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Linux 3.11-rc3
[cris-mirror.git] / drivers / target / iscsi / iscsi_target.c
blobf73da43cdf9e9cfc625e6c8a1a0eaecbc183aedd
1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
5 *
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
7 *
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
20
21 #include <linux/string.h>
22 #include <linux/kthread.h>
23 #include <linux/crypto.h>
24 #include <linux/completion.h>
25 #include <linux/module.h>
26 #include <linux/idr.h>
27 #include <asm/unaligned.h>
28 #include <scsi/scsi_device.h>
29 #include <scsi/iscsi_proto.h>
30 #include <scsi/scsi_tcq.h>
31 #include <target/target_core_base.h>
32 #include <target/target_core_fabric.h>
33 #include <target/target_core_configfs.h>
34
35 #include "iscsi_target_core.h"
36 #include "iscsi_target_parameters.h"
37 #include "iscsi_target_seq_pdu_list.h"
38 #include "iscsi_target_tq.h"
39 #include "iscsi_target_configfs.h"
40 #include "iscsi_target_datain_values.h"
41 #include "iscsi_target_erl0.h"
42 #include "iscsi_target_erl1.h"
43 #include "iscsi_target_erl2.h"
44 #include "iscsi_target_login.h"
45 #include "iscsi_target_tmr.h"
46 #include "iscsi_target_tpg.h"
47 #include "iscsi_target_util.h"
48 #include "iscsi_target.h"
49 #include "iscsi_target_device.h"
50 #include "iscsi_target_stat.h"
51
52 #include <target/iscsi/iscsi_transport.h>
53
54 static LIST_HEAD(g_tiqn_list);
55 static LIST_HEAD(g_np_list);
56 static DEFINE_SPINLOCK(tiqn_lock);
57 static DEFINE_SPINLOCK(np_lock);
58
59 static struct idr tiqn_idr;
60 struct idr sess_idr;
61 struct mutex auth_id_lock;
62 spinlock_t sess_idr_lock;
63
64 struct iscsit_global *iscsit_global;
65
66 struct kmem_cache *lio_cmd_cache;
67 struct kmem_cache *lio_qr_cache;
68 struct kmem_cache *lio_dr_cache;
69 struct kmem_cache *lio_ooo_cache;
70 struct kmem_cache *lio_r2t_cache;
71
72 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
73 struct iscsi_scsi_req *, u32);
74
75 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
76 {
77 struct iscsi_tiqn *tiqn = NULL;
78
79 spin_lock(&tiqn_lock);
80 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
81 if (!strcmp(tiqn->tiqn, buf)) {
82
83 spin_lock(&tiqn->tiqn_state_lock);
84 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
85 tiqn->tiqn_access_count++;
86 spin_unlock(&tiqn->tiqn_state_lock);
87 spin_unlock(&tiqn_lock);
88 return tiqn;
89 }
90 spin_unlock(&tiqn->tiqn_state_lock);
91 }
92 }
93 spin_unlock(&tiqn_lock);
94
95 return NULL;
96 }
97
98 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
99 {
100 spin_lock(&tiqn->tiqn_state_lock);
101 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
102 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
103 spin_unlock(&tiqn->tiqn_state_lock);
104 return 0;
105 }
106 spin_unlock(&tiqn->tiqn_state_lock);
107
108 return -1;
109 }
110
111 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
112 {
113 spin_lock(&tiqn->tiqn_state_lock);
114 tiqn->tiqn_access_count--;
115 spin_unlock(&tiqn->tiqn_state_lock);
116 }
117
118 /*
119 * Note that IQN formatting is expected to be done in userspace, and
120 * no explict IQN format checks are done here.
121 */
122 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
123 {
124 struct iscsi_tiqn *tiqn = NULL;
125 int ret;
126
127 if (strlen(buf) >= ISCSI_IQN_LEN) {
128 pr_err("Target IQN exceeds %d bytes\n",
129 ISCSI_IQN_LEN);
130 return ERR_PTR(-EINVAL);
131 }
132
133 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
134 if (!tiqn) {
135 pr_err("Unable to allocate struct iscsi_tiqn\n");
136 return ERR_PTR(-ENOMEM);
137 }
138
139 sprintf(tiqn->tiqn, "%s", buf);
140 INIT_LIST_HEAD(&tiqn->tiqn_list);
141 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
142 spin_lock_init(&tiqn->tiqn_state_lock);
143 spin_lock_init(&tiqn->tiqn_tpg_lock);
144 spin_lock_init(&tiqn->sess_err_stats.lock);
145 spin_lock_init(&tiqn->login_stats.lock);
146 spin_lock_init(&tiqn->logout_stats.lock);
147
148 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
149
150 idr_preload(GFP_KERNEL);
151 spin_lock(&tiqn_lock);
152
153 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
154 if (ret < 0) {
155 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
156 spin_unlock(&tiqn_lock);
157 idr_preload_end();
158 kfree(tiqn);
159 return ERR_PTR(ret);
160 }
161 tiqn->tiqn_index = ret;
162 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
163
164 spin_unlock(&tiqn_lock);
165 idr_preload_end();
166
167 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
168
169 return tiqn;
170
171 }
172
173 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
174 {
175 /*
176 * Wait for accesses to said struct iscsi_tiqn to end.
177 */
178 spin_lock(&tiqn->tiqn_state_lock);
179 while (tiqn->tiqn_access_count != 0) {
180 spin_unlock(&tiqn->tiqn_state_lock);
181 msleep(10);
182 spin_lock(&tiqn->tiqn_state_lock);
183 }
184 spin_unlock(&tiqn->tiqn_state_lock);
185 }
186
187 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
188 {
189 /*
190 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
191 * while holding tiqn->tiqn_state_lock. This means that all subsequent
192 * attempts to access this struct iscsi_tiqn will fail from both transport
193 * fabric and control code paths.
194 */
195 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
196 pr_err("iscsit_set_tiqn_shutdown() failed\n");
197 return;
198 }
199
200 iscsit_wait_for_tiqn(tiqn);
201
202 spin_lock(&tiqn_lock);
203 list_del(&tiqn->tiqn_list);
204 idr_remove(&tiqn_idr, tiqn->tiqn_index);
205 spin_unlock(&tiqn_lock);
206
207 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
208 tiqn->tiqn);
209 kfree(tiqn);
210 }
211
212 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
213 {
214 int ret;
215 /*
216 * Determine if the network portal is accepting storage traffic.
217 */
218 spin_lock_bh(&np->np_thread_lock);
219 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
220 spin_unlock_bh(&np->np_thread_lock);
221 return -1;
222 }
223 if (np->np_login_tpg) {
224 pr_err("np->np_login_tpg() is not NULL!\n");
225 spin_unlock_bh(&np->np_thread_lock);
226 return -1;
227 }
228 spin_unlock_bh(&np->np_thread_lock);
229 /*
230 * Determine if the portal group is accepting storage traffic.
231 */
232 spin_lock_bh(&tpg->tpg_state_lock);
233 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
234 spin_unlock_bh(&tpg->tpg_state_lock);
235 return -1;
236 }
237 spin_unlock_bh(&tpg->tpg_state_lock);
238
239 /*
240 * Here we serialize access across the TIQN+TPG Tuple.
241 */
242 ret = mutex_lock_interruptible(&tpg->np_login_lock);
243 if ((ret != 0) || signal_pending(current))
244 return -1;
245
246 spin_lock_bh(&np->np_thread_lock);
247 np->np_login_tpg = tpg;
248 spin_unlock_bh(&np->np_thread_lock);
249
250 return 0;
251 }
252
253 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
254 {
255 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
256
257 spin_lock_bh(&np->np_thread_lock);
258 np->np_login_tpg = NULL;
259 spin_unlock_bh(&np->np_thread_lock);
260
261 mutex_unlock(&tpg->np_login_lock);
262
263 if (tiqn)
264 iscsit_put_tiqn_for_login(tiqn);
265
266 return 0;
267 }
268
269 bool iscsit_check_np_match(
270 struct __kernel_sockaddr_storage *sockaddr,
271 struct iscsi_np *np,
272 int network_transport)
273 {
274 struct sockaddr_in *sock_in, *sock_in_e;
275 struct sockaddr_in6 *sock_in6, *sock_in6_e;
276 bool ip_match = false;
277 u16 port;
278
279 if (sockaddr->ss_family == AF_INET6) {
280 sock_in6 = (struct sockaddr_in6 *)sockaddr;
281 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
282
283 if (!memcmp(&sock_in6->sin6_addr.in6_u,
284 &sock_in6_e->sin6_addr.in6_u,
285 sizeof(struct in6_addr)))
286 ip_match = true;
287
288 port = ntohs(sock_in6->sin6_port);
289 } else {
290 sock_in = (struct sockaddr_in *)sockaddr;
291 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
292
293 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
294 ip_match = true;
295
296 port = ntohs(sock_in->sin_port);
297 }
298
299 if ((ip_match == true) && (np->np_port == port) &&
300 (np->np_network_transport == network_transport))
301 return true;
302
303 return false;
304 }
305
306 static struct iscsi_np *iscsit_get_np(
307 struct __kernel_sockaddr_storage *sockaddr,
308 int network_transport)
309 {
310 struct iscsi_np *np;
311 bool match;
312
313 spin_lock_bh(&np_lock);
314 list_for_each_entry(np, &g_np_list, np_list) {
315 spin_lock(&np->np_thread_lock);
316 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
317 spin_unlock(&np->np_thread_lock);
318 continue;
319 }
320
321 match = iscsit_check_np_match(sockaddr, np, network_transport);
322 if (match == true) {
323 /*
324 * Increment the np_exports reference count now to
325 * prevent iscsit_del_np() below from being called
326 * while iscsi_tpg_add_network_portal() is called.
327 */
328 np->np_exports++;
329 spin_unlock(&np->np_thread_lock);
330 spin_unlock_bh(&np_lock);
331 return np;
332 }
333 spin_unlock(&np->np_thread_lock);
334 }
335 spin_unlock_bh(&np_lock);
336
337 return NULL;
338 }
339
340 struct iscsi_np *iscsit_add_np(
341 struct __kernel_sockaddr_storage *sockaddr,
342 char *ip_str,
343 int network_transport)
344 {
345 struct sockaddr_in *sock_in;
346 struct sockaddr_in6 *sock_in6;
347 struct iscsi_np *np;
348 int ret;
349 /*
350 * Locate the existing struct iscsi_np if already active..
351 */
352 np = iscsit_get_np(sockaddr, network_transport);
353 if (np)
354 return np;
355
356 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
357 if (!np) {
358 pr_err("Unable to allocate memory for struct iscsi_np\n");
359 return ERR_PTR(-ENOMEM);
360 }
361
362 np->np_flags |= NPF_IP_NETWORK;
363 if (sockaddr->ss_family == AF_INET6) {
364 sock_in6 = (struct sockaddr_in6 *)sockaddr;
365 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
366 np->np_port = ntohs(sock_in6->sin6_port);
367 } else {
368 sock_in = (struct sockaddr_in *)sockaddr;
369 sprintf(np->np_ip, "%s", ip_str);
370 np->np_port = ntohs(sock_in->sin_port);
371 }
372
373 np->np_network_transport = network_transport;
374 spin_lock_init(&np->np_thread_lock);
375 init_completion(&np->np_restart_comp);
376 INIT_LIST_HEAD(&np->np_list);
377
378 ret = iscsi_target_setup_login_socket(np, sockaddr);
379 if (ret != 0) {
380 kfree(np);
381 return ERR_PTR(ret);
382 }
383
384 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
385 if (IS_ERR(np->np_thread)) {
386 pr_err("Unable to create kthread: iscsi_np\n");
387 ret = PTR_ERR(np->np_thread);
388 kfree(np);
389 return ERR_PTR(ret);
390 }
391 /*
392 * Increment the np_exports reference count now to prevent
393 * iscsit_del_np() below from being run while a new call to
394 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
395 * active. We don't need to hold np->np_thread_lock at this
396 * point because iscsi_np has not been added to g_np_list yet.
397 */
398 np->np_exports = 1;
399
400 spin_lock_bh(&np_lock);
401 list_add_tail(&np->np_list, &g_np_list);
402 spin_unlock_bh(&np_lock);
403
404 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
405 np->np_ip, np->np_port, np->np_transport->name);
406
407 return np;
408 }
409
410 int iscsit_reset_np_thread(
411 struct iscsi_np *np,
412 struct iscsi_tpg_np *tpg_np,
413 struct iscsi_portal_group *tpg)
414 {
415 spin_lock_bh(&np->np_thread_lock);
416 if (tpg && tpg_np) {
417 /*
418 * The reset operation need only be performed when the
419 * passed struct iscsi_portal_group has a login in progress
420 * to one of the network portals.
421 */
422 if (tpg_np->tpg_np->np_login_tpg != tpg) {
423 spin_unlock_bh(&np->np_thread_lock);
424 return 0;
425 }
426 }
427 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
428 spin_unlock_bh(&np->np_thread_lock);
429 return 0;
430 }
431 np->np_thread_state = ISCSI_NP_THREAD_RESET;
432
433 if (np->np_thread) {
434 spin_unlock_bh(&np->np_thread_lock);
435 send_sig(SIGINT, np->np_thread, 1);
436 wait_for_completion(&np->np_restart_comp);
437 spin_lock_bh(&np->np_thread_lock);
438 }
439 spin_unlock_bh(&np->np_thread_lock);
440
441 return 0;
442 }
443
444 static void iscsit_free_np(struct iscsi_np *np)
445 {
446 if (np->np_socket)
447 sock_release(np->np_socket);
448 }
449
450 int iscsit_del_np(struct iscsi_np *np)
451 {
452 spin_lock_bh(&np->np_thread_lock);
453 np->np_exports--;
454 if (np->np_exports) {
455 spin_unlock_bh(&np->np_thread_lock);
456 return 0;
457 }
458 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
459 spin_unlock_bh(&np->np_thread_lock);
460
461 if (np->np_thread) {
462 /*
463 * We need to send the signal to wakeup Linux/Net
464 * which may be sleeping in sock_accept()..
