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Merge branch 'for-davem' of git://git.kernel.org/pub/scm/linux/kernel/git/linville...
[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 if (ret == PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES)
1021 return iscsit_add_reject_from_cmd(
1022 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1023 1, 1, buf, cmd);
1024
1025 send_check_condition = 1;
1026 goto attach_cmd;
1027 }
1028 /*
1029 * The Initiator Node has access to the LUN (the addressing method
1030 * is handled inside of iscsit_get_lun_for_cmd()). Now it's time to
1031 * allocate 1->N transport tasks (depending on sector count and
1032 * maximum request size the physical HBA(s) can handle.
1033 */
1034 transport_ret = transport_generic_allocate_tasks(&cmd->se_cmd, hdr->cdb);
1035 if (transport_ret == -ENOMEM) {
1036 return iscsit_add_reject_from_cmd(
1037 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1038 1, 1, buf, cmd);
1039 } else if (transport_ret == -EINVAL) {
1040 /*
1041 * Unsupported SAM Opcode. CHECK_CONDITION will be sent
1042 * in iscsit_execute_cmd() during the CmdSN OOO Execution
1043 * Mechinism.
1044 */
1045 send_check_condition = 1;
1046 } else {
1047 if (iscsit_decide_list_to_build(cmd, payload_length) < 0)
1048 return iscsit_add_reject_from_cmd(
1049 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1050 1, 1, buf, cmd);
1051 }
1052
1053 attach_cmd:
1054 spin_lock_bh(&conn->cmd_lock);
1055 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1056 spin_unlock_bh(&conn->cmd_lock);
1057 /*
1058 * Check if we need to delay processing because of ALUA
1059 * Active/NonOptimized primary access state..
1060 */
1061 core_alua_check_nonop_delay(&cmd->se_cmd);
1062 /*
1063 * Allocate and setup SGL used with transport_generic_map_mem_to_cmd().
1064 * also call iscsit_allocate_iovecs()
1065 */
1066 ret = iscsit_alloc_buffs(cmd);
1067 if (ret < 0)
1068 return iscsit_add_reject_from_cmd(
1069 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1070 1, 1, buf, cmd);
1071 /*
1072 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1073 * the Immediate Bit is not set, and no Immediate
1074 * Data is attached.
1075 *
1076 * A PDU/CmdSN carrying Immediate Data can only
1077 * be processed after the DataCRC has passed.
1078 * If the DataCRC fails, the CmdSN MUST NOT
1079 * be acknowledged. (See below)
1080 */
1081 if (!cmd->immediate_data) {
1082 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1083 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1084 return 0;
1085 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1086 return iscsit_add_reject_from_cmd(
1087 ISCSI_REASON_PROTOCOL_ERROR,
1088 1, 0, buf, cmd);
1089 }
1090
1091 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1092
1093 /*
1094 * If no Immediate Data is attached, it's OK to return now.
1095 */
1096 if (!cmd->immediate_data) {
1097 if (send_check_condition)
1098 return 0;
1099
1100 if (cmd->unsolicited_data) {
1101 iscsit_set_dataout_sequence_values(cmd);
1102
1103 spin_lock_bh(&cmd->dataout_timeout_lock);
1104 iscsit_start_dataout_timer(cmd, cmd->conn);
1105 spin_unlock_bh(&cmd->dataout_timeout_lock);
1106 }
1107
1108 return 0;
1109 }
1110
1111 /*
1112 * Early CHECK_CONDITIONs never make it to the transport processing
1113 * thread. They are processed in CmdSN order by
1114 * iscsit_check_received_cmdsn() below.
1115 */
1116 if (send_check_condition) {
1117 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1118 dump_immediate_data = 1;
1119 goto after_immediate_data;
1120 }
1121 /*
1122 * Call directly into transport_generic_new_cmd() to perform
1123 * the backend memory allocation.
1124 */
1125 ret = transport_generic_new_cmd(&cmd->se_cmd);
1126 if ((ret < 0) || (cmd->se_cmd.se_cmd_flags & SCF_SE_CMD_FAILED)) {
1127 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1128 dump_immediate_data = 1;
1129 goto after_immediate_data;
1130 }
1131
1132 immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1133 after_immediate_data:
1134 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1135 /*
1136 * A PDU/CmdSN carrying Immediate Data passed
1137 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1138 * Immediate Bit is not set.
1139 */
1140 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1141 /*
1142 * Special case for Unsupported SAM WRITE Opcodes
1143 * and ImmediateData=Yes.
1144 */
1145 if (dump_immediate_data) {
1146 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1147 return -1;
1148 } else if (cmd->unsolicited_data) {
1149 iscsit_set_dataout_sequence_values(cmd);
1150
1151 spin_lock_bh(&cmd->dataout_timeout_lock);
1152 iscsit_start_dataout_timer(cmd, cmd->conn);
1153 spin_unlock_bh(&cmd->dataout_timeout_lock);
1154 }
1155
1156 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1157 return iscsit_add_reject_from_cmd(
1158 ISCSI_REASON_PROTOCOL_ERROR,
1159 1, 0, buf, cmd);
1160
1161 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1162 /*
1163 * Immediate Data failed DataCRC and ERL>=1,
1164 * silently drop this PDU and let the initiator
1165 * plug the CmdSN gap.
1166 *
1167 * FIXME: Send Unsolicited NOPIN with reserved
1168 * TTT here to help the initiator figure out
1169 * the missing CmdSN, although they should be
1170 * intelligent enough to determine the missing
1171 * CmdSN and issue a retry to plug the sequence.
1172 */
1173 cmd->i_state = ISTATE_REMOVE;
1174 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1175 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1176 return -1;
1177
1178 return 0;
1179 }
1180
1181 static u32 iscsit_do_crypto_hash_sg(
1182 struct hash_desc *hash,
1183 struct iscsi_cmd *cmd,
1184 u32 data_offset,
1185 u32 data_length,
1186 u32 padding,
1187 u8 *pad_bytes)
1188 {
1189 u32 data_crc;
1190 u32 i;
1191 struct scatterlist *sg;
1192 unsigned int page_off;
1193
1194 crypto_hash_init(hash);
1195
1196 sg = cmd->first_data_sg;
1197 page_off = cmd->first_data_sg_off;
1198
1199 i = 0;
1200 while (data_length) {
1201 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1202
1203 crypto_hash_update(hash, &sg[i], cur_len);
1204
1205 data_length -= cur_len;
1206 page_off = 0;
1207 i++;
1208 }
1209
1210 if (padding) {
1211 struct scatterlist pad_sg;
1212
1213 sg_init_one(&pad_sg, pad_bytes, padding);
1214 crypto_hash_update(hash, &pad_sg, padding);
1215 }
1216 crypto_hash_final(hash, (u8 *) &data_crc);
1217
1218 return data_crc;
1219 }
1220
1221 static void iscsit_do_crypto_hash_buf(
1222 struct hash_desc *hash,
1223 unsigned char *buf,
1224 u32 payload_length,
1225 u32 padding,
1226 u8 *pad_bytes,
1227 u8 *data_crc)
1228 {
1229 struct scatterlist sg;
1230
1231 crypto_hash_init(hash);
1232
1233 sg_init_one(&sg, (u8 *)buf, payload_length);
1234 crypto_hash_update(hash, &sg, payload_length);
1235
1236 if (padding) {
1237 sg_init_one(&sg, pad_bytes, padding);
1238 crypto_hash_update(hash, &sg, padding);
1239 }
1240 crypto_hash_final(hash, data_crc);
1241 }
1242
1243 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1244 {
1245 int iov_ret, ooo_cmdsn = 0, ret;
1246 u8 data_crc_failed = 0;
1247 u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1248 u32 rx_size = 0, payload_length;
1249 struct iscsi_cmd *cmd = NULL;
1250 struct se_cmd *se_cmd;
1251 struct iscsi_data *hdr;
1252 struct kvec *iov;
1253 unsigned long flags;
1254
1255 hdr = (struct iscsi_data *) buf;
1256 payload_length = ntoh24(hdr->dlength);
1257 hdr->itt = be32_to_cpu(hdr->itt);
1258 hdr->ttt = be32_to_cpu(hdr->ttt);
1259 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1260 hdr->datasn = be32_to_cpu(hdr->datasn);
1261 hdr->offset = be32_to_cpu(hdr->offset);
1262
1263 if (!payload_length) {
1264 pr_err("DataOUT payload is ZERO, protocol error.\n");
1265 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1266 buf, conn);
1267 }
1268
1269 /* iSCSI write */
1270 spin_lock_bh(&conn->sess->session_stats_lock);
1271 conn->sess->rx_data_octets += payload_length;
1272 if (conn->sess->se_sess->se_node_acl) {
1273 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1274 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1275 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1276 }
1277 spin_unlock_bh(&conn->sess->session_stats_lock);
1278
1279 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1280 pr_err("DataSegmentLength: %u is greater than"
1281 " MaxRecvDataSegmentLength: %u\n", payload_length,
1282 conn->conn_ops->MaxRecvDataSegmentLength);
1283 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1284 buf, conn);
1285 }
1286
1287 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1288 payload_length);
1289 if (!cmd)
1290 return 0;
1291
1292 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1293 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1294 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1295 payload_length, conn->cid);
1296
1297 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1298 pr_err("Command ITT: 0x%08x received DataOUT after"
1299 " last DataOUT received, dumping payload\n",
1300 cmd->init_task_tag);
1301 return iscsit_dump_data_payload(conn, payload_length, 1);
1302 }
1303
1304 if (cmd->data_direction != DMA_TO_DEVICE) {
1305 pr_err("Command ITT: 0x%08x received DataOUT for a"
1306 " NON-WRITE command.\n", cmd->init_task_tag);
1307 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1308 1, 0, buf, cmd);
1309 }
1310 se_cmd = &cmd->se_cmd;
1311 iscsit_mod_dataout_timer(cmd);
1312
1313 if ((hdr->offset + payload_length) > cmd->data_length) {
1314 pr_err("DataOut Offset: %u, Length %u greater than"
1315 " iSCSI Command EDTL %u, protocol error.\n",
1316 hdr->offset, payload_length, cmd->data_length);
1317 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1318 1, 0, buf, cmd);
1319 }
1320
1321 if (cmd->unsolicited_data) {
1322 int dump_unsolicited_data = 0;
1323
1324 if (conn->sess->sess_ops->InitialR2T) {
1325 pr_err("Received unexpected unsolicited data"
1326 " while InitialR2T=Yes, protocol error.\n");
1327 transport_send_check_condition_and_sense(&cmd->se_cmd,
1328 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1329 return -1;
1330 }
1331 /*
1332 * Special case for dealing with Unsolicited DataOUT
1333 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1334 * failures;
1335 */
1336
1337 /* Something's amiss if we're not in WRITE_PENDING state... */
1338 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1339 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1340 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1341
1342 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1343 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1344 (se_cmd->se_cmd_flags & SCF_SE_CMD_FAILED))
1345 dump_unsolicited_data = 1;
1346 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1347
1348 if (dump_unsolicited_data) {
1349 /*
1350 * Check if a delayed TASK_ABORTED status needs to
1351 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1352 * received with the unsolicitied data out.
1353 */
1354 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1355 iscsit_stop_dataout_timer(cmd);
1356
1357 transport_check_aborted_status(se_cmd,
1358 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1359 return iscsit_dump_data_payload(conn, payload_length, 1);
1360 }
1361 } else {
1362 /*
1363 * For the normal solicited data path:
1364 *
1365 * Check for a delayed TASK_ABORTED status and dump any
1366 * incoming data out payload if one exists. Also, when the
1367 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1368 * data out sequence, we decrement outstanding_r2ts. Once
1369 * outstanding_r2ts reaches zero, go ahead and send the delayed
1370 * TASK_ABORTED status.
1371 */
1372 if (atomic_read(&se_cmd->t_transport_aborted) != 0) {
1373 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1374 if (--cmd->outstanding_r2ts < 1) {
1375 iscsit_stop_dataout_timer(cmd);
1376 transport_check_aborted_status(
1377 se_cmd, 1);
1378 }
1379
1380 return iscsit_dump_data_payload(conn, payload_length, 1);
1381 }
1382 }
1383 /*
1384 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1385 * within-command recovery checks before receiving the payload.
1386 */
1387 ret = iscsit_check_pre_dataout(cmd, buf);
1388 if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1389 return 0;
1390 else if (ret == DATAOUT_CANNOT_RECOVER)
1391 return -1;
1392
1393 rx_size += payload_length;
1394 iov = &cmd->iov_data[0];
1395
1396 iov_ret = iscsit_map_iovec(cmd, iov, hdr->offset, payload_length);
1397 if (iov_ret < 0)
1398 return -1;
1399
1400 iov_count += iov_ret;
1401
1402 padding = ((-payload_length) & 3);
1403 if (padding != 0) {
1404 iov[iov_count].iov_base = cmd->pad_bytes;
1405 iov[iov_count++].iov_len = padding;
1406 rx_size += padding;
1407 pr_debug("Receiving %u padding bytes.\n", padding);
1408 }
1409
1410 if (conn->conn_ops->DataDigest) {
1411 iov[iov_count].iov_base = &checksum;
1412 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1413 rx_size += ISCSI_CRC_LEN;
1414 }
1415
1416 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1417
1418 iscsit_unmap_iovec(cmd);
1419
1420 if (rx_got != rx_size)
1421 return -1;
1422
1423 if (conn->conn_ops->DataDigest) {
1424 u32 data_crc;
1425
1426 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1427 hdr->offset, payload_length, padding,
1428 cmd->pad_bytes);
1429
1430 if (checksum != data_crc) {
1431 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1432 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1433 " does not match computed 0x%08x\n",
1434 hdr->itt, hdr->offset, payload_length,
1435 hdr->datasn, checksum, data_crc);
1436 data_crc_failed = 1;
1437 } else {
1438 pr_debug("Got CRC32C DataDigest 0x%08x for"
1439 " %u bytes of Data Out\n", checksum,
1440 payload_length);
1441 }
1442 }
1443 /*
1444 * Increment post receive data and CRC values or perform
1445 * within-command recovery.
