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USB: cp210x: call generic open last in open
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / target / iscsi / iscsi_target.c
blob8599545cdf9e6d6c90a07510844f6290ab0a1be6
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 <asm/unaligned.h>
27 #include <scsi/scsi_device.h>
28 #include <scsi/iscsi_proto.h>
29 #include <target/target_core_base.h>
30 #include <target/target_core_tmr.h>
31 #include <target/target_core_transport.h>
32
33 #include "iscsi_target_core.h"
34 #include "iscsi_target_parameters.h"
35 #include "iscsi_target_seq_pdu_list.h"
36 #include "iscsi_target_tq.h"
37 #include "iscsi_target_configfs.h"
38 #include "iscsi_target_datain_values.h"
39 #include "iscsi_target_erl0.h"
40 #include "iscsi_target_erl1.h"
41 #include "iscsi_target_erl2.h"
42 #include "iscsi_target_login.h"
43 #include "iscsi_target_tmr.h"
44 #include "iscsi_target_tpg.h"
45 #include "iscsi_target_util.h"
46 #include "iscsi_target.h"
47 #include "iscsi_target_device.h"
48 #include "iscsi_target_stat.h"
49
50 static LIST_HEAD(g_tiqn_list);
51 static LIST_HEAD(g_np_list);
52 static DEFINE_SPINLOCK(tiqn_lock);
53 static DEFINE_SPINLOCK(np_lock);
54
55 static struct idr tiqn_idr;
56 struct idr sess_idr;
57 struct mutex auth_id_lock;
58 spinlock_t sess_idr_lock;
59
60 struct iscsit_global *iscsit_global;
61
62 struct kmem_cache *lio_cmd_cache;
63 struct kmem_cache *lio_qr_cache;
64 struct kmem_cache *lio_dr_cache;
65 struct kmem_cache *lio_ooo_cache;
66 struct kmem_cache *lio_r2t_cache;
67
68 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
69 unsigned char *buf, u32);
70 static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
71
72 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
73 {
74 struct iscsi_tiqn *tiqn = NULL;
75
76 spin_lock(&tiqn_lock);
77 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
78 if (!strcmp(tiqn->tiqn, buf)) {
79
80 spin_lock(&tiqn->tiqn_state_lock);
81 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
82 tiqn->tiqn_access_count++;
83 spin_unlock(&tiqn->tiqn_state_lock);
84 spin_unlock(&tiqn_lock);
85 return tiqn;
86 }
87 spin_unlock(&tiqn->tiqn_state_lock);
88 }
89 }
90 spin_unlock(&tiqn_lock);
91
92 return NULL;
93 }
94
95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
96 {
97 spin_lock(&tiqn->tiqn_state_lock);
98 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
99 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
100 spin_unlock(&tiqn->tiqn_state_lock);
101 return 0;
102 }
103 spin_unlock(&tiqn->tiqn_state_lock);
104
105 return -1;
106 }
107
108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
109 {
110 spin_lock(&tiqn->tiqn_state_lock);
111 tiqn->tiqn_access_count--;
112 spin_unlock(&tiqn->tiqn_state_lock);
113 }
114
115 /*
116 * Note that IQN formatting is expected to be done in userspace, and
117 * no explict IQN format checks are done here.
118 */
119 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
120 {
121 struct iscsi_tiqn *tiqn = NULL;
122 int ret;
123
124 if (strlen(buf) >= ISCSI_IQN_LEN) {
125 pr_err("Target IQN exceeds %d bytes\n",
126 ISCSI_IQN_LEN);
127 return ERR_PTR(-EINVAL);
128 }
129
130 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
131 if (!tiqn) {
132 pr_err("Unable to allocate struct iscsi_tiqn\n");
133 return ERR_PTR(-ENOMEM);
134 }
135
136 sprintf(tiqn->tiqn, "%s", buf);
137 INIT_LIST_HEAD(&tiqn->tiqn_list);
138 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
139 spin_lock_init(&tiqn->tiqn_state_lock);
140 spin_lock_init(&tiqn->tiqn_tpg_lock);
141 spin_lock_init(&tiqn->sess_err_stats.lock);
142 spin_lock_init(&tiqn->login_stats.lock);
143 spin_lock_init(&tiqn->logout_stats.lock);
144
145 if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) {
146 pr_err("idr_pre_get() for tiqn_idr failed\n");
147 kfree(tiqn);
148 return ERR_PTR(-ENOMEM);
149 }
150 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
151
152 spin_lock(&tiqn_lock);
153 ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index);
154 if (ret < 0) {
155 pr_err("idr_get_new() failed for tiqn->tiqn_index\n");
156 spin_unlock(&tiqn_lock);
157 kfree(tiqn);
158 return ERR_PTR(ret);
159 }
160 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
161 spin_unlock(&tiqn_lock);
162
163 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
164
165 return tiqn;
166
167 }
168
169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
170 {
171 /*
172 * Wait for accesses to said struct iscsi_tiqn to end.
173 */
174 spin_lock(&tiqn->tiqn_state_lock);
175 while (tiqn->tiqn_access_count != 0) {
176 spin_unlock(&tiqn->tiqn_state_lock);
177 msleep(10);
178 spin_lock(&tiqn->tiqn_state_lock);
179 }
180 spin_unlock(&tiqn->tiqn_state_lock);
181 }
182
183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
184 {
185 /*
186 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
187 * while holding tiqn->tiqn_state_lock. This means that all subsequent
188 * attempts to access this struct iscsi_tiqn will fail from both transport
189 * fabric and control code paths.
190 */
191 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
192 pr_err("iscsit_set_tiqn_shutdown() failed\n");
193 return;
194 }
195
196 iscsit_wait_for_tiqn(tiqn);
197
198 spin_lock(&tiqn_lock);
199 list_del(&tiqn->tiqn_list);
200 idr_remove(&tiqn_idr, tiqn->tiqn_index);
201 spin_unlock(&tiqn_lock);
202
203 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
204 tiqn->tiqn);
205 kfree(tiqn);
206 }
207
208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
209 {
210 int ret;
211 /*
212 * Determine if the network portal is accepting storage traffic.
213 */
214 spin_lock_bh(&np->np_thread_lock);
215 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
216 spin_unlock_bh(&np->np_thread_lock);
217 return -1;
218 }
219 if (np->np_login_tpg) {
220 pr_err("np->np_login_tpg() is not NULL!\n");
221 spin_unlock_bh(&np->np_thread_lock);
222 return -1;
223 }
224 spin_unlock_bh(&np->np_thread_lock);
225 /*
226 * Determine if the portal group is accepting storage traffic.
227 */
228 spin_lock_bh(&tpg->tpg_state_lock);
229 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
230 spin_unlock_bh(&tpg->tpg_state_lock);
231 return -1;
232 }
233 spin_unlock_bh(&tpg->tpg_state_lock);
234
235 /*
236 * Here we serialize access across the TIQN+TPG Tuple.
237 */
238 ret = mutex_lock_interruptible(&tpg->np_login_lock);
239 if ((ret != 0) || signal_pending(current))
240 return -1;
241
242 spin_lock_bh(&np->np_thread_lock);
243 np->np_login_tpg = tpg;
244 spin_unlock_bh(&np->np_thread_lock);
245
246 return 0;
247 }
248
249 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
250 {
251 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
252
253 spin_lock_bh(&np->np_thread_lock);
254 np->np_login_tpg = NULL;
255 spin_unlock_bh(&np->np_thread_lock);
256
257 mutex_unlock(&tpg->np_login_lock);
258
259 if (tiqn)
260 iscsit_put_tiqn_for_login(tiqn);
261
262 return 0;
263 }
264
265 static struct iscsi_np *iscsit_get_np(
266 struct __kernel_sockaddr_storage *sockaddr,
267 int network_transport)
268 {
269 struct sockaddr_in *sock_in, *sock_in_e;
270 struct sockaddr_in6 *sock_in6, *sock_in6_e;
271 struct iscsi_np *np;
272 int ip_match = 0;
273 u16 port;
274
275 spin_lock_bh(&np_lock);
276 list_for_each_entry(np, &g_np_list, np_list) {
277 spin_lock(&np->np_thread_lock);
278 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
279 spin_unlock(&np->np_thread_lock);
280 continue;
281 }
282
283 if (sockaddr->ss_family == AF_INET6) {
284 sock_in6 = (struct sockaddr_in6 *)sockaddr;
285 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
286
287 if (!memcmp((void *)&sock_in6->sin6_addr.in6_u,
288 (void *)&sock_in6_e->sin6_addr.in6_u,
289 sizeof(struct in6_addr)))
290 ip_match = 1;
291
292 port = ntohs(sock_in6->sin6_port);
293 } else {
294 sock_in = (struct sockaddr_in *)sockaddr;
295 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
296
297 if (sock_in->sin_addr.s_addr ==
298 sock_in_e->sin_addr.s_addr)
299 ip_match = 1;
300
301 port = ntohs(sock_in->sin_port);
302 }
303
304 if ((ip_match == 1) && (np->np_port == port) &&
305 (np->np_network_transport == network_transport)) {
306 /*
307 * Increment the np_exports reference count now to
308 * prevent iscsit_del_np() below from being called
309 * while iscsi_tpg_add_network_portal() is called.
310 */
311 np->np_exports++;
312 spin_unlock(&np->np_thread_lock);
313 spin_unlock_bh(&np_lock);
314 return np;
315 }
316 spin_unlock(&np->np_thread_lock);
317 }
318 spin_unlock_bh(&np_lock);
319
320 return NULL;
321 }
322
323 struct iscsi_np *iscsit_add_np(
324 struct __kernel_sockaddr_storage *sockaddr,
325 char *ip_str,
326 int network_transport)
327 {
328 struct sockaddr_in *sock_in;
329 struct sockaddr_in6 *sock_in6;
330 struct iscsi_np *np;
331 int ret;
332 /*
333 * Locate the existing struct iscsi_np if already active..
334 */
335 np = iscsit_get_np(sockaddr, network_transport);
336 if (np)
337 return np;
338
339 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
340 if (!np) {
341 pr_err("Unable to allocate memory for struct iscsi_np\n");
342 return ERR_PTR(-ENOMEM);
343 }
344
345 np->np_flags |= NPF_IP_NETWORK;
346 if (sockaddr->ss_family == AF_INET6) {
347 sock_in6 = (struct sockaddr_in6 *)sockaddr;
348 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
349 np->np_port = ntohs(sock_in6->sin6_port);
350 } else {
351 sock_in = (struct sockaddr_in *)sockaddr;
352 sprintf(np->np_ip, "%s", ip_str);
353 np->np_port = ntohs(sock_in->sin_port);
354 }
355
356 np->np_network_transport = network_transport;
357 spin_lock_init(&np->np_thread_lock);
358 init_completion(&np->np_restart_comp);
359 INIT_LIST_HEAD(&np->np_list);
360
361 ret = iscsi_target_setup_login_socket(np, sockaddr);
362 if (ret != 0) {
363 kfree(np);
364 return ERR_PTR(ret);
365 }
366
367 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
368 if (IS_ERR(np->np_thread)) {
369 pr_err("Unable to create kthread: iscsi_np\n");
370 ret = PTR_ERR(np->np_thread);
371 kfree(np);
372 return ERR_PTR(ret);
373 }
374 /*
375 * Increment the np_exports reference count now to prevent
376 * iscsit_del_np() below from being run while a new call to
377 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
378 * active. We don't need to hold np->np_thread_lock at this
379 * point because iscsi_np has not been added to g_np_list yet.
380 */
381 np->np_exports = 1;
382
383 spin_lock_bh(&np_lock);
384 list_add_tail(&np->np_list, &g_np_list);
385 spin_unlock_bh(&np_lock);
386
387 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
388 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
389 "TCP" : "SCTP");
390
391 return np;
392 }
393
394 int iscsit_reset_np_thread(
395 struct iscsi_np *np,
396 struct iscsi_tpg_np *tpg_np,
397 struct iscsi_portal_group *tpg)
398 {
399 spin_lock_bh(&np->np_thread_lock);
400 if (tpg && tpg_np) {
401 /*
402 * The reset operation need only be performed when the
403 * passed struct iscsi_portal_group has a login in progress
404 * to one of the network portals.
405 */
406 if (tpg_np->tpg_np->np_login_tpg != tpg) {
407 spin_unlock_bh(&np->np_thread_lock);
408 return 0;
409 }
410 }
411 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
412 spin_unlock_bh(&np->np_thread_lock);
413 return 0;
414 }
415 np->np_thread_state = ISCSI_NP_THREAD_RESET;
416
417 if (np->np_thread) {
418 spin_unlock_bh(&np->np_thread_lock);
419 send_sig(SIGINT, np->np_thread, 1);
420 wait_for_completion(&np->np_restart_comp);
421 spin_lock_bh(&np->np_thread_lock);
422 }
423 spin_unlock_bh(&np->np_thread_lock);
424
425 return 0;
426 }
427
428 int iscsit_del_np_comm(struct iscsi_np *np)
429 {
430 if (!np->np_socket)
431 return 0;
432
433 /*
434 * Some network transports allocate their own struct sock->file,
435 * see if we need to free any additional allocated resources.
436 */
437 if (np->np_flags & NPF_SCTP_STRUCT_FILE) {
438 kfree(np->np_socket->file);
439 np->np_socket->file = NULL;
440 }
441
442 sock_release(np->np_socket);
443 return 0;
444 }
445
446 int iscsit_del_np(struct iscsi_np *np)
447 {
448 spin_lock_bh(&np->np_thread_lock);
449 np->np_exports--;
450 if (np->np_exports) {
451 spin_unlock_bh(&np->np_thread_lock);
452 return 0;
453 }
454 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
455 spin_unlock_bh(&np->np_thread_lock);
456
457 if (np->np_thread) {
458 /*
459 * We need to send the signal to wakeup Linux/Net
460 * which may be sleeping in sock_accept()..
461 */
462 send_sig(SIGINT, np->np_thread, 1);
463 kthread_stop(np->np_thread);
464 }
465 iscsit_del_np_comm(np);
466
467 spin_lock_bh(&np_lock);
468 list_del(&np->np_list);
469 spin_unlock_bh(&np_lock);
470
471 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
472 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
473 "TCP" : "SCTP");
474
475 kfree(np);
476 return 0;
477 }
478
479 static int __init iscsi_target_init_module(void)
480 {
481 int ret = 0;
482
483 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
484
485 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
486 if (!iscsit_global) {
487 pr_err("Unable to allocate memory for iscsit_global\n");
488 return -1;
489 }
490 mutex_init(&auth_id_lock);
491 spin_lock_init(&sess_idr_lock);
492 idr_init(&tiqn_idr);
493 idr_init(&sess_idr);
494
495 ret = iscsi_target_register_configfs();
496 if (ret < 0)
497 goto out;
498
499 ret = iscsi_thread_set_init();
500 if (ret < 0)
501 goto configfs_out;
502
503 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
504 TARGET_THREAD_SET_COUNT) {
505 pr_err("iscsi_allocate_thread_sets() returned"
506 " unexpected value!\n");
507 goto ts_out1;
508 }
509
510 lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
511 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
512 0, NULL);
513 if (!lio_cmd_cache) {
514 pr_err("Unable to kmem_cache_create() for"
515 " lio_cmd_cache\n");
516 goto ts_out2;
517 }
518
519 lio_qr_cache = kmem_cache_create("lio_qr_cache",
520 sizeof(struct iscsi_queue_req),
521 __alignof__(struct iscsi_queue_req), 0, NULL);
522 if (!lio_qr_cache) {
523 pr_err("nable to kmem_cache_create() for"
524 " lio_qr_cache\n");
525 goto cmd_out;
526 }
527
528 lio_dr_cache = kmem_cache_create("lio_dr_cache",
529 sizeof(struct iscsi_datain_req),
530 __alignof__(struct iscsi_datain_req), 0, NULL);
531 if (!lio_dr_cache) {
532 pr_err("Unable to kmem_cache_create() for"
533 " lio_dr_cache\n");
534 goto qr_out;
535 }
536
537 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
538 sizeof(struct iscsi_ooo_cmdsn),
539 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
540 if (!lio_ooo_cache) {
541 pr_err("Unable to kmem_cache_create() for"
542 " lio_ooo_cache\n");
543 goto dr_out;
544 }
545
546 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
547 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
548 0, NULL);
549 if (!lio_r2t_cache) {
550 pr_err("Unable to kmem_cache_create() for"
551 " lio_r2t_cache\n");
552 goto ooo_out;
553 }
554
555 if (iscsit_load_discovery_tpg() < 0)
556 goto r2t_out;
557
558 return ret;
559 r2t_out:
560 kmem_cache_destroy(lio_r2t_cache);
561 ooo_out:
562 kmem_cache_destroy(lio_ooo_cache);
563 dr_out:
564 kmem_cache_destroy(lio_dr_cache);
565 qr_out:
566 kmem_cache_destroy(lio_qr_cache);
567 cmd_out:
568 kmem_cache_destroy(lio_cmd_cache);
569 ts_out2:
570 iscsi_deallocate_thread_sets();
571 ts_out1:
572 iscsi_thread_set_free();
573 configfs_out:
574 iscsi_target_deregister_configfs();
575 out:
576 kfree(iscsit_global);
577 return -ENOMEM;
578 }
579
580 static void __exit iscsi_target_cleanup_module(void)
581 {
582 iscsi_deallocate_thread_sets();
583 iscsi_thread_set_free();
584 iscsit_release_discovery_tpg();
585 kmem_cache_destroy(lio_cmd_cache);
586 kmem_cache_destroy(lio_qr_cache);
587 kmem_cache_destroy(lio_dr_cache);
588 kmem_cache_destroy(lio_ooo_cache);
589 kmem_cache_destroy(lio_r2t_cache);
590
591 iscsi_target_deregister_configfs();
592
593 kfree(iscsit_global);
594 }
595
596 int iscsit_add_reject(
597 u8 reason,
598 int fail_conn,
599 unsigned char *buf,
600 struct iscsi_conn *conn)
601 {
602 struct iscsi_cmd *cmd;
603 struct iscsi_reject *hdr;
604 int ret;
605
606 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
607 if (!cmd)
608 return -1;
609
610 cmd->iscsi_opcode = ISCSI_OP_REJECT;
611 if (fail_conn)
612 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
613
614 hdr = (struct iscsi_reject *) cmd->pdu;
615 hdr->reason = reason;
616
617 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
618 if (!cmd->buf_ptr) {
619 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
620 iscsit_release_cmd(cmd);
621 return -1;
622 }
623
624 spin_lock_bh(&conn->cmd_lock);
625 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
626 spin_unlock_bh(&conn->cmd_lock);
627
628 cmd->i_state = ISTATE_SEND_REJECT;
629 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
630
631 ret = wait_for_completion_interruptible(&cmd->reject_comp);
632 if (ret != 0)
633 return -1;
634
635 return (!fail_conn) ? 0 : -1;
636 }
637
638 int iscsit_add_reject_from_cmd(
639 u8 reason,
640 int fail_conn,
641 int add_to_conn,
642 unsigned char *buf,
643 struct iscsi_cmd *cmd)
644 {
645 struct iscsi_conn *conn;
646 struct iscsi_reject *hdr;
647 int ret;
648
649 if (!cmd->conn) {
650 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
651 cmd->init_task_tag);
652 return -1;
653 }
654 conn = cmd->conn;
655
656 cmd->iscsi_opcode = ISCSI_OP_REJECT;
657 if (fail_conn)
658 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
659
660 hdr = (struct iscsi_reject *) cmd->pdu;
661 hdr->reason = reason;
662
663 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
664 if (!cmd->buf_ptr) {
665 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
666 iscsit_release_cmd(cmd);
667 return -1;
668 }
669
670 if (add_to_conn) {
671 spin_lock_bh(&conn->cmd_lock);
672 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
673 spin_unlock_bh(&conn->cmd_lock);
674 }
675
676 cmd->i_state = ISTATE_SEND_REJECT;
677 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
678
679 ret = wait_for_completion_interruptible(&cmd->reject_comp);
680 if (ret != 0)
681 return -1;
682
683 return (!fail_conn) ? 0 : -1;
684 }
685
686 /*
687 * Map some portion of the allocated scatterlist to an iovec, suitable for
688 * kernel sockets to copy data in/out. This handles both pages and slab-allocated
689 * buffers, since we have been tricky and mapped t_mem_sg to the buffer in
690 * either case (see iscsit_alloc_buffs)
691 */
692 static int iscsit_map_iovec(
693 struct iscsi_cmd *cmd,
694 struct kvec *iov,
695 u32 data_offset,
696 u32 data_length)
697 {
698 u32 i = 0;
699 struct scatterlist *sg;
700 unsigned int page_off;
701
702 /*
703 * We have a private mapping of the allocated pages in t_mem_sg.