465 */
466 send_sig(SIGINT, np->np_thread, 1);
467 kthread_stop(np->np_thread);
468 }
469
470 np->np_transport->iscsit_free_np(np);
471
472 spin_lock_bh(&np_lock);
473 list_del(&np->np_list);
474 spin_unlock_bh(&np_lock);
475
476 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
477 np->np_ip, np->np_port, np->np_transport->name);
478
479 iscsit_put_transport(np->np_transport);
480 kfree(np);
481 return 0;
482 }
483
484 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
485 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
486
487 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
488 {
489 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
490 return 0;
491 }
492
493 static struct iscsit_transport iscsi_target_transport = {
494 .name = "iSCSI/TCP",
495 .transport_type = ISCSI_TCP,
496 .owner = NULL,
497 .iscsit_setup_np = iscsit_setup_np,
498 .iscsit_accept_np = iscsit_accept_np,
499 .iscsit_free_np = iscsit_free_np,
500 .iscsit_alloc_cmd = iscsit_alloc_cmd,
501 .iscsit_get_login_rx = iscsit_get_login_rx,
502 .iscsit_put_login_tx = iscsit_put_login_tx,
503 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
504 .iscsit_immediate_queue = iscsit_immediate_queue,
505 .iscsit_response_queue = iscsit_response_queue,
506 .iscsit_queue_data_in = iscsit_queue_rsp,
507 .iscsit_queue_status = iscsit_queue_rsp,
508 };
509
510 static int __init iscsi_target_init_module(void)
511 {
512 int ret = 0;
513
514 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
515
516 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
517 if (!iscsit_global) {
518 pr_err("Unable to allocate memory for iscsit_global\n");
519 return -1;
520 }
521 mutex_init(&auth_id_lock);
522 spin_lock_init(&sess_idr_lock);
523 idr_init(&tiqn_idr);
524 idr_init(&sess_idr);
525
526 ret = iscsi_target_register_configfs();
527 if (ret < 0)
528 goto out;
529
530 ret = iscsi_thread_set_init();
531 if (ret < 0)
532 goto configfs_out;
533
534 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
535 TARGET_THREAD_SET_COUNT) {
536 pr_err("iscsi_allocate_thread_sets() returned"
537 " unexpected value!\n");
538 goto ts_out1;
539 }
540
541 lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
542 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
543 0, NULL);
544 if (!lio_cmd_cache) {
545 pr_err("Unable to kmem_cache_create() for"
546 " lio_cmd_cache\n");
547 goto ts_out2;
548 }
549
550 lio_qr_cache = kmem_cache_create("lio_qr_cache",
551 sizeof(struct iscsi_queue_req),
552 __alignof__(struct iscsi_queue_req), 0, NULL);
553 if (!lio_qr_cache) {
554 pr_err("nable to kmem_cache_create() for"
555 " lio_qr_cache\n");
556 goto cmd_out;
557 }
558
559 lio_dr_cache = kmem_cache_create("lio_dr_cache",
560 sizeof(struct iscsi_datain_req),
561 __alignof__(struct iscsi_datain_req), 0, NULL);
562 if (!lio_dr_cache) {
563 pr_err("Unable to kmem_cache_create() for"
564 " lio_dr_cache\n");
565 goto qr_out;
566 }
567
568 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
569 sizeof(struct iscsi_ooo_cmdsn),
570 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
571 if (!lio_ooo_cache) {
572 pr_err("Unable to kmem_cache_create() for"
573 " lio_ooo_cache\n");
574 goto dr_out;
575 }
576
577 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
578 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
579 0, NULL);
580 if (!lio_r2t_cache) {
581 pr_err("Unable to kmem_cache_create() for"
582 " lio_r2t_cache\n");
583 goto ooo_out;
584 }
585
586 iscsit_register_transport(&iscsi_target_transport);
587
588 if (iscsit_load_discovery_tpg() < 0)
589 goto r2t_out;
590
591 return ret;
592 r2t_out:
593 kmem_cache_destroy(lio_r2t_cache);
594 ooo_out:
595 kmem_cache_destroy(lio_ooo_cache);
596 dr_out:
597 kmem_cache_destroy(lio_dr_cache);
598 qr_out:
599 kmem_cache_destroy(lio_qr_cache);
600 cmd_out:
601 kmem_cache_destroy(lio_cmd_cache);
602 ts_out2:
603 iscsi_deallocate_thread_sets();
604 ts_out1:
605 iscsi_thread_set_free();
606 configfs_out:
607 iscsi_target_deregister_configfs();
608 out:
609 kfree(iscsit_global);
610 return -ENOMEM;
611 }
612
613 static void __exit iscsi_target_cleanup_module(void)
614 {
615 iscsi_deallocate_thread_sets();
616 iscsi_thread_set_free();
617 iscsit_release_discovery_tpg();
618 iscsit_unregister_transport(&iscsi_target_transport);
619 kmem_cache_destroy(lio_cmd_cache);
620 kmem_cache_destroy(lio_qr_cache);
621 kmem_cache_destroy(lio_dr_cache);
622 kmem_cache_destroy(lio_ooo_cache);
623 kmem_cache_destroy(lio_r2t_cache);
624
625 iscsi_target_deregister_configfs();
626
627 kfree(iscsit_global);
628 }
629
630 static int iscsit_add_reject(
631 struct iscsi_conn *conn,
632 u8 reason,
633 unsigned char *buf)
634 {
635 struct iscsi_cmd *cmd;
636
637 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
638 if (!cmd)
639 return -1;
640
641 cmd->iscsi_opcode = ISCSI_OP_REJECT;
642 cmd->reject_reason = reason;
643
644 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
645 if (!cmd->buf_ptr) {
646 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
647 iscsit_free_cmd(cmd, false);
648 return -1;
649 }
650
651 spin_lock_bh(&conn->cmd_lock);
652 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
653 spin_unlock_bh(&conn->cmd_lock);
654
655 cmd->i_state = ISTATE_SEND_REJECT;
656 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
657
658 return -1;
659 }
660
661 static int iscsit_add_reject_from_cmd(
662 struct iscsi_cmd *cmd,
663 u8 reason,
664 bool add_to_conn,
665 unsigned char *buf)
666 {
667 struct iscsi_conn *conn;
668
669 if (!cmd->conn) {
670 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
671 cmd->init_task_tag);
672 return -1;
673 }
674 conn = cmd->conn;
675
676 cmd->iscsi_opcode = ISCSI_OP_REJECT;
677 cmd->reject_reason = reason;
678
679 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
680 if (!cmd->buf_ptr) {
681 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
682 iscsit_free_cmd(cmd, false);
683 return -1;
684 }
685
686 if (add_to_conn) {
687 spin_lock_bh(&conn->cmd_lock);
688 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
689 spin_unlock_bh(&conn->cmd_lock);
690 }
691
692 cmd->i_state = ISTATE_SEND_REJECT;
693 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
694 /*
695 * Perform the kref_put now if se_cmd has already been setup by
696 * scsit_setup_scsi_cmd()
697 */
698 if (cmd->se_cmd.se_tfo != NULL) {
699 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
700 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
701 }
702 return -1;
703 }
704
705 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
706 unsigned char *buf)
707 {
708 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
709 }
710
711 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
712 {
713 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
714 }
715
716 /*
717 * Map some portion of the allocated scatterlist to an iovec, suitable for
718 * kernel sockets to copy data in/out.
719 */
720 static int iscsit_map_iovec(
721 struct iscsi_cmd *cmd,
722 struct kvec *iov,
723 u32 data_offset,
724 u32 data_length)
725 {
726 u32 i = 0;
727 struct scatterlist *sg;
728 unsigned int page_off;
729
730 /*
731 * We know each entry in t_data_sg contains a page.
732 */
733 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
734 page_off = (data_offset % PAGE_SIZE);
735
736 cmd->first_data_sg = sg;
737 cmd->first_data_sg_off = page_off;
738
739 while (data_length) {
740 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
741
742 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
743 iov[i].iov_len = cur_len;
744
745 data_length -= cur_len;
746 page_off = 0;
747 sg = sg_next(sg);
748 i++;
749 }
750
751 cmd->kmapped_nents = i;
752
753 return i;
754 }
755
756 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
757 {
758 u32 i;
759 struct scatterlist *sg;
760
761 sg = cmd->first_data_sg;
762
763 for (i = 0; i < cmd->kmapped_nents; i++)
764 kunmap(sg_page(&sg[i]));
765 }
766
767 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
768 {
769 struct iscsi_cmd *cmd;
770
771 conn->exp_statsn = exp_statsn;
772
773 if (conn->sess->sess_ops->RDMAExtensions)
774 return;
775
776 spin_lock_bh(&conn->cmd_lock);
777 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
778 spin_lock(&cmd->istate_lock);
779 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
780 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
781 cmd->i_state = ISTATE_REMOVE;
782 spin_unlock(&cmd->istate_lock);
783 iscsit_add_cmd_to_immediate_queue(cmd, conn,
784 cmd->i_state);
785 continue;
786 }
787 spin_unlock(&cmd->istate_lock);
788 }
789 spin_unlock_bh(&conn->cmd_lock);
790 }
791
792 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
793 {
794 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
795
796 iov_count += ISCSI_IOV_DATA_BUFFER;
797
798 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
799 if (!cmd->iov_data) {
800 pr_err("Unable to allocate cmd->iov_data\n");
801 return -ENOMEM;
802 }
803
804 cmd->orig_iov_data_count = iov_count;
805 return 0;
806 }
807
808 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
809 unsigned char *buf)
810 {
811 int data_direction, payload_length;
812 struct iscsi_scsi_req *hdr;
813 int iscsi_task_attr;
814 int sam_task_attr;
815
816 spin_lock_bh(&conn->sess->session_stats_lock);
817 conn->sess->cmd_pdus++;
818 if (conn->sess->se_sess->se_node_acl) {
819 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
820 conn->sess->se_sess->se_node_acl->num_cmds++;
821 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
822 }
823 spin_unlock_bh(&conn->sess->session_stats_lock);
824
825 hdr = (struct iscsi_scsi_req *) buf;
826 payload_length = ntoh24(hdr->dlength);
827
828 /* FIXME; Add checks for AdditionalHeaderSegment */
829
830 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
831 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
832 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
833 " not set. Bad iSCSI Initiator.\n");
834 return iscsit_add_reject_cmd(cmd,
835 ISCSI_REASON_BOOKMARK_INVALID, buf);
836 }
837
838 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
839 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
840 /*
841 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
842 * that adds support for RESERVE/RELEASE. There is a bug
843 * add with this new functionality that sets R/W bits when
844 * neither CDB carries any READ or WRITE datapayloads.
845 */
846 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
847 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
848 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
849 goto done;
850 }
851
852 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
853 " set when Expected Data Transfer Length is 0 for"
854 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
855 return iscsit_add_reject_cmd(cmd,
856 ISCSI_REASON_BOOKMARK_INVALID, buf);
857 }
858 done:
859
860 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
861 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
862 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
863 " MUST be set if Expected Data Transfer Length is not 0."
864 " Bad iSCSI Initiator\n");
865 return iscsit_add_reject_cmd(cmd,
866 ISCSI_REASON_BOOKMARK_INVALID, buf);
867 }
868
869 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
870 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
871 pr_err("Bidirectional operations not supported!\n");
872 return iscsit_add_reject_cmd(cmd,
873 ISCSI_REASON_BOOKMARK_INVALID, buf);
874 }
875
876 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
877 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
878 " Scsi Command PDU.\n");
879 return iscsit_add_reject_cmd(cmd,
880 ISCSI_REASON_BOOKMARK_INVALID, buf);
881 }
882
883 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
884 pr_err("ImmediateData=No but DataSegmentLength=%u,"
885 " protocol error.\n", payload_length);
886 return iscsit_add_reject_cmd(cmd,
887 ISCSI_REASON_PROTOCOL_ERROR, buf);
888 }
889
890 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
891 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
892 pr_err("Expected Data Transfer Length and Length of"
893 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
894 " bit is not set protocol error\n");
895 return iscsit_add_reject_cmd(cmd,
896 ISCSI_REASON_PROTOCOL_ERROR, buf);
897 }
898
899 if (payload_length > be32_to_cpu(hdr->data_length)) {
900 pr_err("DataSegmentLength: %u is greater than"
901 " EDTL: %u, protocol error.\n", payload_length,
902 hdr->data_length);
903 return iscsit_add_reject_cmd(cmd,
904 ISCSI_REASON_PROTOCOL_ERROR, buf);
905 }
906
907 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
908 pr_err("DataSegmentLength: %u is greater than"
909 " MaxXmitDataSegmentLength: %u, protocol error.\n",
910 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
911 return iscsit_add_reject_cmd(cmd,
912 ISCSI_REASON_PROTOCOL_ERROR, buf);
913 }
914
915 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
916 pr_err("DataSegmentLength: %u is greater than"
917 " FirstBurstLength: %u, protocol error.\n",
918 payload_length, conn->sess->sess_ops->FirstBurstLength);
919 return iscsit_add_reject_cmd(cmd,
920 ISCSI_REASON_BOOKMARK_INVALID, buf);
921 }
922
923 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
924 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
925 DMA_NONE;
926
927 cmd->data_direction = data_direction;
928 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
929 /*
930 * Figure out the SAM Task Attribute for the incoming SCSI CDB
931 */
932 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
933 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
934 sam_task_attr = MSG_SIMPLE_TAG;
935 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
936 sam_task_attr = MSG_ORDERED_TAG;
937 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
938 sam_task_attr = MSG_HEAD_TAG;
939 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
940 sam_task_attr = MSG_ACA_TAG;
941 else {
942 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
943 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
944 sam_task_attr = MSG_SIMPLE_TAG;
945 }
946
947 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
948 cmd->i_state = ISTATE_NEW_CMD;
949 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
950 cmd->immediate_data = (payload_length) ? 1 : 0;
951 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
952 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
953 if (cmd->unsolicited_data)
954 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
955
956 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
957 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
958 spin_lock_bh(&conn->sess->ttt_lock);
959 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
960 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
961 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
962 spin_unlock_bh(&conn->sess->ttt_lock);
963 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
964 cmd->targ_xfer_tag = 0xFFFFFFFF;
965 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
966 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
967 cmd->first_burst_len = payload_length;
968
969 if (!conn->sess->sess_ops->RDMAExtensions &&
970 cmd->data_direction == DMA_FROM_DEVICE) {
971 struct iscsi_datain_req *dr;
972
973 dr = iscsit_allocate_datain_req();
974 if (!dr)
975 return iscsit_add_reject_cmd(cmd,
976 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
977
978 iscsit_attach_datain_req(cmd, dr);
979 }
980
981 /*
982 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
983 */
984 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
985 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
986 cmd->data_direction, sam_task_attr,
987 cmd->sense_buffer + 2);
988
989 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
990 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
991 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
992 conn->cid);
993
994 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
995
996 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
997 scsilun_to_int(&hdr->lun));
998 if (cmd->sense_reason)
999 goto attach_cmd;
1000
1001 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1002 if (cmd->sense_reason) {
1003 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1004 return iscsit_add_reject_cmd(cmd,
1005 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1006 }
1007
1008 goto attach_cmd;
1009 }
1010
1011 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1012 return iscsit_add_reject_cmd(cmd,
1013 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1014 }
1015
1016 attach_cmd:
1017 spin_lock_bh(&conn->cmd_lock);
1018 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1019 spin_unlock_bh(&conn->cmd_lock);
1020 /*
1021 * Check if we need to delay processing because of ALUA
1022 * Active/NonOptimized primary access state..
1023 */
1024 core_alua_check_nonop_delay(&cmd->se_cmd);
1025
1026 return 0;
1027 }
1028 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1029
1030 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1031 {
1032 iscsit_set_dataout_sequence_values(cmd);
1033
1034 spin_lock_bh(&cmd->dataout_timeout_lock);
1035 iscsit_start_dataout_timer(cmd, cmd->conn);
1036 spin_unlock_bh(&cmd->dataout_timeout_lock);
1037 }
1038 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1039
1040 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1041 struct iscsi_scsi_req *hdr)
1042 {
1043 int cmdsn_ret = 0;
1044 /*
1045 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1046 * the Immediate Bit is not set, and no Immediate
1047 * Data is attached.
1048 *
1049 * A PDU/CmdSN carrying Immediate Data can only
1050 * be processed after the DataCRC has passed.
1051 * If the DataCRC fails, the CmdSN MUST NOT
1052 * be acknowledged. (See below)
1053 */
1054 if (!cmd->immediate_data) {
1055 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1056 (unsigned char *)hdr, hdr->cmdsn);
1057 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1058 return -1;
1059 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1060 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1061 return 0;
1062 }
1063 }
1064
1065 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1066
1067 /*
1068 * If no Immediate Data is attached, it's OK to return now.
1069 */
1070 if (!cmd->immediate_data) {
1071 if (!cmd->sense_reason && cmd->unsolicited_data)
1072 iscsit_set_unsoliticed_dataout(cmd);
1073 if (!cmd->sense_reason)
1074 return 0;
1075
1076 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1077 return 0;
1078 }
1079
1080 /*
1081 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1082 * execution. These exceptions are processed in CmdSN order using
1083 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1084 */
1085 if (cmd->sense_reason) {
1086 if (cmd->reject_reason)
1087 return 0;
1088
1089 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1090 return 1;
1091 }
1092 /*
1093 * Call directly into transport_generic_new_cmd() to perform
1094 * the backend memory allocation.
1095 */
1096 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1097 if (cmd->sense_reason)
1098 return 1;
1099
1100 return 0;
1101 }
1102 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1103
1104 static int
1105 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1106 bool dump_payload)
1107 {
1108 struct iscsi_conn *conn = cmd->conn;
1109 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1110 /*
1111 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1112 */
1113 if (dump_payload == true)
1114 goto after_immediate_data;
1115
1116 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1117 cmd->first_burst_len);
1118 after_immediate_data:
1119 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1120 /*
1121 * A PDU/CmdSN carrying Immediate Data passed
1122 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1123 * Immediate Bit is not set.
1124 */
1125 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1126 (unsigned char *)hdr, hdr->cmdsn);
1127 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
1128 return -1;
1129 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1130 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1131 return 0;
1132 }
1133
1134 if (cmd->sense_reason) {
1135 int rc;
1136
1137 rc = iscsit_dump_data_payload(cmd->conn,
1138 cmd->first_burst_len, 1);
1139 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1140 return rc;
1141 } else if (cmd->unsolicited_data)
1142 iscsit_set_unsoliticed_dataout(cmd);
1143
1144 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1145 /*
1146 * Immediate Data failed DataCRC and ERL>=1,
1147 * silently drop this PDU and let the initiator
1148 * plug the CmdSN gap.
1149 *
1150 * FIXME: Send Unsolicited NOPIN with reserved
1151 * TTT here to help the initiator figure out
1152 * the missing CmdSN, although they should be
1153 * intelligent enough to determine the missing
1154 * CmdSN and issue a retry to plug the sequence.
1155 */
1156 cmd->i_state = ISTATE_REMOVE;
1157 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1158 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1159 return -1;
1160
1161 return 0;
1162 }
1163
1164 static int
1165 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1166 unsigned char *buf)
1167 {
1168 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1169 int rc, immed_data;
1170 bool dump_payload = false;
1171
1172 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1173 if (rc < 0)
1174 return 0;
1175 /*
1176 * Allocation iovecs needed for struct socket operations for
1177 * traditional iSCSI block I/O.