1446 */
1447 ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1448 if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1449 return 0;
1450 else if (ret == DATAOUT_SEND_R2T) {
1451 iscsit_set_dataout_sequence_values(cmd);
1452 iscsit_build_r2ts_for_cmd(cmd, conn, 0);
1453 } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1454 /*
1455 * Handle extra special case for out of order
1456 * Unsolicited Data Out.
1457 */
1458 spin_lock_bh(&cmd->istate_lock);
1459 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1460 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1461 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1462 spin_unlock_bh(&cmd->istate_lock);
1463
1464 iscsit_stop_dataout_timer(cmd);
1465 return (!ooo_cmdsn) ? transport_generic_handle_data(
1466 &cmd->se_cmd) : 0;
1467 } else /* DATAOUT_CANNOT_RECOVER */
1468 return -1;
1469
1470 return 0;
1471 }
1472
1473 static int iscsit_handle_nop_out(
1474 struct iscsi_conn *conn,
1475 unsigned char *buf)
1476 {
1477 unsigned char *ping_data = NULL;
1478 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1479 u32 checksum, data_crc, padding = 0, payload_length;
1480 u64 lun;
1481 struct iscsi_cmd *cmd = NULL;
1482 struct kvec *iov = NULL;
1483 struct iscsi_nopout *hdr;
1484
1485 hdr = (struct iscsi_nopout *) buf;
1486 payload_length = ntoh24(hdr->dlength);
1487 lun = get_unaligned_le64(&hdr->lun);
1488 hdr->itt = be32_to_cpu(hdr->itt);
1489 hdr->ttt = be32_to_cpu(hdr->ttt);
1490 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1491 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1492
1493 if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1494 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1495 " not set, protocol error.\n");
1496 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1497 buf, conn);
1498 }
1499
1500 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1501 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1502 " greater than MaxRecvDataSegmentLength: %u, protocol"
1503 " error.\n", payload_length,
1504 conn->conn_ops->MaxRecvDataSegmentLength);
1505 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1506 buf, conn);
1507 }
1508
1509 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1510 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1511 (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
1512 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1513 payload_length);
1514 /*
1515 * This is not a response to a Unsolicited NopIN, which means
1516 * it can either be a NOPOUT ping request (with a valid ITT),
1517 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1518 * Either way, make sure we allocate an struct iscsi_cmd, as both
1519 * can contain ping data.
1520 */
1521 if (hdr->ttt == 0xFFFFFFFF) {
1522 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1523 if (!cmd)
1524 return iscsit_add_reject(
1525 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1526 1, buf, conn);
1527
1528 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1529 cmd->i_state = ISTATE_SEND_NOPIN;
1530 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1531 1 : 0);
1532 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1533 cmd->targ_xfer_tag = 0xFFFFFFFF;
1534 cmd->cmd_sn = hdr->cmdsn;
1535 cmd->exp_stat_sn = hdr->exp_statsn;
1536 cmd->data_direction = DMA_NONE;
1537 }
1538
1539 if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
1540 rx_size = payload_length;
1541 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1542 if (!ping_data) {
1543 pr_err("Unable to allocate memory for"
1544 " NOPOUT ping data.\n");
1545 ret = -1;
1546 goto out;
1547 }
1548
1549 iov = &cmd->iov_misc[0];
1550 iov[niov].iov_base = ping_data;
1551 iov[niov++].iov_len = payload_length;
1552
1553 padding = ((-payload_length) & 3);
1554 if (padding != 0) {
1555 pr_debug("Receiving %u additional bytes"
1556 " for padding.\n", padding);
1557 iov[niov].iov_base = &cmd->pad_bytes;
1558 iov[niov++].iov_len = padding;
1559 rx_size += padding;
1560 }
1561 if (conn->conn_ops->DataDigest) {
1562 iov[niov].iov_base = &checksum;
1563 iov[niov++].iov_len = ISCSI_CRC_LEN;
1564 rx_size += ISCSI_CRC_LEN;
1565 }
1566
1567 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1568 if (rx_got != rx_size) {
1569 ret = -1;
1570 goto out;
1571 }
1572
1573 if (conn->conn_ops->DataDigest) {
1574 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1575 ping_data, payload_length,
1576 padding, cmd->pad_bytes,
1577 (u8 *)&data_crc);
1578
1579 if (checksum != data_crc) {
1580 pr_err("Ping data CRC32C DataDigest"
1581 " 0x%08x does not match computed 0x%08x\n",
1582 checksum, data_crc);
1583 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1584 pr_err("Unable to recover from"
1585 " NOPOUT Ping DataCRC failure while in"
1586 " ERL=0.\n");
1587 ret = -1;
1588 goto out;
1589 } else {
1590 /*
1591 * Silently drop this PDU and let the
1592 * initiator plug the CmdSN gap.
1593 */
1594 pr_debug("Dropping NOPOUT"
1595 " Command CmdSN: 0x%08x due to"
1596 " DataCRC error.\n", hdr->cmdsn);
1597 ret = 0;
1598 goto out;
1599 }
1600 } else {
1601 pr_debug("Got CRC32C DataDigest"
1602 " 0x%08x for %u bytes of ping data.\n",
1603 checksum, payload_length);
1604 }
1605 }
1606
1607 ping_data[payload_length] = '\0';
1608 /*
1609 * Attach ping data to struct iscsi_cmd->buf_ptr.
1610 */
1611 cmd->buf_ptr = (void *)ping_data;
1612 cmd->buf_ptr_size = payload_length;
1613
1614 pr_debug("Got %u bytes of NOPOUT ping"
1615 " data.\n", payload_length);
1616 pr_debug("Ping Data: \"%s\"\n", ping_data);
1617 }
1618
1619 if (hdr->itt != 0xFFFFFFFF) {
1620 if (!cmd) {
1621 pr_err("Checking CmdSN for NOPOUT,"
1622 " but cmd is NULL!\n");
1623 return -1;
1624 }
1625 /*
1626 * Initiator is expecting a NopIN ping reply,
1627 */
1628 spin_lock_bh(&conn->cmd_lock);
1629 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1630 spin_unlock_bh(&conn->cmd_lock);
1631
1632 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1633
1634 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1635 iscsit_add_cmd_to_response_queue(cmd, conn,
1636 cmd->i_state);
1637 return 0;
1638 }
1639
1640 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1641 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1642 ret = 0;
1643 goto ping_out;
1644 }
1645 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1646 return iscsit_add_reject_from_cmd(
1647 ISCSI_REASON_PROTOCOL_ERROR,
1648 1, 0, buf, cmd);
1649
1650 return 0;
1651 }
1652
1653 if (hdr->ttt != 0xFFFFFFFF) {
1654 /*
1655 * This was a response to a unsolicited NOPIN ping.
1656 */
1657 cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
1658 if (!cmd)
1659 return -1;
1660
1661 iscsit_stop_nopin_response_timer(conn);
1662
1663 cmd->i_state = ISTATE_REMOVE;
1664 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1665 iscsit_start_nopin_timer(conn);
1666 } else {
1667 /*
1668 * Initiator is not expecting a NOPIN is response.
1669 * Just ignore for now.
1670 *
1671 * iSCSI v19-91 10.18
1672 * "A NOP-OUT may also be used to confirm a changed
1673 * ExpStatSN if another PDU will not be available
1674 * for a long time."
1675 */
1676 ret = 0;
1677 goto out;
1678 }
1679
1680 return 0;
1681 out:
1682 if (cmd)
1683 iscsit_release_cmd(cmd);
1684 ping_out:
1685 kfree(ping_data);
1686 return ret;
1687 }
1688
1689 static int iscsit_handle_task_mgt_cmd(
1690 struct iscsi_conn *conn,
1691 unsigned char *buf)
1692 {
1693 struct iscsi_cmd *cmd;
1694 struct se_tmr_req *se_tmr;
1695 struct iscsi_tmr_req *tmr_req;
1696 struct iscsi_tm *hdr;
1697 u32 payload_length;
1698 int out_of_order_cmdsn = 0;
1699 int ret;
1700 u8 function;
1701
1702 hdr = (struct iscsi_tm *) buf;
1703 payload_length = ntoh24(hdr->dlength);
1704 hdr->itt = be32_to_cpu(hdr->itt);
1705 hdr->rtt = be32_to_cpu(hdr->rtt);
1706 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1707 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1708 hdr->refcmdsn = be32_to_cpu(hdr->refcmdsn);
1709 hdr->exp_datasn = be32_to_cpu(hdr->exp_datasn);
1710 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1711 function = hdr->flags;
1712
1713 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1714 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1715 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1716 hdr->rtt, hdr->refcmdsn, conn->cid);
1717
1718 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1719 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1720 (hdr->rtt != ISCSI_RESERVED_TAG))) {
1721 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1722 hdr->rtt = ISCSI_RESERVED_TAG;
1723 }
1724
1725 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1726 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1727 pr_err("Task Management Request TASK_REASSIGN not"
1728 " issued as immediate command, bad iSCSI Initiator"
1729 "implementation\n");
1730 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1731 buf, conn);
1732 }
1733 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1734 (hdr->refcmdsn != ISCSI_RESERVED_TAG))
1735 hdr->refcmdsn = ISCSI_RESERVED_TAG;
1736
1737 cmd = iscsit_allocate_se_cmd_for_tmr(conn, function);
1738 if (!cmd)
1739 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1740 1, buf, conn);
1741
1742 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1743 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1744 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1745 cmd->init_task_tag = hdr->itt;
1746 cmd->targ_xfer_tag = 0xFFFFFFFF;
1747 cmd->cmd_sn = hdr->cmdsn;
1748 cmd->exp_stat_sn = hdr->exp_statsn;
1749 se_tmr = cmd->se_cmd.se_tmr_req;
1750 tmr_req = cmd->tmr_req;
1751 /*
1752 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1753 */
1754 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1755 ret = iscsit_get_lun_for_tmr(cmd,
1756 get_unaligned_le64(&hdr->lun));
1757 if (ret < 0) {
1758 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1759 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1760 goto attach;
1761 }
1762 }
1763
1764 switch (function) {
1765 case ISCSI_TM_FUNC_ABORT_TASK:
1766 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1767 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1768 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1769 goto attach;
1770 }
1771 break;
1772 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1773 case ISCSI_TM_FUNC_CLEAR_ACA:
1774 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1775 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1776 break;
1777 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1778 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1779 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1780 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1781 goto attach;
1782 }
1783 break;
1784 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1785 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1786 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1787 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1788 goto attach;
1789 }
1790 break;
1791 case ISCSI_TM_FUNC_TASK_REASSIGN:
1792 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1793 /*
1794 * Perform sanity checks on the ExpDataSN only if the
1795 * TASK_REASSIGN was successful.
1796 */
1797 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1798 break;
1799
1800 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1801 return iscsit_add_reject_from_cmd(
1802 ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1803 buf, cmd);
1804 break;
1805 default:
1806 pr_err("Unknown TMR function: 0x%02x, protocol"
1807 " error.\n", function);
1808 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1809 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1810 goto attach;
1811 }
1812
1813 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1814 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1815 se_tmr->call_transport = 1;
1816 attach:
1817 spin_lock_bh(&conn->cmd_lock);
1818 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1819 spin_unlock_bh(&conn->cmd_lock);
1820
1821 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1822 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1823 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1824 out_of_order_cmdsn = 1;
1825 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1826 return 0;
1827 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1828 return iscsit_add_reject_from_cmd(
1829 ISCSI_REASON_PROTOCOL_ERROR,
1830 1, 0, buf, cmd);
1831 }
1832 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1833
1834 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1835 return 0;
1836 /*
1837 * Found the referenced task, send to transport for processing.
1838 */
1839 if (se_tmr->call_transport)
1840 return transport_generic_handle_tmr(&cmd->se_cmd);
1841
1842 /*
1843 * Could not find the referenced LUN, task, or Task Management
1844 * command not authorized or supported. Change state and
1845 * let the tx_thread send the response.
1846 *
1847 * For connection recovery, this is also the default action for
1848 * TMR TASK_REASSIGN.
1849 */
1850 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1851 return 0;
1852 }
1853
1854 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1855 static int iscsit_handle_text_cmd(
1856 struct iscsi_conn *conn,
1857 unsigned char *buf)
1858 {
1859 char *text_ptr, *text_in;
1860 int cmdsn_ret, niov = 0, rx_got, rx_size;
1861 u32 checksum = 0, data_crc = 0, payload_length;
1862 u32 padding = 0, pad_bytes = 0, text_length = 0;
1863 struct iscsi_cmd *cmd;
1864 struct kvec iov[3];
1865 struct iscsi_text *hdr;
1866
1867 hdr = (struct iscsi_text *) buf;
1868 payload_length = ntoh24(hdr->dlength);
1869 hdr->itt = be32_to_cpu(hdr->itt);
1870 hdr->ttt = be32_to_cpu(hdr->ttt);
1871 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1872 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1873
1874 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1875 pr_err("Unable to accept text parameter length: %u"
1876 "greater than MaxRecvDataSegmentLength %u.\n",
1877 payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
1878 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1879 buf, conn);
1880 }
1881
1882 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1883 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1884 hdr->exp_statsn, payload_length);
1885
1886 rx_size = text_length = payload_length;
1887 if (text_length) {
1888 text_in = kzalloc(text_length, GFP_KERNEL);
1889 if (!text_in) {
1890 pr_err("Unable to allocate memory for"
1891 " incoming text parameters\n");
1892 return -1;
1893 }
1894
1895 memset(iov, 0, 3 * sizeof(struct kvec));
1896 iov[niov].iov_base = text_in;
1897 iov[niov++].iov_len = text_length;
1898
1899 padding = ((-payload_length) & 3);
1900 if (padding != 0) {
1901 iov[niov].iov_base = &pad_bytes;
1902 iov[niov++].iov_len = padding;
1903 rx_size += padding;
1904 pr_debug("Receiving %u additional bytes"
1905 " for padding.\n", padding);
1906 }
1907 if (conn->conn_ops->DataDigest) {
1908 iov[niov].iov_base = &checksum;
1909 iov[niov++].iov_len = ISCSI_CRC_LEN;
1910 rx_size += ISCSI_CRC_LEN;
1911 }
1912
1913 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1914 if (rx_got != rx_size) {
1915 kfree(text_in);
1916 return -1;
1917 }
1918
1919 if (conn->conn_ops->DataDigest) {
1920 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1921 text_in, text_length,
1922 padding, (u8 *)&pad_bytes,
1923 (u8 *)&data_crc);
1924
1925 if (checksum != data_crc) {
1926 pr_err("Text data CRC32C DataDigest"
1927 " 0x%08x does not match computed"
1928 " 0x%08x\n", checksum, data_crc);
1929 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1930 pr_err("Unable to recover from"
1931 " Text Data digest failure while in"
1932 " ERL=0.\n");
1933 kfree(text_in);
1934 return -1;
1935 } else {
1936 /*
1937 * Silently drop this PDU and let the
1938 * initiator plug the CmdSN gap.
