, I lied.  In case of Data-In, "The fields StatSN, Status,
 642          * and Residual Count only have meaningful content if the S bit
 643          * is set to 1", so we also need to check the bit specific for
 644          * Data-In PDU.
 645          */
 646         if (bhsdi->bhsdi_opcode != ISCSI_BHS_OPCODE_SCSI_DATA_IN ||
 647             (bhsdi->bhsdi_flags & BHSDI_FLAGS_S) != 0) {
 648                 statsn = ntohl(bhsdi->bhsdi_statsn);
 649                 if (statsn != is->is_statsn && statsn != (is->is_statsn + 1)) {
 650                         /* XXX: This is normal situation for MCS */
 651                         ISCSI_SESSION_WARN(is, "PDU 0x%x StatSN %u != "
 652                             "session ExpStatSN %u (or + 1); reconnecting",
 653                             bhsdi->bhsdi_opcode, statsn, is->is_statsn);
 654                         iscsi_session_reconnect(is);
 655                 }
 656                 if (ISCSI_SNGT(statsn, is->is_statsn))
 657                         is->is_statsn = statsn;
 658         }
 659
 660         expcmdsn = ntohl(bhsdi->bhsdi_expcmdsn);
 661         maxcmdsn = ntohl(bhsdi->bhsdi_maxcmdsn);
 662
 663         if (ISCSI_SNLT(maxcmdsn + 1, expcmdsn)) {
 664                 ISCSI_SESSION_DEBUG(is,
 665                     "PDU MaxCmdSN %u + 1 < PDU ExpCmdSN %u; ignoring",
 666                     maxcmdsn, expcmdsn);
 667         } else {
 668                 if (ISCSI_SNGT(maxcmdsn, is->is_maxcmdsn)) {
 669                         is->is_maxcmdsn = maxcmdsn;
 670
 671                         /*
 672                          * Command window increased; kick the maintanance thread
 673                          * to send out postponed commands.
 674                          */
 675                         if (!STAILQ_EMPTY(&is->is_postponed))
 676                                 cv_signal(&is->is_maintenance_cv);
 677                 } else if (ISCSI_SNLT(maxcmdsn, is->is_maxcmdsn)) {
 678                         /* XXX: This is normal situation for MCS */
 679                         ISCSI_SESSION_DEBUG(is,
 680                             "PDU MaxCmdSN %u < session MaxCmdSN %u; ignoring",
 681                             maxcmdsn, is->is_maxcmdsn);
 682                 }
 683
 684                 if (ISCSI_SNGT(expcmdsn, is->is_expcmdsn)) {
 685                         is->is_expcmdsn = expcmdsn;
 686                 } else if (ISCSI_SNLT(expcmdsn, is->is_expcmdsn)) {
 687                         /* XXX: This is normal situation for MCS */
 688                         ISCSI_SESSION_DEBUG(is,
 689                             "PDU ExpCmdSN %u < session ExpCmdSN %u; ignoring",
 690                             expcmdsn, is->is_expcmdsn);
 691                 }
 692         }
 693
 694         /*
 695          * Every incoming PDU - not just NOP-In - resets the ping timer.
 696          * The purpose of the timeout is to reset the connection when it stalls;
 697          * we don't want this to happen when NOP-In or NOP-Out ends up delayed
 698          * in some queue.
 699          */
 700         is->is_timeout = 0;
 701 }
 702
 703 static void
 704 iscsi_receive_callback(struct icl_pdu *response)
 705 {
 706         struct iscsi_session *is;
 707
 708         is = PDU_SESSION(response);
 709
 710         ISCSI_SESSION_LOCK(is);
 711
 712 #ifdef ICL_KERNEL_PROXY
 713         if (is->is_login_phase) {
 714                 if (is->is_login_pdu == NULL)
 715                         is->is_login_pdu = response;
 716                 else
 717                         icl_pdu_free(response);
 718                 ISCSI_SESSION_UNLOCK(is);
 719                 cv_signal(&is->is_login_cv);
 720                 return;
 721         }
 722 #endif
 723
 724         iscsi_pdu_update_statsn(response);
 725
 726         /*
 727          * The handling routine is responsible for freeing the PDU
 728          * when it's no longer needed.
 729          */
 730         switch (response->ip_bhs->bhs_opcode) {
 731         case ISCSI_BHS_OPCODE_NOP_IN:
 732                 iscsi_pdu_handle_nop_in(response);
 733                 ISCSI_SESSION_UNLOCK(is);
 734                 break;
 735         case ISCSI_BHS_OPCODE_SCSI_RESPONSE:
 736                 iscsi_pdu_handle_scsi_response(response);
 737                 /* Session lock dropped inside. */
 738                 ISCSI_SESSION_LOCK_ASSERT_NOT(is);
 739                 break;
 740         case ISCSI_BHS_OPCODE_TASK_RESPONSE:
 741                 iscsi_pdu_handle_task_response(response);
 742                 ISCSI_SESSION_UNLOCK(is);
 743                 break;
 744         case ISCSI_BHS_OPCODE_SCSI_DATA_IN:
 745                 iscsi_pdu_handle_data_in(response);
 746                 /* Session lock dropped inside. */
 747                 ISCSI_SESSION_LOCK_ASSERT_NOT(is);
 748                 break;
 749         case ISCSI_BHS_OPCODE_LOGOUT_RESPONSE:
 750                 iscsi_pdu_handle_logout_response(response);
 751                 ISCSI_SESSION_UNLOCK(is);
 752                 break;
 753         case ISCSI_BHS_OPCODE_R2T:
 754                 iscsi_pdu_handle_r2t(response);
 755                 ISCSI_SESSION_UNLOCK(is);
 756                 break;
 757         case ISCSI_BHS_OPCODE_ASYNC_MESSAGE:
 758                 iscsi_pdu_handle_async_message(response);
 759                 ISCSI_SESSION_UNLOCK(is);
 760                 break;
 761         case ISCSI_BHS_OPCODE_REJECT:
 762                 iscsi_pdu_handle_reject(response);
 763                 ISCSI_SESSION_UNLOCK(is);
 764                 break;
 765         default:
 766                 ISCSI_SESSION_WARN(is, "received PDU with unsupported "
 767                     "opcode 0x%x; reconnecting",
 768                     response->ip_bhs->bhs_opcode);
 769                 iscsi_session_reconnect(is);
 770                 ISCSI_SESSION_UNLOCK(is);
 771                 icl_pdu_free(response);
 772         }
 773 }
 774
 775 static void
 776 iscsi_error_callback(struct icl_conn *ic)
 777 {
 778         struct iscsi_session *is;
 779
 780         is = CONN_SESSION(ic);
 781
 782         ISCSI_SESSION_WARN(is, "connection error; reconnecting");
 783         iscsi_session_reconnect(is);
 784 }
 785
 786 static void
 787 iscsi_pdu_handle_nop_in(struct icl_pdu *response)
 788 {
 789         struct iscsi_session *is;
 790         struct iscsi_bhs_nop_out *bhsno;
 791         struct iscsi_bhs_nop_in *bhsni;
 792         struct icl_pdu *request;
 793         void *data = NULL;
 794         size_t datasize;
 795         int error;
 796
 797         is = PDU_SESSION(response);
 798         bhsni = (struct iscsi_bhs_nop_in *)response->ip_bhs;
 799
 800         if (bhsni->bhsni_target_transfer_tag == 0xffffffff) {
 801                 /*
 802                  * Nothing to do; iscsi_pdu_update_statsn() already
 803                  * zeroed the timeout.