1178 */
1179 if (iscsit_allocate_iovecs(cmd) < 0) {
1180 return iscsit_add_reject_cmd(cmd,
1181 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1182 }
1183 immed_data = cmd->immediate_data;
1184
1185 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1186 if (rc < 0)
1187 return rc;
1188 else if (rc > 0)
1189 dump_payload = true;
1190
1191 if (!immed_data)
1192 return 0;
1193
1194 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1195 }
1196
1197 static u32 iscsit_do_crypto_hash_sg(
1198 struct hash_desc *hash,
1199 struct iscsi_cmd *cmd,
1200 u32 data_offset,
1201 u32 data_length,
1202 u32 padding,
1203 u8 *pad_bytes)
1204 {
1205 u32 data_crc;
1206 u32 i;
1207 struct scatterlist *sg;
1208 unsigned int page_off;
1209
1210 crypto_hash_init(hash);
1211
1212 sg = cmd->first_data_sg;
1213 page_off = cmd->first_data_sg_off;
1214
1215 i = 0;
1216 while (data_length) {
1217 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1218
1219 crypto_hash_update(hash, &sg[i], cur_len);
1220
1221 data_length -= cur_len;
1222 page_off = 0;
1223 i++;
1224 }
1225
1226 if (padding) {
1227 struct scatterlist pad_sg;
1228
1229 sg_init_one(&pad_sg, pad_bytes, padding);
1230 crypto_hash_update(hash, &pad_sg, padding);
1231 }
1232 crypto_hash_final(hash, (u8 *) &data_crc);
1233
1234 return data_crc;
1235 }
1236
1237 static void iscsit_do_crypto_hash_buf(
1238 struct hash_desc *hash,
1239 const void *buf,
1240 u32 payload_length,
1241 u32 padding,
1242 u8 *pad_bytes,
1243 u8 *data_crc)
1244 {
1245 struct scatterlist sg;
1246
1247 crypto_hash_init(hash);
1248
1249 sg_init_one(&sg, buf, payload_length);
1250 crypto_hash_update(hash, &sg, payload_length);
1251
1252 if (padding) {
1253 sg_init_one(&sg, pad_bytes, padding);
1254 crypto_hash_update(hash, &sg, padding);
1255 }
1256 crypto_hash_final(hash, data_crc);
1257 }
1258
1259 int
1260 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1261 struct iscsi_cmd **out_cmd)
1262 {
1263 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1264 struct iscsi_cmd *cmd = NULL;
1265 struct se_cmd *se_cmd;
1266 u32 payload_length = ntoh24(hdr->dlength);
1267 int rc;
1268
1269 if (!payload_length) {
1270 pr_err("DataOUT payload is ZERO, protocol error.\n");
1271 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1272 buf);
1273 }
1274
1275 /* iSCSI write */
1276 spin_lock_bh(&conn->sess->session_stats_lock);
1277 conn->sess->rx_data_octets += payload_length;
1278 if (conn->sess->se_sess->se_node_acl) {
1279 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1280 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1281 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1282 }
1283 spin_unlock_bh(&conn->sess->session_stats_lock);
1284
1285 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1286 pr_err("DataSegmentLength: %u is greater than"
1287 " MaxXmitDataSegmentLength: %u\n", payload_length,
1288 conn->conn_ops->MaxXmitDataSegmentLength);
1289 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1290 buf);
1291 }
1292
1293 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1294 payload_length);
1295 if (!cmd)
1296 return 0;
1297
1298 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1299 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1300 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1301 payload_length, conn->cid);
1302
1303 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1304 pr_err("Command ITT: 0x%08x received DataOUT after"
1305 " last DataOUT received, dumping payload\n",
1306 cmd->init_task_tag);
1307 return iscsit_dump_data_payload(conn, payload_length, 1);
1308 }
1309
1310 if (cmd->data_direction != DMA_TO_DEVICE) {
1311 pr_err("Command ITT: 0x%08x received DataOUT for a"
1312 " NON-WRITE command.\n", cmd->init_task_tag);
1313 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
1314 }
1315 se_cmd = &cmd->se_cmd;
1316 iscsit_mod_dataout_timer(cmd);
1317
1318 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1319 pr_err("DataOut Offset: %u, Length %u greater than"
1320 " iSCSI Command EDTL %u, protocol error.\n",
1321 hdr->offset, payload_length, cmd->se_cmd.data_length);
1322 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1323 }
1324
1325 if (cmd->unsolicited_data) {
1326 int dump_unsolicited_data = 0;
1327
1328 if (conn->sess->sess_ops->InitialR2T) {
1329 pr_err("Received unexpected unsolicited data"
1330 " while InitialR2T=Yes, protocol error.\n");
1331 transport_send_check_condition_and_sense(&cmd->se_cmd,
1332 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1333 return -1;
1334 }
1335 /*
1336 * Special case for dealing with Unsolicited DataOUT
1337 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1338 * failures;
1339 */
1340
1341 /* Something's amiss if we're not in WRITE_PENDING state... */
1342 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1343 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1344 dump_unsolicited_data = 1;
1345
1346 if (dump_unsolicited_data) {
1347 /*
1348 * Check if a delayed TASK_ABORTED status needs to
1349 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1350 * received with the unsolicitied data out.
1351 */
1352 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1353 iscsit_stop_dataout_timer(cmd);
1354
1355 transport_check_aborted_status(se_cmd,
1356 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1357 return iscsit_dump_data_payload(conn, payload_length, 1);
1358 }
1359 } else {
1360 /*
1361 * For the normal solicited data path:
1362 *
1363 * Check for a delayed TASK_ABORTED status and dump any
1364 * incoming data out payload if one exists. Also, when the
1365 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1366 * data out sequence, we decrement outstanding_r2ts. Once
1367 * outstanding_r2ts reaches zero, go ahead and send the delayed
1368 * TASK_ABORTED status.
1369 */
1370 if (se_cmd->transport_state & CMD_T_ABORTED) {
1371 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1372 if (--cmd->outstanding_r2ts < 1) {
1373 iscsit_stop_dataout_timer(cmd);
1374 transport_check_aborted_status(
1375 se_cmd, 1);
1376 }
1377
1378 return iscsit_dump_data_payload(conn, payload_length, 1);
1379 }
1380 }
1381 /*
1382 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1383 * within-command recovery checks before receiving the payload.
1384 */
1385 rc = iscsit_check_pre_dataout(cmd, buf);
1386 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1387 return 0;
1388 else if (rc == DATAOUT_CANNOT_RECOVER)
1389 return -1;
1390
1391 *out_cmd = cmd;
1392 return 0;
1393 }
1394 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1395
1396 static int
1397 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1398 struct iscsi_data *hdr)
1399 {
1400 struct kvec *iov;
1401 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1402 u32 payload_length = ntoh24(hdr->dlength);
1403 int iov_ret, data_crc_failed = 0;
1404
1405 rx_size += payload_length;
1406 iov = &cmd->iov_data[0];
1407
1408 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1409 payload_length);
1410 if (iov_ret < 0)
1411 return -1;
1412
1413 iov_count += iov_ret;
1414
1415 padding = ((-payload_length) & 3);
1416 if (padding != 0) {
1417 iov[iov_count].iov_base = cmd->pad_bytes;
1418 iov[iov_count++].iov_len = padding;
1419 rx_size += padding;
1420 pr_debug("Receiving %u padding bytes.\n", padding);
1421 }
1422
1423 if (conn->conn_ops->DataDigest) {
1424 iov[iov_count].iov_base = &checksum;
1425 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1426 rx_size += ISCSI_CRC_LEN;
1427 }
1428
1429 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1430
1431 iscsit_unmap_iovec(cmd);
1432
1433 if (rx_got != rx_size)
1434 return -1;
1435
1436 if (conn->conn_ops->DataDigest) {
1437 u32 data_crc;
1438
1439 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1440 be32_to_cpu(hdr->offset),
1441 payload_length, padding,
1442 cmd->pad_bytes);
1443
1444 if (checksum != data_crc) {
1445 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1446 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1447 " does not match computed 0x%08x\n",
1448 hdr->itt, hdr->offset, payload_length,
1449 hdr->datasn, checksum, data_crc);
1450 data_crc_failed = 1;
1451 } else {
1452 pr_debug("Got CRC32C DataDigest 0x%08x for"
1453 " %u bytes of Data Out\n", checksum,
1454 payload_length);
1455 }
1456 }
1457
1458 return data_crc_failed;
1459 }
1460
1461 int
1462 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1463 bool data_crc_failed)
1464 {
1465 struct iscsi_conn *conn = cmd->conn;
1466 int rc, ooo_cmdsn;
1467 /*
1468 * Increment post receive data and CRC values or perform
1469 * within-command recovery.
1470 */
1471 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1472 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1473 return 0;
1474 else if (rc == DATAOUT_SEND_R2T) {
1475 iscsit_set_dataout_sequence_values(cmd);
1476 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1477 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1478 /*
1479 * Handle extra special case for out of order
1480 * Unsolicited Data Out.
1481 */
1482 spin_lock_bh(&cmd->istate_lock);
1483 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1484 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1485 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1486 spin_unlock_bh(&cmd->istate_lock);
1487
1488 iscsit_stop_dataout_timer(cmd);
1489 if (ooo_cmdsn)
1490 return 0;
1491 target_execute_cmd(&cmd->se_cmd);
1492 return 0;
1493 } else /* DATAOUT_CANNOT_RECOVER */
1494 return -1;
1495
1496 return 0;
1497 }
1498 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1499
1500 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1501 {
1502 struct iscsi_cmd *cmd;
1503 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1504 int rc;
1505 bool data_crc_failed = false;
1506
1507 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1508 if (rc < 0)
1509 return 0;
1510 else if (!cmd)
1511 return 0;
1512
1513 rc = iscsit_get_dataout(conn, cmd, hdr);
1514 if (rc < 0)
1515 return rc;
1516 else if (rc > 0)
1517 data_crc_failed = true;
1518
1519 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1520 }
1521
1522 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1523 struct iscsi_nopout *hdr)
1524 {
1525 u32 payload_length = ntoh24(hdr->dlength);
1526
1527 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1528 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1529 " not set, protocol error.\n");
1530 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1531 (unsigned char *)hdr);
1532 }
1533
1534 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1535 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1536 " greater than MaxXmitDataSegmentLength: %u, protocol"
1537 " error.\n", payload_length,
1538 conn->conn_ops->MaxXmitDataSegmentLength);
1539 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1540 (unsigned char *)hdr);
1541 }
1542
1543 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1544 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1545 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1546 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1547 payload_length);
1548 /*
1549 * This is not a response to a Unsolicited NopIN, which means
1550 * it can either be a NOPOUT ping request (with a valid ITT),
1551 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1552 * Either way, make sure we allocate an struct iscsi_cmd, as both
1553 * can contain ping data.
1554 */
1555 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1556 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1557 cmd->i_state = ISTATE_SEND_NOPIN;
1558 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1559 1 : 0);
1560 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1561 cmd->targ_xfer_tag = 0xFFFFFFFF;
1562 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1563 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1564 cmd->data_direction = DMA_NONE;
1565 }
1566
1567 return 0;
1568 }
1569 EXPORT_SYMBOL(iscsit_setup_nop_out);
1570
1571 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1572 struct iscsi_nopout *hdr)
1573 {
1574 struct iscsi_cmd *cmd_p = NULL;
1575 int cmdsn_ret = 0;
1576 /*
1577 * Initiator is expecting a NopIN ping reply..
1578 */
1579 if (hdr->itt != RESERVED_ITT) {
1580 BUG_ON(!cmd);
1581
1582 spin_lock_bh(&conn->cmd_lock);
1583 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1584 spin_unlock_bh(&conn->cmd_lock);
1585
1586 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1587
1588 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1589 iscsit_add_cmd_to_response_queue(cmd, conn,
1590 cmd->i_state);
1591 return 0;
1592 }
1593
1594 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1595 (unsigned char *)hdr, hdr->cmdsn);
1596 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1597 return 0;
1598 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1599 return -1;
1600
1601 return 0;
1602 }
1603 /*
1604 * This was a response to a unsolicited NOPIN ping.
1605 */
1606 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1607 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1608 if (!cmd_p)
1609 return -EINVAL;
1610
1611 iscsit_stop_nopin_response_timer(conn);
1612
1613 cmd_p->i_state = ISTATE_REMOVE;
1614 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1615
1616 iscsit_start_nopin_timer(conn);
1617 return 0;
1618 }
1619 /*
1620 * Otherwise, initiator is not expecting a NOPIN is response.
1621 * Just ignore for now.
1622 */
1623 return 0;
1624 }
1625 EXPORT_SYMBOL(iscsit_process_nop_out);
1626
1627 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1628 unsigned char *buf)
1629 {
1630 unsigned char *ping_data = NULL;
1631 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1632 struct kvec *iov = NULL;
1633 u32 payload_length = ntoh24(hdr->dlength);
1634 int ret;
1635
1636 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1637 if (ret < 0)
1638 return 0;
1639 /*
1640 * Handle NOP-OUT payload for traditional iSCSI sockets
1641 */
1642 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1643 u32 checksum, data_crc, padding = 0;
1644 int niov = 0, rx_got, rx_size = payload_length;
1645
1646 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1647 if (!ping_data) {
1648 pr_err("Unable to allocate memory for"
1649 " NOPOUT ping data.\n");
1650 ret = -1;
1651 goto out;
1652 }
1653
1654 iov = &cmd->iov_misc[0];
1655 iov[niov].iov_base = ping_data;
1656 iov[niov++].iov_len = payload_length;
1657
1658 padding = ((-payload_length) & 3);
1659 if (padding != 0) {
1660 pr_debug("Receiving %u additional bytes"
1661 " for padding.\n", padding);
1662 iov[niov].iov_base = &cmd->pad_bytes;
1663 iov[niov++].iov_len = padding;
1664 rx_size += padding;
1665 }
1666 if (conn->conn_ops->DataDigest) {
1667 iov[niov].iov_base = &checksum;
1668 iov[niov++].iov_len = ISCSI_CRC_LEN;
1669 rx_size += ISCSI_CRC_LEN;
1670 }
1671
1672 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1673 if (rx_got != rx_size) {
1674 ret = -1;
1675 goto out;
1676 }
1677
1678 if (conn->conn_ops->DataDigest) {
1679 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1680 ping_data, payload_length,
1681 padding, cmd->pad_bytes,
1682 (u8 *)&data_crc);
1683
1684 if (checksum != data_crc) {
1685 pr_err("Ping data CRC32C DataDigest"
1686 " 0x%08x does not match computed 0x%08x\n",
1687 checksum, data_crc);
1688 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1689 pr_err("Unable to recover from"
1690 " NOPOUT Ping DataCRC failure while in"
1691 " ERL=0.\n");
1692 ret = -1;
1693 goto out;
1694 } else {
1695 /*
1696 * Silently drop this PDU and let the
1697 * initiator plug the CmdSN gap.
1698 */
1699 pr_debug("Dropping NOPOUT"
1700 " Command CmdSN: 0x%08x due to"
1701 " DataCRC error.\n", hdr->cmdsn);
1702 ret = 0;
1703 goto out;
1704 }
1705 } else {
1706 pr_debug("Got CRC32C DataDigest"
1707 " 0x%08x for %u bytes of ping data.\n",
1708 checksum, payload_length);
1709 }
1710 }
1711
1712 ping_data[payload_length] = '\0';
1713 /*
1714 * Attach ping data to struct iscsi_cmd->buf_ptr.
1715 */
1716 cmd->buf_ptr = ping_data;
1717 cmd->buf_ptr_size = payload_length;
1718
1719 pr_debug("Got %u bytes of NOPOUT ping"
1720 " data.\n", payload_length);
1721 pr_debug("Ping Data: \"%s\"\n", ping_data);
1722 }
1723
1724 return iscsit_process_nop_out(conn, cmd, hdr);
1725 out:
1726 if (cmd)
1727 iscsit_free_cmd(cmd, false);
1728
1729 kfree(ping_data);
1730 return ret;
1731 }
1732
1733 int
1734 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1735 unsigned char *buf)
1736 {
1737 struct se_tmr_req *se_tmr;
1738 struct iscsi_tmr_req *tmr_req;
1739 struct iscsi_tm *hdr;
1740 int out_of_order_cmdsn = 0, ret;
1741 bool sess_ref = false;
1742 u8 function;
1743
1744 hdr = (struct iscsi_tm *) buf;
1745 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1746 function = hdr->flags;
1747
1748 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1749 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1750 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1751 hdr->rtt, hdr->refcmdsn, conn->cid);
1752
1753 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1754 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1755 hdr->rtt != RESERVED_ITT)) {
1756 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1757 hdr->rtt = RESERVED_ITT;
1758 }
1759
1760 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1761 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1762 pr_err("Task Management Request TASK_REASSIGN not"
1763 " issued as immediate command, bad iSCSI Initiator"
1764 "implementation\n");
1765 return iscsit_add_reject_cmd(cmd,
1766 ISCSI_REASON_PROTOCOL_ERROR, buf);
1767 }
1768 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1769 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1770 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1771
1772 cmd->data_direction = DMA_NONE;
1773
1774 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1775 if (!cmd->tmr_req) {
1776 pr_err("Unable to allocate memory for"
1777 " Task Management command!\n");
1778 return iscsit_add_reject_cmd(cmd,
1779 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1780 buf);
1781 }
1782
1783 /*
1784 * TASK_REASSIGN for ERL=2 / connection stays inside of
1785 * LIO-Target $FABRIC_MOD
1786 */
1787 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1788
1789 u8 tcm_function;
1790 int ret;
1791
1792 transport_init_se_cmd(&cmd->se_cmd,
1793 &lio_target_fabric_configfs->tf_ops,
1794 conn->sess->se_sess, 0, DMA_NONE,
1795 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1796
1797 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1798 sess_ref = true;
1799
1800 switch (function) {
1801 case ISCSI_TM_FUNC_ABORT_TASK:
1802 tcm_function = TMR_ABORT_TASK;
1803 break;
1804 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1805 tcm_function = TMR_ABORT_TASK_SET;
1806 break;
1807 case ISCSI_TM_FUNC_CLEAR_ACA:
1808 tcm_function = TMR_CLEAR_ACA;
1809 break;
1810 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1811 tcm_function = TMR_CLEAR_TASK_SET;
1812 break;
1813 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1814 tcm_function = TMR_LUN_RESET;
1815 break;
1816 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1817 tcm_function = TMR_TARGET_WARM_RESET;
1818 break;
1819 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1820 tcm_function = TMR_TARGET_COLD_RESET;
1821 break;
1822 default:
1823 pr_err("Unknown iSCSI TMR Function:"
1824 " 0x%02x\n", function);
1825 return iscsit_add_reject_cmd(cmd,
1826 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1827 }
1828
1829 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1830 tcm_function, GFP_KERNEL);
1831 if (ret < 0)
1832 return iscsit_add_reject_cmd(cmd,
1833 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1834
1835 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1836 }
1837
1838 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1839 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1840 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1841 cmd->init_task_tag = hdr->itt;
1842 cmd->targ_xfer_tag = 0xFFFFFFFF;
1843 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1844 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1845 se_tmr = cmd->se_cmd.se_tmr_req;
1846 tmr_req = cmd->tmr_req;
1847 /*
1848 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1849 */
1850 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1851 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1852 scsilun_to_int(&hdr->lun));
1853 if (ret < 0) {
1854 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1855 goto attach;
1856 }
1857 }
1858
1859 switch (function) {
1860 case ISCSI_TM_FUNC_ABORT_TASK:
1861 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1862 if (se_tmr->response)
1863 goto attach;
1864 break;
1865 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1866 case ISCSI_TM_FUNC_CLEAR_ACA:
1867 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1868 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1869 break;
1870 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1871 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1872 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1873 goto attach;
1874 }
1875 break;
1876 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1877 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1878 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1879 goto attach;
1880 }
1881 break;
1882 case ISCSI_TM_FUNC_TASK_REASSIGN:
1883 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1884 /*
1885 * Perform sanity checks on the ExpDataSN only if the
1886 * TASK_REASSIGN was successful.
