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target: Address legacy PYX_TRANSPORT_* return code breakage
[deliverable/linux.git] / drivers / target / iscsi / iscsi_target.c
1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
5 *
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
7 *
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
20
21 #include <linux/string.h>
22 #include <linux/kthread.h>
23 #include <linux/crypto.h>
24 #include <linux/completion.h>
25 #include <linux/module.h>
26 #include <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 = kzalloc(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 memcpy(cmd->buf_ptr, buf, ISCSI_HDR_LEN);
624
625 spin_lock_bh(&conn->cmd_lock);
626 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
627 spin_unlock_bh(&conn->cmd_lock);
628
629 cmd->i_state = ISTATE_SEND_REJECT;
630 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
631
632 ret = wait_for_completion_interruptible(&cmd->reject_comp);
633 if (ret != 0)
634 return -1;
635
636 return (!fail_conn) ? 0 : -1;
637 }
638
639 int iscsit_add_reject_from_cmd(
640 u8 reason,
641 int fail_conn,
642 int add_to_conn,
643 unsigned char *buf,
644 struct iscsi_cmd *cmd)
645 {
646 struct iscsi_conn *conn;
647 struct iscsi_reject *hdr;
648 int ret;
649
650 if (!cmd->conn) {
651 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
652 cmd->init_task_tag);
653 return -1;
654 }
655 conn = cmd->conn;
656
657 cmd->iscsi_opcode = ISCSI_OP_REJECT;
658 if (fail_conn)
659 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
660
661 hdr = (struct iscsi_reject *) cmd->pdu;
662 hdr->reason = reason;
663
664 cmd->buf_ptr = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL);
665 if (!cmd->buf_ptr) {
666 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
667 iscsit_release_cmd(cmd);
668 return -1;
669 }
670 memcpy(cmd->buf_ptr, buf, ISCSI_HDR_LEN);
671
672 if (add_to_conn) {
673 spin_lock_bh(&conn->cmd_lock);
674 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
675 spin_unlock_bh(&conn->cmd_lock);
676 }
677
678 cmd->i_state = ISTATE_SEND_REJECT;
679 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
680
681 ret = wait_for_completion_interruptible(&cmd->reject_comp);
682 if (ret != 0)
683 return -1;
684
685 return (!fail_conn) ? 0 : -1;
686 }
687
688 /*
689 * Map some portion of the allocated scatterlist to an iovec, suitable for
690 * kernel sockets to copy data in/out. This handles both pages and slab-allocated
691 * buffers, since we have been tricky and mapped t_mem_sg to the buffer in
692 * either case (see iscsit_alloc_buffs)
693 */
694 static int iscsit_map_iovec(
695 struct iscsi_cmd *cmd,
696 struct kvec *iov,
697 u32 data_offset,
698 u32 data_length)
699 {
700 u32 i = 0;
701 struct scatterlist *sg;
702 unsigned int page_off;
703
704 /*
705 * We have a private mapping of the allocated pages in t_mem_sg.
706 * At this point, we also know each contains a page.
707 */
708 sg = &cmd->t_mem_sg[data_offset / PAGE_SIZE];
709 page_off = (data_offset % PAGE_SIZE);
710
711 cmd->first_data_sg = sg;
712 cmd->first_data_sg_off = page_off;
713
714 while (data_length) {
715 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
716
717 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
718 iov[i].iov_len = cur_len;
719
720 data_length -= cur_len;
721 page_off = 0;
722 sg = sg_next(sg);
723 i++;
724 }
725
726 cmd->kmapped_nents = i;
727
728 return i;
729 }
730
731 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
732 {
733 u32 i;
734 struct scatterlist *sg;
735
736 sg = cmd->first_data_sg;
737
738 for (i = 0; i < cmd->kmapped_nents; i++)
739 kunmap(sg_page(&sg[i]));
740 }
741
742 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
743 {
744 struct iscsi_cmd *cmd;
745
746 conn->exp_statsn = exp_statsn;
747
748 spin_lock_bh(&conn->cmd_lock);
749 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
750 spin_lock(&cmd->istate_lock);
751 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
752 (cmd->stat_sn < exp_statsn)) {
753 cmd->i_state = ISTATE_REMOVE;
754 spin_unlock(&cmd->istate_lock);
755 iscsit_add_cmd_to_immediate_queue(cmd, conn,
756 cmd->i_state);
757 continue;
758 }
759 spin_unlock(&cmd->istate_lock);
760 }
761 spin_unlock_bh(&conn->cmd_lock);
762 }
763
764 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
765 {
766 u32 iov_count = (cmd->se_cmd.t_data_nents == 0) ? 1 :
767 cmd->se_cmd.t_data_nents;
768
769 iov_count += ISCSI_IOV_DATA_BUFFER;
770
771 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
772 if (!cmd->iov_data) {
773 pr_err("Unable to allocate cmd->iov_data\n");
774 return -ENOMEM;
775 }
776
777 cmd->orig_iov_data_count = iov_count;
778 return 0;
779 }
780
781 static int iscsit_alloc_buffs(struct iscsi_cmd *cmd)
782 {
783 struct scatterlist *sgl;
784 u32 length = cmd->se_cmd.data_length;
785 int nents = DIV_ROUND_UP(length, PAGE_SIZE);
786 int i = 0, ret;
787 /*
788 * If no SCSI payload is present, allocate the default iovecs used for
789 * iSCSI PDU Header
790 */
791 if (!length)
792 return iscsit_allocate_iovecs(cmd);
793
794 sgl = kzalloc(sizeof(*sgl) * nents, GFP_KERNEL);
795 if (!sgl)
796 return -ENOMEM;
797
798 sg_init_table(sgl, nents);
799
800 while (length) {
801 int buf_size = min_t(int, length, PAGE_SIZE);
802 struct page *page;
803
804 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
805 if (!page)
806 goto page_alloc_failed;
807
808 sg_set_page(&sgl[i], page, buf_size, 0);
809
810 length -= buf_size;
811 i++;
812 }
813
814 cmd->t_mem_sg = sgl;
815 cmd->t_mem_sg_nents = nents;
816
817 /* BIDI ops not supported */
818
819 /* Tell the core about our preallocated memory */
820 transport_generic_map_mem_to_cmd(&cmd->se_cmd, sgl, nents, NULL, 0);
821 /*
822 * Allocate iovecs for SCSI payload after transport_generic_map_mem_to_cmd
823 * so that cmd->se_cmd.t_tasks_se_num has been set.
824 */
825 ret = iscsit_allocate_iovecs(cmd);
826 if (ret < 0)
827 goto page_alloc_failed;
828
829 return 0;
830
831 page_alloc_failed:
832 while (i >= 0) {
833 __free_page(sg_page(&sgl[i]));
834 i--;
835 }
836 kfree(cmd->t_mem_sg);
837 cmd->t_mem_sg = NULL;
838 return -ENOMEM;
839 }
840
841 static int iscsit_handle_scsi_cmd(
842 struct iscsi_conn *conn,
843 unsigned char *buf)
844 {
845 int data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
846 int dump_immediate_data = 0, send_check_condition = 0, payload_length;
847 struct iscsi_cmd *cmd = NULL;
848 struct iscsi_scsi_req *hdr;
849
850 spin_lock_bh(&conn->sess->session_stats_lock);
851 conn->sess->cmd_pdus++;
852 if (conn->sess->se_sess->se_node_acl) {
853 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
854 conn->sess->se_sess->se_node_acl->num_cmds++;
855 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
856 }
857 spin_unlock_bh(&conn->sess->session_stats_lock);
858
859 hdr = (struct iscsi_scsi_req *) buf;
860 payload_length = ntoh24(hdr->dlength);
861 hdr->itt = be32_to_cpu(hdr->itt);
862 hdr->data_length = be32_to_cpu(hdr->data_length);
863 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
864 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
865
866 /* FIXME; Add checks for AdditionalHeaderSegment */
867
868 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
869 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
870 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
871 " not set. Bad iSCSI Initiator.\n");
872 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
873 buf, conn);
874 }
875
876 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
877 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
878 /*
879 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
880 * that adds support for RESERVE/RELEASE. There is a bug
881 * add with this new functionality that sets R/W bits when
882 * neither CDB carries any READ or WRITE datapayloads.
