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[mirror_ubuntu-bionic-kernel.git] / drivers / target / iscsi / iscsi_target.c
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 <net/ipv6.h>
30 #include <scsi/scsi_proto.h>
31 #include <scsi/iscsi_proto.h>
32 #include <scsi/scsi_tcq.h>
33 #include <target/target_core_base.h>
34 #include <target/target_core_fabric.h>
35
36 #include <target/iscsi/iscsi_target_core.h>
37 #include "iscsi_target_parameters.h"
38 #include "iscsi_target_seq_pdu_list.h"
39 #include "iscsi_target_datain_values.h"
40 #include "iscsi_target_erl0.h"
41 #include "iscsi_target_erl1.h"
42 #include "iscsi_target_erl2.h"
43 #include "iscsi_target_login.h"
44 #include "iscsi_target_tmr.h"
45 #include "iscsi_target_tpg.h"
46 #include "iscsi_target_util.h"
47 #include "iscsi_target.h"
48 #include "iscsi_target_device.h"
49 #include <target/iscsi/iscsi_target_stat.h>
50
51 #include <target/iscsi/iscsi_transport.h>
52
53 static LIST_HEAD(g_tiqn_list);
54 static LIST_HEAD(g_np_list);
55 static DEFINE_SPINLOCK(tiqn_lock);
56 static DEFINE_MUTEX(np_lock);
57
58 static struct idr tiqn_idr;
59 struct idr sess_idr;
60 struct mutex auth_id_lock;
61 spinlock_t sess_idr_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 /*
312 * Called with mutex np_lock held
313 */
314 static struct iscsi_np *iscsit_get_np(
315 struct sockaddr_storage *sockaddr,
316 int network_transport)
317 {
318 struct iscsi_np *np;
319 bool match;
320
321 list_for_each_entry(np, &g_np_list, np_list) {
322 spin_lock_bh(&np->np_thread_lock);
323 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
324 spin_unlock_bh(&np->np_thread_lock);
325 continue;
326 }
327
328 match = iscsit_check_np_match(sockaddr, np, network_transport);
329 if (match) {
330 /*
331 * Increment the np_exports reference count now to
332 * prevent iscsit_del_np() below from being called
333 * while iscsi_tpg_add_network_portal() is called.
334 */
335 np->np_exports++;
336 spin_unlock_bh(&np->np_thread_lock);
337 return np;
338 }
339 spin_unlock_bh(&np->np_thread_lock);
340 }
341
342 return NULL;
343 }
344
345 struct iscsi_np *iscsit_add_np(
346 struct sockaddr_storage *sockaddr,
347 int network_transport)
348 {
349 struct iscsi_np *np;
350 int ret;
351
352 mutex_lock(&np_lock);
353
354 /*
355 * Locate the existing struct iscsi_np if already active..
356 */
357 np = iscsit_get_np(sockaddr, network_transport);
358 if (np) {
359 mutex_unlock(&np_lock);
360 return np;
361 }
362
363 np = kzalloc(sizeof(*np), GFP_KERNEL);
364 if (!np) {
365 mutex_unlock(&np_lock);
366 return ERR_PTR(-ENOMEM);
367 }
368
369 np->np_flags |= NPF_IP_NETWORK;
370 np->np_network_transport = network_transport;
371 spin_lock_init(&np->np_thread_lock);
372 init_completion(&np->np_restart_comp);
373 INIT_LIST_HEAD(&np->np_list);
374
375 timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
376
377 ret = iscsi_target_setup_login_socket(np, sockaddr);
378 if (ret != 0) {
379 kfree(np);
380 mutex_unlock(&np_lock);
381 return ERR_PTR(ret);
382 }
383
384 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
385 if (IS_ERR(np->np_thread)) {
386 pr_err("Unable to create kthread: iscsi_np\n");
387 ret = PTR_ERR(np->np_thread);
388 kfree(np);
389 mutex_unlock(&np_lock);
390 return ERR_PTR(ret);
391 }
392 /*
393 * Increment the np_exports reference count now to prevent
394 * iscsit_del_np() below from being run while a new call to
395 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
396 * active. We don't need to hold np->np_thread_lock at this
397 * point because iscsi_np has not been added to g_np_list yet.
398 */
399 np->np_exports = 1;
400 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
401
402 list_add_tail(&np->np_list, &g_np_list);
403 mutex_unlock(&np_lock);
404
405 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
406 &np->np_sockaddr, np->np_transport->name);
407
408 return np;
409 }
410
411 int iscsit_reset_np_thread(
412 struct iscsi_np *np,
413 struct iscsi_tpg_np *tpg_np,
414 struct iscsi_portal_group *tpg,
415 bool shutdown)
416 {
417 spin_lock_bh(&np->np_thread_lock);
418 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
419 spin_unlock_bh(&np->np_thread_lock);
420 return 0;
421 }
422 np->np_thread_state = ISCSI_NP_THREAD_RESET;
423 atomic_inc(&np->np_reset_count);
424
425 if (np->np_thread) {
426 spin_unlock_bh(&np->np_thread_lock);
427 send_sig(SIGINT, np->np_thread, 1);
428 wait_for_completion(&np->np_restart_comp);
429 spin_lock_bh(&np->np_thread_lock);
430 }
431 spin_unlock_bh(&np->np_thread_lock);
432
433 if (tpg_np && shutdown) {
434 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
435
436 wait_for_completion(&tpg_np->tpg_np_comp);
437 }
438
439 return 0;
440 }
441
442 static void iscsit_free_np(struct iscsi_np *np)
443 {
444 if (np->np_socket)
445 sock_release(np->np_socket);
446 }
447
448 int iscsit_del_np(struct iscsi_np *np)
449 {
450 spin_lock_bh(&np->np_thread_lock);
451 np->np_exports--;
452 if (np->np_exports) {
453 np->enabled = true;
454 spin_unlock_bh(&np->np_thread_lock);
455 return 0;
456 }
457 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
458 spin_unlock_bh(&np->np_thread_lock);
459
460 if (np->np_thread) {
461 /*
462 * We need to send the signal to wakeup Linux/Net
463 * which may be sleeping in sock_accept()..
464 */
465 send_sig(SIGINT, np->np_thread, 1);
466 kthread_stop(np->np_thread);
467 np->np_thread = NULL;
468 }
469
470 np->np_transport->iscsit_free_np(np);
471
472 mutex_lock(&np_lock);
473 list_del(&np->np_list);
474 mutex_unlock(&np_lock);
475
476 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
477 &np->np_sockaddr, np->np_transport->name);
478
479 iscsit_put_transport(np->np_transport);
480 kfree(np);
481 return 0;
482 }
483
484 static void iscsit_get_rx_pdu(struct iscsi_conn *);
485
486 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
487 {
488 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
489 }
490 EXPORT_SYMBOL(iscsit_queue_rsp);
491
492 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
493 {
494 spin_lock_bh(&conn->cmd_lock);
495 if (!list_empty(&cmd->i_conn_node) &&
496 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
497 list_del_init(&cmd->i_conn_node);
498 spin_unlock_bh(&conn->cmd_lock);
499
500 __iscsit_free_cmd(cmd, true);
501 }
502 EXPORT_SYMBOL(iscsit_aborted_task);
503
504 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
505 u32, u32, const void *, void *);
506 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
507
508 static int
509 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
510 const void *data_buf, u32 data_buf_len)
511 {
512 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
513 struct kvec *iov;
514 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
515 int ret;
516
517 iov = &cmd->iov_misc[0];
518 iov[niov].iov_base = cmd->pdu;
519 iov[niov++].iov_len = ISCSI_HDR_LEN;
520
521 if (conn->conn_ops->HeaderDigest) {
522 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
523
524 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
525 ISCSI_HDR_LEN, 0, NULL,
526 header_digest);
527
528 iov[0].iov_len += ISCSI_CRC_LEN;
529 tx_size += ISCSI_CRC_LEN;
530 pr_debug("Attaching CRC32C HeaderDigest"
531 " to opcode 0x%x 0x%08x\n",
532 hdr->opcode, *header_digest);
533 }
534
535 if (data_buf_len) {
536 u32 padding = ((-data_buf_len) & 3);
537
538 iov[niov].iov_base = (void *)data_buf;
539 iov[niov++].iov_len = data_buf_len;
540 tx_size += data_buf_len;
541
542 if (padding != 0) {
543 iov[niov].iov_base = &cmd->pad_bytes;
544 iov[niov++].iov_len = padding;
545 tx_size += padding;
546 pr_debug("Attaching %u additional"
547 " padding bytes.\n", padding);
548 }
549
550 if (conn->conn_ops->DataDigest) {
551 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
552 data_buf, data_buf_len,
553 padding, &cmd->pad_bytes,
554 &cmd->data_crc);
555
556 iov[niov].iov_base = &cmd->data_crc;
557 iov[niov++].iov_len = ISCSI_CRC_LEN;
558 tx_size += ISCSI_CRC_LEN;
559 pr_debug("Attached DataDigest for %u"
560 " bytes opcode 0x%x, CRC 0x%08x\n",
561 data_buf_len, hdr->opcode, cmd->data_crc);
562 }
563 }
564
565 cmd->iov_misc_count = niov;
566 cmd->tx_size = tx_size;
567
568 ret = iscsit_send_tx_data(cmd, conn, 1);
569 if (ret < 0) {
570 iscsit_tx_thread_wait_for_tcp(conn);
571 return ret;
572 }
573
574 return 0;
575 }
576
577 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
578 static void iscsit_unmap_iovec(struct iscsi_cmd *);
579 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
580 u32, u32, u32, u8 *);
581 static int
582 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
583 const struct iscsi_datain *datain)
584 {
585 struct kvec *iov;
586 u32 iov_count = 0, tx_size = 0;
587 int ret, iov_ret;
588
589 iov = &cmd->iov_data[0];
590 iov[iov_count].iov_base = cmd->pdu;
591 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
592 tx_size += ISCSI_HDR_LEN;
593
594 if (conn->conn_ops->HeaderDigest) {
595 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
596
597 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
598 ISCSI_HDR_LEN, 0, NULL,
599 header_digest);
600
601 iov[0].iov_len += ISCSI_CRC_LEN;
602 tx_size += ISCSI_CRC_LEN;
603
604 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
605 *header_digest);
606 }
607
608 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
609 datain->offset, datain->length);
610 if (iov_ret < 0)
611 return -1;
612
613 iov_count += iov_ret;
614 tx_size += datain->length;
615
616 cmd->padding = ((-datain->length) & 3);
617 if (cmd->padding) {
618 iov[iov_count].iov_base = cmd->pad_bytes;
619 iov[iov_count++].iov_len = cmd->padding;
620 tx_size += cmd->padding;
621
622 pr_debug("Attaching %u padding bytes\n", cmd->padding);
623 }
624
625 if (conn->conn_ops->DataDigest) {
626 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
627 cmd, datain->offset,
628 datain->length,
629 cmd->padding,
630 cmd->pad_bytes);
631
632 iov[iov_count].iov_base = &cmd->data_crc;
633 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
634 tx_size += ISCSI_CRC_LEN;
635
636 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
637 datain->length + cmd->padding, cmd->data_crc);
638 }
639
640 cmd->iov_data_count = iov_count;
641 cmd->tx_size = tx_size;
642
643 ret = iscsit_fe_sendpage_sg(cmd, conn);
644
645 iscsit_unmap_iovec(cmd);
646
647 if (ret < 0) {
648 iscsit_tx_thread_wait_for_tcp(conn);
649 return ret;
650 }
651
652 return 0;
653 }
654
655 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
656 struct iscsi_datain_req *dr, const void *buf,
657 u32 buf_len)
658 {
659 if (dr)
660 return iscsit_xmit_datain_pdu(conn, cmd, buf);
661 else
662 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
663 }
664
665 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
666 {
667 return TARGET_PROT_NORMAL;
668 }
669
670 static struct iscsit_transport iscsi_target_transport = {
671 .name = "iSCSI/TCP",
672 .transport_type = ISCSI_TCP,
673 .rdma_shutdown = false,
674 .owner = NULL,
675 .iscsit_setup_np = iscsit_setup_np,
676 .iscsit_accept_np = iscsit_accept_np,
677 .iscsit_free_np = iscsit_free_np,
678 .iscsit_get_login_rx = iscsit_get_login_rx,
679 .iscsit_put_login_tx = iscsit_put_login_tx,
680 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
681 .iscsit_immediate_queue = iscsit_immediate_queue,
682 .iscsit_response_queue = iscsit_response_queue,
683 .iscsit_queue_data_in = iscsit_queue_rsp,
684 .iscsit_queue_status = iscsit_queue_rsp,
685 .iscsit_aborted_task = iscsit_aborted_task,
686 .iscsit_xmit_pdu = iscsit_xmit_pdu,
687 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
688 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
689 };
690
691 static int __init iscsi_target_init_module(void)
692 {
693 int ret = 0, size;
694
695 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
696 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
697 if (!iscsit_global)
698 return -1;
699
700 spin_lock_init(&iscsit_global->ts_bitmap_lock);
701 mutex_init(&auth_id_lock);
702 spin_lock_init(&sess_idr_lock);
703 idr_init(&tiqn_idr);
704 idr_init(&sess_idr);
705
706 ret = target_register_template(&iscsi_ops);
707 if (ret)
708 goto out;
709
710 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
711 iscsit_global->ts_bitmap = vzalloc(size);
712 if (!iscsit_global->ts_bitmap)
713 goto configfs_out;
714
715 lio_qr_cache = kmem_cache_create("lio_qr_cache",
716 sizeof(struct iscsi_queue_req),
717 __alignof__(struct iscsi_queue_req), 0, NULL);
718 if (!lio_qr_cache) {
719 pr_err("nable to kmem_cache_create() for"
720 " lio_qr_cache\n");
721 goto bitmap_out;
722 }
723
724 lio_dr_cache = kmem_cache_create("lio_dr_cache",
725 sizeof(struct iscsi_datain_req),
726 __alignof__(struct iscsi_datain_req), 0, NULL);
727 if (!lio_dr_cache) {
728 pr_err("Unable to kmem_cache_create() for"
729 " lio_dr_cache\n");
730 goto qr_out;
731 }
732
733 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
734 sizeof(struct iscsi_ooo_cmdsn),
735 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
736 if (!lio_ooo_cache) {
737 pr_err("Unable to kmem_cache_create() for"
738 " lio_ooo_cache\n");
739 goto dr_out;
740 }
741
742 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
743 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
744 0, NULL);
745 if (!lio_r2t_cache) {
746 pr_err("Unable to kmem_cache_create() for"
747 " lio_r2t_cache\n");
748 goto ooo_out;
749 }
750
751 iscsit_register_transport(&iscsi_target_transport);
752
753 if (iscsit_load_discovery_tpg() < 0)
754 goto r2t_out;
755
756 return ret;
757 r2t_out:
758 iscsit_unregister_transport(&iscsi_target_transport);
759 kmem_cache_destroy(lio_r2t_cache);
760 ooo_out:
761 kmem_cache_destroy(lio_ooo_cache);
762 dr_out:
763 kmem_cache_destroy(lio_dr_cache);
764 qr_out:
765 kmem_cache_destroy(lio_qr_cache);
766 bitmap_out:
767 vfree(iscsit_global->ts_bitmap);
768 configfs_out:
769 /* XXX: this probably wants it to be it's own unwind step.. */
770 if (iscsit_global->discovery_tpg)
771 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
772 target_unregister_template(&iscsi_ops);
773 out:
774 kfree(iscsit_global);
775 return -ENOMEM;
776 }
777
778 static void __exit iscsi_target_cleanup_module(void)
779 {
780 iscsit_release_discovery_tpg();
781 iscsit_unregister_transport(&iscsi_target_transport);
782 kmem_cache_destroy(lio_qr_cache);
783 kmem_cache_destroy(lio_dr_cache);
784 kmem_cache_destroy(lio_ooo_cache);
785 kmem_cache_destroy(lio_r2t_cache);
786
787 /*
788 * Shutdown discovery sessions and disable discovery TPG
789 */
790 if (iscsit_global->discovery_tpg)
791 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
792
793 target_unregister_template(&iscsi_ops);
794
795 vfree(iscsit_global->ts_bitmap);
796 kfree(iscsit_global);
797 }
798
799 int iscsit_add_reject(
800 struct iscsi_conn *conn,
801 u8 reason,
802 unsigned char *buf)
803 {
804 struct iscsi_cmd *cmd;
805
806 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
807 if (!cmd)
808 return -1;
809
810 cmd->iscsi_opcode = ISCSI_OP_REJECT;
811 cmd->reject_reason = reason;
812
813 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
814 if (!cmd->buf_ptr) {
815 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
816 iscsit_free_cmd(cmd, false);
817 return -1;
818 }
819
820 spin_lock_bh(&conn->cmd_lock);
821 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
822 spin_unlock_bh(&conn->cmd_lock);
823
824 cmd->i_state = ISTATE_SEND_REJECT;
825 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
826
827 return -1;
828 }
829 EXPORT_SYMBOL(iscsit_add_reject);
830
831 static int iscsit_add_reject_from_cmd(
832 struct iscsi_cmd *cmd,
833 u8 reason,
834 bool add_to_conn,
835 unsigned char *buf)
836 {
837 struct iscsi_conn *conn;
838 const bool do_put = cmd->se_cmd.se_tfo != NULL;
839
840 if (!cmd->conn) {
841 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
842 cmd->init_task_tag);
843 return -1;
844 }
845 conn = cmd->conn;
846
847 cmd->iscsi_opcode = ISCSI_OP_REJECT;
848 cmd->reject_reason = reason;
849
850 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
851 if (!cmd->buf_ptr) {
852 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
853 iscsit_free_cmd(cmd, false);
854 return -1;
855 }
856
857 if (add_to_conn) {
858 spin_lock_bh(&conn->cmd_lock);
859 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
860 spin_unlock_bh(&conn->cmd_lock);
861 }
862
863 cmd->i_state = ISTATE_SEND_REJECT;
864 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
865 /*
866 * Perform the kref_put now if se_cmd has already been setup by
867 * scsit_setup_scsi_cmd()
868 */
869 if (do_put) {
870 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
871 target_put_sess_cmd(&cmd->se_cmd);
872 }
873 return -1;
874 }
875
876 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
877 unsigned char *buf)
878 {
879 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
880 }
881
882 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
883 {
884 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
885 }
886 EXPORT_SYMBOL(iscsit_reject_cmd);
887
888 /*
889 * Map some portion of the allocated scatterlist to an iovec, suitable for
890 * kernel sockets to copy data in/out.