1939 */
1940 pr_debug("Dropping Text"
1941 " Command CmdSN: 0x%08x due to"
1942 " DataCRC error.\n", hdr->cmdsn);
1943 kfree(text_in);
1944 return 0;
1945 }
1946 } else {
1947 pr_debug("Got CRC32C DataDigest"
1948 " 0x%08x for %u bytes of text data.\n",
1949 checksum, text_length);
1950 }
1951 }
1952 text_in[text_length - 1] = '\0';
1953 pr_debug("Successfully read %d bytes of text"
1954 " data.\n", text_length);
1955
1956 if (strncmp("SendTargets", text_in, 11) != 0) {
1957 pr_err("Received Text Data that is not"
1958 " SendTargets, cannot continue.\n");
1959 kfree(text_in);
1960 return -1;
1961 }
1962 text_ptr = strchr(text_in, '=');
1963 if (!text_ptr) {
1964 pr_err("No \"=\" separator found in Text Data,"
1965 " cannot continue.\n");
1966 kfree(text_in);
1967 return -1;
1968 }
1969 if (strncmp("=All", text_ptr, 4) != 0) {
1970 pr_err("Unable to locate All value for"
1971 " SendTargets key, cannot continue.\n");
1972 kfree(text_in);
1973 return -1;
1974 }
1975 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1976 kfree(text_in);
1977 }
1978
1979 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1980 if (!cmd)
1981 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1982 1, buf, conn);
1983
1984 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1985 cmd->i_state = ISTATE_SEND_TEXTRSP;
1986 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1987 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1988 cmd->targ_xfer_tag = 0xFFFFFFFF;
1989 cmd->cmd_sn = hdr->cmdsn;
1990 cmd->exp_stat_sn = hdr->exp_statsn;
1991 cmd->data_direction = DMA_NONE;
1992
1993 spin_lock_bh(&conn->cmd_lock);
1994 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1995 spin_unlock_bh(&conn->cmd_lock);
1996
1997 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1998
1999 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2000 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2001 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2002 return iscsit_add_reject_from_cmd(
2003 ISCSI_REASON_PROTOCOL_ERROR,
2004 1, 0, buf, cmd);
2005
2006 return 0;
2007 }
2008
2009 return iscsit_execute_cmd(cmd, 0);
2010 }
2011
2012 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2013 {
2014 struct iscsi_conn *conn_p;
2015 struct iscsi_session *sess = conn->sess;
2016
2017 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2018 " for SID: %u.\n", conn->cid, conn->sess->sid);
2019
2020 atomic_set(&sess->session_logout, 1);
2021 atomic_set(&conn->conn_logout_remove, 1);
2022 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2023
2024 iscsit_inc_conn_usage_count(conn);
2025 iscsit_inc_session_usage_count(sess);
2026
2027 spin_lock_bh(&sess->conn_lock);
2028 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2029 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2030 continue;
2031
2032 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2033 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2034 }
2035 spin_unlock_bh(&sess->conn_lock);
2036
2037 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2038
2039 return 0;
2040 }
2041
2042 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2043 {
2044 struct iscsi_conn *l_conn;
2045 struct iscsi_session *sess = conn->sess;
2046
2047 pr_debug("Received logout request CLOSECONNECTION for CID:"
2048 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2049
2050 /*
2051 * A Logout Request with a CLOSECONNECTION reason code for a CID
2052 * can arrive on a connection with a differing CID.
2053 */
2054 if (conn->cid == cmd->logout_cid) {
2055 spin_lock_bh(&conn->state_lock);
2056 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2057 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2058
2059 atomic_set(&conn->conn_logout_remove, 1);
2060 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2061 iscsit_inc_conn_usage_count(conn);
2062
2063 spin_unlock_bh(&conn->state_lock);
2064 } else {
2065 /*
2066 * Handle all different cid CLOSECONNECTION requests in
2067 * iscsit_logout_post_handler_diffcid() as to give enough
2068 * time for any non immediate command's CmdSN to be
2069 * acknowledged on the connection in question.
2070 *
2071 * Here we simply make sure the CID is still around.
2072 */
2073 l_conn = iscsit_get_conn_from_cid(sess,
2074 cmd->logout_cid);
2075 if (!l_conn) {
2076 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2077 iscsit_add_cmd_to_response_queue(cmd, conn,
2078 cmd->i_state);
2079 return 0;
2080 }
2081
2082 iscsit_dec_conn_usage_count(l_conn);
2083 }
2084
2085 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2086
2087 return 0;
2088 }
2089
2090 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2091 {
2092 struct iscsi_session *sess = conn->sess;
2093
2094 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2095 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2096
2097 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2098 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2099 " while ERL!=2.\n");
2100 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2101 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2102 return 0;
2103 }
2104
2105 if (conn->cid == cmd->logout_cid) {
2106 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2107 " with CID: %hu on CID: %hu, implementation error.\n",
2108 cmd->logout_cid, conn->cid);
2109 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2110 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2111 return 0;
2112 }
2113
2114 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2115
2116 return 0;
2117 }
2118
2119 static int iscsit_handle_logout_cmd(
2120 struct iscsi_conn *conn,
2121 unsigned char *buf)
2122 {
2123 int cmdsn_ret, logout_remove = 0;
2124 u8 reason_code = 0;
2125 struct iscsi_cmd *cmd;
2126 struct iscsi_logout *hdr;
2127 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2128
2129 hdr = (struct iscsi_logout *) buf;
2130 reason_code = (hdr->flags & 0x7f);
2131 hdr->itt = be32_to_cpu(hdr->itt);
2132 hdr->cid = be16_to_cpu(hdr->cid);
2133 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
2134 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2135
2136 if (tiqn) {
2137 spin_lock(&tiqn->logout_stats.lock);
2138 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2139 tiqn->logout_stats.normal_logouts++;
2140 else
2141 tiqn->logout_stats.abnormal_logouts++;
2142 spin_unlock(&tiqn->logout_stats.lock);
2143 }
2144
2145 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2146 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2147 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2148 hdr->cid, conn->cid);
2149
2150 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2151 pr_err("Received logout request on connection that"
2152 " is not in logged in state, ignoring request.\n");
2153 return 0;
2154 }
2155
2156 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2157 if (!cmd)
2158 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2159 buf, conn);
2160
2161 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2162 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2163 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2164 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2165 cmd->targ_xfer_tag = 0xFFFFFFFF;
2166 cmd->cmd_sn = hdr->cmdsn;
2167 cmd->exp_stat_sn = hdr->exp_statsn;
2168 cmd->logout_cid = hdr->cid;
2169 cmd->logout_reason = reason_code;
2170 cmd->data_direction = DMA_NONE;
2171
2172 /*
2173 * We need to sleep in these cases (by returning 1) until the Logout
2174 * Response gets sent in the tx thread.
2175 */
2176 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2177 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2178 (hdr->cid == conn->cid)))
2179 logout_remove = 1;
2180
2181 spin_lock_bh(&conn->cmd_lock);
2182 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
2183 spin_unlock_bh(&conn->cmd_lock);
2184
2185 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2186 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2187
2188 /*
2189 * Immediate commands are executed, well, immediately.
2190 * Non-Immediate Logout Commands are executed in CmdSN order.
2191 */
2192 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
2193 int ret = iscsit_execute_cmd(cmd, 0);
2194
2195 if (ret < 0)
2196 return ret;
2197 } else {
2198 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2199 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2200 logout_remove = 0;
2201 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2202 return iscsit_add_reject_from_cmd(
2203 ISCSI_REASON_PROTOCOL_ERROR,
2204 1, 0, buf, cmd);
2205 }
2206 }
2207
2208 return logout_remove;
2209 }
2210
2211 static int iscsit_handle_snack(
2212 struct iscsi_conn *conn,
2213 unsigned char *buf)
2214 {
2215 u32 unpacked_lun;
2216 u64 lun;
2217 struct iscsi_snack *hdr;
2218
2219 hdr = (struct iscsi_snack *) buf;
2220 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2221 lun = get_unaligned_le64(&hdr->lun);
2222 unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
2223 hdr->itt = be32_to_cpu(hdr->itt);
2224 hdr->ttt = be32_to_cpu(hdr->ttt);
2225 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2226 hdr->begrun = be32_to_cpu(hdr->begrun);
2227 hdr->runlength = be32_to_cpu(hdr->runlength);
2228
2229 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2230 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2231 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2232 hdr->begrun, hdr->runlength, conn->cid);
2233
2234 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2235 pr_err("Initiator sent SNACK request while in"
2236 " ErrorRecoveryLevel=0.\n");
2237 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2238 buf, conn);
2239 }
2240 /*
2241 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2242 * call from inside iscsi_send_recovery_datain_or_r2t().
2243 */
2244 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2245 case 0:
2246 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2247 hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
2248 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2249 return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
2250 hdr->begrun, hdr->runlength);
2251 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2252 return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
2253 hdr->runlength);
2254 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2255 /* FIXME: Support R-Data SNACK */
2256 pr_err("R-Data SNACK Not Supported.\n");
2257 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2258 buf, conn);
2259 default:
2260 pr_err("Unknown SNACK type 0x%02x, protocol"
2261 " error.\n", hdr->flags & 0x0f);
2262 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2263 buf, conn);
2264 }
2265
2266 return 0;
2267 }
2268
2269 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2270 {
2271 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2272 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2273 wait_for_completion_interruptible_timeout(
2274 &conn->rx_half_close_comp,
2275 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2276 }
2277 }
2278
2279 static int iscsit_handle_immediate_data(
2280 struct iscsi_cmd *cmd,
2281 unsigned char *buf,
2282 u32 length)
2283 {
2284 int iov_ret, rx_got = 0, rx_size = 0;
2285 u32 checksum, iov_count = 0, padding = 0;
2286 struct iscsi_conn *conn = cmd->conn;
2287 struct kvec *iov;
2288
2289 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2290 if (iov_ret < 0)
2291 return IMMEDIATE_DATA_CANNOT_RECOVER;
2292
2293 rx_size = length;
2294 iov_count = iov_ret;
2295 iov = &cmd->iov_data[0];
2296
2297 padding = ((-length) & 3);
2298 if (padding != 0) {
2299 iov[iov_count].iov_base = cmd->pad_bytes;
2300 iov[iov_count++].iov_len = padding;
2301 rx_size += padding;
2302 }
2303
2304 if (conn->conn_ops->DataDigest) {
2305 iov[iov_count].iov_base = &checksum;
2306 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2307 rx_size += ISCSI_CRC_LEN;
2308 }
2309
2310 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2311
2312 iscsit_unmap_iovec(cmd);
2313
2314 if (rx_got != rx_size) {
2315 iscsit_rx_thread_wait_for_tcp(conn);
2316 return IMMEDIATE_DATA_CANNOT_RECOVER;
2317 }
2318
2319 if (conn->conn_ops->DataDigest) {
2320 u32 data_crc;
2321
2322 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2323 cmd->write_data_done, length, padding,
2324 cmd->pad_bytes);
2325
2326 if (checksum != data_crc) {
2327 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2328 " does not match computed 0x%08x\n", checksum,
2329 data_crc);
2330
2331 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2332 pr_err("Unable to recover from"
2333 " Immediate Data digest failure while"
2334 " in ERL=0.\n");
2335 iscsit_add_reject_from_cmd(
2336 ISCSI_REASON_DATA_DIGEST_ERROR,
2337 1, 0, buf, cmd);
2338 return IMMEDIATE_DATA_CANNOT_RECOVER;
2339 } else {
2340 iscsit_add_reject_from_cmd(
2341 ISCSI_REASON_DATA_DIGEST_ERROR,
2342 0, 0, buf, cmd);
2343 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2344 }
2345 } else {
2346 pr_debug("Got CRC32C DataDigest 0x%08x for"
2347 " %u bytes of Immediate Data\n", checksum,
2348 length);
2349 }
2350 }
2351
2352 cmd->write_data_done += length;
2353
2354 if (cmd->write_data_done == cmd->data_length) {
2355 spin_lock_bh(&cmd->istate_lock);
2356 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2357 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2358 spin_unlock_bh(&cmd->istate_lock);
2359 }
2360
2361 return IMMEDIATE_DATA_NORMAL_OPERATION;
2362 }
2363
2364 /*
2365 * Called with sess->conn_lock held.
2366 */
2367 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2368 with active network interface */
2369 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2370 {
2371 struct iscsi_cmd *cmd;
2372 struct iscsi_conn *conn_p;
2373
2374 /*
2375 * Only send a Asynchronous Message on connections whos network
2376 * interface is still functional.
