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iscsi-target: Fix incorrect np->np_thread NULL assignment
[deliverable/linux.git] / drivers / target / iscsi / iscsi_target.c
1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19 #include <linux/string.h>
20 #include <linux/kthread.h>
21 #include <linux/crypto.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/idr.h>
25 #include <asm/unaligned.h>
26 #include <scsi/scsi_device.h>
27 #include <scsi/iscsi_proto.h>
28 #include <scsi/scsi_tcq.h>
29 #include <target/target_core_base.h>
30 #include <target/target_core_fabric.h>
31 #include <target/target_core_configfs.h>
32
33 #include "iscsi_target_core.h"
34 #include "iscsi_target_parameters.h"
35 #include "iscsi_target_seq_pdu_list.h"
36 #include "iscsi_target_tq.h"
37 #include "iscsi_target_configfs.h"
38 #include "iscsi_target_datain_values.h"
39 #include "iscsi_target_erl0.h"
40 #include "iscsi_target_erl1.h"
41 #include "iscsi_target_erl2.h"
42 #include "iscsi_target_login.h"
43 #include "iscsi_target_tmr.h"
44 #include "iscsi_target_tpg.h"
45 #include "iscsi_target_util.h"
46 #include "iscsi_target.h"
47 #include "iscsi_target_device.h"
48 #include "iscsi_target_stat.h"
49
50 #include <target/iscsi/iscsi_transport.h>
51
52 static LIST_HEAD(g_tiqn_list);
53 static LIST_HEAD(g_np_list);
54 static DEFINE_SPINLOCK(tiqn_lock);
55 static DEFINE_SPINLOCK(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 static struct iscsi_np *iscsit_get_np(
311 struct __kernel_sockaddr_storage *sockaddr,
312 int network_transport)
313 {
314 struct iscsi_np *np;
315 bool match;
316
317 spin_lock_bh(&np_lock);
318 list_for_each_entry(np, &g_np_list, np_list) {
319 spin_lock(&np->np_thread_lock);
320 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
321 spin_unlock(&np->np_thread_lock);
322 continue;
323 }
324
325 match = iscsit_check_np_match(sockaddr, np, network_transport);
326 if (match == true) {
327 /*
328 * Increment the np_exports reference count now to
329 * prevent iscsit_del_np() below from being called
330 * while iscsi_tpg_add_network_portal() is called.
331 */
332 np->np_exports++;
333 spin_unlock(&np->np_thread_lock);
334 spin_unlock_bh(&np_lock);
335 return np;
336 }
337 spin_unlock(&np->np_thread_lock);
338 }
339 spin_unlock_bh(&np_lock);
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 * Locate the existing struct iscsi_np if already active..
355 */
356 np = iscsit_get_np(sockaddr, network_transport);
357 if (np)
358 return np;
359
360 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
361 if (!np) {
362 pr_err("Unable to allocate memory for struct iscsi_np\n");
363 return ERR_PTR(-ENOMEM);
364 }
365
366 np->np_flags |= NPF_IP_NETWORK;
367 if (sockaddr->ss_family == AF_INET6) {
368 sock_in6 = (struct sockaddr_in6 *)sockaddr;
369 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
370 np->np_port = ntohs(sock_in6->sin6_port);
371 } else {
372 sock_in = (struct sockaddr_in *)sockaddr;
373 sprintf(np->np_ip, "%s", ip_str);
374 np->np_port = ntohs(sock_in->sin_port);
375 }
376
377 np->np_network_transport = network_transport;
378 spin_lock_init(&np->np_thread_lock);
379 init_completion(&np->np_restart_comp);
380 INIT_LIST_HEAD(&np->np_list);
381
382 ret = iscsi_target_setup_login_socket(np, sockaddr);
383 if (ret != 0) {
384 kfree(np);
385 return ERR_PTR(ret);
386 }
387
388 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
389 if (IS_ERR(np->np_thread)) {
390 pr_err("Unable to create kthread: iscsi_np\n");
391 ret = PTR_ERR(np->np_thread);
392 kfree(np);
393 return ERR_PTR(ret);
394 }
395 /*
396 * Increment the np_exports reference count now to prevent
397 * iscsit_del_np() below from being run while a new call to
398 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
399 * active. We don't need to hold np->np_thread_lock at this
400 * point because iscsi_np has not been added to g_np_list yet.
401 */
402 np->np_exports = 1;
403
404 spin_lock_bh(&np_lock);
405 list_add_tail(&np->np_list, &g_np_list);
406 spin_unlock_bh(&np_lock);
407
408 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
409 np->np_ip, np->np_port, np->np_transport->name);
410
411 return np;
412 }
413
414 int iscsit_reset_np_thread(
415 struct iscsi_np *np,
416 struct iscsi_tpg_np *tpg_np,
417 struct iscsi_portal_group *tpg,
418 bool shutdown)
419 {
420 spin_lock_bh(&np->np_thread_lock);
421 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
422 spin_unlock_bh(&np->np_thread_lock);
423 return 0;
424 }
425 np->np_thread_state = ISCSI_NP_THREAD_RESET;
426
427 if (np->np_thread) {
428 spin_unlock_bh(&np->np_thread_lock);
429 send_sig(SIGINT, np->np_thread, 1);
430 wait_for_completion(&np->np_restart_comp);
431 spin_lock_bh(&np->np_thread_lock);
432 }
433 spin_unlock_bh(&np->np_thread_lock);
434
435 if (tpg_np && shutdown) {
436 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
437
438 wait_for_completion(&tpg_np->tpg_np_comp);
439 }
440
441 return 0;
442 }
443
444 static void iscsit_free_np(struct iscsi_np *np)
445 {
446 if (np->np_socket)
447 sock_release(np->np_socket);
448 }
449
450 int iscsit_del_np(struct iscsi_np *np)
451 {
452 spin_lock_bh(&np->np_thread_lock);
453 np->np_exports--;
454 if (np->np_exports) {
455 spin_unlock_bh(&np->np_thread_lock);
456 return 0;
457 }
458 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
459 spin_unlock_bh(&np->np_thread_lock);
460
461 if (np->np_thread) {
462 /*
463 * We need to send the signal to wakeup Linux/Net
464 * which may be sleeping in sock_accept()..
465 */
466 send_sig(SIGINT, np->np_thread, 1);
467 kthread_stop(np->np_thread);
468 np->np_thread = NULL;
469 }
470
471 np->np_transport->iscsit_free_np(np);
472
473 spin_lock_bh(&np_lock);
474 list_del(&np->np_list);
475 spin_unlock_bh(&np_lock);
476
477 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
478 np->np_ip, np->np_port, np->np_transport->name);
479
480 iscsit_put_transport(np->np_transport);
481 kfree(np);
482 return 0;
483 }
484
485 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
486 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
487
488 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
489 {
490 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
491 return 0;
492 }
493
494 static struct iscsit_transport iscsi_target_transport = {
495 .name = "iSCSI/TCP",
496 .transport_type = ISCSI_TCP,
497 .owner = NULL,
498 .iscsit_setup_np = iscsit_setup_np,
499 .iscsit_accept_np = iscsit_accept_np,
500 .iscsit_free_np = iscsit_free_np,
501 .iscsit_get_login_rx = iscsit_get_login_rx,
502 .iscsit_put_login_tx = iscsit_put_login_tx,
503 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
504 .iscsit_immediate_queue = iscsit_immediate_queue,
505 .iscsit_response_queue = iscsit_response_queue,
506 .iscsit_queue_data_in = iscsit_queue_rsp,
507 .iscsit_queue_status = iscsit_queue_rsp,
508 };
509
510 static int __init iscsi_target_init_module(void)
511 {
512 int ret = 0;
513
514 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
515
516 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
517 if (!iscsit_global) {
518 pr_err("Unable to allocate memory for iscsit_global\n");
519 return -1;
520 }
521 mutex_init(&auth_id_lock);
522 spin_lock_init(&sess_idr_lock);
523 idr_init(&tiqn_idr);
524 idr_init(&sess_idr);
525
526 ret = iscsi_target_register_configfs();
527 if (ret < 0)
528 goto out;
529
530 ret = iscsi_thread_set_init();
531 if (ret < 0)
532 goto configfs_out;
533
534 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
535 TARGET_THREAD_SET_COUNT) {
536 pr_err("iscsi_allocate_thread_sets() returned"
537 " unexpected value!\n");
538 goto ts_out1;
539 }
540
541 lio_qr_cache = kmem_cache_create("lio_qr_cache",
542 sizeof(struct iscsi_queue_req),
543 __alignof__(struct iscsi_queue_req), 0, NULL);
544 if (!lio_qr_cache) {
545 pr_err("nable to kmem_cache_create() for"
546 " lio_qr_cache\n");
547 goto ts_out2;
548 }
549
550 lio_dr_cache = kmem_cache_create("lio_dr_cache",
551 sizeof(struct iscsi_datain_req),
552 __alignof__(struct iscsi_datain_req), 0, NULL);
553 if (!lio_dr_cache) {
554 pr_err("Unable to kmem_cache_create() for"
555 " lio_dr_cache\n");
556 goto qr_out;
557 }
558
559 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
560 sizeof(struct iscsi_ooo_cmdsn),
561 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
562 if (!lio_ooo_cache) {
563 pr_err("Unable to kmem_cache_create() for"
564 " lio_ooo_cache\n");
565 goto dr_out;
566 }
567
568 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
569 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
570 0, NULL);
571 if (!lio_r2t_cache) {
572 pr_err("Unable to kmem_cache_create() for"
573 " lio_r2t_cache\n");
574 goto ooo_out;
575 }
576
577 iscsit_register_transport(&iscsi_target_transport);
578
579 if (iscsit_load_discovery_tpg() < 0)
580 goto r2t_out;
581
582 return ret;
583 r2t_out:
584 kmem_cache_destroy(lio_r2t_cache);
585 ooo_out:
586 kmem_cache_destroy(lio_ooo_cache);
587 dr_out:
588 kmem_cache_destroy(lio_dr_cache);
589 qr_out:
590 kmem_cache_destroy(lio_qr_cache);
591 ts_out2:
592 iscsi_deallocate_thread_sets();
593 ts_out1:
594 iscsi_thread_set_free();
595 configfs_out:
596 iscsi_target_deregister_configfs();
597 out:
598 kfree(iscsit_global);
599 return -ENOMEM;
600 }
601
602 static void __exit iscsi_target_cleanup_module(void)
603 {
604 iscsi_deallocate_thread_sets();
605 iscsi_thread_set_free();
606 iscsit_release_discovery_tpg();
607 iscsit_unregister_transport(&iscsi_target_transport);
608 kmem_cache_destroy(lio_qr_cache);
609 kmem_cache_destroy(lio_dr_cache);
610 kmem_cache_destroy(lio_ooo_cache);
611 kmem_cache_destroy(lio_r2t_cache);
612
613 iscsi_target_deregister_configfs();
614
615 kfree(iscsit_global);
616 }
617
618 static int iscsit_add_reject(
619 struct iscsi_conn *conn,
620 u8 reason,
621 unsigned char *buf)
622 {
623 struct iscsi_cmd *cmd;
624
625 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
626 if (!cmd)
627 return -1;
628
629 cmd->iscsi_opcode = ISCSI_OP_REJECT;
630 cmd->reject_reason = reason;
631
632 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
633 if (!cmd->buf_ptr) {
634 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
635 iscsit_free_cmd(cmd, false);
636 return -1;
637 }
638
639 spin_lock_bh(&conn->cmd_lock);
640 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
641 spin_unlock_bh(&conn->cmd_lock);
642
643 cmd->i_state = ISTATE_SEND_REJECT;
644 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
645
646 return -1;
647 }
648
649 static int iscsit_add_reject_from_cmd(
650 struct iscsi_cmd *cmd,
651 u8 reason,
652 bool add_to_conn,
653 unsigned char *buf)
654 {
655 struct iscsi_conn *conn;
656
657 if (!cmd->conn) {
658 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
659 cmd->init_task_tag);
660 return -1;
661 }
662 conn = cmd->conn;
663
664 cmd->iscsi_opcode = ISCSI_OP_REJECT;
665 cmd->reject_reason = reason;
666
667 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
668 if (!cmd->buf_ptr) {
669 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
670 iscsit_free_cmd(cmd, false);
671 return -1;
672 }
673
674 if (add_to_conn) {
675 spin_lock_bh(&conn->cmd_lock);
676 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
677 spin_unlock_bh(&conn->cmd_lock);
678 }
679
680 cmd->i_state = ISTATE_SEND_REJECT;
681 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
682 /*
683 * Perform the kref_put now if se_cmd has already been setup by
684 * scsit_setup_scsi_cmd()
685 */
686 if (cmd->se_cmd.se_tfo != NULL) {
687 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
688 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
689 }
690 return -1;
691 }
692
693 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
694 unsigned char *buf)
695 {
696 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
697 }
698
699 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
700 {
701 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
702 }
703
704 /*
705 * Map some portion of the allocated scatterlist to an iovec, suitable for
706 * kernel sockets to copy data in/out.
707 */
708 static int iscsit_map_iovec(
709 struct iscsi_cmd *cmd,
710 struct kvec *iov,
711 u32 data_offset,
712 u32 data_length)
713 {
714 u32 i = 0;
715 struct scatterlist *sg;
716 unsigned int page_off;
717
718 /*
719 * We know each entry in t_data_sg contains a page.
720 */
721 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
722 page_off = (data_offset % PAGE_SIZE);
723
724 cmd->first_data_sg = sg;
725 cmd->first_data_sg_off = page_off;
726
727 while (data_length) {
728 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
729
730 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
731 iov[i].iov_len = cur_len;
732
733 data_length -= cur_len;
734 page_off = 0;
735 sg = sg_next(sg);
736 i++;
737 }
738
739 cmd->kmapped_nents = i;
740
741 return i;
742 }
743
744 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
745 {
746 u32 i;
747 struct scatterlist *sg;
748
749 sg = cmd->first_data_sg;
750
751 for (i = 0; i < cmd->kmapped_nents; i++)
752 kunmap(sg_page(&sg[i]));
753 }
754
755 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
756 {
757 LIST_HEAD(ack_list);
758 struct iscsi_cmd *cmd, *cmd_p;
759
760 conn->exp_statsn = exp_statsn;
761
762 if (conn->sess->sess_ops->RDMAExtensions)
763 return;
764
765 spin_lock_bh(&conn->cmd_lock);
766 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
767 spin_lock(&cmd->istate_lock);
768 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
769 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
770 cmd->i_state = ISTATE_REMOVE;
771 spin_unlock(&cmd->istate_lock);
772 list_move_tail(&cmd->i_conn_node, &ack_list);
773 continue;
774 }
775 spin_unlock(&cmd->istate_lock);
776 }
777 spin_unlock_bh(&conn->cmd_lock);
778
779 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
780 list_del(&cmd->i_conn_node);
781 iscsit_free_cmd(cmd, false);
782 }
783 }
784
785 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
786 {
787 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
788
789 iov_count += ISCSI_IOV_DATA_BUFFER;
790
791 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
792 if (!cmd->iov_data) {
793 pr_err("Unable to allocate cmd->iov_data\n");
794 return -ENOMEM;
795 }
796
797 cmd->orig_iov_data_count = iov_count;
798 return 0;
799 }
800
801 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
802 unsigned char *buf)
803 {
804 int data_direction, payload_length;
805 struct iscsi_scsi_req *hdr;
806 int iscsi_task_attr;
807 int sam_task_attr;
808
809 atomic_long_inc(&conn->sess->cmd_pdus);
810
811 hdr = (struct iscsi_scsi_req *) buf;
812 payload_length = ntoh24(hdr->dlength);
813
814 /* FIXME; Add checks for AdditionalHeaderSegment */
815
816 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
817 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
818 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
819 " not set. Bad iSCSI Initiator.\n");
820 return iscsit_add_reject_cmd(cmd,
821 ISCSI_REASON_BOOKMARK_INVALID, buf);
822 }
823
824 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
825 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
826 /*
827 * From RFC-3720 Section 10.3.1:
828 *
829 * "Either or both of R and W MAY be 1 when either the
830 * Expected Data Transfer Length and/or Bidirectional Read
831 * Expected Data Transfer Length are 0"
832 *
833 * For this case, go ahead and clear the unnecssary bits
834 * to avoid any confusion with ->data_direction.
