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Merge tag 'ntb-4.2' of git://github.com/jonmason/ntb
[mirror_ubuntu-zesty-kernel.git] / drivers / target / iscsi / iscsi_target.c
1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19 #include <linux/string.h>
20 #include <linux/kthread.h>
21 #include <linux/crypto.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
25 #include <linux/idr.h>
26 #include <asm/unaligned.h>
27 #include <scsi/scsi_proto.h>
28 #include <scsi/iscsi_proto.h>
29 #include <scsi/scsi_tcq.h>
30 #include <target/target_core_base.h>
31 #include <target/target_core_fabric.h>
32 #include <target/target_core_configfs.h>
33
34 #include <target/iscsi/iscsi_target_core.h>
35 #include "iscsi_target_parameters.h"
36 #include "iscsi_target_seq_pdu_list.h"
37 #include "iscsi_target_datain_values.h"
38 #include "iscsi_target_erl0.h"
39 #include "iscsi_target_erl1.h"
40 #include "iscsi_target_erl2.h"
41 #include "iscsi_target_login.h"
42 #include "iscsi_target_tmr.h"
43 #include "iscsi_target_tpg.h"
44 #include "iscsi_target_util.h"
45 #include "iscsi_target.h"
46 #include "iscsi_target_device.h"
47 #include <target/iscsi/iscsi_target_stat.h>
48
49 #include <target/iscsi/iscsi_transport.h>
50
51 static LIST_HEAD(g_tiqn_list);
52 static LIST_HEAD(g_np_list);
53 static DEFINE_SPINLOCK(tiqn_lock);
54 static DEFINE_MUTEX(np_lock);
55
56 static struct idr tiqn_idr;
57 struct idr sess_idr;
58 struct mutex auth_id_lock;
59 spinlock_t sess_idr_lock;
60
61 struct iscsit_global *iscsit_global;
62
63 struct kmem_cache *lio_qr_cache;
64 struct kmem_cache *lio_dr_cache;
65 struct kmem_cache *lio_ooo_cache;
66 struct kmem_cache *lio_r2t_cache;
67
68 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
69 struct iscsi_scsi_req *, u32);
70
71 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
72 {
73 struct iscsi_tiqn *tiqn = NULL;
74
75 spin_lock(&tiqn_lock);
76 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
77 if (!strcmp(tiqn->tiqn, buf)) {
78
79 spin_lock(&tiqn->tiqn_state_lock);
80 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
81 tiqn->tiqn_access_count++;
82 spin_unlock(&tiqn->tiqn_state_lock);
83 spin_unlock(&tiqn_lock);
84 return tiqn;
85 }
86 spin_unlock(&tiqn->tiqn_state_lock);
87 }
88 }
89 spin_unlock(&tiqn_lock);
90
91 return NULL;
92 }
93
94 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
95 {
96 spin_lock(&tiqn->tiqn_state_lock);
97 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
98 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
99 spin_unlock(&tiqn->tiqn_state_lock);
100 return 0;
101 }
102 spin_unlock(&tiqn->tiqn_state_lock);
103
104 return -1;
105 }
106
107 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
108 {
109 spin_lock(&tiqn->tiqn_state_lock);
110 tiqn->tiqn_access_count--;
111 spin_unlock(&tiqn->tiqn_state_lock);
112 }
113
114 /*
115 * Note that IQN formatting is expected to be done in userspace, and
116 * no explict IQN format checks are done here.
117 */
118 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
119 {
120 struct iscsi_tiqn *tiqn = NULL;
121 int ret;
122
123 if (strlen(buf) >= ISCSI_IQN_LEN) {
124 pr_err("Target IQN exceeds %d bytes\n",
125 ISCSI_IQN_LEN);
126 return ERR_PTR(-EINVAL);
127 }
128
129 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
130 if (!tiqn) {
131 pr_err("Unable to allocate struct iscsi_tiqn\n");
132 return ERR_PTR(-ENOMEM);
133 }
134
135 sprintf(tiqn->tiqn, "%s", buf);
136 INIT_LIST_HEAD(&tiqn->tiqn_list);
137 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
138 spin_lock_init(&tiqn->tiqn_state_lock);
139 spin_lock_init(&tiqn->tiqn_tpg_lock);
140 spin_lock_init(&tiqn->sess_err_stats.lock);
141 spin_lock_init(&tiqn->login_stats.lock);
142 spin_lock_init(&tiqn->logout_stats.lock);
143
144 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
145
146 idr_preload(GFP_KERNEL);
147 spin_lock(&tiqn_lock);
148
149 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
150 if (ret < 0) {
151 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
152 spin_unlock(&tiqn_lock);
153 idr_preload_end();
154 kfree(tiqn);
155 return ERR_PTR(ret);
156 }
157 tiqn->tiqn_index = ret;
158 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
159
160 spin_unlock(&tiqn_lock);
161 idr_preload_end();
162
163 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
164
165 return tiqn;
166
167 }
168
169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
170 {
171 /*
172 * Wait for accesses to said struct iscsi_tiqn to end.
173 */
174 spin_lock(&tiqn->tiqn_state_lock);
175 while (tiqn->tiqn_access_count != 0) {
176 spin_unlock(&tiqn->tiqn_state_lock);
177 msleep(10);
178 spin_lock(&tiqn->tiqn_state_lock);
179 }
180 spin_unlock(&tiqn->tiqn_state_lock);
181 }
182
183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
184 {
185 /*
186 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
187 * while holding tiqn->tiqn_state_lock. This means that all subsequent
188 * attempts to access this struct iscsi_tiqn will fail from both transport
189 * fabric and control code paths.
190 */
191 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
192 pr_err("iscsit_set_tiqn_shutdown() failed\n");
193 return;
194 }
195
196 iscsit_wait_for_tiqn(tiqn);
197
198 spin_lock(&tiqn_lock);
199 list_del(&tiqn->tiqn_list);
200 idr_remove(&tiqn_idr, tiqn->tiqn_index);
201 spin_unlock(&tiqn_lock);
202
203 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
204 tiqn->tiqn);
205 kfree(tiqn);
206 }
207
208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
209 {
210 int ret;
211 /*
212 * Determine if the network portal is accepting storage traffic.
213 */
214 spin_lock_bh(&np->np_thread_lock);
215 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
216 spin_unlock_bh(&np->np_thread_lock);
217 return -1;
218 }
219 spin_unlock_bh(&np->np_thread_lock);
220 /*
221 * Determine if the portal group is accepting storage traffic.
222 */
223 spin_lock_bh(&tpg->tpg_state_lock);
224 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
225 spin_unlock_bh(&tpg->tpg_state_lock);
226 return -1;
227 }
228 spin_unlock_bh(&tpg->tpg_state_lock);
229
230 /*
231 * Here we serialize access across the TIQN+TPG Tuple.
232 */
233 ret = down_interruptible(&tpg->np_login_sem);
234 if (ret != 0)
235 return -1;
236
237 spin_lock_bh(&tpg->tpg_state_lock);
238 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
239 spin_unlock_bh(&tpg->tpg_state_lock);
240 up(&tpg->np_login_sem);
241 return -1;
242 }
243 spin_unlock_bh(&tpg->tpg_state_lock);
244
245 return 0;
246 }
247
248 void iscsit_login_kref_put(struct kref *kref)
249 {
250 struct iscsi_tpg_np *tpg_np = container_of(kref,
251 struct iscsi_tpg_np, tpg_np_kref);
252
253 complete(&tpg_np->tpg_np_comp);
254 }
255
256 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
257 struct iscsi_tpg_np *tpg_np)
258 {
259 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
260
261 up(&tpg->np_login_sem);
262
263 if (tpg_np)
264 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
265
266 if (tiqn)
267 iscsit_put_tiqn_for_login(tiqn);
268
269 return 0;
270 }
271
272 bool iscsit_check_np_match(
273 struct __kernel_sockaddr_storage *sockaddr,
274 struct iscsi_np *np,
275 int network_transport)
276 {
277 struct sockaddr_in *sock_in, *sock_in_e;
278 struct sockaddr_in6 *sock_in6, *sock_in6_e;
279 bool ip_match = false;
280 u16 port;
281
282 if (sockaddr->ss_family == AF_INET6) {
283 sock_in6 = (struct sockaddr_in6 *)sockaddr;
284 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
285
286 if (!memcmp(&sock_in6->sin6_addr.in6_u,
287 &sock_in6_e->sin6_addr.in6_u,
288 sizeof(struct in6_addr)))
289 ip_match = true;
290
291 port = ntohs(sock_in6->sin6_port);
292 } else {
293 sock_in = (struct sockaddr_in *)sockaddr;
294 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
295
296 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
297 ip_match = true;
298
299 port = ntohs(sock_in->sin_port);
300 }
301
302 if (ip_match && (np->np_port == port) &&
303 (np->np_network_transport == network_transport))
304 return true;
305
306 return false;
307 }
308
309 /*
310 * Called with mutex np_lock held
311 */
312 static struct iscsi_np *iscsit_get_np(
313 struct __kernel_sockaddr_storage *sockaddr,
314 int network_transport)
315 {
316 struct iscsi_np *np;
317 bool match;
318
319 list_for_each_entry(np, &g_np_list, np_list) {
320 spin_lock_bh(&np->np_thread_lock);
321 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
322 spin_unlock_bh(&np->np_thread_lock);
323 continue;
324 }
325
326 match = iscsit_check_np_match(sockaddr, np, network_transport);
327 if (match) {
328 /*
329 * Increment the np_exports reference count now to
330 * prevent iscsit_del_np() below from being called
331 * while iscsi_tpg_add_network_portal() is called.
332 */
333 np->np_exports++;
334 spin_unlock_bh(&np->np_thread_lock);
335 return np;
336 }
337 spin_unlock_bh(&np->np_thread_lock);
338 }
339
340 return NULL;
341 }
342
343 struct iscsi_np *iscsit_add_np(
344 struct __kernel_sockaddr_storage *sockaddr,
345 char *ip_str,
346 int network_transport)
347 {
348 struct sockaddr_in *sock_in;
349 struct sockaddr_in6 *sock_in6;
350 struct iscsi_np *np;
351 int ret;
352
353 mutex_lock(&np_lock);
354
355 /*
356 * Locate the existing struct iscsi_np if already active..
357 */
358 np = iscsit_get_np(sockaddr, network_transport);
359 if (np) {
360 mutex_unlock(&np_lock);
361 return np;
362 }
363
364 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
365 if (!np) {
366 pr_err("Unable to allocate memory for struct iscsi_np\n");
367 mutex_unlock(&np_lock);
368 return ERR_PTR(-ENOMEM);
369 }
370
371 np->np_flags |= NPF_IP_NETWORK;
372 if (sockaddr->ss_family == AF_INET6) {
373 sock_in6 = (struct sockaddr_in6 *)sockaddr;
374 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
375 np->np_port = ntohs(sock_in6->sin6_port);
376 } else {
377 sock_in = (struct sockaddr_in *)sockaddr;
378 sprintf(np->np_ip, "%s", ip_str);
379 np->np_port = ntohs(sock_in->sin_port);
380 }
381
382 np->np_network_transport = network_transport;
383 spin_lock_init(&np->np_thread_lock);
384 init_completion(&np->np_restart_comp);
385 INIT_LIST_HEAD(&np->np_list);
386
387 ret = iscsi_target_setup_login_socket(np, sockaddr);
388 if (ret != 0) {
389 kfree(np);
390 mutex_unlock(&np_lock);
391 return ERR_PTR(ret);
392 }
393
394 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
395 if (IS_ERR(np->np_thread)) {
396 pr_err("Unable to create kthread: iscsi_np\n");
397 ret = PTR_ERR(np->np_thread);
398 kfree(np);
399 mutex_unlock(&np_lock);
400 return ERR_PTR(ret);
401 }
402 /*
403 * Increment the np_exports reference count now to prevent
404 * iscsit_del_np() below from being run while a new call to
405 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
406 * active. We don't need to hold np->np_thread_lock at this
407 * point because iscsi_np has not been added to g_np_list yet.
408 */
409 np->np_exports = 1;
410 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
411
412 list_add_tail(&np->np_list, &g_np_list);
413 mutex_unlock(&np_lock);
414
415 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
416 np->np_ip, np->np_port, np->np_transport->name);
417
418 return np;
419 }
420
421 int iscsit_reset_np_thread(
422 struct iscsi_np *np,
423 struct iscsi_tpg_np *tpg_np,
424 struct iscsi_portal_group *tpg,
425 bool shutdown)
426 {
427 spin_lock_bh(&np->np_thread_lock);
428 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
429 spin_unlock_bh(&np->np_thread_lock);
430 return 0;
431 }
432 np->np_thread_state = ISCSI_NP_THREAD_RESET;
433
434 if (np->np_thread) {
435 spin_unlock_bh(&np->np_thread_lock);
436 send_sig(SIGINT, np->np_thread, 1);
437 wait_for_completion(&np->np_restart_comp);
438 spin_lock_bh(&np->np_thread_lock);
439 }
440 spin_unlock_bh(&np->np_thread_lock);
441
442 if (tpg_np && shutdown) {
443 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
444
445 wait_for_completion(&tpg_np->tpg_np_comp);
446 }
447
448 return 0;
449 }
450
451 static void iscsit_free_np(struct iscsi_np *np)
452 {
453 if (np->np_socket)
454 sock_release(np->np_socket);
455 }
456
457 int iscsit_del_np(struct iscsi_np *np)
458 {
459 spin_lock_bh(&np->np_thread_lock);
460 np->np_exports--;
461 if (np->np_exports) {
462 np->enabled = true;
463 spin_unlock_bh(&np->np_thread_lock);
464 return 0;
465 }
466 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
467 spin_unlock_bh(&np->np_thread_lock);
468
469 if (np->np_thread) {
470 /*
471 * We need to send the signal to wakeup Linux/Net
472 * which may be sleeping in sock_accept()..