2377 */
2378 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2379 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2380 iscsit_inc_conn_usage_count(conn_p);
2381 break;
2382 }
2383 }
2384
2385 if (!conn_p)
2386 return;
2387
2388 cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
2389 if (!cmd) {
2390 iscsit_dec_conn_usage_count(conn_p);
2391 return;
2392 }
2393
2394 cmd->logout_cid = conn->cid;
2395 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2396 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2397
2398 spin_lock_bh(&conn_p->cmd_lock);
2399 list_add_tail(&cmd->i_list, &conn_p->conn_cmd_list);
2400 spin_unlock_bh(&conn_p->cmd_lock);
2401
2402 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2403 iscsit_dec_conn_usage_count(conn_p);
2404 }
2405
2406 static int iscsit_send_conn_drop_async_message(
2407 struct iscsi_cmd *cmd,
2408 struct iscsi_conn *conn)
2409 {
2410 struct iscsi_async *hdr;
2411
2412 cmd->tx_size = ISCSI_HDR_LEN;
2413 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2414
2415 hdr = (struct iscsi_async *) cmd->pdu;
2416 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2417 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2418 cmd->init_task_tag = 0xFFFFFFFF;
2419 cmd->targ_xfer_tag = 0xFFFFFFFF;
2420 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2421 cmd->stat_sn = conn->stat_sn++;
2422 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2423 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2424 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2425 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2426 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2427 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2428 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2429
2430 if (conn->conn_ops->HeaderDigest) {
2431 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2432
2433 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2434 (unsigned char *)hdr, ISCSI_HDR_LEN,
2435 0, NULL, (u8 *)header_digest);
2436
2437 cmd->tx_size += ISCSI_CRC_LEN;
2438 pr_debug("Attaching CRC32C HeaderDigest to"
2439 " Async Message 0x%08x\n", *header_digest);
2440 }
2441
2442 cmd->iov_misc[0].iov_base = cmd->pdu;
2443 cmd->iov_misc[0].iov_len = cmd->tx_size;
2444 cmd->iov_misc_count = 1;
2445
2446 pr_debug("Sending Connection Dropped Async Message StatSN:"
2447 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2448 cmd->logout_cid, conn->cid);
2449 return 0;
2450 }
2451
2452 static int iscsit_send_data_in(
2453 struct iscsi_cmd *cmd,
2454 struct iscsi_conn *conn,
2455 int *eodr)
2456 {
2457 int iov_ret = 0, set_statsn = 0;
2458 u32 iov_count = 0, tx_size = 0;
2459 struct iscsi_datain datain;
2460 struct iscsi_datain_req *dr;
2461 struct iscsi_data_rsp *hdr;
2462 struct kvec *iov;
2463
2464 memset(&datain, 0, sizeof(struct iscsi_datain));
2465 dr = iscsit_get_datain_values(cmd, &datain);
2466 if (!dr) {
2467 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2468 cmd->init_task_tag);
2469 return -1;
2470 }
2471
2472 /*
2473 * Be paranoid and double check the logic for now.
2474 */
2475 if ((datain.offset + datain.length) > cmd->data_length) {
2476 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2477 " datain.length: %u exceeds cmd->data_length: %u\n",
2478 cmd->init_task_tag, datain.offset, datain.length,
2479 cmd->data_length);
2480 return -1;
2481 }
2482
2483 spin_lock_bh(&conn->sess->session_stats_lock);
2484 conn->sess->tx_data_octets += datain.length;
2485 if (conn->sess->se_sess->se_node_acl) {
2486 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2487 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2488 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2489 }
2490 spin_unlock_bh(&conn->sess->session_stats_lock);
2491 /*
2492 * Special case for successfully execution w/ both DATAIN
2493 * and Sense Data.
2494 */
2495 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2496 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2497 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2498 else {
2499 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2500 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2501 iscsit_increment_maxcmdsn(cmd, conn->sess);
2502 cmd->stat_sn = conn->stat_sn++;
2503 set_statsn = 1;
2504 } else if (dr->dr_complete ==
2505 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2506 set_statsn = 1;
2507 }
2508
2509 hdr = (struct iscsi_data_rsp *) cmd->pdu;
2510 memset(hdr, 0, ISCSI_HDR_LEN);
2511 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2512 hdr->flags = datain.flags;
2513 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2514 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2515 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2516 hdr->residual_count = cpu_to_be32(cmd->residual_count);
2517 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2518 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2519 hdr->residual_count = cpu_to_be32(cmd->residual_count);
2520 }
2521 }
2522 hton24(hdr->dlength, datain.length);
2523 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2524 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2525 (struct scsi_lun *)&hdr->lun);
2526 else
2527 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2528
2529 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2530 hdr->ttt = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
2531 cpu_to_be32(cmd->targ_xfer_tag) :
2532 0xFFFFFFFF;
2533 hdr->statsn = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
2534 0xFFFFFFFF;
2535 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2536 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2537 hdr->datasn = cpu_to_be32(datain.data_sn);
2538 hdr->offset = cpu_to_be32(datain.offset);
2539
2540 iov = &cmd->iov_data[0];
2541 iov[iov_count].iov_base = cmd->pdu;
2542 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2543 tx_size += ISCSI_HDR_LEN;
2544
2545 if (conn->conn_ops->HeaderDigest) {
2546 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2547
2548 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2549 (unsigned char *)hdr, ISCSI_HDR_LEN,
2550 0, NULL, (u8 *)header_digest);
2551
2552 iov[0].iov_len += ISCSI_CRC_LEN;
2553 tx_size += ISCSI_CRC_LEN;
2554
2555 pr_debug("Attaching CRC32 HeaderDigest"
2556 " for DataIN PDU 0x%08x\n", *header_digest);
2557 }
2558
2559 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2560 if (iov_ret < 0)
2561 return -1;
2562
2563 iov_count += iov_ret;
2564 tx_size += datain.length;
2565
2566 cmd->padding = ((-datain.length) & 3);
2567 if (cmd->padding) {
2568 iov[iov_count].iov_base = cmd->pad_bytes;
2569 iov[iov_count++].iov_len = cmd->padding;
2570 tx_size += cmd->padding;
2571
2572 pr_debug("Attaching %u padding bytes\n",
2573 cmd->padding);
2574 }
2575 if (conn->conn_ops->DataDigest) {
2576 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2577 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2578
2579 iov[iov_count].iov_base = &cmd->data_crc;
2580 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2581 tx_size += ISCSI_CRC_LEN;
2582
2583 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2584 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2585 }
2586
2587 cmd->iov_data_count = iov_count;
2588 cmd->tx_size = tx_size;
2589
2590 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2591 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2592 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2593 ntohl(hdr->offset), datain.length, conn->cid);
2594
2595 if (dr->dr_complete) {
2596 *eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2597 2 : 1;
2598 iscsit_free_datain_req(cmd, dr);
2599 }
2600
2601 return 0;
2602 }
2603
2604 static int iscsit_send_logout_response(
2605 struct iscsi_cmd *cmd,
2606 struct iscsi_conn *conn)
2607 {
2608 int niov = 0, tx_size;
2609 struct iscsi_conn *logout_conn = NULL;
2610 struct iscsi_conn_recovery *cr = NULL;
2611 struct iscsi_session *sess = conn->sess;
2612 struct kvec *iov;
2613 struct iscsi_logout_rsp *hdr;
2614 /*
2615 * The actual shutting down of Sessions and/or Connections
2616 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2617 * is done in scsi_logout_post_handler().
2618 */
2619 switch (cmd->logout_reason) {
2620 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2621 pr_debug("iSCSI session logout successful, setting"
2622 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2623 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2624 break;
2625 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2626 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2627 break;
2628 /*
2629 * For CLOSECONNECTION logout requests carrying
2630 * a matching logout CID -> local CID, the reference
2631 * for the local CID will have been incremented in
2632 * iscsi_logout_closeconnection().
2633 *
2634 * For CLOSECONNECTION logout requests carrying
2635 * a different CID than the connection it arrived
2636 * on, the connection responding to cmd->logout_cid
2637 * is stopped in iscsit_logout_post_handler_diffcid().
2638 */
2639
2640 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2641 " successful.\n", cmd->logout_cid, conn->cid);
2642 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2643 break;
2644 case ISCSI_LOGOUT_REASON_RECOVERY:
2645 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2646 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2647 break;
2648 /*
2649 * If the connection is still active from our point of view
2650 * force connection recovery to occur.
2651 */
2652 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2653 cmd->logout_cid);
2654 if ((logout_conn)) {
2655 iscsit_connection_reinstatement_rcfr(logout_conn);
2656 iscsit_dec_conn_usage_count(logout_conn);
2657 }
2658
2659 cr = iscsit_get_inactive_connection_recovery_entry(
2660 conn->sess, cmd->logout_cid);
2661 if (!cr) {
2662 pr_err("Unable to locate CID: %hu for"
2663 " REMOVECONNFORRECOVERY Logout Request.\n",
2664 cmd->logout_cid);
2665 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2666 break;
2667 }
2668
2669 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2670
2671 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2672 " for recovery for CID: %hu on CID: %hu successful.\n",
2673 cmd->logout_cid, conn->cid);
2674 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2675 break;
2676 default:
2677 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2678 cmd->logout_reason);
2679 return -1;
2680 }
2681
2682 tx_size = ISCSI_HDR_LEN;
2683 hdr = (struct iscsi_logout_rsp *)cmd->pdu;
2684 memset(hdr, 0, ISCSI_HDR_LEN);
2685 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2686 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2687 hdr->response = cmd->logout_response;
2688 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2689 cmd->stat_sn = conn->stat_sn++;
2690 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2691
2692 iscsit_increment_maxcmdsn(cmd, conn->sess);
2693 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2694 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2695
2696 iov = &cmd->iov_misc[0];
2697 iov[niov].iov_base = cmd->pdu;
2698 iov[niov++].iov_len = ISCSI_HDR_LEN;
2699
2700 if (conn->conn_ops->HeaderDigest) {
2701 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2702
2703 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2704 (unsigned char *)hdr, ISCSI_HDR_LEN,
2705 0, NULL, (u8 *)header_digest);
2706
2707 iov[0].iov_len += ISCSI_CRC_LEN;
2708 tx_size += ISCSI_CRC_LEN;
2709 pr_debug("Attaching CRC32C HeaderDigest to"
2710 " Logout Response 0x%08x\n", *header_digest);
2711 }
2712 cmd->iov_misc_count = niov;
2713 cmd->tx_size = tx_size;
2714
2715 pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2716 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2717 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2718 cmd->logout_cid, conn->cid);
2719
2720 return 0;
2721 }
2722
2723 /*
2724 * Unsolicited NOPIN, either requesting a response or not.
2725 */
2726 static int iscsit_send_unsolicited_nopin(
2727 struct iscsi_cmd *cmd,
2728 struct iscsi_conn *conn,
2729 int want_response)
2730 {
2731 int tx_size = ISCSI_HDR_LEN;
2732 struct iscsi_nopin *hdr;
2733
2734 hdr = (struct iscsi_nopin *) cmd->pdu;
2735 memset(hdr, 0, ISCSI_HDR_LEN);
2736 hdr->opcode = ISCSI_OP_NOOP_IN;
2737 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2738 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2739 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2740 cmd->stat_sn = conn->stat_sn;
2741 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2742 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2743 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2744
2745 if (conn->conn_ops->HeaderDigest) {
2746 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2747
2748 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2749 (unsigned char *)hdr, ISCSI_HDR_LEN,
2750 0, NULL, (u8 *)header_digest);
2751
2752 tx_size += ISCSI_CRC_LEN;
2753 pr_debug("Attaching CRC32C HeaderDigest to"
2754 " NopIN 0x%08x\n", *header_digest);
2755 }
2756
2757 cmd->iov_misc[0].iov_base = cmd->pdu;
2758 cmd->iov_misc[0].iov_len = tx_size;
2759 cmd->iov_misc_count = 1;
2760 cmd->tx_size = tx_size;
2761
2762 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2763 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2764
2765 return 0;
2766 }
2767
2768 static int iscsit_send_nopin_response(
2769 struct iscsi_cmd *cmd,
2770 struct iscsi_conn *conn)
2771 {
2772 int niov = 0, tx_size;
2773 u32 padding = 0;
2774 struct kvec *iov;
2775 struct iscsi_nopin *hdr;
2776
2777 tx_size = ISCSI_HDR_LEN;
2778 hdr = (struct iscsi_nopin *) cmd->pdu;
2779 memset(hdr, 0, ISCSI_HDR_LEN);
2780 hdr->opcode = ISCSI_OP_NOOP_IN;
2781 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2782 hton24(hdr->dlength, cmd->buf_ptr_size);
2783 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2784 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2785 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2786 cmd->stat_sn = conn->stat_sn++;
2787 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2788
2789 iscsit_increment_maxcmdsn(cmd, conn->sess);
2790 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2791 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2792
2793 iov = &cmd->iov_misc[0];
2794 iov[niov].iov_base = cmd->pdu;
2795 iov[niov++].iov_len = ISCSI_HDR_LEN;
2796
2797 if (conn->conn_ops->HeaderDigest) {
2798 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2799
2800 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2801 (unsigned char *)hdr, ISCSI_HDR_LEN,
2802 0, NULL, (u8 *)header_digest);
2803
2804 iov[0].iov_len += ISCSI_CRC_LEN;
2805 tx_size += ISCSI_CRC_LEN;
2806 pr_debug("Attaching CRC32C HeaderDigest"
2807 " to NopIn 0x%08x\n", *header_digest);
2808 }
2809
2810 /*
2811 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2812 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2813 */
2814 if (cmd->buf_ptr_size) {
2815 iov[niov].iov_base = cmd->buf_ptr;
2816 iov[niov++].iov_len = cmd->buf_ptr_size;
2817 tx_size += cmd->buf_ptr_size;
2818
2819 pr_debug("Echoing back %u bytes of ping"
2820 " data.\n", cmd->buf_ptr_size);
2821
2822 padding = ((-cmd->buf_ptr_size) & 3);
2823 if (padding != 0) {
2824 iov[niov].iov_base = &cmd->pad_bytes;
2825 iov[niov++].iov_len = padding;
2826 tx_size += padding;
2827 pr_debug("Attaching %u additional"
2828 " padding bytes.\n", padding);
2829 }
2830 if (conn->conn_ops->DataDigest) {
2831 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2832 cmd->buf_ptr, cmd->buf_ptr_size,
2833 padding, (u8 *)&cmd->pad_bytes,
2834 (u8 *)&cmd->data_crc);
2835
2836 iov[niov].iov_base = &cmd->data_crc;
2837 iov[niov++].iov_len = ISCSI_CRC_LEN;
2838 tx_size += ISCSI_CRC_LEN;
2839 pr_debug("Attached DataDigest for %u"
2840 " bytes of ping data, CRC 0x%08x\n",
2841 cmd->buf_ptr_size, cmd->data_crc);
2842 }
2843 }
2844
2845 cmd->iov_misc_count = niov;
2846 cmd->tx_size = tx_size;
2847
2848 pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2849 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2850 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2851
2852 return 0;
2853 }
2854
2855 int iscsit_send_r2t(
2856 struct iscsi_cmd *cmd,
2857 struct iscsi_conn *conn)
2858 {
2859 int tx_size = 0;
2860 struct iscsi_r2t *r2t;
2861 struct iscsi_r2t_rsp *hdr;
2862
2863 r2t = iscsit_get_r2t_from_list(cmd);
2864 if (!r2t)
2865 return -1;
2866
2867 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
2868 memset(hdr, 0, ISCSI_HDR_LEN);
2869 hdr->opcode = ISCSI_OP_R2T;
2870 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2871 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2872 (struct scsi_lun *)&hdr->lun);
2873 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2874 spin_lock_bh(&conn->sess->ttt_lock);
2875 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2876 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2877 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2878 spin_unlock_bh(&conn->sess->ttt_lock);
2879 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
2880 hdr->statsn = cpu_to_be32(conn->stat_sn);
2881 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2882 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2883 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
2884 hdr->data_offset = cpu_to_be32(r2t->offset);
2885 hdr->data_length = cpu_to_be32(r2t->xfer_len);
2886
2887 cmd->iov_misc[0].iov_base = cmd->pdu;
2888 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
2889 tx_size += ISCSI_HDR_LEN;
2890
2891 if (conn->conn_ops->HeaderDigest) {
2892 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2893
2894 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2895 (unsigned char *)hdr, ISCSI_HDR_LEN,
2896 0, NULL, (u8 *)header_digest);
2897
2898 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2899 tx_size += ISCSI_CRC_LEN;
2900 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2901 " PDU 0x%08x\n", *header_digest);
2902 }
2903
2904 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2905 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2906 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2907 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2908 r2t->offset, r2t->xfer_len, conn->cid);
2909
2910 cmd->iov_misc_count = 1;
2911 cmd->tx_size = tx_size;
2912
2913 spin_lock_bh(&cmd->r2t_lock);
2914 r2t->sent_r2t = 1;
2915 spin_unlock_bh(&cmd->r2t_lock);
2916
2917 return 0;
2918 }
2919
2920 /*
2921 * type 0: Normal Operation.
