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target/iscsi: Allocate session IDs from an IDA
[linux/fpc-iii.git] / drivers / target / iscsi / iscsi_target.c
blob94bad43c41ffc2c7c33c1d3b48b0f0773fd87aa6
1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19 #include <crypto/hash.h>
20 #include <linux/string.h>
21 #include <linux/kthread.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
25 #include <linux/idr.h>
26 #include <linux/delay.h>
27 #include <linux/sched/signal.h>
28 #include <asm/unaligned.h>
29 #include <linux/inet.h>
30 #include <net/ipv6.h>
31 #include <scsi/scsi_proto.h>
32 #include <scsi/iscsi_proto.h>
33 #include <scsi/scsi_tcq.h>
34 #include <target/target_core_base.h>
35 #include <target/target_core_fabric.h>
36
37 #include <target/iscsi/iscsi_target_core.h>
38 #include "iscsi_target_parameters.h"
39 #include "iscsi_target_seq_pdu_list.h"
40 #include "iscsi_target_datain_values.h"
41 #include "iscsi_target_erl0.h"
42 #include "iscsi_target_erl1.h"
43 #include "iscsi_target_erl2.h"
44 #include "iscsi_target_login.h"
45 #include "iscsi_target_tmr.h"
46 #include "iscsi_target_tpg.h"
47 #include "iscsi_target_util.h"
48 #include "iscsi_target.h"
49 #include "iscsi_target_device.h"
50 #include <target/iscsi/iscsi_target_stat.h>
51
52 #include <target/iscsi/iscsi_transport.h>
53
54 static LIST_HEAD(g_tiqn_list);
55 static LIST_HEAD(g_np_list);
56 static DEFINE_SPINLOCK(tiqn_lock);
57 static DEFINE_MUTEX(np_lock);
58
59 static struct idr tiqn_idr;
60 DEFINE_IDA(sess_ida);
61 struct mutex auth_id_lock;
62
63 struct iscsit_global *iscsit_global;
64
65 struct kmem_cache *lio_qr_cache;
66 struct kmem_cache *lio_dr_cache;
67 struct kmem_cache *lio_ooo_cache;
68 struct kmem_cache *lio_r2t_cache;
69
70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
71 struct iscsi_scsi_req *, u32);
72
73 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
74 {
75 struct iscsi_tiqn *tiqn = NULL;
76
77 spin_lock(&tiqn_lock);
78 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
79 if (!strcmp(tiqn->tiqn, buf)) {
80
81 spin_lock(&tiqn->tiqn_state_lock);
82 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
83 tiqn->tiqn_access_count++;
84 spin_unlock(&tiqn->tiqn_state_lock);
85 spin_unlock(&tiqn_lock);
86 return tiqn;
87 }
88 spin_unlock(&tiqn->tiqn_state_lock);
89 }
90 }
91 spin_unlock(&tiqn_lock);
92
93 return NULL;
94 }
95
96 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
97 {
98 spin_lock(&tiqn->tiqn_state_lock);
99 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
100 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
101 spin_unlock(&tiqn->tiqn_state_lock);
102 return 0;
103 }
104 spin_unlock(&tiqn->tiqn_state_lock);
105
106 return -1;
107 }
108
109 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
110 {
111 spin_lock(&tiqn->tiqn_state_lock);
112 tiqn->tiqn_access_count--;
113 spin_unlock(&tiqn->tiqn_state_lock);
114 }
115
116 /*
117 * Note that IQN formatting is expected to be done in userspace, and
118 * no explict IQN format checks are done here.
119 */
120 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
121 {
122 struct iscsi_tiqn *tiqn = NULL;
123 int ret;
124
125 if (strlen(buf) >= ISCSI_IQN_LEN) {
126 pr_err("Target IQN exceeds %d bytes\n",
127 ISCSI_IQN_LEN);
128 return ERR_PTR(-EINVAL);
129 }
130
131 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
132 if (!tiqn)
133 return ERR_PTR(-ENOMEM);
134
135 sprintf(tiqn->tiqn, "%s", buf);
136 INIT_LIST_HEAD(&tiqn->tiqn_list);
137 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
138 spin_lock_init(&tiqn->tiqn_state_lock);
139 spin_lock_init(&tiqn->tiqn_tpg_lock);
140 spin_lock_init(&tiqn->sess_err_stats.lock);
141 spin_lock_init(&tiqn->login_stats.lock);
142 spin_lock_init(&tiqn->logout_stats.lock);
143
144 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
145
146 idr_preload(GFP_KERNEL);
147 spin_lock(&tiqn_lock);
148
149 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
150 if (ret < 0) {
151 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
152 spin_unlock(&tiqn_lock);
153 idr_preload_end();
154 kfree(tiqn);
155 return ERR_PTR(ret);
156 }
157 tiqn->tiqn_index = ret;
158 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
159
160 spin_unlock(&tiqn_lock);
161 idr_preload_end();
162
163 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
164
165 return tiqn;
166
167 }
168
169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
170 {
171 /*
172 * Wait for accesses to said struct iscsi_tiqn to end.
173 */
174 spin_lock(&tiqn->tiqn_state_lock);
175 while (tiqn->tiqn_access_count != 0) {
176 spin_unlock(&tiqn->tiqn_state_lock);
177 msleep(10);
178 spin_lock(&tiqn->tiqn_state_lock);
179 }
180 spin_unlock(&tiqn->tiqn_state_lock);
181 }
182
183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
184 {
185 /*
186 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
187 * while holding tiqn->tiqn_state_lock. This means that all subsequent
188 * attempts to access this struct iscsi_tiqn will fail from both transport
189 * fabric and control code paths.
190 */
191 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
192 pr_err("iscsit_set_tiqn_shutdown() failed\n");
193 return;
194 }
195
196 iscsit_wait_for_tiqn(tiqn);
197
198 spin_lock(&tiqn_lock);
199 list_del(&tiqn->tiqn_list);
200 idr_remove(&tiqn_idr, tiqn->tiqn_index);
201 spin_unlock(&tiqn_lock);
202
203 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
204 tiqn->tiqn);
205 kfree(tiqn);
206 }
207
208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
209 {
210 int ret;
211 /*
212 * Determine if the network portal is accepting storage traffic.
213 */
214 spin_lock_bh(&np->np_thread_lock);
215 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
216 spin_unlock_bh(&np->np_thread_lock);
217 return -1;
218 }
219 spin_unlock_bh(&np->np_thread_lock);
220 /*
221 * Determine if the portal group is accepting storage traffic.
222 */
223 spin_lock_bh(&tpg->tpg_state_lock);
224 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
225 spin_unlock_bh(&tpg->tpg_state_lock);
226 return -1;
227 }
228 spin_unlock_bh(&tpg->tpg_state_lock);
229
230 /*
231 * Here we serialize access across the TIQN+TPG Tuple.
232 */
233 ret = down_interruptible(&tpg->np_login_sem);
234 if (ret != 0)
235 return -1;
236
237 spin_lock_bh(&tpg->tpg_state_lock);
238 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
239 spin_unlock_bh(&tpg->tpg_state_lock);
240 up(&tpg->np_login_sem);
241 return -1;
242 }
243 spin_unlock_bh(&tpg->tpg_state_lock);
244
245 return 0;
246 }
247
248 void iscsit_login_kref_put(struct kref *kref)
249 {
250 struct iscsi_tpg_np *tpg_np = container_of(kref,
251 struct iscsi_tpg_np, tpg_np_kref);
252
253 complete(&tpg_np->tpg_np_comp);
254 }
255
256 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
257 struct iscsi_tpg_np *tpg_np)
258 {
259 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
260
261 up(&tpg->np_login_sem);
262
263 if (tpg_np)
264 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
265
266 if (tiqn)
267 iscsit_put_tiqn_for_login(tiqn);
268
269 return 0;
270 }
271
272 bool iscsit_check_np_match(
273 struct sockaddr_storage *sockaddr,
274 struct iscsi_np *np,
275 int network_transport)
276 {
277 struct sockaddr_in *sock_in, *sock_in_e;
278 struct sockaddr_in6 *sock_in6, *sock_in6_e;
279 bool ip_match = false;
280 u16 port, port_e;
281
282 if (sockaddr->ss_family == AF_INET6) {
283 sock_in6 = (struct sockaddr_in6 *)sockaddr;
284 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
285
286 if (!memcmp(&sock_in6->sin6_addr.in6_u,
287 &sock_in6_e->sin6_addr.in6_u,
288 sizeof(struct in6_addr)))
289 ip_match = true;
290
291 port = ntohs(sock_in6->sin6_port);
292 port_e = ntohs(sock_in6_e->sin6_port);
293 } else {
294 sock_in = (struct sockaddr_in *)sockaddr;
295 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
296
297 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
298 ip_match = true;
299
300 port = ntohs(sock_in->sin_port);
301 port_e = ntohs(sock_in_e->sin_port);
302 }
303
304 if (ip_match && (port_e == port) &&
305 (np->np_network_transport == network_transport))
306 return true;
307
308 return false;
309 }
310
311 /*
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 idr_init(&tiqn_idr);
703
704 ret = target_register_template(&iscsi_ops);
705 if (ret)
706 goto out;
707
708 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
709 iscsit_global->ts_bitmap = vzalloc(size);
710 if (!iscsit_global->ts_bitmap)
711 goto configfs_out;
712
713 lio_qr_cache = kmem_cache_create("lio_qr_cache",
714 sizeof(struct iscsi_queue_req),
715 __alignof__(struct iscsi_queue_req), 0, NULL);
716 if (!lio_qr_cache) {
717 pr_err("nable to kmem_cache_create() for"
718 " lio_qr_cache\n");
719 goto bitmap_out;
720 }
721
722 lio_dr_cache = kmem_cache_create("lio_dr_cache",
723 sizeof(struct iscsi_datain_req),
724 __alignof__(struct iscsi_datain_req), 0, NULL);
725 if (!lio_dr_cache) {
726 pr_err("Unable to kmem_cache_create() for"
727 " lio_dr_cache\n");
728 goto qr_out;
729 }
730
731 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
732 sizeof(struct iscsi_ooo_cmdsn),
733 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
734 if (!lio_ooo_cache) {
735 pr_err("Unable to kmem_cache_create() for"
736 " lio_ooo_cache\n");
737 goto dr_out;
738 }
739
740 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
741 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
742 0, NULL);
743 if (!lio_r2t_cache) {
744 pr_err("Unable to kmem_cache_create() for"
745 " lio_r2t_cache\n");
746 goto ooo_out;
747 }
748
749 iscsit_register_transport(&iscsi_target_transport);
750
751 if (iscsit_load_discovery_tpg() < 0)
752 goto r2t_out;
753
754 return ret;
755 r2t_out:
756 iscsit_unregister_transport(&iscsi_target_transport);
757 kmem_cache_destroy(lio_r2t_cache);
758 ooo_out:
759 kmem_cache_destroy(lio_ooo_cache);
760 dr_out:
761 kmem_cache_destroy(lio_dr_cache);
762 qr_out:
763 kmem_cache_destroy(lio_qr_cache);
764 bitmap_out:
765 vfree(iscsit_global->ts_bitmap);
766 configfs_out:
767 /* XXX: this probably wants it to be it's own unwind step.. */
768 if (iscsit_global->discovery_tpg)
769 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
770 target_unregister_template(&iscsi_ops);
771 out:
772 kfree(iscsit_global);
773 return -ENOMEM;
774 }
775
776 static void __exit iscsi_target_cleanup_module(void)
777 {
778 iscsit_release_discovery_tpg();
779 iscsit_unregister_transport(&iscsi_target_transport);
780 kmem_cache_destroy(lio_qr_cache);
781 kmem_cache_destroy(lio_dr_cache);
782 kmem_cache_destroy(lio_ooo_cache);
783 kmem_cache_destroy(lio_r2t_cache);
784
785 /*
786 * Shutdown discovery sessions and disable discovery TPG
787 */
788 if (iscsit_global->discovery_tpg)
789 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
790
791 target_unregister_template(&iscsi_ops);
792
793 vfree(iscsit_global->ts_bitmap);
794 kfree(iscsit_global);
795 }
796
797 int iscsit_add_reject(
798 struct iscsi_conn *conn,
799 u8 reason,
800 unsigned char *buf)
801 {
802 struct iscsi_cmd *cmd;
803
804 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
805 if (!cmd)
806 return -1;
807
808 cmd->iscsi_opcode = ISCSI_OP_REJECT;
809 cmd->reject_reason = reason;
810
811 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
812 if (!cmd->buf_ptr) {
813 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
814 iscsit_free_cmd(cmd, false);
815 return -1;
816 }
817
818 spin_lock_bh(&conn->cmd_lock);
819 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
820 spin_unlock_bh(&conn->cmd_lock);
821
822 cmd->i_state = ISTATE_SEND_REJECT;
823 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
824
825 return -1;
826 }
827 EXPORT_SYMBOL(iscsit_add_reject);
828
829 static int iscsit_add_reject_from_cmd(
830 struct iscsi_cmd *cmd,
831 u8 reason,
832 bool add_to_conn,
833 unsigned char *buf)
834 {
835 struct iscsi_conn *conn;
836 const bool do_put = cmd->se_cmd.se_tfo != NULL;
837
838 if (!cmd->conn) {
839 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
840 cmd->init_task_tag);
841 return -1;
842 }
843 conn = cmd->conn;
844
845 cmd->iscsi_opcode = ISCSI_OP_REJECT;
846 cmd->reject_reason = reason;
847
848 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
849 if (!cmd->buf_ptr) {
850 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
851 iscsit_free_cmd(cmd, false);
852 return -1;
853 }
854
855 if (add_to_conn) {
856 spin_lock_bh(&conn->cmd_lock);
857 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
858 spin_unlock_bh(&conn->cmd_lock);
859 }
860
861 cmd->i_state = ISTATE_SEND_REJECT;
862 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
863 /*
864 * Perform the kref_put now if se_cmd has already been setup by
865 * scsit_setup_scsi_cmd()
866 */
867 if (do_put) {
868 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
869 target_put_sess_cmd(&cmd->se_cmd);
870 }
871 return -1;
872 }
873
874 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
875 unsigned char *buf)
876 {
877 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
878 }
879
880 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
881 {
882 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
883 }
884 EXPORT_SYMBOL(iscsit_reject_cmd);
885
886 /*
887 * Map some portion of the allocated scatterlist to an iovec, suitable for
888 * kernel sockets to copy data in/out.
889 */
890 static int iscsit_map_iovec(
891 struct iscsi_cmd *cmd,
892 struct kvec *iov,
893 u32 data_offset,
894 u32 data_length)
895 {
896 u32 i = 0;
897 struct scatterlist *sg;
898 unsigned int page_off;
899
900 /*
901 * We know each entry in t_data_sg contains a page.