473 */
474 send_sig(SIGINT, np->np_thread, 1);
475 kthread_stop(np->np_thread);
476 np->np_thread = NULL;
477 }
478
479 np->np_transport->iscsit_free_np(np);
480
481 mutex_lock(&np_lock);
482 list_del(&np->np_list);
483 mutex_unlock(&np_lock);
484
485 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
486 np->np_ip, np->np_port, np->np_transport->name);
487
488 iscsit_put_transport(np->np_transport);
489 kfree(np);
490 return 0;
491 }
492
493 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
494 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
495
496 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
497 {
498 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
499 return 0;
500 }
501
502 static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
503 {
504 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
505
506 spin_lock_bh(&conn->cmd_lock);
507 if (!list_empty(&cmd->i_conn_node))
508 list_del_init(&cmd->i_conn_node);
509 spin_unlock_bh(&conn->cmd_lock);
510
511 __iscsit_free_cmd(cmd, scsi_cmd, true);
512 }
513
514 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
515 {
516 return TARGET_PROT_NORMAL;
517 }
518
519 static struct iscsit_transport iscsi_target_transport = {
520 .name = "iSCSI/TCP",
521 .transport_type = ISCSI_TCP,
522 .owner = NULL,
523 .iscsit_setup_np = iscsit_setup_np,
524 .iscsit_accept_np = iscsit_accept_np,
525 .iscsit_free_np = iscsit_free_np,
526 .iscsit_get_login_rx = iscsit_get_login_rx,
527 .iscsit_put_login_tx = iscsit_put_login_tx,
528 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
529 .iscsit_immediate_queue = iscsit_immediate_queue,
530 .iscsit_response_queue = iscsit_response_queue,
531 .iscsit_queue_data_in = iscsit_queue_rsp,
532 .iscsit_queue_status = iscsit_queue_rsp,
533 .iscsit_aborted_task = iscsit_aborted_task,
534 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
535 };
536
537 static int __init iscsi_target_init_module(void)
538 {
539 int ret = 0, size;
540
541 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
542
543 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
544 if (!iscsit_global) {
545 pr_err("Unable to allocate memory for iscsit_global\n");
546 return -1;
547 }
548 spin_lock_init(&iscsit_global->ts_bitmap_lock);
549 mutex_init(&auth_id_lock);
550 spin_lock_init(&sess_idr_lock);
551 idr_init(&tiqn_idr);
552 idr_init(&sess_idr);
553
554 ret = target_register_template(&iscsi_ops);
555 if (ret)
556 goto out;
557
558 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
559 iscsit_global->ts_bitmap = vzalloc(size);
560 if (!iscsit_global->ts_bitmap) {
561 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
562 goto configfs_out;
563 }
564
565 lio_qr_cache = kmem_cache_create("lio_qr_cache",
566 sizeof(struct iscsi_queue_req),
567 __alignof__(struct iscsi_queue_req), 0, NULL);
568 if (!lio_qr_cache) {
569 pr_err("nable to kmem_cache_create() for"
570 " lio_qr_cache\n");
571 goto bitmap_out;
572 }
573
574 lio_dr_cache = kmem_cache_create("lio_dr_cache",
575 sizeof(struct iscsi_datain_req),
576 __alignof__(struct iscsi_datain_req), 0, NULL);
577 if (!lio_dr_cache) {
578 pr_err("Unable to kmem_cache_create() for"
579 " lio_dr_cache\n");
580 goto qr_out;
581 }
582
583 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
584 sizeof(struct iscsi_ooo_cmdsn),
585 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
586 if (!lio_ooo_cache) {
587 pr_err("Unable to kmem_cache_create() for"
588 " lio_ooo_cache\n");
589 goto dr_out;
590 }
591
592 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
593 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
594 0, NULL);
595 if (!lio_r2t_cache) {
596 pr_err("Unable to kmem_cache_create() for"
597 " lio_r2t_cache\n");
598 goto ooo_out;
599 }
600
601 iscsit_register_transport(&iscsi_target_transport);
602
603 if (iscsit_load_discovery_tpg() < 0)
604 goto r2t_out;
605
606 return ret;
607 r2t_out:
608 iscsit_unregister_transport(&iscsi_target_transport);
609 kmem_cache_destroy(lio_r2t_cache);
610 ooo_out:
611 kmem_cache_destroy(lio_ooo_cache);
612 dr_out:
613 kmem_cache_destroy(lio_dr_cache);
614 qr_out:
615 kmem_cache_destroy(lio_qr_cache);
616 bitmap_out:
617 vfree(iscsit_global->ts_bitmap);
618 configfs_out:
619 /* XXX: this probably wants it to be it's own unwind step.. */
620 if (iscsit_global->discovery_tpg)
621 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
622 target_unregister_template(&iscsi_ops);
623 out:
624 kfree(iscsit_global);
625 return -ENOMEM;
626 }
627
628 static void __exit iscsi_target_cleanup_module(void)
629 {
630 iscsit_release_discovery_tpg();
631 iscsit_unregister_transport(&iscsi_target_transport);
632 kmem_cache_destroy(lio_qr_cache);
633 kmem_cache_destroy(lio_dr_cache);
634 kmem_cache_destroy(lio_ooo_cache);
635 kmem_cache_destroy(lio_r2t_cache);
636
637 /*
638 * Shutdown discovery sessions and disable discovery TPG
639 */
640 if (iscsit_global->discovery_tpg)
641 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
642
643 target_unregister_template(&iscsi_ops);
644
645 vfree(iscsit_global->ts_bitmap);
646 kfree(iscsit_global);
647 }
648
649 static int iscsit_add_reject(
650 struct iscsi_conn *conn,
651 u8 reason,
652 unsigned char *buf)
653 {
654 struct iscsi_cmd *cmd;
655
656 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
657 if (!cmd)
658 return -1;
659
660 cmd->iscsi_opcode = ISCSI_OP_REJECT;
661 cmd->reject_reason = reason;
662
663 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
664 if (!cmd->buf_ptr) {
665 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
666 iscsit_free_cmd(cmd, false);
667 return -1;
668 }
669
670 spin_lock_bh(&conn->cmd_lock);
671 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
672 spin_unlock_bh(&conn->cmd_lock);
673
674 cmd->i_state = ISTATE_SEND_REJECT;
675 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
676
677 return -1;
678 }
679
680 static int iscsit_add_reject_from_cmd(
681 struct iscsi_cmd *cmd,
682 u8 reason,
683 bool add_to_conn,
684 unsigned char *buf)
685 {
686 struct iscsi_conn *conn;
687
688 if (!cmd->conn) {
689 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
690 cmd->init_task_tag);
691 return -1;
692 }
693 conn = cmd->conn;
694
695 cmd->iscsi_opcode = ISCSI_OP_REJECT;
696 cmd->reject_reason = reason;
697
698 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
699 if (!cmd->buf_ptr) {
700 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
701 iscsit_free_cmd(cmd, false);
702 return -1;
703 }
704
705 if (add_to_conn) {
706 spin_lock_bh(&conn->cmd_lock);
707 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
708 spin_unlock_bh(&conn->cmd_lock);
709 }
710
711 cmd->i_state = ISTATE_SEND_REJECT;
712 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
713 /*
714 * Perform the kref_put now if se_cmd has already been setup by
715 * scsit_setup_scsi_cmd()
716 */
717 if (cmd->se_cmd.se_tfo != NULL) {
718 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
719 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
720 }
721 return -1;
722 }
723
724 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
725 unsigned char *buf)
726 {
727 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
728 }
729
730 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
731 {
732 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
733 }
734
735 /*
736 * Map some portion of the allocated scatterlist to an iovec, suitable for
737 * kernel sockets to copy data in/out.
738 */
739 static int iscsit_map_iovec(
740 struct iscsi_cmd *cmd,
741 struct kvec *iov,
742 u32 data_offset,
743 u32 data_length)
744 {
745 u32 i = 0;
746 struct scatterlist *sg;
747 unsigned int page_off;
748
749 /*
750 * We know each entry in t_data_sg contains a page.
751 */
752 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
753 page_off = (data_offset % PAGE_SIZE);
754
755 cmd->first_data_sg = sg;
756 cmd->first_data_sg_off = page_off;
757
758 while (data_length) {
759 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
760
761 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
762 iov[i].iov_len = cur_len;
763
764 data_length -= cur_len;
765 page_off = 0;
766 sg = sg_next(sg);
767 i++;
768 }
769
770 cmd->kmapped_nents = i;
771
772 return i;
773 }
774
775 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
776 {
777 u32 i;
778 struct scatterlist *sg;
779
780 sg = cmd->first_data_sg;
781
782 for (i = 0; i < cmd->kmapped_nents; i++)
783 kunmap(sg_page(&sg[i]));
784 }
785
786 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
787 {
788 LIST_HEAD(ack_list);
789 struct iscsi_cmd *cmd, *cmd_p;
790
791 conn->exp_statsn = exp_statsn;
792
793 if (conn->sess->sess_ops->RDMAExtensions)
794 return;
795
796 spin_lock_bh(&conn->cmd_lock);
797 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
798 spin_lock(&cmd->istate_lock);
799 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
800 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
801 cmd->i_state = ISTATE_REMOVE;
802 spin_unlock(&cmd->istate_lock);
803 list_move_tail(&cmd->i_conn_node, &ack_list);
804 continue;
805 }
806 spin_unlock(&cmd->istate_lock);
807 }
808 spin_unlock_bh(&conn->cmd_lock);
809
810 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
811 list_del_init(&cmd->i_conn_node);
812 iscsit_free_cmd(cmd, false);
813 }
814 }
815
816 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
817 {
818 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
819
820 iov_count += ISCSI_IOV_DATA_BUFFER;
821
822 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
823 if (!cmd->iov_data) {
824 pr_err("Unable to allocate cmd->iov_data\n");
825 return -ENOMEM;
826 }
827
828 cmd->orig_iov_data_count = iov_count;
829 return 0;
830 }
831
832 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
833 unsigned char *buf)
834 {
835 int data_direction, payload_length;
836 struct iscsi_scsi_req *hdr;
837 int iscsi_task_attr;
838 int sam_task_attr;
839
840 atomic_long_inc(&conn->sess->cmd_pdus);
841
842 hdr = (struct iscsi_scsi_req *) buf;
843 payload_length = ntoh24(hdr->dlength);
844
845 /* FIXME; Add checks for AdditionalHeaderSegment */
846
847 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
848 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
849 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
850 " not set. Bad iSCSI Initiator.\n");
851 return iscsit_add_reject_cmd(cmd,
852 ISCSI_REASON_BOOKMARK_INVALID, buf);
853 }
854
855 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
856 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
857 /*
858 * From RFC-3720 Section 10.3.1:
859 *
860 * "Either or both of R and W MAY be 1 when either the
861 * Expected Data Transfer Length and/or Bidirectional Read
862 * Expected Data Transfer Length are 0"
863 *
864 * For this case, go ahead and clear the unnecssary bits
865 * to avoid any confusion with ->data_direction.
866 */
867 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
868 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
869
870 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
871 " set when Expected Data Transfer Length is 0 for"
872 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
873 }
874
875 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
876 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
877 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
878 " MUST be set if Expected Data Transfer Length is not 0."
879 " Bad iSCSI Initiator\n");
880 return iscsit_add_reject_cmd(cmd,
881 ISCSI_REASON_BOOKMARK_INVALID, buf);
882 }
883
884 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
885 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
886 pr_err("Bidirectional operations not supported!\n");
887 return iscsit_add_reject_cmd(cmd,
888 ISCSI_REASON_BOOKMARK_INVALID, buf);
889 }
890
891 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
892 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
893 " Scsi Command PDU.\n");
894 return iscsit_add_reject_cmd(cmd,
895 ISCSI_REASON_BOOKMARK_INVALID, buf);
896 }
897
898 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
899 pr_err("ImmediateData=No but DataSegmentLength=%u,"
900 " protocol error.\n", payload_length);
901 return iscsit_add_reject_cmd(cmd,
902 ISCSI_REASON_PROTOCOL_ERROR, buf);
903 }
904
905 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
906 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
907 pr_err("Expected Data Transfer Length and Length of"
908 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
909 " bit is not set protocol error\n");
910 return iscsit_add_reject_cmd(cmd,
911 ISCSI_REASON_PROTOCOL_ERROR, buf);
912 }
913
914 if (payload_length > be32_to_cpu(hdr->data_length)) {
915 pr_err("DataSegmentLength: %u is greater than"
916 " EDTL: %u, protocol error.\n", payload_length,
917 hdr->data_length);
918 return iscsit_add_reject_cmd(cmd,
919 ISCSI_REASON_PROTOCOL_ERROR, buf);
920 }
921
922 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
923 pr_err("DataSegmentLength: %u is greater than"
924 " MaxXmitDataSegmentLength: %u, protocol error.\n",
925 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
926 return iscsit_add_reject_cmd(cmd,
927 ISCSI_REASON_PROTOCOL_ERROR, buf);
928 }
929
930 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
931 pr_err("DataSegmentLength: %u is greater than"
932 " FirstBurstLength: %u, protocol error.\n",
933 payload_length, conn->sess->sess_ops->FirstBurstLength);
934 return iscsit_add_reject_cmd(cmd,
935 ISCSI_REASON_BOOKMARK_INVALID, buf);
936 }
937
938 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
939 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
940 DMA_NONE;
941
942 cmd->data_direction = data_direction;
943 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
944 /*
945 * Figure out the SAM Task Attribute for the incoming SCSI CDB
946 */
947 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
948 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
949 sam_task_attr = TCM_SIMPLE_TAG;
950 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
951 sam_task_attr = TCM_ORDERED_TAG;
952 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
953 sam_task_attr = TCM_HEAD_TAG;
954 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
955 sam_task_attr = TCM_ACA_TAG;
956 else {
957 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
958 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
959 sam_task_attr = TCM_SIMPLE_TAG;
960 }
961
962 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
963 cmd->i_state = ISTATE_NEW_CMD;
964 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
965 cmd->immediate_data = (payload_length) ? 1 : 0;
966 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
967 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
968 if (cmd->unsolicited_data)
969 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
970
971 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
972 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
973 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
974 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
975 cmd->targ_xfer_tag = 0xFFFFFFFF;
976 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
977 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
978 cmd->first_burst_len = payload_length;
979
980 if (!conn->sess->sess_ops->RDMAExtensions &&
981 cmd->data_direction == DMA_FROM_DEVICE) {
982 struct iscsi_datain_req *dr;
983
984 dr = iscsit_allocate_datain_req();
985 if (!dr)
986 return iscsit_add_reject_cmd(cmd,
987 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
988
989 iscsit_attach_datain_req(cmd, dr);
990 }
991
992 /*
993 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
994 */
995 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
996 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
997 cmd->data_direction, sam_task_attr,
998 cmd->sense_buffer + 2);
999
1000 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1001 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1002 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1003 conn->cid);
1004
1005 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1006
1007 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1008 scsilun_to_int(&hdr->lun));
1009 if (cmd->sense_reason)
1010 goto attach_cmd;
1011
1012 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1013 if (cmd->sense_reason) {
1014 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1015 return iscsit_add_reject_cmd(cmd,
1016 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1017 }
1018
1019 goto attach_cmd;
1020 }
1021
1022 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1023 return iscsit_add_reject_cmd(cmd,
1024 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1025 }
1026
1027 attach_cmd:
1028 spin_lock_bh(&conn->cmd_lock);
1029 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1030 spin_unlock_bh(&conn->cmd_lock);
1031 /*
1032 * Check if we need to delay processing because of ALUA
1033 * Active/NonOptimized primary access state..
1034 */
1035 core_alua_check_nonop_delay(&cmd->se_cmd);
1036
1037 return 0;
1038 }
1039 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1040
1041 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1042 {
1043 iscsit_set_dataout_sequence_values(cmd);
1044
1045 spin_lock_bh(&cmd->dataout_timeout_lock);
1046 iscsit_start_dataout_timer(cmd, cmd->conn);
1047 spin_unlock_bh(&cmd->dataout_timeout_lock);
1048 }
1049 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1050
1051 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1052 struct iscsi_scsi_req *hdr)
1053 {
1054 int cmdsn_ret = 0;
1055 /*
1056 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1057 * the Immediate Bit is not set, and no Immediate
1058 * Data is attached.
1059 *
1060 * A PDU/CmdSN carrying Immediate Data can only
1061 * be processed after the DataCRC has passed.
1062 * If the DataCRC fails, the CmdSN MUST NOT
1063 * be acknowledged. (See below)
1064 */
1065 if (!cmd->immediate_data) {
1066 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1067 (unsigned char *)hdr, hdr->cmdsn);
1068 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1069 return -1;
1070 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1071 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1072 return 0;
1073 }
1074 }
1075
1076 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1077
1078 /*
1079 * If no Immediate Data is attached, it's OK to return now.
1080 */
1081 if (!cmd->immediate_data) {
1082 if (!cmd->sense_reason && cmd->unsolicited_data)
1083 iscsit_set_unsoliticed_dataout(cmd);
1084 if (!cmd->sense_reason)
1085 return 0;
1086
1087 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1088 return 0;
1089 }
1090
1091 /*
1092 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1093 * execution. These exceptions are processed in CmdSN order using
1094 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1095 */
1096 if (cmd->sense_reason) {
1097 if (cmd->reject_reason)
1098 return 0;
1099
1100 return 1;
1101 }
1102 /*
1103 * Call directly into transport_generic_new_cmd() to perform
1104 * the backend memory allocation.
1105 */
1106 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1107 if (cmd->sense_reason)
1108 return 1;
1109
1110 return 0;
1111 }
1112 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1113
1114 static int
1115 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1116 bool dump_payload)
1117 {
1118 struct iscsi_conn *conn = cmd->conn;
1119 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1120 /*
1121 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1122 */
1123 if (dump_payload)
1124 goto after_immediate_data;
1125
1126 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1127 cmd->first_burst_len);
1128 after_immediate_data:
1129 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1130 /*
1131 * A PDU/CmdSN carrying Immediate Data passed
1132 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1133 * Immediate Bit is not set.
1134 */
1135 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1136 (unsigned char *)hdr, hdr->cmdsn);
1137 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1138 return -1;
1139
1140 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1141 int rc;
1142
1143 rc = iscsit_dump_data_payload(cmd->conn,
1144 cmd->first_burst_len, 1);
1145 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1146 return rc;
1147 } else if (cmd->unsolicited_data)
1148 iscsit_set_unsoliticed_dataout(cmd);
1149
1150 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1151 /*
1152 * Immediate Data failed DataCRC and ERL>=1,
1153 * silently drop this PDU and let the initiator
1154 * plug the CmdSN gap.
1155 *
1156 * FIXME: Send Unsolicited NOPIN with reserved
1157 * TTT here to help the initiator figure out
1158 * the missing CmdSN, although they should be
1159 * intelligent enough to determine the missing
1160 * CmdSN and issue a retry to plug the sequence.
1161 */
1162 cmd->i_state = ISTATE_REMOVE;
1163 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1164 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1165 return -1;
1166
1167 return 0;
1168 }
1169
1170 static int
1171 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1172 unsigned char *buf)
1173 {
1174 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1175 int rc, immed_data;
1176 bool dump_payload = false;
1177
1178 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1179 if (rc < 0)
1180 return 0;
1181 /*
1182 * Allocation iovecs needed for struct socket operations for
1183 * traditional iSCSI block I/O.
