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[mirror_ubuntu-bionic-kernel.git] / drivers / target / iscsi / iscsi_target.c
1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
5 *
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
7 *
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
20
21 #include <linux/string.h>
22 #include <linux/kthread.h>
23 #include <linux/crypto.h>
24 #include <linux/completion.h>
25 #include <linux/module.h>
26 #include <linux/idr.h>
27 #include <asm/unaligned.h>
28 #include <scsi/scsi_device.h>
29 #include <scsi/iscsi_proto.h>
30 #include <scsi/scsi_tcq.h>
31 #include <target/target_core_base.h>
32 #include <target/target_core_fabric.h>
33 #include <target/target_core_configfs.h>
34
35 #include "iscsi_target_core.h"
36 #include "iscsi_target_parameters.h"
37 #include "iscsi_target_seq_pdu_list.h"
38 #include "iscsi_target_tq.h"
39 #include "iscsi_target_configfs.h"
40 #include "iscsi_target_datain_values.h"
41 #include "iscsi_target_erl0.h"
42 #include "iscsi_target_erl1.h"
43 #include "iscsi_target_erl2.h"
44 #include "iscsi_target_login.h"
45 #include "iscsi_target_tmr.h"
46 #include "iscsi_target_tpg.h"
47 #include "iscsi_target_util.h"
48 #include "iscsi_target.h"
49 #include "iscsi_target_device.h"
50 #include "iscsi_target_stat.h"
51
52 static LIST_HEAD(g_tiqn_list);
53 static LIST_HEAD(g_np_list);
54 static DEFINE_SPINLOCK(tiqn_lock);
55 static DEFINE_SPINLOCK(np_lock);
56
57 static struct idr tiqn_idr;
58 struct idr sess_idr;
59 struct mutex auth_id_lock;
60 spinlock_t sess_idr_lock;
61
62 struct iscsit_global *iscsit_global;
63
64 struct kmem_cache *lio_cmd_cache;
65 struct kmem_cache *lio_qr_cache;
66 struct kmem_cache *lio_dr_cache;
67 struct kmem_cache *lio_ooo_cache;
68 struct kmem_cache *lio_r2t_cache;
69
70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
71 unsigned char *buf, u32);
72 static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
73
74 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
75 {
76 struct iscsi_tiqn *tiqn = NULL;
77
78 spin_lock(&tiqn_lock);
79 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
80 if (!strcmp(tiqn->tiqn, buf)) {
81
82 spin_lock(&tiqn->tiqn_state_lock);
83 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
84 tiqn->tiqn_access_count++;
85 spin_unlock(&tiqn->tiqn_state_lock);
86 spin_unlock(&tiqn_lock);
87 return tiqn;
88 }
89 spin_unlock(&tiqn->tiqn_state_lock);
90 }
91 }
92 spin_unlock(&tiqn_lock);
93
94 return NULL;
95 }
96
97 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
98 {
99 spin_lock(&tiqn->tiqn_state_lock);
100 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
101 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
102 spin_unlock(&tiqn->tiqn_state_lock);
103 return 0;
104 }
105 spin_unlock(&tiqn->tiqn_state_lock);
106
107 return -1;
108 }
109
110 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
111 {
112 spin_lock(&tiqn->tiqn_state_lock);
113 tiqn->tiqn_access_count--;
114 spin_unlock(&tiqn->tiqn_state_lock);
115 }
116
117 /*
118 * Note that IQN formatting is expected to be done in userspace, and
119 * no explict IQN format checks are done here.
120 */
121 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
122 {
123 struct iscsi_tiqn *tiqn = NULL;
124 int ret;
125
126 if (strlen(buf) >= ISCSI_IQN_LEN) {
127 pr_err("Target IQN exceeds %d bytes\n",
128 ISCSI_IQN_LEN);
129 return ERR_PTR(-EINVAL);
130 }
131
132 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
133 if (!tiqn) {
134 pr_err("Unable to allocate struct iscsi_tiqn\n");
135 return ERR_PTR(-ENOMEM);
136 }
137
138 sprintf(tiqn->tiqn, "%s", buf);
139 INIT_LIST_HEAD(&tiqn->tiqn_list);
140 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
141 spin_lock_init(&tiqn->tiqn_state_lock);
142 spin_lock_init(&tiqn->tiqn_tpg_lock);
143 spin_lock_init(&tiqn->sess_err_stats.lock);
144 spin_lock_init(&tiqn->login_stats.lock);
145 spin_lock_init(&tiqn->logout_stats.lock);
146
147 if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) {
148 pr_err("idr_pre_get() for tiqn_idr failed\n");
149 kfree(tiqn);
150 return ERR_PTR(-ENOMEM);
151 }
152 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
153
154 spin_lock(&tiqn_lock);
155 ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index);
156 if (ret < 0) {
157 pr_err("idr_get_new() failed for tiqn->tiqn_index\n");
158 spin_unlock(&tiqn_lock);
159 kfree(tiqn);
160 return ERR_PTR(ret);
161 }
162 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
163 spin_unlock(&tiqn_lock);
164
165 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
166
167 return tiqn;
168
169 }
170
171 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
172 {
173 /*
174 * Wait for accesses to said struct iscsi_tiqn to end.
175 */
176 spin_lock(&tiqn->tiqn_state_lock);
177 while (tiqn->tiqn_access_count != 0) {
178 spin_unlock(&tiqn->tiqn_state_lock);
179 msleep(10);
180 spin_lock(&tiqn->tiqn_state_lock);
181 }
182 spin_unlock(&tiqn->tiqn_state_lock);
183 }
184
185 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
186 {
187 /*
188 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
189 * while holding tiqn->tiqn_state_lock. This means that all subsequent
190 * attempts to access this struct iscsi_tiqn will fail from both transport
191 * fabric and control code paths.
192 */
193 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
194 pr_err("iscsit_set_tiqn_shutdown() failed\n");
195 return;
196 }
197
198 iscsit_wait_for_tiqn(tiqn);
199
200 spin_lock(&tiqn_lock);
201 list_del(&tiqn->tiqn_list);
202 idr_remove(&tiqn_idr, tiqn->tiqn_index);
203 spin_unlock(&tiqn_lock);
204
205 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
206 tiqn->tiqn);
207 kfree(tiqn);
208 }
209
210 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
211 {
212 int ret;
213 /*
214 * Determine if the network portal is accepting storage traffic.
215 */
216 spin_lock_bh(&np->np_thread_lock);
217 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
218 spin_unlock_bh(&np->np_thread_lock);
219 return -1;
220 }
221 if (np->np_login_tpg) {
222 pr_err("np->np_login_tpg() is not NULL!\n");
223 spin_unlock_bh(&np->np_thread_lock);
224 return -1;
225 }
226 spin_unlock_bh(&np->np_thread_lock);
227 /*
228 * Determine if the portal group is accepting storage traffic.
229 */
230 spin_lock_bh(&tpg->tpg_state_lock);
231 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
232 spin_unlock_bh(&tpg->tpg_state_lock);
233 return -1;
234 }
235 spin_unlock_bh(&tpg->tpg_state_lock);
236
237 /*
238 * Here we serialize access across the TIQN+TPG Tuple.
239 */
240 ret = mutex_lock_interruptible(&tpg->np_login_lock);
241 if ((ret != 0) || signal_pending(current))
242 return -1;
243
244 spin_lock_bh(&np->np_thread_lock);
245 np->np_login_tpg = tpg;
246 spin_unlock_bh(&np->np_thread_lock);
247
248 return 0;
249 }
250
251 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
252 {
253 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
254
255 spin_lock_bh(&np->np_thread_lock);
256 np->np_login_tpg = NULL;
257 spin_unlock_bh(&np->np_thread_lock);
258
259 mutex_unlock(&tpg->np_login_lock);
260
261 if (tiqn)
262 iscsit_put_tiqn_for_login(tiqn);
263
264 return 0;
265 }
266
267 static struct iscsi_np *iscsit_get_np(
268 struct __kernel_sockaddr_storage *sockaddr,
269 int network_transport)
270 {
271 struct sockaddr_in *sock_in, *sock_in_e;
272 struct sockaddr_in6 *sock_in6, *sock_in6_e;
273 struct iscsi_np *np;
274 int ip_match = 0;
275 u16 port;
276
277 spin_lock_bh(&np_lock);
278 list_for_each_entry(np, &g_np_list, np_list) {
279 spin_lock(&np->np_thread_lock);
280 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
281 spin_unlock(&np->np_thread_lock);
282 continue;
283 }
284
285 if (sockaddr->ss_family == AF_INET6) {
286 sock_in6 = (struct sockaddr_in6 *)sockaddr;
287 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
288
289 if (!memcmp(&sock_in6->sin6_addr.in6_u,
290 &sock_in6_e->sin6_addr.in6_u,
291 sizeof(struct in6_addr)))
292 ip_match = 1;
293
294 port = ntohs(sock_in6->sin6_port);
295 } else {
296 sock_in = (struct sockaddr_in *)sockaddr;
297 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
298
299 if (sock_in->sin_addr.s_addr ==
300 sock_in_e->sin_addr.s_addr)
301 ip_match = 1;
302
303 port = ntohs(sock_in->sin_port);
304 }
305
306 if ((ip_match == 1) && (np->np_port == port) &&
307 (np->np_network_transport == network_transport)) {
308 /*
309 * Increment the np_exports reference count now to
310 * prevent iscsit_del_np() below from being called
311 * while iscsi_tpg_add_network_portal() is called.
312 */
313 np->np_exports++;
314 spin_unlock(&np->np_thread_lock);
315 spin_unlock_bh(&np_lock);
316 return np;
317 }
318 spin_unlock(&np->np_thread_lock);
319 }
320 spin_unlock_bh(&np_lock);
321
322 return NULL;
323 }
324
325 struct iscsi_np *iscsit_add_np(
326 struct __kernel_sockaddr_storage *sockaddr,
327 char *ip_str,
328 int network_transport)
329 {
330 struct sockaddr_in *sock_in;
331 struct sockaddr_in6 *sock_in6;
332 struct iscsi_np *np;
333 int ret;
334 /*
335 * Locate the existing struct iscsi_np if already active..
336 */
337 np = iscsit_get_np(sockaddr, network_transport);
338 if (np)
339 return np;
340
341 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
342 if (!np) {
343 pr_err("Unable to allocate memory for struct iscsi_np\n");
344 return ERR_PTR(-ENOMEM);
345 }
346
347 np->np_flags |= NPF_IP_NETWORK;
348 if (sockaddr->ss_family == AF_INET6) {
349 sock_in6 = (struct sockaddr_in6 *)sockaddr;
350 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
351 np->np_port = ntohs(sock_in6->sin6_port);
352 } else {
353 sock_in = (struct sockaddr_in *)sockaddr;
354 sprintf(np->np_ip, "%s", ip_str);
355 np->np_port = ntohs(sock_in->sin_port);
356 }
357
358 np->np_network_transport = network_transport;
359 spin_lock_init(&np->np_thread_lock);
360 init_completion(&np->np_restart_comp);
361 INIT_LIST_HEAD(&np->np_list);
362
363 ret = iscsi_target_setup_login_socket(np, sockaddr);
364 if (ret != 0) {
365 kfree(np);
366 return ERR_PTR(ret);
367 }
368
369 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
370 if (IS_ERR(np->np_thread)) {
371 pr_err("Unable to create kthread: iscsi_np\n");
372 ret = PTR_ERR(np->np_thread);
373 kfree(np);
374 return ERR_PTR(ret);
375 }
376 /*
377 * Increment the np_exports reference count now to prevent
378 * iscsit_del_np() below from being run while a new call to
379 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
380 * active. We don't need to hold np->np_thread_lock at this
381 * point because iscsi_np has not been added to g_np_list yet.
382 */
383 np->np_exports = 1;
384
385 spin_lock_bh(&np_lock);
386 list_add_tail(&np->np_list, &g_np_list);
387 spin_unlock_bh(&np_lock);
388
389 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
390 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
391 "TCP" : "SCTP");
392
393 return np;
394 }
395
396 int iscsit_reset_np_thread(
397 struct iscsi_np *np,
398 struct iscsi_tpg_np *tpg_np,
399 struct iscsi_portal_group *tpg)
400 {
401 spin_lock_bh(&np->np_thread_lock);
402 if (tpg && tpg_np) {
403 /*
404 * The reset operation need only be performed when the
405 * passed struct iscsi_portal_group has a login in progress
406 * to one of the network portals.
407 */
408 if (tpg_np->tpg_np->np_login_tpg != tpg) {
409 spin_unlock_bh(&np->np_thread_lock);
410 return 0;
411 }
412 }
413 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
414 spin_unlock_bh(&np->np_thread_lock);
415 return 0;
416 }
417 np->np_thread_state = ISCSI_NP_THREAD_RESET;
418
419 if (np->np_thread) {
420 spin_unlock_bh(&np->np_thread_lock);
421 send_sig(SIGINT, np->np_thread, 1);
422 wait_for_completion(&np->np_restart_comp);
423 spin_lock_bh(&np->np_thread_lock);
424 }
425 spin_unlock_bh(&np->np_thread_lock);
426
427 return 0;
428 }
429
430 static int iscsit_del_np_comm(struct iscsi_np *np)
431 {
432 if (np->np_socket)
433 sock_release(np->np_socket);
434 return 0;
435 }
436
437 int iscsit_del_np(struct iscsi_np *np)
438 {
439 spin_lock_bh(&np->np_thread_lock);
440 np->np_exports--;
441 if (np->np_exports) {
442 spin_unlock_bh(&np->np_thread_lock);
443 return 0;
444 }
445 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
446 spin_unlock_bh(&np->np_thread_lock);
447
448 if (np->np_thread) {
449 /*
450 * We need to send the signal to wakeup Linux/Net
451 * which may be sleeping in sock_accept()..
452 */
453 send_sig(SIGINT, np->np_thread, 1);
454 kthread_stop(np->np_thread);
455 }
456 iscsit_del_np_comm(np);
457
458 spin_lock_bh(&np_lock);
459 list_del(&np->np_list);
460 spin_unlock_bh(&np_lock);
461
462 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
463 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
464 "TCP" : "SCTP");
465
466 kfree(np);
467 return 0;
468 }
469
470 static int __init iscsi_target_init_module(void)
471 {
472 int ret = 0;
473
474 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
475
476 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
477 if (!iscsit_global) {
478 pr_err("Unable to allocate memory for iscsit_global\n");
479 return -1;
480 }
481 mutex_init(&auth_id_lock);
482 spin_lock_init(&sess_idr_lock);
483 idr_init(&tiqn_idr);
484 idr_init(&sess_idr);
485
486 ret = iscsi_target_register_configfs();
487 if (ret < 0)
488 goto out;
489
490 ret = iscsi_thread_set_init();
491 if (ret < 0)
492 goto configfs_out;
493
494 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
495 TARGET_THREAD_SET_COUNT) {
496 pr_err("iscsi_allocate_thread_sets() returned"
497 " unexpected value!\n");
498 goto ts_out1;
499 }
500
501 lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
502 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
503 0, NULL);
504 if (!lio_cmd_cache) {
505 pr_err("Unable to kmem_cache_create() for"
506 " lio_cmd_cache\n");
507 goto ts_out2;
508 }
509
510 lio_qr_cache = kmem_cache_create("lio_qr_cache",
511 sizeof(struct iscsi_queue_req),
512 __alignof__(struct iscsi_queue_req), 0, NULL);
513 if (!lio_qr_cache) {
514 pr_err("nable to kmem_cache_create() for"
515 " lio_qr_cache\n");
516 goto cmd_out;
517 }
518
519 lio_dr_cache = kmem_cache_create("lio_dr_cache",
520 sizeof(struct iscsi_datain_req),
521 __alignof__(struct iscsi_datain_req), 0, NULL);
522 if (!lio_dr_cache) {
523 pr_err("Unable to kmem_cache_create() for"
524 " lio_dr_cache\n");
525 goto qr_out;
526 }
527
528 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
529 sizeof(struct iscsi_ooo_cmdsn),
530 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
531 if (!lio_ooo_cache) {
532 pr_err("Unable to kmem_cache_create() for"
533 " lio_ooo_cache\n");
534 goto dr_out;
535 }
536
537 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
538 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
539 0, NULL);
540 if (!lio_r2t_cache) {
541 pr_err("Unable to kmem_cache_create() for"
542 " lio_r2t_cache\n");
543 goto ooo_out;
544 }
545
546 if (iscsit_load_discovery_tpg() < 0)
547 goto r2t_out;
548
549 return ret;
550 r2t_out:
551 kmem_cache_destroy(lio_r2t_cache);
552 ooo_out:
553 kmem_cache_destroy(lio_ooo_cache);
554 dr_out:
555 kmem_cache_destroy(lio_dr_cache);
556 qr_out:
557 kmem_cache_destroy(lio_qr_cache);
558 cmd_out:
559 kmem_cache_destroy(lio_cmd_cache);
560 ts_out2:
561 iscsi_deallocate_thread_sets();
562 ts_out1:
563 iscsi_thread_set_free();
564 configfs_out:
565 iscsi_target_deregister_configfs();
566 out:
567 kfree(iscsit_global);
568 return -ENOMEM;
569 }
570
571 static void __exit iscsi_target_cleanup_module(void)
572 {
573 iscsi_deallocate_thread_sets();
574 iscsi_thread_set_free();
575 iscsit_release_discovery_tpg();
576 kmem_cache_destroy(lio_cmd_cache);
577 kmem_cache_destroy(lio_qr_cache);
578 kmem_cache_destroy(lio_dr_cache);
579 kmem_cache_destroy(lio_ooo_cache);
580 kmem_cache_destroy(lio_r2t_cache);
581
582 iscsi_target_deregister_configfs();
583
584 kfree(iscsit_global);
585 }
586
587 static int iscsit_add_reject(
588 u8 reason,
589 int fail_conn,
590 unsigned char *buf,
591 struct iscsi_conn *conn)
592 {
593 struct iscsi_cmd *cmd;
594 struct iscsi_reject *hdr;
595 int ret;
596
597 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
598 if (!cmd)
599 return -1;
600
601 cmd->iscsi_opcode = ISCSI_OP_REJECT;
602 if (fail_conn)
603 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
604
605 hdr = (struct iscsi_reject *) cmd->pdu;
606 hdr->reason = reason;
607
608 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
609 if (!cmd->buf_ptr) {
610 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
611 iscsit_release_cmd(cmd);
612 return -1;
613 }
614
615 spin_lock_bh(&conn->cmd_lock);
616 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
617 spin_unlock_bh(&conn->cmd_lock);
618
619 cmd->i_state = ISTATE_SEND_REJECT;
620 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
621
622 ret = wait_for_completion_interruptible(&cmd->reject_comp);
623 if (ret != 0)
624 return -1;
625
626 return (!fail_conn) ? 0 : -1;
627 }
628
629 int iscsit_add_reject_from_cmd(
630 u8 reason,
631 int fail_conn,
632 int add_to_conn,
633 unsigned char *buf,
634 struct iscsi_cmd *cmd)
635 {
636 struct iscsi_conn *conn;
637 struct iscsi_reject *hdr;
638 int ret;
639
640 if (!cmd->conn) {
641 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
642 cmd->init_task_tag);
643 return -1;
644 }
645 conn = cmd->conn;
646
647 cmd->iscsi_opcode = ISCSI_OP_REJECT;
648 if (fail_conn)
649 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
650
651 hdr = (struct iscsi_reject *) cmd->pdu;
652 hdr->reason = reason;
653
654 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
655 if (!cmd->buf_ptr) {
656 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
657 iscsit_release_cmd(cmd);
658 return -1;
659 }
660
661 if (add_to_conn) {
662 spin_lock_bh(&conn->cmd_lock);
663 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
664 spin_unlock_bh(&conn->cmd_lock);
665 }
666
667 cmd->i_state = ISTATE_SEND_REJECT;
668 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
669
670 ret = wait_for_completion_interruptible(&cmd->reject_comp);
671 if (ret != 0)
672 return -1;
673
674 return (!fail_conn) ? 0 : -1;
675 }
676
677 /*
678 * Map some portion of the allocated scatterlist to an iovec, suitable for
679 * kernel sockets to copy data in/out.
