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hpsa: fix bad -ENOMEM return value in hpsa_big_passthru_ioctl
[linux/fpc-iii.git] / drivers / target / iscsi / iscsi_target.c
blobd2ff406802083edc9dfcbfc71303b4093637a5a2
1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19 #include <linux/string.h>
20 #include <linux/kthread.h>
21 #include <linux/crypto.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/idr.h>
25 #include <asm/unaligned.h>
26 #include <scsi/scsi_device.h>
27 #include <scsi/iscsi_proto.h>
28 #include <scsi/scsi_tcq.h>
29 #include <target/target_core_base.h>
30 #include <target/target_core_fabric.h>
31 #include <target/target_core_configfs.h>
32
33 #include "iscsi_target_core.h"
34 #include "iscsi_target_parameters.h"
35 #include "iscsi_target_seq_pdu_list.h"
36 #include "iscsi_target_tq.h"
37 #include "iscsi_target_configfs.h"
38 #include "iscsi_target_datain_values.h"
39 #include "iscsi_target_erl0.h"
40 #include "iscsi_target_erl1.h"
41 #include "iscsi_target_erl2.h"
42 #include "iscsi_target_login.h"
43 #include "iscsi_target_tmr.h"
44 #include "iscsi_target_tpg.h"
45 #include "iscsi_target_util.h"
46 #include "iscsi_target.h"
47 #include "iscsi_target_device.h"
48 #include "iscsi_target_stat.h"
49
50 #include <target/iscsi/iscsi_transport.h>
51
52 static LIST_HEAD(g_tiqn_list);
53 static LIST_HEAD(g_np_list);
54 static DEFINE_SPINLOCK(tiqn_lock);
55 static DEFINE_MUTEX(np_lock);
56
57 static struct idr tiqn_idr;
58 struct idr sess_idr;
59 struct mutex auth_id_lock;
60 spinlock_t sess_idr_lock;
61
62 struct iscsit_global *iscsit_global;
63
64 struct kmem_cache *lio_qr_cache;
65 struct kmem_cache *lio_dr_cache;
66 struct kmem_cache *lio_ooo_cache;
67 struct kmem_cache *lio_r2t_cache;
68
69 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
70 struct iscsi_scsi_req *, u32);
71
72 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
73 {
74 struct iscsi_tiqn *tiqn = NULL;
75
76 spin_lock(&tiqn_lock);
77 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
78 if (!strcmp(tiqn->tiqn, buf)) {
79
80 spin_lock(&tiqn->tiqn_state_lock);
81 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
82 tiqn->tiqn_access_count++;
83 spin_unlock(&tiqn->tiqn_state_lock);
84 spin_unlock(&tiqn_lock);
85 return tiqn;
86 }
87 spin_unlock(&tiqn->tiqn_state_lock);
88 }
89 }
90 spin_unlock(&tiqn_lock);
91
92 return NULL;
93 }
94
95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
96 {
97 spin_lock(&tiqn->tiqn_state_lock);
98 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
99 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
100 spin_unlock(&tiqn->tiqn_state_lock);
101 return 0;
102 }
103 spin_unlock(&tiqn->tiqn_state_lock);
104
105 return -1;
106 }
107
108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
109 {
110 spin_lock(&tiqn->tiqn_state_lock);
111 tiqn->tiqn_access_count--;
112 spin_unlock(&tiqn->tiqn_state_lock);
113 }
114
115 /*
116 * Note that IQN formatting is expected to be done in userspace, and
117 * no explict IQN format checks are done here.
118 */
119 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
120 {
121 struct iscsi_tiqn *tiqn = NULL;
122 int ret;
123
124 if (strlen(buf) >= ISCSI_IQN_LEN) {
125 pr_err("Target IQN exceeds %d bytes\n",
126 ISCSI_IQN_LEN);
127 return ERR_PTR(-EINVAL);
128 }
129
130 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
131 if (!tiqn) {
132 pr_err("Unable to allocate struct iscsi_tiqn\n");
133 return ERR_PTR(-ENOMEM);
134 }
135
136 sprintf(tiqn->tiqn, "%s", buf);
137 INIT_LIST_HEAD(&tiqn->tiqn_list);
138 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
139 spin_lock_init(&tiqn->tiqn_state_lock);
140 spin_lock_init(&tiqn->tiqn_tpg_lock);
141 spin_lock_init(&tiqn->sess_err_stats.lock);
142 spin_lock_init(&tiqn->login_stats.lock);
143 spin_lock_init(&tiqn->logout_stats.lock);
144
145 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
146
147 idr_preload(GFP_KERNEL);
148 spin_lock(&tiqn_lock);
149
150 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
151 if (ret < 0) {
152 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
153 spin_unlock(&tiqn_lock);
154 idr_preload_end();
155 kfree(tiqn);
156 return ERR_PTR(ret);
157 }
158 tiqn->tiqn_index = ret;
159 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
160
161 spin_unlock(&tiqn_lock);
162 idr_preload_end();
163
164 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
165
166 return tiqn;
167
168 }
169
170 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
171 {
172 /*
173 * Wait for accesses to said struct iscsi_tiqn to end.
174 */
175 spin_lock(&tiqn->tiqn_state_lock);
176 while (tiqn->tiqn_access_count != 0) {
177 spin_unlock(&tiqn->tiqn_state_lock);
178 msleep(10);
179 spin_lock(&tiqn->tiqn_state_lock);
180 }
181 spin_unlock(&tiqn->tiqn_state_lock);
182 }
183
184 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
185 {
186 /*
187 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
188 * while holding tiqn->tiqn_state_lock. This means that all subsequent
189 * attempts to access this struct iscsi_tiqn will fail from both transport
190 * fabric and control code paths.
191 */
192 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
193 pr_err("iscsit_set_tiqn_shutdown() failed\n");
194 return;
195 }
196
197 iscsit_wait_for_tiqn(tiqn);
198
199 spin_lock(&tiqn_lock);
200 list_del(&tiqn->tiqn_list);
201 idr_remove(&tiqn_idr, tiqn->tiqn_index);
202 spin_unlock(&tiqn_lock);
203
204 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
205 tiqn->tiqn);
206 kfree(tiqn);
207 }
208
209 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
210 {
211 int ret;
212 /*
213 * Determine if the network portal is accepting storage traffic.
214 */
215 spin_lock_bh(&np->np_thread_lock);
216 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
217 spin_unlock_bh(&np->np_thread_lock);
218 return -1;
219 }
220 spin_unlock_bh(&np->np_thread_lock);
221 /*
222 * Determine if the portal group is accepting storage traffic.
223 */
224 spin_lock_bh(&tpg->tpg_state_lock);
225 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
226 spin_unlock_bh(&tpg->tpg_state_lock);
227 return -1;
228 }
229 spin_unlock_bh(&tpg->tpg_state_lock);
230
231 /*
232 * Here we serialize access across the TIQN+TPG Tuple.
233 */
234 ret = down_interruptible(&tpg->np_login_sem);
235 if ((ret != 0) || signal_pending(current))
236 return -1;
237
238 spin_lock_bh(&tpg->tpg_state_lock);
239 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
240 spin_unlock_bh(&tpg->tpg_state_lock);
241 up(&tpg->np_login_sem);
242 return -1;
243 }
244 spin_unlock_bh(&tpg->tpg_state_lock);
245
246 return 0;
247 }
248
249 void iscsit_login_kref_put(struct kref *kref)
250 {
251 struct iscsi_tpg_np *tpg_np = container_of(kref,
252 struct iscsi_tpg_np, tpg_np_kref);
253
254 complete(&tpg_np->tpg_np_comp);
255 }
256
257 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
258 struct iscsi_tpg_np *tpg_np)
259 {
260 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
261
262 up(&tpg->np_login_sem);
263
264 if (tpg_np)
265 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
266
267 if (tiqn)
268 iscsit_put_tiqn_for_login(tiqn);
269
270 return 0;
271 }
272
273 bool iscsit_check_np_match(
274 struct __kernel_sockaddr_storage *sockaddr,
275 struct iscsi_np *np,
276 int network_transport)
277 {
278 struct sockaddr_in *sock_in, *sock_in_e;
279 struct sockaddr_in6 *sock_in6, *sock_in6_e;
280 bool ip_match = false;
281 u16 port;
282
283 if (sockaddr->ss_family == AF_INET6) {
284 sock_in6 = (struct sockaddr_in6 *)sockaddr;
285 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
286
287 if (!memcmp(&sock_in6->sin6_addr.in6_u,
288 &sock_in6_e->sin6_addr.in6_u,
289 sizeof(struct in6_addr)))
290 ip_match = true;
291
292 port = ntohs(sock_in6->sin6_port);
293 } else {
294 sock_in = (struct sockaddr_in *)sockaddr;
295 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
296
297 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
298 ip_match = true;
299
300 port = ntohs(sock_in->sin_port);
301 }
302
303 if ((ip_match == true) && (np->np_port == port) &&
304 (np->np_network_transport == network_transport))
305 return true;
306
307 return false;
308 }
309
310 /*
311 * Called with mutex np_lock held
312 */
313 static struct iscsi_np *iscsit_get_np(
314 struct __kernel_sockaddr_storage *sockaddr,
315 int network_transport)
316 {
317 struct iscsi_np *np;
318 bool match;
319
320 list_for_each_entry(np, &g_np_list, np_list) {
321 spin_lock_bh(&np->np_thread_lock);
322 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
323 spin_unlock_bh(&np->np_thread_lock);
324 continue;
325 }
326
327 match = iscsit_check_np_match(sockaddr, np, network_transport);
328 if (match == true) {
329 /*
330 * Increment the np_exports reference count now to
331 * prevent iscsit_del_np() below from being called
332 * while iscsi_tpg_add_network_portal() is called.
333 */
334 np->np_exports++;
335 spin_unlock_bh(&np->np_thread_lock);
336 return np;
337 }
338 spin_unlock_bh(&np->np_thread_lock);
339 }
340
341 return NULL;
342 }
343
344 struct iscsi_np *iscsit_add_np(
345 struct __kernel_sockaddr_storage *sockaddr,
346 char *ip_str,
347 int network_transport)
348 {
349 struct sockaddr_in *sock_in;
350 struct sockaddr_in6 *sock_in6;
351 struct iscsi_np *np;
352 int ret;
353
354 mutex_lock(&np_lock);
355
356 /*
357 * Locate the existing struct iscsi_np if already active..
358 */
359 np = iscsit_get_np(sockaddr, network_transport);
360 if (np) {
361 mutex_unlock(&np_lock);
362 return np;
363 }
364
365 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
366 if (!np) {
367 pr_err("Unable to allocate memory for struct iscsi_np\n");
368 mutex_unlock(&np_lock);
369 return ERR_PTR(-ENOMEM);
370 }
371
372 np->np_flags |= NPF_IP_NETWORK;
373 if (sockaddr->ss_family == AF_INET6) {
374 sock_in6 = (struct sockaddr_in6 *)sockaddr;
375 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
376 np->np_port = ntohs(sock_in6->sin6_port);
377 } else {
378 sock_in = (struct sockaddr_in *)sockaddr;
379 sprintf(np->np_ip, "%s", ip_str);
380 np->np_port = ntohs(sock_in->sin_port);
381 }
382
383 np->np_network_transport = network_transport;
384 spin_lock_init(&np->np_thread_lock);
385 init_completion(&np->np_restart_comp);
386 INIT_LIST_HEAD(&np->np_list);
387
388 ret = iscsi_target_setup_login_socket(np, sockaddr);
389 if (ret != 0) {
390 kfree(np);
391 mutex_unlock(&np_lock);
392 return ERR_PTR(ret);
393 }
394
395 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
396 if (IS_ERR(np->np_thread)) {
397 pr_err("Unable to create kthread: iscsi_np\n");
398 ret = PTR_ERR(np->np_thread);
399 kfree(np);
400 mutex_unlock(&np_lock);
401 return ERR_PTR(ret);
402 }
403 /*
404 * Increment the np_exports reference count now to prevent
405 * iscsit_del_np() below from being run while a new call to
406 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
407 * active. We don't need to hold np->np_thread_lock at this
408 * point because iscsi_np has not been added to g_np_list yet.
409 */
410 np->np_exports = 1;
411 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
412
413 list_add_tail(&np->np_list, &g_np_list);
414 mutex_unlock(&np_lock);
415
416 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
417 np->np_ip, np->np_port, np->np_transport->name);
418
419 return np;
420 }
421
422 int iscsit_reset_np_thread(
423 struct iscsi_np *np,
424 struct iscsi_tpg_np *tpg_np,
425 struct iscsi_portal_group *tpg,
426 bool shutdown)
427 {
428 spin_lock_bh(&np->np_thread_lock);
429 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
430 spin_unlock_bh(&np->np_thread_lock);
431 return 0;
432 }
433 np->np_thread_state = ISCSI_NP_THREAD_RESET;
434
435 if (np->np_thread) {
436 spin_unlock_bh(&np->np_thread_lock);
437 send_sig(SIGINT, np->np_thread, 1);
438 wait_for_completion(&np->np_restart_comp);
439 spin_lock_bh(&np->np_thread_lock);
440 }
441 spin_unlock_bh(&np->np_thread_lock);
442
443 if (tpg_np && shutdown) {
444 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
445
446 wait_for_completion(&tpg_np->tpg_np_comp);
447 }
448
449 return 0;
450 }
451
452 static void iscsit_free_np(struct iscsi_np *np)
453 {
454 if (np->np_socket)
455 sock_release(np->np_socket);
456 }
457
458 int iscsit_del_np(struct iscsi_np *np)
459 {
460 spin_lock_bh(&np->np_thread_lock);
461 np->np_exports--;
462 if (np->np_exports) {
463 np->enabled = true;
464 spin_unlock_bh(&np->np_thread_lock);
465 return 0;
466 }
467 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
468 spin_unlock_bh(&np->np_thread_lock);
469
470 if (np->np_thread) {
471 /*
472 * We need to send the signal to wakeup Linux/Net
473 * which may be sleeping in sock_accept()..
474 */
475 send_sig(SIGINT, np->np_thread, 1);
476 kthread_stop(np->np_thread);
477 np->np_thread = NULL;
478 }
479
480 np->np_transport->iscsit_free_np(np);
481
482 mutex_lock(&np_lock);
483 list_del(&np->np_list);
484 mutex_unlock(&np_lock);
485
486 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
487 np->np_ip, np->np_port, np->np_transport->name);
488
489 iscsit_put_transport(np->np_transport);
490 kfree(np);
491 return 0;
492 }
493
494 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
495 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
496
497 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
498 {
499 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
500 return 0;
501 }
502
503 static struct iscsit_transport iscsi_target_transport = {
504 .name = "iSCSI/TCP",
505 .transport_type = ISCSI_TCP,
506 .owner = NULL,
507 .iscsit_setup_np = iscsit_setup_np,
508 .iscsit_accept_np = iscsit_accept_np,
509 .iscsit_free_np = iscsit_free_np,
510 .iscsit_get_login_rx = iscsit_get_login_rx,
511 .iscsit_put_login_tx = iscsit_put_login_tx,
512 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
513 .iscsit_immediate_queue = iscsit_immediate_queue,
514 .iscsit_response_queue = iscsit_response_queue,
515 .iscsit_queue_data_in = iscsit_queue_rsp,
516 .iscsit_queue_status = iscsit_queue_rsp,
517 };
518
519 static int __init iscsi_target_init_module(void)
520 {
521 int ret = 0;
522
523 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
524
525 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
526 if (!iscsit_global) {
527 pr_err("Unable to allocate memory for iscsit_global\n");
528 return -1;
529 }
530 mutex_init(&auth_id_lock);
531 spin_lock_init(&sess_idr_lock);
532 idr_init(&tiqn_idr);
533 idr_init(&sess_idr);
534
535 ret = iscsi_target_register_configfs();
536 if (ret < 0)
537 goto out;
538
539 ret = iscsi_thread_set_init();
540 if (ret < 0)
541 goto configfs_out;
542
543 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
544 TARGET_THREAD_SET_COUNT) {
545 pr_err("iscsi_allocate_thread_sets() returned"
546 " unexpected value!\n");
547 goto ts_out1;
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 ts_out2;
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 ts_out2:
601 iscsi_deallocate_thread_sets();
602 ts_out1:
603 iscsi_thread_set_free();
604 configfs_out:
605 iscsi_target_deregister_configfs();
606 out:
607 kfree(iscsit_global);
608 return -ENOMEM;
609 }
610
611 static void __exit iscsi_target_cleanup_module(void)
612 {
613 iscsi_deallocate_thread_sets();
614 iscsi_thread_set_free();
615 iscsit_release_discovery_tpg();
616 iscsit_unregister_transport(&iscsi_target_transport);
617 kmem_cache_destroy(lio_qr_cache);
618 kmem_cache_destroy(lio_dr_cache);
619 kmem_cache_destroy(lio_ooo_cache);
620 kmem_cache_destroy(lio_r2t_cache);
621
622 iscsi_target_deregister_configfs();
623
624 kfree(iscsit_global);
625 }
626
627 static int iscsit_add_reject(
628 struct iscsi_conn *conn,
629 u8 reason,
630 unsigned char *buf)
631 {
632 struct iscsi_cmd *cmd;
633
634 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
635 if (!cmd)
636 return -1;
637
638 cmd->iscsi_opcode = ISCSI_OP_REJECT;
639 cmd->reject_reason = reason;
640
641 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
642 if (!cmd->buf_ptr) {
643 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
644 iscsit_free_cmd(cmd, false);
645 return -1;
646 }
647
648 spin_lock_bh(&conn->cmd_lock);
649 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
650 spin_unlock_bh(&conn->cmd_lock);
651
652 cmd->i_state = ISTATE_SEND_REJECT;
653 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
654
655 return -1;
656 }
657
658 static int iscsit_add_reject_from_cmd(
659 struct iscsi_cmd *cmd,
660 u8 reason,
661 bool add_to_conn,
662 unsigned char *buf)
663 {
664 struct iscsi_conn *conn;
665
666 if (!cmd->conn) {
667 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
668 cmd->init_task_tag);
669 return -1;
670 }
671 conn = cmd->conn;
672
673 cmd->iscsi_opcode = ISCSI_OP_REJECT;
674 cmd->reject_reason = reason;
675
676 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
677 if (!cmd->buf_ptr) {
678 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
679 iscsit_free_cmd(cmd, false);
680 return -1;
681 }
682
683 if (add_to_conn) {
684 spin_lock_bh(&conn->cmd_lock);
685 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
686 spin_unlock_bh(&conn->cmd_lock);
687 }
688
689 cmd->i_state = ISTATE_SEND_REJECT;
690 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
691 /*
692 * Perform the kref_put now if se_cmd has already been setup by
693 * scsit_setup_scsi_cmd()
694 */
695 if (cmd->se_cmd.se_tfo != NULL) {
696 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
697 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
698 }
699 return -1;
700 }
701
702 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
703 unsigned char *buf)
704 {
705 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
706 }
707
708 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
709 {
710 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
711 }
712
713 /*
714 * Map some portion of the allocated scatterlist to an iovec, suitable for
715 * kernel sockets to copy data in/out.
