sys/dev/iscsi/iscsi.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2012 The FreeBSD Foundation
   5  * All rights reserved.
   6  *
   7  * This software was developed by Edward Tomasz Napierala under sponsorship
   8  * from the FreeBSD Foundation.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <sys/param.h>
  37 #include <sys/condvar.h>
  38 #include <sys/conf.h>
  39 #include <sys/endian.h>
  40 #include <sys/eventhandler.h>
  41 #include <sys/file.h>
  42 #include <sys/kernel.h>
  43 #include <sys/kthread.h>
  44 #include <sys/lock.h>
  45 #include <sys/malloc.h>
  46 #include <sys/mutex.h>
  47 #include <sys/module.h>
  48 #include <sys/socket.h>
  49 #include <sys/sysctl.h>
  50 #include <sys/systm.h>
  51 #include <sys/sx.h>
  52 #include <vm/uma.h>
  53
  54 #include <cam/cam.h>
  55 #include <cam/cam_ccb.h>
  56 #include <cam/cam_xpt.h>
  57 #include <cam/cam_debug.h>
  58 #include <cam/cam_sim.h>
  59 #include <cam/cam_xpt_sim.h>
  60 #include <cam/cam_xpt_periph.h>
  61 #include <cam/cam_periph.h>
  62 #include <cam/scsi/scsi_all.h>
  63 #include <cam/scsi/scsi_message.h>
  64
  65 #include <dev/iscsi/icl.h>
  66 #include <dev/iscsi/icl_wrappers.h>
  67 #include <dev/iscsi/iscsi_ioctl.h>
  68 #include <dev/iscsi/iscsi_proto.h>
  69 #include <dev/iscsi/iscsi.h>
  70
  71 #ifdef ICL_KERNEL_PROXY
  72 #include <sys/socketvar.h>
  73 #endif
  74
  75 #ifdef ICL_KERNEL_PROXY
  76 FEATURE(iscsi_kernel_proxy, "iSCSI initiator built with ICL_KERNEL_PROXY");
  77 #endif
  78
  79 /*
  80  * XXX: This is global so the iscsi_unload() can access it.
  81  *      Think about how to do this properly.
  82  */
  83 static struct iscsi_softc       *sc;
  84
  85 SYSCTL_NODE(_kern, OID_AUTO, iscsi, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
  86     "iSCSI initiator");
  87 static int debug = 1;
  88 SYSCTL_INT(_kern_iscsi, OID_AUTO, debug, CTLFLAG_RWTUN,
  89     &debug, 0, "Enable debug messages");
  90 static int ping_timeout = 5;
  91 SYSCTL_INT(_kern_iscsi, OID_AUTO, ping_timeout, CTLFLAG_RWTUN, &ping_timeout,
  92     0, "Timeout for ping (NOP-Out) requests, in seconds");
  93 static int iscsid_timeout = 60;
  94 SYSCTL_INT(_kern_iscsi, OID_AUTO, iscsid_timeout, CTLFLAG_RWTUN, &iscsid_timeout,
  95     0, "Time to wait for iscsid(8) to handle reconnection, in seconds");
  96 static int login_timeout = 60;
  97 SYSCTL_INT(_kern_iscsi, OID_AUTO, login_timeout, CTLFLAG_RWTUN, &login_timeout,
  98     0, "Time to wait for iscsid(8) to finish Login Phase, in seconds");
  99 static int maxtags = 255;
 100 SYSCTL_INT(_kern_iscsi, OID_AUTO, maxtags, CTLFLAG_RWTUN, &maxtags,
 101     0, "Max number of IO requests queued");
 102 static int fail_on_disconnection = 0;
 103 SYSCTL_INT(_kern_iscsi, OID_AUTO, fail_on_disconnection, CTLFLAG_RWTUN,
 104     &fail_on_disconnection, 0, "Destroy CAM SIM on connection failure");
 105 static int fail_on_shutdown = 1;
 106 SYSCTL_INT(_kern_iscsi, OID_AUTO, fail_on_shutdown, CTLFLAG_RWTUN,
 107     &fail_on_shutdown, 0, "Fail disconnected sessions on shutdown");
 108
 109 static MALLOC_DEFINE(M_ISCSI, "iSCSI", "iSCSI initiator");
 110 static uma_zone_t iscsi_outstanding_zone;
 111
 112 #define CONN_SESSION(X) ((struct iscsi_session *)X->ic_prv0)
 113 #define PDU_SESSION(X)  (CONN_SESSION(X->ip_conn))
 114
 115 #define ISCSI_DEBUG(X, ...)                                             \
 116         do {                                                            \
 117                 if (debug > 1)                                          \
 118                         printf("%s: " X "\n", __func__, ## __VA_ARGS__);\
 119         } while (0)
 120
 121 #define ISCSI_WARN(X, ...)                                              \
 122         do {                                                            \
 123                 if (debug > 0) {                                        \
 124                         printf("WARNING: %s: " X "\n",                  \
 125                             __func__, ## __VA_ARGS__);                  \
 126                 }                                                       \
 127         } while (0)
 128
 129 #define ISCSI_SESSION_DEBUG(S, X, ...)                                  \
 130         do {                                                            \
 131                 if (debug > 1) {                                        \
 132                         printf("%s: %s (%s): " X "\n",                  \
 133                             __func__, S->is_conf.isc_target_addr,       \
 134                             S->is_conf.isc_target, ## __VA_ARGS__);     \
 135                 }                                                       \
 136         } while (0)
 137
 138 #define ISCSI_SESSION_WARN(S, X, ...)                                   \
 139         do {                                                            \
 140                 if (debug > 0) {                                        \
 141                         printf("WARNING: %s (%s): " X "\n",             \
 142                             S->is_conf.isc_target_addr,                 \
 143                             S->is_conf.isc_target, ## __VA_ARGS__);     \
 144                 }                                                       \
 145         } while (0)
 146
 147 #define ISCSI_SESSION_LOCK(X)           mtx_lock(&X->is_lock)
 148 #define ISCSI_SESSION_UNLOCK(X)         mtx_unlock(&X->is_lock)
 149 #define ISCSI_SESSION_LOCK_ASSERT(X)    mtx_assert(&X->is_lock, MA_OWNED)
 150 #define ISCSI_SESSION_LOCK_ASSERT_NOT(X) mtx_assert(&X->is_lock, MA_NOTOWNED)
 151
 152 static int      iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg,
 153                     int mode, struct thread *td);
 154
 155 static struct cdevsw iscsi_cdevsw = {
 156      .d_version = D_VERSION,
 157      .d_ioctl   = iscsi_ioctl,
 158      .d_name    = "iscsi",
 159 };
 160
 161 static void     iscsi_pdu_queue_locked(struct icl_pdu *request);
 162 static void     iscsi_pdu_queue(struct icl_pdu *request);
 163 static void     iscsi_pdu_update_statsn(const struct icl_pdu *response);
 164 static void     iscsi_pdu_handle_nop_in(struct icl_pdu *response);
 165 static void     iscsi_pdu_handle_scsi_response(struct icl_pdu *response);
 166 static void     iscsi_pdu_handle_task_response(struct icl_pdu *response);
 167 static void     iscsi_pdu_handle_data_in(struct icl_pdu *response);
 168 static void     iscsi_pdu_handle_logout_response(struct icl_pdu *response);
 169 static void     iscsi_pdu_handle_r2t(struct icl_pdu *response);
 170 static void     iscsi_pdu_handle_async_message(struct icl_pdu *response);
 171 static void     iscsi_pdu_handle_reject(struct icl_pdu *response);
 172 static void     iscsi_session_reconnect(struct iscsi_session *is);
 173 static void     iscsi_session_terminate(struct iscsi_session *is);
 174 static void     iscsi_action(struct cam_sim *sim, union ccb *ccb);
 175 static void     iscsi_poll(struct cam_sim *sim);
 176 static struct iscsi_outstanding *iscsi_outstanding_find(struct iscsi_session *is,
 177                     uint32_t initiator_task_tag);
 178 static struct iscsi_outstanding *iscsi_outstanding_add(struct iscsi_session *is,
 179                     struct icl_pdu *request, union ccb *ccb,
 180                     uint32_t *initiator_task_tagp);
 181 static void     iscsi_outstanding_remove(struct iscsi_session *is,
 182                     struct iscsi_outstanding *io);
 183
 184 static bool
 185 iscsi_pdu_prepare(struct icl_pdu *request)
 186 {
 187         struct iscsi_session *is;
 188         struct iscsi_bhs_scsi_command *bhssc;
 189
 190         is = PDU_SESSION(request);
 191
 192         ISCSI_SESSION_LOCK_ASSERT(is);
 193
 194         /*
 195          * We're only using fields common for all the request
 196          * (initiator -> target) PDUs.
 197          */
 198         bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs;
 199
 200         /*
 201          * Data-Out PDU does not contain CmdSN.
 202          */
 203         if (bhssc->bhssc_opcode != ISCSI_BHS_OPCODE_SCSI_DATA_OUT) {
 204                 if (ISCSI_SNGT(is->is_cmdsn, is->is_maxcmdsn) &&
 205                     (bhssc->bhssc_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0) {
 206                         /*
 207                          * Current MaxCmdSN prevents us from sending any more
 208                          * SCSI Command PDUs to the target; postpone the PDU.
 209                          * It will get resent by either iscsi_pdu_queue(),
 210                          * or by maintenance thread.
 211                          */
 212 #if 0
 213                         ISCSI_SESSION_DEBUG(is, "postponing send, CmdSN %u, "
 214                             "ExpCmdSN %u, MaxCmdSN %u, opcode 0x%x",
 215                             is->is_cmdsn, is->is_expcmdsn, is->is_maxcmdsn,
 216                             bhssc->bhssc_opcode);
 217 #endif
 218                         return (true);
 219                 }
 220                 bhssc->bhssc_cmdsn = htonl(is->is_cmdsn);
 221                 if ((bhssc->bhssc_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0)
 222                         is->is_cmdsn++;
 223         }
 224         bhssc->bhssc_expstatsn = htonl(is->is_statsn + 1);
 225
 226         return (false);
 227 }
 228
 229 static void
 230 iscsi_session_send_postponed(struct iscsi_session *is)
 231 {
 232         struct icl_pdu *request;
 233         bool postpone;
 234
 235         ISCSI_SESSION_LOCK_ASSERT(is);
 236
 237         if (STAILQ_EMPTY(&is->is_postponed))
 238                 return;
 239         while ((request = STAILQ_FIRST(&is->is_postponed)) != NULL) {
 240                 postpone = iscsi_pdu_prepare(request);
 241                 if (postpone)
 242                         return;
 243                 STAILQ_REMOVE_HEAD(&is->is_postponed, ip_next);
 244                 icl_pdu_queue(request);
 245         }
 246         xpt_release_simq(is->is_sim, 1);
 247 }
 248
 249 static void
 250 iscsi_pdu_queue_locked(struct icl_pdu *request)
 251 {
 252         struct iscsi_session *is;
 253         bool postpone;
 254
 255         is = PDU_SESSION(request);
 256         ISCSI_SESSION_LOCK_ASSERT(is);
 257         iscsi_session_send_postponed(is);
 258         postpone = iscsi_pdu_prepare(request);
 259         if (postpone) {
 260                 if (STAILQ_EMPTY(&is->is_postponed))
 261                         xpt_freeze_simq(is->is_sim, 1);
 262                 STAILQ_INSERT_TAIL(&is->is_postponed, request, ip_next);
 263                 return;
 264         }
 265         icl_pdu_queue(request);
 266 }
 267
 268 static void
 269 iscsi_pdu_queue(struct icl_pdu *request)
 270 {
 271         struct iscsi_session *is;
 272
 273         is = PDU_SESSION(request);
 274         ISCSI_SESSION_LOCK(is);
 275         iscsi_pdu_queue_locked(request);
 276         ISCSI_SESSION_UNLOCK(is);
 277 }
 278
 279 static void
 280 iscsi_session_logout(struct iscsi_session *is)
 281 {
 282         struct icl_pdu *request;
 283         struct iscsi_bhs_logout_request *bhslr;
 284
 285         request = icl_pdu_new(is->is_conn, M_NOWAIT);
 286         if (request == NULL)
 287                 return;
 288
 289         bhslr = (struct iscsi_bhs_logout_request *)request->ip_bhs;
 290         bhslr->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_REQUEST;
 291         bhslr->bhslr_reason = BHSLR_REASON_CLOSE_SESSION;
 292         iscsi_pdu_queue_locked(request);
 293 }
 294
 295 static void
 296 iscsi_session_terminate_task(struct iscsi_session *is,
 297     struct iscsi_outstanding *io, cam_status status)
 298 {
 299
 300         ISCSI_SESSION_LOCK_ASSERT(is);
 301
 302         if (io->io_ccb != NULL) {
 303                 io->io_ccb->ccb_h.status &= ~(CAM_SIM_QUEUED | CAM_STATUS_MASK);
 304                 io->io_ccb->ccb_h.status |= status;
 305                 if ((io->io_ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
 306                         io->io_ccb->ccb_h.status |= CAM_DEV_QFRZN;
 307                         xpt_freeze_devq(io->io_ccb->ccb_h.path, 1);
 308                         ISCSI_SESSION_DEBUG(is, "freezing devq");
 309                 }
 310                 xpt_done(io->io_ccb);
 311         }
 312         iscsi_outstanding_remove(is, io);
 313 }
 314
 315 static void
 316 iscsi_session_terminate_tasks(struct iscsi_session *is, cam_status status)
 317 {
 318         struct iscsi_outstanding *io, *tmp;
 319
 320         ISCSI_SESSION_LOCK_ASSERT(is);
 321
 322         TAILQ_FOREACH_SAFE(io, &is->is_outstanding, io_next, tmp) {
 323                 iscsi_session_terminate_task(is, io, status);
 324         }
 325 }
 326
 327 static void
 328 iscsi_session_cleanup(struct iscsi_session *is, bool destroy_sim)
 329 {
 330         struct icl_pdu *pdu;
 331
 332         ISCSI_SESSION_LOCK_ASSERT(is);
 333
 334         /*
 335          * Don't queue any new PDUs.
