projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
iser-target: Fix multi network portal shutdown regression
[deliverable/linux.git] / drivers / target / iscsi / iscsi_target.c
1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19 #include <linux/string.h>
20 #include <linux/kthread.h>
21 #include <linux/crypto.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/idr.h>
25 #include <asm/unaligned.h>
26 #include <scsi/scsi_device.h>
27 #include <scsi/iscsi_proto.h>
28 #include <scsi/scsi_tcq.h>
29 #include <target/target_core_base.h>
30 #include <target/target_core_fabric.h>
31 #include <target/target_core_configfs.h>
32
33 #include "iscsi_target_core.h"
34 #include "iscsi_target_parameters.h"
35 #include "iscsi_target_seq_pdu_list.h"
36 #include "iscsi_target_tq.h"
37 #include "iscsi_target_configfs.h"
38 #include "iscsi_target_datain_values.h"
39 #include "iscsi_target_erl0.h"
40 #include "iscsi_target_erl1.h"
41 #include "iscsi_target_erl2.h"
42 #include "iscsi_target_login.h"
43 #include "iscsi_target_tmr.h"
44 #include "iscsi_target_tpg.h"
45 #include "iscsi_target_util.h"
46 #include "iscsi_target.h"
47 #include "iscsi_target_device.h"
48 #include "iscsi_target_stat.h"
49
50 #include <target/iscsi/iscsi_transport.h>
51
52 static LIST_HEAD(g_tiqn_list);
53 static LIST_HEAD(g_np_list);
54 static DEFINE_SPINLOCK(tiqn_lock);
55 static DEFINE_MUTEX(np_lock);
56
57 static struct idr tiqn_idr;
58 struct idr sess_idr;
59 struct mutex auth_id_lock;
60 spinlock_t sess_idr_lock;
61
62 struct iscsit_global *iscsit_global;
63
64 struct kmem_cache *lio_qr_cache;
65 struct kmem_cache *lio_dr_cache;
66 struct kmem_cache *lio_ooo_cache;
67 struct kmem_cache *lio_r2t_cache;
68
69 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
70 struct iscsi_scsi_req *, u32);
71
72 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
73 {
74 struct iscsi_tiqn *tiqn = NULL;
75
76 spin_lock(&tiqn_lock);
77 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
78 if (!strcmp(tiqn->tiqn, buf)) {
79
80 spin_lock(&tiqn->tiqn_state_lock);
81 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
82 tiqn->tiqn_access_count++;
83 spin_unlock(&tiqn->tiqn_state_lock);
84 spin_unlock(&tiqn_lock);
85 return tiqn;
86 }
87 spin_unlock(&tiqn->tiqn_state_lock);
88 }
89 }
90 spin_unlock(&tiqn_lock);
91
92 return NULL;
93 }
94
95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
96 {
97 spin_lock(&tiqn->tiqn_state_lock);
98 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
99 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
100 spin_unlock(&tiqn->tiqn_state_lock);
101 return 0;
102 }
103 spin_unlock(&tiqn->tiqn_state_lock);
104
105 return -1;
106 }
107
108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
109 {
110 spin_lock(&tiqn->tiqn_state_lock);
111 tiqn->tiqn_access_count--;
112 spin_unlock(&tiqn->tiqn_state_lock);
113 }
114
115 /*
116 * Note that IQN formatting is expected to be done in userspace, and
117 * no explict IQN format checks are done here.
118 */
119 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
120 {
121 struct iscsi_tiqn *tiqn = NULL;
122 int ret;
123
124 if (strlen(buf) >= ISCSI_IQN_LEN) {
125 pr_err("Target IQN exceeds %d bytes\n",
126 ISCSI_IQN_LEN);
127 return ERR_PTR(-EINVAL);
128 }
129
130 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
131 if (!tiqn) {
132 pr_err("Unable to allocate struct iscsi_tiqn\n");
133 return ERR_PTR(-ENOMEM);
134 }
135
136 sprintf(tiqn->tiqn, "%s", buf);
137 INIT_LIST_HEAD(&tiqn->tiqn_list);
138 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
139 spin_lock_init(&tiqn->tiqn_state_lock);
140 spin_lock_init(&tiqn->tiqn_tpg_lock);
141 spin_lock_init(&tiqn->sess_err_stats.lock);
142 spin_lock_init(&tiqn->login_stats.lock);
143 spin_lock_init(&tiqn->logout_stats.lock);
144
145 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
146
147 idr_preload(GFP_KERNEL);
148 spin_lock(&tiqn_lock);
149
150 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
151 if (ret < 0) {
152 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
153 spin_unlock(&tiqn_lock);
154 idr_preload_end();
155 kfree(tiqn);
156 return ERR_PTR(ret);
157 }
158 tiqn->tiqn_index = ret;
159 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
160
161 spin_unlock(&tiqn_lock);
162 idr_preload_end();
163
164 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
165
166 return tiqn;
167
168 }
169
170 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
171 {
172 /*
173 * Wait for accesses to said struct iscsi_tiqn to end.
174 */
175 spin_lock(&tiqn->tiqn_state_lock);
176 while (tiqn->tiqn_access_count != 0) {
177 spin_unlock(&tiqn->tiqn_state_lock);
178 msleep(10);
179 spin_lock(&tiqn->tiqn_state_lock);
180 }
181 spin_unlock(&tiqn->tiqn_state_lock);
182 }
183
184 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
185 {
186 /*
187 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
188 * while holding tiqn->tiqn_state_lock. This means that all subsequent
189 * attempts to access this struct iscsi_tiqn will fail from both transport
190 * fabric and control code paths.
191 */
192 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
193 pr_err("iscsit_set_tiqn_shutdown() failed\n");
194 return;
195 }
196
197 iscsit_wait_for_tiqn(tiqn);
198
199 spin_lock(&tiqn_lock);
200 list_del(&tiqn->tiqn_list);
201 idr_remove(&tiqn_idr, tiqn->tiqn_index);
202 spin_unlock(&tiqn_lock);
203
204 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
205 tiqn->tiqn);
206 kfree(tiqn);
207 }
208
209 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
210 {
211 int ret;
212 /*
213 * Determine if the network portal is accepting storage traffic.
214 */
215 spin_lock_bh(&np->np_thread_lock);
216 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
217 spin_unlock_bh(&np->np_thread_lock);
218 return -1;
219 }
220 spin_unlock_bh(&np->np_thread_lock);
221 /*
222 * Determine if the portal group is accepting storage traffic.
223 */
224 spin_lock_bh(&tpg->tpg_state_lock);
225 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
226 spin_unlock_bh(&tpg->tpg_state_lock);
227 return -1;
228 }
229 spin_unlock_bh(&tpg->tpg_state_lock);
230
231 /*
232 * Here we serialize access across the TIQN+TPG Tuple.
233 */
234 ret = down_interruptible(&tpg->np_login_sem);
235 if ((ret != 0) || signal_pending(current))
236 return -1;
237
238 spin_lock_bh(&tpg->tpg_state_lock);
239 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
240 spin_unlock_bh(&tpg->tpg_state_lock);
241 up(&tpg->np_login_sem);
242 return -1;
243 }
244 spin_unlock_bh(&tpg->tpg_state_lock);
245
246 return 0;
247 }
248
249 void iscsit_login_kref_put(struct kref *kref)
250 {
251 struct iscsi_tpg_np *tpg_np = container_of(kref,
252 struct iscsi_tpg_np, tpg_np_kref);
253
254 complete(&tpg_np->tpg_np_comp);
255 }
256
257 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
258 struct iscsi_tpg_np *tpg_np)
259 {
260 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
261
262 up(&tpg->np_login_sem);
263
264 if (tpg_np)
265 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
266
267 if (tiqn)
268 iscsit_put_tiqn_for_login(tiqn);
269
270 return 0;
271 }
272
273 bool iscsit_check_np_match(
274 struct __kernel_sockaddr_storage *sockaddr,
275 struct iscsi_np *np,
276 int network_transport)
277 {
278 struct sockaddr_in *sock_in, *sock_in_e;
279 struct sockaddr_in6 *sock_in6, *sock_in6_e;
280 bool ip_match = false;
281 u16 port;
282
283 if (sockaddr->ss_family == AF_INET6) {
284 sock_in6 = (struct sockaddr_in6 *)sockaddr;
285 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
286
287 if (!memcmp(&sock_in6->sin6_addr.in6_u,
288 &sock_in6_e->sin6_addr.in6_u,
289 sizeof(struct in6_addr)))
290 ip_match = true;
291
292 port = ntohs(sock_in6->sin6_port);
293 } else {
294 sock_in = (struct sockaddr_in *)sockaddr;
295 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
296
297 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
298 ip_match = true;
299
300 port = ntohs(sock_in->sin_port);
301 }
302
303 if ((ip_match == true) && (np->np_port == port) &&
304 (np->np_network_transport == network_transport))
305 return true;
306
307 return false;
308 }
309
310 /*
311 * Called with mutex np_lock held
312 */
313 static struct iscsi_np *iscsit_get_np(
314 struct __kernel_sockaddr_storage *sockaddr,
315 int network_transport)
316 {
317 struct iscsi_np *np;
318 bool match;
319
320 list_for_each_entry(np, &g_np_list, np_list) {
321 spin_lock_bh(&np->np_thread_lock);
322 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
323 spin_unlock_bh(&np->np_thread_lock);
324 continue;
325 }
326
327 match = iscsit_check_np_match(sockaddr, np, network_transport);
328 if (match == true) {
329 /*
330 * Increment the np_exports reference count now to
331 * prevent iscsit_del_np() below from being called
332 * while iscsi_tpg_add_network_portal() is called.
333 */
334 np->np_exports++;
335 spin_unlock_bh(&np->np_thread_lock);
336 return np;
337 }
338 spin_unlock_bh(&np->np_thread_lock);
339 }
340
341 return NULL;
342 }
343
344 struct iscsi_np *iscsit_add_np(
345 struct __kernel_sockaddr_storage *sockaddr,
346 char *ip_str,
347 int network_transport)
348 {
349 struct sockaddr_in *sock_in;
350 struct sockaddr_in6 *sock_in6;
351 struct iscsi_np *np;
352 int ret;
353
354 mutex_lock(&np_lock);
355
356 /*
357 * Locate the existing struct iscsi_np if already active..
358 */
359 np = iscsit_get_np(sockaddr, network_transport);
360 if (np) {
361 mutex_unlock(&np_lock);
362 return np;
363 }
364
365 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
366 if (!np) {
367 pr_err("Unable to allocate memory for struct iscsi_np\n");
368 mutex_unlock(&np_lock);
369 return ERR_PTR(-ENOMEM);
370 }
371
372 np->np_flags |= NPF_IP_NETWORK;
373 if (sockaddr->ss_family == AF_INET6) {
374 sock_in6 = (struct sockaddr_in6 *)sockaddr;
375 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
376 np->np_port = ntohs(sock_in6->sin6_port);
377 } else {
378 sock_in = (struct sockaddr_in *)sockaddr;
379 sprintf(np->np_ip, "%s", ip_str);
380 np->np_port = ntohs(sock_in->sin_port);
381 }
382
383 np->np_network_transport = network_transport;
384 spin_lock_init(&np->np_thread_lock);
385 init_completion(&np->np_restart_comp);
386 INIT_LIST_HEAD(&np->np_list);
387
388 ret = iscsi_target_setup_login_socket(np, sockaddr);
389 if (ret != 0) {
390 kfree(np);
391 mutex_unlock(&np_lock);
392 return ERR_PTR(ret);
393 }
394
395 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
396 if (IS_ERR(np->np_thread)) {
397 pr_err("Unable to create kthread: iscsi_np\n");
398 ret = PTR_ERR(np->np_thread);
399 kfree(np);
400 mutex_unlock(&np_lock);
401 return ERR_PTR(ret);
402 }
403 /*
404 * Increment the np_exports reference count now to prevent
405 * iscsit_del_np() below from being run while a new call to
406 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
407 * active. We don't need to hold np->np_thread_lock at this
408 * point because iscsi_np has not been added to g_np_list yet.
409 */
410 np->np_exports = 1;
411 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
412
413 list_add_tail(&np->np_list, &g_np_list);
414 mutex_unlock(&np_lock);
415
416 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
417 np->np_ip, np->np_port, np->np_transport->name);
418
419 return np;
420 }
421
422 int iscsit_reset_np_thread(
423 struct iscsi_np *np,
424 struct iscsi_tpg_np *tpg_np,
425 struct iscsi_portal_group *tpg,
426 bool shutdown)
427 {
428 spin_lock_bh(&np->np_thread_lock);
429 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
430 spin_unlock_bh(&np->np_thread_lock);
431 return 0;
432 }
433 np->np_thread_state = ISCSI_NP_THREAD_RESET;
434
435 if (np->np_thread) {
436 spin_unlock_bh(&np->np_thread_lock);
437 send_sig(SIGINT, np->np_thread, 1);
438 wait_for_completion(&np->np_restart_comp);
439 spin_lock_bh(&np->np_thread_lock);
440 }
441 spin_unlock_bh(&np->np_thread_lock);
442
443 if (tpg_np && shutdown) {
444 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
445
446 wait_for_completion(&tpg_np->tpg_np_comp);
447 }
448
449 return 0;
450 }
451
452 static void iscsit_free_np(struct iscsi_np *np)
453 {
454 if (np->np_socket)
455 sock_release(np->np_socket);
456 }
457
458 int iscsit_del_np(struct iscsi_np *np)
459 {
460 spin_lock_bh(&np->np_thread_lock);
461 np->np_exports--;
462 if (np->np_exports) {
463 np->enabled = true;
464 spin_unlock_bh(&np->np_thread_lock);
465 return 0;
466 }
467 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
468 spin_unlock_bh(&np->np_thread_lock);
469
470 if (np->np_thread) {
471 /*
472 * We need to send the signal to wakeup Linux/Net
473 * which may be sleeping in sock_accept()..