704 * At this point, we also know each contains a page.
705 */
706 sg = &cmd->t_mem_sg[data_offset / PAGE_SIZE];
707 page_off = (data_offset % PAGE_SIZE);
708
709 cmd->first_data_sg = sg;
710 cmd->first_data_sg_off = page_off;
711
712 while (data_length) {
713 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
714
715 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
716 iov[i].iov_len = cur_len;
717
718 data_length -= cur_len;
719 page_off = 0;
720 sg = sg_next(sg);
721 i++;
722 }
723
724 cmd->kmapped_nents = i;
725
726 return i;
727 }
728
729 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
730 {
731 u32 i;
732 struct scatterlist *sg;
733
734 sg = cmd->first_data_sg;
735
736 for (i = 0; i < cmd->kmapped_nents; i++)
737 kunmap(sg_page(&sg[i]));
738 }
739
740 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
741 {
742 struct iscsi_cmd *cmd;
743
744 conn->exp_statsn = exp_statsn;
745
746 spin_lock_bh(&conn->cmd_lock);
747 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
748 spin_lock(&cmd->istate_lock);
749 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
750 (cmd->stat_sn < exp_statsn)) {
751 cmd->i_state = ISTATE_REMOVE;
752 spin_unlock(&cmd->istate_lock);
753 iscsit_add_cmd_to_immediate_queue(cmd, conn,
754 cmd->i_state);
755 continue;
756 }
757 spin_unlock(&cmd->istate_lock);
758 }
759 spin_unlock_bh(&conn->cmd_lock);
760 }
761
762 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
763 {
764 u32 iov_count = (cmd->se_cmd.t_data_nents == 0) ? 1 :
765 cmd->se_cmd.t_data_nents;
766
767 iov_count += ISCSI_IOV_DATA_BUFFER;
768
769 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
770 if (!cmd->iov_data) {
771 pr_err("Unable to allocate cmd->iov_data\n");
772 return -ENOMEM;
773 }
774
775 cmd->orig_iov_data_count = iov_count;
776 return 0;
777 }
778
779 static int iscsit_alloc_buffs(struct iscsi_cmd *cmd)
780 {
781 struct scatterlist *sgl;
782 u32 length = cmd->se_cmd.data_length;
783 int nents = DIV_ROUND_UP(length, PAGE_SIZE);
784 int i = 0, ret;
785 /*
786 * If no SCSI payload is present, allocate the default iovecs used for
787 * iSCSI PDU Header
788 */
789 if (!length)
790 return iscsit_allocate_iovecs(cmd);
791
792 sgl = kzalloc(sizeof(*sgl) * nents, GFP_KERNEL);
793 if (!sgl)
794 return -ENOMEM;
795
796 sg_init_table(sgl, nents);
797
798 while (length) {
799 int buf_size = min_t(int, length, PAGE_SIZE);
800 struct page *page;
801
802 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
803 if (!page)
804 goto page_alloc_failed;
805
806 sg_set_page(&sgl[i], page, buf_size, 0);
807
808 length -= buf_size;
809 i++;
810 }
811
812 cmd->t_mem_sg = sgl;
813 cmd->t_mem_sg_nents = nents;
814
815 /* BIDI ops not supported */
816
817 /* Tell the core about our preallocated memory */
818 transport_generic_map_mem_to_cmd(&cmd->se_cmd, sgl, nents, NULL, 0);
819 /*
820 * Allocate iovecs for SCSI payload after transport_generic_map_mem_to_cmd
821 * so that cmd->se_cmd.t_tasks_se_num has been set.
822 */
823 ret = iscsit_allocate_iovecs(cmd);
824 if (ret < 0)
825 goto page_alloc_failed;
826
827 return 0;
828
829 page_alloc_failed:
830 while (i >= 0) {
831 __free_page(sg_page(&sgl[i]));
832 i--;
833 }
834 kfree(cmd->t_mem_sg);
835 cmd->t_mem_sg = NULL;
836 return -ENOMEM;
837 }
838
839 static int iscsit_handle_scsi_cmd(
840 struct iscsi_conn *conn,
841 unsigned char *buf)
842 {
843 int data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
844 int dump_immediate_data = 0, send_check_condition = 0, payload_length;
845 struct iscsi_cmd *cmd = NULL;
846 struct iscsi_scsi_req *hdr;
847
848 spin_lock_bh(&conn->sess->session_stats_lock);
849 conn->sess->cmd_pdus++;
850 if (conn->sess->se_sess->se_node_acl) {
851 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
852 conn->sess->se_sess->se_node_acl->num_cmds++;
853 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
854 }
855 spin_unlock_bh(&conn->sess->session_stats_lock);
856
857 hdr = (struct iscsi_scsi_req *) buf;
858 payload_length = ntoh24(hdr->dlength);
859 hdr->itt = be32_to_cpu(hdr->itt);
860 hdr->data_length = be32_to_cpu(hdr->data_length);
861 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
862 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
863
864 /* FIXME; Add checks for AdditionalHeaderSegment */
865
866 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
867 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
868 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
869 " not set. Bad iSCSI Initiator.\n");
870 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
871 buf, conn);
872 }
873
874 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
875 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
876 /*
877 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
878 * that adds support for RESERVE/RELEASE. There is a bug
879 * add with this new functionality that sets R/W bits when
880 * neither CDB carries any READ or WRITE datapayloads.
881 */
882 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
883 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
884 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
885 goto done;
886 }
887
888 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
889 " set when Expected Data Transfer Length is 0 for"
890 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
891 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
892 buf, conn);
893 }
894 done:
895
896 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
897 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
898 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
899 " MUST be set if Expected Data Transfer Length is not 0."
900 " Bad iSCSI Initiator\n");
901 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
902 buf, conn);
903 }
904
905 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
906 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
907 pr_err("Bidirectional operations not supported!\n");
908 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
909 buf, conn);
910 }
911
912 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
913 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
914 " Scsi Command PDU.\n");
915 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
916 buf, conn);
917 }
918
919 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
920 pr_err("ImmediateData=No but DataSegmentLength=%u,"
921 " protocol error.\n", payload_length);
922 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
923 buf, conn);
924 }
925
926 if ((hdr->data_length == payload_length) &&
927 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
928 pr_err("Expected Data Transfer Length and Length of"
929 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
930 " bit is not set protocol error\n");
931 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
932 buf, conn);
933 }
934
935 if (payload_length > hdr->data_length) {
936 pr_err("DataSegmentLength: %u is greater than"
937 " EDTL: %u, protocol error.\n", payload_length,
938 hdr->data_length);
939 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
940 buf, conn);
941 }
942
943 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
944 pr_err("DataSegmentLength: %u is greater than"
945 " MaxRecvDataSegmentLength: %u, protocol error.\n",
946 payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
947 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
948 buf, conn);
949 }
950
951 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
952 pr_err("DataSegmentLength: %u is greater than"
953 " FirstBurstLength: %u, protocol error.\n",
954 payload_length, conn->sess->sess_ops->FirstBurstLength);
955 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
956 buf, conn);
957 }
958
959 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
960 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
961 DMA_NONE;
962
963 cmd = iscsit_allocate_se_cmd(conn, hdr->data_length, data_direction,
964 (hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK));
965 if (!cmd)
966 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
967 buf, conn);
968
969 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
970 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
971 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
972
973 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
974 cmd->i_state = ISTATE_NEW_CMD;
975 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
976 cmd->immediate_data = (payload_length) ? 1 : 0;
977 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
978 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
979 if (cmd->unsolicited_data)
980 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
981
982 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
983 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
984 spin_lock_bh(&conn->sess->ttt_lock);
985 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
986 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
987 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
988 spin_unlock_bh(&conn->sess->ttt_lock);
989 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
990 cmd->targ_xfer_tag = 0xFFFFFFFF;
991 cmd->cmd_sn = hdr->cmdsn;
992 cmd->exp_stat_sn = hdr->exp_statsn;
993 cmd->first_burst_len = payload_length;
994
995 if (cmd->data_direction == DMA_FROM_DEVICE) {
996 struct iscsi_datain_req *dr;
997
998 dr = iscsit_allocate_datain_req();
999 if (!dr)
1000 return iscsit_add_reject_from_cmd(
1001 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1002 1, 1, buf, cmd);
1003
1004 iscsit_attach_datain_req(cmd, dr);
1005 }
1006
1007 /*
1008 * The CDB is going to an se_device_t.
1009 */
1010 ret = iscsit_get_lun_for_cmd(cmd, hdr->cdb,
1011 get_unaligned_le64(&hdr->lun));
1012 if (ret < 0) {
1013 if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
1014 pr_debug("Responding to non-acl'ed,"
1015 " non-existent or non-exported iSCSI LUN:"
1016 " 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
1017 }
1018 send_check_condition = 1;
1019 goto attach_cmd;
1020 }
1021 /*
1022 * The Initiator Node has access to the LUN (the addressing method
1023 * is handled inside of iscsit_get_lun_for_cmd()). Now it's time to
1024 * allocate 1->N transport tasks (depending on sector count and
1025 * maximum request size the physical HBA(s) can handle.
1026 */
1027 transport_ret = transport_generic_allocate_tasks(&cmd->se_cmd, hdr->cdb);
1028 if (transport_ret == -ENOMEM) {
1029 return iscsit_add_reject_from_cmd(
1030 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1031 1, 1, buf, cmd);
1032 } else if (transport_ret == -EINVAL) {
1033 /*
1034 * Unsupported SAM Opcode. CHECK_CONDITION will be sent
1035 * in iscsit_execute_cmd() during the CmdSN OOO Execution
1036 * Mechinism.
1037 */
1038 send_check_condition = 1;
1039 } else {
1040 cmd->data_length = cmd->se_cmd.data_length;
1041
1042 if (iscsit_decide_list_to_build(cmd, payload_length) < 0)
1043 return iscsit_add_reject_from_cmd(
1044 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1045 1, 1, buf, cmd);
1046 }
1047
1048 attach_cmd:
1049 spin_lock_bh(&conn->cmd_lock);
1050 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1051 spin_unlock_bh(&conn->cmd_lock);
1052 /*
1053 * Check if we need to delay processing because of ALUA
1054 * Active/NonOptimized primary access state..
1055 */
1056 core_alua_check_nonop_delay(&cmd->se_cmd);
1057 /*
1058 * Allocate and setup SGL used with transport_generic_map_mem_to_cmd().
1059 * also call iscsit_allocate_iovecs()
1060 */
1061 ret = iscsit_alloc_buffs(cmd);
1062 if (ret < 0)
1063 return iscsit_add_reject_from_cmd(
1064 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1065 1, 1, buf, cmd);
1066 /*
1067 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1068 * the Immediate Bit is not set, and no Immediate
1069 * Data is attached.
1070 *
1071 * A PDU/CmdSN carrying Immediate Data can only
1072 * be processed after the DataCRC has passed.
1073 * If the DataCRC fails, the CmdSN MUST NOT
1074 * be acknowledged. (See below)
1075 */
1076 if (!cmd->immediate_data) {
1077 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1078 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1079 return 0;
1080 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1081 return iscsit_add_reject_from_cmd(
1082 ISCSI_REASON_PROTOCOL_ERROR,
1083 1, 0, buf, cmd);
1084 }
1085
1086 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1087
1088 /*
1089 * If no Immediate Data is attached, it's OK to return now.
1090 */
1091 if (!cmd->immediate_data) {
1092 if (send_check_condition)
1093 return 0;
1094
1095 if (cmd->unsolicited_data) {
1096 iscsit_set_dataout_sequence_values(cmd);
1097
1098 spin_lock_bh(&cmd->dataout_timeout_lock);
1099 iscsit_start_dataout_timer(cmd, cmd->conn);
1100 spin_unlock_bh(&cmd->dataout_timeout_lock);
1101 }
1102
1103 return 0;
1104 }
1105
1106 /*
1107 * Early CHECK_CONDITIONs never make it to the transport processing
1108 * thread. They are processed in CmdSN order by
1109 * iscsit_check_received_cmdsn() below.
1110 */
1111 if (send_check_condition) {
1112 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1113 dump_immediate_data = 1;
1114 goto after_immediate_data;
1115 }
1116 /*
1117 * Call directly into transport_generic_new_cmd() to perform
1118 * the backend memory allocation.
1119 */
1120 ret = transport_generic_new_cmd(&cmd->se_cmd);
1121 if (ret < 0) {
1122 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1123 dump_immediate_data = 1;
1124 goto after_immediate_data;
1125 }
1126
1127 immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1128 after_immediate_data:
1129 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1130 /*
1131 * A PDU/CmdSN carrying Immediate Data passed
1132 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1133 * Immediate Bit is not set.
1134 */
1135 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1136 /*
1137 * Special case for Unsupported SAM WRITE Opcodes
1138 * and ImmediateData=Yes.
1139 */
1140 if (dump_immediate_data) {
1141 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1142 return -1;
1143 } else if (cmd->unsolicited_data) {
1144 iscsit_set_dataout_sequence_values(cmd);
1145
1146 spin_lock_bh(&cmd->dataout_timeout_lock);
1147 iscsit_start_dataout_timer(cmd, cmd->conn);
1148 spin_unlock_bh(&cmd->dataout_timeout_lock);
1149 }
1150
1151 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1152 return iscsit_add_reject_from_cmd(
1153 ISCSI_REASON_PROTOCOL_ERROR,
1154 1, 0, buf, cmd);
1155
1156 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1157 /*
1158 * Immediate Data failed DataCRC and ERL>=1,
1159 * silently drop this PDU and let the initiator
1160 * plug the CmdSN gap.
1161 *
1162 * FIXME: Send Unsolicited NOPIN with reserved
1163 * TTT here to help the initiator figure out
1164 * the missing CmdSN, although they should be
1165 * intelligent enough to determine the missing
1166 * CmdSN and issue a retry to plug the sequence.