 804                  */
 805                 icl_pdu_free(response);
 806                 return;
 807         }
 808
 809         datasize = icl_pdu_data_segment_length(response);
 810         if (datasize > 0) {
 811                 data = malloc(datasize, M_ISCSI, M_NOWAIT | M_ZERO);
 812                 if (data == NULL) {
 813                         ISCSI_SESSION_WARN(is, "failed to allocate memory; "
 814                             "reconnecting");
 815                         icl_pdu_free(response);
 816                         iscsi_session_reconnect(is);
 817                         return;
 818                 }
 819                 icl_pdu_get_data(response, 0, data, datasize);
 820         }
 821
 822         request = icl_pdu_new(response->ip_conn, M_NOWAIT);
 823         if (request == NULL) {
 824                 ISCSI_SESSION_WARN(is, "failed to allocate memory; "
 825                     "reconnecting");
 826                 free(data, M_ISCSI);
 827                 icl_pdu_free(response);
 828                 iscsi_session_reconnect(is);
 829                 return;
 830         }
 831         bhsno = (struct iscsi_bhs_nop_out *)request->ip_bhs;
 832         bhsno->bhsno_opcode = ISCSI_BHS_OPCODE_NOP_OUT |
 833             ISCSI_BHS_OPCODE_IMMEDIATE;
 834         bhsno->bhsno_flags = 0x80;
 835         bhsno->bhsno_initiator_task_tag = 0xffffffff;
 836         bhsno->bhsno_target_transfer_tag = bhsni->bhsni_target_transfer_tag;
 837         if (datasize > 0) {
 838                 error = icl_pdu_append_data(request, data, datasize, M_NOWAIT);
 839                 if (error != 0) {
 840                         ISCSI_SESSION_WARN(is, "failed to allocate memory; "
 841                             "reconnecting");
 842                         free(data, M_ISCSI);
 843                         icl_pdu_free(request);
 844                         icl_pdu_free(response);
 845                         iscsi_session_reconnect(is);
 846                         return;
 847                 }
 848                 free(data, M_ISCSI);
 849         }
 850
 851         icl_pdu_free(response);
 852         iscsi_pdu_queue_locked(request);
 853 }
 854
 855 static void
 856 iscsi_pdu_handle_scsi_response(struct icl_pdu *response)
 857 {
 858         struct iscsi_bhs_scsi_response *bhssr;
 859         struct iscsi_outstanding *io;
 860         struct iscsi_session *is;
 861         union ccb *ccb;
 862         struct ccb_scsiio *csio;
 863         size_t data_segment_len, received;
 864         uint16_t sense_len;
 865
 866         is = PDU_SESSION(response);
 867
 868         bhssr = (struct iscsi_bhs_scsi_response *)response->ip_bhs;
 869         io = iscsi_outstanding_find(is, bhssr->bhssr_initiator_task_tag);
 870         if (io == NULL || io->io_ccb == NULL) {
 871                 ISCSI_SESSION_WARN(is, "bad itt 0x%x", bhssr->bhssr_initiator_task_tag);
 872                 icl_pdu_free(response);
 873                 iscsi_session_reconnect(is);
 874                 ISCSI_SESSION_UNLOCK(is);
 875                 return;
 876         }
 877
 878         ccb = io->io_ccb;
 879         received = io->io_received;
 880         iscsi_outstanding_remove(is, io);
 881         ISCSI_SESSION_UNLOCK(is);
 882
 883         if (bhssr->bhssr_response != BHSSR_RESPONSE_COMMAND_COMPLETED) {
 884                 ISCSI_SESSION_WARN(is, "service response 0x%x", bhssr->bhssr_response);
 885                 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
 886                         xpt_freeze_devq(ccb->ccb_h.path, 1);
 887                         ISCSI_SESSION_DEBUG(is, "freezing devq");
 888                 }
 889                 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN;
 890         } else if (bhssr->bhssr_status == 0) {
 891                 ccb->ccb_h.status = CAM_REQ_CMP;
 892         } else {
 893                 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
 894                         xpt_freeze_devq(ccb->ccb_h.path, 1);
 895                         ISCSI_SESSION_DEBUG(is, "freezing devq");
 896                 }
 897                 ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR | CAM_DEV_QFRZN;
 898                 ccb->csio.scsi_status = bhssr->bhssr_status;
 899         }
 900
 901         csio = &ccb->csio;
 902         data_segment_len = icl_pdu_data_segment_length(response);
 903         if (data_segment_len > 0) {
 904                 if (data_segment_len < sizeof(sense_len)) {
 905                         ISCSI_SESSION_WARN(is, "truncated data segment (%zd bytes)",
 906                             data_segment_len);
 907                         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
 908                                 xpt_freeze_devq(ccb->ccb_h.path, 1);
 909                                 ISCSI_SESSION_DEBUG(is, "freezing devq");
 910                         }
 911                         ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN;
 912                         goto out;
 913                 }
 914                 icl_pdu_get_data(response, 0, &sense_len, sizeof(sense_len));
 915                 sense_len = ntohs(sense_len);
 916 #if 0
 917                 ISCSI_SESSION_DEBUG(is, "sense_len %d, data len %zd",
 918                     sense_len, data_segment_len);
 919 #endif
 920                 if (sizeof(sense_len) + sense_len > data_segment_len) {
 921                         ISCSI_SESSION_WARN(is, "truncated data segment "
 922                             "(%zd bytes, should be %zd)",
 923                             data_segment_len, sizeof(sense_len) + sense_len);
 924                         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
 925                                 xpt_freeze_devq(ccb->ccb_h.path, 1);
 926                                 ISCSI_SESSION_DEBUG(is, "freezing devq");
 927                         }
 928                         ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN;
 929                         goto out;
 930                 } else if (sizeof(sense_len) + sense_len < data_segment_len)
 931                         ISCSI_SESSION_WARN(is, "oversize data segment "
 932                             "(%zd bytes, should be %zd)",
 933                             data_segment_len, sizeof(sense_len) + sense_len);
 934                 if (sense_len > csio->sense_len) {
 935                         ISCSI_SESSION_DEBUG(is, "truncating sense from %d to %d",
 936                             sense_len, csio->sense_len);
 937                         sense_len = csio->sense_len;
 938                 }
 939                 icl_pdu_get_data(response, sizeof(sense_len), &csio->sense_data, sense_len);
 940                 csio->sense_resid = csio->sense_len - sense_len;
 941                 ccb->ccb_h.status |= CAM_AUTOSNS_VALID;
 942         }
 943
 944 out:
 945         if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_UNDERFLOW)
 946                 csio->resid = ntohl(bhssr->bhssr_residual_count);
 947
 948         if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) {
 949                 KASSERT(received <= csio->dxfer_len,
 950                     ("received > csio->dxfer_len"));
 951                 if (received < csio->dxfer_len) {
 952                         if (csio->resid != csio->dxfer_len - received) {
 953                                 ISCSI_SESSION_WARN(is, "underflow mismatch: "
 954                                     "target indicates %d, we calculated %zd",
 955                                     csio->resid, csio->dxfer_len - received);
 956                         }
 957                         csio->resid = csio->dxfer_len - received;
 958                 }
 959         }
 960
 961         xpt_done(ccb);
 962         icl_pdu_free(response);
 963 }
 964
 965 static void
 966 iscsi_pdu_handle_task_response(struct icl_pdu *response)
 967 {
 968         struct iscsi_bhs_task_management_response *bhstmr;
 969         struct iscsi_outstanding *io, *aio;
 970         struct iscsi_session *is;
 971
 972         is = PDU_SESSION(response);
 973
 974         bhstmr = (struct iscsi_bhs_task_management_response *)response->ip_bhs;
 975         io = iscsi_outstanding_find(is, bhstmr->bhstmr_initiator_task_tag);
 976         if (io == NULL || io->io_ccb != NULL) {
 977                 ISCSI_SESSION_WARN(is, "bad itt 0x%x",
 978                     bhstmr->bhstmr_initiator_task_tag);
 979                 icl_pdu_free(response);
 980                 iscsi_session_reconnect(is);
 981                 return;
 982         }
 983
 984         if (bhstmr->bhstmr_response != BHSTMR_RESPONSE_FUNCTION_COMPLETE) {
 985                 ISCSI_SESSION_WARN(is, "task response 0x%x",
 986                     bhstmr->bhstmr_response);
 987         } else {
 988                 aio = iscsi_outstanding_find(is, io->io_datasn);
 989                 if (aio != NULL && aio->io_ccb != NULL)
 990                         iscsi_session_terminate_task(is, aio, false);
 991         }
 992
 993         iscsi_outstanding_remove(is, io);
 994         icl_pdu_free(response);
 995 }
 996
 997 static void
 998 iscsi_pdu_handle_data_in(struct icl_pdu *response)
 999 {
1000         struct iscsi_bhs_data_in *bhsdi;
1001         struct iscsi_outstanding *io;
1002         struct iscsi_session *is;
1003         union ccb *ccb;
1004         struct ccb_scsiio *csio;
1005         size_t data_segment_len, received, oreceived;
1006
1007         is = PDU_SESSION(response);
1008         bhsdi = (struct iscsi_bhs_data_in *)response->ip_bhs;
1009         io = iscsi_outstanding_find(is, bhsdi->bhsdi_initiator_task_tag);
1010         if (io == NULL || io->io_ccb == NULL) {
1011                 ISCSI_SESSION_WARN(is, "bad itt 0x%x", bhsdi->bhsdi_initiator_task_tag);
1012                 icl_pdu_free(response);
1013                 iscsi_session_reconnect(is);
1014                 ISCSI_SESSION_UNLOCK(is);
1015                 return;
1016         }
1017
1018         data_segment_len = icl_pdu_data_segment_length(response);
1019         if (data_segment_len == 0) {
1020                 /*
1021                  * "The sending of 0 length data segments should be avoided,
1022                  * but initiators and targets MUST be able to properly receive
1023                  * 0 length data segments."
1024                  */
1025                 ISCSI_SESSION_UNLOCK(is);
1026                 icl_pdu_free(response);
1027                 return;
1028         }
1029
1030         /*
1031          * We need to track this for security reasons - without it, malicious target
1032          * could respond to SCSI READ without sending Data-In PDUs, which would result
1033          * in read operation on the initiator side returning random kernel data.
1034          */
1035         if (ntohl(bhsdi->bhsdi_buffer_offset) != io->io_received) {
1036                 ISCSI_SESSION_WARN(is, "data out of order; expected offset %zd, got %zd",
1037                     io->io_received, (size_t)ntohl(bhsdi->bhsdi_buffer_offset));
1038                 icl_pdu_free(response);
1039                 iscsi_session_reconnect(is);
1040                 ISCSI_SESSION_UNLOCK(is);
1041                 return;
1042         }
1043
1044         ccb = io->io_ccb;
1045         csio = &ccb->csio;
1046
1047         if (io->io_received + data_segment_len > csio->dxfer_len) {
1048                 ISCSI_SESSION_WARN(is, "oversize data segment (%zd bytes "
1049                     "at offset %zd, buffer is %d)",
1050                     data_segment_len, io->io_received, csio->dxfer_len);
1051                 icl_pdu_free(response);
1052                 iscsi_session_reconnect(is);
1053                 ISCSI_SESSION_UNLOCK(is);
1054                 return;
1055         }
1056
1057         oreceived = io->io_received;
1058         io->io_received += data_segment_len;
1059         received = io->io_received;
1060         if ((bhsdi->bhsdi_flags & BHSDI_FLAGS_S) != 0)
1061                 iscsi_outstanding_remove(is, io);
1062         ISCSI_SESSION_UNLOCK(is);
1063
1064         icl_pdu_get_data(response, 0, csio->data_ptr + oreceived, data_segment_len);
1065
1066         /*
1067          * XXX: Check DataSN.