474 */
475 send_sig(SIGINT, np->np_thread, 1);
476 kthread_stop(np->np_thread);
477 np->np_thread = NULL;
478 }
479
480 np->np_transport->iscsit_free_np(np);
481
482 mutex_lock(&np_lock);
483 list_del(&np->np_list);
484 mutex_unlock(&np_lock);
485
486 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
487 np->np_ip, np->np_port, np->np_transport->name);
488
489 iscsit_put_transport(np->np_transport);
490 kfree(np);
491 return 0;
492 }
493
494 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
495 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
496
497 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
498 {
499 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
500 return 0;
501 }
502
503 static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
504 {
505 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
506
507 spin_lock_bh(&conn->cmd_lock);
508 if (!list_empty(&cmd->i_conn_node))
509 list_del_init(&cmd->i_conn_node);
510 spin_unlock_bh(&conn->cmd_lock);
511
512 __iscsit_free_cmd(cmd, scsi_cmd, true);
513 }
514
515 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
516 {
517 return TARGET_PROT_NORMAL;
518 }
519
520 static struct iscsit_transport iscsi_target_transport = {
521 .name = "iSCSI/TCP",
522 .transport_type = ISCSI_TCP,
523 .owner = NULL,
524 .iscsit_setup_np = iscsit_setup_np,
525 .iscsit_accept_np = iscsit_accept_np,
526 .iscsit_free_np = iscsit_free_np,
527 .iscsit_get_login_rx = iscsit_get_login_rx,
528 .iscsit_put_login_tx = iscsit_put_login_tx,
529 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
530 .iscsit_immediate_queue = iscsit_immediate_queue,
531 .iscsit_response_queue = iscsit_response_queue,
532 .iscsit_queue_data_in = iscsit_queue_rsp,
533 .iscsit_queue_status = iscsit_queue_rsp,
534 .iscsit_aborted_task = iscsit_aborted_task,
535 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
536 };
537
538 static int __init iscsi_target_init_module(void)
539 {
540 int ret = 0;
541
542 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
543
544 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
545 if (!iscsit_global) {
546 pr_err("Unable to allocate memory for iscsit_global\n");
547 return -1;
548 }
549 mutex_init(&auth_id_lock);
550 spin_lock_init(&sess_idr_lock);
551 idr_init(&tiqn_idr);
552 idr_init(&sess_idr);
553
554 ret = iscsi_target_register_configfs();
555 if (ret < 0)
556 goto out;
557
558 ret = iscsi_thread_set_init();
559 if (ret < 0)
560 goto configfs_out;
561
562 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
563 TARGET_THREAD_SET_COUNT) {
564 pr_err("iscsi_allocate_thread_sets() returned"
565 " unexpected value!\n");
566 goto ts_out1;
567 }
568
569 lio_qr_cache = kmem_cache_create("lio_qr_cache",
570 sizeof(struct iscsi_queue_req),
571 __alignof__(struct iscsi_queue_req), 0, NULL);
572 if (!lio_qr_cache) {
573 pr_err("nable to kmem_cache_create() for"
574 " lio_qr_cache\n");
575 goto ts_out2;
576 }
577
578 lio_dr_cache = kmem_cache_create("lio_dr_cache",
579 sizeof(struct iscsi_datain_req),
580 __alignof__(struct iscsi_datain_req), 0, NULL);
581 if (!lio_dr_cache) {
582 pr_err("Unable to kmem_cache_create() for"
583 " lio_dr_cache\n");
584 goto qr_out;
585 }
586
587 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
588 sizeof(struct iscsi_ooo_cmdsn),
589 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
590 if (!lio_ooo_cache) {
591 pr_err("Unable to kmem_cache_create() for"
592 " lio_ooo_cache\n");
593 goto dr_out;
594 }
595
596 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
597 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
598 0, NULL);
599 if (!lio_r2t_cache) {
600 pr_err("Unable to kmem_cache_create() for"
601 " lio_r2t_cache\n");
602 goto ooo_out;
603 }
604
605 iscsit_register_transport(&iscsi_target_transport);
606
607 if (iscsit_load_discovery_tpg() < 0)
608 goto r2t_out;
609
610 return ret;
611 r2t_out:
612 kmem_cache_destroy(lio_r2t_cache);
613 ooo_out:
614 kmem_cache_destroy(lio_ooo_cache);
615 dr_out:
616 kmem_cache_destroy(lio_dr_cache);
617 qr_out:
618 kmem_cache_destroy(lio_qr_cache);
619 ts_out2:
620 iscsi_deallocate_thread_sets();
621 ts_out1:
622 iscsi_thread_set_free();
623 configfs_out:
624 iscsi_target_deregister_configfs();
625 out:
626 kfree(iscsit_global);
627 return -ENOMEM;
628 }
629
630 static void __exit iscsi_target_cleanup_module(void)
631 {
632 iscsi_deallocate_thread_sets();
633 iscsi_thread_set_free();
634 iscsit_release_discovery_tpg();
635 iscsit_unregister_transport(&iscsi_target_transport);
636 kmem_cache_destroy(lio_qr_cache);
637 kmem_cache_destroy(lio_dr_cache);
638 kmem_cache_destroy(lio_ooo_cache);
639 kmem_cache_destroy(lio_r2t_cache);
640
641 iscsi_target_deregister_configfs();
642
643 kfree(iscsit_global);
644 }
645
646 static int iscsit_add_reject(
647 struct iscsi_conn *conn,
648 u8 reason,
649 unsigned char *buf)
650 {
651 struct iscsi_cmd *cmd;
652
653 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
654 if (!cmd)
655 return -1;
656
657 cmd->iscsi_opcode = ISCSI_OP_REJECT;
658 cmd->reject_reason = reason;
659
660 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
661 if (!cmd->buf_ptr) {
662 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
663 iscsit_free_cmd(cmd, false);
664 return -1;
665 }
666
667 spin_lock_bh(&conn->cmd_lock);
668 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
669 spin_unlock_bh(&conn->cmd_lock);
670
671 cmd->i_state = ISTATE_SEND_REJECT;
672 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
673
674 return -1;
675 }
676
677 static int iscsit_add_reject_from_cmd(
678 struct iscsi_cmd *cmd,
679 u8 reason,
680 bool add_to_conn,
681 unsigned char *buf)
682 {
683 struct iscsi_conn *conn;
684
685 if (!cmd->conn) {
686 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
687 cmd->init_task_tag);
688 return -1;
689 }
690 conn = cmd->conn;
691
692 cmd->iscsi_opcode = ISCSI_OP_REJECT;
693 cmd->reject_reason = reason;
694
695 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
696 if (!cmd->buf_ptr) {
697 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
698 iscsit_free_cmd(cmd, false);
699 return -1;
700 }
701
702 if (add_to_conn) {
703 spin_lock_bh(&conn->cmd_lock);
704 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
705 spin_unlock_bh(&conn->cmd_lock);
706 }
707
708 cmd->i_state = ISTATE_SEND_REJECT;
709 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
710 /*
711 * Perform the kref_put now if se_cmd has already been setup by
712 * scsit_setup_scsi_cmd()
713 */
714 if (cmd->se_cmd.se_tfo != NULL) {
715 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
716 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
717 }
718 return -1;
719 }
720
721 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
722 unsigned char *buf)
723 {
724 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
725 }
726
727 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
728 {
729 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
730 }
731
732 /*
733 * Map some portion of the allocated scatterlist to an iovec, suitable for
734 * kernel sockets to copy data in/out.
735 */
736 static int iscsit_map_iovec(
737 struct iscsi_cmd *cmd,
738 struct kvec *iov,
739 u32 data_offset,
740 u32 data_length)
741 {
742 u32 i = 0;
743 struct scatterlist *sg;
744 unsigned int page_off;
745
746 /*
747 * We know each entry in t_data_sg contains a page.
748 */
749 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
750 page_off = (data_offset % PAGE_SIZE);
751
752 cmd->first_data_sg = sg;
753 cmd->first_data_sg_off = page_off;
754
755 while (data_length) {
756 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
757
758 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
759 iov[i].iov_len = cur_len;
760
761 data_length -= cur_len;
762 page_off = 0;
763 sg = sg_next(sg);
764 i++;
765 }
766
767 cmd->kmapped_nents = i;
768
769 return i;
770 }
771
772 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
773 {
774 u32 i;
775 struct scatterlist *sg;
776
777 sg = cmd->first_data_sg;
778
779 for (i = 0; i < cmd->kmapped_nents; i++)
780 kunmap(sg_page(&sg[i]));
781 }
782
783 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
784 {
785 LIST_HEAD(ack_list);
786 struct iscsi_cmd *cmd, *cmd_p;
787
788 conn->exp_statsn = exp_statsn;
789
790 if (conn->sess->sess_ops->RDMAExtensions)
791 return;
792
793 spin_lock_bh(&conn->cmd_lock);
794 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
795 spin_lock(&cmd->istate_lock);
796 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
797 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
798 cmd->i_state = ISTATE_REMOVE;
799 spin_unlock(&cmd->istate_lock);
800 list_move_tail(&cmd->i_conn_node, &ack_list);
801 continue;
802 }
803 spin_unlock(&cmd->istate_lock);
804 }
805 spin_unlock_bh(&conn->cmd_lock);
806
807 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
808 list_del_init(&cmd->i_conn_node);
809 iscsit_free_cmd(cmd, false);
810 }
811 }
812
813 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
814 {
815 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
816
817 iov_count += ISCSI_IOV_DATA_BUFFER;
818
819 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
820 if (!cmd->iov_data) {
821 pr_err("Unable to allocate cmd->iov_data\n");
822 return -ENOMEM;
823 }
824
825 cmd->orig_iov_data_count = iov_count;
826 return 0;
827 }
828
829 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
830 unsigned char *buf)
831 {
832 int data_direction, payload_length;
833 struct iscsi_scsi_req *hdr;
834 int iscsi_task_attr;
835 int sam_task_attr;
836
837 atomic_long_inc(&conn->sess->cmd_pdus);
838
839 hdr = (struct iscsi_scsi_req *) buf;
840 payload_length = ntoh24(hdr->dlength);
841
842 /* FIXME; Add checks for AdditionalHeaderSegment */
843
844 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
845 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
846 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
847 " not set. Bad iSCSI Initiator.\n");
848 return iscsit_add_reject_cmd(cmd,
849 ISCSI_REASON_BOOKMARK_INVALID, buf);
850 }
851
852 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
853 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
854 /*
855 * From RFC-3720 Section 10.3.1:
856 *
857 * "Either or both of R and W MAY be 1 when either the
858 * Expected Data Transfer Length and/or Bidirectional Read
859 * Expected Data Transfer Length are 0"
860 *
861 * For this case, go ahead and clear the unnecssary bits
862 * to avoid any confusion with ->data_direction.
863 */
864 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
865 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
866
867 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
868 " set when Expected Data Transfer Length is 0 for"
869 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
870 }
871
872 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
873 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
874 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
875 " MUST be set if Expected Data Transfer Length is not 0."
876 " Bad iSCSI Initiator\n");
877 return iscsit_add_reject_cmd(cmd,
878 ISCSI_REASON_BOOKMARK_INVALID, buf);
879 }
880
881 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
882 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
883 pr_err("Bidirectional operations not supported!\n");
884 return iscsit_add_reject_cmd(cmd,
885 ISCSI_REASON_BOOKMARK_INVALID, buf);
886 }
887
888 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
889 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
890 " Scsi Command PDU.\n");
891 return iscsit_add_reject_cmd(cmd,
892 ISCSI_REASON_BOOKMARK_INVALID, buf);
893 }
894
895 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
896 pr_err("ImmediateData=No but DataSegmentLength=%u,"
897 " protocol error.\n", payload_length);
898 return iscsit_add_reject_cmd(cmd,
899 ISCSI_REASON_PROTOCOL_ERROR, buf);
900 }
901
902 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
903 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
904 pr_err("Expected Data Transfer Length and Length of"
905 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
906 " bit is not set protocol error\n");
907 return iscsit_add_reject_cmd(cmd,
908 ISCSI_REASON_PROTOCOL_ERROR, buf);
909 }
910
911 if (payload_length > be32_to_cpu(hdr->data_length)) {
912 pr_err("DataSegmentLength: %u is greater than"
913 " EDTL: %u, protocol error.\n", payload_length,
914 hdr->data_length);
915 return iscsit_add_reject_cmd(cmd,
916 ISCSI_REASON_PROTOCOL_ERROR, buf);
917 }
918
919 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
920 pr_err("DataSegmentLength: %u is greater than"
921 " MaxXmitDataSegmentLength: %u, protocol error.\n",
922 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
923 return iscsit_add_reject_cmd(cmd,
924 ISCSI_REASON_PROTOCOL_ERROR, buf);
925 }
926
927 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
928 pr_err("DataSegmentLength: %u is greater than"
929 " FirstBurstLength: %u, protocol error.\n",
930 payload_length, conn->sess->sess_ops->FirstBurstLength);
931 return iscsit_add_reject_cmd(cmd,
932 ISCSI_REASON_BOOKMARK_INVALID, buf);
933 }
934
935 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
936 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
937 DMA_NONE;
938
939 cmd->data_direction = data_direction;
940 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
941 /*
942 * Figure out the SAM Task Attribute for the incoming SCSI CDB
943 */
944 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
945 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
946 sam_task_attr = MSG_SIMPLE_TAG;
947 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
948 sam_task_attr = MSG_ORDERED_TAG;
949 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
950 sam_task_attr = MSG_HEAD_TAG;
951 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
952 sam_task_attr = MSG_ACA_TAG;
953 else {
954 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
955 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
956 sam_task_attr = MSG_SIMPLE_TAG;
957 }
958
959 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
960 cmd->i_state = ISTATE_NEW_CMD;
961 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
962 cmd->immediate_data = (payload_length) ? 1 : 0;
963 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
964 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
965 if (cmd->unsolicited_data)
966 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
967
968 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
969 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
970 spin_lock_bh(&conn->sess->ttt_lock);
971 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
972 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
973 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
974 spin_unlock_bh(&conn->sess->ttt_lock);
975 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
976 cmd->targ_xfer_tag = 0xFFFFFFFF;
977 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
978 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
979 cmd->first_burst_len = payload_length;
980
981 if (!conn->sess->sess_ops->RDMAExtensions &&
982 cmd->data_direction == DMA_FROM_DEVICE) {
983 struct iscsi_datain_req *dr;
984
985 dr = iscsit_allocate_datain_req();
986 if (!dr)
987 return iscsit_add_reject_cmd(cmd,
988 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
989
990 iscsit_attach_datain_req(cmd, dr);
991 }
992
993 /*
994 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
995 */
996 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
997 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
998 cmd->data_direction, sam_task_attr,
999 cmd->sense_buffer + 2);
1000
1001 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1002 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1003 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1004 conn->cid);
1005
1006 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1007
1008 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1009 scsilun_to_int(&hdr->lun));
1010 if (cmd->sense_reason)
1011 goto attach_cmd;
1012
1013 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1014 if (cmd->sense_reason) {
1015 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1016 return iscsit_add_reject_cmd(cmd,
1017 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1018 }
1019
1020 goto attach_cmd;
1021 }
1022
1023 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1024 return iscsit_add_reject_cmd(cmd,
1025 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1026 }
1027
1028 attach_cmd:
1029 spin_lock_bh(&conn->cmd_lock);
1030 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1031 spin_unlock_bh(&conn->cmd_lock);
1032 /*
1033 * Check if we need to delay processing because of ALUA
1034 * Active/NonOptimized primary access state..
1035 */
1036 core_alua_check_nonop_delay(&cmd->se_cmd);
1037
1038 return 0;
1039 }
1040 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1041
1042 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1043 {
1044 iscsit_set_dataout_sequence_values(cmd);
1045
1046 spin_lock_bh(&cmd->dataout_timeout_lock);
1047 iscsit_start_dataout_timer(cmd, cmd->conn);
1048 spin_unlock_bh(&cmd->dataout_timeout_lock);
1049 }
1050 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1051
1052 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1053 struct iscsi_scsi_req *hdr)
1054 {
1055 int cmdsn_ret = 0;
1056 /*
1057 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1058 * the Immediate Bit is not set, and no Immediate
1059 * Data is attached.
1060 *
1061 * A PDU/CmdSN carrying Immediate Data can only
1062 * be processed after the DataCRC has passed.
1063 * If the DataCRC fails, the CmdSN MUST NOT
1064 * be acknowledged. (See below)
1065 */
1066 if (!cmd->immediate_data) {
1067 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1068 (unsigned char *)hdr, hdr->cmdsn);
1069 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1070 return -1;
1071 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1072 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1073 return 0;
1074 }
1075 }
1076
1077 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1078
1079 /*
1080 * If no Immediate Data is attached, it's OK to return now.
1081 */
1082 if (!cmd->immediate_data) {
1083 if (!cmd->sense_reason && cmd->unsolicited_data)
1084 iscsit_set_unsoliticed_dataout(cmd);
1085 if (!cmd->sense_reason)
1086 return 0;
1087
1088 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1089 return 0;
1090 }
1091
1092 /*
1093 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1094 * execution. These exceptions are processed in CmdSN order using
1095 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1096 */
1097 if (cmd->sense_reason) {
1098 if (cmd->reject_reason)
1099 return 0;
1100
1101 return 1;
1102 }
1103 /*
1104 * Call directly into transport_generic_new_cmd() to perform
1105 * the backend memory allocation.
1106 */
1107 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1108 if (cmd->sense_reason)
1109 return 1;
1110
1111 return 0;
1112 }
1113 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1114
1115 static int
1116 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1117 bool dump_payload)
1118 {
1119 struct iscsi_conn *conn = cmd->conn;
1120 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1121 /*
1122 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1123 */
1124 if (dump_payload == true)
1125 goto after_immediate_data;
1126
1127 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1128 cmd->first_burst_len);
1129 after_immediate_data:
1130 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1131 /*
1132 * A PDU/CmdSN carrying Immediate Data passed
1133 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1134 * Immediate Bit is not set.
1135 */
1136 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1137 (unsigned char *)hdr, hdr->cmdsn);
1138 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1139 return -1;
1140
1141 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1142 int rc;
1143
1144 rc = iscsit_dump_data_payload(cmd->conn,
1145 cmd->first_burst_len, 1);
1146 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1147 return rc;
1148 } else if (cmd->unsolicited_data)
1149 iscsit_set_unsoliticed_dataout(cmd);
1150
1151 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1152 /*
1153 * Immediate Data failed DataCRC and ERL>=1,
1154 * silently drop this PDU and let the initiator
1155 * plug the CmdSN gap.
1156 *
1157 * FIXME: Send Unsolicited NOPIN with reserved
1158 * TTT here to help the initiator figure out
1159 * the missing CmdSN, although they should be
1160 * intelligent enough to determine the missing
1161 * CmdSN and issue a retry to plug the sequence.
1162 */
1163 cmd->i_state = ISTATE_REMOVE;
1164 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1165 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1166 return -1;
1167
1168 return 0;
1169 }
1170
1171 static int
1172 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1173 unsigned char *buf)
1174 {
1175 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1176 int rc, immed_data;
1177 bool dump_payload = false;
1178
1179 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1180 if (rc < 0)
1181 return 0;
1182 /*
1183 * Allocation iovecs needed for struct socket operations for
1184 * traditional iSCSI block I/O.