716 */
717 static int iscsit_map_iovec(
718 struct iscsi_cmd *cmd,
719 struct kvec *iov,
720 u32 data_offset,
721 u32 data_length)
722 {
723 u32 i = 0;
724 struct scatterlist *sg;
725 unsigned int page_off;
726
727 /*
728 * We know each entry in t_data_sg contains a page.
729 */
730 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
731 page_off = (data_offset % PAGE_SIZE);
732
733 cmd->first_data_sg = sg;
734 cmd->first_data_sg_off = page_off;
735
736 while (data_length) {
737 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
738
739 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
740 iov[i].iov_len = cur_len;
741
742 data_length -= cur_len;
743 page_off = 0;
744 sg = sg_next(sg);
745 i++;
746 }
747
748 cmd->kmapped_nents = i;
749
750 return i;
751 }
752
753 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
754 {
755 u32 i;
756 struct scatterlist *sg;
757
758 sg = cmd->first_data_sg;
759
760 for (i = 0; i < cmd->kmapped_nents; i++)
761 kunmap(sg_page(&sg[i]));
762 }
763
764 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
765 {
766 LIST_HEAD(ack_list);
767 struct iscsi_cmd *cmd, *cmd_p;
768
769 conn->exp_statsn = exp_statsn;
770
771 if (conn->sess->sess_ops->RDMAExtensions)
772 return;
773
774 spin_lock_bh(&conn->cmd_lock);
775 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
776 spin_lock(&cmd->istate_lock);
777 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
778 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
779 cmd->i_state = ISTATE_REMOVE;
780 spin_unlock(&cmd->istate_lock);
781 list_move_tail(&cmd->i_conn_node, &ack_list);
782 continue;
783 }
784 spin_unlock(&cmd->istate_lock);
785 }
786 spin_unlock_bh(&conn->cmd_lock);
787
788 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
789 list_del_init(&cmd->i_conn_node);
790 iscsit_free_cmd(cmd, false);
791 }
792 }
793
794 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
795 {
796 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
797
798 iov_count += ISCSI_IOV_DATA_BUFFER;
799
800 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
801 if (!cmd->iov_data) {
802 pr_err("Unable to allocate cmd->iov_data\n");
803 return -ENOMEM;
804 }
805
806 cmd->orig_iov_data_count = iov_count;
807 return 0;
808 }
809
810 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
811 unsigned char *buf)
812 {
813 int data_direction, payload_length;
814 struct iscsi_scsi_req *hdr;
815 int iscsi_task_attr;
816 int sam_task_attr;
817
818 spin_lock_bh(&conn->sess->session_stats_lock);
819 conn->sess->cmd_pdus++;
820 if (conn->sess->se_sess->se_node_acl) {
821 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
822 conn->sess->se_sess->se_node_acl->num_cmds++;
823 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
824 }
825 spin_unlock_bh(&conn->sess->session_stats_lock);
826
827 hdr = (struct iscsi_scsi_req *) buf;
828 payload_length = ntoh24(hdr->dlength);
829
830 /* FIXME; Add checks for AdditionalHeaderSegment */
831
832 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
833 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
834 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
835 " not set. Bad iSCSI Initiator.\n");
836 return iscsit_add_reject_cmd(cmd,
837 ISCSI_REASON_BOOKMARK_INVALID, buf);
838 }
839
840 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
841 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
842 /*
843 * From RFC-3720 Section 10.3.1:
844 *
845 * "Either or both of R and W MAY be 1 when either the
846 * Expected Data Transfer Length and/or Bidirectional Read
847 * Expected Data Transfer Length are 0"
848 *
849 * For this case, go ahead and clear the unnecssary bits
850 * to avoid any confusion with ->data_direction.
851 */
852 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
853 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
854
855 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
856 " set when Expected Data Transfer Length is 0 for"
857 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
858 }
859
860 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
861 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
862 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
863 " MUST be set if Expected Data Transfer Length is not 0."
864 " Bad iSCSI Initiator\n");
865 return iscsit_add_reject_cmd(cmd,
866 ISCSI_REASON_BOOKMARK_INVALID, buf);
867 }
868
869 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
870 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
871 pr_err("Bidirectional operations not supported!\n");
872 return iscsit_add_reject_cmd(cmd,
873 ISCSI_REASON_BOOKMARK_INVALID, buf);
874 }
875
876 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
877 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
878 " Scsi Command PDU.\n");
879 return iscsit_add_reject_cmd(cmd,
880 ISCSI_REASON_BOOKMARK_INVALID, buf);
881 }
882
883 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
884 pr_err("ImmediateData=No but DataSegmentLength=%u,"
885 " protocol error.\n", payload_length);
886 return iscsit_add_reject_cmd(cmd,
887 ISCSI_REASON_PROTOCOL_ERROR, buf);
888 }
889
890 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
891 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
892 pr_err("Expected Data Transfer Length and Length of"
893 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
894 " bit is not set protocol error\n");
895 return iscsit_add_reject_cmd(cmd,
896 ISCSI_REASON_PROTOCOL_ERROR, buf);
897 }
898
899 if (payload_length > be32_to_cpu(hdr->data_length)) {
900 pr_err("DataSegmentLength: %u is greater than"
901 " EDTL: %u, protocol error.\n", payload_length,
902 hdr->data_length);
903 return iscsit_add_reject_cmd(cmd,
904 ISCSI_REASON_PROTOCOL_ERROR, buf);
905 }
906
907 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
908 pr_err("DataSegmentLength: %u is greater than"
909 " MaxXmitDataSegmentLength: %u, protocol error.\n",
910 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
911 return iscsit_add_reject_cmd(cmd,
912 ISCSI_REASON_PROTOCOL_ERROR, buf);
913 }
914
915 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
916 pr_err("DataSegmentLength: %u is greater than"
917 " FirstBurstLength: %u, protocol error.\n",
918 payload_length, conn->sess->sess_ops->FirstBurstLength);
919 return iscsit_add_reject_cmd(cmd,
920 ISCSI_REASON_BOOKMARK_INVALID, buf);
921 }
922
923 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
924 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
925 DMA_NONE;
926
927 cmd->data_direction = data_direction;
928 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
929 /*
930 * Figure out the SAM Task Attribute for the incoming SCSI CDB
931 */
932 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
933 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
934 sam_task_attr = MSG_SIMPLE_TAG;
935 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
936 sam_task_attr = MSG_ORDERED_TAG;
937 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
938 sam_task_attr = MSG_HEAD_TAG;
939 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
940 sam_task_attr = MSG_ACA_TAG;
941 else {
942 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
943 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
944 sam_task_attr = MSG_SIMPLE_TAG;
945 }
946
947 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
948 cmd->i_state = ISTATE_NEW_CMD;
949 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
950 cmd->immediate_data = (payload_length) ? 1 : 0;
951 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
952 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
953 if (cmd->unsolicited_data)
954 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
955
956 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
957 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
958 spin_lock_bh(&conn->sess->ttt_lock);
959 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
960 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
961 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
962 spin_unlock_bh(&conn->sess->ttt_lock);
963 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
964 cmd->targ_xfer_tag = 0xFFFFFFFF;
965 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
966 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
967 cmd->first_burst_len = payload_length;
968
969 if (!conn->sess->sess_ops->RDMAExtensions &&
970 cmd->data_direction == DMA_FROM_DEVICE) {
971 struct iscsi_datain_req *dr;
972
973 dr = iscsit_allocate_datain_req();
974 if (!dr)
975 return iscsit_add_reject_cmd(cmd,
976 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
977
978 iscsit_attach_datain_req(cmd, dr);
979 }
980
981 /*
982 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
983 */
984 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
985 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
986 cmd->data_direction, sam_task_attr,
987 cmd->sense_buffer + 2);
988
989 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
990 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
991 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
992 conn->cid);
993
994 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
995
996 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
997 scsilun_to_int(&hdr->lun));
998 if (cmd->sense_reason)
999 goto attach_cmd;
1000
1001 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1002 if (cmd->sense_reason) {
1003 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1004 return iscsit_add_reject_cmd(cmd,
1005 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1006 }
1007
1008 goto attach_cmd;
1009 }
1010
1011 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1012 return iscsit_add_reject_cmd(cmd,
1013 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1014 }
1015
1016 attach_cmd:
1017 spin_lock_bh(&conn->cmd_lock);
1018 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1019 spin_unlock_bh(&conn->cmd_lock);
1020 /*
1021 * Check if we need to delay processing because of ALUA
1022 * Active/NonOptimized primary access state..
1023 */
1024 core_alua_check_nonop_delay(&cmd->se_cmd);
1025
1026 return 0;
1027 }
1028 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1029
1030 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1031 {
1032 iscsit_set_dataout_sequence_values(cmd);
1033
1034 spin_lock_bh(&cmd->dataout_timeout_lock);
1035 iscsit_start_dataout_timer(cmd, cmd->conn);
1036 spin_unlock_bh(&cmd->dataout_timeout_lock);
1037 }
1038 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1039
1040 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1041 struct iscsi_scsi_req *hdr)
1042 {
1043 int cmdsn_ret = 0;
1044 /*
1045 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1046 * the Immediate Bit is not set, and no Immediate
1047 * Data is attached.
1048 *
1049 * A PDU/CmdSN carrying Immediate Data can only
1050 * be processed after the DataCRC has passed.
1051 * If the DataCRC fails, the CmdSN MUST NOT
1052 * be acknowledged. (See below)
1053 */
1054 if (!cmd->immediate_data) {
1055 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1056 (unsigned char *)hdr, hdr->cmdsn);
1057 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1058 return -1;
1059 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1060 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1061 return 0;
1062 }
1063 }
1064
1065 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1066
1067 /*
1068 * If no Immediate Data is attached, it's OK to return now.
1069 */
1070 if (!cmd->immediate_data) {
1071 if (!cmd->sense_reason && cmd->unsolicited_data)
1072 iscsit_set_unsoliticed_dataout(cmd);
1073 if (!cmd->sense_reason)
1074 return 0;
1075
1076 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1077 return 0;
1078 }
1079
1080 /*
1081 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1082 * execution. These exceptions are processed in CmdSN order using
1083 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1084 */
1085 if (cmd->sense_reason) {
1086 if (cmd->reject_reason)
1087 return 0;
1088
1089 return 1;
1090 }
1091 /*
1092 * Call directly into transport_generic_new_cmd() to perform
1093 * the backend memory allocation.
1094 */
1095 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1096 if (cmd->sense_reason)
1097 return 1;
1098
1099 return 0;
1100 }
1101 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1102
1103 static int
1104 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1105 bool dump_payload)
1106 {
1107 struct iscsi_conn *conn = cmd->conn;
1108 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1109 /*
1110 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1111 */
1112 if (dump_payload == true)
1113 goto after_immediate_data;
1114
1115 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1116 cmd->first_burst_len);
1117 after_immediate_data:
1118 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1119 /*
1120 * A PDU/CmdSN carrying Immediate Data passed
1121 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1122 * Immediate Bit is not set.
1123 */
1124 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1125 (unsigned char *)hdr, hdr->cmdsn);
1126 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1127 return -1;
1128
1129 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1130 int rc;
1131
1132 rc = iscsit_dump_data_payload(cmd->conn,
1133 cmd->first_burst_len, 1);
1134 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1135 return rc;
1136 } else if (cmd->unsolicited_data)
1137 iscsit_set_unsoliticed_dataout(cmd);
1138
1139 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1140 /*
1141 * Immediate Data failed DataCRC and ERL>=1,
1142 * silently drop this PDU and let the initiator
1143 * plug the CmdSN gap.
1144 *
1145 * FIXME: Send Unsolicited NOPIN with reserved
1146 * TTT here to help the initiator figure out
1147 * the missing CmdSN, although they should be
1148 * intelligent enough to determine the missing
1149 * CmdSN and issue a retry to plug the sequence.
1150 */
1151 cmd->i_state = ISTATE_REMOVE;
1152 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1153 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1154 return -1;
1155
1156 return 0;
1157 }
1158
1159 static int
1160 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1161 unsigned char *buf)
1162 {
1163 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1164 int rc, immed_data;
1165 bool dump_payload = false;
1166
1167 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1168 if (rc < 0)
1169 return 0;
1170 /*
1171 * Allocation iovecs needed for struct socket operations for
1172 * traditional iSCSI block I/O.
1173 */
1174 if (iscsit_allocate_iovecs(cmd) < 0) {
1175 return iscsit_add_reject_cmd(cmd,
1176 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1177 }
1178 immed_data = cmd->immediate_data;
1179
1180 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1181 if (rc < 0)
1182 return rc;
1183 else if (rc > 0)
1184 dump_payload = true;
1185
1186 if (!immed_data)
1187 return 0;
1188
1189 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1190 }
1191
1192 static u32 iscsit_do_crypto_hash_sg(
1193 struct hash_desc *hash,
1194 struct iscsi_cmd *cmd,
1195 u32 data_offset,
1196 u32 data_length,
1197 u32 padding,
1198 u8 *pad_bytes)
1199 {
1200 u32 data_crc;
1201 u32 i;
1202 struct scatterlist *sg;
1203 unsigned int page_off;
1204
1205 crypto_hash_init(hash);
1206
1207 sg = cmd->first_data_sg;
1208 page_off = cmd->first_data_sg_off;
1209
1210 i = 0;
1211 while (data_length) {
1212 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1213
1214 crypto_hash_update(hash, &sg[i], cur_len);
1215
1216 data_length -= cur_len;
1217 page_off = 0;
1218 i++;
1219 }
1220
1221 if (padding) {
1222 struct scatterlist pad_sg;
1223
1224 sg_init_one(&pad_sg, pad_bytes, padding);
1225 crypto_hash_update(hash, &pad_sg, padding);
1226 }
1227 crypto_hash_final(hash, (u8 *) &data_crc);
1228
1229 return data_crc;
1230 }
1231
1232 static void iscsit_do_crypto_hash_buf(
1233 struct hash_desc *hash,
1234 const void *buf,
1235 u32 payload_length,
1236 u32 padding,
1237 u8 *pad_bytes,
1238 u8 *data_crc)
1239 {
1240 struct scatterlist sg;
1241
1242 crypto_hash_init(hash);
1243
1244 sg_init_one(&sg, buf, payload_length);
1245 crypto_hash_update(hash, &sg, payload_length);
1246
1247 if (padding) {
1248 sg_init_one(&sg, pad_bytes, padding);
1249 crypto_hash_update(hash, &sg, padding);
1250 }
1251 crypto_hash_final(hash, data_crc);
1252 }
1253
1254 int
1255 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1256 struct iscsi_cmd **out_cmd)
1257 {
1258 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1259 struct iscsi_cmd *cmd = NULL;
1260 struct se_cmd *se_cmd;
1261 u32 payload_length = ntoh24(hdr->dlength);
1262 int rc;
1263
1264 if (!payload_length) {
1265 pr_err("DataOUT payload is ZERO, protocol error.\n");
1266 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1267 buf);
1268 }
1269
1270 /* iSCSI write */
1271 spin_lock_bh(&conn->sess->session_stats_lock);
1272 conn->sess->rx_data_octets += payload_length;
1273 if (conn->sess->se_sess->se_node_acl) {
1274 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1275 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1276 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1277 }
1278 spin_unlock_bh(&conn->sess->session_stats_lock);
1279
1280 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1281 pr_err("DataSegmentLength: %u is greater than"
1282 " MaxXmitDataSegmentLength: %u\n", payload_length,
1283 conn->conn_ops->MaxXmitDataSegmentLength);
1284 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1285 buf);
1286 }
1287
1288 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1289 payload_length);
1290 if (!cmd)
1291 return 0;
1292
1293 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1294 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1295 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1296 payload_length, conn->cid);
1297
1298 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1299 pr_err("Command ITT: 0x%08x received DataOUT after"
1300 " last DataOUT received, dumping payload\n",
1301 cmd->init_task_tag);
1302 return iscsit_dump_data_payload(conn, payload_length, 1);
1303 }
1304
1305 if (cmd->data_direction != DMA_TO_DEVICE) {
1306 pr_err("Command ITT: 0x%08x received DataOUT for a"
1307 " NON-WRITE command.\n", cmd->init_task_tag);
1308 return iscsit_dump_data_payload(conn, payload_length, 1);
1309 }
1310 se_cmd = &cmd->se_cmd;
1311 iscsit_mod_dataout_timer(cmd);
1312
1313 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1314 pr_err("DataOut Offset: %u, Length %u greater than"
1315 " iSCSI Command EDTL %u, protocol error.\n",
1316 hdr->offset, payload_length, cmd->se_cmd.data_length);
1317 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1318 }
1319
1320 if (cmd->unsolicited_data) {
1321 int dump_unsolicited_data = 0;
1322
1323 if (conn->sess->sess_ops->InitialR2T) {
1324 pr_err("Received unexpected unsolicited data"
1325 " while InitialR2T=Yes, protocol error.\n");
1326 transport_send_check_condition_and_sense(&cmd->se_cmd,
1327 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1328 return -1;
1329 }
1330 /*
1331 * Special case for dealing with Unsolicited DataOUT
1332 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1333 * failures;
1334 */
1335
1336 /* Something's amiss if we're not in WRITE_PENDING state... */
1337 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1338 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1339 dump_unsolicited_data = 1;
1340
1341 if (dump_unsolicited_data) {
1342 /*
1343 * Check if a delayed TASK_ABORTED status needs to
1344 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1345 * received with the unsolicitied data out.