1887 */
1888 if (se_tmr->response)
1889 break;
1890
1891 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1892 return iscsit_add_reject_cmd(cmd,
1893 ISCSI_REASON_BOOKMARK_INVALID, buf);
1894 break;
1895 default:
1896 pr_err("Unknown TMR function: 0x%02x, protocol"
1897 " error.\n", function);
1898 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1899 goto attach;
1900 }
1901
1902 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1903 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1904 se_tmr->call_transport = 1;
1905 attach:
1906 spin_lock_bh(&conn->cmd_lock);
1907 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1908 spin_unlock_bh(&conn->cmd_lock);
1909
1910 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1911 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1912 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1913 out_of_order_cmdsn = 1;
1914 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1915 return 0;
1916 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1917 return -1;
1918 }
1919 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1920
1921 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1922 return 0;
1923 /*
1924 * Found the referenced task, send to transport for processing.
1925 */
1926 if (se_tmr->call_transport)
1927 return transport_generic_handle_tmr(&cmd->se_cmd);
1928
1929 /*
1930 * Could not find the referenced LUN, task, or Task Management
1931 * command not authorized or supported. Change state and
1932 * let the tx_thread send the response.
1933 *
1934 * For connection recovery, this is also the default action for
1935 * TMR TASK_REASSIGN.
1936 */
1937 if (sess_ref) {
1938 pr_debug("Handle TMR, using sess_ref=true check\n");
1939 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1940 }
1941
1942 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1943 return 0;
1944 }
1945 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1946
1947 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1948 int
1949 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1950 struct iscsi_text *hdr)
1951 {
1952 u32 payload_length = ntoh24(hdr->dlength);
1953
1954 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1955 pr_err("Unable to accept text parameter length: %u"
1956 "greater than MaxXmitDataSegmentLength %u.\n",
1957 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1958 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1959 (unsigned char *)hdr);
1960 }
1961
1962 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1963 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1964 hdr->exp_statsn, payload_length);
1965
1966 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1967 cmd->i_state = ISTATE_SEND_TEXTRSP;
1968 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1969 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1970 cmd->targ_xfer_tag = 0xFFFFFFFF;
1971 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1972 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1973 cmd->data_direction = DMA_NONE;
1974
1975 return 0;
1976 }
1977 EXPORT_SYMBOL(iscsit_setup_text_cmd);
1978
1979 int
1980 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1981 struct iscsi_text *hdr)
1982 {
1983 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
1984 int cmdsn_ret;
1985
1986 if (!text_in) {
1987 pr_err("Unable to locate text_in buffer for sendtargets"
1988 " discovery\n");
1989 goto reject;
1990 }
1991 if (strncmp("SendTargets", text_in, 11) != 0) {
1992 pr_err("Received Text Data that is not"
1993 " SendTargets, cannot continue.\n");
1994 goto reject;
1995 }
1996 text_ptr = strchr(text_in, '=');
1997 if (!text_ptr) {
1998 pr_err("No \"=\" separator found in Text Data,"
1999 " cannot continue.\n");
2000 goto reject;
2001 }
2002 if (!strncmp("=All", text_ptr, 4)) {
2003 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
2004 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2005 !strncmp("=eui.", text_ptr, 5)) {
2006 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
2007 } else {
2008 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2009 goto reject;
2010 }
2011
2012 spin_lock_bh(&conn->cmd_lock);
2013 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2014 spin_unlock_bh(&conn->cmd_lock);
2015
2016 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2017
2018 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2019 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2020 (unsigned char *)hdr, hdr->cmdsn);
2021 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2022 return -1;
2023
2024 return 0;
2025 }
2026
2027 return iscsit_execute_cmd(cmd, 0);
2028
2029 reject:
2030 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2031 (unsigned char *)hdr);
2032 }
2033 EXPORT_SYMBOL(iscsit_process_text_cmd);
2034
2035 static int
2036 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2037 unsigned char *buf)
2038 {
2039 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2040 char *text_in = NULL;
2041 u32 payload_length = ntoh24(hdr->dlength);
2042 int rx_size, rc;
2043
2044 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2045 if (rc < 0)
2046 return 0;
2047
2048 rx_size = payload_length;
2049 if (payload_length) {
2050 u32 checksum = 0, data_crc = 0;
2051 u32 padding = 0, pad_bytes = 0;
2052 int niov = 0, rx_got;
2053 struct kvec iov[3];
2054
2055 text_in = kzalloc(payload_length, GFP_KERNEL);
2056 if (!text_in) {
2057 pr_err("Unable to allocate memory for"
2058 " incoming text parameters\n");
2059 goto reject;
2060 }
2061 cmd->text_in_ptr = text_in;
2062
2063 memset(iov, 0, 3 * sizeof(struct kvec));
2064 iov[niov].iov_base = text_in;
2065 iov[niov++].iov_len = payload_length;
2066
2067 padding = ((-payload_length) & 3);
2068 if (padding != 0) {
2069 iov[niov].iov_base = &pad_bytes;
2070 iov[niov++].iov_len = padding;
2071 rx_size += padding;
2072 pr_debug("Receiving %u additional bytes"
2073 " for padding.\n", padding);
2074 }
2075 if (conn->conn_ops->DataDigest) {
2076 iov[niov].iov_base = &checksum;
2077 iov[niov++].iov_len = ISCSI_CRC_LEN;
2078 rx_size += ISCSI_CRC_LEN;
2079 }
2080
2081 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2082 if (rx_got != rx_size)
2083 goto reject;
2084
2085 if (conn->conn_ops->DataDigest) {
2086 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2087 text_in, payload_length,
2088 padding, (u8 *)&pad_bytes,
2089 (u8 *)&data_crc);
2090
2091 if (checksum != data_crc) {
2092 pr_err("Text data CRC32C DataDigest"
2093 " 0x%08x does not match computed"
2094 " 0x%08x\n", checksum, data_crc);
2095 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2096 pr_err("Unable to recover from"
2097 " Text Data digest failure while in"
2098 " ERL=0.\n");
2099 goto reject;
2100 } else {
2101 /*
2102 * Silently drop this PDU and let the
2103 * initiator plug the CmdSN gap.
2104 */
2105 pr_debug("Dropping Text"
2106 " Command CmdSN: 0x%08x due to"
2107 " DataCRC error.\n", hdr->cmdsn);
2108 kfree(text_in);
2109 return 0;
2110 }
2111 } else {
2112 pr_debug("Got CRC32C DataDigest"
2113 " 0x%08x for %u bytes of text data.\n",
2114 checksum, payload_length);
2115 }
2116 }
2117 text_in[payload_length - 1] = '\0';
2118 pr_debug("Successfully read %d bytes of text"
2119 " data.\n", payload_length);
2120 }
2121
2122 return iscsit_process_text_cmd(conn, cmd, hdr);
2123
2124 reject:
2125 kfree(cmd->text_in_ptr);
2126 cmd->text_in_ptr = NULL;
2127 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2128 }
2129 EXPORT_SYMBOL(iscsit_handle_text_cmd);
2130
2131 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2132 {
2133 struct iscsi_conn *conn_p;
2134 struct iscsi_session *sess = conn->sess;
2135
2136 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2137 " for SID: %u.\n", conn->cid, conn->sess->sid);
2138
2139 atomic_set(&sess->session_logout, 1);
2140 atomic_set(&conn->conn_logout_remove, 1);
2141 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2142
2143 iscsit_inc_conn_usage_count(conn);
2144 iscsit_inc_session_usage_count(sess);
2145
2146 spin_lock_bh(&sess->conn_lock);
2147 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2148 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2149 continue;
2150
2151 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2152 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2153 }
2154 spin_unlock_bh(&sess->conn_lock);
2155
2156 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2157
2158 return 0;
2159 }
2160
2161 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2162 {
2163 struct iscsi_conn *l_conn;
2164 struct iscsi_session *sess = conn->sess;
2165
2166 pr_debug("Received logout request CLOSECONNECTION for CID:"
2167 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2168
2169 /*
2170 * A Logout Request with a CLOSECONNECTION reason code for a CID
2171 * can arrive on a connection with a differing CID.
2172 */
2173 if (conn->cid == cmd->logout_cid) {
2174 spin_lock_bh(&conn->state_lock);
2175 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2176 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2177
2178 atomic_set(&conn->conn_logout_remove, 1);
2179 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2180 iscsit_inc_conn_usage_count(conn);
2181
2182 spin_unlock_bh(&conn->state_lock);
2183 } else {
2184 /*
2185 * Handle all different cid CLOSECONNECTION requests in
2186 * iscsit_logout_post_handler_diffcid() as to give enough
2187 * time for any non immediate command's CmdSN to be
2188 * acknowledged on the connection in question.
2189 *
2190 * Here we simply make sure the CID is still around.
2191 */
2192 l_conn = iscsit_get_conn_from_cid(sess,
2193 cmd->logout_cid);
2194 if (!l_conn) {
2195 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2196 iscsit_add_cmd_to_response_queue(cmd, conn,
2197 cmd->i_state);
2198 return 0;
2199 }
2200
2201 iscsit_dec_conn_usage_count(l_conn);
2202 }
2203
2204 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2205
2206 return 0;
2207 }
2208
2209 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2210 {
2211 struct iscsi_session *sess = conn->sess;
2212
2213 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2214 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2215
2216 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2217 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2218 " while ERL!=2.\n");
2219 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2220 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2221 return 0;
2222 }
2223
2224 if (conn->cid == cmd->logout_cid) {
2225 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2226 " with CID: %hu on CID: %hu, implementation error.\n",
2227 cmd->logout_cid, conn->cid);
2228 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2229 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2230 return 0;
2231 }
2232
2233 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2234
2235 return 0;
2236 }
2237
2238 int
2239 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2240 unsigned char *buf)
2241 {
2242 int cmdsn_ret, logout_remove = 0;
2243 u8 reason_code = 0;
2244 struct iscsi_logout *hdr;
2245 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2246
2247 hdr = (struct iscsi_logout *) buf;
2248 reason_code = (hdr->flags & 0x7f);
2249
2250 if (tiqn) {
2251 spin_lock(&tiqn->logout_stats.lock);
2252 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2253 tiqn->logout_stats.normal_logouts++;
2254 else
2255 tiqn->logout_stats.abnormal_logouts++;
2256 spin_unlock(&tiqn->logout_stats.lock);
2257 }
2258
2259 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2260 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2261 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2262 hdr->cid, conn->cid);
2263
2264 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2265 pr_err("Received logout request on connection that"
2266 " is not in logged in state, ignoring request.\n");
2267 iscsit_free_cmd(cmd, false);
2268 return 0;
2269 }
2270
2271 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2272 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2273 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2274 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2275 cmd->targ_xfer_tag = 0xFFFFFFFF;
2276 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2277 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2278 cmd->logout_cid = be16_to_cpu(hdr->cid);
2279 cmd->logout_reason = reason_code;
2280 cmd->data_direction = DMA_NONE;
2281
2282 /*
2283 * We need to sleep in these cases (by returning 1) until the Logout
2284 * Response gets sent in the tx thread.
2285 */
2286 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2287 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2288 be16_to_cpu(hdr->cid) == conn->cid))
2289 logout_remove = 1;
2290
2291 spin_lock_bh(&conn->cmd_lock);
2292 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2293 spin_unlock_bh(&conn->cmd_lock);
2294
2295 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2296 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2297
2298 /*
2299 * Immediate commands are executed, well, immediately.
2300 * Non-Immediate Logout Commands are executed in CmdSN order.
2301 */
2302 if (cmd->immediate_cmd) {
2303 int ret = iscsit_execute_cmd(cmd, 0);
2304
2305 if (ret < 0)
2306 return ret;
2307 } else {
2308 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2309 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2310 logout_remove = 0;
2311 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2312 return -1;
2313 }
2314
2315 return logout_remove;
2316 }
2317 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2318
2319 static int iscsit_handle_snack(
2320 struct iscsi_conn *conn,
2321 unsigned char *buf)
2322 {
2323 struct iscsi_snack *hdr;
2324
2325 hdr = (struct iscsi_snack *) buf;
2326 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2327
2328 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2329 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2330 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2331 hdr->begrun, hdr->runlength, conn->cid);
2332
2333 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2334 pr_err("Initiator sent SNACK request while in"
2335 " ErrorRecoveryLevel=0.\n");
2336 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2337 buf);
2338 }
2339 /*
2340 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2341 * call from inside iscsi_send_recovery_datain_or_r2t().
2342 */
2343 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2344 case 0:
2345 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2346 hdr->itt,
2347 be32_to_cpu(hdr->ttt),
2348 be32_to_cpu(hdr->begrun),
2349 be32_to_cpu(hdr->runlength));
2350 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2351 return iscsit_handle_status_snack(conn, hdr->itt,
2352 be32_to_cpu(hdr->ttt),
2353 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2354 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2355 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2356 be32_to_cpu(hdr->begrun),
2357 be32_to_cpu(hdr->runlength));
2358 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2359 /* FIXME: Support R-Data SNACK */
2360 pr_err("R-Data SNACK Not Supported.\n");
2361 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2362 buf);
2363 default:
2364 pr_err("Unknown SNACK type 0x%02x, protocol"
2365 " error.\n", hdr->flags & 0x0f);
2366 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2367 buf);
2368 }
2369
2370 return 0;
2371 }
2372
2373 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2374 {
2375 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2376 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2377 wait_for_completion_interruptible_timeout(
2378 &conn->rx_half_close_comp,
2379 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2380 }
2381 }
2382
2383 static int iscsit_handle_immediate_data(
2384 struct iscsi_cmd *cmd,
2385 struct iscsi_scsi_req *hdr,
2386 u32 length)
2387 {
2388 int iov_ret, rx_got = 0, rx_size = 0;
2389 u32 checksum, iov_count = 0, padding = 0;
2390 struct iscsi_conn *conn = cmd->conn;
2391 struct kvec *iov;
2392
2393 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2394 if (iov_ret < 0)
2395 return IMMEDIATE_DATA_CANNOT_RECOVER;
2396
2397 rx_size = length;
2398 iov_count = iov_ret;
2399 iov = &cmd->iov_data[0];
2400
2401 padding = ((-length) & 3);
2402 if (padding != 0) {
2403 iov[iov_count].iov_base = cmd->pad_bytes;
2404 iov[iov_count++].iov_len = padding;
2405 rx_size += padding;
2406 }
2407
2408 if (conn->conn_ops->DataDigest) {
2409 iov[iov_count].iov_base = &checksum;
2410 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2411 rx_size += ISCSI_CRC_LEN;
2412 }
2413
2414 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2415
2416 iscsit_unmap_iovec(cmd);
2417
2418 if (rx_got != rx_size) {
2419 iscsit_rx_thread_wait_for_tcp(conn);
2420 return IMMEDIATE_DATA_CANNOT_RECOVER;
2421 }
2422
2423 if (conn->conn_ops->DataDigest) {
2424 u32 data_crc;
2425
2426 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2427 cmd->write_data_done, length, padding,
2428 cmd->pad_bytes);
2429
2430 if (checksum != data_crc) {
2431 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2432 " does not match computed 0x%08x\n", checksum,
2433 data_crc);
2434
2435 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2436 pr_err("Unable to recover from"
2437 " Immediate Data digest failure while"
2438 " in ERL=0.\n");
2439 iscsit_reject_cmd(cmd,
2440 ISCSI_REASON_DATA_DIGEST_ERROR,
2441 (unsigned char *)hdr);
2442 return IMMEDIATE_DATA_CANNOT_RECOVER;
2443 } else {
2444 iscsit_reject_cmd(cmd,
2445 ISCSI_REASON_DATA_DIGEST_ERROR,
2446 (unsigned char *)hdr);
2447 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2448 }
2449 } else {
2450 pr_debug("Got CRC32C DataDigest 0x%08x for"
2451 " %u bytes of Immediate Data\n", checksum,
2452 length);
2453 }
2454 }
2455
2456 cmd->write_data_done += length;
2457
2458 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2459 spin_lock_bh(&cmd->istate_lock);
2460 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2461 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2462 spin_unlock_bh(&cmd->istate_lock);
2463 }
2464
2465 return IMMEDIATE_DATA_NORMAL_OPERATION;
2466 }
2467
2468 /*
2469 * Called with sess->conn_lock held.