1184 */
1185 if (iscsit_allocate_iovecs(cmd) < 0) {
1186 return iscsit_reject_cmd(cmd,
1187 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1188 }
1189 immed_data = cmd->immediate_data;
1190
1191 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1192 if (rc < 0)
1193 return rc;
1194 else if (rc > 0)
1195 dump_payload = true;
1196
1197 if (!immed_data)
1198 return 0;
1199
1200 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1201 }
1202
1203 static u32 iscsit_do_crypto_hash_sg(
1204 struct hash_desc *hash,
1205 struct iscsi_cmd *cmd,
1206 u32 data_offset,
1207 u32 data_length,
1208 u32 padding,
1209 u8 *pad_bytes)
1210 {
1211 u32 data_crc;
1212 u32 i;
1213 struct scatterlist *sg;
1214 unsigned int page_off;
1215
1216 crypto_hash_init(hash);
1217
1218 sg = cmd->first_data_sg;
1219 page_off = cmd->first_data_sg_off;
1220
1221 i = 0;
1222 while (data_length) {
1223 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1224
1225 crypto_hash_update(hash, &sg[i], cur_len);
1226
1227 data_length -= cur_len;
1228 page_off = 0;
1229 i++;
1230 }
1231
1232 if (padding) {
1233 struct scatterlist pad_sg;
1234
1235 sg_init_one(&pad_sg, pad_bytes, padding);
1236 crypto_hash_update(hash, &pad_sg, padding);
1237 }
1238 crypto_hash_final(hash, (u8 *) &data_crc);
1239
1240 return data_crc;
1241 }
1242
1243 static void iscsit_do_crypto_hash_buf(
1244 struct hash_desc *hash,
1245 const void *buf,
1246 u32 payload_length,
1247 u32 padding,
1248 u8 *pad_bytes,
1249 u8 *data_crc)
1250 {
1251 struct scatterlist sg;
1252
1253 crypto_hash_init(hash);
1254
1255 sg_init_one(&sg, buf, payload_length);
1256 crypto_hash_update(hash, &sg, payload_length);
1257
1258 if (padding) {
1259 sg_init_one(&sg, pad_bytes, padding);
1260 crypto_hash_update(hash, &sg, padding);
1261 }
1262 crypto_hash_final(hash, data_crc);
1263 }
1264
1265 int
1266 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1267 struct iscsi_cmd **out_cmd)
1268 {
1269 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1270 struct iscsi_cmd *cmd = NULL;
1271 struct se_cmd *se_cmd;
1272 u32 payload_length = ntoh24(hdr->dlength);
1273 int rc;
1274
1275 if (!payload_length) {
1276 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1277 return 0;
1278 }
1279
1280 /* iSCSI write */
1281 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1282
1283 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1284 pr_err("DataSegmentLength: %u is greater than"
1285 " MaxXmitDataSegmentLength: %u\n", payload_length,
1286 conn->conn_ops->MaxXmitDataSegmentLength);
1287 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1288 buf);
1289 }
1290
1291 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1292 payload_length);
1293 if (!cmd)
1294 return 0;
1295
1296 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1297 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1298 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1299 payload_length, conn->cid);
1300
1301 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1302 pr_err("Command ITT: 0x%08x received DataOUT after"
1303 " last DataOUT received, dumping payload\n",
1304 cmd->init_task_tag);
1305 return iscsit_dump_data_payload(conn, payload_length, 1);
1306 }
1307
1308 if (cmd->data_direction != DMA_TO_DEVICE) {
1309 pr_err("Command ITT: 0x%08x received DataOUT for a"
1310 " NON-WRITE command.\n", cmd->init_task_tag);
1311 return iscsit_dump_data_payload(conn, payload_length, 1);
1312 }
1313 se_cmd = &cmd->se_cmd;
1314 iscsit_mod_dataout_timer(cmd);
1315
1316 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1317 pr_err("DataOut Offset: %u, Length %u greater than"
1318 " iSCSI Command EDTL %u, protocol error.\n",
1319 hdr->offset, payload_length, cmd->se_cmd.data_length);
1320 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1321 }
1322
1323 if (cmd->unsolicited_data) {
1324 int dump_unsolicited_data = 0;
1325
1326 if (conn->sess->sess_ops->InitialR2T) {
1327 pr_err("Received unexpected unsolicited data"
1328 " while InitialR2T=Yes, protocol error.\n");
1329 transport_send_check_condition_and_sense(&cmd->se_cmd,
1330 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1331 return -1;
1332 }
1333 /*
1334 * Special case for dealing with Unsolicited DataOUT
1335 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1336 * failures;
1337 */
1338
1339 /* Something's amiss if we're not in WRITE_PENDING state... */
1340 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1341 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1342 dump_unsolicited_data = 1;
1343
1344 if (dump_unsolicited_data) {
1345 /*
1346 * Check if a delayed TASK_ABORTED status needs to
1347 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1348 * received with the unsolicitied data out.
1349 */
1350 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1351 iscsit_stop_dataout_timer(cmd);
1352
1353 transport_check_aborted_status(se_cmd,
1354 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1355 return iscsit_dump_data_payload(conn, payload_length, 1);
1356 }
1357 } else {
1358 /*
1359 * For the normal solicited data path:
1360 *
1361 * Check for a delayed TASK_ABORTED status and dump any
1362 * incoming data out payload if one exists. Also, when the
1363 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1364 * data out sequence, we decrement outstanding_r2ts. Once
1365 * outstanding_r2ts reaches zero, go ahead and send the delayed
1366 * TASK_ABORTED status.
1367 */
1368 if (se_cmd->transport_state & CMD_T_ABORTED) {
1369 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1370 if (--cmd->outstanding_r2ts < 1) {
1371 iscsit_stop_dataout_timer(cmd);
1372 transport_check_aborted_status(
1373 se_cmd, 1);
1374 }
1375
1376 return iscsit_dump_data_payload(conn, payload_length, 1);
1377 }
1378 }
1379 /*
1380 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1381 * within-command recovery checks before receiving the payload.
1382 */
1383 rc = iscsit_check_pre_dataout(cmd, buf);
1384 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1385 return 0;
1386 else if (rc == DATAOUT_CANNOT_RECOVER)
1387 return -1;
1388
1389 *out_cmd = cmd;
1390 return 0;
1391 }
1392 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1393
1394 static int
1395 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1396 struct iscsi_data *hdr)
1397 {
1398 struct kvec *iov;
1399 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1400 u32 payload_length = ntoh24(hdr->dlength);
1401 int iov_ret, data_crc_failed = 0;
1402
1403 rx_size += payload_length;
1404 iov = &cmd->iov_data[0];
1405
1406 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1407 payload_length);
1408 if (iov_ret < 0)
1409 return -1;
1410
1411 iov_count += iov_ret;
1412
1413 padding = ((-payload_length) & 3);
1414 if (padding != 0) {
1415 iov[iov_count].iov_base = cmd->pad_bytes;
1416 iov[iov_count++].iov_len = padding;
1417 rx_size += padding;
1418 pr_debug("Receiving %u padding bytes.\n", padding);
1419 }
1420
1421 if (conn->conn_ops->DataDigest) {
1422 iov[iov_count].iov_base = &checksum;
1423 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1424 rx_size += ISCSI_CRC_LEN;
1425 }
1426
1427 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1428
1429 iscsit_unmap_iovec(cmd);
1430
1431 if (rx_got != rx_size)
1432 return -1;
1433
1434 if (conn->conn_ops->DataDigest) {
1435 u32 data_crc;
1436
1437 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1438 be32_to_cpu(hdr->offset),
1439 payload_length, padding,
1440 cmd->pad_bytes);
1441
1442 if (checksum != data_crc) {
1443 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1444 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1445 " does not match computed 0x%08x\n",
1446 hdr->itt, hdr->offset, payload_length,
1447 hdr->datasn, checksum, data_crc);
1448 data_crc_failed = 1;
1449 } else {
1450 pr_debug("Got CRC32C DataDigest 0x%08x for"
1451 " %u bytes of Data Out\n", checksum,
1452 payload_length);
1453 }
1454 }
1455
1456 return data_crc_failed;
1457 }
1458
1459 int
1460 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1461 bool data_crc_failed)
1462 {
1463 struct iscsi_conn *conn = cmd->conn;
1464 int rc, ooo_cmdsn;
1465 /*
1466 * Increment post receive data and CRC values or perform
1467 * within-command recovery.
1468 */
1469 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1470 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1471 return 0;
1472 else if (rc == DATAOUT_SEND_R2T) {
1473 iscsit_set_dataout_sequence_values(cmd);
1474 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1475 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1476 /*
1477 * Handle extra special case for out of order
1478 * Unsolicited Data Out.
1479 */
1480 spin_lock_bh(&cmd->istate_lock);
1481 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1482 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1483 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1484 spin_unlock_bh(&cmd->istate_lock);
1485
1486 iscsit_stop_dataout_timer(cmd);
1487 if (ooo_cmdsn)
1488 return 0;
1489 target_execute_cmd(&cmd->se_cmd);
1490 return 0;
1491 } else /* DATAOUT_CANNOT_RECOVER */
1492 return -1;
1493
1494 return 0;
1495 }
1496 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1497
1498 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1499 {
1500 struct iscsi_cmd *cmd = NULL;
1501 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1502 int rc;
1503 bool data_crc_failed = false;
1504
1505 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1506 if (rc < 0)
1507 return 0;
1508 else if (!cmd)
1509 return 0;
1510
1511 rc = iscsit_get_dataout(conn, cmd, hdr);
1512 if (rc < 0)
1513 return rc;
1514 else if (rc > 0)
1515 data_crc_failed = true;
1516
1517 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1518 }
1519
1520 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1521 struct iscsi_nopout *hdr)
1522 {
1523 u32 payload_length = ntoh24(hdr->dlength);
1524
1525 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1526 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1527 if (!cmd)
1528 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1529 (unsigned char *)hdr);
1530
1531 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1532 (unsigned char *)hdr);
1533 }
1534
1535 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1536 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1537 " not set, protocol error.\n");
1538 if (!cmd)
1539 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1540 (unsigned char *)hdr);
1541
1542 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1543 (unsigned char *)hdr);
1544 }
1545
1546 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1547 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1548 " greater than MaxXmitDataSegmentLength: %u, protocol"
1549 " error.\n", payload_length,
1550 conn->conn_ops->MaxXmitDataSegmentLength);
1551 if (!cmd)
1552 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1553 (unsigned char *)hdr);
1554
1555 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1556 (unsigned char *)hdr);
1557 }
1558
1559 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1560 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1561 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1562 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1563 payload_length);
1564 /*
1565 * This is not a response to a Unsolicited NopIN, which means
1566 * it can either be a NOPOUT ping request (with a valid ITT),
1567 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1568 * Either way, make sure we allocate an struct iscsi_cmd, as both
1569 * can contain ping data.
1570 */
1571 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1572 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1573 cmd->i_state = ISTATE_SEND_NOPIN;
1574 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1575 1 : 0);
1576 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1577 cmd->targ_xfer_tag = 0xFFFFFFFF;
1578 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1579 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1580 cmd->data_direction = DMA_NONE;
1581 }
1582
1583 return 0;
1584 }
1585 EXPORT_SYMBOL(iscsit_setup_nop_out);
1586
1587 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1588 struct iscsi_nopout *hdr)
1589 {
1590 struct iscsi_cmd *cmd_p = NULL;
1591 int cmdsn_ret = 0;
1592 /*
1593 * Initiator is expecting a NopIN ping reply..
1594 */
1595 if (hdr->itt != RESERVED_ITT) {
1596 if (!cmd)
1597 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1598 (unsigned char *)hdr);
1599
1600 spin_lock_bh(&conn->cmd_lock);
1601 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1602 spin_unlock_bh(&conn->cmd_lock);
1603
1604 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1605
1606 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1607 iscsit_add_cmd_to_response_queue(cmd, conn,
1608 cmd->i_state);
1609 return 0;
1610 }
1611
1612 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1613 (unsigned char *)hdr, hdr->cmdsn);
1614 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1615 return 0;
1616 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1617 return -1;
1618
1619 return 0;
1620 }
1621 /*
1622 * This was a response to a unsolicited NOPIN ping.
1623 */
1624 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1625 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1626 if (!cmd_p)
1627 return -EINVAL;
1628
1629 iscsit_stop_nopin_response_timer(conn);
1630
1631 cmd_p->i_state = ISTATE_REMOVE;
1632 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1633
1634 iscsit_start_nopin_timer(conn);
1635 return 0;
1636 }
1637 /*
1638 * Otherwise, initiator is not expecting a NOPIN is response.
1639 * Just ignore for now.
1640 */
1641 return 0;
1642 }
1643 EXPORT_SYMBOL(iscsit_process_nop_out);
1644
1645 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1646 unsigned char *buf)
1647 {
1648 unsigned char *ping_data = NULL;
1649 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1650 struct kvec *iov = NULL;
1651 u32 payload_length = ntoh24(hdr->dlength);
1652 int ret;
1653
1654 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1655 if (ret < 0)
1656 return 0;
1657 /*
1658 * Handle NOP-OUT payload for traditional iSCSI sockets
1659 */
1660 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1661 u32 checksum, data_crc, padding = 0;
1662 int niov = 0, rx_got, rx_size = payload_length;
1663
1664 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1665 if (!ping_data) {
1666 pr_err("Unable to allocate memory for"
1667 " NOPOUT ping data.\n");
1668 ret = -1;
1669 goto out;
1670 }
1671
1672 iov = &cmd->iov_misc[0];
1673 iov[niov].iov_base = ping_data;
1674 iov[niov++].iov_len = payload_length;
1675
1676 padding = ((-payload_length) & 3);
1677 if (padding != 0) {
1678 pr_debug("Receiving %u additional bytes"
1679 " for padding.\n", padding);
1680 iov[niov].iov_base = &cmd->pad_bytes;
1681 iov[niov++].iov_len = padding;
1682 rx_size += padding;
1683 }
1684 if (conn->conn_ops->DataDigest) {
1685 iov[niov].iov_base = &checksum;
1686 iov[niov++].iov_len = ISCSI_CRC_LEN;
1687 rx_size += ISCSI_CRC_LEN;
1688 }
1689
1690 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1691 if (rx_got != rx_size) {
1692 ret = -1;
1693 goto out;
1694 }
1695
1696 if (conn->conn_ops->DataDigest) {
1697 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1698 ping_data, payload_length,
1699 padding, cmd->pad_bytes,
1700 (u8 *)&data_crc);
1701
1702 if (checksum != data_crc) {
1703 pr_err("Ping data CRC32C DataDigest"
1704 " 0x%08x does not match computed 0x%08x\n",
1705 checksum, data_crc);
1706 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1707 pr_err("Unable to recover from"
1708 " NOPOUT Ping DataCRC failure while in"
1709 " ERL=0.\n");
1710 ret = -1;
1711 goto out;
1712 } else {
1713 /*
1714 * Silently drop this PDU and let the
1715 * initiator plug the CmdSN gap.
1716 */
1717 pr_debug("Dropping NOPOUT"
1718 " Command CmdSN: 0x%08x due to"
1719 " DataCRC error.\n", hdr->cmdsn);
1720 ret = 0;
1721 goto out;
1722 }
1723 } else {
1724 pr_debug("Got CRC32C DataDigest"
1725 " 0x%08x for %u bytes of ping data.\n",
1726 checksum, payload_length);
1727 }
1728 }
1729
1730 ping_data[payload_length] = '\0';
1731 /*
1732 * Attach ping data to struct iscsi_cmd->buf_ptr.
1733 */
1734 cmd->buf_ptr = ping_data;
1735 cmd->buf_ptr_size = payload_length;
1736
1737 pr_debug("Got %u bytes of NOPOUT ping"
1738 " data.\n", payload_length);
1739 pr_debug("Ping Data: \"%s\"\n", ping_data);
1740 }
1741
1742 return iscsit_process_nop_out(conn, cmd, hdr);
1743 out:
1744 if (cmd)
1745 iscsit_free_cmd(cmd, false);
1746
1747 kfree(ping_data);
1748 return ret;
1749 }
1750
1751 int
1752 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1753 unsigned char *buf)
1754 {
1755 struct se_tmr_req *se_tmr;
1756 struct iscsi_tmr_req *tmr_req;
1757 struct iscsi_tm *hdr;
1758 int out_of_order_cmdsn = 0, ret;
1759 bool sess_ref = false;
1760 u8 function;
1761
1762 hdr = (struct iscsi_tm *) buf;
1763 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1764 function = hdr->flags;
1765
1766 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1767 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1768 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1769 hdr->rtt, hdr->refcmdsn, conn->cid);
1770
1771 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1772 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1773 hdr->rtt != RESERVED_ITT)) {
1774 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1775 hdr->rtt = RESERVED_ITT;
1776 }
1777
1778 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1779 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1780 pr_err("Task Management Request TASK_REASSIGN not"
1781 " issued as immediate command, bad iSCSI Initiator"
1782 "implementation\n");
1783 return iscsit_add_reject_cmd(cmd,
1784 ISCSI_REASON_PROTOCOL_ERROR, buf);
1785 }
1786 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1787 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1788 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1789
1790 cmd->data_direction = DMA_NONE;
1791
1792 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1793 if (!cmd->tmr_req) {
1794 pr_err("Unable to allocate memory for"
1795 " Task Management command!\n");
1796 return iscsit_add_reject_cmd(cmd,
1797 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1798 buf);
1799 }
1800
1801 /*
1802 * TASK_REASSIGN for ERL=2 / connection stays inside of
1803 * LIO-Target $FABRIC_MOD
1804 */
1805 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1806
1807 u8 tcm_function;
1808 int ret;
1809
1810 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1811 conn->sess->se_sess, 0, DMA_NONE,
1812 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1813
1814 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1815 sess_ref = true;
1816
1817 switch (function) {
1818 case ISCSI_TM_FUNC_ABORT_TASK:
1819 tcm_function = TMR_ABORT_TASK;
1820 break;
1821 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1822 tcm_function = TMR_ABORT_TASK_SET;
1823 break;
1824 case ISCSI_TM_FUNC_CLEAR_ACA:
1825 tcm_function = TMR_CLEAR_ACA;
1826 break;
1827 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1828 tcm_function = TMR_CLEAR_TASK_SET;
1829 break;
1830 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1831 tcm_function = TMR_LUN_RESET;
1832 break;
1833 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1834 tcm_function = TMR_TARGET_WARM_RESET;
1835 break;
1836 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1837 tcm_function = TMR_TARGET_COLD_RESET;
1838 break;
1839 default:
1840 pr_err("Unknown iSCSI TMR Function:"
1841 " 0x%02x\n", function);
1842 return iscsit_add_reject_cmd(cmd,
1843 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1844 }
1845
1846 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1847 tcm_function, GFP_KERNEL);
1848 if (ret < 0)
1849 return iscsit_add_reject_cmd(cmd,
1850 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1851
1852 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1853 }
1854
1855 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1856 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1857 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1858 cmd->init_task_tag = hdr->itt;
1859 cmd->targ_xfer_tag = 0xFFFFFFFF;
1860 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1861 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1862 se_tmr = cmd->se_cmd.se_tmr_req;
1863 tmr_req = cmd->tmr_req;
1864 /*
1865 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1866 */
1867 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1868 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1869 scsilun_to_int(&hdr->lun));
1870 if (ret < 0) {
1871 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1872 goto attach;
1873 }
1874 }
1875
1876 switch (function) {
1877 case ISCSI_TM_FUNC_ABORT_TASK:
1878 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1879 if (se_tmr->response)
1880 goto attach;
1881 break;
1882 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1883 case ISCSI_TM_FUNC_CLEAR_ACA:
1884 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1885 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1886 break;
1887 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1888 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1889 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1890 goto attach;
1891 }
1892 break;
1893 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1894 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1895 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1896 goto attach;
1897 }
1898 break;
1899 case ISCSI_TM_FUNC_TASK_REASSIGN:
1900 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1901 /*
1902 * Perform sanity checks on the ExpDataSN only if the
1903 * TASK_REASSIGN was successful.