1185 */
1186 if (iscsit_allocate_iovecs(cmd) < 0) {
1187 return iscsit_add_reject_cmd(cmd,
1188 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1189 }
1190 immed_data = cmd->immediate_data;
1191
1192 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1193 if (rc < 0)
1194 return rc;
1195 else if (rc > 0)
1196 dump_payload = true;
1197
1198 if (!immed_data)
1199 return 0;
1200
1201 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1202 }
1203
1204 static u32 iscsit_do_crypto_hash_sg(
1205 struct hash_desc *hash,
1206 struct iscsi_cmd *cmd,
1207 u32 data_offset,
1208 u32 data_length,
1209 u32 padding,
1210 u8 *pad_bytes)
1211 {
1212 u32 data_crc;
1213 u32 i;
1214 struct scatterlist *sg;
1215 unsigned int page_off;
1216
1217 crypto_hash_init(hash);
1218
1219 sg = cmd->first_data_sg;
1220 page_off = cmd->first_data_sg_off;
1221
1222 i = 0;
1223 while (data_length) {
1224 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1225
1226 crypto_hash_update(hash, &sg[i], cur_len);
1227
1228 data_length -= cur_len;
1229 page_off = 0;
1230 i++;
1231 }
1232
1233 if (padding) {
1234 struct scatterlist pad_sg;
1235
1236 sg_init_one(&pad_sg, pad_bytes, padding);
1237 crypto_hash_update(hash, &pad_sg, padding);
1238 }
1239 crypto_hash_final(hash, (u8 *) &data_crc);
1240
1241 return data_crc;
1242 }
1243
1244 static void iscsit_do_crypto_hash_buf(
1245 struct hash_desc *hash,
1246 const void *buf,
1247 u32 payload_length,
1248 u32 padding,
1249 u8 *pad_bytes,
1250 u8 *data_crc)
1251 {
1252 struct scatterlist sg;
1253
1254 crypto_hash_init(hash);
1255
1256 sg_init_one(&sg, buf, payload_length);
1257 crypto_hash_update(hash, &sg, payload_length);
1258
1259 if (padding) {
1260 sg_init_one(&sg, pad_bytes, padding);
1261 crypto_hash_update(hash, &sg, padding);
1262 }
1263 crypto_hash_final(hash, data_crc);
1264 }
1265
1266 int
1267 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1268 struct iscsi_cmd **out_cmd)
1269 {
1270 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1271 struct iscsi_cmd *cmd = NULL;
1272 struct se_cmd *se_cmd;
1273 u32 payload_length = ntoh24(hdr->dlength);
1274 int rc;
1275
1276 if (!payload_length) {
1277 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1278 return 0;
1279 }
1280
1281 /* iSCSI write */
1282 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1283
1284 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1285 pr_err("DataSegmentLength: %u is greater than"
1286 " MaxXmitDataSegmentLength: %u\n", payload_length,
1287 conn->conn_ops->MaxXmitDataSegmentLength);
1288 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1289 buf);
1290 }
1291
1292 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1293 payload_length);
1294 if (!cmd)
1295 return 0;
1296
1297 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1298 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1299 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1300 payload_length, conn->cid);
1301
1302 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1303 pr_err("Command ITT: 0x%08x received DataOUT after"
1304 " last DataOUT received, dumping payload\n",
1305 cmd->init_task_tag);
1306 return iscsit_dump_data_payload(conn, payload_length, 1);
1307 }
1308
1309 if (cmd->data_direction != DMA_TO_DEVICE) {
1310 pr_err("Command ITT: 0x%08x received DataOUT for a"
1311 " NON-WRITE command.\n", cmd->init_task_tag);
1312 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
1313 }
1314 se_cmd = &cmd->se_cmd;
1315 iscsit_mod_dataout_timer(cmd);
1316
1317 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1318 pr_err("DataOut Offset: %u, Length %u greater than"
1319 " iSCSI Command EDTL %u, protocol error.\n",
1320 hdr->offset, payload_length, cmd->se_cmd.data_length);
1321 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1322 }
1323
1324 if (cmd->unsolicited_data) {
1325 int dump_unsolicited_data = 0;
1326
1327 if (conn->sess->sess_ops->InitialR2T) {
1328 pr_err("Received unexpected unsolicited data"
1329 " while InitialR2T=Yes, protocol error.\n");
1330 transport_send_check_condition_and_sense(&cmd->se_cmd,
1331 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1332 return -1;
1333 }
1334 /*
1335 * Special case for dealing with Unsolicited DataOUT
1336 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1337 * failures;
1338 */
1339
1340 /* Something's amiss if we're not in WRITE_PENDING state... */
1341 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1342 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1343 dump_unsolicited_data = 1;
1344
1345 if (dump_unsolicited_data) {
1346 /*
1347 * Check if a delayed TASK_ABORTED status needs to
1348 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1349 * received with the unsolicitied data out.
1350 */
1351 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1352 iscsit_stop_dataout_timer(cmd);
1353
1354 transport_check_aborted_status(se_cmd,
1355 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1356 return iscsit_dump_data_payload(conn, payload_length, 1);
1357 }
1358 } else {
1359 /*
1360 * For the normal solicited data path:
1361 *
1362 * Check for a delayed TASK_ABORTED status and dump any
1363 * incoming data out payload if one exists. Also, when the
1364 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1365 * data out sequence, we decrement outstanding_r2ts. Once
1366 * outstanding_r2ts reaches zero, go ahead and send the delayed
1367 * TASK_ABORTED status.
1368 */
1369 if (se_cmd->transport_state & CMD_T_ABORTED) {
1370 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1371 if (--cmd->outstanding_r2ts < 1) {
1372 iscsit_stop_dataout_timer(cmd);
1373 transport_check_aborted_status(
1374 se_cmd, 1);
1375 }
1376
1377 return iscsit_dump_data_payload(conn, payload_length, 1);
1378 }
1379 }
1380 /*
1381 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1382 * within-command recovery checks before receiving the payload.
1383 */
1384 rc = iscsit_check_pre_dataout(cmd, buf);
1385 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1386 return 0;
1387 else if (rc == DATAOUT_CANNOT_RECOVER)
1388 return -1;
1389
1390 *out_cmd = cmd;
1391 return 0;
1392 }
1393 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1394
1395 static int
1396 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1397 struct iscsi_data *hdr)
1398 {
1399 struct kvec *iov;
1400 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1401 u32 payload_length = ntoh24(hdr->dlength);
1402 int iov_ret, data_crc_failed = 0;
1403
1404 rx_size += payload_length;
1405 iov = &cmd->iov_data[0];
1406
1407 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1408 payload_length);
1409 if (iov_ret < 0)
1410 return -1;
1411
1412 iov_count += iov_ret;
1413
1414 padding = ((-payload_length) & 3);
1415 if (padding != 0) {
1416 iov[iov_count].iov_base = cmd->pad_bytes;
1417 iov[iov_count++].iov_len = padding;
1418 rx_size += padding;
1419 pr_debug("Receiving %u padding bytes.\n", padding);
1420 }
1421
1422 if (conn->conn_ops->DataDigest) {
1423 iov[iov_count].iov_base = &checksum;
1424 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1425 rx_size += ISCSI_CRC_LEN;
1426 }
1427
1428 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1429
1430 iscsit_unmap_iovec(cmd);
1431
1432 if (rx_got != rx_size)
1433 return -1;
1434
1435 if (conn->conn_ops->DataDigest) {
1436 u32 data_crc;
1437
1438 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1439 be32_to_cpu(hdr->offset),
1440 payload_length, padding,
1441 cmd->pad_bytes);
1442
1443 if (checksum != data_crc) {
1444 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1445 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1446 " does not match computed 0x%08x\n",
1447 hdr->itt, hdr->offset, payload_length,
1448 hdr->datasn, checksum, data_crc);
1449 data_crc_failed = 1;
1450 } else {
1451 pr_debug("Got CRC32C DataDigest 0x%08x for"
1452 " %u bytes of Data Out\n", checksum,
1453 payload_length);
1454 }
1455 }
1456
1457 return data_crc_failed;
1458 }
1459
1460 int
1461 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1462 bool data_crc_failed)
1463 {
1464 struct iscsi_conn *conn = cmd->conn;
1465 int rc, ooo_cmdsn;
1466 /*
1467 * Increment post receive data and CRC values or perform
1468 * within-command recovery.
1469 */
1470 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1471 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1472 return 0;
1473 else if (rc == DATAOUT_SEND_R2T) {
1474 iscsit_set_dataout_sequence_values(cmd);
1475 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1476 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1477 /*
1478 * Handle extra special case for out of order
1479 * Unsolicited Data Out.
1480 */
1481 spin_lock_bh(&cmd->istate_lock);
1482 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1483 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1484 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1485 spin_unlock_bh(&cmd->istate_lock);
1486
1487 iscsit_stop_dataout_timer(cmd);
1488 if (ooo_cmdsn)
1489 return 0;
1490 target_execute_cmd(&cmd->se_cmd);
1491 return 0;
1492 } else /* DATAOUT_CANNOT_RECOVER */
1493 return -1;
1494
1495 return 0;
1496 }
1497 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1498
1499 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1500 {
1501 struct iscsi_cmd *cmd = NULL;
1502 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1503 int rc;
1504 bool data_crc_failed = false;
1505
1506 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1507 if (rc < 0)
1508 return 0;
1509 else if (!cmd)
1510 return 0;
1511
1512 rc = iscsit_get_dataout(conn, cmd, hdr);
1513 if (rc < 0)
1514 return rc;
1515 else if (rc > 0)
1516 data_crc_failed = true;
1517
1518 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1519 }
1520
1521 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1522 struct iscsi_nopout *hdr)
1523 {
1524 u32 payload_length = ntoh24(hdr->dlength);
1525
1526 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1527 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1528 if (!cmd)
1529 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1530 (unsigned char *)hdr);
1531
1532 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1533 (unsigned char *)hdr);
1534 }
1535
1536 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1537 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1538 " not set, protocol error.\n");
1539 if (!cmd)
1540 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1541 (unsigned char *)hdr);
1542
1543 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1544 (unsigned char *)hdr);
1545 }
1546
1547 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1548 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1549 " greater than MaxXmitDataSegmentLength: %u, protocol"
1550 " error.\n", payload_length,
1551 conn->conn_ops->MaxXmitDataSegmentLength);
1552 if (!cmd)
1553 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1554 (unsigned char *)hdr);
1555
1556 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1557 (unsigned char *)hdr);
1558 }
1559
1560 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1561 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1562 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1563 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1564 payload_length);
1565 /*
1566 * This is not a response to a Unsolicited NopIN, which means
1567 * it can either be a NOPOUT ping request (with a valid ITT),
1568 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1569 * Either way, make sure we allocate an struct iscsi_cmd, as both
1570 * can contain ping data.
1571 */
1572 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1573 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1574 cmd->i_state = ISTATE_SEND_NOPIN;
1575 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1576 1 : 0);
1577 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1578 cmd->targ_xfer_tag = 0xFFFFFFFF;
1579 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1580 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1581 cmd->data_direction = DMA_NONE;
1582 }
1583
1584 return 0;
1585 }
1586 EXPORT_SYMBOL(iscsit_setup_nop_out);
1587
1588 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1589 struct iscsi_nopout *hdr)
1590 {
1591 struct iscsi_cmd *cmd_p = NULL;
1592 int cmdsn_ret = 0;
1593 /*
1594 * Initiator is expecting a NopIN ping reply..
1595 */
1596 if (hdr->itt != RESERVED_ITT) {
1597 if (!cmd)
1598 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1599 (unsigned char *)hdr);
1600
1601 spin_lock_bh(&conn->cmd_lock);
1602 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1603 spin_unlock_bh(&conn->cmd_lock);
1604
1605 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1606
1607 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1608 iscsit_add_cmd_to_response_queue(cmd, conn,
1609 cmd->i_state);
1610 return 0;
1611 }
1612
1613 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1614 (unsigned char *)hdr, hdr->cmdsn);
1615 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1616 return 0;
1617 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1618 return -1;
1619
1620 return 0;
1621 }
1622 /*
1623 * This was a response to a unsolicited NOPIN ping.
1624 */
1625 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1626 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1627 if (!cmd_p)
1628 return -EINVAL;
1629
1630 iscsit_stop_nopin_response_timer(conn);
1631
1632 cmd_p->i_state = ISTATE_REMOVE;
1633 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1634
1635 iscsit_start_nopin_timer(conn);
1636 return 0;
1637 }
1638 /*
1639 * Otherwise, initiator is not expecting a NOPIN is response.
1640 * Just ignore for now.
1641 */
1642 return 0;
1643 }
1644 EXPORT_SYMBOL(iscsit_process_nop_out);
1645
1646 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1647 unsigned char *buf)
1648 {
1649 unsigned char *ping_data = NULL;
1650 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1651 struct kvec *iov = NULL;
1652 u32 payload_length = ntoh24(hdr->dlength);
1653 int ret;
1654
1655 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1656 if (ret < 0)
1657 return 0;
1658 /*
1659 * Handle NOP-OUT payload for traditional iSCSI sockets
1660 */
1661 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1662 u32 checksum, data_crc, padding = 0;
1663 int niov = 0, rx_got, rx_size = payload_length;
1664
1665 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1666 if (!ping_data) {
1667 pr_err("Unable to allocate memory for"
1668 " NOPOUT ping data.\n");
1669 ret = -1;
1670 goto out;
1671 }
1672
1673 iov = &cmd->iov_misc[0];
1674 iov[niov].iov_base = ping_data;
1675 iov[niov++].iov_len = payload_length;
1676
1677 padding = ((-payload_length) & 3);
1678 if (padding != 0) {
1679 pr_debug("Receiving %u additional bytes"
1680 " for padding.\n", padding);
1681 iov[niov].iov_base = &cmd->pad_bytes;
1682 iov[niov++].iov_len = padding;
1683 rx_size += padding;
1684 }
1685 if (conn->conn_ops->DataDigest) {
1686 iov[niov].iov_base = &checksum;
1687 iov[niov++].iov_len = ISCSI_CRC_LEN;
1688 rx_size += ISCSI_CRC_LEN;
1689 }
1690
1691 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1692 if (rx_got != rx_size) {
1693 ret = -1;
1694 goto out;
1695 }
1696
1697 if (conn->conn_ops->DataDigest) {
1698 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1699 ping_data, payload_length,
1700 padding, cmd->pad_bytes,
1701 (u8 *)&data_crc);
1702
1703 if (checksum != data_crc) {
1704 pr_err("Ping data CRC32C DataDigest"
1705 " 0x%08x does not match computed 0x%08x\n",
1706 checksum, data_crc);
1707 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1708 pr_err("Unable to recover from"
1709 " NOPOUT Ping DataCRC failure while in"
1710 " ERL=0.\n");
1711 ret = -1;
1712 goto out;
1713 } else {
1714 /*
1715 * Silently drop this PDU and let the
1716 * initiator plug the CmdSN gap.
1717 */
1718 pr_debug("Dropping NOPOUT"
1719 " Command CmdSN: 0x%08x due to"
1720 " DataCRC error.\n", hdr->cmdsn);
1721 ret = 0;
1722 goto out;
1723 }
1724 } else {
1725 pr_debug("Got CRC32C DataDigest"
1726 " 0x%08x for %u bytes of ping data.\n",
1727 checksum, payload_length);
1728 }
1729 }
1730
1731 ping_data[payload_length] = '\0';
1732 /*
1733 * Attach ping data to struct iscsi_cmd->buf_ptr.
1734 */
1735 cmd->buf_ptr = ping_data;
1736 cmd->buf_ptr_size = payload_length;
1737
1738 pr_debug("Got %u bytes of NOPOUT ping"
1739 " data.\n", payload_length);
1740 pr_debug("Ping Data: \"%s\"\n", ping_data);
1741 }
1742
1743 return iscsit_process_nop_out(conn, cmd, hdr);
1744 out:
1745 if (cmd)
1746 iscsit_free_cmd(cmd, false);
1747
1748 kfree(ping_data);
1749 return ret;
1750 }
1751
1752 int
1753 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1754 unsigned char *buf)
1755 {
1756 struct se_tmr_req *se_tmr;
1757 struct iscsi_tmr_req *tmr_req;
1758 struct iscsi_tm *hdr;
1759 int out_of_order_cmdsn = 0, ret;
1760 bool sess_ref = false;
1761 u8 function;
1762
1763 hdr = (struct iscsi_tm *) buf;
1764 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1765 function = hdr->flags;
1766
1767 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1768 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1769 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1770 hdr->rtt, hdr->refcmdsn, conn->cid);
1771
1772 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1773 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1774 hdr->rtt != RESERVED_ITT)) {
1775 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1776 hdr->rtt = RESERVED_ITT;
1777 }
1778
1779 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1780 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1781 pr_err("Task Management Request TASK_REASSIGN not"
1782 " issued as immediate command, bad iSCSI Initiator"
1783 "implementation\n");
1784 return iscsit_add_reject_cmd(cmd,
1785 ISCSI_REASON_PROTOCOL_ERROR, buf);
1786 }
1787 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1788 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1789 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1790
1791 cmd->data_direction = DMA_NONE;
1792
1793 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1794 if (!cmd->tmr_req) {
1795 pr_err("Unable to allocate memory for"
1796 " Task Management command!\n");
1797 return iscsit_add_reject_cmd(cmd,
1798 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1799 buf);
1800 }
1801
1802 /*
1803 * TASK_REASSIGN for ERL=2 / connection stays inside of
1804 * LIO-Target $FABRIC_MOD
1805 */
1806 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1807
1808 u8 tcm_function;
1809 int ret;
1810
1811 transport_init_se_cmd(&cmd->se_cmd,
1812 &lio_target_fabric_configfs->tf_ops,
1813 conn->sess->se_sess, 0, DMA_NONE,
1814 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1815
1816 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1817 sess_ref = true;
1818
1819 switch (function) {
1820 case ISCSI_TM_FUNC_ABORT_TASK:
1821 tcm_function = TMR_ABORT_TASK;
1822 break;
1823 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1824 tcm_function = TMR_ABORT_TASK_SET;
1825 break;
1826 case ISCSI_TM_FUNC_CLEAR_ACA:
1827 tcm_function = TMR_CLEAR_ACA;
1828 break;
1829 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1830 tcm_function = TMR_CLEAR_TASK_SET;
1831 break;
1832 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1833 tcm_function = TMR_LUN_RESET;
1834 break;
1835 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1836 tcm_function = TMR_TARGET_WARM_RESET;
1837 break;
1838 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1839 tcm_function = TMR_TARGET_COLD_RESET;
1840 break;
1841 default:
1842 pr_err("Unknown iSCSI TMR Function:"
1843 " 0x%02x\n", function);
1844 return iscsit_add_reject_cmd(cmd,
1845 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1846 }
1847
1848 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1849 tcm_function, GFP_KERNEL);
1850 if (ret < 0)
1851 return iscsit_add_reject_cmd(cmd,
1852 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1853
1854 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1855 }
1856
1857 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1858 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1859 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1860 cmd->init_task_tag = hdr->itt;
1861 cmd->targ_xfer_tag = 0xFFFFFFFF;
1862 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1863 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1864 se_tmr = cmd->se_cmd.se_tmr_req;
1865 tmr_req = cmd->tmr_req;
1866 /*
1867 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1868 */
1869 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1870 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1871 scsilun_to_int(&hdr->lun));
1872 if (ret < 0) {
1873 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1874 goto attach;
1875 }
1876 }
1877
1878 switch (function) {
1879 case ISCSI_TM_FUNC_ABORT_TASK:
1880 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1881 if (se_tmr->response)
1882 goto attach;
1883 break;
1884 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1885 case ISCSI_TM_FUNC_CLEAR_ACA:
1886 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1887 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1888 break;
1889 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1890 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1891 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1892 goto attach;
1893 }
1894 break;
1895 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1896 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1897 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1898 goto attach;
1899 }
1900 break;
1901 case ISCSI_TM_FUNC_TASK_REASSIGN:
1902 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1903 /*
1904 * Perform sanity checks on the ExpDataSN only if the
1905 * TASK_REASSIGN was successful.
