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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / drivers / target / iscsi / iscsi_target.c
blob961202f4e9aa4a2004f85d89f7a8a638f3898814
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 <crypto/hash.h>
20 #include <linux/string.h>
21 #include <linux/kthread.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 ahash_request *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_ahash_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 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1213 crypto_ahash_update(hash);
1214
1215 data_length -= cur_len;
1216 page_off = 0;
1217 /* iscsit_map_iovec has already checked for invalid sg pointers */
1218 sg = sg_next(sg);
1219 }
1220
1221 if (padding) {
1222 struct scatterlist pad_sg;
1223
1224 sg_init_one(&pad_sg, pad_bytes, padding);
1225 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1226 padding);
1227 crypto_ahash_finup(hash);
1228 } else {
1229 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1230 crypto_ahash_final(hash);
1231 }
1232
1233 return data_crc;
1234 }
1235
1236 static void iscsit_do_crypto_hash_buf(
1237 struct ahash_request *hash,
1238 const void *buf,
1239 u32 payload_length,
1240 u32 padding,
1241 u8 *pad_bytes,
1242 u8 *data_crc)
1243 {
1244 struct scatterlist sg[2];
1245
1246 sg_init_table(sg, ARRAY_SIZE(sg));
1247 sg_set_buf(sg, buf, payload_length);
1248 sg_set_buf(sg + 1, pad_bytes, padding);
1249
1250 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1251
1252 crypto_ahash_digest(hash);
1253 }
1254
1255 int
1256 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1257 struct iscsi_cmd **out_cmd)
1258 {
1259 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1260 struct iscsi_cmd *cmd = NULL;
1261 struct se_cmd *se_cmd;
1262 u32 payload_length = ntoh24(hdr->dlength);
1263 int rc;
1264
1265 if (!payload_length) {
1266 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1267 return 0;
1268 }
1269
1270 /* iSCSI write */
1271 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1272
1273 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1274 pr_err("DataSegmentLength: %u is greater than"
1275 " MaxXmitDataSegmentLength: %u\n", payload_length,
1276 conn->conn_ops->MaxXmitDataSegmentLength);
1277 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1278 buf);
1279 }
1280
1281 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1282 payload_length);
1283 if (!cmd)
1284 return 0;
1285
1286 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1287 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1288 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1289 payload_length, conn->cid);
1290
1291 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1292 pr_err("Command ITT: 0x%08x received DataOUT after"
1293 " last DataOUT received, dumping payload\n",
1294 cmd->init_task_tag);
1295 return iscsit_dump_data_payload(conn, payload_length, 1);
1296 }
1297
1298 if (cmd->data_direction != DMA_TO_DEVICE) {
1299 pr_err("Command ITT: 0x%08x received DataOUT for a"
1300 " NON-WRITE command.\n", cmd->init_task_tag);
1301 return iscsit_dump_data_payload(conn, payload_length, 1);
1302 }
1303 se_cmd = &cmd->se_cmd;
1304 iscsit_mod_dataout_timer(cmd);
1305
1306 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1307 pr_err("DataOut Offset: %u, Length %u greater than"
1308 " iSCSI Command EDTL %u, protocol error.\n",
1309 hdr->offset, payload_length, cmd->se_cmd.data_length);
1310 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1311 }
1312
1313 if (cmd->unsolicited_data) {
1314 int dump_unsolicited_data = 0;
1315
1316 if (conn->sess->sess_ops->InitialR2T) {
1317 pr_err("Received unexpected unsolicited data"
1318 " while InitialR2T=Yes, protocol error.\n");
1319 transport_send_check_condition_and_sense(&cmd->se_cmd,
1320 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1321 return -1;
1322 }
1323 /*
1324 * Special case for dealing with Unsolicited DataOUT
1325 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1326 * failures;
1327 */
1328
1329 /* Something's amiss if we're not in WRITE_PENDING state... */
1330 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1331 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1332 dump_unsolicited_data = 1;
1333
1334 if (dump_unsolicited_data) {
1335 /*
1336 * Check if a delayed TASK_ABORTED status needs to
1337 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1338 * received with the unsolicited data out.
1339 */
1340 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1341 iscsit_stop_dataout_timer(cmd);
1342
1343 transport_check_aborted_status(se_cmd,
1344 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1345 return iscsit_dump_data_payload(conn, payload_length, 1);
1346 }
1347 } else {
1348 /*
1349 * For the normal solicited data path:
1350 *
1351 * Check for a delayed TASK_ABORTED status and dump any
1352 * incoming data out payload if one exists. Also, when the
1353 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1354 * data out sequence, we decrement outstanding_r2ts. Once
1355 * outstanding_r2ts reaches zero, go ahead and send the delayed
1356 * TASK_ABORTED status.
1357 */
1358 if (se_cmd->transport_state & CMD_T_ABORTED) {
1359 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1360 if (--cmd->outstanding_r2ts < 1) {
1361 iscsit_stop_dataout_timer(cmd);
1362 transport_check_aborted_status(
1363 se_cmd, 1);
1364 }
1365
1366 return iscsit_dump_data_payload(conn, payload_length, 1);
1367 }
1368 }
1369 /*
1370 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1371 * within-command recovery checks before receiving the payload.
1372 */
1373 rc = iscsit_check_pre_dataout(cmd, buf);
1374 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1375 return 0;
1376 else if (rc == DATAOUT_CANNOT_RECOVER)
1377 return -1;
1378
1379 *out_cmd = cmd;
1380 return 0;
1381 }
1382 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1383
1384 static int
1385 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1386 struct iscsi_data *hdr)
1387 {
1388 struct kvec *iov;
1389 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1390 u32 payload_length = ntoh24(hdr->dlength);
1391 int iov_ret, data_crc_failed = 0;
1392
1393 rx_size += payload_length;
1394 iov = &cmd->iov_data[0];
1395
1396 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1397 payload_length);
1398 if (iov_ret < 0)
1399 return -1;
1400
1401 iov_count += iov_ret;
1402
1403 padding = ((-payload_length) & 3);
1404 if (padding != 0) {
1405 iov[iov_count].iov_base = cmd->pad_bytes;
1406 iov[iov_count++].iov_len = padding;
1407 rx_size += padding;
1408 pr_debug("Receiving %u padding bytes.\n", padding);
1409 }
1410
1411 if (conn->conn_ops->DataDigest) {
1412 iov[iov_count].iov_base = &checksum;
1413 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1414 rx_size += ISCSI_CRC_LEN;
1415 }
1416
1417 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1418
1419 iscsit_unmap_iovec(cmd);
1420
1421 if (rx_got != rx_size)
1422 return -1;
1423
1424 if (conn->conn_ops->DataDigest) {
1425 u32 data_crc;
1426
1427 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1428 be32_to_cpu(hdr->offset),
1429 payload_length, padding,
1430 cmd->pad_bytes);
1431
1432 if (checksum != data_crc) {
1433 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1434 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1435 " does not match computed 0x%08x\n",
1436 hdr->itt, hdr->offset, payload_length,
1437 hdr->datasn, checksum, data_crc);
1438 data_crc_failed = 1;
1439 } else {
1440 pr_debug("Got CRC32C DataDigest 0x%08x for"
1441 " %u bytes of Data Out\n", checksum,
1442 payload_length);
1443 }
1444 }
1445
1446 return data_crc_failed;
1447 }
1448
1449 int
1450 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1451 bool data_crc_failed)
1452 {
1453 struct iscsi_conn *conn = cmd->conn;
1454 int rc, ooo_cmdsn;
1455 /*
1456 * Increment post receive data and CRC values or perform
1457 * within-command recovery.
1458 */
1459 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1460 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1461 return 0;
1462 else if (rc == DATAOUT_SEND_R2T) {
1463 iscsit_set_dataout_sequence_values(cmd);
1464 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1465 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1466 /*
1467 * Handle extra special case for out of order
1468 * Unsolicited Data Out.
1469 */
1470 spin_lock_bh(&cmd->istate_lock);
1471 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1472 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1473 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1474 spin_unlock_bh(&cmd->istate_lock);
1475
1476 iscsit_stop_dataout_timer(cmd);
1477 if (ooo_cmdsn)
1478 return 0;
1479 target_execute_cmd(&cmd->se_cmd);
1480 return 0;
1481 } else /* DATAOUT_CANNOT_RECOVER */
1482 return -1;
1483
1484 return 0;
1485 }
1486 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1487
1488 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1489 {
1490 struct iscsi_cmd *cmd = NULL;
1491 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1492 int rc;
1493 bool data_crc_failed = false;
1494
1495 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1496 if (rc < 0)
1497 return 0;
1498 else if (!cmd)
1499 return 0;
1500
1501 rc = iscsit_get_dataout(conn, cmd, hdr);
1502 if (rc < 0)
1503 return rc;
1504 else if (rc > 0)
1505 data_crc_failed = true;
1506
1507 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1508 }
1509
1510 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1511 struct iscsi_nopout *hdr)
1512 {
1513 u32 payload_length = ntoh24(hdr->dlength);
1514
1515 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1516 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1517 if (!cmd)
1518 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1519 (unsigned char *)hdr);
1520
1521 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1522 (unsigned char *)hdr);
1523 }
1524
1525 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1526 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1527 " not set, protocol error.\n");
1528 if (!cmd)
1529 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1530 (unsigned char *)hdr);
1531
1532 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1533 (unsigned char *)hdr);
1534 }
1535
1536 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1537 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1538 " greater than MaxXmitDataSegmentLength: %u, protocol"
1539 " error.\n", payload_length,
1540 conn->conn_ops->MaxXmitDataSegmentLength);
1541 if (!cmd)
1542 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1543 (unsigned char *)hdr);
1544
1545 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1546 (unsigned char *)hdr);
1547 }
1548
1549 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1550 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1551 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1552 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1553 payload_length);
1554 /*
1555 * This is not a response to a Unsolicited NopIN, which means
1556 * it can either be a NOPOUT ping request (with a valid ITT),
1557 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1558 * Either way, make sure we allocate an struct iscsi_cmd, as both
1559 * can contain ping data.
1560 */
1561 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1562 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1563 cmd->i_state = ISTATE_SEND_NOPIN;
1564 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1565 1 : 0);
1566 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1567 cmd->targ_xfer_tag = 0xFFFFFFFF;
1568 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1569 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1570 cmd->data_direction = DMA_NONE;
1571 }
1572
1573 return 0;
1574 }
1575 EXPORT_SYMBOL(iscsit_setup_nop_out);
1576
1577 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1578 struct iscsi_nopout *hdr)
1579 {
1580 struct iscsi_cmd *cmd_p = NULL;
1581 int cmdsn_ret = 0;
1582 /*
1583 * Initiator is expecting a NopIN ping reply..
1584 */
1585 if (hdr->itt != RESERVED_ITT) {
1586 if (!cmd)
1587 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1588 (unsigned char *)hdr);
1589
1590 spin_lock_bh(&conn->cmd_lock);
1591 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1592 spin_unlock_bh(&conn->cmd_lock);
1593
1594 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1595
1596 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1597 iscsit_add_cmd_to_response_queue(cmd, conn,
1598 cmd->i_state);
1599 return 0;
1600 }
1601
1602 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1603 (unsigned char *)hdr, hdr->cmdsn);
1604 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1605 return 0;
1606 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1607 return -1;
1608
1609 return 0;
1610 }
1611 /*
1612 * This was a response to a unsolicited NOPIN ping.
1613 */
1614 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1615 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1616 if (!cmd_p)
1617 return -EINVAL;
1618
1619 iscsit_stop_nopin_response_timer(conn);
1620
1621 cmd_p->i_state = ISTATE_REMOVE;
1622 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1623
1624 iscsit_start_nopin_timer(conn);
1625 return 0;
1626 }
1627 /*
1628 * Otherwise, initiator is not expecting a NOPIN is response.
1629 * Just ignore for now.
1630 */
1631 return 0;
1632 }
1633 EXPORT_SYMBOL(iscsit_process_nop_out);
1634
1635 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1636 unsigned char *buf)
1637 {
1638 unsigned char *ping_data = NULL;
1639 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1640 struct kvec *iov = NULL;
1641 u32 payload_length = ntoh24(hdr->dlength);
1642 int ret;
1643
1644 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1645 if (ret < 0)
1646 return 0;
1647 /*
1648 * Handle NOP-OUT payload for traditional iSCSI sockets
1649 */
1650 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1651 u32 checksum, data_crc, padding = 0;
1652 int niov = 0, rx_got, rx_size = payload_length;
1653
1654 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1655 if (!ping_data) {
1656 pr_err("Unable to allocate memory for"
1657 " NOPOUT ping data.\n");
1658 ret = -1;
1659 goto out;
1660 }
1661
1662 iov = &cmd->iov_misc[0];
1663 iov[niov].iov_base = ping_data;
1664 iov[niov++].iov_len = payload_length;
1665
1666 padding = ((-payload_length) & 3);
1667 if (padding != 0) {
1668 pr_debug("Receiving %u additional bytes"
1669 " for padding.\n", padding);
1670 iov[niov].iov_base = &cmd->pad_bytes;
1671 iov[niov++].iov_len = padding;
1672 rx_size += padding;
1673 }
1674 if (conn->conn_ops->DataDigest) {
1675 iov[niov].iov_base = &checksum;
1676 iov[niov++].iov_len = ISCSI_CRC_LEN;
1677 rx_size += ISCSI_CRC_LEN;
1678 }
1679
1680 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1681 if (rx_got != rx_size) {
1682 ret = -1;
1683 goto out;
1684 }
1685
1686 if (conn->conn_ops->DataDigest) {
1687 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1688 ping_data, payload_length,
1689 padding, cmd->pad_bytes,
1690 (u8 *)&data_crc);
1691
1692 if (checksum != data_crc) {
1693 pr_err("Ping data CRC32C DataDigest"
1694 " 0x%08x does not match computed 0x%08x\n",
1695 checksum, data_crc);
1696 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1697 pr_err("Unable to recover from"
1698 " NOPOUT Ping DataCRC failure while in"
1699 " ERL=0.\n");
1700 ret = -1;
1701 goto out;
1702 } else {
1703 /*
1704 * Silently drop this PDU and let the
1705 * initiator plug the CmdSN gap.
