1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2012 The FreeBSD Foundation
5 *
6 * This software was developed by Edward Tomasz Napierala under sponsorship
7 * from the FreeBSD Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 */
31
32 #include <sys/param.h>
33 #include <sys/bio.h>
34 #include <sys/condvar.h>
35 #include <sys/conf.h>
36 #include <sys/endian.h>
37 #include <sys/eventhandler.h>
38 #include <sys/file.h>
39 #include <sys/kernel.h>
40 #include <sys/kthread.h>
41 #include <sys/lock.h>
42 #include <sys/malloc.h>
43 #include <sys/mbuf.h>
44 #include <sys/mutex.h>
45 #include <sys/module.h>
46 #include <sys/proc.h>
47 #include <sys/reboot.h>
48 #include <sys/socket.h>
49 #include <sys/sockopt.h>
50 #include <sys/sysctl.h>
51 #include <sys/systm.h>
52 #include <sys/sx.h>
53
54 #include <vm/uma.h>
55
56 #include <cam/cam.h>
57 #include <cam/cam_ccb.h>
58 #include <cam/cam_xpt.h>
59 #include <cam/cam_debug.h>
60 #include <cam/cam_sim.h>
61 #include <cam/cam_xpt_sim.h>
62 #include <cam/cam_xpt_periph.h>
63 #include <cam/cam_periph.h>
64 #include <cam/scsi/scsi_all.h>
65 #include <cam/scsi/scsi_message.h>
66
67 #include <dev/iscsi/icl.h>
68 #include <dev/iscsi/icl_wrappers.h>
69 #include <dev/iscsi/iscsi_ioctl.h>
70 #include <dev/iscsi/iscsi_proto.h>
71 #include <dev/iscsi/iscsi.h>
72
73 #ifdef ICL_KERNEL_PROXY
74 #include <sys/socketvar.h>
75 #endif
76
77 #ifdef ICL_KERNEL_PROXY
78 FEATURE(iscsi_kernel_proxy, "iSCSI initiator built with ICL_KERNEL_PROXY");
79 #endif
80
81 #ifdef COMPAT_FREEBSD13
82 struct iscsi_daemon_request13 {
83 unsigned int idr_session_id;
84 struct iscsi_session_conf idr_conf;
85 uint8_t idr_isid[6];
86 uint16_t idr_tsih;
87 uint16_t idr_spare_cid;
88 struct iscsi_session_limits idr_limits;
89 int idr_spare[4];
90 };
91
92 #define ISCSIDWAIT13 _IOR('I', 0x01, struct iscsi_daemon_request13)
93 #endif
94
95 /*
96 * XXX: This is global so the iscsi_unload() can access it.
97 * Think about how to do this properly.
98 */
99 static struct iscsi_softc *sc;
100
101 SYSCTL_NODE(_kern, OID_AUTO, iscsi, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
102 "iSCSI initiator");
103 static int debug = 1;
104 SYSCTL_INT(_kern_iscsi, OID_AUTO, debug, CTLFLAG_RWTUN,
105 &debug, 0, "Enable debug messages");
106
107 static int ping_timeout = 5;
108 SYSCTL_INT(_kern_iscsi, OID_AUTO, ping_timeout, CTLFLAG_RWTUN, &ping_timeout,
109 0, "Timeout for ping (NOP-Out) requests, in seconds");
110 static int iscsid_timeout = 60;
111 SYSCTL_INT(_kern_iscsi, OID_AUTO, iscsid_timeout, CTLFLAG_RWTUN, &iscsid_timeout,
112 0, "Time to wait for iscsid(8) to handle reconnection, in seconds");
113 static int login_timeout = 60;
114 SYSCTL_INT(_kern_iscsi, OID_AUTO, login_timeout, CTLFLAG_RWTUN, &login_timeout,
115 0, "Time to wait for iscsid(8) to finish Login Phase, in seconds");
116 static int maxtags = 255;
117 SYSCTL_INT(_kern_iscsi, OID_AUTO, maxtags, CTLFLAG_RWTUN, &maxtags,
118 0, "Max number of IO requests queued");
119 static int fail_on_disconnection = 0;
120 SYSCTL_INT(_kern_iscsi, OID_AUTO, fail_on_disconnection, CTLFLAG_RWTUN,
121 &fail_on_disconnection, 0, "Destroy CAM SIM on connection failure");
122 static int fail_on_shutdown = 1;
123 SYSCTL_INT(_kern_iscsi, OID_AUTO, fail_on_shutdown, CTLFLAG_RWTUN,
124 &fail_on_shutdown, 0, "Fail disconnected sessions on shutdown");
125
126 static MALLOC_DEFINE(M_ISCSI, "iSCSI", "iSCSI initiator");
127 static uma_zone_t iscsi_outstanding_zone;
128
129 #define CONN_SESSION(X) ((struct iscsi_session *)X->ic_prv0)
130 #define PDU_SESSION(X) (CONN_SESSION(X->ip_conn))
131
132 #define ISCSI_DEBUG(X, ...) \
133 do { \
134 if (debug > 1) \
135 printf("%s: " X "\n", __func__, ## __VA_ARGS__);\
136 } while (0)
137
138 #define ISCSI_WARN(X, ...) \
139 do { \
140 if (debug > 0) { \
141 printf("WARNING: %s: " X "\n", \
142 __func__, ## __VA_ARGS__); \
143 } \
144 } while (0)
145
146 #define ISCSI_SESSION_DEBUG(S, X, ...) \
147 do { \
148 if (debug > 1) { \
149 printf("%s: %s (%s): " X "\n", \
150 __func__, S->is_conf.isc_target_addr, \
151 S->is_conf.isc_target, ## __VA_ARGS__); \
152 } \
153 } while (0)
154
155 #define ISCSI_SESSION_WARN(S, X, ...) \
156 do { \
157 if (debug > 0) { \
158 printf("WARNING: %s (%s): " X "\n", \
159 S->is_conf.isc_target_addr, \
160 S->is_conf.isc_target, ## __VA_ARGS__); \
161 } \
162 } while (0)
163
164 #define ISCSI_SESSION_LOCK(X) mtx_lock(&X->is_lock)
165 #define ISCSI_SESSION_UNLOCK(X) mtx_unlock(&X->is_lock)
166 #define ISCSI_SESSION_LOCK_ASSERT(X) mtx_assert(&X->is_lock, MA_OWNED)
167 #define ISCSI_SESSION_LOCK_ASSERT_NOT(X) mtx_assert(&X->is_lock, MA_NOTOWNED)
168
169 static int iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg,
170 int mode, struct thread *td);
171
172 static struct cdevsw iscsi_cdevsw = {
173 .d_version = D_VERSION,
174 .d_ioctl = iscsi_ioctl,
175 .d_name = "iscsi",
176 };
177
178 static void iscsi_pdu_queue_locked(struct icl_pdu *request);
179 static void iscsi_pdu_queue(struct icl_pdu *request);
180 static void iscsi_pdu_update_statsn(const struct icl_pdu *response);
181 static void iscsi_pdu_handle_nop_in(struct icl_pdu *response);
182 static void iscsi_pdu_handle_scsi_response(struct icl_pdu *response);
183 static void iscsi_pdu_handle_task_response(struct icl_pdu *response);
184 static void iscsi_pdu_handle_data_in(struct icl_pdu *response);
185 static void iscsi_pdu_handle_logout_response(struct icl_pdu *response);
186 static void iscsi_pdu_handle_r2t(struct icl_pdu *response);
187 static void iscsi_pdu_handle_async_message(struct icl_pdu *response);
188 static void iscsi_pdu_handle_reject(struct icl_pdu *response);
189 static void iscsi_session_reconnect(struct iscsi_session *is);
190 static void iscsi_session_terminate(struct iscsi_session *is);
191 static void iscsi_action(struct cam_sim *sim, union ccb *ccb);
192 static struct iscsi_outstanding *iscsi_outstanding_find(struct iscsi_session *is,
193 uint32_t initiator_task_tag);
194 static struct iscsi_outstanding *iscsi_outstanding_add(struct iscsi_session *is,
195 struct icl_pdu *request, union ccb *ccb,
196 uint32_t *initiator_task_tagp);
197 static void iscsi_outstanding_remove(struct iscsi_session *is,
198 struct iscsi_outstanding *io);
199
200 static bool
iscsi_pdu_prepare(struct icl_pdu * request)201 iscsi_pdu_prepare(struct icl_pdu *request)
202 {
203 struct iscsi_session *is;
204 struct iscsi_bhs_scsi_command *bhssc;
205
206 is = PDU_SESSION(request);
207
208 ISCSI_SESSION_LOCK_ASSERT(is);
209
210 /*
211 * We're only using fields common for all the request
212 * (initiator -> target) PDUs.
213 */
214 bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs;
215
216 /*
217 * Data-Out PDU does not contain CmdSN.
218 */
219 if (bhssc->bhssc_opcode != ISCSI_BHS_OPCODE_SCSI_DATA_OUT) {
220 if (ISCSI_SNGT(is->is_cmdsn, is->is_maxcmdsn) &&
221 (bhssc->bhssc_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0) {
222 /*
223 * Current MaxCmdSN prevents us from sending any more
224 * SCSI Command PDUs to the target; postpone the PDU.
225 * It will get resent by either iscsi_pdu_queue(),
226 * or by maintenance thread.
227 */
228 #if 0
229 ISCSI_SESSION_DEBUG(is, "postponing send, CmdSN %u, "
230 "ExpCmdSN %u, MaxCmdSN %u, opcode 0x%x",
231 is->is_cmdsn, is->is_expcmdsn, is->is_maxcmdsn,
232 bhssc->bhssc_opcode);
233 #endif
234 return (true);
235 }
236 bhssc->bhssc_cmdsn = htonl(is->is_cmdsn);
237 if ((bhssc->bhssc_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0)
238 is->is_cmdsn++;
239 }
240 bhssc->bhssc_expstatsn = htonl(is->is_statsn + 1);
241
242 return (false);
243 }
244
245 static void
iscsi_session_send_postponed(struct iscsi_session * is)246 iscsi_session_send_postponed(struct iscsi_session *is)
247 {
248 struct icl_pdu *request;
249 bool postpone;
250
251 ISCSI_SESSION_LOCK_ASSERT(is);
252
253 if (STAILQ_EMPTY(&is->is_postponed))
254 return;
255 while ((request = STAILQ_FIRST(&is->is_postponed)) != NULL) {
256 postpone = iscsi_pdu_prepare(request);
257 if (postpone)
258 return;
259 STAILQ_REMOVE_HEAD(&is->is_postponed, ip_next);
260 icl_pdu_queue(request);
261 }
262 xpt_release_simq(is->is_sim, 1);
263 }
264
265 static void
iscsi_pdu_queue_locked(struct icl_pdu * request)266 iscsi_pdu_queue_locked(struct icl_pdu *request)
267 {
268 struct iscsi_session *is;
269 bool postpone;
270
271 is = PDU_SESSION(request);
272 ISCSI_SESSION_LOCK_ASSERT(is);
273 iscsi_session_send_postponed(is);
274 postpone = iscsi_pdu_prepare(request);
275 if (postpone) {
276 if (STAILQ_EMPTY(&is->is_postponed))
277 xpt_freeze_simq(is->is_sim, 1);
278 STAILQ_INSERT_TAIL(&is->is_postponed, request, ip_next);
279 return;
280 }
281 icl_pdu_queue(request);
282 }
283
284 static void
iscsi_pdu_queue(struct icl_pdu * request)285 iscsi_pdu_queue(struct icl_pdu *request)
286 {
287 struct iscsi_session *is;
288
289 is = PDU_SESSION(request);
290 ISCSI_SESSION_LOCK(is);
291 iscsi_pdu_queue_locked(request);
292 ISCSI_SESSION_UNLOCK(is);
293 }
294
295 static void
iscsi_session_logout(struct iscsi_session * is)296 iscsi_session_logout(struct iscsi_session *is)
297 {
298 struct icl_pdu *request;
299 struct iscsi_bhs_logout_request *bhslr;
300
301 request = icl_pdu_new(is->is_conn, M_NOWAIT);
302 if (request == NULL)
303 return;
304
305 bhslr = (struct iscsi_bhs_logout_request *)request->ip_bhs;
306 bhslr->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_REQUEST;
307 bhslr->bhslr_reason = BHSLR_REASON_CLOSE_SESSION;
308 iscsi_pdu_queue_locked(request);
309 }
310
311 static void
iscsi_session_terminate_task(struct iscsi_session * is,struct iscsi_outstanding * io,cam_status status)312 iscsi_session_terminate_task(struct iscsi_session *is,
313 struct iscsi_outstanding *io, cam_status status)
314 {
315
316 ISCSI_SESSION_LOCK_ASSERT(is);
317
318 if (io->io_ccb != NULL) {
319 io->io_ccb->ccb_h.status &= ~(CAM_SIM_QUEUED | CAM_STATUS_MASK);
320 io->io_ccb->ccb_h.status |= status;
321 if ((io->io_ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
322 io->io_ccb->ccb_h.status |= CAM_DEV_QFRZN;
323 xpt_freeze_devq(io->io_ccb->ccb_h.path, 1);
324 ISCSI_SESSION_DEBUG(is, "freezing devq");
325 }
326 xpt_done(io->io_ccb);
327 }
328 iscsi_outstanding_remove(is, io);
329 }
330
331 static void
iscsi_session_terminate_tasks(struct iscsi_session * is,cam_status status)332 iscsi_session_terminate_tasks(struct iscsi_session *is, cam_status status)
333 {
334 struct iscsi_outstanding *io, *tmp;
335
336 ISCSI_SESSION_LOCK_ASSERT(is);
337
338 TAILQ_FOREACH_SAFE(io, &is->is_outstanding, io_next, tmp) {
339 iscsi_session_terminate_task(is, io, status);
340 }
341 }
342
343 static void
iscsi_session_cleanup(struct iscsi_session * is,bool destroy_sim)344 iscsi_session_cleanup(struct iscsi_session *is, bool destroy_sim)
345 {
346 struct icl_pdu *pdu;
347
348 ISCSI_SESSION_LOCK_ASSERT(is);
349
350 /*
351 * Don't queue any new PDUs.
352 */
353 if (is->is_sim != NULL && is->is_simq_frozen == false) {
354 ISCSI_SESSION_DEBUG(is, "freezing");
355 xpt_freeze_simq(is->is_sim, 1);
356 is->is_simq_frozen = true;
357 }
358
359 /*
360 * Remove postponed PDUs.
