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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target...
[mirror_ubuntu-zesty-kernel.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/vmalloc.h>
25 #include <linux/idr.h>
26 #include <asm/unaligned.h>
27 #include <scsi/scsi_proto.h>
28 #include <scsi/iscsi_proto.h>
29 #include <scsi/scsi_tcq.h>
30 #include <target/target_core_base.h>
31 #include <target/target_core_fabric.h>
32
33 #include <target/iscsi/iscsi_target_core.h>
34 #include "iscsi_target_parameters.h"
35 #include "iscsi_target_seq_pdu_list.h"
36 #include "iscsi_target_datain_values.h"
37 #include "iscsi_target_erl0.h"
38 #include "iscsi_target_erl1.h"
39 #include "iscsi_target_erl2.h"
40 #include "iscsi_target_login.h"
41 #include "iscsi_target_tmr.h"
42 #include "iscsi_target_tpg.h"
43 #include "iscsi_target_util.h"
44 #include "iscsi_target.h"
45 #include "iscsi_target_device.h"
46 #include <target/iscsi/iscsi_target_stat.h>
47
48 #include <target/iscsi/iscsi_transport.h>
49
50 static LIST_HEAD(g_tiqn_list);
51 static LIST_HEAD(g_np_list);
52 static DEFINE_SPINLOCK(tiqn_lock);
53 static DEFINE_MUTEX(np_lock);
54
55 static struct idr tiqn_idr;
56 struct idr sess_idr;
57 struct mutex auth_id_lock;
58 spinlock_t sess_idr_lock;
59
60 struct iscsit_global *iscsit_global;
61
62 struct kmem_cache *lio_qr_cache;
63 struct kmem_cache *lio_dr_cache;
64 struct kmem_cache *lio_ooo_cache;
65 struct kmem_cache *lio_r2t_cache;
66
67 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
68 struct iscsi_scsi_req *, u32);
69
70 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
71 {
72 struct iscsi_tiqn *tiqn = NULL;
73
74 spin_lock(&tiqn_lock);
75 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
76 if (!strcmp(tiqn->tiqn, buf)) {
77
78 spin_lock(&tiqn->tiqn_state_lock);
79 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
80 tiqn->tiqn_access_count++;
81 spin_unlock(&tiqn->tiqn_state_lock);
82 spin_unlock(&tiqn_lock);
83 return tiqn;
84 }
85 spin_unlock(&tiqn->tiqn_state_lock);
86 }
87 }
88 spin_unlock(&tiqn_lock);
89
90 return NULL;
91 }
92
93 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
94 {
95 spin_lock(&tiqn->tiqn_state_lock);
96 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
97 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
98 spin_unlock(&tiqn->tiqn_state_lock);
99 return 0;
100 }
101 spin_unlock(&tiqn->tiqn_state_lock);
102
103 return -1;
104 }
105
106 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
107 {
108 spin_lock(&tiqn->tiqn_state_lock);
109 tiqn->tiqn_access_count--;
110 spin_unlock(&tiqn->tiqn_state_lock);
111 }
112
113 /*
114 * Note that IQN formatting is expected to be done in userspace, and
115 * no explict IQN format checks are done here.
116 */
117 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
118 {
119 struct iscsi_tiqn *tiqn = NULL;
120 int ret;
121
122 if (strlen(buf) >= ISCSI_IQN_LEN) {
123 pr_err("Target IQN exceeds %d bytes\n",
124 ISCSI_IQN_LEN);
125 return ERR_PTR(-EINVAL);
126 }
127
128 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
129 if (!tiqn) {
130 pr_err("Unable to allocate struct iscsi_tiqn\n");
131 return ERR_PTR(-ENOMEM);
132 }
133
134 sprintf(tiqn->tiqn, "%s", buf);
135 INIT_LIST_HEAD(&tiqn->tiqn_list);
136 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
137 spin_lock_init(&tiqn->tiqn_state_lock);
138 spin_lock_init(&tiqn->tiqn_tpg_lock);
139 spin_lock_init(&tiqn->sess_err_stats.lock);
140 spin_lock_init(&tiqn->login_stats.lock);
141 spin_lock_init(&tiqn->logout_stats.lock);
142
143 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
144
145 idr_preload(GFP_KERNEL);
146 spin_lock(&tiqn_lock);
147
148 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
149 if (ret < 0) {
150 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
151 spin_unlock(&tiqn_lock);
152 idr_preload_end();
153 kfree(tiqn);
154 return ERR_PTR(ret);
155 }
156 tiqn->tiqn_index = ret;
157 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
158
159 spin_unlock(&tiqn_lock);
160 idr_preload_end();
161
162 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
163
164 return tiqn;
165
166 }
167
168 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
169 {
170 /*
171 * Wait for accesses to said struct iscsi_tiqn to end.
172 */
173 spin_lock(&tiqn->tiqn_state_lock);
174 while (tiqn->tiqn_access_count != 0) {
175 spin_unlock(&tiqn->tiqn_state_lock);
176 msleep(10);
177 spin_lock(&tiqn->tiqn_state_lock);
178 }
179 spin_unlock(&tiqn->tiqn_state_lock);
180 }
181
182 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
183 {
184 /*
185 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
186 * while holding tiqn->tiqn_state_lock. This means that all subsequent
187 * attempts to access this struct iscsi_tiqn will fail from both transport
188 * fabric and control code paths.
189 */
190 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
191 pr_err("iscsit_set_tiqn_shutdown() failed\n");
192 return;
193 }
194
195 iscsit_wait_for_tiqn(tiqn);
196
197 spin_lock(&tiqn_lock);
198 list_del(&tiqn->tiqn_list);
199 idr_remove(&tiqn_idr, tiqn->tiqn_index);
200 spin_unlock(&tiqn_lock);
201
202 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
203 tiqn->tiqn);
204 kfree(tiqn);
205 }
206
207 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
208 {
209 int ret;
210 /*
211 * Determine if the network portal is accepting storage traffic.
212 */
213 spin_lock_bh(&np->np_thread_lock);
214 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
215 spin_unlock_bh(&np->np_thread_lock);
216 return -1;
217 }
218 spin_unlock_bh(&np->np_thread_lock);
219 /*
220 * Determine if the portal group is accepting storage traffic.
221 */
222 spin_lock_bh(&tpg->tpg_state_lock);
223 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
224 spin_unlock_bh(&tpg->tpg_state_lock);
225 return -1;
226 }
227 spin_unlock_bh(&tpg->tpg_state_lock);
228
229 /*
230 * Here we serialize access across the TIQN+TPG Tuple.
231 */
232 ret = down_interruptible(&tpg->np_login_sem);
233 if (ret != 0)
234 return -1;
235
236 spin_lock_bh(&tpg->tpg_state_lock);
237 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
238 spin_unlock_bh(&tpg->tpg_state_lock);
239 up(&tpg->np_login_sem);
240 return -1;
241 }
242 spin_unlock_bh(&tpg->tpg_state_lock);
243
244 return 0;
245 }
246
247 void iscsit_login_kref_put(struct kref *kref)
248 {
249 struct iscsi_tpg_np *tpg_np = container_of(kref,
250 struct iscsi_tpg_np, tpg_np_kref);
251
252 complete(&tpg_np->tpg_np_comp);
253 }
254
255 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
256 struct iscsi_tpg_np *tpg_np)
257 {
258 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
259
260 up(&tpg->np_login_sem);
261
262 if (tpg_np)
263 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
264
265 if (tiqn)
266 iscsit_put_tiqn_for_login(tiqn);
267
268 return 0;
269 }
270
271 bool iscsit_check_np_match(
272 struct sockaddr_storage *sockaddr,
273 struct iscsi_np *np,
274 int network_transport)
275 {
276 struct sockaddr_in *sock_in, *sock_in_e;
277 struct sockaddr_in6 *sock_in6, *sock_in6_e;
278 bool ip_match = false;
279 u16 port, port_e;
280
281 if (sockaddr->ss_family == AF_INET6) {
282 sock_in6 = (struct sockaddr_in6 *)sockaddr;
283 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
284
285 if (!memcmp(&sock_in6->sin6_addr.in6_u,
286 &sock_in6_e->sin6_addr.in6_u,
287 sizeof(struct in6_addr)))
288 ip_match = true;
289
290 port = ntohs(sock_in6->sin6_port);
291 port_e = ntohs(sock_in6_e->sin6_port);
292 } else {
293 sock_in = (struct sockaddr_in *)sockaddr;
294 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
295
296 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
297 ip_match = true;
298
299 port = ntohs(sock_in->sin_port);
300 port_e = ntohs(sock_in_e->sin_port);
301 }
302
303 if (ip_match && (port_e == port) &&
304 (np->np_network_transport == network_transport))
305 return true;
306
307 return false;
308 }
309
310 /*
311 * Called with mutex np_lock held
312 */
313 static struct iscsi_np *iscsit_get_np(
314 struct sockaddr_storage *sockaddr,
315 int network_transport)
316 {
317 struct iscsi_np *np;
318 bool match;
319
320 list_for_each_entry(np, &g_np_list, np_list) {
321 spin_lock_bh(&np->np_thread_lock);
322 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
323 spin_unlock_bh(&np->np_thread_lock);
324 continue;
325 }
326
327 match = iscsit_check_np_match(sockaddr, np, network_transport);
328 if (match) {
329 /*
330 * Increment the np_exports reference count now to
331 * prevent iscsit_del_np() below from being called
332 * while iscsi_tpg_add_network_portal() is called.
333 */
334 np->np_exports++;
335 spin_unlock_bh(&np->np_thread_lock);
336 return np;
337 }
338 spin_unlock_bh(&np->np_thread_lock);
339 }
340
341 return NULL;
342 }
343
344 struct iscsi_np *iscsit_add_np(
345 struct sockaddr_storage *sockaddr,
346 int network_transport)
347 {
348 struct iscsi_np *np;
349 int ret;
350
351 mutex_lock(&np_lock);
352
353 /*
354 * Locate the existing struct iscsi_np if already active..
355 */
356 np = iscsit_get_np(sockaddr, network_transport);
357 if (np) {
358 mutex_unlock(&np_lock);
359 return np;
360 }
361
362 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
363 if (!np) {
364 pr_err("Unable to allocate memory for struct iscsi_np\n");
365 mutex_unlock(&np_lock);
366 return ERR_PTR(-ENOMEM);
367 }
368
369 np->np_flags |= NPF_IP_NETWORK;
370 np->np_network_transport = network_transport;
371 spin_lock_init(&np->np_thread_lock);
372 init_completion(&np->np_restart_comp);
373 INIT_LIST_HEAD(&np->np_list);
374
375 ret = iscsi_target_setup_login_socket(np, sockaddr);
376 if (ret != 0) {
377 kfree(np);
378 mutex_unlock(&np_lock);
379 return ERR_PTR(ret);
380 }
381
382 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
383 if (IS_ERR(np->np_thread)) {
384 pr_err("Unable to create kthread: iscsi_np\n");
385 ret = PTR_ERR(np->np_thread);
386 kfree(np);
387 mutex_unlock(&np_lock);
388 return ERR_PTR(ret);
389 }
390 /*
391 * Increment the np_exports reference count now to prevent
392 * iscsit_del_np() below from being run while a new call to
393 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
394 * active. We don't need to hold np->np_thread_lock at this
395 * point because iscsi_np has not been added to g_np_list yet.
396 */
397 np->np_exports = 1;
398 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
399
400 list_add_tail(&np->np_list, &g_np_list);
401 mutex_unlock(&np_lock);
402
403 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
404 &np->np_sockaddr, np->np_transport->name);
405
406 return np;
407 }
408
409 int iscsit_reset_np_thread(
410 struct iscsi_np *np,
411 struct iscsi_tpg_np *tpg_np,
412 struct iscsi_portal_group *tpg,
413 bool shutdown)
414 {
415 spin_lock_bh(&np->np_thread_lock);
416 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
417 spin_unlock_bh(&np->np_thread_lock);
418 return 0;
419 }
420 np->np_thread_state = ISCSI_NP_THREAD_RESET;
421
422 if (np->np_thread) {
423 spin_unlock_bh(&np->np_thread_lock);
424 send_sig(SIGINT, np->np_thread, 1);
425 wait_for_completion(&np->np_restart_comp);
426 spin_lock_bh(&np->np_thread_lock);
427 }
428 spin_unlock_bh(&np->np_thread_lock);
429
430 if (tpg_np && shutdown) {
431 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
432
433 wait_for_completion(&tpg_np->tpg_np_comp);
434 }
435
436 return 0;
437 }
438
439 static void iscsit_free_np(struct iscsi_np *np)
440 {
441 if (np->np_socket)
442 sock_release(np->np_socket);
443 }
444
445 int iscsit_del_np(struct iscsi_np *np)
446 {
447 spin_lock_bh(&np->np_thread_lock);
448 np->np_exports--;
449 if (np->np_exports) {
450 np->enabled = true;
451 spin_unlock_bh(&np->np_thread_lock);
452 return 0;
453 }
454 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
455 spin_unlock_bh(&np->np_thread_lock);
456
457 if (np->np_thread) {
458 /*
459 * We need to send the signal to wakeup Linux/Net
460 * which may be sleeping in sock_accept()..
461 */
462 send_sig(SIGINT, np->np_thread, 1);
463 kthread_stop(np->np_thread);
464 np->np_thread = NULL;
465 }
466
467 np->np_transport->iscsit_free_np(np);
468
469 mutex_lock(&np_lock);
470 list_del(&np->np_list);
471 mutex_unlock(&np_lock);
472
473 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
474 &np->np_sockaddr, np->np_transport->name);
475
476 iscsit_put_transport(np->np_transport);
477 kfree(np);
478 return 0;
479 }
480
481 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
482 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
483
484 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
485 {
486 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
487 return 0;
488 }
489
490 static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
491 {
492 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
493
494 spin_lock_bh(&conn->cmd_lock);
495 if (!list_empty(&cmd->i_conn_node))
496 list_del_init(&cmd->i_conn_node);
497 spin_unlock_bh(&conn->cmd_lock);
498
499 __iscsit_free_cmd(cmd, scsi_cmd, true);
500 }
501
502 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
503 {
504 return TARGET_PROT_NORMAL;
505 }
506
507 static struct iscsit_transport iscsi_target_transport = {
508 .name = "iSCSI/TCP",
509 .transport_type = ISCSI_TCP,
510 .owner = NULL,
511 .iscsit_setup_np = iscsit_setup_np,
512 .iscsit_accept_np = iscsit_accept_np,
513 .iscsit_free_np = iscsit_free_np,
514 .iscsit_get_login_rx = iscsit_get_login_rx,
515 .iscsit_put_login_tx = iscsit_put_login_tx,
516 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
517 .iscsit_immediate_queue = iscsit_immediate_queue,
518 .iscsit_response_queue = iscsit_response_queue,
519 .iscsit_queue_data_in = iscsit_queue_rsp,
520 .iscsit_queue_status = iscsit_queue_rsp,
521 .iscsit_aborted_task = iscsit_aborted_task,
522 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
523 };
524
525 static int __init iscsi_target_init_module(void)
526 {
527 int ret = 0, size;
528
529 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
530
531 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
532 if (!iscsit_global) {
533 pr_err("Unable to allocate memory for iscsit_global\n");
534 return -1;
535 }
536 spin_lock_init(&iscsit_global->ts_bitmap_lock);
537 mutex_init(&auth_id_lock);
538 spin_lock_init(&sess_idr_lock);
539 idr_init(&tiqn_idr);
540 idr_init(&sess_idr);
541
542 ret = target_register_template(&iscsi_ops);
543 if (ret)
544 goto out;
545
546 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
547 iscsit_global->ts_bitmap = vzalloc(size);
548 if (!iscsit_global->ts_bitmap) {
549 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
550 goto configfs_out;
551 }
552
553 lio_qr_cache = kmem_cache_create("lio_qr_cache",
554 sizeof(struct iscsi_queue_req),
555 __alignof__(struct iscsi_queue_req), 0, NULL);
556 if (!lio_qr_cache) {
557 pr_err("nable to kmem_cache_create() for"
558 " lio_qr_cache\n");
559 goto bitmap_out;
560 }
561
562 lio_dr_cache = kmem_cache_create("lio_dr_cache",
563 sizeof(struct iscsi_datain_req),
564 __alignof__(struct iscsi_datain_req), 0, NULL);
565 if (!lio_dr_cache) {
566 pr_err("Unable to kmem_cache_create() for"
567 " lio_dr_cache\n");
568 goto qr_out;
569 }
570
571 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
572 sizeof(struct iscsi_ooo_cmdsn),
573 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
574 if (!lio_ooo_cache) {
575 pr_err("Unable to kmem_cache_create() for"
576 " lio_ooo_cache\n");
577 goto dr_out;
578 }
579
580 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
581 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
582 0, NULL);
583 if (!lio_r2t_cache) {
584 pr_err("Unable to kmem_cache_create() for"
585 " lio_r2t_cache\n");
586 goto ooo_out;
587 }
588
589 iscsit_register_transport(&iscsi_target_transport);
590
591 if (iscsit_load_discovery_tpg() < 0)
592 goto r2t_out;
593
594 return ret;
595 r2t_out:
596 iscsit_unregister_transport(&iscsi_target_transport);
597 kmem_cache_destroy(lio_r2t_cache);
598 ooo_out:
599 kmem_cache_destroy(lio_ooo_cache);
600 dr_out:
601 kmem_cache_destroy(lio_dr_cache);
602 qr_out:
603 kmem_cache_destroy(lio_qr_cache);
604 bitmap_out:
605 vfree(iscsit_global->ts_bitmap);
606 configfs_out:
607 /* XXX: this probably wants it to be it's own unwind step.. */
608 if (iscsit_global->discovery_tpg)
609 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
610 target_unregister_template(&iscsi_ops);
611 out:
612 kfree(iscsit_global);
613 return -ENOMEM;
614 }
615
616 static void __exit iscsi_target_cleanup_module(void)
617 {
618 iscsit_release_discovery_tpg();
619 iscsit_unregister_transport(&iscsi_target_transport);
620 kmem_cache_destroy(lio_qr_cache);
621 kmem_cache_destroy(lio_dr_cache);
622 kmem_cache_destroy(lio_ooo_cache);
623 kmem_cache_destroy(lio_r2t_cache);
624
625 /*
626 * Shutdown discovery sessions and disable discovery TPG
627 */
628 if (iscsit_global->discovery_tpg)
629 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
630
631 target_unregister_template(&iscsi_ops);
632
633 vfree(iscsit_global->ts_bitmap);
634 kfree(iscsit_global);
635 }
636
637 static int iscsit_add_reject(
638 struct iscsi_conn *conn,
639 u8 reason,
640 unsigned char *buf)
641 {
642 struct iscsi_cmd *cmd;
643
644 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
645 if (!cmd)
646 return -1;
647
648 cmd->iscsi_opcode = ISCSI_OP_REJECT;
649 cmd->reject_reason = reason;
650
651 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
652 if (!cmd->buf_ptr) {
653 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
654 iscsit_free_cmd(cmd, false);
655 return -1;
656 }
657
658 spin_lock_bh(&conn->cmd_lock);
659 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
660 spin_unlock_bh(&conn->cmd_lock);
661
662 cmd->i_state = ISTATE_SEND_REJECT;
663 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
664
665 return -1;
666 }
667
668 static int iscsit_add_reject_from_cmd(
669 struct iscsi_cmd *cmd,
670 u8 reason,
671 bool add_to_conn,
672 unsigned char *buf)
673 {
674 struct iscsi_conn *conn;
675
676 if (!cmd->conn) {
677 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
678 cmd->init_task_tag);
679 return -1;
680 }
681 conn = cmd->conn;
682
683 cmd->iscsi_opcode = ISCSI_OP_REJECT;
684 cmd->reject_reason = reason;
685
686 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
687 if (!cmd->buf_ptr) {
688 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
689 iscsit_free_cmd(cmd, false);
690 return -1;
691 }
692
693 if (add_to_conn) {
694 spin_lock_bh(&conn->cmd_lock);
695 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
696 spin_unlock_bh(&conn->cmd_lock);
697 }
698
699 cmd->i_state = ISTATE_SEND_REJECT;
700 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
701 /*
702 * Perform the kref_put now if se_cmd has already been setup by
703 * scsit_setup_scsi_cmd()
704 */
705 if (cmd->se_cmd.se_tfo != NULL) {
706 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
707 target_put_sess_cmd(&cmd->se_cmd);
708 }
709 return -1;
710 }
711
712 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
713 unsigned char *buf)
714 {
715 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
716 }
717
718 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
719 {
720 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
721 }
722
723 /*
724 * Map some portion of the allocated scatterlist to an iovec, suitable for
725 * kernel sockets to copy data in/out.