1706 */
1707 pr_debug("Dropping NOPOUT"
1708 " Command CmdSN: 0x%08x due to"
1709 " DataCRC error.\n", hdr->cmdsn);
1710 ret = 0;
1711 goto out;
1712 }
1713 } else {
1714 pr_debug("Got CRC32C DataDigest"
1715 " 0x%08x for %u bytes of ping data.\n",
1716 checksum, payload_length);
1717 }
1718 }
1719
1720 ping_data[payload_length] = '\0';
1721 /*
1722 * Attach ping data to struct iscsi_cmd->buf_ptr.
1723 */
1724 cmd->buf_ptr = ping_data;
1725 cmd->buf_ptr_size = payload_length;
1726
1727 pr_debug("Got %u bytes of NOPOUT ping"
1728 " data.\n", payload_length);
1729 pr_debug("Ping Data: \"%s\"\n", ping_data);
1730 }
1731
1732 return iscsit_process_nop_out(conn, cmd, hdr);
1733 out:
1734 if (cmd)
1735 iscsit_free_cmd(cmd, false);
1736
1737 kfree(ping_data);
1738 return ret;
1739 }
1740
1741 int
1742 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1743 unsigned char *buf)
1744 {
1745 struct se_tmr_req *se_tmr;
1746 struct iscsi_tmr_req *tmr_req;
1747 struct iscsi_tm *hdr;
1748 int out_of_order_cmdsn = 0, ret;
1749 bool sess_ref = false;
1750 u8 function;
1751
1752 hdr = (struct iscsi_tm *) buf;
1753 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1754 function = hdr->flags;
1755
1756 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1757 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1758 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1759 hdr->rtt, hdr->refcmdsn, conn->cid);
1760
1761 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1762 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1763 hdr->rtt != RESERVED_ITT)) {
1764 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1765 hdr->rtt = RESERVED_ITT;
1766 }
1767
1768 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1769 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1770 pr_err("Task Management Request TASK_REASSIGN not"
1771 " issued as immediate command, bad iSCSI Initiator"
1772 "implementation\n");
1773 return iscsit_add_reject_cmd(cmd,
1774 ISCSI_REASON_PROTOCOL_ERROR, buf);
1775 }
1776 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1777 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1778 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1779
1780 cmd->data_direction = DMA_NONE;
1781
1782 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1783 if (!cmd->tmr_req) {
1784 pr_err("Unable to allocate memory for"
1785 " Task Management command!\n");
1786 return iscsit_add_reject_cmd(cmd,
1787 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1788 buf);
1789 }
1790
1791 /*
1792 * TASK_REASSIGN for ERL=2 / connection stays inside of
1793 * LIO-Target $FABRIC_MOD
1794 */
1795 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1796
1797 u8 tcm_function;
1798 int ret;
1799
1800 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1801 conn->sess->se_sess, 0, DMA_NONE,
1802 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1803
1804 target_get_sess_cmd(&cmd->se_cmd, true);
1805 sess_ref = true;
1806
1807 switch (function) {
1808 case ISCSI_TM_FUNC_ABORT_TASK:
1809 tcm_function = TMR_ABORT_TASK;
1810 break;
1811 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1812 tcm_function = TMR_ABORT_TASK_SET;
1813 break;
1814 case ISCSI_TM_FUNC_CLEAR_ACA:
1815 tcm_function = TMR_CLEAR_ACA;
1816 break;
1817 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1818 tcm_function = TMR_CLEAR_TASK_SET;
1819 break;
1820 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1821 tcm_function = TMR_LUN_RESET;
1822 break;
1823 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1824 tcm_function = TMR_TARGET_WARM_RESET;
1825 break;
1826 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1827 tcm_function = TMR_TARGET_COLD_RESET;
1828 break;
1829 default:
1830 pr_err("Unknown iSCSI TMR Function:"
1831 " 0x%02x\n", function);
1832 return iscsit_add_reject_cmd(cmd,
1833 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1834 }
1835
1836 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1837 tcm_function, GFP_KERNEL);
1838 if (ret < 0)
1839 return iscsit_add_reject_cmd(cmd,
1840 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1841
1842 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1843 }
1844
1845 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1846 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1847 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1848 cmd->init_task_tag = hdr->itt;
1849 cmd->targ_xfer_tag = 0xFFFFFFFF;
1850 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1851 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1852 se_tmr = cmd->se_cmd.se_tmr_req;
1853 tmr_req = cmd->tmr_req;
1854 /*
1855 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1856 */
1857 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1858 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1859 scsilun_to_int(&hdr->lun));
1860 if (ret < 0) {
1861 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1862 goto attach;
1863 }
1864 }
1865
1866 switch (function) {
1867 case ISCSI_TM_FUNC_ABORT_TASK:
1868 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1869 if (se_tmr->response)
1870 goto attach;
1871 break;
1872 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1873 case ISCSI_TM_FUNC_CLEAR_ACA:
1874 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1875 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1876 break;
1877 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1878 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1879 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1880 goto attach;
1881 }
1882 break;
1883 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1884 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1885 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1886 goto attach;
1887 }
1888 break;
1889 case ISCSI_TM_FUNC_TASK_REASSIGN:
1890 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1891 /*
1892 * Perform sanity checks on the ExpDataSN only if the
1893 * TASK_REASSIGN was successful.
1894 */
1895 if (se_tmr->response)
1896 break;
1897
1898 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1899 return iscsit_add_reject_cmd(cmd,
1900 ISCSI_REASON_BOOKMARK_INVALID, buf);
1901 break;
1902 default:
1903 pr_err("Unknown TMR function: 0x%02x, protocol"
1904 " error.\n", function);
1905 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1906 goto attach;
1907 }
1908
1909 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1910 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1911 se_tmr->call_transport = 1;
1912 attach:
1913 spin_lock_bh(&conn->cmd_lock);
1914 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1915 spin_unlock_bh(&conn->cmd_lock);
1916
1917 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1918 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1919 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1920 out_of_order_cmdsn = 1;
1921 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1922 return 0;
1923 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1924 return -1;
1925 }
1926 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1927
1928 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1929 return 0;
1930 /*
1931 * Found the referenced task, send to transport for processing.
1932 */
1933 if (se_tmr->call_transport)
1934 return transport_generic_handle_tmr(&cmd->se_cmd);
1935
1936 /*
1937 * Could not find the referenced LUN, task, or Task Management
1938 * command not authorized or supported. Change state and
1939 * let the tx_thread send the response.
1940 *
1941 * For connection recovery, this is also the default action for
1942 * TMR TASK_REASSIGN.
1943 */
1944 if (sess_ref) {
1945 pr_debug("Handle TMR, using sess_ref=true check\n");
1946 target_put_sess_cmd(&cmd->se_cmd);
1947 }
1948
1949 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1950 return 0;
1951 }
1952 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1953
1954 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1955 int
1956 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1957 struct iscsi_text *hdr)
1958 {
1959 u32 payload_length = ntoh24(hdr->dlength);
1960
1961 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1962 pr_err("Unable to accept text parameter length: %u"
1963 "greater than MaxXmitDataSegmentLength %u.\n",
1964 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1965 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1966 (unsigned char *)hdr);
1967 }
1968
1969 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1970 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1971 pr_err("Multi sequence text commands currently not supported\n");
1972 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1973 (unsigned char *)hdr);
1974 }
1975
1976 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1977 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1978 hdr->exp_statsn, payload_length);
1979
1980 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1981 cmd->i_state = ISTATE_SEND_TEXTRSP;
1982 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1983 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1984 cmd->targ_xfer_tag = 0xFFFFFFFF;
1985 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1986 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1987 cmd->data_direction = DMA_NONE;
1988 cmd->text_in_ptr = NULL;
1989
1990 return 0;
1991 }
1992 EXPORT_SYMBOL(iscsit_setup_text_cmd);
1993
1994 int
1995 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1996 struct iscsi_text *hdr)
1997 {
1998 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
1999 int cmdsn_ret;
2000
2001 if (!text_in) {
2002 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2003 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2004 pr_err("Unable to locate text_in buffer for sendtargets"
2005 " discovery\n");
2006 goto reject;
2007 }
2008 goto empty_sendtargets;
2009 }
2010 if (strncmp("SendTargets", text_in, 11) != 0) {
2011 pr_err("Received Text Data that is not"
2012 " SendTargets, cannot continue.\n");
2013 goto reject;
2014 }
2015 text_ptr = strchr(text_in, '=');
2016 if (!text_ptr) {
2017 pr_err("No \"=\" separator found in Text Data,"
2018 " cannot continue.\n");
2019 goto reject;
2020 }
2021 if (!strncmp("=All", text_ptr, 4)) {
2022 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2023 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2024 !strncmp("=eui.", text_ptr, 5)) {
2025 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2026 } else {
2027 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2028 goto reject;
2029 }
2030
2031 spin_lock_bh(&conn->cmd_lock);
2032 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2033 spin_unlock_bh(&conn->cmd_lock);
2034
2035 empty_sendtargets:
2036 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2037
2038 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2039 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2040 (unsigned char *)hdr, hdr->cmdsn);
2041 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2042 return -1;
2043
2044 return 0;
2045 }
2046
2047 return iscsit_execute_cmd(cmd, 0);
2048
2049 reject:
2050 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2051 (unsigned char *)hdr);
2052 }
2053 EXPORT_SYMBOL(iscsit_process_text_cmd);
2054
2055 static int
2056 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2057 unsigned char *buf)
2058 {
2059 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2060 char *text_in = NULL;
2061 u32 payload_length = ntoh24(hdr->dlength);
2062 int rx_size, rc;
2063
2064 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2065 if (rc < 0)
2066 return 0;
2067
2068 rx_size = payload_length;
2069 if (payload_length) {
2070 u32 checksum = 0, data_crc = 0;
2071 u32 padding = 0, pad_bytes = 0;
2072 int niov = 0, rx_got;
2073 struct kvec iov[3];
2074
2075 text_in = kzalloc(payload_length, GFP_KERNEL);
2076 if (!text_in) {
2077 pr_err("Unable to allocate memory for"
2078 " incoming text parameters\n");
2079 goto reject;
2080 }
2081 cmd->text_in_ptr = text_in;
2082
2083 memset(iov, 0, 3 * sizeof(struct kvec));
2084 iov[niov].iov_base = text_in;
2085 iov[niov++].iov_len = payload_length;
2086
2087 padding = ((-payload_length) & 3);
2088 if (padding != 0) {
2089 iov[niov].iov_base = &pad_bytes;
2090 iov[niov++].iov_len = padding;
2091 rx_size += padding;
2092 pr_debug("Receiving %u additional bytes"
2093 " for padding.\n", padding);
2094 }
2095 if (conn->conn_ops->DataDigest) {
2096 iov[niov].iov_base = &checksum;
2097 iov[niov++].iov_len = ISCSI_CRC_LEN;
2098 rx_size += ISCSI_CRC_LEN;
2099 }
2100
2101 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2102 if (rx_got != rx_size)
2103 goto reject;
2104
2105 if (conn->conn_ops->DataDigest) {
2106 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2107 text_in, payload_length,
2108 padding, (u8 *)&pad_bytes,
2109 (u8 *)&data_crc);
2110
2111 if (checksum != data_crc) {
2112 pr_err("Text data CRC32C DataDigest"
2113 " 0x%08x does not match computed"
2114 " 0x%08x\n", checksum, data_crc);
2115 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2116 pr_err("Unable to recover from"
2117 " Text Data digest failure while in"
2118 " ERL=0.\n");
2119 goto reject;
2120 } else {
2121 /*
2122 * Silently drop this PDU and let the
2123 * initiator plug the CmdSN gap.
2124 */
2125 pr_debug("Dropping Text"
2126 " Command CmdSN: 0x%08x due to"
2127 " DataCRC error.\n", hdr->cmdsn);
2128 kfree(text_in);
2129 return 0;
2130 }
2131 } else {
2132 pr_debug("Got CRC32C DataDigest"
2133 " 0x%08x for %u bytes of text data.\n",
2134 checksum, payload_length);
2135 }
2136 }
2137 text_in[payload_length - 1] = '\0';
2138 pr_debug("Successfully read %d bytes of text"
2139 " data.\n", payload_length);
2140 }
2141
2142 return iscsit_process_text_cmd(conn, cmd, hdr);
2143
2144 reject:
2145 kfree(cmd->text_in_ptr);
2146 cmd->text_in_ptr = NULL;
2147 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2148 }
2149
2150 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2151 {
2152 struct iscsi_conn *conn_p;
2153 struct iscsi_session *sess = conn->sess;
2154
2155 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2156 " for SID: %u.\n", conn->cid, conn->sess->sid);
2157
2158 atomic_set(&sess->session_logout, 1);
2159 atomic_set(&conn->conn_logout_remove, 1);
2160 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2161
2162 iscsit_inc_conn_usage_count(conn);
2163 iscsit_inc_session_usage_count(sess);
2164
2165 spin_lock_bh(&sess->conn_lock);
2166 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2167 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2168 continue;
2169
2170 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2171 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2172 }
2173 spin_unlock_bh(&sess->conn_lock);
2174
2175 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2176
2177 return 0;
2178 }
2179
2180 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2181 {
2182 struct iscsi_conn *l_conn;
2183 struct iscsi_session *sess = conn->sess;
2184
2185 pr_debug("Received logout request CLOSECONNECTION for CID:"
2186 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2187
2188 /*
2189 * A Logout Request with a CLOSECONNECTION reason code for a CID
2190 * can arrive on a connection with a differing CID.