 336          */
 337         if (is->is_sim != NULL && is->is_simq_frozen == false) {
 338                 ISCSI_SESSION_DEBUG(is, "freezing");
 339                 xpt_freeze_simq(is->is_sim, 1);
 340                 is->is_simq_frozen = true;
 341         }
 342
 343         /*
 344          * Remove postponed PDUs.
 345          */
 346         if (!STAILQ_EMPTY(&is->is_postponed))
 347                 xpt_release_simq(is->is_sim, 1);
 348         while ((pdu = STAILQ_FIRST(&is->is_postponed)) != NULL) {
 349                 STAILQ_REMOVE_HEAD(&is->is_postponed, ip_next);
 350                 icl_pdu_free(pdu);
 351         }
 352
 353         if (destroy_sim == false) {
 354                 /*
 355                  * Terminate SCSI tasks, asking CAM to requeue them.
 356                  */
 357                 iscsi_session_terminate_tasks(is, CAM_REQUEUE_REQ);
 358                 return;
 359         }
 360
 361         iscsi_session_terminate_tasks(is, CAM_DEV_NOT_THERE);
 362
 363         if (is->is_sim == NULL)
 364                 return;
 365
 366         ISCSI_SESSION_DEBUG(is, "deregistering SIM");
 367         xpt_async(AC_LOST_DEVICE, is->is_path, NULL);
 368
 369         if (is->is_simq_frozen) {
 370                 xpt_release_simq(is->is_sim, 1);
 371                 is->is_simq_frozen = false;
 372         }
 373
 374         xpt_free_path(is->is_path);
 375         is->is_path = NULL;
 376         xpt_bus_deregister(cam_sim_path(is->is_sim));
 377         cam_sim_free(is->is_sim, TRUE /*free_devq*/);
 378         is->is_sim = NULL;
 379         is->is_devq = NULL;
 380 }
 381
 382 static void
 383 iscsi_maintenance_thread_reconnect(struct iscsi_session *is)
 384 {
 385
 386         icl_conn_close(is->is_conn);
 387
 388         ISCSI_SESSION_LOCK(is);
 389
 390         is->is_connected = false;
 391         is->is_reconnecting = false;
 392         is->is_login_phase = false;
 393
 394 #ifdef ICL_KERNEL_PROXY
 395         if (is->is_login_pdu != NULL) {
 396                 icl_pdu_free(is->is_login_pdu);
 397                 is->is_login_pdu = NULL;
 398         }
 399         cv_signal(&is->is_login_cv);
 400 #endif
 401
 402         if (fail_on_disconnection) {
 403                 ISCSI_SESSION_DEBUG(is, "connection failed, destroying devices");
 404                 iscsi_session_cleanup(is, true);
 405         } else {
 406                 iscsi_session_cleanup(is, false);
 407         }
 408
 409         KASSERT(TAILQ_EMPTY(&is->is_outstanding),
 410             ("destroying session with active tasks"));
 411         KASSERT(STAILQ_EMPTY(&is->is_postponed),
 412             ("destroying session with postponed PDUs"));
 413
 414         if (is->is_conf.isc_enable == 0 && is->is_conf.isc_discovery == 0) {
 415                 ISCSI_SESSION_UNLOCK(is);
 416                 return;
 417         }
 418
 419         /*
 420          * Request immediate reconnection from iscsid(8).
 421          */
 422         //ISCSI_SESSION_DEBUG(is, "waking up iscsid(8)");
 423         is->is_waiting_for_iscsid = true;
 424         strlcpy(is->is_reason, "Waiting for iscsid(8)", sizeof(is->is_reason));
 425         is->is_timeout = 0;
 426         ISCSI_SESSION_UNLOCK(is);
 427         cv_signal(&is->is_softc->sc_cv);
 428 }
 429
 430 static void
 431 iscsi_maintenance_thread_terminate(struct iscsi_session *is)
 432 {
 433         struct iscsi_softc *sc;
 434
 435         sc = is->is_softc;
 436         sx_xlock(&sc->sc_lock);
 437         TAILQ_REMOVE(&sc->sc_sessions, is, is_next);
 438         sx_xunlock(&sc->sc_lock);
 439
 440         icl_conn_close(is->is_conn);
 441         callout_drain(&is->is_callout);
 442
 443         ISCSI_SESSION_LOCK(is);
 444
 445         KASSERT(is->is_terminating, ("is_terminating == false"));
 446
 447 #ifdef ICL_KERNEL_PROXY
 448         if (is->is_login_pdu != NULL) {
 449                 icl_pdu_free(is->is_login_pdu);
 450                 is->is_login_pdu = NULL;
 451         }
 452         cv_signal(&is->is_login_cv);
 453 #endif
 454
 455         iscsi_session_cleanup(is, true);
 456
 457         KASSERT(TAILQ_EMPTY(&is->is_outstanding),
 458             ("destroying session with active tasks"));
 459         KASSERT(STAILQ_EMPTY(&is->is_postponed),
 460             ("destroying session with postponed PDUs"));
 461
 462         ISCSI_SESSION_UNLOCK(is);
 463
 464         icl_conn_free(is->is_conn);
 465         mtx_destroy(&is->is_lock);
 466         cv_destroy(&is->is_maintenance_cv);
 467 #ifdef ICL_KERNEL_PROXY
 468         cv_destroy(&is->is_login_cv);
 469 #endif
 470
 471         ISCSI_SESSION_DEBUG(is, "terminated");
 472         free(is, M_ISCSI);
 473
 474         /*
 475          * The iscsi_unload() routine might be waiting.
 476          */
 477         cv_signal(&sc->sc_cv);
 478 }
 479
 480 static void
 481 iscsi_maintenance_thread(void *arg)
 482 {
 483         struct iscsi_session *is = arg;
 484
 485         ISCSI_SESSION_LOCK(is);
 486         for (;;) {
 487                 if (is->is_reconnecting == false &&
 488                     is->is_terminating == false &&
 489                     (STAILQ_EMPTY(&is->is_postponed) ||
 490                      ISCSI_SNGT(is->is_cmdsn, is->is_maxcmdsn)))
 491                         cv_wait(&is->is_maintenance_cv, &is->is_lock);
 492
 493                 /* Terminate supersedes reconnect. */
 494                 if (is->is_terminating) {
 495                         ISCSI_SESSION_UNLOCK(is);
 496                         iscsi_maintenance_thread_terminate(is);
 497                         kthread_exit();
 498                         return;
 499                 }
 500
 501                 if (is->is_reconnecting) {
 502                         ISCSI_SESSION_UNLOCK(is);
 503                         iscsi_maintenance_thread_reconnect(is);
 504                         ISCSI_SESSION_LOCK(is);
 505                         continue;
 506                 }
 507
 508                 iscsi_session_send_postponed(is);
 509         }
 510         ISCSI_SESSION_UNLOCK(is);
 511 }
 512
 513 static void
 514 iscsi_session_reconnect(struct iscsi_session *is)
 515 {
 516
 517         /*
 518          * XXX: We can't use locking here, because
 519          *      it's being called from various contexts.
 520          *      Hope it doesn't break anything.
 521          */
 522         if (is->is_reconnecting)
 523                 return;
 524
 525         is->is_reconnecting = true;
 526         cv_signal(&is->is_maintenance_cv);
 527 }
 528
 529 static void
 530 iscsi_session_terminate(struct iscsi_session *is)
 531 {
 532
 533         if (is->is_terminating)
 534                 return;
 535
 536         is->is_terminating = true;
 537
 538 #if 0
 539         iscsi_session_logout(is);
 540 #endif
 541         cv_signal(&is->is_maintenance_cv);
 542 }
 543
 544 static void
 545 iscsi_callout(void *context)
 546 {
 547         struct icl_pdu *request;
 548         struct iscsi_bhs_nop_out *bhsno;
 549         struct iscsi_session *is;
 550         bool reconnect_needed = false;
 551
 552         is = context;
 553
 554         ISCSI_SESSION_LOCK(is);
 555         if (is->is_terminating) {
 556                 ISCSI_SESSION_UNLOCK(is);
 557                 return;
 558         }
 559
 560         callout_schedule(&is->is_callout, 1 * hz);
 561
 562         if (is->is_conf.isc_enable == 0)
 563                 goto out;
 564
 565         is->is_timeout++;
 566
 567         if (is->is_waiting_for_iscsid) {
 568                 if (iscsid_timeout > 0 && is->is_timeout > iscsid_timeout) {
 569                         ISCSI_SESSION_WARN(is, "timed out waiting for iscsid(8) "
 570                             "for %d seconds; reconnecting",
 571                             is->is_timeout);
 572                         reconnect_needed = true;
 573                 }
 574                 goto out;
 575         }
 576
 577         if (is->is_login_phase) {
 578                 if (login_timeout > 0 && is->is_timeout > login_timeout) {
 579                         ISCSI_SESSION_WARN(is, "login timed out after %d seconds; "
 580                             "reconnecting", is->is_timeout);
 581                         reconnect_needed = true;
 582                 }
 583                 goto out;
 584         }
 585
 586         if (ping_timeout <= 0) {
 587                 /*
 588                  * Pings are disabled.  Don't send NOP-Out in this case.
 589                  * Reset the timeout, to avoid triggering reconnection,
 590                  * should the user decide to reenable them.
 591                  */
 592                 is->is_timeout = 0;
 593                 goto out;
 594         }
 595
 596         if (is->is_timeout >= ping_timeout) {
 597                 ISCSI_SESSION_WARN(is, "no ping reply (NOP-In) after %d seconds; "
 598                     "reconnecting", ping_timeout);
 599                 reconnect_needed = true;
 600                 goto out;
 601         }
 602
 603         ISCSI_SESSION_UNLOCK(is);
 604
 605         /*
 606          * If the ping was reset less than one second ago - which means
 607          * that we've received some PDU during the last second - assume
 608          * the traffic flows correctly and don't bother sending a NOP-Out.
 609          *
 610          * (It's 2 - one for one second, and one for incrementing is_timeout
 611          * earlier in this routine.)
 612          */
 613         if (is->is_timeout < 2)
 614                 return;
 615
 616         request = icl_pdu_new(is->is_conn, M_NOWAIT);
 617         if (request == NULL) {
 618                 ISCSI_SESSION_WARN(is, "failed to allocate PDU");
 619                 return;
 620         }
 621         bhsno = (struct iscsi_bhs_nop_out *)request->ip_bhs;
 622         bhsno->bhsno_opcode = ISCSI_BHS_OPCODE_NOP_OUT |
 623             ISCSI_BHS_OPCODE_IMMEDIATE;
 624         bhsno->bhsno_flags = 0x80;
 625         bhsno->bhsno_target_transfer_tag = 0xffffffff;
 626         iscsi_pdu_queue(request);
 627         return;
 628
 629 out:
 630         if (is->is_terminating) {
 631                 ISCSI_SESSION_UNLOCK(is);
 632                 return;
 633         }
 634
 635         ISCSI_SESSION_UNLOCK(is);
 636
 637         if (reconnect_needed)
 638                 iscsi_session_reconnect(is);
 639 }
 640
 641 static void
 642 iscsi_pdu_update_statsn(const struct icl_pdu *response)
 643 {
 644         const struct iscsi_bhs_data_in *bhsdi;
 645         struct iscsi_session *is;
 646         uint32_t expcmdsn, maxcmdsn, statsn;
 647
 648         is = PDU_SESSION(response);
 649
 650         ISCSI_SESSION_LOCK_ASSERT(is);
 651
 652         /*
 653          * We're only using fields common for all the response
 654          * (target -> initiator) PDUs.
 655          */
 656         bhsdi = (const struct iscsi_bhs_data_in *)response->ip_bhs;
 657         /*
 658          * Ok, I lied.  In case of Data-In, "The fields StatSN, Status,
 659          * and Residual Count only have meaningful content if the S bit
 660          * is set to 1", so we also need to check the bit specific for
 661          * Data-In PDU.
