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Merge tag 'dma-buf-for-4.0-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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 <target/iscsi/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 <target/iscsi/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 && (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) {
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 iscsit_unregister_transport(&iscsi_target_transport);
613 kmem_cache_destroy(lio_r2t_cache);
614 ooo_out:
615 kmem_cache_destroy(lio_ooo_cache);
616 dr_out:
617 kmem_cache_destroy(lio_dr_cache);
618 qr_out:
619 kmem_cache_destroy(lio_qr_cache);
620 ts_out2:
621 iscsi_deallocate_thread_sets();
622 ts_out1:
623 iscsi_thread_set_free();
624 configfs_out:
625 iscsi_target_deregister_configfs();
626 out:
627 kfree(iscsit_global);
628 return -ENOMEM;
629 }
630
631 static void __exit iscsi_target_cleanup_module(void)
632 {
633 iscsi_deallocate_thread_sets();
634 iscsi_thread_set_free();
635 iscsit_release_discovery_tpg();
636 iscsit_unregister_transport(&iscsi_target_transport);
637 kmem_cache_destroy(lio_qr_cache);
638 kmem_cache_destroy(lio_dr_cache);
639 kmem_cache_destroy(lio_ooo_cache);
640 kmem_cache_destroy(lio_r2t_cache);
641
642 iscsi_target_deregister_configfs();
643
644 kfree(iscsit_global);
645 }
646
647 static int iscsit_add_reject(
648 struct iscsi_conn *conn,
649 u8 reason,
650 unsigned char *buf)
651 {
652 struct iscsi_cmd *cmd;
653
654 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
655 if (!cmd)
656 return -1;
657
658 cmd->iscsi_opcode = ISCSI_OP_REJECT;
659 cmd->reject_reason = reason;
660
661 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
662 if (!cmd->buf_ptr) {
663 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
664 iscsit_free_cmd(cmd, false);
665 return -1;
666 }
667
668 spin_lock_bh(&conn->cmd_lock);
669 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
670 spin_unlock_bh(&conn->cmd_lock);
671
672 cmd->i_state = ISTATE_SEND_REJECT;
673 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
674
675 return -1;
676 }
677
678 static int iscsit_add_reject_from_cmd(
679 struct iscsi_cmd *cmd,
680 u8 reason,
681 bool add_to_conn,
682 unsigned char *buf)
683 {
684 struct iscsi_conn *conn;
685
686 if (!cmd->conn) {
687 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
688 cmd->init_task_tag);
689 return -1;
690 }
691 conn = cmd->conn;
692
693 cmd->iscsi_opcode = ISCSI_OP_REJECT;
694 cmd->reject_reason = reason;
695
696 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
697 if (!cmd->buf_ptr) {
698 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
699 iscsit_free_cmd(cmd, false);
700 return -1;
701 }
702
703 if (add_to_conn) {
704 spin_lock_bh(&conn->cmd_lock);
705 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
706 spin_unlock_bh(&conn->cmd_lock);
707 }
708
709 cmd->i_state = ISTATE_SEND_REJECT;
710 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
711 /*
712 * Perform the kref_put now if se_cmd has already been setup by
713 * scsit_setup_scsi_cmd()
714 */
715 if (cmd->se_cmd.se_tfo != NULL) {
716 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
717 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
718 }
719 return -1;
720 }
721
722 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
723 unsigned char *buf)
724 {
725 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
726 }
727
728 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
729 {
730 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
731 }
732
733 /*
734 * Map some portion of the allocated scatterlist to an iovec, suitable for
735 * kernel sockets to copy data in/out.
736 */
737 static int iscsit_map_iovec(
738 struct iscsi_cmd *cmd,
739 struct kvec *iov,
740 u32 data_offset,
741 u32 data_length)
742 {
743 u32 i = 0;
744 struct scatterlist *sg;
745 unsigned int page_off;
746
747 /*
748 * We know each entry in t_data_sg contains a page.
749 */
750 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
751 page_off = (data_offset % PAGE_SIZE);
752
753 cmd->first_data_sg = sg;
754 cmd->first_data_sg_off = page_off;
755
756 while (data_length) {
757 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
758
759 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
760 iov[i].iov_len = cur_len;
761
762 data_length -= cur_len;
763 page_off = 0;
764 sg = sg_next(sg);
765 i++;
766 }
767
768 cmd->kmapped_nents = i;
769
770 return i;
771 }
772
773 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
774 {
775 u32 i;
776 struct scatterlist *sg;
777
778 sg = cmd->first_data_sg;
779
780 for (i = 0; i < cmd->kmapped_nents; i++)
781 kunmap(sg_page(&sg[i]));
782 }
783
784 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
785 {
786 LIST_HEAD(ack_list);
787 struct iscsi_cmd *cmd, *cmd_p;
788
789 conn->exp_statsn = exp_statsn;
790
791 if (conn->sess->sess_ops->RDMAExtensions)
792 return;
793
794 spin_lock_bh(&conn->cmd_lock);
795 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
796 spin_lock(&cmd->istate_lock);
797 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
798 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
799 cmd->i_state = ISTATE_REMOVE;
800 spin_unlock(&cmd->istate_lock);
801 list_move_tail(&cmd->i_conn_node, &ack_list);
802 continue;
803 }
804 spin_unlock(&cmd->istate_lock);
805 }
806 spin_unlock_bh(&conn->cmd_lock);
807
808 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
809 list_del_init(&cmd->i_conn_node);
810 iscsit_free_cmd(cmd, false);
811 }
812 }
813
814 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
815 {
816 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
817
818 iov_count += ISCSI_IOV_DATA_BUFFER;
819
820 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
821 if (!cmd->iov_data) {
822 pr_err("Unable to allocate cmd->iov_data\n");
823 return -ENOMEM;
824 }
825
826 cmd->orig_iov_data_count = iov_count;
827 return 0;
828 }
829
830 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
831 unsigned char *buf)
832 {
833 int data_direction, payload_length;
834 struct iscsi_scsi_req *hdr;
835 int iscsi_task_attr;
836 int sam_task_attr;
837
838 atomic_long_inc(&conn->sess->cmd_pdus);
839
840 hdr = (struct iscsi_scsi_req *) buf;
841 payload_length = ntoh24(hdr->dlength);
842
843 /* FIXME; Add checks for AdditionalHeaderSegment */
844
845 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
846 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
847 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
848 " not set. Bad iSCSI Initiator.\n");
849 return iscsit_add_reject_cmd(cmd,
850 ISCSI_REASON_BOOKMARK_INVALID, buf);
851 }
852
853 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
854 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
855 /*
856 * From RFC-3720 Section 10.3.1:
857 *
858 * "Either or both of R and W MAY be 1 when either the
859 * Expected Data Transfer Length and/or Bidirectional Read
860 * Expected Data Transfer Length are 0"
861 *
862 * For this case, go ahead and clear the unnecssary bits
863 * to avoid any confusion with ->data_direction.
864 */
865 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
866 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
867
868 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
869 " set when Expected Data Transfer Length is 0 for"
870 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
871 }
872
873 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
874 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
875 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
876 " MUST be set if Expected Data Transfer Length is not 0."
877 " Bad iSCSI Initiator\n");
878 return iscsit_add_reject_cmd(cmd,
879 ISCSI_REASON_BOOKMARK_INVALID, buf);
880 }
881
882 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
883 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
884 pr_err("Bidirectional operations not supported!\n");
885 return iscsit_add_reject_cmd(cmd,
886 ISCSI_REASON_BOOKMARK_INVALID, buf);
887 }
888
889 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
890 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
891 " Scsi Command PDU.\n");
892 return iscsit_add_reject_cmd(cmd,
893 ISCSI_REASON_BOOKMARK_INVALID, buf);
894 }
895
896 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
897 pr_err("ImmediateData=No but DataSegmentLength=%u,"
898 " protocol error.\n", payload_length);
899 return iscsit_add_reject_cmd(cmd,
900 ISCSI_REASON_PROTOCOL_ERROR, buf);
901 }
902
903 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
904 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
905 pr_err("Expected Data Transfer Length and Length of"
906 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
907 " bit is not set protocol error\n");
908 return iscsit_add_reject_cmd(cmd,
909 ISCSI_REASON_PROTOCOL_ERROR, buf);
910 }
911
912 if (payload_length > be32_to_cpu(hdr->data_length)) {
913 pr_err("DataSegmentLength: %u is greater than"
914 " EDTL: %u, protocol error.\n", payload_length,
915 hdr->data_length);
916 return iscsit_add_reject_cmd(cmd,
917 ISCSI_REASON_PROTOCOL_ERROR, buf);
918 }
919
920 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
921 pr_err("DataSegmentLength: %u is greater than"
922 " MaxXmitDataSegmentLength: %u, protocol error.\n",
923 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
924 return iscsit_add_reject_cmd(cmd,
925 ISCSI_REASON_PROTOCOL_ERROR, buf);
926 }
927
928 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
929 pr_err("DataSegmentLength: %u is greater than"
930 " FirstBurstLength: %u, protocol error.\n",
931 payload_length, conn->sess->sess_ops->FirstBurstLength);
932 return iscsit_add_reject_cmd(cmd,
933 ISCSI_REASON_BOOKMARK_INVALID, buf);
934 }
935
936 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
937 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
938 DMA_NONE;
939
940 cmd->data_direction = data_direction;
941 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
942 /*
943 * Figure out the SAM Task Attribute for the incoming SCSI CDB
944 */
945 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
946 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
947 sam_task_attr = TCM_SIMPLE_TAG;
948 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
949 sam_task_attr = TCM_ORDERED_TAG;
950 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
951 sam_task_attr = TCM_HEAD_TAG;
952 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
953 sam_task_attr = TCM_ACA_TAG;
954 else {
955 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
956 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
957 sam_task_attr = TCM_SIMPLE_TAG;
958 }
959
960 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
961 cmd->i_state = ISTATE_NEW_CMD;
962 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
963 cmd->immediate_data = (payload_length) ? 1 : 0;
964 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
965 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
966 if (cmd->unsolicited_data)
967 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
968
969 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
970 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
971 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
972 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
973 cmd->targ_xfer_tag = 0xFFFFFFFF;
974 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
975 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
976 cmd->first_burst_len = payload_length;
977
978 if (!conn->sess->sess_ops->RDMAExtensions &&
979 cmd->data_direction == DMA_FROM_DEVICE) {
980 struct iscsi_datain_req *dr;
981
982 dr = iscsit_allocate_datain_req();
983 if (!dr)
984 return iscsit_add_reject_cmd(cmd,
985 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
986
987 iscsit_attach_datain_req(cmd, dr);
988 }
989
990 /*
991 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
992 */
993 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
994 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
995 cmd->data_direction, sam_task_attr,
996 cmd->sense_buffer + 2);
997
998 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
999 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1000 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1001 conn->cid);
1002
1003 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1004
1005 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1006 scsilun_to_int(&hdr->lun));
1007 if (cmd->sense_reason)
1008 goto attach_cmd;
1009
1010 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1011 if (cmd->sense_reason) {
1012 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1013 return iscsit_add_reject_cmd(cmd,
1014 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1015 }
1016
1017 goto attach_cmd;
1018 }
1019
1020 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1021 return iscsit_add_reject_cmd(cmd,
1022 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1023 }
1024
1025 attach_cmd:
1026 spin_lock_bh(&conn->cmd_lock);
1027 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1028 spin_unlock_bh(&conn->cmd_lock);
1029 /*
1030 * Check if we need to delay processing because of ALUA
1031 * Active/NonOptimized primary access state..
1032 */
1033 core_alua_check_nonop_delay(&cmd->se_cmd);
1034
1035 return 0;
1036 }
1037 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1038
1039 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1040 {
1041 iscsit_set_dataout_sequence_values(cmd);
1042
1043 spin_lock_bh(&cmd->dataout_timeout_lock);
1044 iscsit_start_dataout_timer(cmd, cmd->conn);
1045 spin_unlock_bh(&cmd->dataout_timeout_lock);
1046 }
1047 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1048
1049 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1050 struct iscsi_scsi_req *hdr)
1051 {
1052 int cmdsn_ret = 0;
1053 /*
1054 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1055 * the Immediate Bit is not set, and no Immediate
1056 * Data is attached.
1057 *
1058 * A PDU/CmdSN carrying Immediate Data can only
1059 * be processed after the DataCRC has passed.
1060 * If the DataCRC fails, the CmdSN MUST NOT
1061 * be acknowledged. (See below)
1062 */
1063 if (!cmd->immediate_data) {
1064 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1065 (unsigned char *)hdr, hdr->cmdsn);
1066 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1067 return -1;
1068 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1069 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1070 return 0;
1071 }
1072 }
1073
1074 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1075
1076 /*
1077 * If no Immediate Data is attached, it's OK to return now.
1078 */
1079 if (!cmd->immediate_data) {
1080 if (!cmd->sense_reason && cmd->unsolicited_data)
1081 iscsit_set_unsoliticed_dataout(cmd);
1082 if (!cmd->sense_reason)
1083 return 0;
1084
1085 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1086 return 0;
1087 }
1088
1089 /*
1090 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1091 * execution. These exceptions are processed in CmdSN order using
1092 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1093 */
1094 if (cmd->sense_reason) {
1095 if (cmd->reject_reason)
1096 return 0;
1097
1098 return 1;
1099 }
1100 /*
1101 * Call directly into transport_generic_new_cmd() to perform
1102 * the backend memory allocation.
1103 */
1104 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1105 if (cmd->sense_reason)
1106 return 1;
1107
1108 return 0;
1109 }
1110 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1111
1112 static int
1113 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1114 bool dump_payload)
1115 {
1116 struct iscsi_conn *conn = cmd->conn;
1117 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1118 /*
1119 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1120 */
1121 if (dump_payload)
1122 goto after_immediate_data;
1123
1124 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1125 cmd->first_burst_len);
1126 after_immediate_data:
1127 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1128 /*
1129 * A PDU/CmdSN carrying Immediate Data passed
1130 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1131 * Immediate Bit is not set.
1132 */
1133 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1134 (unsigned char *)hdr, hdr->cmdsn);
1135 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1136 return -1;
1137
1138 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1139 int rc;
1140
1141 rc = iscsit_dump_data_payload(cmd->conn,
1142 cmd->first_burst_len, 1);
1143 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1144 return rc;
1145 } else if (cmd->unsolicited_data)
1146 iscsit_set_unsoliticed_dataout(cmd);
1147
1148 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1149 /*
1150 * Immediate Data failed DataCRC and ERL>=1,
1151 * silently drop this PDU and let the initiator
1152 * plug the CmdSN gap.
1153 *
1154 * FIXME: Send Unsolicited NOPIN with reserved
1155 * TTT here to help the initiator figure out
1156 * the missing CmdSN, although they should be
1157 * intelligent enough to determine the missing
1158 * CmdSN and issue a retry to plug the sequence.
1159 */
1160 cmd->i_state = ISTATE_REMOVE;
1161 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1162 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1163 return -1;
1164
1165 return 0;
1166 }
1167
1168 static int
1169 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1170 unsigned char *buf)
1171 {
1172 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1173 int rc, immed_data;
1174 bool dump_payload = false;
1175
1176 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1177 if (rc < 0)
1178 return 0;
1179 /*
1180 * Allocation iovecs needed for struct socket operations for
1181 * traditional iSCSI block I/O.