680 */
681 static int iscsit_map_iovec(
682 struct iscsi_cmd *cmd,
683 struct kvec *iov,
684 u32 data_offset,
685 u32 data_length)
686 {
687 u32 i = 0;
688 struct scatterlist *sg;
689 unsigned int page_off;
690
691 /*
692 * We know each entry in t_data_sg contains a page.
693 */
694 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
695 page_off = (data_offset % PAGE_SIZE);
696
697 cmd->first_data_sg = sg;
698 cmd->first_data_sg_off = page_off;
699
700 while (data_length) {
701 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
702
703 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
704 iov[i].iov_len = cur_len;
705
706 data_length -= cur_len;
707 page_off = 0;
708 sg = sg_next(sg);
709 i++;
710 }
711
712 cmd->kmapped_nents = i;
713
714 return i;
715 }
716
717 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
718 {
719 u32 i;
720 struct scatterlist *sg;
721
722 sg = cmd->first_data_sg;
723
724 for (i = 0; i < cmd->kmapped_nents; i++)
725 kunmap(sg_page(&sg[i]));
726 }
727
728 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
729 {
730 struct iscsi_cmd *cmd;
731
732 conn->exp_statsn = exp_statsn;
733
734 spin_lock_bh(&conn->cmd_lock);
735 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
736 spin_lock(&cmd->istate_lock);
737 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
738 (cmd->stat_sn < exp_statsn)) {
739 cmd->i_state = ISTATE_REMOVE;
740 spin_unlock(&cmd->istate_lock);
741 iscsit_add_cmd_to_immediate_queue(cmd, conn,
742 cmd->i_state);
743 continue;
744 }
745 spin_unlock(&cmd->istate_lock);
746 }
747 spin_unlock_bh(&conn->cmd_lock);
748 }
749
750 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
751 {
752 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
753
754 iov_count += ISCSI_IOV_DATA_BUFFER;
755
756 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
757 if (!cmd->iov_data) {
758 pr_err("Unable to allocate cmd->iov_data\n");
759 return -ENOMEM;
760 }
761
762 cmd->orig_iov_data_count = iov_count;
763 return 0;
764 }
765
766 static int iscsit_handle_scsi_cmd(
767 struct iscsi_conn *conn,
768 unsigned char *buf)
769 {
770 int data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
771 int dump_immediate_data = 0, send_check_condition = 0, payload_length;
772 struct iscsi_cmd *cmd = NULL;
773 struct iscsi_scsi_req *hdr;
774 int iscsi_task_attr;
775 int sam_task_attr;
776
777 spin_lock_bh(&conn->sess->session_stats_lock);
778 conn->sess->cmd_pdus++;
779 if (conn->sess->se_sess->se_node_acl) {
780 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
781 conn->sess->se_sess->se_node_acl->num_cmds++;
782 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
783 }
784 spin_unlock_bh(&conn->sess->session_stats_lock);
785
786 hdr = (struct iscsi_scsi_req *) buf;
787 payload_length = ntoh24(hdr->dlength);
788
789 /* FIXME; Add checks for AdditionalHeaderSegment */
790
791 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
792 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
793 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
794 " not set. Bad iSCSI Initiator.\n");
795 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
796 buf, conn);
797 }
798
799 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
800 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
801 /*
802 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
803 * that adds support for RESERVE/RELEASE. There is a bug
804 * add with this new functionality that sets R/W bits when
805 * neither CDB carries any READ or WRITE datapayloads.
806 */
807 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
808 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
809 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
810 goto done;
811 }
812
813 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
814 " set when Expected Data Transfer Length is 0 for"
815 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
816 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
817 buf, conn);
818 }
819 done:
820
821 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
822 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
823 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
824 " MUST be set if Expected Data Transfer Length is not 0."
825 " Bad iSCSI Initiator\n");
826 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
827 buf, conn);
828 }
829
830 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
831 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
832 pr_err("Bidirectional operations not supported!\n");
833 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
834 buf, conn);
835 }
836
837 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
838 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
839 " Scsi Command PDU.\n");
840 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
841 buf, conn);
842 }
843
844 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
845 pr_err("ImmediateData=No but DataSegmentLength=%u,"
846 " protocol error.\n", payload_length);
847 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
848 buf, conn);
849 }
850
851 if ((be32_to_cpu(hdr->data_length )== payload_length) &&
852 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
853 pr_err("Expected Data Transfer Length and Length of"
854 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
855 " bit is not set protocol error\n");
856 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
857 buf, conn);
858 }
859
860 if (payload_length > be32_to_cpu(hdr->data_length)) {
861 pr_err("DataSegmentLength: %u is greater than"
862 " EDTL: %u, protocol error.\n", payload_length,
863 hdr->data_length);
864 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
865 buf, conn);
866 }
867
868 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
869 pr_err("DataSegmentLength: %u is greater than"
870 " MaxXmitDataSegmentLength: %u, protocol error.\n",
871 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
872 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
873 buf, conn);
874 }
875
876 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
877 pr_err("DataSegmentLength: %u is greater than"
878 " FirstBurstLength: %u, protocol error.\n",
879 payload_length, conn->sess->sess_ops->FirstBurstLength);
880 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
881 buf, conn);
882 }
883
884 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
885 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
886 DMA_NONE;
887
888 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
889 if (!cmd)
890 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
891 buf, conn);
892
893 cmd->data_direction = data_direction;
894 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
895 /*
896 * Figure out the SAM Task Attribute for the incoming SCSI CDB
897 */
898 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
899 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
900 sam_task_attr = MSG_SIMPLE_TAG;
901 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
902 sam_task_attr = MSG_ORDERED_TAG;
903 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
904 sam_task_attr = MSG_HEAD_TAG;
905 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
906 sam_task_attr = MSG_ACA_TAG;
907 else {
908 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
909 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
910 sam_task_attr = MSG_SIMPLE_TAG;
911 }
912
913 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
914 cmd->i_state = ISTATE_NEW_CMD;
915 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
916 cmd->immediate_data = (payload_length) ? 1 : 0;
917 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
918 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
919 if (cmd->unsolicited_data)
920 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
921
922 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
923 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
924 spin_lock_bh(&conn->sess->ttt_lock);
925 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
926 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
927 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
928 spin_unlock_bh(&conn->sess->ttt_lock);
929 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
930 cmd->targ_xfer_tag = 0xFFFFFFFF;
931 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
932 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
933 cmd->first_burst_len = payload_length;
934
935 if (cmd->data_direction == DMA_FROM_DEVICE) {
936 struct iscsi_datain_req *dr;
937
938 dr = iscsit_allocate_datain_req();
939 if (!dr)
940 return iscsit_add_reject_from_cmd(
941 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
942 1, 1, buf, cmd);
943
944 iscsit_attach_datain_req(cmd, dr);
945 }
946
947 /*
948 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
949 */
950 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
951 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
952 cmd->data_direction, sam_task_attr,
953 cmd->sense_buffer + 2);
954
955 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
956 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
957 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
958
959 /*
960 * The CDB is going to an se_device_t.
961 */
962 ret = transport_lookup_cmd_lun(&cmd->se_cmd,
963 scsilun_to_int(&hdr->lun));
964 if (ret < 0) {
965 if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
966 pr_debug("Responding to non-acl'ed,"
967 " non-existent or non-exported iSCSI LUN:"
968 " 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
969 }
970 send_check_condition = 1;
971 goto attach_cmd;
972 }
973
974 transport_ret = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
975 if (transport_ret == -ENOMEM) {
976 return iscsit_add_reject_from_cmd(
977 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
978 1, 1, buf, cmd);
979 } else if (transport_ret < 0) {
980 /*
981 * Unsupported SAM Opcode. CHECK_CONDITION will be sent
982 * in iscsit_execute_cmd() during the CmdSN OOO Execution
983 * Mechinism.
984 */
985 send_check_condition = 1;
986 } else {
987 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0)
988 return iscsit_add_reject_from_cmd(
989 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
990 1, 1, buf, cmd);
991 }
992
993 attach_cmd:
994 spin_lock_bh(&conn->cmd_lock);
995 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
996 spin_unlock_bh(&conn->cmd_lock);
997 /*
998 * Check if we need to delay processing because of ALUA
999 * Active/NonOptimized primary access state..
1000 */
1001 core_alua_check_nonop_delay(&cmd->se_cmd);
1002
1003 ret = iscsit_allocate_iovecs(cmd);
1004 if (ret < 0)
1005 return iscsit_add_reject_from_cmd(
1006 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1007 1, 0, buf, cmd);
1008 /*
1009 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1010 * the Immediate Bit is not set, and no Immediate
1011 * Data is attached.
1012 *
1013 * A PDU/CmdSN carrying Immediate Data can only
1014 * be processed after the DataCRC has passed.
1015 * If the DataCRC fails, the CmdSN MUST NOT
1016 * be acknowledged. (See below)
1017 */
1018 if (!cmd->immediate_data) {
1019 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1020 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1021 return 0;
1022 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1023 return iscsit_add_reject_from_cmd(
1024 ISCSI_REASON_PROTOCOL_ERROR,
1025 1, 0, buf, cmd);
1026 }
1027
1028 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1029
1030 /*
1031 * If no Immediate Data is attached, it's OK to return now.
1032 */
1033 if (!cmd->immediate_data) {
1034 if (send_check_condition)
1035 return 0;
1036
1037 if (cmd->unsolicited_data) {
1038 iscsit_set_dataout_sequence_values(cmd);
1039
1040 spin_lock_bh(&cmd->dataout_timeout_lock);
1041 iscsit_start_dataout_timer(cmd, cmd->conn);
1042 spin_unlock_bh(&cmd->dataout_timeout_lock);
1043 }
1044
1045 return 0;
1046 }
1047
1048 /*
1049 * Early CHECK_CONDITIONs never make it to the transport processing
1050 * thread. They are processed in CmdSN order by
1051 * iscsit_check_received_cmdsn() below.
1052 */
1053 if (send_check_condition) {
1054 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1055 dump_immediate_data = 1;
1056 goto after_immediate_data;
1057 }
1058 /*
1059 * Call directly into transport_generic_new_cmd() to perform
1060 * the backend memory allocation.
1061 */
1062 ret = transport_generic_new_cmd(&cmd->se_cmd);
1063 if (ret < 0) {
1064 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1065 dump_immediate_data = 1;
1066 goto after_immediate_data;
1067 }
1068
1069 immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1070 after_immediate_data:
1071 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1072 /*
1073 * A PDU/CmdSN carrying Immediate Data passed
1074 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1075 * Immediate Bit is not set.
1076 */
1077 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1078 /*
1079 * Special case for Unsupported SAM WRITE Opcodes
1080 * and ImmediateData=Yes.
1081 */
1082 if (dump_immediate_data) {
1083 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1084 return -1;
1085 } else if (cmd->unsolicited_data) {
1086 iscsit_set_dataout_sequence_values(cmd);
1087
1088 spin_lock_bh(&cmd->dataout_timeout_lock);
1089 iscsit_start_dataout_timer(cmd, cmd->conn);
1090 spin_unlock_bh(&cmd->dataout_timeout_lock);
1091 }
1092
1093 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1094 return iscsit_add_reject_from_cmd(
1095 ISCSI_REASON_PROTOCOL_ERROR,
1096 1, 0, buf, cmd);
1097
1098 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1099 /*
1100 * Immediate Data failed DataCRC and ERL>=1,
1101 * silently drop this PDU and let the initiator
1102 * plug the CmdSN gap.
1103 *
1104 * FIXME: Send Unsolicited NOPIN with reserved
1105 * TTT here to help the initiator figure out
1106 * the missing CmdSN, although they should be
1107 * intelligent enough to determine the missing
1108 * CmdSN and issue a retry to plug the sequence.