2922 * type 1: Called from Storage Transport.
2923 * type 2: Called from iscsi_task_reassign_complete_write() for
2924 * connection recovery.
2925 */
2926 int iscsit_build_r2ts_for_cmd(
2927 struct iscsi_cmd *cmd,
2928 struct iscsi_conn *conn,
2929 int type)
2930 {
2931 int first_r2t = 1;
2932 u32 offset = 0, xfer_len = 0;
2933
2934 spin_lock_bh(&cmd->r2t_lock);
2935 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2936 spin_unlock_bh(&cmd->r2t_lock);
2937 return 0;
2938 }
2939
2940 if (conn->sess->sess_ops->DataSequenceInOrder && (type != 2))
2941 if (cmd->r2t_offset < cmd->write_data_done)
2942 cmd->r2t_offset = cmd->write_data_done;
2943
2944 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2945 if (conn->sess->sess_ops->DataSequenceInOrder) {
2946 offset = cmd->r2t_offset;
2947
2948 if (first_r2t && (type == 2)) {
2949 xfer_len = ((offset +
2950 (conn->sess->sess_ops->MaxBurstLength -
2951 cmd->next_burst_len) >
2952 cmd->data_length) ?
2953 (cmd->data_length - offset) :
2954 (conn->sess->sess_ops->MaxBurstLength -
2955 cmd->next_burst_len));
2956 } else {
2957 xfer_len = ((offset +
2958 conn->sess->sess_ops->MaxBurstLength) >
2959 cmd->data_length) ?
2960 (cmd->data_length - offset) :
2961 conn->sess->sess_ops->MaxBurstLength;
2962 }
2963 cmd->r2t_offset += xfer_len;
2964
2965 if (cmd->r2t_offset == cmd->data_length)
2966 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2967 } else {
2968 struct iscsi_seq *seq;
2969
2970 seq = iscsit_get_seq_holder_for_r2t(cmd);
2971 if (!seq) {
2972 spin_unlock_bh(&cmd->r2t_lock);
2973 return -1;
2974 }
2975
2976 offset = seq->offset;
2977 xfer_len = seq->xfer_len;
2978
2979 if (cmd->seq_send_order == cmd->seq_count)
2980 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2981 }
2982 cmd->outstanding_r2ts++;
2983 first_r2t = 0;
2984
2985 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
2986 spin_unlock_bh(&cmd->r2t_lock);
2987 return -1;
2988 }
2989
2990 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
2991 break;
2992 }
2993 spin_unlock_bh(&cmd->r2t_lock);
2994
2995 return 0;
2996 }
2997
2998 static int iscsit_send_status(
2999 struct iscsi_cmd *cmd,
3000 struct iscsi_conn *conn)
3001 {
3002 u8 iov_count = 0, recovery;
3003 u32 padding = 0, tx_size = 0;
3004 struct iscsi_scsi_rsp *hdr;
3005 struct kvec *iov;
3006
3007 recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3008 if (!recovery)
3009 cmd->stat_sn = conn->stat_sn++;
3010
3011 spin_lock_bh(&conn->sess->session_stats_lock);
3012 conn->sess->rsp_pdus++;
3013 spin_unlock_bh(&conn->sess->session_stats_lock);
3014
3015 hdr = (struct iscsi_scsi_rsp *) cmd->pdu;
3016 memset(hdr, 0, ISCSI_HDR_LEN);
3017 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3018 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3019 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3020 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3021 hdr->residual_count = cpu_to_be32(cmd->residual_count);
3022 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3023 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3024 hdr->residual_count = cpu_to_be32(cmd->residual_count);
3025 }
3026 hdr->response = cmd->iscsi_response;
3027 hdr->cmd_status = cmd->se_cmd.scsi_status;
3028 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3029 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3030
3031 iscsit_increment_maxcmdsn(cmd, conn->sess);
3032 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3033 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3034
3035 iov = &cmd->iov_misc[0];
3036 iov[iov_count].iov_base = cmd->pdu;
3037 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3038 tx_size += ISCSI_HDR_LEN;
3039
3040 /*
3041 * Attach SENSE DATA payload to iSCSI Response PDU
3042 */
3043 if (cmd->se_cmd.sense_buffer &&
3044 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3045 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3046 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3047 hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
3048 iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
3049 iov[iov_count++].iov_len =
3050 (cmd->se_cmd.scsi_sense_length + padding);
3051 tx_size += cmd->se_cmd.scsi_sense_length;
3052
3053 if (padding) {
3054 memset(cmd->se_cmd.sense_buffer +
3055 cmd->se_cmd.scsi_sense_length, 0, padding);
3056 tx_size += padding;
3057 pr_debug("Adding %u bytes of padding to"
3058 " SENSE.\n", padding);
3059 }
3060
3061 if (conn->conn_ops->DataDigest) {
3062 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3063 cmd->se_cmd.sense_buffer,
3064 (cmd->se_cmd.scsi_sense_length + padding),
3065 0, NULL, (u8 *)&cmd->data_crc);
3066
3067 iov[iov_count].iov_base = &cmd->data_crc;
3068 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3069 tx_size += ISCSI_CRC_LEN;
3070
3071 pr_debug("Attaching CRC32 DataDigest for"
3072 " SENSE, %u bytes CRC 0x%08x\n",
3073 (cmd->se_cmd.scsi_sense_length + padding),
3074 cmd->data_crc);
3075 }
3076
3077 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3078 " Response PDU\n",
3079 cmd->se_cmd.scsi_sense_length);
3080 }
3081
3082 if (conn->conn_ops->HeaderDigest) {
3083 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3084
3085 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3086 (unsigned char *)hdr, ISCSI_HDR_LEN,
3087 0, NULL, (u8 *)header_digest);
3088
3089 iov[0].iov_len += ISCSI_CRC_LEN;
3090 tx_size += ISCSI_CRC_LEN;
3091 pr_debug("Attaching CRC32 HeaderDigest for Response"
3092 " PDU 0x%08x\n", *header_digest);
3093 }
3094
3095 cmd->iov_misc_count = iov_count;
3096 cmd->tx_size = tx_size;
3097
3098 pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3099 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3100 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3101 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3102
3103 return 0;
3104 }
3105
3106 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3107 {
3108 switch (se_tmr->response) {
3109 case TMR_FUNCTION_COMPLETE:
3110 return ISCSI_TMF_RSP_COMPLETE;
3111 case TMR_TASK_DOES_NOT_EXIST:
3112 return ISCSI_TMF_RSP_NO_TASK;
3113 case TMR_LUN_DOES_NOT_EXIST:
3114 return ISCSI_TMF_RSP_NO_LUN;
3115 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3116 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3117 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3118 return ISCSI_TMF_RSP_AUTH_FAILED;
3119 case TMR_FUNCTION_REJECTED:
3120 default:
3121 return ISCSI_TMF_RSP_REJECTED;
3122 }
3123 }
3124
3125 static int iscsit_send_task_mgt_rsp(
3126 struct iscsi_cmd *cmd,
3127 struct iscsi_conn *conn)
3128 {
3129 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3130 struct iscsi_tm_rsp *hdr;
3131 u32 tx_size = 0;
3132
3133 hdr = (struct iscsi_tm_rsp *) cmd->pdu;
3134 memset(hdr, 0, ISCSI_HDR_LEN);
3135 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3136 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3137 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3138 cmd->stat_sn = conn->stat_sn++;
3139 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3140
3141 iscsit_increment_maxcmdsn(cmd, conn->sess);
3142 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3143 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3144
3145 cmd->iov_misc[0].iov_base = cmd->pdu;
3146 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3147 tx_size += ISCSI_HDR_LEN;
3148
3149 if (conn->conn_ops->HeaderDigest) {
3150 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3151
3152 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3153 (unsigned char *)hdr, ISCSI_HDR_LEN,
3154 0, NULL, (u8 *)header_digest);
3155
3156 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3157 tx_size += ISCSI_CRC_LEN;
3158 pr_debug("Attaching CRC32 HeaderDigest for Task"
3159 " Mgmt Response PDU 0x%08x\n", *header_digest);
3160 }
3161
3162 cmd->iov_misc_count = 1;
3163 cmd->tx_size = tx_size;
3164
3165 pr_debug("Built Task Management Response ITT: 0x%08x,"
3166 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3167 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3168
3169 return 0;
3170 }
3171
3172 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3173 {
3174 char *payload = NULL;
3175 struct iscsi_conn *conn = cmd->conn;
3176 struct iscsi_portal_group *tpg;
3177 struct iscsi_tiqn *tiqn;
3178 struct iscsi_tpg_np *tpg_np;
3179 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3180 unsigned char buf[256];
3181
3182 buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ?
3183 32768 : conn->conn_ops->MaxRecvDataSegmentLength;
3184
3185 memset(buf, 0, 256);
3186
3187 payload = kzalloc(buffer_len, GFP_KERNEL);
3188 if (!payload) {
3189 pr_err("Unable to allocate memory for sendtargets"
3190 " response.\n");
3191 return -ENOMEM;
3192 }
3193
3194 spin_lock(&tiqn_lock);
3195 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3196 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3197 len += 1;
3198
3199 if ((len + payload_len) > buffer_len) {
3200 spin_unlock(&tiqn->tiqn_tpg_lock);
3201 end_of_buf = 1;
3202 goto eob;
3203 }
3204 memcpy((void *)payload + payload_len, buf, len);
3205 payload_len += len;
3206
3207 spin_lock(&tiqn->tiqn_tpg_lock);
3208 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3209
3210 spin_lock(&tpg->tpg_state_lock);
3211 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3212 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3213 spin_unlock(&tpg->tpg_state_lock);
3214 continue;
3215 }
3216 spin_unlock(&tpg->tpg_state_lock);
3217
3218 spin_lock(&tpg->tpg_np_lock);
3219 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3220 tpg_np_list) {
3221 len = sprintf(buf, "TargetAddress="
3222 "%s%s%s:%hu,%hu",
3223 (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
3224 "[" : "", tpg_np->tpg_np->np_ip,
3225 (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
3226 "]" : "", tpg_np->tpg_np->np_port,
3227 tpg->tpgt);
3228 len += 1;
3229
3230 if ((len + payload_len) > buffer_len) {
3231 spin_unlock(&tpg->tpg_np_lock);
3232 spin_unlock(&tiqn->tiqn_tpg_lock);
3233 end_of_buf = 1;
3234 goto eob;
3235 }
3236 memcpy((void *)payload + payload_len, buf, len);
3237 payload_len += len;
3238 }
3239 spin_unlock(&tpg->tpg_np_lock);
3240 }
3241 spin_unlock(&tiqn->tiqn_tpg_lock);
3242 eob:
3243 if (end_of_buf)
3244 break;
3245 }
3246 spin_unlock(&tiqn_lock);
3247
3248 cmd->buf_ptr = payload;
3249
3250 return payload_len;
3251 }
3252
3253 /*
3254 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3255 * MaxRecvDataSegmentLength.
