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Adding support for MOXA ART SoC. Testing port of linux-2.6.32.60-moxart.
[linux-3.6.7-moxart.git] / drivers / target / iscsi / iscsi_target.c
blob6b6f50a3e013e03d5b613156b23f5cf827c2760a
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 sock_release(np->np_socket);
434 return 0;
435 }
436
437 int iscsit_del_np(struct iscsi_np *np)
438 {
439 spin_lock_bh(&np->np_thread_lock);
440 np->np_exports--;
441 if (np->np_exports) {
442 spin_unlock_bh(&np->np_thread_lock);
443 return 0;
444 }
445 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
446 spin_unlock_bh(&np->np_thread_lock);
447
448 if (np->np_thread) {
449 /*
450 * We need to send the signal to wakeup Linux/Net
451 * which may be sleeping in sock_accept()..
452 */
453 send_sig(SIGINT, np->np_thread, 1);
454 kthread_stop(np->np_thread);
455 }
456 iscsit_del_np_comm(np);
457
458 spin_lock_bh(&np_lock);
459 list_del(&np->np_list);
460 spin_unlock_bh(&np_lock);
461
462 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
463 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
464 "TCP" : "SCTP");
465
466 kfree(np);
467 return 0;
468 }
469
470 static int __init iscsi_target_init_module(void)
471 {
472 int ret = 0;
473
474 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
475
476 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
477 if (!iscsit_global) {
478 pr_err("Unable to allocate memory for iscsit_global\n");
479 return -1;
480 }
481 mutex_init(&auth_id_lock);
482 spin_lock_init(&sess_idr_lock);
483 idr_init(&tiqn_idr);
484 idr_init(&sess_idr);
485
486 ret = iscsi_target_register_configfs();
487 if (ret < 0)
488 goto out;
489
490 ret = iscsi_thread_set_init();
491 if (ret < 0)
492 goto configfs_out;
493
494 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
495 TARGET_THREAD_SET_COUNT) {
496 pr_err("iscsi_allocate_thread_sets() returned"
497 " unexpected value!\n");
498 goto ts_out1;
499 }
500
501 lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
502 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
503 0, NULL);
504 if (!lio_cmd_cache) {
505 pr_err("Unable to kmem_cache_create() for"
506 " lio_cmd_cache\n");
507 goto ts_out2;
508 }
509
510 lio_qr_cache = kmem_cache_create("lio_qr_cache",
511 sizeof(struct iscsi_queue_req),
512 __alignof__(struct iscsi_queue_req), 0, NULL);
513 if (!lio_qr_cache) {
514 pr_err("nable to kmem_cache_create() for"
515 " lio_qr_cache\n");
516 goto cmd_out;
517 }
518
519 lio_dr_cache = kmem_cache_create("lio_dr_cache",
520 sizeof(struct iscsi_datain_req),
521 __alignof__(struct iscsi_datain_req), 0, NULL);
522 if (!lio_dr_cache) {
523 pr_err("Unable to kmem_cache_create() for"
524 " lio_dr_cache\n");
525 goto qr_out;
526 }
527
528 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
529 sizeof(struct iscsi_ooo_cmdsn),
530 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
531 if (!lio_ooo_cache) {
532 pr_err("Unable to kmem_cache_create() for"
533 " lio_ooo_cache\n");
534 goto dr_out;
535 }
536
537 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
538 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
539 0, NULL);
540 if (!lio_r2t_cache) {
541 pr_err("Unable to kmem_cache_create() for"
542 " lio_r2t_cache\n");
543 goto ooo_out;
544 }
545
546 if (iscsit_load_discovery_tpg() < 0)
547 goto r2t_out;
548
549 return ret;
550 r2t_out:
551 kmem_cache_destroy(lio_r2t_cache);
552 ooo_out:
553 kmem_cache_destroy(lio_ooo_cache);
554 dr_out:
555 kmem_cache_destroy(lio_dr_cache);
556 qr_out:
557 kmem_cache_destroy(lio_qr_cache);
558 cmd_out:
559 kmem_cache_destroy(lio_cmd_cache);
560 ts_out2:
561 iscsi_deallocate_thread_sets();
562 ts_out1:
563 iscsi_thread_set_free();
564 configfs_out:
565 iscsi_target_deregister_configfs();
566 out:
567 kfree(iscsit_global);
568 return -ENOMEM;
569 }
570
571 static void __exit iscsi_target_cleanup_module(void)
572 {
573 iscsi_deallocate_thread_sets();
574 iscsi_thread_set_free();
575 iscsit_release_discovery_tpg();
576 kmem_cache_destroy(lio_cmd_cache);
577 kmem_cache_destroy(lio_qr_cache);
578 kmem_cache_destroy(lio_dr_cache);
579 kmem_cache_destroy(lio_ooo_cache);
580 kmem_cache_destroy(lio_r2t_cache);
581
582 iscsi_target_deregister_configfs();
583
584 kfree(iscsit_global);
585 }
586
587 static int iscsit_add_reject(
588 u8 reason,
589 int fail_conn,
590 unsigned char *buf,
591 struct iscsi_conn *conn)
592 {
593 struct iscsi_cmd *cmd;
594 struct iscsi_reject *hdr;
595 int ret;
596
597 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
598 if (!cmd)
599 return -1;
600
601 cmd->iscsi_opcode = ISCSI_OP_REJECT;
602 if (fail_conn)
603 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
604
605 hdr = (struct iscsi_reject *) cmd->pdu;
606 hdr->reason = reason;
607
608 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
609 if (!cmd->buf_ptr) {
610 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
611 iscsit_release_cmd(cmd);
612 return -1;
613 }
614
615 spin_lock_bh(&conn->cmd_lock);
616 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
617 spin_unlock_bh(&conn->cmd_lock);
618
619 cmd->i_state = ISTATE_SEND_REJECT;
620 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
621
622 ret = wait_for_completion_interruptible(&cmd->reject_comp);
623 if (ret != 0)
624 return -1;
625
626 return (!fail_conn) ? 0 : -1;
627 }
628
629 int iscsit_add_reject_from_cmd(
630 u8 reason,
631 int fail_conn,
632 int add_to_conn,
633 unsigned char *buf,
634 struct iscsi_cmd *cmd)
635 {
636 struct iscsi_conn *conn;
637 struct iscsi_reject *hdr;
638 int ret;
639
640 if (!cmd->conn) {
641 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
642 cmd->init_task_tag);
643 return -1;
644 }
645 conn = cmd->conn;
646
647 cmd->iscsi_opcode = ISCSI_OP_REJECT;
648 if (fail_conn)
649 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
650
651 hdr = (struct iscsi_reject *) cmd->pdu;
652 hdr->reason = reason;
653
654 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
655 if (!cmd->buf_ptr) {
656 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
657 iscsit_release_cmd(cmd);
658 return -1;
659 }
660
661 if (add_to_conn) {
662 spin_lock_bh(&conn->cmd_lock);
663 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
664 spin_unlock_bh(&conn->cmd_lock);
665 }
666
667 cmd->i_state = ISTATE_SEND_REJECT;
668 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
669
670 ret = wait_for_completion_interruptible(&cmd->reject_comp);
671 if (ret != 0)
672 return -1;
673
674 return (!fail_conn) ? 0 : -1;
675 }
676
677 /*
678 * Map some portion of the allocated scatterlist to an iovec, suitable for
679 * kernel sockets to copy data in/out.
680 */
681 static int iscsit_map_iovec(
682 struct iscsi_cmd *cmd,
683 struct kvec *iov,
684 u32 data_offset,
685 u32 data_length)
686 {
687 u32 i = 0;
688 struct scatterlist *sg;
689 unsigned int page_off;
690
691 /*
692 * We know each entry in t_data_sg contains a page.
693 */
694 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
695 page_off = (data_offset % PAGE_SIZE);
696
697 cmd->first_data_sg = sg;
698 cmd->first_data_sg_off = page_off;
699
700 while (data_length) {
701 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
702
703 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
704 iov[i].iov_len = cur_len;
705
706 data_length -= cur_len;
707 page_off = 0;
708 sg = sg_next(sg);
709 i++;
710 }
711
712 cmd->kmapped_nents = i;
713
714 return i;
715 }
716
717 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
718 {
719 u32 i;
720 struct scatterlist *sg;
721
722 sg = cmd->first_data_sg;
723
724 for (i = 0; i < cmd->kmapped_nents; i++)
725 kunmap(sg_page(&sg[i]));
726 }
727
728 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
729 {
730 struct iscsi_cmd *cmd;
731
732 conn->exp_statsn = exp_statsn;
733
734 spin_lock_bh(&conn->cmd_lock);
735 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
736 spin_lock(&cmd->istate_lock);
737 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
738 (cmd->stat_sn < exp_statsn)) {
739 cmd->i_state = ISTATE_REMOVE;
740 spin_unlock(&cmd->istate_lock);
741 iscsit_add_cmd_to_immediate_queue(cmd, conn,
742 cmd->i_state);
743 continue;
744 }
745 spin_unlock(&cmd->istate_lock);
746 }
747 spin_unlock_bh(&conn->cmd_lock);
748 }
749
750 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
751 {
752 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
753
754 iov_count += ISCSI_IOV_DATA_BUFFER;
755
756 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
757 if (!cmd->iov_data) {
758 pr_err("Unable to allocate cmd->iov_data\n");
759 return -ENOMEM;
760 }
761
762 cmd->orig_iov_data_count = iov_count;
763 return 0;
764 }
765
766 static int iscsit_handle_scsi_cmd(
767 struct iscsi_conn *conn,
768 unsigned char *buf)
769 {
770 int data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
771 int dump_immediate_data = 0, send_check_condition = 0, payload_length;
772 struct iscsi_cmd *cmd = NULL;
773 struct iscsi_scsi_req *hdr;
774 int iscsi_task_attr;
775 int sam_task_attr;
776
777 spin_lock_bh(&conn->sess->session_stats_lock);
778 conn->sess->cmd_pdus++;
779 if (conn->sess->se_sess->se_node_acl) {
780 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
781 conn->sess->se_sess->se_node_acl->num_cmds++;
782 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
783 }
784 spin_unlock_bh(&conn->sess->session_stats_lock);
785
786 hdr = (struct iscsi_scsi_req *) buf;
787 payload_length = ntoh24(hdr->dlength);
788 hdr->itt = be32_to_cpu(hdr->itt);
789 hdr->data_length = be32_to_cpu(hdr->data_length);
790 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
791 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
792
793 /* FIXME; Add checks for AdditionalHeaderSegment */
794
795 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
796 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
797 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
798 " not set. Bad iSCSI Initiator.\n");
799 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
800 buf, conn);
801 }
802
803 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
804 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
805 /*
806 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
807 * that adds support for RESERVE/RELEASE. There is a bug
808 * add with this new functionality that sets R/W bits when
809 * neither CDB carries any READ or WRITE datapayloads.
810 */
811 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
812 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
813 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
814 goto done;
815 }
816
817 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
818 " set when Expected Data Transfer Length is 0 for"
819 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
820 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
821 buf, conn);
822 }
823 done:
824
825 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
826 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
827 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
828 " MUST be set if Expected Data Transfer Length is not 0."
829 " Bad iSCSI Initiator\n");
830 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
831 buf, conn);
832 }
833
834 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
835 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
836 pr_err("Bidirectional operations not supported!\n");
837 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
838 buf, conn);
839 }
840
841 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
842 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
843 " Scsi Command PDU.\n");
844 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
845 buf, conn);
846 }
847
848 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
849 pr_err("ImmediateData=No but DataSegmentLength=%u,"
850 " protocol error.\n", payload_length);
851 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
852 buf, conn);
853 }
854
855 if ((hdr->data_length == payload_length) &&
856 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
857 pr_err("Expected Data Transfer Length and Length of"
858 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
859 " bit is not set protocol error\n");
860 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
861 buf, conn);
862 }
863
864 if (payload_length > hdr->data_length) {
865 pr_err("DataSegmentLength: %u is greater than"
866 " EDTL: %u, protocol error.\n", payload_length,
867 hdr->data_length);
868 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
869 buf, conn);
870 }
871
872 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
873 pr_err("DataSegmentLength: %u is greater than"
874 " MaxRecvDataSegmentLength: %u, protocol error.\n",
875 payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
876 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
877 buf, conn);
878 }
879
880 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
881 pr_err("DataSegmentLength: %u is greater than"
882 " FirstBurstLength: %u, protocol error.\n",
883 payload_length, conn->sess->sess_ops->FirstBurstLength);
884 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
885 buf, conn);
886 }
887
888 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
889 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
890 DMA_NONE;
891
892 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
893 if (!cmd)
894 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
895 buf, conn);
896
897 cmd->data_direction = data_direction;
898 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
899 /*
900 * Figure out the SAM Task Attribute for the incoming SCSI CDB
901 */
902 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
903 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
904 sam_task_attr = MSG_SIMPLE_TAG;
905 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
906 sam_task_attr = MSG_ORDERED_TAG;
907 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
908 sam_task_attr = MSG_HEAD_TAG;
909 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
910 sam_task_attr = MSG_ACA_TAG;
911 else {
912 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
913 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
914 sam_task_attr = MSG_SIMPLE_TAG;
915 }
916
917 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
918 cmd->i_state = ISTATE_NEW_CMD;
919 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
920 cmd->immediate_data = (payload_length) ? 1 : 0;
921 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
922 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
923 if (cmd->unsolicited_data)
924 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
925
926 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
927 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
928 spin_lock_bh(&conn->sess->ttt_lock);
929 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
930 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
931 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
932 spin_unlock_bh(&conn->sess->ttt_lock);
933 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
934 cmd->targ_xfer_tag = 0xFFFFFFFF;
935 cmd->cmd_sn = hdr->cmdsn;
936 cmd->exp_stat_sn = hdr->exp_statsn;
937 cmd->first_burst_len = payload_length;
938
939 if (cmd->data_direction == DMA_FROM_DEVICE) {
940 struct iscsi_datain_req *dr;
941
942 dr = iscsit_allocate_datain_req();
943 if (!dr)
944 return iscsit_add_reject_from_cmd(
945 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
946 1, 1, buf, cmd);
947
948 iscsit_attach_datain_req(cmd, dr);
949 }
950
951 /*
952 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
953 */
954 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
955 conn->sess->se_sess, hdr->data_length, cmd->data_direction,
956 sam_task_attr, &cmd->sense_buffer[0]);
957
958 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
959 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
960 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
961
962 /*
963 * The CDB is going to an se_device_t.
964 */
965 ret = transport_lookup_cmd_lun(&cmd->se_cmd,
966 scsilun_to_int(&hdr->lun));
967 if (ret < 0) {
968 if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
969 pr_debug("Responding to non-acl'ed,"
970 " non-existent or non-exported iSCSI LUN:"
971 " 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
972 }
973 send_check_condition = 1;
974 goto attach_cmd;
975 }
976
977 transport_ret = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
978 if (transport_ret == -ENOMEM) {
979 return iscsit_add_reject_from_cmd(
980 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
981 1, 1, buf, cmd);
982 } else if (transport_ret < 0) {
983 /*
984 * Unsupported SAM Opcode. CHECK_CONDITION will be sent
985 * in iscsit_execute_cmd() during the CmdSN OOO Execution
986 * Mechinism.
987 */
988 send_check_condition = 1;
989 } else {
990 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0)
991 return iscsit_add_reject_from_cmd(
992 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
993 1, 1, buf, cmd);
994 }
995
996 attach_cmd:
997 spin_lock_bh(&conn->cmd_lock);
998 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
999 spin_unlock_bh(&conn->cmd_lock);
1000 /*
1001 * Check if we need to delay processing because of ALUA
1002 * Active/NonOptimized primary access state..
