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Merge branch 'drm-next' of ../main_line/linux-drm into dave-drm-next
[deliverable/linux.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 int iscsit_del_np_comm(struct iscsi_np *np)
431 {
432 if (!np->np_socket)
433 return 0;
434
435 /*
436 * Some network transports allocate their own struct sock->file,
437 * see if we need to free any additional allocated resources.
438 */
439 if (np->np_flags & NPF_SCTP_STRUCT_FILE) {
440 kfree(np->np_socket->file);
441 np->np_socket->file = NULL;
442 }
443
444 sock_release(np->np_socket);
445 return 0;
446 }
447
448 int iscsit_del_np(struct iscsi_np *np)
449 {
450 spin_lock_bh(&np->np_thread_lock);
451 np->np_exports--;
452 if (np->np_exports) {
453 spin_unlock_bh(&np->np_thread_lock);
454 return 0;
455 }
456 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
457 spin_unlock_bh(&np->np_thread_lock);
458
459 if (np->np_thread) {
460 /*
461 * We need to send the signal to wakeup Linux/Net
462 * which may be sleeping in sock_accept()..
463 */
464 send_sig(SIGINT, np->np_thread, 1);
465 kthread_stop(np->np_thread);
466 }
467 iscsit_del_np_comm(np);
468
469 spin_lock_bh(&np_lock);
470 list_del(&np->np_list);
471 spin_unlock_bh(&np_lock);
472
473 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
474 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
475 "TCP" : "SCTP");
476
477 kfree(np);
478 return 0;
479 }
480
481 static int __init iscsi_target_init_module(void)
482 {
483 int ret = 0;
484
485 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
486
487 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
488 if (!iscsit_global) {
489 pr_err("Unable to allocate memory for iscsit_global\n");
490 return -1;
491 }
492 mutex_init(&auth_id_lock);
493 spin_lock_init(&sess_idr_lock);
494 idr_init(&tiqn_idr);
495 idr_init(&sess_idr);
496
497 ret = iscsi_target_register_configfs();
498 if (ret < 0)
499 goto out;
500
501 ret = iscsi_thread_set_init();
502 if (ret < 0)
503 goto configfs_out;
504
505 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
506 TARGET_THREAD_SET_COUNT) {
507 pr_err("iscsi_allocate_thread_sets() returned"
508 " unexpected value!\n");
509 goto ts_out1;
510 }
511
512 lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
513 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
514 0, NULL);
515 if (!lio_cmd_cache) {
516 pr_err("Unable to kmem_cache_create() for"
517 " lio_cmd_cache\n");
518 goto ts_out2;
519 }
520
521 lio_qr_cache = kmem_cache_create("lio_qr_cache",
522 sizeof(struct iscsi_queue_req),
523 __alignof__(struct iscsi_queue_req), 0, NULL);
524 if (!lio_qr_cache) {
525 pr_err("nable to kmem_cache_create() for"
526 " lio_qr_cache\n");
527 goto cmd_out;
528 }
529
530 lio_dr_cache = kmem_cache_create("lio_dr_cache",
531 sizeof(struct iscsi_datain_req),
532 __alignof__(struct iscsi_datain_req), 0, NULL);
533 if (!lio_dr_cache) {
534 pr_err("Unable to kmem_cache_create() for"
535 " lio_dr_cache\n");
536 goto qr_out;
537 }
538
539 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
540 sizeof(struct iscsi_ooo_cmdsn),
541 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
542 if (!lio_ooo_cache) {
543 pr_err("Unable to kmem_cache_create() for"
544 " lio_ooo_cache\n");
545 goto dr_out;
546 }
547
548 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
549 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
550 0, NULL);
551 if (!lio_r2t_cache) {
552 pr_err("Unable to kmem_cache_create() for"
553 " lio_r2t_cache\n");
554 goto ooo_out;
555 }
556
557 if (iscsit_load_discovery_tpg() < 0)
558 goto r2t_out;
559
560 return ret;
561 r2t_out:
562 kmem_cache_destroy(lio_r2t_cache);
563 ooo_out:
564 kmem_cache_destroy(lio_ooo_cache);
565 dr_out:
566 kmem_cache_destroy(lio_dr_cache);
567 qr_out:
568 kmem_cache_destroy(lio_qr_cache);
569 cmd_out:
570 kmem_cache_destroy(lio_cmd_cache);
571 ts_out2:
572 iscsi_deallocate_thread_sets();
573 ts_out1:
574 iscsi_thread_set_free();
575 configfs_out:
576 iscsi_target_deregister_configfs();
577 out:
578 kfree(iscsit_global);
579 return -ENOMEM;
580 }
581
582 static void __exit iscsi_target_cleanup_module(void)
583 {
584 iscsi_deallocate_thread_sets();
585 iscsi_thread_set_free();
586 iscsit_release_discovery_tpg();
587 kmem_cache_destroy(lio_cmd_cache);
588 kmem_cache_destroy(lio_qr_cache);
589 kmem_cache_destroy(lio_dr_cache);
590 kmem_cache_destroy(lio_ooo_cache);
591 kmem_cache_destroy(lio_r2t_cache);
592
593 iscsi_target_deregister_configfs();
594
595 kfree(iscsit_global);
596 }
597
598 static int iscsit_add_reject(
599 u8 reason,
600 int fail_conn,
601 unsigned char *buf,
602 struct iscsi_conn *conn)
603 {
604 struct iscsi_cmd *cmd;
605 struct iscsi_reject *hdr;
606 int ret;
607
608 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
609 if (!cmd)
610 return -1;
611
612 cmd->iscsi_opcode = ISCSI_OP_REJECT;
613 if (fail_conn)
614 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
615
616 hdr = (struct iscsi_reject *) cmd->pdu;
617 hdr->reason = reason;
618
619 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
620 if (!cmd->buf_ptr) {
621 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
622 iscsit_release_cmd(cmd);
623 return -1;
624 }
625
626 spin_lock_bh(&conn->cmd_lock);
627 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
628 spin_unlock_bh(&conn->cmd_lock);
629
630 cmd->i_state = ISTATE_SEND_REJECT;
631 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
632
633 ret = wait_for_completion_interruptible(&cmd->reject_comp);
634 if (ret != 0)
635 return -1;
636
637 return (!fail_conn) ? 0 : -1;
638 }
639
640 int iscsit_add_reject_from_cmd(
641 u8 reason,
642 int fail_conn,
643 int add_to_conn,
644 unsigned char *buf,
645 struct iscsi_cmd *cmd)
646 {
647 struct iscsi_conn *conn;
648 struct iscsi_reject *hdr;
649 int ret;
650
651 if (!cmd->conn) {
652 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
653 cmd->init_task_tag);
654 return -1;
655 }
656 conn = cmd->conn;
657
658 cmd->iscsi_opcode = ISCSI_OP_REJECT;
659 if (fail_conn)
660 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
661
662 hdr = (struct iscsi_reject *) cmd->pdu;
663 hdr->reason = reason;
664
665 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
666 if (!cmd->buf_ptr) {
667 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
668 iscsit_release_cmd(cmd);
669 return -1;
670 }
671
672 if (add_to_conn) {
673 spin_lock_bh(&conn->cmd_lock);
674 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
675 spin_unlock_bh(&conn->cmd_lock);
676 }
677
678 cmd->i_state = ISTATE_SEND_REJECT;
679 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
680
681 ret = wait_for_completion_interruptible(&cmd->reject_comp);
682 if (ret != 0)
683 return -1;
684
685 return (!fail_conn) ? 0 : -1;
686 }
687
688 /*
689 * Map some portion of the allocated scatterlist to an iovec, suitable for
690 * kernel sockets to copy data in/out.
691 */
692 static int iscsit_map_iovec(
693 struct iscsi_cmd *cmd,
694 struct kvec *iov,
695 u32 data_offset,
696 u32 data_length)
697 {
698 u32 i = 0;
699 struct scatterlist *sg;
700 unsigned int page_off;
701
702 /*
703 * We know each entry in t_data_sg contains a page.
704 */
705 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
706 page_off = (data_offset % PAGE_SIZE);
707
708 cmd->first_data_sg = sg;
709 cmd->first_data_sg_off = page_off;
710
711 while (data_length) {
712 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
713
714 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
715 iov[i].iov_len = cur_len;
716
717 data_length -= cur_len;
718 page_off = 0;
719 sg = sg_next(sg);
720 i++;
721 }
722
723 cmd->kmapped_nents = i;
724
725 return i;
726 }
727
728 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
729 {
730 u32 i;
731 struct scatterlist *sg;
732
733 sg = cmd->first_data_sg;
734
735 for (i = 0; i < cmd->kmapped_nents; i++)
736 kunmap(sg_page(&sg[i]));
737 }
738
739 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
740 {
741 struct iscsi_cmd *cmd;
742
743 conn->exp_statsn = exp_statsn;
744
745 spin_lock_bh(&conn->cmd_lock);
746 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
747 spin_lock(&cmd->istate_lock);
748 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
749 (cmd->stat_sn < exp_statsn)) {
750 cmd->i_state = ISTATE_REMOVE;
751 spin_unlock(&cmd->istate_lock);
752 iscsit_add_cmd_to_immediate_queue(cmd, conn,
753 cmd->i_state);
754 continue;
755 }
756 spin_unlock(&cmd->istate_lock);
757 }
758 spin_unlock_bh(&conn->cmd_lock);
759 }
760
761 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
762 {
763 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
764
765 iov_count += ISCSI_IOV_DATA_BUFFER;
766
767 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
768 if (!cmd->iov_data) {
769 pr_err("Unable to allocate cmd->iov_data\n");
770 return -ENOMEM;
771 }
772
773 cmd->orig_iov_data_count = iov_count;
774 return 0;
775 }
776
777 static int iscsit_handle_scsi_cmd(
778 struct iscsi_conn *conn,
779 unsigned char *buf)
780 {
781 int data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
782 int dump_immediate_data = 0, send_check_condition = 0, payload_length;
783 struct iscsi_cmd *cmd = NULL;
784 struct iscsi_scsi_req *hdr;
785 int iscsi_task_attr;
786 int sam_task_attr;
787
788 spin_lock_bh(&conn->sess->session_stats_lock);
789 conn->sess->cmd_pdus++;
790 if (conn->sess->se_sess->se_node_acl) {
791 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
792 conn->sess->se_sess->se_node_acl->num_cmds++;
793 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
794 }
795 spin_unlock_bh(&conn->sess->session_stats_lock);
796
797 hdr = (struct iscsi_scsi_req *) buf;
798 payload_length = ntoh24(hdr->dlength);
799 hdr->itt = be32_to_cpu(hdr->itt);
800 hdr->data_length = be32_to_cpu(hdr->data_length);
801 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
802 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
803
804 /* FIXME; Add checks for AdditionalHeaderSegment */
805
806 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
807 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
808 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
809 " not set. Bad iSCSI Initiator.\n");
810 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
811 buf, conn);
812 }
813
814 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
815 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
816 /*
817 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
818 * that adds support for RESERVE/RELEASE. There is a bug
819 * add with this new functionality that sets R/W bits when
820 * neither CDB carries any READ or WRITE datapayloads.
821 */
822 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
823 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
824 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
825 goto done;
826 }
827
828 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
829 " set when Expected Data Transfer Length is 0 for"
830 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
831 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
832 buf, conn);
833 }
834 done:
835
836 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
837 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
838 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
839 " MUST be set if Expected Data Transfer Length is not 0."
840 " Bad iSCSI Initiator\n");
841 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
842 buf, conn);
843 }
844
845 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
846 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
847 pr_err("Bidirectional operations not supported!\n");
848 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
849 buf, conn);
850 }
851
852 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
853 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
854 " Scsi Command PDU.\n");
855 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
856 buf, conn);
857 }
858
859 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
860 pr_err("ImmediateData=No but DataSegmentLength=%u,"
861 " protocol error.\n", payload_length);
862 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
863 buf, conn);
864 }
865
866 if ((hdr->data_length == payload_length) &&
867 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
868 pr_err("Expected Data Transfer Length and Length of"
869 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
870 " bit is not set protocol error\n");
871 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
872 buf, conn);
873 }
874
875 if (payload_length > hdr->data_length) {
876 pr_err("DataSegmentLength: %u is greater than"
877 " EDTL: %u, protocol error.\n", payload_length,
878 hdr->data_length);
879 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
880 buf, conn);
881 }
882
883 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
884 pr_err("DataSegmentLength: %u is greater than"
885 " MaxRecvDataSegmentLength: %u, protocol error.\n",
886 payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
887 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
888 buf, conn);
889 }
890
891 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
892 pr_err("DataSegmentLength: %u is greater than"
893 " FirstBurstLength: %u, protocol error.\n",
894 payload_length, conn->sess->sess_ops->FirstBurstLength);
895 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
896 buf, conn);
897 }
898
899 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
900 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
901 DMA_NONE;
902
903 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
904 if (!cmd)
905 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
906 buf, conn);
907
908 cmd->data_direction = data_direction;
909 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
910 /*
911 * Figure out the SAM Task Attribute for the incoming SCSI CDB
912 */
913 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
914 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
915 sam_task_attr = MSG_SIMPLE_TAG;
916 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
917 sam_task_attr = MSG_ORDERED_TAG;
918 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
919 sam_task_attr = MSG_HEAD_TAG;
920 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
921 sam_task_attr = MSG_ACA_TAG;
922 else {
923 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
924 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
925 sam_task_attr = MSG_SIMPLE_TAG;
926 }
927
928 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
929 cmd->i_state = ISTATE_NEW_CMD;
930 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
931 cmd->immediate_data = (payload_length) ? 1 : 0;
932 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
933 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
934 if (cmd->unsolicited_data)
935 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
936
937 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
938 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
939 spin_lock_bh(&conn->sess->ttt_lock);
940 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
941 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
942 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
943 spin_unlock_bh(&conn->sess->ttt_lock);
944 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
945 cmd->targ_xfer_tag = 0xFFFFFFFF;
946 cmd->cmd_sn = hdr->cmdsn;
947 cmd->exp_stat_sn = hdr->exp_statsn;
948 cmd->first_burst_len = payload_length;
949
950 if (cmd->data_direction == DMA_FROM_DEVICE) {
951 struct iscsi_datain_req *dr;
952
953 dr = iscsit_allocate_datain_req();
954 if (!dr)
955 return iscsit_add_reject_from_cmd(
956 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
957 1, 1, buf, cmd);
958
959 iscsit_attach_datain_req(cmd, dr);
960 }
961
962 /*
963 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
964 */
965 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
966 conn->sess->se_sess, hdr->data_length, cmd->data_direction,
967 sam_task_attr, &cmd->sense_buffer[0]);
968
969 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
970 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
971 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
972
973 /*
974 * The CDB is going to an se_device_t.
975 */
976 ret = transport_lookup_cmd_lun(&cmd->se_cmd,
977 scsilun_to_int(&hdr->lun));
978 if (ret < 0) {
979 if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
980 pr_debug("Responding to non-acl'ed,"
981 " non-existent or non-exported iSCSI LUN:"
982 " 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
983 }
984 send_check_condition = 1;
985 goto attach_cmd;
986 }
987
988 transport_ret = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
989 if (transport_ret == -ENOMEM) {
990 return iscsit_add_reject_from_cmd(
991 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
992 1, 1, buf, cmd);
993 } else if (transport_ret < 0) {
994 /*
995 * Unsupported SAM Opcode. CHECK_CONDITION will be sent
996 * in iscsit_execute_cmd() during the CmdSN OOO Execution
997 * Mechinism.
998 */
999 send_check_condition = 1;
1000 } else {
1001 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0)
1002 return iscsit_add_reject_from_cmd(
1003 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1004 1, 1, buf, cmd);
1005 }
1006
1007 attach_cmd:
1008 spin_lock_bh(&conn->cmd_lock);
1009 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1010 spin_unlock_bh(&conn->cmd_lock);
1011 /*
1012 * Check if we need to delay processing because of ALUA
1013 * Active/NonOptimized primary access state..