361 */
362 if (!STAILQ_EMPTY(&is->is_postponed))
363 xpt_release_simq(is->is_sim, 1);
364 while ((pdu = STAILQ_FIRST(&is->is_postponed)) != NULL) {
365 STAILQ_REMOVE_HEAD(&is->is_postponed, ip_next);
366 icl_pdu_free(pdu);
367 }
368
369 if (destroy_sim == false) {
370 /*
371 * Terminate SCSI tasks, asking CAM to requeue them.
372 */
373 iscsi_session_terminate_tasks(is, CAM_REQUEUE_REQ);
374 return;
375 }
376
377 iscsi_session_terminate_tasks(is, CAM_DEV_NOT_THERE);
378
379 if (is->is_sim == NULL)
380 return;
381
382 ISCSI_SESSION_DEBUG(is, "deregistering SIM");
383 xpt_async(AC_LOST_DEVICE, is->is_path, NULL);
384
385 if (is->is_simq_frozen) {
386 is->is_simq_frozen = false;
387 xpt_release_simq(is->is_sim, 1);
388 }
389
390 xpt_free_path(is->is_path);
391 is->is_path = NULL;
392 xpt_bus_deregister(cam_sim_path(is->is_sim));
393 cam_sim_free(is->is_sim, TRUE /*free_devq*/);
394 is->is_sim = NULL;
395 is->is_devq = NULL;
396 }
397
398 static void
iscsi_maintenance_thread_reconnect(struct iscsi_session * is)399 iscsi_maintenance_thread_reconnect(struct iscsi_session *is)
400 {
401 /*
402 * As we will be reconnecting shortly,
403 * discard outstanding data immediately on
404 * close(), also notify peer via RST if
405 * any packets come in.
406 */
407 struct socket *so;
408 so = is->is_conn->ic_socket;
409 if (so != NULL) {
410 struct sockopt sopt;
411 struct linger sl;
412 sopt.sopt_dir = SOPT_SET;
413 sopt.sopt_level = SOL_SOCKET;
414 sopt.sopt_name = SO_LINGER;
415 sopt.sopt_val = &sl;
416 sopt.sopt_valsize = sizeof(sl);
417 sl.l_onoff = 1; /* non-zero value enables linger option in kernel */
418 sl.l_linger = 0; /* timeout interval in seconds */
419 sosetopt(is->is_conn->ic_socket, &sopt);
420 }
421
422 icl_conn_close(is->is_conn);
423
424 ISCSI_SESSION_LOCK(is);
425
426 is->is_connected = false;
427 is->is_reconnecting = false;
428 is->is_login_phase = false;
429
430 #ifdef ICL_KERNEL_PROXY
431 if (is->is_login_pdu != NULL) {
432 icl_pdu_free(is->is_login_pdu);
433 is->is_login_pdu = NULL;
434 }
435 cv_signal(&is->is_login_cv);
436 #endif
437
438 if (fail_on_disconnection) {
439 ISCSI_SESSION_DEBUG(is, "connection failed, destroying devices");
440 iscsi_session_cleanup(is, true);
441 } else {
442 iscsi_session_cleanup(is, false);
443 }
444
445 KASSERT(TAILQ_EMPTY(&is->is_outstanding),
446 ("destroying session with active tasks"));
447 KASSERT(STAILQ_EMPTY(&is->is_postponed),
448 ("destroying session with postponed PDUs"));
449
450 if (is->is_conf.isc_enable == 0 && is->is_conf.isc_discovery == 0) {
451 ISCSI_SESSION_UNLOCK(is);
452 return;
453 }
454
455 /*
456 * Request immediate reconnection from iscsid(8).
457 */
458 //ISCSI_SESSION_DEBUG(is, "waking up iscsid(8)");
459 is->is_waiting_for_iscsid = true;
460 strlcpy(is->is_reason, "Waiting for iscsid(8)", sizeof(is->is_reason));
461 is->is_timeout = 0;
462 ISCSI_SESSION_UNLOCK(is);
463 cv_signal(&is->is_softc->sc_cv);
464 }
465
466 static void
iscsi_maintenance_thread_terminate(struct iscsi_session * is)467 iscsi_maintenance_thread_terminate(struct iscsi_session *is)
468 {
469 struct iscsi_softc *sc;
470
471 sc = is->is_softc;
472 sx_xlock(&sc->sc_lock);
473 TAILQ_REMOVE(&sc->sc_sessions, is, is_next);
474 sx_xunlock(&sc->sc_lock);
475
476 icl_conn_close(is->is_conn);
477 callout_drain(&is->is_callout);
478
479 ISCSI_SESSION_LOCK(is);
480
481 KASSERT(is->is_terminating, ("is_terminating == false"));
482
483 #ifdef ICL_KERNEL_PROXY
484 if (is->is_login_pdu != NULL) {
485 icl_pdu_free(is->is_login_pdu);
486 is->is_login_pdu = NULL;
487 }
488 cv_signal(&is->is_login_cv);
489 #endif
490
491 iscsi_session_cleanup(is, true);
492
493 KASSERT(TAILQ_EMPTY(&is->is_outstanding),
494 ("destroying session with active tasks"));
495 KASSERT(STAILQ_EMPTY(&is->is_postponed),
496 ("destroying session with postponed PDUs"));
497
498 ISCSI_SESSION_UNLOCK(is);
499
500 icl_conn_free(is->is_conn);
501 mtx_destroy(&is->is_lock);
502 cv_destroy(&is->is_maintenance_cv);
503 #ifdef ICL_KERNEL_PROXY
504 cv_destroy(&is->is_login_cv);
505 #endif
506
507 ISCSI_SESSION_DEBUG(is, "terminated");
508 free(is, M_ISCSI);
509
510 /*
511 * The iscsi_unload() routine might be waiting.
512 */
513 cv_signal(&sc->sc_cv);
514 }
515
516 static void
iscsi_maintenance_thread(void * arg)517 iscsi_maintenance_thread(void *arg)
518 {
519 struct iscsi_session *is = arg;
520
521 ISCSI_SESSION_LOCK(is);
522 for (;;) {
523 if (is->is_reconnecting == false &&
524 is->is_terminating == false &&
525 (STAILQ_EMPTY(&is->is_postponed) ||
526 ISCSI_SNGT(is->is_cmdsn, is->is_maxcmdsn)))
527 cv_wait(&is->is_maintenance_cv, &is->is_lock);
528
529 /* Terminate supersedes reconnect. */
530 if (is->is_terminating) {
531 ISCSI_SESSION_UNLOCK(is);
532 iscsi_maintenance_thread_terminate(is);
533 kthread_exit();
534 return;
535 }
536
537 if (is->is_reconnecting) {
538 ISCSI_SESSION_UNLOCK(is);
539 iscsi_maintenance_thread_reconnect(is);
540 ISCSI_SESSION_LOCK(is);
541 continue;
542 }
543
544 iscsi_session_send_postponed(is);
545 }
546 ISCSI_SESSION_UNLOCK(is);
547 }
548
549 static void
iscsi_session_reconnect(struct iscsi_session * is)550 iscsi_session_reconnect(struct iscsi_session *is)
551 {
552
553 /*
554 * XXX: We can't use locking here, because
555 * it's being called from various contexts.
556 * Hope it doesn't break anything.
557 */
558 if (is->is_reconnecting)
559 return;
560
561 is->is_reconnecting = true;
562 cv_signal(&is->is_maintenance_cv);
563 }
564
565 static void
iscsi_session_terminate(struct iscsi_session * is)566 iscsi_session_terminate(struct iscsi_session *is)
567 {
568
569 if (is->is_terminating)
570 return;
571
572 is->is_terminating = true;
573
574 #if 0
575 iscsi_session_logout(is);
576 #endif
577 cv_signal(&is->is_maintenance_cv);
578 }
579
580 static void
iscsi_callout(void * context)581 iscsi_callout(void *context)
582 {
583 struct icl_pdu *request;
584 struct iscsi_bhs_nop_out *bhsno;
585 struct iscsi_session *is;
586 bool reconnect_needed = false;
587 sbintime_t sbt, pr;
588
589 is = context;
590
591 ISCSI_SESSION_LOCK(is);
592 if (is->is_terminating) {
593 ISCSI_SESSION_UNLOCK(is);
594 return;
595 }
596
597 sbt = mstosbt(995);
598 pr = mstosbt(10);
599 callout_schedule_sbt(&is->is_callout, sbt, pr, 0);
600
601 if (is->is_conf.isc_enable == 0)
602 goto out;
603
604 is->is_timeout++;
605
606 if (is->is_waiting_for_iscsid) {
607 if (iscsid_timeout > 0 && is->is_timeout > iscsid_timeout) {
608 ISCSI_SESSION_WARN(is, "timed out waiting for iscsid(8) "
609 "for %d seconds; reconnecting",
610 is->is_timeout);
611 reconnect_needed = true;
612 }
613 goto out;
614 }
615
616 if (is->is_login_phase) {
617 if (is->is_login_timeout > 0 && is->is_timeout > is->is_login_timeout) {
618 ISCSI_SESSION_WARN(is, "login timed out after %d seconds; "
619 "reconnecting", is->is_timeout);
620 reconnect_needed = true;
621 }
622 goto out;
623 }
624
625 if (is->is_ping_timeout <= 0) {
626 /*
627 * Pings are disabled. Don't send NOP-Out in this case.
628 * Reset the timeout, to avoid triggering reconnection,
629 * should the user decide to reenable them.
630 */
631 is->is_timeout = 0;
632 goto out;
633 }
634
635 if (is->is_timeout >= is->is_ping_timeout) {
636 ISCSI_SESSION_WARN(is, "no ping reply (NOP-In) after %d seconds; "
637 "reconnecting", is->is_ping_timeout);
638 reconnect_needed = true;
639 goto out;
640 }
641
642 ISCSI_SESSION_UNLOCK(is);
643
644 /*
645 * If the ping was reset less than one second ago - which means
646 * that we've received some PDU during the last second - assume
647 * the traffic flows correctly and don't bother sending a NOP-Out.
648 *
649 * (It's 2 - one for one second, and one for incrementing is_timeout
650 * earlier in this routine.)
651 */
652 if (is->is_timeout < 2)
653 return;
654
655 request = icl_pdu_new(is->is_conn, M_NOWAIT);
656 if (request == NULL) {
657 ISCSI_SESSION_WARN(is, "failed to allocate PDU");
658 return;
659 }
660 bhsno = (struct iscsi_bhs_nop_out *)request->ip_bhs;
661 bhsno->bhsno_opcode = ISCSI_BHS_OPCODE_NOP_OUT |
662 ISCSI_BHS_OPCODE_IMMEDIATE;
663 bhsno->bhsno_flags = 0x80;
664 bhsno->bhsno_target_transfer_tag = 0xffffffff;
665 iscsi_pdu_queue(request);
666 return;
667
668 out:
669 if (is->is_terminating) {
670 ISCSI_SESSION_UNLOCK(is);
671 return;
672 }
673
674 ISCSI_SESSION_UNLOCK(is);
675
676 if (reconnect_needed)
677 iscsi_session_reconnect(is);
678 }
679
680 static void
iscsi_pdu_update_statsn(const struct icl_pdu * response)681 iscsi_pdu_update_statsn(const struct icl_pdu *response)
682 {
683 const struct iscsi_bhs_data_in *bhsdi;
684 struct iscsi_session *is;
685 uint32_t expcmdsn, maxcmdsn, statsn;
686
687 is = PDU_SESSION(response);
688
689 ISCSI_SESSION_LOCK_ASSERT(is);
690
691 /*
692 * We're only using fields common for all the response
693 * (target -> initiator) PDUs.
694 */
695 bhsdi = (const struct iscsi_bhs_data_in *)response->ip_bhs;
696 /*
697 * Ok, I lied. In case of Data-In, "The fields StatSN, Status,
698 * and Residual Count only have meaningful content if the S bit
699 * is set to 1", so we also need to check the bit specific for
700 * Data-In PDU.
701 */
702 if (bhsdi->bhsdi_opcode != ISCSI_BHS_OPCODE_SCSI_DATA_IN ||
703 (bhsdi->bhsdi_flags & BHSDI_FLAGS_S) != 0) {
704 statsn = ntohl(bhsdi->bhsdi_statsn);
705 if (statsn != is->is_statsn && statsn != (is->is_statsn + 1)) {
706 /* XXX: This is normal situation for MCS */
707 ISCSI_SESSION_WARN(is, "PDU 0x%x StatSN %u != "
708 "session ExpStatSN %u (or + 1); reconnecting",
709 bhsdi->bhsdi_opcode, statsn, is->is_statsn);
710 iscsi_session_reconnect(is);
711 }
712 if (ISCSI_SNGT(statsn, is->is_statsn))
713 is->is_statsn = statsn;
714 }
715
716 expcmdsn = ntohl(bhsdi->bhsdi_expcmdsn);
717 maxcmdsn = ntohl(bhsdi->bhsdi_maxcmdsn);
718
719 if (ISCSI_SNLT(maxcmdsn + 1, expcmdsn)) {
720 ISCSI_SESSION_DEBUG(is,
721 "PDU MaxCmdSN %u + 1 < PDU ExpCmdSN %u; ignoring",
722 maxcmdsn, expcmdsn);
723 } else {
724 if (ISCSI_SNGT(maxcmdsn, is->is_maxcmdsn)) {
725 is->is_maxcmdsn = maxcmdsn;
726
727 /*
728 * Command window increased; kick the maintanance thread
729 * to send out postponed commands.
730 */
731 if (!STAILQ_EMPTY(&is->is_postponed))
732 cv_signal(&is->is_maintenance_cv);
733 } else if (ISCSI_SNLT(maxcmdsn, is->is_maxcmdsn)) {
734 /* XXX: This is normal situation for MCS */
735 ISCSI_SESSION_DEBUG(is,
736 "PDU MaxCmdSN %u < session MaxCmdSN %u; ignoring",
737 maxcmdsn, is->is_maxcmdsn);
738 }
739
740 if (ISCSI_SNGT(expcmdsn, is->is_expcmdsn)) {
741 is->is_expcmdsn = expcmdsn;
742 } else if (ISCSI_SNLT(expcmdsn, is->is_expcmdsn)) {
743 /* XXX: This is normal situation for MCS */
744 ISCSI_SESSION_DEBUG(is,
745 "PDU ExpCmdSN %u < session ExpCmdSN %u; ignoring",
746 expcmdsn, is->is_expcmdsn);
747 }
748 }
749
750 /*
751 * Every incoming PDU - not just NOP-In - resets the ping timer.