835 */
836 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
837 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
838
839 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
840 " set when Expected Data Transfer Length is 0 for"
841 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
842 }
843
844 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
845 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
846 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
847 " MUST be set if Expected Data Transfer Length is not 0."
848 " Bad iSCSI Initiator\n");
849 return iscsit_add_reject_cmd(cmd,
850 ISCSI_REASON_BOOKMARK_INVALID, buf);
851 }
852
853 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
854 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
855 pr_err("Bidirectional operations not supported!\n");
856 return iscsit_add_reject_cmd(cmd,
857 ISCSI_REASON_BOOKMARK_INVALID, buf);
858 }
859
860 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
861 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
862 " Scsi Command PDU.\n");
863 return iscsit_add_reject_cmd(cmd,
864 ISCSI_REASON_BOOKMARK_INVALID, buf);
865 }
866
867 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
868 pr_err("ImmediateData=No but DataSegmentLength=%u,"
869 " protocol error.\n", payload_length);
870 return iscsit_add_reject_cmd(cmd,
871 ISCSI_REASON_PROTOCOL_ERROR, buf);
872 }
873
874 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
875 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
876 pr_err("Expected Data Transfer Length and Length of"
877 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
878 " bit is not set protocol error\n");
879 return iscsit_add_reject_cmd(cmd,
880 ISCSI_REASON_PROTOCOL_ERROR, buf);
881 }
882
883 if (payload_length > be32_to_cpu(hdr->data_length)) {
884 pr_err("DataSegmentLength: %u is greater than"
885 " EDTL: %u, protocol error.\n", payload_length,
886 hdr->data_length);
887 return iscsit_add_reject_cmd(cmd,
888 ISCSI_REASON_PROTOCOL_ERROR, buf);
889 }
890
891 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
892 pr_err("DataSegmentLength: %u is greater than"
893 " MaxXmitDataSegmentLength: %u, protocol error.\n",
894 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
895 return iscsit_add_reject_cmd(cmd,
896 ISCSI_REASON_PROTOCOL_ERROR, buf);
897 }
898
899 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
900 pr_err("DataSegmentLength: %u is greater than"
901 " FirstBurstLength: %u, protocol error.\n",
902 payload_length, conn->sess->sess_ops->FirstBurstLength);
903 return iscsit_add_reject_cmd(cmd,
904 ISCSI_REASON_BOOKMARK_INVALID, buf);
905 }
906
907 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
908 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
909 DMA_NONE;
910
911 cmd->data_direction = data_direction;
912 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
913 /*
914 * Figure out the SAM Task Attribute for the incoming SCSI CDB
915 */
916 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
917 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
918 sam_task_attr = MSG_SIMPLE_TAG;
919 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
920 sam_task_attr = MSG_ORDERED_TAG;
921 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
922 sam_task_attr = MSG_HEAD_TAG;
923 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
924 sam_task_attr = MSG_ACA_TAG;
925 else {
926 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
927 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
928 sam_task_attr = MSG_SIMPLE_TAG;
929 }
930
931 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
932 cmd->i_state = ISTATE_NEW_CMD;
933 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
934 cmd->immediate_data = (payload_length) ? 1 : 0;
935 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
936 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
937 if (cmd->unsolicited_data)
938 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
939
940 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
941 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
942 spin_lock_bh(&conn->sess->ttt_lock);
943 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
944 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
945 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
946 spin_unlock_bh(&conn->sess->ttt_lock);
947 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
948 cmd->targ_xfer_tag = 0xFFFFFFFF;
949 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
950 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
951 cmd->first_burst_len = payload_length;
952
953 if (!conn->sess->sess_ops->RDMAExtensions &&
954 cmd->data_direction == DMA_FROM_DEVICE) {
955 struct iscsi_datain_req *dr;
956
957 dr = iscsit_allocate_datain_req();
958 if (!dr)
959 return iscsit_add_reject_cmd(cmd,
960 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
961
962 iscsit_attach_datain_req(cmd, dr);
963 }
964
965 /*
966 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
967 */
968 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
969 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
970 cmd->data_direction, sam_task_attr,
971 cmd->sense_buffer + 2);
972
973 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
974 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
975 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
976 conn->cid);
977
978 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
979
980 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
981 scsilun_to_int(&hdr->lun));
982 if (cmd->sense_reason)
983 goto attach_cmd;
984
985 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
986 if (cmd->sense_reason) {
987 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
988 return iscsit_add_reject_cmd(cmd,
989 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
990 }
991
992 goto attach_cmd;
993 }
994
995 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
996 return iscsit_add_reject_cmd(cmd,
997 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
998 }
999
1000 attach_cmd:
1001 spin_lock_bh(&conn->cmd_lock);
1002 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1003 spin_unlock_bh(&conn->cmd_lock);
1004 /*
1005 * Check if we need to delay processing because of ALUA
1006 * Active/NonOptimized primary access state..
1007 */
1008 core_alua_check_nonop_delay(&cmd->se_cmd);
1009
1010 return 0;
1011 }
1012 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1013
1014 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1015 {
1016 iscsit_set_dataout_sequence_values(cmd);
1017
1018 spin_lock_bh(&cmd->dataout_timeout_lock);
1019 iscsit_start_dataout_timer(cmd, cmd->conn);
1020 spin_unlock_bh(&cmd->dataout_timeout_lock);
1021 }
1022 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1023
1024 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1025 struct iscsi_scsi_req *hdr)
1026 {
1027 int cmdsn_ret = 0;
1028 /*
1029 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1030 * the Immediate Bit is not set, and no Immediate
1031 * Data is attached.
1032 *
1033 * A PDU/CmdSN carrying Immediate Data can only
1034 * be processed after the DataCRC has passed.
1035 * If the DataCRC fails, the CmdSN MUST NOT
1036 * be acknowledged. (See below)
1037 */
1038 if (!cmd->immediate_data) {
1039 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1040 (unsigned char *)hdr, hdr->cmdsn);
1041 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1042 return -1;
1043 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1044 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1045 return 0;
1046 }
1047 }
1048
1049 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1050
1051 /*
1052 * If no Immediate Data is attached, it's OK to return now.
1053 */
1054 if (!cmd->immediate_data) {
1055 if (!cmd->sense_reason && cmd->unsolicited_data)
1056 iscsit_set_unsoliticed_dataout(cmd);
1057 if (!cmd->sense_reason)
1058 return 0;
1059
1060 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1061 return 0;
1062 }
1063
1064 /*
1065 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1066 * execution. These exceptions are processed in CmdSN order using
1067 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1068 */
1069 if (cmd->sense_reason) {
1070 if (cmd->reject_reason)
1071 return 0;
1072
1073 return 1;
1074 }
1075 /*
1076 * Call directly into transport_generic_new_cmd() to perform
1077 * the backend memory allocation.
1078 */
1079 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1080 if (cmd->sense_reason)
1081 return 1;
1082
1083 return 0;
1084 }
1085 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1086
1087 static int
1088 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1089 bool dump_payload)
1090 {
1091 struct iscsi_conn *conn = cmd->conn;
1092 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1093 /*
1094 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1095 */
1096 if (dump_payload == true)
1097 goto after_immediate_data;
1098
1099 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1100 cmd->first_burst_len);
1101 after_immediate_data:
1102 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1103 /*
1104 * A PDU/CmdSN carrying Immediate Data passed
1105 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1106 * Immediate Bit is not set.
1107 */
1108 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1109 (unsigned char *)hdr, hdr->cmdsn);
1110 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1111 return -1;
1112
1113 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1114 int rc;
1115
1116 rc = iscsit_dump_data_payload(cmd->conn,
1117 cmd->first_burst_len, 1);
1118 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1119 return rc;
1120 } else if (cmd->unsolicited_data)
1121 iscsit_set_unsoliticed_dataout(cmd);
1122
1123 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1124 /*
1125 * Immediate Data failed DataCRC and ERL>=1,
1126 * silently drop this PDU and let the initiator
1127 * plug the CmdSN gap.
1128 *
1129 * FIXME: Send Unsolicited NOPIN with reserved
1130 * TTT here to help the initiator figure out
1131 * the missing CmdSN, although they should be
1132 * intelligent enough to determine the missing
1133 * CmdSN and issue a retry to plug the sequence.
1134 */
1135 cmd->i_state = ISTATE_REMOVE;
1136 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1137 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1138 return -1;
1139
1140 return 0;
1141 }
1142
1143 static int
1144 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1145 unsigned char *buf)
1146 {
1147 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1148 int rc, immed_data;
1149 bool dump_payload = false;
1150
1151 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1152 if (rc < 0)
1153 return 0;
1154 /*
1155 * Allocation iovecs needed for struct socket operations for
1156 * traditional iSCSI block I/O.
1157 */
1158 if (iscsit_allocate_iovecs(cmd) < 0) {
1159 return iscsit_add_reject_cmd(cmd,
1160 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1161 }
1162 immed_data = cmd->immediate_data;
1163
1164 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1165 if (rc < 0)
1166 return rc;
1167 else if (rc > 0)
1168 dump_payload = true;
1169
1170 if (!immed_data)
1171 return 0;
1172
1173 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1174 }
1175
1176 static u32 iscsit_do_crypto_hash_sg(
1177 struct hash_desc *hash,
1178 struct iscsi_cmd *cmd,
1179 u32 data_offset,
1180 u32 data_length,
1181 u32 padding,
1182 u8 *pad_bytes)
1183 {
1184 u32 data_crc;
1185 u32 i;
1186 struct scatterlist *sg;
1187 unsigned int page_off;
1188
1189 crypto_hash_init(hash);
1190
1191 sg = cmd->first_data_sg;
1192 page_off = cmd->first_data_sg_off;
1193
1194 i = 0;
1195 while (data_length) {
1196 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1197
1198 crypto_hash_update(hash, &sg[i], cur_len);
1199
1200 data_length -= cur_len;
1201 page_off = 0;
1202 i++;
1203 }
1204
1205 if (padding) {
1206 struct scatterlist pad_sg;
1207
1208 sg_init_one(&pad_sg, pad_bytes, padding);
1209 crypto_hash_update(hash, &pad_sg, padding);
1210 }
1211 crypto_hash_final(hash, (u8 *) &data_crc);
1212
1213 return data_crc;
1214 }
1215
1216 static void iscsit_do_crypto_hash_buf(
1217 struct hash_desc *hash,
1218 const void *buf,
1219 u32 payload_length,
1220 u32 padding,
1221 u8 *pad_bytes,
1222 u8 *data_crc)
1223 {
1224 struct scatterlist sg;
1225
1226 crypto_hash_init(hash);
1227
1228 sg_init_one(&sg, buf, payload_length);
1229 crypto_hash_update(hash, &sg, payload_length);
1230
1231 if (padding) {
1232 sg_init_one(&sg, pad_bytes, padding);
1233 crypto_hash_update(hash, &sg, padding);
1234 }
1235 crypto_hash_final(hash, data_crc);
1236 }
1237
1238 int
1239 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1240 struct iscsi_cmd **out_cmd)
1241 {
1242 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1243 struct iscsi_cmd *cmd = NULL;
1244 struct se_cmd *se_cmd;
1245 u32 payload_length = ntoh24(hdr->dlength);
1246 int rc;
1247
1248 if (!payload_length) {
1249 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1250 return 0;
1251 }
1252
1253 /* iSCSI write */
1254 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1255
1256 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1257 pr_err("DataSegmentLength: %u is greater than"
1258 " MaxXmitDataSegmentLength: %u\n", payload_length,
1259 conn->conn_ops->MaxXmitDataSegmentLength);
1260 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1261 buf);
1262 }
1263
1264 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1265 payload_length);
1266 if (!cmd)
1267 return 0;
1268
1269 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1270 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1271 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1272 payload_length, conn->cid);
1273
1274 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1275 pr_err("Command ITT: 0x%08x received DataOUT after"
1276 " last DataOUT received, dumping payload\n",
1277 cmd->init_task_tag);
1278 return iscsit_dump_data_payload(conn, payload_length, 1);
1279 }
1280
1281 if (cmd->data_direction != DMA_TO_DEVICE) {
1282 pr_err("Command ITT: 0x%08x received DataOUT for a"
1283 " NON-WRITE command.\n", cmd->init_task_tag);
1284 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
1285 }
1286 se_cmd = &cmd->se_cmd;
1287 iscsit_mod_dataout_timer(cmd);
1288
1289 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1290 pr_err("DataOut Offset: %u, Length %u greater than"
1291 " iSCSI Command EDTL %u, protocol error.\n",
1292 hdr->offset, payload_length, cmd->se_cmd.data_length);
1293 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1294 }
1295
1296 if (cmd->unsolicited_data) {
1297 int dump_unsolicited_data = 0;
1298
1299 if (conn->sess->sess_ops->InitialR2T) {
1300 pr_err("Received unexpected unsolicited data"
1301 " while InitialR2T=Yes, protocol error.\n");
1302 transport_send_check_condition_and_sense(&cmd->se_cmd,
1303 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1304 return -1;
1305 }
1306 /*
1307 * Special case for dealing with Unsolicited DataOUT
1308 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1309 * failures;
1310 */
1311
1312 /* Something's amiss if we're not in WRITE_PENDING state... */
1313 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1314 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1315 dump_unsolicited_data = 1;
1316
1317 if (dump_unsolicited_data) {
1318 /*
1319 * Check if a delayed TASK_ABORTED status needs to
1320 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1321 * received with the unsolicitied data out.
1322 */
1323 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1324 iscsit_stop_dataout_timer(cmd);
1325
1326 transport_check_aborted_status(se_cmd,
1327 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1328 return iscsit_dump_data_payload(conn, payload_length, 1);
1329 }
1330 } else {
1331 /*
1332 * For the normal solicited data path:
1333 *
1334 * Check for a delayed TASK_ABORTED status and dump any
1335 * incoming data out payload if one exists. Also, when the
1336 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1337 * data out sequence, we decrement outstanding_r2ts. Once
1338 * outstanding_r2ts reaches zero, go ahead and send the delayed
1339 * TASK_ABORTED status.
1340 */
1341 if (se_cmd->transport_state & CMD_T_ABORTED) {
1342 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1343 if (--cmd->outstanding_r2ts < 1) {
1344 iscsit_stop_dataout_timer(cmd);
1345 transport_check_aborted_status(
1346 se_cmd, 1);
1347 }
1348
1349 return iscsit_dump_data_payload(conn, payload_length, 1);
1350 }
1351 }
1352 /*
1353 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1354 * within-command recovery checks before receiving the payload.
1355 */
1356 rc = iscsit_check_pre_dataout(cmd, buf);
1357 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1358 return 0;
1359 else if (rc == DATAOUT_CANNOT_RECOVER)
1360 return -1;
1361
1362 *out_cmd = cmd;
1363 return 0;
1364 }
1365 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1366
1367 static int
1368 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1369 struct iscsi_data *hdr)
1370 {
1371 struct kvec *iov;
1372 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1373 u32 payload_length = ntoh24(hdr->dlength);
1374 int iov_ret, data_crc_failed = 0;
1375
1376 rx_size += payload_length;
1377 iov = &cmd->iov_data[0];
1378
1379 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1380 payload_length);
1381 if (iov_ret < 0)
1382 return -1;
1383
1384 iov_count += iov_ret;
1385
1386 padding = ((-payload_length) & 3);
1387 if (padding != 0) {
1388 iov[iov_count].iov_base = cmd->pad_bytes;
1389 iov[iov_count++].iov_len = padding;
1390 rx_size += padding;
1391 pr_debug("Receiving %u padding bytes.\n", padding);
1392 }
1393
1394 if (conn->conn_ops->DataDigest) {
1395 iov[iov_count].iov_base = &checksum;
1396 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1397 rx_size += ISCSI_CRC_LEN;
1398 }
1399
1400 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1401
1402 iscsit_unmap_iovec(cmd);
1403
1404 if (rx_got != rx_size)
1405 return -1;
1406
1407 if (conn->conn_ops->DataDigest) {
1408 u32 data_crc;
1409
1410 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1411 be32_to_cpu(hdr->offset),
1412 payload_length, padding,
1413 cmd->pad_bytes);
1414
1415 if (checksum != data_crc) {
1416 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1417 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1418 " does not match computed 0x%08x\n",
1419 hdr->itt, hdr->offset, payload_length,
1420 hdr->datasn, checksum, data_crc);
1421 data_crc_failed = 1;
1422 } else {
1423 pr_debug("Got CRC32C DataDigest 0x%08x for"
1424 " %u bytes of Data Out\n", checksum,
1425 payload_length);
1426 }
1427 }
1428
1429 return data_crc_failed;
1430 }
1431
1432 int
1433 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1434 bool data_crc_failed)
1435 {
1436 struct iscsi_conn *conn = cmd->conn;
1437 int rc, ooo_cmdsn;
1438 /*
1439 * Increment post receive data and CRC values or perform
1440 * within-command recovery.