1906 */
1907 if (se_tmr->response)
1908 break;
1909
1910 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1911 return iscsit_add_reject_cmd(cmd,
1912 ISCSI_REASON_BOOKMARK_INVALID, buf);
1913 break;
1914 default:
1915 pr_err("Unknown TMR function: 0x%02x, protocol"
1916 " error.\n", function);
1917 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1918 goto attach;
1919 }
1920
1921 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1922 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1923 se_tmr->call_transport = 1;
1924 attach:
1925 spin_lock_bh(&conn->cmd_lock);
1926 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1927 spin_unlock_bh(&conn->cmd_lock);
1928
1929 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1930 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1931 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1932 out_of_order_cmdsn = 1;
1933 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1934 return 0;
1935 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1936 return -1;
1937 }
1938 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1939
1940 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1941 return 0;
1942 /*
1943 * Found the referenced task, send to transport for processing.
1944 */
1945 if (se_tmr->call_transport)
1946 return transport_generic_handle_tmr(&cmd->se_cmd);
1947
1948 /*
1949 * Could not find the referenced LUN, task, or Task Management
1950 * command not authorized or supported. Change state and
1951 * let the tx_thread send the response.
1952 *
1953 * For connection recovery, this is also the default action for
1954 * TMR TASK_REASSIGN.
1955 */
1956 if (sess_ref) {
1957 pr_debug("Handle TMR, using sess_ref=true check\n");
1958 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1959 }
1960
1961 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1962 return 0;
1963 }
1964 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1965
1966 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1967 int
1968 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1969 struct iscsi_text *hdr)
1970 {
1971 u32 payload_length = ntoh24(hdr->dlength);
1972
1973 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1974 pr_err("Unable to accept text parameter length: %u"
1975 "greater than MaxXmitDataSegmentLength %u.\n",
1976 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1977 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1978 (unsigned char *)hdr);
1979 }
1980
1981 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1982 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1983 pr_err("Multi sequence text commands currently not supported\n");
1984 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1985 (unsigned char *)hdr);
1986 }
1987
1988 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1989 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1990 hdr->exp_statsn, payload_length);
1991
1992 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1993 cmd->i_state = ISTATE_SEND_TEXTRSP;
1994 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1995 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1996 cmd->targ_xfer_tag = 0xFFFFFFFF;
1997 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1998 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1999 cmd->data_direction = DMA_NONE;
2000
2001 return 0;
2002 }
2003 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2004
2005 int
2006 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2007 struct iscsi_text *hdr)
2008 {
2009 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2010 int cmdsn_ret;
2011
2012 if (!text_in) {
2013 pr_err("Unable to locate text_in buffer for sendtargets"
2014 " discovery\n");
2015 goto reject;
2016 }
2017 if (strncmp("SendTargets", text_in, 11) != 0) {
2018 pr_err("Received Text Data that is not"
2019 " SendTargets, cannot continue.\n");
2020 goto reject;
2021 }
2022 text_ptr = strchr(text_in, '=');
2023 if (!text_ptr) {
2024 pr_err("No \"=\" separator found in Text Data,"
2025 " cannot continue.\n");
2026 goto reject;
2027 }
2028 if (!strncmp("=All", text_ptr, 4)) {
2029 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
2030 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2031 !strncmp("=eui.", text_ptr, 5)) {
2032 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
2033 } else {
2034 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2035 goto reject;
2036 }
2037
2038 spin_lock_bh(&conn->cmd_lock);
2039 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2040 spin_unlock_bh(&conn->cmd_lock);
2041
2042 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2043
2044 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2045 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2046 (unsigned char *)hdr, hdr->cmdsn);
2047 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2048 return -1;
2049
2050 return 0;
2051 }
2052
2053 return iscsit_execute_cmd(cmd, 0);
2054
2055 reject:
2056 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2057 (unsigned char *)hdr);
2058 }
2059 EXPORT_SYMBOL(iscsit_process_text_cmd);
2060
2061 static int
2062 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2063 unsigned char *buf)
2064 {
2065 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2066 char *text_in = NULL;
2067 u32 payload_length = ntoh24(hdr->dlength);
2068 int rx_size, rc;
2069
2070 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2071 if (rc < 0)
2072 return 0;
2073
2074 rx_size = payload_length;
2075 if (payload_length) {
2076 u32 checksum = 0, data_crc = 0;
2077 u32 padding = 0, pad_bytes = 0;
2078 int niov = 0, rx_got;
2079 struct kvec iov[3];
2080
2081 text_in = kzalloc(payload_length, GFP_KERNEL);
2082 if (!text_in) {
2083 pr_err("Unable to allocate memory for"
2084 " incoming text parameters\n");
2085 goto reject;
2086 }
2087 cmd->text_in_ptr = text_in;
2088
2089 memset(iov, 0, 3 * sizeof(struct kvec));
2090 iov[niov].iov_base = text_in;
2091 iov[niov++].iov_len = payload_length;
2092
2093 padding = ((-payload_length) & 3);
2094 if (padding != 0) {
2095 iov[niov].iov_base = &pad_bytes;
2096 iov[niov++].iov_len = padding;
2097 rx_size += padding;
2098 pr_debug("Receiving %u additional bytes"
2099 " for padding.\n", padding);
2100 }
2101 if (conn->conn_ops->DataDigest) {
2102 iov[niov].iov_base = &checksum;
2103 iov[niov++].iov_len = ISCSI_CRC_LEN;
2104 rx_size += ISCSI_CRC_LEN;
2105 }
2106
2107 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2108 if (rx_got != rx_size)
2109 goto reject;
2110
2111 if (conn->conn_ops->DataDigest) {
2112 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2113 text_in, payload_length,
2114 padding, (u8 *)&pad_bytes,
2115 (u8 *)&data_crc);
2116
2117 if (checksum != data_crc) {
2118 pr_err("Text data CRC32C DataDigest"
2119 " 0x%08x does not match computed"
2120 " 0x%08x\n", checksum, data_crc);
2121 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2122 pr_err("Unable to recover from"
2123 " Text Data digest failure while in"
2124 " ERL=0.\n");
2125 goto reject;
2126 } else {
2127 /*
2128 * Silently drop this PDU and let the
2129 * initiator plug the CmdSN gap.
2130 */
2131 pr_debug("Dropping Text"
2132 " Command CmdSN: 0x%08x due to"
2133 " DataCRC error.\n", hdr->cmdsn);
2134 kfree(text_in);
2135 return 0;
2136 }
2137 } else {
2138 pr_debug("Got CRC32C DataDigest"
2139 " 0x%08x for %u bytes of text data.\n",
2140 checksum, payload_length);
2141 }
2142 }
2143 text_in[payload_length - 1] = '\0';
2144 pr_debug("Successfully read %d bytes of text"
2145 " data.\n", payload_length);
2146 }
2147
2148 return iscsit_process_text_cmd(conn, cmd, hdr);
2149
2150 reject:
2151 kfree(cmd->text_in_ptr);
2152 cmd->text_in_ptr = NULL;
2153 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2154 }
2155 EXPORT_SYMBOL(iscsit_handle_text_cmd);
2156
2157 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2158 {
2159 struct iscsi_conn *conn_p;
2160 struct iscsi_session *sess = conn->sess;
2161
2162 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2163 " for SID: %u.\n", conn->cid, conn->sess->sid);
2164
2165 atomic_set(&sess->session_logout, 1);
2166 atomic_set(&conn->conn_logout_remove, 1);
2167 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2168
2169 iscsit_inc_conn_usage_count(conn);
2170 iscsit_inc_session_usage_count(sess);
2171
2172 spin_lock_bh(&sess->conn_lock);
2173 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2174 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2175 continue;
2176
2177 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2178 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2179 }
2180 spin_unlock_bh(&sess->conn_lock);
2181
2182 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2183
2184 return 0;
2185 }
2186
2187 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2188 {
2189 struct iscsi_conn *l_conn;
2190 struct iscsi_session *sess = conn->sess;
2191
2192 pr_debug("Received logout request CLOSECONNECTION for CID:"
2193 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2194
2195 /*
2196 * A Logout Request with a CLOSECONNECTION reason code for a CID
2197 * can arrive on a connection with a differing CID.
2198 */
2199 if (conn->cid == cmd->logout_cid) {
2200 spin_lock_bh(&conn->state_lock);
2201 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2202 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2203
2204 atomic_set(&conn->conn_logout_remove, 1);
2205 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2206 iscsit_inc_conn_usage_count(conn);
2207
2208 spin_unlock_bh(&conn->state_lock);
2209 } else {
2210 /*
2211 * Handle all different cid CLOSECONNECTION requests in
2212 * iscsit_logout_post_handler_diffcid() as to give enough
2213 * time for any non immediate command's CmdSN to be
2214 * acknowledged on the connection in question.
2215 *
2216 * Here we simply make sure the CID is still around.
2217 */
2218 l_conn = iscsit_get_conn_from_cid(sess,
2219 cmd->logout_cid);
2220 if (!l_conn) {
2221 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2222 iscsit_add_cmd_to_response_queue(cmd, conn,
2223 cmd->i_state);
2224 return 0;
2225 }
2226
2227 iscsit_dec_conn_usage_count(l_conn);
2228 }
2229
2230 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2231
2232 return 0;
2233 }
2234
2235 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2236 {
2237 struct iscsi_session *sess = conn->sess;
2238
2239 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2240 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2241
2242 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2243 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2244 " while ERL!=2.\n");
2245 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2246 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2247 return 0;
2248 }
2249
2250 if (conn->cid == cmd->logout_cid) {
2251 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2252 " with CID: %hu on CID: %hu, implementation error.\n",
2253 cmd->logout_cid, conn->cid);
2254 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2255 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2256 return 0;
2257 }
2258
2259 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2260
2261 return 0;
2262 }
2263
2264 int
2265 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2266 unsigned char *buf)
2267 {
2268 int cmdsn_ret, logout_remove = 0;
2269 u8 reason_code = 0;
2270 struct iscsi_logout *hdr;
2271 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2272
2273 hdr = (struct iscsi_logout *) buf;
2274 reason_code = (hdr->flags & 0x7f);
2275
2276 if (tiqn) {
2277 spin_lock(&tiqn->logout_stats.lock);
2278 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2279 tiqn->logout_stats.normal_logouts++;
2280 else
2281 tiqn->logout_stats.abnormal_logouts++;
2282 spin_unlock(&tiqn->logout_stats.lock);
2283 }
2284
2285 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2286 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2287 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2288 hdr->cid, conn->cid);
2289
2290 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2291 pr_err("Received logout request on connection that"
2292 " is not in logged in state, ignoring request.\n");
2293 iscsit_free_cmd(cmd, false);
2294 return 0;
2295 }
2296
2297 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2298 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2299 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2300 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2301 cmd->targ_xfer_tag = 0xFFFFFFFF;
2302 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2303 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2304 cmd->logout_cid = be16_to_cpu(hdr->cid);
2305 cmd->logout_reason = reason_code;
2306 cmd->data_direction = DMA_NONE;
2307
2308 /*
2309 * We need to sleep in these cases (by returning 1) until the Logout
2310 * Response gets sent in the tx thread.
2311 */
2312 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2313 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2314 be16_to_cpu(hdr->cid) == conn->cid))
2315 logout_remove = 1;
2316
2317 spin_lock_bh(&conn->cmd_lock);
2318 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2319 spin_unlock_bh(&conn->cmd_lock);
2320
2321 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2322 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2323
2324 /*
2325 * Immediate commands are executed, well, immediately.
2326 * Non-Immediate Logout Commands are executed in CmdSN order.
2327 */
2328 if (cmd->immediate_cmd) {
2329 int ret = iscsit_execute_cmd(cmd, 0);
2330
2331 if (ret < 0)
2332 return ret;
2333 } else {
2334 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2335 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2336 logout_remove = 0;
2337 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2338 return -1;
2339 }
2340
2341 return logout_remove;
2342 }
2343 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2344
2345 static int iscsit_handle_snack(
2346 struct iscsi_conn *conn,
2347 unsigned char *buf)
2348 {
2349 struct iscsi_snack *hdr;
2350
2351 hdr = (struct iscsi_snack *) buf;
2352 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2353
2354 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2355 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2356 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2357 hdr->begrun, hdr->runlength, conn->cid);
2358
2359 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2360 pr_err("Initiator sent SNACK request while in"
2361 " ErrorRecoveryLevel=0.\n");
2362 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2363 buf);
2364 }
2365 /*
2366 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2367 * call from inside iscsi_send_recovery_datain_or_r2t().
2368 */
2369 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2370 case 0:
2371 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2372 hdr->itt,
2373 be32_to_cpu(hdr->ttt),
2374 be32_to_cpu(hdr->begrun),
2375 be32_to_cpu(hdr->runlength));
2376 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2377 return iscsit_handle_status_snack(conn, hdr->itt,
2378 be32_to_cpu(hdr->ttt),
2379 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2380 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2381 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2382 be32_to_cpu(hdr->begrun),
2383 be32_to_cpu(hdr->runlength));
2384 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2385 /* FIXME: Support R-Data SNACK */
2386 pr_err("R-Data SNACK Not Supported.\n");
2387 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2388 buf);
2389 default:
2390 pr_err("Unknown SNACK type 0x%02x, protocol"
2391 " error.\n", hdr->flags & 0x0f);
2392 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2393 buf);
2394 }
2395
2396 return 0;
2397 }
2398
2399 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2400 {
2401 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2402 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2403 wait_for_completion_interruptible_timeout(
2404 &conn->rx_half_close_comp,
2405 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2406 }
2407 }
2408
2409 static int iscsit_handle_immediate_data(
2410 struct iscsi_cmd *cmd,
2411 struct iscsi_scsi_req *hdr,
2412 u32 length)
2413 {
2414 int iov_ret, rx_got = 0, rx_size = 0;
2415 u32 checksum, iov_count = 0, padding = 0;
2416 struct iscsi_conn *conn = cmd->conn;
2417 struct kvec *iov;
2418
2419 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2420 if (iov_ret < 0)
2421 return IMMEDIATE_DATA_CANNOT_RECOVER;
2422
2423 rx_size = length;
2424 iov_count = iov_ret;
2425 iov = &cmd->iov_data[0];
2426
2427 padding = ((-length) & 3);
2428 if (padding != 0) {
2429 iov[iov_count].iov_base = cmd->pad_bytes;
2430 iov[iov_count++].iov_len = padding;
2431 rx_size += padding;
2432 }
2433
2434 if (conn->conn_ops->DataDigest) {
2435 iov[iov_count].iov_base = &checksum;
2436 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2437 rx_size += ISCSI_CRC_LEN;
2438 }
2439
2440 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2441
2442 iscsit_unmap_iovec(cmd);
2443
2444 if (rx_got != rx_size) {
2445 iscsit_rx_thread_wait_for_tcp(conn);
2446 return IMMEDIATE_DATA_CANNOT_RECOVER;
2447 }
2448
2449 if (conn->conn_ops->DataDigest) {
2450 u32 data_crc;
2451
2452 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2453 cmd->write_data_done, length, padding,
2454 cmd->pad_bytes);
2455
2456 if (checksum != data_crc) {
2457 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2458 " does not match computed 0x%08x\n", checksum,
2459 data_crc);
2460
2461 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2462 pr_err("Unable to recover from"
2463 " Immediate Data digest failure while"
2464 " in ERL=0.\n");
2465 iscsit_reject_cmd(cmd,
2466 ISCSI_REASON_DATA_DIGEST_ERROR,
2467 (unsigned char *)hdr);
2468 return IMMEDIATE_DATA_CANNOT_RECOVER;
2469 } else {
2470 iscsit_reject_cmd(cmd,
2471 ISCSI_REASON_DATA_DIGEST_ERROR,
2472 (unsigned char *)hdr);
2473 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2474 }
2475 } else {
2476 pr_debug("Got CRC32C DataDigest 0x%08x for"
2477 " %u bytes of Immediate Data\n", checksum,
2478 length);
2479 }
2480 }
2481
2482 cmd->write_data_done += length;
2483
2484 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2485 spin_lock_bh(&cmd->istate_lock);
2486 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2487 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2488 spin_unlock_bh(&cmd->istate_lock);
2489 }
2490
2491 return IMMEDIATE_DATA_NORMAL_OPERATION;
2492 }
2493
2494 /*
2495 * Called with sess->conn_lock held.
