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Merge tag 'mmc-v4.15-2' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
[mirror_ubuntu-bionic-kernel.git] / drivers / target / iscsi / iscsi_target.c
1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19 #include <crypto/hash.h>
20 #include <linux/string.h>
21 #include <linux/kthread.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
25 #include <linux/idr.h>
26 #include <linux/delay.h>
27 #include <linux/sched/signal.h>
28 #include <asm/unaligned.h>
29 #include <net/ipv6.h>
30 #include <scsi/scsi_proto.h>
31 #include <scsi/iscsi_proto.h>
32 #include <scsi/scsi_tcq.h>
33 #include <target/target_core_base.h>
34 #include <target/target_core_fabric.h>
35
36 #include <target/iscsi/iscsi_target_core.h>
37 #include "iscsi_target_parameters.h"
38 #include "iscsi_target_seq_pdu_list.h"
39 #include "iscsi_target_datain_values.h"
40 #include "iscsi_target_erl0.h"
41 #include "iscsi_target_erl1.h"
42 #include "iscsi_target_erl2.h"
43 #include "iscsi_target_login.h"
44 #include "iscsi_target_tmr.h"
45 #include "iscsi_target_tpg.h"
46 #include "iscsi_target_util.h"
47 #include "iscsi_target.h"
48 #include "iscsi_target_device.h"
49 #include <target/iscsi/iscsi_target_stat.h>
50
51 #include <target/iscsi/iscsi_transport.h>
52
53 static LIST_HEAD(g_tiqn_list);
54 static LIST_HEAD(g_np_list);
55 static DEFINE_SPINLOCK(tiqn_lock);
56 static DEFINE_MUTEX(np_lock);
57
58 static struct idr tiqn_idr;
59 struct idr sess_idr;
60 struct mutex auth_id_lock;
61 spinlock_t sess_idr_lock;
62
63 struct iscsit_global *iscsit_global;
64
65 struct kmem_cache *lio_qr_cache;
66 struct kmem_cache *lio_dr_cache;
67 struct kmem_cache *lio_ooo_cache;
68 struct kmem_cache *lio_r2t_cache;
69
70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
71 struct iscsi_scsi_req *, u32);
72
73 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
74 {
75 struct iscsi_tiqn *tiqn = NULL;
76
77 spin_lock(&tiqn_lock);
78 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
79 if (!strcmp(tiqn->tiqn, buf)) {
80
81 spin_lock(&tiqn->tiqn_state_lock);
82 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
83 tiqn->tiqn_access_count++;
84 spin_unlock(&tiqn->tiqn_state_lock);
85 spin_unlock(&tiqn_lock);
86 return tiqn;
87 }
88 spin_unlock(&tiqn->tiqn_state_lock);
89 }
90 }
91 spin_unlock(&tiqn_lock);
92
93 return NULL;
94 }
95
96 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
97 {
98 spin_lock(&tiqn->tiqn_state_lock);
99 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
100 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
101 spin_unlock(&tiqn->tiqn_state_lock);
102 return 0;
103 }
104 spin_unlock(&tiqn->tiqn_state_lock);
105
106 return -1;
107 }
108
109 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
110 {
111 spin_lock(&tiqn->tiqn_state_lock);
112 tiqn->tiqn_access_count--;
113 spin_unlock(&tiqn->tiqn_state_lock);
114 }
115
116 /*
117 * Note that IQN formatting is expected to be done in userspace, and
118 * no explict IQN format checks are done here.