2191 */
2192 if (conn->cid == cmd->logout_cid) {
2193 spin_lock_bh(&conn->state_lock);
2194 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2195 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2196
2197 atomic_set(&conn->conn_logout_remove, 1);
2198 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2199 iscsit_inc_conn_usage_count(conn);
2200
2201 spin_unlock_bh(&conn->state_lock);
2202 } else {
2203 /*
2204 * Handle all different cid CLOSECONNECTION requests in
2205 * iscsit_logout_post_handler_diffcid() as to give enough
2206 * time for any non immediate command's CmdSN to be
2207 * acknowledged on the connection in question.
2208 *
2209 * Here we simply make sure the CID is still around.
2210 */
2211 l_conn = iscsit_get_conn_from_cid(sess,
2212 cmd->logout_cid);
2213 if (!l_conn) {
2214 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2215 iscsit_add_cmd_to_response_queue(cmd, conn,
2216 cmd->i_state);
2217 return 0;
2218 }
2219
2220 iscsit_dec_conn_usage_count(l_conn);
2221 }
2222
2223 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2224
2225 return 0;
2226 }
2227
2228 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2229 {
2230 struct iscsi_session *sess = conn->sess;
2231
2232 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2233 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2234
2235 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2236 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2237 " while ERL!=2.\n");
2238 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2239 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2240 return 0;
2241 }
2242
2243 if (conn->cid == cmd->logout_cid) {
2244 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2245 " with CID: %hu on CID: %hu, implementation error.\n",
2246 cmd->logout_cid, conn->cid);
2247 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2248 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2249 return 0;
2250 }
2251
2252 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2253
2254 return 0;
2255 }
2256
2257 int
2258 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2259 unsigned char *buf)
2260 {
2261 int cmdsn_ret, logout_remove = 0;
2262 u8 reason_code = 0;
2263 struct iscsi_logout *hdr;
2264 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2265
2266 hdr = (struct iscsi_logout *) buf;
2267 reason_code = (hdr->flags & 0x7f);
2268
2269 if (tiqn) {
2270 spin_lock(&tiqn->logout_stats.lock);
2271 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2272 tiqn->logout_stats.normal_logouts++;
2273 else
2274 tiqn->logout_stats.abnormal_logouts++;
2275 spin_unlock(&tiqn->logout_stats.lock);
2276 }
2277
2278 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2279 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2280 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2281 hdr->cid, conn->cid);
2282
2283 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2284 pr_err("Received logout request on connection that"
2285 " is not in logged in state, ignoring request.\n");
2286 iscsit_free_cmd(cmd, false);
2287 return 0;
2288 }
2289
2290 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2291 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2292 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2293 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2294 cmd->targ_xfer_tag = 0xFFFFFFFF;
2295 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2296 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2297 cmd->logout_cid = be16_to_cpu(hdr->cid);
2298 cmd->logout_reason = reason_code;
2299 cmd->data_direction = DMA_NONE;
2300
2301 /*
2302 * We need to sleep in these cases (by returning 1) until the Logout
2303 * Response gets sent in the tx thread.
2304 */
2305 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2306 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2307 be16_to_cpu(hdr->cid) == conn->cid))
2308 logout_remove = 1;
2309
2310 spin_lock_bh(&conn->cmd_lock);
2311 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2312 spin_unlock_bh(&conn->cmd_lock);
2313
2314 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2315 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2316
2317 /*
2318 * Immediate commands are executed, well, immediately.
2319 * Non-Immediate Logout Commands are executed in CmdSN order.
2320 */
2321 if (cmd->immediate_cmd) {
2322 int ret = iscsit_execute_cmd(cmd, 0);
2323
2324 if (ret < 0)
2325 return ret;
2326 } else {
2327 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2328 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2329 logout_remove = 0;
2330 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2331 return -1;
2332 }
2333
2334 return logout_remove;
2335 }
2336 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2337
2338 static int iscsit_handle_snack(
2339 struct iscsi_conn *conn,
2340 unsigned char *buf)
2341 {
2342 struct iscsi_snack *hdr;
2343
2344 hdr = (struct iscsi_snack *) buf;
2345 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2346
2347 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2348 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2349 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2350 hdr->begrun, hdr->runlength, conn->cid);
2351
2352 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2353 pr_err("Initiator sent SNACK request while in"
2354 " ErrorRecoveryLevel=0.\n");
2355 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2356 buf);
2357 }
2358 /*
2359 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2360 * call from inside iscsi_send_recovery_datain_or_r2t().
2361 */
2362 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2363 case 0:
2364 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2365 hdr->itt,
2366 be32_to_cpu(hdr->ttt),
2367 be32_to_cpu(hdr->begrun),
2368 be32_to_cpu(hdr->runlength));
2369 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2370 return iscsit_handle_status_snack(conn, hdr->itt,
2371 be32_to_cpu(hdr->ttt),
2372 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2373 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2374 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2375 be32_to_cpu(hdr->begrun),
2376 be32_to_cpu(hdr->runlength));
2377 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2378 /* FIXME: Support R-Data SNACK */
2379 pr_err("R-Data SNACK Not Supported.\n");
2380 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2381 buf);
2382 default:
2383 pr_err("Unknown SNACK type 0x%02x, protocol"
2384 " error.\n", hdr->flags & 0x0f);
2385 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2386 buf);
2387 }
2388
2389 return 0;
2390 }
2391
2392 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2393 {
2394 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2395 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2396 wait_for_completion_interruptible_timeout(
2397 &conn->rx_half_close_comp,
2398 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2399 }
2400 }
2401
2402 static int iscsit_handle_immediate_data(
2403 struct iscsi_cmd *cmd,
2404 struct iscsi_scsi_req *hdr,
2405 u32 length)
2406 {
2407 int iov_ret, rx_got = 0, rx_size = 0;
2408 u32 checksum, iov_count = 0, padding = 0;
2409 struct iscsi_conn *conn = cmd->conn;
2410 struct kvec *iov;
2411
2412 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2413 if (iov_ret < 0)
2414 return IMMEDIATE_DATA_CANNOT_RECOVER;
2415
2416 rx_size = length;
2417 iov_count = iov_ret;
2418 iov = &cmd->iov_data[0];
2419
2420 padding = ((-length) & 3);
2421 if (padding != 0) {
2422 iov[iov_count].iov_base = cmd->pad_bytes;
2423 iov[iov_count++].iov_len = padding;
2424 rx_size += padding;
2425 }
2426
2427 if (conn->conn_ops->DataDigest) {
2428 iov[iov_count].iov_base = &checksum;
2429 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2430 rx_size += ISCSI_CRC_LEN;
2431 }
2432
2433 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2434
2435 iscsit_unmap_iovec(cmd);
2436
2437 if (rx_got != rx_size) {
2438 iscsit_rx_thread_wait_for_tcp(conn);
2439 return IMMEDIATE_DATA_CANNOT_RECOVER;
2440 }
2441
2442 if (conn->conn_ops->DataDigest) {
2443 u32 data_crc;
2444
2445 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2446 cmd->write_data_done, length, padding,
2447 cmd->pad_bytes);
2448
2449 if (checksum != data_crc) {
2450 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2451 " does not match computed 0x%08x\n", checksum,
2452 data_crc);
2453
2454 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2455 pr_err("Unable to recover from"
2456 " Immediate Data digest failure while"
2457 " in ERL=0.\n");
2458 iscsit_reject_cmd(cmd,
2459 ISCSI_REASON_DATA_DIGEST_ERROR,
2460 (unsigned char *)hdr);
2461 return IMMEDIATE_DATA_CANNOT_RECOVER;
2462 } else {
2463 iscsit_reject_cmd(cmd,
2464 ISCSI_REASON_DATA_DIGEST_ERROR,
2465 (unsigned char *)hdr);
2466 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2467 }
2468 } else {
2469 pr_debug("Got CRC32C DataDigest 0x%08x for"
2470 " %u bytes of Immediate Data\n", checksum,
2471 length);
2472 }
2473 }
2474
2475 cmd->write_data_done += length;
2476
2477 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2478 spin_lock_bh(&cmd->istate_lock);
2479 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2480 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2481 spin_unlock_bh(&cmd->istate_lock);
2482 }
2483
2484 return IMMEDIATE_DATA_NORMAL_OPERATION;
2485 }
2486
2487 /*
2488 * Called with sess->conn_lock held.
2489 */
2490 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2491 with active network interface */
2492 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2493 {
2494 struct iscsi_cmd *cmd;
2495 struct iscsi_conn *conn_p;
2496 bool found = false;
2497
2498 /*
2499 * Only send a Asynchronous Message on connections whos network
2500 * interface is still functional.
2501 */
2502 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2503 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2504 iscsit_inc_conn_usage_count(conn_p);
2505 found = true;
2506 break;
2507 }
2508 }
2509
2510 if (!found)
2511 return;
2512
2513 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2514 if (!cmd) {
2515 iscsit_dec_conn_usage_count(conn_p);
2516 return;
2517 }
2518
2519 cmd->logout_cid = conn->cid;
2520 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2521 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2522
2523 spin_lock_bh(&conn_p->cmd_lock);
2524 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2525 spin_unlock_bh(&conn_p->cmd_lock);
2526
2527 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2528 iscsit_dec_conn_usage_count(conn_p);
2529 }
2530
2531 static int iscsit_send_conn_drop_async_message(
2532 struct iscsi_cmd *cmd,
2533 struct iscsi_conn *conn)
2534 {
2535 struct iscsi_async *hdr;
2536
2537 cmd->tx_size = ISCSI_HDR_LEN;
2538 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2539
2540 hdr = (struct iscsi_async *) cmd->pdu;
2541 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2542 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2543 cmd->init_task_tag = RESERVED_ITT;
2544 cmd->targ_xfer_tag = 0xFFFFFFFF;
2545 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2546 cmd->stat_sn = conn->stat_sn++;
2547 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2548 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2549 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2550 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2551 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2552 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2553 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2554
2555 if (conn->conn_ops->HeaderDigest) {
2556 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2557
2558 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
2559 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2560
2561 cmd->tx_size += ISCSI_CRC_LEN;
2562 pr_debug("Attaching CRC32C HeaderDigest to"
2563 " Async Message 0x%08x\n", *header_digest);
2564 }
2565
2566 cmd->iov_misc[0].iov_base = cmd->pdu;
2567 cmd->iov_misc[0].iov_len = cmd->tx_size;
2568 cmd->iov_misc_count = 1;
2569
2570 pr_debug("Sending Connection Dropped Async Message StatSN:"
2571 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2572 cmd->logout_cid, conn->cid);
2573 return 0;
2574 }
2575
2576 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2577 {
2578 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2579 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2580 wait_for_completion_interruptible_timeout(
2581 &conn->tx_half_close_comp,
2582 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2583 }
2584 }
2585
2586 static void
2587 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2588 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2589 bool set_statsn)
2590 {
2591 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2592 hdr->flags = datain->flags;
2593 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2594 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2595 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2596 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2597 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2598 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2599 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2600 }
2601 }
2602 hton24(hdr->dlength, datain->length);
2603 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2604 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2605 (struct scsi_lun *)&hdr->lun);
2606 else
2607 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2608
2609 hdr->itt = cmd->init_task_tag;
2610
2611 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2612 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2613 else
2614 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2615 if (set_statsn)
2616 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2617 else
2618 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2619
2620 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2621 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2622 hdr->datasn = cpu_to_be32(datain->data_sn);
2623 hdr->offset = cpu_to_be32(datain->offset);
2624
2625 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2626 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2627 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2628 ntohl(hdr->offset), datain->length, conn->cid);
2629 }
2630
2631 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2632 {
2633 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2634 struct iscsi_datain datain;
2635 struct iscsi_datain_req *dr;
2636 struct kvec *iov;
2637 u32 iov_count = 0, tx_size = 0;
2638 int eodr = 0, ret, iov_ret;
2639 bool set_statsn = false;
2640
2641 memset(&datain, 0, sizeof(struct iscsi_datain));
2642 dr = iscsit_get_datain_values(cmd, &datain);
2643 if (!dr) {
2644 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2645 cmd->init_task_tag);
2646 return -1;
2647 }
2648 /*
2649 * Be paranoid and double check the logic for now.
2650 */
2651 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2652 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2653 " datain.length: %u exceeds cmd->data_length: %u\n",
2654 cmd->init_task_tag, datain.offset, datain.length,
2655 cmd->se_cmd.data_length);
2656 return -1;
2657 }
2658
2659 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2660 /*
2661 * Special case for successfully execution w/ both DATAIN
2662 * and Sense Data.
