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net: qmi_wwan: add Olivetti Olicard 500
[linux/fpc-iii.git] / drivers / target / iscsi / iscsi_target.c
blob78cab13bbb1be3796b0e00af4a0667329ed4a2d8
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 BUG_ON(!cmd);
1597
1598 spin_lock_bh(&conn->cmd_lock);
1599 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1600 spin_unlock_bh(&conn->cmd_lock);
1601
1602 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1603
1604 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1605 iscsit_add_cmd_to_response_queue(cmd, conn,
1606 cmd->i_state);
1607 return 0;
1608 }
1609
1610 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1611 (unsigned char *)hdr, hdr->cmdsn);
1612 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1613 return 0;
1614 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1615 return -1;
1616
1617 return 0;
1618 }
1619 /*
1620 * This was a response to a unsolicited NOPIN ping.
1621 */
1622 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1623 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1624 if (!cmd_p)
1625 return -EINVAL;
1626
1627 iscsit_stop_nopin_response_timer(conn);
1628
1629 cmd_p->i_state = ISTATE_REMOVE;
1630 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1631
1632 iscsit_start_nopin_timer(conn);
1633 return 0;
1634 }
1635 /*
1636 * Otherwise, initiator is not expecting a NOPIN is response.
1637 * Just ignore for now.
1638 */
1639 return 0;
1640 }
1641 EXPORT_SYMBOL(iscsit_process_nop_out);
1642
1643 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1644 unsigned char *buf)
1645 {
1646 unsigned char *ping_data = NULL;
1647 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1648 struct kvec *iov = NULL;
1649 u32 payload_length = ntoh24(hdr->dlength);
1650 int ret;
1651
1652 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1653 if (ret < 0)
1654 return 0;
1655 /*
1656 * Handle NOP-OUT payload for traditional iSCSI sockets
1657 */
1658 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1659 u32 checksum, data_crc, padding = 0;
1660 int niov = 0, rx_got, rx_size = payload_length;
1661
1662 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1663 if (!ping_data) {
1664 pr_err("Unable to allocate memory for"
1665 " NOPOUT ping data.\n");
1666 ret = -1;
1667 goto out;
1668 }
1669
1670 iov = &cmd->iov_misc[0];
1671 iov[niov].iov_base = ping_data;
1672 iov[niov++].iov_len = payload_length;
1673
1674 padding = ((-payload_length) & 3);
1675 if (padding != 0) {
1676 pr_debug("Receiving %u additional bytes"
1677 " for padding.\n", padding);
1678 iov[niov].iov_base = &cmd->pad_bytes;
1679 iov[niov++].iov_len = padding;
1680 rx_size += padding;
1681 }
1682 if (conn->conn_ops->DataDigest) {
1683 iov[niov].iov_base = &checksum;
1684 iov[niov++].iov_len = ISCSI_CRC_LEN;
1685 rx_size += ISCSI_CRC_LEN;
1686 }
1687
1688 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1689 if (rx_got != rx_size) {
1690 ret = -1;
1691 goto out;
1692 }
1693
1694 if (conn->conn_ops->DataDigest) {
1695 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1696 ping_data, payload_length,
1697 padding, cmd->pad_bytes,
1698 (u8 *)&data_crc);
1699
1700 if (checksum != data_crc) {
1701 pr_err("Ping data CRC32C DataDigest"
1702 " 0x%08x does not match computed 0x%08x\n",
1703 checksum, data_crc);
1704 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1705 pr_err("Unable to recover from"
1706 " NOPOUT Ping DataCRC failure while in"
1707 " ERL=0.\n");
1708 ret = -1;
1709 goto out;
1710 } else {
1711 /*
1712 * Silently drop this PDU and let the
1713 * initiator plug the CmdSN gap.
1714 */
1715 pr_debug("Dropping NOPOUT"
1716 " Command CmdSN: 0x%08x due to"
1717 " DataCRC error.\n", hdr->cmdsn);
1718 ret = 0;
1719 goto out;
1720 }
1721 } else {
1722 pr_debug("Got CRC32C DataDigest"
1723 " 0x%08x for %u bytes of ping data.\n",
1724 checksum, payload_length);
1725 }
1726 }
1727
1728 ping_data[payload_length] = '\0';
1729 /*
1730 * Attach ping data to struct iscsi_cmd->buf_ptr.
1731 */
1732 cmd->buf_ptr = ping_data;
1733 cmd->buf_ptr_size = payload_length;
1734
1735 pr_debug("Got %u bytes of NOPOUT ping"
1736 " data.\n", payload_length);
1737 pr_debug("Ping Data: \"%s\"\n", ping_data);
1738 }
1739
1740 return iscsit_process_nop_out(conn, cmd, hdr);
1741 out:
1742 if (cmd)
1743 iscsit_free_cmd(cmd, false);
1744
1745 kfree(ping_data);
1746 return ret;
1747 }
1748
1749 int
1750 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1751 unsigned char *buf)
1752 {
1753 struct se_tmr_req *se_tmr;
1754 struct iscsi_tmr_req *tmr_req;
1755 struct iscsi_tm *hdr;
1756 int out_of_order_cmdsn = 0, ret;
1757 bool sess_ref = false;
1758 u8 function;
1759
1760 hdr = (struct iscsi_tm *) buf;
1761 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1762 function = hdr->flags;
1763
1764 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1765 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1766 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1767 hdr->rtt, hdr->refcmdsn, conn->cid);
1768
1769 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1770 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1771 hdr->rtt != RESERVED_ITT)) {
1772 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1773 hdr->rtt = RESERVED_ITT;
1774 }
1775
1776 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1777 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1778 pr_err("Task Management Request TASK_REASSIGN not"
1779 " issued as immediate command, bad iSCSI Initiator"
1780 "implementation\n");
1781 return iscsit_add_reject_cmd(cmd,
1782 ISCSI_REASON_PROTOCOL_ERROR, buf);
1783 }
1784 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1785 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1786 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1787
1788 cmd->data_direction = DMA_NONE;
1789
1790 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1791 if (!cmd->tmr_req) {
1792 pr_err("Unable to allocate memory for"
1793 " Task Management command!\n");
1794 return iscsit_add_reject_cmd(cmd,
1795 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1796 buf);
1797 }
1798
1799 /*
1800 * TASK_REASSIGN for ERL=2 / connection stays inside of
1801 * LIO-Target $FABRIC_MOD
1802 */
1803 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1804
1805 u8 tcm_function;
1806 int ret;
1807
1808 transport_init_se_cmd(&cmd->se_cmd,
1809 &lio_target_fabric_configfs->tf_ops,
1810 conn->sess->se_sess, 0, DMA_NONE,
1811 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1812
1813 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1814 sess_ref = true;
1815
1816 switch (function) {
1817 case ISCSI_TM_FUNC_ABORT_TASK:
1818 tcm_function = TMR_ABORT_TASK;
1819 break;
1820 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1821 tcm_function = TMR_ABORT_TASK_SET;
1822 break;
1823 case ISCSI_TM_FUNC_CLEAR_ACA:
1824 tcm_function = TMR_CLEAR_ACA;
1825 break;
1826 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1827 tcm_function = TMR_CLEAR_TASK_SET;
1828 break;
1829 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1830 tcm_function = TMR_LUN_RESET;
1831 break;
1832 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1833 tcm_function = TMR_TARGET_WARM_RESET;
1834 break;
1835 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1836 tcm_function = TMR_TARGET_COLD_RESET;
1837 break;
1838 default:
1839 pr_err("Unknown iSCSI TMR Function:"
1840 " 0x%02x\n", function);
1841 return iscsit_add_reject_cmd(cmd,
1842 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1843 }
1844
1845 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1846 tcm_function, GFP_KERNEL);
1847 if (ret < 0)
1848 return iscsit_add_reject_cmd(cmd,
1849 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1850
1851 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1852 }
1853
1854 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1855 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1856 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1857 cmd->init_task_tag = hdr->itt;
1858 cmd->targ_xfer_tag = 0xFFFFFFFF;
1859 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1860 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1861 se_tmr = cmd->se_cmd.se_tmr_req;
1862 tmr_req = cmd->tmr_req;
1863 /*
1864 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1865 */
1866 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1867 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1868 scsilun_to_int(&hdr->lun));
1869 if (ret < 0) {
1870 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1871 goto attach;
1872 }
1873 }
1874
1875 switch (function) {
1876 case ISCSI_TM_FUNC_ABORT_TASK:
1877 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1878 if (se_tmr->response)
1879 goto attach;
1880 break;
1881 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1882 case ISCSI_TM_FUNC_CLEAR_ACA:
1883 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1884 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1885 break;
1886 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1887 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1888 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1889 goto attach;
1890 }
1891 break;
1892 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1893 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1894 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1895 goto attach;
1896 }
1897 break;
1898 case ISCSI_TM_FUNC_TASK_REASSIGN:
1899 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1900 /*
1901 * Perform sanity checks on the ExpDataSN only if the
1902 * TASK_REASSIGN was successful.
1903 */
1904 if (se_tmr->response)
1905 break;
1906
1907 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1908 return iscsit_add_reject_cmd(cmd,
1909 ISCSI_REASON_BOOKMARK_INVALID, buf);
1910 break;
1911 default:
1912 pr_err("Unknown TMR function: 0x%02x, protocol"
1913 " error.\n", function);
1914 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1915 goto attach;
1916 }
1917
1918 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1919 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1920 se_tmr->call_transport = 1;
1921 attach:
1922 spin_lock_bh(&conn->cmd_lock);
1923 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1924 spin_unlock_bh(&conn->cmd_lock);
1925
1926 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1927 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1928 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1929 out_of_order_cmdsn = 1;
1930 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1931 return 0;
1932 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1933 return -1;
1934 }
1935 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1936
1937 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1938 return 0;
1939 /*
1940 * Found the referenced task, send to transport for processing.
1941 */
1942 if (se_tmr->call_transport)
1943 return transport_generic_handle_tmr(&cmd->se_cmd);
1944
1945 /*
1946 * Could not find the referenced LUN, task, or Task Management
1947 * command not authorized or supported. Change state and
1948 * let the tx_thread send the response.
1949 *
1950 * For connection recovery, this is also the default action for
1951 * TMR TASK_REASSIGN.