3256 */
3257 static int iscsit_send_text_rsp(
3258 struct iscsi_cmd *cmd,
3259 struct iscsi_conn *conn)
3260 {
3261 struct iscsi_text_rsp *hdr;
3262 struct kvec *iov;
3263 u32 padding = 0, tx_size = 0;
3264 int text_length, iov_count = 0;
3265
3266 text_length = iscsit_build_sendtargets_response(cmd);
3267 if (text_length < 0)
3268 return text_length;
3269
3270 padding = ((-text_length) & 3);
3271 if (padding != 0) {
3272 memset(cmd->buf_ptr + text_length, 0, padding);
3273 pr_debug("Attaching %u additional bytes for"
3274 " padding.\n", padding);
3275 }
3276
3277 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3278 memset(hdr, 0, ISCSI_HDR_LEN);
3279 hdr->opcode = ISCSI_OP_TEXT_RSP;
3280 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3281 hton24(hdr->dlength, text_length);
3282 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3283 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3284 cmd->stat_sn = conn->stat_sn++;
3285 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3286
3287 iscsit_increment_maxcmdsn(cmd, conn->sess);
3288 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3289 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3290
3291 iov = &cmd->iov_misc[0];
3292
3293 iov[iov_count].iov_base = cmd->pdu;
3294 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3295 iov[iov_count].iov_base = cmd->buf_ptr;
3296 iov[iov_count++].iov_len = text_length + padding;
3297
3298 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3299
3300 if (conn->conn_ops->HeaderDigest) {
3301 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3302
3303 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3304 (unsigned char *)hdr, ISCSI_HDR_LEN,
3305 0, NULL, (u8 *)header_digest);
3306
3307 iov[0].iov_len += ISCSI_CRC_LEN;
3308 tx_size += ISCSI_CRC_LEN;
3309 pr_debug("Attaching CRC32 HeaderDigest for"
3310 " Text Response PDU 0x%08x\n", *header_digest);
3311 }
3312
3313 if (conn->conn_ops->DataDigest) {
3314 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3315 cmd->buf_ptr, (text_length + padding),
3316 0, NULL, (u8 *)&cmd->data_crc);
3317
3318 iov[iov_count].iov_base = &cmd->data_crc;
3319 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3320 tx_size += ISCSI_CRC_LEN;
3321
3322 pr_debug("Attaching DataDigest for %u bytes of text"
3323 " data, CRC 0x%08x\n", (text_length + padding),
3324 cmd->data_crc);
3325 }
3326
3327 cmd->iov_misc_count = iov_count;
3328 cmd->tx_size = tx_size;
3329
3330 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3331 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3332 text_length, conn->cid);
3333 return 0;
3334 }
3335
3336 static int iscsit_send_reject(
3337 struct iscsi_cmd *cmd,
3338 struct iscsi_conn *conn)
3339 {
3340 u32 iov_count = 0, tx_size = 0;
3341 struct iscsi_reject *hdr;
3342 struct kvec *iov;
3343
3344 hdr = (struct iscsi_reject *) cmd->pdu;
3345 hdr->opcode = ISCSI_OP_REJECT;
3346 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3347 hton24(hdr->dlength, ISCSI_HDR_LEN);
3348 cmd->stat_sn = conn->stat_sn++;
3349 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3350 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3351 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3352
3353 iov = &cmd->iov_misc[0];
3354
3355 iov[iov_count].iov_base = cmd->pdu;
3356 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3357 iov[iov_count].iov_base = cmd->buf_ptr;
3358 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3359
3360 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3361
3362 if (conn->conn_ops->HeaderDigest) {
3363 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3364
3365 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3366 (unsigned char *)hdr, ISCSI_HDR_LEN,
3367 0, NULL, (u8 *)header_digest);
3368
3369 iov[0].iov_len += ISCSI_CRC_LEN;
3370 tx_size += ISCSI_CRC_LEN;
3371 pr_debug("Attaching CRC32 HeaderDigest for"
3372 " REJECT PDU 0x%08x\n", *header_digest);
3373 }
3374
3375 if (conn->conn_ops->DataDigest) {
3376 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3377 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3378 0, NULL, (u8 *)&cmd->data_crc);
3379
3380 iov[iov_count].iov_base = &cmd->data_crc;
3381 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3382 tx_size += ISCSI_CRC_LEN;
3383 pr_debug("Attaching CRC32 DataDigest for REJECT"
3384 " PDU 0x%08x\n", cmd->data_crc);
3385 }
3386
3387 cmd->iov_misc_count = iov_count;
3388 cmd->tx_size = tx_size;
3389
3390 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3391 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3392
3393 return 0;
3394 }
3395
3396 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
3397 {
3398 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
3399 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
3400 wait_for_completion_interruptible_timeout(
3401 &conn->tx_half_close_comp,
3402 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
3403 }
3404 }
3405
3406 #ifdef CONFIG_SMP
3407
3408 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3409 {
3410 struct iscsi_thread_set *ts = conn->thread_set;
3411 int ord, cpu;
3412 /*
3413 * thread_id is assigned from iscsit_global->ts_bitmap from
3414 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3415 *
3416 * Here we use thread_id to determine which CPU that this
3417 * iSCSI connection's iscsi_thread_set will be scheduled to
3418 * execute upon.
3419 */
3420 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3421 #if 0
3422 pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from"
3423 " thread_id: %d\n", ord, ts->thread_id);
3424 #endif
3425 for_each_online_cpu(cpu) {
3426 if (ord-- == 0) {
3427 cpumask_set_cpu(cpu, conn->conn_cpumask);
3428 return;
3429 }
3430 }
3431 /*
3432 * This should never be reached..
3433 */
3434 dump_stack();
3435 cpumask_setall(conn->conn_cpumask);
3436 }
3437
3438 static inline void iscsit_thread_check_cpumask(
3439 struct iscsi_conn *conn,
3440 struct task_struct *p,
3441 int mode)
3442 {
3443 char buf[128];
3444 /*
3445 * mode == 1 signals iscsi_target_tx_thread() usage.
3446 * mode == 0 signals iscsi_target_rx_thread() usage.
3447 */
3448 if (mode == 1) {
3449 if (!conn->conn_tx_reset_cpumask)
3450 return;
3451 conn->conn_tx_reset_cpumask = 0;
3452 } else {
3453 if (!conn->conn_rx_reset_cpumask)
3454 return;
3455 conn->conn_rx_reset_cpumask = 0;
3456 }
3457 /*
3458 * Update the CPU mask for this single kthread so that
3459 * both TX and RX kthreads are scheduled to run on the
3460 * same CPU.
3461 */
3462 memset(buf, 0, 128);
3463 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3464 #if 0
3465 pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():"
3466 " %s for %s\n", buf, p->comm);
3467 #endif
3468 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3469 }
3470
3471 #else
3472
3473 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3474 {
3475 return;
3476 }
3477
3478 #define iscsit_thread_check_cpumask(X, Y, Z) ({})
3479 #endif /* CONFIG_SMP */
3480
3481 int iscsi_target_tx_thread(void *arg)
3482 {
3483 u8 state;
3484 int eodr = 0;
3485 int ret = 0;
3486 int sent_status = 0;
3487 int use_misc = 0;
3488 int map_sg = 0;
3489 struct iscsi_cmd *cmd = NULL;
3490 struct iscsi_conn *conn;
3491 struct iscsi_queue_req *qr = NULL;
3492 struct se_cmd *se_cmd;
3493 struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3494 /*
3495 * Allow ourselves to be interrupted by SIGINT so that a
3496 * connection recovery / failure event can be triggered externally.
3497 */
3498 allow_signal(SIGINT);
3499
3500 restart:
3501 conn = iscsi_tx_thread_pre_handler(ts);
3502 if (!conn)
3503 goto out;
3504
3505 eodr = map_sg = ret = sent_status = use_misc = 0;
3506
3507 while (!kthread_should_stop()) {
3508 /*
3509 * Ensure that both TX and RX per connection kthreads
3510 * are scheduled to run on the same CPU.
3511 */
3512 iscsit_thread_check_cpumask(conn, current, 1);
3513
3514 schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
3515
3516 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3517 signal_pending(current))
3518 goto transport_err;
3519
3520 get_immediate:
3521 qr = iscsit_get_cmd_from_immediate_queue(conn);
3522 if (qr) {
3523 atomic_set(&conn->check_immediate_queue, 0);
3524 cmd = qr->cmd;
3525 state = qr->state;
3526 kmem_cache_free(lio_qr_cache, qr);
3527
3528 spin_lock_bh(&cmd->istate_lock);
3529 switch (state) {
3530 case ISTATE_SEND_R2T:
3531 spin_unlock_bh(&cmd->istate_lock);
3532 ret = iscsit_send_r2t(cmd, conn);
3533 break;
3534 case ISTATE_REMOVE:
3535 spin_unlock_bh(&cmd->istate_lock);
3536
3537 if (cmd->data_direction == DMA_TO_DEVICE)
3538 iscsit_stop_dataout_timer(cmd);
3539
3540 spin_lock_bh(&conn->cmd_lock);
3541 list_del(&cmd->i_list);
3542 spin_unlock_bh(&conn->cmd_lock);
3543
3544 iscsit_free_cmd(cmd);
3545 goto get_immediate;
3546 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3547 spin_unlock_bh(&cmd->istate_lock);
3548 iscsit_mod_nopin_response_timer(conn);
3549 ret = iscsit_send_unsolicited_nopin(cmd,
3550 conn, 1);
3551 break;
3552 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3553 spin_unlock_bh(&cmd->istate_lock);
3554 ret = iscsit_send_unsolicited_nopin(cmd,
3555 conn, 0);
3556 break;
3557 default:
3558 pr_err("Unknown Opcode: 0x%02x ITT:"
3559 " 0x%08x, i_state: %d on CID: %hu\n",
3560 cmd->iscsi_opcode, cmd->init_task_tag, state,
3561 conn->cid);
3562 spin_unlock_bh(&cmd->istate_lock);
3563 goto transport_err;
3564 }
3565 if (ret < 0) {
3566 conn->tx_immediate_queue = 0;
3567 goto transport_err;
3568 }
3569
3570 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3571 conn->tx_immediate_queue = 0;
3572 iscsit_tx_thread_wait_for_tcp(conn);
3573 goto transport_err;
3574 }
3575
3576 spin_lock_bh(&cmd->istate_lock);
3577 switch (state) {
3578 case ISTATE_SEND_R2T:
3579 spin_unlock_bh(&cmd->istate_lock);
3580 spin_lock_bh(&cmd->dataout_timeout_lock);
3581 iscsit_start_dataout_timer(cmd, conn);
3582 spin_unlock_bh(&cmd->dataout_timeout_lock);
3583 break;
3584 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3585 cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE;
3586 spin_unlock_bh(&cmd->istate_lock);
3587 break;
3588 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3589 cmd->i_state = ISTATE_SENT_STATUS;
3590 spin_unlock_bh(&cmd->istate_lock);
3591 break;
3592 default:
3593 pr_err("Unknown Opcode: 0x%02x ITT:"
3594 " 0x%08x, i_state: %d on CID: %hu\n",
3595 cmd->iscsi_opcode, cmd->init_task_tag,
3596 state, conn->cid);
3597 spin_unlock_bh(&cmd->istate_lock);
3598 goto transport_err;
3599 }
3600 goto get_immediate;
3601 } else
3602 conn->tx_immediate_queue = 0;
3603
3604 get_response:
3605 qr = iscsit_get_cmd_from_response_queue(conn);
3606 if (qr) {
3607 cmd = qr->cmd;
3608 state = qr->state;
3609 kmem_cache_free(lio_qr_cache, qr);
3610
3611 spin_lock_bh(&cmd->istate_lock);
3612 check_rsp_state:
3613 switch (state) {
3614 case ISTATE_SEND_DATAIN:
3615 spin_unlock_bh(&cmd->istate_lock);
3616 ret = iscsit_send_data_in(cmd, conn,
3617 &eodr);
3618 map_sg = 1;
3619 break;
3620 case ISTATE_SEND_STATUS:
3621 case ISTATE_SEND_STATUS_RECOVERY:
3622 spin_unlock_bh(&cmd->istate_lock);
3623 use_misc = 1;
3624 ret = iscsit_send_status(cmd, conn);
3625 break;
3626 case ISTATE_SEND_LOGOUTRSP:
3627 spin_unlock_bh(&cmd->istate_lock);
3628 use_misc = 1;
3629 ret = iscsit_send_logout_response(cmd, conn);
3630 break;
3631 case ISTATE_SEND_ASYNCMSG:
3632 spin_unlock_bh(&cmd->istate_lock);
3633 use_misc = 1;
3634 ret = iscsit_send_conn_drop_async_message(
3635 cmd, conn);
3636 break;
3637 case ISTATE_SEND_NOPIN:
3638 spin_unlock_bh(&cmd->istate_lock);
3639 use_misc = 1;
3640 ret = iscsit_send_nopin_response(cmd, conn);
3641 break;
3642 case ISTATE_SEND_REJECT:
3643 spin_unlock_bh(&cmd->istate_lock);
3644 use_misc = 1;
3645 ret = iscsit_send_reject(cmd, conn);
3646 break;
3647 case ISTATE_SEND_TASKMGTRSP:
3648 spin_unlock_bh(&cmd->istate_lock);
3649 use_misc = 1;
3650 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3651 if (ret != 0)
3652 break;
3653 ret = iscsit_tmr_post_handler(cmd, conn);
3654 if (ret != 0)
3655 iscsit_fall_back_to_erl0(conn->sess);
3656 break;
3657 case ISTATE_SEND_TEXTRSP:
3658 spin_unlock_bh(&cmd->istate_lock);
3659 use_misc = 1;
3660 ret = iscsit_send_text_rsp(cmd, conn);
3661 break;
3662 default:
3663 pr_err("Unknown Opcode: 0x%02x ITT:"
3664 " 0x%08x, i_state: %d on CID: %hu\n",
3665 cmd->iscsi_opcode, cmd->init_task_tag,
3666 state, conn->cid);
3667 spin_unlock_bh(&cmd->istate_lock);
3668 goto transport_err;
3669 }
3670 if (ret < 0) {
3671 conn->tx_response_queue = 0;
3672 goto transport_err;
3673 }
3674
3675 se_cmd = &cmd->se_cmd;
3676
3677 if (map_sg && !conn->conn_ops->IFMarker) {
3678 if (iscsit_fe_sendpage_sg(cmd, conn) < 0) {
3679 conn->tx_response_queue = 0;
3680 iscsit_tx_thread_wait_for_tcp(conn);
3681 iscsit_unmap_iovec(cmd);
3682 goto transport_err;
3683 }
3684 } else {
3685 if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) {
3686 conn->tx_response_queue = 0;
3687 iscsit_tx_thread_wait_for_tcp(conn);
3688 iscsit_unmap_iovec(cmd);
3689 goto transport_err;
3690 }
3691 }
3692 map_sg = 0;
3693 iscsit_unmap_iovec(cmd);
3694
3695 spin_lock_bh(&cmd->istate_lock);
3696 switch (state) {
3697 case ISTATE_SEND_DATAIN:
3698 if (!eodr)
3699 goto check_rsp_state;
3700
3701 if (eodr == 1) {
3702 cmd->i_state = ISTATE_SENT_LAST_DATAIN;
3703 sent_status = 1;
3704 eodr = use_misc = 0;
3705 } else if (eodr == 2) {
3706 cmd->i_state = state =
3707 ISTATE_SEND_STATUS;
3708 sent_status = 0;
3709 eodr = use_misc = 0;
3710 goto check_rsp_state;
3711 }
3712 break;
3713 case ISTATE_SEND_STATUS:
3714 use_misc = 0;
3715 sent_status = 1;
3716 break;
3717 case ISTATE_SEND_ASYNCMSG:
3718 case ISTATE_SEND_NOPIN:
3719 case ISTATE_SEND_STATUS_RECOVERY:
3720 case ISTATE_SEND_TEXTRSP:
3721 use_misc = 0;
3722 sent_status = 1;
3723 break;
3724 case ISTATE_SEND_REJECT:
3725 use_misc = 0;
3726 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3727 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3728 spin_unlock_bh(&cmd->istate_lock);
3729 complete(&cmd->reject_comp);
3730 goto transport_err;
3731 }
3732 complete(&cmd->reject_comp);
3733 break;
3734 case ISTATE_SEND_TASKMGTRSP:
3735 use_misc = 0;
3736 sent_status = 1;
3737 break;
3738 case ISTATE_SEND_LOGOUTRSP:
3739 spin_unlock_bh(&cmd->istate_lock);
3740 if (!iscsit_logout_post_handler(cmd, conn))
3741 goto restart;
3742 spin_lock_bh(&cmd->istate_lock);
3743 use_misc = 0;
3744 sent_status = 1;
3745 break;
3746 default:
3747 pr_err("Unknown Opcode: 0x%02x ITT:"
3748 " 0x%08x, i_state: %d on CID: %hu\n",
3749 cmd->iscsi_opcode, cmd->init_task_tag,
3750 cmd->i_state, conn->cid);
3751 spin_unlock_bh(&cmd->istate_lock);
3752 goto transport_err;
3753 }
3754
3755 if (sent_status) {
3756 cmd->i_state = ISTATE_SENT_STATUS;
3757 sent_status = 0;
3758 }
3759 spin_unlock_bh(&cmd->istate_lock);
3760
3761 if (atomic_read(&conn->check_immediate_queue))
3762 goto get_immediate;
3763
3764 goto get_response;
3765 } else
3766 conn->tx_response_queue = 0;
3767 }
3768
3769 transport_err:
3770 iscsit_take_action_for_connection_exit(conn);
3771 goto restart;
3772 out:
3773 return 0;
3774 }
3775
3776 int iscsi_target_rx_thread(void *arg)
3777 {
3778 int ret;
3779 u8 buffer[ISCSI_HDR_LEN], opcode;
3780 u32 checksum = 0, digest = 0;
3781 struct iscsi_conn *conn = NULL;
3782 struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3783 struct kvec iov;
3784 /*
3785 * Allow ourselves to be interrupted by SIGINT so that a
3786 * connection recovery / failure event can be triggered externally.