1014 */
1015 core_alua_check_nonop_delay(&cmd->se_cmd);
1016
1017 ret = iscsit_allocate_iovecs(cmd);
1018 if (ret < 0)
1019 return iscsit_add_reject_from_cmd(
1020 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1021 1, 0, buf, cmd);
1022 /*
1023 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1024 * the Immediate Bit is not set, and no Immediate
1025 * Data is attached.
1026 *
1027 * A PDU/CmdSN carrying Immediate Data can only
1028 * be processed after the DataCRC has passed.
1029 * If the DataCRC fails, the CmdSN MUST NOT
1030 * be acknowledged. (See below)
1031 */
1032 if (!cmd->immediate_data) {
1033 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1034 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1035 return 0;
1036 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1037 return iscsit_add_reject_from_cmd(
1038 ISCSI_REASON_PROTOCOL_ERROR,
1039 1, 0, buf, cmd);
1040 }
1041
1042 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1043
1044 /*
1045 * If no Immediate Data is attached, it's OK to return now.
1046 */
1047 if (!cmd->immediate_data) {
1048 if (send_check_condition)
1049 return 0;
1050
1051 if (cmd->unsolicited_data) {
1052 iscsit_set_dataout_sequence_values(cmd);
1053
1054 spin_lock_bh(&cmd->dataout_timeout_lock);
1055 iscsit_start_dataout_timer(cmd, cmd->conn);
1056 spin_unlock_bh(&cmd->dataout_timeout_lock);
1057 }
1058
1059 return 0;
1060 }
1061
1062 /*
1063 * Early CHECK_CONDITIONs never make it to the transport processing
1064 * thread. They are processed in CmdSN order by
1065 * iscsit_check_received_cmdsn() below.
1066 */
1067 if (send_check_condition) {
1068 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1069 dump_immediate_data = 1;
1070 goto after_immediate_data;
1071 }
1072 /*
1073 * Call directly into transport_generic_new_cmd() to perform
1074 * the backend memory allocation.
1075 */
1076 ret = transport_generic_new_cmd(&cmd->se_cmd);
1077 if (ret < 0) {
1078 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1079 dump_immediate_data = 1;
1080 goto after_immediate_data;
1081 }
1082
1083 immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1084 after_immediate_data:
1085 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1086 /*
1087 * A PDU/CmdSN carrying Immediate Data passed
1088 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1089 * Immediate Bit is not set.
1090 */
1091 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1092 /*
1093 * Special case for Unsupported SAM WRITE Opcodes
1094 * and ImmediateData=Yes.
1095 */
1096 if (dump_immediate_data) {
1097 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1098 return -1;
1099 } else if (cmd->unsolicited_data) {
1100 iscsit_set_dataout_sequence_values(cmd);
1101
1102 spin_lock_bh(&cmd->dataout_timeout_lock);
1103 iscsit_start_dataout_timer(cmd, cmd->conn);
1104 spin_unlock_bh(&cmd->dataout_timeout_lock);
1105 }
1106
1107 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1108 return iscsit_add_reject_from_cmd(
1109 ISCSI_REASON_PROTOCOL_ERROR,
1110 1, 0, buf, cmd);
1111
1112 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1113 /*
1114 * Immediate Data failed DataCRC and ERL>=1,
1115 * silently drop this PDU and let the initiator
1116 * plug the CmdSN gap.
1117 *
1118 * FIXME: Send Unsolicited NOPIN with reserved
1119 * TTT here to help the initiator figure out
1120 * the missing CmdSN, although they should be
1121 * intelligent enough to determine the missing
1122 * CmdSN and issue a retry to plug the sequence.
1123 */
1124 cmd->i_state = ISTATE_REMOVE;
1125 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1126 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1127 return -1;
1128
1129 return 0;
1130 }
1131
1132 static u32 iscsit_do_crypto_hash_sg(
1133 struct hash_desc *hash,
1134 struct iscsi_cmd *cmd,
1135 u32 data_offset,
1136 u32 data_length,
1137 u32 padding,
1138 u8 *pad_bytes)
1139 {
1140 u32 data_crc;
1141 u32 i;
1142 struct scatterlist *sg;
1143 unsigned int page_off;
1144
1145 crypto_hash_init(hash);
1146
1147 sg = cmd->first_data_sg;
1148 page_off = cmd->first_data_sg_off;
1149
1150 i = 0;
1151 while (data_length) {
1152 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1153
1154 crypto_hash_update(hash, &sg[i], cur_len);
1155
1156 data_length -= cur_len;
1157 page_off = 0;
1158 i++;
1159 }
1160
1161 if (padding) {
1162 struct scatterlist pad_sg;
1163
1164 sg_init_one(&pad_sg, pad_bytes, padding);
1165 crypto_hash_update(hash, &pad_sg, padding);
1166 }
1167 crypto_hash_final(hash, (u8 *) &data_crc);
1168
1169 return data_crc;
1170 }
1171
1172 static void iscsit_do_crypto_hash_buf(
1173 struct hash_desc *hash,
1174 unsigned char *buf,
1175 u32 payload_length,
1176 u32 padding,
1177 u8 *pad_bytes,
1178 u8 *data_crc)
1179 {
1180 struct scatterlist sg;
1181
1182 crypto_hash_init(hash);
1183
1184 sg_init_one(&sg, buf, payload_length);
1185 crypto_hash_update(hash, &sg, payload_length);
1186
1187 if (padding) {
1188 sg_init_one(&sg, pad_bytes, padding);
1189 crypto_hash_update(hash, &sg, padding);
1190 }
1191 crypto_hash_final(hash, data_crc);
1192 }
1193
1194 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1195 {
1196 int iov_ret, ooo_cmdsn = 0, ret;
1197 u8 data_crc_failed = 0;
1198 u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1199 u32 rx_size = 0, payload_length;
1200 struct iscsi_cmd *cmd = NULL;
1201 struct se_cmd *se_cmd;
1202 struct iscsi_data *hdr;
1203 struct kvec *iov;
1204 unsigned long flags;
1205
1206 hdr = (struct iscsi_data *) buf;
1207 payload_length = ntoh24(hdr->dlength);
1208 hdr->itt = be32_to_cpu(hdr->itt);
1209 hdr->ttt = be32_to_cpu(hdr->ttt);
1210 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1211 hdr->datasn = be32_to_cpu(hdr->datasn);
1212 hdr->offset = be32_to_cpu(hdr->offset);
1213
1214 if (!payload_length) {
1215 pr_err("DataOUT payload is ZERO, protocol error.\n");
1216 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1217 buf, conn);
1218 }
1219
1220 /* iSCSI write */
1221 spin_lock_bh(&conn->sess->session_stats_lock);
1222 conn->sess->rx_data_octets += payload_length;
1223 if (conn->sess->se_sess->se_node_acl) {
1224 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1225 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1226 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1227 }
1228 spin_unlock_bh(&conn->sess->session_stats_lock);
1229
1230 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1231 pr_err("DataSegmentLength: %u is greater than"
1232 " MaxRecvDataSegmentLength: %u\n", payload_length,
1233 conn->conn_ops->MaxRecvDataSegmentLength);
1234 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1235 buf, conn);
1236 }
1237
1238 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1239 payload_length);
1240 if (!cmd)
1241 return 0;
1242
1243 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1244 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1245 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1246 payload_length, conn->cid);
1247
1248 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1249 pr_err("Command ITT: 0x%08x received DataOUT after"
1250 " last DataOUT received, dumping payload\n",
1251 cmd->init_task_tag);
1252 return iscsit_dump_data_payload(conn, payload_length, 1);
1253 }
1254
1255 if (cmd->data_direction != DMA_TO_DEVICE) {
1256 pr_err("Command ITT: 0x%08x received DataOUT for a"
1257 " NON-WRITE command.\n", cmd->init_task_tag);
1258 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1259 1, 0, buf, cmd);
1260 }
1261 se_cmd = &cmd->se_cmd;
1262 iscsit_mod_dataout_timer(cmd);
1263
1264 if ((hdr->offset + payload_length) > cmd->se_cmd.data_length) {
1265 pr_err("DataOut Offset: %u, Length %u greater than"
1266 " iSCSI Command EDTL %u, protocol error.\n",
1267 hdr->offset, payload_length, cmd->se_cmd.data_length);
1268 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1269 1, 0, buf, cmd);
1270 }
1271
1272 if (cmd->unsolicited_data) {
1273 int dump_unsolicited_data = 0;
1274
1275 if (conn->sess->sess_ops->InitialR2T) {
1276 pr_err("Received unexpected unsolicited data"
1277 " while InitialR2T=Yes, protocol error.\n");
1278 transport_send_check_condition_and_sense(&cmd->se_cmd,
1279 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1280 return -1;
1281 }
1282 /*
1283 * Special case for dealing with Unsolicited DataOUT
1284 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1285 * failures;
1286 */
1287
1288 /* Something's amiss if we're not in WRITE_PENDING state... */
1289 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1290 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1291 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1292
1293 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1294 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1295 (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION))
1296 dump_unsolicited_data = 1;
1297 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1298
1299 if (dump_unsolicited_data) {
1300 /*
1301 * Check if a delayed TASK_ABORTED status needs to
1302 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1303 * received with the unsolicitied data out.
1304 */
1305 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1306 iscsit_stop_dataout_timer(cmd);
1307
1308 transport_check_aborted_status(se_cmd,
1309 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1310 return iscsit_dump_data_payload(conn, payload_length, 1);
1311 }
1312 } else {
1313 /*
1314 * For the normal solicited data path:
1315 *
1316 * Check for a delayed TASK_ABORTED status and dump any
1317 * incoming data out payload if one exists. Also, when the
1318 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1319 * data out sequence, we decrement outstanding_r2ts. Once
1320 * outstanding_r2ts reaches zero, go ahead and send the delayed
1321 * TASK_ABORTED status.
1322 */
1323 if (se_cmd->transport_state & CMD_T_ABORTED) {
1324 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1325 if (--cmd->outstanding_r2ts < 1) {
1326 iscsit_stop_dataout_timer(cmd);
1327 transport_check_aborted_status(
1328 se_cmd, 1);
1329 }
1330
1331 return iscsit_dump_data_payload(conn, payload_length, 1);
1332 }
1333 }
1334 /*
1335 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1336 * within-command recovery checks before receiving the payload.
1337 */
1338 ret = iscsit_check_pre_dataout(cmd, buf);
1339 if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1340 return 0;
1341 else if (ret == DATAOUT_CANNOT_RECOVER)
1342 return -1;
1343
1344 rx_size += payload_length;
1345 iov = &cmd->iov_data[0];
1346
1347 iov_ret = iscsit_map_iovec(cmd, iov, hdr->offset, payload_length);
1348 if (iov_ret < 0)
1349 return -1;
1350
1351 iov_count += iov_ret;
1352
1353 padding = ((-payload_length) & 3);
1354 if (padding != 0) {
1355 iov[iov_count].iov_base = cmd->pad_bytes;
1356 iov[iov_count++].iov_len = padding;
1357 rx_size += padding;
1358 pr_debug("Receiving %u padding bytes.\n", padding);
1359 }
1360
1361 if (conn->conn_ops->DataDigest) {
1362 iov[iov_count].iov_base = &checksum;
1363 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1364 rx_size += ISCSI_CRC_LEN;
1365 }
1366
1367 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1368
1369 iscsit_unmap_iovec(cmd);
1370
1371 if (rx_got != rx_size)
1372 return -1;
1373
1374 if (conn->conn_ops->DataDigest) {
1375 u32 data_crc;
1376
1377 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1378 hdr->offset, payload_length, padding,
1379 cmd->pad_bytes);
1380
1381 if (checksum != data_crc) {
1382 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1383 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1384 " does not match computed 0x%08x\n",
1385 hdr->itt, hdr->offset, payload_length,
1386 hdr->datasn, checksum, data_crc);
1387 data_crc_failed = 1;
1388 } else {
1389 pr_debug("Got CRC32C DataDigest 0x%08x for"
1390 " %u bytes of Data Out\n", checksum,
1391 payload_length);
1392 }
1393 }
1394 /*
1395 * Increment post receive data and CRC values or perform
1396 * within-command recovery.
1397 */
1398 ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1399 if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1400 return 0;
1401 else if (ret == DATAOUT_SEND_R2T) {
1402 iscsit_set_dataout_sequence_values(cmd);
1403 iscsit_build_r2ts_for_cmd(cmd, conn, false);
1404 } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1405 /*
1406 * Handle extra special case for out of order
1407 * Unsolicited Data Out.
1408 */
1409 spin_lock_bh(&cmd->istate_lock);
1410 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1411 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1412 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1413 spin_unlock_bh(&cmd->istate_lock);
1414
1415 iscsit_stop_dataout_timer(cmd);
1416 return (!ooo_cmdsn) ? transport_generic_handle_data(
1417 &cmd->se_cmd) : 0;
1418 } else /* DATAOUT_CANNOT_RECOVER */
1419 return -1;
1420
1421 return 0;
1422 }
1423
1424 static int iscsit_handle_nop_out(
1425 struct iscsi_conn *conn,
1426 unsigned char *buf)
1427 {
1428 unsigned char *ping_data = NULL;
1429 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1430 u32 checksum, data_crc, padding = 0, payload_length;
1431 struct iscsi_cmd *cmd = NULL;
1432 struct kvec *iov = NULL;
1433 struct iscsi_nopout *hdr;
1434
1435 hdr = (struct iscsi_nopout *) buf;
1436 payload_length = ntoh24(hdr->dlength);
1437 hdr->itt = be32_to_cpu(hdr->itt);
1438 hdr->ttt = be32_to_cpu(hdr->ttt);
1439 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1440 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1441
1442 if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1443 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1444 " not set, protocol error.\n");
1445 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1446 buf, conn);
1447 }
1448
1449 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1450 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1451 " greater than MaxRecvDataSegmentLength: %u, protocol"
1452 " error.\n", payload_length,
1453 conn->conn_ops->MaxRecvDataSegmentLength);
1454 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1455 buf, conn);
1456 }
1457
1458 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1459 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1460 (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
1461 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1462 payload_length);
1463 /*
1464 * This is not a response to a Unsolicited NopIN, which means
1465 * it can either be a NOPOUT ping request (with a valid ITT),
1466 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1467 * Either way, make sure we allocate an struct iscsi_cmd, as both
1468 * can contain ping data.
1469 */
1470 if (hdr->ttt == 0xFFFFFFFF) {
1471 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1472 if (!cmd)
1473 return iscsit_add_reject(
1474 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1475 1, buf, conn);
1476
1477 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1478 cmd->i_state = ISTATE_SEND_NOPIN;
1479 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1480 1 : 0);
1481 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1482 cmd->targ_xfer_tag = 0xFFFFFFFF;
1483 cmd->cmd_sn = hdr->cmdsn;
1484 cmd->exp_stat_sn = hdr->exp_statsn;
1485 cmd->data_direction = DMA_NONE;
1486 }
1487
1488 if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
1489 rx_size = payload_length;
1490 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1491 if (!ping_data) {
1492 pr_err("Unable to allocate memory for"
1493 " NOPOUT ping data.\n");
1494 ret = -1;
1495 goto out;
1496 }
1497
1498 iov = &cmd->iov_misc[0];
1499 iov[niov].iov_base = ping_data;
1500 iov[niov++].iov_len = payload_length;
1501
1502 padding = ((-payload_length) & 3);
1503 if (padding != 0) {
1504 pr_debug("Receiving %u additional bytes"
1505 " for padding.\n", padding);
1506 iov[niov].iov_base = &cmd->pad_bytes;
1507 iov[niov++].iov_len = padding;
1508 rx_size += padding;
1509 }
1510 if (conn->conn_ops->DataDigest) {
1511 iov[niov].iov_base = &checksum;
1512 iov[niov++].iov_len = ISCSI_CRC_LEN;
1513 rx_size += ISCSI_CRC_LEN;
1514 }
1515
1516 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1517 if (rx_got != rx_size) {
1518 ret = -1;
1519 goto out;
1520 }
1521
1522 if (conn->conn_ops->DataDigest) {
1523 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1524 ping_data, payload_length,
1525 padding, cmd->pad_bytes,
1526 (u8 *)&data_crc);
1527
1528 if (checksum != data_crc) {
1529 pr_err("Ping data CRC32C DataDigest"
1530 " 0x%08x does not match computed 0x%08x\n",
1531 checksum, data_crc);
1532 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1533 pr_err("Unable to recover from"
1534 " NOPOUT Ping DataCRC failure while in"
1535 " ERL=0.\n");
1536 ret = -1;
1537 goto out;
1538 } else {
1539 /*
1540 * Silently drop this PDU and let the
1541 * initiator plug the CmdSN gap.