1167 */
1168 cmd->i_state = ISTATE_REMOVE;
1169 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1170 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1171 return -1;
1172
1173 return 0;
1174 }
1175
1176 static u32 iscsit_do_crypto_hash_sg(
1177 struct hash_desc *hash,
1178 struct iscsi_cmd *cmd,
1179 u32 data_offset,
1180 u32 data_length,
1181 u32 padding,
1182 u8 *pad_bytes)
1183 {
1184 u32 data_crc;
1185 u32 i;
1186 struct scatterlist *sg;
1187 unsigned int page_off;
1188
1189 crypto_hash_init(hash);
1190
1191 sg = cmd->first_data_sg;
1192 page_off = cmd->first_data_sg_off;
1193
1194 i = 0;
1195 while (data_length) {
1196 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1197
1198 crypto_hash_update(hash, &sg[i], cur_len);
1199
1200 data_length -= cur_len;
1201 page_off = 0;
1202 i++;
1203 }
1204
1205 if (padding) {
1206 struct scatterlist pad_sg;
1207
1208 sg_init_one(&pad_sg, pad_bytes, padding);
1209 crypto_hash_update(hash, &pad_sg, padding);
1210 }
1211 crypto_hash_final(hash, (u8 *) &data_crc);
1212
1213 return data_crc;
1214 }
1215
1216 static void iscsit_do_crypto_hash_buf(
1217 struct hash_desc *hash,
1218 unsigned char *buf,
1219 u32 payload_length,
1220 u32 padding,
1221 u8 *pad_bytes,
1222 u8 *data_crc)
1223 {
1224 struct scatterlist sg;
1225
1226 crypto_hash_init(hash);
1227
1228 sg_init_one(&sg, (u8 *)buf, payload_length);
1229 crypto_hash_update(hash, &sg, payload_length);
1230
1231 if (padding) {
1232 sg_init_one(&sg, pad_bytes, padding);
1233 crypto_hash_update(hash, &sg, padding);
1234 }
1235 crypto_hash_final(hash, data_crc);
1236 }
1237
1238 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1239 {
1240 int iov_ret, ooo_cmdsn = 0, ret;
1241 u8 data_crc_failed = 0;
1242 u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1243 u32 rx_size = 0, payload_length;
1244 struct iscsi_cmd *cmd = NULL;
1245 struct se_cmd *se_cmd;
1246 struct iscsi_data *hdr;
1247 struct kvec *iov;
1248 unsigned long flags;
1249
1250 hdr = (struct iscsi_data *) buf;
1251 payload_length = ntoh24(hdr->dlength);
1252 hdr->itt = be32_to_cpu(hdr->itt);
1253 hdr->ttt = be32_to_cpu(hdr->ttt);
1254 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1255 hdr->datasn = be32_to_cpu(hdr->datasn);
1256 hdr->offset = be32_to_cpu(hdr->offset);
1257
1258 if (!payload_length) {
1259 pr_err("DataOUT payload is ZERO, protocol error.\n");
1260 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1261 buf, conn);
1262 }
1263
1264 /* iSCSI write */
1265 spin_lock_bh(&conn->sess->session_stats_lock);
1266 conn->sess->rx_data_octets += payload_length;
1267 if (conn->sess->se_sess->se_node_acl) {
1268 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1269 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1270 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1271 }
1272 spin_unlock_bh(&conn->sess->session_stats_lock);
1273
1274 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1275 pr_err("DataSegmentLength: %u is greater than"
1276 " MaxRecvDataSegmentLength: %u\n", payload_length,
1277 conn->conn_ops->MaxRecvDataSegmentLength);
1278 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1279 buf, conn);
1280 }
1281
1282 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1283 payload_length);
1284 if (!cmd)
1285 return 0;
1286
1287 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1288 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1289 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1290 payload_length, conn->cid);
1291
1292 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1293 pr_err("Command ITT: 0x%08x received DataOUT after"
1294 " last DataOUT received, dumping payload\n",
1295 cmd->init_task_tag);
1296 return iscsit_dump_data_payload(conn, payload_length, 1);
1297 }
1298
1299 if (cmd->data_direction != DMA_TO_DEVICE) {
1300 pr_err("Command ITT: 0x%08x received DataOUT for a"
1301 " NON-WRITE command.\n", cmd->init_task_tag);
1302 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1303 1, 0, buf, cmd);
1304 }
1305 se_cmd = &cmd->se_cmd;
1306 iscsit_mod_dataout_timer(cmd);
1307
1308 if ((hdr->offset + payload_length) > cmd->data_length) {
1309 pr_err("DataOut Offset: %u, Length %u greater than"
1310 " iSCSI Command EDTL %u, protocol error.\n",
1311 hdr->offset, payload_length, cmd->data_length);
1312 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1313 1, 0, buf, cmd);
1314 }
1315
1316 if (cmd->unsolicited_data) {
1317 int dump_unsolicited_data = 0;
1318
1319 if (conn->sess->sess_ops->InitialR2T) {
1320 pr_err("Received unexpected unsolicited data"
1321 " while InitialR2T=Yes, protocol error.\n");
1322 transport_send_check_condition_and_sense(&cmd->se_cmd,
1323 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1324 return -1;
1325 }
1326 /*
1327 * Special case for dealing with Unsolicited DataOUT
1328 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1329 * failures;
1330 */
1331
1332 /* Something's amiss if we're not in WRITE_PENDING state... */
1333 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1334 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1335 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1336
1337 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1338 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1339 (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION))
1340 dump_unsolicited_data = 1;
1341 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1342
1343 if (dump_unsolicited_data) {
1344 /*
1345 * Check if a delayed TASK_ABORTED status needs to
1346 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1347 * received with the unsolicitied data out.
1348 */
1349 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1350 iscsit_stop_dataout_timer(cmd);
1351
1352 transport_check_aborted_status(se_cmd,
1353 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1354 return iscsit_dump_data_payload(conn, payload_length, 1);
1355 }
1356 } else {
1357 /*
1358 * For the normal solicited data path:
1359 *
1360 * Check for a delayed TASK_ABORTED status and dump any
1361 * incoming data out payload if one exists. Also, when the
1362 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1363 * data out sequence, we decrement outstanding_r2ts. Once
1364 * outstanding_r2ts reaches zero, go ahead and send the delayed
1365 * TASK_ABORTED status.
1366 */
1367 if (atomic_read(&se_cmd->t_transport_aborted) != 0) {
1368 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1369 if (--cmd->outstanding_r2ts < 1) {
1370 iscsit_stop_dataout_timer(cmd);
1371 transport_check_aborted_status(
1372 se_cmd, 1);
1373 }
1374
1375 return iscsit_dump_data_payload(conn, payload_length, 1);
1376 }
1377 }
1378 /*
1379 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1380 * within-command recovery checks before receiving the payload.
1381 */
1382 ret = iscsit_check_pre_dataout(cmd, buf);
1383 if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1384 return 0;
1385 else if (ret == DATAOUT_CANNOT_RECOVER)
1386 return -1;
1387
1388 rx_size += payload_length;
1389 iov = &cmd->iov_data[0];
1390
1391 iov_ret = iscsit_map_iovec(cmd, iov, hdr->offset, payload_length);
1392 if (iov_ret < 0)
1393 return -1;
1394
1395 iov_count += iov_ret;
1396
1397 padding = ((-payload_length) & 3);
1398 if (padding != 0) {
1399 iov[iov_count].iov_base = cmd->pad_bytes;
1400 iov[iov_count++].iov_len = padding;
1401 rx_size += padding;
1402 pr_debug("Receiving %u padding bytes.\n", padding);
1403 }
1404
1405 if (conn->conn_ops->DataDigest) {
1406 iov[iov_count].iov_base = &checksum;
1407 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1408 rx_size += ISCSI_CRC_LEN;
1409 }
1410
1411 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1412
1413 iscsit_unmap_iovec(cmd);
1414
1415 if (rx_got != rx_size)
1416 return -1;
1417
1418 if (conn->conn_ops->DataDigest) {
1419 u32 data_crc;
1420
1421 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1422 hdr->offset, payload_length, padding,
1423 cmd->pad_bytes);
1424
1425 if (checksum != data_crc) {
1426 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1427 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1428 " does not match computed 0x%08x\n",
1429 hdr->itt, hdr->offset, payload_length,
1430 hdr->datasn, checksum, data_crc);
1431 data_crc_failed = 1;
1432 } else {
1433 pr_debug("Got CRC32C DataDigest 0x%08x for"
1434 " %u bytes of Data Out\n", checksum,
1435 payload_length);
1436 }
1437 }
1438 /*
1439 * Increment post receive data and CRC values or perform
1440 * within-command recovery.
1441 */
1442 ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1443 if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1444 return 0;
1445 else if (ret == DATAOUT_SEND_R2T) {
1446 iscsit_set_dataout_sequence_values(cmd);
1447 iscsit_build_r2ts_for_cmd(cmd, conn, 0);
1448 } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1449 /*
1450 * Handle extra special case for out of order
1451 * Unsolicited Data Out.
1452 */
1453 spin_lock_bh(&cmd->istate_lock);
1454 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1455 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1456 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1457 spin_unlock_bh(&cmd->istate_lock);
1458
1459 iscsit_stop_dataout_timer(cmd);
1460 return (!ooo_cmdsn) ? transport_generic_handle_data(
1461 &cmd->se_cmd) : 0;
1462 } else /* DATAOUT_CANNOT_RECOVER */
1463 return -1;
1464
1465 return 0;
1466 }
1467
1468 static int iscsit_handle_nop_out(
1469 struct iscsi_conn *conn,
1470 unsigned char *buf)
1471 {
1472 unsigned char *ping_data = NULL;
1473 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1474 u32 checksum, data_crc, padding = 0, payload_length;
1475 u64 lun;
1476 struct iscsi_cmd *cmd = NULL;
1477 struct kvec *iov = NULL;
1478 struct iscsi_nopout *hdr;
1479
1480 hdr = (struct iscsi_nopout *) buf;
1481 payload_length = ntoh24(hdr->dlength);
1482 lun = get_unaligned_le64(&hdr->lun);
1483 hdr->itt = be32_to_cpu(hdr->itt);
1484 hdr->ttt = be32_to_cpu(hdr->ttt);
1485 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1486 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1487
1488 if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1489 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1490 " not set, protocol error.\n");
1491 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1492 buf, conn);
1493 }
1494
1495 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1496 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1497 " greater than MaxRecvDataSegmentLength: %u, protocol"
1498 " error.\n", payload_length,
1499 conn->conn_ops->MaxRecvDataSegmentLength);
1500 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1501 buf, conn);
1502 }
1503
1504 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1505 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1506 (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
1507 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1508 payload_length);
1509 /*
1510 * This is not a response to a Unsolicited NopIN, which means
1511 * it can either be a NOPOUT ping request (with a valid ITT),
1512 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1513 * Either way, make sure we allocate an struct iscsi_cmd, as both
1514 * can contain ping data.
1515 */
1516 if (hdr->ttt == 0xFFFFFFFF) {
1517 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1518 if (!cmd)
1519 return iscsit_add_reject(
1520 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1521 1, buf, conn);
1522
1523 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1524 cmd->i_state = ISTATE_SEND_NOPIN;
1525 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1526 1 : 0);
1527 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1528 cmd->targ_xfer_tag = 0xFFFFFFFF;
1529 cmd->cmd_sn = hdr->cmdsn;
1530 cmd->exp_stat_sn = hdr->exp_statsn;
1531 cmd->data_direction = DMA_NONE;
1532 }
1533
1534 if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
1535 rx_size = payload_length;
1536 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1537 if (!ping_data) {
1538 pr_err("Unable to allocate memory for"
1539 " NOPOUT ping data.\n");
1540 ret = -1;
1541 goto out;
1542 }
1543
1544 iov = &cmd->iov_misc[0];
1545 iov[niov].iov_base = ping_data;
1546 iov[niov++].iov_len = payload_length;
1547
1548 padding = ((-payload_length) & 3);
1549 if (padding != 0) {
1550 pr_debug("Receiving %u additional bytes"
1551 " for padding.\n", padding);
1552 iov[niov].iov_base = &cmd->pad_bytes;
1553 iov[niov++].iov_len = padding;
1554 rx_size += padding;
1555 }
1556 if (conn->conn_ops->DataDigest) {
1557 iov[niov].iov_base = &checksum;
1558 iov[niov++].iov_len = ISCSI_CRC_LEN;
1559 rx_size += ISCSI_CRC_LEN;
1560 }
1561
1562 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1563 if (rx_got != rx_size) {
1564 ret = -1;
1565 goto out;
1566 }
1567
1568 if (conn->conn_ops->DataDigest) {
1569 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1570 ping_data, payload_length,
1571 padding, cmd->pad_bytes,
1572 (u8 *)&data_crc);
1573
1574 if (checksum != data_crc) {
1575 pr_err("Ping data CRC32C DataDigest"
1576 " 0x%08x does not match computed 0x%08x\n",
1577 checksum, data_crc);
1578 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1579 pr_err("Unable to recover from"
1580 " NOPOUT Ping DataCRC failure while in"
1581 " ERL=0.\n");
1582 ret = -1;
1583 goto out;
1584 } else {
1585 /*
1586 * Silently drop this PDU and let the
1587 * initiator plug the CmdSN gap.
1588 */
1589 pr_debug("Dropping NOPOUT"
1590 " Command CmdSN: 0x%08x due to"
1591 " DataCRC error.\n", hdr->cmdsn);
1592 ret = 0;
1593 goto out;
1594 }
1595 } else {
1596 pr_debug("Got CRC32C DataDigest"
1597 " 0x%08x for %u bytes of ping data.\n",
1598 checksum, payload_length);
1599 }
1600 }
1601
1602 ping_data[payload_length] = '\0';
1603 /*
1604 * Attach ping data to struct iscsi_cmd->buf_ptr.
1605 */
1606 cmd->buf_ptr = (void *)ping_data;
1607 cmd->buf_ptr_size = payload_length;
1608
1609 pr_debug("Got %u bytes of NOPOUT ping"
1610 " data.\n", payload_length);
1611 pr_debug("Ping Data: \"%s\"\n", ping_data);
1612 }
1613
1614 if (hdr->itt != 0xFFFFFFFF) {
1615 if (!cmd) {
1616 pr_err("Checking CmdSN for NOPOUT,"
1617 " but cmd is NULL!\n");
1618 return -1;
1619 }
1620 /*
1621 * Initiator is expecting a NopIN ping reply,
1622 */
1623 spin_lock_bh(&conn->cmd_lock);
1624 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1625 spin_unlock_bh(&conn->cmd_lock);
1626
1627 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1628
1629 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1630 iscsit_add_cmd_to_response_queue(cmd, conn,
1631 cmd->i_state);
1632 return 0;
1633 }
1634
1635 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1636 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1637 ret = 0;
1638 goto ping_out;
1639 }
1640 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1641 return iscsit_add_reject_from_cmd(
1642 ISCSI_REASON_PROTOCOL_ERROR,
1643 1, 0, buf, cmd);
1644
1645 return 0;
1646 }
1647
1648 if (hdr->ttt != 0xFFFFFFFF) {
1649 /*
1650 * This was a response to a unsolicited NOPIN ping.
1651 */
1652 cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
1653 if (!cmd)
1654 return -1;
1655
1656 iscsit_stop_nopin_response_timer(conn);
1657
1658 cmd->i_state = ISTATE_REMOVE;
1659 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1660 iscsit_start_nopin_timer(conn);
1661 } else {
1662 /*
1663 * Initiator is not expecting a NOPIN is response.
1664 * Just ignore for now.
1665 *
1666 * iSCSI v19-91 10.18
1667 * "A NOP-OUT may also be used to confirm a changed
1668 * ExpStatSN if another PDU will not be available
1669 * for a long time."
1670 */
1671 ret = 0;
1672 goto out;
1673 }
1674
1675 return 0;
1676 out:
1677 if (cmd)
1678 iscsit_release_cmd(cmd);
1679 ping_out:
1680 kfree(ping_data);
1681 return ret;
1682 }
1683
1684 static int iscsit_handle_task_mgt_cmd(
1685 struct iscsi_conn *conn,
1686 unsigned char *buf)
1687 {
1688 struct iscsi_cmd *cmd;
1689 struct se_tmr_req *se_tmr;
1690 struct iscsi_tmr_req *tmr_req;
1691 struct iscsi_tm *hdr;
1692 u32 payload_length;
1693 int out_of_order_cmdsn = 0;
1694 int ret;
1695 u8 function;
1696
1697 hdr = (struct iscsi_tm *) buf;
1698 payload_length = ntoh24(hdr->dlength);
1699 hdr->itt = be32_to_cpu(hdr->itt);
1700 hdr->rtt = be32_to_cpu(hdr->rtt);
1701 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1702 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1703 hdr->refcmdsn = be32_to_cpu(hdr->refcmdsn);
1704 hdr->exp_datasn = be32_to_cpu(hdr->exp_datasn);
1705 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1706 function = hdr->flags;
1707
1708 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1709 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1710 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1711 hdr->rtt, hdr->refcmdsn, conn->cid);
1712
1713 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1714 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1715 (hdr->rtt != ISCSI_RESERVED_TAG))) {
1716 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1717 hdr->rtt = ISCSI_RESERVED_TAG;
1718 }
1719
1720 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1721 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1722 pr_err("Task Management Request TASK_REASSIGN not"
1723 " issued as immediate command, bad iSCSI Initiator"
1724 "implementation\n");
1725 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1726 buf, conn);
1727 }
1728 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1729 (hdr->refcmdsn != ISCSI_RESERVED_TAG))
1730 hdr->refcmdsn = ISCSI_RESERVED_TAG;
1731
1732 cmd = iscsit_allocate_se_cmd_for_tmr(conn, function);
1733 if (!cmd)
1734 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1735 1, buf, conn);
1736
1737 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1738 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1739 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1740 cmd->init_task_tag = hdr->itt;
1741 cmd->targ_xfer_tag = 0xFFFFFFFF;
1742 cmd->cmd_sn = hdr->cmdsn;
1743 cmd->exp_stat_sn = hdr->exp_statsn;
1744 se_tmr = cmd->se_cmd.se_tmr_req;
1745 tmr_req = cmd->tmr_req;
1746 /*
1747 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1748 */
1749 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1750 ret = iscsit_get_lun_for_tmr(cmd,
1751 get_unaligned_le64(&hdr->lun));
1752 if (ret < 0) {
1753 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1754 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1755 goto attach;
1756 }
1757 }
1758
1759 switch (function) {
1760 case ISCSI_TM_FUNC_ABORT_TASK:
1761 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1762 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1763 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1764 goto attach;
1765 }
1766 break;
1767 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1768 case ISCSI_TM_FUNC_CLEAR_ACA:
1769 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1770 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1771 break;
1772 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1773 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1774 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1775 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1776 goto attach;
1777 }
1778 break;
1779 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1780 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1781 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1782 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1783 goto attach;
1784 }
1785 break;
1786 case ISCSI_TM_FUNC_TASK_REASSIGN:
1787 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1788 /*
1789 * Perform sanity checks on the ExpDataSN only if the
1790 * TASK_REASSIGN was successful.