 662          */
 663         if (bhsdi->bhsdi_opcode != ISCSI_BHS_OPCODE_SCSI_DATA_IN ||
 664             (bhsdi->bhsdi_flags & BHSDI_FLAGS_S) != 0) {
 665                 statsn = ntohl(bhsdi->bhsdi_statsn);
 666                 if (statsn != is->is_statsn && statsn != (is->is_statsn + 1)) {
 667                         /* XXX: This is normal situation for MCS */
 668                         ISCSI_SESSION_WARN(is, "PDU 0x%x StatSN %u != "
 669                             "session ExpStatSN %u (or + 1); reconnecting",
 670                             bhsdi->bhsdi_opcode, statsn, is->is_statsn);
 671                         iscsi_session_reconnect(is);
 672                 }
 673                 if (ISCSI_SNGT(statsn, is->is_statsn))
 674                         is->is_statsn = statsn;
 675         }
 676
 677         expcmdsn = ntohl(bhsdi->bhsdi_expcmdsn);
 678         maxcmdsn = ntohl(bhsdi->bhsdi_maxcmdsn);
 679
 680         if (ISCSI_SNLT(maxcmdsn + 1, expcmdsn)) {
 681                 ISCSI_SESSION_DEBUG(is,
 682                     "PDU MaxCmdSN %u + 1 < PDU ExpCmdSN %u; ignoring",
 683                     maxcmdsn, expcmdsn);
 684         } else {
 685                 if (ISCSI_SNGT(maxcmdsn, is->is_maxcmdsn)) {
 686                         is->is_maxcmdsn = maxcmdsn;
 687
 688                         /*
 689                          * Command window increased; kick the maintanance thread
 690                          * to send out postponed commands.
 691                          */
 692                         if (!STAILQ_EMPTY(&is->is_postponed))
 693                                 cv_signal(&is->is_maintenance_cv);
 694                 } else if (ISCSI_SNLT(maxcmdsn, is->is_maxcmdsn)) {
 695                         /* XXX: This is normal situation for MCS */
 696                         ISCSI_SESSION_DEBUG(is,
 697                             "PDU MaxCmdSN %u < session MaxCmdSN %u; ignoring",
 698                             maxcmdsn, is->is_maxcmdsn);
 699                 }
 700
 701                 if (ISCSI_SNGT(expcmdsn, is->is_expcmdsn)) {
 702                         is->is_expcmdsn = expcmdsn;
 703                 } else if (ISCSI_SNLT(expcmdsn, is->is_expcmdsn)) {
 704                         /* XXX: This is normal situation for MCS */
 705                         ISCSI_SESSION_DEBUG(is,
 706                             "PDU ExpCmdSN %u < session ExpCmdSN %u; ignoring",
 707                             expcmdsn, is->is_expcmdsn);
 708                 }
 709         }
 710
 711         /*
 712          * Every incoming PDU - not just NOP-In - resets the ping timer.
 713          * The purpose of the timeout is to reset the connection when it stalls;
 714          * we don't want this to happen when NOP-In or NOP-Out ends up delayed
 715          * in some queue.
 716          */
 717         is->is_timeout = 0;
 718 }
 719
 720 static void
 721 iscsi_receive_callback(struct icl_pdu *response)
 722 {
 723         struct iscsi_session *is;
 724
 725         is = PDU_SESSION(response);
 726
 727         ISCSI_SESSION_LOCK(is);
 728
 729         iscsi_pdu_update_statsn(response);
 730
 731 #ifdef ICL_KERNEL_PROXY
 732         if (is->is_login_phase) {
 733                 if (is->is_login_pdu == NULL)
 734                         is->is_login_pdu = response;
 735                 else
 736                         icl_pdu_free(response);
 737                 ISCSI_SESSION_UNLOCK(is);
 738                 cv_signal(&is->is_login_cv);
 739                 return;
 740         }
 741 #endif
 742
 743         /*
 744          * The handling routine is responsible for freeing the PDU
 745          * when it's no longer needed.
 746          */
 747         switch (response->ip_bhs->bhs_opcode) {
 748         case ISCSI_BHS_OPCODE_NOP_IN:
 749                 iscsi_pdu_handle_nop_in(response);
 750                 ISCSI_SESSION_UNLOCK(is);
 751                 break;
 752         case ISCSI_BHS_OPCODE_SCSI_RESPONSE:
 753                 iscsi_pdu_handle_scsi_response(response);
 754                 /* Session lock dropped inside. */
 755                 ISCSI_SESSION_LOCK_ASSERT_NOT(is);
 756                 break;
 757         case ISCSI_BHS_OPCODE_TASK_RESPONSE:
 758                 iscsi_pdu_handle_task_response(response);
 759                 ISCSI_SESSION_UNLOCK(is);
 760                 break;
 761         case ISCSI_BHS_OPCODE_SCSI_DATA_IN:
 762                 iscsi_pdu_handle_data_in(response);
 763                 /* Session lock dropped inside. */
 764                 ISCSI_SESSION_LOCK_ASSERT_NOT(is);
 765                 break;
 766         case ISCSI_BHS_OPCODE_LOGOUT_RESPONSE:
 767                 iscsi_pdu_handle_logout_response(response);
 768                 ISCSI_SESSION_UNLOCK(is);
 769                 break;
 770         case ISCSI_BHS_OPCODE_R2T:
 771                 iscsi_pdu_handle_r2t(response);
 772                 ISCSI_SESSION_UNLOCK(is);
 773                 break;
 774         case ISCSI_BHS_OPCODE_ASYNC_MESSAGE:
 775                 iscsi_pdu_handle_async_message(response);
 776                 ISCSI_SESSION_UNLOCK(is);
 777                 break;
 778         case ISCSI_BHS_OPCODE_REJECT:
 779                 iscsi_pdu_handle_reject(response);
 780                 ISCSI_SESSION_UNLOCK(is);
 781                 break;
 782         default:
 783                 ISCSI_SESSION_WARN(is, "received PDU with unsupported "
 784                     "opcode 0x%x; reconnecting",
 785                     response->ip_bhs->bhs_opcode);
 786                 iscsi_session_reconnect(is);
 787                 ISCSI_SESSION_UNLOCK(is);
 788                 icl_pdu_free(response);
 789         }
 790 }
 791
 792 static void
 793 iscsi_error_callback(struct icl_conn *ic)
 794 {
 795         struct iscsi_session *is;
 796
 797         is = CONN_SESSION(ic);
 798
 799         ISCSI_SESSION_WARN(is, "connection error; reconnecting");
 800         iscsi_session_reconnect(is);
 801 }
 802
 803 static void
 804 iscsi_pdu_handle_nop_in(struct icl_pdu *response)
 805 {
 806         struct iscsi_session *is;
 807         struct iscsi_bhs_nop_out *bhsno;
 808         struct iscsi_bhs_nop_in *bhsni;
 809         struct icl_pdu *request;
 810         void *data = NULL;
 811         size_t datasize;
 812         int error;
 813
 814         is = PDU_SESSION(response);
 815         bhsni = (struct iscsi_bhs_nop_in *)response->ip_bhs;
 816
 817         if (bhsni->bhsni_target_transfer_tag == 0xffffffff) {
 818                 /*
 819                  * Nothing to do; iscsi_pdu_update_statsn() already
 820                  * zeroed the timeout.
 821                  */
 822                 icl_pdu_free(response);
 823                 return;
 824         }
 825
 826         datasize = icl_pdu_data_segment_length(response);
 827         if (datasize > 0) {
 828                 data = malloc(datasize, M_ISCSI, M_NOWAIT | M_ZERO);
 829                 if (data == NULL) {
 830                         ISCSI_SESSION_WARN(is, "failed to allocate memory; "
 831                             "reconnecting");
 832                         icl_pdu_free(response);
 833                         iscsi_session_reconnect(is);
 834                         return;
 835                 }
 836                 icl_pdu_get_data(response, 0, data, datasize);
 837         }
 838
 839         request = icl_pdu_new(response->ip_conn, M_NOWAIT);
 840         if (request == NULL) {
 841                 ISCSI_SESSION_WARN(is, "failed to allocate memory; "
 842                     "reconnecting");
 843                 free(data, M_ISCSI);
 844                 icl_pdu_free(response);
 845                 iscsi_session_reconnect(is);
 846                 return;
 847         }
 848         bhsno = (struct iscsi_bhs_nop_out *)request->ip_bhs;
 849         bhsno->bhsno_opcode = ISCSI_BHS_OPCODE_NOP_OUT |
 850             ISCSI_BHS_OPCODE_IMMEDIATE;
 851         bhsno->bhsno_flags = 0x80;
 852         bhsno->bhsno_initiator_task_tag = 0xffffffff;
 853         bhsno->bhsno_target_transfer_tag = bhsni->bhsni_target_transfer_tag;
 854         if (datasize > 0) {
 855                 error = icl_pdu_append_data(request, data, datasize, M_NOWAIT);
 856                 if (error != 0) {
 857                         ISCSI_SESSION_WARN(is, "failed to allocate memory; "
 858                             "reconnecting");
 859                         free(data, M_ISCSI);
 860                         icl_pdu_free(request);
 861                         icl_pdu_free(response);
 862                         iscsi_session_reconnect(is);
 863                         return;
 864                 }
 865                 free(data, M_ISCSI);
 866         }
 867
 868         icl_pdu_free(response);
 869         iscsi_pdu_queue_locked(request);
 870 }
 871
 872 static void
 873 iscsi_pdu_handle_scsi_response(struct icl_pdu *response)
 874 {
 875         struct iscsi_bhs_scsi_response *bhssr;
 876         struct iscsi_outstanding *io;
 877         struct iscsi_session *is;
 878         union ccb *ccb;
 879         struct ccb_scsiio *csio;
 880         size_t data_segment_len, received;
 881         uint16_t sense_len;
 882         uint32_t resid;
 883
 884         is = PDU_SESSION(response);
 885
 886         bhssr = (struct iscsi_bhs_scsi_response *)response->ip_bhs;
 887         io = iscsi_outstanding_find(is, bhssr->bhssr_initiator_task_tag);
 888         if (io == NULL || io->io_ccb == NULL) {
 889                 ISCSI_SESSION_WARN(is, "bad itt 0x%x", bhssr->bhssr_initiator_task_tag);
 890                 icl_pdu_free(response);
 891                 iscsi_session_reconnect(is);
 892                 ISCSI_SESSION_UNLOCK(is);
 893                 return;
 894         }
 895
 896         ccb = io->io_ccb;
 897
 898         /*
 899          * With iSER, after getting good response we can be sure
 900          * that all the data has been successfully transferred.
