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xfs: remote attribute lookups require the value length
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / target / iscsi / iscsi_target.c
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 u8 reason,
632 int fail_conn,
633 unsigned char *buf,
634 struct iscsi_conn *conn)
635 {
636 struct iscsi_cmd *cmd;
637 struct iscsi_reject *hdr;
638 int ret;
639
640 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
641 if (!cmd)
642 return -1;
643
644 cmd->iscsi_opcode = ISCSI_OP_REJECT;
645 if (fail_conn)
646 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
647
648 hdr = (struct iscsi_reject *) cmd->pdu;
649 hdr->reason = reason;
650
651 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
652 if (!cmd->buf_ptr) {
653 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
654 iscsit_release_cmd(cmd);
655 return -1;
656 }
657
658 spin_lock_bh(&conn->cmd_lock);
659 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
660 spin_unlock_bh(&conn->cmd_lock);
661
662 cmd->i_state = ISTATE_SEND_REJECT;
663 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
664
665 ret = wait_for_completion_interruptible(&cmd->reject_comp);
666 if (ret != 0)
667 return -1;
668
669 return (!fail_conn) ? 0 : -1;
670 }
671
672 int iscsit_add_reject_from_cmd(
673 u8 reason,
674 int fail_conn,
675 int add_to_conn,
676 unsigned char *buf,
677 struct iscsi_cmd *cmd)
678 {
679 struct iscsi_conn *conn;
680 struct iscsi_reject *hdr;
681 int ret;
682
683 if (!cmd->conn) {
684 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
685 cmd->init_task_tag);
686 return -1;
687 }
688 conn = cmd->conn;
689
690 cmd->iscsi_opcode = ISCSI_OP_REJECT;
691 if (fail_conn)
692 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
693
694 hdr = (struct iscsi_reject *) cmd->pdu;
695 hdr->reason = reason;
696
697 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
698 if (!cmd->buf_ptr) {
699 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
700 iscsit_release_cmd(cmd);
701 return -1;
702 }
703
704 if (add_to_conn) {
705 spin_lock_bh(&conn->cmd_lock);
706 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
707 spin_unlock_bh(&conn->cmd_lock);
708 }
709
710 cmd->i_state = ISTATE_SEND_REJECT;
711 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
712
713 ret = wait_for_completion_interruptible(&cmd->reject_comp);
714 /*
715 * Perform the kref_put now if se_cmd has already been setup by
716 * scsit_setup_scsi_cmd()
717 */
718 if (cmd->se_cmd.se_tfo != NULL) {
719 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
720 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
721 }
722 if (ret != 0)
723 return -1;
724
725 return (!fail_conn) ? 0 : -1;
726 }
727 EXPORT_SYMBOL(iscsit_add_reject_from_cmd);
728
729 /*
730 * Map some portion of the allocated scatterlist to an iovec, suitable for
731 * kernel sockets to copy data in/out.
732 */
733 static int iscsit_map_iovec(
734 struct iscsi_cmd *cmd,
735 struct kvec *iov,
736 u32 data_offset,
737 u32 data_length)
738 {
739 u32 i = 0;
740 struct scatterlist *sg;
741 unsigned int page_off;
742
743 /*
744 * We know each entry in t_data_sg contains a page.
745 */
746 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
747 page_off = (data_offset % PAGE_SIZE);
748
749 cmd->first_data_sg = sg;
750 cmd->first_data_sg_off = page_off;
751
752 while (data_length) {
753 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
754
755 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
756 iov[i].iov_len = cur_len;
757
758 data_length -= cur_len;
759 page_off = 0;
760 sg = sg_next(sg);
761 i++;
762 }
763
764 cmd->kmapped_nents = i;
765
766 return i;
767 }
768
769 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
770 {
771 u32 i;
772 struct scatterlist *sg;
773
774 sg = cmd->first_data_sg;
775
776 for (i = 0; i < cmd->kmapped_nents; i++)
777 kunmap(sg_page(&sg[i]));
778 }
779
780 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
781 {
782 struct iscsi_cmd *cmd;
783
784 conn->exp_statsn = exp_statsn;
785
786 if (conn->sess->sess_ops->RDMAExtensions)
787 return;
788
789 spin_lock_bh(&conn->cmd_lock);
790 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
791 spin_lock(&cmd->istate_lock);
792 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
793 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
794 cmd->i_state = ISTATE_REMOVE;
795 spin_unlock(&cmd->istate_lock);
796 iscsit_add_cmd_to_immediate_queue(cmd, conn,
797 cmd->i_state);
798 continue;
799 }
800 spin_unlock(&cmd->istate_lock);
801 }
802 spin_unlock_bh(&conn->cmd_lock);
803 }
804
805 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
806 {
807 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
808
809 iov_count += ISCSI_IOV_DATA_BUFFER;
810
811 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
812 if (!cmd->iov_data) {
813 pr_err("Unable to allocate cmd->iov_data\n");
814 return -ENOMEM;
815 }
816
817 cmd->orig_iov_data_count = iov_count;
818 return 0;
819 }
820
821 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
822 unsigned char *buf)
823 {
824 int data_direction, payload_length;
825 struct iscsi_scsi_req *hdr;
826 int iscsi_task_attr;
827 int sam_task_attr;
828
829 spin_lock_bh(&conn->sess->session_stats_lock);
830 conn->sess->cmd_pdus++;
831 if (conn->sess->se_sess->se_node_acl) {
832 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
833 conn->sess->se_sess->se_node_acl->num_cmds++;
834 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
835 }
836 spin_unlock_bh(&conn->sess->session_stats_lock);
837
838 hdr = (struct iscsi_scsi_req *) buf;
839 payload_length = ntoh24(hdr->dlength);
840
841 /* FIXME; Add checks for AdditionalHeaderSegment */
842
843 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
844 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
845 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
846 " not set. Bad iSCSI Initiator.\n");
847 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
848 1, 1, buf, cmd);
849 }
850
851 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
852 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
853 /*
854 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
855 * that adds support for RESERVE/RELEASE. There is a bug
856 * add with this new functionality that sets R/W bits when
857 * neither CDB carries any READ or WRITE datapayloads.
858 */
859 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
860 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
861 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
862 goto done;
863 }
864
865 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
866 " set when Expected Data Transfer Length is 0 for"
867 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
868 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
869 1, 1, buf, cmd);
870 }
871 done:
872
873 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
874 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
875 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
876 " MUST be set if Expected Data Transfer Length is not 0."
877 " Bad iSCSI Initiator\n");
878 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
879 1, 1, buf, cmd);
880 }
881
882 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
883 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
884 pr_err("Bidirectional operations not supported!\n");
885 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
886 1, 1, buf, cmd);
887 }
888
889 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
890 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
891 " Scsi Command PDU.\n");
892 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
893 1, 1, buf, cmd);
894 }
895
896 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
897 pr_err("ImmediateData=No but DataSegmentLength=%u,"
898 " protocol error.\n", payload_length);
899 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
900 1, 1, buf, cmd);
901 }
902
903 if ((be32_to_cpu(hdr->data_length )== payload_length) &&
904 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
905 pr_err("Expected Data Transfer Length and Length of"
906 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
907 " bit is not set protocol error\n");
908 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
909 1, 1, buf, cmd);
910 }
911
912 if (payload_length > be32_to_cpu(hdr->data_length)) {
913 pr_err("DataSegmentLength: %u is greater than"
914 " EDTL: %u, protocol error.\n", payload_length,
915 hdr->data_length);
916 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
917 1, 1, buf, cmd);
918 }
919
920 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
921 pr_err("DataSegmentLength: %u is greater than"
922 " MaxXmitDataSegmentLength: %u, protocol error.\n",
923 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
924 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
925 1, 1, buf, cmd);
926 }
927
928 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
929 pr_err("DataSegmentLength: %u is greater than"
930 " FirstBurstLength: %u, protocol error.\n",
931 payload_length, conn->sess->sess_ops->FirstBurstLength);
932 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
933 1, 1, buf, cmd);
934 }
935
936 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
937 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
938 DMA_NONE;
939
940 cmd->data_direction = data_direction;
941 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
942 /*
943 * Figure out the SAM Task Attribute for the incoming SCSI CDB
944 */
945 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
946 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
947 sam_task_attr = MSG_SIMPLE_TAG;
948 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
949 sam_task_attr = MSG_ORDERED_TAG;
950 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
951 sam_task_attr = MSG_HEAD_TAG;
952 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
953 sam_task_attr = MSG_ACA_TAG;
954 else {
955 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
956 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
957 sam_task_attr = MSG_SIMPLE_TAG;
958 }
959
960 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
961 cmd->i_state = ISTATE_NEW_CMD;
962 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
963 cmd->immediate_data = (payload_length) ? 1 : 0;
964 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
965 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
966 if (cmd->unsolicited_data)
967 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
968
969 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
970 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
971 spin_lock_bh(&conn->sess->ttt_lock);
972 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
973 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
974 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
975 spin_unlock_bh(&conn->sess->ttt_lock);
976 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
977 cmd->targ_xfer_tag = 0xFFFFFFFF;
978 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
979 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
980 cmd->first_burst_len = payload_length;
981
982 if (!conn->sess->sess_ops->RDMAExtensions &&
983 cmd->data_direction == DMA_FROM_DEVICE) {
984 struct iscsi_datain_req *dr;
985
986 dr = iscsit_allocate_datain_req();
987 if (!dr)
988 return iscsit_add_reject_from_cmd(
989 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
990 1, 1, buf, cmd);
991
992 iscsit_attach_datain_req(cmd, dr);
993 }
994
995 /*
996 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
997 */
998 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
999 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1000 cmd->data_direction, sam_task_attr,
1001 cmd->sense_buffer + 2);
1002
1003 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1004 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1005 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1006 conn->cid);
1007
1008 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1009
1010 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1011 scsilun_to_int(&hdr->lun));
1012 if (cmd->sense_reason)
1013 goto attach_cmd;
1014
1015 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1016 if (cmd->sense_reason) {
1017 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1018 return iscsit_add_reject_from_cmd(
1019 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1020 1, 1, buf, cmd);
1021 }
1022
1023 goto attach_cmd;
1024 }
1025
1026 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1027 return iscsit_add_reject_from_cmd(
1028 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1029 1, 1, buf, cmd);
1030 }
1031
1032 attach_cmd:
1033 spin_lock_bh(&conn->cmd_lock);
1034 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1035 spin_unlock_bh(&conn->cmd_lock);
1036 /*
1037 * Check if we need to delay processing because of ALUA
1038 * Active/NonOptimized primary access state..
1039 */
1040 core_alua_check_nonop_delay(&cmd->se_cmd);
1041
1042 return 0;
1043 }
1044 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1045
1046 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1047 {
1048 iscsit_set_dataout_sequence_values(cmd);
1049
1050 spin_lock_bh(&cmd->dataout_timeout_lock);
1051 iscsit_start_dataout_timer(cmd, cmd->conn);
1052 spin_unlock_bh(&cmd->dataout_timeout_lock);
1053 }
1054 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1055
1056 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1057 struct iscsi_scsi_req *hdr)
1058 {
1059 int cmdsn_ret = 0;
1060 /*
1061 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1062 * the Immediate Bit is not set, and no Immediate
1063 * Data is attached.
1064 *
1065 * A PDU/CmdSN carrying Immediate Data can only
1066 * be processed after the DataCRC has passed.
1067 * If the DataCRC fails, the CmdSN MUST NOT
1068 * be acknowledged. (See below)
1069 */
1070 if (!cmd->immediate_data) {
1071 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1072 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
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 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
1079 return iscsit_add_reject_from_cmd(
1080 ISCSI_REASON_PROTOCOL_ERROR,
1081 1, 0, (unsigned char *)hdr, cmd);
1082 }
1083 }
1084
1085 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1086
1087 /*
1088 * If no Immediate Data is attached, it's OK to return now.
1089 */
1090 if (!cmd->immediate_data) {
1091 if (!cmd->sense_reason && cmd->unsolicited_data)
1092 iscsit_set_unsoliticed_dataout(cmd);
1093 if (!cmd->sense_reason)
1094 return 0;
1095
1096 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1097 return 0;
1098 }
1099
1100 /*
1101 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1102 * execution. These exceptions are processed in CmdSN order using
1103 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1104 */
1105 if (cmd->sense_reason) {
1106 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1107 return 1;
1108 }
1109 /*
1110 * Call directly into transport_generic_new_cmd() to perform
1111 * the backend memory allocation.
1112 */
1113 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1114 if (cmd->sense_reason) {
1115 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1116 return 1;
1117 }
1118
1119 return 0;
1120 }
1121 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1122
1123 static int
1124 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1125 bool dump_payload)
1126 {
1127 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1128 /*
1129 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1130 */
1131 if (dump_payload == true)
1132 goto after_immediate_data;
1133
1134 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1135 cmd->first_burst_len);
1136 after_immediate_data:
1137 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1138 /*
1139 * A PDU/CmdSN carrying Immediate Data passed
1140 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1141 * Immediate Bit is not set.
1142 */
1143 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, hdr->cmdsn);
1144
1145 if (cmd->sense_reason) {
1146 if (iscsit_dump_data_payload(cmd->conn,
1147 cmd->first_burst_len, 1) < 0)
1148 return -1;
1149 } else if (cmd->unsolicited_data)
1150 iscsit_set_unsoliticed_dataout(cmd);
1151
1152 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1153 return iscsit_add_reject_from_cmd(
1154 ISCSI_REASON_PROTOCOL_ERROR,
1155 1, 0, (unsigned char *)hdr, cmd);
1156
1157 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1158 /*
1159 * Immediate Data failed DataCRC and ERL>=1,
1160 * silently drop this PDU and let the initiator
1161 * plug the CmdSN gap.
1162 *
1163 * FIXME: Send Unsolicited NOPIN with reserved
1164 * TTT here to help the initiator figure out
1165 * the missing CmdSN, although they should be
1166 * intelligent enough to determine the missing
1167 * CmdSN and issue a retry to plug the sequence.
1168 */
1169 cmd->i_state = ISTATE_REMOVE;
1170 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1171 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1172 return -1;
1173
1174 return 0;
1175 }
1176
1177 static int
1178 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1179 unsigned char *buf)
1180 {
1181 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1182 int rc, immed_data;
1183 bool dump_payload = false;
1184
1185 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1186 if (rc < 0)
1187 return rc;
1188 /*
1189 * Allocation iovecs needed for struct socket operations for
1190 * traditional iSCSI block I/O.
