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Linux 5.1.15
[linux/fpc-iii.git] / drivers / target / iscsi / iscsi_target.c
blob5ce6e2a40e00cf1171466726319dd589accb9f5d
1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19 #include <crypto/hash.h>
20 #include <linux/string.h>
21 #include <linux/kthread.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
25 #include <linux/idr.h>
26 #include <linux/delay.h>
27 #include <linux/sched/signal.h>
28 #include <asm/unaligned.h>
29 #include <linux/inet.h>
30 #include <net/ipv6.h>
31 #include <scsi/scsi_proto.h>
32 #include <scsi/iscsi_proto.h>
33 #include <scsi/scsi_tcq.h>
34 #include <target/target_core_base.h>
35 #include <target/target_core_fabric.h>
36
37 #include <target/iscsi/iscsi_target_core.h>
38 #include "iscsi_target_parameters.h"
39 #include "iscsi_target_seq_pdu_list.h"
40 #include "iscsi_target_datain_values.h"
41 #include "iscsi_target_erl0.h"
42 #include "iscsi_target_erl1.h"
43 #include "iscsi_target_erl2.h"
44 #include "iscsi_target_login.h"
45 #include "iscsi_target_tmr.h"
46 #include "iscsi_target_tpg.h"
47 #include "iscsi_target_util.h"
48 #include "iscsi_target.h"
49 #include "iscsi_target_device.h"
50 #include <target/iscsi/iscsi_target_stat.h>
51
52 #include <target/iscsi/iscsi_transport.h>
53
54 static LIST_HEAD(g_tiqn_list);
55 static LIST_HEAD(g_np_list);
56 static DEFINE_SPINLOCK(tiqn_lock);
57 static DEFINE_MUTEX(np_lock);
58
59 static struct idr tiqn_idr;
60 DEFINE_IDA(sess_ida);
61 struct mutex auth_id_lock;
62
63 struct iscsit_global *iscsit_global;
64
65 struct kmem_cache *lio_qr_cache;
66 struct kmem_cache *lio_dr_cache;
67 struct kmem_cache *lio_ooo_cache;
68 struct kmem_cache *lio_r2t_cache;
69
70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
71 struct iscsi_scsi_req *, u32);
72
73 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
74 {
75 struct iscsi_tiqn *tiqn = NULL;
76
77 spin_lock(&tiqn_lock);
78 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
79 if (!strcmp(tiqn->tiqn, buf)) {
80
81 spin_lock(&tiqn->tiqn_state_lock);
82 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
83 tiqn->tiqn_access_count++;
84 spin_unlock(&tiqn->tiqn_state_lock);
85 spin_unlock(&tiqn_lock);
86 return tiqn;
87 }
88 spin_unlock(&tiqn->tiqn_state_lock);
89 }
90 }
91 spin_unlock(&tiqn_lock);
92
93 return NULL;
94 }
95
96 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
97 {
98 spin_lock(&tiqn->tiqn_state_lock);
99 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
100 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
101 spin_unlock(&tiqn->tiqn_state_lock);
102 return 0;
103 }
104 spin_unlock(&tiqn->tiqn_state_lock);
105
106 return -1;
107 }
108
109 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
110 {
111 spin_lock(&tiqn->tiqn_state_lock);
112 tiqn->tiqn_access_count--;
113 spin_unlock(&tiqn->tiqn_state_lock);
114 }
115
116 /*
117 * Note that IQN formatting is expected to be done in userspace, and
118 * no explict IQN format checks are done here.
119 */
120 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
121 {
122 struct iscsi_tiqn *tiqn = NULL;
123 int ret;
124
125 if (strlen(buf) >= ISCSI_IQN_LEN) {
126 pr_err("Target IQN exceeds %d bytes\n",
127 ISCSI_IQN_LEN);
128 return ERR_PTR(-EINVAL);
129 }
130
131 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
132 if (!tiqn)
133 return ERR_PTR(-ENOMEM);
134
135 sprintf(tiqn->tiqn, "%s", buf);
136 INIT_LIST_HEAD(&tiqn->tiqn_list);
137 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
138 spin_lock_init(&tiqn->tiqn_state_lock);
139 spin_lock_init(&tiqn->tiqn_tpg_lock);
140 spin_lock_init(&tiqn->sess_err_stats.lock);
141 spin_lock_init(&tiqn->login_stats.lock);
142 spin_lock_init(&tiqn->logout_stats.lock);
143
144 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
145
146 idr_preload(GFP_KERNEL);
147 spin_lock(&tiqn_lock);
148
149 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
150 if (ret < 0) {
151 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
152 spin_unlock(&tiqn_lock);
153 idr_preload_end();
154 kfree(tiqn);
155 return ERR_PTR(ret);
156 }
157 tiqn->tiqn_index = ret;
158 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
159
160 spin_unlock(&tiqn_lock);
161 idr_preload_end();
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 spin_unlock_bh(&np->np_thread_lock);
220 /*
221 * Determine if the portal group is accepting storage traffic.
222 */
223 spin_lock_bh(&tpg->tpg_state_lock);
224 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
225 spin_unlock_bh(&tpg->tpg_state_lock);
226 return -1;
227 }
228 spin_unlock_bh(&tpg->tpg_state_lock);
229
230 /*
231 * Here we serialize access across the TIQN+TPG Tuple.
232 */
233 ret = down_interruptible(&tpg->np_login_sem);
234 if (ret != 0)
235 return -1;
236
237 spin_lock_bh(&tpg->tpg_state_lock);
238 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
239 spin_unlock_bh(&tpg->tpg_state_lock);
240 up(&tpg->np_login_sem);
241 return -1;
242 }
243 spin_unlock_bh(&tpg->tpg_state_lock);
244
245 return 0;
246 }
247
248 void iscsit_login_kref_put(struct kref *kref)
249 {
250 struct iscsi_tpg_np *tpg_np = container_of(kref,
251 struct iscsi_tpg_np, tpg_np_kref);
252
253 complete(&tpg_np->tpg_np_comp);
254 }
255
256 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
257 struct iscsi_tpg_np *tpg_np)
258 {
259 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
260
261 up(&tpg->np_login_sem);
262
263 if (tpg_np)
264 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
265
266 if (tiqn)
267 iscsit_put_tiqn_for_login(tiqn);
268
269 return 0;
270 }
271
272 bool iscsit_check_np_match(
273 struct sockaddr_storage *sockaddr,
274 struct iscsi_np *np,
275 int network_transport)
276 {
277 struct sockaddr_in *sock_in, *sock_in_e;
278 struct sockaddr_in6 *sock_in6, *sock_in6_e;
279 bool ip_match = false;
280 u16 port, port_e;
281
282 if (sockaddr->ss_family == AF_INET6) {
283 sock_in6 = (struct sockaddr_in6 *)sockaddr;
284 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
285
286 if (!memcmp(&sock_in6->sin6_addr.in6_u,
287 &sock_in6_e->sin6_addr.in6_u,
288 sizeof(struct in6_addr)))
289 ip_match = true;
290
291 port = ntohs(sock_in6->sin6_port);
292 port_e = ntohs(sock_in6_e->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 == sock_in_e->sin_addr.s_addr)
298 ip_match = true;
299
300 port = ntohs(sock_in->sin_port);
301 port_e = ntohs(sock_in_e->sin_port);
302 }
303
304 if (ip_match && (port_e == port) &&
305 (np->np_network_transport == network_transport))
306 return true;
307
308 return false;
309 }
310
311 static struct iscsi_np *iscsit_get_np(
312 struct sockaddr_storage *sockaddr,
313 int network_transport)
314 {
315 struct iscsi_np *np;
316 bool match;
317
318 lockdep_assert_held(&np_lock);
319
320 list_for_each_entry(np, &g_np_list, np_list) {
321 spin_lock_bh(&np->np_thread_lock);
322 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
323 spin_unlock_bh(&np->np_thread_lock);
324 continue;
325 }
326
327 match = iscsit_check_np_match(sockaddr, np, network_transport);
328 if (match) {
329 /*
330 * Increment the np_exports reference count now to
331 * prevent iscsit_del_np() below from being called
332 * while iscsi_tpg_add_network_portal() is called.
333 */
334 np->np_exports++;
335 spin_unlock_bh(&np->np_thread_lock);
336 return np;
337 }
338 spin_unlock_bh(&np->np_thread_lock);
339 }
340
341 return NULL;
342 }
343
344 struct iscsi_np *iscsit_add_np(
345 struct sockaddr_storage *sockaddr,
346 int network_transport)
347 {
348 struct iscsi_np *np;
349 int ret;
350
351 mutex_lock(&np_lock);
352
353 /*
354 * Locate the existing struct iscsi_np if already active..
355 */
356 np = iscsit_get_np(sockaddr, network_transport);
357 if (np) {
358 mutex_unlock(&np_lock);
359 return np;
360 }
361
362 np = kzalloc(sizeof(*np), GFP_KERNEL);
363 if (!np) {
364 mutex_unlock(&np_lock);
365 return ERR_PTR(-ENOMEM);
366 }
367
368 np->np_flags |= NPF_IP_NETWORK;
369 np->np_network_transport = network_transport;
370 spin_lock_init(&np->np_thread_lock);
371 init_completion(&np->np_restart_comp);
372 INIT_LIST_HEAD(&np->np_list);
373
374 timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
375
376 ret = iscsi_target_setup_login_socket(np, sockaddr);
377 if (ret != 0) {
378 kfree(np);
379 mutex_unlock(&np_lock);
380 return ERR_PTR(ret);
381 }
382
383 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
384 if (IS_ERR(np->np_thread)) {
385 pr_err("Unable to create kthread: iscsi_np\n");
386 ret = PTR_ERR(np->np_thread);
387 kfree(np);
388 mutex_unlock(&np_lock);
389 return ERR_PTR(ret);
390 }
391 /*
392 * Increment the np_exports reference count now to prevent
393 * iscsit_del_np() below from being run while a new call to
394 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
395 * active. We don't need to hold np->np_thread_lock at this
396 * point because iscsi_np has not been added to g_np_list yet.
397 */
398 np->np_exports = 1;
399 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
400
401 list_add_tail(&np->np_list, &g_np_list);
402 mutex_unlock(&np_lock);
403
404 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
405 &np->np_sockaddr, np->np_transport->name);
406
407 return np;
408 }
409
410 int iscsit_reset_np_thread(
411 struct iscsi_np *np,
412 struct iscsi_tpg_np *tpg_np,
413 struct iscsi_portal_group *tpg,
414 bool shutdown)
415 {
416 spin_lock_bh(&np->np_thread_lock);
417 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
418 spin_unlock_bh(&np->np_thread_lock);
419 return 0;
420 }
421 np->np_thread_state = ISCSI_NP_THREAD_RESET;
422 atomic_inc(&np->np_reset_count);
423
424 if (np->np_thread) {
425 spin_unlock_bh(&np->np_thread_lock);
426 send_sig(SIGINT, np->np_thread, 1);
427 wait_for_completion(&np->np_restart_comp);
428 spin_lock_bh(&np->np_thread_lock);
429 }
430 spin_unlock_bh(&np->np_thread_lock);
431
432 if (tpg_np && shutdown) {
433 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
434
435 wait_for_completion(&tpg_np->tpg_np_comp);
436 }
437
438 return 0;
439 }
440
441 static void iscsit_free_np(struct iscsi_np *np)
442 {
443 if (np->np_socket)
444 sock_release(np->np_socket);
445 }
446
447 int iscsit_del_np(struct iscsi_np *np)
448 {
449 spin_lock_bh(&np->np_thread_lock);
450 np->np_exports--;
451 if (np->np_exports) {
452 np->enabled = true;
453 spin_unlock_bh(&np->np_thread_lock);
454 return 0;
455 }
456 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
457 spin_unlock_bh(&np->np_thread_lock);
458
459 if (np->np_thread) {
460 /*
461 * We need to send the signal to wakeup Linux/Net
462 * which may be sleeping in sock_accept()..
