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iscsi-target: Fix residual count hanlding + remove iscsi_cmd->residual_count
[mirror_ubuntu-artful-kernel.git] / drivers / target / iscsi / iscsi_target.c
1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
5 *
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
7 *
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
20
21 #include <linux/string.h>
22 #include <linux/kthread.h>
23 #include <linux/crypto.h>
24 #include <linux/completion.h>
25 #include <linux/module.h>
26 #include <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 cmd->data_length = cmd->se_cmd.data_length;
1043
1044 if (iscsit_decide_list_to_build(cmd, payload_length) < 0)
1045 return iscsit_add_reject_from_cmd(
1046 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1047 1, 1, buf, cmd);
1048 }
1049
1050 attach_cmd:
1051 spin_lock_bh(&conn->cmd_lock);
1052 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1053 spin_unlock_bh(&conn->cmd_lock);
1054 /*
1055 * Check if we need to delay processing because of ALUA
1056 * Active/NonOptimized primary access state..
1057 */
1058 core_alua_check_nonop_delay(&cmd->se_cmd);
1059 /*
1060 * Allocate and setup SGL used with transport_generic_map_mem_to_cmd().
1061 * also call iscsit_allocate_iovecs()
1062 */
1063 ret = iscsit_alloc_buffs(cmd);
1064 if (ret < 0)
1065 return iscsit_add_reject_from_cmd(
1066 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1067 1, 1, buf, cmd);
1068 /*
1069 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1070 * the Immediate Bit is not set, and no Immediate
1071 * Data is attached.
1072 *
1073 * A PDU/CmdSN carrying Immediate Data can only
1074 * be processed after the DataCRC has passed.
1075 * If the DataCRC fails, the CmdSN MUST NOT
1076 * be acknowledged. (See below)
1077 */
1078 if (!cmd->immediate_data) {
1079 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1080 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1081 return 0;
1082 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1083 return iscsit_add_reject_from_cmd(
1084 ISCSI_REASON_PROTOCOL_ERROR,
1085 1, 0, buf, cmd);
1086 }
1087
1088 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1089
1090 /*
1091 * If no Immediate Data is attached, it's OK to return now.
1092 */
1093 if (!cmd->immediate_data) {
1094 if (send_check_condition)
1095 return 0;
1096
1097 if (cmd->unsolicited_data) {
1098 iscsit_set_dataout_sequence_values(cmd);
1099
1100 spin_lock_bh(&cmd->dataout_timeout_lock);
1101 iscsit_start_dataout_timer(cmd, cmd->conn);
1102 spin_unlock_bh(&cmd->dataout_timeout_lock);
1103 }
1104
1105 return 0;
1106 }
1107
1108 /*
1109 * Early CHECK_CONDITIONs never make it to the transport processing
1110 * thread. They are processed in CmdSN order by
1111 * iscsit_check_received_cmdsn() below.
1112 */
1113 if (send_check_condition) {
1114 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1115 dump_immediate_data = 1;
1116 goto after_immediate_data;
1117 }
1118 /*
1119 * Call directly into transport_generic_new_cmd() to perform
1120 * the backend memory allocation.
1121 */
1122 ret = transport_generic_new_cmd(&cmd->se_cmd);
1123 if (ret < 0) {
1124 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1125 dump_immediate_data = 1;
1126 goto after_immediate_data;
1127 }
1128
1129 immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1130 after_immediate_data:
1131 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1132 /*
1133 * A PDU/CmdSN carrying Immediate Data passed
1134 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1135 * Immediate Bit is not set.
1136 */
1137 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1138 /*
1139 * Special case for Unsupported SAM WRITE Opcodes
1140 * and ImmediateData=Yes.
1141 */
1142 if (dump_immediate_data) {
1143 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1144 return -1;
1145 } else if (cmd->unsolicited_data) {
1146 iscsit_set_dataout_sequence_values(cmd);
1147
1148 spin_lock_bh(&cmd->dataout_timeout_lock);
1149 iscsit_start_dataout_timer(cmd, cmd->conn);
1150 spin_unlock_bh(&cmd->dataout_timeout_lock);
1151 }
1152
1153 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1154 return iscsit_add_reject_from_cmd(
1155 ISCSI_REASON_PROTOCOL_ERROR,
1156 1, 0, buf, cmd);
1157
1158 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1159 /*
1160 * Immediate Data failed DataCRC and ERL>=1,
1161 * silently drop this PDU and let the initiator
1162 * plug the CmdSN gap.
1163 *
1164 * FIXME: Send Unsolicited NOPIN with reserved
1165 * TTT here to help the initiator figure out
1166 * the missing CmdSN, although they should be
1167 * intelligent enough to determine the missing
1168 * CmdSN and issue a retry to plug the sequence.
1169 */
1170 cmd->i_state = ISTATE_REMOVE;
1171 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1172 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1173 return -1;
1174
1175 return 0;
1176 }
1177
1178 static u32 iscsit_do_crypto_hash_sg(
1179 struct hash_desc *hash,
1180 struct iscsi_cmd *cmd,
1181 u32 data_offset,
1182 u32 data_length,
1183 u32 padding,
1184 u8 *pad_bytes)
1185 {
1186 u32 data_crc;
1187 u32 i;
1188 struct scatterlist *sg;
1189 unsigned int page_off;
1190
1191 crypto_hash_init(hash);
1192
1193 sg = cmd->first_data_sg;
1194 page_off = cmd->first_data_sg_off;
1195
1196 i = 0;
1197 while (data_length) {
1198 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1199
1200 crypto_hash_update(hash, &sg[i], cur_len);
1201
1202 data_length -= cur_len;
1203 page_off = 0;
1204 i++;
1205 }
1206
1207 if (padding) {
1208 struct scatterlist pad_sg;
1209
1210 sg_init_one(&pad_sg, pad_bytes, padding);
1211 crypto_hash_update(hash, &pad_sg, padding);
1212 }
1213 crypto_hash_final(hash, (u8 *) &data_crc);
1214
1215 return data_crc;
1216 }
1217
1218 static void iscsit_do_crypto_hash_buf(
1219 struct hash_desc *hash,
1220 unsigned char *buf,
1221 u32 payload_length,
1222 u32 padding,
1223 u8 *pad_bytes,
1224 u8 *data_crc)
1225 {
1226 struct scatterlist sg;
1227
1228 crypto_hash_init(hash);
1229
1230 sg_init_one(&sg, (u8 *)buf, payload_length);
1231 crypto_hash_update(hash, &sg, payload_length);
1232
1233 if (padding) {
1234 sg_init_one(&sg, pad_bytes, padding);
1235 crypto_hash_update(hash, &sg, padding);
1236 }
1237 crypto_hash_final(hash, data_crc);
1238 }
1239
1240 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1241 {
1242 int iov_ret, ooo_cmdsn = 0, ret;
1243 u8 data_crc_failed = 0;
1244 u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1245 u32 rx_size = 0, payload_length;
1246 struct iscsi_cmd *cmd = NULL;
1247 struct se_cmd *se_cmd;
1248 struct iscsi_data *hdr;
1249 struct kvec *iov;
1250 unsigned long flags;
1251
1252 hdr = (struct iscsi_data *) buf;
1253 payload_length = ntoh24(hdr->dlength);
1254 hdr->itt = be32_to_cpu(hdr->itt);
1255 hdr->ttt = be32_to_cpu(hdr->ttt);
1256 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1257 hdr->datasn = be32_to_cpu(hdr->datasn);
1258 hdr->offset = be32_to_cpu(hdr->offset);
1259
1260 if (!payload_length) {
1261 pr_err("DataOUT payload is ZERO, protocol error.\n");
1262 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1263 buf, conn);
1264 }
1265
1266 /* iSCSI write */
1267 spin_lock_bh(&conn->sess->session_stats_lock);
1268 conn->sess->rx_data_octets += payload_length;
1269 if (conn->sess->se_sess->se_node_acl) {
1270 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1271 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1272 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1273 }
1274 spin_unlock_bh(&conn->sess->session_stats_lock);
1275
1276 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1277 pr_err("DataSegmentLength: %u is greater than"
1278 " MaxRecvDataSegmentLength: %u\n", payload_length,
1279 conn->conn_ops->MaxRecvDataSegmentLength);
1280 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1281 buf, conn);
1282 }
1283
1284 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1285 payload_length);
1286 if (!cmd)
1287 return 0;
1288
1289 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1290 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1291 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1292 payload_length, conn->cid);
1293
1294 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1295 pr_err("Command ITT: 0x%08x received DataOUT after"
1296 " last DataOUT received, dumping payload\n",
1297 cmd->init_task_tag);
1298 return iscsit_dump_data_payload(conn, payload_length, 1);
1299 }
1300
1301 if (cmd->data_direction != DMA_TO_DEVICE) {
1302 pr_err("Command ITT: 0x%08x received DataOUT for a"
1303 " NON-WRITE command.\n", cmd->init_task_tag);
1304 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1305 1, 0, buf, cmd);
1306 }
1307 se_cmd = &cmd->se_cmd;
1308 iscsit_mod_dataout_timer(cmd);
1309
1310 if ((hdr->offset + payload_length) > cmd->data_length) {
1311 pr_err("DataOut Offset: %u, Length %u greater than"
1312 " iSCSI Command EDTL %u, protocol error.\n",
1313 hdr->offset, payload_length, cmd->data_length);
1314 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1315 1, 0, buf, cmd);
1316 }
1317
1318 if (cmd->unsolicited_data) {
1319 int dump_unsolicited_data = 0;
1320
1321 if (conn->sess->sess_ops->InitialR2T) {
1322 pr_err("Received unexpected unsolicited data"
1323 " while InitialR2T=Yes, protocol error.\n");
1324 transport_send_check_condition_and_sense(&cmd->se_cmd,
1325 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1326 return -1;
1327 }
1328 /*
1329 * Special case for dealing with Unsolicited DataOUT
1330 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1331 * failures;
1332 */
1333
1334 /* Something's amiss if we're not in WRITE_PENDING state... */
1335 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1336 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1337 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1338
1339 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1340 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1341 (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION))
1342 dump_unsolicited_data = 1;
1343 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1344
1345 if (dump_unsolicited_data) {
1346 /*
1347 * Check if a delayed TASK_ABORTED status needs to
1348 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1349 * received with the unsolicitied data out.
1350 */
1351 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1352 iscsit_stop_dataout_timer(cmd);
1353
1354 transport_check_aborted_status(se_cmd,
1355 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1356 return iscsit_dump_data_payload(conn, payload_length, 1);
1357 }
1358 } else {
1359 /*
1360 * For the normal solicited data path:
1361 *
1362 * Check for a delayed TASK_ABORTED status and dump any
1363 * incoming data out payload if one exists. Also, when the
1364 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1365 * data out sequence, we decrement outstanding_r2ts. Once
1366 * outstanding_r2ts reaches zero, go ahead and send the delayed
1367 * TASK_ABORTED status.
1368 */
1369 if (atomic_read(&se_cmd->t_transport_aborted) != 0) {
1370 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1371 if (--cmd->outstanding_r2ts < 1) {
1372 iscsit_stop_dataout_timer(cmd);
1373 transport_check_aborted_status(
1374 se_cmd, 1);
1375 }
1376
1377 return iscsit_dump_data_payload(conn, payload_length, 1);
1378 }
1379 }
1380 /*
1381 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1382 * within-command recovery checks before receiving the payload.
1383 */
1384 ret = iscsit_check_pre_dataout(cmd, buf);
1385 if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1386 return 0;
1387 else if (ret == DATAOUT_CANNOT_RECOVER)
1388 return -1;
1389
1390 rx_size += payload_length;
1391 iov = &cmd->iov_data[0];
1392
1393 iov_ret = iscsit_map_iovec(cmd, iov, hdr->offset, payload_length);
1394 if (iov_ret < 0)
1395 return -1;
1396
1397 iov_count += iov_ret;
1398
1399 padding = ((-payload_length) & 3);
1400 if (padding != 0) {
1401 iov[iov_count].iov_base = cmd->pad_bytes;
1402 iov[iov_count++].iov_len = padding;
1403 rx_size += padding;
1404 pr_debug("Receiving %u padding bytes.\n", padding);
1405 }
1406
1407 if (conn->conn_ops->DataDigest) {
1408 iov[iov_count].iov_base = &checksum;
1409 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1410 rx_size += ISCSI_CRC_LEN;
1411 }
1412
1413 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1414
1415 iscsit_unmap_iovec(cmd);
1416
1417 if (rx_got != rx_size)
1418 return -1;
1419
1420 if (conn->conn_ops->DataDigest) {
1421 u32 data_crc;
1422
1423 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1424 hdr->offset, payload_length, padding,
1425 cmd->pad_bytes);
1426
1427 if (checksum != data_crc) {
1428 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1429 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1430 " does not match computed 0x%08x\n",
1431 hdr->itt, hdr->offset, payload_length,
1432 hdr->datasn, checksum, data_crc);
1433 data_crc_failed = 1;
1434 } else {
1435 pr_debug("Got CRC32C DataDigest 0x%08x for"
1436 " %u bytes of Data Out\n", checksum,
1437 payload_length);
1438 }
1439 }
1440 /*
1441 * Increment post receive data and CRC values or perform
1442 * within-command recovery.
1443 */
1444 ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1445 if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1446 return 0;
1447 else if (ret == DATAOUT_SEND_R2T) {
1448 iscsit_set_dataout_sequence_values(cmd);
1449 iscsit_build_r2ts_for_cmd(cmd, conn, 0);
1450 } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1451 /*
1452 * Handle extra special case for out of order
1453 * Unsolicited Data Out.