2496 */
2497 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2498 with active network interface */
2499 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2500 {
2501 struct iscsi_cmd *cmd;
2502 struct iscsi_conn *conn_p;
2503 bool found = false;
2504
2505 /*
2506 * Only send a Asynchronous Message on connections whos network
2507 * interface is still functional.
2508 */
2509 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2510 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2511 iscsit_inc_conn_usage_count(conn_p);
2512 found = true;
2513 break;
2514 }
2515 }
2516
2517 if (!found)
2518 return;
2519
2520 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2521 if (!cmd) {
2522 iscsit_dec_conn_usage_count(conn_p);
2523 return;
2524 }
2525
2526 cmd->logout_cid = conn->cid;
2527 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2528 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2529
2530 spin_lock_bh(&conn_p->cmd_lock);
2531 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2532 spin_unlock_bh(&conn_p->cmd_lock);
2533
2534 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2535 iscsit_dec_conn_usage_count(conn_p);
2536 }
2537
2538 static int iscsit_send_conn_drop_async_message(
2539 struct iscsi_cmd *cmd,
2540 struct iscsi_conn *conn)
2541 {
2542 struct iscsi_async *hdr;
2543
2544 cmd->tx_size = ISCSI_HDR_LEN;
2545 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2546
2547 hdr = (struct iscsi_async *) cmd->pdu;
2548 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2549 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2550 cmd->init_task_tag = RESERVED_ITT;
2551 cmd->targ_xfer_tag = 0xFFFFFFFF;
2552 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2553 cmd->stat_sn = conn->stat_sn++;
2554 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2555 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2556 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2557 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2558 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2559 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2560 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2561
2562 if (conn->conn_ops->HeaderDigest) {
2563 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2564
2565 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2566 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2567
2568 cmd->tx_size += ISCSI_CRC_LEN;
2569 pr_debug("Attaching CRC32C HeaderDigest to"
2570 " Async Message 0x%08x\n", *header_digest);
2571 }
2572
2573 cmd->iov_misc[0].iov_base = cmd->pdu;
2574 cmd->iov_misc[0].iov_len = cmd->tx_size;
2575 cmd->iov_misc_count = 1;
2576
2577 pr_debug("Sending Connection Dropped Async Message StatSN:"
2578 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2579 cmd->logout_cid, conn->cid);
2580 return 0;
2581 }
2582
2583 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2584 {
2585 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2586 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2587 wait_for_completion_interruptible_timeout(
2588 &conn->tx_half_close_comp,
2589 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2590 }
2591 }
2592
2593 static void
2594 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2595 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2596 bool set_statsn)
2597 {
2598 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2599 hdr->flags = datain->flags;
2600 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2601 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2602 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2603 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2604 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2605 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2606 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2607 }
2608 }
2609 hton24(hdr->dlength, datain->length);
2610 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2611 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2612 (struct scsi_lun *)&hdr->lun);
2613 else
2614 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2615
2616 hdr->itt = cmd->init_task_tag;
2617
2618 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2619 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2620 else
2621 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2622 if (set_statsn)
2623 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2624 else
2625 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2626
2627 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2628 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2629 hdr->datasn = cpu_to_be32(datain->data_sn);
2630 hdr->offset = cpu_to_be32(datain->offset);
2631
2632 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2633 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2634 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2635 ntohl(hdr->offset), datain->length, conn->cid);
2636 }
2637
2638 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2639 {
2640 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2641 struct iscsi_datain datain;
2642 struct iscsi_datain_req *dr;
2643 struct kvec *iov;
2644 u32 iov_count = 0, tx_size = 0;
2645 int eodr = 0, ret, iov_ret;
2646 bool set_statsn = false;
2647
2648 memset(&datain, 0, sizeof(struct iscsi_datain));
2649 dr = iscsit_get_datain_values(cmd, &datain);
2650 if (!dr) {
2651 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2652 cmd->init_task_tag);
2653 return -1;
2654 }
2655 /*
2656 * Be paranoid and double check the logic for now.
2657 */
2658 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2659 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2660 " datain.length: %u exceeds cmd->data_length: %u\n",
2661 cmd->init_task_tag, datain.offset, datain.length,
2662 cmd->se_cmd.data_length);
2663 return -1;
2664 }
2665
2666 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2667 /*
2668 * Special case for successfully execution w/ both DATAIN
2669 * and Sense Data.
2670 */
2671 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2672 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2673 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2674 else {
2675 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2676 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2677 iscsit_increment_maxcmdsn(cmd, conn->sess);
2678 cmd->stat_sn = conn->stat_sn++;
2679 set_statsn = true;
2680 } else if (dr->dr_complete ==
2681 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2682 set_statsn = true;
2683 }
2684
2685 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2686
2687 iov = &cmd->iov_data[0];
2688 iov[iov_count].iov_base = cmd->pdu;
2689 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2690 tx_size += ISCSI_HDR_LEN;
2691
2692 if (conn->conn_ops->HeaderDigest) {
2693 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2694
2695 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2696 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2697
2698 iov[0].iov_len += ISCSI_CRC_LEN;
2699 tx_size += ISCSI_CRC_LEN;
2700
2701 pr_debug("Attaching CRC32 HeaderDigest"
2702 " for DataIN PDU 0x%08x\n", *header_digest);
2703 }
2704
2705 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2706 datain.offset, datain.length);
2707 if (iov_ret < 0)
2708 return -1;
2709
2710 iov_count += iov_ret;
2711 tx_size += datain.length;
2712
2713 cmd->padding = ((-datain.length) & 3);
2714 if (cmd->padding) {
2715 iov[iov_count].iov_base = cmd->pad_bytes;
2716 iov[iov_count++].iov_len = cmd->padding;
2717 tx_size += cmd->padding;
2718
2719 pr_debug("Attaching %u padding bytes\n",
2720 cmd->padding);
2721 }
2722 if (conn->conn_ops->DataDigest) {
2723 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2724 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2725
2726 iov[iov_count].iov_base = &cmd->data_crc;
2727 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2728 tx_size += ISCSI_CRC_LEN;
2729
2730 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2731 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2732 }
2733
2734 cmd->iov_data_count = iov_count;
2735 cmd->tx_size = tx_size;
2736
2737 /* sendpage is preferred but can't insert markers */
2738 if (!conn->conn_ops->IFMarker)
2739 ret = iscsit_fe_sendpage_sg(cmd, conn);
2740 else
2741 ret = iscsit_send_tx_data(cmd, conn, 0);
2742
2743 iscsit_unmap_iovec(cmd);
2744
2745 if (ret < 0) {
2746 iscsit_tx_thread_wait_for_tcp(conn);
2747 return ret;
2748 }
2749
2750 if (dr->dr_complete) {
2751 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2752 2 : 1;
2753 iscsit_free_datain_req(cmd, dr);
2754 }
2755
2756 return eodr;
2757 }
2758
2759 int
2760 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2761 struct iscsi_logout_rsp *hdr)
2762 {
2763 struct iscsi_conn *logout_conn = NULL;
2764 struct iscsi_conn_recovery *cr = NULL;
2765 struct iscsi_session *sess = conn->sess;
2766 /*
2767 * The actual shutting down of Sessions and/or Connections
2768 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2769 * is done in scsi_logout_post_handler().
2770 */
2771 switch (cmd->logout_reason) {
2772 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2773 pr_debug("iSCSI session logout successful, setting"
2774 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2775 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2776 break;
2777 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2778 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2779 break;
2780 /*
2781 * For CLOSECONNECTION logout requests carrying
2782 * a matching logout CID -> local CID, the reference
2783 * for the local CID will have been incremented in
2784 * iscsi_logout_closeconnection().
2785 *
2786 * For CLOSECONNECTION logout requests carrying
2787 * a different CID than the connection it arrived
2788 * on, the connection responding to cmd->logout_cid
2789 * is stopped in iscsit_logout_post_handler_diffcid().
2790 */
2791
2792 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2793 " successful.\n", cmd->logout_cid, conn->cid);
2794 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2795 break;
2796 case ISCSI_LOGOUT_REASON_RECOVERY:
2797 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2798 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2799 break;
2800 /*
2801 * If the connection is still active from our point of view
2802 * force connection recovery to occur.
2803 */
2804 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2805 cmd->logout_cid);
2806 if (logout_conn) {
2807 iscsit_connection_reinstatement_rcfr(logout_conn);
2808 iscsit_dec_conn_usage_count(logout_conn);
2809 }
2810
2811 cr = iscsit_get_inactive_connection_recovery_entry(
2812 conn->sess, cmd->logout_cid);
2813 if (!cr) {
2814 pr_err("Unable to locate CID: %hu for"
2815 " REMOVECONNFORRECOVERY Logout Request.\n",
2816 cmd->logout_cid);
2817 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2818 break;
2819 }
2820
2821 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2822
2823 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2824 " for recovery for CID: %hu on CID: %hu successful.\n",
2825 cmd->logout_cid, conn->cid);
2826 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2827 break;
2828 default:
2829 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2830 cmd->logout_reason);
2831 return -1;
2832 }
2833
2834 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2835 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2836 hdr->response = cmd->logout_response;
2837 hdr->itt = cmd->init_task_tag;
2838 cmd->stat_sn = conn->stat_sn++;
2839 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2840
2841 iscsit_increment_maxcmdsn(cmd, conn->sess);
2842 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2843 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2844
2845 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2846 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2847 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2848 cmd->logout_cid, conn->cid);
2849
2850 return 0;
2851 }
2852 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2853
2854 static int
2855 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2856 {
2857 struct kvec *iov;
2858 int niov = 0, tx_size, rc;
2859
2860 rc = iscsit_build_logout_rsp(cmd, conn,
2861 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2862 if (rc < 0)
2863 return rc;
2864
2865 tx_size = ISCSI_HDR_LEN;
2866 iov = &cmd->iov_misc[0];
2867 iov[niov].iov_base = cmd->pdu;
2868 iov[niov++].iov_len = ISCSI_HDR_LEN;
2869
2870 if (conn->conn_ops->HeaderDigest) {
2871 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2872
2873 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2874 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2875
2876 iov[0].iov_len += ISCSI_CRC_LEN;
2877 tx_size += ISCSI_CRC_LEN;
2878 pr_debug("Attaching CRC32C HeaderDigest to"
2879 " Logout Response 0x%08x\n", *header_digest);
2880 }
2881 cmd->iov_misc_count = niov;
2882 cmd->tx_size = tx_size;
2883
2884 return 0;
2885 }
2886
2887 void
2888 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2889 struct iscsi_nopin *hdr, bool nopout_response)
2890 {
2891 hdr->opcode = ISCSI_OP_NOOP_IN;
2892 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2893 hton24(hdr->dlength, cmd->buf_ptr_size);
2894 if (nopout_response)
2895 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2896 hdr->itt = cmd->init_task_tag;
2897 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2898 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2899 conn->stat_sn;
2900 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2901
2902 if (nopout_response)
2903 iscsit_increment_maxcmdsn(cmd, conn->sess);
2904
2905 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2906 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2907
2908 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2909 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2910 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2911 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2912 }
2913 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2914
2915 /*
2916 * Unsolicited NOPIN, either requesting a response or not.
2917 */
2918 static int iscsit_send_unsolicited_nopin(
2919 struct iscsi_cmd *cmd,
2920 struct iscsi_conn *conn,
2921 int want_response)
2922 {
2923 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2924 int tx_size = ISCSI_HDR_LEN, ret;
2925
2926 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2927
2928 if (conn->conn_ops->HeaderDigest) {
2929 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2930
2931 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2932 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2933
2934 tx_size += ISCSI_CRC_LEN;
2935 pr_debug("Attaching CRC32C HeaderDigest to"
2936 " NopIN 0x%08x\n", *header_digest);
2937 }
2938
2939 cmd->iov_misc[0].iov_base = cmd->pdu;
2940 cmd->iov_misc[0].iov_len = tx_size;
2941 cmd->iov_misc_count = 1;
2942 cmd->tx_size = tx_size;
2943
2944 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2945 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2946
2947 ret = iscsit_send_tx_data(cmd, conn, 1);
2948 if (ret < 0) {
2949 iscsit_tx_thread_wait_for_tcp(conn);
2950 return ret;
2951 }
2952
2953 spin_lock_bh(&cmd->istate_lock);
2954 cmd->i_state = want_response ?
2955 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2956 spin_unlock_bh(&cmd->istate_lock);
2957
2958 return 0;
2959 }
2960
2961 static int
2962 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2963 {
2964 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2965 struct kvec *iov;
2966 u32 padding = 0;
2967 int niov = 0, tx_size;
2968
2969 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2970
2971 tx_size = ISCSI_HDR_LEN;
2972 iov = &cmd->iov_misc[0];
2973 iov[niov].iov_base = cmd->pdu;
2974 iov[niov++].iov_len = ISCSI_HDR_LEN;
2975
2976 if (conn->conn_ops->HeaderDigest) {
2977 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2978
2979 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2980 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2981
2982 iov[0].iov_len += ISCSI_CRC_LEN;
2983 tx_size += ISCSI_CRC_LEN;
2984 pr_debug("Attaching CRC32C HeaderDigest"
2985 " to NopIn 0x%08x\n", *header_digest);
2986 }
2987
2988 /*
2989 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2990 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2991 */
2992 if (cmd->buf_ptr_size) {
2993 iov[niov].iov_base = cmd->buf_ptr;
2994 iov[niov++].iov_len = cmd->buf_ptr_size;
2995 tx_size += cmd->buf_ptr_size;
2996
2997 pr_debug("Echoing back %u bytes of ping"
2998 " data.\n", cmd->buf_ptr_size);
2999
3000 padding = ((-cmd->buf_ptr_size) & 3);
3001 if (padding != 0) {
3002 iov[niov].iov_base = &cmd->pad_bytes;
3003 iov[niov++].iov_len = padding;
3004 tx_size += padding;
3005 pr_debug("Attaching %u additional"
3006 " padding bytes.\n", padding);
3007 }
3008 if (conn->conn_ops->DataDigest) {
3009 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3010 cmd->buf_ptr, cmd->buf_ptr_size,
3011 padding, (u8 *)&cmd->pad_bytes,
3012 (u8 *)&cmd->data_crc);
3013
3014 iov[niov].iov_base = &cmd->data_crc;
3015 iov[niov++].iov_len = ISCSI_CRC_LEN;
3016 tx_size += ISCSI_CRC_LEN;
3017 pr_debug("Attached DataDigest for %u"
3018 " bytes of ping data, CRC 0x%08x\n",
3019 cmd->buf_ptr_size, cmd->data_crc);
3020 }
3021 }
3022
3023 cmd->iov_misc_count = niov;
3024 cmd->tx_size = tx_size;
3025
3026 return 0;
3027 }
3028
3029 static int iscsit_send_r2t(
3030 struct iscsi_cmd *cmd,
3031 struct iscsi_conn *conn)
3032 {
3033 int tx_size = 0;
3034 struct iscsi_r2t *r2t;
3035 struct iscsi_r2t_rsp *hdr;
3036 int ret;
3037
3038 r2t = iscsit_get_r2t_from_list(cmd);
3039 if (!r2t)
3040 return -1;
3041
3042 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3043 memset(hdr, 0, ISCSI_HDR_LEN);
3044 hdr->opcode = ISCSI_OP_R2T;
3045 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3046 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3047 (struct scsi_lun *)&hdr->lun);
3048 hdr->itt = cmd->init_task_tag;
3049 spin_lock_bh(&conn->sess->ttt_lock);
3050 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3051 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3052 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3053 spin_unlock_bh(&conn->sess->ttt_lock);
3054 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3055 hdr->statsn = cpu_to_be32(conn->stat_sn);
3056 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3057 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3058 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3059 hdr->data_offset = cpu_to_be32(r2t->offset);
3060 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3061
3062 cmd->iov_misc[0].iov_base = cmd->pdu;
3063 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3064 tx_size += ISCSI_HDR_LEN;
3065
3066 if (conn->conn_ops->HeaderDigest) {
3067 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3068
3069 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3070 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3071
3072 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3073 tx_size += ISCSI_CRC_LEN;
3074 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3075 " PDU 0x%08x\n", *header_digest);
3076 }
3077
3078 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3079 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3080 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3081 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3082 r2t->offset, r2t->xfer_len, conn->cid);
3083
3084 cmd->iov_misc_count = 1;
3085 cmd->tx_size = tx_size;
3086
3087 spin_lock_bh(&cmd->r2t_lock);
3088 r2t->sent_r2t = 1;
3089 spin_unlock_bh(&cmd->r2t_lock);
3090
3091 ret = iscsit_send_tx_data(cmd, conn, 1);
3092 if (ret < 0) {
3093 iscsit_tx_thread_wait_for_tcp(conn);
3094 return ret;
3095 }
3096
3097 spin_lock_bh(&cmd->dataout_timeout_lock);
3098 iscsit_start_dataout_timer(cmd, conn);
3099 spin_unlock_bh(&cmd->dataout_timeout_lock);
3100
3101 return 0;
3102 }
3103
3104 /*
3105 * @recovery: If called from iscsi_task_reassign_complete_write() for
3106 * connection recovery.