463 */
464 send_sig(SIGINT, np->np_thread, 1);
465 kthread_stop(np->np_thread);
466 np->np_thread = NULL;
467 }
468
469 np->np_transport->iscsit_free_np(np);
470
471 mutex_lock(&np_lock);
472 list_del(&np->np_list);
473 mutex_unlock(&np_lock);
474
475 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
476 &np->np_sockaddr, np->np_transport->name);
477
478 iscsit_put_transport(np->np_transport);
479 kfree(np);
480 return 0;
481 }
482
483 static void iscsit_get_rx_pdu(struct iscsi_conn *);
484
485 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
486 {
487 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
488 }
489 EXPORT_SYMBOL(iscsit_queue_rsp);
490
491 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
492 {
493 spin_lock_bh(&conn->cmd_lock);
494 if (!list_empty(&cmd->i_conn_node) &&
495 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
496 list_del_init(&cmd->i_conn_node);
497 spin_unlock_bh(&conn->cmd_lock);
498
499 __iscsit_free_cmd(cmd, true);
500 }
501 EXPORT_SYMBOL(iscsit_aborted_task);
502
503 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
504 u32, u32, const void *, void *);
505 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
506
507 static int
508 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
509 const void *data_buf, u32 data_buf_len)
510 {
511 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
512 struct kvec *iov;
513 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
514 int ret;
515
516 iov = &cmd->iov_misc[0];
517 iov[niov].iov_base = cmd->pdu;
518 iov[niov++].iov_len = ISCSI_HDR_LEN;
519
520 if (conn->conn_ops->HeaderDigest) {
521 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
522
523 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
524 ISCSI_HDR_LEN, 0, NULL,
525 header_digest);
526
527 iov[0].iov_len += ISCSI_CRC_LEN;
528 tx_size += ISCSI_CRC_LEN;
529 pr_debug("Attaching CRC32C HeaderDigest"
530 " to opcode 0x%x 0x%08x\n",
531 hdr->opcode, *header_digest);
532 }
533
534 if (data_buf_len) {
535 u32 padding = ((-data_buf_len) & 3);
536
537 iov[niov].iov_base = (void *)data_buf;
538 iov[niov++].iov_len = data_buf_len;
539 tx_size += data_buf_len;
540
541 if (padding != 0) {
542 iov[niov].iov_base = &cmd->pad_bytes;
543 iov[niov++].iov_len = padding;
544 tx_size += padding;
545 pr_debug("Attaching %u additional"
546 " padding bytes.\n", padding);
547 }
548
549 if (conn->conn_ops->DataDigest) {
550 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
551 data_buf, data_buf_len,
552 padding, &cmd->pad_bytes,
553 &cmd->data_crc);
554
555 iov[niov].iov_base = &cmd->data_crc;
556 iov[niov++].iov_len = ISCSI_CRC_LEN;
557 tx_size += ISCSI_CRC_LEN;
558 pr_debug("Attached DataDigest for %u"
559 " bytes opcode 0x%x, CRC 0x%08x\n",
560 data_buf_len, hdr->opcode, cmd->data_crc);
561 }
562 }
563
564 cmd->iov_misc_count = niov;
565 cmd->tx_size = tx_size;
566
567 ret = iscsit_send_tx_data(cmd, conn, 1);
568 if (ret < 0) {
569 iscsit_tx_thread_wait_for_tcp(conn);
570 return ret;
571 }
572
573 return 0;
574 }
575
576 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
577 static void iscsit_unmap_iovec(struct iscsi_cmd *);
578 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
579 u32, u32, u32, u8 *);
580 static int
581 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
582 const struct iscsi_datain *datain)
583 {
584 struct kvec *iov;
585 u32 iov_count = 0, tx_size = 0;
586 int ret, iov_ret;
587
588 iov = &cmd->iov_data[0];
589 iov[iov_count].iov_base = cmd->pdu;
590 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
591 tx_size += ISCSI_HDR_LEN;
592
593 if (conn->conn_ops->HeaderDigest) {
594 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
595
596 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
597 ISCSI_HDR_LEN, 0, NULL,
598 header_digest);
599
600 iov[0].iov_len += ISCSI_CRC_LEN;
601 tx_size += ISCSI_CRC_LEN;
602
603 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
604 *header_digest);
605 }
606
607 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
608 datain->offset, datain->length);
609 if (iov_ret < 0)
610 return -1;
611
612 iov_count += iov_ret;
613 tx_size += datain->length;
614
615 cmd->padding = ((-datain->length) & 3);
616 if (cmd->padding) {
617 iov[iov_count].iov_base = cmd->pad_bytes;
618 iov[iov_count++].iov_len = cmd->padding;
619 tx_size += cmd->padding;
620
621 pr_debug("Attaching %u padding bytes\n", cmd->padding);
622 }
623
624 if (conn->conn_ops->DataDigest) {
625 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
626 cmd, datain->offset,
627 datain->length,
628 cmd->padding,
629 cmd->pad_bytes);
630
631 iov[iov_count].iov_base = &cmd->data_crc;
632 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
633 tx_size += ISCSI_CRC_LEN;
634
635 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
636 datain->length + cmd->padding, cmd->data_crc);
637 }
638
639 cmd->iov_data_count = iov_count;
640 cmd->tx_size = tx_size;
641
642 ret = iscsit_fe_sendpage_sg(cmd, conn);
643
644 iscsit_unmap_iovec(cmd);
645
646 if (ret < 0) {
647 iscsit_tx_thread_wait_for_tcp(conn);
648 return ret;
649 }
650
651 return 0;
652 }
653
654 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
655 struct iscsi_datain_req *dr, const void *buf,
656 u32 buf_len)
657 {
658 if (dr)
659 return iscsit_xmit_datain_pdu(conn, cmd, buf);
660 else
661 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
662 }
663
664 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
665 {
666 return TARGET_PROT_NORMAL;
667 }
668
669 static struct iscsit_transport iscsi_target_transport = {
670 .name = "iSCSI/TCP",
671 .transport_type = ISCSI_TCP,
672 .rdma_shutdown = false,
673 .owner = NULL,
674 .iscsit_setup_np = iscsit_setup_np,
675 .iscsit_accept_np = iscsit_accept_np,
676 .iscsit_free_np = iscsit_free_np,
677 .iscsit_get_login_rx = iscsit_get_login_rx,
678 .iscsit_put_login_tx = iscsit_put_login_tx,
679 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
680 .iscsit_immediate_queue = iscsit_immediate_queue,
681 .iscsit_response_queue = iscsit_response_queue,
682 .iscsit_queue_data_in = iscsit_queue_rsp,
683 .iscsit_queue_status = iscsit_queue_rsp,
684 .iscsit_aborted_task = iscsit_aborted_task,
685 .iscsit_xmit_pdu = iscsit_xmit_pdu,
686 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
687 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
688 };
689
690 static int __init iscsi_target_init_module(void)
691 {
692 int ret = 0, size;
693
694 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
695 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
696 if (!iscsit_global)
697 return -1;
698
699 spin_lock_init(&iscsit_global->ts_bitmap_lock);
700 mutex_init(&auth_id_lock);
701 idr_init(&tiqn_idr);
702
703 ret = target_register_template(&iscsi_ops);
704 if (ret)
705 goto out;
706
707 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
708 iscsit_global->ts_bitmap = vzalloc(size);
709 if (!iscsit_global->ts_bitmap)
710 goto configfs_out;
711
712 lio_qr_cache = kmem_cache_create("lio_qr_cache",
713 sizeof(struct iscsi_queue_req),
714 __alignof__(struct iscsi_queue_req), 0, NULL);
715 if (!lio_qr_cache) {
716 pr_err("Unable to kmem_cache_create() for"
717 " lio_qr_cache\n");
718 goto bitmap_out;
719 }
720
721 lio_dr_cache = kmem_cache_create("lio_dr_cache",
722 sizeof(struct iscsi_datain_req),
723 __alignof__(struct iscsi_datain_req), 0, NULL);
724 if (!lio_dr_cache) {
725 pr_err("Unable to kmem_cache_create() for"
726 " lio_dr_cache\n");
727 goto qr_out;
728 }
729
730 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
731 sizeof(struct iscsi_ooo_cmdsn),
732 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
733 if (!lio_ooo_cache) {
734 pr_err("Unable to kmem_cache_create() for"
735 " lio_ooo_cache\n");
736 goto dr_out;
737 }
738
739 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
740 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
741 0, NULL);
742 if (!lio_r2t_cache) {
743 pr_err("Unable to kmem_cache_create() for"
744 " lio_r2t_cache\n");
745 goto ooo_out;
746 }
747
748 iscsit_register_transport(&iscsi_target_transport);
749
750 if (iscsit_load_discovery_tpg() < 0)
751 goto r2t_out;
752
753 return ret;
754 r2t_out:
755 iscsit_unregister_transport(&iscsi_target_transport);
756 kmem_cache_destroy(lio_r2t_cache);
757 ooo_out:
758 kmem_cache_destroy(lio_ooo_cache);
759 dr_out:
760 kmem_cache_destroy(lio_dr_cache);
761 qr_out:
762 kmem_cache_destroy(lio_qr_cache);
763 bitmap_out:
764 vfree(iscsit_global->ts_bitmap);
765 configfs_out:
766 /* XXX: this probably wants it to be it's own unwind step.. */
767 if (iscsit_global->discovery_tpg)
768 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
769 target_unregister_template(&iscsi_ops);
770 out:
771 kfree(iscsit_global);
772 return -ENOMEM;
773 }
774
775 static void __exit iscsi_target_cleanup_module(void)
776 {
777 iscsit_release_discovery_tpg();
778 iscsit_unregister_transport(&iscsi_target_transport);
779 kmem_cache_destroy(lio_qr_cache);
780 kmem_cache_destroy(lio_dr_cache);
781 kmem_cache_destroy(lio_ooo_cache);
782 kmem_cache_destroy(lio_r2t_cache);
783
784 /*
785 * Shutdown discovery sessions and disable discovery TPG
786 */
787 if (iscsit_global->discovery_tpg)
788 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
789
790 target_unregister_template(&iscsi_ops);
791
792 vfree(iscsit_global->ts_bitmap);
793 kfree(iscsit_global);
794 }
795
796 int iscsit_add_reject(
797 struct iscsi_conn *conn,
798 u8 reason,
799 unsigned char *buf)
800 {
801 struct iscsi_cmd *cmd;
802
803 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
804 if (!cmd)
805 return -1;
806
807 cmd->iscsi_opcode = ISCSI_OP_REJECT;
808 cmd->reject_reason = reason;
809
810 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
811 if (!cmd->buf_ptr) {
812 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
813 iscsit_free_cmd(cmd, false);
814 return -1;
815 }
816
817 spin_lock_bh(&conn->cmd_lock);
818 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
819 spin_unlock_bh(&conn->cmd_lock);
820
821 cmd->i_state = ISTATE_SEND_REJECT;
822 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
823
824 return -1;
825 }
826 EXPORT_SYMBOL(iscsit_add_reject);
827
828 static int iscsit_add_reject_from_cmd(
829 struct iscsi_cmd *cmd,
830 u8 reason,
831 bool add_to_conn,
832 unsigned char *buf)
833 {
834 struct iscsi_conn *conn;
835 const bool do_put = cmd->se_cmd.se_tfo != NULL;
836
837 if (!cmd->conn) {
838 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
839 cmd->init_task_tag);
840 return -1;
841 }
842 conn = cmd->conn;
843
844 cmd->iscsi_opcode = ISCSI_OP_REJECT;
845 cmd->reject_reason = reason;
846
847 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
848 if (!cmd->buf_ptr) {
849 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
850 iscsit_free_cmd(cmd, false);
851 return -1;
852 }
853
854 if (add_to_conn) {
855 spin_lock_bh(&conn->cmd_lock);
856 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
857 spin_unlock_bh(&conn->cmd_lock);
858 }
859
860 cmd->i_state = ISTATE_SEND_REJECT;
861 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
862 /*
863 * Perform the kref_put now if se_cmd has already been setup by
864 * scsit_setup_scsi_cmd()
865 */
866 if (do_put) {
867 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
868 target_put_sess_cmd(&cmd->se_cmd);
869 }
870 return -1;
871 }
872
873 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
874 unsigned char *buf)
875 {
876 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
877 }
878
879 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
880 {
881 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
882 }
883 EXPORT_SYMBOL(iscsit_reject_cmd);
884
885 /*
886 * Map some portion of the allocated scatterlist to an iovec, suitable for
887 * kernel sockets to copy data in/out.
888 */
889 static int iscsit_map_iovec(
890 struct iscsi_cmd *cmd,
891 struct kvec *iov,
892 u32 data_offset,
893 u32 data_length)
894 {
895 u32 i = 0;
896 struct scatterlist *sg;
897 unsigned int page_off;
898
899 /*
900 * We know each entry in t_data_sg contains a page.
901 */
902 u32 ent = data_offset / PAGE_SIZE;
903
904 if (ent >= cmd->se_cmd.t_data_nents) {
905 pr_err("Initial page entry out-of-bounds\n");
906 return -1;
907 }
908
909 sg = &cmd->se_cmd.t_data_sg[ent];
910 page_off = (data_offset % PAGE_SIZE);
911
912 cmd->first_data_sg = sg;
913 cmd->first_data_sg_off = page_off;
914
915 while (data_length) {
916 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
917
918 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
919 iov[i].iov_len = cur_len;
920
921 data_length -= cur_len;
922 page_off = 0;
923 sg = sg_next(sg);
924 i++;
925 }
926
927 cmd->kmapped_nents = i;
928
929 return i;
930 }
931
932 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
933 {
934 u32 i;
935 struct scatterlist *sg;
936
937 sg = cmd->first_data_sg;
938
939 for (i = 0; i < cmd->kmapped_nents; i++)
940 kunmap(sg_page(&sg[i]));
941 }
942
943 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
944 {
945 LIST_HEAD(ack_list);
946 struct iscsi_cmd *cmd, *cmd_p;
947
948 conn->exp_statsn = exp_statsn;
949
950 if (conn->sess->sess_ops->RDMAExtensions)
951 return;
952
953 spin_lock_bh(&conn->cmd_lock);
954 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
955 spin_lock(&cmd->istate_lock);
956 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
957 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
958 cmd->i_state = ISTATE_REMOVE;
959 spin_unlock(&cmd->istate_lock);
960 list_move_tail(&cmd->i_conn_node, &ack_list);
961 continue;
962 }
963 spin_unlock(&cmd->istate_lock);
964 }
965 spin_unlock_bh(&conn->cmd_lock);
966
967 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
968 list_del_init(&cmd->i_conn_node);
969 iscsit_free_cmd(cmd, false);
970 }
971 }
972
973 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
974 {
975 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
976
977 iov_count += ISCSI_IOV_DATA_BUFFER;
978 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
979 if (!cmd->iov_data)
980 return -ENOMEM;
981
982 cmd->orig_iov_data_count = iov_count;
983 return 0;
984 }
985
986 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
987 unsigned char *buf)
988 {
989 int data_direction, payload_length;
990 struct iscsi_scsi_req *hdr;
991 int iscsi_task_attr;
992 int sam_task_attr;
993
994 atomic_long_inc(&conn->sess->cmd_pdus);
995
996 hdr = (struct iscsi_scsi_req *) buf;
997 payload_length = ntoh24(hdr->dlength);
998
999 /* FIXME; Add checks for AdditionalHeaderSegment */
1000
1001 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1002 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1003 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1004 " not set. Bad iSCSI Initiator.\n");
1005 return iscsit_add_reject_cmd(cmd,
1006 ISCSI_REASON_BOOKMARK_INVALID, buf);
1007 }
1008
1009 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1010 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1011 /*
1012 * From RFC-3720 Section 10.3.1:
1013 *
1014 * "Either or both of R and W MAY be 1 when either the
1015 * Expected Data Transfer Length and/or Bidirectional Read
1016 * Expected Data Transfer Length are 0"
1017 *
1018 * For this case, go ahead and clear the unnecssary bits
1019 * to avoid any confusion with ->data_direction.
1020 */
1021 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1022 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1023
1024 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1025 " set when Expected Data Transfer Length is 0 for"
1026 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1027 }
1028
1029 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1030 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1031 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1032 " MUST be set if Expected Data Transfer Length is not 0."
1033 " Bad iSCSI Initiator\n");
1034 return iscsit_add_reject_cmd(cmd,
1035 ISCSI_REASON_BOOKMARK_INVALID, buf);
1036 }
1037
1038 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1039 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1040 pr_err("Bidirectional operations not supported!\n");
1041 return iscsit_add_reject_cmd(cmd,
1042 ISCSI_REASON_BOOKMARK_INVALID, buf);
1043 }
1044
1045 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1046 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1047 " Scsi Command PDU.\n");
1048 return iscsit_add_reject_cmd(cmd,
1049 ISCSI_REASON_BOOKMARK_INVALID, buf);
1050 }
1051
1052 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1053 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1054 " protocol error.\n", payload_length);
1055 return iscsit_add_reject_cmd(cmd,
1056 ISCSI_REASON_PROTOCOL_ERROR, buf);
1057 }
1058
1059 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1060 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1061 pr_err("Expected Data Transfer Length and Length of"
1062 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1063 " bit is not set protocol error\n");
1064 return iscsit_add_reject_cmd(cmd,
1065 ISCSI_REASON_PROTOCOL_ERROR, buf);
1066 }
1067
1068 if (payload_length > be32_to_cpu(hdr->data_length)) {
1069 pr_err("DataSegmentLength: %u is greater than"
1070 " EDTL: %u, protocol error.\n", payload_length,
1071 hdr->data_length);
1072 return iscsit_add_reject_cmd(cmd,
1073 ISCSI_REASON_PROTOCOL_ERROR, buf);
1074 }
1075
1076 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1077 pr_err("DataSegmentLength: %u is greater than"
1078 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1079 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1080 return iscsit_add_reject_cmd(cmd,
1081 ISCSI_REASON_PROTOCOL_ERROR, buf);
1082 }
1083
1084 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1085 pr_err("DataSegmentLength: %u is greater than"
1086 " FirstBurstLength: %u, protocol error.\n",
1087 payload_length, conn->sess->sess_ops->FirstBurstLength);
1088 return iscsit_add_reject_cmd(cmd,
1089 ISCSI_REASON_BOOKMARK_INVALID, buf);
1090 }
1091
1092 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1093 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1094 DMA_NONE;
1095
1096 cmd->data_direction = data_direction;
1097 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1098 /*
1099 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1100 */
1101 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1102 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1103 sam_task_attr = TCM_SIMPLE_TAG;
1104 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1105 sam_task_attr = TCM_ORDERED_TAG;
1106 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1107 sam_task_attr = TCM_HEAD_TAG;
1108 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1109 sam_task_attr = TCM_ACA_TAG;
1110 else {
1111 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1112 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1113 sam_task_attr = TCM_SIMPLE_TAG;
1114 }
1115
1116 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1117 cmd->i_state = ISTATE_NEW_CMD;
1118 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1119 cmd->immediate_data = (payload_length) ? 1 : 0;
1120 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1121 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1122 if (cmd->unsolicited_data)
1123 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1124
1125 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1126 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1127 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1128 else
1129 cmd->targ_xfer_tag = 0xFFFFFFFF;
1130 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1131 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1132 cmd->first_burst_len = payload_length;
1133
1134 if (!conn->sess->sess_ops->RDMAExtensions &&
1135 cmd->data_direction == DMA_FROM_DEVICE) {
1136 struct iscsi_datain_req *dr;
1137
1138 dr = iscsit_allocate_datain_req();
1139 if (!dr)
1140 return iscsit_add_reject_cmd(cmd,
1141 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1142
1143 iscsit_attach_datain_req(cmd, dr);
1144 }
1145
1146 /*
1147 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1148 */
1149 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1150 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1151 cmd->data_direction, sam_task_attr,
1152 cmd->sense_buffer + 2);
1153
1154 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1155 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1156 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1157 conn->cid);
1158
1159 target_get_sess_cmd(&cmd->se_cmd, true);
1160
1161 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1162 scsilun_to_int(&hdr->lun));
1163 if (cmd->sense_reason)
1164 goto attach_cmd;
1165
1166 /* only used for printks or comparing with ->ref_task_tag */
1167 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1168 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1169 if (cmd->sense_reason) {
1170 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1171 return iscsit_add_reject_cmd(cmd,
1172 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1173 }
1174
1175 goto attach_cmd;
1176 }
1177
1178 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1179 return iscsit_add_reject_cmd(cmd,
1180 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1181 }
1182
1183 attach_cmd:
1184 spin_lock_bh(&conn->cmd_lock);
1185 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1186 spin_unlock_bh(&conn->cmd_lock);
1187 /*
1188 * Check if we need to delay processing because of ALUA
1189 * Active/NonOptimized primary access state..