1346 */
1347 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1348 iscsit_stop_dataout_timer(cmd);
1349
1350 transport_check_aborted_status(se_cmd,
1351 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1352 return iscsit_dump_data_payload(conn, payload_length, 1);
1353 }
1354 } else {
1355 /*
1356 * For the normal solicited data path:
1357 *
1358 * Check for a delayed TASK_ABORTED status and dump any
1359 * incoming data out payload if one exists. Also, when the
1360 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1361 * data out sequence, we decrement outstanding_r2ts. Once
1362 * outstanding_r2ts reaches zero, go ahead and send the delayed
1363 * TASK_ABORTED status.
1364 */
1365 if (se_cmd->transport_state & CMD_T_ABORTED) {
1366 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1367 if (--cmd->outstanding_r2ts < 1) {
1368 iscsit_stop_dataout_timer(cmd);
1369 transport_check_aborted_status(
1370 se_cmd, 1);
1371 }
1372
1373 return iscsit_dump_data_payload(conn, payload_length, 1);
1374 }
1375 }
1376 /*
1377 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1378 * within-command recovery checks before receiving the payload.
1379 */
1380 rc = iscsit_check_pre_dataout(cmd, buf);
1381 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1382 return 0;
1383 else if (rc == DATAOUT_CANNOT_RECOVER)
1384 return -1;
1385
1386 *out_cmd = cmd;
1387 return 0;
1388 }
1389 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1390
1391 static int
1392 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1393 struct iscsi_data *hdr)
1394 {
1395 struct kvec *iov;
1396 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1397 u32 payload_length = ntoh24(hdr->dlength);
1398 int iov_ret, data_crc_failed = 0;
1399
1400 rx_size += payload_length;
1401 iov = &cmd->iov_data[0];
1402
1403 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1404 payload_length);
1405 if (iov_ret < 0)
1406 return -1;
1407
1408 iov_count += iov_ret;
1409
1410 padding = ((-payload_length) & 3);
1411 if (padding != 0) {
1412 iov[iov_count].iov_base = cmd->pad_bytes;
1413 iov[iov_count++].iov_len = padding;
1414 rx_size += padding;
1415 pr_debug("Receiving %u padding bytes.\n", padding);
1416 }
1417
1418 if (conn->conn_ops->DataDigest) {
1419 iov[iov_count].iov_base = &checksum;
1420 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1421 rx_size += ISCSI_CRC_LEN;
1422 }
1423
1424 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1425
1426 iscsit_unmap_iovec(cmd);
1427
1428 if (rx_got != rx_size)
1429 return -1;
1430
1431 if (conn->conn_ops->DataDigest) {
1432 u32 data_crc;
1433
1434 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1435 be32_to_cpu(hdr->offset),
1436 payload_length, padding,
1437 cmd->pad_bytes);
1438
1439 if (checksum != data_crc) {
1440 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1441 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1442 " does not match computed 0x%08x\n",
1443 hdr->itt, hdr->offset, payload_length,
1444 hdr->datasn, checksum, data_crc);
1445 data_crc_failed = 1;
1446 } else {
1447 pr_debug("Got CRC32C DataDigest 0x%08x for"
1448 " %u bytes of Data Out\n", checksum,
1449 payload_length);
1450 }
1451 }
1452
1453 return data_crc_failed;
1454 }
1455
1456 int
1457 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1458 bool data_crc_failed)
1459 {
1460 struct iscsi_conn *conn = cmd->conn;
1461 int rc, ooo_cmdsn;
1462 /*
1463 * Increment post receive data and CRC values or perform
1464 * within-command recovery.
1465 */
1466 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1467 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1468 return 0;
1469 else if (rc == DATAOUT_SEND_R2T) {
1470 iscsit_set_dataout_sequence_values(cmd);
1471 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1472 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1473 /*
1474 * Handle extra special case for out of order
1475 * Unsolicited Data Out.
1476 */
1477 spin_lock_bh(&cmd->istate_lock);
1478 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1479 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1480 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1481 spin_unlock_bh(&cmd->istate_lock);
1482
1483 iscsit_stop_dataout_timer(cmd);
1484 if (ooo_cmdsn)
1485 return 0;
1486 target_execute_cmd(&cmd->se_cmd);
1487 return 0;
1488 } else /* DATAOUT_CANNOT_RECOVER */
1489 return -1;
1490
1491 return 0;
1492 }
1493 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1494
1495 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1496 {
1497 struct iscsi_cmd *cmd;
1498 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1499 int rc;
1500 bool data_crc_failed = false;
1501
1502 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1503 if (rc < 0)
1504 return 0;
1505 else if (!cmd)
1506 return 0;
1507
1508 rc = iscsit_get_dataout(conn, cmd, hdr);
1509 if (rc < 0)
1510 return rc;
1511 else if (rc > 0)
1512 data_crc_failed = true;
1513
1514 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1515 }
1516
1517 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1518 struct iscsi_nopout *hdr)
1519 {
1520 u32 payload_length = ntoh24(hdr->dlength);
1521
1522 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1523 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1524 " not set, protocol error.\n");
1525 if (!cmd)
1526 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1527 (unsigned char *)hdr);
1528
1529 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1530 (unsigned char *)hdr);
1531 }
1532
1533 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1534 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1535 " greater than MaxXmitDataSegmentLength: %u, protocol"
1536 " error.\n", payload_length,
1537 conn->conn_ops->MaxXmitDataSegmentLength);
1538 if (!cmd)
1539 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1540 (unsigned char *)hdr);
1541
1542 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1543 (unsigned char *)hdr);
1544 }
1545
1546 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1547 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1548 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1549 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1550 payload_length);
1551 /*
1552 * This is not a response to a Unsolicited NopIN, which means
1553 * it can either be a NOPOUT ping request (with a valid ITT),
1554 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1555 * Either way, make sure we allocate an struct iscsi_cmd, as both
1556 * can contain ping data.
1557 */
1558 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1559 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1560 cmd->i_state = ISTATE_SEND_NOPIN;
1561 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1562 1 : 0);
1563 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1564 cmd->targ_xfer_tag = 0xFFFFFFFF;
1565 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1566 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1567 cmd->data_direction = DMA_NONE;
1568 }
1569
1570 return 0;
1571 }
1572 EXPORT_SYMBOL(iscsit_setup_nop_out);
1573
1574 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1575 struct iscsi_nopout *hdr)
1576 {
1577 struct iscsi_cmd *cmd_p = NULL;
1578 int cmdsn_ret = 0;
1579 /*
1580 * Initiator is expecting a NopIN ping reply..
1581 */
1582 if (hdr->itt != RESERVED_ITT) {
1583 if (!cmd)
1584 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1585 (unsigned char *)hdr);
1586
1587 spin_lock_bh(&conn->cmd_lock);
1588 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1589 spin_unlock_bh(&conn->cmd_lock);
1590
1591 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1592
1593 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1594 iscsit_add_cmd_to_response_queue(cmd, conn,
1595 cmd->i_state);
1596 return 0;
1597 }
1598
1599 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1600 (unsigned char *)hdr, hdr->cmdsn);
1601 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1602 return 0;
1603 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1604 return -1;
1605
1606 return 0;
1607 }
1608 /*
1609 * This was a response to a unsolicited NOPIN ping.
1610 */
1611 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1612 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1613 if (!cmd_p)
1614 return -EINVAL;
1615
1616 iscsit_stop_nopin_response_timer(conn);
1617
1618 cmd_p->i_state = ISTATE_REMOVE;
1619 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1620
1621 iscsit_start_nopin_timer(conn);
1622 return 0;
1623 }
1624 /*
1625 * Otherwise, initiator is not expecting a NOPIN is response.
1626 * Just ignore for now.
1627 */
1628 return 0;
1629 }
1630 EXPORT_SYMBOL(iscsit_process_nop_out);
1631
1632 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1633 unsigned char *buf)
1634 {
1635 unsigned char *ping_data = NULL;
1636 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1637 struct kvec *iov = NULL;
1638 u32 payload_length = ntoh24(hdr->dlength);
1639 int ret;
1640
1641 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1642 if (ret < 0)
1643 return 0;
1644 /*
1645 * Handle NOP-OUT payload for traditional iSCSI sockets
1646 */
1647 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1648 u32 checksum, data_crc, padding = 0;
1649 int niov = 0, rx_got, rx_size = payload_length;
1650
1651 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1652 if (!ping_data) {
1653 pr_err("Unable to allocate memory for"
1654 " NOPOUT ping data.\n");
1655 ret = -1;
1656 goto out;
1657 }
1658
1659 iov = &cmd->iov_misc[0];
1660 iov[niov].iov_base = ping_data;
1661 iov[niov++].iov_len = payload_length;
1662
1663 padding = ((-payload_length) & 3);
1664 if (padding != 0) {
1665 pr_debug("Receiving %u additional bytes"
1666 " for padding.\n", padding);
1667 iov[niov].iov_base = &cmd->pad_bytes;
1668 iov[niov++].iov_len = padding;
1669 rx_size += padding;
1670 }
1671 if (conn->conn_ops->DataDigest) {
1672 iov[niov].iov_base = &checksum;
1673 iov[niov++].iov_len = ISCSI_CRC_LEN;
1674 rx_size += ISCSI_CRC_LEN;
1675 }
1676
1677 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1678 if (rx_got != rx_size) {
1679 ret = -1;
1680 goto out;
1681 }
1682
1683 if (conn->conn_ops->DataDigest) {
1684 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1685 ping_data, payload_length,
1686 padding, cmd->pad_bytes,
1687 (u8 *)&data_crc);
1688
1689 if (checksum != data_crc) {
1690 pr_err("Ping data CRC32C DataDigest"
1691 " 0x%08x does not match computed 0x%08x\n",
1692 checksum, data_crc);
1693 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1694 pr_err("Unable to recover from"
1695 " NOPOUT Ping DataCRC failure while in"
1696 " ERL=0.\n");
1697 ret = -1;
1698 goto out;
1699 } else {
1700 /*
1701 * Silently drop this PDU and let the
1702 * initiator plug the CmdSN gap.
1703 */
1704 pr_debug("Dropping NOPOUT"
1705 " Command CmdSN: 0x%08x due to"
1706 " DataCRC error.\n", hdr->cmdsn);
1707 ret = 0;
1708 goto out;
1709 }
1710 } else {
1711 pr_debug("Got CRC32C DataDigest"
1712 " 0x%08x for %u bytes of ping data.\n",
1713 checksum, payload_length);
1714 }
1715 }
1716
1717 ping_data[payload_length] = '\0';
1718 /*
1719 * Attach ping data to struct iscsi_cmd->buf_ptr.
1720 */
1721 cmd->buf_ptr = ping_data;
1722 cmd->buf_ptr_size = payload_length;
1723
1724 pr_debug("Got %u bytes of NOPOUT ping"
1725 " data.\n", payload_length);
1726 pr_debug("Ping Data: \"%s\"\n", ping_data);
1727 }
1728
1729 return iscsit_process_nop_out(conn, cmd, hdr);
1730 out:
1731 if (cmd)
1732 iscsit_free_cmd(cmd, false);
1733
1734 kfree(ping_data);
1735 return ret;
1736 }
1737
1738 int
1739 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1740 unsigned char *buf)
1741 {
1742 struct se_tmr_req *se_tmr;
1743 struct iscsi_tmr_req *tmr_req;
1744 struct iscsi_tm *hdr;
1745 int out_of_order_cmdsn = 0, ret;
1746 bool sess_ref = false;
1747 u8 function;
1748
1749 hdr = (struct iscsi_tm *) buf;
1750 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1751 function = hdr->flags;
1752
1753 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1754 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1755 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1756 hdr->rtt, hdr->refcmdsn, conn->cid);
1757
1758 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1759 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1760 hdr->rtt != RESERVED_ITT)) {
1761 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1762 hdr->rtt = RESERVED_ITT;
1763 }
1764
1765 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1766 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1767 pr_err("Task Management Request TASK_REASSIGN not"
1768 " issued as immediate command, bad iSCSI Initiator"
1769 "implementation\n");
1770 return iscsit_add_reject_cmd(cmd,
1771 ISCSI_REASON_PROTOCOL_ERROR, buf);
1772 }
1773 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1774 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1775 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1776
1777 cmd->data_direction = DMA_NONE;
1778
1779 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1780 if (!cmd->tmr_req) {
1781 pr_err("Unable to allocate memory for"
1782 " Task Management command!\n");
1783 return iscsit_add_reject_cmd(cmd,
1784 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1785 buf);
1786 }
1787
1788 /*
1789 * TASK_REASSIGN for ERL=2 / connection stays inside of
1790 * LIO-Target $FABRIC_MOD
1791 */
1792 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1793
1794 u8 tcm_function;
1795 int ret;
1796
1797 transport_init_se_cmd(&cmd->se_cmd,
1798 &lio_target_fabric_configfs->tf_ops,
1799 conn->sess->se_sess, 0, DMA_NONE,
1800 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1801
1802 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1803 sess_ref = true;
1804
1805 switch (function) {
1806 case ISCSI_TM_FUNC_ABORT_TASK:
1807 tcm_function = TMR_ABORT_TASK;
1808 break;
1809 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1810 tcm_function = TMR_ABORT_TASK_SET;
1811 break;
1812 case ISCSI_TM_FUNC_CLEAR_ACA:
1813 tcm_function = TMR_CLEAR_ACA;
1814 break;
1815 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1816 tcm_function = TMR_CLEAR_TASK_SET;
1817 break;
1818 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1819 tcm_function = TMR_LUN_RESET;
1820 break;
1821 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1822 tcm_function = TMR_TARGET_WARM_RESET;
1823 break;
1824 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1825 tcm_function = TMR_TARGET_COLD_RESET;
1826 break;
1827 default:
1828 pr_err("Unknown iSCSI TMR Function:"
1829 " 0x%02x\n", function);
1830 return iscsit_add_reject_cmd(cmd,
1831 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1832 }
1833
1834 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1835 tcm_function, GFP_KERNEL);
1836 if (ret < 0)
1837 return iscsit_add_reject_cmd(cmd,
1838 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1839
1840 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1841 }
1842
1843 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1844 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1845 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1846 cmd->init_task_tag = hdr->itt;
1847 cmd->targ_xfer_tag = 0xFFFFFFFF;
1848 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1849 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1850 se_tmr = cmd->se_cmd.se_tmr_req;
1851 tmr_req = cmd->tmr_req;
1852 /*
1853 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1854 */
1855 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1856 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1857 scsilun_to_int(&hdr->lun));
1858 if (ret < 0) {
1859 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1860 goto attach;
1861 }
1862 }
1863
1864 switch (function) {
1865 case ISCSI_TM_FUNC_ABORT_TASK:
1866 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1867 if (se_tmr->response)
1868 goto attach;
1869 break;
1870 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1871 case ISCSI_TM_FUNC_CLEAR_ACA:
1872 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1873 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1874 break;
1875 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1876 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1877 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1878 goto attach;
1879 }
1880 break;
1881 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1882 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1883 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1884 goto attach;
1885 }
1886 break;
1887 case ISCSI_TM_FUNC_TASK_REASSIGN:
1888 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1889 /*
1890 * Perform sanity checks on the ExpDataSN only if the
1891 * TASK_REASSIGN was successful.