3107 */
3108 int iscsit_build_r2ts_for_cmd(
3109 struct iscsi_conn *conn,
3110 struct iscsi_cmd *cmd,
3111 bool recovery)
3112 {
3113 int first_r2t = 1;
3114 u32 offset = 0, xfer_len = 0;
3115
3116 spin_lock_bh(&cmd->r2t_lock);
3117 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3118 spin_unlock_bh(&cmd->r2t_lock);
3119 return 0;
3120 }
3121
3122 if (conn->sess->sess_ops->DataSequenceInOrder &&
3123 !recovery)
3124 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3125
3126 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3127 if (conn->sess->sess_ops->DataSequenceInOrder) {
3128 offset = cmd->r2t_offset;
3129
3130 if (first_r2t && recovery) {
3131 int new_data_end = offset +
3132 conn->sess->sess_ops->MaxBurstLength -
3133 cmd->next_burst_len;
3134
3135 if (new_data_end > cmd->se_cmd.data_length)
3136 xfer_len = cmd->se_cmd.data_length - offset;
3137 else
3138 xfer_len =
3139 conn->sess->sess_ops->MaxBurstLength -
3140 cmd->next_burst_len;
3141 } else {
3142 int new_data_end = offset +
3143 conn->sess->sess_ops->MaxBurstLength;
3144
3145 if (new_data_end > cmd->se_cmd.data_length)
3146 xfer_len = cmd->se_cmd.data_length - offset;
3147 else
3148 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3149 }
3150 cmd->r2t_offset += xfer_len;
3151
3152 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3153 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3154 } else {
3155 struct iscsi_seq *seq;
3156
3157 seq = iscsit_get_seq_holder_for_r2t(cmd);
3158 if (!seq) {
3159 spin_unlock_bh(&cmd->r2t_lock);
3160 return -1;
3161 }
3162
3163 offset = seq->offset;
3164 xfer_len = seq->xfer_len;
3165
3166 if (cmd->seq_send_order == cmd->seq_count)
3167 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3168 }
3169 cmd->outstanding_r2ts++;
3170 first_r2t = 0;
3171
3172 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3173 spin_unlock_bh(&cmd->r2t_lock);
3174 return -1;
3175 }
3176
3177 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3178 break;
3179 }
3180 spin_unlock_bh(&cmd->r2t_lock);
3181
3182 return 0;
3183 }
3184
3185 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3186 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3187 {
3188 if (inc_stat_sn)
3189 cmd->stat_sn = conn->stat_sn++;
3190
3191 atomic_long_inc(&conn->sess->rsp_pdus);
3192
3193 memset(hdr, 0, ISCSI_HDR_LEN);
3194 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3195 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3196 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3197 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3198 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3199 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3200 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3201 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3202 }
3203 hdr->response = cmd->iscsi_response;
3204 hdr->cmd_status = cmd->se_cmd.scsi_status;
3205 hdr->itt = cmd->init_task_tag;
3206 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3207
3208 iscsit_increment_maxcmdsn(cmd, conn->sess);
3209 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3210 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3211
3212 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3213 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3214 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3215 cmd->se_cmd.scsi_status, conn->cid);
3216 }
3217 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3218
3219 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3220 {
3221 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3222 struct kvec *iov;
3223 u32 padding = 0, tx_size = 0;
3224 int iov_count = 0;
3225 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3226
3227 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3228
3229 iov = &cmd->iov_misc[0];
3230 iov[iov_count].iov_base = cmd->pdu;
3231 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3232 tx_size += ISCSI_HDR_LEN;
3233
3234 /*
3235 * Attach SENSE DATA payload to iSCSI Response PDU
3236 */
3237 if (cmd->se_cmd.sense_buffer &&
3238 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3239 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3240 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3241 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3242
3243 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3244 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3245 iov[iov_count].iov_base = cmd->sense_buffer;
3246 iov[iov_count++].iov_len =
3247 (cmd->se_cmd.scsi_sense_length + padding);
3248 tx_size += cmd->se_cmd.scsi_sense_length;
3249
3250 if (padding) {
3251 memset(cmd->sense_buffer +
3252 cmd->se_cmd.scsi_sense_length, 0, padding);
3253 tx_size += padding;
3254 pr_debug("Adding %u bytes of padding to"
3255 " SENSE.\n", padding);
3256 }
3257
3258 if (conn->conn_ops->DataDigest) {
3259 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3260 cmd->sense_buffer,
3261 (cmd->se_cmd.scsi_sense_length + padding),
3262 0, NULL, (u8 *)&cmd->data_crc);
3263
3264 iov[iov_count].iov_base = &cmd->data_crc;
3265 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3266 tx_size += ISCSI_CRC_LEN;
3267
3268 pr_debug("Attaching CRC32 DataDigest for"
3269 " SENSE, %u bytes CRC 0x%08x\n",
3270 (cmd->se_cmd.scsi_sense_length + padding),
3271 cmd->data_crc);
3272 }
3273
3274 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3275 " Response PDU\n",
3276 cmd->se_cmd.scsi_sense_length);
3277 }
3278
3279 if (conn->conn_ops->HeaderDigest) {
3280 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3281
3282 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3283 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3284
3285 iov[0].iov_len += ISCSI_CRC_LEN;
3286 tx_size += ISCSI_CRC_LEN;
3287 pr_debug("Attaching CRC32 HeaderDigest for Response"
3288 " PDU 0x%08x\n", *header_digest);
3289 }
3290
3291 cmd->iov_misc_count = iov_count;
3292 cmd->tx_size = tx_size;
3293
3294 return 0;
3295 }
3296
3297 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3298 {
3299 switch (se_tmr->response) {
3300 case TMR_FUNCTION_COMPLETE:
3301 return ISCSI_TMF_RSP_COMPLETE;
3302 case TMR_TASK_DOES_NOT_EXIST:
3303 return ISCSI_TMF_RSP_NO_TASK;
3304 case TMR_LUN_DOES_NOT_EXIST:
3305 return ISCSI_TMF_RSP_NO_LUN;
3306 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3307 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3308 case TMR_FUNCTION_REJECTED:
3309 default:
3310 return ISCSI_TMF_RSP_REJECTED;
3311 }
3312 }
3313
3314 void
3315 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3316 struct iscsi_tm_rsp *hdr)
3317 {
3318 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3319
3320 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3321 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3322 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3323 hdr->itt = cmd->init_task_tag;
3324 cmd->stat_sn = conn->stat_sn++;
3325 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3326
3327 iscsit_increment_maxcmdsn(cmd, conn->sess);
3328 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3329 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3330
3331 pr_debug("Built Task Management Response ITT: 0x%08x,"
3332 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3333 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3334 }
3335 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3336
3337 static int
3338 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3339 {
3340 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3341 u32 tx_size = 0;
3342
3343 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3344
3345 cmd->iov_misc[0].iov_base = cmd->pdu;
3346 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3347 tx_size += ISCSI_HDR_LEN;
3348
3349 if (conn->conn_ops->HeaderDigest) {
3350 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3351
3352 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3353 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3354
3355 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3356 tx_size += ISCSI_CRC_LEN;
3357 pr_debug("Attaching CRC32 HeaderDigest for Task"
3358 " Mgmt Response PDU 0x%08x\n", *header_digest);
3359 }
3360
3361 cmd->iov_misc_count = 1;
3362 cmd->tx_size = tx_size;
3363
3364 return 0;
3365 }
3366
3367 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3368 {
3369 bool ret = false;
3370
3371 if (np->np_sockaddr.ss_family == AF_INET6) {
3372 const struct sockaddr_in6 sin6 = {
3373 .sin6_addr = IN6ADDR_ANY_INIT };
3374 struct sockaddr_in6 *sock_in6 =
3375 (struct sockaddr_in6 *)&np->np_sockaddr;
3376
3377 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3378 sin6.sin6_addr.s6_addr, 16))
3379 ret = true;
3380 } else {
3381 struct sockaddr_in * sock_in =
3382 (struct sockaddr_in *)&np->np_sockaddr;
3383
3384 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3385 ret = true;
3386 }
3387
3388 return ret;
3389 }
3390
3391 #define SENDTARGETS_BUF_LIMIT 32768U
3392
3393 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3394 {
3395 char *payload = NULL;
3396 struct iscsi_conn *conn = cmd->conn;
3397 struct iscsi_portal_group *tpg;
3398 struct iscsi_tiqn *tiqn;
3399 struct iscsi_tpg_np *tpg_np;
3400 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3401 int target_name_printed;
3402 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3403 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3404
3405 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3406 SENDTARGETS_BUF_LIMIT);
3407
3408 payload = kzalloc(buffer_len, GFP_KERNEL);
3409 if (!payload) {
3410 pr_err("Unable to allocate memory for sendtargets"
3411 " response.\n");
3412 return -ENOMEM;
3413 }
3414 /*
3415 * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
3416 * explicit case..
3417 */
3418 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
3419 text_ptr = strchr(text_in, '=');
3420 if (!text_ptr) {
3421 pr_err("Unable to locate '=' string in text_in:"
3422 " %s\n", text_in);
3423 kfree(payload);
3424 return -EINVAL;
3425 }
3426 /*
3427 * Skip over '=' character..
3428 */
3429 text_ptr += 1;
3430 }
3431
3432 spin_lock(&tiqn_lock);
3433 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3434 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
3435 strcmp(tiqn->tiqn, text_ptr)) {
3436 continue;
3437 }
3438
3439 target_name_printed = 0;
3440
3441 spin_lock(&tiqn->tiqn_tpg_lock);
3442 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3443
3444 /* If demo_mode_discovery=0 and generate_node_acls=0
3445 * (demo mode dislabed) do not return
3446 * TargetName+TargetAddress unless a NodeACL exists.
3447 */
3448
3449 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3450 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3451 (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3452 cmd->conn->sess->sess_ops->InitiatorName))) {
3453 continue;
3454 }
3455
3456 spin_lock(&tpg->tpg_state_lock);
3457 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3458 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3459 spin_unlock(&tpg->tpg_state_lock);
3460 continue;
3461 }
3462 spin_unlock(&tpg->tpg_state_lock);
3463
3464 spin_lock(&tpg->tpg_np_lock);
3465 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3466 tpg_np_list) {
3467 struct iscsi_np *np = tpg_np->tpg_np;
3468 bool inaddr_any = iscsit_check_inaddr_any(np);
3469
3470 if (!target_name_printed) {
3471 len = sprintf(buf, "TargetName=%s",
3472 tiqn->tiqn);
3473 len += 1;
3474
3475 if ((len + payload_len) > buffer_len) {
3476 spin_unlock(&tpg->tpg_np_lock);
3477 spin_unlock(&tiqn->tiqn_tpg_lock);
3478 end_of_buf = 1;
3479 goto eob;
3480 }
3481 memcpy(payload + payload_len, buf, len);
3482 payload_len += len;
3483 target_name_printed = 1;
3484 }
3485
3486 len = sprintf(buf, "TargetAddress="
3487 "%s:%hu,%hu",
3488 (inaddr_any == false) ?
3489 np->np_ip : conn->local_ip,
3490 (inaddr_any == false) ?
3491 np->np_port : conn->local_port,
3492 tpg->tpgt);
3493 len += 1;
3494
3495 if ((len + payload_len) > buffer_len) {
3496 spin_unlock(&tpg->tpg_np_lock);
3497 spin_unlock(&tiqn->tiqn_tpg_lock);
3498 end_of_buf = 1;
3499 goto eob;
3500 }
3501 memcpy(payload + payload_len, buf, len);
3502 payload_len += len;
3503 }
3504 spin_unlock(&tpg->tpg_np_lock);
3505 }
3506 spin_unlock(&tiqn->tiqn_tpg_lock);
3507 eob:
3508 if (end_of_buf)
3509 break;
3510
3511 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
3512 break;
3513 }
3514 spin_unlock(&tiqn_lock);
3515
3516 cmd->buf_ptr = payload;
3517
3518 return payload_len;
3519 }
3520
3521 int
3522 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3523 struct iscsi_text_rsp *hdr)
3524 {
3525 int text_length, padding;
3526
3527 text_length = iscsit_build_sendtargets_response(cmd);
3528 if (text_length < 0)
3529 return text_length;
3530
3531 hdr->opcode = ISCSI_OP_TEXT_RSP;
3532 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3533 padding = ((-text_length) & 3);
3534 hton24(hdr->dlength, text_length);
3535 hdr->itt = cmd->init_task_tag;
3536 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3537 cmd->stat_sn = conn->stat_sn++;
3538 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3539
3540 iscsit_increment_maxcmdsn(cmd, conn->sess);
3541 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3542 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3543
3544 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3545 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3546 text_length, conn->cid);
3547
3548 return text_length + padding;
3549 }
3550 EXPORT_SYMBOL(iscsit_build_text_rsp);
3551
3552 /*
3553 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3554 * MaxRecvDataSegmentLength.
3555 */
3556 static int iscsit_send_text_rsp(
3557 struct iscsi_cmd *cmd,
3558 struct iscsi_conn *conn)
3559 {
3560 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3561 struct kvec *iov;
3562 u32 tx_size = 0;
3563 int text_length, iov_count = 0, rc;
3564
3565 rc = iscsit_build_text_rsp(cmd, conn, hdr);
3566 if (rc < 0)
3567 return rc;
3568
3569 text_length = rc;
3570 iov = &cmd->iov_misc[0];
3571 iov[iov_count].iov_base = cmd->pdu;
3572 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3573 iov[iov_count].iov_base = cmd->buf_ptr;
3574 iov[iov_count++].iov_len = text_length;
3575
3576 tx_size += (ISCSI_HDR_LEN + text_length);
3577
3578 if (conn->conn_ops->HeaderDigest) {
3579 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3580
3581 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3582 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3583
3584 iov[0].iov_len += ISCSI_CRC_LEN;
3585 tx_size += ISCSI_CRC_LEN;
3586 pr_debug("Attaching CRC32 HeaderDigest for"
3587 " Text Response PDU 0x%08x\n", *header_digest);
3588 }
3589
3590 if (conn->conn_ops->DataDigest) {
3591 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3592 cmd->buf_ptr, text_length,
3593 0, NULL, (u8 *)&cmd->data_crc);
3594
3595 iov[iov_count].iov_base = &cmd->data_crc;
3596 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3597 tx_size += ISCSI_CRC_LEN;
3598
3599 pr_debug("Attaching DataDigest for %u bytes of text"
3600 " data, CRC 0x%08x\n", text_length,
3601 cmd->data_crc);
3602 }
3603
3604 cmd->iov_misc_count = iov_count;
3605 cmd->tx_size = tx_size;
3606
3607 return 0;
3608 }
3609
3610 void
3611 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3612 struct iscsi_reject *hdr)
3613 {
3614 hdr->opcode = ISCSI_OP_REJECT;
3615 hdr->reason = cmd->reject_reason;
3616 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3617 hton24(hdr->dlength, ISCSI_HDR_LEN);
3618 hdr->ffffffff = cpu_to_be32(0xffffffff);
3619 cmd->stat_sn = conn->stat_sn++;
3620 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3621 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3622 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3623
3624 }
3625 EXPORT_SYMBOL(iscsit_build_reject);
3626
3627 static int iscsit_send_reject(
3628 struct iscsi_cmd *cmd,
3629 struct iscsi_conn *conn)
3630 {
3631 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3632 struct kvec *iov;
3633 u32 iov_count = 0, tx_size;
3634
3635 iscsit_build_reject(cmd, conn, hdr);
3636
3637 iov = &cmd->iov_misc[0];
3638 iov[iov_count].iov_base = cmd->pdu;
3639 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3640 iov[iov_count].iov_base = cmd->buf_ptr;
3641 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3642
3643 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3644
3645 if (conn->conn_ops->HeaderDigest) {
3646 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3647
3648 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3649 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3650
3651 iov[0].iov_len += ISCSI_CRC_LEN;
3652 tx_size += ISCSI_CRC_LEN;
3653 pr_debug("Attaching CRC32 HeaderDigest for"
3654 " REJECT PDU 0x%08x\n", *header_digest);
3655 }
3656
3657 if (conn->conn_ops->DataDigest) {
3658 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3659 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3660
3661 iov[iov_count].iov_base = &cmd->data_crc;
3662 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3663 tx_size += ISCSI_CRC_LEN;
3664 pr_debug("Attaching CRC32 DataDigest for REJECT"
3665 " PDU 0x%08x\n", cmd->data_crc);
3666 }
3667
3668 cmd->iov_misc_count = iov_count;
3669 cmd->tx_size = tx_size;
3670
3671 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3672 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3673
3674 return 0;
3675 }
3676
3677 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3678 {
3679 struct iscsi_thread_set *ts = conn->thread_set;
3680 int ord, cpu;
3681 /*
3682 * thread_id is assigned from iscsit_global->ts_bitmap from
3683 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3684 *
3685 * Here we use thread_id to determine which CPU that this
3686 * iSCSI connection's iscsi_thread_set will be scheduled to
3687 * execute upon.
3688 */
3689 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3690 for_each_online_cpu(cpu) {
3691 if (ord-- == 0) {
3692 cpumask_set_cpu(cpu, conn->conn_cpumask);
3693 return;
3694 }
3695 }
3696 /*
3697 * This should never be reached..
3698 */
3699 dump_stack();
3700 cpumask_setall(conn->conn_cpumask);
3701 }
3702
3703 static inline void iscsit_thread_check_cpumask(
3704 struct iscsi_conn *conn,
3705 struct task_struct *p,
3706 int mode)
3707 {
3708 char buf[128];
3709 /*
3710 * mode == 1 signals iscsi_target_tx_thread() usage.
3711 * mode == 0 signals iscsi_target_rx_thread() usage.