1190 */
1191 core_alua_check_nonop_delay(&cmd->se_cmd);
1192
1193 return 0;
1194 }
1195 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1196
1197 void iscsit_set_unsolicited_dataout(struct iscsi_cmd *cmd)
1198 {
1199 iscsit_set_dataout_sequence_values(cmd);
1200
1201 spin_lock_bh(&cmd->dataout_timeout_lock);
1202 iscsit_start_dataout_timer(cmd, cmd->conn);
1203 spin_unlock_bh(&cmd->dataout_timeout_lock);
1204 }
1205 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout);
1206
1207 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1208 struct iscsi_scsi_req *hdr)
1209 {
1210 int cmdsn_ret = 0;
1211 /*
1212 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1213 * the Immediate Bit is not set, and no Immediate
1214 * Data is attached.
1215 *
1216 * A PDU/CmdSN carrying Immediate Data can only
1217 * be processed after the DataCRC has passed.
1218 * If the DataCRC fails, the CmdSN MUST NOT
1219 * be acknowledged. (See below)
1220 */
1221 if (!cmd->immediate_data) {
1222 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1223 (unsigned char *)hdr, hdr->cmdsn);
1224 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1225 return -1;
1226 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1227 target_put_sess_cmd(&cmd->se_cmd);
1228 return 0;
1229 }
1230 }
1231
1232 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1233
1234 /*
1235 * If no Immediate Data is attached, it's OK to return now.
1236 */
1237 if (!cmd->immediate_data) {
1238 if (!cmd->sense_reason && cmd->unsolicited_data)
1239 iscsit_set_unsolicited_dataout(cmd);
1240 if (!cmd->sense_reason)
1241 return 0;
1242
1243 target_put_sess_cmd(&cmd->se_cmd);
1244 return 0;
1245 }
1246
1247 /*
1248 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1249 * execution. These exceptions are processed in CmdSN order using
1250 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1251 */
1252 if (cmd->sense_reason)
1253 return 1;
1254 /*
1255 * Call directly into transport_generic_new_cmd() to perform
1256 * the backend memory allocation.
1257 */
1258 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1259 if (cmd->sense_reason)
1260 return 1;
1261
1262 return 0;
1263 }
1264 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1265
1266 static int
1267 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1268 bool dump_payload)
1269 {
1270 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1271 /*
1272 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1273 */
1274 if (dump_payload)
1275 goto after_immediate_data;
1276 /*
1277 * Check for underflow case where both EDTL and immediate data payload
1278 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1279 * already been set in target_cmd_size_check() as se_cmd->data_length.
1280 *
1281 * For this special case, fail the command and dump the immediate data
1282 * payload.
1283 */
1284 if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1285 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1286 goto after_immediate_data;
1287 }
1288
1289 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1290 cmd->first_burst_len);
1291 after_immediate_data:
1292 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1293 /*
1294 * A PDU/CmdSN carrying Immediate Data passed
1295 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1296 * Immediate Bit is not set.
1297 */
1298 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1299 (unsigned char *)hdr, hdr->cmdsn);
1300 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1301 return -1;
1302
1303 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1304 int rc;
1305
1306 rc = iscsit_dump_data_payload(cmd->conn,
1307 cmd->first_burst_len, 1);
1308 target_put_sess_cmd(&cmd->se_cmd);
1309 return rc;
1310 } else if (cmd->unsolicited_data)
1311 iscsit_set_unsolicited_dataout(cmd);
1312
1313 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1314 /*
1315 * Immediate Data failed DataCRC and ERL>=1,
1316 * silently drop this PDU and let the initiator
1317 * plug the CmdSN gap.
1318 *
1319 * FIXME: Send Unsolicited NOPIN with reserved
1320 * TTT here to help the initiator figure out
1321 * the missing CmdSN, although they should be
1322 * intelligent enough to determine the missing
1323 * CmdSN and issue a retry to plug the sequence.
1324 */
1325 cmd->i_state = ISTATE_REMOVE;
1326 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1327 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1328 return -1;
1329
1330 return 0;
1331 }
1332
1333 static int
1334 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1335 unsigned char *buf)
1336 {
1337 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1338 int rc, immed_data;
1339 bool dump_payload = false;
1340
1341 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1342 if (rc < 0)
1343 return 0;
1344 /*
1345 * Allocation iovecs needed for struct socket operations for
1346 * traditional iSCSI block I/O.
1347 */
1348 if (iscsit_allocate_iovecs(cmd) < 0) {
1349 return iscsit_reject_cmd(cmd,
1350 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1351 }
1352 immed_data = cmd->immediate_data;
1353
1354 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1355 if (rc < 0)
1356 return rc;
1357 else if (rc > 0)
1358 dump_payload = true;
1359
1360 if (!immed_data)
1361 return 0;
1362
1363 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1364 }
1365
1366 static u32 iscsit_do_crypto_hash_sg(
1367 struct ahash_request *hash,
1368 struct iscsi_cmd *cmd,
1369 u32 data_offset,
1370 u32 data_length,
1371 u32 padding,
1372 u8 *pad_bytes)
1373 {
1374 u32 data_crc;
1375 struct scatterlist *sg;
1376 unsigned int page_off;
1377
1378 crypto_ahash_init(hash);
1379
1380 sg = cmd->first_data_sg;
1381 page_off = cmd->first_data_sg_off;
1382
1383 while (data_length) {
1384 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1385
1386 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1387 crypto_ahash_update(hash);
1388
1389 data_length -= cur_len;
1390 page_off = 0;
1391 /* iscsit_map_iovec has already checked for invalid sg pointers */
1392 sg = sg_next(sg);
1393 }
1394
1395 if (padding) {
1396 struct scatterlist pad_sg;
1397
1398 sg_init_one(&pad_sg, pad_bytes, padding);
1399 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1400 padding);
1401 crypto_ahash_finup(hash);
1402 } else {
1403 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1404 crypto_ahash_final(hash);
1405 }
1406
1407 return data_crc;
1408 }
1409
1410 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1411 const void *buf, u32 payload_length, u32 padding,
1412 const void *pad_bytes, void *data_crc)
1413 {
1414 struct scatterlist sg[2];
1415
1416 sg_init_table(sg, ARRAY_SIZE(sg));
1417 sg_set_buf(sg, buf, payload_length);
1418 if (padding)
1419 sg_set_buf(sg + 1, pad_bytes, padding);
1420
1421 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1422
1423 crypto_ahash_digest(hash);
1424 }
1425
1426 int
1427 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1428 struct iscsi_cmd *cmd, u32 payload_length,
1429 bool *success)
1430 {
1431 struct iscsi_data *hdr = buf;
1432 struct se_cmd *se_cmd;
1433 int rc;
1434
1435 /* iSCSI write */
1436 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1437
1438 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1439 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1440 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1441 payload_length, conn->cid);
1442
1443 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1444 pr_err("Command ITT: 0x%08x received DataOUT after"
1445 " last DataOUT received, dumping payload\n",
1446 cmd->init_task_tag);
1447 return iscsit_dump_data_payload(conn, payload_length, 1);
1448 }
1449
1450 if (cmd->data_direction != DMA_TO_DEVICE) {
1451 pr_err("Command ITT: 0x%08x received DataOUT for a"
1452 " NON-WRITE command.\n", cmd->init_task_tag);
1453 return iscsit_dump_data_payload(conn, payload_length, 1);
1454 }
1455 se_cmd = &cmd->se_cmd;
1456 iscsit_mod_dataout_timer(cmd);
1457
1458 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1459 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1460 be32_to_cpu(hdr->offset), payload_length,
1461 cmd->se_cmd.data_length);
1462 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1463 }
1464
1465 if (cmd->unsolicited_data) {
1466 int dump_unsolicited_data = 0;
1467
1468 if (conn->sess->sess_ops->InitialR2T) {
1469 pr_err("Received unexpected unsolicited data"
1470 " while InitialR2T=Yes, protocol error.\n");
1471 transport_send_check_condition_and_sense(&cmd->se_cmd,
1472 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1473 return -1;
1474 }
1475 /*
1476 * Special case for dealing with Unsolicited DataOUT
1477 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1478 * failures;
1479 */
1480
1481 /* Something's amiss if we're not in WRITE_PENDING state... */
1482 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1483 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1484 dump_unsolicited_data = 1;
1485
1486 if (dump_unsolicited_data) {
1487 /*
1488 * Check if a delayed TASK_ABORTED status needs to
1489 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1490 * received with the unsolicited data out.
1491 */
1492 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1493 iscsit_stop_dataout_timer(cmd);
1494
1495 return iscsit_dump_data_payload(conn, payload_length, 1);
1496 }
1497 } else {
1498 /*
1499 * For the normal solicited data path:
1500 *
1501 * Check for a delayed TASK_ABORTED status and dump any
1502 * incoming data out payload if one exists. Also, when the
1503 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1504 * data out sequence, we decrement outstanding_r2ts. Once
1505 * outstanding_r2ts reaches zero, go ahead and send the delayed
1506 * TASK_ABORTED status.
1507 */
1508 if (se_cmd->transport_state & CMD_T_ABORTED) {
1509 if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1510 --cmd->outstanding_r2ts < 1)
1511 iscsit_stop_dataout_timer(cmd);
1512
1513 return iscsit_dump_data_payload(conn, payload_length, 1);
1514 }
1515 }
1516 /*
1517 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1518 * within-command recovery checks before receiving the payload.
1519 */
1520 rc = iscsit_check_pre_dataout(cmd, buf);
1521 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1522 return 0;
1523 else if (rc == DATAOUT_CANNOT_RECOVER)
1524 return -1;
1525 *success = true;
1526 return 0;
1527 }
1528 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1529
1530 int
1531 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1532 struct iscsi_cmd **out_cmd)
1533 {
1534 struct iscsi_data *hdr = buf;
1535 struct iscsi_cmd *cmd;
1536 u32 payload_length = ntoh24(hdr->dlength);
1537 int rc;
1538 bool success = false;
1539
1540 if (!payload_length) {
1541 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1542 return 0;
1543 }
1544
1545 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1546 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1547 " MaxXmitDataSegmentLength: %u\n", payload_length,
1548 conn->conn_ops->MaxXmitDataSegmentLength);
1549 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1550 }
1551
1552 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1553 if (!cmd)
1554 return 0;
1555
1556 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1557
1558 if (success)
1559 *out_cmd = cmd;
1560
1561 return rc;
1562 }
1563 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1564
1565 static int
1566 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1567 struct iscsi_data *hdr)
1568 {
1569 struct kvec *iov;
1570 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1571 u32 payload_length = ntoh24(hdr->dlength);
1572 int iov_ret, data_crc_failed = 0;
1573
1574 rx_size += payload_length;
1575 iov = &cmd->iov_data[0];
1576
1577 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1578 payload_length);
1579 if (iov_ret < 0)
1580 return -1;
1581
1582 iov_count += iov_ret;
1583
1584 padding = ((-payload_length) & 3);
1585 if (padding != 0) {
1586 iov[iov_count].iov_base = cmd->pad_bytes;
1587 iov[iov_count++].iov_len = padding;
1588 rx_size += padding;
1589 pr_debug("Receiving %u padding bytes.\n", padding);
1590 }
1591
1592 if (conn->conn_ops->DataDigest) {
1593 iov[iov_count].iov_base = &checksum;
1594 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1595 rx_size += ISCSI_CRC_LEN;
1596 }
1597
1598 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1599
1600 iscsit_unmap_iovec(cmd);
1601
1602 if (rx_got != rx_size)
1603 return -1;
1604
1605 if (conn->conn_ops->DataDigest) {
1606 u32 data_crc;
1607
1608 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1609 be32_to_cpu(hdr->offset),
1610 payload_length, padding,
1611 cmd->pad_bytes);
1612
1613 if (checksum != data_crc) {
1614 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1615 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1616 " does not match computed 0x%08x\n",
1617 hdr->itt, hdr->offset, payload_length,
1618 hdr->datasn, checksum, data_crc);
1619 data_crc_failed = 1;
1620 } else {
1621 pr_debug("Got CRC32C DataDigest 0x%08x for"
1622 " %u bytes of Data Out\n", checksum,
1623 payload_length);
1624 }
1625 }
1626
1627 return data_crc_failed;
1628 }
1629
1630 int
1631 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1632 bool data_crc_failed)
1633 {
1634 struct iscsi_conn *conn = cmd->conn;
1635 int rc, ooo_cmdsn;
1636 /*
1637 * Increment post receive data and CRC values or perform
1638 * within-command recovery.
1639 */
1640 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1641 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1642 return 0;
1643 else if (rc == DATAOUT_SEND_R2T) {
1644 iscsit_set_dataout_sequence_values(cmd);
1645 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1646 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1647 /*
1648 * Handle extra special case for out of order
1649 * Unsolicited Data Out.
1650 */
1651 spin_lock_bh(&cmd->istate_lock);
1652 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1653 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1654 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1655 spin_unlock_bh(&cmd->istate_lock);
1656
1657 iscsit_stop_dataout_timer(cmd);
1658 if (ooo_cmdsn)
1659 return 0;
1660 target_execute_cmd(&cmd->se_cmd);
1661 return 0;
1662 } else /* DATAOUT_CANNOT_RECOVER */
1663 return -1;
1664
1665 return 0;
1666 }
1667 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1668
1669 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1670 {
1671 struct iscsi_cmd *cmd = NULL;
1672 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1673 int rc;
1674 bool data_crc_failed = false;
1675
1676 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1677 if (rc < 0)
1678 return 0;
1679 else if (!cmd)
1680 return 0;
1681
1682 rc = iscsit_get_dataout(conn, cmd, hdr);
1683 if (rc < 0)
1684 return rc;
1685 else if (rc > 0)
1686 data_crc_failed = true;
1687
1688 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1689 }
1690
1691 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1692 struct iscsi_nopout *hdr)
1693 {
1694 u32 payload_length = ntoh24(hdr->dlength);
1695
1696 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1697 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1698 if (!cmd)
1699 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1700 (unsigned char *)hdr);
1701
1702 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1703 (unsigned char *)hdr);
1704 }
1705
1706 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1707 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1708 " not set, protocol error.\n");
1709 if (!cmd)
1710 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1711 (unsigned char *)hdr);
1712
1713 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1714 (unsigned char *)hdr);
1715 }
1716
1717 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1718 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1719 " greater than MaxXmitDataSegmentLength: %u, protocol"
1720 " error.\n", payload_length,
1721 conn->conn_ops->MaxXmitDataSegmentLength);
1722 if (!cmd)
1723 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1724 (unsigned char *)hdr);
1725
1726 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1727 (unsigned char *)hdr);
1728 }
1729
1730 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1731 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1732 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1733 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1734 payload_length);
1735 /*
1736 * This is not a response to a Unsolicited NopIN, which means
1737 * it can either be a NOPOUT ping request (with a valid ITT),
1738 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1739 * Either way, make sure we allocate an struct iscsi_cmd, as both
1740 * can contain ping data.
1741 */
1742 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1743 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1744 cmd->i_state = ISTATE_SEND_NOPIN;
1745 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1746 1 : 0);
1747 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1748 cmd->targ_xfer_tag = 0xFFFFFFFF;
1749 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1750 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1751 cmd->data_direction = DMA_NONE;
1752 }
1753
1754 return 0;
1755 }
1756 EXPORT_SYMBOL(iscsit_setup_nop_out);
1757
1758 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1759 struct iscsi_nopout *hdr)
1760 {
1761 struct iscsi_cmd *cmd_p = NULL;
1762 int cmdsn_ret = 0;
1763 /*
1764 * Initiator is expecting a NopIN ping reply..
1765 */
1766 if (hdr->itt != RESERVED_ITT) {
1767 if (!cmd)
1768 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1769 (unsigned char *)hdr);
1770
1771 spin_lock_bh(&conn->cmd_lock);
1772 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1773 spin_unlock_bh(&conn->cmd_lock);
1774
1775 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1776
1777 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1778 iscsit_add_cmd_to_response_queue(cmd, conn,
1779 cmd->i_state);
1780 return 0;
1781 }
1782
1783 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1784 (unsigned char *)hdr, hdr->cmdsn);
1785 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1786 return 0;
1787 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1788 return -1;
1789
1790 return 0;
1791 }
1792 /*
1793 * This was a response to a unsolicited NOPIN ping.
1794 */
1795 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1796 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1797 if (!cmd_p)
1798 return -EINVAL;
1799
1800 iscsit_stop_nopin_response_timer(conn);
1801
1802 cmd_p->i_state = ISTATE_REMOVE;
1803 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1804
1805 iscsit_start_nopin_timer(conn);
1806 return 0;
1807 }
1808 /*
1809 * Otherwise, initiator is not expecting a NOPIN is response.
1810 * Just ignore for now.