1454 */
1455 spin_lock_bh(&cmd->istate_lock);
1456 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1457 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1458 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1459 spin_unlock_bh(&cmd->istate_lock);
1460
1461 iscsit_stop_dataout_timer(cmd);
1462 return (!ooo_cmdsn) ? transport_generic_handle_data(
1463 &cmd->se_cmd) : 0;
1464 } else /* DATAOUT_CANNOT_RECOVER */
1465 return -1;
1466
1467 return 0;
1468 }
1469
1470 static int iscsit_handle_nop_out(
1471 struct iscsi_conn *conn,
1472 unsigned char *buf)
1473 {
1474 unsigned char *ping_data = NULL;
1475 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1476 u32 checksum, data_crc, padding = 0, payload_length;
1477 u64 lun;
1478 struct iscsi_cmd *cmd = NULL;
1479 struct kvec *iov = NULL;
1480 struct iscsi_nopout *hdr;
1481
1482 hdr = (struct iscsi_nopout *) buf;
1483 payload_length = ntoh24(hdr->dlength);
1484 lun = get_unaligned_le64(&hdr->lun);
1485 hdr->itt = be32_to_cpu(hdr->itt);
1486 hdr->ttt = be32_to_cpu(hdr->ttt);
1487 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1488 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1489
1490 if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1491 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1492 " not set, protocol error.\n");
1493 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1494 buf, conn);
1495 }
1496
1497 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1498 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1499 " greater than MaxRecvDataSegmentLength: %u, protocol"
1500 " error.\n", payload_length,
1501 conn->conn_ops->MaxRecvDataSegmentLength);
1502 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1503 buf, conn);
1504 }
1505
1506 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1507 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1508 (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
1509 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1510 payload_length);
1511 /*
1512 * This is not a response to a Unsolicited NopIN, which means
1513 * it can either be a NOPOUT ping request (with a valid ITT),
1514 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1515 * Either way, make sure we allocate an struct iscsi_cmd, as both
1516 * can contain ping data.
1517 */
1518 if (hdr->ttt == 0xFFFFFFFF) {
1519 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1520 if (!cmd)
1521 return iscsit_add_reject(
1522 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1523 1, buf, conn);
1524
1525 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1526 cmd->i_state = ISTATE_SEND_NOPIN;
1527 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1528 1 : 0);
1529 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1530 cmd->targ_xfer_tag = 0xFFFFFFFF;
1531 cmd->cmd_sn = hdr->cmdsn;
1532 cmd->exp_stat_sn = hdr->exp_statsn;
1533 cmd->data_direction = DMA_NONE;
1534 }
1535
1536 if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
1537 rx_size = payload_length;
1538 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1539 if (!ping_data) {
1540 pr_err("Unable to allocate memory for"
1541 " NOPOUT ping data.\n");
1542 ret = -1;
1543 goto out;
1544 }
1545
1546 iov = &cmd->iov_misc[0];
1547 iov[niov].iov_base = ping_data;
1548 iov[niov++].iov_len = payload_length;
1549
1550 padding = ((-payload_length) & 3);
1551 if (padding != 0) {
1552 pr_debug("Receiving %u additional bytes"
1553 " for padding.\n", padding);
1554 iov[niov].iov_base = &cmd->pad_bytes;
1555 iov[niov++].iov_len = padding;
1556 rx_size += padding;
1557 }
1558 if (conn->conn_ops->DataDigest) {
1559 iov[niov].iov_base = &checksum;
1560 iov[niov++].iov_len = ISCSI_CRC_LEN;
1561 rx_size += ISCSI_CRC_LEN;
1562 }
1563
1564 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1565 if (rx_got != rx_size) {
1566 ret = -1;
1567 goto out;
1568 }
1569
1570 if (conn->conn_ops->DataDigest) {
1571 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1572 ping_data, payload_length,
1573 padding, cmd->pad_bytes,
1574 (u8 *)&data_crc);
1575
1576 if (checksum != data_crc) {
1577 pr_err("Ping data CRC32C DataDigest"
1578 " 0x%08x does not match computed 0x%08x\n",
1579 checksum, data_crc);
1580 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1581 pr_err("Unable to recover from"
1582 " NOPOUT Ping DataCRC failure while in"
1583 " ERL=0.\n");
1584 ret = -1;
1585 goto out;
1586 } else {
1587 /*
1588 * Silently drop this PDU and let the
1589 * initiator plug the CmdSN gap.
1590 */
1591 pr_debug("Dropping NOPOUT"
1592 " Command CmdSN: 0x%08x due to"
1593 " DataCRC error.\n", hdr->cmdsn);
1594 ret = 0;
1595 goto out;
1596 }
1597 } else {
1598 pr_debug("Got CRC32C DataDigest"
1599 " 0x%08x for %u bytes of ping data.\n",
1600 checksum, payload_length);
1601 }
1602 }
1603
1604 ping_data[payload_length] = '\0';
1605 /*
1606 * Attach ping data to struct iscsi_cmd->buf_ptr.
1607 */
1608 cmd->buf_ptr = (void *)ping_data;
1609 cmd->buf_ptr_size = payload_length;
1610
1611 pr_debug("Got %u bytes of NOPOUT ping"
1612 " data.\n", payload_length);
1613 pr_debug("Ping Data: \"%s\"\n", ping_data);
1614 }
1615
1616 if (hdr->itt != 0xFFFFFFFF) {
1617 if (!cmd) {
1618 pr_err("Checking CmdSN for NOPOUT,"
1619 " but cmd is NULL!\n");
1620 return -1;
1621 }
1622 /*
1623 * Initiator is expecting a NopIN ping reply,
1624 */
1625 spin_lock_bh(&conn->cmd_lock);
1626 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1627 spin_unlock_bh(&conn->cmd_lock);
1628
1629 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1630
1631 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1632 iscsit_add_cmd_to_response_queue(cmd, conn,
1633 cmd->i_state);
1634 return 0;
1635 }
1636
1637 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1638 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1639 ret = 0;
1640 goto ping_out;
1641 }
1642 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1643 return iscsit_add_reject_from_cmd(
1644 ISCSI_REASON_PROTOCOL_ERROR,
1645 1, 0, buf, cmd);
1646
1647 return 0;
1648 }
1649
1650 if (hdr->ttt != 0xFFFFFFFF) {
1651 /*
1652 * This was a response to a unsolicited NOPIN ping.
1653 */
1654 cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
1655 if (!cmd)
1656 return -1;
1657
1658 iscsit_stop_nopin_response_timer(conn);
1659
1660 cmd->i_state = ISTATE_REMOVE;
1661 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1662 iscsit_start_nopin_timer(conn);
1663 } else {
1664 /*
1665 * Initiator is not expecting a NOPIN is response.
1666 * Just ignore for now.
1667 *
1668 * iSCSI v19-91 10.18
1669 * "A NOP-OUT may also be used to confirm a changed
1670 * ExpStatSN if another PDU will not be available
1671 * for a long time."
1672 */
1673 ret = 0;
1674 goto out;
1675 }
1676
1677 return 0;
1678 out:
1679 if (cmd)
1680 iscsit_release_cmd(cmd);
1681 ping_out:
1682 kfree(ping_data);
1683 return ret;
1684 }
1685
1686 static int iscsit_handle_task_mgt_cmd(
1687 struct iscsi_conn *conn,
1688 unsigned char *buf)
1689 {
1690 struct iscsi_cmd *cmd;
1691 struct se_tmr_req *se_tmr;
1692 struct iscsi_tmr_req *tmr_req;
1693 struct iscsi_tm *hdr;
1694 u32 payload_length;
1695 int out_of_order_cmdsn = 0;
1696 int ret;
1697 u8 function;
1698
1699 hdr = (struct iscsi_tm *) buf;
1700 payload_length = ntoh24(hdr->dlength);
1701 hdr->itt = be32_to_cpu(hdr->itt);
1702 hdr->rtt = be32_to_cpu(hdr->rtt);
1703 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1704 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1705 hdr->refcmdsn = be32_to_cpu(hdr->refcmdsn);
1706 hdr->exp_datasn = be32_to_cpu(hdr->exp_datasn);
1707 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1708 function = hdr->flags;
1709
1710 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1711 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1712 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1713 hdr->rtt, hdr->refcmdsn, conn->cid);
1714
1715 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1716 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1717 (hdr->rtt != ISCSI_RESERVED_TAG))) {
1718 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1719 hdr->rtt = ISCSI_RESERVED_TAG;
1720 }
1721
1722 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1723 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1724 pr_err("Task Management Request TASK_REASSIGN not"
1725 " issued as immediate command, bad iSCSI Initiator"
1726 "implementation\n");
1727 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1728 buf, conn);
1729 }
1730 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1731 (hdr->refcmdsn != ISCSI_RESERVED_TAG))
1732 hdr->refcmdsn = ISCSI_RESERVED_TAG;
1733
1734 cmd = iscsit_allocate_se_cmd_for_tmr(conn, function);
1735 if (!cmd)
1736 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1737 1, buf, conn);
1738
1739 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1740 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1741 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1742 cmd->init_task_tag = hdr->itt;
1743 cmd->targ_xfer_tag = 0xFFFFFFFF;
1744 cmd->cmd_sn = hdr->cmdsn;
1745 cmd->exp_stat_sn = hdr->exp_statsn;
1746 se_tmr = cmd->se_cmd.se_tmr_req;
1747 tmr_req = cmd->tmr_req;
1748 /*
1749 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1750 */
1751 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1752 ret = iscsit_get_lun_for_tmr(cmd,
1753 get_unaligned_le64(&hdr->lun));
1754 if (ret < 0) {
1755 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1756 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1757 goto attach;
1758 }
1759 }
1760
1761 switch (function) {
1762 case ISCSI_TM_FUNC_ABORT_TASK:
1763 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1764 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1765 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1766 goto attach;
1767 }
1768 break;
1769 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1770 case ISCSI_TM_FUNC_CLEAR_ACA:
1771 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1772 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1773 break;
1774 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1775 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1776 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1777 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1778 goto attach;
1779 }
1780 break;
1781 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1782 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1783 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1784 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1785 goto attach;
1786 }
1787 break;
1788 case ISCSI_TM_FUNC_TASK_REASSIGN:
1789 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1790 /*
1791 * Perform sanity checks on the ExpDataSN only if the
1792 * TASK_REASSIGN was successful.
1793 */
1794 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1795 break;
1796
1797 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1798 return iscsit_add_reject_from_cmd(
1799 ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1800 buf, cmd);
1801 break;
1802 default:
1803 pr_err("Unknown TMR function: 0x%02x, protocol"
1804 " error.\n", function);
1805 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1806 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1807 goto attach;
1808 }
1809
1810 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1811 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1812 se_tmr->call_transport = 1;
1813 attach:
1814 spin_lock_bh(&conn->cmd_lock);
1815 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1816 spin_unlock_bh(&conn->cmd_lock);
1817
1818 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1819 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1820 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1821 out_of_order_cmdsn = 1;
1822 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1823 return 0;
1824 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1825 return iscsit_add_reject_from_cmd(
1826 ISCSI_REASON_PROTOCOL_ERROR,
1827 1, 0, buf, cmd);
1828 }
1829 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1830
1831 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1832 return 0;
1833 /*
1834 * Found the referenced task, send to transport for processing.
1835 */
1836 if (se_tmr->call_transport)
1837 return transport_generic_handle_tmr(&cmd->se_cmd);
1838
1839 /*
1840 * Could not find the referenced LUN, task, or Task Management
1841 * command not authorized or supported. Change state and
1842 * let the tx_thread send the response.
1843 *
1844 * For connection recovery, this is also the default action for
1845 * TMR TASK_REASSIGN.
1846 */
1847 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1848 return 0;
1849 }
1850
1851 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1852 static int iscsit_handle_text_cmd(
1853 struct iscsi_conn *conn,
1854 unsigned char *buf)
1855 {
1856 char *text_ptr, *text_in;
1857 int cmdsn_ret, niov = 0, rx_got, rx_size;
1858 u32 checksum = 0, data_crc = 0, payload_length;
1859 u32 padding = 0, pad_bytes = 0, text_length = 0;
1860 struct iscsi_cmd *cmd;
1861 struct kvec iov[3];
1862 struct iscsi_text *hdr;
1863
1864 hdr = (struct iscsi_text *) buf;
1865 payload_length = ntoh24(hdr->dlength);
1866 hdr->itt = be32_to_cpu(hdr->itt);
1867 hdr->ttt = be32_to_cpu(hdr->ttt);
1868 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1869 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1870
1871 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1872 pr_err("Unable to accept text parameter length: %u"
1873 "greater than MaxRecvDataSegmentLength %u.\n",
1874 payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
1875 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1876 buf, conn);
1877 }
1878
1879 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1880 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1881 hdr->exp_statsn, payload_length);
1882
1883 rx_size = text_length = payload_length;
1884 if (text_length) {
1885 text_in = kzalloc(text_length, GFP_KERNEL);
1886 if (!text_in) {
1887 pr_err("Unable to allocate memory for"
1888 " incoming text parameters\n");
1889 return -1;
1890 }
1891
1892 memset(iov, 0, 3 * sizeof(struct kvec));
1893 iov[niov].iov_base = text_in;
1894 iov[niov++].iov_len = text_length;
1895
1896 padding = ((-payload_length) & 3);
1897 if (padding != 0) {
1898 iov[niov].iov_base = &pad_bytes;
1899 iov[niov++].iov_len = padding;
1900 rx_size += padding;
1901 pr_debug("Receiving %u additional bytes"
1902 " for padding.\n", padding);
1903 }
1904 if (conn->conn_ops->DataDigest) {
1905 iov[niov].iov_base = &checksum;
1906 iov[niov++].iov_len = ISCSI_CRC_LEN;
1907 rx_size += ISCSI_CRC_LEN;
1908 }
1909
1910 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1911 if (rx_got != rx_size) {
1912 kfree(text_in);
1913 return -1;
1914 }
1915
1916 if (conn->conn_ops->DataDigest) {
1917 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1918 text_in, text_length,
1919 padding, (u8 *)&pad_bytes,
1920 (u8 *)&data_crc);
1921
1922 if (checksum != data_crc) {
1923 pr_err("Text data CRC32C DataDigest"
1924 " 0x%08x does not match computed"
1925 " 0x%08x\n", checksum, data_crc);
1926 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1927 pr_err("Unable to recover from"
1928 " Text Data digest failure while in"
1929 " ERL=0.\n");
1930 kfree(text_in);
1931 return -1;
1932 } else {
1933 /*
1934 * Silently drop this PDU and let the
1935 * initiator plug the CmdSN gap.