 901          */
 902         if (is->is_conn->ic_iser) {
 903                 resid = ntohl(bhssr->bhssr_residual_count);
 904                 if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_UNDERFLOW) {
 905                         io->io_received = ccb->csio.dxfer_len - resid;
 906                 } else if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_OVERFLOW) {
 907                         ISCSI_SESSION_WARN(is, "overflow: target indicates %d", resid);
 908                 } else {
 909                         io->io_received = ccb->csio.dxfer_len;
 910                 }
 911         }
 912
 913         received = io->io_received;
 914         iscsi_outstanding_remove(is, io);
 915         ISCSI_SESSION_UNLOCK(is);
 916
 917         if (bhssr->bhssr_response != BHSSR_RESPONSE_COMMAND_COMPLETED) {
 918                 ISCSI_SESSION_WARN(is, "service response 0x%x", bhssr->bhssr_response);
 919                 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
 920                         xpt_freeze_devq(ccb->ccb_h.path, 1);
 921                         ISCSI_SESSION_DEBUG(is, "freezing devq");
 922                 }
 923                 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN;
 924         } else if (bhssr->bhssr_status == 0) {
 925                 ccb->ccb_h.status = CAM_REQ_CMP;
 926         } else {
 927                 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
 928                         xpt_freeze_devq(ccb->ccb_h.path, 1);
 929                         ISCSI_SESSION_DEBUG(is, "freezing devq");
 930                 }
 931                 ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR | CAM_DEV_QFRZN;
 932                 ccb->csio.scsi_status = bhssr->bhssr_status;
 933         }
 934
 935         csio = &ccb->csio;
 936         data_segment_len = icl_pdu_data_segment_length(response);
 937         if (data_segment_len > 0) {
 938                 if (data_segment_len < sizeof(sense_len)) {
 939                         ISCSI_SESSION_WARN(is, "truncated data segment (%zd bytes)",
 940                             data_segment_len);
 941                         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
 942                                 xpt_freeze_devq(ccb->ccb_h.path, 1);
 943                                 ISCSI_SESSION_DEBUG(is, "freezing devq");
 944                         }
 945                         ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN;
 946                         goto out;
 947                 }
 948                 icl_pdu_get_data(response, 0, &sense_len, sizeof(sense_len));
 949                 sense_len = ntohs(sense_len);
 950 #if 0
 951                 ISCSI_SESSION_DEBUG(is, "sense_len %d, data len %zd",
 952                     sense_len, data_segment_len);
 953 #endif
 954                 if (sizeof(sense_len) + sense_len > data_segment_len) {
 955                         ISCSI_SESSION_WARN(is, "truncated data segment "
 956                             "(%zd bytes, should be %zd)",
 957                             data_segment_len, sizeof(sense_len) + sense_len);
 958                         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
 959                                 xpt_freeze_devq(ccb->ccb_h.path, 1);
 960                                 ISCSI_SESSION_DEBUG(is, "freezing devq");
 961                         }
 962                         ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN;
 963                         goto out;
 964                 } else if (sizeof(sense_len) + sense_len < data_segment_len)
 965                         ISCSI_SESSION_WARN(is, "oversize data segment "
 966                             "(%zd bytes, should be %zd)",
 967                             data_segment_len, sizeof(sense_len) + sense_len);
 968                 if (sense_len > csio->sense_len) {
 969                         ISCSI_SESSION_DEBUG(is, "truncating sense from %d to %d",
 970                             sense_len, csio->sense_len);
 971                         sense_len = csio->sense_len;
 972                 }
 973                 icl_pdu_get_data(response, sizeof(sense_len), &csio->sense_data, sense_len);
 974                 csio->sense_resid = csio->sense_len - sense_len;
 975                 ccb->ccb_h.status |= CAM_AUTOSNS_VALID;
 976         }
 977
 978 out:
 979         if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_UNDERFLOW)
 980                 csio->resid = ntohl(bhssr->bhssr_residual_count);
 981
 982         if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) {
 983                 KASSERT(received <= csio->dxfer_len,
 984                     ("received > csio->dxfer_len"));
 985                 if (received < csio->dxfer_len) {
 986                         if (csio->resid != csio->dxfer_len - received) {
 987                                 ISCSI_SESSION_WARN(is, "underflow mismatch: "
 988                                     "target indicates %d, we calculated %zd",
 989                                     csio->resid, csio->dxfer_len - received);
 990                         }
 991                         csio->resid = csio->dxfer_len - received;
 992                 }
 993         }
 994
 995         xpt_done(ccb);
 996         icl_pdu_free(response);
 997 }
 998
 999 static void
1000 iscsi_pdu_handle_task_response(struct icl_pdu *response)
1001 {
1002         struct iscsi_bhs_task_management_response *bhstmr;
1003         struct iscsi_outstanding *io, *aio;
1004         struct iscsi_session *is;
1005
1006         is = PDU_SESSION(response);
1007
1008         bhstmr = (struct iscsi_bhs_task_management_response *)response->ip_bhs;
1009         io = iscsi_outstanding_find(is, bhstmr->bhstmr_initiator_task_tag);
1010         if (io == NULL || io->io_ccb != NULL) {
1011                 ISCSI_SESSION_WARN(is, "bad itt 0x%x",
1012                     bhstmr->bhstmr_initiator_task_tag);
1013                 icl_pdu_free(response);
1014                 iscsi_session_reconnect(is);
1015                 return;
1016         }
1017
1018         if (bhstmr->bhstmr_response != BHSTMR_RESPONSE_FUNCTION_COMPLETE) {
1019                 ISCSI_SESSION_WARN(is, "task response 0x%x",
1020                     bhstmr->bhstmr_response);
1021         } else {
1022                 aio = iscsi_outstanding_find(is, io->io_datasn);
1023                 if (aio != NULL && aio->io_ccb != NULL)
1024                         iscsi_session_terminate_task(is, aio, CAM_REQ_ABORTED);
1025         }
1026
1027         iscsi_outstanding_remove(is, io);
1028         icl_pdu_free(response);
1029 }
1030
1031 static void
1032 iscsi_pdu_handle_data_in(struct icl_pdu *response)
1033 {
1034         struct iscsi_bhs_data_in *bhsdi;
1035         struct iscsi_outstanding *io;
1036         struct iscsi_session *is;
1037         union ccb *ccb;
1038         struct ccb_scsiio *csio;
1039         size_t data_segment_len, received, oreceived;
1040
1041         is = PDU_SESSION(response);
1042         bhsdi = (struct iscsi_bhs_data_in *)response->ip_bhs;
1043         io = iscsi_outstanding_find(is, bhsdi->bhsdi_initiator_task_tag);
1044         if (io == NULL || io->io_ccb == NULL) {
1045                 ISCSI_SESSION_WARN(is, "bad itt 0x%x", bhsdi->bhsdi_initiator_task_tag);
1046                 icl_pdu_free(response);
1047                 iscsi_session_reconnect(is);
1048                 ISCSI_SESSION_UNLOCK(is);
1049                 return;
1050         }
1051
1052         data_segment_len = icl_pdu_data_segment_length(response);
1053         if (data_segment_len == 0) {
1054                 /*
1055                  * "The sending of 0 length data segments should be avoided,
1056                  * but initiators and targets MUST be able to properly receive
1057                  * 0 length data segments."
1058                  */
1059                 ISCSI_SESSION_UNLOCK(is);
1060                 icl_pdu_free(response);
1061                 return;
1062         }
1063
1064         /*
1065          * We need to track this for security reasons - without it, malicious target
1066          * could respond to SCSI READ without sending Data-In PDUs, which would result
1067          * in read operation on the initiator side returning random kernel data.
1068          */
1069         if (ntohl(bhsdi->bhsdi_buffer_offset) != io->io_received) {
1070                 ISCSI_SESSION_WARN(is, "data out of order; expected offset %zd, got %zd",
1071                     io->io_received, (size_t)ntohl(bhsdi->bhsdi_buffer_offset));
1072                 icl_pdu_free(response);
1073                 iscsi_session_reconnect(is);
1074                 ISCSI_SESSION_UNLOCK(is);
1075                 return;
1076         }
1077
1078         ccb = io->io_ccb;
1079         csio = &ccb->csio;
1080
1081         if (io->io_received + data_segment_len > csio->dxfer_len) {
1082                 ISCSI_SESSION_WARN(is, "oversize data segment (%zd bytes "
1083                     "at offset %zd, buffer is %d)",
1084                     data_segment_len, io->io_received, csio->dxfer_len);
1085                 icl_pdu_free(response);
1086                 iscsi_session_reconnect(is);
1087                 ISCSI_SESSION_UNLOCK(is);
1088                 return;
1089         }
1090
1091         oreceived = io->io_received;
1092         io->io_received += data_segment_len;
1093         received = io->io_received;
1094         if ((bhsdi->bhsdi_flags & BHSDI_FLAGS_S) != 0)
1095                 iscsi_outstanding_remove(is, io);
1096         ISCSI_SESSION_UNLOCK(is);
1097
1098         icl_pdu_get_data(response, 0, csio->data_ptr + oreceived, data_segment_len);
1099
1100         /*
1101          * XXX: Check DataSN.
1102          * XXX: Check F.
1103          */
1104         if ((bhsdi->bhsdi_flags & BHSDI_FLAGS_S) == 0) {
1105                 /*
1106                  * Nothing more to do.
1107                  */
1108                 icl_pdu_free(response);
1109                 return;
1110         }
1111
1112         //ISCSI_SESSION_DEBUG(is, "got S flag; status 0x%x", bhsdi->bhsdi_status);
1113         if (bhsdi->bhsdi_status == 0) {
1114                 ccb->ccb_h.status = CAM_REQ_CMP;
1115         } else {
1116                 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
1117                         xpt_freeze_devq(ccb->ccb_h.path, 1);
1118                         ISCSI_SESSION_DEBUG(is, "freezing devq");
1119                 }
1120                 ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR | CAM_DEV_QFRZN;
1121                 csio->scsi_status = bhsdi->bhsdi_status;
1122         }
1123
1124         if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) {
1125                 KASSERT(received <= csio->dxfer_len,
1126                     ("received > csio->dxfer_len"));
1127                 if (received < csio->dxfer_len) {
1128                         csio->resid = ntohl(bhsdi->bhsdi_residual_count);
1129                         if (csio->resid != csio->dxfer_len - received) {
1130                                 ISCSI_SESSION_WARN(is, "underflow mismatch: "
1131                                     "target indicates %d, we calculated %zd",
1132                                     csio->resid, csio->dxfer_len - received);
1133                         }
1134                         csio->resid = csio->dxfer_len - received;
1135                 }
1136         }
1137
1138         xpt_done(ccb);
1139         icl_pdu_free(response);
1140 }
1141
1142 static void
1143 iscsi_pdu_handle_logout_response(struct icl_pdu *response)
1144 {
1145
1146         ISCSI_SESSION_DEBUG(PDU_SESSION(response), "logout response");
1147         icl_pdu_free(response);
1148 }
1149
1150 static void
1151 iscsi_pdu_handle_r2t(struct icl_pdu *response)
1152 {
1153         struct icl_pdu *request;
1154         struct iscsi_session *is;
1155         struct iscsi_bhs_r2t *bhsr2t;
1156         struct iscsi_bhs_data_out *bhsdo;
1157         struct iscsi_outstanding *io;
1158         struct ccb_scsiio *csio;
1159         size_t off, len, total_len;
1160         int error;
1161
1162         is = PDU_SESSION(response);
1163
1164         bhsr2t = (struct iscsi_bhs_r2t *)response->ip_bhs;
1165         io = iscsi_outstanding_find(is, bhsr2t->bhsr2t_initiator_task_tag);
1166         if (io == NULL || io->io_ccb == NULL) {
1167                 ISCSI_SESSION_WARN(is, "bad itt 0x%x; reconnecting",
1168                     bhsr2t->bhsr2t_initiator_task_tag);
1169                 icl_pdu_free(response);
1170                 iscsi_session_reconnect(is);
1171                 return;
1172         }
1173
1174         csio = &io->io_ccb->csio;
1175
1176         if ((csio->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_OUT) {
1177                 ISCSI_SESSION_WARN(is, "received R2T for read command; reconnecting");
1178                 icl_pdu_free(response);
1179                 iscsi_session_reconnect(is);
1180                 return;
1181         }
1182
1183         /*
1184          * XXX: Verify R2TSN.
1185          */
1186
1187         io->io_datasn = 0;
1188
1189         off = ntohl(bhsr2t->bhsr2t_buffer_offset);
1190         if (off > csio->dxfer_len) {
1191                 ISCSI_SESSION_WARN(is, "target requested invalid offset "
1192                     "%zd, buffer is is %d; reconnecting", off, csio->dxfer_len);
1193                 icl_pdu_free(response);
1194                 iscsi_session_reconnect(is);
1195                 return;
1196         }
1197
1198         total_len = ntohl(bhsr2t->bhsr2t_desired_data_transfer_length);
1199         if (total_len == 0 || total_len > csio->dxfer_len) {
1200                 ISCSI_SESSION_WARN(is, "target requested invalid length "
1201                     "%zd, buffer is %d; reconnecting", total_len, csio->dxfer_len);
1202                 icl_pdu_free(response);
1203                 iscsi_session_reconnect(is);
1204                 return;
1205         }
1206
1207         //ISCSI_SESSION_DEBUG(is, "r2t; off %zd, len %zd", off, total_len);
1208
1209         for (;;) {
1210                 len = total_len;
1211
1212                 if (len > is->is_max_send_data_segment_length)
1213                         len = is->is_max_send_data_segment_length;
1214
1215                 if (off + len > csio->dxfer_len) {
1216                         ISCSI_SESSION_WARN(is, "target requested invalid "
1217                             "length/offset %zd, buffer is %d; reconnecting",
1218                             off + len, csio->dxfer_len);
1219                         icl_pdu_free(response);
1220                         iscsi_session_reconnect(is);
1221                         return;
1222                 }
1223
1224                 request = icl_pdu_new(response->ip_conn, M_NOWAIT);
1225                 if (request == NULL) {
1226                         icl_pdu_free(response);
1227                         iscsi_session_reconnect(is);
1228                         return;
1229                 }
1230
1231                 bhsdo = (struct iscsi_bhs_data_out *)request->ip_bhs;
1232                 bhsdo->bhsdo_opcode = ISCSI_BHS_OPCODE_SCSI_DATA_OUT;
1233                 bhsdo->bhsdo_lun = bhsr2t->bhsr2t_lun;
1234                 bhsdo->bhsdo_initiator_task_tag =
1235                     bhsr2t->bhsr2t_initiator_task_tag;
1236                 bhsdo->bhsdo_target_transfer_tag =
1237                     bhsr2t->bhsr2t_target_transfer_tag;
1238                 bhsdo->bhsdo_datasn = htonl(io->io_datasn++);
1239                 bhsdo->bhsdo_buffer_offset = htonl(off);
1240                 error = icl_pdu_append_data(request, csio->data_ptr + off, len,
1241                     M_NOWAIT);
1242                 if (error != 0) {
1243                         ISCSI_SESSION_WARN(is, "failed to allocate memory; "
1244                             "reconnecting");
1245                         icl_pdu_free(request);
1246                         icl_pdu_free(response);
1247                         iscsi_session_reconnect(is);
1248                         return;
1249                 }
1250
1251                 off += len;
1252                 total_len -= len;
1253
1254                 if (total_len == 0) {
1255                         bhsdo->bhsdo_flags |= BHSDO_FLAGS_F;
1256                         //ISCSI_SESSION_DEBUG(is, "setting F, off %zd", off);
1257                 } else {
1258                         //ISCSI_SESSION_DEBUG(is, "not finished, off %zd", off);
1259                 }
1260
1261                 iscsi_pdu_queue_locked(request);
1262
1263                 if (total_len == 0)
1264                         break;
1265         }
1266
1267         icl_pdu_free(response);
1268 }
1269
1270 static void
1271 iscsi_pdu_handle_async_message(struct icl_pdu *response)
1272 {
1273         struct iscsi_bhs_asynchronous_message *bhsam;
1274         struct iscsi_session *is;
1275
1276         is = PDU_SESSION(response);
1277         bhsam = (struct iscsi_bhs_asynchronous_message *)response->ip_bhs;
1278         switch (bhsam->bhsam_async_event) {
1279         case BHSAM_EVENT_TARGET_REQUESTS_LOGOUT:
1280                 ISCSI_SESSION_WARN(is, "target requests logout; removing session");
1281                 iscsi_session_logout(is);
1282                 iscsi_session_terminate(is);
1283                 break;
1284         case BHSAM_EVENT_TARGET_TERMINATES_CONNECTION:
1285                 ISCSI_SESSION_WARN(is, "target indicates it will drop the connection");
1286                 break;
1287         case BHSAM_EVENT_TARGET_TERMINATES_SESSION:
1288                 ISCSI_SESSION_WARN(is, "target indicates it will drop the session");
1289                 break;
1290         default:
1291                 /*
1292                  * XXX: Technically, we're obligated to also handle
1293                  *      parameter renegotiation.