119 */
120 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
121 {
122 struct iscsi_tiqn *tiqn = NULL;
123 int ret;
124
125 if (strlen(buf) >= ISCSI_IQN_LEN) {
126 pr_err("Target IQN exceeds %d bytes\n",
127 ISCSI_IQN_LEN);
128 return ERR_PTR(-EINVAL);
129 }
130
131 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
132 if (!tiqn)
133 return ERR_PTR(-ENOMEM);
134
135 sprintf(tiqn->tiqn, "%s", buf);
136 INIT_LIST_HEAD(&tiqn->tiqn_list);
137 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
138 spin_lock_init(&tiqn->tiqn_state_lock);
139 spin_lock_init(&tiqn->tiqn_tpg_lock);
140 spin_lock_init(&tiqn->sess_err_stats.lock);
141 spin_lock_init(&tiqn->login_stats.lock);
142 spin_lock_init(&tiqn->logout_stats.lock);
143
144 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
145
146 idr_preload(GFP_KERNEL);
147 spin_lock(&tiqn_lock);
148
149 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
150 if (ret < 0) {
151 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
152 spin_unlock(&tiqn_lock);
153 idr_preload_end();
154 kfree(tiqn);
155 return ERR_PTR(ret);
156 }
157 tiqn->tiqn_index = ret;
158 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
159
160 spin_unlock(&tiqn_lock);
161 idr_preload_end();
162
163 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
164
165 return tiqn;
166
167 }
168
169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
170 {
171 /*
172 * Wait for accesses to said struct iscsi_tiqn to end.
173 */
174 spin_lock(&tiqn->tiqn_state_lock);
175 while (tiqn->tiqn_access_count != 0) {
176 spin_unlock(&tiqn->tiqn_state_lock);
177 msleep(10);
178 spin_lock(&tiqn->tiqn_state_lock);
179 }
180 spin_unlock(&tiqn->tiqn_state_lock);
181 }
182
183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
184 {
185 /*
186 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
187 * while holding tiqn->tiqn_state_lock. This means that all subsequent
188 * attempts to access this struct iscsi_tiqn will fail from both transport
189 * fabric and control code paths.
190 */
191 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
192 pr_err("iscsit_set_tiqn_shutdown() failed\n");
193 return;
194 }
195
196 iscsit_wait_for_tiqn(tiqn);
197
198 spin_lock(&tiqn_lock);
199 list_del(&tiqn->tiqn_list);
200 idr_remove(&tiqn_idr, tiqn->tiqn_index);
201 spin_unlock(&tiqn_lock);
202
203 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
204 tiqn->tiqn);
205 kfree(tiqn);
206 }
207
208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
209 {
210 int ret;
211 /*
212 * Determine if the network portal is accepting storage traffic.
213 */
214 spin_lock_bh(&np->np_thread_lock);
215 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
216 spin_unlock_bh(&np->np_thread_lock);
217 return -1;
218 }
219 spin_unlock_bh(&np->np_thread_lock);
220 /*
221 * Determine if the portal group is accepting storage traffic.
222 */
223 spin_lock_bh(&tpg->tpg_state_lock);
224 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
225 spin_unlock_bh(&tpg->tpg_state_lock);
226 return -1;
227 }
228 spin_unlock_bh(&tpg->tpg_state_lock);
229
230 /*
231 * Here we serialize access across the TIQN+TPG Tuple.
232 */
233 ret = down_interruptible(&tpg->np_login_sem);
234 if (ret != 0)
235 return -1;
236
237 spin_lock_bh(&tpg->tpg_state_lock);
238 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
239 spin_unlock_bh(&tpg->tpg_state_lock);
240 up(&tpg->np_login_sem);
241 return -1;
242 }
243 spin_unlock_bh(&tpg->tpg_state_lock);
244
245 return 0;
246 }
247
248 void iscsit_login_kref_put(struct kref *kref)
249 {
250 struct iscsi_tpg_np *tpg_np = container_of(kref,
251 struct iscsi_tpg_np, tpg_np_kref);
252
253 complete(&tpg_np->tpg_np_comp);
254 }
255
256 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
