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[mirror_ubuntu-artful-kernel.git] / drivers / target / iscsi / iscsi_target.c
1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19 #include <crypto/hash.h>
20 #include <linux/string.h>
21 #include <linux/kthread.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
25 #include <linux/idr.h>
26 #include <linux/delay.h>
27 #include <linux/sched/signal.h>
28 #include <asm/unaligned.h>
29 #include <net/ipv6.h>
30 #include <scsi/scsi_proto.h>
31 #include <scsi/iscsi_proto.h>
32 #include <scsi/scsi_tcq.h>
33 #include <target/target_core_base.h>
34 #include <target/target_core_fabric.h>
35
36 #include <target/iscsi/iscsi_target_core.h>
37 #include "iscsi_target_parameters.h"
38 #include "iscsi_target_seq_pdu_list.h"
39 #include "iscsi_target_datain_values.h"
40 #include "iscsi_target_erl0.h"
41 #include "iscsi_target_erl1.h"
42 #include "iscsi_target_erl2.h"
43 #include "iscsi_target_login.h"
44 #include "iscsi_target_tmr.h"
45 #include "iscsi_target_tpg.h"
46 #include "iscsi_target_util.h"
47 #include "iscsi_target.h"
48 #include "iscsi_target_device.h"
49 #include <target/iscsi/iscsi_target_stat.h>
50
51 #include <target/iscsi/iscsi_transport.h>
52
53 static LIST_HEAD(g_tiqn_list);
54 static LIST_HEAD(g_np_list);
55 static DEFINE_SPINLOCK(tiqn_lock);
56 static DEFINE_MUTEX(np_lock);
57
58 static struct idr tiqn_idr;
59 struct idr sess_idr;
60 struct mutex auth_id_lock;
61 spinlock_t sess_idr_lock;
62
63 struct iscsit_global *iscsit_global;
64
65 struct kmem_cache *lio_qr_cache;
66 struct kmem_cache *lio_dr_cache;
67 struct kmem_cache *lio_ooo_cache;
68 struct kmem_cache *lio_r2t_cache;
69
70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
71 struct iscsi_scsi_req *, u32);
72
73 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
74 {
75 struct iscsi_tiqn *tiqn = NULL;
76
77 spin_lock(&tiqn_lock);
78 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
79 if (!strcmp(tiqn->tiqn, buf)) {
80
81 spin_lock(&tiqn->tiqn_state_lock);
82 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
83 tiqn->tiqn_access_count++;
84 spin_unlock(&tiqn->tiqn_state_lock);
85 spin_unlock(&tiqn_lock);
86 return tiqn;
87 }
88 spin_unlock(&tiqn->tiqn_state_lock);
89 }
90 }
91 spin_unlock(&tiqn_lock);
92
93 return NULL;
94 }
95
96 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
97 {
98 spin_lock(&tiqn->tiqn_state_lock);
99 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
100 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
101 spin_unlock(&tiqn->tiqn_state_lock);
102 return 0;
103 }
104 spin_unlock(&tiqn->tiqn_state_lock);
105
106 return -1;
107 }
108
109 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
110 {
111 spin_lock(&tiqn->tiqn_state_lock);
112 tiqn->tiqn_access_count--;
113 spin_unlock(&tiqn->tiqn_state_lock);
114 }
115
116 /*
117 * Note that IQN formatting is expected to be done in userspace, and
118 * no explict IQN format checks are done here.
119 */
120 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
121 {
122 struct iscsi_tiqn *tiqn = NULL;
123 int ret;
124
125 if (strlen(buf) >= ISCSI_IQN_LEN) {
126 pr_err("Target IQN exceeds %d bytes\n",
127 ISCSI_IQN_LEN);
128 return ERR_PTR(-EINVAL);
129 }
130
131 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
132 if (!tiqn)
133 return ERR_PTR(-ENOMEM);
134
135 sprintf(tiqn->tiqn, "%s", buf);
136 INIT_LIST_HEAD(&tiqn->tiqn_list);
137 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
138 spin_lock_init(&tiqn->tiqn_state_lock);
139 spin_lock_init(&tiqn->tiqn_tpg_lock);
140 spin_lock_init(&tiqn->sess_err_stats.lock);
141 spin_lock_init(&tiqn->login_stats.lock);
142 spin_lock_init(&tiqn->logout_stats.lock);
143
144 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
145
146 idr_preload(GFP_KERNEL);
147 spin_lock(&tiqn_lock);
148
149 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
150 if (ret < 0) {
151 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
152 spin_unlock(&tiqn_lock);
153 idr_preload_end();
154 kfree(tiqn);
155 return ERR_PTR(ret);
156 }
157 tiqn->tiqn_index = ret;
158 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
159
160 spin_unlock(&tiqn_lock);
161 idr_preload_end();
162
163 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
164
165 return tiqn;
166
167 }
168
169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
170 {
171 /*
172 * Wait for accesses to said struct iscsi_tiqn to end.
173 */
174 spin_lock(&tiqn->tiqn_state_lock);
175 while (tiqn->tiqn_access_count != 0) {
176 spin_unlock(&tiqn->tiqn_state_lock);
177 msleep(10);
178 spin_lock(&tiqn->tiqn_state_lock);
179 }
180 spin_unlock(&tiqn->tiqn_state_lock);
181 }
182
183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
184 {
185 /*
186 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
187 * while holding tiqn->tiqn_state_lock. This means that all subsequent
188 * attempts to access this struct iscsi_tiqn will fail from both transport
189 * fabric and control code paths.
190 */
191 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
192 pr_err("iscsit_set_tiqn_shutdown() failed\n");
193 return;
194 }
195
196 iscsit_wait_for_tiqn(tiqn);
197
198 spin_lock(&tiqn_lock);
199 list_del(&tiqn->tiqn_list);
200 idr_remove(&tiqn_idr, tiqn->tiqn_index);
201 spin_unlock(&tiqn_lock);
202
203 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
204 tiqn->tiqn);
205 kfree(tiqn);
206 }
207
208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
209 {
210 int ret;
211 /*
212 * Determine if the network portal is accepting storage traffic.
213 */
214 spin_lock_bh(&np->np_thread_lock);
215 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
216 spin_unlock_bh(&np->np_thread_lock);
217 return -1;
218 }
219 spin_unlock_bh(&np->np_thread_lock);
220 /*
221 * Determine if the portal group is accepting storage traffic.
222 */
223 spin_lock_bh(&tpg->tpg_state_lock);
224 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
225 spin_unlock_bh(&tpg->tpg_state_lock);
226 return -1;
227 }
228 spin_unlock_bh(&tpg->tpg_state_lock);
229
230 /*
231 * Here we serialize access across the TIQN+TPG Tuple.
232 */
233 ret = down_interruptible(&tpg->np_login_sem);
234 if (ret != 0)
235 return -1;
236
237 spin_lock_bh(&tpg->tpg_state_lock);
238 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
239 spin_unlock_bh(&tpg->tpg_state_lock);
240 up(&tpg->np_login_sem);
241 return -1;
242 }
243 spin_unlock_bh(&tpg->tpg_state_lock);
244
245 return 0;
246 }
247
248 void iscsit_login_kref_put(struct kref *kref)
249 {
250 struct iscsi_tpg_np *tpg_np = container_of(kref,
251 struct iscsi_tpg_np, tpg_np_kref);
252
253 complete(&tpg_np->tpg_np_comp);
254 }
255
256 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
257 struct iscsi_tpg_np *tpg_np)
258 {
259 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
260
261 up(&tpg->np_login_sem);
262
263 if (tpg_np)
264 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
265
266 if (tiqn)
267 iscsit_put_tiqn_for_login(tiqn);
268
269 return 0;
270 }
271
272 bool iscsit_check_np_match(
273 struct sockaddr_storage *sockaddr,
274 struct iscsi_np *np,
275 int network_transport)
276 {
277 struct sockaddr_in *sock_in, *sock_in_e;
278 struct sockaddr_in6 *sock_in6, *sock_in6_e;
279 bool ip_match = false;
280 u16 port, port_e;
281
282 if (sockaddr->ss_family == AF_INET6) {
283 sock_in6 = (struct sockaddr_in6 *)sockaddr;
284 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
285
286 if (!memcmp(&sock_in6->sin6_addr.in6_u,
287 &sock_in6_e->sin6_addr.in6_u,
288 sizeof(struct in6_addr)))
289 ip_match = true;
290
291 port = ntohs(sock_in6->sin6_port);
292 port_e = ntohs(sock_in6_e->sin6_port);
293 } else {
294 sock_in = (struct sockaddr_in *)sockaddr;
295 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
296
297 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
298 ip_match = true;
299
300 port = ntohs(sock_in->sin_port);
301 port_e = ntohs(sock_in_e->sin_port);
302 }
303
304 if (ip_match && (port_e == port) &&
305 (np->np_network_transport == network_transport))
306 return true;
307
308 return false;
309 }
310
311 /*
312 * Called with mutex np_lock held
313 */
314 static struct iscsi_np *iscsit_get_np(
315 struct sockaddr_storage *sockaddr,
316 int network_transport)
317 {
318 struct iscsi_np *np;
319 bool match;
320
321 list_for_each_entry(np, &g_np_list, np_list) {
322 spin_lock_bh(&np->np_thread_lock);
323 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
324 spin_unlock_bh(&np->np_thread_lock);
325 continue;
326 }
327
328 match = iscsit_check_np_match(sockaddr, np, network_transport);
329 if (match) {
330 /*
331 * Increment the np_exports reference count now to
332 * prevent iscsit_del_np() below from being called
333 * while iscsi_tpg_add_network_portal() is called.
334 */
335 np->np_exports++;
336 spin_unlock_bh(&np->np_thread_lock);
337 return np;
338 }
339 spin_unlock_bh(&np->np_thread_lock);
340 }
341
342 return NULL;
343 }
344
345 struct iscsi_np *iscsit_add_np(
346 struct sockaddr_storage *sockaddr,
347 int network_transport)
348 {
349 struct iscsi_np *np;
350 int ret;
351
352 mutex_lock(&np_lock);
353
354 /*
355 * Locate the existing struct iscsi_np if already active..
356 */
357 np = iscsit_get_np(sockaddr, network_transport);
358 if (np) {
359 mutex_unlock(&np_lock);
360 return np;
361 }
362
363 np = kzalloc(sizeof(*np), GFP_KERNEL);
364 if (!np) {
365 mutex_unlock(&np_lock);
366 return ERR_PTR(-ENOMEM);
367 }
368
369 np->np_flags |= NPF_IP_NETWORK;
370 np->np_network_transport = network_transport;
371 spin_lock_init(&np->np_thread_lock);
372 init_completion(&np->np_restart_comp);
373 INIT_LIST_HEAD(&np->np_list);
374
375 ret = iscsi_target_setup_login_socket(np, sockaddr);
376 if (ret != 0) {
377 kfree(np);
378 mutex_unlock(&np_lock);
379 return ERR_PTR(ret);
380 }
381
382 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
383 if (IS_ERR(np->np_thread)) {
384 pr_err("Unable to create kthread: iscsi_np\n");
385 ret = PTR_ERR(np->np_thread);
386 kfree(np);
387 mutex_unlock(&np_lock);
388 return ERR_PTR(ret);
389 }
390 /*
391 * Increment the np_exports reference count now to prevent
392 * iscsit_del_np() below from being run while a new call to
393 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
394 * active. We don't need to hold np->np_thread_lock at this
395 * point because iscsi_np has not been added to g_np_list yet.
396 */
397 np->np_exports = 1;
398 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
399
400 list_add_tail(&np->np_list, &g_np_list);
401 mutex_unlock(&np_lock);
402
403 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
404 &np->np_sockaddr, np->np_transport->name);
405
406 return np;
407 }
408
409 int iscsit_reset_np_thread(
410 struct iscsi_np *np,
411 struct iscsi_tpg_np *tpg_np,
412 struct iscsi_portal_group *tpg,
413 bool shutdown)
414 {
415 spin_lock_bh(&np->np_thread_lock);
416 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
417 spin_unlock_bh(&np->np_thread_lock);
418 return 0;
419 }
420 np->np_thread_state = ISCSI_NP_THREAD_RESET;
421
422 if (np->np_thread) {
423 spin_unlock_bh(&np->np_thread_lock);
424 send_sig(SIGINT, np->np_thread, 1);
425 wait_for_completion(&np->np_restart_comp);
426 spin_lock_bh(&np->np_thread_lock);
427 }
428 spin_unlock_bh(&np->np_thread_lock);
429
430 if (tpg_np && shutdown) {
431 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
432
433 wait_for_completion(&tpg_np->tpg_np_comp);
434 }
435
436 return 0;
437 }
438
439 static void iscsit_free_np(struct iscsi_np *np)
440 {
441 if (np->np_socket)
442 sock_release(np->np_socket);
443 }
444
445 int iscsit_del_np(struct iscsi_np *np)
446 {
447 spin_lock_bh(&np->np_thread_lock);
448 np->np_exports--;
449 if (np->np_exports) {
450 np->enabled = true;
451 spin_unlock_bh(&np->np_thread_lock);
452 return 0;
453 }
454 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
455 spin_unlock_bh(&np->np_thread_lock);
456
457 if (np->np_thread) {
458 /*
459 * We need to send the signal to wakeup Linux/Net
460 * which may be sleeping in sock_accept()..
461 */
462 send_sig(SIGINT, np->np_thread, 1);
463 kthread_stop(np->np_thread);
464 np->np_thread = NULL;
465 }
466
467 np->np_transport->iscsit_free_np(np);
468
469 mutex_lock(&np_lock);
470 list_del(&np->np_list);
471 mutex_unlock(&np_lock);
472
473 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
474 &np->np_sockaddr, np->np_transport->name);
475
476 iscsit_put_transport(np->np_transport);
477 kfree(np);
478 return 0;
479 }
480
481 static void iscsit_get_rx_pdu(struct iscsi_conn *);
482
483 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
484 {
485 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
486 }
487 EXPORT_SYMBOL(iscsit_queue_rsp);
488
489 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
490 {
491 spin_lock_bh(&conn->cmd_lock);
492 if (!list_empty(&cmd->i_conn_node) &&
493 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
494 list_del_init(&cmd->i_conn_node);
495 spin_unlock_bh(&conn->cmd_lock);
496
497 __iscsit_free_cmd(cmd, true);
498 }
499 EXPORT_SYMBOL(iscsit_aborted_task);
500
501 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
502 u32, u32, u8 *, u8 *);
503 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
504
505 static int
506 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
507 const void *data_buf, u32 data_buf_len)
508 {
509 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
510 struct kvec *iov;
511 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
512 int ret;
513
514 iov = &cmd->iov_misc[0];
515 iov[niov].iov_base = cmd->pdu;
516 iov[niov++].iov_len = ISCSI_HDR_LEN;
517
518 if (conn->conn_ops->HeaderDigest) {
519 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
520
521 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
522 ISCSI_HDR_LEN, 0, NULL,
523 (u8 *)header_digest);
524
525 iov[0].iov_len += ISCSI_CRC_LEN;
526 tx_size += ISCSI_CRC_LEN;
527 pr_debug("Attaching CRC32C HeaderDigest"
528 " to opcode 0x%x 0x%08x\n",
529 hdr->opcode, *header_digest);
530 }
531
532 if (data_buf_len) {
533 u32 padding = ((-data_buf_len) & 3);
534
535 iov[niov].iov_base = (void *)data_buf;
536 iov[niov++].iov_len = data_buf_len;
537 tx_size += data_buf_len;
538
539 if (padding != 0) {
540 iov[niov].iov_base = &cmd->pad_bytes;
541 iov[niov++].iov_len = padding;
542 tx_size += padding;
543 pr_debug("Attaching %u additional"
544 " padding bytes.\n", padding);
545 }
546
547 if (conn->conn_ops->DataDigest) {
548 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
549 data_buf, data_buf_len,
550 padding,
551 (u8 *)&cmd->pad_bytes,
552 (u8 *)&cmd->data_crc);
553
554 iov[niov].iov_base = &cmd->data_crc;
555 iov[niov++].iov_len = ISCSI_CRC_LEN;
556 tx_size += ISCSI_CRC_LEN;
557 pr_debug("Attached DataDigest for %u"
558 " bytes opcode 0x%x, CRC 0x%08x\n",
559 data_buf_len, hdr->opcode, cmd->data_crc);
560 }
561 }
562
563 cmd->iov_misc_count = niov;
564 cmd->tx_size = tx_size;
565
566 ret = iscsit_send_tx_data(cmd, conn, 1);
567 if (ret < 0) {
568 iscsit_tx_thread_wait_for_tcp(conn);
569 return ret;
570 }
571
572 return 0;
573 }
574
575 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
576 static void iscsit_unmap_iovec(struct iscsi_cmd *);
577 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
578 u32, u32, u32, u8 *);
579 static int
580 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
581 const struct iscsi_datain *datain)
582 {
583 struct kvec *iov;
584 u32 iov_count = 0, tx_size = 0;
585 int ret, iov_ret;
586
587 iov = &cmd->iov_data[0];
588 iov[iov_count].iov_base = cmd->pdu;
589 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
590 tx_size += ISCSI_HDR_LEN;
591
592 if (conn->conn_ops->HeaderDigest) {
593 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
594
595 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
596 ISCSI_HDR_LEN, 0, NULL,
597 (u8 *)header_digest);
598
599 iov[0].iov_len += ISCSI_CRC_LEN;
600 tx_size += ISCSI_CRC_LEN;
601
602 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
603 *header_digest);
604 }
605
606 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
607 datain->offset, datain->length);
608 if (iov_ret < 0)
609 return -1;
610
611 iov_count += iov_ret;
612 tx_size += datain->length;
613
614 cmd->padding = ((-datain->length) & 3);
615 if (cmd->padding) {
616 iov[iov_count].iov_base = cmd->pad_bytes;
617 iov[iov_count++].iov_len = cmd->padding;
618 tx_size += cmd->padding;
619
620 pr_debug("Attaching %u padding bytes\n", cmd->padding);
621 }
622
623 if (conn->conn_ops->DataDigest) {
624 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
625 cmd, datain->offset,
626 datain->length,
627 cmd->padding,
628 cmd->pad_bytes);
629
630 iov[iov_count].iov_base = &cmd->data_crc;
631 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
632 tx_size += ISCSI_CRC_LEN;
633
634 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
635 datain->length + cmd->padding, cmd->data_crc);
636 }
637
638 cmd->iov_data_count = iov_count;
639 cmd->tx_size = tx_size;
640
641 ret = iscsit_fe_sendpage_sg(cmd, conn);
642
643 iscsit_unmap_iovec(cmd);
644
645 if (ret < 0) {
646 iscsit_tx_thread_wait_for_tcp(conn);
647 return ret;
648 }
649
650 return 0;
651 }
652
653 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
654 struct iscsi_datain_req *dr, const void *buf,
655 u32 buf_len)
656 {
657 if (dr)
658 return iscsit_xmit_datain_pdu(conn, cmd, buf);
659 else
660 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
661 }
662
663 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
664 {
665 return TARGET_PROT_NORMAL;
666 }
667
668 static struct iscsit_transport iscsi_target_transport = {
669 .name = "iSCSI/TCP",
670 .transport_type = ISCSI_TCP,
671 .rdma_shutdown = false,
672 .owner = NULL,
673 .iscsit_setup_np = iscsit_setup_np,
674 .iscsit_accept_np = iscsit_accept_np,
675 .iscsit_free_np = iscsit_free_np,
676 .iscsit_get_login_rx = iscsit_get_login_rx,
677 .iscsit_put_login_tx = iscsit_put_login_tx,
678 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
679 .iscsit_immediate_queue = iscsit_immediate_queue,
680 .iscsit_response_queue = iscsit_response_queue,
681 .iscsit_queue_data_in = iscsit_queue_rsp,
682 .iscsit_queue_status = iscsit_queue_rsp,
683 .iscsit_aborted_task = iscsit_aborted_task,
684 .iscsit_xmit_pdu = iscsit_xmit_pdu,
685 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
686 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
687 };
688
689 static int __init iscsi_target_init_module(void)
690 {
691 int ret = 0, size;
692
693 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
694 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
695 if (!iscsit_global)
696 return -1;
697
698 spin_lock_init(&iscsit_global->ts_bitmap_lock);
699 mutex_init(&auth_id_lock);
700 spin_lock_init(&sess_idr_lock);
701 idr_init(&tiqn_idr);
702 idr_init(&sess_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
837 if (!cmd->conn) {
838 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
839 cmd->init_task_tag);
840 return -1;
841 }
842 conn = cmd->conn;
843
844 cmd->iscsi_opcode = ISCSI_OP_REJECT;
845 cmd->reject_reason = reason;
846
847 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
848 if (!cmd->buf_ptr) {
849 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
850 iscsit_free_cmd(cmd, false);
851 return -1;
852 }
853
854 if (add_to_conn) {
855 spin_lock_bh(&conn->cmd_lock);
856 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
857 spin_unlock_bh(&conn->cmd_lock);
858 }
859
860 cmd->i_state = ISTATE_SEND_REJECT;
861 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
862 /*
863 * Perform the kref_put now if se_cmd has already been setup by
864 * scsit_setup_scsi_cmd()
865 */
866 if (cmd->se_cmd.se_tfo != NULL) {
867 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
868 target_put_sess_cmd(&cmd->se_cmd);
869 }
870 return -1;
871 }
872
873 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
874 unsigned char *buf)
875 {
876 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
877 }
878
879 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
880 {
881 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
882 }
883 EXPORT_SYMBOL(iscsit_reject_cmd);
884
885 /*
886 * Map some portion of the allocated scatterlist to an iovec, suitable for
887 * kernel sockets to copy data in/out.
888 */
889 static int iscsit_map_iovec(
890 struct iscsi_cmd *cmd,
891 struct kvec *iov,
892 u32 data_offset,
893 u32 data_length)
894 {
895 u32 i = 0;
896 struct scatterlist *sg;
897 unsigned int page_off;
898
899 /*
900 * We know each entry in t_data_sg contains a page.
901 */
902 u32 ent = data_offset / PAGE_SIZE;
903
904 if (ent >= cmd->se_cmd.t_data_nents) {
905 pr_err("Initial page entry out-of-bounds\n");
906 return -1;
907 }
908
909 sg = &cmd->se_cmd.t_data_sg[ent];
910 page_off = (data_offset % PAGE_SIZE);
911
912 cmd->first_data_sg = sg;
913 cmd->first_data_sg_off = page_off;
914
915 while (data_length) {
916 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
917
918 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
919 iov[i].iov_len = cur_len;
920
921 data_length -= cur_len;
922 page_off = 0;
923 sg = sg_next(sg);
924 i++;
925 }
926
927 cmd->kmapped_nents = i;
928
929 return i;
930 }
931
932 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
933 {
934 u32 i;
935 struct scatterlist *sg;
936
937 sg = cmd->first_data_sg;
938
939 for (i = 0; i < cmd->kmapped_nents; i++)
940 kunmap(sg_page(&sg[i]));
941 }
942
943 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
944 {
945 LIST_HEAD(ack_list);
946 struct iscsi_cmd *cmd, *cmd_p;
947
948 conn->exp_statsn = exp_statsn;
949
950 if (conn->sess->sess_ops->RDMAExtensions)
951 return;
952
953 spin_lock_bh(&conn->cmd_lock);
954 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
955 spin_lock(&cmd->istate_lock);
956 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
957 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
958 cmd->i_state = ISTATE_REMOVE;
959 spin_unlock(&cmd->istate_lock);
960 list_move_tail(&cmd->i_conn_node, &ack_list);
961 continue;
962 }
963 spin_unlock(&cmd->istate_lock);
964 }
965 spin_unlock_bh(&conn->cmd_lock);
966
967 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
968 list_del_init(&cmd->i_conn_node);
969 iscsit_free_cmd(cmd, false);
970 }
971 }
972
973 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
974 {
975 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
976
977 iov_count += ISCSI_IOV_DATA_BUFFER;
978 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
979 if (!cmd->iov_data)
980 return -ENOMEM;
981
982 cmd->orig_iov_data_count = iov_count;
983 return 0;
984 }
985
986 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
987 unsigned char *buf)
988 {
989 int data_direction, payload_length;
990 struct iscsi_scsi_req *hdr;
991 int iscsi_task_attr;
992 int sam_task_attr;
993
994 atomic_long_inc(&conn->sess->cmd_pdus);
995
996 hdr = (struct iscsi_scsi_req *) buf;
997 payload_length = ntoh24(hdr->dlength);
998
999 /* FIXME; Add checks for AdditionalHeaderSegment */
1000
1001 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1002 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1003 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1004 " not set. Bad iSCSI Initiator.\n");
1005 return iscsit_add_reject_cmd(cmd,
1006 ISCSI_REASON_BOOKMARK_INVALID, buf);
1007 }
1008
1009 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1010 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1011 /*
1012 * From RFC-3720 Section 10.3.1:
1013 *
1014 * "Either or both of R and W MAY be 1 when either the
1015 * Expected Data Transfer Length and/or Bidirectional Read
1016 * Expected Data Transfer Length are 0"
1017 *
1018 * For this case, go ahead and clear the unnecssary bits
1019 * to avoid any confusion with ->data_direction.
1020 */
1021 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1022 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1023
1024 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1025 " set when Expected Data Transfer Length is 0 for"
1026 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1027 }
1028
1029 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1030 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1031 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1032 " MUST be set if Expected Data Transfer Length is not 0."
1033 " Bad iSCSI Initiator\n");
1034 return iscsit_add_reject_cmd(cmd,
1035 ISCSI_REASON_BOOKMARK_INVALID, buf);
1036 }
1037
1038 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1039 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1040 pr_err("Bidirectional operations not supported!\n");
1041 return iscsit_add_reject_cmd(cmd,
1042 ISCSI_REASON_BOOKMARK_INVALID, buf);
1043 }
1044
1045 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1046 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1047 " Scsi Command PDU.\n");
1048 return iscsit_add_reject_cmd(cmd,
1049 ISCSI_REASON_BOOKMARK_INVALID, buf);
1050 }
1051
1052 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1053 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1054 " protocol error.\n", payload_length);
1055 return iscsit_add_reject_cmd(cmd,
1056 ISCSI_REASON_PROTOCOL_ERROR, buf);
1057 }
1058
1059 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1060 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1061 pr_err("Expected Data Transfer Length and Length of"
1062 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1063 " bit is not set protocol error\n");
1064 return iscsit_add_reject_cmd(cmd,
1065 ISCSI_REASON_PROTOCOL_ERROR, buf);
1066 }
1067
1068 if (payload_length > be32_to_cpu(hdr->data_length)) {
1069 pr_err("DataSegmentLength: %u is greater than"
1070 " EDTL: %u, protocol error.\n", payload_length,
1071 hdr->data_length);
1072 return iscsit_add_reject_cmd(cmd,
1073 ISCSI_REASON_PROTOCOL_ERROR, buf);
1074 }
1075
1076 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1077 pr_err("DataSegmentLength: %u is greater than"
1078 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1079 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1080 return iscsit_add_reject_cmd(cmd,
1081 ISCSI_REASON_PROTOCOL_ERROR, buf);
1082 }
1083
1084 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1085 pr_err("DataSegmentLength: %u is greater than"
1086 " FirstBurstLength: %u, protocol error.\n",
1087 payload_length, conn->sess->sess_ops->FirstBurstLength);
1088 return iscsit_add_reject_cmd(cmd,
1089 ISCSI_REASON_BOOKMARK_INVALID, buf);
1090 }
1091
1092 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1093 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1094 DMA_NONE;
1095
1096 cmd->data_direction = data_direction;
1097 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1098 /*
1099 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1100 */
1101 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1102 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1103 sam_task_attr = TCM_SIMPLE_TAG;
1104 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1105 sam_task_attr = TCM_ORDERED_TAG;
1106 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1107 sam_task_attr = TCM_HEAD_TAG;
1108 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1109 sam_task_attr = TCM_ACA_TAG;
1110 else {
1111 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1112 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1113 sam_task_attr = TCM_SIMPLE_TAG;
1114 }
1115
1116 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1117 cmd->i_state = ISTATE_NEW_CMD;
1118 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1119 cmd->immediate_data = (payload_length) ? 1 : 0;
1120 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1121 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1122 if (cmd->unsolicited_data)
1123 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1124
1125 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1126 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1127 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1128 else
1129 cmd->targ_xfer_tag = 0xFFFFFFFF;
1130 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1131 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1132 cmd->first_burst_len = payload_length;
1133
1134 if (!conn->sess->sess_ops->RDMAExtensions &&
1135 cmd->data_direction == DMA_FROM_DEVICE) {
1136 struct iscsi_datain_req *dr;
1137
1138 dr = iscsit_allocate_datain_req();
1139 if (!dr)
1140 return iscsit_add_reject_cmd(cmd,
1141 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1142
1143 iscsit_attach_datain_req(cmd, dr);
1144 }
1145
1146 /*
1147 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1148 */
1149 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1150 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1151 cmd->data_direction, sam_task_attr,
1152 cmd->sense_buffer + 2);
1153
1154 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1155 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1156 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1157 conn->cid);
1158
1159 target_get_sess_cmd(&cmd->se_cmd, true);
1160
1161 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1162 scsilun_to_int(&hdr->lun));
1163 if (cmd->sense_reason)
1164 goto attach_cmd;
1165
1166 /* only used for printks or comparing with ->ref_task_tag */
1167 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1168 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1169 if (cmd->sense_reason) {
1170 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1171 return iscsit_add_reject_cmd(cmd,
1172 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1173 }
1174
1175 goto attach_cmd;
1176 }
1177
1178 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1179 return iscsit_add_reject_cmd(cmd,
1180 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1181 }
1182
1183 attach_cmd:
1184 spin_lock_bh(&conn->cmd_lock);
1185 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1186 spin_unlock_bh(&conn->cmd_lock);
1187 /*
1188 * Check if we need to delay processing because of ALUA
1189 * Active/NonOptimized primary access state..
1190 */
1191 core_alua_check_nonop_delay(&cmd->se_cmd);
1192
1193 return 0;
1194 }
1195 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1196
1197 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1198 {
1199 iscsit_set_dataout_sequence_values(cmd);
1200
1201 spin_lock_bh(&cmd->dataout_timeout_lock);
1202 iscsit_start_dataout_timer(cmd, cmd->conn);
1203 spin_unlock_bh(&cmd->dataout_timeout_lock);
1204 }
1205 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1206
1207 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1208 struct iscsi_scsi_req *hdr)
1209 {
1210 int cmdsn_ret = 0;
1211 /*
1212 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1213 * the Immediate Bit is not set, and no Immediate
1214 * Data is attached.
1215 *
1216 * A PDU/CmdSN carrying Immediate Data can only
1217 * be processed after the DataCRC has passed.
1218 * If the DataCRC fails, the CmdSN MUST NOT
1219 * be acknowledged. (See below)
1220 */
1221 if (!cmd->immediate_data) {
1222 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1223 (unsigned char *)hdr, hdr->cmdsn);
1224 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1225 return -1;
1226 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1227 target_put_sess_cmd(&cmd->se_cmd);
1228 return 0;
1229 }
1230 }
1231
1232 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1233
1234 /*
1235 * If no Immediate Data is attached, it's OK to return now.
1236 */
1237 if (!cmd->immediate_data) {
1238 if (!cmd->sense_reason && cmd->unsolicited_data)
1239 iscsit_set_unsoliticed_dataout(cmd);
1240 if (!cmd->sense_reason)
1241 return 0;
1242
1243 target_put_sess_cmd(&cmd->se_cmd);
1244 return 0;
1245 }
1246
1247 /*
1248 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1249 * execution. These exceptions are processed in CmdSN order using
1250 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1251 */
1252 if (cmd->sense_reason)
1253 return 1;
1254 /*
1255 * Call directly into transport_generic_new_cmd() to perform
1256 * the backend memory allocation.
1257 */
1258 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1259 if (cmd->sense_reason)
1260 return 1;
1261
1262 return 0;
1263 }
1264 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1265
1266 static int
1267 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1268 bool dump_payload)
1269 {
1270 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1271 /*
1272 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1273 */
1274 if (dump_payload)
1275 goto after_immediate_data;
1276 /*
1277 * Check for underflow case where both EDTL and immediate data payload
1278 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1279 * already been set in target_cmd_size_check() as se_cmd->data_length.
1280 *
1281 * For this special case, fail the command and dump the immediate data
1282 * payload.
1283 */
1284 if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1285 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1286 goto after_immediate_data;
1287 }
1288
1289 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1290 cmd->first_burst_len);
1291 after_immediate_data:
1292 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1293 /*
1294 * A PDU/CmdSN carrying Immediate Data passed
1295 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1296 * Immediate Bit is not set.
1297 */
1298 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1299 (unsigned char *)hdr, hdr->cmdsn);
1300 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1301 return -1;
1302
1303 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1304 int rc;
1305
1306 rc = iscsit_dump_data_payload(cmd->conn,
1307 cmd->first_burst_len, 1);
1308 target_put_sess_cmd(&cmd->se_cmd);
1309 return rc;
1310 } else if (cmd->unsolicited_data)
1311 iscsit_set_unsoliticed_dataout(cmd);
1312
1313 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1314 /*
1315 * Immediate Data failed DataCRC and ERL>=1,
1316 * silently drop this PDU and let the initiator
1317 * plug the CmdSN gap.
1318 *
1319 * FIXME: Send Unsolicited NOPIN with reserved
1320 * TTT here to help the initiator figure out
1321 * the missing CmdSN, although they should be
1322 * intelligent enough to determine the missing
1323 * CmdSN and issue a retry to plug the sequence.
1324 */
1325 cmd->i_state = ISTATE_REMOVE;
1326 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1327 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1328 return -1;
1329
1330 return 0;
1331 }
1332
1333 static int
1334 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1335 unsigned char *buf)
1336 {
1337 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1338 int rc, immed_data;
1339 bool dump_payload = false;
1340
1341 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1342 if (rc < 0)
1343 return 0;
1344 /*
1345 * Allocation iovecs needed for struct socket operations for
1346 * traditional iSCSI block I/O.
1347 */
1348 if (iscsit_allocate_iovecs(cmd) < 0) {
1349 return iscsit_reject_cmd(cmd,
1350 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1351 }
1352 immed_data = cmd->immediate_data;
1353
1354 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1355 if (rc < 0)
1356 return rc;
1357 else if (rc > 0)
1358 dump_payload = true;
1359
1360 if (!immed_data)
1361 return 0;
1362
1363 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1364 }
1365
1366 static u32 iscsit_do_crypto_hash_sg(
1367 struct ahash_request *hash,
1368 struct iscsi_cmd *cmd,
1369 u32 data_offset,
1370 u32 data_length,
1371 u32 padding,
1372 u8 *pad_bytes)
1373 {
1374 u32 data_crc;
1375 struct scatterlist *sg;
1376 unsigned int page_off;
1377
1378 crypto_ahash_init(hash);
1379
1380 sg = cmd->first_data_sg;
1381 page_off = cmd->first_data_sg_off;
1382
1383 while (data_length) {
1384 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1385
1386 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1387 crypto_ahash_update(hash);
1388
1389 data_length -= cur_len;
1390 page_off = 0;
1391 /* iscsit_map_iovec has already checked for invalid sg pointers */
1392 sg = sg_next(sg);
1393 }
1394
1395 if (padding) {
1396 struct scatterlist pad_sg;
1397
1398 sg_init_one(&pad_sg, pad_bytes, padding);
1399 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1400 padding);
1401 crypto_ahash_finup(hash);
1402 } else {
1403 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1404 crypto_ahash_final(hash);
1405 }
1406
1407 return data_crc;
1408 }
1409
1410 static void iscsit_do_crypto_hash_buf(
1411 struct ahash_request *hash,
1412 const void *buf,
1413 u32 payload_length,
1414 u32 padding,
1415 u8 *pad_bytes,
1416 u8 *data_crc)
1417 {
1418 struct scatterlist sg[2];
1419
1420 sg_init_table(sg, ARRAY_SIZE(sg));
1421 sg_set_buf(sg, buf, payload_length);
1422 sg_set_buf(sg + 1, pad_bytes, padding);
1423
1424 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1425
1426 crypto_ahash_digest(hash);
1427 }
1428
1429 int
1430 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1431 struct iscsi_cmd *cmd, u32 payload_length,
1432 bool *success)
1433 {
1434 struct iscsi_data *hdr = buf;
1435 struct se_cmd *se_cmd;
1436 int rc;
1437
1438 /* iSCSI write */
1439 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1440
1441 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1442 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1443 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1444 payload_length, conn->cid);
1445
1446 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1447 pr_err("Command ITT: 0x%08x received DataOUT after"
1448 " last DataOUT received, dumping payload\n",
1449 cmd->init_task_tag);
1450 return iscsit_dump_data_payload(conn, payload_length, 1);
1451 }
1452
1453 if (cmd->data_direction != DMA_TO_DEVICE) {
1454 pr_err("Command ITT: 0x%08x received DataOUT for a"
1455 " NON-WRITE command.\n", cmd->init_task_tag);
1456 return iscsit_dump_data_payload(conn, payload_length, 1);
1457 }
1458 se_cmd = &cmd->se_cmd;
1459 iscsit_mod_dataout_timer(cmd);
1460
1461 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1462 pr_err("DataOut Offset: %u, Length %u greater than"
1463 " iSCSI Command EDTL %u, protocol error.\n",
1464 hdr->offset, payload_length, cmd->se_cmd.data_length);
1465 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1466 }
1467
1468 if (cmd->unsolicited_data) {
1469 int dump_unsolicited_data = 0;
1470
1471 if (conn->sess->sess_ops->InitialR2T) {
1472 pr_err("Received unexpected unsolicited data"
1473 " while InitialR2T=Yes, protocol error.\n");
1474 transport_send_check_condition_and_sense(&cmd->se_cmd,
1475 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1476 return -1;
1477 }
1478 /*
1479 * Special case for dealing with Unsolicited DataOUT
1480 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1481 * failures;
1482 */
1483
1484 /* Something's amiss if we're not in WRITE_PENDING state... */
1485 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1486 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1487 dump_unsolicited_data = 1;
1488
1489 if (dump_unsolicited_data) {
1490 /*
1491 * Check if a delayed TASK_ABORTED status needs to
1492 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1493 * received with the unsolicited data out.
1494 */
1495 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1496 iscsit_stop_dataout_timer(cmd);
1497
1498 transport_check_aborted_status(se_cmd,
1499 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1500 return iscsit_dump_data_payload(conn, payload_length, 1);
1501 }
1502 } else {
1503 /*
1504 * For the normal solicited data path:
1505 *
1506 * Check for a delayed TASK_ABORTED status and dump any
1507 * incoming data out payload if one exists. Also, when the
1508 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1509 * data out sequence, we decrement outstanding_r2ts. Once
1510 * outstanding_r2ts reaches zero, go ahead and send the delayed
1511 * TASK_ABORTED status.
1512 */
1513 if (se_cmd->transport_state & CMD_T_ABORTED) {
1514 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1515 if (--cmd->outstanding_r2ts < 1) {
1516 iscsit_stop_dataout_timer(cmd);
1517 transport_check_aborted_status(
1518 se_cmd, 1);
1519 }
1520
1521 return iscsit_dump_data_payload(conn, payload_length, 1);
1522 }
1523 }
1524 /*
1525 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1526 * within-command recovery checks before receiving the payload.
1527 */
1528 rc = iscsit_check_pre_dataout(cmd, buf);
1529 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1530 return 0;
1531 else if (rc == DATAOUT_CANNOT_RECOVER)
1532 return -1;
1533 *success = true;
1534 return 0;
1535 }
1536 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1537
1538 int
1539 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1540 struct iscsi_cmd **out_cmd)
1541 {
1542 struct iscsi_data *hdr = buf;
1543 struct iscsi_cmd *cmd;
1544 u32 payload_length = ntoh24(hdr->dlength);
1545 int rc;
1546 bool success = false;
1547
1548 if (!payload_length) {
1549 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1550 return 0;
1551 }
1552
1553 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1554 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1555 " MaxXmitDataSegmentLength: %u\n", payload_length,
1556 conn->conn_ops->MaxXmitDataSegmentLength);
1557 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1558 }
1559
1560 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1561 if (!cmd)
1562 return 0;
1563
1564 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1565
1566 if (success)
1567 *out_cmd = cmd;
1568
1569 return rc;
1570 }
1571 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1572
1573 static int
1574 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1575 struct iscsi_data *hdr)
1576 {
1577 struct kvec *iov;
1578 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1579 u32 payload_length = ntoh24(hdr->dlength);
1580 int iov_ret, data_crc_failed = 0;
1581
1582 rx_size += payload_length;
1583 iov = &cmd->iov_data[0];
1584
1585 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1586 payload_length);
1587 if (iov_ret < 0)
1588 return -1;
1589
1590 iov_count += iov_ret;
1591
1592 padding = ((-payload_length) & 3);
1593 if (padding != 0) {
1594 iov[iov_count].iov_base = cmd->pad_bytes;
1595 iov[iov_count++].iov_len = padding;
1596 rx_size += padding;
1597 pr_debug("Receiving %u padding bytes.\n", padding);
1598 }
1599
1600 if (conn->conn_ops->DataDigest) {
1601 iov[iov_count].iov_base = &checksum;
1602 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1603 rx_size += ISCSI_CRC_LEN;
1604 }
1605
1606 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1607
1608 iscsit_unmap_iovec(cmd);
1609
1610 if (rx_got != rx_size)
1611 return -1;
1612
1613 if (conn->conn_ops->DataDigest) {
1614 u32 data_crc;
1615
1616 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1617 be32_to_cpu(hdr->offset),
1618 payload_length, padding,
1619 cmd->pad_bytes);
1620
1621 if (checksum != data_crc) {
1622 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1623 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1624 " does not match computed 0x%08x\n",
1625 hdr->itt, hdr->offset, payload_length,
1626 hdr->datasn, checksum, data_crc);
1627 data_crc_failed = 1;
1628 } else {
1629 pr_debug("Got CRC32C DataDigest 0x%08x for"
1630 " %u bytes of Data Out\n", checksum,
1631 payload_length);
1632 }
1633 }
1634
1635 return data_crc_failed;
1636 }
1637
1638 int
1639 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1640 bool data_crc_failed)
1641 {
1642 struct iscsi_conn *conn = cmd->conn;
1643 int rc, ooo_cmdsn;
1644 /*
1645 * Increment post receive data and CRC values or perform
1646 * within-command recovery.
1647 */
1648 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1649 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1650 return 0;
1651 else if (rc == DATAOUT_SEND_R2T) {
1652 iscsit_set_dataout_sequence_values(cmd);
1653 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1654 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1655 /*
1656 * Handle extra special case for out of order
1657 * Unsolicited Data Out.
1658 */
1659 spin_lock_bh(&cmd->istate_lock);
1660 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1661 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1662 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1663 spin_unlock_bh(&cmd->istate_lock);
1664
1665 iscsit_stop_dataout_timer(cmd);
1666 if (ooo_cmdsn)
1667 return 0;
1668 target_execute_cmd(&cmd->se_cmd);
1669 return 0;
1670 } else /* DATAOUT_CANNOT_RECOVER */
1671 return -1;
1672
1673 return 0;
1674 }
1675 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1676
1677 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1678 {
1679 struct iscsi_cmd *cmd = NULL;
1680 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1681 int rc;
1682 bool data_crc_failed = false;
1683
1684 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1685 if (rc < 0)
1686 return 0;
1687 else if (!cmd)
1688 return 0;
1689
1690 rc = iscsit_get_dataout(conn, cmd, hdr);
1691 if (rc < 0)
1692 return rc;
1693 else if (rc > 0)
1694 data_crc_failed = true;
1695
1696 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1697 }
1698
1699 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1700 struct iscsi_nopout *hdr)
1701 {
1702 u32 payload_length = ntoh24(hdr->dlength);
1703
1704 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1705 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1706 if (!cmd)
1707 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1708 (unsigned char *)hdr);
1709
1710 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1711 (unsigned char *)hdr);
1712 }
1713
1714 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1715 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1716 " not set, protocol error.\n");
1717 if (!cmd)
1718 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1719 (unsigned char *)hdr);
1720
1721 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1722 (unsigned char *)hdr);
1723 }
1724
1725 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1726 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1727 " greater than MaxXmitDataSegmentLength: %u, protocol"
1728 " error.\n", payload_length,
1729 conn->conn_ops->MaxXmitDataSegmentLength);
1730 if (!cmd)
1731 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1732 (unsigned char *)hdr);
1733
1734 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1735 (unsigned char *)hdr);
1736 }
1737
1738 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1739 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1740 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1741 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1742 payload_length);
1743 /*
1744 * This is not a response to a Unsolicited NopIN, which means
1745 * it can either be a NOPOUT ping request (with a valid ITT),
1746 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1747 * Either way, make sure we allocate an struct iscsi_cmd, as both
1748 * can contain ping data.
1749 */
1750 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1751 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1752 cmd->i_state = ISTATE_SEND_NOPIN;
1753 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1754 1 : 0);
1755 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1756 cmd->targ_xfer_tag = 0xFFFFFFFF;
1757 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1758 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1759 cmd->data_direction = DMA_NONE;
1760 }
1761
1762 return 0;
1763 }
1764 EXPORT_SYMBOL(iscsit_setup_nop_out);
1765
1766 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1767 struct iscsi_nopout *hdr)
1768 {
1769 struct iscsi_cmd *cmd_p = NULL;
1770 int cmdsn_ret = 0;
1771 /*
1772 * Initiator is expecting a NopIN ping reply..
1773 */
1774 if (hdr->itt != RESERVED_ITT) {
1775 if (!cmd)
1776 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1777 (unsigned char *)hdr);
1778
1779 spin_lock_bh(&conn->cmd_lock);
1780 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1781 spin_unlock_bh(&conn->cmd_lock);
1782
1783 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1784
1785 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1786 iscsit_add_cmd_to_response_queue(cmd, conn,
1787 cmd->i_state);
1788 return 0;
1789 }
1790
1791 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1792 (unsigned char *)hdr, hdr->cmdsn);
1793 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1794 return 0;
1795 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1796 return -1;
1797
1798 return 0;
1799 }
1800 /*
1801 * This was a response to a unsolicited NOPIN ping.
1802 */
1803 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1804 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1805 if (!cmd_p)
1806 return -EINVAL;
1807
1808 iscsit_stop_nopin_response_timer(conn);
1809
1810 cmd_p->i_state = ISTATE_REMOVE;
1811 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1812
1813 iscsit_start_nopin_timer(conn);
1814 return 0;
1815 }
1816 /*
1817 * Otherwise, initiator is not expecting a NOPIN is response.
1818 * Just ignore for now.
1819 */
1820
1821 if (cmd)
1822 iscsit_free_cmd(cmd, false);
1823
1824 return 0;
1825 }
1826 EXPORT_SYMBOL(iscsit_process_nop_out);
1827
1828 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1829 unsigned char *buf)
1830 {
1831 unsigned char *ping_data = NULL;
1832 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1833 struct kvec *iov = NULL;
1834 u32 payload_length = ntoh24(hdr->dlength);
1835 int ret;
1836
1837 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1838 if (ret < 0)
1839 return 0;
1840 /*
1841 * Handle NOP-OUT payload for traditional iSCSI sockets
1842 */
1843 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1844 u32 checksum, data_crc, padding = 0;
1845 int niov = 0, rx_got, rx_size = payload_length;
1846
1847 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1848 if (!ping_data) {
1849 ret = -1;
1850 goto out;
1851 }
1852
1853 iov = &cmd->iov_misc[0];
1854 iov[niov].iov_base = ping_data;
1855 iov[niov++].iov_len = payload_length;
1856
1857 padding = ((-payload_length) & 3);
1858 if (padding != 0) {
1859 pr_debug("Receiving %u additional bytes"
1860 " for padding.\n", padding);
1861 iov[niov].iov_base = &cmd->pad_bytes;
1862 iov[niov++].iov_len = padding;
1863 rx_size += padding;
1864 }
1865 if (conn->conn_ops->DataDigest) {
1866 iov[niov].iov_base = &checksum;
1867 iov[niov++].iov_len = ISCSI_CRC_LEN;
1868 rx_size += ISCSI_CRC_LEN;
1869 }
1870
1871 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1872 if (rx_got != rx_size) {
1873 ret = -1;
1874 goto out;
1875 }
1876
1877 if (conn->conn_ops->DataDigest) {
1878 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1879 ping_data, payload_length,
1880 padding, cmd->pad_bytes,
1881 (u8 *)&data_crc);
1882
1883 if (checksum != data_crc) {
1884 pr_err("Ping data CRC32C DataDigest"
1885 " 0x%08x does not match computed 0x%08x\n",
1886 checksum, data_crc);
1887 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1888 pr_err("Unable to recover from"
1889 " NOPOUT Ping DataCRC failure while in"
1890 " ERL=0.\n");
1891 ret = -1;
1892 goto out;
1893 } else {
1894 /*
1895 * Silently drop this PDU and let the
1896 * initiator plug the CmdSN gap.
1897 */
1898 pr_debug("Dropping NOPOUT"
1899 " Command CmdSN: 0x%08x due to"
1900 " DataCRC error.\n", hdr->cmdsn);
1901 ret = 0;
1902 goto out;
1903 }
1904 } else {
1905 pr_debug("Got CRC32C DataDigest"
1906 " 0x%08x for %u bytes of ping data.\n",
1907 checksum, payload_length);
1908 }
1909 }
1910
1911 ping_data[payload_length] = '\0';
1912 /*
1913 * Attach ping data to struct iscsi_cmd->buf_ptr.
1914 */
1915 cmd->buf_ptr = ping_data;
1916 cmd->buf_ptr_size = payload_length;
1917
1918 pr_debug("Got %u bytes of NOPOUT ping"
1919 " data.\n", payload_length);
1920 pr_debug("Ping Data: \"%s\"\n", ping_data);
1921 }
1922
1923 return iscsit_process_nop_out(conn, cmd, hdr);
1924 out:
1925 if (cmd)
1926 iscsit_free_cmd(cmd, false);
1927
1928 kfree(ping_data);
1929 return ret;
1930 }
1931
1932 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1933 {
1934 switch (iscsi_tmf) {
1935 case ISCSI_TM_FUNC_ABORT_TASK:
1936 return TMR_ABORT_TASK;
1937 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1938 return TMR_ABORT_TASK_SET;
1939 case ISCSI_TM_FUNC_CLEAR_ACA:
1940 return TMR_CLEAR_ACA;
1941 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1942 return TMR_CLEAR_TASK_SET;
1943 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1944 return TMR_LUN_RESET;
1945 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1946 return TMR_TARGET_WARM_RESET;
1947 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1948 return TMR_TARGET_COLD_RESET;
1949 default:
1950 return TMR_UNKNOWN;
1951 }
1952 }
1953
1954 int
1955 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1956 unsigned char *buf)
1957 {
1958 struct se_tmr_req *se_tmr;
1959 struct iscsi_tmr_req *tmr_req;
1960 struct iscsi_tm *hdr;
1961 int out_of_order_cmdsn = 0, ret;
1962 bool sess_ref = false;
1963 u8 function, tcm_function = TMR_UNKNOWN;
1964
1965 hdr = (struct iscsi_tm *) buf;
1966 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1967 function = hdr->flags;
1968
1969 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1970 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1971 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1972 hdr->rtt, hdr->refcmdsn, conn->cid);
1973
1974 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1975 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1976 hdr->rtt != RESERVED_ITT)) {
1977 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1978 hdr->rtt = RESERVED_ITT;
1979 }
1980
1981 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1982 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1983 pr_err("Task Management Request TASK_REASSIGN not"
1984 " issued as immediate command, bad iSCSI Initiator"
1985 "implementation\n");
1986 return iscsit_add_reject_cmd(cmd,
1987 ISCSI_REASON_PROTOCOL_ERROR, buf);
1988 }
1989 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1990 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1991 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1992
1993 cmd->data_direction = DMA_NONE;
1994 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1995 if (!cmd->tmr_req)
1996 return iscsit_add_reject_cmd(cmd,
1997 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1998 buf);
1999
2000 /*
2001 * TASK_REASSIGN for ERL=2 / connection stays inside of
2002 * LIO-Target $FABRIC_MOD
2003 */
2004 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2005 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2006 conn->sess->se_sess, 0, DMA_NONE,
2007 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2008
2009 target_get_sess_cmd(&cmd->se_cmd, true);
2010 sess_ref = true;
2011 tcm_function = iscsit_convert_tmf(function);
2012 if (tcm_function == TMR_UNKNOWN) {
2013 pr_err("Unknown iSCSI TMR Function:"
2014 " 0x%02x\n", function);
2015 return iscsit_add_reject_cmd(cmd,
2016 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2017 }
2018 }
2019 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2020 GFP_KERNEL);
2021 if (ret < 0)
2022 return iscsit_add_reject_cmd(cmd,
2023 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2024
2025 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2026
2027 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2028 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2029 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2030 cmd->init_task_tag = hdr->itt;
2031 cmd->targ_xfer_tag = 0xFFFFFFFF;
2032 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2033 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2034 se_tmr = cmd->se_cmd.se_tmr_req;
2035 tmr_req = cmd->tmr_req;
2036 /*
2037 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2038 */
2039 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2040 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2041 scsilun_to_int(&hdr->lun));
2042 if (ret < 0) {
2043 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2044 goto attach;
2045 }
2046 }
2047
2048 switch (function) {
2049 case ISCSI_TM_FUNC_ABORT_TASK:
2050 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2051 if (se_tmr->response)
2052 goto attach;
2053 break;
2054 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2055 case ISCSI_TM_FUNC_CLEAR_ACA:
2056 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2057 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2058 break;
2059 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2060 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2061 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2062 goto attach;
2063 }
2064 break;
2065 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2066 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2067 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2068 goto attach;
2069 }
2070 break;
2071 case ISCSI_TM_FUNC_TASK_REASSIGN:
2072 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2073 /*
2074 * Perform sanity checks on the ExpDataSN only if the
2075 * TASK_REASSIGN was successful.
2076 */
2077 if (se_tmr->response)
2078 break;
2079
2080 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2081 return iscsit_add_reject_cmd(cmd,
2082 ISCSI_REASON_BOOKMARK_INVALID, buf);
2083 break;
2084 default:
2085 pr_err("Unknown TMR function: 0x%02x, protocol"
2086 " error.\n", function);
2087 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2088 goto attach;
2089 }
2090
2091 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2092 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2093 se_tmr->call_transport = 1;
2094 attach:
2095 spin_lock_bh(&conn->cmd_lock);
2096 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2097 spin_unlock_bh(&conn->cmd_lock);
2098
2099 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2100 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2101 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
2102 out_of_order_cmdsn = 1;
2103 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2104 return 0;
2105 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2106 return -1;
2107 }
2108 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2109
2110 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2111 return 0;
2112 /*
2113 * Found the referenced task, send to transport for processing.
2114 */
2115 if (se_tmr->call_transport)
2116 return transport_generic_handle_tmr(&cmd->se_cmd);
2117
2118 /*
2119 * Could not find the referenced LUN, task, or Task Management
2120 * command not authorized or supported. Change state and
2121 * let the tx_thread send the response.
2122 *
2123 * For connection recovery, this is also the default action for
2124 * TMR TASK_REASSIGN.
2125 */
2126 if (sess_ref) {
2127 pr_debug("Handle TMR, using sess_ref=true check\n");
2128 target_put_sess_cmd(&cmd->se_cmd);
2129 }
2130
2131 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2132 return 0;
2133 }
2134 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2135
2136 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2137 int
2138 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2139 struct iscsi_text *hdr)
2140 {
2141 u32 payload_length = ntoh24(hdr->dlength);
2142
2143 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2144 pr_err("Unable to accept text parameter length: %u"
2145 "greater than MaxXmitDataSegmentLength %u.\n",
2146 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2147 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2148 (unsigned char *)hdr);
2149 }
2150
2151 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2152 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2153 pr_err("Multi sequence text commands currently not supported\n");
2154 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2155 (unsigned char *)hdr);
2156 }
2157
2158 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2159 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2160 hdr->exp_statsn, payload_length);
2161
2162 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2163 cmd->i_state = ISTATE_SEND_TEXTRSP;
2164 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2165 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2166 cmd->targ_xfer_tag = 0xFFFFFFFF;
2167 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2168 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2169 cmd->data_direction = DMA_NONE;
2170 cmd->text_in_ptr = NULL;
2171
2172 return 0;
2173 }
2174 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2175
2176 int
2177 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2178 struct iscsi_text *hdr)
2179 {
2180 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2181 int cmdsn_ret;
2182
2183 if (!text_in) {
2184 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2185 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2186 pr_err("Unable to locate text_in buffer for sendtargets"
2187 " discovery\n");
2188 goto reject;
2189 }
2190 goto empty_sendtargets;
2191 }
2192 if (strncmp("SendTargets", text_in, 11) != 0) {
2193 pr_err("Received Text Data that is not"
2194 " SendTargets, cannot continue.\n");
2195 goto reject;
2196 }
2197 text_ptr = strchr(text_in, '=');
2198 if (!text_ptr) {
2199 pr_err("No \"=\" separator found in Text Data,"
2200 " cannot continue.\n");
2201 goto reject;
2202 }
2203 if (!strncmp("=All", text_ptr, 4)) {
2204 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2205 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2206 !strncmp("=eui.", text_ptr, 5)) {
2207 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2208 } else {
2209 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2210 goto reject;
2211 }
2212
2213 spin_lock_bh(&conn->cmd_lock);
2214 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2215 spin_unlock_bh(&conn->cmd_lock);
2216
2217 empty_sendtargets:
2218 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2219
2220 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2221 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2222 (unsigned char *)hdr, hdr->cmdsn);
2223 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2224 return -1;
2225
2226 return 0;
2227 }
2228
2229 return iscsit_execute_cmd(cmd, 0);
2230
2231 reject:
2232 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2233 (unsigned char *)hdr);
2234 }
2235 EXPORT_SYMBOL(iscsit_process_text_cmd);
2236
2237 static int
2238 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2239 unsigned char *buf)
2240 {
2241 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2242 char *text_in = NULL;
2243 u32 payload_length = ntoh24(hdr->dlength);
2244 int rx_size, rc;
2245
2246 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2247 if (rc < 0)
2248 return 0;
2249
2250 rx_size = payload_length;
2251 if (payload_length) {
2252 u32 checksum = 0, data_crc = 0;
2253 u32 padding = 0, pad_bytes = 0;
2254 int niov = 0, rx_got;
2255 struct kvec iov[3];
2256
2257 text_in = kzalloc(payload_length, GFP_KERNEL);
2258 if (!text_in)
2259 goto reject;
2260
2261 cmd->text_in_ptr = text_in;
2262
2263 memset(iov, 0, 3 * sizeof(struct kvec));
2264 iov[niov].iov_base = text_in;
2265 iov[niov++].iov_len = payload_length;
2266
2267 padding = ((-payload_length) & 3);
2268 if (padding != 0) {
2269 iov[niov].iov_base = &pad_bytes;
2270 iov[niov++].iov_len = padding;
2271 rx_size += padding;
2272 pr_debug("Receiving %u additional bytes"
2273 " for padding.\n", padding);
2274 }
2275 if (conn->conn_ops->DataDigest) {
2276 iov[niov].iov_base = &checksum;
2277 iov[niov++].iov_len = ISCSI_CRC_LEN;
2278 rx_size += ISCSI_CRC_LEN;
2279 }
2280
2281 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2282 if (rx_got != rx_size)
2283 goto reject;
2284
2285 if (conn->conn_ops->DataDigest) {
2286 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2287 text_in, payload_length,
2288 padding, (u8 *)&pad_bytes,
2289 (u8 *)&data_crc);
2290
2291 if (checksum != data_crc) {
2292 pr_err("Text data CRC32C DataDigest"
2293 " 0x%08x does not match computed"
2294 " 0x%08x\n", checksum, data_crc);
2295 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2296 pr_err("Unable to recover from"
2297 " Text Data digest failure while in"
2298 " ERL=0.\n");
2299 goto reject;
2300 } else {
2301 /*
2302 * Silently drop this PDU and let the
2303 * initiator plug the CmdSN gap.
2304 */
2305 pr_debug("Dropping Text"
2306 " Command CmdSN: 0x%08x due to"
2307 " DataCRC error.\n", hdr->cmdsn);
2308 kfree(text_in);
2309 return 0;
2310 }
2311 } else {
2312 pr_debug("Got CRC32C DataDigest"
2313 " 0x%08x for %u bytes of text data.\n",
2314 checksum, payload_length);
2315 }
2316 }
2317 text_in[payload_length - 1] = '\0';
2318 pr_debug("Successfully read %d bytes of text"
2319 " data.\n", payload_length);
2320 }
2321
2322 return iscsit_process_text_cmd(conn, cmd, hdr);
2323
2324 reject:
2325 kfree(cmd->text_in_ptr);
2326 cmd->text_in_ptr = NULL;
2327 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2328 }
2329
2330 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2331 {
2332 struct iscsi_conn *conn_p;
2333 struct iscsi_session *sess = conn->sess;
2334
2335 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2336 " for SID: %u.\n", conn->cid, conn->sess->sid);
2337
2338 atomic_set(&sess->session_logout, 1);
2339 atomic_set(&conn->conn_logout_remove, 1);
2340 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2341
2342 iscsit_inc_conn_usage_count(conn);
2343 iscsit_inc_session_usage_count(sess);
2344
2345 spin_lock_bh(&sess->conn_lock);
2346 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2347 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2348 continue;
2349
2350 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2351 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2352 }
2353 spin_unlock_bh(&sess->conn_lock);
2354
2355 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2356
2357 return 0;
2358 }
2359
2360 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2361 {
2362 struct iscsi_conn *l_conn;
2363 struct iscsi_session *sess = conn->sess;
2364
2365 pr_debug("Received logout request CLOSECONNECTION for CID:"
2366 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2367
2368 /*
2369 * A Logout Request with a CLOSECONNECTION reason code for a CID
2370 * can arrive on a connection with a differing CID.
2371 */
2372 if (conn->cid == cmd->logout_cid) {
2373 spin_lock_bh(&conn->state_lock);
2374 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2375 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2376
2377 atomic_set(&conn->conn_logout_remove, 1);
2378 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2379 iscsit_inc_conn_usage_count(conn);
2380
2381 spin_unlock_bh(&conn->state_lock);
2382 } else {
2383 /*
2384 * Handle all different cid CLOSECONNECTION requests in
2385 * iscsit_logout_post_handler_diffcid() as to give enough
2386 * time for any non immediate command's CmdSN to be
2387 * acknowledged on the connection in question.
2388 *
2389 * Here we simply make sure the CID is still around.
2390 */
2391 l_conn = iscsit_get_conn_from_cid(sess,
2392 cmd->logout_cid);
2393 if (!l_conn) {
2394 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2395 iscsit_add_cmd_to_response_queue(cmd, conn,
2396 cmd->i_state);
2397 return 0;
2398 }
2399
2400 iscsit_dec_conn_usage_count(l_conn);
2401 }
2402
2403 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2404
2405 return 0;
2406 }
2407
2408 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2409 {
2410 struct iscsi_session *sess = conn->sess;
2411
2412 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2413 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2414
2415 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2416 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2417 " while ERL!=2.\n");
2418 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2419 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2420 return 0;
2421 }
2422
2423 if (conn->cid == cmd->logout_cid) {
2424 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2425 " with CID: %hu on CID: %hu, implementation error.\n",
2426 cmd->logout_cid, conn->cid);
2427 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2428 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2429 return 0;
2430 }
2431
2432 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2433
2434 return 0;
2435 }
2436
2437 int
2438 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2439 unsigned char *buf)
2440 {
2441 int cmdsn_ret, logout_remove = 0;
2442 u8 reason_code = 0;
2443 struct iscsi_logout *hdr;
2444 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2445
2446 hdr = (struct iscsi_logout *) buf;
2447 reason_code = (hdr->flags & 0x7f);
2448
2449 if (tiqn) {
2450 spin_lock(&tiqn->logout_stats.lock);
2451 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2452 tiqn->logout_stats.normal_logouts++;
2453 else
2454 tiqn->logout_stats.abnormal_logouts++;
2455 spin_unlock(&tiqn->logout_stats.lock);
2456 }
2457
2458 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2459 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2460 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2461 hdr->cid, conn->cid);
2462
2463 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2464 pr_err("Received logout request on connection that"
2465 " is not in logged in state, ignoring request.\n");
2466 iscsit_free_cmd(cmd, false);
2467 return 0;
2468 }
2469
2470 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2471 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2472 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2473 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2474 cmd->targ_xfer_tag = 0xFFFFFFFF;
2475 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2476 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2477 cmd->logout_cid = be16_to_cpu(hdr->cid);
2478 cmd->logout_reason = reason_code;
2479 cmd->data_direction = DMA_NONE;
2480
2481 /*
2482 * We need to sleep in these cases (by returning 1) until the Logout
2483 * Response gets sent in the tx thread.
2484 */
2485 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2486 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2487 be16_to_cpu(hdr->cid) == conn->cid))
2488 logout_remove = 1;
2489
2490 spin_lock_bh(&conn->cmd_lock);
2491 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2492 spin_unlock_bh(&conn->cmd_lock);
2493
2494 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2495 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2496
2497 /*
2498 * Immediate commands are executed, well, immediately.
2499 * Non-Immediate Logout Commands are executed in CmdSN order.
2500 */
2501 if (cmd->immediate_cmd) {
2502 int ret = iscsit_execute_cmd(cmd, 0);
2503
2504 if (ret < 0)
2505 return ret;
2506 } else {
2507 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2508 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2509 logout_remove = 0;
2510 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2511 return -1;
2512 }
2513
2514 return logout_remove;
2515 }
2516 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2517
2518 int iscsit_handle_snack(
2519 struct iscsi_conn *conn,
2520 unsigned char *buf)
2521 {
2522 struct iscsi_snack *hdr;
2523
2524 hdr = (struct iscsi_snack *) buf;
2525 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2526
2527 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2528 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2529 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2530 hdr->begrun, hdr->runlength, conn->cid);
2531
2532 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2533 pr_err("Initiator sent SNACK request while in"
2534 " ErrorRecoveryLevel=0.\n");
2535 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2536 buf);
2537 }
2538 /*
2539 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2540 * call from inside iscsi_send_recovery_datain_or_r2t().
2541 */
2542 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2543 case 0:
2544 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2545 hdr->itt,
2546 be32_to_cpu(hdr->ttt),
2547 be32_to_cpu(hdr->begrun),
2548 be32_to_cpu(hdr->runlength));
2549 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2550 return iscsit_handle_status_snack(conn, hdr->itt,
2551 be32_to_cpu(hdr->ttt),
2552 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2553 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2554 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2555 be32_to_cpu(hdr->begrun),
2556 be32_to_cpu(hdr->runlength));
2557 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2558 /* FIXME: Support R-Data SNACK */
2559 pr_err("R-Data SNACK Not Supported.\n");
2560 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2561 buf);
2562 default:
2563 pr_err("Unknown SNACK type 0x%02x, protocol"
2564 " error.\n", hdr->flags & 0x0f);
2565 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2566 buf);
2567 }
2568
2569 return 0;
2570 }
2571 EXPORT_SYMBOL(iscsit_handle_snack);
2572
2573 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2574 {
2575 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2576 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2577 wait_for_completion_interruptible_timeout(
2578 &conn->rx_half_close_comp,
2579 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2580 }
2581 }
2582
2583 static int iscsit_handle_immediate_data(
2584 struct iscsi_cmd *cmd,
2585 struct iscsi_scsi_req *hdr,
2586 u32 length)
2587 {
2588 int iov_ret, rx_got = 0, rx_size = 0;
2589 u32 checksum, iov_count = 0, padding = 0;
2590 struct iscsi_conn *conn = cmd->conn;
2591 struct kvec *iov;
2592
2593 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2594 if (iov_ret < 0)
2595 return IMMEDIATE_DATA_CANNOT_RECOVER;
2596
2597 rx_size = length;
2598 iov_count = iov_ret;
2599 iov = &cmd->iov_data[0];
2600
2601 padding = ((-length) & 3);
2602 if (padding != 0) {
2603 iov[iov_count].iov_base = cmd->pad_bytes;
2604 iov[iov_count++].iov_len = padding;
2605 rx_size += padding;
2606 }
2607
2608 if (conn->conn_ops->DataDigest) {
2609 iov[iov_count].iov_base = &checksum;
2610 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2611 rx_size += ISCSI_CRC_LEN;
2612 }
2613
2614 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2615
2616 iscsit_unmap_iovec(cmd);
2617
2618 if (rx_got != rx_size) {
2619 iscsit_rx_thread_wait_for_tcp(conn);
2620 return IMMEDIATE_DATA_CANNOT_RECOVER;
2621 }
2622
2623 if (conn->conn_ops->DataDigest) {
2624 u32 data_crc;
2625
2626 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2627 cmd->write_data_done, length, padding,
2628 cmd->pad_bytes);
2629
2630 if (checksum != data_crc) {
2631 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2632 " does not match computed 0x%08x\n", checksum,
2633 data_crc);
2634
2635 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2636 pr_err("Unable to recover from"
2637 " Immediate Data digest failure while"
2638 " in ERL=0.\n");
2639 iscsit_reject_cmd(cmd,
2640 ISCSI_REASON_DATA_DIGEST_ERROR,
2641 (unsigned char *)hdr);
2642 return IMMEDIATE_DATA_CANNOT_RECOVER;
2643 } else {
2644 iscsit_reject_cmd(cmd,
2645 ISCSI_REASON_DATA_DIGEST_ERROR,
2646 (unsigned char *)hdr);
2647 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2648 }
2649 } else {
2650 pr_debug("Got CRC32C DataDigest 0x%08x for"
2651 " %u bytes of Immediate Data\n", checksum,
2652 length);
2653 }
2654 }
2655
2656 cmd->write_data_done += length;
2657
2658 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2659 spin_lock_bh(&cmd->istate_lock);
2660 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2661 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2662 spin_unlock_bh(&cmd->istate_lock);
2663 }
2664
2665 return IMMEDIATE_DATA_NORMAL_OPERATION;
2666 }
2667
2668 /*
2669 * Called with sess->conn_lock held.
2670 */
2671 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2672 with active network interface */
2673 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2674 {
2675 struct iscsi_cmd *cmd;
2676 struct iscsi_conn *conn_p;
2677 bool found = false;
2678
2679 /*
2680 * Only send a Asynchronous Message on connections whos network
2681 * interface is still functional.
2682 */
2683 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2684 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2685 iscsit_inc_conn_usage_count(conn_p);
2686 found = true;
2687 break;
2688 }
2689 }
2690
2691 if (!found)
2692 return;
2693
2694 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2695 if (!cmd) {
2696 iscsit_dec_conn_usage_count(conn_p);
2697 return;
2698 }
2699
2700 cmd->logout_cid = conn->cid;
2701 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2702 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2703
2704 spin_lock_bh(&conn_p->cmd_lock);
2705 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2706 spin_unlock_bh(&conn_p->cmd_lock);
2707
2708 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2709 iscsit_dec_conn_usage_count(conn_p);
2710 }
2711
2712 static int iscsit_send_conn_drop_async_message(
2713 struct iscsi_cmd *cmd,
2714 struct iscsi_conn *conn)
2715 {
2716 struct iscsi_async *hdr;
2717
2718 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2719
2720 hdr = (struct iscsi_async *) cmd->pdu;
2721 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2722 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2723 cmd->init_task_tag = RESERVED_ITT;
2724 cmd->targ_xfer_tag = 0xFFFFFFFF;
2725 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2726 cmd->stat_sn = conn->stat_sn++;
2727 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2728 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2729 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2730 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2731 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2732 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2733 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2734
2735 pr_debug("Sending Connection Dropped Async Message StatSN:"
2736 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2737 cmd->logout_cid, conn->cid);
2738
2739 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2740 }
2741
2742 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2743 {
2744 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2745 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2746 wait_for_completion_interruptible_timeout(
2747 &conn->tx_half_close_comp,
2748 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2749 }
2750 }
2751
2752 void
2753 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2754 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2755 bool set_statsn)
2756 {
2757 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2758 hdr->flags = datain->flags;
2759 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2760 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2761 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2762 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2763 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2764 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2765 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2766 }
2767 }
2768 hton24(hdr->dlength, datain->length);
2769 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2770 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2771 (struct scsi_lun *)&hdr->lun);
2772 else
2773 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2774
2775 hdr->itt = cmd->init_task_tag;
2776
2777 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2778 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2779 else
2780 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2781 if (set_statsn)
2782 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2783 else
2784 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2785
2786 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2787 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2788 hdr->datasn = cpu_to_be32(datain->data_sn);
2789 hdr->offset = cpu_to_be32(datain->offset);
2790
2791 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2792 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2793 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2794 ntohl(hdr->offset), datain->length, conn->cid);
2795 }
2796 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2797
2798 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2799 {
2800 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2801 struct iscsi_datain datain;
2802 struct iscsi_datain_req *dr;
2803 int eodr = 0, ret;
2804 bool set_statsn = false;
2805
2806 memset(&datain, 0, sizeof(struct iscsi_datain));
2807 dr = iscsit_get_datain_values(cmd, &datain);
2808 if (!dr) {
2809 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2810 cmd->init_task_tag);
2811 return -1;
2812 }
2813 /*
2814 * Be paranoid and double check the logic for now.
2815 */
2816 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2817 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2818 " datain.length: %u exceeds cmd->data_length: %u\n",
2819 cmd->init_task_tag, datain.offset, datain.length,
2820 cmd->se_cmd.data_length);
2821 return -1;
2822 }
2823
2824 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2825 /*
2826 * Special case for successfully execution w/ both DATAIN
2827 * and Sense Data.
2828 */
2829 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2830 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2831 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2832 else {
2833 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2834 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2835 iscsit_increment_maxcmdsn(cmd, conn->sess);
2836 cmd->stat_sn = conn->stat_sn++;
2837 set_statsn = true;
2838 } else if (dr->dr_complete ==
2839 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2840 set_statsn = true;
2841 }
2842
2843 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2844
2845 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2846 if (ret < 0)
2847 return ret;
2848
2849 if (dr->dr_complete) {
2850 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2851 2 : 1;
2852 iscsit_free_datain_req(cmd, dr);
2853 }
2854
2855 return eodr;
2856 }
2857
2858 int
2859 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2860 struct iscsi_logout_rsp *hdr)
2861 {
2862 struct iscsi_conn *logout_conn = NULL;
2863 struct iscsi_conn_recovery *cr = NULL;
2864 struct iscsi_session *sess = conn->sess;
2865 /*
2866 * The actual shutting down of Sessions and/or Connections
2867 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2868 * is done in scsi_logout_post_handler().
2869 */
2870 switch (cmd->logout_reason) {
2871 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2872 pr_debug("iSCSI session logout successful, setting"
2873 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2874 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2875 break;
2876 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2877 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2878 break;
2879 /*
2880 * For CLOSECONNECTION logout requests carrying
2881 * a matching logout CID -> local CID, the reference
2882 * for the local CID will have been incremented in
2883 * iscsi_logout_closeconnection().
2884 *
2885 * For CLOSECONNECTION logout requests carrying
2886 * a different CID than the connection it arrived
2887 * on, the connection responding to cmd->logout_cid
2888 * is stopped in iscsit_logout_post_handler_diffcid().
2889 */
2890
2891 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2892 " successful.\n", cmd->logout_cid, conn->cid);
2893 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2894 break;
2895 case ISCSI_LOGOUT_REASON_RECOVERY:
2896 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2897 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2898 break;
2899 /*
2900 * If the connection is still active from our point of view
2901 * force connection recovery to occur.
2902 */
2903 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2904 cmd->logout_cid);
2905 if (logout_conn) {
2906 iscsit_connection_reinstatement_rcfr(logout_conn);
2907 iscsit_dec_conn_usage_count(logout_conn);
2908 }
2909
2910 cr = iscsit_get_inactive_connection_recovery_entry(
2911 conn->sess, cmd->logout_cid);
2912 if (!cr) {
2913 pr_err("Unable to locate CID: %hu for"
2914 " REMOVECONNFORRECOVERY Logout Request.\n",
2915 cmd->logout_cid);
2916 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2917 break;
2918 }
2919
2920 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2921
2922 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2923 " for recovery for CID: %hu on CID: %hu successful.\n",
2924 cmd->logout_cid, conn->cid);
2925 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2926 break;
2927 default:
2928 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2929 cmd->logout_reason);
2930 return -1;
2931 }
2932
2933 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2934 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2935 hdr->response = cmd->logout_response;
2936 hdr->itt = cmd->init_task_tag;
2937 cmd->stat_sn = conn->stat_sn++;
2938 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2939
2940 iscsit_increment_maxcmdsn(cmd, conn->sess);
2941 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2942 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2943
2944 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2945 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2946 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2947 cmd->logout_cid, conn->cid);
2948
2949 return 0;
2950 }
2951 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2952
2953 static int
2954 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2955 {
2956 int rc;
2957
2958 rc = iscsit_build_logout_rsp(cmd, conn,
2959 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2960 if (rc < 0)
2961 return rc;
2962
2963 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2964 }
2965
2966 void
2967 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2968 struct iscsi_nopin *hdr, bool nopout_response)
2969 {
2970 hdr->opcode = ISCSI_OP_NOOP_IN;
2971 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2972 hton24(hdr->dlength, cmd->buf_ptr_size);
2973 if (nopout_response)
2974 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2975 hdr->itt = cmd->init_task_tag;
2976 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2977 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2978 conn->stat_sn;
2979 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2980
2981 if (nopout_response)
2982 iscsit_increment_maxcmdsn(cmd, conn->sess);
2983
2984 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2985 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2986
2987 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2988 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2989 "Solicited" : "Unsolicited", cmd->init_task_tag,
2990 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2991 }
2992 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2993
2994 /*
2995 * Unsolicited NOPIN, either requesting a response or not.
2996 */
2997 static int iscsit_send_unsolicited_nopin(
2998 struct iscsi_cmd *cmd,
2999 struct iscsi_conn *conn,
3000 int want_response)
3001 {
3002 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3003 int ret;
3004
3005 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3006
3007 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3008 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3009
3010 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3011 if (ret < 0)
3012 return ret;
3013
3014 spin_lock_bh(&cmd->istate_lock);
3015 cmd->i_state = want_response ?
3016 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3017 spin_unlock_bh(&cmd->istate_lock);
3018
3019 return 0;
3020 }
3021
3022 static int
3023 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3024 {
3025 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3026
3027 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3028
3029 /*
3030 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3031 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3032 */
3033 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3034
3035 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3036 cmd->buf_ptr,
3037 cmd->buf_ptr_size);
3038 }
3039
3040 static int iscsit_send_r2t(
3041 struct iscsi_cmd *cmd,
3042 struct iscsi_conn *conn)
3043 {
3044 struct iscsi_r2t *r2t;
3045 struct iscsi_r2t_rsp *hdr;
3046 int ret;
3047
3048 r2t = iscsit_get_r2t_from_list(cmd);
3049 if (!r2t)
3050 return -1;
3051
3052 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3053 memset(hdr, 0, ISCSI_HDR_LEN);
3054 hdr->opcode = ISCSI_OP_R2T;
3055 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3056 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3057 (struct scsi_lun *)&hdr->lun);
3058 hdr->itt = cmd->init_task_tag;
3059 if (conn->conn_transport->iscsit_get_r2t_ttt)
3060 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3061 else
3062 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3063 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3064 hdr->statsn = cpu_to_be32(conn->stat_sn);
3065 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3066 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3067 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3068 hdr->data_offset = cpu_to_be32(r2t->offset);
3069 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3070
3071 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3072 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3073 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3074 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3075 r2t->offset, r2t->xfer_len, conn->cid);
3076
3077 spin_lock_bh(&cmd->r2t_lock);
3078 r2t->sent_r2t = 1;
3079 spin_unlock_bh(&cmd->r2t_lock);
3080
3081 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3082 if (ret < 0) {
3083 return ret;
3084 }
3085
3086 spin_lock_bh(&cmd->dataout_timeout_lock);
3087 iscsit_start_dataout_timer(cmd, conn);
3088 spin_unlock_bh(&cmd->dataout_timeout_lock);
3089
3090 return 0;
3091 }
3092
3093 /*
3094 * @recovery: If called from iscsi_task_reassign_complete_write() for
3095 * connection recovery.
3096 */
3097 int iscsit_build_r2ts_for_cmd(
3098 struct iscsi_conn *conn,
3099 struct iscsi_cmd *cmd,
3100 bool recovery)
3101 {
3102 int first_r2t = 1;
3103 u32 offset = 0, xfer_len = 0;
3104
3105 spin_lock_bh(&cmd->r2t_lock);
3106 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3107 spin_unlock_bh(&cmd->r2t_lock);
3108 return 0;
3109 }
3110
3111 if (conn->sess->sess_ops->DataSequenceInOrder &&
3112 !recovery)
3113 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3114
3115 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3116 if (conn->sess->sess_ops->DataSequenceInOrder) {
3117 offset = cmd->r2t_offset;
3118
3119 if (first_r2t && recovery) {
3120 int new_data_end = offset +
3121 conn->sess->sess_ops->MaxBurstLength -
3122 cmd->next_burst_len;
3123
3124 if (new_data_end > cmd->se_cmd.data_length)
3125 xfer_len = cmd->se_cmd.data_length - offset;
3126 else
3127 xfer_len =
3128 conn->sess->sess_ops->MaxBurstLength -
3129 cmd->next_burst_len;
3130 } else {
3131 int new_data_end = offset +
3132 conn->sess->sess_ops->MaxBurstLength;
3133
3134 if (new_data_end > cmd->se_cmd.data_length)
3135 xfer_len = cmd->se_cmd.data_length - offset;
3136 else
3137 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3138 }
3139 cmd->r2t_offset += xfer_len;
3140
3141 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3142 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3143 } else {
3144 struct iscsi_seq *seq;
3145
3146 seq = iscsit_get_seq_holder_for_r2t(cmd);
3147 if (!seq) {
3148 spin_unlock_bh(&cmd->r2t_lock);
3149 return -1;
3150 }
3151
3152 offset = seq->offset;
3153 xfer_len = seq->xfer_len;
3154
3155 if (cmd->seq_send_order == cmd->seq_count)
3156 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3157 }
3158 cmd->outstanding_r2ts++;
3159 first_r2t = 0;
3160
3161 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3162 spin_unlock_bh(&cmd->r2t_lock);
3163 return -1;
3164 }
3165
3166 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3167 break;
3168 }
3169 spin_unlock_bh(&cmd->r2t_lock);
3170
3171 return 0;
3172 }
3173 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3174
3175 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3176 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3177 {
3178 if (inc_stat_sn)
3179 cmd->stat_sn = conn->stat_sn++;
3180
3181 atomic_long_inc(&conn->sess->rsp_pdus);
3182
3183 memset(hdr, 0, ISCSI_HDR_LEN);
3184 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3185 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3186 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3187 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3188 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3189 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3190 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3191 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3192 }
3193 hdr->response = cmd->iscsi_response;
3194 hdr->cmd_status = cmd->se_cmd.scsi_status;
3195 hdr->itt = cmd->init_task_tag;
3196 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3197
3198 iscsit_increment_maxcmdsn(cmd, conn->sess);
3199 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3200 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3201
3202 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3203 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3204 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3205 cmd->se_cmd.scsi_status, conn->cid);
3206 }
3207 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3208
3209 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3210 {
3211 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3212 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3213 void *data_buf = NULL;
3214 u32 padding = 0, data_buf_len = 0;
3215
3216 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3217
3218 /*
3219 * Attach SENSE DATA payload to iSCSI Response PDU
3220 */
3221 if (cmd->se_cmd.sense_buffer &&
3222 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3223 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3224 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3225 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3226
3227 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3228 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3229 data_buf = cmd->sense_buffer;
3230 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3231
3232 if (padding) {
3233 memset(cmd->sense_buffer +
3234 cmd->se_cmd.scsi_sense_length, 0, padding);
3235 pr_debug("Adding %u bytes of padding to"
3236 " SENSE.\n", padding);
3237 }
3238
3239 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3240 " Response PDU\n",
3241 cmd->se_cmd.scsi_sense_length);
3242 }
3243
3244 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3245 data_buf_len);
3246 }
3247
3248 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3249 {
3250 switch (se_tmr->response) {
3251 case TMR_FUNCTION_COMPLETE:
3252 return ISCSI_TMF_RSP_COMPLETE;
3253 case TMR_TASK_DOES_NOT_EXIST:
3254 return ISCSI_TMF_RSP_NO_TASK;
3255 case TMR_LUN_DOES_NOT_EXIST:
3256 return ISCSI_TMF_RSP_NO_LUN;
3257 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3258 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3259 case TMR_FUNCTION_REJECTED:
3260 default:
3261 return ISCSI_TMF_RSP_REJECTED;
3262 }
3263 }
3264
3265 void
3266 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3267 struct iscsi_tm_rsp *hdr)
3268 {
3269 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3270
3271 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3272 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3273 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3274 hdr->itt = cmd->init_task_tag;
3275 cmd->stat_sn = conn->stat_sn++;
3276 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3277
3278 iscsit_increment_maxcmdsn(cmd, conn->sess);
3279 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3280 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3281
3282 pr_debug("Built Task Management Response ITT: 0x%08x,"
3283 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3284 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3285 }
3286 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3287
3288 static int
3289 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3290 {
3291 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3292
3293 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3294
3295 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3296 }
3297
3298 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3299 {
3300 bool ret = false;
3301
3302 if (np->np_sockaddr.ss_family == AF_INET6) {
3303 const struct sockaddr_in6 sin6 = {
3304 .sin6_addr = IN6ADDR_ANY_INIT };
3305 struct sockaddr_in6 *sock_in6 =
3306 (struct sockaddr_in6 *)&np->np_sockaddr;
3307
3308 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3309 sin6.sin6_addr.s6_addr, 16))
3310 ret = true;
3311 } else {
3312 struct sockaddr_in * sock_in =
3313 (struct sockaddr_in *)&np->np_sockaddr;
3314
3315 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3316 ret = true;
3317 }
3318
3319 return ret;
3320 }
3321
3322 #define SENDTARGETS_BUF_LIMIT 32768U
3323
3324 static int
3325 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3326 enum iscsit_transport_type network_transport,
3327 int skip_bytes, bool *completed)
3328 {
3329 char *payload = NULL;
3330 struct iscsi_conn *conn = cmd->conn;
3331 struct iscsi_portal_group *tpg;
3332 struct iscsi_tiqn *tiqn;
3333 struct iscsi_tpg_np *tpg_np;
3334 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3335 int target_name_printed;
3336 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3337 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3338 bool active;
3339
3340 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3341 SENDTARGETS_BUF_LIMIT);
3342
3343 payload = kzalloc(buffer_len, GFP_KERNEL);
3344 if (!payload)
3345 return -ENOMEM;
3346
3347 /*
3348 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3349 * explicit case..
3350 */
3351 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3352 text_ptr = strchr(text_in, '=');
3353 if (!text_ptr) {
3354 pr_err("Unable to locate '=' string in text_in:"
3355 " %s\n", text_in);
3356 kfree(payload);
3357 return -EINVAL;
3358 }
3359 /*
3360 * Skip over '=' character..
3361 */
3362 text_ptr += 1;
3363 }
3364
3365 spin_lock(&tiqn_lock);
3366 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3367 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3368 strcmp(tiqn->tiqn, text_ptr)) {
3369 continue;
3370 }
3371
3372 target_name_printed = 0;
3373
3374 spin_lock(&tiqn->tiqn_tpg_lock);
3375 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3376
3377 /* If demo_mode_discovery=0 and generate_node_acls=0
3378 * (demo mode dislabed) do not return
3379 * TargetName+TargetAddress unless a NodeACL exists.
3380 */
3381
3382 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3383 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3384 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3385 cmd->conn->sess->sess_ops->InitiatorName))) {
3386 continue;
3387 }
3388
3389 spin_lock(&tpg->tpg_state_lock);
3390 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3391 spin_unlock(&tpg->tpg_state_lock);
3392
3393 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3394 continue;
3395
3396 spin_lock(&tpg->tpg_np_lock);
3397 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3398 tpg_np_list) {
3399 struct iscsi_np *np = tpg_np->tpg_np;
3400 bool inaddr_any = iscsit_check_inaddr_any(np);
3401 struct sockaddr_storage *sockaddr;
3402
3403 if (np->np_network_transport != network_transport)
3404 continue;
3405
3406 if (!target_name_printed) {
3407 len = sprintf(buf, "TargetName=%s",
3408 tiqn->tiqn);
3409 len += 1;
3410
3411 if ((len + payload_len) > buffer_len) {
3412 spin_unlock(&tpg->tpg_np_lock);
3413 spin_unlock(&tiqn->tiqn_tpg_lock);
3414 end_of_buf = 1;
3415 goto eob;
3416 }
3417
3418 if (skip_bytes && len <= skip_bytes) {
3419 skip_bytes -= len;
3420 } else {
3421 memcpy(payload + payload_len, buf, len);
3422 payload_len += len;
3423 target_name_printed = 1;
3424 if (len > skip_bytes)
3425 skip_bytes = 0;
3426 }
3427 }
3428
3429 if (inaddr_any)
3430 sockaddr = &conn->local_sockaddr;
3431 else
3432 sockaddr = &np->np_sockaddr;
3433
3434 len = sprintf(buf, "TargetAddress="
3435 "%pISpc,%hu",
3436 sockaddr,
3437 tpg->tpgt);
3438 len += 1;
3439
3440 if ((len + payload_len) > buffer_len) {
3441 spin_unlock(&tpg->tpg_np_lock);
3442 spin_unlock(&tiqn->tiqn_tpg_lock);
3443 end_of_buf = 1;
3444 goto eob;
3445 }
3446
3447 if (skip_bytes && len <= skip_bytes) {
3448 skip_bytes -= len;
3449 } else {
3450 memcpy(payload + payload_len, buf, len);
3451 payload_len += len;
3452 if (len > skip_bytes)
3453 skip_bytes = 0;
3454 }
3455 }
3456 spin_unlock(&tpg->tpg_np_lock);
3457 }
3458 spin_unlock(&tiqn->tiqn_tpg_lock);
3459 eob:
3460 if (end_of_buf) {
3461 *completed = false;
3462 break;
3463 }
3464
3465 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3466 break;
3467 }
3468 spin_unlock(&tiqn_lock);
3469
3470 cmd->buf_ptr = payload;
3471
3472 return payload_len;
3473 }
3474
3475 int
3476 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3477 struct iscsi_text_rsp *hdr,
3478 enum iscsit_transport_type network_transport)
3479 {
3480 int text_length, padding;
3481 bool completed = true;
3482
3483 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3484 cmd->read_data_done,
3485 &completed);
3486 if (text_length < 0)
3487 return text_length;
3488
3489 if (completed) {
3490 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3491 } else {
3492 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3493 cmd->read_data_done += text_length;
3494 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3495 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3496 }
3497 hdr->opcode = ISCSI_OP_TEXT_RSP;
3498 padding = ((-text_length) & 3);
3499 hton24(hdr->dlength, text_length);
3500 hdr->itt = cmd->init_task_tag;
3501 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3502 cmd->stat_sn = conn->stat_sn++;
3503 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3504
3505 iscsit_increment_maxcmdsn(cmd, conn->sess);
3506 /*
3507 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3508 * correctly increment MaxCmdSN for each response answering a
3509 * non immediate text request with a valid CmdSN.
3510 */
3511 cmd->maxcmdsn_inc = 0;
3512 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3513 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3514
3515 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3516 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3517 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3518 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3519 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3520
3521 return text_length + padding;
3522 }
3523 EXPORT_SYMBOL(iscsit_build_text_rsp);
3524
3525 static int iscsit_send_text_rsp(
3526 struct iscsi_cmd *cmd,
3527 struct iscsi_conn *conn)
3528 {
3529 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3530 int text_length;
3531
3532 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3533 conn->conn_transport->transport_type);
3534 if (text_length < 0)
3535 return text_length;
3536
3537 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3538 cmd->buf_ptr,
3539 text_length);
3540 }
3541
3542 void
3543 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3544 struct iscsi_reject *hdr)
3545 {
3546 hdr->opcode = ISCSI_OP_REJECT;
3547 hdr->reason = cmd->reject_reason;
3548 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3549 hton24(hdr->dlength, ISCSI_HDR_LEN);
3550 hdr->ffffffff = cpu_to_be32(0xffffffff);
3551 cmd->stat_sn = conn->stat_sn++;
3552 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3553 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3554 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3555
3556 }
3557 EXPORT_SYMBOL(iscsit_build_reject);
3558
3559 static int iscsit_send_reject(
3560 struct iscsi_cmd *cmd,
3561 struct iscsi_conn *conn)
3562 {
3563 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3564
3565 iscsit_build_reject(cmd, conn, hdr);
3566
3567 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3568 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3569
3570 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3571 cmd->buf_ptr,
3572 ISCSI_HDR_LEN);
3573 }
3574
3575 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3576 {
3577 int ord, cpu;
3578 /*
3579 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3580 * within iscsit_start_kthreads()
3581 *
3582 * Here we use bitmap_id to determine which CPU that this
3583 * iSCSI connection's RX/TX threads will be scheduled to
3584 * execute upon.
3585 */
3586 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3587 for_each_online_cpu(cpu) {
3588 if (ord-- == 0) {
3589 cpumask_set_cpu(cpu, conn->conn_cpumask);
3590 return;
3591 }
3592 }
3593 /*
3594 * This should never be reached..
3595 */
3596 dump_stack();
3597 cpumask_setall(conn->conn_cpumask);
3598 }
3599
3600 int
3601 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3602 {
3603 int ret;
3604
3605 switch (state) {
3606 case ISTATE_SEND_R2T:
3607 ret = iscsit_send_r2t(cmd, conn);
3608 if (ret < 0)
3609 goto err;
3610 break;
3611 case ISTATE_REMOVE:
3612 spin_lock_bh(&conn->cmd_lock);
3613 list_del_init(&cmd->i_conn_node);
3614 spin_unlock_bh(&conn->cmd_lock);
3615
3616 iscsit_free_cmd(cmd, false);
3617 break;
3618 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3619 iscsit_mod_nopin_response_timer(conn);
3620 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3621 if (ret < 0)
3622 goto err;
3623 break;
3624 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3625 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3626 if (ret < 0)
3627 goto err;
3628 break;
3629 default:
3630 pr_err("Unknown Opcode: 0x%02x ITT:"
3631 " 0x%08x, i_state: %d on CID: %hu\n",
3632 cmd->iscsi_opcode, cmd->init_task_tag, state,
3633 conn->cid);
3634 goto err;
3635 }
3636
3637 return 0;
3638
3639 err:
3640 return -1;
3641 }
3642 EXPORT_SYMBOL(iscsit_immediate_queue);
3643
3644 static int
3645 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3646 {
3647 struct iscsit_transport *t = conn->conn_transport;
3648 struct iscsi_queue_req *qr;
3649 struct iscsi_cmd *cmd;
3650 u8 state;
3651 int ret;
3652
3653 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3654 atomic_set(&conn->check_immediate_queue, 0);
3655 cmd = qr->cmd;
3656 state = qr->state;
3657 kmem_cache_free(lio_qr_cache, qr);
3658
3659 ret = t->iscsit_immediate_queue(conn, cmd, state);
3660 if (ret < 0)
3661 return ret;
3662 }
3663
3664 return 0;
3665 }
3666
3667 int
3668 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3669 {
3670 int ret;
3671
3672 check_rsp_state:
3673 switch (state) {
3674 case ISTATE_SEND_DATAIN:
3675 ret = iscsit_send_datain(cmd, conn);
3676 if (ret < 0)
3677 goto err;
3678 else if (!ret)
3679 /* more drs */
3680 goto check_rsp_state;
3681 else if (ret == 1) {
3682 /* all done */
3683 spin_lock_bh(&cmd->istate_lock);
3684 cmd->i_state = ISTATE_SENT_STATUS;
3685 spin_unlock_bh(&cmd->istate_lock);
3686
3687 if (atomic_read(&conn->check_immediate_queue))
3688 return 1;
3689
3690 return 0;
3691 } else if (ret == 2) {
3692 /* Still must send status,
3693 SCF_TRANSPORT_TASK_SENSE was set */
3694 spin_lock_bh(&cmd->istate_lock);
3695 cmd->i_state = ISTATE_SEND_STATUS;
3696 spin_unlock_bh(&cmd->istate_lock);
3697 state = ISTATE_SEND_STATUS;
3698 goto check_rsp_state;
3699 }
3700
3701 break;
3702 case ISTATE_SEND_STATUS:
3703 case ISTATE_SEND_STATUS_RECOVERY:
3704 ret = iscsit_send_response(cmd, conn);
3705 break;
3706 case ISTATE_SEND_LOGOUTRSP:
3707 ret = iscsit_send_logout(cmd, conn);
3708 break;
3709 case ISTATE_SEND_ASYNCMSG:
3710 ret = iscsit_send_conn_drop_async_message(
3711 cmd, conn);
3712 break;
3713 case ISTATE_SEND_NOPIN:
3714 ret = iscsit_send_nopin(cmd, conn);
3715 break;
3716 case ISTATE_SEND_REJECT:
3717 ret = iscsit_send_reject(cmd, conn);
3718 break;
3719 case ISTATE_SEND_TASKMGTRSP:
3720 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3721 if (ret != 0)
3722 break;
3723 ret = iscsit_tmr_post_handler(cmd, conn);
3724 if (ret != 0)
3725 iscsit_fall_back_to_erl0(conn->sess);
3726 break;
3727 case ISTATE_SEND_TEXTRSP:
3728 ret = iscsit_send_text_rsp(cmd, conn);
3729 break;
3730 default:
3731 pr_err("Unknown Opcode: 0x%02x ITT:"
3732 " 0x%08x, i_state: %d on CID: %hu\n",
3733 cmd->iscsi_opcode, cmd->init_task_tag,
3734 state, conn->cid);
3735 goto err;
3736 }
3737 if (ret < 0)
3738 goto err;
3739
3740 switch (state) {
3741 case ISTATE_SEND_LOGOUTRSP:
3742 if (!iscsit_logout_post_handler(cmd, conn))
3743 return -ECONNRESET;
3744 /* fall through */
3745 case ISTATE_SEND_STATUS:
3746 case ISTATE_SEND_ASYNCMSG:
3747 case ISTATE_SEND_NOPIN:
3748 case ISTATE_SEND_STATUS_RECOVERY:
3749 case ISTATE_SEND_TEXTRSP:
3750 case ISTATE_SEND_TASKMGTRSP:
3751 case ISTATE_SEND_REJECT:
3752 spin_lock_bh(&cmd->istate_lock);
3753 cmd->i_state = ISTATE_SENT_STATUS;
3754 spin_unlock_bh(&cmd->istate_lock);
3755 break;
3756 default:
3757 pr_err("Unknown Opcode: 0x%02x ITT:"
3758 " 0x%08x, i_state: %d on CID: %hu\n",
3759 cmd->iscsi_opcode, cmd->init_task_tag,
3760 cmd->i_state, conn->cid);
3761 goto err;
3762 }
3763
3764 if (atomic_read(&conn->check_immediate_queue))
3765 return 1;
3766
3767 return 0;
3768
3769 err:
3770 return -1;
3771 }
3772 EXPORT_SYMBOL(iscsit_response_queue);
3773
3774 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3775 {
3776 struct iscsit_transport *t = conn->conn_transport;
3777 struct iscsi_queue_req *qr;
3778 struct iscsi_cmd *cmd;
3779 u8 state;
3780 int ret;
3781
3782 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3783 cmd = qr->cmd;
3784 state = qr->state;
3785 kmem_cache_free(lio_qr_cache, qr);
3786
3787 ret = t->iscsit_response_queue(conn, cmd, state);
3788 if (ret == 1 || ret < 0)
3789 return ret;
3790 }
3791
3792 return 0;
3793 }
3794
3795 int iscsi_target_tx_thread(void *arg)
3796 {
3797 int ret = 0;
3798 struct iscsi_conn *conn = arg;
3799 bool conn_freed = false;
3800
3801 /*
3802 * Allow ourselves to be interrupted by SIGINT so that a
3803 * connection recovery / failure event can be triggered externally.
3804 */
3805 allow_signal(SIGINT);
3806
3807 while (!kthread_should_stop()) {
3808 /*
3809 * Ensure that both TX and RX per connection kthreads
3810 * are scheduled to run on the same CPU.
3811 */
3812 iscsit_thread_check_cpumask(conn, current, 1);
3813
3814 wait_event_interruptible(conn->queues_wq,
3815 !iscsit_conn_all_queues_empty(conn));
3816
3817 if (signal_pending(current))
3818 goto transport_err;
3819
3820 get_immediate:
3821 ret = iscsit_handle_immediate_queue(conn);
3822 if (ret < 0)
3823 goto transport_err;
3824
3825 ret = iscsit_handle_response_queue(conn);
3826 if (ret == 1) {
3827 goto get_immediate;
3828 } else if (ret == -ECONNRESET) {
3829 conn_freed = true;
3830 goto out;
3831 } else if (ret < 0) {
3832 goto transport_err;
3833 }
3834 }
3835
3836 transport_err:
3837 /*
3838 * Avoid the normal connection failure code-path if this connection
3839 * is still within LOGIN mode, and iscsi_np process context is
3840 * responsible for cleaning up the early connection failure.
3841 */
3842 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3843 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3844 out:
3845 if (!conn_freed) {
3846 while (!kthread_should_stop()) {
3847 msleep(100);
3848 }
3849 }
3850 return 0;
3851 }
3852
3853 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3854 {
3855 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3856 struct iscsi_cmd *cmd;
3857 int ret = 0;
3858
3859 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3860 case ISCSI_OP_SCSI_CMD:
3861 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3862 if (!cmd)
3863 goto reject;
3864
3865 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3866 break;
3867 case ISCSI_OP_SCSI_DATA_OUT:
3868 ret = iscsit_handle_data_out(conn, buf);
3869 break;
3870 case ISCSI_OP_NOOP_OUT:
3871 cmd = NULL;
3872 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3873 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3874 if (!cmd)
3875 goto reject;
3876 }
3877 ret = iscsit_handle_nop_out(conn, cmd, buf);
3878 break;
3879 case ISCSI_OP_SCSI_TMFUNC:
3880 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3881 if (!cmd)
3882 goto reject;
3883
3884 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3885 break;
3886 case ISCSI_OP_TEXT:
3887 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3888 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3889 if (!cmd)
3890 goto reject;
3891 } else {
3892 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3893 if (!cmd)
3894 goto reject;
3895 }
3896
3897 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3898 break;
3899 case ISCSI_OP_LOGOUT:
3900 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3901 if (!cmd)
3902 goto reject;
3903
3904 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3905 if (ret > 0)
3906 wait_for_completion_timeout(&conn->conn_logout_comp,
3907 SECONDS_FOR_LOGOUT_COMP * HZ);
3908 break;
3909 case ISCSI_OP_SNACK:
3910 ret = iscsit_handle_snack(conn, buf);
3911 break;
3912 default:
3913 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3914 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3915 pr_err("Cannot recover from unknown"
3916 " opcode while ERL=0, closing iSCSI connection.\n");
3917 return -1;
3918 }
3919 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3920 " closing iSCSI connection.\n");
3921 ret = -1;
3922 break;
3923 }
3924
3925 return ret;
3926 reject:
3927 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3928 }
3929
3930 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3931 {
3932 bool ret;
3933
3934 spin_lock_bh(&conn->state_lock);
3935 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3936 spin_unlock_bh(&conn->state_lock);
3937
3938 return ret;
3939 }
3940
3941 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3942 {
3943 int ret;
3944 u8 buffer[ISCSI_HDR_LEN], opcode;
3945 u32 checksum = 0, digest = 0;
3946 struct kvec iov;
3947
3948 while (!kthread_should_stop()) {
3949 /*
3950 * Ensure that both TX and RX per connection kthreads
3951 * are scheduled to run on the same CPU.
3952 */
3953 iscsit_thread_check_cpumask(conn, current, 0);
3954
3955 memset(buffer, 0, ISCSI_HDR_LEN);
3956 memset(&iov, 0, sizeof(struct kvec));
3957
3958 iov.iov_base = buffer;
3959 iov.iov_len = ISCSI_HDR_LEN;
3960
3961 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3962 if (ret != ISCSI_HDR_LEN) {
3963 iscsit_rx_thread_wait_for_tcp(conn);
3964 return;
3965 }
3966
3967 if (conn->conn_ops->HeaderDigest) {
3968 iov.iov_base = &digest;
3969 iov.iov_len = ISCSI_CRC_LEN;
3970
3971 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3972 if (ret != ISCSI_CRC_LEN) {
3973 iscsit_rx_thread_wait_for_tcp(conn);
3974 return;
3975 }
3976
3977 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3978 buffer, ISCSI_HDR_LEN,
3979 0, NULL, (u8 *)&checksum);
3980
3981 if (digest != checksum) {
3982 pr_err("HeaderDigest CRC32C failed,"
3983 " received 0x%08x, computed 0x%08x\n",
3984 digest, checksum);
3985 /*
3986 * Set the PDU to 0xff so it will intentionally
3987 * hit default in the switch below.
3988 */
3989 memset(buffer, 0xff, ISCSI_HDR_LEN);
3990 atomic_long_inc(&conn->sess->conn_digest_errors);
3991 } else {
3992 pr_debug("Got HeaderDigest CRC32C"
3993 " 0x%08x\n", checksum);
3994 }
3995 }
3996
3997 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3998 return;
3999
4000 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4001
4002 if (conn->sess->sess_ops->SessionType &&
4003 ((!(opcode & ISCSI_OP_TEXT)) ||
4004 (!(opcode & ISCSI_OP_LOGOUT)))) {
4005 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4006 " while in Discovery Session, rejecting.\n", opcode);
4007 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4008 buffer);
4009 return;
4010 }
4011
4012 ret = iscsi_target_rx_opcode(conn, buffer);
4013 if (ret < 0)
4014 return;
4015 }
4016 }
4017
4018 int iscsi_target_rx_thread(void *arg)
4019 {
4020 int rc;
4021 struct iscsi_conn *conn = arg;
4022 bool conn_freed = false;
4023
4024 /*
4025 * Allow ourselves to be interrupted by SIGINT so that a
4026 * connection recovery / failure event can be triggered externally.
4027 */
4028 allow_signal(SIGINT);
4029 /*
4030 * Wait for iscsi_post_login_handler() to complete before allowing
4031 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4032 */
4033 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4034 if (rc < 0 || iscsi_target_check_conn_state(conn))
4035 goto out;
4036
4037 if (!conn->conn_transport->iscsit_get_rx_pdu)
4038 return 0;
4039
4040 conn->conn_transport->iscsit_get_rx_pdu(conn);
4041
4042 if (!signal_pending(current))
4043 atomic_set(&conn->transport_failed, 1);
4044 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4045
4046 out:
4047 if (!conn_freed) {
4048 while (!kthread_should_stop()) {
4049 msleep(100);
4050 }
4051 }
4052
4053 return 0;
4054 }
4055
4056 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4057 {
4058 LIST_HEAD(tmp_list);
4059 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4060 struct iscsi_session *sess = conn->sess;
4061 /*
4062 * We expect this function to only ever be called from either RX or TX
4063 * thread context via iscsit_close_connection() once the other context
4064 * has been reset -> returned sleeping pre-handler state.
4065 */
4066 spin_lock_bh(&conn->cmd_lock);
4067 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4068
4069 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4070 struct se_cmd *se_cmd = &cmd->se_cmd;
4071
4072 if (se_cmd->se_tfo != NULL) {
4073 spin_lock(&se_cmd->t_state_lock);
4074 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4075 spin_unlock(&se_cmd->t_state_lock);
4076 }
4077 }
4078 spin_unlock_bh(&conn->cmd_lock);
4079
4080 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4081 list_del_init(&cmd->i_conn_node);
4082
4083 iscsit_increment_maxcmdsn(cmd, sess);
4084 iscsit_free_cmd(cmd, true);
4085
4086 }
4087 }
4088
4089 static void iscsit_stop_timers_for_cmds(
4090 struct iscsi_conn *conn)
4091 {
4092 struct iscsi_cmd *cmd;
4093
4094 spin_lock_bh(&conn->cmd_lock);
4095 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4096 if (cmd->data_direction == DMA_TO_DEVICE)
4097 iscsit_stop_dataout_timer(cmd);
4098 }
4099 spin_unlock_bh(&conn->cmd_lock);
4100 }
4101
4102 int iscsit_close_connection(
4103 struct iscsi_conn *conn)
4104 {
4105 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4106 struct iscsi_session *sess = conn->sess;
4107
4108 pr_debug("Closing iSCSI connection CID %hu on SID:"
4109 " %u\n", conn->cid, sess->sid);
4110 /*
4111 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4112 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4113 * sleeping and the logout response never got sent because the
4114 * connection failed.
4115 *
4116 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4117 * to signal logout response TX interrupt completion. Go ahead and skip
4118 * this for iser since isert_rx_opcode() does not wait on logout failure,
4119 * and to avoid iscsi_conn pointer dereference in iser-target code.
4120 */
4121 if (!conn->conn_transport->rdma_shutdown)
4122 complete(&conn->conn_logout_comp);
4123
4124 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4125 if (conn->tx_thread &&
4126 cmpxchg(&conn->tx_thread_active, true, false)) {
4127 send_sig(SIGINT, conn->tx_thread, 1);
4128 kthread_stop(conn->tx_thread);
4129 }
4130 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4131 if (conn->rx_thread &&
4132 cmpxchg(&conn->rx_thread_active, true, false)) {
4133 send_sig(SIGINT, conn->rx_thread, 1);
4134 kthread_stop(conn->rx_thread);
4135 }
4136 }
4137
4138 spin_lock(&iscsit_global->ts_bitmap_lock);
4139 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4140 get_order(1));
4141 spin_unlock(&iscsit_global->ts_bitmap_lock);
4142
4143 iscsit_stop_timers_for_cmds(conn);
4144 iscsit_stop_nopin_response_timer(conn);
4145 iscsit_stop_nopin_timer(conn);
4146
4147 if (conn->conn_transport->iscsit_wait_conn)
4148 conn->conn_transport->iscsit_wait_conn(conn);
4149
4150 /*
4151 * During Connection recovery drop unacknowledged out of order
4152 * commands for this connection, and prepare the other commands
4153 * for reallegiance.
4154 *
4155 * During normal operation clear the out of order commands (but
4156 * do not free the struct iscsi_ooo_cmdsn's) and release all
4157 * struct iscsi_cmds.
4158 */
4159 if (atomic_read(&conn->connection_recovery)) {
4160 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4161 iscsit_prepare_cmds_for_reallegiance(conn);
4162 } else {
4163 iscsit_clear_ooo_cmdsns_for_conn(conn);
4164 iscsit_release_commands_from_conn(conn);
4165 }
4166 iscsit_free_queue_reqs_for_conn(conn);
4167
4168 /*
4169 * Handle decrementing session or connection usage count if
4170 * a logout response was not able to be sent because the
4171 * connection failed. Fall back to Session Recovery here.
4172 */
4173 if (atomic_read(&conn->conn_logout_remove)) {
4174 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4175 iscsit_dec_conn_usage_count(conn);
4176 iscsit_dec_session_usage_count(sess);
4177 }
4178 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4179 iscsit_dec_conn_usage_count(conn);
4180
4181 atomic_set(&conn->conn_logout_remove, 0);
4182 atomic_set(&sess->session_reinstatement, 0);
4183 atomic_set(&sess->session_fall_back_to_erl0, 1);
4184 }
4185
4186 spin_lock_bh(&sess->conn_lock);
4187 list_del(&conn->conn_list);
4188
4189 /*
4190 * Attempt to let the Initiator know this connection failed by
4191 * sending an Connection Dropped Async Message on another
4192 * active connection.
4193 */
4194 if (atomic_read(&conn->connection_recovery))
4195 iscsit_build_conn_drop_async_message(conn);
4196
4197 spin_unlock_bh(&sess->conn_lock);
4198
4199 /*
4200 * If connection reinstatement is being performed on this connection,
4201 * up the connection reinstatement semaphore that is being blocked on
4202 * in iscsit_cause_connection_reinstatement().
4203 */
4204 spin_lock_bh(&conn->state_lock);
4205 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4206 spin_unlock_bh(&conn->state_lock);
4207 complete(&conn->conn_wait_comp);
4208 wait_for_completion(&conn->conn_post_wait_comp);
4209 spin_lock_bh(&conn->state_lock);
4210 }
4211
4212 /*
4213 * If connection reinstatement is being performed on this connection
4214 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4215 * connection wait rcfr semaphore that is being blocked on
4216 * an iscsit_connection_reinstatement_rcfr().
4217 */
4218 if (atomic_read(&conn->connection_wait_rcfr)) {
4219 spin_unlock_bh(&conn->state_lock);
4220 complete(&conn->conn_wait_rcfr_comp);
4221 wait_for_completion(&conn->conn_post_wait_comp);
4222 spin_lock_bh(&conn->state_lock);
4223 }
4224 atomic_set(&conn->connection_reinstatement, 1);
4225 spin_unlock_bh(&conn->state_lock);
4226
4227 /*
4228 * If any other processes are accessing this connection pointer we
4229 * must wait until they have completed.
4230 */
4231 iscsit_check_conn_usage_count(conn);
4232
4233 ahash_request_free(conn->conn_tx_hash);
4234 if (conn->conn_rx_hash) {
4235 struct crypto_ahash *tfm;
4236
4237 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4238 ahash_request_free(conn->conn_rx_hash);
4239 crypto_free_ahash(tfm);
4240 }
4241
4242 free_cpumask_var(conn->conn_cpumask);
4243
4244 kfree(conn->conn_ops);
4245 conn->conn_ops = NULL;
4246
4247 if (conn->sock)
4248 sock_release(conn->sock);
4249
4250 if (conn->conn_transport->iscsit_free_conn)
4251 conn->conn_transport->iscsit_free_conn(conn);
4252
4253 iscsit_put_transport(conn->conn_transport);
4254
4255 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4256 conn->conn_state = TARG_CONN_STATE_FREE;
4257 kfree(conn);
4258
4259 spin_lock_bh(&sess->conn_lock);
4260 atomic_dec(&sess->nconn);
4261 pr_debug("Decremented iSCSI connection count to %hu from node:"
4262 " %s\n", atomic_read(&sess->nconn),
4263 sess->sess_ops->InitiatorName);
4264 /*
4265 * Make sure that if one connection fails in an non ERL=2 iSCSI
4266 * Session that they all fail.
4267 */
4268 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4269 !atomic_read(&sess->session_logout))
4270 atomic_set(&sess->session_fall_back_to_erl0, 1);
4271
4272 /*
4273 * If this was not the last connection in the session, and we are
4274 * performing session reinstatement or falling back to ERL=0, call
4275 * iscsit_stop_session() without sleeping to shutdown the other
4276 * active connections.
4277 */
4278 if (atomic_read(&sess->nconn)) {
4279 if (!atomic_read(&sess->session_reinstatement) &&
4280 !atomic_read(&sess->session_fall_back_to_erl0)) {
4281 spin_unlock_bh(&sess->conn_lock);
4282 return 0;
4283 }
4284 if (!atomic_read(&sess->session_stop_active)) {
4285 atomic_set(&sess->session_stop_active, 1);
4286 spin_unlock_bh(&sess->conn_lock);
4287 iscsit_stop_session(sess, 0, 0);
4288 return 0;
4289 }
4290 spin_unlock_bh(&sess->conn_lock);
4291 return 0;
4292 }
4293
4294 /*
4295 * If this was the last connection in the session and one of the
4296 * following is occurring:
4297 *
4298 * Session Reinstatement is not being performed, and are falling back
4299 * to ERL=0 call iscsit_close_session().
4300 *
4301 * Session Logout was requested. iscsit_close_session() will be called
4302 * elsewhere.
4303 *
4304 * Session Continuation is not being performed, start the Time2Retain
4305 * handler and check if sleep_on_sess_wait_sem is active.
4306 */
4307 if (!atomic_read(&sess->session_reinstatement) &&
4308 atomic_read(&sess->session_fall_back_to_erl0)) {
4309 spin_unlock_bh(&sess->conn_lock);
4310 iscsit_close_session(sess);
4311
4312 return 0;
4313 } else if (atomic_read(&sess->session_logout)) {
4314 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4315 sess->session_state = TARG_SESS_STATE_FREE;
4316 spin_unlock_bh(&sess->conn_lock);
4317
4318 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4319 complete(&sess->session_wait_comp);
4320
4321 return 0;
4322 } else {
4323 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4324 sess->session_state = TARG_SESS_STATE_FAILED;
4325
4326 if (!atomic_read(&sess->session_continuation)) {
4327 spin_unlock_bh(&sess->conn_lock);
4328 iscsit_start_time2retain_handler(sess);
4329 } else
4330 spin_unlock_bh(&sess->conn_lock);
4331
4332 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4333 complete(&sess->session_wait_comp);
4334
4335 return 0;
4336 }
4337 }
4338
4339 /*
4340 * If the iSCSI Session for the iSCSI Initiator Node exists,
4341 * forcefully shutdown the iSCSI NEXUS.
4342 */
4343 int iscsit_close_session(struct iscsi_session *sess)
4344 {
4345 struct iscsi_portal_group *tpg = sess->tpg;
4346 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4347
4348 if (atomic_read(&sess->nconn)) {
4349 pr_err("%d connection(s) still exist for iSCSI session"
4350 " to %s\n", atomic_read(&sess->nconn),
4351 sess->sess_ops->InitiatorName);
4352 BUG();
4353 }
4354
4355 spin_lock_bh(&se_tpg->session_lock);
4356 atomic_set(&sess->session_logout, 1);
4357 atomic_set(&sess->session_reinstatement, 1);
4358 iscsit_stop_time2retain_timer(sess);
4359 spin_unlock_bh(&se_tpg->session_lock);
4360
4361 /*
4362 * transport_deregister_session_configfs() will clear the
4363 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4364 * can be setting it again with __transport_register_session() in
4365 * iscsi_post_login_handler() again after the iscsit_stop_session()
4366 * completes in iscsi_np context.
4367 */
4368 transport_deregister_session_configfs(sess->se_sess);
4369
4370 /*
4371 * If any other processes are accessing this session pointer we must
4372 * wait until they have completed. If we are in an interrupt (the
4373 * time2retain handler) and contain and active session usage count we
4374 * restart the timer and exit.
4375 */
4376 if (!in_interrupt()) {
4377 if (iscsit_check_session_usage_count(sess) == 1)
4378 iscsit_stop_session(sess, 1, 1);
4379 } else {
4380 if (iscsit_check_session_usage_count(sess) == 2) {
4381 atomic_set(&sess->session_logout, 0);
4382 iscsit_start_time2retain_handler(sess);
4383 return 0;
4384 }
4385 }
4386
4387 transport_deregister_session(sess->se_sess);
4388
4389 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4390 iscsit_free_connection_recovery_entires(sess);
4391
4392 iscsit_free_all_ooo_cmdsns(sess);
4393
4394 spin_lock_bh(&se_tpg->session_lock);
4395 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4396 sess->session_state = TARG_SESS_STATE_FREE;
4397 pr_debug("Released iSCSI session from node: %s\n",
4398 sess->sess_ops->InitiatorName);
4399 tpg->nsessions--;
4400 if (tpg->tpg_tiqn)
4401 tpg->tpg_tiqn->tiqn_nsessions--;
4402
4403 pr_debug("Decremented number of active iSCSI Sessions on"
4404 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4405
4406 spin_lock(&sess_idr_lock);
4407 idr_remove(&sess_idr, sess->session_index);
4408 spin_unlock(&sess_idr_lock);
4409
4410 kfree(sess->sess_ops);
4411 sess->sess_ops = NULL;
4412 spin_unlock_bh(&se_tpg->session_lock);
4413
4414 kfree(sess);
4415 return 0;
4416 }
4417
4418 static void iscsit_logout_post_handler_closesession(
4419 struct iscsi_conn *conn)
4420 {
4421 struct iscsi_session *sess = conn->sess;
4422 int sleep = 1;
4423 /*
4424 * Traditional iscsi/tcp will invoke this logic from TX thread
4425 * context during session logout, so clear tx_thread_active and
4426 * sleep if iscsit_close_connection() has not already occured.
4427 *
4428 * Since iser-target invokes this logic from it's own workqueue,
4429 * always sleep waiting for RX/TX thread shutdown to complete
4430 * within iscsit_close_connection().
4431 */
4432 if (!conn->conn_transport->rdma_shutdown) {
4433 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4434 if (!sleep)
4435 return;
4436 }
4437
4438 atomic_set(&conn->conn_logout_remove, 0);
4439 complete(&conn->conn_logout_comp);
4440
4441 iscsit_dec_conn_usage_count(conn);
4442 iscsit_stop_session(sess, sleep, sleep);
4443 iscsit_dec_session_usage_count(sess);
4444 iscsit_close_session(sess);
4445 }
4446
4447 static void iscsit_logout_post_handler_samecid(
4448 struct iscsi_conn *conn)
4449 {
4450 int sleep = 1;
4451
4452 if (!conn->conn_transport->rdma_shutdown) {
4453 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4454 if (!sleep)
4455 return;
4456 }
4457
4458 atomic_set(&conn->conn_logout_remove, 0);
4459 complete(&conn->conn_logout_comp);
4460
4461 iscsit_cause_connection_reinstatement(conn, sleep);
4462 iscsit_dec_conn_usage_count(conn);
4463 }
4464
4465 static void iscsit_logout_post_handler_diffcid(
4466 struct iscsi_conn *conn,
4467 u16 cid)
4468 {
4469 struct iscsi_conn *l_conn;
4470 struct iscsi_session *sess = conn->sess;
4471 bool conn_found = false;
4472
4473 if (!sess)
4474 return;
4475
4476 spin_lock_bh(&sess->conn_lock);
4477 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4478 if (l_conn->cid == cid) {
4479 iscsit_inc_conn_usage_count(l_conn);
4480 conn_found = true;
4481 break;
4482 }
4483 }
4484 spin_unlock_bh(&sess->conn_lock);
4485
4486 if (!conn_found)
4487 return;
4488
4489 if (l_conn->sock)
4490 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4491
4492 spin_lock_bh(&l_conn->state_lock);
4493 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4494 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4495 spin_unlock_bh(&l_conn->state_lock);
4496
4497 iscsit_cause_connection_reinstatement(l_conn, 1);
4498 iscsit_dec_conn_usage_count(l_conn);
4499 }
4500
4501 /*
4502 * Return of 0 causes the TX thread to restart.
4503 */
4504 int iscsit_logout_post_handler(
4505 struct iscsi_cmd *cmd,
4506 struct iscsi_conn *conn)
4507 {
4508 int ret = 0;
4509
4510 switch (cmd->logout_reason) {
4511 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4512 switch (cmd->logout_response) {
4513 case ISCSI_LOGOUT_SUCCESS:
4514 case ISCSI_LOGOUT_CLEANUP_FAILED:
4515 default:
4516 iscsit_logout_post_handler_closesession(conn);
4517 break;
4518 }
4519 ret = 0;
4520 break;
4521 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4522 if (conn->cid == cmd->logout_cid) {
4523 switch (cmd->logout_response) {
4524 case ISCSI_LOGOUT_SUCCESS:
4525 case ISCSI_LOGOUT_CLEANUP_FAILED:
4526 default:
4527 iscsit_logout_post_handler_samecid(conn);
4528 break;
4529 }
4530 ret = 0;
4531 } else {
4532 switch (cmd->logout_response) {
4533 case ISCSI_LOGOUT_SUCCESS:
4534 iscsit_logout_post_handler_diffcid(conn,
4535 cmd->logout_cid);
4536 break;
4537 case ISCSI_LOGOUT_CID_NOT_FOUND:
4538 case ISCSI_LOGOUT_CLEANUP_FAILED:
4539 default:
4540 break;
4541 }
4542 ret = 1;
4543 }
4544 break;
4545 case ISCSI_LOGOUT_REASON_RECOVERY:
4546 switch (cmd->logout_response) {
4547 case ISCSI_LOGOUT_SUCCESS:
4548 case ISCSI_LOGOUT_CID_NOT_FOUND:
4549 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4550 case ISCSI_LOGOUT_CLEANUP_FAILED:
4551 default:
4552 break;
4553 }
4554 ret = 1;
4555 break;
4556 default:
4557 break;
4558
4559 }
4560 return ret;
4561 }
4562 EXPORT_SYMBOL(iscsit_logout_post_handler);
4563
4564 void iscsit_fail_session(struct iscsi_session *sess)
4565 {
4566 struct iscsi_conn *conn;
4567
4568 spin_lock_bh(&sess->conn_lock);
4569 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4570 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4571 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4572 }
4573 spin_unlock_bh(&sess->conn_lock);
4574
4575 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4576 sess->session_state = TARG_SESS_STATE_FAILED;
4577 }
4578
4579 int iscsit_free_session(struct iscsi_session *sess)
4580 {
4581 u16 conn_count = atomic_read(&sess->nconn);
4582 struct iscsi_conn *conn, *conn_tmp = NULL;
4583 int is_last;
4584
4585 spin_lock_bh(&sess->conn_lock);
4586 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4587
4588 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4589 conn_list) {
4590 if (conn_count == 0)
4591 break;
4592
4593 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4594 is_last = 1;
4595 } else {
4596 iscsit_inc_conn_usage_count(conn_tmp);
4597 is_last = 0;
4598 }
4599 iscsit_inc_conn_usage_count(conn);
4600
4601 spin_unlock_bh(&sess->conn_lock);
4602 iscsit_cause_connection_reinstatement(conn, 1);
4603 spin_lock_bh(&sess->conn_lock);
4604
4605 iscsit_dec_conn_usage_count(conn);
4606 if (is_last == 0)
4607 iscsit_dec_conn_usage_count(conn_tmp);
4608
4609 conn_count--;
4610 }
4611
4612 if (atomic_read(&sess->nconn)) {
4613 spin_unlock_bh(&sess->conn_lock);
4614 wait_for_completion(&sess->session_wait_comp);
4615 } else
4616 spin_unlock_bh(&sess->conn_lock);
4617
4618 iscsit_close_session(sess);
4619 return 0;
4620 }
4621
4622 void iscsit_stop_session(
4623 struct iscsi_session *sess,
4624 int session_sleep,
4625 int connection_sleep)
4626 {
4627 u16 conn_count = atomic_read(&sess->nconn);
4628 struct iscsi_conn *conn, *conn_tmp = NULL;
4629 int is_last;
4630
4631 spin_lock_bh(&sess->conn_lock);
4632 if (session_sleep)
4633 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4634
4635 if (connection_sleep) {
4636 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4637 conn_list) {
4638 if (conn_count == 0)
4639 break;
4640
4641 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4642 is_last = 1;
4643 } else {
4644 iscsit_inc_conn_usage_count(conn_tmp);
4645 is_last = 0;
4646 }
4647 iscsit_inc_conn_usage_count(conn);
4648
4649 spin_unlock_bh(&sess->conn_lock);
4650 iscsit_cause_connection_reinstatement(conn, 1);
4651 spin_lock_bh(&sess->conn_lock);
4652
4653 iscsit_dec_conn_usage_count(conn);
4654 if (is_last == 0)
4655 iscsit_dec_conn_usage_count(conn_tmp);
4656 conn_count--;
4657 }
4658 } else {
4659 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4660 iscsit_cause_connection_reinstatement(conn, 0);
4661 }
4662
4663 if (session_sleep && atomic_read(&sess->nconn)) {
4664 spin_unlock_bh(&sess->conn_lock);
4665 wait_for_completion(&sess->session_wait_comp);
4666 } else
4667 spin_unlock_bh(&sess->conn_lock);
4668 }
4669
4670 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4671 {
4672 struct iscsi_session *sess;
4673 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4674 struct se_session *se_sess, *se_sess_tmp;
4675 LIST_HEAD(free_list);
4676 int session_count = 0;
4677
4678 spin_lock_bh(&se_tpg->session_lock);
4679 if (tpg->nsessions && !force) {
4680 spin_unlock_bh(&se_tpg->session_lock);
4681 return -1;
4682 }
4683
4684 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4685 sess_list) {
4686 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4687
4688 spin_lock(&sess->conn_lock);
4689 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4690 atomic_read(&sess->session_logout) ||
4691 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4692 spin_unlock(&sess->conn_lock);
4693 continue;
4694 }
4695 atomic_set(&sess->session_reinstatement, 1);
4696 atomic_set(&sess->session_fall_back_to_erl0, 1);
4697 spin_unlock(&sess->conn_lock);
4698
4699 list_move_tail(&se_sess->sess_list, &free_list);
4700 }
4701 spin_unlock_bh(&se_tpg->session_lock);
4702
4703 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4704 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4705
4706 iscsit_free_session(sess);
4707 session_count++;
4708 }
4709
4710 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4711 " Group: %hu\n", session_count, tpg->tpgt);
4712 return 0;
4713 }
4714
4715 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4716 MODULE_VERSION("4.1.x");
4717 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4718 MODULE_LICENSE("GPL");
4719
4720 module_init(iscsi_target_init_module);
4721 module_exit(iscsi_target_cleanup_module);
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