1294                  */
1295                 ISCSI_SESSION_WARN(is, "ignoring AsyncEvent %d", bhsam->bhsam_async_event);
1296                 break;
1297         }
1298
1299         icl_pdu_free(response);
1300 }
1301
1302 static void
1303 iscsi_pdu_handle_reject(struct icl_pdu *response)
1304 {
1305         struct iscsi_bhs_reject *bhsr;
1306         struct iscsi_session *is;
1307
1308         is = PDU_SESSION(response);
1309         bhsr = (struct iscsi_bhs_reject *)response->ip_bhs;
1310         ISCSI_SESSION_WARN(is, "received Reject PDU, reason 0x%x; protocol error?",
1311             bhsr->bhsr_reason);
1312
1313         icl_pdu_free(response);
1314 }
1315
1316 static int
1317 iscsi_ioctl_daemon_wait(struct iscsi_softc *sc,
1318     struct iscsi_daemon_request *request)
1319 {
1320         struct iscsi_session *is;
1321         struct icl_drv_limits idl;
1322         int error;
1323
1324         sx_slock(&sc->sc_lock);
1325         for (;;) {
1326                 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1327                         ISCSI_SESSION_LOCK(is);
1328                         if (is->is_conf.isc_enable == 0 &&
1329                             is->is_conf.isc_discovery == 0) {
1330                                 ISCSI_SESSION_UNLOCK(is);
1331                                 continue;
1332                         }
1333                         if (is->is_waiting_for_iscsid)
1334                                 break;
1335                         ISCSI_SESSION_UNLOCK(is);
1336                 }
1337
1338                 if (is == NULL) {
1339                         /*
1340                          * No session requires attention from iscsid(8); wait.
1341                          */
1342                         error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock);
1343                         if (error != 0) {
1344                                 sx_sunlock(&sc->sc_lock);
1345                                 return (error);
1346                         }
1347                         continue;
1348                 }
1349
1350                 is->is_waiting_for_iscsid = false;
1351                 is->is_login_phase = true;
1352                 is->is_reason[0] = '\0';
1353                 ISCSI_SESSION_UNLOCK(is);
1354
1355                 request->idr_session_id = is->is_id;
1356                 memcpy(&request->idr_isid, &is->is_isid,
1357                     sizeof(request->idr_isid));
1358                 request->idr_tsih = 0;  /* New or reinstated session. */
1359                 memcpy(&request->idr_conf, &is->is_conf,
1360                     sizeof(request->idr_conf));
1361
1362                 error = icl_limits(is->is_conf.isc_offload,
1363                     is->is_conf.isc_iser, &idl);
1364                 if (error != 0) {
1365                         ISCSI_SESSION_WARN(is, "icl_limits for offload \"%s\" "
1366                             "failed with error %d", is->is_conf.isc_offload,
1367                             error);
1368                         sx_sunlock(&sc->sc_lock);
1369                         return (error);
1370                 }
1371                 request->idr_limits.isl_max_recv_data_segment_length =
1372                     idl.idl_max_recv_data_segment_length;
1373                 request->idr_limits.isl_max_send_data_segment_length =
1374                     idl.idl_max_send_data_segment_length;
1375                 request->idr_limits.isl_max_burst_length =
1376                     idl.idl_max_burst_length;
1377                 request->idr_limits.isl_first_burst_length =
1378                     idl.idl_first_burst_length;
1379
1380                 sx_sunlock(&sc->sc_lock);
1381                 return (0);
1382         }
1383 }
1384
1385 static int
1386 iscsi_ioctl_daemon_handoff(struct iscsi_softc *sc,
1387     struct iscsi_daemon_handoff *handoff)
1388 {
1389         struct iscsi_session *is;
1390         struct icl_conn *ic;
1391         int error;
1392
1393         sx_slock(&sc->sc_lock);
1394
1395         /*
1396          * Find the session to hand off socket to.
1397          */
1398         TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1399                 if (is->is_id == handoff->idh_session_id)
1400                         break;
1401         }
1402         if (is == NULL) {
1403                 sx_sunlock(&sc->sc_lock);
1404                 return (ESRCH);
1405         }
1406         ISCSI_SESSION_LOCK(is);
1407         ic = is->is_conn;
1408         if (is->is_conf.isc_discovery || is->is_terminating) {
1409                 ISCSI_SESSION_UNLOCK(is);
1410                 sx_sunlock(&sc->sc_lock);
1411                 return (EINVAL);
1412         }
1413         if (is->is_connected) {
1414                 /*
1415                  * This might have happened because another iscsid(8)
1416                  * instance handed off the connection in the meantime.
1417                  * Just return.
1418                  */
1419                 ISCSI_SESSION_WARN(is, "handoff on already connected "
1420                     "session");
1421                 ISCSI_SESSION_UNLOCK(is);
1422                 sx_sunlock(&sc->sc_lock);
1423                 return (EBUSY);
1424         }
1425
1426         strlcpy(is->is_target_alias, handoff->idh_target_alias,
1427             sizeof(is->is_target_alias));
1428         is->is_tsih = handoff->idh_tsih;
1429         is->is_statsn = handoff->idh_statsn;
1430         is->is_initial_r2t = handoff->idh_initial_r2t;
1431         is->is_immediate_data = handoff->idh_immediate_data;
1432
1433         is->is_max_recv_data_segment_length =
1434             handoff->idh_max_recv_data_segment_length;
1435         is->is_max_send_data_segment_length =
1436             handoff->idh_max_send_data_segment_length;
1437         is->is_max_burst_length = handoff->idh_max_burst_length;
1438         is->is_first_burst_length = handoff->idh_first_burst_length;
1439
1440         if (handoff->idh_header_digest == ISCSI_DIGEST_CRC32C)
1441                 ic->ic_header_crc32c = true;
1442         else
1443                 ic->ic_header_crc32c = false;
1444         if (handoff->idh_data_digest == ISCSI_DIGEST_CRC32C)
1445                 ic->ic_data_crc32c = true;
1446         else
1447                 ic->ic_data_crc32c = false;
1448         ic->ic_maxtags = maxtags;
1449
1450         is->is_cmdsn = 0;
1451         is->is_expcmdsn = 0;
1452         is->is_maxcmdsn = 0;
1453         is->is_waiting_for_iscsid = false;
1454         is->is_login_phase = false;
1455         is->is_timeout = 0;
1456         is->is_connected = true;
1457         is->is_reason[0] = '\0';
1458
1459         ISCSI_SESSION_UNLOCK(is);
1460
1461         /*
1462          * If we're going through the proxy, the idh_socket will be 0,
1463          * and the ICL module can simply ignore this call.  It can also
1464          * use it to determine it's no longer in the Login phase.
1465          */
1466         error = icl_conn_handoff(ic, handoff->idh_socket);
1467         if (error != 0) {
1468                 sx_sunlock(&sc->sc_lock);
1469                 iscsi_session_terminate(is);
1470                 return (error);
1471         }
1472
1473         sx_sunlock(&sc->sc_lock);
1474
1475         if (is->is_sim != NULL) {
1476                 /*
1477                  * When reconnecting, there already is SIM allocated for the session.
1478                  */
1479                 KASSERT(is->is_simq_frozen, ("reconnect without frozen simq"));
1480                 ISCSI_SESSION_LOCK(is);
1481                 ISCSI_SESSION_DEBUG(is, "releasing");
1482                 xpt_release_simq(is->is_sim, 1);
1483                 is->is_simq_frozen = false;
1484                 ISCSI_SESSION_UNLOCK(is);
1485
1486         } else {
1487                 ISCSI_SESSION_LOCK(is);
1488                 is->is_devq = cam_simq_alloc(ic->ic_maxtags);
1489                 if (is->is_devq == NULL) {
1490                         ISCSI_SESSION_WARN(is, "failed to allocate simq");
1491                         iscsi_session_terminate(is);
1492                         return (ENOMEM);
1493                 }
1494
1495                 is->is_sim = cam_sim_alloc(iscsi_action, iscsi_poll, "iscsi",
1496                     is, is->is_id /* unit */, &is->is_lock,
1497                     1, ic->ic_maxtags, is->is_devq);
1498                 if (is->is_sim == NULL) {
1499                         ISCSI_SESSION_UNLOCK(is);
1500                         ISCSI_SESSION_WARN(is, "failed to allocate SIM");
1501                         cam_simq_free(is->is_devq);
1502                         iscsi_session_terminate(is);
1503                         return (ENOMEM);
1504                 }
1505
1506                 error = xpt_bus_register(is->is_sim, NULL, 0);
1507                 if (error != 0) {
1508                         ISCSI_SESSION_UNLOCK(is);
1509                         ISCSI_SESSION_WARN(is, "failed to register bus");
1510                         iscsi_session_terminate(is);
1511                         return (ENOMEM);
1512                 }
1513
1514                 error = xpt_create_path(&is->is_path, /*periph*/NULL,
1515                     cam_sim_path(is->is_sim), CAM_TARGET_WILDCARD,
1516                     CAM_LUN_WILDCARD);
1517                 if (error != CAM_REQ_CMP) {
1518                         ISCSI_SESSION_UNLOCK(is);
1519                         ISCSI_SESSION_WARN(is, "failed to create path");
1520                         iscsi_session_terminate(is);
1521                         return (ENOMEM);
1522                 }
1523                 ISCSI_SESSION_UNLOCK(is);
1524         }
1525
1526         return (0);
1527 }
1528
1529 static int
1530 iscsi_ioctl_daemon_fail(struct iscsi_softc *sc,
1531     struct iscsi_daemon_fail *fail)
1532 {
1533         struct iscsi_session *is;
1534
1535         sx_slock(&sc->sc_lock);
1536
1537         TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1538                 if (is->is_id == fail->idf_session_id)
1539                         break;
1540         }
1541         if (is == NULL) {
1542                 sx_sunlock(&sc->sc_lock);
1543                 return (ESRCH);
1544         }
1545         ISCSI_SESSION_LOCK(is);
1546         ISCSI_SESSION_DEBUG(is, "iscsid(8) failed: %s",
1547             fail->idf_reason);
1548         strlcpy(is->is_reason, fail->idf_reason, sizeof(is->is_reason));
1549         //is->is_waiting_for_iscsid = false;
1550         //is->is_login_phase = true;
1551         //iscsi_session_reconnect(is);
1552         ISCSI_SESSION_UNLOCK(is);
1553         sx_sunlock(&sc->sc_lock);
1554
1555         return (0);
1556 }
1557
1558 #ifdef ICL_KERNEL_PROXY
1559 static int
1560 iscsi_ioctl_daemon_connect(struct iscsi_softc *sc,
1561     struct iscsi_daemon_connect *idc)
1562 {
1563         struct iscsi_session *is;
1564         struct sockaddr *from_sa, *to_sa;
1565         int error;
1566
1567         sx_slock(&sc->sc_lock);
1568         TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1569                 if (is->is_id == idc->idc_session_id)
1570                         break;
1571         }
1572         if (is == NULL) {
1573                 sx_sunlock(&sc->sc_lock);
1574                 return (ESRCH);
1575         }
1576         sx_sunlock(&sc->sc_lock);
1577
1578         if (idc->idc_from_addrlen > 0) {
1579                 error = getsockaddr(&from_sa, (void *)idc->idc_from_addr, idc->idc_from_addrlen);
1580                 if (error != 0) {
1581                         ISCSI_SESSION_WARN(is,
1582                             "getsockaddr failed with error %d", error);
1583                         return (error);
1584                 }
1585         } else {
1586                 from_sa = NULL;
1587         }
1588         error = getsockaddr(&to_sa, (void *)idc->idc_to_addr, idc->idc_to_addrlen);
1589         if (error != 0) {
1590                 ISCSI_SESSION_WARN(is, "getsockaddr failed with error %d",
1591                     error);
1592                 free(from_sa, M_SONAME);
1593                 return (error);
1594         }
1595
1596         ISCSI_SESSION_LOCK(is);
1597         is->is_statsn = 0;
1598         is->is_cmdsn = 0;
1599         is->is_expcmdsn = 0;
1600         is->is_maxcmdsn = 0;
1601         is->is_waiting_for_iscsid = false;
1602         is->is_login_phase = true;
1603         is->is_timeout = 0;
1604         ISCSI_SESSION_UNLOCK(is);
1605
1606         error = icl_conn_connect(is->is_conn, idc->idc_domain,
1607             idc->idc_socktype, idc->idc_protocol, from_sa, to_sa);
1608         free(from_sa, M_SONAME);
1609         free(to_sa, M_SONAME);
1610
1611         /*
1612          * Digests are always disabled during login phase.