902 */
903 u32 ent = data_offset / PAGE_SIZE;
904
905 if (ent >= cmd->se_cmd.t_data_nents) {
906 pr_err("Initial page entry out-of-bounds\n");
907 return -1;
908 }
909
910 sg = &cmd->se_cmd.t_data_sg[ent];
911 page_off = (data_offset % PAGE_SIZE);
912
913 cmd->first_data_sg = sg;
914 cmd->first_data_sg_off = page_off;
915
916 while (data_length) {
917 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
918
919 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
920 iov[i].iov_len = cur_len;
921
922 data_length -= cur_len;
923 page_off = 0;
924 sg = sg_next(sg);
925 i++;
926 }
927
928 cmd->kmapped_nents = i;
929
930 return i;
931 }
932
933 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
934 {
935 u32 i;
936 struct scatterlist *sg;
937
938 sg = cmd->first_data_sg;
939
940 for (i = 0; i < cmd->kmapped_nents; i++)
941 kunmap(sg_page(&sg[i]));
942 }
943
944 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
945 {
946 LIST_HEAD(ack_list);
947 struct iscsi_cmd *cmd, *cmd_p;
948
949 conn->exp_statsn = exp_statsn;
950
951 if (conn->sess->sess_ops->RDMAExtensions)
952 return;
953
954 spin_lock_bh(&conn->cmd_lock);
955 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
956 spin_lock(&cmd->istate_lock);
957 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
958 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
959 cmd->i_state = ISTATE_REMOVE;
960 spin_unlock(&cmd->istate_lock);
961 list_move_tail(&cmd->i_conn_node, &ack_list);
962 continue;
963 }
964 spin_unlock(&cmd->istate_lock);
965 }
966 spin_unlock_bh(&conn->cmd_lock);
967
968 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
969 list_del_init(&cmd->i_conn_node);
970 iscsit_free_cmd(cmd, false);
971 }
972 }
973
974 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
975 {
976 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
977
978 iov_count += ISCSI_IOV_DATA_BUFFER;
979 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
980 if (!cmd->iov_data)
981 return -ENOMEM;
982
983 cmd->orig_iov_data_count = iov_count;
984 return 0;
985 }
986
987 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
988 unsigned char *buf)
989 {
990 int data_direction, payload_length;
991 struct iscsi_scsi_req *hdr;
992 int iscsi_task_attr;
993 int sam_task_attr;
994
995 atomic_long_inc(&conn->sess->cmd_pdus);
996
997 hdr = (struct iscsi_scsi_req *) buf;
998 payload_length = ntoh24(hdr->dlength);
999
1000 /* FIXME; Add checks for AdditionalHeaderSegment */
1001
1002 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1003 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1004 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1005 " not set. Bad iSCSI Initiator.\n");
1006 return iscsit_add_reject_cmd(cmd,
1007 ISCSI_REASON_BOOKMARK_INVALID, buf);
1008 }
1009
1010 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1011 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1012 /*
1013 * From RFC-3720 Section 10.3.1:
1014 *
1015 * "Either or both of R and W MAY be 1 when either the
1016 * Expected Data Transfer Length and/or Bidirectional Read
1017 * Expected Data Transfer Length are 0"
1018 *
1019 * For this case, go ahead and clear the unnecssary bits
1020 * to avoid any confusion with ->data_direction.
1021 */
1022 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1023 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1024
1025 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1026 " set when Expected Data Transfer Length is 0 for"
1027 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1028 }
1029
1030 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1031 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1032 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1033 " MUST be set if Expected Data Transfer Length is not 0."
1034 " Bad iSCSI Initiator\n");
1035 return iscsit_add_reject_cmd(cmd,
1036 ISCSI_REASON_BOOKMARK_INVALID, buf);
1037 }
1038
1039 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1040 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1041 pr_err("Bidirectional operations not supported!\n");
1042 return iscsit_add_reject_cmd(cmd,
1043 ISCSI_REASON_BOOKMARK_INVALID, buf);
1044 }
1045
1046 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1047 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1048 " Scsi Command PDU.\n");
1049 return iscsit_add_reject_cmd(cmd,
1050 ISCSI_REASON_BOOKMARK_INVALID, buf);
1051 }
1052
1053 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1054 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1055 " protocol error.\n", payload_length);
1056 return iscsit_add_reject_cmd(cmd,
1057 ISCSI_REASON_PROTOCOL_ERROR, buf);
1058 }
1059
1060 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1061 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1062 pr_err("Expected Data Transfer Length and Length of"
1063 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1064 " bit is not set protocol error\n");
1065 return iscsit_add_reject_cmd(cmd,
1066 ISCSI_REASON_PROTOCOL_ERROR, buf);
1067 }
1068
1069 if (payload_length > be32_to_cpu(hdr->data_length)) {
1070 pr_err("DataSegmentLength: %u is greater than"
1071 " EDTL: %u, protocol error.\n", payload_length,
1072 hdr->data_length);
1073 return iscsit_add_reject_cmd(cmd,
1074 ISCSI_REASON_PROTOCOL_ERROR, buf);
1075 }
1076
1077 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1078 pr_err("DataSegmentLength: %u is greater than"
1079 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1080 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1081 return iscsit_add_reject_cmd(cmd,
1082 ISCSI_REASON_PROTOCOL_ERROR, buf);
1083 }
1084
1085 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1086 pr_err("DataSegmentLength: %u is greater than"
1087 " FirstBurstLength: %u, protocol error.\n",
1088 payload_length, conn->sess->sess_ops->FirstBurstLength);
1089 return iscsit_add_reject_cmd(cmd,
1090 ISCSI_REASON_BOOKMARK_INVALID, buf);
1091 }
1092
1093 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1094 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1095 DMA_NONE;
1096
1097 cmd->data_direction = data_direction;
1098 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1099 /*
1100 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1101 */
1102 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1103 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1104 sam_task_attr = TCM_SIMPLE_TAG;
1105 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1106 sam_task_attr = TCM_ORDERED_TAG;
1107 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1108 sam_task_attr = TCM_HEAD_TAG;
1109 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1110 sam_task_attr = TCM_ACA_TAG;
1111 else {
1112 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1113 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1114 sam_task_attr = TCM_SIMPLE_TAG;
1115 }
1116
1117 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1118 cmd->i_state = ISTATE_NEW_CMD;
1119 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1120 cmd->immediate_data = (payload_length) ? 1 : 0;
1121 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1122 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1123 if (cmd->unsolicited_data)
1124 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1125
1126 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1127 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1128 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1129 else
1130 cmd->targ_xfer_tag = 0xFFFFFFFF;
1131 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1132 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1133 cmd->first_burst_len = payload_length;
1134
1135 if (!conn->sess->sess_ops->RDMAExtensions &&
1136 cmd->data_direction == DMA_FROM_DEVICE) {
1137 struct iscsi_datain_req *dr;
1138
1139 dr = iscsit_allocate_datain_req();
1140 if (!dr)
1141 return iscsit_add_reject_cmd(cmd,
1142 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1143
1144 iscsit_attach_datain_req(cmd, dr);
1145 }
1146
1147 /*
1148 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1149 */
1150 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1151 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1152 cmd->data_direction, sam_task_attr,
1153 cmd->sense_buffer + 2);
1154
1155 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1156 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1157 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1158 conn->cid);
1159
1160 target_get_sess_cmd(&cmd->se_cmd, true);
1161
1162 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1163 scsilun_to_int(&hdr->lun));
1164 if (cmd->sense_reason)
1165 goto attach_cmd;
1166
1167 /* only used for printks or comparing with ->ref_task_tag */
1168 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1169 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1170 if (cmd->sense_reason) {
1171 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1172 return iscsit_add_reject_cmd(cmd,
1173 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1174 }
1175
1176 goto attach_cmd;
1177 }
1178
1179 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1180 return iscsit_add_reject_cmd(cmd,
1181 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1182 }
1183
1184 attach_cmd:
1185 spin_lock_bh(&conn->cmd_lock);
1186 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1187 spin_unlock_bh(&conn->cmd_lock);
1188 /*
1189 * Check if we need to delay processing because of ALUA
1190 * Active/NonOptimized primary access state..
1191 */
1192 core_alua_check_nonop_delay(&cmd->se_cmd);
1193
1194 return 0;
1195 }
1196 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1197
1198 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1199 {
1200 iscsit_set_dataout_sequence_values(cmd);
1201
1202 spin_lock_bh(&cmd->dataout_timeout_lock);
1203 iscsit_start_dataout_timer(cmd, cmd->conn);
1204 spin_unlock_bh(&cmd->dataout_timeout_lock);
1205 }
1206 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1207
1208 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1209 struct iscsi_scsi_req *hdr)
1210 {
1211 int cmdsn_ret = 0;
1212 /*
1213 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1214 * the Immediate Bit is not set, and no Immediate
1215 * Data is attached.
1216 *
1217 * A PDU/CmdSN carrying Immediate Data can only
1218 * be processed after the DataCRC has passed.
1219 * If the DataCRC fails, the CmdSN MUST NOT
1220 * be acknowledged. (See below)
1221 */
1222 if (!cmd->immediate_data) {
1223 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1224 (unsigned char *)hdr, hdr->cmdsn);
1225 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1226 return -1;
1227 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1228 target_put_sess_cmd(&cmd->se_cmd);
1229 return 0;
1230 }
1231 }
1232
1233 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1234
1235 /*
1236 * If no Immediate Data is attached, it's OK to return now.
1237 */
1238 if (!cmd->immediate_data) {
1239 if (!cmd->sense_reason && cmd->unsolicited_data)
1240 iscsit_set_unsoliticed_dataout(cmd);
1241 if (!cmd->sense_reason)
1242 return 0;
1243
1244 target_put_sess_cmd(&cmd->se_cmd);
1245 return 0;
1246 }
1247
1248 /*
1249 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1250 * execution. These exceptions are processed in CmdSN order using
1251 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1252 */
1253 if (cmd->sense_reason)
1254 return 1;
1255 /*
1256 * Call directly into transport_generic_new_cmd() to perform
1257 * the backend memory allocation.
1258 */
1259 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1260 if (cmd->sense_reason)
1261 return 1;
1262
1263 return 0;
1264 }
1265 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1266
1267 static int
1268 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1269 bool dump_payload)
1270 {
1271 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1272 /*
1273 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1274 */
1275 if (dump_payload)
1276 goto after_immediate_data;
1277 /*
1278 * Check for underflow case where both EDTL and immediate data payload
1279 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1280 * already been set in target_cmd_size_check() as se_cmd->data_length.
1281 *
1282 * For this special case, fail the command and dump the immediate data
1283 * payload.
1284 */
1285 if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1286 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1287 goto after_immediate_data;
1288 }
1289
1290 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1291 cmd->first_burst_len);
1292 after_immediate_data:
1293 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1294 /*
1295 * A PDU/CmdSN carrying Immediate Data passed
1296 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1297 * Immediate Bit is not set.
1298 */
1299 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1300 (unsigned char *)hdr, hdr->cmdsn);
1301 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1302 return -1;
1303
1304 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1305 int rc;
1306
1307 rc = iscsit_dump_data_payload(cmd->conn,
1308 cmd->first_burst_len, 1);
1309 target_put_sess_cmd(&cmd->se_cmd);
1310 return rc;
1311 } else if (cmd->unsolicited_data)
1312 iscsit_set_unsoliticed_dataout(cmd);
1313
1314 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1315 /*
1316 * Immediate Data failed DataCRC and ERL>=1,
1317 * silently drop this PDU and let the initiator
1318 * plug the CmdSN gap.
1319 *
1320 * FIXME: Send Unsolicited NOPIN with reserved
1321 * TTT here to help the initiator figure out
1322 * the missing CmdSN, although they should be
1323 * intelligent enough to determine the missing
1324 * CmdSN and issue a retry to plug the sequence.
1325 */
1326 cmd->i_state = ISTATE_REMOVE;
1327 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1328 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1329 return -1;
1330
1331 return 0;
1332 }
1333
1334 static int
1335 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1336 unsigned char *buf)
1337 {
1338 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1339 int rc, immed_data;
1340 bool dump_payload = false;
1341
1342 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1343 if (rc < 0)
1344 return 0;
1345 /*
1346 * Allocation iovecs needed for struct socket operations for
1347 * traditional iSCSI block I/O.
1348 */
1349 if (iscsit_allocate_iovecs(cmd) < 0) {
1350 return iscsit_reject_cmd(cmd,
1351 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1352 }
1353 immed_data = cmd->immediate_data;
1354
1355 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1356 if (rc < 0)
1357 return rc;
1358 else if (rc > 0)
1359 dump_payload = true;
1360
1361 if (!immed_data)
1362 return 0;
1363
1364 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1365 }
1366
1367 static u32 iscsit_do_crypto_hash_sg(
1368 struct ahash_request *hash,
1369 struct iscsi_cmd *cmd,
1370 u32 data_offset,
1371 u32 data_length,
1372 u32 padding,
1373 u8 *pad_bytes)
1374 {
1375 u32 data_crc;
1376 struct scatterlist *sg;
1377 unsigned int page_off;
1378
1379 crypto_ahash_init(hash);
1380
1381 sg = cmd->first_data_sg;
1382 page_off = cmd->first_data_sg_off;
1383
1384 while (data_length) {
1385 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1386
1387 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1388 crypto_ahash_update(hash);
1389
1390 data_length -= cur_len;
1391 page_off = 0;
1392 /* iscsit_map_iovec has already checked for invalid sg pointers */
1393 sg = sg_next(sg);
1394 }
1395
1396 if (padding) {
1397 struct scatterlist pad_sg;
1398
1399 sg_init_one(&pad_sg, pad_bytes, padding);
1400 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1401 padding);
1402 crypto_ahash_finup(hash);
1403 } else {
1404 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1405 crypto_ahash_final(hash);
1406 }
1407
1408 return data_crc;
1409 }
1410
1411 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1412 const void *buf, u32 payload_length, u32 padding,
1413 const void *pad_bytes, void *data_crc)
1414 {
1415 struct scatterlist sg[2];
1416
1417 sg_init_table(sg, ARRAY_SIZE(sg));
1418 sg_set_buf(sg, buf, payload_length);
1419 sg_set_buf(sg + 1, pad_bytes, padding);
1420
1421 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1422
1423 crypto_ahash_digest(hash);
1424 }
1425
1426 int
1427 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1428 struct iscsi_cmd *cmd, u32 payload_length,
1429 bool *success)
1430 {
1431 struct iscsi_data *hdr = buf;
1432 struct se_cmd *se_cmd;
1433 int rc;
1434
1435 /* iSCSI write */
1436 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1437
1438 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1439 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1440 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1441 payload_length, conn->cid);
1442
1443 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1444 pr_err("Command ITT: 0x%08x received DataOUT after"
1445 " last DataOUT received, dumping payload\n",
1446 cmd->init_task_tag);
1447 return iscsit_dump_data_payload(conn, payload_length, 1);
1448 }
1449
1450 if (cmd->data_direction != DMA_TO_DEVICE) {
1451 pr_err("Command ITT: 0x%08x received DataOUT for a"
1452 " NON-WRITE command.\n", cmd->init_task_tag);
1453 return iscsit_dump_data_payload(conn, payload_length, 1);
1454 }
1455 se_cmd = &cmd->se_cmd;
1456 iscsit_mod_dataout_timer(cmd);
1457
1458 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1459 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1460 be32_to_cpu(hdr->offset), payload_length,
1461 cmd->se_cmd.data_length);
1462 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1463 }
1464
1465 if (cmd->unsolicited_data) {
1466 int dump_unsolicited_data = 0;
1467
1468 if (conn->sess->sess_ops->InitialR2T) {
1469 pr_err("Received unexpected unsolicited data"
1470 " while InitialR2T=Yes, protocol error.\n");
1471 transport_send_check_condition_and_sense(&cmd->se_cmd,
1472 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1473 return -1;
1474 }
1475 /*
1476 * Special case for dealing with Unsolicited DataOUT
1477 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1478 * failures;
1479 */
1480
1481 /* Something's amiss if we're not in WRITE_PENDING state... */
1482 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1483 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1484 dump_unsolicited_data = 1;
1485
1486 if (dump_unsolicited_data) {
1487 /*
1488 * Check if a delayed TASK_ABORTED status needs to
1489 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1490 * received with the unsolicited data out.