1542 */
1543 pr_debug("Dropping NOPOUT"
1544 " Command CmdSN: 0x%08x due to"
1545 " DataCRC error.\n", hdr->cmdsn);
1546 ret = 0;
1547 goto out;
1548 }
1549 } else {
1550 pr_debug("Got CRC32C DataDigest"
1551 " 0x%08x for %u bytes of ping data.\n",
1552 checksum, payload_length);
1553 }
1554 }
1555
1556 ping_data[payload_length] = '\0';
1557 /*
1558 * Attach ping data to struct iscsi_cmd->buf_ptr.
1559 */
1560 cmd->buf_ptr = ping_data;
1561 cmd->buf_ptr_size = payload_length;
1562
1563 pr_debug("Got %u bytes of NOPOUT ping"
1564 " data.\n", payload_length);
1565 pr_debug("Ping Data: \"%s\"\n", ping_data);
1566 }
1567
1568 if (hdr->itt != 0xFFFFFFFF) {
1569 if (!cmd) {
1570 pr_err("Checking CmdSN for NOPOUT,"
1571 " but cmd is NULL!\n");
1572 return -1;
1573 }
1574 /*
1575 * Initiator is expecting a NopIN ping reply,
1576 */
1577 spin_lock_bh(&conn->cmd_lock);
1578 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1579 spin_unlock_bh(&conn->cmd_lock);
1580
1581 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1582
1583 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1584 iscsit_add_cmd_to_response_queue(cmd, conn,
1585 cmd->i_state);
1586 return 0;
1587 }
1588
1589 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1590 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1591 ret = 0;
1592 goto ping_out;
1593 }
1594 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1595 return iscsit_add_reject_from_cmd(
1596 ISCSI_REASON_PROTOCOL_ERROR,
1597 1, 0, buf, cmd);
1598
1599 return 0;
1600 }
1601
1602 if (hdr->ttt != 0xFFFFFFFF) {
1603 /*
1604 * This was a response to a unsolicited NOPIN ping.
1605 */
1606 cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
1607 if (!cmd)
1608 return -1;
1609
1610 iscsit_stop_nopin_response_timer(conn);
1611
1612 cmd->i_state = ISTATE_REMOVE;
1613 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1614 iscsit_start_nopin_timer(conn);
1615 } else {
1616 /*
1617 * Initiator is not expecting a NOPIN is response.
1618 * Just ignore for now.
1619 *
1620 * iSCSI v19-91 10.18
1621 * "A NOP-OUT may also be used to confirm a changed
1622 * ExpStatSN if another PDU will not be available
1623 * for a long time."
1624 */
1625 ret = 0;
1626 goto out;
1627 }
1628
1629 return 0;
1630 out:
1631 if (cmd)
1632 iscsit_release_cmd(cmd);
1633 ping_out:
1634 kfree(ping_data);
1635 return ret;
1636 }
1637
1638 static int iscsit_handle_task_mgt_cmd(
1639 struct iscsi_conn *conn,
1640 unsigned char *buf)
1641 {
1642 struct iscsi_cmd *cmd;
1643 struct se_tmr_req *se_tmr;
1644 struct iscsi_tmr_req *tmr_req;
1645 struct iscsi_tm *hdr;
1646 int out_of_order_cmdsn = 0;
1647 int ret;
1648 u8 function;
1649
1650 hdr = (struct iscsi_tm *) buf;
1651 hdr->itt = be32_to_cpu(hdr->itt);
1652 hdr->rtt = be32_to_cpu(hdr->rtt);
1653 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1654 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1655 hdr->refcmdsn = be32_to_cpu(hdr->refcmdsn);
1656 hdr->exp_datasn = be32_to_cpu(hdr->exp_datasn);
1657 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1658 function = hdr->flags;
1659
1660 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1661 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1662 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1663 hdr->rtt, hdr->refcmdsn, conn->cid);
1664
1665 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1666 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1667 (hdr->rtt != ISCSI_RESERVED_TAG))) {
1668 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1669 hdr->rtt = ISCSI_RESERVED_TAG;
1670 }
1671
1672 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1673 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1674 pr_err("Task Management Request TASK_REASSIGN not"
1675 " issued as immediate command, bad iSCSI Initiator"
1676 "implementation\n");
1677 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1678 buf, conn);
1679 }
1680 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1681 (hdr->refcmdsn != ISCSI_RESERVED_TAG))
1682 hdr->refcmdsn = ISCSI_RESERVED_TAG;
1683
1684 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1685 if (!cmd)
1686 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1687 1, buf, conn);
1688
1689 cmd->data_direction = DMA_NONE;
1690
1691 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1692 if (!cmd->tmr_req) {
1693 pr_err("Unable to allocate memory for"
1694 " Task Management command!\n");
1695 return iscsit_add_reject_from_cmd(
1696 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1697 1, 1, buf, cmd);
1698 }
1699
1700 /*
1701 * TASK_REASSIGN for ERL=2 / connection stays inside of
1702 * LIO-Target $FABRIC_MOD
1703 */
1704 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1705
1706 u8 tcm_function;
1707 int ret;
1708
1709 transport_init_se_cmd(&cmd->se_cmd,
1710 &lio_target_fabric_configfs->tf_ops,
1711 conn->sess->se_sess, 0, DMA_NONE,
1712 MSG_SIMPLE_TAG, &cmd->sense_buffer[0]);
1713
1714 switch (function) {
1715 case ISCSI_TM_FUNC_ABORT_TASK:
1716 tcm_function = TMR_ABORT_TASK;
1717 break;
1718 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1719 tcm_function = TMR_ABORT_TASK_SET;
1720 break;
1721 case ISCSI_TM_FUNC_CLEAR_ACA:
1722 tcm_function = TMR_CLEAR_ACA;
1723 break;
1724 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1725 tcm_function = TMR_CLEAR_TASK_SET;
1726 break;
1727 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1728 tcm_function = TMR_LUN_RESET;
1729 break;
1730 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1731 tcm_function = TMR_TARGET_WARM_RESET;
1732 break;
1733 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1734 tcm_function = TMR_TARGET_COLD_RESET;
1735 break;
1736 default:
1737 pr_err("Unknown iSCSI TMR Function:"
1738 " 0x%02x\n", function);
1739 return iscsit_add_reject_from_cmd(
1740 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1741 1, 1, buf, cmd);
1742 }
1743
1744 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1745 tcm_function, GFP_KERNEL);
1746 if (ret < 0)
1747 return iscsit_add_reject_from_cmd(
1748 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1749 1, 1, buf, cmd);
1750
1751 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1752 }
1753
1754 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1755 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1756 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1757 cmd->init_task_tag = hdr->itt;
1758 cmd->targ_xfer_tag = 0xFFFFFFFF;
1759 cmd->cmd_sn = hdr->cmdsn;
1760 cmd->exp_stat_sn = hdr->exp_statsn;
1761 se_tmr = cmd->se_cmd.se_tmr_req;
1762 tmr_req = cmd->tmr_req;
1763 /*
1764 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1765 */
1766 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1767 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1768 scsilun_to_int(&hdr->lun));
1769 if (ret < 0) {
1770 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1771 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1772 goto attach;
1773 }
1774 }
1775
1776 switch (function) {
1777 case ISCSI_TM_FUNC_ABORT_TASK:
1778 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1779 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1780 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1781 goto attach;
1782 }
1783 break;
1784 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1785 case ISCSI_TM_FUNC_CLEAR_ACA:
1786 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1787 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1788 break;
1789 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1790 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1791 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1792 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1793 goto attach;
1794 }
1795 break;
1796 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1797 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1798 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1799 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1800 goto attach;
1801 }
1802 break;
1803 case ISCSI_TM_FUNC_TASK_REASSIGN:
1804 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1805 /*
1806 * Perform sanity checks on the ExpDataSN only if the
1807 * TASK_REASSIGN was successful.
1808 */
1809 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1810 break;
1811
1812 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1813 return iscsit_add_reject_from_cmd(
1814 ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1815 buf, cmd);
1816 break;
1817 default:
1818 pr_err("Unknown TMR function: 0x%02x, protocol"
1819 " error.\n", function);
1820 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1821 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1822 goto attach;
1823 }
1824
1825 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1826 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1827 se_tmr->call_transport = 1;
1828 attach:
1829 spin_lock_bh(&conn->cmd_lock);
1830 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1831 spin_unlock_bh(&conn->cmd_lock);
1832
1833 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1834 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1835 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1836 out_of_order_cmdsn = 1;
1837 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1838 return 0;
1839 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1840 return iscsit_add_reject_from_cmd(
1841 ISCSI_REASON_PROTOCOL_ERROR,
1842 1, 0, buf, cmd);
1843 }
1844 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1845
1846 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1847 return 0;
1848 /*
1849 * Found the referenced task, send to transport for processing.
1850 */
1851 if (se_tmr->call_transport)
1852 return transport_generic_handle_tmr(&cmd->se_cmd);
1853
1854 /*
1855 * Could not find the referenced LUN, task, or Task Management
1856 * command not authorized or supported. Change state and
1857 * let the tx_thread send the response.
1858 *
1859 * For connection recovery, this is also the default action for
1860 * TMR TASK_REASSIGN.
1861 */
1862 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1863 return 0;
1864 }
1865
1866 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1867 static int iscsit_handle_text_cmd(
1868 struct iscsi_conn *conn,
1869 unsigned char *buf)
1870 {
1871 char *text_ptr, *text_in;
1872 int cmdsn_ret, niov = 0, rx_got, rx_size;
1873 u32 checksum = 0, data_crc = 0, payload_length;
1874 u32 padding = 0, pad_bytes = 0, text_length = 0;
1875 struct iscsi_cmd *cmd;
1876 struct kvec iov[3];
1877 struct iscsi_text *hdr;
1878
1879 hdr = (struct iscsi_text *) buf;
1880 payload_length = ntoh24(hdr->dlength);
1881 hdr->itt = be32_to_cpu(hdr->itt);
1882 hdr->ttt = be32_to_cpu(hdr->ttt);
1883 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1884 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1885
1886 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1887 pr_err("Unable to accept text parameter length: %u"
1888 "greater than MaxRecvDataSegmentLength %u.\n",
1889 payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
1890 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1891 buf, conn);
1892 }
1893
1894 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1895 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1896 hdr->exp_statsn, payload_length);
1897
1898 rx_size = text_length = payload_length;
1899 if (text_length) {
1900 text_in = kzalloc(text_length, GFP_KERNEL);
1901 if (!text_in) {
1902 pr_err("Unable to allocate memory for"
1903 " incoming text parameters\n");
1904 return -1;
1905 }
1906
1907 memset(iov, 0, 3 * sizeof(struct kvec));
1908 iov[niov].iov_base = text_in;
1909 iov[niov++].iov_len = text_length;
1910
1911 padding = ((-payload_length) & 3);
1912 if (padding != 0) {
1913 iov[niov].iov_base = &pad_bytes;
1914 iov[niov++].iov_len = padding;
1915 rx_size += padding;
1916 pr_debug("Receiving %u additional bytes"
1917 " for padding.\n", padding);
1918 }
1919 if (conn->conn_ops->DataDigest) {
1920 iov[niov].iov_base = &checksum;
1921 iov[niov++].iov_len = ISCSI_CRC_LEN;
1922 rx_size += ISCSI_CRC_LEN;
1923 }
1924
1925 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1926 if (rx_got != rx_size) {
1927 kfree(text_in);
1928 return -1;
1929 }
1930
1931 if (conn->conn_ops->DataDigest) {
1932 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1933 text_in, text_length,
1934 padding, (u8 *)&pad_bytes,
1935 (u8 *)&data_crc);
1936
1937 if (checksum != data_crc) {
1938 pr_err("Text data CRC32C DataDigest"
1939 " 0x%08x does not match computed"
1940 " 0x%08x\n", checksum, data_crc);
1941 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1942 pr_err("Unable to recover from"
1943 " Text Data digest failure while in"
1944 " ERL=0.\n");
1945 kfree(text_in);
1946 return -1;
1947 } else {
1948 /*
1949 * Silently drop this PDU and let the
1950 * initiator plug the CmdSN gap.
1951 */
1952 pr_debug("Dropping Text"
1953 " Command CmdSN: 0x%08x due to"
1954 " DataCRC error.\n", hdr->cmdsn);
1955 kfree(text_in);
1956 return 0;
1957 }
1958 } else {
1959 pr_debug("Got CRC32C DataDigest"
1960 " 0x%08x for %u bytes of text data.\n",
1961 checksum, text_length);
1962 }
1963 }
1964 text_in[text_length - 1] = '\0';
1965 pr_debug("Successfully read %d bytes of text"
1966 " data.\n", text_length);
1967
1968 if (strncmp("SendTargets", text_in, 11) != 0) {
1969 pr_err("Received Text Data that is not"
1970 " SendTargets, cannot continue.\n");
1971 kfree(text_in);
1972 return -1;
1973 }
1974 text_ptr = strchr(text_in, '=');
1975 if (!text_ptr) {
1976 pr_err("No \"=\" separator found in Text Data,"
1977 " cannot continue.\n");
1978 kfree(text_in);
1979 return -1;
1980 }
1981 if (strncmp("=All", text_ptr, 4) != 0) {
1982 pr_err("Unable to locate All value for"
1983 " SendTargets key, cannot continue.\n");
1984 kfree(text_in);
1985 return -1;
1986 }
1987 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1988 kfree(text_in);
1989 }
1990
1991 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1992 if (!cmd)
1993 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1994 1, buf, conn);
1995
1996 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1997 cmd->i_state = ISTATE_SEND_TEXTRSP;
1998 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1999 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2000 cmd->targ_xfer_tag = 0xFFFFFFFF;
2001 cmd->cmd_sn = hdr->cmdsn;
2002 cmd->exp_stat_sn = hdr->exp_statsn;
2003 cmd->data_direction = DMA_NONE;
2004
2005 spin_lock_bh(&conn->cmd_lock);
2006 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2007 spin_unlock_bh(&conn->cmd_lock);
2008
2009 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2010
2011 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2012 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2013 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2014 return iscsit_add_reject_from_cmd(
2015 ISCSI_REASON_PROTOCOL_ERROR,
2016 1, 0, buf, cmd);
2017
2018 return 0;
2019 }
2020
2021 return iscsit_execute_cmd(cmd, 0);
2022 }
2023
2024 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2025 {
2026 struct iscsi_conn *conn_p;
2027 struct iscsi_session *sess = conn->sess;
2028
2029 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2030 " for SID: %u.\n", conn->cid, conn->sess->sid);
2031
2032 atomic_set(&sess->session_logout, 1);
2033 atomic_set(&conn->conn_logout_remove, 1);
2034 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2035
2036 iscsit_inc_conn_usage_count(conn);
2037 iscsit_inc_session_usage_count(sess);
2038
2039 spin_lock_bh(&sess->conn_lock);
2040 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2041 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2042 continue;
2043
2044 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2045 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2046 }
2047 spin_unlock_bh(&sess->conn_lock);
2048
2049 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2050
2051 return 0;
2052 }
2053
2054 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2055 {
2056 struct iscsi_conn *l_conn;
2057 struct iscsi_session *sess = conn->sess;
2058
2059 pr_debug("Received logout request CLOSECONNECTION for CID:"
2060 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2061
2062 /*
2063 * A Logout Request with a CLOSECONNECTION reason code for a CID
2064 * can arrive on a connection with a differing CID.