883 */
884 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
885 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
886 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
887 goto done;
888 }
889
890 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
891 " set when Expected Data Transfer Length is 0 for"
892 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
893 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
894 buf, conn);
895 }
896 done:
897
898 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
899 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
900 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
901 " MUST be set if Expected Data Transfer Length is not 0."
902 " Bad iSCSI Initiator\n");
903 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
904 buf, conn);
905 }
906
907 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
908 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
909 pr_err("Bidirectional operations not supported!\n");
910 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
911 buf, conn);
912 }
913
914 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
915 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
916 " Scsi Command PDU.\n");
917 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
918 buf, conn);
919 }
920
921 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
922 pr_err("ImmediateData=No but DataSegmentLength=%u,"
923 " protocol error.\n", payload_length);
924 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
925 buf, conn);
926 }
927
928 if ((hdr->data_length == payload_length) &&
929 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
930 pr_err("Expected Data Transfer Length and Length of"
931 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
932 " bit is not set protocol error\n");
933 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
934 buf, conn);
935 }
936
937 if (payload_length > hdr->data_length) {
938 pr_err("DataSegmentLength: %u is greater than"
939 " EDTL: %u, protocol error.\n", payload_length,
940 hdr->data_length);
941 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
942 buf, conn);
943 }
944
945 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
946 pr_err("DataSegmentLength: %u is greater than"
947 " MaxRecvDataSegmentLength: %u, protocol error.\n",
948 payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
949 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
950 buf, conn);
951 }
952
953 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
954 pr_err("DataSegmentLength: %u is greater than"
955 " FirstBurstLength: %u, protocol error.\n",
956 payload_length, conn->sess->sess_ops->FirstBurstLength);
957 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
958 buf, conn);
959 }
960
961 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
962 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
963 DMA_NONE;
964
965 cmd = iscsit_allocate_se_cmd(conn, hdr->data_length, data_direction,
966 (hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK));
967 if (!cmd)
968 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
969 buf, conn);
970
971 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
972 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
973 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
974
975 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
976 cmd->i_state = ISTATE_NEW_CMD;
977 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
978 cmd->immediate_data = (payload_length) ? 1 : 0;
979 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
980 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
981 if (cmd->unsolicited_data)
982 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
983
984 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
985 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
986 spin_lock_bh(&conn->sess->ttt_lock);
987 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
988 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
989 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
990 spin_unlock_bh(&conn->sess->ttt_lock);
991 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
992 cmd->targ_xfer_tag = 0xFFFFFFFF;
993 cmd->cmd_sn = hdr->cmdsn;
994 cmd->exp_stat_sn = hdr->exp_statsn;
995 cmd->first_burst_len = payload_length;
996
997 if (cmd->data_direction == DMA_FROM_DEVICE) {
998 struct iscsi_datain_req *dr;
999
1000 dr = iscsit_allocate_datain_req();
1001 if (!dr)
1002 return iscsit_add_reject_from_cmd(
1003 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1004 1, 1, buf, cmd);
1005
1006 iscsit_attach_datain_req(cmd, dr);
1007 }
1008
1009 /*
1010 * The CDB is going to an se_device_t.
1011 */
1012 ret = iscsit_get_lun_for_cmd(cmd, hdr->cdb,
1013 get_unaligned_le64(&hdr->lun));
1014 if (ret < 0) {
1015 if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
1016 pr_debug("Responding to non-acl'ed,"
1017 " non-existent or non-exported iSCSI LUN:"
1018 " 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
1019 }
1020 send_check_condition = 1;
1021 goto attach_cmd;
1022 }
1023 /*
1024 * The Initiator Node has access to the LUN (the addressing method
1025 * is handled inside of iscsit_get_lun_for_cmd()). Now it's time to
1026 * allocate 1->N transport tasks (depending on sector count and
1027 * maximum request size the physical HBA(s) can handle.
1028 */
1029 transport_ret = transport_generic_allocate_tasks(&cmd->se_cmd, hdr->cdb);
1030 if (transport_ret == -ENOMEM) {
1031 return iscsit_add_reject_from_cmd(
1032 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1033 1, 1, buf, cmd);
1034 } else if (transport_ret == -EINVAL) {
1035 /*
1036 * Unsupported SAM Opcode. CHECK_CONDITION will be sent
1037 * in iscsit_execute_cmd() during the CmdSN OOO Execution
1038 * Mechinism.
1039 */
1040 send_check_condition = 1;
1041 } else {
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->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->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->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->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->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3132 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3133 cmd->stat_sn = conn->stat_sn++;
3134 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3135
3136 iscsit_increment_maxcmdsn(cmd, conn->sess);
3137 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3138 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3139
3140 cmd->iov_misc[0].iov_base = cmd->pdu;
3141 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3142 tx_size += ISCSI_HDR_LEN;
3143
3144 if (conn->conn_ops->HeaderDigest) {
3145 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3146
3147 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3148 (unsigned char *)hdr, ISCSI_HDR_LEN,
3149 0, NULL, (u8 *)header_digest);
3150
3151 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3152 tx_size += ISCSI_CRC_LEN;
3153 pr_debug("Attaching CRC32 HeaderDigest for Task"
3154 " Mgmt Response PDU 0x%08x\n", *header_digest);
3155 }
3156
3157 cmd->iov_misc_count = 1;
3158 cmd->tx_size = tx_size;
3159
3160 pr_debug("Built Task Management Response ITT: 0x%08x,"
3161 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3162 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3163
3164 return 0;
3165 }
3166
3167 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3168 {
3169 char *payload = NULL;
3170 struct iscsi_conn *conn = cmd->conn;
3171 struct iscsi_portal_group *tpg;
3172 struct iscsi_tiqn *tiqn;
3173 struct iscsi_tpg_np *tpg_np;
3174 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3175 unsigned char buf[256];
3176
3177 buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ?