1904 */
1905 if (se_tmr->response)
1906 break;
1907
1908 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1909 return iscsit_add_reject_cmd(cmd,
1910 ISCSI_REASON_BOOKMARK_INVALID, buf);
1911 break;
1912 default:
1913 pr_err("Unknown TMR function: 0x%02x, protocol"
1914 " error.\n", function);
1915 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1916 goto attach;
1917 }
1918
1919 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1920 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1921 se_tmr->call_transport = 1;
1922 attach:
1923 spin_lock_bh(&conn->cmd_lock);
1924 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1925 spin_unlock_bh(&conn->cmd_lock);
1926
1927 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1928 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1929 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1930 out_of_order_cmdsn = 1;
1931 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1932 return 0;
1933 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1934 return -1;
1935 }
1936 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1937
1938 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1939 return 0;
1940 /*
1941 * Found the referenced task, send to transport for processing.
1942 */
1943 if (se_tmr->call_transport)
1944 return transport_generic_handle_tmr(&cmd->se_cmd);
1945
1946 /*
1947 * Could not find the referenced LUN, task, or Task Management
1948 * command not authorized or supported. Change state and
1949 * let the tx_thread send the response.
1950 *
1951 * For connection recovery, this is also the default action for
1952 * TMR TASK_REASSIGN.
1953 */
1954 if (sess_ref) {
1955 pr_debug("Handle TMR, using sess_ref=true check\n");
1956 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1957 }
1958
1959 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1960 return 0;
1961 }
1962 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1963
1964 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1965 int
1966 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1967 struct iscsi_text *hdr)
1968 {
1969 u32 payload_length = ntoh24(hdr->dlength);
1970
1971 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1972 pr_err("Unable to accept text parameter length: %u"
1973 "greater than MaxXmitDataSegmentLength %u.\n",
1974 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1975 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1976 (unsigned char *)hdr);
1977 }
1978
1979 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1980 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1981 pr_err("Multi sequence text commands currently not supported\n");
1982 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1983 (unsigned char *)hdr);
1984 }
1985
1986 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1987 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1988 hdr->exp_statsn, payload_length);
1989
1990 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1991 cmd->i_state = ISTATE_SEND_TEXTRSP;
1992 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1993 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1994 cmd->targ_xfer_tag = 0xFFFFFFFF;
1995 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1996 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1997 cmd->data_direction = DMA_NONE;
1998 cmd->text_in_ptr = NULL;
1999
2000 return 0;
2001 }
2002 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2003
2004 int
2005 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2006 struct iscsi_text *hdr)
2007 {
2008 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2009 int cmdsn_ret;
2010
2011 if (!text_in) {
2012 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2013 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2014 pr_err("Unable to locate text_in buffer for sendtargets"
2015 " discovery\n");
2016 goto reject;
2017 }
2018 goto empty_sendtargets;
2019 }
2020 if (strncmp("SendTargets", text_in, 11) != 0) {
2021 pr_err("Received Text Data that is not"
2022 " SendTargets, cannot continue.\n");
2023 goto reject;
2024 }
2025 text_ptr = strchr(text_in, '=');
2026 if (!text_ptr) {
2027 pr_err("No \"=\" separator found in Text Data,"
2028 " cannot continue.\n");
2029 goto reject;
2030 }
2031 if (!strncmp("=All", text_ptr, 4)) {
2032 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2033 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2034 !strncmp("=eui.", text_ptr, 5)) {
2035 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2036 } else {
2037 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2038 goto reject;
2039 }
2040
2041 spin_lock_bh(&conn->cmd_lock);
2042 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2043 spin_unlock_bh(&conn->cmd_lock);
2044
2045 empty_sendtargets:
2046 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2047
2048 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2049 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2050 (unsigned char *)hdr, hdr->cmdsn);
2051 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2052 return -1;
2053
2054 return 0;
2055 }
2056
2057 return iscsit_execute_cmd(cmd, 0);
2058
2059 reject:
2060 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2061 (unsigned char *)hdr);
2062 }
2063 EXPORT_SYMBOL(iscsit_process_text_cmd);
2064
2065 static int
2066 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2067 unsigned char *buf)
2068 {
2069 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2070 char *text_in = NULL;
2071 u32 payload_length = ntoh24(hdr->dlength);
2072 int rx_size, rc;
2073
2074 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2075 if (rc < 0)
2076 return 0;
2077
2078 rx_size = payload_length;
2079 if (payload_length) {
2080 u32 checksum = 0, data_crc = 0;
2081 u32 padding = 0, pad_bytes = 0;
2082 int niov = 0, rx_got;
2083 struct kvec iov[3];
2084
2085 text_in = kzalloc(payload_length, GFP_KERNEL);
2086 if (!text_in) {
2087 pr_err("Unable to allocate memory for"
2088 " incoming text parameters\n");
2089 goto reject;
2090 }
2091 cmd->text_in_ptr = text_in;
2092
2093 memset(iov, 0, 3 * sizeof(struct kvec));
2094 iov[niov].iov_base = text_in;
2095 iov[niov++].iov_len = payload_length;
2096
2097 padding = ((-payload_length) & 3);
2098 if (padding != 0) {
2099 iov[niov].iov_base = &pad_bytes;
2100 iov[niov++].iov_len = padding;
2101 rx_size += padding;
2102 pr_debug("Receiving %u additional bytes"
2103 " for padding.\n", padding);
2104 }
2105 if (conn->conn_ops->DataDigest) {
2106 iov[niov].iov_base = &checksum;
2107 iov[niov++].iov_len = ISCSI_CRC_LEN;
2108 rx_size += ISCSI_CRC_LEN;
2109 }
2110
2111 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2112 if (rx_got != rx_size)
2113 goto reject;
2114
2115 if (conn->conn_ops->DataDigest) {
2116 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2117 text_in, payload_length,
2118 padding, (u8 *)&pad_bytes,
2119 (u8 *)&data_crc);
2120
2121 if (checksum != data_crc) {
2122 pr_err("Text data CRC32C DataDigest"
2123 " 0x%08x does not match computed"
2124 " 0x%08x\n", checksum, data_crc);
2125 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2126 pr_err("Unable to recover from"
2127 " Text Data digest failure while in"
2128 " ERL=0.\n");
2129 goto reject;
2130 } else {
2131 /*
2132 * Silently drop this PDU and let the
2133 * initiator plug the CmdSN gap.
2134 */
2135 pr_debug("Dropping Text"
2136 " Command CmdSN: 0x%08x due to"
2137 " DataCRC error.\n", hdr->cmdsn);
2138 kfree(text_in);
2139 return 0;
2140 }
2141 } else {
2142 pr_debug("Got CRC32C DataDigest"
2143 " 0x%08x for %u bytes of text data.\n",
2144 checksum, payload_length);
2145 }
2146 }
2147 text_in[payload_length - 1] = '\0';
2148 pr_debug("Successfully read %d bytes of text"
2149 " data.\n", payload_length);
2150 }
2151
2152 return iscsit_process_text_cmd(conn, cmd, hdr);
2153
2154 reject:
2155 kfree(cmd->text_in_ptr);
2156 cmd->text_in_ptr = NULL;
2157 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2158 }
2159
2160 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2161 {
2162 struct iscsi_conn *conn_p;
2163 struct iscsi_session *sess = conn->sess;
2164
2165 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2166 " for SID: %u.\n", conn->cid, conn->sess->sid);
2167
2168 atomic_set(&sess->session_logout, 1);
2169 atomic_set(&conn->conn_logout_remove, 1);
2170 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2171
2172 iscsit_inc_conn_usage_count(conn);
2173 iscsit_inc_session_usage_count(sess);
2174
2175 spin_lock_bh(&sess->conn_lock);
2176 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2177 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2178 continue;
2179
2180 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2181 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2182 }
2183 spin_unlock_bh(&sess->conn_lock);
2184
2185 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2186
2187 return 0;
2188 }
2189
2190 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2191 {
2192 struct iscsi_conn *l_conn;
2193 struct iscsi_session *sess = conn->sess;
2194
2195 pr_debug("Received logout request CLOSECONNECTION for CID:"
2196 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2197
2198 /*
2199 * A Logout Request with a CLOSECONNECTION reason code for a CID
2200 * can arrive on a connection with a differing CID.
2201 */
2202 if (conn->cid == cmd->logout_cid) {
2203 spin_lock_bh(&conn->state_lock);
2204 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2205 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2206
2207 atomic_set(&conn->conn_logout_remove, 1);
2208 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2209 iscsit_inc_conn_usage_count(conn);
2210
2211 spin_unlock_bh(&conn->state_lock);
2212 } else {
2213 /*
2214 * Handle all different cid CLOSECONNECTION requests in
2215 * iscsit_logout_post_handler_diffcid() as to give enough
2216 * time for any non immediate command's CmdSN to be
2217 * acknowledged on the connection in question.
2218 *
2219 * Here we simply make sure the CID is still around.
2220 */
2221 l_conn = iscsit_get_conn_from_cid(sess,
2222 cmd->logout_cid);
2223 if (!l_conn) {
2224 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2225 iscsit_add_cmd_to_response_queue(cmd, conn,
2226 cmd->i_state);
2227 return 0;
2228 }
2229
2230 iscsit_dec_conn_usage_count(l_conn);
2231 }
2232
2233 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2234
2235 return 0;
2236 }
2237
2238 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2239 {
2240 struct iscsi_session *sess = conn->sess;
2241
2242 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2243 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2244
2245 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2246 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2247 " while ERL!=2.\n");
2248 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2249 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2250 return 0;
2251 }
2252
2253 if (conn->cid == cmd->logout_cid) {
2254 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2255 " with CID: %hu on CID: %hu, implementation error.\n",
2256 cmd->logout_cid, conn->cid);
2257 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2258 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2259 return 0;
2260 }
2261
2262 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2263
2264 return 0;
2265 }
2266
2267 int
2268 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2269 unsigned char *buf)
2270 {
2271 int cmdsn_ret, logout_remove = 0;
2272 u8 reason_code = 0;
2273 struct iscsi_logout *hdr;
2274 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2275
2276 hdr = (struct iscsi_logout *) buf;
2277 reason_code = (hdr->flags & 0x7f);
2278
2279 if (tiqn) {
2280 spin_lock(&tiqn->logout_stats.lock);
2281 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2282 tiqn->logout_stats.normal_logouts++;
2283 else
2284 tiqn->logout_stats.abnormal_logouts++;
2285 spin_unlock(&tiqn->logout_stats.lock);
2286 }
2287
2288 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2289 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2290 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2291 hdr->cid, conn->cid);
2292
2293 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2294 pr_err("Received logout request on connection that"
2295 " is not in logged in state, ignoring request.\n");
2296 iscsit_free_cmd(cmd, false);
2297 return 0;
2298 }
2299
2300 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2301 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2302 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2303 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2304 cmd->targ_xfer_tag = 0xFFFFFFFF;
2305 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2306 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2307 cmd->logout_cid = be16_to_cpu(hdr->cid);
2308 cmd->logout_reason = reason_code;
2309 cmd->data_direction = DMA_NONE;
2310
2311 /*
2312 * We need to sleep in these cases (by returning 1) until the Logout
2313 * Response gets sent in the tx thread.
2314 */
2315 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2316 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2317 be16_to_cpu(hdr->cid) == conn->cid))
2318 logout_remove = 1;
2319
2320 spin_lock_bh(&conn->cmd_lock);
2321 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2322 spin_unlock_bh(&conn->cmd_lock);
2323
2324 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2325 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2326
2327 /*
2328 * Immediate commands are executed, well, immediately.
2329 * Non-Immediate Logout Commands are executed in CmdSN order.
2330 */
2331 if (cmd->immediate_cmd) {
2332 int ret = iscsit_execute_cmd(cmd, 0);
2333
2334 if (ret < 0)
2335 return ret;
2336 } else {
2337 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2338 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2339 logout_remove = 0;
2340 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2341 return -1;
2342 }
2343
2344 return logout_remove;
2345 }
2346 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2347
2348 static int iscsit_handle_snack(
2349 struct iscsi_conn *conn,
2350 unsigned char *buf)
2351 {
2352 struct iscsi_snack *hdr;
2353
2354 hdr = (struct iscsi_snack *) buf;
2355 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2356
2357 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2358 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2359 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2360 hdr->begrun, hdr->runlength, conn->cid);
2361
2362 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2363 pr_err("Initiator sent SNACK request while in"
2364 " ErrorRecoveryLevel=0.\n");
2365 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2366 buf);
2367 }
2368 /*
2369 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2370 * call from inside iscsi_send_recovery_datain_or_r2t().
2371 */
2372 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2373 case 0:
2374 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2375 hdr->itt,
2376 be32_to_cpu(hdr->ttt),
2377 be32_to_cpu(hdr->begrun),
2378 be32_to_cpu(hdr->runlength));
2379 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2380 return iscsit_handle_status_snack(conn, hdr->itt,
2381 be32_to_cpu(hdr->ttt),
2382 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2383 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2384 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2385 be32_to_cpu(hdr->begrun),
2386 be32_to_cpu(hdr->runlength));
2387 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2388 /* FIXME: Support R-Data SNACK */
2389 pr_err("R-Data SNACK Not Supported.\n");
2390 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2391 buf);
2392 default:
2393 pr_err("Unknown SNACK type 0x%02x, protocol"
2394 " error.\n", hdr->flags & 0x0f);
2395 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2396 buf);
2397 }
2398
2399 return 0;
2400 }
2401
2402 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2403 {
2404 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2405 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2406 wait_for_completion_interruptible_timeout(
2407 &conn->rx_half_close_comp,
2408 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2409 }
2410 }
2411
2412 static int iscsit_handle_immediate_data(
2413 struct iscsi_cmd *cmd,
2414 struct iscsi_scsi_req *hdr,
2415 u32 length)
2416 {
2417 int iov_ret, rx_got = 0, rx_size = 0;
2418 u32 checksum, iov_count = 0, padding = 0;
2419 struct iscsi_conn *conn = cmd->conn;
2420 struct kvec *iov;
2421
2422 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2423 if (iov_ret < 0)
2424 return IMMEDIATE_DATA_CANNOT_RECOVER;
2425
2426 rx_size = length;
2427 iov_count = iov_ret;
2428 iov = &cmd->iov_data[0];
2429
2430 padding = ((-length) & 3);
2431 if (padding != 0) {
2432 iov[iov_count].iov_base = cmd->pad_bytes;
2433 iov[iov_count++].iov_len = padding;
2434 rx_size += padding;
2435 }
2436
2437 if (conn->conn_ops->DataDigest) {
2438 iov[iov_count].iov_base = &checksum;
2439 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2440 rx_size += ISCSI_CRC_LEN;
2441 }
2442
2443 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2444
2445 iscsit_unmap_iovec(cmd);
2446
2447 if (rx_got != rx_size) {
2448 iscsit_rx_thread_wait_for_tcp(conn);
2449 return IMMEDIATE_DATA_CANNOT_RECOVER;
2450 }
2451
2452 if (conn->conn_ops->DataDigest) {
2453 u32 data_crc;
2454
2455 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2456 cmd->write_data_done, length, padding,
2457 cmd->pad_bytes);
2458
2459 if (checksum != data_crc) {
2460 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2461 " does not match computed 0x%08x\n", checksum,
2462 data_crc);
2463
2464 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2465 pr_err("Unable to recover from"
2466 " Immediate Data digest failure while"
2467 " in ERL=0.\n");
2468 iscsit_reject_cmd(cmd,
2469 ISCSI_REASON_DATA_DIGEST_ERROR,
2470 (unsigned char *)hdr);
2471 return IMMEDIATE_DATA_CANNOT_RECOVER;
2472 } else {
2473 iscsit_reject_cmd(cmd,
2474 ISCSI_REASON_DATA_DIGEST_ERROR,
2475 (unsigned char *)hdr);
2476 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2477 }
2478 } else {
2479 pr_debug("Got CRC32C DataDigest 0x%08x for"
2480 " %u bytes of Immediate Data\n", checksum,
2481 length);
2482 }
2483 }
2484
2485 cmd->write_data_done += length;
2486
2487 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2488 spin_lock_bh(&cmd->istate_lock);
2489 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2490 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2491 spin_unlock_bh(&cmd->istate_lock);
2492 }
2493
2494 return IMMEDIATE_DATA_NORMAL_OPERATION;
2495 }
2496
2497 /*
2498 * Called with sess->conn_lock held.
2499 */
2500 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2501 with active network interface */
2502 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2503 {
2504 struct iscsi_cmd *cmd;
2505 struct iscsi_conn *conn_p;
2506 bool found = false;
2507
2508 /*
2509 * Only send a Asynchronous Message on connections whos network
2510 * interface is still functional.