1936 */
1937 pr_debug("Dropping Text"
1938 " Command CmdSN: 0x%08x due to"
1939 " DataCRC error.\n", hdr->cmdsn);
1940 kfree(text_in);
1941 return 0;
1942 }
1943 } else {
1944 pr_debug("Got CRC32C DataDigest"
1945 " 0x%08x for %u bytes of text data.\n",
1946 checksum, text_length);
1947 }
1948 }
1949 text_in[text_length - 1] = '\0';
1950 pr_debug("Successfully read %d bytes of text"
1951 " data.\n", text_length);
1952
1953 if (strncmp("SendTargets", text_in, 11) != 0) {
1954 pr_err("Received Text Data that is not"
1955 " SendTargets, cannot continue.\n");
1956 kfree(text_in);
1957 return -1;
1958 }
1959 text_ptr = strchr(text_in, '=');
1960 if (!text_ptr) {
1961 pr_err("No \"=\" separator found in Text Data,"
1962 " cannot continue.\n");
1963 kfree(text_in);
1964 return -1;
1965 }
1966 if (strncmp("=All", text_ptr, 4) != 0) {
1967 pr_err("Unable to locate All value for"
1968 " SendTargets key, cannot continue.\n");
1969 kfree(text_in);
1970 return -1;
1971 }
1972 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1973 kfree(text_in);
1974 }
1975
1976 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1977 if (!cmd)
1978 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1979 1, buf, conn);
1980
1981 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1982 cmd->i_state = ISTATE_SEND_TEXTRSP;
1983 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1984 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1985 cmd->targ_xfer_tag = 0xFFFFFFFF;
1986 cmd->cmd_sn = hdr->cmdsn;
1987 cmd->exp_stat_sn = hdr->exp_statsn;
1988 cmd->data_direction = DMA_NONE;
1989
1990 spin_lock_bh(&conn->cmd_lock);
1991 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1992 spin_unlock_bh(&conn->cmd_lock);
1993
1994 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1995
1996 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1997 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1998 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1999 return iscsit_add_reject_from_cmd(
2000 ISCSI_REASON_PROTOCOL_ERROR,
2001 1, 0, buf, cmd);
2002
2003 return 0;
2004 }
2005
2006 return iscsit_execute_cmd(cmd, 0);
2007 }
2008
2009 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2010 {
2011 struct iscsi_conn *conn_p;
2012 struct iscsi_session *sess = conn->sess;
2013
2014 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2015 " for SID: %u.\n", conn->cid, conn->sess->sid);
2016
2017 atomic_set(&sess->session_logout, 1);
2018 atomic_set(&conn->conn_logout_remove, 1);
2019 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2020
2021 iscsit_inc_conn_usage_count(conn);
2022 iscsit_inc_session_usage_count(sess);
2023
2024 spin_lock_bh(&sess->conn_lock);
2025 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2026 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2027 continue;
2028
2029 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2030 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2031 }
2032 spin_unlock_bh(&sess->conn_lock);
2033
2034 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2035
2036 return 0;
2037 }
2038
2039 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2040 {
2041 struct iscsi_conn *l_conn;
2042 struct iscsi_session *sess = conn->sess;
2043
2044 pr_debug("Received logout request CLOSECONNECTION for CID:"
2045 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2046
2047 /*
2048 * A Logout Request with a CLOSECONNECTION reason code for a CID
2049 * can arrive on a connection with a differing CID.
2050 */
2051 if (conn->cid == cmd->logout_cid) {
2052 spin_lock_bh(&conn->state_lock);
2053 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2054 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2055
2056 atomic_set(&conn->conn_logout_remove, 1);
2057 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2058 iscsit_inc_conn_usage_count(conn);
2059
2060 spin_unlock_bh(&conn->state_lock);
2061 } else {
2062 /*
2063 * Handle all different cid CLOSECONNECTION requests in
2064 * iscsit_logout_post_handler_diffcid() as to give enough
2065 * time for any non immediate command's CmdSN to be
2066 * acknowledged on the connection in question.
2067 *
2068 * Here we simply make sure the CID is still around.
2069 */
2070 l_conn = iscsit_get_conn_from_cid(sess,
2071 cmd->logout_cid);
2072 if (!l_conn) {
2073 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2074 iscsit_add_cmd_to_response_queue(cmd, conn,
2075 cmd->i_state);
2076 return 0;
2077 }
2078
2079 iscsit_dec_conn_usage_count(l_conn);
2080 }
2081
2082 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2083
2084 return 0;
2085 }
2086
2087 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2088 {
2089 struct iscsi_session *sess = conn->sess;
2090
2091 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2092 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2093
2094 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2095 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2096 " while ERL!=2.\n");
2097 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2098 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2099 return 0;
2100 }
2101
2102 if (conn->cid == cmd->logout_cid) {
2103 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2104 " with CID: %hu on CID: %hu, implementation error.\n",
2105 cmd->logout_cid, conn->cid);
2106 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2107 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2108 return 0;
2109 }
2110
2111 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2112
2113 return 0;
2114 }
2115
2116 static int iscsit_handle_logout_cmd(
2117 struct iscsi_conn *conn,
2118 unsigned char *buf)
2119 {
2120 int cmdsn_ret, logout_remove = 0;
2121 u8 reason_code = 0;
2122 struct iscsi_cmd *cmd;
2123 struct iscsi_logout *hdr;
2124 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2125
2126 hdr = (struct iscsi_logout *) buf;
2127 reason_code = (hdr->flags & 0x7f);
2128 hdr->itt = be32_to_cpu(hdr->itt);
2129 hdr->cid = be16_to_cpu(hdr->cid);
2130 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
2131 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2132
2133 if (tiqn) {
2134 spin_lock(&tiqn->logout_stats.lock);
2135 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2136 tiqn->logout_stats.normal_logouts++;
2137 else
2138 tiqn->logout_stats.abnormal_logouts++;
2139 spin_unlock(&tiqn->logout_stats.lock);
2140 }
2141
2142 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2143 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2144 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2145 hdr->cid, conn->cid);
2146
2147 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2148 pr_err("Received logout request on connection that"
2149 " is not in logged in state, ignoring request.\n");
2150 return 0;
2151 }
2152
2153 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2154 if (!cmd)
2155 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2156 buf, conn);
2157
2158 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2159 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2160 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2161 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2162 cmd->targ_xfer_tag = 0xFFFFFFFF;
2163 cmd->cmd_sn = hdr->cmdsn;
2164 cmd->exp_stat_sn = hdr->exp_statsn;
2165 cmd->logout_cid = hdr->cid;
2166 cmd->logout_reason = reason_code;
2167 cmd->data_direction = DMA_NONE;
2168
2169 /*
2170 * We need to sleep in these cases (by returning 1) until the Logout
2171 * Response gets sent in the tx thread.
2172 */
2173 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2174 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2175 (hdr->cid == conn->cid)))
2176 logout_remove = 1;
2177
2178 spin_lock_bh(&conn->cmd_lock);
2179 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
2180 spin_unlock_bh(&conn->cmd_lock);
2181
2182 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2183 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2184
2185 /*
2186 * Immediate commands are executed, well, immediately.
2187 * Non-Immediate Logout Commands are executed in CmdSN order.
2188 */
2189 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
2190 int ret = iscsit_execute_cmd(cmd, 0);
2191
2192 if (ret < 0)
2193 return ret;
2194 } else {
2195 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2196 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2197 logout_remove = 0;
2198 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2199 return iscsit_add_reject_from_cmd(
2200 ISCSI_REASON_PROTOCOL_ERROR,
2201 1, 0, buf, cmd);
2202 }
2203 }
2204
2205 return logout_remove;
2206 }
2207
2208 static int iscsit_handle_snack(
2209 struct iscsi_conn *conn,
2210 unsigned char *buf)
2211 {
2212 u32 unpacked_lun;
2213 u64 lun;
2214 struct iscsi_snack *hdr;
2215
2216 hdr = (struct iscsi_snack *) buf;
2217 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2218 lun = get_unaligned_le64(&hdr->lun);
2219 unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
2220 hdr->itt = be32_to_cpu(hdr->itt);
2221 hdr->ttt = be32_to_cpu(hdr->ttt);
2222 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2223 hdr->begrun = be32_to_cpu(hdr->begrun);
2224 hdr->runlength = be32_to_cpu(hdr->runlength);
2225
2226 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2227 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2228 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2229 hdr->begrun, hdr->runlength, conn->cid);
2230
2231 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2232 pr_err("Initiator sent SNACK request while in"
2233 " ErrorRecoveryLevel=0.\n");
2234 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2235 buf, conn);
2236 }
2237 /*
2238 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2239 * call from inside iscsi_send_recovery_datain_or_r2t().
2240 */
2241 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2242 case 0:
2243 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2244 hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
2245 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2246 return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
2247 hdr->begrun, hdr->runlength);
2248 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2249 return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
2250 hdr->runlength);
2251 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2252 /* FIXME: Support R-Data SNACK */
2253 pr_err("R-Data SNACK Not Supported.\n");
2254 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2255 buf, conn);
2256 default:
2257 pr_err("Unknown SNACK type 0x%02x, protocol"
2258 " error.\n", hdr->flags & 0x0f);
2259 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2260 buf, conn);
2261 }
2262
2263 return 0;
2264 }
2265
2266 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2267 {
2268 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2269 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2270 wait_for_completion_interruptible_timeout(
2271 &conn->rx_half_close_comp,
2272 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2273 }
2274 }
2275
2276 static int iscsit_handle_immediate_data(
2277 struct iscsi_cmd *cmd,
2278 unsigned char *buf,
2279 u32 length)
2280 {
2281 int iov_ret, rx_got = 0, rx_size = 0;
2282 u32 checksum, iov_count = 0, padding = 0;
2283 struct iscsi_conn *conn = cmd->conn;
2284 struct kvec *iov;
2285
2286 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2287 if (iov_ret < 0)
2288 return IMMEDIATE_DATA_CANNOT_RECOVER;
2289
2290 rx_size = length;
2291 iov_count = iov_ret;
2292 iov = &cmd->iov_data[0];
2293
2294 padding = ((-length) & 3);
2295 if (padding != 0) {
2296 iov[iov_count].iov_base = cmd->pad_bytes;
2297 iov[iov_count++].iov_len = padding;
2298 rx_size += padding;
2299 }
2300
2301 if (conn->conn_ops->DataDigest) {
2302 iov[iov_count].iov_base = &checksum;
2303 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2304 rx_size += ISCSI_CRC_LEN;
2305 }
2306
2307 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2308
2309 iscsit_unmap_iovec(cmd);
2310
2311 if (rx_got != rx_size) {
2312 iscsit_rx_thread_wait_for_tcp(conn);
2313 return IMMEDIATE_DATA_CANNOT_RECOVER;
2314 }
2315
2316 if (conn->conn_ops->DataDigest) {
2317 u32 data_crc;
2318
2319 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2320 cmd->write_data_done, length, padding,
2321 cmd->pad_bytes);
2322
2323 if (checksum != data_crc) {
2324 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2325 " does not match computed 0x%08x\n", checksum,
2326 data_crc);
2327
2328 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2329 pr_err("Unable to recover from"
2330 " Immediate Data digest failure while"
2331 " in ERL=0.\n");
2332 iscsit_add_reject_from_cmd(
2333 ISCSI_REASON_DATA_DIGEST_ERROR,
2334 1, 0, buf, cmd);
2335 return IMMEDIATE_DATA_CANNOT_RECOVER;
2336 } else {
2337 iscsit_add_reject_from_cmd(
2338 ISCSI_REASON_DATA_DIGEST_ERROR,
2339 0, 0, buf, cmd);
2340 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2341 }
2342 } else {
2343 pr_debug("Got CRC32C DataDigest 0x%08x for"
2344 " %u bytes of Immediate Data\n", checksum,
2345 length);
2346 }
2347 }
2348
2349 cmd->write_data_done += length;
2350
2351 if (cmd->write_data_done == cmd->data_length) {
2352 spin_lock_bh(&cmd->istate_lock);
2353 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2354 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2355 spin_unlock_bh(&cmd->istate_lock);
2356 }
2357
2358 return IMMEDIATE_DATA_NORMAL_OPERATION;
2359 }
2360
2361 /*
2362 * Called with sess->conn_lock held.
2363 */
2364 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2365 with active network interface */
2366 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2367 {
2368 struct iscsi_cmd *cmd;
2369 struct iscsi_conn *conn_p;
2370
2371 /*
2372 * Only send a Asynchronous Message on connections whos network
2373 * interface is still functional.