1441 */
1442 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1443 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1444 return 0;
1445 else if (rc == DATAOUT_SEND_R2T) {
1446 iscsit_set_dataout_sequence_values(cmd);
1447 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1448 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1449 /*
1450 * Handle extra special case for out of order
1451 * Unsolicited Data Out.
1452 */
1453 spin_lock_bh(&cmd->istate_lock);
1454 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1455 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1456 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1457 spin_unlock_bh(&cmd->istate_lock);
1458
1459 iscsit_stop_dataout_timer(cmd);
1460 if (ooo_cmdsn)
1461 return 0;
1462 target_execute_cmd(&cmd->se_cmd);
1463 return 0;
1464 } else /* DATAOUT_CANNOT_RECOVER */
1465 return -1;
1466
1467 return 0;
1468 }
1469 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1470
1471 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1472 {
1473 struct iscsi_cmd *cmd = NULL;
1474 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1475 int rc;
1476 bool data_crc_failed = false;
1477
1478 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1479 if (rc < 0)
1480 return 0;
1481 else if (!cmd)
1482 return 0;
1483
1484 rc = iscsit_get_dataout(conn, cmd, hdr);
1485 if (rc < 0)
1486 return rc;
1487 else if (rc > 0)
1488 data_crc_failed = true;
1489
1490 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1491 }
1492
1493 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1494 struct iscsi_nopout *hdr)
1495 {
1496 u32 payload_length = ntoh24(hdr->dlength);
1497
1498 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1499 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1500 " not set, protocol error.\n");
1501 if (!cmd)
1502 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1503 (unsigned char *)hdr);
1504
1505 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1506 (unsigned char *)hdr);
1507 }
1508
1509 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1510 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1511 " greater than MaxXmitDataSegmentLength: %u, protocol"
1512 " error.\n", payload_length,
1513 conn->conn_ops->MaxXmitDataSegmentLength);
1514 if (!cmd)
1515 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1516 (unsigned char *)hdr);
1517
1518 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1519 (unsigned char *)hdr);
1520 }
1521
1522 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1523 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1524 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1525 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1526 payload_length);
1527 /*
1528 * This is not a response to a Unsolicited NopIN, which means
1529 * it can either be a NOPOUT ping request (with a valid ITT),
1530 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1531 * Either way, make sure we allocate an struct iscsi_cmd, as both
1532 * can contain ping data.
1533 */
1534 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1535 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1536 cmd->i_state = ISTATE_SEND_NOPIN;
1537 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1538 1 : 0);
1539 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1540 cmd->targ_xfer_tag = 0xFFFFFFFF;
1541 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1542 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1543 cmd->data_direction = DMA_NONE;
1544 }
1545
1546 return 0;
1547 }
1548 EXPORT_SYMBOL(iscsit_setup_nop_out);
1549
1550 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1551 struct iscsi_nopout *hdr)
1552 {
1553 struct iscsi_cmd *cmd_p = NULL;
1554 int cmdsn_ret = 0;
1555 /*
1556 * Initiator is expecting a NopIN ping reply..
1557 */
1558 if (hdr->itt != RESERVED_ITT) {
1559 BUG_ON(!cmd);
1560
1561 spin_lock_bh(&conn->cmd_lock);
1562 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1563 spin_unlock_bh(&conn->cmd_lock);
1564
1565 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1566
1567 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1568 iscsit_add_cmd_to_response_queue(cmd, conn,
1569 cmd->i_state);
1570 return 0;
1571 }
1572
1573 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1574 (unsigned char *)hdr, hdr->cmdsn);
1575 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1576 return 0;
1577 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1578 return -1;
1579
1580 return 0;
1581 }
1582 /*
1583 * This was a response to a unsolicited NOPIN ping.
1584 */
1585 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1586 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1587 if (!cmd_p)
1588 return -EINVAL;
1589
1590 iscsit_stop_nopin_response_timer(conn);
1591
1592 cmd_p->i_state = ISTATE_REMOVE;
1593 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1594
1595 iscsit_start_nopin_timer(conn);
1596 return 0;
1597 }
1598 /*
1599 * Otherwise, initiator is not expecting a NOPIN is response.
1600 * Just ignore for now.
1601 */
1602 return 0;
1603 }
1604 EXPORT_SYMBOL(iscsit_process_nop_out);
1605
1606 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1607 unsigned char *buf)
1608 {
1609 unsigned char *ping_data = NULL;
1610 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1611 struct kvec *iov = NULL;
1612 u32 payload_length = ntoh24(hdr->dlength);
1613 int ret;
1614
1615 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1616 if (ret < 0)
1617 return 0;
1618 /*
1619 * Handle NOP-OUT payload for traditional iSCSI sockets
1620 */
1621 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1622 u32 checksum, data_crc, padding = 0;
1623 int niov = 0, rx_got, rx_size = payload_length;
1624
1625 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1626 if (!ping_data) {
1627 pr_err("Unable to allocate memory for"
1628 " NOPOUT ping data.\n");
1629 ret = -1;
1630 goto out;
1631 }
1632
1633 iov = &cmd->iov_misc[0];
1634 iov[niov].iov_base = ping_data;
1635 iov[niov++].iov_len = payload_length;
1636
1637 padding = ((-payload_length) & 3);
1638 if (padding != 0) {
1639 pr_debug("Receiving %u additional bytes"
1640 " for padding.\n", padding);
1641 iov[niov].iov_base = &cmd->pad_bytes;
1642 iov[niov++].iov_len = padding;
1643 rx_size += padding;
1644 }
1645 if (conn->conn_ops->DataDigest) {
1646 iov[niov].iov_base = &checksum;
1647 iov[niov++].iov_len = ISCSI_CRC_LEN;
1648 rx_size += ISCSI_CRC_LEN;
1649 }
1650
1651 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1652 if (rx_got != rx_size) {
1653 ret = -1;
1654 goto out;
1655 }
1656
1657 if (conn->conn_ops->DataDigest) {
1658 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1659 ping_data, payload_length,
1660 padding, cmd->pad_bytes,
1661 (u8 *)&data_crc);
1662
1663 if (checksum != data_crc) {
1664 pr_err("Ping data CRC32C DataDigest"
1665 " 0x%08x does not match computed 0x%08x\n",
1666 checksum, data_crc);
1667 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1668 pr_err("Unable to recover from"
1669 " NOPOUT Ping DataCRC failure while in"
1670 " ERL=0.\n");
1671 ret = -1;
1672 goto out;
1673 } else {
1674 /*
1675 * Silently drop this PDU and let the
1676 * initiator plug the CmdSN gap.
1677 */
1678 pr_debug("Dropping NOPOUT"
1679 " Command CmdSN: 0x%08x due to"
1680 " DataCRC error.\n", hdr->cmdsn);
1681 ret = 0;
1682 goto out;
1683 }
1684 } else {
1685 pr_debug("Got CRC32C DataDigest"
1686 " 0x%08x for %u bytes of ping data.\n",
1687 checksum, payload_length);
1688 }
1689 }
1690
1691 ping_data[payload_length] = '\0';
1692 /*
1693 * Attach ping data to struct iscsi_cmd->buf_ptr.
1694 */
1695 cmd->buf_ptr = ping_data;
1696 cmd->buf_ptr_size = payload_length;
1697
1698 pr_debug("Got %u bytes of NOPOUT ping"
1699 " data.\n", payload_length);
1700 pr_debug("Ping Data: \"%s\"\n", ping_data);
1701 }
1702
1703 return iscsit_process_nop_out(conn, cmd, hdr);
1704 out:
1705 if (cmd)
1706 iscsit_free_cmd(cmd, false);
1707
1708 kfree(ping_data);
1709 return ret;
1710 }
1711
1712 int
1713 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1714 unsigned char *buf)
1715 {
1716 struct se_tmr_req *se_tmr;
1717 struct iscsi_tmr_req *tmr_req;
1718 struct iscsi_tm *hdr;
1719 int out_of_order_cmdsn = 0, ret;
1720 bool sess_ref = false;
1721 u8 function;
1722
1723 hdr = (struct iscsi_tm *) buf;
1724 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1725 function = hdr->flags;
1726
1727 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1728 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1729 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1730 hdr->rtt, hdr->refcmdsn, conn->cid);
1731
1732 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1733 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1734 hdr->rtt != RESERVED_ITT)) {
1735 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1736 hdr->rtt = RESERVED_ITT;
1737 }
1738
1739 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1740 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1741 pr_err("Task Management Request TASK_REASSIGN not"
1742 " issued as immediate command, bad iSCSI Initiator"
1743 "implementation\n");
1744 return iscsit_add_reject_cmd(cmd,
1745 ISCSI_REASON_PROTOCOL_ERROR, buf);
1746 }
1747 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1748 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1749 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1750
1751 cmd->data_direction = DMA_NONE;
1752
1753 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1754 if (!cmd->tmr_req) {
1755 pr_err("Unable to allocate memory for"
1756 " Task Management command!\n");
1757 return iscsit_add_reject_cmd(cmd,
1758 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1759 buf);
1760 }
1761
1762 /*
1763 * TASK_REASSIGN for ERL=2 / connection stays inside of
1764 * LIO-Target $FABRIC_MOD
1765 */
1766 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1767
1768 u8 tcm_function;
1769 int ret;
1770
1771 transport_init_se_cmd(&cmd->se_cmd,
1772 &lio_target_fabric_configfs->tf_ops,
1773 conn->sess->se_sess, 0, DMA_NONE,
1774 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1775
1776 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1777 sess_ref = true;
1778
1779 switch (function) {
1780 case ISCSI_TM_FUNC_ABORT_TASK:
1781 tcm_function = TMR_ABORT_TASK;
1782 break;
1783 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1784 tcm_function = TMR_ABORT_TASK_SET;
1785 break;
1786 case ISCSI_TM_FUNC_CLEAR_ACA:
1787 tcm_function = TMR_CLEAR_ACA;
1788 break;
1789 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1790 tcm_function = TMR_CLEAR_TASK_SET;
1791 break;
1792 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1793 tcm_function = TMR_LUN_RESET;
1794 break;
1795 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1796 tcm_function = TMR_TARGET_WARM_RESET;
1797 break;
1798 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1799 tcm_function = TMR_TARGET_COLD_RESET;
1800 break;
1801 default:
1802 pr_err("Unknown iSCSI TMR Function:"
1803 " 0x%02x\n", function);
1804 return iscsit_add_reject_cmd(cmd,
1805 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1806 }
1807
1808 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1809 tcm_function, GFP_KERNEL);
1810 if (ret < 0)
1811 return iscsit_add_reject_cmd(cmd,
1812 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1813
1814 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1815 }
1816
1817 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1818 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1819 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1820 cmd->init_task_tag = hdr->itt;
1821 cmd->targ_xfer_tag = 0xFFFFFFFF;
1822 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1823 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1824 se_tmr = cmd->se_cmd.se_tmr_req;
1825 tmr_req = cmd->tmr_req;
1826 /*
1827 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1828 */
1829 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1830 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1831 scsilun_to_int(&hdr->lun));
1832 if (ret < 0) {
1833 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1834 goto attach;
1835 }
1836 }
1837
1838 switch (function) {
1839 case ISCSI_TM_FUNC_ABORT_TASK:
1840 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1841 if (se_tmr->response)
1842 goto attach;
1843 break;
1844 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1845 case ISCSI_TM_FUNC_CLEAR_ACA:
1846 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1847 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1848 break;
1849 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1850 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1851 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1852 goto attach;
1853 }
1854 break;
1855 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1856 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1857 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1858 goto attach;
1859 }
1860 break;
1861 case ISCSI_TM_FUNC_TASK_REASSIGN:
1862 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1863 /*
1864 * Perform sanity checks on the ExpDataSN only if the
1865 * TASK_REASSIGN was successful.
1866 */
1867 if (se_tmr->response)
1868 break;
1869
1870 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1871 return iscsit_add_reject_cmd(cmd,
1872 ISCSI_REASON_BOOKMARK_INVALID, buf);
1873 break;
1874 default:
1875 pr_err("Unknown TMR function: 0x%02x, protocol"
1876 " error.\n", function);
1877 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1878 goto attach;
1879 }
1880
1881 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1882 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1883 se_tmr->call_transport = 1;
1884 attach:
1885 spin_lock_bh(&conn->cmd_lock);
1886 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1887 spin_unlock_bh(&conn->cmd_lock);
1888
1889 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1890 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1891 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1892 out_of_order_cmdsn = 1;
1893 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1894 return 0;
1895 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1896 return -1;
1897 }
1898 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1899
1900 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1901 return 0;
1902 /*
1903 * Found the referenced task, send to transport for processing.
1904 */
1905 if (se_tmr->call_transport)
1906 return transport_generic_handle_tmr(&cmd->se_cmd);
1907
1908 /*
1909 * Could not find the referenced LUN, task, or Task Management
1910 * command not authorized or supported. Change state and
1911 * let the tx_thread send the response.
1912 *
1913 * For connection recovery, this is also the default action for
1914 * TMR TASK_REASSIGN.
1915 */
1916 if (sess_ref) {
1917 pr_debug("Handle TMR, using sess_ref=true check\n");
1918 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1919 }
1920
1921 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1922 return 0;
1923 }
1924 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1925
1926 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1927 int
1928 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1929 struct iscsi_text *hdr)
1930 {
1931 u32 payload_length = ntoh24(hdr->dlength);
1932
1933 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1934 pr_err("Unable to accept text parameter length: %u"
1935 "greater than MaxXmitDataSegmentLength %u.\n",
1936 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1937 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1938 (unsigned char *)hdr);
1939 }
1940
1941 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1942 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1943 pr_err("Multi sequence text commands currently not supported\n");
1944 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1945 (unsigned char *)hdr);
1946 }
1947
1948 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1949 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1950 hdr->exp_statsn, payload_length);
1951
1952 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1953 cmd->i_state = ISTATE_SEND_TEXTRSP;
1954 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1955 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1956 cmd->targ_xfer_tag = 0xFFFFFFFF;
1957 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1958 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1959 cmd->data_direction = DMA_NONE;
1960
1961 return 0;
1962 }
1963 EXPORT_SYMBOL(iscsit_setup_text_cmd);
1964
1965 int
1966 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1967 struct iscsi_text *hdr)
1968 {
1969 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
1970 int cmdsn_ret;
1971
1972 if (!text_in) {
1973 pr_err("Unable to locate text_in buffer for sendtargets"
1974 " discovery\n");
1975 goto reject;
1976 }
1977 if (strncmp("SendTargets", text_in, 11) != 0) {
1978 pr_err("Received Text Data that is not"
1979 " SendTargets, cannot continue.\n");
1980 goto reject;
1981 }
1982 text_ptr = strchr(text_in, '=');
1983 if (!text_ptr) {
1984 pr_err("No \"=\" separator found in Text Data,"
1985 " cannot continue.\n");
1986 goto reject;
1987 }
1988 if (!strncmp("=All", text_ptr, 4)) {
1989 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
1990 } else if (!strncmp("=iqn.", text_ptr, 5) ||
1991 !strncmp("=eui.", text_ptr, 5)) {
1992 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
1993 } else {
1994 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
1995 goto reject;
1996 }
1997
1998 spin_lock_bh(&conn->cmd_lock);
1999 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2000 spin_unlock_bh(&conn->cmd_lock);
2001
2002 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2003
2004 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2005 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2006 (unsigned char *)hdr, hdr->cmdsn);
2007 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2008 return -1;
2009
2010 return 0;
2011 }
2012
2013 return iscsit_execute_cmd(cmd, 0);
2014
2015 reject:
2016 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2017 (unsigned char *)hdr);
2018 }
2019 EXPORT_SYMBOL(iscsit_process_text_cmd);
2020
2021 static int
2022 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2023 unsigned char *buf)
2024 {
2025 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2026 char *text_in = NULL;
2027 u32 payload_length = ntoh24(hdr->dlength);
2028 int rx_size, rc;
2029
2030 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2031 if (rc < 0)
2032 return 0;
2033
2034 rx_size = payload_length;
2035 if (payload_length) {
2036 u32 checksum = 0, data_crc = 0;
2037 u32 padding = 0, pad_bytes = 0;
2038 int niov = 0, rx_got;
2039 struct kvec iov[3];
2040
2041 text_in = kzalloc(payload_length, GFP_KERNEL);
2042 if (!text_in) {
2043 pr_err("Unable to allocate memory for"
2044 " incoming text parameters\n");
2045 goto reject;
2046 }
2047 cmd->text_in_ptr = text_in;
2048
2049 memset(iov, 0, 3 * sizeof(struct kvec));
2050 iov[niov].iov_base = text_in;
2051 iov[niov++].iov_len = payload_length;
2052
2053 padding = ((-payload_length) & 3);
2054 if (padding != 0) {
2055 iov[niov].iov_base = &pad_bytes;
2056 iov[niov++].iov_len = padding;
2057 rx_size += padding;
2058 pr_debug("Receiving %u additional bytes"
2059 " for padding.\n", padding);
2060 }
2061 if (conn->conn_ops->DataDigest) {
2062 iov[niov].iov_base = &checksum;
2063 iov[niov++].iov_len = ISCSI_CRC_LEN;
2064 rx_size += ISCSI_CRC_LEN;
2065 }
2066
2067 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2068 if (rx_got != rx_size)
2069 goto reject;
2070
2071 if (conn->conn_ops->DataDigest) {
2072 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2073 text_in, payload_length,
2074 padding, (u8 *)&pad_bytes,
2075 (u8 *)&data_crc);
2076
2077 if (checksum != data_crc) {
2078 pr_err("Text data CRC32C DataDigest"
2079 " 0x%08x does not match computed"
2080 " 0x%08x\n", checksum, data_crc);
2081 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2082 pr_err("Unable to recover from"
2083 " Text Data digest failure while in"
2084 " ERL=0.\n");
2085 goto reject;
2086 } else {
2087 /*
2088 * Silently drop this PDU and let the
2089 * initiator plug the CmdSN gap.