1191 */
1192 if (iscsit_allocate_iovecs(cmd) < 0) {
1193 return iscsit_add_reject_from_cmd(
1194 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1195 1, 0, buf, cmd);
1196 }
1197 immed_data = cmd->immediate_data;
1198
1199 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1200 if (rc < 0)
1201 return rc;
1202 else if (rc > 0)
1203 dump_payload = true;
1204
1205 if (!immed_data)
1206 return 0;
1207
1208 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1209 }
1210
1211 static u32 iscsit_do_crypto_hash_sg(
1212 struct hash_desc *hash,
1213 struct iscsi_cmd *cmd,
1214 u32 data_offset,
1215 u32 data_length,
1216 u32 padding,
1217 u8 *pad_bytes)
1218 {
1219 u32 data_crc;
1220 u32 i;
1221 struct scatterlist *sg;
1222 unsigned int page_off;
1223
1224 crypto_hash_init(hash);
1225
1226 sg = cmd->first_data_sg;
1227 page_off = cmd->first_data_sg_off;
1228
1229 i = 0;
1230 while (data_length) {
1231 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1232
1233 crypto_hash_update(hash, &sg[i], cur_len);
1234
1235 data_length -= cur_len;
1236 page_off = 0;
1237 i++;
1238 }
1239
1240 if (padding) {
1241 struct scatterlist pad_sg;
1242
1243 sg_init_one(&pad_sg, pad_bytes, padding);
1244 crypto_hash_update(hash, &pad_sg, padding);
1245 }
1246 crypto_hash_final(hash, (u8 *) &data_crc);
1247
1248 return data_crc;
1249 }
1250
1251 static void iscsit_do_crypto_hash_buf(
1252 struct hash_desc *hash,
1253 unsigned char *buf,
1254 u32 payload_length,
1255 u32 padding,
1256 u8 *pad_bytes,
1257 u8 *data_crc)
1258 {
1259 struct scatterlist sg;
1260
1261 crypto_hash_init(hash);
1262
1263 sg_init_one(&sg, buf, payload_length);
1264 crypto_hash_update(hash, &sg, payload_length);
1265
1266 if (padding) {
1267 sg_init_one(&sg, pad_bytes, padding);
1268 crypto_hash_update(hash, &sg, padding);
1269 }
1270 crypto_hash_final(hash, data_crc);
1271 }
1272
1273 int
1274 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1275 struct iscsi_cmd **out_cmd)
1276 {
1277 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1278 struct iscsi_cmd *cmd = NULL;
1279 struct se_cmd *se_cmd;
1280 unsigned long flags;
1281 u32 payload_length = ntoh24(hdr->dlength);
1282 int rc;
1283
1284 if (!payload_length) {
1285 pr_err("DataOUT payload is ZERO, protocol error.\n");
1286 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1287 buf, conn);
1288 }
1289
1290 /* iSCSI write */
1291 spin_lock_bh(&conn->sess->session_stats_lock);
1292 conn->sess->rx_data_octets += payload_length;
1293 if (conn->sess->se_sess->se_node_acl) {
1294 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1295 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1296 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1297 }
1298 spin_unlock_bh(&conn->sess->session_stats_lock);
1299
1300 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1301 pr_err("DataSegmentLength: %u is greater than"
1302 " MaxXmitDataSegmentLength: %u\n", payload_length,
1303 conn->conn_ops->MaxXmitDataSegmentLength);
1304 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1305 buf, conn);
1306 }
1307
1308 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1309 payload_length);
1310 if (!cmd)
1311 return 0;
1312
1313 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1314 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1315 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1316 payload_length, conn->cid);
1317
1318 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1319 pr_err("Command ITT: 0x%08x received DataOUT after"
1320 " last DataOUT received, dumping payload\n",
1321 cmd->init_task_tag);
1322 return iscsit_dump_data_payload(conn, payload_length, 1);
1323 }
1324
1325 if (cmd->data_direction != DMA_TO_DEVICE) {
1326 pr_err("Command ITT: 0x%08x received DataOUT for a"
1327 " NON-WRITE command.\n", cmd->init_task_tag);
1328 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1329 1, 0, buf, cmd);
1330 }
1331 se_cmd = &cmd->se_cmd;
1332 iscsit_mod_dataout_timer(cmd);
1333
1334 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1335 pr_err("DataOut Offset: %u, Length %u greater than"
1336 " iSCSI Command EDTL %u, protocol error.\n",
1337 hdr->offset, payload_length, cmd->se_cmd.data_length);
1338 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1339 1, 0, buf, cmd);
1340 }
1341
1342 if (cmd->unsolicited_data) {
1343 int dump_unsolicited_data = 0;
1344
1345 if (conn->sess->sess_ops->InitialR2T) {
1346 pr_err("Received unexpected unsolicited data"
1347 " while InitialR2T=Yes, protocol error.\n");
1348 transport_send_check_condition_and_sense(&cmd->se_cmd,
1349 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1350 return -1;
1351 }
1352 /*
1353 * Special case for dealing with Unsolicited DataOUT
1354 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1355 * failures;
1356 */
1357
1358 /* Something's amiss if we're not in WRITE_PENDING state... */
1359 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1360 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1361 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1362
1363 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1364 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1365 dump_unsolicited_data = 1;
1366 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1367
1368 if (dump_unsolicited_data) {
1369 /*
1370 * Check if a delayed TASK_ABORTED status needs to
1371 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1372 * received with the unsolicitied data out.
1373 */
1374 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1375 iscsit_stop_dataout_timer(cmd);
1376
1377 transport_check_aborted_status(se_cmd,
1378 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1379 return iscsit_dump_data_payload(conn, payload_length, 1);
1380 }
1381 } else {
1382 /*
1383 * For the normal solicited data path:
1384 *
1385 * Check for a delayed TASK_ABORTED status and dump any
1386 * incoming data out payload if one exists. Also, when the
1387 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1388 * data out sequence, we decrement outstanding_r2ts. Once
1389 * outstanding_r2ts reaches zero, go ahead and send the delayed
1390 * TASK_ABORTED status.
1391 */
1392 if (se_cmd->transport_state & CMD_T_ABORTED) {
1393 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1394 if (--cmd->outstanding_r2ts < 1) {
1395 iscsit_stop_dataout_timer(cmd);
1396 transport_check_aborted_status(
1397 se_cmd, 1);
1398 }
1399
1400 return iscsit_dump_data_payload(conn, payload_length, 1);
1401 }
1402 }
1403 /*
1404 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1405 * within-command recovery checks before receiving the payload.
1406 */
1407 rc = iscsit_check_pre_dataout(cmd, buf);
1408 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1409 return 0;
1410 else if (rc == DATAOUT_CANNOT_RECOVER)
1411 return -1;
1412
1413 *out_cmd = cmd;
1414 return 0;
1415 }
1416 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1417
1418 static int
1419 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1420 struct iscsi_data *hdr)
1421 {
1422 struct kvec *iov;
1423 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1424 u32 payload_length = ntoh24(hdr->dlength);
1425 int iov_ret, data_crc_failed = 0;
1426
1427 rx_size += payload_length;
1428 iov = &cmd->iov_data[0];
1429
1430 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1431 payload_length);
1432 if (iov_ret < 0)
1433 return -1;
1434
1435 iov_count += iov_ret;
1436
1437 padding = ((-payload_length) & 3);
1438 if (padding != 0) {
1439 iov[iov_count].iov_base = cmd->pad_bytes;
1440 iov[iov_count++].iov_len = padding;
1441 rx_size += padding;
1442 pr_debug("Receiving %u padding bytes.\n", padding);
1443 }
1444
1445 if (conn->conn_ops->DataDigest) {
1446 iov[iov_count].iov_base = &checksum;
1447 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1448 rx_size += ISCSI_CRC_LEN;
1449 }
1450
1451 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1452
1453 iscsit_unmap_iovec(cmd);
1454
1455 if (rx_got != rx_size)
1456 return -1;
1457
1458 if (conn->conn_ops->DataDigest) {
1459 u32 data_crc;
1460
1461 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1462 be32_to_cpu(hdr->offset),
1463 payload_length, padding,
1464 cmd->pad_bytes);
1465
1466 if (checksum != data_crc) {
1467 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1468 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1469 " does not match computed 0x%08x\n",
1470 hdr->itt, hdr->offset, payload_length,
1471 hdr->datasn, checksum, data_crc);
1472 data_crc_failed = 1;
1473 } else {
1474 pr_debug("Got CRC32C DataDigest 0x%08x for"
1475 " %u bytes of Data Out\n", checksum,
1476 payload_length);
1477 }
1478 }
1479
1480 return data_crc_failed;
1481 }
1482
1483 int
1484 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1485 bool data_crc_failed)
1486 {
1487 struct iscsi_conn *conn = cmd->conn;
1488 int rc, ooo_cmdsn;
1489 /*
1490 * Increment post receive data and CRC values or perform
1491 * within-command recovery.
1492 */
1493 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1494 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1495 return 0;
1496 else if (rc == DATAOUT_SEND_R2T) {
1497 iscsit_set_dataout_sequence_values(cmd);
1498 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1499 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1500 /*
1501 * Handle extra special case for out of order
1502 * Unsolicited Data Out.
1503 */
1504 spin_lock_bh(&cmd->istate_lock);
1505 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1506 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1507 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1508 spin_unlock_bh(&cmd->istate_lock);
1509
1510 iscsit_stop_dataout_timer(cmd);
1511 if (ooo_cmdsn)
1512 return 0;
1513 target_execute_cmd(&cmd->se_cmd);
1514 return 0;
1515 } else /* DATAOUT_CANNOT_RECOVER */
1516 return -1;
1517
1518 return 0;
1519 }
1520 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1521
1522 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1523 {
1524 struct iscsi_cmd *cmd;
1525 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1526 int rc;
1527 bool data_crc_failed = false;
1528
1529 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1530 if (rc < 0)
1531 return rc;
1532 else if (!cmd)
1533 return 0;
1534
1535 rc = iscsit_get_dataout(conn, cmd, hdr);
1536 if (rc < 0)
1537 return rc;
1538 else if (rc > 0)
1539 data_crc_failed = true;
1540
1541 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1542 }
1543
1544 int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1545 unsigned char *buf)
1546 {
1547 unsigned char *ping_data = NULL;
1548 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1549 u32 checksum, data_crc, padding = 0, payload_length;
1550 struct iscsi_cmd *cmd_p = NULL;
1551 struct kvec *iov = NULL;
1552 struct iscsi_nopout *hdr;
1553
1554 hdr = (struct iscsi_nopout *) buf;
1555 payload_length = ntoh24(hdr->dlength);
1556
1557 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1558 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1559 " not set, protocol error.\n");
1560 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1561 buf, conn);
1562 }
1563
1564 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1565 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1566 " greater than MaxXmitDataSegmentLength: %u, protocol"
1567 " error.\n", payload_length,
1568 conn->conn_ops->MaxXmitDataSegmentLength);
1569 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1570 buf, conn);
1571 }
1572
1573 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1574 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1575 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1576 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1577 payload_length);
1578 /*
1579 * This is not a response to a Unsolicited NopIN, which means
1580 * it can either be a NOPOUT ping request (with a valid ITT),
1581 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1582 * Either way, make sure we allocate an struct iscsi_cmd, as both
1583 * can contain ping data.
1584 */
1585 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1586 if (!cmd)
1587 return iscsit_add_reject(
1588 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1589 1, buf, conn);
1590
1591 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1592 cmd->i_state = ISTATE_SEND_NOPIN;
1593 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1594 1 : 0);
1595 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1596 cmd->targ_xfer_tag = 0xFFFFFFFF;
1597 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1598 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1599 cmd->data_direction = DMA_NONE;
1600 }
1601
1602 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1603 rx_size = payload_length;
1604 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1605 if (!ping_data) {
1606 pr_err("Unable to allocate memory for"
1607 " NOPOUT ping data.\n");
1608 ret = -1;
1609 goto out;
1610 }
1611
1612 iov = &cmd->iov_misc[0];
1613 iov[niov].iov_base = ping_data;
1614 iov[niov++].iov_len = payload_length;
1615
1616 padding = ((-payload_length) & 3);
1617 if (padding != 0) {
1618 pr_debug("Receiving %u additional bytes"
1619 " for padding.\n", padding);
1620 iov[niov].iov_base = &cmd->pad_bytes;
1621 iov[niov++].iov_len = padding;
1622 rx_size += padding;
1623 }
1624 if (conn->conn_ops->DataDigest) {
1625 iov[niov].iov_base = &checksum;
1626 iov[niov++].iov_len = ISCSI_CRC_LEN;
1627 rx_size += ISCSI_CRC_LEN;
1628 }
1629
1630 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1631 if (rx_got != rx_size) {
1632 ret = -1;
1633 goto out;
1634 }
1635
1636 if (conn->conn_ops->DataDigest) {
1637 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1638 ping_data, payload_length,
1639 padding, cmd->pad_bytes,
1640 (u8 *)&data_crc);
1641
1642 if (checksum != data_crc) {
1643 pr_err("Ping data CRC32C DataDigest"
1644 " 0x%08x does not match computed 0x%08x\n",
1645 checksum, data_crc);
1646 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1647 pr_err("Unable to recover from"
1648 " NOPOUT Ping DataCRC failure while in"
1649 " ERL=0.\n");
1650 ret = -1;
1651 goto out;
1652 } else {
1653 /*
1654 * Silently drop this PDU and let the
1655 * initiator plug the CmdSN gap.
1656 */
1657 pr_debug("Dropping NOPOUT"
1658 " Command CmdSN: 0x%08x due to"
1659 " DataCRC error.\n", hdr->cmdsn);
1660 ret = 0;
1661 goto out;
1662 }
1663 } else {
1664 pr_debug("Got CRC32C DataDigest"
1665 " 0x%08x for %u bytes of ping data.\n",
1666 checksum, payload_length);
1667 }
1668 }
1669
1670 ping_data[payload_length] = '\0';
1671 /*
1672 * Attach ping data to struct iscsi_cmd->buf_ptr.
1673 */
1674 cmd->buf_ptr = ping_data;
1675 cmd->buf_ptr_size = payload_length;
1676
1677 pr_debug("Got %u bytes of NOPOUT ping"
1678 " data.\n", payload_length);
1679 pr_debug("Ping Data: \"%s\"\n", ping_data);
1680 }
1681
1682 if (hdr->itt != RESERVED_ITT) {
1683 if (!cmd) {
1684 pr_err("Checking CmdSN for NOPOUT,"
1685 " but cmd is NULL!\n");
1686 return -1;
1687 }
1688 /*
1689 * Initiator is expecting a NopIN ping reply,
1690 */
1691 spin_lock_bh(&conn->cmd_lock);
1692 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1693 spin_unlock_bh(&conn->cmd_lock);
1694
1695 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1696
1697 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1698 iscsit_add_cmd_to_response_queue(cmd, conn,
1699 cmd->i_state);
1700 return 0;
1701 }
1702
1703 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1704 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1705 ret = 0;
1706 goto ping_out;
1707 }
1708 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1709 return iscsit_add_reject_from_cmd(
1710 ISCSI_REASON_PROTOCOL_ERROR,
1711 1, 0, buf, cmd);
1712
1713 return 0;
1714 }
1715
1716 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1717 /*
1718 * This was a response to a unsolicited NOPIN ping.