3178 32768 : conn->conn_ops->MaxRecvDataSegmentLength;
3179
3180 memset(buf, 0, 256);
3181
3182 payload = kzalloc(buffer_len, GFP_KERNEL);
3183 if (!payload) {
3184 pr_err("Unable to allocate memory for sendtargets"
3185 " response.\n");
3186 return -ENOMEM;
3187 }
3188
3189 spin_lock(&tiqn_lock);
3190 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3191 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3192 len += 1;
3193
3194 if ((len + payload_len) > buffer_len) {
3195 spin_unlock(&tiqn->tiqn_tpg_lock);
3196 end_of_buf = 1;
3197 goto eob;
3198 }
3199 memcpy((void *)payload + payload_len, buf, len);
3200 payload_len += len;
3201
3202 spin_lock(&tiqn->tiqn_tpg_lock);
3203 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3204
3205 spin_lock(&tpg->tpg_state_lock);
3206 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3207 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3208 spin_unlock(&tpg->tpg_state_lock);
3209 continue;
3210 }
3211 spin_unlock(&tpg->tpg_state_lock);
3212
3213 spin_lock(&tpg->tpg_np_lock);
3214 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3215 tpg_np_list) {
3216 len = sprintf(buf, "TargetAddress="
3217 "%s%s%s:%hu,%hu",
3218 (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
3219 "[" : "", tpg_np->tpg_np->np_ip,
3220 (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
3221 "]" : "", tpg_np->tpg_np->np_port,
3222 tpg->tpgt);
3223 len += 1;
3224
3225 if ((len + payload_len) > buffer_len) {
3226 spin_unlock(&tpg->tpg_np_lock);
3227 spin_unlock(&tiqn->tiqn_tpg_lock);
3228 end_of_buf = 1;
3229 goto eob;
3230 }
3231 memcpy((void *)payload + payload_len, buf, len);
3232 payload_len += len;
3233 }
3234 spin_unlock(&tpg->tpg_np_lock);
3235 }
3236 spin_unlock(&tiqn->tiqn_tpg_lock);
3237 eob:
3238 if (end_of_buf)
3239 break;
3240 }
3241 spin_unlock(&tiqn_lock);
3242
3243 cmd->buf_ptr = payload;
3244
3245 return payload_len;
3246 }
3247
3248 /*
3249 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3250 * MaxRecvDataSegmentLength.
3251 */
3252 static int iscsit_send_text_rsp(
3253 struct iscsi_cmd *cmd,
3254 struct iscsi_conn *conn)
3255 {
3256 struct iscsi_text_rsp *hdr;
3257 struct kvec *iov;
3258 u32 padding = 0, tx_size = 0;
3259 int text_length, iov_count = 0;
3260
3261 text_length = iscsit_build_sendtargets_response(cmd);
3262 if (text_length < 0)
3263 return text_length;
3264
3265 padding = ((-text_length) & 3);
3266 if (padding != 0) {
3267 memset(cmd->buf_ptr + text_length, 0, padding);
3268 pr_debug("Attaching %u additional bytes for"
3269 " padding.\n", padding);
3270 }
3271
3272 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3273 memset(hdr, 0, ISCSI_HDR_LEN);
3274 hdr->opcode = ISCSI_OP_TEXT_RSP;
3275 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3276 hton24(hdr->dlength, text_length);
3277 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3278 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3279 cmd->stat_sn = conn->stat_sn++;
3280 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3281
3282 iscsit_increment_maxcmdsn(cmd, conn->sess);
3283 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3284 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3285
3286 iov = &cmd->iov_misc[0];
3287
3288 iov[iov_count].iov_base = cmd->pdu;
3289 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3290 iov[iov_count].iov_base = cmd->buf_ptr;
3291 iov[iov_count++].iov_len = text_length + padding;
3292
3293 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3294
3295 if (conn->conn_ops->HeaderDigest) {
3296 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3297
3298 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3299 (unsigned char *)hdr, ISCSI_HDR_LEN,
3300 0, NULL, (u8 *)header_digest);
3301
3302 iov[0].iov_len += ISCSI_CRC_LEN;
3303 tx_size += ISCSI_CRC_LEN;
3304 pr_debug("Attaching CRC32 HeaderDigest for"
3305 " Text Response PDU 0x%08x\n", *header_digest);
3306 }
3307
3308 if (conn->conn_ops->DataDigest) {
3309 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3310 cmd->buf_ptr, (text_length + padding),
3311 0, NULL, (u8 *)&cmd->data_crc);
3312
3313 iov[iov_count].iov_base = &cmd->data_crc;
3314 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3315 tx_size += ISCSI_CRC_LEN;
3316
3317 pr_debug("Attaching DataDigest for %u bytes of text"
3318 " data, CRC 0x%08x\n", (text_length + padding),
3319 cmd->data_crc);
3320 }
3321
3322 cmd->iov_misc_count = iov_count;
3323 cmd->tx_size = tx_size;
3324
3325 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3326 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3327 text_length, conn->cid);
3328 return 0;
3329 }
3330
3331 static int iscsit_send_reject(
3332 struct iscsi_cmd *cmd,
3333 struct iscsi_conn *conn)
3334 {
3335 u32 iov_count = 0, tx_size = 0;
3336 struct iscsi_reject *hdr;
3337 struct kvec *iov;
3338
3339 hdr = (struct iscsi_reject *) cmd->pdu;
3340 hdr->opcode = ISCSI_OP_REJECT;
3341 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3342 hton24(hdr->dlength, ISCSI_HDR_LEN);
3343 cmd->stat_sn = conn->stat_sn++;
3344 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3345 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3346 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3347
3348 iov = &cmd->iov_misc[0];
3349
3350 iov[iov_count].iov_base = cmd->pdu;
3351 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3352 iov[iov_count].iov_base = cmd->buf_ptr;
3353 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3354
3355 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3356
3357 if (conn->conn_ops->HeaderDigest) {
3358 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3359
3360 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3361 (unsigned char *)hdr, ISCSI_HDR_LEN,
3362 0, NULL, (u8 *)header_digest);
3363
3364 iov[0].iov_len += ISCSI_CRC_LEN;
3365 tx_size += ISCSI_CRC_LEN;
3366 pr_debug("Attaching CRC32 HeaderDigest for"
3367 " REJECT PDU 0x%08x\n", *header_digest);
3368 }
3369
3370 if (conn->conn_ops->DataDigest) {
3371 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3372 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3373 0, NULL, (u8 *)&cmd->data_crc);
3374
3375 iov[iov_count].iov_base = &cmd->data_crc;
3376 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3377 tx_size += ISCSI_CRC_LEN;
3378 pr_debug("Attaching CRC32 DataDigest for REJECT"
3379 " PDU 0x%08x\n", cmd->data_crc);
3380 }
3381
3382 cmd->iov_misc_count = iov_count;
3383 cmd->tx_size = tx_size;
3384
3385 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3386 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3387
3388 return 0;
3389 }
3390
3391 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
3392 {
3393 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
3394 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
3395 wait_for_completion_interruptible_timeout(
3396 &conn->tx_half_close_comp,
3397 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
3398 }
3399 }
3400
3401 #ifdef CONFIG_SMP
3402
3403 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3404 {
3405 struct iscsi_thread_set *ts = conn->thread_set;
3406 int ord, cpu;
3407 /*
3408 * thread_id is assigned from iscsit_global->ts_bitmap from
3409 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3410 *
3411 * Here we use thread_id to determine which CPU that this
3412 * iSCSI connection's iscsi_thread_set will be scheduled to
3413 * execute upon.
3414 */
3415 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3416 #if 0
3417 pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from"
3418 " thread_id: %d\n", ord, ts->thread_id);
3419 #endif
3420 for_each_online_cpu(cpu) {
3421 if (ord-- == 0) {
3422 cpumask_set_cpu(cpu, conn->conn_cpumask);
3423 return;
3424 }
3425 }
3426 /*
3427 * This should never be reached..
3428 */
3429 dump_stack();
3430 cpumask_setall(conn->conn_cpumask);
3431 }
3432
3433 static inline void iscsit_thread_check_cpumask(
3434 struct iscsi_conn *conn,
3435 struct task_struct *p,
3436 int mode)
3437 {
3438 char buf[128];
3439 /*
3440 * mode == 1 signals iscsi_target_tx_thread() usage.
3441 * mode == 0 signals iscsi_target_rx_thread() usage.