2090 */
2091 pr_debug("Dropping Text"
2092 " Command CmdSN: 0x%08x due to"
2093 " DataCRC error.\n", hdr->cmdsn);
2094 kfree(text_in);
2095 return 0;
2096 }
2097 } else {
2098 pr_debug("Got CRC32C DataDigest"
2099 " 0x%08x for %u bytes of text data.\n",
2100 checksum, payload_length);
2101 }
2102 }
2103 text_in[payload_length - 1] = '\0';
2104 pr_debug("Successfully read %d bytes of text"
2105 " data.\n", payload_length);
2106 }
2107
2108 return iscsit_process_text_cmd(conn, cmd, hdr);
2109
2110 reject:
2111 kfree(cmd->text_in_ptr);
2112 cmd->text_in_ptr = NULL;
2113 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2114 }
2115 EXPORT_SYMBOL(iscsit_handle_text_cmd);
2116
2117 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2118 {
2119 struct iscsi_conn *conn_p;
2120 struct iscsi_session *sess = conn->sess;
2121
2122 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2123 " for SID: %u.\n", conn->cid, conn->sess->sid);
2124
2125 atomic_set(&sess->session_logout, 1);
2126 atomic_set(&conn->conn_logout_remove, 1);
2127 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2128
2129 iscsit_inc_conn_usage_count(conn);
2130 iscsit_inc_session_usage_count(sess);
2131
2132 spin_lock_bh(&sess->conn_lock);
2133 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2134 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2135 continue;
2136
2137 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2138 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2139 }
2140 spin_unlock_bh(&sess->conn_lock);
2141
2142 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2143
2144 return 0;
2145 }
2146
2147 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2148 {
2149 struct iscsi_conn *l_conn;
2150 struct iscsi_session *sess = conn->sess;
2151
2152 pr_debug("Received logout request CLOSECONNECTION for CID:"
2153 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2154
2155 /*
2156 * A Logout Request with a CLOSECONNECTION reason code for a CID
2157 * can arrive on a connection with a differing CID.
2158 */
2159 if (conn->cid == cmd->logout_cid) {
2160 spin_lock_bh(&conn->state_lock);
2161 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2162 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2163
2164 atomic_set(&conn->conn_logout_remove, 1);
2165 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2166 iscsit_inc_conn_usage_count(conn);
2167
2168 spin_unlock_bh(&conn->state_lock);
2169 } else {
2170 /*
2171 * Handle all different cid CLOSECONNECTION requests in
2172 * iscsit_logout_post_handler_diffcid() as to give enough
2173 * time for any non immediate command's CmdSN to be
2174 * acknowledged on the connection in question.
2175 *
2176 * Here we simply make sure the CID is still around.
2177 */
2178 l_conn = iscsit_get_conn_from_cid(sess,
2179 cmd->logout_cid);
2180 if (!l_conn) {
2181 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2182 iscsit_add_cmd_to_response_queue(cmd, conn,
2183 cmd->i_state);
2184 return 0;
2185 }
2186
2187 iscsit_dec_conn_usage_count(l_conn);
2188 }
2189
2190 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2191
2192 return 0;
2193 }
2194
2195 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2196 {
2197 struct iscsi_session *sess = conn->sess;
2198
2199 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2200 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2201
2202 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2203 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2204 " while ERL!=2.\n");
2205 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2206 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2207 return 0;
2208 }
2209
2210 if (conn->cid == cmd->logout_cid) {
2211 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2212 " with CID: %hu on CID: %hu, implementation error.\n",
2213 cmd->logout_cid, conn->cid);
2214 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2215 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2216 return 0;
2217 }
2218
2219 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2220
2221 return 0;
2222 }
2223
2224 int
2225 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2226 unsigned char *buf)
2227 {
2228 int cmdsn_ret, logout_remove = 0;
2229 u8 reason_code = 0;
2230 struct iscsi_logout *hdr;
2231 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2232
2233 hdr = (struct iscsi_logout *) buf;
2234 reason_code = (hdr->flags & 0x7f);
2235
2236 if (tiqn) {
2237 spin_lock(&tiqn->logout_stats.lock);
2238 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2239 tiqn->logout_stats.normal_logouts++;
2240 else
2241 tiqn->logout_stats.abnormal_logouts++;
2242 spin_unlock(&tiqn->logout_stats.lock);
2243 }
2244
2245 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2246 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2247 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2248 hdr->cid, conn->cid);
2249
2250 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2251 pr_err("Received logout request on connection that"
2252 " is not in logged in state, ignoring request.\n");
2253 iscsit_free_cmd(cmd, false);
2254 return 0;
2255 }
2256
2257 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2258 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2259 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2260 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2261 cmd->targ_xfer_tag = 0xFFFFFFFF;
2262 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2263 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2264 cmd->logout_cid = be16_to_cpu(hdr->cid);
2265 cmd->logout_reason = reason_code;
2266 cmd->data_direction = DMA_NONE;
2267
2268 /*
2269 * We need to sleep in these cases (by returning 1) until the Logout
2270 * Response gets sent in the tx thread.
2271 */
2272 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2273 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2274 be16_to_cpu(hdr->cid) == conn->cid))
2275 logout_remove = 1;
2276
2277 spin_lock_bh(&conn->cmd_lock);
2278 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2279 spin_unlock_bh(&conn->cmd_lock);
2280
2281 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2282 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2283
2284 /*
2285 * Immediate commands are executed, well, immediately.
2286 * Non-Immediate Logout Commands are executed in CmdSN order.
2287 */
2288 if (cmd->immediate_cmd) {
2289 int ret = iscsit_execute_cmd(cmd, 0);
2290
2291 if (ret < 0)
2292 return ret;
2293 } else {
2294 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2295 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2296 logout_remove = 0;
2297 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2298 return -1;
2299 }
2300
2301 return logout_remove;
2302 }
2303 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2304
2305 static int iscsit_handle_snack(
2306 struct iscsi_conn *conn,
2307 unsigned char *buf)
2308 {
2309 struct iscsi_snack *hdr;
2310
2311 hdr = (struct iscsi_snack *) buf;
2312 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2313
2314 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2315 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2316 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2317 hdr->begrun, hdr->runlength, conn->cid);
2318
2319 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2320 pr_err("Initiator sent SNACK request while in"
2321 " ErrorRecoveryLevel=0.\n");
2322 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2323 buf);
2324 }
2325 /*
2326 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2327 * call from inside iscsi_send_recovery_datain_or_r2t().
2328 */
2329 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2330 case 0:
2331 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2332 hdr->itt,
2333 be32_to_cpu(hdr->ttt),
2334 be32_to_cpu(hdr->begrun),
2335 be32_to_cpu(hdr->runlength));
2336 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2337 return iscsit_handle_status_snack(conn, hdr->itt,
2338 be32_to_cpu(hdr->ttt),
2339 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2340 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2341 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2342 be32_to_cpu(hdr->begrun),
2343 be32_to_cpu(hdr->runlength));
2344 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2345 /* FIXME: Support R-Data SNACK */
2346 pr_err("R-Data SNACK Not Supported.\n");
2347 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2348 buf);
2349 default:
2350 pr_err("Unknown SNACK type 0x%02x, protocol"
2351 " error.\n", hdr->flags & 0x0f);
2352 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2353 buf);
2354 }
2355
2356 return 0;
2357 }
2358
2359 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2360 {
2361 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2362 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2363 wait_for_completion_interruptible_timeout(
2364 &conn->rx_half_close_comp,
2365 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2366 }
2367 }
2368
2369 static int iscsit_handle_immediate_data(
2370 struct iscsi_cmd *cmd,
2371 struct iscsi_scsi_req *hdr,
2372 u32 length)
2373 {
2374 int iov_ret, rx_got = 0, rx_size = 0;
2375 u32 checksum, iov_count = 0, padding = 0;
2376 struct iscsi_conn *conn = cmd->conn;
2377 struct kvec *iov;
2378
2379 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2380 if (iov_ret < 0)
2381 return IMMEDIATE_DATA_CANNOT_RECOVER;
2382
2383 rx_size = length;
2384 iov_count = iov_ret;
2385 iov = &cmd->iov_data[0];
2386
2387 padding = ((-length) & 3);
2388 if (padding != 0) {
2389 iov[iov_count].iov_base = cmd->pad_bytes;
2390 iov[iov_count++].iov_len = padding;
2391 rx_size += padding;
2392 }
2393
2394 if (conn->conn_ops->DataDigest) {
2395 iov[iov_count].iov_base = &checksum;
2396 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2397 rx_size += ISCSI_CRC_LEN;
2398 }
2399
2400 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2401
2402 iscsit_unmap_iovec(cmd);
2403
2404 if (rx_got != rx_size) {
2405 iscsit_rx_thread_wait_for_tcp(conn);
2406 return IMMEDIATE_DATA_CANNOT_RECOVER;
2407 }
2408
2409 if (conn->conn_ops->DataDigest) {
2410 u32 data_crc;
2411
2412 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2413 cmd->write_data_done, length, padding,
2414 cmd->pad_bytes);
2415
2416 if (checksum != data_crc) {
2417 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2418 " does not match computed 0x%08x\n", checksum,
2419 data_crc);
2420
2421 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2422 pr_err("Unable to recover from"
2423 " Immediate Data digest failure while"
2424 " in ERL=0.\n");
2425 iscsit_reject_cmd(cmd,
2426 ISCSI_REASON_DATA_DIGEST_ERROR,
2427 (unsigned char *)hdr);
2428 return IMMEDIATE_DATA_CANNOT_RECOVER;
2429 } else {
2430 iscsit_reject_cmd(cmd,
2431 ISCSI_REASON_DATA_DIGEST_ERROR,
2432 (unsigned char *)hdr);
2433 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2434 }
2435 } else {
2436 pr_debug("Got CRC32C DataDigest 0x%08x for"
2437 " %u bytes of Immediate Data\n", checksum,
2438 length);
2439 }
2440 }
2441
2442 cmd->write_data_done += length;
2443
2444 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2445 spin_lock_bh(&cmd->istate_lock);
2446 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2447 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2448 spin_unlock_bh(&cmd->istate_lock);
2449 }
2450
2451 return IMMEDIATE_DATA_NORMAL_OPERATION;
2452 }
2453
2454 /*
2455 * Called with sess->conn_lock held.
2456 */
2457 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2458 with active network interface */
2459 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2460 {
2461 struct iscsi_cmd *cmd;
2462 struct iscsi_conn *conn_p;
2463
2464 /*
2465 * Only send a Asynchronous Message on connections whos network
2466 * interface is still functional.
2467 */
2468 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2469 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2470 iscsit_inc_conn_usage_count(conn_p);
2471 break;
2472 }
2473 }
2474
2475 if (!conn_p)
2476 return;
2477
2478 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
2479 if (!cmd) {
2480 iscsit_dec_conn_usage_count(conn_p);
2481 return;
2482 }
2483
2484 cmd->logout_cid = conn->cid;
2485 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2486 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2487
2488 spin_lock_bh(&conn_p->cmd_lock);
2489 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2490 spin_unlock_bh(&conn_p->cmd_lock);
2491
2492 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2493 iscsit_dec_conn_usage_count(conn_p);
2494 }
2495
2496 static int iscsit_send_conn_drop_async_message(
2497 struct iscsi_cmd *cmd,
2498 struct iscsi_conn *conn)
2499 {
2500 struct iscsi_async *hdr;
2501
2502 cmd->tx_size = ISCSI_HDR_LEN;
2503 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2504
2505 hdr = (struct iscsi_async *) cmd->pdu;
2506 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2507 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2508 cmd->init_task_tag = RESERVED_ITT;
2509 cmd->targ_xfer_tag = 0xFFFFFFFF;
2510 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2511 cmd->stat_sn = conn->stat_sn++;
2512 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2513 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2514 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2515 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2516 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2517 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2518 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2519
2520 if (conn->conn_ops->HeaderDigest) {
2521 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2522
2523 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2524 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2525
2526 cmd->tx_size += ISCSI_CRC_LEN;
2527 pr_debug("Attaching CRC32C HeaderDigest to"
2528 " Async Message 0x%08x\n", *header_digest);
2529 }
2530
2531 cmd->iov_misc[0].iov_base = cmd->pdu;
2532 cmd->iov_misc[0].iov_len = cmd->tx_size;
2533 cmd->iov_misc_count = 1;
2534
2535 pr_debug("Sending Connection Dropped Async Message StatSN:"
2536 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2537 cmd->logout_cid, conn->cid);
2538 return 0;
2539 }
2540
2541 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2542 {
2543 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2544 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2545 wait_for_completion_interruptible_timeout(
2546 &conn->tx_half_close_comp,
2547 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2548 }
2549 }
2550
2551 static void
2552 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2553 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2554 bool set_statsn)
2555 {
2556 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2557 hdr->flags = datain->flags;
2558 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2559 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2560 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2561 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2562 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2563 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2564 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2565 }
2566 }
2567 hton24(hdr->dlength, datain->length);
2568 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2569 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2570 (struct scsi_lun *)&hdr->lun);
2571 else
2572 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2573
2574 hdr->itt = cmd->init_task_tag;
2575
2576 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2577 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2578 else
2579 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2580 if (set_statsn)
2581 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2582 else
2583 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2584
2585 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2586 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2587 hdr->datasn = cpu_to_be32(datain->data_sn);
2588 hdr->offset = cpu_to_be32(datain->offset);
2589
2590 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2591 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2592 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2593 ntohl(hdr->offset), datain->length, conn->cid);
2594 }
2595
2596 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2597 {
2598 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2599 struct iscsi_datain datain;
2600 struct iscsi_datain_req *dr;
2601 struct kvec *iov;
2602 u32 iov_count = 0, tx_size = 0;
2603 int eodr = 0, ret, iov_ret;
2604 bool set_statsn = false;
2605
2606 memset(&datain, 0, sizeof(struct iscsi_datain));
2607 dr = iscsit_get_datain_values(cmd, &datain);
2608 if (!dr) {
2609 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2610 cmd->init_task_tag);
2611 return -1;
2612 }
2613 /*
2614 * Be paranoid and double check the logic for now.