257 struct iscsi_tpg_np *tpg_np)
258 {
259 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
260
261 up(&tpg->np_login_sem);
262
263 if (tpg_np)
264 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
265
266 if (tiqn)
267 iscsit_put_tiqn_for_login(tiqn);
268
269 return 0;
270 }
271
272 bool iscsit_check_np_match(
273 struct sockaddr_storage *sockaddr,
274 struct iscsi_np *np,
275 int network_transport)
276 {
277 struct sockaddr_in *sock_in, *sock_in_e;
278 struct sockaddr_in6 *sock_in6, *sock_in6_e;
279 bool ip_match = false;
280 u16 port, port_e;
281
282 if (sockaddr->ss_family == AF_INET6) {
283 sock_in6 = (struct sockaddr_in6 *)sockaddr;
284 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
285
286 if (!memcmp(&sock_in6->sin6_addr.in6_u,
287 &sock_in6_e->sin6_addr.in6_u,
288 sizeof(struct in6_addr)))
289 ip_match = true;
290
291 port = ntohs(sock_in6->sin6_port);
292 port_e = ntohs(sock_in6_e->sin6_port);
293 } else {
294 sock_in = (struct sockaddr_in *)sockaddr;
295 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
296
297 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
298 ip_match = true;
299
300 port = ntohs(sock_in->sin_port);
301 port_e = ntohs(sock_in_e->sin_port);
302 }
303
304 if (ip_match && (port_e == port) &&
305 (np->np_network_transport == network_transport))
306 return true;
307
308 return false;
309 }
310
311 /*
312 * Called with mutex np_lock held
313 */
314 static struct iscsi_np *iscsit_get_np(
315 struct sockaddr_storage *sockaddr,
316 int network_transport)
317 {
318 struct iscsi_np *np;
319 bool match;
320
321 list_for_each_entry(np, &g_np_list, np_list) {
322 spin_lock_bh(&np->np_thread_lock);
323 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
324 spin_unlock_bh(&np->np_thread_lock);
325 continue;
326 }
327
328 match = iscsit_check_np_match(sockaddr, np, network_transport);
329 if (match) {
330 /*
331 * Increment the np_exports reference count now to
332 * prevent iscsit_del_np() below from being called
333 * while iscsi_tpg_add_network_portal() is called.
334 */
335 np->np_exports++;
336 spin_unlock_bh(&np->np_thread_lock);
337 return np;
338 }
339 spin_unlock_bh(&np->np_thread_lock);
340 }
341
342 return NULL;
343 }
344
345 struct iscsi_np *iscsit_add_np(
346 struct sockaddr_storage *sockaddr,
347 int network_transport)
348 {
349 struct iscsi_np *np;
350 int ret;
351
352 mutex_lock(&np_lock);
353
354 /*
355 * Locate the existing struct iscsi_np if already active..
356 */
357 np = iscsit_get_np(sockaddr, network_transport);
358 if (np) {
359 mutex_unlock(&np_lock);
360 return np;
361 }
362
363 np = kzalloc(sizeof(*np), GFP_KERNEL);
364 if (!np) {
365 mutex_unlock(&np_lock);
366 return ERR_PTR(-ENOMEM);
367 }
368
369 np->np_flags |= NPF_IP_NETWORK;
370 np->np_network_transport = network_transport;
371 spin_lock_init(&np->np_thread_lock);
372 init_completion(&np->np_restart_comp);
373 INIT_LIST_HEAD(&np->np_list);
374
375 timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
376
377 ret = iscsi_target_setup_login_socket(np, sockaddr);
378 if (ret != 0) {
379 kfree(np);
380 mutex_unlock(&np_lock);
381 return ERR_PTR(ret);
382 }
383
384 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
385 if (IS_ERR(np->np_thread)) {
386 pr_err("Unable to create kthread: iscsi_np\n");
387 ret = PTR_ERR(np->np_thread);
388 kfree(np);
389 mutex_unlock(&np_lock);
390 return ERR_PTR(ret);
391 }
392 /*
393 * Increment the np_exports reference count now to prevent
394 * iscsit_del_np() below from being run while a new call to
395 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
396 * active. We don't need to hold np->np_thread_lock at this
397 * point because iscsi_np has not been added to g_np_list yet.
398 */
399 np->np_exports = 1;
400 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
401
402 list_add_tail(&np->np_list, &g_np_list);
403 mutex_unlock(&np_lock);
404
405 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
406 &np->np_sockaddr, np->np_transport->name);
407
408 return np;
409 }
410
411 int iscsit_reset_np_thread(
412 struct iscsi_np *np,
413 struct iscsi_tpg_np *tpg_np,
414 struct iscsi_portal_group *tpg,
415 bool shutdown)
416 {
417 spin_lock_bh(&np->np_thread_lock);
418 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
419 spin_unlock_bh(&np->np_thread_lock);
420 return 0;
421 }
422 np->np_thread_state = ISCSI_NP_THREAD_RESET;
423 atomic_inc(&np->np_reset_count);
424
425 if (np->np_thread) {
426 spin_unlock_bh(&np->np_thread_lock);
427 send_sig(SIGINT, np->np_thread, 1);
428 wait_for_completion(&np->np_restart_comp);
429 spin_lock_bh(&np->np_thread_lock);
430 }
431 spin_unlock_bh(&np->np_thread_lock);
432
433 if (tpg_np && shutdown) {
434 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
435
436 wait_for_completion(&tpg_np->tpg_np_comp);
437 }
438
439 return 0;
440 }
441
442 static void iscsit_free_np(struct iscsi_np *np)
443 {
444 if (np->np_socket)
445 sock_release(np->np_socket);
446 }
447
448 int iscsit_del_np(struct iscsi_np *np)
449 {
450 spin_lock_bh(&np->np_thread_lock);
451 np->np_exports--;
452 if (np->np_exports) {
453 np->enabled = true;
454 spin_unlock_bh(&np->np_thread_lock);
455 return 0;
456 }
457 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
458 spin_unlock_bh(&np->np_thread_lock);
459
460 if (np->np_thread) {
461 /*
462 * We need to send the signal to wakeup Linux/Net
463 * which may be sleeping in sock_accept()..
464 */
465 send_sig(SIGINT, np->np_thread, 1);
466 kthread_stop(np->np_thread);
467 np->np_thread = NULL;
468 }
469
470 np->np_transport->iscsit_free_np(np);
471
472 mutex_lock(&np_lock);
473 list_del(&np->np_list);
474 mutex_unlock(&np_lock);
475
476 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
477 &np->np_sockaddr, np->np_transport->name);
478
479 iscsit_put_transport(np->np_transport);
480 kfree(np);
481 return 0;
482 }
483
484 static void iscsit_get_rx_pdu(struct iscsi_conn *);
485
486 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
487 {
488 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
489 }
490 EXPORT_SYMBOL(iscsit_queue_rsp);
491
492 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
493 {
494 spin_lock_bh(&conn->cmd_lock);
495 if (!list_empty(&cmd->i_conn_node) &&
496 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
497 list_del_init(&cmd->i_conn_node);
498 spin_unlock_bh(&conn->cmd_lock);
499
500 __iscsit_free_cmd(cmd, true);
501 }
502 EXPORT_SYMBOL(iscsit_aborted_task);
503
504 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
505 u32, u32, const void *, void *);
506 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
507
508 static int
509 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
510 const void *data_buf, u32 data_buf_len)
511 {
512 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
513 struct kvec *iov;
514 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
515 int ret;
516
517 iov = &cmd->iov_misc[0];
518 iov[niov].iov_base = cmd->pdu;
519 iov[niov++].iov_len = ISCSI_HDR_LEN;
520
521 if (conn->conn_ops->HeaderDigest) {
522 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
523
524 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
525 ISCSI_HDR_LEN, 0, NULL,
526 header_digest);
527
528 iov[0].iov_len += ISCSI_CRC_LEN;
529 tx_size += ISCSI_CRC_LEN;
530 pr_debug("Attaching CRC32C HeaderDigest"
531 " to opcode 0x%x 0x%08x\n",
532 hdr->opcode, *header_digest);
533 }
534
535 if (data_buf_len) {
536 u32 padding = ((-data_buf_len) & 3);
537
538 iov[niov].iov_base = (void *)data_buf;
539 iov[niov++].iov_len = data_buf_len;
540 tx_size += data_buf_len;
541
542 if (padding != 0) {
543 iov[niov].iov_base = &cmd->pad_bytes;
544 iov[niov++].iov_len = padding;
545 tx_size += padding;
546 pr_debug("Attaching %u additional"
547 " padding bytes.\n", padding);
548 }
549
550 if (conn->conn_ops->DataDigest) {
551 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
552 data_buf, data_buf_len,
553 padding, &cmd->pad_bytes,
554 &cmd->data_crc);
555
556 iov[niov].iov_base = &cmd->data_crc;
557 iov[niov++].iov_len = ISCSI_CRC_LEN;
558 tx_size += ISCSI_CRC_LEN;
559 pr_debug("Attached DataDigest for %u"
560 " bytes opcode 0x%x, CRC 0x%08x\n",
561 data_buf_len, hdr->opcode, cmd->data_crc);
562 }
563 }
564
565 cmd->iov_misc_count = niov;
566 cmd->tx_size = tx_size;
567
568 ret = iscsit_send_tx_data(cmd, conn, 1);
569 if (ret < 0) {
570 iscsit_tx_thread_wait_for_tcp(conn);
571 return ret;
572 }
573
574 return 0;
575 }
576
577 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
578 static void iscsit_unmap_iovec(struct iscsi_cmd *);
579 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
580 u32, u32, u32, u8 *);
581 static int
582 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
583 const struct iscsi_datain *datain)
584 {
585 struct kvec *iov;
586 u32 iov_count = 0, tx_size = 0;
587 int ret, iov_ret;
588
589 iov = &cmd->iov_data[0];
590 iov[iov_count].iov_base = cmd->pdu;
591 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
592 tx_size += ISCSI_HDR_LEN;
593
594 if (conn->conn_ops->HeaderDigest) {
595 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
596
597 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
598 ISCSI_HDR_LEN, 0, NULL,
599 header_digest);
600
601 iov[0].iov_len += ISCSI_CRC_LEN;
602 tx_size += ISCSI_CRC_LEN;
603
604 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
605 *header_digest);
606 }
607
608 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
609 datain->offset, datain->length);
610 if (iov_ret < 0)
611 return -1;
612
613 iov_count += iov_ret;
614 tx_size += datain->length;
615
616 cmd->padding = ((-datain->length) & 3);
617 if (cmd->padding) {
618 iov[iov_count].iov_base = cmd->pad_bytes;
619 iov[iov_count++].iov_len = cmd->padding;
620 tx_size += cmd->padding;
621
622 pr_debug("Attaching %u padding bytes\n", cmd->padding);
623 }
624
625 if (conn->conn_ops->DataDigest) {
626 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
627 cmd, datain->offset,
628 datain->length,
629 cmd->padding,
630 cmd->pad_bytes);
631
632 iov[iov_count].iov_base = &cmd->data_crc;
633 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
634 tx_size += ISCSI_CRC_LEN;
635
636 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
637 datain->length + cmd->padding, cmd->data_crc);
638 }
639
640 cmd->iov_data_count = iov_count;
641 cmd->tx_size = tx_size;
642
643 ret = iscsit_fe_sendpage_sg(cmd, conn);
644
645 iscsit_unmap_iovec(cmd);
646
647 if (ret < 0) {
648 iscsit_tx_thread_wait_for_tcp(conn);
649 return ret;
650 }
651
652 return 0;
653 }
654
655 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
656 struct iscsi_datain_req *dr, const void *buf,
657 u32 buf_len)
658 {
659 if (dr)
660 return iscsit_xmit_datain_pdu(conn, cmd, buf);
661 else
662 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
663 }
664
665 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
666 {
667 return TARGET_PROT_NORMAL;
668 }
669
670 static struct iscsit_transport iscsi_target_transport = {
671 .name = "iSCSI/TCP",
672 .transport_type = ISCSI_TCP,
673 .rdma_shutdown = false,
674 .owner = NULL,
675 .iscsit_setup_np = iscsit_setup_np,
676 .iscsit_accept_np = iscsit_accept_np,
677 .iscsit_free_np = iscsit_free_np,
678 .iscsit_get_login_rx = iscsit_get_login_rx,
679 .iscsit_put_login_tx = iscsit_put_login_tx,
680 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
681 .iscsit_immediate_queue = iscsit_immediate_queue,
682 .iscsit_response_queue = iscsit_response_queue,
683 .iscsit_queue_data_in = iscsit_queue_rsp,
684 .iscsit_queue_status = iscsit_queue_rsp,
685 .iscsit_aborted_task = iscsit_aborted_task,
686 .iscsit_xmit_pdu = iscsit_xmit_pdu,
687 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
688 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
689 };
690
691 static int __init iscsi_target_init_module(void)
692 {
693 int ret = 0, size;
694
695 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
696 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
697 if (!iscsit_global)
698 return -1;
699
700 spin_lock_init(&iscsit_global->ts_bitmap_lock);
701 mutex_init(&auth_id_lock);
702 spin_lock_init(&sess_idr_lock);
703 idr_init(&tiqn_idr);
704 idr_init(&sess_idr);
705
706 ret = target_register_template(&iscsi_ops);
707 if (ret)
708 goto out;
709
710 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
711 iscsit_global->ts_bitmap = vzalloc(size);
712 if (!iscsit_global->ts_bitmap)
713 goto configfs_out;
714
715 lio_qr_cache = kmem_cache_create("lio_qr_cache",
716 sizeof(struct iscsi_queue_req),
717 __alignof__(struct iscsi_queue_req), 0, NULL);
718 if (!lio_qr_cache) {
719 pr_err("nable to kmem_cache_create() for"
720 " lio_qr_cache\n");
721 goto bitmap_out;
722 }
723
724 lio_dr_cache = kmem_cache_create("lio_dr_cache",
725 sizeof(struct iscsi_datain_req),
726 __alignof__(struct iscsi_datain_req), 0, NULL);
727 if (!lio_dr_cache) {
728 pr_err("Unable to kmem_cache_create() for"
729 " lio_dr_cache\n");
730 goto qr_out;
731 }
732
733 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
734 sizeof(struct iscsi_ooo_cmdsn),
735 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
736 if (!lio_ooo_cache) {
737 pr_err("Unable to kmem_cache_create() for"
738 " lio_ooo_cache\n");
739 goto dr_out;
740 }
741
742 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
743 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
744 0, NULL);
745 if (!lio_r2t_cache) {
746 pr_err("Unable to kmem_cache_create() for"
747 " lio_r2t_cache\n");
748 goto ooo_out;
749 }
750
751 iscsit_register_transport(&iscsi_target_transport);
752
753 if (iscsit_load_discovery_tpg() < 0)
754 goto r2t_out;
755
756 return ret;
757 r2t_out:
758 iscsit_unregister_transport(&iscsi_target_transport);
759 kmem_cache_destroy(lio_r2t_cache);
760 ooo_out:
761 kmem_cache_destroy(lio_ooo_cache);
762 dr_out:
763 kmem_cache_destroy(lio_dr_cache);
764 qr_out:
765 kmem_cache_destroy(lio_qr_cache);
766 bitmap_out:
767 vfree(iscsit_global->ts_bitmap);
768 configfs_out:
769 /* XXX: this probably wants it to be it's own unwind step.. */
770 if (iscsit_global->discovery_tpg)
771 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
772 target_unregister_template(&iscsi_ops);
773 out:
774 kfree(iscsit_global);
775 return -ENOMEM;
776 }
777
778 static void __exit iscsi_target_cleanup_module(void)
779 {
780 iscsit_release_discovery_tpg();
781 iscsit_unregister_transport(&iscsi_target_transport);
782 kmem_cache_destroy(lio_qr_cache);
783 kmem_cache_destroy(lio_dr_cache);
784 kmem_cache_destroy(lio_ooo_cache);
785 kmem_cache_destroy(lio_r2t_cache);
786
787 /*
788 * Shutdown discovery sessions and disable discovery TPG
789 */
790 if (iscsit_global->discovery_tpg)
791 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
792
793 target_unregister_template(&iscsi_ops);
794
795 vfree(iscsit_global->ts_bitmap);
796 kfree(iscsit_global);
797 }
798
799 int iscsit_add_reject(
800 struct iscsi_conn *conn,
801 u8 reason,
802 unsigned char *buf)
803 {
804 struct iscsi_cmd *cmd;
805
806 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
807 if (!cmd)
808 return -1;
809
810 cmd->iscsi_opcode = ISCSI_OP_REJECT;
811 cmd->reject_reason = reason;
812
813 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
814 if (!cmd->buf_ptr) {
815 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
816 iscsit_free_cmd(cmd, false);
817 return -1;
818 }
819
820 spin_lock_bh(&conn->cmd_lock);
821 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
822 spin_unlock_bh(&conn->cmd_lock);
823
824 cmd->i_state = ISTATE_SEND_REJECT;
825 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
826
827 return -1;
828 }
829 EXPORT_SYMBOL(iscsit_add_reject);
830
831 static int iscsit_add_reject_from_cmd(
832 struct iscsi_cmd *cmd,
833 u8 reason,
834 bool add_to_conn,
835 unsigned char *buf)