1491 */
1492 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1493 iscsit_stop_dataout_timer(cmd);
1494
1495 transport_check_aborted_status(se_cmd,
1496 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1497 return iscsit_dump_data_payload(conn, payload_length, 1);
1498 }
1499 } else {
1500 /*
1501 * For the normal solicited data path:
1502 *
1503 * Check for a delayed TASK_ABORTED status and dump any
1504 * incoming data out payload if one exists. Also, when the
1505 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1506 * data out sequence, we decrement outstanding_r2ts. Once
1507 * outstanding_r2ts reaches zero, go ahead and send the delayed
1508 * TASK_ABORTED status.
1509 */
1510 if (se_cmd->transport_state & CMD_T_ABORTED) {
1511 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1512 if (--cmd->outstanding_r2ts < 1) {
1513 iscsit_stop_dataout_timer(cmd);
1514 transport_check_aborted_status(
1515 se_cmd, 1);
1516 }
1517
1518 return iscsit_dump_data_payload(conn, payload_length, 1);
1519 }
1520 }
1521 /*
1522 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1523 * within-command recovery checks before receiving the payload.
1524 */
1525 rc = iscsit_check_pre_dataout(cmd, buf);
1526 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1527 return 0;
1528 else if (rc == DATAOUT_CANNOT_RECOVER)
1529 return -1;
1530 *success = true;
1531 return 0;
1532 }
1533 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1534
1535 int
1536 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1537 struct iscsi_cmd **out_cmd)
1538 {
1539 struct iscsi_data *hdr = buf;
1540 struct iscsi_cmd *cmd;
1541 u32 payload_length = ntoh24(hdr->dlength);
1542 int rc;
1543 bool success = false;
1544
1545 if (!payload_length) {
1546 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1547 return 0;
1548 }
1549
1550 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1551 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1552 " MaxXmitDataSegmentLength: %u\n", payload_length,
1553 conn->conn_ops->MaxXmitDataSegmentLength);
1554 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1555 }
1556
1557 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1558 if (!cmd)
1559 return 0;
1560
1561 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1562
1563 if (success)
1564 *out_cmd = cmd;
1565
1566 return rc;
1567 }
1568 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1569
1570 static int
1571 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1572 struct iscsi_data *hdr)
1573 {
1574 struct kvec *iov;
1575 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1576 u32 payload_length = ntoh24(hdr->dlength);
1577 int iov_ret, data_crc_failed = 0;
1578
1579 rx_size += payload_length;
1580 iov = &cmd->iov_data[0];
1581
1582 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1583 payload_length);
1584 if (iov_ret < 0)
1585 return -1;
1586
1587 iov_count += iov_ret;
1588
1589 padding = ((-payload_length) & 3);
1590 if (padding != 0) {
1591 iov[iov_count].iov_base = cmd->pad_bytes;
1592 iov[iov_count++].iov_len = padding;
1593 rx_size += padding;
1594 pr_debug("Receiving %u padding bytes.\n", padding);
1595 }
1596
1597 if (conn->conn_ops->DataDigest) {
1598 iov[iov_count].iov_base = &checksum;
1599 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1600 rx_size += ISCSI_CRC_LEN;
1601 }
1602
1603 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1604
1605 iscsit_unmap_iovec(cmd);
1606
1607 if (rx_got != rx_size)
1608 return -1;
1609
1610 if (conn->conn_ops->DataDigest) {
1611 u32 data_crc;
1612
1613 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1614 be32_to_cpu(hdr->offset),
1615 payload_length, padding,
1616 cmd->pad_bytes);
1617
1618 if (checksum != data_crc) {
1619 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1620 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1621 " does not match computed 0x%08x\n",
1622 hdr->itt, hdr->offset, payload_length,
1623 hdr->datasn, checksum, data_crc);
1624 data_crc_failed = 1;
1625 } else {
1626 pr_debug("Got CRC32C DataDigest 0x%08x for"
1627 " %u bytes of Data Out\n", checksum,
1628 payload_length);
1629 }
1630 }
1631
1632 return data_crc_failed;
1633 }
1634
1635 int
1636 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1637 bool data_crc_failed)
1638 {
1639 struct iscsi_conn *conn = cmd->conn;
1640 int rc, ooo_cmdsn;
1641 /*
1642 * Increment post receive data and CRC values or perform
1643 * within-command recovery.
1644 */
1645 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1646 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1647 return 0;
1648 else if (rc == DATAOUT_SEND_R2T) {
1649 iscsit_set_dataout_sequence_values(cmd);
1650 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1651 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1652 /*
1653 * Handle extra special case for out of order
1654 * Unsolicited Data Out.
1655 */
1656 spin_lock_bh(&cmd->istate_lock);
1657 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1658 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1659 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1660 spin_unlock_bh(&cmd->istate_lock);
1661
1662 iscsit_stop_dataout_timer(cmd);
1663 if (ooo_cmdsn)
1664 return 0;
1665 target_execute_cmd(&cmd->se_cmd);
1666 return 0;
1667 } else /* DATAOUT_CANNOT_RECOVER */
1668 return -1;
1669
1670 return 0;
1671 }
1672 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1673
1674 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1675 {
1676 struct iscsi_cmd *cmd = NULL;
1677 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1678 int rc;
1679 bool data_crc_failed = false;
1680
1681 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1682 if (rc < 0)
1683 return 0;
1684 else if (!cmd)
1685 return 0;
1686
1687 rc = iscsit_get_dataout(conn, cmd, hdr);
1688 if (rc < 0)
1689 return rc;
1690 else if (rc > 0)
1691 data_crc_failed = true;
1692
1693 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1694 }
1695
1696 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1697 struct iscsi_nopout *hdr)
1698 {
1699 u32 payload_length = ntoh24(hdr->dlength);
1700
1701 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1702 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1703 if (!cmd)
1704 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1705 (unsigned char *)hdr);
1706
1707 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1708 (unsigned char *)hdr);
1709 }
1710
1711 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1712 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1713 " not set, protocol error.\n");
1714 if (!cmd)
1715 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1716 (unsigned char *)hdr);
1717
1718 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1719 (unsigned char *)hdr);
1720 }
1721
1722 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1723 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1724 " greater than MaxXmitDataSegmentLength: %u, protocol"
1725 " error.\n", payload_length,
1726 conn->conn_ops->MaxXmitDataSegmentLength);
1727 if (!cmd)
1728 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1729 (unsigned char *)hdr);
1730
1731 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1732 (unsigned char *)hdr);
1733 }
1734
1735 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1736 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1737 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1738 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1739 payload_length);
1740 /*
1741 * This is not a response to a Unsolicited NopIN, which means
1742 * it can either be a NOPOUT ping request (with a valid ITT),
1743 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1744 * Either way, make sure we allocate an struct iscsi_cmd, as both
1745 * can contain ping data.
1746 */
1747 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1748 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1749 cmd->i_state = ISTATE_SEND_NOPIN;
1750 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1751 1 : 0);
1752 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1753 cmd->targ_xfer_tag = 0xFFFFFFFF;
1754 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1755 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1756 cmd->data_direction = DMA_NONE;
1757 }
1758
1759 return 0;
1760 }
1761 EXPORT_SYMBOL(iscsit_setup_nop_out);
1762
1763 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1764 struct iscsi_nopout *hdr)
1765 {
1766 struct iscsi_cmd *cmd_p = NULL;
1767 int cmdsn_ret = 0;
1768 /*
1769 * Initiator is expecting a NopIN ping reply..
1770 */
1771 if (hdr->itt != RESERVED_ITT) {
1772 if (!cmd)
1773 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1774 (unsigned char *)hdr);
1775
1776 spin_lock_bh(&conn->cmd_lock);
1777 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1778 spin_unlock_bh(&conn->cmd_lock);
1779
1780 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1781
1782 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1783 iscsit_add_cmd_to_response_queue(cmd, conn,
1784 cmd->i_state);
1785 return 0;
1786 }
1787
1788 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1789 (unsigned char *)hdr, hdr->cmdsn);
1790 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1791 return 0;
1792 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1793 return -1;
1794
1795 return 0;
1796 }
1797 /*
1798 * This was a response to a unsolicited NOPIN ping.
1799 */
1800 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1801 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1802 if (!cmd_p)
1803 return -EINVAL;
1804
1805 iscsit_stop_nopin_response_timer(conn);
1806
1807 cmd_p->i_state = ISTATE_REMOVE;
1808 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1809
1810 iscsit_start_nopin_timer(conn);
1811 return 0;
1812 }
1813 /*
1814 * Otherwise, initiator is not expecting a NOPIN is response.
1815 * Just ignore for now.
1816 */
1817
1818 if (cmd)
1819 iscsit_free_cmd(cmd, false);
1820
1821 return 0;
1822 }
1823 EXPORT_SYMBOL(iscsit_process_nop_out);
1824
1825 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1826 unsigned char *buf)
1827 {
1828 unsigned char *ping_data = NULL;
1829 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1830 struct kvec *iov = NULL;
1831 u32 payload_length = ntoh24(hdr->dlength);
1832 int ret;
1833
1834 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1835 if (ret < 0)
1836 return 0;
1837 /*
1838 * Handle NOP-OUT payload for traditional iSCSI sockets
1839 */
1840 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1841 u32 checksum, data_crc, padding = 0;
1842 int niov = 0, rx_got, rx_size = payload_length;
1843
1844 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1845 if (!ping_data) {
1846 ret = -1;
1847 goto out;
1848 }
1849
1850 iov = &cmd->iov_misc[0];
1851 iov[niov].iov_base = ping_data;
1852 iov[niov++].iov_len = payload_length;
1853
1854 padding = ((-payload_length) & 3);
1855 if (padding != 0) {
1856 pr_debug("Receiving %u additional bytes"
1857 " for padding.\n", padding);
1858 iov[niov].iov_base = &cmd->pad_bytes;
1859 iov[niov++].iov_len = padding;
1860 rx_size += padding;
1861 }
1862 if (conn->conn_ops->DataDigest) {
1863 iov[niov].iov_base = &checksum;
1864 iov[niov++].iov_len = ISCSI_CRC_LEN;
1865 rx_size += ISCSI_CRC_LEN;
1866 }
1867
1868 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1869 if (rx_got != rx_size) {
1870 ret = -1;
1871 goto out;
1872 }
1873
1874 if (conn->conn_ops->DataDigest) {
1875 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1876 payload_length, padding,
1877 cmd->pad_bytes, &data_crc);
1878
1879 if (checksum != data_crc) {
1880 pr_err("Ping data CRC32C DataDigest"
1881 " 0x%08x does not match computed 0x%08x\n",
1882 checksum, data_crc);
1883 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1884 pr_err("Unable to recover from"
1885 " NOPOUT Ping DataCRC failure while in"
1886 " ERL=0.\n");
1887 ret = -1;
1888 goto out;
1889 } else {
1890 /*
1891 * Silently drop this PDU and let the
1892 * initiator plug the CmdSN gap.
1893 */
1894 pr_debug("Dropping NOPOUT"
1895 " Command CmdSN: 0x%08x due to"
1896 " DataCRC error.\n", hdr->cmdsn);
1897 ret = 0;
1898 goto out;
1899 }
1900 } else {
1901 pr_debug("Got CRC32C DataDigest"
1902 " 0x%08x for %u bytes of ping data.\n",
1903 checksum, payload_length);
1904 }
1905 }
1906
1907 ping_data[payload_length] = '\0';
1908 /*
1909 * Attach ping data to struct iscsi_cmd->buf_ptr.
1910 */
1911 cmd->buf_ptr = ping_data;
1912 cmd->buf_ptr_size = payload_length;
1913
1914 pr_debug("Got %u bytes of NOPOUT ping"
1915 " data.\n", payload_length);
1916 pr_debug("Ping Data: \"%s\"\n", ping_data);
1917 }
1918
1919 return iscsit_process_nop_out(conn, cmd, hdr);
1920 out:
1921 if (cmd)
1922 iscsit_free_cmd(cmd, false);
1923
1924 kfree(ping_data);
1925 return ret;
1926 }
1927
1928 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1929 {
1930 switch (iscsi_tmf) {
1931 case ISCSI_TM_FUNC_ABORT_TASK:
1932 return TMR_ABORT_TASK;
1933 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1934 return TMR_ABORT_TASK_SET;
1935 case ISCSI_TM_FUNC_CLEAR_ACA:
1936 return TMR_CLEAR_ACA;
1937 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1938 return TMR_CLEAR_TASK_SET;
1939 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1940 return TMR_LUN_RESET;
1941 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1942 return TMR_TARGET_WARM_RESET;
1943 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1944 return TMR_TARGET_COLD_RESET;
1945 default:
1946 return TMR_UNKNOWN;
1947 }
1948 }
1949
1950 int
1951 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1952 unsigned char *buf)
1953 {
1954 struct se_tmr_req *se_tmr;
1955 struct iscsi_tmr_req *tmr_req;
1956 struct iscsi_tm *hdr;
1957 int out_of_order_cmdsn = 0, ret;
1958 u8 function, tcm_function = TMR_UNKNOWN;
1959
1960 hdr = (struct iscsi_tm *) buf;
1961 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1962 function = hdr->flags;
1963
1964 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1965 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1966 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1967 hdr->rtt, hdr->refcmdsn, conn->cid);
1968
1969 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1970 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1971 hdr->rtt != RESERVED_ITT)) {
1972 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1973 hdr->rtt = RESERVED_ITT;
1974 }
1975
1976 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1977 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1978 pr_err("Task Management Request TASK_REASSIGN not"
1979 " issued as immediate command, bad iSCSI Initiator"
1980 "implementation\n");
1981 return iscsit_add_reject_cmd(cmd,
1982 ISCSI_REASON_PROTOCOL_ERROR, buf);
1983 }
1984 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1985 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1986 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1987
1988 cmd->data_direction = DMA_NONE;
1989 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1990 if (!cmd->tmr_req) {
1991 return iscsit_add_reject_cmd(cmd,
1992 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1993 buf);
1994 }
1995
1996 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1997 conn->sess->se_sess, 0, DMA_NONE,
1998 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1999
2000 target_get_sess_cmd(&cmd->se_cmd, true);
2001
2002 /*
2003 * TASK_REASSIGN for ERL=2 / connection stays inside of
2004 * LIO-Target $FABRIC_MOD
2005 */
2006 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2007 tcm_function = iscsit_convert_tmf(function);
2008 if (tcm_function == TMR_UNKNOWN) {
2009 pr_err("Unknown iSCSI TMR Function:"
2010 " 0x%02x\n", function);
2011 return iscsit_add_reject_cmd(cmd,
2012 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2013 }
2014 }
2015 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2016 GFP_KERNEL);
2017 if (ret < 0)
2018 return iscsit_add_reject_cmd(cmd,
2019 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2020
2021 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2022
2023 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2024 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2025 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2026 cmd->init_task_tag = hdr->itt;
2027 cmd->targ_xfer_tag = 0xFFFFFFFF;
2028 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2029 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2030 se_tmr = cmd->se_cmd.se_tmr_req;
2031 tmr_req = cmd->tmr_req;
2032 /*
2033 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2034 */
2035 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2036 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2037 scsilun_to_int(&hdr->lun));
2038 if (ret < 0) {
2039 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2040 goto attach;
2041 }
2042 }
2043
2044 switch (function) {
2045 case ISCSI_TM_FUNC_ABORT_TASK:
2046 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2047 if (se_tmr->response)
2048 goto attach;
2049 break;
2050 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2051 case ISCSI_TM_FUNC_CLEAR_ACA:
2052 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2053 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2054 break;
2055 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2056 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2057 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2058 goto attach;
2059 }
2060 break;
2061 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2062 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2063 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2064 goto attach;
2065 }
2066 break;
2067 case ISCSI_TM_FUNC_TASK_REASSIGN:
2068 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2069 /*
2070 * Perform sanity checks on the ExpDataSN only if the
2071 * TASK_REASSIGN was successful.