2615 */
2616 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2617 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2618 " datain.length: %u exceeds cmd->data_length: %u\n",
2619 cmd->init_task_tag, datain.offset, datain.length,
2620 cmd->se_cmd.data_length);
2621 return -1;
2622 }
2623
2624 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2625 /*
2626 * Special case for successfully execution w/ both DATAIN
2627 * and Sense Data.
2628 */
2629 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2630 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2631 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2632 else {
2633 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2634 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2635 iscsit_increment_maxcmdsn(cmd, conn->sess);
2636 cmd->stat_sn = conn->stat_sn++;
2637 set_statsn = true;
2638 } else if (dr->dr_complete ==
2639 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2640 set_statsn = true;
2641 }
2642
2643 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2644
2645 iov = &cmd->iov_data[0];
2646 iov[iov_count].iov_base = cmd->pdu;
2647 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2648 tx_size += ISCSI_HDR_LEN;
2649
2650 if (conn->conn_ops->HeaderDigest) {
2651 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2652
2653 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2654 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2655
2656 iov[0].iov_len += ISCSI_CRC_LEN;
2657 tx_size += ISCSI_CRC_LEN;
2658
2659 pr_debug("Attaching CRC32 HeaderDigest"
2660 " for DataIN PDU 0x%08x\n", *header_digest);
2661 }
2662
2663 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2664 datain.offset, datain.length);
2665 if (iov_ret < 0)
2666 return -1;
2667
2668 iov_count += iov_ret;
2669 tx_size += datain.length;
2670
2671 cmd->padding = ((-datain.length) & 3);
2672 if (cmd->padding) {
2673 iov[iov_count].iov_base = cmd->pad_bytes;
2674 iov[iov_count++].iov_len = cmd->padding;
2675 tx_size += cmd->padding;
2676
2677 pr_debug("Attaching %u padding bytes\n",
2678 cmd->padding);
2679 }
2680 if (conn->conn_ops->DataDigest) {
2681 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2682 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2683
2684 iov[iov_count].iov_base = &cmd->data_crc;
2685 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2686 tx_size += ISCSI_CRC_LEN;
2687
2688 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2689 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2690 }
2691
2692 cmd->iov_data_count = iov_count;
2693 cmd->tx_size = tx_size;
2694
2695 /* sendpage is preferred but can't insert markers */
2696 if (!conn->conn_ops->IFMarker)
2697 ret = iscsit_fe_sendpage_sg(cmd, conn);
2698 else
2699 ret = iscsit_send_tx_data(cmd, conn, 0);
2700
2701 iscsit_unmap_iovec(cmd);
2702
2703 if (ret < 0) {
2704 iscsit_tx_thread_wait_for_tcp(conn);
2705 return ret;
2706 }
2707
2708 if (dr->dr_complete) {
2709 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2710 2 : 1;
2711 iscsit_free_datain_req(cmd, dr);
2712 }
2713
2714 return eodr;
2715 }
2716
2717 int
2718 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2719 struct iscsi_logout_rsp *hdr)
2720 {
2721 struct iscsi_conn *logout_conn = NULL;
2722 struct iscsi_conn_recovery *cr = NULL;
2723 struct iscsi_session *sess = conn->sess;
2724 /*
2725 * The actual shutting down of Sessions and/or Connections
2726 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2727 * is done in scsi_logout_post_handler().
2728 */
2729 switch (cmd->logout_reason) {
2730 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2731 pr_debug("iSCSI session logout successful, setting"
2732 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2733 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2734 break;
2735 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2736 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2737 break;
2738 /*
2739 * For CLOSECONNECTION logout requests carrying
2740 * a matching logout CID -> local CID, the reference
2741 * for the local CID will have been incremented in
2742 * iscsi_logout_closeconnection().
2743 *
2744 * For CLOSECONNECTION logout requests carrying
2745 * a different CID than the connection it arrived
2746 * on, the connection responding to cmd->logout_cid
2747 * is stopped in iscsit_logout_post_handler_diffcid().
2748 */
2749
2750 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2751 " successful.\n", cmd->logout_cid, conn->cid);
2752 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2753 break;
2754 case ISCSI_LOGOUT_REASON_RECOVERY:
2755 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2756 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2757 break;
2758 /*
2759 * If the connection is still active from our point of view
2760 * force connection recovery to occur.
2761 */
2762 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2763 cmd->logout_cid);
2764 if (logout_conn) {
2765 iscsit_connection_reinstatement_rcfr(logout_conn);
2766 iscsit_dec_conn_usage_count(logout_conn);
2767 }
2768
2769 cr = iscsit_get_inactive_connection_recovery_entry(
2770 conn->sess, cmd->logout_cid);
2771 if (!cr) {
2772 pr_err("Unable to locate CID: %hu for"
2773 " REMOVECONNFORRECOVERY Logout Request.\n",
2774 cmd->logout_cid);
2775 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2776 break;
2777 }
2778
2779 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2780
2781 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2782 " for recovery for CID: %hu on CID: %hu successful.\n",
2783 cmd->logout_cid, conn->cid);
2784 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2785 break;
2786 default:
2787 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2788 cmd->logout_reason);
2789 return -1;
2790 }
2791
2792 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2793 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2794 hdr->response = cmd->logout_response;
2795 hdr->itt = cmd->init_task_tag;
2796 cmd->stat_sn = conn->stat_sn++;
2797 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2798
2799 iscsit_increment_maxcmdsn(cmd, conn->sess);
2800 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2801 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2802
2803 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2804 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2805 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2806 cmd->logout_cid, conn->cid);
2807
2808 return 0;
2809 }
2810 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2811
2812 static int
2813 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2814 {
2815 struct kvec *iov;
2816 int niov = 0, tx_size, rc;
2817
2818 rc = iscsit_build_logout_rsp(cmd, conn,
2819 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2820 if (rc < 0)
2821 return rc;
2822
2823 tx_size = ISCSI_HDR_LEN;
2824 iov = &cmd->iov_misc[0];
2825 iov[niov].iov_base = cmd->pdu;
2826 iov[niov++].iov_len = ISCSI_HDR_LEN;
2827
2828 if (conn->conn_ops->HeaderDigest) {
2829 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2830
2831 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2832 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2833
2834 iov[0].iov_len += ISCSI_CRC_LEN;
2835 tx_size += ISCSI_CRC_LEN;
2836 pr_debug("Attaching CRC32C HeaderDigest to"
2837 " Logout Response 0x%08x\n", *header_digest);
2838 }
2839 cmd->iov_misc_count = niov;
2840 cmd->tx_size = tx_size;
2841
2842 return 0;
2843 }
2844
2845 void
2846 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2847 struct iscsi_nopin *hdr, bool nopout_response)
2848 {
2849 hdr->opcode = ISCSI_OP_NOOP_IN;
2850 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2851 hton24(hdr->dlength, cmd->buf_ptr_size);
2852 if (nopout_response)
2853 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2854 hdr->itt = cmd->init_task_tag;
2855 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2856 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2857 conn->stat_sn;
2858 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2859
2860 if (nopout_response)
2861 iscsit_increment_maxcmdsn(cmd, conn->sess);
2862
2863 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2864 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2865
2866 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2867 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2868 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2869 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2870 }
2871 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2872
2873 /*
2874 * Unsolicited NOPIN, either requesting a response or not.
2875 */
2876 static int iscsit_send_unsolicited_nopin(
2877 struct iscsi_cmd *cmd,
2878 struct iscsi_conn *conn,
2879 int want_response)
2880 {
2881 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2882 int tx_size = ISCSI_HDR_LEN, ret;
2883
2884 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2885
2886 if (conn->conn_ops->HeaderDigest) {
2887 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2888
2889 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2890 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2891
2892 tx_size += ISCSI_CRC_LEN;
2893 pr_debug("Attaching CRC32C HeaderDigest to"
2894 " NopIN 0x%08x\n", *header_digest);
2895 }
2896
2897 cmd->iov_misc[0].iov_base = cmd->pdu;
2898 cmd->iov_misc[0].iov_len = tx_size;
2899 cmd->iov_misc_count = 1;
2900 cmd->tx_size = tx_size;
2901
2902 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2903 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2904
2905 ret = iscsit_send_tx_data(cmd, conn, 1);
2906 if (ret < 0) {
2907 iscsit_tx_thread_wait_for_tcp(conn);
2908 return ret;
2909 }
2910
2911 spin_lock_bh(&cmd->istate_lock);
2912 cmd->i_state = want_response ?
2913 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2914 spin_unlock_bh(&cmd->istate_lock);
2915
2916 return 0;
2917 }
2918
2919 static int
2920 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2921 {
2922 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2923 struct kvec *iov;
2924 u32 padding = 0;
2925 int niov = 0, tx_size;
2926
2927 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2928
2929 tx_size = ISCSI_HDR_LEN;
2930 iov = &cmd->iov_misc[0];
2931 iov[niov].iov_base = cmd->pdu;
2932 iov[niov++].iov_len = ISCSI_HDR_LEN;
2933
2934 if (conn->conn_ops->HeaderDigest) {
2935 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2936
2937 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2938 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2939
2940 iov[0].iov_len += ISCSI_CRC_LEN;
2941 tx_size += ISCSI_CRC_LEN;
2942 pr_debug("Attaching CRC32C HeaderDigest"
2943 " to NopIn 0x%08x\n", *header_digest);
2944 }
2945
2946 /*
2947 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2948 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2949 */
2950 if (cmd->buf_ptr_size) {
2951 iov[niov].iov_base = cmd->buf_ptr;
2952 iov[niov++].iov_len = cmd->buf_ptr_size;
2953 tx_size += cmd->buf_ptr_size;
2954
2955 pr_debug("Echoing back %u bytes of ping"
2956 " data.\n", cmd->buf_ptr_size);
2957
2958 padding = ((-cmd->buf_ptr_size) & 3);
2959 if (padding != 0) {
2960 iov[niov].iov_base = &cmd->pad_bytes;
2961 iov[niov++].iov_len = padding;
2962 tx_size += padding;
2963 pr_debug("Attaching %u additional"
2964 " padding bytes.\n", padding);
2965 }
2966 if (conn->conn_ops->DataDigest) {
2967 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2968 cmd->buf_ptr, cmd->buf_ptr_size,
2969 padding, (u8 *)&cmd->pad_bytes,
2970 (u8 *)&cmd->data_crc);
2971
2972 iov[niov].iov_base = &cmd->data_crc;
2973 iov[niov++].iov_len = ISCSI_CRC_LEN;
2974 tx_size += ISCSI_CRC_LEN;
2975 pr_debug("Attached DataDigest for %u"
2976 " bytes of ping data, CRC 0x%08x\n",
2977 cmd->buf_ptr_size, cmd->data_crc);
2978 }
2979 }
2980
2981 cmd->iov_misc_count = niov;
2982 cmd->tx_size = tx_size;
2983
2984 return 0;
2985 }
2986
2987 static int iscsit_send_r2t(
2988 struct iscsi_cmd *cmd,
2989 struct iscsi_conn *conn)
2990 {
2991 int tx_size = 0;
2992 struct iscsi_r2t *r2t;
2993 struct iscsi_r2t_rsp *hdr;
2994 int ret;
2995
2996 r2t = iscsit_get_r2t_from_list(cmd);
2997 if (!r2t)
2998 return -1;
2999
3000 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3001 memset(hdr, 0, ISCSI_HDR_LEN);
3002 hdr->opcode = ISCSI_OP_R2T;
3003 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3004 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3005 (struct scsi_lun *)&hdr->lun);
3006 hdr->itt = cmd->init_task_tag;
3007 spin_lock_bh(&conn->sess->ttt_lock);
3008 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3009 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3010 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3011 spin_unlock_bh(&conn->sess->ttt_lock);
3012 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3013 hdr->statsn = cpu_to_be32(conn->stat_sn);
3014 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3015 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3016 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3017 hdr->data_offset = cpu_to_be32(r2t->offset);
3018 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3019
3020 cmd->iov_misc[0].iov_base = cmd->pdu;
3021 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3022 tx_size += ISCSI_HDR_LEN;
3023
3024 if (conn->conn_ops->HeaderDigest) {
3025 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3026
3027 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3028 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3029
3030 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3031 tx_size += ISCSI_CRC_LEN;
3032 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3033 " PDU 0x%08x\n", *header_digest);
3034 }
3035
3036 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3037 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3038 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3039 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3040 r2t->offset, r2t->xfer_len, conn->cid);
3041
3042 cmd->iov_misc_count = 1;
3043 cmd->tx_size = tx_size;
3044
3045 spin_lock_bh(&cmd->r2t_lock);
3046 r2t->sent_r2t = 1;
3047 spin_unlock_bh(&cmd->r2t_lock);
3048
3049 ret = iscsit_send_tx_data(cmd, conn, 1);
3050 if (ret < 0) {
3051 iscsit_tx_thread_wait_for_tcp(conn);
3052 return ret;
3053 }
3054
3055 spin_lock_bh(&cmd->dataout_timeout_lock);
3056 iscsit_start_dataout_timer(cmd, conn);
3057 spin_unlock_bh(&cmd->dataout_timeout_lock);
3058
3059 return 0;
3060 }
3061
3062 /*
3063 * @recovery: If called from iscsi_task_reassign_complete_write() for
3064 * connection recovery.