2374 */
2375 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2376 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2377 iscsit_inc_conn_usage_count(conn_p);
2378 break;
2379 }
2380 }
2381
2382 if (!conn_p)
2383 return;
2384
2385 cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
2386 if (!cmd) {
2387 iscsit_dec_conn_usage_count(conn_p);
2388 return;
2389 }
2390
2391 cmd->logout_cid = conn->cid;
2392 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2393 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2394
2395 spin_lock_bh(&conn_p->cmd_lock);
2396 list_add_tail(&cmd->i_list, &conn_p->conn_cmd_list);
2397 spin_unlock_bh(&conn_p->cmd_lock);
2398
2399 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2400 iscsit_dec_conn_usage_count(conn_p);
2401 }
2402
2403 static int iscsit_send_conn_drop_async_message(
2404 struct iscsi_cmd *cmd,
2405 struct iscsi_conn *conn)
2406 {
2407 struct iscsi_async *hdr;
2408
2409 cmd->tx_size = ISCSI_HDR_LEN;
2410 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2411
2412 hdr = (struct iscsi_async *) cmd->pdu;
2413 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2414 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2415 cmd->init_task_tag = 0xFFFFFFFF;
2416 cmd->targ_xfer_tag = 0xFFFFFFFF;
2417 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2418 cmd->stat_sn = conn->stat_sn++;
2419 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2420 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2421 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2422 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2423 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2424 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2425 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2426
2427 if (conn->conn_ops->HeaderDigest) {
2428 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2429
2430 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2431 (unsigned char *)hdr, ISCSI_HDR_LEN,
2432 0, NULL, (u8 *)header_digest);
2433
2434 cmd->tx_size += ISCSI_CRC_LEN;
2435 pr_debug("Attaching CRC32C HeaderDigest to"
2436 " Async Message 0x%08x\n", *header_digest);
2437 }
2438
2439 cmd->iov_misc[0].iov_base = cmd->pdu;
2440 cmd->iov_misc[0].iov_len = cmd->tx_size;
2441 cmd->iov_misc_count = 1;
2442
2443 pr_debug("Sending Connection Dropped Async Message StatSN:"
2444 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2445 cmd->logout_cid, conn->cid);
2446 return 0;
2447 }
2448
2449 static int iscsit_send_data_in(
2450 struct iscsi_cmd *cmd,
2451 struct iscsi_conn *conn,
2452 int *eodr)
2453 {
2454 int iov_ret = 0, set_statsn = 0;
2455 u32 iov_count = 0, tx_size = 0;
2456 struct iscsi_datain datain;
2457 struct iscsi_datain_req *dr;
2458 struct iscsi_data_rsp *hdr;
2459 struct kvec *iov;
2460
2461 memset(&datain, 0, sizeof(struct iscsi_datain));
2462 dr = iscsit_get_datain_values(cmd, &datain);
2463 if (!dr) {
2464 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2465 cmd->init_task_tag);
2466 return -1;
2467 }
2468
2469 /*
2470 * Be paranoid and double check the logic for now.
2471 */
2472 if ((datain.offset + datain.length) > cmd->data_length) {
2473 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2474 " datain.length: %u exceeds cmd->data_length: %u\n",
2475 cmd->init_task_tag, datain.offset, datain.length,
2476 cmd->data_length);
2477 return -1;
2478 }
2479
2480 spin_lock_bh(&conn->sess->session_stats_lock);
2481 conn->sess->tx_data_octets += datain.length;
2482 if (conn->sess->se_sess->se_node_acl) {
2483 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2484 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2485 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2486 }
2487 spin_unlock_bh(&conn->sess->session_stats_lock);
2488 /*
2489 * Special case for successfully execution w/ both DATAIN
2490 * and Sense Data.
2491 */
2492 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2493 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2494 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2495 else {
2496 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2497 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2498 iscsit_increment_maxcmdsn(cmd, conn->sess);
2499 cmd->stat_sn = conn->stat_sn++;
2500 set_statsn = 1;
2501 } else if (dr->dr_complete ==
2502 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2503 set_statsn = 1;
2504 }
2505
2506 hdr = (struct iscsi_data_rsp *) cmd->pdu;
2507 memset(hdr, 0, ISCSI_HDR_LEN);
2508 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2509 hdr->flags = datain.flags;
2510 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2511 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2512 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2513 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2514 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2515 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2516 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2517 }
2518 }
2519 hton24(hdr->dlength, datain.length);
2520 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2521 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2522 (struct scsi_lun *)&hdr->lun);
2523 else
2524 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2525
2526 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2527 hdr->ttt = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
2528 cpu_to_be32(cmd->targ_xfer_tag) :
2529 0xFFFFFFFF;
2530 hdr->statsn = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
2531 0xFFFFFFFF;
2532 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2533 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2534 hdr->datasn = cpu_to_be32(datain.data_sn);
2535 hdr->offset = cpu_to_be32(datain.offset);
2536
2537 iov = &cmd->iov_data[0];
2538 iov[iov_count].iov_base = cmd->pdu;
2539 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2540 tx_size += ISCSI_HDR_LEN;
2541
2542 if (conn->conn_ops->HeaderDigest) {
2543 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2544
2545 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2546 (unsigned char *)hdr, ISCSI_HDR_LEN,
2547 0, NULL, (u8 *)header_digest);
2548
2549 iov[0].iov_len += ISCSI_CRC_LEN;
2550 tx_size += ISCSI_CRC_LEN;
2551
2552 pr_debug("Attaching CRC32 HeaderDigest"
2553 " for DataIN PDU 0x%08x\n", *header_digest);
2554 }
2555
2556 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2557 if (iov_ret < 0)
2558 return -1;
2559
2560 iov_count += iov_ret;
2561 tx_size += datain.length;
2562
2563 cmd->padding = ((-datain.length) & 3);
2564 if (cmd->padding) {
2565 iov[iov_count].iov_base = cmd->pad_bytes;
2566 iov[iov_count++].iov_len = cmd->padding;
2567 tx_size += cmd->padding;
2568
2569 pr_debug("Attaching %u padding bytes\n",
2570 cmd->padding);
2571 }
2572 if (conn->conn_ops->DataDigest) {
2573 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2574 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2575
2576 iov[iov_count].iov_base = &cmd->data_crc;
2577 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2578 tx_size += ISCSI_CRC_LEN;
2579
2580 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2581 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2582 }
2583
2584 cmd->iov_data_count = iov_count;
2585 cmd->tx_size = tx_size;
2586
2587 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2588 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2589 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2590 ntohl(hdr->offset), datain.length, conn->cid);
2591
2592 if (dr->dr_complete) {
2593 *eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2594 2 : 1;
2595 iscsit_free_datain_req(cmd, dr);
2596 }
2597
2598 return 0;
2599 }
2600
2601 static int iscsit_send_logout_response(
2602 struct iscsi_cmd *cmd,
2603 struct iscsi_conn *conn)
2604 {
2605 int niov = 0, tx_size;
2606 struct iscsi_conn *logout_conn = NULL;
2607 struct iscsi_conn_recovery *cr = NULL;
2608 struct iscsi_session *sess = conn->sess;
2609 struct kvec *iov;
2610 struct iscsi_logout_rsp *hdr;
2611 /*
2612 * The actual shutting down of Sessions and/or Connections
2613 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2614 * is done in scsi_logout_post_handler().
2615 */
2616 switch (cmd->logout_reason) {
2617 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2618 pr_debug("iSCSI session logout successful, setting"
2619 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2620 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2621 break;
2622 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2623 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2624 break;
2625 /*
2626 * For CLOSECONNECTION logout requests carrying
2627 * a matching logout CID -> local CID, the reference
2628 * for the local CID will have been incremented in
2629 * iscsi_logout_closeconnection().
2630 *
2631 * For CLOSECONNECTION logout requests carrying
2632 * a different CID than the connection it arrived
2633 * on, the connection responding to cmd->logout_cid
2634 * is stopped in iscsit_logout_post_handler_diffcid().
2635 */
2636
2637 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2638 " successful.\n", cmd->logout_cid, conn->cid);
2639 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2640 break;
2641 case ISCSI_LOGOUT_REASON_RECOVERY:
2642 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2643 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2644 break;
2645 /*
2646 * If the connection is still active from our point of view
2647 * force connection recovery to occur.
2648 */
2649 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2650 cmd->logout_cid);
2651 if ((logout_conn)) {
2652 iscsit_connection_reinstatement_rcfr(logout_conn);
2653 iscsit_dec_conn_usage_count(logout_conn);
2654 }
2655
2656 cr = iscsit_get_inactive_connection_recovery_entry(
2657 conn->sess, cmd->logout_cid);
2658 if (!cr) {
2659 pr_err("Unable to locate CID: %hu for"
2660 " REMOVECONNFORRECOVERY Logout Request.\n",
2661 cmd->logout_cid);
2662 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2663 break;
2664 }
2665
2666 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2667
2668 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2669 " for recovery for CID: %hu on CID: %hu successful.\n",
2670 cmd->logout_cid, conn->cid);
2671 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2672 break;
2673 default:
2674 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2675 cmd->logout_reason);
2676 return -1;
2677 }
2678
2679 tx_size = ISCSI_HDR_LEN;
2680 hdr = (struct iscsi_logout_rsp *)cmd->pdu;
2681 memset(hdr, 0, ISCSI_HDR_LEN);
2682 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2683 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2684 hdr->response = cmd->logout_response;
2685 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2686 cmd->stat_sn = conn->stat_sn++;
2687 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2688
2689 iscsit_increment_maxcmdsn(cmd, conn->sess);
2690 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2691 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2692
2693 iov = &cmd->iov_misc[0];
2694 iov[niov].iov_base = cmd->pdu;
2695 iov[niov++].iov_len = ISCSI_HDR_LEN;
2696
2697 if (conn->conn_ops->HeaderDigest) {
2698 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2699
2700 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2701 (unsigned char *)hdr, ISCSI_HDR_LEN,
2702 0, NULL, (u8 *)header_digest);
2703
2704 iov[0].iov_len += ISCSI_CRC_LEN;
2705 tx_size += ISCSI_CRC_LEN;
2706 pr_debug("Attaching CRC32C HeaderDigest to"
2707 " Logout Response 0x%08x\n", *header_digest);
2708 }
2709 cmd->iov_misc_count = niov;
2710 cmd->tx_size = tx_size;
2711
2712 pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2713 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2714 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2715 cmd->logout_cid, conn->cid);
2716
2717 return 0;
2718 }
2719
2720 /*
2721 * Unsolicited NOPIN, either requesting a response or not.
2722 */
2723 static int iscsit_send_unsolicited_nopin(
2724 struct iscsi_cmd *cmd,
2725 struct iscsi_conn *conn,
2726 int want_response)
2727 {
2728 int tx_size = ISCSI_HDR_LEN;
2729 struct iscsi_nopin *hdr;
2730
2731 hdr = (struct iscsi_nopin *) cmd->pdu;
2732 memset(hdr, 0, ISCSI_HDR_LEN);
2733 hdr->opcode = ISCSI_OP_NOOP_IN;
2734 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2735 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2736 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2737 cmd->stat_sn = conn->stat_sn;
2738 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2739 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2740 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2741
2742 if (conn->conn_ops->HeaderDigest) {
2743 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2744
2745 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2746 (unsigned char *)hdr, ISCSI_HDR_LEN,
2747 0, NULL, (u8 *)header_digest);
2748
2749 tx_size += ISCSI_CRC_LEN;
2750 pr_debug("Attaching CRC32C HeaderDigest to"
2751 " NopIN 0x%08x\n", *header_digest);
2752 }
2753
2754 cmd->iov_misc[0].iov_base = cmd->pdu;
2755 cmd->iov_misc[0].iov_len = tx_size;
2756 cmd->iov_misc_count = 1;
2757 cmd->tx_size = tx_size;
2758
2759 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2760 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2761
2762 return 0;
2763 }
2764
2765 static int iscsit_send_nopin_response(
2766 struct iscsi_cmd *cmd,
2767 struct iscsi_conn *conn)
2768 {
2769 int niov = 0, tx_size;
2770 u32 padding = 0;
2771 struct kvec *iov;
2772 struct iscsi_nopin *hdr;
2773
2774 tx_size = ISCSI_HDR_LEN;
2775 hdr = (struct iscsi_nopin *) cmd->pdu;
2776 memset(hdr, 0, ISCSI_HDR_LEN);
2777 hdr->opcode = ISCSI_OP_NOOP_IN;
2778 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2779 hton24(hdr->dlength, cmd->buf_ptr_size);
2780 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2781 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2782 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2783 cmd->stat_sn = conn->stat_sn++;
2784 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2785
2786 iscsit_increment_maxcmdsn(cmd, conn->sess);
2787 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2788 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2789
2790 iov = &cmd->iov_misc[0];
2791 iov[niov].iov_base = cmd->pdu;
2792 iov[niov++].iov_len = ISCSI_HDR_LEN;
2793
2794 if (conn->conn_ops->HeaderDigest) {
2795 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2796
2797 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2798 (unsigned char *)hdr, ISCSI_HDR_LEN,
2799 0, NULL, (u8 *)header_digest);
2800
2801 iov[0].iov_len += ISCSI_CRC_LEN;
2802 tx_size += ISCSI_CRC_LEN;
2803 pr_debug("Attaching CRC32C HeaderDigest"
2804 " to NopIn 0x%08x\n", *header_digest);
2805 }
2806
2807 /*
2808 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2809 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2810 */
2811 if (cmd->buf_ptr_size) {
2812 iov[niov].iov_base = cmd->buf_ptr;
2813 iov[niov++].iov_len = cmd->buf_ptr_size;
2814 tx_size += cmd->buf_ptr_size;
2815
2816 pr_debug("Echoing back %u bytes of ping"
2817 " data.\n", cmd->buf_ptr_size);
2818
2819 padding = ((-cmd->buf_ptr_size) & 3);
2820 if (padding != 0) {
2821 iov[niov].iov_base = &cmd->pad_bytes;
2822 iov[niov++].iov_len = padding;
2823 tx_size += padding;
2824 pr_debug("Attaching %u additional"
2825 " padding bytes.\n", padding);
2826 }
2827 if (conn->conn_ops->DataDigest) {
2828 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2829 cmd->buf_ptr, cmd->buf_ptr_size,
2830 padding, (u8 *)&cmd->pad_bytes,
2831 (u8 *)&cmd->data_crc);
2832
2833 iov[niov].iov_base = &cmd->data_crc;
2834 iov[niov++].iov_len = ISCSI_CRC_LEN;
2835 tx_size += ISCSI_CRC_LEN;
2836 pr_debug("Attached DataDigest for %u"
2837 " bytes of ping data, CRC 0x%08x\n",
2838 cmd->buf_ptr_size, cmd->data_crc);
2839 }
2840 }
2841
2842 cmd->iov_misc_count = niov;
2843 cmd->tx_size = tx_size;
2844
2845 pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2846 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2847 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2848
2849 return 0;
2850 }
2851
2852 int iscsit_send_r2t(
2853 struct iscsi_cmd *cmd,
2854 struct iscsi_conn *conn)
2855 {
2856 int tx_size = 0;
2857 struct iscsi_r2t *r2t;
2858 struct iscsi_r2t_rsp *hdr;
2859
2860 r2t = iscsit_get_r2t_from_list(cmd);
2861 if (!r2t)
2862 return -1;
2863
2864 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
2865 memset(hdr, 0, ISCSI_HDR_LEN);
2866 hdr->opcode = ISCSI_OP_R2T;
2867 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2868 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2869 (struct scsi_lun *)&hdr->lun);
2870 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2871 spin_lock_bh(&conn->sess->ttt_lock);
2872 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2873 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2874 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2875 spin_unlock_bh(&conn->sess->ttt_lock);
2876 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
2877 hdr->statsn = cpu_to_be32(conn->stat_sn);
2878 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2879 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2880 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
2881 hdr->data_offset = cpu_to_be32(r2t->offset);
2882 hdr->data_length = cpu_to_be32(r2t->xfer_len);
2883
2884 cmd->iov_misc[0].iov_base = cmd->pdu;
2885 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
2886 tx_size += ISCSI_HDR_LEN;
2887
2888 if (conn->conn_ops->HeaderDigest) {
2889 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2890
2891 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2892 (unsigned char *)hdr, ISCSI_HDR_LEN,
2893 0, NULL, (u8 *)header_digest);
2894
2895 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2896 tx_size += ISCSI_CRC_LEN;
2897 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2898 " PDU 0x%08x\n", *header_digest);
2899 }
2900
2901 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2902 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2903 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2904 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2905 r2t->offset, r2t->xfer_len, conn->cid);
2906
2907 cmd->iov_misc_count = 1;
2908 cmd->tx_size = tx_size;
2909
2910 spin_lock_bh(&cmd->r2t_lock);
2911 r2t->sent_r2t = 1;
2912 spin_unlock_bh(&cmd->r2t_lock);
2913
2914 return 0;
2915 }
2916
2917 /*
2918 * type 0: Normal Operation.