1182 */
1183 if (iscsit_allocate_iovecs(cmd) < 0) {
1184 return iscsit_add_reject_cmd(cmd,
1185 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1186 }
1187 immed_data = cmd->immediate_data;
1188
1189 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1190 if (rc < 0)
1191 return rc;
1192 else if (rc > 0)
1193 dump_payload = true;
1194
1195 if (!immed_data)
1196 return 0;
1197
1198 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1199 }
1200
1201 static u32 iscsit_do_crypto_hash_sg(
1202 struct hash_desc *hash,
1203 struct iscsi_cmd *cmd,
1204 u32 data_offset,
1205 u32 data_length,
1206 u32 padding,
1207 u8 *pad_bytes)
1208 {
1209 u32 data_crc;
1210 u32 i;
1211 struct scatterlist *sg;
1212 unsigned int page_off;
1213
1214 crypto_hash_init(hash);
1215
1216 sg = cmd->first_data_sg;
1217 page_off = cmd->first_data_sg_off;
1218
1219 i = 0;
1220 while (data_length) {
1221 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1222
1223 crypto_hash_update(hash, &sg[i], cur_len);
1224
1225 data_length -= cur_len;
1226 page_off = 0;
1227 i++;
1228 }
1229
1230 if (padding) {
1231 struct scatterlist pad_sg;
1232
1233 sg_init_one(&pad_sg, pad_bytes, padding);
1234 crypto_hash_update(hash, &pad_sg, padding);
1235 }
1236 crypto_hash_final(hash, (u8 *) &data_crc);
1237
1238 return data_crc;
1239 }
1240
1241 static void iscsit_do_crypto_hash_buf(
1242 struct hash_desc *hash,
1243 const void *buf,
1244 u32 payload_length,
1245 u32 padding,
1246 u8 *pad_bytes,
1247 u8 *data_crc)
1248 {
1249 struct scatterlist sg;
1250
1251 crypto_hash_init(hash);
1252
1253 sg_init_one(&sg, buf, payload_length);
1254 crypto_hash_update(hash, &sg, payload_length);
1255
1256 if (padding) {
1257 sg_init_one(&sg, pad_bytes, padding);
1258 crypto_hash_update(hash, &sg, padding);
1259 }
1260 crypto_hash_final(hash, data_crc);
1261 }
1262
1263 int
1264 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1265 struct iscsi_cmd **out_cmd)
1266 {
1267 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1268 struct iscsi_cmd *cmd = NULL;
1269 struct se_cmd *se_cmd;
1270 u32 payload_length = ntoh24(hdr->dlength);
1271 int rc;
1272
1273 if (!payload_length) {
1274 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1275 return 0;
1276 }
1277
1278 /* iSCSI write */
1279 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1280
1281 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1282 pr_err("DataSegmentLength: %u is greater than"
1283 " MaxXmitDataSegmentLength: %u\n", payload_length,
1284 conn->conn_ops->MaxXmitDataSegmentLength);
1285 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1286 buf);
1287 }
1288
1289 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1290 payload_length);
1291 if (!cmd)
1292 return 0;
1293
1294 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1295 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1296 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1297 payload_length, conn->cid);
1298
1299 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1300 pr_err("Command ITT: 0x%08x received DataOUT after"
1301 " last DataOUT received, dumping payload\n",
1302 cmd->init_task_tag);
1303 return iscsit_dump_data_payload(conn, payload_length, 1);
1304 }
1305
1306 if (cmd->data_direction != DMA_TO_DEVICE) {
1307 pr_err("Command ITT: 0x%08x received DataOUT for a"
1308 " NON-WRITE command.\n", cmd->init_task_tag);
1309 return iscsit_dump_data_payload(conn, payload_length, 1);
1310 }
1311 se_cmd = &cmd->se_cmd;
1312 iscsit_mod_dataout_timer(cmd);
1313
1314 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1315 pr_err("DataOut Offset: %u, Length %u greater than"
1316 " iSCSI Command EDTL %u, protocol error.\n",
1317 hdr->offset, payload_length, cmd->se_cmd.data_length);
1318 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1319 }
1320
1321 if (cmd->unsolicited_data) {
1322 int dump_unsolicited_data = 0;
1323
1324 if (conn->sess->sess_ops->InitialR2T) {
1325 pr_err("Received unexpected unsolicited data"
1326 " while InitialR2T=Yes, protocol error.\n");
1327 transport_send_check_condition_and_sense(&cmd->se_cmd,
1328 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1329 return -1;
1330 }
1331 /*
1332 * Special case for dealing with Unsolicited DataOUT
1333 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1334 * failures;
1335 */
1336
1337 /* Something's amiss if we're not in WRITE_PENDING state... */
1338 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1339 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1340 dump_unsolicited_data = 1;
1341
1342 if (dump_unsolicited_data) {
1343 /*
1344 * Check if a delayed TASK_ABORTED status needs to
1345 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1346 * received with the unsolicitied data out.
1347 */
1348 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1349 iscsit_stop_dataout_timer(cmd);
1350
1351 transport_check_aborted_status(se_cmd,
1352 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1353 return iscsit_dump_data_payload(conn, payload_length, 1);
1354 }
1355 } else {
1356 /*
1357 * For the normal solicited data path:
1358 *
1359 * Check for a delayed TASK_ABORTED status and dump any
1360 * incoming data out payload if one exists. Also, when the
1361 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1362 * data out sequence, we decrement outstanding_r2ts. Once
1363 * outstanding_r2ts reaches zero, go ahead and send the delayed
1364 * TASK_ABORTED status.
1365 */
1366 if (se_cmd->transport_state & CMD_T_ABORTED) {
1367 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1368 if (--cmd->outstanding_r2ts < 1) {
1369 iscsit_stop_dataout_timer(cmd);
1370 transport_check_aborted_status(
1371 se_cmd, 1);
1372 }
1373
1374 return iscsit_dump_data_payload(conn, payload_length, 1);
1375 }
1376 }
1377 /*
1378 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1379 * within-command recovery checks before receiving the payload.
1380 */
1381 rc = iscsit_check_pre_dataout(cmd, buf);
1382 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1383 return 0;
1384 else if (rc == DATAOUT_CANNOT_RECOVER)
1385 return -1;
1386
1387 *out_cmd = cmd;
1388 return 0;
1389 }
1390 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1391
1392 static int
1393 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1394 struct iscsi_data *hdr)
1395 {
1396 struct kvec *iov;
1397 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1398 u32 payload_length = ntoh24(hdr->dlength);
1399 int iov_ret, data_crc_failed = 0;
1400
1401 rx_size += payload_length;
1402 iov = &cmd->iov_data[0];
1403
1404 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1405 payload_length);
1406 if (iov_ret < 0)
1407 return -1;
1408
1409 iov_count += iov_ret;
1410
1411 padding = ((-payload_length) & 3);
1412 if (padding != 0) {
1413 iov[iov_count].iov_base = cmd->pad_bytes;
1414 iov[iov_count++].iov_len = padding;
1415 rx_size += padding;
1416 pr_debug("Receiving %u padding bytes.\n", padding);
1417 }
1418
1419 if (conn->conn_ops->DataDigest) {
1420 iov[iov_count].iov_base = &checksum;
1421 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1422 rx_size += ISCSI_CRC_LEN;
1423 }
1424
1425 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1426
1427 iscsit_unmap_iovec(cmd);
1428
1429 if (rx_got != rx_size)
1430 return -1;
1431
1432 if (conn->conn_ops->DataDigest) {
1433 u32 data_crc;
1434
1435 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1436 be32_to_cpu(hdr->offset),
1437 payload_length, padding,
1438 cmd->pad_bytes);
1439
1440 if (checksum != data_crc) {
1441 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1442 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1443 " does not match computed 0x%08x\n",
1444 hdr->itt, hdr->offset, payload_length,
1445 hdr->datasn, checksum, data_crc);
1446 data_crc_failed = 1;
1447 } else {
1448 pr_debug("Got CRC32C DataDigest 0x%08x for"
1449 " %u bytes of Data Out\n", checksum,
1450 payload_length);
1451 }
1452 }
1453
1454 return data_crc_failed;
1455 }
1456
1457 int
1458 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1459 bool data_crc_failed)
1460 {
1461 struct iscsi_conn *conn = cmd->conn;
1462 int rc, ooo_cmdsn;
1463 /*
1464 * Increment post receive data and CRC values or perform
1465 * within-command recovery.
1466 */
1467 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1468 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1469 return 0;
1470 else if (rc == DATAOUT_SEND_R2T) {
1471 iscsit_set_dataout_sequence_values(cmd);
1472 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1473 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1474 /*
1475 * Handle extra special case for out of order
1476 * Unsolicited Data Out.
1477 */
1478 spin_lock_bh(&cmd->istate_lock);
1479 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1480 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1481 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1482 spin_unlock_bh(&cmd->istate_lock);
1483
1484 iscsit_stop_dataout_timer(cmd);
1485 if (ooo_cmdsn)
1486 return 0;
1487 target_execute_cmd(&cmd->se_cmd);
1488 return 0;
1489 } else /* DATAOUT_CANNOT_RECOVER */
1490 return -1;
1491
1492 return 0;
1493 }
1494 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1495
1496 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1497 {
1498 struct iscsi_cmd *cmd = NULL;
1499 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1500 int rc;
1501 bool data_crc_failed = false;
1502
1503 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1504 if (rc < 0)
1505 return 0;
1506 else if (!cmd)
1507 return 0;
1508
1509 rc = iscsit_get_dataout(conn, cmd, hdr);
1510 if (rc < 0)
1511 return rc;
1512 else if (rc > 0)
1513 data_crc_failed = true;
1514
1515 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1516 }
1517
1518 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1519 struct iscsi_nopout *hdr)
1520 {
1521 u32 payload_length = ntoh24(hdr->dlength);
1522
1523 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1524 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1525 if (!cmd)
1526 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1527 (unsigned char *)hdr);
1528
1529 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1530 (unsigned char *)hdr);
1531 }
1532
1533 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1534 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1535 " not set, protocol error.\n");
1536 if (!cmd)
1537 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1538 (unsigned char *)hdr);
1539
1540 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1541 (unsigned char *)hdr);
1542 }
1543
1544 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1545 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1546 " greater than MaxXmitDataSegmentLength: %u, protocol"
1547 " error.\n", payload_length,
1548 conn->conn_ops->MaxXmitDataSegmentLength);
1549 if (!cmd)
1550 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1551 (unsigned char *)hdr);
1552
1553 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1554 (unsigned char *)hdr);
1555 }
1556
1557 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1558 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1559 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1560 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1561 payload_length);
1562 /*
1563 * This is not a response to a Unsolicited NopIN, which means
1564 * it can either be a NOPOUT ping request (with a valid ITT),
1565 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1566 * Either way, make sure we allocate an struct iscsi_cmd, as both
1567 * can contain ping data.
1568 */
1569 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1570 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1571 cmd->i_state = ISTATE_SEND_NOPIN;
1572 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1573 1 : 0);
1574 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1575 cmd->targ_xfer_tag = 0xFFFFFFFF;
1576 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1577 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1578 cmd->data_direction = DMA_NONE;
1579 }
1580
1581 return 0;
1582 }
1583 EXPORT_SYMBOL(iscsit_setup_nop_out);
1584
1585 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1586 struct iscsi_nopout *hdr)
1587 {
1588 struct iscsi_cmd *cmd_p = NULL;
1589 int cmdsn_ret = 0;
1590 /*
1591 * Initiator is expecting a NopIN ping reply..
1592 */
1593 if (hdr->itt != RESERVED_ITT) {
1594 if (!cmd)
1595 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1596 (unsigned char *)hdr);
1597
1598 spin_lock_bh(&conn->cmd_lock);
1599 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1600 spin_unlock_bh(&conn->cmd_lock);
1601
1602 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1603
1604 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1605 iscsit_add_cmd_to_response_queue(cmd, conn,
1606 cmd->i_state);
1607 return 0;
1608 }
1609
1610 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1611 (unsigned char *)hdr, hdr->cmdsn);
1612 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1613 return 0;
1614 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1615 return -1;
1616
1617 return 0;
1618 }
1619 /*
1620 * This was a response to a unsolicited NOPIN ping.
1621 */
1622 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1623 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1624 if (!cmd_p)
1625 return -EINVAL;
1626
1627 iscsit_stop_nopin_response_timer(conn);
1628
1629 cmd_p->i_state = ISTATE_REMOVE;
1630 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1631
1632 iscsit_start_nopin_timer(conn);
1633 return 0;
1634 }
1635 /*
1636 * Otherwise, initiator is not expecting a NOPIN is response.
1637 * Just ignore for now.
1638 */
1639 return 0;
1640 }
1641 EXPORT_SYMBOL(iscsit_process_nop_out);
1642
1643 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1644 unsigned char *buf)
1645 {
1646 unsigned char *ping_data = NULL;
1647 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1648 struct kvec *iov = NULL;
1649 u32 payload_length = ntoh24(hdr->dlength);
1650 int ret;
1651
1652 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1653 if (ret < 0)
1654 return 0;
1655 /*
1656 * Handle NOP-OUT payload for traditional iSCSI sockets
1657 */
1658 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1659 u32 checksum, data_crc, padding = 0;
1660 int niov = 0, rx_got, rx_size = payload_length;
1661
1662 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1663 if (!ping_data) {
1664 pr_err("Unable to allocate memory for"
1665 " NOPOUT ping data.\n");
1666 ret = -1;
1667 goto out;
1668 }
1669
1670 iov = &cmd->iov_misc[0];
1671 iov[niov].iov_base = ping_data;
1672 iov[niov++].iov_len = payload_length;
1673
1674 padding = ((-payload_length) & 3);
1675 if (padding != 0) {
1676 pr_debug("Receiving %u additional bytes"
1677 " for padding.\n", padding);
1678 iov[niov].iov_base = &cmd->pad_bytes;
1679 iov[niov++].iov_len = padding;
1680 rx_size += padding;
1681 }
1682 if (conn->conn_ops->DataDigest) {
1683 iov[niov].iov_base = &checksum;
1684 iov[niov++].iov_len = ISCSI_CRC_LEN;
1685 rx_size += ISCSI_CRC_LEN;
1686 }
1687
1688 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1689 if (rx_got != rx_size) {
1690 ret = -1;
1691 goto out;
1692 }
1693
1694 if (conn->conn_ops->DataDigest) {
1695 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1696 ping_data, payload_length,
1697 padding, cmd->pad_bytes,
1698 (u8 *)&data_crc);
1699
1700 if (checksum != data_crc) {
1701 pr_err("Ping data CRC32C DataDigest"
1702 " 0x%08x does not match computed 0x%08x\n",
1703 checksum, data_crc);
1704 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1705 pr_err("Unable to recover from"
1706 " NOPOUT Ping DataCRC failure while in"
1707 " ERL=0.\n");
1708 ret = -1;
1709 goto out;
1710 } else {
1711 /*
1712 * Silently drop this PDU and let the
1713 * initiator plug the CmdSN gap.