1109 */
1110 cmd->i_state = ISTATE_REMOVE;
1111 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1112 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1113 return -1;
1114
1115 return 0;
1116 }
1117
1118 static u32 iscsit_do_crypto_hash_sg(
1119 struct hash_desc *hash,
1120 struct iscsi_cmd *cmd,
1121 u32 data_offset,
1122 u32 data_length,
1123 u32 padding,
1124 u8 *pad_bytes)
1125 {
1126 u32 data_crc;
1127 u32 i;
1128 struct scatterlist *sg;
1129 unsigned int page_off;
1130
1131 crypto_hash_init(hash);
1132
1133 sg = cmd->first_data_sg;
1134 page_off = cmd->first_data_sg_off;
1135
1136 i = 0;
1137 while (data_length) {
1138 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1139
1140 crypto_hash_update(hash, &sg[i], cur_len);
1141
1142 data_length -= cur_len;
1143 page_off = 0;
1144 i++;
1145 }
1146
1147 if (padding) {
1148 struct scatterlist pad_sg;
1149
1150 sg_init_one(&pad_sg, pad_bytes, padding);
1151 crypto_hash_update(hash, &pad_sg, padding);
1152 }
1153 crypto_hash_final(hash, (u8 *) &data_crc);
1154
1155 return data_crc;
1156 }
1157
1158 static void iscsit_do_crypto_hash_buf(
1159 struct hash_desc *hash,
1160 unsigned char *buf,
1161 u32 payload_length,
1162 u32 padding,
1163 u8 *pad_bytes,
1164 u8 *data_crc)
1165 {
1166 struct scatterlist sg;
1167
1168 crypto_hash_init(hash);
1169
1170 sg_init_one(&sg, buf, payload_length);
1171 crypto_hash_update(hash, &sg, payload_length);
1172
1173 if (padding) {
1174 sg_init_one(&sg, pad_bytes, padding);
1175 crypto_hash_update(hash, &sg, padding);
1176 }
1177 crypto_hash_final(hash, data_crc);
1178 }
1179
1180 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1181 {
1182 int iov_ret, ooo_cmdsn = 0, ret;
1183 u8 data_crc_failed = 0;
1184 u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1185 u32 rx_size = 0, payload_length;
1186 struct iscsi_cmd *cmd = NULL;
1187 struct se_cmd *se_cmd;
1188 struct iscsi_data *hdr;
1189 struct kvec *iov;
1190 unsigned long flags;
1191
1192 hdr = (struct iscsi_data *) buf;
1193 payload_length = ntoh24(hdr->dlength);
1194
1195 if (!payload_length) {
1196 pr_err("DataOUT payload is ZERO, protocol error.\n");
1197 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1198 buf, conn);
1199 }
1200
1201 /* iSCSI write */
1202 spin_lock_bh(&conn->sess->session_stats_lock);
1203 conn->sess->rx_data_octets += payload_length;
1204 if (conn->sess->se_sess->se_node_acl) {
1205 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1206 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1207 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1208 }
1209 spin_unlock_bh(&conn->sess->session_stats_lock);
1210
1211 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1212 pr_err("DataSegmentLength: %u is greater than"
1213 " MaxXmitDataSegmentLength: %u\n", payload_length,
1214 conn->conn_ops->MaxXmitDataSegmentLength);
1215 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1216 buf, conn);
1217 }
1218
1219 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1220 payload_length);
1221 if (!cmd)
1222 return 0;
1223
1224 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1225 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1226 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1227 payload_length, conn->cid);
1228
1229 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1230 pr_err("Command ITT: 0x%08x received DataOUT after"
1231 " last DataOUT received, dumping payload\n",
1232 cmd->init_task_tag);
1233 return iscsit_dump_data_payload(conn, payload_length, 1);
1234 }
1235
1236 if (cmd->data_direction != DMA_TO_DEVICE) {
1237 pr_err("Command ITT: 0x%08x received DataOUT for a"
1238 " NON-WRITE command.\n", cmd->init_task_tag);
1239 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1240 1, 0, buf, cmd);
1241 }
1242 se_cmd = &cmd->se_cmd;
1243 iscsit_mod_dataout_timer(cmd);
1244
1245 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1246 pr_err("DataOut Offset: %u, Length %u greater than"
1247 " iSCSI Command EDTL %u, protocol error.\n",
1248 hdr->offset, payload_length, cmd->se_cmd.data_length);
1249 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1250 1, 0, buf, cmd);
1251 }
1252
1253 if (cmd->unsolicited_data) {
1254 int dump_unsolicited_data = 0;
1255
1256 if (conn->sess->sess_ops->InitialR2T) {
1257 pr_err("Received unexpected unsolicited data"
1258 " while InitialR2T=Yes, protocol error.\n");
1259 transport_send_check_condition_and_sense(&cmd->se_cmd,
1260 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1261 return -1;
1262 }
1263 /*
1264 * Special case for dealing with Unsolicited DataOUT
1265 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1266 * failures;
1267 */
1268
1269 /* Something's amiss if we're not in WRITE_PENDING state... */
1270 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1271 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1272 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1273
1274 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1275 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1276 (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION))
1277 dump_unsolicited_data = 1;
1278 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1279
1280 if (dump_unsolicited_data) {
1281 /*
1282 * Check if a delayed TASK_ABORTED status needs to
1283 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1284 * received with the unsolicitied data out.
1285 */
1286 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1287 iscsit_stop_dataout_timer(cmd);
1288
1289 transport_check_aborted_status(se_cmd,
1290 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1291 return iscsit_dump_data_payload(conn, payload_length, 1);
1292 }
1293 } else {
1294 /*
1295 * For the normal solicited data path:
1296 *
1297 * Check for a delayed TASK_ABORTED status and dump any
1298 * incoming data out payload if one exists. Also, when the
1299 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1300 * data out sequence, we decrement outstanding_r2ts. Once
1301 * outstanding_r2ts reaches zero, go ahead and send the delayed
1302 * TASK_ABORTED status.
1303 */
1304 if (se_cmd->transport_state & CMD_T_ABORTED) {
1305 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1306 if (--cmd->outstanding_r2ts < 1) {
1307 iscsit_stop_dataout_timer(cmd);
1308 transport_check_aborted_status(
1309 se_cmd, 1);
1310 }
1311
1312 return iscsit_dump_data_payload(conn, payload_length, 1);
1313 }
1314 }
1315 /*
1316 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1317 * within-command recovery checks before receiving the payload.
1318 */
1319 ret = iscsit_check_pre_dataout(cmd, buf);
1320 if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1321 return 0;
1322 else if (ret == DATAOUT_CANNOT_RECOVER)
1323 return -1;
1324
1325 rx_size += payload_length;
1326 iov = &cmd->iov_data[0];
1327
1328 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1329 payload_length);
1330 if (iov_ret < 0)
1331 return -1;
1332
1333 iov_count += iov_ret;
1334
1335 padding = ((-payload_length) & 3);
1336 if (padding != 0) {
1337 iov[iov_count].iov_base = cmd->pad_bytes;
1338 iov[iov_count++].iov_len = padding;
1339 rx_size += padding;
1340 pr_debug("Receiving %u padding bytes.\n", padding);
1341 }
1342
1343 if (conn->conn_ops->DataDigest) {
1344 iov[iov_count].iov_base = &checksum;
1345 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1346 rx_size += ISCSI_CRC_LEN;
1347 }
1348
1349 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1350
1351 iscsit_unmap_iovec(cmd);
1352
1353 if (rx_got != rx_size)
1354 return -1;
1355
1356 if (conn->conn_ops->DataDigest) {
1357 u32 data_crc;
1358
1359 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1360 be32_to_cpu(hdr->offset),
1361 payload_length, padding,
1362 cmd->pad_bytes);
1363
1364 if (checksum != data_crc) {
1365 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1366 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1367 " does not match computed 0x%08x\n",
1368 hdr->itt, hdr->offset, payload_length,
1369 hdr->datasn, checksum, data_crc);
1370 data_crc_failed = 1;
1371 } else {
1372 pr_debug("Got CRC32C DataDigest 0x%08x for"
1373 " %u bytes of Data Out\n", checksum,
1374 payload_length);
1375 }
1376 }
1377 /*
1378 * Increment post receive data and CRC values or perform
1379 * within-command recovery.
1380 */
1381 ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1382 if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1383 return 0;
1384 else if (ret == DATAOUT_SEND_R2T) {
1385 iscsit_set_dataout_sequence_values(cmd);
1386 iscsit_build_r2ts_for_cmd(cmd, conn, false);
1387 } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1388 /*
1389 * Handle extra special case for out of order
1390 * Unsolicited Data Out.
1391 */
1392 spin_lock_bh(&cmd->istate_lock);
1393 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1394 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1395 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1396 spin_unlock_bh(&cmd->istate_lock);
1397
1398 iscsit_stop_dataout_timer(cmd);
1399 if (ooo_cmdsn)
1400 return 0;
1401 target_execute_cmd(&cmd->se_cmd);
1402 return 0;
1403 } else /* DATAOUT_CANNOT_RECOVER */
1404 return -1;
1405
1406 return 0;
1407 }
1408
1409 static int iscsit_handle_nop_out(
1410 struct iscsi_conn *conn,
1411 unsigned char *buf)
1412 {
1413 unsigned char *ping_data = NULL;
1414 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1415 u32 checksum, data_crc, padding = 0, payload_length;
1416 struct iscsi_cmd *cmd = NULL;
1417 struct kvec *iov = NULL;
1418 struct iscsi_nopout *hdr;
1419
1420 hdr = (struct iscsi_nopout *) buf;
1421 payload_length = ntoh24(hdr->dlength);
1422
1423 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1424 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1425 " not set, protocol error.\n");
1426 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1427 buf, conn);
1428 }
1429
1430 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1431 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1432 " greater than MaxXmitDataSegmentLength: %u, protocol"
1433 " error.\n", payload_length,
1434 conn->conn_ops->MaxXmitDataSegmentLength);
1435 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1436 buf, conn);
1437 }
1438
1439 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1440 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1441 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1442 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1443 payload_length);
1444 /*
1445 * This is not a response to a Unsolicited NopIN, which means
1446 * it can either be a NOPOUT ping request (with a valid ITT),
1447 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1448 * Either way, make sure we allocate an struct iscsi_cmd, as both
1449 * can contain ping data.
1450 */
1451 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1452 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1453 if (!cmd)
1454 return iscsit_add_reject(
1455 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1456 1, buf, conn);
1457
1458 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1459 cmd->i_state = ISTATE_SEND_NOPIN;
1460 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1461 1 : 0);
1462 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1463 cmd->targ_xfer_tag = 0xFFFFFFFF;
1464 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1465 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1466 cmd->data_direction = DMA_NONE;
1467 }
1468
1469 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1470 rx_size = payload_length;
1471 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1472 if (!ping_data) {
1473 pr_err("Unable to allocate memory for"
1474 " NOPOUT ping data.\n");
1475 ret = -1;
1476 goto out;
1477 }
1478
1479 iov = &cmd->iov_misc[0];
1480 iov[niov].iov_base = ping_data;
1481 iov[niov++].iov_len = payload_length;
1482
1483 padding = ((-payload_length) & 3);
1484 if (padding != 0) {
1485 pr_debug("Receiving %u additional bytes"
1486 " for padding.\n", padding);
1487 iov[niov].iov_base = &cmd->pad_bytes;
1488 iov[niov++].iov_len = padding;
1489 rx_size += padding;
1490 }
1491 if (conn->conn_ops->DataDigest) {
1492 iov[niov].iov_base = &checksum;
1493 iov[niov++].iov_len = ISCSI_CRC_LEN;
1494 rx_size += ISCSI_CRC_LEN;
1495 }
1496
1497 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1498 if (rx_got != rx_size) {
1499 ret = -1;
1500 goto out;
1501 }
1502
1503 if (conn->conn_ops->DataDigest) {
1504 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1505 ping_data, payload_length,
1506 padding, cmd->pad_bytes,
1507 (u8 *)&data_crc);
1508
1509 if (checksum != data_crc) {
1510 pr_err("Ping data CRC32C DataDigest"
1511 " 0x%08x does not match computed 0x%08x\n",
1512 checksum, data_crc);
1513 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1514 pr_err("Unable to recover from"
1515 " NOPOUT Ping DataCRC failure while in"
1516 " ERL=0.\n");
1517 ret = -1;
1518 goto out;
1519 } else {
1520 /*
1521 * Silently drop this PDU and let the
1522 * initiator plug the CmdSN gap.
1523 */
1524 pr_debug("Dropping NOPOUT"
1525 " Command CmdSN: 0x%08x due to"
1526 " DataCRC error.\n", hdr->cmdsn);
1527 ret = 0;
1528 goto out;
1529 }
1530 } else {
1531 pr_debug("Got CRC32C DataDigest"
1532 " 0x%08x for %u bytes of ping data.\n",
1533 checksum, payload_length);
1534 }
1535 }
1536
1537 ping_data[payload_length] = '\0';
1538 /*
1539 * Attach ping data to struct iscsi_cmd->buf_ptr.
1540 */
1541 cmd->buf_ptr = ping_data;
1542 cmd->buf_ptr_size = payload_length;
1543
1544 pr_debug("Got %u bytes of NOPOUT ping"
1545 " data.\n", payload_length);
1546 pr_debug("Ping Data: \"%s\"\n", ping_data);
1547 }
1548
1549 if (hdr->itt != RESERVED_ITT) {
1550 if (!cmd) {
1551 pr_err("Checking CmdSN for NOPOUT,"
1552 " but cmd is NULL!\n");
1553 return -1;
1554 }
1555 /*
1556 * Initiator is expecting a NopIN ping reply,
1557 */
1558 spin_lock_bh(&conn->cmd_lock);
1559 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1560 spin_unlock_bh(&conn->cmd_lock);
1561
1562 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1563
1564 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1565 iscsit_add_cmd_to_response_queue(cmd, conn,
1566 cmd->i_state);
1567 return 0;
1568 }
1569
1570 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1571 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1572 ret = 0;
1573 goto ping_out;
1574 }
1575 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1576 return iscsit_add_reject_from_cmd(
1577 ISCSI_REASON_PROTOCOL_ERROR,
1578 1, 0, buf, cmd);
1579
1580 return 0;
1581 }
1582
1583 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1584 /*
1585 * This was a response to a unsolicited NOPIN ping.
1586 */
1587 cmd = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1588 if (!cmd)
1589 return -1;
1590
1591 iscsit_stop_nopin_response_timer(conn);
1592
1593 cmd->i_state = ISTATE_REMOVE;
1594 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1595 iscsit_start_nopin_timer(conn);
1596 } else {
1597 /*
1598 * Initiator is not expecting a NOPIN is response.
1599 * Just ignore for now.
1600 *
1601 * iSCSI v19-91 10.18
1602 * "A NOP-OUT may also be used to confirm a changed
1603 * ExpStatSN if another PDU will not be available
1604 * for a long time."
1605 */
1606 ret = 0;
1607 goto out;
1608 }
1609
1610 return 0;
1611 out:
1612 if (cmd)
1613 iscsit_release_cmd(cmd);
1614 ping_out:
1615 kfree(ping_data);
1616 return ret;
1617 }
1618
1619 static int iscsit_handle_task_mgt_cmd(
1620 struct iscsi_conn *conn,
1621 unsigned char *buf)
1622 {
1623 struct iscsi_cmd *cmd;
1624 struct se_tmr_req *se_tmr;
1625 struct iscsi_tmr_req *tmr_req;
1626 struct iscsi_tm *hdr;
1627 int out_of_order_cmdsn = 0;
1628 int ret;
1629 u8 function;
1630
1631 hdr = (struct iscsi_tm *) buf;
1632 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1633 function = hdr->flags;
1634
1635 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1636 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1637 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1638 hdr->rtt, hdr->refcmdsn, conn->cid);
1639
1640 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1641 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1642 hdr->rtt != RESERVED_ITT)) {
1643 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1644 hdr->rtt = RESERVED_ITT;
1645 }
1646
1647 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1648 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1649 pr_err("Task Management Request TASK_REASSIGN not"
1650 " issued as immediate command, bad iSCSI Initiator"
1651 "implementation\n");
1652 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1653 buf, conn);
1654 }
1655 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1656 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1657 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1658
1659 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1660 if (!cmd)
1661 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1662 1, buf, conn);
1663
1664 cmd->data_direction = DMA_NONE;
1665
1666 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1667 if (!cmd->tmr_req) {
1668 pr_err("Unable to allocate memory for"
1669 " Task Management command!\n");
1670 return iscsit_add_reject_from_cmd(
1671 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1672 1, 1, buf, cmd);
1673 }
1674
1675 /*
1676 * TASK_REASSIGN for ERL=2 / connection stays inside of
1677 * LIO-Target $FABRIC_MOD
1678 */
1679 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1680
1681 u8 tcm_function;
1682 int ret;
1683
1684 transport_init_se_cmd(&cmd->se_cmd,
1685 &lio_target_fabric_configfs->tf_ops,
1686 conn->sess->se_sess, 0, DMA_NONE,
1687 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1688
1689 switch (function) {
1690 case ISCSI_TM_FUNC_ABORT_TASK:
1691 tcm_function = TMR_ABORT_TASK;
1692 break;
1693 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1694 tcm_function = TMR_ABORT_TASK_SET;
1695 break;
1696 case ISCSI_TM_FUNC_CLEAR_ACA:
1697 tcm_function = TMR_CLEAR_ACA;
1698 break;
1699 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1700 tcm_function = TMR_CLEAR_TASK_SET;
1701 break;
1702 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1703 tcm_function = TMR_LUN_RESET;
1704 break;
1705 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1706 tcm_function = TMR_TARGET_WARM_RESET;
1707 break;
1708 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1709 tcm_function = TMR_TARGET_COLD_RESET;
1710 break;
1711 default:
1712 pr_err("Unknown iSCSI TMR Function:"
1713 " 0x%02x\n", function);
1714 return iscsit_add_reject_from_cmd(
1715 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1716 1, 1, buf, cmd);
1717 }
1718
1719 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1720 tcm_function, GFP_KERNEL);
1721 if (ret < 0)
1722 return iscsit_add_reject_from_cmd(
1723 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1724 1, 1, buf, cmd);
1725
1726 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1727 }
1728
1729 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1730 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1731 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1732 cmd->init_task_tag = hdr->itt;
1733 cmd->targ_xfer_tag = 0xFFFFFFFF;
1734 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1735 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1736 se_tmr = cmd->se_cmd.se_tmr_req;
1737 tmr_req = cmd->tmr_req;
1738 /*
1739 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1740 */
1741 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1742 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1743 scsilun_to_int(&hdr->lun));
1744 if (ret < 0) {
1745 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1746 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1747 goto attach;
1748 }
1749 }
1750
1751 switch (function) {
1752 case ISCSI_TM_FUNC_ABORT_TASK:
1753 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1754 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1755 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1756 goto attach;
1757 }
1758 break;
1759 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1760 case ISCSI_TM_FUNC_CLEAR_ACA:
1761 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1762 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1763 break;
1764 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1765 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1766 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1767 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1768 goto attach;
1769 }
1770 break;
1771 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1772 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1773 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1774 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1775 goto attach;
1776 }
1777 break;
1778 case ISCSI_TM_FUNC_TASK_REASSIGN:
1779 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1780 /*
1781 * Perform sanity checks on the ExpDataSN only if the
1782 * TASK_REASSIGN was successful.