3787 */
3788 allow_signal(SIGINT);
3789
3790 restart:
3791 conn = iscsi_rx_thread_pre_handler(ts);
3792 if (!conn)
3793 goto out;
3794
3795 while (!kthread_should_stop()) {
3796 /*
3797 * Ensure that both TX and RX per connection kthreads
3798 * are scheduled to run on the same CPU.
3799 */
3800 iscsit_thread_check_cpumask(conn, current, 0);
3801
3802 memset(buffer, 0, ISCSI_HDR_LEN);
3803 memset(&iov, 0, sizeof(struct kvec));
3804
3805 iov.iov_base = buffer;
3806 iov.iov_len = ISCSI_HDR_LEN;
3807
3808 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3809 if (ret != ISCSI_HDR_LEN) {
3810 iscsit_rx_thread_wait_for_tcp(conn);
3811 goto transport_err;
3812 }
3813
3814 /*
3815 * Set conn->bad_hdr for use with REJECT PDUs.
3816 */
3817 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3818
3819 if (conn->conn_ops->HeaderDigest) {
3820 iov.iov_base = &digest;
3821 iov.iov_len = ISCSI_CRC_LEN;
3822
3823 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3824 if (ret != ISCSI_CRC_LEN) {
3825 iscsit_rx_thread_wait_for_tcp(conn);
3826 goto transport_err;
3827 }
3828
3829 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3830 buffer, ISCSI_HDR_LEN,
3831 0, NULL, (u8 *)&checksum);
3832
3833 if (digest != checksum) {
3834 pr_err("HeaderDigest CRC32C failed,"
3835 " received 0x%08x, computed 0x%08x\n",
3836 digest, checksum);
3837 /*
3838 * Set the PDU to 0xff so it will intentionally
3839 * hit default in the switch below.
3840 */
3841 memset(buffer, 0xff, ISCSI_HDR_LEN);
3842 spin_lock_bh(&conn->sess->session_stats_lock);
3843 conn->sess->conn_digest_errors++;
3844 spin_unlock_bh(&conn->sess->session_stats_lock);
3845 } else {
3846 pr_debug("Got HeaderDigest CRC32C"
3847 " 0x%08x\n", checksum);
3848 }
3849 }
3850
3851 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3852 goto transport_err;
3853
3854 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3855
3856 if (conn->sess->sess_ops->SessionType &&
3857 ((!(opcode & ISCSI_OP_TEXT)) ||
3858 (!(opcode & ISCSI_OP_LOGOUT)))) {
3859 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3860 " while in Discovery Session, rejecting.\n", opcode);
3861 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3862 buffer, conn);
3863 goto transport_err;
3864 }
3865
3866 switch (opcode) {
3867 case ISCSI_OP_SCSI_CMD:
3868 if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3869 goto transport_err;
3870 break;
3871 case ISCSI_OP_SCSI_DATA_OUT:
3872 if (iscsit_handle_data_out(conn, buffer) < 0)
3873 goto transport_err;
3874 break;
3875 case ISCSI_OP_NOOP_OUT:
3876 if (iscsit_handle_nop_out(conn, buffer) < 0)
3877 goto transport_err;
3878 break;
3879 case ISCSI_OP_SCSI_TMFUNC:
3880 if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3881 goto transport_err;
3882 break;
3883 case ISCSI_OP_TEXT:
3884 if (iscsit_handle_text_cmd(conn, buffer) < 0)
3885 goto transport_err;
3886 break;
3887 case ISCSI_OP_LOGOUT:
3888 ret = iscsit_handle_logout_cmd(conn, buffer);
3889 if (ret > 0) {
3890 wait_for_completion_timeout(&conn->conn_logout_comp,
3891 SECONDS_FOR_LOGOUT_COMP * HZ);
3892 goto transport_err;
3893 } else if (ret < 0)
3894 goto transport_err;
3895 break;
3896 case ISCSI_OP_SNACK:
3897 if (iscsit_handle_snack(conn, buffer) < 0)
3898 goto transport_err;
3899 break;
3900 default:
3901 pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3902 opcode);
3903 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3904 pr_err("Cannot recover from unknown"
3905 " opcode while ERL=0, closing iSCSI connection"
3906 ".\n");
3907 goto transport_err;
3908 }
3909 if (!conn->conn_ops->OFMarker) {
3910 pr_err("Unable to recover from unknown"
3911 " opcode while OFMarker=No, closing iSCSI"
3912 " connection.\n");
3913 goto transport_err;
3914 }
3915 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3916 pr_err("Unable to recover from unknown"
3917 " opcode, closing iSCSI connection.\n");
3918 goto transport_err;
3919 }
3920 break;
3921 }
3922 }
3923
3924 transport_err:
3925 if (!signal_pending(current))
3926 atomic_set(&conn->transport_failed, 1);
3927 iscsit_take_action_for_connection_exit(conn);
3928 goto restart;
3929 out:
3930 return 0;
3931 }
3932
3933 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3934 {
3935 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3936 struct iscsi_session *sess = conn->sess;
3937 /*
3938 * We expect this function to only ever be called from either RX or TX
3939 * thread context via iscsit_close_connection() once the other context
3940 * has been reset -> returned sleeping pre-handler state.
3941 */
3942 spin_lock_bh(&conn->cmd_lock);
3943 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) {
3944
3945 list_del(&cmd->i_list);
3946 spin_unlock_bh(&conn->cmd_lock);
3947
3948 iscsit_increment_maxcmdsn(cmd, sess);
3949
3950 iscsit_free_cmd(cmd);
3951
3952 spin_lock_bh(&conn->cmd_lock);
3953 }
3954 spin_unlock_bh(&conn->cmd_lock);
3955 }
3956
3957 static void iscsit_stop_timers_for_cmds(
3958 struct iscsi_conn *conn)
3959 {
3960 struct iscsi_cmd *cmd;
3961
3962 spin_lock_bh(&conn->cmd_lock);
3963 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
3964 if (cmd->data_direction == DMA_TO_DEVICE)
3965 iscsit_stop_dataout_timer(cmd);
3966 }
3967 spin_unlock_bh(&conn->cmd_lock);
3968 }
3969
3970 int iscsit_close_connection(
3971 struct iscsi_conn *conn)
3972 {
3973 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3974 struct iscsi_session *sess = conn->sess;
3975
3976 pr_debug("Closing iSCSI connection CID %hu on SID:"
3977 " %u\n", conn->cid, sess->sid);
3978 /*
3979 * Always up conn_logout_comp just in case the RX Thread is sleeping
3980 * and the logout response never got sent because the connection
3981 * failed.
3982 */
3983 complete(&conn->conn_logout_comp);
3984
3985 iscsi_release_thread_set(conn);
3986
3987 iscsit_stop_timers_for_cmds(conn);
3988 iscsit_stop_nopin_response_timer(conn);
3989 iscsit_stop_nopin_timer(conn);
3990 iscsit_free_queue_reqs_for_conn(conn);
3991
3992 /*
3993 * During Connection recovery drop unacknowledged out of order
3994 * commands for this connection, and prepare the other commands
3995 * for realligence.
3996 *
3997 * During normal operation clear the out of order commands (but
3998 * do not free the struct iscsi_ooo_cmdsn's) and release all
3999 * struct iscsi_cmds.
4000 */
4001 if (atomic_read(&conn->connection_recovery)) {
4002 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4003 iscsit_prepare_cmds_for_realligance(conn);
4004 } else {
4005 iscsit_clear_ooo_cmdsns_for_conn(conn);
4006 iscsit_release_commands_from_conn(conn);
4007 }
4008
4009 /*
4010 * Handle decrementing session or connection usage count if
4011 * a logout response was not able to be sent because the
4012 * connection failed. Fall back to Session Recovery here.
4013 */
4014 if (atomic_read(&conn->conn_logout_remove)) {
4015 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4016 iscsit_dec_conn_usage_count(conn);
4017 iscsit_dec_session_usage_count(sess);
4018 }
4019 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4020 iscsit_dec_conn_usage_count(conn);
4021
4022 atomic_set(&conn->conn_logout_remove, 0);
4023 atomic_set(&sess->session_reinstatement, 0);
4024 atomic_set(&sess->session_fall_back_to_erl0, 1);
4025 }
4026
4027 spin_lock_bh(&sess->conn_lock);
4028 list_del(&conn->conn_list);
4029
4030 /*
4031 * Attempt to let the Initiator know this connection failed by
4032 * sending an Connection Dropped Async Message on another
4033 * active connection.
4034 */
4035 if (atomic_read(&conn->connection_recovery))
4036 iscsit_build_conn_drop_async_message(conn);
4037
4038 spin_unlock_bh(&sess->conn_lock);
4039
4040 /*
4041 * If connection reinstatement is being performed on this connection,
4042 * up the connection reinstatement semaphore that is being blocked on
4043 * in iscsit_cause_connection_reinstatement().
4044 */
4045 spin_lock_bh(&conn->state_lock);
4046 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4047 spin_unlock_bh(&conn->state_lock);
4048 complete(&conn->conn_wait_comp);
4049 wait_for_completion(&conn->conn_post_wait_comp);
4050 spin_lock_bh(&conn->state_lock);
4051 }
4052
4053 /*
4054 * If connection reinstatement is being performed on this connection
4055 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4056 * connection wait rcfr semaphore that is being blocked on
4057 * an iscsit_connection_reinstatement_rcfr().
4058 */
4059 if (atomic_read(&conn->connection_wait_rcfr)) {
4060 spin_unlock_bh(&conn->state_lock);
4061 complete(&conn->conn_wait_rcfr_comp);
4062 wait_for_completion(&conn->conn_post_wait_comp);
4063 spin_lock_bh(&conn->state_lock);
4064 }
4065 atomic_set(&conn->connection_reinstatement, 1);
4066 spin_unlock_bh(&conn->state_lock);
4067
4068 /*
4069 * If any other processes are accessing this connection pointer we
4070 * must wait until they have completed.
4071 */
4072 iscsit_check_conn_usage_count(conn);
4073
4074 if (conn->conn_rx_hash.tfm)
4075 crypto_free_hash(conn->conn_rx_hash.tfm);
4076 if (conn->conn_tx_hash.tfm)
4077 crypto_free_hash(conn->conn_tx_hash.tfm);
4078
4079 if (conn->conn_cpumask)
4080 free_cpumask_var(conn->conn_cpumask);
4081
4082 kfree(conn->conn_ops);
4083 conn->conn_ops = NULL;
4084
4085 if (conn->sock) {
4086 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
4087 kfree(conn->sock->file);
4088 conn->sock->file = NULL;
4089 }
4090 sock_release(conn->sock);
4091 }
4092 conn->thread_set = NULL;
4093
4094 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4095 conn->conn_state = TARG_CONN_STATE_FREE;
4096 kfree(conn);
4097
4098 spin_lock_bh(&sess->conn_lock);
4099 atomic_dec(&sess->nconn);
4100 pr_debug("Decremented iSCSI connection count to %hu from node:"
4101 " %s\n", atomic_read(&sess->nconn),
4102 sess->sess_ops->InitiatorName);
4103 /*
4104 * Make sure that if one connection fails in an non ERL=2 iSCSI
4105 * Session that they all fail.