1003 */
1004 core_alua_check_nonop_delay(&cmd->se_cmd);
1005
1006 ret = iscsit_allocate_iovecs(cmd);
1007 if (ret < 0)
1008 return iscsit_add_reject_from_cmd(
1009 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1010 1, 0, buf, cmd);
1011 /*
1012 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1013 * the Immediate Bit is not set, and no Immediate
1014 * Data is attached.
1015 *
1016 * A PDU/CmdSN carrying Immediate Data can only
1017 * be processed after the DataCRC has passed.
1018 * If the DataCRC fails, the CmdSN MUST NOT
1019 * be acknowledged. (See below)
1020 */
1021 if (!cmd->immediate_data) {
1022 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1023 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1024 return 0;
1025 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1026 return iscsit_add_reject_from_cmd(
1027 ISCSI_REASON_PROTOCOL_ERROR,
1028 1, 0, buf, cmd);
1029 }
1030
1031 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1032
1033 /*
1034 * If no Immediate Data is attached, it's OK to return now.
1035 */
1036 if (!cmd->immediate_data) {
1037 if (send_check_condition)
1038 return 0;
1039
1040 if (cmd->unsolicited_data) {
1041 iscsit_set_dataout_sequence_values(cmd);
1042
1043 spin_lock_bh(&cmd->dataout_timeout_lock);
1044 iscsit_start_dataout_timer(cmd, cmd->conn);
1045 spin_unlock_bh(&cmd->dataout_timeout_lock);
1046 }
1047
1048 return 0;
1049 }
1050
1051 /*
1052 * Early CHECK_CONDITIONs never make it to the transport processing
1053 * thread. They are processed in CmdSN order by
1054 * iscsit_check_received_cmdsn() below.
1055 */
1056 if (send_check_condition) {
1057 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1058 dump_immediate_data = 1;
1059 goto after_immediate_data;
1060 }
1061 /*
1062 * Call directly into transport_generic_new_cmd() to perform
1063 * the backend memory allocation.
1064 */
1065 ret = transport_generic_new_cmd(&cmd->se_cmd);
1066 if (ret < 0) {
1067 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1068 dump_immediate_data = 1;
1069 goto after_immediate_data;
1070 }
1071
1072 immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1073 after_immediate_data:
1074 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1075 /*
1076 * A PDU/CmdSN carrying Immediate Data passed
1077 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1078 * Immediate Bit is not set.
1079 */
1080 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1081 /*
1082 * Special case for Unsupported SAM WRITE Opcodes
1083 * and ImmediateData=Yes.
1084 */
1085 if (dump_immediate_data) {
1086 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1087 return -1;
1088 } else if (cmd->unsolicited_data) {
1089 iscsit_set_dataout_sequence_values(cmd);
1090
1091 spin_lock_bh(&cmd->dataout_timeout_lock);
1092 iscsit_start_dataout_timer(cmd, cmd->conn);
1093 spin_unlock_bh(&cmd->dataout_timeout_lock);
1094 }
1095
1096 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1097 return iscsit_add_reject_from_cmd(
1098 ISCSI_REASON_PROTOCOL_ERROR,
1099 1, 0, buf, cmd);
1100
1101 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1102 /*
1103 * Immediate Data failed DataCRC and ERL>=1,
1104 * silently drop this PDU and let the initiator
1105 * plug the CmdSN gap.
1106 *
1107 * FIXME: Send Unsolicited NOPIN with reserved
1108 * TTT here to help the initiator figure out
1109 * the missing CmdSN, although they should be
1110 * intelligent enough to determine the missing
1111 * CmdSN and issue a retry to plug the sequence.
1112 */
1113 cmd->i_state = ISTATE_REMOVE;
1114 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1115 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1116 return -1;
1117
1118 return 0;
1119 }
1120
1121 static u32 iscsit_do_crypto_hash_sg(
1122 struct hash_desc *hash,
1123 struct iscsi_cmd *cmd,
1124 u32 data_offset,
1125 u32 data_length,
1126 u32 padding,
1127 u8 *pad_bytes)
1128 {
1129 u32 data_crc;
1130 u32 i;
1131 struct scatterlist *sg;
1132 unsigned int page_off;
1133
1134 crypto_hash_init(hash);
1135
1136 sg = cmd->first_data_sg;
1137 page_off = cmd->first_data_sg_off;
1138
1139 i = 0;
1140 while (data_length) {
1141 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1142
1143 crypto_hash_update(hash, &sg[i], cur_len);
1144
1145 data_length -= cur_len;
1146 page_off = 0;
1147 i++;
1148 }
1149
1150 if (padding) {
1151 struct scatterlist pad_sg;
1152
1153 sg_init_one(&pad_sg, pad_bytes, padding);
1154 crypto_hash_update(hash, &pad_sg, padding);
1155 }
1156 crypto_hash_final(hash, (u8 *) &data_crc);
1157
1158 return data_crc;
1159 }
1160
1161 static void iscsit_do_crypto_hash_buf(
1162 struct hash_desc *hash,
1163 unsigned char *buf,
1164 u32 payload_length,
1165 u32 padding,
1166 u8 *pad_bytes,
1167 u8 *data_crc)
1168 {
1169 struct scatterlist sg;
1170
1171 crypto_hash_init(hash);
1172
1173 sg_init_one(&sg, buf, payload_length);
1174 crypto_hash_update(hash, &sg, payload_length);
1175
1176 if (padding) {
1177 sg_init_one(&sg, pad_bytes, padding);
1178 crypto_hash_update(hash, &sg, padding);
1179 }
1180 crypto_hash_final(hash, data_crc);
1181 }
1182
1183 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1184 {
1185 int iov_ret, ooo_cmdsn = 0, ret;
1186 u8 data_crc_failed = 0;
1187 u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1188 u32 rx_size = 0, payload_length;
1189 struct iscsi_cmd *cmd = NULL;
1190 struct se_cmd *se_cmd;
1191 struct iscsi_data *hdr;
1192 struct kvec *iov;
1193 unsigned long flags;
1194
1195 hdr = (struct iscsi_data *) buf;
1196 payload_length = ntoh24(hdr->dlength);
1197 hdr->itt = be32_to_cpu(hdr->itt);
1198 hdr->ttt = be32_to_cpu(hdr->ttt);
1199 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1200 hdr->datasn = be32_to_cpu(hdr->datasn);
1201 hdr->offset = be32_to_cpu(hdr->offset);
1202
1203 if (!payload_length) {
1204 pr_err("DataOUT payload is ZERO, protocol error.\n");
1205 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1206 buf, conn);
1207 }
1208
1209 /* iSCSI write */
1210 spin_lock_bh(&conn->sess->session_stats_lock);
1211 conn->sess->rx_data_octets += payload_length;
1212 if (conn->sess->se_sess->se_node_acl) {
1213 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1214 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1215 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1216 }
1217 spin_unlock_bh(&conn->sess->session_stats_lock);
1218
1219 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1220 pr_err("DataSegmentLength: %u is greater than"
1221 " MaxRecvDataSegmentLength: %u\n", payload_length,
1222 conn->conn_ops->MaxRecvDataSegmentLength);
1223 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1224 buf, conn);
1225 }
1226
1227 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1228 payload_length);
1229 if (!cmd)
1230 return 0;
1231
1232 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1233 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1234 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1235 payload_length, conn->cid);
1236
1237 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1238 pr_err("Command ITT: 0x%08x received DataOUT after"
1239 " last DataOUT received, dumping payload\n",
1240 cmd->init_task_tag);
1241 return iscsit_dump_data_payload(conn, payload_length, 1);
1242 }
1243
1244 if (cmd->data_direction != DMA_TO_DEVICE) {
1245 pr_err("Command ITT: 0x%08x received DataOUT for a"
1246 " NON-WRITE command.\n", cmd->init_task_tag);
1247 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1248 1, 0, buf, cmd);
1249 }
1250 se_cmd = &cmd->se_cmd;
1251 iscsit_mod_dataout_timer(cmd);
1252
1253 if ((hdr->offset + payload_length) > cmd->se_cmd.data_length) {
1254 pr_err("DataOut Offset: %u, Length %u greater than"
1255 " iSCSI Command EDTL %u, protocol error.\n",
1256 hdr->offset, payload_length, cmd->se_cmd.data_length);
1257 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1258 1, 0, buf, cmd);
1259 }
1260
1261 if (cmd->unsolicited_data) {
1262 int dump_unsolicited_data = 0;
1263
1264 if (conn->sess->sess_ops->InitialR2T) {
1265 pr_err("Received unexpected unsolicited data"
1266 " while InitialR2T=Yes, protocol error.\n");
1267 transport_send_check_condition_and_sense(&cmd->se_cmd,
1268 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1269 return -1;
1270 }
1271 /*
1272 * Special case for dealing with Unsolicited DataOUT
1273 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1274 * failures;
1275 */
1276
1277 /* Something's amiss if we're not in WRITE_PENDING state... */
1278 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1279 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1280 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1281
1282 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1283 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1284 (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION))
1285 dump_unsolicited_data = 1;
1286 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1287
1288 if (dump_unsolicited_data) {
1289 /*
1290 * Check if a delayed TASK_ABORTED status needs to
1291 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1292 * received with the unsolicitied data out.
1293 */
1294 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1295 iscsit_stop_dataout_timer(cmd);
1296
1297 transport_check_aborted_status(se_cmd,
1298 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1299 return iscsit_dump_data_payload(conn, payload_length, 1);
1300 }
1301 } else {
1302 /*
1303 * For the normal solicited data path:
1304 *
1305 * Check for a delayed TASK_ABORTED status and dump any
1306 * incoming data out payload if one exists. Also, when the
1307 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1308 * data out sequence, we decrement outstanding_r2ts. Once
1309 * outstanding_r2ts reaches zero, go ahead and send the delayed
1310 * TASK_ABORTED status.
1311 */
1312 if (se_cmd->transport_state & CMD_T_ABORTED) {
1313 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1314 if (--cmd->outstanding_r2ts < 1) {
1315 iscsit_stop_dataout_timer(cmd);
1316 transport_check_aborted_status(
1317 se_cmd, 1);
1318 }
1319
1320 return iscsit_dump_data_payload(conn, payload_length, 1);
1321 }
1322 }
1323 /*
1324 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1325 * within-command recovery checks before receiving the payload.
1326 */
1327 ret = iscsit_check_pre_dataout(cmd, buf);
1328 if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1329 return 0;
1330 else if (ret == DATAOUT_CANNOT_RECOVER)
1331 return -1;
1332
1333 rx_size += payload_length;
1334 iov = &cmd->iov_data[0];
1335
1336 iov_ret = iscsit_map_iovec(cmd, iov, hdr->offset, payload_length);
1337 if (iov_ret < 0)
1338 return -1;
1339
1340 iov_count += iov_ret;
1341
1342 padding = ((-payload_length) & 3);
1343 if (padding != 0) {
1344 iov[iov_count].iov_base = cmd->pad_bytes;
1345 iov[iov_count++].iov_len = padding;
1346 rx_size += padding;
1347 pr_debug("Receiving %u padding bytes.\n", padding);
1348 }
1349
1350 if (conn->conn_ops->DataDigest) {
1351 iov[iov_count].iov_base = &checksum;
1352 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1353 rx_size += ISCSI_CRC_LEN;
1354 }
1355
1356 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1357
1358 iscsit_unmap_iovec(cmd);
1359
1360 if (rx_got != rx_size)
1361 return -1;
1362
1363 if (conn->conn_ops->DataDigest) {
1364 u32 data_crc;
1365
1366 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1367 hdr->offset, payload_length, padding,
1368 cmd->pad_bytes);
1369
1370 if (checksum != data_crc) {
1371 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1372 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1373 " does not match computed 0x%08x\n",
1374 hdr->itt, hdr->offset, payload_length,
1375 hdr->datasn, checksum, data_crc);
1376 data_crc_failed = 1;
1377 } else {
1378 pr_debug("Got CRC32C DataDigest 0x%08x for"
1379 " %u bytes of Data Out\n", checksum,
1380 payload_length);
1381 }
1382 }
1383 /*
1384 * Increment post receive data and CRC values or perform
1385 * within-command recovery.
1386 */
1387 ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1388 if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1389 return 0;
1390 else if (ret == DATAOUT_SEND_R2T) {
1391 iscsit_set_dataout_sequence_values(cmd);
1392 iscsit_build_r2ts_for_cmd(cmd, conn, false);
1393 } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1394 /*
1395 * Handle extra special case for out of order
1396 * Unsolicited Data Out.
1397 */
1398 spin_lock_bh(&cmd->istate_lock);
1399 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1400 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1401 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1402 spin_unlock_bh(&cmd->istate_lock);
1403
1404 iscsit_stop_dataout_timer(cmd);
1405 if (ooo_cmdsn)
1406 return 0;
1407 target_execute_cmd(&cmd->se_cmd);
1408 return 0;
1409 } else /* DATAOUT_CANNOT_RECOVER */
1410 return -1;
1411
1412 return 0;
1413 }
1414
1415 static int iscsit_handle_nop_out(
1416 struct iscsi_conn *conn,
1417 unsigned char *buf)
1418 {
1419 unsigned char *ping_data = NULL;
1420 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1421 u32 checksum, data_crc, padding = 0, payload_length;
1422 struct iscsi_cmd *cmd = NULL;
1423 struct kvec *iov = NULL;
1424 struct iscsi_nopout *hdr;
1425
1426 hdr = (struct iscsi_nopout *) buf;
1427 payload_length = ntoh24(hdr->dlength);
1428 hdr->itt = be32_to_cpu(hdr->itt);
1429 hdr->ttt = be32_to_cpu(hdr->ttt);
1430 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1431 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1432
1433 if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1434 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1435 " not set, protocol error.\n");
1436 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1437 buf, conn);
1438 }
1439
1440 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1441 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1442 " greater than MaxRecvDataSegmentLength: %u, protocol"
1443 " error.\n", payload_length,
1444 conn->conn_ops->MaxRecvDataSegmentLength);
1445 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1446 buf, conn);
1447 }
1448
1449 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1450 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1451 (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
1452 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1453 payload_length);
1454 /*
1455 * This is not a response to a Unsolicited NopIN, which means
1456 * it can either be a NOPOUT ping request (with a valid ITT),
1457 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1458 * Either way, make sure we allocate an struct iscsi_cmd, as both
1459 * can contain ping data.
1460 */
1461 if (hdr->ttt == 0xFFFFFFFF) {
1462 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1463 if (!cmd)
1464 return iscsit_add_reject(
1465 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1466 1, buf, conn);
1467
1468 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1469 cmd->i_state = ISTATE_SEND_NOPIN;
1470 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1471 1 : 0);
1472 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1473 cmd->targ_xfer_tag = 0xFFFFFFFF;
1474 cmd->cmd_sn = hdr->cmdsn;
1475 cmd->exp_stat_sn = hdr->exp_statsn;
1476 cmd->data_direction = DMA_NONE;
1477 }
1478
1479 if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
1480 rx_size = payload_length;
1481 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1482 if (!ping_data) {
1483 pr_err("Unable to allocate memory for"
1484 " NOPOUT ping data.\n");
1485 ret = -1;
1486 goto out;
1487 }
1488
1489 iov = &cmd->iov_misc[0];
1490 iov[niov].iov_base = ping_data;
1491 iov[niov++].iov_len = payload_length;
1492
1493 padding = ((-payload_length) & 3);
1494 if (padding != 0) {
1495 pr_debug("Receiving %u additional bytes"
1496 " for padding.\n", padding);
1497 iov[niov].iov_base = &cmd->pad_bytes;
1498 iov[niov++].iov_len = padding;
1499 rx_size += padding;
1500 }
1501 if (conn->conn_ops->DataDigest) {
1502 iov[niov].iov_base = &checksum;
1503 iov[niov++].iov_len = ISCSI_CRC_LEN;
1504 rx_size += ISCSI_CRC_LEN;
1505 }
1506
1507 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1508 if (rx_got != rx_size) {
1509 ret = -1;
1510 goto out;
1511 }
1512
1513 if (conn->conn_ops->DataDigest) {
1514 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1515 ping_data, payload_length,
1516 padding, cmd->pad_bytes,
1517 (u8 *)&data_crc);
1518
1519 if (checksum != data_crc) {
1520 pr_err("Ping data CRC32C DataDigest"
1521 " 0x%08x does not match computed 0x%08x\n",
1522 checksum, data_crc);
1523 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1524 pr_err("Unable to recover from"
1525 " NOPOUT Ping DataCRC failure while in"
1526 " ERL=0.\n");
1527 ret = -1;
1528 goto out;
1529 } else {
1530 /*
1531 * Silently drop this PDU and let the
1532 * initiator plug the CmdSN gap.
