]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - drivers/target/iscsi/iscsi_target.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:


34871a628b11124e093231694b0b0fb14b62de80
[mirror_ubuntu-bionic-kernel.git] / drivers / target / iscsi / iscsi_target.c
1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19 #include <linux/string.h>
20 #include <linux/kthread.h>
21 #include <linux/crypto.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/idr.h>
25 #include <asm/unaligned.h>
26 #include <scsi/scsi_device.h>
27 #include <scsi/iscsi_proto.h>
28 #include <scsi/scsi_tcq.h>
29 #include <target/target_core_base.h>
30 #include <target/target_core_fabric.h>
31 #include <target/target_core_configfs.h>
32
33 #include <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) || signal_pending(current))
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 __kernel_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;
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 } else {
292 sock_in = (struct sockaddr_in *)sockaddr;
293 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
294
295 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
296 ip_match = true;
297
298 port = ntohs(sock_in->sin_port);
299 }
300
301 if (ip_match && (np->np_port == port) &&
302 (np->np_network_transport == network_transport))
303 return true;
304
305 return false;
306 }
307
308 /*
309 * Called with mutex np_lock held
310 */
311 static struct iscsi_np *iscsit_get_np(
312 struct __kernel_sockaddr_storage *sockaddr,
313 int network_transport)
314 {
315 struct iscsi_np *np;
316 bool match;
317
318 list_for_each_entry(np, &g_np_list, np_list) {
319 spin_lock_bh(&np->np_thread_lock);
320 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
321 spin_unlock_bh(&np->np_thread_lock);
322 continue;
323 }
324
325 match = iscsit_check_np_match(sockaddr, np, network_transport);
326 if (match) {
327 /*
328 * Increment the np_exports reference count now to
329 * prevent iscsit_del_np() below from being called
330 * while iscsi_tpg_add_network_portal() is called.
331 */
332 np->np_exports++;
333 spin_unlock_bh(&np->np_thread_lock);
334 return np;
335 }
336 spin_unlock_bh(&np->np_thread_lock);
337 }
338
339 return NULL;
340 }
341
342 struct iscsi_np *iscsit_add_np(
343 struct __kernel_sockaddr_storage *sockaddr,
344 char *ip_str,
345 int network_transport)
346 {
347 struct sockaddr_in *sock_in;
348 struct sockaddr_in6 *sock_in6;
349 struct iscsi_np *np;
350 int ret;
351
352 mutex_lock(&np_lock);
353
354 /*
355 * Locate the existing struct iscsi_np if already active..
356 */
357 np = iscsit_get_np(sockaddr, network_transport);
358 if (np) {
359 mutex_unlock(&np_lock);
360 return np;
361 }
362
363 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
364 if (!np) {
365 pr_err("Unable to allocate memory for struct iscsi_np\n");
366 mutex_unlock(&np_lock);
367 return ERR_PTR(-ENOMEM);
368 }
369
370 np->np_flags |= NPF_IP_NETWORK;
371 if (sockaddr->ss_family == AF_INET6) {
372 sock_in6 = (struct sockaddr_in6 *)sockaddr;
373 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
374 np->np_port = ntohs(sock_in6->sin6_port);
375 } else {
376 sock_in = (struct sockaddr_in *)sockaddr;
377 sprintf(np->np_ip, "%s", ip_str);
378 np->np_port = ntohs(sock_in->sin_port);
379 }
380
381 np->np_network_transport = network_transport;
382 spin_lock_init(&np->np_thread_lock);
383 init_completion(&np->np_restart_comp);
384 INIT_LIST_HEAD(&np->np_list);
385
386 ret = iscsi_target_setup_login_socket(np, sockaddr);
387 if (ret != 0) {
388 kfree(np);
389 mutex_unlock(&np_lock);
390 return ERR_PTR(ret);
391 }
392
393 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
394 if (IS_ERR(np->np_thread)) {
395 pr_err("Unable to create kthread: iscsi_np\n");
396 ret = PTR_ERR(np->np_thread);
397 kfree(np);
398 mutex_unlock(&np_lock);
399 return ERR_PTR(ret);
400 }
401 /*
402 * Increment the np_exports reference count now to prevent
403 * iscsit_del_np() below from being run while a new call to
404 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
405 * active. We don't need to hold np->np_thread_lock at this
406 * point because iscsi_np has not been added to g_np_list yet.
407 */
408 np->np_exports = 1;
409 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
410
411 list_add_tail(&np->np_list, &g_np_list);
412 mutex_unlock(&np_lock);
413
414 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
415 np->np_ip, np->np_port, np->np_transport->name);
416
417 return np;
418 }
419
420 int iscsit_reset_np_thread(
421 struct iscsi_np *np,
422 struct iscsi_tpg_np *tpg_np,
423 struct iscsi_portal_group *tpg,
424 bool shutdown)
425 {
426 spin_lock_bh(&np->np_thread_lock);
427 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
428 spin_unlock_bh(&np->np_thread_lock);
429 return 0;
430 }
431 np->np_thread_state = ISCSI_NP_THREAD_RESET;
432
433 if (np->np_thread) {
434 spin_unlock_bh(&np->np_thread_lock);
435 send_sig(SIGINT, np->np_thread, 1);
436 wait_for_completion(&np->np_restart_comp);
437 spin_lock_bh(&np->np_thread_lock);
438 }
439 spin_unlock_bh(&np->np_thread_lock);
440
441 if (tpg_np && shutdown) {
442 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
443
444 wait_for_completion(&tpg_np->tpg_np_comp);
445 }
446
447 return 0;
448 }
449
450 static void iscsit_free_np(struct iscsi_np *np)
451 {
452 if (np->np_socket)
453 sock_release(np->np_socket);
454 }
455
456 int iscsit_del_np(struct iscsi_np *np)
457 {
458 spin_lock_bh(&np->np_thread_lock);
459 np->np_exports--;
460 if (np->np_exports) {
461 np->enabled = true;
462 spin_unlock_bh(&np->np_thread_lock);
463 return 0;
464 }
465 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
466 spin_unlock_bh(&np->np_thread_lock);
467
468 if (np->np_thread) {
469 /*
470 * We need to send the signal to wakeup Linux/Net
471 * which may be sleeping in sock_accept()..
472 */
473 send_sig(SIGINT, np->np_thread, 1);
474 kthread_stop(np->np_thread);
475 np->np_thread = NULL;
476 }
477
478 np->np_transport->iscsit_free_np(np);
479
480 mutex_lock(&np_lock);
481 list_del(&np->np_list);
482 mutex_unlock(&np_lock);
483
484 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
485 np->np_ip, np->np_port, np->np_transport->name);
486
487 iscsit_put_transport(np->np_transport);
488 kfree(np);
489 return 0;
490 }
491
492 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
493 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
494
495 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
496 {
497 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
498 return 0;
499 }
500
501 static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
502 {
503 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
504
505 spin_lock_bh(&conn->cmd_lock);
506 if (!list_empty(&cmd->i_conn_node))
507 list_del_init(&cmd->i_conn_node);
508 spin_unlock_bh(&conn->cmd_lock);
509
510 __iscsit_free_cmd(cmd, scsi_cmd, true);
511 }
512
513 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
514 {
515 return TARGET_PROT_NORMAL;
516 }
517
518 static struct iscsit_transport iscsi_target_transport = {
519 .name = "iSCSI/TCP",
520 .transport_type = ISCSI_TCP,
521 .owner = NULL,
522 .iscsit_setup_np = iscsit_setup_np,
523 .iscsit_accept_np = iscsit_accept_np,
524 .iscsit_free_np = iscsit_free_np,
525 .iscsit_get_login_rx = iscsit_get_login_rx,
526 .iscsit_put_login_tx = iscsit_put_login_tx,
527 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
528 .iscsit_immediate_queue = iscsit_immediate_queue,
529 .iscsit_response_queue = iscsit_response_queue,
530 .iscsit_queue_data_in = iscsit_queue_rsp,
531 .iscsit_queue_status = iscsit_queue_rsp,
532 .iscsit_aborted_task = iscsit_aborted_task,
533 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
534 };
535
536 static int __init iscsi_target_init_module(void)
537 {
538 int ret = 0, size;
539
540 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
541
542 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
543 if (!iscsit_global) {
544 pr_err("Unable to allocate memory for iscsit_global\n");
545 return -1;
546 }
547 spin_lock_init(&iscsit_global->ts_bitmap_lock);
548 mutex_init(&auth_id_lock);
549 spin_lock_init(&sess_idr_lock);
550 idr_init(&tiqn_idr);
551 idr_init(&sess_idr);
552
553 ret = target_register_template(&iscsi_ops);
554 if (ret)
555 goto out;
556
557 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
558 iscsit_global->ts_bitmap = vzalloc(size);
559 if (!iscsit_global->ts_bitmap) {
560 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
561 goto configfs_out;
562 }
563
564 lio_qr_cache = kmem_cache_create("lio_qr_cache",
565 sizeof(struct iscsi_queue_req),
566 __alignof__(struct iscsi_queue_req), 0, NULL);
567 if (!lio_qr_cache) {
568 pr_err("nable to kmem_cache_create() for"
569 " lio_qr_cache\n");
570 goto bitmap_out;
571 }
572
573 lio_dr_cache = kmem_cache_create("lio_dr_cache",
574 sizeof(struct iscsi_datain_req),
575 __alignof__(struct iscsi_datain_req), 0, NULL);
576 if (!lio_dr_cache) {
577 pr_err("Unable to kmem_cache_create() for"
578 " lio_dr_cache\n");
579 goto qr_out;
580 }
581
582 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
583 sizeof(struct iscsi_ooo_cmdsn),
584 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
585 if (!lio_ooo_cache) {
586 pr_err("Unable to kmem_cache_create() for"
587 " lio_ooo_cache\n");
588 goto dr_out;
589 }
590
591 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
592 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
593 0, NULL);
594 if (!lio_r2t_cache) {
595 pr_err("Unable to kmem_cache_create() for"
596 " lio_r2t_cache\n");
597 goto ooo_out;
598 }
599
600 iscsit_register_transport(&iscsi_target_transport);
601
602 if (iscsit_load_discovery_tpg() < 0)
603 goto r2t_out;
604
605 return ret;
606 r2t_out:
607 iscsit_unregister_transport(&iscsi_target_transport);
608 kmem_cache_destroy(lio_r2t_cache);
609 ooo_out:
610 kmem_cache_destroy(lio_ooo_cache);
611 dr_out:
612 kmem_cache_destroy(lio_dr_cache);
613 qr_out:
614 kmem_cache_destroy(lio_qr_cache);
615 bitmap_out:
616 vfree(iscsit_global->ts_bitmap);
617 configfs_out:
618 /* XXX: this probably wants it to be it's own unwind step.. */
619 if (iscsit_global->discovery_tpg)
620 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
621 target_unregister_template(&iscsi_ops);
622 out:
623 kfree(iscsit_global);
624 return -ENOMEM;
625 }
626
627 static void __exit iscsi_target_cleanup_module(void)
628 {
629 iscsit_release_discovery_tpg();
630 iscsit_unregister_transport(&iscsi_target_transport);
631 kmem_cache_destroy(lio_qr_cache);
632 kmem_cache_destroy(lio_dr_cache);
633 kmem_cache_destroy(lio_ooo_cache);
634 kmem_cache_destroy(lio_r2t_cache);
635
636 /*
637 * Shutdown discovery sessions and disable discovery TPG
638 */
639 if (iscsit_global->discovery_tpg)
640 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
641
642 target_unregister_template(&iscsi_ops);
643
644 vfree(iscsit_global->ts_bitmap);
645 kfree(iscsit_global);
646 }
647
648 static int iscsit_add_reject(
649 struct iscsi_conn *conn,
650 u8 reason,
651 unsigned char *buf)
652 {
653 struct iscsi_cmd *cmd;
654
655 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
656 if (!cmd)
657 return -1;
658
659 cmd->iscsi_opcode = ISCSI_OP_REJECT;
660 cmd->reject_reason = reason;
661
662 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
663 if (!cmd->buf_ptr) {
664 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
665 iscsit_free_cmd(cmd, false);
666 return -1;
667 }
668
669 spin_lock_bh(&conn->cmd_lock);
670 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
671 spin_unlock_bh(&conn->cmd_lock);
672
673 cmd->i_state = ISTATE_SEND_REJECT;
674 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
675
676 return -1;
677 }
678
679 static int iscsit_add_reject_from_cmd(
680 struct iscsi_cmd *cmd,
681 u8 reason,
682 bool add_to_conn,
683 unsigned char *buf)
684 {
685 struct iscsi_conn *conn;
686
687 if (!cmd->conn) {
688 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
689 cmd->init_task_tag);
690 return -1;
691 }
692 conn = cmd->conn;
693
694 cmd->iscsi_opcode = ISCSI_OP_REJECT;
695 cmd->reject_reason = reason;
696
697 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
698 if (!cmd->buf_ptr) {
699 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
700 iscsit_free_cmd(cmd, false);
701 return -1;
702 }
703
704 if (add_to_conn) {
705 spin_lock_bh(&conn->cmd_lock);
706 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
707 spin_unlock_bh(&conn->cmd_lock);
708 }
709
710 cmd->i_state = ISTATE_SEND_REJECT;
711 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
712 /*
713 * Perform the kref_put now if se_cmd has already been setup by
714 * scsit_setup_scsi_cmd()
715 */
716 if (cmd->se_cmd.se_tfo != NULL) {
717 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
718 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
719 }
720 return -1;
721 }
722
723 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
724 unsigned char *buf)
725 {
726 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
727 }
728
729 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
730 {
731 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
732 }
733
734 /*
735 * Map some portion of the allocated scatterlist to an iovec, suitable for
736 * kernel sockets to copy data in/out.
737 */
738 static int iscsit_map_iovec(
739 struct iscsi_cmd *cmd,
740 struct kvec *iov,
741 u32 data_offset,
742 u32 data_length)
743 {
744 u32 i = 0;
745 struct scatterlist *sg;
746 unsigned int page_off;
747
748 /*
749 * We know each entry in t_data_sg contains a page.
750 */
751 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
752 page_off = (data_offset % PAGE_SIZE);
753
754 cmd->first_data_sg = sg;
755 cmd->first_data_sg_off = page_off;
756
757 while (data_length) {
758 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
759
760 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
761 iov[i].iov_len = cur_len;
762
763 data_length -= cur_len;
764 page_off = 0;
765 sg = sg_next(sg);
766 i++;
767 }
768
769 cmd->kmapped_nents = i;
770
771 return i;
772 }
773
774 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
775 {
776 u32 i;
777 struct scatterlist *sg;
778
779 sg = cmd->first_data_sg;
780
781 for (i = 0; i < cmd->kmapped_nents; i++)
782 kunmap(sg_page(&sg[i]));
783 }
784
785 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
786 {
787 LIST_HEAD(ack_list);
788 struct iscsi_cmd *cmd, *cmd_p;
789
790 conn->exp_statsn = exp_statsn;
791
792 if (conn->sess->sess_ops->RDMAExtensions)
793 return;
794
795 spin_lock_bh(&conn->cmd_lock);
796 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
797 spin_lock(&cmd->istate_lock);
798 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
799 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
800 cmd->i_state = ISTATE_REMOVE;
801 spin_unlock(&cmd->istate_lock);
802 list_move_tail(&cmd->i_conn_node, &ack_list);
803 continue;
804 }
805 spin_unlock(&cmd->istate_lock);
806 }
807 spin_unlock_bh(&conn->cmd_lock);
808
809 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
810 list_del_init(&cmd->i_conn_node);
811 iscsit_free_cmd(cmd, false);
812 }
813 }
814
815 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
816 {
817 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
818
819 iov_count += ISCSI_IOV_DATA_BUFFER;
820
821 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
822 if (!cmd->iov_data) {
823 pr_err("Unable to allocate cmd->iov_data\n");
824 return -ENOMEM;
825 }
826
827 cmd->orig_iov_data_count = iov_count;
828 return 0;
829 }
830
831 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
832 unsigned char *buf)
833 {
834 int data_direction, payload_length;
835 struct iscsi_scsi_req *hdr;
836 int iscsi_task_attr;
837 int sam_task_attr;
838
839 atomic_long_inc(&conn->sess->cmd_pdus);
840
841 hdr = (struct iscsi_scsi_req *) buf;
842 payload_length = ntoh24(hdr->dlength);
843
844 /* FIXME; Add checks for AdditionalHeaderSegment */
845
846 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
847 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
848 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
849 " not set. Bad iSCSI Initiator.\n");
850 return iscsit_add_reject_cmd(cmd,
851 ISCSI_REASON_BOOKMARK_INVALID, buf);
852 }
853
854 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
855 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
856 /*
857 * From RFC-3720 Section 10.3.1:
858 *
859 * "Either or both of R and W MAY be 1 when either the
860 * Expected Data Transfer Length and/or Bidirectional Read
861 * Expected Data Transfer Length are 0"
862 *
863 * For this case, go ahead and clear the unnecssary bits
864 * to avoid any confusion with ->data_direction.