3065 */
3066 int iscsit_build_r2ts_for_cmd(
3067 struct iscsi_conn *conn,
3068 struct iscsi_cmd *cmd,
3069 bool recovery)
3070 {
3071 int first_r2t = 1;
3072 u32 offset = 0, xfer_len = 0;
3073
3074 spin_lock_bh(&cmd->r2t_lock);
3075 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3076 spin_unlock_bh(&cmd->r2t_lock);
3077 return 0;
3078 }
3079
3080 if (conn->sess->sess_ops->DataSequenceInOrder &&
3081 !recovery)
3082 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3083
3084 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3085 if (conn->sess->sess_ops->DataSequenceInOrder) {
3086 offset = cmd->r2t_offset;
3087
3088 if (first_r2t && recovery) {
3089 int new_data_end = offset +
3090 conn->sess->sess_ops->MaxBurstLength -
3091 cmd->next_burst_len;
3092
3093 if (new_data_end > cmd->se_cmd.data_length)
3094 xfer_len = cmd->se_cmd.data_length - offset;
3095 else
3096 xfer_len =
3097 conn->sess->sess_ops->MaxBurstLength -
3098 cmd->next_burst_len;
3099 } else {
3100 int new_data_end = offset +
3101 conn->sess->sess_ops->MaxBurstLength;
3102
3103 if (new_data_end > cmd->se_cmd.data_length)
3104 xfer_len = cmd->se_cmd.data_length - offset;
3105 else
3106 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3107 }
3108 cmd->r2t_offset += xfer_len;
3109
3110 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3111 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3112 } else {
3113 struct iscsi_seq *seq;
3114
3115 seq = iscsit_get_seq_holder_for_r2t(cmd);
3116 if (!seq) {
3117 spin_unlock_bh(&cmd->r2t_lock);
3118 return -1;
3119 }
3120
3121 offset = seq->offset;
3122 xfer_len = seq->xfer_len;
3123
3124 if (cmd->seq_send_order == cmd->seq_count)
3125 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3126 }
3127 cmd->outstanding_r2ts++;
3128 first_r2t = 0;
3129
3130 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3131 spin_unlock_bh(&cmd->r2t_lock);
3132 return -1;
3133 }
3134
3135 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3136 break;
3137 }
3138 spin_unlock_bh(&cmd->r2t_lock);
3139
3140 return 0;
3141 }
3142
3143 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3144 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3145 {
3146 if (inc_stat_sn)
3147 cmd->stat_sn = conn->stat_sn++;
3148
3149 atomic_long_inc(&conn->sess->rsp_pdus);
3150
3151 memset(hdr, 0, ISCSI_HDR_LEN);
3152 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3153 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3154 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3155 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3156 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3157 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3158 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3159 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3160 }
3161 hdr->response = cmd->iscsi_response;
3162 hdr->cmd_status = cmd->se_cmd.scsi_status;
3163 hdr->itt = cmd->init_task_tag;
3164 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3165
3166 iscsit_increment_maxcmdsn(cmd, conn->sess);
3167 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3168 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3169
3170 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3171 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3172 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3173 cmd->se_cmd.scsi_status, conn->cid);
3174 }
3175 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3176
3177 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3178 {
3179 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3180 struct kvec *iov;
3181 u32 padding = 0, tx_size = 0;
3182 int iov_count = 0;
3183 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3184
3185 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3186
3187 iov = &cmd->iov_misc[0];
3188 iov[iov_count].iov_base = cmd->pdu;
3189 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3190 tx_size += ISCSI_HDR_LEN;
3191
3192 /*
3193 * Attach SENSE DATA payload to iSCSI Response PDU
3194 */
3195 if (cmd->se_cmd.sense_buffer &&
3196 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3197 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3198 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3199 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3200
3201 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3202 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3203 iov[iov_count].iov_base = cmd->sense_buffer;
3204 iov[iov_count++].iov_len =
3205 (cmd->se_cmd.scsi_sense_length + padding);
3206 tx_size += cmd->se_cmd.scsi_sense_length;
3207
3208 if (padding) {
3209 memset(cmd->sense_buffer +
3210 cmd->se_cmd.scsi_sense_length, 0, padding);
3211 tx_size += padding;
3212 pr_debug("Adding %u bytes of padding to"
3213 " SENSE.\n", padding);
3214 }
3215
3216 if (conn->conn_ops->DataDigest) {
3217 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3218 cmd->sense_buffer,
3219 (cmd->se_cmd.scsi_sense_length + padding),
3220 0, NULL, (u8 *)&cmd->data_crc);
3221
3222 iov[iov_count].iov_base = &cmd->data_crc;
3223 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3224 tx_size += ISCSI_CRC_LEN;
3225
3226 pr_debug("Attaching CRC32 DataDigest for"
3227 " SENSE, %u bytes CRC 0x%08x\n",
3228 (cmd->se_cmd.scsi_sense_length + padding),
3229 cmd->data_crc);
3230 }
3231
3232 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3233 " Response PDU\n",
3234 cmd->se_cmd.scsi_sense_length);
3235 }
3236
3237 if (conn->conn_ops->HeaderDigest) {
3238 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3239
3240 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3241 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3242
3243 iov[0].iov_len += ISCSI_CRC_LEN;
3244 tx_size += ISCSI_CRC_LEN;
3245 pr_debug("Attaching CRC32 HeaderDigest for Response"
3246 " PDU 0x%08x\n", *header_digest);
3247 }
3248
3249 cmd->iov_misc_count = iov_count;
3250 cmd->tx_size = tx_size;
3251
3252 return 0;
3253 }
3254
3255 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3256 {
3257 switch (se_tmr->response) {
3258 case TMR_FUNCTION_COMPLETE:
3259 return ISCSI_TMF_RSP_COMPLETE;
3260 case TMR_TASK_DOES_NOT_EXIST:
3261 return ISCSI_TMF_RSP_NO_TASK;
3262 case TMR_LUN_DOES_NOT_EXIST:
3263 return ISCSI_TMF_RSP_NO_LUN;
3264 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3265 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3266 case TMR_FUNCTION_REJECTED:
3267 default:
3268 return ISCSI_TMF_RSP_REJECTED;
3269 }
3270 }
3271
3272 void
3273 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3274 struct iscsi_tm_rsp *hdr)
3275 {
3276 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3277
3278 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3279 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3280 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3281 hdr->itt = cmd->init_task_tag;
3282 cmd->stat_sn = conn->stat_sn++;
3283 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3284
3285 iscsit_increment_maxcmdsn(cmd, conn->sess);
3286 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3287 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3288
3289 pr_debug("Built Task Management Response ITT: 0x%08x,"
3290 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3291 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3292 }
3293 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3294
3295 static int
3296 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3297 {
3298 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3299 u32 tx_size = 0;
3300
3301 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3302
3303 cmd->iov_misc[0].iov_base = cmd->pdu;
3304 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3305 tx_size += ISCSI_HDR_LEN;
3306
3307 if (conn->conn_ops->HeaderDigest) {
3308 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3309
3310 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3311 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3312
3313 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3314 tx_size += ISCSI_CRC_LEN;
3315 pr_debug("Attaching CRC32 HeaderDigest for Task"
3316 " Mgmt Response PDU 0x%08x\n", *header_digest);
3317 }
3318
3319 cmd->iov_misc_count = 1;
3320 cmd->tx_size = tx_size;
3321
3322 return 0;
3323 }
3324
3325 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3326 {
3327 bool ret = false;
3328
3329 if (np->np_sockaddr.ss_family == AF_INET6) {
3330 const struct sockaddr_in6 sin6 = {
3331 .sin6_addr = IN6ADDR_ANY_INIT };
3332 struct sockaddr_in6 *sock_in6 =
3333 (struct sockaddr_in6 *)&np->np_sockaddr;
3334
3335 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3336 sin6.sin6_addr.s6_addr, 16))
3337 ret = true;
3338 } else {
3339 struct sockaddr_in * sock_in =
3340 (struct sockaddr_in *)&np->np_sockaddr;
3341
3342 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3343 ret = true;
3344 }
3345
3346 return ret;
3347 }
3348
3349 #define SENDTARGETS_BUF_LIMIT 32768U
3350
3351 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3352 {
3353 char *payload = NULL;
3354 struct iscsi_conn *conn = cmd->conn;
3355 struct iscsi_portal_group *tpg;
3356 struct iscsi_tiqn *tiqn;
3357 struct iscsi_tpg_np *tpg_np;
3358 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3359 int target_name_printed;
3360 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3361 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3362
3363 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3364 SENDTARGETS_BUF_LIMIT);
3365
3366 payload = kzalloc(buffer_len, GFP_KERNEL);
3367 if (!payload) {
3368 pr_err("Unable to allocate memory for sendtargets"
3369 " response.\n");
3370 return -ENOMEM;
3371 }
3372 /*
3373 * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
3374 * explicit case..
3375 */
3376 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
3377 text_ptr = strchr(text_in, '=');
3378 if (!text_ptr) {
3379 pr_err("Unable to locate '=' string in text_in:"
3380 " %s\n", text_in);
3381 kfree(payload);
3382 return -EINVAL;
3383 }
3384 /*
3385 * Skip over '=' character..
3386 */
3387 text_ptr += 1;
3388 }
3389
3390 spin_lock(&tiqn_lock);
3391 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3392 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
3393 strcmp(tiqn->tiqn, text_ptr)) {
3394 continue;
3395 }
3396
3397 target_name_printed = 0;
3398
3399 spin_lock(&tiqn->tiqn_tpg_lock);
3400 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3401
3402 /* If demo_mode_discovery=0 and generate_node_acls=0
3403 * (demo mode dislabed) do not return
3404 * TargetName+TargetAddress unless a NodeACL exists.
3405 */
3406
3407 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3408 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3409 (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3410 cmd->conn->sess->sess_ops->InitiatorName))) {
3411 continue;
3412 }
3413
3414 spin_lock(&tpg->tpg_state_lock);
3415 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3416 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3417 spin_unlock(&tpg->tpg_state_lock);
3418 continue;
3419 }
3420 spin_unlock(&tpg->tpg_state_lock);
3421
3422 spin_lock(&tpg->tpg_np_lock);
3423 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3424 tpg_np_list) {
3425 struct iscsi_np *np = tpg_np->tpg_np;
3426 bool inaddr_any = iscsit_check_inaddr_any(np);
3427
3428 if (!target_name_printed) {
3429 len = sprintf(buf, "TargetName=%s",
3430 tiqn->tiqn);
3431 len += 1;
3432
3433 if ((len + payload_len) > buffer_len) {
3434 spin_unlock(&tpg->tpg_np_lock);
3435 spin_unlock(&tiqn->tiqn_tpg_lock);
3436 end_of_buf = 1;
3437 goto eob;
3438 }
3439 memcpy(payload + payload_len, buf, len);
3440 payload_len += len;
3441 target_name_printed = 1;
3442 }
3443
3444 len = sprintf(buf, "TargetAddress="
3445 "%s:%hu,%hu",
3446 (inaddr_any == false) ?
3447 np->np_ip : conn->local_ip,
3448 (inaddr_any == false) ?
3449 np->np_port : conn->local_port,
3450 tpg->tpgt);
3451 len += 1;
3452
3453 if ((len + payload_len) > buffer_len) {
3454 spin_unlock(&tpg->tpg_np_lock);
3455 spin_unlock(&tiqn->tiqn_tpg_lock);
3456 end_of_buf = 1;
3457 goto eob;
3458 }
3459 memcpy(payload + payload_len, buf, len);
3460 payload_len += len;
3461 }
3462 spin_unlock(&tpg->tpg_np_lock);
3463 }
3464 spin_unlock(&tiqn->tiqn_tpg_lock);
3465 eob:
3466 if (end_of_buf)
3467 break;
3468
3469 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
3470 break;
3471 }
3472 spin_unlock(&tiqn_lock);
3473
3474 cmd->buf_ptr = payload;
3475
3476 return payload_len;
3477 }
3478
3479 int
3480 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3481 struct iscsi_text_rsp *hdr)
3482 {
3483 int text_length, padding;
3484
3485 text_length = iscsit_build_sendtargets_response(cmd);
3486 if (text_length < 0)
3487 return text_length;
3488
3489 hdr->opcode = ISCSI_OP_TEXT_RSP;
3490 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3491 padding = ((-text_length) & 3);
3492 hton24(hdr->dlength, text_length);
3493 hdr->itt = cmd->init_task_tag;
3494 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3495 cmd->stat_sn = conn->stat_sn++;
3496 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3497
3498 iscsit_increment_maxcmdsn(cmd, conn->sess);
3499 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3500 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3501
3502 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3503 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3504 text_length, conn->cid);
3505
3506 return text_length + padding;
3507 }
3508 EXPORT_SYMBOL(iscsit_build_text_rsp);
3509
3510 /*
3511 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3512 * MaxRecvDataSegmentLength.
3513 */
3514 static int iscsit_send_text_rsp(
3515 struct iscsi_cmd *cmd,
3516 struct iscsi_conn *conn)
3517 {
3518 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3519 struct kvec *iov;
3520 u32 tx_size = 0;
3521 int text_length, iov_count = 0, rc;
3522
3523 rc = iscsit_build_text_rsp(cmd, conn, hdr);
3524 if (rc < 0)
3525 return rc;
3526
3527 text_length = rc;
3528 iov = &cmd->iov_misc[0];
3529 iov[iov_count].iov_base = cmd->pdu;
3530 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3531 iov[iov_count].iov_base = cmd->buf_ptr;
3532 iov[iov_count++].iov_len = text_length;
3533
3534 tx_size += (ISCSI_HDR_LEN + text_length);
3535
3536 if (conn->conn_ops->HeaderDigest) {
3537 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3538
3539 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3540 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3541
3542 iov[0].iov_len += ISCSI_CRC_LEN;
3543 tx_size += ISCSI_CRC_LEN;
3544 pr_debug("Attaching CRC32 HeaderDigest for"
3545 " Text Response PDU 0x%08x\n", *header_digest);
3546 }
3547
3548 if (conn->conn_ops->DataDigest) {
3549 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3550 cmd->buf_ptr, text_length,
3551 0, NULL, (u8 *)&cmd->data_crc);
3552
3553 iov[iov_count].iov_base = &cmd->data_crc;
3554 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3555 tx_size += ISCSI_CRC_LEN;
3556
3557 pr_debug("Attaching DataDigest for %u bytes of text"
3558 " data, CRC 0x%08x\n", text_length,
3559 cmd->data_crc);
3560 }
3561
3562 cmd->iov_misc_count = iov_count;
3563 cmd->tx_size = tx_size;
3564
3565 return 0;
3566 }
3567
3568 void
3569 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3570 struct iscsi_reject *hdr)
3571 {
3572 hdr->opcode = ISCSI_OP_REJECT;
3573 hdr->reason = cmd->reject_reason;
3574 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3575 hton24(hdr->dlength, ISCSI_HDR_LEN);
3576 hdr->ffffffff = cpu_to_be32(0xffffffff);
3577 cmd->stat_sn = conn->stat_sn++;
3578 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3579 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3580 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3581
3582 }
3583 EXPORT_SYMBOL(iscsit_build_reject);
3584
3585 static int iscsit_send_reject(
3586 struct iscsi_cmd *cmd,
3587 struct iscsi_conn *conn)
3588 {
3589 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3590 struct kvec *iov;
3591 u32 iov_count = 0, tx_size;
3592
3593 iscsit_build_reject(cmd, conn, hdr);
3594
3595 iov = &cmd->iov_misc[0];
3596 iov[iov_count].iov_base = cmd->pdu;
3597 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3598 iov[iov_count].iov_base = cmd->buf_ptr;
3599 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3600
3601 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3602
3603 if (conn->conn_ops->HeaderDigest) {
3604 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3605
3606 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3607 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3608
3609 iov[0].iov_len += ISCSI_CRC_LEN;
3610 tx_size += ISCSI_CRC_LEN;
3611 pr_debug("Attaching CRC32 HeaderDigest for"
3612 " REJECT PDU 0x%08x\n", *header_digest);
3613 }
3614
3615 if (conn->conn_ops->DataDigest) {
3616 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3617 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3618
3619 iov[iov_count].iov_base = &cmd->data_crc;
3620 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3621 tx_size += ISCSI_CRC_LEN;
3622 pr_debug("Attaching CRC32 DataDigest for REJECT"
3623 " PDU 0x%08x\n", cmd->data_crc);
3624 }
3625
3626 cmd->iov_misc_count = iov_count;
3627 cmd->tx_size = tx_size;
3628
3629 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3630 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3631
3632 return 0;
3633 }
3634
3635 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3636 {
3637 struct iscsi_thread_set *ts = conn->thread_set;
3638 int ord, cpu;
3639 /*
3640 * thread_id is assigned from iscsit_global->ts_bitmap from
3641 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3642 *
3643 * Here we use thread_id to determine which CPU that this
3644 * iSCSI connection's iscsi_thread_set will be scheduled to
3645 * execute upon.
3646 */
3647 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3648 for_each_online_cpu(cpu) {
3649 if (ord-- == 0) {
3650 cpumask_set_cpu(cpu, conn->conn_cpumask);
3651 return;
3652 }
3653 }
3654 /*
3655 * This should never be reached..
3656 */
3657 dump_stack();
3658 cpumask_setall(conn->conn_cpumask);
3659 }
3660
3661 static inline void iscsit_thread_check_cpumask(
3662 struct iscsi_conn *conn,
3663 struct task_struct *p,
3664 int mode)
3665 {
3666 char buf[128];
3667 /*
3668 * mode == 1 signals iscsi_target_tx_thread() usage.
3669 * mode == 0 signals iscsi_target_rx_thread() usage.
3670 */
3671 if (mode == 1) {
3672 if (!conn->conn_tx_reset_cpumask)
3673 return;
3674 conn->conn_tx_reset_cpumask = 0;
3675 } else {
3676 if (!conn->conn_rx_reset_cpumask)
3677 return;
3678 conn->conn_rx_reset_cpumask = 0;
3679 }
3680 /*
3681 * Update the CPU mask for this single kthread so that
3682 * both TX and RX kthreads are scheduled to run on the
3683 * same CPU.