1068          * XXX: Check F.
1069          */
1070         if ((bhsdi->bhsdi_flags & BHSDI_FLAGS_S) == 0) {
1071                 /*
1072                  * Nothing more to do.
1073                  */
1074                 icl_pdu_free(response);
1075                 return;
1076         }
1077
1078         //ISCSI_SESSION_DEBUG(is, "got S flag; status 0x%x", bhsdi->bhsdi_status);
1079         if (bhsdi->bhsdi_status == 0) {
1080                 ccb->ccb_h.status = CAM_REQ_CMP;
1081         } else {
1082                 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
1083                         xpt_freeze_devq(ccb->ccb_h.path, 1);
1084                         ISCSI_SESSION_DEBUG(is, "freezing devq");
1085                 }
1086                 ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR | CAM_DEV_QFRZN;
1087                 csio->scsi_status = bhsdi->bhsdi_status;
1088         }
1089
1090         if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) {
1091                 KASSERT(received <= csio->dxfer_len,
1092                     ("received > csio->dxfer_len"));
1093                 if (received < csio->dxfer_len) {
1094                         csio->resid = ntohl(bhsdi->bhsdi_residual_count);
1095                         if (csio->resid != csio->dxfer_len - received) {
1096                                 ISCSI_SESSION_WARN(is, "underflow mismatch: "
1097                                     "target indicates %d, we calculated %zd",
1098                                     csio->resid, csio->dxfer_len - received);
1099                         }
1100                         csio->resid = csio->dxfer_len - received;
1101                 }
1102         }
1103
1104         xpt_done(ccb);
1105         icl_pdu_free(response);
1106 }
1107
1108 static void
1109 iscsi_pdu_handle_logout_response(struct icl_pdu *response)
1110 {
1111
1112         ISCSI_SESSION_DEBUG(PDU_SESSION(response), "logout response");
1113         icl_pdu_free(response);
1114 }
1115
1116 static void
1117 iscsi_pdu_handle_r2t(struct icl_pdu *response)
1118 {
1119         struct icl_pdu *request;
1120         struct iscsi_session *is;
1121         struct iscsi_bhs_r2t *bhsr2t;
1122         struct iscsi_bhs_data_out *bhsdo;
1123         struct iscsi_outstanding *io;
1124         struct ccb_scsiio *csio;
1125         size_t off, len, total_len;
1126         int error;
1127
1128         is = PDU_SESSION(response);
1129
1130         bhsr2t = (struct iscsi_bhs_r2t *)response->ip_bhs;
1131         io = iscsi_outstanding_find(is, bhsr2t->bhsr2t_initiator_task_tag);
1132         if (io == NULL || io->io_ccb == NULL) {
1133                 ISCSI_SESSION_WARN(is, "bad itt 0x%x; reconnecting",
1134                     bhsr2t->bhsr2t_initiator_task_tag);
1135                 icl_pdu_free(response);
1136                 iscsi_session_reconnect(is);
1137                 return;
1138         }
1139
1140         csio = &io->io_ccb->csio;
1141
1142         if ((csio->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_OUT) {
1143                 ISCSI_SESSION_WARN(is, "received R2T for read command; reconnecting");
1144                 icl_pdu_free(response);
1145                 iscsi_session_reconnect(is);
1146                 return;
1147         }
1148
1149         /*
1150          * XXX: Verify R2TSN.
1151          */
1152
1153         io->io_datasn = 0;
1154
1155         off = ntohl(bhsr2t->bhsr2t_buffer_offset);
1156         if (off > csio->dxfer_len) {
1157                 ISCSI_SESSION_WARN(is, "target requested invalid offset "
1158                     "%zd, buffer is is %d; reconnecting", off, csio->dxfer_len);
1159                 icl_pdu_free(response);
1160                 iscsi_session_reconnect(is);
1161                 return;
1162         }
1163
1164         total_len = ntohl(bhsr2t->bhsr2t_desired_data_transfer_length);
1165         if (total_len == 0 || total_len > csio->dxfer_len) {
1166                 ISCSI_SESSION_WARN(is, "target requested invalid length "
1167                     "%zd, buffer is %d; reconnecting", total_len, csio->dxfer_len);
1168                 icl_pdu_free(response);
1169                 iscsi_session_reconnect(is);
1170                 return;
1171         }
1172
1173         //ISCSI_SESSION_DEBUG(is, "r2t; off %zd, len %zd", off, total_len);
1174
1175         for (;;) {
1176                 len = total_len;
1177
1178                 if (len > is->is_max_data_segment_length)
1179                         len = is->is_max_data_segment_length;
1180
1181                 if (off + len > csio->dxfer_len) {
1182                         ISCSI_SESSION_WARN(is, "target requested invalid "
1183                             "length/offset %zd, buffer is %d; reconnecting",
1184                             off + len, csio->dxfer_len);
1185                         icl_pdu_free(response);
1186                         iscsi_session_reconnect(is);
1187                         return;
1188                 }
1189
1190                 request = icl_pdu_new(response->ip_conn, M_NOWAIT);
1191                 if (request == NULL) {
1192                         icl_pdu_free(response);
1193                         iscsi_session_reconnect(is);
1194                         return;
1195                 }
1196
1197                 bhsdo = (struct iscsi_bhs_data_out *)request->ip_bhs;
1198                 bhsdo->bhsdo_opcode = ISCSI_BHS_OPCODE_SCSI_DATA_OUT;
1199                 bhsdo->bhsdo_lun = bhsr2t->bhsr2t_lun;
1200                 bhsdo->bhsdo_initiator_task_tag =
1201                     bhsr2t->bhsr2t_initiator_task_tag;
1202                 bhsdo->bhsdo_target_transfer_tag =
1203                     bhsr2t->bhsr2t_target_transfer_tag;
1204                 bhsdo->bhsdo_datasn = htonl(io->io_datasn++);
1205                 bhsdo->bhsdo_buffer_offset = htonl(off);
1206                 error = icl_pdu_append_data(request, csio->data_ptr + off, len,
1207                     M_NOWAIT);
1208                 if (error != 0) {
1209                         ISCSI_SESSION_WARN(is, "failed to allocate memory; "
1210                             "reconnecting");
1211                         icl_pdu_free(request);
1212                         icl_pdu_free(response);
1213                         iscsi_session_reconnect(is);
1214                         return;
1215                 }
1216
1217                 off += len;
1218                 total_len -= len;
1219
1220                 if (total_len == 0) {
1221                         bhsdo->bhsdo_flags |= BHSDO_FLAGS_F;
1222                         //ISCSI_SESSION_DEBUG(is, "setting F, off %zd", off);
1223                 } else {
1224                         //ISCSI_SESSION_DEBUG(is, "not finished, off %zd", off);
1225                 }
1226
1227                 iscsi_pdu_queue_locked(request);
1228
1229                 if (total_len == 0)
1230                         break;
1231         }
1232
1233         icl_pdu_free(response);
1234 }
1235
1236 static void
1237 iscsi_pdu_handle_async_message(struct icl_pdu *response)
1238 {
1239         struct iscsi_bhs_asynchronous_message *bhsam;
1240         struct iscsi_session *is;
1241
1242         is = PDU_SESSION(response);
1243         bhsam = (struct iscsi_bhs_asynchronous_message *)response->ip_bhs;
1244         switch (bhsam->bhsam_async_event) {
1245         case BHSAM_EVENT_TARGET_REQUESTS_LOGOUT:
1246                 ISCSI_SESSION_WARN(is, "target requests logout; removing session");
1247                 iscsi_session_logout(is);
1248                 iscsi_session_terminate(is);
1249                 break;
1250         case BHSAM_EVENT_TARGET_TERMINATES_CONNECTION:
1251                 ISCSI_SESSION_WARN(is, "target indicates it will drop drop the connection");
1252                 break;
1253         case BHSAM_EVENT_TARGET_TERMINATES_SESSION:
1254                 ISCSI_SESSION_WARN(is, "target indicates it will drop drop the session");
1255                 break;
1256         default:
1257                 /*
1258                  * XXX: Technically, we're obligated to also handle
1259                  *      parameter renegotiation.
1260                  */
1261                 ISCSI_SESSION_WARN(is, "ignoring AsyncEvent %d", bhsam->bhsam_async_event);
1262                 break;
1263         }
1264
1265         icl_pdu_free(response);
1266 }
1267
1268 static void
1269 iscsi_pdu_handle_reject(struct icl_pdu *response)
1270 {
1271         struct iscsi_bhs_reject *bhsr;
1272         struct iscsi_session *is;
1273
1274         is = PDU_SESSION(response);
1275         bhsr = (struct iscsi_bhs_reject *)response->ip_bhs;
1276         ISCSI_SESSION_WARN(is, "received Reject PDU, reason 0x%x; protocol error?",
1277             bhsr->bhsr_reason);
1278
1279         icl_pdu_free(response);
1280 }
1281
1282 static int
1283 iscsi_ioctl_daemon_wait(struct iscsi_softc *sc,
1284     struct iscsi_daemon_request *request)
1285 {
1286         struct iscsi_session *is;
1287         int error;
1288
1289         sx_slock(&sc->sc_lock);
1290         for (;;) {
1291                 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1292                         ISCSI_SESSION_LOCK(is);
1293                         if (is->is_waiting_for_iscsid)
1294                                 break;
1295                         ISCSI_SESSION_UNLOCK(is);
1296                 }
1297
1298                 if (is == NULL) {
1299                         /*
1300                          * No session requires attention from iscsid(8); wait.