2919 * type 1: Called from Storage Transport.
2920 * type 2: Called from iscsi_task_reassign_complete_write() for
2921 * connection recovery.
2922 */
2923 int iscsit_build_r2ts_for_cmd(
2924 struct iscsi_cmd *cmd,
2925 struct iscsi_conn *conn,
2926 int type)
2927 {
2928 int first_r2t = 1;
2929 u32 offset = 0, xfer_len = 0;
2930
2931 spin_lock_bh(&cmd->r2t_lock);
2932 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2933 spin_unlock_bh(&cmd->r2t_lock);
2934 return 0;
2935 }
2936
2937 if (conn->sess->sess_ops->DataSequenceInOrder && (type != 2))
2938 if (cmd->r2t_offset < cmd->write_data_done)
2939 cmd->r2t_offset = cmd->write_data_done;
2940
2941 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2942 if (conn->sess->sess_ops->DataSequenceInOrder) {
2943 offset = cmd->r2t_offset;
2944
2945 if (first_r2t && (type == 2)) {
2946 xfer_len = ((offset +
2947 (conn->sess->sess_ops->MaxBurstLength -
2948 cmd->next_burst_len) >
2949 cmd->data_length) ?
2950 (cmd->data_length - offset) :
2951 (conn->sess->sess_ops->MaxBurstLength -
2952 cmd->next_burst_len));
2953 } else {
2954 xfer_len = ((offset +
2955 conn->sess->sess_ops->MaxBurstLength) >
2956 cmd->data_length) ?
2957 (cmd->data_length - offset) :
2958 conn->sess->sess_ops->MaxBurstLength;
2959 }
2960 cmd->r2t_offset += xfer_len;
2961
2962 if (cmd->r2t_offset == cmd->data_length)
2963 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2964 } else {
2965 struct iscsi_seq *seq;
2966
2967 seq = iscsit_get_seq_holder_for_r2t(cmd);
2968 if (!seq) {
2969 spin_unlock_bh(&cmd->r2t_lock);
2970 return -1;
2971 }
2972
2973 offset = seq->offset;
2974 xfer_len = seq->xfer_len;
2975
2976 if (cmd->seq_send_order == cmd->seq_count)
2977 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2978 }
2979 cmd->outstanding_r2ts++;
2980 first_r2t = 0;
2981
2982 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
2983 spin_unlock_bh(&cmd->r2t_lock);
2984 return -1;
2985 }
2986
2987 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
2988 break;
2989 }
2990 spin_unlock_bh(&cmd->r2t_lock);
2991
2992 return 0;
2993 }
2994
2995 static int iscsit_send_status(
2996 struct iscsi_cmd *cmd,
2997 struct iscsi_conn *conn)
2998 {
2999 u8 iov_count = 0, recovery;
3000 u32 padding = 0, tx_size = 0;
3001 struct iscsi_scsi_rsp *hdr;
3002 struct kvec *iov;
3003
3004 recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3005 if (!recovery)
3006 cmd->stat_sn = conn->stat_sn++;
3007
3008 spin_lock_bh(&conn->sess->session_stats_lock);
3009 conn->sess->rsp_pdus++;
3010 spin_unlock_bh(&conn->sess->session_stats_lock);
3011
3012 hdr = (struct iscsi_scsi_rsp *) cmd->pdu;
3013 memset(hdr, 0, ISCSI_HDR_LEN);
3014 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3015 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3016 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3017 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3018 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3019 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3020 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3021 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3022 }
3023 hdr->response = cmd->iscsi_response;
3024 hdr->cmd_status = cmd->se_cmd.scsi_status;
3025 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3026 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3027
3028 iscsit_increment_maxcmdsn(cmd, conn->sess);
3029 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3030 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3031
3032 iov = &cmd->iov_misc[0];
3033 iov[iov_count].iov_base = cmd->pdu;
3034 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3035 tx_size += ISCSI_HDR_LEN;
3036
3037 /*
3038 * Attach SENSE DATA payload to iSCSI Response PDU
3039 */
3040 if (cmd->se_cmd.sense_buffer &&
3041 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3042 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3043 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3044 hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
3045 iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
3046 iov[iov_count++].iov_len =
3047 (cmd->se_cmd.scsi_sense_length + padding);
3048 tx_size += cmd->se_cmd.scsi_sense_length;
3049
3050 if (padding) {
3051 memset(cmd->se_cmd.sense_buffer +
3052 cmd->se_cmd.scsi_sense_length, 0, padding);
3053 tx_size += padding;
3054 pr_debug("Adding %u bytes of padding to"
3055 " SENSE.\n", padding);
3056 }
3057
3058 if (conn->conn_ops->DataDigest) {
3059 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3060 cmd->se_cmd.sense_buffer,
3061 (cmd->se_cmd.scsi_sense_length + padding),
3062 0, NULL, (u8 *)&cmd->data_crc);
3063
3064 iov[iov_count].iov_base = &cmd->data_crc;
3065 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3066 tx_size += ISCSI_CRC_LEN;
3067
3068 pr_debug("Attaching CRC32 DataDigest for"
3069 " SENSE, %u bytes CRC 0x%08x\n",
3070 (cmd->se_cmd.scsi_sense_length + padding),
3071 cmd->data_crc);
3072 }
3073
3074 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3075 " Response PDU\n",
3076 cmd->se_cmd.scsi_sense_length);
3077 }
3078
3079 if (conn->conn_ops->HeaderDigest) {
3080 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3081
3082 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3083 (unsigned char *)hdr, ISCSI_HDR_LEN,
3084 0, NULL, (u8 *)header_digest);
3085
3086 iov[0].iov_len += ISCSI_CRC_LEN;
3087 tx_size += ISCSI_CRC_LEN;
3088 pr_debug("Attaching CRC32 HeaderDigest for Response"
3089 " PDU 0x%08x\n", *header_digest);
3090 }
3091
3092 cmd->iov_misc_count = iov_count;
3093 cmd->tx_size = tx_size;
3094
3095 pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3096 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3097 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3098 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3099
3100 return 0;
3101 }
3102
3103 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3104 {
3105 switch (se_tmr->response) {
3106 case TMR_FUNCTION_COMPLETE:
3107 return ISCSI_TMF_RSP_COMPLETE;
3108 case TMR_TASK_DOES_NOT_EXIST:
3109 return ISCSI_TMF_RSP_NO_TASK;
3110 case TMR_LUN_DOES_NOT_EXIST:
3111 return ISCSI_TMF_RSP_NO_LUN;
3112 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3113 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3114 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3115 return ISCSI_TMF_RSP_AUTH_FAILED;
3116 case TMR_FUNCTION_REJECTED:
3117 default:
3118 return ISCSI_TMF_RSP_REJECTED;
3119 }
3120 }
3121
3122 static int iscsit_send_task_mgt_rsp(
3123 struct iscsi_cmd *cmd,
3124 struct iscsi_conn *conn)
3125 {
3126 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3127 struct iscsi_tm_rsp *hdr;
3128 u32 tx_size = 0;
3129
3130 hdr = (struct iscsi_tm_rsp *) cmd->pdu;
3131 memset(hdr, 0, ISCSI_HDR_LEN);
3132 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3133 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3134 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3135 cmd->stat_sn = conn->stat_sn++;
3136 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3137
3138 iscsit_increment_maxcmdsn(cmd, conn->sess);
3139 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3140 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3141
3142 cmd->iov_misc[0].iov_base = cmd->pdu;
3143 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3144 tx_size += ISCSI_HDR_LEN;
3145
3146 if (conn->conn_ops->HeaderDigest) {
3147 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3148
3149 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3150 (unsigned char *)hdr, ISCSI_HDR_LEN,
3151 0, NULL, (u8 *)header_digest);
3152
3153 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3154 tx_size += ISCSI_CRC_LEN;
3155 pr_debug("Attaching CRC32 HeaderDigest for Task"
3156 " Mgmt Response PDU 0x%08x\n", *header_digest);
3157 }
3158
3159 cmd->iov_misc_count = 1;
3160 cmd->tx_size = tx_size;
3161
3162 pr_debug("Built Task Management Response ITT: 0x%08x,"
3163 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3164 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3165
3166 return 0;
3167 }
3168
3169 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3170 {
3171 char *payload = NULL;
3172 struct iscsi_conn *conn = cmd->conn;
3173 struct iscsi_portal_group *tpg;
3174 struct iscsi_tiqn *tiqn;
3175 struct iscsi_tpg_np *tpg_np;
3176 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3177 unsigned char buf[256];
3178
3179 buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ?
3180 32768 : conn->conn_ops->MaxRecvDataSegmentLength;
3181
3182 memset(buf, 0, 256);
3183
3184 payload = kzalloc(buffer_len, GFP_KERNEL);
3185 if (!payload) {
3186 pr_err("Unable to allocate memory for sendtargets"
3187 " response.\n");
3188 return -ENOMEM;
3189 }
3190
3191 spin_lock(&tiqn_lock);
3192 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3193 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3194 len += 1;
3195
3196 if ((len + payload_len) > buffer_len) {
3197 spin_unlock(&tiqn->tiqn_tpg_lock);
3198 end_of_buf = 1;
3199 goto eob;
3200 }
3201 memcpy((void *)payload + payload_len, buf, len);
3202 payload_len += len;
3203
3204 spin_lock(&tiqn->tiqn_tpg_lock);
3205 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3206
3207 spin_lock(&tpg->tpg_state_lock);
3208 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3209 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3210 spin_unlock(&tpg->tpg_state_lock);
3211 continue;
3212 }
3213 spin_unlock(&tpg->tpg_state_lock);
3214
3215 spin_lock(&tpg->tpg_np_lock);
3216 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3217 tpg_np_list) {
3218 len = sprintf(buf, "TargetAddress="
3219 "%s%s%s:%hu,%hu",
3220 (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
3221 "[" : "", tpg_np->tpg_np->np_ip,
3222 (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
3223 "]" : "", tpg_np->tpg_np->np_port,
3224 tpg->tpgt);
3225 len += 1;
3226
3227 if ((len + payload_len) > buffer_len) {
3228 spin_unlock(&tpg->tpg_np_lock);
3229 spin_unlock(&tiqn->tiqn_tpg_lock);
3230 end_of_buf = 1;
3231 goto eob;
3232 }
3233 memcpy((void *)payload + payload_len, buf, len);
3234 payload_len += len;
3235 }
3236 spin_unlock(&tpg->tpg_np_lock);
3237 }
3238 spin_unlock(&tiqn->tiqn_tpg_lock);
3239 eob:
3240 if (end_of_buf)
3241 break;
3242 }
3243 spin_unlock(&tiqn_lock);
3244
3245 cmd->buf_ptr = payload;
3246
3247 return payload_len;
3248 }
3249
3250 /*
3251 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3252 * MaxRecvDataSegmentLength.