1892 */
1893 if (se_tmr->response)
1894 break;
1895
1896 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1897 return iscsit_add_reject_cmd(cmd,
1898 ISCSI_REASON_BOOKMARK_INVALID, buf);
1899 break;
1900 default:
1901 pr_err("Unknown TMR function: 0x%02x, protocol"
1902 " error.\n", function);
1903 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1904 goto attach;
1905 }
1906
1907 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1908 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1909 se_tmr->call_transport = 1;
1910 attach:
1911 spin_lock_bh(&conn->cmd_lock);
1912 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1913 spin_unlock_bh(&conn->cmd_lock);
1914
1915 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1916 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1917 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1918 out_of_order_cmdsn = 1;
1919 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1920 return 0;
1921 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1922 return -1;
1923 }
1924 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1925
1926 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1927 return 0;
1928 /*
1929 * Found the referenced task, send to transport for processing.
1930 */
1931 if (se_tmr->call_transport)
1932 return transport_generic_handle_tmr(&cmd->se_cmd);
1933
1934 /*
1935 * Could not find the referenced LUN, task, or Task Management
1936 * command not authorized or supported. Change state and
1937 * let the tx_thread send the response.
1938 *
1939 * For connection recovery, this is also the default action for
1940 * TMR TASK_REASSIGN.
1941 */
1942 if (sess_ref) {
1943 pr_debug("Handle TMR, using sess_ref=true check\n");
1944 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1945 }
1946
1947 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1948 return 0;
1949 }
1950 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1951
1952 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1953 int
1954 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1955 struct iscsi_text *hdr)
1956 {
1957 u32 payload_length = ntoh24(hdr->dlength);
1958
1959 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1960 pr_err("Unable to accept text parameter length: %u"
1961 "greater than MaxXmitDataSegmentLength %u.\n",
1962 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1963 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1964 (unsigned char *)hdr);
1965 }
1966
1967 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1968 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1969 hdr->exp_statsn, payload_length);
1970
1971 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1972 cmd->i_state = ISTATE_SEND_TEXTRSP;
1973 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1974 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1975 cmd->targ_xfer_tag = 0xFFFFFFFF;
1976 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1977 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1978 cmd->data_direction = DMA_NONE;
1979
1980 return 0;
1981 }
1982 EXPORT_SYMBOL(iscsit_setup_text_cmd);
1983
1984 int
1985 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1986 struct iscsi_text *hdr)
1987 {
1988 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
1989 int cmdsn_ret;
1990
1991 if (!text_in) {
1992 pr_err("Unable to locate text_in buffer for sendtargets"
1993 " discovery\n");
1994 goto reject;
1995 }
1996 if (strncmp("SendTargets", text_in, 11) != 0) {
1997 pr_err("Received Text Data that is not"
1998 " SendTargets, cannot continue.\n");
1999 goto reject;
2000 }
2001 text_ptr = strchr(text_in, '=');
2002 if (!text_ptr) {
2003 pr_err("No \"=\" separator found in Text Data,"
2004 " cannot continue.\n");
2005 goto reject;
2006 }
2007 if (!strncmp("=All", text_ptr, 4)) {
2008 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
2009 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2010 !strncmp("=eui.", text_ptr, 5)) {
2011 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
2012 } else {
2013 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2014 goto reject;
2015 }
2016
2017 spin_lock_bh(&conn->cmd_lock);
2018 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2019 spin_unlock_bh(&conn->cmd_lock);
2020
2021 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2022
2023 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2024 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2025 (unsigned char *)hdr, hdr->cmdsn);
2026 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2027 return -1;
2028
2029 return 0;
2030 }
2031
2032 return iscsit_execute_cmd(cmd, 0);
2033
2034 reject:
2035 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2036 (unsigned char *)hdr);
2037 }
2038 EXPORT_SYMBOL(iscsit_process_text_cmd);
2039
2040 static int
2041 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2042 unsigned char *buf)
2043 {
2044 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2045 char *text_in = NULL;
2046 u32 payload_length = ntoh24(hdr->dlength);
2047 int rx_size, rc;
2048
2049 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2050 if (rc < 0)
2051 return 0;
2052
2053 rx_size = payload_length;
2054 if (payload_length) {
2055 u32 checksum = 0, data_crc = 0;
2056 u32 padding = 0, pad_bytes = 0;
2057 int niov = 0, rx_got;
2058 struct kvec iov[3];
2059
2060 text_in = kzalloc(payload_length, GFP_KERNEL);
2061 if (!text_in) {
2062 pr_err("Unable to allocate memory for"
2063 " incoming text parameters\n");
2064 goto reject;
2065 }
2066 cmd->text_in_ptr = text_in;
2067
2068 memset(iov, 0, 3 * sizeof(struct kvec));
2069 iov[niov].iov_base = text_in;
2070 iov[niov++].iov_len = payload_length;
2071
2072 padding = ((-payload_length) & 3);
2073 if (padding != 0) {
2074 iov[niov].iov_base = &pad_bytes;
2075 iov[niov++].iov_len = padding;
2076 rx_size += padding;
2077 pr_debug("Receiving %u additional bytes"
2078 " for padding.\n", padding);
2079 }
2080 if (conn->conn_ops->DataDigest) {
2081 iov[niov].iov_base = &checksum;
2082 iov[niov++].iov_len = ISCSI_CRC_LEN;
2083 rx_size += ISCSI_CRC_LEN;
2084 }
2085
2086 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2087 if (rx_got != rx_size)
2088 goto reject;
2089
2090 if (conn->conn_ops->DataDigest) {
2091 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2092 text_in, payload_length,
2093 padding, (u8 *)&pad_bytes,
2094 (u8 *)&data_crc);
2095
2096 if (checksum != data_crc) {
2097 pr_err("Text data CRC32C DataDigest"
2098 " 0x%08x does not match computed"
2099 " 0x%08x\n", checksum, data_crc);
2100 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2101 pr_err("Unable to recover from"
2102 " Text Data digest failure while in"
2103 " ERL=0.\n");
2104 goto reject;
2105 } else {
2106 /*
2107 * Silently drop this PDU and let the
2108 * initiator plug the CmdSN gap.
2109 */
2110 pr_debug("Dropping Text"
2111 " Command CmdSN: 0x%08x due to"
2112 " DataCRC error.\n", hdr->cmdsn);
2113 kfree(text_in);
2114 return 0;
2115 }
2116 } else {
2117 pr_debug("Got CRC32C DataDigest"
2118 " 0x%08x for %u bytes of text data.\n",
2119 checksum, payload_length);
2120 }
2121 }
2122 text_in[payload_length - 1] = '\0';
2123 pr_debug("Successfully read %d bytes of text"
2124 " data.\n", payload_length);
2125 }
2126
2127 return iscsit_process_text_cmd(conn, cmd, hdr);
2128
2129 reject:
2130 kfree(cmd->text_in_ptr);
2131 cmd->text_in_ptr = NULL;
2132 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2133 }
2134 EXPORT_SYMBOL(iscsit_handle_text_cmd);
2135
2136 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2137 {
2138 struct iscsi_conn *conn_p;
2139 struct iscsi_session *sess = conn->sess;
2140
2141 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2142 " for SID: %u.\n", conn->cid, conn->sess->sid);
2143
2144 atomic_set(&sess->session_logout, 1);
2145 atomic_set(&conn->conn_logout_remove, 1);
2146 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2147
2148 iscsit_inc_conn_usage_count(conn);
2149 iscsit_inc_session_usage_count(sess);
2150
2151 spin_lock_bh(&sess->conn_lock);
2152 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2153 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2154 continue;
2155
2156 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2157 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2158 }
2159 spin_unlock_bh(&sess->conn_lock);
2160
2161 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2162
2163 return 0;
2164 }
2165
2166 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2167 {
2168 struct iscsi_conn *l_conn;
2169 struct iscsi_session *sess = conn->sess;
2170
2171 pr_debug("Received logout request CLOSECONNECTION for CID:"
2172 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2173
2174 /*
2175 * A Logout Request with a CLOSECONNECTION reason code for a CID
2176 * can arrive on a connection with a differing CID.
2177 */
2178 if (conn->cid == cmd->logout_cid) {
2179 spin_lock_bh(&conn->state_lock);
2180 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2181 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2182
2183 atomic_set(&conn->conn_logout_remove, 1);
2184 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2185 iscsit_inc_conn_usage_count(conn);
2186
2187 spin_unlock_bh(&conn->state_lock);
2188 } else {
2189 /*
2190 * Handle all different cid CLOSECONNECTION requests in
2191 * iscsit_logout_post_handler_diffcid() as to give enough
2192 * time for any non immediate command's CmdSN to be
2193 * acknowledged on the connection in question.
2194 *
2195 * Here we simply make sure the CID is still around.
2196 */
2197 l_conn = iscsit_get_conn_from_cid(sess,
2198 cmd->logout_cid);
2199 if (!l_conn) {
2200 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2201 iscsit_add_cmd_to_response_queue(cmd, conn,
2202 cmd->i_state);
2203 return 0;
2204 }
2205
2206 iscsit_dec_conn_usage_count(l_conn);
2207 }
2208
2209 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2210
2211 return 0;
2212 }
2213
2214 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2215 {
2216 struct iscsi_session *sess = conn->sess;
2217
2218 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2219 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2220
2221 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2222 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2223 " while ERL!=2.\n");
2224 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2225 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2226 return 0;
2227 }
2228
2229 if (conn->cid == cmd->logout_cid) {
2230 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2231 " with CID: %hu on CID: %hu, implementation error.\n",
2232 cmd->logout_cid, conn->cid);
2233 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2234 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2235 return 0;
2236 }
2237
2238 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2239
2240 return 0;
2241 }
2242
2243 int
2244 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2245 unsigned char *buf)
2246 {
2247 int cmdsn_ret, logout_remove = 0;
2248 u8 reason_code = 0;
2249 struct iscsi_logout *hdr;
2250 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2251
2252 hdr = (struct iscsi_logout *) buf;
2253 reason_code = (hdr->flags & 0x7f);
2254
2255 if (tiqn) {
2256 spin_lock(&tiqn->logout_stats.lock);
2257 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2258 tiqn->logout_stats.normal_logouts++;
2259 else
2260 tiqn->logout_stats.abnormal_logouts++;
2261 spin_unlock(&tiqn->logout_stats.lock);
2262 }
2263
2264 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2265 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2266 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2267 hdr->cid, conn->cid);
2268
2269 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2270 pr_err("Received logout request on connection that"
2271 " is not in logged in state, ignoring request.\n");
2272 iscsit_free_cmd(cmd, false);
2273 return 0;
2274 }
2275
2276 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2277 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2278 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2279 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2280 cmd->targ_xfer_tag = 0xFFFFFFFF;
2281 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2282 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2283 cmd->logout_cid = be16_to_cpu(hdr->cid);
2284 cmd->logout_reason = reason_code;
2285 cmd->data_direction = DMA_NONE;
2286
2287 /*
2288 * We need to sleep in these cases (by returning 1) until the Logout
2289 * Response gets sent in the tx thread.
2290 */
2291 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2292 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2293 be16_to_cpu(hdr->cid) == conn->cid))
2294 logout_remove = 1;
2295
2296 spin_lock_bh(&conn->cmd_lock);
2297 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2298 spin_unlock_bh(&conn->cmd_lock);
2299
2300 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2301 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2302
2303 /*
2304 * Immediate commands are executed, well, immediately.
2305 * Non-Immediate Logout Commands are executed in CmdSN order.
2306 */
2307 if (cmd->immediate_cmd) {
2308 int ret = iscsit_execute_cmd(cmd, 0);
2309
2310 if (ret < 0)
2311 return ret;
2312 } else {
2313 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2314 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2315 logout_remove = 0;
2316 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2317 return -1;
2318 }
2319
2320 return logout_remove;
2321 }
2322 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2323
2324 static int iscsit_handle_snack(
2325 struct iscsi_conn *conn,
2326 unsigned char *buf)
2327 {
2328 struct iscsi_snack *hdr;
2329
2330 hdr = (struct iscsi_snack *) buf;
2331 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2332
2333 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2334 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2335 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2336 hdr->begrun, hdr->runlength, conn->cid);
2337
2338 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2339 pr_err("Initiator sent SNACK request while in"
2340 " ErrorRecoveryLevel=0.\n");
2341 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2342 buf);
2343 }
2344 /*
2345 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2346 * call from inside iscsi_send_recovery_datain_or_r2t().
2347 */
2348 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2349 case 0:
2350 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2351 hdr->itt,
2352 be32_to_cpu(hdr->ttt),
2353 be32_to_cpu(hdr->begrun),
2354 be32_to_cpu(hdr->runlength));
2355 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2356 return iscsit_handle_status_snack(conn, hdr->itt,
2357 be32_to_cpu(hdr->ttt),
2358 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2359 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2360 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2361 be32_to_cpu(hdr->begrun),
2362 be32_to_cpu(hdr->runlength));
2363 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2364 /* FIXME: Support R-Data SNACK */
2365 pr_err("R-Data SNACK Not Supported.\n");
2366 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2367 buf);
2368 default:
2369 pr_err("Unknown SNACK type 0x%02x, protocol"
2370 " error.\n", hdr->flags & 0x0f);
2371 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2372 buf);
2373 }
2374
2375 return 0;
2376 }
2377
2378 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2379 {
2380 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2381 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2382 wait_for_completion_interruptible_timeout(
2383 &conn->rx_half_close_comp,
2384 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2385 }
2386 }
2387
2388 static int iscsit_handle_immediate_data(
2389 struct iscsi_cmd *cmd,
2390 struct iscsi_scsi_req *hdr,
2391 u32 length)
2392 {
2393 int iov_ret, rx_got = 0, rx_size = 0;
2394 u32 checksum, iov_count = 0, padding = 0;
2395 struct iscsi_conn *conn = cmd->conn;
2396 struct kvec *iov;
2397
2398 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2399 if (iov_ret < 0)
2400 return IMMEDIATE_DATA_CANNOT_RECOVER;
2401
2402 rx_size = length;
2403 iov_count = iov_ret;
2404 iov = &cmd->iov_data[0];
2405
2406 padding = ((-length) & 3);
2407 if (padding != 0) {
2408 iov[iov_count].iov_base = cmd->pad_bytes;
2409 iov[iov_count++].iov_len = padding;
2410 rx_size += padding;
2411 }
2412
2413 if (conn->conn_ops->DataDigest) {
2414 iov[iov_count].iov_base = &checksum;
2415 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2416 rx_size += ISCSI_CRC_LEN;
2417 }
2418
2419 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2420
2421 iscsit_unmap_iovec(cmd);
2422
2423 if (rx_got != rx_size) {
2424 iscsit_rx_thread_wait_for_tcp(conn);
2425 return IMMEDIATE_DATA_CANNOT_RECOVER;
2426 }
2427
2428 if (conn->conn_ops->DataDigest) {
2429 u32 data_crc;
2430
2431 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2432 cmd->write_data_done, length, padding,
2433 cmd->pad_bytes);
2434
2435 if (checksum != data_crc) {
2436 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2437 " does not match computed 0x%08x\n", checksum,
2438 data_crc);
2439
2440 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2441 pr_err("Unable to recover from"
2442 " Immediate Data digest failure while"
2443 " in ERL=0.\n");
2444 iscsit_reject_cmd(cmd,
2445 ISCSI_REASON_DATA_DIGEST_ERROR,
2446 (unsigned char *)hdr);
2447 return IMMEDIATE_DATA_CANNOT_RECOVER;
2448 } else {
2449 iscsit_reject_cmd(cmd,
2450 ISCSI_REASON_DATA_DIGEST_ERROR,
2451 (unsigned char *)hdr);
2452 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2453 }
2454 } else {
2455 pr_debug("Got CRC32C DataDigest 0x%08x for"
2456 " %u bytes of Immediate Data\n", checksum,
2457 length);
2458 }
2459 }
2460
2461 cmd->write_data_done += length;
2462
2463 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2464 spin_lock_bh(&cmd->istate_lock);
2465 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2466 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2467 spin_unlock_bh(&cmd->istate_lock);
2468 }
2469
2470 return IMMEDIATE_DATA_NORMAL_OPERATION;
2471 }
2472
2473 /*
2474 * Called with sess->conn_lock held.
2475 */
2476 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2477 with active network interface */
2478 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2479 {
2480 struct iscsi_cmd *cmd;
2481 struct iscsi_conn *conn_p;
2482 bool found = false;
2483
2484 /*
2485 * Only send a Asynchronous Message on connections whos network
2486 * interface is still functional.