2470 */
2471 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2472 with active network interface */
2473 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2474 {
2475 struct iscsi_cmd *cmd;
2476 struct iscsi_conn *conn_p;
2477
2478 /*
2479 * Only send a Asynchronous Message on connections whos network
2480 * interface is still functional.
2481 */
2482 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2483 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2484 iscsit_inc_conn_usage_count(conn_p);
2485 break;
2486 }
2487 }
2488
2489 if (!conn_p)
2490 return;
2491
2492 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
2493 if (!cmd) {
2494 iscsit_dec_conn_usage_count(conn_p);
2495 return;
2496 }
2497
2498 cmd->logout_cid = conn->cid;
2499 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2500 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2501
2502 spin_lock_bh(&conn_p->cmd_lock);
2503 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2504 spin_unlock_bh(&conn_p->cmd_lock);
2505
2506 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2507 iscsit_dec_conn_usage_count(conn_p);
2508 }
2509
2510 static int iscsit_send_conn_drop_async_message(
2511 struct iscsi_cmd *cmd,
2512 struct iscsi_conn *conn)
2513 {
2514 struct iscsi_async *hdr;
2515
2516 cmd->tx_size = ISCSI_HDR_LEN;
2517 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2518
2519 hdr = (struct iscsi_async *) cmd->pdu;
2520 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2521 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2522 cmd->init_task_tag = RESERVED_ITT;
2523 cmd->targ_xfer_tag = 0xFFFFFFFF;
2524 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2525 cmd->stat_sn = conn->stat_sn++;
2526 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2527 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2528 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2529 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2530 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2531 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2532 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2533
2534 if (conn->conn_ops->HeaderDigest) {
2535 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2536
2537 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2538 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2539
2540 cmd->tx_size += ISCSI_CRC_LEN;
2541 pr_debug("Attaching CRC32C HeaderDigest to"
2542 " Async Message 0x%08x\n", *header_digest);
2543 }
2544
2545 cmd->iov_misc[0].iov_base = cmd->pdu;
2546 cmd->iov_misc[0].iov_len = cmd->tx_size;
2547 cmd->iov_misc_count = 1;
2548
2549 pr_debug("Sending Connection Dropped Async Message StatSN:"
2550 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2551 cmd->logout_cid, conn->cid);
2552 return 0;
2553 }
2554
2555 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2556 {
2557 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2558 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2559 wait_for_completion_interruptible_timeout(
2560 &conn->tx_half_close_comp,
2561 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2562 }
2563 }
2564
2565 static void
2566 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2567 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2568 bool set_statsn)
2569 {
2570 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2571 hdr->flags = datain->flags;
2572 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2573 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2574 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2575 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2576 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2577 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2578 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2579 }
2580 }
2581 hton24(hdr->dlength, datain->length);
2582 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2583 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2584 (struct scsi_lun *)&hdr->lun);
2585 else
2586 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2587
2588 hdr->itt = cmd->init_task_tag;
2589
2590 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2591 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2592 else
2593 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2594 if (set_statsn)
2595 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2596 else
2597 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2598
2599 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2600 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2601 hdr->datasn = cpu_to_be32(datain->data_sn);
2602 hdr->offset = cpu_to_be32(datain->offset);
2603
2604 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2605 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2606 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2607 ntohl(hdr->offset), datain->length, conn->cid);
2608 }
2609
2610 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2611 {
2612 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2613 struct iscsi_datain datain;
2614 struct iscsi_datain_req *dr;
2615 struct kvec *iov;
2616 u32 iov_count = 0, tx_size = 0;
2617 int eodr = 0, ret, iov_ret;
2618 bool set_statsn = false;
2619
2620 memset(&datain, 0, sizeof(struct iscsi_datain));
2621 dr = iscsit_get_datain_values(cmd, &datain);
2622 if (!dr) {
2623 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2624 cmd->init_task_tag);
2625 return -1;
2626 }
2627 /*
2628 * Be paranoid and double check the logic for now.
2629 */
2630 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2631 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2632 " datain.length: %u exceeds cmd->data_length: %u\n",
2633 cmd->init_task_tag, datain.offset, datain.length,
2634 cmd->se_cmd.data_length);
2635 return -1;
2636 }
2637
2638 spin_lock_bh(&conn->sess->session_stats_lock);
2639 conn->sess->tx_data_octets += datain.length;
2640 if (conn->sess->se_sess->se_node_acl) {
2641 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2642 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2643 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2644 }
2645 spin_unlock_bh(&conn->sess->session_stats_lock);
2646 /*
2647 * Special case for successfully execution w/ both DATAIN
2648 * and Sense Data.
2649 */
2650 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2651 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2652 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2653 else {
2654 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2655 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2656 iscsit_increment_maxcmdsn(cmd, conn->sess);
2657 cmd->stat_sn = conn->stat_sn++;
2658 set_statsn = true;
2659 } else if (dr->dr_complete ==
2660 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2661 set_statsn = true;
2662 }
2663
2664 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2665
2666 iov = &cmd->iov_data[0];
2667 iov[iov_count].iov_base = cmd->pdu;
2668 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2669 tx_size += ISCSI_HDR_LEN;
2670
2671 if (conn->conn_ops->HeaderDigest) {
2672 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2673
2674 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2675 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2676
2677 iov[0].iov_len += ISCSI_CRC_LEN;
2678 tx_size += ISCSI_CRC_LEN;
2679
2680 pr_debug("Attaching CRC32 HeaderDigest"
2681 " for DataIN PDU 0x%08x\n", *header_digest);
2682 }
2683
2684 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2685 datain.offset, datain.length);
2686 if (iov_ret < 0)
2687 return -1;
2688
2689 iov_count += iov_ret;
2690 tx_size += datain.length;
2691
2692 cmd->padding = ((-datain.length) & 3);
2693 if (cmd->padding) {
2694 iov[iov_count].iov_base = cmd->pad_bytes;
2695 iov[iov_count++].iov_len = cmd->padding;
2696 tx_size += cmd->padding;
2697
2698 pr_debug("Attaching %u padding bytes\n",
2699 cmd->padding);
2700 }
2701 if (conn->conn_ops->DataDigest) {
2702 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2703 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2704
2705 iov[iov_count].iov_base = &cmd->data_crc;
2706 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2707 tx_size += ISCSI_CRC_LEN;
2708
2709 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2710 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2711 }
2712
2713 cmd->iov_data_count = iov_count;
2714 cmd->tx_size = tx_size;
2715
2716 /* sendpage is preferred but can't insert markers */
2717 if (!conn->conn_ops->IFMarker)
2718 ret = iscsit_fe_sendpage_sg(cmd, conn);
2719 else
2720 ret = iscsit_send_tx_data(cmd, conn, 0);
2721
2722 iscsit_unmap_iovec(cmd);
2723
2724 if (ret < 0) {
2725 iscsit_tx_thread_wait_for_tcp(conn);
2726 return ret;
2727 }
2728
2729 if (dr->dr_complete) {
2730 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2731 2 : 1;
2732 iscsit_free_datain_req(cmd, dr);
2733 }
2734
2735 return eodr;
2736 }
2737
2738 int
2739 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2740 struct iscsi_logout_rsp *hdr)
2741 {
2742 struct iscsi_conn *logout_conn = NULL;
2743 struct iscsi_conn_recovery *cr = NULL;
2744 struct iscsi_session *sess = conn->sess;
2745 /*
2746 * The actual shutting down of Sessions and/or Connections
2747 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2748 * is done in scsi_logout_post_handler().
2749 */
2750 switch (cmd->logout_reason) {
2751 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2752 pr_debug("iSCSI session logout successful, setting"
2753 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2754 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2755 break;
2756 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2757 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2758 break;
2759 /*
2760 * For CLOSECONNECTION logout requests carrying
2761 * a matching logout CID -> local CID, the reference
2762 * for the local CID will have been incremented in
2763 * iscsi_logout_closeconnection().
2764 *
2765 * For CLOSECONNECTION logout requests carrying
2766 * a different CID than the connection it arrived
2767 * on, the connection responding to cmd->logout_cid
2768 * is stopped in iscsit_logout_post_handler_diffcid().
2769 */
2770
2771 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2772 " successful.\n", cmd->logout_cid, conn->cid);
2773 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2774 break;
2775 case ISCSI_LOGOUT_REASON_RECOVERY:
2776 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2777 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2778 break;
2779 /*
2780 * If the connection is still active from our point of view
2781 * force connection recovery to occur.
2782 */
2783 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2784 cmd->logout_cid);
2785 if (logout_conn) {
2786 iscsit_connection_reinstatement_rcfr(logout_conn);
2787 iscsit_dec_conn_usage_count(logout_conn);
2788 }
2789
2790 cr = iscsit_get_inactive_connection_recovery_entry(
2791 conn->sess, cmd->logout_cid);
2792 if (!cr) {
2793 pr_err("Unable to locate CID: %hu for"
2794 " REMOVECONNFORRECOVERY Logout Request.\n",
2795 cmd->logout_cid);
2796 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2797 break;
2798 }
2799
2800 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2801
2802 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2803 " for recovery for CID: %hu on CID: %hu successful.\n",
2804 cmd->logout_cid, conn->cid);
2805 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2806 break;
2807 default:
2808 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2809 cmd->logout_reason);
2810 return -1;
2811 }
2812
2813 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2814 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2815 hdr->response = cmd->logout_response;
2816 hdr->itt = cmd->init_task_tag;
2817 cmd->stat_sn = conn->stat_sn++;
2818 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2819
2820 iscsit_increment_maxcmdsn(cmd, conn->sess);
2821 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2822 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2823
2824 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2825 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2826 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2827 cmd->logout_cid, conn->cid);
2828
2829 return 0;
2830 }
2831 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2832
2833 static int
2834 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2835 {
2836 struct kvec *iov;
2837 int niov = 0, tx_size, rc;
2838
2839 rc = iscsit_build_logout_rsp(cmd, conn,
2840 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2841 if (rc < 0)
2842 return rc;
2843
2844 tx_size = ISCSI_HDR_LEN;
2845 iov = &cmd->iov_misc[0];
2846 iov[niov].iov_base = cmd->pdu;
2847 iov[niov++].iov_len = ISCSI_HDR_LEN;
2848
2849 if (conn->conn_ops->HeaderDigest) {
2850 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2851
2852 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2853 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2854
2855 iov[0].iov_len += ISCSI_CRC_LEN;
2856 tx_size += ISCSI_CRC_LEN;
2857 pr_debug("Attaching CRC32C HeaderDigest to"
2858 " Logout Response 0x%08x\n", *header_digest);
2859 }
2860 cmd->iov_misc_count = niov;
2861 cmd->tx_size = tx_size;
2862
2863 return 0;
2864 }
2865
2866 void
2867 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2868 struct iscsi_nopin *hdr, bool nopout_response)
2869 {
2870 hdr->opcode = ISCSI_OP_NOOP_IN;
2871 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2872 hton24(hdr->dlength, cmd->buf_ptr_size);
2873 if (nopout_response)
2874 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2875 hdr->itt = cmd->init_task_tag;
2876 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2877 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2878 conn->stat_sn;
2879 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2880
2881 if (nopout_response)
2882 iscsit_increment_maxcmdsn(cmd, conn->sess);
2883
2884 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2885 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2886
2887 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2888 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2889 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2890 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2891 }
2892 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2893
2894 /*
2895 * Unsolicited NOPIN, either requesting a response or not.
2896 */
2897 static int iscsit_send_unsolicited_nopin(
2898 struct iscsi_cmd *cmd,
2899 struct iscsi_conn *conn,
2900 int want_response)
2901 {
2902 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2903 int tx_size = ISCSI_HDR_LEN, ret;
2904
2905 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2906
2907 if (conn->conn_ops->HeaderDigest) {
2908 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2909
2910 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2911 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2912
2913 tx_size += ISCSI_CRC_LEN;
2914 pr_debug("Attaching CRC32C HeaderDigest to"
2915 " NopIN 0x%08x\n", *header_digest);
2916 }
2917
2918 cmd->iov_misc[0].iov_base = cmd->pdu;
2919 cmd->iov_misc[0].iov_len = tx_size;
2920 cmd->iov_misc_count = 1;
2921 cmd->tx_size = tx_size;
2922
2923 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2924 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2925
2926 ret = iscsit_send_tx_data(cmd, conn, 1);
2927 if (ret < 0) {
2928 iscsit_tx_thread_wait_for_tcp(conn);
2929 return ret;
2930 }
2931
2932 spin_lock_bh(&cmd->istate_lock);
2933 cmd->i_state = want_response ?
2934 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2935 spin_unlock_bh(&cmd->istate_lock);
2936
2937 return 0;
2938 }
2939
2940 static int
2941 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2942 {
2943 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2944 struct kvec *iov;
2945 u32 padding = 0;
2946 int niov = 0, tx_size;
2947
2948 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2949
2950 tx_size = ISCSI_HDR_LEN;
2951 iov = &cmd->iov_misc[0];
2952 iov[niov].iov_base = cmd->pdu;
2953 iov[niov++].iov_len = ISCSI_HDR_LEN;
2954
2955 if (conn->conn_ops->HeaderDigest) {
2956 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2957
2958 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2959 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2960
2961 iov[0].iov_len += ISCSI_CRC_LEN;
2962 tx_size += ISCSI_CRC_LEN;
2963 pr_debug("Attaching CRC32C HeaderDigest"
2964 " to NopIn 0x%08x\n", *header_digest);
2965 }
2966
2967 /*
2968 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2969 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2970 */
2971 if (cmd->buf_ptr_size) {
2972 iov[niov].iov_base = cmd->buf_ptr;
2973 iov[niov++].iov_len = cmd->buf_ptr_size;
2974 tx_size += cmd->buf_ptr_size;
2975
2976 pr_debug("Echoing back %u bytes of ping"
2977 " data.\n", cmd->buf_ptr_size);
2978
2979 padding = ((-cmd->buf_ptr_size) & 3);
2980 if (padding != 0) {
2981 iov[niov].iov_base = &cmd->pad_bytes;
2982 iov[niov++].iov_len = padding;
2983 tx_size += padding;
2984 pr_debug("Attaching %u additional"
2985 " padding bytes.\n", padding);
2986 }
2987 if (conn->conn_ops->DataDigest) {
2988 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2989 cmd->buf_ptr, cmd->buf_ptr_size,
2990 padding, (u8 *)&cmd->pad_bytes,
2991 (u8 *)&cmd->data_crc);
2992
2993 iov[niov].iov_base = &cmd->data_crc;
2994 iov[niov++].iov_len = ISCSI_CRC_LEN;
2995 tx_size += ISCSI_CRC_LEN;
2996 pr_debug("Attached DataDigest for %u"
2997 " bytes of ping data, CRC 0x%08x\n",
2998 cmd->buf_ptr_size, cmd->data_crc);
2999 }
3000 }
3001
3002 cmd->iov_misc_count = niov;
3003 cmd->tx_size = tx_size;
3004
3005 return 0;
3006 }
3007
3008 static int iscsit_send_r2t(
3009 struct iscsi_cmd *cmd,
3010 struct iscsi_conn *conn)
3011 {
3012 int tx_size = 0;
3013 struct iscsi_r2t *r2t;
3014 struct iscsi_r2t_rsp *hdr;
3015 int ret;
3016
3017 r2t = iscsit_get_r2t_from_list(cmd);
3018 if (!r2t)
3019 return -1;
3020
3021 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3022 memset(hdr, 0, ISCSI_HDR_LEN);
3023 hdr->opcode = ISCSI_OP_R2T;
3024 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3025 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3026 (struct scsi_lun *)&hdr->lun);
3027 hdr->itt = cmd->init_task_tag;
3028 spin_lock_bh(&conn->sess->ttt_lock);
3029 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3030 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3031 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3032 spin_unlock_bh(&conn->sess->ttt_lock);
3033 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3034 hdr->statsn = cpu_to_be32(conn->stat_sn);
3035 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3036 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3037 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3038 hdr->data_offset = cpu_to_be32(r2t->offset);
3039 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3040
3041 cmd->iov_misc[0].iov_base = cmd->pdu;
3042 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3043 tx_size += ISCSI_HDR_LEN;
3044
3045 if (conn->conn_ops->HeaderDigest) {
3046 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3047
3048 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3049 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3050
3051 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3052 tx_size += ISCSI_CRC_LEN;
3053 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3054 " PDU 0x%08x\n", *header_digest);
3055 }
3056
3057 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3058 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3059 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3060 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3061 r2t->offset, r2t->xfer_len, conn->cid);
3062
3063 cmd->iov_misc_count = 1;
3064 cmd->tx_size = tx_size;
3065
3066 spin_lock_bh(&cmd->r2t_lock);
3067 r2t->sent_r2t = 1;
3068 spin_unlock_bh(&cmd->r2t_lock);
3069
3070 ret = iscsit_send_tx_data(cmd, conn, 1);
3071 if (ret < 0) {
3072 iscsit_tx_thread_wait_for_tcp(conn);
3073 return ret;
3074 }
3075
3076 spin_lock_bh(&cmd->dataout_timeout_lock);
3077 iscsit_start_dataout_timer(cmd, conn);
3078 spin_unlock_bh(&cmd->dataout_timeout_lock);
3079
3080 return 0;
3081 }
3082
3083 /*
3084 * @recovery: If called from iscsi_task_reassign_complete_write() for
3085 * connection recovery.