1811 */
1812
1813 if (cmd)
1814 iscsit_free_cmd(cmd, false);
1815
1816 return 0;
1817 }
1818 EXPORT_SYMBOL(iscsit_process_nop_out);
1819
1820 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1821 unsigned char *buf)
1822 {
1823 unsigned char *ping_data = NULL;
1824 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1825 struct kvec *iov = NULL;
1826 u32 payload_length = ntoh24(hdr->dlength);
1827 int ret;
1828
1829 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1830 if (ret < 0)
1831 return 0;
1832 /*
1833 * Handle NOP-OUT payload for traditional iSCSI sockets
1834 */
1835 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1836 u32 checksum, data_crc, padding = 0;
1837 int niov = 0, rx_got, rx_size = payload_length;
1838
1839 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1840 if (!ping_data) {
1841 ret = -1;
1842 goto out;
1843 }
1844
1845 iov = &cmd->iov_misc[0];
1846 iov[niov].iov_base = ping_data;
1847 iov[niov++].iov_len = payload_length;
1848
1849 padding = ((-payload_length) & 3);
1850 if (padding != 0) {
1851 pr_debug("Receiving %u additional bytes"
1852 " for padding.\n", padding);
1853 iov[niov].iov_base = &cmd->pad_bytes;
1854 iov[niov++].iov_len = padding;
1855 rx_size += padding;
1856 }
1857 if (conn->conn_ops->DataDigest) {
1858 iov[niov].iov_base = &checksum;
1859 iov[niov++].iov_len = ISCSI_CRC_LEN;
1860 rx_size += ISCSI_CRC_LEN;
1861 }
1862
1863 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1864 if (rx_got != rx_size) {
1865 ret = -1;
1866 goto out;
1867 }
1868
1869 if (conn->conn_ops->DataDigest) {
1870 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1871 payload_length, padding,
1872 cmd->pad_bytes, &data_crc);
1873
1874 if (checksum != data_crc) {
1875 pr_err("Ping data CRC32C DataDigest"
1876 " 0x%08x does not match computed 0x%08x\n",
1877 checksum, data_crc);
1878 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1879 pr_err("Unable to recover from"
1880 " NOPOUT Ping DataCRC failure while in"
1881 " ERL=0.\n");
1882 ret = -1;
1883 goto out;
1884 } else {
1885 /*
1886 * Silently drop this PDU and let the
1887 * initiator plug the CmdSN gap.
1888 */
1889 pr_debug("Dropping NOPOUT"
1890 " Command CmdSN: 0x%08x due to"
1891 " DataCRC error.\n", hdr->cmdsn);
1892 ret = 0;
1893 goto out;
1894 }
1895 } else {
1896 pr_debug("Got CRC32C DataDigest"
1897 " 0x%08x for %u bytes of ping data.\n",
1898 checksum, payload_length);
1899 }
1900 }
1901
1902 ping_data[payload_length] = '\0';
1903 /*
1904 * Attach ping data to struct iscsi_cmd->buf_ptr.
1905 */
1906 cmd->buf_ptr = ping_data;
1907 cmd->buf_ptr_size = payload_length;
1908
1909 pr_debug("Got %u bytes of NOPOUT ping"
1910 " data.\n", payload_length);
1911 pr_debug("Ping Data: \"%s\"\n", ping_data);
1912 }
1913
1914 return iscsit_process_nop_out(conn, cmd, hdr);
1915 out:
1916 if (cmd)
1917 iscsit_free_cmd(cmd, false);
1918
1919 kfree(ping_data);
1920 return ret;
1921 }
1922
1923 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1924 {
1925 switch (iscsi_tmf) {
1926 case ISCSI_TM_FUNC_ABORT_TASK:
1927 return TMR_ABORT_TASK;
1928 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1929 return TMR_ABORT_TASK_SET;
1930 case ISCSI_TM_FUNC_CLEAR_ACA:
1931 return TMR_CLEAR_ACA;
1932 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1933 return TMR_CLEAR_TASK_SET;
1934 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1935 return TMR_LUN_RESET;
1936 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1937 return TMR_TARGET_WARM_RESET;
1938 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1939 return TMR_TARGET_COLD_RESET;
1940 default:
1941 return TMR_UNKNOWN;
1942 }
1943 }
1944
1945 int
1946 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1947 unsigned char *buf)
1948 {
1949 struct se_tmr_req *se_tmr;
1950 struct iscsi_tmr_req *tmr_req;
1951 struct iscsi_tm *hdr;
1952 int out_of_order_cmdsn = 0, ret;
1953 u8 function, tcm_function = TMR_UNKNOWN;
1954
1955 hdr = (struct iscsi_tm *) buf;
1956 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1957 function = hdr->flags;
1958
1959 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1960 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1961 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1962 hdr->rtt, hdr->refcmdsn, conn->cid);
1963
1964 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1965 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1966 hdr->rtt != RESERVED_ITT)) {
1967 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1968 hdr->rtt = RESERVED_ITT;
1969 }
1970
1971 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1972 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1973 pr_err("Task Management Request TASK_REASSIGN not"
1974 " issued as immediate command, bad iSCSI Initiator"
1975 "implementation\n");
1976 return iscsit_add_reject_cmd(cmd,
1977 ISCSI_REASON_PROTOCOL_ERROR, buf);
1978 }
1979 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1980 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1981 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1982
1983 cmd->data_direction = DMA_NONE;
1984 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1985 if (!cmd->tmr_req) {
1986 return iscsit_add_reject_cmd(cmd,
1987 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1988 buf);
1989 }
1990
1991 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1992 conn->sess->se_sess, 0, DMA_NONE,
1993 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1994
1995 target_get_sess_cmd(&cmd->se_cmd, true);
1996
1997 /*
1998 * TASK_REASSIGN for ERL=2 / connection stays inside of
1999 * LIO-Target $FABRIC_MOD
2000 */
2001 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2002 tcm_function = iscsit_convert_tmf(function);
2003 if (tcm_function == TMR_UNKNOWN) {
2004 pr_err("Unknown iSCSI TMR Function:"
2005 " 0x%02x\n", function);
2006 return iscsit_add_reject_cmd(cmd,
2007 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2008 }
2009 }
2010 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2011 GFP_KERNEL);
2012 if (ret < 0)
2013 return iscsit_add_reject_cmd(cmd,
2014 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2015
2016 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2017
2018 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2019 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2020 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2021 cmd->init_task_tag = hdr->itt;
2022 cmd->targ_xfer_tag = 0xFFFFFFFF;
2023 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2024 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2025 se_tmr = cmd->se_cmd.se_tmr_req;
2026 tmr_req = cmd->tmr_req;
2027 /*
2028 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2029 */
2030 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2031 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2032 scsilun_to_int(&hdr->lun));
2033 if (ret < 0) {
2034 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2035 goto attach;
2036 }
2037 }
2038
2039 switch (function) {
2040 case ISCSI_TM_FUNC_ABORT_TASK:
2041 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2042 if (se_tmr->response)
2043 goto attach;
2044 break;
2045 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2046 case ISCSI_TM_FUNC_CLEAR_ACA:
2047 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2048 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2049 break;
2050 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2051 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2052 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2053 goto attach;
2054 }
2055 break;
2056 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2057 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2058 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2059 goto attach;
2060 }
2061 break;
2062 case ISCSI_TM_FUNC_TASK_REASSIGN:
2063 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2064 /*
2065 * Perform sanity checks on the ExpDataSN only if the
2066 * TASK_REASSIGN was successful.
2067 */
2068 if (se_tmr->response)
2069 break;
2070
2071 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2072 return iscsit_add_reject_cmd(cmd,
2073 ISCSI_REASON_BOOKMARK_INVALID, buf);
2074 break;
2075 default:
2076 pr_err("Unknown TMR function: 0x%02x, protocol"
2077 " error.\n", function);
2078 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2079 goto attach;
2080 }
2081
2082 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2083 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2084 se_tmr->call_transport = 1;
2085 attach:
2086 spin_lock_bh(&conn->cmd_lock);
2087 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2088 spin_unlock_bh(&conn->cmd_lock);
2089
2090 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2091 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2092 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2093 out_of_order_cmdsn = 1;
2094 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2095 target_put_sess_cmd(&cmd->se_cmd);
2096 return 0;
2097 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2098 return -1;
2099 }
2100 }
2101 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2102
2103 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2104 return 0;
2105 /*
2106 * Found the referenced task, send to transport for processing.
2107 */
2108 if (se_tmr->call_transport)
2109 return transport_generic_handle_tmr(&cmd->se_cmd);
2110
2111 /*
2112 * Could not find the referenced LUN, task, or Task Management
2113 * command not authorized or supported. Change state and
2114 * let the tx_thread send the response.
2115 *
2116 * For connection recovery, this is also the default action for
2117 * TMR TASK_REASSIGN.
2118 */
2119 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2120 target_put_sess_cmd(&cmd->se_cmd);
2121 return 0;
2122 }
2123 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2124
2125 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2126 int
2127 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2128 struct iscsi_text *hdr)
2129 {
2130 u32 payload_length = ntoh24(hdr->dlength);
2131
2132 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2133 pr_err("Unable to accept text parameter length: %u"
2134 "greater than MaxXmitDataSegmentLength %u.\n",
2135 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2136 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2137 (unsigned char *)hdr);
2138 }
2139
2140 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2141 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2142 pr_err("Multi sequence text commands currently not supported\n");
2143 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2144 (unsigned char *)hdr);
2145 }
2146
2147 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2148 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2149 hdr->exp_statsn, payload_length);
2150
2151 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2152 cmd->i_state = ISTATE_SEND_TEXTRSP;
2153 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2154 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2155 cmd->targ_xfer_tag = 0xFFFFFFFF;
2156 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2157 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2158 cmd->data_direction = DMA_NONE;
2159 kfree(cmd->text_in_ptr);
2160 cmd->text_in_ptr = NULL;
2161
2162 return 0;
2163 }
2164 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2165
2166 int
2167 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2168 struct iscsi_text *hdr)
2169 {
2170 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2171 int cmdsn_ret;
2172
2173 if (!text_in) {
2174 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2175 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2176 pr_err("Unable to locate text_in buffer for sendtargets"
2177 " discovery\n");
2178 goto reject;
2179 }
2180 goto empty_sendtargets;
2181 }
2182 if (strncmp("SendTargets", text_in, 11) != 0) {
2183 pr_err("Received Text Data that is not"
2184 " SendTargets, cannot continue.\n");
2185 goto reject;
2186 }
2187 text_ptr = strchr(text_in, '=');
2188 if (!text_ptr) {
2189 pr_err("No \"=\" separator found in Text Data,"
2190 " cannot continue.\n");
2191 goto reject;
2192 }
2193 if (!strncmp("=All", text_ptr, 4)) {
2194 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2195 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2196 !strncmp("=eui.", text_ptr, 5)) {
2197 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2198 } else {
2199 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2200 goto reject;
2201 }
2202
2203 spin_lock_bh(&conn->cmd_lock);
2204 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2205 spin_unlock_bh(&conn->cmd_lock);
2206
2207 empty_sendtargets:
2208 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2209
2210 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2211 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2212 (unsigned char *)hdr, hdr->cmdsn);
2213 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2214 return -1;
2215
2216 return 0;
2217 }
2218
2219 return iscsit_execute_cmd(cmd, 0);
2220
2221 reject:
2222 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2223 (unsigned char *)hdr);
2224 }
2225 EXPORT_SYMBOL(iscsit_process_text_cmd);
2226
2227 static int
2228 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2229 unsigned char *buf)
2230 {
2231 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2232 char *text_in = NULL;
2233 u32 payload_length = ntoh24(hdr->dlength);
2234 int rx_size, rc;
2235
2236 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2237 if (rc < 0)
2238 return 0;
2239
2240 rx_size = payload_length;
2241 if (payload_length) {
2242 u32 checksum = 0, data_crc = 0;
2243 u32 padding = 0;
2244 int niov = 0, rx_got;
2245 struct kvec iov[2];
2246
2247 rx_size = ALIGN(payload_length, 4);
2248 text_in = kzalloc(rx_size, GFP_KERNEL);
2249 if (!text_in)
2250 goto reject;
2251
2252 cmd->text_in_ptr = text_in;
2253
2254 memset(iov, 0, sizeof(iov));
2255 iov[niov].iov_base = text_in;
2256 iov[niov++].iov_len = rx_size;
2257
2258 padding = rx_size - payload_length;
2259 if (padding)
2260 pr_debug("Receiving %u additional bytes"
2261 " for padding.\n", padding);
2262 if (conn->conn_ops->DataDigest) {
2263 iov[niov].iov_base = &checksum;
2264 iov[niov++].iov_len = ISCSI_CRC_LEN;
2265 rx_size += ISCSI_CRC_LEN;
2266 }
2267
2268 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2269 if (rx_got != rx_size)
2270 goto reject;
2271
2272 if (conn->conn_ops->DataDigest) {
2273 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2274 text_in, rx_size, 0, NULL,
2275 &data_crc);
2276
2277 if (checksum != data_crc) {
2278 pr_err("Text data CRC32C DataDigest"
2279 " 0x%08x does not match computed"
2280 " 0x%08x\n", checksum, data_crc);
2281 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2282 pr_err("Unable to recover from"
2283 " Text Data digest failure while in"
2284 " ERL=0.\n");
2285 goto reject;
2286 } else {
2287 /*
2288 * Silently drop this PDU and let the
2289 * initiator plug the CmdSN gap.
2290 */
2291 pr_debug("Dropping Text"
2292 " Command CmdSN: 0x%08x due to"
2293 " DataCRC error.\n", hdr->cmdsn);
2294 kfree(text_in);
2295 return 0;
2296 }
2297 } else {
2298 pr_debug("Got CRC32C DataDigest"
2299 " 0x%08x for %u bytes of text data.\n",
2300 checksum, payload_length);
2301 }
2302 }
2303 text_in[payload_length - 1] = '\0';
2304 pr_debug("Successfully read %d bytes of text"
2305 " data.\n", payload_length);
2306 }
2307
2308 return iscsit_process_text_cmd(conn, cmd, hdr);
2309
2310 reject:
2311 kfree(cmd->text_in_ptr);
2312 cmd->text_in_ptr = NULL;
2313 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2314 }
2315
2316 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2317 {
2318 struct iscsi_conn *conn_p;
2319 struct iscsi_session *sess = conn->sess;
2320
2321 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2322 " for SID: %u.\n", conn->cid, conn->sess->sid);
2323
2324 atomic_set(&sess->session_logout, 1);
2325 atomic_set(&conn->conn_logout_remove, 1);
2326 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2327
2328 iscsit_inc_conn_usage_count(conn);
2329 iscsit_inc_session_usage_count(sess);
2330
2331 spin_lock_bh(&sess->conn_lock);
2332 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2333 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2334 continue;
2335
2336 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2337 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2338 }
2339 spin_unlock_bh(&sess->conn_lock);
2340
2341 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2342
2343 return 0;
2344 }
2345
2346 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2347 {
2348 struct iscsi_conn *l_conn;
2349 struct iscsi_session *sess = conn->sess;
2350
2351 pr_debug("Received logout request CLOSECONNECTION for CID:"
2352 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2353
2354 /*
2355 * A Logout Request with a CLOSECONNECTION reason code for a CID
2356 * can arrive on a connection with a differing CID.
2357 */
2358 if (conn->cid == cmd->logout_cid) {
2359 spin_lock_bh(&conn->state_lock);
2360 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2361 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2362
2363 atomic_set(&conn->conn_logout_remove, 1);
2364 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2365 iscsit_inc_conn_usage_count(conn);
2366
2367 spin_unlock_bh(&conn->state_lock);
2368 } else {
2369 /*
2370 * Handle all different cid CLOSECONNECTION requests in
2371 * iscsit_logout_post_handler_diffcid() as to give enough
2372 * time for any non immediate command's CmdSN to be
2373 * acknowledged on the connection in question.
2374 *
2375 * Here we simply make sure the CID is still around.