2487 */
2488 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2489 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2490 iscsit_inc_conn_usage_count(conn_p);
2491 found = true;
2492 break;
2493 }
2494 }
2495
2496 if (!found)
2497 return;
2498
2499 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
2500 if (!cmd) {
2501 iscsit_dec_conn_usage_count(conn_p);
2502 return;
2503 }
2504
2505 cmd->logout_cid = conn->cid;
2506 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2507 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2508
2509 spin_lock_bh(&conn_p->cmd_lock);
2510 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2511 spin_unlock_bh(&conn_p->cmd_lock);
2512
2513 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2514 iscsit_dec_conn_usage_count(conn_p);
2515 }
2516
2517 static int iscsit_send_conn_drop_async_message(
2518 struct iscsi_cmd *cmd,
2519 struct iscsi_conn *conn)
2520 {
2521 struct iscsi_async *hdr;
2522
2523 cmd->tx_size = ISCSI_HDR_LEN;
2524 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2525
2526 hdr = (struct iscsi_async *) cmd->pdu;
2527 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2528 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2529 cmd->init_task_tag = RESERVED_ITT;
2530 cmd->targ_xfer_tag = 0xFFFFFFFF;
2531 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2532 cmd->stat_sn = conn->stat_sn++;
2533 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2534 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2535 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2536 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2537 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2538 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2539 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2540
2541 if (conn->conn_ops->HeaderDigest) {
2542 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2543
2544 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2545 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2546
2547 cmd->tx_size += ISCSI_CRC_LEN;
2548 pr_debug("Attaching CRC32C HeaderDigest to"
2549 " Async Message 0x%08x\n", *header_digest);
2550 }
2551
2552 cmd->iov_misc[0].iov_base = cmd->pdu;
2553 cmd->iov_misc[0].iov_len = cmd->tx_size;
2554 cmd->iov_misc_count = 1;
2555
2556 pr_debug("Sending Connection Dropped Async Message StatSN:"
2557 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2558 cmd->logout_cid, conn->cid);
2559 return 0;
2560 }
2561
2562 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2563 {
2564 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2565 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2566 wait_for_completion_interruptible_timeout(
2567 &conn->tx_half_close_comp,
2568 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2569 }
2570 }
2571
2572 static void
2573 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2574 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2575 bool set_statsn)
2576 {
2577 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2578 hdr->flags = datain->flags;
2579 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2580 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2581 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2582 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2583 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2584 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2585 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2586 }
2587 }
2588 hton24(hdr->dlength, datain->length);
2589 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2590 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2591 (struct scsi_lun *)&hdr->lun);
2592 else
2593 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2594
2595 hdr->itt = cmd->init_task_tag;
2596
2597 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2598 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2599 else
2600 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2601 if (set_statsn)
2602 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2603 else
2604 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2605
2606 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2607 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2608 hdr->datasn = cpu_to_be32(datain->data_sn);
2609 hdr->offset = cpu_to_be32(datain->offset);
2610
2611 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2612 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2613 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2614 ntohl(hdr->offset), datain->length, conn->cid);
2615 }
2616
2617 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2618 {
2619 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2620 struct iscsi_datain datain;
2621 struct iscsi_datain_req *dr;
2622 struct kvec *iov;
2623 u32 iov_count = 0, tx_size = 0;
2624 int eodr = 0, ret, iov_ret;
2625 bool set_statsn = false;
2626
2627 memset(&datain, 0, sizeof(struct iscsi_datain));
2628 dr = iscsit_get_datain_values(cmd, &datain);
2629 if (!dr) {
2630 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2631 cmd->init_task_tag);
2632 return -1;
2633 }
2634 /*
2635 * Be paranoid and double check the logic for now.
2636 */
2637 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2638 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2639 " datain.length: %u exceeds cmd->data_length: %u\n",
2640 cmd->init_task_tag, datain.offset, datain.length,
2641 cmd->se_cmd.data_length);
2642 return -1;
2643 }
2644
2645 spin_lock_bh(&conn->sess->session_stats_lock);
2646 conn->sess->tx_data_octets += datain.length;
2647 if (conn->sess->se_sess->se_node_acl) {
2648 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2649 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2650 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2651 }
2652 spin_unlock_bh(&conn->sess->session_stats_lock);
2653 /*
2654 * Special case for successfully execution w/ both DATAIN
2655 * and Sense Data.
2656 */
2657 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2658 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2659 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2660 else {
2661 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2662 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2663 iscsit_increment_maxcmdsn(cmd, conn->sess);
2664 cmd->stat_sn = conn->stat_sn++;
2665 set_statsn = true;
2666 } else if (dr->dr_complete ==
2667 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2668 set_statsn = true;
2669 }
2670
2671 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2672
2673 iov = &cmd->iov_data[0];
2674 iov[iov_count].iov_base = cmd->pdu;
2675 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2676 tx_size += ISCSI_HDR_LEN;
2677
2678 if (conn->conn_ops->HeaderDigest) {
2679 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2680
2681 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2682 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2683
2684 iov[0].iov_len += ISCSI_CRC_LEN;
2685 tx_size += ISCSI_CRC_LEN;
2686
2687 pr_debug("Attaching CRC32 HeaderDigest"
2688 " for DataIN PDU 0x%08x\n", *header_digest);
2689 }
2690
2691 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2692 datain.offset, datain.length);
2693 if (iov_ret < 0)
2694 return -1;
2695
2696 iov_count += iov_ret;
2697 tx_size += datain.length;
2698
2699 cmd->padding = ((-datain.length) & 3);
2700 if (cmd->padding) {
2701 iov[iov_count].iov_base = cmd->pad_bytes;
2702 iov[iov_count++].iov_len = cmd->padding;
2703 tx_size += cmd->padding;
2704
2705 pr_debug("Attaching %u padding bytes\n",
2706 cmd->padding);
2707 }
2708 if (conn->conn_ops->DataDigest) {
2709 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2710 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2711
2712 iov[iov_count].iov_base = &cmd->data_crc;
2713 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2714 tx_size += ISCSI_CRC_LEN;
2715
2716 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2717 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2718 }
2719
2720 cmd->iov_data_count = iov_count;
2721 cmd->tx_size = tx_size;
2722
2723 /* sendpage is preferred but can't insert markers */
2724 if (!conn->conn_ops->IFMarker)
2725 ret = iscsit_fe_sendpage_sg(cmd, conn);
2726 else
2727 ret = iscsit_send_tx_data(cmd, conn, 0);
2728
2729 iscsit_unmap_iovec(cmd);
2730
2731 if (ret < 0) {
2732 iscsit_tx_thread_wait_for_tcp(conn);
2733 return ret;
2734 }
2735
2736 if (dr->dr_complete) {
2737 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2738 2 : 1;
2739 iscsit_free_datain_req(cmd, dr);
2740 }
2741
2742 return eodr;
2743 }
2744
2745 int
2746 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2747 struct iscsi_logout_rsp *hdr)
2748 {
2749 struct iscsi_conn *logout_conn = NULL;
2750 struct iscsi_conn_recovery *cr = NULL;
2751 struct iscsi_session *sess = conn->sess;
2752 /*
2753 * The actual shutting down of Sessions and/or Connections
2754 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2755 * is done in scsi_logout_post_handler().
2756 */
2757 switch (cmd->logout_reason) {
2758 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2759 pr_debug("iSCSI session logout successful, setting"
2760 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2761 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2762 break;
2763 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2764 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2765 break;
2766 /*
2767 * For CLOSECONNECTION logout requests carrying
2768 * a matching logout CID -> local CID, the reference
2769 * for the local CID will have been incremented in
2770 * iscsi_logout_closeconnection().
2771 *
2772 * For CLOSECONNECTION logout requests carrying
2773 * a different CID than the connection it arrived
2774 * on, the connection responding to cmd->logout_cid
2775 * is stopped in iscsit_logout_post_handler_diffcid().
2776 */
2777
2778 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2779 " successful.\n", cmd->logout_cid, conn->cid);
2780 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2781 break;
2782 case ISCSI_LOGOUT_REASON_RECOVERY:
2783 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2784 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2785 break;
2786 /*
2787 * If the connection is still active from our point of view
2788 * force connection recovery to occur.
2789 */
2790 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2791 cmd->logout_cid);
2792 if (logout_conn) {
2793 iscsit_connection_reinstatement_rcfr(logout_conn);
2794 iscsit_dec_conn_usage_count(logout_conn);
2795 }
2796
2797 cr = iscsit_get_inactive_connection_recovery_entry(
2798 conn->sess, cmd->logout_cid);
2799 if (!cr) {
2800 pr_err("Unable to locate CID: %hu for"
2801 " REMOVECONNFORRECOVERY Logout Request.\n",
2802 cmd->logout_cid);
2803 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2804 break;
2805 }
2806
2807 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2808
2809 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2810 " for recovery for CID: %hu on CID: %hu successful.\n",
2811 cmd->logout_cid, conn->cid);
2812 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2813 break;
2814 default:
2815 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2816 cmd->logout_reason);
2817 return -1;
2818 }
2819
2820 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2821 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2822 hdr->response = cmd->logout_response;
2823 hdr->itt = cmd->init_task_tag;
2824 cmd->stat_sn = conn->stat_sn++;
2825 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2826
2827 iscsit_increment_maxcmdsn(cmd, conn->sess);
2828 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2829 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2830
2831 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2832 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2833 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2834 cmd->logout_cid, conn->cid);
2835
2836 return 0;
2837 }
2838 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2839
2840 static int
2841 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2842 {
2843 struct kvec *iov;
2844 int niov = 0, tx_size, rc;
2845
2846 rc = iscsit_build_logout_rsp(cmd, conn,
2847 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2848 if (rc < 0)
2849 return rc;
2850
2851 tx_size = ISCSI_HDR_LEN;
2852 iov = &cmd->iov_misc[0];
2853 iov[niov].iov_base = cmd->pdu;
2854 iov[niov++].iov_len = ISCSI_HDR_LEN;
2855
2856 if (conn->conn_ops->HeaderDigest) {
2857 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2858
2859 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2860 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2861
2862 iov[0].iov_len += ISCSI_CRC_LEN;
2863 tx_size += ISCSI_CRC_LEN;
2864 pr_debug("Attaching CRC32C HeaderDigest to"
2865 " Logout Response 0x%08x\n", *header_digest);
2866 }
2867 cmd->iov_misc_count = niov;
2868 cmd->tx_size = tx_size;
2869
2870 return 0;
2871 }
2872
2873 void
2874 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2875 struct iscsi_nopin *hdr, bool nopout_response)
2876 {
2877 hdr->opcode = ISCSI_OP_NOOP_IN;
2878 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2879 hton24(hdr->dlength, cmd->buf_ptr_size);
2880 if (nopout_response)
2881 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2882 hdr->itt = cmd->init_task_tag;
2883 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2884 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2885 conn->stat_sn;
2886 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2887
2888 if (nopout_response)
2889 iscsit_increment_maxcmdsn(cmd, conn->sess);
2890
2891 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2892 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2893
2894 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2895 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2896 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2897 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2898 }
2899 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2900
2901 /*
2902 * Unsolicited NOPIN, either requesting a response or not.
2903 */
2904 static int iscsit_send_unsolicited_nopin(
2905 struct iscsi_cmd *cmd,
2906 struct iscsi_conn *conn,
2907 int want_response)
2908 {
2909 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2910 int tx_size = ISCSI_HDR_LEN, ret;
2911
2912 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2913
2914 if (conn->conn_ops->HeaderDigest) {
2915 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2916
2917 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2918 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2919
2920 tx_size += ISCSI_CRC_LEN;
2921 pr_debug("Attaching CRC32C HeaderDigest to"
2922 " NopIN 0x%08x\n", *header_digest);
2923 }
2924
2925 cmd->iov_misc[0].iov_base = cmd->pdu;
2926 cmd->iov_misc[0].iov_len = tx_size;
2927 cmd->iov_misc_count = 1;
2928 cmd->tx_size = tx_size;
2929
2930 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2931 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2932
2933 ret = iscsit_send_tx_data(cmd, conn, 1);
2934 if (ret < 0) {
2935 iscsit_tx_thread_wait_for_tcp(conn);
2936 return ret;
2937 }
2938
2939 spin_lock_bh(&cmd->istate_lock);
2940 cmd->i_state = want_response ?
2941 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2942 spin_unlock_bh(&cmd->istate_lock);
2943
2944 return 0;
2945 }
2946
2947 static int
2948 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2949 {
2950 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2951 struct kvec *iov;
2952 u32 padding = 0;
2953 int niov = 0, tx_size;
2954
2955 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2956
2957 tx_size = ISCSI_HDR_LEN;
2958 iov = &cmd->iov_misc[0];
2959 iov[niov].iov_base = cmd->pdu;
2960 iov[niov++].iov_len = ISCSI_HDR_LEN;
2961
2962 if (conn->conn_ops->HeaderDigest) {
2963 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2964
2965 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2966 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2967
2968 iov[0].iov_len += ISCSI_CRC_LEN;
2969 tx_size += ISCSI_CRC_LEN;
2970 pr_debug("Attaching CRC32C HeaderDigest"
2971 " to NopIn 0x%08x\n", *header_digest);
2972 }
2973
2974 /*
2975 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2976 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2977 */
2978 if (cmd->buf_ptr_size) {
2979 iov[niov].iov_base = cmd->buf_ptr;
2980 iov[niov++].iov_len = cmd->buf_ptr_size;
2981 tx_size += cmd->buf_ptr_size;
2982
2983 pr_debug("Echoing back %u bytes of ping"
2984 " data.\n", cmd->buf_ptr_size);
2985
2986 padding = ((-cmd->buf_ptr_size) & 3);
2987 if (padding != 0) {
2988 iov[niov].iov_base = &cmd->pad_bytes;
2989 iov[niov++].iov_len = padding;
2990 tx_size += padding;
2991 pr_debug("Attaching %u additional"
2992 " padding bytes.\n", padding);
2993 }
2994 if (conn->conn_ops->DataDigest) {
2995 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2996 cmd->buf_ptr, cmd->buf_ptr_size,
2997 padding, (u8 *)&cmd->pad_bytes,
2998 (u8 *)&cmd->data_crc);
2999
3000 iov[niov].iov_base = &cmd->data_crc;
3001 iov[niov++].iov_len = ISCSI_CRC_LEN;
3002 tx_size += ISCSI_CRC_LEN;
3003 pr_debug("Attached DataDigest for %u"
3004 " bytes of ping data, CRC 0x%08x\n",
3005 cmd->buf_ptr_size, cmd->data_crc);
3006 }
3007 }
3008
3009 cmd->iov_misc_count = niov;
3010 cmd->tx_size = tx_size;
3011
3012 return 0;
3013 }
3014
3015 static int iscsit_send_r2t(
3016 struct iscsi_cmd *cmd,
3017 struct iscsi_conn *conn)
3018 {
3019 int tx_size = 0;
3020 struct iscsi_r2t *r2t;
3021 struct iscsi_r2t_rsp *hdr;
3022 int ret;
3023
3024 r2t = iscsit_get_r2t_from_list(cmd);
3025 if (!r2t)
3026 return -1;
3027
3028 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3029 memset(hdr, 0, ISCSI_HDR_LEN);
3030 hdr->opcode = ISCSI_OP_R2T;
3031 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3032 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3033 (struct scsi_lun *)&hdr->lun);
3034 hdr->itt = cmd->init_task_tag;
3035 spin_lock_bh(&conn->sess->ttt_lock);
3036 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3037 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3038 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3039 spin_unlock_bh(&conn->sess->ttt_lock);
3040 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3041 hdr->statsn = cpu_to_be32(conn->stat_sn);
3042 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3043 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3044 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3045 hdr->data_offset = cpu_to_be32(r2t->offset);
3046 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3047
3048 cmd->iov_misc[0].iov_base = cmd->pdu;
3049 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3050 tx_size += ISCSI_HDR_LEN;
3051
3052 if (conn->conn_ops->HeaderDigest) {
3053 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3054
3055 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3056 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3057
3058 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3059 tx_size += ISCSI_CRC_LEN;
3060 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3061 " PDU 0x%08x\n", *header_digest);
3062 }
3063
3064 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3065 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3066 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3067 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3068 r2t->offset, r2t->xfer_len, conn->cid);
3069
3070 cmd->iov_misc_count = 1;
3071 cmd->tx_size = tx_size;
3072
3073 spin_lock_bh(&cmd->r2t_lock);
3074 r2t->sent_r2t = 1;
3075 spin_unlock_bh(&cmd->r2t_lock);
3076
3077 ret = iscsit_send_tx_data(cmd, conn, 1);
3078 if (ret < 0) {
3079 iscsit_tx_thread_wait_for_tcp(conn);
3080 return ret;
3081 }
3082
3083 spin_lock_bh(&cmd->dataout_timeout_lock);
3084 iscsit_start_dataout_timer(cmd, conn);
3085 spin_unlock_bh(&cmd->dataout_timeout_lock);
3086
3087 return 0;
3088 }
3089
3090 /*
3091 * @recovery: If called from iscsi_task_reassign_complete_write() for
3092 * connection recovery.