2072 */
2073 if (se_tmr->response)
2074 break;
2075
2076 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2077 return iscsit_add_reject_cmd(cmd,
2078 ISCSI_REASON_BOOKMARK_INVALID, buf);
2079 break;
2080 default:
2081 pr_err("Unknown TMR function: 0x%02x, protocol"
2082 " error.\n", function);
2083 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2084 goto attach;
2085 }
2086
2087 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2088 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2089 se_tmr->call_transport = 1;
2090 attach:
2091 spin_lock_bh(&conn->cmd_lock);
2092 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2093 spin_unlock_bh(&conn->cmd_lock);
2094
2095 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2096 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2097 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2098 out_of_order_cmdsn = 1;
2099 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2100 target_put_sess_cmd(&cmd->se_cmd);
2101 return 0;
2102 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2103 return -1;
2104 }
2105 }
2106 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2107
2108 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2109 return 0;
2110 /*
2111 * Found the referenced task, send to transport for processing.
2112 */
2113 if (se_tmr->call_transport)
2114 return transport_generic_handle_tmr(&cmd->se_cmd);
2115
2116 /*
2117 * Could not find the referenced LUN, task, or Task Management
2118 * command not authorized or supported. Change state and
2119 * let the tx_thread send the response.
2120 *
2121 * For connection recovery, this is also the default action for
2122 * TMR TASK_REASSIGN.
2123 */
2124 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2125 target_put_sess_cmd(&cmd->se_cmd);
2126 return 0;
2127 }
2128 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2129
2130 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2131 int
2132 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2133 struct iscsi_text *hdr)
2134 {
2135 u32 payload_length = ntoh24(hdr->dlength);
2136
2137 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2138 pr_err("Unable to accept text parameter length: %u"
2139 "greater than MaxXmitDataSegmentLength %u.\n",
2140 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2141 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2142 (unsigned char *)hdr);
2143 }
2144
2145 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2146 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2147 pr_err("Multi sequence text commands currently not supported\n");
2148 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2149 (unsigned char *)hdr);
2150 }
2151
2152 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2153 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2154 hdr->exp_statsn, payload_length);
2155
2156 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2157 cmd->i_state = ISTATE_SEND_TEXTRSP;
2158 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2159 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2160 cmd->targ_xfer_tag = 0xFFFFFFFF;
2161 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2162 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2163 cmd->data_direction = DMA_NONE;
2164 kfree(cmd->text_in_ptr);
2165 cmd->text_in_ptr = NULL;
2166
2167 return 0;
2168 }
2169 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2170
2171 int
2172 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2173 struct iscsi_text *hdr)
2174 {
2175 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2176 int cmdsn_ret;
2177
2178 if (!text_in) {
2179 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2180 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2181 pr_err("Unable to locate text_in buffer for sendtargets"
2182 " discovery\n");
2183 goto reject;
2184 }
2185 goto empty_sendtargets;
2186 }
2187 if (strncmp("SendTargets", text_in, 11) != 0) {
2188 pr_err("Received Text Data that is not"
2189 " SendTargets, cannot continue.\n");
2190 goto reject;
2191 }
2192 text_ptr = strchr(text_in, '=');
2193 if (!text_ptr) {
2194 pr_err("No \"=\" separator found in Text Data,"
2195 " cannot continue.\n");
2196 goto reject;
2197 }
2198 if (!strncmp("=All", text_ptr, 4)) {
2199 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2200 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2201 !strncmp("=eui.", text_ptr, 5)) {
2202 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2203 } else {
2204 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2205 goto reject;
2206 }
2207
2208 spin_lock_bh(&conn->cmd_lock);
2209 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2210 spin_unlock_bh(&conn->cmd_lock);
2211
2212 empty_sendtargets:
2213 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2214
2215 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2216 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2217 (unsigned char *)hdr, hdr->cmdsn);
2218 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2219 return -1;
2220
2221 return 0;
2222 }
2223
2224 return iscsit_execute_cmd(cmd, 0);
2225
2226 reject:
2227 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2228 (unsigned char *)hdr);
2229 }
2230 EXPORT_SYMBOL(iscsit_process_text_cmd);
2231
2232 static int
2233 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2234 unsigned char *buf)
2235 {
2236 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2237 char *text_in = NULL;
2238 u32 payload_length = ntoh24(hdr->dlength);
2239 int rx_size, rc;
2240
2241 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2242 if (rc < 0)
2243 return 0;
2244
2245 rx_size = payload_length;
2246 if (payload_length) {
2247 u32 checksum = 0, data_crc = 0;
2248 u32 padding = 0, pad_bytes = 0;
2249 int niov = 0, rx_got;
2250 struct kvec iov[3];
2251
2252 text_in = kzalloc(payload_length, GFP_KERNEL);
2253 if (!text_in)
2254 goto reject;
2255
2256 cmd->text_in_ptr = text_in;
2257
2258 memset(iov, 0, 3 * sizeof(struct kvec));
2259 iov[niov].iov_base = text_in;
2260 iov[niov++].iov_len = payload_length;
2261
2262 padding = ((-payload_length) & 3);
2263 if (padding != 0) {
2264 iov[niov].iov_base = &pad_bytes;
2265 iov[niov++].iov_len = padding;
2266 rx_size += padding;
2267 pr_debug("Receiving %u additional bytes"
2268 " for padding.\n", padding);
2269 }
2270 if (conn->conn_ops->DataDigest) {
2271 iov[niov].iov_base = &checksum;
2272 iov[niov++].iov_len = ISCSI_CRC_LEN;
2273 rx_size += ISCSI_CRC_LEN;
2274 }
2275
2276 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2277 if (rx_got != rx_size)
2278 goto reject;
2279
2280 if (conn->conn_ops->DataDigest) {
2281 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, text_in,
2282 payload_length, padding,
2283 &pad_bytes, &data_crc);
2284
2285 if (checksum != data_crc) {
2286 pr_err("Text data CRC32C DataDigest"
2287 " 0x%08x does not match computed"
2288 " 0x%08x\n", checksum, data_crc);
2289 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2290 pr_err("Unable to recover from"
2291 " Text Data digest failure while in"
2292 " ERL=0.\n");
2293 goto reject;
2294 } else {
2295 /*
2296 * Silently drop this PDU and let the
2297 * initiator plug the CmdSN gap.
2298 */
2299 pr_debug("Dropping Text"
2300 " Command CmdSN: 0x%08x due to"
2301 " DataCRC error.\n", hdr->cmdsn);
2302 kfree(text_in);
2303 return 0;
2304 }
2305 } else {
2306 pr_debug("Got CRC32C DataDigest"
2307 " 0x%08x for %u bytes of text data.\n",
2308 checksum, payload_length);
2309 }
2310 }
2311 text_in[payload_length - 1] = '\0';
2312 pr_debug("Successfully read %d bytes of text"
2313 " data.\n", payload_length);
2314 }
2315
2316 return iscsit_process_text_cmd(conn, cmd, hdr);
2317
2318 reject:
2319 kfree(cmd->text_in_ptr);
2320 cmd->text_in_ptr = NULL;
2321 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2322 }
2323
2324 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2325 {
2326 struct iscsi_conn *conn_p;
2327 struct iscsi_session *sess = conn->sess;
2328
2329 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2330 " for SID: %u.\n", conn->cid, conn->sess->sid);
2331
2332 atomic_set(&sess->session_logout, 1);
2333 atomic_set(&conn->conn_logout_remove, 1);
2334 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2335
2336 iscsit_inc_conn_usage_count(conn);
2337 iscsit_inc_session_usage_count(sess);
2338
2339 spin_lock_bh(&sess->conn_lock);
2340 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2341 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2342 continue;
2343
2344 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2345 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2346 }
2347 spin_unlock_bh(&sess->conn_lock);
2348
2349 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2350
2351 return 0;
2352 }
2353
2354 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2355 {
2356 struct iscsi_conn *l_conn;
2357 struct iscsi_session *sess = conn->sess;
2358
2359 pr_debug("Received logout request CLOSECONNECTION for CID:"
2360 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2361
2362 /*
2363 * A Logout Request with a CLOSECONNECTION reason code for a CID
2364 * can arrive on a connection with a differing CID.
2365 */
2366 if (conn->cid == cmd->logout_cid) {
2367 spin_lock_bh(&conn->state_lock);
2368 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2369 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2370
2371 atomic_set(&conn->conn_logout_remove, 1);
2372 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2373 iscsit_inc_conn_usage_count(conn);
2374
2375 spin_unlock_bh(&conn->state_lock);
2376 } else {
2377 /*
2378 * Handle all different cid CLOSECONNECTION requests in
2379 * iscsit_logout_post_handler_diffcid() as to give enough
2380 * time for any non immediate command's CmdSN to be
2381 * acknowledged on the connection in question.
2382 *
2383 * Here we simply make sure the CID is still around.
2384 */
2385 l_conn = iscsit_get_conn_from_cid(sess,
2386 cmd->logout_cid);
2387 if (!l_conn) {
2388 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2389 iscsit_add_cmd_to_response_queue(cmd, conn,
2390 cmd->i_state);
2391 return 0;
2392 }
2393
2394 iscsit_dec_conn_usage_count(l_conn);
2395 }
2396
2397 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2398
2399 return 0;
2400 }
2401
2402 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2403 {
2404 struct iscsi_session *sess = conn->sess;
2405
2406 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2407 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2408
2409 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2410 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2411 " while ERL!=2.\n");
2412 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2413 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2414 return 0;
2415 }
2416
2417 if (conn->cid == cmd->logout_cid) {
2418 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2419 " with CID: %hu on CID: %hu, implementation error.\n",
2420 cmd->logout_cid, conn->cid);
2421 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2422 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2423 return 0;
2424 }
2425
2426 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2427
2428 return 0;
2429 }
2430
2431 int
2432 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2433 unsigned char *buf)
2434 {
2435 int cmdsn_ret, logout_remove = 0;
2436 u8 reason_code = 0;
2437 struct iscsi_logout *hdr;
2438 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2439
2440 hdr = (struct iscsi_logout *) buf;
2441 reason_code = (hdr->flags & 0x7f);
2442
2443 if (tiqn) {
2444 spin_lock(&tiqn->logout_stats.lock);
2445 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2446 tiqn->logout_stats.normal_logouts++;
2447 else
2448 tiqn->logout_stats.abnormal_logouts++;
2449 spin_unlock(&tiqn->logout_stats.lock);
2450 }
2451
2452 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2453 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2454 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2455 hdr->cid, conn->cid);
2456
2457 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2458 pr_err("Received logout request on connection that"
2459 " is not in logged in state, ignoring request.\n");
2460 iscsit_free_cmd(cmd, false);
2461 return 0;
2462 }
2463
2464 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2465 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2466 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2467 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2468 cmd->targ_xfer_tag = 0xFFFFFFFF;
2469 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2470 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2471 cmd->logout_cid = be16_to_cpu(hdr->cid);
2472 cmd->logout_reason = reason_code;
2473 cmd->data_direction = DMA_NONE;
2474
2475 /*
2476 * We need to sleep in these cases (by returning 1) until the Logout
2477 * Response gets sent in the tx thread.
2478 */
2479 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2480 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2481 be16_to_cpu(hdr->cid) == conn->cid))
2482 logout_remove = 1;
2483
2484 spin_lock_bh(&conn->cmd_lock);
2485 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2486 spin_unlock_bh(&conn->cmd_lock);
2487
2488 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2489 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2490
2491 /*
2492 * Immediate commands are executed, well, immediately.
2493 * Non-Immediate Logout Commands are executed in CmdSN order.
2494 */
2495 if (cmd->immediate_cmd) {
2496 int ret = iscsit_execute_cmd(cmd, 0);
2497
2498 if (ret < 0)
2499 return ret;
2500 } else {
2501 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2502 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2503 logout_remove = 0;
2504 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2505 return -1;
2506 }
2507
2508 return logout_remove;
2509 }
2510 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2511
2512 int iscsit_handle_snack(
2513 struct iscsi_conn *conn,
2514 unsigned char *buf)
2515 {
2516 struct iscsi_snack *hdr;
2517
2518 hdr = (struct iscsi_snack *) buf;
2519 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2520
2521 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2522 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2523 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2524 hdr->begrun, hdr->runlength, conn->cid);
2525
2526 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2527 pr_err("Initiator sent SNACK request while in"
2528 " ErrorRecoveryLevel=0.\n");
2529 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2530 buf);
2531 }
2532 /*
2533 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2534 * call from inside iscsi_send_recovery_datain_or_r2t().