1301                          */
1302                         error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock);
1303                         if (error != 0) {
1304                                 sx_sunlock(&sc->sc_lock);
1305                                 return (error);
1306                         }
1307                         continue;
1308                 }
1309
1310                 is->is_waiting_for_iscsid = false;
1311                 is->is_login_phase = true;
1312                 is->is_reason[0] = '\0';
1313                 ISCSI_SESSION_UNLOCK(is);
1314
1315                 request->idr_session_id = is->is_id;
1316                 memcpy(&request->idr_isid, &is->is_isid,
1317                     sizeof(request->idr_isid));
1318                 request->idr_tsih = 0;  /* New or reinstated session. */
1319                 memcpy(&request->idr_conf, &is->is_conf,
1320                     sizeof(request->idr_conf));
1321
1322                 error = icl_limits(is->is_conf.isc_offload,
1323                     &request->idr_limits.isl_max_data_segment_length);
1324                 if (error != 0) {
1325                         ISCSI_SESSION_WARN(is, "icl_limits for offload \"%s\" "
1326                             "failed with error %d", is->is_conf.isc_offload,
1327                             error);
1328                         sx_sunlock(&sc->sc_lock);
1329                         return (error);
1330                 }
1331
1332                 sx_sunlock(&sc->sc_lock);
1333                 return (0);
1334         }
1335 }
1336
1337 static int
1338 iscsi_ioctl_daemon_handoff(struct iscsi_softc *sc,
1339     struct iscsi_daemon_handoff *handoff)
1340 {
1341         struct iscsi_session *is;
1342         struct icl_conn *ic;
1343         int error;
1344
1345         sx_slock(&sc->sc_lock);
1346
1347         /*
1348          * Find the session to hand off socket to.
1349          */
1350         TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1351                 if (is->is_id == handoff->idh_session_id)
1352                         break;
1353         }
1354         if (is == NULL) {
1355                 sx_sunlock(&sc->sc_lock);
1356                 return (ESRCH);
1357         }
1358         ISCSI_SESSION_LOCK(is);
1359         ic = is->is_conn;
1360         if (is->is_conf.isc_discovery || is->is_terminating) {
1361                 ISCSI_SESSION_UNLOCK(is);
1362                 sx_sunlock(&sc->sc_lock);
1363                 return (EINVAL);
1364         }
1365         if (is->is_connected) {
1366                 /*
1367                  * This might have happened because another iscsid(8)
1368                  * instance handed off the connection in the meantime.
1369                  * Just return.
1370                  */
1371                 ISCSI_SESSION_WARN(is, "handoff on already connected "
1372                     "session");
1373                 ISCSI_SESSION_UNLOCK(is);
1374                 sx_sunlock(&sc->sc_lock);
1375                 return (EBUSY);
1376         }
1377
1378         strlcpy(is->is_target_alias, handoff->idh_target_alias,
1379             sizeof(is->is_target_alias));
1380         is->is_tsih = handoff->idh_tsih;
1381         is->is_statsn = handoff->idh_statsn;
1382         is->is_initial_r2t = handoff->idh_initial_r2t;
1383         is->is_immediate_data = handoff->idh_immediate_data;
1384
1385         /*
1386          * Cap MaxRecvDataSegmentLength obtained from the target to the maximum
1387          * size supported by our ICL module.
1388          */
1389         is->is_max_data_segment_length = min(ic->ic_max_data_segment_length,
1390             handoff->idh_max_data_segment_length);
1391         is->is_max_burst_length = handoff->idh_max_burst_length;
1392         is->is_first_burst_length = handoff->idh_first_burst_length;
1393
1394         if (handoff->idh_header_digest == ISCSI_DIGEST_CRC32C)
1395                 ic->ic_header_crc32c = true;
1396         else
1397                 ic->ic_header_crc32c = false;
1398         if (handoff->idh_data_digest == ISCSI_DIGEST_CRC32C)
1399                 ic->ic_data_crc32c = true;
1400         else
1401                 ic->ic_data_crc32c = false;
1402
1403         is->is_cmdsn = 0;
1404         is->is_expcmdsn = 0;
1405         is->is_maxcmdsn = 0;
1406         is->is_waiting_for_iscsid = false;
1407         is->is_login_phase = false;
1408         is->is_timeout = 0;
1409         is->is_connected = true;
1410         is->is_reason[0] = '\0';
1411
1412         ISCSI_SESSION_UNLOCK(is);
1413
1414 #ifdef ICL_KERNEL_PROXY
1415         if (handoff->idh_socket != 0) {
1416 #endif
1417                 /*
1418                  * Handoff without using ICL proxy.
1419                  */
1420                 error = icl_conn_handoff(ic, handoff->idh_socket);
1421                 if (error != 0) {
1422                         sx_sunlock(&sc->sc_lock);
1423                         iscsi_session_terminate(is);
1424                         return (error);
1425                 }
1426 #ifdef ICL_KERNEL_PROXY
1427         }
1428 #endif
1429
1430         sx_sunlock(&sc->sc_lock);
1431
1432         if (is->is_sim != NULL) {
1433                 /*
1434                  * When reconnecting, there already is SIM allocated for the session.
1435                  */
1436                 KASSERT(is->is_simq_frozen, ("reconnect without frozen simq"));
1437                 ISCSI_SESSION_LOCK(is);
1438                 ISCSI_SESSION_DEBUG(is, "releasing");
1439                 xpt_release_simq(is->is_sim, 1);
1440                 is->is_simq_frozen = false;
1441                 ISCSI_SESSION_UNLOCK(is);
1442
1443         } else {
1444                 ISCSI_SESSION_LOCK(is);
1445                 is->is_devq = cam_simq_alloc(maxtags);
1446                 if (is->is_devq == NULL) {
1447                         ISCSI_SESSION_WARN(is, "failed to allocate simq");
1448                         iscsi_session_terminate(is);
1449                         return (ENOMEM);
1450                 }
1451
1452                 is->is_sim = cam_sim_alloc(iscsi_action, iscsi_poll, "iscsi",
1453                     is, is->is_id /* unit */, &is->is_lock,
1454                     1, maxtags, is->is_devq);
1455                 if (is->is_sim == NULL) {
1456                         ISCSI_SESSION_UNLOCK(is);
1457                         ISCSI_SESSION_WARN(is, "failed to allocate SIM");
1458                         cam_simq_free(is->is_devq);
1459                         iscsi_session_terminate(is);
1460                         return (ENOMEM);
1461                 }
1462
1463                 error = xpt_bus_register(is->is_sim, NULL, 0);
1464                 if (error != 0) {
1465                         ISCSI_SESSION_UNLOCK(is);
1466                         ISCSI_SESSION_WARN(is, "failed to register bus");
1467                         iscsi_session_terminate(is);
1468                         return (ENOMEM);
1469                 }
1470
1471                 error = xpt_create_path(&is->is_path, /*periph*/NULL,
1472                     cam_sim_path(is->is_sim), CAM_TARGET_WILDCARD,
1473                     CAM_LUN_WILDCARD);
1474                 if (error != CAM_REQ_CMP) {
1475                         ISCSI_SESSION_UNLOCK(is);
1476                         ISCSI_SESSION_WARN(is, "failed to create path");
1477                         iscsi_session_terminate(is);
1478                         return (ENOMEM);
1479                 }
1480                 ISCSI_SESSION_UNLOCK(is);
1481         }
1482
1483         return (0);
1484 }
1485
1486 static int
1487 iscsi_ioctl_daemon_fail(struct iscsi_softc *sc,
1488     struct iscsi_daemon_fail *fail)
1489 {
1490         struct iscsi_session *is;
1491
1492         sx_slock(&sc->sc_lock);
1493
1494         TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1495                 if (is->is_id == fail->idf_session_id)
1496                         break;
1497         }
1498         if (is == NULL) {
1499                 sx_sunlock(&sc->sc_lock);
1500                 return (ESRCH);
1501         }
1502         ISCSI_SESSION_LOCK(is);
1503         ISCSI_SESSION_DEBUG(is, "iscsid(8) failed: %s",
1504             fail->idf_reason);
1505         strlcpy(is->is_reason, fail->idf_reason, sizeof(is->is_reason));
1506         //is->is_waiting_for_iscsid = false;
1507         //is->is_login_phase = true;
1508         //iscsi_session_reconnect(is);
1509         ISCSI_SESSION_UNLOCK(is);
1510         sx_sunlock(&sc->sc_lock);
1511
1512         return (0);
1513 }
1514
1515 #ifdef ICL_KERNEL_PROXY
1516 static int
1517 iscsi_ioctl_daemon_connect(struct iscsi_softc *sc,
1518     struct iscsi_daemon_connect *idc)
1519 {
1520         struct iscsi_session *is;
1521         struct sockaddr *from_sa, *to_sa;
1522         int error;
1523
1524         sx_slock(&sc->sc_lock);
1525         TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1526                 if (is->is_id == idc->idc_session_id)
1527                         break;
1528         }
1529         if (is == NULL) {
1530                 sx_sunlock(&sc->sc_lock);
1531                 return (ESRCH);
1532         }
1533         sx_sunlock(&sc->sc_lock);
1534
1535         if (idc->idc_from_addrlen > 0) {
1536                 error = getsockaddr(&from_sa, (void *)idc->idc_from_addr, idc->idc_from_addrlen);
1537                 if (error != 0) {
1538                         ISCSI_SESSION_WARN(is,
1539                             "getsockaddr failed with error %d", error);
1540                         return (error);
1541                 }
1542         } else {
1543                 from_sa = NULL;
1544         }
1545         error = getsockaddr(&to_sa, (void *)idc->idc_to_addr, idc->idc_to_addrlen);
1546         if (error != 0) {
1547                 ISCSI_SESSION_WARN(is, "getsockaddr failed with error %d",
1548                     error);
1549                 free(from_sa, M_SONAME);
1550                 return (error);
1551         }
1552
1553         ISCSI_SESSION_LOCK(is);
1554         is->is_waiting_for_iscsid = false;
1555         is->is_login_phase = true;
1556         is->is_timeout = 0;
1557         ISCSI_SESSION_UNLOCK(is);
1558
1559         error = icl_conn_connect(is->is_conn, idc->idc_iser, idc->idc_domain,
1560             idc->idc_socktype, idc->idc_protocol, from_sa, to_sa);
1561         free(from_sa, M_SONAME);
1562         free(to_sa, M_SONAME);
1563
1564         /*
1565          * Digests are always disabled during login phase.