726 */
727 static int iscsit_map_iovec(
728 struct iscsi_cmd *cmd,
729 struct kvec *iov,
730 u32 data_offset,
731 u32 data_length)
732 {
733 u32 i = 0;
734 struct scatterlist *sg;
735 unsigned int page_off;
736
737 /*
738 * We know each entry in t_data_sg contains a page.
739 */
740 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
741 page_off = (data_offset % PAGE_SIZE);
742
743 cmd->first_data_sg = sg;
744 cmd->first_data_sg_off = page_off;
745
746 while (data_length) {
747 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
748
749 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
750 iov[i].iov_len = cur_len;
751
752 data_length -= cur_len;
753 page_off = 0;
754 sg = sg_next(sg);
755 i++;
756 }
757
758 cmd->kmapped_nents = i;
759
760 return i;
761 }
762
763 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
764 {
765 u32 i;
766 struct scatterlist *sg;
767
768 sg = cmd->first_data_sg;
769
770 for (i = 0; i < cmd->kmapped_nents; i++)
771 kunmap(sg_page(&sg[i]));
772 }
773
774 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
775 {
776 LIST_HEAD(ack_list);
777 struct iscsi_cmd *cmd, *cmd_p;
778
779 conn->exp_statsn = exp_statsn;
780
781 if (conn->sess->sess_ops->RDMAExtensions)
782 return;
783
784 spin_lock_bh(&conn->cmd_lock);
785 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
786 spin_lock(&cmd->istate_lock);
787 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
788 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
789 cmd->i_state = ISTATE_REMOVE;
790 spin_unlock(&cmd->istate_lock);
791 list_move_tail(&cmd->i_conn_node, &ack_list);
792 continue;
793 }
794 spin_unlock(&cmd->istate_lock);
795 }
796 spin_unlock_bh(&conn->cmd_lock);
797
798 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
799 list_del_init(&cmd->i_conn_node);
800 iscsit_free_cmd(cmd, false);
801 }
802 }
803
804 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
805 {
806 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
807
808 iov_count += ISCSI_IOV_DATA_BUFFER;
809
810 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
811 if (!cmd->iov_data) {
812 pr_err("Unable to allocate cmd->iov_data\n");
813 return -ENOMEM;
814 }
815
816 cmd->orig_iov_data_count = iov_count;
817 return 0;
818 }
819
820 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
821 unsigned char *buf)
822 {
823 int data_direction, payload_length;
824 struct iscsi_scsi_req *hdr;
825 int iscsi_task_attr;
826 int sam_task_attr;
827
828 atomic_long_inc(&conn->sess->cmd_pdus);
829
830 hdr = (struct iscsi_scsi_req *) buf;
831 payload_length = ntoh24(hdr->dlength);
832
833 /* FIXME; Add checks for AdditionalHeaderSegment */
834
835 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
836 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
837 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
838 " not set. Bad iSCSI Initiator.\n");
839 return iscsit_add_reject_cmd(cmd,
840 ISCSI_REASON_BOOKMARK_INVALID, buf);
841 }
842
843 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
844 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
845 /*
846 * From RFC-3720 Section 10.3.1:
847 *
848 * "Either or both of R and W MAY be 1 when either the
849 * Expected Data Transfer Length and/or Bidirectional Read
850 * Expected Data Transfer Length are 0"
851 *
852 * For this case, go ahead and clear the unnecssary bits
853 * to avoid any confusion with ->data_direction.
854 */
855 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
856 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
857
858 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
859 " set when Expected Data Transfer Length is 0 for"
860 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
861 }
862
863 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
864 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
865 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
866 " MUST be set if Expected Data Transfer Length is not 0."
867 " Bad iSCSI Initiator\n");
868 return iscsit_add_reject_cmd(cmd,
869 ISCSI_REASON_BOOKMARK_INVALID, buf);
870 }
871
872 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
873 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
874 pr_err("Bidirectional operations not supported!\n");
875 return iscsit_add_reject_cmd(cmd,
876 ISCSI_REASON_BOOKMARK_INVALID, buf);
877 }
878
879 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
880 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
881 " Scsi Command PDU.\n");
882 return iscsit_add_reject_cmd(cmd,
883 ISCSI_REASON_BOOKMARK_INVALID, buf);
884 }
885
886 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
887 pr_err("ImmediateData=No but DataSegmentLength=%u,"
888 " protocol error.\n", payload_length);
889 return iscsit_add_reject_cmd(cmd,
890 ISCSI_REASON_PROTOCOL_ERROR, buf);
891 }
892
893 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
894 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
895 pr_err("Expected Data Transfer Length and Length of"
896 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
897 " bit is not set protocol error\n");
898 return iscsit_add_reject_cmd(cmd,
899 ISCSI_REASON_PROTOCOL_ERROR, buf);
900 }
901
902 if (payload_length > be32_to_cpu(hdr->data_length)) {
903 pr_err("DataSegmentLength: %u is greater than"
904 " EDTL: %u, protocol error.\n", payload_length,
905 hdr->data_length);
906 return iscsit_add_reject_cmd(cmd,
907 ISCSI_REASON_PROTOCOL_ERROR, buf);
908 }
909
910 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
911 pr_err("DataSegmentLength: %u is greater than"
912 " MaxXmitDataSegmentLength: %u, protocol error.\n",
913 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
914 return iscsit_add_reject_cmd(cmd,
915 ISCSI_REASON_PROTOCOL_ERROR, buf);
916 }
917
918 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
919 pr_err("DataSegmentLength: %u is greater than"
920 " FirstBurstLength: %u, protocol error.\n",
921 payload_length, conn->sess->sess_ops->FirstBurstLength);
922 return iscsit_add_reject_cmd(cmd,
923 ISCSI_REASON_BOOKMARK_INVALID, buf);
924 }
925
926 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
927 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
928 DMA_NONE;
929
930 cmd->data_direction = data_direction;
931 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
932 /*
933 * Figure out the SAM Task Attribute for the incoming SCSI CDB
934 */
935 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
936 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
937 sam_task_attr = TCM_SIMPLE_TAG;
938 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
939 sam_task_attr = TCM_ORDERED_TAG;
940 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
941 sam_task_attr = TCM_HEAD_TAG;
942 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
943 sam_task_attr = TCM_ACA_TAG;
944 else {
945 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
946 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
947 sam_task_attr = TCM_SIMPLE_TAG;
948 }
949
950 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
951 cmd->i_state = ISTATE_NEW_CMD;
952 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
953 cmd->immediate_data = (payload_length) ? 1 : 0;
954 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
955 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
956 if (cmd->unsolicited_data)
957 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
958
959 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
960 if (hdr->flags & ISCSI_FLAG_CMD_READ)
961 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
962 else
963 cmd->targ_xfer_tag = 0xFFFFFFFF;
964 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
965 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
966 cmd->first_burst_len = payload_length;
967
968 if (!conn->sess->sess_ops->RDMAExtensions &&
969 cmd->data_direction == DMA_FROM_DEVICE) {
970 struct iscsi_datain_req *dr;
971
972 dr = iscsit_allocate_datain_req();
973 if (!dr)
974 return iscsit_add_reject_cmd(cmd,
975 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
976
977 iscsit_attach_datain_req(cmd, dr);
978 }
979
980 /*
981 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
982 */
983 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
984 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
985 cmd->data_direction, sam_task_attr,
986 cmd->sense_buffer + 2);
987
988 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
989 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
990 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
991 conn->cid);
992
993 target_get_sess_cmd(&cmd->se_cmd, true);
994
995 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
996 scsilun_to_int(&hdr->lun));
997 if (cmd->sense_reason)
998 goto attach_cmd;
999
1000 /* only used for printks or comparing with ->ref_task_tag */
1001 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1002 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1003 if (cmd->sense_reason) {
1004 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1005 return iscsit_add_reject_cmd(cmd,
1006 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1007 }
1008
1009 goto attach_cmd;
1010 }
1011
1012 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1013 return iscsit_add_reject_cmd(cmd,
1014 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1015 }
1016
1017 attach_cmd:
1018 spin_lock_bh(&conn->cmd_lock);
1019 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1020 spin_unlock_bh(&conn->cmd_lock);
1021 /*
1022 * Check if we need to delay processing because of ALUA
1023 * Active/NonOptimized primary access state..
1024 */
1025 core_alua_check_nonop_delay(&cmd->se_cmd);
1026
1027 return 0;
1028 }
1029 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1030
1031 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1032 {
1033 iscsit_set_dataout_sequence_values(cmd);
1034
1035 spin_lock_bh(&cmd->dataout_timeout_lock);
1036 iscsit_start_dataout_timer(cmd, cmd->conn);
1037 spin_unlock_bh(&cmd->dataout_timeout_lock);
1038 }
1039 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1040
1041 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1042 struct iscsi_scsi_req *hdr)
1043 {
1044 int cmdsn_ret = 0;
1045 /*
1046 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1047 * the Immediate Bit is not set, and no Immediate
1048 * Data is attached.
1049 *
1050 * A PDU/CmdSN carrying Immediate Data can only
1051 * be processed after the DataCRC has passed.
1052 * If the DataCRC fails, the CmdSN MUST NOT
1053 * be acknowledged. (See below)
1054 */
1055 if (!cmd->immediate_data) {
1056 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1057 (unsigned char *)hdr, hdr->cmdsn);
1058 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1059 return -1;
1060 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1061 target_put_sess_cmd(&cmd->se_cmd);
1062 return 0;
1063 }
1064 }
1065
1066 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1067
1068 /*
1069 * If no Immediate Data is attached, it's OK to return now.
1070 */
1071 if (!cmd->immediate_data) {
1072 if (!cmd->sense_reason && cmd->unsolicited_data)
1073 iscsit_set_unsoliticed_dataout(cmd);
1074 if (!cmd->sense_reason)
1075 return 0;
1076
1077 target_put_sess_cmd(&cmd->se_cmd);
1078 return 0;
1079 }
1080
1081 /*
1082 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1083 * execution. These exceptions are processed in CmdSN order using
1084 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1085 */
1086 if (cmd->sense_reason) {
1087 if (cmd->reject_reason)
1088 return 0;
1089
1090 return 1;
1091 }
1092 /*
1093 * Call directly into transport_generic_new_cmd() to perform
1094 * the backend memory allocation.
1095 */
1096 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1097 if (cmd->sense_reason)
1098 return 1;
1099
1100 return 0;
1101 }
1102 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1103
1104 static int
1105 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1106 bool dump_payload)
1107 {
1108 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1109 /*
1110 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1111 */
1112 if (dump_payload)
1113 goto after_immediate_data;
1114
1115 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1116 cmd->first_burst_len);
1117 after_immediate_data:
1118 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1119 /*
1120 * A PDU/CmdSN carrying Immediate Data passed
1121 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1122 * Immediate Bit is not set.
1123 */
1124 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1125 (unsigned char *)hdr, hdr->cmdsn);
1126 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1127 return -1;
1128
1129 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1130 int rc;
1131
1132 rc = iscsit_dump_data_payload(cmd->conn,
1133 cmd->first_burst_len, 1);
1134 target_put_sess_cmd(&cmd->se_cmd);
1135 return rc;
1136 } else if (cmd->unsolicited_data)
1137 iscsit_set_unsoliticed_dataout(cmd);
1138
1139 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1140 /*
1141 * Immediate Data failed DataCRC and ERL>=1,
1142 * silently drop this PDU and let the initiator
1143 * plug the CmdSN gap.
1144 *
1145 * FIXME: Send Unsolicited NOPIN with reserved
1146 * TTT here to help the initiator figure out
1147 * the missing CmdSN, although they should be
1148 * intelligent enough to determine the missing
1149 * CmdSN and issue a retry to plug the sequence.
1150 */
1151 cmd->i_state = ISTATE_REMOVE;
1152 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1153 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1154 return -1;
1155
1156 return 0;
1157 }
1158
1159 static int
1160 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1161 unsigned char *buf)
1162 {
1163 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1164 int rc, immed_data;
1165 bool dump_payload = false;
1166
1167 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1168 if (rc < 0)
1169 return 0;
1170 /*
1171 * Allocation iovecs needed for struct socket operations for
1172 * traditional iSCSI block I/O.