2535 */
2536 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2537 case 0:
2538 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2539 hdr->itt,
2540 be32_to_cpu(hdr->ttt),
2541 be32_to_cpu(hdr->begrun),
2542 be32_to_cpu(hdr->runlength));
2543 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2544 return iscsit_handle_status_snack(conn, hdr->itt,
2545 be32_to_cpu(hdr->ttt),
2546 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2547 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2548 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2549 be32_to_cpu(hdr->begrun),
2550 be32_to_cpu(hdr->runlength));
2551 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2552 /* FIXME: Support R-Data SNACK */
2553 pr_err("R-Data SNACK Not Supported.\n");
2554 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2555 buf);
2556 default:
2557 pr_err("Unknown SNACK type 0x%02x, protocol"
2558 " error.\n", hdr->flags & 0x0f);
2559 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2560 buf);
2561 }
2562
2563 return 0;
2564 }
2565 EXPORT_SYMBOL(iscsit_handle_snack);
2566
2567 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2568 {
2569 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2570 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2571 wait_for_completion_interruptible_timeout(
2572 &conn->rx_half_close_comp,
2573 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2574 }
2575 }
2576
2577 static int iscsit_handle_immediate_data(
2578 struct iscsi_cmd *cmd,
2579 struct iscsi_scsi_req *hdr,
2580 u32 length)
2581 {
2582 int iov_ret, rx_got = 0, rx_size = 0;
2583 u32 checksum, iov_count = 0, padding = 0;
2584 struct iscsi_conn *conn = cmd->conn;
2585 struct kvec *iov;
2586
2587 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2588 if (iov_ret < 0)
2589 return IMMEDIATE_DATA_CANNOT_RECOVER;
2590
2591 rx_size = length;
2592 iov_count = iov_ret;
2593 iov = &cmd->iov_data[0];
2594
2595 padding = ((-length) & 3);
2596 if (padding != 0) {
2597 iov[iov_count].iov_base = cmd->pad_bytes;
2598 iov[iov_count++].iov_len = padding;
2599 rx_size += padding;
2600 }
2601
2602 if (conn->conn_ops->DataDigest) {
2603 iov[iov_count].iov_base = &checksum;
2604 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2605 rx_size += ISCSI_CRC_LEN;
2606 }
2607
2608 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2609
2610 iscsit_unmap_iovec(cmd);
2611
2612 if (rx_got != rx_size) {
2613 iscsit_rx_thread_wait_for_tcp(conn);
2614 return IMMEDIATE_DATA_CANNOT_RECOVER;
2615 }
2616
2617 if (conn->conn_ops->DataDigest) {
2618 u32 data_crc;
2619
2620 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2621 cmd->write_data_done, length, padding,
2622 cmd->pad_bytes);
2623
2624 if (checksum != data_crc) {
2625 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2626 " does not match computed 0x%08x\n", checksum,
2627 data_crc);
2628
2629 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2630 pr_err("Unable to recover from"
2631 " Immediate Data digest failure while"
2632 " in ERL=0.\n");
2633 iscsit_reject_cmd(cmd,
2634 ISCSI_REASON_DATA_DIGEST_ERROR,
2635 (unsigned char *)hdr);
2636 return IMMEDIATE_DATA_CANNOT_RECOVER;
2637 } else {
2638 iscsit_reject_cmd(cmd,
2639 ISCSI_REASON_DATA_DIGEST_ERROR,
2640 (unsigned char *)hdr);
2641 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2642 }
2643 } else {
2644 pr_debug("Got CRC32C DataDigest 0x%08x for"
2645 " %u bytes of Immediate Data\n", checksum,
2646 length);
2647 }
2648 }
2649
2650 cmd->write_data_done += length;
2651
2652 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2653 spin_lock_bh(&cmd->istate_lock);
2654 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2655 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2656 spin_unlock_bh(&cmd->istate_lock);
2657 }
2658
2659 return IMMEDIATE_DATA_NORMAL_OPERATION;
2660 }
2661
2662 /*
2663 * Called with sess->conn_lock held.
2664 */
2665 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2666 with active network interface */
2667 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2668 {
2669 struct iscsi_cmd *cmd;
2670 struct iscsi_conn *conn_p;
2671 bool found = false;
2672
2673 /*
2674 * Only send a Asynchronous Message on connections whos network
2675 * interface is still functional.
2676 */
2677 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2678 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2679 iscsit_inc_conn_usage_count(conn_p);
2680 found = true;
2681 break;
2682 }
2683 }
2684
2685 if (!found)
2686 return;
2687
2688 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2689 if (!cmd) {
2690 iscsit_dec_conn_usage_count(conn_p);
2691 return;
2692 }
2693
2694 cmd->logout_cid = conn->cid;
2695 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2696 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2697
2698 spin_lock_bh(&conn_p->cmd_lock);
2699 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2700 spin_unlock_bh(&conn_p->cmd_lock);
2701
2702 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2703 iscsit_dec_conn_usage_count(conn_p);
2704 }
2705
2706 static int iscsit_send_conn_drop_async_message(
2707 struct iscsi_cmd *cmd,
2708 struct iscsi_conn *conn)
2709 {
2710 struct iscsi_async *hdr;
2711
2712 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2713
2714 hdr = (struct iscsi_async *) cmd->pdu;
2715 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2716 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2717 cmd->init_task_tag = RESERVED_ITT;
2718 cmd->targ_xfer_tag = 0xFFFFFFFF;
2719 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2720 cmd->stat_sn = conn->stat_sn++;
2721 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2722 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2723 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2724 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2725 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2726 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2727 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2728
2729 pr_debug("Sending Connection Dropped Async Message StatSN:"
2730 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2731 cmd->logout_cid, conn->cid);
2732
2733 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2734 }
2735
2736 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2737 {
2738 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2739 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2740 wait_for_completion_interruptible_timeout(
2741 &conn->tx_half_close_comp,
2742 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2743 }
2744 }
2745
2746 void
2747 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2748 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2749 bool set_statsn)
2750 {
2751 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2752 hdr->flags = datain->flags;
2753 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2754 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2755 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2756 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2757 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2758 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2759 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2760 }
2761 }
2762 hton24(hdr->dlength, datain->length);
2763 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2764 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2765 (struct scsi_lun *)&hdr->lun);
2766 else
2767 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2768
2769 hdr->itt = cmd->init_task_tag;
2770
2771 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2772 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2773 else
2774 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2775 if (set_statsn)
2776 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2777 else
2778 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2779
2780 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2781 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2782 hdr->datasn = cpu_to_be32(datain->data_sn);
2783 hdr->offset = cpu_to_be32(datain->offset);
2784
2785 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2786 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2787 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2788 ntohl(hdr->offset), datain->length, conn->cid);
2789 }
2790 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2791
2792 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2793 {
2794 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2795 struct iscsi_datain datain;
2796 struct iscsi_datain_req *dr;
2797 int eodr = 0, ret;
2798 bool set_statsn = false;
2799
2800 memset(&datain, 0, sizeof(struct iscsi_datain));
2801 dr = iscsit_get_datain_values(cmd, &datain);
2802 if (!dr) {
2803 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2804 cmd->init_task_tag);
2805 return -1;
2806 }
2807 /*
2808 * Be paranoid and double check the logic for now.
2809 */
2810 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2811 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2812 " datain.length: %u exceeds cmd->data_length: %u\n",
2813 cmd->init_task_tag, datain.offset, datain.length,
2814 cmd->se_cmd.data_length);
2815 return -1;
2816 }
2817
2818 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2819 /*
2820 * Special case for successfully execution w/ both DATAIN
2821 * and Sense Data.
2822 */
2823 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2824 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2825 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2826 else {
2827 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2828 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2829 iscsit_increment_maxcmdsn(cmd, conn->sess);
2830 cmd->stat_sn = conn->stat_sn++;
2831 set_statsn = true;
2832 } else if (dr->dr_complete ==
2833 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2834 set_statsn = true;
2835 }
2836
2837 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2838
2839 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2840 if (ret < 0)
2841 return ret;
2842
2843 if (dr->dr_complete) {
2844 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2845 2 : 1;
2846 iscsit_free_datain_req(cmd, dr);
2847 }
2848
2849 return eodr;
2850 }
2851
2852 int
2853 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2854 struct iscsi_logout_rsp *hdr)
2855 {
2856 struct iscsi_conn *logout_conn = NULL;
2857 struct iscsi_conn_recovery *cr = NULL;
2858 struct iscsi_session *sess = conn->sess;
2859 /*
2860 * The actual shutting down of Sessions and/or Connections
2861 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2862 * is done in scsi_logout_post_handler().
2863 */
2864 switch (cmd->logout_reason) {
2865 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2866 pr_debug("iSCSI session logout successful, setting"
2867 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2868 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2869 break;
2870 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2871 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2872 break;
2873 /*
2874 * For CLOSECONNECTION logout requests carrying
2875 * a matching logout CID -> local CID, the reference
2876 * for the local CID will have been incremented in
2877 * iscsi_logout_closeconnection().
2878 *
2879 * For CLOSECONNECTION logout requests carrying
2880 * a different CID than the connection it arrived
2881 * on, the connection responding to cmd->logout_cid
2882 * is stopped in iscsit_logout_post_handler_diffcid().
2883 */
2884
2885 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2886 " successful.\n", cmd->logout_cid, conn->cid);
2887 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2888 break;
2889 case ISCSI_LOGOUT_REASON_RECOVERY:
2890 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2891 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2892 break;
2893 /*
2894 * If the connection is still active from our point of view
2895 * force connection recovery to occur.
2896 */
2897 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2898 cmd->logout_cid);
2899 if (logout_conn) {
2900 iscsit_connection_reinstatement_rcfr(logout_conn);
2901 iscsit_dec_conn_usage_count(logout_conn);
2902 }
2903
2904 cr = iscsit_get_inactive_connection_recovery_entry(
2905 conn->sess, cmd->logout_cid);
2906 if (!cr) {
2907 pr_err("Unable to locate CID: %hu for"
2908 " REMOVECONNFORRECOVERY Logout Request.\n",
2909 cmd->logout_cid);
2910 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2911 break;
2912 }
2913
2914 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2915
2916 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2917 " for recovery for CID: %hu on CID: %hu successful.\n",
2918 cmd->logout_cid, conn->cid);
2919 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2920 break;
2921 default:
2922 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2923 cmd->logout_reason);
2924 return -1;
2925 }
2926
2927 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2928 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2929 hdr->response = cmd->logout_response;
2930 hdr->itt = cmd->init_task_tag;
2931 cmd->stat_sn = conn->stat_sn++;
2932 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2933
2934 iscsit_increment_maxcmdsn(cmd, conn->sess);
2935 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2936 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2937
2938 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2939 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2940 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2941 cmd->logout_cid, conn->cid);
2942
2943 return 0;
2944 }
2945 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2946
2947 static int
2948 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2949 {
2950 int rc;
2951
2952 rc = iscsit_build_logout_rsp(cmd, conn,
2953 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2954 if (rc < 0)
2955 return rc;
2956
2957 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2958 }
2959
2960 void
2961 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2962 struct iscsi_nopin *hdr, bool nopout_response)
2963 {
2964 hdr->opcode = ISCSI_OP_NOOP_IN;
2965 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2966 hton24(hdr->dlength, cmd->buf_ptr_size);
2967 if (nopout_response)
2968 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2969 hdr->itt = cmd->init_task_tag;
2970 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2971 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2972 conn->stat_sn;
2973 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2974
2975 if (nopout_response)
2976 iscsit_increment_maxcmdsn(cmd, conn->sess);
2977
2978 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2979 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2980
2981 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2982 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2983 "Solicited" : "Unsolicited", cmd->init_task_tag,
2984 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2985 }
2986 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2987
2988 /*
2989 * Unsolicited NOPIN, either requesting a response or not.
2990 */
2991 static int iscsit_send_unsolicited_nopin(
2992 struct iscsi_cmd *cmd,
2993 struct iscsi_conn *conn,
2994 int want_response)
2995 {
2996 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2997 int ret;
2998
2999 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3000
3001 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3002 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3003
3004 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3005 if (ret < 0)
3006 return ret;
3007
3008 spin_lock_bh(&cmd->istate_lock);
3009 cmd->i_state = want_response ?
3010 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3011 spin_unlock_bh(&cmd->istate_lock);
3012
3013 return 0;
3014 }
3015
3016 static int
3017 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3018 {
3019 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3020
3021 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3022
3023 /*
3024 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3025 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3026 */
3027 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3028
3029 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3030 cmd->buf_ptr,
3031 cmd->buf_ptr_size);
3032 }
3033
3034 static int iscsit_send_r2t(
3035 struct iscsi_cmd *cmd,
3036 struct iscsi_conn *conn)
3037 {
3038 struct iscsi_r2t *r2t;
3039 struct iscsi_r2t_rsp *hdr;
3040 int ret;
3041
3042 r2t = iscsit_get_r2t_from_list(cmd);
3043 if (!r2t)
3044 return -1;
3045
3046 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3047 memset(hdr, 0, ISCSI_HDR_LEN);
3048 hdr->opcode = ISCSI_OP_R2T;
3049 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3050 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3051 (struct scsi_lun *)&hdr->lun);
3052 hdr->itt = cmd->init_task_tag;
3053 if (conn->conn_transport->iscsit_get_r2t_ttt)
3054 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3055 else
3056 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3057 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3058 hdr->statsn = cpu_to_be32(conn->stat_sn);
3059 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3060 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3061 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3062 hdr->data_offset = cpu_to_be32(r2t->offset);
3063 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3064
3065 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3066 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3067 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3068 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3069 r2t->offset, r2t->xfer_len, conn->cid);
3070
3071 spin_lock_bh(&cmd->r2t_lock);
3072 r2t->sent_r2t = 1;
3073 spin_unlock_bh(&cmd->r2t_lock);
3074
3075 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3076 if (ret < 0) {
3077 return ret;
3078 }
3079
3080 spin_lock_bh(&cmd->dataout_timeout_lock);
3081 iscsit_start_dataout_timer(cmd, conn);
3082 spin_unlock_bh(&cmd->dataout_timeout_lock);
3083
3084 return 0;
3085 }
3086
3087 /*
3088 * @recovery: If called from iscsi_task_reassign_complete_write() for
3089 * connection recovery.