2663 */
2664 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2665 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2666 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2667 else {
2668 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2669 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2670 iscsit_increment_maxcmdsn(cmd, conn->sess);
2671 cmd->stat_sn = conn->stat_sn++;
2672 set_statsn = true;
2673 } else if (dr->dr_complete ==
2674 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2675 set_statsn = true;
2676 }
2677
2678 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2679
2680 iov = &cmd->iov_data[0];
2681 iov[iov_count].iov_base = cmd->pdu;
2682 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2683 tx_size += ISCSI_HDR_LEN;
2684
2685 if (conn->conn_ops->HeaderDigest) {
2686 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2687
2688 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
2689 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2690
2691 iov[0].iov_len += ISCSI_CRC_LEN;
2692 tx_size += ISCSI_CRC_LEN;
2693
2694 pr_debug("Attaching CRC32 HeaderDigest"
2695 " for DataIN PDU 0x%08x\n", *header_digest);
2696 }
2697
2698 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2699 datain.offset, datain.length);
2700 if (iov_ret < 0)
2701 return -1;
2702
2703 iov_count += iov_ret;
2704 tx_size += datain.length;
2705
2706 cmd->padding = ((-datain.length) & 3);
2707 if (cmd->padding) {
2708 iov[iov_count].iov_base = cmd->pad_bytes;
2709 iov[iov_count++].iov_len = cmd->padding;
2710 tx_size += cmd->padding;
2711
2712 pr_debug("Attaching %u padding bytes\n",
2713 cmd->padding);
2714 }
2715 if (conn->conn_ops->DataDigest) {
2716 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash, cmd,
2717 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2718
2719 iov[iov_count].iov_base = &cmd->data_crc;
2720 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2721 tx_size += ISCSI_CRC_LEN;
2722
2723 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2724 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2725 }
2726
2727 cmd->iov_data_count = iov_count;
2728 cmd->tx_size = tx_size;
2729
2730 ret = iscsit_fe_sendpage_sg(cmd, conn);
2731
2732 iscsit_unmap_iovec(cmd);
2733
2734 if (ret < 0) {
2735 iscsit_tx_thread_wait_for_tcp(conn);
2736 return ret;
2737 }
2738
2739 if (dr->dr_complete) {
2740 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2741 2 : 1;
2742 iscsit_free_datain_req(cmd, dr);
2743 }
2744
2745 return eodr;
2746 }
2747
2748 int
2749 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2750 struct iscsi_logout_rsp *hdr)
2751 {
2752 struct iscsi_conn *logout_conn = NULL;
2753 struct iscsi_conn_recovery *cr = NULL;
2754 struct iscsi_session *sess = conn->sess;
2755 /*
2756 * The actual shutting down of Sessions and/or Connections
2757 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2758 * is done in scsi_logout_post_handler().
2759 */
2760 switch (cmd->logout_reason) {
2761 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2762 pr_debug("iSCSI session logout successful, setting"
2763 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2764 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2765 break;
2766 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2767 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2768 break;
2769 /*
2770 * For CLOSECONNECTION logout requests carrying
2771 * a matching logout CID -> local CID, the reference
2772 * for the local CID will have been incremented in
2773 * iscsi_logout_closeconnection().
2774 *
2775 * For CLOSECONNECTION logout requests carrying
2776 * a different CID than the connection it arrived
2777 * on, the connection responding to cmd->logout_cid
2778 * is stopped in iscsit_logout_post_handler_diffcid().
2779 */
2780
2781 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2782 " successful.\n", cmd->logout_cid, conn->cid);
2783 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2784 break;
2785 case ISCSI_LOGOUT_REASON_RECOVERY:
2786 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2787 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2788 break;
2789 /*
2790 * If the connection is still active from our point of view
2791 * force connection recovery to occur.
2792 */
2793 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2794 cmd->logout_cid);
2795 if (logout_conn) {
2796 iscsit_connection_reinstatement_rcfr(logout_conn);
2797 iscsit_dec_conn_usage_count(logout_conn);
2798 }
2799
2800 cr = iscsit_get_inactive_connection_recovery_entry(
2801 conn->sess, cmd->logout_cid);
2802 if (!cr) {
2803 pr_err("Unable to locate CID: %hu for"
2804 " REMOVECONNFORRECOVERY Logout Request.\n",
2805 cmd->logout_cid);
2806 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2807 break;
2808 }
2809
2810 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2811
2812 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2813 " for recovery for CID: %hu on CID: %hu successful.\n",
2814 cmd->logout_cid, conn->cid);
2815 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2816 break;
2817 default:
2818 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2819 cmd->logout_reason);
2820 return -1;
2821 }
2822
2823 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2824 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2825 hdr->response = cmd->logout_response;
2826 hdr->itt = cmd->init_task_tag;
2827 cmd->stat_sn = conn->stat_sn++;
2828 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2829
2830 iscsit_increment_maxcmdsn(cmd, conn->sess);
2831 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2832 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2833
2834 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2835 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2836 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2837 cmd->logout_cid, conn->cid);
2838
2839 return 0;
2840 }
2841 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2842
2843 static int
2844 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2845 {
2846 struct kvec *iov;
2847 int niov = 0, tx_size, rc;
2848
2849 rc = iscsit_build_logout_rsp(cmd, conn,
2850 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2851 if (rc < 0)
2852 return rc;
2853
2854 tx_size = ISCSI_HDR_LEN;
2855 iov = &cmd->iov_misc[0];
2856 iov[niov].iov_base = cmd->pdu;
2857 iov[niov++].iov_len = ISCSI_HDR_LEN;
2858
2859 if (conn->conn_ops->HeaderDigest) {
2860 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2861
2862 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, &cmd->pdu[0],
2863 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2864
2865 iov[0].iov_len += ISCSI_CRC_LEN;
2866 tx_size += ISCSI_CRC_LEN;
2867 pr_debug("Attaching CRC32C HeaderDigest to"
2868 " Logout Response 0x%08x\n", *header_digest);
2869 }
2870 cmd->iov_misc_count = niov;
2871 cmd->tx_size = tx_size;
2872
2873 return 0;
2874 }
2875
2876 void
2877 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2878 struct iscsi_nopin *hdr, bool nopout_response)
2879 {
2880 hdr->opcode = ISCSI_OP_NOOP_IN;
2881 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2882 hton24(hdr->dlength, cmd->buf_ptr_size);
2883 if (nopout_response)
2884 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2885 hdr->itt = cmd->init_task_tag;
2886 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2887 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2888 conn->stat_sn;
2889 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2890
2891 if (nopout_response)
2892 iscsit_increment_maxcmdsn(cmd, conn->sess);
2893
2894 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2895 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2896
2897 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2898 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2899 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2900 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2901 }
2902 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2903
2904 /*
2905 * Unsolicited NOPIN, either requesting a response or not.
2906 */
2907 static int iscsit_send_unsolicited_nopin(
2908 struct iscsi_cmd *cmd,
2909 struct iscsi_conn *conn,
2910 int want_response)
2911 {
2912 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2913 int tx_size = ISCSI_HDR_LEN, ret;
2914
2915 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2916
2917 if (conn->conn_ops->HeaderDigest) {
2918 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2919
2920 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
2921 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2922
2923 tx_size += ISCSI_CRC_LEN;
2924 pr_debug("Attaching CRC32C HeaderDigest to"
2925 " NopIN 0x%08x\n", *header_digest);
2926 }
2927
2928 cmd->iov_misc[0].iov_base = cmd->pdu;
2929 cmd->iov_misc[0].iov_len = tx_size;
2930 cmd->iov_misc_count = 1;
2931 cmd->tx_size = tx_size;
2932
2933 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2934 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2935
2936 ret = iscsit_send_tx_data(cmd, conn, 1);
2937 if (ret < 0) {
2938 iscsit_tx_thread_wait_for_tcp(conn);
2939 return ret;
2940 }
2941
2942 spin_lock_bh(&cmd->istate_lock);
2943 cmd->i_state = want_response ?
2944 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2945 spin_unlock_bh(&cmd->istate_lock);
2946
2947 return 0;
2948 }
2949
2950 static int
2951 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2952 {
2953 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2954 struct kvec *iov;
2955 u32 padding = 0;
2956 int niov = 0, tx_size;
2957
2958 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2959
2960 tx_size = ISCSI_HDR_LEN;
2961 iov = &cmd->iov_misc[0];
2962 iov[niov].iov_base = cmd->pdu;
2963 iov[niov++].iov_len = ISCSI_HDR_LEN;
2964
2965 if (conn->conn_ops->HeaderDigest) {
2966 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2967
2968 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
2969 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2970
2971 iov[0].iov_len += ISCSI_CRC_LEN;
2972 tx_size += ISCSI_CRC_LEN;
2973 pr_debug("Attaching CRC32C HeaderDigest"
2974 " to NopIn 0x%08x\n", *header_digest);
2975 }
2976
2977 /*
2978 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2979 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2980 */
2981 if (cmd->buf_ptr_size) {
2982 iov[niov].iov_base = cmd->buf_ptr;
2983 iov[niov++].iov_len = cmd->buf_ptr_size;
2984 tx_size += cmd->buf_ptr_size;
2985
2986 pr_debug("Echoing back %u bytes of ping"
2987 " data.\n", cmd->buf_ptr_size);
2988
2989 padding = ((-cmd->buf_ptr_size) & 3);
2990 if (padding != 0) {
2991 iov[niov].iov_base = &cmd->pad_bytes;
2992 iov[niov++].iov_len = padding;
2993 tx_size += padding;
2994 pr_debug("Attaching %u additional"
2995 " padding bytes.\n", padding);
2996 }
2997 if (conn->conn_ops->DataDigest) {
2998 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
2999 cmd->buf_ptr, cmd->buf_ptr_size,
3000 padding, (u8 *)&cmd->pad_bytes,
3001 (u8 *)&cmd->data_crc);
3002
3003 iov[niov].iov_base = &cmd->data_crc;
3004 iov[niov++].iov_len = ISCSI_CRC_LEN;
3005 tx_size += ISCSI_CRC_LEN;
3006 pr_debug("Attached DataDigest for %u"
3007 " bytes of ping data, CRC 0x%08x\n",
3008 cmd->buf_ptr_size, cmd->data_crc);
3009 }
3010 }
3011
3012 cmd->iov_misc_count = niov;
3013 cmd->tx_size = tx_size;
3014
3015 return 0;
3016 }
3017
3018 static int iscsit_send_r2t(
3019 struct iscsi_cmd *cmd,
3020 struct iscsi_conn *conn)
3021 {
3022 int tx_size = 0;
3023 struct iscsi_r2t *r2t;
3024 struct iscsi_r2t_rsp *hdr;
3025 int ret;
3026
3027 r2t = iscsit_get_r2t_from_list(cmd);
3028 if (!r2t)
3029 return -1;
3030
3031 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3032 memset(hdr, 0, ISCSI_HDR_LEN);
3033 hdr->opcode = ISCSI_OP_R2T;
3034 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3035 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3036 (struct scsi_lun *)&hdr->lun);
3037 hdr->itt = cmd->init_task_tag;
3038 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3039 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3040 hdr->statsn = cpu_to_be32(conn->stat_sn);
3041 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3042 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3043 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3044 hdr->data_offset = cpu_to_be32(r2t->offset);
3045 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3046
3047 cmd->iov_misc[0].iov_base = cmd->pdu;
3048 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3049 tx_size += ISCSI_HDR_LEN;
3050
3051 if (conn->conn_ops->HeaderDigest) {
3052 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3053
3054 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
3055 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3056
3057 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3058 tx_size += ISCSI_CRC_LEN;
3059 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3060 " PDU 0x%08x\n", *header_digest);
3061 }
3062
3063 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3064 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3065 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3066 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3067 r2t->offset, r2t->xfer_len, conn->cid);
3068
3069 cmd->iov_misc_count = 1;
3070 cmd->tx_size = tx_size;
3071
3072 spin_lock_bh(&cmd->r2t_lock);
3073 r2t->sent_r2t = 1;
3074 spin_unlock_bh(&cmd->r2t_lock);
3075
3076 ret = iscsit_send_tx_data(cmd, conn, 1);
3077 if (ret < 0) {
3078 iscsit_tx_thread_wait_for_tcp(conn);
3079 return ret;
3080 }
3081
3082 spin_lock_bh(&cmd->dataout_timeout_lock);
3083 iscsit_start_dataout_timer(cmd, conn);
3084 spin_unlock_bh(&cmd->dataout_timeout_lock);
3085
3086 return 0;
3087 }
3088
3089 /*
3090 * @recovery: If called from iscsi_task_reassign_complete_write() for
3091 * connection recovery.