865 */
866 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
867 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
868
869 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
870 " set when Expected Data Transfer Length is 0 for"
871 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
872 }
873
874 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
875 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
876 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
877 " MUST be set if Expected Data Transfer Length is not 0."
878 " Bad iSCSI Initiator\n");
879 return iscsit_add_reject_cmd(cmd,
880 ISCSI_REASON_BOOKMARK_INVALID, buf);
881 }
882
883 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
884 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
885 pr_err("Bidirectional operations not supported!\n");
886 return iscsit_add_reject_cmd(cmd,
887 ISCSI_REASON_BOOKMARK_INVALID, buf);
888 }
889
890 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
891 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
892 " Scsi Command PDU.\n");
893 return iscsit_add_reject_cmd(cmd,
894 ISCSI_REASON_BOOKMARK_INVALID, buf);
895 }
896
897 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
898 pr_err("ImmediateData=No but DataSegmentLength=%u,"
899 " protocol error.\n", payload_length);
900 return iscsit_add_reject_cmd(cmd,
901 ISCSI_REASON_PROTOCOL_ERROR, buf);
902 }
903
904 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
905 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
906 pr_err("Expected Data Transfer Length and Length of"
907 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
908 " bit is not set protocol error\n");
909 return iscsit_add_reject_cmd(cmd,
910 ISCSI_REASON_PROTOCOL_ERROR, buf);
911 }
912
913 if (payload_length > be32_to_cpu(hdr->data_length)) {
914 pr_err("DataSegmentLength: %u is greater than"
915 " EDTL: %u, protocol error.\n", payload_length,
916 hdr->data_length);
917 return iscsit_add_reject_cmd(cmd,
918 ISCSI_REASON_PROTOCOL_ERROR, buf);
919 }
920
921 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
922 pr_err("DataSegmentLength: %u is greater than"
923 " MaxXmitDataSegmentLength: %u, protocol error.\n",
924 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
925 return iscsit_add_reject_cmd(cmd,
926 ISCSI_REASON_PROTOCOL_ERROR, buf);
927 }
928
929 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
930 pr_err("DataSegmentLength: %u is greater than"
931 " FirstBurstLength: %u, protocol error.\n",
932 payload_length, conn->sess->sess_ops->FirstBurstLength);
933 return iscsit_add_reject_cmd(cmd,
934 ISCSI_REASON_BOOKMARK_INVALID, buf);
935 }
936
937 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
938 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
939 DMA_NONE;
940
941 cmd->data_direction = data_direction;
942 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
943 /*
944 * Figure out the SAM Task Attribute for the incoming SCSI CDB
945 */
946 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
947 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
948 sam_task_attr = TCM_SIMPLE_TAG;
949 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
950 sam_task_attr = TCM_ORDERED_TAG;
951 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
952 sam_task_attr = TCM_HEAD_TAG;
953 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
954 sam_task_attr = TCM_ACA_TAG;
955 else {
956 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
957 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
958 sam_task_attr = TCM_SIMPLE_TAG;
959 }
960
961 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
962 cmd->i_state = ISTATE_NEW_CMD;
963 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
964 cmd->immediate_data = (payload_length) ? 1 : 0;
965 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
966 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
967 if (cmd->unsolicited_data)
968 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
969
970 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
971 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
972 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
973 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
974 cmd->targ_xfer_tag = 0xFFFFFFFF;
975 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
976 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
977 cmd->first_burst_len = payload_length;
978
979 if (!conn->sess->sess_ops->RDMAExtensions &&
980 cmd->data_direction == DMA_FROM_DEVICE) {
981 struct iscsi_datain_req *dr;
982
983 dr = iscsit_allocate_datain_req();
984 if (!dr)
985 return iscsit_add_reject_cmd(cmd,
986 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
987
988 iscsit_attach_datain_req(cmd, dr);
989 }
990
991 /*
992 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
993 */
994 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
995 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
996 cmd->data_direction, sam_task_attr,
997 cmd->sense_buffer + 2);
998
999 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1000 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1001 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1002 conn->cid);
1003
1004 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1005
1006 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1007 scsilun_to_int(&hdr->lun));
1008 if (cmd->sense_reason)
1009 goto attach_cmd;
1010
1011 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1012 if (cmd->sense_reason) {
1013 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1014 return iscsit_add_reject_cmd(cmd,
1015 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1016 }
1017
1018 goto attach_cmd;
1019 }
1020
1021 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1022 return iscsit_add_reject_cmd(cmd,
1023 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1024 }
1025
1026 attach_cmd:
1027 spin_lock_bh(&conn->cmd_lock);
1028 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1029 spin_unlock_bh(&conn->cmd_lock);
1030 /*
1031 * Check if we need to delay processing because of ALUA
1032 * Active/NonOptimized primary access state..
1033 */
1034 core_alua_check_nonop_delay(&cmd->se_cmd);
1035
1036 return 0;
1037 }
1038 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1039
1040 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1041 {
1042 iscsit_set_dataout_sequence_values(cmd);
1043
1044 spin_lock_bh(&cmd->dataout_timeout_lock);
1045 iscsit_start_dataout_timer(cmd, cmd->conn);
1046 spin_unlock_bh(&cmd->dataout_timeout_lock);
1047 }
1048 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1049
1050 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1051 struct iscsi_scsi_req *hdr)
1052 {
1053 int cmdsn_ret = 0;
1054 /*
1055 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1056 * the Immediate Bit is not set, and no Immediate
1057 * Data is attached.
1058 *
1059 * A PDU/CmdSN carrying Immediate Data can only
1060 * be processed after the DataCRC has passed.
1061 * If the DataCRC fails, the CmdSN MUST NOT
1062 * be acknowledged. (See below)
1063 */
1064 if (!cmd->immediate_data) {
1065 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1066 (unsigned char *)hdr, hdr->cmdsn);
1067 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1068 return -1;
1069 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1070 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1071 return 0;
1072 }
1073 }
1074
1075 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1076
1077 /*
1078 * If no Immediate Data is attached, it's OK to return now.
1079 */
1080 if (!cmd->immediate_data) {
1081 if (!cmd->sense_reason && cmd->unsolicited_data)
1082 iscsit_set_unsoliticed_dataout(cmd);
1083 if (!cmd->sense_reason)
1084 return 0;
1085
1086 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1087 return 0;
1088 }
1089
1090 /*
1091 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1092 * execution. These exceptions are processed in CmdSN order using
1093 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1094 */
1095 if (cmd->sense_reason) {
1096 if (cmd->reject_reason)
1097 return 0;
1098
1099 return 1;
1100 }
1101 /*
1102 * Call directly into transport_generic_new_cmd() to perform
1103 * the backend memory allocation.
1104 */
1105 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1106 if (cmd->sense_reason)
1107 return 1;
1108
1109 return 0;
1110 }
1111 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1112
1113 static int
1114 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1115 bool dump_payload)
1116 {
1117 struct iscsi_conn *conn = cmd->conn;
1118 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1119 /*
1120 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1121 */
1122 if (dump_payload)
1123 goto after_immediate_data;
1124
1125 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1126 cmd->first_burst_len);
1127 after_immediate_data:
1128 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1129 /*
1130 * A PDU/CmdSN carrying Immediate Data passed
1131 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1132 * Immediate Bit is not set.
1133 */
1134 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1135 (unsigned char *)hdr, hdr->cmdsn);
1136 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1137 return -1;
1138
1139 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1140 int rc;
1141
1142 rc = iscsit_dump_data_payload(cmd->conn,
1143 cmd->first_burst_len, 1);
1144 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1145 return rc;
1146 } else if (cmd->unsolicited_data)
1147 iscsit_set_unsoliticed_dataout(cmd);
1148
1149 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1150 /*
1151 * Immediate Data failed DataCRC and ERL>=1,
1152 * silently drop this PDU and let the initiator
1153 * plug the CmdSN gap.
1154 *
1155 * FIXME: Send Unsolicited NOPIN with reserved
1156 * TTT here to help the initiator figure out
1157 * the missing CmdSN, although they should be
1158 * intelligent enough to determine the missing
1159 * CmdSN and issue a retry to plug the sequence.
1160 */
1161 cmd->i_state = ISTATE_REMOVE;
1162 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1163 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1164 return -1;
1165
1166 return 0;
1167 }
1168
1169 static int
1170 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1171 unsigned char *buf)
1172 {
1173 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1174 int rc, immed_data;
1175 bool dump_payload = false;
1176
1177 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1178 if (rc < 0)
1179 return 0;
1180 /*
1181 * Allocation iovecs needed for struct socket operations for
1182 * traditional iSCSI block I/O.
1183 */
1184 if (iscsit_allocate_iovecs(cmd) < 0) {
1185 return iscsit_reject_cmd(cmd,
1186 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1187 }
1188 immed_data = cmd->immediate_data;
1189
1190 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1191 if (rc < 0)
1192 return rc;
1193 else if (rc > 0)
1194 dump_payload = true;
1195
1196 if (!immed_data)
1197 return 0;
1198
1199 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1200 }
1201
1202 static u32 iscsit_do_crypto_hash_sg(
1203 struct hash_desc *hash,
1204 struct iscsi_cmd *cmd,
1205 u32 data_offset,
1206 u32 data_length,
1207 u32 padding,
1208 u8 *pad_bytes)
1209 {
1210 u32 data_crc;
1211 u32 i;
1212 struct scatterlist *sg;
1213 unsigned int page_off;
1214
1215 crypto_hash_init(hash);
1216
1217 sg = cmd->first_data_sg;
1218 page_off = cmd->first_data_sg_off;
1219
1220 i = 0;
1221 while (data_length) {
1222 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1223
1224 crypto_hash_update(hash, &sg[i], cur_len);
1225
1226 data_length -= cur_len;
1227 page_off = 0;
1228 i++;
1229 }
1230
1231 if (padding) {
1232 struct scatterlist pad_sg;
1233
1234 sg_init_one(&pad_sg, pad_bytes, padding);
1235 crypto_hash_update(hash, &pad_sg, padding);
1236 }
1237 crypto_hash_final(hash, (u8 *) &data_crc);
1238
1239 return data_crc;
1240 }
1241
1242 static void iscsit_do_crypto_hash_buf(
1243 struct hash_desc *hash,
1244 const void *buf,
1245 u32 payload_length,
1246 u32 padding,
1247 u8 *pad_bytes,
1248 u8 *data_crc)
1249 {
1250 struct scatterlist sg;
1251
1252 crypto_hash_init(hash);
1253
1254 sg_init_one(&sg, buf, payload_length);
1255 crypto_hash_update(hash, &sg, payload_length);
1256
1257 if (padding) {
1258 sg_init_one(&sg, pad_bytes, padding);
1259 crypto_hash_update(hash, &sg, padding);
1260 }
1261 crypto_hash_final(hash, data_crc);
1262 }
1263
1264 int
1265 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1266 struct iscsi_cmd **out_cmd)
1267 {
1268 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1269 struct iscsi_cmd *cmd = NULL;
1270 struct se_cmd *se_cmd;
1271 u32 payload_length = ntoh24(hdr->dlength);
1272 int rc;
1273
1274 if (!payload_length) {
1275 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1276 return 0;
1277 }
1278
1279 /* iSCSI write */
1280 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1281
1282 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1283 pr_err("DataSegmentLength: %u is greater than"
1284 " MaxXmitDataSegmentLength: %u\n", payload_length,
1285 conn->conn_ops->MaxXmitDataSegmentLength);
1286 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1287 buf);
1288 }
1289
1290 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1291 payload_length);
1292 if (!cmd)
1293 return 0;
1294
1295 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1296 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1297 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1298 payload_length, conn->cid);
1299
1300 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1301 pr_err("Command ITT: 0x%08x received DataOUT after"
1302 " last DataOUT received, dumping payload\n",
1303 cmd->init_task_tag);
1304 return iscsit_dump_data_payload(conn, payload_length, 1);
1305 }
1306
1307 if (cmd->data_direction != DMA_TO_DEVICE) {
1308 pr_err("Command ITT: 0x%08x received DataOUT for a"
1309 " NON-WRITE command.\n", cmd->init_task_tag);
1310 return iscsit_dump_data_payload(conn, payload_length, 1);
1311 }
1312 se_cmd = &cmd->se_cmd;
1313 iscsit_mod_dataout_timer(cmd);
1314
1315 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1316 pr_err("DataOut Offset: %u, Length %u greater than"
1317 " iSCSI Command EDTL %u, protocol error.\n",
1318 hdr->offset, payload_length, cmd->se_cmd.data_length);
1319 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1320 }
1321
1322 if (cmd->unsolicited_data) {
1323 int dump_unsolicited_data = 0;
1324
1325 if (conn->sess->sess_ops->InitialR2T) {
1326 pr_err("Received unexpected unsolicited data"
1327 " while InitialR2T=Yes, protocol error.\n");
1328 transport_send_check_condition_and_sense(&cmd->se_cmd,
1329 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1330 return -1;
1331 }
1332 /*
1333 * Special case for dealing with Unsolicited DataOUT
1334 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1335 * failures;
1336 */
1337
1338 /* Something's amiss if we're not in WRITE_PENDING state... */
1339 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1340 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1341 dump_unsolicited_data = 1;
1342
1343 if (dump_unsolicited_data) {
1344 /*
1345 * Check if a delayed TASK_ABORTED status needs to
1346 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1347 * received with the unsolicitied data out.
1348 */
1349 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1350 iscsit_stop_dataout_timer(cmd);
1351
1352 transport_check_aborted_status(se_cmd,
1353 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1354 return iscsit_dump_data_payload(conn, payload_length, 1);
1355 }
1356 } else {
1357 /*
1358 * For the normal solicited data path:
1359 *
1360 * Check for a delayed TASK_ABORTED status and dump any
1361 * incoming data out payload if one exists. Also, when the
1362 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1363 * data out sequence, we decrement outstanding_r2ts. Once
1364 * outstanding_r2ts reaches zero, go ahead and send the delayed
1365 * TASK_ABORTED status.
1366 */
1367 if (se_cmd->transport_state & CMD_T_ABORTED) {
1368 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1369 if (--cmd->outstanding_r2ts < 1) {
1370 iscsit_stop_dataout_timer(cmd);
1371 transport_check_aborted_status(
1372 se_cmd, 1);
1373 }
1374
1375 return iscsit_dump_data_payload(conn, payload_length, 1);
1376 }
1377 }
1378 /*
1379 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1380 * within-command recovery checks before receiving the payload.
1381 */
1382 rc = iscsit_check_pre_dataout(cmd, buf);
1383 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1384 return 0;
1385 else if (rc == DATAOUT_CANNOT_RECOVER)
1386 return -1;
1387
1388 *out_cmd = cmd;
1389 return 0;
1390 }
1391 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1392
1393 static int
1394 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1395 struct iscsi_data *hdr)
1396 {
1397 struct kvec *iov;
1398 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1399 u32 payload_length = ntoh24(hdr->dlength);
1400 int iov_ret, data_crc_failed = 0;
1401
1402 rx_size += payload_length;
1403 iov = &cmd->iov_data[0];
1404
1405 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1406 payload_length);
1407 if (iov_ret < 0)
1408 return -1;
1409
1410 iov_count += iov_ret;
1411
1412 padding = ((-payload_length) & 3);
1413 if (padding != 0) {
1414 iov[iov_count].iov_base = cmd->pad_bytes;
1415 iov[iov_count++].iov_len = padding;
1416 rx_size += padding;
1417 pr_debug("Receiving %u padding bytes.\n", padding);
1418 }
1419
1420 if (conn->conn_ops->DataDigest) {
1421 iov[iov_count].iov_base = &checksum;
1422 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1423 rx_size += ISCSI_CRC_LEN;
1424 }
1425
1426 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1427
1428 iscsit_unmap_iovec(cmd);
1429
1430 if (rx_got != rx_size)
1431 return -1;
1432
1433 if (conn->conn_ops->DataDigest) {
1434 u32 data_crc;
1435
1436 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1437 be32_to_cpu(hdr->offset),
1438 payload_length, padding,
1439 cmd->pad_bytes);
1440
1441 if (checksum != data_crc) {
1442 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1443 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1444 " does not match computed 0x%08x\n",
1445 hdr->itt, hdr->offset, payload_length,
1446 hdr->datasn, checksum, data_crc);
1447 data_crc_failed = 1;
1448 } else {
1449 pr_debug("Got CRC32C DataDigest 0x%08x for"
1450 " %u bytes of Data Out\n", checksum,
1451 payload_length);
1452 }
1453 }
1454
1455 return data_crc_failed;
1456 }
1457
1458 int
1459 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1460 bool data_crc_failed)
1461 {
1462 struct iscsi_conn *conn = cmd->conn;
1463 int rc, ooo_cmdsn;
1464 /*
1465 * Increment post receive data and CRC values or perform
1466 * within-command recovery.