891 */
892 static int iscsit_map_iovec(
893 struct iscsi_cmd *cmd,
894 struct kvec *iov,
895 u32 data_offset,
896 u32 data_length)
897 {
898 u32 i = 0;
899 struct scatterlist *sg;
900 unsigned int page_off;
901
902 /*
903 * We know each entry in t_data_sg contains a page.
904 */
905 u32 ent = data_offset / PAGE_SIZE;
906
907 if (ent >= cmd->se_cmd.t_data_nents) {
908 pr_err("Initial page entry out-of-bounds\n");
909 return -1;
910 }
911
912 sg = &cmd->se_cmd.t_data_sg[ent];
913 page_off = (data_offset % PAGE_SIZE);
914
915 cmd->first_data_sg = sg;
916 cmd->first_data_sg_off = page_off;
917
918 while (data_length) {
919 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
920
921 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
922 iov[i].iov_len = cur_len;
923
924 data_length -= cur_len;
925 page_off = 0;
926 sg = sg_next(sg);
927 i++;
928 }
929
930 cmd->kmapped_nents = i;
931
932 return i;
933 }
934
935 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
936 {
937 u32 i;
938 struct scatterlist *sg;
939
940 sg = cmd->first_data_sg;
941
942 for (i = 0; i < cmd->kmapped_nents; i++)
943 kunmap(sg_page(&sg[i]));
944 }
945
946 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
947 {
948 LIST_HEAD(ack_list);
949 struct iscsi_cmd *cmd, *cmd_p;
950
951 conn->exp_statsn = exp_statsn;
952
953 if (conn->sess->sess_ops->RDMAExtensions)
954 return;
955
956 spin_lock_bh(&conn->cmd_lock);
957 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
958 spin_lock(&cmd->istate_lock);
959 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
960 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
961 cmd->i_state = ISTATE_REMOVE;
962 spin_unlock(&cmd->istate_lock);
963 list_move_tail(&cmd->i_conn_node, &ack_list);
964 continue;
965 }
966 spin_unlock(&cmd->istate_lock);
967 }
968 spin_unlock_bh(&conn->cmd_lock);
969
970 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
971 list_del_init(&cmd->i_conn_node);
972 iscsit_free_cmd(cmd, false);
973 }
974 }
975
976 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
977 {
978 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
979
980 iov_count += ISCSI_IOV_DATA_BUFFER;
981 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
982 if (!cmd->iov_data)
983 return -ENOMEM;
984
985 cmd->orig_iov_data_count = iov_count;
986 return 0;
987 }
988
989 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
990 unsigned char *buf)
991 {
992 int data_direction, payload_length;
993 struct iscsi_scsi_req *hdr;
994 int iscsi_task_attr;
995 int sam_task_attr;
996
997 atomic_long_inc(&conn->sess->cmd_pdus);
998
999 hdr = (struct iscsi_scsi_req *) buf;
1000 payload_length = ntoh24(hdr->dlength);
1001
1002 /* FIXME; Add checks for AdditionalHeaderSegment */
1003
1004 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1005 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1006 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1007 " not set. Bad iSCSI Initiator.\n");
1008 return iscsit_add_reject_cmd(cmd,
1009 ISCSI_REASON_BOOKMARK_INVALID, buf);
1010 }
1011
1012 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1013 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1014 /*
1015 * From RFC-3720 Section 10.3.1:
1016 *
1017 * "Either or both of R and W MAY be 1 when either the
1018 * Expected Data Transfer Length and/or Bidirectional Read
1019 * Expected Data Transfer Length are 0"
1020 *
1021 * For this case, go ahead and clear the unnecssary bits
1022 * to avoid any confusion with ->data_direction.
1023 */
1024 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1025 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1026
1027 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1028 " set when Expected Data Transfer Length is 0 for"
1029 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1030 }
1031
1032 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1033 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1034 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1035 " MUST be set if Expected Data Transfer Length is not 0."
1036 " Bad iSCSI Initiator\n");
1037 return iscsit_add_reject_cmd(cmd,
1038 ISCSI_REASON_BOOKMARK_INVALID, buf);
1039 }
1040
1041 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1042 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1043 pr_err("Bidirectional operations not supported!\n");
1044 return iscsit_add_reject_cmd(cmd,
1045 ISCSI_REASON_BOOKMARK_INVALID, buf);
1046 }
1047
1048 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1049 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1050 " Scsi Command PDU.\n");
1051 return iscsit_add_reject_cmd(cmd,
1052 ISCSI_REASON_BOOKMARK_INVALID, buf);
1053 }
1054
1055 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1056 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1057 " protocol error.\n", payload_length);
1058 return iscsit_add_reject_cmd(cmd,
1059 ISCSI_REASON_PROTOCOL_ERROR, buf);
1060 }
1061
1062 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1063 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1064 pr_err("Expected Data Transfer Length and Length of"
1065 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1066 " bit is not set protocol error\n");
1067 return iscsit_add_reject_cmd(cmd,
1068 ISCSI_REASON_PROTOCOL_ERROR, buf);
1069 }
1070
1071 if (payload_length > be32_to_cpu(hdr->data_length)) {
1072 pr_err("DataSegmentLength: %u is greater than"
1073 " EDTL: %u, protocol error.\n", payload_length,
1074 hdr->data_length);
1075 return iscsit_add_reject_cmd(cmd,
1076 ISCSI_REASON_PROTOCOL_ERROR, buf);
1077 }
1078
1079 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1080 pr_err("DataSegmentLength: %u is greater than"
1081 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1082 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1083 return iscsit_add_reject_cmd(cmd,
1084 ISCSI_REASON_PROTOCOL_ERROR, buf);
1085 }
1086
1087 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1088 pr_err("DataSegmentLength: %u is greater than"
1089 " FirstBurstLength: %u, protocol error.\n",
1090 payload_length, conn->sess->sess_ops->FirstBurstLength);
1091 return iscsit_add_reject_cmd(cmd,
1092 ISCSI_REASON_BOOKMARK_INVALID, buf);
1093 }
1094
1095 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1096 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1097 DMA_NONE;
1098
1099 cmd->data_direction = data_direction;
1100 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1101 /*
1102 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1103 */
1104 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1105 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1106 sam_task_attr = TCM_SIMPLE_TAG;
1107 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1108 sam_task_attr = TCM_ORDERED_TAG;
1109 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1110 sam_task_attr = TCM_HEAD_TAG;
1111 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1112 sam_task_attr = TCM_ACA_TAG;
1113 else {
1114 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1115 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1116 sam_task_attr = TCM_SIMPLE_TAG;
1117 }
1118
1119 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1120 cmd->i_state = ISTATE_NEW_CMD;
1121 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1122 cmd->immediate_data = (payload_length) ? 1 : 0;
1123 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1124 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1125 if (cmd->unsolicited_data)
1126 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1127
1128 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1129 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1130 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1131 else
1132 cmd->targ_xfer_tag = 0xFFFFFFFF;
1133 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1134 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1135 cmd->first_burst_len = payload_length;
1136
1137 if (!conn->sess->sess_ops->RDMAExtensions &&
1138 cmd->data_direction == DMA_FROM_DEVICE) {
1139 struct iscsi_datain_req *dr;
1140
1141 dr = iscsit_allocate_datain_req();
1142 if (!dr)
1143 return iscsit_add_reject_cmd(cmd,
1144 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1145
1146 iscsit_attach_datain_req(cmd, dr);
1147 }
1148
1149 /*
1150 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1151 */
1152 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1153 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1154 cmd->data_direction, sam_task_attr,
1155 cmd->sense_buffer + 2);
1156
1157 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1158 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1159 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1160 conn->cid);
1161
1162 target_get_sess_cmd(&cmd->se_cmd, true);
1163
1164 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1165 scsilun_to_int(&hdr->lun));
1166 if (cmd->sense_reason)
1167 goto attach_cmd;
1168
1169 /* only used for printks or comparing with ->ref_task_tag */
1170 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1171 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1172 if (cmd->sense_reason) {
1173 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1174 return iscsit_add_reject_cmd(cmd,
1175 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1176 }
1177
1178 goto attach_cmd;
1179 }
1180
1181 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1182 return iscsit_add_reject_cmd(cmd,
1183 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1184 }
1185
1186 attach_cmd:
1187 spin_lock_bh(&conn->cmd_lock);
1188 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1189 spin_unlock_bh(&conn->cmd_lock);
1190 /*
1191 * Check if we need to delay processing because of ALUA
1192 * Active/NonOptimized primary access state..
1193 */
1194 core_alua_check_nonop_delay(&cmd->se_cmd);
1195
1196 return 0;
1197 }
1198 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1199
1200 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1201 {
1202 iscsit_set_dataout_sequence_values(cmd);
1203
1204 spin_lock_bh(&cmd->dataout_timeout_lock);
1205 iscsit_start_dataout_timer(cmd, cmd->conn);
1206 spin_unlock_bh(&cmd->dataout_timeout_lock);
1207 }
1208 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1209
1210 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1211 struct iscsi_scsi_req *hdr)
1212 {
1213 int cmdsn_ret = 0;
1214 /*
1215 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1216 * the Immediate Bit is not set, and no Immediate
1217 * Data is attached.
1218 *
1219 * A PDU/CmdSN carrying Immediate Data can only
1220 * be processed after the DataCRC has passed.
1221 * If the DataCRC fails, the CmdSN MUST NOT
1222 * be acknowledged. (See below)
1223 */
1224 if (!cmd->immediate_data) {
1225 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1226 (unsigned char *)hdr, hdr->cmdsn);
1227 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1228 return -1;
1229 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1230 target_put_sess_cmd(&cmd->se_cmd);
1231 return 0;
1232 }
1233 }
1234
1235 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1236
1237 /*
1238 * If no Immediate Data is attached, it's OK to return now.
1239 */
1240 if (!cmd->immediate_data) {
1241 if (!cmd->sense_reason && cmd->unsolicited_data)
1242 iscsit_set_unsoliticed_dataout(cmd);
1243 if (!cmd->sense_reason)
1244 return 0;
1245
1246 target_put_sess_cmd(&cmd->se_cmd);
1247 return 0;
1248 }
1249
1250 /*
1251 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1252 * execution. These exceptions are processed in CmdSN order using
1253 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1254 */
1255 if (cmd->sense_reason)
1256 return 1;
1257 /*
1258 * Call directly into transport_generic_new_cmd() to perform
1259 * the backend memory allocation.
1260 */
1261 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1262 if (cmd->sense_reason)
1263 return 1;
1264
1265 return 0;
1266 }
1267 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1268
1269 static int
1270 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1271 bool dump_payload)
1272 {
1273 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1274 /*
1275 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1276 */
1277 if (dump_payload)
1278 goto after_immediate_data;
1279 /*
1280 * Check for underflow case where both EDTL and immediate data payload
1281 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1282 * already been set in target_cmd_size_check() as se_cmd->data_length.
1283 *
1284 * For this special case, fail the command and dump the immediate data
1285 * payload.
1286 */
1287 if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1288 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1289 goto after_immediate_data;
1290 }
1291
1292 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1293 cmd->first_burst_len);
1294 after_immediate_data:
1295 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1296 /*
1297 * A PDU/CmdSN carrying Immediate Data passed
1298 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1299 * Immediate Bit is not set.
1300 */
1301 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1302 (unsigned char *)hdr, hdr->cmdsn);
1303 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1304 return -1;
1305
1306 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1307 int rc;
1308
1309 rc = iscsit_dump_data_payload(cmd->conn,
1310 cmd->first_burst_len, 1);
1311 target_put_sess_cmd(&cmd->se_cmd);
1312 return rc;
1313 } else if (cmd->unsolicited_data)
1314 iscsit_set_unsoliticed_dataout(cmd);
1315
1316 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1317 /*
1318 * Immediate Data failed DataCRC and ERL>=1,
1319 * silently drop this PDU and let the initiator
1320 * plug the CmdSN gap.
1321 *
1322 * FIXME: Send Unsolicited NOPIN with reserved
1323 * TTT here to help the initiator figure out
1324 * the missing CmdSN, although they should be
1325 * intelligent enough to determine the missing
1326 * CmdSN and issue a retry to plug the sequence.
1327 */
1328 cmd->i_state = ISTATE_REMOVE;
1329 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1330 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1331 return -1;
1332
1333 return 0;
1334 }
1335
1336 static int
1337 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1338 unsigned char *buf)
1339 {
1340 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1341 int rc, immed_data;
1342 bool dump_payload = false;
1343
1344 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1345 if (rc < 0)
1346 return 0;
1347 /*
1348 * Allocation iovecs needed for struct socket operations for
1349 * traditional iSCSI block I/O.