3092 */
3093 int iscsit_build_r2ts_for_cmd(
3094 struct iscsi_conn *conn,
3095 struct iscsi_cmd *cmd,
3096 bool recovery)
3097 {
3098 int first_r2t = 1;
3099 u32 offset = 0, xfer_len = 0;
3100
3101 spin_lock_bh(&cmd->r2t_lock);
3102 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3103 spin_unlock_bh(&cmd->r2t_lock);
3104 return 0;
3105 }
3106
3107 if (conn->sess->sess_ops->DataSequenceInOrder &&
3108 !recovery)
3109 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3110
3111 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3112 if (conn->sess->sess_ops->DataSequenceInOrder) {
3113 offset = cmd->r2t_offset;
3114
3115 if (first_r2t && recovery) {
3116 int new_data_end = offset +
3117 conn->sess->sess_ops->MaxBurstLength -
3118 cmd->next_burst_len;
3119
3120 if (new_data_end > cmd->se_cmd.data_length)
3121 xfer_len = cmd->se_cmd.data_length - offset;
3122 else
3123 xfer_len =
3124 conn->sess->sess_ops->MaxBurstLength -
3125 cmd->next_burst_len;
3126 } else {
3127 int new_data_end = offset +
3128 conn->sess->sess_ops->MaxBurstLength;
3129
3130 if (new_data_end > cmd->se_cmd.data_length)
3131 xfer_len = cmd->se_cmd.data_length - offset;
3132 else
3133 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3134 }
3135 cmd->r2t_offset += xfer_len;
3136
3137 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3138 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3139 } else {
3140 struct iscsi_seq *seq;
3141
3142 seq = iscsit_get_seq_holder_for_r2t(cmd);
3143 if (!seq) {
3144 spin_unlock_bh(&cmd->r2t_lock);
3145 return -1;
3146 }
3147
3148 offset = seq->offset;
3149 xfer_len = seq->xfer_len;
3150
3151 if (cmd->seq_send_order == cmd->seq_count)
3152 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3153 }
3154 cmd->outstanding_r2ts++;
3155 first_r2t = 0;
3156
3157 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3158 spin_unlock_bh(&cmd->r2t_lock);
3159 return -1;
3160 }
3161
3162 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3163 break;
3164 }
3165 spin_unlock_bh(&cmd->r2t_lock);
3166
3167 return 0;
3168 }
3169
3170 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3171 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3172 {
3173 if (inc_stat_sn)
3174 cmd->stat_sn = conn->stat_sn++;
3175
3176 atomic_long_inc(&conn->sess->rsp_pdus);
3177
3178 memset(hdr, 0, ISCSI_HDR_LEN);
3179 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3180 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3181 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3182 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3183 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3184 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3185 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3186 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3187 }
3188 hdr->response = cmd->iscsi_response;
3189 hdr->cmd_status = cmd->se_cmd.scsi_status;
3190 hdr->itt = cmd->init_task_tag;
3191 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3192
3193 iscsit_increment_maxcmdsn(cmd, conn->sess);
3194 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3195 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3196
3197 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3198 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3199 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3200 cmd->se_cmd.scsi_status, conn->cid);
3201 }
3202 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3203
3204 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3205 {
3206 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3207 struct kvec *iov;
3208 u32 padding = 0, tx_size = 0;
3209 int iov_count = 0;
3210 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3211
3212 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3213
3214 iov = &cmd->iov_misc[0];
3215 iov[iov_count].iov_base = cmd->pdu;
3216 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3217 tx_size += ISCSI_HDR_LEN;
3218
3219 /*
3220 * Attach SENSE DATA payload to iSCSI Response PDU
3221 */
3222 if (cmd->se_cmd.sense_buffer &&
3223 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3224 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3225 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3226 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3227
3228 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3229 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3230 iov[iov_count].iov_base = cmd->sense_buffer;
3231 iov[iov_count++].iov_len =
3232 (cmd->se_cmd.scsi_sense_length + padding);
3233 tx_size += cmd->se_cmd.scsi_sense_length;
3234
3235 if (padding) {
3236 memset(cmd->sense_buffer +
3237 cmd->se_cmd.scsi_sense_length, 0, padding);
3238 tx_size += padding;
3239 pr_debug("Adding %u bytes of padding to"
3240 " SENSE.\n", padding);
3241 }
3242
3243 if (conn->conn_ops->DataDigest) {
3244 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
3245 cmd->sense_buffer,
3246 (cmd->se_cmd.scsi_sense_length + padding),
3247 0, NULL, (u8 *)&cmd->data_crc);
3248
3249 iov[iov_count].iov_base = &cmd->data_crc;
3250 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3251 tx_size += ISCSI_CRC_LEN;
3252
3253 pr_debug("Attaching CRC32 DataDigest for"
3254 " SENSE, %u bytes CRC 0x%08x\n",
3255 (cmd->se_cmd.scsi_sense_length + padding),
3256 cmd->data_crc);
3257 }
3258
3259 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3260 " Response PDU\n",
3261 cmd->se_cmd.scsi_sense_length);
3262 }
3263
3264 if (conn->conn_ops->HeaderDigest) {
3265 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3266
3267 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
3268 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3269
3270 iov[0].iov_len += ISCSI_CRC_LEN;
3271 tx_size += ISCSI_CRC_LEN;
3272 pr_debug("Attaching CRC32 HeaderDigest for Response"
3273 " PDU 0x%08x\n", *header_digest);
3274 }
3275
3276 cmd->iov_misc_count = iov_count;
3277 cmd->tx_size = tx_size;
3278
3279 return 0;
3280 }
3281
3282 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3283 {
3284 switch (se_tmr->response) {
3285 case TMR_FUNCTION_COMPLETE:
3286 return ISCSI_TMF_RSP_COMPLETE;
3287 case TMR_TASK_DOES_NOT_EXIST:
3288 return ISCSI_TMF_RSP_NO_TASK;
3289 case TMR_LUN_DOES_NOT_EXIST:
3290 return ISCSI_TMF_RSP_NO_LUN;
3291 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3292 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3293 case TMR_FUNCTION_REJECTED:
3294 default:
3295 return ISCSI_TMF_RSP_REJECTED;
3296 }
3297 }
3298
3299 void
3300 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3301 struct iscsi_tm_rsp *hdr)
3302 {
3303 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3304
3305 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3306 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3307 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3308 hdr->itt = cmd->init_task_tag;
3309 cmd->stat_sn = conn->stat_sn++;
3310 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3311
3312 iscsit_increment_maxcmdsn(cmd, conn->sess);
3313 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3314 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3315
3316 pr_debug("Built Task Management Response ITT: 0x%08x,"
3317 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3318 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3319 }
3320 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3321
3322 static int
3323 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3324 {
3325 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3326 u32 tx_size = 0;
3327
3328 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3329
3330 cmd->iov_misc[0].iov_base = cmd->pdu;
3331 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3332 tx_size += ISCSI_HDR_LEN;
3333
3334 if (conn->conn_ops->HeaderDigest) {
3335 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3336
3337 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
3338 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3339
3340 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3341 tx_size += ISCSI_CRC_LEN;
3342 pr_debug("Attaching CRC32 HeaderDigest for Task"
3343 " Mgmt Response PDU 0x%08x\n", *header_digest);
3344 }
3345
3346 cmd->iov_misc_count = 1;
3347 cmd->tx_size = tx_size;
3348
3349 return 0;
3350 }
3351
3352 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3353 {
3354 bool ret = false;
3355
3356 if (np->np_sockaddr.ss_family == AF_INET6) {
3357 const struct sockaddr_in6 sin6 = {
3358 .sin6_addr = IN6ADDR_ANY_INIT };
3359 struct sockaddr_in6 *sock_in6 =
3360 (struct sockaddr_in6 *)&np->np_sockaddr;
3361
3362 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3363 sin6.sin6_addr.s6_addr, 16))
3364 ret = true;
3365 } else {
3366 struct sockaddr_in * sock_in =
3367 (struct sockaddr_in *)&np->np_sockaddr;
3368
3369 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3370 ret = true;
3371 }
3372
3373 return ret;
3374 }
3375
3376 #define SENDTARGETS_BUF_LIMIT 32768U
3377
3378 static int
3379 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3380 enum iscsit_transport_type network_transport,
3381 int skip_bytes, bool *completed)
3382 {
3383 char *payload = NULL;
3384 struct iscsi_conn *conn = cmd->conn;
3385 struct iscsi_portal_group *tpg;
3386 struct iscsi_tiqn *tiqn;
3387 struct iscsi_tpg_np *tpg_np;
3388 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3389 int target_name_printed;
3390 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3391 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3392 bool active;
3393
3394 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3395 SENDTARGETS_BUF_LIMIT);
3396
3397 payload = kzalloc(buffer_len, GFP_KERNEL);
3398 if (!payload) {
3399 pr_err("Unable to allocate memory for sendtargets"
3400 " response.\n");
3401 return -ENOMEM;
3402 }
3403 /*
3404 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3405 * explicit case..
3406 */
3407 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3408 text_ptr = strchr(text_in, '=');
3409 if (!text_ptr) {
3410 pr_err("Unable to locate '=' string in text_in:"
3411 " %s\n", text_in);
3412 kfree(payload);
3413 return -EINVAL;
3414 }
3415 /*
3416 * Skip over '=' character..
3417 */
3418 text_ptr += 1;
3419 }
3420
3421 spin_lock(&tiqn_lock);
3422 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3423 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3424 strcmp(tiqn->tiqn, text_ptr)) {
3425 continue;
3426 }
3427
3428 target_name_printed = 0;
3429
3430 spin_lock(&tiqn->tiqn_tpg_lock);
3431 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3432
3433 /* If demo_mode_discovery=0 and generate_node_acls=0
3434 * (demo mode dislabed) do not return
3435 * TargetName+TargetAddress unless a NodeACL exists.
3436 */
3437
3438 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3439 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3440 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3441 cmd->conn->sess->sess_ops->InitiatorName))) {
3442 continue;
3443 }
3444
3445 spin_lock(&tpg->tpg_state_lock);
3446 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3447 spin_unlock(&tpg->tpg_state_lock);
3448
3449 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3450 continue;
3451
3452 spin_lock(&tpg->tpg_np_lock);
3453 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3454 tpg_np_list) {
3455 struct iscsi_np *np = tpg_np->tpg_np;
3456 bool inaddr_any = iscsit_check_inaddr_any(np);
3457 struct sockaddr_storage *sockaddr;
3458
3459 if (np->np_network_transport != network_transport)
3460 continue;
3461
3462 if (!target_name_printed) {
3463 len = sprintf(buf, "TargetName=%s",
3464 tiqn->tiqn);
3465 len += 1;
3466
3467 if ((len + payload_len) > buffer_len) {
3468 spin_unlock(&tpg->tpg_np_lock);
3469 spin_unlock(&tiqn->tiqn_tpg_lock);
3470 end_of_buf = 1;
3471 goto eob;
3472 }
3473
3474 if (skip_bytes && len <= skip_bytes) {
3475 skip_bytes -= len;
3476 } else {
3477 memcpy(payload + payload_len, buf, len);
3478 payload_len += len;
3479 target_name_printed = 1;
3480 if (len > skip_bytes)
3481 skip_bytes = 0;
3482 }
3483 }
3484
3485 if (inaddr_any)
3486 sockaddr = &conn->local_sockaddr;
3487 else
3488 sockaddr = &np->np_sockaddr;
3489
3490 len = sprintf(buf, "TargetAddress="
3491 "%pISpc,%hu",
3492 sockaddr,
3493 tpg->tpgt);
3494 len += 1;
3495
3496 if ((len + payload_len) > buffer_len) {
3497 spin_unlock(&tpg->tpg_np_lock);
3498 spin_unlock(&tiqn->tiqn_tpg_lock);
3499 end_of_buf = 1;
3500 goto eob;
3501 }
3502
3503 if (skip_bytes && len <= skip_bytes) {
3504 skip_bytes -= len;
3505 } else {
3506 memcpy(payload + payload_len, buf, len);
3507 payload_len += len;
3508 if (len > skip_bytes)
3509 skip_bytes = 0;
3510 }
3511 }
3512 spin_unlock(&tpg->tpg_np_lock);
3513 }
3514 spin_unlock(&tiqn->tiqn_tpg_lock);
3515 eob:
3516 if (end_of_buf) {
3517 *completed = false;
3518 break;
3519 }
3520
3521 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3522 break;
3523 }
3524 spin_unlock(&tiqn_lock);
3525
3526 cmd->buf_ptr = payload;
3527
3528 return payload_len;
3529 }
3530
3531 int
3532 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3533 struct iscsi_text_rsp *hdr,
3534 enum iscsit_transport_type network_transport)
3535 {
3536 int text_length, padding;
3537 bool completed = true;
3538
3539 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3540 cmd->read_data_done,
3541 &completed);
3542 if (text_length < 0)
3543 return text_length;
3544
3545 if (completed) {
3546 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3547 } else {
3548 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3549 cmd->read_data_done += text_length;
3550 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3551 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3552 }
3553 hdr->opcode = ISCSI_OP_TEXT_RSP;
3554 padding = ((-text_length) & 3);
3555 hton24(hdr->dlength, text_length);
3556 hdr->itt = cmd->init_task_tag;
3557 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3558 cmd->stat_sn = conn->stat_sn++;
3559 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3560
3561 iscsit_increment_maxcmdsn(cmd, conn->sess);
3562 /*
3563 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3564 * correctly increment MaxCmdSN for each response answering a
3565 * non immediate text request with a valid CmdSN.