752 * The purpose of the timeout is to reset the connection when it stalls;
753 * we don't want this to happen when NOP-In or NOP-Out ends up delayed
754 * in some queue.
755 */
756 is->is_timeout = 0;
757 }
758
759 static void
iscsi_receive_callback(struct icl_pdu * response)760 iscsi_receive_callback(struct icl_pdu *response)
761 {
762 struct iscsi_session *is;
763
764 is = PDU_SESSION(response);
765
766 ISCSI_SESSION_LOCK(is);
767
768 iscsi_pdu_update_statsn(response);
769
770 #ifdef ICL_KERNEL_PROXY
771 if (is->is_login_phase) {
772 if (is->is_login_pdu == NULL)
773 is->is_login_pdu = response;
774 else
775 icl_pdu_free(response);
776 ISCSI_SESSION_UNLOCK(is);
777 cv_signal(&is->is_login_cv);
778 return;
779 }
780 #endif
781
782 /*
783 * The handling routine is responsible for freeing the PDU
784 * when it's no longer needed.
785 */
786 switch (response->ip_bhs->bhs_opcode) {
787 case ISCSI_BHS_OPCODE_NOP_IN:
788 iscsi_pdu_handle_nop_in(response);
789 ISCSI_SESSION_UNLOCK(is);
790 break;
791 case ISCSI_BHS_OPCODE_SCSI_RESPONSE:
792 iscsi_pdu_handle_scsi_response(response);
793 /* Session lock dropped inside. */
794 ISCSI_SESSION_LOCK_ASSERT_NOT(is);
795 break;
796 case ISCSI_BHS_OPCODE_TASK_RESPONSE:
797 iscsi_pdu_handle_task_response(response);
798 ISCSI_SESSION_UNLOCK(is);
799 break;
800 case ISCSI_BHS_OPCODE_SCSI_DATA_IN:
801 iscsi_pdu_handle_data_in(response);
802 /* Session lock dropped inside. */
803 ISCSI_SESSION_LOCK_ASSERT_NOT(is);
804 break;
805 case ISCSI_BHS_OPCODE_LOGOUT_RESPONSE:
806 iscsi_pdu_handle_logout_response(response);
807 ISCSI_SESSION_UNLOCK(is);
808 break;
809 case ISCSI_BHS_OPCODE_R2T:
810 iscsi_pdu_handle_r2t(response);
811 ISCSI_SESSION_UNLOCK(is);
812 break;
813 case ISCSI_BHS_OPCODE_ASYNC_MESSAGE:
814 iscsi_pdu_handle_async_message(response);
815 ISCSI_SESSION_UNLOCK(is);
816 break;
817 case ISCSI_BHS_OPCODE_REJECT:
818 iscsi_pdu_handle_reject(response);
819 ISCSI_SESSION_UNLOCK(is);
820 break;
821 default:
822 ISCSI_SESSION_WARN(is, "received PDU with unsupported "
823 "opcode 0x%x; reconnecting",
824 response->ip_bhs->bhs_opcode);
825 iscsi_session_reconnect(is);
826 ISCSI_SESSION_UNLOCK(is);
827 icl_pdu_free(response);
828 }
829 }
830
831 static void
iscsi_error_callback(struct icl_conn * ic)832 iscsi_error_callback(struct icl_conn *ic)
833 {
834 struct iscsi_session *is;
835
836 is = CONN_SESSION(ic);
837
838 ISCSI_SESSION_WARN(is, "connection error; reconnecting");
839 iscsi_session_reconnect(is);
840 }
841
842 static void
iscsi_pdu_handle_nop_in(struct icl_pdu * response)843 iscsi_pdu_handle_nop_in(struct icl_pdu *response)
844 {
845 struct iscsi_session *is;
846 struct iscsi_bhs_nop_out *bhsno;
847 struct iscsi_bhs_nop_in *bhsni;
848 struct icl_pdu *request;
849 void *data = NULL;
850 size_t datasize;
851 int error;
852
853 is = PDU_SESSION(response);
854 bhsni = (struct iscsi_bhs_nop_in *)response->ip_bhs;
855
856 if (bhsni->bhsni_target_transfer_tag == 0xffffffff) {
857 /*
858 * Nothing to do; iscsi_pdu_update_statsn() already
859 * zeroed the timeout.
860 */
861 icl_pdu_free(response);
862 return;
863 }
864
865 datasize = icl_pdu_data_segment_length(response);
866 if (datasize > 0) {
867 data = malloc(datasize, M_ISCSI, M_NOWAIT | M_ZERO);
868 if (data == NULL) {
869 ISCSI_SESSION_WARN(is, "failed to allocate memory; "
870 "reconnecting");
871 icl_pdu_free(response);
872 iscsi_session_reconnect(is);
873 return;
874 }
875 icl_pdu_get_data(response, 0, data, datasize);
876 }
877
878 request = icl_pdu_new(response->ip_conn, M_NOWAIT);
879 if (request == NULL) {
880 ISCSI_SESSION_WARN(is, "failed to allocate memory; "
881 "reconnecting");
882 free(data, M_ISCSI);
883 icl_pdu_free(response);
884 iscsi_session_reconnect(is);
885 return;
886 }
887 bhsno = (struct iscsi_bhs_nop_out *)request->ip_bhs;
888 bhsno->bhsno_opcode = ISCSI_BHS_OPCODE_NOP_OUT |
889 ISCSI_BHS_OPCODE_IMMEDIATE;
890 bhsno->bhsno_flags = 0x80;
891 bhsno->bhsno_initiator_task_tag = 0xffffffff;
892 bhsno->bhsno_target_transfer_tag = bhsni->bhsni_target_transfer_tag;
893 if (datasize > 0) {
894 error = icl_pdu_append_data(request, data, datasize, M_NOWAIT);
895 if (error != 0) {
896 ISCSI_SESSION_WARN(is, "failed to allocate memory; "
897 "reconnecting");
898 free(data, M_ISCSI);
899 icl_pdu_free(request);
900 icl_pdu_free(response);
901 iscsi_session_reconnect(is);
902 return;
903 }
904 free(data, M_ISCSI);
905 }
906
907 icl_pdu_free(response);
908 iscsi_pdu_queue_locked(request);
909 }
910
911 static void
iscsi_pdu_handle_scsi_response(struct icl_pdu * response)912 iscsi_pdu_handle_scsi_response(struct icl_pdu *response)
913 {
914 struct iscsi_bhs_scsi_response *bhssr;
915 struct iscsi_outstanding *io;
916 struct iscsi_session *is;
917 union ccb *ccb;
918 struct ccb_scsiio *csio;
919 size_t data_segment_len, received;
920 uint16_t sense_len;
921 uint32_t resid;
922
923 is = PDU_SESSION(response);
924
925 bhssr = (struct iscsi_bhs_scsi_response *)response->ip_bhs;
926 io = iscsi_outstanding_find(is, bhssr->bhssr_initiator_task_tag);
927 if (io == NULL || io->io_ccb == NULL) {
928 ISCSI_SESSION_WARN(is, "bad itt 0x%x", bhssr->bhssr_initiator_task_tag);
929 icl_pdu_free(response);
930 iscsi_session_reconnect(is);
931 ISCSI_SESSION_UNLOCK(is);
932 return;
933 }
934
935 ccb = io->io_ccb;
936 if (bhssr->bhssr_response == BHSSR_RESPONSE_COMMAND_COMPLETED) {
937 if (ntohl(bhssr->bhssr_expdatasn) != io->io_datasn) {
938 ISCSI_SESSION_WARN(is,
939 "ExpDataSN mismatch in SCSI Response (%u vs %u)",
940 ntohl(bhssr->bhssr_expdatasn), io->io_datasn);
941
942 /*
943 * XXX: Permit an ExpDataSN of zero for errors.
944 *
945 * This doesn't conform to RFC 7143, but some
946 * targets seem to do this.
947 */
948 if (bhssr->bhssr_status != 0 &&
949 bhssr->bhssr_expdatasn == htonl(0))
950 goto skip_expdatasn;
951
952 icl_pdu_free(response);
953 iscsi_session_reconnect(is);
954 ISCSI_SESSION_UNLOCK(is);
955 return;
956 }
957 } else {
958 if (bhssr->bhssr_expdatasn != htonl(0)) {
959 ISCSI_SESSION_WARN(is,
960 "ExpDataSN mismatch in SCSI Response (%u vs 0)",
961 ntohl(bhssr->bhssr_expdatasn));
962 icl_pdu_free(response);
963 iscsi_session_reconnect(is);
964 ISCSI_SESSION_UNLOCK(is);
965 return;
966 }
967 }
968 skip_expdatasn:
969
970 /*
971 * With iSER, after getting good response we can be sure
972 * that all the data has been successfully transferred.
973 */
974 if (is->is_conn->ic_iser) {
975 resid = ntohl(bhssr->bhssr_residual_count);
976 if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_UNDERFLOW) {
977 io->io_received = ccb->csio.dxfer_len - resid;
978 } else if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_OVERFLOW) {
979 ISCSI_SESSION_WARN(is, "overflow: target indicates %d", resid);
980 } else {
981 io->io_received = ccb->csio.dxfer_len;
982 }
983 }
984
985 received = io->io_received;
986 iscsi_outstanding_remove(is, io);
987 ISCSI_SESSION_UNLOCK(is);
988
989 if (bhssr->bhssr_response != BHSSR_RESPONSE_COMMAND_COMPLETED) {
990 ISCSI_SESSION_WARN(is, "service response 0x%x", bhssr->bhssr_response);
991 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
992 xpt_freeze_devq(ccb->ccb_h.path, 1);
993 ISCSI_SESSION_DEBUG(is, "freezing devq");
994 }
995 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN;
996 } else if (bhssr->bhssr_status == 0) {
997 ccb->ccb_h.status = CAM_REQ_CMP;
998 } else {
999 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
1000 xpt_freeze_devq(ccb->ccb_h.path, 1);
1001 ISCSI_SESSION_DEBUG(is, "freezing devq");
1002 }
1003 ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR | CAM_DEV_QFRZN;
1004 ccb->csio.scsi_status = bhssr->bhssr_status;
1005 }
1006
1007 csio = &ccb->csio;
1008 data_segment_len = icl_pdu_data_segment_length(response);
1009 if (data_segment_len > 0) {
1010 if (data_segment_len < sizeof(sense_len)) {
1011 ISCSI_SESSION_WARN(is, "truncated data segment (%zd bytes)",
1012 data_segment_len);
1013 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
1014 xpt_freeze_devq(ccb->ccb_h.path, 1);
1015 ISCSI_SESSION_DEBUG(is, "freezing devq");
1016 }
1017 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN;
1018 goto out;
1019 }
1020 icl_pdu_get_data(response, 0, &sense_len, sizeof(sense_len));
1021 sense_len = ntohs(sense_len);
1022 #if 0
1023 ISCSI_SESSION_DEBUG(is, "sense_len %d, data len %zd",
1024 sense_len, data_segment_len);
1025 #endif
1026 if (sizeof(sense_len) + sense_len > data_segment_len) {
1027 ISCSI_SESSION_WARN(is, "truncated data segment "
1028 "(%zd bytes, should be %zd)",
1029 data_segment_len, sizeof(sense_len) + sense_len);
1030 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
1031 xpt_freeze_devq(ccb->ccb_h.path, 1);
1032 ISCSI_SESSION_DEBUG(is, "freezing devq");
1033 }
1034 ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN;
1035 goto out;
1036 } else if (sizeof(sense_len) + sense_len < data_segment_len)
1037 ISCSI_SESSION_WARN(is, "oversize data segment "
1038 "(%zd bytes, should be %zd)",
1039 data_segment_len, sizeof(sense_len) + sense_len);
1040 if (sense_len > csio->sense_len) {
1041 ISCSI_SESSION_DEBUG(is, "truncating sense from %d to %d",
1042 sense_len, csio->sense_len);
1043 sense_len = csio->sense_len;
1044 }
1045 icl_pdu_get_data(response, sizeof(sense_len), &csio->sense_data, sense_len);
1046 csio->sense_resid = csio->sense_len - sense_len;
1047 ccb->ccb_h.status |= CAM_AUTOSNS_VALID;
1048 }
1049
1050 out:
1051 if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_UNDERFLOW)
1052 csio->resid = ntohl(bhssr->bhssr_residual_count);
1053
1054 if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) {
1055 KASSERT(received <= csio->dxfer_len,
1056 ("received > csio->dxfer_len"));
1057 if (received < csio->dxfer_len) {
1058 if (csio->resid != csio->dxfer_len - received) {
1059 ISCSI_SESSION_WARN(is, "underflow mismatch: "
1060 "target indicates %d, we calculated %zd",
1061 csio->resid, csio->dxfer_len - received);
1062 }
1063 csio->resid = csio->dxfer_len - received;
1064 }
1065 }
1066
1067 xpt_done(ccb);
1068 icl_pdu_free(response);
1069 }
1070
1071 static void
iscsi_pdu_handle_task_response(struct icl_pdu * response)1072 iscsi_pdu_handle_task_response(struct icl_pdu *response)
1073 {
1074 struct iscsi_bhs_task_management_response *bhstmr;
1075 struct iscsi_outstanding *io, *aio;
1076 struct iscsi_session *is;
1077
1078 is = PDU_SESSION(response);
1079
1080 bhstmr = (struct iscsi_bhs_task_management_response *)response->ip_bhs;
1081 io = iscsi_outstanding_find(is, bhstmr->bhstmr_initiator_task_tag);
1082 if (io == NULL || io->io_ccb != NULL) {
1083 ISCSI_SESSION_WARN(is, "bad itt 0x%x",
1084 bhstmr->bhstmr_initiator_task_tag);
1085 icl_pdu_free(response);
1086 iscsi_session_reconnect(is);
1087 return;
1088 }
1089
1090 if (bhstmr->bhstmr_response != BHSTMR_RESPONSE_FUNCTION_COMPLETE) {
1091 ISCSI_SESSION_WARN(is, "task response 0x%x",
1092 bhstmr->bhstmr_response);
1093 } else {
1094 aio = iscsi_outstanding_find(is, io->io_referenced_task_tag);
1095 if (aio != NULL && aio->io_ccb != NULL)
1096 iscsi_session_terminate_task(is, aio, CAM_REQ_ABORTED);
1097 }
1098
1099 iscsi_outstanding_remove(is, io);
1100 icl_pdu_free(response);
1101 }
1102
1103 static void
iscsi_pdu_get_data_csio(struct icl_pdu * response,size_t pdu_offset,struct ccb_scsiio * csio,size_t oreceived,size_t data_segment_len)1104 iscsi_pdu_get_data_csio(struct icl_pdu *response, size_t pdu_offset,
1105 struct ccb_scsiio *csio, size_t oreceived, size_t data_segment_len)
1106 {
1107 switch (csio->ccb_h.flags & CAM_DATA_MASK) {
1108 case CAM_DATA_BIO:
1109 icl_pdu_get_bio(response, pdu_offset,
1110 (struct bio *)csio->data_ptr, oreceived, data_segment_len);
1111 break;
1112 case CAM_DATA_VADDR:
1113 icl_pdu_get_data(response, pdu_offset,
1114 csio->data_ptr + oreceived, data_segment_len);
1115 break;
1116 default:
1117 __assert_unreachable();
1118 }
1119 }
1120
1121 static void
iscsi_pdu_handle_data_in(struct icl_pdu * response)1122 iscsi_pdu_handle_data_in(struct icl_pdu *response)
1123 {
1124 struct iscsi_bhs_data_in *bhsdi;
1125 struct iscsi_outstanding *io;
1126 struct iscsi_session *is;
1127 union ccb *ccb;
1128 struct ccb_scsiio *csio;
1129 size_t data_segment_len, received, oreceived;
1130
1131 is = PDU_SESSION(response);
1132 bhsdi = (struct iscsi_bhs_data_in *)response->ip_bhs;
1133 io = iscsi_outstanding_find(is, bhsdi->bhsdi_initiator_task_tag);
1134 if (io == NULL || io->io_ccb == NULL) {
1135 ISCSI_SESSION_WARN(is, "bad itt 0x%x", bhsdi->bhsdi_initiator_task_tag);
1136 icl_pdu_free(response);
1137 iscsi_session_reconnect(is);
1138 ISCSI_SESSION_UNLOCK(is);
1139 return;
1140 }
1141
1142 if (io->io_datasn != ntohl(bhsdi->bhsdi_datasn)) {
1143 ISCSI_SESSION_WARN(is, "received Data-In PDU with "
1144 "DataSN %u, while expected %u; dropping connection",
1145 ntohl(bhsdi->bhsdi_datasn), io->io_datasn);
1146 icl_pdu_free(response);
1147 iscsi_session_reconnect(is);
1148 ISCSI_SESSION_UNLOCK(is);
1149 return;
1150 }
1151 io->io_datasn += response->ip_additional_pdus + 1;
1152
1153 data_segment_len = icl_pdu_data_segment_length(response);
1154 if (data_segment_len == 0) {
1155 /*
1156 * "The sending of 0 length data segments should be avoided,
1157 * but initiators and targets MUST be able to properly receive
1158 * 0 length data segments."