3442 */
3443 if (mode == 1) {
3444 if (!conn->conn_tx_reset_cpumask)
3445 return;
3446 conn->conn_tx_reset_cpumask = 0;
3447 } else {
3448 if (!conn->conn_rx_reset_cpumask)
3449 return;
3450 conn->conn_rx_reset_cpumask = 0;
3451 }
3452 /*
3453 * Update the CPU mask for this single kthread so that
3454 * both TX and RX kthreads are scheduled to run on the
3455 * same CPU.
3456 */
3457 memset(buf, 0, 128);
3458 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3459 #if 0
3460 pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():"
3461 " %s for %s\n", buf, p->comm);
3462 #endif
3463 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3464 }
3465
3466 #else
3467
3468 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3469 {
3470 return;
3471 }
3472
3473 #define iscsit_thread_check_cpumask(X, Y, Z) ({})
3474 #endif /* CONFIG_SMP */
3475
3476 int iscsi_target_tx_thread(void *arg)
3477 {
3478 u8 state;
3479 int eodr = 0;
3480 int ret = 0;
3481 int sent_status = 0;
3482 int use_misc = 0;
3483 int map_sg = 0;
3484 struct iscsi_cmd *cmd = NULL;
3485 struct iscsi_conn *conn;
3486 struct iscsi_queue_req *qr = NULL;
3487 struct se_cmd *se_cmd;
3488 struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3489 /*
3490 * Allow ourselves to be interrupted by SIGINT so that a
3491 * connection recovery / failure event can be triggered externally.
3492 */
3493 allow_signal(SIGINT);
3494
3495 restart:
3496 conn = iscsi_tx_thread_pre_handler(ts);
3497 if (!conn)
3498 goto out;
3499
3500 eodr = map_sg = ret = sent_status = use_misc = 0;
3501
3502 while (!kthread_should_stop()) {
3503 /*
3504 * Ensure that both TX and RX per connection kthreads
3505 * are scheduled to run on the same CPU.
3506 */
3507 iscsit_thread_check_cpumask(conn, current, 1);
3508
3509 schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
3510
3511 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3512 signal_pending(current))
3513 goto transport_err;
3514
3515 get_immediate:
3516 qr = iscsit_get_cmd_from_immediate_queue(conn);
3517 if (qr) {
3518 atomic_set(&conn->check_immediate_queue, 0);
3519 cmd = qr->cmd;
3520 state = qr->state;
3521 kmem_cache_free(lio_qr_cache, qr);
3522
3523 spin_lock_bh(&cmd->istate_lock);
3524 switch (state) {
3525 case ISTATE_SEND_R2T:
3526 spin_unlock_bh(&cmd->istate_lock);
3527 ret = iscsit_send_r2t(cmd, conn);
3528 break;
3529 case ISTATE_REMOVE:
3530 spin_unlock_bh(&cmd->istate_lock);
3531
3532 if (cmd->data_direction == DMA_TO_DEVICE)
3533 iscsit_stop_dataout_timer(cmd);
3534
3535 spin_lock_bh(&conn->cmd_lock);
3536 list_del(&cmd->i_list);
3537 spin_unlock_bh(&conn->cmd_lock);
3538
3539 iscsit_free_cmd(cmd);
3540 goto get_immediate;
3541 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3542 spin_unlock_bh(&cmd->istate_lock);
3543 iscsit_mod_nopin_response_timer(conn);
3544 ret = iscsit_send_unsolicited_nopin(cmd,
3545 conn, 1);
3546 break;
3547 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3548 spin_unlock_bh(&cmd->istate_lock);
3549 ret = iscsit_send_unsolicited_nopin(cmd,
3550 conn, 0);
3551 break;
3552 default:
3553 pr_err("Unknown Opcode: 0x%02x ITT:"
3554 " 0x%08x, i_state: %d on CID: %hu\n",
3555 cmd->iscsi_opcode, cmd->init_task_tag, state,
3556 conn->cid);
3557 spin_unlock_bh(&cmd->istate_lock);
3558 goto transport_err;
3559 }
3560 if (ret < 0) {
3561 conn->tx_immediate_queue = 0;
3562 goto transport_err;
3563 }
3564
3565 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3566 conn->tx_immediate_queue = 0;
3567 iscsit_tx_thread_wait_for_tcp(conn);
3568 goto transport_err;
3569 }
3570
3571 spin_lock_bh(&cmd->istate_lock);
3572 switch (state) {
3573 case ISTATE_SEND_R2T:
3574 spin_unlock_bh(&cmd->istate_lock);
3575 spin_lock_bh(&cmd->dataout_timeout_lock);
3576 iscsit_start_dataout_timer(cmd, conn);
3577 spin_unlock_bh(&cmd->dataout_timeout_lock);
3578 break;
3579 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3580 cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE;
3581 spin_unlock_bh(&cmd->istate_lock);
3582 break;
3583 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3584 cmd->i_state = ISTATE_SENT_STATUS;
3585 spin_unlock_bh(&cmd->istate_lock);
3586 break;
3587 default:
3588 pr_err("Unknown Opcode: 0x%02x ITT:"
3589 " 0x%08x, i_state: %d on CID: %hu\n",
3590 cmd->iscsi_opcode, cmd->init_task_tag,
3591 state, conn->cid);
3592 spin_unlock_bh(&cmd->istate_lock);
3593 goto transport_err;
3594 }
3595 goto get_immediate;
3596 } else
3597 conn->tx_immediate_queue = 0;
3598
3599 get_response:
3600 qr = iscsit_get_cmd_from_response_queue(conn);
3601 if (qr) {
3602 cmd = qr->cmd;
3603 state = qr->state;
3604 kmem_cache_free(lio_qr_cache, qr);
3605
3606 spin_lock_bh(&cmd->istate_lock);
3607 check_rsp_state:
3608 switch (state) {
3609 case ISTATE_SEND_DATAIN:
3610 spin_unlock_bh(&cmd->istate_lock);
3611 ret = iscsit_send_data_in(cmd, conn,
3612 &eodr);
3613 map_sg = 1;
3614 break;
3615 case ISTATE_SEND_STATUS:
3616 case ISTATE_SEND_STATUS_RECOVERY:
3617 spin_unlock_bh(&cmd->istate_lock);
3618 use_misc = 1;
3619 ret = iscsit_send_status(cmd, conn);
3620 break;
3621 case ISTATE_SEND_LOGOUTRSP:
3622 spin_unlock_bh(&cmd->istate_lock);
3623 use_misc = 1;
3624 ret = iscsit_send_logout_response(cmd, conn);
3625 break;
3626 case ISTATE_SEND_ASYNCMSG:
3627 spin_unlock_bh(&cmd->istate_lock);
3628 use_misc = 1;
3629 ret = iscsit_send_conn_drop_async_message(
3630 cmd, conn);
3631 break;
3632 case ISTATE_SEND_NOPIN:
3633 spin_unlock_bh(&cmd->istate_lock);
3634 use_misc = 1;
3635 ret = iscsit_send_nopin_response(cmd, conn);
3636 break;
3637 case ISTATE_SEND_REJECT:
3638 spin_unlock_bh(&cmd->istate_lock);
3639 use_misc = 1;
3640 ret = iscsit_send_reject(cmd, conn);
3641 break;
3642 case ISTATE_SEND_TASKMGTRSP:
3643 spin_unlock_bh(&cmd->istate_lock);
3644 use_misc = 1;
3645 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3646 if (ret != 0)
3647 break;
3648 ret = iscsit_tmr_post_handler(cmd, conn);
3649 if (ret != 0)
3650 iscsit_fall_back_to_erl0(conn->sess);
3651 break;
3652 case ISTATE_SEND_TEXTRSP:
3653 spin_unlock_bh(&cmd->istate_lock);
3654 use_misc = 1;
3655 ret = iscsit_send_text_rsp(cmd, conn);
3656 break;
3657 default:
3658 pr_err("Unknown Opcode: 0x%02x ITT:"
3659 " 0x%08x, i_state: %d on CID: %hu\n",
3660 cmd->iscsi_opcode, cmd->init_task_tag,
3661 state, conn->cid);
3662 spin_unlock_bh(&cmd->istate_lock);
3663 goto transport_err;
3664 }
3665 if (ret < 0) {
3666 conn->tx_response_queue = 0;
3667 goto transport_err;
3668 }
3669
3670 se_cmd = &cmd->se_cmd;
3671
3672 if (map_sg && !conn->conn_ops->IFMarker) {
3673 if (iscsit_fe_sendpage_sg(cmd, conn) < 0) {
3674 conn->tx_response_queue = 0;
3675 iscsit_tx_thread_wait_for_tcp(conn);
3676 iscsit_unmap_iovec(cmd);
3677 goto transport_err;
3678 }
3679 } else {
3680 if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) {
3681 conn->tx_response_queue = 0;
3682 iscsit_tx_thread_wait_for_tcp(conn);
3683 iscsit_unmap_iovec(cmd);
3684 goto transport_err;
3685 }
3686 }
3687 map_sg = 0;
3688 iscsit_unmap_iovec(cmd);
3689
3690 spin_lock_bh(&cmd->istate_lock);
3691 switch (state) {
3692 case ISTATE_SEND_DATAIN:
3693 if (!eodr)
3694 goto check_rsp_state;
3695
3696 if (eodr == 1) {
3697 cmd->i_state = ISTATE_SENT_LAST_DATAIN;
3698 sent_status = 1;
3699 eodr = use_misc = 0;
3700 } else if (eodr == 2) {
3701 cmd->i_state = state =
3702 ISTATE_SEND_STATUS;
3703 sent_status = 0;
3704 eodr = use_misc = 0;
3705 goto check_rsp_state;
3706 }
3707 break;
3708 case ISTATE_SEND_STATUS:
3709 use_misc = 0;
3710 sent_status = 1;
3711 break;
3712 case ISTATE_SEND_ASYNCMSG:
3713 case ISTATE_SEND_NOPIN:
3714 case ISTATE_SEND_STATUS_RECOVERY:
3715 case ISTATE_SEND_TEXTRSP:
3716 use_misc = 0;
3717 sent_status = 1;
3718 break;
3719 case ISTATE_SEND_REJECT:
3720 use_misc = 0;
3721 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3722 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3723 spin_unlock_bh(&cmd->istate_lock);
3724 complete(&cmd->reject_comp);
3725 goto transport_err;
3726 }
3727 complete(&cmd->reject_comp);
3728 break;
3729 case ISTATE_SEND_TASKMGTRSP:
3730 use_misc = 0;
3731 sent_status = 1;
3732 break;
3733 case ISTATE_SEND_LOGOUTRSP:
3734 spin_unlock_bh(&cmd->istate_lock);
3735 if (!iscsit_logout_post_handler(cmd, conn))
3736 goto restart;
3737 spin_lock_bh(&cmd->istate_lock);
3738 use_misc = 0;
3739 sent_status = 1;
3740 break;
3741 default:
3742 pr_err("Unknown Opcode: 0x%02x ITT:"
3743 " 0x%08x, i_state: %d on CID: %hu\n",
3744 cmd->iscsi_opcode, cmd->init_task_tag,
3745 cmd->i_state, conn->cid);
3746 spin_unlock_bh(&cmd->istate_lock);
3747 goto transport_err;
3748 }
3749
3750 if (sent_status) {
3751 cmd->i_state = ISTATE_SENT_STATUS;
3752 sent_status = 0;
3753 }
3754 spin_unlock_bh(&cmd->istate_lock);
3755
3756 if (atomic_read(&conn->check_immediate_queue))
3757 goto get_immediate;
3758
3759 goto get_response;
3760 } else
3761 conn->tx_response_queue = 0;
3762 }
3763
3764 transport_err:
3765 iscsit_take_action_for_connection_exit(conn);
3766 goto restart;
3767 out:
3768 return 0;
3769 }
3770
3771 int iscsi_target_rx_thread(void *arg)
3772 {
3773 int ret;
3774 u8 buffer[ISCSI_HDR_LEN], opcode;
3775 u32 checksum = 0, digest = 0;
3776 struct iscsi_conn *conn = NULL;
3777 struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3778 struct kvec iov;
3779 /*
3780 * Allow ourselves to be interrupted by SIGINT so that a
3781 * connection recovery / failure event can be triggered externally.
3782 */
3783 allow_signal(SIGINT);
3784
3785 restart:
3786 conn = iscsi_rx_thread_pre_handler(ts);
3787 if (!conn)
3788 goto out;
3789
3790 while (!kthread_should_stop()) {
3791 /*
3792 * Ensure that both TX and RX per connection kthreads
3793 * are scheduled to run on the same CPU.
3794 */
3795 iscsit_thread_check_cpumask(conn, current, 0);
3796
3797 memset(buffer, 0, ISCSI_HDR_LEN);
3798 memset(&iov, 0, sizeof(struct kvec));
3799
3800 iov.iov_base = buffer;
3801 iov.iov_len = ISCSI_HDR_LEN;
3802
3803 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3804 if (ret != ISCSI_HDR_LEN) {
3805 iscsit_rx_thread_wait_for_tcp(conn);
3806 goto transport_err;
3807 }
3808
3809 /*
3810 * Set conn->bad_hdr for use with REJECT PDUs.
3811 */
3812 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3813
3814 if (conn->conn_ops->HeaderDigest) {
3815 iov.iov_base = &digest;
3816 iov.iov_len = ISCSI_CRC_LEN;
3817
3818 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3819 if (ret != ISCSI_CRC_LEN) {
3820 iscsit_rx_thread_wait_for_tcp(conn);
3821 goto transport_err;
3822 }
3823
3824 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3825 buffer, ISCSI_HDR_LEN,
3826 0, NULL, (u8 *)&checksum);
3827
3828 if (digest != checksum) {
3829 pr_err("HeaderDigest CRC32C failed,"
3830 " received 0x%08x, computed 0x%08x\n",
3831 digest, checksum);
3832 /*
3833 * Set the PDU to 0xff so it will intentionally
3834 * hit default in the switch below.