1566          */
1567         is->is_conn->ic_header_crc32c = false;
1568         is->is_conn->ic_data_crc32c = false;
1569
1570         return (error);
1571 }
1572
1573 static int
1574 iscsi_ioctl_daemon_send(struct iscsi_softc *sc,
1575     struct iscsi_daemon_send *ids)
1576 {
1577         struct iscsi_session *is;
1578         struct icl_pdu *ip;
1579         size_t datalen;
1580         void *data;
1581         int error;
1582
1583         sx_slock(&sc->sc_lock);
1584         TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1585                 if (is->is_id == ids->ids_session_id)
1586                         break;
1587         }
1588         if (is == NULL) {
1589                 sx_sunlock(&sc->sc_lock);
1590                 return (ESRCH);
1591         }
1592         sx_sunlock(&sc->sc_lock);
1593
1594         if (is->is_login_phase == false)
1595                 return (EBUSY);
1596
1597         if (is->is_terminating || is->is_reconnecting)
1598                 return (EIO);
1599
1600         datalen = ids->ids_data_segment_len;
1601         if (datalen > ISCSI_MAX_DATA_SEGMENT_LENGTH)
1602                 return (EINVAL);
1603         if (datalen > 0) {
1604                 data = malloc(datalen, M_ISCSI, M_WAITOK);
1605                 error = copyin(ids->ids_data_segment, data, datalen);
1606                 if (error != 0) {
1607                         free(data, M_ISCSI);
1608                         return (error);
1609                 }
1610         }
1611
1612         ip = icl_pdu_new(is->is_conn, M_WAITOK);
1613         memcpy(ip->ip_bhs, ids->ids_bhs, sizeof(*ip->ip_bhs));
1614         if (datalen > 0) {
1615                 error = icl_pdu_append_data(ip, data, datalen, M_WAITOK);
1616                 KASSERT(error == 0, ("icl_pdu_append_data(..., M_WAITOK) failed"));
1617                 free(data, M_ISCSI);
1618         }
1619         icl_pdu_queue(ip);
1620
1621         return (0);
1622 }
1623
1624 static int
1625 iscsi_ioctl_daemon_receive(struct iscsi_softc *sc,
1626     struct iscsi_daemon_receive *idr)
1627 {
1628         struct iscsi_session *is;
1629         struct icl_pdu *ip;
1630         void *data;
1631
1632         sx_slock(&sc->sc_lock);
1633         TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1634                 if (is->is_id == idr->idr_session_id)
1635                         break;
1636         }
1637         if (is == NULL) {
1638                 sx_sunlock(&sc->sc_lock);
1639                 return (ESRCH);
1640         }
1641         sx_sunlock(&sc->sc_lock);
1642
1643         if (is->is_login_phase == false)
1644                 return (EBUSY);
1645
1646         ISCSI_SESSION_LOCK(is);
1647         while (is->is_login_pdu == NULL &&
1648             is->is_terminating == false &&
1649             is->is_reconnecting == false)
1650                 cv_wait(&is->is_login_cv, &is->is_lock);
1651         if (is->is_terminating || is->is_reconnecting) {
1652                 ISCSI_SESSION_UNLOCK(is);
1653                 return (EIO);
1654         }
1655         ip = is->is_login_pdu;
1656         is->is_login_pdu = NULL;
1657         ISCSI_SESSION_UNLOCK(is);
1658
1659         if (ip->ip_data_len > idr->idr_data_segment_len) {
1660                 icl_pdu_free(ip);
1661                 return (EMSGSIZE);
1662         }
1663
1664         copyout(ip->ip_bhs, idr->idr_bhs, sizeof(*ip->ip_bhs));
1665         if (ip->ip_data_len > 0) {
1666                 data = malloc(ip->ip_data_len, M_ISCSI, M_WAITOK);
1667                 icl_pdu_get_data(ip, 0, data, ip->ip_data_len);
1668                 copyout(data, idr->idr_data_segment, ip->ip_data_len);
1669                 free(data, M_ISCSI);
1670         }
1671
1672         icl_pdu_free(ip);
1673
1674         return (0);
1675 }
1676 #endif /* ICL_KERNEL_PROXY */
1677
1678 static void
1679 iscsi_sanitize_session_conf(struct iscsi_session_conf *isc)
1680 {
1681         /*
1682          * Just make sure all the fields are null-terminated.
1683          *
1684          * XXX: This is not particularly secure.  We should
1685          *      create our own conf and then copy in relevant
1686          *      fields.
1687          */
1688         isc->isc_initiator[ISCSI_NAME_LEN - 1] = '\0';
1689         isc->isc_initiator_addr[ISCSI_ADDR_LEN - 1] = '\0';
1690         isc->isc_initiator_alias[ISCSI_ALIAS_LEN - 1] = '\0';
1691         isc->isc_target[ISCSI_NAME_LEN - 1] = '\0';
1692         isc->isc_target_addr[ISCSI_ADDR_LEN - 1] = '\0';
1693         isc->isc_user[ISCSI_NAME_LEN - 1] = '\0';
1694         isc->isc_secret[ISCSI_SECRET_LEN - 1] = '\0';
1695         isc->isc_mutual_user[ISCSI_NAME_LEN - 1] = '\0';
1696         isc->isc_mutual_secret[ISCSI_SECRET_LEN - 1] = '\0';
1697 }
1698
1699 static bool
1700 iscsi_valid_session_conf(const struct iscsi_session_conf *isc)
1701 {
1702
1703         if (isc->isc_initiator[0] == '\0') {
1704                 ISCSI_DEBUG("empty isc_initiator");
1705                 return (false);
1706         }
1707
1708         if (isc->isc_target_addr[0] == '\0') {
1709                 ISCSI_DEBUG("empty isc_target_addr");
1710                 return (false);
1711         }
1712
1713         if (isc->isc_discovery != 0 && isc->isc_target[0] != 0) {
1714                 ISCSI_DEBUG("non-empty isc_target for discovery session");
1715                 return (false);
1716         }
1717
1718         if (isc->isc_discovery == 0 && isc->isc_target[0] == 0) {
1719                 ISCSI_DEBUG("empty isc_target for non-discovery session");
1720                 return (false);
1721         }
1722
1723         return (true);
1724 }
1725
1726 static int
1727 iscsi_ioctl_session_add(struct iscsi_softc *sc, struct iscsi_session_add *isa)
1728 {
1729         struct iscsi_session *is;
1730         const struct iscsi_session *is2;
1731         int error;
1732
1733         iscsi_sanitize_session_conf(&isa->isa_conf);
1734         if (iscsi_valid_session_conf(&isa->isa_conf) == false)
1735                 return (EINVAL);
1736
1737         is = malloc(sizeof(*is), M_ISCSI, M_ZERO | M_WAITOK);
1738         memcpy(&is->is_conf, &isa->isa_conf, sizeof(is->is_conf));
1739
1740         sx_xlock(&sc->sc_lock);
1741
1742         /*
1743          * Prevent duplicates.
1744          */
1745         TAILQ_FOREACH(is2, &sc->sc_sessions, is_next) {
1746                 if (!!is->is_conf.isc_discovery !=
1747                     !!is2->is_conf.isc_discovery)
1748                         continue;
1749
1750                 if (strcmp(is->is_conf.isc_target_addr,
1751                     is2->is_conf.isc_target_addr) != 0)
1752                         continue;
1753
1754                 if (is->is_conf.isc_discovery == 0 &&
1755                     strcmp(is->is_conf.isc_target,
1756                     is2->is_conf.isc_target) != 0)
1757                         continue;
1758
1759                 sx_xunlock(&sc->sc_lock);
1760                 free(is, M_ISCSI);
1761                 return (EBUSY);
1762         }
1763
1764         is->is_conn = icl_new_conn(is->is_conf.isc_offload,
1765             "iscsi", &is->is_lock);
1766         if (is->is_conn == NULL) {
1767                 sx_xunlock(&sc->sc_lock);
1768                 free(is, M_ISCSI);
1769                 return (EINVAL);
1770         }
1771         is->is_conn->ic_receive = iscsi_receive_callback;
1772         is->is_conn->ic_error = iscsi_error_callback;
1773         is->is_conn->ic_prv0 = is;
1774         TAILQ_INIT(&is->is_outstanding);
1775         STAILQ_INIT(&is->is_postponed);
1776         mtx_init(&is->is_lock, "iscsi_lock", NULL, MTX_DEF);
1777         cv_init(&is->is_maintenance_cv, "iscsi_mt");
1778 #ifdef ICL_KERNEL_PROXY
1779         cv_init(&is->is_login_cv, "iscsi_login");
1780 #endif
1781
1782         is->is_softc = sc;
1783         sc->sc_last_session_id++;
1784         is->is_id = sc->sc_last_session_id;
1785         is->is_isid[0] = 0x80; /* RFC 3720, 10.12.5: 10b, "Random" ISID. */
1786         arc4rand(&is->is_isid[1], 5, 0);
1787         is->is_tsih = 0;
1788         callout_init(&is->is_callout, 1);
1789
1790         error = kthread_add(iscsi_maintenance_thread, is, NULL, NULL, 0, 0, "iscsimt");
1791         if (error != 0) {
1792                 ISCSI_SESSION_WARN(is, "kthread_add(9) failed with error %d", error);
1793                 sx_xunlock(&sc->sc_lock);
1794                 return (error);
1795         }
1796
1797         callout_reset(&is->is_callout, 1 * hz, iscsi_callout, is);
1798         TAILQ_INSERT_TAIL(&sc->sc_sessions, is, is_next);
1799
1800         /*
1801          * Trigger immediate reconnection.