3712 */
3713 if (mode == 1) {
3714 if (!conn->conn_tx_reset_cpumask)
3715 return;
3716 conn->conn_tx_reset_cpumask = 0;
3717 } else {
3718 if (!conn->conn_rx_reset_cpumask)
3719 return;
3720 conn->conn_rx_reset_cpumask = 0;
3721 }
3722 /*
3723 * Update the CPU mask for this single kthread so that
3724 * both TX and RX kthreads are scheduled to run on the
3725 * same CPU.
3726 */
3727 memset(buf, 0, 128);
3728 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3729 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3730 }
3731
3732 static int
3733 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3734 {
3735 int ret;
3736
3737 switch (state) {
3738 case ISTATE_SEND_R2T:
3739 ret = iscsit_send_r2t(cmd, conn);
3740 if (ret < 0)
3741 goto err;
3742 break;
3743 case ISTATE_REMOVE:
3744 spin_lock_bh(&conn->cmd_lock);
3745 list_del_init(&cmd->i_conn_node);
3746 spin_unlock_bh(&conn->cmd_lock);
3747
3748 iscsit_free_cmd(cmd, false);
3749 break;
3750 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3751 iscsit_mod_nopin_response_timer(conn);
3752 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3753 if (ret < 0)
3754 goto err;
3755 break;
3756 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3757 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3758 if (ret < 0)
3759 goto err;
3760 break;
3761 default:
3762 pr_err("Unknown Opcode: 0x%02x ITT:"
3763 " 0x%08x, i_state: %d on CID: %hu\n",
3764 cmd->iscsi_opcode, cmd->init_task_tag, state,
3765 conn->cid);
3766 goto err;
3767 }
3768
3769 return 0;
3770
3771 err:
3772 return -1;
3773 }
3774
3775 static int
3776 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3777 {
3778 struct iscsit_transport *t = conn->conn_transport;
3779 struct iscsi_queue_req *qr;
3780 struct iscsi_cmd *cmd;
3781 u8 state;
3782 int ret;
3783
3784 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3785 atomic_set(&conn->check_immediate_queue, 0);
3786 cmd = qr->cmd;
3787 state = qr->state;
3788 kmem_cache_free(lio_qr_cache, qr);
3789
3790 ret = t->iscsit_immediate_queue(conn, cmd, state);
3791 if (ret < 0)
3792 return ret;
3793 }
3794
3795 return 0;
3796 }
3797
3798 static int
3799 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3800 {
3801 int ret;
3802
3803 check_rsp_state:
3804 switch (state) {
3805 case ISTATE_SEND_DATAIN:
3806 ret = iscsit_send_datain(cmd, conn);
3807 if (ret < 0)
3808 goto err;
3809 else if (!ret)
3810 /* more drs */
3811 goto check_rsp_state;
3812 else if (ret == 1) {
3813 /* all done */
3814 spin_lock_bh(&cmd->istate_lock);
3815 cmd->i_state = ISTATE_SENT_STATUS;
3816 spin_unlock_bh(&cmd->istate_lock);
3817
3818 if (atomic_read(&conn->check_immediate_queue))
3819 return 1;
3820
3821 return 0;
3822 } else if (ret == 2) {
3823 /* Still must send status,
3824 SCF_TRANSPORT_TASK_SENSE was set */
3825 spin_lock_bh(&cmd->istate_lock);
3826 cmd->i_state = ISTATE_SEND_STATUS;
3827 spin_unlock_bh(&cmd->istate_lock);
3828 state = ISTATE_SEND_STATUS;
3829 goto check_rsp_state;
3830 }
3831
3832 break;
3833 case ISTATE_SEND_STATUS:
3834 case ISTATE_SEND_STATUS_RECOVERY:
3835 ret = iscsit_send_response(cmd, conn);
3836 break;
3837 case ISTATE_SEND_LOGOUTRSP:
3838 ret = iscsit_send_logout(cmd, conn);
3839 break;
3840 case ISTATE_SEND_ASYNCMSG:
3841 ret = iscsit_send_conn_drop_async_message(
3842 cmd, conn);
3843 break;
3844 case ISTATE_SEND_NOPIN:
3845 ret = iscsit_send_nopin(cmd, conn);
3846 break;
3847 case ISTATE_SEND_REJECT:
3848 ret = iscsit_send_reject(cmd, conn);
3849 break;
3850 case ISTATE_SEND_TASKMGTRSP:
3851 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3852 if (ret != 0)
3853 break;
3854 ret = iscsit_tmr_post_handler(cmd, conn);
3855 if (ret != 0)
3856 iscsit_fall_back_to_erl0(conn->sess);
3857 break;
3858 case ISTATE_SEND_TEXTRSP:
3859 ret = iscsit_send_text_rsp(cmd, conn);
3860 break;
3861 default:
3862 pr_err("Unknown Opcode: 0x%02x ITT:"
3863 " 0x%08x, i_state: %d on CID: %hu\n",
3864 cmd->iscsi_opcode, cmd->init_task_tag,
3865 state, conn->cid);
3866 goto err;
3867 }
3868 if (ret < 0)
3869 goto err;
3870
3871 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3872 iscsit_tx_thread_wait_for_tcp(conn);
3873 iscsit_unmap_iovec(cmd);
3874 goto err;
3875 }
3876 iscsit_unmap_iovec(cmd);
3877
3878 switch (state) {
3879 case ISTATE_SEND_LOGOUTRSP:
3880 if (!iscsit_logout_post_handler(cmd, conn))
3881 goto restart;
3882 /* fall through */
3883 case ISTATE_SEND_STATUS:
3884 case ISTATE_SEND_ASYNCMSG:
3885 case ISTATE_SEND_NOPIN:
3886 case ISTATE_SEND_STATUS_RECOVERY:
3887 case ISTATE_SEND_TEXTRSP:
3888 case ISTATE_SEND_TASKMGTRSP:
3889 case ISTATE_SEND_REJECT:
3890 spin_lock_bh(&cmd->istate_lock);
3891 cmd->i_state = ISTATE_SENT_STATUS;
3892 spin_unlock_bh(&cmd->istate_lock);
3893 break;
3894 default:
3895 pr_err("Unknown Opcode: 0x%02x ITT:"
3896 " 0x%08x, i_state: %d on CID: %hu\n",
3897 cmd->iscsi_opcode, cmd->init_task_tag,
3898 cmd->i_state, conn->cid);
3899 goto err;
3900 }
3901
3902 if (atomic_read(&conn->check_immediate_queue))
3903 return 1;
3904
3905 return 0;
3906
3907 err:
3908 return -1;
3909 restart:
3910 return -EAGAIN;
3911 }
3912
3913 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3914 {
3915 struct iscsit_transport *t = conn->conn_transport;
3916 struct iscsi_queue_req *qr;
3917 struct iscsi_cmd *cmd;
3918 u8 state;
3919 int ret;
3920
3921 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3922 cmd = qr->cmd;
3923 state = qr->state;
3924 kmem_cache_free(lio_qr_cache, qr);
3925
3926 ret = t->iscsit_response_queue(conn, cmd, state);
3927 if (ret == 1 || ret < 0)
3928 return ret;
3929 }
3930
3931 return 0;
3932 }
3933
3934 int iscsi_target_tx_thread(void *arg)
3935 {
3936 int ret = 0;
3937 struct iscsi_conn *conn;
3938 struct iscsi_thread_set *ts = arg;
3939 /*
3940 * Allow ourselves to be interrupted by SIGINT so that a
3941 * connection recovery / failure event can be triggered externally.
3942 */
3943 allow_signal(SIGINT);
3944
3945 restart:
3946 conn = iscsi_tx_thread_pre_handler(ts);
3947 if (!conn)
3948 goto out;
3949
3950 ret = 0;
3951
3952 while (!kthread_should_stop()) {
3953 /*
3954 * Ensure that both TX and RX per connection kthreads
3955 * are scheduled to run on the same CPU.
3956 */
3957 iscsit_thread_check_cpumask(conn, current, 1);
3958
3959 wait_event_interruptible(conn->queues_wq,
3960 !iscsit_conn_all_queues_empty(conn) ||
3961 ts->status == ISCSI_THREAD_SET_RESET);
3962
3963 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3964 signal_pending(current))
3965 goto transport_err;
3966
3967 get_immediate:
3968 ret = iscsit_handle_immediate_queue(conn);
3969 if (ret < 0)
3970 goto transport_err;
3971
3972 ret = iscsit_handle_response_queue(conn);
3973 if (ret == 1)
3974 goto get_immediate;
3975 else if (ret == -EAGAIN)
3976 goto restart;
3977 else if (ret < 0)
3978 goto transport_err;
3979 }
3980
3981 transport_err:
3982 iscsit_take_action_for_connection_exit(conn);
3983 goto restart;
3984 out:
3985 return 0;
3986 }
3987
3988 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3989 {
3990 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3991 struct iscsi_cmd *cmd;
3992 int ret = 0;
3993
3994 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3995 case ISCSI_OP_SCSI_CMD:
3996 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3997 if (!cmd)
3998 goto reject;
3999
4000 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
4001 break;
4002 case ISCSI_OP_SCSI_DATA_OUT:
4003 ret = iscsit_handle_data_out(conn, buf);
4004 break;
4005 case ISCSI_OP_NOOP_OUT:
4006 cmd = NULL;
4007 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4008 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4009 if (!cmd)
4010 goto reject;
4011 }
4012 ret = iscsit_handle_nop_out(conn, cmd, buf);
4013 break;
4014 case ISCSI_OP_SCSI_TMFUNC:
4015 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4016 if (!cmd)
4017 goto reject;
4018
4019 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4020 break;
4021 case ISCSI_OP_TEXT:
4022 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4023 if (!cmd)
4024 goto reject;
4025
4026 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4027 break;
4028 case ISCSI_OP_LOGOUT:
4029 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4030 if (!cmd)
4031 goto reject;
4032
4033 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4034 if (ret > 0)
4035 wait_for_completion_timeout(&conn->conn_logout_comp,
4036 SECONDS_FOR_LOGOUT_COMP * HZ);
4037 break;
4038 case ISCSI_OP_SNACK:
4039 ret = iscsit_handle_snack(conn, buf);
4040 break;
4041 default:
4042 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4043 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4044 pr_err("Cannot recover from unknown"
4045 " opcode while ERL=0, closing iSCSI connection.\n");
4046 return -1;
4047 }
4048 if (!conn->conn_ops->OFMarker) {
4049 pr_err("Unable to recover from unknown"
4050 " opcode while OFMarker=No, closing iSCSI"
4051 " connection.\n");
4052 return -1;
4053 }
4054 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4055 pr_err("Unable to recover from unknown"
4056 " opcode, closing iSCSI connection.\n");
4057 return -1;
4058 }
4059 break;
4060 }
4061
4062 return ret;
4063 reject:
4064 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4065 }
4066
4067 int iscsi_target_rx_thread(void *arg)
4068 {
4069 int ret;
4070 u8 buffer[ISCSI_HDR_LEN], opcode;
4071 u32 checksum = 0, digest = 0;
4072 struct iscsi_conn *conn = NULL;
4073 struct iscsi_thread_set *ts = arg;
4074 struct kvec iov;
4075 /*
4076 * Allow ourselves to be interrupted by SIGINT so that a
4077 * connection recovery / failure event can be triggered externally.
4078 */
4079 allow_signal(SIGINT);
4080
4081 restart:
4082 conn = iscsi_rx_thread_pre_handler(ts);
4083 if (!conn)
4084 goto out;
4085
4086 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4087 struct completion comp;
4088 int rc;
4089
4090 init_completion(&comp);
4091 rc = wait_for_completion_interruptible(&comp);
4092 if (rc < 0)
4093 goto transport_err;
4094
4095 goto out;
4096 }
4097
4098 while (!kthread_should_stop()) {
4099 /*
4100 * Ensure that both TX and RX per connection kthreads
4101 * are scheduled to run on the same CPU.
4102 */
4103 iscsit_thread_check_cpumask(conn, current, 0);
4104
4105 memset(buffer, 0, ISCSI_HDR_LEN);
4106 memset(&iov, 0, sizeof(struct kvec));
4107
4108 iov.iov_base = buffer;
4109 iov.iov_len = ISCSI_HDR_LEN;
4110
4111 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4112 if (ret != ISCSI_HDR_LEN) {
4113 iscsit_rx_thread_wait_for_tcp(conn);
4114 goto transport_err;
4115 }
4116
4117 if (conn->conn_ops->HeaderDigest) {
4118 iov.iov_base = &digest;
4119 iov.iov_len = ISCSI_CRC_LEN;
4120
4121 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4122 if (ret != ISCSI_CRC_LEN) {
4123 iscsit_rx_thread_wait_for_tcp(conn);
4124 goto transport_err;
4125 }
4126
4127 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4128 buffer, ISCSI_HDR_LEN,
4129 0, NULL, (u8 *)&checksum);
4130
4131 if (digest != checksum) {
4132 pr_err("HeaderDigest CRC32C failed,"
4133 " received 0x%08x, computed 0x%08x\n",
4134 digest, checksum);
4135 /*
4136 * Set the PDU to 0xff so it will intentionally
4137 * hit default in the switch below.
4138 */
4139 memset(buffer, 0xff, ISCSI_HDR_LEN);
4140 atomic_long_inc(&conn->sess->conn_digest_errors);
4141 } else {
4142 pr_debug("Got HeaderDigest CRC32C"
4143 " 0x%08x\n", checksum);
4144 }
4145 }
4146
4147 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4148 goto transport_err;
4149
4150 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4151
4152 if (conn->sess->sess_ops->SessionType &&
4153 ((!(opcode & ISCSI_OP_TEXT)) ||
4154 (!(opcode & ISCSI_OP_LOGOUT)))) {
4155 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4156 " while in Discovery Session, rejecting.\n", opcode);
4157 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4158 buffer);
4159 goto transport_err;
4160 }
4161
4162 ret = iscsi_target_rx_opcode(conn, buffer);
4163 if (ret < 0)
4164 goto transport_err;
4165 }
4166
4167 transport_err:
4168 if (!signal_pending(current))
4169 atomic_set(&conn->transport_failed, 1);
4170 iscsit_take_action_for_connection_exit(conn);
4171 goto restart;
4172 out:
4173 return 0;
4174 }
4175
4176 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4177 {
4178 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4179 struct iscsi_session *sess = conn->sess;
4180 /*
4181 * We expect this function to only ever be called from either RX or TX
4182 * thread context via iscsit_close_connection() once the other context
4183 * has been reset -> returned sleeping pre-handler state.
4184 */
4185 spin_lock_bh(&conn->cmd_lock);
4186 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4187
4188 list_del_init(&cmd->i_conn_node);
4189 spin_unlock_bh(&conn->cmd_lock);
4190
4191 iscsit_increment_maxcmdsn(cmd, sess);
4192
4193 iscsit_free_cmd(cmd, true);
4194
4195 spin_lock_bh(&conn->cmd_lock);
4196 }
4197 spin_unlock_bh(&conn->cmd_lock);
4198 }
4199
4200 static void iscsit_stop_timers_for_cmds(
4201 struct iscsi_conn *conn)
4202 {
4203 struct iscsi_cmd *cmd;
4204
4205 spin_lock_bh(&conn->cmd_lock);
4206 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4207 if (cmd->data_direction == DMA_TO_DEVICE)
4208 iscsit_stop_dataout_timer(cmd);
4209 }
4210 spin_unlock_bh(&conn->cmd_lock);
4211 }
4212
4213 int iscsit_close_connection(
4214 struct iscsi_conn *conn)
4215 {
4216 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4217 struct iscsi_session *sess = conn->sess;
4218
4219 pr_debug("Closing iSCSI connection CID %hu on SID:"
4220 " %u\n", conn->cid, sess->sid);
4221 /*
4222 * Always up conn_logout_comp just in case the RX Thread is sleeping
4223 * and the logout response never got sent because the connection
4224 * failed.
4225 */
4226 complete(&conn->conn_logout_comp);
4227
4228 iscsi_release_thread_set(conn);
4229
4230 iscsit_stop_timers_for_cmds(conn);
4231 iscsit_stop_nopin_response_timer(conn);
4232 iscsit_stop_nopin_timer(conn);
4233
4234 if (conn->conn_transport->iscsit_wait_conn)
4235 conn->conn_transport->iscsit_wait_conn(conn);
4236
4237 iscsit_free_queue_reqs_for_conn(conn);
4238
4239 /*
4240 * During Connection recovery drop unacknowledged out of order
4241 * commands for this connection, and prepare the other commands
4242 * for realligence.
4243 *
4244 * During normal operation clear the out of order commands (but
4245 * do not free the struct iscsi_ooo_cmdsn's) and release all
4246 * struct iscsi_cmds.
4247 */
4248 if (atomic_read(&conn->connection_recovery)) {
4249 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4250 iscsit_prepare_cmds_for_realligance(conn);
4251 } else {
4252 iscsit_clear_ooo_cmdsns_for_conn(conn);
4253 iscsit_release_commands_from_conn(conn);
4254 }
4255
4256 /*
4257 * Handle decrementing session or connection usage count if
4258 * a logout response was not able to be sent because the
4259 * connection failed. Fall back to Session Recovery here.