1350 */
1351 if (iscsit_allocate_iovecs(cmd) < 0) {
1352 return iscsit_reject_cmd(cmd,
1353 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1354 }
1355 immed_data = cmd->immediate_data;
1356
1357 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1358 if (rc < 0)
1359 return rc;
1360 else if (rc > 0)
1361 dump_payload = true;
1362
1363 if (!immed_data)
1364 return 0;
1365
1366 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1367 }
1368
1369 static u32 iscsit_do_crypto_hash_sg(
1370 struct ahash_request *hash,
1371 struct iscsi_cmd *cmd,
1372 u32 data_offset,
1373 u32 data_length,
1374 u32 padding,
1375 u8 *pad_bytes)
1376 {
1377 u32 data_crc;
1378 struct scatterlist *sg;
1379 unsigned int page_off;
1380
1381 crypto_ahash_init(hash);
1382
1383 sg = cmd->first_data_sg;
1384 page_off = cmd->first_data_sg_off;
1385
1386 while (data_length) {
1387 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1388
1389 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1390 crypto_ahash_update(hash);
1391
1392 data_length -= cur_len;
1393 page_off = 0;
1394 /* iscsit_map_iovec has already checked for invalid sg pointers */
1395 sg = sg_next(sg);
1396 }
1397
1398 if (padding) {
1399 struct scatterlist pad_sg;
1400
1401 sg_init_one(&pad_sg, pad_bytes, padding);
1402 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1403 padding);
1404 crypto_ahash_finup(hash);
1405 } else {
1406 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1407 crypto_ahash_final(hash);
1408 }
1409
1410 return data_crc;
1411 }
1412
1413 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1414 const void *buf, u32 payload_length, u32 padding,
1415 const void *pad_bytes, void *data_crc)
1416 {
1417 struct scatterlist sg[2];
1418
1419 sg_init_table(sg, ARRAY_SIZE(sg));
1420 sg_set_buf(sg, buf, payload_length);
1421 if (padding)
1422 sg_set_buf(sg + 1, pad_bytes, padding);
1423
1424 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1425
1426 crypto_ahash_digest(hash);
1427 }
1428
1429 int
1430 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1431 struct iscsi_cmd *cmd, u32 payload_length,
1432 bool *success)
1433 {
1434 struct iscsi_data *hdr = buf;
1435 struct se_cmd *se_cmd;
1436 int rc;
1437
1438 /* iSCSI write */
1439 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1440
1441 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1442 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1443 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1444 payload_length, conn->cid);
1445
1446 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1447 pr_err("Command ITT: 0x%08x received DataOUT after"
1448 " last DataOUT received, dumping payload\n",
1449 cmd->init_task_tag);
1450 return iscsit_dump_data_payload(conn, payload_length, 1);
1451 }
1452
1453 if (cmd->data_direction != DMA_TO_DEVICE) {
1454 pr_err("Command ITT: 0x%08x received DataOUT for a"
1455 " NON-WRITE command.\n", cmd->init_task_tag);
1456 return iscsit_dump_data_payload(conn, payload_length, 1);
1457 }
1458 se_cmd = &cmd->se_cmd;
1459 iscsit_mod_dataout_timer(cmd);
1460
1461 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1462 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1463 be32_to_cpu(hdr->offset), payload_length,
1464 cmd->se_cmd.data_length);
1465 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1466 }
1467
1468 if (cmd->unsolicited_data) {
1469 int dump_unsolicited_data = 0;
1470
1471 if (conn->sess->sess_ops->InitialR2T) {
1472 pr_err("Received unexpected unsolicited data"
1473 " while InitialR2T=Yes, protocol error.\n");
1474 transport_send_check_condition_and_sense(&cmd->se_cmd,
1475 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1476 return -1;
1477 }
1478 /*
1479 * Special case for dealing with Unsolicited DataOUT
1480 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1481 * failures;
1482 */
1483
1484 /* Something's amiss if we're not in WRITE_PENDING state... */
1485 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1486 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1487 dump_unsolicited_data = 1;
1488
1489 if (dump_unsolicited_data) {
1490 /*
1491 * Check if a delayed TASK_ABORTED status needs to
1492 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1493 * received with the unsolicited data out.
1494 */
1495 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1496 iscsit_stop_dataout_timer(cmd);
1497
1498 transport_check_aborted_status(se_cmd,
1499 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1500 return iscsit_dump_data_payload(conn, payload_length, 1);
1501 }
1502 } else {
1503 /*
1504 * For the normal solicited data path:
1505 *
1506 * Check for a delayed TASK_ABORTED status and dump any
1507 * incoming data out payload if one exists. Also, when the
1508 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1509 * data out sequence, we decrement outstanding_r2ts. Once
1510 * outstanding_r2ts reaches zero, go ahead and send the delayed
1511 * TASK_ABORTED status.
1512 */
1513 if (se_cmd->transport_state & CMD_T_ABORTED) {
1514 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1515 if (--cmd->outstanding_r2ts < 1) {
1516 iscsit_stop_dataout_timer(cmd);
1517 transport_check_aborted_status(
1518 se_cmd, 1);
1519 }
1520
1521 return iscsit_dump_data_payload(conn, payload_length, 1);
1522 }
1523 }
1524 /*
1525 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1526 * within-command recovery checks before receiving the payload.
1527 */
1528 rc = iscsit_check_pre_dataout(cmd, buf);
1529 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1530 return 0;
1531 else if (rc == DATAOUT_CANNOT_RECOVER)
1532 return -1;
1533 *success = true;
1534 return 0;
1535 }
1536 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1537
1538 int
1539 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1540 struct iscsi_cmd **out_cmd)
1541 {
1542 struct iscsi_data *hdr = buf;
1543 struct iscsi_cmd *cmd;
1544 u32 payload_length = ntoh24(hdr->dlength);
1545 int rc;
1546 bool success = false;
1547
1548 if (!payload_length) {
1549 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1550 return 0;
1551 }
1552
1553 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1554 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1555 " MaxXmitDataSegmentLength: %u\n", payload_length,
1556 conn->conn_ops->MaxXmitDataSegmentLength);
1557 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1558 }
1559
1560 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1561 if (!cmd)
1562 return 0;
1563
1564 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1565
1566 if (success)
1567 *out_cmd = cmd;
1568
1569 return rc;
1570 }
1571 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1572
1573 static int
1574 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1575 struct iscsi_data *hdr)
1576 {
1577 struct kvec *iov;
1578 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1579 u32 payload_length = ntoh24(hdr->dlength);
1580 int iov_ret, data_crc_failed = 0;
1581
1582 rx_size += payload_length;
1583 iov = &cmd->iov_data[0];
1584
1585 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1586 payload_length);
1587 if (iov_ret < 0)
1588 return -1;
1589
1590 iov_count += iov_ret;
1591
1592 padding = ((-payload_length) & 3);
1593 if (padding != 0) {
1594 iov[iov_count].iov_base = cmd->pad_bytes;
1595 iov[iov_count++].iov_len = padding;
1596 rx_size += padding;
1597 pr_debug("Receiving %u padding bytes.\n", padding);
1598 }
1599
1600 if (conn->conn_ops->DataDigest) {
1601 iov[iov_count].iov_base = &checksum;
1602 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1603 rx_size += ISCSI_CRC_LEN;
1604 }
1605
1606 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1607
1608 iscsit_unmap_iovec(cmd);
1609
1610 if (rx_got != rx_size)
1611 return -1;
1612
1613 if (conn->conn_ops->DataDigest) {
1614 u32 data_crc;
1615
1616 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1617 be32_to_cpu(hdr->offset),
1618 payload_length, padding,
1619 cmd->pad_bytes);
1620
1621 if (checksum != data_crc) {
1622 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1623 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1624 " does not match computed 0x%08x\n",
1625 hdr->itt, hdr->offset, payload_length,
1626 hdr->datasn, checksum, data_crc);
1627 data_crc_failed = 1;
1628 } else {
1629 pr_debug("Got CRC32C DataDigest 0x%08x for"
1630 " %u bytes of Data Out\n", checksum,
1631 payload_length);
1632 }
1633 }
1634
1635 return data_crc_failed;
1636 }
1637
1638 int
1639 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1640 bool data_crc_failed)
1641 {
1642 struct iscsi_conn *conn = cmd->conn;
1643 int rc, ooo_cmdsn;
1644 /*
1645 * Increment post receive data and CRC values or perform
1646 * within-command recovery.
1647 */
1648 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1649 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1650 return 0;
1651 else if (rc == DATAOUT_SEND_R2T) {
1652 iscsit_set_dataout_sequence_values(cmd);
1653 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1654 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1655 /*
1656 * Handle extra special case for out of order
1657 * Unsolicited Data Out.
1658 */
1659 spin_lock_bh(&cmd->istate_lock);
1660 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1661 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1662 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1663 spin_unlock_bh(&cmd->istate_lock);
1664
1665 iscsit_stop_dataout_timer(cmd);
1666 if (ooo_cmdsn)
1667 return 0;
1668 target_execute_cmd(&cmd->se_cmd);
1669 return 0;
1670 } else /* DATAOUT_CANNOT_RECOVER */
1671 return -1;
1672
1673 return 0;
1674 }
1675 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1676
1677 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1678 {
1679 struct iscsi_cmd *cmd = NULL;
1680 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1681 int rc;
1682 bool data_crc_failed = false;
1683
1684 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1685 if (rc < 0)
1686 return 0;
1687 else if (!cmd)
1688 return 0;
1689
1690 rc = iscsit_get_dataout(conn, cmd, hdr);
1691 if (rc < 0)
1692 return rc;
1693 else if (rc > 0)
1694 data_crc_failed = true;
1695
1696 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1697 }
1698
1699 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1700 struct iscsi_nopout *hdr)
1701 {
1702 u32 payload_length = ntoh24(hdr->dlength);
1703
1704 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1705 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1706 if (!cmd)
1707 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1708 (unsigned char *)hdr);
1709
1710 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1711 (unsigned char *)hdr);
1712 }
1713
1714 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1715 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1716 " not set, protocol error.\n");
1717 if (!cmd)
1718 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1719 (unsigned char *)hdr);
1720
1721 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1722 (unsigned char *)hdr);
1723 }
1724
1725 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1726 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1727 " greater than MaxXmitDataSegmentLength: %u, protocol"
1728 " error.\n", payload_length,
1729 conn->conn_ops->MaxXmitDataSegmentLength);
1730 if (!cmd)
1731 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1732 (unsigned char *)hdr);
1733
1734 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1735 (unsigned char *)hdr);
1736 }
1737
1738 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1739 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1740 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1741 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1742 payload_length);
1743 /*
1744 * This is not a response to a Unsolicited NopIN, which means
1745 * it can either be a NOPOUT ping request (with a valid ITT),
1746 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1747 * Either way, make sure we allocate an struct iscsi_cmd, as both
1748 * can contain ping data.
1749 */
1750 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1751 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1752 cmd->i_state = ISTATE_SEND_NOPIN;
1753 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1754 1 : 0);
1755 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1756 cmd->targ_xfer_tag = 0xFFFFFFFF;
1757 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1758 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1759 cmd->data_direction = DMA_NONE;
1760 }
1761
1762 return 0;
1763 }
1764 EXPORT_SYMBOL(iscsit_setup_nop_out);
1765
1766 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1767 struct iscsi_nopout *hdr)
1768 {
1769 struct iscsi_cmd *cmd_p = NULL;
1770 int cmdsn_ret = 0;
1771 /*
1772 * Initiator is expecting a NopIN ping reply..
1773 */
1774 if (hdr->itt != RESERVED_ITT) {
1775 if (!cmd)
1776 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1777 (unsigned char *)hdr);
1778
1779 spin_lock_bh(&conn->cmd_lock);
1780 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1781 spin_unlock_bh(&conn->cmd_lock);
1782
1783 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1784
1785 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1786 iscsit_add_cmd_to_response_queue(cmd, conn,
1787 cmd->i_state);
1788 return 0;
1789 }
1790
1791 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1792 (unsigned char *)hdr, hdr->cmdsn);
1793 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1794 return 0;
1795 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1796 return -1;
1797
1798 return 0;
1799 }
1800 /*
1801 * This was a response to a unsolicited NOPIN ping.
1802 */
1803 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1804 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1805 if (!cmd_p)
1806 return -EINVAL;
1807
1808 iscsit_stop_nopin_response_timer(conn);
1809
1810 cmd_p->i_state = ISTATE_REMOVE;
1811 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1812
1813 iscsit_start_nopin_timer(conn);
1814 return 0;
1815 }
1816 /*
1817 * Otherwise, initiator is not expecting a NOPIN is response.
1818 * Just ignore for now.
1819 */
1820
1821 if (cmd)
1822 iscsit_free_cmd(cmd, false);
1823
1824 return 0;
1825 }
1826 EXPORT_SYMBOL(iscsit_process_nop_out);
1827
1828 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1829 unsigned char *buf)
1830 {
1831 unsigned char *ping_data = NULL;
1832 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1833 struct kvec *iov = NULL;
1834 u32 payload_length = ntoh24(hdr->dlength);
1835 int ret;
1836
1837 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1838 if (ret < 0)
1839 return 0;
1840 /*
1841 * Handle NOP-OUT payload for traditional iSCSI sockets
1842 */
1843 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1844 u32 checksum, data_crc, padding = 0;
1845 int niov = 0, rx_got, rx_size = payload_length;
1846
1847 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1848 if (!ping_data) {
1849 ret = -1;
1850 goto out;
1851 }
1852
1853 iov = &cmd->iov_misc[0];
1854 iov[niov].iov_base = ping_data;
1855 iov[niov++].iov_len = payload_length;
1856
1857 padding = ((-payload_length) & 3);
1858 if (padding != 0) {
1859 pr_debug("Receiving %u additional bytes"
1860 " for padding.\n", padding);
1861 iov[niov].iov_base = &cmd->pad_bytes;
1862 iov[niov++].iov_len = padding;
1863 rx_size += padding;
1864 }
1865 if (conn->conn_ops->DataDigest) {
1866 iov[niov].iov_base = &checksum;
1867 iov[niov++].iov_len = ISCSI_CRC_LEN;
1868 rx_size += ISCSI_CRC_LEN;
1869 }
1870
1871 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1872 if (rx_got != rx_size) {
1873 ret = -1;
1874 goto out;
1875 }
1876
1877 if (conn->conn_ops->DataDigest) {
1878 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1879 payload_length, padding,
1880 cmd->pad_bytes, &data_crc);
1881
1882 if (checksum != data_crc) {
1883 pr_err("Ping data CRC32C DataDigest"
1884 " 0x%08x does not match computed 0x%08x\n",
1885 checksum, data_crc);
1886 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1887 pr_err("Unable to recover from"
1888 " NOPOUT Ping DataCRC failure while in"
1889 " ERL=0.\n");
1890 ret = -1;
1891 goto out;
1892 } else {
1893 /*
1894 * Silently drop this PDU and let the
1895 * initiator plug the CmdSN gap.
1896 */
1897 pr_debug("Dropping NOPOUT"
1898 " Command CmdSN: 0x%08x due to"
1899 " DataCRC error.\n", hdr->cmdsn);
1900 ret = 0;
1901 goto out;
1902 }
1903 } else {
1904 pr_debug("Got CRC32C DataDigest"
1905 " 0x%08x for %u bytes of ping data.\n",
1906 checksum, payload_length);
1907 }
1908 }
1909
1910 ping_data[payload_length] = '\0';
1911 /*
1912 * Attach ping data to struct iscsi_cmd->buf_ptr.