3093 */
3094 int iscsit_build_r2ts_for_cmd(
3095 struct iscsi_conn *conn,
3096 struct iscsi_cmd *cmd,
3097 bool recovery)
3098 {
3099 int first_r2t = 1;
3100 u32 offset = 0, xfer_len = 0;
3101
3102 spin_lock_bh(&cmd->r2t_lock);
3103 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3104 spin_unlock_bh(&cmd->r2t_lock);
3105 return 0;
3106 }
3107
3108 if (conn->sess->sess_ops->DataSequenceInOrder &&
3109 !recovery)
3110 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3111
3112 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3113 if (conn->sess->sess_ops->DataSequenceInOrder) {
3114 offset = cmd->r2t_offset;
3115
3116 if (first_r2t && recovery) {
3117 int new_data_end = offset +
3118 conn->sess->sess_ops->MaxBurstLength -
3119 cmd->next_burst_len;
3120
3121 if (new_data_end > cmd->se_cmd.data_length)
3122 xfer_len = cmd->se_cmd.data_length - offset;
3123 else
3124 xfer_len =
3125 conn->sess->sess_ops->MaxBurstLength -
3126 cmd->next_burst_len;
3127 } else {
3128 int new_data_end = offset +
3129 conn->sess->sess_ops->MaxBurstLength;
3130
3131 if (new_data_end > cmd->se_cmd.data_length)
3132 xfer_len = cmd->se_cmd.data_length - offset;
3133 else
3134 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3135 }
3136 cmd->r2t_offset += xfer_len;
3137
3138 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3139 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3140 } else {
3141 struct iscsi_seq *seq;
3142
3143 seq = iscsit_get_seq_holder_for_r2t(cmd);
3144 if (!seq) {
3145 spin_unlock_bh(&cmd->r2t_lock);
3146 return -1;
3147 }
3148
3149 offset = seq->offset;
3150 xfer_len = seq->xfer_len;
3151
3152 if (cmd->seq_send_order == cmd->seq_count)
3153 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3154 }
3155 cmd->outstanding_r2ts++;
3156 first_r2t = 0;
3157
3158 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3159 spin_unlock_bh(&cmd->r2t_lock);
3160 return -1;
3161 }
3162
3163 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3164 break;
3165 }
3166 spin_unlock_bh(&cmd->r2t_lock);
3167
3168 return 0;
3169 }
3170
3171 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3172 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3173 {
3174 if (inc_stat_sn)
3175 cmd->stat_sn = conn->stat_sn++;
3176
3177 spin_lock_bh(&conn->sess->session_stats_lock);
3178 conn->sess->rsp_pdus++;
3179 spin_unlock_bh(&conn->sess->session_stats_lock);
3180
3181 memset(hdr, 0, ISCSI_HDR_LEN);
3182 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3183 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3184 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3185 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3186 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3187 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3188 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3189 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3190 }
3191 hdr->response = cmd->iscsi_response;
3192 hdr->cmd_status = cmd->se_cmd.scsi_status;
3193 hdr->itt = cmd->init_task_tag;
3194 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3195
3196 iscsit_increment_maxcmdsn(cmd, conn->sess);
3197 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3198 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3199
3200 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3201 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3202 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3203 cmd->se_cmd.scsi_status, conn->cid);
3204 }
3205 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3206
3207 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3208 {
3209 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3210 struct kvec *iov;
3211 u32 padding = 0, tx_size = 0;
3212 int iov_count = 0;
3213 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3214
3215 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3216
3217 iov = &cmd->iov_misc[0];
3218 iov[iov_count].iov_base = cmd->pdu;
3219 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3220 tx_size += ISCSI_HDR_LEN;
3221
3222 /*
3223 * Attach SENSE DATA payload to iSCSI Response PDU
3224 */
3225 if (cmd->se_cmd.sense_buffer &&
3226 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3227 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3228 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3229 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3230
3231 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3232 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3233 iov[iov_count].iov_base = cmd->sense_buffer;
3234 iov[iov_count++].iov_len =
3235 (cmd->se_cmd.scsi_sense_length + padding);
3236 tx_size += cmd->se_cmd.scsi_sense_length;
3237
3238 if (padding) {
3239 memset(cmd->sense_buffer +
3240 cmd->se_cmd.scsi_sense_length, 0, padding);
3241 tx_size += padding;
3242 pr_debug("Adding %u bytes of padding to"
3243 " SENSE.\n", padding);
3244 }
3245
3246 if (conn->conn_ops->DataDigest) {
3247 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3248 cmd->sense_buffer,
3249 (cmd->se_cmd.scsi_sense_length + padding),
3250 0, NULL, (u8 *)&cmd->data_crc);
3251
3252 iov[iov_count].iov_base = &cmd->data_crc;
3253 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3254 tx_size += ISCSI_CRC_LEN;
3255
3256 pr_debug("Attaching CRC32 DataDigest for"
3257 " SENSE, %u bytes CRC 0x%08x\n",
3258 (cmd->se_cmd.scsi_sense_length + padding),
3259 cmd->data_crc);
3260 }
3261
3262 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3263 " Response PDU\n",
3264 cmd->se_cmd.scsi_sense_length);
3265 }
3266
3267 if (conn->conn_ops->HeaderDigest) {
3268 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3269
3270 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3271 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3272
3273 iov[0].iov_len += ISCSI_CRC_LEN;
3274 tx_size += ISCSI_CRC_LEN;
3275 pr_debug("Attaching CRC32 HeaderDigest for Response"
3276 " PDU 0x%08x\n", *header_digest);
3277 }
3278
3279 cmd->iov_misc_count = iov_count;
3280 cmd->tx_size = tx_size;
3281
3282 return 0;
3283 }
3284
3285 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3286 {
3287 switch (se_tmr->response) {
3288 case TMR_FUNCTION_COMPLETE:
3289 return ISCSI_TMF_RSP_COMPLETE;
3290 case TMR_TASK_DOES_NOT_EXIST:
3291 return ISCSI_TMF_RSP_NO_TASK;
3292 case TMR_LUN_DOES_NOT_EXIST:
3293 return ISCSI_TMF_RSP_NO_LUN;
3294 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3295 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3296 case TMR_FUNCTION_REJECTED:
3297 default:
3298 return ISCSI_TMF_RSP_REJECTED;
3299 }
3300 }
3301
3302 void
3303 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3304 struct iscsi_tm_rsp *hdr)
3305 {
3306 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3307
3308 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3309 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3310 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3311 hdr->itt = cmd->init_task_tag;
3312 cmd->stat_sn = conn->stat_sn++;
3313 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3314
3315 iscsit_increment_maxcmdsn(cmd, conn->sess);
3316 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3317 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3318
3319 pr_debug("Built Task Management Response ITT: 0x%08x,"
3320 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3321 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3322 }
3323 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3324
3325 static int
3326 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3327 {
3328 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3329 u32 tx_size = 0;
3330
3331 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3332
3333 cmd->iov_misc[0].iov_base = cmd->pdu;
3334 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3335 tx_size += ISCSI_HDR_LEN;
3336
3337 if (conn->conn_ops->HeaderDigest) {
3338 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3339
3340 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3341 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3342
3343 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3344 tx_size += ISCSI_CRC_LEN;
3345 pr_debug("Attaching CRC32 HeaderDigest for Task"
3346 " Mgmt Response PDU 0x%08x\n", *header_digest);
3347 }
3348
3349 cmd->iov_misc_count = 1;
3350 cmd->tx_size = tx_size;
3351
3352 return 0;
3353 }
3354
3355 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3356 {
3357 bool ret = false;
3358
3359 if (np->np_sockaddr.ss_family == AF_INET6) {
3360 const struct sockaddr_in6 sin6 = {
3361 .sin6_addr = IN6ADDR_ANY_INIT };
3362 struct sockaddr_in6 *sock_in6 =
3363 (struct sockaddr_in6 *)&np->np_sockaddr;
3364
3365 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3366 sin6.sin6_addr.s6_addr, 16))
3367 ret = true;
3368 } else {
3369 struct sockaddr_in * sock_in =
3370 (struct sockaddr_in *)&np->np_sockaddr;
3371
3372 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3373 ret = true;
3374 }
3375
3376 return ret;
3377 }
3378
3379 #define SENDTARGETS_BUF_LIMIT 32768U
3380
3381 static int
3382 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3383 enum iscsit_transport_type network_transport)
3384 {
3385 char *payload = NULL;
3386 struct iscsi_conn *conn = cmd->conn;
3387 struct iscsi_portal_group *tpg;
3388 struct iscsi_tiqn *tiqn;
3389 struct iscsi_tpg_np *tpg_np;
3390 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3391 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3392 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3393
3394 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3395 SENDTARGETS_BUF_LIMIT);
3396
3397 payload = kzalloc(buffer_len, GFP_KERNEL);
3398 if (!payload) {
3399 pr_err("Unable to allocate memory for sendtargets"
3400 " response.\n");
3401 return -ENOMEM;
3402 }
3403 /*
3404 * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
3405 * explicit case..
3406 */
3407 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
3408 text_ptr = strchr(text_in, '=');
3409 if (!text_ptr) {
3410 pr_err("Unable to locate '=' string in text_in:"
3411 " %s\n", text_in);
3412 kfree(payload);
3413 return -EINVAL;
3414 }
3415 /*
3416 * Skip over '=' character..
3417 */
3418 text_ptr += 1;
3419 }
3420
3421 spin_lock(&tiqn_lock);
3422 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3423 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
3424 strcmp(tiqn->tiqn, text_ptr)) {
3425 continue;
3426 }
3427
3428 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3429 len += 1;
3430
3431 if ((len + payload_len) > buffer_len) {
3432 end_of_buf = 1;
3433 goto eob;
3434 }
3435 memcpy(payload + payload_len, buf, len);
3436 payload_len += len;
3437
3438 spin_lock(&tiqn->tiqn_tpg_lock);
3439 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3440
3441 spin_lock(&tpg->tpg_state_lock);
3442 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3443 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3444 spin_unlock(&tpg->tpg_state_lock);
3445 continue;
3446 }
3447 spin_unlock(&tpg->tpg_state_lock);
3448
3449 spin_lock(&tpg->tpg_np_lock);
3450 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3451 tpg_np_list) {
3452 struct iscsi_np *np = tpg_np->tpg_np;
3453 bool inaddr_any = iscsit_check_inaddr_any(np);
3454
3455 if (np->np_network_transport != network_transport)
3456 continue;
3457
3458 len = sprintf(buf, "TargetAddress="
3459 "%s:%hu,%hu",
3460 (inaddr_any == false) ?
3461 np->np_ip : conn->local_ip,
3462 (inaddr_any == false) ?
3463 np->np_port : conn->local_port,
3464 tpg->tpgt);
3465 len += 1;
3466
3467 if ((len + payload_len) > buffer_len) {
3468 spin_unlock(&tpg->tpg_np_lock);
3469 spin_unlock(&tiqn->tiqn_tpg_lock);
3470 end_of_buf = 1;
3471 goto eob;
3472 }
3473 memcpy(payload + payload_len, buf, len);
3474 payload_len += len;
3475 }
3476 spin_unlock(&tpg->tpg_np_lock);
3477 }
3478 spin_unlock(&tiqn->tiqn_tpg_lock);
3479 eob:
3480 if (end_of_buf)
3481 break;
3482
3483 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
3484 break;
3485 }
3486 spin_unlock(&tiqn_lock);
3487
3488 cmd->buf_ptr = payload;
3489
3490 return payload_len;
3491 }
3492
3493 int
3494 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3495 struct iscsi_text_rsp *hdr,
3496 enum iscsit_transport_type network_transport)
3497 {
3498 int text_length, padding;
3499
3500 text_length = iscsit_build_sendtargets_response(cmd, network_transport);
3501 if (text_length < 0)
3502 return text_length;
3503
3504 hdr->opcode = ISCSI_OP_TEXT_RSP;
3505 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3506 padding = ((-text_length) & 3);
3507 hton24(hdr->dlength, text_length);
3508 hdr->itt = cmd->init_task_tag;
3509 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3510 cmd->stat_sn = conn->stat_sn++;
3511 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3512
3513 iscsit_increment_maxcmdsn(cmd, conn->sess);
3514 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3515 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3516
3517 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3518 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3519 text_length, conn->cid);
3520
3521 return text_length + padding;
3522 }
3523 EXPORT_SYMBOL(iscsit_build_text_rsp);
3524
3525 /*
3526 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3527 * MaxRecvDataSegmentLength.
3528 */
3529 static int iscsit_send_text_rsp(
3530 struct iscsi_cmd *cmd,
3531 struct iscsi_conn *conn)
3532 {
3533 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3534 struct kvec *iov;
3535 u32 tx_size = 0;
3536 int text_length, iov_count = 0, rc;
3537
3538 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP);
3539 if (rc < 0)
3540 return rc;
3541
3542 text_length = rc;
3543 iov = &cmd->iov_misc[0];
3544 iov[iov_count].iov_base = cmd->pdu;
3545 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3546 iov[iov_count].iov_base = cmd->buf_ptr;
3547 iov[iov_count++].iov_len = text_length;
3548
3549 tx_size += (ISCSI_HDR_LEN + text_length);
3550
3551 if (conn->conn_ops->HeaderDigest) {
3552 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3553
3554 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3555 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3556
3557 iov[0].iov_len += ISCSI_CRC_LEN;
3558 tx_size += ISCSI_CRC_LEN;
3559 pr_debug("Attaching CRC32 HeaderDigest for"
3560 " Text Response PDU 0x%08x\n", *header_digest);
3561 }
3562
3563 if (conn->conn_ops->DataDigest) {
3564 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3565 cmd->buf_ptr, text_length,
3566 0, NULL, (u8 *)&cmd->data_crc);
3567
3568 iov[iov_count].iov_base = &cmd->data_crc;
3569 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3570 tx_size += ISCSI_CRC_LEN;
3571
3572 pr_debug("Attaching DataDigest for %u bytes of text"
3573 " data, CRC 0x%08x\n", text_length,
3574 cmd->data_crc);
3575 }
3576
3577 cmd->iov_misc_count = iov_count;
3578 cmd->tx_size = tx_size;
3579
3580 return 0;
3581 }
3582
3583 void
3584 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3585 struct iscsi_reject *hdr)
3586 {
3587 hdr->opcode = ISCSI_OP_REJECT;
3588 hdr->reason = cmd->reject_reason;
3589 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3590 hton24(hdr->dlength, ISCSI_HDR_LEN);
3591 hdr->ffffffff = cpu_to_be32(0xffffffff);
3592 cmd->stat_sn = conn->stat_sn++;
3593 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3594 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3595 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3596
3597 }
3598 EXPORT_SYMBOL(iscsit_build_reject);
3599
3600 static int iscsit_send_reject(
3601 struct iscsi_cmd *cmd,
3602 struct iscsi_conn *conn)
3603 {
3604 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3605 struct kvec *iov;
3606 u32 iov_count = 0, tx_size;
3607
3608 iscsit_build_reject(cmd, conn, hdr);
3609
3610 iov = &cmd->iov_misc[0];
3611 iov[iov_count].iov_base = cmd->pdu;
3612 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3613 iov[iov_count].iov_base = cmd->buf_ptr;
3614 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3615
3616 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3617
3618 if (conn->conn_ops->HeaderDigest) {
3619 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3620
3621 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3622 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3623
3624 iov[0].iov_len += ISCSI_CRC_LEN;
3625 tx_size += ISCSI_CRC_LEN;
3626 pr_debug("Attaching CRC32 HeaderDigest for"
3627 " REJECT PDU 0x%08x\n", *header_digest);
3628 }
3629
3630 if (conn->conn_ops->DataDigest) {
3631 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3632 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3633
3634 iov[iov_count].iov_base = &cmd->data_crc;
3635 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3636 tx_size += ISCSI_CRC_LEN;
3637 pr_debug("Attaching CRC32 DataDigest for REJECT"
3638 " PDU 0x%08x\n", cmd->data_crc);
3639 }
3640
3641 cmd->iov_misc_count = iov_count;
3642 cmd->tx_size = tx_size;
3643
3644 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3645 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3646
3647 return 0;
3648 }
3649
3650 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3651 {
3652 struct iscsi_thread_set *ts = conn->thread_set;
3653 int ord, cpu;
3654 /*
3655 * thread_id is assigned from iscsit_global->ts_bitmap from
3656 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3657 *
3658 * Here we use thread_id to determine which CPU that this
3659 * iSCSI connection's iscsi_thread_set will be scheduled to
3660 * execute upon.
3661 */
3662 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3663 for_each_online_cpu(cpu) {
3664 if (ord-- == 0) {
3665 cpumask_set_cpu(cpu, conn->conn_cpumask);
3666 return;
3667 }
3668 }
3669 /*
3670 * This should never be reached..
3671 */
3672 dump_stack();
3673 cpumask_setall(conn->conn_cpumask);
3674 }
3675
3676 static inline void iscsit_thread_check_cpumask(
3677 struct iscsi_conn *conn,
3678 struct task_struct *p,
3679 int mode)
3680 {
3681 char buf[128];
3682 /*
3683 * mode == 1 signals iscsi_target_tx_thread() usage.
3684 * mode == 0 signals iscsi_target_rx_thread() usage.
3685 */
3686 if (mode == 1) {
3687 if (!conn->conn_tx_reset_cpumask)
3688 return;
3689 conn->conn_tx_reset_cpumask = 0;
3690 } else {
3691 if (!conn->conn_rx_reset_cpumask)
3692 return;
3693 conn->conn_rx_reset_cpumask = 0;
3694 }
3695 /*
3696 * Update the CPU mask for this single kthread so that
3697 * both TX and RX kthreads are scheduled to run on the
3698 * same CPU.