1802          */
1803         ISCSI_SESSION_LOCK(is);
1804         is->is_waiting_for_iscsid = true;
1805         strlcpy(is->is_reason, "Waiting for iscsid(8)", sizeof(is->is_reason));
1806         ISCSI_SESSION_UNLOCK(is);
1807         cv_signal(&sc->sc_cv);
1808
1809         sx_xunlock(&sc->sc_lock);
1810
1811         return (0);
1812 }
1813
1814 static bool
1815 iscsi_session_conf_matches(unsigned int id1, const struct iscsi_session_conf *c1,
1816     unsigned int id2, const struct iscsi_session_conf *c2)
1817 {
1818
1819         if (id2 != 0 && id2 != id1)
1820                 return (false);
1821         if (c2->isc_target[0] != '\0' &&
1822             strcmp(c1->isc_target, c2->isc_target) != 0)
1823                 return (false);
1824         if (c2->isc_target_addr[0] != '\0' &&
1825             strcmp(c1->isc_target_addr, c2->isc_target_addr) != 0)
1826                 return (false);
1827         return (true);
1828 }
1829
1830 static int
1831 iscsi_ioctl_session_remove(struct iscsi_softc *sc,
1832     struct iscsi_session_remove *isr)
1833 {
1834         struct iscsi_session *is, *tmp;
1835         bool found = false;
1836
1837         iscsi_sanitize_session_conf(&isr->isr_conf);
1838
1839         sx_xlock(&sc->sc_lock);
1840         TAILQ_FOREACH_SAFE(is, &sc->sc_sessions, is_next, tmp) {
1841                 ISCSI_SESSION_LOCK(is);
1842                 if (iscsi_session_conf_matches(is->is_id, &is->is_conf,
1843                     isr->isr_session_id, &isr->isr_conf)) {
1844                         found = true;
1845                         iscsi_session_logout(is);
1846                         iscsi_session_terminate(is);
1847                 }
1848                 ISCSI_SESSION_UNLOCK(is);
1849         }
1850         sx_xunlock(&sc->sc_lock);
1851
1852         if (!found)
1853                 return (ESRCH);
1854
1855         return (0);
1856 }
1857
1858 static int
1859 iscsi_ioctl_session_list(struct iscsi_softc *sc, struct iscsi_session_list *isl)
1860 {
1861         int error;
1862         unsigned int i = 0;
1863         struct iscsi_session *is;
1864         struct iscsi_session_state iss;
1865
1866         sx_slock(&sc->sc_lock);
1867         TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1868                 if (i >= isl->isl_nentries) {
1869                         sx_sunlock(&sc->sc_lock);
1870                         return (EMSGSIZE);
1871                 }
1872                 memset(&iss, 0, sizeof(iss));
1873                 memcpy(&iss.iss_conf, &is->is_conf, sizeof(iss.iss_conf));
1874                 iss.iss_id = is->is_id;
1875                 strlcpy(iss.iss_target_alias, is->is_target_alias, sizeof(iss.iss_target_alias));
1876                 strlcpy(iss.iss_reason, is->is_reason, sizeof(iss.iss_reason));
1877                 strlcpy(iss.iss_offload, is->is_conn->ic_offload, sizeof(iss.iss_offload));
1878
1879                 if (is->is_conn->ic_header_crc32c)
1880                         iss.iss_header_digest = ISCSI_DIGEST_CRC32C;
1881                 else
1882                         iss.iss_header_digest = ISCSI_DIGEST_NONE;
1883
1884                 if (is->is_conn->ic_data_crc32c)
1885                         iss.iss_data_digest = ISCSI_DIGEST_CRC32C;
1886                 else
1887                         iss.iss_data_digest = ISCSI_DIGEST_NONE;
1888
1889                 iss.iss_max_data_segment_length = is->is_max_data_segment_length;
1890                 iss.iss_immediate_data = is->is_immediate_data;
1891                 iss.iss_connected = is->is_connected;
1892
1893                 error = copyout(&iss, isl->isl_pstates + i, sizeof(iss));
1894                 if (error != 0) {
1895                         sx_sunlock(&sc->sc_lock);
1896                         return (error);
1897                 }
1898                 i++;
1899         }
1900         sx_sunlock(&sc->sc_lock);
1901
1902         isl->isl_nentries = i;
1903
1904         return (0);
1905 }
1906
1907 static int
1908 iscsi_ioctl_session_modify(struct iscsi_softc *sc,
1909     struct iscsi_session_modify *ism)
1910 {
1911         struct iscsi_session *is;
1912
1913         iscsi_sanitize_session_conf(&ism->ism_conf);
1914         if (iscsi_valid_session_conf(&ism->ism_conf) == false)
1915                 return (EINVAL);
1916
1917         sx_xlock(&sc->sc_lock);
1918         TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1919                 ISCSI_SESSION_LOCK(is);
1920                 if (is->is_id == ism->ism_session_id)
1921                         break;
1922                 ISCSI_SESSION_UNLOCK(is);
1923         }
1924         if (is == NULL) {
1925                 sx_xunlock(&sc->sc_lock);
1926                 return (ESRCH);
1927         }
1928         sx_xunlock(&sc->sc_lock);
1929
1930         memcpy(&is->is_conf, &ism->ism_conf, sizeof(is->is_conf));
1931         ISCSI_SESSION_UNLOCK(is);
1932
1933         iscsi_session_reconnect(is);
1934
1935         return (0);
1936 }
1937
1938 static int
1939 iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, int mode,
1940     struct thread *td)
1941 {
1942         struct iscsi_softc *sc;
1943
1944         sc = dev->si_drv1;
1945
1946         switch (cmd) {
1947         case ISCSIDWAIT:
1948                 return (iscsi_ioctl_daemon_wait(sc,
1949                     (struct iscsi_daemon_request *)arg));
1950         case ISCSIDHANDOFF:
1951                 return (iscsi_ioctl_daemon_handoff(sc,
1952                     (struct iscsi_daemon_handoff *)arg));
1953         case ISCSIDFAIL:
1954                 return (iscsi_ioctl_daemon_fail(sc,
1955                     (struct iscsi_daemon_fail *)arg));
1956 #ifdef ICL_KERNEL_PROXY
1957         case ISCSIDCONNECT:
1958                 return (iscsi_ioctl_daemon_connect(sc,
1959                     (struct iscsi_daemon_connect *)arg));
1960         case ISCSIDSEND:
1961                 return (iscsi_ioctl_daemon_send(sc,
1962                     (struct iscsi_daemon_send *)arg));
1963         case ISCSIDRECEIVE:
1964                 return (iscsi_ioctl_daemon_receive(sc,
1965                     (struct iscsi_daemon_receive *)arg));
1966 #endif /* ICL_KERNEL_PROXY */
1967         case ISCSISADD:
1968                 return (iscsi_ioctl_session_add(sc,
1969                     (struct iscsi_session_add *)arg));
1970         case ISCSISREMOVE:
1971                 return (iscsi_ioctl_session_remove(sc,
1972                     (struct iscsi_session_remove *)arg));
1973         case ISCSISLIST:
1974                 return (iscsi_ioctl_session_list(sc,
1975                     (struct iscsi_session_list *)arg));
1976         case ISCSISMODIFY:
1977                 return (iscsi_ioctl_session_modify(sc,
1978                     (struct iscsi_session_modify *)arg));
1979         default:
1980                 return (EINVAL);
1981         }
1982 }
1983
1984 static struct iscsi_outstanding *
1985 iscsi_outstanding_find(struct iscsi_session *is, uint32_t initiator_task_tag)
1986 {
1987         struct iscsi_outstanding *io;
1988
1989         ISCSI_SESSION_LOCK_ASSERT(is);
1990
1991         TAILQ_FOREACH(io, &is->is_outstanding, io_next) {
1992                 if (io->io_initiator_task_tag == initiator_task_tag)
1993                         return (io);
1994         }
1995         return (NULL);
1996 }
1997
1998 static struct iscsi_outstanding *
1999 iscsi_outstanding_find_ccb(struct iscsi_session *is, union ccb *ccb)
2000 {
2001         struct iscsi_outstanding *io;
2002
2003         ISCSI_SESSION_LOCK_ASSERT(is);
2004
2005         TAILQ_FOREACH(io, &is->is_outstanding, io_next) {
2006                 if (io->io_ccb == ccb)
2007                         return (io);
2008         }
2009         return (NULL);
2010 }
2011
2012 static struct iscsi_outstanding *
2013 iscsi_outstanding_add(struct iscsi_session *is,
2014     union ccb *ccb, uint32_t *initiator_task_tagp)
2015 {
2016         struct iscsi_outstanding *io;
2017         int error;
2018
2019         ISCSI_SESSION_LOCK_ASSERT(is);
2020
2021         io = uma_zalloc(iscsi_outstanding_zone, M_NOWAIT | M_ZERO);
2022         if (io == NULL) {
2023                 ISCSI_SESSION_WARN(is, "failed to allocate %zd bytes",
2024                     sizeof(*io));
2025                 return (NULL);
2026         }
2027
2028         error = icl_conn_task_setup(is->is_conn, &ccb->csio,
2029             initiator_task_tagp, &io->io_icl_prv);
2030         if (error != 0) {
2031                 ISCSI_SESSION_WARN(is,
2032                     "icl_conn_task_setup() failed with error %d", error);
2033                 uma_zfree(iscsi_outstanding_zone, io);
2034                 return (NULL);
2035         }
2036
2037         KASSERT(iscsi_outstanding_find(is, *initiator_task_tagp) == NULL,
2038             ("initiator_task_tag 0x%x already added", *initiator_task_tagp));
2039
2040         io->io_initiator_task_tag = *initiator_task_tagp;
2041         io->io_ccb = ccb;
2042         TAILQ_INSERT_TAIL(&is->is_outstanding, io, io_next);
2043         return (io);
2044 }
2045
2046 static void
2047 iscsi_outstanding_remove(struct iscsi_session *is, struct iscsi_outstanding *io)
2048 {
2049
2050         ISCSI_SESSION_LOCK_ASSERT(is);