4106 */
4107 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4108 !atomic_read(&sess->session_logout))
4109 atomic_set(&sess->session_fall_back_to_erl0, 1);
4110
4111 /*
4112 * If this was not the last connection in the session, and we are
4113 * performing session reinstatement or falling back to ERL=0, call
4114 * iscsit_stop_session() without sleeping to shutdown the other
4115 * active connections.
4116 */
4117 if (atomic_read(&sess->nconn)) {
4118 if (!atomic_read(&sess->session_reinstatement) &&
4119 !atomic_read(&sess->session_fall_back_to_erl0)) {
4120 spin_unlock_bh(&sess->conn_lock);
4121 return 0;
4122 }
4123 if (!atomic_read(&sess->session_stop_active)) {
4124 atomic_set(&sess->session_stop_active, 1);
4125 spin_unlock_bh(&sess->conn_lock);
4126 iscsit_stop_session(sess, 0, 0);
4127 return 0;
4128 }
4129 spin_unlock_bh(&sess->conn_lock);
4130 return 0;
4131 }
4132
4133 /*
4134 * If this was the last connection in the session and one of the
4135 * following is occurring:
4136 *
4137 * Session Reinstatement is not being performed, and are falling back
4138 * to ERL=0 call iscsit_close_session().
4139 *
4140 * Session Logout was requested. iscsit_close_session() will be called
4141 * elsewhere.
4142 *
4143 * Session Continuation is not being performed, start the Time2Retain
4144 * handler and check if sleep_on_sess_wait_sem is active.
4145 */
4146 if (!atomic_read(&sess->session_reinstatement) &&
4147 atomic_read(&sess->session_fall_back_to_erl0)) {
4148 spin_unlock_bh(&sess->conn_lock);
4149 iscsit_close_session(sess);
4150
4151 return 0;
4152 } else if (atomic_read(&sess->session_logout)) {
4153 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4154 sess->session_state = TARG_SESS_STATE_FREE;
4155 spin_unlock_bh(&sess->conn_lock);
4156
4157 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4158 complete(&sess->session_wait_comp);
4159
4160 return 0;
4161 } else {
4162 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4163 sess->session_state = TARG_SESS_STATE_FAILED;
4164
4165 if (!atomic_read(&sess->session_continuation)) {
4166 spin_unlock_bh(&sess->conn_lock);
4167 iscsit_start_time2retain_handler(sess);
4168 } else
4169 spin_unlock_bh(&sess->conn_lock);
4170
4171 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4172 complete(&sess->session_wait_comp);
4173
4174 return 0;
4175 }
4176 spin_unlock_bh(&sess->conn_lock);
4177
4178 return 0;
4179 }
4180
4181 int iscsit_close_session(struct iscsi_session *sess)
4182 {
4183 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4184 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4185
4186 if (atomic_read(&sess->nconn)) {
4187 pr_err("%d connection(s) still exist for iSCSI session"
4188 " to %s\n", atomic_read(&sess->nconn),
4189 sess->sess_ops->InitiatorName);
4190 BUG();
4191 }
4192
4193 spin_lock_bh(&se_tpg->session_lock);
4194 atomic_set(&sess->session_logout, 1);
4195 atomic_set(&sess->session_reinstatement, 1);
4196 iscsit_stop_time2retain_timer(sess);
4197 spin_unlock_bh(&se_tpg->session_lock);
4198
4199 /*
4200 * transport_deregister_session_configfs() will clear the
4201 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4202 * can be setting it again with __transport_register_session() in
4203 * iscsi_post_login_handler() again after the iscsit_stop_session()
4204 * completes in iscsi_np context.
4205 */
4206 transport_deregister_session_configfs(sess->se_sess);
4207
4208 /*
4209 * If any other processes are accessing this session pointer we must
4210 * wait until they have completed. If we are in an interrupt (the
4211 * time2retain handler) and contain and active session usage count we
4212 * restart the timer and exit.
4213 */
4214 if (!in_interrupt()) {
4215 if (iscsit_check_session_usage_count(sess) == 1)
4216 iscsit_stop_session(sess, 1, 1);
4217 } else {
4218 if (iscsit_check_session_usage_count(sess) == 2) {
4219 atomic_set(&sess->session_logout, 0);
4220 iscsit_start_time2retain_handler(sess);
4221 return 0;
4222 }
4223 }
4224
4225 transport_deregister_session(sess->se_sess);
4226
4227 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4228 iscsit_free_connection_recovery_entires(sess);
4229
4230 iscsit_free_all_ooo_cmdsns(sess);
4231
4232 spin_lock_bh(&se_tpg->session_lock);
4233 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4234 sess->session_state = TARG_SESS_STATE_FREE;
4235 pr_debug("Released iSCSI session from node: %s\n",
4236 sess->sess_ops->InitiatorName);
4237 tpg->nsessions--;
4238 if (tpg->tpg_tiqn)
4239 tpg->tpg_tiqn->tiqn_nsessions--;
4240
4241 pr_debug("Decremented number of active iSCSI Sessions on"
4242 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4243
4244 spin_lock(&sess_idr_lock);
4245 idr_remove(&sess_idr, sess->session_index);
4246 spin_unlock(&sess_idr_lock);
4247
4248 kfree(sess->sess_ops);
4249 sess->sess_ops = NULL;
4250 spin_unlock_bh(&se_tpg->session_lock);
4251
4252 kfree(sess);
4253 return 0;
4254 }
4255
4256 static void iscsit_logout_post_handler_closesession(
4257 struct iscsi_conn *conn)
4258 {
4259 struct iscsi_session *sess = conn->sess;
4260
4261 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4262 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4263
4264 atomic_set(&conn->conn_logout_remove, 0);
4265 complete(&conn->conn_logout_comp);
4266
4267 iscsit_dec_conn_usage_count(conn);
4268 iscsit_stop_session(sess, 1, 1);
4269 iscsit_dec_session_usage_count(sess);
4270 iscsit_close_session(sess);
4271 }
4272
4273 static void iscsit_logout_post_handler_samecid(
4274 struct iscsi_conn *conn)
4275 {
4276 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4277 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4278
4279 atomic_set(&conn->conn_logout_remove, 0);
4280 complete(&conn->conn_logout_comp);
4281
4282 iscsit_cause_connection_reinstatement(conn, 1);
4283 iscsit_dec_conn_usage_count(conn);
4284 }
4285
4286 static void iscsit_logout_post_handler_diffcid(
4287 struct iscsi_conn *conn,
4288 u16 cid)
4289 {
4290 struct iscsi_conn *l_conn;
4291 struct iscsi_session *sess = conn->sess;
4292
4293 if (!sess)
4294 return;
4295
4296 spin_lock_bh(&sess->conn_lock);
4297 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4298 if (l_conn->cid == cid) {
4299 iscsit_inc_conn_usage_count(l_conn);
4300 break;
4301 }
4302 }
4303 spin_unlock_bh(&sess->conn_lock);
4304
4305 if (!l_conn)
4306 return;
4307
4308 if (l_conn->sock)
4309 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4310
4311 spin_lock_bh(&l_conn->state_lock);
4312 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4313 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4314 spin_unlock_bh(&l_conn->state_lock);
4315
4316 iscsit_cause_connection_reinstatement(l_conn, 1);
4317 iscsit_dec_conn_usage_count(l_conn);
4318 }
4319
4320 /*
4321 * Return of 0 causes the TX thread to restart.
4322 */
4323 static int iscsit_logout_post_handler(
4324 struct iscsi_cmd *cmd,
4325 struct iscsi_conn *conn)
4326 {
4327 int ret = 0;
4328
4329 switch (cmd->logout_reason) {
4330 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4331 switch (cmd->logout_response) {
4332 case ISCSI_LOGOUT_SUCCESS:
4333 case ISCSI_LOGOUT_CLEANUP_FAILED:
4334 default:
4335 iscsit_logout_post_handler_closesession(conn);
4336 break;
4337 }
4338 ret = 0;
4339 break;
4340 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4341 if (conn->cid == cmd->logout_cid) {
4342 switch (cmd->logout_response) {
4343 case ISCSI_LOGOUT_SUCCESS:
4344 case ISCSI_LOGOUT_CLEANUP_FAILED:
4345 default:
4346 iscsit_logout_post_handler_samecid(conn);
4347 break;
4348 }
4349 ret = 0;
4350 } else {
4351 switch (cmd->logout_response) {
4352 case ISCSI_LOGOUT_SUCCESS:
4353 iscsit_logout_post_handler_diffcid(conn,
4354 cmd->logout_cid);
4355 break;
4356 case ISCSI_LOGOUT_CID_NOT_FOUND:
4357 case ISCSI_LOGOUT_CLEANUP_FAILED:
4358 default:
4359 break;
4360 }
4361 ret = 1;
4362 }
4363 break;
4364 case ISCSI_LOGOUT_REASON_RECOVERY:
4365 switch (cmd->logout_response) {
4366 case ISCSI_LOGOUT_SUCCESS:
4367 case ISCSI_LOGOUT_CID_NOT_FOUND:
4368 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4369 case ISCSI_LOGOUT_CLEANUP_FAILED:
4370 default:
4371 break;
4372 }
4373 ret = 1;
4374 break;
4375 default:
4376 break;
4377
4378 }
4379 return ret;
4380 }
4381
4382 void iscsit_fail_session(struct iscsi_session *sess)
4383 {
4384 struct iscsi_conn *conn;
4385
4386 spin_lock_bh(&sess->conn_lock);
4387 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4388 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4389 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4390 }
4391 spin_unlock_bh(&sess->conn_lock);
4392
4393 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4394 sess->session_state = TARG_SESS_STATE_FAILED;
4395 }
4396
4397 int iscsit_free_session(struct iscsi_session *sess)
4398 {
4399 u16 conn_count = atomic_read(&sess->nconn);
4400 struct iscsi_conn *conn, *conn_tmp = NULL;
4401 int is_last;
4402
4403 spin_lock_bh(&sess->conn_lock);
4404 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4405
4406 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4407 conn_list) {
4408 if (conn_count == 0)
4409 break;
4410
4411 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4412 is_last = 1;
4413 } else {
4414 iscsit_inc_conn_usage_count(conn_tmp);
4415 is_last = 0;
4416 }
4417 iscsit_inc_conn_usage_count(conn);
4418
4419 spin_unlock_bh(&sess->conn_lock);
4420 iscsit_cause_connection_reinstatement(conn, 1);
4421 spin_lock_bh(&sess->conn_lock);
4422
4423 iscsit_dec_conn_usage_count(conn);
4424 if (is_last == 0)
4425 iscsit_dec_conn_usage_count(conn_tmp);
4426
4427 conn_count--;
4428 }
4429
4430 if (atomic_read(&sess->nconn)) {
4431 spin_unlock_bh(&sess->conn_lock);
4432 wait_for_completion(&sess->session_wait_comp);
4433 } else
4434 spin_unlock_bh(&sess->conn_lock);
4435
4436 iscsit_close_session(sess);
4437 return 0;
4438 }
4439
4440 void iscsit_stop_session(
4441 struct iscsi_session *sess,
4442 int session_sleep,
4443 int connection_sleep)
4444 {
4445 u16 conn_count = atomic_read(&sess->nconn);
4446 struct iscsi_conn *conn, *conn_tmp = NULL;
4447 int is_last;
4448
4449 spin_lock_bh(&sess->conn_lock);
4450 if (session_sleep)
4451 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4452
4453 if (connection_sleep) {
4454 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4455 conn_list) {
4456 if (conn_count == 0)
4457 break;
4458
4459 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4460 is_last = 1;
4461 } else {
4462 iscsit_inc_conn_usage_count(conn_tmp);
4463 is_last = 0;
4464 }
4465 iscsit_inc_conn_usage_count(conn);
4466
4467 spin_unlock_bh(&sess->conn_lock);
4468 iscsit_cause_connection_reinstatement(conn, 1);
4469 spin_lock_bh(&sess->conn_lock);
4470
4471 iscsit_dec_conn_usage_count(conn);
4472 if (is_last == 0)
4473 iscsit_dec_conn_usage_count(conn_tmp);
4474 conn_count--;
4475 }
4476 } else {
4477 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4478 iscsit_cause_connection_reinstatement(conn, 0);
4479 }
4480
4481 if (session_sleep && atomic_read(&sess->nconn)) {
4482 spin_unlock_bh(&sess->conn_lock);
4483 wait_for_completion(&sess->session_wait_comp);
4484 } else
4485 spin_unlock_bh(&sess->conn_lock);
4486 }
4487
4488 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4489 {
4490 struct iscsi_session *sess;
4491 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4492 struct se_session *se_sess, *se_sess_tmp;
4493 int session_count = 0;
4494
4495 spin_lock_bh(&se_tpg->session_lock);
4496 if (tpg->nsessions && !force) {
4497 spin_unlock_bh(&se_tpg->session_lock);
4498 return -1;
4499 }
4500
4501 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4502 sess_list) {
4503 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4504
4505 spin_lock(&sess->conn_lock);
4506 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4507 atomic_read(&sess->session_logout) ||
4508 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4509 spin_unlock(&sess->conn_lock);
4510 continue;
4511 }
4512 atomic_set(&sess->session_reinstatement, 1);
4513 spin_unlock(&sess->conn_lock);
4514 spin_unlock_bh(&se_tpg->session_lock);
4515
4516 iscsit_free_session(sess);
4517 spin_lock_bh(&se_tpg->session_lock);
4518
4519 session_count++;
4520 }
4521 spin_unlock_bh(&se_tpg->session_lock);
4522
4523 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4524 " Group: %hu\n", session_count, tpg->tpgt);
4525 return 0;
4526 }
4527
4528 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4529 MODULE_VERSION("4.1.x");
4530 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4531 MODULE_LICENSE("GPL");
4532
4533 module_init(iscsi_target_init_module);
4534 module_exit(iscsi_target_cleanup_module);
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