1719 */
1720 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1721 if (!cmd_p)
1722 return -1;
1723
1724 iscsit_stop_nopin_response_timer(conn);
1725
1726 cmd_p->i_state = ISTATE_REMOVE;
1727 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1728 iscsit_start_nopin_timer(conn);
1729 } else {
1730 /*
1731 * Initiator is not expecting a NOPIN is response.
1732 * Just ignore for now.
1733 *
1734 * iSCSI v19-91 10.18
1735 * "A NOP-OUT may also be used to confirm a changed
1736 * ExpStatSN if another PDU will not be available
1737 * for a long time."
1738 */
1739 ret = 0;
1740 goto out;
1741 }
1742
1743 return 0;
1744 out:
1745 if (cmd)
1746 iscsit_release_cmd(cmd);
1747 ping_out:
1748 kfree(ping_data);
1749 return ret;
1750 }
1751 EXPORT_SYMBOL(iscsit_handle_nop_out);
1752
1753 int
1754 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1755 unsigned char *buf)
1756 {
1757 struct se_tmr_req *se_tmr;
1758 struct iscsi_tmr_req *tmr_req;
1759 struct iscsi_tm *hdr;
1760 int out_of_order_cmdsn = 0;
1761 int ret;
1762 u8 function;
1763
1764 hdr = (struct iscsi_tm *) buf;
1765 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1766 function = hdr->flags;
1767
1768 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1769 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1770 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1771 hdr->rtt, hdr->refcmdsn, conn->cid);
1772
1773 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1774 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1775 hdr->rtt != RESERVED_ITT)) {
1776 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1777 hdr->rtt = RESERVED_ITT;
1778 }
1779
1780 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1781 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1782 pr_err("Task Management Request TASK_REASSIGN not"
1783 " issued as immediate command, bad iSCSI Initiator"
1784 "implementation\n");
1785 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1786 1, 1, buf, cmd);
1787 }
1788 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1789 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1790 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1791
1792 cmd->data_direction = DMA_NONE;
1793
1794 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1795 if (!cmd->tmr_req) {
1796 pr_err("Unable to allocate memory for"
1797 " Task Management command!\n");
1798 return iscsit_add_reject_from_cmd(
1799 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1800 1, 1, buf, cmd);
1801 }
1802
1803 /*
1804 * TASK_REASSIGN for ERL=2 / connection stays inside of
1805 * LIO-Target $FABRIC_MOD
1806 */
1807 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1808
1809 u8 tcm_function;
1810 int ret;
1811
1812 transport_init_se_cmd(&cmd->se_cmd,
1813 &lio_target_fabric_configfs->tf_ops,
1814 conn->sess->se_sess, 0, DMA_NONE,
1815 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1816
1817 switch (function) {
1818 case ISCSI_TM_FUNC_ABORT_TASK:
1819 tcm_function = TMR_ABORT_TASK;
1820 break;
1821 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1822 tcm_function = TMR_ABORT_TASK_SET;
1823 break;
1824 case ISCSI_TM_FUNC_CLEAR_ACA:
1825 tcm_function = TMR_CLEAR_ACA;
1826 break;
1827 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1828 tcm_function = TMR_CLEAR_TASK_SET;
1829 break;
1830 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1831 tcm_function = TMR_LUN_RESET;
1832 break;
1833 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1834 tcm_function = TMR_TARGET_WARM_RESET;
1835 break;
1836 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1837 tcm_function = TMR_TARGET_COLD_RESET;
1838 break;
1839 default:
1840 pr_err("Unknown iSCSI TMR Function:"
1841 " 0x%02x\n", function);
1842 return iscsit_add_reject_from_cmd(
1843 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1844 1, 1, buf, cmd);
1845 }
1846
1847 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1848 tcm_function, GFP_KERNEL);
1849 if (ret < 0)
1850 return iscsit_add_reject_from_cmd(
1851 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1852 1, 1, buf, cmd);
1853
1854 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1855 }
1856
1857 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1858 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1859 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1860 cmd->init_task_tag = hdr->itt;
1861 cmd->targ_xfer_tag = 0xFFFFFFFF;
1862 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1863 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1864 se_tmr = cmd->se_cmd.se_tmr_req;
1865 tmr_req = cmd->tmr_req;
1866 /*
1867 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1868 */
1869 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1870 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1871 scsilun_to_int(&hdr->lun));
1872 if (ret < 0) {
1873 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1874 goto attach;
1875 }
1876 }
1877
1878 switch (function) {
1879 case ISCSI_TM_FUNC_ABORT_TASK:
1880 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1881 if (se_tmr->response)
1882 goto attach;
1883 break;
1884 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1885 case ISCSI_TM_FUNC_CLEAR_ACA:
1886 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1887 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1888 break;
1889 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1890 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1891 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1892 goto attach;
1893 }
1894 break;
1895 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1896 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1897 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1898 goto attach;
1899 }
1900 break;
1901 case ISCSI_TM_FUNC_TASK_REASSIGN:
1902 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1903 /*
1904 * Perform sanity checks on the ExpDataSN only if the
1905 * TASK_REASSIGN was successful.
1906 */
1907 if (se_tmr->response)
1908 break;
1909
1910 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1911 return iscsit_add_reject_from_cmd(
1912 ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1913 buf, cmd);
1914 break;
1915 default:
1916 pr_err("Unknown TMR function: 0x%02x, protocol"
1917 " error.\n", function);
1918 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1919 goto attach;
1920 }
1921
1922 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1923 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1924 se_tmr->call_transport = 1;
1925 attach:
1926 spin_lock_bh(&conn->cmd_lock);
1927 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1928 spin_unlock_bh(&conn->cmd_lock);
1929
1930 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1931 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1932 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1933 out_of_order_cmdsn = 1;
1934 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1935 return 0;
1936 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1937 return iscsit_add_reject_from_cmd(
1938 ISCSI_REASON_PROTOCOL_ERROR,
1939 1, 0, buf, cmd);
1940 }
1941 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1942
1943 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1944 return 0;
1945 /*
1946 * Found the referenced task, send to transport for processing.
1947 */
1948 if (se_tmr->call_transport)
1949 return transport_generic_handle_tmr(&cmd->se_cmd);
1950
1951 /*
1952 * Could not find the referenced LUN, task, or Task Management
1953 * command not authorized or supported. Change state and
1954 * let the tx_thread send the response.
1955 *
1956 * For connection recovery, this is also the default action for
1957 * TMR TASK_REASSIGN.
1958 */
1959 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1960 return 0;
1961 }
1962 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1963
1964 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1965 static int iscsit_handle_text_cmd(
1966 struct iscsi_conn *conn,
1967 unsigned char *buf)
1968 {
1969 char *text_ptr, *text_in;
1970 int cmdsn_ret, niov = 0, rx_got, rx_size;
1971 u32 checksum = 0, data_crc = 0, payload_length;
1972 u32 padding = 0, pad_bytes = 0, text_length = 0;
1973 struct iscsi_cmd *cmd;
1974 struct kvec iov[3];
1975 struct iscsi_text *hdr;
1976
1977 hdr = (struct iscsi_text *) buf;
1978 payload_length = ntoh24(hdr->dlength);
1979
1980 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1981 pr_err("Unable to accept text parameter length: %u"
1982 "greater than MaxXmitDataSegmentLength %u.\n",
1983 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1984 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1985 buf, conn);
1986 }
1987
1988 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1989 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1990 hdr->exp_statsn, payload_length);
1991
1992 rx_size = text_length = payload_length;
1993 if (text_length) {
1994 text_in = kzalloc(text_length, GFP_KERNEL);
1995 if (!text_in) {
1996 pr_err("Unable to allocate memory for"
1997 " incoming text parameters\n");
1998 return -1;
1999 }
2000
2001 memset(iov, 0, 3 * sizeof(struct kvec));
2002 iov[niov].iov_base = text_in;
2003 iov[niov++].iov_len = text_length;
2004
2005 padding = ((-payload_length) & 3);
2006 if (padding != 0) {
2007 iov[niov].iov_base = &pad_bytes;
2008 iov[niov++].iov_len = padding;
2009 rx_size += padding;
2010 pr_debug("Receiving %u additional bytes"
2011 " for padding.\n", padding);
2012 }
2013 if (conn->conn_ops->DataDigest) {
2014 iov[niov].iov_base = &checksum;
2015 iov[niov++].iov_len = ISCSI_CRC_LEN;
2016 rx_size += ISCSI_CRC_LEN;
2017 }
2018
2019 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2020 if (rx_got != rx_size) {
2021 kfree(text_in);
2022 return -1;
2023 }
2024
2025 if (conn->conn_ops->DataDigest) {
2026 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2027 text_in, text_length,
2028 padding, (u8 *)&pad_bytes,
2029 (u8 *)&data_crc);
2030
2031 if (checksum != data_crc) {
2032 pr_err("Text data CRC32C DataDigest"
2033 " 0x%08x does not match computed"
2034 " 0x%08x\n", checksum, data_crc);
2035 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2036 pr_err("Unable to recover from"
2037 " Text Data digest failure while in"
2038 " ERL=0.\n");
2039 kfree(text_in);
2040 return -1;
2041 } else {
2042 /*
2043 * Silently drop this PDU and let the
2044 * initiator plug the CmdSN gap.
2045 */
2046 pr_debug("Dropping Text"
2047 " Command CmdSN: 0x%08x due to"
2048 " DataCRC error.\n", hdr->cmdsn);
2049 kfree(text_in);
2050 return 0;
2051 }
2052 } else {
2053 pr_debug("Got CRC32C DataDigest"
2054 " 0x%08x for %u bytes of text data.\n",
2055 checksum, text_length);
2056 }
2057 }
2058 text_in[text_length - 1] = '\0';
2059 pr_debug("Successfully read %d bytes of text"
2060 " data.\n", text_length);
2061
2062 if (strncmp("SendTargets", text_in, 11) != 0) {
2063 pr_err("Received Text Data that is not"
2064 " SendTargets, cannot continue.\n");
2065 kfree(text_in);
2066 return -1;
2067 }
2068 text_ptr = strchr(text_in, '=');
2069 if (!text_ptr) {
2070 pr_err("No \"=\" separator found in Text Data,"
2071 " cannot continue.\n");
2072 kfree(text_in);
2073 return -1;
2074 }
2075 if (strncmp("=All", text_ptr, 4) != 0) {
2076 pr_err("Unable to locate All value for"
2077 " SendTargets key, cannot continue.\n");
2078 kfree(text_in);
2079 return -1;
2080 }
2081 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
2082 kfree(text_in);
2083 }
2084
2085 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2086 if (!cmd)
2087 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2088 1, buf, conn);
2089
2090 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2091 cmd->i_state = ISTATE_SEND_TEXTRSP;
2092 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2093 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2094 cmd->targ_xfer_tag = 0xFFFFFFFF;
2095 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2096 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2097 cmd->data_direction = DMA_NONE;
2098
2099 spin_lock_bh(&conn->cmd_lock);
2100 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2101 spin_unlock_bh(&conn->cmd_lock);
2102
2103 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2104
2105 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2106 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2107 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2108 return iscsit_add_reject_from_cmd(
2109 ISCSI_REASON_PROTOCOL_ERROR,
2110 1, 0, buf, cmd);
2111
2112 return 0;
2113 }
2114
2115 return iscsit_execute_cmd(cmd, 0);
2116 }
2117
2118 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2119 {
2120 struct iscsi_conn *conn_p;
2121 struct iscsi_session *sess = conn->sess;
2122
2123 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2124 " for SID: %u.\n", conn->cid, conn->sess->sid);
2125
2126 atomic_set(&sess->session_logout, 1);
2127 atomic_set(&conn->conn_logout_remove, 1);
2128 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2129
2130 iscsit_inc_conn_usage_count(conn);
2131 iscsit_inc_session_usage_count(sess);
2132
2133 spin_lock_bh(&sess->conn_lock);
2134 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2135 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2136 continue;
2137
2138 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2139 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2140 }
2141 spin_unlock_bh(&sess->conn_lock);
2142
2143 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2144
2145 return 0;
2146 }
2147
2148 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2149 {
2150 struct iscsi_conn *l_conn;
2151 struct iscsi_session *sess = conn->sess;
2152
2153 pr_debug("Received logout request CLOSECONNECTION for CID:"
2154 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2155
2156 /*
2157 * A Logout Request with a CLOSECONNECTION reason code for a CID
2158 * can arrive on a connection with a differing CID.
2159 */
2160 if (conn->cid == cmd->logout_cid) {
2161 spin_lock_bh(&conn->state_lock);
2162 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2163 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2164
2165 atomic_set(&conn->conn_logout_remove, 1);
2166 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2167 iscsit_inc_conn_usage_count(conn);
2168
2169 spin_unlock_bh(&conn->state_lock);
2170 } else {
2171 /*
2172 * Handle all different cid CLOSECONNECTION requests in
2173 * iscsit_logout_post_handler_diffcid() as to give enough
2174 * time for any non immediate command's CmdSN to be
2175 * acknowledged on the connection in question.
2176 *
2177 * Here we simply make sure the CID is still around.
2178 */
2179 l_conn = iscsit_get_conn_from_cid(sess,
2180 cmd->logout_cid);
2181 if (!l_conn) {
2182 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2183 iscsit_add_cmd_to_response_queue(cmd, conn,
2184 cmd->i_state);
2185 return 0;
2186 }
2187
2188 iscsit_dec_conn_usage_count(l_conn);
2189 }
2190
2191 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2192
2193 return 0;
2194 }
2195
2196 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2197 {
2198 struct iscsi_session *sess = conn->sess;
2199
2200 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2201 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2202
2203 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2204 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2205 " while ERL!=2.\n");
2206 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2207 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2208 return 0;
2209 }
2210
2211 if (conn->cid == cmd->logout_cid) {
2212 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2213 " with CID: %hu on CID: %hu, implementation error.\n",
2214 cmd->logout_cid, conn->cid);
2215 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2216 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2217 return 0;
2218 }
2219
2220 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2221
2222 return 0;
2223 }
2224
2225 int
2226 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2227 unsigned char *buf)
2228 {
2229 int cmdsn_ret, logout_remove = 0;
2230 u8 reason_code = 0;
2231 struct iscsi_logout *hdr;
2232 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2233
2234 hdr = (struct iscsi_logout *) buf;
2235 reason_code = (hdr->flags & 0x7f);
2236
2237 if (tiqn) {
2238 spin_lock(&tiqn->logout_stats.lock);
2239 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2240 tiqn->logout_stats.normal_logouts++;
2241 else
2242 tiqn->logout_stats.abnormal_logouts++;
2243 spin_unlock(&tiqn->logout_stats.lock);
2244 }
2245
2246 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2247 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2248 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2249 hdr->cid, conn->cid);
2250
2251 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2252 pr_err("Received logout request on connection that"
2253 " is not in logged in state, ignoring request.\n");
2254 iscsit_release_cmd(cmd);
2255 return 0;
2256 }
2257
2258 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2259 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2260 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2261 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2262 cmd->targ_xfer_tag = 0xFFFFFFFF;
2263 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2264 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2265 cmd->logout_cid = be16_to_cpu(hdr->cid);
2266 cmd->logout_reason = reason_code;
2267 cmd->data_direction = DMA_NONE;
2268
2269 /*
2270 * We need to sleep in these cases (by returning 1) until the Logout
2271 * Response gets sent in the tx thread.