2065 */
2066 if (conn->cid == cmd->logout_cid) {
2067 spin_lock_bh(&conn->state_lock);
2068 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2069 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2070
2071 atomic_set(&conn->conn_logout_remove, 1);
2072 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2073 iscsit_inc_conn_usage_count(conn);
2074
2075 spin_unlock_bh(&conn->state_lock);
2076 } else {
2077 /*
2078 * Handle all different cid CLOSECONNECTION requests in
2079 * iscsit_logout_post_handler_diffcid() as to give enough
2080 * time for any non immediate command's CmdSN to be
2081 * acknowledged on the connection in question.
2082 *
2083 * Here we simply make sure the CID is still around.
2084 */
2085 l_conn = iscsit_get_conn_from_cid(sess,
2086 cmd->logout_cid);
2087 if (!l_conn) {
2088 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2089 iscsit_add_cmd_to_response_queue(cmd, conn,
2090 cmd->i_state);
2091 return 0;
2092 }
2093
2094 iscsit_dec_conn_usage_count(l_conn);
2095 }
2096
2097 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2098
2099 return 0;
2100 }
2101
2102 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2103 {
2104 struct iscsi_session *sess = conn->sess;
2105
2106 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2107 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2108
2109 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2110 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2111 " while ERL!=2.\n");
2112 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2113 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2114 return 0;
2115 }
2116
2117 if (conn->cid == cmd->logout_cid) {
2118 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2119 " with CID: %hu on CID: %hu, implementation error.\n",
2120 cmd->logout_cid, conn->cid);
2121 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2122 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2123 return 0;
2124 }
2125
2126 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2127
2128 return 0;
2129 }
2130
2131 static int iscsit_handle_logout_cmd(
2132 struct iscsi_conn *conn,
2133 unsigned char *buf)
2134 {
2135 int cmdsn_ret, logout_remove = 0;
2136 u8 reason_code = 0;
2137 struct iscsi_cmd *cmd;
2138 struct iscsi_logout *hdr;
2139 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2140
2141 hdr = (struct iscsi_logout *) buf;
2142 reason_code = (hdr->flags & 0x7f);
2143 hdr->itt = be32_to_cpu(hdr->itt);
2144 hdr->cid = be16_to_cpu(hdr->cid);
2145 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
2146 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2147
2148 if (tiqn) {
2149 spin_lock(&tiqn->logout_stats.lock);
2150 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2151 tiqn->logout_stats.normal_logouts++;
2152 else
2153 tiqn->logout_stats.abnormal_logouts++;
2154 spin_unlock(&tiqn->logout_stats.lock);
2155 }
2156
2157 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2158 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2159 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2160 hdr->cid, conn->cid);
2161
2162 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2163 pr_err("Received logout request on connection that"
2164 " is not in logged in state, ignoring request.\n");
2165 return 0;
2166 }
2167
2168 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2169 if (!cmd)
2170 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2171 buf, conn);
2172
2173 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2174 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2175 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2176 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2177 cmd->targ_xfer_tag = 0xFFFFFFFF;
2178 cmd->cmd_sn = hdr->cmdsn;
2179 cmd->exp_stat_sn = hdr->exp_statsn;
2180 cmd->logout_cid = hdr->cid;
2181 cmd->logout_reason = reason_code;
2182 cmd->data_direction = DMA_NONE;
2183
2184 /*
2185 * We need to sleep in these cases (by returning 1) until the Logout
2186 * Response gets sent in the tx thread.
2187 */
2188 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2189 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2190 (hdr->cid == conn->cid)))
2191 logout_remove = 1;
2192
2193 spin_lock_bh(&conn->cmd_lock);
2194 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2195 spin_unlock_bh(&conn->cmd_lock);
2196
2197 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2198 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2199
2200 /*
2201 * Immediate commands are executed, well, immediately.
2202 * Non-Immediate Logout Commands are executed in CmdSN order.
2203 */
2204 if (cmd->immediate_cmd) {
2205 int ret = iscsit_execute_cmd(cmd, 0);
2206
2207 if (ret < 0)
2208 return ret;
2209 } else {
2210 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2211 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2212 logout_remove = 0;
2213 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2214 return iscsit_add_reject_from_cmd(
2215 ISCSI_REASON_PROTOCOL_ERROR,
2216 1, 0, buf, cmd);
2217 }
2218 }
2219
2220 return logout_remove;
2221 }
2222
2223 static int iscsit_handle_snack(
2224 struct iscsi_conn *conn,
2225 unsigned char *buf)
2226 {
2227 struct iscsi_snack *hdr;
2228
2229 hdr = (struct iscsi_snack *) buf;
2230 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2231 hdr->itt = be32_to_cpu(hdr->itt);
2232 hdr->ttt = be32_to_cpu(hdr->ttt);
2233 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2234 hdr->begrun = be32_to_cpu(hdr->begrun);
2235 hdr->runlength = be32_to_cpu(hdr->runlength);
2236
2237 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2238 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2239 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2240 hdr->begrun, hdr->runlength, conn->cid);
2241
2242 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2243 pr_err("Initiator sent SNACK request while in"
2244 " ErrorRecoveryLevel=0.\n");
2245 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2246 buf, conn);
2247 }
2248 /*
2249 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2250 * call from inside iscsi_send_recovery_datain_or_r2t().
2251 */
2252 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2253 case 0:
2254 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2255 hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
2256 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2257 return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
2258 hdr->begrun, hdr->runlength);
2259 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2260 return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
2261 hdr->runlength);
2262 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2263 /* FIXME: Support R-Data SNACK */
2264 pr_err("R-Data SNACK Not Supported.\n");
2265 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2266 buf, conn);
2267 default:
2268 pr_err("Unknown SNACK type 0x%02x, protocol"
2269 " error.\n", hdr->flags & 0x0f);
2270 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2271 buf, conn);
2272 }
2273
2274 return 0;
2275 }
2276
2277 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2278 {
2279 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2280 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2281 wait_for_completion_interruptible_timeout(
2282 &conn->rx_half_close_comp,
2283 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2284 }
2285 }
2286
2287 static int iscsit_handle_immediate_data(
2288 struct iscsi_cmd *cmd,
2289 unsigned char *buf,
2290 u32 length)
2291 {
2292 int iov_ret, rx_got = 0, rx_size = 0;
2293 u32 checksum, iov_count = 0, padding = 0;
2294 struct iscsi_conn *conn = cmd->conn;
2295 struct kvec *iov;
2296
2297 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2298 if (iov_ret < 0)
2299 return IMMEDIATE_DATA_CANNOT_RECOVER;
2300
2301 rx_size = length;
2302 iov_count = iov_ret;
2303 iov = &cmd->iov_data[0];
2304
2305 padding = ((-length) & 3);
2306 if (padding != 0) {
2307 iov[iov_count].iov_base = cmd->pad_bytes;
2308 iov[iov_count++].iov_len = padding;
2309 rx_size += padding;
2310 }
2311
2312 if (conn->conn_ops->DataDigest) {
2313 iov[iov_count].iov_base = &checksum;
2314 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2315 rx_size += ISCSI_CRC_LEN;
2316 }
2317
2318 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2319
2320 iscsit_unmap_iovec(cmd);
2321
2322 if (rx_got != rx_size) {
2323 iscsit_rx_thread_wait_for_tcp(conn);
2324 return IMMEDIATE_DATA_CANNOT_RECOVER;
2325 }
2326
2327 if (conn->conn_ops->DataDigest) {
2328 u32 data_crc;
2329
2330 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2331 cmd->write_data_done, length, padding,
2332 cmd->pad_bytes);
2333
2334 if (checksum != data_crc) {
2335 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2336 " does not match computed 0x%08x\n", checksum,
2337 data_crc);
2338
2339 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2340 pr_err("Unable to recover from"
2341 " Immediate Data digest failure while"
2342 " in ERL=0.\n");
2343 iscsit_add_reject_from_cmd(
2344 ISCSI_REASON_DATA_DIGEST_ERROR,
2345 1, 0, buf, cmd);
2346 return IMMEDIATE_DATA_CANNOT_RECOVER;
2347 } else {
2348 iscsit_add_reject_from_cmd(
2349 ISCSI_REASON_DATA_DIGEST_ERROR,
2350 0, 0, buf, cmd);
2351 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2352 }
2353 } else {
2354 pr_debug("Got CRC32C DataDigest 0x%08x for"
2355 " %u bytes of Immediate Data\n", checksum,
2356 length);
2357 }
2358 }
2359
2360 cmd->write_data_done += length;
2361
2362 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2363 spin_lock_bh(&cmd->istate_lock);
2364 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2365 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2366 spin_unlock_bh(&cmd->istate_lock);
2367 }
2368
2369 return IMMEDIATE_DATA_NORMAL_OPERATION;
2370 }
2371
2372 /*
2373 * Called with sess->conn_lock held.
2374 */
2375 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2376 with active network interface */
2377 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2378 {
2379 struct iscsi_cmd *cmd;
2380 struct iscsi_conn *conn_p;
2381
2382 /*
2383 * Only send a Asynchronous Message on connections whos network
2384 * interface is still functional.
2385 */
2386 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2387 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2388 iscsit_inc_conn_usage_count(conn_p);
2389 break;
2390 }
2391 }
2392
2393 if (!conn_p)
2394 return;
2395
2396 cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
2397 if (!cmd) {
2398 iscsit_dec_conn_usage_count(conn_p);
2399 return;
2400 }
2401
2402 cmd->logout_cid = conn->cid;
2403 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2404 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2405
2406 spin_lock_bh(&conn_p->cmd_lock);
2407 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2408 spin_unlock_bh(&conn_p->cmd_lock);
2409
2410 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2411 iscsit_dec_conn_usage_count(conn_p);
2412 }
2413
2414 static int iscsit_send_conn_drop_async_message(
2415 struct iscsi_cmd *cmd,
2416 struct iscsi_conn *conn)
2417 {
2418 struct iscsi_async *hdr;
2419
2420 cmd->tx_size = ISCSI_HDR_LEN;
2421 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2422
2423 hdr = (struct iscsi_async *) cmd->pdu;
2424 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2425 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2426 cmd->init_task_tag = 0xFFFFFFFF;
2427 cmd->targ_xfer_tag = 0xFFFFFFFF;
2428 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2429 cmd->stat_sn = conn->stat_sn++;
2430 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2431 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2432 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2433 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2434 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2435 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2436 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2437
2438 if (conn->conn_ops->HeaderDigest) {
2439 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2440
2441 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2442 (unsigned char *)hdr, ISCSI_HDR_LEN,
2443 0, NULL, (u8 *)header_digest);
2444
2445 cmd->tx_size += ISCSI_CRC_LEN;
2446 pr_debug("Attaching CRC32C HeaderDigest to"
2447 " Async Message 0x%08x\n", *header_digest);
2448 }
2449
2450 cmd->iov_misc[0].iov_base = cmd->pdu;
2451 cmd->iov_misc[0].iov_len = cmd->tx_size;
2452 cmd->iov_misc_count = 1;
2453
2454 pr_debug("Sending Connection Dropped Async Message StatSN:"
2455 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2456 cmd->logout_cid, conn->cid);
2457 return 0;
2458 }
2459
2460 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2461 {
2462 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2463 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2464 wait_for_completion_interruptible_timeout(
2465 &conn->tx_half_close_comp,
2466 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2467 }
2468 }
2469
2470 static int iscsit_send_data_in(
2471 struct iscsi_cmd *cmd,
2472 struct iscsi_conn *conn)
2473 {
2474 int iov_ret = 0, set_statsn = 0;
2475 u32 iov_count = 0, tx_size = 0;
2476 struct iscsi_datain datain;
2477 struct iscsi_datain_req *dr;
2478 struct iscsi_data_rsp *hdr;
2479 struct kvec *iov;
2480 int eodr = 0;
2481 int ret;
2482
2483 memset(&datain, 0, sizeof(struct iscsi_datain));
2484 dr = iscsit_get_datain_values(cmd, &datain);
2485 if (!dr) {
2486 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2487 cmd->init_task_tag);
2488 return -1;
2489 }
2490
2491 /*
2492 * Be paranoid and double check the logic for now.
2493 */
2494 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2495 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2496 " datain.length: %u exceeds cmd->data_length: %u\n",
2497 cmd->init_task_tag, datain.offset, datain.length,
2498 cmd->se_cmd.data_length);
2499 return -1;
2500 }
2501
2502 spin_lock_bh(&conn->sess->session_stats_lock);
2503 conn->sess->tx_data_octets += datain.length;
2504 if (conn->sess->se_sess->se_node_acl) {
2505 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2506 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2507 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2508 }
2509 spin_unlock_bh(&conn->sess->session_stats_lock);
2510 /*
2511 * Special case for successfully execution w/ both DATAIN
2512 * and Sense Data.
2513 */
2514 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2515 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2516 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2517 else {
2518 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2519 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2520 iscsit_increment_maxcmdsn(cmd, conn->sess);
2521 cmd->stat_sn = conn->stat_sn++;
2522 set_statsn = 1;
2523 } else if (dr->dr_complete ==
2524 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2525 set_statsn = 1;
2526 }
2527
2528 hdr = (struct iscsi_data_rsp *) cmd->pdu;
2529 memset(hdr, 0, ISCSI_HDR_LEN);
2530 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2531 hdr->flags = datain.flags;
2532 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2533 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2534 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2535 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2536 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2537 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2538 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2539 }
2540 }
2541 hton24(hdr->dlength, datain.length);
2542 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2543 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2544 (struct scsi_lun *)&hdr->lun);
2545 else
2546 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2547
2548 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2549 hdr->ttt = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
2550 cpu_to_be32(cmd->targ_xfer_tag) :
2551 0xFFFFFFFF;
2552 hdr->statsn = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
2553 0xFFFFFFFF;
2554 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2555 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2556 hdr->datasn = cpu_to_be32(datain.data_sn);
2557 hdr->offset = cpu_to_be32(datain.offset);
2558
2559 iov = &cmd->iov_data[0];
2560 iov[iov_count].iov_base = cmd->pdu;
2561 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2562 tx_size += ISCSI_HDR_LEN;
2563
2564 if (conn->conn_ops->HeaderDigest) {
2565 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2566
2567 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2568 (unsigned char *)hdr, ISCSI_HDR_LEN,
2569 0, NULL, (u8 *)header_digest);
2570
2571 iov[0].iov_len += ISCSI_CRC_LEN;
2572 tx_size += ISCSI_CRC_LEN;
2573
2574 pr_debug("Attaching CRC32 HeaderDigest"
2575 " for DataIN PDU 0x%08x\n", *header_digest);
2576 }
2577
2578 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2579 if (iov_ret < 0)
2580 return -1;
2581
2582 iov_count += iov_ret;
2583 tx_size += datain.length;
2584
2585 cmd->padding = ((-datain.length) & 3);
2586 if (cmd->padding) {
2587 iov[iov_count].iov_base = cmd->pad_bytes;
2588 iov[iov_count++].iov_len = cmd->padding;
2589 tx_size += cmd->padding;
2590
2591 pr_debug("Attaching %u padding bytes\n",
2592 cmd->padding);
2593 }
2594 if (conn->conn_ops->DataDigest) {
2595 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2596 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2597
2598 iov[iov_count].iov_base = &cmd->data_crc;
2599 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2600 tx_size += ISCSI_CRC_LEN;
2601
2602 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2603 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2604 }
2605
2606 cmd->iov_data_count = iov_count;
2607 cmd->tx_size = tx_size;
2608
2609 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2610 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2611 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2612 ntohl(hdr->offset), datain.length, conn->cid);
2613
2614 /* sendpage is preferred but can't insert markers */
2615 if (!conn->conn_ops->IFMarker)
2616 ret = iscsit_fe_sendpage_sg(cmd, conn);
2617 else
2618 ret = iscsit_send_tx_data(cmd, conn, 0);
2619
2620 iscsit_unmap_iovec(cmd);
2621
2622 if (ret < 0) {
2623 iscsit_tx_thread_wait_for_tcp(conn);
2624 return ret;
2625 }
2626
2627 if (dr->dr_complete) {
2628 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2629 2 : 1;
2630 iscsit_free_datain_req(cmd, dr);
2631 }
2632
2633 return eodr;
2634 }
2635
2636 static int iscsit_send_logout_response(
2637 struct iscsi_cmd *cmd,
2638 struct iscsi_conn *conn)
2639 {
2640 int niov = 0, tx_size;
2641 struct iscsi_conn *logout_conn = NULL;
2642 struct iscsi_conn_recovery *cr = NULL;
2643 struct iscsi_session *sess = conn->sess;
2644 struct kvec *iov;
2645 struct iscsi_logout_rsp *hdr;
2646 /*
2647 * The actual shutting down of Sessions and/or Connections
2648 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2649 * is done in scsi_logout_post_handler().