2376 */
2377 l_conn = iscsit_get_conn_from_cid(sess,
2378 cmd->logout_cid);
2379 if (!l_conn) {
2380 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2381 iscsit_add_cmd_to_response_queue(cmd, conn,
2382 cmd->i_state);
2383 return 0;
2384 }
2385
2386 iscsit_dec_conn_usage_count(l_conn);
2387 }
2388
2389 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2390
2391 return 0;
2392 }
2393
2394 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2395 {
2396 struct iscsi_session *sess = conn->sess;
2397
2398 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2399 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2400
2401 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2402 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2403 " while ERL!=2.\n");
2404 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2405 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2406 return 0;
2407 }
2408
2409 if (conn->cid == cmd->logout_cid) {
2410 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2411 " with CID: %hu on CID: %hu, implementation error.\n",
2412 cmd->logout_cid, conn->cid);
2413 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2414 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2415 return 0;
2416 }
2417
2418 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2419
2420 return 0;
2421 }
2422
2423 int
2424 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2425 unsigned char *buf)
2426 {
2427 int cmdsn_ret, logout_remove = 0;
2428 u8 reason_code = 0;
2429 struct iscsi_logout *hdr;
2430 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2431
2432 hdr = (struct iscsi_logout *) buf;
2433 reason_code = (hdr->flags & 0x7f);
2434
2435 if (tiqn) {
2436 spin_lock(&tiqn->logout_stats.lock);
2437 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2438 tiqn->logout_stats.normal_logouts++;
2439 else
2440 tiqn->logout_stats.abnormal_logouts++;
2441 spin_unlock(&tiqn->logout_stats.lock);
2442 }
2443
2444 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2445 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2446 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2447 hdr->cid, conn->cid);
2448
2449 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2450 pr_err("Received logout request on connection that"
2451 " is not in logged in state, ignoring request.\n");
2452 iscsit_free_cmd(cmd, false);
2453 return 0;
2454 }
2455
2456 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2457 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2458 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2459 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2460 cmd->targ_xfer_tag = 0xFFFFFFFF;
2461 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2462 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2463 cmd->logout_cid = be16_to_cpu(hdr->cid);
2464 cmd->logout_reason = reason_code;
2465 cmd->data_direction = DMA_NONE;
2466
2467 /*
2468 * We need to sleep in these cases (by returning 1) until the Logout
2469 * Response gets sent in the tx thread.
2470 */
2471 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2472 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2473 be16_to_cpu(hdr->cid) == conn->cid))
2474 logout_remove = 1;
2475
2476 spin_lock_bh(&conn->cmd_lock);
2477 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2478 spin_unlock_bh(&conn->cmd_lock);
2479
2480 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2481 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2482
2483 /*
2484 * Immediate commands are executed, well, immediately.
2485 * Non-Immediate Logout Commands are executed in CmdSN order.
2486 */
2487 if (cmd->immediate_cmd) {
2488 int ret = iscsit_execute_cmd(cmd, 0);
2489
2490 if (ret < 0)
2491 return ret;
2492 } else {
2493 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2494 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2495 logout_remove = 0;
2496 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2497 return -1;
2498 }
2499
2500 return logout_remove;
2501 }
2502 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2503
2504 int iscsit_handle_snack(
2505 struct iscsi_conn *conn,
2506 unsigned char *buf)
2507 {
2508 struct iscsi_snack *hdr;
2509
2510 hdr = (struct iscsi_snack *) buf;
2511 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2512
2513 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2514 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2515 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2516 hdr->begrun, hdr->runlength, conn->cid);
2517
2518 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2519 pr_err("Initiator sent SNACK request while in"
2520 " ErrorRecoveryLevel=0.\n");
2521 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2522 buf);
2523 }
2524 /*
2525 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2526 * call from inside iscsi_send_recovery_datain_or_r2t().
2527 */
2528 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2529 case 0:
2530 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2531 hdr->itt,
2532 be32_to_cpu(hdr->ttt),
2533 be32_to_cpu(hdr->begrun),
2534 be32_to_cpu(hdr->runlength));
2535 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2536 return iscsit_handle_status_snack(conn, hdr->itt,
2537 be32_to_cpu(hdr->ttt),
2538 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2539 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2540 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2541 be32_to_cpu(hdr->begrun),
2542 be32_to_cpu(hdr->runlength));
2543 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2544 /* FIXME: Support R-Data SNACK */
2545 pr_err("R-Data SNACK Not Supported.\n");
2546 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2547 buf);
2548 default:
2549 pr_err("Unknown SNACK type 0x%02x, protocol"
2550 " error.\n", hdr->flags & 0x0f);
2551 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2552 buf);
2553 }
2554
2555 return 0;
2556 }
2557 EXPORT_SYMBOL(iscsit_handle_snack);
2558
2559 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2560 {
2561 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2562 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2563 wait_for_completion_interruptible_timeout(
2564 &conn->rx_half_close_comp,
2565 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2566 }
2567 }
2568
2569 static int iscsit_handle_immediate_data(
2570 struct iscsi_cmd *cmd,
2571 struct iscsi_scsi_req *hdr,
2572 u32 length)
2573 {
2574 int iov_ret, rx_got = 0, rx_size = 0;
2575 u32 checksum, iov_count = 0, padding = 0;
2576 struct iscsi_conn *conn = cmd->conn;
2577 struct kvec *iov;
2578
2579 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2580 if (iov_ret < 0)
2581 return IMMEDIATE_DATA_CANNOT_RECOVER;
2582
2583 rx_size = length;
2584 iov_count = iov_ret;
2585 iov = &cmd->iov_data[0];
2586
2587 padding = ((-length) & 3);
2588 if (padding != 0) {
2589 iov[iov_count].iov_base = cmd->pad_bytes;
2590 iov[iov_count++].iov_len = padding;
2591 rx_size += padding;
2592 }
2593
2594 if (conn->conn_ops->DataDigest) {
2595 iov[iov_count].iov_base = &checksum;
2596 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2597 rx_size += ISCSI_CRC_LEN;
2598 }
2599
2600 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2601
2602 iscsit_unmap_iovec(cmd);
2603
2604 if (rx_got != rx_size) {
2605 iscsit_rx_thread_wait_for_tcp(conn);
2606 return IMMEDIATE_DATA_CANNOT_RECOVER;
2607 }
2608
2609 if (conn->conn_ops->DataDigest) {
2610 u32 data_crc;
2611
2612 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2613 cmd->write_data_done, length, padding,
2614 cmd->pad_bytes);
2615
2616 if (checksum != data_crc) {
2617 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2618 " does not match computed 0x%08x\n", checksum,
2619 data_crc);
2620
2621 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2622 pr_err("Unable to recover from"
2623 " Immediate Data digest failure while"
2624 " in ERL=0.\n");
2625 iscsit_reject_cmd(cmd,
2626 ISCSI_REASON_DATA_DIGEST_ERROR,
2627 (unsigned char *)hdr);
2628 return IMMEDIATE_DATA_CANNOT_RECOVER;
2629 } else {
2630 iscsit_reject_cmd(cmd,
2631 ISCSI_REASON_DATA_DIGEST_ERROR,
2632 (unsigned char *)hdr);
2633 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2634 }
2635 } else {
2636 pr_debug("Got CRC32C DataDigest 0x%08x for"
2637 " %u bytes of Immediate Data\n", checksum,
2638 length);
2639 }
2640 }
2641
2642 cmd->write_data_done += length;
2643
2644 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2645 spin_lock_bh(&cmd->istate_lock);
2646 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2647 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2648 spin_unlock_bh(&cmd->istate_lock);
2649 }
2650
2651 return IMMEDIATE_DATA_NORMAL_OPERATION;
2652 }
2653
2654 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2655 with active network interface */
2656 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2657 {
2658 struct iscsi_cmd *cmd;
2659 struct iscsi_conn *conn_p;
2660 bool found = false;
2661
2662 lockdep_assert_held(&conn->sess->conn_lock);
2663
2664 /*
2665 * Only send a Asynchronous Message on connections whos network
2666 * interface is still functional.
2667 */
2668 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2669 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2670 iscsit_inc_conn_usage_count(conn_p);
2671 found = true;
2672 break;
2673 }
2674 }
2675
2676 if (!found)
2677 return;
2678
2679 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2680 if (!cmd) {
2681 iscsit_dec_conn_usage_count(conn_p);
2682 return;
2683 }
2684
2685 cmd->logout_cid = conn->cid;
2686 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2687 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2688
2689 spin_lock_bh(&conn_p->cmd_lock);
2690 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2691 spin_unlock_bh(&conn_p->cmd_lock);
2692
2693 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2694 iscsit_dec_conn_usage_count(conn_p);
2695 }
2696
2697 static int iscsit_send_conn_drop_async_message(
2698 struct iscsi_cmd *cmd,
2699 struct iscsi_conn *conn)
2700 {
2701 struct iscsi_async *hdr;
2702
2703 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2704
2705 hdr = (struct iscsi_async *) cmd->pdu;
2706 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2707 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2708 cmd->init_task_tag = RESERVED_ITT;
2709 cmd->targ_xfer_tag = 0xFFFFFFFF;
2710 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2711 cmd->stat_sn = conn->stat_sn++;
2712 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2713 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2714 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2715 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2716 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2717 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2718 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2719
2720 pr_debug("Sending Connection Dropped Async Message StatSN:"
2721 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2722 cmd->logout_cid, conn->cid);
2723
2724 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2725 }
2726
2727 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2728 {
2729 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2730 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2731 wait_for_completion_interruptible_timeout(
2732 &conn->tx_half_close_comp,
2733 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2734 }
2735 }
2736
2737 void
2738 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2739 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2740 bool set_statsn)
2741 {
2742 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2743 hdr->flags = datain->flags;
2744 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2745 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2746 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2747 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2748 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2749 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2750 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2751 }
2752 }
2753 hton24(hdr->dlength, datain->length);
2754 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2755 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2756 (struct scsi_lun *)&hdr->lun);
2757 else
2758 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2759
2760 hdr->itt = cmd->init_task_tag;
2761
2762 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2763 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2764 else
2765 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2766 if (set_statsn)
2767 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2768 else
2769 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2770
2771 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2772 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2773 hdr->datasn = cpu_to_be32(datain->data_sn);
2774 hdr->offset = cpu_to_be32(datain->offset);
2775
2776 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2777 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2778 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2779 ntohl(hdr->offset), datain->length, conn->cid);
2780 }
2781 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2782
2783 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2784 {
2785 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2786 struct iscsi_datain datain;
2787 struct iscsi_datain_req *dr;
2788 int eodr = 0, ret;
2789 bool set_statsn = false;
2790
2791 memset(&datain, 0, sizeof(struct iscsi_datain));
2792 dr = iscsit_get_datain_values(cmd, &datain);
2793 if (!dr) {
2794 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2795 cmd->init_task_tag);
2796 return -1;
2797 }
2798 /*
2799 * Be paranoid and double check the logic for now.
2800 */
2801 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2802 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2803 " datain.length: %u exceeds cmd->data_length: %u\n",
2804 cmd->init_task_tag, datain.offset, datain.length,
2805 cmd->se_cmd.data_length);
2806 return -1;
2807 }
2808
2809 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2810 /*
2811 * Special case for successfully execution w/ both DATAIN
2812 * and Sense Data.
2813 */
2814 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2815 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2816 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2817 else {
2818 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2819 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2820 iscsit_increment_maxcmdsn(cmd, conn->sess);
2821 cmd->stat_sn = conn->stat_sn++;
2822 set_statsn = true;
2823 } else if (dr->dr_complete ==
2824 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2825 set_statsn = true;
2826 }
2827
2828 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2829
2830 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2831 if (ret < 0)
2832 return ret;
2833
2834 if (dr->dr_complete) {
2835 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2836 2 : 1;
2837 iscsit_free_datain_req(cmd, dr);
2838 }
2839
2840 return eodr;
2841 }
2842
2843 int
2844 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2845 struct iscsi_logout_rsp *hdr)
2846 {
2847 struct iscsi_conn *logout_conn = NULL;
2848 struct iscsi_conn_recovery *cr = NULL;
2849 struct iscsi_session *sess = conn->sess;
2850 /*
2851 * The actual shutting down of Sessions and/or Connections
2852 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2853 * is done in scsi_logout_post_handler().
2854 */
2855 switch (cmd->logout_reason) {
2856 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2857 pr_debug("iSCSI session logout successful, setting"
2858 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2859 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2860 break;
2861 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2862 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2863 break;
2864 /*
2865 * For CLOSECONNECTION logout requests carrying
2866 * a matching logout CID -> local CID, the reference
2867 * for the local CID will have been incremented in
2868 * iscsi_logout_closeconnection().
2869 *
2870 * For CLOSECONNECTION logout requests carrying
2871 * a different CID than the connection it arrived
2872 * on, the connection responding to cmd->logout_cid
2873 * is stopped in iscsit_logout_post_handler_diffcid().
2874 */
2875
2876 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2877 " successful.\n", cmd->logout_cid, conn->cid);
2878 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2879 break;
2880 case ISCSI_LOGOUT_REASON_RECOVERY:
2881 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2882 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2883 break;
2884 /*
2885 * If the connection is still active from our point of view
2886 * force connection recovery to occur.
2887 */
2888 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2889 cmd->logout_cid);
2890 if (logout_conn) {
2891 iscsit_connection_reinstatement_rcfr(logout_conn);
2892 iscsit_dec_conn_usage_count(logout_conn);
2893 }
2894
2895 cr = iscsit_get_inactive_connection_recovery_entry(
2896 conn->sess, cmd->logout_cid);
2897 if (!cr) {
2898 pr_err("Unable to locate CID: %hu for"
2899 " REMOVECONNFORRECOVERY Logout Request.\n",
2900 cmd->logout_cid);
2901 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2902 break;
2903 }
2904
2905 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2906
2907 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2908 " for recovery for CID: %hu on CID: %hu successful.\n",
2909 cmd->logout_cid, conn->cid);
2910 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2911 break;
2912 default:
2913 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2914 cmd->logout_reason);
2915 return -1;
2916 }
2917
2918 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2919 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2920 hdr->response = cmd->logout_response;
2921 hdr->itt = cmd->init_task_tag;
2922 cmd->stat_sn = conn->stat_sn++;
2923 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2924
2925 iscsit_increment_maxcmdsn(cmd, conn->sess);
2926 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2927 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2928
2929 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2930 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2931 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2932 cmd->logout_cid, conn->cid);
2933
2934 return 0;
2935 }
2936 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2937
2938 static int
2939 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2940 {
2941 int rc;
2942
2943 rc = iscsit_build_logout_rsp(cmd, conn,
2944 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2945 if (rc < 0)
2946 return rc;
2947
2948 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2949 }
2950
2951 void
2952 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2953 struct iscsi_nopin *hdr, bool nopout_response)
2954 {
2955 hdr->opcode = ISCSI_OP_NOOP_IN;
2956 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2957 hton24(hdr->dlength, cmd->buf_ptr_size);
2958 if (nopout_response)
2959 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2960 hdr->itt = cmd->init_task_tag;
2961 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2962 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2963 conn->stat_sn;
2964 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2965
2966 if (nopout_response)
2967 iscsit_increment_maxcmdsn(cmd, conn->sess);
2968
2969 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2970 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2971
2972 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2973 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2974 "Solicited" : "Unsolicited", cmd->init_task_tag,
2975 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2976 }
2977 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2978
2979 /*
2980 * Unsolicited NOPIN, either requesting a response or not.
2981 */
2982 static int iscsit_send_unsolicited_nopin(
2983 struct iscsi_cmd *cmd,
2984 struct iscsi_conn *conn,
2985 int want_response)
2986 {
2987 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2988 int ret;
2989
2990 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2991
2992 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2993 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2994
2995 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2996 if (ret < 0)
2997 return ret;
2998
2999 spin_lock_bh(&cmd->istate_lock);
3000 cmd->i_state = want_response ?
3001 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3002 spin_unlock_bh(&cmd->istate_lock);
3003
3004 return 0;
3005 }
3006
3007 static int
3008 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3009 {
3010 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3011
3012 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3013
3014 /*
3015 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3016 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3017 */
3018 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3019
3020 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3021 cmd->buf_ptr,
3022 cmd->buf_ptr_size);
3023 }
3024
3025 static int iscsit_send_r2t(
3026 struct iscsi_cmd *cmd,
3027 struct iscsi_conn *conn)
3028 {
3029 struct iscsi_r2t *r2t;
3030 struct iscsi_r2t_rsp *hdr;
3031 int ret;
3032
3033 r2t = iscsit_get_r2t_from_list(cmd);
3034 if (!r2t)
3035 return -1;
3036
3037 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3038 memset(hdr, 0, ISCSI_HDR_LEN);
3039 hdr->opcode = ISCSI_OP_R2T;
3040 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3041 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3042 (struct scsi_lun *)&hdr->lun);
3043 hdr->itt = cmd->init_task_tag;
3044 if (conn->conn_transport->iscsit_get_r2t_ttt)
3045 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3046 else
3047 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3048 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3049 hdr->statsn = cpu_to_be32(conn->stat_sn);
3050 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3051 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3052 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3053 hdr->data_offset = cpu_to_be32(r2t->offset);
3054 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3055
3056 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3057 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3058 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3059 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3060 r2t->offset, r2t->xfer_len, conn->cid);
3061
3062 spin_lock_bh(&cmd->r2t_lock);
3063 r2t->sent_r2t = 1;
3064 spin_unlock_bh(&cmd->r2t_lock);
3065
3066 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3067 if (ret < 0) {
3068 return ret;
3069 }
3070
3071 spin_lock_bh(&cmd->dataout_timeout_lock);
3072 iscsit_start_dataout_timer(cmd, conn);
3073 spin_unlock_bh(&cmd->dataout_timeout_lock);
3074
3075 return 0;
3076 }
3077
3078 /*
3079 * @recovery: If called from iscsi_task_reassign_complete_write() for
3080 * connection recovery.