3253 */
3254 static int iscsit_send_text_rsp(
3255 struct iscsi_cmd *cmd,
3256 struct iscsi_conn *conn)
3257 {
3258 struct iscsi_text_rsp *hdr;
3259 struct kvec *iov;
3260 u32 padding = 0, tx_size = 0;
3261 int text_length, iov_count = 0;
3262
3263 text_length = iscsit_build_sendtargets_response(cmd);
3264 if (text_length < 0)
3265 return text_length;
3266
3267 padding = ((-text_length) & 3);
3268 if (padding != 0) {
3269 memset(cmd->buf_ptr + text_length, 0, padding);
3270 pr_debug("Attaching %u additional bytes for"
3271 " padding.\n", padding);
3272 }
3273
3274 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3275 memset(hdr, 0, ISCSI_HDR_LEN);
3276 hdr->opcode = ISCSI_OP_TEXT_RSP;
3277 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3278 hton24(hdr->dlength, text_length);
3279 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3280 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3281 cmd->stat_sn = conn->stat_sn++;
3282 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3283
3284 iscsit_increment_maxcmdsn(cmd, conn->sess);
3285 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3286 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3287
3288 iov = &cmd->iov_misc[0];
3289
3290 iov[iov_count].iov_base = cmd->pdu;
3291 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3292 iov[iov_count].iov_base = cmd->buf_ptr;
3293 iov[iov_count++].iov_len = text_length + padding;
3294
3295 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3296
3297 if (conn->conn_ops->HeaderDigest) {
3298 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3299
3300 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3301 (unsigned char *)hdr, ISCSI_HDR_LEN,
3302 0, NULL, (u8 *)header_digest);
3303
3304 iov[0].iov_len += ISCSI_CRC_LEN;
3305 tx_size += ISCSI_CRC_LEN;
3306 pr_debug("Attaching CRC32 HeaderDigest for"
3307 " Text Response PDU 0x%08x\n", *header_digest);
3308 }
3309
3310 if (conn->conn_ops->DataDigest) {
3311 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3312 cmd->buf_ptr, (text_length + padding),
3313 0, NULL, (u8 *)&cmd->data_crc);
3314
3315 iov[iov_count].iov_base = &cmd->data_crc;
3316 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3317 tx_size += ISCSI_CRC_LEN;
3318
3319 pr_debug("Attaching DataDigest for %u bytes of text"
3320 " data, CRC 0x%08x\n", (text_length + padding),
3321 cmd->data_crc);
3322 }
3323
3324 cmd->iov_misc_count = iov_count;
3325 cmd->tx_size = tx_size;
3326
3327 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3328 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3329 text_length, conn->cid);
3330 return 0;
3331 }
3332
3333 static int iscsit_send_reject(
3334 struct iscsi_cmd *cmd,
3335 struct iscsi_conn *conn)
3336 {
3337 u32 iov_count = 0, tx_size = 0;
3338 struct iscsi_reject *hdr;
3339 struct kvec *iov;
3340
3341 hdr = (struct iscsi_reject *) cmd->pdu;
3342 hdr->opcode = ISCSI_OP_REJECT;
3343 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3344 hton24(hdr->dlength, ISCSI_HDR_LEN);
3345 cmd->stat_sn = conn->stat_sn++;
3346 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3347 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3348 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3349
3350 iov = &cmd->iov_misc[0];
3351
3352 iov[iov_count].iov_base = cmd->pdu;
3353 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3354 iov[iov_count].iov_base = cmd->buf_ptr;
3355 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3356
3357 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3358
3359 if (conn->conn_ops->HeaderDigest) {
3360 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3361
3362 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3363 (unsigned char *)hdr, ISCSI_HDR_LEN,
3364 0, NULL, (u8 *)header_digest);
3365
3366 iov[0].iov_len += ISCSI_CRC_LEN;
3367 tx_size += ISCSI_CRC_LEN;
3368 pr_debug("Attaching CRC32 HeaderDigest for"
3369 " REJECT PDU 0x%08x\n", *header_digest);
3370 }
3371
3372 if (conn->conn_ops->DataDigest) {
3373 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3374 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3375 0, NULL, (u8 *)&cmd->data_crc);
3376
3377 iov[iov_count].iov_base = &cmd->data_crc;
3378 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3379 tx_size += ISCSI_CRC_LEN;
3380 pr_debug("Attaching CRC32 DataDigest for REJECT"
3381 " PDU 0x%08x\n", cmd->data_crc);
3382 }
3383
3384 cmd->iov_misc_count = iov_count;
3385 cmd->tx_size = tx_size;
3386
3387 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3388 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3389
3390 return 0;
3391 }
3392
3393 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
3394 {
3395 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
3396 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
3397 wait_for_completion_interruptible_timeout(
3398 &conn->tx_half_close_comp,
3399 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
3400 }
3401 }
3402
3403 #ifdef CONFIG_SMP
3404
3405 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3406 {
3407 struct iscsi_thread_set *ts = conn->thread_set;
3408 int ord, cpu;
3409 /*
3410 * thread_id is assigned from iscsit_global->ts_bitmap from
3411 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3412 *
3413 * Here we use thread_id to determine which CPU that this
3414 * iSCSI connection's iscsi_thread_set will be scheduled to
3415 * execute upon.
3416 */
3417 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3418 #if 0
3419 pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from"
3420 " thread_id: %d\n", ord, ts->thread_id);
3421 #endif
3422 for_each_online_cpu(cpu) {
3423 if (ord-- == 0) {
3424 cpumask_set_cpu(cpu, conn->conn_cpumask);
3425 return;
3426 }
3427 }
3428 /*
3429 * This should never be reached..
3430 */
3431 dump_stack();
3432 cpumask_setall(conn->conn_cpumask);
3433 }
3434
3435 static inline void iscsit_thread_check_cpumask(
3436 struct iscsi_conn *conn,
3437 struct task_struct *p,
3438 int mode)
3439 {
3440 char buf[128];
3441 /*
3442 * mode == 1 signals iscsi_target_tx_thread() usage.
3443 * mode == 0 signals iscsi_target_rx_thread() usage.
3444 */
3445 if (mode == 1) {
3446 if (!conn->conn_tx_reset_cpumask)
3447 return;
3448 conn->conn_tx_reset_cpumask = 0;
3449 } else {
3450 if (!conn->conn_rx_reset_cpumask)
3451 return;
3452 conn->conn_rx_reset_cpumask = 0;
3453 }
3454 /*
3455 * Update the CPU mask for this single kthread so that
3456 * both TX and RX kthreads are scheduled to run on the
3457 * same CPU.
3458 */
3459 memset(buf, 0, 128);
3460 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3461 #if 0
3462 pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():"
3463 " %s for %s\n", buf, p->comm);
3464 #endif
3465 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3466 }
3467
3468 #else
3469
3470 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3471 {
3472 return;
3473 }
3474
3475 #define iscsit_thread_check_cpumask(X, Y, Z) ({})
3476 #endif /* CONFIG_SMP */
3477
3478 int iscsi_target_tx_thread(void *arg)
3479 {
3480 u8 state;
3481 int eodr = 0;
3482 int ret = 0;
3483 int sent_status = 0;
3484 int use_misc = 0;
3485 int map_sg = 0;
3486 struct iscsi_cmd *cmd = NULL;
3487 struct iscsi_conn *conn;
3488 struct iscsi_queue_req *qr = NULL;
3489 struct se_cmd *se_cmd;
3490 struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3491 /*
3492 * Allow ourselves to be interrupted by SIGINT so that a
3493 * connection recovery / failure event can be triggered externally.
3494 */
3495 allow_signal(SIGINT);
3496
3497 restart:
3498 conn = iscsi_tx_thread_pre_handler(ts);
3499 if (!conn)
3500 goto out;
3501
3502 eodr = map_sg = ret = sent_status = use_misc = 0;
3503
3504 while (!kthread_should_stop()) {
3505 /*
3506 * Ensure that both TX and RX per connection kthreads
3507 * are scheduled to run on the same CPU.
3508 */
3509 iscsit_thread_check_cpumask(conn, current, 1);
3510
3511 schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
3512
3513 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3514 signal_pending(current))
3515 goto transport_err;
3516
3517 get_immediate:
3518 qr = iscsit_get_cmd_from_immediate_queue(conn);
3519 if (qr) {
3520 atomic_set(&conn->check_immediate_queue, 0);
3521 cmd = qr->cmd;
3522 state = qr->state;
3523 kmem_cache_free(lio_qr_cache, qr);
3524
3525 spin_lock_bh(&cmd->istate_lock);
3526 switch (state) {
3527 case ISTATE_SEND_R2T:
3528 spin_unlock_bh(&cmd->istate_lock);
3529 ret = iscsit_send_r2t(cmd, conn);
3530 break;
3531 case ISTATE_REMOVE:
3532 spin_unlock_bh(&cmd->istate_lock);
3533
3534 if (cmd->data_direction == DMA_TO_DEVICE)
3535 iscsit_stop_dataout_timer(cmd);
3536
3537 spin_lock_bh(&conn->cmd_lock);
3538 list_del(&cmd->i_list);
3539 spin_unlock_bh(&conn->cmd_lock);
3540
3541 iscsit_free_cmd(cmd);
3542 goto get_immediate;
3543 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3544 spin_unlock_bh(&cmd->istate_lock);
3545 iscsit_mod_nopin_response_timer(conn);
3546 ret = iscsit_send_unsolicited_nopin(cmd,
3547 conn, 1);
3548 break;
3549 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3550 spin_unlock_bh(&cmd->istate_lock);
3551 ret = iscsit_send_unsolicited_nopin(cmd,
3552 conn, 0);
3553 break;
3554 default:
3555 pr_err("Unknown Opcode: 0x%02x ITT:"
3556 " 0x%08x, i_state: %d on CID: %hu\n",
3557 cmd->iscsi_opcode, cmd->init_task_tag, state,
3558 conn->cid);
3559 spin_unlock_bh(&cmd->istate_lock);
3560 goto transport_err;
3561 }
3562 if (ret < 0) {
3563 conn->tx_immediate_queue = 0;
3564 goto transport_err;
3565 }
3566
3567 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3568 conn->tx_immediate_queue = 0;
3569 iscsit_tx_thread_wait_for_tcp(conn);
3570 goto transport_err;
3571 }
3572
3573 spin_lock_bh(&cmd->istate_lock);
3574 switch (state) {
3575 case ISTATE_SEND_R2T:
3576 spin_unlock_bh(&cmd->istate_lock);
3577 spin_lock_bh(&cmd->dataout_timeout_lock);
3578 iscsit_start_dataout_timer(cmd, conn);
3579 spin_unlock_bh(&cmd->dataout_timeout_lock);
3580 break;
3581 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3582 cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE;
3583 spin_unlock_bh(&cmd->istate_lock);
3584 break;
3585 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3586 cmd->i_state = ISTATE_SENT_STATUS;
3587 spin_unlock_bh(&cmd->istate_lock);
3588 break;
3589 default:
3590 pr_err("Unknown Opcode: 0x%02x ITT:"
3591 " 0x%08x, i_state: %d on CID: %hu\n",
3592 cmd->iscsi_opcode, cmd->init_task_tag,
3593 state, conn->cid);
3594 spin_unlock_bh(&cmd->istate_lock);
3595 goto transport_err;
3596 }
3597 goto get_immediate;
3598 } else
3599 conn->tx_immediate_queue = 0;
3600
3601 get_response:
3602 qr = iscsit_get_cmd_from_response_queue(conn);
3603 if (qr) {
3604 cmd = qr->cmd;
3605 state = qr->state;
3606 kmem_cache_free(lio_qr_cache, qr);
3607
3608 spin_lock_bh(&cmd->istate_lock);
3609 check_rsp_state:
3610 switch (state) {
3611 case ISTATE_SEND_DATAIN:
3612 spin_unlock_bh(&cmd->istate_lock);
3613 ret = iscsit_send_data_in(cmd, conn,
3614 &eodr);
3615 map_sg = 1;
3616 break;
3617 case ISTATE_SEND_STATUS:
3618 case ISTATE_SEND_STATUS_RECOVERY:
3619 spin_unlock_bh(&cmd->istate_lock);
3620 use_misc = 1;
3621 ret = iscsit_send_status(cmd, conn);
3622 break;
3623 case ISTATE_SEND_LOGOUTRSP:
3624 spin_unlock_bh(&cmd->istate_lock);
3625 use_misc = 1;
3626 ret = iscsit_send_logout_response(cmd, conn);
3627 break;
3628 case ISTATE_SEND_ASYNCMSG:
3629 spin_unlock_bh(&cmd->istate_lock);
3630 use_misc = 1;
3631 ret = iscsit_send_conn_drop_async_message(
3632 cmd, conn);
3633 break;
3634 case ISTATE_SEND_NOPIN:
3635 spin_unlock_bh(&cmd->istate_lock);
3636 use_misc = 1;
3637 ret = iscsit_send_nopin_response(cmd, conn);
3638 break;
3639 case ISTATE_SEND_REJECT:
3640 spin_unlock_bh(&cmd->istate_lock);
3641 use_misc = 1;
3642 ret = iscsit_send_reject(cmd, conn);
3643 break;
3644 case ISTATE_SEND_TASKMGTRSP:
3645 spin_unlock_bh(&cmd->istate_lock);
3646 use_misc = 1;
3647 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3648 if (ret != 0)
3649 break;
3650 ret = iscsit_tmr_post_handler(cmd, conn);
3651 if (ret != 0)
3652 iscsit_fall_back_to_erl0(conn->sess);
3653 break;
3654 case ISTATE_SEND_TEXTRSP:
3655 spin_unlock_bh(&cmd->istate_lock);
3656 use_misc = 1;
3657 ret = iscsit_send_text_rsp(cmd, conn);
3658 break;
3659 default:
3660 pr_err("Unknown Opcode: 0x%02x ITT:"
3661 " 0x%08x, i_state: %d on CID: %hu\n",
3662 cmd->iscsi_opcode, cmd->init_task_tag,
3663 state, conn->cid);
3664 spin_unlock_bh(&cmd->istate_lock);
3665 goto transport_err;
3666 }
3667 if (ret < 0) {
3668 conn->tx_response_queue = 0;
3669 goto transport_err;
3670 }
3671
3672 se_cmd = &cmd->se_cmd;
3673
3674 if (map_sg && !conn->conn_ops->IFMarker) {
3675 if (iscsit_fe_sendpage_sg(cmd, conn) < 0) {
3676 conn->tx_response_queue = 0;
3677 iscsit_tx_thread_wait_for_tcp(conn);
3678 iscsit_unmap_iovec(cmd);
3679 goto transport_err;
3680 }
3681 } else {
3682 if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) {
3683 conn->tx_response_queue = 0;
3684 iscsit_tx_thread_wait_for_tcp(conn);
3685 iscsit_unmap_iovec(cmd);
3686 goto transport_err;
3687 }
3688 }
3689 map_sg = 0;
3690 iscsit_unmap_iovec(cmd);
3691
3692 spin_lock_bh(&cmd->istate_lock);
3693 switch (state) {
3694 case ISTATE_SEND_DATAIN:
3695 if (!eodr)
3696 goto check_rsp_state;
3697
3698 if (eodr == 1) {
3699 cmd->i_state = ISTATE_SENT_LAST_DATAIN;
3700 sent_status = 1;
3701 eodr = use_misc = 0;
3702 } else if (eodr == 2) {
3703 cmd->i_state = state =
3704 ISTATE_SEND_STATUS;
3705 sent_status = 0;
3706 eodr = use_misc = 0;
3707 goto check_rsp_state;
3708 }
3709 break;
3710 case ISTATE_SEND_STATUS:
3711 use_misc = 0;
3712 sent_status = 1;
3713 break;
3714 case ISTATE_SEND_ASYNCMSG:
3715 case ISTATE_SEND_NOPIN:
3716 case ISTATE_SEND_STATUS_RECOVERY:
3717 case ISTATE_SEND_TEXTRSP:
3718 use_misc = 0;
3719 sent_status = 1;
3720 break;
3721 case ISTATE_SEND_REJECT:
3722 use_misc = 0;
3723 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3724 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3725 spin_unlock_bh(&cmd->istate_lock);
3726 complete(&cmd->reject_comp);
3727 goto transport_err;
3728 }
3729 complete(&cmd->reject_comp);
3730 break;
3731 case ISTATE_SEND_TASKMGTRSP:
3732 use_misc = 0;
3733 sent_status = 1;
3734 break;
3735 case ISTATE_SEND_LOGOUTRSP:
3736 spin_unlock_bh(&cmd->istate_lock);
3737 if (!iscsit_logout_post_handler(cmd, conn))
3738 goto restart;
3739 spin_lock_bh(&cmd->istate_lock);
3740 use_misc = 0;
3741 sent_status = 1;
3742 break;
3743 default:
3744 pr_err("Unknown Opcode: 0x%02x ITT:"
3745 " 0x%08x, i_state: %d on CID: %hu\n",
3746 cmd->iscsi_opcode, cmd->init_task_tag,
3747 cmd->i_state, conn->cid);
3748 spin_unlock_bh(&cmd->istate_lock);
3749 goto transport_err;
3750 }
3751
3752 if (sent_status) {
3753 cmd->i_state = ISTATE_SENT_STATUS;
3754 sent_status = 0;
3755 }
3756 spin_unlock_bh(&cmd->istate_lock);
3757
3758 if (atomic_read(&conn->check_immediate_queue))
3759 goto get_immediate;
3760
3761 goto get_response;
3762 } else
3763 conn->tx_response_queue = 0;
3764 }
3765
3766 transport_err:
3767 iscsit_take_action_for_connection_exit(conn);
3768 goto restart;
3769 out:
3770 return 0;
3771 }
3772
3773 int iscsi_target_rx_thread(void *arg)
3774 {
3775 int ret;
3776 u8 buffer[ISCSI_HDR_LEN], opcode;
3777 u32 checksum = 0, digest = 0;
3778 struct iscsi_conn *conn = NULL;
3779 struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3780 struct kvec iov;
3781 /*
3782 * Allow ourselves to be interrupted by SIGINT so that a
3783 * connection recovery / failure event can be triggered externally.