3835 */
3836 memset(buffer, 0xff, ISCSI_HDR_LEN);
3837 spin_lock_bh(&conn->sess->session_stats_lock);
3838 conn->sess->conn_digest_errors++;
3839 spin_unlock_bh(&conn->sess->session_stats_lock);
3840 } else {
3841 pr_debug("Got HeaderDigest CRC32C"
3842 " 0x%08x\n", checksum);
3843 }
3844 }
3845
3846 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3847 goto transport_err;
3848
3849 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3850
3851 if (conn->sess->sess_ops->SessionType &&
3852 ((!(opcode & ISCSI_OP_TEXT)) ||
3853 (!(opcode & ISCSI_OP_LOGOUT)))) {
3854 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3855 " while in Discovery Session, rejecting.\n", opcode);
3856 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3857 buffer, conn);
3858 goto transport_err;
3859 }
3860
3861 switch (opcode) {
3862 case ISCSI_OP_SCSI_CMD:
3863 if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3864 goto transport_err;
3865 break;
3866 case ISCSI_OP_SCSI_DATA_OUT:
3867 if (iscsit_handle_data_out(conn, buffer) < 0)
3868 goto transport_err;
3869 break;
3870 case ISCSI_OP_NOOP_OUT:
3871 if (iscsit_handle_nop_out(conn, buffer) < 0)
3872 goto transport_err;
3873 break;
3874 case ISCSI_OP_SCSI_TMFUNC:
3875 if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3876 goto transport_err;
3877 break;
3878 case ISCSI_OP_TEXT:
3879 if (iscsit_handle_text_cmd(conn, buffer) < 0)
3880 goto transport_err;
3881 break;
3882 case ISCSI_OP_LOGOUT:
3883 ret = iscsit_handle_logout_cmd(conn, buffer);
3884 if (ret > 0) {
3885 wait_for_completion_timeout(&conn->conn_logout_comp,
3886 SECONDS_FOR_LOGOUT_COMP * HZ);
3887 goto transport_err;
3888 } else if (ret < 0)
3889 goto transport_err;
3890 break;
3891 case ISCSI_OP_SNACK:
3892 if (iscsit_handle_snack(conn, buffer) < 0)
3893 goto transport_err;
3894 break;
3895 default:
3896 pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3897 opcode);
3898 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3899 pr_err("Cannot recover from unknown"
3900 " opcode while ERL=0, closing iSCSI connection"
3901 ".\n");
3902 goto transport_err;
3903 }
3904 if (!conn->conn_ops->OFMarker) {
3905 pr_err("Unable to recover from unknown"
3906 " opcode while OFMarker=No, closing iSCSI"
3907 " connection.\n");
3908 goto transport_err;
3909 }
3910 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3911 pr_err("Unable to recover from unknown"
3912 " opcode, closing iSCSI connection.\n");
3913 goto transport_err;
3914 }
3915 break;
3916 }
3917 }
3918
3919 transport_err:
3920 if (!signal_pending(current))
3921 atomic_set(&conn->transport_failed, 1);
3922 iscsit_take_action_for_connection_exit(conn);
3923 goto restart;
3924 out:
3925 return 0;
3926 }
3927
3928 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3929 {
3930 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3931 struct iscsi_session *sess = conn->sess;
3932 /*
3933 * We expect this function to only ever be called from either RX or TX
3934 * thread context via iscsit_close_connection() once the other context
3935 * has been reset -> returned sleeping pre-handler state.
3936 */
3937 spin_lock_bh(&conn->cmd_lock);
3938 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) {
3939
3940 list_del(&cmd->i_list);
3941 spin_unlock_bh(&conn->cmd_lock);
3942
3943 iscsit_increment_maxcmdsn(cmd, sess);
3944
3945 iscsit_free_cmd(cmd);
3946
3947 spin_lock_bh(&conn->cmd_lock);
3948 }
3949 spin_unlock_bh(&conn->cmd_lock);
3950 }
3951
3952 static void iscsit_stop_timers_for_cmds(
3953 struct iscsi_conn *conn)
3954 {
3955 struct iscsi_cmd *cmd;
3956
3957 spin_lock_bh(&conn->cmd_lock);
3958 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
3959 if (cmd->data_direction == DMA_TO_DEVICE)
3960 iscsit_stop_dataout_timer(cmd);
3961 }
3962 spin_unlock_bh(&conn->cmd_lock);
3963 }
3964
3965 int iscsit_close_connection(
3966 struct iscsi_conn *conn)
3967 {
3968 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3969 struct iscsi_session *sess = conn->sess;
3970
3971 pr_debug("Closing iSCSI connection CID %hu on SID:"
3972 " %u\n", conn->cid, sess->sid);
3973 /*
3974 * Always up conn_logout_comp just in case the RX Thread is sleeping
3975 * and the logout response never got sent because the connection
3976 * failed.
3977 */
3978 complete(&conn->conn_logout_comp);
3979
3980 iscsi_release_thread_set(conn);
3981
3982 iscsit_stop_timers_for_cmds(conn);
3983 iscsit_stop_nopin_response_timer(conn);
3984 iscsit_stop_nopin_timer(conn);
3985 iscsit_free_queue_reqs_for_conn(conn);
3986
3987 /*
3988 * During Connection recovery drop unacknowledged out of order
3989 * commands for this connection, and prepare the other commands
3990 * for realligence.
3991 *
3992 * During normal operation clear the out of order commands (but
3993 * do not free the struct iscsi_ooo_cmdsn's) and release all
3994 * struct iscsi_cmds.
3995 */
3996 if (atomic_read(&conn->connection_recovery)) {
3997 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
3998 iscsit_prepare_cmds_for_realligance(conn);
3999 } else {
4000 iscsit_clear_ooo_cmdsns_for_conn(conn);
4001 iscsit_release_commands_from_conn(conn);
4002 }
4003
4004 /*
4005 * Handle decrementing session or connection usage count if
4006 * a logout response was not able to be sent because the
4007 * connection failed. Fall back to Session Recovery here.
4008 */
4009 if (atomic_read(&conn->conn_logout_remove)) {
4010 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4011 iscsit_dec_conn_usage_count(conn);
4012 iscsit_dec_session_usage_count(sess);
4013 }
4014 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4015 iscsit_dec_conn_usage_count(conn);
4016
4017 atomic_set(&conn->conn_logout_remove, 0);
4018 atomic_set(&sess->session_reinstatement, 0);
4019 atomic_set(&sess->session_fall_back_to_erl0, 1);
4020 }
4021
4022 spin_lock_bh(&sess->conn_lock);
4023 list_del(&conn->conn_list);
4024
4025 /*
4026 * Attempt to let the Initiator know this connection failed by
4027 * sending an Connection Dropped Async Message on another
4028 * active connection.
4029 */
4030 if (atomic_read(&conn->connection_recovery))
4031 iscsit_build_conn_drop_async_message(conn);
4032
4033 spin_unlock_bh(&sess->conn_lock);
4034
4035 /*
4036 * If connection reinstatement is being performed on this connection,
4037 * up the connection reinstatement semaphore that is being blocked on
4038 * in iscsit_cause_connection_reinstatement().
4039 */
4040 spin_lock_bh(&conn->state_lock);
4041 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4042 spin_unlock_bh(&conn->state_lock);
4043 complete(&conn->conn_wait_comp);
4044 wait_for_completion(&conn->conn_post_wait_comp);
4045 spin_lock_bh(&conn->state_lock);
4046 }
4047
4048 /*
4049 * If connection reinstatement is being performed on this connection
4050 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4051 * connection wait rcfr semaphore that is being blocked on
4052 * an iscsit_connection_reinstatement_rcfr().
4053 */
4054 if (atomic_read(&conn->connection_wait_rcfr)) {
4055 spin_unlock_bh(&conn->state_lock);
4056 complete(&conn->conn_wait_rcfr_comp);
4057 wait_for_completion(&conn->conn_post_wait_comp);
4058 spin_lock_bh(&conn->state_lock);
4059 }
4060 atomic_set(&conn->connection_reinstatement, 1);
4061 spin_unlock_bh(&conn->state_lock);
4062
4063 /*
4064 * If any other processes are accessing this connection pointer we
4065 * must wait until they have completed.