1783 */
1784 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1785 break;
1786
1787 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1788 return iscsit_add_reject_from_cmd(
1789 ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1790 buf, cmd);
1791 break;
1792 default:
1793 pr_err("Unknown TMR function: 0x%02x, protocol"
1794 " error.\n", function);
1795 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1796 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1797 goto attach;
1798 }
1799
1800 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1801 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1802 se_tmr->call_transport = 1;
1803 attach:
1804 spin_lock_bh(&conn->cmd_lock);
1805 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1806 spin_unlock_bh(&conn->cmd_lock);
1807
1808 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1809 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1810 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1811 out_of_order_cmdsn = 1;
1812 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1813 return 0;
1814 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1815 return iscsit_add_reject_from_cmd(
1816 ISCSI_REASON_PROTOCOL_ERROR,
1817 1, 0, buf, cmd);
1818 }
1819 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1820
1821 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1822 return 0;
1823 /*
1824 * Found the referenced task, send to transport for processing.
1825 */
1826 if (se_tmr->call_transport)
1827 return transport_generic_handle_tmr(&cmd->se_cmd);
1828
1829 /*
1830 * Could not find the referenced LUN, task, or Task Management
1831 * command not authorized or supported. Change state and
1832 * let the tx_thread send the response.
1833 *
1834 * For connection recovery, this is also the default action for
1835 * TMR TASK_REASSIGN.
1836 */
1837 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1838 return 0;
1839 }
1840
1841 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1842 static int iscsit_handle_text_cmd(
1843 struct iscsi_conn *conn,
1844 unsigned char *buf)
1845 {
1846 char *text_ptr, *text_in;
1847 int cmdsn_ret, niov = 0, rx_got, rx_size;
1848 u32 checksum = 0, data_crc = 0, payload_length;
1849 u32 padding = 0, pad_bytes = 0, text_length = 0;
1850 struct iscsi_cmd *cmd;
1851 struct kvec iov[3];
1852 struct iscsi_text *hdr;
1853
1854 hdr = (struct iscsi_text *) buf;
1855 payload_length = ntoh24(hdr->dlength);
1856
1857 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1858 pr_err("Unable to accept text parameter length: %u"
1859 "greater than MaxXmitDataSegmentLength %u.\n",
1860 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1861 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1862 buf, conn);
1863 }
1864
1865 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1866 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1867 hdr->exp_statsn, payload_length);
1868
1869 rx_size = text_length = payload_length;
1870 if (text_length) {
1871 text_in = kzalloc(text_length, GFP_KERNEL);
1872 if (!text_in) {
1873 pr_err("Unable to allocate memory for"
1874 " incoming text parameters\n");
1875 return -1;
1876 }
1877
1878 memset(iov, 0, 3 * sizeof(struct kvec));
1879 iov[niov].iov_base = text_in;
1880 iov[niov++].iov_len = text_length;
1881
1882 padding = ((-payload_length) & 3);
1883 if (padding != 0) {
1884 iov[niov].iov_base = &pad_bytes;
1885 iov[niov++].iov_len = padding;
1886 rx_size += padding;
1887 pr_debug("Receiving %u additional bytes"
1888 " for padding.\n", padding);
1889 }
1890 if (conn->conn_ops->DataDigest) {
1891 iov[niov].iov_base = &checksum;
1892 iov[niov++].iov_len = ISCSI_CRC_LEN;
1893 rx_size += ISCSI_CRC_LEN;
1894 }
1895
1896 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1897 if (rx_got != rx_size) {
1898 kfree(text_in);
1899 return -1;
1900 }
1901
1902 if (conn->conn_ops->DataDigest) {
1903 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1904 text_in, text_length,
1905 padding, (u8 *)&pad_bytes,
1906 (u8 *)&data_crc);
1907
1908 if (checksum != data_crc) {
1909 pr_err("Text data CRC32C DataDigest"
1910 " 0x%08x does not match computed"
1911 " 0x%08x\n", checksum, data_crc);
1912 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1913 pr_err("Unable to recover from"
1914 " Text Data digest failure while in"
1915 " ERL=0.\n");
1916 kfree(text_in);
1917 return -1;
1918 } else {
1919 /*
1920 * Silently drop this PDU and let the
1921 * initiator plug the CmdSN gap.
1922 */
1923 pr_debug("Dropping Text"
1924 " Command CmdSN: 0x%08x due to"
1925 " DataCRC error.\n", hdr->cmdsn);
1926 kfree(text_in);
1927 return 0;
1928 }
1929 } else {
1930 pr_debug("Got CRC32C DataDigest"
1931 " 0x%08x for %u bytes of text data.\n",
1932 checksum, text_length);
1933 }
1934 }
1935 text_in[text_length - 1] = '\0';
1936 pr_debug("Successfully read %d bytes of text"
1937 " data.\n", text_length);
1938
1939 if (strncmp("SendTargets", text_in, 11) != 0) {
1940 pr_err("Received Text Data that is not"
1941 " SendTargets, cannot continue.\n");
1942 kfree(text_in);
1943 return -1;
1944 }
1945 text_ptr = strchr(text_in, '=');
1946 if (!text_ptr) {
1947 pr_err("No \"=\" separator found in Text Data,"
1948 " cannot continue.\n");
1949 kfree(text_in);
1950 return -1;
1951 }
1952 if (strncmp("=All", text_ptr, 4) != 0) {
1953 pr_err("Unable to locate All value for"
1954 " SendTargets key, cannot continue.\n");
1955 kfree(text_in);
1956 return -1;
1957 }
1958 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1959 kfree(text_in);
1960 }
1961
1962 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1963 if (!cmd)
1964 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1965 1, buf, conn);
1966
1967 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1968 cmd->i_state = ISTATE_SEND_TEXTRSP;
1969 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1970 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1971 cmd->targ_xfer_tag = 0xFFFFFFFF;
1972 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1973 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1974 cmd->data_direction = DMA_NONE;
1975
1976 spin_lock_bh(&conn->cmd_lock);
1977 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1978 spin_unlock_bh(&conn->cmd_lock);
1979
1980 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1981
1982 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1983 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1984 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1985 return iscsit_add_reject_from_cmd(
1986 ISCSI_REASON_PROTOCOL_ERROR,
1987 1, 0, buf, cmd);
1988
1989 return 0;
1990 }
1991
1992 return iscsit_execute_cmd(cmd, 0);
1993 }
1994
1995 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1996 {
1997 struct iscsi_conn *conn_p;
1998 struct iscsi_session *sess = conn->sess;
1999
2000 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2001 " for SID: %u.\n", conn->cid, conn->sess->sid);
2002
2003 atomic_set(&sess->session_logout, 1);
2004 atomic_set(&conn->conn_logout_remove, 1);
2005 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2006
2007 iscsit_inc_conn_usage_count(conn);
2008 iscsit_inc_session_usage_count(sess);
2009
2010 spin_lock_bh(&sess->conn_lock);
2011 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2012 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2013 continue;
2014
2015 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2016 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2017 }
2018 spin_unlock_bh(&sess->conn_lock);
2019
2020 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2021
2022 return 0;
2023 }
2024
2025 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2026 {
2027 struct iscsi_conn *l_conn;
2028 struct iscsi_session *sess = conn->sess;
2029
2030 pr_debug("Received logout request CLOSECONNECTION for CID:"
2031 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2032
2033 /*
2034 * A Logout Request with a CLOSECONNECTION reason code for a CID
2035 * can arrive on a connection with a differing CID.
2036 */
2037 if (conn->cid == cmd->logout_cid) {
2038 spin_lock_bh(&conn->state_lock);
2039 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2040 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2041
2042 atomic_set(&conn->conn_logout_remove, 1);
2043 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2044 iscsit_inc_conn_usage_count(conn);
2045
2046 spin_unlock_bh(&conn->state_lock);
2047 } else {
2048 /*
2049 * Handle all different cid CLOSECONNECTION requests in
2050 * iscsit_logout_post_handler_diffcid() as to give enough
2051 * time for any non immediate command's CmdSN to be
2052 * acknowledged on the connection in question.
2053 *
2054 * Here we simply make sure the CID is still around.
2055 */
2056 l_conn = iscsit_get_conn_from_cid(sess,
2057 cmd->logout_cid);
2058 if (!l_conn) {
2059 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2060 iscsit_add_cmd_to_response_queue(cmd, conn,
2061 cmd->i_state);
2062 return 0;
2063 }
2064
2065 iscsit_dec_conn_usage_count(l_conn);
2066 }
2067
2068 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2069
2070 return 0;
2071 }
2072
2073 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2074 {
2075 struct iscsi_session *sess = conn->sess;
2076
2077 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2078 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2079
2080 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2081 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2082 " while ERL!=2.\n");
2083 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2084 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2085 return 0;
2086 }
2087
2088 if (conn->cid == cmd->logout_cid) {
2089 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2090 " with CID: %hu on CID: %hu, implementation error.\n",
2091 cmd->logout_cid, conn->cid);
2092 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2093 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2094 return 0;
2095 }
2096
2097 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2098
2099 return 0;
2100 }
2101
2102 static int iscsit_handle_logout_cmd(
2103 struct iscsi_conn *conn,
2104 unsigned char *buf)
2105 {
2106 int cmdsn_ret, logout_remove = 0;
2107 u8 reason_code = 0;
2108 struct iscsi_cmd *cmd;
2109 struct iscsi_logout *hdr;
2110 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2111
2112 hdr = (struct iscsi_logout *) buf;
2113 reason_code = (hdr->flags & 0x7f);
2114
2115 if (tiqn) {
2116 spin_lock(&tiqn->logout_stats.lock);
2117 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2118 tiqn->logout_stats.normal_logouts++;
2119 else
2120 tiqn->logout_stats.abnormal_logouts++;
2121 spin_unlock(&tiqn->logout_stats.lock);
2122 }
2123
2124 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2125 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2126 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2127 hdr->cid, conn->cid);
2128
2129 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2130 pr_err("Received logout request on connection that"
2131 " is not in logged in state, ignoring request.\n");
2132 return 0;
2133 }
2134
2135 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2136 if (!cmd)
2137 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2138 buf, conn);
2139
2140 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2141 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2142 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2143 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2144 cmd->targ_xfer_tag = 0xFFFFFFFF;
2145 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2146 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2147 cmd->logout_cid = be16_to_cpu(hdr->cid);
2148 cmd->logout_reason = reason_code;
2149 cmd->data_direction = DMA_NONE;
2150
2151 /*
2152 * We need to sleep in these cases (by returning 1) until the Logout
2153 * Response gets sent in the tx thread.
2154 */
2155 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2156 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2157 be16_to_cpu(hdr->cid) == conn->cid))
2158 logout_remove = 1;
2159
2160 spin_lock_bh(&conn->cmd_lock);
2161 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2162 spin_unlock_bh(&conn->cmd_lock);
2163
2164 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2165 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2166
2167 /*
2168 * Immediate commands are executed, well, immediately.
2169 * Non-Immediate Logout Commands are executed in CmdSN order.
2170 */
2171 if (cmd->immediate_cmd) {
2172 int ret = iscsit_execute_cmd(cmd, 0);
2173
2174 if (ret < 0)
2175 return ret;
2176 } else {
2177 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2178 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2179 logout_remove = 0;
2180 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2181 return iscsit_add_reject_from_cmd(
2182 ISCSI_REASON_PROTOCOL_ERROR,
2183 1, 0, buf, cmd);
2184 }
2185 }
2186
2187 return logout_remove;
2188 }
2189
2190 static int iscsit_handle_snack(
2191 struct iscsi_conn *conn,
2192 unsigned char *buf)
2193 {
2194 struct iscsi_snack *hdr;
2195
2196 hdr = (struct iscsi_snack *) buf;
2197 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2198
2199 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2200 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2201 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2202 hdr->begrun, hdr->runlength, conn->cid);
2203
2204 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2205 pr_err("Initiator sent SNACK request while in"
2206 " ErrorRecoveryLevel=0.\n");
2207 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2208 buf, conn);
2209 }
2210 /*
2211 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2212 * call from inside iscsi_send_recovery_datain_or_r2t().
2213 */
2214 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2215 case 0:
2216 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2217 hdr->itt,
2218 be32_to_cpu(hdr->ttt),
2219 be32_to_cpu(hdr->begrun),
2220 be32_to_cpu(hdr->runlength));
2221 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2222 return iscsit_handle_status_snack(conn, hdr->itt,
2223 be32_to_cpu(hdr->ttt),
2224 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2225 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2226 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2227 be32_to_cpu(hdr->begrun),
2228 be32_to_cpu(hdr->runlength));
2229 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2230 /* FIXME: Support R-Data SNACK */
2231 pr_err("R-Data SNACK Not Supported.\n");
2232 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2233 buf, conn);
2234 default:
2235 pr_err("Unknown SNACK type 0x%02x, protocol"
2236 " error.\n", hdr->flags & 0x0f);
2237 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2238 buf, conn);
2239 }
2240
2241 return 0;
2242 }
2243
2244 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2245 {
2246 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2247 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2248 wait_for_completion_interruptible_timeout(
2249 &conn->rx_half_close_comp,
2250 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2251 }
2252 }
2253
2254 static int iscsit_handle_immediate_data(
2255 struct iscsi_cmd *cmd,
2256 unsigned char *buf,
2257 u32 length)
2258 {
2259 int iov_ret, rx_got = 0, rx_size = 0;
2260 u32 checksum, iov_count = 0, padding = 0;
2261 struct iscsi_conn *conn = cmd->conn;
2262 struct kvec *iov;
2263
2264 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2265 if (iov_ret < 0)
2266 return IMMEDIATE_DATA_CANNOT_RECOVER;
2267
2268 rx_size = length;
2269 iov_count = iov_ret;
2270 iov = &cmd->iov_data[0];
2271
2272 padding = ((-length) & 3);
2273 if (padding != 0) {
2274 iov[iov_count].iov_base = cmd->pad_bytes;
2275 iov[iov_count++].iov_len = padding;
2276 rx_size += padding;
2277 }
2278
2279 if (conn->conn_ops->DataDigest) {
2280 iov[iov_count].iov_base = &checksum;
2281 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2282 rx_size += ISCSI_CRC_LEN;
2283 }
2284
2285 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2286
2287 iscsit_unmap_iovec(cmd);
2288
2289 if (rx_got != rx_size) {
2290 iscsit_rx_thread_wait_for_tcp(conn);
2291 return IMMEDIATE_DATA_CANNOT_RECOVER;
2292 }
2293
2294 if (conn->conn_ops->DataDigest) {
2295 u32 data_crc;
2296
2297 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2298 cmd->write_data_done, length, padding,
2299 cmd->pad_bytes);
2300
2301 if (checksum != data_crc) {
2302 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2303 " does not match computed 0x%08x\n", checksum,
2304 data_crc);
2305
2306 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2307 pr_err("Unable to recover from"
2308 " Immediate Data digest failure while"
2309 " in ERL=0.\n");
2310 iscsit_add_reject_from_cmd(
2311 ISCSI_REASON_DATA_DIGEST_ERROR,
2312 1, 0, buf, cmd);
2313 return IMMEDIATE_DATA_CANNOT_RECOVER;
2314 } else {
2315 iscsit_add_reject_from_cmd(
2316 ISCSI_REASON_DATA_DIGEST_ERROR,
2317 0, 0, buf, cmd);
2318 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2319 }
2320 } else {
2321 pr_debug("Got CRC32C DataDigest 0x%08x for"
2322 " %u bytes of Immediate Data\n", checksum,
2323 length);
2324 }
2325 }
2326
2327 cmd->write_data_done += length;
2328
2329 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2330 spin_lock_bh(&cmd->istate_lock);
2331 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2332 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2333 spin_unlock_bh(&cmd->istate_lock);
2334 }
2335
2336 return IMMEDIATE_DATA_NORMAL_OPERATION;
2337 }
2338
2339 /*
2340 * Called with sess->conn_lock held.
2341 */
2342 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2343 with active network interface */
2344 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2345 {
2346 struct iscsi_cmd *cmd;
2347 struct iscsi_conn *conn_p;
2348
2349 /*
2350 * Only send a Asynchronous Message on connections whos network
2351 * interface is still functional.