1159 */
1160 ISCSI_SESSION_UNLOCK(is);
1161 icl_pdu_free(response);
1162 return;
1163 }
1164
1165 /*
1166 * We need to track this for security reasons - without it, malicious target
1167 * could respond to SCSI READ without sending Data-In PDUs, which would result
1168 * in read operation on the initiator side returning random kernel data.
1169 */
1170 if (ntohl(bhsdi->bhsdi_buffer_offset) != io->io_received) {
1171 ISCSI_SESSION_WARN(is, "data out of order; expected offset %zd, got %zd",
1172 io->io_received, (size_t)ntohl(bhsdi->bhsdi_buffer_offset));
1173 icl_pdu_free(response);
1174 iscsi_session_reconnect(is);
1175 ISCSI_SESSION_UNLOCK(is);
1176 return;
1177 }
1178
1179 ccb = io->io_ccb;
1180 csio = &ccb->csio;
1181
1182 if (io->io_received + data_segment_len > csio->dxfer_len) {
1183 ISCSI_SESSION_WARN(is, "oversize data segment (%zd bytes "
1184 "at offset %zd, buffer is %d)",
1185 data_segment_len, io->io_received, csio->dxfer_len);
1186 icl_pdu_free(response);
1187 iscsi_session_reconnect(is);
1188 ISCSI_SESSION_UNLOCK(is);
1189 return;
1190 }
1191
1192 oreceived = io->io_received;
1193 io->io_received += data_segment_len;
1194 received = io->io_received;
1195 if ((bhsdi->bhsdi_flags & BHSDI_FLAGS_S) != 0)
1196 iscsi_outstanding_remove(is, io);
1197 ISCSI_SESSION_UNLOCK(is);
1198
1199 iscsi_pdu_get_data_csio(response, 0, csio, oreceived, data_segment_len);
1200
1201 /*
1202 * XXX: Check F.
1203 */
1204 if ((bhsdi->bhsdi_flags & BHSDI_FLAGS_S) == 0) {
1205 /*
1206 * Nothing more to do.
1207 */
1208 icl_pdu_free(response);
1209 return;
1210 }
1211
1212 //ISCSI_SESSION_DEBUG(is, "got S flag; status 0x%x", bhsdi->bhsdi_status);
1213 if (bhsdi->bhsdi_status == 0) {
1214 ccb->ccb_h.status = CAM_REQ_CMP;
1215 } else {
1216 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
1217 xpt_freeze_devq(ccb->ccb_h.path, 1);
1218 ISCSI_SESSION_DEBUG(is, "freezing devq");
1219 }
1220 ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR | CAM_DEV_QFRZN;
1221 csio->scsi_status = bhsdi->bhsdi_status;
1222 }
1223
1224 if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) {
1225 KASSERT(received <= csio->dxfer_len,
1226 ("received > csio->dxfer_len"));
1227 if (received < csio->dxfer_len) {
1228 csio->resid = ntohl(bhsdi->bhsdi_residual_count);
1229 if (csio->resid != csio->dxfer_len - received) {
1230 ISCSI_SESSION_WARN(is, "underflow mismatch: "
1231 "target indicates %d, we calculated %zd",
1232 csio->resid, csio->dxfer_len - received);
1233 }
1234 csio->resid = csio->dxfer_len - received;
1235 }
1236 }
1237
1238 xpt_done(ccb);
1239 icl_pdu_free(response);
1240 }
1241
1242 static void
iscsi_pdu_handle_logout_response(struct icl_pdu * response)1243 iscsi_pdu_handle_logout_response(struct icl_pdu *response)
1244 {
1245
1246 ISCSI_SESSION_DEBUG(PDU_SESSION(response), "logout response");
1247 icl_pdu_free(response);
1248 }
1249
1250 static int
iscsi_pdu_append_data_csio(struct icl_pdu * request,struct ccb_scsiio * csio,size_t off,size_t len,int how)1251 iscsi_pdu_append_data_csio(struct icl_pdu *request, struct ccb_scsiio *csio,
1252 size_t off, size_t len, int how)
1253 {
1254 switch (csio->ccb_h.flags & CAM_DATA_MASK) {
1255 case CAM_DATA_BIO:
1256 return (icl_pdu_append_bio(request,
1257 (struct bio *)csio->data_ptr, off, len, how));
1258 case CAM_DATA_VADDR:
1259 return (icl_pdu_append_data(request, csio->data_ptr + off, len,
1260 how));
1261 default:
1262 __assert_unreachable();
1263 }
1264 }
1265
1266 static void
iscsi_pdu_handle_r2t(struct icl_pdu * response)1267 iscsi_pdu_handle_r2t(struct icl_pdu *response)
1268 {
1269 struct icl_pdu *request;
1270 struct iscsi_session *is;
1271 struct iscsi_bhs_r2t *bhsr2t;
1272 struct iscsi_bhs_data_out *bhsdo;
1273 struct iscsi_outstanding *io;
1274 struct ccb_scsiio *csio;
1275 size_t off, len, max_send_data_segment_length, total_len;
1276 int error;
1277 uint32_t datasn = 0;
1278
1279 is = PDU_SESSION(response);
1280
1281 bhsr2t = (struct iscsi_bhs_r2t *)response->ip_bhs;
1282 io = iscsi_outstanding_find(is, bhsr2t->bhsr2t_initiator_task_tag);
1283 if (io == NULL || io->io_ccb == NULL) {
1284 ISCSI_SESSION_WARN(is, "bad itt 0x%x; reconnecting",
1285 bhsr2t->bhsr2t_initiator_task_tag);
1286 icl_pdu_free(response);
1287 iscsi_session_reconnect(is);
1288 return;
1289 }
1290
1291 csio = &io->io_ccb->csio;
1292
1293 if ((csio->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_OUT) {
1294 ISCSI_SESSION_WARN(is, "received R2T for read command; reconnecting");
1295 icl_pdu_free(response);
1296 iscsi_session_reconnect(is);
1297 return;
1298 }
1299
1300 /*
1301 * XXX: Verify R2TSN.
1302 */
1303
1304 off = ntohl(bhsr2t->bhsr2t_buffer_offset);
1305 if (off > csio->dxfer_len) {
1306 ISCSI_SESSION_WARN(is, "target requested invalid offset "
1307 "%zd, buffer is %d; reconnecting", off, csio->dxfer_len);
1308 icl_pdu_free(response);
1309 iscsi_session_reconnect(is);
1310 return;
1311 }
1312
1313 total_len = ntohl(bhsr2t->bhsr2t_desired_data_transfer_length);
1314 if (total_len == 0 || total_len > csio->dxfer_len) {
1315 ISCSI_SESSION_WARN(is, "target requested invalid length "
1316 "%zd, buffer is %d; reconnecting", total_len, csio->dxfer_len);
1317 icl_pdu_free(response);
1318 iscsi_session_reconnect(is);
1319 return;
1320 }
1321
1322 //ISCSI_SESSION_DEBUG(is, "r2t; off %zd, len %zd", off, total_len);
1323
1324 if (is->is_conn->ic_hw_isomax != 0)
1325 max_send_data_segment_length = is->is_conn->ic_hw_isomax;
1326 else
1327 max_send_data_segment_length =
1328 is->is_conn->ic_max_send_data_segment_length;
1329 for (;;) {
1330 len = total_len;
1331
1332 if (len > max_send_data_segment_length)
1333 len = max_send_data_segment_length;
1334
1335 if (off + len > csio->dxfer_len) {
1336 ISCSI_SESSION_WARN(is, "target requested invalid "
1337 "length/offset %zd, buffer is %d; reconnecting",
1338 off + len, csio->dxfer_len);
1339 icl_pdu_free(response);
1340 iscsi_session_reconnect(is);
1341 return;
1342 }
1343
1344 request = icl_pdu_new(response->ip_conn, M_NOWAIT);
1345 if (request == NULL) {
1346 icl_pdu_free(response);
1347 iscsi_session_reconnect(is);
1348 return;
1349 }
1350
1351 bhsdo = (struct iscsi_bhs_data_out *)request->ip_bhs;
1352 bhsdo->bhsdo_opcode = ISCSI_BHS_OPCODE_SCSI_DATA_OUT;
1353 bhsdo->bhsdo_lun = bhsr2t->bhsr2t_lun;
1354 bhsdo->bhsdo_initiator_task_tag =
1355 bhsr2t->bhsr2t_initiator_task_tag;
1356 bhsdo->bhsdo_target_transfer_tag =
1357 bhsr2t->bhsr2t_target_transfer_tag;
1358 bhsdo->bhsdo_datasn = htonl(datasn);
1359 bhsdo->bhsdo_buffer_offset = htonl(off);
1360 error = iscsi_pdu_append_data_csio(request, csio, off, len,
1361 M_NOWAIT | ICL_NOCOPY);
1362 if (error != 0) {
1363 ISCSI_SESSION_WARN(is, "failed to allocate memory; "
1364 "reconnecting");
1365 icl_pdu_free(request);
1366 icl_pdu_free(response);
1367 iscsi_session_reconnect(is);
1368 return;
1369 }
1370
1371 datasn += howmany(len,
1372 is->is_conn->ic_max_send_data_segment_length);
1373 off += len;
1374 total_len -= len;
1375
1376 if (total_len == 0) {
1377 bhsdo->bhsdo_flags |= BHSDO_FLAGS_F;
1378 //ISCSI_SESSION_DEBUG(is, "setting F, off %zd", off);
1379 } else {
1380 //ISCSI_SESSION_DEBUG(is, "not finished, off %zd", off);
1381 }
1382
1383 iscsi_pdu_queue_locked(request);
1384
1385 if (total_len == 0)
1386 break;
1387 }
1388
1389 icl_pdu_free(response);
1390 }
1391
1392 static void
iscsi_pdu_handle_async_message(struct icl_pdu * response)1393 iscsi_pdu_handle_async_message(struct icl_pdu *response)
1394 {
1395 struct iscsi_bhs_asynchronous_message *bhsam;
1396 struct iscsi_session *is;
1397
1398 is = PDU_SESSION(response);
1399 bhsam = (struct iscsi_bhs_asynchronous_message *)response->ip_bhs;
1400 switch (bhsam->bhsam_async_event) {
1401 case BHSAM_EVENT_TARGET_REQUESTS_LOGOUT:
1402 ISCSI_SESSION_WARN(is, "target requests logout; removing session");
1403 iscsi_session_logout(is);
1404 iscsi_session_terminate(is);
1405 break;
1406 case BHSAM_EVENT_TARGET_TERMINATES_CONNECTION:
1407 ISCSI_SESSION_WARN(is, "target indicates it will drop the connection");
1408 break;
1409 case BHSAM_EVENT_TARGET_TERMINATES_SESSION:
1410 ISCSI_SESSION_WARN(is, "target indicates it will drop the session");
1411 break;
1412 default:
1413 /*
1414 * XXX: Technically, we're obligated to also handle
1415 * parameter renegotiation.