3684 */
3685 memset(buf, 0, 128);
3686 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3687 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3688 }
3689
3690 static int
3691 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3692 {
3693 int ret;
3694
3695 switch (state) {
3696 case ISTATE_SEND_R2T:
3697 ret = iscsit_send_r2t(cmd, conn);
3698 if (ret < 0)
3699 goto err;
3700 break;
3701 case ISTATE_REMOVE:
3702 spin_lock_bh(&conn->cmd_lock);
3703 list_del(&cmd->i_conn_node);
3704 spin_unlock_bh(&conn->cmd_lock);
3705
3706 iscsit_free_cmd(cmd, false);
3707 break;
3708 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3709 iscsit_mod_nopin_response_timer(conn);
3710 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3711 if (ret < 0)
3712 goto err;
3713 break;
3714 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3715 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3716 if (ret < 0)
3717 goto err;
3718 break;
3719 default:
3720 pr_err("Unknown Opcode: 0x%02x ITT:"
3721 " 0x%08x, i_state: %d on CID: %hu\n",
3722 cmd->iscsi_opcode, cmd->init_task_tag, state,
3723 conn->cid);
3724 goto err;
3725 }
3726
3727 return 0;
3728
3729 err:
3730 return -1;
3731 }
3732
3733 static int
3734 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3735 {
3736 struct iscsit_transport *t = conn->conn_transport;
3737 struct iscsi_queue_req *qr;
3738 struct iscsi_cmd *cmd;
3739 u8 state;
3740 int ret;
3741
3742 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3743 atomic_set(&conn->check_immediate_queue, 0);
3744 cmd = qr->cmd;
3745 state = qr->state;
3746 kmem_cache_free(lio_qr_cache, qr);
3747
3748 ret = t->iscsit_immediate_queue(conn, cmd, state);
3749 if (ret < 0)
3750 return ret;
3751 }
3752
3753 return 0;
3754 }
3755
3756 static int
3757 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3758 {
3759 int ret;
3760
3761 check_rsp_state:
3762 switch (state) {
3763 case ISTATE_SEND_DATAIN:
3764 ret = iscsit_send_datain(cmd, conn);
3765 if (ret < 0)
3766 goto err;
3767 else if (!ret)
3768 /* more drs */
3769 goto check_rsp_state;
3770 else if (ret == 1) {
3771 /* all done */
3772 spin_lock_bh(&cmd->istate_lock);
3773 cmd->i_state = ISTATE_SENT_STATUS;
3774 spin_unlock_bh(&cmd->istate_lock);
3775
3776 if (atomic_read(&conn->check_immediate_queue))
3777 return 1;
3778
3779 return 0;
3780 } else if (ret == 2) {
3781 /* Still must send status,
3782 SCF_TRANSPORT_TASK_SENSE was set */
3783 spin_lock_bh(&cmd->istate_lock);
3784 cmd->i_state = ISTATE_SEND_STATUS;
3785 spin_unlock_bh(&cmd->istate_lock);
3786 state = ISTATE_SEND_STATUS;
3787 goto check_rsp_state;
3788 }
3789
3790 break;
3791 case ISTATE_SEND_STATUS:
3792 case ISTATE_SEND_STATUS_RECOVERY:
3793 ret = iscsit_send_response(cmd, conn);
3794 break;
3795 case ISTATE_SEND_LOGOUTRSP:
3796 ret = iscsit_send_logout(cmd, conn);
3797 break;
3798 case ISTATE_SEND_ASYNCMSG:
3799 ret = iscsit_send_conn_drop_async_message(
3800 cmd, conn);
3801 break;
3802 case ISTATE_SEND_NOPIN:
3803 ret = iscsit_send_nopin(cmd, conn);
3804 break;
3805 case ISTATE_SEND_REJECT:
3806 ret = iscsit_send_reject(cmd, conn);
3807 break;
3808 case ISTATE_SEND_TASKMGTRSP:
3809 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3810 if (ret != 0)
3811 break;
3812 ret = iscsit_tmr_post_handler(cmd, conn);
3813 if (ret != 0)
3814 iscsit_fall_back_to_erl0(conn->sess);
3815 break;
3816 case ISTATE_SEND_TEXTRSP:
3817 ret = iscsit_send_text_rsp(cmd, conn);
3818 break;
3819 default:
3820 pr_err("Unknown Opcode: 0x%02x ITT:"
3821 " 0x%08x, i_state: %d on CID: %hu\n",
3822 cmd->iscsi_opcode, cmd->init_task_tag,
3823 state, conn->cid);
3824 goto err;
3825 }
3826 if (ret < 0)
3827 goto err;
3828
3829 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3830 iscsit_tx_thread_wait_for_tcp(conn);
3831 iscsit_unmap_iovec(cmd);
3832 goto err;
3833 }
3834 iscsit_unmap_iovec(cmd);
3835
3836 switch (state) {
3837 case ISTATE_SEND_LOGOUTRSP:
3838 if (!iscsit_logout_post_handler(cmd, conn))
3839 goto restart;
3840 /* fall through */
3841 case ISTATE_SEND_STATUS:
3842 case ISTATE_SEND_ASYNCMSG:
3843 case ISTATE_SEND_NOPIN:
3844 case ISTATE_SEND_STATUS_RECOVERY:
3845 case ISTATE_SEND_TEXTRSP:
3846 case ISTATE_SEND_TASKMGTRSP:
3847 case ISTATE_SEND_REJECT:
3848 spin_lock_bh(&cmd->istate_lock);
3849 cmd->i_state = ISTATE_SENT_STATUS;
3850 spin_unlock_bh(&cmd->istate_lock);
3851 break;
3852 default:
3853 pr_err("Unknown Opcode: 0x%02x ITT:"
3854 " 0x%08x, i_state: %d on CID: %hu\n",
3855 cmd->iscsi_opcode, cmd->init_task_tag,
3856 cmd->i_state, conn->cid);
3857 goto err;
3858 }
3859
3860 if (atomic_read(&conn->check_immediate_queue))
3861 return 1;
3862
3863 return 0;
3864
3865 err:
3866 return -1;
3867 restart:
3868 return -EAGAIN;
3869 }
3870
3871 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3872 {
3873 struct iscsit_transport *t = conn->conn_transport;
3874 struct iscsi_queue_req *qr;
3875 struct iscsi_cmd *cmd;
3876 u8 state;
3877 int ret;
3878
3879 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3880 cmd = qr->cmd;
3881 state = qr->state;
3882 kmem_cache_free(lio_qr_cache, qr);
3883
3884 ret = t->iscsit_response_queue(conn, cmd, state);
3885 if (ret == 1 || ret < 0)
3886 return ret;
3887 }
3888
3889 return 0;
3890 }
3891
3892 int iscsi_target_tx_thread(void *arg)
3893 {
3894 int ret = 0;
3895 struct iscsi_conn *conn;
3896 struct iscsi_thread_set *ts = arg;
3897 /*
3898 * Allow ourselves to be interrupted by SIGINT so that a
3899 * connection recovery / failure event can be triggered externally.
3900 */
3901 allow_signal(SIGINT);
3902
3903 restart:
3904 conn = iscsi_tx_thread_pre_handler(ts);
3905 if (!conn)
3906 goto out;
3907
3908 ret = 0;
3909
3910 while (!kthread_should_stop()) {
3911 /*
3912 * Ensure that both TX and RX per connection kthreads
3913 * are scheduled to run on the same CPU.
3914 */
3915 iscsit_thread_check_cpumask(conn, current, 1);
3916
3917 wait_event_interruptible(conn->queues_wq,
3918 !iscsit_conn_all_queues_empty(conn) ||
3919 ts->status == ISCSI_THREAD_SET_RESET);
3920
3921 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3922 signal_pending(current))
3923 goto transport_err;
3924
3925 get_immediate:
3926 ret = iscsit_handle_immediate_queue(conn);
3927 if (ret < 0)
3928 goto transport_err;
3929
3930 ret = iscsit_handle_response_queue(conn);
3931 if (ret == 1)
3932 goto get_immediate;
3933 else if (ret == -EAGAIN)
3934 goto restart;
3935 else if (ret < 0)
3936 goto transport_err;
3937 }
3938
3939 transport_err:
3940 iscsit_take_action_for_connection_exit(conn);
3941 goto restart;
3942 out:
3943 return 0;
3944 }
3945
3946 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3947 {
3948 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3949 struct iscsi_cmd *cmd;
3950 int ret = 0;
3951
3952 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3953 case ISCSI_OP_SCSI_CMD:
3954 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3955 if (!cmd)
3956 goto reject;
3957
3958 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3959 break;
3960 case ISCSI_OP_SCSI_DATA_OUT:
3961 ret = iscsit_handle_data_out(conn, buf);
3962 break;
3963 case ISCSI_OP_NOOP_OUT:
3964 cmd = NULL;
3965 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3966 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3967 if (!cmd)
3968 goto reject;
3969 }
3970 ret = iscsit_handle_nop_out(conn, cmd, buf);
3971 break;
3972 case ISCSI_OP_SCSI_TMFUNC:
3973 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3974 if (!cmd)
3975 goto reject;
3976
3977 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3978 break;
3979 case ISCSI_OP_TEXT:
3980 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3981 if (!cmd)
3982 goto reject;
3983
3984 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3985 break;
3986 case ISCSI_OP_LOGOUT:
3987 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3988 if (!cmd)
3989 goto reject;
3990
3991 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3992 if (ret > 0)
3993 wait_for_completion_timeout(&conn->conn_logout_comp,
3994 SECONDS_FOR_LOGOUT_COMP * HZ);
3995 break;
3996 case ISCSI_OP_SNACK:
3997 ret = iscsit_handle_snack(conn, buf);
3998 break;
3999 default:
4000 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4001 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4002 pr_err("Cannot recover from unknown"
4003 " opcode while ERL=0, closing iSCSI connection.\n");
4004 return -1;
4005 }
4006 if (!conn->conn_ops->OFMarker) {
4007 pr_err("Unable to recover from unknown"
4008 " opcode while OFMarker=No, closing iSCSI"
4009 " connection.\n");
4010 return -1;
4011 }
4012 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4013 pr_err("Unable to recover from unknown"
4014 " opcode, closing iSCSI connection.\n");
4015 return -1;
4016 }
4017 break;
4018 }
4019
4020 return ret;
4021 reject:
4022 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4023 }
4024
4025 int iscsi_target_rx_thread(void *arg)
4026 {
4027 int ret;
4028 u8 buffer[ISCSI_HDR_LEN], opcode;
4029 u32 checksum = 0, digest = 0;
4030 struct iscsi_conn *conn = NULL;
4031 struct iscsi_thread_set *ts = arg;
4032 struct kvec iov;
4033 /*
4034 * Allow ourselves to be interrupted by SIGINT so that a
4035 * connection recovery / failure event can be triggered externally.
4036 */
4037 allow_signal(SIGINT);
4038
4039 restart:
4040 conn = iscsi_rx_thread_pre_handler(ts);
4041 if (!conn)
4042 goto out;
4043
4044 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4045 struct completion comp;
4046 int rc;
4047
4048 init_completion(&comp);
4049 rc = wait_for_completion_interruptible(&comp);
4050 if (rc < 0)
4051 goto transport_err;
4052
4053 goto out;
4054 }
4055
4056 while (!kthread_should_stop()) {
4057 /*
4058 * Ensure that both TX and RX per connection kthreads
4059 * are scheduled to run on the same CPU.
4060 */
4061 iscsit_thread_check_cpumask(conn, current, 0);
4062
4063 memset(buffer, 0, ISCSI_HDR_LEN);
4064 memset(&iov, 0, sizeof(struct kvec));
4065
4066 iov.iov_base = buffer;
4067 iov.iov_len = ISCSI_HDR_LEN;
4068
4069 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4070 if (ret != ISCSI_HDR_LEN) {
4071 iscsit_rx_thread_wait_for_tcp(conn);
4072 goto transport_err;
4073 }
4074
4075 if (conn->conn_ops->HeaderDigest) {
4076 iov.iov_base = &digest;
4077 iov.iov_len = ISCSI_CRC_LEN;
4078
4079 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4080 if (ret != ISCSI_CRC_LEN) {
4081 iscsit_rx_thread_wait_for_tcp(conn);
4082 goto transport_err;
4083 }
4084
4085 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4086 buffer, ISCSI_HDR_LEN,
4087 0, NULL, (u8 *)&checksum);
4088
4089 if (digest != checksum) {
4090 pr_err("HeaderDigest CRC32C failed,"
4091 " received 0x%08x, computed 0x%08x\n",
4092 digest, checksum);
4093 /*
4094 * Set the PDU to 0xff so it will intentionally
4095 * hit default in the switch below.
4096 */
4097 memset(buffer, 0xff, ISCSI_HDR_LEN);
4098 atomic_long_inc(&conn->sess->conn_digest_errors);
4099 } else {
4100 pr_debug("Got HeaderDigest CRC32C"
4101 " 0x%08x\n", checksum);
4102 }
4103 }
4104
4105 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4106 goto transport_err;
4107
4108 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4109
4110 if (conn->sess->sess_ops->SessionType &&
4111 ((!(opcode & ISCSI_OP_TEXT)) ||
4112 (!(opcode & ISCSI_OP_LOGOUT)))) {
4113 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4114 " while in Discovery Session, rejecting.\n", opcode);
4115 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4116 buffer);
4117 goto transport_err;
4118 }
4119
4120 ret = iscsi_target_rx_opcode(conn, buffer);
4121 if (ret < 0)
4122 goto transport_err;
4123 }
4124
4125 transport_err:
4126 if (!signal_pending(current))
4127 atomic_set(&conn->transport_failed, 1);
4128 iscsit_take_action_for_connection_exit(conn);
4129 goto restart;
4130 out:
4131 return 0;
4132 }
4133
4134 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4135 {
4136 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4137 struct iscsi_session *sess = conn->sess;
4138 /*
4139 * We expect this function to only ever be called from either RX or TX
4140 * thread context via iscsit_close_connection() once the other context
4141 * has been reset -> returned sleeping pre-handler state.
4142 */
4143 spin_lock_bh(&conn->cmd_lock);
4144 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4145
4146 list_del(&cmd->i_conn_node);
4147 spin_unlock_bh(&conn->cmd_lock);
4148
4149 iscsit_increment_maxcmdsn(cmd, sess);
4150
4151 iscsit_free_cmd(cmd, true);
4152
4153 spin_lock_bh(&conn->cmd_lock);
4154 }
4155 spin_unlock_bh(&conn->cmd_lock);
4156 }
4157
4158 static void iscsit_stop_timers_for_cmds(
4159 struct iscsi_conn *conn)
4160 {
4161 struct iscsi_cmd *cmd;
4162
4163 spin_lock_bh(&conn->cmd_lock);
4164 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4165 if (cmd->data_direction == DMA_TO_DEVICE)
4166 iscsit_stop_dataout_timer(cmd);
4167 }
4168 spin_unlock_bh(&conn->cmd_lock);
4169 }
4170
4171 int iscsit_close_connection(
4172 struct iscsi_conn *conn)
4173 {
4174 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4175 struct iscsi_session *sess = conn->sess;
4176
4177 pr_debug("Closing iSCSI connection CID %hu on SID:"
4178 " %u\n", conn->cid, sess->sid);
4179 /*
4180 * Always up conn_logout_comp just in case the RX Thread is sleeping
4181 * and the logout response never got sent because the connection
4182 * failed.
4183 */
4184 complete(&conn->conn_logout_comp);
4185
4186 iscsi_release_thread_set(conn);
4187
4188 iscsit_stop_timers_for_cmds(conn);
4189 iscsit_stop_nopin_response_timer(conn);
4190 iscsit_stop_nopin_timer(conn);
4191 iscsit_free_queue_reqs_for_conn(conn);
4192
4193 /*
4194 * During Connection recovery drop unacknowledged out of order
4195 * commands for this connection, and prepare the other commands
4196 * for realligence.
4197 *
4198 * During normal operation clear the out of order commands (but
4199 * do not free the struct iscsi_ooo_cmdsn's) and release all
4200 * struct iscsi_cmds.
4201 */
4202 if (atomic_read(&conn->connection_recovery)) {
4203 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4204 iscsit_prepare_cmds_for_realligance(conn);
4205 } else {
4206 iscsit_clear_ooo_cmdsns_for_conn(conn);
4207 iscsit_release_commands_from_conn(conn);
4208 }
4209
4210 /*
4211 * Handle decrementing session or connection usage count if
4212 * a logout response was not able to be sent because the
4213 * connection failed. Fall back to Session Recovery here.
4214 */
4215 if (atomic_read(&conn->conn_logout_remove)) {
4216 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4217 iscsit_dec_conn_usage_count(conn);
4218 iscsit_dec_session_usage_count(sess);
4219 }
4220 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4221 iscsit_dec_conn_usage_count(conn);
4222
4223 atomic_set(&conn->conn_logout_remove, 0);
4224 atomic_set(&sess->session_reinstatement, 0);
4225 atomic_set(&sess->session_fall_back_to_erl0, 1);
4226 }
4227
4228 spin_lock_bh(&sess->conn_lock);
4229 list_del(&conn->conn_list);
4230
4231 /*
4232 * Attempt to let the Initiator know this connection failed by
4233 * sending an Connection Dropped Async Message on another
4234 * active connection.
4235 */
4236 if (atomic_read(&conn->connection_recovery))
4237 iscsit_build_conn_drop_async_message(conn);
4238
4239 spin_unlock_bh(&sess->conn_lock);
4240
4241 /*
4242 * If connection reinstatement is being performed on this connection,
4243 * up the connection reinstatement semaphore that is being blocked on
4244 * in iscsit_cause_connection_reinstatement().