1714 */
1715 pr_debug("Dropping NOPOUT"
1716 " Command CmdSN: 0x%08x due to"
1717 " DataCRC error.\n", hdr->cmdsn);
1718 ret = 0;
1719 goto out;
1720 }
1721 } else {
1722 pr_debug("Got CRC32C DataDigest"
1723 " 0x%08x for %u bytes of ping data.\n",
1724 checksum, payload_length);
1725 }
1726 }
1727
1728 ping_data[payload_length] = '\0';
1729 /*
1730 * Attach ping data to struct iscsi_cmd->buf_ptr.
1731 */
1732 cmd->buf_ptr = ping_data;
1733 cmd->buf_ptr_size = payload_length;
1734
1735 pr_debug("Got %u bytes of NOPOUT ping"
1736 " data.\n", payload_length);
1737 pr_debug("Ping Data: \"%s\"\n", ping_data);
1738 }
1739
1740 return iscsit_process_nop_out(conn, cmd, hdr);
1741 out:
1742 if (cmd)
1743 iscsit_free_cmd(cmd, false);
1744
1745 kfree(ping_data);
1746 return ret;
1747 }
1748
1749 int
1750 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1751 unsigned char *buf)
1752 {
1753 struct se_tmr_req *se_tmr;
1754 struct iscsi_tmr_req *tmr_req;
1755 struct iscsi_tm *hdr;
1756 int out_of_order_cmdsn = 0, ret;
1757 bool sess_ref = false;
1758 u8 function;
1759
1760 hdr = (struct iscsi_tm *) buf;
1761 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1762 function = hdr->flags;
1763
1764 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1765 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1766 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1767 hdr->rtt, hdr->refcmdsn, conn->cid);
1768
1769 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1770 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1771 hdr->rtt != RESERVED_ITT)) {
1772 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1773 hdr->rtt = RESERVED_ITT;
1774 }
1775
1776 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1777 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1778 pr_err("Task Management Request TASK_REASSIGN not"
1779 " issued as immediate command, bad iSCSI Initiator"
1780 "implementation\n");
1781 return iscsit_add_reject_cmd(cmd,
1782 ISCSI_REASON_PROTOCOL_ERROR, buf);
1783 }
1784 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1785 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1786 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1787
1788 cmd->data_direction = DMA_NONE;
1789
1790 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1791 if (!cmd->tmr_req) {
1792 pr_err("Unable to allocate memory for"
1793 " Task Management command!\n");
1794 return iscsit_add_reject_cmd(cmd,
1795 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1796 buf);
1797 }
1798
1799 /*
1800 * TASK_REASSIGN for ERL=2 / connection stays inside of
1801 * LIO-Target $FABRIC_MOD
1802 */
1803 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1804
1805 u8 tcm_function;
1806 int ret;
1807
1808 transport_init_se_cmd(&cmd->se_cmd,
1809 &lio_target_fabric_configfs->tf_ops,
1810 conn->sess->se_sess, 0, DMA_NONE,
1811 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1812
1813 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1814 sess_ref = true;
1815
1816 switch (function) {
1817 case ISCSI_TM_FUNC_ABORT_TASK:
1818 tcm_function = TMR_ABORT_TASK;
1819 break;
1820 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1821 tcm_function = TMR_ABORT_TASK_SET;
1822 break;
1823 case ISCSI_TM_FUNC_CLEAR_ACA:
1824 tcm_function = TMR_CLEAR_ACA;
1825 break;
1826 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1827 tcm_function = TMR_CLEAR_TASK_SET;
1828 break;
1829 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1830 tcm_function = TMR_LUN_RESET;
1831 break;
1832 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1833 tcm_function = TMR_TARGET_WARM_RESET;
1834 break;
1835 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1836 tcm_function = TMR_TARGET_COLD_RESET;
1837 break;
1838 default:
1839 pr_err("Unknown iSCSI TMR Function:"
1840 " 0x%02x\n", function);
1841 return iscsit_add_reject_cmd(cmd,
1842 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1843 }
1844
1845 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1846 tcm_function, GFP_KERNEL);
1847 if (ret < 0)
1848 return iscsit_add_reject_cmd(cmd,
1849 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1850
1851 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1852 }
1853
1854 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1855 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1856 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1857 cmd->init_task_tag = hdr->itt;
1858 cmd->targ_xfer_tag = 0xFFFFFFFF;
1859 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1860 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1861 se_tmr = cmd->se_cmd.se_tmr_req;
1862 tmr_req = cmd->tmr_req;
1863 /*
1864 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1865 */
1866 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1867 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1868 scsilun_to_int(&hdr->lun));
1869 if (ret < 0) {
1870 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1871 goto attach;
1872 }
1873 }
1874
1875 switch (function) {
1876 case ISCSI_TM_FUNC_ABORT_TASK:
1877 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1878 if (se_tmr->response)
1879 goto attach;
1880 break;
1881 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1882 case ISCSI_TM_FUNC_CLEAR_ACA:
1883 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1884 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1885 break;
1886 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1887 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1888 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1889 goto attach;
1890 }
1891 break;
1892 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1893 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1894 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1895 goto attach;
1896 }
1897 break;
1898 case ISCSI_TM_FUNC_TASK_REASSIGN:
1899 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1900 /*
1901 * Perform sanity checks on the ExpDataSN only if the
1902 * TASK_REASSIGN was successful.
1903 */
1904 if (se_tmr->response)
1905 break;
1906
1907 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1908 return iscsit_add_reject_cmd(cmd,
1909 ISCSI_REASON_BOOKMARK_INVALID, buf);
1910 break;
1911 default:
1912 pr_err("Unknown TMR function: 0x%02x, protocol"
1913 " error.\n", function);
1914 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1915 goto attach;
1916 }
1917
1918 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1919 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1920 se_tmr->call_transport = 1;
1921 attach:
1922 spin_lock_bh(&conn->cmd_lock);
1923 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1924 spin_unlock_bh(&conn->cmd_lock);
1925
1926 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1927 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1928 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1929 out_of_order_cmdsn = 1;
1930 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1931 return 0;
1932 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1933 return -1;
1934 }
1935 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1936
1937 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1938 return 0;
1939 /*
1940 * Found the referenced task, send to transport for processing.
1941 */
1942 if (se_tmr->call_transport)
1943 return transport_generic_handle_tmr(&cmd->se_cmd);
1944
1945 /*
1946 * Could not find the referenced LUN, task, or Task Management
1947 * command not authorized or supported. Change state and
1948 * let the tx_thread send the response.
1949 *
1950 * For connection recovery, this is also the default action for
1951 * TMR TASK_REASSIGN.
1952 */
1953 if (sess_ref) {
1954 pr_debug("Handle TMR, using sess_ref=true check\n");
1955 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1956 }
1957
1958 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1959 return 0;
1960 }
1961 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1962
1963 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1964 int
1965 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1966 struct iscsi_text *hdr)
1967 {
1968 u32 payload_length = ntoh24(hdr->dlength);
1969
1970 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1971 pr_err("Unable to accept text parameter length: %u"
1972 "greater than MaxXmitDataSegmentLength %u.\n",
1973 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1974 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1975 (unsigned char *)hdr);
1976 }
1977
1978 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1979 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1980 pr_err("Multi sequence text commands currently not supported\n");
1981 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1982 (unsigned char *)hdr);
1983 }
1984
1985 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1986 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1987 hdr->exp_statsn, payload_length);
1988
1989 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1990 cmd->i_state = ISTATE_SEND_TEXTRSP;
1991 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1992 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1993 cmd->targ_xfer_tag = 0xFFFFFFFF;
1994 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1995 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1996 cmd->data_direction = DMA_NONE;
1997 cmd->text_in_ptr = NULL;
1998
1999 return 0;
2000 }
2001 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2002
2003 int
2004 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2005 struct iscsi_text *hdr)
2006 {
2007 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2008 int cmdsn_ret;
2009
2010 if (!text_in) {
2011 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2012 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2013 pr_err("Unable to locate text_in buffer for sendtargets"
2014 " discovery\n");
2015 goto reject;
2016 }
2017 goto empty_sendtargets;
2018 }
2019 if (strncmp("SendTargets", text_in, 11) != 0) {
2020 pr_err("Received Text Data that is not"
2021 " SendTargets, cannot continue.\n");
2022 goto reject;
2023 }
2024 text_ptr = strchr(text_in, '=');
2025 if (!text_ptr) {
2026 pr_err("No \"=\" separator found in Text Data,"
2027 " cannot continue.\n");
2028 goto reject;
2029 }
2030 if (!strncmp("=All", text_ptr, 4)) {
2031 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2032 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2033 !strncmp("=eui.", text_ptr, 5)) {
2034 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2035 } else {
2036 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2037 goto reject;
2038 }
2039
2040 spin_lock_bh(&conn->cmd_lock);
2041 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2042 spin_unlock_bh(&conn->cmd_lock);
2043
2044 empty_sendtargets:
2045 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2046
2047 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2048 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2049 (unsigned char *)hdr, hdr->cmdsn);
2050 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2051 return -1;
2052
2053 return 0;
2054 }
2055
2056 return iscsit_execute_cmd(cmd, 0);
2057
2058 reject:
2059 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2060 (unsigned char *)hdr);
2061 }
2062 EXPORT_SYMBOL(iscsit_process_text_cmd);
2063
2064 static int
2065 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2066 unsigned char *buf)
2067 {
2068 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2069 char *text_in = NULL;
2070 u32 payload_length = ntoh24(hdr->dlength);
2071 int rx_size, rc;
2072
2073 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2074 if (rc < 0)
2075 return 0;
2076
2077 rx_size = payload_length;
2078 if (payload_length) {
2079 u32 checksum = 0, data_crc = 0;
2080 u32 padding = 0, pad_bytes = 0;
2081 int niov = 0, rx_got;
2082 struct kvec iov[3];
2083
2084 text_in = kzalloc(payload_length, GFP_KERNEL);
2085 if (!text_in) {
2086 pr_err("Unable to allocate memory for"
2087 " incoming text parameters\n");
2088 goto reject;
2089 }
2090 cmd->text_in_ptr = text_in;
2091
2092 memset(iov, 0, 3 * sizeof(struct kvec));
2093 iov[niov].iov_base = text_in;
2094 iov[niov++].iov_len = payload_length;
2095
2096 padding = ((-payload_length) & 3);
2097 if (padding != 0) {
2098 iov[niov].iov_base = &pad_bytes;
2099 iov[niov++].iov_len = padding;
2100 rx_size += padding;
2101 pr_debug("Receiving %u additional bytes"
2102 " for padding.\n", padding);
2103 }
2104 if (conn->conn_ops->DataDigest) {
2105 iov[niov].iov_base = &checksum;
2106 iov[niov++].iov_len = ISCSI_CRC_LEN;
2107 rx_size += ISCSI_CRC_LEN;
2108 }
2109
2110 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2111 if (rx_got != rx_size)
2112 goto reject;
2113
2114 if (conn->conn_ops->DataDigest) {
2115 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2116 text_in, payload_length,
2117 padding, (u8 *)&pad_bytes,
2118 (u8 *)&data_crc);
2119
2120 if (checksum != data_crc) {
2121 pr_err("Text data CRC32C DataDigest"
2122 " 0x%08x does not match computed"
2123 " 0x%08x\n", checksum, data_crc);
2124 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2125 pr_err("Unable to recover from"
2126 " Text Data digest failure while in"
2127 " ERL=0.\n");
2128 goto reject;
2129 } else {
2130 /*
2131 * Silently drop this PDU and let the
2132 * initiator plug the CmdSN gap.
2133 */
2134 pr_debug("Dropping Text"
2135 " Command CmdSN: 0x%08x due to"
2136 " DataCRC error.\n", hdr->cmdsn);
2137 kfree(text_in);
2138 return 0;
2139 }
2140 } else {
2141 pr_debug("Got CRC32C DataDigest"
2142 " 0x%08x for %u bytes of text data.\n",
2143 checksum, payload_length);
2144 }
2145 }
2146 text_in[payload_length - 1] = '\0';
2147 pr_debug("Successfully read %d bytes of text"
2148 " data.\n", payload_length);
2149 }
2150
2151 return iscsit_process_text_cmd(conn, cmd, hdr);
2152
2153 reject:
2154 kfree(cmd->text_in_ptr);
2155 cmd->text_in_ptr = NULL;
2156 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2157 }
2158 EXPORT_SYMBOL(iscsit_handle_text_cmd);
2159
2160 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2161 {
2162 struct iscsi_conn *conn_p;
2163 struct iscsi_session *sess = conn->sess;
2164
2165 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2166 " for SID: %u.\n", conn->cid, conn->sess->sid);
2167
2168 atomic_set(&sess->session_logout, 1);
2169 atomic_set(&conn->conn_logout_remove, 1);
2170 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2171
2172 iscsit_inc_conn_usage_count(conn);
2173 iscsit_inc_session_usage_count(sess);
2174
2175 spin_lock_bh(&sess->conn_lock);
2176 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2177 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2178 continue;
2179
2180 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2181 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2182 }
2183 spin_unlock_bh(&sess->conn_lock);
2184
2185 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2186
2187 return 0;
2188 }
2189
2190 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2191 {
2192 struct iscsi_conn *l_conn;
2193 struct iscsi_session *sess = conn->sess;
2194
2195 pr_debug("Received logout request CLOSECONNECTION for CID:"
2196 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2197
2198 /*
2199 * A Logout Request with a CLOSECONNECTION reason code for a CID
2200 * can arrive on a connection with a differing CID.
2201 */
2202 if (conn->cid == cmd->logout_cid) {
2203 spin_lock_bh(&conn->state_lock);
2204 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2205 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2206
2207 atomic_set(&conn->conn_logout_remove, 1);
2208 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2209 iscsit_inc_conn_usage_count(conn);
2210
2211 spin_unlock_bh(&conn->state_lock);
2212 } else {
2213 /*
2214 * Handle all different cid CLOSECONNECTION requests in
2215 * iscsit_logout_post_handler_diffcid() as to give enough
2216 * time for any non immediate command's CmdSN to be
2217 * acknowledged on the connection in question.
2218 *
2219 * Here we simply make sure the CID is still around.
2220 */
2221 l_conn = iscsit_get_conn_from_cid(sess,
2222 cmd->logout_cid);
2223 if (!l_conn) {
2224 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2225 iscsit_add_cmd_to_response_queue(cmd, conn,
2226 cmd->i_state);
2227 return 0;
2228 }
2229
2230 iscsit_dec_conn_usage_count(l_conn);
2231 }
2232
2233 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2234
2235 return 0;
2236 }
2237
2238 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2239 {
2240 struct iscsi_session *sess = conn->sess;
2241
2242 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2243 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2244
2245 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2246 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2247 " while ERL!=2.\n");
2248 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2249 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2250 return 0;
2251 }
2252
2253 if (conn->cid == cmd->logout_cid) {
2254 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2255 " with CID: %hu on CID: %hu, implementation error.\n",
2256 cmd->logout_cid, conn->cid);
2257 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2258 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2259 return 0;
2260 }
2261
2262 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2263
2264 return 0;
2265 }
2266
2267 int
2268 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2269 unsigned char *buf)
2270 {
2271 int cmdsn_ret, logout_remove = 0;
2272 u8 reason_code = 0;
2273 struct iscsi_logout *hdr;
2274 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2275
2276 hdr = (struct iscsi_logout *) buf;
2277 reason_code = (hdr->flags & 0x7f);
2278
2279 if (tiqn) {
2280 spin_lock(&tiqn->logout_stats.lock);
2281 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2282 tiqn->logout_stats.normal_logouts++;
2283 else
2284 tiqn->logout_stats.abnormal_logouts++;
2285 spin_unlock(&tiqn->logout_stats.lock);
2286 }
2287
2288 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2289 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2290 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2291 hdr->cid, conn->cid);
2292
2293 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2294 pr_err("Received logout request on connection that"
2295 " is not in logged in state, ignoring request.\n");
2296 iscsit_free_cmd(cmd, false);
2297 return 0;
2298 }
2299
2300 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2301 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2302 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2303 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2304 cmd->targ_xfer_tag = 0xFFFFFFFF;
2305 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2306 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2307 cmd->logout_cid = be16_to_cpu(hdr->cid);
2308 cmd->logout_reason = reason_code;
2309 cmd->data_direction = DMA_NONE;
2310
2311 /*
2312 * We need to sleep in these cases (by returning 1) until the Logout
2313 * Response gets sent in the tx thread.