1913 */
1914 cmd->buf_ptr = ping_data;
1915 cmd->buf_ptr_size = payload_length;
1916
1917 pr_debug("Got %u bytes of NOPOUT ping"
1918 " data.\n", payload_length);
1919 pr_debug("Ping Data: \"%s\"\n", ping_data);
1920 }
1921
1922 return iscsit_process_nop_out(conn, cmd, hdr);
1923 out:
1924 if (cmd)
1925 iscsit_free_cmd(cmd, false);
1926
1927 kfree(ping_data);
1928 return ret;
1929 }
1930
1931 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1932 {
1933 switch (iscsi_tmf) {
1934 case ISCSI_TM_FUNC_ABORT_TASK:
1935 return TMR_ABORT_TASK;
1936 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1937 return TMR_ABORT_TASK_SET;
1938 case ISCSI_TM_FUNC_CLEAR_ACA:
1939 return TMR_CLEAR_ACA;
1940 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1941 return TMR_CLEAR_TASK_SET;
1942 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1943 return TMR_LUN_RESET;
1944 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1945 return TMR_TARGET_WARM_RESET;
1946 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1947 return TMR_TARGET_COLD_RESET;
1948 default:
1949 return TMR_UNKNOWN;
1950 }
1951 }
1952
1953 int
1954 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1955 unsigned char *buf)
1956 {
1957 struct se_tmr_req *se_tmr;
1958 struct iscsi_tmr_req *tmr_req;
1959 struct iscsi_tm *hdr;
1960 int out_of_order_cmdsn = 0, ret;
1961 u8 function, tcm_function = TMR_UNKNOWN;
1962
1963 hdr = (struct iscsi_tm *) buf;
1964 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1965 function = hdr->flags;
1966
1967 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1968 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1969 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1970 hdr->rtt, hdr->refcmdsn, conn->cid);
1971
1972 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1973 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1974 hdr->rtt != RESERVED_ITT)) {
1975 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1976 hdr->rtt = RESERVED_ITT;
1977 }
1978
1979 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1980 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1981 pr_err("Task Management Request TASK_REASSIGN not"
1982 " issued as immediate command, bad iSCSI Initiator"
1983 "implementation\n");
1984 return iscsit_add_reject_cmd(cmd,
1985 ISCSI_REASON_PROTOCOL_ERROR, buf);
1986 }
1987 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1988 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1989 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1990
1991 cmd->data_direction = DMA_NONE;
1992 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1993 if (!cmd->tmr_req) {
1994 return iscsit_add_reject_cmd(cmd,
1995 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1996 buf);
1997 }
1998
1999 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2000 conn->sess->se_sess, 0, DMA_NONE,
2001 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2002
2003 target_get_sess_cmd(&cmd->se_cmd, true);
2004
2005 /*
2006 * TASK_REASSIGN for ERL=2 / connection stays inside of
2007 * LIO-Target $FABRIC_MOD
2008 */
2009 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2010 tcm_function = iscsit_convert_tmf(function);
2011 if (tcm_function == TMR_UNKNOWN) {
2012 pr_err("Unknown iSCSI TMR Function:"
2013 " 0x%02x\n", function);
2014 return iscsit_add_reject_cmd(cmd,
2015 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2016 }
2017 }
2018 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2019 GFP_KERNEL);
2020 if (ret < 0)
2021 return iscsit_add_reject_cmd(cmd,
2022 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2023
2024 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2025
2026 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2027 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2028 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2029 cmd->init_task_tag = hdr->itt;
2030 cmd->targ_xfer_tag = 0xFFFFFFFF;
2031 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2032 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2033 se_tmr = cmd->se_cmd.se_tmr_req;
2034 tmr_req = cmd->tmr_req;
2035 /*
2036 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2037 */
2038 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2039 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2040 scsilun_to_int(&hdr->lun));
2041 if (ret < 0) {
2042 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2043 goto attach;
2044 }
2045 }
2046
2047 switch (function) {
2048 case ISCSI_TM_FUNC_ABORT_TASK:
2049 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2050 if (se_tmr->response)
2051 goto attach;
2052 break;
2053 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2054 case ISCSI_TM_FUNC_CLEAR_ACA:
2055 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2056 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2057 break;
2058 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2059 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2060 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2061 goto attach;
2062 }
2063 break;
2064 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2065 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2066 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2067 goto attach;
2068 }
2069 break;
2070 case ISCSI_TM_FUNC_TASK_REASSIGN:
2071 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2072 /*
2073 * Perform sanity checks on the ExpDataSN only if the
2074 * TASK_REASSIGN was successful.
2075 */
2076 if (se_tmr->response)
2077 break;
2078
2079 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2080 return iscsit_add_reject_cmd(cmd,
2081 ISCSI_REASON_BOOKMARK_INVALID, buf);
2082 break;
2083 default:
2084 pr_err("Unknown TMR function: 0x%02x, protocol"
2085 " error.\n", function);
2086 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2087 goto attach;
2088 }
2089
2090 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2091 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2092 se_tmr->call_transport = 1;
2093 attach:
2094 spin_lock_bh(&conn->cmd_lock);
2095 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2096 spin_unlock_bh(&conn->cmd_lock);
2097
2098 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2099 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2100 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2101 out_of_order_cmdsn = 1;
2102 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2103 target_put_sess_cmd(&cmd->se_cmd);
2104 return 0;
2105 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2106 return -1;
2107 }
2108 }
2109 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2110
2111 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2112 return 0;
2113 /*
2114 * Found the referenced task, send to transport for processing.
2115 */
2116 if (se_tmr->call_transport)
2117 return transport_generic_handle_tmr(&cmd->se_cmd);
2118
2119 /*
2120 * Could not find the referenced LUN, task, or Task Management
2121 * command not authorized or supported. Change state and
2122 * let the tx_thread send the response.
2123 *
2124 * For connection recovery, this is also the default action for
2125 * TMR TASK_REASSIGN.
2126 */
2127 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2128 target_put_sess_cmd(&cmd->se_cmd);
2129 return 0;
2130 }
2131 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2132
2133 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2134 int
2135 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2136 struct iscsi_text *hdr)
2137 {
2138 u32 payload_length = ntoh24(hdr->dlength);
2139
2140 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2141 pr_err("Unable to accept text parameter length: %u"
2142 "greater than MaxXmitDataSegmentLength %u.\n",
2143 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2144 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2145 (unsigned char *)hdr);
2146 }
2147
2148 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2149 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2150 pr_err("Multi sequence text commands currently not supported\n");
2151 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2152 (unsigned char *)hdr);
2153 }
2154
2155 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2156 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2157 hdr->exp_statsn, payload_length);
2158
2159 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2160 cmd->i_state = ISTATE_SEND_TEXTRSP;
2161 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2162 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2163 cmd->targ_xfer_tag = 0xFFFFFFFF;
2164 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2165 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2166 cmd->data_direction = DMA_NONE;
2167 kfree(cmd->text_in_ptr);
2168 cmd->text_in_ptr = NULL;
2169
2170 return 0;
2171 }
2172 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2173
2174 int
2175 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2176 struct iscsi_text *hdr)
2177 {
2178 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2179 int cmdsn_ret;
2180
2181 if (!text_in) {
2182 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2183 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2184 pr_err("Unable to locate text_in buffer for sendtargets"
2185 " discovery\n");
2186 goto reject;
2187 }
2188 goto empty_sendtargets;
2189 }
2190 if (strncmp("SendTargets", text_in, 11) != 0) {
2191 pr_err("Received Text Data that is not"
2192 " SendTargets, cannot continue.\n");
2193 goto reject;
2194 }
2195 text_ptr = strchr(text_in, '=');
2196 if (!text_ptr) {
2197 pr_err("No \"=\" separator found in Text Data,"
2198 " cannot continue.\n");
2199 goto reject;
2200 }
2201 if (!strncmp("=All", text_ptr, 4)) {
2202 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2203 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2204 !strncmp("=eui.", text_ptr, 5)) {
2205 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2206 } else {
2207 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2208 goto reject;
2209 }
2210
2211 spin_lock_bh(&conn->cmd_lock);
2212 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2213 spin_unlock_bh(&conn->cmd_lock);
2214
2215 empty_sendtargets:
2216 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2217
2218 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2219 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2220 (unsigned char *)hdr, hdr->cmdsn);
2221 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2222 return -1;
2223
2224 return 0;
2225 }
2226
2227 return iscsit_execute_cmd(cmd, 0);
2228
2229 reject:
2230 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2231 (unsigned char *)hdr);
2232 }
2233 EXPORT_SYMBOL(iscsit_process_text_cmd);
2234
2235 static int
2236 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2237 unsigned char *buf)
2238 {
2239 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2240 char *text_in = NULL;
2241 u32 payload_length = ntoh24(hdr->dlength);
2242 int rx_size, rc;
2243
2244 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2245 if (rc < 0)
2246 return 0;
2247
2248 rx_size = payload_length;
2249 if (payload_length) {
2250 u32 checksum = 0, data_crc = 0;
2251 u32 padding = 0, pad_bytes = 0;
2252 int niov = 0, rx_got;
2253 struct kvec iov[3];
2254
2255 text_in = kzalloc(payload_length, GFP_KERNEL);
2256 if (!text_in)
2257 goto reject;
2258
2259 cmd->text_in_ptr = text_in;
2260
2261 memset(iov, 0, 3 * sizeof(struct kvec));
2262 iov[niov].iov_base = text_in;
2263 iov[niov++].iov_len = payload_length;
2264
2265 padding = ((-payload_length) & 3);
2266 if (padding != 0) {
2267 iov[niov].iov_base = &pad_bytes;
2268 iov[niov++].iov_len = padding;
2269 rx_size += padding;
2270 pr_debug("Receiving %u additional bytes"
2271 " for padding.\n", padding);
2272 }
2273 if (conn->conn_ops->DataDigest) {
2274 iov[niov].iov_base = &checksum;
2275 iov[niov++].iov_len = ISCSI_CRC_LEN;
2276 rx_size += ISCSI_CRC_LEN;
2277 }
2278
2279 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2280 if (rx_got != rx_size)
2281 goto reject;
2282
2283 if (conn->conn_ops->DataDigest) {
2284 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, text_in,
2285 payload_length, padding,
2286 &pad_bytes, &data_crc);
2287
2288 if (checksum != data_crc) {
2289 pr_err("Text data CRC32C DataDigest"
2290 " 0x%08x does not match computed"
2291 " 0x%08x\n", checksum, data_crc);
2292 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2293 pr_err("Unable to recover from"
2294 " Text Data digest failure while in"
2295 " ERL=0.\n");
2296 goto reject;
2297 } else {
2298 /*
2299 * Silently drop this PDU and let the
2300 * initiator plug the CmdSN gap.
2301 */
2302 pr_debug("Dropping Text"
2303 " Command CmdSN: 0x%08x due to"
2304 " DataCRC error.\n", hdr->cmdsn);
2305 kfree(text_in);
2306 return 0;
2307 }
2308 } else {
2309 pr_debug("Got CRC32C DataDigest"
2310 " 0x%08x for %u bytes of text data.\n",
2311 checksum, payload_length);
2312 }
2313 }
2314 text_in[payload_length - 1] = '\0';
2315 pr_debug("Successfully read %d bytes of text"
2316 " data.\n", payload_length);
2317 }
2318
2319 return iscsit_process_text_cmd(conn, cmd, hdr);
2320
2321 reject:
2322 kfree(cmd->text_in_ptr);
2323 cmd->text_in_ptr = NULL;
2324 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2325 }
2326
2327 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2328 {
2329 struct iscsi_conn *conn_p;
2330 struct iscsi_session *sess = conn->sess;
2331
2332 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2333 " for SID: %u.\n", conn->cid, conn->sess->sid);
2334
2335 atomic_set(&sess->session_logout, 1);
2336 atomic_set(&conn->conn_logout_remove, 1);
2337 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2338
2339 iscsit_inc_conn_usage_count(conn);
2340 iscsit_inc_session_usage_count(sess);
2341
2342 spin_lock_bh(&sess->conn_lock);
2343 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2344 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2345 continue;
2346
2347 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2348 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2349 }
2350 spin_unlock_bh(&sess->conn_lock);
2351
2352 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2353
2354 return 0;
2355 }
2356
2357 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2358 {
2359 struct iscsi_conn *l_conn;
2360 struct iscsi_session *sess = conn->sess;
2361
2362 pr_debug("Received logout request CLOSECONNECTION for CID:"
2363 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2364
2365 /*
2366 * A Logout Request with a CLOSECONNECTION reason code for a CID
2367 * can arrive on a connection with a differing CID.
2368 */
2369 if (conn->cid == cmd->logout_cid) {
2370 spin_lock_bh(&conn->state_lock);
2371 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2372 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2373
2374 atomic_set(&conn->conn_logout_remove, 1);
2375 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2376 iscsit_inc_conn_usage_count(conn);
2377
2378 spin_unlock_bh(&conn->state_lock);
2379 } else {
2380 /*
2381 * Handle all different cid CLOSECONNECTION requests in
2382 * iscsit_logout_post_handler_diffcid() as to give enough
2383 * time for any non immediate command's CmdSN to be
2384 * acknowledged on the connection in question.
2385 *
2386 * Here we simply make sure the CID is still around.
2387 */
2388 l_conn = iscsit_get_conn_from_cid(sess,
2389 cmd->logout_cid);
2390 if (!l_conn) {
2391 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2392 iscsit_add_cmd_to_response_queue(cmd, conn,
2393 cmd->i_state);
2394 return 0;
2395 }
2396
2397 iscsit_dec_conn_usage_count(l_conn);
2398 }
2399
2400 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2401
2402 return 0;
2403 }
2404
2405 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2406 {
2407 struct iscsi_session *sess = conn->sess;
2408
2409 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2410 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2411
2412 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2413 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2414 " while ERL!=2.\n");
2415 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2416 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2417 return 0;
2418 }
2419
2420 if (conn->cid == cmd->logout_cid) {
2421 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2422 " with CID: %hu on CID: %hu, implementation error.\n",
2423 cmd->logout_cid, conn->cid);
2424 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2425 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2426 return 0;
2427 }
2428
2429 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2430
2431 return 0;
2432 }
2433
2434 int
2435 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2436 unsigned char *buf)
2437 {
2438 int cmdsn_ret, logout_remove = 0;
2439 u8 reason_code = 0;
2440 struct iscsi_logout *hdr;
2441 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2442
2443 hdr = (struct iscsi_logout *) buf;
2444 reason_code = (hdr->flags & 0x7f);
2445
2446 if (tiqn) {
2447 spin_lock(&tiqn->logout_stats.lock);
2448 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2449 tiqn->logout_stats.normal_logouts++;
2450 else
2451 tiqn->logout_stats.abnormal_logouts++;
2452 spin_unlock(&tiqn->logout_stats.lock);
2453 }
2454
2455 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2456 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2457 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2458 hdr->cid, conn->cid);
2459
2460 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2461 pr_err("Received logout request on connection that"
2462 " is not in logged in state, ignoring request.\n");
2463 iscsit_free_cmd(cmd, false);
2464 return 0;
2465 }
2466
2467 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2468 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2469 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2470 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2471 cmd->targ_xfer_tag = 0xFFFFFFFF;
2472 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2473 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2474 cmd->logout_cid = be16_to_cpu(hdr->cid);
2475 cmd->logout_reason = reason_code;
2476 cmd->data_direction = DMA_NONE;
2477
2478 /*
2479 * We need to sleep in these cases (by returning 1) until the Logout
2480 * Response gets sent in the tx thread.
2481 */
2482 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2483 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2484 be16_to_cpu(hdr->cid) == conn->cid))
2485 logout_remove = 1;
2486
2487 spin_lock_bh(&conn->cmd_lock);
2488 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2489 spin_unlock_bh(&conn->cmd_lock);
2490
2491 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2492 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2493
2494 /*
2495 * Immediate commands are executed, well, immediately.
2496 * Non-Immediate Logout Commands are executed in CmdSN order.
2497 */
2498 if (cmd->immediate_cmd) {
2499 int ret = iscsit_execute_cmd(cmd, 0);
2500
2501 if (ret < 0)
2502 return ret;
2503 } else {
2504 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2505 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2506 logout_remove = 0;
2507 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2508 return -1;
2509 }
2510
2511 return logout_remove;
2512 }
2513 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2514
2515 int iscsit_handle_snack(
2516 struct iscsi_conn *conn,
2517 unsigned char *buf)
2518 {
2519 struct iscsi_snack *hdr;
2520
2521 hdr = (struct iscsi_snack *) buf;
2522 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2523
2524 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2525 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2526 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2527 hdr->begrun, hdr->runlength, conn->cid);
2528
2529 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2530 pr_err("Initiator sent SNACK request while in"
2531 " ErrorRecoveryLevel=0.\n");
2532 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2533 buf);
2534 }
2535 /*
2536 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2537 * call from inside iscsi_send_recovery_datain_or_r2t().