2272 */
2273 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2274 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2275 be16_to_cpu(hdr->cid) == conn->cid))
2276 logout_remove = 1;
2277
2278 spin_lock_bh(&conn->cmd_lock);
2279 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2280 spin_unlock_bh(&conn->cmd_lock);
2281
2282 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2283 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2284
2285 /*
2286 * Immediate commands are executed, well, immediately.
2287 * Non-Immediate Logout Commands are executed in CmdSN order.
2288 */
2289 if (cmd->immediate_cmd) {
2290 int ret = iscsit_execute_cmd(cmd, 0);
2291
2292 if (ret < 0)
2293 return ret;
2294 } else {
2295 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2296 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2297 logout_remove = 0;
2298 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2299 return iscsit_add_reject_from_cmd(
2300 ISCSI_REASON_PROTOCOL_ERROR,
2301 1, 0, buf, cmd);
2302 }
2303 }
2304
2305 return logout_remove;
2306 }
2307 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2308
2309 static int iscsit_handle_snack(
2310 struct iscsi_conn *conn,
2311 unsigned char *buf)
2312 {
2313 struct iscsi_snack *hdr;
2314
2315 hdr = (struct iscsi_snack *) buf;
2316 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2317
2318 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2319 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2320 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2321 hdr->begrun, hdr->runlength, conn->cid);
2322
2323 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2324 pr_err("Initiator sent SNACK request while in"
2325 " ErrorRecoveryLevel=0.\n");
2326 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2327 buf, conn);
2328 }
2329 /*
2330 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2331 * call from inside iscsi_send_recovery_datain_or_r2t().
2332 */
2333 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2334 case 0:
2335 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2336 hdr->itt,
2337 be32_to_cpu(hdr->ttt),
2338 be32_to_cpu(hdr->begrun),
2339 be32_to_cpu(hdr->runlength));
2340 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2341 return iscsit_handle_status_snack(conn, hdr->itt,
2342 be32_to_cpu(hdr->ttt),
2343 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2344 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2345 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2346 be32_to_cpu(hdr->begrun),
2347 be32_to_cpu(hdr->runlength));
2348 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2349 /* FIXME: Support R-Data SNACK */
2350 pr_err("R-Data SNACK Not Supported.\n");
2351 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2352 buf, conn);
2353 default:
2354 pr_err("Unknown SNACK type 0x%02x, protocol"
2355 " error.\n", hdr->flags & 0x0f);
2356 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2357 buf, conn);
2358 }
2359
2360 return 0;
2361 }
2362
2363 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2364 {
2365 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2366 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2367 wait_for_completion_interruptible_timeout(
2368 &conn->rx_half_close_comp,
2369 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2370 }
2371 }
2372
2373 static int iscsit_handle_immediate_data(
2374 struct iscsi_cmd *cmd,
2375 struct iscsi_scsi_req *hdr,
2376 u32 length)
2377 {
2378 int iov_ret, rx_got = 0, rx_size = 0;
2379 u32 checksum, iov_count = 0, padding = 0;
2380 struct iscsi_conn *conn = cmd->conn;
2381 struct kvec *iov;
2382
2383 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2384 if (iov_ret < 0)
2385 return IMMEDIATE_DATA_CANNOT_RECOVER;
2386
2387 rx_size = length;
2388 iov_count = iov_ret;
2389 iov = &cmd->iov_data[0];
2390
2391 padding = ((-length) & 3);
2392 if (padding != 0) {
2393 iov[iov_count].iov_base = cmd->pad_bytes;
2394 iov[iov_count++].iov_len = padding;
2395 rx_size += padding;
2396 }
2397
2398 if (conn->conn_ops->DataDigest) {
2399 iov[iov_count].iov_base = &checksum;
2400 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2401 rx_size += ISCSI_CRC_LEN;
2402 }
2403
2404 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2405
2406 iscsit_unmap_iovec(cmd);
2407
2408 if (rx_got != rx_size) {
2409 iscsit_rx_thread_wait_for_tcp(conn);
2410 return IMMEDIATE_DATA_CANNOT_RECOVER;
2411 }
2412
2413 if (conn->conn_ops->DataDigest) {
2414 u32 data_crc;
2415
2416 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2417 cmd->write_data_done, length, padding,
2418 cmd->pad_bytes);
2419
2420 if (checksum != data_crc) {
2421 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2422 " does not match computed 0x%08x\n", checksum,
2423 data_crc);
2424
2425 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2426 pr_err("Unable to recover from"
2427 " Immediate Data digest failure while"
2428 " in ERL=0.\n");
2429 iscsit_add_reject_from_cmd(
2430 ISCSI_REASON_DATA_DIGEST_ERROR,
2431 1, 0, (unsigned char *)hdr, cmd);
2432 return IMMEDIATE_DATA_CANNOT_RECOVER;
2433 } else {
2434 iscsit_add_reject_from_cmd(
2435 ISCSI_REASON_DATA_DIGEST_ERROR,
2436 0, 0, (unsigned char *)hdr, cmd);
2437 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2438 }
2439 } else {
2440 pr_debug("Got CRC32C DataDigest 0x%08x for"
2441 " %u bytes of Immediate Data\n", checksum,
2442 length);
2443 }
2444 }
2445
2446 cmd->write_data_done += length;
2447
2448 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2449 spin_lock_bh(&cmd->istate_lock);
2450 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2451 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2452 spin_unlock_bh(&cmd->istate_lock);
2453 }
2454
2455 return IMMEDIATE_DATA_NORMAL_OPERATION;
2456 }
2457
2458 /*
2459 * Called with sess->conn_lock held.
2460 */
2461 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2462 with active network interface */
2463 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2464 {
2465 struct iscsi_cmd *cmd;
2466 struct iscsi_conn *conn_p;
2467
2468 /*
2469 * Only send a Asynchronous Message on connections whos network
2470 * interface is still functional.
2471 */
2472 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2473 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2474 iscsit_inc_conn_usage_count(conn_p);
2475 break;
2476 }
2477 }
2478
2479 if (!conn_p)
2480 return;
2481
2482 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
2483 if (!cmd) {
2484 iscsit_dec_conn_usage_count(conn_p);
2485 return;
2486 }
2487
2488 cmd->logout_cid = conn->cid;
2489 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2490 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2491
2492 spin_lock_bh(&conn_p->cmd_lock);
2493 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2494 spin_unlock_bh(&conn_p->cmd_lock);
2495
2496 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2497 iscsit_dec_conn_usage_count(conn_p);
2498 }
2499
2500 static int iscsit_send_conn_drop_async_message(
2501 struct iscsi_cmd *cmd,
2502 struct iscsi_conn *conn)
2503 {
2504 struct iscsi_async *hdr;
2505
2506 cmd->tx_size = ISCSI_HDR_LEN;
2507 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2508
2509 hdr = (struct iscsi_async *) cmd->pdu;
2510 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2511 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2512 cmd->init_task_tag = RESERVED_ITT;
2513 cmd->targ_xfer_tag = 0xFFFFFFFF;
2514 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2515 cmd->stat_sn = conn->stat_sn++;
2516 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2517 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2518 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2519 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2520 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2521 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2522 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2523
2524 if (conn->conn_ops->HeaderDigest) {
2525 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2526
2527 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2528 (unsigned char *)hdr, ISCSI_HDR_LEN,
2529 0, NULL, (u8 *)header_digest);
2530
2531 cmd->tx_size += ISCSI_CRC_LEN;
2532 pr_debug("Attaching CRC32C HeaderDigest to"
2533 " Async Message 0x%08x\n", *header_digest);
2534 }
2535
2536 cmd->iov_misc[0].iov_base = cmd->pdu;
2537 cmd->iov_misc[0].iov_len = cmd->tx_size;
2538 cmd->iov_misc_count = 1;
2539
2540 pr_debug("Sending Connection Dropped Async Message StatSN:"
2541 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2542 cmd->logout_cid, conn->cid);
2543 return 0;
2544 }
2545
2546 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2547 {
2548 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2549 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2550 wait_for_completion_interruptible_timeout(
2551 &conn->tx_half_close_comp,
2552 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2553 }
2554 }
2555
2556 static void
2557 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2558 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2559 bool set_statsn)
2560 {
2561 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2562 hdr->flags = datain->flags;
2563 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2564 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2565 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2566 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2567 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2568 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2569 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2570 }
2571 }
2572 hton24(hdr->dlength, datain->length);
2573 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2574 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2575 (struct scsi_lun *)&hdr->lun);
2576 else
2577 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2578
2579 hdr->itt = cmd->init_task_tag;
2580
2581 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2582 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2583 else
2584 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2585 if (set_statsn)
2586 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2587 else
2588 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2589
2590 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2591 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2592 hdr->datasn = cpu_to_be32(datain->data_sn);
2593 hdr->offset = cpu_to_be32(datain->offset);
2594
2595 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2596 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2597 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2598 ntohl(hdr->offset), datain->length, conn->cid);
2599 }
2600
2601 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2602 {
2603 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2604 struct iscsi_datain datain;
2605 struct iscsi_datain_req *dr;
2606 struct kvec *iov;
2607 u32 iov_count = 0, tx_size = 0;
2608 int eodr = 0, ret, iov_ret;
2609 bool set_statsn = false;
2610
2611 memset(&datain, 0, sizeof(struct iscsi_datain));
2612 dr = iscsit_get_datain_values(cmd, &datain);
2613 if (!dr) {
2614 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2615 cmd->init_task_tag);
2616 return -1;
2617 }
2618 /*
2619 * Be paranoid and double check the logic for now.
2620 */
2621 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2622 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2623 " datain.length: %u exceeds cmd->data_length: %u\n",
2624 cmd->init_task_tag, datain.offset, datain.length,
2625 cmd->se_cmd.data_length);
2626 return -1;
2627 }
2628
2629 spin_lock_bh(&conn->sess->session_stats_lock);
2630 conn->sess->tx_data_octets += datain.length;
2631 if (conn->sess->se_sess->se_node_acl) {
2632 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2633 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2634 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2635 }
2636 spin_unlock_bh(&conn->sess->session_stats_lock);
2637 /*
2638 * Special case for successfully execution w/ both DATAIN
2639 * and Sense Data.
2640 */
2641 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2642 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2643 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2644 else {
2645 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2646 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2647 iscsit_increment_maxcmdsn(cmd, conn->sess);
2648 cmd->stat_sn = conn->stat_sn++;
2649 set_statsn = true;
2650 } else if (dr->dr_complete ==
2651 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2652 set_statsn = true;
2653 }
2654
2655 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2656
2657 iov = &cmd->iov_data[0];
2658 iov[iov_count].iov_base = cmd->pdu;
2659 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2660 tx_size += ISCSI_HDR_LEN;
2661
2662 if (conn->conn_ops->HeaderDigest) {
2663 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2664
2665 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2666 (unsigned char *)cmd->pdu, ISCSI_HDR_LEN,
2667 0, NULL, (u8 *)header_digest);
2668
2669 iov[0].iov_len += ISCSI_CRC_LEN;
2670 tx_size += ISCSI_CRC_LEN;
2671
2672 pr_debug("Attaching CRC32 HeaderDigest"
2673 " for DataIN PDU 0x%08x\n", *header_digest);
2674 }
2675
2676 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2677 datain.offset, datain.length);
2678 if (iov_ret < 0)
2679 return -1;
2680
2681 iov_count += iov_ret;
2682 tx_size += datain.length;
2683
2684 cmd->padding = ((-datain.length) & 3);
2685 if (cmd->padding) {
2686 iov[iov_count].iov_base = cmd->pad_bytes;
2687 iov[iov_count++].iov_len = cmd->padding;
2688 tx_size += cmd->padding;
2689
2690 pr_debug("Attaching %u padding bytes\n",
2691 cmd->padding);
2692 }
2693 if (conn->conn_ops->DataDigest) {
2694 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2695 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2696
2697 iov[iov_count].iov_base = &cmd->data_crc;
2698 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2699 tx_size += ISCSI_CRC_LEN;
2700
2701 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2702 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2703 }
2704
2705 cmd->iov_data_count = iov_count;
2706 cmd->tx_size = tx_size;
2707
2708 /* sendpage is preferred but can't insert markers */
2709 if (!conn->conn_ops->IFMarker)
2710 ret = iscsit_fe_sendpage_sg(cmd, conn);
2711 else
2712 ret = iscsit_send_tx_data(cmd, conn, 0);
2713
2714 iscsit_unmap_iovec(cmd);
2715
2716 if (ret < 0) {
2717 iscsit_tx_thread_wait_for_tcp(conn);
2718 return ret;
2719 }
2720
2721 if (dr->dr_complete) {
2722 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2723 2 : 1;
2724 iscsit_free_datain_req(cmd, dr);
2725 }
2726
2727 return eodr;
2728 }
2729
2730 int
2731 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2732 struct iscsi_logout_rsp *hdr)
2733 {
2734 struct iscsi_conn *logout_conn = NULL;
2735 struct iscsi_conn_recovery *cr = NULL;
2736 struct iscsi_session *sess = conn->sess;
2737 /*
2738 * The actual shutting down of Sessions and/or Connections
2739 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2740 * is done in scsi_logout_post_handler().
2741 */
2742 switch (cmd->logout_reason) {
2743 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2744 pr_debug("iSCSI session logout successful, setting"
2745 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2746 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2747 break;
2748 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2749 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2750 break;
2751 /*
2752 * For CLOSECONNECTION logout requests carrying
2753 * a matching logout CID -> local CID, the reference
2754 * for the local CID will have been incremented in
2755 * iscsi_logout_closeconnection().
2756 *
2757 * For CLOSECONNECTION logout requests carrying
2758 * a different CID than the connection it arrived
2759 * on, the connection responding to cmd->logout_cid
2760 * is stopped in iscsit_logout_post_handler_diffcid().
2761 */
2762
2763 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2764 " successful.\n", cmd->logout_cid, conn->cid);
2765 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2766 break;
2767 case ISCSI_LOGOUT_REASON_RECOVERY:
2768 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2769 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2770 break;
2771 /*
2772 * If the connection is still active from our point of view
2773 * force connection recovery to occur.