2352 */
2353 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2354 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2355 iscsit_inc_conn_usage_count(conn_p);
2356 break;
2357 }
2358 }
2359
2360 if (!conn_p)
2361 return;
2362
2363 cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
2364 if (!cmd) {
2365 iscsit_dec_conn_usage_count(conn_p);
2366 return;
2367 }
2368
2369 cmd->logout_cid = conn->cid;
2370 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2371 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2372
2373 spin_lock_bh(&conn_p->cmd_lock);
2374 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2375 spin_unlock_bh(&conn_p->cmd_lock);
2376
2377 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2378 iscsit_dec_conn_usage_count(conn_p);
2379 }
2380
2381 static int iscsit_send_conn_drop_async_message(
2382 struct iscsi_cmd *cmd,
2383 struct iscsi_conn *conn)
2384 {
2385 struct iscsi_async *hdr;
2386
2387 cmd->tx_size = ISCSI_HDR_LEN;
2388 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2389
2390 hdr = (struct iscsi_async *) cmd->pdu;
2391 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2392 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2393 cmd->init_task_tag = RESERVED_ITT;
2394 cmd->targ_xfer_tag = 0xFFFFFFFF;
2395 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2396 cmd->stat_sn = conn->stat_sn++;
2397 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2398 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2399 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2400 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2401 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2402 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2403 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2404
2405 if (conn->conn_ops->HeaderDigest) {
2406 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2407
2408 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2409 (unsigned char *)hdr, ISCSI_HDR_LEN,
2410 0, NULL, (u8 *)header_digest);
2411
2412 cmd->tx_size += ISCSI_CRC_LEN;
2413 pr_debug("Attaching CRC32C HeaderDigest to"
2414 " Async Message 0x%08x\n", *header_digest);
2415 }
2416
2417 cmd->iov_misc[0].iov_base = cmd->pdu;
2418 cmd->iov_misc[0].iov_len = cmd->tx_size;
2419 cmd->iov_misc_count = 1;
2420
2421 pr_debug("Sending Connection Dropped Async Message StatSN:"
2422 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2423 cmd->logout_cid, conn->cid);
2424 return 0;
2425 }
2426
2427 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2428 {
2429 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2430 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2431 wait_for_completion_interruptible_timeout(
2432 &conn->tx_half_close_comp,
2433 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2434 }
2435 }
2436
2437 static int iscsit_send_data_in(
2438 struct iscsi_cmd *cmd,
2439 struct iscsi_conn *conn)
2440 {
2441 int iov_ret = 0, set_statsn = 0;
2442 u32 iov_count = 0, tx_size = 0;
2443 struct iscsi_datain datain;
2444 struct iscsi_datain_req *dr;
2445 struct iscsi_data_rsp *hdr;
2446 struct kvec *iov;
2447 int eodr = 0;
2448 int ret;
2449
2450 memset(&datain, 0, sizeof(struct iscsi_datain));
2451 dr = iscsit_get_datain_values(cmd, &datain);
2452 if (!dr) {
2453 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2454 cmd->init_task_tag);
2455 return -1;
2456 }
2457
2458 /*
2459 * Be paranoid and double check the logic for now.
2460 */
2461 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2462 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2463 " datain.length: %u exceeds cmd->data_length: %u\n",
2464 cmd->init_task_tag, datain.offset, datain.length,
2465 cmd->se_cmd.data_length);
2466 return -1;
2467 }
2468
2469 spin_lock_bh(&conn->sess->session_stats_lock);
2470 conn->sess->tx_data_octets += datain.length;
2471 if (conn->sess->se_sess->se_node_acl) {
2472 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2473 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2474 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2475 }
2476 spin_unlock_bh(&conn->sess->session_stats_lock);
2477 /*
2478 * Special case for successfully execution w/ both DATAIN
2479 * and Sense Data.
2480 */
2481 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2482 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2483 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2484 else {
2485 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2486 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2487 iscsit_increment_maxcmdsn(cmd, conn->sess);
2488 cmd->stat_sn = conn->stat_sn++;
2489 set_statsn = 1;
2490 } else if (dr->dr_complete ==
2491 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2492 set_statsn = 1;
2493 }
2494
2495 hdr = (struct iscsi_data_rsp *) cmd->pdu;
2496 memset(hdr, 0, ISCSI_HDR_LEN);
2497 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2498 hdr->flags = datain.flags;
2499 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2500 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2501 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2502 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2503 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2504 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2505 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2506 }
2507 }
2508 hton24(hdr->dlength, datain.length);
2509 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2510 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2511 (struct scsi_lun *)&hdr->lun);
2512 else
2513 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2514
2515 hdr->itt = cmd->init_task_tag;
2516
2517 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2518 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2519 else
2520 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2521 if (set_statsn)
2522 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2523 else
2524 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2525
2526 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2527 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2528 hdr->datasn = cpu_to_be32(datain.data_sn);
2529 hdr->offset = cpu_to_be32(datain.offset);
2530
2531 iov = &cmd->iov_data[0];
2532 iov[iov_count].iov_base = cmd->pdu;
2533 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2534 tx_size += ISCSI_HDR_LEN;
2535
2536 if (conn->conn_ops->HeaderDigest) {
2537 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2538
2539 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2540 (unsigned char *)hdr, ISCSI_HDR_LEN,
2541 0, NULL, (u8 *)header_digest);
2542
2543 iov[0].iov_len += ISCSI_CRC_LEN;
2544 tx_size += ISCSI_CRC_LEN;
2545
2546 pr_debug("Attaching CRC32 HeaderDigest"
2547 " for DataIN PDU 0x%08x\n", *header_digest);
2548 }
2549
2550 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2551 if (iov_ret < 0)
2552 return -1;
2553
2554 iov_count += iov_ret;
2555 tx_size += datain.length;
2556
2557 cmd->padding = ((-datain.length) & 3);
2558 if (cmd->padding) {
2559 iov[iov_count].iov_base = cmd->pad_bytes;
2560 iov[iov_count++].iov_len = cmd->padding;
2561 tx_size += cmd->padding;
2562
2563 pr_debug("Attaching %u padding bytes\n",
2564 cmd->padding);
2565 }
2566 if (conn->conn_ops->DataDigest) {
2567 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2568 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2569
2570 iov[iov_count].iov_base = &cmd->data_crc;
2571 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2572 tx_size += ISCSI_CRC_LEN;
2573
2574 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2575 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2576 }
2577
2578 cmd->iov_data_count = iov_count;
2579 cmd->tx_size = tx_size;
2580
2581 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2582 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2583 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2584 ntohl(hdr->offset), datain.length, conn->cid);
2585
2586 /* sendpage is preferred but can't insert markers */
2587 if (!conn->conn_ops->IFMarker)
2588 ret = iscsit_fe_sendpage_sg(cmd, conn);
2589 else
2590 ret = iscsit_send_tx_data(cmd, conn, 0);
2591
2592 iscsit_unmap_iovec(cmd);
2593
2594 if (ret < 0) {
2595 iscsit_tx_thread_wait_for_tcp(conn);
2596 return ret;
2597 }
2598
2599 if (dr->dr_complete) {
2600 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2601 2 : 1;
2602 iscsit_free_datain_req(cmd, dr);
2603 }
2604
2605 return eodr;
2606 }
2607
2608 static int iscsit_send_logout_response(
2609 struct iscsi_cmd *cmd,
2610 struct iscsi_conn *conn)
2611 {
2612 int niov = 0, tx_size;
2613 struct iscsi_conn *logout_conn = NULL;
2614 struct iscsi_conn_recovery *cr = NULL;
2615 struct iscsi_session *sess = conn->sess;
2616 struct kvec *iov;
2617 struct iscsi_logout_rsp *hdr;
2618 /*
2619 * The actual shutting down of Sessions and/or Connections
2620 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2621 * is done in scsi_logout_post_handler().
2622 */
2623 switch (cmd->logout_reason) {
2624 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2625 pr_debug("iSCSI session logout successful, setting"
2626 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2627 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2628 break;
2629 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2630 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2631 break;
2632 /*
2633 * For CLOSECONNECTION logout requests carrying
2634 * a matching logout CID -> local CID, the reference
2635 * for the local CID will have been incremented in
2636 * iscsi_logout_closeconnection().
2637 *
2638 * For CLOSECONNECTION logout requests carrying
2639 * a different CID than the connection it arrived
2640 * on, the connection responding to cmd->logout_cid
2641 * is stopped in iscsit_logout_post_handler_diffcid().
2642 */
2643
2644 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2645 " successful.\n", cmd->logout_cid, conn->cid);
2646 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2647 break;
2648 case ISCSI_LOGOUT_REASON_RECOVERY:
2649 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2650 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2651 break;
2652 /*
2653 * If the connection is still active from our point of view
2654 * force connection recovery to occur.
2655 */
2656 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2657 cmd->logout_cid);
2658 if (logout_conn) {
2659 iscsit_connection_reinstatement_rcfr(logout_conn);
2660 iscsit_dec_conn_usage_count(logout_conn);
2661 }
2662
2663 cr = iscsit_get_inactive_connection_recovery_entry(
2664 conn->sess, cmd->logout_cid);
2665 if (!cr) {
2666 pr_err("Unable to locate CID: %hu for"
2667 " REMOVECONNFORRECOVERY Logout Request.\n",
2668 cmd->logout_cid);
2669 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2670 break;
2671 }
2672
2673 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2674
2675 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2676 " for recovery for CID: %hu on CID: %hu successful.\n",
2677 cmd->logout_cid, conn->cid);
2678 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2679 break;
2680 default:
2681 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2682 cmd->logout_reason);
2683 return -1;
2684 }
2685
2686 tx_size = ISCSI_HDR_LEN;
2687 hdr = (struct iscsi_logout_rsp *)cmd->pdu;
2688 memset(hdr, 0, ISCSI_HDR_LEN);
2689 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2690 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2691 hdr->response = cmd->logout_response;
2692 hdr->itt = cmd->init_task_tag;
2693 cmd->stat_sn = conn->stat_sn++;
2694 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2695
2696 iscsit_increment_maxcmdsn(cmd, conn->sess);
2697 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2698 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2699
2700 iov = &cmd->iov_misc[0];
2701 iov[niov].iov_base = cmd->pdu;
2702 iov[niov++].iov_len = ISCSI_HDR_LEN;
2703
2704 if (conn->conn_ops->HeaderDigest) {
2705 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2706
2707 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2708 (unsigned char *)hdr, ISCSI_HDR_LEN,
2709 0, NULL, (u8 *)header_digest);
2710
2711 iov[0].iov_len += ISCSI_CRC_LEN;
2712 tx_size += ISCSI_CRC_LEN;
2713 pr_debug("Attaching CRC32C HeaderDigest to"
2714 " Logout Response 0x%08x\n", *header_digest);
2715 }
2716 cmd->iov_misc_count = niov;
2717 cmd->tx_size = tx_size;
2718
2719 pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2720 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2721 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2722 cmd->logout_cid, conn->cid);
2723
2724 return 0;
2725 }
2726
2727 /*
2728 * Unsolicited NOPIN, either requesting a response or not.
2729 */
2730 static int iscsit_send_unsolicited_nopin(
2731 struct iscsi_cmd *cmd,
2732 struct iscsi_conn *conn,
2733 int want_response)
2734 {
2735 int tx_size = ISCSI_HDR_LEN;
2736 struct iscsi_nopin *hdr;
2737 int ret;
2738
2739 hdr = (struct iscsi_nopin *) cmd->pdu;
2740 memset(hdr, 0, ISCSI_HDR_LEN);
2741 hdr->opcode = ISCSI_OP_NOOP_IN;
2742 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2743 hdr->itt = cmd->init_task_tag;
2744 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2745 cmd->stat_sn = conn->stat_sn;
2746 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2747 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2748 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2749
2750 if (conn->conn_ops->HeaderDigest) {
2751 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2752
2753 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2754 (unsigned char *)hdr, ISCSI_HDR_LEN,
2755 0, NULL, (u8 *)header_digest);
2756
2757 tx_size += ISCSI_CRC_LEN;
2758 pr_debug("Attaching CRC32C HeaderDigest to"
2759 " NopIN 0x%08x\n", *header_digest);
2760 }
2761
2762 cmd->iov_misc[0].iov_base = cmd->pdu;
2763 cmd->iov_misc[0].iov_len = tx_size;
2764 cmd->iov_misc_count = 1;
2765 cmd->tx_size = tx_size;
2766
2767 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2768 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2769
2770 ret = iscsit_send_tx_data(cmd, conn, 1);
2771 if (ret < 0) {
2772 iscsit_tx_thread_wait_for_tcp(conn);
2773 return ret;
2774 }
2775
2776 spin_lock_bh(&cmd->istate_lock);
2777 cmd->i_state = want_response ?
2778 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2779 spin_unlock_bh(&cmd->istate_lock);
2780
2781 return 0;
2782 }
2783
2784 static int iscsit_send_nopin_response(
2785 struct iscsi_cmd *cmd,
2786 struct iscsi_conn *conn)
2787 {
2788 int niov = 0, tx_size;
2789 u32 padding = 0;
2790 struct kvec *iov;
2791 struct iscsi_nopin *hdr;
2792
2793 tx_size = ISCSI_HDR_LEN;
2794 hdr = (struct iscsi_nopin *) cmd->pdu;
2795 memset(hdr, 0, ISCSI_HDR_LEN);
2796 hdr->opcode = ISCSI_OP_NOOP_IN;
2797 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2798 hton24(hdr->dlength, cmd->buf_ptr_size);
2799 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2800 hdr->itt = cmd->init_task_tag;
2801 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2802 cmd->stat_sn = conn->stat_sn++;
2803 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2804
2805 iscsit_increment_maxcmdsn(cmd, conn->sess);
2806 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2807 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2808
2809 iov = &cmd->iov_misc[0];
2810 iov[niov].iov_base = cmd->pdu;
2811 iov[niov++].iov_len = ISCSI_HDR_LEN;
2812
2813 if (conn->conn_ops->HeaderDigest) {
2814 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2815
2816 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2817 (unsigned char *)hdr, ISCSI_HDR_LEN,
2818 0, NULL, (u8 *)header_digest);
2819
2820 iov[0].iov_len += ISCSI_CRC_LEN;
2821 tx_size += ISCSI_CRC_LEN;
2822 pr_debug("Attaching CRC32C HeaderDigest"
2823 " to NopIn 0x%08x\n", *header_digest);
2824 }
2825
2826 /*
2827 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2828 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2829 */
2830 if (cmd->buf_ptr_size) {
2831 iov[niov].iov_base = cmd->buf_ptr;
2832 iov[niov++].iov_len = cmd->buf_ptr_size;
2833 tx_size += cmd->buf_ptr_size;
2834
2835 pr_debug("Echoing back %u bytes of ping"
2836 " data.\n", cmd->buf_ptr_size);
2837
2838 padding = ((-cmd->buf_ptr_size) & 3);
2839 if (padding != 0) {
2840 iov[niov].iov_base = &cmd->pad_bytes;
2841 iov[niov++].iov_len = padding;
2842 tx_size += padding;
2843 pr_debug("Attaching %u additional"
2844 " padding bytes.\n", padding);
2845 }
2846 if (conn->conn_ops->DataDigest) {
2847 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2848 cmd->buf_ptr, cmd->buf_ptr_size,
2849 padding, (u8 *)&cmd->pad_bytes,
2850 (u8 *)&cmd->data_crc);
2851
2852 iov[niov].iov_base = &cmd->data_crc;
2853 iov[niov++].iov_len = ISCSI_CRC_LEN;
2854 tx_size += ISCSI_CRC_LEN;
2855 pr_debug("Attached DataDigest for %u"
2856 " bytes of ping data, CRC 0x%08x\n",
2857 cmd->buf_ptr_size, cmd->data_crc);
2858 }
2859 }
2860
2861 cmd->iov_misc_count = niov;
2862 cmd->tx_size = tx_size;
2863
2864 pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2865 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2866 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2867
2868 return 0;
2869 }
2870
2871 static int iscsit_send_r2t(
2872 struct iscsi_cmd *cmd,
2873 struct iscsi_conn *conn)
2874 {
2875 int tx_size = 0;
2876 struct iscsi_r2t *r2t;
2877 struct iscsi_r2t_rsp *hdr;
2878 int ret;
2879
2880 r2t = iscsit_get_r2t_from_list(cmd);
2881 if (!r2t)
2882 return -1;
2883
2884 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
2885 memset(hdr, 0, ISCSI_HDR_LEN);
2886 hdr->opcode = ISCSI_OP_R2T;
2887 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2888 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2889 (struct scsi_lun *)&hdr->lun);
2890 hdr->itt = cmd->init_task_tag;
2891 spin_lock_bh(&conn->sess->ttt_lock);
2892 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2893 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2894 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2895 spin_unlock_bh(&conn->sess->ttt_lock);
2896 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
2897 hdr->statsn = cpu_to_be32(conn->stat_sn);
2898 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2899 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2900 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
2901 hdr->data_offset = cpu_to_be32(r2t->offset);
2902 hdr->data_length = cpu_to_be32(r2t->xfer_len);
2903
2904 cmd->iov_misc[0].iov_base = cmd->pdu;
2905 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
2906 tx_size += ISCSI_HDR_LEN;
2907
2908 if (conn->conn_ops->HeaderDigest) {
2909 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2910
2911 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2912 (unsigned char *)hdr, ISCSI_HDR_LEN,
2913 0, NULL, (u8 *)header_digest);
2914
2915 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2916 tx_size += ISCSI_CRC_LEN;
2917 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2918 " PDU 0x%08x\n", *header_digest);
2919 }
2920
2921 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2922 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2923 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2924 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2925 r2t->offset, r2t->xfer_len, conn->cid);
2926
2927 cmd->iov_misc_count = 1;
2928 cmd->tx_size = tx_size;
2929
2930 spin_lock_bh(&cmd->r2t_lock);
2931 r2t->sent_r2t = 1;
2932 spin_unlock_bh(&cmd->r2t_lock);
2933
2934 ret = iscsit_send_tx_data(cmd, conn, 1);
2935 if (ret < 0) {
2936 iscsit_tx_thread_wait_for_tcp(conn);
2937 return ret;
2938 }
2939
2940 spin_lock_bh(&cmd->dataout_timeout_lock);
2941 iscsit_start_dataout_timer(cmd, conn);
2942 spin_unlock_bh(&cmd->dataout_timeout_lock);
2943
2944 return 0;
2945 }
2946
2947 /*
2948 * @recovery: If called from iscsi_task_reassign_complete_write() for
2949 * connection recovery.