3081 */
3082 int iscsit_build_r2ts_for_cmd(
3083 struct iscsi_conn *conn,
3084 struct iscsi_cmd *cmd,
3085 bool recovery)
3086 {
3087 int first_r2t = 1;
3088 u32 offset = 0, xfer_len = 0;
3089
3090 spin_lock_bh(&cmd->r2t_lock);
3091 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3092 spin_unlock_bh(&cmd->r2t_lock);
3093 return 0;
3094 }
3095
3096 if (conn->sess->sess_ops->DataSequenceInOrder &&
3097 !recovery)
3098 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3099
3100 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3101 if (conn->sess->sess_ops->DataSequenceInOrder) {
3102 offset = cmd->r2t_offset;
3103
3104 if (first_r2t && recovery) {
3105 int new_data_end = offset +
3106 conn->sess->sess_ops->MaxBurstLength -
3107 cmd->next_burst_len;
3108
3109 if (new_data_end > cmd->se_cmd.data_length)
3110 xfer_len = cmd->se_cmd.data_length - offset;
3111 else
3112 xfer_len =
3113 conn->sess->sess_ops->MaxBurstLength -
3114 cmd->next_burst_len;
3115 } else {
3116 int new_data_end = offset +
3117 conn->sess->sess_ops->MaxBurstLength;
3118
3119 if (new_data_end > cmd->se_cmd.data_length)
3120 xfer_len = cmd->se_cmd.data_length - offset;
3121 else
3122 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3123 }
3124 cmd->r2t_offset += xfer_len;
3125
3126 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3127 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3128 } else {
3129 struct iscsi_seq *seq;
3130
3131 seq = iscsit_get_seq_holder_for_r2t(cmd);
3132 if (!seq) {
3133 spin_unlock_bh(&cmd->r2t_lock);
3134 return -1;
3135 }
3136
3137 offset = seq->offset;
3138 xfer_len = seq->xfer_len;
3139
3140 if (cmd->seq_send_order == cmd->seq_count)
3141 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3142 }
3143 cmd->outstanding_r2ts++;
3144 first_r2t = 0;
3145
3146 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3147 spin_unlock_bh(&cmd->r2t_lock);
3148 return -1;
3149 }
3150
3151 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3152 break;
3153 }
3154 spin_unlock_bh(&cmd->r2t_lock);
3155
3156 return 0;
3157 }
3158 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3159
3160 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3161 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3162 {
3163 if (inc_stat_sn)
3164 cmd->stat_sn = conn->stat_sn++;
3165
3166 atomic_long_inc(&conn->sess->rsp_pdus);
3167
3168 memset(hdr, 0, ISCSI_HDR_LEN);
3169 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3170 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3171 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3172 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3173 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3174 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3175 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3176 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3177 }
3178 hdr->response = cmd->iscsi_response;
3179 hdr->cmd_status = cmd->se_cmd.scsi_status;
3180 hdr->itt = cmd->init_task_tag;
3181 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3182
3183 iscsit_increment_maxcmdsn(cmd, conn->sess);
3184 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3185 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3186
3187 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3188 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3189 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3190 cmd->se_cmd.scsi_status, conn->cid);
3191 }
3192 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3193
3194 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3195 {
3196 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3197 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3198 void *data_buf = NULL;
3199 u32 padding = 0, data_buf_len = 0;
3200
3201 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3202
3203 /*
3204 * Attach SENSE DATA payload to iSCSI Response PDU
3205 */
3206 if (cmd->se_cmd.sense_buffer &&
3207 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3208 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3209 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3210 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3211
3212 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3213 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3214 data_buf = cmd->sense_buffer;
3215 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3216
3217 if (padding) {
3218 memset(cmd->sense_buffer +
3219 cmd->se_cmd.scsi_sense_length, 0, padding);
3220 pr_debug("Adding %u bytes of padding to"
3221 " SENSE.\n", padding);
3222 }
3223
3224 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3225 " Response PDU\n",
3226 cmd->se_cmd.scsi_sense_length);
3227 }
3228
3229 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3230 data_buf_len);
3231 }
3232
3233 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3234 {
3235 switch (se_tmr->response) {
3236 case TMR_FUNCTION_COMPLETE:
3237 return ISCSI_TMF_RSP_COMPLETE;
3238 case TMR_TASK_DOES_NOT_EXIST:
3239 return ISCSI_TMF_RSP_NO_TASK;
3240 case TMR_LUN_DOES_NOT_EXIST:
3241 return ISCSI_TMF_RSP_NO_LUN;
3242 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3243 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3244 case TMR_FUNCTION_REJECTED:
3245 default:
3246 return ISCSI_TMF_RSP_REJECTED;
3247 }
3248 }
3249
3250 void
3251 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3252 struct iscsi_tm_rsp *hdr)
3253 {
3254 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3255
3256 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3257 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3258 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3259 hdr->itt = cmd->init_task_tag;
3260 cmd->stat_sn = conn->stat_sn++;
3261 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3262
3263 iscsit_increment_maxcmdsn(cmd, conn->sess);
3264 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3265 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3266
3267 pr_debug("Built Task Management Response ITT: 0x%08x,"
3268 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3269 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3270 }
3271 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3272
3273 static int
3274 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3275 {
3276 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3277
3278 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3279
3280 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3281 }
3282
3283 #define SENDTARGETS_BUF_LIMIT 32768U
3284
3285 static int
3286 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3287 enum iscsit_transport_type network_transport,
3288 int skip_bytes, bool *completed)
3289 {
3290 char *payload = NULL;
3291 struct iscsi_conn *conn = cmd->conn;
3292 struct iscsi_portal_group *tpg;
3293 struct iscsi_tiqn *tiqn;
3294 struct iscsi_tpg_np *tpg_np;
3295 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3296 int target_name_printed;
3297 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3298 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3299 bool active;
3300
3301 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3302 SENDTARGETS_BUF_LIMIT);
3303
3304 payload = kzalloc(buffer_len, GFP_KERNEL);
3305 if (!payload)
3306 return -ENOMEM;
3307
3308 /*
3309 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3310 * explicit case..
3311 */
3312 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3313 text_ptr = strchr(text_in, '=');
3314 if (!text_ptr) {
3315 pr_err("Unable to locate '=' string in text_in:"
3316 " %s\n", text_in);
3317 kfree(payload);
3318 return -EINVAL;
3319 }
3320 /*
3321 * Skip over '=' character..
3322 */
3323 text_ptr += 1;
3324 }
3325
3326 spin_lock(&tiqn_lock);
3327 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3328 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3329 strcmp(tiqn->tiqn, text_ptr)) {
3330 continue;
3331 }
3332
3333 target_name_printed = 0;
3334
3335 spin_lock(&tiqn->tiqn_tpg_lock);
3336 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3337
3338 /* If demo_mode_discovery=0 and generate_node_acls=0
3339 * (demo mode dislabed) do not return
3340 * TargetName+TargetAddress unless a NodeACL exists.
3341 */
3342
3343 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3344 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3345 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3346 cmd->conn->sess->sess_ops->InitiatorName))) {
3347 continue;
3348 }
3349
3350 spin_lock(&tpg->tpg_state_lock);
3351 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3352 spin_unlock(&tpg->tpg_state_lock);
3353
3354 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3355 continue;
3356
3357 spin_lock(&tpg->tpg_np_lock);
3358 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3359 tpg_np_list) {
3360 struct iscsi_np *np = tpg_np->tpg_np;
3361 struct sockaddr_storage *sockaddr;
3362
3363 if (np->np_network_transport != network_transport)
3364 continue;
3365
3366 if (!target_name_printed) {
3367 len = sprintf(buf, "TargetName=%s",
3368 tiqn->tiqn);
3369 len += 1;
3370
3371 if ((len + payload_len) > buffer_len) {
3372 spin_unlock(&tpg->tpg_np_lock);
3373 spin_unlock(&tiqn->tiqn_tpg_lock);
3374 end_of_buf = 1;
3375 goto eob;
3376 }
3377
3378 if (skip_bytes && len <= skip_bytes) {
3379 skip_bytes -= len;
3380 } else {
3381 memcpy(payload + payload_len, buf, len);
3382 payload_len += len;
3383 target_name_printed = 1;
3384 if (len > skip_bytes)
3385 skip_bytes = 0;
3386 }
3387 }
3388
3389 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3390 sockaddr = &conn->local_sockaddr;
3391 else
3392 sockaddr = &np->np_sockaddr;
3393
3394 len = sprintf(buf, "TargetAddress="
3395 "%pISpc,%hu",
3396 sockaddr,
3397 tpg->tpgt);
3398 len += 1;
3399
3400 if ((len + payload_len) > buffer_len) {
3401 spin_unlock(&tpg->tpg_np_lock);
3402 spin_unlock(&tiqn->tiqn_tpg_lock);
3403 end_of_buf = 1;
3404 goto eob;
3405 }
3406
3407 if (skip_bytes && len <= skip_bytes) {
3408 skip_bytes -= len;
3409 } else {
3410 memcpy(payload + payload_len, buf, len);
3411 payload_len += len;
3412 if (len > skip_bytes)
3413 skip_bytes = 0;
3414 }
3415 }
3416 spin_unlock(&tpg->tpg_np_lock);
3417 }
3418 spin_unlock(&tiqn->tiqn_tpg_lock);
3419 eob:
3420 if (end_of_buf) {
3421 *completed = false;
3422 break;
3423 }
3424
3425 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3426 break;
3427 }
3428 spin_unlock(&tiqn_lock);
3429
3430 cmd->buf_ptr = payload;
3431
3432 return payload_len;
3433 }
3434
3435 int
3436 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3437 struct iscsi_text_rsp *hdr,
3438 enum iscsit_transport_type network_transport)
3439 {
3440 int text_length, padding;
3441 bool completed = true;
3442
3443 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3444 cmd->read_data_done,
3445 &completed);
3446 if (text_length < 0)
3447 return text_length;
3448
3449 if (completed) {
3450 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3451 } else {
3452 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3453 cmd->read_data_done += text_length;
3454 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3455 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3456 }
3457 hdr->opcode = ISCSI_OP_TEXT_RSP;
3458 padding = ((-text_length) & 3);
3459 hton24(hdr->dlength, text_length);
3460 hdr->itt = cmd->init_task_tag;
3461 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3462 cmd->stat_sn = conn->stat_sn++;
3463 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3464
3465 iscsit_increment_maxcmdsn(cmd, conn->sess);
3466 /*
3467 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3468 * correctly increment MaxCmdSN for each response answering a
3469 * non immediate text request with a valid CmdSN.
3470 */
3471 cmd->maxcmdsn_inc = 0;
3472 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3473 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3474
3475 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3476 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3477 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3478 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3479 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3480
3481 return text_length + padding;
3482 }
3483 EXPORT_SYMBOL(iscsit_build_text_rsp);
3484
3485 static int iscsit_send_text_rsp(
3486 struct iscsi_cmd *cmd,
3487 struct iscsi_conn *conn)
3488 {
3489 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3490 int text_length;
3491
3492 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3493 conn->conn_transport->transport_type);
3494 if (text_length < 0)
3495 return text_length;
3496
3497 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3498 cmd->buf_ptr,
3499 text_length);
3500 }
3501
3502 void
3503 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3504 struct iscsi_reject *hdr)
3505 {
3506 hdr->opcode = ISCSI_OP_REJECT;
3507 hdr->reason = cmd->reject_reason;
3508 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3509 hton24(hdr->dlength, ISCSI_HDR_LEN);
3510 hdr->ffffffff = cpu_to_be32(0xffffffff);
3511 cmd->stat_sn = conn->stat_sn++;
3512 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3513 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3514 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3515
3516 }
3517 EXPORT_SYMBOL(iscsit_build_reject);
3518
3519 static int iscsit_send_reject(
3520 struct iscsi_cmd *cmd,
3521 struct iscsi_conn *conn)
3522 {
3523 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3524
3525 iscsit_build_reject(cmd, conn, hdr);
3526
3527 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3528 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3529
3530 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3531 cmd->buf_ptr,
3532 ISCSI_HDR_LEN);
3533 }
3534
3535 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3536 {
3537 int ord, cpu;
3538 /*
3539 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3540 * within iscsit_start_kthreads()
3541 *
3542 * Here we use bitmap_id to determine which CPU that this
3543 * iSCSI connection's RX/TX threads will be scheduled to
3544 * execute upon.
3545 */
3546 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3547 for_each_online_cpu(cpu) {
3548 if (ord-- == 0) {
3549 cpumask_set_cpu(cpu, conn->conn_cpumask);
3550 return;
3551 }
3552 }
3553 /*
3554 * This should never be reached..