3086 */
3087 int iscsit_build_r2ts_for_cmd(
3088 struct iscsi_conn *conn,
3089 struct iscsi_cmd *cmd,
3090 bool recovery)
3091 {
3092 int first_r2t = 1;
3093 u32 offset = 0, xfer_len = 0;
3094
3095 spin_lock_bh(&cmd->r2t_lock);
3096 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3097 spin_unlock_bh(&cmd->r2t_lock);
3098 return 0;
3099 }
3100
3101 if (conn->sess->sess_ops->DataSequenceInOrder &&
3102 !recovery)
3103 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3104
3105 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3106 if (conn->sess->sess_ops->DataSequenceInOrder) {
3107 offset = cmd->r2t_offset;
3108
3109 if (first_r2t && recovery) {
3110 int new_data_end = offset +
3111 conn->sess->sess_ops->MaxBurstLength -
3112 cmd->next_burst_len;
3113
3114 if (new_data_end > cmd->se_cmd.data_length)
3115 xfer_len = cmd->se_cmd.data_length - offset;
3116 else
3117 xfer_len =
3118 conn->sess->sess_ops->MaxBurstLength -
3119 cmd->next_burst_len;
3120 } else {
3121 int new_data_end = offset +
3122 conn->sess->sess_ops->MaxBurstLength;
3123
3124 if (new_data_end > cmd->se_cmd.data_length)
3125 xfer_len = cmd->se_cmd.data_length - offset;
3126 else
3127 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3128 }
3129 cmd->r2t_offset += xfer_len;
3130
3131 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3132 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3133 } else {
3134 struct iscsi_seq *seq;
3135
3136 seq = iscsit_get_seq_holder_for_r2t(cmd);
3137 if (!seq) {
3138 spin_unlock_bh(&cmd->r2t_lock);
3139 return -1;
3140 }
3141
3142 offset = seq->offset;
3143 xfer_len = seq->xfer_len;
3144
3145 if (cmd->seq_send_order == cmd->seq_count)
3146 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3147 }
3148 cmd->outstanding_r2ts++;
3149 first_r2t = 0;
3150
3151 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3152 spin_unlock_bh(&cmd->r2t_lock);
3153 return -1;
3154 }
3155
3156 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3157 break;
3158 }
3159 spin_unlock_bh(&cmd->r2t_lock);
3160
3161 return 0;
3162 }
3163
3164 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3165 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3166 {
3167 if (inc_stat_sn)
3168 cmd->stat_sn = conn->stat_sn++;
3169
3170 spin_lock_bh(&conn->sess->session_stats_lock);
3171 conn->sess->rsp_pdus++;
3172 spin_unlock_bh(&conn->sess->session_stats_lock);
3173
3174 memset(hdr, 0, ISCSI_HDR_LEN);
3175 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3176 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3177 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3178 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3179 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3180 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3181 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3182 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3183 }
3184 hdr->response = cmd->iscsi_response;
3185 hdr->cmd_status = cmd->se_cmd.scsi_status;
3186 hdr->itt = cmd->init_task_tag;
3187 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3188
3189 iscsit_increment_maxcmdsn(cmd, conn->sess);
3190 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3191 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3192
3193 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3194 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3195 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3196 cmd->se_cmd.scsi_status, conn->cid);
3197 }
3198 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3199
3200 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3201 {
3202 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3203 struct kvec *iov;
3204 u32 padding = 0, tx_size = 0;
3205 int iov_count = 0;
3206 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3207
3208 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3209
3210 iov = &cmd->iov_misc[0];
3211 iov[iov_count].iov_base = cmd->pdu;
3212 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3213 tx_size += ISCSI_HDR_LEN;
3214
3215 /*
3216 * Attach SENSE DATA payload to iSCSI Response PDU
3217 */
3218 if (cmd->se_cmd.sense_buffer &&
3219 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3220 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3221 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3222 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3223
3224 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3225 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3226 iov[iov_count].iov_base = cmd->sense_buffer;
3227 iov[iov_count++].iov_len =
3228 (cmd->se_cmd.scsi_sense_length + padding);
3229 tx_size += cmd->se_cmd.scsi_sense_length;
3230
3231 if (padding) {
3232 memset(cmd->sense_buffer +
3233 cmd->se_cmd.scsi_sense_length, 0, padding);
3234 tx_size += padding;
3235 pr_debug("Adding %u bytes of padding to"
3236 " SENSE.\n", padding);
3237 }
3238
3239 if (conn->conn_ops->DataDigest) {
3240 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3241 cmd->sense_buffer,
3242 (cmd->se_cmd.scsi_sense_length + padding),
3243 0, NULL, (u8 *)&cmd->data_crc);
3244
3245 iov[iov_count].iov_base = &cmd->data_crc;
3246 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3247 tx_size += ISCSI_CRC_LEN;
3248
3249 pr_debug("Attaching CRC32 DataDigest for"
3250 " SENSE, %u bytes CRC 0x%08x\n",
3251 (cmd->se_cmd.scsi_sense_length + padding),
3252 cmd->data_crc);
3253 }
3254
3255 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3256 " Response PDU\n",
3257 cmd->se_cmd.scsi_sense_length);
3258 }
3259
3260 if (conn->conn_ops->HeaderDigest) {
3261 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3262
3263 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3264 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3265
3266 iov[0].iov_len += ISCSI_CRC_LEN;
3267 tx_size += ISCSI_CRC_LEN;
3268 pr_debug("Attaching CRC32 HeaderDigest for Response"
3269 " PDU 0x%08x\n", *header_digest);
3270 }
3271
3272 cmd->iov_misc_count = iov_count;
3273 cmd->tx_size = tx_size;
3274
3275 return 0;
3276 }
3277
3278 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3279 {
3280 switch (se_tmr->response) {
3281 case TMR_FUNCTION_COMPLETE:
3282 return ISCSI_TMF_RSP_COMPLETE;
3283 case TMR_TASK_DOES_NOT_EXIST:
3284 return ISCSI_TMF_RSP_NO_TASK;
3285 case TMR_LUN_DOES_NOT_EXIST:
3286 return ISCSI_TMF_RSP_NO_LUN;
3287 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3288 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3289 case TMR_FUNCTION_REJECTED:
3290 default:
3291 return ISCSI_TMF_RSP_REJECTED;
3292 }
3293 }
3294
3295 void
3296 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3297 struct iscsi_tm_rsp *hdr)
3298 {
3299 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3300
3301 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3302 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3303 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3304 hdr->itt = cmd->init_task_tag;
3305 cmd->stat_sn = conn->stat_sn++;
3306 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3307
3308 iscsit_increment_maxcmdsn(cmd, conn->sess);
3309 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3310 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3311
3312 pr_debug("Built Task Management Response ITT: 0x%08x,"
3313 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3314 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3315 }
3316 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3317
3318 static int
3319 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3320 {
3321 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3322 u32 tx_size = 0;
3323
3324 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3325
3326 cmd->iov_misc[0].iov_base = cmd->pdu;
3327 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3328 tx_size += ISCSI_HDR_LEN;
3329
3330 if (conn->conn_ops->HeaderDigest) {
3331 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3332
3333 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3334 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3335
3336 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3337 tx_size += ISCSI_CRC_LEN;
3338 pr_debug("Attaching CRC32 HeaderDigest for Task"
3339 " Mgmt Response PDU 0x%08x\n", *header_digest);
3340 }
3341
3342 cmd->iov_misc_count = 1;
3343 cmd->tx_size = tx_size;
3344
3345 return 0;
3346 }
3347
3348 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3349 {
3350 bool ret = false;
3351
3352 if (np->np_sockaddr.ss_family == AF_INET6) {
3353 const struct sockaddr_in6 sin6 = {
3354 .sin6_addr = IN6ADDR_ANY_INIT };
3355 struct sockaddr_in6 *sock_in6 =
3356 (struct sockaddr_in6 *)&np->np_sockaddr;
3357
3358 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3359 sin6.sin6_addr.s6_addr, 16))
3360 ret = true;
3361 } else {
3362 struct sockaddr_in * sock_in =
3363 (struct sockaddr_in *)&np->np_sockaddr;
3364
3365 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3366 ret = true;
3367 }
3368
3369 return ret;
3370 }
3371
3372 #define SENDTARGETS_BUF_LIMIT 32768U
3373
3374 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3375 {
3376 char *payload = NULL;
3377 struct iscsi_conn *conn = cmd->conn;
3378 struct iscsi_portal_group *tpg;
3379 struct iscsi_tiqn *tiqn;
3380 struct iscsi_tpg_np *tpg_np;
3381 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3382 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3383 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3384
3385 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3386 SENDTARGETS_BUF_LIMIT);
3387
3388 payload = kzalloc(buffer_len, GFP_KERNEL);
3389 if (!payload) {
3390 pr_err("Unable to allocate memory for sendtargets"
3391 " response.\n");
3392 return -ENOMEM;
3393 }
3394 /*
3395 * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
3396 * explicit case..
3397 */
3398 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
3399 text_ptr = strchr(text_in, '=');
3400 if (!text_ptr) {
3401 pr_err("Unable to locate '=' string in text_in:"
3402 " %s\n", text_in);
3403 kfree(payload);
3404 return -EINVAL;
3405 }
3406 /*
3407 * Skip over '=' character..
3408 */
3409 text_ptr += 1;
3410 }
3411
3412 spin_lock(&tiqn_lock);
3413 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3414 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
3415 strcmp(tiqn->tiqn, text_ptr)) {
3416 continue;
3417 }
3418
3419 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3420 len += 1;
3421
3422 if ((len + payload_len) > buffer_len) {
3423 end_of_buf = 1;
3424 goto eob;
3425 }
3426 memcpy(payload + payload_len, buf, len);
3427 payload_len += len;
3428
3429 spin_lock(&tiqn->tiqn_tpg_lock);
3430 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3431
3432 spin_lock(&tpg->tpg_state_lock);
3433 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3434 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3435 spin_unlock(&tpg->tpg_state_lock);
3436 continue;
3437 }
3438 spin_unlock(&tpg->tpg_state_lock);
3439
3440 spin_lock(&tpg->tpg_np_lock);
3441 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3442 tpg_np_list) {
3443 struct iscsi_np *np = tpg_np->tpg_np;
3444 bool inaddr_any = iscsit_check_inaddr_any(np);
3445
3446 len = sprintf(buf, "TargetAddress="
3447 "%s%s%s:%hu,%hu",
3448 (np->np_sockaddr.ss_family == AF_INET6) ?
3449 "[" : "", (inaddr_any == false) ?
3450 np->np_ip : conn->local_ip,
3451 (np->np_sockaddr.ss_family == AF_INET6) ?
3452 "]" : "", (inaddr_any == false) ?
3453 np->np_port : conn->local_port,
3454 tpg->tpgt);
3455 len += 1;
3456
3457 if ((len + payload_len) > buffer_len) {
3458 spin_unlock(&tpg->tpg_np_lock);
3459 spin_unlock(&tiqn->tiqn_tpg_lock);
3460 end_of_buf = 1;
3461 goto eob;
3462 }
3463 memcpy(payload + payload_len, buf, len);
3464 payload_len += len;
3465 }
3466 spin_unlock(&tpg->tpg_np_lock);
3467 }
3468 spin_unlock(&tiqn->tiqn_tpg_lock);
3469 eob:
3470 if (end_of_buf)
3471 break;
3472
3473 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
3474 break;
3475 }
3476 spin_unlock(&tiqn_lock);
3477
3478 cmd->buf_ptr = payload;
3479
3480 return payload_len;
3481 }
3482
3483 int
3484 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3485 struct iscsi_text_rsp *hdr)
3486 {
3487 int text_length, padding;
3488
3489 text_length = iscsit_build_sendtargets_response(cmd);
3490 if (text_length < 0)
3491 return text_length;
3492
3493 hdr->opcode = ISCSI_OP_TEXT_RSP;
3494 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3495 padding = ((-text_length) & 3);
3496 hton24(hdr->dlength, text_length);
3497 hdr->itt = cmd->init_task_tag;
3498 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3499 cmd->stat_sn = conn->stat_sn++;
3500 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3501
3502 iscsit_increment_maxcmdsn(cmd, conn->sess);
3503 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3504 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3505
3506 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3507 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3508 text_length, conn->cid);
3509
3510 return text_length + padding;
3511 }
3512 EXPORT_SYMBOL(iscsit_build_text_rsp);
3513
3514 /*
3515 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3516 * MaxRecvDataSegmentLength.
3517 */
3518 static int iscsit_send_text_rsp(
3519 struct iscsi_cmd *cmd,
3520 struct iscsi_conn *conn)
3521 {
3522 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3523 struct kvec *iov;
3524 u32 tx_size = 0;
3525 int text_length, iov_count = 0, rc;
3526
3527 rc = iscsit_build_text_rsp(cmd, conn, hdr);
3528 if (rc < 0)
3529 return rc;
3530
3531 text_length = rc;
3532 iov = &cmd->iov_misc[0];
3533 iov[iov_count].iov_base = cmd->pdu;
3534 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3535 iov[iov_count].iov_base = cmd->buf_ptr;
3536 iov[iov_count++].iov_len = text_length;
3537
3538 tx_size += (ISCSI_HDR_LEN + text_length);
3539
3540 if (conn->conn_ops->HeaderDigest) {
3541 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3542
3543 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3544 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3545
3546 iov[0].iov_len += ISCSI_CRC_LEN;
3547 tx_size += ISCSI_CRC_LEN;
3548 pr_debug("Attaching CRC32 HeaderDigest for"
3549 " Text Response PDU 0x%08x\n", *header_digest);
3550 }
3551
3552 if (conn->conn_ops->DataDigest) {
3553 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3554 cmd->buf_ptr, text_length,
3555 0, NULL, (u8 *)&cmd->data_crc);
3556
3557 iov[iov_count].iov_base = &cmd->data_crc;
3558 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3559 tx_size += ISCSI_CRC_LEN;
3560
3561 pr_debug("Attaching DataDigest for %u bytes of text"
3562 " data, CRC 0x%08x\n", text_length,
3563 cmd->data_crc);
3564 }
3565
3566 cmd->iov_misc_count = iov_count;
3567 cmd->tx_size = tx_size;
3568
3569 return 0;
3570 }
3571
3572 void
3573 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3574 struct iscsi_reject *hdr)
3575 {
3576 hdr->opcode = ISCSI_OP_REJECT;
3577 hdr->reason = cmd->reject_reason;
3578 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3579 hton24(hdr->dlength, ISCSI_HDR_LEN);
3580 hdr->ffffffff = cpu_to_be32(0xffffffff);
3581 cmd->stat_sn = conn->stat_sn++;
3582 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3583 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3584 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3585
3586 }
3587 EXPORT_SYMBOL(iscsit_build_reject);
3588
3589 static int iscsit_send_reject(
3590 struct iscsi_cmd *cmd,
3591 struct iscsi_conn *conn)
3592 {
3593 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3594 struct kvec *iov;
3595 u32 iov_count = 0, tx_size;
3596
3597 iscsit_build_reject(cmd, conn, hdr);
3598
3599 iov = &cmd->iov_misc[0];
3600 iov[iov_count].iov_base = cmd->pdu;
3601 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3602 iov[iov_count].iov_base = cmd->buf_ptr;
3603 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3604
3605 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3606
3607 if (conn->conn_ops->HeaderDigest) {
3608 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3609
3610 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3611 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3612
3613 iov[0].iov_len += ISCSI_CRC_LEN;
3614 tx_size += ISCSI_CRC_LEN;
3615 pr_debug("Attaching CRC32 HeaderDigest for"
3616 " REJECT PDU 0x%08x\n", *header_digest);
3617 }
3618
3619 if (conn->conn_ops->DataDigest) {
3620 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3621 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3622
3623 iov[iov_count].iov_base = &cmd->data_crc;
3624 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3625 tx_size += ISCSI_CRC_LEN;
3626 pr_debug("Attaching CRC32 DataDigest for REJECT"
3627 " PDU 0x%08x\n", cmd->data_crc);
3628 }
3629
3630 cmd->iov_misc_count = iov_count;
3631 cmd->tx_size = tx_size;
3632
3633 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3634 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3635
3636 return 0;
3637 }
3638
3639 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3640 {
3641 struct iscsi_thread_set *ts = conn->thread_set;
3642 int ord, cpu;
3643 /*
3644 * thread_id is assigned from iscsit_global->ts_bitmap from
3645 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3646 *
3647 * Here we use thread_id to determine which CPU that this
3648 * iSCSI connection's iscsi_thread_set will be scheduled to
3649 * execute upon.
3650 */
3651 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3652 for_each_online_cpu(cpu) {
3653 if (ord-- == 0) {
3654 cpumask_set_cpu(cpu, conn->conn_cpumask);
3655 return;
3656 }
3657 }
3658 /*
3659 * This should never be reached..
3660 */
3661 dump_stack();
3662 cpumask_setall(conn->conn_cpumask);
3663 }
3664
3665 static inline void iscsit_thread_check_cpumask(
3666 struct iscsi_conn *conn,
3667 struct task_struct *p,
3668 int mode)
3669 {
3670 char buf[128];
3671 /*
3672 * mode == 1 signals iscsi_target_tx_thread() usage.