2650 */
2651 switch (cmd->logout_reason) {
2652 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2653 pr_debug("iSCSI session logout successful, setting"
2654 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2655 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2656 break;
2657 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2658 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2659 break;
2660 /*
2661 * For CLOSECONNECTION logout requests carrying
2662 * a matching logout CID -> local CID, the reference
2663 * for the local CID will have been incremented in
2664 * iscsi_logout_closeconnection().
2665 *
2666 * For CLOSECONNECTION logout requests carrying
2667 * a different CID than the connection it arrived
2668 * on, the connection responding to cmd->logout_cid
2669 * is stopped in iscsit_logout_post_handler_diffcid().
2670 */
2671
2672 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2673 " successful.\n", cmd->logout_cid, conn->cid);
2674 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2675 break;
2676 case ISCSI_LOGOUT_REASON_RECOVERY:
2677 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2678 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2679 break;
2680 /*
2681 * If the connection is still active from our point of view
2682 * force connection recovery to occur.
2683 */
2684 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2685 cmd->logout_cid);
2686 if ((logout_conn)) {
2687 iscsit_connection_reinstatement_rcfr(logout_conn);
2688 iscsit_dec_conn_usage_count(logout_conn);
2689 }
2690
2691 cr = iscsit_get_inactive_connection_recovery_entry(
2692 conn->sess, cmd->logout_cid);
2693 if (!cr) {
2694 pr_err("Unable to locate CID: %hu for"
2695 " REMOVECONNFORRECOVERY Logout Request.\n",
2696 cmd->logout_cid);
2697 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2698 break;
2699 }
2700
2701 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2702
2703 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2704 " for recovery for CID: %hu on CID: %hu successful.\n",
2705 cmd->logout_cid, conn->cid);
2706 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2707 break;
2708 default:
2709 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2710 cmd->logout_reason);
2711 return -1;
2712 }
2713
2714 tx_size = ISCSI_HDR_LEN;
2715 hdr = (struct iscsi_logout_rsp *)cmd->pdu;
2716 memset(hdr, 0, ISCSI_HDR_LEN);
2717 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2718 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2719 hdr->response = cmd->logout_response;
2720 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2721 cmd->stat_sn = conn->stat_sn++;
2722 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2723
2724 iscsit_increment_maxcmdsn(cmd, conn->sess);
2725 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2726 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2727
2728 iov = &cmd->iov_misc[0];
2729 iov[niov].iov_base = cmd->pdu;
2730 iov[niov++].iov_len = ISCSI_HDR_LEN;
2731
2732 if (conn->conn_ops->HeaderDigest) {
2733 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2734
2735 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2736 (unsigned char *)hdr, ISCSI_HDR_LEN,
2737 0, NULL, (u8 *)header_digest);
2738
2739 iov[0].iov_len += ISCSI_CRC_LEN;
2740 tx_size += ISCSI_CRC_LEN;
2741 pr_debug("Attaching CRC32C HeaderDigest to"
2742 " Logout Response 0x%08x\n", *header_digest);
2743 }
2744 cmd->iov_misc_count = niov;
2745 cmd->tx_size = tx_size;
2746
2747 pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2748 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2749 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2750 cmd->logout_cid, conn->cid);
2751
2752 return 0;
2753 }
2754
2755 /*
2756 * Unsolicited NOPIN, either requesting a response or not.
2757 */
2758 static int iscsit_send_unsolicited_nopin(
2759 struct iscsi_cmd *cmd,
2760 struct iscsi_conn *conn,
2761 int want_response)
2762 {
2763 int tx_size = ISCSI_HDR_LEN;
2764 struct iscsi_nopin *hdr;
2765 int ret;
2766
2767 hdr = (struct iscsi_nopin *) cmd->pdu;
2768 memset(hdr, 0, ISCSI_HDR_LEN);
2769 hdr->opcode = ISCSI_OP_NOOP_IN;
2770 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2771 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2772 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2773 cmd->stat_sn = conn->stat_sn;
2774 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2775 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2776 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2777
2778 if (conn->conn_ops->HeaderDigest) {
2779 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2780
2781 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2782 (unsigned char *)hdr, ISCSI_HDR_LEN,
2783 0, NULL, (u8 *)header_digest);
2784
2785 tx_size += ISCSI_CRC_LEN;
2786 pr_debug("Attaching CRC32C HeaderDigest to"
2787 " NopIN 0x%08x\n", *header_digest);
2788 }
2789
2790 cmd->iov_misc[0].iov_base = cmd->pdu;
2791 cmd->iov_misc[0].iov_len = tx_size;
2792 cmd->iov_misc_count = 1;
2793 cmd->tx_size = tx_size;
2794
2795 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2796 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2797
2798 ret = iscsit_send_tx_data(cmd, conn, 1);
2799 if (ret < 0) {
2800 iscsit_tx_thread_wait_for_tcp(conn);
2801 return ret;
2802 }
2803
2804 spin_lock_bh(&cmd->istate_lock);
2805 cmd->i_state = want_response ?
2806 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2807 spin_unlock_bh(&cmd->istate_lock);
2808
2809 return 0;
2810 }
2811
2812 static int iscsit_send_nopin_response(
2813 struct iscsi_cmd *cmd,
2814 struct iscsi_conn *conn)
2815 {
2816 int niov = 0, tx_size;
2817 u32 padding = 0;
2818 struct kvec *iov;
2819 struct iscsi_nopin *hdr;
2820
2821 tx_size = ISCSI_HDR_LEN;
2822 hdr = (struct iscsi_nopin *) cmd->pdu;
2823 memset(hdr, 0, ISCSI_HDR_LEN);
2824 hdr->opcode = ISCSI_OP_NOOP_IN;
2825 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2826 hton24(hdr->dlength, cmd->buf_ptr_size);
2827 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2828 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2829 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2830 cmd->stat_sn = conn->stat_sn++;
2831 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2832
2833 iscsit_increment_maxcmdsn(cmd, conn->sess);
2834 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2835 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2836
2837 iov = &cmd->iov_misc[0];
2838 iov[niov].iov_base = cmd->pdu;
2839 iov[niov++].iov_len = ISCSI_HDR_LEN;
2840
2841 if (conn->conn_ops->HeaderDigest) {
2842 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2843
2844 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2845 (unsigned char *)hdr, ISCSI_HDR_LEN,
2846 0, NULL, (u8 *)header_digest);
2847
2848 iov[0].iov_len += ISCSI_CRC_LEN;
2849 tx_size += ISCSI_CRC_LEN;
2850 pr_debug("Attaching CRC32C HeaderDigest"
2851 " to NopIn 0x%08x\n", *header_digest);
2852 }
2853
2854 /*
2855 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2856 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2857 */
2858 if (cmd->buf_ptr_size) {
2859 iov[niov].iov_base = cmd->buf_ptr;
2860 iov[niov++].iov_len = cmd->buf_ptr_size;
2861 tx_size += cmd->buf_ptr_size;
2862
2863 pr_debug("Echoing back %u bytes of ping"
2864 " data.\n", cmd->buf_ptr_size);
2865
2866 padding = ((-cmd->buf_ptr_size) & 3);
2867 if (padding != 0) {
2868 iov[niov].iov_base = &cmd->pad_bytes;
2869 iov[niov++].iov_len = padding;
2870 tx_size += padding;
2871 pr_debug("Attaching %u additional"
2872 " padding bytes.\n", padding);
2873 }
2874 if (conn->conn_ops->DataDigest) {
2875 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2876 cmd->buf_ptr, cmd->buf_ptr_size,
2877 padding, (u8 *)&cmd->pad_bytes,
2878 (u8 *)&cmd->data_crc);
2879
2880 iov[niov].iov_base = &cmd->data_crc;
2881 iov[niov++].iov_len = ISCSI_CRC_LEN;
2882 tx_size += ISCSI_CRC_LEN;
2883 pr_debug("Attached DataDigest for %u"
2884 " bytes of ping data, CRC 0x%08x\n",
2885 cmd->buf_ptr_size, cmd->data_crc);
2886 }
2887 }
2888
2889 cmd->iov_misc_count = niov;
2890 cmd->tx_size = tx_size;
2891
2892 pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2893 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2894 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2895
2896 return 0;
2897 }
2898
2899 static int iscsit_send_r2t(
2900 struct iscsi_cmd *cmd,
2901 struct iscsi_conn *conn)
2902 {
2903 int tx_size = 0;
2904 struct iscsi_r2t *r2t;
2905 struct iscsi_r2t_rsp *hdr;
2906 int ret;
2907
2908 r2t = iscsit_get_r2t_from_list(cmd);
2909 if (!r2t)
2910 return -1;
2911
2912 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
2913 memset(hdr, 0, ISCSI_HDR_LEN);
2914 hdr->opcode = ISCSI_OP_R2T;
2915 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2916 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2917 (struct scsi_lun *)&hdr->lun);
2918 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2919 spin_lock_bh(&conn->sess->ttt_lock);
2920 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2921 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2922 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2923 spin_unlock_bh(&conn->sess->ttt_lock);
2924 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
2925 hdr->statsn = cpu_to_be32(conn->stat_sn);
2926 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2927 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2928 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
2929 hdr->data_offset = cpu_to_be32(r2t->offset);
2930 hdr->data_length = cpu_to_be32(r2t->xfer_len);
2931
2932 cmd->iov_misc[0].iov_base = cmd->pdu;
2933 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
2934 tx_size += ISCSI_HDR_LEN;
2935
2936 if (conn->conn_ops->HeaderDigest) {
2937 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2938
2939 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2940 (unsigned char *)hdr, ISCSI_HDR_LEN,
2941 0, NULL, (u8 *)header_digest);
2942
2943 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2944 tx_size += ISCSI_CRC_LEN;
2945 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2946 " PDU 0x%08x\n", *header_digest);
2947 }
2948
2949 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2950 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2951 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2952 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2953 r2t->offset, r2t->xfer_len, conn->cid);
2954
2955 cmd->iov_misc_count = 1;
2956 cmd->tx_size = tx_size;
2957
2958 spin_lock_bh(&cmd->r2t_lock);
2959 r2t->sent_r2t = 1;
2960 spin_unlock_bh(&cmd->r2t_lock);
2961
2962 ret = iscsit_send_tx_data(cmd, conn, 1);
2963 if (ret < 0) {
2964 iscsit_tx_thread_wait_for_tcp(conn);
2965 return ret;
2966 }
2967
2968 spin_lock_bh(&cmd->dataout_timeout_lock);
2969 iscsit_start_dataout_timer(cmd, conn);
2970 spin_unlock_bh(&cmd->dataout_timeout_lock);
2971
2972 return 0;
2973 }
2974
2975 /*
2976 * @recovery: If called from iscsi_task_reassign_complete_write() for
2977 * connection recovery.