2538 */
2539 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2540 case 0:
2541 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2542 hdr->itt,
2543 be32_to_cpu(hdr->ttt),
2544 be32_to_cpu(hdr->begrun),
2545 be32_to_cpu(hdr->runlength));
2546 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2547 return iscsit_handle_status_snack(conn, hdr->itt,
2548 be32_to_cpu(hdr->ttt),
2549 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2550 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2551 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2552 be32_to_cpu(hdr->begrun),
2553 be32_to_cpu(hdr->runlength));
2554 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2555 /* FIXME: Support R-Data SNACK */
2556 pr_err("R-Data SNACK Not Supported.\n");
2557 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2558 buf);
2559 default:
2560 pr_err("Unknown SNACK type 0x%02x, protocol"
2561 " error.\n", hdr->flags & 0x0f);
2562 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2563 buf);
2564 }
2565
2566 return 0;
2567 }
2568 EXPORT_SYMBOL(iscsit_handle_snack);
2569
2570 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2571 {
2572 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2573 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2574 wait_for_completion_interruptible_timeout(
2575 &conn->rx_half_close_comp,
2576 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2577 }
2578 }
2579
2580 static int iscsit_handle_immediate_data(
2581 struct iscsi_cmd *cmd,
2582 struct iscsi_scsi_req *hdr,
2583 u32 length)
2584 {
2585 int iov_ret, rx_got = 0, rx_size = 0;
2586 u32 checksum, iov_count = 0, padding = 0;
2587 struct iscsi_conn *conn = cmd->conn;
2588 struct kvec *iov;
2589
2590 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2591 if (iov_ret < 0)
2592 return IMMEDIATE_DATA_CANNOT_RECOVER;
2593
2594 rx_size = length;
2595 iov_count = iov_ret;
2596 iov = &cmd->iov_data[0];
2597
2598 padding = ((-length) & 3);
2599 if (padding != 0) {
2600 iov[iov_count].iov_base = cmd->pad_bytes;
2601 iov[iov_count++].iov_len = padding;
2602 rx_size += padding;
2603 }
2604
2605 if (conn->conn_ops->DataDigest) {
2606 iov[iov_count].iov_base = &checksum;
2607 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2608 rx_size += ISCSI_CRC_LEN;
2609 }
2610
2611 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2612
2613 iscsit_unmap_iovec(cmd);
2614
2615 if (rx_got != rx_size) {
2616 iscsit_rx_thread_wait_for_tcp(conn);
2617 return IMMEDIATE_DATA_CANNOT_RECOVER;
2618 }
2619
2620 if (conn->conn_ops->DataDigest) {
2621 u32 data_crc;
2622
2623 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2624 cmd->write_data_done, length, padding,
2625 cmd->pad_bytes);
2626
2627 if (checksum != data_crc) {
2628 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2629 " does not match computed 0x%08x\n", checksum,
2630 data_crc);
2631
2632 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2633 pr_err("Unable to recover from"
2634 " Immediate Data digest failure while"
2635 " in ERL=0.\n");
2636 iscsit_reject_cmd(cmd,
2637 ISCSI_REASON_DATA_DIGEST_ERROR,
2638 (unsigned char *)hdr);
2639 return IMMEDIATE_DATA_CANNOT_RECOVER;
2640 } else {
2641 iscsit_reject_cmd(cmd,
2642 ISCSI_REASON_DATA_DIGEST_ERROR,
2643 (unsigned char *)hdr);
2644 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2645 }
2646 } else {
2647 pr_debug("Got CRC32C DataDigest 0x%08x for"
2648 " %u bytes of Immediate Data\n", checksum,
2649 length);
2650 }
2651 }
2652
2653 cmd->write_data_done += length;
2654
2655 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2656 spin_lock_bh(&cmd->istate_lock);
2657 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2658 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2659 spin_unlock_bh(&cmd->istate_lock);
2660 }
2661
2662 return IMMEDIATE_DATA_NORMAL_OPERATION;
2663 }
2664
2665 /*
2666 * Called with sess->conn_lock held.
2667 */
2668 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2669 with active network interface */
2670 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2671 {
2672 struct iscsi_cmd *cmd;
2673 struct iscsi_conn *conn_p;
2674 bool found = false;
2675
2676 /*
2677 * Only send a Asynchronous Message on connections whos network
2678 * interface is still functional.
2679 */
2680 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2681 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2682 iscsit_inc_conn_usage_count(conn_p);
2683 found = true;
2684 break;
2685 }
2686 }
2687
2688 if (!found)
2689 return;
2690
2691 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2692 if (!cmd) {
2693 iscsit_dec_conn_usage_count(conn_p);
2694 return;
2695 }
2696
2697 cmd->logout_cid = conn->cid;
2698 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2699 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2700
2701 spin_lock_bh(&conn_p->cmd_lock);
2702 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2703 spin_unlock_bh(&conn_p->cmd_lock);
2704
2705 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2706 iscsit_dec_conn_usage_count(conn_p);
2707 }
2708
2709 static int iscsit_send_conn_drop_async_message(
2710 struct iscsi_cmd *cmd,
2711 struct iscsi_conn *conn)
2712 {
2713 struct iscsi_async *hdr;
2714
2715 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2716
2717 hdr = (struct iscsi_async *) cmd->pdu;
2718 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2719 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2720 cmd->init_task_tag = RESERVED_ITT;
2721 cmd->targ_xfer_tag = 0xFFFFFFFF;
2722 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2723 cmd->stat_sn = conn->stat_sn++;
2724 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2725 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2726 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2727 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2728 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2729 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2730 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2731
2732 pr_debug("Sending Connection Dropped Async Message StatSN:"
2733 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2734 cmd->logout_cid, conn->cid);
2735
2736 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2737 }
2738
2739 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2740 {
2741 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2742 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2743 wait_for_completion_interruptible_timeout(
2744 &conn->tx_half_close_comp,
2745 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2746 }
2747 }
2748
2749 void
2750 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2751 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2752 bool set_statsn)
2753 {
2754 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2755 hdr->flags = datain->flags;
2756 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2757 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2758 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2759 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2760 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2761 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2762 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2763 }
2764 }
2765 hton24(hdr->dlength, datain->length);
2766 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2767 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2768 (struct scsi_lun *)&hdr->lun);
2769 else
2770 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2771
2772 hdr->itt = cmd->init_task_tag;
2773
2774 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2775 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2776 else
2777 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2778 if (set_statsn)
2779 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2780 else
2781 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2782
2783 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2784 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2785 hdr->datasn = cpu_to_be32(datain->data_sn);
2786 hdr->offset = cpu_to_be32(datain->offset);
2787
2788 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2789 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2790 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2791 ntohl(hdr->offset), datain->length, conn->cid);
2792 }
2793 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2794
2795 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2796 {
2797 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2798 struct iscsi_datain datain;
2799 struct iscsi_datain_req *dr;
2800 int eodr = 0, ret;
2801 bool set_statsn = false;
2802
2803 memset(&datain, 0, sizeof(struct iscsi_datain));
2804 dr = iscsit_get_datain_values(cmd, &datain);
2805 if (!dr) {
2806 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2807 cmd->init_task_tag);
2808 return -1;
2809 }
2810 /*
2811 * Be paranoid and double check the logic for now.
2812 */
2813 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2814 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2815 " datain.length: %u exceeds cmd->data_length: %u\n",
2816 cmd->init_task_tag, datain.offset, datain.length,
2817 cmd->se_cmd.data_length);
2818 return -1;
2819 }
2820
2821 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2822 /*
2823 * Special case for successfully execution w/ both DATAIN
2824 * and Sense Data.
2825 */
2826 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2827 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2828 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2829 else {
2830 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2831 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2832 iscsit_increment_maxcmdsn(cmd, conn->sess);
2833 cmd->stat_sn = conn->stat_sn++;
2834 set_statsn = true;
2835 } else if (dr->dr_complete ==
2836 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2837 set_statsn = true;
2838 }
2839
2840 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2841
2842 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2843 if (ret < 0)
2844 return ret;
2845
2846 if (dr->dr_complete) {
2847 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2848 2 : 1;
2849 iscsit_free_datain_req(cmd, dr);
2850 }
2851
2852 return eodr;
2853 }
2854
2855 int
2856 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2857 struct iscsi_logout_rsp *hdr)
2858 {
2859 struct iscsi_conn *logout_conn = NULL;
2860 struct iscsi_conn_recovery *cr = NULL;
2861 struct iscsi_session *sess = conn->sess;
2862 /*
2863 * The actual shutting down of Sessions and/or Connections
2864 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2865 * is done in scsi_logout_post_handler().
2866 */
2867 switch (cmd->logout_reason) {
2868 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2869 pr_debug("iSCSI session logout successful, setting"
2870 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2871 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2872 break;
2873 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2874 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2875 break;
2876 /*
2877 * For CLOSECONNECTION logout requests carrying
2878 * a matching logout CID -> local CID, the reference
2879 * for the local CID will have been incremented in
2880 * iscsi_logout_closeconnection().
2881 *
2882 * For CLOSECONNECTION logout requests carrying
2883 * a different CID than the connection it arrived
2884 * on, the connection responding to cmd->logout_cid
2885 * is stopped in iscsit_logout_post_handler_diffcid().
2886 */
2887
2888 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2889 " successful.\n", cmd->logout_cid, conn->cid);
2890 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2891 break;
2892 case ISCSI_LOGOUT_REASON_RECOVERY:
2893 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2894 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2895 break;
2896 /*
2897 * If the connection is still active from our point of view
2898 * force connection recovery to occur.
2899 */
2900 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2901 cmd->logout_cid);
2902 if (logout_conn) {
2903 iscsit_connection_reinstatement_rcfr(logout_conn);
2904 iscsit_dec_conn_usage_count(logout_conn);
2905 }
2906
2907 cr = iscsit_get_inactive_connection_recovery_entry(
2908 conn->sess, cmd->logout_cid);
2909 if (!cr) {
2910 pr_err("Unable to locate CID: %hu for"
2911 " REMOVECONNFORRECOVERY Logout Request.\n",
2912 cmd->logout_cid);
2913 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2914 break;
2915 }
2916
2917 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2918
2919 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2920 " for recovery for CID: %hu on CID: %hu successful.\n",
2921 cmd->logout_cid, conn->cid);
2922 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2923 break;
2924 default:
2925 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2926 cmd->logout_reason);
2927 return -1;
2928 }
2929
2930 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2931 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2932 hdr->response = cmd->logout_response;
2933 hdr->itt = cmd->init_task_tag;
2934 cmd->stat_sn = conn->stat_sn++;
2935 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2936
2937 iscsit_increment_maxcmdsn(cmd, conn->sess);
2938 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2939 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2940
2941 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2942 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2943 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2944 cmd->logout_cid, conn->cid);
2945
2946 return 0;
2947 }
2948 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2949
2950 static int
2951 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2952 {
2953 int rc;
2954
2955 rc = iscsit_build_logout_rsp(cmd, conn,
2956 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2957 if (rc < 0)
2958 return rc;
2959
2960 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2961 }
2962
2963 void
2964 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2965 struct iscsi_nopin *hdr, bool nopout_response)
2966 {
2967 hdr->opcode = ISCSI_OP_NOOP_IN;
2968 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2969 hton24(hdr->dlength, cmd->buf_ptr_size);
2970 if (nopout_response)
2971 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2972 hdr->itt = cmd->init_task_tag;
2973 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2974 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2975 conn->stat_sn;
2976 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2977
2978 if (nopout_response)
2979 iscsit_increment_maxcmdsn(cmd, conn->sess);
2980
2981 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2982 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2983
2984 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2985 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2986 "Solicited" : "Unsolicited", cmd->init_task_tag,
2987 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2988 }
2989 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2990
2991 /*
2992 * Unsolicited NOPIN, either requesting a response or not.
2993 */
2994 static int iscsit_send_unsolicited_nopin(
2995 struct iscsi_cmd *cmd,
2996 struct iscsi_conn *conn,
2997 int want_response)
2998 {
2999 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3000 int ret;
3001
3002 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3003
3004 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3005 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3006
3007 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3008 if (ret < 0)
3009 return ret;
3010
3011 spin_lock_bh(&cmd->istate_lock);
3012 cmd->i_state = want_response ?
3013 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3014 spin_unlock_bh(&cmd->istate_lock);
3015
3016 return 0;
3017 }
3018
3019 static int
3020 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3021 {
3022 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3023
3024 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3025
3026 /*
3027 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3028 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3029 */
3030 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3031
3032 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3033 cmd->buf_ptr,
3034 cmd->buf_ptr_size);
3035 }
3036
3037 static int iscsit_send_r2t(
3038 struct iscsi_cmd *cmd,
3039 struct iscsi_conn *conn)
3040 {
3041 struct iscsi_r2t *r2t;
3042 struct iscsi_r2t_rsp *hdr;
3043 int ret;
3044
3045 r2t = iscsit_get_r2t_from_list(cmd);
3046 if (!r2t)
3047 return -1;
3048
3049 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3050 memset(hdr, 0, ISCSI_HDR_LEN);
3051 hdr->opcode = ISCSI_OP_R2T;
3052 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3053 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3054 (struct scsi_lun *)&hdr->lun);
3055 hdr->itt = cmd->init_task_tag;
3056 if (conn->conn_transport->iscsit_get_r2t_ttt)
3057 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3058 else
3059 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3060 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3061 hdr->statsn = cpu_to_be32(conn->stat_sn);
3062 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3063 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3064 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3065 hdr->data_offset = cpu_to_be32(r2t->offset);
3066 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3067
3068 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3069 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3070 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3071 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3072 r2t->offset, r2t->xfer_len, conn->cid);
3073
3074 spin_lock_bh(&cmd->r2t_lock);
3075 r2t->sent_r2t = 1;
3076 spin_unlock_bh(&cmd->r2t_lock);
3077
3078 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3079 if (ret < 0) {
3080 return ret;
3081 }
3082
3083 spin_lock_bh(&cmd->dataout_timeout_lock);
3084 iscsit_start_dataout_timer(cmd, conn);
3085 spin_unlock_bh(&cmd->dataout_timeout_lock);
3086
3087 return 0;
3088 }
3089
3090 /*
3091 * @recovery: If called from iscsi_task_reassign_complete_write() for
3092 * connection recovery.