1533 */
1534 pr_debug("Dropping NOPOUT"
1535 " Command CmdSN: 0x%08x due to"
1536 " DataCRC error.\n", hdr->cmdsn);
1537 ret = 0;
1538 goto out;
1539 }
1540 } else {
1541 pr_debug("Got CRC32C DataDigest"
1542 " 0x%08x for %u bytes of ping data.\n",
1543 checksum, payload_length);
1544 }
1545 }
1546
1547 ping_data[payload_length] = '\0';
1548 /*
1549 * Attach ping data to struct iscsi_cmd->buf_ptr.
1550 */
1551 cmd->buf_ptr = ping_data;
1552 cmd->buf_ptr_size = payload_length;
1553
1554 pr_debug("Got %u bytes of NOPOUT ping"
1555 " data.\n", payload_length);
1556 pr_debug("Ping Data: \"%s\"\n", ping_data);
1557 }
1558
1559 if (hdr->itt != 0xFFFFFFFF) {
1560 if (!cmd) {
1561 pr_err("Checking CmdSN for NOPOUT,"
1562 " but cmd is NULL!\n");
1563 return -1;
1564 }
1565 /*
1566 * Initiator is expecting a NopIN ping reply,
1567 */
1568 spin_lock_bh(&conn->cmd_lock);
1569 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1570 spin_unlock_bh(&conn->cmd_lock);
1571
1572 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1573
1574 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1575 iscsit_add_cmd_to_response_queue(cmd, conn,
1576 cmd->i_state);
1577 return 0;
1578 }
1579
1580 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1581 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1582 ret = 0;
1583 goto ping_out;
1584 }
1585 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1586 return iscsit_add_reject_from_cmd(
1587 ISCSI_REASON_PROTOCOL_ERROR,
1588 1, 0, buf, cmd);
1589
1590 return 0;
1591 }
1592
1593 if (hdr->ttt != 0xFFFFFFFF) {
1594 /*
1595 * This was a response to a unsolicited NOPIN ping.
1596 */
1597 cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
1598 if (!cmd)
1599 return -1;
1600
1601 iscsit_stop_nopin_response_timer(conn);
1602
1603 cmd->i_state = ISTATE_REMOVE;
1604 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1605 iscsit_start_nopin_timer(conn);
1606 } else {
1607 /*
1608 * Initiator is not expecting a NOPIN is response.
1609 * Just ignore for now.
1610 *
1611 * iSCSI v19-91 10.18
1612 * "A NOP-OUT may also be used to confirm a changed
1613 * ExpStatSN if another PDU will not be available
1614 * for a long time."
1615 */
1616 ret = 0;
1617 goto out;
1618 }
1619
1620 return 0;
1621 out:
1622 if (cmd)
1623 iscsit_release_cmd(cmd);
1624 ping_out:
1625 kfree(ping_data);
1626 return ret;
1627 }
1628
1629 static int iscsit_handle_task_mgt_cmd(
1630 struct iscsi_conn *conn,
1631 unsigned char *buf)
1632 {
1633 struct iscsi_cmd *cmd;
1634 struct se_tmr_req *se_tmr;
1635 struct iscsi_tmr_req *tmr_req;
1636 struct iscsi_tm *hdr;
1637 int out_of_order_cmdsn = 0;
1638 int ret;
1639 u8 function;
1640
1641 hdr = (struct iscsi_tm *) buf;
1642 hdr->itt = be32_to_cpu(hdr->itt);
1643 hdr->rtt = be32_to_cpu(hdr->rtt);
1644 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1645 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1646 hdr->refcmdsn = be32_to_cpu(hdr->refcmdsn);
1647 hdr->exp_datasn = be32_to_cpu(hdr->exp_datasn);
1648 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1649 function = hdr->flags;
1650
1651 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1652 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1653 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1654 hdr->rtt, hdr->refcmdsn, conn->cid);
1655
1656 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1657 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1658 (hdr->rtt != ISCSI_RESERVED_TAG))) {
1659 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1660 hdr->rtt = ISCSI_RESERVED_TAG;
1661 }
1662
1663 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1664 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1665 pr_err("Task Management Request TASK_REASSIGN not"
1666 " issued as immediate command, bad iSCSI Initiator"
1667 "implementation\n");
1668 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1669 buf, conn);
1670 }
1671 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1672 (hdr->refcmdsn != ISCSI_RESERVED_TAG))
1673 hdr->refcmdsn = ISCSI_RESERVED_TAG;
1674
1675 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1676 if (!cmd)
1677 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1678 1, buf, conn);
1679
1680 cmd->data_direction = DMA_NONE;
1681
1682 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1683 if (!cmd->tmr_req) {
1684 pr_err("Unable to allocate memory for"
1685 " Task Management command!\n");
1686 return iscsit_add_reject_from_cmd(
1687 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1688 1, 1, buf, cmd);
1689 }
1690
1691 /*
1692 * TASK_REASSIGN for ERL=2 / connection stays inside of
1693 * LIO-Target $FABRIC_MOD
1694 */
1695 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1696
1697 u8 tcm_function;
1698 int ret;
1699
1700 transport_init_se_cmd(&cmd->se_cmd,
1701 &lio_target_fabric_configfs->tf_ops,
1702 conn->sess->se_sess, 0, DMA_NONE,
1703 MSG_SIMPLE_TAG, &cmd->sense_buffer[0]);
1704
1705 switch (function) {
1706 case ISCSI_TM_FUNC_ABORT_TASK:
1707 tcm_function = TMR_ABORT_TASK;
1708 break;
1709 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1710 tcm_function = TMR_ABORT_TASK_SET;
1711 break;
1712 case ISCSI_TM_FUNC_CLEAR_ACA:
1713 tcm_function = TMR_CLEAR_ACA;
1714 break;
1715 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1716 tcm_function = TMR_CLEAR_TASK_SET;
1717 break;
1718 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1719 tcm_function = TMR_LUN_RESET;
1720 break;
1721 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1722 tcm_function = TMR_TARGET_WARM_RESET;
1723 break;
1724 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1725 tcm_function = TMR_TARGET_COLD_RESET;
1726 break;
1727 default:
1728 pr_err("Unknown iSCSI TMR Function:"
1729 " 0x%02x\n", function);
1730 return iscsit_add_reject_from_cmd(
1731 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1732 1, 1, buf, cmd);
1733 }
1734
1735 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1736 tcm_function, GFP_KERNEL);
1737 if (ret < 0)
1738 return iscsit_add_reject_from_cmd(
1739 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1740 1, 1, buf, cmd);
1741
1742 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1743 }
1744
1745 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1746 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1747 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1748 cmd->init_task_tag = hdr->itt;
1749 cmd->targ_xfer_tag = 0xFFFFFFFF;
1750 cmd->cmd_sn = hdr->cmdsn;
1751 cmd->exp_stat_sn = hdr->exp_statsn;
1752 se_tmr = cmd->se_cmd.se_tmr_req;
1753 tmr_req = cmd->tmr_req;
1754 /*
1755 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1756 */
1757 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1758 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1759 scsilun_to_int(&hdr->lun));
1760 if (ret < 0) {
1761 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1762 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1763 goto attach;
1764 }
1765 }
1766
1767 switch (function) {
1768 case ISCSI_TM_FUNC_ABORT_TASK:
1769 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1770 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1771 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1772 goto attach;
1773 }
1774 break;
1775 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1776 case ISCSI_TM_FUNC_CLEAR_ACA:
1777 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1778 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1779 break;
1780 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1781 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1782 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1783 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1784 goto attach;
1785 }
1786 break;
1787 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1788 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1789 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1790 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1791 goto attach;
1792 }
1793 break;
1794 case ISCSI_TM_FUNC_TASK_REASSIGN:
1795 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1796 /*
1797 * Perform sanity checks on the ExpDataSN only if the
1798 * TASK_REASSIGN was successful.
1799 */
1800 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1801 break;
1802
1803 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1804 return iscsit_add_reject_from_cmd(
1805 ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1806 buf, cmd);
1807 break;
1808 default:
1809 pr_err("Unknown TMR function: 0x%02x, protocol"
1810 " error.\n", function);
1811 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1812 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1813 goto attach;
1814 }
1815
1816 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1817 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1818 se_tmr->call_transport = 1;
1819 attach:
1820 spin_lock_bh(&conn->cmd_lock);
1821 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1822 spin_unlock_bh(&conn->cmd_lock);
1823
1824 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1825 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1826 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1827 out_of_order_cmdsn = 1;
1828 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1829 return 0;
1830 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1831 return iscsit_add_reject_from_cmd(
1832 ISCSI_REASON_PROTOCOL_ERROR,
1833 1, 0, buf, cmd);
1834 }
1835 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1836
1837 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1838 return 0;
1839 /*
1840 * Found the referenced task, send to transport for processing.
1841 */
1842 if (se_tmr->call_transport)
1843 return transport_generic_handle_tmr(&cmd->se_cmd);
1844
1845 /*
1846 * Could not find the referenced LUN, task, or Task Management
1847 * command not authorized or supported. Change state and
1848 * let the tx_thread send the response.
1849 *
1850 * For connection recovery, this is also the default action for
1851 * TMR TASK_REASSIGN.
1852 */
1853 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1854 return 0;
1855 }
1856
1857 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1858 static int iscsit_handle_text_cmd(
1859 struct iscsi_conn *conn,
1860 unsigned char *buf)
1861 {
1862 char *text_ptr, *text_in;
1863 int cmdsn_ret, niov = 0, rx_got, rx_size;
1864 u32 checksum = 0, data_crc = 0, payload_length;
1865 u32 padding = 0, pad_bytes = 0, text_length = 0;
1866 struct iscsi_cmd *cmd;
1867 struct kvec iov[3];
1868 struct iscsi_text *hdr;
1869
1870 hdr = (struct iscsi_text *) buf;
1871 payload_length = ntoh24(hdr->dlength);
1872 hdr->itt = be32_to_cpu(hdr->itt);
1873 hdr->ttt = be32_to_cpu(hdr->ttt);
1874 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1875 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1876
1877 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1878 pr_err("Unable to accept text parameter length: %u"
1879 "greater than MaxRecvDataSegmentLength %u.\n",
1880 payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
1881 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1882 buf, conn);
1883 }
1884
1885 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1886 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1887 hdr->exp_statsn, payload_length);
1888
1889 rx_size = text_length = payload_length;
1890 if (text_length) {
1891 text_in = kzalloc(text_length, GFP_KERNEL);
1892 if (!text_in) {
1893 pr_err("Unable to allocate memory for"
1894 " incoming text parameters\n");
1895 return -1;
1896 }
1897
1898 memset(iov, 0, 3 * sizeof(struct kvec));
1899 iov[niov].iov_base = text_in;
1900 iov[niov++].iov_len = text_length;
1901
1902 padding = ((-payload_length) & 3);
1903 if (padding != 0) {
1904 iov[niov].iov_base = &pad_bytes;
1905 iov[niov++].iov_len = padding;
1906 rx_size += padding;
1907 pr_debug("Receiving %u additional bytes"
1908 " for padding.\n", padding);
1909 }
1910 if (conn->conn_ops->DataDigest) {
1911 iov[niov].iov_base = &checksum;
1912 iov[niov++].iov_len = ISCSI_CRC_LEN;
1913 rx_size += ISCSI_CRC_LEN;
1914 }
1915
1916 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1917 if (rx_got != rx_size) {
1918 kfree(text_in);
1919 return -1;
1920 }
1921
1922 if (conn->conn_ops->DataDigest) {
1923 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1924 text_in, text_length,
1925 padding, (u8 *)&pad_bytes,
1926 (u8 *)&data_crc);
1927
1928 if (checksum != data_crc) {
1929 pr_err("Text data CRC32C DataDigest"
1930 " 0x%08x does not match computed"
1931 " 0x%08x\n", checksum, data_crc);
1932 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1933 pr_err("Unable to recover from"
1934 " Text Data digest failure while in"
1935 " ERL=0.\n");
1936 kfree(text_in);
1937 return -1;
1938 } else {
1939 /*
1940 * Silently drop this PDU and let the
1941 * initiator plug the CmdSN gap.
1942 */
1943 pr_debug("Dropping Text"
1944 " Command CmdSN: 0x%08x due to"
1945 " DataCRC error.\n", hdr->cmdsn);
1946 kfree(text_in);
1947 return 0;
1948 }
1949 } else {
1950 pr_debug("Got CRC32C DataDigest"
1951 " 0x%08x for %u bytes of text data.\n",
1952 checksum, text_length);
1953 }
1954 }
1955 text_in[text_length - 1] = '\0';
1956 pr_debug("Successfully read %d bytes of text"
1957 " data.\n", text_length);
1958
1959 if (strncmp("SendTargets", text_in, 11) != 0) {
1960 pr_err("Received Text Data that is not"
1961 " SendTargets, cannot continue.\n");
1962 kfree(text_in);
1963 return -1;
1964 }
1965 text_ptr = strchr(text_in, '=');
1966 if (!text_ptr) {
1967 pr_err("No \"=\" separator found in Text Data,"
1968 " cannot continue.\n");
1969 kfree(text_in);
1970 return -1;
1971 }
1972 if (strncmp("=All", text_ptr, 4) != 0) {
1973 pr_err("Unable to locate All value for"
1974 " SendTargets key, cannot continue.\n");
1975 kfree(text_in);
1976 return -1;
1977 }
1978 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1979 kfree(text_in);
1980 }
1981
1982 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1983 if (!cmd)
1984 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1985 1, buf, conn);
1986
1987 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1988 cmd->i_state = ISTATE_SEND_TEXTRSP;
1989 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1990 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1991 cmd->targ_xfer_tag = 0xFFFFFFFF;
1992 cmd->cmd_sn = hdr->cmdsn;
1993 cmd->exp_stat_sn = hdr->exp_statsn;
1994 cmd->data_direction = DMA_NONE;
1995
1996 spin_lock_bh(&conn->cmd_lock);
1997 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1998 spin_unlock_bh(&conn->cmd_lock);
1999
2000 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2001
2002 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2003 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2004 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2005 return iscsit_add_reject_from_cmd(
2006 ISCSI_REASON_PROTOCOL_ERROR,
2007 1, 0, buf, cmd);
2008
2009 return 0;
2010 }
2011
2012 return iscsit_execute_cmd(cmd, 0);
2013 }
2014
2015 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2016 {
2017 struct iscsi_conn *conn_p;
2018 struct iscsi_session *sess = conn->sess;
2019
2020 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2021 " for SID: %u.\n", conn->cid, conn->sess->sid);
2022
2023 atomic_set(&sess->session_logout, 1);
2024 atomic_set(&conn->conn_logout_remove, 1);
2025 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2026
2027 iscsit_inc_conn_usage_count(conn);
2028 iscsit_inc_session_usage_count(sess);
2029
2030 spin_lock_bh(&sess->conn_lock);
2031 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2032 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2033 continue;
2034
2035 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2036 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2037 }
2038 spin_unlock_bh(&sess->conn_lock);
2039
2040 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2041
2042 return 0;
2043 }
2044
2045 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2046 {
2047 struct iscsi_conn *l_conn;
2048 struct iscsi_session *sess = conn->sess;
2049
2050 pr_debug("Received logout request CLOSECONNECTION for CID:"
2051 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2052
2053 /*
2054 * A Logout Request with a CLOSECONNECTION reason code for a CID
2055 * can arrive on a connection with a differing CID.