3673 * mode == 0 signals iscsi_target_rx_thread() usage.
3674 */
3675 if (mode == 1) {
3676 if (!conn->conn_tx_reset_cpumask)
3677 return;
3678 conn->conn_tx_reset_cpumask = 0;
3679 } else {
3680 if (!conn->conn_rx_reset_cpumask)
3681 return;
3682 conn->conn_rx_reset_cpumask = 0;
3683 }
3684 /*
3685 * Update the CPU mask for this single kthread so that
3686 * both TX and RX kthreads are scheduled to run on the
3687 * same CPU.
3688 */
3689 memset(buf, 0, 128);
3690 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3691 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3692 }
3693
3694 static int
3695 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3696 {
3697 int ret;
3698
3699 switch (state) {
3700 case ISTATE_SEND_R2T:
3701 ret = iscsit_send_r2t(cmd, conn);
3702 if (ret < 0)
3703 goto err;
3704 break;
3705 case ISTATE_REMOVE:
3706 spin_lock_bh(&conn->cmd_lock);
3707 list_del(&cmd->i_conn_node);
3708 spin_unlock_bh(&conn->cmd_lock);
3709
3710 iscsit_free_cmd(cmd, false);
3711 break;
3712 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3713 iscsit_mod_nopin_response_timer(conn);
3714 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3715 if (ret < 0)
3716 goto err;
3717 break;
3718 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3719 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3720 if (ret < 0)
3721 goto err;
3722 break;
3723 default:
3724 pr_err("Unknown Opcode: 0x%02x ITT:"
3725 " 0x%08x, i_state: %d on CID: %hu\n",
3726 cmd->iscsi_opcode, cmd->init_task_tag, state,
3727 conn->cid);
3728 goto err;
3729 }
3730
3731 return 0;
3732
3733 err:
3734 return -1;
3735 }
3736
3737 static int
3738 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3739 {
3740 struct iscsit_transport *t = conn->conn_transport;
3741 struct iscsi_queue_req *qr;
3742 struct iscsi_cmd *cmd;
3743 u8 state;
3744 int ret;
3745
3746 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3747 atomic_set(&conn->check_immediate_queue, 0);
3748 cmd = qr->cmd;
3749 state = qr->state;
3750 kmem_cache_free(lio_qr_cache, qr);
3751
3752 ret = t->iscsit_immediate_queue(conn, cmd, state);
3753 if (ret < 0)
3754 return ret;
3755 }
3756
3757 return 0;
3758 }
3759
3760 static int
3761 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3762 {
3763 int ret;
3764
3765 check_rsp_state:
3766 switch (state) {
3767 case ISTATE_SEND_DATAIN:
3768 ret = iscsit_send_datain(cmd, conn);
3769 if (ret < 0)
3770 goto err;
3771 else if (!ret)
3772 /* more drs */
3773 goto check_rsp_state;
3774 else if (ret == 1) {
3775 /* all done */
3776 spin_lock_bh(&cmd->istate_lock);
3777 cmd->i_state = ISTATE_SENT_STATUS;
3778 spin_unlock_bh(&cmd->istate_lock);
3779
3780 if (atomic_read(&conn->check_immediate_queue))
3781 return 1;
3782
3783 return 0;
3784 } else if (ret == 2) {
3785 /* Still must send status,
3786 SCF_TRANSPORT_TASK_SENSE was set */
3787 spin_lock_bh(&cmd->istate_lock);
3788 cmd->i_state = ISTATE_SEND_STATUS;
3789 spin_unlock_bh(&cmd->istate_lock);
3790 state = ISTATE_SEND_STATUS;
3791 goto check_rsp_state;
3792 }
3793
3794 break;
3795 case ISTATE_SEND_STATUS:
3796 case ISTATE_SEND_STATUS_RECOVERY:
3797 ret = iscsit_send_response(cmd, conn);
3798 break;
3799 case ISTATE_SEND_LOGOUTRSP:
3800 ret = iscsit_send_logout(cmd, conn);
3801 break;
3802 case ISTATE_SEND_ASYNCMSG:
3803 ret = iscsit_send_conn_drop_async_message(
3804 cmd, conn);
3805 break;
3806 case ISTATE_SEND_NOPIN:
3807 ret = iscsit_send_nopin(cmd, conn);
3808 break;
3809 case ISTATE_SEND_REJECT:
3810 ret = iscsit_send_reject(cmd, conn);
3811 break;
3812 case ISTATE_SEND_TASKMGTRSP:
3813 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3814 if (ret != 0)
3815 break;
3816 ret = iscsit_tmr_post_handler(cmd, conn);
3817 if (ret != 0)
3818 iscsit_fall_back_to_erl0(conn->sess);
3819 break;
3820 case ISTATE_SEND_TEXTRSP:
3821 ret = iscsit_send_text_rsp(cmd, conn);
3822 break;
3823 default:
3824 pr_err("Unknown Opcode: 0x%02x ITT:"
3825 " 0x%08x, i_state: %d on CID: %hu\n",
3826 cmd->iscsi_opcode, cmd->init_task_tag,
3827 state, conn->cid);
3828 goto err;
3829 }
3830 if (ret < 0)
3831 goto err;
3832
3833 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3834 iscsit_tx_thread_wait_for_tcp(conn);
3835 iscsit_unmap_iovec(cmd);
3836 goto err;
3837 }
3838 iscsit_unmap_iovec(cmd);
3839
3840 switch (state) {
3841 case ISTATE_SEND_LOGOUTRSP:
3842 if (!iscsit_logout_post_handler(cmd, conn))
3843 goto restart;
3844 /* fall through */
3845 case ISTATE_SEND_STATUS:
3846 case ISTATE_SEND_ASYNCMSG:
3847 case ISTATE_SEND_NOPIN:
3848 case ISTATE_SEND_STATUS_RECOVERY:
3849 case ISTATE_SEND_TEXTRSP:
3850 case ISTATE_SEND_TASKMGTRSP:
3851 case ISTATE_SEND_REJECT:
3852 spin_lock_bh(&cmd->istate_lock);
3853 cmd->i_state = ISTATE_SENT_STATUS;
3854 spin_unlock_bh(&cmd->istate_lock);
3855 break;
3856 default:
3857 pr_err("Unknown Opcode: 0x%02x ITT:"
3858 " 0x%08x, i_state: %d on CID: %hu\n",
3859 cmd->iscsi_opcode, cmd->init_task_tag,
3860 cmd->i_state, conn->cid);
3861 goto err;
3862 }
3863
3864 if (atomic_read(&conn->check_immediate_queue))
3865 return 1;
3866
3867 return 0;
3868
3869 err:
3870 return -1;
3871 restart:
3872 return -EAGAIN;
3873 }
3874
3875 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3876 {
3877 struct iscsit_transport *t = conn->conn_transport;
3878 struct iscsi_queue_req *qr;
3879 struct iscsi_cmd *cmd;
3880 u8 state;
3881 int ret;
3882
3883 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3884 cmd = qr->cmd;
3885 state = qr->state;
3886 kmem_cache_free(lio_qr_cache, qr);
3887
3888 ret = t->iscsit_response_queue(conn, cmd, state);
3889 if (ret == 1 || ret < 0)
3890 return ret;
3891 }
3892
3893 return 0;
3894 }
3895
3896 int iscsi_target_tx_thread(void *arg)
3897 {
3898 int ret = 0;
3899 struct iscsi_conn *conn;
3900 struct iscsi_thread_set *ts = arg;
3901 /*
3902 * Allow ourselves to be interrupted by SIGINT so that a
3903 * connection recovery / failure event can be triggered externally.
3904 */
3905 allow_signal(SIGINT);
3906
3907 restart:
3908 conn = iscsi_tx_thread_pre_handler(ts);
3909 if (!conn)
3910 goto out;
3911
3912 ret = 0;
3913
3914 while (!kthread_should_stop()) {
3915 /*
3916 * Ensure that both TX and RX per connection kthreads
3917 * are scheduled to run on the same CPU.
3918 */
3919 iscsit_thread_check_cpumask(conn, current, 1);
3920
3921 wait_event_interruptible(conn->queues_wq,
3922 !iscsit_conn_all_queues_empty(conn) ||
3923 ts->status == ISCSI_THREAD_SET_RESET);
3924
3925 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3926 signal_pending(current))
3927 goto transport_err;
3928
3929 get_immediate:
3930 ret = iscsit_handle_immediate_queue(conn);
3931 if (ret < 0)
3932 goto transport_err;
3933
3934 ret = iscsit_handle_response_queue(conn);
3935 if (ret == 1)
3936 goto get_immediate;
3937 else if (ret == -EAGAIN)
3938 goto restart;
3939 else if (ret < 0)
3940 goto transport_err;
3941 }
3942
3943 transport_err:
3944 iscsit_take_action_for_connection_exit(conn);
3945 goto restart;
3946 out:
3947 return 0;
3948 }
3949
3950 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3951 {
3952 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3953 struct iscsi_cmd *cmd;
3954 int ret = 0;
3955
3956 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3957 case ISCSI_OP_SCSI_CMD:
3958 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3959 if (!cmd)
3960 goto reject;
3961
3962 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3963 break;
3964 case ISCSI_OP_SCSI_DATA_OUT:
3965 ret = iscsit_handle_data_out(conn, buf);
3966 break;
3967 case ISCSI_OP_NOOP_OUT:
3968 cmd = NULL;
3969 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3970 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3971 if (!cmd)
3972 goto reject;
3973 }
3974 ret = iscsit_handle_nop_out(conn, cmd, buf);
3975 break;
3976 case ISCSI_OP_SCSI_TMFUNC:
3977 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3978 if (!cmd)
3979 goto reject;
3980
3981 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3982 break;
3983 case ISCSI_OP_TEXT:
3984 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3985 if (!cmd)
3986 goto reject;
3987
3988 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3989 break;
3990 case ISCSI_OP_LOGOUT:
3991 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3992 if (!cmd)
3993 goto reject;
3994
3995 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3996 if (ret > 0)
3997 wait_for_completion_timeout(&conn->conn_logout_comp,
3998 SECONDS_FOR_LOGOUT_COMP * HZ);
3999 break;
4000 case ISCSI_OP_SNACK:
4001 ret = iscsit_handle_snack(conn, buf);
4002 break;
4003 default:
4004 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4005 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4006 pr_err("Cannot recover from unknown"
4007 " opcode while ERL=0, closing iSCSI connection.\n");
4008 return -1;
4009 }
4010 if (!conn->conn_ops->OFMarker) {
4011 pr_err("Unable to recover from unknown"
4012 " opcode while OFMarker=No, closing iSCSI"
4013 " connection.\n");
4014 return -1;
4015 }
4016 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4017 pr_err("Unable to recover from unknown"
4018 " opcode, closing iSCSI connection.\n");
4019 return -1;
4020 }
4021 break;
4022 }
4023
4024 return ret;
4025 reject:
4026 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4027 }
4028
4029 int iscsi_target_rx_thread(void *arg)
4030 {
4031 int ret;
4032 u8 buffer[ISCSI_HDR_LEN], opcode;
4033 u32 checksum = 0, digest = 0;
4034 struct iscsi_conn *conn = NULL;
4035 struct iscsi_thread_set *ts = arg;
4036 struct kvec iov;
4037 /*
4038 * Allow ourselves to be interrupted by SIGINT so that a
4039 * connection recovery / failure event can be triggered externally.
4040 */
4041 allow_signal(SIGINT);
4042
4043 restart:
4044 conn = iscsi_rx_thread_pre_handler(ts);
4045 if (!conn)
4046 goto out;
4047
4048 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4049 struct completion comp;
4050 int rc;
4051
4052 init_completion(&comp);
4053 rc = wait_for_completion_interruptible(&comp);
4054 if (rc < 0)
4055 goto transport_err;
4056
4057 goto out;
4058 }
4059
4060 while (!kthread_should_stop()) {
4061 /*
4062 * Ensure that both TX and RX per connection kthreads
4063 * are scheduled to run on the same CPU.
4064 */
4065 iscsit_thread_check_cpumask(conn, current, 0);
4066
4067 memset(buffer, 0, ISCSI_HDR_LEN);
4068 memset(&iov, 0, sizeof(struct kvec));
4069
4070 iov.iov_base = buffer;
4071 iov.iov_len = ISCSI_HDR_LEN;
4072
4073 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4074 if (ret != ISCSI_HDR_LEN) {
4075 iscsit_rx_thread_wait_for_tcp(conn);
4076 goto transport_err;
4077 }
4078
4079 if (conn->conn_ops->HeaderDigest) {
4080 iov.iov_base = &digest;
4081 iov.iov_len = ISCSI_CRC_LEN;
4082
4083 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4084 if (ret != ISCSI_CRC_LEN) {
4085 iscsit_rx_thread_wait_for_tcp(conn);
4086 goto transport_err;
4087 }
4088
4089 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4090 buffer, ISCSI_HDR_LEN,
4091 0, NULL, (u8 *)&checksum);
4092
4093 if (digest != checksum) {
4094 pr_err("HeaderDigest CRC32C failed,"
4095 " received 0x%08x, computed 0x%08x\n",
4096 digest, checksum);
4097 /*
4098 * Set the PDU to 0xff so it will intentionally
4099 * hit default in the switch below.
4100 */
4101 memset(buffer, 0xff, ISCSI_HDR_LEN);
4102 spin_lock_bh(&conn->sess->session_stats_lock);
4103 conn->sess->conn_digest_errors++;
4104 spin_unlock_bh(&conn->sess->session_stats_lock);
4105 } else {
4106 pr_debug("Got HeaderDigest CRC32C"
4107 " 0x%08x\n", checksum);
4108 }
4109 }
4110
4111 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4112 goto transport_err;
4113
4114 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4115
4116 if (conn->sess->sess_ops->SessionType &&
4117 ((!(opcode & ISCSI_OP_TEXT)) ||
4118 (!(opcode & ISCSI_OP_LOGOUT)))) {
4119 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4120 " while in Discovery Session, rejecting.\n", opcode);
4121 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4122 buffer);
4123 goto transport_err;
4124 }
4125
4126 ret = iscsi_target_rx_opcode(conn, buffer);
4127 if (ret < 0)
4128 goto transport_err;
4129 }
4130
4131 transport_err:
4132 if (!signal_pending(current))
4133 atomic_set(&conn->transport_failed, 1);
4134 iscsit_take_action_for_connection_exit(conn);
4135 goto restart;
4136 out:
4137 return 0;
4138 }
4139
4140 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4141 {
4142 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4143 struct iscsi_session *sess = conn->sess;
4144 /*
4145 * We expect this function to only ever be called from either RX or TX
4146 * thread context via iscsit_close_connection() once the other context
4147 * has been reset -> returned sleeping pre-handler state.
4148 */
4149 spin_lock_bh(&conn->cmd_lock);
4150 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4151
4152 list_del(&cmd->i_conn_node);
4153 spin_unlock_bh(&conn->cmd_lock);
4154
4155 iscsit_increment_maxcmdsn(cmd, sess);
4156
4157 iscsit_free_cmd(cmd, true);
4158
4159 spin_lock_bh(&conn->cmd_lock);
4160 }
4161 spin_unlock_bh(&conn->cmd_lock);
4162 }
4163
4164 static void iscsit_stop_timers_for_cmds(
4165 struct iscsi_conn *conn)
4166 {
4167 struct iscsi_cmd *cmd;
4168
4169 spin_lock_bh(&conn->cmd_lock);
4170 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4171 if (cmd->data_direction == DMA_TO_DEVICE)
4172 iscsit_stop_dataout_timer(cmd);
4173 }
4174 spin_unlock_bh(&conn->cmd_lock);
4175 }
4176
4177 int iscsit_close_connection(
4178 struct iscsi_conn *conn)
4179 {
4180 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4181 struct iscsi_session *sess = conn->sess;
4182
4183 pr_debug("Closing iSCSI connection CID %hu on SID:"
4184 " %u\n", conn->cid, sess->sid);
4185 /*
4186 * Always up conn_logout_comp just in case the RX Thread is sleeping
4187 * and the logout response never got sent because the connection
4188 * failed.
4189 */
4190 complete(&conn->conn_logout_comp);
4191
4192 iscsi_release_thread_set(conn);
4193
4194 iscsit_stop_timers_for_cmds(conn);
4195 iscsit_stop_nopin_response_timer(conn);
4196 iscsit_stop_nopin_timer(conn);
4197 iscsit_free_queue_reqs_for_conn(conn);
4198
4199 /*
4200 * During Connection recovery drop unacknowledged out of order
4201 * commands for this connection, and prepare the other commands
4202 * for realligence.
4203 *
4204 * During normal operation clear the out of order commands (but
4205 * do not free the struct iscsi_ooo_cmdsn's) and release all
4206 * struct iscsi_cmds.
4207 */
4208 if (atomic_read(&conn->connection_recovery)) {
4209 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4210 iscsit_prepare_cmds_for_realligance(conn);
4211 } else {
4212 iscsit_clear_ooo_cmdsns_for_conn(conn);
4213 iscsit_release_commands_from_conn(conn);
4214 }
4215
4216 /*
4217 * Handle decrementing session or connection usage count if
4218 * a logout response was not able to be sent because the
4219 * connection failed. Fall back to Session Recovery here.