2774 */
2775 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2776 cmd->logout_cid);
2777 if (logout_conn) {
2778 iscsit_connection_reinstatement_rcfr(logout_conn);
2779 iscsit_dec_conn_usage_count(logout_conn);
2780 }
2781
2782 cr = iscsit_get_inactive_connection_recovery_entry(
2783 conn->sess, cmd->logout_cid);
2784 if (!cr) {
2785 pr_err("Unable to locate CID: %hu for"
2786 " REMOVECONNFORRECOVERY Logout Request.\n",
2787 cmd->logout_cid);
2788 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2789 break;
2790 }
2791
2792 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2793
2794 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2795 " for recovery for CID: %hu on CID: %hu successful.\n",
2796 cmd->logout_cid, conn->cid);
2797 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2798 break;
2799 default:
2800 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2801 cmd->logout_reason);
2802 return -1;
2803 }
2804
2805 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2806 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2807 hdr->response = cmd->logout_response;
2808 hdr->itt = cmd->init_task_tag;
2809 cmd->stat_sn = conn->stat_sn++;
2810 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2811
2812 iscsit_increment_maxcmdsn(cmd, conn->sess);
2813 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2814 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2815
2816 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2817 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2818 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2819 cmd->logout_cid, conn->cid);
2820
2821 return 0;
2822 }
2823 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2824
2825 static int
2826 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2827 {
2828 struct kvec *iov;
2829 int niov = 0, tx_size, rc;
2830
2831 rc = iscsit_build_logout_rsp(cmd, conn,
2832 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2833 if (rc < 0)
2834 return rc;
2835
2836 tx_size = ISCSI_HDR_LEN;
2837 iov = &cmd->iov_misc[0];
2838 iov[niov].iov_base = cmd->pdu;
2839 iov[niov++].iov_len = ISCSI_HDR_LEN;
2840
2841 if (conn->conn_ops->HeaderDigest) {
2842 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2843
2844 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2845 (unsigned char *)&cmd->pdu[0], ISCSI_HDR_LEN,
2846 0, NULL, (u8 *)header_digest);
2847
2848 iov[0].iov_len += ISCSI_CRC_LEN;
2849 tx_size += ISCSI_CRC_LEN;
2850 pr_debug("Attaching CRC32C HeaderDigest to"
2851 " Logout Response 0x%08x\n", *header_digest);
2852 }
2853 cmd->iov_misc_count = niov;
2854 cmd->tx_size = tx_size;
2855
2856 return 0;
2857 }
2858
2859 void
2860 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2861 struct iscsi_nopin *hdr, bool nopout_response)
2862 {
2863 hdr->opcode = ISCSI_OP_NOOP_IN;
2864 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2865 hton24(hdr->dlength, cmd->buf_ptr_size);
2866 if (nopout_response)
2867 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2868 hdr->itt = cmd->init_task_tag;
2869 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2870 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2871 conn->stat_sn;
2872 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2873
2874 if (nopout_response)
2875 iscsit_increment_maxcmdsn(cmd, conn->sess);
2876
2877 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2878 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2879
2880 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2881 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2882 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2883 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2884 }
2885 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2886
2887 /*
2888 * Unsolicited NOPIN, either requesting a response or not.
2889 */
2890 static int iscsit_send_unsolicited_nopin(
2891 struct iscsi_cmd *cmd,
2892 struct iscsi_conn *conn,
2893 int want_response)
2894 {
2895 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2896 int tx_size = ISCSI_HDR_LEN, ret;
2897
2898 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2899
2900 if (conn->conn_ops->HeaderDigest) {
2901 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2902
2903 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2904 (unsigned char *)hdr, ISCSI_HDR_LEN,
2905 0, NULL, (u8 *)header_digest);
2906
2907 tx_size += ISCSI_CRC_LEN;
2908 pr_debug("Attaching CRC32C HeaderDigest to"
2909 " NopIN 0x%08x\n", *header_digest);
2910 }
2911
2912 cmd->iov_misc[0].iov_base = cmd->pdu;
2913 cmd->iov_misc[0].iov_len = tx_size;
2914 cmd->iov_misc_count = 1;
2915 cmd->tx_size = tx_size;
2916
2917 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2918 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2919
2920 ret = iscsit_send_tx_data(cmd, conn, 1);
2921 if (ret < 0) {
2922 iscsit_tx_thread_wait_for_tcp(conn);
2923 return ret;
2924 }
2925
2926 spin_lock_bh(&cmd->istate_lock);
2927 cmd->i_state = want_response ?
2928 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2929 spin_unlock_bh(&cmd->istate_lock);
2930
2931 return 0;
2932 }
2933
2934 static int
2935 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2936 {
2937 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2938 struct kvec *iov;
2939 u32 padding = 0;
2940 int niov = 0, tx_size;
2941
2942 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2943
2944 tx_size = ISCSI_HDR_LEN;
2945 iov = &cmd->iov_misc[0];
2946 iov[niov].iov_base = cmd->pdu;
2947 iov[niov++].iov_len = ISCSI_HDR_LEN;
2948
2949 if (conn->conn_ops->HeaderDigest) {
2950 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2951
2952 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2953 (unsigned char *)hdr, ISCSI_HDR_LEN,
2954 0, NULL, (u8 *)header_digest);
2955
2956 iov[0].iov_len += ISCSI_CRC_LEN;
2957 tx_size += ISCSI_CRC_LEN;
2958 pr_debug("Attaching CRC32C HeaderDigest"
2959 " to NopIn 0x%08x\n", *header_digest);
2960 }
2961
2962 /*
2963 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2964 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2965 */
2966 if (cmd->buf_ptr_size) {
2967 iov[niov].iov_base = cmd->buf_ptr;
2968 iov[niov++].iov_len = cmd->buf_ptr_size;
2969 tx_size += cmd->buf_ptr_size;
2970
2971 pr_debug("Echoing back %u bytes of ping"
2972 " data.\n", cmd->buf_ptr_size);
2973
2974 padding = ((-cmd->buf_ptr_size) & 3);
2975 if (padding != 0) {
2976 iov[niov].iov_base = &cmd->pad_bytes;
2977 iov[niov++].iov_len = padding;
2978 tx_size += padding;
2979 pr_debug("Attaching %u additional"
2980 " padding bytes.\n", padding);
2981 }
2982 if (conn->conn_ops->DataDigest) {
2983 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2984 cmd->buf_ptr, cmd->buf_ptr_size,
2985 padding, (u8 *)&cmd->pad_bytes,
2986 (u8 *)&cmd->data_crc);
2987
2988 iov[niov].iov_base = &cmd->data_crc;
2989 iov[niov++].iov_len = ISCSI_CRC_LEN;
2990 tx_size += ISCSI_CRC_LEN;
2991 pr_debug("Attached DataDigest for %u"
2992 " bytes of ping data, CRC 0x%08x\n",
2993 cmd->buf_ptr_size, cmd->data_crc);
2994 }
2995 }
2996
2997 cmd->iov_misc_count = niov;
2998 cmd->tx_size = tx_size;
2999
3000 return 0;
3001 }
3002
3003 static int iscsit_send_r2t(
3004 struct iscsi_cmd *cmd,
3005 struct iscsi_conn *conn)
3006 {
3007 int tx_size = 0;
3008 struct iscsi_r2t *r2t;
3009 struct iscsi_r2t_rsp *hdr;
3010 int ret;
3011
3012 r2t = iscsit_get_r2t_from_list(cmd);
3013 if (!r2t)
3014 return -1;
3015
3016 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3017 memset(hdr, 0, ISCSI_HDR_LEN);
3018 hdr->opcode = ISCSI_OP_R2T;
3019 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3020 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3021 (struct scsi_lun *)&hdr->lun);
3022 hdr->itt = cmd->init_task_tag;
3023 spin_lock_bh(&conn->sess->ttt_lock);
3024 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3025 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3026 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3027 spin_unlock_bh(&conn->sess->ttt_lock);
3028 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3029 hdr->statsn = cpu_to_be32(conn->stat_sn);
3030 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3031 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3032 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3033 hdr->data_offset = cpu_to_be32(r2t->offset);
3034 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3035
3036 cmd->iov_misc[0].iov_base = cmd->pdu;
3037 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3038 tx_size += ISCSI_HDR_LEN;
3039
3040 if (conn->conn_ops->HeaderDigest) {
3041 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3042
3043 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3044 (unsigned char *)hdr, ISCSI_HDR_LEN,
3045 0, NULL, (u8 *)header_digest);
3046
3047 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3048 tx_size += ISCSI_CRC_LEN;
3049 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3050 " PDU 0x%08x\n", *header_digest);
3051 }
3052
3053 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3054 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3055 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3056 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3057 r2t->offset, r2t->xfer_len, conn->cid);
3058
3059 cmd->iov_misc_count = 1;
3060 cmd->tx_size = tx_size;
3061
3062 spin_lock_bh(&cmd->r2t_lock);
3063 r2t->sent_r2t = 1;
3064 spin_unlock_bh(&cmd->r2t_lock);
3065
3066 ret = iscsit_send_tx_data(cmd, conn, 1);
3067 if (ret < 0) {
3068 iscsit_tx_thread_wait_for_tcp(conn);
3069 return ret;
3070 }
3071
3072 spin_lock_bh(&cmd->dataout_timeout_lock);
3073 iscsit_start_dataout_timer(cmd, conn);
3074 spin_unlock_bh(&cmd->dataout_timeout_lock);
3075
3076 return 0;
3077 }
3078
3079 /*
3080 * @recovery: If called from iscsi_task_reassign_complete_write() for
3081 * connection recovery.
3082 */
3083 int iscsit_build_r2ts_for_cmd(
3084 struct iscsi_conn *conn,
3085 struct iscsi_cmd *cmd,
3086 bool recovery)
3087 {
3088 int first_r2t = 1;
3089 u32 offset = 0, xfer_len = 0;
3090
3091 spin_lock_bh(&cmd->r2t_lock);
3092 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3093 spin_unlock_bh(&cmd->r2t_lock);
3094 return 0;
3095 }
3096
3097 if (conn->sess->sess_ops->DataSequenceInOrder &&
3098 !recovery)
3099 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3100
3101 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3102 if (conn->sess->sess_ops->DataSequenceInOrder) {
3103 offset = cmd->r2t_offset;
3104
3105 if (first_r2t && recovery) {
3106 int new_data_end = offset +
3107 conn->sess->sess_ops->MaxBurstLength -
3108 cmd->next_burst_len;
3109
3110 if (new_data_end > cmd->se_cmd.data_length)
3111 xfer_len = cmd->se_cmd.data_length - offset;
3112 else
3113 xfer_len =
3114 conn->sess->sess_ops->MaxBurstLength -
3115 cmd->next_burst_len;
3116 } else {
3117 int new_data_end = offset +
3118 conn->sess->sess_ops->MaxBurstLength;
3119
3120 if (new_data_end > cmd->se_cmd.data_length)
3121 xfer_len = cmd->se_cmd.data_length - offset;
3122 else
3123 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3124 }
3125 cmd->r2t_offset += xfer_len;
3126
3127 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3128 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3129 } else {
3130 struct iscsi_seq *seq;
3131
3132 seq = iscsit_get_seq_holder_for_r2t(cmd);
3133 if (!seq) {
3134 spin_unlock_bh(&cmd->r2t_lock);
3135 return -1;
3136 }
3137
3138 offset = seq->offset;
3139 xfer_len = seq->xfer_len;
3140
3141 if (cmd->seq_send_order == cmd->seq_count)
3142 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3143 }
3144 cmd->outstanding_r2ts++;
3145 first_r2t = 0;
3146
3147 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3148 spin_unlock_bh(&cmd->r2t_lock);
3149 return -1;
3150 }
3151
3152 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3153 break;
3154 }
3155 spin_unlock_bh(&cmd->r2t_lock);
3156
3157 return 0;
3158 }
3159
3160 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3161 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3162 {
3163 if (inc_stat_sn)
3164 cmd->stat_sn = conn->stat_sn++;
3165
3166 spin_lock_bh(&conn->sess->session_stats_lock);
3167 conn->sess->rsp_pdus++;
3168 spin_unlock_bh(&conn->sess->session_stats_lock);
3169
3170 memset(hdr, 0, ISCSI_HDR_LEN);
3171 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3172 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3173 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3174 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3175 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3176 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3177 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3178 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3179 }
3180 hdr->response = cmd->iscsi_response;
3181 hdr->cmd_status = cmd->se_cmd.scsi_status;
3182 hdr->itt = cmd->init_task_tag;
3183 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3184
3185 iscsit_increment_maxcmdsn(cmd, conn->sess);
3186 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3187 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3188
3189 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3190 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3191 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3192 cmd->se_cmd.scsi_status, conn->cid);
3193 }
3194 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3195
3196 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3197 {
3198 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3199 struct kvec *iov;
3200 u32 padding = 0, tx_size = 0;
3201 int iov_count = 0;
3202 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3203
3204 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3205
3206 iov = &cmd->iov_misc[0];
3207 iov[iov_count].iov_base = cmd->pdu;
3208 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3209 tx_size += ISCSI_HDR_LEN;
3210
3211 /*
3212 * Attach SENSE DATA payload to iSCSI Response PDU
3213 */
3214 if (cmd->se_cmd.sense_buffer &&
3215 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3216 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3217 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3218 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3219
3220 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3221 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3222 iov[iov_count].iov_base = cmd->sense_buffer;
3223 iov[iov_count++].iov_len =
3224 (cmd->se_cmd.scsi_sense_length + padding);
3225 tx_size += cmd->se_cmd.scsi_sense_length;
3226
3227 if (padding) {
3228 memset(cmd->sense_buffer +
3229 cmd->se_cmd.scsi_sense_length, 0, padding);
3230 tx_size += padding;
3231 pr_debug("Adding %u bytes of padding to"
3232 " SENSE.\n", padding);
3233 }
3234
3235 if (conn->conn_ops->DataDigest) {
3236 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3237 cmd->sense_buffer,
3238 (cmd->se_cmd.scsi_sense_length + padding),
3239 0, NULL, (u8 *)&cmd->data_crc);
3240
3241 iov[iov_count].iov_base = &cmd->data_crc;
3242 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3243 tx_size += ISCSI_CRC_LEN;
3244
3245 pr_debug("Attaching CRC32 DataDigest for"
3246 " SENSE, %u bytes CRC 0x%08x\n",
3247 (cmd->se_cmd.scsi_sense_length + padding),
3248 cmd->data_crc);
3249 }
3250
3251 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3252 " Response PDU\n",
3253 cmd->se_cmd.scsi_sense_length);
3254 }
3255
3256 if (conn->conn_ops->HeaderDigest) {
3257 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3258
3259 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3260 (unsigned char *)cmd->pdu, ISCSI_HDR_LEN,
3261 0, NULL, (u8 *)header_digest);
3262
3263 iov[0].iov_len += ISCSI_CRC_LEN;
3264 tx_size += ISCSI_CRC_LEN;
3265 pr_debug("Attaching CRC32 HeaderDigest for Response"
3266 " PDU 0x%08x\n", *header_digest);
3267 }
3268
3269 cmd->iov_misc_count = iov_count;
3270 cmd->tx_size = tx_size;
3271
3272 return 0;
3273 }
3274
3275 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3276 {
3277 switch (se_tmr->response) {
3278 case TMR_FUNCTION_COMPLETE:
3279 return ISCSI_TMF_RSP_COMPLETE;
3280 case TMR_TASK_DOES_NOT_EXIST:
3281 return ISCSI_TMF_RSP_NO_TASK;
3282 case TMR_LUN_DOES_NOT_EXIST:
3283 return ISCSI_TMF_RSP_NO_LUN;
3284 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3285 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3286 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3287 return ISCSI_TMF_RSP_AUTH_FAILED;
3288 case TMR_FUNCTION_REJECTED:
3289 default:
3290 return ISCSI_TMF_RSP_REJECTED;
3291 }
3292 }
3293
3294 void
3295 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3296 struct iscsi_tm_rsp *hdr)
3297 {
3298 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3299
3300 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3301 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3302 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3303 hdr->itt = cmd->init_task_tag;
3304 cmd->stat_sn = conn->stat_sn++;
3305 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3306
3307 iscsit_increment_maxcmdsn(cmd, conn->sess);
3308 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3309 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3310
3311 pr_debug("Built Task Management Response ITT: 0x%08x,"
3312 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3313 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3314 }
3315 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3316
3317 static int
3318 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3319 {
3320 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3321 u32 tx_size = 0;
3322
3323 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3324
3325 cmd->iov_misc[0].iov_base = cmd->pdu;
3326 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3327 tx_size += ISCSI_HDR_LEN;
3328
3329 if (conn->conn_ops->HeaderDigest) {
3330 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3331
3332 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3333 (unsigned char *)hdr, ISCSI_HDR_LEN,
3334 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
3384 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3385 SENDTARGETS_BUF_LIMIT);
3386
3387 payload = kzalloc(buffer_len, GFP_KERNEL);
3388 if (!payload) {
3389 pr_err("Unable to allocate memory for sendtargets"
3390 " response.\n");
3391 return -ENOMEM;
3392 }
3393
3394 spin_lock(&tiqn_lock);
3395 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3396 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3397 len += 1;
3398
3399 if ((len + payload_len) > buffer_len) {
3400 end_of_buf = 1;
3401 goto eob;
3402 }
3403 memcpy(payload + payload_len, buf, len);
3404 payload_len += len;
3405
3406 spin_lock(&tiqn->tiqn_tpg_lock);
3407 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3408
3409 spin_lock(&tpg->tpg_state_lock);
3410 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3411 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3412 spin_unlock(&tpg->tpg_state_lock);
3413 continue;
3414 }
3415 spin_unlock(&tpg->tpg_state_lock);
3416
3417 spin_lock(&tpg->tpg_np_lock);
3418 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3419 tpg_np_list) {
3420 struct iscsi_np *np = tpg_np->tpg_np;
3421 bool inaddr_any = iscsit_check_inaddr_any(np);
3422
3423 len = sprintf(buf, "TargetAddress="
3424 "%s%s%s:%hu,%hu",
3425 (np->np_sockaddr.ss_family == AF_INET6) ?