3093 */
3094 int iscsit_build_r2ts_for_cmd(
3095 struct iscsi_conn *conn,
3096 struct iscsi_cmd *cmd,
3097 bool recovery)
3098 {
3099 int first_r2t = 1;
3100 u32 offset = 0, xfer_len = 0;
3101
3102 spin_lock_bh(&cmd->r2t_lock);
3103 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3104 spin_unlock_bh(&cmd->r2t_lock);
3105 return 0;
3106 }
3107
3108 if (conn->sess->sess_ops->DataSequenceInOrder &&
3109 !recovery)
3110 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3111
3112 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3113 if (conn->sess->sess_ops->DataSequenceInOrder) {
3114 offset = cmd->r2t_offset;
3115
3116 if (first_r2t && recovery) {
3117 int new_data_end = offset +
3118 conn->sess->sess_ops->MaxBurstLength -
3119 cmd->next_burst_len;
3120
3121 if (new_data_end > cmd->se_cmd.data_length)
3122 xfer_len = cmd->se_cmd.data_length - offset;
3123 else
3124 xfer_len =
3125 conn->sess->sess_ops->MaxBurstLength -
3126 cmd->next_burst_len;
3127 } else {
3128 int new_data_end = offset +
3129 conn->sess->sess_ops->MaxBurstLength;
3130
3131 if (new_data_end > cmd->se_cmd.data_length)
3132 xfer_len = cmd->se_cmd.data_length - offset;
3133 else
3134 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3135 }
3136 cmd->r2t_offset += xfer_len;
3137
3138 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3139 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3140 } else {
3141 struct iscsi_seq *seq;
3142
3143 seq = iscsit_get_seq_holder_for_r2t(cmd);
3144 if (!seq) {
3145 spin_unlock_bh(&cmd->r2t_lock);
3146 return -1;
3147 }
3148
3149 offset = seq->offset;
3150 xfer_len = seq->xfer_len;
3151
3152 if (cmd->seq_send_order == cmd->seq_count)
3153 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3154 }
3155 cmd->outstanding_r2ts++;
3156 first_r2t = 0;
3157
3158 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3159 spin_unlock_bh(&cmd->r2t_lock);
3160 return -1;
3161 }
3162
3163 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3164 break;
3165 }
3166 spin_unlock_bh(&cmd->r2t_lock);
3167
3168 return 0;
3169 }
3170 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3171
3172 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3173 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3174 {
3175 if (inc_stat_sn)
3176 cmd->stat_sn = conn->stat_sn++;
3177
3178 atomic_long_inc(&conn->sess->rsp_pdus);
3179
3180 memset(hdr, 0, ISCSI_HDR_LEN);
3181 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3182 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3183 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3184 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3185 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3186 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3187 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3188 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3189 }
3190 hdr->response = cmd->iscsi_response;
3191 hdr->cmd_status = cmd->se_cmd.scsi_status;
3192 hdr->itt = cmd->init_task_tag;
3193 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3194
3195 iscsit_increment_maxcmdsn(cmd, conn->sess);
3196 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3197 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3198
3199 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3200 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3201 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3202 cmd->se_cmd.scsi_status, conn->cid);
3203 }
3204 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3205
3206 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3207 {
3208 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3209 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3210 void *data_buf = NULL;
3211 u32 padding = 0, data_buf_len = 0;
3212
3213 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3214
3215 /*
3216 * Attach SENSE DATA payload to iSCSI Response PDU
3217 */
3218 if (cmd->se_cmd.sense_buffer &&
3219 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3220 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3221 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3222 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3223
3224 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3225 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3226 data_buf = cmd->sense_buffer;
3227 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3228
3229 if (padding) {
3230 memset(cmd->sense_buffer +
3231 cmd->se_cmd.scsi_sense_length, 0, padding);
3232 pr_debug("Adding %u bytes of padding to"
3233 " SENSE.\n", padding);
3234 }
3235
3236 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3237 " Response PDU\n",
3238 cmd->se_cmd.scsi_sense_length);
3239 }
3240
3241 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3242 data_buf_len);
3243 }
3244
3245 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3246 {
3247 switch (se_tmr->response) {
3248 case TMR_FUNCTION_COMPLETE:
3249 return ISCSI_TMF_RSP_COMPLETE;
3250 case TMR_TASK_DOES_NOT_EXIST:
3251 return ISCSI_TMF_RSP_NO_TASK;
3252 case TMR_LUN_DOES_NOT_EXIST:
3253 return ISCSI_TMF_RSP_NO_LUN;
3254 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3255 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3256 case TMR_FUNCTION_REJECTED:
3257 default:
3258 return ISCSI_TMF_RSP_REJECTED;
3259 }
3260 }
3261
3262 void
3263 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3264 struct iscsi_tm_rsp *hdr)
3265 {
3266 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3267
3268 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3269 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3270 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3271 hdr->itt = cmd->init_task_tag;
3272 cmd->stat_sn = conn->stat_sn++;
3273 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3274
3275 iscsit_increment_maxcmdsn(cmd, conn->sess);
3276 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3277 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3278
3279 pr_debug("Built Task Management Response ITT: 0x%08x,"
3280 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3281 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3282 }
3283 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3284
3285 static int
3286 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3287 {
3288 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3289
3290 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3291
3292 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3293 }
3294
3295 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3296 {
3297 bool ret = false;
3298
3299 if (np->np_sockaddr.ss_family == AF_INET6) {
3300 const struct sockaddr_in6 sin6 = {
3301 .sin6_addr = IN6ADDR_ANY_INIT };
3302 struct sockaddr_in6 *sock_in6 =
3303 (struct sockaddr_in6 *)&np->np_sockaddr;
3304
3305 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3306 sin6.sin6_addr.s6_addr, 16))
3307 ret = true;
3308 } else {
3309 struct sockaddr_in * sock_in =
3310 (struct sockaddr_in *)&np->np_sockaddr;
3311
3312 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3313 ret = true;
3314 }
3315
3316 return ret;
3317 }
3318
3319 #define SENDTARGETS_BUF_LIMIT 32768U
3320
3321 static int
3322 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3323 enum iscsit_transport_type network_transport,
3324 int skip_bytes, bool *completed)
3325 {
3326 char *payload = NULL;
3327 struct iscsi_conn *conn = cmd->conn;
3328 struct iscsi_portal_group *tpg;
3329 struct iscsi_tiqn *tiqn;
3330 struct iscsi_tpg_np *tpg_np;
3331 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3332 int target_name_printed;
3333 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3334 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3335 bool active;
3336
3337 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3338 SENDTARGETS_BUF_LIMIT);
3339
3340 payload = kzalloc(buffer_len, GFP_KERNEL);
3341 if (!payload)
3342 return -ENOMEM;
3343
3344 /*
3345 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3346 * explicit case..
3347 */
3348 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3349 text_ptr = strchr(text_in, '=');
3350 if (!text_ptr) {
3351 pr_err("Unable to locate '=' string in text_in:"
3352 " %s\n", text_in);
3353 kfree(payload);
3354 return -EINVAL;
3355 }
3356 /*
3357 * Skip over '=' character..
3358 */
3359 text_ptr += 1;
3360 }
3361
3362 spin_lock(&tiqn_lock);
3363 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3364 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3365 strcmp(tiqn->tiqn, text_ptr)) {
3366 continue;
3367 }
3368
3369 target_name_printed = 0;
3370
3371 spin_lock(&tiqn->tiqn_tpg_lock);
3372 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3373
3374 /* If demo_mode_discovery=0 and generate_node_acls=0
3375 * (demo mode dislabed) do not return
3376 * TargetName+TargetAddress unless a NodeACL exists.
3377 */
3378
3379 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3380 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3381 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3382 cmd->conn->sess->sess_ops->InitiatorName))) {
3383 continue;
3384 }
3385
3386 spin_lock(&tpg->tpg_state_lock);
3387 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3388 spin_unlock(&tpg->tpg_state_lock);
3389
3390 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3391 continue;
3392
3393 spin_lock(&tpg->tpg_np_lock);
3394 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3395 tpg_np_list) {
3396 struct iscsi_np *np = tpg_np->tpg_np;
3397 bool inaddr_any = iscsit_check_inaddr_any(np);
3398 struct sockaddr_storage *sockaddr;
3399
3400 if (np->np_network_transport != network_transport)
3401 continue;
3402
3403 if (!target_name_printed) {
3404 len = sprintf(buf, "TargetName=%s",
3405 tiqn->tiqn);
3406 len += 1;
3407
3408 if ((len + payload_len) > buffer_len) {
3409 spin_unlock(&tpg->tpg_np_lock);
3410 spin_unlock(&tiqn->tiqn_tpg_lock);
3411 end_of_buf = 1;
3412 goto eob;
3413 }
3414
3415 if (skip_bytes && len <= skip_bytes) {
3416 skip_bytes -= len;
3417 } else {
3418 memcpy(payload + payload_len, buf, len);
3419 payload_len += len;
3420 target_name_printed = 1;
3421 if (len > skip_bytes)
3422 skip_bytes = 0;
3423 }
3424 }
3425
3426 if (inaddr_any)
3427 sockaddr = &conn->local_sockaddr;
3428 else
3429 sockaddr = &np->np_sockaddr;
3430
3431 len = sprintf(buf, "TargetAddress="
3432 "%pISpc,%hu",
3433 sockaddr,
3434 tpg->tpgt);
3435 len += 1;
3436
3437 if ((len + payload_len) > buffer_len) {
3438 spin_unlock(&tpg->tpg_np_lock);
3439 spin_unlock(&tiqn->tiqn_tpg_lock);
3440 end_of_buf = 1;
3441 goto eob;
3442 }
3443
3444 if (skip_bytes && len <= skip_bytes) {
3445 skip_bytes -= len;
3446 } else {
3447 memcpy(payload + payload_len, buf, len);
3448 payload_len += len;
3449 if (len > skip_bytes)
3450 skip_bytes = 0;
3451 }
3452 }
3453 spin_unlock(&tpg->tpg_np_lock);
3454 }
3455 spin_unlock(&tiqn->tiqn_tpg_lock);
3456 eob:
3457 if (end_of_buf) {
3458 *completed = false;
3459 break;
3460 }
3461
3462 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3463 break;
3464 }
3465 spin_unlock(&tiqn_lock);
3466
3467 cmd->buf_ptr = payload;
3468
3469 return payload_len;
3470 }
3471
3472 int
3473 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3474 struct iscsi_text_rsp *hdr,
3475 enum iscsit_transport_type network_transport)
3476 {
3477 int text_length, padding;
3478 bool completed = true;
3479
3480 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3481 cmd->read_data_done,
3482 &completed);
3483 if (text_length < 0)
3484 return text_length;
3485
3486 if (completed) {
3487 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3488 } else {
3489 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3490 cmd->read_data_done += text_length;
3491 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3492 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3493 }
3494 hdr->opcode = ISCSI_OP_TEXT_RSP;
3495 padding = ((-text_length) & 3);
3496 hton24(hdr->dlength, text_length);
3497 hdr->itt = cmd->init_task_tag;
3498 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3499 cmd->stat_sn = conn->stat_sn++;
3500 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3501
3502 iscsit_increment_maxcmdsn(cmd, conn->sess);
3503 /*
3504 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3505 * correctly increment MaxCmdSN for each response answering a
3506 * non immediate text request with a valid CmdSN.
3507 */
3508 cmd->maxcmdsn_inc = 0;
3509 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3510 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3511
3512 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3513 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3514 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3515 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3516 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3517
3518 return text_length + padding;
3519 }
3520 EXPORT_SYMBOL(iscsit_build_text_rsp);
3521
3522 static int iscsit_send_text_rsp(
3523 struct iscsi_cmd *cmd,
3524 struct iscsi_conn *conn)
3525 {
3526 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3527 int text_length;
3528
3529 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3530 conn->conn_transport->transport_type);
3531 if (text_length < 0)
3532 return text_length;
3533
3534 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3535 cmd->buf_ptr,
3536 text_length);
3537 }
3538
3539 void
3540 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3541 struct iscsi_reject *hdr)
3542 {
3543 hdr->opcode = ISCSI_OP_REJECT;
3544 hdr->reason = cmd->reject_reason;
3545 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3546 hton24(hdr->dlength, ISCSI_HDR_LEN);
3547 hdr->ffffffff = cpu_to_be32(0xffffffff);
3548 cmd->stat_sn = conn->stat_sn++;
3549 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3550 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3551 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3552
3553 }
3554 EXPORT_SYMBOL(iscsit_build_reject);
3555
3556 static int iscsit_send_reject(
3557 struct iscsi_cmd *cmd,
3558 struct iscsi_conn *conn)
3559 {
3560 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3561
3562 iscsit_build_reject(cmd, conn, hdr);
3563
3564 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3565 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3566
3567 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3568 cmd->buf_ptr,
3569 ISCSI_HDR_LEN);
3570 }
3571
3572 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3573 {
3574 int ord, cpu;
3575 /*
3576 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3577 * within iscsit_start_kthreads()
3578 *
3579 * Here we use bitmap_id to determine which CPU that this
3580 * iSCSI connection's RX/TX threads will be scheduled to
3581 * execute upon.
3582 */
3583 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3584 for_each_online_cpu(cpu) {
3585 if (ord-- == 0) {
3586 cpumask_set_cpu(cpu, conn->conn_cpumask);
3587 return;
3588 }
3589 }
3590 /*
3591 * This should never be reached..
3592 */
3593 dump_stack();
3594 cpumask_setall(conn->conn_cpumask);
3595 }
3596
3597 int
3598 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3599 {
3600 int ret;
3601
3602 switch (state) {
3603 case ISTATE_SEND_R2T:
3604 ret = iscsit_send_r2t(cmd, conn);
3605 if (ret < 0)
3606 goto err;
3607 break;
3608 case ISTATE_REMOVE:
3609 spin_lock_bh(&conn->cmd_lock);
3610 list_del_init(&cmd->i_conn_node);
3611 spin_unlock_bh(&conn->cmd_lock);
3612
3613 iscsit_free_cmd(cmd, false);
3614 break;
3615 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3616 iscsit_mod_nopin_response_timer(conn);
3617 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3618 if (ret < 0)
3619 goto err;
3620 break;
3621 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3622 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3623 if (ret < 0)
3624 goto err;
3625 break;
3626 default:
3627 pr_err("Unknown Opcode: 0x%02x ITT:"
3628 " 0x%08x, i_state: %d on CID: %hu\n",
3629 cmd->iscsi_opcode, cmd->init_task_tag, state,
3630 conn->cid);
3631 goto err;
3632 }
3633
3634 return 0;
3635
3636 err:
3637 return -1;
3638 }
3639 EXPORT_SYMBOL(iscsit_immediate_queue);
3640
3641 static int
3642 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3643 {
3644 struct iscsit_transport *t = conn->conn_transport;
3645 struct iscsi_queue_req *qr;
3646 struct iscsi_cmd *cmd;
3647 u8 state;
3648 int ret;
3649
3650 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3651 atomic_set(&conn->check_immediate_queue, 0);
3652 cmd = qr->cmd;
3653 state = qr->state;
3654 kmem_cache_free(lio_qr_cache, qr);
3655
3656 ret = t->iscsit_immediate_queue(conn, cmd, state);
3657 if (ret < 0)
3658 return ret;
3659 }
3660
3661 return 0;
3662 }
3663
3664 int
3665 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3666 {
3667 int ret;
3668
3669 check_rsp_state:
3670 switch (state) {
3671 case ISTATE_SEND_DATAIN:
3672 ret = iscsit_send_datain(cmd, conn);
3673 if (ret < 0)
3674 goto err;
3675 else if (!ret)
3676 /* more drs */
3677 goto check_rsp_state;
3678 else if (ret == 1) {
3679 /* all done */
3680 spin_lock_bh(&cmd->istate_lock);
3681 cmd->i_state = ISTATE_SENT_STATUS;
3682 spin_unlock_bh(&cmd->istate_lock);
3683
3684 if (atomic_read(&conn->check_immediate_queue))
3685 return 1;
3686
3687 return 0;
3688 } else if (ret == 2) {
3689 /* Still must send status,
3690 SCF_TRANSPORT_TASK_SENSE was set */
3691 spin_lock_bh(&cmd->istate_lock);
3692 cmd->i_state = ISTATE_SEND_STATUS;
3693 spin_unlock_bh(&cmd->istate_lock);
3694 state = ISTATE_SEND_STATUS;
3695 goto check_rsp_state;
3696 }
3697
3698 break;
3699 case ISTATE_SEND_STATUS:
3700 case ISTATE_SEND_STATUS_RECOVERY:
3701 ret = iscsit_send_response(cmd, conn);
3702 break;
3703 case ISTATE_SEND_LOGOUTRSP:
3704 ret = iscsit_send_logout(cmd, conn);
3705 break;
3706 case ISTATE_SEND_ASYNCMSG:
3707 ret = iscsit_send_conn_drop_async_message(
3708 cmd, conn);
3709 break;
3710 case ISTATE_SEND_NOPIN:
3711 ret = iscsit_send_nopin(cmd, conn);
3712 break;
3713 case ISTATE_SEND_REJECT:
3714 ret = iscsit_send_reject(cmd, conn);
3715 break;
3716 case ISTATE_SEND_TASKMGTRSP:
3717 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3718 if (ret != 0)
3719 break;
3720 ret = iscsit_tmr_post_handler(cmd, conn);
3721 if (ret != 0)
3722 iscsit_fall_back_to_erl0(conn->sess);
3723 break;
3724 case ISTATE_SEND_TEXTRSP:
3725 ret = iscsit_send_text_rsp(cmd, conn);
3726 break;
3727 default:
3728 pr_err("Unknown Opcode: 0x%02x ITT:"
3729 " 0x%08x, i_state: %d on CID: %hu\n",
3730 cmd->iscsi_opcode, cmd->init_task_tag,
3731 state, conn->cid);
3732 goto err;
3733 }
3734 if (ret < 0)
3735 goto err;
3736
3737 switch (state) {
3738 case ISTATE_SEND_LOGOUTRSP:
3739 if (!iscsit_logout_post_handler(cmd, conn))
3740 return -ECONNRESET;
3741 /* fall through */
3742 case ISTATE_SEND_STATUS:
3743 case ISTATE_SEND_ASYNCMSG:
3744 case ISTATE_SEND_NOPIN:
3745 case ISTATE_SEND_STATUS_RECOVERY:
3746 case ISTATE_SEND_TEXTRSP:
3747 case ISTATE_SEND_TASKMGTRSP:
3748 case ISTATE_SEND_REJECT:
3749 spin_lock_bh(&cmd->istate_lock);
3750 cmd->i_state = ISTATE_SENT_STATUS;
3751 spin_unlock_bh(&cmd->istate_lock);
3752 break;
3753 default:
3754 pr_err("Unknown Opcode: 0x%02x ITT:"
3755 " 0x%08x, i_state: %d on CID: %hu\n",
3756 cmd->iscsi_opcode, cmd->init_task_tag,
3757 cmd->i_state, conn->cid);
3758 goto err;
3759 }
3760
3761 if (atomic_read(&conn->check_immediate_queue))
3762 return 1;
3763
3764 return 0;
3765
3766 err:
3767 return -1;
3768 }
3769 EXPORT_SYMBOL(iscsit_response_queue);
3770
3771 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3772 {
3773 struct iscsit_transport *t = conn->conn_transport;
3774 struct iscsi_queue_req *qr;
3775 struct iscsi_cmd *cmd;
3776 u8 state;
3777 int ret;
3778
3779 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3780 cmd = qr->cmd;
3781 state = qr->state;
3782 kmem_cache_free(lio_qr_cache, qr);
3783
3784 ret = t->iscsit_response_queue(conn, cmd, state);
3785 if (ret == 1 || ret < 0)
3786 return ret;
3787 }
3788
3789 return 0;
3790 }
3791
3792 int iscsi_target_tx_thread(void *arg)
3793 {
3794 int ret = 0;
3795 struct iscsi_conn *conn = arg;
3796 bool conn_freed = false;
3797
3798 /*
3799 * Allow ourselves to be interrupted by SIGINT so that a
3800 * connection recovery / failure event can be triggered externally.