2978 */
2979 int iscsit_build_r2ts_for_cmd(
2980 struct iscsi_cmd *cmd,
2981 struct iscsi_conn *conn,
2982 bool recovery)
2983 {
2984 int first_r2t = 1;
2985 u32 offset = 0, xfer_len = 0;
2986
2987 spin_lock_bh(&cmd->r2t_lock);
2988 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2989 spin_unlock_bh(&cmd->r2t_lock);
2990 return 0;
2991 }
2992
2993 if (conn->sess->sess_ops->DataSequenceInOrder &&
2994 !recovery)
2995 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
2996
2997 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2998 if (conn->sess->sess_ops->DataSequenceInOrder) {
2999 offset = cmd->r2t_offset;
3000
3001 if (first_r2t && recovery) {
3002 int new_data_end = offset +
3003 conn->sess->sess_ops->MaxBurstLength -
3004 cmd->next_burst_len;
3005
3006 if (new_data_end > cmd->se_cmd.data_length)
3007 xfer_len = cmd->se_cmd.data_length - offset;
3008 else
3009 xfer_len =
3010 conn->sess->sess_ops->MaxBurstLength -
3011 cmd->next_burst_len;
3012 } else {
3013 int new_data_end = offset +
3014 conn->sess->sess_ops->MaxBurstLength;
3015
3016 if (new_data_end > cmd->se_cmd.data_length)
3017 xfer_len = cmd->se_cmd.data_length - offset;
3018 else
3019 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3020 }
3021 cmd->r2t_offset += xfer_len;
3022
3023 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3024 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3025 } else {
3026 struct iscsi_seq *seq;
3027
3028 seq = iscsit_get_seq_holder_for_r2t(cmd);
3029 if (!seq) {
3030 spin_unlock_bh(&cmd->r2t_lock);
3031 return -1;
3032 }
3033
3034 offset = seq->offset;
3035 xfer_len = seq->xfer_len;
3036
3037 if (cmd->seq_send_order == cmd->seq_count)
3038 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3039 }
3040 cmd->outstanding_r2ts++;
3041 first_r2t = 0;
3042
3043 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3044 spin_unlock_bh(&cmd->r2t_lock);
3045 return -1;
3046 }
3047
3048 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3049 break;
3050 }
3051 spin_unlock_bh(&cmd->r2t_lock);
3052
3053 return 0;
3054 }
3055
3056 static int iscsit_send_status(
3057 struct iscsi_cmd *cmd,
3058 struct iscsi_conn *conn)
3059 {
3060 u8 iov_count = 0, recovery;
3061 u32 padding = 0, tx_size = 0;
3062 struct iscsi_scsi_rsp *hdr;
3063 struct kvec *iov;
3064
3065 recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3066 if (!recovery)
3067 cmd->stat_sn = conn->stat_sn++;
3068
3069 spin_lock_bh(&conn->sess->session_stats_lock);
3070 conn->sess->rsp_pdus++;
3071 spin_unlock_bh(&conn->sess->session_stats_lock);
3072
3073 hdr = (struct iscsi_scsi_rsp *) cmd->pdu;
3074 memset(hdr, 0, ISCSI_HDR_LEN);
3075 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3076 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3077 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3078 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3079 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3080 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3081 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3082 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3083 }
3084 hdr->response = cmd->iscsi_response;
3085 hdr->cmd_status = cmd->se_cmd.scsi_status;
3086 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3087 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3088
3089 iscsit_increment_maxcmdsn(cmd, conn->sess);
3090 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3091 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3092
3093 iov = &cmd->iov_misc[0];
3094 iov[iov_count].iov_base = cmd->pdu;
3095 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3096 tx_size += ISCSI_HDR_LEN;
3097
3098 /*
3099 * Attach SENSE DATA payload to iSCSI Response PDU
3100 */
3101 if (cmd->se_cmd.sense_buffer &&
3102 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3103 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3104 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3105 hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
3106 iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
3107 iov[iov_count++].iov_len =
3108 (cmd->se_cmd.scsi_sense_length + padding);
3109 tx_size += cmd->se_cmd.scsi_sense_length;
3110
3111 if (padding) {
3112 memset(cmd->se_cmd.sense_buffer +
3113 cmd->se_cmd.scsi_sense_length, 0, padding);
3114 tx_size += padding;
3115 pr_debug("Adding %u bytes of padding to"
3116 " SENSE.\n", padding);
3117 }
3118
3119 if (conn->conn_ops->DataDigest) {
3120 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3121 cmd->se_cmd.sense_buffer,
3122 (cmd->se_cmd.scsi_sense_length + padding),
3123 0, NULL, (u8 *)&cmd->data_crc);
3124
3125 iov[iov_count].iov_base = &cmd->data_crc;
3126 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3127 tx_size += ISCSI_CRC_LEN;
3128
3129 pr_debug("Attaching CRC32 DataDigest for"
3130 " SENSE, %u bytes CRC 0x%08x\n",
3131 (cmd->se_cmd.scsi_sense_length + padding),
3132 cmd->data_crc);
3133 }
3134
3135 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3136 " Response PDU\n",
3137 cmd->se_cmd.scsi_sense_length);
3138 }
3139
3140 if (conn->conn_ops->HeaderDigest) {
3141 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3142
3143 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3144 (unsigned char *)hdr, ISCSI_HDR_LEN,
3145 0, NULL, (u8 *)header_digest);
3146
3147 iov[0].iov_len += ISCSI_CRC_LEN;
3148 tx_size += ISCSI_CRC_LEN;
3149 pr_debug("Attaching CRC32 HeaderDigest for Response"
3150 " PDU 0x%08x\n", *header_digest);
3151 }
3152
3153 cmd->iov_misc_count = iov_count;
3154 cmd->tx_size = tx_size;
3155
3156 pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3157 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3158 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3159 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3160
3161 return 0;
3162 }
3163
3164 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3165 {
3166 switch (se_tmr->response) {
3167 case TMR_FUNCTION_COMPLETE:
3168 return ISCSI_TMF_RSP_COMPLETE;
3169 case TMR_TASK_DOES_NOT_EXIST:
3170 return ISCSI_TMF_RSP_NO_TASK;
3171 case TMR_LUN_DOES_NOT_EXIST:
3172 return ISCSI_TMF_RSP_NO_LUN;
3173 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3174 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3175 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3176 return ISCSI_TMF_RSP_AUTH_FAILED;
3177 case TMR_FUNCTION_REJECTED:
3178 default:
3179 return ISCSI_TMF_RSP_REJECTED;
3180 }
3181 }
3182
3183 static int iscsit_send_task_mgt_rsp(
3184 struct iscsi_cmd *cmd,
3185 struct iscsi_conn *conn)
3186 {
3187 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3188 struct iscsi_tm_rsp *hdr;
3189 u32 tx_size = 0;
3190
3191 hdr = (struct iscsi_tm_rsp *) cmd->pdu;
3192 memset(hdr, 0, ISCSI_HDR_LEN);
3193 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3194 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3195 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3196 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3197 cmd->stat_sn = conn->stat_sn++;
3198 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3199
3200 iscsit_increment_maxcmdsn(cmd, conn->sess);
3201 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3202 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3203
3204 cmd->iov_misc[0].iov_base = cmd->pdu;
3205 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3206 tx_size += ISCSI_HDR_LEN;
3207
3208 if (conn->conn_ops->HeaderDigest) {
3209 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3210
3211 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3212 (unsigned char *)hdr, ISCSI_HDR_LEN,
3213 0, NULL, (u8 *)header_digest);
3214
3215 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3216 tx_size += ISCSI_CRC_LEN;
3217 pr_debug("Attaching CRC32 HeaderDigest for Task"
3218 " Mgmt Response PDU 0x%08x\n", *header_digest);
3219 }
3220
3221 cmd->iov_misc_count = 1;
3222 cmd->tx_size = tx_size;
3223
3224 pr_debug("Built Task Management Response ITT: 0x%08x,"
3225 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3226 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3227
3228 return 0;
3229 }
3230
3231 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3232 {
3233 bool ret = false;
3234
3235 if (np->np_sockaddr.ss_family == AF_INET6) {
3236 const struct sockaddr_in6 sin6 = {
3237 .sin6_addr = IN6ADDR_ANY_INIT };
3238 struct sockaddr_in6 *sock_in6 =
3239 (struct sockaddr_in6 *)&np->np_sockaddr;
3240
3241 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3242 sin6.sin6_addr.s6_addr, 16))
3243 ret = true;
3244 } else {
3245 struct sockaddr_in * sock_in =
3246 (struct sockaddr_in *)&np->np_sockaddr;
3247
3248 if (sock_in->sin_addr.s_addr == INADDR_ANY)
3249 ret = true;
3250 }
3251
3252 return ret;
3253 }
3254
3255 #define SENDTARGETS_BUF_LIMIT 32768U
3256
3257 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3258 {
3259 char *payload = NULL;
3260 struct iscsi_conn *conn = cmd->conn;
3261 struct iscsi_portal_group *tpg;
3262 struct iscsi_tiqn *tiqn;
3263 struct iscsi_tpg_np *tpg_np;
3264 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3265 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3266
3267 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3268 SENDTARGETS_BUF_LIMIT);
3269
3270 payload = kzalloc(buffer_len, GFP_KERNEL);
3271 if (!payload) {
3272 pr_err("Unable to allocate memory for sendtargets"
3273 " response.\n");
3274 return -ENOMEM;
3275 }
3276
3277 spin_lock(&tiqn_lock);
3278 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3279 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3280 len += 1;
3281
3282 if ((len + payload_len) > buffer_len) {
3283 spin_unlock(&tiqn->tiqn_tpg_lock);
3284 end_of_buf = 1;
3285 goto eob;
3286 }
3287 memcpy(payload + payload_len, buf, len);
3288 payload_len += len;
3289
3290 spin_lock(&tiqn->tiqn_tpg_lock);
3291 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3292
3293 spin_lock(&tpg->tpg_state_lock);
3294 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3295 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3296 spin_unlock(&tpg->tpg_state_lock);
3297 continue;
3298 }
3299 spin_unlock(&tpg->tpg_state_lock);
3300
3301 spin_lock(&tpg->tpg_np_lock);
3302 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3303 tpg_np_list) {
3304 struct iscsi_np *np = tpg_np->tpg_np;
3305 bool inaddr_any = iscsit_check_inaddr_any(np);
3306
3307 len = sprintf(buf, "TargetAddress="
3308 "%s%s%s:%hu,%hu",
3309 (np->np_sockaddr.ss_family == AF_INET6) ?
3310 "[" : "", (inaddr_any == false) ?
3311 np->np_ip : conn->local_ip,
3312 (np->np_sockaddr.ss_family == AF_INET6) ?
3313 "]" : "", (inaddr_any == false) ?
3314 np->np_port : conn->local_port,
3315 tpg->tpgt);
3316 len += 1;
3317
3318 if ((len + payload_len) > buffer_len) {
3319 spin_unlock(&tpg->tpg_np_lock);
3320 spin_unlock(&tiqn->tiqn_tpg_lock);
3321 end_of_buf = 1;
3322 goto eob;
3323 }
3324 memcpy(payload + payload_len, buf, len);
3325 payload_len += len;
3326 }
3327 spin_unlock(&tpg->tpg_np_lock);
3328 }
3329 spin_unlock(&tiqn->tiqn_tpg_lock);
3330 eob:
3331 if (end_of_buf)
3332 break;
3333 }
3334 spin_unlock(&tiqn_lock);
3335
3336 cmd->buf_ptr = payload;
3337
3338 return payload_len;
3339 }
3340
3341 /*
3342 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3343 * MaxRecvDataSegmentLength.
3344 */
3345 static int iscsit_send_text_rsp(
3346 struct iscsi_cmd *cmd,
3347 struct iscsi_conn *conn)
3348 {
3349 struct iscsi_text_rsp *hdr;
3350 struct kvec *iov;
3351 u32 padding = 0, tx_size = 0;
3352 int text_length, iov_count = 0;
3353
3354 text_length = iscsit_build_sendtargets_response(cmd);
3355 if (text_length < 0)
3356 return text_length;
3357
3358 padding = ((-text_length) & 3);
3359 if (padding != 0) {
3360 memset(cmd->buf_ptr + text_length, 0, padding);
3361 pr_debug("Attaching %u additional bytes for"
3362 " padding.\n", padding);
3363 }
3364
3365 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3366 memset(hdr, 0, ISCSI_HDR_LEN);
3367 hdr->opcode = ISCSI_OP_TEXT_RSP;
3368 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3369 hton24(hdr->dlength, text_length);
3370 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3371 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3372 cmd->stat_sn = conn->stat_sn++;
3373 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3374
3375 iscsit_increment_maxcmdsn(cmd, conn->sess);
3376 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3377 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3378
3379 iov = &cmd->iov_misc[0];
3380
3381 iov[iov_count].iov_base = cmd->pdu;
3382 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3383 iov[iov_count].iov_base = cmd->buf_ptr;
3384 iov[iov_count++].iov_len = text_length + padding;
3385
3386 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3387
3388 if (conn->conn_ops->HeaderDigest) {
3389 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3390
3391 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3392 (unsigned char *)hdr, ISCSI_HDR_LEN,
3393 0, NULL, (u8 *)header_digest);
3394
3395 iov[0].iov_len += ISCSI_CRC_LEN;
3396 tx_size += ISCSI_CRC_LEN;
3397 pr_debug("Attaching CRC32 HeaderDigest for"
3398 " Text Response PDU 0x%08x\n", *header_digest);
3399 }
3400
3401 if (conn->conn_ops->DataDigest) {
3402 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3403 cmd->buf_ptr, (text_length + padding),
3404 0, NULL, (u8 *)&cmd->data_crc);
3405
3406 iov[iov_count].iov_base = &cmd->data_crc;
3407 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3408 tx_size += ISCSI_CRC_LEN;
3409
3410 pr_debug("Attaching DataDigest for %u bytes of text"
3411 " data, CRC 0x%08x\n", (text_length + padding),
3412 cmd->data_crc);
3413 }
3414
3415 cmd->iov_misc_count = iov_count;
3416 cmd->tx_size = tx_size;
3417
3418 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3419 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3420 text_length, conn->cid);
3421 return 0;
3422 }
3423
3424 static int iscsit_send_reject(
3425 struct iscsi_cmd *cmd,
3426 struct iscsi_conn *conn)
3427 {
3428 u32 iov_count = 0, tx_size = 0;
3429 struct iscsi_reject *hdr;
3430 struct kvec *iov;
3431
3432 hdr = (struct iscsi_reject *) cmd->pdu;
3433 hdr->opcode = ISCSI_OP_REJECT;
3434 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3435 hton24(hdr->dlength, ISCSI_HDR_LEN);
3436 cmd->stat_sn = conn->stat_sn++;
3437 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3438 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3439 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3440
3441 iov = &cmd->iov_misc[0];
3442
3443 iov[iov_count].iov_base = cmd->pdu;
3444 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3445 iov[iov_count].iov_base = cmd->buf_ptr;
3446 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3447
3448 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3449
3450 if (conn->conn_ops->HeaderDigest) {
3451 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3452
3453 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3454 (unsigned char *)hdr, ISCSI_HDR_LEN,
3455 0, NULL, (u8 *)header_digest);
3456
3457 iov[0].iov_len += ISCSI_CRC_LEN;
3458 tx_size += ISCSI_CRC_LEN;
3459 pr_debug("Attaching CRC32 HeaderDigest for"
3460 " REJECT PDU 0x%08x\n", *header_digest);
3461 }
3462
3463 if (conn->conn_ops->DataDigest) {
3464 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3465 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3466 0, NULL, (u8 *)&cmd->data_crc);
3467
3468 iov[iov_count].iov_base = &cmd->data_crc;
3469 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3470 tx_size += ISCSI_CRC_LEN;
3471 pr_debug("Attaching CRC32 DataDigest for REJECT"
3472 " PDU 0x%08x\n", cmd->data_crc);
3473 }
3474
3475 cmd->iov_misc_count = iov_count;
3476 cmd->tx_size = tx_size;
3477
3478 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3479 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3480
3481 return 0;
3482 }
3483
3484 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3485 {
3486 struct iscsi_thread_set *ts = conn->thread_set;
3487 int ord, cpu;
3488 /*
3489 * thread_id is assigned from iscsit_global->ts_bitmap from
3490 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3491 *
3492 * Here we use thread_id to determine which CPU that this
3493 * iSCSI connection's iscsi_thread_set will be scheduled to
3494 * execute upon.
3495 */
3496 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3497 for_each_online_cpu(cpu) {
3498 if (ord-- == 0) {
3499 cpumask_set_cpu(cpu, conn->conn_cpumask);
3500 return;
3501 }
3502 }
3503 /*
3504 * This should never be reached..
3505 */
3506 dump_stack();
3507 cpumask_setall(conn->conn_cpumask);
3508 }
3509
3510 static inline void iscsit_thread_check_cpumask(
3511 struct iscsi_conn *conn,
3512 struct task_struct *p,
3513 int mode)
3514 {
3515 char buf[128];
3516 /*
3517 * mode == 1 signals iscsi_target_tx_thread() usage.
3518 * mode == 0 signals iscsi_target_rx_thread() usage.
3519 */
3520 if (mode == 1) {
3521 if (!conn->conn_tx_reset_cpumask)
3522 return;
3523 conn->conn_tx_reset_cpumask = 0;
3524 } else {
3525 if (!conn->conn_rx_reset_cpumask)
3526 return;
3527 conn->conn_rx_reset_cpumask = 0;
3528 }
3529 /*
3530 * Update the CPU mask for this single kthread so that
3531 * both TX and RX kthreads are scheduled to run on the
3532 * same CPU.