2314 */
2315 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2316 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2317 be16_to_cpu(hdr->cid) == conn->cid))
2318 logout_remove = 1;
2319
2320 spin_lock_bh(&conn->cmd_lock);
2321 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2322 spin_unlock_bh(&conn->cmd_lock);
2323
2324 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2325 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2326
2327 /*
2328 * Immediate commands are executed, well, immediately.
2329 * Non-Immediate Logout Commands are executed in CmdSN order.
2330 */
2331 if (cmd->immediate_cmd) {
2332 int ret = iscsit_execute_cmd(cmd, 0);
2333
2334 if (ret < 0)
2335 return ret;
2336 } else {
2337 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2338 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2339 logout_remove = 0;
2340 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2341 return -1;
2342 }
2343
2344 return logout_remove;
2345 }
2346 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2347
2348 static int iscsit_handle_snack(
2349 struct iscsi_conn *conn,
2350 unsigned char *buf)
2351 {
2352 struct iscsi_snack *hdr;
2353
2354 hdr = (struct iscsi_snack *) buf;
2355 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2356
2357 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2358 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2359 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2360 hdr->begrun, hdr->runlength, conn->cid);
2361
2362 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2363 pr_err("Initiator sent SNACK request while in"
2364 " ErrorRecoveryLevel=0.\n");
2365 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2366 buf);
2367 }
2368 /*
2369 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2370 * call from inside iscsi_send_recovery_datain_or_r2t().
2371 */
2372 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2373 case 0:
2374 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2375 hdr->itt,
2376 be32_to_cpu(hdr->ttt),
2377 be32_to_cpu(hdr->begrun),
2378 be32_to_cpu(hdr->runlength));
2379 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2380 return iscsit_handle_status_snack(conn, hdr->itt,
2381 be32_to_cpu(hdr->ttt),
2382 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2383 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2384 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2385 be32_to_cpu(hdr->begrun),
2386 be32_to_cpu(hdr->runlength));
2387 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2388 /* FIXME: Support R-Data SNACK */
2389 pr_err("R-Data SNACK Not Supported.\n");
2390 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2391 buf);
2392 default:
2393 pr_err("Unknown SNACK type 0x%02x, protocol"
2394 " error.\n", hdr->flags & 0x0f);
2395 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2396 buf);
2397 }
2398
2399 return 0;
2400 }
2401
2402 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2403 {
2404 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2405 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2406 wait_for_completion_interruptible_timeout(
2407 &conn->rx_half_close_comp,
2408 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2409 }
2410 }
2411
2412 static int iscsit_handle_immediate_data(
2413 struct iscsi_cmd *cmd,
2414 struct iscsi_scsi_req *hdr,
2415 u32 length)
2416 {
2417 int iov_ret, rx_got = 0, rx_size = 0;
2418 u32 checksum, iov_count = 0, padding = 0;
2419 struct iscsi_conn *conn = cmd->conn;
2420 struct kvec *iov;
2421
2422 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2423 if (iov_ret < 0)
2424 return IMMEDIATE_DATA_CANNOT_RECOVER;
2425
2426 rx_size = length;
2427 iov_count = iov_ret;
2428 iov = &cmd->iov_data[0];
2429
2430 padding = ((-length) & 3);
2431 if (padding != 0) {
2432 iov[iov_count].iov_base = cmd->pad_bytes;
2433 iov[iov_count++].iov_len = padding;
2434 rx_size += padding;
2435 }
2436
2437 if (conn->conn_ops->DataDigest) {
2438 iov[iov_count].iov_base = &checksum;
2439 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2440 rx_size += ISCSI_CRC_LEN;
2441 }
2442
2443 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2444
2445 iscsit_unmap_iovec(cmd);
2446
2447 if (rx_got != rx_size) {
2448 iscsit_rx_thread_wait_for_tcp(conn);
2449 return IMMEDIATE_DATA_CANNOT_RECOVER;
2450 }
2451
2452 if (conn->conn_ops->DataDigest) {
2453 u32 data_crc;
2454
2455 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2456 cmd->write_data_done, length, padding,
2457 cmd->pad_bytes);
2458
2459 if (checksum != data_crc) {
2460 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2461 " does not match computed 0x%08x\n", checksum,
2462 data_crc);
2463
2464 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2465 pr_err("Unable to recover from"
2466 " Immediate Data digest failure while"
2467 " in ERL=0.\n");
2468 iscsit_reject_cmd(cmd,
2469 ISCSI_REASON_DATA_DIGEST_ERROR,
2470 (unsigned char *)hdr);
2471 return IMMEDIATE_DATA_CANNOT_RECOVER;
2472 } else {
2473 iscsit_reject_cmd(cmd,
2474 ISCSI_REASON_DATA_DIGEST_ERROR,
2475 (unsigned char *)hdr);
2476 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2477 }
2478 } else {
2479 pr_debug("Got CRC32C DataDigest 0x%08x for"
2480 " %u bytes of Immediate Data\n", checksum,
2481 length);
2482 }
2483 }
2484
2485 cmd->write_data_done += length;
2486
2487 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2488 spin_lock_bh(&cmd->istate_lock);
2489 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2490 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2491 spin_unlock_bh(&cmd->istate_lock);
2492 }
2493
2494 return IMMEDIATE_DATA_NORMAL_OPERATION;
2495 }
2496
2497 /*
2498 * Called with sess->conn_lock held.
2499 */
2500 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2501 with active network interface */
2502 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2503 {
2504 struct iscsi_cmd *cmd;
2505 struct iscsi_conn *conn_p;
2506 bool found = false;
2507
2508 /*
2509 * Only send a Asynchronous Message on connections whos network
2510 * interface is still functional.
2511 */
2512 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2513 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2514 iscsit_inc_conn_usage_count(conn_p);
2515 found = true;
2516 break;
2517 }
2518 }
2519
2520 if (!found)
2521 return;
2522
2523 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2524 if (!cmd) {
2525 iscsit_dec_conn_usage_count(conn_p);
2526 return;
2527 }
2528
2529 cmd->logout_cid = conn->cid;
2530 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2531 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2532
2533 spin_lock_bh(&conn_p->cmd_lock);
2534 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2535 spin_unlock_bh(&conn_p->cmd_lock);
2536
2537 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2538 iscsit_dec_conn_usage_count(conn_p);
2539 }
2540
2541 static int iscsit_send_conn_drop_async_message(
2542 struct iscsi_cmd *cmd,
2543 struct iscsi_conn *conn)
2544 {
2545 struct iscsi_async *hdr;
2546
2547 cmd->tx_size = ISCSI_HDR_LEN;
2548 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2549
2550 hdr = (struct iscsi_async *) cmd->pdu;
2551 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2552 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2553 cmd->init_task_tag = RESERVED_ITT;
2554 cmd->targ_xfer_tag = 0xFFFFFFFF;
2555 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2556 cmd->stat_sn = conn->stat_sn++;
2557 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2558 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2559 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2560 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2561 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2562 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2563 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2564
2565 if (conn->conn_ops->HeaderDigest) {
2566 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2567
2568 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2569 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2570
2571 cmd->tx_size += ISCSI_CRC_LEN;
2572 pr_debug("Attaching CRC32C HeaderDigest to"
2573 " Async Message 0x%08x\n", *header_digest);
2574 }
2575
2576 cmd->iov_misc[0].iov_base = cmd->pdu;
2577 cmd->iov_misc[0].iov_len = cmd->tx_size;
2578 cmd->iov_misc_count = 1;
2579
2580 pr_debug("Sending Connection Dropped Async Message StatSN:"
2581 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2582 cmd->logout_cid, conn->cid);
2583 return 0;
2584 }
2585
2586 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2587 {
2588 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2589 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2590 wait_for_completion_interruptible_timeout(
2591 &conn->tx_half_close_comp,
2592 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2593 }
2594 }
2595
2596 static void
2597 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2598 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2599 bool set_statsn)
2600 {
2601 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2602 hdr->flags = datain->flags;
2603 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2604 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2605 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2606 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2607 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2608 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2609 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2610 }
2611 }
2612 hton24(hdr->dlength, datain->length);
2613 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2614 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2615 (struct scsi_lun *)&hdr->lun);
2616 else
2617 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2618
2619 hdr->itt = cmd->init_task_tag;
2620
2621 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2622 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2623 else
2624 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2625 if (set_statsn)
2626 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2627 else
2628 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2629
2630 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2631 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2632 hdr->datasn = cpu_to_be32(datain->data_sn);
2633 hdr->offset = cpu_to_be32(datain->offset);
2634
2635 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2636 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2637 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2638 ntohl(hdr->offset), datain->length, conn->cid);
2639 }
2640
2641 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2642 {
2643 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2644 struct iscsi_datain datain;
2645 struct iscsi_datain_req *dr;
2646 struct kvec *iov;
2647 u32 iov_count = 0, tx_size = 0;
2648 int eodr = 0, ret, iov_ret;
2649 bool set_statsn = false;
2650
2651 memset(&datain, 0, sizeof(struct iscsi_datain));
2652 dr = iscsit_get_datain_values(cmd, &datain);
2653 if (!dr) {
2654 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2655 cmd->init_task_tag);
2656 return -1;
2657 }
2658 /*
2659 * Be paranoid and double check the logic for now.
2660 */
2661 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2662 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2663 " datain.length: %u exceeds cmd->data_length: %u\n",
2664 cmd->init_task_tag, datain.offset, datain.length,
2665 cmd->se_cmd.data_length);
2666 return -1;
2667 }
2668
2669 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2670 /*
2671 * Special case for successfully execution w/ both DATAIN
2672 * and Sense Data.
2673 */
2674 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2675 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2676 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2677 else {
2678 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2679 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2680 iscsit_increment_maxcmdsn(cmd, conn->sess);
2681 cmd->stat_sn = conn->stat_sn++;
2682 set_statsn = true;
2683 } else if (dr->dr_complete ==
2684 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2685 set_statsn = true;
2686 }
2687
2688 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2689
2690 iov = &cmd->iov_data[0];
2691 iov[iov_count].iov_base = cmd->pdu;
2692 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2693 tx_size += ISCSI_HDR_LEN;
2694
2695 if (conn->conn_ops->HeaderDigest) {
2696 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2697
2698 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2699 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2700
2701 iov[0].iov_len += ISCSI_CRC_LEN;
2702 tx_size += ISCSI_CRC_LEN;
2703
2704 pr_debug("Attaching CRC32 HeaderDigest"
2705 " for DataIN PDU 0x%08x\n", *header_digest);
2706 }
2707
2708 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2709 datain.offset, datain.length);
2710 if (iov_ret < 0)
2711 return -1;
2712
2713 iov_count += iov_ret;
2714 tx_size += datain.length;
2715
2716 cmd->padding = ((-datain.length) & 3);
2717 if (cmd->padding) {
2718 iov[iov_count].iov_base = cmd->pad_bytes;
2719 iov[iov_count++].iov_len = cmd->padding;
2720 tx_size += cmd->padding;
2721
2722 pr_debug("Attaching %u padding bytes\n",
2723 cmd->padding);
2724 }
2725 if (conn->conn_ops->DataDigest) {
2726 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2727 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2728
2729 iov[iov_count].iov_base = &cmd->data_crc;
2730 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2731 tx_size += ISCSI_CRC_LEN;
2732
2733 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2734 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2735 }
2736
2737 cmd->iov_data_count = iov_count;
2738 cmd->tx_size = tx_size;
2739
2740 /* sendpage is preferred but can't insert markers */
2741 if (!conn->conn_ops->IFMarker)
2742 ret = iscsit_fe_sendpage_sg(cmd, conn);
2743 else
2744 ret = iscsit_send_tx_data(cmd, conn, 0);
2745
2746 iscsit_unmap_iovec(cmd);
2747
2748 if (ret < 0) {
2749 iscsit_tx_thread_wait_for_tcp(conn);
2750 return ret;
2751 }
2752
2753 if (dr->dr_complete) {
2754 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2755 2 : 1;
2756 iscsit_free_datain_req(cmd, dr);
2757 }
2758
2759 return eodr;
2760 }
2761
2762 int
2763 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2764 struct iscsi_logout_rsp *hdr)
2765 {
2766 struct iscsi_conn *logout_conn = NULL;
2767 struct iscsi_conn_recovery *cr = NULL;
2768 struct iscsi_session *sess = conn->sess;
2769 /*
2770 * The actual shutting down of Sessions and/or Connections
2771 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2772 * is done in scsi_logout_post_handler().
2773 */
2774 switch (cmd->logout_reason) {
2775 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2776 pr_debug("iSCSI session logout successful, setting"
2777 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2778 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2779 break;
2780 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2781 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2782 break;
2783 /*
2784 * For CLOSECONNECTION logout requests carrying
2785 * a matching logout CID -> local CID, the reference
2786 * for the local CID will have been incremented in
2787 * iscsi_logout_closeconnection().
2788 *
2789 * For CLOSECONNECTION logout requests carrying
2790 * a different CID than the connection it arrived
2791 * on, the connection responding to cmd->logout_cid
2792 * is stopped in iscsit_logout_post_handler_diffcid().
2793 */
2794
2795 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2796 " successful.\n", cmd->logout_cid, conn->cid);
2797 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2798 break;
2799 case ISCSI_LOGOUT_REASON_RECOVERY:
2800 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2801 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2802 break;
2803 /*
2804 * If the connection is still active from our point of view
2805 * force connection recovery to occur.