1467 */
1468 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1469 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1470 return 0;
1471 else if (rc == DATAOUT_SEND_R2T) {
1472 iscsit_set_dataout_sequence_values(cmd);
1473 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1474 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1475 /*
1476 * Handle extra special case for out of order
1477 * Unsolicited Data Out.
1478 */
1479 spin_lock_bh(&cmd->istate_lock);
1480 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1481 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1482 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1483 spin_unlock_bh(&cmd->istate_lock);
1484
1485 iscsit_stop_dataout_timer(cmd);
1486 if (ooo_cmdsn)
1487 return 0;
1488 target_execute_cmd(&cmd->se_cmd);
1489 return 0;
1490 } else /* DATAOUT_CANNOT_RECOVER */
1491 return -1;
1492
1493 return 0;
1494 }
1495 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1496
1497 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1498 {
1499 struct iscsi_cmd *cmd = NULL;
1500 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1501 int rc;
1502 bool data_crc_failed = false;
1503
1504 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1505 if (rc < 0)
1506 return 0;
1507 else if (!cmd)
1508 return 0;
1509
1510 rc = iscsit_get_dataout(conn, cmd, hdr);
1511 if (rc < 0)
1512 return rc;
1513 else if (rc > 0)
1514 data_crc_failed = true;
1515
1516 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1517 }
1518
1519 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1520 struct iscsi_nopout *hdr)
1521 {
1522 u32 payload_length = ntoh24(hdr->dlength);
1523
1524 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1525 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1526 if (!cmd)
1527 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1528 (unsigned char *)hdr);
1529
1530 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1531 (unsigned char *)hdr);
1532 }
1533
1534 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1535 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1536 " not set, protocol error.\n");
1537 if (!cmd)
1538 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1539 (unsigned char *)hdr);
1540
1541 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1542 (unsigned char *)hdr);
1543 }
1544
1545 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1546 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1547 " greater than MaxXmitDataSegmentLength: %u, protocol"
1548 " error.\n", payload_length,
1549 conn->conn_ops->MaxXmitDataSegmentLength);
1550 if (!cmd)
1551 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1552 (unsigned char *)hdr);
1553
1554 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1555 (unsigned char *)hdr);
1556 }
1557
1558 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1559 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1560 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1561 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1562 payload_length);
1563 /*
1564 * This is not a response to a Unsolicited NopIN, which means
1565 * it can either be a NOPOUT ping request (with a valid ITT),
1566 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1567 * Either way, make sure we allocate an struct iscsi_cmd, as both
1568 * can contain ping data.
1569 */
1570 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1571 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1572 cmd->i_state = ISTATE_SEND_NOPIN;
1573 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1574 1 : 0);
1575 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1576 cmd->targ_xfer_tag = 0xFFFFFFFF;
1577 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1578 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1579 cmd->data_direction = DMA_NONE;
1580 }
1581
1582 return 0;
1583 }
1584 EXPORT_SYMBOL(iscsit_setup_nop_out);
1585
1586 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1587 struct iscsi_nopout *hdr)
1588 {
1589 struct iscsi_cmd *cmd_p = NULL;
1590 int cmdsn_ret = 0;
1591 /*
1592 * Initiator is expecting a NopIN ping reply..
1593 */
1594 if (hdr->itt != RESERVED_ITT) {
1595 if (!cmd)
1596 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1597 (unsigned char *)hdr);
1598
1599 spin_lock_bh(&conn->cmd_lock);
1600 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1601 spin_unlock_bh(&conn->cmd_lock);
1602
1603 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1604
1605 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1606 iscsit_add_cmd_to_response_queue(cmd, conn,
1607 cmd->i_state);
1608 return 0;
1609 }
1610
1611 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1612 (unsigned char *)hdr, hdr->cmdsn);
1613 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1614 return 0;
1615 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1616 return -1;
1617
1618 return 0;
1619 }
1620 /*
1621 * This was a response to a unsolicited NOPIN ping.
1622 */
1623 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1624 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1625 if (!cmd_p)
1626 return -EINVAL;
1627
1628 iscsit_stop_nopin_response_timer(conn);
1629
1630 cmd_p->i_state = ISTATE_REMOVE;
1631 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1632
1633 iscsit_start_nopin_timer(conn);
1634 return 0;
1635 }
1636 /*
1637 * Otherwise, initiator is not expecting a NOPIN is response.
1638 * Just ignore for now.
1639 */
1640 return 0;
1641 }
1642 EXPORT_SYMBOL(iscsit_process_nop_out);
1643
1644 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1645 unsigned char *buf)
1646 {
1647 unsigned char *ping_data = NULL;
1648 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1649 struct kvec *iov = NULL;
1650 u32 payload_length = ntoh24(hdr->dlength);
1651 int ret;
1652
1653 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1654 if (ret < 0)
1655 return 0;
1656 /*
1657 * Handle NOP-OUT payload for traditional iSCSI sockets
1658 */
1659 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1660 u32 checksum, data_crc, padding = 0;
1661 int niov = 0, rx_got, rx_size = payload_length;
1662
1663 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1664 if (!ping_data) {
1665 pr_err("Unable to allocate memory for"
1666 " NOPOUT ping data.\n");
1667 ret = -1;
1668 goto out;
1669 }
1670
1671 iov = &cmd->iov_misc[0];
1672 iov[niov].iov_base = ping_data;
1673 iov[niov++].iov_len = payload_length;
1674
1675 padding = ((-payload_length) & 3);
1676 if (padding != 0) {
1677 pr_debug("Receiving %u additional bytes"
1678 " for padding.\n", padding);
1679 iov[niov].iov_base = &cmd->pad_bytes;
1680 iov[niov++].iov_len = padding;
1681 rx_size += padding;
1682 }
1683 if (conn->conn_ops->DataDigest) {
1684 iov[niov].iov_base = &checksum;
1685 iov[niov++].iov_len = ISCSI_CRC_LEN;
1686 rx_size += ISCSI_CRC_LEN;
1687 }
1688
1689 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1690 if (rx_got != rx_size) {
1691 ret = -1;
1692 goto out;
1693 }
1694
1695 if (conn->conn_ops->DataDigest) {
1696 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1697 ping_data, payload_length,
1698 padding, cmd->pad_bytes,
1699 (u8 *)&data_crc);
1700
1701 if (checksum != data_crc) {
1702 pr_err("Ping data CRC32C DataDigest"
1703 " 0x%08x does not match computed 0x%08x\n",
1704 checksum, data_crc);
1705 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1706 pr_err("Unable to recover from"
1707 " NOPOUT Ping DataCRC failure while in"
1708 " ERL=0.\n");
1709 ret = -1;
1710 goto out;
1711 } else {
1712 /*
1713 * Silently drop this PDU and let the
1714 * initiator plug the CmdSN gap.
1715 */
1716 pr_debug("Dropping NOPOUT"
1717 " Command CmdSN: 0x%08x due to"
1718 " DataCRC error.\n", hdr->cmdsn);
1719 ret = 0;
1720 goto out;
1721 }
1722 } else {
1723 pr_debug("Got CRC32C DataDigest"
1724 " 0x%08x for %u bytes of ping data.\n",
1725 checksum, payload_length);
1726 }
1727 }
1728
1729 ping_data[payload_length] = '\0';
1730 /*
1731 * Attach ping data to struct iscsi_cmd->buf_ptr.
1732 */
1733 cmd->buf_ptr = ping_data;
1734 cmd->buf_ptr_size = payload_length;
1735
1736 pr_debug("Got %u bytes of NOPOUT ping"
1737 " data.\n", payload_length);
1738 pr_debug("Ping Data: \"%s\"\n", ping_data);
1739 }
1740
1741 return iscsit_process_nop_out(conn, cmd, hdr);
1742 out:
1743 if (cmd)
1744 iscsit_free_cmd(cmd, false);
1745
1746 kfree(ping_data);
1747 return ret;
1748 }
1749
1750 int
1751 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1752 unsigned char *buf)
1753 {
1754 struct se_tmr_req *se_tmr;
1755 struct iscsi_tmr_req *tmr_req;
1756 struct iscsi_tm *hdr;
1757 int out_of_order_cmdsn = 0, ret;
1758 bool sess_ref = false;
1759 u8 function;
1760
1761 hdr = (struct iscsi_tm *) buf;
1762 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1763 function = hdr->flags;
1764
1765 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1766 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1767 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1768 hdr->rtt, hdr->refcmdsn, conn->cid);
1769
1770 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1771 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1772 hdr->rtt != RESERVED_ITT)) {
1773 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1774 hdr->rtt = RESERVED_ITT;
1775 }
1776
1777 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1778 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1779 pr_err("Task Management Request TASK_REASSIGN not"
1780 " issued as immediate command, bad iSCSI Initiator"
1781 "implementation\n");
1782 return iscsit_add_reject_cmd(cmd,
1783 ISCSI_REASON_PROTOCOL_ERROR, buf);
1784 }
1785 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1786 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1787 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1788
1789 cmd->data_direction = DMA_NONE;
1790
1791 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1792 if (!cmd->tmr_req) {
1793 pr_err("Unable to allocate memory for"
1794 " Task Management command!\n");
1795 return iscsit_add_reject_cmd(cmd,
1796 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1797 buf);
1798 }
1799
1800 /*
1801 * TASK_REASSIGN for ERL=2 / connection stays inside of
1802 * LIO-Target $FABRIC_MOD
1803 */
1804 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1805
1806 u8 tcm_function;
1807 int ret;
1808
1809 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1810 conn->sess->se_sess, 0, DMA_NONE,
1811 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1812
1813 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1814 sess_ref = true;
1815
1816 switch (function) {
1817 case ISCSI_TM_FUNC_ABORT_TASK:
1818 tcm_function = TMR_ABORT_TASK;
1819 break;
1820 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1821 tcm_function = TMR_ABORT_TASK_SET;
1822 break;
1823 case ISCSI_TM_FUNC_CLEAR_ACA:
1824 tcm_function = TMR_CLEAR_ACA;
1825 break;
1826 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1827 tcm_function = TMR_CLEAR_TASK_SET;
1828 break;
1829 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1830 tcm_function = TMR_LUN_RESET;
1831 break;
1832 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1833 tcm_function = TMR_TARGET_WARM_RESET;
1834 break;
1835 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1836 tcm_function = TMR_TARGET_COLD_RESET;
1837 break;
1838 default:
1839 pr_err("Unknown iSCSI TMR Function:"
1840 " 0x%02x\n", function);
1841 return iscsit_add_reject_cmd(cmd,
1842 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1843 }
1844
1845 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1846 tcm_function, GFP_KERNEL);
1847 if (ret < 0)
1848 return iscsit_add_reject_cmd(cmd,
1849 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1850
1851 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1852 }
1853
1854 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1855 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1856 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1857 cmd->init_task_tag = hdr->itt;
1858 cmd->targ_xfer_tag = 0xFFFFFFFF;
1859 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1860 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1861 se_tmr = cmd->se_cmd.se_tmr_req;
1862 tmr_req = cmd->tmr_req;
1863 /*
1864 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1865 */
1866 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1867 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1868 scsilun_to_int(&hdr->lun));
1869 if (ret < 0) {
1870 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1871 goto attach;
1872 }
1873 }
1874
1875 switch (function) {
1876 case ISCSI_TM_FUNC_ABORT_TASK:
1877 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1878 if (se_tmr->response)
1879 goto attach;
1880 break;
1881 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1882 case ISCSI_TM_FUNC_CLEAR_ACA:
1883 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1884 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1885 break;
1886 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1887 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1888 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1889 goto attach;
1890 }
1891 break;
1892 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1893 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1894 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1895 goto attach;
1896 }
1897 break;
1898 case ISCSI_TM_FUNC_TASK_REASSIGN:
1899 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1900 /*
1901 * Perform sanity checks on the ExpDataSN only if the
1902 * TASK_REASSIGN was successful.
1903 */
1904 if (se_tmr->response)
1905 break;
1906
1907 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1908 return iscsit_add_reject_cmd(cmd,
1909 ISCSI_REASON_BOOKMARK_INVALID, buf);
1910 break;
1911 default:
1912 pr_err("Unknown TMR function: 0x%02x, protocol"
1913 " error.\n", function);
1914 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1915 goto attach;
1916 }
1917
1918 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1919 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1920 se_tmr->call_transport = 1;
1921 attach:
1922 spin_lock_bh(&conn->cmd_lock);
1923 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1924 spin_unlock_bh(&conn->cmd_lock);
1925
1926 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1927 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1928 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1929 out_of_order_cmdsn = 1;
1930 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1931 return 0;
1932 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1933 return -1;
1934 }
1935 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1936
1937 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1938 return 0;
1939 /*
1940 * Found the referenced task, send to transport for processing.
1941 */
1942 if (se_tmr->call_transport)
1943 return transport_generic_handle_tmr(&cmd->se_cmd);
1944
1945 /*
1946 * Could not find the referenced LUN, task, or Task Management
1947 * command not authorized or supported. Change state and
1948 * let the tx_thread send the response.
1949 *
1950 * For connection recovery, this is also the default action for
1951 * TMR TASK_REASSIGN.
1952 */
1953 if (sess_ref) {
1954 pr_debug("Handle TMR, using sess_ref=true check\n");
1955 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1956 }
1957
1958 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1959 return 0;
1960 }
1961 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1962
1963 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1964 int
1965 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1966 struct iscsi_text *hdr)
1967 {
1968 u32 payload_length = ntoh24(hdr->dlength);
1969
1970 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1971 pr_err("Unable to accept text parameter length: %u"
1972 "greater than MaxXmitDataSegmentLength %u.\n",
1973 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1974 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1975 (unsigned char *)hdr);
1976 }
1977
1978 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1979 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1980 pr_err("Multi sequence text commands currently not supported\n");
1981 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1982 (unsigned char *)hdr);
1983 }
1984
1985 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1986 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1987 hdr->exp_statsn, payload_length);
1988
1989 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1990 cmd->i_state = ISTATE_SEND_TEXTRSP;
1991 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1992 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1993 cmd->targ_xfer_tag = 0xFFFFFFFF;
1994 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1995 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1996 cmd->data_direction = DMA_NONE;
1997 cmd->text_in_ptr = NULL;
1998
1999 return 0;
2000 }
2001 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2002
2003 int
2004 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2005 struct iscsi_text *hdr)
2006 {
2007 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2008 int cmdsn_ret;
2009
2010 if (!text_in) {
2011 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2012 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2013 pr_err("Unable to locate text_in buffer for sendtargets"
2014 " discovery\n");
2015 goto reject;
2016 }
2017 goto empty_sendtargets;
2018 }
2019 if (strncmp("SendTargets", text_in, 11) != 0) {
2020 pr_err("Received Text Data that is not"
2021 " SendTargets, cannot continue.\n");
2022 goto reject;
2023 }
2024 text_ptr = strchr(text_in, '=');
2025 if (!text_ptr) {
2026 pr_err("No \"=\" separator found in Text Data,"
2027 " cannot continue.\n");
2028 goto reject;
2029 }
2030 if (!strncmp("=All", text_ptr, 4)) {
2031 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2032 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2033 !strncmp("=eui.", text_ptr, 5)) {
2034 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2035 } else {
2036 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2037 goto reject;
2038 }
2039
2040 spin_lock_bh(&conn->cmd_lock);
2041 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2042 spin_unlock_bh(&conn->cmd_lock);
2043
2044 empty_sendtargets:
2045 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2046
2047 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2048 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2049 (unsigned char *)hdr, hdr->cmdsn);
2050 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2051 return -1;
2052
2053 return 0;
2054 }
2055
2056 return iscsit_execute_cmd(cmd, 0);
2057
2058 reject:
2059 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2060 (unsigned char *)hdr);
2061 }
2062 EXPORT_SYMBOL(iscsit_process_text_cmd);
2063
2064 static int
2065 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2066 unsigned char *buf)
2067 {
2068 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2069 char *text_in = NULL;
2070 u32 payload_length = ntoh24(hdr->dlength);
2071 int rx_size, rc;
2072
2073 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2074 if (rc < 0)
2075 return 0;
2076
2077 rx_size = payload_length;
2078 if (payload_length) {
2079 u32 checksum = 0, data_crc = 0;
2080 u32 padding = 0, pad_bytes = 0;
2081 int niov = 0, rx_got;
2082 struct kvec iov[3];
2083
2084 text_in = kzalloc(payload_length, GFP_KERNEL);
2085 if (!text_in) {
2086 pr_err("Unable to allocate memory for"
2087 " incoming text parameters\n");
2088 goto reject;
2089 }
2090 cmd->text_in_ptr = text_in;
2091
2092 memset(iov, 0, 3 * sizeof(struct kvec));
2093 iov[niov].iov_base = text_in;
2094 iov[niov++].iov_len = payload_length;
2095
2096 padding = ((-payload_length) & 3);
2097 if (padding != 0) {
2098 iov[niov].iov_base = &pad_bytes;
2099 iov[niov++].iov_len = padding;
2100 rx_size += padding;
2101 pr_debug("Receiving %u additional bytes"
2102 " for padding.\n", padding);
2103 }
2104 if (conn->conn_ops->DataDigest) {
2105 iov[niov].iov_base = &checksum;
2106 iov[niov++].iov_len = ISCSI_CRC_LEN;
2107 rx_size += ISCSI_CRC_LEN;
2108 }
2109
2110 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2111 if (rx_got != rx_size)
2112 goto reject;
2113
2114 if (conn->conn_ops->DataDigest) {
2115 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2116 text_in, payload_length,
2117 padding, (u8 *)&pad_bytes,
2118 (u8 *)&data_crc);
2119
2120 if (checksum != data_crc) {
2121 pr_err("Text data CRC32C DataDigest"
2122 " 0x%08x does not match computed"
2123 " 0x%08x\n", checksum, data_crc);
2124 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2125 pr_err("Unable to recover from"
2126 " Text Data digest failure while in"
2127 " ERL=0.\n");
2128 goto reject;
2129 } else {
2130 /*
2131 * Silently drop this PDU and let the
2132 * initiator plug the CmdSN gap.