4260 */
4261 if (atomic_read(&conn->conn_logout_remove)) {
4262 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4263 iscsit_dec_conn_usage_count(conn);
4264 iscsit_dec_session_usage_count(sess);
4265 }
4266 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4267 iscsit_dec_conn_usage_count(conn);
4268
4269 atomic_set(&conn->conn_logout_remove, 0);
4270 atomic_set(&sess->session_reinstatement, 0);
4271 atomic_set(&sess->session_fall_back_to_erl0, 1);
4272 }
4273
4274 spin_lock_bh(&sess->conn_lock);
4275 list_del(&conn->conn_list);
4276
4277 /*
4278 * Attempt to let the Initiator know this connection failed by
4279 * sending an Connection Dropped Async Message on another
4280 * active connection.
4281 */
4282 if (atomic_read(&conn->connection_recovery))
4283 iscsit_build_conn_drop_async_message(conn);
4284
4285 spin_unlock_bh(&sess->conn_lock);
4286
4287 /*
4288 * If connection reinstatement is being performed on this connection,
4289 * up the connection reinstatement semaphore that is being blocked on
4290 * in iscsit_cause_connection_reinstatement().
4291 */
4292 spin_lock_bh(&conn->state_lock);
4293 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4294 spin_unlock_bh(&conn->state_lock);
4295 complete(&conn->conn_wait_comp);
4296 wait_for_completion(&conn->conn_post_wait_comp);
4297 spin_lock_bh(&conn->state_lock);
4298 }
4299
4300 /*
4301 * If connection reinstatement is being performed on this connection
4302 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4303 * connection wait rcfr semaphore that is being blocked on
4304 * an iscsit_connection_reinstatement_rcfr().
4305 */
4306 if (atomic_read(&conn->connection_wait_rcfr)) {
4307 spin_unlock_bh(&conn->state_lock);
4308 complete(&conn->conn_wait_rcfr_comp);
4309 wait_for_completion(&conn->conn_post_wait_comp);
4310 spin_lock_bh(&conn->state_lock);
4311 }
4312 atomic_set(&conn->connection_reinstatement, 1);
4313 spin_unlock_bh(&conn->state_lock);
4314
4315 /*
4316 * If any other processes are accessing this connection pointer we
4317 * must wait until they have completed.
4318 */
4319 iscsit_check_conn_usage_count(conn);
4320
4321 if (conn->conn_rx_hash.tfm)
4322 crypto_free_hash(conn->conn_rx_hash.tfm);
4323 if (conn->conn_tx_hash.tfm)
4324 crypto_free_hash(conn->conn_tx_hash.tfm);
4325
4326 if (conn->conn_cpumask)
4327 free_cpumask_var(conn->conn_cpumask);
4328
4329 kfree(conn->conn_ops);
4330 conn->conn_ops = NULL;
4331
4332 if (conn->sock)
4333 sock_release(conn->sock);
4334
4335 if (conn->conn_transport->iscsit_free_conn)
4336 conn->conn_transport->iscsit_free_conn(conn);
4337
4338 iscsit_put_transport(conn->conn_transport);
4339
4340 conn->thread_set = NULL;
4341
4342 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4343 conn->conn_state = TARG_CONN_STATE_FREE;
4344 kfree(conn);
4345
4346 spin_lock_bh(&sess->conn_lock);
4347 atomic_dec(&sess->nconn);
4348 pr_debug("Decremented iSCSI connection count to %hu from node:"
4349 " %s\n", atomic_read(&sess->nconn),
4350 sess->sess_ops->InitiatorName);
4351 /*
4352 * Make sure that if one connection fails in an non ERL=2 iSCSI
4353 * Session that they all fail.
4354 */
4355 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4356 !atomic_read(&sess->session_logout))
4357 atomic_set(&sess->session_fall_back_to_erl0, 1);
4358
4359 /*
4360 * If this was not the last connection in the session, and we are
4361 * performing session reinstatement or falling back to ERL=0, call
4362 * iscsit_stop_session() without sleeping to shutdown the other
4363 * active connections.
4364 */
4365 if (atomic_read(&sess->nconn)) {
4366 if (!atomic_read(&sess->session_reinstatement) &&
4367 !atomic_read(&sess->session_fall_back_to_erl0)) {
4368 spin_unlock_bh(&sess->conn_lock);
4369 return 0;
4370 }
4371 if (!atomic_read(&sess->session_stop_active)) {
4372 atomic_set(&sess->session_stop_active, 1);
4373 spin_unlock_bh(&sess->conn_lock);
4374 iscsit_stop_session(sess, 0, 0);
4375 return 0;
4376 }
4377 spin_unlock_bh(&sess->conn_lock);
4378 return 0;
4379 }
4380
4381 /*
4382 * If this was the last connection in the session and one of the
4383 * following is occurring:
4384 *
4385 * Session Reinstatement is not being performed, and are falling back
4386 * to ERL=0 call iscsit_close_session().
4387 *
4388 * Session Logout was requested. iscsit_close_session() will be called
4389 * elsewhere.
4390 *
4391 * Session Continuation is not being performed, start the Time2Retain
4392 * handler and check if sleep_on_sess_wait_sem is active.
4393 */
4394 if (!atomic_read(&sess->session_reinstatement) &&
4395 atomic_read(&sess->session_fall_back_to_erl0)) {
4396 spin_unlock_bh(&sess->conn_lock);
4397 target_put_session(sess->se_sess);
4398
4399 return 0;
4400 } else if (atomic_read(&sess->session_logout)) {
4401 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4402 sess->session_state = TARG_SESS_STATE_FREE;
4403 spin_unlock_bh(&sess->conn_lock);
4404
4405 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4406 complete(&sess->session_wait_comp);
4407
4408 return 0;
4409 } else {
4410 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4411 sess->session_state = TARG_SESS_STATE_FAILED;
4412
4413 if (!atomic_read(&sess->session_continuation)) {
4414 spin_unlock_bh(&sess->conn_lock);
4415 iscsit_start_time2retain_handler(sess);
4416 } else
4417 spin_unlock_bh(&sess->conn_lock);
4418
4419 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4420 complete(&sess->session_wait_comp);
4421
4422 return 0;
4423 }
4424 spin_unlock_bh(&sess->conn_lock);
4425
4426 return 0;
4427 }
4428
4429 int iscsit_close_session(struct iscsi_session *sess)
4430 {
4431 struct iscsi_portal_group *tpg = sess->tpg;
4432 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4433
4434 if (atomic_read(&sess->nconn)) {
4435 pr_err("%d connection(s) still exist for iSCSI session"
4436 " to %s\n", atomic_read(&sess->nconn),
4437 sess->sess_ops->InitiatorName);
4438 BUG();
4439 }
4440
4441 spin_lock_bh(&se_tpg->session_lock);
4442 atomic_set(&sess->session_logout, 1);
4443 atomic_set(&sess->session_reinstatement, 1);
4444 iscsit_stop_time2retain_timer(sess);
4445 spin_unlock_bh(&se_tpg->session_lock);
4446
4447 /*
4448 * transport_deregister_session_configfs() will clear the
4449 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4450 * can be setting it again with __transport_register_session() in
4451 * iscsi_post_login_handler() again after the iscsit_stop_session()
4452 * completes in iscsi_np context.
4453 */
4454 transport_deregister_session_configfs(sess->se_sess);
4455
4456 /*
4457 * If any other processes are accessing this session pointer we must
4458 * wait until they have completed. If we are in an interrupt (the
4459 * time2retain handler) and contain and active session usage count we
4460 * restart the timer and exit.
4461 */
4462 if (!in_interrupt()) {
4463 if (iscsit_check_session_usage_count(sess) == 1)
4464 iscsit_stop_session(sess, 1, 1);
4465 } else {
4466 if (iscsit_check_session_usage_count(sess) == 2) {
4467 atomic_set(&sess->session_logout, 0);
4468 iscsit_start_time2retain_handler(sess);
4469 return 0;
4470 }
4471 }
4472
4473 transport_deregister_session(sess->se_sess);
4474
4475 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4476 iscsit_free_connection_recovery_entires(sess);
4477
4478 iscsit_free_all_ooo_cmdsns(sess);
4479
4480 spin_lock_bh(&se_tpg->session_lock);
4481 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4482 sess->session_state = TARG_SESS_STATE_FREE;
4483 pr_debug("Released iSCSI session from node: %s\n",
4484 sess->sess_ops->InitiatorName);
4485 tpg->nsessions--;
4486 if (tpg->tpg_tiqn)
4487 tpg->tpg_tiqn->tiqn_nsessions--;
4488
4489 pr_debug("Decremented number of active iSCSI Sessions on"
4490 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4491
4492 spin_lock(&sess_idr_lock);
4493 idr_remove(&sess_idr, sess->session_index);
4494 spin_unlock(&sess_idr_lock);
4495
4496 kfree(sess->sess_ops);
4497 sess->sess_ops = NULL;
4498 spin_unlock_bh(&se_tpg->session_lock);
4499
4500 kfree(sess);
4501 return 0;
4502 }
4503
4504 static void iscsit_logout_post_handler_closesession(
4505 struct iscsi_conn *conn)
4506 {
4507 struct iscsi_session *sess = conn->sess;
4508
4509 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4510 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4511
4512 atomic_set(&conn->conn_logout_remove, 0);
4513 complete(&conn->conn_logout_comp);
4514
4515 iscsit_dec_conn_usage_count(conn);
4516 iscsit_stop_session(sess, 1, 1);
4517 iscsit_dec_session_usage_count(sess);
4518 target_put_session(sess->se_sess);
4519 }
4520
4521 static void iscsit_logout_post_handler_samecid(
4522 struct iscsi_conn *conn)
4523 {
4524 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4525 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4526
4527 atomic_set(&conn->conn_logout_remove, 0);
4528 complete(&conn->conn_logout_comp);
4529
4530 iscsit_cause_connection_reinstatement(conn, 1);
4531 iscsit_dec_conn_usage_count(conn);
4532 }
4533
4534 static void iscsit_logout_post_handler_diffcid(
4535 struct iscsi_conn *conn,
4536 u16 cid)
4537 {
4538 struct iscsi_conn *l_conn;
4539 struct iscsi_session *sess = conn->sess;
4540
4541 if (!sess)
4542 return;
4543
4544 spin_lock_bh(&sess->conn_lock);
4545 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4546 if (l_conn->cid == cid) {
4547 iscsit_inc_conn_usage_count(l_conn);
4548 break;
4549 }
4550 }
4551 spin_unlock_bh(&sess->conn_lock);
4552
4553 if (!l_conn)
4554 return;
4555
4556 if (l_conn->sock)
4557 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4558
4559 spin_lock_bh(&l_conn->state_lock);
4560 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4561 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4562 spin_unlock_bh(&l_conn->state_lock);
4563
4564 iscsit_cause_connection_reinstatement(l_conn, 1);
4565 iscsit_dec_conn_usage_count(l_conn);
4566 }
4567
4568 /*
4569 * Return of 0 causes the TX thread to restart.
4570 */
4571 int iscsit_logout_post_handler(
4572 struct iscsi_cmd *cmd,
4573 struct iscsi_conn *conn)
4574 {
4575 int ret = 0;
4576
4577 switch (cmd->logout_reason) {
4578 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4579 switch (cmd->logout_response) {
4580 case ISCSI_LOGOUT_SUCCESS:
4581 case ISCSI_LOGOUT_CLEANUP_FAILED:
4582 default:
4583 iscsit_logout_post_handler_closesession(conn);
4584 break;
4585 }
4586 ret = 0;
4587 break;
4588 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4589 if (conn->cid == cmd->logout_cid) {
4590 switch (cmd->logout_response) {
4591 case ISCSI_LOGOUT_SUCCESS:
4592 case ISCSI_LOGOUT_CLEANUP_FAILED:
4593 default:
4594 iscsit_logout_post_handler_samecid(conn);
4595 break;
4596 }
4597 ret = 0;
4598 } else {
4599 switch (cmd->logout_response) {
4600 case ISCSI_LOGOUT_SUCCESS:
4601 iscsit_logout_post_handler_diffcid(conn,
4602 cmd->logout_cid);
4603 break;
4604 case ISCSI_LOGOUT_CID_NOT_FOUND:
4605 case ISCSI_LOGOUT_CLEANUP_FAILED:
4606 default:
4607 break;
4608 }
4609 ret = 1;
4610 }
4611 break;
4612 case ISCSI_LOGOUT_REASON_RECOVERY:
4613 switch (cmd->logout_response) {
4614 case ISCSI_LOGOUT_SUCCESS:
4615 case ISCSI_LOGOUT_CID_NOT_FOUND:
4616 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4617 case ISCSI_LOGOUT_CLEANUP_FAILED:
4618 default:
4619 break;
4620 }
4621 ret = 1;
4622 break;
4623 default:
4624 break;
4625
4626 }
4627 return ret;
4628 }
4629 EXPORT_SYMBOL(iscsit_logout_post_handler);
4630
4631 void iscsit_fail_session(struct iscsi_session *sess)
4632 {
4633 struct iscsi_conn *conn;
4634
4635 spin_lock_bh(&sess->conn_lock);
4636 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4637 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4638 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4639 }
4640 spin_unlock_bh(&sess->conn_lock);
4641
4642 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4643 sess->session_state = TARG_SESS_STATE_FAILED;
4644 }
4645
4646 int iscsit_free_session(struct iscsi_session *sess)
4647 {
4648 u16 conn_count = atomic_read(&sess->nconn);
4649 struct iscsi_conn *conn, *conn_tmp = NULL;
4650 int is_last;
4651
4652 spin_lock_bh(&sess->conn_lock);
4653 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4654
4655 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4656 conn_list) {
4657 if (conn_count == 0)
4658 break;
4659
4660 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4661 is_last = 1;
4662 } else {
4663 iscsit_inc_conn_usage_count(conn_tmp);
4664 is_last = 0;
4665 }
4666 iscsit_inc_conn_usage_count(conn);
4667
4668 spin_unlock_bh(&sess->conn_lock);
4669 iscsit_cause_connection_reinstatement(conn, 1);
4670 spin_lock_bh(&sess->conn_lock);
4671
4672 iscsit_dec_conn_usage_count(conn);
4673 if (is_last == 0)
4674 iscsit_dec_conn_usage_count(conn_tmp);
4675
4676 conn_count--;
4677 }
4678
4679 if (atomic_read(&sess->nconn)) {
4680 spin_unlock_bh(&sess->conn_lock);
4681 wait_for_completion(&sess->session_wait_comp);
4682 } else
4683 spin_unlock_bh(&sess->conn_lock);
4684
4685 target_put_session(sess->se_sess);
4686 return 0;
4687 }
4688
4689 void iscsit_stop_session(
4690 struct iscsi_session *sess,
4691 int session_sleep,
4692 int connection_sleep)
4693 {
4694 u16 conn_count = atomic_read(&sess->nconn);
4695 struct iscsi_conn *conn, *conn_tmp = NULL;
4696 int is_last;
4697
4698 spin_lock_bh(&sess->conn_lock);
4699 if (session_sleep)
4700 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4701
4702 if (connection_sleep) {
4703 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4704 conn_list) {
4705 if (conn_count == 0)
4706 break;
4707
4708 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4709 is_last = 1;
4710 } else {
4711 iscsit_inc_conn_usage_count(conn_tmp);
4712 is_last = 0;
4713 }
4714 iscsit_inc_conn_usage_count(conn);
4715
4716 spin_unlock_bh(&sess->conn_lock);
4717 iscsit_cause_connection_reinstatement(conn, 1);
4718 spin_lock_bh(&sess->conn_lock);
4719
4720 iscsit_dec_conn_usage_count(conn);
4721 if (is_last == 0)
4722 iscsit_dec_conn_usage_count(conn_tmp);
4723 conn_count--;
4724 }
4725 } else {
4726 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4727 iscsit_cause_connection_reinstatement(conn, 0);
4728 }
4729
4730 if (session_sleep && atomic_read(&sess->nconn)) {
4731 spin_unlock_bh(&sess->conn_lock);
4732 wait_for_completion(&sess->session_wait_comp);
4733 } else
4734 spin_unlock_bh(&sess->conn_lock);
4735 }
4736
4737 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4738 {
4739 struct iscsi_session *sess;
4740 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4741 struct se_session *se_sess, *se_sess_tmp;
4742 int session_count = 0;
4743
4744 spin_lock_bh(&se_tpg->session_lock);
4745 if (tpg->nsessions && !force) {
4746 spin_unlock_bh(&se_tpg->session_lock);
4747 return -1;
4748 }
4749
4750 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4751 sess_list) {
4752 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4753
4754 spin_lock(&sess->conn_lock);
4755 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4756 atomic_read(&sess->session_logout) ||
4757 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4758 spin_unlock(&sess->conn_lock);
4759 continue;
4760 }
4761 atomic_set(&sess->session_reinstatement, 1);
4762 spin_unlock(&sess->conn_lock);
4763 spin_unlock_bh(&se_tpg->session_lock);
4764
4765 iscsit_free_session(sess);
4766 spin_lock_bh(&se_tpg->session_lock);
4767
4768 session_count++;
4769 }
4770 spin_unlock_bh(&se_tpg->session_lock);
4771
4772 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4773 " Group: %hu\n", session_count, tpg->tpgt);
4774 return 0;
4775 }
4776
4777 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4778 MODULE_VERSION("4.1.x");
4779 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4780 MODULE_LICENSE("GPL");
4781
4782 module_init(iscsi_target_init_module);
4783 module_exit(iscsi_target_cleanup_module);
Linux kernel - Deliverables
This page took 0.202172 seconds and 5 git commands to generate.