4066 */
4067 iscsit_check_conn_usage_count(conn);
4068
4069 if (conn->conn_rx_hash.tfm)
4070 crypto_free_hash(conn->conn_rx_hash.tfm);
4071 if (conn->conn_tx_hash.tfm)
4072 crypto_free_hash(conn->conn_tx_hash.tfm);
4073
4074 if (conn->conn_cpumask)
4075 free_cpumask_var(conn->conn_cpumask);
4076
4077 kfree(conn->conn_ops);
4078 conn->conn_ops = NULL;
4079
4080 if (conn->sock) {
4081 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
4082 kfree(conn->sock->file);
4083 conn->sock->file = NULL;
4084 }
4085 sock_release(conn->sock);
4086 }
4087 conn->thread_set = NULL;
4088
4089 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4090 conn->conn_state = TARG_CONN_STATE_FREE;
4091 kfree(conn);
4092
4093 spin_lock_bh(&sess->conn_lock);
4094 atomic_dec(&sess->nconn);
4095 pr_debug("Decremented iSCSI connection count to %hu from node:"
4096 " %s\n", atomic_read(&sess->nconn),
4097 sess->sess_ops->InitiatorName);
4098 /*
4099 * Make sure that if one connection fails in an non ERL=2 iSCSI
4100 * Session that they all fail.
4101 */
4102 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4103 !atomic_read(&sess->session_logout))
4104 atomic_set(&sess->session_fall_back_to_erl0, 1);
4105
4106 /*
4107 * If this was not the last connection in the session, and we are
4108 * performing session reinstatement or falling back to ERL=0, call
4109 * iscsit_stop_session() without sleeping to shutdown the other
4110 * active connections.
4111 */
4112 if (atomic_read(&sess->nconn)) {
4113 if (!atomic_read(&sess->session_reinstatement) &&
4114 !atomic_read(&sess->session_fall_back_to_erl0)) {
4115 spin_unlock_bh(&sess->conn_lock);
4116 return 0;
4117 }
4118 if (!atomic_read(&sess->session_stop_active)) {
4119 atomic_set(&sess->session_stop_active, 1);
4120 spin_unlock_bh(&sess->conn_lock);
4121 iscsit_stop_session(sess, 0, 0);
4122 return 0;
4123 }
4124 spin_unlock_bh(&sess->conn_lock);
4125 return 0;
4126 }
4127
4128 /*
4129 * If this was the last connection in the session and one of the
4130 * following is occurring:
4131 *
4132 * Session Reinstatement is not being performed, and are falling back
4133 * to ERL=0 call iscsit_close_session().
4134 *
4135 * Session Logout was requested. iscsit_close_session() will be called
4136 * elsewhere.
4137 *
4138 * Session Continuation is not being performed, start the Time2Retain
4139 * handler and check if sleep_on_sess_wait_sem is active.
4140 */
4141 if (!atomic_read(&sess->session_reinstatement) &&
4142 atomic_read(&sess->session_fall_back_to_erl0)) {
4143 spin_unlock_bh(&sess->conn_lock);
4144 iscsit_close_session(sess);
4145
4146 return 0;
4147 } else if (atomic_read(&sess->session_logout)) {
4148 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4149 sess->session_state = TARG_SESS_STATE_FREE;
4150 spin_unlock_bh(&sess->conn_lock);
4151
4152 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4153 complete(&sess->session_wait_comp);
4154
4155 return 0;
4156 } else {
4157 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4158 sess->session_state = TARG_SESS_STATE_FAILED;
4159
4160 if (!atomic_read(&sess->session_continuation)) {
4161 spin_unlock_bh(&sess->conn_lock);
4162 iscsit_start_time2retain_handler(sess);
4163 } else
4164 spin_unlock_bh(&sess->conn_lock);
4165
4166 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4167 complete(&sess->session_wait_comp);
4168
4169 return 0;
4170 }
4171 spin_unlock_bh(&sess->conn_lock);
4172
4173 return 0;
4174 }
4175
4176 int iscsit_close_session(struct iscsi_session *sess)
4177 {
4178 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4179 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4180
4181 if (atomic_read(&sess->nconn)) {
4182 pr_err("%d connection(s) still exist for iSCSI session"
4183 " to %s\n", atomic_read(&sess->nconn),
4184 sess->sess_ops->InitiatorName);
4185 BUG();
4186 }
4187
4188 spin_lock_bh(&se_tpg->session_lock);
4189 atomic_set(&sess->session_logout, 1);
4190 atomic_set(&sess->session_reinstatement, 1);
4191 iscsit_stop_time2retain_timer(sess);
4192 spin_unlock_bh(&se_tpg->session_lock);
4193
4194 /*
4195 * transport_deregister_session_configfs() will clear the
4196 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4197 * can be setting it again with __transport_register_session() in
4198 * iscsi_post_login_handler() again after the iscsit_stop_session()
4199 * completes in iscsi_np context.
4200 */
4201 transport_deregister_session_configfs(sess->se_sess);
4202
4203 /*
4204 * If any other processes are accessing this session pointer we must
4205 * wait until they have completed. If we are in an interrupt (the
4206 * time2retain handler) and contain and active session usage count we
4207 * restart the timer and exit.
4208 */
4209 if (!in_interrupt()) {
4210 if (iscsit_check_session_usage_count(sess) == 1)
4211 iscsit_stop_session(sess, 1, 1);
4212 } else {
4213 if (iscsit_check_session_usage_count(sess) == 2) {
4214 atomic_set(&sess->session_logout, 0);
4215 iscsit_start_time2retain_handler(sess);
4216 return 0;
4217 }
4218 }
4219
4220 transport_deregister_session(sess->se_sess);
4221
4222 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4223 iscsit_free_connection_recovery_entires(sess);
4224
4225 iscsit_free_all_ooo_cmdsns(sess);
4226
4227 spin_lock_bh(&se_tpg->session_lock);
4228 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4229 sess->session_state = TARG_SESS_STATE_FREE;
4230 pr_debug("Released iSCSI session from node: %s\n",
4231 sess->sess_ops->InitiatorName);
4232 tpg->nsessions--;
4233 if (tpg->tpg_tiqn)
4234 tpg->tpg_tiqn->tiqn_nsessions--;
4235
4236 pr_debug("Decremented number of active iSCSI Sessions on"
4237 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4238
4239 spin_lock(&sess_idr_lock);
4240 idr_remove(&sess_idr, sess->session_index);
4241 spin_unlock(&sess_idr_lock);
4242
4243 kfree(sess->sess_ops);
4244 sess->sess_ops = NULL;
4245 spin_unlock_bh(&se_tpg->session_lock);
4246
4247 kfree(sess);
4248 return 0;
4249 }
4250
4251 static void iscsit_logout_post_handler_closesession(
4252 struct iscsi_conn *conn)
4253 {
4254 struct iscsi_session *sess = conn->sess;
4255
4256 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4257 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4258
4259 atomic_set(&conn->conn_logout_remove, 0);
4260 complete(&conn->conn_logout_comp);
4261
4262 iscsit_dec_conn_usage_count(conn);
4263 iscsit_stop_session(sess, 1, 1);
4264 iscsit_dec_session_usage_count(sess);
4265 iscsit_close_session(sess);
4266 }
4267
4268 static void iscsit_logout_post_handler_samecid(
4269 struct iscsi_conn *conn)
4270 {
4271 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4272 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4273
4274 atomic_set(&conn->conn_logout_remove, 0);
4275 complete(&conn->conn_logout_comp);
4276
4277 iscsit_cause_connection_reinstatement(conn, 1);
4278 iscsit_dec_conn_usage_count(conn);
4279 }
4280
4281 static void iscsit_logout_post_handler_diffcid(
4282 struct iscsi_conn *conn,
4283 u16 cid)
4284 {
4285 struct iscsi_conn *l_conn;
4286 struct iscsi_session *sess = conn->sess;
4287
4288 if (!sess)
4289 return;
4290
4291 spin_lock_bh(&sess->conn_lock);
4292 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4293 if (l_conn->cid == cid) {
4294 iscsit_inc_conn_usage_count(l_conn);
4295 break;
4296 }
4297 }
4298 spin_unlock_bh(&sess->conn_lock);
4299
4300 if (!l_conn)
4301 return;
4302
4303 if (l_conn->sock)
4304 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4305
4306 spin_lock_bh(&l_conn->state_lock);
4307 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4308 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4309 spin_unlock_bh(&l_conn->state_lock);
4310
4311 iscsit_cause_connection_reinstatement(l_conn, 1);
4312 iscsit_dec_conn_usage_count(l_conn);
4313 }
4314
4315 /*
4316 * Return of 0 causes the TX thread to restart.