3566 */
3567 cmd->maxcmdsn_inc = 0;
3568 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3569 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3570
3571 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3572 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3573 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3574 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3575 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3576
3577 return text_length + padding;
3578 }
3579 EXPORT_SYMBOL(iscsit_build_text_rsp);
3580
3581 static int iscsit_send_text_rsp(
3582 struct iscsi_cmd *cmd,
3583 struct iscsi_conn *conn)
3584 {
3585 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3586 struct kvec *iov;
3587 u32 tx_size = 0;
3588 int text_length, iov_count = 0, rc;
3589
3590 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP);
3591 if (rc < 0)
3592 return rc;
3593
3594 text_length = rc;
3595 iov = &cmd->iov_misc[0];
3596 iov[iov_count].iov_base = cmd->pdu;
3597 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3598 iov[iov_count].iov_base = cmd->buf_ptr;
3599 iov[iov_count++].iov_len = text_length;
3600
3601 tx_size += (ISCSI_HDR_LEN + text_length);
3602
3603 if (conn->conn_ops->HeaderDigest) {
3604 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3605
3606 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
3607 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3608
3609 iov[0].iov_len += ISCSI_CRC_LEN;
3610 tx_size += ISCSI_CRC_LEN;
3611 pr_debug("Attaching CRC32 HeaderDigest for"
3612 " Text Response PDU 0x%08x\n", *header_digest);
3613 }
3614
3615 if (conn->conn_ops->DataDigest) {
3616 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
3617 cmd->buf_ptr, text_length,
3618 0, NULL, (u8 *)&cmd->data_crc);
3619
3620 iov[iov_count].iov_base = &cmd->data_crc;
3621 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3622 tx_size += ISCSI_CRC_LEN;
3623
3624 pr_debug("Attaching DataDigest for %u bytes of text"
3625 " data, CRC 0x%08x\n", text_length,
3626 cmd->data_crc);
3627 }
3628
3629 cmd->iov_misc_count = iov_count;
3630 cmd->tx_size = tx_size;
3631
3632 return 0;
3633 }
3634
3635 void
3636 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3637 struct iscsi_reject *hdr)
3638 {
3639 hdr->opcode = ISCSI_OP_REJECT;
3640 hdr->reason = cmd->reject_reason;
3641 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3642 hton24(hdr->dlength, ISCSI_HDR_LEN);
3643 hdr->ffffffff = cpu_to_be32(0xffffffff);
3644 cmd->stat_sn = conn->stat_sn++;
3645 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3646 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3647 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3648
3649 }
3650 EXPORT_SYMBOL(iscsit_build_reject);
3651
3652 static int iscsit_send_reject(
3653 struct iscsi_cmd *cmd,
3654 struct iscsi_conn *conn)
3655 {
3656 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3657 struct kvec *iov;
3658 u32 iov_count = 0, tx_size;
3659
3660 iscsit_build_reject(cmd, conn, hdr);
3661
3662 iov = &cmd->iov_misc[0];
3663 iov[iov_count].iov_base = cmd->pdu;
3664 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3665 iov[iov_count].iov_base = cmd->buf_ptr;
3666 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3667
3668 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3669
3670 if (conn->conn_ops->HeaderDigest) {
3671 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3672
3673 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
3674 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3675
3676 iov[0].iov_len += ISCSI_CRC_LEN;
3677 tx_size += ISCSI_CRC_LEN;
3678 pr_debug("Attaching CRC32 HeaderDigest for"
3679 " REJECT PDU 0x%08x\n", *header_digest);
3680 }
3681
3682 if (conn->conn_ops->DataDigest) {
3683 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->buf_ptr,
3684 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3685
3686 iov[iov_count].iov_base = &cmd->data_crc;
3687 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3688 tx_size += ISCSI_CRC_LEN;
3689 pr_debug("Attaching CRC32 DataDigest for REJECT"
3690 " PDU 0x%08x\n", cmd->data_crc);
3691 }
3692
3693 cmd->iov_misc_count = iov_count;
3694 cmd->tx_size = tx_size;
3695
3696 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3697 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3698
3699 return 0;
3700 }
3701
3702 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3703 {
3704 int ord, cpu;
3705 /*
3706 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3707 * within iscsit_start_kthreads()
3708 *
3709 * Here we use bitmap_id to determine which CPU that this
3710 * iSCSI connection's RX/TX threads will be scheduled to
3711 * execute upon.
3712 */
3713 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3714 for_each_online_cpu(cpu) {
3715 if (ord-- == 0) {
3716 cpumask_set_cpu(cpu, conn->conn_cpumask);
3717 return;
3718 }
3719 }
3720 /*
3721 * This should never be reached..
3722 */
3723 dump_stack();
3724 cpumask_setall(conn->conn_cpumask);
3725 }
3726
3727 static inline void iscsit_thread_check_cpumask(
3728 struct iscsi_conn *conn,
3729 struct task_struct *p,
3730 int mode)
3731 {
3732 /*
3733 * mode == 1 signals iscsi_target_tx_thread() usage.
3734 * mode == 0 signals iscsi_target_rx_thread() usage.
3735 */
3736 if (mode == 1) {
3737 if (!conn->conn_tx_reset_cpumask)
3738 return;
3739 conn->conn_tx_reset_cpumask = 0;
3740 } else {
3741 if (!conn->conn_rx_reset_cpumask)
3742 return;
3743 conn->conn_rx_reset_cpumask = 0;
3744 }
3745 /*
3746 * Update the CPU mask for this single kthread so that
3747 * both TX and RX kthreads are scheduled to run on the
3748 * same CPU.
3749 */
3750 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3751 }
3752
3753 static int
3754 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3755 {
3756 int ret;
3757
3758 switch (state) {
3759 case ISTATE_SEND_R2T:
3760 ret = iscsit_send_r2t(cmd, conn);
3761 if (ret < 0)
3762 goto err;
3763 break;
3764 case ISTATE_REMOVE:
3765 spin_lock_bh(&conn->cmd_lock);
3766 list_del_init(&cmd->i_conn_node);
3767 spin_unlock_bh(&conn->cmd_lock);
3768
3769 iscsit_free_cmd(cmd, false);
3770 break;
3771 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3772 iscsit_mod_nopin_response_timer(conn);
3773 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3774 if (ret < 0)
3775 goto err;
3776 break;
3777 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3778 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3779 if (ret < 0)
3780 goto err;
3781 break;
3782 default:
3783 pr_err("Unknown Opcode: 0x%02x ITT:"
3784 " 0x%08x, i_state: %d on CID: %hu\n",
3785 cmd->iscsi_opcode, cmd->init_task_tag, state,
3786 conn->cid);
3787 goto err;
3788 }
3789
3790 return 0;
3791
3792 err:
3793 return -1;
3794 }
3795
3796 static int
3797 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3798 {
3799 struct iscsit_transport *t = conn->conn_transport;
3800 struct iscsi_queue_req *qr;
3801 struct iscsi_cmd *cmd;
3802 u8 state;
3803 int ret;
3804
3805 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3806 atomic_set(&conn->check_immediate_queue, 0);
3807 cmd = qr->cmd;
3808 state = qr->state;
3809 kmem_cache_free(lio_qr_cache, qr);
3810
3811 ret = t->iscsit_immediate_queue(conn, cmd, state);
3812 if (ret < 0)
3813 return ret;
3814 }
3815
3816 return 0;
3817 }
3818
3819 static int
3820 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3821 {
3822 int ret;
3823
3824 check_rsp_state:
3825 switch (state) {
3826 case ISTATE_SEND_DATAIN:
3827 ret = iscsit_send_datain(cmd, conn);
3828 if (ret < 0)
3829 goto err;
3830 else if (!ret)
3831 /* more drs */
3832 goto check_rsp_state;
3833 else if (ret == 1) {
3834 /* all done */
3835 spin_lock_bh(&cmd->istate_lock);
3836 cmd->i_state = ISTATE_SENT_STATUS;
3837 spin_unlock_bh(&cmd->istate_lock);
3838
3839 if (atomic_read(&conn->check_immediate_queue))
3840 return 1;
3841
3842 return 0;
3843 } else if (ret == 2) {
3844 /* Still must send status,
3845 SCF_TRANSPORT_TASK_SENSE was set */
3846 spin_lock_bh(&cmd->istate_lock);
3847 cmd->i_state = ISTATE_SEND_STATUS;
3848 spin_unlock_bh(&cmd->istate_lock);
3849 state = ISTATE_SEND_STATUS;
3850 goto check_rsp_state;
3851 }
3852
3853 break;
3854 case ISTATE_SEND_STATUS:
3855 case ISTATE_SEND_STATUS_RECOVERY:
3856 ret = iscsit_send_response(cmd, conn);
3857 break;
3858 case ISTATE_SEND_LOGOUTRSP:
3859 ret = iscsit_send_logout(cmd, conn);
3860 break;
3861 case ISTATE_SEND_ASYNCMSG:
3862 ret = iscsit_send_conn_drop_async_message(
3863 cmd, conn);
3864 break;
3865 case ISTATE_SEND_NOPIN:
3866 ret = iscsit_send_nopin(cmd, conn);
3867 break;
3868 case ISTATE_SEND_REJECT:
3869 ret = iscsit_send_reject(cmd, conn);
3870 break;
3871 case ISTATE_SEND_TASKMGTRSP:
3872 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3873 if (ret != 0)
3874 break;
3875 ret = iscsit_tmr_post_handler(cmd, conn);
3876 if (ret != 0)
3877 iscsit_fall_back_to_erl0(conn->sess);
3878 break;
3879 case ISTATE_SEND_TEXTRSP:
3880 ret = iscsit_send_text_rsp(cmd, conn);
3881 break;
3882 default:
3883 pr_err("Unknown Opcode: 0x%02x ITT:"
3884 " 0x%08x, i_state: %d on CID: %hu\n",
3885 cmd->iscsi_opcode, cmd->init_task_tag,
3886 state, conn->cid);
3887 goto err;
3888 }
3889 if (ret < 0)
3890 goto err;
3891
3892 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3893 iscsit_tx_thread_wait_for_tcp(conn);
3894 iscsit_unmap_iovec(cmd);
3895 goto err;
3896 }
3897 iscsit_unmap_iovec(cmd);
3898
3899 switch (state) {
3900 case ISTATE_SEND_LOGOUTRSP:
3901 if (!iscsit_logout_post_handler(cmd, conn))
3902 return -ECONNRESET;
3903 /* fall through */
3904 case ISTATE_SEND_STATUS:
3905 case ISTATE_SEND_ASYNCMSG:
3906 case ISTATE_SEND_NOPIN:
3907 case ISTATE_SEND_STATUS_RECOVERY:
3908 case ISTATE_SEND_TEXTRSP:
3909 case ISTATE_SEND_TASKMGTRSP:
3910 case ISTATE_SEND_REJECT:
3911 spin_lock_bh(&cmd->istate_lock);
3912 cmd->i_state = ISTATE_SENT_STATUS;
3913 spin_unlock_bh(&cmd->istate_lock);
3914 break;
3915 default:
3916 pr_err("Unknown Opcode: 0x%02x ITT:"
3917 " 0x%08x, i_state: %d on CID: %hu\n",
3918 cmd->iscsi_opcode, cmd->init_task_tag,
3919 cmd->i_state, conn->cid);
3920 goto err;
3921 }
3922
3923 if (atomic_read(&conn->check_immediate_queue))
3924 return 1;
3925
3926 return 0;
3927
3928 err:
3929 return -1;
3930 }
3931
3932 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3933 {
3934 struct iscsit_transport *t = conn->conn_transport;
3935 struct iscsi_queue_req *qr;
3936 struct iscsi_cmd *cmd;
3937 u8 state;
3938 int ret;
3939
3940 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3941 cmd = qr->cmd;
3942 state = qr->state;
3943 kmem_cache_free(lio_qr_cache, qr);
3944
3945 ret = t->iscsit_response_queue(conn, cmd, state);
3946 if (ret == 1 || ret < 0)
3947 return ret;
3948 }
3949
3950 return 0;
3951 }
3952
3953 int iscsi_target_tx_thread(void *arg)
3954 {
3955 int ret = 0;
3956 struct iscsi_conn *conn = arg;
3957 /*
3958 * Allow ourselves to be interrupted by SIGINT so that a
3959 * connection recovery / failure event can be triggered externally.
3960 */
3961 allow_signal(SIGINT);
3962
3963 while (!kthread_should_stop()) {
3964 /*
3965 * Ensure that both TX and RX per connection kthreads
3966 * are scheduled to run on the same CPU.
3967 */
3968 iscsit_thread_check_cpumask(conn, current, 1);
3969
3970 wait_event_interruptible(conn->queues_wq,
3971 !iscsit_conn_all_queues_empty(conn));
3972
3973 if (signal_pending(current))
3974 goto transport_err;
3975
3976 get_immediate:
3977 ret = iscsit_handle_immediate_queue(conn);
3978 if (ret < 0)
3979 goto transport_err;
3980
3981 ret = iscsit_handle_response_queue(conn);
3982 if (ret == 1)
3983 goto get_immediate;
3984 else if (ret == -ECONNRESET)
3985 goto out;
3986 else if (ret < 0)
3987 goto transport_err;
3988 }
3989
3990 transport_err:
3991 /*
3992 * Avoid the normal connection failure code-path if this connection
3993 * is still within LOGIN mode, and iscsi_np process context is
3994 * responsible for cleaning up the early connection failure.