2806 */
2807 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2808 cmd->logout_cid);
2809 if (logout_conn) {
2810 iscsit_connection_reinstatement_rcfr(logout_conn);
2811 iscsit_dec_conn_usage_count(logout_conn);
2812 }
2813
2814 cr = iscsit_get_inactive_connection_recovery_entry(
2815 conn->sess, cmd->logout_cid);
2816 if (!cr) {
2817 pr_err("Unable to locate CID: %hu for"
2818 " REMOVECONNFORRECOVERY Logout Request.\n",
2819 cmd->logout_cid);
2820 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2821 break;
2822 }
2823
2824 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2825
2826 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2827 " for recovery for CID: %hu on CID: %hu successful.\n",
2828 cmd->logout_cid, conn->cid);
2829 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2830 break;
2831 default:
2832 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2833 cmd->logout_reason);
2834 return -1;
2835 }
2836
2837 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2838 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2839 hdr->response = cmd->logout_response;
2840 hdr->itt = cmd->init_task_tag;
2841 cmd->stat_sn = conn->stat_sn++;
2842 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2843
2844 iscsit_increment_maxcmdsn(cmd, conn->sess);
2845 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2846 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2847
2848 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2849 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2850 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2851 cmd->logout_cid, conn->cid);
2852
2853 return 0;
2854 }
2855 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2856
2857 static int
2858 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2859 {
2860 struct kvec *iov;
2861 int niov = 0, tx_size, rc;
2862
2863 rc = iscsit_build_logout_rsp(cmd, conn,
2864 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2865 if (rc < 0)
2866 return rc;
2867
2868 tx_size = ISCSI_HDR_LEN;
2869 iov = &cmd->iov_misc[0];
2870 iov[niov].iov_base = cmd->pdu;
2871 iov[niov++].iov_len = ISCSI_HDR_LEN;
2872
2873 if (conn->conn_ops->HeaderDigest) {
2874 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2875
2876 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2877 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2878
2879 iov[0].iov_len += ISCSI_CRC_LEN;
2880 tx_size += ISCSI_CRC_LEN;
2881 pr_debug("Attaching CRC32C HeaderDigest to"
2882 " Logout Response 0x%08x\n", *header_digest);
2883 }
2884 cmd->iov_misc_count = niov;
2885 cmd->tx_size = tx_size;
2886
2887 return 0;
2888 }
2889
2890 void
2891 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2892 struct iscsi_nopin *hdr, bool nopout_response)
2893 {
2894 hdr->opcode = ISCSI_OP_NOOP_IN;
2895 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2896 hton24(hdr->dlength, cmd->buf_ptr_size);
2897 if (nopout_response)
2898 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2899 hdr->itt = cmd->init_task_tag;
2900 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2901 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2902 conn->stat_sn;
2903 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2904
2905 if (nopout_response)
2906 iscsit_increment_maxcmdsn(cmd, conn->sess);
2907
2908 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2909 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2910
2911 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2912 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2913 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2914 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2915 }
2916 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2917
2918 /*
2919 * Unsolicited NOPIN, either requesting a response or not.
2920 */
2921 static int iscsit_send_unsolicited_nopin(
2922 struct iscsi_cmd *cmd,
2923 struct iscsi_conn *conn,
2924 int want_response)
2925 {
2926 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2927 int tx_size = ISCSI_HDR_LEN, ret;
2928
2929 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2930
2931 if (conn->conn_ops->HeaderDigest) {
2932 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2933
2934 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2935 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2936
2937 tx_size += ISCSI_CRC_LEN;
2938 pr_debug("Attaching CRC32C HeaderDigest to"
2939 " NopIN 0x%08x\n", *header_digest);
2940 }
2941
2942 cmd->iov_misc[0].iov_base = cmd->pdu;
2943 cmd->iov_misc[0].iov_len = tx_size;
2944 cmd->iov_misc_count = 1;
2945 cmd->tx_size = tx_size;
2946
2947 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2948 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2949
2950 ret = iscsit_send_tx_data(cmd, conn, 1);
2951 if (ret < 0) {
2952 iscsit_tx_thread_wait_for_tcp(conn);
2953 return ret;
2954 }
2955
2956 spin_lock_bh(&cmd->istate_lock);
2957 cmd->i_state = want_response ?
2958 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2959 spin_unlock_bh(&cmd->istate_lock);
2960
2961 return 0;
2962 }
2963
2964 static int
2965 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2966 {
2967 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2968 struct kvec *iov;
2969 u32 padding = 0;
2970 int niov = 0, tx_size;
2971
2972 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2973
2974 tx_size = ISCSI_HDR_LEN;
2975 iov = &cmd->iov_misc[0];
2976 iov[niov].iov_base = cmd->pdu;
2977 iov[niov++].iov_len = ISCSI_HDR_LEN;
2978
2979 if (conn->conn_ops->HeaderDigest) {
2980 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2981
2982 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2983 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2984
2985 iov[0].iov_len += ISCSI_CRC_LEN;
2986 tx_size += ISCSI_CRC_LEN;
2987 pr_debug("Attaching CRC32C HeaderDigest"
2988 " to NopIn 0x%08x\n", *header_digest);
2989 }
2990
2991 /*
2992 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2993 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2994 */
2995 if (cmd->buf_ptr_size) {
2996 iov[niov].iov_base = cmd->buf_ptr;
2997 iov[niov++].iov_len = cmd->buf_ptr_size;
2998 tx_size += cmd->buf_ptr_size;
2999
3000 pr_debug("Echoing back %u bytes of ping"
3001 " data.\n", cmd->buf_ptr_size);
3002
3003 padding = ((-cmd->buf_ptr_size) & 3);
3004 if (padding != 0) {
3005 iov[niov].iov_base = &cmd->pad_bytes;
3006 iov[niov++].iov_len = padding;
3007 tx_size += padding;
3008 pr_debug("Attaching %u additional"
3009 " padding bytes.\n", padding);
3010 }
3011 if (conn->conn_ops->DataDigest) {
3012 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3013 cmd->buf_ptr, cmd->buf_ptr_size,
3014 padding, (u8 *)&cmd->pad_bytes,
3015 (u8 *)&cmd->data_crc);
3016
3017 iov[niov].iov_base = &cmd->data_crc;
3018 iov[niov++].iov_len = ISCSI_CRC_LEN;
3019 tx_size += ISCSI_CRC_LEN;
3020 pr_debug("Attached DataDigest for %u"
3021 " bytes of ping data, CRC 0x%08x\n",
3022 cmd->buf_ptr_size, cmd->data_crc);
3023 }
3024 }
3025
3026 cmd->iov_misc_count = niov;
3027 cmd->tx_size = tx_size;
3028
3029 return 0;
3030 }
3031
3032 static int iscsit_send_r2t(
3033 struct iscsi_cmd *cmd,
3034 struct iscsi_conn *conn)
3035 {
3036 int tx_size = 0;
3037 struct iscsi_r2t *r2t;
3038 struct iscsi_r2t_rsp *hdr;
3039 int ret;
3040
3041 r2t = iscsit_get_r2t_from_list(cmd);
3042 if (!r2t)
3043 return -1;
3044
3045 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3046 memset(hdr, 0, ISCSI_HDR_LEN);
3047 hdr->opcode = ISCSI_OP_R2T;
3048 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3049 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3050 (struct scsi_lun *)&hdr->lun);
3051 hdr->itt = cmd->init_task_tag;
3052 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3053 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3054 hdr->statsn = cpu_to_be32(conn->stat_sn);
3055 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3056 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3057 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3058 hdr->data_offset = cpu_to_be32(r2t->offset);
3059 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3060
3061 cmd->iov_misc[0].iov_base = cmd->pdu;
3062 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3063 tx_size += ISCSI_HDR_LEN;
3064
3065 if (conn->conn_ops->HeaderDigest) {
3066 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3067
3068 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3069 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3070
3071 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3072 tx_size += ISCSI_CRC_LEN;
3073 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3074 " PDU 0x%08x\n", *header_digest);
3075 }
3076
3077 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3078 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3079 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3080 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3081 r2t->offset, r2t->xfer_len, conn->cid);
3082
3083 cmd->iov_misc_count = 1;
3084 cmd->tx_size = tx_size;
3085
3086 spin_lock_bh(&cmd->r2t_lock);
3087 r2t->sent_r2t = 1;
3088 spin_unlock_bh(&cmd->r2t_lock);
3089
3090 ret = iscsit_send_tx_data(cmd, conn, 1);
3091 if (ret < 0) {
3092 iscsit_tx_thread_wait_for_tcp(conn);
3093 return ret;
3094 }
3095
3096 spin_lock_bh(&cmd->dataout_timeout_lock);
3097 iscsit_start_dataout_timer(cmd, conn);
3098 spin_unlock_bh(&cmd->dataout_timeout_lock);
3099
3100 return 0;
3101 }
3102
3103 /*
3104 * @recovery: If called from iscsi_task_reassign_complete_write() for
3105 * connection recovery.
3106 */
3107 int iscsit_build_r2ts_for_cmd(
3108 struct iscsi_conn *conn,
3109 struct iscsi_cmd *cmd,
3110 bool recovery)
3111 {
3112 int first_r2t = 1;
3113 u32 offset = 0, xfer_len = 0;
3114
3115 spin_lock_bh(&cmd->r2t_lock);
3116 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3117 spin_unlock_bh(&cmd->r2t_lock);
3118 return 0;
3119 }
3120
3121 if (conn->sess->sess_ops->DataSequenceInOrder &&
3122 !recovery)
3123 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3124
3125 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3126 if (conn->sess->sess_ops->DataSequenceInOrder) {
3127 offset = cmd->r2t_offset;
3128
3129 if (first_r2t && recovery) {
3130 int new_data_end = offset +
3131 conn->sess->sess_ops->MaxBurstLength -
3132 cmd->next_burst_len;
3133
3134 if (new_data_end > cmd->se_cmd.data_length)
3135 xfer_len = cmd->se_cmd.data_length - offset;
3136 else
3137 xfer_len =
3138 conn->sess->sess_ops->MaxBurstLength -
3139 cmd->next_burst_len;
3140 } else {
3141 int new_data_end = offset +
3142 conn->sess->sess_ops->MaxBurstLength;
3143
3144 if (new_data_end > cmd->se_cmd.data_length)
3145 xfer_len = cmd->se_cmd.data_length - offset;
3146 else
3147 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3148 }
3149 cmd->r2t_offset += xfer_len;
3150
3151 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3152 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3153 } else {
3154 struct iscsi_seq *seq;
3155
3156 seq = iscsit_get_seq_holder_for_r2t(cmd);
3157 if (!seq) {
3158 spin_unlock_bh(&cmd->r2t_lock);
3159 return -1;
3160 }
3161
3162 offset = seq->offset;
3163 xfer_len = seq->xfer_len;
3164
3165 if (cmd->seq_send_order == cmd->seq_count)
3166 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3167 }
3168 cmd->outstanding_r2ts++;
3169 first_r2t = 0;
3170
3171 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3172 spin_unlock_bh(&cmd->r2t_lock);
3173 return -1;
3174 }
3175
3176 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3177 break;
3178 }
3179 spin_unlock_bh(&cmd->r2t_lock);
3180
3181 return 0;
3182 }
3183
3184 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3185 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3186 {
3187 if (inc_stat_sn)
3188 cmd->stat_sn = conn->stat_sn++;
3189
3190 atomic_long_inc(&conn->sess->rsp_pdus);
3191
3192 memset(hdr, 0, ISCSI_HDR_LEN);
3193 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3194 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3195 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3196 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3197 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3198 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3199 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3200 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3201 }
3202 hdr->response = cmd->iscsi_response;
3203 hdr->cmd_status = cmd->se_cmd.scsi_status;
3204 hdr->itt = cmd->init_task_tag;
3205 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3206
3207 iscsit_increment_maxcmdsn(cmd, conn->sess);
3208 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3209 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3210
3211 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3212 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3213 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3214 cmd->se_cmd.scsi_status, conn->cid);
3215 }
3216 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3217
3218 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3219 {
3220 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3221 struct kvec *iov;
3222 u32 padding = 0, tx_size = 0;
3223 int iov_count = 0;
3224 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3225
3226 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3227
3228 iov = &cmd->iov_misc[0];
3229 iov[iov_count].iov_base = cmd->pdu;
3230 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3231 tx_size += ISCSI_HDR_LEN;
3232
3233 /*
3234 * Attach SENSE DATA payload to iSCSI Response PDU
3235 */
3236 if (cmd->se_cmd.sense_buffer &&
3237 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3238 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3239 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3240 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3241
3242 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3243 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3244 iov[iov_count].iov_base = cmd->sense_buffer;
3245 iov[iov_count++].iov_len =
3246 (cmd->se_cmd.scsi_sense_length + padding);
3247 tx_size += cmd->se_cmd.scsi_sense_length;
3248
3249 if (padding) {
3250 memset(cmd->sense_buffer +
3251 cmd->se_cmd.scsi_sense_length, 0, padding);
3252 tx_size += padding;
3253 pr_debug("Adding %u bytes of padding to"
3254 " SENSE.\n", padding);
3255 }
3256
3257 if (conn->conn_ops->DataDigest) {
3258 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3259 cmd->sense_buffer,
3260 (cmd->se_cmd.scsi_sense_length + padding),
3261 0, NULL, (u8 *)&cmd->data_crc);
3262
3263 iov[iov_count].iov_base = &cmd->data_crc;
3264 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3265 tx_size += ISCSI_CRC_LEN;
3266
3267 pr_debug("Attaching CRC32 DataDigest for"
3268 " SENSE, %u bytes CRC 0x%08x\n",
3269 (cmd->se_cmd.scsi_sense_length + padding),
3270 cmd->data_crc);
3271 }
3272
3273 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3274 " Response PDU\n",
3275 cmd->se_cmd.scsi_sense_length);
3276 }
3277
3278 if (conn->conn_ops->HeaderDigest) {
3279 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3280
3281 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3282 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3283
3284 iov[0].iov_len += ISCSI_CRC_LEN;
3285 tx_size += ISCSI_CRC_LEN;
3286 pr_debug("Attaching CRC32 HeaderDigest for Response"
3287 " PDU 0x%08x\n", *header_digest);
3288 }
3289
3290 cmd->iov_misc_count = iov_count;
3291 cmd->tx_size = tx_size;
3292
3293 return 0;
3294 }
3295
3296 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3297 {
3298 switch (se_tmr->response) {
3299 case TMR_FUNCTION_COMPLETE:
3300 return ISCSI_TMF_RSP_COMPLETE;
3301 case TMR_TASK_DOES_NOT_EXIST:
3302 return ISCSI_TMF_RSP_NO_TASK;
3303 case TMR_LUN_DOES_NOT_EXIST:
3304 return ISCSI_TMF_RSP_NO_LUN;
3305 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3306 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3307 case TMR_FUNCTION_REJECTED:
3308 default:
3309 return ISCSI_TMF_RSP_REJECTED;
3310 }
3311 }
3312
3313 void
3314 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3315 struct iscsi_tm_rsp *hdr)
3316 {
3317 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3318
3319 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3320 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3321 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3322 hdr->itt = cmd->init_task_tag;
3323 cmd->stat_sn = conn->stat_sn++;
3324 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3325
3326 iscsit_increment_maxcmdsn(cmd, conn->sess);
3327 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3328 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3329
3330 pr_debug("Built Task Management Response ITT: 0x%08x,"
3331 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3332 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3333 }
3334 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3335
3336 static int
3337 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3338 {
3339 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3340 u32 tx_size = 0;
3341
3342 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3343
3344 cmd->iov_misc[0].iov_base = cmd->pdu;
3345 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3346 tx_size += ISCSI_HDR_LEN;
3347
3348 if (conn->conn_ops->HeaderDigest) {
3349 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3350
3351 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3352 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3353
3354 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3355 tx_size += ISCSI_CRC_LEN;
3356 pr_debug("Attaching CRC32 HeaderDigest for Task"
3357 " Mgmt Response PDU 0x%08x\n", *header_digest);
3358 }
3359
3360 cmd->iov_misc_count = 1;
3361 cmd->tx_size = tx_size;
3362
3363 return 0;
3364 }
3365
3366 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3367 {
3368 bool ret = false;
3369
3370 if (np->np_sockaddr.ss_family == AF_INET6) {
3371 const struct sockaddr_in6 sin6 = {
3372 .sin6_addr = IN6ADDR_ANY_INIT };
3373 struct sockaddr_in6 *sock_in6 =
3374 (struct sockaddr_in6 *)&np->np_sockaddr;
3375
3376 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3377 sin6.sin6_addr.s6_addr, 16))
3378 ret = true;
3379 } else {
3380 struct sockaddr_in * sock_in =
3381 (struct sockaddr_in *)&np->np_sockaddr;
3382
3383 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3384 ret = true;
3385 }
3386
3387 return ret;
3388 }
3389
3390 #define SENDTARGETS_BUF_LIMIT 32768U
3391
3392 static int
3393 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3394 enum iscsit_transport_type network_transport,
3395 int skip_bytes, bool *completed)
3396 {
3397 char *payload = NULL;
3398 struct iscsi_conn *conn = cmd->conn;
3399 struct iscsi_portal_group *tpg;
3400 struct iscsi_tiqn *tiqn;
3401 struct iscsi_tpg_np *tpg_np;
3402 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3403 int target_name_printed;
3404 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3405 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3406
3407 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3408 SENDTARGETS_BUF_LIMIT);
3409
3410 payload = kzalloc(buffer_len, GFP_KERNEL);
3411 if (!payload) {
3412 pr_err("Unable to allocate memory for sendtargets"
3413 " response.\n");
3414 return -ENOMEM;
3415 }
3416 /*
3417 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3418 * explicit case..
