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