3426 "[" : "", (inaddr_any == false) ?
3427 np->np_ip : conn->local_ip,
3428 (np->np_sockaddr.ss_family == AF_INET6) ?
3429 "]" : "", (inaddr_any == false) ?
3430 np->np_port : conn->local_port,
3431 tpg->tpgt);
3432 len += 1;
3433
3434 if ((len + payload_len) > buffer_len) {
3435 spin_unlock(&tpg->tpg_np_lock);
3436 spin_unlock(&tiqn->tiqn_tpg_lock);
3437 end_of_buf = 1;
3438 goto eob;
3439 }
3440 memcpy(payload + payload_len, buf, len);
3441 payload_len += len;
3442 }
3443 spin_unlock(&tpg->tpg_np_lock);
3444 }
3445 spin_unlock(&tiqn->tiqn_tpg_lock);
3446 eob:
3447 if (end_of_buf)
3448 break;
3449 }
3450 spin_unlock(&tiqn_lock);
3451
3452 cmd->buf_ptr = payload;
3453
3454 return payload_len;
3455 }
3456
3457 /*
3458 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3459 * MaxRecvDataSegmentLength.
3460 */
3461 static int iscsit_send_text_rsp(
3462 struct iscsi_cmd *cmd,
3463 struct iscsi_conn *conn)
3464 {
3465 struct iscsi_text_rsp *hdr;
3466 struct kvec *iov;
3467 u32 padding = 0, tx_size = 0;
3468 int text_length, iov_count = 0;
3469
3470 text_length = iscsit_build_sendtargets_response(cmd);
3471 if (text_length < 0)
3472 return text_length;
3473
3474 padding = ((-text_length) & 3);
3475 if (padding != 0) {
3476 memset(cmd->buf_ptr + text_length, 0, padding);
3477 pr_debug("Attaching %u additional bytes for"
3478 " padding.\n", padding);
3479 }
3480
3481 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3482 memset(hdr, 0, ISCSI_HDR_LEN);
3483 hdr->opcode = ISCSI_OP_TEXT_RSP;
3484 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3485 hton24(hdr->dlength, text_length);
3486 hdr->itt = cmd->init_task_tag;
3487 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3488 cmd->stat_sn = conn->stat_sn++;
3489 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3490
3491 iscsit_increment_maxcmdsn(cmd, conn->sess);
3492 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3493 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3494
3495 iov = &cmd->iov_misc[0];
3496
3497 iov[iov_count].iov_base = cmd->pdu;
3498 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3499 iov[iov_count].iov_base = cmd->buf_ptr;
3500 iov[iov_count++].iov_len = text_length + padding;
3501
3502 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3503
3504 if (conn->conn_ops->HeaderDigest) {
3505 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3506
3507 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3508 (unsigned char *)hdr, ISCSI_HDR_LEN,
3509 0, NULL, (u8 *)header_digest);
3510
3511 iov[0].iov_len += ISCSI_CRC_LEN;
3512 tx_size += ISCSI_CRC_LEN;
3513 pr_debug("Attaching CRC32 HeaderDigest for"
3514 " Text Response PDU 0x%08x\n", *header_digest);
3515 }
3516
3517 if (conn->conn_ops->DataDigest) {
3518 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3519 cmd->buf_ptr, (text_length + padding),
3520 0, NULL, (u8 *)&cmd->data_crc);
3521
3522 iov[iov_count].iov_base = &cmd->data_crc;
3523 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3524 tx_size += ISCSI_CRC_LEN;
3525
3526 pr_debug("Attaching DataDigest for %u bytes of text"
3527 " data, CRC 0x%08x\n", (text_length + padding),
3528 cmd->data_crc);
3529 }
3530
3531 cmd->iov_misc_count = iov_count;
3532 cmd->tx_size = tx_size;
3533
3534 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3535 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3536 text_length, conn->cid);
3537 return 0;
3538 }
3539
3540 void
3541 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3542 struct iscsi_reject *hdr)
3543 {
3544 hdr->opcode = ISCSI_OP_REJECT;
3545 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3546 hton24(hdr->dlength, ISCSI_HDR_LEN);
3547 hdr->ffffffff = cpu_to_be32(0xffffffff);
3548 cmd->stat_sn = conn->stat_sn++;
3549 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3550 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3551 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3552
3553 }
3554 EXPORT_SYMBOL(iscsit_build_reject);
3555
3556 static int iscsit_send_reject(
3557 struct iscsi_cmd *cmd,
3558 struct iscsi_conn *conn)
3559 {
3560 u32 iov_count = 0, tx_size = 0;
3561 struct iscsi_reject *hdr;
3562 struct kvec *iov;
3563
3564 iscsit_build_reject(cmd, conn, (struct iscsi_reject *)&cmd->pdu[0]);
3565
3566 iov = &cmd->iov_misc[0];
3567 iov[iov_count].iov_base = cmd->pdu;
3568 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3569 iov[iov_count].iov_base = cmd->buf_ptr;
3570 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3571
3572 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3573
3574 if (conn->conn_ops->HeaderDigest) {
3575 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3576
3577 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3578 (unsigned char *)hdr, ISCSI_HDR_LEN,
3579 0, NULL, (u8 *)header_digest);
3580
3581 iov[0].iov_len += ISCSI_CRC_LEN;
3582 tx_size += ISCSI_CRC_LEN;
3583 pr_debug("Attaching CRC32 HeaderDigest for"
3584 " REJECT PDU 0x%08x\n", *header_digest);
3585 }
3586
3587 if (conn->conn_ops->DataDigest) {
3588 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3589 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3590 0, NULL, (u8 *)&cmd->data_crc);
3591
3592 iov[iov_count].iov_base = &cmd->data_crc;
3593 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3594 tx_size += ISCSI_CRC_LEN;
3595 pr_debug("Attaching CRC32 DataDigest for REJECT"
3596 " PDU 0x%08x\n", cmd->data_crc);
3597 }
3598
3599 cmd->iov_misc_count = iov_count;
3600 cmd->tx_size = tx_size;
3601
3602 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3603 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3604
3605 return 0;
3606 }
3607
3608 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3609 {
3610 struct iscsi_thread_set *ts = conn->thread_set;
3611 int ord, cpu;
3612 /*
3613 * thread_id is assigned from iscsit_global->ts_bitmap from
3614 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3615 *
3616 * Here we use thread_id to determine which CPU that this
3617 * iSCSI connection's iscsi_thread_set will be scheduled to
3618 * execute upon.
3619 */
3620 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3621 for_each_online_cpu(cpu) {
3622 if (ord-- == 0) {
3623 cpumask_set_cpu(cpu, conn->conn_cpumask);
3624 return;
3625 }
3626 }
3627 /*
3628 * This should never be reached..
3629 */
3630 dump_stack();
3631 cpumask_setall(conn->conn_cpumask);
3632 }
3633
3634 static inline void iscsit_thread_check_cpumask(
3635 struct iscsi_conn *conn,
3636 struct task_struct *p,
3637 int mode)
3638 {
3639 char buf[128];
3640 /*
3641 * mode == 1 signals iscsi_target_tx_thread() usage.
3642 * mode == 0 signals iscsi_target_rx_thread() usage.
3643 */
3644 if (mode == 1) {
3645 if (!conn->conn_tx_reset_cpumask)
3646 return;
3647 conn->conn_tx_reset_cpumask = 0;
3648 } else {
3649 if (!conn->conn_rx_reset_cpumask)
3650 return;
3651 conn->conn_rx_reset_cpumask = 0;
3652 }
3653 /*
3654 * Update the CPU mask for this single kthread so that
3655 * both TX and RX kthreads are scheduled to run on the
3656 * same CPU.
3657 */
3658 memset(buf, 0, 128);
3659 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3660 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3661 }
3662
3663 static int
3664 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3665 {
3666 int ret;
3667
3668 switch (state) {
3669 case ISTATE_SEND_R2T:
3670 ret = iscsit_send_r2t(cmd, conn);
3671 if (ret < 0)
3672 goto err;
3673 break;
3674 case ISTATE_REMOVE:
3675 spin_lock_bh(&conn->cmd_lock);
3676 list_del(&cmd->i_conn_node);
3677 spin_unlock_bh(&conn->cmd_lock);
3678
3679 iscsit_free_cmd(cmd);
3680 break;
3681 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3682 iscsit_mod_nopin_response_timer(conn);
3683 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3684 if (ret < 0)
3685 goto err;
3686 break;
3687 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3688 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3689 if (ret < 0)
3690 goto err;
3691 break;
3692 default:
3693 pr_err("Unknown Opcode: 0x%02x ITT:"
3694 " 0x%08x, i_state: %d on CID: %hu\n",
3695 cmd->iscsi_opcode, cmd->init_task_tag, state,
3696 conn->cid);
3697 goto err;
3698 }
3699
3700 return 0;
3701
3702 err:
3703 return -1;
3704 }
3705
3706 static int
3707 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3708 {
3709 struct iscsit_transport *t = conn->conn_transport;
3710 struct iscsi_queue_req *qr;
3711 struct iscsi_cmd *cmd;
3712 u8 state;
3713 int ret;
3714
3715 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3716 atomic_set(&conn->check_immediate_queue, 0);
3717 cmd = qr->cmd;
3718 state = qr->state;
3719 kmem_cache_free(lio_qr_cache, qr);
3720
3721 ret = t->iscsit_immediate_queue(conn, cmd, state);
3722 if (ret < 0)
3723 return ret;
3724 }
3725
3726 return 0;
3727 }
3728
3729 static int
3730 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3731 {
3732 int ret;
3733
3734 check_rsp_state:
3735 switch (state) {
3736 case ISTATE_SEND_DATAIN:
3737 ret = iscsit_send_datain(cmd, conn);
3738 if (ret < 0)
3739 goto err;
3740 else if (!ret)
3741 /* more drs */
3742 goto check_rsp_state;
3743 else if (ret == 1) {
3744 /* all done */
3745 spin_lock_bh(&cmd->istate_lock);
3746 cmd->i_state = ISTATE_SENT_STATUS;
3747 spin_unlock_bh(&cmd->istate_lock);
3748
3749 if (atomic_read(&conn->check_immediate_queue))
3750 return 1;
3751
3752 return 0;
3753 } else if (ret == 2) {
3754 /* Still must send status,
3755 SCF_TRANSPORT_TASK_SENSE was set */
3756 spin_lock_bh(&cmd->istate_lock);
3757 cmd->i_state = ISTATE_SEND_STATUS;
3758 spin_unlock_bh(&cmd->istate_lock);
3759 state = ISTATE_SEND_STATUS;
3760 goto check_rsp_state;
3761 }
3762
3763 break;
3764 case ISTATE_SEND_STATUS:
3765 case ISTATE_SEND_STATUS_RECOVERY:
3766 ret = iscsit_send_response(cmd, conn);
3767 break;
3768 case ISTATE_SEND_LOGOUTRSP:
3769 ret = iscsit_send_logout(cmd, conn);
3770 break;
3771 case ISTATE_SEND_ASYNCMSG:
3772 ret = iscsit_send_conn_drop_async_message(
3773 cmd, conn);
3774 break;
3775 case ISTATE_SEND_NOPIN:
3776 ret = iscsit_send_nopin(cmd, conn);
3777 break;
3778 case ISTATE_SEND_REJECT:
3779 ret = iscsit_send_reject(cmd, conn);
3780 break;
3781 case ISTATE_SEND_TASKMGTRSP:
3782 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3783 if (ret != 0)
3784 break;
3785 ret = iscsit_tmr_post_handler(cmd, conn);
3786 if (ret != 0)
3787 iscsit_fall_back_to_erl0(conn->sess);
3788 break;
3789 case ISTATE_SEND_TEXTRSP:
3790 ret = iscsit_send_text_rsp(cmd, conn);
3791 break;
3792 default:
3793 pr_err("Unknown Opcode: 0x%02x ITT:"
3794 " 0x%08x, i_state: %d on CID: %hu\n",
3795 cmd->iscsi_opcode, cmd->init_task_tag,
3796 state, conn->cid);
3797 goto err;
3798 }
3799 if (ret < 0)
3800 goto err;
3801
3802 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3803 iscsit_tx_thread_wait_for_tcp(conn);
3804 iscsit_unmap_iovec(cmd);
3805 goto err;
3806 }
3807 iscsit_unmap_iovec(cmd);
3808
3809 switch (state) {
3810 case ISTATE_SEND_LOGOUTRSP:
3811 if (!iscsit_logout_post_handler(cmd, conn))
3812 goto restart;
3813 /* fall through */
3814 case ISTATE_SEND_STATUS:
3815 case ISTATE_SEND_ASYNCMSG:
3816 case ISTATE_SEND_NOPIN:
3817 case ISTATE_SEND_STATUS_RECOVERY:
3818 case ISTATE_SEND_TEXTRSP:
3819 case ISTATE_SEND_TASKMGTRSP:
3820 spin_lock_bh(&cmd->istate_lock);
3821 cmd->i_state = ISTATE_SENT_STATUS;
3822 spin_unlock_bh(&cmd->istate_lock);
3823 break;
3824 case ISTATE_SEND_REJECT:
3825 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3826 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3827 complete(&cmd->reject_comp);
3828 goto err;
3829 }
3830 complete(&cmd->reject_comp);
3831 break;
3832 default:
3833 pr_err("Unknown Opcode: 0x%02x ITT:"
3834 " 0x%08x, i_state: %d on CID: %hu\n",
3835 cmd->iscsi_opcode, cmd->init_task_tag,
3836 cmd->i_state, conn->cid);
3837 goto err;
3838 }
3839
3840 if (atomic_read(&conn->check_immediate_queue))
3841 return 1;
3842
3843 return 0;
3844
3845 err:
3846 return -1;
3847 restart:
3848 return -EAGAIN;
3849 }
3850
3851 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3852 {
3853 struct iscsit_transport *t = conn->conn_transport;
3854 struct iscsi_queue_req *qr;
3855 struct iscsi_cmd *cmd;
3856 u8 state;
3857 int ret;
3858
3859 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3860 cmd = qr->cmd;
3861 state = qr->state;
3862 kmem_cache_free(lio_qr_cache, qr);
3863
3864 ret = t->iscsit_response_queue(conn, cmd, state);
3865 if (ret == 1 || ret < 0)
3866 return ret;
3867 }
3868
3869 return 0;
3870 }
3871
3872 int iscsi_target_tx_thread(void *arg)
3873 {
3874 int ret = 0;
3875 struct iscsi_conn *conn;
3876 struct iscsi_thread_set *ts = arg;
3877 /*
3878 * Allow ourselves to be interrupted by SIGINT so that a
3879 * connection recovery / failure event can be triggered externally.