1791 */
1792 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1793 break;
1794
1795 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1796 return iscsit_add_reject_from_cmd(
1797 ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1798 buf, cmd);
1799 break;
1800 default:
1801 pr_err("Unknown TMR function: 0x%02x, protocol"
1802 " error.\n", function);
1803 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1804 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1805 goto attach;
1806 }
1807
1808 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1809 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1810 se_tmr->call_transport = 1;
1811 attach:
1812 spin_lock_bh(&conn->cmd_lock);
1813 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1814 spin_unlock_bh(&conn->cmd_lock);
1815
1816 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1817 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1818 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1819 out_of_order_cmdsn = 1;
1820 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1821 return 0;
1822 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1823 return iscsit_add_reject_from_cmd(
1824 ISCSI_REASON_PROTOCOL_ERROR,
1825 1, 0, buf, cmd);
1826 }
1827 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1828
1829 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1830 return 0;
1831 /*
1832 * Found the referenced task, send to transport for processing.
1833 */
1834 if (se_tmr->call_transport)
1835 return transport_generic_handle_tmr(&cmd->se_cmd);
1836
1837 /*
1838 * Could not find the referenced LUN, task, or Task Management
1839 * command not authorized or supported. Change state and
1840 * let the tx_thread send the response.
1841 *
1842 * For connection recovery, this is also the default action for
1843 * TMR TASK_REASSIGN.
1844 */
1845 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1846 return 0;
1847 }
1848
1849 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1850 static int iscsit_handle_text_cmd(
1851 struct iscsi_conn *conn,
1852 unsigned char *buf)
1853 {
1854 char *text_ptr, *text_in;
1855 int cmdsn_ret, niov = 0, rx_got, rx_size;
1856 u32 checksum = 0, data_crc = 0, payload_length;
1857 u32 padding = 0, pad_bytes = 0, text_length = 0;
1858 struct iscsi_cmd *cmd;
1859 struct kvec iov[3];
1860 struct iscsi_text *hdr;
1861
1862 hdr = (struct iscsi_text *) buf;
1863 payload_length = ntoh24(hdr->dlength);
1864 hdr->itt = be32_to_cpu(hdr->itt);
1865 hdr->ttt = be32_to_cpu(hdr->ttt);
1866 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1867 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1868
1869 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1870 pr_err("Unable to accept text parameter length: %u"
1871 "greater than MaxRecvDataSegmentLength %u.\n",
1872 payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
1873 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1874 buf, conn);
1875 }
1876
1877 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1878 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1879 hdr->exp_statsn, payload_length);
1880
1881 rx_size = text_length = payload_length;
1882 if (text_length) {
1883 text_in = kzalloc(text_length, GFP_KERNEL);
1884 if (!text_in) {
1885 pr_err("Unable to allocate memory for"
1886 " incoming text parameters\n");
1887 return -1;
1888 }
1889
1890 memset(iov, 0, 3 * sizeof(struct kvec));
1891 iov[niov].iov_base = text_in;
1892 iov[niov++].iov_len = text_length;
1893
1894 padding = ((-payload_length) & 3);
1895 if (padding != 0) {
1896 iov[niov].iov_base = &pad_bytes;
1897 iov[niov++].iov_len = padding;
1898 rx_size += padding;
1899 pr_debug("Receiving %u additional bytes"
1900 " for padding.\n", padding);
1901 }
1902 if (conn->conn_ops->DataDigest) {
1903 iov[niov].iov_base = &checksum;
1904 iov[niov++].iov_len = ISCSI_CRC_LEN;
1905 rx_size += ISCSI_CRC_LEN;
1906 }
1907
1908 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1909 if (rx_got != rx_size) {
1910 kfree(text_in);
1911 return -1;
1912 }
1913
1914 if (conn->conn_ops->DataDigest) {
1915 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1916 text_in, text_length,
1917 padding, (u8 *)&pad_bytes,
1918 (u8 *)&data_crc);
1919
1920 if (checksum != data_crc) {
1921 pr_err("Text data CRC32C DataDigest"
1922 " 0x%08x does not match computed"
1923 " 0x%08x\n", checksum, data_crc);
1924 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1925 pr_err("Unable to recover from"
1926 " Text Data digest failure while in"
1927 " ERL=0.\n");
1928 kfree(text_in);
1929 return -1;
1930 } else {
1931 /*
1932 * Silently drop this PDU and let the
1933 * initiator plug the CmdSN gap.
1934 */
1935 pr_debug("Dropping Text"
1936 " Command CmdSN: 0x%08x due to"
1937 " DataCRC error.\n", hdr->cmdsn);
1938 kfree(text_in);
1939 return 0;
1940 }
1941 } else {
1942 pr_debug("Got CRC32C DataDigest"
1943 " 0x%08x for %u bytes of text data.\n",
1944 checksum, text_length);
1945 }
1946 }
1947 text_in[text_length - 1] = '\0';
1948 pr_debug("Successfully read %d bytes of text"
1949 " data.\n", text_length);
1950
1951 if (strncmp("SendTargets", text_in, 11) != 0) {
1952 pr_err("Received Text Data that is not"
1953 " SendTargets, cannot continue.\n");
1954 kfree(text_in);
1955 return -1;
1956 }
1957 text_ptr = strchr(text_in, '=');
1958 if (!text_ptr) {
1959 pr_err("No \"=\" separator found in Text Data,"
1960 " cannot continue.\n");
1961 kfree(text_in);
1962 return -1;
1963 }
1964 if (strncmp("=All", text_ptr, 4) != 0) {
1965 pr_err("Unable to locate All value for"
1966 " SendTargets key, cannot continue.\n");
1967 kfree(text_in);
1968 return -1;
1969 }
1970 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1971 kfree(text_in);
1972 }
1973
1974 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1975 if (!cmd)
1976 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1977 1, buf, conn);
1978
1979 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1980 cmd->i_state = ISTATE_SEND_TEXTRSP;
1981 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1982 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1983 cmd->targ_xfer_tag = 0xFFFFFFFF;
1984 cmd->cmd_sn = hdr->cmdsn;
1985 cmd->exp_stat_sn = hdr->exp_statsn;
1986 cmd->data_direction = DMA_NONE;
1987
1988 spin_lock_bh(&conn->cmd_lock);
1989 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1990 spin_unlock_bh(&conn->cmd_lock);
1991
1992 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1993
1994 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1995 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1996 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1997 return iscsit_add_reject_from_cmd(
1998 ISCSI_REASON_PROTOCOL_ERROR,
1999 1, 0, buf, cmd);
2000
2001 return 0;
2002 }
2003
2004 return iscsit_execute_cmd(cmd, 0);
2005 }
2006
2007 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2008 {
2009 struct iscsi_conn *conn_p;
2010 struct iscsi_session *sess = conn->sess;
2011
2012 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2013 " for SID: %u.\n", conn->cid, conn->sess->sid);
2014
2015 atomic_set(&sess->session_logout, 1);
2016 atomic_set(&conn->conn_logout_remove, 1);
2017 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2018
2019 iscsit_inc_conn_usage_count(conn);
2020 iscsit_inc_session_usage_count(sess);
2021
2022 spin_lock_bh(&sess->conn_lock);
2023 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2024 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2025 continue;
2026
2027 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2028 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2029 }
2030 spin_unlock_bh(&sess->conn_lock);
2031
2032 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2033
2034 return 0;
2035 }
2036
2037 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2038 {
2039 struct iscsi_conn *l_conn;
2040 struct iscsi_session *sess = conn->sess;
2041
2042 pr_debug("Received logout request CLOSECONNECTION for CID:"
2043 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2044
2045 /*
2046 * A Logout Request with a CLOSECONNECTION reason code for a CID
2047 * can arrive on a connection with a differing CID.
2048 */
2049 if (conn->cid == cmd->logout_cid) {
2050 spin_lock_bh(&conn->state_lock);
2051 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2052 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2053
2054 atomic_set(&conn->conn_logout_remove, 1);
2055 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2056 iscsit_inc_conn_usage_count(conn);
2057
2058 spin_unlock_bh(&conn->state_lock);
2059 } else {
2060 /*
2061 * Handle all different cid CLOSECONNECTION requests in
2062 * iscsit_logout_post_handler_diffcid() as to give enough
2063 * time for any non immediate command's CmdSN to be
2064 * acknowledged on the connection in question.
2065 *
2066 * Here we simply make sure the CID is still around.
2067 */
2068 l_conn = iscsit_get_conn_from_cid(sess,
2069 cmd->logout_cid);
2070 if (!l_conn) {
2071 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2072 iscsit_add_cmd_to_response_queue(cmd, conn,
2073 cmd->i_state);
2074 return 0;
2075 }
2076
2077 iscsit_dec_conn_usage_count(l_conn);
2078 }
2079
2080 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2081
2082 return 0;
2083 }
2084
2085 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2086 {
2087 struct iscsi_session *sess = conn->sess;
2088
2089 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2090 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2091
2092 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2093 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2094 " while ERL!=2.\n");
2095 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2096 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2097 return 0;
2098 }
2099
2100 if (conn->cid == cmd->logout_cid) {
2101 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2102 " with CID: %hu on CID: %hu, implementation error.\n",
2103 cmd->logout_cid, conn->cid);
2104 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2105 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2106 return 0;
2107 }
2108
2109 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2110
2111 return 0;
2112 }
2113
2114 static int iscsit_handle_logout_cmd(
2115 struct iscsi_conn *conn,
2116 unsigned char *buf)
2117 {
2118 int cmdsn_ret, logout_remove = 0;
2119 u8 reason_code = 0;
2120 struct iscsi_cmd *cmd;
2121 struct iscsi_logout *hdr;
2122 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2123
2124 hdr = (struct iscsi_logout *) buf;
2125 reason_code = (hdr->flags & 0x7f);
2126 hdr->itt = be32_to_cpu(hdr->itt);
2127 hdr->cid = be16_to_cpu(hdr->cid);
2128 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
2129 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2130
2131 if (tiqn) {
2132 spin_lock(&tiqn->logout_stats.lock);
2133 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2134 tiqn->logout_stats.normal_logouts++;
2135 else
2136 tiqn->logout_stats.abnormal_logouts++;
2137 spin_unlock(&tiqn->logout_stats.lock);
2138 }
2139
2140 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2141 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2142 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2143 hdr->cid, conn->cid);
2144
2145 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2146 pr_err("Received logout request on connection that"
2147 " is not in logged in state, ignoring request.\n");
2148 return 0;
2149 }
2150
2151 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2152 if (!cmd)
2153 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2154 buf, conn);
2155
2156 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2157 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2158 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2159 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2160 cmd->targ_xfer_tag = 0xFFFFFFFF;
2161 cmd->cmd_sn = hdr->cmdsn;
2162 cmd->exp_stat_sn = hdr->exp_statsn;
2163 cmd->logout_cid = hdr->cid;
2164 cmd->logout_reason = reason_code;
2165 cmd->data_direction = DMA_NONE;
2166
2167 /*
2168 * We need to sleep in these cases (by returning 1) until the Logout
2169 * Response gets sent in the tx thread.
2170 */
2171 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2172 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2173 (hdr->cid == conn->cid)))
2174 logout_remove = 1;
2175
2176 spin_lock_bh(&conn->cmd_lock);
2177 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
2178 spin_unlock_bh(&conn->cmd_lock);
2179
2180 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2181 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2182
2183 /*
2184 * Immediate commands are executed, well, immediately.
2185 * Non-Immediate Logout Commands are executed in CmdSN order.
2186 */
2187 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
2188 int ret = iscsit_execute_cmd(cmd, 0);
2189
2190 if (ret < 0)
2191 return ret;
2192 } else {
2193 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2194 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2195 logout_remove = 0;
2196 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2197 return iscsit_add_reject_from_cmd(
2198 ISCSI_REASON_PROTOCOL_ERROR,
2199 1, 0, buf, cmd);
2200 }
2201 }
2202
2203 return logout_remove;
2204 }
2205
2206 static int iscsit_handle_snack(
2207 struct iscsi_conn *conn,
2208 unsigned char *buf)
2209 {
2210 u32 unpacked_lun;
2211 u64 lun;
2212 struct iscsi_snack *hdr;
2213
2214 hdr = (struct iscsi_snack *) buf;
2215 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2216 lun = get_unaligned_le64(&hdr->lun);
2217 unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
2218 hdr->itt = be32_to_cpu(hdr->itt);
2219 hdr->ttt = be32_to_cpu(hdr->ttt);
2220 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2221 hdr->begrun = be32_to_cpu(hdr->begrun);
2222 hdr->runlength = be32_to_cpu(hdr->runlength);
2223
2224 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2225 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2226 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2227 hdr->begrun, hdr->runlength, conn->cid);
2228
2229 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2230 pr_err("Initiator sent SNACK request while in"
2231 " ErrorRecoveryLevel=0.\n");
2232 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2233 buf, conn);
2234 }
2235 /*
2236 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2237 * call from inside iscsi_send_recovery_datain_or_r2t().
2238 */
2239 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2240 case 0:
2241 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2242 hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
2243 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2244 return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
2245 hdr->begrun, hdr->runlength);
2246 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2247 return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
2248 hdr->runlength);
2249 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2250 /* FIXME: Support R-Data SNACK */
2251 pr_err("R-Data SNACK Not Supported.\n");
2252 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2253 buf, conn);
2254 default:
2255 pr_err("Unknown SNACK type 0x%02x, protocol"
2256 " error.\n", hdr->flags & 0x0f);
2257 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2258 buf, conn);
2259 }
2260
2261 return 0;
2262 }
2263
2264 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2265 {
2266 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2267 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2268 wait_for_completion_interruptible_timeout(
2269 &conn->rx_half_close_comp,
2270 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2271 }
2272 }
2273
2274 static int iscsit_handle_immediate_data(
2275 struct iscsi_cmd *cmd,
2276 unsigned char *buf,
2277 u32 length)
2278 {
2279 int iov_ret, rx_got = 0, rx_size = 0;
2280 u32 checksum, iov_count = 0, padding = 0;
2281 struct iscsi_conn *conn = cmd->conn;
2282 struct kvec *iov;
2283
2284 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2285 if (iov_ret < 0)
2286 return IMMEDIATE_DATA_CANNOT_RECOVER;
2287
2288 rx_size = length;
2289 iov_count = iov_ret;
2290 iov = &cmd->iov_data[0];
2291
2292 padding = ((-length) & 3);
2293 if (padding != 0) {
2294 iov[iov_count].iov_base = cmd->pad_bytes;
2295 iov[iov_count++].iov_len = padding;
2296 rx_size += padding;
2297 }
2298
2299 if (conn->conn_ops->DataDigest) {
2300 iov[iov_count].iov_base = &checksum;
2301 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2302 rx_size += ISCSI_CRC_LEN;
2303 }
2304
2305 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2306
2307 iscsit_unmap_iovec(cmd);
2308
2309 if (rx_got != rx_size) {
2310 iscsit_rx_thread_wait_for_tcp(conn);
2311 return IMMEDIATE_DATA_CANNOT_RECOVER;
2312 }
2313
2314 if (conn->conn_ops->DataDigest) {
2315 u32 data_crc;
2316
2317 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2318 cmd->write_data_done, length, padding,
2319 cmd->pad_bytes);
2320
2321 if (checksum != data_crc) {
2322 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2323 " does not match computed 0x%08x\n", checksum,
2324 data_crc);
2325
2326 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2327 pr_err("Unable to recover from"
2328 " Immediate Data digest failure while"
2329 " in ERL=0.\n");
2330 iscsit_add_reject_from_cmd(
2331 ISCSI_REASON_DATA_DIGEST_ERROR,
2332 1, 0, buf, cmd);
2333 return IMMEDIATE_DATA_CANNOT_RECOVER;
2334 } else {
2335 iscsit_add_reject_from_cmd(
2336 ISCSI_REASON_DATA_DIGEST_ERROR,
2337 0, 0, buf, cmd);
2338 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2339 }
2340 } else {
2341 pr_debug("Got CRC32C DataDigest 0x%08x for"
2342 " %u bytes of Immediate Data\n", checksum,
2343 length);
2344 }
2345 }
2346
2347 cmd->write_data_done += length;
2348
2349 if (cmd->write_data_done == cmd->data_length) {
2350 spin_lock_bh(&cmd->istate_lock);
2351 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2352 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2353 spin_unlock_bh(&cmd->istate_lock);
2354 }
2355
2356 return IMMEDIATE_DATA_NORMAL_OPERATION;
2357 }
2358
2359 /*
2360 * Called with sess->conn_lock held.
2361 */
2362 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2363 with active network interface */
2364 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2365 {
2366 struct iscsi_cmd *cmd;
2367 struct iscsi_conn *conn_p;
2368
2369 /*
2370 * Only send a Asynchronous Message on connections whos network
2371 * interface is still functional.