2511 */
2512 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2513 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2514 iscsit_inc_conn_usage_count(conn_p);
2515 found = true;
2516 break;
2517 }
2518 }
2519
2520 if (!found)
2521 return;
2522
2523 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2524 if (!cmd) {
2525 iscsit_dec_conn_usage_count(conn_p);
2526 return;
2527 }
2528
2529 cmd->logout_cid = conn->cid;
2530 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2531 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2532
2533 spin_lock_bh(&conn_p->cmd_lock);
2534 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2535 spin_unlock_bh(&conn_p->cmd_lock);
2536
2537 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2538 iscsit_dec_conn_usage_count(conn_p);
2539 }
2540
2541 static int iscsit_send_conn_drop_async_message(
2542 struct iscsi_cmd *cmd,
2543 struct iscsi_conn *conn)
2544 {
2545 struct iscsi_async *hdr;
2546
2547 cmd->tx_size = ISCSI_HDR_LEN;
2548 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2549
2550 hdr = (struct iscsi_async *) cmd->pdu;
2551 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2552 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2553 cmd->init_task_tag = RESERVED_ITT;
2554 cmd->targ_xfer_tag = 0xFFFFFFFF;
2555 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2556 cmd->stat_sn = conn->stat_sn++;
2557 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2558 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2559 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2560 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2561 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2562 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2563 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2564
2565 if (conn->conn_ops->HeaderDigest) {
2566 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2567
2568 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2569 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2570
2571 cmd->tx_size += ISCSI_CRC_LEN;
2572 pr_debug("Attaching CRC32C HeaderDigest to"
2573 " Async Message 0x%08x\n", *header_digest);
2574 }
2575
2576 cmd->iov_misc[0].iov_base = cmd->pdu;
2577 cmd->iov_misc[0].iov_len = cmd->tx_size;
2578 cmd->iov_misc_count = 1;
2579
2580 pr_debug("Sending Connection Dropped Async Message StatSN:"
2581 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2582 cmd->logout_cid, conn->cid);
2583 return 0;
2584 }
2585
2586 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2587 {
2588 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2589 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2590 wait_for_completion_interruptible_timeout(
2591 &conn->tx_half_close_comp,
2592 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2593 }
2594 }
2595
2596 static void
2597 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2598 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2599 bool set_statsn)
2600 {
2601 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2602 hdr->flags = datain->flags;
2603 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2604 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2605 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2606 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2607 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2608 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2609 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2610 }
2611 }
2612 hton24(hdr->dlength, datain->length);
2613 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2614 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2615 (struct scsi_lun *)&hdr->lun);
2616 else
2617 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2618
2619 hdr->itt = cmd->init_task_tag;
2620
2621 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2622 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2623 else
2624 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2625 if (set_statsn)
2626 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2627 else
2628 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2629
2630 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2631 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2632 hdr->datasn = cpu_to_be32(datain->data_sn);
2633 hdr->offset = cpu_to_be32(datain->offset);
2634
2635 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2636 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2637 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2638 ntohl(hdr->offset), datain->length, conn->cid);
2639 }
2640
2641 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2642 {
2643 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2644 struct iscsi_datain datain;
2645 struct iscsi_datain_req *dr;
2646 struct kvec *iov;
2647 u32 iov_count = 0, tx_size = 0;
2648 int eodr = 0, ret, iov_ret;
2649 bool set_statsn = false;
2650
2651 memset(&datain, 0, sizeof(struct iscsi_datain));
2652 dr = iscsit_get_datain_values(cmd, &datain);
2653 if (!dr) {
2654 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2655 cmd->init_task_tag);
2656 return -1;
2657 }
2658 /*
2659 * Be paranoid and double check the logic for now.
2660 */
2661 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2662 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2663 " datain.length: %u exceeds cmd->data_length: %u\n",
2664 cmd->init_task_tag, datain.offset, datain.length,
2665 cmd->se_cmd.data_length);
2666 return -1;
2667 }
2668
2669 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2670 /*
2671 * Special case for successfully execution w/ both DATAIN
2672 * and Sense Data.
2673 */
2674 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2675 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2676 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2677 else {
2678 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2679 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2680 iscsit_increment_maxcmdsn(cmd, conn->sess);
2681 cmd->stat_sn = conn->stat_sn++;
2682 set_statsn = true;
2683 } else if (dr->dr_complete ==
2684 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2685 set_statsn = true;
2686 }
2687
2688 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2689
2690 iov = &cmd->iov_data[0];
2691 iov[iov_count].iov_base = cmd->pdu;
2692 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2693 tx_size += ISCSI_HDR_LEN;
2694
2695 if (conn->conn_ops->HeaderDigest) {
2696 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2697
2698 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2699 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2700
2701 iov[0].iov_len += ISCSI_CRC_LEN;
2702 tx_size += ISCSI_CRC_LEN;
2703
2704 pr_debug("Attaching CRC32 HeaderDigest"
2705 " for DataIN PDU 0x%08x\n", *header_digest);
2706 }
2707
2708 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2709 datain.offset, datain.length);
2710 if (iov_ret < 0)
2711 return -1;
2712
2713 iov_count += iov_ret;
2714 tx_size += datain.length;
2715
2716 cmd->padding = ((-datain.length) & 3);
2717 if (cmd->padding) {
2718 iov[iov_count].iov_base = cmd->pad_bytes;
2719 iov[iov_count++].iov_len = cmd->padding;
2720 tx_size += cmd->padding;
2721
2722 pr_debug("Attaching %u padding bytes\n",
2723 cmd->padding);
2724 }
2725 if (conn->conn_ops->DataDigest) {
2726 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2727 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2728
2729 iov[iov_count].iov_base = &cmd->data_crc;
2730 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2731 tx_size += ISCSI_CRC_LEN;
2732
2733 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2734 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2735 }
2736
2737 cmd->iov_data_count = iov_count;
2738 cmd->tx_size = tx_size;
2739
2740 /* sendpage is preferred but can't insert markers */
2741 if (!conn->conn_ops->IFMarker)
2742 ret = iscsit_fe_sendpage_sg(cmd, conn);
2743 else
2744 ret = iscsit_send_tx_data(cmd, conn, 0);
2745
2746 iscsit_unmap_iovec(cmd);
2747
2748 if (ret < 0) {
2749 iscsit_tx_thread_wait_for_tcp(conn);
2750 return ret;
2751 }
2752
2753 if (dr->dr_complete) {
2754 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2755 2 : 1;
2756 iscsit_free_datain_req(cmd, dr);
2757 }
2758
2759 return eodr;
2760 }
2761
2762 int
2763 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2764 struct iscsi_logout_rsp *hdr)
2765 {
2766 struct iscsi_conn *logout_conn = NULL;
2767 struct iscsi_conn_recovery *cr = NULL;
2768 struct iscsi_session *sess = conn->sess;
2769 /*
2770 * The actual shutting down of Sessions and/or Connections
2771 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2772 * is done in scsi_logout_post_handler().
2773 */
2774 switch (cmd->logout_reason) {
2775 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2776 pr_debug("iSCSI session logout successful, setting"
2777 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2778 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2779 break;
2780 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2781 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2782 break;
2783 /*
2784 * For CLOSECONNECTION logout requests carrying
2785 * a matching logout CID -> local CID, the reference
2786 * for the local CID will have been incremented in
2787 * iscsi_logout_closeconnection().
2788 *
2789 * For CLOSECONNECTION logout requests carrying
2790 * a different CID than the connection it arrived
2791 * on, the connection responding to cmd->logout_cid
2792 * is stopped in iscsit_logout_post_handler_diffcid().
2793 */
2794
2795 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2796 " successful.\n", cmd->logout_cid, conn->cid);
2797 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2798 break;
2799 case ISCSI_LOGOUT_REASON_RECOVERY:
2800 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2801 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2802 break;
2803 /*
2804 * If the connection is still active from our point of view
2805 * force connection recovery to occur.
2806 */
2807 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2808 cmd->logout_cid);
2809 if (logout_conn) {
2810 iscsit_connection_reinstatement_rcfr(logout_conn);
2811 iscsit_dec_conn_usage_count(logout_conn);
2812 }
2813
2814 cr = iscsit_get_inactive_connection_recovery_entry(
2815 conn->sess, cmd->logout_cid);
2816 if (!cr) {
2817 pr_err("Unable to locate CID: %hu for"
2818 " REMOVECONNFORRECOVERY Logout Request.\n",
2819 cmd->logout_cid);
2820 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2821 break;
2822 }
2823
2824 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2825
2826 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2827 " for recovery for CID: %hu on CID: %hu successful.\n",
2828 cmd->logout_cid, conn->cid);
2829 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2830 break;
2831 default:
2832 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2833 cmd->logout_reason);
2834 return -1;
2835 }
2836
2837 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2838 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2839 hdr->response = cmd->logout_response;
2840 hdr->itt = cmd->init_task_tag;
2841 cmd->stat_sn = conn->stat_sn++;
2842 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2843
2844 iscsit_increment_maxcmdsn(cmd, conn->sess);
2845 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2846 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2847
2848 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2849 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2850 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2851 cmd->logout_cid, conn->cid);
2852
2853 return 0;
2854 }
2855 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2856
2857 static int
2858 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2859 {
2860 struct kvec *iov;
2861 int niov = 0, tx_size, rc;
2862
2863 rc = iscsit_build_logout_rsp(cmd, conn,
2864 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2865 if (rc < 0)
2866 return rc;
2867
2868 tx_size = ISCSI_HDR_LEN;
2869 iov = &cmd->iov_misc[0];
2870 iov[niov].iov_base = cmd->pdu;
2871 iov[niov++].iov_len = ISCSI_HDR_LEN;
2872
2873 if (conn->conn_ops->HeaderDigest) {
2874 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2875
2876 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2877 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2878
2879 iov[0].iov_len += ISCSI_CRC_LEN;
2880 tx_size += ISCSI_CRC_LEN;
2881 pr_debug("Attaching CRC32C HeaderDigest to"
2882 " Logout Response 0x%08x\n", *header_digest);
2883 }
2884 cmd->iov_misc_count = niov;
2885 cmd->tx_size = tx_size;
2886
2887 return 0;
2888 }
2889
2890 void
2891 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2892 struct iscsi_nopin *hdr, bool nopout_response)
2893 {
2894 hdr->opcode = ISCSI_OP_NOOP_IN;
2895 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2896 hton24(hdr->dlength, cmd->buf_ptr_size);
2897 if (nopout_response)
2898 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2899 hdr->itt = cmd->init_task_tag;
2900 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2901 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2902 conn->stat_sn;
2903 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2904
2905 if (nopout_response)
2906 iscsit_increment_maxcmdsn(cmd, conn->sess);
2907
2908 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2909 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2910
2911 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2912 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2913 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2914 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2915 }
2916 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2917
2918 /*
2919 * Unsolicited NOPIN, either requesting a response or not.
2920 */
2921 static int iscsit_send_unsolicited_nopin(
2922 struct iscsi_cmd *cmd,
2923 struct iscsi_conn *conn,
2924 int want_response)
2925 {
2926 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2927 int tx_size = ISCSI_HDR_LEN, ret;
2928
2929 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2930
2931 if (conn->conn_ops->HeaderDigest) {
2932 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2933
2934 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2935 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2936
2937 tx_size += ISCSI_CRC_LEN;
2938 pr_debug("Attaching CRC32C HeaderDigest to"
2939 " NopIN 0x%08x\n", *header_digest);
2940 }
2941
2942 cmd->iov_misc[0].iov_base = cmd->pdu;
2943 cmd->iov_misc[0].iov_len = tx_size;
2944 cmd->iov_misc_count = 1;
2945 cmd->tx_size = tx_size;
2946
2947 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2948 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2949
2950 ret = iscsit_send_tx_data(cmd, conn, 1);
2951 if (ret < 0) {
2952 iscsit_tx_thread_wait_for_tcp(conn);
2953 return ret;
2954 }
2955
2956 spin_lock_bh(&cmd->istate_lock);
2957 cmd->i_state = want_response ?
2958 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2959 spin_unlock_bh(&cmd->istate_lock);
2960
2961 return 0;
2962 }
2963
2964 static int
2965 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2966 {
2967 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2968 struct kvec *iov;
2969 u32 padding = 0;
2970 int niov = 0, tx_size;
2971
2972 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2973
2974 tx_size = ISCSI_HDR_LEN;
2975 iov = &cmd->iov_misc[0];
2976 iov[niov].iov_base = cmd->pdu;
2977 iov[niov++].iov_len = ISCSI_HDR_LEN;
2978
2979 if (conn->conn_ops->HeaderDigest) {
2980 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2981
2982 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2983 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2984
2985 iov[0].iov_len += ISCSI_CRC_LEN;
2986 tx_size += ISCSI_CRC_LEN;
2987 pr_debug("Attaching CRC32C HeaderDigest"
2988 " to NopIn 0x%08x\n", *header_digest);
2989 }
2990
2991 /*
2992 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2993 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2994 */
2995 if (cmd->buf_ptr_size) {
2996 iov[niov].iov_base = cmd->buf_ptr;
2997 iov[niov++].iov_len = cmd->buf_ptr_size;
2998 tx_size += cmd->buf_ptr_size;
2999
3000 pr_debug("Echoing back %u bytes of ping"
3001 " data.\n", cmd->buf_ptr_size);
3002
3003 padding = ((-cmd->buf_ptr_size) & 3);
3004 if (padding != 0) {
3005 iov[niov].iov_base = &cmd->pad_bytes;
3006 iov[niov++].iov_len = padding;
3007 tx_size += padding;
3008 pr_debug("Attaching %u additional"
3009 " padding bytes.\n", padding);
3010 }
3011 if (conn->conn_ops->DataDigest) {
3012 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3013 cmd->buf_ptr, cmd->buf_ptr_size,
3014 padding, (u8 *)&cmd->pad_bytes,
3015 (u8 *)&cmd->data_crc);
3016
3017 iov[niov].iov_base = &cmd->data_crc;
3018 iov[niov++].iov_len = ISCSI_CRC_LEN;
3019 tx_size += ISCSI_CRC_LEN;
3020 pr_debug("Attached DataDigest for %u"
3021 " bytes of ping data, CRC 0x%08x\n",
3022 cmd->buf_ptr_size, cmd->data_crc);
3023 }
3024 }
3025
3026 cmd->iov_misc_count = niov;
3027 cmd->tx_size = tx_size;
3028
3029 return 0;
3030 }
3031
3032 static int iscsit_send_r2t(
3033 struct iscsi_cmd *cmd,
3034 struct iscsi_conn *conn)
3035 {
3036 int tx_size = 0;
3037 struct iscsi_r2t *r2t;
3038 struct iscsi_r2t_rsp *hdr;
3039 int ret;
3040
3041 r2t = iscsit_get_r2t_from_list(cmd);
3042 if (!r2t)
3043 return -1;
3044
3045 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3046 memset(hdr, 0, ISCSI_HDR_LEN);
3047 hdr->opcode = ISCSI_OP_R2T;
3048 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3049 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3050 (struct scsi_lun *)&hdr->lun);
3051 hdr->itt = cmd->init_task_tag;
3052 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3053 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3054 hdr->statsn = cpu_to_be32(conn->stat_sn);
3055 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3056 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3057 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3058 hdr->data_offset = cpu_to_be32(r2t->offset);
3059 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3060
3061 cmd->iov_misc[0].iov_base = cmd->pdu;
3062 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3063 tx_size += ISCSI_HDR_LEN;
3064
3065 if (conn->conn_ops->HeaderDigest) {
3066 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3067
3068 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3069 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3070
3071 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3072 tx_size += ISCSI_CRC_LEN;
3073 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3074 " PDU 0x%08x\n", *header_digest);
3075 }
3076
3077 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3078 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3079 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3080 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3081 r2t->offset, r2t->xfer_len, conn->cid);
3082
3083 cmd->iov_misc_count = 1;
3084 cmd->tx_size = tx_size;
3085
3086 spin_lock_bh(&cmd->r2t_lock);
3087 r2t->sent_r2t = 1;
3088 spin_unlock_bh(&cmd->r2t_lock);
3089
3090 ret = iscsit_send_tx_data(cmd, conn, 1);
3091 if (ret < 0) {
3092 iscsit_tx_thread_wait_for_tcp(conn);
3093 return ret;
3094 }
3095
3096 spin_lock_bh(&cmd->dataout_timeout_lock);
3097 iscsit_start_dataout_timer(cmd, conn);
3098 spin_unlock_bh(&cmd->dataout_timeout_lock);
3099
3100 return 0;
3101 }
3102
3103 /*
3104 * @recovery: If called from iscsi_task_reassign_complete_write() for
3105 * connection recovery.