2051
2052         icl_conn_task_done(is->is_conn, io->io_icl_prv);
2053         TAILQ_REMOVE(&is->is_outstanding, io, io_next);
2054         uma_zfree(iscsi_outstanding_zone, io);
2055 }
2056
2057 static void
2058 iscsi_action_abort(struct iscsi_session *is, union ccb *ccb)
2059 {
2060         struct icl_pdu *request;
2061         struct iscsi_bhs_task_management_request *bhstmr;
2062         struct ccb_abort *cab = &ccb->cab;
2063         struct iscsi_outstanding *io, *aio;
2064         uint32_t initiator_task_tag;
2065
2066         ISCSI_SESSION_LOCK_ASSERT(is);
2067
2068 #if 0
2069         KASSERT(is->is_login_phase == false, ("%s called during Login Phase", __func__));
2070 #else
2071         if (is->is_login_phase) {
2072                 ccb->ccb_h.status = CAM_REQ_ABORTED;
2073                 xpt_done(ccb);
2074                 return;
2075         }
2076 #endif
2077
2078         aio = iscsi_outstanding_find_ccb(is, cab->abort_ccb);
2079         if (aio == NULL) {
2080                 ccb->ccb_h.status = CAM_REQ_CMP;
2081                 xpt_done(ccb);
2082                 return;
2083         }
2084
2085         request = icl_pdu_new(is->is_conn, M_NOWAIT);
2086         if (request == NULL) {
2087                 ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
2088                 xpt_done(ccb);
2089                 return;
2090         }
2091
2092         initiator_task_tag = is->is_initiator_task_tag++;
2093
2094         io = iscsi_outstanding_add(is, NULL, &initiator_task_tag);
2095         if (io == NULL) {
2096                 icl_pdu_free(request);
2097                 ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
2098                 xpt_done(ccb);
2099                 return;
2100         }
2101         io->io_datasn = aio->io_initiator_task_tag;
2102
2103         bhstmr = (struct iscsi_bhs_task_management_request *)request->ip_bhs;
2104         bhstmr->bhstmr_opcode = ISCSI_BHS_OPCODE_TASK_REQUEST;
2105         bhstmr->bhstmr_function = 0x80 | BHSTMR_FUNCTION_ABORT_TASK;
2106         bhstmr->bhstmr_lun = htobe64(CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun));
2107         bhstmr->bhstmr_initiator_task_tag = initiator_task_tag;
2108         bhstmr->bhstmr_referenced_task_tag = aio->io_initiator_task_tag;
2109
2110         iscsi_pdu_queue_locked(request);
2111 }
2112
2113 static void
2114 iscsi_action_scsiio(struct iscsi_session *is, union ccb *ccb)
2115 {
2116         struct icl_pdu *request;
2117         struct iscsi_bhs_scsi_command *bhssc;
2118         struct ccb_scsiio *csio;
2119         struct iscsi_outstanding *io;
2120         size_t len;
2121         uint32_t initiator_task_tag;
2122         int error;
2123
2124         ISCSI_SESSION_LOCK_ASSERT(is);
2125
2126 #if 0
2127         KASSERT(is->is_login_phase == false, ("%s called during Login Phase", __func__));
2128 #else
2129         if (is->is_login_phase) {
2130                 ISCSI_SESSION_DEBUG(is, "called during login phase");
2131                 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
2132                         xpt_freeze_devq(ccb->ccb_h.path, 1);
2133                         ISCSI_SESSION_DEBUG(is, "freezing devq");
2134                 }
2135                 ccb->ccb_h.status = CAM_REQ_ABORTED | CAM_DEV_QFRZN;
2136                 xpt_done(ccb);
2137                 return;
2138         }
2139 #endif
2140
2141         request = icl_pdu_new(is->is_conn, M_NOWAIT);
2142         if (request == NULL) {
2143                 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
2144                         xpt_freeze_devq(ccb->ccb_h.path, 1);
2145                         ISCSI_SESSION_DEBUG(is, "freezing devq");
2146                 }
2147                 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN;
2148                 xpt_done(ccb);
2149                 return;
2150         }
2151
2152         initiator_task_tag = is->is_initiator_task_tag++;
2153         io = iscsi_outstanding_add(is, ccb, &initiator_task_tag);
2154         if (io == NULL) {
2155                 icl_pdu_free(request);
2156                 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
2157                         xpt_freeze_devq(ccb->ccb_h.path, 1);
2158                         ISCSI_SESSION_DEBUG(is, "freezing devq");
2159                 }
2160                 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN;
2161                 xpt_done(ccb);
2162                 return;
2163         }
2164
2165         csio = &ccb->csio;
2166         bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs;
2167         bhssc->bhssc_opcode = ISCSI_BHS_OPCODE_SCSI_COMMAND;
2168         bhssc->bhssc_flags |= BHSSC_FLAGS_F;
2169         switch (csio->ccb_h.flags & CAM_DIR_MASK) {
2170         case CAM_DIR_IN:
2171                 bhssc->bhssc_flags |= BHSSC_FLAGS_R;
2172                 break;
2173         case CAM_DIR_OUT:
2174                 bhssc->bhssc_flags |= BHSSC_FLAGS_W;
2175                 break;
2176         }
2177
2178         if ((ccb->ccb_h.flags & CAM_TAG_ACTION_VALID) != 0) {
2179                 switch (csio->tag_action) {
2180                 case MSG_HEAD_OF_Q_TAG:
2181                         bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_HOQ;
2182                         break;
2183                 case MSG_ORDERED_Q_TAG:
2184                         bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_ORDERED;
2185                         break;
2186                 case MSG_ACA_TASK:
2187                         bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_ACA;
2188                         break;
2189                 case MSG_SIMPLE_Q_TAG:
2190                 default:
2191                         bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_SIMPLE;
2192                         break;
2193                 }
2194         } else
2195                 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_UNTAGGED;
2196
2197         bhssc->bhssc_lun = htobe64(CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun));
2198         bhssc->bhssc_initiator_task_tag = initiator_task_tag;
2199         bhssc->bhssc_expected_data_transfer_length = htonl(csio->dxfer_len);
2200         KASSERT(csio->cdb_len <= sizeof(bhssc->bhssc_cdb),
2201             ("unsupported CDB size %zd", (size_t)csio->cdb_len));
2202
2203         if (csio->ccb_h.flags & CAM_CDB_POINTER)
2204                 memcpy(&bhssc->bhssc_cdb, csio->cdb_io.cdb_ptr, csio->cdb_len);
2205         else
2206                 memcpy(&bhssc->bhssc_cdb, csio->cdb_io.cdb_bytes, csio->cdb_len);
2207
2208         if (is->is_immediate_data &&
2209             (csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT) {
2210                 len = csio->dxfer_len;
2211                 //ISCSI_SESSION_DEBUG(is, "adding %zd of immediate data", len);
2212                 if (len > is->is_first_burst_length) {
2213                         ISCSI_SESSION_DEBUG(is, "len %zd -> %zd", len, is->is_first_burst_length);
2214                         len = is->is_first_burst_length;
2215                 }
2216                 if (len > is->is_max_data_segment_length) {
2217                         ISCSI_SESSION_DEBUG(is, "len %zd -> %zd", len, is->is_max_data_segment_length);
2218                         len = is->is_max_data_segment_length;
2219                 }
2220
2221                 error = icl_pdu_append_data(request, csio->data_ptr, len, M_NOWAIT);
2222                 if (error != 0) {
2223                         icl_pdu_free(request);
2224                         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
2225                                 xpt_freeze_devq(ccb->ccb_h.path, 1);
2226                                 ISCSI_SESSION_DEBUG(is, "freezing devq");
2227                         }
2228                         ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN;
2229                         xpt_done(ccb);
2230                         return;
2231                 }
2232         }
2233         iscsi_pdu_queue_locked(request);
2234 }
2235
2236 static void
2237 iscsi_action(struct cam_sim *sim, union ccb *ccb)
2238 {
2239         struct iscsi_session *is;
2240
2241         is = cam_sim_softc(sim);
2242
2243         ISCSI_SESSION_LOCK_ASSERT(is);
2244
2245         if (is->is_terminating ||
2246             (is->is_connected == false && fail_on_disconnection)) {
2247                 ccb->ccb_h.status = CAM_DEV_NOT_THERE;
2248                 xpt_done(ccb);
2249                 return;
2250         }
2251
2252         switch (ccb->ccb_h.func_code) {
2253         case XPT_PATH_INQ:
2254         {
2255                 struct ccb_pathinq *cpi = &ccb->cpi;
2256
2257                 cpi->version_num = 1;
2258                 cpi->hba_inquiry = PI_TAG_ABLE;
2259                 cpi->target_sprt = 0;
2260                 cpi->hba_misc = PIM_EXTLUNS;
2261                 cpi->hba_eng_cnt = 0;
2262                 cpi->max_target = 0;
2263                 /*
2264                  * Note that the variable below is only relevant for targets
2265                  * that don't claim compliance with anything above SPC2, which
2266                  * means they don't support REPORT_LUNS.