2372 */
2373 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2374 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2375 iscsit_inc_conn_usage_count(conn_p);
2376 break;
2377 }
2378 }
2379
2380 if (!conn_p)
2381 return;
2382
2383 cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
2384 if (!cmd) {
2385 iscsit_dec_conn_usage_count(conn_p);
2386 return;
2387 }
2388
2389 cmd->logout_cid = conn->cid;
2390 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2391 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2392
2393 spin_lock_bh(&conn_p->cmd_lock);
2394 list_add_tail(&cmd->i_list, &conn_p->conn_cmd_list);
2395 spin_unlock_bh(&conn_p->cmd_lock);
2396
2397 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2398 iscsit_dec_conn_usage_count(conn_p);
2399 }
2400
2401 static int iscsit_send_conn_drop_async_message(
2402 struct iscsi_cmd *cmd,
2403 struct iscsi_conn *conn)
2404 {
2405 struct iscsi_async *hdr;
2406
2407 cmd->tx_size = ISCSI_HDR_LEN;
2408 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2409
2410 hdr = (struct iscsi_async *) cmd->pdu;
2411 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2412 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2413 cmd->init_task_tag = 0xFFFFFFFF;
2414 cmd->targ_xfer_tag = 0xFFFFFFFF;
2415 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2416 cmd->stat_sn = conn->stat_sn++;
2417 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2418 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2419 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2420 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2421 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2422 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2423 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2424
2425 if (conn->conn_ops->HeaderDigest) {
2426 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2427
2428 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2429 (unsigned char *)hdr, ISCSI_HDR_LEN,
2430 0, NULL, (u8 *)header_digest);
2431
2432 cmd->tx_size += ISCSI_CRC_LEN;
2433 pr_debug("Attaching CRC32C HeaderDigest to"
2434 " Async Message 0x%08x\n", *header_digest);
2435 }
2436
2437 cmd->iov_misc[0].iov_base = cmd->pdu;
2438 cmd->iov_misc[0].iov_len = cmd->tx_size;
2439 cmd->iov_misc_count = 1;
2440
2441 pr_debug("Sending Connection Dropped Async Message StatSN:"
2442 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2443 cmd->logout_cid, conn->cid);
2444 return 0;
2445 }
2446
2447 static int iscsit_send_data_in(
2448 struct iscsi_cmd *cmd,
2449 struct iscsi_conn *conn,
2450 int *eodr)
2451 {
2452 int iov_ret = 0, set_statsn = 0;
2453 u32 iov_count = 0, tx_size = 0;
2454 struct iscsi_datain datain;
2455 struct iscsi_datain_req *dr;
2456 struct iscsi_data_rsp *hdr;
2457 struct kvec *iov;
2458
2459 memset(&datain, 0, sizeof(struct iscsi_datain));
2460 dr = iscsit_get_datain_values(cmd, &datain);
2461 if (!dr) {
2462 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2463 cmd->init_task_tag);
2464 return -1;
2465 }
2466
2467 /*
2468 * Be paranoid and double check the logic for now.
2469 */
2470 if ((datain.offset + datain.length) > cmd->data_length) {
2471 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2472 " datain.length: %u exceeds cmd->data_length: %u\n",
2473 cmd->init_task_tag, datain.offset, datain.length,
2474 cmd->data_length);
2475 return -1;
2476 }
2477
2478 spin_lock_bh(&conn->sess->session_stats_lock);
2479 conn->sess->tx_data_octets += datain.length;
2480 if (conn->sess->se_sess->se_node_acl) {
2481 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2482 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2483 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2484 }
2485 spin_unlock_bh(&conn->sess->session_stats_lock);
2486 /*
2487 * Special case for successfully execution w/ both DATAIN
2488 * and Sense Data.
2489 */
2490 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2491 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2492 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2493 else {
2494 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2495 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2496 iscsit_increment_maxcmdsn(cmd, conn->sess);
2497 cmd->stat_sn = conn->stat_sn++;
2498 set_statsn = 1;
2499 } else if (dr->dr_complete ==
2500 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2501 set_statsn = 1;
2502 }
2503
2504 hdr = (struct iscsi_data_rsp *) cmd->pdu;
2505 memset(hdr, 0, ISCSI_HDR_LEN);
2506 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2507 hdr->flags = datain.flags;
2508 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2509 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2510 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2511 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2512 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2513 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2514 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2515 }
2516 }
2517 hton24(hdr->dlength, datain.length);
2518 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2519 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2520 (struct scsi_lun *)&hdr->lun);
2521 else
2522 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2523
2524 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2525 hdr->ttt = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
2526 cpu_to_be32(cmd->targ_xfer_tag) :
2527 0xFFFFFFFF;
2528 hdr->statsn = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
2529 0xFFFFFFFF;
2530 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2531 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2532 hdr->datasn = cpu_to_be32(datain.data_sn);
2533 hdr->offset = cpu_to_be32(datain.offset);
2534
2535 iov = &cmd->iov_data[0];
2536 iov[iov_count].iov_base = cmd->pdu;
2537 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2538 tx_size += ISCSI_HDR_LEN;
2539
2540 if (conn->conn_ops->HeaderDigest) {
2541 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2542
2543 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2544 (unsigned char *)hdr, ISCSI_HDR_LEN,
2545 0, NULL, (u8 *)header_digest);
2546
2547 iov[0].iov_len += ISCSI_CRC_LEN;
2548 tx_size += ISCSI_CRC_LEN;
2549
2550 pr_debug("Attaching CRC32 HeaderDigest"
2551 " for DataIN PDU 0x%08x\n", *header_digest);
2552 }
2553
2554 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2555 if (iov_ret < 0)
2556 return -1;
2557
2558 iov_count += iov_ret;
2559 tx_size += datain.length;
2560
2561 cmd->padding = ((-datain.length) & 3);
2562 if (cmd->padding) {
2563 iov[iov_count].iov_base = cmd->pad_bytes;
2564 iov[iov_count++].iov_len = cmd->padding;
2565 tx_size += cmd->padding;
2566
2567 pr_debug("Attaching %u padding bytes\n",
2568 cmd->padding);
2569 }
2570 if (conn->conn_ops->DataDigest) {
2571 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2572 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2573
2574 iov[iov_count].iov_base = &cmd->data_crc;
2575 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2576 tx_size += ISCSI_CRC_LEN;
2577
2578 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2579 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2580 }
2581
2582 cmd->iov_data_count = iov_count;
2583 cmd->tx_size = tx_size;
2584
2585 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2586 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2587 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2588 ntohl(hdr->offset), datain.length, conn->cid);
2589
2590 if (dr->dr_complete) {
2591 *eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2592 2 : 1;
2593 iscsit_free_datain_req(cmd, dr);
2594 }
2595
2596 return 0;
2597 }
2598
2599 static int iscsit_send_logout_response(
2600 struct iscsi_cmd *cmd,
2601 struct iscsi_conn *conn)
2602 {
2603 int niov = 0, tx_size;
2604 struct iscsi_conn *logout_conn = NULL;
2605 struct iscsi_conn_recovery *cr = NULL;
2606 struct iscsi_session *sess = conn->sess;
2607 struct kvec *iov;
2608 struct iscsi_logout_rsp *hdr;
2609 /*
2610 * The actual shutting down of Sessions and/or Connections
2611 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2612 * is done in scsi_logout_post_handler().
2613 */
2614 switch (cmd->logout_reason) {
2615 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2616 pr_debug("iSCSI session logout successful, setting"
2617 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2618 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2619 break;
2620 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2621 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2622 break;
2623 /*
2624 * For CLOSECONNECTION logout requests carrying
2625 * a matching logout CID -> local CID, the reference
2626 * for the local CID will have been incremented in
2627 * iscsi_logout_closeconnection().
2628 *
2629 * For CLOSECONNECTION logout requests carrying
2630 * a different CID than the connection it arrived
2631 * on, the connection responding to cmd->logout_cid
2632 * is stopped in iscsit_logout_post_handler_diffcid().
2633 */
2634
2635 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2636 " successful.\n", cmd->logout_cid, conn->cid);
2637 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2638 break;
2639 case ISCSI_LOGOUT_REASON_RECOVERY:
2640 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2641 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2642 break;
2643 /*
2644 * If the connection is still active from our point of view
2645 * force connection recovery to occur.
2646 */
2647 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2648 cmd->logout_cid);
2649 if ((logout_conn)) {
2650 iscsit_connection_reinstatement_rcfr(logout_conn);
2651 iscsit_dec_conn_usage_count(logout_conn);
2652 }
2653
2654 cr = iscsit_get_inactive_connection_recovery_entry(
2655 conn->sess, cmd->logout_cid);
2656 if (!cr) {
2657 pr_err("Unable to locate CID: %hu for"
2658 " REMOVECONNFORRECOVERY Logout Request.\n",
2659 cmd->logout_cid);
2660 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2661 break;
2662 }
2663
2664 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2665
2666 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2667 " for recovery for CID: %hu on CID: %hu successful.\n",
2668 cmd->logout_cid, conn->cid);
2669 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2670 break;
2671 default:
2672 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2673 cmd->logout_reason);
2674 return -1;
2675 }
2676
2677 tx_size = ISCSI_HDR_LEN;
2678 hdr = (struct iscsi_logout_rsp *)cmd->pdu;
2679 memset(hdr, 0, ISCSI_HDR_LEN);
2680 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2681 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2682 hdr->response = cmd->logout_response;
2683 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2684 cmd->stat_sn = conn->stat_sn++;
2685 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2686
2687 iscsit_increment_maxcmdsn(cmd, conn->sess);
2688 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2689 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2690
2691 iov = &cmd->iov_misc[0];
2692 iov[niov].iov_base = cmd->pdu;
2693 iov[niov++].iov_len = ISCSI_HDR_LEN;
2694
2695 if (conn->conn_ops->HeaderDigest) {
2696 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2697
2698 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2699 (unsigned char *)hdr, ISCSI_HDR_LEN,
2700 0, NULL, (u8 *)header_digest);
2701
2702 iov[0].iov_len += ISCSI_CRC_LEN;
2703 tx_size += ISCSI_CRC_LEN;
2704 pr_debug("Attaching CRC32C HeaderDigest to"
2705 " Logout Response 0x%08x\n", *header_digest);
2706 }
2707 cmd->iov_misc_count = niov;
2708 cmd->tx_size = tx_size;
2709
2710 pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2711 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2712 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2713 cmd->logout_cid, conn->cid);
2714
2715 return 0;
2716 }
2717
2718 /*
2719 * Unsolicited NOPIN, either requesting a response or not.
2720 */
2721 static int iscsit_send_unsolicited_nopin(
2722 struct iscsi_cmd *cmd,
2723 struct iscsi_conn *conn,
2724 int want_response)
2725 {
2726 int tx_size = ISCSI_HDR_LEN;
2727 struct iscsi_nopin *hdr;
2728
2729 hdr = (struct iscsi_nopin *) cmd->pdu;
2730 memset(hdr, 0, ISCSI_HDR_LEN);
2731 hdr->opcode = ISCSI_OP_NOOP_IN;
2732 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2733 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2734 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2735 cmd->stat_sn = conn->stat_sn;
2736 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2737 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2738 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2739
2740 if (conn->conn_ops->HeaderDigest) {
2741 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2742
2743 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2744 (unsigned char *)hdr, ISCSI_HDR_LEN,
2745 0, NULL, (u8 *)header_digest);
2746
2747 tx_size += ISCSI_CRC_LEN;
2748 pr_debug("Attaching CRC32C HeaderDigest to"
2749 " NopIN 0x%08x\n", *header_digest);
2750 }
2751
2752 cmd->iov_misc[0].iov_base = cmd->pdu;
2753 cmd->iov_misc[0].iov_len = tx_size;
2754 cmd->iov_misc_count = 1;
2755 cmd->tx_size = tx_size;
2756
2757 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2758 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2759
2760 return 0;
2761 }
2762
2763 static int iscsit_send_nopin_response(
2764 struct iscsi_cmd *cmd,
2765 struct iscsi_conn *conn)
2766 {
2767 int niov = 0, tx_size;
2768 u32 padding = 0;
2769 struct kvec *iov;
2770 struct iscsi_nopin *hdr;
2771
2772 tx_size = ISCSI_HDR_LEN;
2773 hdr = (struct iscsi_nopin *) cmd->pdu;
2774 memset(hdr, 0, ISCSI_HDR_LEN);
2775 hdr->opcode = ISCSI_OP_NOOP_IN;
2776 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2777 hton24(hdr->dlength, cmd->buf_ptr_size);
2778 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2779 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2780 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2781 cmd->stat_sn = conn->stat_sn++;
2782 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2783
2784 iscsit_increment_maxcmdsn(cmd, conn->sess);
2785 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2786 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2787
2788 iov = &cmd->iov_misc[0];
2789 iov[niov].iov_base = cmd->pdu;
2790 iov[niov++].iov_len = ISCSI_HDR_LEN;
2791
2792 if (conn->conn_ops->HeaderDigest) {
2793 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2794
2795 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2796 (unsigned char *)hdr, ISCSI_HDR_LEN,
2797 0, NULL, (u8 *)header_digest);
2798
2799 iov[0].iov_len += ISCSI_CRC_LEN;
2800 tx_size += ISCSI_CRC_LEN;
2801 pr_debug("Attaching CRC32C HeaderDigest"
2802 " to NopIn 0x%08x\n", *header_digest);
2803 }
2804
2805 /*
2806 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2807 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2808 */
2809 if (cmd->buf_ptr_size) {
2810 iov[niov].iov_base = cmd->buf_ptr;
2811 iov[niov++].iov_len = cmd->buf_ptr_size;
2812 tx_size += cmd->buf_ptr_size;
2813
2814 pr_debug("Echoing back %u bytes of ping"
2815 " data.\n", cmd->buf_ptr_size);
2816
2817 padding = ((-cmd->buf_ptr_size) & 3);
2818 if (padding != 0) {
2819 iov[niov].iov_base = &cmd->pad_bytes;
2820 iov[niov++].iov_len = padding;
2821 tx_size += padding;
2822 pr_debug("Attaching %u additional"
2823 " padding bytes.\n", padding);
2824 }
2825 if (conn->conn_ops->DataDigest) {
2826 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2827 cmd->buf_ptr, cmd->buf_ptr_size,
2828 padding, (u8 *)&cmd->pad_bytes,
2829 (u8 *)&cmd->data_crc);
2830
2831 iov[niov].iov_base = &cmd->data_crc;
2832 iov[niov++].iov_len = ISCSI_CRC_LEN;
2833 tx_size += ISCSI_CRC_LEN;
2834 pr_debug("Attached DataDigest for %u"
2835 " bytes of ping data, CRC 0x%08x\n",
2836 cmd->buf_ptr_size, cmd->data_crc);
2837 }
2838 }
2839
2840 cmd->iov_misc_count = niov;
2841 cmd->tx_size = tx_size;
2842
2843 pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2844 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2845 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2846
2847 return 0;
2848 }
2849
2850 int iscsit_send_r2t(
2851 struct iscsi_cmd *cmd,
2852 struct iscsi_conn *conn)
2853 {
2854 int tx_size = 0;
2855 struct iscsi_r2t *r2t;
2856 struct iscsi_r2t_rsp *hdr;
2857
2858 r2t = iscsit_get_r2t_from_list(cmd);
2859 if (!r2t)
2860 return -1;
2861
2862 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
2863 memset(hdr, 0, ISCSI_HDR_LEN);
2864 hdr->opcode = ISCSI_OP_R2T;
2865 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2866 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2867 (struct scsi_lun *)&hdr->lun);
2868 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2869 spin_lock_bh(&conn->sess->ttt_lock);
2870 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2871 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2872 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2873 spin_unlock_bh(&conn->sess->ttt_lock);
2874 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
2875 hdr->statsn = cpu_to_be32(conn->stat_sn);
2876 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2877 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2878 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
2879 hdr->data_offset = cpu_to_be32(r2t->offset);
2880 hdr->data_length = cpu_to_be32(r2t->xfer_len);
2881
2882 cmd->iov_misc[0].iov_base = cmd->pdu;
2883 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
2884 tx_size += ISCSI_HDR_LEN;
2885
2886 if (conn->conn_ops->HeaderDigest) {
2887 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2888
2889 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2890 (unsigned char *)hdr, ISCSI_HDR_LEN,
2891 0, NULL, (u8 *)header_digest);
2892
2893 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2894 tx_size += ISCSI_CRC_LEN;
2895 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2896 " PDU 0x%08x\n", *header_digest);
2897 }
2898
2899 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2900 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2901 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2902 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2903 r2t->offset, r2t->xfer_len, conn->cid);
2904
2905 cmd->iov_misc_count = 1;
2906 cmd->tx_size = tx_size;
2907
2908 spin_lock_bh(&cmd->r2t_lock);
2909 r2t->sent_r2t = 1;
2910 spin_unlock_bh(&cmd->r2t_lock);
2911
2912 return 0;
2913 }
2914
2915 /*
2916 * type 0: Normal Operation.
2917 * type 1: Called from Storage Transport.
2918 * type 2: Called from iscsi_task_reassign_complete_write() for
2919 * connection recovery.
2920 */
2921 int iscsit_build_r2ts_for_cmd(
2922 struct iscsi_cmd *cmd,
2923 struct iscsi_conn *conn,
2924 int type)
2925 {
2926 int first_r2t = 1;
2927 u32 offset = 0, xfer_len = 0;
2928
2929 spin_lock_bh(&cmd->r2t_lock);
2930 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2931 spin_unlock_bh(&cmd->r2t_lock);
2932 return 0;
2933 }
2934
2935 if (conn->sess->sess_ops->DataSequenceInOrder && (type != 2))
2936 if (cmd->r2t_offset < cmd->write_data_done)
2937 cmd->r2t_offset = cmd->write_data_done;
2938
2939 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2940 if (conn->sess->sess_ops->DataSequenceInOrder) {
2941 offset = cmd->r2t_offset;
2942
2943 if (first_r2t && (type == 2)) {
2944 xfer_len = ((offset +
2945 (conn->sess->sess_ops->MaxBurstLength -
2946 cmd->next_burst_len) >
2947 cmd->data_length) ?