3419 */
3420 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3421 text_ptr = strchr(text_in, '=');
3422 if (!text_ptr) {
3423 pr_err("Unable to locate '=' string in text_in:"
3424 " %s\n", text_in);
3425 kfree(payload);
3426 return -EINVAL;
3427 }
3428 /*
3429 * Skip over '=' character..
3430 */
3431 text_ptr += 1;
3432 }
3433
3434 spin_lock(&tiqn_lock);
3435 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3436 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3437 strcmp(tiqn->tiqn, text_ptr)) {
3438 continue;
3439 }
3440
3441 target_name_printed = 0;
3442
3443 spin_lock(&tiqn->tiqn_tpg_lock);
3444 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3445
3446 /* If demo_mode_discovery=0 and generate_node_acls=0
3447 * (demo mode dislabed) do not return
3448 * TargetName+TargetAddress unless a NodeACL exists.
3449 */
3450
3451 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3452 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3453 (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3454 cmd->conn->sess->sess_ops->InitiatorName))) {
3455 continue;
3456 }
3457
3458 spin_lock(&tpg->tpg_state_lock);
3459 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3460 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3461 spin_unlock(&tpg->tpg_state_lock);
3462 continue;
3463 }
3464 spin_unlock(&tpg->tpg_state_lock);
3465
3466 spin_lock(&tpg->tpg_np_lock);
3467 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3468 tpg_np_list) {
3469 struct iscsi_np *np = tpg_np->tpg_np;
3470 bool inaddr_any = iscsit_check_inaddr_any(np);
3471
3472 if (np->np_network_transport != network_transport)
3473 continue;
3474
3475 if (!target_name_printed) {
3476 len = sprintf(buf, "TargetName=%s",
3477 tiqn->tiqn);
3478 len += 1;
3479
3480 if ((len + payload_len) > buffer_len) {
3481 spin_unlock(&tpg->tpg_np_lock);
3482 spin_unlock(&tiqn->tiqn_tpg_lock);
3483 end_of_buf = 1;
3484 goto eob;
3485 }
3486
3487 if (skip_bytes && len <= skip_bytes) {
3488 skip_bytes -= len;
3489 } else {
3490 memcpy(payload + payload_len, buf, len);
3491 payload_len += len;
3492 target_name_printed = 1;
3493 if (len > skip_bytes)
3494 skip_bytes = 0;
3495 }
3496 }
3497
3498 len = sprintf(buf, "TargetAddress="
3499 "%s:%hu,%hu",
3500 inaddr_any ? conn->local_ip : np->np_ip,
3501 np->np_port,
3502 tpg->tpgt);
3503 len += 1;
3504
3505 if ((len + payload_len) > buffer_len) {
3506 spin_unlock(&tpg->tpg_np_lock);
3507 spin_unlock(&tiqn->tiqn_tpg_lock);
3508 end_of_buf = 1;
3509 goto eob;
3510 }
3511
3512 if (skip_bytes && len <= skip_bytes) {
3513 skip_bytes -= len;
3514 } else {
3515 memcpy(payload + payload_len, buf, len);
3516 payload_len += len;
3517 if (len > skip_bytes)
3518 skip_bytes = 0;
3519 }
3520 }
3521 spin_unlock(&tpg->tpg_np_lock);
3522 }
3523 spin_unlock(&tiqn->tiqn_tpg_lock);
3524 eob:
3525 if (end_of_buf) {
3526 *completed = false;
3527 break;
3528 }
3529
3530 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3531 break;
3532 }
3533 spin_unlock(&tiqn_lock);
3534
3535 cmd->buf_ptr = payload;
3536
3537 return payload_len;
3538 }
3539
3540 int
3541 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3542 struct iscsi_text_rsp *hdr,
3543 enum iscsit_transport_type network_transport)
3544 {
3545 int text_length, padding;
3546 bool completed = true;
3547
3548 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3549 cmd->read_data_done,
3550 &completed);
3551 if (text_length < 0)
3552 return text_length;
3553
3554 if (completed) {
3555 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3556 } else {
3557 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3558 cmd->read_data_done += text_length;
3559 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3560 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3561 }
3562 hdr->opcode = ISCSI_OP_TEXT_RSP;
3563 padding = ((-text_length) & 3);
3564 hton24(hdr->dlength, text_length);
3565 hdr->itt = cmd->init_task_tag;
3566 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3567 cmd->stat_sn = conn->stat_sn++;
3568 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3569
3570 iscsit_increment_maxcmdsn(cmd, conn->sess);
3571 /*
3572 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3573 * correctly increment MaxCmdSN for each response answering a
3574 * non immediate text request with a valid CmdSN.
3575 */
3576 cmd->maxcmdsn_inc = 0;
3577 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3578 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3579
3580 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3581 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3582 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3583 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3584 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3585
3586 return text_length + padding;
3587 }
3588 EXPORT_SYMBOL(iscsit_build_text_rsp);
3589
3590 static int iscsit_send_text_rsp(
3591 struct iscsi_cmd *cmd,
3592 struct iscsi_conn *conn)
3593 {
3594 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3595 struct kvec *iov;
3596 u32 tx_size = 0;
3597 int text_length, iov_count = 0, rc;
3598
3599 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP);
3600 if (rc < 0)
3601 return rc;
3602
3603 text_length = rc;
3604 iov = &cmd->iov_misc[0];
3605 iov[iov_count].iov_base = cmd->pdu;
3606 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3607 iov[iov_count].iov_base = cmd->buf_ptr;
3608 iov[iov_count++].iov_len = text_length;
3609
3610 tx_size += (ISCSI_HDR_LEN + text_length);
3611
3612 if (conn->conn_ops->HeaderDigest) {
3613 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3614
3615 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3616 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3617
3618 iov[0].iov_len += ISCSI_CRC_LEN;
3619 tx_size += ISCSI_CRC_LEN;
3620 pr_debug("Attaching CRC32 HeaderDigest for"
3621 " Text Response PDU 0x%08x\n", *header_digest);
3622 }
3623
3624 if (conn->conn_ops->DataDigest) {
3625 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3626 cmd->buf_ptr, text_length,
3627 0, NULL, (u8 *)&cmd->data_crc);
3628
3629 iov[iov_count].iov_base = &cmd->data_crc;
3630 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3631 tx_size += ISCSI_CRC_LEN;
3632
3633 pr_debug("Attaching DataDigest for %u bytes of text"
3634 " data, CRC 0x%08x\n", text_length,
3635 cmd->data_crc);
3636 }
3637
3638 cmd->iov_misc_count = iov_count;
3639 cmd->tx_size = tx_size;
3640
3641 return 0;
3642 }
3643
3644 void
3645 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3646 struct iscsi_reject *hdr)
3647 {
3648 hdr->opcode = ISCSI_OP_REJECT;
3649 hdr->reason = cmd->reject_reason;
3650 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3651 hton24(hdr->dlength, ISCSI_HDR_LEN);
3652 hdr->ffffffff = cpu_to_be32(0xffffffff);
3653 cmd->stat_sn = conn->stat_sn++;
3654 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3655 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3656 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3657
3658 }
3659 EXPORT_SYMBOL(iscsit_build_reject);
3660
3661 static int iscsit_send_reject(
3662 struct iscsi_cmd *cmd,
3663 struct iscsi_conn *conn)
3664 {
3665 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3666 struct kvec *iov;
3667 u32 iov_count = 0, tx_size;
3668
3669 iscsit_build_reject(cmd, conn, hdr);
3670
3671 iov = &cmd->iov_misc[0];
3672 iov[iov_count].iov_base = cmd->pdu;
3673 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3674 iov[iov_count].iov_base = cmd->buf_ptr;
3675 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3676
3677 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3678
3679 if (conn->conn_ops->HeaderDigest) {
3680 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3681
3682 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3683 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3684
3685 iov[0].iov_len += ISCSI_CRC_LEN;
3686 tx_size += ISCSI_CRC_LEN;
3687 pr_debug("Attaching CRC32 HeaderDigest for"
3688 " REJECT PDU 0x%08x\n", *header_digest);
3689 }
3690
3691 if (conn->conn_ops->DataDigest) {
3692 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3693 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3694
3695 iov[iov_count].iov_base = &cmd->data_crc;
3696 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3697 tx_size += ISCSI_CRC_LEN;
3698 pr_debug("Attaching CRC32 DataDigest for REJECT"
3699 " PDU 0x%08x\n", cmd->data_crc);
3700 }
3701
3702 cmd->iov_misc_count = iov_count;
3703 cmd->tx_size = tx_size;
3704
3705 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3706 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3707
3708 return 0;
3709 }
3710
3711 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3712 {
3713 struct iscsi_thread_set *ts = conn->thread_set;
3714 int ord, cpu;
3715 /*
3716 * thread_id is assigned from iscsit_global->ts_bitmap from
3717 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3718 *
3719 * Here we use thread_id to determine which CPU that this
3720 * iSCSI connection's iscsi_thread_set will be scheduled to
3721 * execute upon.
3722 */
3723 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3724 for_each_online_cpu(cpu) {
3725 if (ord-- == 0) {
3726 cpumask_set_cpu(cpu, conn->conn_cpumask);
3727 return;
3728 }
3729 }
3730 /*
3731 * This should never be reached..
3732 */
3733 dump_stack();
3734 cpumask_setall(conn->conn_cpumask);
3735 }
3736
3737 static inline void iscsit_thread_check_cpumask(
3738 struct iscsi_conn *conn,
3739 struct task_struct *p,
3740 int mode)
3741 {
3742 /*
3743 * mode == 1 signals iscsi_target_tx_thread() usage.
3744 * mode == 0 signals iscsi_target_rx_thread() usage.
3745 */
3746 if (mode == 1) {
3747 if (!conn->conn_tx_reset_cpumask)
3748 return;
3749 conn->conn_tx_reset_cpumask = 0;
3750 } else {
3751 if (!conn->conn_rx_reset_cpumask)
3752 return;
3753 conn->conn_rx_reset_cpumask = 0;
3754 }
3755 /*
3756 * Update the CPU mask for this single kthread so that
3757 * both TX and RX kthreads are scheduled to run on the
3758 * same CPU.
3759 */
3760 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3761 }
3762
3763 static int
3764 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3765 {
3766 int ret;
3767
3768 switch (state) {
3769 case ISTATE_SEND_R2T:
3770 ret = iscsit_send_r2t(cmd, conn);
3771 if (ret < 0)
3772 goto err;
3773 break;
3774 case ISTATE_REMOVE:
3775 spin_lock_bh(&conn->cmd_lock);
3776 list_del_init(&cmd->i_conn_node);
3777 spin_unlock_bh(&conn->cmd_lock);
3778
3779 iscsit_free_cmd(cmd, false);
3780 break;
3781 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3782 iscsit_mod_nopin_response_timer(conn);
3783 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3784 if (ret < 0)
3785 goto err;
3786 break;
3787 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3788 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3789 if (ret < 0)
3790 goto err;
3791 break;
3792 default:
3793 pr_err("Unknown Opcode: 0x%02x ITT:"
3794 " 0x%08x, i_state: %d on CID: %hu\n",
3795 cmd->iscsi_opcode, cmd->init_task_tag, state,
3796 conn->cid);
3797 goto err;
3798 }
3799
3800 return 0;
3801
3802 err:
3803 return -1;
3804 }
3805
3806 static int
3807 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3808 {
3809 struct iscsit_transport *t = conn->conn_transport;
3810 struct iscsi_queue_req *qr;
3811 struct iscsi_cmd *cmd;
3812 u8 state;
3813 int ret;
3814
3815 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3816 atomic_set(&conn->check_immediate_queue, 0);
3817 cmd = qr->cmd;
3818 state = qr->state;
3819 kmem_cache_free(lio_qr_cache, qr);
3820
3821 ret = t->iscsit_immediate_queue(conn, cmd, state);
3822 if (ret < 0)
3823 return ret;
3824 }
3825
3826 return 0;
3827 }
3828
3829 static int
3830 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3831 {
3832 int ret;
3833
3834 check_rsp_state:
3835 switch (state) {
3836 case ISTATE_SEND_DATAIN:
3837 ret = iscsit_send_datain(cmd, conn);
3838 if (ret < 0)
3839 goto err;
3840 else if (!ret)
3841 /* more drs */
3842 goto check_rsp_state;
3843 else if (ret == 1) {
3844 /* all done */
3845 spin_lock_bh(&cmd->istate_lock);
3846 cmd->i_state = ISTATE_SENT_STATUS;
3847 spin_unlock_bh(&cmd->istate_lock);
3848
3849 if (atomic_read(&conn->check_immediate_queue))
3850 return 1;
3851
3852 return 0;
3853 } else if (ret == 2) {
3854 /* Still must send status,
3855 SCF_TRANSPORT_TASK_SENSE was set */
3856 spin_lock_bh(&cmd->istate_lock);
3857 cmd->i_state = ISTATE_SEND_STATUS;
3858 spin_unlock_bh(&cmd->istate_lock);
3859 state = ISTATE_SEND_STATUS;
3860 goto check_rsp_state;
3861 }
3862
3863 break;
3864 case ISTATE_SEND_STATUS:
3865 case ISTATE_SEND_STATUS_RECOVERY:
3866 ret = iscsit_send_response(cmd, conn);
3867 break;
3868 case ISTATE_SEND_LOGOUTRSP:
3869 ret = iscsit_send_logout(cmd, conn);
3870 break;
3871 case ISTATE_SEND_ASYNCMSG:
3872 ret = iscsit_send_conn_drop_async_message(
3873 cmd, conn);
3874 break;
3875 case ISTATE_SEND_NOPIN:
3876 ret = iscsit_send_nopin(cmd, conn);
3877 break;
3878 case ISTATE_SEND_REJECT:
3879 ret = iscsit_send_reject(cmd, conn);
3880 break;
3881 case ISTATE_SEND_TASKMGTRSP:
3882 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3883 if (ret != 0)
3884 break;
3885 ret = iscsit_tmr_post_handler(cmd, conn);
3886 if (ret != 0)
3887 iscsit_fall_back_to_erl0(conn->sess);
3888 break;
3889 case ISTATE_SEND_TEXTRSP:
3890 ret = iscsit_send_text_rsp(cmd, conn);
3891 break;
3892 default:
3893 pr_err("Unknown Opcode: 0x%02x ITT:"
3894 " 0x%08x, i_state: %d on CID: %hu\n",
3895 cmd->iscsi_opcode, cmd->init_task_tag,
3896 state, conn->cid);
3897 goto err;
3898 }
3899 if (ret < 0)
3900 goto err;
3901
3902 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3903 iscsit_tx_thread_wait_for_tcp(conn);
3904 iscsit_unmap_iovec(cmd);
3905 goto err;
3906 }
3907 iscsit_unmap_iovec(cmd);
3908
3909 switch (state) {
3910 case ISTATE_SEND_LOGOUTRSP:
3911 if (!iscsit_logout_post_handler(cmd, conn))
3912 goto restart;
3913 /* fall through */
3914 case ISTATE_SEND_STATUS:
3915 case ISTATE_SEND_ASYNCMSG:
3916 case ISTATE_SEND_NOPIN:
3917 case ISTATE_SEND_STATUS_RECOVERY:
3918 case ISTATE_SEND_TEXTRSP:
3919 case ISTATE_SEND_TASKMGTRSP:
3920 case ISTATE_SEND_REJECT:
3921 spin_lock_bh(&cmd->istate_lock);
3922 cmd->i_state = ISTATE_SENT_STATUS;
3923 spin_unlock_bh(&cmd->istate_lock);
3924 break;
3925 default:
3926 pr_err("Unknown Opcode: 0x%02x ITT:"
3927 " 0x%08x, i_state: %d on CID: %hu\n",
3928 cmd->iscsi_opcode, cmd->init_task_tag,
3929 cmd->i_state, conn->cid);
3930 goto err;
3931 }
3932
3933 if (atomic_read(&conn->check_immediate_queue))
3934 return 1;
3935
3936 return 0;
3937
3938 err:
3939 return -1;
3940 restart:
3941 return -EAGAIN;
3942 }
3943
3944 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3945 {
3946 struct iscsit_transport *t = conn->conn_transport;
3947 struct iscsi_queue_req *qr;
3948 struct iscsi_cmd *cmd;
3949 u8 state;
3950 int ret;
3951
3952 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3953 cmd = qr->cmd;
3954 state = qr->state;
3955 kmem_cache_free(lio_qr_cache, qr);
3956
3957 ret = t->iscsit_response_queue(conn, cmd, state);
3958 if (ret == 1 || ret < 0)
3959 return ret;
3960 }
3961
3962 return 0;
3963 }
3964
3965 int iscsi_target_tx_thread(void *arg)
3966 {
3967 int ret = 0;
3968 struct iscsi_conn *conn;
3969 struct iscsi_thread_set *ts = arg;
3970 /*
3971 * Allow ourselves to be interrupted by SIGINT so that a
3972 * connection recovery / failure event can be triggered externally.