1416 */
1417 ISCSI_SESSION_WARN(is, "ignoring AsyncEvent %d", bhsam->bhsam_async_event);
1418 break;
1419 }
1420
1421 icl_pdu_free(response);
1422 }
1423
1424 static void
iscsi_pdu_handle_reject(struct icl_pdu * response)1425 iscsi_pdu_handle_reject(struct icl_pdu *response)
1426 {
1427 struct iscsi_bhs_reject *bhsr;
1428 struct iscsi_session *is;
1429
1430 is = PDU_SESSION(response);
1431 bhsr = (struct iscsi_bhs_reject *)response->ip_bhs;
1432 ISCSI_SESSION_WARN(is, "received Reject PDU, reason 0x%x; protocol error?",
1433 bhsr->bhsr_reason);
1434
1435 icl_pdu_free(response);
1436 }
1437
1438 static int
iscsi_ioctl_daemon_wait(struct iscsi_softc * sc,struct iscsi_daemon_request * request,bool freebsd13)1439 iscsi_ioctl_daemon_wait(struct iscsi_softc *sc,
1440 struct iscsi_daemon_request *request, bool freebsd13)
1441 {
1442 struct iscsi_session *is;
1443 int error;
1444
1445 sx_slock(&sc->sc_lock);
1446 for (;;) {
1447 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1448 ISCSI_SESSION_LOCK(is);
1449 if (is->is_conf.isc_enable == 0 &&
1450 is->is_conf.isc_discovery == 0) {
1451 ISCSI_SESSION_UNLOCK(is);
1452 continue;
1453 }
1454 if (is->is_waiting_for_iscsid)
1455 break;
1456 ISCSI_SESSION_UNLOCK(is);
1457 }
1458
1459 if (is == NULL) {
1460 if (sc->sc_unloading) {
1461 sx_sunlock(&sc->sc_lock);
1462 return (ENXIO);
1463 }
1464
1465 /*
1466 * No session requires attention from iscsid(8); wait.
1467 */
1468 error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock);
1469 if (error != 0) {
1470 sx_sunlock(&sc->sc_lock);
1471 return (error);
1472 }
1473 continue;
1474 }
1475
1476 is->is_waiting_for_iscsid = false;
1477 is->is_login_phase = true;
1478 is->is_reason[0] = '\0';
1479 ISCSI_SESSION_UNLOCK(is);
1480
1481 request->idr_session_id = is->is_id;
1482 memcpy(&request->idr_isid, &is->is_isid,
1483 sizeof(request->idr_isid));
1484 request->idr_tsih = 0; /* New or reinstated session. */
1485 memcpy(&request->idr_conf, &is->is_conf,
1486 sizeof(request->idr_conf));
1487
1488 #ifdef COMPAT_FREEBSD13
1489 if (freebsd13) {
1490 struct icl_drv_limits idl;
1491 struct iscsi_daemon_request13 *request13;
1492
1493 error = icl_limits(is->is_conf.isc_offload,
1494 is->is_conf.isc_iser, 0, &idl);
1495 if (error != 0) {
1496 ISCSI_SESSION_WARN(is, "icl_limits for "
1497 "offload \"%s\" failed with error %d",
1498 is->is_conf.isc_offload, error);
1499 sx_sunlock(&sc->sc_lock);
1500 return (error);
1501 }
1502 request13 = (struct iscsi_daemon_request13 *)request;
1503 request13->idr_limits.isl_max_recv_data_segment_length =
1504 idl.idl_max_recv_data_segment_length;
1505 request13->idr_limits.isl_max_send_data_segment_length =
1506 idl.idl_max_send_data_segment_length;
1507 request13->idr_limits.isl_max_burst_length =
1508 idl.idl_max_burst_length;
1509 request13->idr_limits.isl_first_burst_length =
1510 idl.idl_first_burst_length;
1511 }
1512 #endif
1513 sx_sunlock(&sc->sc_lock);
1514 return (0);
1515 }
1516 }
1517
1518 static int
iscsi_ioctl_daemon_limits(struct iscsi_softc * sc,struct iscsi_daemon_limits * limits)1519 iscsi_ioctl_daemon_limits(struct iscsi_softc *sc,
1520 struct iscsi_daemon_limits *limits)
1521 {
1522 struct icl_drv_limits idl;
1523 struct iscsi_session *is;
1524 int error;
1525
1526 sx_slock(&sc->sc_lock);
1527
1528 /*
1529 * Find the session to fetch limits for.
1530 */
1531 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1532 if (is->is_id == limits->idl_session_id)
1533 break;
1534 }
1535 if (is == NULL) {
1536 sx_sunlock(&sc->sc_lock);
1537 return (ESRCH);
1538 }
1539
1540 error = icl_limits(is->is_conf.isc_offload, is->is_conf.isc_iser,
1541 limits->idl_socket, &idl);
1542 sx_sunlock(&sc->sc_lock);
1543 if (error != 0) {
1544 ISCSI_SESSION_WARN(is, "icl_limits for offload \"%s\" "
1545 "failed with error %d", is->is_conf.isc_offload, error);
1546 return (error);
1547 }
1548 limits->idl_limits.isl_max_recv_data_segment_length =
1549 idl.idl_max_recv_data_segment_length;
1550 limits->idl_limits.isl_max_send_data_segment_length =
1551 idl.idl_max_send_data_segment_length;
1552 limits->idl_limits.isl_max_burst_length =
1553 idl.idl_max_burst_length;
1554 limits->idl_limits.isl_first_burst_length =
1555 idl.idl_first_burst_length;
1556
1557 return (0);
1558 }
1559
1560 static int
iscsi_ioctl_daemon_handoff(struct iscsi_softc * sc,struct iscsi_daemon_handoff * handoff)1561 iscsi_ioctl_daemon_handoff(struct iscsi_softc *sc,
1562 struct iscsi_daemon_handoff *handoff)
1563 {
1564 struct iscsi_session *is;
1565 struct icl_conn *ic;
1566 int error;
1567
1568 sx_slock(&sc->sc_lock);
1569
1570 /*
1571 * Find the session to hand off socket to.
1572 */
1573 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1574 if (is->is_id == handoff->idh_session_id)
1575 break;
1576 }
1577 if (is == NULL) {
1578 sx_sunlock(&sc->sc_lock);
1579 return (ESRCH);
1580 }
1581 ISCSI_SESSION_LOCK(is);
1582 ic = is->is_conn;
1583 if (is->is_conf.isc_discovery || is->is_terminating) {
1584 ISCSI_SESSION_UNLOCK(is);
1585 sx_sunlock(&sc->sc_lock);
1586 return (EINVAL);
1587 }
1588 if (is->is_connected) {
1589 /*
1590 * This might have happened because another iscsid(8)
1591 * instance handed off the connection in the meantime.
1592 * Just return.
1593 */
1594 ISCSI_SESSION_WARN(is, "handoff on already connected "
1595 "session");
1596 ISCSI_SESSION_UNLOCK(is);
1597 sx_sunlock(&sc->sc_lock);
1598 return (EBUSY);
1599 }
1600
1601 strlcpy(is->is_target_alias, handoff->idh_target_alias,
1602 sizeof(is->is_target_alias));
1603 is->is_tsih = handoff->idh_tsih;
1604 is->is_statsn = handoff->idh_statsn;
1605 is->is_protocol_level = handoff->idh_protocol_level;
1606 is->is_initial_r2t = handoff->idh_initial_r2t;
1607 is->is_immediate_data = handoff->idh_immediate_data;
1608
1609 ic->ic_max_recv_data_segment_length =
1610 handoff->idh_max_recv_data_segment_length;
1611 ic->ic_max_send_data_segment_length =
1612 handoff->idh_max_send_data_segment_length;
1613 is->is_max_burst_length = handoff->idh_max_burst_length;
1614 is->is_first_burst_length = handoff->idh_first_burst_length;
1615
1616 if (handoff->idh_header_digest == ISCSI_DIGEST_CRC32C)
1617 ic->ic_header_crc32c = true;
1618 else
1619 ic->ic_header_crc32c = false;
1620 if (handoff->idh_data_digest == ISCSI_DIGEST_CRC32C)
1621 ic->ic_data_crc32c = true;
1622 else
1623 ic->ic_data_crc32c = false;
1624 ic->ic_maxtags = maxtags;
1625
1626 is->is_cmdsn = 0;
1627 is->is_expcmdsn = 0;
1628 is->is_maxcmdsn = 0;
1629 is->is_waiting_for_iscsid = false;
1630 is->is_login_phase = false;
1631 is->is_timeout = 0;
1632 is->is_ping_timeout = is->is_conf.isc_ping_timeout;
1633 if (is->is_ping_timeout < 0)
1634 is->is_ping_timeout = ping_timeout;
1635 is->is_login_timeout = is->is_conf.isc_login_timeout;
1636 if (is->is_login_timeout < 0)
1637 is->is_login_timeout = login_timeout;
1638 is->is_connected = true;
1639 is->is_reason[0] = '\0';
1640
1641 ISCSI_SESSION_UNLOCK(is);
1642
1643 /*
1644 * If we're going through the proxy, the idh_socket will be 0,
1645 * and the ICL module can simply ignore this call. It can also
1646 * use it to determine it's no longer in the Login phase.
1647 */
1648 error = icl_conn_handoff(ic, handoff->idh_socket);
1649 if (error != 0) {
1650 sx_sunlock(&sc->sc_lock);
1651 iscsi_session_terminate(is);
1652 return (error);
1653 }
1654
1655 sx_sunlock(&sc->sc_lock);
1656
1657 if (is->is_sim != NULL) {
1658 /*
1659 * When reconnecting, there already is SIM allocated for the session.
1660 */
1661 KASSERT(is->is_simq_frozen, ("reconnect without frozen simq"));
1662 ISCSI_SESSION_LOCK(is);
1663 ISCSI_SESSION_DEBUG(is, "releasing");
1664 is->is_simq_frozen = false;
1665 xpt_release_simq(is->is_sim, 1);
1666 ISCSI_SESSION_UNLOCK(is);
1667
1668 } else {
1669 ISCSI_SESSION_LOCK(is);
1670 is->is_devq = cam_simq_alloc(ic->ic_maxtags);
1671 if (is->is_devq == NULL) {
1672 ISCSI_SESSION_UNLOCK(is);
1673 ISCSI_SESSION_WARN(is, "failed to allocate simq");
1674 iscsi_session_terminate(is);
1675 return (ENOMEM);
1676 }
1677
1678 is->is_sim = cam_sim_alloc(iscsi_action, NULL, "iscsi",
1679 is, is->is_id /* unit */, &is->is_lock,
1680 1, ic->ic_maxtags, is->is_devq);
1681 if (is->is_sim == NULL) {
1682 ISCSI_SESSION_UNLOCK(is);
1683 ISCSI_SESSION_WARN(is, "failed to allocate SIM");
1684 cam_simq_free(is->is_devq);
1685 iscsi_session_terminate(is);
1686 return (ENOMEM);
1687 }
1688
1689 if (xpt_bus_register(is->is_sim, NULL, 0) != 0) {
1690 ISCSI_SESSION_UNLOCK(is);
1691 ISCSI_SESSION_WARN(is, "failed to register bus");
1692 iscsi_session_terminate(is);
1693 return (ENOMEM);
1694 }
1695
1696 error = xpt_create_path(&is->is_path, /*periph*/NULL,
1697 cam_sim_path(is->is_sim), CAM_TARGET_WILDCARD,
1698 CAM_LUN_WILDCARD);
1699 if (error != CAM_REQ_CMP) {
1700 ISCSI_SESSION_UNLOCK(is);
1701 ISCSI_SESSION_WARN(is, "failed to create path");
1702 iscsi_session_terminate(is);
1703 return (ENOMEM);
1704 }
1705 ISCSI_SESSION_UNLOCK(is);
1706 }
1707
1708 return (0);
1709 }
1710
1711 static int
iscsi_ioctl_daemon_fail(struct iscsi_softc * sc,struct iscsi_daemon_fail * fail)1712 iscsi_ioctl_daemon_fail(struct iscsi_softc *sc,
1713 struct iscsi_daemon_fail *fail)
1714 {
1715 struct iscsi_session *is;
1716
1717 sx_slock(&sc->sc_lock);
1718
1719 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1720 if (is->is_id == fail->idf_session_id)
1721 break;
1722 }
1723 if (is == NULL) {
1724 sx_sunlock(&sc->sc_lock);
1725 return (ESRCH);
1726 }
1727 ISCSI_SESSION_LOCK(is);
1728 ISCSI_SESSION_DEBUG(is, "iscsid(8) failed: %s",
1729 fail->idf_reason);
1730 strlcpy(is->is_reason, fail->idf_reason, sizeof(is->is_reason));
1731 //is->is_waiting_for_iscsid = false;
1732 //is->is_login_phase = true;
1733 //iscsi_session_reconnect(is);
1734 ISCSI_SESSION_UNLOCK(is);
1735 sx_sunlock(&sc->sc_lock);
1736
1737 return (0);
1738 }
1739
1740 #ifdef ICL_KERNEL_PROXY
1741 static int
iscsi_ioctl_daemon_connect(struct iscsi_softc * sc,struct iscsi_daemon_connect * idc)1742 iscsi_ioctl_daemon_connect(struct iscsi_softc *sc,
1743 struct iscsi_daemon_connect *idc)
1744 {
1745 struct iscsi_session *is;
1746 struct sockaddr *from_sa, *to_sa;
1747 int error;
1748
1749 sx_slock(&sc->sc_lock);
1750 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1751 if (is->is_id == idc->idc_session_id)
1752 break;
1753 }
1754 if (is == NULL) {
1755 sx_sunlock(&sc->sc_lock);
1756 return (ESRCH);
1757 }
1758 sx_sunlock(&sc->sc_lock);
1759
1760 if (idc->idc_from_addrlen > 0) {
1761 error = getsockaddr(&from_sa, (void *)idc->idc_from_addr, idc->idc_from_addrlen);
1762 if (error != 0) {
1763 ISCSI_SESSION_WARN(is,
1764 "getsockaddr failed with error %d", error);
1765 return (error);
1766 }
1767 } else {
1768 from_sa = NULL;
1769 }
1770 error = getsockaddr(&to_sa, (void *)idc->idc_to_addr, idc->idc_to_addrlen);
1771 if (error != 0) {
1772 ISCSI_SESSION_WARN(is, "getsockaddr failed with error %d",
1773 error);
1774 free(from_sa, M_SONAME);
1775 return (error);
1776 }
1777
1778 ISCSI_SESSION_LOCK(is);
1779 is->is_statsn = 0;
1780 is->is_cmdsn = 0;
1781 is->is_expcmdsn = 0;
1782 is->is_maxcmdsn = 0;
1783 is->is_waiting_for_iscsid = false;
1784 is->is_login_phase = true;
1785 is->is_timeout = 0;
1786 ISCSI_SESSION_UNLOCK(is);
1787
1788 error = icl_conn_connect(is->is_conn, idc->idc_domain,
1789 idc->idc_socktype, idc->idc_protocol, from_sa, to_sa);
1790 free(from_sa, M_SONAME);
1791 free(to_sa, M_SONAME);
1792
1793 /*
1794 * Digests are always disabled during login phase.
1795 */
1796 is->is_conn->ic_header_crc32c = false;
1797 is->is_conn->ic_data_crc32c = false;
1798
1799 return (error);
1800 }
1801
1802 static int
iscsi_ioctl_daemon_send(struct iscsi_softc * sc,struct iscsi_daemon_send * ids)1803 iscsi_ioctl_daemon_send(struct iscsi_softc *sc,
1804 struct iscsi_daemon_send *ids)
1805 {
1806 struct iscsi_session *is;
1807 struct icl_pdu *ip;
1808 size_t datalen;
1809 void *data;
1810 int error;
1811
1812 sx_slock(&sc->sc_lock);
1813 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1814 if (is->is_id == ids->ids_session_id)
1815 break;
1816 }
1817 if (is == NULL) {
1818 sx_sunlock(&sc->sc_lock);
1819 return (ESRCH);
1820 }
1821 sx_sunlock(&sc->sc_lock);
1822
1823 if (is->is_login_phase == false)
1824 return (EBUSY);
1825
1826 if (is->is_terminating || is->is_reconnecting)
1827 return (EIO);
1828
1829 datalen = ids->ids_data_segment_len;
1830 if (datalen > is->is_conn->ic_max_send_data_segment_length)
1831 return (EINVAL);
1832 if (datalen > 0) {
1833 data = malloc(datalen, M_ISCSI, M_WAITOK);
1834 error = copyin(ids->ids_data_segment, data, datalen);
1835 if (error != 0) {
1836 free(data, M_ISCSI);
1837 return (error);
1838 }
1839 }
1840
1841 ip = icl_pdu_new(is->is_conn, M_WAITOK);
1842 memcpy(ip->ip_bhs, ids->ids_bhs, sizeof(*ip->ip_bhs));
1843 if (datalen > 0) {
1844 error = icl_pdu_append_data(ip, data, datalen, M_WAITOK);
1845 KASSERT(error == 0, ("icl_pdu_append_data(..., M_WAITOK) failed"));
1846 free(data, M_ISCSI);
1847 }
1848 iscsi_pdu_queue(ip);
1849
1850 return (0);
1851 }
1852
1853 static int
iscsi_ioctl_daemon_receive(struct iscsi_softc * sc,struct iscsi_daemon_receive * idr)1854 iscsi_ioctl_daemon_receive(struct iscsi_softc *sc,
1855 struct iscsi_daemon_receive *idr)
1856 {
1857 struct iscsi_session *is;
1858 struct icl_pdu *ip;
1859 void *data;
1860 int error;
1861
1862 sx_slock(&sc->sc_lock);
1863 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
1864 if (is->is_id == idr->idr_session_id)
1865 break;
1866 }
1867 if (is == NULL) {
1868 sx_sunlock(&sc->sc_lock);
1869 return (ESRCH);
1870 }
1871 sx_sunlock(&sc->sc_lock);
1872
1873 if (is->is_login_phase == false)
1874 return (EBUSY);
1875
1876 ISCSI_SESSION_LOCK(is);
1877 while (is->is_login_pdu == NULL &&
1878 is->is_terminating == false &&
1879 is->is_reconnecting == false) {
1880 error = cv_wait_sig(&is->is_login_cv, &is->is_lock);
1881 if (error != 0) {
1882 ISCSI_SESSION_UNLOCK(is);
1883 return (error);
1884 }
1885 }
1886 if (is->is_terminating || is->is_reconnecting) {
1887 ISCSI_SESSION_UNLOCK(is);
1888 return (EIO);
1889 }
1890 ip = is->is_login_pdu;
1891 is->is_login_pdu = NULL;
1892 ISCSI_SESSION_UNLOCK(is);
1893
1894 if (ip->ip_data_len > idr->idr_data_segment_len) {
1895 icl_pdu_free(ip);
1896 return (EMSGSIZE);
1897 }
1898
1899 error = copyout(ip->ip_bhs, idr->idr_bhs, sizeof(*ip->ip_bhs));
1900 if (error == 0 && ip->ip_data_len > 0) {
1901 data = malloc(ip->ip_data_len, M_ISCSI, M_WAITOK);
1902 icl_pdu_get_data(ip, 0, data, ip->ip_data_len);
1903 error = copyout(data, idr->idr_data_segment, ip->ip_data_len);
1904 free(data, M_ISCSI);
1905 }
1906
1907 icl_pdu_free(ip);
1908
1909 return (error);
1910 }
1911 #endif /* ICL_KERNEL_PROXY */
1912
1913 static void
iscsi_sanitize_session_conf(struct iscsi_session_conf * isc)1914 iscsi_sanitize_session_conf(struct iscsi_session_conf *isc)
1915 {
1916 /*
1917 * Just make sure all the fields are null-terminated.
1918 *
1919 * XXX: This is not particularly secure. We should
1920 * create our own conf and then copy in relevant
1921 * fields.
1922 */
1923 isc->isc_initiator[ISCSI_NAME_LEN - 1] = '\0';
1924 isc->isc_initiator_addr[ISCSI_ADDR_LEN - 1] = '\0';
1925 isc->isc_initiator_alias[ISCSI_ALIAS_LEN - 1] = '\0';
1926 isc->isc_target[ISCSI_NAME_LEN - 1] = '\0';
1927 isc->isc_target_addr[ISCSI_ADDR_LEN - 1] = '\0';
1928 isc->isc_user[ISCSI_NAME_LEN - 1] = '\0';
1929 isc->isc_secret[ISCSI_SECRET_LEN - 1] = '\0';
1930 isc->isc_mutual_user[ISCSI_NAME_LEN - 1] = '\0';
1931 isc->isc_mutual_secret[ISCSI_SECRET_LEN - 1] = '\0';
1932 }
1933
1934 static bool
iscsi_valid_session_conf(const struct iscsi_session_conf * isc)1935 iscsi_valid_session_conf(const struct iscsi_session_conf *isc)
1936 {
1937
1938 if (isc->isc_initiator[0] == '\0') {
1939 ISCSI_DEBUG("empty isc_initiator");
1940 return (false);
1941 }
1942
1943 if (isc->isc_target_addr[0] == '\0') {
1944 ISCSI_DEBUG("empty isc_target_addr");
1945 return (false);
1946 }
1947
1948 if (isc->isc_discovery != 0 && isc->isc_target[0] != 0) {
1949 ISCSI_DEBUG("non-empty isc_target for discovery session");
1950 return (false);
1951 }
1952
1953 if (isc->isc_discovery == 0 && isc->isc_target[0] == 0) {
1954 ISCSI_DEBUG("empty isc_target for non-discovery session");
1955 return (false);
1956 }
1957
1958 return (true);
1959 }
1960
1961 static int
iscsi_ioctl_session_add(struct iscsi_softc * sc,struct iscsi_session_add * isa)1962 iscsi_ioctl_session_add(struct iscsi_softc *sc, struct iscsi_session_add *isa)
1963 {
1964 struct iscsi_session *is;
1965 const struct iscsi_session *is2;
1966 int error;
1967 sbintime_t sbt, pr;
1968
1969 iscsi_sanitize_session_conf(&isa->isa_conf);
1970 if (iscsi_valid_session_conf(&isa->isa_conf) == false)
1971 return (EINVAL);
1972
1973 is = malloc(sizeof(*is), M_ISCSI, M_ZERO | M_WAITOK);
1974 memcpy(&is->is_conf, &isa->isa_conf, sizeof(is->is_conf));
1975
1976 sx_xlock(&sc->sc_lock);
1977
1978 /*
1979 * Prevent duplicates.
1980 */
1981 TAILQ_FOREACH(is2, &sc->sc_sessions, is_next) {
1982 if (!!is->is_conf.isc_discovery !=
1983 !!is2->is_conf.isc_discovery)
1984 continue;
1985
1986 if (strcmp(is->is_conf.isc_target_addr,
1987 is2->is_conf.isc_target_addr) != 0)
1988 continue;
1989
1990 if (is->is_conf.isc_discovery == 0 &&
1991 strcmp(is->is_conf.isc_target,
1992 is2->is_conf.isc_target) != 0)
1993 continue;
1994
1995 sx_xunlock(&sc->sc_lock);
1996 free(is, M_ISCSI);
1997 return (EBUSY);
1998 }
1999
2000 is->is_conn = icl_new_conn(is->is_conf.isc_offload,
2001 is->is_conf.isc_iser, "iscsi", &is->is_lock);
2002 if (is->is_conn == NULL) {
2003 sx_xunlock(&sc->sc_lock);
2004 free(is, M_ISCSI);
2005 return (EINVAL);
2006 }
2007 is->is_conn->ic_receive = iscsi_receive_callback;
2008 is->is_conn->ic_error = iscsi_error_callback;
2009 is->is_conn->ic_prv0 = is;
2010 TAILQ_INIT(&is->is_outstanding);
2011 STAILQ_INIT(&is->is_postponed);
2012 mtx_init(&is->is_lock, "iscsi_lock", NULL, MTX_DEF);
2013 cv_init(&is->is_maintenance_cv, "iscsi_mt");
2014 #ifdef ICL_KERNEL_PROXY
2015 cv_init(&is->is_login_cv, "iscsi_login");
2016 #endif
2017
2018 /*
2019 * Set some default values, from RFC 3720, section 12.
2020 *
2021 * These values are updated by the handoff IOCTL, but are
2022 * needed prior to the handoff to support sending the ISER
2023 * login PDU.
2024 */
2025 is->is_conn->ic_max_recv_data_segment_length = 8192;
2026 is->is_conn->ic_max_send_data_segment_length = 8192;
2027 is->is_max_burst_length = 262144;
2028 is->is_first_burst_length = 65536;
2029
2030 is->is_softc = sc;
2031 sc->sc_last_session_id++;
2032 is->is_id = sc->sc_last_session_id;
2033 is->is_isid[0] = 0x80; /* RFC 3720, 10.12.5: 10b, "Random" ISID. */
2034 arc4rand(&is->is_isid[1], 5, 0);
2035 is->is_tsih = 0;
2036 callout_init(&is->is_callout, 1);
2037
2038 error = kthread_add(iscsi_maintenance_thread, is, NULL, NULL, 0, 0, "iscsimt");
2039 if (error != 0) {
2040 ISCSI_SESSION_WARN(is, "kthread_add(9) failed with error %d", error);
2041 sx_xunlock(&sc->sc_lock);
2042 return (error);
2043 }
2044 is->is_ping_timeout = is->is_conf.isc_ping_timeout;
2045 if (is->is_ping_timeout < 0)
2046 is->is_ping_timeout = ping_timeout;
2047 is->is_login_timeout = is->is_conf.isc_login_timeout;
2048 if (is->is_login_timeout < 0)
2049 is->is_login_timeout = login_timeout;
2050
2051 sbt = mstosbt(995);
2052 pr = mstosbt(10);
2053 callout_reset_sbt(&is->is_callout, sbt, pr, iscsi_callout, is, 0);
2054 TAILQ_INSERT_TAIL(&sc->sc_sessions, is, is_next);
2055
2056 ISCSI_SESSION_LOCK(is);
2057 /*
2058 * Don't notify iscsid(8) if the session is disabled and it's not
2059 * a discovery session,
2060 */
2061 if (is->is_conf.isc_enable == 0 && is->is_conf.isc_discovery == 0) {
2062 ISCSI_SESSION_UNLOCK(is);
2063 sx_xunlock(&sc->sc_lock);
2064 return (0);
2065 }
2066
2067 is->is_waiting_for_iscsid = true;
2068 strlcpy(is->is_reason, "Waiting for iscsid(8)", sizeof(is->is_reason));
2069 ISCSI_SESSION_UNLOCK(is);
2070 cv_signal(&sc->sc_cv);
2071 sx_xunlock(&sc->sc_lock);
2072 return (0);
2073 }
2074
2075 static bool
iscsi_session_conf_matches(unsigned int id1,const struct iscsi_session_conf * c1,unsigned int id2,const struct iscsi_session_conf * c2)2076 iscsi_session_conf_matches(unsigned int id1, const struct iscsi_session_conf *c1,
2077 unsigned int id2, const struct iscsi_session_conf *c2)
2078 {
2079
2080 if (id2 != 0 && id2 != id1)
2081 return (false);
2082 if (c2->isc_target[0] != '\0' &&
2083 strcmp(c1->isc_target, c2->isc_target) != 0)
2084 return (false);
2085 if (c2->isc_target_addr[0] != '\0' &&
2086 strcmp(c1->isc_target_addr, c2->isc_target_addr) != 0)
2087 return (false);
2088 return (true);
2089 }
2090
2091 static int
iscsi_ioctl_session_remove(struct iscsi_softc * sc,struct iscsi_session_remove * isr)2092 iscsi_ioctl_session_remove(struct iscsi_softc *sc,
2093 struct iscsi_session_remove *isr)
2094 {
2095 struct iscsi_session *is, *tmp;
2096 bool found = false;
2097
2098 iscsi_sanitize_session_conf(&isr->isr_conf);
2099
2100 sx_xlock(&sc->sc_lock);
2101 TAILQ_FOREACH_SAFE(is, &sc->sc_sessions, is_next, tmp) {
2102 ISCSI_SESSION_LOCK(is);
2103 if (iscsi_session_conf_matches(is->is_id, &is->is_conf,
2104 isr->isr_session_id, &isr->isr_conf)) {
2105 found = true;
2106 iscsi_session_logout(is);
2107 iscsi_session_terminate(is);
2108 }
2109 ISCSI_SESSION_UNLOCK(is);
2110 }
2111 sx_xunlock(&sc->sc_lock);
2112
2113 if (!found)
2114 return (ESRCH);
2115
2116 return (0);
2117 }
2118
2119 static int
iscsi_ioctl_session_list(struct iscsi_softc * sc,struct iscsi_session_list * isl)2120 iscsi_ioctl_session_list(struct iscsi_softc *sc, struct iscsi_session_list *isl)
2121 {
2122 int error;
2123 unsigned int i = 0;
2124 struct iscsi_session *is;
2125 struct iscsi_session_state iss;
2126
2127 sx_slock(&sc->sc_lock);
2128 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
2129 if (i >= isl->isl_nentries) {
2130 sx_sunlock(&sc->sc_lock);
2131 return (EMSGSIZE);
2132 }
2133 memset(&iss, 0, sizeof(iss));
2134 memcpy(&iss.iss_conf, &is->is_conf, sizeof(iss.iss_conf));
2135 iss.iss_id = is->is_id;
2136 strlcpy(iss.iss_target_alias, is->is_target_alias, sizeof(iss.iss_target_alias));
2137 strlcpy(iss.iss_reason, is->is_reason, sizeof(iss.iss_reason));
2138 strlcpy(iss.iss_offload, is->is_conn->ic_offload, sizeof(iss.iss_offload));
2139
2140 if (is->is_conn->ic_header_crc32c)
2141 iss.iss_header_digest = ISCSI_DIGEST_CRC32C;
2142 else
2143 iss.iss_header_digest = ISCSI_DIGEST_NONE;
2144
2145 if (is->is_conn->ic_data_crc32c)
2146 iss.iss_data_digest = ISCSI_DIGEST_CRC32C;
2147 else
2148 iss.iss_data_digest = ISCSI_DIGEST_NONE;
2149
2150 iss.iss_max_send_data_segment_length =
2151 is->is_conn->ic_max_send_data_segment_length;
2152 iss.iss_max_recv_data_segment_length =
2153 is->is_conn->ic_max_recv_data_segment_length;
2154 iss.iss_max_burst_length = is->is_max_burst_length;
2155 iss.iss_first_burst_length = is->is_first_burst_length;
2156 iss.iss_immediate_data = is->is_immediate_data;
2157 iss.iss_connected = is->is_connected;
2158
2159 error = copyout(&iss, isl->isl_pstates + i, sizeof(iss));
2160 if (error != 0) {
2161 sx_sunlock(&sc->sc_lock);
2162 return (error);
2163 }
2164 i++;
2165 }
2166 sx_sunlock(&sc->sc_lock);
2167
2168 isl->isl_nentries = i;
2169
2170 return (0);
2171 }
2172
2173 static int
iscsi_ioctl_session_modify(struct iscsi_softc * sc,struct iscsi_session_modify * ism)2174 iscsi_ioctl_session_modify(struct iscsi_softc *sc,
2175 struct iscsi_session_modify *ism)
2176 {
2177 struct iscsi_session *is;
2178 const struct iscsi_session *is2;
2179
2180 iscsi_sanitize_session_conf(&ism->ism_conf);
2181 if (iscsi_valid_session_conf(&ism->ism_conf) == false)
2182 return (EINVAL);
2183
2184 sx_xlock(&sc->sc_lock);
2185 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
2186 ISCSI_SESSION_LOCK(is);
2187 if (is->is_id == ism->ism_session_id) {
2188 /* Note that the session remains locked. */
2189 break;
2190 }
2191 ISCSI_SESSION_UNLOCK(is);
2192 }
2193 if (is == NULL) {
2194 sx_xunlock(&sc->sc_lock);
2195 return (ESRCH);
2196 }
2197
2198 /*
2199 * Prevent duplicates.