3106 */
3107 int iscsit_build_r2ts_for_cmd(
3108 struct iscsi_conn *conn,
3109 struct iscsi_cmd *cmd,
3110 bool recovery)
3111 {
3112 int first_r2t = 1;
3113 u32 offset = 0, xfer_len = 0;
3114
3115 spin_lock_bh(&cmd->r2t_lock);
3116 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3117 spin_unlock_bh(&cmd->r2t_lock);
3118 return 0;
3119 }
3120
3121 if (conn->sess->sess_ops->DataSequenceInOrder &&
3122 !recovery)
3123 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3124
3125 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3126 if (conn->sess->sess_ops->DataSequenceInOrder) {
3127 offset = cmd->r2t_offset;
3128
3129 if (first_r2t && recovery) {
3130 int new_data_end = offset +
3131 conn->sess->sess_ops->MaxBurstLength -
3132 cmd->next_burst_len;
3133
3134 if (new_data_end > cmd->se_cmd.data_length)
3135 xfer_len = cmd->se_cmd.data_length - offset;
3136 else
3137 xfer_len =
3138 conn->sess->sess_ops->MaxBurstLength -
3139 cmd->next_burst_len;
3140 } else {
3141 int new_data_end = offset +
3142 conn->sess->sess_ops->MaxBurstLength;
3143
3144 if (new_data_end > cmd->se_cmd.data_length)
3145 xfer_len = cmd->se_cmd.data_length - offset;
3146 else
3147 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3148 }
3149 cmd->r2t_offset += xfer_len;
3150
3151 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3152 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3153 } else {
3154 struct iscsi_seq *seq;
3155
3156 seq = iscsit_get_seq_holder_for_r2t(cmd);
3157 if (!seq) {
3158 spin_unlock_bh(&cmd->r2t_lock);
3159 return -1;
3160 }
3161
3162 offset = seq->offset;
3163 xfer_len = seq->xfer_len;
3164
3165 if (cmd->seq_send_order == cmd->seq_count)
3166 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3167 }
3168 cmd->outstanding_r2ts++;
3169 first_r2t = 0;
3170
3171 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3172 spin_unlock_bh(&cmd->r2t_lock);
3173 return -1;
3174 }
3175
3176 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3177 break;
3178 }
3179 spin_unlock_bh(&cmd->r2t_lock);
3180
3181 return 0;
3182 }
3183
3184 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3185 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3186 {
3187 if (inc_stat_sn)
3188 cmd->stat_sn = conn->stat_sn++;
3189
3190 atomic_long_inc(&conn->sess->rsp_pdus);
3191
3192 memset(hdr, 0, ISCSI_HDR_LEN);
3193 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3194 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3195 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3196 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3197 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3198 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3199 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3200 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3201 }
3202 hdr->response = cmd->iscsi_response;
3203 hdr->cmd_status = cmd->se_cmd.scsi_status;
3204 hdr->itt = cmd->init_task_tag;
3205 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3206
3207 iscsit_increment_maxcmdsn(cmd, conn->sess);
3208 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3209 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3210
3211 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3212 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3213 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3214 cmd->se_cmd.scsi_status, conn->cid);
3215 }
3216 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3217
3218 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3219 {
3220 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3221 struct kvec *iov;
3222 u32 padding = 0, tx_size = 0;
3223 int iov_count = 0;
3224 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3225
3226 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3227
3228 iov = &cmd->iov_misc[0];
3229 iov[iov_count].iov_base = cmd->pdu;
3230 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3231 tx_size += ISCSI_HDR_LEN;
3232
3233 /*
3234 * Attach SENSE DATA payload to iSCSI Response PDU
3235 */
3236 if (cmd->se_cmd.sense_buffer &&
3237 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3238 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3239 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3240 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3241
3242 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3243 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3244 iov[iov_count].iov_base = cmd->sense_buffer;
3245 iov[iov_count++].iov_len =
3246 (cmd->se_cmd.scsi_sense_length + padding);
3247 tx_size += cmd->se_cmd.scsi_sense_length;
3248
3249 if (padding) {
3250 memset(cmd->sense_buffer +
3251 cmd->se_cmd.scsi_sense_length, 0, padding);
3252 tx_size += padding;
3253 pr_debug("Adding %u bytes of padding to"
3254 " SENSE.\n", padding);
3255 }
3256
3257 if (conn->conn_ops->DataDigest) {
3258 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3259 cmd->sense_buffer,
3260 (cmd->se_cmd.scsi_sense_length + padding),
3261 0, NULL, (u8 *)&cmd->data_crc);
3262
3263 iov[iov_count].iov_base = &cmd->data_crc;
3264 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3265 tx_size += ISCSI_CRC_LEN;
3266
3267 pr_debug("Attaching CRC32 DataDigest for"
3268 " SENSE, %u bytes CRC 0x%08x\n",
3269 (cmd->se_cmd.scsi_sense_length + padding),
3270 cmd->data_crc);
3271 }
3272
3273 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3274 " Response PDU\n",
3275 cmd->se_cmd.scsi_sense_length);
3276 }
3277
3278 if (conn->conn_ops->HeaderDigest) {
3279 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3280
3281 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3282 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3283
3284 iov[0].iov_len += ISCSI_CRC_LEN;
3285 tx_size += ISCSI_CRC_LEN;
3286 pr_debug("Attaching CRC32 HeaderDigest for Response"
3287 " PDU 0x%08x\n", *header_digest);
3288 }
3289
3290 cmd->iov_misc_count = iov_count;
3291 cmd->tx_size = tx_size;
3292
3293 return 0;
3294 }
3295
3296 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3297 {
3298 switch (se_tmr->response) {
3299 case TMR_FUNCTION_COMPLETE:
3300 return ISCSI_TMF_RSP_COMPLETE;
3301 case TMR_TASK_DOES_NOT_EXIST:
3302 return ISCSI_TMF_RSP_NO_TASK;
3303 case TMR_LUN_DOES_NOT_EXIST:
3304 return ISCSI_TMF_RSP_NO_LUN;
3305 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3306 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3307 case TMR_FUNCTION_REJECTED:
3308 default:
3309 return ISCSI_TMF_RSP_REJECTED;
3310 }
3311 }
3312
3313 void
3314 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3315 struct iscsi_tm_rsp *hdr)
3316 {
3317 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3318
3319 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3320 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3321 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3322 hdr->itt = cmd->init_task_tag;
3323 cmd->stat_sn = conn->stat_sn++;
3324 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3325
3326 iscsit_increment_maxcmdsn(cmd, conn->sess);
3327 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3328 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3329
3330 pr_debug("Built Task Management Response ITT: 0x%08x,"
3331 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3332 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3333 }
3334 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3335
3336 static int
3337 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3338 {
3339 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3340 u32 tx_size = 0;
3341
3342 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3343
3344 cmd->iov_misc[0].iov_base = cmd->pdu;
3345 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3346 tx_size += ISCSI_HDR_LEN;
3347
3348 if (conn->conn_ops->HeaderDigest) {
3349 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3350
3351 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3352 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3353
3354 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3355 tx_size += ISCSI_CRC_LEN;
3356 pr_debug("Attaching CRC32 HeaderDigest for Task"
3357 " Mgmt Response PDU 0x%08x\n", *header_digest);
3358 }
3359
3360 cmd->iov_misc_count = 1;
3361 cmd->tx_size = tx_size;
3362
3363 return 0;
3364 }
3365
3366 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3367 {
3368 bool ret = false;
3369
3370 if (np->np_sockaddr.ss_family == AF_INET6) {
3371 const struct sockaddr_in6 sin6 = {
3372 .sin6_addr = IN6ADDR_ANY_INIT };
3373 struct sockaddr_in6 *sock_in6 =
3374 (struct sockaddr_in6 *)&np->np_sockaddr;
3375
3376 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3377 sin6.sin6_addr.s6_addr, 16))
3378 ret = true;
3379 } else {
3380 struct sockaddr_in * sock_in =
3381 (struct sockaddr_in *)&np->np_sockaddr;
3382
3383 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3384 ret = true;
3385 }
3386
3387 return ret;
3388 }
3389
3390 #define SENDTARGETS_BUF_LIMIT 32768U
3391
3392 static int
3393 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3394 enum iscsit_transport_type network_transport,
3395 int skip_bytes, bool *completed)
3396 {
3397 char *payload = NULL;
3398 struct iscsi_conn *conn = cmd->conn;
3399 struct iscsi_portal_group *tpg;
3400 struct iscsi_tiqn *tiqn;
3401 struct iscsi_tpg_np *tpg_np;
3402 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3403 int target_name_printed;
3404 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3405 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3406
3407 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3408 SENDTARGETS_BUF_LIMIT);
3409
3410 payload = kzalloc(buffer_len, GFP_KERNEL);
3411 if (!payload) {
3412 pr_err("Unable to allocate memory for sendtargets"
3413 " response.\n");
3414 return -ENOMEM;
3415 }
3416 /*
3417 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3418 * explicit case..
3419 */
3420 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3421 text_ptr = strchr(text_in, '=');
3422 if (!text_ptr) {
3423 pr_err("Unable to locate '=' string in text_in:"
3424 " %s\n", text_in);
3425 kfree(payload);
3426 return -EINVAL;
3427 }
3428 /*
3429 * Skip over '=' character..
3430 */
3431 text_ptr += 1;
3432 }
3433
3434 spin_lock(&tiqn_lock);
3435 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3436 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3437 strcmp(tiqn->tiqn, text_ptr)) {
3438 continue;
3439 }
3440
3441 target_name_printed = 0;
3442
3443 spin_lock(&tiqn->tiqn_tpg_lock);
3444 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3445
3446 /* If demo_mode_discovery=0 and generate_node_acls=0
3447 * (demo mode dislabed) do not return
3448 * TargetName+TargetAddress unless a NodeACL exists.
3449 */
3450
3451 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3452 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3453 (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3454 cmd->conn->sess->sess_ops->InitiatorName))) {
3455 continue;
3456 }
3457
3458 spin_lock(&tpg->tpg_state_lock);
3459 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3460 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3461 spin_unlock(&tpg->tpg_state_lock);
3462 continue;
3463 }
3464 spin_unlock(&tpg->tpg_state_lock);
3465
3466 spin_lock(&tpg->tpg_np_lock);
3467 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3468 tpg_np_list) {
3469 struct iscsi_np *np = tpg_np->tpg_np;
3470 bool inaddr_any = iscsit_check_inaddr_any(np);
3471 char *fmt_str;
3472
3473 if (np->np_network_transport != network_transport)
3474 continue;
3475
3476 if (!target_name_printed) {
3477 len = sprintf(buf, "TargetName=%s",
3478 tiqn->tiqn);
3479 len += 1;
3480
3481 if ((len + payload_len) > buffer_len) {
3482 spin_unlock(&tpg->tpg_np_lock);
3483 spin_unlock(&tiqn->tiqn_tpg_lock);
3484 end_of_buf = 1;
3485 goto eob;
3486 }
3487
3488 if (skip_bytes && len <= skip_bytes) {
3489 skip_bytes -= len;
3490 } else {
3491 memcpy(payload + payload_len, buf, len);
3492 payload_len += len;
3493 target_name_printed = 1;
3494 if (len > skip_bytes)
3495 skip_bytes = 0;
3496 }
3497 }
3498
3499 if (np->np_sockaddr.ss_family == AF_INET6)
3500 fmt_str = "TargetAddress=[%s]:%hu,%hu";
3501 else
3502 fmt_str = "TargetAddress=%s:%hu,%hu";
3503
3504 len = sprintf(buf, fmt_str,
3505 inaddr_any ? conn->local_ip : np->np_ip,
3506 np->np_port,
3507 tpg->tpgt);
3508 len += 1;
3509
3510 if ((len + payload_len) > buffer_len) {
3511 spin_unlock(&tpg->tpg_np_lock);
3512 spin_unlock(&tiqn->tiqn_tpg_lock);
3513 end_of_buf = 1;
3514 goto eob;
3515 }
3516
3517 if (skip_bytes && len <= skip_bytes) {
3518 skip_bytes -= len;
3519 } else {
3520 memcpy(payload + payload_len, buf, len);
3521 payload_len += len;
3522 if (len > skip_bytes)
3523 skip_bytes = 0;
3524 }
3525 }
3526 spin_unlock(&tpg->tpg_np_lock);
3527 }
3528 spin_unlock(&tiqn->tiqn_tpg_lock);
3529 eob:
3530 if (end_of_buf) {
3531 *completed = false;
3532 break;
3533 }
3534
3535 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3536 break;
3537 }
3538 spin_unlock(&tiqn_lock);
3539
3540 cmd->buf_ptr = payload;
3541
3542 return payload_len;
3543 }
3544
3545 int
3546 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3547 struct iscsi_text_rsp *hdr,
3548 enum iscsit_transport_type network_transport)
3549 {
3550 int text_length, padding;
3551 bool completed = true;
3552
3553 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3554 cmd->read_data_done,
3555 &completed);
3556 if (text_length < 0)
3557 return text_length;
3558
3559 if (completed) {
3560 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3561 } else {
3562 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3563 cmd->read_data_done += text_length;
3564 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3565 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3566 }
3567 hdr->opcode = ISCSI_OP_TEXT_RSP;
3568 padding = ((-text_length) & 3);
3569 hton24(hdr->dlength, text_length);
3570 hdr->itt = cmd->init_task_tag;
3571 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3572 cmd->stat_sn = conn->stat_sn++;
3573 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3574
3575 iscsit_increment_maxcmdsn(cmd, conn->sess);
3576 /*
3577 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3578 * correctly increment MaxCmdSN for each response answering a
3579 * non immediate text request with a valid CmdSN.
3580 */
3581 cmd->maxcmdsn_inc = 0;
3582 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3583 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3584
3585 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3586 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3587 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3588 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3589 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3590
3591 return text_length + padding;
3592 }
3593 EXPORT_SYMBOL(iscsit_build_text_rsp);
3594
3595 static int iscsit_send_text_rsp(
3596 struct iscsi_cmd *cmd,
3597 struct iscsi_conn *conn)
3598 {
3599 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3600 struct kvec *iov;
3601 u32 tx_size = 0;
3602 int text_length, iov_count = 0, rc;
3603
3604 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP);
3605 if (rc < 0)
3606 return rc;
3607
3608 text_length = rc;
3609 iov = &cmd->iov_misc[0];
3610 iov[iov_count].iov_base = cmd->pdu;
3611 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3612 iov[iov_count].iov_base = cmd->buf_ptr;
3613 iov[iov_count++].iov_len = text_length;
3614
3615 tx_size += (ISCSI_HDR_LEN + text_length);
3616
3617 if (conn->conn_ops->HeaderDigest) {
3618 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3619
3620 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3621 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3622
3623 iov[0].iov_len += ISCSI_CRC_LEN;
3624 tx_size += ISCSI_CRC_LEN;
3625 pr_debug("Attaching CRC32 HeaderDigest for"
3626 " Text Response PDU 0x%08x\n", *header_digest);
3627 }
3628
3629 if (conn->conn_ops->DataDigest) {
3630 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3631 cmd->buf_ptr, text_length,
3632 0, NULL, (u8 *)&cmd->data_crc);
3633
3634 iov[iov_count].iov_base = &cmd->data_crc;
3635 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3636 tx_size += ISCSI_CRC_LEN;
3637
3638 pr_debug("Attaching DataDigest for %u bytes of text"
3639 " data, CRC 0x%08x\n", text_length,
3640 cmd->data_crc);
3641 }
3642
3643 cmd->iov_misc_count = iov_count;
3644 cmd->tx_size = tx_size;
3645
3646 return 0;
3647 }
3648
3649 void
3650 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3651 struct iscsi_reject *hdr)
3652 {
3653 hdr->opcode = ISCSI_OP_REJECT;
3654 hdr->reason = cmd->reject_reason;
3655 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3656 hton24(hdr->dlength, ISCSI_HDR_LEN);
3657 hdr->ffffffff = cpu_to_be32(0xffffffff);
3658 cmd->stat_sn = conn->stat_sn++;
3659 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3660 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3661 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3662
3663 }
3664 EXPORT_SYMBOL(iscsit_build_reject);
3665
3666 static int iscsit_send_reject(
3667 struct iscsi_cmd *cmd,
3668 struct iscsi_conn *conn)
3669 {
3670 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3671 struct kvec *iov;
3672 u32 iov_count = 0, tx_size;
3673
3674 iscsit_build_reject(cmd, conn, hdr);
3675
3676 iov = &cmd->iov_misc[0];
3677 iov[iov_count].iov_base = cmd->pdu;
3678 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3679 iov[iov_count].iov_base = cmd->buf_ptr;
3680 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3681
3682 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3683
3684 if (conn->conn_ops->HeaderDigest) {
3685 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3686
3687 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3688 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3689
3690 iov[0].iov_len += ISCSI_CRC_LEN;
3691 tx_size += ISCSI_CRC_LEN;
3692 pr_debug("Attaching CRC32 HeaderDigest for"
3693 " REJECT PDU 0x%08x\n", *header_digest);
3694 }
3695
3696 if (conn->conn_ops->DataDigest) {
3697 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3698 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3699
3700 iov[iov_count].iov_base = &cmd->data_crc;
3701 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3702 tx_size += ISCSI_CRC_LEN;
3703 pr_debug("Attaching CRC32 DataDigest for REJECT"
3704 " PDU 0x%08x\n", cmd->data_crc);
3705 }
3706
3707 cmd->iov_misc_count = iov_count;
3708 cmd->tx_size = tx_size;
3709
3710 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3711 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3712
3713 return 0;
3714 }
3715
3716 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3717 {
3718 int ord, cpu;
3719 /*
3720 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3721 * within iscsit_start_kthreads()
3722 *
3723 * Here we use bitmap_id to determine which CPU that this
3724 * iSCSI connection's RX/TX threads will be scheduled to
3725 * execute upon.
3726 */
3727 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3728 for_each_online_cpu(cpu) {
3729 if (ord-- == 0) {
3730 cpumask_set_cpu(cpu, conn->conn_cpumask);
3731 return;
3732 }
3733 }
3734 /*
3735 * This should never be reached..
3736 */
3737 dump_stack();
3738 cpumask_setall(conn->conn_cpumask);
3739 }
3740
3741 static inline void iscsit_thread_check_cpumask(
3742 struct iscsi_conn *conn,
3743 struct task_struct *p,
3744 int mode)
3745 {
3746 /*
3747 * mode == 1 signals iscsi_target_tx_thread() usage.
3748 * mode == 0 signals iscsi_target_rx_thread() usage.