1173 */
1174 if (iscsit_allocate_iovecs(cmd) < 0) {
1175 return iscsit_reject_cmd(cmd,
1176 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1177 }
1178 immed_data = cmd->immediate_data;
1179
1180 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1181 if (rc < 0)
1182 return rc;
1183 else if (rc > 0)
1184 dump_payload = true;
1185
1186 if (!immed_data)
1187 return 0;
1188
1189 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1190 }
1191
1192 static u32 iscsit_do_crypto_hash_sg(
1193 struct hash_desc *hash,
1194 struct iscsi_cmd *cmd,
1195 u32 data_offset,
1196 u32 data_length,
1197 u32 padding,
1198 u8 *pad_bytes)
1199 {
1200 u32 data_crc;
1201 struct scatterlist *sg;
1202 unsigned int page_off;
1203
1204 crypto_hash_init(hash);
1205
1206 sg = cmd->first_data_sg;
1207 page_off = cmd->first_data_sg_off;
1208
1209 while (data_length) {
1210 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1211
1212 crypto_hash_update(hash, sg, cur_len);
1213
1214 data_length -= cur_len;
1215 page_off = 0;
1216 /* iscsit_map_iovec has already checked for invalid sg pointers */
1217 sg = sg_next(sg);
1218 }
1219
1220 if (padding) {
1221 struct scatterlist pad_sg;
1222
1223 sg_init_one(&pad_sg, pad_bytes, padding);
1224 crypto_hash_update(hash, &pad_sg, padding);
1225 }
1226 crypto_hash_final(hash, (u8 *) &data_crc);
1227
1228 return data_crc;
1229 }
1230
1231 static void iscsit_do_crypto_hash_buf(
1232 struct hash_desc *hash,
1233 const void *buf,
1234 u32 payload_length,
1235 u32 padding,
1236 u8 *pad_bytes,
1237 u8 *data_crc)
1238 {
1239 struct scatterlist sg;
1240
1241 crypto_hash_init(hash);
1242
1243 sg_init_one(&sg, buf, payload_length);
1244 crypto_hash_update(hash, &sg, payload_length);
1245
1246 if (padding) {
1247 sg_init_one(&sg, pad_bytes, padding);
1248 crypto_hash_update(hash, &sg, padding);
1249 }
1250 crypto_hash_final(hash, data_crc);
1251 }
1252
1253 int
1254 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1255 struct iscsi_cmd **out_cmd)
1256 {
1257 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1258 struct iscsi_cmd *cmd = NULL;
1259 struct se_cmd *se_cmd;
1260 u32 payload_length = ntoh24(hdr->dlength);
1261 int rc;
1262
1263 if (!payload_length) {
1264 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1265 return 0;
1266 }
1267
1268 /* iSCSI write */
1269 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1270
1271 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1272 pr_err("DataSegmentLength: %u is greater than"
1273 " MaxXmitDataSegmentLength: %u\n", payload_length,
1274 conn->conn_ops->MaxXmitDataSegmentLength);
1275 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1276 buf);
1277 }
1278
1279 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1280 payload_length);
1281 if (!cmd)
1282 return 0;
1283
1284 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1285 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1286 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1287 payload_length, conn->cid);
1288
1289 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1290 pr_err("Command ITT: 0x%08x received DataOUT after"
1291 " last DataOUT received, dumping payload\n",
1292 cmd->init_task_tag);
1293 return iscsit_dump_data_payload(conn, payload_length, 1);
1294 }
1295
1296 if (cmd->data_direction != DMA_TO_DEVICE) {
1297 pr_err("Command ITT: 0x%08x received DataOUT for a"
1298 " NON-WRITE command.\n", cmd->init_task_tag);
1299 return iscsit_dump_data_payload(conn, payload_length, 1);
1300 }
1301 se_cmd = &cmd->se_cmd;
1302 iscsit_mod_dataout_timer(cmd);
1303
1304 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1305 pr_err("DataOut Offset: %u, Length %u greater than"
1306 " iSCSI Command EDTL %u, protocol error.\n",
1307 hdr->offset, payload_length, cmd->se_cmd.data_length);
1308 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1309 }
1310
1311 if (cmd->unsolicited_data) {
1312 int dump_unsolicited_data = 0;
1313
1314 if (conn->sess->sess_ops->InitialR2T) {
1315 pr_err("Received unexpected unsolicited data"
1316 " while InitialR2T=Yes, protocol error.\n");
1317 transport_send_check_condition_and_sense(&cmd->se_cmd,
1318 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1319 return -1;
1320 }
1321 /*
1322 * Special case for dealing with Unsolicited DataOUT
1323 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1324 * failures;
1325 */
1326
1327 /* Something's amiss if we're not in WRITE_PENDING state... */
1328 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1329 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1330 dump_unsolicited_data = 1;
1331
1332 if (dump_unsolicited_data) {
1333 /*
1334 * Check if a delayed TASK_ABORTED status needs to
1335 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1336 * received with the unsolicitied data out.
1337 */
1338 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1339 iscsit_stop_dataout_timer(cmd);
1340
1341 transport_check_aborted_status(se_cmd,
1342 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1343 return iscsit_dump_data_payload(conn, payload_length, 1);
1344 }
1345 } else {
1346 /*
1347 * For the normal solicited data path:
1348 *
1349 * Check for a delayed TASK_ABORTED status and dump any
1350 * incoming data out payload if one exists. Also, when the
1351 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1352 * data out sequence, we decrement outstanding_r2ts. Once
1353 * outstanding_r2ts reaches zero, go ahead and send the delayed
1354 * TASK_ABORTED status.
1355 */
1356 if (se_cmd->transport_state & CMD_T_ABORTED) {
1357 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1358 if (--cmd->outstanding_r2ts < 1) {
1359 iscsit_stop_dataout_timer(cmd);
1360 transport_check_aborted_status(
1361 se_cmd, 1);
1362 }
1363
1364 return iscsit_dump_data_payload(conn, payload_length, 1);
1365 }
1366 }
1367 /*
1368 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1369 * within-command recovery checks before receiving the payload.
1370 */
1371 rc = iscsit_check_pre_dataout(cmd, buf);
1372 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1373 return 0;
1374 else if (rc == DATAOUT_CANNOT_RECOVER)
1375 return -1;
1376
1377 *out_cmd = cmd;
1378 return 0;
1379 }
1380 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1381
1382 static int
1383 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1384 struct iscsi_data *hdr)
1385 {
1386 struct kvec *iov;
1387 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1388 u32 payload_length = ntoh24(hdr->dlength);
1389 int iov_ret, data_crc_failed = 0;
1390
1391 rx_size += payload_length;
1392 iov = &cmd->iov_data[0];
1393
1394 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1395 payload_length);
1396 if (iov_ret < 0)
1397 return -1;
1398
1399 iov_count += iov_ret;
1400
1401 padding = ((-payload_length) & 3);
1402 if (padding != 0) {
1403 iov[iov_count].iov_base = cmd->pad_bytes;
1404 iov[iov_count++].iov_len = padding;
1405 rx_size += padding;
1406 pr_debug("Receiving %u padding bytes.\n", padding);
1407 }
1408
1409 if (conn->conn_ops->DataDigest) {
1410 iov[iov_count].iov_base = &checksum;
1411 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1412 rx_size += ISCSI_CRC_LEN;
1413 }
1414
1415 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1416
1417 iscsit_unmap_iovec(cmd);
1418
1419 if (rx_got != rx_size)
1420 return -1;
1421
1422 if (conn->conn_ops->DataDigest) {
1423 u32 data_crc;
1424
1425 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1426 be32_to_cpu(hdr->offset),
1427 payload_length, padding,
1428 cmd->pad_bytes);
1429
1430 if (checksum != data_crc) {
1431 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1432 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1433 " does not match computed 0x%08x\n",
1434 hdr->itt, hdr->offset, payload_length,
1435 hdr->datasn, checksum, data_crc);
1436 data_crc_failed = 1;
1437 } else {
1438 pr_debug("Got CRC32C DataDigest 0x%08x for"
1439 " %u bytes of Data Out\n", checksum,
1440 payload_length);
1441 }
1442 }
1443
1444 return data_crc_failed;
1445 }
1446
1447 int
1448 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1449 bool data_crc_failed)
1450 {
1451 struct iscsi_conn *conn = cmd->conn;
1452 int rc, ooo_cmdsn;
1453 /*
1454 * Increment post receive data and CRC values or perform
1455 * within-command recovery.
1456 */
1457 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1458 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1459 return 0;
1460 else if (rc == DATAOUT_SEND_R2T) {
1461 iscsit_set_dataout_sequence_values(cmd);
1462 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1463 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1464 /*
1465 * Handle extra special case for out of order
1466 * Unsolicited Data Out.
1467 */
1468 spin_lock_bh(&cmd->istate_lock);
1469 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1470 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1471 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1472 spin_unlock_bh(&cmd->istate_lock);
1473
1474 iscsit_stop_dataout_timer(cmd);
1475 if (ooo_cmdsn)
1476 return 0;
1477 target_execute_cmd(&cmd->se_cmd);
1478 return 0;
1479 } else /* DATAOUT_CANNOT_RECOVER */
1480 return -1;
1481
1482 return 0;
1483 }
1484 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1485
1486 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1487 {
1488 struct iscsi_cmd *cmd = NULL;
1489 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1490 int rc;
1491 bool data_crc_failed = false;
1492
1493 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1494 if (rc < 0)
1495 return 0;
1496 else if (!cmd)
1497 return 0;
1498
1499 rc = iscsit_get_dataout(conn, cmd, hdr);
1500 if (rc < 0)
1501 return rc;
1502 else if (rc > 0)
1503 data_crc_failed = true;
1504
1505 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1506 }
1507
1508 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1509 struct iscsi_nopout *hdr)
1510 {
1511 u32 payload_length = ntoh24(hdr->dlength);
1512
1513 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1514 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1515 if (!cmd)
1516 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1517 (unsigned char *)hdr);
1518
1519 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1520 (unsigned char *)hdr);
1521 }
1522
1523 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1524 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1525 " not set, protocol error.\n");
1526 if (!cmd)
1527 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1528 (unsigned char *)hdr);
1529
1530 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1531 (unsigned char *)hdr);
1532 }
1533
1534 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1535 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1536 " greater than MaxXmitDataSegmentLength: %u, protocol"
1537 " error.\n", payload_length,
1538 conn->conn_ops->MaxXmitDataSegmentLength);
1539 if (!cmd)
1540 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1541 (unsigned char *)hdr);
1542
1543 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1544 (unsigned char *)hdr);
1545 }
1546
1547 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1548 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1549 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1550 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1551 payload_length);
1552 /*
1553 * This is not a response to a Unsolicited NopIN, which means
1554 * it can either be a NOPOUT ping request (with a valid ITT),
1555 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1556 * Either way, make sure we allocate an struct iscsi_cmd, as both
1557 * can contain ping data.
1558 */
1559 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1560 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1561 cmd->i_state = ISTATE_SEND_NOPIN;
1562 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1563 1 : 0);
1564 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1565 cmd->targ_xfer_tag = 0xFFFFFFFF;
1566 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1567 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1568 cmd->data_direction = DMA_NONE;
1569 }
1570
1571 return 0;
1572 }
1573 EXPORT_SYMBOL(iscsit_setup_nop_out);
1574
1575 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1576 struct iscsi_nopout *hdr)
1577 {
1578 struct iscsi_cmd *cmd_p = NULL;
1579 int cmdsn_ret = 0;
1580 /*
1581 * Initiator is expecting a NopIN ping reply..
1582 */
1583 if (hdr->itt != RESERVED_ITT) {
1584 if (!cmd)
1585 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1586 (unsigned char *)hdr);
1587
1588 spin_lock_bh(&conn->cmd_lock);
1589 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1590 spin_unlock_bh(&conn->cmd_lock);
1591
1592 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1593
1594 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1595 iscsit_add_cmd_to_response_queue(cmd, conn,
1596 cmd->i_state);
1597 return 0;
1598 }
1599
1600 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1601 (unsigned char *)hdr, hdr->cmdsn);
1602 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1603 return 0;
1604 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1605 return -1;
1606
1607 return 0;
1608 }
1609 /*
1610 * This was a response to a unsolicited NOPIN ping.
1611 */
1612 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1613 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1614 if (!cmd_p)
1615 return -EINVAL;
1616
1617 iscsit_stop_nopin_response_timer(conn);
1618
1619 cmd_p->i_state = ISTATE_REMOVE;
1620 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1621
1622 iscsit_start_nopin_timer(conn);
1623 return 0;
1624 }
1625 /*
1626 * Otherwise, initiator is not expecting a NOPIN is response.
1627 * Just ignore for now.
1628 */
1629 return 0;
1630 }
1631 EXPORT_SYMBOL(iscsit_process_nop_out);
1632
1633 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1634 unsigned char *buf)
1635 {
1636 unsigned char *ping_data = NULL;
1637 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1638 struct kvec *iov = NULL;
1639 u32 payload_length = ntoh24(hdr->dlength);
1640 int ret;
1641
1642 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1643 if (ret < 0)
1644 return 0;
1645 /*
1646 * Handle NOP-OUT payload for traditional iSCSI sockets
1647 */
1648 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1649 u32 checksum, data_crc, padding = 0;
1650 int niov = 0, rx_got, rx_size = payload_length;
1651
1652 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1653 if (!ping_data) {
1654 pr_err("Unable to allocate memory for"
1655 " NOPOUT ping data.\n");
1656 ret = -1;
1657 goto out;
1658 }
1659
1660 iov = &cmd->iov_misc[0];
1661 iov[niov].iov_base = ping_data;
1662 iov[niov++].iov_len = payload_length;
1663
1664 padding = ((-payload_length) & 3);
1665 if (padding != 0) {
1666 pr_debug("Receiving %u additional bytes"
1667 " for padding.\n", padding);
1668 iov[niov].iov_base = &cmd->pad_bytes;
1669 iov[niov++].iov_len = padding;
1670 rx_size += padding;
1671 }
1672 if (conn->conn_ops->DataDigest) {
1673 iov[niov].iov_base = &checksum;
1674 iov[niov++].iov_len = ISCSI_CRC_LEN;
1675 rx_size += ISCSI_CRC_LEN;
1676 }
1677
1678 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1679 if (rx_got != rx_size) {
1680 ret = -1;
1681 goto out;
1682 }
1683
1684 if (conn->conn_ops->DataDigest) {
1685 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1686 ping_data, payload_length,
1687 padding, cmd->pad_bytes,
1688 (u8 *)&data_crc);
1689
1690 if (checksum != data_crc) {
1691 pr_err("Ping data CRC32C DataDigest"
1692 " 0x%08x does not match computed 0x%08x\n",
1693 checksum, data_crc);
1694 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1695 pr_err("Unable to recover from"
1696 " NOPOUT Ping DataCRC failure while in"
1697 " ERL=0.\n");
1698 ret = -1;
1699 goto out;
1700 } else {
1701 /*
1702 * Silently drop this PDU and let the
1703 * initiator plug the CmdSN gap.
1704 */
1705 pr_debug("Dropping NOPOUT"
1706 " Command CmdSN: 0x%08x due to"
1707 " DataCRC error.\n", hdr->cmdsn);
1708 ret = 0;
1709 goto out;
1710 }
1711 } else {
1712 pr_debug("Got CRC32C DataDigest"
1713 " 0x%08x for %u bytes of ping data.\n",
1714 checksum, payload_length);
1715 }
1716 }
1717
1718 ping_data[payload_length] = '\0';
1719 /*
1720 * Attach ping data to struct iscsi_cmd->buf_ptr.
1721 */
1722 cmd->buf_ptr = ping_data;
1723 cmd->buf_ptr_size = payload_length;
1724
1725 pr_debug("Got %u bytes of NOPOUT ping"
1726 " data.\n", payload_length);
1727 pr_debug("Ping Data: \"%s\"\n", ping_data);
1728 }
1729
1730 return iscsit_process_nop_out(conn, cmd, hdr);
1731 out:
1732 if (cmd)
1733 iscsit_free_cmd(cmd, false);
1734
1735 kfree(ping_data);
1736 return ret;
1737 }
1738
1739 int
1740 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1741 unsigned char *buf)
1742 {
1743 struct se_tmr_req *se_tmr;
1744 struct iscsi_tmr_req *tmr_req;
1745 struct iscsi_tm *hdr;
1746 int out_of_order_cmdsn = 0, ret;
1747 bool sess_ref = false;
1748 u8 function;
1749
1750 hdr = (struct iscsi_tm *) buf;
1751 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1752 function = hdr->flags;
1753
1754 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1755 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1756 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1757 hdr->rtt, hdr->refcmdsn, conn->cid);
1758
1759 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1760 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1761 hdr->rtt != RESERVED_ITT)) {
1762 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1763 hdr->rtt = RESERVED_ITT;
1764 }
1765
1766 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1767 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1768 pr_err("Task Management Request TASK_REASSIGN not"
1769 " issued as immediate command, bad iSCSI Initiator"
1770 "implementation\n");
1771 return iscsit_add_reject_cmd(cmd,
1772 ISCSI_REASON_PROTOCOL_ERROR, buf);
1773 }
1774 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1775 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1776 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1777
1778 cmd->data_direction = DMA_NONE;
1779
1780 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1781 if (!cmd->tmr_req) {
1782 pr_err("Unable to allocate memory for"
1783 " Task Management command!\n");
1784 return iscsit_add_reject_cmd(cmd,
1785 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1786 buf);
1787 }
1788
1789 /*
1790 * TASK_REASSIGN for ERL=2 / connection stays inside of
1791 * LIO-Target $FABRIC_MOD
1792 */
1793 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1794
1795 u8 tcm_function;
1796 int ret;
1797
1798 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1799 conn->sess->se_sess, 0, DMA_NONE,
1800 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1801
1802 target_get_sess_cmd(&cmd->se_cmd, true);
1803 sess_ref = true;
1804
1805 switch (function) {
1806 case ISCSI_TM_FUNC_ABORT_TASK:
1807 tcm_function = TMR_ABORT_TASK;
1808 break;
1809 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1810 tcm_function = TMR_ABORT_TASK_SET;
1811 break;
1812 case ISCSI_TM_FUNC_CLEAR_ACA:
1813 tcm_function = TMR_CLEAR_ACA;
1814 break;
1815 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1816 tcm_function = TMR_CLEAR_TASK_SET;
1817 break;
1818 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1819 tcm_function = TMR_LUN_RESET;
1820 break;
1821 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1822 tcm_function = TMR_TARGET_WARM_RESET;
1823 break;
1824 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1825 tcm_function = TMR_TARGET_COLD_RESET;
1826 break;
1827 default:
1828 pr_err("Unknown iSCSI TMR Function:"
1829 " 0x%02x\n", function);
1830 return iscsit_add_reject_cmd(cmd,
1831 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1832 }
1833
1834 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1835 tcm_function, GFP_KERNEL);
1836 if (ret < 0)
1837 return iscsit_add_reject_cmd(cmd,
1838 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1839
1840 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1841 }
1842
1843 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1844 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1845 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1846 cmd->init_task_tag = hdr->itt;
1847 cmd->targ_xfer_tag = 0xFFFFFFFF;
1848 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1849 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1850 se_tmr = cmd->se_cmd.se_tmr_req;
1851 tmr_req = cmd->tmr_req;
1852 /*
1853 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1854 */
1855 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1856 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1857 scsilun_to_int(&hdr->lun));
1858 if (ret < 0) {
1859 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1860 goto attach;
1861 }
1862 }
1863
1864 switch (function) {
1865 case ISCSI_TM_FUNC_ABORT_TASK:
1866 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1867 if (se_tmr->response)
1868 goto attach;
1869 break;
1870 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1871 case ISCSI_TM_FUNC_CLEAR_ACA:
1872 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1873 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1874 break;
1875 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1876 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1877 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1878 goto attach;
1879 }
1880 break;
1881 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1882 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1883 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1884 goto attach;
1885 }
1886 break;
1887 case ISCSI_TM_FUNC_TASK_REASSIGN:
1888 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1889 /*
1890 * Perform sanity checks on the ExpDataSN only if the
1891 * TASK_REASSIGN was successful.