1613          */
1614         is->is_conn->ic_header_crc32c = false;
1615         is->is_conn->ic_data_crc32c = false;
1616
1617         return (error);
1618 }
1619
1620 static int
1621 iscsi_ioctl_daemon_send(struct iscsi_softc *sc,
1622     struct iscsi_daemon_send *ids)
1623 {
1624         struct iscsi_session *is;
1625         struct icl_pdu *ip;
1626         size_t datalen;
1627         void *data;
1628         int error;
1629
1630         sx_slock(&sc->sc_lock);
1631         TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1632                 if (is->is_id == ids->ids_session_id)
1633                         break;
1634         }
1635         if (is == NULL) {
1636                 sx_sunlock(&sc->sc_lock);
1637                 return (ESRCH);
1638         }
1639         sx_sunlock(&sc->sc_lock);
1640
1641         if (is->is_login_phase == false)
1642                 return (EBUSY);
1643
1644         if (is->is_terminating || is->is_reconnecting)
1645                 return (EIO);
1646
1647         datalen = ids->ids_data_segment_len;
1648         if (datalen > is->is_max_send_data_segment_length)
1649                 return (EINVAL);
1650         if (datalen > 0) {
1651                 data = malloc(datalen, M_ISCSI, M_WAITOK);
1652                 error = copyin(ids->ids_data_segment, data, datalen);
1653                 if (error != 0) {
1654                         free(data, M_ISCSI);
1655                         return (error);
1656                 }
1657         }
1658
1659         ip = icl_pdu_new(is->is_conn, M_WAITOK);
1660         memcpy(ip->ip_bhs, ids->ids_bhs, sizeof(*ip->ip_bhs));
1661         if (datalen > 0) {
1662                 error = icl_pdu_append_data(ip, data, datalen, M_WAITOK);
1663                 KASSERT(error == 0, ("icl_pdu_append_data(..., M_WAITOK) failed"));
1664                 free(data, M_ISCSI);
1665         }
1666         iscsi_pdu_queue(ip);
1667
1668         return (0);
1669 }
1670
1671 static int
1672 iscsi_ioctl_daemon_receive(struct iscsi_softc *sc,
1673     struct iscsi_daemon_receive *idr)
1674 {
1675         struct iscsi_session *is;
1676         struct icl_pdu *ip;
1677         void *data;
1678         int error;
1679
1680         sx_slock(&sc->sc_lock);
1681         TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1682                 if (is->is_id == idr->idr_session_id)
1683                         break;
1684         }
1685         if (is == NULL) {
1686                 sx_sunlock(&sc->sc_lock);
1687                 return (ESRCH);
1688         }
1689         sx_sunlock(&sc->sc_lock);
1690
1691         if (is->is_login_phase == false)
1692                 return (EBUSY);
1693
1694         ISCSI_SESSION_LOCK(is);
1695         while (is->is_login_pdu == NULL &&
1696             is->is_terminating == false &&
1697             is->is_reconnecting == false) {
1698                 error = cv_wait_sig(&is->is_login_cv, &is->is_lock);
1699                 if (error != 0) {
1700                         ISCSI_SESSION_UNLOCK(is);
1701                         return (error);
1702                 }
1703         }
1704         if (is->is_terminating || is->is_reconnecting) {
1705                 ISCSI_SESSION_UNLOCK(is);
1706                 return (EIO);
1707         }
1708         ip = is->is_login_pdu;
1709         is->is_login_pdu = NULL;
1710         ISCSI_SESSION_UNLOCK(is);
1711
1712         if (ip->ip_data_len > idr->idr_data_segment_len) {
1713                 icl_pdu_free(ip);
1714                 return (EMSGSIZE);
1715         }
1716
1717         copyout(ip->ip_bhs, idr->idr_bhs, sizeof(*ip->ip_bhs));
1718         if (ip->ip_data_len > 0) {
1719                 data = malloc(ip->ip_data_len, M_ISCSI, M_WAITOK);
1720                 icl_pdu_get_data(ip, 0, data, ip->ip_data_len);
1721                 copyout(data, idr->idr_data_segment, ip->ip_data_len);
1722                 free(data, M_ISCSI);
1723         }
1724
1725         icl_pdu_free(ip);
1726
1727         return (0);
1728 }
1729 #endif /* ICL_KERNEL_PROXY */
1730
1731 static void
1732 iscsi_sanitize_session_conf(struct iscsi_session_conf *isc)
1733 {
1734         /*
1735          * Just make sure all the fields are null-terminated.
1736          *
1737          * XXX: This is not particularly secure.  We should
1738          *      create our own conf and then copy in relevant
1739          *      fields.
1740          */
1741         isc->isc_initiator[ISCSI_NAME_LEN - 1] = '\0';
1742         isc->isc_initiator_addr[ISCSI_ADDR_LEN - 1] = '\0';
1743         isc->isc_initiator_alias[ISCSI_ALIAS_LEN - 1] = '\0';
1744         isc->isc_target[ISCSI_NAME_LEN - 1] = '\0';
1745         isc->isc_target_addr[ISCSI_ADDR_LEN - 1] = '\0';
1746         isc->isc_user[ISCSI_NAME_LEN - 1] = '\0';
1747         isc->isc_secret[ISCSI_SECRET_LEN - 1] = '\0';
1748         isc->isc_mutual_user[ISCSI_NAME_LEN - 1] = '\0';
1749         isc->isc_mutual_secret[ISCSI_SECRET_LEN - 1] = '\0';
1750 }
1751
1752 static bool
1753 iscsi_valid_session_conf(const struct iscsi_session_conf *isc)
1754 {
1755
1756         if (isc->isc_initiator[0] == '\0') {
1757                 ISCSI_DEBUG("empty isc_initiator");
1758                 return (false);
1759         }
1760
1761         if (isc->isc_target_addr[0] == '\0') {
1762                 ISCSI_DEBUG("empty isc_target_addr");
1763                 return (false);
1764         }
1765
1766         if (isc->isc_discovery != 0 && isc->isc_target[0] != 0) {
1767                 ISCSI_DEBUG("non-empty isc_target for discovery session");
1768                 return (false);
1769         }
1770
1771         if (isc->isc_discovery == 0 && isc->isc_target[0] == 0) {
1772                 ISCSI_DEBUG("empty isc_target for non-discovery session");
1773                 return (false);
1774         }
1775
1776         return (true);
1777 }
1778
1779 static int
1780 iscsi_ioctl_session_add(struct iscsi_softc *sc, struct iscsi_session_add *isa)
1781 {
1782         struct iscsi_session *is;
1783         const struct iscsi_session *is2;
1784         int error;
1785
1786         iscsi_sanitize_session_conf(&isa->isa_conf);
1787         if (iscsi_valid_session_conf(&isa->isa_conf) == false)
1788                 return (EINVAL);
1789
1790         is = malloc(sizeof(*is), M_ISCSI, M_ZERO | M_WAITOK);
1791         memcpy(&is->is_conf, &isa->isa_conf, sizeof(is->is_conf));
1792
1793         /*
1794          * Set some default values, from RFC 3720, section 12.
1795          *
1796          * These values are updated by the handoff IOCTL, but are
1797          * needed prior to the handoff to support sending the ISER
1798          * login PDU.
1799          */
1800         is->is_max_recv_data_segment_length = 8192;
1801         is->is_max_send_data_segment_length = 8192;
1802         is->is_max_burst_length = 262144;
1803         is->is_first_burst_length = 65536;
1804
1805         sx_xlock(&sc->sc_lock);
1806
1807         /*
1808          * Prevent duplicates.
1809          */
1810         TAILQ_FOREACH(is2, &sc->sc_sessions, is_next) {
1811                 if (!!is->is_conf.isc_discovery !=
1812                     !!is2->is_conf.isc_discovery)
1813                         continue;
1814
1815                 if (strcmp(is->is_conf.isc_target_addr,
1816                     is2->is_conf.isc_target_addr) != 0)
1817                         continue;
1818
1819                 if (is->is_conf.isc_discovery == 0 &&
1820                     strcmp(is->is_conf.isc_target,
1821                     is2->is_conf.isc_target) != 0)
1822                         continue;
1823
1824                 sx_xunlock(&sc->sc_lock);
1825                 free(is, M_ISCSI);
1826                 return (EBUSY);
1827         }
1828
1829         is->is_conn = icl_new_conn(is->is_conf.isc_offload,
1830             is->is_conf.isc_iser, "iscsi", &is->is_lock);
1831         if (is->is_conn == NULL) {
1832                 sx_xunlock(&sc->sc_lock);
1833                 free(is, M_ISCSI);
1834                 return (EINVAL);
1835         }
1836         is->is_conn->ic_receive = iscsi_receive_callback;
1837         is->is_conn->ic_error = iscsi_error_callback;
1838         is->is_conn->ic_prv0 = is;
1839         TAILQ_INIT(&is->is_outstanding);
1840         STAILQ_INIT(&is->is_postponed);
1841         mtx_init(&is->is_lock, "iscsi_lock", NULL, MTX_DEF);
1842         cv_init(&is->is_maintenance_cv, "iscsi_mt");
1843 #ifdef ICL_KERNEL_PROXY
1844         cv_init(&is->is_login_cv, "iscsi_login");
1845 #endif
1846
1847         is->is_softc = sc;
1848         sc->sc_last_session_id++;
1849         is->is_id = sc->sc_last_session_id;
1850         is->is_isid[0] = 0x80; /* RFC 3720, 10.12.5: 10b, "Random" ISID. */
1851         arc4rand(&is->is_isid[1], 5, 0);
1852         is->is_tsih = 0;
1853         callout_init(&is->is_callout, 1);
1854
1855         error = kthread_add(iscsi_maintenance_thread, is, NULL, NULL, 0, 0, "iscsimt");
1856         if (error != 0) {
1857                 ISCSI_SESSION_WARN(is, "kthread_add(9) failed with error %d", error);
1858                 sx_xunlock(&sc->sc_lock);
1859                 return (error);
1860         }
1861
1862         callout_reset(&is->is_callout, 1 * hz, iscsi_callout, is);
1863         TAILQ_INSERT_TAIL(&sc->sc_sessions, is, is_next);
1864
1865         ISCSI_SESSION_LOCK(is);
1866         /*
1867          * Don't notify iscsid(8) if the session is disabled and it's not
1868          * a discovery session,
1869          */
1870         if (is->is_conf.isc_enable == 0 && is->is_conf.isc_discovery == 0) {
1871                 ISCSI_SESSION_UNLOCK(is);
1872                 sx_xunlock(&sc->sc_lock);
1873                 return (0);
1874         }
1875
1876         is->is_waiting_for_iscsid = true;
1877         strlcpy(is->is_reason, "Waiting for iscsid(8)", sizeof(is->is_reason));
1878         ISCSI_SESSION_UNLOCK(is);
1879         cv_signal(&sc->sc_cv);
1880         sx_xunlock(&sc->sc_lock);
1881         return (0);
1882 }
1883
1884 static bool
1885 iscsi_session_conf_matches(unsigned int id1, const struct iscsi_session_conf *c1,
1886     unsigned int id2, const struct iscsi_session_conf *c2)
1887 {
1888
1889         if (id2 != 0 && id2 != id1)
1890                 return (false);
1891         if (c2->isc_target[0] != '\0' &&
1892             strcmp(c1->isc_target, c2->isc_target) != 0)
1893                 return (false);
1894         if (c2->isc_target_addr[0] != '\0' &&
1895             strcmp(c1->isc_target_addr, c2->isc_target_addr) != 0)
1896                 return (false);
1897         return (true);
1898 }
1899
1900 static int
1901 iscsi_ioctl_session_remove(struct iscsi_softc *sc,
1902     struct iscsi_session_remove *isr)
1903 {
1904         struct iscsi_session *is, *tmp;
1905         bool found = false;
1906
1907         iscsi_sanitize_session_conf(&isr->isr_conf);
1908
1909         sx_xlock(&sc->sc_lock);
1910         TAILQ_FOREACH_SAFE(is, &sc->sc_sessions, is_next, tmp) {
1911                 ISCSI_SESSION_LOCK(is);
1912                 if (iscsi_session_conf_matches(is->is_id, &is->is_conf,
1913                     isr->isr_session_id, &isr->isr_conf)) {
1914                         found = true;
1915                         iscsi_session_logout(is);
1916                         iscsi_session_terminate(is);
1917                 }
1918                 ISCSI_SESSION_UNLOCK(is);
1919         }
1920         sx_xunlock(&sc->sc_lock);
1921
1922         if (!found)
1923                 return (ESRCH);
1924
1925         return (0);
1926 }
1927
1928 static int
1929 iscsi_ioctl_session_list(struct iscsi_softc *sc, struct iscsi_session_list *isl)
1930 {
1931         int error;
1932         unsigned int i = 0;
1933         struct iscsi_session *is;
1934         struct iscsi_session_state iss;
1935
1936         sx_slock(&sc->sc_lock);
1937         TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1938                 if (i >= isl->isl_nentries) {
1939                         sx_sunlock(&sc->sc_lock);
1940                         return (EMSGSIZE);
1941                 }
1942                 memset(&iss, 0, sizeof(iss));
1943                 memcpy(&iss.iss_conf, &is->is_conf, sizeof(iss.iss_conf));
1944                 iss.iss_id = is->is_id;
1945                 strlcpy(iss.iss_target_alias, is->is_target_alias, sizeof(iss.iss_target_alias));
1946                 strlcpy(iss.iss_reason, is->is_reason, sizeof(iss.iss_reason));
1947                 strlcpy(iss.iss_offload, is->is_conn->ic_offload, sizeof(iss.iss_offload));
1948
1949                 if (is->is_conn->ic_header_crc32c)
1950                         iss.iss_header_digest = ISCSI_DIGEST_CRC32C;
1951                 else
1952                         iss.iss_header_digest = ISCSI_DIGEST_NONE;
1953
1954                 if (is->is_conn->ic_data_crc32c)
1955                         iss.iss_data_digest = ISCSI_DIGEST_CRC32C;
1956                 else
1957                         iss.iss_data_digest = ISCSI_DIGEST_NONE;
1958
1959                 iss.iss_max_send_data_segment_length =
1960                     is->is_max_send_data_segment_length;
1961                 iss.iss_max_recv_data_segment_length =
1962                     is->is_max_recv_data_segment_length;
1963                 iss.iss_max_burst_length = is->is_max_burst_length;
1964                 iss.iss_first_burst_length = is->is_first_burst_length;
1965                 iss.iss_immediate_data = is->is_immediate_data;
1966                 iss.iss_connected = is->is_connected;
1967
1968                 error = copyout(&iss, isl->isl_pstates + i, sizeof(iss));
1969                 if (error != 0) {
1970                         sx_sunlock(&sc->sc_lock);
1971                         return (error);
1972                 }
1973                 i++;
1974         }
1975         sx_sunlock(&sc->sc_lock);
1976
1977         isl->isl_nentries = i;
1978
1979         return (0);
1980 }
1981
1982 static int
1983 iscsi_ioctl_session_modify(struct iscsi_softc *sc,
1984     struct iscsi_session_modify *ism)
1985 {
1986         struct iscsi_session *is;
1987         const struct iscsi_session *is2;
1988
1989         iscsi_sanitize_session_conf(&ism->ism_conf);
1990         if (iscsi_valid_session_conf(&ism->ism_conf) == false)
1991                 return (EINVAL);
1992
1993         sx_xlock(&sc->sc_lock);
1994         TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1995                 ISCSI_SESSION_LOCK(is);
1996                 if (is->is_id == ism->ism_session_id) {
1997                         /* Note that the session remains locked. */
1998                         break;
1999                 }
2000                 ISCSI_SESSION_UNLOCK(is);
2001         }
2002         if (is == NULL) {
2003                 sx_xunlock(&sc->sc_lock);
2004                 return (ESRCH);
2005         }
2006
2007         /*
2008          * Prevent duplicates.