3749 */
3750 if (mode == 1) {
3751 if (!conn->conn_tx_reset_cpumask)
3752 return;
3753 conn->conn_tx_reset_cpumask = 0;
3754 } else {
3755 if (!conn->conn_rx_reset_cpumask)
3756 return;
3757 conn->conn_rx_reset_cpumask = 0;
3758 }
3759 /*
3760 * Update the CPU mask for this single kthread so that
3761 * both TX and RX kthreads are scheduled to run on the
3762 * same CPU.
3763 */
3764 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3765 }
3766
3767 static int
3768 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3769 {
3770 int ret;
3771
3772 switch (state) {
3773 case ISTATE_SEND_R2T:
3774 ret = iscsit_send_r2t(cmd, conn);
3775 if (ret < 0)
3776 goto err;
3777 break;
3778 case ISTATE_REMOVE:
3779 spin_lock_bh(&conn->cmd_lock);
3780 list_del_init(&cmd->i_conn_node);
3781 spin_unlock_bh(&conn->cmd_lock);
3782
3783 iscsit_free_cmd(cmd, false);
3784 break;
3785 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3786 iscsit_mod_nopin_response_timer(conn);
3787 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3788 if (ret < 0)
3789 goto err;
3790 break;
3791 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3792 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3793 if (ret < 0)
3794 goto err;
3795 break;
3796 default:
3797 pr_err("Unknown Opcode: 0x%02x ITT:"
3798 " 0x%08x, i_state: %d on CID: %hu\n",
3799 cmd->iscsi_opcode, cmd->init_task_tag, state,
3800 conn->cid);
3801 goto err;
3802 }
3803
3804 return 0;
3805
3806 err:
3807 return -1;
3808 }
3809
3810 static int
3811 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3812 {
3813 struct iscsit_transport *t = conn->conn_transport;
3814 struct iscsi_queue_req *qr;
3815 struct iscsi_cmd *cmd;
3816 u8 state;
3817 int ret;
3818
3819 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3820 atomic_set(&conn->check_immediate_queue, 0);
3821 cmd = qr->cmd;
3822 state = qr->state;
3823 kmem_cache_free(lio_qr_cache, qr);
3824
3825 ret = t->iscsit_immediate_queue(conn, cmd, state);
3826 if (ret < 0)
3827 return ret;
3828 }
3829
3830 return 0;
3831 }
3832
3833 static int
3834 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3835 {
3836 int ret;
3837
3838 check_rsp_state:
3839 switch (state) {
3840 case ISTATE_SEND_DATAIN:
3841 ret = iscsit_send_datain(cmd, conn);
3842 if (ret < 0)
3843 goto err;
3844 else if (!ret)
3845 /* more drs */
3846 goto check_rsp_state;
3847 else if (ret == 1) {
3848 /* all done */
3849 spin_lock_bh(&cmd->istate_lock);
3850 cmd->i_state = ISTATE_SENT_STATUS;
3851 spin_unlock_bh(&cmd->istate_lock);
3852
3853 if (atomic_read(&conn->check_immediate_queue))
3854 return 1;
3855
3856 return 0;
3857 } else if (ret == 2) {
3858 /* Still must send status,
3859 SCF_TRANSPORT_TASK_SENSE was set */
3860 spin_lock_bh(&cmd->istate_lock);
3861 cmd->i_state = ISTATE_SEND_STATUS;
3862 spin_unlock_bh(&cmd->istate_lock);
3863 state = ISTATE_SEND_STATUS;
3864 goto check_rsp_state;
3865 }
3866
3867 break;
3868 case ISTATE_SEND_STATUS:
3869 case ISTATE_SEND_STATUS_RECOVERY:
3870 ret = iscsit_send_response(cmd, conn);
3871 break;
3872 case ISTATE_SEND_LOGOUTRSP:
3873 ret = iscsit_send_logout(cmd, conn);
3874 break;
3875 case ISTATE_SEND_ASYNCMSG:
3876 ret = iscsit_send_conn_drop_async_message(
3877 cmd, conn);
3878 break;
3879 case ISTATE_SEND_NOPIN:
3880 ret = iscsit_send_nopin(cmd, conn);
3881 break;
3882 case ISTATE_SEND_REJECT:
3883 ret = iscsit_send_reject(cmd, conn);
3884 break;
3885 case ISTATE_SEND_TASKMGTRSP:
3886 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3887 if (ret != 0)
3888 break;
3889 ret = iscsit_tmr_post_handler(cmd, conn);
3890 if (ret != 0)
3891 iscsit_fall_back_to_erl0(conn->sess);
3892 break;
3893 case ISTATE_SEND_TEXTRSP:
3894 ret = iscsit_send_text_rsp(cmd, conn);
3895 break;
3896 default:
3897 pr_err("Unknown Opcode: 0x%02x ITT:"
3898 " 0x%08x, i_state: %d on CID: %hu\n",
3899 cmd->iscsi_opcode, cmd->init_task_tag,
3900 state, conn->cid);
3901 goto err;
3902 }
3903 if (ret < 0)
3904 goto err;
3905
3906 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3907 iscsit_tx_thread_wait_for_tcp(conn);
3908 iscsit_unmap_iovec(cmd);
3909 goto err;
3910 }
3911 iscsit_unmap_iovec(cmd);
3912
3913 switch (state) {
3914 case ISTATE_SEND_LOGOUTRSP:
3915 if (!iscsit_logout_post_handler(cmd, conn))
3916 return -ECONNRESET;
3917 /* fall through */
3918 case ISTATE_SEND_STATUS:
3919 case ISTATE_SEND_ASYNCMSG:
3920 case ISTATE_SEND_NOPIN:
3921 case ISTATE_SEND_STATUS_RECOVERY:
3922 case ISTATE_SEND_TEXTRSP:
3923 case ISTATE_SEND_TASKMGTRSP:
3924 case ISTATE_SEND_REJECT:
3925 spin_lock_bh(&cmd->istate_lock);
3926 cmd->i_state = ISTATE_SENT_STATUS;
3927 spin_unlock_bh(&cmd->istate_lock);
3928 break;
3929 default:
3930 pr_err("Unknown Opcode: 0x%02x ITT:"
3931 " 0x%08x, i_state: %d on CID: %hu\n",
3932 cmd->iscsi_opcode, cmd->init_task_tag,
3933 cmd->i_state, conn->cid);
3934 goto err;
3935 }
3936
3937 if (atomic_read(&conn->check_immediate_queue))
3938 return 1;
3939
3940 return 0;
3941
3942 err:
3943 return -1;
3944 }
3945
3946 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3947 {
3948 struct iscsit_transport *t = conn->conn_transport;
3949 struct iscsi_queue_req *qr;
3950 struct iscsi_cmd *cmd;
3951 u8 state;
3952 int ret;
3953
3954 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3955 cmd = qr->cmd;
3956 state = qr->state;
3957 kmem_cache_free(lio_qr_cache, qr);
3958
3959 ret = t->iscsit_response_queue(conn, cmd, state);
3960 if (ret == 1 || ret < 0)
3961 return ret;
3962 }
3963
3964 return 0;
3965 }
3966
3967 int iscsi_target_tx_thread(void *arg)
3968 {
3969 int ret = 0;
3970 struct iscsi_conn *conn = arg;
3971 /*
3972 * Allow ourselves to be interrupted by SIGINT so that a
3973 * connection recovery / failure event can be triggered externally.
3974 */
3975 allow_signal(SIGINT);
3976
3977 while (!kthread_should_stop()) {
3978 /*
3979 * Ensure that both TX and RX per connection kthreads
3980 * are scheduled to run on the same CPU.
3981 */
3982 iscsit_thread_check_cpumask(conn, current, 1);
3983
3984 wait_event_interruptible(conn->queues_wq,
3985 !iscsit_conn_all_queues_empty(conn));
3986
3987 if (signal_pending(current))
3988 goto transport_err;
3989
3990 get_immediate:
3991 ret = iscsit_handle_immediate_queue(conn);
3992 if (ret < 0)
3993 goto transport_err;
3994
3995 ret = iscsit_handle_response_queue(conn);
3996 if (ret == 1)
3997 goto get_immediate;
3998 else if (ret == -ECONNRESET)
3999 goto out;
4000 else if (ret < 0)
4001 goto transport_err;
4002 }
4003
4004 transport_err:
4005 iscsit_take_action_for_connection_exit(conn);
4006 out:
4007 return 0;
4008 }
4009
4010 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
4011 {
4012 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
4013 struct iscsi_cmd *cmd;
4014 int ret = 0;
4015
4016 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
4017 case ISCSI_OP_SCSI_CMD:
4018 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4019 if (!cmd)
4020 goto reject;
4021
4022 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
4023 break;
4024 case ISCSI_OP_SCSI_DATA_OUT:
4025 ret = iscsit_handle_data_out(conn, buf);
4026 break;
4027 case ISCSI_OP_NOOP_OUT:
4028 cmd = NULL;
4029 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4030 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4031 if (!cmd)
4032 goto reject;
4033 }
4034 ret = iscsit_handle_nop_out(conn, cmd, buf);
4035 break;
4036 case ISCSI_OP_SCSI_TMFUNC:
4037 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4038 if (!cmd)
4039 goto reject;
4040
4041 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4042 break;
4043 case ISCSI_OP_TEXT:
4044 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4045 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4046 if (!cmd)
4047 goto reject;
4048 } else {
4049 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4050 if (!cmd)
4051 goto reject;
4052 }
4053
4054 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4055 break;
4056 case ISCSI_OP_LOGOUT:
4057 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4058 if (!cmd)
4059 goto reject;
4060
4061 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4062 if (ret > 0)
4063 wait_for_completion_timeout(&conn->conn_logout_comp,
4064 SECONDS_FOR_LOGOUT_COMP * HZ);
4065 break;
4066 case ISCSI_OP_SNACK:
4067 ret = iscsit_handle_snack(conn, buf);
4068 break;
4069 default:
4070 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4071 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4072 pr_err("Cannot recover from unknown"
4073 " opcode while ERL=0, closing iSCSI connection.\n");
4074 return -1;
4075 }
4076 if (!conn->conn_ops->OFMarker) {
4077 pr_err("Unable to recover from unknown"
4078 " opcode while OFMarker=No, closing iSCSI"
4079 " connection.\n");
4080 return -1;
4081 }
4082 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4083 pr_err("Unable to recover from unknown"
4084 " opcode, closing iSCSI connection.\n");
4085 return -1;
4086 }
4087 break;
4088 }
4089
4090 return ret;
4091 reject:
4092 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4093 }
4094
4095 int iscsi_target_rx_thread(void *arg)
4096 {
4097 int ret;
4098 u8 buffer[ISCSI_HDR_LEN], opcode;
4099 u32 checksum = 0, digest = 0;
4100 struct iscsi_conn *conn = arg;
4101 struct kvec iov;
4102 /*
4103 * Allow ourselves to be interrupted by SIGINT so that a
4104 * connection recovery / failure event can be triggered externally.
4105 */
4106 allow_signal(SIGINT);
4107
4108 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4109 struct completion comp;
4110 int rc;
4111
4112 init_completion(&comp);
4113 rc = wait_for_completion_interruptible(&comp);
4114 if (rc < 0)
4115 goto transport_err;
4116
4117 goto transport_err;
4118 }
4119
4120 while (!kthread_should_stop()) {
4121 /*
4122 * Ensure that both TX and RX per connection kthreads
4123 * are scheduled to run on the same CPU.
4124 */
4125 iscsit_thread_check_cpumask(conn, current, 0);
4126
4127 memset(buffer, 0, ISCSI_HDR_LEN);
4128 memset(&iov, 0, sizeof(struct kvec));
4129
4130 iov.iov_base = buffer;
4131 iov.iov_len = ISCSI_HDR_LEN;
4132
4133 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4134 if (ret != ISCSI_HDR_LEN) {
4135 iscsit_rx_thread_wait_for_tcp(conn);
4136 goto transport_err;
4137 }
4138
4139 if (conn->conn_ops->HeaderDigest) {
4140 iov.iov_base = &digest;
4141 iov.iov_len = ISCSI_CRC_LEN;
4142
4143 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4144 if (ret != ISCSI_CRC_LEN) {
4145 iscsit_rx_thread_wait_for_tcp(conn);
4146 goto transport_err;
4147 }
4148
4149 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4150 buffer, ISCSI_HDR_LEN,
4151 0, NULL, (u8 *)&checksum);
4152
4153 if (digest != checksum) {
4154 pr_err("HeaderDigest CRC32C failed,"
4155 " received 0x%08x, computed 0x%08x\n",
4156 digest, checksum);
4157 /*
4158 * Set the PDU to 0xff so it will intentionally
4159 * hit default in the switch below.
4160 */
4161 memset(buffer, 0xff, ISCSI_HDR_LEN);
4162 atomic_long_inc(&conn->sess->conn_digest_errors);
4163 } else {
4164 pr_debug("Got HeaderDigest CRC32C"
4165 " 0x%08x\n", checksum);
4166 }
4167 }
4168
4169 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4170 goto transport_err;
4171
4172 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4173
4174 if (conn->sess->sess_ops->SessionType &&
4175 ((!(opcode & ISCSI_OP_TEXT)) ||
4176 (!(opcode & ISCSI_OP_LOGOUT)))) {
4177 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4178 " while in Discovery Session, rejecting.\n", opcode);
4179 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4180 buffer);
4181 goto transport_err;
4182 }
4183
4184 ret = iscsi_target_rx_opcode(conn, buffer);
4185 if (ret < 0)
4186 goto transport_err;
4187 }
4188
4189 transport_err:
4190 if (!signal_pending(current))
4191 atomic_set(&conn->transport_failed, 1);
4192 iscsit_take_action_for_connection_exit(conn);
4193 return 0;
4194 }
4195
4196 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4197 {
4198 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4199 struct iscsi_session *sess = conn->sess;
4200 /*
4201 * We expect this function to only ever be called from either RX or TX
4202 * thread context via iscsit_close_connection() once the other context
4203 * has been reset -> returned sleeping pre-handler state.
4204 */
4205 spin_lock_bh(&conn->cmd_lock);
4206 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4207
4208 list_del_init(&cmd->i_conn_node);
4209 spin_unlock_bh(&conn->cmd_lock);
4210
4211 iscsit_increment_maxcmdsn(cmd, sess);
4212
4213 iscsit_free_cmd(cmd, true);
4214
4215 spin_lock_bh(&conn->cmd_lock);
4216 }
4217 spin_unlock_bh(&conn->cmd_lock);
4218 }
4219
4220 static void iscsit_stop_timers_for_cmds(
4221 struct iscsi_conn *conn)
4222 {
4223 struct iscsi_cmd *cmd;
4224
4225 spin_lock_bh(&conn->cmd_lock);
4226 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4227 if (cmd->data_direction == DMA_TO_DEVICE)
4228 iscsit_stop_dataout_timer(cmd);
4229 }
4230 spin_unlock_bh(&conn->cmd_lock);
4231 }
4232
4233 int iscsit_close_connection(
4234 struct iscsi_conn *conn)
4235 {
4236 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4237 struct iscsi_session *sess = conn->sess;
4238
4239 pr_debug("Closing iSCSI connection CID %hu on SID:"
4240 " %u\n", conn->cid, sess->sid);
4241 /*
4242 * Always up conn_logout_comp for the traditional TCP case just in case
4243 * the RX Thread in iscsi_target_rx_opcode() is sleeping and the logout
4244 * response never got sent because the connection failed.
4245 *
4246 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4247 * to signal logout response TX interrupt completion. Go ahead and skip
4248 * this for iser since isert_rx_opcode() does not wait on logout failure,
4249 * and to avoid iscsi_conn pointer dereference in iser-target code.
4250 */
4251 if (conn->conn_transport->transport_type == ISCSI_TCP)
4252 complete(&conn->conn_logout_comp);
4253
4254 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4255 if (conn->tx_thread &&
4256 cmpxchg(&conn->tx_thread_active, true, false)) {
4257 send_sig(SIGINT, conn->tx_thread, 1);
4258 kthread_stop(conn->tx_thread);
4259 }
4260 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4261 if (conn->rx_thread &&
4262 cmpxchg(&conn->rx_thread_active, true, false)) {
4263 send_sig(SIGINT, conn->rx_thread, 1);
4264 kthread_stop(conn->rx_thread);
4265 }
4266 }
4267
4268 spin_lock(&iscsit_global->ts_bitmap_lock);
4269 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4270 get_order(1));
4271 spin_unlock(&iscsit_global->ts_bitmap_lock);
4272
4273 iscsit_stop_timers_for_cmds(conn);
4274 iscsit_stop_nopin_response_timer(conn);
4275 iscsit_stop_nopin_timer(conn);
4276
4277 if (conn->conn_transport->iscsit_wait_conn)
4278 conn->conn_transport->iscsit_wait_conn(conn);
4279
4280 /*
4281 * During Connection recovery drop unacknowledged out of order
4282 * commands for this connection, and prepare the other commands
4283 * for realligence.
4284 *
4285 * During normal operation clear the out of order commands (but
4286 * do not free the struct iscsi_ooo_cmdsn's) and release all
4287 * struct iscsi_cmds.
4288 */
4289 if (atomic_read(&conn->connection_recovery)) {
4290 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4291 iscsit_prepare_cmds_for_realligance(conn);
4292 } else {
4293 iscsit_clear_ooo_cmdsns_for_conn(conn);
4294 iscsit_release_commands_from_conn(conn);
4295 }
4296 iscsit_free_queue_reqs_for_conn(conn);
4297
4298 /*
4299 * Handle decrementing session or connection usage count if
4300 * a logout response was not able to be sent because the
4301 * connection failed. Fall back to Session Recovery here.