1892 */
1893 if (se_tmr->response)
1894 break;
1895
1896 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1897 return iscsit_add_reject_cmd(cmd,
1898 ISCSI_REASON_BOOKMARK_INVALID, buf);
1899 break;
1900 default:
1901 pr_err("Unknown TMR function: 0x%02x, protocol"
1902 " error.\n", function);
1903 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1904 goto attach;
1905 }
1906
1907 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1908 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1909 se_tmr->call_transport = 1;
1910 attach:
1911 spin_lock_bh(&conn->cmd_lock);
1912 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1913 spin_unlock_bh(&conn->cmd_lock);
1914
1915 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1916 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1917 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1918 out_of_order_cmdsn = 1;
1919 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1920 return 0;
1921 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1922 return -1;
1923 }
1924 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1925
1926 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1927 return 0;
1928 /*
1929 * Found the referenced task, send to transport for processing.
1930 */
1931 if (se_tmr->call_transport)
1932 return transport_generic_handle_tmr(&cmd->se_cmd);
1933
1934 /*
1935 * Could not find the referenced LUN, task, or Task Management
1936 * command not authorized or supported. Change state and
1937 * let the tx_thread send the response.
1938 *
1939 * For connection recovery, this is also the default action for
1940 * TMR TASK_REASSIGN.
1941 */
1942 if (sess_ref) {
1943 pr_debug("Handle TMR, using sess_ref=true check\n");
1944 target_put_sess_cmd(&cmd->se_cmd);
1945 }
1946
1947 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1948 return 0;
1949 }
1950 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1951
1952 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1953 int
1954 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1955 struct iscsi_text *hdr)
1956 {
1957 u32 payload_length = ntoh24(hdr->dlength);
1958
1959 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1960 pr_err("Unable to accept text parameter length: %u"
1961 "greater than MaxXmitDataSegmentLength %u.\n",
1962 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1963 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1964 (unsigned char *)hdr);
1965 }
1966
1967 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1968 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1969 pr_err("Multi sequence text commands currently not supported\n");
1970 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1971 (unsigned char *)hdr);
1972 }
1973
1974 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1975 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1976 hdr->exp_statsn, payload_length);
1977
1978 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1979 cmd->i_state = ISTATE_SEND_TEXTRSP;
1980 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1981 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1982 cmd->targ_xfer_tag = 0xFFFFFFFF;
1983 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1984 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1985 cmd->data_direction = DMA_NONE;
1986 cmd->text_in_ptr = NULL;
1987
1988 return 0;
1989 }
1990 EXPORT_SYMBOL(iscsit_setup_text_cmd);
1991
1992 int
1993 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1994 struct iscsi_text *hdr)
1995 {
1996 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
1997 int cmdsn_ret;
1998
1999 if (!text_in) {
2000 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2001 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2002 pr_err("Unable to locate text_in buffer for sendtargets"
2003 " discovery\n");
2004 goto reject;
2005 }
2006 goto empty_sendtargets;
2007 }
2008 if (strncmp("SendTargets", text_in, 11) != 0) {
2009 pr_err("Received Text Data that is not"
2010 " SendTargets, cannot continue.\n");
2011 goto reject;
2012 }
2013 text_ptr = strchr(text_in, '=');
2014 if (!text_ptr) {
2015 pr_err("No \"=\" separator found in Text Data,"
2016 " cannot continue.\n");
2017 goto reject;
2018 }
2019 if (!strncmp("=All", text_ptr, 4)) {
2020 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2021 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2022 !strncmp("=eui.", text_ptr, 5)) {
2023 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2024 } else {
2025 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2026 goto reject;
2027 }
2028
2029 spin_lock_bh(&conn->cmd_lock);
2030 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2031 spin_unlock_bh(&conn->cmd_lock);
2032
2033 empty_sendtargets:
2034 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2035
2036 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2037 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2038 (unsigned char *)hdr, hdr->cmdsn);
2039 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2040 return -1;
2041
2042 return 0;
2043 }
2044
2045 return iscsit_execute_cmd(cmd, 0);
2046
2047 reject:
2048 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2049 (unsigned char *)hdr);
2050 }
2051 EXPORT_SYMBOL(iscsit_process_text_cmd);
2052
2053 static int
2054 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2055 unsigned char *buf)
2056 {
2057 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2058 char *text_in = NULL;
2059 u32 payload_length = ntoh24(hdr->dlength);
2060 int rx_size, rc;
2061
2062 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2063 if (rc < 0)
2064 return 0;
2065
2066 rx_size = payload_length;
2067 if (payload_length) {
2068 u32 checksum = 0, data_crc = 0;
2069 u32 padding = 0, pad_bytes = 0;
2070 int niov = 0, rx_got;
2071 struct kvec iov[3];
2072
2073 text_in = kzalloc(payload_length, GFP_KERNEL);
2074 if (!text_in) {
2075 pr_err("Unable to allocate memory for"
2076 " incoming text parameters\n");
2077 goto reject;
2078 }
2079 cmd->text_in_ptr = text_in;
2080
2081 memset(iov, 0, 3 * sizeof(struct kvec));
2082 iov[niov].iov_base = text_in;
2083 iov[niov++].iov_len = payload_length;
2084
2085 padding = ((-payload_length) & 3);
2086 if (padding != 0) {
2087 iov[niov].iov_base = &pad_bytes;
2088 iov[niov++].iov_len = padding;
2089 rx_size += padding;
2090 pr_debug("Receiving %u additional bytes"
2091 " for padding.\n", padding);
2092 }
2093 if (conn->conn_ops->DataDigest) {
2094 iov[niov].iov_base = &checksum;
2095 iov[niov++].iov_len = ISCSI_CRC_LEN;
2096 rx_size += ISCSI_CRC_LEN;
2097 }
2098
2099 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2100 if (rx_got != rx_size)
2101 goto reject;
2102
2103 if (conn->conn_ops->DataDigest) {
2104 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2105 text_in, payload_length,
2106 padding, (u8 *)&pad_bytes,
2107 (u8 *)&data_crc);
2108
2109 if (checksum != data_crc) {
2110 pr_err("Text data CRC32C DataDigest"
2111 " 0x%08x does not match computed"
2112 " 0x%08x\n", checksum, data_crc);
2113 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2114 pr_err("Unable to recover from"
2115 " Text Data digest failure while in"
2116 " ERL=0.\n");
2117 goto reject;
2118 } else {
2119 /*
2120 * Silently drop this PDU and let the
2121 * initiator plug the CmdSN gap.
2122 */
2123 pr_debug("Dropping Text"
2124 " Command CmdSN: 0x%08x due to"
2125 " DataCRC error.\n", hdr->cmdsn);
2126 kfree(text_in);
2127 return 0;
2128 }
2129 } else {
2130 pr_debug("Got CRC32C DataDigest"
2131 " 0x%08x for %u bytes of text data.\n",
2132 checksum, payload_length);
2133 }
2134 }
2135 text_in[payload_length - 1] = '\0';
2136 pr_debug("Successfully read %d bytes of text"
2137 " data.\n", payload_length);
2138 }
2139
2140 return iscsit_process_text_cmd(conn, cmd, hdr);
2141
2142 reject:
2143 kfree(cmd->text_in_ptr);
2144 cmd->text_in_ptr = NULL;
2145 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2146 }
2147
2148 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2149 {
2150 struct iscsi_conn *conn_p;
2151 struct iscsi_session *sess = conn->sess;
2152
2153 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2154 " for SID: %u.\n", conn->cid, conn->sess->sid);
2155
2156 atomic_set(&sess->session_logout, 1);
2157 atomic_set(&conn->conn_logout_remove, 1);
2158 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2159
2160 iscsit_inc_conn_usage_count(conn);
2161 iscsit_inc_session_usage_count(sess);
2162
2163 spin_lock_bh(&sess->conn_lock);
2164 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2165 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2166 continue;
2167
2168 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2169 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2170 }
2171 spin_unlock_bh(&sess->conn_lock);
2172
2173 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2174
2175 return 0;
2176 }
2177
2178 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2179 {
2180 struct iscsi_conn *l_conn;
2181 struct iscsi_session *sess = conn->sess;
2182
2183 pr_debug("Received logout request CLOSECONNECTION for CID:"
2184 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2185
2186 /*
2187 * A Logout Request with a CLOSECONNECTION reason code for a CID
2188 * can arrive on a connection with a differing CID.
2189 */
2190 if (conn->cid == cmd->logout_cid) {
2191 spin_lock_bh(&conn->state_lock);
2192 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2193 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2194
2195 atomic_set(&conn->conn_logout_remove, 1);
2196 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2197 iscsit_inc_conn_usage_count(conn);
2198
2199 spin_unlock_bh(&conn->state_lock);
2200 } else {
2201 /*
2202 * Handle all different cid CLOSECONNECTION requests in
2203 * iscsit_logout_post_handler_diffcid() as to give enough
2204 * time for any non immediate command's CmdSN to be
2205 * acknowledged on the connection in question.
2206 *
2207 * Here we simply make sure the CID is still around.
2208 */
2209 l_conn = iscsit_get_conn_from_cid(sess,
2210 cmd->logout_cid);
2211 if (!l_conn) {
2212 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2213 iscsit_add_cmd_to_response_queue(cmd, conn,
2214 cmd->i_state);
2215 return 0;
2216 }
2217
2218 iscsit_dec_conn_usage_count(l_conn);
2219 }
2220
2221 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2222
2223 return 0;
2224 }
2225
2226 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2227 {
2228 struct iscsi_session *sess = conn->sess;
2229
2230 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2231 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2232
2233 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2234 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2235 " while ERL!=2.\n");
2236 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2237 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2238 return 0;
2239 }
2240
2241 if (conn->cid == cmd->logout_cid) {
2242 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2243 " with CID: %hu on CID: %hu, implementation error.\n",
2244 cmd->logout_cid, conn->cid);
2245 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2246 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2247 return 0;
2248 }
2249
2250 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2251
2252 return 0;
2253 }
2254
2255 int
2256 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2257 unsigned char *buf)
2258 {
2259 int cmdsn_ret, logout_remove = 0;
2260 u8 reason_code = 0;
2261 struct iscsi_logout *hdr;
2262 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2263
2264 hdr = (struct iscsi_logout *) buf;
2265 reason_code = (hdr->flags & 0x7f);
2266
2267 if (tiqn) {
2268 spin_lock(&tiqn->logout_stats.lock);
2269 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2270 tiqn->logout_stats.normal_logouts++;
2271 else
2272 tiqn->logout_stats.abnormal_logouts++;
2273 spin_unlock(&tiqn->logout_stats.lock);
2274 }
2275
2276 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2277 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2278 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2279 hdr->cid, conn->cid);
2280
2281 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2282 pr_err("Received logout request on connection that"
2283 " is not in logged in state, ignoring request.\n");
2284 iscsit_free_cmd(cmd, false);
2285 return 0;
2286 }
2287
2288 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2289 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2290 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2291 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2292 cmd->targ_xfer_tag = 0xFFFFFFFF;
2293 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2294 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2295 cmd->logout_cid = be16_to_cpu(hdr->cid);
2296 cmd->logout_reason = reason_code;
2297 cmd->data_direction = DMA_NONE;
2298
2299 /*
2300 * We need to sleep in these cases (by returning 1) until the Logout
2301 * Response gets sent in the tx thread.
2302 */
2303 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2304 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2305 be16_to_cpu(hdr->cid) == conn->cid))
2306 logout_remove = 1;
2307
2308 spin_lock_bh(&conn->cmd_lock);
2309 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2310 spin_unlock_bh(&conn->cmd_lock);
2311
2312 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2313 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2314
2315 /*
2316 * Immediate commands are executed, well, immediately.
2317 * Non-Immediate Logout Commands are executed in CmdSN order.
2318 */
2319 if (cmd->immediate_cmd) {
2320 int ret = iscsit_execute_cmd(cmd, 0);
2321
2322 if (ret < 0)
2323 return ret;
2324 } else {
2325 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2326 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2327 logout_remove = 0;
2328 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2329 return -1;
2330 }
2331
2332 return logout_remove;
2333 }
2334 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2335
2336 static int iscsit_handle_snack(
2337 struct iscsi_conn *conn,
2338 unsigned char *buf)
2339 {
2340 struct iscsi_snack *hdr;
2341
2342 hdr = (struct iscsi_snack *) buf;
2343 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2344
2345 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2346 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2347 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2348 hdr->begrun, hdr->runlength, conn->cid);
2349
2350 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2351 pr_err("Initiator sent SNACK request while in"
2352 " ErrorRecoveryLevel=0.\n");
2353 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2354 buf);
2355 }
2356 /*
2357 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2358 * call from inside iscsi_send_recovery_datain_or_r2t().
2359 */
2360 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2361 case 0:
2362 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2363 hdr->itt,
2364 be32_to_cpu(hdr->ttt),
2365 be32_to_cpu(hdr->begrun),
2366 be32_to_cpu(hdr->runlength));
2367 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2368 return iscsit_handle_status_snack(conn, hdr->itt,
2369 be32_to_cpu(hdr->ttt),
2370 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2371 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2372 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2373 be32_to_cpu(hdr->begrun),
2374 be32_to_cpu(hdr->runlength));
2375 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2376 /* FIXME: Support R-Data SNACK */
2377 pr_err("R-Data SNACK Not Supported.\n");
2378 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2379 buf);
2380 default:
2381 pr_err("Unknown SNACK type 0x%02x, protocol"
2382 " error.\n", hdr->flags & 0x0f);
2383 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2384 buf);
2385 }
2386
2387 return 0;
2388 }
2389
2390 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2391 {
2392 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2393 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2394 wait_for_completion_interruptible_timeout(
2395 &conn->rx_half_close_comp,
2396 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2397 }
2398 }
2399
2400 static int iscsit_handle_immediate_data(
2401 struct iscsi_cmd *cmd,
2402 struct iscsi_scsi_req *hdr,
2403 u32 length)
2404 {
2405 int iov_ret, rx_got = 0, rx_size = 0;
2406 u32 checksum, iov_count = 0, padding = 0;
2407 struct iscsi_conn *conn = cmd->conn;
2408 struct kvec *iov;
2409
2410 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2411 if (iov_ret < 0)
2412 return IMMEDIATE_DATA_CANNOT_RECOVER;
2413
2414 rx_size = length;
2415 iov_count = iov_ret;
2416 iov = &cmd->iov_data[0];
2417
2418 padding = ((-length) & 3);
2419 if (padding != 0) {
2420 iov[iov_count].iov_base = cmd->pad_bytes;
2421 iov[iov_count++].iov_len = padding;
2422 rx_size += padding;
2423 }
2424
2425 if (conn->conn_ops->DataDigest) {
2426 iov[iov_count].iov_base = &checksum;
2427 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2428 rx_size += ISCSI_CRC_LEN;
2429 }
2430
2431 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2432
2433 iscsit_unmap_iovec(cmd);
2434
2435 if (rx_got != rx_size) {
2436 iscsit_rx_thread_wait_for_tcp(conn);
2437 return IMMEDIATE_DATA_CANNOT_RECOVER;
2438 }
2439
2440 if (conn->conn_ops->DataDigest) {
2441 u32 data_crc;
2442
2443 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2444 cmd->write_data_done, length, padding,
2445 cmd->pad_bytes);
2446
2447 if (checksum != data_crc) {
2448 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2449 " does not match computed 0x%08x\n", checksum,
2450 data_crc);
2451
2452 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2453 pr_err("Unable to recover from"
2454 " Immediate Data digest failure while"
2455 " in ERL=0.\n");
2456 iscsit_reject_cmd(cmd,
2457 ISCSI_REASON_DATA_DIGEST_ERROR,
2458 (unsigned char *)hdr);
2459 return IMMEDIATE_DATA_CANNOT_RECOVER;
2460 } else {
2461 iscsit_reject_cmd(cmd,
2462 ISCSI_REASON_DATA_DIGEST_ERROR,
2463 (unsigned char *)hdr);
2464 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2465 }
2466 } else {
2467 pr_debug("Got CRC32C DataDigest 0x%08x for"
2468 " %u bytes of Immediate Data\n", checksum,
2469 length);
2470 }
2471 }
2472
2473 cmd->write_data_done += length;
2474
2475 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2476 spin_lock_bh(&cmd->istate_lock);
2477 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2478 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2479 spin_unlock_bh(&cmd->istate_lock);
2480 }
2481
2482 return IMMEDIATE_DATA_NORMAL_OPERATION;
2483 }
2484
2485 /*
2486 * Called with sess->conn_lock held.
2487 */
2488 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2489 with active network interface */
2490 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2491 {
2492 struct iscsi_cmd *cmd;
2493 struct iscsi_conn *conn_p;
2494 bool found = false;
2495
2496 /*
2497 * Only send a Asynchronous Message on connections whos network
2498 * interface is still functional.