3784 */
3785 allow_signal(SIGINT);
3786
3787 restart:
3788 conn = iscsi_rx_thread_pre_handler(ts);
3789 if (!conn)
3790 goto out;
3791
3792 while (!kthread_should_stop()) {
3793 /*
3794 * Ensure that both TX and RX per connection kthreads
3795 * are scheduled to run on the same CPU.
3796 */
3797 iscsit_thread_check_cpumask(conn, current, 0);
3798
3799 memset(buffer, 0, ISCSI_HDR_LEN);
3800 memset(&iov, 0, sizeof(struct kvec));
3801
3802 iov.iov_base = buffer;
3803 iov.iov_len = ISCSI_HDR_LEN;
3804
3805 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3806 if (ret != ISCSI_HDR_LEN) {
3807 iscsit_rx_thread_wait_for_tcp(conn);
3808 goto transport_err;
3809 }
3810
3811 /*
3812 * Set conn->bad_hdr for use with REJECT PDUs.
3813 */
3814 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3815
3816 if (conn->conn_ops->HeaderDigest) {
3817 iov.iov_base = &digest;
3818 iov.iov_len = ISCSI_CRC_LEN;
3819
3820 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3821 if (ret != ISCSI_CRC_LEN) {
3822 iscsit_rx_thread_wait_for_tcp(conn);
3823 goto transport_err;
3824 }
3825
3826 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3827 buffer, ISCSI_HDR_LEN,
3828 0, NULL, (u8 *)&checksum);
3829
3830 if (digest != checksum) {
3831 pr_err("HeaderDigest CRC32C failed,"
3832 " received 0x%08x, computed 0x%08x\n",
3833 digest, checksum);
3834 /*
3835 * Set the PDU to 0xff so it will intentionally
3836 * hit default in the switch below.
3837 */
3838 memset(buffer, 0xff, ISCSI_HDR_LEN);
3839 spin_lock_bh(&conn->sess->session_stats_lock);
3840 conn->sess->conn_digest_errors++;
3841 spin_unlock_bh(&conn->sess->session_stats_lock);
3842 } else {
3843 pr_debug("Got HeaderDigest CRC32C"
3844 " 0x%08x\n", checksum);
3845 }
3846 }
3847
3848 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3849 goto transport_err;
3850
3851 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3852
3853 if (conn->sess->sess_ops->SessionType &&
3854 ((!(opcode & ISCSI_OP_TEXT)) ||
3855 (!(opcode & ISCSI_OP_LOGOUT)))) {
3856 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3857 " while in Discovery Session, rejecting.\n", opcode);
3858 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3859 buffer, conn);
3860 goto transport_err;
3861 }
3862
3863 switch (opcode) {
3864 case ISCSI_OP_SCSI_CMD:
3865 if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3866 goto transport_err;
3867 break;
3868 case ISCSI_OP_SCSI_DATA_OUT:
3869 if (iscsit_handle_data_out(conn, buffer) < 0)
3870 goto transport_err;
3871 break;
3872 case ISCSI_OP_NOOP_OUT:
3873 if (iscsit_handle_nop_out(conn, buffer) < 0)
3874 goto transport_err;
3875 break;
3876 case ISCSI_OP_SCSI_TMFUNC:
3877 if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3878 goto transport_err;
3879 break;
3880 case ISCSI_OP_TEXT:
3881 if (iscsit_handle_text_cmd(conn, buffer) < 0)
3882 goto transport_err;
3883 break;
3884 case ISCSI_OP_LOGOUT:
3885 ret = iscsit_handle_logout_cmd(conn, buffer);
3886 if (ret > 0) {
3887 wait_for_completion_timeout(&conn->conn_logout_comp,
3888 SECONDS_FOR_LOGOUT_COMP * HZ);
3889 goto transport_err;
3890 } else if (ret < 0)
3891 goto transport_err;
3892 break;
3893 case ISCSI_OP_SNACK:
3894 if (iscsit_handle_snack(conn, buffer) < 0)
3895 goto transport_err;
3896 break;
3897 default:
3898 pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3899 opcode);
3900 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3901 pr_err("Cannot recover from unknown"
3902 " opcode while ERL=0, closing iSCSI connection"
3903 ".\n");
3904 goto transport_err;
3905 }
3906 if (!conn->conn_ops->OFMarker) {
3907 pr_err("Unable to recover from unknown"
3908 " opcode while OFMarker=No, closing iSCSI"
3909 " connection.\n");
3910 goto transport_err;
3911 }
3912 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3913 pr_err("Unable to recover from unknown"
3914 " opcode, closing iSCSI connection.\n");
3915 goto transport_err;
3916 }
3917 break;
3918 }
3919 }
3920
3921 transport_err:
3922 if (!signal_pending(current))
3923 atomic_set(&conn->transport_failed, 1);
3924 iscsit_take_action_for_connection_exit(conn);
3925 goto restart;
3926 out:
3927 return 0;
3928 }
3929
3930 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3931 {
3932 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3933 struct iscsi_session *sess = conn->sess;
3934 /*
3935 * We expect this function to only ever be called from either RX or TX
3936 * thread context via iscsit_close_connection() once the other context
3937 * has been reset -> returned sleeping pre-handler state.
3938 */
3939 spin_lock_bh(&conn->cmd_lock);
3940 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) {
3941
3942 list_del(&cmd->i_list);
3943 spin_unlock_bh(&conn->cmd_lock);
3944
3945 iscsit_increment_maxcmdsn(cmd, sess);
3946
3947 iscsit_free_cmd(cmd);
3948
3949 spin_lock_bh(&conn->cmd_lock);
3950 }
3951 spin_unlock_bh(&conn->cmd_lock);
3952 }
3953
3954 static void iscsit_stop_timers_for_cmds(
3955 struct iscsi_conn *conn)
3956 {
3957 struct iscsi_cmd *cmd;
3958
3959 spin_lock_bh(&conn->cmd_lock);
3960 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
3961 if (cmd->data_direction == DMA_TO_DEVICE)
3962 iscsit_stop_dataout_timer(cmd);
3963 }
3964 spin_unlock_bh(&conn->cmd_lock);
3965 }
3966
3967 int iscsit_close_connection(
3968 struct iscsi_conn *conn)
3969 {
3970 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3971 struct iscsi_session *sess = conn->sess;
3972
3973 pr_debug("Closing iSCSI connection CID %hu on SID:"
3974 " %u\n", conn->cid, sess->sid);
3975 /*
3976 * Always up conn_logout_comp just in case the RX Thread is sleeping
3977 * and the logout response never got sent because the connection
3978 * failed.
3979 */
3980 complete(&conn->conn_logout_comp);
3981
3982 iscsi_release_thread_set(conn);
3983
3984 iscsit_stop_timers_for_cmds(conn);
3985 iscsit_stop_nopin_response_timer(conn);
3986 iscsit_stop_nopin_timer(conn);
3987 iscsit_free_queue_reqs_for_conn(conn);
3988
3989 /*
3990 * During Connection recovery drop unacknowledged out of order
3991 * commands for this connection, and prepare the other commands
3992 * for realligence.
3993 *
3994 * During normal operation clear the out of order commands (but
3995 * do not free the struct iscsi_ooo_cmdsn's) and release all
3996 * struct iscsi_cmds.
3997 */
3998 if (atomic_read(&conn->connection_recovery)) {
3999 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4000 iscsit_prepare_cmds_for_realligance(conn);
4001 } else {
4002 iscsit_clear_ooo_cmdsns_for_conn(conn);
4003 iscsit_release_commands_from_conn(conn);
4004 }
4005
4006 /*
4007 * Handle decrementing session or connection usage count if
4008 * a logout response was not able to be sent because the
4009 * connection failed. Fall back to Session Recovery here.
4010 */
4011 if (atomic_read(&conn->conn_logout_remove)) {
4012 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4013 iscsit_dec_conn_usage_count(conn);
4014 iscsit_dec_session_usage_count(sess);
4015 }
4016 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4017 iscsit_dec_conn_usage_count(conn);
4018
4019 atomic_set(&conn->conn_logout_remove, 0);
4020 atomic_set(&sess->session_reinstatement, 0);
4021 atomic_set(&sess->session_fall_back_to_erl0, 1);
4022 }
4023
4024 spin_lock_bh(&sess->conn_lock);
4025 list_del(&conn->conn_list);
4026
4027 /*
4028 * Attempt to let the Initiator know this connection failed by
4029 * sending an Connection Dropped Async Message on another
4030 * active connection.
4031 */
4032 if (atomic_read(&conn->connection_recovery))
4033 iscsit_build_conn_drop_async_message(conn);
4034
4035 spin_unlock_bh(&sess->conn_lock);
4036
4037 /*
4038 * If connection reinstatement is being performed on this connection,
4039 * up the connection reinstatement semaphore that is being blocked on
4040 * in iscsit_cause_connection_reinstatement().
4041 */
4042 spin_lock_bh(&conn->state_lock);
4043 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4044 spin_unlock_bh(&conn->state_lock);
4045 complete(&conn->conn_wait_comp);
4046 wait_for_completion(&conn->conn_post_wait_comp);
4047 spin_lock_bh(&conn->state_lock);
4048 }
4049
4050 /*
4051 * If connection reinstatement is being performed on this connection
4052 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4053 * connection wait rcfr semaphore that is being blocked on
4054 * an iscsit_connection_reinstatement_rcfr().
4055 */
4056 if (atomic_read(&conn->connection_wait_rcfr)) {
4057 spin_unlock_bh(&conn->state_lock);
4058 complete(&conn->conn_wait_rcfr_comp);
4059 wait_for_completion(&conn->conn_post_wait_comp);
4060 spin_lock_bh(&conn->state_lock);
4061 }
4062 atomic_set(&conn->connection_reinstatement, 1);
4063 spin_unlock_bh(&conn->state_lock);
4064
4065 /*
4066 * If any other processes are accessing this connection pointer we
4067 * must wait until they have completed.
4068 */
4069 iscsit_check_conn_usage_count(conn);
4070
4071 if (conn->conn_rx_hash.tfm)
4072 crypto_free_hash(conn->conn_rx_hash.tfm);
4073 if (conn->conn_tx_hash.tfm)
4074 crypto_free_hash(conn->conn_tx_hash.tfm);
4075
4076 if (conn->conn_cpumask)
4077 free_cpumask_var(conn->conn_cpumask);
4078
4079 kfree(conn->conn_ops);
4080 conn->conn_ops = NULL;
4081
4082 if (conn->sock) {
4083 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
4084 kfree(conn->sock->file);
4085 conn->sock->file = NULL;
4086 }
4087 sock_release(conn->sock);
4088 }
4089 conn->thread_set = NULL;
4090
4091 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4092 conn->conn_state = TARG_CONN_STATE_FREE;
4093 kfree(conn);
4094
4095 spin_lock_bh(&sess->conn_lock);
4096 atomic_dec(&sess->nconn);
4097 pr_debug("Decremented iSCSI connection count to %hu from node:"
4098 " %s\n", atomic_read(&sess->nconn),
4099 sess->sess_ops->InitiatorName);
4100 /*
4101 * Make sure that if one connection fails in an non ERL=2 iSCSI
4102 * Session that they all fail.