2009          */
2010         TAILQ_FOREACH(is2, &sc->sc_sessions, is_next) {
2011                 if (is == is2)
2012                         continue;
2013
2014                 if (!!ism->ism_conf.isc_discovery !=
2015                     !!is2->is_conf.isc_discovery)
2016                         continue;
2017
2018                 if (strcmp(ism->ism_conf.isc_target_addr,
2019                     is2->is_conf.isc_target_addr) != 0)
2020                         continue;
2021
2022                 if (ism->ism_conf.isc_discovery == 0 &&
2023                     strcmp(ism->ism_conf.isc_target,
2024                     is2->is_conf.isc_target) != 0)
2025                         continue;
2026
2027                 ISCSI_SESSION_UNLOCK(is);
2028                 sx_xunlock(&sc->sc_lock);
2029                 return (EBUSY);
2030         }
2031
2032         sx_xunlock(&sc->sc_lock);
2033
2034         memcpy(&is->is_conf, &ism->ism_conf, sizeof(is->is_conf));
2035         ISCSI_SESSION_UNLOCK(is);
2036
2037         iscsi_session_reconnect(is);
2038
2039         return (0);
2040 }
2041
2042 static int
2043 iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, int mode,
2044     struct thread *td)
2045 {
2046         struct iscsi_softc *sc;
2047
2048         sc = dev->si_drv1;
2049
2050         switch (cmd) {
2051         case ISCSIDWAIT:
2052                 return (iscsi_ioctl_daemon_wait(sc,
2053                     (struct iscsi_daemon_request *)arg));
2054         case ISCSIDHANDOFF:
2055                 return (iscsi_ioctl_daemon_handoff(sc,
2056                     (struct iscsi_daemon_handoff *)arg));
2057         case ISCSIDFAIL:
2058                 return (iscsi_ioctl_daemon_fail(sc,
2059                     (struct iscsi_daemon_fail *)arg));
2060 #ifdef ICL_KERNEL_PROXY
2061         case ISCSIDCONNECT:
2062                 return (iscsi_ioctl_daemon_connect(sc,
2063                     (struct iscsi_daemon_connect *)arg));
2064         case ISCSIDSEND:
2065                 return (iscsi_ioctl_daemon_send(sc,
2066                     (struct iscsi_daemon_send *)arg));
2067         case ISCSIDRECEIVE:
2068                 return (iscsi_ioctl_daemon_receive(sc,
2069                     (struct iscsi_daemon_receive *)arg));
2070 #endif /* ICL_KERNEL_PROXY */
2071         case ISCSISADD:
2072                 return (iscsi_ioctl_session_add(sc,
2073                     (struct iscsi_session_add *)arg));
2074         case ISCSISREMOVE:
2075                 return (iscsi_ioctl_session_remove(sc,
2076                     (struct iscsi_session_remove *)arg));
2077         case ISCSISLIST:
2078                 return (iscsi_ioctl_session_list(sc,
2079                     (struct iscsi_session_list *)arg));
2080         case ISCSISMODIFY:
2081                 return (iscsi_ioctl_session_modify(sc,
2082                     (struct iscsi_session_modify *)arg));
2083         default:
2084                 return (EINVAL);
2085         }
2086 }
2087
2088 static struct iscsi_outstanding *
2089 iscsi_outstanding_find(struct iscsi_session *is, uint32_t initiator_task_tag)
2090 {
2091         struct iscsi_outstanding *io;
2092
2093         ISCSI_SESSION_LOCK_ASSERT(is);
2094
2095         TAILQ_FOREACH(io, &is->is_outstanding, io_next) {
2096                 if (io->io_initiator_task_tag == initiator_task_tag)
2097                         return (io);
2098         }
2099         return (NULL);
2100 }
2101
2102 static struct iscsi_outstanding *
2103 iscsi_outstanding_find_ccb(struct iscsi_session *is, union ccb *ccb)
2104 {
2105         struct iscsi_outstanding *io;
2106
2107         ISCSI_SESSION_LOCK_ASSERT(is);
2108
2109         TAILQ_FOREACH(io, &is->is_outstanding, io_next) {
2110                 if (io->io_ccb == ccb)
2111                         return (io);
2112         }
2113         return (NULL);
2114 }
2115
2116 static struct iscsi_outstanding *
2117 iscsi_outstanding_add(struct iscsi_session *is, struct icl_pdu *request,
2118     union ccb *ccb, uint32_t *initiator_task_tagp)
2119 {
2120         struct iscsi_outstanding *io;
2121         int error;
2122
2123         ISCSI_SESSION_LOCK_ASSERT(is);
2124
2125         io = uma_zalloc(iscsi_outstanding_zone, M_NOWAIT | M_ZERO);
2126         if (io == NULL) {
2127                 ISCSI_SESSION_WARN(is, "failed to allocate %zd bytes",
2128                     sizeof(*io));
2129                 return (NULL);
2130         }
2131
2132         error = icl_conn_task_setup(is->is_conn, request, &ccb->csio,
2133             initiator_task_tagp, &io->io_icl_prv);
2134         if (error != 0) {
2135                 ISCSI_SESSION_WARN(is,
2136                     "icl_conn_task_setup() failed with error %d", error);
2137                 uma_zfree(iscsi_outstanding_zone, io);
2138                 return (NULL);
2139         }
2140
2141         KASSERT(iscsi_outstanding_find(is, *initiator_task_tagp) == NULL,
2142             ("initiator_task_tag 0x%x already added", *initiator_task_tagp));
2143
2144         io->io_initiator_task_tag = *initiator_task_tagp;
2145         io->io_ccb = ccb;
2146         TAILQ_INSERT_TAIL(&is->is_outstanding, io, io_next);
2147         return (io);
2148 }
2149
2150 static void
2151 iscsi_outstanding_remove(struct iscsi_session *is, struct iscsi_outstanding *io)
2152 {
2153
2154         ISCSI_SESSION_LOCK_ASSERT(is);
2155
2156         icl_conn_task_done(is->is_conn, io->io_icl_prv);
2157         TAILQ_REMOVE(&is->is_outstanding, io, io_next);
2158         uma_zfree(iscsi_outstanding_zone, io);
2159 }
2160
2161 static void
2162 iscsi_action_abort(struct iscsi_session *is, union ccb *ccb)
2163 {
2164         struct icl_pdu *request;
2165         struct iscsi_bhs_task_management_request *bhstmr;
2166         struct ccb_abort *cab = &ccb->cab;
2167         struct iscsi_outstanding *io, *aio;
2168         uint32_t initiator_task_tag;
2169
2170         ISCSI_SESSION_LOCK_ASSERT(is);
2171
2172 #if 0
2173         KASSERT(is->is_login_phase == false, ("%s called during Login Phase", __func__));
2174 #else
2175         if (is->is_login_phase) {
2176                 ccb->ccb_h.status = CAM_REQ_ABORTED;
2177                 xpt_done(ccb);
2178                 return;
2179         }
2180 #endif
2181
2182         aio = iscsi_outstanding_find_ccb(is, cab->abort_ccb);
2183         if (aio == NULL) {
2184                 ccb->ccb_h.status = CAM_REQ_CMP;
2185                 xpt_done(ccb);
2186                 return;
2187         }
2188
2189         request = icl_pdu_new(is->is_conn, M_NOWAIT);
2190         if (request == NULL) {
2191                 ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
2192                 xpt_done(ccb);
2193                 return;
2194         }
2195
2196         initiator_task_tag = is->is_initiator_task_tag++;
2197
2198         io = iscsi_outstanding_add(is, request, NULL, &initiator_task_tag);
2199         if (io == NULL) {
2200                 icl_pdu_free(request);
2201                 ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
2202                 xpt_done(ccb);
2203                 return;
2204         }
2205         io->io_datasn = aio->io_initiator_task_tag;
2206
2207         bhstmr = (struct iscsi_bhs_task_management_request *)request->ip_bhs;
2208         bhstmr->bhstmr_opcode = ISCSI_BHS_OPCODE_TASK_REQUEST;
2209         bhstmr->bhstmr_function = 0x80 | BHSTMR_FUNCTION_ABORT_TASK;
2210         bhstmr->bhstmr_lun = htobe64(CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun));
2211         bhstmr->bhstmr_initiator_task_tag = initiator_task_tag;
2212         bhstmr->bhstmr_referenced_task_tag = aio->io_initiator_task_tag;
2213
2214         iscsi_pdu_queue_locked(request);
2215 }
2216
2217 static void
2218 iscsi_action_scsiio(struct iscsi_session *is, union ccb *ccb)
2219 {
2220         struct icl_pdu *request;
2221         struct iscsi_bhs_scsi_command *bhssc;
2222         struct ccb_scsiio *csio;
2223         struct iscsi_outstanding *io;
2224         size_t len;
2225         uint32_t initiator_task_tag;
2226         int error;
2227
2228         ISCSI_SESSION_LOCK_ASSERT(is);
2229
2230 #if 0
2231         KASSERT(is->is_login_phase == false, ("%s called during Login Phase", __func__));
2232 #else
2233         if (is->is_login_phase) {
2234                 ISCSI_SESSION_DEBUG(is, "called during login phase");
2235                 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
2236                         xpt_freeze_devq(ccb->ccb_h.path, 1);
2237                         ISCSI_SESSION_DEBUG(is, "freezing devq");
2238                 }
2239                 ccb->ccb_h.status = CAM_REQ_ABORTED | CAM_DEV_QFRZN;
2240                 xpt_done(ccb);
2241                 return;
2242         }
2243 #endif
2244
2245         request = icl_pdu_new(is->is_conn, M_NOWAIT);
2246         if (request == NULL) {
2247                 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
2248                         xpt_freeze_devq(ccb->ccb_h.path, 1);
2249                         ISCSI_SESSION_DEBUG(is, "freezing devq");
2250                 }
2251                 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN;
2252                 xpt_done(ccb);
2253                 return;
2254         }
2255
2256         initiator_task_tag = is->is_initiator_task_tag++;
2257         io = iscsi_outstanding_add(is, request, ccb, &initiator_task_tag);
2258         if (io == NULL) {
2259                 icl_pdu_free(request);
2260                 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
2261                         xpt_freeze_devq(ccb->ccb_h.path, 1);
2262                         ISCSI_SESSION_DEBUG(is, "freezing devq");
2263                 }
2264                 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN;
2265                 xpt_done(ccb);
2266                 return;
2267         }
2268
2269         csio = &ccb->csio;
2270         bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs;
2271         bhssc->bhssc_opcode = ISCSI_BHS_OPCODE_SCSI_COMMAND;
2272         bhssc->bhssc_flags |= BHSSC_FLAGS_F;
2273         switch (csio->ccb_h.flags & CAM_DIR_MASK) {
2274         case CAM_DIR_IN:
2275                 bhssc->bhssc_flags |= BHSSC_FLAGS_R;
2276                 break;
2277         case CAM_DIR_OUT:
2278                 bhssc->bhssc_flags |= BHSSC_FLAGS_W;
2279                 break;
2280         }
2281
2282         if ((ccb->ccb_h.flags & CAM_TAG_ACTION_VALID) != 0) {
2283                 switch (csio->tag_action) {
2284                 case MSG_HEAD_OF_Q_TAG:
2285                         bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_HOQ;
2286                         break;
2287                 case MSG_ORDERED_Q_TAG:
2288                         bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_ORDERED;
2289                         break;
2290                 case MSG_ACA_TASK:
2291                         bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_ACA;
2292                         break;
2293                 case MSG_SIMPLE_Q_TAG:
2294                 default:
2295                         bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_SIMPLE;
2296                         break;
2297                 }
2298         } else
2299                 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_UNTAGGED;
2300
2301         bhssc->bhssc_lun = htobe64(CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun));
2302         bhssc->bhssc_initiator_task_tag = initiator_task_tag;
2303         bhssc->bhssc_expected_data_transfer_length = htonl(csio->dxfer_len);
2304         KASSERT(csio->cdb_len <= sizeof(bhssc->bhssc_cdb),
2305             ("unsupported CDB size %zd", (size_t)csio->cdb_len));
2306
2307         if (csio->ccb_h.flags & CAM_CDB_POINTER)
2308                 memcpy(&bhssc->bhssc_cdb, csio->cdb_io.cdb_ptr, csio->cdb_len);
2309         else
2310                 memcpy(&bhssc->bhssc_cdb, csio->cdb_io.cdb_bytes, csio->cdb_len);
2311
2312         if (is->is_immediate_data &&
2313             (csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT) {
2314                 len = csio->dxfer_len;
2315                 //ISCSI_SESSION_DEBUG(is, "adding %zd of immediate data", len);
2316                 if (len > is->is_first_burst_length) {
2317                         ISCSI_SESSION_DEBUG(is, "len %zd -> %d", len, is->is_first_burst_length);
2318                         len = is->is_first_burst_length;
2319                 }
2320                 if (len > is->is_max_send_data_segment_length) {
2321                         ISCSI_SESSION_DEBUG(is, "len %zd -> %d", len,
2322                             is->is_max_send_data_segment_length);
2323                         len = is->is_max_send_data_segment_length;
2324                 }
2325
2326                 error = icl_pdu_append_data(request, csio->data_ptr, len, M_NOWAIT);
2327                 if (error != 0) {
2328                         iscsi_outstanding_remove(is, io);
2329                         icl_pdu_free(request);
2330                         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
2331                                 xpt_freeze_devq(ccb->ccb_h.path, 1);
2332                                 ISCSI_SESSION_DEBUG(is, "freezing devq");
2333                         }
2334                         ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN;
2335                         xpt_done(ccb);
2336                         return;
2337                 }
2338         }
2339         iscsi_pdu_queue_locked(request);
2340 }
2341
2342 static void
2343 iscsi_action(struct cam_sim *sim, union ccb *ccb)
2344 {
2345         struct iscsi_session *is;
2346
2347         is = cam_sim_softc(sim);
2348
2349         ISCSI_SESSION_LOCK_ASSERT(is);
2350
2351         if (is->is_terminating ||
2352             (is->is_connected == false && fail_on_disconnection)) {
2353                 ccb->ccb_h.status = CAM_DEV_NOT_THERE;
2354                 xpt_done(ccb);
2355                 return;
2356         }
2357
2358         switch (ccb->ccb_h.func_code) {
2359         case XPT_PATH_INQ:
2360         {
2361                 struct ccb_pathinq *cpi = &ccb->cpi;
2362
2363                 cpi->version_num = 1;
2364                 cpi->hba_inquiry = PI_TAG_ABLE;
2365                 cpi->target_sprt = 0;
2366                 cpi->hba_misc = PIM_EXTLUNS;
2367                 /*
2368                  * XXX: It shouldn't ever be NULL; this could be turned
2369                  *      into a KASSERT eventually.