2499 */
2500 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2501 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2502 iscsit_inc_conn_usage_count(conn_p);
2503 found = true;
2504 break;
2505 }
2506 }
2507
2508 if (!found)
2509 return;
2510
2511 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2512 if (!cmd) {
2513 iscsit_dec_conn_usage_count(conn_p);
2514 return;
2515 }
2516
2517 cmd->logout_cid = conn->cid;
2518 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2519 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2520
2521 spin_lock_bh(&conn_p->cmd_lock);
2522 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2523 spin_unlock_bh(&conn_p->cmd_lock);
2524
2525 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2526 iscsit_dec_conn_usage_count(conn_p);
2527 }
2528
2529 static int iscsit_send_conn_drop_async_message(
2530 struct iscsi_cmd *cmd,
2531 struct iscsi_conn *conn)
2532 {
2533 struct iscsi_async *hdr;
2534
2535 cmd->tx_size = ISCSI_HDR_LEN;
2536 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2537
2538 hdr = (struct iscsi_async *) cmd->pdu;
2539 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2540 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2541 cmd->init_task_tag = RESERVED_ITT;
2542 cmd->targ_xfer_tag = 0xFFFFFFFF;
2543 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2544 cmd->stat_sn = conn->stat_sn++;
2545 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2546 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2547 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2548 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2549 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2550 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2551 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2552
2553 if (conn->conn_ops->HeaderDigest) {
2554 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2555
2556 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2557 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2558
2559 cmd->tx_size += ISCSI_CRC_LEN;
2560 pr_debug("Attaching CRC32C HeaderDigest to"
2561 " Async Message 0x%08x\n", *header_digest);
2562 }
2563
2564 cmd->iov_misc[0].iov_base = cmd->pdu;
2565 cmd->iov_misc[0].iov_len = cmd->tx_size;
2566 cmd->iov_misc_count = 1;
2567
2568 pr_debug("Sending Connection Dropped Async Message StatSN:"
2569 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2570 cmd->logout_cid, conn->cid);
2571 return 0;
2572 }
2573
2574 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2575 {
2576 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2577 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2578 wait_for_completion_interruptible_timeout(
2579 &conn->tx_half_close_comp,
2580 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2581 }
2582 }
2583
2584 static void
2585 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2586 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2587 bool set_statsn)
2588 {
2589 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2590 hdr->flags = datain->flags;
2591 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2592 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2593 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2594 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2595 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2596 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2597 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2598 }
2599 }
2600 hton24(hdr->dlength, datain->length);
2601 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2602 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2603 (struct scsi_lun *)&hdr->lun);
2604 else
2605 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2606
2607 hdr->itt = cmd->init_task_tag;
2608
2609 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2610 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2611 else
2612 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2613 if (set_statsn)
2614 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2615 else
2616 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2617
2618 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2619 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2620 hdr->datasn = cpu_to_be32(datain->data_sn);
2621 hdr->offset = cpu_to_be32(datain->offset);
2622
2623 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2624 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2625 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2626 ntohl(hdr->offset), datain->length, conn->cid);
2627 }
2628
2629 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2630 {
2631 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2632 struct iscsi_datain datain;
2633 struct iscsi_datain_req *dr;
2634 struct kvec *iov;
2635 u32 iov_count = 0, tx_size = 0;
2636 int eodr = 0, ret, iov_ret;
2637 bool set_statsn = false;
2638
2639 memset(&datain, 0, sizeof(struct iscsi_datain));
2640 dr = iscsit_get_datain_values(cmd, &datain);
2641 if (!dr) {
2642 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2643 cmd->init_task_tag);
2644 return -1;
2645 }
2646 /*
2647 * Be paranoid and double check the logic for now.
2648 */
2649 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2650 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2651 " datain.length: %u exceeds cmd->data_length: %u\n",
2652 cmd->init_task_tag, datain.offset, datain.length,
2653 cmd->se_cmd.data_length);
2654 return -1;
2655 }
2656
2657 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2658 /*
2659 * Special case for successfully execution w/ both DATAIN
2660 * and Sense Data.
2661 */
2662 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2663 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2664 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2665 else {
2666 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2667 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2668 iscsit_increment_maxcmdsn(cmd, conn->sess);
2669 cmd->stat_sn = conn->stat_sn++;
2670 set_statsn = true;
2671 } else if (dr->dr_complete ==
2672 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2673 set_statsn = true;
2674 }
2675
2676 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2677
2678 iov = &cmd->iov_data[0];
2679 iov[iov_count].iov_base = cmd->pdu;
2680 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2681 tx_size += ISCSI_HDR_LEN;
2682
2683 if (conn->conn_ops->HeaderDigest) {
2684 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2685
2686 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2687 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2688
2689 iov[0].iov_len += ISCSI_CRC_LEN;
2690 tx_size += ISCSI_CRC_LEN;
2691
2692 pr_debug("Attaching CRC32 HeaderDigest"
2693 " for DataIN PDU 0x%08x\n", *header_digest);
2694 }
2695
2696 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2697 datain.offset, datain.length);
2698 if (iov_ret < 0)
2699 return -1;
2700
2701 iov_count += iov_ret;
2702 tx_size += datain.length;
2703
2704 cmd->padding = ((-datain.length) & 3);
2705 if (cmd->padding) {
2706 iov[iov_count].iov_base = cmd->pad_bytes;
2707 iov[iov_count++].iov_len = cmd->padding;
2708 tx_size += cmd->padding;
2709
2710 pr_debug("Attaching %u padding bytes\n",
2711 cmd->padding);
2712 }
2713 if (conn->conn_ops->DataDigest) {
2714 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2715 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2716
2717 iov[iov_count].iov_base = &cmd->data_crc;
2718 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2719 tx_size += ISCSI_CRC_LEN;
2720
2721 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2722 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2723 }
2724
2725 cmd->iov_data_count = iov_count;
2726 cmd->tx_size = tx_size;
2727
2728 ret = iscsit_fe_sendpage_sg(cmd, conn);
2729
2730 iscsit_unmap_iovec(cmd);
2731
2732 if (ret < 0) {
2733 iscsit_tx_thread_wait_for_tcp(conn);
2734 return ret;
2735 }
2736
2737 if (dr->dr_complete) {
2738 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2739 2 : 1;
2740 iscsit_free_datain_req(cmd, dr);
2741 }
2742
2743 return eodr;
2744 }
2745
2746 int
2747 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2748 struct iscsi_logout_rsp *hdr)
2749 {
2750 struct iscsi_conn *logout_conn = NULL;
2751 struct iscsi_conn_recovery *cr = NULL;
2752 struct iscsi_session *sess = conn->sess;
2753 /*
2754 * The actual shutting down of Sessions and/or Connections
2755 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2756 * is done in scsi_logout_post_handler().
2757 */
2758 switch (cmd->logout_reason) {
2759 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2760 pr_debug("iSCSI session logout successful, setting"
2761 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2762 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2763 break;
2764 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2765 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2766 break;
2767 /*
2768 * For CLOSECONNECTION logout requests carrying
2769 * a matching logout CID -> local CID, the reference
2770 * for the local CID will have been incremented in
2771 * iscsi_logout_closeconnection().
2772 *
2773 * For CLOSECONNECTION logout requests carrying
2774 * a different CID than the connection it arrived
2775 * on, the connection responding to cmd->logout_cid
2776 * is stopped in iscsit_logout_post_handler_diffcid().
2777 */
2778
2779 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2780 " successful.\n", cmd->logout_cid, conn->cid);
2781 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2782 break;
2783 case ISCSI_LOGOUT_REASON_RECOVERY:
2784 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2785 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2786 break;
2787 /*
2788 * If the connection is still active from our point of view
2789 * force connection recovery to occur.
2790 */
2791 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2792 cmd->logout_cid);
2793 if (logout_conn) {
2794 iscsit_connection_reinstatement_rcfr(logout_conn);
2795 iscsit_dec_conn_usage_count(logout_conn);
2796 }
2797
2798 cr = iscsit_get_inactive_connection_recovery_entry(
2799 conn->sess, cmd->logout_cid);
2800 if (!cr) {
2801 pr_err("Unable to locate CID: %hu for"
2802 " REMOVECONNFORRECOVERY Logout Request.\n",
2803 cmd->logout_cid);
2804 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2805 break;
2806 }
2807
2808 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2809
2810 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2811 " for recovery for CID: %hu on CID: %hu successful.\n",
2812 cmd->logout_cid, conn->cid);
2813 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2814 break;
2815 default:
2816 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2817 cmd->logout_reason);
2818 return -1;
2819 }
2820
2821 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2822 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2823 hdr->response = cmd->logout_response;
2824 hdr->itt = cmd->init_task_tag;
2825 cmd->stat_sn = conn->stat_sn++;
2826 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2827
2828 iscsit_increment_maxcmdsn(cmd, conn->sess);
2829 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2830 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2831
2832 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2833 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2834 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2835 cmd->logout_cid, conn->cid);
2836
2837 return 0;
2838 }
2839 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2840
2841 static int
2842 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2843 {
2844 struct kvec *iov;
2845 int niov = 0, tx_size, rc;
2846
2847 rc = iscsit_build_logout_rsp(cmd, conn,
2848 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2849 if (rc < 0)
2850 return rc;
2851
2852 tx_size = ISCSI_HDR_LEN;
2853 iov = &cmd->iov_misc[0];
2854 iov[niov].iov_base = cmd->pdu;
2855 iov[niov++].iov_len = ISCSI_HDR_LEN;
2856
2857 if (conn->conn_ops->HeaderDigest) {
2858 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2859
2860 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2861 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2862
2863 iov[0].iov_len += ISCSI_CRC_LEN;
2864 tx_size += ISCSI_CRC_LEN;
2865 pr_debug("Attaching CRC32C HeaderDigest to"
2866 " Logout Response 0x%08x\n", *header_digest);
2867 }
2868 cmd->iov_misc_count = niov;
2869 cmd->tx_size = tx_size;
2870
2871 return 0;
2872 }
2873
2874 void
2875 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2876 struct iscsi_nopin *hdr, bool nopout_response)
2877 {
2878 hdr->opcode = ISCSI_OP_NOOP_IN;
2879 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2880 hton24(hdr->dlength, cmd->buf_ptr_size);
2881 if (nopout_response)
2882 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2883 hdr->itt = cmd->init_task_tag;
2884 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2885 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2886 conn->stat_sn;
2887 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2888
2889 if (nopout_response)
2890 iscsit_increment_maxcmdsn(cmd, conn->sess);
2891
2892 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2893 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2894
2895 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2896 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2897 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2898 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2899 }
2900 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2901
2902 /*
2903 * Unsolicited NOPIN, either requesting a response or not.
2904 */
2905 static int iscsit_send_unsolicited_nopin(
2906 struct iscsi_cmd *cmd,
2907 struct iscsi_conn *conn,
2908 int want_response)
2909 {
2910 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2911 int tx_size = ISCSI_HDR_LEN, ret;
2912
2913 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2914
2915 if (conn->conn_ops->HeaderDigest) {
2916 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2917
2918 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2919 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2920
2921 tx_size += ISCSI_CRC_LEN;
2922 pr_debug("Attaching CRC32C HeaderDigest to"
2923 " NopIN 0x%08x\n", *header_digest);
2924 }
2925
2926 cmd->iov_misc[0].iov_base = cmd->pdu;
2927 cmd->iov_misc[0].iov_len = tx_size;
2928 cmd->iov_misc_count = 1;
2929 cmd->tx_size = tx_size;
2930
2931 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2932 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2933
2934 ret = iscsit_send_tx_data(cmd, conn, 1);
2935 if (ret < 0) {
2936 iscsit_tx_thread_wait_for_tcp(conn);
2937 return ret;
2938 }
2939
2940 spin_lock_bh(&cmd->istate_lock);
2941 cmd->i_state = want_response ?
2942 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2943 spin_unlock_bh(&cmd->istate_lock);
2944
2945 return 0;
2946 }
2947
2948 static int
2949 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2950 {
2951 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2952 struct kvec *iov;
2953 u32 padding = 0;
2954 int niov = 0, tx_size;
2955
2956 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2957
2958 tx_size = ISCSI_HDR_LEN;
2959 iov = &cmd->iov_misc[0];
2960 iov[niov].iov_base = cmd->pdu;
2961 iov[niov++].iov_len = ISCSI_HDR_LEN;
2962
2963 if (conn->conn_ops->HeaderDigest) {
2964 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2965
2966 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2967 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2968
2969 iov[0].iov_len += ISCSI_CRC_LEN;
2970 tx_size += ISCSI_CRC_LEN;
2971 pr_debug("Attaching CRC32C HeaderDigest"
2972 " to NopIn 0x%08x\n", *header_digest);
2973 }
2974
2975 /*
2976 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2977 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2978 */
2979 if (cmd->buf_ptr_size) {
2980 iov[niov].iov_base = cmd->buf_ptr;
2981 iov[niov++].iov_len = cmd->buf_ptr_size;
2982 tx_size += cmd->buf_ptr_size;
2983
2984 pr_debug("Echoing back %u bytes of ping"
2985 " data.\n", cmd->buf_ptr_size);
2986
2987 padding = ((-cmd->buf_ptr_size) & 3);
2988 if (padding != 0) {
2989 iov[niov].iov_base = &cmd->pad_bytes;
2990 iov[niov++].iov_len = padding;
2991 tx_size += padding;
2992 pr_debug("Attaching %u additional"
2993 " padding bytes.\n", padding);
2994 }
2995 if (conn->conn_ops->DataDigest) {
2996 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2997 cmd->buf_ptr, cmd->buf_ptr_size,
2998 padding, (u8 *)&cmd->pad_bytes,
2999 (u8 *)&cmd->data_crc);
3000
3001 iov[niov].iov_base = &cmd->data_crc;
3002 iov[niov++].iov_len = ISCSI_CRC_LEN;
3003 tx_size += ISCSI_CRC_LEN;
3004 pr_debug("Attached DataDigest for %u"
3005 " bytes of ping data, CRC 0x%08x\n",
3006 cmd->buf_ptr_size, cmd->data_crc);
3007 }
3008 }
3009
3010 cmd->iov_misc_count = niov;
3011 cmd->tx_size = tx_size;
3012
3013 return 0;
3014 }
3015
3016 static int iscsit_send_r2t(
3017 struct iscsi_cmd *cmd,
3018 struct iscsi_conn *conn)
3019 {
3020 int tx_size = 0;
3021 struct iscsi_r2t *r2t;
3022 struct iscsi_r2t_rsp *hdr;
3023 int ret;
3024
3025 r2t = iscsit_get_r2t_from_list(cmd);
3026 if (!r2t)
3027 return -1;
3028
3029 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3030 memset(hdr, 0, ISCSI_HDR_LEN);
3031 hdr->opcode = ISCSI_OP_R2T;
3032 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3033 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3034 (struct scsi_lun *)&hdr->lun);
3035 hdr->itt = cmd->init_task_tag;
3036 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3037 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3038 hdr->statsn = cpu_to_be32(conn->stat_sn);
3039 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3040 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3041 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3042 hdr->data_offset = cpu_to_be32(r2t->offset);
3043 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3044
3045 cmd->iov_misc[0].iov_base = cmd->pdu;
3046 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3047 tx_size += ISCSI_HDR_LEN;
3048
3049 if (conn->conn_ops->HeaderDigest) {
3050 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3051
3052 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3053 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3054
3055 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3056 tx_size += ISCSI_CRC_LEN;
3057 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3058 " PDU 0x%08x\n", *header_digest);
3059 }
3060
3061 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3062 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3063 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3064 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3065 r2t->offset, r2t->xfer_len, conn->cid);
3066
3067 cmd->iov_misc_count = 1;
3068 cmd->tx_size = tx_size;
3069
3070 spin_lock_bh(&cmd->r2t_lock);
3071 r2t->sent_r2t = 1;
3072 spin_unlock_bh(&cmd->r2t_lock);
3073
3074 ret = iscsit_send_tx_data(cmd, conn, 1);
3075 if (ret < 0) {
3076 iscsit_tx_thread_wait_for_tcp(conn);
3077 return ret;
3078 }
3079
3080 spin_lock_bh(&cmd->dataout_timeout_lock);
3081 iscsit_start_dataout_timer(cmd, conn);
3082 spin_unlock_bh(&cmd->dataout_timeout_lock);
3083
3084 return 0;
3085 }
3086
3087 /*
3088 * @recovery: If called from iscsi_task_reassign_complete_write() for
3089 * connection recovery.