2267                  */
2268                 cpi->max_lun = 255;
2269                 cpi->initiator_id = ~0;
2270                 strlcpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
2271                 strlcpy(cpi->hba_vid, "iSCSI", HBA_IDLEN);
2272                 strlcpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN);
2273                 cpi->unit_number = cam_sim_unit(sim);
2274                 cpi->bus_id = cam_sim_bus(sim);
2275                 cpi->base_transfer_speed = 150000; /* XXX */
2276                 cpi->transport = XPORT_ISCSI;
2277                 cpi->transport_version = 0;
2278                 cpi->protocol = PROTO_SCSI;
2279                 cpi->protocol_version = SCSI_REV_SPC3;
2280                 cpi->maxio = MAXPHYS;
2281                 cpi->ccb_h.status = CAM_REQ_CMP;
2282                 break;
2283         }
2284         case XPT_GET_TRAN_SETTINGS:
2285         {
2286                 struct ccb_trans_settings       *cts;
2287                 struct ccb_trans_settings_scsi  *scsi;
2288
2289                 cts = &ccb->cts;
2290                 scsi = &cts->proto_specific.scsi;
2291
2292                 cts->protocol = PROTO_SCSI;
2293                 cts->protocol_version = SCSI_REV_SPC3;
2294                 cts->transport = XPORT_ISCSI;
2295                 cts->transport_version = 0;
2296                 scsi->valid = CTS_SCSI_VALID_TQ;
2297                 scsi->flags = CTS_SCSI_FLAGS_TAG_ENB;
2298                 cts->ccb_h.status = CAM_REQ_CMP;
2299                 break;
2300         }
2301         case XPT_CALC_GEOMETRY:
2302                 cam_calc_geometry(&ccb->ccg, /*extended*/1);
2303                 ccb->ccb_h.status = CAM_REQ_CMP;
2304                 break;
2305 #if 0
2306         /*
2307          * XXX: What's the point?
2308          */
2309         case XPT_RESET_BUS:
2310         case XPT_TERM_IO:
2311                 ISCSI_SESSION_DEBUG(is, "faking success for reset, abort, or term_io");
2312                 ccb->ccb_h.status = CAM_REQ_CMP;
2313                 break;
2314 #endif
2315         case XPT_ABORT:
2316                 iscsi_action_abort(is, ccb);
2317                 return;
2318         case XPT_SCSI_IO:
2319                 iscsi_action_scsiio(is, ccb);
2320                 return;
2321         default:
2322 #if 0
2323                 ISCSI_SESSION_DEBUG(is, "got unsupported code 0x%x", ccb->ccb_h.func_code);
2324 #endif
2325                 ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
2326                 break;
2327         }
2328         xpt_done(ccb);
2329 }
2330
2331 static void
2332 iscsi_poll(struct cam_sim *sim)
2333 {
2334
2335         KASSERT(0, ("%s: you're not supposed to be here", __func__));
2336 }
2337
2338 static void
2339 iscsi_terminate_sessions(struct iscsi_softc *sc)
2340 {
2341         struct iscsi_session *is;
2342
2343         sx_slock(&sc->sc_lock);
2344         TAILQ_FOREACH(is, &sc->sc_sessions, is_next)
2345                 iscsi_session_terminate(is);
2346         while(!TAILQ_EMPTY(&sc->sc_sessions)) {
2347                 ISCSI_DEBUG("waiting for sessions to terminate");
2348                 cv_wait(&sc->sc_cv, &sc->sc_lock);
2349         }
2350         ISCSI_DEBUG("all sessions terminated");
2351         sx_sunlock(&sc->sc_lock);
2352 }
2353
2354 static void
2355 iscsi_shutdown_pre(struct iscsi_softc *sc)
2356 {
2357         struct iscsi_session *is;
2358
2359         if (!fail_on_shutdown)
2360                 return;
2361
2362         /*
2363          * If we have any sessions waiting for reconnection, request
2364          * maintenance thread to fail them immediately instead of waiting
2365          * for reconnect timeout.
2366          *
2367          * This prevents LUNs with mounted filesystems that are supported
2368          * by disconnected iSCSI sessions from hanging, however it will
2369          * fail all queued BIOs.
2370          */
2371         ISCSI_DEBUG("forcing failing all disconnected sessions due to shutdown");
2372
2373         fail_on_disconnection = 1;
2374
2375         sx_slock(&sc->sc_lock);
2376         TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
2377                 ISCSI_SESSION_LOCK(is);
2378                 if (!is->is_connected) {
2379                         ISCSI_SESSION_DEBUG(is, "force failing disconnected session early");
2380                         iscsi_session_reconnect(is);
2381                 }
2382                 ISCSI_SESSION_UNLOCK(is);
2383         }
2384         sx_sunlock(&sc->sc_lock);
2385 }
2386
2387 static void
2388 iscsi_shutdown_post(struct iscsi_softc *sc)
2389 {
2390
2391         ISCSI_DEBUG("removing all sessions due to shutdown");
2392         iscsi_terminate_sessions(sc);
2393 }
2394
2395 static int
2396 iscsi_load(void)
2397 {
2398         int error;
2399
2400         sc = malloc(sizeof(*sc), M_ISCSI, M_ZERO | M_WAITOK);
2401         sx_init(&sc->sc_lock, "iscsi");
2402         TAILQ_INIT(&sc->sc_sessions);
2403         cv_init(&sc->sc_cv, "iscsi_cv");
2404
2405         iscsi_outstanding_zone = uma_zcreate("iscsi_outstanding",
2406             sizeof(struct iscsi_outstanding), NULL, NULL, NULL, NULL,
2407             UMA_ALIGN_PTR, 0);
2408
2409         error = make_dev_p(MAKEDEV_CHECKNAME, &sc->sc_cdev, &iscsi_cdevsw,
2410             NULL, UID_ROOT, GID_WHEEL, 0600, "iscsi");
2411         if (error != 0) {
2412                 ISCSI_WARN("failed to create device node, error %d", error);
2413                 return (error);
2414         }
2415         sc->sc_cdev->si_drv1 = sc;
2416
2417         sc->sc_shutdown_pre_eh = EVENTHANDLER_REGISTER(shutdown_pre_sync,
2418             iscsi_shutdown_pre, sc, SHUTDOWN_PRI_FIRST);
2419         /*
2420          * shutdown_post_sync needs to run after filesystem shutdown and before
2421          * CAM shutdown - otherwise when rebooting with an iSCSI session that is
2422          * disconnected but has outstanding requests, dashutdown() will hang on
2423          * cam_periph_runccb().
2424          */
2425         sc->sc_shutdown_post_eh = EVENTHANDLER_REGISTER(shutdown_post_sync,
2426             iscsi_shutdown_post, sc, SHUTDOWN_PRI_DEFAULT - 1);
2427
2428         return (0);
2429 }
2430
2431 static int
2432 iscsi_unload(void)
2433 {
2434
2435         if (sc->sc_cdev != NULL) {
2436                 ISCSI_DEBUG("removing device node");
2437                 destroy_dev(sc->sc_cdev);
2438                 ISCSI_DEBUG("device node removed");
2439         }
2440
2441         if (sc->sc_shutdown_pre_eh != NULL)
2442                 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, sc->sc_shutdown_pre_eh);
2443         if (sc->sc_shutdown_post_eh != NULL)
2444                 EVENTHANDLER_DEREGISTER(shutdown_post_sync, sc->sc_shutdown_post_eh);
2445
2446         iscsi_terminate_sessions(sc);
2447
2448         uma_zdestroy(iscsi_outstanding_zone);
2449         sx_destroy(&sc->sc_lock);
2450         cv_destroy(&sc->sc_cv);
2451         free(sc, M_ISCSI);
2452         return (0);
2453 }
2454
2455 static int
2456 iscsi_quiesce(void)
2457 {
2458         sx_slock(&sc->sc_lock);
2459         if (!TAILQ_EMPTY(&sc->sc_sessions)) {
2460                 sx_sunlock(&sc->sc_lock);
2461                 return (EBUSY);
2462         }
2463         sx_sunlock(&sc->sc_lock);
2464         return (0);
2465 }
2466
2467 static int
2468 iscsi_modevent(module_t mod, int what, void *arg)
2469 {
2470         int error;
2471
2472         switch (what) {
2473         case MOD_LOAD:
2474                 error = iscsi_load();
2475                 break;
2476         case MOD_UNLOAD:
2477                 error = iscsi_unload();
2478                 break;
2479         case MOD_QUIESCE:
2480                 error = iscsi_quiesce();
2481                 break;
2482         default:
2483                 error = EINVAL;
2484                 break;
2485         }
2486         return (error);
2487 }
2488
2489 moduledata_t iscsi_data = {
2490         "iscsi",
2491         iscsi_modevent,
2492         0
2493 };
2494
2495 DECLARE_MODULE(iscsi, iscsi_data, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
2496 MODULE_DEPEND(iscsi, cam, 1, 1, 1);
2497 MODULE_DEPEND(iscsi, icl, 1, 1, 1);