3699 */
3700 memset(buf, 0, 128);
3701 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3702 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3703 }
3704
3705 static int
3706 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3707 {
3708 int ret;
3709
3710 switch (state) {
3711 case ISTATE_SEND_R2T:
3712 ret = iscsit_send_r2t(cmd, conn);
3713 if (ret < 0)
3714 goto err;
3715 break;
3716 case ISTATE_REMOVE:
3717 spin_lock_bh(&conn->cmd_lock);
3718 list_del_init(&cmd->i_conn_node);
3719 spin_unlock_bh(&conn->cmd_lock);
3720
3721 iscsit_free_cmd(cmd, false);
3722 break;
3723 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3724 iscsit_mod_nopin_response_timer(conn);
3725 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3726 if (ret < 0)
3727 goto err;
3728 break;
3729 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3730 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3731 if (ret < 0)
3732 goto err;
3733 break;
3734 default:
3735 pr_err("Unknown Opcode: 0x%02x ITT:"
3736 " 0x%08x, i_state: %d on CID: %hu\n",
3737 cmd->iscsi_opcode, cmd->init_task_tag, state,
3738 conn->cid);
3739 goto err;
3740 }
3741
3742 return 0;
3743
3744 err:
3745 return -1;
3746 }
3747
3748 static int
3749 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3750 {
3751 struct iscsit_transport *t = conn->conn_transport;
3752 struct iscsi_queue_req *qr;
3753 struct iscsi_cmd *cmd;
3754 u8 state;
3755 int ret;
3756
3757 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3758 atomic_set(&conn->check_immediate_queue, 0);
3759 cmd = qr->cmd;
3760 state = qr->state;
3761 kmem_cache_free(lio_qr_cache, qr);
3762
3763 ret = t->iscsit_immediate_queue(conn, cmd, state);
3764 if (ret < 0)
3765 return ret;
3766 }
3767
3768 return 0;
3769 }
3770
3771 static int
3772 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3773 {
3774 int ret;
3775
3776 check_rsp_state:
3777 switch (state) {
3778 case ISTATE_SEND_DATAIN:
3779 ret = iscsit_send_datain(cmd, conn);
3780 if (ret < 0)
3781 goto err;
3782 else if (!ret)
3783 /* more drs */
3784 goto check_rsp_state;
3785 else if (ret == 1) {
3786 /* all done */
3787 spin_lock_bh(&cmd->istate_lock);
3788 cmd->i_state = ISTATE_SENT_STATUS;
3789 spin_unlock_bh(&cmd->istate_lock);
3790
3791 if (atomic_read(&conn->check_immediate_queue))
3792 return 1;
3793
3794 return 0;
3795 } else if (ret == 2) {
3796 /* Still must send status,
3797 SCF_TRANSPORT_TASK_SENSE was set */
3798 spin_lock_bh(&cmd->istate_lock);
3799 cmd->i_state = ISTATE_SEND_STATUS;
3800 spin_unlock_bh(&cmd->istate_lock);
3801 state = ISTATE_SEND_STATUS;
3802 goto check_rsp_state;
3803 }
3804
3805 break;
3806 case ISTATE_SEND_STATUS:
3807 case ISTATE_SEND_STATUS_RECOVERY:
3808 ret = iscsit_send_response(cmd, conn);
3809 break;
3810 case ISTATE_SEND_LOGOUTRSP:
3811 ret = iscsit_send_logout(cmd, conn);
3812 break;
3813 case ISTATE_SEND_ASYNCMSG:
3814 ret = iscsit_send_conn_drop_async_message(
3815 cmd, conn);
3816 break;
3817 case ISTATE_SEND_NOPIN:
3818 ret = iscsit_send_nopin(cmd, conn);
3819 break;
3820 case ISTATE_SEND_REJECT:
3821 ret = iscsit_send_reject(cmd, conn);
3822 break;
3823 case ISTATE_SEND_TASKMGTRSP:
3824 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3825 if (ret != 0)
3826 break;
3827 ret = iscsit_tmr_post_handler(cmd, conn);
3828 if (ret != 0)
3829 iscsit_fall_back_to_erl0(conn->sess);
3830 break;
3831 case ISTATE_SEND_TEXTRSP:
3832 ret = iscsit_send_text_rsp(cmd, conn);
3833 break;
3834 default:
3835 pr_err("Unknown Opcode: 0x%02x ITT:"
3836 " 0x%08x, i_state: %d on CID: %hu\n",
3837 cmd->iscsi_opcode, cmd->init_task_tag,
3838 state, conn->cid);
3839 goto err;
3840 }
3841 if (ret < 0)
3842 goto err;
3843
3844 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3845 iscsit_tx_thread_wait_for_tcp(conn);
3846 iscsit_unmap_iovec(cmd);
3847 goto err;
3848 }
3849 iscsit_unmap_iovec(cmd);
3850
3851 switch (state) {
3852 case ISTATE_SEND_LOGOUTRSP:
3853 if (!iscsit_logout_post_handler(cmd, conn))
3854 goto restart;
3855 /* fall through */
3856 case ISTATE_SEND_STATUS:
3857 case ISTATE_SEND_ASYNCMSG:
3858 case ISTATE_SEND_NOPIN:
3859 case ISTATE_SEND_STATUS_RECOVERY:
3860 case ISTATE_SEND_TEXTRSP:
3861 case ISTATE_SEND_TASKMGTRSP:
3862 case ISTATE_SEND_REJECT:
3863 spin_lock_bh(&cmd->istate_lock);
3864 cmd->i_state = ISTATE_SENT_STATUS;
3865 spin_unlock_bh(&cmd->istate_lock);
3866 break;
3867 default:
3868 pr_err("Unknown Opcode: 0x%02x ITT:"
3869 " 0x%08x, i_state: %d on CID: %hu\n",
3870 cmd->iscsi_opcode, cmd->init_task_tag,
3871 cmd->i_state, conn->cid);
3872 goto err;
3873 }
3874
3875 if (atomic_read(&conn->check_immediate_queue))
3876 return 1;
3877
3878 return 0;
3879
3880 err:
3881 return -1;
3882 restart:
3883 return -EAGAIN;
3884 }
3885
3886 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3887 {
3888 struct iscsit_transport *t = conn->conn_transport;
3889 struct iscsi_queue_req *qr;
3890 struct iscsi_cmd *cmd;
3891 u8 state;
3892 int ret;
3893
3894 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3895 cmd = qr->cmd;
3896 state = qr->state;
3897 kmem_cache_free(lio_qr_cache, qr);
3898
3899 ret = t->iscsit_response_queue(conn, cmd, state);
3900 if (ret == 1 || ret < 0)
3901 return ret;
3902 }
3903
3904 return 0;
3905 }
3906
3907 int iscsi_target_tx_thread(void *arg)
3908 {
3909 int ret = 0;
3910 struct iscsi_conn *conn;
3911 struct iscsi_thread_set *ts = arg;
3912 /*
3913 * Allow ourselves to be interrupted by SIGINT so that a
3914 * connection recovery / failure event can be triggered externally.
3915 */
3916 allow_signal(SIGINT);
3917
3918 restart:
3919 conn = iscsi_tx_thread_pre_handler(ts);
3920 if (!conn)
3921 goto out;
3922
3923 ret = 0;
3924
3925 while (!kthread_should_stop()) {
3926 /*
3927 * Ensure that both TX and RX per connection kthreads
3928 * are scheduled to run on the same CPU.
3929 */
3930 iscsit_thread_check_cpumask(conn, current, 1);
3931
3932 wait_event_interruptible(conn->queues_wq,
3933 !iscsit_conn_all_queues_empty(conn) ||
3934 ts->status == ISCSI_THREAD_SET_RESET);
3935
3936 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3937 signal_pending(current))
3938 goto transport_err;
3939
3940 get_immediate:
3941 ret = iscsit_handle_immediate_queue(conn);
3942 if (ret < 0)
3943 goto transport_err;
3944
3945 ret = iscsit_handle_response_queue(conn);
3946 if (ret == 1)
3947 goto get_immediate;
3948 else if (ret == -EAGAIN)
3949 goto restart;
3950 else if (ret < 0)
3951 goto transport_err;
3952 }
3953
3954 transport_err:
3955 iscsit_take_action_for_connection_exit(conn);
3956 goto restart;
3957 out:
3958 return 0;
3959 }
3960
3961 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3962 {
3963 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3964 struct iscsi_cmd *cmd;
3965 int ret = 0;
3966
3967 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3968 case ISCSI_OP_SCSI_CMD:
3969 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3970 if (!cmd)
3971 goto reject;
3972
3973 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3974 break;
3975 case ISCSI_OP_SCSI_DATA_OUT:
3976 ret = iscsit_handle_data_out(conn, buf);
3977 break;
3978 case ISCSI_OP_NOOP_OUT:
3979 cmd = NULL;
3980 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3981 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3982 if (!cmd)
3983 goto reject;
3984 }
3985 ret = iscsit_handle_nop_out(conn, cmd, buf);
3986 break;
3987 case ISCSI_OP_SCSI_TMFUNC:
3988 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3989 if (!cmd)
3990 goto reject;
3991
3992 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3993 break;
3994 case ISCSI_OP_TEXT:
3995 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3996 if (!cmd)
3997 goto reject;
3998
3999 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4000 break;
4001 case ISCSI_OP_LOGOUT:
4002 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
4003 if (!cmd)
4004 goto reject;
4005
4006 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4007 if (ret > 0)
4008 wait_for_completion_timeout(&conn->conn_logout_comp,
4009 SECONDS_FOR_LOGOUT_COMP * HZ);
4010 break;
4011 case ISCSI_OP_SNACK:
4012 ret = iscsit_handle_snack(conn, buf);
4013 break;
4014 default:
4015 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4016 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4017 pr_err("Cannot recover from unknown"
4018 " opcode while ERL=0, closing iSCSI connection.\n");
4019 return -1;
4020 }
4021 if (!conn->conn_ops->OFMarker) {
4022 pr_err("Unable to recover from unknown"
4023 " opcode while OFMarker=No, closing iSCSI"
4024 " connection.\n");
4025 return -1;
4026 }
4027 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4028 pr_err("Unable to recover from unknown"
4029 " opcode, closing iSCSI connection.\n");
4030 return -1;
4031 }
4032 break;
4033 }
4034
4035 return ret;
4036 reject:
4037 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4038 }
4039
4040 int iscsi_target_rx_thread(void *arg)
4041 {
4042 int ret;
4043 u8 buffer[ISCSI_HDR_LEN], opcode;
4044 u32 checksum = 0, digest = 0;
4045 struct iscsi_conn *conn = NULL;
4046 struct iscsi_thread_set *ts = arg;
4047 struct kvec iov;
4048 /*
4049 * Allow ourselves to be interrupted by SIGINT so that a
4050 * connection recovery / failure event can be triggered externally.
4051 */
4052 allow_signal(SIGINT);
4053
4054 restart:
4055 conn = iscsi_rx_thread_pre_handler(ts);
4056 if (!conn)
4057 goto out;
4058
4059 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4060 struct completion comp;
4061 int rc;
4062
4063 init_completion(&comp);
4064 rc = wait_for_completion_interruptible(&comp);
4065 if (rc < 0)
4066 goto transport_err;
4067
4068 goto out;
4069 }
4070
4071 while (!kthread_should_stop()) {
4072 /*
4073 * Ensure that both TX and RX per connection kthreads
4074 * are scheduled to run on the same CPU.
4075 */
4076 iscsit_thread_check_cpumask(conn, current, 0);
4077
4078 memset(buffer, 0, ISCSI_HDR_LEN);
4079 memset(&iov, 0, sizeof(struct kvec));
4080
4081 iov.iov_base = buffer;
4082 iov.iov_len = ISCSI_HDR_LEN;
4083
4084 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4085 if (ret != ISCSI_HDR_LEN) {
4086 iscsit_rx_thread_wait_for_tcp(conn);
4087 goto transport_err;
4088 }
4089
4090 if (conn->conn_ops->HeaderDigest) {
4091 iov.iov_base = &digest;
4092 iov.iov_len = ISCSI_CRC_LEN;
4093
4094 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4095 if (ret != ISCSI_CRC_LEN) {
4096 iscsit_rx_thread_wait_for_tcp(conn);
4097 goto transport_err;
4098 }
4099
4100 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4101 buffer, ISCSI_HDR_LEN,
4102 0, NULL, (u8 *)&checksum);
4103
4104 if (digest != checksum) {
4105 pr_err("HeaderDigest CRC32C failed,"
4106 " received 0x%08x, computed 0x%08x\n",
4107 digest, checksum);
4108 /*
4109 * Set the PDU to 0xff so it will intentionally
4110 * hit default in the switch below.
4111 */
4112 memset(buffer, 0xff, ISCSI_HDR_LEN);
4113 spin_lock_bh(&conn->sess->session_stats_lock);
4114 conn->sess->conn_digest_errors++;
4115 spin_unlock_bh(&conn->sess->session_stats_lock);
4116 } else {
4117 pr_debug("Got HeaderDigest CRC32C"
4118 " 0x%08x\n", checksum);
4119 }
4120 }
4121
4122 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4123 goto transport_err;
4124
4125 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4126
4127 if (conn->sess->sess_ops->SessionType &&
4128 ((!(opcode & ISCSI_OP_TEXT)) ||
4129 (!(opcode & ISCSI_OP_LOGOUT)))) {
4130 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4131 " while in Discovery Session, rejecting.\n", opcode);
4132 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4133 buffer);
4134 goto transport_err;
4135 }
4136
4137 ret = iscsi_target_rx_opcode(conn, buffer);
4138 if (ret < 0)
4139 goto transport_err;
4140 }
4141
4142 transport_err:
4143 if (!signal_pending(current))
4144 atomic_set(&conn->transport_failed, 1);
4145 iscsit_take_action_for_connection_exit(conn);
4146 goto restart;
4147 out:
4148 return 0;
4149 }
4150
4151 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4152 {
4153 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4154 struct iscsi_session *sess = conn->sess;
4155 /*
4156 * We expect this function to only ever be called from either RX or TX
4157 * thread context via iscsit_close_connection() once the other context
4158 * has been reset -> returned sleeping pre-handler state.
4159 */
4160 spin_lock_bh(&conn->cmd_lock);
4161 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4162
4163 list_del_init(&cmd->i_conn_node);
4164 spin_unlock_bh(&conn->cmd_lock);
4165
4166 iscsit_increment_maxcmdsn(cmd, sess);
4167
4168 iscsit_free_cmd(cmd, true);
4169
4170 spin_lock_bh(&conn->cmd_lock);
4171 }
4172 spin_unlock_bh(&conn->cmd_lock);
4173 }
4174
4175 static void iscsit_stop_timers_for_cmds(
4176 struct iscsi_conn *conn)
4177 {
4178 struct iscsi_cmd *cmd;
4179
4180 spin_lock_bh(&conn->cmd_lock);
4181 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4182 if (cmd->data_direction == DMA_TO_DEVICE)
4183 iscsit_stop_dataout_timer(cmd);
4184 }
4185 spin_unlock_bh(&conn->cmd_lock);
4186 }
4187
4188 int iscsit_close_connection(
4189 struct iscsi_conn *conn)
4190 {
4191 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4192 struct iscsi_session *sess = conn->sess;
4193
4194 pr_debug("Closing iSCSI connection CID %hu on SID:"
4195 " %u\n", conn->cid, sess->sid);
4196 /*
4197 * Always up conn_logout_comp just in case the RX Thread is sleeping
4198 * and the logout response never got sent because the connection
4199 * failed.
4200 */
4201 complete(&conn->conn_logout_comp);
4202
4203 iscsi_release_thread_set(conn);
4204
4205 iscsit_stop_timers_for_cmds(conn);
4206 iscsit_stop_nopin_response_timer(conn);
4207 iscsit_stop_nopin_timer(conn);
4208
4209 if (conn->conn_transport->iscsit_wait_conn)
4210 conn->conn_transport->iscsit_wait_conn(conn);
4211
4212 /*
4213 * During Connection recovery drop unacknowledged out of order
4214 * commands for this connection, and prepare the other commands
4215 * for realligence.
4216 *
4217 * During normal operation clear the out of order commands (but
4218 * do not free the struct iscsi_ooo_cmdsn's) and release all
4219 * struct iscsi_cmds.
4220 */
4221 if (atomic_read(&conn->connection_recovery)) {
4222 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4223 iscsit_prepare_cmds_for_realligance(conn);
4224 } else {
4225 iscsit_clear_ooo_cmdsns_for_conn(conn);
4226 iscsit_release_commands_from_conn(conn);
4227 }
4228 iscsit_free_queue_reqs_for_conn(conn);
4229
4230 /*
4231 * Handle decrementing session or connection usage count if
4232 * a logout response was not able to be sent because the
4233 * connection failed. Fall back to Session Recovery here.