3973 */
3974 allow_signal(SIGINT);
3975
3976 restart:
3977 conn = iscsi_tx_thread_pre_handler(ts);
3978 if (!conn)
3979 goto out;
3980
3981 ret = 0;
3982
3983 while (!kthread_should_stop()) {
3984 /*
3985 * Ensure that both TX and RX per connection kthreads
3986 * are scheduled to run on the same CPU.
3987 */
3988 iscsit_thread_check_cpumask(conn, current, 1);
3989
3990 wait_event_interruptible(conn->queues_wq,
3991 !iscsit_conn_all_queues_empty(conn) ||
3992 ts->status == ISCSI_THREAD_SET_RESET);
3993
3994 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3995 signal_pending(current))
3996 goto transport_err;
3997
3998 get_immediate:
3999 ret = iscsit_handle_immediate_queue(conn);
4000 if (ret < 0)
4001 goto transport_err;
4002
4003 ret = iscsit_handle_response_queue(conn);
4004 if (ret == 1)
4005 goto get_immediate;
4006 else if (ret == -EAGAIN)
4007 goto restart;
4008 else if (ret < 0)
4009 goto transport_err;
4010 }
4011
4012 transport_err:
4013 iscsit_take_action_for_connection_exit(conn);
4014 goto restart;
4015 out:
4016 return 0;
4017 }
4018
4019 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
4020 {
4021 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
4022 struct iscsi_cmd *cmd;
4023 int ret = 0;
4024
4025 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
4026 case ISCSI_OP_SCSI_CMD:
4027 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4028 if (!cmd)
4029 goto reject;
4030
4031 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
4032 break;
4033 case ISCSI_OP_SCSI_DATA_OUT:
4034 ret = iscsit_handle_data_out(conn, buf);
4035 break;
4036 case ISCSI_OP_NOOP_OUT:
4037 cmd = NULL;
4038 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4039 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4040 if (!cmd)
4041 goto reject;
4042 }
4043 ret = iscsit_handle_nop_out(conn, cmd, buf);
4044 break;
4045 case ISCSI_OP_SCSI_TMFUNC:
4046 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4047 if (!cmd)
4048 goto reject;
4049
4050 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4051 break;
4052 case ISCSI_OP_TEXT:
4053 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4054 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4055 if (!cmd)
4056 goto reject;
4057 } else {
4058 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4059 if (!cmd)
4060 goto reject;
4061 }
4062
4063 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4064 break;
4065 case ISCSI_OP_LOGOUT:
4066 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4067 if (!cmd)
4068 goto reject;
4069
4070 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4071 if (ret > 0)
4072 wait_for_completion_timeout(&conn->conn_logout_comp,
4073 SECONDS_FOR_LOGOUT_COMP * HZ);
4074 break;
4075 case ISCSI_OP_SNACK:
4076 ret = iscsit_handle_snack(conn, buf);
4077 break;
4078 default:
4079 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4080 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4081 pr_err("Cannot recover from unknown"
4082 " opcode while ERL=0, closing iSCSI connection.\n");
4083 return -1;
4084 }
4085 if (!conn->conn_ops->OFMarker) {
4086 pr_err("Unable to recover from unknown"
4087 " opcode while OFMarker=No, closing iSCSI"
4088 " connection.\n");
4089 return -1;
4090 }
4091 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4092 pr_err("Unable to recover from unknown"
4093 " opcode, closing iSCSI connection.\n");
4094 return -1;
4095 }
4096 break;
4097 }
4098
4099 return ret;
4100 reject:
4101 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4102 }
4103
4104 int iscsi_target_rx_thread(void *arg)
4105 {
4106 int ret;
4107 u8 buffer[ISCSI_HDR_LEN], opcode;
4108 u32 checksum = 0, digest = 0;
4109 struct iscsi_conn *conn = NULL;
4110 struct iscsi_thread_set *ts = arg;
4111 struct kvec iov;
4112 /*
4113 * Allow ourselves to be interrupted by SIGINT so that a
4114 * connection recovery / failure event can be triggered externally.
4115 */
4116 allow_signal(SIGINT);
4117
4118 restart:
4119 conn = iscsi_rx_thread_pre_handler(ts);
4120 if (!conn)
4121 goto out;
4122
4123 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4124 struct completion comp;
4125 int rc;
4126
4127 init_completion(&comp);
4128 rc = wait_for_completion_interruptible(&comp);
4129 if (rc < 0)
4130 goto transport_err;
4131
4132 goto out;
4133 }
4134
4135 while (!kthread_should_stop()) {
4136 /*
4137 * Ensure that both TX and RX per connection kthreads
4138 * are scheduled to run on the same CPU.
4139 */
4140 iscsit_thread_check_cpumask(conn, current, 0);
4141
4142 memset(buffer, 0, ISCSI_HDR_LEN);
4143 memset(&iov, 0, sizeof(struct kvec));
4144
4145 iov.iov_base = buffer;
4146 iov.iov_len = ISCSI_HDR_LEN;
4147
4148 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4149 if (ret != ISCSI_HDR_LEN) {
4150 iscsit_rx_thread_wait_for_tcp(conn);
4151 goto transport_err;
4152 }
4153
4154 if (conn->conn_ops->HeaderDigest) {
4155 iov.iov_base = &digest;
4156 iov.iov_len = ISCSI_CRC_LEN;
4157
4158 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4159 if (ret != ISCSI_CRC_LEN) {
4160 iscsit_rx_thread_wait_for_tcp(conn);
4161 goto transport_err;
4162 }
4163
4164 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4165 buffer, ISCSI_HDR_LEN,
4166 0, NULL, (u8 *)&checksum);
4167
4168 if (digest != checksum) {
4169 pr_err("HeaderDigest CRC32C failed,"
4170 " received 0x%08x, computed 0x%08x\n",
4171 digest, checksum);
4172 /*
4173 * Set the PDU to 0xff so it will intentionally
4174 * hit default in the switch below.
4175 */
4176 memset(buffer, 0xff, ISCSI_HDR_LEN);
4177 atomic_long_inc(&conn->sess->conn_digest_errors);
4178 } else {
4179 pr_debug("Got HeaderDigest CRC32C"
4180 " 0x%08x\n", checksum);
4181 }
4182 }
4183
4184 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4185 goto transport_err;
4186
4187 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4188
4189 if (conn->sess->sess_ops->SessionType &&
4190 ((!(opcode & ISCSI_OP_TEXT)) ||
4191 (!(opcode & ISCSI_OP_LOGOUT)))) {
4192 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4193 " while in Discovery Session, rejecting.\n", opcode);
4194 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4195 buffer);
4196 goto transport_err;
4197 }
4198
4199 ret = iscsi_target_rx_opcode(conn, buffer);
4200 if (ret < 0)
4201 goto transport_err;
4202 }
4203
4204 transport_err:
4205 if (!signal_pending(current))
4206 atomic_set(&conn->transport_failed, 1);
4207 iscsit_take_action_for_connection_exit(conn);
4208 goto restart;
4209 out:
4210 return 0;
4211 }
4212
4213 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4214 {
4215 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4216 struct iscsi_session *sess = conn->sess;
4217 /*
4218 * We expect this function to only ever be called from either RX or TX
4219 * thread context via iscsit_close_connection() once the other context
4220 * has been reset -> returned sleeping pre-handler state.
4221 */
4222 spin_lock_bh(&conn->cmd_lock);
4223 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4224
4225 list_del_init(&cmd->i_conn_node);
4226 spin_unlock_bh(&conn->cmd_lock);
4227
4228 iscsit_increment_maxcmdsn(cmd, sess);
4229
4230 iscsit_free_cmd(cmd, true);
4231
4232 spin_lock_bh(&conn->cmd_lock);
4233 }
4234 spin_unlock_bh(&conn->cmd_lock);
4235 }
4236
4237 static void iscsit_stop_timers_for_cmds(
4238 struct iscsi_conn *conn)
4239 {
4240 struct iscsi_cmd *cmd;
4241
4242 spin_lock_bh(&conn->cmd_lock);
4243 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4244 if (cmd->data_direction == DMA_TO_DEVICE)
4245 iscsit_stop_dataout_timer(cmd);
4246 }
4247 spin_unlock_bh(&conn->cmd_lock);
4248 }
4249
4250 int iscsit_close_connection(
4251 struct iscsi_conn *conn)
4252 {
4253 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4254 struct iscsi_session *sess = conn->sess;
4255
4256 pr_debug("Closing iSCSI connection CID %hu on SID:"
4257 " %u\n", conn->cid, sess->sid);
4258 /*
4259 * Always up conn_logout_comp just in case the RX Thread is sleeping
4260 * and the logout response never got sent because the connection
4261 * failed.
4262 */
4263 complete(&conn->conn_logout_comp);
4264
4265 iscsi_release_thread_set(conn);
4266
4267 iscsit_stop_timers_for_cmds(conn);
4268 iscsit_stop_nopin_response_timer(conn);
4269 iscsit_stop_nopin_timer(conn);
4270
4271 if (conn->conn_transport->iscsit_wait_conn)
4272 conn->conn_transport->iscsit_wait_conn(conn);
4273
4274 /*
4275 * During Connection recovery drop unacknowledged out of order
4276 * commands for this connection, and prepare the other commands
4277 * for realligence.
4278 *
4279 * During normal operation clear the out of order commands (but
4280 * do not free the struct iscsi_ooo_cmdsn's) and release all
4281 * struct iscsi_cmds.
4282 */
4283 if (atomic_read(&conn->connection_recovery)) {
4284 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4285 iscsit_prepare_cmds_for_realligance(conn);
4286 } else {
4287 iscsit_clear_ooo_cmdsns_for_conn(conn);
4288 iscsit_release_commands_from_conn(conn);
4289 }
4290 iscsit_free_queue_reqs_for_conn(conn);
4291
4292 /*
4293 * Handle decrementing session or connection usage count if
4294 * a logout response was not able to be sent because the
4295 * connection failed. Fall back to Session Recovery here.
4296 */
4297 if (atomic_read(&conn->conn_logout_remove)) {
4298 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4299 iscsit_dec_conn_usage_count(conn);
4300 iscsit_dec_session_usage_count(sess);
4301 }
4302 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4303 iscsit_dec_conn_usage_count(conn);
4304
4305 atomic_set(&conn->conn_logout_remove, 0);
4306 atomic_set(&sess->session_reinstatement, 0);
4307 atomic_set(&sess->session_fall_back_to_erl0, 1);
4308 }
4309
4310 spin_lock_bh(&sess->conn_lock);
4311 list_del(&conn->conn_list);
4312
4313 /*
4314 * Attempt to let the Initiator know this connection failed by
4315 * sending an Connection Dropped Async Message on another
4316 * active connection.
4317 */
4318 if (atomic_read(&conn->connection_recovery))
4319 iscsit_build_conn_drop_async_message(conn);
4320
4321 spin_unlock_bh(&sess->conn_lock);
4322
4323 /*
4324 * If connection reinstatement is being performed on this connection,
4325 * up the connection reinstatement semaphore that is being blocked on
4326 * in iscsit_cause_connection_reinstatement().
4327 */
4328 spin_lock_bh(&conn->state_lock);
4329 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4330 spin_unlock_bh(&conn->state_lock);
4331 complete(&conn->conn_wait_comp);
4332 wait_for_completion(&conn->conn_post_wait_comp);
4333 spin_lock_bh(&conn->state_lock);
4334 }
4335
4336 /*
4337 * If connection reinstatement is being performed on this connection
4338 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4339 * connection wait rcfr semaphore that is being blocked on
4340 * an iscsit_connection_reinstatement_rcfr().
4341 */
4342 if (atomic_read(&conn->connection_wait_rcfr)) {
4343 spin_unlock_bh(&conn->state_lock);
4344 complete(&conn->conn_wait_rcfr_comp);
4345 wait_for_completion(&conn->conn_post_wait_comp);
4346 spin_lock_bh(&conn->state_lock);
4347 }
4348 atomic_set(&conn->connection_reinstatement, 1);
4349 spin_unlock_bh(&conn->state_lock);
4350
4351 /*
4352 * If any other processes are accessing this connection pointer we
4353 * must wait until they have completed.