4245 */
4246 spin_lock_bh(&conn->state_lock);
4247 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4248 spin_unlock_bh(&conn->state_lock);
4249 complete(&conn->conn_wait_comp);
4250 wait_for_completion(&conn->conn_post_wait_comp);
4251 spin_lock_bh(&conn->state_lock);
4252 }
4253
4254 /*
4255 * If connection reinstatement is being performed on this connection
4256 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4257 * connection wait rcfr semaphore that is being blocked on
4258 * an iscsit_connection_reinstatement_rcfr().
4259 */
4260 if (atomic_read(&conn->connection_wait_rcfr)) {
4261 spin_unlock_bh(&conn->state_lock);
4262 complete(&conn->conn_wait_rcfr_comp);
4263 wait_for_completion(&conn->conn_post_wait_comp);
4264 spin_lock_bh(&conn->state_lock);
4265 }
4266 atomic_set(&conn->connection_reinstatement, 1);
4267 spin_unlock_bh(&conn->state_lock);
4268
4269 /*
4270 * If any other processes are accessing this connection pointer we
4271 * must wait until they have completed.
4272 */
4273 iscsit_check_conn_usage_count(conn);
4274
4275 if (conn->conn_rx_hash.tfm)
4276 crypto_free_hash(conn->conn_rx_hash.tfm);
4277 if (conn->conn_tx_hash.tfm)
4278 crypto_free_hash(conn->conn_tx_hash.tfm);
4279
4280 if (conn->conn_cpumask)
4281 free_cpumask_var(conn->conn_cpumask);
4282
4283 kfree(conn->conn_ops);
4284 conn->conn_ops = NULL;
4285
4286 if (conn->sock)
4287 sock_release(conn->sock);
4288
4289 if (conn->conn_transport->iscsit_free_conn)
4290 conn->conn_transport->iscsit_free_conn(conn);
4291
4292 iscsit_put_transport(conn->conn_transport);
4293
4294 conn->thread_set = NULL;
4295
4296 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4297 conn->conn_state = TARG_CONN_STATE_FREE;
4298 kfree(conn);
4299
4300 spin_lock_bh(&sess->conn_lock);
4301 atomic_dec(&sess->nconn);
4302 pr_debug("Decremented iSCSI connection count to %hu from node:"
4303 " %s\n", atomic_read(&sess->nconn),
4304 sess->sess_ops->InitiatorName);
4305 /*
4306 * Make sure that if one connection fails in an non ERL=2 iSCSI
4307 * Session that they all fail.
4308 */
4309 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4310 !atomic_read(&sess->session_logout))
4311 atomic_set(&sess->session_fall_back_to_erl0, 1);
4312
4313 /*
4314 * If this was not the last connection in the session, and we are
4315 * performing session reinstatement or falling back to ERL=0, call
4316 * iscsit_stop_session() without sleeping to shutdown the other
4317 * active connections.
4318 */
4319 if (atomic_read(&sess->nconn)) {
4320 if (!atomic_read(&sess->session_reinstatement) &&
4321 !atomic_read(&sess->session_fall_back_to_erl0)) {
4322 spin_unlock_bh(&sess->conn_lock);
4323 return 0;
4324 }
4325 if (!atomic_read(&sess->session_stop_active)) {
4326 atomic_set(&sess->session_stop_active, 1);
4327 spin_unlock_bh(&sess->conn_lock);
4328 iscsit_stop_session(sess, 0, 0);
4329 return 0;
4330 }
4331 spin_unlock_bh(&sess->conn_lock);
4332 return 0;
4333 }
4334
4335 /*
4336 * If this was the last connection in the session and one of the
4337 * following is occurring:
4338 *
4339 * Session Reinstatement is not being performed, and are falling back
4340 * to ERL=0 call iscsit_close_session().
4341 *
4342 * Session Logout was requested. iscsit_close_session() will be called
4343 * elsewhere.
4344 *
4345 * Session Continuation is not being performed, start the Time2Retain
4346 * handler and check if sleep_on_sess_wait_sem is active.
4347 */
4348 if (!atomic_read(&sess->session_reinstatement) &&
4349 atomic_read(&sess->session_fall_back_to_erl0)) {
4350 spin_unlock_bh(&sess->conn_lock);
4351 target_put_session(sess->se_sess);
4352
4353 return 0;
4354 } else if (atomic_read(&sess->session_logout)) {
4355 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4356 sess->session_state = TARG_SESS_STATE_FREE;
4357 spin_unlock_bh(&sess->conn_lock);
4358
4359 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4360 complete(&sess->session_wait_comp);
4361
4362 return 0;
4363 } else {
4364 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4365 sess->session_state = TARG_SESS_STATE_FAILED;
4366
4367 if (!atomic_read(&sess->session_continuation)) {
4368 spin_unlock_bh(&sess->conn_lock);
4369 iscsit_start_time2retain_handler(sess);
4370 } else
4371 spin_unlock_bh(&sess->conn_lock);
4372
4373 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4374 complete(&sess->session_wait_comp);
4375
4376 return 0;
4377 }
4378 spin_unlock_bh(&sess->conn_lock);
4379
4380 return 0;
4381 }
4382
4383 int iscsit_close_session(struct iscsi_session *sess)
4384 {
4385 struct iscsi_portal_group *tpg = sess->tpg;
4386 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4387
4388 if (atomic_read(&sess->nconn)) {
4389 pr_err("%d connection(s) still exist for iSCSI session"
4390 " to %s\n", atomic_read(&sess->nconn),
4391 sess->sess_ops->InitiatorName);
4392 BUG();
4393 }
4394
4395 spin_lock_bh(&se_tpg->session_lock);
4396 atomic_set(&sess->session_logout, 1);
4397 atomic_set(&sess->session_reinstatement, 1);
4398 iscsit_stop_time2retain_timer(sess);
4399 spin_unlock_bh(&se_tpg->session_lock);
4400
4401 /*
4402 * transport_deregister_session_configfs() will clear the
4403 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4404 * can be setting it again with __transport_register_session() in
4405 * iscsi_post_login_handler() again after the iscsit_stop_session()
4406 * completes in iscsi_np context.
4407 */
4408 transport_deregister_session_configfs(sess->se_sess);
4409
4410 /*
4411 * If any other processes are accessing this session pointer we must
4412 * wait until they have completed. If we are in an interrupt (the
4413 * time2retain handler) and contain and active session usage count we
4414 * restart the timer and exit.
4415 */
4416 if (!in_interrupt()) {
4417 if (iscsit_check_session_usage_count(sess) == 1)
4418 iscsit_stop_session(sess, 1, 1);
4419 } else {
4420 if (iscsit_check_session_usage_count(sess) == 2) {
4421 atomic_set(&sess->session_logout, 0);
4422 iscsit_start_time2retain_handler(sess);
4423 return 0;
4424 }
4425 }
4426
4427 transport_deregister_session(sess->se_sess);
4428
4429 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4430 iscsit_free_connection_recovery_entires(sess);
4431
4432 iscsit_free_all_ooo_cmdsns(sess);
4433
4434 spin_lock_bh(&se_tpg->session_lock);
4435 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4436 sess->session_state = TARG_SESS_STATE_FREE;
4437 pr_debug("Released iSCSI session from node: %s\n",
4438 sess->sess_ops->InitiatorName);
4439 tpg->nsessions--;
4440 if (tpg->tpg_tiqn)
4441 tpg->tpg_tiqn->tiqn_nsessions--;
4442
4443 pr_debug("Decremented number of active iSCSI Sessions on"
4444 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4445
4446 spin_lock(&sess_idr_lock);
4447 idr_remove(&sess_idr, sess->session_index);
4448 spin_unlock(&sess_idr_lock);
4449
4450 kfree(sess->sess_ops);
4451 sess->sess_ops = NULL;
4452 spin_unlock_bh(&se_tpg->session_lock);
4453
4454 kfree(sess);
4455 return 0;
4456 }
4457
4458 static void iscsit_logout_post_handler_closesession(
4459 struct iscsi_conn *conn)
4460 {
4461 struct iscsi_session *sess = conn->sess;
4462
4463 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4464 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4465
4466 atomic_set(&conn->conn_logout_remove, 0);
4467 complete(&conn->conn_logout_comp);
4468
4469 iscsit_dec_conn_usage_count(conn);
4470 iscsit_stop_session(sess, 1, 1);
4471 iscsit_dec_session_usage_count(sess);
4472 target_put_session(sess->se_sess);
4473 }
4474
4475 static void iscsit_logout_post_handler_samecid(
4476 struct iscsi_conn *conn)
4477 {
4478 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4479 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4480
4481 atomic_set(&conn->conn_logout_remove, 0);
4482 complete(&conn->conn_logout_comp);
4483
4484 iscsit_cause_connection_reinstatement(conn, 1);
4485 iscsit_dec_conn_usage_count(conn);
4486 }
4487
4488 static void iscsit_logout_post_handler_diffcid(
4489 struct iscsi_conn *conn,
4490 u16 cid)
4491 {
4492 struct iscsi_conn *l_conn;
4493 struct iscsi_session *sess = conn->sess;
4494
4495 if (!sess)
4496 return;
4497
4498 spin_lock_bh(&sess->conn_lock);
4499 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4500 if (l_conn->cid == cid) {
4501 iscsit_inc_conn_usage_count(l_conn);
4502 break;
4503 }
4504 }
4505 spin_unlock_bh(&sess->conn_lock);
4506
4507 if (!l_conn)
4508 return;
4509
4510 if (l_conn->sock)
4511 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4512
4513 spin_lock_bh(&l_conn->state_lock);
4514 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4515 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4516 spin_unlock_bh(&l_conn->state_lock);
4517
4518 iscsit_cause_connection_reinstatement(l_conn, 1);
4519 iscsit_dec_conn_usage_count(l_conn);
4520 }
4521
4522 /*
4523 * Return of 0 causes the TX thread to restart.
4524 */
4525 int iscsit_logout_post_handler(
4526 struct iscsi_cmd *cmd,
4527 struct iscsi_conn *conn)
4528 {
4529 int ret = 0;
4530
4531 switch (cmd->logout_reason) {
4532 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4533 switch (cmd->logout_response) {
4534 case ISCSI_LOGOUT_SUCCESS:
4535 case ISCSI_LOGOUT_CLEANUP_FAILED:
4536 default:
4537 iscsit_logout_post_handler_closesession(conn);
4538 break;
4539 }
4540 ret = 0;
4541 break;
4542 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4543 if (conn->cid == cmd->logout_cid) {
4544 switch (cmd->logout_response) {
4545 case ISCSI_LOGOUT_SUCCESS:
4546 case ISCSI_LOGOUT_CLEANUP_FAILED:
4547 default:
4548 iscsit_logout_post_handler_samecid(conn);
4549 break;
4550 }
4551 ret = 0;
4552 } else {
4553 switch (cmd->logout_response) {
4554 case ISCSI_LOGOUT_SUCCESS:
4555 iscsit_logout_post_handler_diffcid(conn,
4556 cmd->logout_cid);
4557 break;
4558 case ISCSI_LOGOUT_CID_NOT_FOUND:
4559 case ISCSI_LOGOUT_CLEANUP_FAILED:
4560 default:
4561 break;
4562 }
4563 ret = 1;
4564 }
4565 break;
4566 case ISCSI_LOGOUT_REASON_RECOVERY:
4567 switch (cmd->logout_response) {
4568 case ISCSI_LOGOUT_SUCCESS:
4569 case ISCSI_LOGOUT_CID_NOT_FOUND:
4570 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4571 case ISCSI_LOGOUT_CLEANUP_FAILED:
4572 default:
4573 break;
4574 }
4575 ret = 1;
4576 break;
4577 default:
4578 break;
4579
4580 }
4581 return ret;
4582 }
4583 EXPORT_SYMBOL(iscsit_logout_post_handler);
4584
4585 void iscsit_fail_session(struct iscsi_session *sess)
4586 {
4587 struct iscsi_conn *conn;
4588
4589 spin_lock_bh(&sess->conn_lock);
4590 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4591 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4592 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4593 }
4594 spin_unlock_bh(&sess->conn_lock);
4595
4596 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4597 sess->session_state = TARG_SESS_STATE_FAILED;
4598 }
4599
4600 int iscsit_free_session(struct iscsi_session *sess)
4601 {
4602 u16 conn_count = atomic_read(&sess->nconn);
4603 struct iscsi_conn *conn, *conn_tmp = NULL;
4604 int is_last;
4605
4606 spin_lock_bh(&sess->conn_lock);
4607 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4608
4609 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4610 conn_list) {
4611 if (conn_count == 0)
4612 break;
4613
4614 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4615 is_last = 1;
4616 } else {
4617 iscsit_inc_conn_usage_count(conn_tmp);
4618 is_last = 0;
4619 }
4620 iscsit_inc_conn_usage_count(conn);
4621
4622 spin_unlock_bh(&sess->conn_lock);
4623 iscsit_cause_connection_reinstatement(conn, 1);
4624 spin_lock_bh(&sess->conn_lock);
4625
4626 iscsit_dec_conn_usage_count(conn);
4627 if (is_last == 0)
4628 iscsit_dec_conn_usage_count(conn_tmp);
4629
4630 conn_count--;
4631 }
4632
4633 if (atomic_read(&sess->nconn)) {
4634 spin_unlock_bh(&sess->conn_lock);
4635 wait_for_completion(&sess->session_wait_comp);
4636 } else
4637 spin_unlock_bh(&sess->conn_lock);
4638
4639 target_put_session(sess->se_sess);
4640 return 0;
4641 }
4642
4643 void iscsit_stop_session(
4644 struct iscsi_session *sess,
4645 int session_sleep,
4646 int connection_sleep)
4647 {
4648 u16 conn_count = atomic_read(&sess->nconn);
4649 struct iscsi_conn *conn, *conn_tmp = NULL;
4650 int is_last;
4651
4652 spin_lock_bh(&sess->conn_lock);
4653 if (session_sleep)
4654 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4655
4656 if (connection_sleep) {
4657 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4658 conn_list) {
4659 if (conn_count == 0)
4660 break;
4661
4662 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4663 is_last = 1;
4664 } else {
4665 iscsit_inc_conn_usage_count(conn_tmp);
4666 is_last = 0;
4667 }
4668 iscsit_inc_conn_usage_count(conn);
4669
4670 spin_unlock_bh(&sess->conn_lock);
4671 iscsit_cause_connection_reinstatement(conn, 1);
4672 spin_lock_bh(&sess->conn_lock);
4673
4674 iscsit_dec_conn_usage_count(conn);
4675 if (is_last == 0)
4676 iscsit_dec_conn_usage_count(conn_tmp);
4677 conn_count--;
4678 }
4679 } else {
4680 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4681 iscsit_cause_connection_reinstatement(conn, 0);
4682 }
4683
4684 if (session_sleep && atomic_read(&sess->nconn)) {
4685 spin_unlock_bh(&sess->conn_lock);
4686 wait_for_completion(&sess->session_wait_comp);
4687 } else
4688 spin_unlock_bh(&sess->conn_lock);
4689 }
4690
4691 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4692 {
4693 struct iscsi_session *sess;
4694 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4695 struct se_session *se_sess, *se_sess_tmp;
4696 int session_count = 0;
4697
4698 spin_lock_bh(&se_tpg->session_lock);
4699 if (tpg->nsessions && !force) {
4700 spin_unlock_bh(&se_tpg->session_lock);
4701 return -1;
4702 }
4703
4704 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4705 sess_list) {
4706 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4707
4708 spin_lock(&sess->conn_lock);
4709 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4710 atomic_read(&sess->session_logout) ||
4711 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4712 spin_unlock(&sess->conn_lock);
4713 continue;
4714 }
4715 atomic_set(&sess->session_reinstatement, 1);
4716 spin_unlock(&sess->conn_lock);
4717 spin_unlock_bh(&se_tpg->session_lock);
4718
4719 iscsit_free_session(sess);
4720 spin_lock_bh(&se_tpg->session_lock);
4721
4722 session_count++;
4723 }
4724 spin_unlock_bh(&se_tpg->session_lock);
4725
4726 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4727 " Group: %hu\n", session_count, tpg->tpgt);
4728 return 0;
4729 }
4730
4731 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4732 MODULE_VERSION("4.1.x");
4733 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4734 MODULE_LICENSE("GPL");
4735
4736 module_init(iscsi_target_init_module);
4737 module_exit(iscsi_target_cleanup_module);
Linux kernel - Deliverables
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