3090 */
3091 int iscsit_build_r2ts_for_cmd(
3092 struct iscsi_conn *conn,
3093 struct iscsi_cmd *cmd,
3094 bool recovery)
3095 {
3096 int first_r2t = 1;
3097 u32 offset = 0, xfer_len = 0;
3098
3099 spin_lock_bh(&cmd->r2t_lock);
3100 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3101 spin_unlock_bh(&cmd->r2t_lock);
3102 return 0;
3103 }
3104
3105 if (conn->sess->sess_ops->DataSequenceInOrder &&
3106 !recovery)
3107 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3108
3109 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3110 if (conn->sess->sess_ops->DataSequenceInOrder) {
3111 offset = cmd->r2t_offset;
3112
3113 if (first_r2t && recovery) {
3114 int new_data_end = offset +
3115 conn->sess->sess_ops->MaxBurstLength -
3116 cmd->next_burst_len;
3117
3118 if (new_data_end > cmd->se_cmd.data_length)
3119 xfer_len = cmd->se_cmd.data_length - offset;
3120 else
3121 xfer_len =
3122 conn->sess->sess_ops->MaxBurstLength -
3123 cmd->next_burst_len;
3124 } else {
3125 int new_data_end = offset +
3126 conn->sess->sess_ops->MaxBurstLength;
3127
3128 if (new_data_end > cmd->se_cmd.data_length)
3129 xfer_len = cmd->se_cmd.data_length - offset;
3130 else
3131 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3132 }
3133 cmd->r2t_offset += xfer_len;
3134
3135 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3136 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3137 } else {
3138 struct iscsi_seq *seq;
3139
3140 seq = iscsit_get_seq_holder_for_r2t(cmd);
3141 if (!seq) {
3142 spin_unlock_bh(&cmd->r2t_lock);
3143 return -1;
3144 }
3145
3146 offset = seq->offset;
3147 xfer_len = seq->xfer_len;
3148
3149 if (cmd->seq_send_order == cmd->seq_count)
3150 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3151 }
3152 cmd->outstanding_r2ts++;
3153 first_r2t = 0;
3154
3155 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3156 spin_unlock_bh(&cmd->r2t_lock);
3157 return -1;
3158 }
3159
3160 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3161 break;
3162 }
3163 spin_unlock_bh(&cmd->r2t_lock);
3164
3165 return 0;
3166 }
3167 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3168
3169 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3170 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3171 {
3172 if (inc_stat_sn)
3173 cmd->stat_sn = conn->stat_sn++;
3174
3175 atomic_long_inc(&conn->sess->rsp_pdus);
3176
3177 memset(hdr, 0, ISCSI_HDR_LEN);
3178 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3179 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3180 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3181 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3182 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3183 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3184 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3185 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3186 }
3187 hdr->response = cmd->iscsi_response;
3188 hdr->cmd_status = cmd->se_cmd.scsi_status;
3189 hdr->itt = cmd->init_task_tag;
3190 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3191
3192 iscsit_increment_maxcmdsn(cmd, conn->sess);
3193 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3194 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3195
3196 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3197 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3198 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3199 cmd->se_cmd.scsi_status, conn->cid);
3200 }
3201 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3202
3203 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3204 {
3205 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3206 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3207 void *data_buf = NULL;
3208 u32 padding = 0, data_buf_len = 0;
3209
3210 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3211
3212 /*
3213 * Attach SENSE DATA payload to iSCSI Response PDU
3214 */
3215 if (cmd->se_cmd.sense_buffer &&
3216 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3217 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3218 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3219 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3220
3221 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3222 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3223 data_buf = cmd->sense_buffer;
3224 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3225
3226 if (padding) {
3227 memset(cmd->sense_buffer +
3228 cmd->se_cmd.scsi_sense_length, 0, padding);
3229 pr_debug("Adding %u bytes of padding to"
3230 " SENSE.\n", padding);
3231 }
3232
3233 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3234 " Response PDU\n",
3235 cmd->se_cmd.scsi_sense_length);
3236 }
3237
3238 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3239 data_buf_len);
3240 }
3241
3242 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3243 {
3244 switch (se_tmr->response) {
3245 case TMR_FUNCTION_COMPLETE:
3246 return ISCSI_TMF_RSP_COMPLETE;
3247 case TMR_TASK_DOES_NOT_EXIST:
3248 return ISCSI_TMF_RSP_NO_TASK;
3249 case TMR_LUN_DOES_NOT_EXIST:
3250 return ISCSI_TMF_RSP_NO_LUN;
3251 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3252 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3253 case TMR_FUNCTION_REJECTED:
3254 default:
3255 return ISCSI_TMF_RSP_REJECTED;
3256 }
3257 }
3258
3259 void
3260 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3261 struct iscsi_tm_rsp *hdr)
3262 {
3263 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3264
3265 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3266 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3267 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3268 hdr->itt = cmd->init_task_tag;
3269 cmd->stat_sn = conn->stat_sn++;
3270 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3271
3272 iscsit_increment_maxcmdsn(cmd, conn->sess);
3273 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3274 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3275
3276 pr_debug("Built Task Management Response ITT: 0x%08x,"
3277 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3278 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3279 }
3280 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3281
3282 static int
3283 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3284 {
3285 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3286
3287 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3288
3289 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3290 }
3291
3292 #define SENDTARGETS_BUF_LIMIT 32768U
3293
3294 static int
3295 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3296 enum iscsit_transport_type network_transport,
3297 int skip_bytes, bool *completed)
3298 {
3299 char *payload = NULL;
3300 struct iscsi_conn *conn = cmd->conn;
3301 struct iscsi_portal_group *tpg;
3302 struct iscsi_tiqn *tiqn;
3303 struct iscsi_tpg_np *tpg_np;
3304 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3305 int target_name_printed;
3306 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3307 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3308 bool active;
3309
3310 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3311 SENDTARGETS_BUF_LIMIT);
3312
3313 payload = kzalloc(buffer_len, GFP_KERNEL);
3314 if (!payload)
3315 return -ENOMEM;
3316
3317 /*
3318 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3319 * explicit case..
3320 */
3321 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3322 text_ptr = strchr(text_in, '=');
3323 if (!text_ptr) {
3324 pr_err("Unable to locate '=' string in text_in:"
3325 " %s\n", text_in);
3326 kfree(payload);
3327 return -EINVAL;
3328 }
3329 /*
3330 * Skip over '=' character..
3331 */
3332 text_ptr += 1;
3333 }
3334
3335 spin_lock(&tiqn_lock);
3336 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3337 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3338 strcmp(tiqn->tiqn, text_ptr)) {
3339 continue;
3340 }
3341
3342 target_name_printed = 0;
3343
3344 spin_lock(&tiqn->tiqn_tpg_lock);
3345 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3346
3347 /* If demo_mode_discovery=0 and generate_node_acls=0
3348 * (demo mode dislabed) do not return
3349 * TargetName+TargetAddress unless a NodeACL exists.
3350 */
3351
3352 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3353 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3354 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3355 cmd->conn->sess->sess_ops->InitiatorName))) {
3356 continue;
3357 }
3358
3359 spin_lock(&tpg->tpg_state_lock);
3360 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3361 spin_unlock(&tpg->tpg_state_lock);
3362
3363 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3364 continue;
3365
3366 spin_lock(&tpg->tpg_np_lock);
3367 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3368 tpg_np_list) {
3369 struct iscsi_np *np = tpg_np->tpg_np;
3370 struct sockaddr_storage *sockaddr;
3371
3372 if (np->np_network_transport != network_transport)
3373 continue;
3374
3375 if (!target_name_printed) {
3376 len = sprintf(buf, "TargetName=%s",
3377 tiqn->tiqn);
3378 len += 1;
3379
3380 if ((len + payload_len) > buffer_len) {
3381 spin_unlock(&tpg->tpg_np_lock);
3382 spin_unlock(&tiqn->tiqn_tpg_lock);
3383 end_of_buf = 1;
3384 goto eob;
3385 }
3386
3387 if (skip_bytes && len <= skip_bytes) {
3388 skip_bytes -= len;
3389 } else {
3390 memcpy(payload + payload_len, buf, len);
3391 payload_len += len;
3392 target_name_printed = 1;
3393 if (len > skip_bytes)
3394 skip_bytes = 0;
3395 }
3396 }
3397
3398 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3399 sockaddr = &conn->local_sockaddr;
3400 else
3401 sockaddr = &np->np_sockaddr;
3402
3403 len = sprintf(buf, "TargetAddress="
3404 "%pISpc,%hu",
3405 sockaddr,
3406 tpg->tpgt);
3407 len += 1;
3408
3409 if ((len + payload_len) > buffer_len) {
3410 spin_unlock(&tpg->tpg_np_lock);
3411 spin_unlock(&tiqn->tiqn_tpg_lock);
3412 end_of_buf = 1;
3413 goto eob;
3414 }
3415
3416 if (skip_bytes && len <= skip_bytes) {
3417 skip_bytes -= len;
3418 } else {
3419 memcpy(payload + payload_len, buf, len);
3420 payload_len += len;
3421 if (len > skip_bytes)
3422 skip_bytes = 0;
3423 }
3424 }
3425 spin_unlock(&tpg->tpg_np_lock);
3426 }
3427 spin_unlock(&tiqn->tiqn_tpg_lock);
3428 eob:
3429 if (end_of_buf) {
3430 *completed = false;
3431 break;
3432 }
3433
3434 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3435 break;
3436 }
3437 spin_unlock(&tiqn_lock);
3438
3439 cmd->buf_ptr = payload;
3440
3441 return payload_len;
3442 }
3443
3444 int
3445 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3446 struct iscsi_text_rsp *hdr,
3447 enum iscsit_transport_type network_transport)
3448 {
3449 int text_length, padding;
3450 bool completed = true;
3451
3452 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3453 cmd->read_data_done,
3454 &completed);
3455 if (text_length < 0)
3456 return text_length;
3457
3458 if (completed) {
3459 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3460 } else {
3461 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3462 cmd->read_data_done += text_length;
3463 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3464 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3465 }
3466 hdr->opcode = ISCSI_OP_TEXT_RSP;
3467 padding = ((-text_length) & 3);
3468 hton24(hdr->dlength, text_length);
3469 hdr->itt = cmd->init_task_tag;
3470 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3471 cmd->stat_sn = conn->stat_sn++;
3472 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3473
3474 iscsit_increment_maxcmdsn(cmd, conn->sess);
3475 /*
3476 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3477 * correctly increment MaxCmdSN for each response answering a
3478 * non immediate text request with a valid CmdSN.
3479 */
3480 cmd->maxcmdsn_inc = 0;
3481 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3482 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3483
3484 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3485 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3486 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3487 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3488 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3489
3490 return text_length + padding;
3491 }
3492 EXPORT_SYMBOL(iscsit_build_text_rsp);
3493
3494 static int iscsit_send_text_rsp(
3495 struct iscsi_cmd *cmd,
3496 struct iscsi_conn *conn)
3497 {
3498 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3499 int text_length;
3500
3501 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3502 conn->conn_transport->transport_type);
3503 if (text_length < 0)
3504 return text_length;
3505
3506 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3507 cmd->buf_ptr,
3508 text_length);
3509 }
3510
3511 void
3512 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3513 struct iscsi_reject *hdr)
3514 {
3515 hdr->opcode = ISCSI_OP_REJECT;
3516 hdr->reason = cmd->reject_reason;
3517 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3518 hton24(hdr->dlength, ISCSI_HDR_LEN);
3519 hdr->ffffffff = cpu_to_be32(0xffffffff);
3520 cmd->stat_sn = conn->stat_sn++;
3521 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3522 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3523 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3524
3525 }
3526 EXPORT_SYMBOL(iscsit_build_reject);
3527
3528 static int iscsit_send_reject(
3529 struct iscsi_cmd *cmd,
3530 struct iscsi_conn *conn)
3531 {
3532 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3533
3534 iscsit_build_reject(cmd, conn, hdr);
3535
3536 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3537 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3538
3539 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3540 cmd->buf_ptr,
3541 ISCSI_HDR_LEN);
3542 }
3543
3544 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3545 {
3546 int ord, cpu;
3547 /*
3548 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3549 * within iscsit_start_kthreads()
3550 *
3551 * Here we use bitmap_id to determine which CPU that this
3552 * iSCSI connection's RX/TX threads will be scheduled to
3553 * execute upon.
3554 */
3555 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3556 for_each_online_cpu(cpu) {
3557 if (ord-- == 0) {
3558 cpumask_set_cpu(cpu, conn->conn_cpumask);
3559 return;
3560 }
3561 }
3562 /*
3563 * This should never be reached..
3564 */
3565 dump_stack();
3566 cpumask_setall(conn->conn_cpumask);
3567 }
3568
3569 int
3570 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3571 {
3572 int ret;
3573
3574 switch (state) {
3575 case ISTATE_SEND_R2T:
3576 ret = iscsit_send_r2t(cmd, conn);
3577 if (ret < 0)
3578 goto err;
3579 break;
3580 case ISTATE_REMOVE:
3581 spin_lock_bh(&conn->cmd_lock);
3582 list_del_init(&cmd->i_conn_node);
3583 spin_unlock_bh(&conn->cmd_lock);
3584
3585 iscsit_free_cmd(cmd, false);
3586 break;
3587 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3588 iscsit_mod_nopin_response_timer(conn);
3589 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3590 if (ret < 0)
3591 goto err;
3592 break;
3593 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3594 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3595 if (ret < 0)
3596 goto err;
3597 break;
3598 default:
3599 pr_err("Unknown Opcode: 0x%02x ITT:"
3600 " 0x%08x, i_state: %d on CID: %hu\n",
3601 cmd->iscsi_opcode, cmd->init_task_tag, state,
3602 conn->cid);
3603 goto err;
3604 }
3605
3606 return 0;
3607
3608 err:
3609 return -1;
3610 }
3611 EXPORT_SYMBOL(iscsit_immediate_queue);
3612
3613 static int
3614 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3615 {
3616 struct iscsit_transport *t = conn->conn_transport;
3617 struct iscsi_queue_req *qr;
3618 struct iscsi_cmd *cmd;
3619 u8 state;
3620 int ret;
3621
3622 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3623 atomic_set(&conn->check_immediate_queue, 0);
3624 cmd = qr->cmd;
3625 state = qr->state;
3626 kmem_cache_free(lio_qr_cache, qr);
3627
3628 ret = t->iscsit_immediate_queue(conn, cmd, state);
3629 if (ret < 0)
3630 return ret;
3631 }
3632
3633 return 0;
3634 }
3635
3636 int
3637 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3638 {
3639 int ret;
3640
3641 check_rsp_state:
3642 switch (state) {
3643 case ISTATE_SEND_DATAIN:
3644 ret = iscsit_send_datain(cmd, conn);
3645 if (ret < 0)
3646 goto err;
3647 else if (!ret)
3648 /* more drs */
3649 goto check_rsp_state;
3650 else if (ret == 1) {
3651 /* all done */
3652 spin_lock_bh(&cmd->istate_lock);
3653 cmd->i_state = ISTATE_SENT_STATUS;
3654 spin_unlock_bh(&cmd->istate_lock);
3655
3656 if (atomic_read(&conn->check_immediate_queue))
3657 return 1;
3658
3659 return 0;
3660 } else if (ret == 2) {
3661 /* Still must send status,
3662 SCF_TRANSPORT_TASK_SENSE was set */
3663 spin_lock_bh(&cmd->istate_lock);
3664 cmd->i_state = ISTATE_SEND_STATUS;
3665 spin_unlock_bh(&cmd->istate_lock);
3666 state = ISTATE_SEND_STATUS;
3667 goto check_rsp_state;
3668 }
3669
3670 break;
3671 case ISTATE_SEND_STATUS:
3672 case ISTATE_SEND_STATUS_RECOVERY:
3673 ret = iscsit_send_response(cmd, conn);
3674 break;
3675 case ISTATE_SEND_LOGOUTRSP:
3676 ret = iscsit_send_logout(cmd, conn);
3677 break;
3678 case ISTATE_SEND_ASYNCMSG:
3679 ret = iscsit_send_conn_drop_async_message(
3680 cmd, conn);
3681 break;
3682 case ISTATE_SEND_NOPIN:
3683 ret = iscsit_send_nopin(cmd, conn);
3684 break;
3685 case ISTATE_SEND_REJECT:
3686 ret = iscsit_send_reject(cmd, conn);
3687 break;
3688 case ISTATE_SEND_TASKMGTRSP:
3689 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3690 if (ret != 0)
3691 break;
3692 ret = iscsit_tmr_post_handler(cmd, conn);
3693 if (ret != 0)
3694 iscsit_fall_back_to_erl0(conn->sess);
3695 break;
3696 case ISTATE_SEND_TEXTRSP:
3697 ret = iscsit_send_text_rsp(cmd, conn);
3698 break;
3699 default:
3700 pr_err("Unknown Opcode: 0x%02x ITT:"
3701 " 0x%08x, i_state: %d on CID: %hu\n",
3702 cmd->iscsi_opcode, cmd->init_task_tag,
3703 state, conn->cid);
3704 goto err;
3705 }
3706 if (ret < 0)
3707 goto err;
3708
3709 switch (state) {
3710 case ISTATE_SEND_LOGOUTRSP:
3711 if (!iscsit_logout_post_handler(cmd, conn))
3712 return -ECONNRESET;
3713 /* fall through */
3714 case ISTATE_SEND_STATUS:
3715 case ISTATE_SEND_ASYNCMSG:
3716 case ISTATE_SEND_NOPIN:
3717 case ISTATE_SEND_STATUS_RECOVERY:
3718 case ISTATE_SEND_TEXTRSP:
3719 case ISTATE_SEND_TASKMGTRSP:
3720 case ISTATE_SEND_REJECT:
3721 spin_lock_bh(&cmd->istate_lock);
3722 cmd->i_state = ISTATE_SENT_STATUS;
3723 spin_unlock_bh(&cmd->istate_lock);
3724 break;
3725 default:
3726 pr_err("Unknown Opcode: 0x%02x ITT:"
3727 " 0x%08x, i_state: %d on CID: %hu\n",
3728 cmd->iscsi_opcode, cmd->init_task_tag,
3729 cmd->i_state, conn->cid);
3730 goto err;
3731 }
3732
3733 if (atomic_read(&conn->check_immediate_queue))
3734 return 1;
3735
3736 return 0;
3737
3738 err:
3739 return -1;
3740 }
3741 EXPORT_SYMBOL(iscsit_response_queue);
3742
3743 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3744 {
3745 struct iscsit_transport *t = conn->conn_transport;
3746 struct iscsi_queue_req *qr;
3747 struct iscsi_cmd *cmd;
3748 u8 state;
3749 int ret;
3750
3751 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3752 cmd = qr->cmd;
3753 state = qr->state;
3754 kmem_cache_free(lio_qr_cache, qr);
3755
3756 ret = t->iscsit_response_queue(conn, cmd, state);
3757 if (ret == 1 || ret < 0)
3758 return ret;
3759 }
3760
3761 return 0;
3762 }
3763
3764 int iscsi_target_tx_thread(void *arg)
3765 {
3766 int ret = 0;
3767 struct iscsi_conn *conn = arg;
3768 bool conn_freed = false;
3769
3770 /*
3771 * Allow ourselves to be interrupted by SIGINT so that a
3772 * connection recovery / failure event can be triggered externally.