3533 */
3534 memset(buf, 0, 128);
3535 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3536 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3537 }
3538
3539 static int handle_immediate_queue(struct iscsi_conn *conn)
3540 {
3541 struct iscsi_queue_req *qr;
3542 struct iscsi_cmd *cmd;
3543 u8 state;
3544 int ret;
3545
3546 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3547 atomic_set(&conn->check_immediate_queue, 0);
3548 cmd = qr->cmd;
3549 state = qr->state;
3550 kmem_cache_free(lio_qr_cache, qr);
3551
3552 switch (state) {
3553 case ISTATE_SEND_R2T:
3554 ret = iscsit_send_r2t(cmd, conn);
3555 if (ret < 0)
3556 goto err;
3557 break;
3558 case ISTATE_REMOVE:
3559 if (cmd->data_direction == DMA_TO_DEVICE)
3560 iscsit_stop_dataout_timer(cmd);
3561
3562 spin_lock_bh(&conn->cmd_lock);
3563 list_del(&cmd->i_conn_node);
3564 spin_unlock_bh(&conn->cmd_lock);
3565
3566 iscsit_free_cmd(cmd);
3567 continue;
3568 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3569 iscsit_mod_nopin_response_timer(conn);
3570 ret = iscsit_send_unsolicited_nopin(cmd,
3571 conn, 1);
3572 if (ret < 0)
3573 goto err;
3574 break;
3575 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3576 ret = iscsit_send_unsolicited_nopin(cmd,
3577 conn, 0);
3578 if (ret < 0)
3579 goto err;
3580 break;
3581 default:
3582 pr_err("Unknown Opcode: 0x%02x ITT:"
3583 " 0x%08x, i_state: %d on CID: %hu\n",
3584 cmd->iscsi_opcode, cmd->init_task_tag, state,
3585 conn->cid);
3586 goto err;
3587 }
3588 }
3589
3590 return 0;
3591
3592 err:
3593 return -1;
3594 }
3595
3596 static int handle_response_queue(struct iscsi_conn *conn)
3597 {
3598 struct iscsi_queue_req *qr;
3599 struct iscsi_cmd *cmd;
3600 u8 state;
3601 int ret;
3602
3603 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3604 cmd = qr->cmd;
3605 state = qr->state;
3606 kmem_cache_free(lio_qr_cache, qr);
3607
3608 check_rsp_state:
3609 switch (state) {
3610 case ISTATE_SEND_DATAIN:
3611 ret = iscsit_send_data_in(cmd, conn);
3612 if (ret < 0)
3613 goto err;
3614 else if (!ret)
3615 /* more drs */
3616 goto check_rsp_state;
3617 else if (ret == 1) {
3618 /* all done */
3619 spin_lock_bh(&cmd->istate_lock);
3620 cmd->i_state = ISTATE_SENT_STATUS;
3621 spin_unlock_bh(&cmd->istate_lock);
3622 continue;
3623 } else if (ret == 2) {
3624 /* Still must send status,
3625 SCF_TRANSPORT_TASK_SENSE was set */
3626 spin_lock_bh(&cmd->istate_lock);
3627 cmd->i_state = ISTATE_SEND_STATUS;
3628 spin_unlock_bh(&cmd->istate_lock);
3629 state = ISTATE_SEND_STATUS;
3630 goto check_rsp_state;
3631 }
3632
3633 break;
3634 case ISTATE_SEND_STATUS:
3635 case ISTATE_SEND_STATUS_RECOVERY:
3636 ret = iscsit_send_status(cmd, conn);
3637 break;
3638 case ISTATE_SEND_LOGOUTRSP:
3639 ret = iscsit_send_logout_response(cmd, conn);
3640 break;
3641 case ISTATE_SEND_ASYNCMSG:
3642 ret = iscsit_send_conn_drop_async_message(
3643 cmd, conn);
3644 break;
3645 case ISTATE_SEND_NOPIN:
3646 ret = iscsit_send_nopin_response(cmd, conn);
3647 break;
3648 case ISTATE_SEND_REJECT:
3649 ret = iscsit_send_reject(cmd, conn);
3650 break;
3651 case ISTATE_SEND_TASKMGTRSP:
3652 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3653 if (ret != 0)
3654 break;
3655 ret = iscsit_tmr_post_handler(cmd, conn);
3656 if (ret != 0)
3657 iscsit_fall_back_to_erl0(conn->sess);
3658 break;
3659 case ISTATE_SEND_TEXTRSP:
3660 ret = iscsit_send_text_rsp(cmd, conn);
3661 break;
3662 default:
3663 pr_err("Unknown Opcode: 0x%02x ITT:"
3664 " 0x%08x, i_state: %d on CID: %hu\n",
3665 cmd->iscsi_opcode, cmd->init_task_tag,
3666 state, conn->cid);
3667 goto err;
3668 }
3669 if (ret < 0)
3670 goto err;
3671
3672 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3673 iscsit_tx_thread_wait_for_tcp(conn);
3674 iscsit_unmap_iovec(cmd);
3675 goto err;
3676 }
3677 iscsit_unmap_iovec(cmd);
3678
3679 switch (state) {
3680 case ISTATE_SEND_LOGOUTRSP:
3681 if (!iscsit_logout_post_handler(cmd, conn))
3682 goto restart;
3683 /* fall through */
3684 case ISTATE_SEND_STATUS:
3685 case ISTATE_SEND_ASYNCMSG:
3686 case ISTATE_SEND_NOPIN:
3687 case ISTATE_SEND_STATUS_RECOVERY:
3688 case ISTATE_SEND_TEXTRSP:
3689 case ISTATE_SEND_TASKMGTRSP:
3690 spin_lock_bh(&cmd->istate_lock);
3691 cmd->i_state = ISTATE_SENT_STATUS;
3692 spin_unlock_bh(&cmd->istate_lock);
3693 break;
3694 case ISTATE_SEND_REJECT:
3695 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3696 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3697 complete(&cmd->reject_comp);
3698 goto err;
3699 }
3700 complete(&cmd->reject_comp);
3701 break;
3702 default:
3703 pr_err("Unknown Opcode: 0x%02x ITT:"
3704 " 0x%08x, i_state: %d on CID: %hu\n",
3705 cmd->iscsi_opcode, cmd->init_task_tag,
3706 cmd->i_state, conn->cid);
3707 goto err;
3708 }
3709
3710 if (atomic_read(&conn->check_immediate_queue))
3711 break;
3712 }
3713
3714 return 0;
3715
3716 err:
3717 return -1;
3718 restart:
3719 return -EAGAIN;
3720 }
3721
3722 int iscsi_target_tx_thread(void *arg)
3723 {
3724 int ret = 0;
3725 struct iscsi_conn *conn;
3726 struct iscsi_thread_set *ts = arg;
3727 /*
3728 * Allow ourselves to be interrupted by SIGINT so that a
3729 * connection recovery / failure event can be triggered externally.
3730 */
3731 allow_signal(SIGINT);
3732
3733 restart:
3734 conn = iscsi_tx_thread_pre_handler(ts);
3735 if (!conn)
3736 goto out;
3737
3738 ret = 0;
3739
3740 while (!kthread_should_stop()) {
3741 /*
3742 * Ensure that both TX and RX per connection kthreads
3743 * are scheduled to run on the same CPU.
3744 */
3745 iscsit_thread_check_cpumask(conn, current, 1);
3746
3747 schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
3748
3749 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3750 signal_pending(current))
3751 goto transport_err;
3752
3753 ret = handle_immediate_queue(conn);
3754 if (ret < 0)
3755 goto transport_err;
3756
3757 ret = handle_response_queue(conn);
3758 if (ret == -EAGAIN)
3759 goto restart;
3760 else if (ret < 0)
3761 goto transport_err;
3762 }
3763
3764 transport_err:
3765 iscsit_take_action_for_connection_exit(conn);
3766 goto restart;
3767 out:
3768 return 0;
3769 }
3770
3771 int iscsi_target_rx_thread(void *arg)
3772 {
3773 int ret;
3774 u8 buffer[ISCSI_HDR_LEN], opcode;
3775 u32 checksum = 0, digest = 0;
3776 struct iscsi_conn *conn = NULL;
3777 struct iscsi_thread_set *ts = arg;
3778 struct kvec iov;
3779 /*
3780 * Allow ourselves to be interrupted by SIGINT so that a
3781 * connection recovery / failure event can be triggered externally.
3782 */
3783 allow_signal(SIGINT);
3784
3785 restart:
3786 conn = iscsi_rx_thread_pre_handler(ts);
3787 if (!conn)
3788 goto out;
3789
3790 while (!kthread_should_stop()) {
3791 /*
3792 * Ensure that both TX and RX per connection kthreads
3793 * are scheduled to run on the same CPU.
3794 */
3795 iscsit_thread_check_cpumask(conn, current, 0);
3796
3797 memset(buffer, 0, ISCSI_HDR_LEN);
3798 memset(&iov, 0, sizeof(struct kvec));
3799
3800 iov.iov_base = buffer;
3801 iov.iov_len = ISCSI_HDR_LEN;
3802
3803 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3804 if (ret != ISCSI_HDR_LEN) {
3805 iscsit_rx_thread_wait_for_tcp(conn);
3806 goto transport_err;
3807 }
3808
3809 /*
3810 * Set conn->bad_hdr for use with REJECT PDUs.
3811 */
3812 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3813
3814 if (conn->conn_ops->HeaderDigest) {
3815 iov.iov_base = &digest;
3816 iov.iov_len = ISCSI_CRC_LEN;
3817
3818 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3819 if (ret != ISCSI_CRC_LEN) {
3820 iscsit_rx_thread_wait_for_tcp(conn);
3821 goto transport_err;
3822 }
3823
3824 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3825 buffer, ISCSI_HDR_LEN,
3826 0, NULL, (u8 *)&checksum);
3827
3828 if (digest != checksum) {
3829 pr_err("HeaderDigest CRC32C failed,"
3830 " received 0x%08x, computed 0x%08x\n",
3831 digest, checksum);
3832 /*
3833 * Set the PDU to 0xff so it will intentionally
3834 * hit default in the switch below.
3835 */
3836 memset(buffer, 0xff, ISCSI_HDR_LEN);
3837 spin_lock_bh(&conn->sess->session_stats_lock);
3838 conn->sess->conn_digest_errors++;
3839 spin_unlock_bh(&conn->sess->session_stats_lock);
3840 } else {
3841 pr_debug("Got HeaderDigest CRC32C"
3842 " 0x%08x\n", checksum);
3843 }
3844 }
3845
3846 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3847 goto transport_err;
3848
3849 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3850
3851 if (conn->sess->sess_ops->SessionType &&
3852 ((!(opcode & ISCSI_OP_TEXT)) ||
3853 (!(opcode & ISCSI_OP_LOGOUT)))) {
3854 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3855 " while in Discovery Session, rejecting.\n", opcode);
3856 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3857 buffer, conn);
3858 goto transport_err;
3859 }
3860
3861 switch (opcode) {
3862 case ISCSI_OP_SCSI_CMD:
3863 if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3864 goto transport_err;
3865 break;
3866 case ISCSI_OP_SCSI_DATA_OUT:
3867 if (iscsit_handle_data_out(conn, buffer) < 0)
3868 goto transport_err;
3869 break;
3870 case ISCSI_OP_NOOP_OUT:
3871 if (iscsit_handle_nop_out(conn, buffer) < 0)
3872 goto transport_err;
3873 break;
3874 case ISCSI_OP_SCSI_TMFUNC:
3875 if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3876 goto transport_err;
3877 break;
3878 case ISCSI_OP_TEXT:
3879 if (iscsit_handle_text_cmd(conn, buffer) < 0)
3880 goto transport_err;
3881 break;
3882 case ISCSI_OP_LOGOUT:
3883 ret = iscsit_handle_logout_cmd(conn, buffer);
3884 if (ret > 0) {
3885 wait_for_completion_timeout(&conn->conn_logout_comp,
3886 SECONDS_FOR_LOGOUT_COMP * HZ);
3887 goto transport_err;
3888 } else if (ret < 0)
3889 goto transport_err;
3890 break;
3891 case ISCSI_OP_SNACK:
3892 if (iscsit_handle_snack(conn, buffer) < 0)
3893 goto transport_err;
3894 break;
3895 default:
3896 pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3897 opcode);
3898 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3899 pr_err("Cannot recover from unknown"
3900 " opcode while ERL=0, closing iSCSI connection"
3901 ".\n");
3902 goto transport_err;
3903 }
3904 if (!conn->conn_ops->OFMarker) {
3905 pr_err("Unable to recover from unknown"
3906 " opcode while OFMarker=No, closing iSCSI"
3907 " connection.\n");
3908 goto transport_err;
3909 }
3910 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3911 pr_err("Unable to recover from unknown"
3912 " opcode, closing iSCSI connection.\n");
3913 goto transport_err;
3914 }
3915 break;
3916 }
3917 }
3918
3919 transport_err:
3920 if (!signal_pending(current))
3921 atomic_set(&conn->transport_failed, 1);
3922 iscsit_take_action_for_connection_exit(conn);
3923 goto restart;
3924 out:
3925 return 0;
3926 }
3927
3928 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3929 {
3930 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3931 struct iscsi_session *sess = conn->sess;
3932 /*
3933 * We expect this function to only ever be called from either RX or TX
3934 * thread context via iscsit_close_connection() once the other context
3935 * has been reset -> returned sleeping pre-handler state.
3936 */
3937 spin_lock_bh(&conn->cmd_lock);
3938 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
3939
3940 list_del(&cmd->i_conn_node);
3941 spin_unlock_bh(&conn->cmd_lock);
3942
3943 iscsit_increment_maxcmdsn(cmd, sess);
3944
3945 iscsit_free_cmd(cmd);
3946
3947 spin_lock_bh(&conn->cmd_lock);
3948 }
3949 spin_unlock_bh(&conn->cmd_lock);
3950 }
3951
3952 static void iscsit_stop_timers_for_cmds(
3953 struct iscsi_conn *conn)
3954 {
3955 struct iscsi_cmd *cmd;
3956
3957 spin_lock_bh(&conn->cmd_lock);
3958 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
3959 if (cmd->data_direction == DMA_TO_DEVICE)
3960 iscsit_stop_dataout_timer(cmd);
3961 }
3962 spin_unlock_bh(&conn->cmd_lock);
3963 }
3964
3965 int iscsit_close_connection(
3966 struct iscsi_conn *conn)
3967 {
3968 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3969 struct iscsi_session *sess = conn->sess;
3970
3971 pr_debug("Closing iSCSI connection CID %hu on SID:"
3972 " %u\n", conn->cid, sess->sid);
3973 /*
3974 * Always up conn_logout_comp just in case the RX Thread is sleeping
3975 * and the logout response never got sent because the connection
3976 * failed.
3977 */
3978 complete(&conn->conn_logout_comp);
3979
3980 iscsi_release_thread_set(conn);
3981
3982 iscsit_stop_timers_for_cmds(conn);
3983 iscsit_stop_nopin_response_timer(conn);
3984 iscsit_stop_nopin_timer(conn);
3985 iscsit_free_queue_reqs_for_conn(conn);
3986
3987 /*
3988 * During Connection recovery drop unacknowledged out of order
3989 * commands for this connection, and prepare the other commands
3990 * for realligence.
3991 *
3992 * During normal operation clear the out of order commands (but
3993 * do not free the struct iscsi_ooo_cmdsn's) and release all
3994 * struct iscsi_cmds.
3995 */
3996 if (atomic_read(&conn->connection_recovery)) {
3997 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
3998 iscsit_prepare_cmds_for_realligance(conn);
3999 } else {
4000 iscsit_clear_ooo_cmdsns_for_conn(conn);
4001 iscsit_release_commands_from_conn(conn);
4002 }
4003
4004 /*
4005 * Handle decrementing session or connection usage count if
4006 * a logout response was not able to be sent because the
4007 * connection failed. Fall back to Session Recovery here.
4008 */
4009 if (atomic_read(&conn->conn_logout_remove)) {
4010 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4011 iscsit_dec_conn_usage_count(conn);
4012 iscsit_dec_session_usage_count(sess);
4013 }
4014 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4015 iscsit_dec_conn_usage_count(conn);
4016
4017 atomic_set(&conn->conn_logout_remove, 0);
4018 atomic_set(&sess->session_reinstatement, 0);
4019 atomic_set(&sess->session_fall_back_to_erl0, 1);
4020 }
4021
4022 spin_lock_bh(&sess->conn_lock);
4023 list_del(&conn->conn_list);
4024
4025 /*
4026 * Attempt to let the Initiator know this connection failed by
4027 * sending an Connection Dropped Async Message on another
4028 * active connection.
4029 */
4030 if (atomic_read(&conn->connection_recovery))
4031 iscsit_build_conn_drop_async_message(conn);
4032
4033 spin_unlock_bh(&sess->conn_lock);
4034
4035 /*
4036 * If connection reinstatement is being performed on this connection,
4037 * up the connection reinstatement semaphore that is being blocked on
4038 * in iscsit_cause_connection_reinstatement().
4039 */
4040 spin_lock_bh(&conn->state_lock);
4041 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4042 spin_unlock_bh(&conn->state_lock);
4043 complete(&conn->conn_wait_comp);
4044 wait_for_completion(&conn->conn_post_wait_comp);
4045 spin_lock_bh(&conn->state_lock);
4046 }
4047
4048 /*
4049 * If connection reinstatement is being performed on this connection
4050 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4051 * connection wait rcfr semaphore that is being blocked on
4052 * an iscsit_connection_reinstatement_rcfr().