2056 */
2057 if (conn->cid == cmd->logout_cid) {
2058 spin_lock_bh(&conn->state_lock);
2059 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2060 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2061
2062 atomic_set(&conn->conn_logout_remove, 1);
2063 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2064 iscsit_inc_conn_usage_count(conn);
2065
2066 spin_unlock_bh(&conn->state_lock);
2067 } else {
2068 /*
2069 * Handle all different cid CLOSECONNECTION requests in
2070 * iscsit_logout_post_handler_diffcid() as to give enough
2071 * time for any non immediate command's CmdSN to be
2072 * acknowledged on the connection in question.
2073 *
2074 * Here we simply make sure the CID is still around.
2075 */
2076 l_conn = iscsit_get_conn_from_cid(sess,
2077 cmd->logout_cid);
2078 if (!l_conn) {
2079 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2080 iscsit_add_cmd_to_response_queue(cmd, conn,
2081 cmd->i_state);
2082 return 0;
2083 }
2084
2085 iscsit_dec_conn_usage_count(l_conn);
2086 }
2087
2088 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2089
2090 return 0;
2091 }
2092
2093 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2094 {
2095 struct iscsi_session *sess = conn->sess;
2096
2097 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2098 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2099
2100 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2101 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2102 " while ERL!=2.\n");
2103 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2104 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2105 return 0;
2106 }
2107
2108 if (conn->cid == cmd->logout_cid) {
2109 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2110 " with CID: %hu on CID: %hu, implementation error.\n",
2111 cmd->logout_cid, conn->cid);
2112 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2113 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2114 return 0;
2115 }
2116
2117 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2118
2119 return 0;
2120 }
2121
2122 static int iscsit_handle_logout_cmd(
2123 struct iscsi_conn *conn,
2124 unsigned char *buf)
2125 {
2126 int cmdsn_ret, logout_remove = 0;
2127 u8 reason_code = 0;
2128 struct iscsi_cmd *cmd;
2129 struct iscsi_logout *hdr;
2130 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2131
2132 hdr = (struct iscsi_logout *) buf;
2133 reason_code = (hdr->flags & 0x7f);
2134 hdr->itt = be32_to_cpu(hdr->itt);
2135 hdr->cid = be16_to_cpu(hdr->cid);
2136 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
2137 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2138
2139 if (tiqn) {
2140 spin_lock(&tiqn->logout_stats.lock);
2141 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2142 tiqn->logout_stats.normal_logouts++;
2143 else
2144 tiqn->logout_stats.abnormal_logouts++;
2145 spin_unlock(&tiqn->logout_stats.lock);
2146 }
2147
2148 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2149 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2150 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2151 hdr->cid, conn->cid);
2152
2153 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2154 pr_err("Received logout request on connection that"
2155 " is not in logged in state, ignoring request.\n");
2156 return 0;
2157 }
2158
2159 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2160 if (!cmd)
2161 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2162 buf, conn);
2163
2164 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2165 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2166 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2167 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2168 cmd->targ_xfer_tag = 0xFFFFFFFF;
2169 cmd->cmd_sn = hdr->cmdsn;
2170 cmd->exp_stat_sn = hdr->exp_statsn;
2171 cmd->logout_cid = hdr->cid;
2172 cmd->logout_reason = reason_code;
2173 cmd->data_direction = DMA_NONE;
2174
2175 /*
2176 * We need to sleep in these cases (by returning 1) until the Logout
2177 * Response gets sent in the tx thread.
2178 */
2179 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2180 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2181 (hdr->cid == conn->cid)))
2182 logout_remove = 1;
2183
2184 spin_lock_bh(&conn->cmd_lock);
2185 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2186 spin_unlock_bh(&conn->cmd_lock);
2187
2188 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2189 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2190
2191 /*
2192 * Immediate commands are executed, well, immediately.
2193 * Non-Immediate Logout Commands are executed in CmdSN order.
2194 */
2195 if (cmd->immediate_cmd) {
2196 int ret = iscsit_execute_cmd(cmd, 0);
2197
2198 if (ret < 0)
2199 return ret;
2200 } else {
2201 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2202 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2203 logout_remove = 0;
2204 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2205 return iscsit_add_reject_from_cmd(
2206 ISCSI_REASON_PROTOCOL_ERROR,
2207 1, 0, buf, cmd);
2208 }
2209 }
2210
2211 return logout_remove;
2212 }
2213
2214 static int iscsit_handle_snack(
2215 struct iscsi_conn *conn,
2216 unsigned char *buf)
2217 {
2218 struct iscsi_snack *hdr;
2219
2220 hdr = (struct iscsi_snack *) buf;
2221 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2222 hdr->itt = be32_to_cpu(hdr->itt);
2223 hdr->ttt = be32_to_cpu(hdr->ttt);
2224 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2225 hdr->begrun = be32_to_cpu(hdr->begrun);
2226 hdr->runlength = be32_to_cpu(hdr->runlength);
2227
2228 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2229 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2230 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2231 hdr->begrun, hdr->runlength, conn->cid);
2232
2233 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2234 pr_err("Initiator sent SNACK request while in"
2235 " ErrorRecoveryLevel=0.\n");
2236 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2237 buf, conn);
2238 }
2239 /*
2240 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2241 * call from inside iscsi_send_recovery_datain_or_r2t().
2242 */
2243 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2244 case 0:
2245 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2246 hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
2247 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2248 return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
2249 hdr->begrun, hdr->runlength);
2250 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2251 return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
2252 hdr->runlength);
2253 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2254 /* FIXME: Support R-Data SNACK */
2255 pr_err("R-Data SNACK Not Supported.\n");
2256 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2257 buf, conn);
2258 default:
2259 pr_err("Unknown SNACK type 0x%02x, protocol"
2260 " error.\n", hdr->flags & 0x0f);
2261 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2262 buf, conn);
2263 }
2264
2265 return 0;
2266 }
2267
2268 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2269 {
2270 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2271 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2272 wait_for_completion_interruptible_timeout(
2273 &conn->rx_half_close_comp,
2274 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2275 }
2276 }
2277
2278 static int iscsit_handle_immediate_data(
2279 struct iscsi_cmd *cmd,
2280 unsigned char *buf,
2281 u32 length)
2282 {
2283 int iov_ret, rx_got = 0, rx_size = 0;
2284 u32 checksum, iov_count = 0, padding = 0;
2285 struct iscsi_conn *conn = cmd->conn;
2286 struct kvec *iov;
2287
2288 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2289 if (iov_ret < 0)
2290 return IMMEDIATE_DATA_CANNOT_RECOVER;
2291
2292 rx_size = length;
2293 iov_count = iov_ret;
2294 iov = &cmd->iov_data[0];
2295
2296 padding = ((-length) & 3);
2297 if (padding != 0) {
2298 iov[iov_count].iov_base = cmd->pad_bytes;
2299 iov[iov_count++].iov_len = padding;
2300 rx_size += padding;
2301 }
2302
2303 if (conn->conn_ops->DataDigest) {
2304 iov[iov_count].iov_base = &checksum;
2305 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2306 rx_size += ISCSI_CRC_LEN;
2307 }
2308
2309 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2310
2311 iscsit_unmap_iovec(cmd);
2312
2313 if (rx_got != rx_size) {
2314 iscsit_rx_thread_wait_for_tcp(conn);
2315 return IMMEDIATE_DATA_CANNOT_RECOVER;
2316 }
2317
2318 if (conn->conn_ops->DataDigest) {
2319 u32 data_crc;
2320
2321 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2322 cmd->write_data_done, length, padding,
2323 cmd->pad_bytes);
2324
2325 if (checksum != data_crc) {
2326 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2327 " does not match computed 0x%08x\n", checksum,
2328 data_crc);
2329
2330 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2331 pr_err("Unable to recover from"
2332 " Immediate Data digest failure while"
2333 " in ERL=0.\n");
2334 iscsit_add_reject_from_cmd(
2335 ISCSI_REASON_DATA_DIGEST_ERROR,
2336 1, 0, buf, cmd);
2337 return IMMEDIATE_DATA_CANNOT_RECOVER;
2338 } else {
2339 iscsit_add_reject_from_cmd(
2340 ISCSI_REASON_DATA_DIGEST_ERROR,
2341 0, 0, buf, cmd);
2342 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2343 }
2344 } else {
2345 pr_debug("Got CRC32C DataDigest 0x%08x for"
2346 " %u bytes of Immediate Data\n", checksum,
2347 length);
2348 }
2349 }
2350
2351 cmd->write_data_done += length;
2352
2353 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2354 spin_lock_bh(&cmd->istate_lock);
2355 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2356 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2357 spin_unlock_bh(&cmd->istate_lock);
2358 }
2359
2360 return IMMEDIATE_DATA_NORMAL_OPERATION;
2361 }
2362
2363 /*
2364 * Called with sess->conn_lock held.
2365 */
2366 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2367 with active network interface */
2368 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2369 {
2370 struct iscsi_cmd *cmd;
2371 struct iscsi_conn *conn_p;
2372
2373 /*
2374 * Only send a Asynchronous Message on connections whos network
2375 * interface is still functional.
2376 */
2377 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2378 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2379 iscsit_inc_conn_usage_count(conn_p);
2380 break;
2381 }
2382 }
2383
2384 if (!conn_p)
2385 return;
2386
2387 cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
2388 if (!cmd) {
2389 iscsit_dec_conn_usage_count(conn_p);
2390 return;
2391 }
2392
2393 cmd->logout_cid = conn->cid;
2394 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2395 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2396
2397 spin_lock_bh(&conn_p->cmd_lock);
2398 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2399 spin_unlock_bh(&conn_p->cmd_lock);
2400
2401 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2402 iscsit_dec_conn_usage_count(conn_p);
2403 }
2404
2405 static int iscsit_send_conn_drop_async_message(
2406 struct iscsi_cmd *cmd,
2407 struct iscsi_conn *conn)
2408 {
2409 struct iscsi_async *hdr;
2410
2411 cmd->tx_size = ISCSI_HDR_LEN;
2412 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2413
2414 hdr = (struct iscsi_async *) cmd->pdu;
2415 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2416 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2417 cmd->init_task_tag = 0xFFFFFFFF;
2418 cmd->targ_xfer_tag = 0xFFFFFFFF;
2419 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2420 cmd->stat_sn = conn->stat_sn++;
2421 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2422 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2423 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2424 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2425 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2426 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2427 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2428
2429 if (conn->conn_ops->HeaderDigest) {
2430 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2431
2432 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2433 (unsigned char *)hdr, ISCSI_HDR_LEN,
2434 0, NULL, (u8 *)header_digest);
2435
2436 cmd->tx_size += ISCSI_CRC_LEN;
2437 pr_debug("Attaching CRC32C HeaderDigest to"
2438 " Async Message 0x%08x\n", *header_digest);
2439 }
2440
2441 cmd->iov_misc[0].iov_base = cmd->pdu;
2442 cmd->iov_misc[0].iov_len = cmd->tx_size;
2443 cmd->iov_misc_count = 1;
2444
2445 pr_debug("Sending Connection Dropped Async Message StatSN:"
2446 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2447 cmd->logout_cid, conn->cid);
2448 return 0;
2449 }
2450
2451 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2452 {
2453 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2454 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2455 wait_for_completion_interruptible_timeout(
2456 &conn->tx_half_close_comp,
2457 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2458 }
2459 }
2460
2461 static int iscsit_send_data_in(
2462 struct iscsi_cmd *cmd,
2463 struct iscsi_conn *conn)
2464 {
2465 int iov_ret = 0, set_statsn = 0;
2466 u32 iov_count = 0, tx_size = 0;
2467 struct iscsi_datain datain;
2468 struct iscsi_datain_req *dr;
2469 struct iscsi_data_rsp *hdr;
2470 struct kvec *iov;
2471 int eodr = 0;
2472 int ret;
2473
2474 memset(&datain, 0, sizeof(struct iscsi_datain));
2475 dr = iscsit_get_datain_values(cmd, &datain);
2476 if (!dr) {
2477 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2478 cmd->init_task_tag);
2479 return -1;
2480 }
2481
2482 /*
2483 * Be paranoid and double check the logic for now.
2484 */
2485 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2486 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2487 " datain.length: %u exceeds cmd->data_length: %u\n",
2488 cmd->init_task_tag, datain.offset, datain.length,
2489 cmd->se_cmd.data_length);
2490 return -1;
2491 }
2492
2493 spin_lock_bh(&conn->sess->session_stats_lock);
2494 conn->sess->tx_data_octets += datain.length;
2495 if (conn->sess->se_sess->se_node_acl) {
2496 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2497 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2498 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2499 }
2500 spin_unlock_bh(&conn->sess->session_stats_lock);
2501 /*
2502 * Special case for successfully execution w/ both DATAIN
2503 * and Sense Data.
2504 */
2505 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2506 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2507 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2508 else {
2509 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2510 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2511 iscsit_increment_maxcmdsn(cmd, conn->sess);
2512 cmd->stat_sn = conn->stat_sn++;
2513 set_statsn = 1;
2514 } else if (dr->dr_complete ==
2515 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2516 set_statsn = 1;
2517 }
2518
2519 hdr = (struct iscsi_data_rsp *) cmd->pdu;
2520 memset(hdr, 0, ISCSI_HDR_LEN);
2521 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2522 hdr->flags = datain.flags;
2523 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2524 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2525 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2526 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2527 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2528 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2529 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2530 }
2531 }
2532 hton24(hdr->dlength, datain.length);
2533 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2534 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2535 (struct scsi_lun *)&hdr->lun);
2536 else
2537 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2538
2539 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2540 hdr->ttt = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
2541 cpu_to_be32(cmd->targ_xfer_tag) :
2542 0xFFFFFFFF;
2543 hdr->statsn = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
2544 0xFFFFFFFF;
2545 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2546 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2547 hdr->datasn = cpu_to_be32(datain.data_sn);
2548 hdr->offset = cpu_to_be32(datain.offset);
2549
2550 iov = &cmd->iov_data[0];
2551 iov[iov_count].iov_base = cmd->pdu;
2552 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2553 tx_size += ISCSI_HDR_LEN;
2554
2555 if (conn->conn_ops->HeaderDigest) {
2556 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2557
2558 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2559 (unsigned char *)hdr, ISCSI_HDR_LEN,
2560 0, NULL, (u8 *)header_digest);
2561
2562 iov[0].iov_len += ISCSI_CRC_LEN;
2563 tx_size += ISCSI_CRC_LEN;
2564
2565 pr_debug("Attaching CRC32 HeaderDigest"
2566 " for DataIN PDU 0x%08x\n", *header_digest);
2567 }
2568
2569 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2570 if (iov_ret < 0)
2571 return -1;
2572
2573 iov_count += iov_ret;
2574 tx_size += datain.length;
2575
2576 cmd->padding = ((-datain.length) & 3);
2577 if (cmd->padding) {
2578 iov[iov_count].iov_base = cmd->pad_bytes;
2579 iov[iov_count++].iov_len = cmd->padding;
2580 tx_size += cmd->padding;
2581
2582 pr_debug("Attaching %u padding bytes\n",
2583 cmd->padding);
2584 }
2585 if (conn->conn_ops->DataDigest) {
2586 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2587 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2588
2589 iov[iov_count].iov_base = &cmd->data_crc;
2590 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2591 tx_size += ISCSI_CRC_LEN;
2592
2593 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2594 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2595 }
2596
2597 cmd->iov_data_count = iov_count;
2598 cmd->tx_size = tx_size;
2599
2600 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2601 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2602 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2603 ntohl(hdr->offset), datain.length, conn->cid);
2604
2605 /* sendpage is preferred but can't insert markers */
2606 if (!conn->conn_ops->IFMarker)
2607 ret = iscsit_fe_sendpage_sg(cmd, conn);
2608 else
2609 ret = iscsit_send_tx_data(cmd, conn, 0);
2610
2611 iscsit_unmap_iovec(cmd);
2612
2613 if (ret < 0) {
2614 iscsit_tx_thread_wait_for_tcp(conn);
2615 return ret;
2616 }
2617
2618 if (dr->dr_complete) {
2619 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2620 2 : 1;
2621 iscsit_free_datain_req(cmd, dr);
2622 }
2623
2624 return eodr;
2625 }
2626
2627 static int iscsit_send_logout_response(
2628 struct iscsi_cmd *cmd,
2629 struct iscsi_conn *conn)
2630 {
2631 int niov = 0, tx_size;
2632 struct iscsi_conn *logout_conn = NULL;
2633 struct iscsi_conn_recovery *cr = NULL;
2634 struct iscsi_session *sess = conn->sess;
2635 struct kvec *iov;
2636 struct iscsi_logout_rsp *hdr;
2637 /*
2638 * The actual shutting down of Sessions and/or Connections
2639 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2640 * is done in scsi_logout_post_handler().