3773 */
3774 allow_signal(SIGINT);
3775
3776 while (!kthread_should_stop()) {
3777 /*
3778 * Ensure that both TX and RX per connection kthreads
3779 * are scheduled to run on the same CPU.
3780 */
3781 iscsit_thread_check_cpumask(conn, current, 1);
3782
3783 wait_event_interruptible(conn->queues_wq,
3784 !iscsit_conn_all_queues_empty(conn));
3785
3786 if (signal_pending(current))
3787 goto transport_err;
3788
3789 get_immediate:
3790 ret = iscsit_handle_immediate_queue(conn);
3791 if (ret < 0)
3792 goto transport_err;
3793
3794 ret = iscsit_handle_response_queue(conn);
3795 if (ret == 1) {
3796 goto get_immediate;
3797 } else if (ret == -ECONNRESET) {
3798 conn_freed = true;
3799 goto out;
3800 } else if (ret < 0) {
3801 goto transport_err;
3802 }
3803 }
3804
3805 transport_err:
3806 /*
3807 * Avoid the normal connection failure code-path if this connection
3808 * is still within LOGIN mode, and iscsi_np process context is
3809 * responsible for cleaning up the early connection failure.
3810 */
3811 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3812 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3813 out:
3814 if (!conn_freed) {
3815 while (!kthread_should_stop()) {
3816 msleep(100);
3817 }
3818 }
3819 return 0;
3820 }
3821
3822 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3823 {
3824 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3825 struct iscsi_cmd *cmd;
3826 int ret = 0;
3827
3828 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3829 case ISCSI_OP_SCSI_CMD:
3830 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3831 if (!cmd)
3832 goto reject;
3833
3834 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3835 break;
3836 case ISCSI_OP_SCSI_DATA_OUT:
3837 ret = iscsit_handle_data_out(conn, buf);
3838 break;
3839 case ISCSI_OP_NOOP_OUT:
3840 cmd = NULL;
3841 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3842 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3843 if (!cmd)
3844 goto reject;
3845 }
3846 ret = iscsit_handle_nop_out(conn, cmd, buf);
3847 break;
3848 case ISCSI_OP_SCSI_TMFUNC:
3849 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3850 if (!cmd)
3851 goto reject;
3852
3853 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3854 break;
3855 case ISCSI_OP_TEXT:
3856 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3857 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3858 if (!cmd)
3859 goto reject;
3860 } else {
3861 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3862 if (!cmd)
3863 goto reject;
3864 }
3865
3866 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3867 break;
3868 case ISCSI_OP_LOGOUT:
3869 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3870 if (!cmd)
3871 goto reject;
3872
3873 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3874 if (ret > 0)
3875 wait_for_completion_timeout(&conn->conn_logout_comp,
3876 SECONDS_FOR_LOGOUT_COMP * HZ);
3877 break;
3878 case ISCSI_OP_SNACK:
3879 ret = iscsit_handle_snack(conn, buf);
3880 break;
3881 default:
3882 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3883 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3884 pr_err("Cannot recover from unknown"
3885 " opcode while ERL=0, closing iSCSI connection.\n");
3886 return -1;
3887 }
3888 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3889 " closing iSCSI connection.\n");
3890 ret = -1;
3891 break;
3892 }
3893
3894 return ret;
3895 reject:
3896 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3897 }
3898
3899 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3900 {
3901 bool ret;
3902
3903 spin_lock_bh(&conn->state_lock);
3904 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3905 spin_unlock_bh(&conn->state_lock);
3906
3907 return ret;
3908 }
3909
3910 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3911 {
3912 int ret;
3913 u8 buffer[ISCSI_HDR_LEN], opcode;
3914 u32 checksum = 0, digest = 0;
3915 struct kvec iov;
3916
3917 while (!kthread_should_stop()) {
3918 /*
3919 * Ensure that both TX and RX per connection kthreads
3920 * are scheduled to run on the same CPU.
3921 */
3922 iscsit_thread_check_cpumask(conn, current, 0);
3923
3924 memset(buffer, 0, ISCSI_HDR_LEN);
3925 memset(&iov, 0, sizeof(struct kvec));
3926
3927 iov.iov_base = buffer;
3928 iov.iov_len = ISCSI_HDR_LEN;
3929
3930 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3931 if (ret != ISCSI_HDR_LEN) {
3932 iscsit_rx_thread_wait_for_tcp(conn);
3933 return;
3934 }
3935
3936 if (conn->conn_ops->HeaderDigest) {
3937 iov.iov_base = &digest;
3938 iov.iov_len = ISCSI_CRC_LEN;
3939
3940 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3941 if (ret != ISCSI_CRC_LEN) {
3942 iscsit_rx_thread_wait_for_tcp(conn);
3943 return;
3944 }
3945
3946 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3947 ISCSI_HDR_LEN, 0, NULL,
3948 &checksum);
3949
3950 if (digest != checksum) {
3951 pr_err("HeaderDigest CRC32C failed,"
3952 " received 0x%08x, computed 0x%08x\n",
3953 digest, checksum);
3954 /*
3955 * Set the PDU to 0xff so it will intentionally
3956 * hit default in the switch below.
3957 */
3958 memset(buffer, 0xff, ISCSI_HDR_LEN);
3959 atomic_long_inc(&conn->sess->conn_digest_errors);
3960 } else {
3961 pr_debug("Got HeaderDigest CRC32C"
3962 " 0x%08x\n", checksum);
3963 }
3964 }
3965
3966 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3967 return;
3968
3969 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3970
3971 if (conn->sess->sess_ops->SessionType &&
3972 ((!(opcode & ISCSI_OP_TEXT)) ||
3973 (!(opcode & ISCSI_OP_LOGOUT)))) {
3974 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3975 " while in Discovery Session, rejecting.\n", opcode);
3976 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
3977 buffer);
3978 return;
3979 }
3980
3981 ret = iscsi_target_rx_opcode(conn, buffer);
3982 if (ret < 0)
3983 return;
3984 }
3985 }
3986
3987 int iscsi_target_rx_thread(void *arg)
3988 {
3989 int rc;
3990 struct iscsi_conn *conn = arg;
3991 bool conn_freed = false;
3992
3993 /*
3994 * Allow ourselves to be interrupted by SIGINT so that a
3995 * connection recovery / failure event can be triggered externally.
3996 */
3997 allow_signal(SIGINT);
3998 /*
3999 * Wait for iscsi_post_login_handler() to complete before allowing
4000 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4001 */
4002 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4003 if (rc < 0 || iscsi_target_check_conn_state(conn))
4004 goto out;
4005
4006 if (!conn->conn_transport->iscsit_get_rx_pdu)
4007 return 0;
4008
4009 conn->conn_transport->iscsit_get_rx_pdu(conn);
4010
4011 if (!signal_pending(current))
4012 atomic_set(&conn->transport_failed, 1);
4013 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4014
4015 out:
4016 if (!conn_freed) {
4017 while (!kthread_should_stop()) {
4018 msleep(100);
4019 }
4020 }
4021
4022 return 0;
4023 }
4024
4025 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4026 {
4027 LIST_HEAD(tmp_list);
4028 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4029 struct iscsi_session *sess = conn->sess;
4030 /*
4031 * We expect this function to only ever be called from either RX or TX
4032 * thread context via iscsit_close_connection() once the other context
4033 * has been reset -> returned sleeping pre-handler state.
4034 */
4035 spin_lock_bh(&conn->cmd_lock);
4036 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4037
4038 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4039 struct se_cmd *se_cmd = &cmd->se_cmd;
4040
4041 if (se_cmd->se_tfo != NULL) {
4042 spin_lock(&se_cmd->t_state_lock);
4043 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4044 spin_unlock(&se_cmd->t_state_lock);
4045 }
4046 }
4047 spin_unlock_bh(&conn->cmd_lock);
4048
4049 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4050 list_del_init(&cmd->i_conn_node);
4051
4052 iscsit_increment_maxcmdsn(cmd, sess);
4053 iscsit_free_cmd(cmd, true);
4054
4055 }
4056 }
4057
4058 static void iscsit_stop_timers_for_cmds(
4059 struct iscsi_conn *conn)
4060 {
4061 struct iscsi_cmd *cmd;
4062
4063 spin_lock_bh(&conn->cmd_lock);
4064 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4065 if (cmd->data_direction == DMA_TO_DEVICE)
4066 iscsit_stop_dataout_timer(cmd);
4067 }
4068 spin_unlock_bh(&conn->cmd_lock);
4069 }
4070
4071 int iscsit_close_connection(
4072 struct iscsi_conn *conn)
4073 {
4074 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4075 struct iscsi_session *sess = conn->sess;
4076
4077 pr_debug("Closing iSCSI connection CID %hu on SID:"
4078 " %u\n", conn->cid, sess->sid);
4079 /*
4080 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4081 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4082 * sleeping and the logout response never got sent because the
4083 * connection failed.
4084 *
4085 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4086 * to signal logout response TX interrupt completion. Go ahead and skip
4087 * this for iser since isert_rx_opcode() does not wait on logout failure,
4088 * and to avoid iscsi_conn pointer dereference in iser-target code.
4089 */
4090 if (!conn->conn_transport->rdma_shutdown)
4091 complete(&conn->conn_logout_comp);
4092
4093 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4094 if (conn->tx_thread &&
4095 cmpxchg(&conn->tx_thread_active, true, false)) {
4096 send_sig(SIGINT, conn->tx_thread, 1);
4097 kthread_stop(conn->tx_thread);
4098 }
4099 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4100 if (conn->rx_thread &&
4101 cmpxchg(&conn->rx_thread_active, true, false)) {
4102 send_sig(SIGINT, conn->rx_thread, 1);
4103 kthread_stop(conn->rx_thread);
4104 }
4105 }
4106
4107 spin_lock(&iscsit_global->ts_bitmap_lock);
4108 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4109 get_order(1));
4110 spin_unlock(&iscsit_global->ts_bitmap_lock);
4111
4112 iscsit_stop_timers_for_cmds(conn);
4113 iscsit_stop_nopin_response_timer(conn);
4114 iscsit_stop_nopin_timer(conn);
4115
4116 if (conn->conn_transport->iscsit_wait_conn)
4117 conn->conn_transport->iscsit_wait_conn(conn);
4118
4119 /*
4120 * During Connection recovery drop unacknowledged out of order
4121 * commands for this connection, and prepare the other commands
4122 * for reallegiance.
4123 *
4124 * During normal operation clear the out of order commands (but
4125 * do not free the struct iscsi_ooo_cmdsn's) and release all
4126 * struct iscsi_cmds.
4127 */
4128 if (atomic_read(&conn->connection_recovery)) {
4129 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4130 iscsit_prepare_cmds_for_reallegiance(conn);
4131 } else {
4132 iscsit_clear_ooo_cmdsns_for_conn(conn);
4133 iscsit_release_commands_from_conn(conn);
4134 }
4135 iscsit_free_queue_reqs_for_conn(conn);
4136
4137 /*
4138 * Handle decrementing session or connection usage count if
4139 * a logout response was not able to be sent because the
4140 * connection failed. Fall back to Session Recovery here.
4141 */
4142 if (atomic_read(&conn->conn_logout_remove)) {
4143 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4144 iscsit_dec_conn_usage_count(conn);
4145 iscsit_dec_session_usage_count(sess);
4146 }
4147 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4148 iscsit_dec_conn_usage_count(conn);
4149
4150 atomic_set(&conn->conn_logout_remove, 0);
4151 atomic_set(&sess->session_reinstatement, 0);
4152 atomic_set(&sess->session_fall_back_to_erl0, 1);
4153 }
4154
4155 spin_lock_bh(&sess->conn_lock);
4156 list_del(&conn->conn_list);
4157
4158 /*
4159 * Attempt to let the Initiator know this connection failed by
4160 * sending an Connection Dropped Async Message on another
4161 * active connection.
4162 */
4163 if (atomic_read(&conn->connection_recovery))
4164 iscsit_build_conn_drop_async_message(conn);
4165
4166 spin_unlock_bh(&sess->conn_lock);
4167
4168 /*
4169 * If connection reinstatement is being performed on this connection,
4170 * up the connection reinstatement semaphore that is being blocked on
4171 * in iscsit_cause_connection_reinstatement().
4172 */
4173 spin_lock_bh(&conn->state_lock);
4174 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4175 spin_unlock_bh(&conn->state_lock);
4176 complete(&conn->conn_wait_comp);
4177 wait_for_completion(&conn->conn_post_wait_comp);
4178 spin_lock_bh(&conn->state_lock);
4179 }
4180
4181 /*
4182 * If connection reinstatement is being performed on this connection
4183 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4184 * connection wait rcfr semaphore that is being blocked on
4185 * an iscsit_connection_reinstatement_rcfr().
4186 */
4187 if (atomic_read(&conn->connection_wait_rcfr)) {
4188 spin_unlock_bh(&conn->state_lock);
4189 complete(&conn->conn_wait_rcfr_comp);
4190 wait_for_completion(&conn->conn_post_wait_comp);
4191 spin_lock_bh(&conn->state_lock);
4192 }
4193 atomic_set(&conn->connection_reinstatement, 1);
4194 spin_unlock_bh(&conn->state_lock);
4195
4196 /*
4197 * If any other processes are accessing this connection pointer we
4198 * must wait until they have completed.
4199 */
4200 iscsit_check_conn_usage_count(conn);
4201
4202 ahash_request_free(conn->conn_tx_hash);
4203 if (conn->conn_rx_hash) {
4204 struct crypto_ahash *tfm;
4205
4206 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4207 ahash_request_free(conn->conn_rx_hash);
4208 crypto_free_ahash(tfm);
4209 }
4210
4211 free_cpumask_var(conn->conn_cpumask);
4212
4213 kfree(conn->conn_ops);
4214 conn->conn_ops = NULL;
4215
4216 if (conn->sock)
4217 sock_release(conn->sock);
4218
4219 if (conn->conn_transport->iscsit_free_conn)
4220 conn->conn_transport->iscsit_free_conn(conn);
4221
4222 iscsit_put_transport(conn->conn_transport);
4223
4224 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4225 conn->conn_state = TARG_CONN_STATE_FREE;
4226 kfree(conn);
4227
4228 spin_lock_bh(&sess->conn_lock);
4229 atomic_dec(&sess->nconn);
4230 pr_debug("Decremented iSCSI connection count to %hu from node:"
4231 " %s\n", atomic_read(&sess->nconn),
4232 sess->sess_ops->InitiatorName);
4233 /*
4234 * Make sure that if one connection fails in an non ERL=2 iSCSI
4235 * Session that they all fail.