3995 */
3996 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3997 iscsit_take_action_for_connection_exit(conn);
3998 out:
3999 return 0;
4000 }
4001
4002 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
4003 {
4004 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
4005 struct iscsi_cmd *cmd;
4006 int ret = 0;
4007
4008 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
4009 case ISCSI_OP_SCSI_CMD:
4010 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4011 if (!cmd)
4012 goto reject;
4013
4014 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
4015 break;
4016 case ISCSI_OP_SCSI_DATA_OUT:
4017 ret = iscsit_handle_data_out(conn, buf);
4018 break;
4019 case ISCSI_OP_NOOP_OUT:
4020 cmd = NULL;
4021 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4022 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4023 if (!cmd)
4024 goto reject;
4025 }
4026 ret = iscsit_handle_nop_out(conn, cmd, buf);
4027 break;
4028 case ISCSI_OP_SCSI_TMFUNC:
4029 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4030 if (!cmd)
4031 goto reject;
4032
4033 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4034 break;
4035 case ISCSI_OP_TEXT:
4036 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4037 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4038 if (!cmd)
4039 goto reject;
4040 } else {
4041 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4042 if (!cmd)
4043 goto reject;
4044 }
4045
4046 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4047 break;
4048 case ISCSI_OP_LOGOUT:
4049 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4050 if (!cmd)
4051 goto reject;
4052
4053 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4054 if (ret > 0)
4055 wait_for_completion_timeout(&conn->conn_logout_comp,
4056 SECONDS_FOR_LOGOUT_COMP * HZ);
4057 break;
4058 case ISCSI_OP_SNACK:
4059 ret = iscsit_handle_snack(conn, buf);
4060 break;
4061 default:
4062 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4063 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4064 pr_err("Cannot recover from unknown"
4065 " opcode while ERL=0, closing iSCSI connection.\n");
4066 return -1;
4067 }
4068 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
4069 " closing iSCSI connection.\n");
4070 ret = -1;
4071 break;
4072 }
4073
4074 return ret;
4075 reject:
4076 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4077 }
4078
4079 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
4080 {
4081 bool ret;
4082
4083 spin_lock_bh(&conn->state_lock);
4084 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
4085 spin_unlock_bh(&conn->state_lock);
4086
4087 return ret;
4088 }
4089
4090 int iscsi_target_rx_thread(void *arg)
4091 {
4092 int ret, rc;
4093 u8 buffer[ISCSI_HDR_LEN], opcode;
4094 u32 checksum = 0, digest = 0;
4095 struct iscsi_conn *conn = arg;
4096 struct kvec iov;
4097 /*
4098 * Allow ourselves to be interrupted by SIGINT so that a
4099 * connection recovery / failure event can be triggered externally.
4100 */
4101 allow_signal(SIGINT);
4102 /*
4103 * Wait for iscsi_post_login_handler() to complete before allowing
4104 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4105 */
4106 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4107 if (rc < 0 || iscsi_target_check_conn_state(conn))
4108 return 0;
4109
4110 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4111 struct completion comp;
4112
4113 init_completion(&comp);
4114 rc = wait_for_completion_interruptible(&comp);
4115 if (rc < 0)
4116 goto transport_err;
4117
4118 goto transport_err;
4119 }
4120
4121 while (!kthread_should_stop()) {
4122 /*
4123 * Ensure that both TX and RX per connection kthreads
4124 * are scheduled to run on the same CPU.
4125 */
4126 iscsit_thread_check_cpumask(conn, current, 0);
4127
4128 memset(buffer, 0, ISCSI_HDR_LEN);
4129 memset(&iov, 0, sizeof(struct kvec));
4130
4131 iov.iov_base = buffer;
4132 iov.iov_len = ISCSI_HDR_LEN;
4133
4134 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4135 if (ret != ISCSI_HDR_LEN) {
4136 iscsit_rx_thread_wait_for_tcp(conn);
4137 goto transport_err;
4138 }
4139
4140 if (conn->conn_ops->HeaderDigest) {
4141 iov.iov_base = &digest;
4142 iov.iov_len = ISCSI_CRC_LEN;
4143
4144 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4145 if (ret != ISCSI_CRC_LEN) {
4146 iscsit_rx_thread_wait_for_tcp(conn);
4147 goto transport_err;
4148 }
4149
4150 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
4151 buffer, ISCSI_HDR_LEN,
4152 0, NULL, (u8 *)&checksum);
4153
4154 if (digest != checksum) {
4155 pr_err("HeaderDigest CRC32C failed,"
4156 " received 0x%08x, computed 0x%08x\n",
4157 digest, checksum);
4158 /*
4159 * Set the PDU to 0xff so it will intentionally
4160 * hit default in the switch below.
4161 */
4162 memset(buffer, 0xff, ISCSI_HDR_LEN);
4163 atomic_long_inc(&conn->sess->conn_digest_errors);
4164 } else {
4165 pr_debug("Got HeaderDigest CRC32C"
4166 " 0x%08x\n", checksum);
4167 }
4168 }
4169
4170 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4171 goto transport_err;
4172
4173 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4174
4175 if (conn->sess->sess_ops->SessionType &&
4176 ((!(opcode & ISCSI_OP_TEXT)) ||
4177 (!(opcode & ISCSI_OP_LOGOUT)))) {
4178 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4179 " while in Discovery Session, rejecting.\n", opcode);
4180 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4181 buffer);
4182 goto transport_err;
4183 }
4184
4185 ret = iscsi_target_rx_opcode(conn, buffer);
4186 if (ret < 0)
4187 goto transport_err;
4188 }
4189
4190 transport_err:
4191 if (!signal_pending(current))
4192 atomic_set(&conn->transport_failed, 1);
4193 iscsit_take_action_for_connection_exit(conn);
4194 return 0;
4195 }
4196
4197 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4198 {
4199 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4200 struct iscsi_session *sess = conn->sess;
4201 /*
4202 * We expect this function to only ever be called from either RX or TX
4203 * thread context via iscsit_close_connection() once the other context
4204 * has been reset -> returned sleeping pre-handler state.
4205 */
4206 spin_lock_bh(&conn->cmd_lock);
4207 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4208
4209 list_del_init(&cmd->i_conn_node);
4210 spin_unlock_bh(&conn->cmd_lock);
4211
4212 iscsit_increment_maxcmdsn(cmd, sess);
4213
4214 iscsit_free_cmd(cmd, true);
4215
4216 spin_lock_bh(&conn->cmd_lock);
4217 }
4218 spin_unlock_bh(&conn->cmd_lock);
4219 }
4220
4221 static void iscsit_stop_timers_for_cmds(
4222 struct iscsi_conn *conn)
4223 {
4224 struct iscsi_cmd *cmd;
4225
4226 spin_lock_bh(&conn->cmd_lock);
4227 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4228 if (cmd->data_direction == DMA_TO_DEVICE)
4229 iscsit_stop_dataout_timer(cmd);
4230 }
4231 spin_unlock_bh(&conn->cmd_lock);
4232 }
4233
4234 int iscsit_close_connection(
4235 struct iscsi_conn *conn)
4236 {
4237 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4238 struct iscsi_session *sess = conn->sess;
4239
4240 pr_debug("Closing iSCSI connection CID %hu on SID:"
4241 " %u\n", conn->cid, sess->sid);
4242 /*
4243 * Always up conn_logout_comp for the traditional TCP case just in case
4244 * the RX Thread in iscsi_target_rx_opcode() is sleeping and the logout
4245 * response never got sent because the connection failed.
4246 *
4247 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4248 * to signal logout response TX interrupt completion. Go ahead and skip
4249 * this for iser since isert_rx_opcode() does not wait on logout failure,
4250 * and to avoid iscsi_conn pointer dereference in iser-target code.
4251 */
4252 if (conn->conn_transport->transport_type == ISCSI_TCP)
4253 complete(&conn->conn_logout_comp);
4254
4255 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4256 if (conn->tx_thread &&
4257 cmpxchg(&conn->tx_thread_active, true, false)) {
4258 send_sig(SIGINT, conn->tx_thread, 1);
4259 kthread_stop(conn->tx_thread);
4260 }
4261 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4262 if (conn->rx_thread &&
4263 cmpxchg(&conn->rx_thread_active, true, false)) {
4264 send_sig(SIGINT, conn->rx_thread, 1);
4265 kthread_stop(conn->rx_thread);
4266 }
4267 }
4268
4269 spin_lock(&iscsit_global->ts_bitmap_lock);
4270 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4271 get_order(1));
4272 spin_unlock(&iscsit_global->ts_bitmap_lock);
4273
4274 iscsit_stop_timers_for_cmds(conn);
4275 iscsit_stop_nopin_response_timer(conn);
4276 iscsit_stop_nopin_timer(conn);
4277
4278 if (conn->conn_transport->iscsit_wait_conn)
4279 conn->conn_transport->iscsit_wait_conn(conn);
4280
4281 /*
4282 * During Connection recovery drop unacknowledged out of order
4283 * commands for this connection, and prepare the other commands
4284 * for realligence.
4285 *
4286 * During normal operation clear the out of order commands (but
4287 * do not free the struct iscsi_ooo_cmdsn's) and release all
4288 * struct iscsi_cmds.
4289 */
4290 if (atomic_read(&conn->connection_recovery)) {
4291 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4292 iscsit_prepare_cmds_for_realligance(conn);
4293 } else {
4294 iscsit_clear_ooo_cmdsns_for_conn(conn);
4295 iscsit_release_commands_from_conn(conn);
4296 }
4297 iscsit_free_queue_reqs_for_conn(conn);
4298
4299 /*
4300 * Handle decrementing session or connection usage count if
4301 * a logout response was not able to be sent because the
4302 * connection failed. Fall back to Session Recovery here.
4303 */
4304 if (atomic_read(&conn->conn_logout_remove)) {
4305 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4306 iscsit_dec_conn_usage_count(conn);
4307 iscsit_dec_session_usage_count(sess);
4308 }
4309 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4310 iscsit_dec_conn_usage_count(conn);
4311
4312 atomic_set(&conn->conn_logout_remove, 0);
4313 atomic_set(&sess->session_reinstatement, 0);
4314 atomic_set(&sess->session_fall_back_to_erl0, 1);
4315 }
4316
4317 spin_lock_bh(&sess->conn_lock);
4318 list_del(&conn->conn_list);
4319
4320 /*
4321 * Attempt to let the Initiator know this connection failed by
4322 * sending an Connection Dropped Async Message on another
4323 * active connection.
4324 */
4325 if (atomic_read(&conn->connection_recovery))
4326 iscsit_build_conn_drop_async_message(conn);
4327
4328 spin_unlock_bh(&sess->conn_lock);
4329
4330 /*
4331 * If connection reinstatement is being performed on this connection,
4332 * up the connection reinstatement semaphore that is being blocked on
4333 * in iscsit_cause_connection_reinstatement().
4334 */
4335 spin_lock_bh(&conn->state_lock);
4336 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4337 spin_unlock_bh(&conn->state_lock);
4338 complete(&conn->conn_wait_comp);
4339 wait_for_completion(&conn->conn_post_wait_comp);
4340 spin_lock_bh(&conn->state_lock);
4341 }
4342
4343 /*
4344 * If connection reinstatement is being performed on this connection
4345 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4346 * connection wait rcfr semaphore that is being blocked on
4347 * an iscsit_connection_reinstatement_rcfr().
4348 */
4349 if (atomic_read(&conn->connection_wait_rcfr)) {
4350 spin_unlock_bh(&conn->state_lock);
4351 complete(&conn->conn_wait_rcfr_comp);
4352 wait_for_completion(&conn->conn_post_wait_comp);
4353 spin_lock_bh(&conn->state_lock);
4354 }
4355 atomic_set(&conn->connection_reinstatement, 1);
4356 spin_unlock_bh(&conn->state_lock);
4357
4358 /*
4359 * If any other processes are accessing this connection pointer we
4360 * must wait until they have completed.
4361 */
4362 iscsit_check_conn_usage_count(conn);
4363
4364 ahash_request_free(conn->conn_tx_hash);
4365 if (conn->conn_rx_hash) {
4366 struct crypto_ahash *tfm;
4367
4368 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4369 ahash_request_free(conn->conn_rx_hash);
4370 crypto_free_ahash(tfm);
4371 }
4372
4373 free_cpumask_var(conn->conn_cpumask);
4374
4375 kfree(conn->conn_ops);
4376 conn->conn_ops = NULL;
4377
4378 if (conn->sock)
4379 sock_release(conn->sock);
4380
4381 if (conn->conn_transport->iscsit_free_conn)
4382 conn->conn_transport->iscsit_free_conn(conn);
4383
4384 iscsit_put_transport(conn->conn_transport);
4385
4386 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4387 conn->conn_state = TARG_CONN_STATE_FREE;
4388 kfree(conn);
4389
4390 spin_lock_bh(&sess->conn_lock);
4391 atomic_dec(&sess->nconn);
4392 pr_debug("Decremented iSCSI connection count to %hu from node:"
4393 " %s\n", atomic_read(&sess->nconn),
4394 sess->sess_ops->InitiatorName);
4395 /*
4396 * Make sure that if one connection fails in an non ERL=2 iSCSI
4397 * Session that they all fail.
4398 */
4399 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4400 !atomic_read(&sess->session_logout))
4401 atomic_set(&sess->session_fall_back_to_erl0, 1);
4402
4403 /*
4404 * If this was not the last connection in the session, and we are
4405 * performing session reinstatement or falling back to ERL=0, call
4406 * iscsit_stop_session() without sleeping to shutdown the other
4407 * active connections.
4408 */
4409 if (atomic_read(&sess->nconn)) {
4410 if (!atomic_read(&sess->session_reinstatement) &&
4411 !atomic_read(&sess->session_fall_back_to_erl0)) {
4412 spin_unlock_bh(&sess->conn_lock);
4413 return 0;
4414 }
4415 if (!atomic_read(&sess->session_stop_active)) {
4416 atomic_set(&sess->session_stop_active, 1);
4417 spin_unlock_bh(&sess->conn_lock);
4418 iscsit_stop_session(sess, 0, 0);
4419 return 0;
4420 }
4421 spin_unlock_bh(&sess->conn_lock);
4422 return 0;
4423 }
4424
4425 /*
4426 * If this was the last connection in the session and one of the
4427 * following is occurring:
4428 *
4429 * Session Reinstatement is not being performed, and are falling back
4430 * to ERL=0 call iscsit_close_session().