2950 */
2951 int iscsit_build_r2ts_for_cmd(
2952 struct iscsi_cmd *cmd,
2953 struct iscsi_conn *conn,
2954 bool recovery)
2955 {
2956 int first_r2t = 1;
2957 u32 offset = 0, xfer_len = 0;
2958
2959 spin_lock_bh(&cmd->r2t_lock);
2960 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2961 spin_unlock_bh(&cmd->r2t_lock);
2962 return 0;
2963 }
2964
2965 if (conn->sess->sess_ops->DataSequenceInOrder &&
2966 !recovery)
2967 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
2968
2969 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2970 if (conn->sess->sess_ops->DataSequenceInOrder) {
2971 offset = cmd->r2t_offset;
2972
2973 if (first_r2t && recovery) {
2974 int new_data_end = offset +
2975 conn->sess->sess_ops->MaxBurstLength -
2976 cmd->next_burst_len;
2977
2978 if (new_data_end > cmd->se_cmd.data_length)
2979 xfer_len = cmd->se_cmd.data_length - offset;
2980 else
2981 xfer_len =
2982 conn->sess->sess_ops->MaxBurstLength -
2983 cmd->next_burst_len;
2984 } else {
2985 int new_data_end = offset +
2986 conn->sess->sess_ops->MaxBurstLength;
2987
2988 if (new_data_end > cmd->se_cmd.data_length)
2989 xfer_len = cmd->se_cmd.data_length - offset;
2990 else
2991 xfer_len = conn->sess->sess_ops->MaxBurstLength;
2992 }
2993 cmd->r2t_offset += xfer_len;
2994
2995 if (cmd->r2t_offset == cmd->se_cmd.data_length)
2996 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2997 } else {
2998 struct iscsi_seq *seq;
2999
3000 seq = iscsit_get_seq_holder_for_r2t(cmd);
3001 if (!seq) {
3002 spin_unlock_bh(&cmd->r2t_lock);
3003 return -1;
3004 }
3005
3006 offset = seq->offset;
3007 xfer_len = seq->xfer_len;
3008
3009 if (cmd->seq_send_order == cmd->seq_count)
3010 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3011 }
3012 cmd->outstanding_r2ts++;
3013 first_r2t = 0;
3014
3015 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3016 spin_unlock_bh(&cmd->r2t_lock);
3017 return -1;
3018 }
3019
3020 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3021 break;
3022 }
3023 spin_unlock_bh(&cmd->r2t_lock);
3024
3025 return 0;
3026 }
3027
3028 static int iscsit_send_status(
3029 struct iscsi_cmd *cmd,
3030 struct iscsi_conn *conn)
3031 {
3032 u8 iov_count = 0, recovery;
3033 u32 padding = 0, tx_size = 0;
3034 struct iscsi_scsi_rsp *hdr;
3035 struct kvec *iov;
3036
3037 recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3038 if (!recovery)
3039 cmd->stat_sn = conn->stat_sn++;
3040
3041 spin_lock_bh(&conn->sess->session_stats_lock);
3042 conn->sess->rsp_pdus++;
3043 spin_unlock_bh(&conn->sess->session_stats_lock);
3044
3045 hdr = (struct iscsi_scsi_rsp *) cmd->pdu;
3046 memset(hdr, 0, ISCSI_HDR_LEN);
3047 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3048 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3049 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3050 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3051 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3052 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3053 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3054 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3055 }
3056 hdr->response = cmd->iscsi_response;
3057 hdr->cmd_status = cmd->se_cmd.scsi_status;
3058 hdr->itt = cmd->init_task_tag;
3059 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3060
3061 iscsit_increment_maxcmdsn(cmd, conn->sess);
3062 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3063 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3064
3065 iov = &cmd->iov_misc[0];
3066 iov[iov_count].iov_base = cmd->pdu;
3067 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3068 tx_size += ISCSI_HDR_LEN;
3069
3070 /*
3071 * Attach SENSE DATA payload to iSCSI Response PDU
3072 */
3073 if (cmd->se_cmd.sense_buffer &&
3074 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3075 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3076 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3077 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3078
3079 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3080 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3081 iov[iov_count].iov_base = cmd->sense_buffer;
3082 iov[iov_count++].iov_len =
3083 (cmd->se_cmd.scsi_sense_length + padding);
3084 tx_size += cmd->se_cmd.scsi_sense_length;
3085
3086 if (padding) {
3087 memset(cmd->sense_buffer +
3088 cmd->se_cmd.scsi_sense_length, 0, padding);
3089 tx_size += padding;
3090 pr_debug("Adding %u bytes of padding to"
3091 " SENSE.\n", padding);
3092 }
3093
3094 if (conn->conn_ops->DataDigest) {
3095 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3096 cmd->sense_buffer,
3097 (cmd->se_cmd.scsi_sense_length + padding),
3098 0, NULL, (u8 *)&cmd->data_crc);
3099
3100 iov[iov_count].iov_base = &cmd->data_crc;
3101 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3102 tx_size += ISCSI_CRC_LEN;
3103
3104 pr_debug("Attaching CRC32 DataDigest for"
3105 " SENSE, %u bytes CRC 0x%08x\n",
3106 (cmd->se_cmd.scsi_sense_length + padding),
3107 cmd->data_crc);
3108 }
3109
3110 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3111 " Response PDU\n",
3112 cmd->se_cmd.scsi_sense_length);
3113 }
3114
3115 if (conn->conn_ops->HeaderDigest) {
3116 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3117
3118 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3119 (unsigned char *)hdr, ISCSI_HDR_LEN,
3120 0, NULL, (u8 *)header_digest);
3121
3122 iov[0].iov_len += ISCSI_CRC_LEN;
3123 tx_size += ISCSI_CRC_LEN;
3124 pr_debug("Attaching CRC32 HeaderDigest for Response"
3125 " PDU 0x%08x\n", *header_digest);
3126 }
3127
3128 cmd->iov_misc_count = iov_count;
3129 cmd->tx_size = tx_size;
3130
3131 pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3132 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3133 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3134 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3135
3136 return 0;
3137 }
3138
3139 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3140 {
3141 switch (se_tmr->response) {
3142 case TMR_FUNCTION_COMPLETE:
3143 return ISCSI_TMF_RSP_COMPLETE;
3144 case TMR_TASK_DOES_NOT_EXIST:
3145 return ISCSI_TMF_RSP_NO_TASK;
3146 case TMR_LUN_DOES_NOT_EXIST:
3147 return ISCSI_TMF_RSP_NO_LUN;
3148 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3149 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3150 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3151 return ISCSI_TMF_RSP_AUTH_FAILED;
3152 case TMR_FUNCTION_REJECTED:
3153 default:
3154 return ISCSI_TMF_RSP_REJECTED;
3155 }
3156 }
3157
3158 static int iscsit_send_task_mgt_rsp(
3159 struct iscsi_cmd *cmd,
3160 struct iscsi_conn *conn)
3161 {
3162 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3163 struct iscsi_tm_rsp *hdr;
3164 u32 tx_size = 0;
3165
3166 hdr = (struct iscsi_tm_rsp *) cmd->pdu;
3167 memset(hdr, 0, ISCSI_HDR_LEN);
3168 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3169 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3170 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3171 hdr->itt = cmd->init_task_tag;
3172 cmd->stat_sn = conn->stat_sn++;
3173 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3174
3175 iscsit_increment_maxcmdsn(cmd, conn->sess);
3176 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3177 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3178
3179 cmd->iov_misc[0].iov_base = cmd->pdu;
3180 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3181 tx_size += ISCSI_HDR_LEN;
3182
3183 if (conn->conn_ops->HeaderDigest) {
3184 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3185
3186 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3187 (unsigned char *)hdr, ISCSI_HDR_LEN,
3188 0, NULL, (u8 *)header_digest);
3189
3190 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3191 tx_size += ISCSI_CRC_LEN;
3192 pr_debug("Attaching CRC32 HeaderDigest for Task"
3193 " Mgmt Response PDU 0x%08x\n", *header_digest);
3194 }
3195
3196 cmd->iov_misc_count = 1;
3197 cmd->tx_size = tx_size;
3198
3199 pr_debug("Built Task Management Response ITT: 0x%08x,"
3200 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3201 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3202
3203 return 0;
3204 }
3205
3206 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3207 {
3208 bool ret = false;
3209
3210 if (np->np_sockaddr.ss_family == AF_INET6) {
3211 const struct sockaddr_in6 sin6 = {
3212 .sin6_addr = IN6ADDR_ANY_INIT };
3213 struct sockaddr_in6 *sock_in6 =
3214 (struct sockaddr_in6 *)&np->np_sockaddr;
3215
3216 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3217 sin6.sin6_addr.s6_addr, 16))
3218 ret = true;
3219 } else {
3220 struct sockaddr_in * sock_in =
3221 (struct sockaddr_in *)&np->np_sockaddr;
3222
3223 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3224 ret = true;
3225 }
3226
3227 return ret;
3228 }
3229
3230 #define SENDTARGETS_BUF_LIMIT 32768U
3231
3232 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3233 {
3234 char *payload = NULL;
3235 struct iscsi_conn *conn = cmd->conn;
3236 struct iscsi_portal_group *tpg;
3237 struct iscsi_tiqn *tiqn;
3238 struct iscsi_tpg_np *tpg_np;
3239 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3240 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3241
3242 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3243 SENDTARGETS_BUF_LIMIT);
3244
3245 payload = kzalloc(buffer_len, GFP_KERNEL);
3246 if (!payload) {
3247 pr_err("Unable to allocate memory for sendtargets"
3248 " response.\n");
3249 return -ENOMEM;
3250 }
3251
3252 spin_lock(&tiqn_lock);
3253 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3254 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3255 len += 1;
3256
3257 if ((len + payload_len) > buffer_len) {
3258 end_of_buf = 1;
3259 goto eob;
3260 }
3261 memcpy(payload + payload_len, buf, len);
3262 payload_len += len;
3263
3264 spin_lock(&tiqn->tiqn_tpg_lock);
3265 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3266
3267 spin_lock(&tpg->tpg_state_lock);
3268 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3269 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3270 spin_unlock(&tpg->tpg_state_lock);
3271 continue;
3272 }
3273 spin_unlock(&tpg->tpg_state_lock);
3274
3275 spin_lock(&tpg->tpg_np_lock);
3276 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3277 tpg_np_list) {
3278 struct iscsi_np *np = tpg_np->tpg_np;
3279 bool inaddr_any = iscsit_check_inaddr_any(np);
3280
3281 len = sprintf(buf, "TargetAddress="
3282 "%s%s%s:%hu,%hu",
3283 (np->np_sockaddr.ss_family == AF_INET6) ?
3284 "[" : "", (inaddr_any == false) ?
3285 np->np_ip : conn->local_ip,
3286 (np->np_sockaddr.ss_family == AF_INET6) ?
3287 "]" : "", (inaddr_any == false) ?
3288 np->np_port : conn->local_port,
3289 tpg->tpgt);
3290 len += 1;
3291
3292 if ((len + payload_len) > buffer_len) {
3293 spin_unlock(&tpg->tpg_np_lock);
3294 spin_unlock(&tiqn->tiqn_tpg_lock);
3295 end_of_buf = 1;
3296 goto eob;
3297 }
3298 memcpy(payload + payload_len, buf, len);
3299 payload_len += len;
3300 }
3301 spin_unlock(&tpg->tpg_np_lock);
3302 }
3303 spin_unlock(&tiqn->tiqn_tpg_lock);
3304 eob:
3305 if (end_of_buf)
3306 break;
3307 }
3308 spin_unlock(&tiqn_lock);
3309
3310 cmd->buf_ptr = payload;
3311
3312 return payload_len;
3313 }
3314
3315 /*
3316 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3317 * MaxRecvDataSegmentLength.
3318 */
3319 static int iscsit_send_text_rsp(
3320 struct iscsi_cmd *cmd,
3321 struct iscsi_conn *conn)
3322 {
3323 struct iscsi_text_rsp *hdr;
3324 struct kvec *iov;
3325 u32 padding = 0, tx_size = 0;
3326 int text_length, iov_count = 0;
3327
3328 text_length = iscsit_build_sendtargets_response(cmd);
3329 if (text_length < 0)
3330 return text_length;
3331
3332 padding = ((-text_length) & 3);
3333 if (padding != 0) {
3334 memset(cmd->buf_ptr + text_length, 0, padding);
3335 pr_debug("Attaching %u additional bytes for"
3336 " padding.\n", padding);
3337 }
3338
3339 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3340 memset(hdr, 0, ISCSI_HDR_LEN);
3341 hdr->opcode = ISCSI_OP_TEXT_RSP;
3342 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3343 hton24(hdr->dlength, text_length);
3344 hdr->itt = cmd->init_task_tag;
3345 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3346 cmd->stat_sn = conn->stat_sn++;
3347 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3348
3349 iscsit_increment_maxcmdsn(cmd, conn->sess);
3350 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3351 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3352
3353 iov = &cmd->iov_misc[0];
3354
3355 iov[iov_count].iov_base = cmd->pdu;
3356 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3357 iov[iov_count].iov_base = cmd->buf_ptr;
3358 iov[iov_count++].iov_len = text_length + padding;
3359
3360 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3361
3362 if (conn->conn_ops->HeaderDigest) {
3363 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3364
3365 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3366 (unsigned char *)hdr, ISCSI_HDR_LEN,
3367 0, NULL, (u8 *)header_digest);
3368
3369 iov[0].iov_len += ISCSI_CRC_LEN;
3370 tx_size += ISCSI_CRC_LEN;
3371 pr_debug("Attaching CRC32 HeaderDigest for"
3372 " Text Response PDU 0x%08x\n", *header_digest);
3373 }
3374
3375 if (conn->conn_ops->DataDigest) {
3376 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3377 cmd->buf_ptr, (text_length + padding),
3378 0, NULL, (u8 *)&cmd->data_crc);
3379
3380 iov[iov_count].iov_base = &cmd->data_crc;
3381 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3382 tx_size += ISCSI_CRC_LEN;
3383
3384 pr_debug("Attaching DataDigest for %u bytes of text"
3385 " data, CRC 0x%08x\n", (text_length + padding),
3386 cmd->data_crc);
3387 }
3388
3389 cmd->iov_misc_count = iov_count;
3390 cmd->tx_size = tx_size;
3391
3392 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3393 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3394 text_length, conn->cid);
3395 return 0;
3396 }
3397
3398 static int iscsit_send_reject(
3399 struct iscsi_cmd *cmd,
3400 struct iscsi_conn *conn)
3401 {
3402 u32 iov_count = 0, tx_size = 0;
3403 struct iscsi_reject *hdr;
3404 struct kvec *iov;
3405
3406 hdr = (struct iscsi_reject *) cmd->pdu;
3407 hdr->opcode = ISCSI_OP_REJECT;
3408 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3409 hton24(hdr->dlength, ISCSI_HDR_LEN);
3410 hdr->ffffffff = cpu_to_be32(0xffffffff);
3411 cmd->stat_sn = conn->stat_sn++;
3412 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3413 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3414 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3415
3416 iov = &cmd->iov_misc[0];
3417
3418 iov[iov_count].iov_base = cmd->pdu;
3419 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3420 iov[iov_count].iov_base = cmd->buf_ptr;
3421 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3422
3423 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3424
3425 if (conn->conn_ops->HeaderDigest) {
3426 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3427
3428 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3429 (unsigned char *)hdr, ISCSI_HDR_LEN,
3430 0, NULL, (u8 *)header_digest);
3431
3432 iov[0].iov_len += ISCSI_CRC_LEN;
3433 tx_size += ISCSI_CRC_LEN;
3434 pr_debug("Attaching CRC32 HeaderDigest for"
3435 " REJECT PDU 0x%08x\n", *header_digest);
3436 }
3437
3438 if (conn->conn_ops->DataDigest) {
3439 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3440 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3441 0, NULL, (u8 *)&cmd->data_crc);
3442
3443 iov[iov_count].iov_base = &cmd->data_crc;
3444 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3445 tx_size += ISCSI_CRC_LEN;
3446 pr_debug("Attaching CRC32 DataDigest for REJECT"
3447 " PDU 0x%08x\n", cmd->data_crc);
3448 }
3449
3450 cmd->iov_misc_count = iov_count;
3451 cmd->tx_size = tx_size;
3452
3453 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3454 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3455
3456 return 0;
3457 }
3458
3459 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3460 {
3461 struct iscsi_thread_set *ts = conn->thread_set;
3462 int ord, cpu;
3463 /*
3464 * thread_id is assigned from iscsit_global->ts_bitmap from
3465 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3466 *
3467 * Here we use thread_id to determine which CPU that this
3468 * iSCSI connection's iscsi_thread_set will be scheduled to
3469 * execute upon.