1952 */
1953 if (sess_ref) {
1954 pr_debug("Handle TMR, using sess_ref=true check\n");
1955 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1956 }
1957
1958 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1959 return 0;
1960 }
1961 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1962
1963 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1964 int
1965 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1966 struct iscsi_text *hdr)
1967 {
1968 u32 payload_length = ntoh24(hdr->dlength);
1969
1970 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1971 pr_err("Unable to accept text parameter length: %u"
1972 "greater than MaxXmitDataSegmentLength %u.\n",
1973 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1974 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1975 (unsigned char *)hdr);
1976 }
1977
1978 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1979 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1980 pr_err("Multi sequence text commands currently not supported\n");
1981 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1982 (unsigned char *)hdr);
1983 }
1984
1985 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1986 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1987 hdr->exp_statsn, payload_length);
1988
1989 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1990 cmd->i_state = ISTATE_SEND_TEXTRSP;
1991 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1992 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1993 cmd->targ_xfer_tag = 0xFFFFFFFF;
1994 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1995 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1996 cmd->data_direction = DMA_NONE;
1997
1998 return 0;
1999 }
2000 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2001
2002 int
2003 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2004 struct iscsi_text *hdr)
2005 {
2006 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2007 int cmdsn_ret;
2008
2009 if (!text_in) {
2010 pr_err("Unable to locate text_in buffer for sendtargets"
2011 " discovery\n");
2012 goto reject;
2013 }
2014 if (strncmp("SendTargets", text_in, 11) != 0) {
2015 pr_err("Received Text Data that is not"
2016 " SendTargets, cannot continue.\n");
2017 goto reject;
2018 }
2019 text_ptr = strchr(text_in, '=');
2020 if (!text_ptr) {
2021 pr_err("No \"=\" separator found in Text Data,"
2022 " cannot continue.\n");
2023 goto reject;
2024 }
2025 if (!strncmp("=All", text_ptr, 4)) {
2026 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
2027 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2028 !strncmp("=eui.", text_ptr, 5)) {
2029 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
2030 } else {
2031 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2032 goto reject;
2033 }
2034
2035 spin_lock_bh(&conn->cmd_lock);
2036 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2037 spin_unlock_bh(&conn->cmd_lock);
2038
2039 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2040
2041 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2042 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2043 (unsigned char *)hdr, hdr->cmdsn);
2044 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2045 return -1;
2046
2047 return 0;
2048 }
2049
2050 return iscsit_execute_cmd(cmd, 0);
2051
2052 reject:
2053 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2054 (unsigned char *)hdr);
2055 }
2056 EXPORT_SYMBOL(iscsit_process_text_cmd);
2057
2058 static int
2059 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2060 unsigned char *buf)
2061 {
2062 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2063 char *text_in = NULL;
2064 u32 payload_length = ntoh24(hdr->dlength);
2065 int rx_size, rc;
2066
2067 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2068 if (rc < 0)
2069 return 0;
2070
2071 rx_size = payload_length;
2072 if (payload_length) {
2073 u32 checksum = 0, data_crc = 0;
2074 u32 padding = 0, pad_bytes = 0;
2075 int niov = 0, rx_got;
2076 struct kvec iov[3];
2077
2078 text_in = kzalloc(payload_length, GFP_KERNEL);
2079 if (!text_in) {
2080 pr_err("Unable to allocate memory for"
2081 " incoming text parameters\n");
2082 goto reject;
2083 }
2084 cmd->text_in_ptr = text_in;
2085
2086 memset(iov, 0, 3 * sizeof(struct kvec));
2087 iov[niov].iov_base = text_in;
2088 iov[niov++].iov_len = payload_length;
2089
2090 padding = ((-payload_length) & 3);
2091 if (padding != 0) {
2092 iov[niov].iov_base = &pad_bytes;
2093 iov[niov++].iov_len = padding;
2094 rx_size += padding;
2095 pr_debug("Receiving %u additional bytes"
2096 " for padding.\n", padding);
2097 }
2098 if (conn->conn_ops->DataDigest) {
2099 iov[niov].iov_base = &checksum;
2100 iov[niov++].iov_len = ISCSI_CRC_LEN;
2101 rx_size += ISCSI_CRC_LEN;
2102 }
2103
2104 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2105 if (rx_got != rx_size)
2106 goto reject;
2107
2108 if (conn->conn_ops->DataDigest) {
2109 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2110 text_in, payload_length,
2111 padding, (u8 *)&pad_bytes,
2112 (u8 *)&data_crc);
2113
2114 if (checksum != data_crc) {
2115 pr_err("Text data CRC32C DataDigest"
2116 " 0x%08x does not match computed"
2117 " 0x%08x\n", checksum, data_crc);
2118 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2119 pr_err("Unable to recover from"
2120 " Text Data digest failure while in"
2121 " ERL=0.\n");
2122 goto reject;
2123 } else {
2124 /*
2125 * Silently drop this PDU and let the
2126 * initiator plug the CmdSN gap.
2127 */
2128 pr_debug("Dropping Text"
2129 " Command CmdSN: 0x%08x due to"
2130 " DataCRC error.\n", hdr->cmdsn);
2131 kfree(text_in);
2132 return 0;
2133 }
2134 } else {
2135 pr_debug("Got CRC32C DataDigest"
2136 " 0x%08x for %u bytes of text data.\n",
2137 checksum, payload_length);
2138 }
2139 }
2140 text_in[payload_length - 1] = '\0';
2141 pr_debug("Successfully read %d bytes of text"
2142 " data.\n", payload_length);
2143 }
2144
2145 return iscsit_process_text_cmd(conn, cmd, hdr);
2146
2147 reject:
2148 kfree(cmd->text_in_ptr);
2149 cmd->text_in_ptr = NULL;
2150 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2151 }
2152 EXPORT_SYMBOL(iscsit_handle_text_cmd);
2153
2154 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2155 {
2156 struct iscsi_conn *conn_p;
2157 struct iscsi_session *sess = conn->sess;
2158
2159 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2160 " for SID: %u.\n", conn->cid, conn->sess->sid);
2161
2162 atomic_set(&sess->session_logout, 1);
2163 atomic_set(&conn->conn_logout_remove, 1);
2164 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2165
2166 iscsit_inc_conn_usage_count(conn);
2167 iscsit_inc_session_usage_count(sess);
2168
2169 spin_lock_bh(&sess->conn_lock);
2170 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2171 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2172 continue;
2173
2174 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2175 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2176 }
2177 spin_unlock_bh(&sess->conn_lock);
2178
2179 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2180
2181 return 0;
2182 }
2183
2184 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2185 {
2186 struct iscsi_conn *l_conn;
2187 struct iscsi_session *sess = conn->sess;
2188
2189 pr_debug("Received logout request CLOSECONNECTION for CID:"
2190 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2191
2192 /*
2193 * A Logout Request with a CLOSECONNECTION reason code for a CID
2194 * can arrive on a connection with a differing CID.
2195 */
2196 if (conn->cid == cmd->logout_cid) {
2197 spin_lock_bh(&conn->state_lock);
2198 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2199 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2200
2201 atomic_set(&conn->conn_logout_remove, 1);
2202 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2203 iscsit_inc_conn_usage_count(conn);
2204
2205 spin_unlock_bh(&conn->state_lock);
2206 } else {
2207 /*
2208 * Handle all different cid CLOSECONNECTION requests in
2209 * iscsit_logout_post_handler_diffcid() as to give enough
2210 * time for any non immediate command's CmdSN to be
2211 * acknowledged on the connection in question.
2212 *
2213 * Here we simply make sure the CID is still around.
2214 */
2215 l_conn = iscsit_get_conn_from_cid(sess,
2216 cmd->logout_cid);
2217 if (!l_conn) {
2218 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2219 iscsit_add_cmd_to_response_queue(cmd, conn,
2220 cmd->i_state);
2221 return 0;
2222 }
2223
2224 iscsit_dec_conn_usage_count(l_conn);
2225 }
2226
2227 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2228
2229 return 0;
2230 }
2231
2232 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2233 {
2234 struct iscsi_session *sess = conn->sess;
2235
2236 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2237 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2238
2239 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2240 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2241 " while ERL!=2.\n");
2242 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2243 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2244 return 0;
2245 }
2246
2247 if (conn->cid == cmd->logout_cid) {
2248 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2249 " with CID: %hu on CID: %hu, implementation error.\n",
2250 cmd->logout_cid, conn->cid);
2251 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2252 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2253 return 0;
2254 }
2255
2256 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2257
2258 return 0;
2259 }
2260
2261 int
2262 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2263 unsigned char *buf)
2264 {
2265 int cmdsn_ret, logout_remove = 0;
2266 u8 reason_code = 0;
2267 struct iscsi_logout *hdr;
2268 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2269
2270 hdr = (struct iscsi_logout *) buf;
2271 reason_code = (hdr->flags & 0x7f);
2272
2273 if (tiqn) {
2274 spin_lock(&tiqn->logout_stats.lock);
2275 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2276 tiqn->logout_stats.normal_logouts++;
2277 else
2278 tiqn->logout_stats.abnormal_logouts++;
2279 spin_unlock(&tiqn->logout_stats.lock);
2280 }
2281
2282 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2283 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2284 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2285 hdr->cid, conn->cid);
2286
2287 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2288 pr_err("Received logout request on connection that"
2289 " is not in logged in state, ignoring request.\n");
2290 iscsit_free_cmd(cmd, false);
2291 return 0;
2292 }
2293
2294 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2295 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2296 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2297 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2298 cmd->targ_xfer_tag = 0xFFFFFFFF;
2299 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2300 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2301 cmd->logout_cid = be16_to_cpu(hdr->cid);
2302 cmd->logout_reason = reason_code;
2303 cmd->data_direction = DMA_NONE;
2304
2305 /*
2306 * We need to sleep in these cases (by returning 1) until the Logout
2307 * Response gets sent in the tx thread.
2308 */
2309 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2310 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2311 be16_to_cpu(hdr->cid) == conn->cid))
2312 logout_remove = 1;
2313
2314 spin_lock_bh(&conn->cmd_lock);
2315 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2316 spin_unlock_bh(&conn->cmd_lock);
2317
2318 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2319 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2320
2321 /*
2322 * Immediate commands are executed, well, immediately.
2323 * Non-Immediate Logout Commands are executed in CmdSN order.
2324 */
2325 if (cmd->immediate_cmd) {
2326 int ret = iscsit_execute_cmd(cmd, 0);
2327
2328 if (ret < 0)
2329 return ret;
2330 } else {
2331 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2332 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2333 logout_remove = 0;
2334 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2335 return -1;
2336 }
2337
2338 return logout_remove;
2339 }
2340 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2341
2342 static int iscsit_handle_snack(
2343 struct iscsi_conn *conn,
2344 unsigned char *buf)
2345 {
2346 struct iscsi_snack *hdr;
2347
2348 hdr = (struct iscsi_snack *) buf;
2349 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2350
2351 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2352 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2353 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2354 hdr->begrun, hdr->runlength, conn->cid);
2355
2356 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2357 pr_err("Initiator sent SNACK request while in"
2358 " ErrorRecoveryLevel=0.\n");
2359 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2360 buf);
2361 }
2362 /*
2363 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2364 * call from inside iscsi_send_recovery_datain_or_r2t().
2365 */
2366 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2367 case 0:
2368 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2369 hdr->itt,
2370 be32_to_cpu(hdr->ttt),
2371 be32_to_cpu(hdr->begrun),
2372 be32_to_cpu(hdr->runlength));
2373 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2374 return iscsit_handle_status_snack(conn, hdr->itt,
2375 be32_to_cpu(hdr->ttt),
2376 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2377 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2378 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2379 be32_to_cpu(hdr->begrun),
2380 be32_to_cpu(hdr->runlength));
2381 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2382 /* FIXME: Support R-Data SNACK */
2383 pr_err("R-Data SNACK Not Supported.\n");
2384 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2385 buf);
2386 default:
2387 pr_err("Unknown SNACK type 0x%02x, protocol"
2388 " error.\n", hdr->flags & 0x0f);
2389 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2390 buf);
2391 }
2392
2393 return 0;
2394 }
2395
2396 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2397 {
2398 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2399 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2400 wait_for_completion_interruptible_timeout(
2401 &conn->rx_half_close_comp,
2402 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2403 }
2404 }
2405
2406 static int iscsit_handle_immediate_data(
2407 struct iscsi_cmd *cmd,
2408 struct iscsi_scsi_req *hdr,
2409 u32 length)
2410 {
2411 int iov_ret, rx_got = 0, rx_size = 0;
2412 u32 checksum, iov_count = 0, padding = 0;
2413 struct iscsi_conn *conn = cmd->conn;
2414 struct kvec *iov;
2415
2416 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2417 if (iov_ret < 0)
2418 return IMMEDIATE_DATA_CANNOT_RECOVER;
2419
2420 rx_size = length;
2421 iov_count = iov_ret;
2422 iov = &cmd->iov_data[0];
2423
2424 padding = ((-length) & 3);
2425 if (padding != 0) {
2426 iov[iov_count].iov_base = cmd->pad_bytes;
2427 iov[iov_count++].iov_len = padding;
2428 rx_size += padding;
2429 }
2430
2431 if (conn->conn_ops->DataDigest) {
2432 iov[iov_count].iov_base = &checksum;
2433 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2434 rx_size += ISCSI_CRC_LEN;
2435 }
2436
2437 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2438
2439 iscsit_unmap_iovec(cmd);
2440
2441 if (rx_got != rx_size) {
2442 iscsit_rx_thread_wait_for_tcp(conn);
2443 return IMMEDIATE_DATA_CANNOT_RECOVER;
2444 }
2445
2446 if (conn->conn_ops->DataDigest) {
2447 u32 data_crc;
2448
2449 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2450 cmd->write_data_done, length, padding,
2451 cmd->pad_bytes);
2452
2453 if (checksum != data_crc) {
2454 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2455 " does not match computed 0x%08x\n", checksum,
2456 data_crc);
2457
2458 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2459 pr_err("Unable to recover from"
2460 " Immediate Data digest failure while"
2461 " in ERL=0.\n");
2462 iscsit_reject_cmd(cmd,
2463 ISCSI_REASON_DATA_DIGEST_ERROR,
2464 (unsigned char *)hdr);
2465 return IMMEDIATE_DATA_CANNOT_RECOVER;
2466 } else {
2467 iscsit_reject_cmd(cmd,
2468 ISCSI_REASON_DATA_DIGEST_ERROR,
2469 (unsigned char *)hdr);
2470 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2471 }
2472 } else {
2473 pr_debug("Got CRC32C DataDigest 0x%08x for"
2474 " %u bytes of Immediate Data\n", checksum,
2475 length);
2476 }
2477 }
2478
2479 cmd->write_data_done += length;
2480
2481 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2482 spin_lock_bh(&cmd->istate_lock);
2483 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2484 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2485 spin_unlock_bh(&cmd->istate_lock);
2486 }
2487
2488 return IMMEDIATE_DATA_NORMAL_OPERATION;
2489 }
2490
2491 /*
2492 * Called with sess->conn_lock held.