3880 */
3881 allow_signal(SIGINT);
3882
3883 restart:
3884 conn = iscsi_tx_thread_pre_handler(ts);
3885 if (!conn)
3886 goto out;
3887
3888 ret = 0;
3889
3890 while (!kthread_should_stop()) {
3891 /*
3892 * Ensure that both TX and RX per connection kthreads
3893 * are scheduled to run on the same CPU.
3894 */
3895 iscsit_thread_check_cpumask(conn, current, 1);
3896
3897 wait_event_interruptible(conn->queues_wq,
3898 !iscsit_conn_all_queues_empty(conn) ||
3899 ts->status == ISCSI_THREAD_SET_RESET);
3900
3901 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3902 signal_pending(current))
3903 goto transport_err;
3904
3905 get_immediate:
3906 ret = iscsit_handle_immediate_queue(conn);
3907 if (ret < 0)
3908 goto transport_err;
3909
3910 ret = iscsit_handle_response_queue(conn);
3911 if (ret == 1)
3912 goto get_immediate;
3913 else if (ret == -EAGAIN)
3914 goto restart;
3915 else if (ret < 0)
3916 goto transport_err;
3917 }
3918
3919 transport_err:
3920 iscsit_take_action_for_connection_exit(conn);
3921 goto restart;
3922 out:
3923 return 0;
3924 }
3925
3926 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3927 {
3928 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3929 struct iscsi_cmd *cmd;
3930 int ret = 0;
3931
3932 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3933 case ISCSI_OP_SCSI_CMD:
3934 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3935 if (!cmd)
3936 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3937 1, buf, conn);
3938
3939 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3940 break;
3941 case ISCSI_OP_SCSI_DATA_OUT:
3942 ret = iscsit_handle_data_out(conn, buf);
3943 break;
3944 case ISCSI_OP_NOOP_OUT:
3945 cmd = NULL;
3946 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3947 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3948 if (!cmd)
3949 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3950 1, buf, conn);
3951 }
3952 ret = iscsit_handle_nop_out(conn, cmd, buf);
3953 break;
3954 case ISCSI_OP_SCSI_TMFUNC:
3955 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3956 if (!cmd)
3957 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3958 1, buf, conn);
3959
3960 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3961 break;
3962 case ISCSI_OP_TEXT:
3963 ret = iscsit_handle_text_cmd(conn, buf);
3964 break;
3965 case ISCSI_OP_LOGOUT:
3966 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3967 if (!cmd)
3968 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3969 1, buf, conn);
3970
3971 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3972 if (ret > 0)
3973 wait_for_completion_timeout(&conn->conn_logout_comp,
3974 SECONDS_FOR_LOGOUT_COMP * HZ);
3975 break;
3976 case ISCSI_OP_SNACK:
3977 ret = iscsit_handle_snack(conn, buf);
3978 break;
3979 default:
3980 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3981 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3982 pr_err("Cannot recover from unknown"
3983 " opcode while ERL=0, closing iSCSI connection.\n");
3984 return -1;
3985 }
3986 if (!conn->conn_ops->OFMarker) {
3987 pr_err("Unable to recover from unknown"
3988 " opcode while OFMarker=No, closing iSCSI"
3989 " connection.\n");
3990 return -1;
3991 }
3992 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3993 pr_err("Unable to recover from unknown"
3994 " opcode, closing iSCSI connection.\n");
3995 return -1;
3996 }
3997 break;
3998 }
3999
4000 return ret;
4001 }
4002
4003 int iscsi_target_rx_thread(void *arg)
4004 {
4005 int ret;
4006 u8 buffer[ISCSI_HDR_LEN], opcode;
4007 u32 checksum = 0, digest = 0;
4008 struct iscsi_conn *conn = NULL;
4009 struct iscsi_thread_set *ts = arg;
4010 struct kvec iov;
4011 /*
4012 * Allow ourselves to be interrupted by SIGINT so that a
4013 * connection recovery / failure event can be triggered externally.
4014 */
4015 allow_signal(SIGINT);
4016
4017 restart:
4018 conn = iscsi_rx_thread_pre_handler(ts);
4019 if (!conn)
4020 goto out;
4021
4022 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4023 struct completion comp;
4024 int rc;
4025
4026 init_completion(&comp);
4027 rc = wait_for_completion_interruptible(&comp);
4028 if (rc < 0)
4029 goto transport_err;
4030
4031 goto out;
4032 }
4033
4034 while (!kthread_should_stop()) {
4035 /*
4036 * Ensure that both TX and RX per connection kthreads
4037 * are scheduled to run on the same CPU.
4038 */
4039 iscsit_thread_check_cpumask(conn, current, 0);
4040
4041 memset(buffer, 0, ISCSI_HDR_LEN);
4042 memset(&iov, 0, sizeof(struct kvec));
4043
4044 iov.iov_base = buffer;
4045 iov.iov_len = ISCSI_HDR_LEN;
4046
4047 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4048 if (ret != ISCSI_HDR_LEN) {
4049 iscsit_rx_thread_wait_for_tcp(conn);
4050 goto transport_err;
4051 }
4052
4053 /*
4054 * Set conn->bad_hdr for use with REJECT PDUs.
4055 */
4056 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
4057
4058 if (conn->conn_ops->HeaderDigest) {
4059 iov.iov_base = &digest;
4060 iov.iov_len = ISCSI_CRC_LEN;
4061
4062 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4063 if (ret != ISCSI_CRC_LEN) {
4064 iscsit_rx_thread_wait_for_tcp(conn);
4065 goto transport_err;
4066 }
4067
4068 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4069 buffer, ISCSI_HDR_LEN,
4070 0, NULL, (u8 *)&checksum);
4071
4072 if (digest != checksum) {
4073 pr_err("HeaderDigest CRC32C failed,"
4074 " received 0x%08x, computed 0x%08x\n",
4075 digest, checksum);
4076 /*
4077 * Set the PDU to 0xff so it will intentionally
4078 * hit default in the switch below.
4079 */
4080 memset(buffer, 0xff, ISCSI_HDR_LEN);
4081 spin_lock_bh(&conn->sess->session_stats_lock);
4082 conn->sess->conn_digest_errors++;
4083 spin_unlock_bh(&conn->sess->session_stats_lock);
4084 } else {
4085 pr_debug("Got HeaderDigest CRC32C"
4086 " 0x%08x\n", checksum);
4087 }
4088 }
4089
4090 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4091 goto transport_err;
4092
4093 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4094
4095 if (conn->sess->sess_ops->SessionType &&
4096 ((!(opcode & ISCSI_OP_TEXT)) ||
4097 (!(opcode & ISCSI_OP_LOGOUT)))) {
4098 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4099 " while in Discovery Session, rejecting.\n", opcode);
4100 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
4101 buffer, conn);
4102 goto transport_err;
4103 }
4104
4105 ret = iscsi_target_rx_opcode(conn, buffer);
4106 if (ret < 0)
4107 goto transport_err;
4108 }
4109
4110 transport_err:
4111 if (!signal_pending(current))
4112 atomic_set(&conn->transport_failed, 1);
4113 iscsit_take_action_for_connection_exit(conn);
4114 goto restart;
4115 out:
4116 return 0;
4117 }
4118
4119 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4120 {
4121 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4122 struct iscsi_session *sess = conn->sess;
4123 /*
4124 * We expect this function to only ever be called from either RX or TX
4125 * thread context via iscsit_close_connection() once the other context
4126 * has been reset -> returned sleeping pre-handler state.
4127 */
4128 spin_lock_bh(&conn->cmd_lock);
4129 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4130
4131 list_del(&cmd->i_conn_node);
4132 spin_unlock_bh(&conn->cmd_lock);
4133
4134 iscsit_increment_maxcmdsn(cmd, sess);
4135
4136 iscsit_free_cmd(cmd);
4137
4138 spin_lock_bh(&conn->cmd_lock);
4139 }
4140 spin_unlock_bh(&conn->cmd_lock);
4141 }
4142
4143 static void iscsit_stop_timers_for_cmds(
4144 struct iscsi_conn *conn)
4145 {
4146 struct iscsi_cmd *cmd;
4147
4148 spin_lock_bh(&conn->cmd_lock);
4149 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4150 if (cmd->data_direction == DMA_TO_DEVICE)
4151 iscsit_stop_dataout_timer(cmd);
4152 }
4153 spin_unlock_bh(&conn->cmd_lock);
4154 }
4155
4156 int iscsit_close_connection(
4157 struct iscsi_conn *conn)
4158 {
4159 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4160 struct iscsi_session *sess = conn->sess;
4161
4162 pr_debug("Closing iSCSI connection CID %hu on SID:"
4163 " %u\n", conn->cid, sess->sid);
4164 /*
4165 * Always up conn_logout_comp just in case the RX Thread is sleeping
4166 * and the logout response never got sent because the connection
4167 * failed.
4168 */
4169 complete(&conn->conn_logout_comp);
4170
4171 iscsi_release_thread_set(conn);
4172
4173 iscsit_stop_timers_for_cmds(conn);
4174 iscsit_stop_nopin_response_timer(conn);
4175 iscsit_stop_nopin_timer(conn);
4176 iscsit_free_queue_reqs_for_conn(conn);
4177
4178 /*
4179 * During Connection recovery drop unacknowledged out of order
4180 * commands for this connection, and prepare the other commands
4181 * for realligence.
4182 *
4183 * During normal operation clear the out of order commands (but
4184 * do not free the struct iscsi_ooo_cmdsn's) and release all
4185 * struct iscsi_cmds.
4186 */
4187 if (atomic_read(&conn->connection_recovery)) {
4188 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4189 iscsit_prepare_cmds_for_realligance(conn);
4190 } else {
4191 iscsit_clear_ooo_cmdsns_for_conn(conn);
4192 iscsit_release_commands_from_conn(conn);
4193 }
4194
4195 /*
4196 * Handle decrementing session or connection usage count if
4197 * a logout response was not able to be sent because the
4198 * connection failed. Fall back to Session Recovery here.
4199 */
4200 if (atomic_read(&conn->conn_logout_remove)) {
4201 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4202 iscsit_dec_conn_usage_count(conn);
4203 iscsit_dec_session_usage_count(sess);
4204 }
4205 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4206 iscsit_dec_conn_usage_count(conn);
4207
4208 atomic_set(&conn->conn_logout_remove, 0);
4209 atomic_set(&sess->session_reinstatement, 0);
4210 atomic_set(&sess->session_fall_back_to_erl0, 1);
4211 }
4212
4213 spin_lock_bh(&sess->conn_lock);
4214 list_del(&conn->conn_list);
4215
4216 /*
4217 * Attempt to let the Initiator know this connection failed by
4218 * sending an Connection Dropped Async Message on another
4219 * active connection.
4220 */
4221 if (atomic_read(&conn->connection_recovery))
4222 iscsit_build_conn_drop_async_message(conn);
4223
4224 spin_unlock_bh(&sess->conn_lock);
4225
4226 /*
4227 * If connection reinstatement is being performed on this connection,
4228 * up the connection reinstatement semaphore that is being blocked on
4229 * in iscsit_cause_connection_reinstatement().
4230 */
4231 spin_lock_bh(&conn->state_lock);
4232 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4233 spin_unlock_bh(&conn->state_lock);
4234 complete(&conn->conn_wait_comp);
4235 wait_for_completion(&conn->conn_post_wait_comp);
4236 spin_lock_bh(&conn->state_lock);
4237 }
4238
4239 /*
4240 * If connection reinstatement is being performed on this connection
4241 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4242 * connection wait rcfr semaphore that is being blocked on
4243 * an iscsit_connection_reinstatement_rcfr().
4244 */
4245 if (atomic_read(&conn->connection_wait_rcfr)) {
4246 spin_unlock_bh(&conn->state_lock);
4247 complete(&conn->conn_wait_rcfr_comp);
4248 wait_for_completion(&conn->conn_post_wait_comp);
4249 spin_lock_bh(&conn->state_lock);
4250 }
4251 atomic_set(&conn->connection_reinstatement, 1);
4252 spin_unlock_bh(&conn->state_lock);
4253
4254 /*
4255 * If any other processes are accessing this connection pointer we
4256 * must wait until they have completed.