3801 */
3802 allow_signal(SIGINT);
3803
3804 while (!kthread_should_stop()) {
3805 /*
3806 * Ensure that both TX and RX per connection kthreads
3807 * are scheduled to run on the same CPU.
3808 */
3809 iscsit_thread_check_cpumask(conn, current, 1);
3810
3811 wait_event_interruptible(conn->queues_wq,
3812 !iscsit_conn_all_queues_empty(conn));
3813
3814 if (signal_pending(current))
3815 goto transport_err;
3816
3817 get_immediate:
3818 ret = iscsit_handle_immediate_queue(conn);
3819 if (ret < 0)
3820 goto transport_err;
3821
3822 ret = iscsit_handle_response_queue(conn);
3823 if (ret == 1) {
3824 goto get_immediate;
3825 } else if (ret == -ECONNRESET) {
3826 conn_freed = true;
3827 goto out;
3828 } else if (ret < 0) {
3829 goto transport_err;
3830 }
3831 }
3832
3833 transport_err:
3834 /*
3835 * Avoid the normal connection failure code-path if this connection
3836 * is still within LOGIN mode, and iscsi_np process context is
3837 * responsible for cleaning up the early connection failure.
3838 */
3839 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3840 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3841 out:
3842 if (!conn_freed) {
3843 while (!kthread_should_stop()) {
3844 msleep(100);
3845 }
3846 }
3847 return 0;
3848 }
3849
3850 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3851 {
3852 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3853 struct iscsi_cmd *cmd;
3854 int ret = 0;
3855
3856 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3857 case ISCSI_OP_SCSI_CMD:
3858 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3859 if (!cmd)
3860 goto reject;
3861
3862 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3863 break;
3864 case ISCSI_OP_SCSI_DATA_OUT:
3865 ret = iscsit_handle_data_out(conn, buf);
3866 break;
3867 case ISCSI_OP_NOOP_OUT:
3868 cmd = NULL;
3869 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3870 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3871 if (!cmd)
3872 goto reject;
3873 }
3874 ret = iscsit_handle_nop_out(conn, cmd, buf);
3875 break;
3876 case ISCSI_OP_SCSI_TMFUNC:
3877 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3878 if (!cmd)
3879 goto reject;
3880
3881 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3882 break;
3883 case ISCSI_OP_TEXT:
3884 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3885 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3886 if (!cmd)
3887 goto reject;
3888 } else {
3889 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3890 if (!cmd)
3891 goto reject;
3892 }
3893
3894 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3895 break;
3896 case ISCSI_OP_LOGOUT:
3897 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3898 if (!cmd)
3899 goto reject;
3900
3901 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3902 if (ret > 0)
3903 wait_for_completion_timeout(&conn->conn_logout_comp,
3904 SECONDS_FOR_LOGOUT_COMP * HZ);
3905 break;
3906 case ISCSI_OP_SNACK:
3907 ret = iscsit_handle_snack(conn, buf);
3908 break;
3909 default:
3910 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3911 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3912 pr_err("Cannot recover from unknown"
3913 " opcode while ERL=0, closing iSCSI connection.\n");
3914 return -1;
3915 }
3916 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3917 " closing iSCSI connection.\n");
3918 ret = -1;
3919 break;
3920 }
3921
3922 return ret;
3923 reject:
3924 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3925 }
3926
3927 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3928 {
3929 bool ret;
3930
3931 spin_lock_bh(&conn->state_lock);
3932 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3933 spin_unlock_bh(&conn->state_lock);
3934
3935 return ret;
3936 }
3937
3938 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3939 {
3940 int ret;
3941 u8 *buffer, opcode;
3942 u32 checksum = 0, digest = 0;
3943 struct kvec iov;
3944
3945 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3946 if (!buffer)
3947 return;
3948
3949 while (!kthread_should_stop()) {
3950 /*
3951 * Ensure that both TX and RX per connection kthreads
3952 * are scheduled to run on the same CPU.
3953 */
3954 iscsit_thread_check_cpumask(conn, current, 0);
3955
3956 memset(&iov, 0, sizeof(struct kvec));
3957
3958 iov.iov_base = buffer;
3959 iov.iov_len = ISCSI_HDR_LEN;
3960
3961 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3962 if (ret != ISCSI_HDR_LEN) {
3963 iscsit_rx_thread_wait_for_tcp(conn);
3964 break;
3965 }
3966
3967 if (conn->conn_ops->HeaderDigest) {
3968 iov.iov_base = &digest;
3969 iov.iov_len = ISCSI_CRC_LEN;
3970
3971 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3972 if (ret != ISCSI_CRC_LEN) {
3973 iscsit_rx_thread_wait_for_tcp(conn);
3974 break;
3975 }
3976
3977 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3978 ISCSI_HDR_LEN, 0, NULL,
3979 &checksum);
3980
3981 if (digest != checksum) {
3982 pr_err("HeaderDigest CRC32C failed,"
3983 " received 0x%08x, computed 0x%08x\n",
3984 digest, checksum);
3985 /*
3986 * Set the PDU to 0xff so it will intentionally
3987 * hit default in the switch below.
3988 */
3989 memset(buffer, 0xff, ISCSI_HDR_LEN);
3990 atomic_long_inc(&conn->sess->conn_digest_errors);
3991 } else {
3992 pr_debug("Got HeaderDigest CRC32C"
3993 " 0x%08x\n", checksum);
3994 }
3995 }
3996
3997 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3998 break;
3999
4000 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4001
4002 if (conn->sess->sess_ops->SessionType &&
4003 ((!(opcode & ISCSI_OP_TEXT)) ||
4004 (!(opcode & ISCSI_OP_LOGOUT)))) {
4005 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4006 " while in Discovery Session, rejecting.\n", opcode);
4007 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4008 buffer);
4009 break;
4010 }
4011
4012 ret = iscsi_target_rx_opcode(conn, buffer);
4013 if (ret < 0)
4014 break;
4015 }
4016
4017 kfree(buffer);
4018 }
4019
4020 int iscsi_target_rx_thread(void *arg)
4021 {
4022 int rc;
4023 struct iscsi_conn *conn = arg;
4024 bool conn_freed = false;
4025
4026 /*
4027 * Allow ourselves to be interrupted by SIGINT so that a
4028 * connection recovery / failure event can be triggered externally.
4029 */
4030 allow_signal(SIGINT);
4031 /*
4032 * Wait for iscsi_post_login_handler() to complete before allowing
4033 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4034 */
4035 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4036 if (rc < 0 || iscsi_target_check_conn_state(conn))
4037 goto out;
4038
4039 if (!conn->conn_transport->iscsit_get_rx_pdu)
4040 return 0;
4041
4042 conn->conn_transport->iscsit_get_rx_pdu(conn);
4043
4044 if (!signal_pending(current))
4045 atomic_set(&conn->transport_failed, 1);
4046 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4047
4048 out:
4049 if (!conn_freed) {
4050 while (!kthread_should_stop()) {
4051 msleep(100);
4052 }
4053 }
4054
4055 return 0;
4056 }
4057
4058 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4059 {
4060 LIST_HEAD(tmp_list);
4061 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4062 struct iscsi_session *sess = conn->sess;
4063 /*
4064 * We expect this function to only ever be called from either RX or TX
4065 * thread context via iscsit_close_connection() once the other context
4066 * has been reset -> returned sleeping pre-handler state.
4067 */
4068 spin_lock_bh(&conn->cmd_lock);
4069 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4070
4071 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4072 struct se_cmd *se_cmd = &cmd->se_cmd;
4073
4074 if (se_cmd->se_tfo != NULL) {
4075 spin_lock_irq(&se_cmd->t_state_lock);
4076 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4077 spin_unlock_irq(&se_cmd->t_state_lock);
4078 }
4079 }
4080 spin_unlock_bh(&conn->cmd_lock);
4081
4082 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4083 list_del_init(&cmd->i_conn_node);
4084
4085 iscsit_increment_maxcmdsn(cmd, sess);
4086 iscsit_free_cmd(cmd, true);
4087
4088 }
4089 }
4090
4091 static void iscsit_stop_timers_for_cmds(
4092 struct iscsi_conn *conn)
4093 {
4094 struct iscsi_cmd *cmd;
4095
4096 spin_lock_bh(&conn->cmd_lock);
4097 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4098 if (cmd->data_direction == DMA_TO_DEVICE)
4099 iscsit_stop_dataout_timer(cmd);
4100 }
4101 spin_unlock_bh(&conn->cmd_lock);
4102 }
4103
4104 int iscsit_close_connection(
4105 struct iscsi_conn *conn)
4106 {
4107 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4108 struct iscsi_session *sess = conn->sess;
4109
4110 pr_debug("Closing iSCSI connection CID %hu on SID:"
4111 " %u\n", conn->cid, sess->sid);
4112 /*
4113 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4114 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4115 * sleeping and the logout response never got sent because the
4116 * connection failed.
4117 *
4118 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4119 * to signal logout response TX interrupt completion. Go ahead and skip
4120 * this for iser since isert_rx_opcode() does not wait on logout failure,
4121 * and to avoid iscsi_conn pointer dereference in iser-target code.
4122 */
4123 if (!conn->conn_transport->rdma_shutdown)
4124 complete(&conn->conn_logout_comp);
4125
4126 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4127 if (conn->tx_thread &&
4128 cmpxchg(&conn->tx_thread_active, true, false)) {
4129 send_sig(SIGINT, conn->tx_thread, 1);
4130 kthread_stop(conn->tx_thread);
4131 }
4132 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4133 if (conn->rx_thread &&
4134 cmpxchg(&conn->rx_thread_active, true, false)) {
4135 send_sig(SIGINT, conn->rx_thread, 1);
4136 kthread_stop(conn->rx_thread);
4137 }
4138 }
4139
4140 spin_lock(&iscsit_global->ts_bitmap_lock);
4141 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4142 get_order(1));
4143 spin_unlock(&iscsit_global->ts_bitmap_lock);
4144
4145 iscsit_stop_timers_for_cmds(conn);
4146 iscsit_stop_nopin_response_timer(conn);
4147 iscsit_stop_nopin_timer(conn);
4148
4149 if (conn->conn_transport->iscsit_wait_conn)
4150 conn->conn_transport->iscsit_wait_conn(conn);
4151
4152 /*
4153 * During Connection recovery drop unacknowledged out of order
4154 * commands for this connection, and prepare the other commands
4155 * for reallegiance.
4156 *
4157 * During normal operation clear the out of order commands (but
4158 * do not free the struct iscsi_ooo_cmdsn's) and release all
4159 * struct iscsi_cmds.
4160 */
4161 if (atomic_read(&conn->connection_recovery)) {
4162 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4163 iscsit_prepare_cmds_for_reallegiance(conn);
4164 } else {
4165 iscsit_clear_ooo_cmdsns_for_conn(conn);
4166 iscsit_release_commands_from_conn(conn);
4167 }
4168 iscsit_free_queue_reqs_for_conn(conn);
4169
4170 /*
4171 * Handle decrementing session or connection usage count if
4172 * a logout response was not able to be sent because the
4173 * connection failed. Fall back to Session Recovery here.
4174 */
4175 if (atomic_read(&conn->conn_logout_remove)) {
4176 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4177 iscsit_dec_conn_usage_count(conn);
4178 iscsit_dec_session_usage_count(sess);
4179 }
4180 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4181 iscsit_dec_conn_usage_count(conn);
4182
4183 atomic_set(&conn->conn_logout_remove, 0);
4184 atomic_set(&sess->session_reinstatement, 0);
4185 atomic_set(&sess->session_fall_back_to_erl0, 1);
4186 }
4187
4188 spin_lock_bh(&sess->conn_lock);
4189 list_del(&conn->conn_list);
4190
4191 /*
4192 * Attempt to let the Initiator know this connection failed by
4193 * sending an Connection Dropped Async Message on another
4194 * active connection.
4195 */
4196 if (atomic_read(&conn->connection_recovery))
4197 iscsit_build_conn_drop_async_message(conn);
4198
4199 spin_unlock_bh(&sess->conn_lock);
4200
4201 /*
4202 * If connection reinstatement is being performed on this connection,
4203 * up the connection reinstatement semaphore that is being blocked on
4204 * in iscsit_cause_connection_reinstatement().
4205 */
4206 spin_lock_bh(&conn->state_lock);
4207 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4208 spin_unlock_bh(&conn->state_lock);
4209 complete(&conn->conn_wait_comp);
4210 wait_for_completion(&conn->conn_post_wait_comp);
4211 spin_lock_bh(&conn->state_lock);
4212 }
4213
4214 /*
4215 * If connection reinstatement is being performed on this connection
4216 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4217 * connection wait rcfr semaphore that is being blocked on
4218 * an iscsit_connection_reinstatement_rcfr().
4219 */
4220 if (atomic_read(&conn->connection_wait_rcfr)) {
4221 spin_unlock_bh(&conn->state_lock);
4222 complete(&conn->conn_wait_rcfr_comp);
4223 wait_for_completion(&conn->conn_post_wait_comp);
4224 spin_lock_bh(&conn->state_lock);
4225 }
4226 atomic_set(&conn->connection_reinstatement, 1);
4227 spin_unlock_bh(&conn->state_lock);
4228
4229 /*
4230 * If any other processes are accessing this connection pointer we
4231 * must wait until they have completed.