4103 */
4104 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4105 !atomic_read(&sess->session_logout))
4106 atomic_set(&sess->session_fall_back_to_erl0, 1);
4107
4108 /*
4109 * If this was not the last connection in the session, and we are
4110 * performing session reinstatement or falling back to ERL=0, call
4111 * iscsit_stop_session() without sleeping to shutdown the other
4112 * active connections.
4113 */
4114 if (atomic_read(&sess->nconn)) {
4115 if (!atomic_read(&sess->session_reinstatement) &&
4116 !atomic_read(&sess->session_fall_back_to_erl0)) {
4117 spin_unlock_bh(&sess->conn_lock);
4118 return 0;
4119 }
4120 if (!atomic_read(&sess->session_stop_active)) {
4121 atomic_set(&sess->session_stop_active, 1);
4122 spin_unlock_bh(&sess->conn_lock);
4123 iscsit_stop_session(sess, 0, 0);
4124 return 0;
4125 }
4126 spin_unlock_bh(&sess->conn_lock);
4127 return 0;
4128 }
4129
4130 /*
4131 * If this was the last connection in the session and one of the
4132 * following is occurring:
4133 *
4134 * Session Reinstatement is not being performed, and are falling back
4135 * to ERL=0 call iscsit_close_session().
4136 *
4137 * Session Logout was requested. iscsit_close_session() will be called
4138 * elsewhere.
4139 *
4140 * Session Continuation is not being performed, start the Time2Retain
4141 * handler and check if sleep_on_sess_wait_sem is active.
4142 */
4143 if (!atomic_read(&sess->session_reinstatement) &&
4144 atomic_read(&sess->session_fall_back_to_erl0)) {
4145 spin_unlock_bh(&sess->conn_lock);
4146 iscsit_close_session(sess);
4147
4148 return 0;
4149 } else if (atomic_read(&sess->session_logout)) {
4150 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4151 sess->session_state = TARG_SESS_STATE_FREE;
4152 spin_unlock_bh(&sess->conn_lock);
4153
4154 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4155 complete(&sess->session_wait_comp);
4156
4157 return 0;
4158 } else {
4159 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4160 sess->session_state = TARG_SESS_STATE_FAILED;
4161
4162 if (!atomic_read(&sess->session_continuation)) {
4163 spin_unlock_bh(&sess->conn_lock);
4164 iscsit_start_time2retain_handler(sess);
4165 } else
4166 spin_unlock_bh(&sess->conn_lock);
4167
4168 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4169 complete(&sess->session_wait_comp);
4170
4171 return 0;
4172 }
4173 spin_unlock_bh(&sess->conn_lock);
4174
4175 return 0;
4176 }
4177
4178 int iscsit_close_session(struct iscsi_session *sess)
4179 {
4180 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4181 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4182
4183 if (atomic_read(&sess->nconn)) {
4184 pr_err("%d connection(s) still exist for iSCSI session"
4185 " to %s\n", atomic_read(&sess->nconn),
4186 sess->sess_ops->InitiatorName);
4187 BUG();
4188 }
4189
4190 spin_lock_bh(&se_tpg->session_lock);
4191 atomic_set(&sess->session_logout, 1);
4192 atomic_set(&sess->session_reinstatement, 1);
4193 iscsit_stop_time2retain_timer(sess);
4194 spin_unlock_bh(&se_tpg->session_lock);
4195
4196 /*
4197 * transport_deregister_session_configfs() will clear the
4198 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4199 * can be setting it again with __transport_register_session() in
4200 * iscsi_post_login_handler() again after the iscsit_stop_session()
4201 * completes in iscsi_np context.
4202 */
4203 transport_deregister_session_configfs(sess->se_sess);
4204
4205 /*
4206 * If any other processes are accessing this session pointer we must
4207 * wait until they have completed. If we are in an interrupt (the
4208 * time2retain handler) and contain and active session usage count we
4209 * restart the timer and exit.
4210 */
4211 if (!in_interrupt()) {
4212 if (iscsit_check_session_usage_count(sess) == 1)
4213 iscsit_stop_session(sess, 1, 1);
4214 } else {
4215 if (iscsit_check_session_usage_count(sess) == 2) {
4216 atomic_set(&sess->session_logout, 0);
4217 iscsit_start_time2retain_handler(sess);
4218 return 0;
4219 }
4220 }
4221
4222 transport_deregister_session(sess->se_sess);
4223
4224 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4225 iscsit_free_connection_recovery_entires(sess);
4226
4227 iscsit_free_all_ooo_cmdsns(sess);
4228
4229 spin_lock_bh(&se_tpg->session_lock);
4230 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4231 sess->session_state = TARG_SESS_STATE_FREE;
4232 pr_debug("Released iSCSI session from node: %s\n",
4233 sess->sess_ops->InitiatorName);
4234 tpg->nsessions--;
4235 if (tpg->tpg_tiqn)
4236 tpg->tpg_tiqn->tiqn_nsessions--;
4237
4238 pr_debug("Decremented number of active iSCSI Sessions on"
4239 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4240
4241 spin_lock(&sess_idr_lock);
4242 idr_remove(&sess_idr, sess->session_index);
4243 spin_unlock(&sess_idr_lock);
4244
4245 kfree(sess->sess_ops);
4246 sess->sess_ops = NULL;
4247 spin_unlock_bh(&se_tpg->session_lock);
4248
4249 kfree(sess);
4250 return 0;
4251 }
4252
4253 static void iscsit_logout_post_handler_closesession(
4254 struct iscsi_conn *conn)
4255 {
4256 struct iscsi_session *sess = conn->sess;
4257
4258 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4259 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4260
4261 atomic_set(&conn->conn_logout_remove, 0);
4262 complete(&conn->conn_logout_comp);
4263
4264 iscsit_dec_conn_usage_count(conn);
4265 iscsit_stop_session(sess, 1, 1);
4266 iscsit_dec_session_usage_count(sess);
4267 iscsit_close_session(sess);
4268 }
4269
4270 static void iscsit_logout_post_handler_samecid(
4271 struct iscsi_conn *conn)
4272 {
4273 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4274 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4275
4276 atomic_set(&conn->conn_logout_remove, 0);
4277 complete(&conn->conn_logout_comp);
4278
4279 iscsit_cause_connection_reinstatement(conn, 1);
4280 iscsit_dec_conn_usage_count(conn);
4281 }
4282
4283 static void iscsit_logout_post_handler_diffcid(
4284 struct iscsi_conn *conn,
4285 u16 cid)
4286 {
4287 struct iscsi_conn *l_conn;
4288 struct iscsi_session *sess = conn->sess;
4289
4290 if (!sess)
4291 return;
4292
4293 spin_lock_bh(&sess->conn_lock);
4294 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4295 if (l_conn->cid == cid) {
4296 iscsit_inc_conn_usage_count(l_conn);
4297 break;
4298 }
4299 }
4300 spin_unlock_bh(&sess->conn_lock);
4301
4302 if (!l_conn)
4303 return;
4304
4305 if (l_conn->sock)
4306 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4307
4308 spin_lock_bh(&l_conn->state_lock);
4309 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4310 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4311 spin_unlock_bh(&l_conn->state_lock);
4312
4313 iscsit_cause_connection_reinstatement(l_conn, 1);
4314 iscsit_dec_conn_usage_count(l_conn);
4315 }
4316
4317 /*
4318 * Return of 0 causes the TX thread to restart.
4319 */
4320 static int iscsit_logout_post_handler(
4321 struct iscsi_cmd *cmd,
4322 struct iscsi_conn *conn)
4323 {
4324 int ret = 0;
4325
4326 switch (cmd->logout_reason) {
4327 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4328 switch (cmd->logout_response) {
4329 case ISCSI_LOGOUT_SUCCESS:
4330 case ISCSI_LOGOUT_CLEANUP_FAILED:
4331 default:
4332 iscsit_logout_post_handler_closesession(conn);
4333 break;
4334 }
4335 ret = 0;
4336 break;
4337 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4338 if (conn->cid == cmd->logout_cid) {
4339 switch (cmd->logout_response) {
4340 case ISCSI_LOGOUT_SUCCESS:
4341 case ISCSI_LOGOUT_CLEANUP_FAILED:
4342 default:
4343 iscsit_logout_post_handler_samecid(conn);
4344 break;
4345 }
4346 ret = 0;
4347 } else {
4348 switch (cmd->logout_response) {
4349 case ISCSI_LOGOUT_SUCCESS:
4350 iscsit_logout_post_handler_diffcid(conn,
4351 cmd->logout_cid);
4352 break;
4353 case ISCSI_LOGOUT_CID_NOT_FOUND:
4354 case ISCSI_LOGOUT_CLEANUP_FAILED:
4355 default:
4356 break;
4357 }
4358 ret = 1;
4359 }
4360 break;
4361 case ISCSI_LOGOUT_REASON_RECOVERY:
4362 switch (cmd->logout_response) {
4363 case ISCSI_LOGOUT_SUCCESS:
4364 case ISCSI_LOGOUT_CID_NOT_FOUND:
4365 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4366 case ISCSI_LOGOUT_CLEANUP_FAILED:
4367 default:
4368 break;
4369 }
4370 ret = 1;
4371 break;
4372 default:
4373 break;
4374
4375 }
4376 return ret;
4377 }
4378
4379 void iscsit_fail_session(struct iscsi_session *sess)
4380 {
4381 struct iscsi_conn *conn;
4382
4383 spin_lock_bh(&sess->conn_lock);
4384 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4385 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4386 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4387 }
4388 spin_unlock_bh(&sess->conn_lock);
4389
4390 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4391 sess->session_state = TARG_SESS_STATE_FAILED;
4392 }
4393
4394 int iscsit_free_session(struct iscsi_session *sess)
4395 {
4396 u16 conn_count = atomic_read(&sess->nconn);
4397 struct iscsi_conn *conn, *conn_tmp = NULL;
4398 int is_last;
4399
4400 spin_lock_bh(&sess->conn_lock);
4401 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4402
4403 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4404 conn_list) {
4405 if (conn_count == 0)
4406 break;
4407
4408 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4409 is_last = 1;
4410 } else {
4411 iscsit_inc_conn_usage_count(conn_tmp);
4412 is_last = 0;
4413 }
4414 iscsit_inc_conn_usage_count(conn);
4415
4416 spin_unlock_bh(&sess->conn_lock);
4417 iscsit_cause_connection_reinstatement(conn, 1);
4418 spin_lock_bh(&sess->conn_lock);
4419
4420 iscsit_dec_conn_usage_count(conn);
4421 if (is_last == 0)
4422 iscsit_dec_conn_usage_count(conn_tmp);
4423
4424 conn_count--;
4425 }
4426
4427 if (atomic_read(&sess->nconn)) {
4428 spin_unlock_bh(&sess->conn_lock);
4429 wait_for_completion(&sess->session_wait_comp);
4430 } else
4431 spin_unlock_bh(&sess->conn_lock);
4432
4433 iscsit_close_session(sess);
4434 return 0;
4435 }
4436
4437 void iscsit_stop_session(
4438 struct iscsi_session *sess,
4439 int session_sleep,
4440 int connection_sleep)
4441 {
4442 u16 conn_count = atomic_read(&sess->nconn);
4443 struct iscsi_conn *conn, *conn_tmp = NULL;
4444 int is_last;
4445
4446 spin_lock_bh(&sess->conn_lock);
4447 if (session_sleep)
4448 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4449
4450 if (connection_sleep) {
4451 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4452 conn_list) {
4453 if (conn_count == 0)
4454 break;
4455
4456 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4457 is_last = 1;
4458 } else {
4459 iscsit_inc_conn_usage_count(conn_tmp);
4460 is_last = 0;
4461 }
4462 iscsit_inc_conn_usage_count(conn);
4463
4464 spin_unlock_bh(&sess->conn_lock);
4465 iscsit_cause_connection_reinstatement(conn, 1);
4466 spin_lock_bh(&sess->conn_lock);
4467
4468 iscsit_dec_conn_usage_count(conn);
4469 if (is_last == 0)
4470 iscsit_dec_conn_usage_count(conn_tmp);
4471 conn_count--;
4472 }
4473 } else {
4474 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4475 iscsit_cause_connection_reinstatement(conn, 0);
4476 }
4477
4478 if (session_sleep && atomic_read(&sess->nconn)) {
4479 spin_unlock_bh(&sess->conn_lock);
4480 wait_for_completion(&sess->session_wait_comp);
4481 } else
4482 spin_unlock_bh(&sess->conn_lock);
4483 }
4484
4485 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4486 {
4487 struct iscsi_session *sess;
4488 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4489 struct se_session *se_sess, *se_sess_tmp;
4490 int session_count = 0;
4491
4492 spin_lock_bh(&se_tpg->session_lock);
4493 if (tpg->nsessions && !force) {
4494 spin_unlock_bh(&se_tpg->session_lock);
4495 return -1;
4496 }
4497
4498 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4499 sess_list) {
4500 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4501
4502 spin_lock(&sess->conn_lock);
4503 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4504 atomic_read(&sess->session_logout) ||
4505 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4506 spin_unlock(&sess->conn_lock);
4507 continue;
4508 }
4509 atomic_set(&sess->session_reinstatement, 1);
4510 spin_unlock(&sess->conn_lock);
4511 spin_unlock_bh(&se_tpg->session_lock);
4512
4513 iscsit_free_session(sess);
4514 spin_lock_bh(&se_tpg->session_lock);
4515
4516 session_count++;
4517 }
4518 spin_unlock_bh(&se_tpg->session_lock);
4519
4520 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4521 " Group: %hu\n", session_count, tpg->tpgt);
4522 return 0;
4523 }
4524
4525 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4526 MODULE_VERSION("4.1.x");
4527 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4528 MODULE_LICENSE("GPL");
4529
4530 module_init(iscsi_target_init_module);
4531 module_exit(iscsi_target_cleanup_module);
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