2200 */
2201 TAILQ_FOREACH(is2, &sc->sc_sessions, is_next) {
2202 if (is == is2)
2203 continue;
2204
2205 if (!!ism->ism_conf.isc_discovery !=
2206 !!is2->is_conf.isc_discovery)
2207 continue;
2208
2209 if (strcmp(ism->ism_conf.isc_target_addr,
2210 is2->is_conf.isc_target_addr) != 0)
2211 continue;
2212
2213 if (ism->ism_conf.isc_discovery == 0 &&
2214 strcmp(ism->ism_conf.isc_target,
2215 is2->is_conf.isc_target) != 0)
2216 continue;
2217
2218 ISCSI_SESSION_UNLOCK(is);
2219 sx_xunlock(&sc->sc_lock);
2220 return (EBUSY);
2221 }
2222
2223 sx_xunlock(&sc->sc_lock);
2224
2225 memcpy(&is->is_conf, &ism->ism_conf, sizeof(is->is_conf));
2226 ISCSI_SESSION_UNLOCK(is);
2227
2228 iscsi_session_reconnect(is);
2229
2230 return (0);
2231 }
2232
2233 static int
iscsi_ioctl(struct cdev * dev,u_long cmd,caddr_t arg,int mode,struct thread * td)2234 iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, int mode,
2235 struct thread *td)
2236 {
2237 struct iscsi_softc *sc;
2238
2239 sc = dev->si_drv1;
2240
2241 switch (cmd) {
2242 case ISCSIDWAIT:
2243 return (iscsi_ioctl_daemon_wait(sc,
2244 (struct iscsi_daemon_request *)arg, false));
2245 #ifdef COMPAT_FREEBSD13
2246 case ISCSIDWAIT13:
2247 return (iscsi_ioctl_daemon_wait(sc,
2248 (struct iscsi_daemon_request *)arg, true));
2249 #endif
2250 case ISCSIDLIMITS:
2251 return (iscsi_ioctl_daemon_limits(sc,
2252 (struct iscsi_daemon_limits *)arg));
2253 case ISCSIDHANDOFF:
2254 return (iscsi_ioctl_daemon_handoff(sc,
2255 (struct iscsi_daemon_handoff *)arg));
2256 case ISCSIDFAIL:
2257 return (iscsi_ioctl_daemon_fail(sc,
2258 (struct iscsi_daemon_fail *)arg));
2259 #ifdef ICL_KERNEL_PROXY
2260 case ISCSIDCONNECT:
2261 return (iscsi_ioctl_daemon_connect(sc,
2262 (struct iscsi_daemon_connect *)arg));
2263 case ISCSIDSEND:
2264 return (iscsi_ioctl_daemon_send(sc,
2265 (struct iscsi_daemon_send *)arg));
2266 case ISCSIDRECEIVE:
2267 return (iscsi_ioctl_daemon_receive(sc,
2268 (struct iscsi_daemon_receive *)arg));
2269 #endif /* ICL_KERNEL_PROXY */
2270 case ISCSISADD:
2271 return (iscsi_ioctl_session_add(sc,
2272 (struct iscsi_session_add *)arg));
2273 case ISCSISREMOVE:
2274 return (iscsi_ioctl_session_remove(sc,
2275 (struct iscsi_session_remove *)arg));
2276 case ISCSISLIST:
2277 return (iscsi_ioctl_session_list(sc,
2278 (struct iscsi_session_list *)arg));
2279 case ISCSISMODIFY:
2280 return (iscsi_ioctl_session_modify(sc,
2281 (struct iscsi_session_modify *)arg));
2282 default:
2283 return (EINVAL);
2284 }
2285 }
2286
2287 static struct iscsi_outstanding *
iscsi_outstanding_find(struct iscsi_session * is,uint32_t initiator_task_tag)2288 iscsi_outstanding_find(struct iscsi_session *is, uint32_t initiator_task_tag)
2289 {
2290 struct iscsi_outstanding *io;
2291
2292 ISCSI_SESSION_LOCK_ASSERT(is);
2293
2294 TAILQ_FOREACH(io, &is->is_outstanding, io_next) {
2295 if (io->io_initiator_task_tag == initiator_task_tag)
2296 return (io);
2297 }
2298 return (NULL);
2299 }
2300
2301 static struct iscsi_outstanding *
iscsi_outstanding_find_ccb(struct iscsi_session * is,union ccb * ccb)2302 iscsi_outstanding_find_ccb(struct iscsi_session *is, union ccb *ccb)
2303 {
2304 struct iscsi_outstanding *io;
2305
2306 ISCSI_SESSION_LOCK_ASSERT(is);
2307
2308 TAILQ_FOREACH(io, &is->is_outstanding, io_next) {
2309 if (io->io_ccb == ccb)
2310 return (io);
2311 }
2312 return (NULL);
2313 }
2314
2315 static struct iscsi_outstanding *
iscsi_outstanding_add(struct iscsi_session * is,struct icl_pdu * request,union ccb * ccb,uint32_t * initiator_task_tagp)2316 iscsi_outstanding_add(struct iscsi_session *is, struct icl_pdu *request,
2317 union ccb *ccb, uint32_t *initiator_task_tagp)
2318 {
2319 struct iscsi_outstanding *io;
2320 int error;
2321
2322 ISCSI_SESSION_LOCK_ASSERT(is);
2323
2324 io = uma_zalloc(iscsi_outstanding_zone, M_NOWAIT | M_ZERO);
2325 if (io == NULL) {
2326 ISCSI_SESSION_WARN(is, "failed to allocate %zd bytes",
2327 sizeof(*io));
2328 return (NULL);
2329 }
2330
2331 error = icl_conn_task_setup(is->is_conn, request, &ccb->csio,
2332 initiator_task_tagp, &io->io_icl_prv);
2333 if (error != 0) {
2334 ISCSI_SESSION_WARN(is,
2335 "icl_conn_task_setup() failed with error %d", error);
2336 uma_zfree(iscsi_outstanding_zone, io);
2337 return (NULL);
2338 }
2339
2340 KASSERT(iscsi_outstanding_find(is, *initiator_task_tagp) == NULL,
2341 ("initiator_task_tag 0x%x already added", *initiator_task_tagp));
2342
2343 io->io_initiator_task_tag = *initiator_task_tagp;
2344 io->io_ccb = ccb;
2345 TAILQ_INSERT_TAIL(&is->is_outstanding, io, io_next);
2346 return (io);
2347 }
2348
2349 static void
iscsi_outstanding_remove(struct iscsi_session * is,struct iscsi_outstanding * io)2350 iscsi_outstanding_remove(struct iscsi_session *is, struct iscsi_outstanding *io)
2351 {
2352
2353 ISCSI_SESSION_LOCK_ASSERT(is);
2354
2355 icl_conn_task_done(is->is_conn, io->io_icl_prv);
2356 TAILQ_REMOVE(&is->is_outstanding, io, io_next);
2357 uma_zfree(iscsi_outstanding_zone, io);
2358 }
2359
2360 static void
iscsi_action_abort(struct iscsi_session * is,union ccb * ccb)2361 iscsi_action_abort(struct iscsi_session *is, union ccb *ccb)
2362 {
2363 struct icl_pdu *request;
2364 struct iscsi_bhs_task_management_request *bhstmr;
2365 struct ccb_abort *cab = &ccb->cab;
2366 struct iscsi_outstanding *io, *aio;
2367 uint32_t initiator_task_tag;
2368
2369 ISCSI_SESSION_LOCK_ASSERT(is);
2370
2371 #if 0
2372 KASSERT(is->is_login_phase == false, ("%s called during Login Phase", __func__));
2373 #else
2374 if (is->is_login_phase) {
2375 ccb->ccb_h.status = CAM_REQ_ABORTED;
2376 xpt_done(ccb);
2377 return;
2378 }
2379 #endif
2380
2381 aio = iscsi_outstanding_find_ccb(is, cab->abort_ccb);
2382 if (aio == NULL) {
2383 ccb->ccb_h.status = CAM_REQ_CMP;
2384 xpt_done(ccb);
2385 return;
2386 }
2387
2388 request = icl_pdu_new(is->is_conn, M_NOWAIT);
2389 if (request == NULL) {
2390 ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
2391 xpt_done(ccb);
2392 return;
2393 }
2394
2395 initiator_task_tag = is->is_initiator_task_tag++;
2396 if (initiator_task_tag == 0xffffffff)
2397 initiator_task_tag = is->is_initiator_task_tag++;
2398
2399 io = iscsi_outstanding_add(is, request, NULL, &initiator_task_tag);
2400 if (io == NULL) {
2401 icl_pdu_free(request);
2402 ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
2403 xpt_done(ccb);
2404 return;
2405 }
2406 io->io_referenced_task_tag = aio->io_initiator_task_tag;
2407
2408 bhstmr = (struct iscsi_bhs_task_management_request *)request->ip_bhs;
2409 bhstmr->bhstmr_opcode = ISCSI_BHS_OPCODE_TASK_REQUEST;
2410 bhstmr->bhstmr_function = 0x80 | BHSTMR_FUNCTION_ABORT_TASK;
2411 bhstmr->bhstmr_lun = htobe64(CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun));
2412 bhstmr->bhstmr_initiator_task_tag = initiator_task_tag;
2413 bhstmr->bhstmr_referenced_task_tag = aio->io_initiator_task_tag;
2414
2415 iscsi_pdu_queue_locked(request);
2416 }
2417
2418 static void
iscsi_action_scsiio(struct iscsi_session * is,union ccb * ccb)2419 iscsi_action_scsiio(struct iscsi_session *is, union ccb *ccb)
2420 {
2421 struct icl_pdu *request;
2422 struct iscsi_bhs_scsi_command *bhssc;
2423 struct ccb_scsiio *csio;
2424 struct iscsi_outstanding *io;
2425 size_t len;
2426 uint32_t initiator_task_tag;
2427 int error;
2428
2429 ISCSI_SESSION_LOCK_ASSERT(is);
2430
2431 #if 0
2432 KASSERT(is->is_login_phase == false, ("%s called during Login Phase", __func__));
2433 #else
2434 if (is->is_login_phase) {
2435 ISCSI_SESSION_DEBUG(is, "called during login phase");
2436 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
2437 xpt_freeze_devq(ccb->ccb_h.path, 1);
2438 ISCSI_SESSION_DEBUG(is, "freezing devq");
2439 }
2440 ccb->ccb_h.status = CAM_REQ_ABORTED | CAM_DEV_QFRZN;
2441 xpt_done(ccb);
2442 return;
2443 }
2444 #endif
2445
2446 request = icl_pdu_new(is->is_conn, M_NOWAIT);
2447 if (request == NULL) {
2448 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
2449 xpt_freeze_devq(ccb->ccb_h.path, 1);
2450 ISCSI_SESSION_DEBUG(is, "freezing devq");
2451 }
2452 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN;
2453 xpt_done(ccb);
2454 return;
2455 }
2456
2457 initiator_task_tag = is->is_initiator_task_tag++;
2458 if (initiator_task_tag == 0xffffffff)
2459 initiator_task_tag = is->is_initiator_task_tag++;
2460
2461 io = iscsi_outstanding_add(is, request, ccb, &initiator_task_tag);
2462 if (io == NULL) {
2463 icl_pdu_free(request);
2464 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
2465 xpt_freeze_devq(ccb->ccb_h.path, 1);
2466 ISCSI_SESSION_DEBUG(is, "freezing devq");
2467 }
2468 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN;
2469 xpt_done(ccb);
2470 return;
2471 }
2472
2473 csio = &ccb->csio;
2474 bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs;
2475 bhssc->bhssc_opcode = ISCSI_BHS_OPCODE_SCSI_COMMAND;
2476 bhssc->bhssc_flags |= BHSSC_FLAGS_F;
2477 switch (csio->ccb_h.flags & CAM_DIR_MASK) {
2478 case CAM_DIR_IN:
2479 bhssc->bhssc_flags |= BHSSC_FLAGS_R;
2480 break;
2481 case CAM_DIR_OUT:
2482 bhssc->bhssc_flags |= BHSSC_FLAGS_W;
2483 break;
2484 }
2485
2486 if ((ccb->ccb_h.flags & CAM_TAG_ACTION_VALID) != 0) {
2487 switch (csio->tag_action) {
2488 case MSG_HEAD_OF_Q_TAG:
2489 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_HOQ;
2490 break;
2491 case MSG_ORDERED_Q_TAG:
2492 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_ORDERED;
2493 break;
2494 case MSG_ACA_TASK:
2495 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_ACA;
2496 break;
2497 case MSG_SIMPLE_Q_TAG:
2498 default:
2499 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_SIMPLE;
2500 break;
2501 }
2502 } else
2503 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_UNTAGGED;
2504
2505 if (is->is_protocol_level >= 2) {
2506 bhssc->bhssc_pri = (csio->priority << BHSSC_PRI_SHIFT) &
2507 BHSSC_PRI_MASK;
2508 }
2509
2510 bhssc->bhssc_lun = htobe64(CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun));
2511 bhssc->bhssc_initiator_task_tag = initiator_task_tag;
2512 bhssc->bhssc_expected_data_transfer_length = htonl(csio->dxfer_len);
2513 KASSERT(csio->cdb_len <= sizeof(bhssc->bhssc_cdb),
2514 ("unsupported CDB size %zd", (size_t)csio->cdb_len));
2515
2516 if (csio->ccb_h.flags & CAM_CDB_POINTER)
2517 memcpy(&bhssc->bhssc_cdb, csio->cdb_io.cdb_ptr, csio->cdb_len);
2518 else
2519 memcpy(&bhssc->bhssc_cdb, csio->cdb_io.cdb_bytes, csio->cdb_len);
2520
2521 if (is->is_immediate_data &&
2522 (csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT) {
2523 len = csio->dxfer_len;
2524 //ISCSI_SESSION_DEBUG(is, "adding %zd of immediate data", len);
2525 if (len > is->is_first_burst_length) {
2526 ISCSI_SESSION_DEBUG(is, "len %zd -> %d", len, is->is_first_burst_length);
2527 len = is->is_first_burst_length;
2528 }
2529 if (len > is->is_conn->ic_max_send_data_segment_length) {
2530 ISCSI_SESSION_DEBUG(is, "len %zd -> %d", len,
2531 is->is_conn->ic_max_send_data_segment_length);
2532 len = is->is_conn->ic_max_send_data_segment_length;
2533 }
2534
2535 error = iscsi_pdu_append_data_csio(request, csio, 0, len,
2536 M_NOWAIT | ICL_NOCOPY);
2537 if (error != 0) {
2538 iscsi_outstanding_remove(is, io);
2539 icl_pdu_free(request);
2540 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
2541 xpt_freeze_devq(ccb->ccb_h.path, 1);
2542 ISCSI_SESSION_DEBUG(is, "freezing devq");
2543 }
2544 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN;
2545 xpt_done(ccb);
2546 return;
2547 }
2548 }
2549 iscsi_pdu_queue_locked(request);
2550 }
2551
2552 static void
iscsi_action(struct cam_sim * sim,union ccb * ccb)2553 iscsi_action(struct cam_sim *sim, union ccb *ccb)
2554 {
2555 struct iscsi_session *is;
2556
2557 is = cam_sim_softc(sim);
2558
2559 ISCSI_SESSION_LOCK_ASSERT(is);
2560
2561 if (is->is_terminating ||
2562 (is->is_connected == false && fail_on_disconnection)) {
2563 ccb->ccb_h.status = CAM_DEV_NOT_THERE;
2564 xpt_done(ccb);
2565 return;
2566 }
2567
2568 /*
2569 * Make sure CAM doesn't sneak in a CCB just after freezing the queue.