2133 */
2134 pr_debug("Dropping Text"
2135 " Command CmdSN: 0x%08x due to"
2136 " DataCRC error.\n", hdr->cmdsn);
2137 kfree(text_in);
2138 return 0;
2139 }
2140 } else {
2141 pr_debug("Got CRC32C DataDigest"
2142 " 0x%08x for %u bytes of text data.\n",
2143 checksum, payload_length);
2144 }
2145 }
2146 text_in[payload_length - 1] = '\0';
2147 pr_debug("Successfully read %d bytes of text"
2148 " data.\n", payload_length);
2149 }
2150
2151 return iscsit_process_text_cmd(conn, cmd, hdr);
2152
2153 reject:
2154 kfree(cmd->text_in_ptr);
2155 cmd->text_in_ptr = NULL;
2156 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2157 }
2158
2159 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2160 {
2161 struct iscsi_conn *conn_p;
2162 struct iscsi_session *sess = conn->sess;
2163
2164 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2165 " for SID: %u.\n", conn->cid, conn->sess->sid);
2166
2167 atomic_set(&sess->session_logout, 1);
2168 atomic_set(&conn->conn_logout_remove, 1);
2169 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2170
2171 iscsit_inc_conn_usage_count(conn);
2172 iscsit_inc_session_usage_count(sess);
2173
2174 spin_lock_bh(&sess->conn_lock);
2175 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2176 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2177 continue;
2178
2179 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2180 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2181 }
2182 spin_unlock_bh(&sess->conn_lock);
2183
2184 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2185
2186 return 0;
2187 }
2188
2189 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2190 {
2191 struct iscsi_conn *l_conn;
2192 struct iscsi_session *sess = conn->sess;
2193
2194 pr_debug("Received logout request CLOSECONNECTION for CID:"
2195 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2196
2197 /*
2198 * A Logout Request with a CLOSECONNECTION reason code for a CID
2199 * can arrive on a connection with a differing CID.
2200 */
2201 if (conn->cid == cmd->logout_cid) {
2202 spin_lock_bh(&conn->state_lock);
2203 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2204 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2205
2206 atomic_set(&conn->conn_logout_remove, 1);
2207 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2208 iscsit_inc_conn_usage_count(conn);
2209
2210 spin_unlock_bh(&conn->state_lock);
2211 } else {
2212 /*
2213 * Handle all different cid CLOSECONNECTION requests in
2214 * iscsit_logout_post_handler_diffcid() as to give enough
2215 * time for any non immediate command's CmdSN to be
2216 * acknowledged on the connection in question.
2217 *
2218 * Here we simply make sure the CID is still around.
2219 */
2220 l_conn = iscsit_get_conn_from_cid(sess,
2221 cmd->logout_cid);
2222 if (!l_conn) {
2223 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2224 iscsit_add_cmd_to_response_queue(cmd, conn,
2225 cmd->i_state);
2226 return 0;
2227 }
2228
2229 iscsit_dec_conn_usage_count(l_conn);
2230 }
2231
2232 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2233
2234 return 0;
2235 }
2236
2237 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2238 {
2239 struct iscsi_session *sess = conn->sess;
2240
2241 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2242 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2243
2244 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2245 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2246 " while ERL!=2.\n");
2247 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2248 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2249 return 0;
2250 }
2251
2252 if (conn->cid == cmd->logout_cid) {
2253 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2254 " with CID: %hu on CID: %hu, implementation error.\n",
2255 cmd->logout_cid, conn->cid);
2256 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2257 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2258 return 0;
2259 }
2260
2261 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2262
2263 return 0;
2264 }
2265
2266 int
2267 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2268 unsigned char *buf)
2269 {
2270 int cmdsn_ret, logout_remove = 0;
2271 u8 reason_code = 0;
2272 struct iscsi_logout *hdr;
2273 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2274
2275 hdr = (struct iscsi_logout *) buf;
2276 reason_code = (hdr->flags & 0x7f);
2277
2278 if (tiqn) {
2279 spin_lock(&tiqn->logout_stats.lock);
2280 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2281 tiqn->logout_stats.normal_logouts++;
2282 else
2283 tiqn->logout_stats.abnormal_logouts++;
2284 spin_unlock(&tiqn->logout_stats.lock);
2285 }
2286
2287 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2288 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2289 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2290 hdr->cid, conn->cid);
2291
2292 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2293 pr_err("Received logout request on connection that"
2294 " is not in logged in state, ignoring request.\n");
2295 iscsit_free_cmd(cmd, false);
2296 return 0;
2297 }
2298
2299 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2300 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2301 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2302 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2303 cmd->targ_xfer_tag = 0xFFFFFFFF;
2304 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2305 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2306 cmd->logout_cid = be16_to_cpu(hdr->cid);
2307 cmd->logout_reason = reason_code;
2308 cmd->data_direction = DMA_NONE;
2309
2310 /*
2311 * We need to sleep in these cases (by returning 1) until the Logout
2312 * Response gets sent in the tx thread.
2313 */
2314 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2315 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2316 be16_to_cpu(hdr->cid) == conn->cid))
2317 logout_remove = 1;
2318
2319 spin_lock_bh(&conn->cmd_lock);
2320 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2321 spin_unlock_bh(&conn->cmd_lock);
2322
2323 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2324 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2325
2326 /*
2327 * Immediate commands are executed, well, immediately.
2328 * Non-Immediate Logout Commands are executed in CmdSN order.
2329 */
2330 if (cmd->immediate_cmd) {
2331 int ret = iscsit_execute_cmd(cmd, 0);
2332
2333 if (ret < 0)
2334 return ret;
2335 } else {
2336 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2337 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2338 logout_remove = 0;
2339 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2340 return -1;
2341 }
2342
2343 return logout_remove;
2344 }
2345 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2346
2347 static int iscsit_handle_snack(
2348 struct iscsi_conn *conn,
2349 unsigned char *buf)
2350 {
2351 struct iscsi_snack *hdr;
2352
2353 hdr = (struct iscsi_snack *) buf;
2354 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2355
2356 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2357 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2358 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2359 hdr->begrun, hdr->runlength, conn->cid);
2360
2361 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2362 pr_err("Initiator sent SNACK request while in"
2363 " ErrorRecoveryLevel=0.\n");
2364 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2365 buf);
2366 }
2367 /*
2368 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2369 * call from inside iscsi_send_recovery_datain_or_r2t().
2370 */
2371 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2372 case 0:
2373 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2374 hdr->itt,
2375 be32_to_cpu(hdr->ttt),
2376 be32_to_cpu(hdr->begrun),
2377 be32_to_cpu(hdr->runlength));
2378 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2379 return iscsit_handle_status_snack(conn, hdr->itt,
2380 be32_to_cpu(hdr->ttt),
2381 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2382 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2383 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2384 be32_to_cpu(hdr->begrun),
2385 be32_to_cpu(hdr->runlength));
2386 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2387 /* FIXME: Support R-Data SNACK */
2388 pr_err("R-Data SNACK Not Supported.\n");
2389 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2390 buf);
2391 default:
2392 pr_err("Unknown SNACK type 0x%02x, protocol"
2393 " error.\n", hdr->flags & 0x0f);
2394 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2395 buf);
2396 }
2397
2398 return 0;
2399 }
2400
2401 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2402 {
2403 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2404 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2405 wait_for_completion_interruptible_timeout(
2406 &conn->rx_half_close_comp,
2407 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2408 }
2409 }
2410
2411 static int iscsit_handle_immediate_data(
2412 struct iscsi_cmd *cmd,
2413 struct iscsi_scsi_req *hdr,
2414 u32 length)
2415 {
2416 int iov_ret, rx_got = 0, rx_size = 0;
2417 u32 checksum, iov_count = 0, padding = 0;
2418 struct iscsi_conn *conn = cmd->conn;
2419 struct kvec *iov;
2420
2421 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2422 if (iov_ret < 0)
2423 return IMMEDIATE_DATA_CANNOT_RECOVER;
2424
2425 rx_size = length;
2426 iov_count = iov_ret;
2427 iov = &cmd->iov_data[0];
2428
2429 padding = ((-length) & 3);
2430 if (padding != 0) {
2431 iov[iov_count].iov_base = cmd->pad_bytes;
2432 iov[iov_count++].iov_len = padding;
2433 rx_size += padding;
2434 }
2435
2436 if (conn->conn_ops->DataDigest) {
2437 iov[iov_count].iov_base = &checksum;
2438 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2439 rx_size += ISCSI_CRC_LEN;
2440 }
2441
2442 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2443
2444 iscsit_unmap_iovec(cmd);
2445
2446 if (rx_got != rx_size) {
2447 iscsit_rx_thread_wait_for_tcp(conn);
2448 return IMMEDIATE_DATA_CANNOT_RECOVER;
2449 }
2450
2451 if (conn->conn_ops->DataDigest) {
2452 u32 data_crc;
2453
2454 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2455 cmd->write_data_done, length, padding,
2456 cmd->pad_bytes);
2457
2458 if (checksum != data_crc) {
2459 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2460 " does not match computed 0x%08x\n", checksum,
2461 data_crc);
2462
2463 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2464 pr_err("Unable to recover from"
2465 " Immediate Data digest failure while"
2466 " in ERL=0.\n");
2467 iscsit_reject_cmd(cmd,
2468 ISCSI_REASON_DATA_DIGEST_ERROR,
2469 (unsigned char *)hdr);
2470 return IMMEDIATE_DATA_CANNOT_RECOVER;
2471 } else {
2472 iscsit_reject_cmd(cmd,
2473 ISCSI_REASON_DATA_DIGEST_ERROR,
2474 (unsigned char *)hdr);
2475 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2476 }
2477 } else {
2478 pr_debug("Got CRC32C DataDigest 0x%08x for"
2479 " %u bytes of Immediate Data\n", checksum,
2480 length);
2481 }
2482 }
2483
2484 cmd->write_data_done += length;
2485
2486 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2487 spin_lock_bh(&cmd->istate_lock);
2488 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2489 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2490 spin_unlock_bh(&cmd->istate_lock);
2491 }
2492
2493 return IMMEDIATE_DATA_NORMAL_OPERATION;
2494 }
2495
2496 /*
2497 * Called with sess->conn_lock held.
2498 */
2499 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2500 with active network interface */
2501 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2502 {
2503 struct iscsi_cmd *cmd;
2504 struct iscsi_conn *conn_p;
2505 bool found = false;
2506
2507 /*
2508 * Only send a Asynchronous Message on connections whos network
2509 * interface is still functional.
2510 */
2511 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2512 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2513 iscsit_inc_conn_usage_count(conn_p);
2514 found = true;
2515 break;
2516 }
2517 }
2518
2519 if (!found)
2520 return;
2521
2522 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2523 if (!cmd) {
2524 iscsit_dec_conn_usage_count(conn_p);
2525 return;
2526 }
2527
2528 cmd->logout_cid = conn->cid;
2529 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2530 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2531
2532 spin_lock_bh(&conn_p->cmd_lock);
2533 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2534 spin_unlock_bh(&conn_p->cmd_lock);
2535
2536 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2537 iscsit_dec_conn_usage_count(conn_p);
2538 }
2539
2540 static int iscsit_send_conn_drop_async_message(
2541 struct iscsi_cmd *cmd,
2542 struct iscsi_conn *conn)
2543 {
2544 struct iscsi_async *hdr;
2545
2546 cmd->tx_size = ISCSI_HDR_LEN;
2547 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2548
2549 hdr = (struct iscsi_async *) cmd->pdu;
2550 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2551 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2552 cmd->init_task_tag = RESERVED_ITT;
2553 cmd->targ_xfer_tag = 0xFFFFFFFF;
2554 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2555 cmd->stat_sn = conn->stat_sn++;
2556 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2557 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2558 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2559 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2560 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2561 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2562 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2563
2564 if (conn->conn_ops->HeaderDigest) {
2565 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2566
2567 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2568 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2569
2570 cmd->tx_size += ISCSI_CRC_LEN;
2571 pr_debug("Attaching CRC32C HeaderDigest to"
2572 " Async Message 0x%08x\n", *header_digest);
2573 }
2574
2575 cmd->iov_misc[0].iov_base = cmd->pdu;
2576 cmd->iov_misc[0].iov_len = cmd->tx_size;
2577 cmd->iov_misc_count = 1;
2578
2579 pr_debug("Sending Connection Dropped Async Message StatSN:"
2580 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2581 cmd->logout_cid, conn->cid);
2582 return 0;
2583 }
2584
2585 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2586 {
2587 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2588 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2589 wait_for_completion_interruptible_timeout(
2590 &conn->tx_half_close_comp,
2591 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2592 }
2593 }
2594
2595 static void
2596 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2597 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2598 bool set_statsn)
2599 {
2600 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2601 hdr->flags = datain->flags;
2602 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2603 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2604 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2605 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2606 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2607 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2608 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2609 }
2610 }
2611 hton24(hdr->dlength, datain->length);
2612 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2613 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2614 (struct scsi_lun *)&hdr->lun);
2615 else
2616 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2617
2618 hdr->itt = cmd->init_task_tag;
2619
2620 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2621 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2622 else
2623 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2624 if (set_statsn)
2625 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2626 else
2627 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2628
2629 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2630 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2631 hdr->datasn = cpu_to_be32(datain->data_sn);
2632 hdr->offset = cpu_to_be32(datain->offset);
2633
2634 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2635 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2636 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2637 ntohl(hdr->offset), datain->length, conn->cid);
2638 }
2639
2640 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2641 {
2642 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2643 struct iscsi_datain datain;
2644 struct iscsi_datain_req *dr;
2645 struct kvec *iov;
2646 u32 iov_count = 0, tx_size = 0;
2647 int eodr = 0, ret, iov_ret;
2648 bool set_statsn = false;
2649
2650 memset(&datain, 0, sizeof(struct iscsi_datain));
2651 dr = iscsit_get_datain_values(cmd, &datain);
2652 if (!dr) {
2653 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2654 cmd->init_task_tag);
2655 return -1;
2656 }
2657 /*
2658 * Be paranoid and double check the logic for now.
2659 */
2660 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2661 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2662 " datain.length: %u exceeds cmd->data_length: %u\n",
2663 cmd->init_task_tag, datain.offset, datain.length,
2664 cmd->se_cmd.data_length);
2665 return -1;
2666 }
2667
2668 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2669 /*
2670 * Special case for successfully execution w/ both DATAIN
2671 * and Sense Data.
