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