4053 */
4054 if (atomic_read(&conn->connection_wait_rcfr)) {
4055 spin_unlock_bh(&conn->state_lock);
4056 complete(&conn->conn_wait_rcfr_comp);
4057 wait_for_completion(&conn->conn_post_wait_comp);
4058 spin_lock_bh(&conn->state_lock);
4059 }
4060 atomic_set(&conn->connection_reinstatement, 1);
4061 spin_unlock_bh(&conn->state_lock);
4062
4063 /*
4064 * If any other processes are accessing this connection pointer we
4065 * must wait until they have completed.
4066 */
4067 iscsit_check_conn_usage_count(conn);
4068
4069 if (conn->conn_rx_hash.tfm)
4070 crypto_free_hash(conn->conn_rx_hash.tfm);
4071 if (conn->conn_tx_hash.tfm)
4072 crypto_free_hash(conn->conn_tx_hash.tfm);
4073
4074 if (conn->conn_cpumask)
4075 free_cpumask_var(conn->conn_cpumask);
4076
4077 kfree(conn->conn_ops);
4078 conn->conn_ops = NULL;
4079
4080 if (conn->sock) {
4081 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
4082 kfree(conn->sock->file);
4083 conn->sock->file = NULL;
4084 }
4085 sock_release(conn->sock);
4086 }
4087 conn->thread_set = NULL;
4088
4089 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4090 conn->conn_state = TARG_CONN_STATE_FREE;
4091 kfree(conn);
4092
4093 spin_lock_bh(&sess->conn_lock);
4094 atomic_dec(&sess->nconn);
4095 pr_debug("Decremented iSCSI connection count to %hu from node:"
4096 " %s\n", atomic_read(&sess->nconn),
4097 sess->sess_ops->InitiatorName);
4098 /*
4099 * Make sure that if one connection fails in an non ERL=2 iSCSI
4100 * Session that they all fail.
4101 */
4102 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4103 !atomic_read(&sess->session_logout))
4104 atomic_set(&sess->session_fall_back_to_erl0, 1);
4105
4106 /*
4107 * If this was not the last connection in the session, and we are
4108 * performing session reinstatement or falling back to ERL=0, call
4109 * iscsit_stop_session() without sleeping to shutdown the other
4110 * active connections.
4111 */
4112 if (atomic_read(&sess->nconn)) {
4113 if (!atomic_read(&sess->session_reinstatement) &&
4114 !atomic_read(&sess->session_fall_back_to_erl0)) {
4115 spin_unlock_bh(&sess->conn_lock);
4116 return 0;
4117 }
4118 if (!atomic_read(&sess->session_stop_active)) {
4119 atomic_set(&sess->session_stop_active, 1);
4120 spin_unlock_bh(&sess->conn_lock);
4121 iscsit_stop_session(sess, 0, 0);
4122 return 0;
4123 }
4124 spin_unlock_bh(&sess->conn_lock);
4125 return 0;
4126 }
4127
4128 /*
4129 * If this was the last connection in the session and one of the
4130 * following is occurring:
4131 *
4132 * Session Reinstatement is not being performed, and are falling back
4133 * to ERL=0 call iscsit_close_session().
4134 *
4135 * Session Logout was requested. iscsit_close_session() will be called
4136 * elsewhere.
4137 *
4138 * Session Continuation is not being performed, start the Time2Retain
4139 * handler and check if sleep_on_sess_wait_sem is active.
4140 */
4141 if (!atomic_read(&sess->session_reinstatement) &&
4142 atomic_read(&sess->session_fall_back_to_erl0)) {
4143 spin_unlock_bh(&sess->conn_lock);
4144 target_put_session(sess->se_sess);
4145
4146 return 0;
4147 } else if (atomic_read(&sess->session_logout)) {
4148 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4149 sess->session_state = TARG_SESS_STATE_FREE;
4150 spin_unlock_bh(&sess->conn_lock);
4151
4152 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4153 complete(&sess->session_wait_comp);
4154
4155 return 0;
4156 } else {
4157 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4158 sess->session_state = TARG_SESS_STATE_FAILED;
4159
4160 if (!atomic_read(&sess->session_continuation)) {
4161 spin_unlock_bh(&sess->conn_lock);
4162 iscsit_start_time2retain_handler(sess);
4163 } else
4164 spin_unlock_bh(&sess->conn_lock);
4165
4166 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4167 complete(&sess->session_wait_comp);
4168
4169 return 0;
4170 }
4171 spin_unlock_bh(&sess->conn_lock);
4172
4173 return 0;
4174 }
4175
4176 int iscsit_close_session(struct iscsi_session *sess)
4177 {
4178 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4179 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4180
4181 if (atomic_read(&sess->nconn)) {
4182 pr_err("%d connection(s) still exist for iSCSI session"
4183 " to %s\n", atomic_read(&sess->nconn),
4184 sess->sess_ops->InitiatorName);
4185 BUG();
4186 }
4187
4188 spin_lock_bh(&se_tpg->session_lock);
4189 atomic_set(&sess->session_logout, 1);
4190 atomic_set(&sess->session_reinstatement, 1);
4191 iscsit_stop_time2retain_timer(sess);
4192 spin_unlock_bh(&se_tpg->session_lock);
4193
4194 /*
4195 * transport_deregister_session_configfs() will clear the
4196 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4197 * can be setting it again with __transport_register_session() in
4198 * iscsi_post_login_handler() again after the iscsit_stop_session()
4199 * completes in iscsi_np context.
4200 */
4201 transport_deregister_session_configfs(sess->se_sess);
4202
4203 /*
4204 * If any other processes are accessing this session pointer we must
4205 * wait until they have completed. If we are in an interrupt (the
4206 * time2retain handler) and contain and active session usage count we
4207 * restart the timer and exit.
4208 */
4209 if (!in_interrupt()) {
4210 if (iscsit_check_session_usage_count(sess) == 1)
4211 iscsit_stop_session(sess, 1, 1);
4212 } else {
4213 if (iscsit_check_session_usage_count(sess) == 2) {
4214 atomic_set(&sess->session_logout, 0);
4215 iscsit_start_time2retain_handler(sess);
4216 return 0;
4217 }
4218 }
4219
4220 transport_deregister_session(sess->se_sess);
4221
4222 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4223 iscsit_free_connection_recovery_entires(sess);
4224
4225 iscsit_free_all_ooo_cmdsns(sess);
4226
4227 spin_lock_bh(&se_tpg->session_lock);
4228 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4229 sess->session_state = TARG_SESS_STATE_FREE;
4230 pr_debug("Released iSCSI session from node: %s\n",
4231 sess->sess_ops->InitiatorName);
4232 tpg->nsessions--;
4233 if (tpg->tpg_tiqn)
4234 tpg->tpg_tiqn->tiqn_nsessions--;
4235
4236 pr_debug("Decremented number of active iSCSI Sessions on"
4237 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4238
4239 spin_lock(&sess_idr_lock);
4240 idr_remove(&sess_idr, sess->session_index);
4241 spin_unlock(&sess_idr_lock);
4242
4243 kfree(sess->sess_ops);
4244 sess->sess_ops = NULL;
4245 spin_unlock_bh(&se_tpg->session_lock);
4246
4247 kfree(sess);
4248 return 0;
4249 }
4250
4251 static void iscsit_logout_post_handler_closesession(
4252 struct iscsi_conn *conn)
4253 {
4254 struct iscsi_session *sess = conn->sess;
4255
4256 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4257 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4258
4259 atomic_set(&conn->conn_logout_remove, 0);
4260 complete(&conn->conn_logout_comp);
4261
4262 iscsit_dec_conn_usage_count(conn);
4263 iscsit_stop_session(sess, 1, 1);
4264 iscsit_dec_session_usage_count(sess);
4265 target_put_session(sess->se_sess);
4266 }
4267
4268 static void iscsit_logout_post_handler_samecid(
4269 struct iscsi_conn *conn)
4270 {
4271 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4272 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4273
4274 atomic_set(&conn->conn_logout_remove, 0);
4275 complete(&conn->conn_logout_comp);
4276
4277 iscsit_cause_connection_reinstatement(conn, 1);
4278 iscsit_dec_conn_usage_count(conn);
4279 }
4280
4281 static void iscsit_logout_post_handler_diffcid(
4282 struct iscsi_conn *conn,
4283 u16 cid)
4284 {
4285 struct iscsi_conn *l_conn;
4286 struct iscsi_session *sess = conn->sess;
4287
4288 if (!sess)
4289 return;
4290
4291 spin_lock_bh(&sess->conn_lock);
4292 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4293 if (l_conn->cid == cid) {
4294 iscsit_inc_conn_usage_count(l_conn);
4295 break;
4296 }
4297 }
4298 spin_unlock_bh(&sess->conn_lock);
4299
4300 if (!l_conn)
4301 return;
4302
4303 if (l_conn->sock)
4304 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4305
4306 spin_lock_bh(&l_conn->state_lock);
4307 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4308 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4309 spin_unlock_bh(&l_conn->state_lock);
4310
4311 iscsit_cause_connection_reinstatement(l_conn, 1);
4312 iscsit_dec_conn_usage_count(l_conn);
4313 }
4314
4315 /*
4316 * Return of 0 causes the TX thread to restart.
4317 */
4318 static int iscsit_logout_post_handler(
4319 struct iscsi_cmd *cmd,
4320 struct iscsi_conn *conn)
4321 {
4322 int ret = 0;
4323
4324 switch (cmd->logout_reason) {
4325 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4326 switch (cmd->logout_response) {
4327 case ISCSI_LOGOUT_SUCCESS:
4328 case ISCSI_LOGOUT_CLEANUP_FAILED:
4329 default:
4330 iscsit_logout_post_handler_closesession(conn);
4331 break;
4332 }
4333 ret = 0;
4334 break;
4335 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4336 if (conn->cid == cmd->logout_cid) {
4337 switch (cmd->logout_response) {
4338 case ISCSI_LOGOUT_SUCCESS:
4339 case ISCSI_LOGOUT_CLEANUP_FAILED:
4340 default:
4341 iscsit_logout_post_handler_samecid(conn);
4342 break;
4343 }
4344 ret = 0;
4345 } else {
4346 switch (cmd->logout_response) {
4347 case ISCSI_LOGOUT_SUCCESS:
4348 iscsit_logout_post_handler_diffcid(conn,
4349 cmd->logout_cid);
4350 break;
4351 case ISCSI_LOGOUT_CID_NOT_FOUND:
4352 case ISCSI_LOGOUT_CLEANUP_FAILED:
4353 default:
4354 break;
4355 }
4356 ret = 1;
4357 }
4358 break;
4359 case ISCSI_LOGOUT_REASON_RECOVERY:
4360 switch (cmd->logout_response) {
4361 case ISCSI_LOGOUT_SUCCESS:
4362 case ISCSI_LOGOUT_CID_NOT_FOUND:
4363 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4364 case ISCSI_LOGOUT_CLEANUP_FAILED:
4365 default:
4366 break;
4367 }
4368 ret = 1;
4369 break;
4370 default:
4371 break;
4372
4373 }
4374 return ret;
4375 }
4376
4377 void iscsit_fail_session(struct iscsi_session *sess)
4378 {
4379 struct iscsi_conn *conn;
4380
4381 spin_lock_bh(&sess->conn_lock);
4382 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4383 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4384 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4385 }
4386 spin_unlock_bh(&sess->conn_lock);
4387
4388 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4389 sess->session_state = TARG_SESS_STATE_FAILED;
4390 }
4391
4392 int iscsit_free_session(struct iscsi_session *sess)
4393 {
4394 u16 conn_count = atomic_read(&sess->nconn);
4395 struct iscsi_conn *conn, *conn_tmp = NULL;
4396 int is_last;
4397
4398 spin_lock_bh(&sess->conn_lock);
4399 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4400
4401 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4402 conn_list) {
4403 if (conn_count == 0)
4404 break;
4405
4406 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4407 is_last = 1;
4408 } else {
4409 iscsit_inc_conn_usage_count(conn_tmp);
4410 is_last = 0;
4411 }
4412 iscsit_inc_conn_usage_count(conn);
4413
4414 spin_unlock_bh(&sess->conn_lock);
4415 iscsit_cause_connection_reinstatement(conn, 1);
4416 spin_lock_bh(&sess->conn_lock);
4417
4418 iscsit_dec_conn_usage_count(conn);
4419 if (is_last == 0)
4420 iscsit_dec_conn_usage_count(conn_tmp);
4421
4422 conn_count--;
4423 }
4424
4425 if (atomic_read(&sess->nconn)) {
4426 spin_unlock_bh(&sess->conn_lock);
4427 wait_for_completion(&sess->session_wait_comp);
4428 } else
4429 spin_unlock_bh(&sess->conn_lock);
4430
4431 target_put_session(sess->se_sess);
4432 return 0;
4433 }
4434
4435 void iscsit_stop_session(
4436 struct iscsi_session *sess,
4437 int session_sleep,
4438 int connection_sleep)
4439 {
4440 u16 conn_count = atomic_read(&sess->nconn);
4441 struct iscsi_conn *conn, *conn_tmp = NULL;
4442 int is_last;
4443
4444 spin_lock_bh(&sess->conn_lock);
4445 if (session_sleep)
4446 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4447
4448 if (connection_sleep) {
4449 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4450 conn_list) {
4451 if (conn_count == 0)
4452 break;
4453
4454 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4455 is_last = 1;
4456 } else {
4457 iscsit_inc_conn_usage_count(conn_tmp);
4458 is_last = 0;
4459 }
4460 iscsit_inc_conn_usage_count(conn);
4461
4462 spin_unlock_bh(&sess->conn_lock);
4463 iscsit_cause_connection_reinstatement(conn, 1);
4464 spin_lock_bh(&sess->conn_lock);
4465
4466 iscsit_dec_conn_usage_count(conn);
4467 if (is_last == 0)
4468 iscsit_dec_conn_usage_count(conn_tmp);
4469 conn_count--;
4470 }
4471 } else {
4472 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4473 iscsit_cause_connection_reinstatement(conn, 0);
4474 }
4475
4476 if (session_sleep && atomic_read(&sess->nconn)) {
4477 spin_unlock_bh(&sess->conn_lock);
4478 wait_for_completion(&sess->session_wait_comp);
4479 } else
4480 spin_unlock_bh(&sess->conn_lock);
4481 }
4482
4483 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4484 {
4485 struct iscsi_session *sess;
4486 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4487 struct se_session *se_sess, *se_sess_tmp;
4488 int session_count = 0;
4489
4490 spin_lock_bh(&se_tpg->session_lock);
4491 if (tpg->nsessions && !force) {
4492 spin_unlock_bh(&se_tpg->session_lock);
4493 return -1;
4494 }
4495
4496 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4497 sess_list) {
4498 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4499
4500 spin_lock(&sess->conn_lock);
4501 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4502 atomic_read(&sess->session_logout) ||
4503 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4504 spin_unlock(&sess->conn_lock);
4505 continue;
4506 }
4507 atomic_set(&sess->session_reinstatement, 1);
4508 spin_unlock(&sess->conn_lock);
4509 spin_unlock_bh(&se_tpg->session_lock);
4510
4511 iscsit_free_session(sess);
4512 spin_lock_bh(&se_tpg->session_lock);
4513
4514 session_count++;
4515 }
4516 spin_unlock_bh(&se_tpg->session_lock);
4517
4518 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4519 " Group: %hu\n", session_count, tpg->tpgt);
4520 return 0;
4521 }
4522
4523 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4524 MODULE_VERSION("4.1.x");
4525 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4526 MODULE_LICENSE("GPL");
4527
4528 module_init(iscsi_target_init_module);
4529 module_exit(iscsi_target_cleanup_module);
Linux kernel - Deliverables
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