2672 */
2673 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2674 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2675 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2676 else {
2677 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2678 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2679 iscsit_increment_maxcmdsn(cmd, conn->sess);
2680 cmd->stat_sn = conn->stat_sn++;
2681 set_statsn = true;
2682 } else if (dr->dr_complete ==
2683 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2684 set_statsn = true;
2685 }
2686
2687 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2688
2689 iov = &cmd->iov_data[0];
2690 iov[iov_count].iov_base = cmd->pdu;
2691 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2692 tx_size += ISCSI_HDR_LEN;
2693
2694 if (conn->conn_ops->HeaderDigest) {
2695 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2696
2697 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2698 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2699
2700 iov[0].iov_len += ISCSI_CRC_LEN;
2701 tx_size += ISCSI_CRC_LEN;
2702
2703 pr_debug("Attaching CRC32 HeaderDigest"
2704 " for DataIN PDU 0x%08x\n", *header_digest);
2705 }
2706
2707 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2708 datain.offset, datain.length);
2709 if (iov_ret < 0)
2710 return -1;
2711
2712 iov_count += iov_ret;
2713 tx_size += datain.length;
2714
2715 cmd->padding = ((-datain.length) & 3);
2716 if (cmd->padding) {
2717 iov[iov_count].iov_base = cmd->pad_bytes;
2718 iov[iov_count++].iov_len = cmd->padding;
2719 tx_size += cmd->padding;
2720
2721 pr_debug("Attaching %u padding bytes\n",
2722 cmd->padding);
2723 }
2724 if (conn->conn_ops->DataDigest) {
2725 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2726 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2727
2728 iov[iov_count].iov_base = &cmd->data_crc;
2729 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2730 tx_size += ISCSI_CRC_LEN;
2731
2732 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2733 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2734 }
2735
2736 cmd->iov_data_count = iov_count;
2737 cmd->tx_size = tx_size;
2738
2739 /* sendpage is preferred but can't insert markers */
2740 if (!conn->conn_ops->IFMarker)
2741 ret = iscsit_fe_sendpage_sg(cmd, conn);
2742 else
2743 ret = iscsit_send_tx_data(cmd, conn, 0);
2744
2745 iscsit_unmap_iovec(cmd);
2746
2747 if (ret < 0) {
2748 iscsit_tx_thread_wait_for_tcp(conn);
2749 return ret;
2750 }
2751
2752 if (dr->dr_complete) {
2753 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2754 2 : 1;
2755 iscsit_free_datain_req(cmd, dr);
2756 }
2757
2758 return eodr;
2759 }
2760
2761 int
2762 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2763 struct iscsi_logout_rsp *hdr)
2764 {
2765 struct iscsi_conn *logout_conn = NULL;
2766 struct iscsi_conn_recovery *cr = NULL;
2767 struct iscsi_session *sess = conn->sess;
2768 /*
2769 * The actual shutting down of Sessions and/or Connections
2770 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2771 * is done in scsi_logout_post_handler().
2772 */
2773 switch (cmd->logout_reason) {
2774 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2775 pr_debug("iSCSI session logout successful, setting"
2776 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2777 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2778 break;
2779 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2780 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2781 break;
2782 /*
2783 * For CLOSECONNECTION logout requests carrying
2784 * a matching logout CID -> local CID, the reference
2785 * for the local CID will have been incremented in
2786 * iscsi_logout_closeconnection().
2787 *
2788 * For CLOSECONNECTION logout requests carrying
2789 * a different CID than the connection it arrived
2790 * on, the connection responding to cmd->logout_cid
2791 * is stopped in iscsit_logout_post_handler_diffcid().
2792 */
2793
2794 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2795 " successful.\n", cmd->logout_cid, conn->cid);
2796 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2797 break;
2798 case ISCSI_LOGOUT_REASON_RECOVERY:
2799 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2800 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2801 break;
2802 /*
2803 * If the connection is still active from our point of view
2804 * force connection recovery to occur.
2805 */
2806 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2807 cmd->logout_cid);
2808 if (logout_conn) {
2809 iscsit_connection_reinstatement_rcfr(logout_conn);
2810 iscsit_dec_conn_usage_count(logout_conn);
2811 }
2812
2813 cr = iscsit_get_inactive_connection_recovery_entry(
2814 conn->sess, cmd->logout_cid);
2815 if (!cr) {
2816 pr_err("Unable to locate CID: %hu for"
2817 " REMOVECONNFORRECOVERY Logout Request.\n",
2818 cmd->logout_cid);
2819 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2820 break;
2821 }
2822
2823 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2824
2825 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2826 " for recovery for CID: %hu on CID: %hu successful.\n",
2827 cmd->logout_cid, conn->cid);
2828 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2829 break;
2830 default:
2831 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2832 cmd->logout_reason);
2833 return -1;
2834 }
2835
2836 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2837 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2838 hdr->response = cmd->logout_response;
2839 hdr->itt = cmd->init_task_tag;
2840 cmd->stat_sn = conn->stat_sn++;
2841 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2842
2843 iscsit_increment_maxcmdsn(cmd, conn->sess);
2844 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2845 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2846
2847 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2848 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2849 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2850 cmd->logout_cid, conn->cid);
2851
2852 return 0;
2853 }
2854 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2855
2856 static int
2857 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2858 {
2859 struct kvec *iov;
2860 int niov = 0, tx_size, rc;
2861
2862 rc = iscsit_build_logout_rsp(cmd, conn,
2863 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2864 if (rc < 0)
2865 return rc;
2866
2867 tx_size = ISCSI_HDR_LEN;
2868 iov = &cmd->iov_misc[0];
2869 iov[niov].iov_base = cmd->pdu;
2870 iov[niov++].iov_len = ISCSI_HDR_LEN;
2871
2872 if (conn->conn_ops->HeaderDigest) {
2873 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2874
2875 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2876 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2877
2878 iov[0].iov_len += ISCSI_CRC_LEN;
2879 tx_size += ISCSI_CRC_LEN;
2880 pr_debug("Attaching CRC32C HeaderDigest to"
2881 " Logout Response 0x%08x\n", *header_digest);
2882 }
2883 cmd->iov_misc_count = niov;
2884 cmd->tx_size = tx_size;
2885
2886 return 0;
2887 }
2888
2889 void
2890 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2891 struct iscsi_nopin *hdr, bool nopout_response)
2892 {
2893 hdr->opcode = ISCSI_OP_NOOP_IN;
2894 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2895 hton24(hdr->dlength, cmd->buf_ptr_size);
2896 if (nopout_response)
2897 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2898 hdr->itt = cmd->init_task_tag;
2899 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2900 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2901 conn->stat_sn;
2902 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2903
2904 if (nopout_response)
2905 iscsit_increment_maxcmdsn(cmd, conn->sess);
2906
2907 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2908 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2909
2910 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2911 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2912 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2913 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2914 }
2915 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2916
2917 /*
2918 * Unsolicited NOPIN, either requesting a response or not.
2919 */
2920 static int iscsit_send_unsolicited_nopin(
2921 struct iscsi_cmd *cmd,
2922 struct iscsi_conn *conn,
2923 int want_response)
2924 {
2925 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2926 int tx_size = ISCSI_HDR_LEN, ret;
2927
2928 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2929
2930 if (conn->conn_ops->HeaderDigest) {
2931 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2932
2933 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2934 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2935
2936 tx_size += ISCSI_CRC_LEN;
2937 pr_debug("Attaching CRC32C HeaderDigest to"
2938 " NopIN 0x%08x\n", *header_digest);
2939 }
2940
2941 cmd->iov_misc[0].iov_base = cmd->pdu;
2942 cmd->iov_misc[0].iov_len = tx_size;
2943 cmd->iov_misc_count = 1;
2944 cmd->tx_size = tx_size;
2945
2946 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2947 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2948
2949 ret = iscsit_send_tx_data(cmd, conn, 1);
2950 if (ret < 0) {
2951 iscsit_tx_thread_wait_for_tcp(conn);
2952 return ret;
2953 }
2954
2955 spin_lock_bh(&cmd->istate_lock);
2956 cmd->i_state = want_response ?
2957 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2958 spin_unlock_bh(&cmd->istate_lock);
2959
2960 return 0;
2961 }
2962
2963 static int
2964 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2965 {
2966 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2967 struct kvec *iov;
2968 u32 padding = 0;
2969 int niov = 0, tx_size;
2970
2971 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2972
2973 tx_size = ISCSI_HDR_LEN;
2974 iov = &cmd->iov_misc[0];
2975 iov[niov].iov_base = cmd->pdu;
2976 iov[niov++].iov_len = ISCSI_HDR_LEN;
2977
2978 if (conn->conn_ops->HeaderDigest) {
2979 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2980
2981 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2982 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2983
2984 iov[0].iov_len += ISCSI_CRC_LEN;
2985 tx_size += ISCSI_CRC_LEN;
2986 pr_debug("Attaching CRC32C HeaderDigest"
2987 " to NopIn 0x%08x\n", *header_digest);
2988 }
2989
2990 /*
2991 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2992 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2993 */
2994 if (cmd->buf_ptr_size) {
2995 iov[niov].iov_base = cmd->buf_ptr;
2996 iov[niov++].iov_len = cmd->buf_ptr_size;
2997 tx_size += cmd->buf_ptr_size;
2998
2999 pr_debug("Echoing back %u bytes of ping"
3000 " data.\n", cmd->buf_ptr_size);
3001
3002 padding = ((-cmd->buf_ptr_size) & 3);
3003 if (padding != 0) {
3004 iov[niov].iov_base = &cmd->pad_bytes;
3005 iov[niov++].iov_len = padding;
3006 tx_size += padding;
3007 pr_debug("Attaching %u additional"
3008 " padding bytes.\n", padding);
3009 }
3010 if (conn->conn_ops->DataDigest) {
3011 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3012 cmd->buf_ptr, cmd->buf_ptr_size,
3013 padding, (u8 *)&cmd->pad_bytes,
3014 (u8 *)&cmd->data_crc);
3015
3016 iov[niov].iov_base = &cmd->data_crc;
3017 iov[niov++].iov_len = ISCSI_CRC_LEN;
3018 tx_size += ISCSI_CRC_LEN;
3019 pr_debug("Attached DataDigest for %u"
3020 " bytes of ping data, CRC 0x%08x\n",
3021 cmd->buf_ptr_size, cmd->data_crc);
3022 }
3023 }
3024
3025 cmd->iov_misc_count = niov;
3026 cmd->tx_size = tx_size;
3027
3028 return 0;
3029 }
3030
3031 static int iscsit_send_r2t(
3032 struct iscsi_cmd *cmd,
3033 struct iscsi_conn *conn)
3034 {
3035 int tx_size = 0;
3036 struct iscsi_r2t *r2t;
3037 struct iscsi_r2t_rsp *hdr;
3038 int ret;
3039
3040 r2t = iscsit_get_r2t_from_list(cmd);
3041 if (!r2t)
3042 return -1;
3043
3044 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3045 memset(hdr, 0, ISCSI_HDR_LEN);
3046 hdr->opcode = ISCSI_OP_R2T;
3047 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3048 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3049 (struct scsi_lun *)&hdr->lun);
3050 hdr->itt = cmd->init_task_tag;
3051 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3052 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3053 hdr->statsn = cpu_to_be32(conn->stat_sn);
3054 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3055 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3056 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3057 hdr->data_offset = cpu_to_be32(r2t->offset);
3058 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3059
3060 cmd->iov_misc[0].iov_base = cmd->pdu;
3061 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3062 tx_size += ISCSI_HDR_LEN;
3063
3064 if (conn->conn_ops->HeaderDigest) {
3065 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3066
3067 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3068 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3069
3070 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3071 tx_size += ISCSI_CRC_LEN;
3072 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3073 " PDU 0x%08x\n", *header_digest);
3074 }
3075
3076 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3077 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3078 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3079 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3080 r2t->offset, r2t->xfer_len, conn->cid);
3081
3082 cmd->iov_misc_count = 1;
3083 cmd->tx_size = tx_size;
3084
3085 spin_lock_bh(&cmd->r2t_lock);
3086 r2t->sent_r2t = 1;
3087 spin_unlock_bh(&cmd->r2t_lock);
3088
3089 ret = iscsit_send_tx_data(cmd, conn, 1);
3090 if (ret < 0) {
3091 iscsit_tx_thread_wait_for_tcp(conn);
3092 return ret;
3093 }
3094
3095 spin_lock_bh(&cmd->dataout_timeout_lock);
3096 iscsit_start_dataout_timer(cmd, conn);
3097 spin_unlock_bh(&cmd->dataout_timeout_lock);
3098
3099 return 0;
3100 }
3101
3102 /*
3103 * @recovery: If called from iscsi_task_reassign_complete_write() for
3104 * connection recovery.