4431 *
4432 * Session Logout was requested. iscsit_close_session() will be called
4433 * elsewhere.
4434 *
4435 * Session Continuation is not being performed, start the Time2Retain
4436 * handler and check if sleep_on_sess_wait_sem is active.
4437 */
4438 if (!atomic_read(&sess->session_reinstatement) &&
4439 atomic_read(&sess->session_fall_back_to_erl0)) {
4440 spin_unlock_bh(&sess->conn_lock);
4441 target_put_session(sess->se_sess);
4442
4443 return 0;
4444 } else if (atomic_read(&sess->session_logout)) {
4445 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4446 sess->session_state = TARG_SESS_STATE_FREE;
4447 spin_unlock_bh(&sess->conn_lock);
4448
4449 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4450 complete(&sess->session_wait_comp);
4451
4452 return 0;
4453 } else {
4454 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4455 sess->session_state = TARG_SESS_STATE_FAILED;
4456
4457 if (!atomic_read(&sess->session_continuation)) {
4458 spin_unlock_bh(&sess->conn_lock);
4459 iscsit_start_time2retain_handler(sess);
4460 } else
4461 spin_unlock_bh(&sess->conn_lock);
4462
4463 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4464 complete(&sess->session_wait_comp);
4465
4466 return 0;
4467 }
4468 }
4469
4470 int iscsit_close_session(struct iscsi_session *sess)
4471 {
4472 struct iscsi_portal_group *tpg = sess->tpg;
4473 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4474
4475 if (atomic_read(&sess->nconn)) {
4476 pr_err("%d connection(s) still exist for iSCSI session"
4477 " to %s\n", atomic_read(&sess->nconn),
4478 sess->sess_ops->InitiatorName);
4479 BUG();
4480 }
4481
4482 spin_lock_bh(&se_tpg->session_lock);
4483 atomic_set(&sess->session_logout, 1);
4484 atomic_set(&sess->session_reinstatement, 1);
4485 iscsit_stop_time2retain_timer(sess);
4486 spin_unlock_bh(&se_tpg->session_lock);
4487
4488 /*
4489 * transport_deregister_session_configfs() will clear the
4490 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4491 * can be setting it again with __transport_register_session() in
4492 * iscsi_post_login_handler() again after the iscsit_stop_session()
4493 * completes in iscsi_np context.
4494 */
4495 transport_deregister_session_configfs(sess->se_sess);
4496
4497 /*
4498 * If any other processes are accessing this session pointer we must
4499 * wait until they have completed. If we are in an interrupt (the
4500 * time2retain handler) and contain and active session usage count we
4501 * restart the timer and exit.
4502 */
4503 if (!in_interrupt()) {
4504 if (iscsit_check_session_usage_count(sess) == 1)
4505 iscsit_stop_session(sess, 1, 1);
4506 } else {
4507 if (iscsit_check_session_usage_count(sess) == 2) {
4508 atomic_set(&sess->session_logout, 0);
4509 iscsit_start_time2retain_handler(sess);
4510 return 0;
4511 }
4512 }
4513
4514 transport_deregister_session(sess->se_sess);
4515
4516 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4517 iscsit_free_connection_recovery_entires(sess);
4518
4519 iscsit_free_all_ooo_cmdsns(sess);
4520
4521 spin_lock_bh(&se_tpg->session_lock);
4522 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4523 sess->session_state = TARG_SESS_STATE_FREE;
4524 pr_debug("Released iSCSI session from node: %s\n",
4525 sess->sess_ops->InitiatorName);
4526 tpg->nsessions--;
4527 if (tpg->tpg_tiqn)
4528 tpg->tpg_tiqn->tiqn_nsessions--;
4529
4530 pr_debug("Decremented number of active iSCSI Sessions on"
4531 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4532
4533 spin_lock(&sess_idr_lock);
4534 idr_remove(&sess_idr, sess->session_index);
4535 spin_unlock(&sess_idr_lock);
4536
4537 kfree(sess->sess_ops);
4538 sess->sess_ops = NULL;
4539 spin_unlock_bh(&se_tpg->session_lock);
4540
4541 kfree(sess);
4542 return 0;
4543 }
4544
4545 static void iscsit_logout_post_handler_closesession(
4546 struct iscsi_conn *conn)
4547 {
4548 struct iscsi_session *sess = conn->sess;
4549 int sleep = 1;
4550 /*
4551 * Traditional iscsi/tcp will invoke this logic from TX thread
4552 * context during session logout, so clear tx_thread_active and
4553 * sleep if iscsit_close_connection() has not already occured.
4554 *
4555 * Since iser-target invokes this logic from it's own workqueue,
4556 * always sleep waiting for RX/TX thread shutdown to complete
4557 * within iscsit_close_connection().
4558 */
4559 if (conn->conn_transport->transport_type == ISCSI_TCP)
4560 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4561
4562 atomic_set(&conn->conn_logout_remove, 0);
4563 complete(&conn->conn_logout_comp);
4564
4565 iscsit_dec_conn_usage_count(conn);
4566 iscsit_stop_session(sess, sleep, sleep);
4567 iscsit_dec_session_usage_count(sess);
4568 target_put_session(sess->se_sess);
4569 }
4570
4571 static void iscsit_logout_post_handler_samecid(
4572 struct iscsi_conn *conn)
4573 {
4574 int sleep = 1;
4575
4576 if (conn->conn_transport->transport_type == ISCSI_TCP)
4577 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4578
4579 atomic_set(&conn->conn_logout_remove, 0);
4580 complete(&conn->conn_logout_comp);
4581
4582 iscsit_cause_connection_reinstatement(conn, sleep);
4583 iscsit_dec_conn_usage_count(conn);
4584 }
4585
4586 static void iscsit_logout_post_handler_diffcid(
4587 struct iscsi_conn *conn,
4588 u16 cid)
4589 {
4590 struct iscsi_conn *l_conn;
4591 struct iscsi_session *sess = conn->sess;
4592 bool conn_found = false;
4593
4594 if (!sess)
4595 return;
4596
4597 spin_lock_bh(&sess->conn_lock);
4598 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4599 if (l_conn->cid == cid) {
4600 iscsit_inc_conn_usage_count(l_conn);
4601 conn_found = true;
4602 break;
4603 }
4604 }
4605 spin_unlock_bh(&sess->conn_lock);
4606
4607 if (!conn_found)
4608 return;
4609
4610 if (l_conn->sock)
4611 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4612
4613 spin_lock_bh(&l_conn->state_lock);
4614 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4615 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4616 spin_unlock_bh(&l_conn->state_lock);
4617
4618 iscsit_cause_connection_reinstatement(l_conn, 1);
4619 iscsit_dec_conn_usage_count(l_conn);
4620 }
4621
4622 /*
4623 * Return of 0 causes the TX thread to restart.
4624 */
4625 int iscsit_logout_post_handler(
4626 struct iscsi_cmd *cmd,
4627 struct iscsi_conn *conn)
4628 {
4629 int ret = 0;
4630
4631 switch (cmd->logout_reason) {
4632 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4633 switch (cmd->logout_response) {
4634 case ISCSI_LOGOUT_SUCCESS:
4635 case ISCSI_LOGOUT_CLEANUP_FAILED:
4636 default:
4637 iscsit_logout_post_handler_closesession(conn);
4638 break;
4639 }
4640 ret = 0;
4641 break;
4642 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4643 if (conn->cid == cmd->logout_cid) {
4644 switch (cmd->logout_response) {
4645 case ISCSI_LOGOUT_SUCCESS:
4646 case ISCSI_LOGOUT_CLEANUP_FAILED:
4647 default:
4648 iscsit_logout_post_handler_samecid(conn);
4649 break;
4650 }
4651 ret = 0;
4652 } else {
4653 switch (cmd->logout_response) {
4654 case ISCSI_LOGOUT_SUCCESS:
4655 iscsit_logout_post_handler_diffcid(conn,
4656 cmd->logout_cid);
4657 break;
4658 case ISCSI_LOGOUT_CID_NOT_FOUND:
4659 case ISCSI_LOGOUT_CLEANUP_FAILED:
4660 default:
4661 break;
4662 }
4663 ret = 1;
4664 }
4665 break;
4666 case ISCSI_LOGOUT_REASON_RECOVERY:
4667 switch (cmd->logout_response) {
4668 case ISCSI_LOGOUT_SUCCESS:
4669 case ISCSI_LOGOUT_CID_NOT_FOUND:
4670 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4671 case ISCSI_LOGOUT_CLEANUP_FAILED:
4672 default:
4673 break;
4674 }
4675 ret = 1;
4676 break;
4677 default:
4678 break;
4679
4680 }
4681 return ret;
4682 }
4683 EXPORT_SYMBOL(iscsit_logout_post_handler);
4684
4685 void iscsit_fail_session(struct iscsi_session *sess)
4686 {
4687 struct iscsi_conn *conn;
4688
4689 spin_lock_bh(&sess->conn_lock);
4690 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4691 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4692 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4693 }
4694 spin_unlock_bh(&sess->conn_lock);
4695
4696 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4697 sess->session_state = TARG_SESS_STATE_FAILED;
4698 }
4699
4700 int iscsit_free_session(struct iscsi_session *sess)
4701 {
4702 u16 conn_count = atomic_read(&sess->nconn);
4703 struct iscsi_conn *conn, *conn_tmp = NULL;
4704 int is_last;
4705
4706 spin_lock_bh(&sess->conn_lock);
4707 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4708
4709 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4710 conn_list) {
4711 if (conn_count == 0)
4712 break;
4713
4714 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4715 is_last = 1;
4716 } else {
4717 iscsit_inc_conn_usage_count(conn_tmp);
4718 is_last = 0;
4719 }
4720 iscsit_inc_conn_usage_count(conn);
4721
4722 spin_unlock_bh(&sess->conn_lock);
4723 iscsit_cause_connection_reinstatement(conn, 1);
4724 spin_lock_bh(&sess->conn_lock);
4725
4726 iscsit_dec_conn_usage_count(conn);
4727 if (is_last == 0)
4728 iscsit_dec_conn_usage_count(conn_tmp);
4729
4730 conn_count--;
4731 }
4732
4733 if (atomic_read(&sess->nconn)) {
4734 spin_unlock_bh(&sess->conn_lock);
4735 wait_for_completion(&sess->session_wait_comp);
4736 } else
4737 spin_unlock_bh(&sess->conn_lock);
4738
4739 target_put_session(sess->se_sess);
4740 return 0;
4741 }
4742
4743 void iscsit_stop_session(
4744 struct iscsi_session *sess,
4745 int session_sleep,
4746 int connection_sleep)
4747 {
4748 u16 conn_count = atomic_read(&sess->nconn);
4749 struct iscsi_conn *conn, *conn_tmp = NULL;
4750 int is_last;
4751
4752 spin_lock_bh(&sess->conn_lock);
4753 if (session_sleep)
4754 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4755
4756 if (connection_sleep) {
4757 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4758 conn_list) {
4759 if (conn_count == 0)
4760 break;
4761
4762 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4763 is_last = 1;
4764 } else {
4765 iscsit_inc_conn_usage_count(conn_tmp);
4766 is_last = 0;
4767 }
4768 iscsit_inc_conn_usage_count(conn);
4769
4770 spin_unlock_bh(&sess->conn_lock);
4771 iscsit_cause_connection_reinstatement(conn, 1);
4772 spin_lock_bh(&sess->conn_lock);
4773
4774 iscsit_dec_conn_usage_count(conn);
4775 if (is_last == 0)
4776 iscsit_dec_conn_usage_count(conn_tmp);
4777 conn_count--;
4778 }
4779 } else {
4780 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4781 iscsit_cause_connection_reinstatement(conn, 0);
4782 }
4783
4784 if (session_sleep && atomic_read(&sess->nconn)) {
4785 spin_unlock_bh(&sess->conn_lock);
4786 wait_for_completion(&sess->session_wait_comp);
4787 } else
4788 spin_unlock_bh(&sess->conn_lock);
4789 }
4790
4791 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4792 {
4793 struct iscsi_session *sess;
4794 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4795 struct se_session *se_sess, *se_sess_tmp;
4796 LIST_HEAD(free_list);
4797 int session_count = 0;
4798
4799 spin_lock_bh(&se_tpg->session_lock);
4800 if (tpg->nsessions && !force) {
4801 spin_unlock_bh(&se_tpg->session_lock);
4802 return -1;
4803 }
4804
4805 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4806 sess_list) {
4807 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4808
4809 spin_lock(&sess->conn_lock);
4810 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4811 atomic_read(&sess->session_logout) ||
4812 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4813 spin_unlock(&sess->conn_lock);
4814 continue;
4815 }
4816 atomic_set(&sess->session_reinstatement, 1);
4817 spin_unlock(&sess->conn_lock);
4818
4819 list_move_tail(&se_sess->sess_list, &free_list);
4820 }
4821 spin_unlock_bh(&se_tpg->session_lock);
4822
4823 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4824 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4825
4826 iscsit_free_session(sess);
4827 session_count++;
4828 }
4829
4830 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4831 " Group: %hu\n", session_count, tpg->tpgt);
4832 return 0;
4833 }
4834
4835 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4836 MODULE_VERSION("4.1.x");
4837 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4838 MODULE_LICENSE("GPL");
4839
4840 module_init(iscsi_target_init_module);
4841 module_exit(iscsi_target_cleanup_module);
Linux with added FPC-III support