3090 */
3091 int iscsit_build_r2ts_for_cmd(
3092 struct iscsi_conn *conn,
3093 struct iscsi_cmd *cmd,
3094 bool recovery)
3095 {
3096 int first_r2t = 1;
3097 u32 offset = 0, xfer_len = 0;
3098
3099 spin_lock_bh(&cmd->r2t_lock);
3100 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3101 spin_unlock_bh(&cmd->r2t_lock);
3102 return 0;
3103 }
3104
3105 if (conn->sess->sess_ops->DataSequenceInOrder &&
3106 !recovery)
3107 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3108
3109 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3110 if (conn->sess->sess_ops->DataSequenceInOrder) {
3111 offset = cmd->r2t_offset;
3112
3113 if (first_r2t && recovery) {
3114 int new_data_end = offset +
3115 conn->sess->sess_ops->MaxBurstLength -
3116 cmd->next_burst_len;
3117
3118 if (new_data_end > cmd->se_cmd.data_length)
3119 xfer_len = cmd->se_cmd.data_length - offset;
3120 else
3121 xfer_len =
3122 conn->sess->sess_ops->MaxBurstLength -
3123 cmd->next_burst_len;
3124 } else {
3125 int new_data_end = offset +
3126 conn->sess->sess_ops->MaxBurstLength;
3127
3128 if (new_data_end > cmd->se_cmd.data_length)
3129 xfer_len = cmd->se_cmd.data_length - offset;
3130 else
3131 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3132 }
3133 cmd->r2t_offset += xfer_len;
3134
3135 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3136 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3137 } else {
3138 struct iscsi_seq *seq;
3139
3140 seq = iscsit_get_seq_holder_for_r2t(cmd);
3141 if (!seq) {
3142 spin_unlock_bh(&cmd->r2t_lock);
3143 return -1;
3144 }
3145
3146 offset = seq->offset;
3147 xfer_len = seq->xfer_len;
3148
3149 if (cmd->seq_send_order == cmd->seq_count)
3150 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3151 }
3152 cmd->outstanding_r2ts++;
3153 first_r2t = 0;
3154
3155 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3156 spin_unlock_bh(&cmd->r2t_lock);
3157 return -1;
3158 }
3159
3160 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3161 break;
3162 }
3163 spin_unlock_bh(&cmd->r2t_lock);
3164
3165 return 0;
3166 }
3167
3168 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3169 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3170 {
3171 if (inc_stat_sn)
3172 cmd->stat_sn = conn->stat_sn++;
3173
3174 atomic_long_inc(&conn->sess->rsp_pdus);
3175
3176 memset(hdr, 0, ISCSI_HDR_LEN);
3177 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3178 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3179 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3180 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3181 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3182 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3183 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3184 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3185 }
3186 hdr->response = cmd->iscsi_response;
3187 hdr->cmd_status = cmd->se_cmd.scsi_status;
3188 hdr->itt = cmd->init_task_tag;
3189 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3190
3191 iscsit_increment_maxcmdsn(cmd, conn->sess);
3192 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3193 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3194
3195 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3196 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3197 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3198 cmd->se_cmd.scsi_status, conn->cid);
3199 }
3200 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3201
3202 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3203 {
3204 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3205 struct kvec *iov;
3206 u32 padding = 0, tx_size = 0;
3207 int iov_count = 0;
3208 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3209
3210 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3211
3212 iov = &cmd->iov_misc[0];
3213 iov[iov_count].iov_base = cmd->pdu;
3214 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3215 tx_size += ISCSI_HDR_LEN;
3216
3217 /*
3218 * Attach SENSE DATA payload to iSCSI Response PDU
3219 */
3220 if (cmd->se_cmd.sense_buffer &&
3221 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3222 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3223 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3224 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3225
3226 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3227 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3228 iov[iov_count].iov_base = cmd->sense_buffer;
3229 iov[iov_count++].iov_len =
3230 (cmd->se_cmd.scsi_sense_length + padding);
3231 tx_size += cmd->se_cmd.scsi_sense_length;
3232
3233 if (padding) {
3234 memset(cmd->sense_buffer +
3235 cmd->se_cmd.scsi_sense_length, 0, padding);
3236 tx_size += padding;
3237 pr_debug("Adding %u bytes of padding to"
3238 " SENSE.\n", padding);
3239 }
3240
3241 if (conn->conn_ops->DataDigest) {
3242 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3243 cmd->sense_buffer,
3244 (cmd->se_cmd.scsi_sense_length + padding),
3245 0, NULL, (u8 *)&cmd->data_crc);
3246
3247 iov[iov_count].iov_base = &cmd->data_crc;
3248 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3249 tx_size += ISCSI_CRC_LEN;
3250
3251 pr_debug("Attaching CRC32 DataDigest for"
3252 " SENSE, %u bytes CRC 0x%08x\n",
3253 (cmd->se_cmd.scsi_sense_length + padding),
3254 cmd->data_crc);
3255 }
3256
3257 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3258 " Response PDU\n",
3259 cmd->se_cmd.scsi_sense_length);
3260 }
3261
3262 if (conn->conn_ops->HeaderDigest) {
3263 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3264
3265 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3266 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3267
3268 iov[0].iov_len += ISCSI_CRC_LEN;
3269 tx_size += ISCSI_CRC_LEN;
3270 pr_debug("Attaching CRC32 HeaderDigest for Response"
3271 " PDU 0x%08x\n", *header_digest);
3272 }
3273
3274 cmd->iov_misc_count = iov_count;
3275 cmd->tx_size = tx_size;
3276
3277 return 0;
3278 }
3279
3280 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3281 {
3282 switch (se_tmr->response) {
3283 case TMR_FUNCTION_COMPLETE:
3284 return ISCSI_TMF_RSP_COMPLETE;
3285 case TMR_TASK_DOES_NOT_EXIST:
3286 return ISCSI_TMF_RSP_NO_TASK;
3287 case TMR_LUN_DOES_NOT_EXIST:
3288 return ISCSI_TMF_RSP_NO_LUN;
3289 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3290 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3291 case TMR_FUNCTION_REJECTED:
3292 default:
3293 return ISCSI_TMF_RSP_REJECTED;
3294 }
3295 }
3296
3297 void
3298 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3299 struct iscsi_tm_rsp *hdr)
3300 {
3301 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3302
3303 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3304 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3305 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3306 hdr->itt = cmd->init_task_tag;
3307 cmd->stat_sn = conn->stat_sn++;
3308 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3309
3310 iscsit_increment_maxcmdsn(cmd, conn->sess);
3311 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3312 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3313
3314 pr_debug("Built Task Management Response ITT: 0x%08x,"
3315 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3316 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3317 }
3318 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3319
3320 static int
3321 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3322 {
3323 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3324 u32 tx_size = 0;
3325
3326 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3327
3328 cmd->iov_misc[0].iov_base = cmd->pdu;
3329 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3330 tx_size += ISCSI_HDR_LEN;
3331
3332 if (conn->conn_ops->HeaderDigest) {
3333 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3334
3335 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3336 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3337
3338 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3339 tx_size += ISCSI_CRC_LEN;
3340 pr_debug("Attaching CRC32 HeaderDigest for Task"
3341 " Mgmt Response PDU 0x%08x\n", *header_digest);
3342 }
3343
3344 cmd->iov_misc_count = 1;
3345 cmd->tx_size = tx_size;
3346
3347 return 0;
3348 }
3349
3350 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3351 {
3352 bool ret = false;
3353
3354 if (np->np_sockaddr.ss_family == AF_INET6) {
3355 const struct sockaddr_in6 sin6 = {
3356 .sin6_addr = IN6ADDR_ANY_INIT };
3357 struct sockaddr_in6 *sock_in6 =
3358 (struct sockaddr_in6 *)&np->np_sockaddr;
3359
3360 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3361 sin6.sin6_addr.s6_addr, 16))
3362 ret = true;
3363 } else {
3364 struct sockaddr_in * sock_in =
3365 (struct sockaddr_in *)&np->np_sockaddr;
3366
3367 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3368 ret = true;
3369 }
3370
3371 return ret;
3372 }
3373
3374 #define SENDTARGETS_BUF_LIMIT 32768U
3375
3376 static int
3377 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3378 enum iscsit_transport_type network_transport,
3379 int skip_bytes, bool *completed)
3380 {
3381 char *payload = NULL;
3382 struct iscsi_conn *conn = cmd->conn;
3383 struct iscsi_portal_group *tpg;
3384 struct iscsi_tiqn *tiqn;
3385 struct iscsi_tpg_np *tpg_np;
3386 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3387 int target_name_printed;
3388 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3389 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3390 bool active;
3391
3392 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3393 SENDTARGETS_BUF_LIMIT);
3394
3395 payload = kzalloc(buffer_len, GFP_KERNEL);
3396 if (!payload) {
3397 pr_err("Unable to allocate memory for sendtargets"
3398 " response.\n");
3399 return -ENOMEM;
3400 }
3401 /*
3402 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3403 * explicit case..
3404 */
3405 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3406 text_ptr = strchr(text_in, '=');
3407 if (!text_ptr) {
3408 pr_err("Unable to locate '=' string in text_in:"
3409 " %s\n", text_in);
3410 kfree(payload);
3411 return -EINVAL;
3412 }
3413 /*
3414 * Skip over '=' character..
3415 */
3416 text_ptr += 1;
3417 }
3418
3419 spin_lock(&tiqn_lock);
3420 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3421 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3422 strcmp(tiqn->tiqn, text_ptr)) {
3423 continue;
3424 }
3425
3426 target_name_printed = 0;
3427
3428 spin_lock(&tiqn->tiqn_tpg_lock);
3429 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3430
3431 /* If demo_mode_discovery=0 and generate_node_acls=0
3432 * (demo mode dislabed) do not return
3433 * TargetName+TargetAddress unless a NodeACL exists.
3434 */
3435
3436 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3437 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3438 (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3439 cmd->conn->sess->sess_ops->InitiatorName))) {
3440 continue;
3441 }
3442
3443 spin_lock(&tpg->tpg_state_lock);
3444 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3445 spin_unlock(&tpg->tpg_state_lock);
3446
3447 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3448 continue;
3449
3450 spin_lock(&tpg->tpg_np_lock);
3451 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3452 tpg_np_list) {
3453 struct iscsi_np *np = tpg_np->tpg_np;
3454 bool inaddr_any = iscsit_check_inaddr_any(np);
3455 struct sockaddr_storage *sockaddr;
3456
3457 if (np->np_network_transport != network_transport)
3458 continue;
3459
3460 if (!target_name_printed) {
3461 len = sprintf(buf, "TargetName=%s",
3462 tiqn->tiqn);
3463 len += 1;
3464
3465 if ((len + payload_len) > buffer_len) {
3466 spin_unlock(&tpg->tpg_np_lock);
3467 spin_unlock(&tiqn->tiqn_tpg_lock);
3468 end_of_buf = 1;
3469 goto eob;
3470 }
3471
3472 if (skip_bytes && len <= skip_bytes) {
3473 skip_bytes -= len;
3474 } else {
3475 memcpy(payload + payload_len, buf, len);
3476 payload_len += len;
3477 target_name_printed = 1;
3478 if (len > skip_bytes)
3479 skip_bytes = 0;
3480 }
3481 }
3482
3483 if (inaddr_any)
3484 sockaddr = &conn->local_sockaddr;
3485 else
3486 sockaddr = &np->np_sockaddr;
3487
3488 len = sprintf(buf, "TargetAddress="
3489 "%pISpc,%hu",
3490 sockaddr,
3491 tpg->tpgt);
3492 len += 1;
3493
3494 if ((len + payload_len) > buffer_len) {
3495 spin_unlock(&tpg->tpg_np_lock);
3496 spin_unlock(&tiqn->tiqn_tpg_lock);
3497 end_of_buf = 1;
3498 goto eob;
3499 }
3500
3501 if (skip_bytes && len <= skip_bytes) {
3502 skip_bytes -= len;
3503 } else {
3504 memcpy(payload + payload_len, buf, len);
3505 payload_len += len;
3506 if (len > skip_bytes)
3507 skip_bytes = 0;
3508 }
3509 }
3510 spin_unlock(&tpg->tpg_np_lock);
3511 }
3512 spin_unlock(&tiqn->tiqn_tpg_lock);
3513 eob:
3514 if (end_of_buf) {
3515 *completed = false;
3516 break;
3517 }
3518
3519 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3520 break;
3521 }
3522 spin_unlock(&tiqn_lock);
3523
3524 cmd->buf_ptr = payload;
3525
3526 return payload_len;
3527 }
3528
3529 int
3530 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3531 struct iscsi_text_rsp *hdr,
3532 enum iscsit_transport_type network_transport)
3533 {
3534 int text_length, padding;
3535 bool completed = true;
3536
3537 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3538 cmd->read_data_done,
3539 &completed);
3540 if (text_length < 0)
3541 return text_length;
3542
3543 if (completed) {
3544 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3545 } else {
3546 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3547 cmd->read_data_done += text_length;
3548 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3549 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3550 }
3551 hdr->opcode = ISCSI_OP_TEXT_RSP;
3552 padding = ((-text_length) & 3);
3553 hton24(hdr->dlength, text_length);
3554 hdr->itt = cmd->init_task_tag;
3555 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3556 cmd->stat_sn = conn->stat_sn++;
3557 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3558
3559 iscsit_increment_maxcmdsn(cmd, conn->sess);
3560 /*
3561 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3562 * correctly increment MaxCmdSN for each response answering a
3563 * non immediate text request with a valid CmdSN.
3564 */
3565 cmd->maxcmdsn_inc = 0;
3566 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3567 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3568
3569 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3570 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3571 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3572 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3573 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3574
3575 return text_length + padding;
3576 }
3577 EXPORT_SYMBOL(iscsit_build_text_rsp);
3578
3579 static int iscsit_send_text_rsp(
3580 struct iscsi_cmd *cmd,
3581 struct iscsi_conn *conn)
3582 {
3583 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3584 struct kvec *iov;
3585 u32 tx_size = 0;
3586 int text_length, iov_count = 0, rc;
3587
3588 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP);
3589 if (rc < 0)
3590 return rc;
3591
3592 text_length = rc;
3593 iov = &cmd->iov_misc[0];
3594 iov[iov_count].iov_base = cmd->pdu;
3595 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3596 iov[iov_count].iov_base = cmd->buf_ptr;
3597 iov[iov_count++].iov_len = text_length;
3598
3599 tx_size += (ISCSI_HDR_LEN + text_length);
3600
3601 if (conn->conn_ops->HeaderDigest) {
3602 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3603
3604 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3605 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3606
3607 iov[0].iov_len += ISCSI_CRC_LEN;
3608 tx_size += ISCSI_CRC_LEN;
3609 pr_debug("Attaching CRC32 HeaderDigest for"
3610 " Text Response PDU 0x%08x\n", *header_digest);
3611 }
3612
3613 if (conn->conn_ops->DataDigest) {
3614 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3615 cmd->buf_ptr, text_length,
3616 0, NULL, (u8 *)&cmd->data_crc);
3617
3618 iov[iov_count].iov_base = &cmd->data_crc;
3619 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3620 tx_size += ISCSI_CRC_LEN;
3621
3622 pr_debug("Attaching DataDigest for %u bytes of text"
3623 " data, CRC 0x%08x\n", text_length,
3624 cmd->data_crc);
3625 }
3626
3627 cmd->iov_misc_count = iov_count;
3628 cmd->tx_size = tx_size;
3629
3630 return 0;
3631 }
3632
3633 void
3634 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3635 struct iscsi_reject *hdr)
3636 {
3637 hdr->opcode = ISCSI_OP_REJECT;
3638 hdr->reason = cmd->reject_reason;
3639 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3640 hton24(hdr->dlength, ISCSI_HDR_LEN);
3641 hdr->ffffffff = cpu_to_be32(0xffffffff);
3642 cmd->stat_sn = conn->stat_sn++;
3643 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3644 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3645 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3646
3647 }
3648 EXPORT_SYMBOL(iscsit_build_reject);
3649
3650 static int iscsit_send_reject(
3651 struct iscsi_cmd *cmd,
3652 struct iscsi_conn *conn)
3653 {
3654 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3655 struct kvec *iov;
3656 u32 iov_count = 0, tx_size;
3657
3658 iscsit_build_reject(cmd, conn, hdr);
3659
3660 iov = &cmd->iov_misc[0];
3661 iov[iov_count].iov_base = cmd->pdu;
3662 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3663 iov[iov_count].iov_base = cmd->buf_ptr;
3664 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3665
3666 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3667
3668 if (conn->conn_ops->HeaderDigest) {
3669 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3670
3671 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3672 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3673
3674 iov[0].iov_len += ISCSI_CRC_LEN;
3675 tx_size += ISCSI_CRC_LEN;
3676 pr_debug("Attaching CRC32 HeaderDigest for"
3677 " REJECT PDU 0x%08x\n", *header_digest);
3678 }
3679
3680 if (conn->conn_ops->DataDigest) {
3681 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3682 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3683
3684 iov[iov_count].iov_base = &cmd->data_crc;
3685 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3686 tx_size += ISCSI_CRC_LEN;
3687 pr_debug("Attaching CRC32 DataDigest for REJECT"
3688 " PDU 0x%08x\n", cmd->data_crc);
3689 }
3690
3691 cmd->iov_misc_count = iov_count;
3692 cmd->tx_size = tx_size;
3693
3694 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3695 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3696
3697 return 0;
3698 }
3699
3700 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3701 {
3702 int ord, cpu;
3703 /*
3704 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3705 * within iscsit_start_kthreads()
3706 *
3707 * Here we use bitmap_id to determine which CPU that this
3708 * iSCSI connection's RX/TX threads will be scheduled to
3709 * execute upon.
3710 */
3711 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3712 for_each_online_cpu(cpu) {
3713 if (ord-- == 0) {
3714 cpumask_set_cpu(cpu, conn->conn_cpumask);
3715 return;
3716 }
3717 }
3718 /*
3719 * This should never be reached..
3720 */
3721 dump_stack();
3722 cpumask_setall(conn->conn_cpumask);
3723 }
3724
3725 static inline void iscsit_thread_check_cpumask(
3726 struct iscsi_conn *conn,
3727 struct task_struct *p,
3728 int mode)
3729 {
3730 /*
3731 * mode == 1 signals iscsi_target_tx_thread() usage.
3732 * mode == 0 signals iscsi_target_rx_thread() usage.
3733 */
3734 if (mode == 1) {
3735 if (!conn->conn_tx_reset_cpumask)
3736 return;
3737 conn->conn_tx_reset_cpumask = 0;
3738 } else {
3739 if (!conn->conn_rx_reset_cpumask)
3740 return;
3741 conn->conn_rx_reset_cpumask = 0;
3742 }
3743 /*
3744 * Update the CPU mask for this single kthread so that
3745 * both TX and RX kthreads are scheduled to run on the
3746 * same CPU.