2570 */
2571 if (is->is_simq_frozen == true) {
2572 ccb->ccb_h.status &= ~(CAM_SIM_QUEUED | CAM_STATUS_MASK);
2573 ccb->ccb_h.status |= CAM_REQUEUE_REQ;
2574 /* Don't freeze the devq - the SIM queue is already frozen. */
2575 xpt_done(ccb);
2576 return;
2577 }
2578
2579 switch (ccb->ccb_h.func_code) {
2580 case XPT_PATH_INQ:
2581 {
2582 struct ccb_pathinq *cpi = &ccb->cpi;
2583
2584 cpi->version_num = 1;
2585 cpi->hba_inquiry = PI_TAG_ABLE;
2586 cpi->target_sprt = 0;
2587 cpi->hba_misc = PIM_EXTLUNS;
2588 /*
2589 * XXX: It shouldn't ever be NULL; this could be turned
2590 * into a KASSERT eventually.
2591 */
2592 if (is->is_conn == NULL)
2593 ISCSI_WARN("NULL conn");
2594 else if (is->is_conn->ic_unmapped)
2595 cpi->hba_misc |= PIM_UNMAPPED;
2596 cpi->hba_eng_cnt = 0;
2597 cpi->max_target = 0;
2598 /*
2599 * Note that the variable below is only relevant for targets
2600 * that don't claim compliance with anything above SPC2, which
2601 * means they don't support REPORT_LUNS.
2602 */
2603 cpi->max_lun = 255;
2604 cpi->initiator_id = ~0;
2605 strlcpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
2606 strlcpy(cpi->hba_vid, "iSCSI", HBA_IDLEN);
2607 strlcpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN);
2608 cpi->unit_number = cam_sim_unit(sim);
2609 cpi->bus_id = cam_sim_bus(sim);
2610 cpi->base_transfer_speed = 150000; /* XXX */
2611 cpi->transport = XPORT_ISCSI;
2612 cpi->transport_version = 0;
2613 cpi->protocol = PROTO_SCSI;
2614 cpi->protocol_version = SCSI_REV_SPC3;
2615 cpi->maxio = maxphys;
2616 cpi->ccb_h.status = CAM_REQ_CMP;
2617 break;
2618 }
2619 case XPT_GET_TRAN_SETTINGS:
2620 {
2621 struct ccb_trans_settings *cts;
2622 struct ccb_trans_settings_scsi *scsi;
2623
2624 cts = &ccb->cts;
2625 scsi = &cts->proto_specific.scsi;
2626
2627 cts->protocol = PROTO_SCSI;
2628 cts->protocol_version = SCSI_REV_SPC3;
2629 cts->transport = XPORT_ISCSI;
2630 cts->transport_version = 0;
2631 scsi->valid = CTS_SCSI_VALID_TQ;
2632 scsi->flags = CTS_SCSI_FLAGS_TAG_ENB;
2633 cts->ccb_h.status = CAM_REQ_CMP;
2634 break;
2635 }
2636 case XPT_CALC_GEOMETRY:
2637 cam_calc_geometry(&ccb->ccg, /*extended*/1);
2638 ccb->ccb_h.status = CAM_REQ_CMP;
2639 break;
2640 #if 0
2641 /*
2642 * XXX: What's the point?
2643 */
2644 case XPT_RESET_BUS:
2645 case XPT_TERM_IO:
2646 ISCSI_SESSION_DEBUG(is, "faking success for reset, abort, or term_io");
2647 ccb->ccb_h.status = CAM_REQ_CMP;
2648 break;
2649 #endif
2650 case XPT_ABORT:
2651 iscsi_action_abort(is, ccb);
2652 return;
2653 case XPT_SCSI_IO:
2654 iscsi_action_scsiio(is, ccb);
2655 return;
2656 default:
2657 #if 0
2658 ISCSI_SESSION_DEBUG(is, "got unsupported code 0x%x", ccb->ccb_h.func_code);
2659 #endif
2660 ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
2661 break;
2662 }
2663 xpt_done(ccb);
2664 }
2665
2666 static void
iscsi_terminate_sessions(struct iscsi_softc * sc)2667 iscsi_terminate_sessions(struct iscsi_softc *sc)
2668 {
2669 struct iscsi_session *is;
2670
2671 sx_slock(&sc->sc_lock);
2672 TAILQ_FOREACH(is, &sc->sc_sessions, is_next)
2673 iscsi_session_terminate(is);
2674 while(!TAILQ_EMPTY(&sc->sc_sessions)) {
2675 ISCSI_DEBUG("waiting for sessions to terminate");
2676 cv_wait(&sc->sc_cv, &sc->sc_lock);
2677 }
2678 ISCSI_DEBUG("all sessions terminated");
2679 sx_sunlock(&sc->sc_lock);
2680 }
2681
2682 static void
iscsi_shutdown_pre(struct iscsi_softc * sc,int howto)2683 iscsi_shutdown_pre(struct iscsi_softc *sc, int howto)
2684 {
2685 struct iscsi_session *is;
2686
2687 if (!fail_on_shutdown || (howto & RB_NOSYNC) != 0 ||
2688 SCHEDULER_STOPPED())
2689 return;
2690
2691 /*
2692 * If we have any sessions waiting for reconnection, request
2693 * maintenance thread to fail them immediately instead of waiting
2694 * for reconnect timeout.
2695 *
2696 * This prevents LUNs with mounted filesystems that are supported
2697 * by disconnected iSCSI sessions from hanging, however it will
2698 * fail all queued BIOs.
2699 */
2700 ISCSI_DEBUG("forcing failing all disconnected sessions due to shutdown");
2701
2702 fail_on_disconnection = 1;
2703
2704 sx_slock(&sc->sc_lock);
2705 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) {
2706 ISCSI_SESSION_LOCK(is);
2707 if (!is->is_connected) {
2708 ISCSI_SESSION_DEBUG(is, "force failing disconnected session early");
2709 iscsi_session_reconnect(is);
2710 }
2711 ISCSI_SESSION_UNLOCK(is);
2712 }
2713 sx_sunlock(&sc->sc_lock);
2714 }
2715
2716 static void
iscsi_shutdown_post_sync(struct iscsi_softc * sc,int howto)2717 iscsi_shutdown_post_sync(struct iscsi_softc *sc, int howto)
2718 {
2719
2720 if ((howto & RB_NOSYNC) == 0) {
2721 ISCSI_DEBUG("removing all sessions due to shutdown");
2722 iscsi_terminate_sessions(sc);
2723 }
2724 }
2725
2726 static int
iscsi_load(void)2727 iscsi_load(void)
2728 {
2729 int error;
2730
2731 sc = malloc(sizeof(*sc), M_ISCSI, M_ZERO | M_WAITOK);
2732 sx_init(&sc->sc_lock, "iscsi");
2733 TAILQ_INIT(&sc->sc_sessions);
2734 cv_init(&sc->sc_cv, "iscsi_cv");
2735
2736 iscsi_outstanding_zone = uma_zcreate("iscsi_outstanding",
2737 sizeof(struct iscsi_outstanding), NULL, NULL, NULL, NULL,
2738 UMA_ALIGN_PTR, 0);
2739
2740 error = make_dev_p(MAKEDEV_CHECKNAME, &sc->sc_cdev, &iscsi_cdevsw,
2741 NULL, UID_ROOT, GID_WHEEL, 0600, "iscsi");
2742 if (error != 0) {
2743 ISCSI_WARN("failed to create device node, error %d", error);
2744 return (error);
2745 }
2746 sc->sc_cdev->si_drv1 = sc;
2747
2748 sc->sc_shutdown_pre_eh = EVENTHANDLER_REGISTER(shutdown_pre_sync,
2749 iscsi_shutdown_pre, sc, SHUTDOWN_PRI_FIRST);
2750 /*
2751 * shutdown_post_sync needs to run after filesystem shutdown and before
2752 * CAM shutdown - otherwise when rebooting with an iSCSI session that is
2753 * disconnected but has outstanding requests, dashutdown() will hang on
2754 * cam_periph_runccb().
2755 */
2756 sc->sc_shutdown_post_eh = EVENTHANDLER_REGISTER(shutdown_post_sync,
2757 iscsi_shutdown_post_sync, sc, SHUTDOWN_PRI_DEFAULT - 1);
2758
2759 return (0);
2760 }
2761
2762 static int
iscsi_unload(void)2763 iscsi_unload(void)
2764 {
2765
2766 /* Awaken any threads asleep in iscsi_ioctl(). */
2767 sx_xlock(&sc->sc_lock);
2768 sc->sc_unloading = true;
2769 cv_signal(&sc->sc_cv);
2770 sx_xunlock(&sc->sc_lock);
2771
2772 if (sc->sc_cdev != NULL) {
2773 ISCSI_DEBUG("removing device node");
2774 destroy_dev(sc->sc_cdev);
2775 ISCSI_DEBUG("device node removed");
2776 }
2777
2778 if (sc->sc_shutdown_pre_eh != NULL)
2779 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, sc->sc_shutdown_pre_eh);
2780 if (sc->sc_shutdown_post_eh != NULL)
2781 EVENTHANDLER_DEREGISTER(shutdown_post_sync, sc->sc_shutdown_post_eh);
2782
2783 iscsi_terminate_sessions(sc);
2784
2785 uma_zdestroy(iscsi_outstanding_zone);
2786 sx_destroy(&sc->sc_lock);
2787 cv_destroy(&sc->sc_cv);
2788 free(sc, M_ISCSI);
2789 return (0);
2790 }
2791
2792 static int
iscsi_quiesce(void)2793 iscsi_quiesce(void)
2794 {
2795 sx_slock(&sc->sc_lock);
2796 if (!TAILQ_EMPTY(&sc->sc_sessions)) {
2797 sx_sunlock(&sc->sc_lock);
2798 return (EBUSY);
2799 }
2800 sx_sunlock(&sc->sc_lock);
2801 return (0);
2802 }
2803
2804 static int
iscsi_modevent(module_t mod,int what,void * arg)2805 iscsi_modevent(module_t mod, int what, void *arg)
2806 {
2807 int error;
2808
2809 switch (what) {
2810 case MOD_LOAD:
2811 error = iscsi_load();
2812 break;
2813 case MOD_UNLOAD:
2814 error = iscsi_unload();
2815 break;
2816 case MOD_QUIESCE:
2817 error = iscsi_quiesce();
2818 break;
2819 default:
2820 error = EINVAL;
2821 break;
2822 }
2823 return (error);
2824 }
2825
2826 moduledata_t iscsi_data = {
2827 "iscsi",
2828 iscsi_modevent,
2829 0
2830 };
2831
2832 DECLARE_MODULE(iscsi, iscsi_data, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
2833 MODULE_DEPEND(iscsi, cam, 1, 1, 1);
2834 MODULE_DEPEND(iscsi, icl, 1, 1, 1);
2835