2641 */
2642 switch (cmd->logout_reason) {
2643 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2644 pr_debug("iSCSI session logout successful, setting"
2645 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2646 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2647 break;
2648 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2649 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2650 break;
2651 /*
2652 * For CLOSECONNECTION logout requests carrying
2653 * a matching logout CID -> local CID, the reference
2654 * for the local CID will have been incremented in
2655 * iscsi_logout_closeconnection().
2656 *
2657 * For CLOSECONNECTION logout requests carrying
2658 * a different CID than the connection it arrived
2659 * on, the connection responding to cmd->logout_cid
2660 * is stopped in iscsit_logout_post_handler_diffcid().
2661 */
2662
2663 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2664 " successful.\n", cmd->logout_cid, conn->cid);
2665 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2666 break;
2667 case ISCSI_LOGOUT_REASON_RECOVERY:
2668 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2669 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2670 break;
2671 /*
2672 * If the connection is still active from our point of view
2673 * force connection recovery to occur.
2674 */
2675 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2676 cmd->logout_cid);
2677 if (logout_conn) {
2678 iscsit_connection_reinstatement_rcfr(logout_conn);
2679 iscsit_dec_conn_usage_count(logout_conn);
2680 }
2681
2682 cr = iscsit_get_inactive_connection_recovery_entry(
2683 conn->sess, cmd->logout_cid);
2684 if (!cr) {
2685 pr_err("Unable to locate CID: %hu for"
2686 " REMOVECONNFORRECOVERY Logout Request.\n",
2687 cmd->logout_cid);
2688 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2689 break;
2690 }
2691
2692 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2693
2694 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2695 " for recovery for CID: %hu on CID: %hu successful.\n",
2696 cmd->logout_cid, conn->cid);
2697 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2698 break;
2699 default:
2700 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2701 cmd->logout_reason);
2702 return -1;
2703 }
2704
2705 tx_size = ISCSI_HDR_LEN;
2706 hdr = (struct iscsi_logout_rsp *)cmd->pdu;
2707 memset(hdr, 0, ISCSI_HDR_LEN);
2708 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2709 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2710 hdr->response = cmd->logout_response;
2711 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2712 cmd->stat_sn = conn->stat_sn++;
2713 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2714
2715 iscsit_increment_maxcmdsn(cmd, conn->sess);
2716 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2717 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2718
2719 iov = &cmd->iov_misc[0];
2720 iov[niov].iov_base = cmd->pdu;
2721 iov[niov++].iov_len = ISCSI_HDR_LEN;
2722
2723 if (conn->conn_ops->HeaderDigest) {
2724 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2725
2726 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2727 (unsigned char *)hdr, ISCSI_HDR_LEN,
2728 0, NULL, (u8 *)header_digest);
2729
2730 iov[0].iov_len += ISCSI_CRC_LEN;
2731 tx_size += ISCSI_CRC_LEN;
2732 pr_debug("Attaching CRC32C HeaderDigest to"
2733 " Logout Response 0x%08x\n", *header_digest);
2734 }
2735 cmd->iov_misc_count = niov;
2736 cmd->tx_size = tx_size;
2737
2738 pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2739 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2740 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2741 cmd->logout_cid, conn->cid);
2742
2743 return 0;
2744 }
2745
2746 /*
2747 * Unsolicited NOPIN, either requesting a response or not.
2748 */
2749 static int iscsit_send_unsolicited_nopin(
2750 struct iscsi_cmd *cmd,
2751 struct iscsi_conn *conn,
2752 int want_response)
2753 {
2754 int tx_size = ISCSI_HDR_LEN;
2755 struct iscsi_nopin *hdr;
2756 int ret;
2757
2758 hdr = (struct iscsi_nopin *) cmd->pdu;
2759 memset(hdr, 0, ISCSI_HDR_LEN);
2760 hdr->opcode = ISCSI_OP_NOOP_IN;
2761 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2762 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2763 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2764 cmd->stat_sn = conn->stat_sn;
2765 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2766 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2767 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2768
2769 if (conn->conn_ops->HeaderDigest) {
2770 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2771
2772 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2773 (unsigned char *)hdr, ISCSI_HDR_LEN,
2774 0, NULL, (u8 *)header_digest);
2775
2776 tx_size += ISCSI_CRC_LEN;
2777 pr_debug("Attaching CRC32C HeaderDigest to"
2778 " NopIN 0x%08x\n", *header_digest);
2779 }
2780
2781 cmd->iov_misc[0].iov_base = cmd->pdu;
2782 cmd->iov_misc[0].iov_len = tx_size;
2783 cmd->iov_misc_count = 1;
2784 cmd->tx_size = tx_size;
2785
2786 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2787 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2788
2789 ret = iscsit_send_tx_data(cmd, conn, 1);
2790 if (ret < 0) {
2791 iscsit_tx_thread_wait_for_tcp(conn);
2792 return ret;
2793 }
2794
2795 spin_lock_bh(&cmd->istate_lock);
2796 cmd->i_state = want_response ?
2797 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2798 spin_unlock_bh(&cmd->istate_lock);
2799
2800 return 0;
2801 }
2802
2803 static int iscsit_send_nopin_response(
2804 struct iscsi_cmd *cmd,
2805 struct iscsi_conn *conn)
2806 {
2807 int niov = 0, tx_size;
2808 u32 padding = 0;
2809 struct kvec *iov;
2810 struct iscsi_nopin *hdr;
2811
2812 tx_size = ISCSI_HDR_LEN;
2813 hdr = (struct iscsi_nopin *) cmd->pdu;
2814 memset(hdr, 0, ISCSI_HDR_LEN);
2815 hdr->opcode = ISCSI_OP_NOOP_IN;
2816 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2817 hton24(hdr->dlength, cmd->buf_ptr_size);
2818 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2819 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2820 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2821 cmd->stat_sn = conn->stat_sn++;
2822 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2823
2824 iscsit_increment_maxcmdsn(cmd, conn->sess);
2825 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2826 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2827
2828 iov = &cmd->iov_misc[0];
2829 iov[niov].iov_base = cmd->pdu;
2830 iov[niov++].iov_len = ISCSI_HDR_LEN;
2831
2832 if (conn->conn_ops->HeaderDigest) {
2833 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2834
2835 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2836 (unsigned char *)hdr, ISCSI_HDR_LEN,
2837 0, NULL, (u8 *)header_digest);
2838
2839 iov[0].iov_len += ISCSI_CRC_LEN;
2840 tx_size += ISCSI_CRC_LEN;
2841 pr_debug("Attaching CRC32C HeaderDigest"
2842 " to NopIn 0x%08x\n", *header_digest);
2843 }
2844
2845 /*
2846 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2847 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2848 */
2849 if (cmd->buf_ptr_size) {
2850 iov[niov].iov_base = cmd->buf_ptr;
2851 iov[niov++].iov_len = cmd->buf_ptr_size;
2852 tx_size += cmd->buf_ptr_size;
2853
2854 pr_debug("Echoing back %u bytes of ping"
2855 " data.\n", cmd->buf_ptr_size);
2856
2857 padding = ((-cmd->buf_ptr_size) & 3);
2858 if (padding != 0) {
2859 iov[niov].iov_base = &cmd->pad_bytes;
2860 iov[niov++].iov_len = padding;
2861 tx_size += padding;
2862 pr_debug("Attaching %u additional"
2863 " padding bytes.\n", padding);
2864 }
2865 if (conn->conn_ops->DataDigest) {
2866 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2867 cmd->buf_ptr, cmd->buf_ptr_size,
2868 padding, (u8 *)&cmd->pad_bytes,
2869 (u8 *)&cmd->data_crc);
2870
2871 iov[niov].iov_base = &cmd->data_crc;
2872 iov[niov++].iov_len = ISCSI_CRC_LEN;
2873 tx_size += ISCSI_CRC_LEN;
2874 pr_debug("Attached DataDigest for %u"
2875 " bytes of ping data, CRC 0x%08x\n",
2876 cmd->buf_ptr_size, cmd->data_crc);
2877 }
2878 }
2879
2880 cmd->iov_misc_count = niov;
2881 cmd->tx_size = tx_size;
2882
2883 pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2884 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2885 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2886
2887 return 0;
2888 }
2889
2890 static int iscsit_send_r2t(
2891 struct iscsi_cmd *cmd,
2892 struct iscsi_conn *conn)
2893 {
2894 int tx_size = 0;
2895 struct iscsi_r2t *r2t;
2896 struct iscsi_r2t_rsp *hdr;
2897 int ret;
2898
2899 r2t = iscsit_get_r2t_from_list(cmd);
2900 if (!r2t)
2901 return -1;
2902
2903 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
2904 memset(hdr, 0, ISCSI_HDR_LEN);
2905 hdr->opcode = ISCSI_OP_R2T;
2906 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2907 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2908 (struct scsi_lun *)&hdr->lun);
2909 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2910 spin_lock_bh(&conn->sess->ttt_lock);
2911 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2912 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2913 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2914 spin_unlock_bh(&conn->sess->ttt_lock);
2915 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
2916 hdr->statsn = cpu_to_be32(conn->stat_sn);
2917 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2918 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2919 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
2920 hdr->data_offset = cpu_to_be32(r2t->offset);
2921 hdr->data_length = cpu_to_be32(r2t->xfer_len);
2922
2923 cmd->iov_misc[0].iov_base = cmd->pdu;
2924 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
2925 tx_size += ISCSI_HDR_LEN;
2926
2927 if (conn->conn_ops->HeaderDigest) {
2928 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2929
2930 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2931 (unsigned char *)hdr, ISCSI_HDR_LEN,
2932 0, NULL, (u8 *)header_digest);
2933
2934 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2935 tx_size += ISCSI_CRC_LEN;
2936 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2937 " PDU 0x%08x\n", *header_digest);
2938 }
2939
2940 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2941 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2942 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2943 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2944 r2t->offset, r2t->xfer_len, conn->cid);
2945
2946 cmd->iov_misc_count = 1;
2947 cmd->tx_size = tx_size;
2948
2949 spin_lock_bh(&cmd->r2t_lock);
2950 r2t->sent_r2t = 1;
2951 spin_unlock_bh(&cmd->r2t_lock);
2952
2953 ret = iscsit_send_tx_data(cmd, conn, 1);
2954 if (ret < 0) {
2955 iscsit_tx_thread_wait_for_tcp(conn);
2956 return ret;
2957 }
2958
2959 spin_lock_bh(&cmd->dataout_timeout_lock);
2960 iscsit_start_dataout_timer(cmd, conn);
2961 spin_unlock_bh(&cmd->dataout_timeout_lock);
2962
2963 return 0;
2964 }
2965
2966 /*
2967 * @recovery: If called from iscsi_task_reassign_complete_write() for
2968 * connection recovery.