3747 */
3748 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3749 }
3750
3751 static int
3752 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3753 {
3754 int ret;
3755
3756 switch (state) {
3757 case ISTATE_SEND_R2T:
3758 ret = iscsit_send_r2t(cmd, conn);
3759 if (ret < 0)
3760 goto err;
3761 break;
3762 case ISTATE_REMOVE:
3763 spin_lock_bh(&conn->cmd_lock);
3764 list_del_init(&cmd->i_conn_node);
3765 spin_unlock_bh(&conn->cmd_lock);
3766
3767 iscsit_free_cmd(cmd, false);
3768 break;
3769 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3770 iscsit_mod_nopin_response_timer(conn);
3771 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3772 if (ret < 0)
3773 goto err;
3774 break;
3775 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3776 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3777 if (ret < 0)
3778 goto err;
3779 break;
3780 default:
3781 pr_err("Unknown Opcode: 0x%02x ITT:"
3782 " 0x%08x, i_state: %d on CID: %hu\n",
3783 cmd->iscsi_opcode, cmd->init_task_tag, state,
3784 conn->cid);
3785 goto err;
3786 }
3787
3788 return 0;
3789
3790 err:
3791 return -1;
3792 }
3793
3794 static int
3795 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3796 {
3797 struct iscsit_transport *t = conn->conn_transport;
3798 struct iscsi_queue_req *qr;
3799 struct iscsi_cmd *cmd;
3800 u8 state;
3801 int ret;
3802
3803 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3804 atomic_set(&conn->check_immediate_queue, 0);
3805 cmd = qr->cmd;
3806 state = qr->state;
3807 kmem_cache_free(lio_qr_cache, qr);
3808
3809 ret = t->iscsit_immediate_queue(conn, cmd, state);
3810 if (ret < 0)
3811 return ret;
3812 }
3813
3814 return 0;
3815 }
3816
3817 static int
3818 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3819 {
3820 int ret;
3821
3822 check_rsp_state:
3823 switch (state) {
3824 case ISTATE_SEND_DATAIN:
3825 ret = iscsit_send_datain(cmd, conn);
3826 if (ret < 0)
3827 goto err;
3828 else if (!ret)
3829 /* more drs */
3830 goto check_rsp_state;
3831 else if (ret == 1) {
3832 /* all done */
3833 spin_lock_bh(&cmd->istate_lock);
3834 cmd->i_state = ISTATE_SENT_STATUS;
3835 spin_unlock_bh(&cmd->istate_lock);
3836
3837 if (atomic_read(&conn->check_immediate_queue))
3838 return 1;
3839
3840 return 0;
3841 } else if (ret == 2) {
3842 /* Still must send status,
3843 SCF_TRANSPORT_TASK_SENSE was set */
3844 spin_lock_bh(&cmd->istate_lock);
3845 cmd->i_state = ISTATE_SEND_STATUS;
3846 spin_unlock_bh(&cmd->istate_lock);
3847 state = ISTATE_SEND_STATUS;
3848 goto check_rsp_state;
3849 }
3850
3851 break;
3852 case ISTATE_SEND_STATUS:
3853 case ISTATE_SEND_STATUS_RECOVERY:
3854 ret = iscsit_send_response(cmd, conn);
3855 break;
3856 case ISTATE_SEND_LOGOUTRSP:
3857 ret = iscsit_send_logout(cmd, conn);
3858 break;
3859 case ISTATE_SEND_ASYNCMSG:
3860 ret = iscsit_send_conn_drop_async_message(
3861 cmd, conn);
3862 break;
3863 case ISTATE_SEND_NOPIN:
3864 ret = iscsit_send_nopin(cmd, conn);
3865 break;
3866 case ISTATE_SEND_REJECT:
3867 ret = iscsit_send_reject(cmd, conn);
3868 break;
3869 case ISTATE_SEND_TASKMGTRSP:
3870 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3871 if (ret != 0)
3872 break;
3873 ret = iscsit_tmr_post_handler(cmd, conn);
3874 if (ret != 0)
3875 iscsit_fall_back_to_erl0(conn->sess);
3876 break;
3877 case ISTATE_SEND_TEXTRSP:
3878 ret = iscsit_send_text_rsp(cmd, conn);
3879 break;
3880 default:
3881 pr_err("Unknown Opcode: 0x%02x ITT:"
3882 " 0x%08x, i_state: %d on CID: %hu\n",
3883 cmd->iscsi_opcode, cmd->init_task_tag,
3884 state, conn->cid);
3885 goto err;
3886 }
3887 if (ret < 0)
3888 goto err;
3889
3890 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3891 iscsit_tx_thread_wait_for_tcp(conn);
3892 iscsit_unmap_iovec(cmd);
3893 goto err;
3894 }
3895 iscsit_unmap_iovec(cmd);
3896
3897 switch (state) {
3898 case ISTATE_SEND_LOGOUTRSP:
3899 if (!iscsit_logout_post_handler(cmd, conn))
3900 return -ECONNRESET;
3901 /* fall through */
3902 case ISTATE_SEND_STATUS:
3903 case ISTATE_SEND_ASYNCMSG:
3904 case ISTATE_SEND_NOPIN:
3905 case ISTATE_SEND_STATUS_RECOVERY:
3906 case ISTATE_SEND_TEXTRSP:
3907 case ISTATE_SEND_TASKMGTRSP:
3908 case ISTATE_SEND_REJECT:
3909 spin_lock_bh(&cmd->istate_lock);
3910 cmd->i_state = ISTATE_SENT_STATUS;
3911 spin_unlock_bh(&cmd->istate_lock);
3912 break;
3913 default:
3914 pr_err("Unknown Opcode: 0x%02x ITT:"
3915 " 0x%08x, i_state: %d on CID: %hu\n",
3916 cmd->iscsi_opcode, cmd->init_task_tag,
3917 cmd->i_state, conn->cid);
3918 goto err;
3919 }
3920
3921 if (atomic_read(&conn->check_immediate_queue))
3922 return 1;
3923
3924 return 0;
3925
3926 err:
3927 return -1;
3928 }
3929
3930 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3931 {
3932 struct iscsit_transport *t = conn->conn_transport;
3933 struct iscsi_queue_req *qr;
3934 struct iscsi_cmd *cmd;
3935 u8 state;
3936 int ret;
3937
3938 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3939 cmd = qr->cmd;
3940 state = qr->state;
3941 kmem_cache_free(lio_qr_cache, qr);
3942
3943 ret = t->iscsit_response_queue(conn, cmd, state);
3944 if (ret == 1 || ret < 0)
3945 return ret;
3946 }
3947
3948 return 0;
3949 }
3950
3951 int iscsi_target_tx_thread(void *arg)
3952 {
3953 int ret = 0;
3954 struct iscsi_conn *conn = arg;
3955 /*
3956 * Allow ourselves to be interrupted by SIGINT so that a
3957 * connection recovery / failure event can be triggered externally.
3958 */
3959 allow_signal(SIGINT);
3960
3961 while (!kthread_should_stop()) {
3962 /*
3963 * Ensure that both TX and RX per connection kthreads
3964 * are scheduled to run on the same CPU.
3965 */
3966 iscsit_thread_check_cpumask(conn, current, 1);
3967
3968 wait_event_interruptible(conn->queues_wq,
3969 !iscsit_conn_all_queues_empty(conn));
3970
3971 if (signal_pending(current))
3972 goto transport_err;
3973
3974 get_immediate:
3975 ret = iscsit_handle_immediate_queue(conn);
3976 if (ret < 0)
3977 goto transport_err;
3978
3979 ret = iscsit_handle_response_queue(conn);
3980 if (ret == 1)
3981 goto get_immediate;
3982 else if (ret == -ECONNRESET)
3983 goto out;
3984 else if (ret < 0)
3985 goto transport_err;
3986 }
3987
3988 transport_err:
3989 /*
3990 * Avoid the normal connection failure code-path if this connection
3991 * is still within LOGIN mode, and iscsi_np process context is
3992 * responsible for cleaning up the early connection failure.
3993 */
3994 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3995 iscsit_take_action_for_connection_exit(conn);
3996 out:
3997 return 0;
3998 }
3999
4000 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
4001 {
4002 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
4003 struct iscsi_cmd *cmd;
4004 int ret = 0;
4005
4006 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
4007 case ISCSI_OP_SCSI_CMD:
4008 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4009 if (!cmd)
4010 goto reject;
4011
4012 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
4013 break;
4014 case ISCSI_OP_SCSI_DATA_OUT:
4015 ret = iscsit_handle_data_out(conn, buf);
4016 break;
4017 case ISCSI_OP_NOOP_OUT:
4018 cmd = NULL;
4019 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4020 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4021 if (!cmd)
4022 goto reject;
4023 }
4024 ret = iscsit_handle_nop_out(conn, cmd, buf);
4025 break;
4026 case ISCSI_OP_SCSI_TMFUNC:
4027 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4028 if (!cmd)
4029 goto reject;
4030
4031 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4032 break;
4033 case ISCSI_OP_TEXT:
4034 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4035 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4036 if (!cmd)
4037 goto reject;
4038 } else {
4039 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4040 if (!cmd)
4041 goto reject;
4042 }
4043
4044 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4045 break;
4046 case ISCSI_OP_LOGOUT:
4047 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4048 if (!cmd)
4049 goto reject;
4050
4051 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4052 if (ret > 0)
4053 wait_for_completion_timeout(&conn->conn_logout_comp,
4054 SECONDS_FOR_LOGOUT_COMP * HZ);
4055 break;
4056 case ISCSI_OP_SNACK:
4057 ret = iscsit_handle_snack(conn, buf);
4058 break;
4059 default:
4060 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4061 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4062 pr_err("Cannot recover from unknown"
4063 " opcode while ERL=0, closing iSCSI connection.\n");
4064 return -1;
4065 }
4066 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
4067 " closing iSCSI connection.\n");
4068 ret = -1;
4069 break;
4070 }
4071
4072 return ret;
4073 reject:
4074 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4075 }
4076
4077 int iscsi_target_rx_thread(void *arg)
4078 {
4079 int ret, rc;
4080 u8 buffer[ISCSI_HDR_LEN], opcode;
4081 u32 checksum = 0, digest = 0;
4082 struct iscsi_conn *conn = arg;
4083 struct kvec iov;
4084 /*
4085 * Allow ourselves to be interrupted by SIGINT so that a
4086 * connection recovery / failure event can be triggered externally.
4087 */
4088 allow_signal(SIGINT);
4089 /*
4090 * Wait for iscsi_post_login_handler() to complete before allowing
4091 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4092 */
4093 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4094 if (rc < 0)
4095 return 0;
4096
4097 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4098 struct completion comp;
4099
4100 init_completion(&comp);
4101 rc = wait_for_completion_interruptible(&comp);
4102 if (rc < 0)
4103 goto transport_err;
4104
4105 goto transport_err;
4106 }
4107
4108 while (!kthread_should_stop()) {
4109 /*
4110 * Ensure that both TX and RX per connection kthreads
4111 * are scheduled to run on the same CPU.
4112 */
4113 iscsit_thread_check_cpumask(conn, current, 0);
4114
4115 memset(buffer, 0, ISCSI_HDR_LEN);
4116 memset(&iov, 0, sizeof(struct kvec));
4117
4118 iov.iov_base = buffer;
4119 iov.iov_len = ISCSI_HDR_LEN;
4120
4121 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4122 if (ret != ISCSI_HDR_LEN) {
4123 iscsit_rx_thread_wait_for_tcp(conn);
4124 goto transport_err;
4125 }
4126
4127 if (conn->conn_ops->HeaderDigest) {
4128 iov.iov_base = &digest;
4129 iov.iov_len = ISCSI_CRC_LEN;
4130
4131 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4132 if (ret != ISCSI_CRC_LEN) {
4133 iscsit_rx_thread_wait_for_tcp(conn);
4134 goto transport_err;
4135 }
4136
4137 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4138 buffer, ISCSI_HDR_LEN,
4139 0, NULL, (u8 *)&checksum);
4140
4141 if (digest != checksum) {
4142 pr_err("HeaderDigest CRC32C failed,"
4143 " received 0x%08x, computed 0x%08x\n",
4144 digest, checksum);
4145 /*
4146 * Set the PDU to 0xff so it will intentionally
4147 * hit default in the switch below.
4148 */
4149 memset(buffer, 0xff, ISCSI_HDR_LEN);
4150 atomic_long_inc(&conn->sess->conn_digest_errors);
4151 } else {
4152 pr_debug("Got HeaderDigest CRC32C"
4153 " 0x%08x\n", checksum);
4154 }
4155 }
4156
4157 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4158 goto transport_err;
4159
4160 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4161
4162 if (conn->sess->sess_ops->SessionType &&
4163 ((!(opcode & ISCSI_OP_TEXT)) ||
4164 (!(opcode & ISCSI_OP_LOGOUT)))) {
4165 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4166 " while in Discovery Session, rejecting.\n", opcode);
4167 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4168 buffer);
4169 goto transport_err;
4170 }
4171
4172 ret = iscsi_target_rx_opcode(conn, buffer);
4173 if (ret < 0)
4174 goto transport_err;
4175 }
4176
4177 transport_err:
4178 if (!signal_pending(current))
4179 atomic_set(&conn->transport_failed, 1);
4180 iscsit_take_action_for_connection_exit(conn);
4181 return 0;
4182 }
4183
4184 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4185 {
4186 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4187 struct iscsi_session *sess = conn->sess;
4188 /*
4189 * We expect this function to only ever be called from either RX or TX
4190 * thread context via iscsit_close_connection() once the other context
4191 * has been reset -> returned sleeping pre-handler state.
4192 */
4193 spin_lock_bh(&conn->cmd_lock);
4194 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4195
4196 list_del_init(&cmd->i_conn_node);
4197 spin_unlock_bh(&conn->cmd_lock);
4198
4199 iscsit_increment_maxcmdsn(cmd, sess);
4200
4201 iscsit_free_cmd(cmd, true);
4202
4203 spin_lock_bh(&conn->cmd_lock);
4204 }
4205 spin_unlock_bh(&conn->cmd_lock);
4206 }
4207
4208 static void iscsit_stop_timers_for_cmds(
4209 struct iscsi_conn *conn)
4210 {
4211 struct iscsi_cmd *cmd;
4212
4213 spin_lock_bh(&conn->cmd_lock);
4214 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4215 if (cmd->data_direction == DMA_TO_DEVICE)
4216 iscsit_stop_dataout_timer(cmd);
4217 }
4218 spin_unlock_bh(&conn->cmd_lock);
4219 }
4220
4221 int iscsit_close_connection(
4222 struct iscsi_conn *conn)
4223 {
4224 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4225 struct iscsi_session *sess = conn->sess;
4226
4227 pr_debug("Closing iSCSI connection CID %hu on SID:"
4228 " %u\n", conn->cid, sess->sid);
4229 /*
4230 * Always up conn_logout_comp for the traditional TCP case just in case
4231 * the RX Thread in iscsi_target_rx_opcode() is sleeping and the logout
4232 * response never got sent because the connection failed.
4233 *
4234 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4235 * to signal logout response TX interrupt completion. Go ahead and skip
4236 * this for iser since isert_rx_opcode() does not wait on logout failure,
4237 * and to avoid iscsi_conn pointer dereference in iser-target code.
4238 */
4239 if (conn->conn_transport->transport_type == ISCSI_TCP)
4240 complete(&conn->conn_logout_comp);
4241
4242 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4243 if (conn->tx_thread &&
4244 cmpxchg(&conn->tx_thread_active, true, false)) {
4245 send_sig(SIGINT, conn->tx_thread, 1);
4246 kthread_stop(conn->tx_thread);
4247 }
4248 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4249 if (conn->rx_thread &&
4250 cmpxchg(&conn->rx_thread_active, true, false)) {
4251 send_sig(SIGINT, conn->rx_thread, 1);
4252 kthread_stop(conn->rx_thread);
4253 }
4254 }
4255
4256 spin_lock(&iscsit_global->ts_bitmap_lock);
4257 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4258 get_order(1));
4259 spin_unlock(&iscsit_global->ts_bitmap_lock);
4260
4261 iscsit_stop_timers_for_cmds(conn);
4262 iscsit_stop_nopin_response_timer(conn);
4263 iscsit_stop_nopin_timer(conn);
4264
4265 if (conn->conn_transport->iscsit_wait_conn)
4266 conn->conn_transport->iscsit_wait_conn(conn);
4267
4268 /*
4269 * During Connection recovery drop unacknowledged out of order
4270 * commands for this connection, and prepare the other commands
4271 * for realligence.
4272 *
4273 * During normal operation clear the out of order commands (but
4274 * do not free the struct iscsi_ooo_cmdsn's) and release all
4275 * struct iscsi_cmds.
4276 */
4277 if (atomic_read(&conn->connection_recovery)) {
4278 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4279 iscsit_prepare_cmds_for_realligance(conn);
4280 } else {
4281 iscsit_clear_ooo_cmdsns_for_conn(conn);
4282 iscsit_release_commands_from_conn(conn);
4283 }
4284 iscsit_free_queue_reqs_for_conn(conn);
4285
4286 /*
4287 * Handle decrementing session or connection usage count if
4288 * a logout response was not able to be sent because the
4289 * connection failed. Fall back to Session Recovery here.
4290 */
4291 if (atomic_read(&conn->conn_logout_remove)) {
4292 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4293 iscsit_dec_conn_usage_count(conn);
4294 iscsit_dec_session_usage_count(sess);
4295 }
4296 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4297 iscsit_dec_conn_usage_count(conn);
4298
4299 atomic_set(&conn->conn_logout_remove, 0);
4300 atomic_set(&sess->session_reinstatement, 0);
4301 atomic_set(&sess->session_fall_back_to_erl0, 1);
4302 }
4303
4304 spin_lock_bh(&sess->conn_lock);
4305 list_del(&conn->conn_list);
4306
4307 /*
4308 * Attempt to let the Initiator know this connection failed by
4309 * sending an Connection Dropped Async Message on another
4310 * active connection.