4302 */
4303 if (atomic_read(&conn->conn_logout_remove)) {
4304 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4305 iscsit_dec_conn_usage_count(conn);
4306 iscsit_dec_session_usage_count(sess);
4307 }
4308 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4309 iscsit_dec_conn_usage_count(conn);
4310
4311 atomic_set(&conn->conn_logout_remove, 0);
4312 atomic_set(&sess->session_reinstatement, 0);
4313 atomic_set(&sess->session_fall_back_to_erl0, 1);
4314 }
4315
4316 spin_lock_bh(&sess->conn_lock);
4317 list_del(&conn->conn_list);
4318
4319 /*
4320 * Attempt to let the Initiator know this connection failed by
4321 * sending an Connection Dropped Async Message on another
4322 * active connection.
4323 */
4324 if (atomic_read(&conn->connection_recovery))
4325 iscsit_build_conn_drop_async_message(conn);
4326
4327 spin_unlock_bh(&sess->conn_lock);
4328
4329 /*
4330 * If connection reinstatement is being performed on this connection,
4331 * up the connection reinstatement semaphore that is being blocked on
4332 * in iscsit_cause_connection_reinstatement().
4333 */
4334 spin_lock_bh(&conn->state_lock);
4335 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4336 spin_unlock_bh(&conn->state_lock);
4337 complete(&conn->conn_wait_comp);
4338 wait_for_completion(&conn->conn_post_wait_comp);
4339 spin_lock_bh(&conn->state_lock);
4340 }
4341
4342 /*
4343 * If connection reinstatement is being performed on this connection
4344 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4345 * connection wait rcfr semaphore that is being blocked on
4346 * an iscsit_connection_reinstatement_rcfr().
4347 */
4348 if (atomic_read(&conn->connection_wait_rcfr)) {
4349 spin_unlock_bh(&conn->state_lock);
4350 complete(&conn->conn_wait_rcfr_comp);
4351 wait_for_completion(&conn->conn_post_wait_comp);
4352 spin_lock_bh(&conn->state_lock);
4353 }
4354 atomic_set(&conn->connection_reinstatement, 1);
4355 spin_unlock_bh(&conn->state_lock);
4356
4357 /*
4358 * If any other processes are accessing this connection pointer we
4359 * must wait until they have completed.
4360 */
4361 iscsit_check_conn_usage_count(conn);
4362
4363 if (conn->conn_rx_hash.tfm)
4364 crypto_free_hash(conn->conn_rx_hash.tfm);
4365 if (conn->conn_tx_hash.tfm)
4366 crypto_free_hash(conn->conn_tx_hash.tfm);
4367
4368 free_cpumask_var(conn->conn_cpumask);
4369
4370 kfree(conn->conn_ops);
4371 conn->conn_ops = NULL;
4372
4373 if (conn->sock)
4374 sock_release(conn->sock);
4375
4376 if (conn->conn_transport->iscsit_free_conn)
4377 conn->conn_transport->iscsit_free_conn(conn);
4378
4379 iscsit_put_transport(conn->conn_transport);
4380
4381 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4382 conn->conn_state = TARG_CONN_STATE_FREE;
4383 kfree(conn);
4384
4385 spin_lock_bh(&sess->conn_lock);
4386 atomic_dec(&sess->nconn);
4387 pr_debug("Decremented iSCSI connection count to %hu from node:"
4388 " %s\n", atomic_read(&sess->nconn),
4389 sess->sess_ops->InitiatorName);
4390 /*
4391 * Make sure that if one connection fails in an non ERL=2 iSCSI
4392 * Session that they all fail.
4393 */
4394 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4395 !atomic_read(&sess->session_logout))
4396 atomic_set(&sess->session_fall_back_to_erl0, 1);
4397
4398 /*
4399 * If this was not the last connection in the session, and we are
4400 * performing session reinstatement or falling back to ERL=0, call
4401 * iscsit_stop_session() without sleeping to shutdown the other
4402 * active connections.
4403 */
4404 if (atomic_read(&sess->nconn)) {
4405 if (!atomic_read(&sess->session_reinstatement) &&
4406 !atomic_read(&sess->session_fall_back_to_erl0)) {
4407 spin_unlock_bh(&sess->conn_lock);
4408 return 0;
4409 }
4410 if (!atomic_read(&sess->session_stop_active)) {
4411 atomic_set(&sess->session_stop_active, 1);
4412 spin_unlock_bh(&sess->conn_lock);
4413 iscsit_stop_session(sess, 0, 0);
4414 return 0;
4415 }
4416 spin_unlock_bh(&sess->conn_lock);
4417 return 0;
4418 }
4419
4420 /*
4421 * If this was the last connection in the session and one of the
4422 * following is occurring:
4423 *
4424 * Session Reinstatement is not being performed, and are falling back
4425 * to ERL=0 call iscsit_close_session().
4426 *
4427 * Session Logout was requested. iscsit_close_session() will be called
4428 * elsewhere.
4429 *
4430 * Session Continuation is not being performed, start the Time2Retain
4431 * handler and check if sleep_on_sess_wait_sem is active.
4432 */
4433 if (!atomic_read(&sess->session_reinstatement) &&
4434 atomic_read(&sess->session_fall_back_to_erl0)) {
4435 spin_unlock_bh(&sess->conn_lock);
4436 target_put_session(sess->se_sess);
4437
4438 return 0;
4439 } else if (atomic_read(&sess->session_logout)) {
4440 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4441 sess->session_state = TARG_SESS_STATE_FREE;
4442 spin_unlock_bh(&sess->conn_lock);
4443
4444 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4445 complete(&sess->session_wait_comp);
4446
4447 return 0;
4448 } else {
4449 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4450 sess->session_state = TARG_SESS_STATE_FAILED;
4451
4452 if (!atomic_read(&sess->session_continuation)) {
4453 spin_unlock_bh(&sess->conn_lock);
4454 iscsit_start_time2retain_handler(sess);
4455 } else
4456 spin_unlock_bh(&sess->conn_lock);
4457
4458 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4459 complete(&sess->session_wait_comp);
4460
4461 return 0;
4462 }
4463 spin_unlock_bh(&sess->conn_lock);
4464
4465 return 0;
4466 }
4467
4468 int iscsit_close_session(struct iscsi_session *sess)
4469 {
4470 struct iscsi_portal_group *tpg = sess->tpg;
4471 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4472
4473 if (atomic_read(&sess->nconn)) {
4474 pr_err("%d connection(s) still exist for iSCSI session"
4475 " to %s\n", atomic_read(&sess->nconn),
4476 sess->sess_ops->InitiatorName);
4477 BUG();
4478 }
4479
4480 spin_lock_bh(&se_tpg->session_lock);
4481 atomic_set(&sess->session_logout, 1);
4482 atomic_set(&sess->session_reinstatement, 1);
4483 iscsit_stop_time2retain_timer(sess);
4484 spin_unlock_bh(&se_tpg->session_lock);
4485
4486 /*
4487 * transport_deregister_session_configfs() will clear the
4488 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4489 * can be setting it again with __transport_register_session() in
4490 * iscsi_post_login_handler() again after the iscsit_stop_session()
4491 * completes in iscsi_np context.
4492 */
4493 transport_deregister_session_configfs(sess->se_sess);
4494
4495 /*
4496 * If any other processes are accessing this session pointer we must
4497 * wait until they have completed. If we are in an interrupt (the
4498 * time2retain handler) and contain and active session usage count we
4499 * restart the timer and exit.
4500 */
4501 if (!in_interrupt()) {
4502 if (iscsit_check_session_usage_count(sess) == 1)
4503 iscsit_stop_session(sess, 1, 1);
4504 } else {
4505 if (iscsit_check_session_usage_count(sess) == 2) {
4506 atomic_set(&sess->session_logout, 0);
4507 iscsit_start_time2retain_handler(sess);
4508 return 0;
4509 }
4510 }
4511
4512 transport_deregister_session(sess->se_sess);
4513
4514 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4515 iscsit_free_connection_recovery_entires(sess);
4516
4517 iscsit_free_all_ooo_cmdsns(sess);
4518
4519 spin_lock_bh(&se_tpg->session_lock);
4520 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4521 sess->session_state = TARG_SESS_STATE_FREE;
4522 pr_debug("Released iSCSI session from node: %s\n",
4523 sess->sess_ops->InitiatorName);
4524 tpg->nsessions--;
4525 if (tpg->tpg_tiqn)
4526 tpg->tpg_tiqn->tiqn_nsessions--;
4527
4528 pr_debug("Decremented number of active iSCSI Sessions on"
4529 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4530
4531 spin_lock(&sess_idr_lock);
4532 idr_remove(&sess_idr, sess->session_index);
4533 spin_unlock(&sess_idr_lock);
4534
4535 kfree(sess->sess_ops);
4536 sess->sess_ops = NULL;
4537 spin_unlock_bh(&se_tpg->session_lock);
4538
4539 kfree(sess);
4540 return 0;
4541 }
4542
4543 static void iscsit_logout_post_handler_closesession(
4544 struct iscsi_conn *conn)
4545 {
4546 struct iscsi_session *sess = conn->sess;
4547 int sleep = cmpxchg(&conn->tx_thread_active, true, false);
4548
4549 atomic_set(&conn->conn_logout_remove, 0);
4550 complete(&conn->conn_logout_comp);
4551
4552 iscsit_dec_conn_usage_count(conn);
4553 iscsit_stop_session(sess, sleep, sleep);
4554 iscsit_dec_session_usage_count(sess);
4555 target_put_session(sess->se_sess);
4556 }
4557
4558 static void iscsit_logout_post_handler_samecid(
4559 struct iscsi_conn *conn)
4560 {
4561 int sleep = cmpxchg(&conn->tx_thread_active, true, false);
4562
4563 atomic_set(&conn->conn_logout_remove, 0);
4564 complete(&conn->conn_logout_comp);
4565
4566 iscsit_cause_connection_reinstatement(conn, sleep);
4567 iscsit_dec_conn_usage_count(conn);
4568 }
4569
4570 static void iscsit_logout_post_handler_diffcid(
4571 struct iscsi_conn *conn,
4572 u16 cid)
4573 {
4574 struct iscsi_conn *l_conn;
4575 struct iscsi_session *sess = conn->sess;
4576 bool conn_found = false;
4577
4578 if (!sess)
4579 return;
4580
4581 spin_lock_bh(&sess->conn_lock);
4582 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4583 if (l_conn->cid == cid) {
4584 iscsit_inc_conn_usage_count(l_conn);
4585 conn_found = true;
4586 break;
4587 }
4588 }
4589 spin_unlock_bh(&sess->conn_lock);
4590
4591 if (!conn_found)
4592 return;
4593
4594 if (l_conn->sock)
4595 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4596
4597 spin_lock_bh(&l_conn->state_lock);
4598 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4599 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4600 spin_unlock_bh(&l_conn->state_lock);
4601
4602 iscsit_cause_connection_reinstatement(l_conn, 1);
4603 iscsit_dec_conn_usage_count(l_conn);
4604 }
4605
4606 /*
4607 * Return of 0 causes the TX thread to restart.
4608 */
4609 int iscsit_logout_post_handler(
4610 struct iscsi_cmd *cmd,
4611 struct iscsi_conn *conn)
4612 {
4613 int ret = 0;
4614
4615 switch (cmd->logout_reason) {
4616 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4617 switch (cmd->logout_response) {
4618 case ISCSI_LOGOUT_SUCCESS:
4619 case ISCSI_LOGOUT_CLEANUP_FAILED:
4620 default:
4621 iscsit_logout_post_handler_closesession(conn);
4622 break;
4623 }
4624 ret = 0;
4625 break;
4626 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4627 if (conn->cid == cmd->logout_cid) {
4628 switch (cmd->logout_response) {
4629 case ISCSI_LOGOUT_SUCCESS:
4630 case ISCSI_LOGOUT_CLEANUP_FAILED:
4631 default:
4632 iscsit_logout_post_handler_samecid(conn);
4633 break;
4634 }
4635 ret = 0;
4636 } else {
4637 switch (cmd->logout_response) {
4638 case ISCSI_LOGOUT_SUCCESS:
4639 iscsit_logout_post_handler_diffcid(conn,
4640 cmd->logout_cid);
4641 break;
4642 case ISCSI_LOGOUT_CID_NOT_FOUND:
4643 case ISCSI_LOGOUT_CLEANUP_FAILED:
4644 default:
4645 break;
4646 }
4647 ret = 1;
4648 }
4649 break;
4650 case ISCSI_LOGOUT_REASON_RECOVERY:
4651 switch (cmd->logout_response) {
4652 case ISCSI_LOGOUT_SUCCESS:
4653 case ISCSI_LOGOUT_CID_NOT_FOUND:
4654 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4655 case ISCSI_LOGOUT_CLEANUP_FAILED:
4656 default:
4657 break;
4658 }
4659 ret = 1;
4660 break;
4661 default:
4662 break;
4663
4664 }
4665 return ret;
4666 }
4667 EXPORT_SYMBOL(iscsit_logout_post_handler);
4668
4669 void iscsit_fail_session(struct iscsi_session *sess)
4670 {
4671 struct iscsi_conn *conn;
4672
4673 spin_lock_bh(&sess->conn_lock);
4674 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4675 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4676 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4677 }
4678 spin_unlock_bh(&sess->conn_lock);
4679
4680 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4681 sess->session_state = TARG_SESS_STATE_FAILED;
4682 }
4683
4684 int iscsit_free_session(struct iscsi_session *sess)
4685 {
4686 u16 conn_count = atomic_read(&sess->nconn);
4687 struct iscsi_conn *conn, *conn_tmp = NULL;
4688 int is_last;
4689
4690 spin_lock_bh(&sess->conn_lock);
4691 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4692
4693 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4694 conn_list) {
4695 if (conn_count == 0)
4696 break;
4697
4698 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4699 is_last = 1;
4700 } else {
4701 iscsit_inc_conn_usage_count(conn_tmp);
4702 is_last = 0;
4703 }
4704 iscsit_inc_conn_usage_count(conn);
4705
4706 spin_unlock_bh(&sess->conn_lock);
4707 iscsit_cause_connection_reinstatement(conn, 1);
4708 spin_lock_bh(&sess->conn_lock);
4709
4710 iscsit_dec_conn_usage_count(conn);
4711 if (is_last == 0)
4712 iscsit_dec_conn_usage_count(conn_tmp);
4713
4714 conn_count--;
4715 }
4716
4717 if (atomic_read(&sess->nconn)) {
4718 spin_unlock_bh(&sess->conn_lock);
4719 wait_for_completion(&sess->session_wait_comp);
4720 } else
4721 spin_unlock_bh(&sess->conn_lock);
4722
4723 target_put_session(sess->se_sess);
4724 return 0;
4725 }
4726
4727 void iscsit_stop_session(
4728 struct iscsi_session *sess,
4729 int session_sleep,
4730 int connection_sleep)
4731 {
4732 u16 conn_count = atomic_read(&sess->nconn);
4733 struct iscsi_conn *conn, *conn_tmp = NULL;
4734 int is_last;
4735
4736 spin_lock_bh(&sess->conn_lock);
4737 if (session_sleep)
4738 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4739
4740 if (connection_sleep) {
4741 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4742 conn_list) {
4743 if (conn_count == 0)
4744 break;
4745
4746 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4747 is_last = 1;
4748 } else {
4749 iscsit_inc_conn_usage_count(conn_tmp);
4750 is_last = 0;
4751 }
4752 iscsit_inc_conn_usage_count(conn);
4753
4754 spin_unlock_bh(&sess->conn_lock);
4755 iscsit_cause_connection_reinstatement(conn, 1);
4756 spin_lock_bh(&sess->conn_lock);
4757
4758 iscsit_dec_conn_usage_count(conn);
4759 if (is_last == 0)
4760 iscsit_dec_conn_usage_count(conn_tmp);
4761 conn_count--;
4762 }
4763 } else {
4764 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4765 iscsit_cause_connection_reinstatement(conn, 0);
4766 }
4767
4768 if (session_sleep && atomic_read(&sess->nconn)) {
4769 spin_unlock_bh(&sess->conn_lock);
4770 wait_for_completion(&sess->session_wait_comp);
4771 } else
4772 spin_unlock_bh(&sess->conn_lock);
4773 }
4774
4775 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4776 {
4777 struct iscsi_session *sess;
4778 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4779 struct se_session *se_sess, *se_sess_tmp;
4780 int session_count = 0;
4781
4782 spin_lock_bh(&se_tpg->session_lock);
4783 if (tpg->nsessions && !force) {
4784 spin_unlock_bh(&se_tpg->session_lock);
4785 return -1;
4786 }
4787
4788 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4789 sess_list) {
4790 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4791
4792 spin_lock(&sess->conn_lock);
4793 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4794 atomic_read(&sess->session_logout) ||
4795 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4796 spin_unlock(&sess->conn_lock);
4797 continue;
4798 }
4799 atomic_set(&sess->session_reinstatement, 1);
4800 spin_unlock(&sess->conn_lock);
4801 spin_unlock_bh(&se_tpg->session_lock);
4802
4803 iscsit_free_session(sess);
4804 spin_lock_bh(&se_tpg->session_lock);
4805
4806 session_count++;
4807 }
4808 spin_unlock_bh(&se_tpg->session_lock);
4809
4810 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4811 " Group: %hu\n", session_count, tpg->tpgt);
4812 return 0;
4813 }
4814
4815 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4816 MODULE_VERSION("4.1.x");
4817 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4818 MODULE_LICENSE("GPL");
4819
4820 module_init(iscsi_target_init_module);
4821 module_exit(iscsi_target_cleanup_module);
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