4232 */
4233 iscsit_check_conn_usage_count(conn);
4234
4235 ahash_request_free(conn->conn_tx_hash);
4236 if (conn->conn_rx_hash) {
4237 struct crypto_ahash *tfm;
4238
4239 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4240 ahash_request_free(conn->conn_rx_hash);
4241 crypto_free_ahash(tfm);
4242 }
4243
4244 if (conn->sock)
4245 sock_release(conn->sock);
4246
4247 if (conn->conn_transport->iscsit_free_conn)
4248 conn->conn_transport->iscsit_free_conn(conn);
4249
4250 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4251 conn->conn_state = TARG_CONN_STATE_FREE;
4252 iscsit_free_conn(conn);
4253
4254 spin_lock_bh(&sess->conn_lock);
4255 atomic_dec(&sess->nconn);
4256 pr_debug("Decremented iSCSI connection count to %hu from node:"
4257 " %s\n", atomic_read(&sess->nconn),
4258 sess->sess_ops->InitiatorName);
4259 /*
4260 * Make sure that if one connection fails in an non ERL=2 iSCSI
4261 * Session that they all fail.
4262 */
4263 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4264 !atomic_read(&sess->session_logout))
4265 atomic_set(&sess->session_fall_back_to_erl0, 1);
4266
4267 /*
4268 * If this was not the last connection in the session, and we are
4269 * performing session reinstatement or falling back to ERL=0, call
4270 * iscsit_stop_session() without sleeping to shutdown the other
4271 * active connections.
4272 */
4273 if (atomic_read(&sess->nconn)) {
4274 if (!atomic_read(&sess->session_reinstatement) &&
4275 !atomic_read(&sess->session_fall_back_to_erl0)) {
4276 spin_unlock_bh(&sess->conn_lock);
4277 return 0;
4278 }
4279 if (!atomic_read(&sess->session_stop_active)) {
4280 atomic_set(&sess->session_stop_active, 1);
4281 spin_unlock_bh(&sess->conn_lock);
4282 iscsit_stop_session(sess, 0, 0);
4283 return 0;
4284 }
4285 spin_unlock_bh(&sess->conn_lock);
4286 return 0;
4287 }
4288
4289 /*
4290 * If this was the last connection in the session and one of the
4291 * following is occurring:
4292 *
4293 * Session Reinstatement is not being performed, and are falling back
4294 * to ERL=0 call iscsit_close_session().
4295 *
4296 * Session Logout was requested. iscsit_close_session() will be called
4297 * elsewhere.
4298 *
4299 * Session Continuation is not being performed, start the Time2Retain
4300 * handler and check if sleep_on_sess_wait_sem is active.
4301 */
4302 if (!atomic_read(&sess->session_reinstatement) &&
4303 atomic_read(&sess->session_fall_back_to_erl0)) {
4304 spin_unlock_bh(&sess->conn_lock);
4305 iscsit_close_session(sess);
4306
4307 return 0;
4308 } else if (atomic_read(&sess->session_logout)) {
4309 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4310 sess->session_state = TARG_SESS_STATE_FREE;
4311 spin_unlock_bh(&sess->conn_lock);
4312
4313 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4314 complete(&sess->session_wait_comp);
4315
4316 return 0;
4317 } else {
4318 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4319 sess->session_state = TARG_SESS_STATE_FAILED;
4320
4321 if (!atomic_read(&sess->session_continuation)) {
4322 spin_unlock_bh(&sess->conn_lock);
4323 iscsit_start_time2retain_handler(sess);
4324 } else
4325 spin_unlock_bh(&sess->conn_lock);
4326
4327 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4328 complete(&sess->session_wait_comp);
4329
4330 return 0;
4331 }
4332 }
4333
4334 /*
4335 * If the iSCSI Session for the iSCSI Initiator Node exists,
4336 * forcefully shutdown the iSCSI NEXUS.
4337 */
4338 int iscsit_close_session(struct iscsi_session *sess)
4339 {
4340 struct iscsi_portal_group *tpg = sess->tpg;
4341 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4342
4343 if (atomic_read(&sess->nconn)) {
4344 pr_err("%d connection(s) still exist for iSCSI session"
4345 " to %s\n", atomic_read(&sess->nconn),
4346 sess->sess_ops->InitiatorName);
4347 BUG();
4348 }
4349
4350 spin_lock_bh(&se_tpg->session_lock);
4351 atomic_set(&sess->session_logout, 1);
4352 atomic_set(&sess->session_reinstatement, 1);
4353 iscsit_stop_time2retain_timer(sess);
4354 spin_unlock_bh(&se_tpg->session_lock);
4355
4356 /*
4357 * transport_deregister_session_configfs() will clear the
4358 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4359 * can be setting it again with __transport_register_session() in
4360 * iscsi_post_login_handler() again after the iscsit_stop_session()
4361 * completes in iscsi_np context.
4362 */
4363 transport_deregister_session_configfs(sess->se_sess);
4364
4365 /*
4366 * If any other processes are accessing this session pointer we must
4367 * wait until they have completed. If we are in an interrupt (the
4368 * time2retain handler) and contain and active session usage count we
4369 * restart the timer and exit.
4370 */
4371 if (!in_interrupt()) {
4372 if (iscsit_check_session_usage_count(sess) == 1)
4373 iscsit_stop_session(sess, 1, 1);
4374 } else {
4375 if (iscsit_check_session_usage_count(sess) == 2) {
4376 atomic_set(&sess->session_logout, 0);
4377 iscsit_start_time2retain_handler(sess);
4378 return 0;
4379 }
4380 }
4381
4382 transport_deregister_session(sess->se_sess);
4383
4384 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4385 iscsit_free_connection_recovery_entires(sess);
4386
4387 iscsit_free_all_ooo_cmdsns(sess);
4388
4389 spin_lock_bh(&se_tpg->session_lock);
4390 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4391 sess->session_state = TARG_SESS_STATE_FREE;
4392 pr_debug("Released iSCSI session from node: %s\n",
4393 sess->sess_ops->InitiatorName);
4394 tpg->nsessions--;
4395 if (tpg->tpg_tiqn)
4396 tpg->tpg_tiqn->tiqn_nsessions--;
4397
4398 pr_debug("Decremented number of active iSCSI Sessions on"
4399 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4400
4401 spin_lock(&sess_idr_lock);
4402 idr_remove(&sess_idr, sess->session_index);
4403 spin_unlock(&sess_idr_lock);
4404
4405 kfree(sess->sess_ops);
4406 sess->sess_ops = NULL;
4407 spin_unlock_bh(&se_tpg->session_lock);
4408
4409 kfree(sess);
4410 return 0;
4411 }
4412
4413 static void iscsit_logout_post_handler_closesession(
4414 struct iscsi_conn *conn)
4415 {
4416 struct iscsi_session *sess = conn->sess;
4417 int sleep = 1;
4418 /*
4419 * Traditional iscsi/tcp will invoke this logic from TX thread
4420 * context during session logout, so clear tx_thread_active and
4421 * sleep if iscsit_close_connection() has not already occured.
4422 *
4423 * Since iser-target invokes this logic from it's own workqueue,
4424 * always sleep waiting for RX/TX thread shutdown to complete
4425 * within iscsit_close_connection().
4426 */
4427 if (!conn->conn_transport->rdma_shutdown) {
4428 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4429 if (!sleep)
4430 return;
4431 }
4432
4433 atomic_set(&conn->conn_logout_remove, 0);
4434 complete(&conn->conn_logout_comp);
4435
4436 iscsit_dec_conn_usage_count(conn);
4437 iscsit_stop_session(sess, sleep, sleep);
4438 iscsit_dec_session_usage_count(sess);
4439 iscsit_close_session(sess);
4440 }
4441
4442 static void iscsit_logout_post_handler_samecid(
4443 struct iscsi_conn *conn)
4444 {
4445 int sleep = 1;
4446
4447 if (!conn->conn_transport->rdma_shutdown) {
4448 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4449 if (!sleep)
4450 return;
4451 }
4452
4453 atomic_set(&conn->conn_logout_remove, 0);
4454 complete(&conn->conn_logout_comp);
4455
4456 iscsit_cause_connection_reinstatement(conn, sleep);
4457 iscsit_dec_conn_usage_count(conn);
4458 }
4459
4460 static void iscsit_logout_post_handler_diffcid(
4461 struct iscsi_conn *conn,
4462 u16 cid)
4463 {
4464 struct iscsi_conn *l_conn;
4465 struct iscsi_session *sess = conn->sess;
4466 bool conn_found = false;
4467
4468 if (!sess)
4469 return;
4470
4471 spin_lock_bh(&sess->conn_lock);
4472 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4473 if (l_conn->cid == cid) {
4474 iscsit_inc_conn_usage_count(l_conn);
4475 conn_found = true;
4476 break;
4477 }
4478 }
4479 spin_unlock_bh(&sess->conn_lock);
4480
4481 if (!conn_found)
4482 return;
4483
4484 if (l_conn->sock)
4485 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4486
4487 spin_lock_bh(&l_conn->state_lock);
4488 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4489 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4490 spin_unlock_bh(&l_conn->state_lock);
4491
4492 iscsit_cause_connection_reinstatement(l_conn, 1);
4493 iscsit_dec_conn_usage_count(l_conn);
4494 }
4495
4496 /*
4497 * Return of 0 causes the TX thread to restart.
4498 */
4499 int iscsit_logout_post_handler(
4500 struct iscsi_cmd *cmd,
4501 struct iscsi_conn *conn)
4502 {
4503 int ret = 0;
4504
4505 switch (cmd->logout_reason) {
4506 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4507 switch (cmd->logout_response) {
4508 case ISCSI_LOGOUT_SUCCESS:
4509 case ISCSI_LOGOUT_CLEANUP_FAILED:
4510 default:
4511 iscsit_logout_post_handler_closesession(conn);
4512 break;
4513 }
4514 ret = 0;
4515 break;
4516 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4517 if (conn->cid == cmd->logout_cid) {
4518 switch (cmd->logout_response) {
4519 case ISCSI_LOGOUT_SUCCESS:
4520 case ISCSI_LOGOUT_CLEANUP_FAILED:
4521 default:
4522 iscsit_logout_post_handler_samecid(conn);
4523 break;
4524 }
4525 ret = 0;
4526 } else {
4527 switch (cmd->logout_response) {
4528 case ISCSI_LOGOUT_SUCCESS:
4529 iscsit_logout_post_handler_diffcid(conn,
4530 cmd->logout_cid);
4531 break;
4532 case ISCSI_LOGOUT_CID_NOT_FOUND:
4533 case ISCSI_LOGOUT_CLEANUP_FAILED:
4534 default:
4535 break;
4536 }
4537 ret = 1;
4538 }
4539 break;
4540 case ISCSI_LOGOUT_REASON_RECOVERY:
4541 switch (cmd->logout_response) {
4542 case ISCSI_LOGOUT_SUCCESS:
4543 case ISCSI_LOGOUT_CID_NOT_FOUND:
4544 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4545 case ISCSI_LOGOUT_CLEANUP_FAILED:
4546 default:
4547 break;
4548 }
4549 ret = 1;
4550 break;
4551 default:
4552 break;
4553
4554 }
4555 return ret;
4556 }
4557 EXPORT_SYMBOL(iscsit_logout_post_handler);
4558
4559 void iscsit_fail_session(struct iscsi_session *sess)
4560 {
4561 struct iscsi_conn *conn;
4562
4563 spin_lock_bh(&sess->conn_lock);
4564 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4565 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4566 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4567 }
4568 spin_unlock_bh(&sess->conn_lock);
4569
4570 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4571 sess->session_state = TARG_SESS_STATE_FAILED;
4572 }
4573
4574 int iscsit_free_session(struct iscsi_session *sess)
4575 {
4576 u16 conn_count = atomic_read(&sess->nconn);
4577 struct iscsi_conn *conn, *conn_tmp = NULL;
4578 int is_last;
4579
4580 spin_lock_bh(&sess->conn_lock);
4581 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4582
4583 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4584 conn_list) {
4585 if (conn_count == 0)
4586 break;
4587
4588 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4589 is_last = 1;
4590 } else {
4591 iscsit_inc_conn_usage_count(conn_tmp);
4592 is_last = 0;
4593 }
4594 iscsit_inc_conn_usage_count(conn);
4595
4596 spin_unlock_bh(&sess->conn_lock);
4597 iscsit_cause_connection_reinstatement(conn, 1);
4598 spin_lock_bh(&sess->conn_lock);
4599
4600 iscsit_dec_conn_usage_count(conn);
4601 if (is_last == 0)
4602 iscsit_dec_conn_usage_count(conn_tmp);
4603
4604 conn_count--;
4605 }
4606
4607 if (atomic_read(&sess->nconn)) {
4608 spin_unlock_bh(&sess->conn_lock);
4609 wait_for_completion(&sess->session_wait_comp);
4610 } else
4611 spin_unlock_bh(&sess->conn_lock);
4612
4613 iscsit_close_session(sess);
4614 return 0;
4615 }
4616
4617 void iscsit_stop_session(
4618 struct iscsi_session *sess,
4619 int session_sleep,
4620 int connection_sleep)
4621 {
4622 u16 conn_count = atomic_read(&sess->nconn);
4623 struct iscsi_conn *conn, *conn_tmp = NULL;
4624 int is_last;
4625
4626 spin_lock_bh(&sess->conn_lock);
4627 if (session_sleep)
4628 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4629
4630 if (connection_sleep) {
4631 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4632 conn_list) {
4633 if (conn_count == 0)
4634 break;
4635
4636 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4637 is_last = 1;
4638 } else {
4639 iscsit_inc_conn_usage_count(conn_tmp);
4640 is_last = 0;
4641 }
4642 iscsit_inc_conn_usage_count(conn);
4643
4644 spin_unlock_bh(&sess->conn_lock);
4645 iscsit_cause_connection_reinstatement(conn, 1);
4646 spin_lock_bh(&sess->conn_lock);
4647
4648 iscsit_dec_conn_usage_count(conn);
4649 if (is_last == 0)
4650 iscsit_dec_conn_usage_count(conn_tmp);
4651 conn_count--;
4652 }
4653 } else {
4654 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4655 iscsit_cause_connection_reinstatement(conn, 0);
4656 }
4657
4658 if (session_sleep && atomic_read(&sess->nconn)) {
4659 spin_unlock_bh(&sess->conn_lock);
4660 wait_for_completion(&sess->session_wait_comp);
4661 } else
4662 spin_unlock_bh(&sess->conn_lock);
4663 }
4664
4665 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4666 {
4667 struct iscsi_session *sess;
4668 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4669 struct se_session *se_sess, *se_sess_tmp;
4670 LIST_HEAD(free_list);
4671 int session_count = 0;
4672
4673 spin_lock_bh(&se_tpg->session_lock);
4674 if (tpg->nsessions && !force) {
4675 spin_unlock_bh(&se_tpg->session_lock);
4676 return -1;
4677 }
4678
4679 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4680 sess_list) {
4681 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4682
4683 spin_lock(&sess->conn_lock);
4684 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4685 atomic_read(&sess->session_logout) ||
4686 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4687 spin_unlock(&sess->conn_lock);
4688 continue;
4689 }
4690 atomic_set(&sess->session_reinstatement, 1);
4691 atomic_set(&sess->session_fall_back_to_erl0, 1);
4692 spin_unlock(&sess->conn_lock);
4693
4694 list_move_tail(&se_sess->sess_list, &free_list);
4695 }
4696 spin_unlock_bh(&se_tpg->session_lock);
4697
4698 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4699 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4700
4701 iscsit_free_session(sess);
4702 session_count++;
4703 }
4704
4705 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4706 " Group: %hu\n", session_count, tpg->tpgt);
4707 return 0;
4708 }
4709
4710 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4711 MODULE_VERSION("4.1.x");
4712 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4713 MODULE_LICENSE("GPL");
4714
4715 module_init(iscsi_target_init_module);
4716 module_exit(iscsi_target_cleanup_module);
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