3555 */
3556 dump_stack();
3557 cpumask_setall(conn->conn_cpumask);
3558 }
3559
3560 int
3561 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3562 {
3563 int ret;
3564
3565 switch (state) {
3566 case ISTATE_SEND_R2T:
3567 ret = iscsit_send_r2t(cmd, conn);
3568 if (ret < 0)
3569 goto err;
3570 break;
3571 case ISTATE_REMOVE:
3572 spin_lock_bh(&conn->cmd_lock);
3573 list_del_init(&cmd->i_conn_node);
3574 spin_unlock_bh(&conn->cmd_lock);
3575
3576 iscsit_free_cmd(cmd, false);
3577 break;
3578 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3579 iscsit_mod_nopin_response_timer(conn);
3580 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3581 if (ret < 0)
3582 goto err;
3583 break;
3584 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3585 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3586 if (ret < 0)
3587 goto err;
3588 break;
3589 default:
3590 pr_err("Unknown Opcode: 0x%02x ITT:"
3591 " 0x%08x, i_state: %d on CID: %hu\n",
3592 cmd->iscsi_opcode, cmd->init_task_tag, state,
3593 conn->cid);
3594 goto err;
3595 }
3596
3597 return 0;
3598
3599 err:
3600 return -1;
3601 }
3602 EXPORT_SYMBOL(iscsit_immediate_queue);
3603
3604 static int
3605 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3606 {
3607 struct iscsit_transport *t = conn->conn_transport;
3608 struct iscsi_queue_req *qr;
3609 struct iscsi_cmd *cmd;
3610 u8 state;
3611 int ret;
3612
3613 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3614 atomic_set(&conn->check_immediate_queue, 0);
3615 cmd = qr->cmd;
3616 state = qr->state;
3617 kmem_cache_free(lio_qr_cache, qr);
3618
3619 ret = t->iscsit_immediate_queue(conn, cmd, state);
3620 if (ret < 0)
3621 return ret;
3622 }
3623
3624 return 0;
3625 }
3626
3627 int
3628 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3629 {
3630 int ret;
3631
3632 check_rsp_state:
3633 switch (state) {
3634 case ISTATE_SEND_DATAIN:
3635 ret = iscsit_send_datain(cmd, conn);
3636 if (ret < 0)
3637 goto err;
3638 else if (!ret)
3639 /* more drs */
3640 goto check_rsp_state;
3641 else if (ret == 1) {
3642 /* all done */
3643 spin_lock_bh(&cmd->istate_lock);
3644 cmd->i_state = ISTATE_SENT_STATUS;
3645 spin_unlock_bh(&cmd->istate_lock);
3646
3647 if (atomic_read(&conn->check_immediate_queue))
3648 return 1;
3649
3650 return 0;
3651 } else if (ret == 2) {
3652 /* Still must send status,
3653 SCF_TRANSPORT_TASK_SENSE was set */
3654 spin_lock_bh(&cmd->istate_lock);
3655 cmd->i_state = ISTATE_SEND_STATUS;
3656 spin_unlock_bh(&cmd->istate_lock);
3657 state = ISTATE_SEND_STATUS;
3658 goto check_rsp_state;
3659 }
3660
3661 break;
3662 case ISTATE_SEND_STATUS:
3663 case ISTATE_SEND_STATUS_RECOVERY:
3664 ret = iscsit_send_response(cmd, conn);
3665 break;
3666 case ISTATE_SEND_LOGOUTRSP:
3667 ret = iscsit_send_logout(cmd, conn);
3668 break;
3669 case ISTATE_SEND_ASYNCMSG:
3670 ret = iscsit_send_conn_drop_async_message(
3671 cmd, conn);
3672 break;
3673 case ISTATE_SEND_NOPIN:
3674 ret = iscsit_send_nopin(cmd, conn);
3675 break;
3676 case ISTATE_SEND_REJECT:
3677 ret = iscsit_send_reject(cmd, conn);
3678 break;
3679 case ISTATE_SEND_TASKMGTRSP:
3680 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3681 if (ret != 0)
3682 break;
3683 ret = iscsit_tmr_post_handler(cmd, conn);
3684 if (ret != 0)
3685 iscsit_fall_back_to_erl0(conn->sess);
3686 break;
3687 case ISTATE_SEND_TEXTRSP:
3688 ret = iscsit_send_text_rsp(cmd, conn);
3689 break;
3690 default:
3691 pr_err("Unknown Opcode: 0x%02x ITT:"
3692 " 0x%08x, i_state: %d on CID: %hu\n",
3693 cmd->iscsi_opcode, cmd->init_task_tag,
3694 state, conn->cid);
3695 goto err;
3696 }
3697 if (ret < 0)
3698 goto err;
3699
3700 switch (state) {
3701 case ISTATE_SEND_LOGOUTRSP:
3702 if (!iscsit_logout_post_handler(cmd, conn))
3703 return -ECONNRESET;
3704 /* fall through */
3705 case ISTATE_SEND_STATUS:
3706 case ISTATE_SEND_ASYNCMSG:
3707 case ISTATE_SEND_NOPIN:
3708 case ISTATE_SEND_STATUS_RECOVERY:
3709 case ISTATE_SEND_TEXTRSP:
3710 case ISTATE_SEND_TASKMGTRSP:
3711 case ISTATE_SEND_REJECT:
3712 spin_lock_bh(&cmd->istate_lock);
3713 cmd->i_state = ISTATE_SENT_STATUS;
3714 spin_unlock_bh(&cmd->istate_lock);
3715 break;
3716 default:
3717 pr_err("Unknown Opcode: 0x%02x ITT:"
3718 " 0x%08x, i_state: %d on CID: %hu\n",
3719 cmd->iscsi_opcode, cmd->init_task_tag,
3720 cmd->i_state, conn->cid);
3721 goto err;
3722 }
3723
3724 if (atomic_read(&conn->check_immediate_queue))
3725 return 1;
3726
3727 return 0;
3728
3729 err:
3730 return -1;
3731 }
3732 EXPORT_SYMBOL(iscsit_response_queue);
3733
3734 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3735 {
3736 struct iscsit_transport *t = conn->conn_transport;
3737 struct iscsi_queue_req *qr;
3738 struct iscsi_cmd *cmd;
3739 u8 state;
3740 int ret;
3741
3742 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3743 cmd = qr->cmd;
3744 state = qr->state;
3745 kmem_cache_free(lio_qr_cache, qr);
3746
3747 ret = t->iscsit_response_queue(conn, cmd, state);
3748 if (ret == 1 || ret < 0)
3749 return ret;
3750 }
3751
3752 return 0;
3753 }
3754
3755 int iscsi_target_tx_thread(void *arg)
3756 {
3757 int ret = 0;
3758 struct iscsi_conn *conn = arg;
3759 bool conn_freed = false;
3760
3761 /*
3762 * Allow ourselves to be interrupted by SIGINT so that a
3763 * connection recovery / failure event can be triggered externally.
3764 */
3765 allow_signal(SIGINT);
3766
3767 while (!kthread_should_stop()) {
3768 /*
3769 * Ensure that both TX and RX per connection kthreads
3770 * are scheduled to run on the same CPU.
3771 */
3772 iscsit_thread_check_cpumask(conn, current, 1);
3773
3774 wait_event_interruptible(conn->queues_wq,
3775 !iscsit_conn_all_queues_empty(conn));
3776
3777 if (signal_pending(current))
3778 goto transport_err;
3779
3780 get_immediate:
3781 ret = iscsit_handle_immediate_queue(conn);
3782 if (ret < 0)
3783 goto transport_err;
3784
3785 ret = iscsit_handle_response_queue(conn);
3786 if (ret == 1) {
3787 goto get_immediate;
3788 } else if (ret == -ECONNRESET) {
3789 conn_freed = true;
3790 goto out;
3791 } else if (ret < 0) {
3792 goto transport_err;
3793 }
3794 }
3795
3796 transport_err:
3797 /*
3798 * Avoid the normal connection failure code-path if this connection
3799 * is still within LOGIN mode, and iscsi_np process context is
3800 * responsible for cleaning up the early connection failure.
3801 */
3802 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3803 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3804 out:
3805 if (!conn_freed) {
3806 while (!kthread_should_stop()) {
3807 msleep(100);
3808 }
3809 }
3810 return 0;
3811 }
3812
3813 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3814 {
3815 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3816 struct iscsi_cmd *cmd;
3817 int ret = 0;
3818
3819 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3820 case ISCSI_OP_SCSI_CMD:
3821 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3822 if (!cmd)
3823 goto reject;
3824
3825 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3826 break;
3827 case ISCSI_OP_SCSI_DATA_OUT:
3828 ret = iscsit_handle_data_out(conn, buf);
3829 break;
3830 case ISCSI_OP_NOOP_OUT:
3831 cmd = NULL;
3832 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3833 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3834 if (!cmd)
3835 goto reject;
3836 }
3837 ret = iscsit_handle_nop_out(conn, cmd, buf);
3838 break;
3839 case ISCSI_OP_SCSI_TMFUNC:
3840 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3841 if (!cmd)
3842 goto reject;
3843
3844 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3845 break;
3846 case ISCSI_OP_TEXT:
3847 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3848 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3849 if (!cmd)
3850 goto reject;
3851 } else {
3852 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3853 if (!cmd)
3854 goto reject;
3855 }
3856
3857 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3858 break;
3859 case ISCSI_OP_LOGOUT:
3860 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3861 if (!cmd)
3862 goto reject;
3863
3864 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3865 if (ret > 0)
3866 wait_for_completion_timeout(&conn->conn_logout_comp,
3867 SECONDS_FOR_LOGOUT_COMP * HZ);
3868 break;
3869 case ISCSI_OP_SNACK:
3870 ret = iscsit_handle_snack(conn, buf);
3871 break;
3872 default:
3873 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3874 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3875 pr_err("Cannot recover from unknown"
3876 " opcode while ERL=0, closing iSCSI connection.\n");
3877 return -1;
3878 }
3879 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3880 " closing iSCSI connection.\n");
3881 ret = -1;
3882 break;
3883 }
3884
3885 return ret;
3886 reject:
3887 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3888 }
3889
3890 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3891 {
3892 bool ret;
3893
3894 spin_lock_bh(&conn->state_lock);
3895 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3896 spin_unlock_bh(&conn->state_lock);
3897
3898 return ret;
3899 }
3900
3901 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3902 {
3903 int ret;
3904 u8 *buffer, opcode;
3905 u32 checksum = 0, digest = 0;
3906 struct kvec iov;
3907
3908 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3909 if (!buffer)
3910 return;
3911
3912 while (!kthread_should_stop()) {
3913 /*
3914 * Ensure that both TX and RX per connection kthreads
3915 * are scheduled to run on the same CPU.
3916 */
3917 iscsit_thread_check_cpumask(conn, current, 0);
3918
3919 memset(&iov, 0, sizeof(struct kvec));
3920
3921 iov.iov_base = buffer;
3922 iov.iov_len = ISCSI_HDR_LEN;
3923
3924 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3925 if (ret != ISCSI_HDR_LEN) {
3926 iscsit_rx_thread_wait_for_tcp(conn);
3927 break;
3928 }
3929
3930 if (conn->conn_ops->HeaderDigest) {
3931 iov.iov_base = &digest;
3932 iov.iov_len = ISCSI_CRC_LEN;
3933
3934 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3935 if (ret != ISCSI_CRC_LEN) {
3936 iscsit_rx_thread_wait_for_tcp(conn);
3937 break;
3938 }
3939
3940 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3941 ISCSI_HDR_LEN, 0, NULL,
3942 &checksum);
3943
3944 if (digest != checksum) {
3945 pr_err("HeaderDigest CRC32C failed,"
3946 " received 0x%08x, computed 0x%08x\n",
3947 digest, checksum);
3948 /*
3949 * Set the PDU to 0xff so it will intentionally
3950 * hit default in the switch below.
3951 */
3952 memset(buffer, 0xff, ISCSI_HDR_LEN);
3953 atomic_long_inc(&conn->sess->conn_digest_errors);
3954 } else {
3955 pr_debug("Got HeaderDigest CRC32C"
3956 " 0x%08x\n", checksum);
3957 }
3958 }
3959
3960 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3961 break;
3962
3963 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3964
3965 if (conn->sess->sess_ops->SessionType &&
3966 ((!(opcode & ISCSI_OP_TEXT)) ||
3967 (!(opcode & ISCSI_OP_LOGOUT)))) {
3968 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3969 " while in Discovery Session, rejecting.\n", opcode);
3970 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
3971 buffer);
3972 break;
3973 }
3974
3975 ret = iscsi_target_rx_opcode(conn, buffer);
3976 if (ret < 0)
3977 break;
3978 }
3979
3980 kfree(buffer);
3981 }
3982
3983 int iscsi_target_rx_thread(void *arg)
3984 {
3985 int rc;
3986 struct iscsi_conn *conn = arg;
3987 bool conn_freed = false;
3988
3989 /*
3990 * Allow ourselves to be interrupted by SIGINT so that a
3991 * connection recovery / failure event can be triggered externally.
3992 */
3993 allow_signal(SIGINT);
3994 /*
3995 * Wait for iscsi_post_login_handler() to complete before allowing
3996 * incoming iscsi/tcp socket I/O, and/or failing the connection.
3997 */
3998 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
3999 if (rc < 0 || iscsi_target_check_conn_state(conn))
4000 goto out;
4001
4002 if (!conn->conn_transport->iscsit_get_rx_pdu)
4003 return 0;
4004
4005 conn->conn_transport->iscsit_get_rx_pdu(conn);
4006
4007 if (!signal_pending(current))
4008 atomic_set(&conn->transport_failed, 1);
4009 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4010
4011 out:
4012 if (!conn_freed) {
4013 while (!kthread_should_stop()) {
4014 msleep(100);
4015 }
4016 }
4017
4018 return 0;
4019 }
4020
4021 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4022 {
4023 LIST_HEAD(tmp_list);
4024 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4025 struct iscsi_session *sess = conn->sess;
4026 /*
4027 * We expect this function to only ever be called from either RX or TX
4028 * thread context via iscsit_close_connection() once the other context
4029 * has been reset -> returned sleeping pre-handler state.
4030 */
4031 spin_lock_bh(&conn->cmd_lock);
4032 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4033
4034 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4035 struct se_cmd *se_cmd = &cmd->se_cmd;
4036
4037 if (se_cmd->se_tfo != NULL) {
4038 spin_lock_irq(&se_cmd->t_state_lock);
4039 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4040 spin_unlock_irq(&se_cmd->t_state_lock);
4041 }
4042 }
4043 spin_unlock_bh(&conn->cmd_lock);
4044
4045 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4046 list_del_init(&cmd->i_conn_node);
4047
4048 iscsit_increment_maxcmdsn(cmd, sess);
4049 iscsit_free_cmd(cmd, true);
4050
4051 }
4052 }
4053
4054 static void iscsit_stop_timers_for_cmds(
4055 struct iscsi_conn *conn)
4056 {
4057 struct iscsi_cmd *cmd;
4058
4059 spin_lock_bh(&conn->cmd_lock);
4060 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4061 if (cmd->data_direction == DMA_TO_DEVICE)
4062 iscsit_stop_dataout_timer(cmd);
4063 }
4064 spin_unlock_bh(&conn->cmd_lock);
4065 }
4066
4067 int iscsit_close_connection(
4068 struct iscsi_conn *conn)
4069 {
4070 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4071 struct iscsi_session *sess = conn->sess;
4072
4073 pr_debug("Closing iSCSI connection CID %hu on SID:"
4074 " %u\n", conn->cid, sess->sid);
4075 /*
4076 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4077 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4078 * sleeping and the logout response never got sent because the
4079 * connection failed.
4080 *
4081 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4082 * to signal logout response TX interrupt completion. Go ahead and skip
4083 * this for iser since isert_rx_opcode() does not wait on logout failure,
4084 * and to avoid iscsi_conn pointer dereference in iser-target code.
4085 */
4086 if (!conn->conn_transport->rdma_shutdown)
4087 complete(&conn->conn_logout_comp);
4088
4089 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4090 if (conn->tx_thread &&
4091 cmpxchg(&conn->tx_thread_active, true, false)) {
4092 send_sig(SIGINT, conn->tx_thread, 1);
4093 kthread_stop(conn->tx_thread);
4094 }
4095 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4096 if (conn->rx_thread &&
4097 cmpxchg(&conn->rx_thread_active, true, false)) {
4098 send_sig(SIGINT, conn->rx_thread, 1);
4099 kthread_stop(conn->rx_thread);
4100 }
4101 }
4102
4103 spin_lock(&iscsit_global->ts_bitmap_lock);
4104 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4105 get_order(1));
4106 spin_unlock(&iscsit_global->ts_bitmap_lock);
4107
4108 iscsit_stop_timers_for_cmds(conn);
4109 iscsit_stop_nopin_response_timer(conn);
4110 iscsit_stop_nopin_timer(conn);
4111
4112 if (conn->conn_transport->iscsit_wait_conn)
4113 conn->conn_transport->iscsit_wait_conn(conn);
4114
4115 /*
4116 * During Connection recovery drop unacknowledged out of order
4117 * commands for this connection, and prepare the other commands
4118 * for reallegiance.
4119 *
4120 * During normal operation clear the out of order commands (but
4121 * do not free the struct iscsi_ooo_cmdsn's) and release all
4122 * struct iscsi_cmds.
4123 */
4124 if (atomic_read(&conn->connection_recovery)) {
4125 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4126 iscsit_prepare_cmds_for_reallegiance(conn);
4127 } else {
4128 iscsit_clear_ooo_cmdsns_for_conn(conn);
4129 iscsit_release_commands_from_conn(conn);
4130 }
4131 iscsit_free_queue_reqs_for_conn(conn);
4132
4133 /*
4134 * Handle decrementing session or connection usage count if
4135 * a logout response was not able to be sent because the
4136 * connection failed. Fall back to Session Recovery here.
4137 */
4138 if (atomic_read(&conn->conn_logout_remove)) {
4139 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4140 iscsit_dec_conn_usage_count(conn);
4141 iscsit_dec_session_usage_count(sess);
4142 }
4143 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4144 iscsit_dec_conn_usage_count(conn);
4145
4146 atomic_set(&conn->conn_logout_remove, 0);
4147 atomic_set(&sess->session_reinstatement, 0);
4148 atomic_set(&sess->session_fall_back_to_erl0, 1);
4149 }
4150
4151 spin_lock_bh(&sess->conn_lock);
4152 list_del(&conn->conn_list);
4153
4154 /*
4155 * Attempt to let the Initiator know this connection failed by
4156 * sending an Connection Dropped Async Message on another
4157 * active connection.
4158 */
4159 if (atomic_read(&conn->connection_recovery))
4160 iscsit_build_conn_drop_async_message(conn);
4161
4162 spin_unlock_bh(&sess->conn_lock);
4163
4164 /*
4165 * If connection reinstatement is being performed on this connection,
4166 * up the connection reinstatement semaphore that is being blocked on
4167 * in iscsit_cause_connection_reinstatement().
4168 */
4169 spin_lock_bh(&conn->state_lock);
4170 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4171 spin_unlock_bh(&conn->state_lock);
4172 complete(&conn->conn_wait_comp);
4173 wait_for_completion(&conn->conn_post_wait_comp);
4174 spin_lock_bh(&conn->state_lock);
4175 }
4176
4177 /*
4178 * If connection reinstatement is being performed on this connection
4179 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4180 * connection wait rcfr semaphore that is being blocked on
4181 * an iscsit_connection_reinstatement_rcfr().