2370                  */
2371                 if (is->is_conn == NULL)
2372                         ISCSI_WARN("NULL conn");
2373                 else if (is->is_conn->ic_unmapped)
2374                         cpi->hba_misc |= PIM_UNMAPPED;
2375                 cpi->hba_eng_cnt = 0;
2376                 cpi->max_target = 0;
2377                 /*
2378                  * Note that the variable below is only relevant for targets
2379                  * that don't claim compliance with anything above SPC2, which
2380                  * means they don't support REPORT_LUNS.
2381                  */
2382                 cpi->max_lun = 255;
2383                 cpi->initiator_id = ~0;
2384                 strlcpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
2385                 strlcpy(cpi->hba_vid, "iSCSI", HBA_IDLEN);
2386                 strlcpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN);
2387                 cpi->unit_number = cam_sim_unit(sim);
2388                 cpi->bus_id = cam_sim_bus(sim);
2389                 cpi->base_transfer_speed = 150000; /* XXX */
2390                 cpi->transport = XPORT_ISCSI;
2391                 cpi->transport_version = 0;
2392                 cpi->protocol = PROTO_SCSI;
2393                 cpi->protocol_version = SCSI_REV_SPC3;
2394                 cpi->maxio = MAXPHYS;
2395                 cpi->ccb_h.status = CAM_REQ_CMP;
2396                 break;
2397         }
2398         case XPT_GET_TRAN_SETTINGS:
2399         {
2400                 struct ccb_trans_settings       *cts;
2401                 struct ccb_trans_settings_scsi  *scsi;
2402
2403                 cts = &ccb->cts;
2404                 scsi = &cts->proto_specific.scsi;
2405
2406                 cts->protocol = PROTO_SCSI;
2407                 cts->protocol_version = SCSI_REV_SPC3;
2408                 cts->transport = XPORT_ISCSI;
2409                 cts->transport_version = 0;
2410                 scsi->valid = CTS_SCSI_VALID_TQ;
2411                 scsi->flags = CTS_SCSI_FLAGS_TAG_ENB;
2412                 cts->ccb_h.status = CAM_REQ_CMP;
2413                 break;
2414         }
2415         case XPT_CALC_GEOMETRY:
2416                 cam_calc_geometry(&ccb->ccg, /*extended*/1);
2417                 ccb->ccb_h.status = CAM_REQ_CMP;
2418                 break;
2419 #if 0
2420         /*
2421          * XXX: What's the point?
2422          */
2423         case XPT_RESET_BUS:
2424         case XPT_TERM_IO:
2425                 ISCSI_SESSION_DEBUG(is, "faking success for reset, abort, or term_io");
2426                 ccb->ccb_h.status = CAM_REQ_CMP;
2427                 break;
2428 #endif
2429         case XPT_ABORT:
2430                 iscsi_action_abort(is, ccb);
2431                 return;
2432         case XPT_SCSI_IO:
2433                 iscsi_action_scsiio(is, ccb);
2434                 return;
2435         default:
2436 #if 0
2437                 ISCSI_SESSION_DEBUG(is, "got unsupported code 0x%x", ccb->ccb_h.func_code);
2438 #endif
2439                 ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
2440                 break;
2441         }
2442         xpt_done(ccb);
2443 }
2444
2445 static void
2446 iscsi_poll(struct cam_sim *sim)
2447 {
2448
2449         KASSERT(0, ("%s: you're not supposed to be here", __func__));
2450 }
2451
2452 static void
2453 iscsi_terminate_sessions(struct iscsi_softc *sc)
2454 {
2455         struct iscsi_session *is;
2456
2457         sx_slock(&sc->sc_lock);
2458         TAILQ_FOREACH(is, &sc->sc_sessions, is_next)
2459                 iscsi_session_terminate(is);
2460         while(!TAILQ_EMPTY(&sc->sc_sessions)) {
2461                 ISCSI_DEBUG("waiting for sessions to terminate");
2462                 cv_wait(&sc->sc_cv, &sc->sc_lock);
2463         }
2464         ISCSI_DEBUG("all sessions terminated");
2465         sx_sunlock(&sc->sc_lock);
2466 }
2467
2468 static void
2469 iscsi_shutdown_pre(struct iscsi_softc *sc)
2470 {
2471         struct iscsi_session *is;
2472
2473         if (!fail_on_shutdown)
2474                 return;
2475
2476         /*
2477          * If we have any sessions waiting for reconnection, request
2478          * maintenance thread to fail them immediately instead of waiting
2479          * for reconnect timeout.
2480          *
2481          * This prevents LUNs with mounted filesystems that are supported
2482          * by disconnected iSCSI sessions from hanging, however it will
2483          * fail all queued BIOs.
2484          */
2485         ISCSI_DEBUG("forcing failing all disconnected sessions due to shutdown");
2486
2487         fail_on_disconnection = 1;
2488
2489         sx_slock(&sc->sc_lock);
2490         TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
2491                 ISCSI_SESSION_LOCK(is);
2492                 if (!is->is_connected) {
2493                         ISCSI_SESSION_DEBUG(is, "force failing disconnected session early");
2494                         iscsi_session_reconnect(is);
2495                 }
2496                 ISCSI_SESSION_UNLOCK(is);
2497         }
2498         sx_sunlock(&sc->sc_lock);
2499 }
2500
2501 static void
2502 iscsi_shutdown_post(struct iscsi_softc *sc)
2503 {
2504
2505         if (!KERNEL_PANICKED()) {
2506                 ISCSI_DEBUG("removing all sessions due to shutdown");
2507                 iscsi_terminate_sessions(sc);
2508         }
2509 }
2510
2511 static int
2512 iscsi_load(void)
2513 {
2514         int error;
2515
2516         sc = malloc(sizeof(*sc), M_ISCSI, M_ZERO | M_WAITOK);
2517         sx_init(&sc->sc_lock, "iscsi");
2518         TAILQ_INIT(&sc->sc_sessions);
2519         cv_init(&sc->sc_cv, "iscsi_cv");
2520
2521         iscsi_outstanding_zone = uma_zcreate("iscsi_outstanding",
2522             sizeof(struct iscsi_outstanding), NULL, NULL, NULL, NULL,
2523             UMA_ALIGN_PTR, 0);
2524
2525         error = make_dev_p(MAKEDEV_CHECKNAME, &sc->sc_cdev, &iscsi_cdevsw,
2526             NULL, UID_ROOT, GID_WHEEL, 0600, "iscsi");
2527         if (error != 0) {
2528                 ISCSI_WARN("failed to create device node, error %d", error);
2529                 return (error);
2530         }
2531         sc->sc_cdev->si_drv1 = sc;
2532
2533         sc->sc_shutdown_pre_eh = EVENTHANDLER_REGISTER(shutdown_pre_sync,
2534             iscsi_shutdown_pre, sc, SHUTDOWN_PRI_FIRST);
2535         /*
2536          * shutdown_post_sync needs to run after filesystem shutdown and before
2537          * CAM shutdown - otherwise when rebooting with an iSCSI session that is
2538          * disconnected but has outstanding requests, dashutdown() will hang on
2539          * cam_periph_runccb().
2540          */
2541         sc->sc_shutdown_post_eh = EVENTHANDLER_REGISTER(shutdown_post_sync,
2542             iscsi_shutdown_post, sc, SHUTDOWN_PRI_DEFAULT - 1);
2543
2544         return (0);
2545 }
2546
2547 static int
2548 iscsi_unload(void)
2549 {
2550
2551         if (sc->sc_cdev != NULL) {
2552                 ISCSI_DEBUG("removing device node");
2553                 destroy_dev(sc->sc_cdev);
2554                 ISCSI_DEBUG("device node removed");
2555         }
2556
2557         if (sc->sc_shutdown_pre_eh != NULL)
2558                 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, sc->sc_shutdown_pre_eh);
2559         if (sc->sc_shutdown_post_eh != NULL)
2560                 EVENTHANDLER_DEREGISTER(shutdown_post_sync, sc->sc_shutdown_post_eh);
2561
2562         iscsi_terminate_sessions(sc);
2563
2564         uma_zdestroy(iscsi_outstanding_zone);
2565         sx_destroy(&sc->sc_lock);
2566         cv_destroy(&sc->sc_cv);
2567         free(sc, M_ISCSI);
2568         return (0);
2569 }
2570
2571 static int
2572 iscsi_quiesce(void)
2573 {
2574         sx_slock(&sc->sc_lock);
2575         if (!TAILQ_EMPTY(&sc->sc_sessions)) {
2576                 sx_sunlock(&sc->sc_lock);
2577                 return (EBUSY);
2578         }
2579         sx_sunlock(&sc->sc_lock);
2580         return (0);
2581 }
2582
2583 static int
2584 iscsi_modevent(module_t mod, int what, void *arg)
2585 {
2586         int error;
2587
2588         switch (what) {
2589         case MOD_LOAD:
2590                 error = iscsi_load();
2591                 break;
2592         case MOD_UNLOAD:
2593                 error = iscsi_unload();
2594                 break;
2595         case MOD_QUIESCE:
2596                 error = iscsi_quiesce();
2597                 break;
2598         default:
2599                 error = EINVAL;
2600                 break;
2601         }
2602         return (error);
2603 }
2604
2605 moduledata_t iscsi_data = {
2606         "iscsi",
2607         iscsi_modevent,
2608         0
2609 };
2610
2611 DECLARE_MODULE(iscsi, iscsi_data, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
2612 MODULE_DEPEND(iscsi, cam, 1, 1, 1);
2613 MODULE_DEPEND(iscsi, icl, 1, 1, 1);