3105 */
3106 int iscsit_build_r2ts_for_cmd(
3107 struct iscsi_conn *conn,
3108 struct iscsi_cmd *cmd,
3109 bool recovery)
3110 {
3111 int first_r2t = 1;
3112 u32 offset = 0, xfer_len = 0;
3113
3114 spin_lock_bh(&cmd->r2t_lock);
3115 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3116 spin_unlock_bh(&cmd->r2t_lock);
3117 return 0;
3118 }
3119
3120 if (conn->sess->sess_ops->DataSequenceInOrder &&
3121 !recovery)
3122 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3123
3124 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3125 if (conn->sess->sess_ops->DataSequenceInOrder) {
3126 offset = cmd->r2t_offset;
3127
3128 if (first_r2t && recovery) {
3129 int new_data_end = offset +
3130 conn->sess->sess_ops->MaxBurstLength -
3131 cmd->next_burst_len;
3132
3133 if (new_data_end > cmd->se_cmd.data_length)
3134 xfer_len = cmd->se_cmd.data_length - offset;
3135 else
3136 xfer_len =
3137 conn->sess->sess_ops->MaxBurstLength -
3138 cmd->next_burst_len;
3139 } else {
3140 int new_data_end = offset +
3141 conn->sess->sess_ops->MaxBurstLength;
3142
3143 if (new_data_end > cmd->se_cmd.data_length)
3144 xfer_len = cmd->se_cmd.data_length - offset;
3145 else
3146 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3147 }
3148 cmd->r2t_offset += xfer_len;
3149
3150 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3151 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3152 } else {
3153 struct iscsi_seq *seq;
3154
3155 seq = iscsit_get_seq_holder_for_r2t(cmd);
3156 if (!seq) {
3157 spin_unlock_bh(&cmd->r2t_lock);
3158 return -1;
3159 }
3160
3161 offset = seq->offset;
3162 xfer_len = seq->xfer_len;
3163
3164 if (cmd->seq_send_order == cmd->seq_count)
3165 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3166 }
3167 cmd->outstanding_r2ts++;
3168 first_r2t = 0;
3169
3170 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3171 spin_unlock_bh(&cmd->r2t_lock);
3172 return -1;
3173 }
3174
3175 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3176 break;
3177 }
3178 spin_unlock_bh(&cmd->r2t_lock);
3179
3180 return 0;
3181 }
3182
3183 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3184 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3185 {
3186 if (inc_stat_sn)
3187 cmd->stat_sn = conn->stat_sn++;
3188
3189 atomic_long_inc(&conn->sess->rsp_pdus);
3190
3191 memset(hdr, 0, ISCSI_HDR_LEN);
3192 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3193 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3194 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3195 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3196 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3197 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3198 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3199 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3200 }
3201 hdr->response = cmd->iscsi_response;
3202 hdr->cmd_status = cmd->se_cmd.scsi_status;
3203 hdr->itt = cmd->init_task_tag;
3204 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3205
3206 iscsit_increment_maxcmdsn(cmd, conn->sess);
3207 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3208 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3209
3210 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3211 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3212 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3213 cmd->se_cmd.scsi_status, conn->cid);
3214 }
3215 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3216
3217 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3218 {
3219 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3220 struct kvec *iov;
3221 u32 padding = 0, tx_size = 0;
3222 int iov_count = 0;
3223 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3224
3225 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3226
3227 iov = &cmd->iov_misc[0];
3228 iov[iov_count].iov_base = cmd->pdu;
3229 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3230 tx_size += ISCSI_HDR_LEN;
3231
3232 /*
3233 * Attach SENSE DATA payload to iSCSI Response PDU
3234 */
3235 if (cmd->se_cmd.sense_buffer &&
3236 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3237 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3238 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3239 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3240
3241 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3242 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3243 iov[iov_count].iov_base = cmd->sense_buffer;
3244 iov[iov_count++].iov_len =
3245 (cmd->se_cmd.scsi_sense_length + padding);
3246 tx_size += cmd->se_cmd.scsi_sense_length;
3247
3248 if (padding) {
3249 memset(cmd->sense_buffer +
3250 cmd->se_cmd.scsi_sense_length, 0, padding);
3251 tx_size += padding;
3252 pr_debug("Adding %u bytes of padding to"
3253 " SENSE.\n", padding);
3254 }
3255
3256 if (conn->conn_ops->DataDigest) {
3257 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3258 cmd->sense_buffer,
3259 (cmd->se_cmd.scsi_sense_length + padding),
3260 0, NULL, (u8 *)&cmd->data_crc);
3261
3262 iov[iov_count].iov_base = &cmd->data_crc;
3263 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3264 tx_size += ISCSI_CRC_LEN;
3265
3266 pr_debug("Attaching CRC32 DataDigest for"
3267 " SENSE, %u bytes CRC 0x%08x\n",
3268 (cmd->se_cmd.scsi_sense_length + padding),
3269 cmd->data_crc);
3270 }
3271
3272 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3273 " Response PDU\n",
3274 cmd->se_cmd.scsi_sense_length);
3275 }
3276
3277 if (conn->conn_ops->HeaderDigest) {
3278 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3279
3280 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3281 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3282
3283 iov[0].iov_len += ISCSI_CRC_LEN;
3284 tx_size += ISCSI_CRC_LEN;
3285 pr_debug("Attaching CRC32 HeaderDigest for Response"
3286 " PDU 0x%08x\n", *header_digest);
3287 }
3288
3289 cmd->iov_misc_count = iov_count;
3290 cmd->tx_size = tx_size;
3291
3292 return 0;
3293 }
3294
3295 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3296 {
3297 switch (se_tmr->response) {
3298 case TMR_FUNCTION_COMPLETE:
3299 return ISCSI_TMF_RSP_COMPLETE;
3300 case TMR_TASK_DOES_NOT_EXIST:
3301 return ISCSI_TMF_RSP_NO_TASK;
3302 case TMR_LUN_DOES_NOT_EXIST:
3303 return ISCSI_TMF_RSP_NO_LUN;
3304 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3305 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3306 case TMR_FUNCTION_REJECTED:
3307 default:
3308 return ISCSI_TMF_RSP_REJECTED;
3309 }
3310 }
3311
3312 void
3313 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3314 struct iscsi_tm_rsp *hdr)
3315 {
3316 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3317
3318 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3319 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3320 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3321 hdr->itt = cmd->init_task_tag;
3322 cmd->stat_sn = conn->stat_sn++;
3323 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3324
3325 iscsit_increment_maxcmdsn(cmd, conn->sess);
3326 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3327 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3328
3329 pr_debug("Built Task Management Response ITT: 0x%08x,"
3330 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3331 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3332 }
3333 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3334
3335 static int
3336 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3337 {
3338 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3339 u32 tx_size = 0;
3340
3341 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3342
3343 cmd->iov_misc[0].iov_base = cmd->pdu;
3344 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3345 tx_size += ISCSI_HDR_LEN;
3346
3347 if (conn->conn_ops->HeaderDigest) {
3348 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3349
3350 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3351 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3352
3353 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3354 tx_size += ISCSI_CRC_LEN;
3355 pr_debug("Attaching CRC32 HeaderDigest for Task"
3356 " Mgmt Response PDU 0x%08x\n", *header_digest);
3357 }
3358
3359 cmd->iov_misc_count = 1;
3360 cmd->tx_size = tx_size;
3361
3362 return 0;
3363 }
3364
3365 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3366 {
3367 bool ret = false;
3368
3369 if (np->np_sockaddr.ss_family == AF_INET6) {
3370 const struct sockaddr_in6 sin6 = {
3371 .sin6_addr = IN6ADDR_ANY_INIT };
3372 struct sockaddr_in6 *sock_in6 =
3373 (struct sockaddr_in6 *)&np->np_sockaddr;
3374
3375 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3376 sin6.sin6_addr.s6_addr, 16))
3377 ret = true;
3378 } else {
3379 struct sockaddr_in * sock_in =
3380 (struct sockaddr_in *)&np->np_sockaddr;
3381
3382 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3383 ret = true;
3384 }
3385
3386 return ret;
3387 }
3388
3389 #define SENDTARGETS_BUF_LIMIT 32768U
3390
3391 static int
3392 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3393 enum iscsit_transport_type network_transport,
3394 int skip_bytes, bool *completed)
3395 {
3396 char *payload = NULL;
3397 struct iscsi_conn *conn = cmd->conn;
3398 struct iscsi_portal_group *tpg;
3399 struct iscsi_tiqn *tiqn;
3400 struct iscsi_tpg_np *tpg_np;
3401 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3402 int target_name_printed;
3403 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3404 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3405
3406 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3407 SENDTARGETS_BUF_LIMIT);
3408
3409 payload = kzalloc(buffer_len, GFP_KERNEL);
3410 if (!payload) {
3411 pr_err("Unable to allocate memory for sendtargets"
3412 " response.\n");
3413 return -ENOMEM;
3414 }
3415 /*
3416 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3417 * explicit case..
3418 */
3419 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3420 text_ptr = strchr(text_in, '=');
3421 if (!text_ptr) {
3422 pr_err("Unable to locate '=' string in text_in:"
3423 " %s\n", text_in);
3424 kfree(payload);
3425 return -EINVAL;
3426 }
3427 /*
3428 * Skip over '=' character..
3429 */
3430 text_ptr += 1;
3431 }
3432
3433 spin_lock(&tiqn_lock);
3434 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3435 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3436 strcmp(tiqn->tiqn, text_ptr)) {
3437 continue;
3438 }
3439
3440 target_name_printed = 0;
3441
3442 spin_lock(&tiqn->tiqn_tpg_lock);
3443 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3444
3445 /* If demo_mode_discovery=0 and generate_node_acls=0
3446 * (demo mode dislabed) do not return
3447 * TargetName+TargetAddress unless a NodeACL exists.
3448 */
3449
3450 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3451 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3452 (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3453 cmd->conn->sess->sess_ops->InitiatorName))) {
3454 continue;
3455 }
3456
3457 spin_lock(&tpg->tpg_state_lock);
3458 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3459 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3460 spin_unlock(&tpg->tpg_state_lock);
3461 continue;
3462 }
3463 spin_unlock(&tpg->tpg_state_lock);
3464
3465 spin_lock(&tpg->tpg_np_lock);
3466 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3467 tpg_np_list) {
3468 struct iscsi_np *np = tpg_np->tpg_np;
3469 bool inaddr_any = iscsit_check_inaddr_any(np);
3470 char *fmt_str;
3471
3472 if (np->np_network_transport != network_transport)
3473 continue;
3474
3475 if (!target_name_printed) {
3476 len = sprintf(buf, "TargetName=%s",
3477 tiqn->tiqn);
3478 len += 1;
3479
3480 if ((len + payload_len) > buffer_len) {
3481 spin_unlock(&tpg->tpg_np_lock);
3482 spin_unlock(&tiqn->tiqn_tpg_lock);
3483 end_of_buf = 1;
3484 goto eob;
3485 }
3486
3487 if (skip_bytes && len <= skip_bytes) {
3488 skip_bytes -= len;
3489 } else {
3490 memcpy(payload + payload_len, buf, len);
3491 payload_len += len;
3492 target_name_printed = 1;
3493 if (len > skip_bytes)
3494 skip_bytes = 0;
3495 }
3496 }
3497
3498 if (np->np_sockaddr.ss_family == AF_INET6)
3499 fmt_str = "TargetAddress=[%s]:%hu,%hu";
3500 else
3501 fmt_str = "TargetAddress=%s:%hu,%hu";
3502
3503 len = sprintf(buf, fmt_str,
3504 inaddr_any ? conn->local_ip : np->np_ip,
3505 np->np_port,
3506 tpg->tpgt);
3507 len += 1;
3508
3509 if ((len + payload_len) > buffer_len) {
3510 spin_unlock(&tpg->tpg_np_lock);
3511 spin_unlock(&tiqn->tiqn_tpg_lock);
3512 end_of_buf = 1;
3513 goto eob;
3514 }
3515
3516 if (skip_bytes && len <= skip_bytes) {
3517 skip_bytes -= len;
3518 } else {
3519 memcpy(payload + payload_len, buf, len);
3520 payload_len += len;
3521 if (len > skip_bytes)
3522 skip_bytes = 0;
3523 }
3524 }
3525 spin_unlock(&tpg->tpg_np_lock);
3526 }
3527 spin_unlock(&tiqn->tiqn_tpg_lock);
3528 eob:
3529 if (end_of_buf) {
3530 *completed = false;
3531 break;
3532 }
3533
3534 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3535 break;
3536 }
3537 spin_unlock(&tiqn_lock);
3538
3539 cmd->buf_ptr = payload;
3540
3541 return payload_len;
3542 }
3543
3544 int
3545 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3546 struct iscsi_text_rsp *hdr,
3547 enum iscsit_transport_type network_transport)
3548 {
3549 int text_length, padding;
3550 bool completed = true;
3551
3552 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3553 cmd->read_data_done,
3554 &completed);
3555 if (text_length < 0)
3556 return text_length;
3557
3558 if (completed) {
3559 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3560 } else {
3561 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3562 cmd->read_data_done += text_length;
3563 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3564 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3565 }
3566 hdr->opcode = ISCSI_OP_TEXT_RSP;
3567 padding = ((-text_length) & 3);
3568 hton24(hdr->dlength, text_length);
3569 hdr->itt = cmd->init_task_tag;
3570 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3571 cmd->stat_sn = conn->stat_sn++;
3572 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3573
3574 iscsit_increment_maxcmdsn(cmd, conn->sess);
3575 /*
3576 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3577 * correctly increment MaxCmdSN for each response answering a
3578 * non immediate text request with a valid CmdSN.
3579 */
3580 cmd->maxcmdsn_inc = 0;
3581 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3582 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3583
3584 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3585 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3586 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3587 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3588 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3589
3590 return text_length + padding;
3591 }
3592 EXPORT_SYMBOL(iscsit_build_text_rsp);
3593
3594 static int iscsit_send_text_rsp(
3595 struct iscsi_cmd *cmd,
3596 struct iscsi_conn *conn)
3597 {
3598 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3599 struct kvec *iov;
3600 u32 tx_size = 0;
3601 int text_length, iov_count = 0, rc;
3602
3603 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP);
3604 if (rc < 0)
3605 return rc;
3606
3607 text_length = rc;
3608 iov = &cmd->iov_misc[0];
3609 iov[iov_count].iov_base = cmd->pdu;
3610 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3611 iov[iov_count].iov_base = cmd->buf_ptr;
3612 iov[iov_count++].iov_len = text_length;
3613
3614 tx_size += (ISCSI_HDR_LEN + text_length);
3615
3616 if (conn->conn_ops->HeaderDigest) {
3617 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3618
3619 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3620 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3621
3622 iov[0].iov_len += ISCSI_CRC_LEN;
3623 tx_size += ISCSI_CRC_LEN;
3624 pr_debug("Attaching CRC32 HeaderDigest for"
3625 " Text Response PDU 0x%08x\n", *header_digest);
3626 }
3627
3628 if (conn->conn_ops->DataDigest) {
3629 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3630 cmd->buf_ptr, text_length,
3631 0, NULL, (u8 *)&cmd->data_crc);
3632
3633 iov[iov_count].iov_base = &cmd->data_crc;
3634 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3635 tx_size += ISCSI_CRC_LEN;
3636
3637 pr_debug("Attaching DataDigest for %u bytes of text"
3638 " data, CRC 0x%08x\n", text_length,
3639 cmd->data_crc);
3640 }
3641
3642 cmd->iov_misc_count = iov_count;
3643 cmd->tx_size = tx_size;
3644
3645 return 0;
3646 }
3647
3648 void
3649 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3650 struct iscsi_reject *hdr)
3651 {
3652 hdr->opcode = ISCSI_OP_REJECT;
3653 hdr->reason = cmd->reject_reason;
3654 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3655 hton24(hdr->dlength, ISCSI_HDR_LEN);
3656 hdr->ffffffff = cpu_to_be32(0xffffffff);
3657 cmd->stat_sn = conn->stat_sn++;
3658 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3659 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3660 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3661
3662 }
3663 EXPORT_SYMBOL(iscsit_build_reject);
3664
3665 static int iscsit_send_reject(
3666 struct iscsi_cmd *cmd,
3667 struct iscsi_conn *conn)
3668 {
3669 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3670 struct kvec *iov;
3671 u32 iov_count = 0, tx_size;
3672
3673 iscsit_build_reject(cmd, conn, hdr);
3674
3675 iov = &cmd->iov_misc[0];
3676 iov[iov_count].iov_base = cmd->pdu;
3677 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3678 iov[iov_count].iov_base = cmd->buf_ptr;
3679 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3680
3681 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3682
3683 if (conn->conn_ops->HeaderDigest) {
3684 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3685
3686 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3687 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3688
3689 iov[0].iov_len += ISCSI_CRC_LEN;
3690 tx_size += ISCSI_CRC_LEN;
3691 pr_debug("Attaching CRC32 HeaderDigest for"
3692 " REJECT PDU 0x%08x\n", *header_digest);
3693 }
3694
3695 if (conn->conn_ops->DataDigest) {
3696 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3697 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3698
3699 iov[iov_count].iov_base = &cmd->data_crc;
3700 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3701 tx_size += ISCSI_CRC_LEN;
3702 pr_debug("Attaching CRC32 DataDigest for REJECT"
3703 " PDU 0x%08x\n", cmd->data_crc);
3704 }
3705
3706 cmd->iov_misc_count = iov_count;
3707 cmd->tx_size = tx_size;
3708
3709 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3710 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3711
3712 return 0;
3713 }
3714
3715 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3716 {
3717 int ord, cpu;
3718 /*
3719 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3720 * within iscsit_start_kthreads()
3721 *
3722 * Here we use bitmap_id to determine which CPU that this
3723 * iSCSI connection's RX/TX threads will be scheduled to
3724 * execute upon.
3725 */
3726 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3727 for_each_online_cpu(cpu) {
3728 if (ord-- == 0) {
3729 cpumask_set_cpu(cpu, conn->conn_cpumask);
3730 return;
3731 }
3732 }
3733 /*
3734 * This should never be reached..
3735 */
3736 dump_stack();
3737 cpumask_setall(conn->conn_cpumask);
3738 }
3739
3740 static inline void iscsit_thread_check_cpumask(
3741 struct iscsi_conn *conn,
3742 struct task_struct *p,
3743 int mode)
3744 {
3745 /*
3746 * mode == 1 signals iscsi_target_tx_thread() usage.
3747 * mode == 0 signals iscsi_target_rx_thread() usage.
3748 */
3749 if (mode == 1) {
3750 if (!conn->conn_tx_reset_cpumask)
3751 return;
3752 conn->conn_tx_reset_cpumask = 0;
3753 } else {
3754 if (!conn->conn_rx_reset_cpumask)
3755 return;
3756 conn->conn_rx_reset_cpumask = 0;
3757 }
3758 /*
3759 * Update the CPU mask for this single kthread so that
3760 * both TX and RX kthreads are scheduled to run on the
3761 * same CPU.