4257 */
4258 iscsit_check_conn_usage_count(conn);
4259
4260 if (conn->conn_rx_hash.tfm)
4261 crypto_free_hash(conn->conn_rx_hash.tfm);
4262 if (conn->conn_tx_hash.tfm)
4263 crypto_free_hash(conn->conn_tx_hash.tfm);
4264
4265 if (conn->conn_cpumask)
4266 free_cpumask_var(conn->conn_cpumask);
4267
4268 kfree(conn->conn_ops);
4269 conn->conn_ops = NULL;
4270
4271 if (conn->sock)
4272 sock_release(conn->sock);
4273
4274 if (conn->conn_transport->iscsit_free_conn)
4275 conn->conn_transport->iscsit_free_conn(conn);
4276
4277 iscsit_put_transport(conn->conn_transport);
4278
4279 conn->thread_set = NULL;
4280
4281 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4282 conn->conn_state = TARG_CONN_STATE_FREE;
4283 kfree(conn);
4284
4285 spin_lock_bh(&sess->conn_lock);
4286 atomic_dec(&sess->nconn);
4287 pr_debug("Decremented iSCSI connection count to %hu from node:"
4288 " %s\n", atomic_read(&sess->nconn),
4289 sess->sess_ops->InitiatorName);
4290 /*
4291 * Make sure that if one connection fails in an non ERL=2 iSCSI
4292 * Session that they all fail.
4293 */
4294 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4295 !atomic_read(&sess->session_logout))
4296 atomic_set(&sess->session_fall_back_to_erl0, 1);
4297
4298 /*
4299 * If this was not the last connection in the session, and we are
4300 * performing session reinstatement or falling back to ERL=0, call
4301 * iscsit_stop_session() without sleeping to shutdown the other
4302 * active connections.
4303 */
4304 if (atomic_read(&sess->nconn)) {
4305 if (!atomic_read(&sess->session_reinstatement) &&
4306 !atomic_read(&sess->session_fall_back_to_erl0)) {
4307 spin_unlock_bh(&sess->conn_lock);
4308 return 0;
4309 }
4310 if (!atomic_read(&sess->session_stop_active)) {
4311 atomic_set(&sess->session_stop_active, 1);
4312 spin_unlock_bh(&sess->conn_lock);
4313 iscsit_stop_session(sess, 0, 0);
4314 return 0;
4315 }
4316 spin_unlock_bh(&sess->conn_lock);
4317 return 0;
4318 }
4319
4320 /*
4321 * If this was the last connection in the session and one of the
4322 * following is occurring:
4323 *
4324 * Session Reinstatement is not being performed, and are falling back
4325 * to ERL=0 call iscsit_close_session().
4326 *
4327 * Session Logout was requested. iscsit_close_session() will be called
4328 * elsewhere.
4329 *
4330 * Session Continuation is not being performed, start the Time2Retain
4331 * handler and check if sleep_on_sess_wait_sem is active.
4332 */
4333 if (!atomic_read(&sess->session_reinstatement) &&
4334 atomic_read(&sess->session_fall_back_to_erl0)) {
4335 spin_unlock_bh(&sess->conn_lock);
4336 target_put_session(sess->se_sess);
4337
4338 return 0;
4339 } else if (atomic_read(&sess->session_logout)) {
4340 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4341 sess->session_state = TARG_SESS_STATE_FREE;
4342 spin_unlock_bh(&sess->conn_lock);
4343
4344 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4345 complete(&sess->session_wait_comp);
4346
4347 return 0;
4348 } else {
4349 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4350 sess->session_state = TARG_SESS_STATE_FAILED;
4351
4352 if (!atomic_read(&sess->session_continuation)) {
4353 spin_unlock_bh(&sess->conn_lock);
4354 iscsit_start_time2retain_handler(sess);
4355 } else
4356 spin_unlock_bh(&sess->conn_lock);
4357
4358 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4359 complete(&sess->session_wait_comp);
4360
4361 return 0;
4362 }
4363 spin_unlock_bh(&sess->conn_lock);
4364
4365 return 0;
4366 }
4367
4368 int iscsit_close_session(struct iscsi_session *sess)
4369 {
4370 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4371 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4372
4373 if (atomic_read(&sess->nconn)) {
4374 pr_err("%d connection(s) still exist for iSCSI session"
4375 " to %s\n", atomic_read(&sess->nconn),
4376 sess->sess_ops->InitiatorName);
4377 BUG();
4378 }
4379
4380 spin_lock_bh(&se_tpg->session_lock);
4381 atomic_set(&sess->session_logout, 1);
4382 atomic_set(&sess->session_reinstatement, 1);
4383 iscsit_stop_time2retain_timer(sess);
4384 spin_unlock_bh(&se_tpg->session_lock);
4385
4386 /*
4387 * transport_deregister_session_configfs() will clear the
4388 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4389 * can be setting it again with __transport_register_session() in
4390 * iscsi_post_login_handler() again after the iscsit_stop_session()
4391 * completes in iscsi_np context.
4392 */
4393 transport_deregister_session_configfs(sess->se_sess);
4394
4395 /*
4396 * If any other processes are accessing this session pointer we must
4397 * wait until they have completed. If we are in an interrupt (the
4398 * time2retain handler) and contain and active session usage count we
4399 * restart the timer and exit.
4400 */
4401 if (!in_interrupt()) {
4402 if (iscsit_check_session_usage_count(sess) == 1)
4403 iscsit_stop_session(sess, 1, 1);
4404 } else {
4405 if (iscsit_check_session_usage_count(sess) == 2) {
4406 atomic_set(&sess->session_logout, 0);
4407 iscsit_start_time2retain_handler(sess);
4408 return 0;
4409 }
4410 }
4411
4412 transport_deregister_session(sess->se_sess);
4413
4414 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4415 iscsit_free_connection_recovery_entires(sess);
4416
4417 iscsit_free_all_ooo_cmdsns(sess);
4418
4419 spin_lock_bh(&se_tpg->session_lock);
4420 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4421 sess->session_state = TARG_SESS_STATE_FREE;
4422 pr_debug("Released iSCSI session from node: %s\n",
4423 sess->sess_ops->InitiatorName);
4424 tpg->nsessions--;
4425 if (tpg->tpg_tiqn)
4426 tpg->tpg_tiqn->tiqn_nsessions--;
4427
4428 pr_debug("Decremented number of active iSCSI Sessions on"
4429 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4430
4431 spin_lock(&sess_idr_lock);
4432 idr_remove(&sess_idr, sess->session_index);
4433 spin_unlock(&sess_idr_lock);
4434
4435 kfree(sess->sess_ops);
4436 sess->sess_ops = NULL;
4437 spin_unlock_bh(&se_tpg->session_lock);
4438
4439 kfree(sess);
4440 return 0;
4441 }
4442
4443 static void iscsit_logout_post_handler_closesession(
4444 struct iscsi_conn *conn)
4445 {
4446 struct iscsi_session *sess = conn->sess;
4447
4448 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4449 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4450
4451 atomic_set(&conn->conn_logout_remove, 0);
4452 complete(&conn->conn_logout_comp);
4453
4454 iscsit_dec_conn_usage_count(conn);
4455 iscsit_stop_session(sess, 1, 1);
4456 iscsit_dec_session_usage_count(sess);
4457 target_put_session(sess->se_sess);
4458 }
4459
4460 static void iscsit_logout_post_handler_samecid(
4461 struct iscsi_conn *conn)
4462 {
4463 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4464 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4465
4466 atomic_set(&conn->conn_logout_remove, 0);
4467 complete(&conn->conn_logout_comp);
4468
4469 iscsit_cause_connection_reinstatement(conn, 1);
4470 iscsit_dec_conn_usage_count(conn);
4471 }
4472
4473 static void iscsit_logout_post_handler_diffcid(
4474 struct iscsi_conn *conn,
4475 u16 cid)
4476 {
4477 struct iscsi_conn *l_conn;
4478 struct iscsi_session *sess = conn->sess;
4479
4480 if (!sess)
4481 return;
4482
4483 spin_lock_bh(&sess->conn_lock);
4484 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4485 if (l_conn->cid == cid) {
4486 iscsit_inc_conn_usage_count(l_conn);
4487 break;
4488 }
4489 }
4490 spin_unlock_bh(&sess->conn_lock);
4491
4492 if (!l_conn)
4493 return;
4494
4495 if (l_conn->sock)
4496 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4497
4498 spin_lock_bh(&l_conn->state_lock);
4499 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4500 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4501 spin_unlock_bh(&l_conn->state_lock);
4502
4503 iscsit_cause_connection_reinstatement(l_conn, 1);
4504 iscsit_dec_conn_usage_count(l_conn);
4505 }
4506
4507 /*
4508 * Return of 0 causes the TX thread to restart.
4509 */
4510 int iscsit_logout_post_handler(
4511 struct iscsi_cmd *cmd,
4512 struct iscsi_conn *conn)
4513 {
4514 int ret = 0;
4515
4516 switch (cmd->logout_reason) {
4517 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4518 switch (cmd->logout_response) {
4519 case ISCSI_LOGOUT_SUCCESS:
4520 case ISCSI_LOGOUT_CLEANUP_FAILED:
4521 default:
4522 iscsit_logout_post_handler_closesession(conn);
4523 break;
4524 }
4525 ret = 0;
4526 break;
4527 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4528 if (conn->cid == cmd->logout_cid) {
4529 switch (cmd->logout_response) {
4530 case ISCSI_LOGOUT_SUCCESS:
4531 case ISCSI_LOGOUT_CLEANUP_FAILED:
4532 default:
4533 iscsit_logout_post_handler_samecid(conn);
4534 break;
4535 }
4536 ret = 0;
4537 } else {
4538 switch (cmd->logout_response) {
4539 case ISCSI_LOGOUT_SUCCESS:
4540 iscsit_logout_post_handler_diffcid(conn,
4541 cmd->logout_cid);
4542 break;
4543 case ISCSI_LOGOUT_CID_NOT_FOUND:
4544 case ISCSI_LOGOUT_CLEANUP_FAILED:
4545 default:
4546 break;
4547 }
4548 ret = 1;
4549 }
4550 break;
4551 case ISCSI_LOGOUT_REASON_RECOVERY:
4552 switch (cmd->logout_response) {
4553 case ISCSI_LOGOUT_SUCCESS:
4554 case ISCSI_LOGOUT_CID_NOT_FOUND:
4555 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4556 case ISCSI_LOGOUT_CLEANUP_FAILED:
4557 default:
4558 break;
4559 }
4560 ret = 1;
4561 break;
4562 default:
4563 break;
4564
4565 }
4566 return ret;
4567 }
4568 EXPORT_SYMBOL(iscsit_logout_post_handler);
4569
4570 void iscsit_fail_session(struct iscsi_session *sess)
4571 {
4572 struct iscsi_conn *conn;
4573
4574 spin_lock_bh(&sess->conn_lock);
4575 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4576 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4577 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4578 }
4579 spin_unlock_bh(&sess->conn_lock);
4580
4581 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4582 sess->session_state = TARG_SESS_STATE_FAILED;
4583 }
4584
4585 int iscsit_free_session(struct iscsi_session *sess)
4586 {
4587 u16 conn_count = atomic_read(&sess->nconn);
4588 struct iscsi_conn *conn, *conn_tmp = NULL;
4589 int is_last;
4590
4591 spin_lock_bh(&sess->conn_lock);
4592 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4593
4594 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4595 conn_list) {
4596 if (conn_count == 0)
4597 break;
4598
4599 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4600 is_last = 1;
4601 } else {
4602 iscsit_inc_conn_usage_count(conn_tmp);
4603 is_last = 0;
4604 }
4605 iscsit_inc_conn_usage_count(conn);
4606
4607 spin_unlock_bh(&sess->conn_lock);
4608 iscsit_cause_connection_reinstatement(conn, 1);
4609 spin_lock_bh(&sess->conn_lock);
4610
4611 iscsit_dec_conn_usage_count(conn);
4612 if (is_last == 0)
4613 iscsit_dec_conn_usage_count(conn_tmp);
4614
4615 conn_count--;
4616 }
4617
4618 if (atomic_read(&sess->nconn)) {
4619 spin_unlock_bh(&sess->conn_lock);
4620 wait_for_completion(&sess->session_wait_comp);
4621 } else
4622 spin_unlock_bh(&sess->conn_lock);
4623
4624 target_put_session(sess->se_sess);
4625 return 0;
4626 }
4627
4628 void iscsit_stop_session(
4629 struct iscsi_session *sess,
4630 int session_sleep,
4631 int connection_sleep)
4632 {
4633 u16 conn_count = atomic_read(&sess->nconn);
4634 struct iscsi_conn *conn, *conn_tmp = NULL;
4635 int is_last;
4636
4637 spin_lock_bh(&sess->conn_lock);
4638 if (session_sleep)
4639 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4640
4641 if (connection_sleep) {
4642 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4643 conn_list) {
4644 if (conn_count == 0)
4645 break;
4646
4647 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4648 is_last = 1;
4649 } else {
4650 iscsit_inc_conn_usage_count(conn_tmp);
4651 is_last = 0;
4652 }
4653 iscsit_inc_conn_usage_count(conn);
4654
4655 spin_unlock_bh(&sess->conn_lock);
4656 iscsit_cause_connection_reinstatement(conn, 1);
4657 spin_lock_bh(&sess->conn_lock);
4658
4659 iscsit_dec_conn_usage_count(conn);
4660 if (is_last == 0)
4661 iscsit_dec_conn_usage_count(conn_tmp);
4662 conn_count--;
4663 }
4664 } else {
4665 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4666 iscsit_cause_connection_reinstatement(conn, 0);
4667 }
4668
4669 if (session_sleep && atomic_read(&sess->nconn)) {
4670 spin_unlock_bh(&sess->conn_lock);
4671 wait_for_completion(&sess->session_wait_comp);
4672 } else
4673 spin_unlock_bh(&sess->conn_lock);
4674 }
4675
4676 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4677 {
4678 struct iscsi_session *sess;
4679 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4680 struct se_session *se_sess, *se_sess_tmp;
4681 int session_count = 0;
4682
4683 spin_lock_bh(&se_tpg->session_lock);
4684 if (tpg->nsessions && !force) {
4685 spin_unlock_bh(&se_tpg->session_lock);
4686 return -1;
4687 }
4688
4689 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4690 sess_list) {
4691 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4692
4693 spin_lock(&sess->conn_lock);
4694 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4695 atomic_read(&sess->session_logout) ||
4696 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4697 spin_unlock(&sess->conn_lock);
4698 continue;
4699 }
4700 atomic_set(&sess->session_reinstatement, 1);
4701 spin_unlock(&sess->conn_lock);
4702 spin_unlock_bh(&se_tpg->session_lock);
4703
4704 iscsit_free_session(sess);
4705 spin_lock_bh(&se_tpg->session_lock);
4706
4707 session_count++;
4708 }
4709 spin_unlock_bh(&se_tpg->session_lock);
4710
4711 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4712 " Group: %hu\n", session_count, tpg->tpgt);
4713 return 0;
4714 }
4715
4716 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4717 MODULE_VERSION("4.1.x");
4718 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4719 MODULE_LICENSE("GPL");
4720
4721 module_init(iscsi_target_init_module);
4722 module_exit(iscsi_target_cleanup_module);
kernel source for telekom puls (alcatel/mediatek)