4311 */
4312 if (atomic_read(&conn->connection_recovery))
4313 iscsit_build_conn_drop_async_message(conn);
4314
4315 spin_unlock_bh(&sess->conn_lock);
4316
4317 /*
4318 * If connection reinstatement is being performed on this connection,
4319 * up the connection reinstatement semaphore that is being blocked on
4320 * in iscsit_cause_connection_reinstatement().
4321 */
4322 spin_lock_bh(&conn->state_lock);
4323 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4324 spin_unlock_bh(&conn->state_lock);
4325 complete(&conn->conn_wait_comp);
4326 wait_for_completion(&conn->conn_post_wait_comp);
4327 spin_lock_bh(&conn->state_lock);
4328 }
4329
4330 /*
4331 * If connection reinstatement is being performed on this connection
4332 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4333 * connection wait rcfr semaphore that is being blocked on
4334 * an iscsit_connection_reinstatement_rcfr().
4335 */
4336 if (atomic_read(&conn->connection_wait_rcfr)) {
4337 spin_unlock_bh(&conn->state_lock);
4338 complete(&conn->conn_wait_rcfr_comp);
4339 wait_for_completion(&conn->conn_post_wait_comp);
4340 spin_lock_bh(&conn->state_lock);
4341 }
4342 atomic_set(&conn->connection_reinstatement, 1);
4343 spin_unlock_bh(&conn->state_lock);
4344
4345 /*
4346 * If any other processes are accessing this connection pointer we
4347 * must wait until they have completed.
4348 */
4349 iscsit_check_conn_usage_count(conn);
4350
4351 if (conn->conn_rx_hash.tfm)
4352 crypto_free_hash(conn->conn_rx_hash.tfm);
4353 if (conn->conn_tx_hash.tfm)
4354 crypto_free_hash(conn->conn_tx_hash.tfm);
4355
4356 free_cpumask_var(conn->conn_cpumask);
4357
4358 kfree(conn->conn_ops);
4359 conn->conn_ops = NULL;
4360
4361 if (conn->sock)
4362 sock_release(conn->sock);
4363
4364 if (conn->conn_transport->iscsit_free_conn)
4365 conn->conn_transport->iscsit_free_conn(conn);
4366
4367 iscsit_put_transport(conn->conn_transport);
4368
4369 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4370 conn->conn_state = TARG_CONN_STATE_FREE;
4371 kfree(conn);
4372
4373 spin_lock_bh(&sess->conn_lock);
4374 atomic_dec(&sess->nconn);
4375 pr_debug("Decremented iSCSI connection count to %hu from node:"
4376 " %s\n", atomic_read(&sess->nconn),
4377 sess->sess_ops->InitiatorName);
4378 /*
4379 * Make sure that if one connection fails in an non ERL=2 iSCSI
4380 * Session that they all fail.
4381 */
4382 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4383 !atomic_read(&sess->session_logout))
4384 atomic_set(&sess->session_fall_back_to_erl0, 1);
4385
4386 /*
4387 * If this was not the last connection in the session, and we are
4388 * performing session reinstatement or falling back to ERL=0, call
4389 * iscsit_stop_session() without sleeping to shutdown the other
4390 * active connections.
4391 */
4392 if (atomic_read(&sess->nconn)) {
4393 if (!atomic_read(&sess->session_reinstatement) &&
4394 !atomic_read(&sess->session_fall_back_to_erl0)) {
4395 spin_unlock_bh(&sess->conn_lock);
4396 return 0;
4397 }
4398 if (!atomic_read(&sess->session_stop_active)) {
4399 atomic_set(&sess->session_stop_active, 1);
4400 spin_unlock_bh(&sess->conn_lock);
4401 iscsit_stop_session(sess, 0, 0);
4402 return 0;
4403 }
4404 spin_unlock_bh(&sess->conn_lock);
4405 return 0;
4406 }
4407
4408 /*
4409 * If this was the last connection in the session and one of the
4410 * following is occurring:
4411 *
4412 * Session Reinstatement is not being performed, and are falling back
4413 * to ERL=0 call iscsit_close_session().
4414 *
4415 * Session Logout was requested. iscsit_close_session() will be called
4416 * elsewhere.
4417 *
4418 * Session Continuation is not being performed, start the Time2Retain
4419 * handler and check if sleep_on_sess_wait_sem is active.
4420 */
4421 if (!atomic_read(&sess->session_reinstatement) &&
4422 atomic_read(&sess->session_fall_back_to_erl0)) {
4423 spin_unlock_bh(&sess->conn_lock);
4424 target_put_session(sess->se_sess);
4425
4426 return 0;
4427 } else if (atomic_read(&sess->session_logout)) {
4428 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4429 sess->session_state = TARG_SESS_STATE_FREE;
4430 spin_unlock_bh(&sess->conn_lock);
4431
4432 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4433 complete(&sess->session_wait_comp);
4434
4435 return 0;
4436 } else {
4437 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4438 sess->session_state = TARG_SESS_STATE_FAILED;
4439
4440 if (!atomic_read(&sess->session_continuation)) {
4441 spin_unlock_bh(&sess->conn_lock);
4442 iscsit_start_time2retain_handler(sess);
4443 } else
4444 spin_unlock_bh(&sess->conn_lock);
4445
4446 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4447 complete(&sess->session_wait_comp);
4448
4449 return 0;
4450 }
4451 spin_unlock_bh(&sess->conn_lock);
4452
4453 return 0;
4454 }
4455
4456 int iscsit_close_session(struct iscsi_session *sess)
4457 {
4458 struct iscsi_portal_group *tpg = sess->tpg;
4459 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4460
4461 if (atomic_read(&sess->nconn)) {
4462 pr_err("%d connection(s) still exist for iSCSI session"
4463 " to %s\n", atomic_read(&sess->nconn),
4464 sess->sess_ops->InitiatorName);
4465 BUG();
4466 }
4467
4468 spin_lock_bh(&se_tpg->session_lock);
4469 atomic_set(&sess->session_logout, 1);
4470 atomic_set(&sess->session_reinstatement, 1);
4471 iscsit_stop_time2retain_timer(sess);
4472 spin_unlock_bh(&se_tpg->session_lock);
4473
4474 /*
4475 * transport_deregister_session_configfs() will clear the
4476 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4477 * can be setting it again with __transport_register_session() in
4478 * iscsi_post_login_handler() again after the iscsit_stop_session()
4479 * completes in iscsi_np context.
4480 */
4481 transport_deregister_session_configfs(sess->se_sess);
4482
4483 /*
4484 * If any other processes are accessing this session pointer we must
4485 * wait until they have completed. If we are in an interrupt (the
4486 * time2retain handler) and contain and active session usage count we
4487 * restart the timer and exit.
4488 */
4489 if (!in_interrupt()) {
4490 if (iscsit_check_session_usage_count(sess) == 1)
4491 iscsit_stop_session(sess, 1, 1);
4492 } else {
4493 if (iscsit_check_session_usage_count(sess) == 2) {
4494 atomic_set(&sess->session_logout, 0);
4495 iscsit_start_time2retain_handler(sess);
4496 return 0;
4497 }
4498 }
4499
4500 transport_deregister_session(sess->se_sess);
4501
4502 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4503 iscsit_free_connection_recovery_entires(sess);
4504
4505 iscsit_free_all_ooo_cmdsns(sess);
4506
4507 spin_lock_bh(&se_tpg->session_lock);
4508 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4509 sess->session_state = TARG_SESS_STATE_FREE;
4510 pr_debug("Released iSCSI session from node: %s\n",
4511 sess->sess_ops->InitiatorName);
4512 tpg->nsessions--;
4513 if (tpg->tpg_tiqn)
4514 tpg->tpg_tiqn->tiqn_nsessions--;
4515
4516 pr_debug("Decremented number of active iSCSI Sessions on"
4517 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4518
4519 spin_lock(&sess_idr_lock);
4520 idr_remove(&sess_idr, sess->session_index);
4521 spin_unlock(&sess_idr_lock);
4522
4523 kfree(sess->sess_ops);
4524 sess->sess_ops = NULL;
4525 spin_unlock_bh(&se_tpg->session_lock);
4526
4527 kfree(sess);
4528 return 0;
4529 }
4530
4531 static void iscsit_logout_post_handler_closesession(
4532 struct iscsi_conn *conn)
4533 {
4534 struct iscsi_session *sess = conn->sess;
4535 int sleep = 1;
4536 /*
4537 * Traditional iscsi/tcp will invoke this logic from TX thread
4538 * context during session logout, so clear tx_thread_active and
4539 * sleep if iscsit_close_connection() has not already occured.
4540 *
4541 * Since iser-target invokes this logic from it's own workqueue,
4542 * always sleep waiting for RX/TX thread shutdown to complete
4543 * within iscsit_close_connection().
4544 */
4545 if (conn->conn_transport->transport_type == ISCSI_TCP)
4546 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4547
4548 atomic_set(&conn->conn_logout_remove, 0);
4549 complete(&conn->conn_logout_comp);
4550
4551 iscsit_dec_conn_usage_count(conn);
4552 iscsit_stop_session(sess, sleep, sleep);
4553 iscsit_dec_session_usage_count(sess);
4554 target_put_session(sess->se_sess);
4555 }
4556
4557 static void iscsit_logout_post_handler_samecid(
4558 struct iscsi_conn *conn)
4559 {
4560 int sleep = 1;
4561
4562 if (conn->conn_transport->transport_type == ISCSI_TCP)
4563 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4564
4565 atomic_set(&conn->conn_logout_remove, 0);
4566 complete(&conn->conn_logout_comp);
4567
4568 iscsit_cause_connection_reinstatement(conn, sleep);
4569 iscsit_dec_conn_usage_count(conn);
4570 }
4571
4572 static void iscsit_logout_post_handler_diffcid(
4573 struct iscsi_conn *conn,
4574 u16 cid)
4575 {
4576 struct iscsi_conn *l_conn;
4577 struct iscsi_session *sess = conn->sess;
4578 bool conn_found = false;
4579
4580 if (!sess)
4581 return;
4582
4583 spin_lock_bh(&sess->conn_lock);
4584 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4585 if (l_conn->cid == cid) {
4586 iscsit_inc_conn_usage_count(l_conn);
4587 conn_found = true;
4588 break;
4589 }
4590 }
4591 spin_unlock_bh(&sess->conn_lock);
4592
4593 if (!conn_found)
4594 return;
4595
4596 if (l_conn->sock)
4597 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4598
4599 spin_lock_bh(&l_conn->state_lock);
4600 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4601 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4602 spin_unlock_bh(&l_conn->state_lock);
4603
4604 iscsit_cause_connection_reinstatement(l_conn, 1);
4605 iscsit_dec_conn_usage_count(l_conn);
4606 }
4607
4608 /*
4609 * Return of 0 causes the TX thread to restart.
4610 */
4611 int iscsit_logout_post_handler(
4612 struct iscsi_cmd *cmd,
4613 struct iscsi_conn *conn)
4614 {
4615 int ret = 0;
4616
4617 switch (cmd->logout_reason) {
4618 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4619 switch (cmd->logout_response) {
4620 case ISCSI_LOGOUT_SUCCESS:
4621 case ISCSI_LOGOUT_CLEANUP_FAILED:
4622 default:
4623 iscsit_logout_post_handler_closesession(conn);
4624 break;
4625 }
4626 ret = 0;
4627 break;
4628 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4629 if (conn->cid == cmd->logout_cid) {
4630 switch (cmd->logout_response) {
4631 case ISCSI_LOGOUT_SUCCESS:
4632 case ISCSI_LOGOUT_CLEANUP_FAILED:
4633 default:
4634 iscsit_logout_post_handler_samecid(conn);
4635 break;
4636 }
4637 ret = 0;
4638 } else {
4639 switch (cmd->logout_response) {
4640 case ISCSI_LOGOUT_SUCCESS:
4641 iscsit_logout_post_handler_diffcid(conn,
4642 cmd->logout_cid);
4643 break;
4644 case ISCSI_LOGOUT_CID_NOT_FOUND:
4645 case ISCSI_LOGOUT_CLEANUP_FAILED:
4646 default:
4647 break;
4648 }
4649 ret = 1;
4650 }
4651 break;
4652 case ISCSI_LOGOUT_REASON_RECOVERY:
4653 switch (cmd->logout_response) {
4654 case ISCSI_LOGOUT_SUCCESS:
4655 case ISCSI_LOGOUT_CID_NOT_FOUND:
4656 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4657 case ISCSI_LOGOUT_CLEANUP_FAILED:
4658 default:
4659 break;
4660 }
4661 ret = 1;
4662 break;
4663 default:
4664 break;
4665
4666 }
4667 return ret;
4668 }
4669 EXPORT_SYMBOL(iscsit_logout_post_handler);
4670
4671 void iscsit_fail_session(struct iscsi_session *sess)
4672 {
4673 struct iscsi_conn *conn;
4674
4675 spin_lock_bh(&sess->conn_lock);
4676 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4677 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4678 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4679 }
4680 spin_unlock_bh(&sess->conn_lock);
4681
4682 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4683 sess->session_state = TARG_SESS_STATE_FAILED;
4684 }
4685
4686 int iscsit_free_session(struct iscsi_session *sess)
4687 {
4688 u16 conn_count = atomic_read(&sess->nconn);
4689 struct iscsi_conn *conn, *conn_tmp = NULL;
4690 int is_last;
4691
4692 spin_lock_bh(&sess->conn_lock);
4693 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4694
4695 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4696 conn_list) {
4697 if (conn_count == 0)
4698 break;
4699
4700 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4701 is_last = 1;
4702 } else {
4703 iscsit_inc_conn_usage_count(conn_tmp);
4704 is_last = 0;
4705 }
4706 iscsit_inc_conn_usage_count(conn);
4707
4708 spin_unlock_bh(&sess->conn_lock);
4709 iscsit_cause_connection_reinstatement(conn, 1);
4710 spin_lock_bh(&sess->conn_lock);
4711
4712 iscsit_dec_conn_usage_count(conn);
4713 if (is_last == 0)
4714 iscsit_dec_conn_usage_count(conn_tmp);
4715
4716 conn_count--;
4717 }
4718
4719 if (atomic_read(&sess->nconn)) {
4720 spin_unlock_bh(&sess->conn_lock);
4721 wait_for_completion(&sess->session_wait_comp);
4722 } else
4723 spin_unlock_bh(&sess->conn_lock);
4724
4725 target_put_session(sess->se_sess);
4726 return 0;
4727 }
4728
4729 void iscsit_stop_session(
4730 struct iscsi_session *sess,
4731 int session_sleep,
4732 int connection_sleep)
4733 {
4734 u16 conn_count = atomic_read(&sess->nconn);
4735 struct iscsi_conn *conn, *conn_tmp = NULL;
4736 int is_last;
4737
4738 spin_lock_bh(&sess->conn_lock);
4739 if (session_sleep)
4740 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4741
4742 if (connection_sleep) {
4743 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4744 conn_list) {
4745 if (conn_count == 0)
4746 break;
4747
4748 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4749 is_last = 1;
4750 } else {
4751 iscsit_inc_conn_usage_count(conn_tmp);
4752 is_last = 0;
4753 }
4754 iscsit_inc_conn_usage_count(conn);
4755
4756 spin_unlock_bh(&sess->conn_lock);
4757 iscsit_cause_connection_reinstatement(conn, 1);
4758 spin_lock_bh(&sess->conn_lock);
4759
4760 iscsit_dec_conn_usage_count(conn);
4761 if (is_last == 0)
4762 iscsit_dec_conn_usage_count(conn_tmp);
4763 conn_count--;
4764 }
4765 } else {
4766 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4767 iscsit_cause_connection_reinstatement(conn, 0);
4768 }
4769
4770 if (session_sleep && atomic_read(&sess->nconn)) {
4771 spin_unlock_bh(&sess->conn_lock);
4772 wait_for_completion(&sess->session_wait_comp);
4773 } else
4774 spin_unlock_bh(&sess->conn_lock);
4775 }
4776
4777 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4778 {
4779 struct iscsi_session *sess;
4780 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4781 struct se_session *se_sess, *se_sess_tmp;
4782 LIST_HEAD(free_list);
4783 int session_count = 0;
4784
4785 spin_lock_bh(&se_tpg->session_lock);
4786 if (tpg->nsessions && !force) {
4787 spin_unlock_bh(&se_tpg->session_lock);
4788 return -1;
4789 }
4790
4791 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4792 sess_list) {
4793 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4794
4795 spin_lock(&sess->conn_lock);
4796 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4797 atomic_read(&sess->session_logout) ||
4798 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4799 spin_unlock(&sess->conn_lock);
4800 continue;
4801 }
4802 atomic_set(&sess->session_reinstatement, 1);
4803 spin_unlock(&sess->conn_lock);
4804
4805 list_move_tail(&se_sess->sess_list, &free_list);
4806 }
4807 spin_unlock_bh(&se_tpg->session_lock);
4808
4809 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4810 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4811
4812 iscsit_free_session(sess);
4813 session_count++;
4814 }
4815
4816 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4817 " Group: %hu\n", session_count, tpg->tpgt);
4818 return 0;
4819 }
4820
4821 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4822 MODULE_VERSION("4.1.x");
4823 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4824 MODULE_LICENSE("GPL");
4825
4826 module_init(iscsi_target_init_module);
4827 module_exit(iscsi_target_cleanup_module);
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