4236 */
4237 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4238 !atomic_read(&sess->session_logout))
4239 atomic_set(&sess->session_fall_back_to_erl0, 1);
4240
4241 /*
4242 * If this was not the last connection in the session, and we are
4243 * performing session reinstatement or falling back to ERL=0, call
4244 * iscsit_stop_session() without sleeping to shutdown the other
4245 * active connections.
4246 */
4247 if (atomic_read(&sess->nconn)) {
4248 if (!atomic_read(&sess->session_reinstatement) &&
4249 !atomic_read(&sess->session_fall_back_to_erl0)) {
4250 spin_unlock_bh(&sess->conn_lock);
4251 return 0;
4252 }
4253 if (!atomic_read(&sess->session_stop_active)) {
4254 atomic_set(&sess->session_stop_active, 1);
4255 spin_unlock_bh(&sess->conn_lock);
4256 iscsit_stop_session(sess, 0, 0);
4257 return 0;
4258 }
4259 spin_unlock_bh(&sess->conn_lock);
4260 return 0;
4261 }
4262
4263 /*
4264 * If this was the last connection in the session and one of the
4265 * following is occurring:
4266 *
4267 * Session Reinstatement is not being performed, and are falling back
4268 * to ERL=0 call iscsit_close_session().
4269 *
4270 * Session Logout was requested. iscsit_close_session() will be called
4271 * elsewhere.
4272 *
4273 * Session Continuation is not being performed, start the Time2Retain
4274 * handler and check if sleep_on_sess_wait_sem is active.
4275 */
4276 if (!atomic_read(&sess->session_reinstatement) &&
4277 atomic_read(&sess->session_fall_back_to_erl0)) {
4278 spin_unlock_bh(&sess->conn_lock);
4279 iscsit_close_session(sess);
4280
4281 return 0;
4282 } else if (atomic_read(&sess->session_logout)) {
4283 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4284 sess->session_state = TARG_SESS_STATE_FREE;
4285 spin_unlock_bh(&sess->conn_lock);
4286
4287 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4288 complete(&sess->session_wait_comp);
4289
4290 return 0;
4291 } else {
4292 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4293 sess->session_state = TARG_SESS_STATE_FAILED;
4294
4295 if (!atomic_read(&sess->session_continuation)) {
4296 spin_unlock_bh(&sess->conn_lock);
4297 iscsit_start_time2retain_handler(sess);
4298 } else
4299 spin_unlock_bh(&sess->conn_lock);
4300
4301 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4302 complete(&sess->session_wait_comp);
4303
4304 return 0;
4305 }
4306 }
4307
4308 /*
4309 * If the iSCSI Session for the iSCSI Initiator Node exists,
4310 * forcefully shutdown the iSCSI NEXUS.
4311 */
4312 int iscsit_close_session(struct iscsi_session *sess)
4313 {
4314 struct iscsi_portal_group *tpg = sess->tpg;
4315 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4316
4317 if (atomic_read(&sess->nconn)) {
4318 pr_err("%d connection(s) still exist for iSCSI session"
4319 " to %s\n", atomic_read(&sess->nconn),
4320 sess->sess_ops->InitiatorName);
4321 BUG();
4322 }
4323
4324 spin_lock_bh(&se_tpg->session_lock);
4325 atomic_set(&sess->session_logout, 1);
4326 atomic_set(&sess->session_reinstatement, 1);
4327 iscsit_stop_time2retain_timer(sess);
4328 spin_unlock_bh(&se_tpg->session_lock);
4329
4330 /*
4331 * transport_deregister_session_configfs() will clear the
4332 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4333 * can be setting it again with __transport_register_session() in
4334 * iscsi_post_login_handler() again after the iscsit_stop_session()
4335 * completes in iscsi_np context.
4336 */
4337 transport_deregister_session_configfs(sess->se_sess);
4338
4339 /*
4340 * If any other processes are accessing this session pointer we must
4341 * wait until they have completed. If we are in an interrupt (the
4342 * time2retain handler) and contain and active session usage count we
4343 * restart the timer and exit.
4344 */
4345 if (!in_interrupt()) {
4346 if (iscsit_check_session_usage_count(sess) == 1)
4347 iscsit_stop_session(sess, 1, 1);
4348 } else {
4349 if (iscsit_check_session_usage_count(sess) == 2) {
4350 atomic_set(&sess->session_logout, 0);
4351 iscsit_start_time2retain_handler(sess);
4352 return 0;
4353 }
4354 }
4355
4356 transport_deregister_session(sess->se_sess);
4357
4358 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4359 iscsit_free_connection_recovery_entires(sess);
4360
4361 iscsit_free_all_ooo_cmdsns(sess);
4362
4363 spin_lock_bh(&se_tpg->session_lock);
4364 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4365 sess->session_state = TARG_SESS_STATE_FREE;
4366 pr_debug("Released iSCSI session from node: %s\n",
4367 sess->sess_ops->InitiatorName);
4368 tpg->nsessions--;
4369 if (tpg->tpg_tiqn)
4370 tpg->tpg_tiqn->tiqn_nsessions--;
4371
4372 pr_debug("Decremented number of active iSCSI Sessions on"
4373 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4374
4375 ida_free(&sess_ida, sess->session_index);
4376 kfree(sess->sess_ops);
4377 sess->sess_ops = NULL;
4378 spin_unlock_bh(&se_tpg->session_lock);
4379
4380 kfree(sess);
4381 return 0;
4382 }
4383
4384 static void iscsit_logout_post_handler_closesession(
4385 struct iscsi_conn *conn)
4386 {
4387 struct iscsi_session *sess = conn->sess;
4388 int sleep = 1;
4389 /*
4390 * Traditional iscsi/tcp will invoke this logic from TX thread
4391 * context during session logout, so clear tx_thread_active and
4392 * sleep if iscsit_close_connection() has not already occured.
4393 *
4394 * Since iser-target invokes this logic from it's own workqueue,
4395 * always sleep waiting for RX/TX thread shutdown to complete
4396 * within iscsit_close_connection().
4397 */
4398 if (!conn->conn_transport->rdma_shutdown) {
4399 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4400 if (!sleep)
4401 return;
4402 }
4403
4404 atomic_set(&conn->conn_logout_remove, 0);
4405 complete(&conn->conn_logout_comp);
4406
4407 iscsit_dec_conn_usage_count(conn);
4408 iscsit_stop_session(sess, sleep, sleep);
4409 iscsit_dec_session_usage_count(sess);
4410 iscsit_close_session(sess);
4411 }
4412
4413 static void iscsit_logout_post_handler_samecid(
4414 struct iscsi_conn *conn)
4415 {
4416 int sleep = 1;
4417
4418 if (!conn->conn_transport->rdma_shutdown) {
4419 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4420 if (!sleep)
4421 return;
4422 }
4423
4424 atomic_set(&conn->conn_logout_remove, 0);
4425 complete(&conn->conn_logout_comp);
4426
4427 iscsit_cause_connection_reinstatement(conn, sleep);
4428 iscsit_dec_conn_usage_count(conn);
4429 }
4430
4431 static void iscsit_logout_post_handler_diffcid(
4432 struct iscsi_conn *conn,
4433 u16 cid)
4434 {
4435 struct iscsi_conn *l_conn;
4436 struct iscsi_session *sess = conn->sess;
4437 bool conn_found = false;
4438
4439 if (!sess)
4440 return;
4441
4442 spin_lock_bh(&sess->conn_lock);
4443 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4444 if (l_conn->cid == cid) {
4445 iscsit_inc_conn_usage_count(l_conn);
4446 conn_found = true;
4447 break;
4448 }
4449 }
4450 spin_unlock_bh(&sess->conn_lock);
4451
4452 if (!conn_found)
4453 return;
4454
4455 if (l_conn->sock)
4456 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4457
4458 spin_lock_bh(&l_conn->state_lock);
4459 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4460 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4461 spin_unlock_bh(&l_conn->state_lock);
4462
4463 iscsit_cause_connection_reinstatement(l_conn, 1);
4464 iscsit_dec_conn_usage_count(l_conn);
4465 }
4466
4467 /*
4468 * Return of 0 causes the TX thread to restart.
4469 */
4470 int iscsit_logout_post_handler(
4471 struct iscsi_cmd *cmd,
4472 struct iscsi_conn *conn)
4473 {
4474 int ret = 0;
4475
4476 switch (cmd->logout_reason) {
4477 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4478 switch (cmd->logout_response) {
4479 case ISCSI_LOGOUT_SUCCESS:
4480 case ISCSI_LOGOUT_CLEANUP_FAILED:
4481 default:
4482 iscsit_logout_post_handler_closesession(conn);
4483 break;
4484 }
4485 ret = 0;
4486 break;
4487 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4488 if (conn->cid == cmd->logout_cid) {
4489 switch (cmd->logout_response) {
4490 case ISCSI_LOGOUT_SUCCESS:
4491 case ISCSI_LOGOUT_CLEANUP_FAILED:
4492 default:
4493 iscsit_logout_post_handler_samecid(conn);
4494 break;
4495 }
4496 ret = 0;
4497 } else {
4498 switch (cmd->logout_response) {
4499 case ISCSI_LOGOUT_SUCCESS:
4500 iscsit_logout_post_handler_diffcid(conn,
4501 cmd->logout_cid);
4502 break;
4503 case ISCSI_LOGOUT_CID_NOT_FOUND:
4504 case ISCSI_LOGOUT_CLEANUP_FAILED:
4505 default:
4506 break;
4507 }
4508 ret = 1;
4509 }
4510 break;
4511 case ISCSI_LOGOUT_REASON_RECOVERY:
4512 switch (cmd->logout_response) {
4513 case ISCSI_LOGOUT_SUCCESS:
4514 case ISCSI_LOGOUT_CID_NOT_FOUND:
4515 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4516 case ISCSI_LOGOUT_CLEANUP_FAILED:
4517 default:
4518 break;
4519 }
4520 ret = 1;
4521 break;
4522 default:
4523 break;
4524
4525 }
4526 return ret;
4527 }
4528 EXPORT_SYMBOL(iscsit_logout_post_handler);
4529
4530 void iscsit_fail_session(struct iscsi_session *sess)
4531 {
4532 struct iscsi_conn *conn;
4533
4534 spin_lock_bh(&sess->conn_lock);
4535 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4536 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4537 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4538 }
4539 spin_unlock_bh(&sess->conn_lock);
4540
4541 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4542 sess->session_state = TARG_SESS_STATE_FAILED;
4543 }
4544
4545 int iscsit_free_session(struct iscsi_session *sess)
4546 {
4547 u16 conn_count = atomic_read(&sess->nconn);
4548 struct iscsi_conn *conn, *conn_tmp = NULL;
4549 int is_last;
4550
4551 spin_lock_bh(&sess->conn_lock);
4552 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4553
4554 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4555 conn_list) {
4556 if (conn_count == 0)
4557 break;
4558
4559 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4560 is_last = 1;
4561 } else {
4562 iscsit_inc_conn_usage_count(conn_tmp);
4563 is_last = 0;
4564 }
4565 iscsit_inc_conn_usage_count(conn);
4566
4567 spin_unlock_bh(&sess->conn_lock);
4568 iscsit_cause_connection_reinstatement(conn, 1);
4569 spin_lock_bh(&sess->conn_lock);
4570
4571 iscsit_dec_conn_usage_count(conn);
4572 if (is_last == 0)
4573 iscsit_dec_conn_usage_count(conn_tmp);
4574
4575 conn_count--;
4576 }
4577
4578 if (atomic_read(&sess->nconn)) {
4579 spin_unlock_bh(&sess->conn_lock);
4580 wait_for_completion(&sess->session_wait_comp);
4581 } else
4582 spin_unlock_bh(&sess->conn_lock);
4583
4584 iscsit_close_session(sess);
4585 return 0;
4586 }
4587
4588 void iscsit_stop_session(
4589 struct iscsi_session *sess,
4590 int session_sleep,
4591 int connection_sleep)
4592 {
4593 u16 conn_count = atomic_read(&sess->nconn);
4594 struct iscsi_conn *conn, *conn_tmp = NULL;
4595 int is_last;
4596
4597 spin_lock_bh(&sess->conn_lock);
4598 if (session_sleep)
4599 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4600
4601 if (connection_sleep) {
4602 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4603 conn_list) {
4604 if (conn_count == 0)
4605 break;
4606
4607 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4608 is_last = 1;
4609 } else {
4610 iscsit_inc_conn_usage_count(conn_tmp);
4611 is_last = 0;
4612 }
4613 iscsit_inc_conn_usage_count(conn);
4614
4615 spin_unlock_bh(&sess->conn_lock);
4616 iscsit_cause_connection_reinstatement(conn, 1);
4617 spin_lock_bh(&sess->conn_lock);
4618
4619 iscsit_dec_conn_usage_count(conn);
4620 if (is_last == 0)
4621 iscsit_dec_conn_usage_count(conn_tmp);
4622 conn_count--;
4623 }
4624 } else {
4625 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4626 iscsit_cause_connection_reinstatement(conn, 0);
4627 }
4628
4629 if (session_sleep && atomic_read(&sess->nconn)) {
4630 spin_unlock_bh(&sess->conn_lock);
4631 wait_for_completion(&sess->session_wait_comp);
4632 } else
4633 spin_unlock_bh(&sess->conn_lock);
4634 }
4635
4636 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4637 {
4638 struct iscsi_session *sess;
4639 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4640 struct se_session *se_sess, *se_sess_tmp;
4641 LIST_HEAD(free_list);
4642 int session_count = 0;
4643
4644 spin_lock_bh(&se_tpg->session_lock);
4645 if (tpg->nsessions && !force) {
4646 spin_unlock_bh(&se_tpg->session_lock);
4647 return -1;
4648 }
4649
4650 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4651 sess_list) {
4652 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4653
4654 spin_lock(&sess->conn_lock);
4655 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4656 atomic_read(&sess->session_logout) ||
4657 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4658 spin_unlock(&sess->conn_lock);
4659 continue;
4660 }
4661 atomic_set(&sess->session_reinstatement, 1);
4662 atomic_set(&sess->session_fall_back_to_erl0, 1);
4663 spin_unlock(&sess->conn_lock);
4664
4665 list_move_tail(&se_sess->sess_list, &free_list);
4666 }
4667 spin_unlock_bh(&se_tpg->session_lock);
4668
4669 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4670 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4671
4672 iscsit_free_session(sess);
4673 session_count++;
4674 }
4675
4676 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4677 " Group: %hu\n", session_count, tpg->tpgt);
4678 return 0;
4679 }
4680
4681 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4682 MODULE_VERSION("4.1.x");
4683 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4684 MODULE_LICENSE("GPL");
4685
4686 module_init(iscsi_target_init_module);
4687 module_exit(iscsi_target_cleanup_module);
Linux with added FPC-III support