2948 (cmd->data_length - offset) :
2949 (conn->sess->sess_ops->MaxBurstLength -
2950 cmd->next_burst_len));
2951 } else {
2952 xfer_len = ((offset +
2953 conn->sess->sess_ops->MaxBurstLength) >
2954 cmd->data_length) ?
2955 (cmd->data_length - offset) :
2956 conn->sess->sess_ops->MaxBurstLength;
2957 }
2958 cmd->r2t_offset += xfer_len;
2959
2960 if (cmd->r2t_offset == cmd->data_length)
2961 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2962 } else {
2963 struct iscsi_seq *seq;
2964
2965 seq = iscsit_get_seq_holder_for_r2t(cmd);
2966 if (!seq) {
2967 spin_unlock_bh(&cmd->r2t_lock);
2968 return -1;
2969 }
2970
2971 offset = seq->offset;
2972 xfer_len = seq->xfer_len;
2973
2974 if (cmd->seq_send_order == cmd->seq_count)
2975 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2976 }
2977 cmd->outstanding_r2ts++;
2978 first_r2t = 0;
2979
2980 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
2981 spin_unlock_bh(&cmd->r2t_lock);
2982 return -1;
2983 }
2984
2985 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
2986 break;
2987 }
2988 spin_unlock_bh(&cmd->r2t_lock);
2989
2990 return 0;
2991 }
2992
2993 static int iscsit_send_status(
2994 struct iscsi_cmd *cmd,
2995 struct iscsi_conn *conn)
2996 {
2997 u8 iov_count = 0, recovery;
2998 u32 padding = 0, tx_size = 0;
2999 struct iscsi_scsi_rsp *hdr;
3000 struct kvec *iov;
3001
3002 recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3003 if (!recovery)
3004 cmd->stat_sn = conn->stat_sn++;
3005
3006 spin_lock_bh(&conn->sess->session_stats_lock);
3007 conn->sess->rsp_pdus++;
3008 spin_unlock_bh(&conn->sess->session_stats_lock);
3009
3010 hdr = (struct iscsi_scsi_rsp *) cmd->pdu;
3011 memset(hdr, 0, ISCSI_HDR_LEN);
3012 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3013 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3014 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3015 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3016 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3017 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3018 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3019 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3020 }
3021 hdr->response = cmd->iscsi_response;
3022 hdr->cmd_status = cmd->se_cmd.scsi_status;
3023 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3024 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3025
3026 iscsit_increment_maxcmdsn(cmd, conn->sess);
3027 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3028 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3029
3030 iov = &cmd->iov_misc[0];
3031 iov[iov_count].iov_base = cmd->pdu;
3032 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3033 tx_size += ISCSI_HDR_LEN;
3034
3035 /*
3036 * Attach SENSE DATA payload to iSCSI Response PDU
3037 */
3038 if (cmd->se_cmd.sense_buffer &&
3039 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3040 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3041 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3042 hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
3043 iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
3044 iov[iov_count++].iov_len =
3045 (cmd->se_cmd.scsi_sense_length + padding);
3046 tx_size += cmd->se_cmd.scsi_sense_length;
3047
3048 if (padding) {
3049 memset(cmd->se_cmd.sense_buffer +
3050 cmd->se_cmd.scsi_sense_length, 0, padding);
3051 tx_size += padding;
3052 pr_debug("Adding %u bytes of padding to"
3053 " SENSE.\n", padding);
3054 }
3055
3056 if (conn->conn_ops->DataDigest) {
3057 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3058 cmd->se_cmd.sense_buffer,
3059 (cmd->se_cmd.scsi_sense_length + padding),
3060 0, NULL, (u8 *)&cmd->data_crc);
3061
3062 iov[iov_count].iov_base = &cmd->data_crc;
3063 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3064 tx_size += ISCSI_CRC_LEN;
3065
3066 pr_debug("Attaching CRC32 DataDigest for"
3067 " SENSE, %u bytes CRC 0x%08x\n",
3068 (cmd->se_cmd.scsi_sense_length + padding),
3069 cmd->data_crc);
3070 }
3071
3072 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3073 " Response PDU\n",
3074 cmd->se_cmd.scsi_sense_length);
3075 }
3076
3077 if (conn->conn_ops->HeaderDigest) {
3078 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3079
3080 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3081 (unsigned char *)hdr, ISCSI_HDR_LEN,
3082 0, NULL, (u8 *)header_digest);
3083
3084 iov[0].iov_len += ISCSI_CRC_LEN;
3085 tx_size += ISCSI_CRC_LEN;
3086 pr_debug("Attaching CRC32 HeaderDigest for Response"
3087 " PDU 0x%08x\n", *header_digest);
3088 }
3089
3090 cmd->iov_misc_count = iov_count;
3091 cmd->tx_size = tx_size;
3092
3093 pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3094 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3095 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3096 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3097
3098 return 0;
3099 }
3100
3101 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3102 {
3103 switch (se_tmr->response) {
3104 case TMR_FUNCTION_COMPLETE:
3105 return ISCSI_TMF_RSP_COMPLETE;
3106 case TMR_TASK_DOES_NOT_EXIST:
3107 return ISCSI_TMF_RSP_NO_TASK;
3108 case TMR_LUN_DOES_NOT_EXIST:
3109 return ISCSI_TMF_RSP_NO_LUN;
3110 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3111 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3112 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3113 return ISCSI_TMF_RSP_AUTH_FAILED;
3114 case TMR_FUNCTION_REJECTED:
3115 default:
3116 return ISCSI_TMF_RSP_REJECTED;
3117 }
3118 }
3119
3120 static int iscsit_send_task_mgt_rsp(
3121 struct iscsi_cmd *cmd,
3122 struct iscsi_conn *conn)
3123 {
3124 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3125 struct iscsi_tm_rsp *hdr;
3126 u32 tx_size = 0;
3127
3128 hdr = (struct iscsi_tm_rsp *) cmd->pdu;
3129 memset(hdr, 0, ISCSI_HDR_LEN);
3130 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3131 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3132 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3133 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3134 cmd->stat_sn = conn->stat_sn++;
3135 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3136
3137 iscsit_increment_maxcmdsn(cmd, conn->sess);
3138 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3139 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3140
3141 cmd->iov_misc[0].iov_base = cmd->pdu;
3142 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3143 tx_size += ISCSI_HDR_LEN;
3144
3145 if (conn->conn_ops->HeaderDigest) {
3146 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3147
3148 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3149 (unsigned char *)hdr, ISCSI_HDR_LEN,
3150 0, NULL, (u8 *)header_digest);
3151
3152 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3153 tx_size += ISCSI_CRC_LEN;
3154 pr_debug("Attaching CRC32 HeaderDigest for Task"
3155 " Mgmt Response PDU 0x%08x\n", *header_digest);
3156 }
3157
3158 cmd->iov_misc_count = 1;
3159 cmd->tx_size = tx_size;
3160
3161 pr_debug("Built Task Management Response ITT: 0x%08x,"
3162 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3163 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3164
3165 return 0;
3166 }
3167
3168 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3169 {
3170 char *payload = NULL;
3171 struct iscsi_conn *conn = cmd->conn;
3172 struct iscsi_portal_group *tpg;
3173 struct iscsi_tiqn *tiqn;
3174 struct iscsi_tpg_np *tpg_np;
3175 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3176 unsigned char buf[256];
3177
3178 buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ?
3179 32768 : conn->conn_ops->MaxRecvDataSegmentLength;
3180
3181 memset(buf, 0, 256);
3182
3183 payload = kzalloc(buffer_len, GFP_KERNEL);
3184 if (!payload) {
3185 pr_err("Unable to allocate memory for sendtargets"
3186 " response.\n");
3187 return -ENOMEM;
3188 }
3189
3190 spin_lock(&tiqn_lock);
3191 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3192 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3193 len += 1;
3194
3195 if ((len + payload_len) > buffer_len) {
3196 spin_unlock(&tiqn->tiqn_tpg_lock);
3197 end_of_buf = 1;
3198 goto eob;
3199 }
3200 memcpy((void *)payload + payload_len, buf, len);
3201 payload_len += len;
3202
3203 spin_lock(&tiqn->tiqn_tpg_lock);
3204 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3205
3206 spin_lock(&tpg->tpg_state_lock);
3207 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3208 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3209 spin_unlock(&tpg->tpg_state_lock);
3210 continue;
3211 }
3212 spin_unlock(&tpg->tpg_state_lock);
3213
3214 spin_lock(&tpg->tpg_np_lock);
3215 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3216 tpg_np_list) {
3217 len = sprintf(buf, "TargetAddress="
3218 "%s%s%s:%hu,%hu",
3219 (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
3220 "[" : "", tpg_np->tpg_np->np_ip,
3221 (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
3222 "]" : "", tpg_np->tpg_np->np_port,
3223 tpg->tpgt);
3224 len += 1;
3225
3226 if ((len + payload_len) > buffer_len) {
3227 spin_unlock(&tpg->tpg_np_lock);
3228 spin_unlock(&tiqn->tiqn_tpg_lock);
3229 end_of_buf = 1;
3230 goto eob;
3231 }
3232 memcpy((void *)payload + payload_len, buf, len);
3233 payload_len += len;
3234 }
3235 spin_unlock(&tpg->tpg_np_lock);
3236 }
3237 spin_unlock(&tiqn->tiqn_tpg_lock);
3238 eob:
3239 if (end_of_buf)
3240 break;
3241 }
3242 spin_unlock(&tiqn_lock);
3243
3244 cmd->buf_ptr = payload;
3245
3246 return payload_len;
3247 }
3248
3249 /*
3250 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3251 * MaxRecvDataSegmentLength.
3252 */
3253 static int iscsit_send_text_rsp(
3254 struct iscsi_cmd *cmd,
3255 struct iscsi_conn *conn)
3256 {
3257 struct iscsi_text_rsp *hdr;
3258 struct kvec *iov;
3259 u32 padding = 0, tx_size = 0;
3260 int text_length, iov_count = 0;
3261
3262 text_length = iscsit_build_sendtargets_response(cmd);
3263 if (text_length < 0)
3264 return text_length;
3265
3266 padding = ((-text_length) & 3);
3267 if (padding != 0) {
3268 memset(cmd->buf_ptr + text_length, 0, padding);
3269 pr_debug("Attaching %u additional bytes for"
3270 " padding.\n", padding);
3271 }
3272
3273 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3274 memset(hdr, 0, ISCSI_HDR_LEN);
3275 hdr->opcode = ISCSI_OP_TEXT_RSP;
3276 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3277 hton24(hdr->dlength, text_length);
3278 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3279 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3280 cmd->stat_sn = conn->stat_sn++;
3281 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3282
3283 iscsit_increment_maxcmdsn(cmd, conn->sess);
3284 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3285 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3286
3287 iov = &cmd->iov_misc[0];
3288
3289 iov[iov_count].iov_base = cmd->pdu;
3290 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3291 iov[iov_count].iov_base = cmd->buf_ptr;
3292 iov[iov_count++].iov_len = text_length + padding;
3293
3294 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3295
3296 if (conn->conn_ops->HeaderDigest) {
3297 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3298
3299 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3300 (unsigned char *)hdr, ISCSI_HDR_LEN,
3301 0, NULL, (u8 *)header_digest);
3302
3303 iov[0].iov_len += ISCSI_CRC_LEN;
3304 tx_size += ISCSI_CRC_LEN;
3305 pr_debug("Attaching CRC32 HeaderDigest for"
3306 " Text Response PDU 0x%08x\n", *header_digest);
3307 }
3308
3309 if (conn->conn_ops->DataDigest) {
3310 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3311 cmd->buf_ptr, (text_length + padding),
3312 0, NULL, (u8 *)&cmd->data_crc);
3313
3314 iov[iov_count].iov_base = &cmd->data_crc;
3315 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3316 tx_size += ISCSI_CRC_LEN;
3317
3318 pr_debug("Attaching DataDigest for %u bytes of text"
3319 " data, CRC 0x%08x\n", (text_length + padding),
3320 cmd->data_crc);
3321 }
3322
3323 cmd->iov_misc_count = iov_count;
3324 cmd->tx_size = tx_size;
3325
3326 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3327 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3328 text_length, conn->cid);
3329 return 0;
3330 }
3331
3332 static int iscsit_send_reject(
3333 struct iscsi_cmd *cmd,
3334 struct iscsi_conn *conn)
3335 {
3336 u32 iov_count = 0, tx_size = 0;
3337 struct iscsi_reject *hdr;
3338 struct kvec *iov;
3339
3340 hdr = (struct iscsi_reject *) cmd->pdu;
3341 hdr->opcode = ISCSI_OP_REJECT;
3342 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3343 hton24(hdr->dlength, ISCSI_HDR_LEN);
3344 cmd->stat_sn = conn->stat_sn++;
3345 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3346 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3347 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3348
3349 iov = &cmd->iov_misc[0];
3350
3351 iov[iov_count].iov_base = cmd->pdu;
3352 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3353 iov[iov_count].iov_base = cmd->buf_ptr;
3354 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3355
3356 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3357
3358 if (conn->conn_ops->HeaderDigest) {
3359 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3360
3361 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3362 (unsigned char *)hdr, ISCSI_HDR_LEN,
3363 0, NULL, (u8 *)header_digest);
3364
3365 iov[0].iov_len += ISCSI_CRC_LEN;
3366 tx_size += ISCSI_CRC_LEN;
3367 pr_debug("Attaching CRC32 HeaderDigest for"
3368 " REJECT PDU 0x%08x\n", *header_digest);
3369 }
3370
3371 if (conn->conn_ops->DataDigest) {
3372 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3373 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3374 0, NULL, (u8 *)&cmd->data_crc);
3375
3376 iov[iov_count].iov_base = &cmd->data_crc;
3377 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3378 tx_size += ISCSI_CRC_LEN;
3379 pr_debug("Attaching CRC32 DataDigest for REJECT"
3380 " PDU 0x%08x\n", cmd->data_crc);
3381 }
3382
3383 cmd->iov_misc_count = iov_count;
3384 cmd->tx_size = tx_size;
3385
3386 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3387 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3388
3389 return 0;
3390 }
3391
3392 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
3393 {
3394 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
3395 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
3396 wait_for_completion_interruptible_timeout(
3397 &conn->tx_half_close_comp,
3398 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
3399 }
3400 }
3401
3402 #ifdef CONFIG_SMP
3403
3404 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3405 {
3406 struct iscsi_thread_set *ts = conn->thread_set;
3407 int ord, cpu;
3408 /*
3409 * thread_id is assigned from iscsit_global->ts_bitmap from
3410 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3411 *
3412 * Here we use thread_id to determine which CPU that this
3413 * iSCSI connection's iscsi_thread_set will be scheduled to
3414 * execute upon.
3415 */
3416 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3417 #if 0
3418 pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from"
3419 " thread_id: %d\n", ord, ts->thread_id);
3420 #endif
3421 for_each_online_cpu(cpu) {
3422 if (ord-- == 0) {
3423 cpumask_set_cpu(cpu, conn->conn_cpumask);
3424 return;
3425 }
3426 }
3427 /*
3428 * This should never be reached..
3429 */
3430 dump_stack();
3431 cpumask_setall(conn->conn_cpumask);
3432 }
3433
3434 static inline void iscsit_thread_check_cpumask(
3435 struct iscsi_conn *conn,
3436 struct task_struct *p,
3437 int mode)
3438 {
3439 char buf[128];
3440 /*
3441 * mode == 1 signals iscsi_target_tx_thread() usage.
3442 * mode == 0 signals iscsi_target_rx_thread() usage.
3443 */
3444 if (mode == 1) {
3445 if (!conn->conn_tx_reset_cpumask)
3446 return;
3447 conn->conn_tx_reset_cpumask = 0;
3448 } else {
3449 if (!conn->conn_rx_reset_cpumask)
3450 return;
3451 conn->conn_rx_reset_cpumask = 0;
3452 }
3453 /*
3454 * Update the CPU mask for this single kthread so that
3455 * both TX and RX kthreads are scheduled to run on the
3456 * same CPU.
3457 */
3458 memset(buf, 0, 128);
3459 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3460 #if 0
3461 pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():"
3462 " %s for %s\n", buf, p->comm);
3463 #endif
3464 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3465 }
3466
3467 #else
3468
3469 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3470 {
3471 return;
3472 }
3473
3474 #define iscsit_thread_check_cpumask(X, Y, Z) ({})
3475 #endif /* CONFIG_SMP */
3476
3477 int iscsi_target_tx_thread(void *arg)
3478 {
3479 u8 state;
3480 int eodr = 0;
3481 int ret = 0;
3482 int sent_status = 0;
3483 int use_misc = 0;
3484 int map_sg = 0;
3485 struct iscsi_cmd *cmd = NULL;
3486 struct iscsi_conn *conn;
3487 struct iscsi_queue_req *qr = NULL;
3488 struct se_cmd *se_cmd;
3489 struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3490 /*
3491 * Allow ourselves to be interrupted by SIGINT so that a
3492 * connection recovery / failure event can be triggered externally.
3493 */
3494 allow_signal(SIGINT);
3495
3496 restart:
3497 conn = iscsi_tx_thread_pre_handler(ts);
3498 if (!conn)
3499 goto out;
3500
3501 eodr = map_sg = ret = sent_status = use_misc = 0;
3502
3503 while (!kthread_should_stop()) {
3504 /*
3505 * Ensure that both TX and RX per connection kthreads
3506 * are scheduled to run on the same CPU.