4234 */
4235 if (atomic_read(&conn->conn_logout_remove)) {
4236 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4237 iscsit_dec_conn_usage_count(conn);
4238 iscsit_dec_session_usage_count(sess);
4239 }
4240 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4241 iscsit_dec_conn_usage_count(conn);
4242
4243 atomic_set(&conn->conn_logout_remove, 0);
4244 atomic_set(&sess->session_reinstatement, 0);
4245 atomic_set(&sess->session_fall_back_to_erl0, 1);
4246 }
4247
4248 spin_lock_bh(&sess->conn_lock);
4249 list_del(&conn->conn_list);
4250
4251 /*
4252 * Attempt to let the Initiator know this connection failed by
4253 * sending an Connection Dropped Async Message on another
4254 * active connection.
4255 */
4256 if (atomic_read(&conn->connection_recovery))
4257 iscsit_build_conn_drop_async_message(conn);
4258
4259 spin_unlock_bh(&sess->conn_lock);
4260
4261 /*
4262 * If connection reinstatement is being performed on this connection,
4263 * up the connection reinstatement semaphore that is being blocked on
4264 * in iscsit_cause_connection_reinstatement().
4265 */
4266 spin_lock_bh(&conn->state_lock);
4267 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4268 spin_unlock_bh(&conn->state_lock);
4269 complete(&conn->conn_wait_comp);
4270 wait_for_completion(&conn->conn_post_wait_comp);
4271 spin_lock_bh(&conn->state_lock);
4272 }
4273
4274 /*
4275 * If connection reinstatement is being performed on this connection
4276 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4277 * connection wait rcfr semaphore that is being blocked on
4278 * an iscsit_connection_reinstatement_rcfr().
4279 */
4280 if (atomic_read(&conn->connection_wait_rcfr)) {
4281 spin_unlock_bh(&conn->state_lock);
4282 complete(&conn->conn_wait_rcfr_comp);
4283 wait_for_completion(&conn->conn_post_wait_comp);
4284 spin_lock_bh(&conn->state_lock);
4285 }
4286 atomic_set(&conn->connection_reinstatement, 1);
4287 spin_unlock_bh(&conn->state_lock);
4288
4289 /*
4290 * If any other processes are accessing this connection pointer we
4291 * must wait until they have completed.
4292 */
4293 iscsit_check_conn_usage_count(conn);
4294
4295 if (conn->conn_rx_hash.tfm)
4296 crypto_free_hash(conn->conn_rx_hash.tfm);
4297 if (conn->conn_tx_hash.tfm)
4298 crypto_free_hash(conn->conn_tx_hash.tfm);
4299
4300 if (conn->conn_cpumask)
4301 free_cpumask_var(conn->conn_cpumask);
4302
4303 kfree(conn->conn_ops);
4304 conn->conn_ops = NULL;
4305
4306 if (conn->sock)
4307 sock_release(conn->sock);
4308
4309 if (conn->conn_transport->iscsit_free_conn)
4310 conn->conn_transport->iscsit_free_conn(conn);
4311
4312 iscsit_put_transport(conn->conn_transport);
4313
4314 conn->thread_set = NULL;
4315
4316 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4317 conn->conn_state = TARG_CONN_STATE_FREE;
4318 kfree(conn);
4319
4320 spin_lock_bh(&sess->conn_lock);
4321 atomic_dec(&sess->nconn);
4322 pr_debug("Decremented iSCSI connection count to %hu from node:"
4323 " %s\n", atomic_read(&sess->nconn),
4324 sess->sess_ops->InitiatorName);
4325 /*
4326 * Make sure that if one connection fails in an non ERL=2 iSCSI
4327 * Session that they all fail.
4328 */
4329 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4330 !atomic_read(&sess->session_logout))
4331 atomic_set(&sess->session_fall_back_to_erl0, 1);
4332
4333 /*
4334 * If this was not the last connection in the session, and we are
4335 * performing session reinstatement or falling back to ERL=0, call
4336 * iscsit_stop_session() without sleeping to shutdown the other
4337 * active connections.
4338 */
4339 if (atomic_read(&sess->nconn)) {
4340 if (!atomic_read(&sess->session_reinstatement) &&
4341 !atomic_read(&sess->session_fall_back_to_erl0)) {
4342 spin_unlock_bh(&sess->conn_lock);
4343 return 0;
4344 }
4345 if (!atomic_read(&sess->session_stop_active)) {
4346 atomic_set(&sess->session_stop_active, 1);
4347 spin_unlock_bh(&sess->conn_lock);
4348 iscsit_stop_session(sess, 0, 0);
4349 return 0;
4350 }
4351 spin_unlock_bh(&sess->conn_lock);
4352 return 0;
4353 }
4354
4355 /*
4356 * If this was the last connection in the session and one of the
4357 * following is occurring:
4358 *
4359 * Session Reinstatement is not being performed, and are falling back
4360 * to ERL=0 call iscsit_close_session().
4361 *
4362 * Session Logout was requested. iscsit_close_session() will be called
4363 * elsewhere.
4364 *
4365 * Session Continuation is not being performed, start the Time2Retain
4366 * handler and check if sleep_on_sess_wait_sem is active.
4367 */
4368 if (!atomic_read(&sess->session_reinstatement) &&
4369 atomic_read(&sess->session_fall_back_to_erl0)) {
4370 spin_unlock_bh(&sess->conn_lock);
4371 target_put_session(sess->se_sess);
4372
4373 return 0;
4374 } else if (atomic_read(&sess->session_logout)) {
4375 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4376 sess->session_state = TARG_SESS_STATE_FREE;
4377 spin_unlock_bh(&sess->conn_lock);
4378
4379 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4380 complete(&sess->session_wait_comp);
4381
4382 return 0;
4383 } else {
4384 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4385 sess->session_state = TARG_SESS_STATE_FAILED;
4386
4387 if (!atomic_read(&sess->session_continuation)) {
4388 spin_unlock_bh(&sess->conn_lock);
4389 iscsit_start_time2retain_handler(sess);
4390 } else
4391 spin_unlock_bh(&sess->conn_lock);
4392
4393 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4394 complete(&sess->session_wait_comp);
4395
4396 return 0;
4397 }
4398 spin_unlock_bh(&sess->conn_lock);
4399
4400 return 0;
4401 }
4402
4403 int iscsit_close_session(struct iscsi_session *sess)
4404 {
4405 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4406 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4407
4408 if (atomic_read(&sess->nconn)) {
4409 pr_err("%d connection(s) still exist for iSCSI session"
4410 " to %s\n", atomic_read(&sess->nconn),
4411 sess->sess_ops->InitiatorName);
4412 BUG();
4413 }
4414
4415 spin_lock_bh(&se_tpg->session_lock);
4416 atomic_set(&sess->session_logout, 1);
4417 atomic_set(&sess->session_reinstatement, 1);
4418 iscsit_stop_time2retain_timer(sess);
4419 spin_unlock_bh(&se_tpg->session_lock);
4420
4421 /*
4422 * transport_deregister_session_configfs() will clear the
4423 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4424 * can be setting it again with __transport_register_session() in
4425 * iscsi_post_login_handler() again after the iscsit_stop_session()
4426 * completes in iscsi_np context.
4427 */
4428 transport_deregister_session_configfs(sess->se_sess);
4429
4430 /*
4431 * If any other processes are accessing this session pointer we must
4432 * wait until they have completed. If we are in an interrupt (the
4433 * time2retain handler) and contain and active session usage count we
4434 * restart the timer and exit.
4435 */
4436 if (!in_interrupt()) {
4437 if (iscsit_check_session_usage_count(sess) == 1)
4438 iscsit_stop_session(sess, 1, 1);
4439 } else {
4440 if (iscsit_check_session_usage_count(sess) == 2) {
4441 atomic_set(&sess->session_logout, 0);
4442 iscsit_start_time2retain_handler(sess);
4443 return 0;
4444 }
4445 }
4446
4447 transport_deregister_session(sess->se_sess);
4448
4449 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4450 iscsit_free_connection_recovery_entires(sess);
4451
4452 iscsit_free_all_ooo_cmdsns(sess);
4453
4454 spin_lock_bh(&se_tpg->session_lock);
4455 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4456 sess->session_state = TARG_SESS_STATE_FREE;
4457 pr_debug("Released iSCSI session from node: %s\n",
4458 sess->sess_ops->InitiatorName);
4459 tpg->nsessions--;
4460 if (tpg->tpg_tiqn)
4461 tpg->tpg_tiqn->tiqn_nsessions--;
4462
4463 pr_debug("Decremented number of active iSCSI Sessions on"
4464 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4465
4466 spin_lock(&sess_idr_lock);
4467 idr_remove(&sess_idr, sess->session_index);
4468 spin_unlock(&sess_idr_lock);
4469
4470 kfree(sess->sess_ops);
4471 sess->sess_ops = NULL;
4472 spin_unlock_bh(&se_tpg->session_lock);
4473
4474 kfree(sess);
4475 return 0;
4476 }
4477
4478 static void iscsit_logout_post_handler_closesession(
4479 struct iscsi_conn *conn)
4480 {
4481 struct iscsi_session *sess = conn->sess;
4482
4483 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4484 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4485
4486 atomic_set(&conn->conn_logout_remove, 0);
4487 complete(&conn->conn_logout_comp);
4488
4489 iscsit_dec_conn_usage_count(conn);
4490 iscsit_stop_session(sess, 1, 1);
4491 iscsit_dec_session_usage_count(sess);
4492 target_put_session(sess->se_sess);
4493 }
4494
4495 static void iscsit_logout_post_handler_samecid(
4496 struct iscsi_conn *conn)
4497 {
4498 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4499 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4500
4501 atomic_set(&conn->conn_logout_remove, 0);
4502 complete(&conn->conn_logout_comp);
4503
4504 iscsit_cause_connection_reinstatement(conn, 1);
4505 iscsit_dec_conn_usage_count(conn);
4506 }
4507
4508 static void iscsit_logout_post_handler_diffcid(
4509 struct iscsi_conn *conn,
4510 u16 cid)
4511 {
4512 struct iscsi_conn *l_conn;
4513 struct iscsi_session *sess = conn->sess;
4514
4515 if (!sess)
4516 return;
4517
4518 spin_lock_bh(&sess->conn_lock);
4519 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4520 if (l_conn->cid == cid) {
4521 iscsit_inc_conn_usage_count(l_conn);
4522 break;
4523 }
4524 }
4525 spin_unlock_bh(&sess->conn_lock);
4526
4527 if (!l_conn)
4528 return;
4529
4530 if (l_conn->sock)
4531 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4532
4533 spin_lock_bh(&l_conn->state_lock);
4534 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4535 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4536 spin_unlock_bh(&l_conn->state_lock);
4537
4538 iscsit_cause_connection_reinstatement(l_conn, 1);
4539 iscsit_dec_conn_usage_count(l_conn);
4540 }
4541
4542 /*
4543 * Return of 0 causes the TX thread to restart.
4544 */
4545 int iscsit_logout_post_handler(
4546 struct iscsi_cmd *cmd,
4547 struct iscsi_conn *conn)
4548 {
4549 int ret = 0;
4550
4551 switch (cmd->logout_reason) {
4552 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4553 switch (cmd->logout_response) {
4554 case ISCSI_LOGOUT_SUCCESS:
4555 case ISCSI_LOGOUT_CLEANUP_FAILED:
4556 default:
4557 iscsit_logout_post_handler_closesession(conn);
4558 break;
4559 }
4560 ret = 0;
4561 break;
4562 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4563 if (conn->cid == cmd->logout_cid) {
4564 switch (cmd->logout_response) {
4565 case ISCSI_LOGOUT_SUCCESS:
4566 case ISCSI_LOGOUT_CLEANUP_FAILED:
4567 default:
4568 iscsit_logout_post_handler_samecid(conn);
4569 break;
4570 }
4571 ret = 0;
4572 } else {
4573 switch (cmd->logout_response) {
4574 case ISCSI_LOGOUT_SUCCESS:
4575 iscsit_logout_post_handler_diffcid(conn,
4576 cmd->logout_cid);
4577 break;
4578 case ISCSI_LOGOUT_CID_NOT_FOUND:
4579 case ISCSI_LOGOUT_CLEANUP_FAILED:
4580 default:
4581 break;
4582 }
4583 ret = 1;
4584 }
4585 break;
4586 case ISCSI_LOGOUT_REASON_RECOVERY:
4587 switch (cmd->logout_response) {
4588 case ISCSI_LOGOUT_SUCCESS:
4589 case ISCSI_LOGOUT_CID_NOT_FOUND:
4590 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4591 case ISCSI_LOGOUT_CLEANUP_FAILED:
4592 default:
4593 break;
4594 }
4595 ret = 1;
4596 break;
4597 default:
4598 break;
4599
4600 }
4601 return ret;
4602 }
4603 EXPORT_SYMBOL(iscsit_logout_post_handler);
4604
4605 void iscsit_fail_session(struct iscsi_session *sess)
4606 {
4607 struct iscsi_conn *conn;
4608
4609 spin_lock_bh(&sess->conn_lock);
4610 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4611 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4612 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4613 }
4614 spin_unlock_bh(&sess->conn_lock);
4615
4616 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4617 sess->session_state = TARG_SESS_STATE_FAILED;
4618 }
4619
4620 int iscsit_free_session(struct iscsi_session *sess)
4621 {
4622 u16 conn_count = atomic_read(&sess->nconn);
4623 struct iscsi_conn *conn, *conn_tmp = NULL;
4624 int is_last;
4625
4626 spin_lock_bh(&sess->conn_lock);
4627 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4628
4629 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4630 conn_list) {
4631 if (conn_count == 0)
4632 break;
4633
4634 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4635 is_last = 1;
4636 } else {
4637 iscsit_inc_conn_usage_count(conn_tmp);
4638 is_last = 0;
4639 }
4640 iscsit_inc_conn_usage_count(conn);
4641
4642 spin_unlock_bh(&sess->conn_lock);
4643 iscsit_cause_connection_reinstatement(conn, 1);
4644 spin_lock_bh(&sess->conn_lock);
4645
4646 iscsit_dec_conn_usage_count(conn);
4647 if (is_last == 0)
4648 iscsit_dec_conn_usage_count(conn_tmp);
4649
4650 conn_count--;
4651 }
4652
4653 if (atomic_read(&sess->nconn)) {
4654 spin_unlock_bh(&sess->conn_lock);
4655 wait_for_completion(&sess->session_wait_comp);
4656 } else
4657 spin_unlock_bh(&sess->conn_lock);
4658
4659 target_put_session(sess->se_sess);
4660 return 0;
4661 }
4662
4663 void iscsit_stop_session(
4664 struct iscsi_session *sess,
4665 int session_sleep,
4666 int connection_sleep)
4667 {
4668 u16 conn_count = atomic_read(&sess->nconn);
4669 struct iscsi_conn *conn, *conn_tmp = NULL;
4670 int is_last;
4671
4672 spin_lock_bh(&sess->conn_lock);
4673 if (session_sleep)
4674 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4675
4676 if (connection_sleep) {
4677 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4678 conn_list) {
4679 if (conn_count == 0)
4680 break;
4681
4682 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4683 is_last = 1;
4684 } else {
4685 iscsit_inc_conn_usage_count(conn_tmp);
4686 is_last = 0;
4687 }
4688 iscsit_inc_conn_usage_count(conn);
4689
4690 spin_unlock_bh(&sess->conn_lock);
4691 iscsit_cause_connection_reinstatement(conn, 1);
4692 spin_lock_bh(&sess->conn_lock);
4693
4694 iscsit_dec_conn_usage_count(conn);
4695 if (is_last == 0)
4696 iscsit_dec_conn_usage_count(conn_tmp);
4697 conn_count--;
4698 }
4699 } else {
4700 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4701 iscsit_cause_connection_reinstatement(conn, 0);
4702 }
4703
4704 if (session_sleep && atomic_read(&sess->nconn)) {
4705 spin_unlock_bh(&sess->conn_lock);
4706 wait_for_completion(&sess->session_wait_comp);
4707 } else
4708 spin_unlock_bh(&sess->conn_lock);
4709 }
4710
4711 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4712 {
4713 struct iscsi_session *sess;
4714 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4715 struct se_session *se_sess, *se_sess_tmp;
4716 int session_count = 0;
4717
4718 spin_lock_bh(&se_tpg->session_lock);
4719 if (tpg->nsessions && !force) {
4720 spin_unlock_bh(&se_tpg->session_lock);
4721 return -1;
4722 }
4723
4724 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4725 sess_list) {
4726 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4727
4728 spin_lock(&sess->conn_lock);
4729 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4730 atomic_read(&sess->session_logout) ||
4731 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4732 spin_unlock(&sess->conn_lock);
4733 continue;
4734 }
4735 atomic_set(&sess->session_reinstatement, 1);
4736 spin_unlock(&sess->conn_lock);
4737 spin_unlock_bh(&se_tpg->session_lock);
4738
4739 iscsit_free_session(sess);
4740 spin_lock_bh(&se_tpg->session_lock);
4741
4742 session_count++;
4743 }
4744 spin_unlock_bh(&se_tpg->session_lock);
4745
4746 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4747 " Group: %hu\n", session_count, tpg->tpgt);
4748 return 0;
4749 }
4750
4751 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4752 MODULE_VERSION("4.1.x");
4753 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4754 MODULE_LICENSE("GPL");
4755
4756 module_init(iscsi_target_init_module);
4757 module_exit(iscsi_target_cleanup_module);
Linux with added FPC-III support