3762 */
3763 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3764 }
3765
3766 static int
3767 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3768 {
3769 int ret;
3770
3771 switch (state) {
3772 case ISTATE_SEND_R2T:
3773 ret = iscsit_send_r2t(cmd, conn);
3774 if (ret < 0)
3775 goto err;
3776 break;
3777 case ISTATE_REMOVE:
3778 spin_lock_bh(&conn->cmd_lock);
3779 list_del_init(&cmd->i_conn_node);
3780 spin_unlock_bh(&conn->cmd_lock);
3781
3782 iscsit_free_cmd(cmd, false);
3783 break;
3784 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3785 iscsit_mod_nopin_response_timer(conn);
3786 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3787 if (ret < 0)
3788 goto err;
3789 break;
3790 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3791 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3792 if (ret < 0)
3793 goto err;
3794 break;
3795 default:
3796 pr_err("Unknown Opcode: 0x%02x ITT:"
3797 " 0x%08x, i_state: %d on CID: %hu\n",
3798 cmd->iscsi_opcode, cmd->init_task_tag, state,
3799 conn->cid);
3800 goto err;
3801 }
3802
3803 return 0;
3804
3805 err:
3806 return -1;
3807 }
3808
3809 static int
3810 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3811 {
3812 struct iscsit_transport *t = conn->conn_transport;
3813 struct iscsi_queue_req *qr;
3814 struct iscsi_cmd *cmd;
3815 u8 state;
3816 int ret;
3817
3818 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3819 atomic_set(&conn->check_immediate_queue, 0);
3820 cmd = qr->cmd;
3821 state = qr->state;
3822 kmem_cache_free(lio_qr_cache, qr);
3823
3824 ret = t->iscsit_immediate_queue(conn, cmd, state);
3825 if (ret < 0)
3826 return ret;
3827 }
3828
3829 return 0;
3830 }
3831
3832 static int
3833 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3834 {
3835 int ret;
3836
3837 check_rsp_state:
3838 switch (state) {
3839 case ISTATE_SEND_DATAIN:
3840 ret = iscsit_send_datain(cmd, conn);
3841 if (ret < 0)
3842 goto err;
3843 else if (!ret)
3844 /* more drs */
3845 goto check_rsp_state;
3846 else if (ret == 1) {
3847 /* all done */
3848 spin_lock_bh(&cmd->istate_lock);
3849 cmd->i_state = ISTATE_SENT_STATUS;
3850 spin_unlock_bh(&cmd->istate_lock);
3851
3852 if (atomic_read(&conn->check_immediate_queue))
3853 return 1;
3854
3855 return 0;
3856 } else if (ret == 2) {
3857 /* Still must send status,
3858 SCF_TRANSPORT_TASK_SENSE was set */
3859 spin_lock_bh(&cmd->istate_lock);
3860 cmd->i_state = ISTATE_SEND_STATUS;
3861 spin_unlock_bh(&cmd->istate_lock);
3862 state = ISTATE_SEND_STATUS;
3863 goto check_rsp_state;
3864 }
3865
3866 break;
3867 case ISTATE_SEND_STATUS:
3868 case ISTATE_SEND_STATUS_RECOVERY:
3869 ret = iscsit_send_response(cmd, conn);
3870 break;
3871 case ISTATE_SEND_LOGOUTRSP:
3872 ret = iscsit_send_logout(cmd, conn);
3873 break;
3874 case ISTATE_SEND_ASYNCMSG:
3875 ret = iscsit_send_conn_drop_async_message(
3876 cmd, conn);
3877 break;
3878 case ISTATE_SEND_NOPIN:
3879 ret = iscsit_send_nopin(cmd, conn);
3880 break;
3881 case ISTATE_SEND_REJECT:
3882 ret = iscsit_send_reject(cmd, conn);
3883 break;
3884 case ISTATE_SEND_TASKMGTRSP:
3885 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3886 if (ret != 0)
3887 break;
3888 ret = iscsit_tmr_post_handler(cmd, conn);
3889 if (ret != 0)
3890 iscsit_fall_back_to_erl0(conn->sess);
3891 break;
3892 case ISTATE_SEND_TEXTRSP:
3893 ret = iscsit_send_text_rsp(cmd, conn);
3894 break;
3895 default:
3896 pr_err("Unknown Opcode: 0x%02x ITT:"
3897 " 0x%08x, i_state: %d on CID: %hu\n",
3898 cmd->iscsi_opcode, cmd->init_task_tag,
3899 state, conn->cid);
3900 goto err;
3901 }
3902 if (ret < 0)
3903 goto err;
3904
3905 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3906 iscsit_tx_thread_wait_for_tcp(conn);
3907 iscsit_unmap_iovec(cmd);
3908 goto err;
3909 }
3910 iscsit_unmap_iovec(cmd);
3911
3912 switch (state) {
3913 case ISTATE_SEND_LOGOUTRSP:
3914 if (!iscsit_logout_post_handler(cmd, conn))
3915 return -ECONNRESET;
3916 /* fall through */
3917 case ISTATE_SEND_STATUS:
3918 case ISTATE_SEND_ASYNCMSG:
3919 case ISTATE_SEND_NOPIN:
3920 case ISTATE_SEND_STATUS_RECOVERY:
3921 case ISTATE_SEND_TEXTRSP:
3922 case ISTATE_SEND_TASKMGTRSP:
3923 case ISTATE_SEND_REJECT:
3924 spin_lock_bh(&cmd->istate_lock);
3925 cmd->i_state = ISTATE_SENT_STATUS;
3926 spin_unlock_bh(&cmd->istate_lock);
3927 break;
3928 default:
3929 pr_err("Unknown Opcode: 0x%02x ITT:"
3930 " 0x%08x, i_state: %d on CID: %hu\n",
3931 cmd->iscsi_opcode, cmd->init_task_tag,
3932 cmd->i_state, conn->cid);
3933 goto err;
3934 }
3935
3936 if (atomic_read(&conn->check_immediate_queue))
3937 return 1;
3938
3939 return 0;
3940
3941 err:
3942 return -1;
3943 }
3944
3945 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3946 {
3947 struct iscsit_transport *t = conn->conn_transport;
3948 struct iscsi_queue_req *qr;
3949 struct iscsi_cmd *cmd;
3950 u8 state;
3951 int ret;
3952
3953 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3954 cmd = qr->cmd;
3955 state = qr->state;
3956 kmem_cache_free(lio_qr_cache, qr);
3957
3958 ret = t->iscsit_response_queue(conn, cmd, state);
3959 if (ret == 1 || ret < 0)
3960 return ret;
3961 }
3962
3963 return 0;
3964 }
3965
3966 int iscsi_target_tx_thread(void *arg)
3967 {
3968 int ret = 0;
3969 struct iscsi_conn *conn = arg;
3970 /*
3971 * Allow ourselves to be interrupted by SIGINT so that a
3972 * connection recovery / failure event can be triggered externally.
3973 */
3974 allow_signal(SIGINT);
3975
3976 while (!kthread_should_stop()) {
3977 /*
3978 * Ensure that both TX and RX per connection kthreads
3979 * are scheduled to run on the same CPU.
3980 */
3981 iscsit_thread_check_cpumask(conn, current, 1);
3982
3983 wait_event_interruptible(conn->queues_wq,
3984 !iscsit_conn_all_queues_empty(conn));
3985
3986 if (signal_pending(current))
3987 goto transport_err;
3988
3989 get_immediate:
3990 ret = iscsit_handle_immediate_queue(conn);
3991 if (ret < 0)
3992 goto transport_err;
3993
3994 ret = iscsit_handle_response_queue(conn);
3995 if (ret == 1)
3996 goto get_immediate;
3997 else if (ret == -ECONNRESET)
3998 goto out;
3999 else if (ret < 0)
4000 goto transport_err;
4001 }
4002
4003 transport_err:
4004 iscsit_take_action_for_connection_exit(conn);
4005 out:
4006 return 0;
4007 }
4008
4009 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
4010 {
4011 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
4012 struct iscsi_cmd *cmd;
4013 int ret = 0;
4014
4015 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
4016 case ISCSI_OP_SCSI_CMD:
4017 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4018 if (!cmd)
4019 goto reject;
4020
4021 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
4022 break;
4023 case ISCSI_OP_SCSI_DATA_OUT:
4024 ret = iscsit_handle_data_out(conn, buf);
4025 break;
4026 case ISCSI_OP_NOOP_OUT:
4027 cmd = NULL;
4028 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4029 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4030 if (!cmd)
4031 goto reject;
4032 }
4033 ret = iscsit_handle_nop_out(conn, cmd, buf);
4034 break;
4035 case ISCSI_OP_SCSI_TMFUNC:
4036 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4037 if (!cmd)
4038 goto reject;
4039
4040 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4041 break;
4042 case ISCSI_OP_TEXT:
4043 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4044 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4045 if (!cmd)
4046 goto reject;
4047 } else {
4048 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4049 if (!cmd)
4050 goto reject;
4051 }
4052
4053 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4054 break;
4055 case ISCSI_OP_LOGOUT:
4056 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4057 if (!cmd)
4058 goto reject;
4059
4060 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4061 if (ret > 0)
4062 wait_for_completion_timeout(&conn->conn_logout_comp,
4063 SECONDS_FOR_LOGOUT_COMP * HZ);
4064 break;
4065 case ISCSI_OP_SNACK:
4066 ret = iscsit_handle_snack(conn, buf);
4067 break;
4068 default:
4069 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4070 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4071 pr_err("Cannot recover from unknown"
4072 " opcode while ERL=0, closing iSCSI connection.\n");
4073 return -1;
4074 }
4075 if (!conn->conn_ops->OFMarker) {
4076 pr_err("Unable to recover from unknown"
4077 " opcode while OFMarker=No, closing iSCSI"
4078 " connection.\n");
4079 return -1;
4080 }
4081 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4082 pr_err("Unable to recover from unknown"
4083 " opcode, closing iSCSI connection.\n");
4084 return -1;
4085 }
4086 break;
4087 }
4088
4089 return ret;
4090 reject:
4091 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4092 }
4093
4094 int iscsi_target_rx_thread(void *arg)
4095 {
4096 int ret;
4097 u8 buffer[ISCSI_HDR_LEN], opcode;
4098 u32 checksum = 0, digest = 0;
4099 struct iscsi_conn *conn = arg;
4100 struct kvec iov;
4101 /*
4102 * Allow ourselves to be interrupted by SIGINT so that a
4103 * connection recovery / failure event can be triggered externally.
4104 */
4105 allow_signal(SIGINT);
4106
4107 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4108 struct completion comp;
4109 int rc;
4110
4111 init_completion(&comp);
4112 rc = wait_for_completion_interruptible(&comp);
4113 if (rc < 0)
4114 goto transport_err;
4115
4116 goto transport_err;
4117 }
4118
4119 while (!kthread_should_stop()) {
4120 /*
4121 * Ensure that both TX and RX per connection kthreads
4122 * are scheduled to run on the same CPU.
4123 */
4124 iscsit_thread_check_cpumask(conn, current, 0);
4125
4126 memset(buffer, 0, ISCSI_HDR_LEN);
4127 memset(&iov, 0, sizeof(struct kvec));
4128
4129 iov.iov_base = buffer;
4130 iov.iov_len = ISCSI_HDR_LEN;
4131
4132 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4133 if (ret != ISCSI_HDR_LEN) {
4134 iscsit_rx_thread_wait_for_tcp(conn);
4135 goto transport_err;
4136 }
4137
4138 if (conn->conn_ops->HeaderDigest) {
4139 iov.iov_base = &digest;
4140 iov.iov_len = ISCSI_CRC_LEN;
4141
4142 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4143 if (ret != ISCSI_CRC_LEN) {
4144 iscsit_rx_thread_wait_for_tcp(conn);
4145 goto transport_err;
4146 }
4147
4148 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4149 buffer, ISCSI_HDR_LEN,
4150 0, NULL, (u8 *)&checksum);
4151
4152 if (digest != checksum) {
4153 pr_err("HeaderDigest CRC32C failed,"
4154 " received 0x%08x, computed 0x%08x\n",
4155 digest, checksum);
4156 /*
4157 * Set the PDU to 0xff so it will intentionally
4158 * hit default in the switch below.
4159 */
4160 memset(buffer, 0xff, ISCSI_HDR_LEN);
4161 atomic_long_inc(&conn->sess->conn_digest_errors);
4162 } else {
4163 pr_debug("Got HeaderDigest CRC32C"
4164 " 0x%08x\n", checksum);
4165 }
4166 }
4167
4168 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4169 goto transport_err;
4170
4171 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4172
4173 if (conn->sess->sess_ops->SessionType &&
4174 ((!(opcode & ISCSI_OP_TEXT)) ||
4175 (!(opcode & ISCSI_OP_LOGOUT)))) {
4176 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4177 " while in Discovery Session, rejecting.\n", opcode);
4178 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4179 buffer);
4180 goto transport_err;
4181 }
4182
4183 ret = iscsi_target_rx_opcode(conn, buffer);
4184 if (ret < 0)
4185 goto transport_err;
4186 }
4187
4188 transport_err:
4189 if (!signal_pending(current))
4190 atomic_set(&conn->transport_failed, 1);
4191 iscsit_take_action_for_connection_exit(conn);
4192 return 0;
4193 }
4194
4195 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4196 {
4197 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4198 struct iscsi_session *sess = conn->sess;
4199 /*
4200 * We expect this function to only ever be called from either RX or TX
4201 * thread context via iscsit_close_connection() once the other context
4202 * has been reset -> returned sleeping pre-handler state.
4203 */
4204 spin_lock_bh(&conn->cmd_lock);
4205 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4206
4207 list_del_init(&cmd->i_conn_node);
4208 spin_unlock_bh(&conn->cmd_lock);
4209
4210 iscsit_increment_maxcmdsn(cmd, sess);
4211
4212 iscsit_free_cmd(cmd, true);
4213
4214 spin_lock_bh(&conn->cmd_lock);
4215 }
4216 spin_unlock_bh(&conn->cmd_lock);
4217 }
4218
4219 static void iscsit_stop_timers_for_cmds(
4220 struct iscsi_conn *conn)
4221 {
4222 struct iscsi_cmd *cmd;
4223
4224 spin_lock_bh(&conn->cmd_lock);
4225 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4226 if (cmd->data_direction == DMA_TO_DEVICE)
4227 iscsit_stop_dataout_timer(cmd);
4228 }
4229 spin_unlock_bh(&conn->cmd_lock);
4230 }
4231
4232 int iscsit_close_connection(
4233 struct iscsi_conn *conn)
4234 {
4235 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4236 struct iscsi_session *sess = conn->sess;
4237
4238 pr_debug("Closing iSCSI connection CID %hu on SID:"
4239 " %u\n", conn->cid, sess->sid);
4240 /*
4241 * Always up conn_logout_comp for the traditional TCP case just in case
4242 * the RX Thread in iscsi_target_rx_opcode() is sleeping and the logout
4243 * response never got sent because the connection failed.
4244 *
4245 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4246 * to signal logout response TX interrupt completion. Go ahead and skip
4247 * this for iser since isert_rx_opcode() does not wait on logout failure,
4248 * and to avoid iscsi_conn pointer dereference in iser-target code.
4249 */
4250 if (conn->conn_transport->transport_type == ISCSI_TCP)
4251 complete(&conn->conn_logout_comp);
4252
4253 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4254 if (conn->tx_thread &&
4255 cmpxchg(&conn->tx_thread_active, true, false)) {
4256 send_sig(SIGINT, conn->tx_thread, 1);
4257 kthread_stop(conn->tx_thread);
4258 }
4259 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4260 if (conn->rx_thread &&
4261 cmpxchg(&conn->rx_thread_active, true, false)) {
4262 send_sig(SIGINT, conn->rx_thread, 1);
4263 kthread_stop(conn->rx_thread);
4264 }
4265 }
4266
4267 spin_lock(&iscsit_global->ts_bitmap_lock);
4268 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4269 get_order(1));
4270 spin_unlock(&iscsit_global->ts_bitmap_lock);
4271
4272 iscsit_stop_timers_for_cmds(conn);
4273 iscsit_stop_nopin_response_timer(conn);
4274 iscsit_stop_nopin_timer(conn);
4275
4276 if (conn->conn_transport->iscsit_wait_conn)
4277 conn->conn_transport->iscsit_wait_conn(conn);
4278
4279 /*
4280 * During Connection recovery drop unacknowledged out of order
4281 * commands for this connection, and prepare the other commands
4282 * for realligence.
4283 *
4284 * During normal operation clear the out of order commands (but
4285 * do not free the struct iscsi_ooo_cmdsn's) and release all
4286 * struct iscsi_cmds.
4287 */
4288 if (atomic_read(&conn->connection_recovery)) {
4289 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4290 iscsit_prepare_cmds_for_realligance(conn);
4291 } else {
4292 iscsit_clear_ooo_cmdsns_for_conn(conn);
4293 iscsit_release_commands_from_conn(conn);
4294 }
4295 iscsit_free_queue_reqs_for_conn(conn);
4296
4297 /*
4298 * Handle decrementing session or connection usage count if
4299 * a logout response was not able to be sent because the
4300 * connection failed. Fall back to Session Recovery here.
4301 */
4302 if (atomic_read(&conn->conn_logout_remove)) {
4303 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4304 iscsit_dec_conn_usage_count(conn);
4305 iscsit_dec_session_usage_count(sess);
4306 }
4307 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4308 iscsit_dec_conn_usage_count(conn);
4309
4310 atomic_set(&conn->conn_logout_remove, 0);
4311 atomic_set(&sess->session_reinstatement, 0);
4312 atomic_set(&sess->session_fall_back_to_erl0, 1);
4313 }
4314
4315 spin_lock_bh(&sess->conn_lock);
4316 list_del(&conn->conn_list);
4317
4318 /*
4319 * Attempt to let the Initiator know this connection failed by
4320 * sending an Connection Dropped Async Message on another
4321 * active connection.