4182 */
4183 if (atomic_read(&conn->connection_wait_rcfr)) {
4184 spin_unlock_bh(&conn->state_lock);
4185 complete(&conn->conn_wait_rcfr_comp);
4186 wait_for_completion(&conn->conn_post_wait_comp);
4187 spin_lock_bh(&conn->state_lock);
4188 }
4189 atomic_set(&conn->connection_reinstatement, 1);
4190 spin_unlock_bh(&conn->state_lock);
4191
4192 /*
4193 * If any other processes are accessing this connection pointer we
4194 * must wait until they have completed.
4195 */
4196 iscsit_check_conn_usage_count(conn);
4197
4198 ahash_request_free(conn->conn_tx_hash);
4199 if (conn->conn_rx_hash) {
4200 struct crypto_ahash *tfm;
4201
4202 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4203 ahash_request_free(conn->conn_rx_hash);
4204 crypto_free_ahash(tfm);
4205 }
4206
4207 if (conn->sock)
4208 sock_release(conn->sock);
4209
4210 if (conn->conn_transport->iscsit_free_conn)
4211 conn->conn_transport->iscsit_free_conn(conn);
4212
4213 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4214 conn->conn_state = TARG_CONN_STATE_FREE;
4215 iscsit_free_conn(conn);
4216
4217 spin_lock_bh(&sess->conn_lock);
4218 atomic_dec(&sess->nconn);
4219 pr_debug("Decremented iSCSI connection count to %hu from node:"
4220 " %s\n", atomic_read(&sess->nconn),
4221 sess->sess_ops->InitiatorName);
4222 /*
4223 * Make sure that if one connection fails in an non ERL=2 iSCSI
4224 * Session that they all fail.
4225 */
4226 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4227 !atomic_read(&sess->session_logout))
4228 atomic_set(&sess->session_fall_back_to_erl0, 1);
4229
4230 /*
4231 * If this was not the last connection in the session, and we are
4232 * performing session reinstatement or falling back to ERL=0, call
4233 * iscsit_stop_session() without sleeping to shutdown the other
4234 * active connections.
4235 */
4236 if (atomic_read(&sess->nconn)) {
4237 if (!atomic_read(&sess->session_reinstatement) &&
4238 !atomic_read(&sess->session_fall_back_to_erl0)) {
4239 spin_unlock_bh(&sess->conn_lock);
4240 return 0;
4241 }
4242 if (!atomic_read(&sess->session_stop_active)) {
4243 atomic_set(&sess->session_stop_active, 1);
4244 spin_unlock_bh(&sess->conn_lock);
4245 iscsit_stop_session(sess, 0, 0);
4246 return 0;
4247 }
4248 spin_unlock_bh(&sess->conn_lock);
4249 return 0;
4250 }
4251
4252 /*
4253 * If this was the last connection in the session and one of the
4254 * following is occurring:
4255 *
4256 * Session Reinstatement is not being performed, and are falling back
4257 * to ERL=0 call iscsit_close_session().
4258 *
4259 * Session Logout was requested. iscsit_close_session() will be called
4260 * elsewhere.
4261 *
4262 * Session Continuation is not being performed, start the Time2Retain
4263 * handler and check if sleep_on_sess_wait_sem is active.
4264 */
4265 if (!atomic_read(&sess->session_reinstatement) &&
4266 atomic_read(&sess->session_fall_back_to_erl0)) {
4267 spin_unlock_bh(&sess->conn_lock);
4268 iscsit_close_session(sess);
4269
4270 return 0;
4271 } else if (atomic_read(&sess->session_logout)) {
4272 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4273 sess->session_state = TARG_SESS_STATE_FREE;
4274 spin_unlock_bh(&sess->conn_lock);
4275
4276 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4277 complete(&sess->session_wait_comp);
4278
4279 return 0;
4280 } else {
4281 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4282 sess->session_state = TARG_SESS_STATE_FAILED;
4283
4284 if (!atomic_read(&sess->session_continuation)) {
4285 spin_unlock_bh(&sess->conn_lock);
4286 iscsit_start_time2retain_handler(sess);
4287 } else
4288 spin_unlock_bh(&sess->conn_lock);
4289
4290 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4291 complete(&sess->session_wait_comp);
4292
4293 return 0;
4294 }
4295 }
4296
4297 /*
4298 * If the iSCSI Session for the iSCSI Initiator Node exists,
4299 * forcefully shutdown the iSCSI NEXUS.
4300 */
4301 int iscsit_close_session(struct iscsi_session *sess)
4302 {
4303 struct iscsi_portal_group *tpg = sess->tpg;
4304 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4305
4306 if (atomic_read(&sess->nconn)) {
4307 pr_err("%d connection(s) still exist for iSCSI session"
4308 " to %s\n", atomic_read(&sess->nconn),
4309 sess->sess_ops->InitiatorName);
4310 BUG();
4311 }
4312
4313 spin_lock_bh(&se_tpg->session_lock);
4314 atomic_set(&sess->session_logout, 1);
4315 atomic_set(&sess->session_reinstatement, 1);
4316 iscsit_stop_time2retain_timer(sess);
4317 spin_unlock_bh(&se_tpg->session_lock);
4318
4319 /*
4320 * transport_deregister_session_configfs() will clear the
4321 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4322 * can be setting it again with __transport_register_session() in
4323 * iscsi_post_login_handler() again after the iscsit_stop_session()
4324 * completes in iscsi_np context.
4325 */
4326 transport_deregister_session_configfs(sess->se_sess);
4327
4328 /*
4329 * If any other processes are accessing this session pointer we must
4330 * wait until they have completed. If we are in an interrupt (the
4331 * time2retain handler) and contain and active session usage count we
4332 * restart the timer and exit.
4333 */
4334 if (!in_interrupt()) {
4335 if (iscsit_check_session_usage_count(sess) == 1)
4336 iscsit_stop_session(sess, 1, 1);
4337 } else {
4338 if (iscsit_check_session_usage_count(sess) == 2) {
4339 atomic_set(&sess->session_logout, 0);
4340 iscsit_start_time2retain_handler(sess);
4341 return 0;
4342 }
4343 }
4344
4345 transport_deregister_session(sess->se_sess);
4346
4347 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4348 iscsit_free_connection_recovery_entries(sess);
4349
4350 iscsit_free_all_ooo_cmdsns(sess);
4351
4352 spin_lock_bh(&se_tpg->session_lock);
4353 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4354 sess->session_state = TARG_SESS_STATE_FREE;
4355 pr_debug("Released iSCSI session from node: %s\n",
4356 sess->sess_ops->InitiatorName);
4357 tpg->nsessions--;
4358 if (tpg->tpg_tiqn)
4359 tpg->tpg_tiqn->tiqn_nsessions--;
4360
4361 pr_debug("Decremented number of active iSCSI Sessions on"
4362 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4363
4364 ida_free(&sess_ida, sess->session_index);
4365 kfree(sess->sess_ops);
4366 sess->sess_ops = NULL;
4367 spin_unlock_bh(&se_tpg->session_lock);
4368
4369 kfree(sess);
4370 return 0;
4371 }
4372
4373 static void iscsit_logout_post_handler_closesession(
4374 struct iscsi_conn *conn)
4375 {
4376 struct iscsi_session *sess = conn->sess;
4377 int sleep = 1;
4378 /*
4379 * Traditional iscsi/tcp will invoke this logic from TX thread
4380 * context during session logout, so clear tx_thread_active and
4381 * sleep if iscsit_close_connection() has not already occured.
4382 *
4383 * Since iser-target invokes this logic from it's own workqueue,
4384 * always sleep waiting for RX/TX thread shutdown to complete
4385 * within iscsit_close_connection().
4386 */
4387 if (!conn->conn_transport->rdma_shutdown) {
4388 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4389 if (!sleep)
4390 return;
4391 }
4392
4393 atomic_set(&conn->conn_logout_remove, 0);
4394 complete(&conn->conn_logout_comp);
4395
4396 iscsit_dec_conn_usage_count(conn);
4397 iscsit_stop_session(sess, sleep, sleep);
4398 iscsit_dec_session_usage_count(sess);
4399 iscsit_close_session(sess);
4400 }
4401
4402 static void iscsit_logout_post_handler_samecid(
4403 struct iscsi_conn *conn)
4404 {
4405 int sleep = 1;
4406
4407 if (!conn->conn_transport->rdma_shutdown) {
4408 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4409 if (!sleep)
4410 return;
4411 }
4412
4413 atomic_set(&conn->conn_logout_remove, 0);
4414 complete(&conn->conn_logout_comp);
4415
4416 iscsit_cause_connection_reinstatement(conn, sleep);
4417 iscsit_dec_conn_usage_count(conn);
4418 }
4419
4420 static void iscsit_logout_post_handler_diffcid(
4421 struct iscsi_conn *conn,
4422 u16 cid)
4423 {
4424 struct iscsi_conn *l_conn;
4425 struct iscsi_session *sess = conn->sess;
4426 bool conn_found = false;
4427
4428 if (!sess)
4429 return;
4430
4431 spin_lock_bh(&sess->conn_lock);
4432 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4433 if (l_conn->cid == cid) {
4434 iscsit_inc_conn_usage_count(l_conn);
4435 conn_found = true;
4436 break;
4437 }
4438 }
4439 spin_unlock_bh(&sess->conn_lock);
4440
4441 if (!conn_found)
4442 return;
4443
4444 if (l_conn->sock)
4445 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4446
4447 spin_lock_bh(&l_conn->state_lock);
4448 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4449 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4450 spin_unlock_bh(&l_conn->state_lock);
4451
4452 iscsit_cause_connection_reinstatement(l_conn, 1);
4453 iscsit_dec_conn_usage_count(l_conn);
4454 }
4455
4456 /*
4457 * Return of 0 causes the TX thread to restart.
4458 */
4459 int iscsit_logout_post_handler(
4460 struct iscsi_cmd *cmd,
4461 struct iscsi_conn *conn)
4462 {
4463 int ret = 0;
4464
4465 switch (cmd->logout_reason) {
4466 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4467 switch (cmd->logout_response) {
4468 case ISCSI_LOGOUT_SUCCESS:
4469 case ISCSI_LOGOUT_CLEANUP_FAILED:
4470 default:
4471 iscsit_logout_post_handler_closesession(conn);
4472 break;
4473 }
4474 ret = 0;
4475 break;
4476 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4477 if (conn->cid == cmd->logout_cid) {
4478 switch (cmd->logout_response) {
4479 case ISCSI_LOGOUT_SUCCESS:
4480 case ISCSI_LOGOUT_CLEANUP_FAILED:
4481 default:
4482 iscsit_logout_post_handler_samecid(conn);
4483 break;
4484 }
4485 ret = 0;
4486 } else {
4487 switch (cmd->logout_response) {
4488 case ISCSI_LOGOUT_SUCCESS:
4489 iscsit_logout_post_handler_diffcid(conn,
4490 cmd->logout_cid);
4491 break;
4492 case ISCSI_LOGOUT_CID_NOT_FOUND:
4493 case ISCSI_LOGOUT_CLEANUP_FAILED:
4494 default:
4495 break;
4496 }
4497 ret = 1;
4498 }
4499 break;
4500 case ISCSI_LOGOUT_REASON_RECOVERY:
4501 switch (cmd->logout_response) {
4502 case ISCSI_LOGOUT_SUCCESS:
4503 case ISCSI_LOGOUT_CID_NOT_FOUND:
4504 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4505 case ISCSI_LOGOUT_CLEANUP_FAILED:
4506 default:
4507 break;
4508 }
4509 ret = 1;
4510 break;
4511 default:
4512 break;
4513
4514 }
4515 return ret;
4516 }
4517 EXPORT_SYMBOL(iscsit_logout_post_handler);
4518
4519 void iscsit_fail_session(struct iscsi_session *sess)
4520 {
4521 struct iscsi_conn *conn;
4522
4523 spin_lock_bh(&sess->conn_lock);
4524 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4525 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4526 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4527 }
4528 spin_unlock_bh(&sess->conn_lock);
4529
4530 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4531 sess->session_state = TARG_SESS_STATE_FAILED;
4532 }
4533
4534 int iscsit_free_session(struct iscsi_session *sess)
4535 {
4536 u16 conn_count = atomic_read(&sess->nconn);
4537 struct iscsi_conn *conn, *conn_tmp = NULL;
4538 int is_last;
4539
4540 spin_lock_bh(&sess->conn_lock);
4541 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4542
4543 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4544 conn_list) {
4545 if (conn_count == 0)
4546 break;
4547
4548 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4549 is_last = 1;
4550 } else {
4551 iscsit_inc_conn_usage_count(conn_tmp);
4552 is_last = 0;
4553 }
4554 iscsit_inc_conn_usage_count(conn);
4555
4556 spin_unlock_bh(&sess->conn_lock);
4557 iscsit_cause_connection_reinstatement(conn, 1);
4558 spin_lock_bh(&sess->conn_lock);
4559
4560 iscsit_dec_conn_usage_count(conn);
4561 if (is_last == 0)
4562 iscsit_dec_conn_usage_count(conn_tmp);
4563
4564 conn_count--;
4565 }
4566
4567 if (atomic_read(&sess->nconn)) {
4568 spin_unlock_bh(&sess->conn_lock);
4569 wait_for_completion(&sess->session_wait_comp);
4570 } else
4571 spin_unlock_bh(&sess->conn_lock);
4572
4573 iscsit_close_session(sess);
4574 return 0;
4575 }
4576
4577 void iscsit_stop_session(
4578 struct iscsi_session *sess,
4579 int session_sleep,
4580 int connection_sleep)
4581 {
4582 u16 conn_count = atomic_read(&sess->nconn);
4583 struct iscsi_conn *conn, *conn_tmp = NULL;
4584 int is_last;
4585
4586 spin_lock_bh(&sess->conn_lock);
4587 if (session_sleep)
4588 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4589
4590 if (connection_sleep) {
4591 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4592 conn_list) {
4593 if (conn_count == 0)
4594 break;
4595
4596 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4597 is_last = 1;
4598 } else {
4599 iscsit_inc_conn_usage_count(conn_tmp);
4600 is_last = 0;
4601 }
4602 iscsit_inc_conn_usage_count(conn);
4603
4604 spin_unlock_bh(&sess->conn_lock);
4605 iscsit_cause_connection_reinstatement(conn, 1);
4606 spin_lock_bh(&sess->conn_lock);
4607
4608 iscsit_dec_conn_usage_count(conn);
4609 if (is_last == 0)
4610 iscsit_dec_conn_usage_count(conn_tmp);
4611 conn_count--;
4612 }
4613 } else {
4614 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4615 iscsit_cause_connection_reinstatement(conn, 0);
4616 }
4617
4618 if (session_sleep && atomic_read(&sess->nconn)) {
4619 spin_unlock_bh(&sess->conn_lock);
4620 wait_for_completion(&sess->session_wait_comp);
4621 } else
4622 spin_unlock_bh(&sess->conn_lock);
4623 }
4624
4625 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4626 {
4627 struct iscsi_session *sess;
4628 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4629 struct se_session *se_sess, *se_sess_tmp;
4630 LIST_HEAD(free_list);
4631 int session_count = 0;
4632
4633 spin_lock_bh(&se_tpg->session_lock);
4634 if (tpg->nsessions && !force) {
4635 spin_unlock_bh(&se_tpg->session_lock);
4636 return -1;
4637 }
4638
4639 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4640 sess_list) {
4641 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4642
4643 spin_lock(&sess->conn_lock);
4644 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4645 atomic_read(&sess->session_logout) ||
4646 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4647 spin_unlock(&sess->conn_lock);
4648 continue;
4649 }
4650 atomic_set(&sess->session_reinstatement, 1);
4651 atomic_set(&sess->session_fall_back_to_erl0, 1);
4652 spin_unlock(&sess->conn_lock);
4653
4654 list_move_tail(&se_sess->sess_list, &free_list);
4655 }
4656 spin_unlock_bh(&se_tpg->session_lock);
4657
4658 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4659 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4660
4661 iscsit_free_session(sess);
4662 session_count++;
4663 }
4664
4665 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4666 " Group: %hu\n", session_count, tpg->tpgt);
4667 return 0;
4668 }
4669
4670 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4671 MODULE_VERSION("4.1.x");
4672 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4673 MODULE_LICENSE("GPL");
4674
4675 module_init(iscsi_target_init_module);
4676 module_exit(iscsi_target_cleanup_module);
Linux with added FPC-III support