3470 */
3471 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3472 for_each_online_cpu(cpu) {
3473 if (ord-- == 0) {
3474 cpumask_set_cpu(cpu, conn->conn_cpumask);
3475 return;
3476 }
3477 }
3478 /*
3479 * This should never be reached..
3480 */
3481 dump_stack();
3482 cpumask_setall(conn->conn_cpumask);
3483 }
3484
3485 static inline void iscsit_thread_check_cpumask(
3486 struct iscsi_conn *conn,
3487 struct task_struct *p,
3488 int mode)
3489 {
3490 char buf[128];
3491 /*
3492 * mode == 1 signals iscsi_target_tx_thread() usage.
3493 * mode == 0 signals iscsi_target_rx_thread() usage.
3494 */
3495 if (mode == 1) {
3496 if (!conn->conn_tx_reset_cpumask)
3497 return;
3498 conn->conn_tx_reset_cpumask = 0;
3499 } else {
3500 if (!conn->conn_rx_reset_cpumask)
3501 return;
3502 conn->conn_rx_reset_cpumask = 0;
3503 }
3504 /*
3505 * Update the CPU mask for this single kthread so that
3506 * both TX and RX kthreads are scheduled to run on the
3507 * same CPU.
3508 */
3509 memset(buf, 0, 128);
3510 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3511 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3512 }
3513
3514 static int handle_immediate_queue(struct iscsi_conn *conn)
3515 {
3516 struct iscsi_queue_req *qr;
3517 struct iscsi_cmd *cmd;
3518 u8 state;
3519 int ret;
3520
3521 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3522 atomic_set(&conn->check_immediate_queue, 0);
3523 cmd = qr->cmd;
3524 state = qr->state;
3525 kmem_cache_free(lio_qr_cache, qr);
3526
3527 switch (state) {
3528 case ISTATE_SEND_R2T:
3529 ret = iscsit_send_r2t(cmd, conn);
3530 if (ret < 0)
3531 goto err;
3532 break;
3533 case ISTATE_REMOVE:
3534 if (cmd->data_direction == DMA_TO_DEVICE)
3535 iscsit_stop_dataout_timer(cmd);
3536
3537 spin_lock_bh(&conn->cmd_lock);
3538 list_del(&cmd->i_conn_node);
3539 spin_unlock_bh(&conn->cmd_lock);
3540
3541 iscsit_free_cmd(cmd);
3542 continue;
3543 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3544 iscsit_mod_nopin_response_timer(conn);
3545 ret = iscsit_send_unsolicited_nopin(cmd,
3546 conn, 1);
3547 if (ret < 0)
3548 goto err;
3549 break;
3550 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3551 ret = iscsit_send_unsolicited_nopin(cmd,
3552 conn, 0);
3553 if (ret < 0)
3554 goto err;
3555 break;
3556 default:
3557 pr_err("Unknown Opcode: 0x%02x ITT:"
3558 " 0x%08x, i_state: %d on CID: %hu\n",
3559 cmd->iscsi_opcode, cmd->init_task_tag, state,
3560 conn->cid);
3561 goto err;
3562 }
3563 }
3564
3565 return 0;
3566
3567 err:
3568 return -1;
3569 }
3570
3571 static int handle_response_queue(struct iscsi_conn *conn)
3572 {
3573 struct iscsi_queue_req *qr;
3574 struct iscsi_cmd *cmd;
3575 u8 state;
3576 int ret;
3577
3578 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3579 cmd = qr->cmd;
3580 state = qr->state;
3581 kmem_cache_free(lio_qr_cache, qr);
3582
3583 check_rsp_state:
3584 switch (state) {
3585 case ISTATE_SEND_DATAIN:
3586 ret = iscsit_send_data_in(cmd, conn);
3587 if (ret < 0)
3588 goto err;
3589 else if (!ret)
3590 /* more drs */
3591 goto check_rsp_state;
3592 else if (ret == 1) {
3593 /* all done */
3594 spin_lock_bh(&cmd->istate_lock);
3595 cmd->i_state = ISTATE_SENT_STATUS;
3596 spin_unlock_bh(&cmd->istate_lock);
3597 continue;
3598 } else if (ret == 2) {
3599 /* Still must send status,
3600 SCF_TRANSPORT_TASK_SENSE was set */
3601 spin_lock_bh(&cmd->istate_lock);
3602 cmd->i_state = ISTATE_SEND_STATUS;
3603 spin_unlock_bh(&cmd->istate_lock);
3604 state = ISTATE_SEND_STATUS;
3605 goto check_rsp_state;
3606 }
3607
3608 break;
3609 case ISTATE_SEND_STATUS:
3610 case ISTATE_SEND_STATUS_RECOVERY:
3611 ret = iscsit_send_status(cmd, conn);
3612 break;
3613 case ISTATE_SEND_LOGOUTRSP:
3614 ret = iscsit_send_logout_response(cmd, conn);
3615 break;
3616 case ISTATE_SEND_ASYNCMSG:
3617 ret = iscsit_send_conn_drop_async_message(
3618 cmd, conn);
3619 break;
3620 case ISTATE_SEND_NOPIN:
3621 ret = iscsit_send_nopin_response(cmd, conn);
3622 break;
3623 case ISTATE_SEND_REJECT:
3624 ret = iscsit_send_reject(cmd, conn);
3625 break;
3626 case ISTATE_SEND_TASKMGTRSP:
3627 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3628 if (ret != 0)
3629 break;
3630 ret = iscsit_tmr_post_handler(cmd, conn);
3631 if (ret != 0)
3632 iscsit_fall_back_to_erl0(conn->sess);
3633 break;
3634 case ISTATE_SEND_TEXTRSP:
3635 ret = iscsit_send_text_rsp(cmd, conn);
3636 break;
3637 default:
3638 pr_err("Unknown Opcode: 0x%02x ITT:"
3639 " 0x%08x, i_state: %d on CID: %hu\n",
3640 cmd->iscsi_opcode, cmd->init_task_tag,
3641 state, conn->cid);
3642 goto err;
3643 }
3644 if (ret < 0)
3645 goto err;
3646
3647 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3648 iscsit_tx_thread_wait_for_tcp(conn);
3649 iscsit_unmap_iovec(cmd);
3650 goto err;
3651 }
3652 iscsit_unmap_iovec(cmd);
3653
3654 switch (state) {
3655 case ISTATE_SEND_LOGOUTRSP:
3656 if (!iscsit_logout_post_handler(cmd, conn))
3657 goto restart;
3658 /* fall through */
3659 case ISTATE_SEND_STATUS:
3660 case ISTATE_SEND_ASYNCMSG:
3661 case ISTATE_SEND_NOPIN:
3662 case ISTATE_SEND_STATUS_RECOVERY:
3663 case ISTATE_SEND_TEXTRSP:
3664 case ISTATE_SEND_TASKMGTRSP:
3665 spin_lock_bh(&cmd->istate_lock);
3666 cmd->i_state = ISTATE_SENT_STATUS;
3667 spin_unlock_bh(&cmd->istate_lock);
3668 break;
3669 case ISTATE_SEND_REJECT:
3670 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3671 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3672 complete(&cmd->reject_comp);
3673 goto err;
3674 }
3675 complete(&cmd->reject_comp);
3676 break;
3677 default:
3678 pr_err("Unknown Opcode: 0x%02x ITT:"
3679 " 0x%08x, i_state: %d on CID: %hu\n",
3680 cmd->iscsi_opcode, cmd->init_task_tag,
3681 cmd->i_state, conn->cid);
3682 goto err;
3683 }
3684
3685 if (atomic_read(&conn->check_immediate_queue))
3686 break;
3687 }
3688
3689 return 0;
3690
3691 err:
3692 return -1;
3693 restart:
3694 return -EAGAIN;
3695 }
3696
3697 int iscsi_target_tx_thread(void *arg)
3698 {
3699 int ret = 0;
3700 struct iscsi_conn *conn;
3701 struct iscsi_thread_set *ts = arg;
3702 /*
3703 * Allow ourselves to be interrupted by SIGINT so that a
3704 * connection recovery / failure event can be triggered externally.
3705 */
3706 allow_signal(SIGINT);
3707
3708 restart:
3709 conn = iscsi_tx_thread_pre_handler(ts);
3710 if (!conn)
3711 goto out;
3712
3713 ret = 0;
3714
3715 while (!kthread_should_stop()) {
3716 /*
3717 * Ensure that both TX and RX per connection kthreads
3718 * are scheduled to run on the same CPU.
3719 */
3720 iscsit_thread_check_cpumask(conn, current, 1);
3721
3722 schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
3723
3724 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3725 signal_pending(current))
3726 goto transport_err;
3727
3728 ret = handle_immediate_queue(conn);
3729 if (ret < 0)
3730 goto transport_err;
3731
3732 ret = handle_response_queue(conn);
3733 if (ret == -EAGAIN)
3734 goto restart;
3735 else if (ret < 0)
3736 goto transport_err;
3737 }
3738
3739 transport_err:
3740 iscsit_take_action_for_connection_exit(conn);
3741 goto restart;
3742 out:
3743 return 0;
3744 }
3745
3746 int iscsi_target_rx_thread(void *arg)
3747 {
3748 int ret;
3749 u8 buffer[ISCSI_HDR_LEN], opcode;
3750 u32 checksum = 0, digest = 0;
3751 struct iscsi_conn *conn = NULL;
3752 struct iscsi_thread_set *ts = arg;
3753 struct kvec iov;
3754 /*
3755 * Allow ourselves to be interrupted by SIGINT so that a
3756 * connection recovery / failure event can be triggered externally.
3757 */
3758 allow_signal(SIGINT);
3759
3760 restart:
3761 conn = iscsi_rx_thread_pre_handler(ts);
3762 if (!conn)
3763 goto out;
3764
3765 while (!kthread_should_stop()) {
3766 /*
3767 * Ensure that both TX and RX per connection kthreads
3768 * are scheduled to run on the same CPU.
3769 */
3770 iscsit_thread_check_cpumask(conn, current, 0);
3771
3772 memset(buffer, 0, ISCSI_HDR_LEN);
3773 memset(&iov, 0, sizeof(struct kvec));
3774
3775 iov.iov_base = buffer;
3776 iov.iov_len = ISCSI_HDR_LEN;
3777
3778 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3779 if (ret != ISCSI_HDR_LEN) {
3780 iscsit_rx_thread_wait_for_tcp(conn);
3781 goto transport_err;
3782 }
3783
3784 /*
3785 * Set conn->bad_hdr for use with REJECT PDUs.
3786 */
3787 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3788
3789 if (conn->conn_ops->HeaderDigest) {
3790 iov.iov_base = &digest;
3791 iov.iov_len = ISCSI_CRC_LEN;
3792
3793 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3794 if (ret != ISCSI_CRC_LEN) {
3795 iscsit_rx_thread_wait_for_tcp(conn);
3796 goto transport_err;
3797 }
3798
3799 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3800 buffer, ISCSI_HDR_LEN,
3801 0, NULL, (u8 *)&checksum);
3802
3803 if (digest != checksum) {
3804 pr_err("HeaderDigest CRC32C failed,"
3805 " received 0x%08x, computed 0x%08x\n",
3806 digest, checksum);
3807 /*
3808 * Set the PDU to 0xff so it will intentionally
3809 * hit default in the switch below.
3810 */
3811 memset(buffer, 0xff, ISCSI_HDR_LEN);
3812 spin_lock_bh(&conn->sess->session_stats_lock);
3813 conn->sess->conn_digest_errors++;
3814 spin_unlock_bh(&conn->sess->session_stats_lock);
3815 } else {
3816 pr_debug("Got HeaderDigest CRC32C"
3817 " 0x%08x\n", checksum);
3818 }
3819 }
3820
3821 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3822 goto transport_err;
3823
3824 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3825
3826 if (conn->sess->sess_ops->SessionType &&
3827 ((!(opcode & ISCSI_OP_TEXT)) ||
3828 (!(opcode & ISCSI_OP_LOGOUT)))) {
3829 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3830 " while in Discovery Session, rejecting.\n", opcode);
3831 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3832 buffer, conn);
3833 goto transport_err;
3834 }
3835
3836 switch (opcode) {
3837 case ISCSI_OP_SCSI_CMD:
3838 if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3839 goto transport_err;
3840 break;
3841 case ISCSI_OP_SCSI_DATA_OUT:
3842 if (iscsit_handle_data_out(conn, buffer) < 0)
3843 goto transport_err;
3844 break;
3845 case ISCSI_OP_NOOP_OUT:
3846 if (iscsit_handle_nop_out(conn, buffer) < 0)
3847 goto transport_err;
3848 break;
3849 case ISCSI_OP_SCSI_TMFUNC:
3850 if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3851 goto transport_err;
3852 break;
3853 case ISCSI_OP_TEXT:
3854 if (iscsit_handle_text_cmd(conn, buffer) < 0)
3855 goto transport_err;
3856 break;
3857 case ISCSI_OP_LOGOUT:
3858 ret = iscsit_handle_logout_cmd(conn, buffer);
3859 if (ret > 0) {
3860 wait_for_completion_timeout(&conn->conn_logout_comp,
3861 SECONDS_FOR_LOGOUT_COMP * HZ);
3862 goto transport_err;
3863 } else if (ret < 0)
3864 goto transport_err;
3865 break;
3866 case ISCSI_OP_SNACK:
3867 if (iscsit_handle_snack(conn, buffer) < 0)
3868 goto transport_err;
3869 break;
3870 default:
3871 pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3872 opcode);
3873 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3874 pr_err("Cannot recover from unknown"
3875 " opcode while ERL=0, closing iSCSI connection"
3876 ".\n");
3877 goto transport_err;
3878 }
3879 if (!conn->conn_ops->OFMarker) {
3880 pr_err("Unable to recover from unknown"
3881 " opcode while OFMarker=No, closing iSCSI"
3882 " connection.\n");
3883 goto transport_err;
3884 }
3885 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3886 pr_err("Unable to recover from unknown"
3887 " opcode, closing iSCSI connection.\n");
3888 goto transport_err;
3889 }
3890 break;
3891 }
3892 }
3893
3894 transport_err:
3895 if (!signal_pending(current))
3896 atomic_set(&conn->transport_failed, 1);
3897 iscsit_take_action_for_connection_exit(conn);
3898 goto restart;
3899 out:
3900 return 0;
3901 }
3902
3903 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3904 {
3905 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3906 struct iscsi_session *sess = conn->sess;
3907 /*
3908 * We expect this function to only ever be called from either RX or TX
3909 * thread context via iscsit_close_connection() once the other context
3910 * has been reset -> returned sleeping pre-handler state.
3911 */
3912 spin_lock_bh(&conn->cmd_lock);
3913 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
3914
3915 list_del(&cmd->i_conn_node);
3916 spin_unlock_bh(&conn->cmd_lock);
3917
3918 iscsit_increment_maxcmdsn(cmd, sess);
3919
3920 iscsit_free_cmd(cmd);
3921
3922 spin_lock_bh(&conn->cmd_lock);
3923 }
3924 spin_unlock_bh(&conn->cmd_lock);
3925 }
3926
3927 static void iscsit_stop_timers_for_cmds(
3928 struct iscsi_conn *conn)
3929 {
3930 struct iscsi_cmd *cmd;
3931
3932 spin_lock_bh(&conn->cmd_lock);
3933 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
3934 if (cmd->data_direction == DMA_TO_DEVICE)
3935 iscsit_stop_dataout_timer(cmd);
3936 }
3937 spin_unlock_bh(&conn->cmd_lock);
3938 }
3939
3940 int iscsit_close_connection(
3941 struct iscsi_conn *conn)
3942 {
3943 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3944 struct iscsi_session *sess = conn->sess;
3945
3946 pr_debug("Closing iSCSI connection CID %hu on SID:"
3947 " %u\n", conn->cid, sess->sid);
3948 /*
3949 * Always up conn_logout_comp just in case the RX Thread is sleeping
3950 * and the logout response never got sent because the connection
3951 * failed.
3952 */
3953 complete(&conn->conn_logout_comp);
3954
3955 iscsi_release_thread_set(conn);
3956
3957 iscsit_stop_timers_for_cmds(conn);
3958 iscsit_stop_nopin_response_timer(conn);
3959 iscsit_stop_nopin_timer(conn);
3960 iscsit_free_queue_reqs_for_conn(conn);
3961
3962 /*
3963 * During Connection recovery drop unacknowledged out of order
3964 * commands for this connection, and prepare the other commands
3965 * for realligence.
3966 *
3967 * During normal operation clear the out of order commands (but
3968 * do not free the struct iscsi_ooo_cmdsn's) and release all
3969 * struct iscsi_cmds.
3970 */
3971 if (atomic_read(&conn->connection_recovery)) {
3972 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
3973 iscsit_prepare_cmds_for_realligance(conn);
3974 } else {
3975 iscsit_clear_ooo_cmdsns_for_conn(conn);
3976 iscsit_release_commands_from_conn(conn);
3977 }
3978
3979 /*
3980 * Handle decrementing session or connection usage count if
3981 * a logout response was not able to be sent because the
3982 * connection failed. Fall back to Session Recovery here.