4322 */
4323 if (atomic_read(&conn->connection_recovery))
4324 iscsit_build_conn_drop_async_message(conn);
4325
4326 spin_unlock_bh(&sess->conn_lock);
4327
4328 /*
4329 * If connection reinstatement is being performed on this connection,
4330 * up the connection reinstatement semaphore that is being blocked on
4331 * in iscsit_cause_connection_reinstatement().
4332 */
4333 spin_lock_bh(&conn->state_lock);
4334 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4335 spin_unlock_bh(&conn->state_lock);
4336 complete(&conn->conn_wait_comp);
4337 wait_for_completion(&conn->conn_post_wait_comp);
4338 spin_lock_bh(&conn->state_lock);
4339 }
4340
4341 /*
4342 * If connection reinstatement is being performed on this connection
4343 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4344 * connection wait rcfr semaphore that is being blocked on
4345 * an iscsit_connection_reinstatement_rcfr().
4346 */
4347 if (atomic_read(&conn->connection_wait_rcfr)) {
4348 spin_unlock_bh(&conn->state_lock);
4349 complete(&conn->conn_wait_rcfr_comp);
4350 wait_for_completion(&conn->conn_post_wait_comp);
4351 spin_lock_bh(&conn->state_lock);
4352 }
4353 atomic_set(&conn->connection_reinstatement, 1);
4354 spin_unlock_bh(&conn->state_lock);
4355
4356 /*
4357 * If any other processes are accessing this connection pointer we
4358 * must wait until they have completed.
4359 */
4360 iscsit_check_conn_usage_count(conn);
4361
4362 if (conn->conn_rx_hash.tfm)
4363 crypto_free_hash(conn->conn_rx_hash.tfm);
4364 if (conn->conn_tx_hash.tfm)
4365 crypto_free_hash(conn->conn_tx_hash.tfm);
4366
4367 free_cpumask_var(conn->conn_cpumask);
4368
4369 kfree(conn->conn_ops);
4370 conn->conn_ops = NULL;
4371
4372 if (conn->sock)
4373 sock_release(conn->sock);
4374
4375 if (conn->conn_transport->iscsit_free_conn)
4376 conn->conn_transport->iscsit_free_conn(conn);
4377
4378 iscsit_put_transport(conn->conn_transport);
4379
4380 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4381 conn->conn_state = TARG_CONN_STATE_FREE;
4382 kfree(conn);
4383
4384 spin_lock_bh(&sess->conn_lock);
4385 atomic_dec(&sess->nconn);
4386 pr_debug("Decremented iSCSI connection count to %hu from node:"
4387 " %s\n", atomic_read(&sess->nconn),
4388 sess->sess_ops->InitiatorName);
4389 /*
4390 * Make sure that if one connection fails in an non ERL=2 iSCSI
4391 * Session that they all fail.
4392 */
4393 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4394 !atomic_read(&sess->session_logout))
4395 atomic_set(&sess->session_fall_back_to_erl0, 1);
4396
4397 /*
4398 * If this was not the last connection in the session, and we are
4399 * performing session reinstatement or falling back to ERL=0, call
4400 * iscsit_stop_session() without sleeping to shutdown the other
4401 * active connections.
4402 */
4403 if (atomic_read(&sess->nconn)) {
4404 if (!atomic_read(&sess->session_reinstatement) &&
4405 !atomic_read(&sess->session_fall_back_to_erl0)) {
4406 spin_unlock_bh(&sess->conn_lock);
4407 return 0;
4408 }
4409 if (!atomic_read(&sess->session_stop_active)) {
4410 atomic_set(&sess->session_stop_active, 1);
4411 spin_unlock_bh(&sess->conn_lock);
4412 iscsit_stop_session(sess, 0, 0);
4413 return 0;
4414 }
4415 spin_unlock_bh(&sess->conn_lock);
4416 return 0;
4417 }
4418
4419 /*
4420 * If this was the last connection in the session and one of the
4421 * following is occurring:
4422 *
4423 * Session Reinstatement is not being performed, and are falling back
4424 * to ERL=0 call iscsit_close_session().
4425 *
4426 * Session Logout was requested. iscsit_close_session() will be called
4427 * elsewhere.
4428 *
4429 * Session Continuation is not being performed, start the Time2Retain
4430 * handler and check if sleep_on_sess_wait_sem is active.
4431 */
4432 if (!atomic_read(&sess->session_reinstatement) &&
4433 atomic_read(&sess->session_fall_back_to_erl0)) {
4434 spin_unlock_bh(&sess->conn_lock);
4435 target_put_session(sess->se_sess);
4436
4437 return 0;
4438 } else if (atomic_read(&sess->session_logout)) {
4439 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4440 sess->session_state = TARG_SESS_STATE_FREE;
4441 spin_unlock_bh(&sess->conn_lock);
4442
4443 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4444 complete(&sess->session_wait_comp);
4445
4446 return 0;
4447 } else {
4448 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4449 sess->session_state = TARG_SESS_STATE_FAILED;
4450
4451 if (!atomic_read(&sess->session_continuation)) {
4452 spin_unlock_bh(&sess->conn_lock);
4453 iscsit_start_time2retain_handler(sess);
4454 } else
4455 spin_unlock_bh(&sess->conn_lock);
4456
4457 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4458 complete(&sess->session_wait_comp);
4459
4460 return 0;
4461 }
4462 spin_unlock_bh(&sess->conn_lock);
4463
4464 return 0;
4465 }
4466
4467 int iscsit_close_session(struct iscsi_session *sess)
4468 {
4469 struct iscsi_portal_group *tpg = sess->tpg;
4470 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4471
4472 if (atomic_read(&sess->nconn)) {
4473 pr_err("%d connection(s) still exist for iSCSI session"
4474 " to %s\n", atomic_read(&sess->nconn),
4475 sess->sess_ops->InitiatorName);
4476 BUG();
4477 }
4478
4479 spin_lock_bh(&se_tpg->session_lock);
4480 atomic_set(&sess->session_logout, 1);
4481 atomic_set(&sess->session_reinstatement, 1);
4482 iscsit_stop_time2retain_timer(sess);
4483 spin_unlock_bh(&se_tpg->session_lock);
4484
4485 /*
4486 * transport_deregister_session_configfs() will clear the
4487 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4488 * can be setting it again with __transport_register_session() in
4489 * iscsi_post_login_handler() again after the iscsit_stop_session()
4490 * completes in iscsi_np context.
4491 */
4492 transport_deregister_session_configfs(sess->se_sess);
4493
4494 /*
4495 * If any other processes are accessing this session pointer we must
4496 * wait until they have completed. If we are in an interrupt (the
4497 * time2retain handler) and contain and active session usage count we
4498 * restart the timer and exit.
4499 */
4500 if (!in_interrupt()) {
4501 if (iscsit_check_session_usage_count(sess) == 1)
4502 iscsit_stop_session(sess, 1, 1);
4503 } else {
4504 if (iscsit_check_session_usage_count(sess) == 2) {
4505 atomic_set(&sess->session_logout, 0);
4506 iscsit_start_time2retain_handler(sess);
4507 return 0;
4508 }
4509 }
4510
4511 transport_deregister_session(sess->se_sess);
4512
4513 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4514 iscsit_free_connection_recovery_entires(sess);
4515
4516 iscsit_free_all_ooo_cmdsns(sess);
4517
4518 spin_lock_bh(&se_tpg->session_lock);
4519 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4520 sess->session_state = TARG_SESS_STATE_FREE;
4521 pr_debug("Released iSCSI session from node: %s\n",
4522 sess->sess_ops->InitiatorName);
4523 tpg->nsessions--;
4524 if (tpg->tpg_tiqn)
4525 tpg->tpg_tiqn->tiqn_nsessions--;
4526
4527 pr_debug("Decremented number of active iSCSI Sessions on"
4528 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4529
4530 spin_lock(&sess_idr_lock);
4531 idr_remove(&sess_idr, sess->session_index);
4532 spin_unlock(&sess_idr_lock);
4533
4534 kfree(sess->sess_ops);
4535 sess->sess_ops = NULL;
4536 spin_unlock_bh(&se_tpg->session_lock);
4537
4538 kfree(sess);
4539 return 0;
4540 }
4541
4542 static void iscsit_logout_post_handler_closesession(
4543 struct iscsi_conn *conn)
4544 {
4545 struct iscsi_session *sess = conn->sess;
4546 int sleep = cmpxchg(&conn->tx_thread_active, true, false);
4547
4548 atomic_set(&conn->conn_logout_remove, 0);
4549 complete(&conn->conn_logout_comp);
4550
4551 iscsit_dec_conn_usage_count(conn);
4552 iscsit_stop_session(sess, sleep, sleep);
4553 iscsit_dec_session_usage_count(sess);
4554 target_put_session(sess->se_sess);
4555 }
4556
4557 static void iscsit_logout_post_handler_samecid(
4558 struct iscsi_conn *conn)
4559 {
4560 int sleep = 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_cause_connection_reinstatement(conn, sleep);
4566 iscsit_dec_conn_usage_count(conn);
4567 }
4568
4569 static void iscsit_logout_post_handler_diffcid(
4570 struct iscsi_conn *conn,
4571 u16 cid)
4572 {
4573 struct iscsi_conn *l_conn;
4574 struct iscsi_session *sess = conn->sess;
4575 bool conn_found = false;
4576
4577 if (!sess)
4578 return;
4579
4580 spin_lock_bh(&sess->conn_lock);
4581 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4582 if (l_conn->cid == cid) {
4583 iscsit_inc_conn_usage_count(l_conn);
4584 conn_found = true;
4585 break;
4586 }
4587 }
4588 spin_unlock_bh(&sess->conn_lock);
4589
4590 if (!conn_found)
4591 return;
4592
4593 if (l_conn->sock)
4594 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4595
4596 spin_lock_bh(&l_conn->state_lock);
4597 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4598 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4599 spin_unlock_bh(&l_conn->state_lock);
4600
4601 iscsit_cause_connection_reinstatement(l_conn, 1);
4602 iscsit_dec_conn_usage_count(l_conn);
4603 }
4604
4605 /*
4606 * Return of 0 causes the TX thread to restart.
4607 */
4608 int iscsit_logout_post_handler(
4609 struct iscsi_cmd *cmd,
4610 struct iscsi_conn *conn)
4611 {
4612 int ret = 0;
4613
4614 switch (cmd->logout_reason) {
4615 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4616 switch (cmd->logout_response) {
4617 case ISCSI_LOGOUT_SUCCESS:
4618 case ISCSI_LOGOUT_CLEANUP_FAILED:
4619 default:
4620 iscsit_logout_post_handler_closesession(conn);
4621 break;
4622 }
4623 ret = 0;
4624 break;
4625 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4626 if (conn->cid == cmd->logout_cid) {
4627 switch (cmd->logout_response) {
4628 case ISCSI_LOGOUT_SUCCESS:
4629 case ISCSI_LOGOUT_CLEANUP_FAILED:
4630 default:
4631 iscsit_logout_post_handler_samecid(conn);
4632 break;
4633 }
4634 ret = 0;
4635 } else {
4636 switch (cmd->logout_response) {
4637 case ISCSI_LOGOUT_SUCCESS:
4638 iscsit_logout_post_handler_diffcid(conn,
4639 cmd->logout_cid);
4640 break;
4641 case ISCSI_LOGOUT_CID_NOT_FOUND:
4642 case ISCSI_LOGOUT_CLEANUP_FAILED:
4643 default:
4644 break;
4645 }
4646 ret = 1;
4647 }
4648 break;
4649 case ISCSI_LOGOUT_REASON_RECOVERY:
4650 switch (cmd->logout_response) {
4651 case ISCSI_LOGOUT_SUCCESS:
4652 case ISCSI_LOGOUT_CID_NOT_FOUND:
4653 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4654 case ISCSI_LOGOUT_CLEANUP_FAILED:
4655 default:
4656 break;
4657 }
4658 ret = 1;
4659 break;
4660 default:
4661 break;
4662
4663 }
4664 return ret;
4665 }
4666 EXPORT_SYMBOL(iscsit_logout_post_handler);
4667
4668 void iscsit_fail_session(struct iscsi_session *sess)
4669 {
4670 struct iscsi_conn *conn;
4671
4672 spin_lock_bh(&sess->conn_lock);
4673 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4674 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4675 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4676 }
4677 spin_unlock_bh(&sess->conn_lock);
4678
4679 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4680 sess->session_state = TARG_SESS_STATE_FAILED;
4681 }
4682
4683 int iscsit_free_session(struct iscsi_session *sess)
4684 {
4685 u16 conn_count = atomic_read(&sess->nconn);
4686 struct iscsi_conn *conn, *conn_tmp = NULL;
4687 int is_last;
4688
4689 spin_lock_bh(&sess->conn_lock);
4690 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4691
4692 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4693 conn_list) {
4694 if (conn_count == 0)
4695 break;
4696
4697 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4698 is_last = 1;
4699 } else {
4700 iscsit_inc_conn_usage_count(conn_tmp);
4701 is_last = 0;
4702 }
4703 iscsit_inc_conn_usage_count(conn);
4704
4705 spin_unlock_bh(&sess->conn_lock);
4706 iscsit_cause_connection_reinstatement(conn, 1);
4707 spin_lock_bh(&sess->conn_lock);
4708
4709 iscsit_dec_conn_usage_count(conn);
4710 if (is_last == 0)
4711 iscsit_dec_conn_usage_count(conn_tmp);
4712
4713 conn_count--;
4714 }
4715
4716 if (atomic_read(&sess->nconn)) {
4717 spin_unlock_bh(&sess->conn_lock);
4718 wait_for_completion(&sess->session_wait_comp);
4719 } else
4720 spin_unlock_bh(&sess->conn_lock);
4721
4722 target_put_session(sess->se_sess);
4723 return 0;
4724 }
4725
4726 void iscsit_stop_session(
4727 struct iscsi_session *sess,
4728 int session_sleep,
4729 int connection_sleep)
4730 {
4731 u16 conn_count = atomic_read(&sess->nconn);
4732 struct iscsi_conn *conn, *conn_tmp = NULL;
4733 int is_last;
4734
4735 spin_lock_bh(&sess->conn_lock);
4736 if (session_sleep)
4737 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4738
4739 if (connection_sleep) {
4740 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4741 conn_list) {
4742 if (conn_count == 0)
4743 break;
4744
4745 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4746 is_last = 1;
4747 } else {
4748 iscsit_inc_conn_usage_count(conn_tmp);
4749 is_last = 0;
4750 }
4751 iscsit_inc_conn_usage_count(conn);
4752
4753 spin_unlock_bh(&sess->conn_lock);
4754 iscsit_cause_connection_reinstatement(conn, 1);
4755 spin_lock_bh(&sess->conn_lock);
4756
4757 iscsit_dec_conn_usage_count(conn);
4758 if (is_last == 0)
4759 iscsit_dec_conn_usage_count(conn_tmp);
4760 conn_count--;
4761 }
4762 } else {
4763 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4764 iscsit_cause_connection_reinstatement(conn, 0);
4765 }
4766
4767 if (session_sleep && atomic_read(&sess->nconn)) {
4768 spin_unlock_bh(&sess->conn_lock);
4769 wait_for_completion(&sess->session_wait_comp);
4770 } else
4771 spin_unlock_bh(&sess->conn_lock);
4772 }
4773
4774 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4775 {
4776 struct iscsi_session *sess;
4777 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4778 struct se_session *se_sess, *se_sess_tmp;
4779 int session_count = 0;
4780
4781 spin_lock_bh(&se_tpg->session_lock);
4782 if (tpg->nsessions && !force) {
4783 spin_unlock_bh(&se_tpg->session_lock);
4784 return -1;
4785 }
4786
4787 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4788 sess_list) {
4789 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4790
4791 spin_lock(&sess->conn_lock);
4792 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4793 atomic_read(&sess->session_logout) ||
4794 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4795 spin_unlock(&sess->conn_lock);
4796 continue;
4797 }
4798 atomic_set(&sess->session_reinstatement, 1);
4799 spin_unlock(&sess->conn_lock);
4800 spin_unlock_bh(&se_tpg->session_lock);
4801
4802 iscsit_free_session(sess);
4803 spin_lock_bh(&se_tpg->session_lock);
4804
4805 session_count++;
4806 }
4807 spin_unlock_bh(&se_tpg->session_lock);
4808
4809 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4810 " Group: %hu\n", session_count, tpg->tpgt);
4811 return 0;
4812 }
4813
4814 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4815 MODULE_VERSION("4.1.x");
4816 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4817 MODULE_LICENSE("GPL");
4818
4819 module_init(iscsi_target_init_module);
4820 module_exit(iscsi_target_cleanup_module);
ubuntu-bionic-kernel mirror