3507 */
3508 iscsit_thread_check_cpumask(conn, current, 1);
3509
3510 schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
3511
3512 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3513 signal_pending(current))
3514 goto transport_err;
3515
3516 get_immediate:
3517 qr = iscsit_get_cmd_from_immediate_queue(conn);
3518 if (qr) {
3519 atomic_set(&conn->check_immediate_queue, 0);
3520 cmd = qr->cmd;
3521 state = qr->state;
3522 kmem_cache_free(lio_qr_cache, qr);
3523
3524 spin_lock_bh(&cmd->istate_lock);
3525 switch (state) {
3526 case ISTATE_SEND_R2T:
3527 spin_unlock_bh(&cmd->istate_lock);
3528 ret = iscsit_send_r2t(cmd, conn);
3529 break;
3530 case ISTATE_REMOVE:
3531 spin_unlock_bh(&cmd->istate_lock);
3532
3533 if (cmd->data_direction == DMA_TO_DEVICE)
3534 iscsit_stop_dataout_timer(cmd);
3535
3536 spin_lock_bh(&conn->cmd_lock);
3537 list_del(&cmd->i_list);
3538 spin_unlock_bh(&conn->cmd_lock);
3539
3540 iscsit_free_cmd(cmd);
3541 goto get_immediate;
3542 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3543 spin_unlock_bh(&cmd->istate_lock);
3544 iscsit_mod_nopin_response_timer(conn);
3545 ret = iscsit_send_unsolicited_nopin(cmd,
3546 conn, 1);
3547 break;
3548 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3549 spin_unlock_bh(&cmd->istate_lock);
3550 ret = iscsit_send_unsolicited_nopin(cmd,
3551 conn, 0);
3552 break;
3553 default:
3554 pr_err("Unknown Opcode: 0x%02x ITT:"
3555 " 0x%08x, i_state: %d on CID: %hu\n",
3556 cmd->iscsi_opcode, cmd->init_task_tag, state,
3557 conn->cid);
3558 spin_unlock_bh(&cmd->istate_lock);
3559 goto transport_err;
3560 }
3561 if (ret < 0) {
3562 conn->tx_immediate_queue = 0;
3563 goto transport_err;
3564 }
3565
3566 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3567 conn->tx_immediate_queue = 0;
3568 iscsit_tx_thread_wait_for_tcp(conn);
3569 goto transport_err;
3570 }
3571
3572 spin_lock_bh(&cmd->istate_lock);
3573 switch (state) {
3574 case ISTATE_SEND_R2T:
3575 spin_unlock_bh(&cmd->istate_lock);
3576 spin_lock_bh(&cmd->dataout_timeout_lock);
3577 iscsit_start_dataout_timer(cmd, conn);
3578 spin_unlock_bh(&cmd->dataout_timeout_lock);
3579 break;
3580 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3581 cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE;
3582 spin_unlock_bh(&cmd->istate_lock);
3583 break;
3584 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3585 cmd->i_state = ISTATE_SENT_STATUS;
3586 spin_unlock_bh(&cmd->istate_lock);
3587 break;
3588 default:
3589 pr_err("Unknown Opcode: 0x%02x ITT:"
3590 " 0x%08x, i_state: %d on CID: %hu\n",
3591 cmd->iscsi_opcode, cmd->init_task_tag,
3592 state, conn->cid);
3593 spin_unlock_bh(&cmd->istate_lock);
3594 goto transport_err;
3595 }
3596 goto get_immediate;
3597 } else
3598 conn->tx_immediate_queue = 0;
3599
3600 get_response:
3601 qr = iscsit_get_cmd_from_response_queue(conn);
3602 if (qr) {
3603 cmd = qr->cmd;
3604 state = qr->state;
3605 kmem_cache_free(lio_qr_cache, qr);
3606
3607 spin_lock_bh(&cmd->istate_lock);
3608 check_rsp_state:
3609 switch (state) {
3610 case ISTATE_SEND_DATAIN:
3611 spin_unlock_bh(&cmd->istate_lock);
3612 ret = iscsit_send_data_in(cmd, conn,
3613 &eodr);
3614 map_sg = 1;
3615 break;
3616 case ISTATE_SEND_STATUS:
3617 case ISTATE_SEND_STATUS_RECOVERY:
3618 spin_unlock_bh(&cmd->istate_lock);
3619 use_misc = 1;
3620 ret = iscsit_send_status(cmd, conn);
3621 break;
3622 case ISTATE_SEND_LOGOUTRSP:
3623 spin_unlock_bh(&cmd->istate_lock);
3624 use_misc = 1;
3625 ret = iscsit_send_logout_response(cmd, conn);
3626 break;
3627 case ISTATE_SEND_ASYNCMSG:
3628 spin_unlock_bh(&cmd->istate_lock);
3629 use_misc = 1;
3630 ret = iscsit_send_conn_drop_async_message(
3631 cmd, conn);
3632 break;
3633 case ISTATE_SEND_NOPIN:
3634 spin_unlock_bh(&cmd->istate_lock);
3635 use_misc = 1;
3636 ret = iscsit_send_nopin_response(cmd, conn);
3637 break;
3638 case ISTATE_SEND_REJECT:
3639 spin_unlock_bh(&cmd->istate_lock);
3640 use_misc = 1;
3641 ret = iscsit_send_reject(cmd, conn);
3642 break;
3643 case ISTATE_SEND_TASKMGTRSP:
3644 spin_unlock_bh(&cmd->istate_lock);
3645 use_misc = 1;
3646 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3647 if (ret != 0)
3648 break;
3649 ret = iscsit_tmr_post_handler(cmd, conn);
3650 if (ret != 0)
3651 iscsit_fall_back_to_erl0(conn->sess);
3652 break;
3653 case ISTATE_SEND_TEXTRSP:
3654 spin_unlock_bh(&cmd->istate_lock);
3655 use_misc = 1;
3656 ret = iscsit_send_text_rsp(cmd, conn);
3657 break;
3658 default:
3659 pr_err("Unknown Opcode: 0x%02x ITT:"
3660 " 0x%08x, i_state: %d on CID: %hu\n",
3661 cmd->iscsi_opcode, cmd->init_task_tag,
3662 state, conn->cid);
3663 spin_unlock_bh(&cmd->istate_lock);
3664 goto transport_err;
3665 }
3666 if (ret < 0) {
3667 conn->tx_response_queue = 0;
3668 goto transport_err;
3669 }
3670
3671 se_cmd = &cmd->se_cmd;
3672
3673 if (map_sg && !conn->conn_ops->IFMarker) {
3674 if (iscsit_fe_sendpage_sg(cmd, conn) < 0) {
3675 conn->tx_response_queue = 0;
3676 iscsit_tx_thread_wait_for_tcp(conn);
3677 iscsit_unmap_iovec(cmd);
3678 goto transport_err;
3679 }
3680 } else {
3681 if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) {
3682 conn->tx_response_queue = 0;
3683 iscsit_tx_thread_wait_for_tcp(conn);
3684 iscsit_unmap_iovec(cmd);
3685 goto transport_err;
3686 }
3687 }
3688 map_sg = 0;
3689 iscsit_unmap_iovec(cmd);
3690
3691 spin_lock_bh(&cmd->istate_lock);
3692 switch (state) {
3693 case ISTATE_SEND_DATAIN:
3694 if (!eodr)
3695 goto check_rsp_state;
3696
3697 if (eodr == 1) {
3698 cmd->i_state = ISTATE_SENT_LAST_DATAIN;
3699 sent_status = 1;
3700 eodr = use_misc = 0;
3701 } else if (eodr == 2) {
3702 cmd->i_state = state =
3703 ISTATE_SEND_STATUS;
3704 sent_status = 0;
3705 eodr = use_misc = 0;
3706 goto check_rsp_state;
3707 }
3708 break;
3709 case ISTATE_SEND_STATUS:
3710 use_misc = 0;
3711 sent_status = 1;
3712 break;
3713 case ISTATE_SEND_ASYNCMSG:
3714 case ISTATE_SEND_NOPIN:
3715 case ISTATE_SEND_STATUS_RECOVERY:
3716 case ISTATE_SEND_TEXTRSP:
3717 use_misc = 0;
3718 sent_status = 1;
3719 break;
3720 case ISTATE_SEND_REJECT:
3721 use_misc = 0;
3722 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3723 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3724 spin_unlock_bh(&cmd->istate_lock);
3725 complete(&cmd->reject_comp);
3726 goto transport_err;
3727 }
3728 complete(&cmd->reject_comp);
3729 break;
3730 case ISTATE_SEND_TASKMGTRSP:
3731 use_misc = 0;
3732 sent_status = 1;
3733 break;
3734 case ISTATE_SEND_LOGOUTRSP:
3735 spin_unlock_bh(&cmd->istate_lock);
3736 if (!iscsit_logout_post_handler(cmd, conn))
3737 goto restart;
3738 spin_lock_bh(&cmd->istate_lock);
3739 use_misc = 0;
3740 sent_status = 1;
3741 break;
3742 default:
3743 pr_err("Unknown Opcode: 0x%02x ITT:"
3744 " 0x%08x, i_state: %d on CID: %hu\n",
3745 cmd->iscsi_opcode, cmd->init_task_tag,
3746 cmd->i_state, conn->cid);
3747 spin_unlock_bh(&cmd->istate_lock);
3748 goto transport_err;
3749 }
3750
3751 if (sent_status) {
3752 cmd->i_state = ISTATE_SENT_STATUS;
3753 sent_status = 0;
3754 }
3755 spin_unlock_bh(&cmd->istate_lock);
3756
3757 if (atomic_read(&conn->check_immediate_queue))
3758 goto get_immediate;
3759
3760 goto get_response;
3761 } else
3762 conn->tx_response_queue = 0;
3763 }
3764
3765 transport_err:
3766 iscsit_take_action_for_connection_exit(conn);
3767 goto restart;
3768 out:
3769 return 0;
3770 }
3771
3772 int iscsi_target_rx_thread(void *arg)
3773 {
3774 int ret;
3775 u8 buffer[ISCSI_HDR_LEN], opcode;
3776 u32 checksum = 0, digest = 0;
3777 struct iscsi_conn *conn = NULL;
3778 struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3779 struct kvec iov;
3780 /*
3781 * Allow ourselves to be interrupted by SIGINT so that a
3782 * connection recovery / failure event can be triggered externally.
3783 */
3784 allow_signal(SIGINT);
3785
3786 restart:
3787 conn = iscsi_rx_thread_pre_handler(ts);
3788 if (!conn)
3789 goto out;
3790
3791 while (!kthread_should_stop()) {
3792 /*
3793 * Ensure that both TX and RX per connection kthreads
3794 * are scheduled to run on the same CPU.
3795 */
3796 iscsit_thread_check_cpumask(conn, current, 0);
3797
3798 memset(buffer, 0, ISCSI_HDR_LEN);
3799 memset(&iov, 0, sizeof(struct kvec));
3800
3801 iov.iov_base = buffer;
3802 iov.iov_len = ISCSI_HDR_LEN;
3803
3804 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3805 if (ret != ISCSI_HDR_LEN) {
3806 iscsit_rx_thread_wait_for_tcp(conn);
3807 goto transport_err;
3808 }
3809
3810 /*
3811 * Set conn->bad_hdr for use with REJECT PDUs.
3812 */
3813 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3814
3815 if (conn->conn_ops->HeaderDigest) {
3816 iov.iov_base = &digest;
3817 iov.iov_len = ISCSI_CRC_LEN;
3818
3819 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3820 if (ret != ISCSI_CRC_LEN) {
3821 iscsit_rx_thread_wait_for_tcp(conn);
3822 goto transport_err;
3823 }
3824
3825 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3826 buffer, ISCSI_HDR_LEN,
3827 0, NULL, (u8 *)&checksum);
3828
3829 if (digest != checksum) {
3830 pr_err("HeaderDigest CRC32C failed,"
3831 " received 0x%08x, computed 0x%08x\n",
3832 digest, checksum);
3833 /*
3834 * Set the PDU to 0xff so it will intentionally
3835 * hit default in the switch below.
3836 */
3837 memset(buffer, 0xff, ISCSI_HDR_LEN);
3838 spin_lock_bh(&conn->sess->session_stats_lock);
3839 conn->sess->conn_digest_errors++;
3840 spin_unlock_bh(&conn->sess->session_stats_lock);
3841 } else {
3842 pr_debug("Got HeaderDigest CRC32C"
3843 " 0x%08x\n", checksum);
3844 }
3845 }
3846
3847 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3848 goto transport_err;
3849
3850 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3851
3852 if (conn->sess->sess_ops->SessionType &&
3853 ((!(opcode & ISCSI_OP_TEXT)) ||
3854 (!(opcode & ISCSI_OP_LOGOUT)))) {
3855 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3856 " while in Discovery Session, rejecting.\n", opcode);
3857 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3858 buffer, conn);
3859 goto transport_err;
3860 }
3861
3862 switch (opcode) {
3863 case ISCSI_OP_SCSI_CMD:
3864 if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3865 goto transport_err;
3866 break;
3867 case ISCSI_OP_SCSI_DATA_OUT:
3868 if (iscsit_handle_data_out(conn, buffer) < 0)
3869 goto transport_err;
3870 break;
3871 case ISCSI_OP_NOOP_OUT:
3872 if (iscsit_handle_nop_out(conn, buffer) < 0)
3873 goto transport_err;
3874 break;
3875 case ISCSI_OP_SCSI_TMFUNC:
3876 if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3877 goto transport_err;
3878 break;
3879 case ISCSI_OP_TEXT:
3880 if (iscsit_handle_text_cmd(conn, buffer) < 0)
3881 goto transport_err;
3882 break;
3883 case ISCSI_OP_LOGOUT:
3884 ret = iscsit_handle_logout_cmd(conn, buffer);
3885 if (ret > 0) {
3886 wait_for_completion_timeout(&conn->conn_logout_comp,
3887 SECONDS_FOR_LOGOUT_COMP * HZ);
3888 goto transport_err;
3889 } else if (ret < 0)
3890 goto transport_err;
3891 break;
3892 case ISCSI_OP_SNACK:
3893 if (iscsit_handle_snack(conn, buffer) < 0)
3894 goto transport_err;
3895 break;
3896 default:
3897 pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3898 opcode);
3899 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3900 pr_err("Cannot recover from unknown"
3901 " opcode while ERL=0, closing iSCSI connection"
3902 ".\n");
3903 goto transport_err;
3904 }
3905 if (!conn->conn_ops->OFMarker) {
3906 pr_err("Unable to recover from unknown"
3907 " opcode while OFMarker=No, closing iSCSI"
3908 " connection.\n");
3909 goto transport_err;
3910 }
3911 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3912 pr_err("Unable to recover from unknown"
3913 " opcode, closing iSCSI connection.\n");
3914 goto transport_err;
3915 }
3916 break;
3917 }
3918 }
3919
3920 transport_err:
3921 if (!signal_pending(current))
3922 atomic_set(&conn->transport_failed, 1);
3923 iscsit_take_action_for_connection_exit(conn);
3924 goto restart;
3925 out:
3926 return 0;
3927 }
3928
3929 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3930 {
3931 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3932 struct iscsi_session *sess = conn->sess;
3933 /*
3934 * We expect this function to only ever be called from either RX or TX
3935 * thread context via iscsit_close_connection() once the other context
3936 * has been reset -> returned sleeping pre-handler state.
3937 */
3938 spin_lock_bh(&conn->cmd_lock);
3939 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) {
3940
3941 list_del(&cmd->i_list);
3942 spin_unlock_bh(&conn->cmd_lock);
3943
3944 iscsit_increment_maxcmdsn(cmd, sess);
3945
3946 iscsit_free_cmd(cmd);
3947
3948 spin_lock_bh(&conn->cmd_lock);
3949 }
3950 spin_unlock_bh(&conn->cmd_lock);
3951 }
3952
3953 static void iscsit_stop_timers_for_cmds(
3954 struct iscsi_conn *conn)
3955 {
3956 struct iscsi_cmd *cmd;
3957
3958 spin_lock_bh(&conn->cmd_lock);
3959 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
3960 if (cmd->data_direction == DMA_TO_DEVICE)
3961 iscsit_stop_dataout_timer(cmd);
3962 }
3963 spin_unlock_bh(&conn->cmd_lock);
3964 }
3965
3966 int iscsit_close_connection(
3967 struct iscsi_conn *conn)
3968 {
3969 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3970 struct iscsi_session *sess = conn->sess;
3971
3972 pr_debug("Closing iSCSI connection CID %hu on SID:"
3973 " %u\n", conn->cid, sess->sid);
3974 /*
3975 * Always up conn_logout_comp just in case the RX Thread is sleeping
3976 * and the logout response never got sent because the connection
3977 * failed.
3978 */
3979 complete(&conn->conn_logout_comp);
3980
3981 iscsi_release_thread_set(conn);
3982
3983 iscsit_stop_timers_for_cmds(conn);
3984 iscsit_stop_nopin_response_timer(conn);
3985 iscsit_stop_nopin_timer(conn);
3986 iscsit_free_queue_reqs_for_conn(conn);
3987
3988 /*
3989 * During Connection recovery drop unacknowledged out of order
3990 * commands for this connection, and prepare the other commands
3991 * for realligence.
3992 *
3993 * During normal operation clear the out of order commands (but
3994 * do not free the struct iscsi_ooo_cmdsn's) and release all
3995 * struct iscsi_cmds.