2493 */
2494 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2495 with active network interface */
2496 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2497 {
2498 struct iscsi_cmd *cmd;
2499 struct iscsi_conn *conn_p;
2500 bool found = false;
2501
2502 /*
2503 * Only send a Asynchronous Message on connections whos network
2504 * interface is still functional.
2505 */
2506 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2507 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2508 iscsit_inc_conn_usage_count(conn_p);
2509 found = true;
2510 break;
2511 }
2512 }
2513
2514 if (!found)
2515 return;
2516
2517 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2518 if (!cmd) {
2519 iscsit_dec_conn_usage_count(conn_p);
2520 return;
2521 }
2522
2523 cmd->logout_cid = conn->cid;
2524 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2525 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2526
2527 spin_lock_bh(&conn_p->cmd_lock);
2528 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2529 spin_unlock_bh(&conn_p->cmd_lock);
2530
2531 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2532 iscsit_dec_conn_usage_count(conn_p);
2533 }
2534
2535 static int iscsit_send_conn_drop_async_message(
2536 struct iscsi_cmd *cmd,
2537 struct iscsi_conn *conn)
2538 {
2539 struct iscsi_async *hdr;
2540
2541 cmd->tx_size = ISCSI_HDR_LEN;
2542 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2543
2544 hdr = (struct iscsi_async *) cmd->pdu;
2545 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2546 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2547 cmd->init_task_tag = RESERVED_ITT;
2548 cmd->targ_xfer_tag = 0xFFFFFFFF;
2549 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2550 cmd->stat_sn = conn->stat_sn++;
2551 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2552 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2553 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2554 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2555 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2556 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2557 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2558
2559 if (conn->conn_ops->HeaderDigest) {
2560 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2561
2562 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2563 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2564
2565 cmd->tx_size += ISCSI_CRC_LEN;
2566 pr_debug("Attaching CRC32C HeaderDigest to"
2567 " Async Message 0x%08x\n", *header_digest);
2568 }
2569
2570 cmd->iov_misc[0].iov_base = cmd->pdu;
2571 cmd->iov_misc[0].iov_len = cmd->tx_size;
2572 cmd->iov_misc_count = 1;
2573
2574 pr_debug("Sending Connection Dropped Async Message StatSN:"
2575 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2576 cmd->logout_cid, conn->cid);
2577 return 0;
2578 }
2579
2580 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2581 {
2582 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2583 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2584 wait_for_completion_interruptible_timeout(
2585 &conn->tx_half_close_comp,
2586 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2587 }
2588 }
2589
2590 static void
2591 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2592 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2593 bool set_statsn)
2594 {
2595 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2596 hdr->flags = datain->flags;
2597 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2598 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2599 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2600 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2601 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2602 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2603 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2604 }
2605 }
2606 hton24(hdr->dlength, datain->length);
2607 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2608 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2609 (struct scsi_lun *)&hdr->lun);
2610 else
2611 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2612
2613 hdr->itt = cmd->init_task_tag;
2614
2615 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2616 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2617 else
2618 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2619 if (set_statsn)
2620 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2621 else
2622 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2623
2624 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2625 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2626 hdr->datasn = cpu_to_be32(datain->data_sn);
2627 hdr->offset = cpu_to_be32(datain->offset);
2628
2629 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2630 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2631 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2632 ntohl(hdr->offset), datain->length, conn->cid);
2633 }
2634
2635 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2636 {
2637 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2638 struct iscsi_datain datain;
2639 struct iscsi_datain_req *dr;
2640 struct kvec *iov;
2641 u32 iov_count = 0, tx_size = 0;
2642 int eodr = 0, ret, iov_ret;
2643 bool set_statsn = false;
2644
2645 memset(&datain, 0, sizeof(struct iscsi_datain));
2646 dr = iscsit_get_datain_values(cmd, &datain);
2647 if (!dr) {
2648 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2649 cmd->init_task_tag);
2650 return -1;
2651 }
2652 /*
2653 * Be paranoid and double check the logic for now.
2654 */
2655 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2656 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2657 " datain.length: %u exceeds cmd->data_length: %u\n",
2658 cmd->init_task_tag, datain.offset, datain.length,
2659 cmd->se_cmd.data_length);
2660 return -1;
2661 }
2662
2663 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2664 /*
2665 * Special case for successfully execution w/ both DATAIN
2666 * and Sense Data.
2667 */
2668 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2669 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2670 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2671 else {
2672 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2673 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2674 iscsit_increment_maxcmdsn(cmd, conn->sess);
2675 cmd->stat_sn = conn->stat_sn++;
2676 set_statsn = true;
2677 } else if (dr->dr_complete ==
2678 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2679 set_statsn = true;
2680 }
2681
2682 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2683
2684 iov = &cmd->iov_data[0];
2685 iov[iov_count].iov_base = cmd->pdu;
2686 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2687 tx_size += ISCSI_HDR_LEN;
2688
2689 if (conn->conn_ops->HeaderDigest) {
2690 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2691
2692 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2693 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2694
2695 iov[0].iov_len += ISCSI_CRC_LEN;
2696 tx_size += ISCSI_CRC_LEN;
2697
2698 pr_debug("Attaching CRC32 HeaderDigest"
2699 " for DataIN PDU 0x%08x\n", *header_digest);
2700 }
2701
2702 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2703 datain.offset, datain.length);
2704 if (iov_ret < 0)
2705 return -1;
2706
2707 iov_count += iov_ret;
2708 tx_size += datain.length;
2709
2710 cmd->padding = ((-datain.length) & 3);
2711 if (cmd->padding) {
2712 iov[iov_count].iov_base = cmd->pad_bytes;
2713 iov[iov_count++].iov_len = cmd->padding;
2714 tx_size += cmd->padding;
2715
2716 pr_debug("Attaching %u padding bytes\n",
2717 cmd->padding);
2718 }
2719 if (conn->conn_ops->DataDigest) {
2720 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2721 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2722
2723 iov[iov_count].iov_base = &cmd->data_crc;
2724 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2725 tx_size += ISCSI_CRC_LEN;
2726
2727 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2728 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2729 }
2730
2731 cmd->iov_data_count = iov_count;
2732 cmd->tx_size = tx_size;
2733
2734 /* sendpage is preferred but can't insert markers */
2735 if (!conn->conn_ops->IFMarker)
2736 ret = iscsit_fe_sendpage_sg(cmd, conn);
2737 else
2738 ret = iscsit_send_tx_data(cmd, conn, 0);
2739
2740 iscsit_unmap_iovec(cmd);
2741
2742 if (ret < 0) {
2743 iscsit_tx_thread_wait_for_tcp(conn);
2744 return ret;
2745 }
2746
2747 if (dr->dr_complete) {
2748 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2749 2 : 1;
2750 iscsit_free_datain_req(cmd, dr);
2751 }
2752
2753 return eodr;
2754 }
2755
2756 int
2757 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2758 struct iscsi_logout_rsp *hdr)
2759 {
2760 struct iscsi_conn *logout_conn = NULL;
2761 struct iscsi_conn_recovery *cr = NULL;
2762 struct iscsi_session *sess = conn->sess;
2763 /*
2764 * The actual shutting down of Sessions and/or Connections
2765 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2766 * is done in scsi_logout_post_handler().
2767 */
2768 switch (cmd->logout_reason) {
2769 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2770 pr_debug("iSCSI session logout successful, setting"
2771 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2772 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2773 break;
2774 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2775 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2776 break;
2777 /*
2778 * For CLOSECONNECTION logout requests carrying
2779 * a matching logout CID -> local CID, the reference
2780 * for the local CID will have been incremented in
2781 * iscsi_logout_closeconnection().
2782 *
2783 * For CLOSECONNECTION logout requests carrying
2784 * a different CID than the connection it arrived
2785 * on, the connection responding to cmd->logout_cid
2786 * is stopped in iscsit_logout_post_handler_diffcid().
2787 */
2788
2789 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2790 " successful.\n", cmd->logout_cid, conn->cid);
2791 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2792 break;
2793 case ISCSI_LOGOUT_REASON_RECOVERY:
2794 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2795 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2796 break;
2797 /*
2798 * If the connection is still active from our point of view
2799 * force connection recovery to occur.
2800 */
2801 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2802 cmd->logout_cid);
2803 if (logout_conn) {
2804 iscsit_connection_reinstatement_rcfr(logout_conn);
2805 iscsit_dec_conn_usage_count(logout_conn);
2806 }
2807
2808 cr = iscsit_get_inactive_connection_recovery_entry(
2809 conn->sess, cmd->logout_cid);
2810 if (!cr) {
2811 pr_err("Unable to locate CID: %hu for"
2812 " REMOVECONNFORRECOVERY Logout Request.\n",
2813 cmd->logout_cid);
2814 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2815 break;
2816 }
2817
2818 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2819
2820 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2821 " for recovery for CID: %hu on CID: %hu successful.\n",
2822 cmd->logout_cid, conn->cid);
2823 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2824 break;
2825 default:
2826 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2827 cmd->logout_reason);
2828 return -1;
2829 }
2830
2831 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2832 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2833 hdr->response = cmd->logout_response;
2834 hdr->itt = cmd->init_task_tag;
2835 cmd->stat_sn = conn->stat_sn++;
2836 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2837
2838 iscsit_increment_maxcmdsn(cmd, conn->sess);
2839 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2840 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2841
2842 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2843 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2844 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2845 cmd->logout_cid, conn->cid);
2846
2847 return 0;
2848 }
2849 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2850
2851 static int
2852 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2853 {
2854 struct kvec *iov;
2855 int niov = 0, tx_size, rc;
2856
2857 rc = iscsit_build_logout_rsp(cmd, conn,
2858 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2859 if (rc < 0)
2860 return rc;
2861
2862 tx_size = ISCSI_HDR_LEN;
2863 iov = &cmd->iov_misc[0];
2864 iov[niov].iov_base = cmd->pdu;
2865 iov[niov++].iov_len = ISCSI_HDR_LEN;
2866
2867 if (conn->conn_ops->HeaderDigest) {
2868 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2869
2870 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2871 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2872
2873 iov[0].iov_len += ISCSI_CRC_LEN;
2874 tx_size += ISCSI_CRC_LEN;
2875 pr_debug("Attaching CRC32C HeaderDigest to"
2876 " Logout Response 0x%08x\n", *header_digest);
2877 }
2878 cmd->iov_misc_count = niov;
2879 cmd->tx_size = tx_size;
2880
2881 return 0;
2882 }
2883
2884 void
2885 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2886 struct iscsi_nopin *hdr, bool nopout_response)
2887 {
2888 hdr->opcode = ISCSI_OP_NOOP_IN;
2889 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2890 hton24(hdr->dlength, cmd->buf_ptr_size);
2891 if (nopout_response)
2892 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2893 hdr->itt = cmd->init_task_tag;
2894 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2895 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2896 conn->stat_sn;
2897 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2898
2899 if (nopout_response)
2900 iscsit_increment_maxcmdsn(cmd, conn->sess);
2901
2902 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2903 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2904
2905 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2906 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2907 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2908 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2909 }
2910 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2911
2912 /*
2913 * Unsolicited NOPIN, either requesting a response or not.
2914 */
2915 static int iscsit_send_unsolicited_nopin(
2916 struct iscsi_cmd *cmd,
2917 struct iscsi_conn *conn,
2918 int want_response)
2919 {
2920 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2921 int tx_size = ISCSI_HDR_LEN, ret;
2922
2923 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2924
2925 if (conn->conn_ops->HeaderDigest) {
2926 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2927
2928 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2929 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2930
2931 tx_size += ISCSI_CRC_LEN;
2932 pr_debug("Attaching CRC32C HeaderDigest to"
2933 " NopIN 0x%08x\n", *header_digest);
2934 }
2935
2936 cmd->iov_misc[0].iov_base = cmd->pdu;
2937 cmd->iov_misc[0].iov_len = tx_size;
2938 cmd->iov_misc_count = 1;
2939 cmd->tx_size = tx_size;
2940
2941 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2942 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2943
2944 ret = iscsit_send_tx_data(cmd, conn, 1);
2945 if (ret < 0) {
2946 iscsit_tx_thread_wait_for_tcp(conn);
2947 return ret;
2948 }
2949
2950 spin_lock_bh(&cmd->istate_lock);
2951 cmd->i_state = want_response ?
2952 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2953 spin_unlock_bh(&cmd->istate_lock);
2954
2955 return 0;
2956 }
2957
2958 static int
2959 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2960 {
2961 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2962 struct kvec *iov;
2963 u32 padding = 0;
2964 int niov = 0, tx_size;
2965
2966 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2967
2968 tx_size = ISCSI_HDR_LEN;
2969 iov = &cmd->iov_misc[0];
2970 iov[niov].iov_base = cmd->pdu;
2971 iov[niov++].iov_len = ISCSI_HDR_LEN;
2972
2973 if (conn->conn_ops->HeaderDigest) {
2974 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2975
2976 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2977 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2978
2979 iov[0].iov_len += ISCSI_CRC_LEN;
2980 tx_size += ISCSI_CRC_LEN;
2981 pr_debug("Attaching CRC32C HeaderDigest"
2982 " to NopIn 0x%08x\n", *header_digest);
2983 }
2984
2985 /*
2986 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2987 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2988 */
2989 if (cmd->buf_ptr_size) {
2990 iov[niov].iov_base = cmd->buf_ptr;
2991 iov[niov++].iov_len = cmd->buf_ptr_size;
2992 tx_size += cmd->buf_ptr_size;
2993
2994 pr_debug("Echoing back %u bytes of ping"
2995 " data.\n", cmd->buf_ptr_size);
2996
2997 padding = ((-cmd->buf_ptr_size) & 3);
2998 if (padding != 0) {
2999 iov[niov].iov_base = &cmd->pad_bytes;
3000 iov[niov++].iov_len = padding;
3001 tx_size += padding;
3002 pr_debug("Attaching %u additional"
3003 " padding bytes.\n", padding);
3004 }
3005 if (conn->conn_ops->DataDigest) {
3006 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3007 cmd->buf_ptr, cmd->buf_ptr_size,
3008 padding, (u8 *)&cmd->pad_bytes,
3009 (u8 *)&cmd->data_crc);
3010
3011 iov[niov].iov_base = &cmd->data_crc;
3012 iov[niov++].iov_len = ISCSI_CRC_LEN;
3013 tx_size += ISCSI_CRC_LEN;
3014 pr_debug("Attached DataDigest for %u"
3015 " bytes of ping data, CRC 0x%08x\n",
3016 cmd->buf_ptr_size, cmd->data_crc);
3017 }
3018 }
3019
3020 cmd->iov_misc_count = niov;
3021 cmd->tx_size = tx_size;
3022
3023 return 0;
3024 }
3025
3026 static int iscsit_send_r2t(
3027 struct iscsi_cmd *cmd,
3028 struct iscsi_conn *conn)
3029 {
3030 int tx_size = 0;
3031 struct iscsi_r2t *r2t;
3032 struct iscsi_r2t_rsp *hdr;
3033 int ret;
3034
3035 r2t = iscsit_get_r2t_from_list(cmd);
3036 if (!r2t)
3037 return -1;
3038
3039 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3040 memset(hdr, 0, ISCSI_HDR_LEN);
3041 hdr->opcode = ISCSI_OP_R2T;
3042 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3043 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3044 (struct scsi_lun *)&hdr->lun);
3045 hdr->itt = cmd->init_task_tag;
3046 spin_lock_bh(&conn->sess->ttt_lock);
3047 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3048 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3049 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3050 spin_unlock_bh(&conn->sess->ttt_lock);
3051 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3052 hdr->statsn = cpu_to_be32(conn->stat_sn);
3053 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3054 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3055 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3056 hdr->data_offset = cpu_to_be32(r2t->offset);
3057 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3058
3059 cmd->iov_misc[0].iov_base = cmd->pdu;
3060 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3061 tx_size += ISCSI_HDR_LEN;
3062
3063 if (conn->conn_ops->HeaderDigest) {
3064 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3065
3066 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3067 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3068
3069 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3070 tx_size += ISCSI_CRC_LEN;
3071 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3072 " PDU 0x%08x\n", *header_digest);
3073 }
3074
3075 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3076 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3077 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3078 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3079 r2t->offset, r2t->xfer_len, conn->cid);
3080
3081 cmd->iov_misc_count = 1;
3082 cmd->tx_size = tx_size;
3083
3084 spin_lock_bh(&cmd->r2t_lock);
3085 r2t->sent_r2t = 1;
3086 spin_unlock_bh(&cmd->r2t_lock);
3087
3088 ret = iscsit_send_tx_data(cmd, conn, 1);
3089 if (ret < 0) {
3090 iscsit_tx_thread_wait_for_tcp(conn);
3091 return ret;
3092 }
3093
3094 spin_lock_bh(&cmd->dataout_timeout_lock);
3095 iscsit_start_dataout_timer(cmd, conn);
3096 spin_unlock_bh(&cmd->dataout_timeout_lock);
3097
3098 return 0;
3099 }
3100
3101 /*
3102 * @recovery: If called from iscsi_task_reassign_complete_write() for
3103 * connection recovery.
3104 */
3105 int iscsit_build_r2ts_for_cmd(
3106 struct iscsi_conn *conn,
3107 struct iscsi_cmd *cmd,
3108 bool recovery)
3109 {
3110 int first_r2t = 1;
3111 u32 offset = 0, xfer_len = 0;
3112
3113 spin_lock_bh(&cmd->r2t_lock);
3114 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3115 spin_unlock_bh(&cmd->r2t_lock);
3116 return 0;
3117 }
3118
3119 if (conn->sess->sess_ops->DataSequenceInOrder &&
3120 !recovery)
3121 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3122
3123 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3124 if (conn->sess->sess_ops->DataSequenceInOrder) {
3125 offset = cmd->r2t_offset;
3126
3127 if (first_r2t && recovery) {
3128 int new_data_end = offset +
3129 conn->sess->sess_ops->MaxBurstLength -
3130 cmd->next_burst_len;
3131
3132 if (new_data_end > cmd->se_cmd.data_length)
3133 xfer_len = cmd->se_cmd.data_length - offset;
3134 else
3135 xfer_len =
3136 conn->sess->sess_ops->MaxBurstLength -
3137 cmd->next_burst_len;
3138 } else {
3139 int new_data_end = offset +
3140 conn->sess->sess_ops->MaxBurstLength;
3141
3142 if (new_data_end > cmd->se_cmd.data_length)
3143 xfer_len = cmd->se_cmd.data_length - offset;
3144 else
3145 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3146 }
3147 cmd->r2t_offset += xfer_len;
3148
3149 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3150 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3151 } else {
3152 struct iscsi_seq *seq;
3153
3154 seq = iscsit_get_seq_holder_for_r2t(cmd);
3155 if (!seq) {
3156 spin_unlock_bh(&cmd->r2t_lock);
3157 return -1;
3158 }
3159
3160 offset = seq->offset;
3161 xfer_len = seq->xfer_len;
3162
3163 if (cmd->seq_send_order == cmd->seq_count)
3164 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3165 }
3166 cmd->outstanding_r2ts++;
3167 first_r2t = 0;
3168
3169 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3170 spin_unlock_bh(&cmd->r2t_lock);
3171 return -1;
3172 }
3173
3174 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3175 break;
3176 }
3177 spin_unlock_bh(&cmd->r2t_lock);
3178
3179 return 0;
3180 }
3181
3182 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3183 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3184 {
3185 if (inc_stat_sn)
3186 cmd->stat_sn = conn->stat_sn++;
3187
3188 atomic_long_inc(&conn->sess->rsp_pdus);
3189
3190 memset(hdr, 0, ISCSI_HDR_LEN);
3191 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3192 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3193 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3194 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3195 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3196 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3197 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3198 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3199 }
3200 hdr->response = cmd->iscsi_response;
3201 hdr->cmd_status = cmd->se_cmd.scsi_status;
3202 hdr->itt = cmd->init_task_tag;
3203 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3204
3205 iscsit_increment_maxcmdsn(cmd, conn->sess);
3206 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3207 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3208
3209 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3210 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3211 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3212 cmd->se_cmd.scsi_status, conn->cid);
3213 }
3214 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3215
3216 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3217 {
3218 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3219 struct kvec *iov;
3220 u32 padding = 0, tx_size = 0;
3221 int iov_count = 0;
3222 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3223
3224 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3225
3226 iov = &cmd->iov_misc[0];
3227 iov[iov_count].iov_base = cmd->pdu;
3228 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3229 tx_size += ISCSI_HDR_LEN;
3230
3231 /*
3232 * Attach SENSE DATA payload to iSCSI Response PDU
3233 */
3234 if (cmd->se_cmd.sense_buffer &&
3235 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3236 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3237 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3238 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3239
3240 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3241 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3242 iov[iov_count].iov_base = cmd->sense_buffer;
3243 iov[iov_count++].iov_len =
3244 (cmd->se_cmd.scsi_sense_length + padding);
3245 tx_size += cmd->se_cmd.scsi_sense_length;
3246
3247 if (padding) {
3248 memset(cmd->sense_buffer +
3249 cmd->se_cmd.scsi_sense_length, 0, padding);
3250 tx_size += padding;
3251 pr_debug("Adding %u bytes of padding to"
3252 " SENSE.\n", padding);
3253 }
3254
3255 if (conn->conn_ops->DataDigest) {
3256 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3257 cmd->sense_buffer,
3258 (cmd->se_cmd.scsi_sense_length + padding),
3259 0, NULL, (u8 *)&cmd->data_crc);
3260
3261 iov[iov_count].iov_base = &cmd->data_crc;
3262 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3263 tx_size += ISCSI_CRC_LEN;
3264
3265 pr_debug("Attaching CRC32 DataDigest for"
3266 " SENSE, %u bytes CRC 0x%08x\n",
3267 (cmd->se_cmd.scsi_sense_length + padding),
3268 cmd->data_crc);
3269 }
3270
3271 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3272 " Response PDU\n",
3273 cmd->se_cmd.scsi_sense_length);
3274 }
3275
3276 if (conn->conn_ops->HeaderDigest) {
3277 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3278
3279 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3280 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3281
3282 iov[0].iov_len += ISCSI_CRC_LEN;
3283 tx_size += ISCSI_CRC_LEN;
3284 pr_debug("Attaching CRC32 HeaderDigest for Response"
3285 " PDU 0x%08x\n", *header_digest);
3286 }
3287
3288 cmd->iov_misc_count = iov_count;
3289 cmd->tx_size = tx_size;
3290
3291 return 0;
3292 }
3293
3294 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3295 {
3296 switch (se_tmr->response) {
3297 case TMR_FUNCTION_COMPLETE:
3298 return ISCSI_TMF_RSP_COMPLETE;
3299 case TMR_TASK_DOES_NOT_EXIST:
3300 return ISCSI_TMF_RSP_NO_TASK;
3301 case TMR_LUN_DOES_NOT_EXIST:
3302 return ISCSI_TMF_RSP_NO_LUN;
3303 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3304 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3305 case TMR_FUNCTION_REJECTED:
3306 default:
3307 return ISCSI_TMF_RSP_REJECTED;
3308 }
3309 }
3310
3311 void
3312 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3313 struct iscsi_tm_rsp *hdr)
3314 {
3315 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3316
3317 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3318 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3319 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3320 hdr->itt = cmd->init_task_tag;
3321 cmd->stat_sn = conn->stat_sn++;
3322 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3323
3324 iscsit_increment_maxcmdsn(cmd, conn->sess);
3325 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3326 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3327
3328 pr_debug("Built Task Management Response ITT: 0x%08x,"
3329 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3330 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3331 }
3332 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3333
3334 static int
3335 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3336 {
3337 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3338 u32 tx_size = 0;
3339
3340 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3341
3342 cmd->iov_misc[0].iov_base = cmd->pdu;
3343 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3344 tx_size += ISCSI_HDR_LEN;
3345
3346 if (conn->conn_ops->HeaderDigest) {
3347 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3348
3349 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3350 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3351
3352 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3353 tx_size += ISCSI_CRC_LEN;
3354 pr_debug("Attaching CRC32 HeaderDigest for Task"
3355 " Mgmt Response PDU 0x%08x\n", *header_digest);
3356 }
3357
3358 cmd->iov_misc_count = 1;
3359 cmd->tx_size = tx_size;
3360
3361 return 0;
3362 }
3363
3364 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3365 {
3366 bool ret = false;
3367
3368 if (np->np_sockaddr.ss_family == AF_INET6) {
3369 const struct sockaddr_in6 sin6 = {
3370 .sin6_addr = IN6ADDR_ANY_INIT };
3371 struct sockaddr_in6 *sock_in6 =
3372 (struct sockaddr_in6 *)&np->np_sockaddr;
3373
3374 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3375 sin6.sin6_addr.s6_addr, 16))
3376 ret = true;
3377 } else {
3378 struct sockaddr_in * sock_in =
3379 (struct sockaddr_in *)&np->np_sockaddr;
3380
3381 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3382 ret = true;
3383 }
3384
3385 return ret;
3386 }
3387
3388 #define SENDTARGETS_BUF_LIMIT 32768U
3389
3390 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3391 {
3392 char *payload = NULL;
3393 struct iscsi_conn *conn = cmd->conn;
3394 struct iscsi_portal_group *tpg;
3395 struct iscsi_tiqn *tiqn;
3396 struct iscsi_tpg_np *tpg_np;
3397 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3398 int target_name_printed;
3399 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3400 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3401
3402 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3403 SENDTARGETS_BUF_LIMIT);
3404
3405 payload = kzalloc(buffer_len, GFP_KERNEL);
3406 if (!payload) {
3407 pr_err("Unable to allocate memory for sendtargets"
3408 " response.\n");
3409 return -ENOMEM;
3410 }
3411 /*
3412 * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
3413 * explicit case..
3414 */
3415 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
3416 text_ptr = strchr(text_in, '=');
3417 if (!text_ptr) {
3418 pr_err("Unable to locate '=' string in text_in:"
3419 " %s\n", text_in);
3420 kfree(payload);
3421 return -EINVAL;
3422 }
3423 /*
3424 * Skip over '=' character..
3425 */
3426 text_ptr += 1;
3427 }
3428
3429 spin_lock(&tiqn_lock);
3430 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3431 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
3432 strcmp(tiqn->tiqn, text_ptr)) {
3433 continue;
3434 }
3435
3436 target_name_printed = 0;
3437
3438 spin_lock(&tiqn->tiqn_tpg_lock);
3439 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3440
3441 /* If demo_mode_discovery=0 and generate_node_acls=0
3442 * (demo mode dislabed) do not return
3443 * TargetName+TargetAddress unless a NodeACL exists.
3444 */
3445
3446 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3447 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3448 (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3449 cmd->conn->sess->sess_ops->InitiatorName))) {
3450 continue;
3451 }
3452
3453 spin_lock(&tpg->tpg_state_lock);
3454 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3455 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3456 spin_unlock(&tpg->tpg_state_lock);
3457 continue;
3458 }
3459 spin_unlock(&tpg->tpg_state_lock);
3460
3461 spin_lock(&tpg->tpg_np_lock);
3462 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3463 tpg_np_list) {
3464 struct iscsi_np *np = tpg_np->tpg_np;
3465 bool inaddr_any = iscsit_check_inaddr_any(np);
3466
3467 if (!target_name_printed) {
3468 len = sprintf(buf, "TargetName=%s",
3469 tiqn->tiqn);
3470 len += 1;
3471
3472 if ((len + payload_len) > buffer_len) {
3473 spin_unlock(&tpg->tpg_np_lock);
3474 spin_unlock(&tiqn->tiqn_tpg_lock);
3475 end_of_buf = 1;
3476 goto eob;
3477 }
3478 memcpy(payload + payload_len, buf, len);
3479 payload_len += len;
3480 target_name_printed = 1;
3481 }
3482
3483 len = sprintf(buf, "TargetAddress="
3484 "%s:%hu,%hu",
3485 (inaddr_any == false) ?
3486 np->np_ip : conn->local_ip,
3487 (inaddr_any == false) ?
3488 np->np_port : conn->local_port,
3489 tpg->tpgt);
3490 len += 1;
3491
3492 if ((len + payload_len) > buffer_len) {
3493 spin_unlock(&tpg->tpg_np_lock);
3494 spin_unlock(&tiqn->tiqn_tpg_lock);
3495 end_of_buf = 1;
3496 goto eob;
3497 }
3498 memcpy(payload + payload_len, buf, len);
3499 payload_len += len;
3500 }
3501 spin_unlock(&tpg->tpg_np_lock);
3502 }
3503 spin_unlock(&tiqn->tiqn_tpg_lock);
3504 eob:
3505 if (end_of_buf)
3506 break;
3507
3508 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
3509 break;
3510 }
3511 spin_unlock(&tiqn_lock);
3512
3513 cmd->buf_ptr = payload;
3514
3515 return payload_len;
3516 }
3517
3518 int
3519 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3520 struct iscsi_text_rsp *hdr)
3521 {
3522 int text_length, padding;
3523
3524 text_length = iscsit_build_sendtargets_response(cmd);
3525 if (text_length < 0)
3526 return text_length;
3527
3528 hdr->opcode = ISCSI_OP_TEXT_RSP;
3529 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3530 padding = ((-text_length) & 3);
3531 hton24(hdr->dlength, text_length);
3532 hdr->itt = cmd->init_task_tag;
3533 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3534 cmd->stat_sn = conn->stat_sn++;
3535 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3536
3537 iscsit_increment_maxcmdsn(cmd, conn->sess);
3538 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3539 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3540
3541 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3542 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3543 text_length, conn->cid);
3544
3545 return text_length + padding;
3546 }
3547 EXPORT_SYMBOL(iscsit_build_text_rsp);
3548
3549 /*
3550 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3551 * MaxRecvDataSegmentLength.
3552 */
3553 static int iscsit_send_text_rsp(
3554 struct iscsi_cmd *cmd,
3555 struct iscsi_conn *conn)
3556 {
3557 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3558 struct kvec *iov;
3559 u32 tx_size = 0;
3560 int text_length, iov_count = 0, rc;
3561
3562 rc = iscsit_build_text_rsp(cmd, conn, hdr);
3563 if (rc < 0)
3564 return rc;
3565
3566 text_length = rc;
3567 iov = &cmd->iov_misc[0];
3568 iov[iov_count].iov_base = cmd->pdu;
3569 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3570 iov[iov_count].iov_base = cmd->buf_ptr;
3571 iov[iov_count++].iov_len = text_length;
3572
3573 tx_size += (ISCSI_HDR_LEN + text_length);
3574
3575 if (conn->conn_ops->HeaderDigest) {
3576 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3577
3578 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3579 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3580
3581 iov[0].iov_len += ISCSI_CRC_LEN;
3582 tx_size += ISCSI_CRC_LEN;
3583 pr_debug("Attaching CRC32 HeaderDigest for"
3584 " Text Response PDU 0x%08x\n", *header_digest);
3585 }
3586
3587 if (conn->conn_ops->DataDigest) {
3588 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3589 cmd->buf_ptr, text_length,
3590 0, NULL, (u8 *)&cmd->data_crc);
3591
3592 iov[iov_count].iov_base = &cmd->data_crc;
3593 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3594 tx_size += ISCSI_CRC_LEN;
3595
3596 pr_debug("Attaching DataDigest for %u bytes of text"
3597 " data, CRC 0x%08x\n", text_length,
3598 cmd->data_crc);
3599 }
3600
3601 cmd->iov_misc_count = iov_count;
3602 cmd->tx_size = tx_size;
3603
3604 return 0;
3605 }
3606
3607 void
3608 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3609 struct iscsi_reject *hdr)
3610 {
3611 hdr->opcode = ISCSI_OP_REJECT;
3612 hdr->reason = cmd->reject_reason;
3613 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3614 hton24(hdr->dlength, ISCSI_HDR_LEN);
3615 hdr->ffffffff = cpu_to_be32(0xffffffff);
3616 cmd->stat_sn = conn->stat_sn++;
3617 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3618 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3619 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3620
3621 }
3622 EXPORT_SYMBOL(iscsit_build_reject);
3623
3624 static int iscsit_send_reject(
3625 struct iscsi_cmd *cmd,
3626 struct iscsi_conn *conn)
3627 {
3628 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3629 struct kvec *iov;
3630 u32 iov_count = 0, tx_size;
3631
3632 iscsit_build_reject(cmd, conn, hdr);
3633
3634 iov = &cmd->iov_misc[0];
3635 iov[iov_count].iov_base = cmd->pdu;
3636 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3637 iov[iov_count].iov_base = cmd->buf_ptr;
3638 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3639
3640 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3641
3642 if (conn->conn_ops->HeaderDigest) {
3643 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3644
3645 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3646 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3647
3648 iov[0].iov_len += ISCSI_CRC_LEN;
3649 tx_size += ISCSI_CRC_LEN;
3650 pr_debug("Attaching CRC32 HeaderDigest for"
3651 " REJECT PDU 0x%08x\n", *header_digest);
3652 }
3653
3654 if (conn->conn_ops->DataDigest) {
3655 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3656 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3657
3658 iov[iov_count].iov_base = &cmd->data_crc;
3659 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3660 tx_size += ISCSI_CRC_LEN;
3661 pr_debug("Attaching CRC32 DataDigest for REJECT"
3662 " PDU 0x%08x\n", cmd->data_crc);
3663 }
3664
3665 cmd->iov_misc_count = iov_count;
3666 cmd->tx_size = tx_size;
3667
3668 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3669 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3670
3671 return 0;
3672 }
3673
3674 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3675 {
3676 struct iscsi_thread_set *ts = conn->thread_set;
3677 int ord, cpu;
3678 /*
3679 * thread_id is assigned from iscsit_global->ts_bitmap from
3680 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3681 *
3682 * Here we use thread_id to determine which CPU that this
3683 * iSCSI connection's iscsi_thread_set will be scheduled to
3684 * execute upon.
3685 */
3686 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3687 for_each_online_cpu(cpu) {
3688 if (ord-- == 0) {
3689 cpumask_set_cpu(cpu, conn->conn_cpumask);
3690 return;
3691 }
3692 }
3693 /*
3694 * This should never be reached..
3695 */
3696 dump_stack();
3697 cpumask_setall(conn->conn_cpumask);
3698 }
3699
3700 static inline void iscsit_thread_check_cpumask(
3701 struct iscsi_conn *conn,
3702 struct task_struct *p,
3703 int mode)
3704 {
3705 char buf[128];
3706 /*
3707 * mode == 1 signals iscsi_target_tx_thread() usage.
3708 * mode == 0 signals iscsi_target_rx_thread() usage.
3709 */
3710 if (mode == 1) {
3711 if (!conn->conn_tx_reset_cpumask)
3712 return;
3713 conn->conn_tx_reset_cpumask = 0;
3714 } else {
3715 if (!conn->conn_rx_reset_cpumask)
3716 return;
3717 conn->conn_rx_reset_cpumask = 0;
3718 }
3719 /*
3720 * Update the CPU mask for this single kthread so that
3721 * both TX and RX kthreads are scheduled to run on the
3722 * same CPU.
3723 */
3724 memset(buf, 0, 128);
3725 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3726 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3727 }
3728
3729 static int
3730 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3731 {
3732 int ret;
3733
3734 switch (state) {
3735 case ISTATE_SEND_R2T:
3736 ret = iscsit_send_r2t(cmd, conn);
3737 if (ret < 0)
3738 goto err;
3739 break;
3740 case ISTATE_REMOVE:
3741 spin_lock_bh(&conn->cmd_lock);
3742 list_del_init(&cmd->i_conn_node);
3743 spin_unlock_bh(&conn->cmd_lock);
3744
3745 iscsit_free_cmd(cmd, false);
3746 break;
3747 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3748 iscsit_mod_nopin_response_timer(conn);
3749 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3750 if (ret < 0)
3751 goto err;
3752 break;
3753 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3754 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3755 if (ret < 0)
3756 goto err;
3757 break;
3758 default:
3759 pr_err("Unknown Opcode: 0x%02x ITT:"
3760 " 0x%08x, i_state: %d on CID: %hu\n",
3761 cmd->iscsi_opcode, cmd->init_task_tag, state,
3762 conn->cid);
3763 goto err;
3764 }
3765
3766 return 0;
3767
3768 err:
3769 return -1;
3770 }
3771
3772 static int
3773 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3774 {
3775 struct iscsit_transport *t = conn->conn_transport;
3776 struct iscsi_queue_req *qr;
3777 struct iscsi_cmd *cmd;
3778 u8 state;
3779 int ret;
3780
3781 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3782 atomic_set(&conn->check_immediate_queue, 0);
3783 cmd = qr->cmd;
3784 state = qr->state;
3785 kmem_cache_free(lio_qr_cache, qr);
3786
3787 ret = t->iscsit_immediate_queue(conn, cmd, state);
3788 if (ret < 0)
3789 return ret;
3790 }
3791
3792 return 0;
3793 }
3794
3795 static int
3796 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3797 {
3798 int ret;
3799
3800 check_rsp_state:
3801 switch (state) {
3802 case ISTATE_SEND_DATAIN:
3803 ret = iscsit_send_datain(cmd, conn);
3804 if (ret < 0)
3805 goto err;
3806 else if (!ret)
3807 /* more drs */
3808 goto check_rsp_state;
3809 else if (ret == 1) {
3810 /* all done */
3811 spin_lock_bh(&cmd->istate_lock);
3812 cmd->i_state = ISTATE_SENT_STATUS;
3813 spin_unlock_bh(&cmd->istate_lock);
3814
3815 if (atomic_read(&conn->check_immediate_queue))
3816 return 1;
3817
3818 return 0;
3819 } else if (ret == 2) {
3820 /* Still must send status,
3821 SCF_TRANSPORT_TASK_SENSE was set */
3822 spin_lock_bh(&cmd->istate_lock);
3823 cmd->i_state = ISTATE_SEND_STATUS;
3824 spin_unlock_bh(&cmd->istate_lock);
3825 state = ISTATE_SEND_STATUS;
3826 goto check_rsp_state;
3827 }
3828
3829 break;
3830 case ISTATE_SEND_STATUS:
3831 case ISTATE_SEND_STATUS_RECOVERY:
3832 ret = iscsit_send_response(cmd, conn);
3833 break;
3834 case ISTATE_SEND_LOGOUTRSP:
3835 ret = iscsit_send_logout(cmd, conn);
3836 break;
3837 case ISTATE_SEND_ASYNCMSG:
3838 ret = iscsit_send_conn_drop_async_message(
3839 cmd, conn);
3840 break;
3841 case ISTATE_SEND_NOPIN:
3842 ret = iscsit_send_nopin(cmd, conn);
3843 break;
3844 case ISTATE_SEND_REJECT:
3845 ret = iscsit_send_reject(cmd, conn);
3846 break;
3847 case ISTATE_SEND_TASKMGTRSP:
3848 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3849 if (ret != 0)
3850 break;
3851 ret = iscsit_tmr_post_handler(cmd, conn);
3852 if (ret != 0)
3853 iscsit_fall_back_to_erl0(conn->sess);
3854 break;
3855 case ISTATE_SEND_TEXTRSP:
3856 ret = iscsit_send_text_rsp(cmd, conn);
3857 break;
3858 default:
3859 pr_err("Unknown Opcode: 0x%02x ITT:"
3860 " 0x%08x, i_state: %d on CID: %hu\n",
3861 cmd->iscsi_opcode, cmd->init_task_tag,
3862 state, conn->cid);
3863 goto err;
3864 }
3865 if (ret < 0)
3866 goto err;
3867
3868 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3869 iscsit_tx_thread_wait_for_tcp(conn);
3870 iscsit_unmap_iovec(cmd);
3871 goto err;
3872 }
3873 iscsit_unmap_iovec(cmd);
3874
3875 switch (state) {
3876 case ISTATE_SEND_LOGOUTRSP:
3877 if (!iscsit_logout_post_handler(cmd, conn))
3878 goto restart;
3879 /* fall through */
3880 case ISTATE_SEND_STATUS:
3881 case ISTATE_SEND_ASYNCMSG:
3882 case ISTATE_SEND_NOPIN:
3883 case ISTATE_SEND_STATUS_RECOVERY:
3884 case ISTATE_SEND_TEXTRSP:
3885 case ISTATE_SEND_TASKMGTRSP:
3886 case ISTATE_SEND_REJECT:
3887 spin_lock_bh(&cmd->istate_lock);
3888 cmd->i_state = ISTATE_SENT_STATUS;
3889 spin_unlock_bh(&cmd->istate_lock);
3890 break;
3891 default:
3892 pr_err("Unknown Opcode: 0x%02x ITT:"
3893 " 0x%08x, i_state: %d on CID: %hu\n",
3894 cmd->iscsi_opcode, cmd->init_task_tag,
3895 cmd->i_state, conn->cid);
3896 goto err;
3897 }
3898
3899 if (atomic_read(&conn->check_immediate_queue))
3900 return 1;
3901
3902 return 0;
3903
3904 err:
3905 return -1;
3906 restart:
3907 return -EAGAIN;
3908 }
3909
3910 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3911 {
3912 struct iscsit_transport *t = conn->conn_transport;
3913 struct iscsi_queue_req *qr;
3914 struct iscsi_cmd *cmd;
3915 u8 state;
3916 int ret;
3917
3918 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3919 cmd = qr->cmd;
3920 state = qr->state;
3921 kmem_cache_free(lio_qr_cache, qr);
3922
3923 ret = t->iscsit_response_queue(conn, cmd, state);
3924 if (ret == 1 || ret < 0)
3925 return ret;
3926 }
3927
3928 return 0;
3929 }
3930
3931 int iscsi_target_tx_thread(void *arg)
3932 {
3933 int ret = 0;
3934 struct iscsi_conn *conn;
3935 struct iscsi_thread_set *ts = arg;
3936 /*
3937 * Allow ourselves to be interrupted by SIGINT so that a
3938 * connection recovery / failure event can be triggered externally.
3939 */
3940 allow_signal(SIGINT);
3941
3942 restart:
3943 conn = iscsi_tx_thread_pre_handler(ts);
3944 if (!conn)
3945 goto out;
3946
3947 ret = 0;
3948
3949 while (!kthread_should_stop()) {
3950 /*
3951 * Ensure that both TX and RX per connection kthreads
3952 * are scheduled to run on the same CPU.
3953 */
3954 iscsit_thread_check_cpumask(conn, current, 1);
3955
3956 wait_event_interruptible(conn->queues_wq,
3957 !iscsit_conn_all_queues_empty(conn) ||
3958 ts->status == ISCSI_THREAD_SET_RESET);
3959
3960 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3961 signal_pending(current))
3962 goto transport_err;
3963
3964 get_immediate:
3965 ret = iscsit_handle_immediate_queue(conn);
3966 if (ret < 0)
3967 goto transport_err;
3968
3969 ret = iscsit_handle_response_queue(conn);
3970 if (ret == 1)
3971 goto get_immediate;
3972 else if (ret == -EAGAIN)
3973 goto restart;
3974 else if (ret < 0)
3975 goto transport_err;
3976 }
3977
3978 transport_err:
3979 iscsit_take_action_for_connection_exit(conn);
3980 goto restart;
3981 out:
3982 return 0;
3983 }
3984
3985 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3986 {
3987 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3988 struct iscsi_cmd *cmd;
3989 int ret = 0;
3990
3991 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3992 case ISCSI_OP_SCSI_CMD:
3993 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3994 if (!cmd)
3995 goto reject;
3996
3997 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3998 break;
3999 case ISCSI_OP_SCSI_DATA_OUT:
4000 ret = iscsit_handle_data_out(conn, buf);
4001 break;
4002 case ISCSI_OP_NOOP_OUT:
4003 cmd = NULL;
4004 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4005 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4006 if (!cmd)
4007 goto reject;
4008 }
4009 ret = iscsit_handle_nop_out(conn, cmd, buf);
4010 break;
4011 case ISCSI_OP_SCSI_TMFUNC:
4012 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4013 if (!cmd)
4014 goto reject;
4015
4016 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4017 break;
4018 case ISCSI_OP_TEXT:
4019 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4020 if (!cmd)
4021 goto reject;
4022
4023 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4024 break;
4025 case ISCSI_OP_LOGOUT:
4026 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4027 if (!cmd)
4028 goto reject;
4029
4030 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4031 if (ret > 0)
4032 wait_for_completion_timeout(&conn->conn_logout_comp,
4033 SECONDS_FOR_LOGOUT_COMP * HZ);
4034 break;
4035 case ISCSI_OP_SNACK:
4036 ret = iscsit_handle_snack(conn, buf);
4037 break;
4038 default:
4039 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4040 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4041 pr_err("Cannot recover from unknown"
4042 " opcode while ERL=0, closing iSCSI connection.\n");
4043 return -1;
4044 }
4045 if (!conn->conn_ops->OFMarker) {
4046 pr_err("Unable to recover from unknown"
4047 " opcode while OFMarker=No, closing iSCSI"
4048 " connection.\n");
4049 return -1;
4050 }
4051 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4052 pr_err("Unable to recover from unknown"
4053 " opcode, closing iSCSI connection.\n");
4054 return -1;
4055 }
4056 break;
4057 }
4058
4059 return ret;
4060 reject:
4061 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4062 }
4063
4064 int iscsi_target_rx_thread(void *arg)
4065 {
4066 int ret;
4067 u8 buffer[ISCSI_HDR_LEN], opcode;
4068 u32 checksum = 0, digest = 0;
4069 struct iscsi_conn *conn = NULL;
4070 struct iscsi_thread_set *ts = arg;
4071 struct kvec iov;
4072 /*
4073 * Allow ourselves to be interrupted by SIGINT so that a
4074 * connection recovery / failure event can be triggered externally.
4075 */
4076 allow_signal(SIGINT);
4077
4078 restart:
4079 conn = iscsi_rx_thread_pre_handler(ts);
4080 if (!conn)
4081 goto out;
4082
4083 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4084 struct completion comp;
4085 int rc;
4086
4087 init_completion(&comp);
4088 rc = wait_for_completion_interruptible(&comp);
4089 if (rc < 0)
4090 goto transport_err;
4091
4092 goto out;
4093 }
4094
4095 while (!kthread_should_stop()) {
4096 /*
4097 * Ensure that both TX and RX per connection kthreads
4098 * are scheduled to run on the same CPU.
4099 */
4100 iscsit_thread_check_cpumask(conn, current, 0);
4101
4102 memset(buffer, 0, ISCSI_HDR_LEN);
4103 memset(&iov, 0, sizeof(struct kvec));
4104
4105 iov.iov_base = buffer;
4106 iov.iov_len = ISCSI_HDR_LEN;
4107
4108 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4109 if (ret != ISCSI_HDR_LEN) {
4110 iscsit_rx_thread_wait_for_tcp(conn);
4111 goto transport_err;
4112 }
4113
4114 if (conn->conn_ops->HeaderDigest) {
4115 iov.iov_base = &digest;
4116 iov.iov_len = ISCSI_CRC_LEN;
4117
4118 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4119 if (ret != ISCSI_CRC_LEN) {
4120 iscsit_rx_thread_wait_for_tcp(conn);
4121 goto transport_err;
4122 }
4123
4124 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4125 buffer, ISCSI_HDR_LEN,
4126 0, NULL, (u8 *)&checksum);
4127
4128 if (digest != checksum) {
4129 pr_err("HeaderDigest CRC32C failed,"
4130 " received 0x%08x, computed 0x%08x\n",
4131 digest, checksum);
4132 /*
4133 * Set the PDU to 0xff so it will intentionally
4134 * hit default in the switch below.
4135 */
4136 memset(buffer, 0xff, ISCSI_HDR_LEN);
4137 atomic_long_inc(&conn->sess->conn_digest_errors);
4138 } else {
4139 pr_debug("Got HeaderDigest CRC32C"
4140 " 0x%08x\n", checksum);
4141 }
4142 }
4143
4144 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4145 goto transport_err;
4146
4147 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4148
4149 if (conn->sess->sess_ops->SessionType &&
4150 ((!(opcode & ISCSI_OP_TEXT)) ||
4151 (!(opcode & ISCSI_OP_LOGOUT)))) {
4152 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4153 " while in Discovery Session, rejecting.\n", opcode);
4154 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4155 buffer);
4156 goto transport_err;
4157 }
4158
4159 ret = iscsi_target_rx_opcode(conn, buffer);
4160 if (ret < 0)
4161 goto transport_err;
4162 }
4163
4164 transport_err:
4165 if (!signal_pending(current))
4166 atomic_set(&conn->transport_failed, 1);
4167 iscsit_take_action_for_connection_exit(conn);
4168 goto restart;
4169 out:
4170 return 0;
4171 }
4172
4173 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4174 {
4175 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4176 struct iscsi_session *sess = conn->sess;
4177 /*
4178 * We expect this function to only ever be called from either RX or TX
4179 * thread context via iscsit_close_connection() once the other context
4180 * has been reset -> returned sleeping pre-handler state.
4181 */
4182 spin_lock_bh(&conn->cmd_lock);
4183 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4184
4185 list_del_init(&cmd->i_conn_node);
4186 spin_unlock_bh(&conn->cmd_lock);
4187
4188 iscsit_increment_maxcmdsn(cmd, sess);
4189
4190 iscsit_free_cmd(cmd, true);
4191
4192 spin_lock_bh(&conn->cmd_lock);
4193 }
4194 spin_unlock_bh(&conn->cmd_lock);
4195 }
4196
4197 static void iscsit_stop_timers_for_cmds(
4198 struct iscsi_conn *conn)
4199 {
4200 struct iscsi_cmd *cmd;
4201
4202 spin_lock_bh(&conn->cmd_lock);
4203 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4204 if (cmd->data_direction == DMA_TO_DEVICE)
4205 iscsit_stop_dataout_timer(cmd);
4206 }
4207 spin_unlock_bh(&conn->cmd_lock);
4208 }
4209
4210 int iscsit_close_connection(
4211 struct iscsi_conn *conn)
4212 {
4213 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4214 struct iscsi_session *sess = conn->sess;
4215
4216 pr_debug("Closing iSCSI connection CID %hu on SID:"
4217 " %u\n", conn->cid, sess->sid);
4218 /*
4219 * Always up conn_logout_comp just in case the RX Thread is sleeping
4220 * and the logout response never got sent because the connection
4221 * failed.
4222 */
4223 complete(&conn->conn_logout_comp);
4224
4225 iscsi_release_thread_set(conn);
4226
4227 iscsit_stop_timers_for_cmds(conn);
4228 iscsit_stop_nopin_response_timer(conn);
4229 iscsit_stop_nopin_timer(conn);
4230
4231 if (conn->conn_transport->iscsit_wait_conn)
4232 conn->conn_transport->iscsit_wait_conn(conn);
4233
4234 iscsit_free_queue_reqs_for_conn(conn);
4235
4236 /*
4237 * During Connection recovery drop unacknowledged out of order
4238 * commands for this connection, and prepare the other commands
4239 * for realligence.
4240 *
4241 * During normal operation clear the out of order commands (but
4242 * do not free the struct iscsi_ooo_cmdsn's) and release all
4243 * struct iscsi_cmds.
4244 */
4245 if (atomic_read(&conn->connection_recovery)) {
4246 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4247 iscsit_prepare_cmds_for_realligance(conn);
4248 } else {
4249 iscsit_clear_ooo_cmdsns_for_conn(conn);
4250 iscsit_release_commands_from_conn(conn);
4251 }
4252
4253 /*
4254 * Handle decrementing session or connection usage count if
4255 * a logout response was not able to be sent because the
4256 * connection failed. Fall back to Session Recovery here.
4257 */
4258 if (atomic_read(&conn->conn_logout_remove)) {
4259 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4260 iscsit_dec_conn_usage_count(conn);
4261 iscsit_dec_session_usage_count(sess);
4262 }
4263 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4264 iscsit_dec_conn_usage_count(conn);
4265
4266 atomic_set(&conn->conn_logout_remove, 0);
4267 atomic_set(&sess->session_reinstatement, 0);
4268 atomic_set(&sess->session_fall_back_to_erl0, 1);
4269 }
4270
4271 spin_lock_bh(&sess->conn_lock);
4272 list_del(&conn->conn_list);
4273
4274 /*
4275 * Attempt to let the Initiator know this connection failed by
4276 * sending an Connection Dropped Async Message on another
4277 * active connection.
4278 */
4279 if (atomic_read(&conn->connection_recovery))
4280 iscsit_build_conn_drop_async_message(conn);
4281
4282 spin_unlock_bh(&sess->conn_lock);
4283
4284 /*
4285 * If connection reinstatement is being performed on this connection,
4286 * up the connection reinstatement semaphore that is being blocked on
4287 * in iscsit_cause_connection_reinstatement().
4288 */
4289 spin_lock_bh(&conn->state_lock);
4290 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4291 spin_unlock_bh(&conn->state_lock);
4292 complete(&conn->conn_wait_comp);
4293 wait_for_completion(&conn->conn_post_wait_comp);
4294 spin_lock_bh(&conn->state_lock);
4295 }
4296
4297 /*
4298 * If connection reinstatement is being performed on this connection
4299 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4300 * connection wait rcfr semaphore that is being blocked on
4301 * an iscsit_connection_reinstatement_rcfr().
4302 */
4303 if (atomic_read(&conn->connection_wait_rcfr)) {
4304 spin_unlock_bh(&conn->state_lock);
4305 complete(&conn->conn_wait_rcfr_comp);
4306 wait_for_completion(&conn->conn_post_wait_comp);
4307 spin_lock_bh(&conn->state_lock);
4308 }
4309 atomic_set(&conn->connection_reinstatement, 1);
4310 spin_unlock_bh(&conn->state_lock);
4311
4312 /*
4313 * If any other processes are accessing this connection pointer we
4314 * must wait until they have completed.
4315 */
4316 iscsit_check_conn_usage_count(conn);
4317
4318 if (conn->conn_rx_hash.tfm)
4319 crypto_free_hash(conn->conn_rx_hash.tfm);
4320 if (conn->conn_tx_hash.tfm)
4321 crypto_free_hash(conn->conn_tx_hash.tfm);
4322
4323 if (conn->conn_cpumask)
4324 free_cpumask_var(conn->conn_cpumask);
4325
4326 kfree(conn->conn_ops);
4327 conn->conn_ops = NULL;
4328
4329 if (conn->sock)
4330 sock_release(conn->sock);
4331
4332 if (conn->conn_transport->iscsit_free_conn)
4333 conn->conn_transport->iscsit_free_conn(conn);
4334
4335 iscsit_put_transport(conn->conn_transport);
4336
4337 conn->thread_set = NULL;
4338
4339 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4340 conn->conn_state = TARG_CONN_STATE_FREE;
4341 kfree(conn);
4342
4343 spin_lock_bh(&sess->conn_lock);
4344 atomic_dec(&sess->nconn);
4345 pr_debug("Decremented iSCSI connection count to %hu from node:"
4346 " %s\n", atomic_read(&sess->nconn),
4347 sess->sess_ops->InitiatorName);
4348 /*
4349 * Make sure that if one connection fails in an non ERL=2 iSCSI
4350 * Session that they all fail.
4351 */
4352 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4353 !atomic_read(&sess->session_logout))
4354 atomic_set(&sess->session_fall_back_to_erl0, 1);
4355
4356 /*
4357 * If this was not the last connection in the session, and we are
4358 * performing session reinstatement or falling back to ERL=0, call
4359 * iscsit_stop_session() without sleeping to shutdown the other
4360 * active connections.
4361 */
4362 if (atomic_read(&sess->nconn)) {
4363 if (!atomic_read(&sess->session_reinstatement) &&
4364 !atomic_read(&sess->session_fall_back_to_erl0)) {
4365 spin_unlock_bh(&sess->conn_lock);
4366 return 0;
4367 }
4368 if (!atomic_read(&sess->session_stop_active)) {
4369 atomic_set(&sess->session_stop_active, 1);
4370 spin_unlock_bh(&sess->conn_lock);
4371 iscsit_stop_session(sess, 0, 0);
4372 return 0;
4373 }
4374 spin_unlock_bh(&sess->conn_lock);
4375 return 0;
4376 }
4377
4378 /*
4379 * If this was the last connection in the session and one of the
4380 * following is occurring:
4381 *
4382 * Session Reinstatement is not being performed, and are falling back
4383 * to ERL=0 call iscsit_close_session().
4384 *
4385 * Session Logout was requested. iscsit_close_session() will be called
4386 * elsewhere.
4387 *
4388 * Session Continuation is not being performed, start the Time2Retain
4389 * handler and check if sleep_on_sess_wait_sem is active.