4354 */
4355 iscsit_check_conn_usage_count(conn);
4356
4357 if (conn->conn_rx_hash.tfm)
4358 crypto_free_hash(conn->conn_rx_hash.tfm);
4359 if (conn->conn_tx_hash.tfm)
4360 crypto_free_hash(conn->conn_tx_hash.tfm);
4361
4362 free_cpumask_var(conn->conn_cpumask);
4363
4364 kfree(conn->conn_ops);
4365 conn->conn_ops = NULL;
4366
4367 if (conn->sock)
4368 sock_release(conn->sock);
4369
4370 if (conn->conn_transport->iscsit_free_conn)
4371 conn->conn_transport->iscsit_free_conn(conn);
4372
4373 iscsit_put_transport(conn->conn_transport);
4374
4375 conn->thread_set = NULL;
4376
4377 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4378 conn->conn_state = TARG_CONN_STATE_FREE;
4379 kfree(conn);
4380
4381 spin_lock_bh(&sess->conn_lock);
4382 atomic_dec(&sess->nconn);
4383 pr_debug("Decremented iSCSI connection count to %hu from node:"
4384 " %s\n", atomic_read(&sess->nconn),
4385 sess->sess_ops->InitiatorName);
4386 /*
4387 * Make sure that if one connection fails in an non ERL=2 iSCSI
4388 * Session that they all fail.
4389 */
4390 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4391 !atomic_read(&sess->session_logout))
4392 atomic_set(&sess->session_fall_back_to_erl0, 1);
4393
4394 /*
4395 * If this was not the last connection in the session, and we are
4396 * performing session reinstatement or falling back to ERL=0, call
4397 * iscsit_stop_session() without sleeping to shutdown the other
4398 * active connections.
4399 */
4400 if (atomic_read(&sess->nconn)) {
4401 if (!atomic_read(&sess->session_reinstatement) &&
4402 !atomic_read(&sess->session_fall_back_to_erl0)) {
4403 spin_unlock_bh(&sess->conn_lock);
4404 return 0;
4405 }
4406 if (!atomic_read(&sess->session_stop_active)) {
4407 atomic_set(&sess->session_stop_active, 1);
4408 spin_unlock_bh(&sess->conn_lock);
4409 iscsit_stop_session(sess, 0, 0);
4410 return 0;
4411 }
4412 spin_unlock_bh(&sess->conn_lock);
4413 return 0;
4414 }
4415
4416 /*
4417 * If this was the last connection in the session and one of the
4418 * following is occurring:
4419 *
4420 * Session Reinstatement is not being performed, and are falling back
4421 * to ERL=0 call iscsit_close_session().
4422 *
4423 * Session Logout was requested. iscsit_close_session() will be called
4424 * elsewhere.
4425 *
4426 * Session Continuation is not being performed, start the Time2Retain
4427 * handler and check if sleep_on_sess_wait_sem is active.
4428 */
4429 if (!atomic_read(&sess->session_reinstatement) &&
4430 atomic_read(&sess->session_fall_back_to_erl0)) {
4431 spin_unlock_bh(&sess->conn_lock);
4432 target_put_session(sess->se_sess);
4433
4434 return 0;
4435 } else if (atomic_read(&sess->session_logout)) {
4436 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4437 sess->session_state = TARG_SESS_STATE_FREE;
4438 spin_unlock_bh(&sess->conn_lock);
4439
4440 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4441 complete(&sess->session_wait_comp);
4442
4443 return 0;
4444 } else {
4445 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4446 sess->session_state = TARG_SESS_STATE_FAILED;
4447
4448 if (!atomic_read(&sess->session_continuation)) {
4449 spin_unlock_bh(&sess->conn_lock);
4450 iscsit_start_time2retain_handler(sess);
4451 } else
4452 spin_unlock_bh(&sess->conn_lock);
4453
4454 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4455 complete(&sess->session_wait_comp);
4456
4457 return 0;
4458 }
4459 spin_unlock_bh(&sess->conn_lock);
4460
4461 return 0;
4462 }
4463
4464 int iscsit_close_session(struct iscsi_session *sess)
4465 {
4466 struct iscsi_portal_group *tpg = sess->tpg;
4467 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4468
4469 if (atomic_read(&sess->nconn)) {
4470 pr_err("%d connection(s) still exist for iSCSI session"
4471 " to %s\n", atomic_read(&sess->nconn),
4472 sess->sess_ops->InitiatorName);
4473 BUG();
4474 }
4475
4476 spin_lock_bh(&se_tpg->session_lock);
4477 atomic_set(&sess->session_logout, 1);
4478 atomic_set(&sess->session_reinstatement, 1);
4479 iscsit_stop_time2retain_timer(sess);
4480 spin_unlock_bh(&se_tpg->session_lock);
4481
4482 /*
4483 * transport_deregister_session_configfs() will clear the
4484 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4485 * can be setting it again with __transport_register_session() in
4486 * iscsi_post_login_handler() again after the iscsit_stop_session()
4487 * completes in iscsi_np context.
4488 */
4489 transport_deregister_session_configfs(sess->se_sess);
4490
4491 /*
4492 * If any other processes are accessing this session pointer we must
4493 * wait until they have completed. If we are in an interrupt (the
4494 * time2retain handler) and contain and active session usage count we
4495 * restart the timer and exit.
4496 */
4497 if (!in_interrupt()) {
4498 if (iscsit_check_session_usage_count(sess) == 1)
4499 iscsit_stop_session(sess, 1, 1);
4500 } else {
4501 if (iscsit_check_session_usage_count(sess) == 2) {
4502 atomic_set(&sess->session_logout, 0);
4503 iscsit_start_time2retain_handler(sess);
4504 return 0;
4505 }
4506 }
4507
4508 transport_deregister_session(sess->se_sess);
4509
4510 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4511 iscsit_free_connection_recovery_entires(sess);
4512
4513 iscsit_free_all_ooo_cmdsns(sess);
4514
4515 spin_lock_bh(&se_tpg->session_lock);
4516 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4517 sess->session_state = TARG_SESS_STATE_FREE;
4518 pr_debug("Released iSCSI session from node: %s\n",
4519 sess->sess_ops->InitiatorName);
4520 tpg->nsessions--;
4521 if (tpg->tpg_tiqn)
4522 tpg->tpg_tiqn->tiqn_nsessions--;
4523
4524 pr_debug("Decremented number of active iSCSI Sessions on"
4525 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4526
4527 spin_lock(&sess_idr_lock);
4528 idr_remove(&sess_idr, sess->session_index);
4529 spin_unlock(&sess_idr_lock);
4530
4531 kfree(sess->sess_ops);
4532 sess->sess_ops = NULL;
4533 spin_unlock_bh(&se_tpg->session_lock);
4534
4535 kfree(sess);
4536 return 0;
4537 }
4538
4539 static void iscsit_logout_post_handler_closesession(
4540 struct iscsi_conn *conn)
4541 {
4542 struct iscsi_session *sess = conn->sess;
4543
4544 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4545 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4546
4547 atomic_set(&conn->conn_logout_remove, 0);
4548 complete(&conn->conn_logout_comp);
4549
4550 iscsit_dec_conn_usage_count(conn);
4551 iscsit_stop_session(sess, 1, 1);
4552 iscsit_dec_session_usage_count(sess);
4553 target_put_session(sess->se_sess);
4554 }
4555
4556 static void iscsit_logout_post_handler_samecid(
4557 struct iscsi_conn *conn)
4558 {
4559 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4560 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4561
4562 atomic_set(&conn->conn_logout_remove, 0);
4563 complete(&conn->conn_logout_comp);
4564
4565 iscsit_cause_connection_reinstatement(conn, 1);
4566 iscsit_dec_conn_usage_count(conn);
4567 }
4568
4569 static void iscsit_logout_post_handler_diffcid(
4570 struct iscsi_conn *conn,
4571 u16 cid)
4572 {
4573 struct iscsi_conn *l_conn;
4574 struct iscsi_session *sess = conn->sess;
4575 bool conn_found = false;
4576
4577 if (!sess)
4578 return;
4579
4580 spin_lock_bh(&sess->conn_lock);
4581 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4582 if (l_conn->cid == cid) {
4583 iscsit_inc_conn_usage_count(l_conn);
4584 conn_found = true;
4585 break;
4586 }
4587 }
4588 spin_unlock_bh(&sess->conn_lock);
4589
4590 if (!conn_found)
4591 return;
4592
4593 if (l_conn->sock)
4594 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4595
4596 spin_lock_bh(&l_conn->state_lock);
4597 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4598 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4599 spin_unlock_bh(&l_conn->state_lock);
4600
4601 iscsit_cause_connection_reinstatement(l_conn, 1);
4602 iscsit_dec_conn_usage_count(l_conn);
4603 }
4604
4605 /*
4606 * Return of 0 causes the TX thread to restart.
4607 */
4608 int iscsit_logout_post_handler(
4609 struct iscsi_cmd *cmd,
4610 struct iscsi_conn *conn)
4611 {
4612 int ret = 0;
4613
4614 switch (cmd->logout_reason) {
4615 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4616 switch (cmd->logout_response) {
4617 case ISCSI_LOGOUT_SUCCESS:
4618 case ISCSI_LOGOUT_CLEANUP_FAILED:
4619 default:
4620 iscsit_logout_post_handler_closesession(conn);
4621 break;
4622 }
4623 ret = 0;
4624 break;
4625 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4626 if (conn->cid == cmd->logout_cid) {
4627 switch (cmd->logout_response) {
4628 case ISCSI_LOGOUT_SUCCESS:
4629 case ISCSI_LOGOUT_CLEANUP_FAILED:
4630 default:
4631 iscsit_logout_post_handler_samecid(conn);
4632 break;
4633 }
4634 ret = 0;
4635 } else {
4636 switch (cmd->logout_response) {
4637 case ISCSI_LOGOUT_SUCCESS:
4638 iscsit_logout_post_handler_diffcid(conn,
4639 cmd->logout_cid);
4640 break;
4641 case ISCSI_LOGOUT_CID_NOT_FOUND:
4642 case ISCSI_LOGOUT_CLEANUP_FAILED:
4643 default:
4644 break;
4645 }
4646 ret = 1;
4647 }
4648 break;
4649 case ISCSI_LOGOUT_REASON_RECOVERY:
4650 switch (cmd->logout_response) {
4651 case ISCSI_LOGOUT_SUCCESS:
4652 case ISCSI_LOGOUT_CID_NOT_FOUND:
4653 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4654 case ISCSI_LOGOUT_CLEANUP_FAILED:
4655 default:
4656 break;
4657 }
4658 ret = 1;
4659 break;
4660 default:
4661 break;
4662
4663 }
4664 return ret;
4665 }
4666 EXPORT_SYMBOL(iscsit_logout_post_handler);
4667
4668 void iscsit_fail_session(struct iscsi_session *sess)
4669 {
4670 struct iscsi_conn *conn;
4671
4672 spin_lock_bh(&sess->conn_lock);
4673 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4674 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4675 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4676 }
4677 spin_unlock_bh(&sess->conn_lock);
4678
4679 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4680 sess->session_state = TARG_SESS_STATE_FAILED;
4681 }
4682
4683 int iscsit_free_session(struct iscsi_session *sess)
4684 {
4685 u16 conn_count = atomic_read(&sess->nconn);
4686 struct iscsi_conn *conn, *conn_tmp = NULL;
4687 int is_last;
4688
4689 spin_lock_bh(&sess->conn_lock);
4690 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4691
4692 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4693 conn_list) {
4694 if (conn_count == 0)
4695 break;
4696
4697 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4698 is_last = 1;
4699 } else {
4700 iscsit_inc_conn_usage_count(conn_tmp);
4701 is_last = 0;
4702 }
4703 iscsit_inc_conn_usage_count(conn);
4704
4705 spin_unlock_bh(&sess->conn_lock);
4706 iscsit_cause_connection_reinstatement(conn, 1);
4707 spin_lock_bh(&sess->conn_lock);
4708
4709 iscsit_dec_conn_usage_count(conn);
4710 if (is_last == 0)
4711 iscsit_dec_conn_usage_count(conn_tmp);
4712
4713 conn_count--;
4714 }
4715
4716 if (atomic_read(&sess->nconn)) {
4717 spin_unlock_bh(&sess->conn_lock);
4718 wait_for_completion(&sess->session_wait_comp);
4719 } else
4720 spin_unlock_bh(&sess->conn_lock);
4721
4722 target_put_session(sess->se_sess);
4723 return 0;
4724 }
4725
4726 void iscsit_stop_session(
4727 struct iscsi_session *sess,
4728 int session_sleep,
4729 int connection_sleep)
4730 {
4731 u16 conn_count = atomic_read(&sess->nconn);
4732 struct iscsi_conn *conn, *conn_tmp = NULL;
4733 int is_last;
4734
4735 spin_lock_bh(&sess->conn_lock);
4736 if (session_sleep)
4737 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4738
4739 if (connection_sleep) {
4740 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4741 conn_list) {
4742 if (conn_count == 0)
4743 break;
4744
4745 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4746 is_last = 1;
4747 } else {
4748 iscsit_inc_conn_usage_count(conn_tmp);
4749 is_last = 0;
4750 }
4751 iscsit_inc_conn_usage_count(conn);
4752
4753 spin_unlock_bh(&sess->conn_lock);
4754 iscsit_cause_connection_reinstatement(conn, 1);
4755 spin_lock_bh(&sess->conn_lock);
4756
4757 iscsit_dec_conn_usage_count(conn);
4758 if (is_last == 0)
4759 iscsit_dec_conn_usage_count(conn_tmp);
4760 conn_count--;
4761 }
4762 } else {
4763 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4764 iscsit_cause_connection_reinstatement(conn, 0);
4765 }
4766
4767 if (session_sleep && atomic_read(&sess->nconn)) {
4768 spin_unlock_bh(&sess->conn_lock);
4769 wait_for_completion(&sess->session_wait_comp);
4770 } else
4771 spin_unlock_bh(&sess->conn_lock);
4772 }
4773
4774 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4775 {
4776 struct iscsi_session *sess;
4777 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4778 struct se_session *se_sess, *se_sess_tmp;
4779 int session_count = 0;
4780
4781 spin_lock_bh(&se_tpg->session_lock);
4782 if (tpg->nsessions && !force) {
4783 spin_unlock_bh(&se_tpg->session_lock);
4784 return -1;
4785 }
4786
4787 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4788 sess_list) {
4789 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4790
4791 spin_lock(&sess->conn_lock);
4792 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4793 atomic_read(&sess->session_logout) ||
4794 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4795 spin_unlock(&sess->conn_lock);
4796 continue;
4797 }
4798 atomic_set(&sess->session_reinstatement, 1);
4799 spin_unlock(&sess->conn_lock);
4800 spin_unlock_bh(&se_tpg->session_lock);
4801
4802 iscsit_free_session(sess);
4803 spin_lock_bh(&se_tpg->session_lock);
4804
4805 session_count++;
4806 }
4807 spin_unlock_bh(&se_tpg->session_lock);
4808
4809 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4810 " Group: %hu\n", session_count, tpg->tpgt);
4811 return 0;
4812 }
4813
4814 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4815 MODULE_VERSION("4.1.x");
4816 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4817 MODULE_LICENSE("GPL");
4818
4819 module_init(iscsi_target_init_module);
4820 module_exit(iscsi_target_cleanup_module);
Linux kernel - Deliverables
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