3983 */
3984 if (atomic_read(&conn->conn_logout_remove)) {
3985 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
3986 iscsit_dec_conn_usage_count(conn);
3987 iscsit_dec_session_usage_count(sess);
3988 }
3989 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
3990 iscsit_dec_conn_usage_count(conn);
3991
3992 atomic_set(&conn->conn_logout_remove, 0);
3993 atomic_set(&sess->session_reinstatement, 0);
3994 atomic_set(&sess->session_fall_back_to_erl0, 1);
3995 }
3996
3997 spin_lock_bh(&sess->conn_lock);
3998 list_del(&conn->conn_list);
3999
4000 /*
4001 * Attempt to let the Initiator know this connection failed by
4002 * sending an Connection Dropped Async Message on another
4003 * active connection.
4004 */
4005 if (atomic_read(&conn->connection_recovery))
4006 iscsit_build_conn_drop_async_message(conn);
4007
4008 spin_unlock_bh(&sess->conn_lock);
4009
4010 /*
4011 * If connection reinstatement is being performed on this connection,
4012 * up the connection reinstatement semaphore that is being blocked on
4013 * in iscsit_cause_connection_reinstatement().
4014 */
4015 spin_lock_bh(&conn->state_lock);
4016 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4017 spin_unlock_bh(&conn->state_lock);
4018 complete(&conn->conn_wait_comp);
4019 wait_for_completion(&conn->conn_post_wait_comp);
4020 spin_lock_bh(&conn->state_lock);
4021 }
4022
4023 /*
4024 * If connection reinstatement is being performed on this connection
4025 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4026 * connection wait rcfr semaphore that is being blocked on
4027 * an iscsit_connection_reinstatement_rcfr().
4028 */
4029 if (atomic_read(&conn->connection_wait_rcfr)) {
4030 spin_unlock_bh(&conn->state_lock);
4031 complete(&conn->conn_wait_rcfr_comp);
4032 wait_for_completion(&conn->conn_post_wait_comp);
4033 spin_lock_bh(&conn->state_lock);
4034 }
4035 atomic_set(&conn->connection_reinstatement, 1);
4036 spin_unlock_bh(&conn->state_lock);
4037
4038 /*
4039 * If any other processes are accessing this connection pointer we
4040 * must wait until they have completed.
4041 */
4042 iscsit_check_conn_usage_count(conn);
4043
4044 if (conn->conn_rx_hash.tfm)
4045 crypto_free_hash(conn->conn_rx_hash.tfm);
4046 if (conn->conn_tx_hash.tfm)
4047 crypto_free_hash(conn->conn_tx_hash.tfm);
4048
4049 if (conn->conn_cpumask)
4050 free_cpumask_var(conn->conn_cpumask);
4051
4052 kfree(conn->conn_ops);
4053 conn->conn_ops = NULL;
4054
4055 if (conn->sock)
4056 sock_release(conn->sock);
4057 conn->thread_set = NULL;
4058
4059 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4060 conn->conn_state = TARG_CONN_STATE_FREE;
4061 kfree(conn);
4062
4063 spin_lock_bh(&sess->conn_lock);
4064 atomic_dec(&sess->nconn);
4065 pr_debug("Decremented iSCSI connection count to %hu from node:"
4066 " %s\n", atomic_read(&sess->nconn),
4067 sess->sess_ops->InitiatorName);
4068 /*
4069 * Make sure that if one connection fails in an non ERL=2 iSCSI
4070 * Session that they all fail.
4071 */
4072 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4073 !atomic_read(&sess->session_logout))
4074 atomic_set(&sess->session_fall_back_to_erl0, 1);
4075
4076 /*
4077 * If this was not the last connection in the session, and we are
4078 * performing session reinstatement or falling back to ERL=0, call
4079 * iscsit_stop_session() without sleeping to shutdown the other
4080 * active connections.
4081 */
4082 if (atomic_read(&sess->nconn)) {
4083 if (!atomic_read(&sess->session_reinstatement) &&
4084 !atomic_read(&sess->session_fall_back_to_erl0)) {
4085 spin_unlock_bh(&sess->conn_lock);
4086 return 0;
4087 }
4088 if (!atomic_read(&sess->session_stop_active)) {
4089 atomic_set(&sess->session_stop_active, 1);
4090 spin_unlock_bh(&sess->conn_lock);
4091 iscsit_stop_session(sess, 0, 0);
4092 return 0;
4093 }
4094 spin_unlock_bh(&sess->conn_lock);
4095 return 0;
4096 }
4097
4098 /*
4099 * If this was the last connection in the session and one of the
4100 * following is occurring:
4101 *
4102 * Session Reinstatement is not being performed, and are falling back
4103 * to ERL=0 call iscsit_close_session().
4104 *
4105 * Session Logout was requested. iscsit_close_session() will be called
4106 * elsewhere.
4107 *
4108 * Session Continuation is not being performed, start the Time2Retain
4109 * handler and check if sleep_on_sess_wait_sem is active.
4110 */
4111 if (!atomic_read(&sess->session_reinstatement) &&
4112 atomic_read(&sess->session_fall_back_to_erl0)) {
4113 spin_unlock_bh(&sess->conn_lock);
4114 target_put_session(sess->se_sess);
4115
4116 return 0;
4117 } else if (atomic_read(&sess->session_logout)) {
4118 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4119 sess->session_state = TARG_SESS_STATE_FREE;
4120 spin_unlock_bh(&sess->conn_lock);
4121
4122 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4123 complete(&sess->session_wait_comp);
4124
4125 return 0;
4126 } else {
4127 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4128 sess->session_state = TARG_SESS_STATE_FAILED;
4129
4130 if (!atomic_read(&sess->session_continuation)) {
4131 spin_unlock_bh(&sess->conn_lock);
4132 iscsit_start_time2retain_handler(sess);
4133 } else
4134 spin_unlock_bh(&sess->conn_lock);
4135
4136 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4137 complete(&sess->session_wait_comp);
4138
4139 return 0;
4140 }
4141 spin_unlock_bh(&sess->conn_lock);
4142
4143 return 0;
4144 }
4145
4146 int iscsit_close_session(struct iscsi_session *sess)
4147 {
4148 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4149 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4150
4151 if (atomic_read(&sess->nconn)) {
4152 pr_err("%d connection(s) still exist for iSCSI session"
4153 " to %s\n", atomic_read(&sess->nconn),
4154 sess->sess_ops->InitiatorName);
4155 BUG();
4156 }
4157
4158 spin_lock_bh(&se_tpg->session_lock);
4159 atomic_set(&sess->session_logout, 1);
4160 atomic_set(&sess->session_reinstatement, 1);
4161 iscsit_stop_time2retain_timer(sess);
4162 spin_unlock_bh(&se_tpg->session_lock);
4163
4164 /*
4165 * transport_deregister_session_configfs() will clear the
4166 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4167 * can be setting it again with __transport_register_session() in
4168 * iscsi_post_login_handler() again after the iscsit_stop_session()
4169 * completes in iscsi_np context.
4170 */
4171 transport_deregister_session_configfs(sess->se_sess);
4172
4173 /*
4174 * If any other processes are accessing this session pointer we must
4175 * wait until they have completed. If we are in an interrupt (the
4176 * time2retain handler) and contain and active session usage count we
4177 * restart the timer and exit.
4178 */
4179 if (!in_interrupt()) {
4180 if (iscsit_check_session_usage_count(sess) == 1)
4181 iscsit_stop_session(sess, 1, 1);
4182 } else {
4183 if (iscsit_check_session_usage_count(sess) == 2) {
4184 atomic_set(&sess->session_logout, 0);
4185 iscsit_start_time2retain_handler(sess);
4186 return 0;
4187 }
4188 }
4189
4190 transport_deregister_session(sess->se_sess);
4191
4192 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4193 iscsit_free_connection_recovery_entires(sess);
4194
4195 iscsit_free_all_ooo_cmdsns(sess);
4196
4197 spin_lock_bh(&se_tpg->session_lock);
4198 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4199 sess->session_state = TARG_SESS_STATE_FREE;
4200 pr_debug("Released iSCSI session from node: %s\n",
4201 sess->sess_ops->InitiatorName);
4202 tpg->nsessions--;
4203 if (tpg->tpg_tiqn)
4204 tpg->tpg_tiqn->tiqn_nsessions--;
4205
4206 pr_debug("Decremented number of active iSCSI Sessions on"
4207 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4208
4209 spin_lock(&sess_idr_lock);
4210 idr_remove(&sess_idr, sess->session_index);
4211 spin_unlock(&sess_idr_lock);
4212
4213 kfree(sess->sess_ops);
4214 sess->sess_ops = NULL;
4215 spin_unlock_bh(&se_tpg->session_lock);
4216
4217 kfree(sess);
4218 return 0;
4219 }
4220
4221 static void iscsit_logout_post_handler_closesession(
4222 struct iscsi_conn *conn)
4223 {
4224 struct iscsi_session *sess = conn->sess;
4225
4226 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4227 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4228
4229 atomic_set(&conn->conn_logout_remove, 0);
4230 complete(&conn->conn_logout_comp);
4231
4232 iscsit_dec_conn_usage_count(conn);
4233 iscsit_stop_session(sess, 1, 1);
4234 iscsit_dec_session_usage_count(sess);
4235 target_put_session(sess->se_sess);
4236 }
4237
4238 static void iscsit_logout_post_handler_samecid(
4239 struct iscsi_conn *conn)
4240 {
4241 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4242 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4243
4244 atomic_set(&conn->conn_logout_remove, 0);
4245 complete(&conn->conn_logout_comp);
4246
4247 iscsit_cause_connection_reinstatement(conn, 1);
4248 iscsit_dec_conn_usage_count(conn);
4249 }
4250
4251 static void iscsit_logout_post_handler_diffcid(
4252 struct iscsi_conn *conn,
4253 u16 cid)
4254 {
4255 struct iscsi_conn *l_conn;
4256 struct iscsi_session *sess = conn->sess;
4257
4258 if (!sess)
4259 return;
4260
4261 spin_lock_bh(&sess->conn_lock);
4262 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4263 if (l_conn->cid == cid) {
4264 iscsit_inc_conn_usage_count(l_conn);
4265 break;
4266 }
4267 }
4268 spin_unlock_bh(&sess->conn_lock);
4269
4270 if (!l_conn)
4271 return;
4272
4273 if (l_conn->sock)
4274 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4275
4276 spin_lock_bh(&l_conn->state_lock);
4277 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4278 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4279 spin_unlock_bh(&l_conn->state_lock);
4280
4281 iscsit_cause_connection_reinstatement(l_conn, 1);
4282 iscsit_dec_conn_usage_count(l_conn);
4283 }
4284
4285 /*
4286 * Return of 0 causes the TX thread to restart.
4287 */
4288 static int iscsit_logout_post_handler(
4289 struct iscsi_cmd *cmd,
4290 struct iscsi_conn *conn)
4291 {
4292 int ret = 0;
4293
4294 switch (cmd->logout_reason) {
4295 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4296 switch (cmd->logout_response) {
4297 case ISCSI_LOGOUT_SUCCESS:
4298 case ISCSI_LOGOUT_CLEANUP_FAILED:
4299 default:
4300 iscsit_logout_post_handler_closesession(conn);
4301 break;
4302 }
4303 ret = 0;
4304 break;
4305 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4306 if (conn->cid == cmd->logout_cid) {
4307 switch (cmd->logout_response) {
4308 case ISCSI_LOGOUT_SUCCESS:
4309 case ISCSI_LOGOUT_CLEANUP_FAILED:
4310 default:
4311 iscsit_logout_post_handler_samecid(conn);
4312 break;
4313 }
4314 ret = 0;
4315 } else {
4316 switch (cmd->logout_response) {
4317 case ISCSI_LOGOUT_SUCCESS:
4318 iscsit_logout_post_handler_diffcid(conn,
4319 cmd->logout_cid);
4320 break;
4321 case ISCSI_LOGOUT_CID_NOT_FOUND:
4322 case ISCSI_LOGOUT_CLEANUP_FAILED:
4323 default:
4324 break;
4325 }
4326 ret = 1;
4327 }
4328 break;
4329 case ISCSI_LOGOUT_REASON_RECOVERY:
4330 switch (cmd->logout_response) {
4331 case ISCSI_LOGOUT_SUCCESS:
4332 case ISCSI_LOGOUT_CID_NOT_FOUND:
4333 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4334 case ISCSI_LOGOUT_CLEANUP_FAILED:
4335 default:
4336 break;
4337 }
4338 ret = 1;
4339 break;
4340 default:
4341 break;
4342
4343 }
4344 return ret;
4345 }
4346
4347 void iscsit_fail_session(struct iscsi_session *sess)
4348 {
4349 struct iscsi_conn *conn;
4350
4351 spin_lock_bh(&sess->conn_lock);
4352 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4353 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4354 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4355 }
4356 spin_unlock_bh(&sess->conn_lock);
4357
4358 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4359 sess->session_state = TARG_SESS_STATE_FAILED;
4360 }
4361
4362 int iscsit_free_session(struct iscsi_session *sess)
4363 {
4364 u16 conn_count = atomic_read(&sess->nconn);
4365 struct iscsi_conn *conn, *conn_tmp = NULL;
4366 int is_last;
4367
4368 spin_lock_bh(&sess->conn_lock);
4369 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4370
4371 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4372 conn_list) {
4373 if (conn_count == 0)
4374 break;
4375
4376 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4377 is_last = 1;
4378 } else {
4379 iscsit_inc_conn_usage_count(conn_tmp);
4380 is_last = 0;
4381 }
4382 iscsit_inc_conn_usage_count(conn);
4383
4384 spin_unlock_bh(&sess->conn_lock);
4385 iscsit_cause_connection_reinstatement(conn, 1);
4386 spin_lock_bh(&sess->conn_lock);
4387
4388 iscsit_dec_conn_usage_count(conn);
4389 if (is_last == 0)
4390 iscsit_dec_conn_usage_count(conn_tmp);
4391
4392 conn_count--;
4393 }
4394
4395 if (atomic_read(&sess->nconn)) {
4396 spin_unlock_bh(&sess->conn_lock);
4397 wait_for_completion(&sess->session_wait_comp);
4398 } else
4399 spin_unlock_bh(&sess->conn_lock);
4400
4401 target_put_session(sess->se_sess);
4402 return 0;
4403 }
4404
4405 void iscsit_stop_session(
4406 struct iscsi_session *sess,
4407 int session_sleep,
4408 int connection_sleep)
4409 {
4410 u16 conn_count = atomic_read(&sess->nconn);
4411 struct iscsi_conn *conn, *conn_tmp = NULL;
4412 int is_last;
4413
4414 spin_lock_bh(&sess->conn_lock);
4415 if (session_sleep)
4416 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4417
4418 if (connection_sleep) {
4419 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4420 conn_list) {
4421 if (conn_count == 0)
4422 break;
4423
4424 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4425 is_last = 1;
4426 } else {
4427 iscsit_inc_conn_usage_count(conn_tmp);
4428 is_last = 0;
4429 }
4430 iscsit_inc_conn_usage_count(conn);
4431
4432 spin_unlock_bh(&sess->conn_lock);
4433 iscsit_cause_connection_reinstatement(conn, 1);
4434 spin_lock_bh(&sess->conn_lock);
4435
4436 iscsit_dec_conn_usage_count(conn);
4437 if (is_last == 0)
4438 iscsit_dec_conn_usage_count(conn_tmp);
4439 conn_count--;
4440 }
4441 } else {
4442 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4443 iscsit_cause_connection_reinstatement(conn, 0);
4444 }
4445
4446 if (session_sleep && atomic_read(&sess->nconn)) {
4447 spin_unlock_bh(&sess->conn_lock);
4448 wait_for_completion(&sess->session_wait_comp);
4449 } else
4450 spin_unlock_bh(&sess->conn_lock);
4451 }
4452
4453 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4454 {
4455 struct iscsi_session *sess;
4456 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4457 struct se_session *se_sess, *se_sess_tmp;
4458 int session_count = 0;
4459
4460 spin_lock_bh(&se_tpg->session_lock);
4461 if (tpg->nsessions && !force) {
4462 spin_unlock_bh(&se_tpg->session_lock);
4463 return -1;
4464 }
4465
4466 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4467 sess_list) {
4468 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4469
4470 spin_lock(&sess->conn_lock);
4471 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4472 atomic_read(&sess->session_logout) ||
4473 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4474 spin_unlock(&sess->conn_lock);
4475 continue;
4476 }
4477 atomic_set(&sess->session_reinstatement, 1);
4478 spin_unlock(&sess->conn_lock);
4479 spin_unlock_bh(&se_tpg->session_lock);
4480
4481 iscsit_free_session(sess);
4482 spin_lock_bh(&se_tpg->session_lock);
4483
4484 session_count++;
4485 }
4486 spin_unlock_bh(&se_tpg->session_lock);
4487
4488 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4489 " Group: %hu\n", session_count, tpg->tpgt);
4490 return 0;
4491 }
4492
4493 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4494 MODULE_VERSION("4.1.x");
4495 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4496 MODULE_LICENSE("GPL");
4497
4498 module_init(iscsi_target_init_module);
4499 module_exit(iscsi_target_cleanup_module);
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