4390 */
4391 if (!atomic_read(&sess->session_reinstatement) &&
4392 atomic_read(&sess->session_fall_back_to_erl0)) {
4393 spin_unlock_bh(&sess->conn_lock);
4394 target_put_session(sess->se_sess);
4395
4396 return 0;
4397 } else if (atomic_read(&sess->session_logout)) {
4398 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4399 sess->session_state = TARG_SESS_STATE_FREE;
4400 spin_unlock_bh(&sess->conn_lock);
4401
4402 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4403 complete(&sess->session_wait_comp);
4404
4405 return 0;
4406 } else {
4407 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4408 sess->session_state = TARG_SESS_STATE_FAILED;
4409
4410 if (!atomic_read(&sess->session_continuation)) {
4411 spin_unlock_bh(&sess->conn_lock);
4412 iscsit_start_time2retain_handler(sess);
4413 } else
4414 spin_unlock_bh(&sess->conn_lock);
4415
4416 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4417 complete(&sess->session_wait_comp);
4418
4419 return 0;
4420 }
4421 spin_unlock_bh(&sess->conn_lock);
4422
4423 return 0;
4424 }
4425
4426 int iscsit_close_session(struct iscsi_session *sess)
4427 {
4428 struct iscsi_portal_group *tpg = sess->tpg;
4429 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4430
4431 if (atomic_read(&sess->nconn)) {
4432 pr_err("%d connection(s) still exist for iSCSI session"
4433 " to %s\n", atomic_read(&sess->nconn),
4434 sess->sess_ops->InitiatorName);
4435 BUG();
4436 }
4437
4438 spin_lock_bh(&se_tpg->session_lock);
4439 atomic_set(&sess->session_logout, 1);
4440 atomic_set(&sess->session_reinstatement, 1);
4441 iscsit_stop_time2retain_timer(sess);
4442 spin_unlock_bh(&se_tpg->session_lock);
4443
4444 /*
4445 * transport_deregister_session_configfs() will clear the
4446 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4447 * can be setting it again with __transport_register_session() in
4448 * iscsi_post_login_handler() again after the iscsit_stop_session()
4449 * completes in iscsi_np context.
4450 */
4451 transport_deregister_session_configfs(sess->se_sess);
4452
4453 /*
4454 * If any other processes are accessing this session pointer we must
4455 * wait until they have completed. If we are in an interrupt (the
4456 * time2retain handler) and contain and active session usage count we
4457 * restart the timer and exit.
4458 */
4459 if (!in_interrupt()) {
4460 if (iscsit_check_session_usage_count(sess) == 1)
4461 iscsit_stop_session(sess, 1, 1);
4462 } else {
4463 if (iscsit_check_session_usage_count(sess) == 2) {
4464 atomic_set(&sess->session_logout, 0);
4465 iscsit_start_time2retain_handler(sess);
4466 return 0;
4467 }
4468 }
4469
4470 transport_deregister_session(sess->se_sess);
4471
4472 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4473 iscsit_free_connection_recovery_entires(sess);
4474
4475 iscsit_free_all_ooo_cmdsns(sess);
4476
4477 spin_lock_bh(&se_tpg->session_lock);
4478 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4479 sess->session_state = TARG_SESS_STATE_FREE;
4480 pr_debug("Released iSCSI session from node: %s\n",
4481 sess->sess_ops->InitiatorName);
4482 tpg->nsessions--;
4483 if (tpg->tpg_tiqn)
4484 tpg->tpg_tiqn->tiqn_nsessions--;
4485
4486 pr_debug("Decremented number of active iSCSI Sessions on"
4487 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4488
4489 spin_lock(&sess_idr_lock);
4490 idr_remove(&sess_idr, sess->session_index);
4491 spin_unlock(&sess_idr_lock);
4492
4493 kfree(sess->sess_ops);
4494 sess->sess_ops = NULL;
4495 spin_unlock_bh(&se_tpg->session_lock);
4496
4497 kfree(sess);
4498 return 0;
4499 }
4500
4501 static void iscsit_logout_post_handler_closesession(
4502 struct iscsi_conn *conn)
4503 {
4504 struct iscsi_session *sess = conn->sess;
4505
4506 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4507 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4508
4509 atomic_set(&conn->conn_logout_remove, 0);
4510 complete(&conn->conn_logout_comp);
4511
4512 iscsit_dec_conn_usage_count(conn);
4513 iscsit_stop_session(sess, 1, 1);
4514 iscsit_dec_session_usage_count(sess);
4515 target_put_session(sess->se_sess);
4516 }
4517
4518 static void iscsit_logout_post_handler_samecid(
4519 struct iscsi_conn *conn)
4520 {
4521 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4522 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4523
4524 atomic_set(&conn->conn_logout_remove, 0);
4525 complete(&conn->conn_logout_comp);
4526
4527 iscsit_cause_connection_reinstatement(conn, 1);
4528 iscsit_dec_conn_usage_count(conn);
4529 }
4530
4531 static void iscsit_logout_post_handler_diffcid(
4532 struct iscsi_conn *conn,
4533 u16 cid)
4534 {
4535 struct iscsi_conn *l_conn;
4536 struct iscsi_session *sess = conn->sess;
4537
4538 if (!sess)
4539 return;
4540
4541 spin_lock_bh(&sess->conn_lock);
4542 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4543 if (l_conn->cid == cid) {
4544 iscsit_inc_conn_usage_count(l_conn);
4545 break;
4546 }
4547 }
4548 spin_unlock_bh(&sess->conn_lock);
4549
4550 if (!l_conn)
4551 return;
4552
4553 if (l_conn->sock)
4554 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4555
4556 spin_lock_bh(&l_conn->state_lock);
4557 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4558 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4559 spin_unlock_bh(&l_conn->state_lock);
4560
4561 iscsit_cause_connection_reinstatement(l_conn, 1);
4562 iscsit_dec_conn_usage_count(l_conn);
4563 }
4564
4565 /*
4566 * Return of 0 causes the TX thread to restart.
4567 */
4568 int iscsit_logout_post_handler(
4569 struct iscsi_cmd *cmd,
4570 struct iscsi_conn *conn)
4571 {
4572 int ret = 0;
4573
4574 switch (cmd->logout_reason) {
4575 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4576 switch (cmd->logout_response) {
4577 case ISCSI_LOGOUT_SUCCESS:
4578 case ISCSI_LOGOUT_CLEANUP_FAILED:
4579 default:
4580 iscsit_logout_post_handler_closesession(conn);
4581 break;
4582 }
4583 ret = 0;
4584 break;
4585 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4586 if (conn->cid == cmd->logout_cid) {
4587 switch (cmd->logout_response) {
4588 case ISCSI_LOGOUT_SUCCESS:
4589 case ISCSI_LOGOUT_CLEANUP_FAILED:
4590 default:
4591 iscsit_logout_post_handler_samecid(conn);
4592 break;
4593 }
4594 ret = 0;
4595 } else {
4596 switch (cmd->logout_response) {
4597 case ISCSI_LOGOUT_SUCCESS:
4598 iscsit_logout_post_handler_diffcid(conn,
4599 cmd->logout_cid);
4600 break;
4601 case ISCSI_LOGOUT_CID_NOT_FOUND:
4602 case ISCSI_LOGOUT_CLEANUP_FAILED:
4603 default:
4604 break;
4605 }
4606 ret = 1;
4607 }
4608 break;
4609 case ISCSI_LOGOUT_REASON_RECOVERY:
4610 switch (cmd->logout_response) {
4611 case ISCSI_LOGOUT_SUCCESS:
4612 case ISCSI_LOGOUT_CID_NOT_FOUND:
4613 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4614 case ISCSI_LOGOUT_CLEANUP_FAILED:
4615 default:
4616 break;
4617 }
4618 ret = 1;
4619 break;
4620 default:
4621 break;
4622
4623 }
4624 return ret;
4625 }
4626 EXPORT_SYMBOL(iscsit_logout_post_handler);
4627
4628 void iscsit_fail_session(struct iscsi_session *sess)
4629 {
4630 struct iscsi_conn *conn;
4631
4632 spin_lock_bh(&sess->conn_lock);
4633 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4634 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4635 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4636 }
4637 spin_unlock_bh(&sess->conn_lock);
4638
4639 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4640 sess->session_state = TARG_SESS_STATE_FAILED;
4641 }
4642
4643 int iscsit_free_session(struct iscsi_session *sess)
4644 {
4645 u16 conn_count = atomic_read(&sess->nconn);
4646 struct iscsi_conn *conn, *conn_tmp = NULL;
4647 int is_last;
4648
4649 spin_lock_bh(&sess->conn_lock);
4650 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4651
4652 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4653 conn_list) {
4654 if (conn_count == 0)
4655 break;
4656
4657 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4658 is_last = 1;
4659 } else {
4660 iscsit_inc_conn_usage_count(conn_tmp);
4661 is_last = 0;
4662 }
4663 iscsit_inc_conn_usage_count(conn);
4664
4665 spin_unlock_bh(&sess->conn_lock);
4666 iscsit_cause_connection_reinstatement(conn, 1);
4667 spin_lock_bh(&sess->conn_lock);
4668
4669 iscsit_dec_conn_usage_count(conn);
4670 if (is_last == 0)
4671 iscsit_dec_conn_usage_count(conn_tmp);
4672
4673 conn_count--;
4674 }
4675
4676 if (atomic_read(&sess->nconn)) {
4677 spin_unlock_bh(&sess->conn_lock);
4678 wait_for_completion(&sess->session_wait_comp);
4679 } else
4680 spin_unlock_bh(&sess->conn_lock);
4681
4682 target_put_session(sess->se_sess);
4683 return 0;
4684 }
4685
4686 void iscsit_stop_session(
4687 struct iscsi_session *sess,
4688 int session_sleep,
4689 int connection_sleep)
4690 {
4691 u16 conn_count = atomic_read(&sess->nconn);
4692 struct iscsi_conn *conn, *conn_tmp = NULL;
4693 int is_last;
4694
4695 spin_lock_bh(&sess->conn_lock);
4696 if (session_sleep)
4697 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4698
4699 if (connection_sleep) {
4700 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4701 conn_list) {
4702 if (conn_count == 0)
4703 break;
4704
4705 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4706 is_last = 1;
4707 } else {
4708 iscsit_inc_conn_usage_count(conn_tmp);
4709 is_last = 0;
4710 }
4711 iscsit_inc_conn_usage_count(conn);
4712
4713 spin_unlock_bh(&sess->conn_lock);
4714 iscsit_cause_connection_reinstatement(conn, 1);
4715 spin_lock_bh(&sess->conn_lock);
4716
4717 iscsit_dec_conn_usage_count(conn);
4718 if (is_last == 0)
4719 iscsit_dec_conn_usage_count(conn_tmp);
4720 conn_count--;
4721 }
4722 } else {
4723 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4724 iscsit_cause_connection_reinstatement(conn, 0);
4725 }
4726
4727 if (session_sleep && atomic_read(&sess->nconn)) {
4728 spin_unlock_bh(&sess->conn_lock);
4729 wait_for_completion(&sess->session_wait_comp);
4730 } else
4731 spin_unlock_bh(&sess->conn_lock);
4732 }
4733
4734 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4735 {
4736 struct iscsi_session *sess;
4737 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4738 struct se_session *se_sess, *se_sess_tmp;
4739 int session_count = 0;
4740
4741 spin_lock_bh(&se_tpg->session_lock);
4742 if (tpg->nsessions && !force) {
4743 spin_unlock_bh(&se_tpg->session_lock);
4744 return -1;
4745 }
4746
4747 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4748 sess_list) {
4749 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4750
4751 spin_lock(&sess->conn_lock);
4752 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4753 atomic_read(&sess->session_logout) ||
4754 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4755 spin_unlock(&sess->conn_lock);
4756 continue;
4757 }
4758 atomic_set(&sess->session_reinstatement, 1);
4759 spin_unlock(&sess->conn_lock);
4760 spin_unlock_bh(&se_tpg->session_lock);
4761
4762 iscsit_free_session(sess);
4763 spin_lock_bh(&se_tpg->session_lock);
4764
4765 session_count++;
4766 }
4767 spin_unlock_bh(&se_tpg->session_lock);
4768
4769 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4770 " Group: %hu\n", session_count, tpg->tpgt);
4771 return 0;
4772 }
4773
4774 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4775 MODULE_VERSION("4.1.x");
4776 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4777 MODULE_LICENSE("GPL");
4778
4779 module_init(iscsi_target_init_module);
4780 module_exit(iscsi_target_cleanup_module);
Linux with added FPC-III support