2969 */
2970 int iscsit_build_r2ts_for_cmd(
2971 struct iscsi_cmd *cmd,
2972 struct iscsi_conn *conn,
2973 bool recovery)
2974 {
2975 int first_r2t = 1;
2976 u32 offset = 0, xfer_len = 0;
2977
2978 spin_lock_bh(&cmd->r2t_lock);
2979 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2980 spin_unlock_bh(&cmd->r2t_lock);
2981 return 0;
2982 }
2983
2984 if (conn->sess->sess_ops->DataSequenceInOrder &&
2985 !recovery)
2986 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
2987
2988 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2989 if (conn->sess->sess_ops->DataSequenceInOrder) {
2990 offset = cmd->r2t_offset;
2991
2992 if (first_r2t && recovery) {
2993 int new_data_end = offset +
2994 conn->sess->sess_ops->MaxBurstLength -
2995 cmd->next_burst_len;
2996
2997 if (new_data_end > cmd->se_cmd.data_length)
2998 xfer_len = cmd->se_cmd.data_length - offset;
2999 else
3000 xfer_len =
3001 conn->sess->sess_ops->MaxBurstLength -
3002 cmd->next_burst_len;
3003 } else {
3004 int new_data_end = offset +
3005 conn->sess->sess_ops->MaxBurstLength;
3006
3007 if (new_data_end > cmd->se_cmd.data_length)
3008 xfer_len = cmd->se_cmd.data_length - offset;
3009 else
3010 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3011 }
3012 cmd->r2t_offset += xfer_len;
3013
3014 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3015 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3016 } else {
3017 struct iscsi_seq *seq;
3018
3019 seq = iscsit_get_seq_holder_for_r2t(cmd);
3020 if (!seq) {
3021 spin_unlock_bh(&cmd->r2t_lock);
3022 return -1;
3023 }
3024
3025 offset = seq->offset;
3026 xfer_len = seq->xfer_len;
3027
3028 if (cmd->seq_send_order == cmd->seq_count)
3029 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3030 }
3031 cmd->outstanding_r2ts++;
3032 first_r2t = 0;
3033
3034 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3035 spin_unlock_bh(&cmd->r2t_lock);
3036 return -1;
3037 }
3038
3039 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3040 break;
3041 }
3042 spin_unlock_bh(&cmd->r2t_lock);
3043
3044 return 0;
3045 }
3046
3047 static int iscsit_send_status(
3048 struct iscsi_cmd *cmd,
3049 struct iscsi_conn *conn)
3050 {
3051 u8 iov_count = 0, recovery;
3052 u32 padding = 0, tx_size = 0;
3053 struct iscsi_scsi_rsp *hdr;
3054 struct kvec *iov;
3055
3056 recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3057 if (!recovery)
3058 cmd->stat_sn = conn->stat_sn++;
3059
3060 spin_lock_bh(&conn->sess->session_stats_lock);
3061 conn->sess->rsp_pdus++;
3062 spin_unlock_bh(&conn->sess->session_stats_lock);
3063
3064 hdr = (struct iscsi_scsi_rsp *) cmd->pdu;
3065 memset(hdr, 0, ISCSI_HDR_LEN);
3066 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3067 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3068 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3069 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3070 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3071 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3072 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3073 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3074 }
3075 hdr->response = cmd->iscsi_response;
3076 hdr->cmd_status = cmd->se_cmd.scsi_status;
3077 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3078 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3079
3080 iscsit_increment_maxcmdsn(cmd, conn->sess);
3081 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3082 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3083
3084 iov = &cmd->iov_misc[0];
3085 iov[iov_count].iov_base = cmd->pdu;
3086 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3087 tx_size += ISCSI_HDR_LEN;
3088
3089 /*
3090 * Attach SENSE DATA payload to iSCSI Response PDU
3091 */
3092 if (cmd->se_cmd.sense_buffer &&
3093 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3094 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3095 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3096 hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
3097 iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
3098 iov[iov_count++].iov_len =
3099 (cmd->se_cmd.scsi_sense_length + padding);
3100 tx_size += cmd->se_cmd.scsi_sense_length;
3101
3102 if (padding) {
3103 memset(cmd->se_cmd.sense_buffer +
3104 cmd->se_cmd.scsi_sense_length, 0, padding);
3105 tx_size += padding;
3106 pr_debug("Adding %u bytes of padding to"
3107 " SENSE.\n", padding);
3108 }
3109
3110 if (conn->conn_ops->DataDigest) {
3111 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3112 cmd->se_cmd.sense_buffer,
3113 (cmd->se_cmd.scsi_sense_length + padding),
3114 0, NULL, (u8 *)&cmd->data_crc);
3115
3116 iov[iov_count].iov_base = &cmd->data_crc;
3117 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3118 tx_size += ISCSI_CRC_LEN;
3119
3120 pr_debug("Attaching CRC32 DataDigest for"
3121 " SENSE, %u bytes CRC 0x%08x\n",
3122 (cmd->se_cmd.scsi_sense_length + padding),
3123 cmd->data_crc);
3124 }
3125
3126 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3127 " Response PDU\n",
3128 cmd->se_cmd.scsi_sense_length);
3129 }
3130
3131 if (conn->conn_ops->HeaderDigest) {
3132 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3133
3134 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3135 (unsigned char *)hdr, ISCSI_HDR_LEN,
3136 0, NULL, (u8 *)header_digest);
3137
3138 iov[0].iov_len += ISCSI_CRC_LEN;
3139 tx_size += ISCSI_CRC_LEN;
3140 pr_debug("Attaching CRC32 HeaderDigest for Response"
3141 " PDU 0x%08x\n", *header_digest);
3142 }
3143
3144 cmd->iov_misc_count = iov_count;
3145 cmd->tx_size = tx_size;
3146
3147 pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3148 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3149 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3150 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3151
3152 return 0;
3153 }
3154
3155 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3156 {
3157 switch (se_tmr->response) {
3158 case TMR_FUNCTION_COMPLETE:
3159 return ISCSI_TMF_RSP_COMPLETE;
3160 case TMR_TASK_DOES_NOT_EXIST:
3161 return ISCSI_TMF_RSP_NO_TASK;
3162 case TMR_LUN_DOES_NOT_EXIST:
3163 return ISCSI_TMF_RSP_NO_LUN;
3164 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3165 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3166 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3167 return ISCSI_TMF_RSP_AUTH_FAILED;
3168 case TMR_FUNCTION_REJECTED:
3169 default:
3170 return ISCSI_TMF_RSP_REJECTED;
3171 }
3172 }
3173
3174 static int iscsit_send_task_mgt_rsp(
3175 struct iscsi_cmd *cmd,
3176 struct iscsi_conn *conn)
3177 {
3178 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3179 struct iscsi_tm_rsp *hdr;
3180 u32 tx_size = 0;
3181
3182 hdr = (struct iscsi_tm_rsp *) cmd->pdu;
3183 memset(hdr, 0, ISCSI_HDR_LEN);
3184 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3185 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3186 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3187 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3188 cmd->stat_sn = conn->stat_sn++;
3189 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3190
3191 iscsit_increment_maxcmdsn(cmd, conn->sess);
3192 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3193 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3194
3195 cmd->iov_misc[0].iov_base = cmd->pdu;
3196 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3197 tx_size += ISCSI_HDR_LEN;
3198
3199 if (conn->conn_ops->HeaderDigest) {
3200 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3201
3202 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3203 (unsigned char *)hdr, ISCSI_HDR_LEN,
3204 0, NULL, (u8 *)header_digest);
3205
3206 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3207 tx_size += ISCSI_CRC_LEN;
3208 pr_debug("Attaching CRC32 HeaderDigest for Task"
3209 " Mgmt Response PDU 0x%08x\n", *header_digest);
3210 }
3211
3212 cmd->iov_misc_count = 1;
3213 cmd->tx_size = tx_size;
3214
3215 pr_debug("Built Task Management Response ITT: 0x%08x,"
3216 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3217 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3218
3219 return 0;
3220 }
3221
3222 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3223 {
3224 bool ret = false;
3225
3226 if (np->np_sockaddr.ss_family == AF_INET6) {
3227 const struct sockaddr_in6 sin6 = {
3228 .sin6_addr = IN6ADDR_ANY_INIT };
3229 struct sockaddr_in6 *sock_in6 =
3230 (struct sockaddr_in6 *)&np->np_sockaddr;
3231
3232 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3233 sin6.sin6_addr.s6_addr, 16))
3234 ret = true;
3235 } else {
3236 struct sockaddr_in * sock_in =
3237 (struct sockaddr_in *)&np->np_sockaddr;
3238
3239 if (sock_in->sin_addr.s_addr == INADDR_ANY)
3240 ret = true;
3241 }
3242
3243 return ret;
3244 }
3245
3246 #define SENDTARGETS_BUF_LIMIT 32768U
3247
3248 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3249 {
3250 char *payload = NULL;
3251 struct iscsi_conn *conn = cmd->conn;
3252 struct iscsi_portal_group *tpg;
3253 struct iscsi_tiqn *tiqn;
3254 struct iscsi_tpg_np *tpg_np;
3255 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3256 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3257
3258 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3259 SENDTARGETS_BUF_LIMIT);
3260
3261 payload = kzalloc(buffer_len, GFP_KERNEL);
3262 if (!payload) {
3263 pr_err("Unable to allocate memory for sendtargets"
3264 " response.\n");
3265 return -ENOMEM;
3266 }
3267
3268 spin_lock(&tiqn_lock);
3269 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3270 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3271 len += 1;
3272
3273 if ((len + payload_len) > buffer_len) {
3274 end_of_buf = 1;
3275 goto eob;
3276 }
3277 memcpy(payload + payload_len, buf, len);
3278 payload_len += len;
3279
3280 spin_lock(&tiqn->tiqn_tpg_lock);
3281 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3282
3283 spin_lock(&tpg->tpg_state_lock);
3284 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3285 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3286 spin_unlock(&tpg->tpg_state_lock);
3287 continue;
3288 }
3289 spin_unlock(&tpg->tpg_state_lock);
3290
3291 spin_lock(&tpg->tpg_np_lock);
3292 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3293 tpg_np_list) {
3294 struct iscsi_np *np = tpg_np->tpg_np;
3295 bool inaddr_any = iscsit_check_inaddr_any(np);
3296
3297 len = sprintf(buf, "TargetAddress="
3298 "%s%s%s:%hu,%hu",
3299 (np->np_sockaddr.ss_family == AF_INET6) ?
3300 "[" : "", (inaddr_any == false) ?
3301 np->np_ip : conn->local_ip,
3302 (np->np_sockaddr.ss_family == AF_INET6) ?
3303 "]" : "", (inaddr_any == false) ?
3304 np->np_port : conn->local_port,
3305 tpg->tpgt);
3306 len += 1;
3307
3308 if ((len + payload_len) > buffer_len) {
3309 spin_unlock(&tpg->tpg_np_lock);
3310 spin_unlock(&tiqn->tiqn_tpg_lock);
3311 end_of_buf = 1;
3312 goto eob;
3313 }
3314 memcpy(payload + payload_len, buf, len);
3315 payload_len += len;
3316 }
3317 spin_unlock(&tpg->tpg_np_lock);
3318 }
3319 spin_unlock(&tiqn->tiqn_tpg_lock);
3320 eob:
3321 if (end_of_buf)
3322 break;
3323 }
3324 spin_unlock(&tiqn_lock);
3325
3326 cmd->buf_ptr = payload;
3327
3328 return payload_len;
3329 }
3330
3331 /*
3332 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3333 * MaxRecvDataSegmentLength.
3334 */
3335 static int iscsit_send_text_rsp(
3336 struct iscsi_cmd *cmd,
3337 struct iscsi_conn *conn)
3338 {
3339 struct iscsi_text_rsp *hdr;
3340 struct kvec *iov;
3341 u32 padding = 0, tx_size = 0;
3342 int text_length, iov_count = 0;
3343
3344 text_length = iscsit_build_sendtargets_response(cmd);
3345 if (text_length < 0)
3346 return text_length;
3347
3348 padding = ((-text_length) & 3);
3349 if (padding != 0) {
3350 memset(cmd->buf_ptr + text_length, 0, padding);
3351 pr_debug("Attaching %u additional bytes for"
3352 " padding.\n", padding);
3353 }
3354
3355 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3356 memset(hdr, 0, ISCSI_HDR_LEN);
3357 hdr->opcode = ISCSI_OP_TEXT_RSP;
3358 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3359 hton24(hdr->dlength, text_length);
3360 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3361 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3362 cmd->stat_sn = conn->stat_sn++;
3363 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3364
3365 iscsit_increment_maxcmdsn(cmd, conn->sess);
3366 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3367 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3368
3369 iov = &cmd->iov_misc[0];
3370
3371 iov[iov_count].iov_base = cmd->pdu;
3372 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3373 iov[iov_count].iov_base = cmd->buf_ptr;
3374 iov[iov_count++].iov_len = text_length + padding;
3375
3376 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3377
3378 if (conn->conn_ops->HeaderDigest) {
3379 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3380
3381 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3382 (unsigned char *)hdr, ISCSI_HDR_LEN,
3383 0, NULL, (u8 *)header_digest);
3384
3385 iov[0].iov_len += ISCSI_CRC_LEN;
3386 tx_size += ISCSI_CRC_LEN;
3387 pr_debug("Attaching CRC32 HeaderDigest for"
3388 " Text Response PDU 0x%08x\n", *header_digest);
3389 }
3390
3391 if (conn->conn_ops->DataDigest) {
3392 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3393 cmd->buf_ptr, (text_length + padding),
3394 0, NULL, (u8 *)&cmd->data_crc);
3395
3396 iov[iov_count].iov_base = &cmd->data_crc;
3397 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3398 tx_size += ISCSI_CRC_LEN;
3399
3400 pr_debug("Attaching DataDigest for %u bytes of text"
3401 " data, CRC 0x%08x\n", (text_length + padding),
3402 cmd->data_crc);
3403 }
3404
3405 cmd->iov_misc_count = iov_count;
3406 cmd->tx_size = tx_size;
3407
3408 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3409 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3410 text_length, conn->cid);
3411 return 0;
3412 }
3413
3414 static int iscsit_send_reject(
3415 struct iscsi_cmd *cmd,
3416 struct iscsi_conn *conn)
3417 {
3418 u32 iov_count = 0, tx_size = 0;
3419 struct iscsi_reject *hdr;
3420 struct kvec *iov;
3421
3422 hdr = (struct iscsi_reject *) cmd->pdu;
3423 hdr->opcode = ISCSI_OP_REJECT;
3424 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3425 hton24(hdr->dlength, ISCSI_HDR_LEN);
3426 hdr->ffffffff = 0xffffffff;
3427 cmd->stat_sn = conn->stat_sn++;
3428 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3429 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3430 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3431
3432 iov = &cmd->iov_misc[0];
3433
3434 iov[iov_count].iov_base = cmd->pdu;
3435 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3436 iov[iov_count].iov_base = cmd->buf_ptr;
3437 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3438
3439 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3440
3441 if (conn->conn_ops->HeaderDigest) {
3442 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3443
3444 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3445 (unsigned char *)hdr, ISCSI_HDR_LEN,
3446 0, NULL, (u8 *)header_digest);
3447
3448 iov[0].iov_len += ISCSI_CRC_LEN;
3449 tx_size += ISCSI_CRC_LEN;
3450 pr_debug("Attaching CRC32 HeaderDigest for"
3451 " REJECT PDU 0x%08x\n", *header_digest);
3452 }
3453
3454 if (conn->conn_ops->DataDigest) {
3455 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3456 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3457 0, NULL, (u8 *)&cmd->data_crc);
3458
3459 iov[iov_count].iov_base = &cmd->data_crc;
3460 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3461 tx_size += ISCSI_CRC_LEN;
3462 pr_debug("Attaching CRC32 DataDigest for REJECT"
3463 " PDU 0x%08x\n", cmd->data_crc);
3464 }
3465
3466 cmd->iov_misc_count = iov_count;
3467 cmd->tx_size = tx_size;
3468
3469 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3470 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3471
3472 return 0;
3473 }
3474
3475 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3476 {
3477 struct iscsi_thread_set *ts = conn->thread_set;
3478 int ord, cpu;
3479 /*
3480 * thread_id is assigned from iscsit_global->ts_bitmap from
3481 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3482 *
3483 * Here we use thread_id to determine which CPU that this
3484 * iSCSI connection's iscsi_thread_set will be scheduled to
3485 * execute upon.
3486 */
3487 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3488 for_each_online_cpu(cpu) {
3489 if (ord-- == 0) {
3490 cpumask_set_cpu(cpu, conn->conn_cpumask);
3491 return;
3492 }
3493 }
3494 /*
3495 * This should never be reached..
3496 */
3497 dump_stack();
3498 cpumask_setall(conn->conn_cpumask);
3499 }
3500
3501 static inline void iscsit_thread_check_cpumask(
3502 struct iscsi_conn *conn,
3503 struct task_struct *p,
3504 int mode)
3505 {
3506 char buf[128];
3507 /*
3508 * mode == 1 signals iscsi_target_tx_thread() usage.
3509 * mode == 0 signals iscsi_target_rx_thread() usage.
3510 */
3511 if (mode == 1) {
3512 if (!conn->conn_tx_reset_cpumask)
3513 return;
3514 conn->conn_tx_reset_cpumask = 0;
3515 } else {
3516 if (!conn->conn_rx_reset_cpumask)
3517 return;
3518 conn->conn_rx_reset_cpumask = 0;
3519 }
3520 /*
3521 * Update the CPU mask for this single kthread so that
3522 * both TX and RX kthreads are scheduled to run on the
3523 * same CPU.
3524 */
3525 memset(buf, 0, 128);
3526 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3527 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3528 }
3529
3530 static int handle_immediate_queue(struct iscsi_conn *conn)
3531 {
3532 struct iscsi_queue_req *qr;
3533 struct iscsi_cmd *cmd;
3534 u8 state;
3535 int ret;
3536
3537 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3538 atomic_set(&conn->check_immediate_queue, 0);
3539 cmd = qr->cmd;
3540 state = qr->state;
3541 kmem_cache_free(lio_qr_cache, qr);
3542
3543 switch (state) {
3544 case ISTATE_SEND_R2T:
3545 ret = iscsit_send_r2t(cmd, conn);
3546 if (ret < 0)
3547 goto err;
3548 break;
3549 case ISTATE_REMOVE:
3550 if (cmd->data_direction == DMA_TO_DEVICE)
3551 iscsit_stop_dataout_timer(cmd);
3552
3553 spin_lock_bh(&conn->cmd_lock);
3554 list_del(&cmd->i_conn_node);
3555 spin_unlock_bh(&conn->cmd_lock);
3556
3557 iscsit_free_cmd(cmd);
3558 continue;
3559 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3560 iscsit_mod_nopin_response_timer(conn);
3561 ret = iscsit_send_unsolicited_nopin(cmd,
3562 conn, 1);
3563 if (ret < 0)
3564 goto err;
3565 break;
3566 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3567 ret = iscsit_send_unsolicited_nopin(cmd,
3568 conn, 0);
3569 if (ret < 0)
3570 goto err;
3571 break;
3572 default:
3573 pr_err("Unknown Opcode: 0x%02x ITT:"
3574 " 0x%08x, i_state: %d on CID: %hu\n",
3575 cmd->iscsi_opcode, cmd->init_task_tag, state,
3576 conn->cid);
3577 goto err;
3578 }
3579 }
3580
3581 return 0;
3582
3583 err:
3584 return -1;
3585 }
3586
3587 static int handle_response_queue(struct iscsi_conn *conn)
3588 {
3589 struct iscsi_queue_req *qr;
3590 struct iscsi_cmd *cmd;
3591 u8 state;
3592 int ret;
3593
3594 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3595 cmd = qr->cmd;
3596 state = qr->state;
3597 kmem_cache_free(lio_qr_cache, qr);
3598
3599 check_rsp_state:
3600 switch (state) {
3601 case ISTATE_SEND_DATAIN:
3602 ret = iscsit_send_data_in(cmd, conn);
3603 if (ret < 0)
3604 goto err;
3605 else if (!ret)
3606 /* more drs */
3607 goto check_rsp_state;
3608 else if (ret == 1) {
3609 /* all done */
3610 spin_lock_bh(&cmd->istate_lock);
3611 cmd->i_state = ISTATE_SENT_STATUS;
3612 spin_unlock_bh(&cmd->istate_lock);
3613 continue;
3614 } else if (ret == 2) {
3615 /* Still must send status,
3616 SCF_TRANSPORT_TASK_SENSE was set */
3617 spin_lock_bh(&cmd->istate_lock);
3618 cmd->i_state = ISTATE_SEND_STATUS;
3619 spin_unlock_bh(&cmd->istate_lock);
3620 state = ISTATE_SEND_STATUS;
3621 goto check_rsp_state;
3622 }
3623
3624 break;
3625 case ISTATE_SEND_STATUS:
3626 case ISTATE_SEND_STATUS_RECOVERY:
3627 ret = iscsit_send_status(cmd, conn);
3628 break;
3629 case ISTATE_SEND_LOGOUTRSP:
3630 ret = iscsit_send_logout_response(cmd, conn);
3631 break;
3632 case ISTATE_SEND_ASYNCMSG:
3633 ret = iscsit_send_conn_drop_async_message(
3634 cmd, conn);
3635 break;
3636 case ISTATE_SEND_NOPIN:
3637 ret = iscsit_send_nopin_response(cmd, conn);
3638 break;
3639 case ISTATE_SEND_REJECT:
3640 ret = iscsit_send_reject(cmd, conn);
3641 break;
3642 case ISTATE_SEND_TASKMGTRSP:
3643 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3644 if (ret != 0)
3645 break;
3646 ret = iscsit_tmr_post_handler(cmd, conn);
3647 if (ret != 0)
3648 iscsit_fall_back_to_erl0(conn->sess);
3649 break;
3650 case ISTATE_SEND_TEXTRSP:
3651 ret = iscsit_send_text_rsp(cmd, conn);
3652 break;
3653 default:
3654 pr_err("Unknown Opcode: 0x%02x ITT:"
3655 " 0x%08x, i_state: %d on CID: %hu\n",
3656 cmd->iscsi_opcode, cmd->init_task_tag,
3657 state, conn->cid);
3658 goto err;
3659 }
3660 if (ret < 0)
3661 goto err;
3662
3663 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3664 iscsit_tx_thread_wait_for_tcp(conn);
3665 iscsit_unmap_iovec(cmd);
3666 goto err;
3667 }
3668 iscsit_unmap_iovec(cmd);
3669
3670 switch (state) {
3671 case ISTATE_SEND_LOGOUTRSP:
3672 if (!iscsit_logout_post_handler(cmd, conn))
3673 goto restart;
3674 /* fall through */
3675 case ISTATE_SEND_STATUS:
3676 case ISTATE_SEND_ASYNCMSG:
3677 case ISTATE_SEND_NOPIN:
3678 case ISTATE_SEND_STATUS_RECOVERY:
3679 case ISTATE_SEND_TEXTRSP:
3680 case ISTATE_SEND_TASKMGTRSP:
3681 spin_lock_bh(&cmd->istate_lock);
3682 cmd->i_state = ISTATE_SENT_STATUS;
3683 spin_unlock_bh(&cmd->istate_lock);
3684 break;
3685 case ISTATE_SEND_REJECT:
3686 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3687 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3688 complete(&cmd->reject_comp);
3689 goto err;
3690 }
3691 complete(&cmd->reject_comp);
3692 break;
3693 default:
3694 pr_err("Unknown Opcode: 0x%02x ITT:"
3695 " 0x%08x, i_state: %d on CID: %hu\n",
3696 cmd->iscsi_opcode, cmd->init_task_tag,
3697 cmd->i_state, conn->cid);
3698 goto err;
3699 }
3700
3701 if (atomic_read(&conn->check_immediate_queue))
3702 break;
3703 }
3704
3705 return 0;
3706
3707 err:
3708 return -1;
3709 restart:
3710 return -EAGAIN;
3711 }
3712
3713 int iscsi_target_tx_thread(void *arg)
3714 {
3715 int ret = 0;
3716 struct iscsi_conn *conn;
3717 struct iscsi_thread_set *ts = arg;
3718 /*
3719 * Allow ourselves to be interrupted by SIGINT so that a
3720 * connection recovery / failure event can be triggered externally.
3721 */
3722 allow_signal(SIGINT);
3723
3724 restart:
3725 conn = iscsi_tx_thread_pre_handler(ts);
3726 if (!conn)
3727 goto out;
3728
3729 ret = 0;
3730
3731 while (!kthread_should_stop()) {
3732 /*
3733 * Ensure that both TX and RX per connection kthreads
3734 * are scheduled to run on the same CPU.
3735 */
3736 iscsit_thread_check_cpumask(conn, current, 1);
3737
3738 wait_event_interruptible(conn->queues_wq,
3739 !iscsit_conn_all_queues_empty(conn) ||
3740 ts->status == ISCSI_THREAD_SET_RESET);
3741
3742 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3743 signal_pending(current))
3744 goto transport_err;
3745
3746 ret = handle_immediate_queue(conn);
3747 if (ret < 0)
3748 goto transport_err;
3749
3750 ret = handle_response_queue(conn);
3751 if (ret == -EAGAIN)
3752 goto restart;
3753 else if (ret < 0)
3754 goto transport_err;
3755 }
3756
3757 transport_err:
3758 iscsit_take_action_for_connection_exit(conn);
3759 goto restart;
3760 out:
3761 return 0;
3762 }
3763
3764 int iscsi_target_rx_thread(void *arg)
3765 {
3766 int ret;
3767 u8 buffer[ISCSI_HDR_LEN], opcode;
3768 u32 checksum = 0, digest = 0;
3769 struct iscsi_conn *conn = NULL;
3770 struct iscsi_thread_set *ts = arg;
3771 struct kvec iov;
3772 /*
3773 * Allow ourselves to be interrupted by SIGINT so that a
3774 * connection recovery / failure event can be triggered externally.
3775 */
3776 allow_signal(SIGINT);
3777
3778 restart:
3779 conn = iscsi_rx_thread_pre_handler(ts);
3780 if (!conn)
3781 goto out;
3782
3783 while (!kthread_should_stop()) {
3784 /*
3785 * Ensure that both TX and RX per connection kthreads
3786 * are scheduled to run on the same CPU.
3787 */
3788 iscsit_thread_check_cpumask(conn, current, 0);
3789
3790 memset(buffer, 0, ISCSI_HDR_LEN);
3791 memset(&iov, 0, sizeof(struct kvec));
3792
3793 iov.iov_base = buffer;
3794 iov.iov_len = ISCSI_HDR_LEN;
3795
3796 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3797 if (ret != ISCSI_HDR_LEN) {
3798 iscsit_rx_thread_wait_for_tcp(conn);
3799 goto transport_err;
3800 }
3801
3802 /*
3803 * Set conn->bad_hdr for use with REJECT PDUs.
3804 */
3805 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3806
3807 if (conn->conn_ops->HeaderDigest) {
3808 iov.iov_base = &digest;
3809 iov.iov_len = ISCSI_CRC_LEN;
3810
3811 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3812 if (ret != ISCSI_CRC_LEN) {
3813 iscsit_rx_thread_wait_for_tcp(conn);
3814 goto transport_err;
3815 }
3816
3817 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3818 buffer, ISCSI_HDR_LEN,
3819 0, NULL, (u8 *)&checksum);
3820
3821 if (digest != checksum) {
3822 pr_err("HeaderDigest CRC32C failed,"
3823 " received 0x%08x, computed 0x%08x\n",
3824 digest, checksum);
3825 /*
3826 * Set the PDU to 0xff so it will intentionally
3827 * hit default in the switch below.
3828 */
3829 memset(buffer, 0xff, ISCSI_HDR_LEN);
3830 spin_lock_bh(&conn->sess->session_stats_lock);
3831 conn->sess->conn_digest_errors++;
3832 spin_unlock_bh(&conn->sess->session_stats_lock);
3833 } else {
3834 pr_debug("Got HeaderDigest CRC32C"
3835 " 0x%08x\n", checksum);
3836 }
3837 }
3838
3839 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3840 goto transport_err;
3841
3842 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3843
3844 if (conn->sess->sess_ops->SessionType &&
3845 ((!(opcode & ISCSI_OP_TEXT)) ||
3846 (!(opcode & ISCSI_OP_LOGOUT)))) {
3847 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3848 " while in Discovery Session, rejecting.\n", opcode);
3849 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3850 buffer, conn);
3851 goto transport_err;
3852 }
3853
3854 switch (opcode) {
3855 case ISCSI_OP_SCSI_CMD:
3856 if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3857 goto transport_err;
3858 break;
3859 case ISCSI_OP_SCSI_DATA_OUT:
3860 if (iscsit_handle_data_out(conn, buffer) < 0)
3861 goto transport_err;
3862 break;
3863 case ISCSI_OP_NOOP_OUT:
3864 if (iscsit_handle_nop_out(conn, buffer) < 0)
3865 goto transport_err;
3866 break;
3867 case ISCSI_OP_SCSI_TMFUNC:
3868 if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3869 goto transport_err;
3870 break;
3871 case ISCSI_OP_TEXT:
3872 if (iscsit_handle_text_cmd(conn, buffer) < 0)
3873 goto transport_err;
3874 break;
3875 case ISCSI_OP_LOGOUT:
3876 ret = iscsit_handle_logout_cmd(conn, buffer);
3877 if (ret > 0) {
3878 wait_for_completion_timeout(&conn->conn_logout_comp,
3879 SECONDS_FOR_LOGOUT_COMP * HZ);
3880 goto transport_err;
3881 } else if (ret < 0)
3882 goto transport_err;
3883 break;
3884 case ISCSI_OP_SNACK:
3885 if (iscsit_handle_snack(conn, buffer) < 0)
3886 goto transport_err;
3887 break;
3888 default:
3889 pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3890 opcode);
3891 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3892 pr_err("Cannot recover from unknown"
3893 " opcode while ERL=0, closing iSCSI connection"
3894 ".\n");
3895 goto transport_err;
3896 }
3897 if (!conn->conn_ops->OFMarker) {
3898 pr_err("Unable to recover from unknown"
3899 " opcode while OFMarker=No, closing iSCSI"
3900 " connection.\n");
3901 goto transport_err;
3902 }
3903 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3904 pr_err("Unable to recover from unknown"
3905 " opcode, closing iSCSI connection.\n");
3906 goto transport_err;
3907 }
3908 break;
3909 }
3910 }
3911
3912 transport_err:
3913 if (!signal_pending(current))
3914 atomic_set(&conn->transport_failed, 1);
3915 iscsit_take_action_for_connection_exit(conn);
3916 goto restart;
3917 out:
3918 return 0;
3919 }
3920
3921 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3922 {
3923 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3924 struct iscsi_session *sess = conn->sess;
3925 /*
3926 * We expect this function to only ever be called from either RX or TX
3927 * thread context via iscsit_close_connection() once the other context
3928 * has been reset -> returned sleeping pre-handler state.
3929 */
3930 spin_lock_bh(&conn->cmd_lock);
3931 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
3932
3933 list_del(&cmd->i_conn_node);
3934 spin_unlock_bh(&conn->cmd_lock);
3935
3936 iscsit_increment_maxcmdsn(cmd, sess);
3937
3938 iscsit_free_cmd(cmd);
3939
3940 spin_lock_bh(&conn->cmd_lock);
3941 }
3942 spin_unlock_bh(&conn->cmd_lock);
3943 }
3944
3945 static void iscsit_stop_timers_for_cmds(
3946 struct iscsi_conn *conn)
3947 {
3948 struct iscsi_cmd *cmd;
3949
3950 spin_lock_bh(&conn->cmd_lock);
3951 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
3952 if (cmd->data_direction == DMA_TO_DEVICE)
3953 iscsit_stop_dataout_timer(cmd);
3954 }
3955 spin_unlock_bh(&conn->cmd_lock);
3956 }
3957
3958 int iscsit_close_connection(
3959 struct iscsi_conn *conn)
3960 {
3961 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3962 struct iscsi_session *sess = conn->sess;
3963
3964 pr_debug("Closing iSCSI connection CID %hu on SID:"
3965 " %u\n", conn->cid, sess->sid);
3966 /*
3967 * Always up conn_logout_comp just in case the RX Thread is sleeping
3968 * and the logout response never got sent because the connection
3969 * failed.
3970 */
3971 complete(&conn->conn_logout_comp);
3972
3973 iscsi_release_thread_set(conn);
3974
3975 iscsit_stop_timers_for_cmds(conn);
3976 iscsit_stop_nopin_response_timer(conn);
3977 iscsit_stop_nopin_timer(conn);
3978 iscsit_free_queue_reqs_for_conn(conn);
3979
3980 /*
3981 * During Connection recovery drop unacknowledged out of order
3982 * commands for this connection, and prepare the other commands
3983 * for realligence.
3984 *
3985 * During normal operation clear the out of order commands (but
3986 * do not free the struct iscsi_ooo_cmdsn's) and release all
3987 * struct iscsi_cmds.
3988 */
3989 if (atomic_read(&conn->connection_recovery)) {
3990 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
3991 iscsit_prepare_cmds_for_realligance(conn);
3992 } else {
3993 iscsit_clear_ooo_cmdsns_for_conn(conn);
3994 iscsit_release_commands_from_conn(conn);
3995 }
3996
3997 /*
3998 * Handle decrementing session or connection usage count if
3999 * a logout response was not able to be sent because the
4000 * connection failed. Fall back to Session Recovery here.
4001 */
4002 if (atomic_read(&conn->conn_logout_remove)) {
4003 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4004 iscsit_dec_conn_usage_count(conn);
4005 iscsit_dec_session_usage_count(sess);
4006 }
4007 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4008 iscsit_dec_conn_usage_count(conn);
4009
4010 atomic_set(&conn->conn_logout_remove, 0);
4011 atomic_set(&sess->session_reinstatement, 0);
4012 atomic_set(&sess->session_fall_back_to_erl0, 1);
4013 }
4014
4015 spin_lock_bh(&sess->conn_lock);
4016 list_del(&conn->conn_list);
4017
4018 /*
4019 * Attempt to let the Initiator know this connection failed by
4020 * sending an Connection Dropped Async Message on another
4021 * active connection.
4022 */
4023 if (atomic_read(&conn->connection_recovery))
4024 iscsit_build_conn_drop_async_message(conn);
4025
4026 spin_unlock_bh(&sess->conn_lock);
4027
4028 /*
4029 * If connection reinstatement is being performed on this connection,
4030 * up the connection reinstatement semaphore that is being blocked on
4031 * in iscsit_cause_connection_reinstatement().
4032 */
4033 spin_lock_bh(&conn->state_lock);
4034 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4035 spin_unlock_bh(&conn->state_lock);
4036 complete(&conn->conn_wait_comp);
4037 wait_for_completion(&conn->conn_post_wait_comp);
4038 spin_lock_bh(&conn->state_lock);
4039 }
4040
4041 /*
4042 * If connection reinstatement is being performed on this connection
4043 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4044 * connection wait rcfr semaphore that is being blocked on
4045 * an iscsit_connection_reinstatement_rcfr().
4046 */
4047 if (atomic_read(&conn->connection_wait_rcfr)) {
4048 spin_unlock_bh(&conn->state_lock);
4049 complete(&conn->conn_wait_rcfr_comp);
4050 wait_for_completion(&conn->conn_post_wait_comp);
4051 spin_lock_bh(&conn->state_lock);
4052 }
4053 atomic_set(&conn->connection_reinstatement, 1);
4054 spin_unlock_bh(&conn->state_lock);
4055
4056 /*
4057 * If any other processes are accessing this connection pointer we
4058 * must wait until they have completed.
4059 */
4060 iscsit_check_conn_usage_count(conn);
4061
4062 if (conn->conn_rx_hash.tfm)
4063 crypto_free_hash(conn->conn_rx_hash.tfm);
4064 if (conn->conn_tx_hash.tfm)
4065 crypto_free_hash(conn->conn_tx_hash.tfm);
4066
4067 if (conn->conn_cpumask)
4068 free_cpumask_var(conn->conn_cpumask);
4069
4070 kfree(conn->conn_ops);
4071 conn->conn_ops = NULL;
4072
4073 if (conn->sock)
4074 sock_release(conn->sock);
4075 conn->thread_set = NULL;
4076
4077 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4078 conn->conn_state = TARG_CONN_STATE_FREE;
4079 kfree(conn);
4080
4081 spin_lock_bh(&sess->conn_lock);
4082 atomic_dec(&sess->nconn);
4083 pr_debug("Decremented iSCSI connection count to %hu from node:"
4084 " %s\n", atomic_read(&sess->nconn),
4085 sess->sess_ops->InitiatorName);
4086 /*
4087 * Make sure that if one connection fails in an non ERL=2 iSCSI
4088 * Session that they all fail.
4089 */
4090 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4091 !atomic_read(&sess->session_logout))
4092 atomic_set(&sess->session_fall_back_to_erl0, 1);
4093
4094 /*
4095 * If this was not the last connection in the session, and we are
4096 * performing session reinstatement or falling back to ERL=0, call
4097 * iscsit_stop_session() without sleeping to shutdown the other
4098 * active connections.
4099 */
4100 if (atomic_read(&sess->nconn)) {
4101 if (!atomic_read(&sess->session_reinstatement) &&
4102 !atomic_read(&sess->session_fall_back_to_erl0)) {
4103 spin_unlock_bh(&sess->conn_lock);
4104 return 0;
4105 }
4106 if (!atomic_read(&sess->session_stop_active)) {
4107 atomic_set(&sess->session_stop_active, 1);
4108 spin_unlock_bh(&sess->conn_lock);
4109 iscsit_stop_session(sess, 0, 0);
4110 return 0;
4111 }
4112 spin_unlock_bh(&sess->conn_lock);
4113 return 0;
4114 }
4115
4116 /*
4117 * If this was the last connection in the session and one of the
4118 * following is occurring:
4119 *
4120 * Session Reinstatement is not being performed, and are falling back
4121 * to ERL=0 call iscsit_close_session().
4122 *
4123 * Session Logout was requested. iscsit_close_session() will be called
4124 * elsewhere.
4125 *
4126 * Session Continuation is not being performed, start the Time2Retain
4127 * handler and check if sleep_on_sess_wait_sem is active.
4128 */
4129 if (!atomic_read(&sess->session_reinstatement) &&
4130 atomic_read(&sess->session_fall_back_to_erl0)) {
4131 spin_unlock_bh(&sess->conn_lock);
4132 target_put_session(sess->se_sess);
4133
4134 return 0;
4135 } else if (atomic_read(&sess->session_logout)) {
4136 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4137 sess->session_state = TARG_SESS_STATE_FREE;
4138 spin_unlock_bh(&sess->conn_lock);
4139
4140 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4141 complete(&sess->session_wait_comp);
4142
4143 return 0;
4144 } else {
4145 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4146 sess->session_state = TARG_SESS_STATE_FAILED;
4147
4148 if (!atomic_read(&sess->session_continuation)) {
4149 spin_unlock_bh(&sess->conn_lock);
4150 iscsit_start_time2retain_handler(sess);
4151 } else
4152 spin_unlock_bh(&sess->conn_lock);
4153
4154 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4155 complete(&sess->session_wait_comp);
4156
4157 return 0;
4158 }
4159 spin_unlock_bh(&sess->conn_lock);
4160
4161 return 0;
4162 }
4163
4164 int iscsit_close_session(struct iscsi_session *sess)
4165 {
4166 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4167 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4168
4169 if (atomic_read(&sess->nconn)) {
4170 pr_err("%d connection(s) still exist for iSCSI session"
4171 " to %s\n", atomic_read(&sess->nconn),
4172 sess->sess_ops->InitiatorName);
4173 BUG();
4174 }
4175
4176 spin_lock_bh(&se_tpg->session_lock);
4177 atomic_set(&sess->session_logout, 1);
4178 atomic_set(&sess->session_reinstatement, 1);
4179 iscsit_stop_time2retain_timer(sess);
4180 spin_unlock_bh(&se_tpg->session_lock);
4181
4182 /*
4183 * transport_deregister_session_configfs() will clear the
4184 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4185 * can be setting it again with __transport_register_session() in
4186 * iscsi_post_login_handler() again after the iscsit_stop_session()
4187 * completes in iscsi_np context.
4188 */
4189 transport_deregister_session_configfs(sess->se_sess);
4190
4191 /*
4192 * If any other processes are accessing this session pointer we must
4193 * wait until they have completed. If we are in an interrupt (the
4194 * time2retain handler) and contain and active session usage count we
4195 * restart the timer and exit.
4196 */
4197 if (!in_interrupt()) {
4198 if (iscsit_check_session_usage_count(sess) == 1)
4199 iscsit_stop_session(sess, 1, 1);
4200 } else {
4201 if (iscsit_check_session_usage_count(sess) == 2) {
4202 atomic_set(&sess->session_logout, 0);
4203 iscsit_start_time2retain_handler(sess);
4204 return 0;
4205 }
4206 }
4207
4208 transport_deregister_session(sess->se_sess);
4209
4210 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4211 iscsit_free_connection_recovery_entires(sess);
4212
4213 iscsit_free_all_ooo_cmdsns(sess);
4214
4215 spin_lock_bh(&se_tpg->session_lock);
4216 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4217 sess->session_state = TARG_SESS_STATE_FREE;
4218 pr_debug("Released iSCSI session from node: %s\n",
4219 sess->sess_ops->InitiatorName);
4220 tpg->nsessions--;
4221 if (tpg->tpg_tiqn)
4222 tpg->tpg_tiqn->tiqn_nsessions--;
4223
4224 pr_debug("Decremented number of active iSCSI Sessions on"
4225 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4226
4227 spin_lock(&sess_idr_lock);
4228 idr_remove(&sess_idr, sess->session_index);
4229 spin_unlock(&sess_idr_lock);
4230
4231 kfree(sess->sess_ops);
4232 sess->sess_ops = NULL;
4233 spin_unlock_bh(&se_tpg->session_lock);
4234
4235 kfree(sess);
4236 return 0;
4237 }
4238
4239 static void iscsit_logout_post_handler_closesession(
4240 struct iscsi_conn *conn)
4241 {
4242 struct iscsi_session *sess = conn->sess;
4243
4244 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4245 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4246
4247 atomic_set(&conn->conn_logout_remove, 0);
4248 complete(&conn->conn_logout_comp);
4249
4250 iscsit_dec_conn_usage_count(conn);
4251 iscsit_stop_session(sess, 1, 1);
4252 iscsit_dec_session_usage_count(sess);
4253 target_put_session(sess->se_sess);
4254 }
4255
4256 static void iscsit_logout_post_handler_samecid(
4257 struct iscsi_conn *conn)
4258 {
4259 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4260 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4261
4262 atomic_set(&conn->conn_logout_remove, 0);
4263 complete(&conn->conn_logout_comp);
4264
4265 iscsit_cause_connection_reinstatement(conn, 1);
4266 iscsit_dec_conn_usage_count(conn);
4267 }
4268
4269 static void iscsit_logout_post_handler_diffcid(
4270 struct iscsi_conn *conn,
4271 u16 cid)
4272 {
4273 struct iscsi_conn *l_conn;
4274 struct iscsi_session *sess = conn->sess;
4275
4276 if (!sess)
4277 return;
4278
4279 spin_lock_bh(&sess->conn_lock);
4280 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4281 if (l_conn->cid == cid) {
4282 iscsit_inc_conn_usage_count(l_conn);
4283 break;
4284 }
4285 }
4286 spin_unlock_bh(&sess->conn_lock);
4287
4288 if (!l_conn)
4289 return;
4290
4291 if (l_conn->sock)
4292 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4293
4294 spin_lock_bh(&l_conn->state_lock);
4295 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4296 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4297 spin_unlock_bh(&l_conn->state_lock);
4298
4299 iscsit_cause_connection_reinstatement(l_conn, 1);
4300 iscsit_dec_conn_usage_count(l_conn);
4301 }
4302
4303 /*
4304 * Return of 0 causes the TX thread to restart.
4305 */
4306 static int iscsit_logout_post_handler(
4307 struct iscsi_cmd *cmd,
4308 struct iscsi_conn *conn)
4309 {
4310 int ret = 0;
4311
4312 switch (cmd->logout_reason) {
4313 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4314 switch (cmd->logout_response) {
4315 case ISCSI_LOGOUT_SUCCESS:
4316 case ISCSI_LOGOUT_CLEANUP_FAILED:
4317 default:
4318 iscsit_logout_post_handler_closesession(conn);
4319 break;
4320 }
4321 ret = 0;
4322 break;
4323 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4324 if (conn->cid == cmd->logout_cid) {
4325 switch (cmd->logout_response) {
4326 case ISCSI_LOGOUT_SUCCESS:
4327 case ISCSI_LOGOUT_CLEANUP_FAILED:
4328 default:
4329 iscsit_logout_post_handler_samecid(conn);
4330 break;
4331 }
4332 ret = 0;
4333 } else {
4334 switch (cmd->logout_response) {
4335 case ISCSI_LOGOUT_SUCCESS:
4336 iscsit_logout_post_handler_diffcid(conn,
4337 cmd->logout_cid);
4338 break;
4339 case ISCSI_LOGOUT_CID_NOT_FOUND:
4340 case ISCSI_LOGOUT_CLEANUP_FAILED:
4341 default:
4342 break;
4343 }
4344 ret = 1;
4345 }
4346 break;
4347 case ISCSI_LOGOUT_REASON_RECOVERY:
4348 switch (cmd->logout_response) {
4349 case ISCSI_LOGOUT_SUCCESS:
4350 case ISCSI_LOGOUT_CID_NOT_FOUND:
4351 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4352 case ISCSI_LOGOUT_CLEANUP_FAILED:
4353 default:
4354 break;
4355 }
4356 ret = 1;
4357 break;
4358 default:
4359 break;
4360
4361 }
4362 return ret;
4363 }
4364
4365 void iscsit_fail_session(struct iscsi_session *sess)
4366 {
4367 struct iscsi_conn *conn;
4368
4369 spin_lock_bh(&sess->conn_lock);
4370 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4371 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4372 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4373 }
4374 spin_unlock_bh(&sess->conn_lock);
4375
4376 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4377 sess->session_state = TARG_SESS_STATE_FAILED;
4378 }
4379
4380 int iscsit_free_session(struct iscsi_session *sess)
4381 {
4382 u16 conn_count = atomic_read(&sess->nconn);
4383 struct iscsi_conn *conn, *conn_tmp = NULL;
4384 int is_last;
4385
4386 spin_lock_bh(&sess->conn_lock);
4387 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4388
4389 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4390 conn_list) {
4391 if (conn_count == 0)
4392 break;
4393
4394 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4395 is_last = 1;
4396 } else {
4397 iscsit_inc_conn_usage_count(conn_tmp);
4398 is_last = 0;
4399 }
4400 iscsit_inc_conn_usage_count(conn);
4401
4402 spin_unlock_bh(&sess->conn_lock);
4403 iscsit_cause_connection_reinstatement(conn, 1);
4404 spin_lock_bh(&sess->conn_lock);
4405
4406 iscsit_dec_conn_usage_count(conn);
4407 if (is_last == 0)
4408 iscsit_dec_conn_usage_count(conn_tmp);
4409
4410 conn_count--;
4411 }
4412
4413 if (atomic_read(&sess->nconn)) {
4414 spin_unlock_bh(&sess->conn_lock);
4415 wait_for_completion(&sess->session_wait_comp);
4416 } else
4417 spin_unlock_bh(&sess->conn_lock);
4418
4419 target_put_session(sess->se_sess);
4420 return 0;
4421 }
4422
4423 void iscsit_stop_session(
4424 struct iscsi_session *sess,
4425 int session_sleep,
4426 int connection_sleep)
4427 {
4428 u16 conn_count = atomic_read(&sess->nconn);
4429 struct iscsi_conn *conn, *conn_tmp = NULL;
4430 int is_last;
4431
4432 spin_lock_bh(&sess->conn_lock);
4433 if (session_sleep)
4434 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4435
4436 if (connection_sleep) {
4437 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4438 conn_list) {
4439 if (conn_count == 0)
4440 break;
4441
4442 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4443 is_last = 1;
4444 } else {
4445 iscsit_inc_conn_usage_count(conn_tmp);
4446 is_last = 0;
4447 }
4448 iscsit_inc_conn_usage_count(conn);
4449
4450 spin_unlock_bh(&sess->conn_lock);
4451 iscsit_cause_connection_reinstatement(conn, 1);
4452 spin_lock_bh(&sess->conn_lock);
4453
4454 iscsit_dec_conn_usage_count(conn);
4455 if (is_last == 0)
4456 iscsit_dec_conn_usage_count(conn_tmp);
4457 conn_count--;
4458 }
4459 } else {
4460 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4461 iscsit_cause_connection_reinstatement(conn, 0);
4462 }
4463
4464 if (session_sleep && atomic_read(&sess->nconn)) {
4465 spin_unlock_bh(&sess->conn_lock);
4466 wait_for_completion(&sess->session_wait_comp);
4467 } else
4468 spin_unlock_bh(&sess->conn_lock);
4469 }
4470
4471 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4472 {
4473 struct iscsi_session *sess;
4474 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4475 struct se_session *se_sess, *se_sess_tmp;
4476 int session_count = 0;
4477
4478 spin_lock_bh(&se_tpg->session_lock);
4479 if (tpg->nsessions && !force) {
4480 spin_unlock_bh(&se_tpg->session_lock);
4481 return -1;
4482 }
4483
4484 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4485 sess_list) {
4486 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4487
4488 spin_lock(&sess->conn_lock);
4489 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4490 atomic_read(&sess->session_logout) ||
4491 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4492 spin_unlock(&sess->conn_lock);
4493 continue;
4494 }
4495 atomic_set(&sess->session_reinstatement, 1);
4496 spin_unlock(&sess->conn_lock);
4497 spin_unlock_bh(&se_tpg->session_lock);
4498
4499 iscsit_free_session(sess);
4500 spin_lock_bh(&se_tpg->session_lock);
4501
4502 session_count++;
4503 }
4504 spin_unlock_bh(&se_tpg->session_lock);
4505
4506 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4507 " Group: %hu\n", session_count, tpg->tpgt);
4508 return 0;
4509 }
4510
4511 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4512 MODULE_VERSION("4.1.x");
4513 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4514 MODULE_LICENSE("GPL");
4515
4516 module_init(iscsi_target_init_module);
4517 module_exit(iscsi_target_cleanup_module);
Linux ARM platform port for MOXA ART SoC