4317 */
4318 static int iscsit_logout_post_handler(
4319 struct iscsi_cmd *cmd,
4320 struct iscsi_conn *conn)
4321 {
4322 int ret = 0;
4323
4324 switch (cmd->logout_reason) {
4325 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4326 switch (cmd->logout_response) {
4327 case ISCSI_LOGOUT_SUCCESS:
4328 case ISCSI_LOGOUT_CLEANUP_FAILED:
4329 default:
4330 iscsit_logout_post_handler_closesession(conn);
4331 break;
4332 }
4333 ret = 0;
4334 break;
4335 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4336 if (conn->cid == cmd->logout_cid) {
4337 switch (cmd->logout_response) {
4338 case ISCSI_LOGOUT_SUCCESS:
4339 case ISCSI_LOGOUT_CLEANUP_FAILED:
4340 default:
4341 iscsit_logout_post_handler_samecid(conn);
4342 break;
4343 }
4344 ret = 0;
4345 } else {
4346 switch (cmd->logout_response) {
4347 case ISCSI_LOGOUT_SUCCESS:
4348 iscsit_logout_post_handler_diffcid(conn,
4349 cmd->logout_cid);
4350 break;
4351 case ISCSI_LOGOUT_CID_NOT_FOUND:
4352 case ISCSI_LOGOUT_CLEANUP_FAILED:
4353 default:
4354 break;
4355 }
4356 ret = 1;
4357 }
4358 break;
4359 case ISCSI_LOGOUT_REASON_RECOVERY:
4360 switch (cmd->logout_response) {
4361 case ISCSI_LOGOUT_SUCCESS:
4362 case ISCSI_LOGOUT_CID_NOT_FOUND:
4363 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4364 case ISCSI_LOGOUT_CLEANUP_FAILED:
4365 default:
4366 break;
4367 }
4368 ret = 1;
4369 break;
4370 default:
4371 break;
4372
4373 }
4374 return ret;
4375 }
4376
4377 void iscsit_fail_session(struct iscsi_session *sess)
4378 {
4379 struct iscsi_conn *conn;
4380
4381 spin_lock_bh(&sess->conn_lock);
4382 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4383 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4384 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4385 }
4386 spin_unlock_bh(&sess->conn_lock);
4387
4388 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4389 sess->session_state = TARG_SESS_STATE_FAILED;
4390 }
4391
4392 int iscsit_free_session(struct iscsi_session *sess)
4393 {
4394 u16 conn_count = atomic_read(&sess->nconn);
4395 struct iscsi_conn *conn, *conn_tmp = NULL;
4396 int is_last;
4397
4398 spin_lock_bh(&sess->conn_lock);
4399 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4400
4401 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4402 conn_list) {
4403 if (conn_count == 0)
4404 break;
4405
4406 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4407 is_last = 1;
4408 } else {
4409 iscsit_inc_conn_usage_count(conn_tmp);
4410 is_last = 0;
4411 }
4412 iscsit_inc_conn_usage_count(conn);
4413
4414 spin_unlock_bh(&sess->conn_lock);
4415 iscsit_cause_connection_reinstatement(conn, 1);
4416 spin_lock_bh(&sess->conn_lock);
4417
4418 iscsit_dec_conn_usage_count(conn);
4419 if (is_last == 0)
4420 iscsit_dec_conn_usage_count(conn_tmp);
4421
4422 conn_count--;
4423 }
4424
4425 if (atomic_read(&sess->nconn)) {
4426 spin_unlock_bh(&sess->conn_lock);
4427 wait_for_completion(&sess->session_wait_comp);
4428 } else
4429 spin_unlock_bh(&sess->conn_lock);
4430
4431 iscsit_close_session(sess);
4432 return 0;
4433 }
4434
4435 void iscsit_stop_session(
4436 struct iscsi_session *sess,
4437 int session_sleep,
4438 int connection_sleep)
4439 {
4440 u16 conn_count = atomic_read(&sess->nconn);
4441 struct iscsi_conn *conn, *conn_tmp = NULL;
4442 int is_last;
4443
4444 spin_lock_bh(&sess->conn_lock);
4445 if (session_sleep)
4446 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4447
4448 if (connection_sleep) {
4449 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4450 conn_list) {
4451 if (conn_count == 0)
4452 break;
4453
4454 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4455 is_last = 1;
4456 } else {
4457 iscsit_inc_conn_usage_count(conn_tmp);
4458 is_last = 0;
4459 }
4460 iscsit_inc_conn_usage_count(conn);
4461
4462 spin_unlock_bh(&sess->conn_lock);
4463 iscsit_cause_connection_reinstatement(conn, 1);
4464 spin_lock_bh(&sess->conn_lock);
4465
4466 iscsit_dec_conn_usage_count(conn);
4467 if (is_last == 0)
4468 iscsit_dec_conn_usage_count(conn_tmp);
4469 conn_count--;
4470 }
4471 } else {
4472 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4473 iscsit_cause_connection_reinstatement(conn, 0);
4474 }
4475
4476 if (session_sleep && atomic_read(&sess->nconn)) {
4477 spin_unlock_bh(&sess->conn_lock);
4478 wait_for_completion(&sess->session_wait_comp);
4479 } else
4480 spin_unlock_bh(&sess->conn_lock);
4481 }
4482
4483 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4484 {
4485 struct iscsi_session *sess;
4486 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4487 struct se_session *se_sess, *se_sess_tmp;
4488 int session_count = 0;
4489
4490 spin_lock_bh(&se_tpg->session_lock);
4491 if (tpg->nsessions && !force) {
4492 spin_unlock_bh(&se_tpg->session_lock);
4493 return -1;
4494 }
4495
4496 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4497 sess_list) {
4498 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4499
4500 spin_lock(&sess->conn_lock);
4501 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4502 atomic_read(&sess->session_logout) ||
4503 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4504 spin_unlock(&sess->conn_lock);
4505 continue;
4506 }
4507 atomic_set(&sess->session_reinstatement, 1);
4508 spin_unlock(&sess->conn_lock);
4509 spin_unlock_bh(&se_tpg->session_lock);
4510
4511 iscsit_free_session(sess);
4512 spin_lock_bh(&se_tpg->session_lock);
4513
4514 session_count++;
4515 }
4516 spin_unlock_bh(&se_tpg->session_lock);
4517
4518 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4519 " Group: %hu\n", session_count, tpg->tpgt);
4520 return 0;
4521 }
4522
4523 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4524 MODULE_VERSION("4.1.x");
4525 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4526 MODULE_LICENSE("GPL");
4527
4528 module_init(iscsi_target_init_module);
4529 module_exit(iscsi_target_cleanup_module);
Linux kernel - Deliverables
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