3996 */
3997 if (atomic_read(&conn->connection_recovery)) {
3998 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
3999 iscsit_prepare_cmds_for_realligance(conn);
4000 } else {
4001 iscsit_clear_ooo_cmdsns_for_conn(conn);
4002 iscsit_release_commands_from_conn(conn);
4003 }
4004
4005 /*
4006 * Handle decrementing session or connection usage count if
4007 * a logout response was not able to be sent because the
4008 * connection failed. Fall back to Session Recovery here.
4009 */
4010 if (atomic_read(&conn->conn_logout_remove)) {
4011 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4012 iscsit_dec_conn_usage_count(conn);
4013 iscsit_dec_session_usage_count(sess);
4014 }
4015 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4016 iscsit_dec_conn_usage_count(conn);
4017
4018 atomic_set(&conn->conn_logout_remove, 0);
4019 atomic_set(&sess->session_reinstatement, 0);
4020 atomic_set(&sess->session_fall_back_to_erl0, 1);
4021 }
4022
4023 spin_lock_bh(&sess->conn_lock);
4024 list_del(&conn->conn_list);
4025
4026 /*
4027 * Attempt to let the Initiator know this connection failed by
4028 * sending an Connection Dropped Async Message on another
4029 * active connection.
4030 */
4031 if (atomic_read(&conn->connection_recovery))
4032 iscsit_build_conn_drop_async_message(conn);
4033
4034 spin_unlock_bh(&sess->conn_lock);
4035
4036 /*
4037 * If connection reinstatement is being performed on this connection,
4038 * up the connection reinstatement semaphore that is being blocked on
4039 * in iscsit_cause_connection_reinstatement().
4040 */
4041 spin_lock_bh(&conn->state_lock);
4042 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4043 spin_unlock_bh(&conn->state_lock);
4044 complete(&conn->conn_wait_comp);
4045 wait_for_completion(&conn->conn_post_wait_comp);
4046 spin_lock_bh(&conn->state_lock);
4047 }
4048
4049 /*
4050 * If connection reinstatement is being performed on this connection
4051 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4052 * connection wait rcfr semaphore that is being blocked on
4053 * an iscsit_connection_reinstatement_rcfr().
4054 */
4055 if (atomic_read(&conn->connection_wait_rcfr)) {
4056 spin_unlock_bh(&conn->state_lock);
4057 complete(&conn->conn_wait_rcfr_comp);
4058 wait_for_completion(&conn->conn_post_wait_comp);
4059 spin_lock_bh(&conn->state_lock);
4060 }
4061 atomic_set(&conn->connection_reinstatement, 1);
4062 spin_unlock_bh(&conn->state_lock);
4063
4064 /*
4065 * If any other processes are accessing this connection pointer we
4066 * must wait until they have completed.
4067 */
4068 iscsit_check_conn_usage_count(conn);
4069
4070 if (conn->conn_rx_hash.tfm)
4071 crypto_free_hash(conn->conn_rx_hash.tfm);
4072 if (conn->conn_tx_hash.tfm)
4073 crypto_free_hash(conn->conn_tx_hash.tfm);
4074
4075 if (conn->conn_cpumask)
4076 free_cpumask_var(conn->conn_cpumask);
4077
4078 kfree(conn->conn_ops);
4079 conn->conn_ops = NULL;
4080
4081 if (conn->sock) {
4082 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
4083 kfree(conn->sock->file);
4084 conn->sock->file = NULL;
4085 }
4086 sock_release(conn->sock);
4087 }
4088 conn->thread_set = NULL;
4089
4090 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4091 conn->conn_state = TARG_CONN_STATE_FREE;
4092 kfree(conn);
4093
4094 spin_lock_bh(&sess->conn_lock);
4095 atomic_dec(&sess->nconn);
4096 pr_debug("Decremented iSCSI connection count to %hu from node:"
4097 " %s\n", atomic_read(&sess->nconn),
4098 sess->sess_ops->InitiatorName);
4099 /*
4100 * Make sure that if one connection fails in an non ERL=2 iSCSI
4101 * Session that they all fail.
4102 */
4103 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4104 !atomic_read(&sess->session_logout))
4105 atomic_set(&sess->session_fall_back_to_erl0, 1);
4106
4107 /*
4108 * If this was not the last connection in the session, and we are
4109 * performing session reinstatement or falling back to ERL=0, call
4110 * iscsit_stop_session() without sleeping to shutdown the other
4111 * active connections.
4112 */
4113 if (atomic_read(&sess->nconn)) {
4114 if (!atomic_read(&sess->session_reinstatement) &&
4115 !atomic_read(&sess->session_fall_back_to_erl0)) {
4116 spin_unlock_bh(&sess->conn_lock);
4117 return 0;
4118 }
4119 if (!atomic_read(&sess->session_stop_active)) {
4120 atomic_set(&sess->session_stop_active, 1);
4121 spin_unlock_bh(&sess->conn_lock);
4122 iscsit_stop_session(sess, 0, 0);
4123 return 0;
4124 }
4125 spin_unlock_bh(&sess->conn_lock);
4126 return 0;
4127 }
4128
4129 /*
4130 * If this was the last connection in the session and one of the
4131 * following is occurring:
4132 *
4133 * Session Reinstatement is not being performed, and are falling back
4134 * to ERL=0 call iscsit_close_session().
4135 *
4136 * Session Logout was requested. iscsit_close_session() will be called
4137 * elsewhere.
4138 *
4139 * Session Continuation is not being performed, start the Time2Retain
4140 * handler and check if sleep_on_sess_wait_sem is active.
4141 */
4142 if (!atomic_read(&sess->session_reinstatement) &&
4143 atomic_read(&sess->session_fall_back_to_erl0)) {
4144 spin_unlock_bh(&sess->conn_lock);
4145 iscsit_close_session(sess);
4146
4147 return 0;
4148 } else if (atomic_read(&sess->session_logout)) {
4149 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4150 sess->session_state = TARG_SESS_STATE_FREE;
4151 spin_unlock_bh(&sess->conn_lock);
4152
4153 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4154 complete(&sess->session_wait_comp);
4155
4156 return 0;
4157 } else {
4158 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4159 sess->session_state = TARG_SESS_STATE_FAILED;
4160
4161 if (!atomic_read(&sess->session_continuation)) {
4162 spin_unlock_bh(&sess->conn_lock);
4163 iscsit_start_time2retain_handler(sess);
4164 } else
4165 spin_unlock_bh(&sess->conn_lock);
4166
4167 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4168 complete(&sess->session_wait_comp);
4169
4170 return 0;
4171 }
4172 spin_unlock_bh(&sess->conn_lock);
4173
4174 return 0;
4175 }
4176
4177 int iscsit_close_session(struct iscsi_session *sess)
4178 {
4179 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4180 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4181
4182 if (atomic_read(&sess->nconn)) {
4183 pr_err("%d connection(s) still exist for iSCSI session"
4184 " to %s\n", atomic_read(&sess->nconn),
4185 sess->sess_ops->InitiatorName);
4186 BUG();
4187 }
4188
4189 spin_lock_bh(&se_tpg->session_lock);
4190 atomic_set(&sess->session_logout, 1);
4191 atomic_set(&sess->session_reinstatement, 1);
4192 iscsit_stop_time2retain_timer(sess);
4193 spin_unlock_bh(&se_tpg->session_lock);
4194
4195 /*
4196 * transport_deregister_session_configfs() will clear the
4197 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4198 * can be setting it again with __transport_register_session() in
4199 * iscsi_post_login_handler() again after the iscsit_stop_session()
4200 * completes in iscsi_np context.
4201 */
4202 transport_deregister_session_configfs(sess->se_sess);
4203
4204 /*
4205 * If any other processes are accessing this session pointer we must
4206 * wait until they have completed. If we are in an interrupt (the
4207 * time2retain handler) and contain and active session usage count we
4208 * restart the timer and exit.
4209 */
4210 if (!in_interrupt()) {
4211 if (iscsit_check_session_usage_count(sess) == 1)
4212 iscsit_stop_session(sess, 1, 1);
4213 } else {
4214 if (iscsit_check_session_usage_count(sess) == 2) {
4215 atomic_set(&sess->session_logout, 0);
4216 iscsit_start_time2retain_handler(sess);
4217 return 0;
4218 }
4219 }
4220
4221 transport_deregister_session(sess->se_sess);
4222
4223 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4224 iscsit_free_connection_recovery_entires(sess);
4225
4226 iscsit_free_all_ooo_cmdsns(sess);
4227
4228 spin_lock_bh(&se_tpg->session_lock);
4229 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4230 sess->session_state = TARG_SESS_STATE_FREE;
4231 pr_debug("Released iSCSI session from node: %s\n",
4232 sess->sess_ops->InitiatorName);
4233 tpg->nsessions--;
4234 if (tpg->tpg_tiqn)
4235 tpg->tpg_tiqn->tiqn_nsessions--;
4236
4237 pr_debug("Decremented number of active iSCSI Sessions on"
4238 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4239
4240 spin_lock(&sess_idr_lock);
4241 idr_remove(&sess_idr, sess->session_index);
4242 spin_unlock(&sess_idr_lock);
4243
4244 kfree(sess->sess_ops);
4245 sess->sess_ops = NULL;
4246 spin_unlock_bh(&se_tpg->session_lock);
4247
4248 kfree(sess);
4249 return 0;
4250 }
4251
4252 static void iscsit_logout_post_handler_closesession(
4253 struct iscsi_conn *conn)
4254 {
4255 struct iscsi_session *sess = conn->sess;
4256
4257 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4258 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4259
4260 atomic_set(&conn->conn_logout_remove, 0);
4261 complete(&conn->conn_logout_comp);
4262
4263 iscsit_dec_conn_usage_count(conn);
4264 iscsit_stop_session(sess, 1, 1);
4265 iscsit_dec_session_usage_count(sess);
4266 iscsit_close_session(sess);
4267 }
4268
4269 static void iscsit_logout_post_handler_samecid(
4270 struct iscsi_conn *conn)
4271 {
4272 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4273 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4274
4275 atomic_set(&conn->conn_logout_remove, 0);
4276 complete(&conn->conn_logout_comp);
4277
4278 iscsit_cause_connection_reinstatement(conn, 1);
4279 iscsit_dec_conn_usage_count(conn);
4280 }
4281
4282 static void iscsit_logout_post_handler_diffcid(
4283 struct iscsi_conn *conn,
4284 u16 cid)
4285 {
4286 struct iscsi_conn *l_conn;
4287 struct iscsi_session *sess = conn->sess;
4288
4289 if (!sess)
4290 return;
4291
4292 spin_lock_bh(&sess->conn_lock);
4293 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4294 if (l_conn->cid == cid) {
4295 iscsit_inc_conn_usage_count(l_conn);
4296 break;
4297 }
4298 }
4299 spin_unlock_bh(&sess->conn_lock);
4300
4301 if (!l_conn)
4302 return;
4303
4304 if (l_conn->sock)
4305 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4306
4307 spin_lock_bh(&l_conn->state_lock);
4308 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4309 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4310 spin_unlock_bh(&l_conn->state_lock);
4311
4312 iscsit_cause_connection_reinstatement(l_conn, 1);
4313 iscsit_dec_conn_usage_count(l_conn);
4314 }
4315
4316 /*
4317 * Return of 0 causes the TX thread to restart.
4318 */
4319 static int iscsit_logout_post_handler(
4320 struct iscsi_cmd *cmd,
4321 struct iscsi_conn *conn)
4322 {
4323 int ret = 0;
4324
4325 switch (cmd->logout_reason) {
4326 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4327 switch (cmd->logout_response) {
4328 case ISCSI_LOGOUT_SUCCESS:
4329 case ISCSI_LOGOUT_CLEANUP_FAILED:
4330 default:
4331 iscsit_logout_post_handler_closesession(conn);
4332 break;
4333 }
4334 ret = 0;
4335 break;
4336 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4337 if (conn->cid == cmd->logout_cid) {
4338 switch (cmd->logout_response) {
4339 case ISCSI_LOGOUT_SUCCESS:
4340 case ISCSI_LOGOUT_CLEANUP_FAILED:
4341 default:
4342 iscsit_logout_post_handler_samecid(conn);
4343 break;
4344 }
4345 ret = 0;
4346 } else {
4347 switch (cmd->logout_response) {
4348 case ISCSI_LOGOUT_SUCCESS:
4349 iscsit_logout_post_handler_diffcid(conn,
4350 cmd->logout_cid);
4351 break;
4352 case ISCSI_LOGOUT_CID_NOT_FOUND:
4353 case ISCSI_LOGOUT_CLEANUP_FAILED:
4354 default:
4355 break;
4356 }
4357 ret = 1;
4358 }
4359 break;
4360 case ISCSI_LOGOUT_REASON_RECOVERY:
4361 switch (cmd->logout_response) {
4362 case ISCSI_LOGOUT_SUCCESS:
4363 case ISCSI_LOGOUT_CID_NOT_FOUND:
4364 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4365 case ISCSI_LOGOUT_CLEANUP_FAILED:
4366 default:
4367 break;
4368 }
4369 ret = 1;
4370 break;
4371 default:
4372 break;
4373
4374 }
4375 return ret;
4376 }
4377
4378 void iscsit_fail_session(struct iscsi_session *sess)
4379 {
4380 struct iscsi_conn *conn;
4381
4382 spin_lock_bh(&sess->conn_lock);
4383 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4384 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4385 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4386 }
4387 spin_unlock_bh(&sess->conn_lock);
4388
4389 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4390 sess->session_state = TARG_SESS_STATE_FAILED;
4391 }
4392
4393 int iscsit_free_session(struct iscsi_session *sess)
4394 {
4395 u16 conn_count = atomic_read(&sess->nconn);
4396 struct iscsi_conn *conn, *conn_tmp = NULL;
4397 int is_last;
4398
4399 spin_lock_bh(&sess->conn_lock);
4400 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4401
4402 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4403 conn_list) {
4404 if (conn_count == 0)
4405 break;
4406
4407 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4408 is_last = 1;
4409 } else {
4410 iscsit_inc_conn_usage_count(conn_tmp);
4411 is_last = 0;
4412 }
4413 iscsit_inc_conn_usage_count(conn);
4414
4415 spin_unlock_bh(&sess->conn_lock);
4416 iscsit_cause_connection_reinstatement(conn, 1);
4417 spin_lock_bh(&sess->conn_lock);
4418
4419 iscsit_dec_conn_usage_count(conn);
4420 if (is_last == 0)
4421 iscsit_dec_conn_usage_count(conn_tmp);
4422
4423 conn_count--;
4424 }
4425
4426 if (atomic_read(&sess->nconn)) {
4427 spin_unlock_bh(&sess->conn_lock);
4428 wait_for_completion(&sess->session_wait_comp);
4429 } else
4430 spin_unlock_bh(&sess->conn_lock);
4431
4432 iscsit_close_session(sess);
4433 return 0;
4434 }
4435
4436 void iscsit_stop_session(
4437 struct iscsi_session *sess,
4438 int session_sleep,
4439 int connection_sleep)
4440 {
4441 u16 conn_count = atomic_read(&sess->nconn);
4442 struct iscsi_conn *conn, *conn_tmp = NULL;
4443 int is_last;
4444
4445 spin_lock_bh(&sess->conn_lock);
4446 if (session_sleep)
4447 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4448
4449 if (connection_sleep) {
4450 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4451 conn_list) {
4452 if (conn_count == 0)
4453 break;
4454
4455 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4456 is_last = 1;
4457 } else {
4458 iscsit_inc_conn_usage_count(conn_tmp);
4459 is_last = 0;
4460 }
4461 iscsit_inc_conn_usage_count(conn);
4462
4463 spin_unlock_bh(&sess->conn_lock);
4464 iscsit_cause_connection_reinstatement(conn, 1);
4465 spin_lock_bh(&sess->conn_lock);
4466
4467 iscsit_dec_conn_usage_count(conn);
4468 if (is_last == 0)
4469 iscsit_dec_conn_usage_count(conn_tmp);
4470 conn_count--;
4471 }
4472 } else {
4473 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4474 iscsit_cause_connection_reinstatement(conn, 0);
4475 }
4476
4477 if (session_sleep && atomic_read(&sess->nconn)) {
4478 spin_unlock_bh(&sess->conn_lock);
4479 wait_for_completion(&sess->session_wait_comp);
4480 } else
4481 spin_unlock_bh(&sess->conn_lock);
4482 }
4483
4484 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4485 {
4486 struct iscsi_session *sess;
4487 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4488 struct se_session *se_sess, *se_sess_tmp;
4489 int session_count = 0;
4490
4491 spin_lock_bh(&se_tpg->session_lock);
4492 if (tpg->nsessions && !force) {
4493 spin_unlock_bh(&se_tpg->session_lock);
4494 return -1;
4495 }
4496
4497 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4498 sess_list) {
4499 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4500
4501 spin_lock(&sess->conn_lock);
4502 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4503 atomic_read(&sess->session_logout) ||
4504 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4505 spin_unlock(&sess->conn_lock);
4506 continue;
4507 }
4508 atomic_set(&sess->session_reinstatement, 1);
4509 spin_unlock(&sess->conn_lock);
4510 spin_unlock_bh(&se_tpg->session_lock);
4511
4512 iscsit_free_session(sess);
4513 spin_lock_bh(&se_tpg->session_lock);
4514
4515 session_count++;
4516 }
4517 spin_unlock_bh(&se_tpg->session_lock);
4518
4519 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4520 " Group: %hu\n", session_count, tpg->tpgt);
4521 return 0;
4522 }
4523
4524 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4525 MODULE_VERSION("4.1.x");
4526 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4527 MODULE_LICENSE("GPL");
4528
4529 module_init(iscsi_target_init_module);
4530 module_exit(iscsi_target_cleanup_module);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree