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