4220 */
4221 if (atomic_read(&conn->conn_logout_remove)) {
4222 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4223 iscsit_dec_conn_usage_count(conn);
4224 iscsit_dec_session_usage_count(sess);
4225 }
4226 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4227 iscsit_dec_conn_usage_count(conn);
4228
4229 atomic_set(&conn->conn_logout_remove, 0);
4230 atomic_set(&sess->session_reinstatement, 0);
4231 atomic_set(&sess->session_fall_back_to_erl0, 1);
4232 }
4233
4234 spin_lock_bh(&sess->conn_lock);
4235 list_del(&conn->conn_list);
4236
4237 /*
4238 * Attempt to let the Initiator know this connection failed by
4239 * sending an Connection Dropped Async Message on another
4240 * active connection.
4241 */
4242 if (atomic_read(&conn->connection_recovery))
4243 iscsit_build_conn_drop_async_message(conn);
4244
4245 spin_unlock_bh(&sess->conn_lock);
4246
4247 /*
4248 * If connection reinstatement is being performed on this connection,
4249 * up the connection reinstatement semaphore that is being blocked on
4250 * in iscsit_cause_connection_reinstatement().
4251 */
4252 spin_lock_bh(&conn->state_lock);
4253 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4254 spin_unlock_bh(&conn->state_lock);
4255 complete(&conn->conn_wait_comp);
4256 wait_for_completion(&conn->conn_post_wait_comp);
4257 spin_lock_bh(&conn->state_lock);
4258 }
4259
4260 /*
4261 * If connection reinstatement is being performed on this connection
4262 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4263 * connection wait rcfr semaphore that is being blocked on
4264 * an iscsit_connection_reinstatement_rcfr().
4265 */
4266 if (atomic_read(&conn->connection_wait_rcfr)) {
4267 spin_unlock_bh(&conn->state_lock);
4268 complete(&conn->conn_wait_rcfr_comp);
4269 wait_for_completion(&conn->conn_post_wait_comp);
4270 spin_lock_bh(&conn->state_lock);
4271 }
4272 atomic_set(&conn->connection_reinstatement, 1);
4273 spin_unlock_bh(&conn->state_lock);
4274
4275 /*
4276 * If any other processes are accessing this connection pointer we
4277 * must wait until they have completed.
4278 */
4279 iscsit_check_conn_usage_count(conn);
4280
4281 if (conn->conn_rx_hash.tfm)
4282 crypto_free_hash(conn->conn_rx_hash.tfm);
4283 if (conn->conn_tx_hash.tfm)
4284 crypto_free_hash(conn->conn_tx_hash.tfm);
4285
4286 if (conn->conn_cpumask)
4287 free_cpumask_var(conn->conn_cpumask);
4288
4289 kfree(conn->conn_ops);
4290 conn->conn_ops = NULL;
4291
4292 if (conn->sock)
4293 sock_release(conn->sock);
4294
4295 if (conn->conn_transport->iscsit_free_conn)
4296 conn->conn_transport->iscsit_free_conn(conn);
4297
4298 iscsit_put_transport(conn->conn_transport);
4299
4300 conn->thread_set = NULL;
4301
4302 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4303 conn->conn_state = TARG_CONN_STATE_FREE;
4304 kfree(conn);
4305
4306 spin_lock_bh(&sess->conn_lock);
4307 atomic_dec(&sess->nconn);
4308 pr_debug("Decremented iSCSI connection count to %hu from node:"
4309 " %s\n", atomic_read(&sess->nconn),
4310 sess->sess_ops->InitiatorName);
4311 /*
4312 * Make sure that if one connection fails in an non ERL=2 iSCSI
4313 * Session that they all fail.
4314 */
4315 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4316 !atomic_read(&sess->session_logout))
4317 atomic_set(&sess->session_fall_back_to_erl0, 1);
4318
4319 /*
4320 * If this was not the last connection in the session, and we are
4321 * performing session reinstatement or falling back to ERL=0, call
4322 * iscsit_stop_session() without sleeping to shutdown the other
4323 * active connections.
4324 */
4325 if (atomic_read(&sess->nconn)) {
4326 if (!atomic_read(&sess->session_reinstatement) &&
4327 !atomic_read(&sess->session_fall_back_to_erl0)) {
4328 spin_unlock_bh(&sess->conn_lock);
4329 return 0;
4330 }
4331 if (!atomic_read(&sess->session_stop_active)) {
4332 atomic_set(&sess->session_stop_active, 1);
4333 spin_unlock_bh(&sess->conn_lock);
4334 iscsit_stop_session(sess, 0, 0);
4335 return 0;
4336 }
4337 spin_unlock_bh(&sess->conn_lock);
4338 return 0;
4339 }
4340
4341 /*
4342 * If this was the last connection in the session and one of the
4343 * following is occurring:
4344 *
4345 * Session Reinstatement is not being performed, and are falling back
4346 * to ERL=0 call iscsit_close_session().
4347 *
4348 * Session Logout was requested. iscsit_close_session() will be called
4349 * elsewhere.
4350 *
4351 * Session Continuation is not being performed, start the Time2Retain
4352 * handler and check if sleep_on_sess_wait_sem is active.
4353 */
4354 if (!atomic_read(&sess->session_reinstatement) &&
4355 atomic_read(&sess->session_fall_back_to_erl0)) {
4356 spin_unlock_bh(&sess->conn_lock);
4357 target_put_session(sess->se_sess);
4358
4359 return 0;
4360 } else if (atomic_read(&sess->session_logout)) {
4361 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4362 sess->session_state = TARG_SESS_STATE_FREE;
4363 spin_unlock_bh(&sess->conn_lock);
4364
4365 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4366 complete(&sess->session_wait_comp);
4367
4368 return 0;
4369 } else {
4370 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4371 sess->session_state = TARG_SESS_STATE_FAILED;
4372
4373 if (!atomic_read(&sess->session_continuation)) {
4374 spin_unlock_bh(&sess->conn_lock);
4375 iscsit_start_time2retain_handler(sess);
4376 } else
4377 spin_unlock_bh(&sess->conn_lock);
4378
4379 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4380 complete(&sess->session_wait_comp);
4381
4382 return 0;
4383 }
4384 spin_unlock_bh(&sess->conn_lock);
4385
4386 return 0;
4387 }
4388
4389 int iscsit_close_session(struct iscsi_session *sess)
4390 {
4391 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4392 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4393
4394 if (atomic_read(&sess->nconn)) {
4395 pr_err("%d connection(s) still exist for iSCSI session"
4396 " to %s\n", atomic_read(&sess->nconn),
4397 sess->sess_ops->InitiatorName);
4398 BUG();
4399 }
4400
4401 spin_lock_bh(&se_tpg->session_lock);
4402 atomic_set(&sess->session_logout, 1);
4403 atomic_set(&sess->session_reinstatement, 1);
4404 iscsit_stop_time2retain_timer(sess);
4405 spin_unlock_bh(&se_tpg->session_lock);
4406
4407 /*
4408 * transport_deregister_session_configfs() will clear the
4409 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4410 * can be setting it again with __transport_register_session() in
4411 * iscsi_post_login_handler() again after the iscsit_stop_session()
4412 * completes in iscsi_np context.
4413 */
4414 transport_deregister_session_configfs(sess->se_sess);
4415
4416 /*
4417 * If any other processes are accessing this session pointer we must
4418 * wait until they have completed. If we are in an interrupt (the
4419 * time2retain handler) and contain and active session usage count we
4420 * restart the timer and exit.
4421 */
4422 if (!in_interrupt()) {
4423 if (iscsit_check_session_usage_count(sess) == 1)
4424 iscsit_stop_session(sess, 1, 1);
4425 } else {
4426 if (iscsit_check_session_usage_count(sess) == 2) {
4427 atomic_set(&sess->session_logout, 0);
4428 iscsit_start_time2retain_handler(sess);
4429 return 0;
4430 }
4431 }
4432
4433 transport_deregister_session(sess->se_sess);
4434
4435 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4436 iscsit_free_connection_recovery_entires(sess);
4437
4438 iscsit_free_all_ooo_cmdsns(sess);
4439
4440 spin_lock_bh(&se_tpg->session_lock);
4441 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4442 sess->session_state = TARG_SESS_STATE_FREE;
4443 pr_debug("Released iSCSI session from node: %s\n",
4444 sess->sess_ops->InitiatorName);
4445 tpg->nsessions--;
4446 if (tpg->tpg_tiqn)
4447 tpg->tpg_tiqn->tiqn_nsessions--;
4448
4449 pr_debug("Decremented number of active iSCSI Sessions on"
4450 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4451
4452 spin_lock(&sess_idr_lock);
4453 idr_remove(&sess_idr, sess->session_index);
4454 spin_unlock(&sess_idr_lock);
4455
4456 kfree(sess->sess_ops);
4457 sess->sess_ops = NULL;
4458 spin_unlock_bh(&se_tpg->session_lock);
4459
4460 kfree(sess);
4461 return 0;
4462 }
4463
4464 static void iscsit_logout_post_handler_closesession(
4465 struct iscsi_conn *conn)
4466 {
4467 struct iscsi_session *sess = conn->sess;
4468
4469 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4470 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4471
4472 atomic_set(&conn->conn_logout_remove, 0);
4473 complete(&conn->conn_logout_comp);
4474
4475 iscsit_dec_conn_usage_count(conn);
4476 iscsit_stop_session(sess, 1, 1);
4477 iscsit_dec_session_usage_count(sess);
4478 target_put_session(sess->se_sess);
4479 }
4480
4481 static void iscsit_logout_post_handler_samecid(
4482 struct iscsi_conn *conn)
4483 {
4484 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4485 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4486
4487 atomic_set(&conn->conn_logout_remove, 0);
4488 complete(&conn->conn_logout_comp);
4489
4490 iscsit_cause_connection_reinstatement(conn, 1);
4491 iscsit_dec_conn_usage_count(conn);
4492 }
4493
4494 static void iscsit_logout_post_handler_diffcid(
4495 struct iscsi_conn *conn,
4496 u16 cid)
4497 {
4498 struct iscsi_conn *l_conn;
4499 struct iscsi_session *sess = conn->sess;
4500
4501 if (!sess)
4502 return;
4503
4504 spin_lock_bh(&sess->conn_lock);
4505 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4506 if (l_conn->cid == cid) {
4507 iscsit_inc_conn_usage_count(l_conn);
4508 break;
4509 }
4510 }
4511 spin_unlock_bh(&sess->conn_lock);
4512
4513 if (!l_conn)
4514 return;
4515
4516 if (l_conn->sock)
4517 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4518
4519 spin_lock_bh(&l_conn->state_lock);
4520 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4521 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4522 spin_unlock_bh(&l_conn->state_lock);
4523
4524 iscsit_cause_connection_reinstatement(l_conn, 1);
4525 iscsit_dec_conn_usage_count(l_conn);
4526 }
4527
4528 /*
4529 * Return of 0 causes the TX thread to restart.
4530 */
4531 int iscsit_logout_post_handler(
4532 struct iscsi_cmd *cmd,
4533 struct iscsi_conn *conn)
4534 {
4535 int ret = 0;
4536
4537 switch (cmd->logout_reason) {
4538 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4539 switch (cmd->logout_response) {
4540 case ISCSI_LOGOUT_SUCCESS:
4541 case ISCSI_LOGOUT_CLEANUP_FAILED:
4542 default:
4543 iscsit_logout_post_handler_closesession(conn);
4544 break;
4545 }
4546 ret = 0;
4547 break;
4548 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4549 if (conn->cid == cmd->logout_cid) {
4550 switch (cmd->logout_response) {
4551 case ISCSI_LOGOUT_SUCCESS:
4552 case ISCSI_LOGOUT_CLEANUP_FAILED:
4553 default:
4554 iscsit_logout_post_handler_samecid(conn);
4555 break;
4556 }
4557 ret = 0;
4558 } else {
4559 switch (cmd->logout_response) {
4560 case ISCSI_LOGOUT_SUCCESS:
4561 iscsit_logout_post_handler_diffcid(conn,
4562 cmd->logout_cid);
4563 break;
4564 case ISCSI_LOGOUT_CID_NOT_FOUND:
4565 case ISCSI_LOGOUT_CLEANUP_FAILED:
4566 default:
4567 break;
4568 }
4569 ret = 1;
4570 }
4571 break;
4572 case ISCSI_LOGOUT_REASON_RECOVERY:
4573 switch (cmd->logout_response) {
4574 case ISCSI_LOGOUT_SUCCESS:
4575 case ISCSI_LOGOUT_CID_NOT_FOUND:
4576 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4577 case ISCSI_LOGOUT_CLEANUP_FAILED:
4578 default:
4579 break;
4580 }
4581 ret = 1;
4582 break;
4583 default:
4584 break;
4585
4586 }
4587 return ret;
4588 }
4589 EXPORT_SYMBOL(iscsit_logout_post_handler);
4590
4591 void iscsit_fail_session(struct iscsi_session *sess)
4592 {
4593 struct iscsi_conn *conn;
4594
4595 spin_lock_bh(&sess->conn_lock);
4596 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4597 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4598 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4599 }
4600 spin_unlock_bh(&sess->conn_lock);
4601
4602 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4603 sess->session_state = TARG_SESS_STATE_FAILED;
4604 }
4605
4606 int iscsit_free_session(struct iscsi_session *sess)
4607 {
4608 u16 conn_count = atomic_read(&sess->nconn);
4609 struct iscsi_conn *conn, *conn_tmp = NULL;
4610 int is_last;
4611
4612 spin_lock_bh(&sess->conn_lock);
4613 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4614
4615 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4616 conn_list) {
4617 if (conn_count == 0)
4618 break;
4619
4620 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4621 is_last = 1;
4622 } else {
4623 iscsit_inc_conn_usage_count(conn_tmp);
4624 is_last = 0;
4625 }
4626 iscsit_inc_conn_usage_count(conn);
4627
4628 spin_unlock_bh(&sess->conn_lock);
4629 iscsit_cause_connection_reinstatement(conn, 1);
4630 spin_lock_bh(&sess->conn_lock);
4631
4632 iscsit_dec_conn_usage_count(conn);
4633 if (is_last == 0)
4634 iscsit_dec_conn_usage_count(conn_tmp);
4635
4636 conn_count--;
4637 }
4638
4639 if (atomic_read(&sess->nconn)) {
4640 spin_unlock_bh(&sess->conn_lock);
4641 wait_for_completion(&sess->session_wait_comp);
4642 } else
4643 spin_unlock_bh(&sess->conn_lock);
4644
4645 target_put_session(sess->se_sess);
4646 return 0;
4647 }
4648
4649 void iscsit_stop_session(
4650 struct iscsi_session *sess,
4651 int session_sleep,
4652 int connection_sleep)
4653 {
4654 u16 conn_count = atomic_read(&sess->nconn);
4655 struct iscsi_conn *conn, *conn_tmp = NULL;
4656 int is_last;
4657
4658 spin_lock_bh(&sess->conn_lock);
4659 if (session_sleep)
4660 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4661
4662 if (connection_sleep) {
4663 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4664 conn_list) {
4665 if (conn_count == 0)
4666 break;
4667
4668 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4669 is_last = 1;
4670 } else {
4671 iscsit_inc_conn_usage_count(conn_tmp);
4672 is_last = 0;
4673 }
4674 iscsit_inc_conn_usage_count(conn);
4675
4676 spin_unlock_bh(&sess->conn_lock);
4677 iscsit_cause_connection_reinstatement(conn, 1);
4678 spin_lock_bh(&sess->conn_lock);
4679
4680 iscsit_dec_conn_usage_count(conn);
4681 if (is_last == 0)
4682 iscsit_dec_conn_usage_count(conn_tmp);
4683 conn_count--;
4684 }
4685 } else {
4686 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4687 iscsit_cause_connection_reinstatement(conn, 0);
4688 }
4689
4690 if (session_sleep && atomic_read(&sess->nconn)) {
4691 spin_unlock_bh(&sess->conn_lock);
4692 wait_for_completion(&sess->session_wait_comp);
4693 } else
4694 spin_unlock_bh(&sess->conn_lock);
4695 }
4696
4697 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4698 {
4699 struct iscsi_session *sess;
4700 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4701 struct se_session *se_sess, *se_sess_tmp;
4702 int session_count = 0;
4703
4704 spin_lock_bh(&se_tpg->session_lock);
4705 if (tpg->nsessions && !force) {
4706 spin_unlock_bh(&se_tpg->session_lock);
4707 return -1;
4708 }
4709
4710 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4711 sess_list) {
4712 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4713
4714 spin_lock(&sess->conn_lock);
4715 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4716 atomic_read(&sess->session_logout) ||
4717 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4718 spin_unlock(&sess->conn_lock);
4719 continue;
4720 }
4721 atomic_set(&sess->session_reinstatement, 1);
4722 spin_unlock(&sess->conn_lock);
4723 spin_unlock_bh(&se_tpg->session_lock);
4724
4725 iscsit_free_session(sess);
4726 spin_lock_bh(&se_tpg->session_lock);
4727
4728 session_count++;
4729 }
4730 spin_unlock_bh(&se_tpg->session_lock);
4731
4732 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4733 " Group: %hu\n", session_count, tpg->tpgt);
4734 return 0;
4735 }
4736
4737 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4738 MODULE_VERSION("4.1.x");
4739 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4740 MODULE_LICENSE("GPL");
4741
4742 module_init(iscsi_target_init_module);
4743 module_exit(iscsi_target_cleanup_module);
CRIS linux kernel tree