836 {
837 struct iscsi_conn *conn;
838 const bool do_put = cmd->se_cmd.se_tfo != NULL;
839
840 if (!cmd->conn) {
841 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
842 cmd->init_task_tag);
843 return -1;
844 }
845 conn = cmd->conn;
846
847 cmd->iscsi_opcode = ISCSI_OP_REJECT;
848 cmd->reject_reason = reason;
849
850 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
851 if (!cmd->buf_ptr) {
852 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
853 iscsit_free_cmd(cmd, false);
854 return -1;
855 }
856
857 if (add_to_conn) {
858 spin_lock_bh(&conn->cmd_lock);
859 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
860 spin_unlock_bh(&conn->cmd_lock);
861 }
862
863 cmd->i_state = ISTATE_SEND_REJECT;
864 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
865 /*
866 * Perform the kref_put now if se_cmd has already been setup by
867 * scsit_setup_scsi_cmd()
868 */
869 if (do_put) {
870 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
871 target_put_sess_cmd(&cmd->se_cmd);
872 }
873 return -1;
874 }
875
876 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
877 unsigned char *buf)
878 {
879 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
880 }
881
882 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
883 {
884 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
885 }
886 EXPORT_SYMBOL(iscsit_reject_cmd);
887
888 /*
889 * Map some portion of the allocated scatterlist to an iovec, suitable for
890 * kernel sockets to copy data in/out.
891 */
892 static int iscsit_map_iovec(
893 struct iscsi_cmd *cmd,
894 struct kvec *iov,
895 u32 data_offset,
896 u32 data_length)
897 {
898 u32 i = 0;
899 struct scatterlist *sg;
900 unsigned int page_off;
901
902 /*
903 * We know each entry in t_data_sg contains a page.
904 */
905 u32 ent = data_offset / PAGE_SIZE;
906
907 if (ent >= cmd->se_cmd.t_data_nents) {
908 pr_err("Initial page entry out-of-bounds\n");
909 return -1;
910 }
911
912 sg = &cmd->se_cmd.t_data_sg[ent];
913 page_off = (data_offset % PAGE_SIZE);
914
915 cmd->first_data_sg = sg;
916 cmd->first_data_sg_off = page_off;
917
918 while (data_length) {
919 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
920
921 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
922 iov[i].iov_len = cur_len;
923
924 data_length -= cur_len;
925 page_off = 0;
926 sg = sg_next(sg);
927 i++;
928 }
929
930 cmd->kmapped_nents = i;
931
932 return i;
933 }
934
935 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
936 {
937 u32 i;
938 struct scatterlist *sg;
939
940 sg = cmd->first_data_sg;
941
942 for (i = 0; i < cmd->kmapped_nents; i++)
943 kunmap(sg_page(&sg[i]));
944 }
945
946 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
947 {
948 LIST_HEAD(ack_list);
949 struct iscsi_cmd *cmd, *cmd_p;
950
951 conn->exp_statsn = exp_statsn;
952
953 if (conn->sess->sess_ops->RDMAExtensions)
954 return;
955
956 spin_lock_bh(&conn->cmd_lock);
957 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
958 spin_lock(&cmd->istate_lock);
959 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
960 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
961 cmd->i_state = ISTATE_REMOVE;
962 spin_unlock(&cmd->istate_lock);
963 list_move_tail(&cmd->i_conn_node, &ack_list);
964 continue;
965 }
966 spin_unlock(&cmd->istate_lock);
967 }
968 spin_unlock_bh(&conn->cmd_lock);
969
970 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
971 list_del_init(&cmd->i_conn_node);
972 iscsit_free_cmd(cmd, false);
973 }
974 }
975
976 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
977 {
978 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
979
980 iov_count += ISCSI_IOV_DATA_BUFFER;
981 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
982 if (!cmd->iov_data)
983 return -ENOMEM;
984
985 cmd->orig_iov_data_count = iov_count;
986 return 0;
987 }
988
989 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
990 unsigned char *buf)
991 {
992 int data_direction, payload_length;
993 struct iscsi_scsi_req *hdr;
994 int iscsi_task_attr;
995 int sam_task_attr;
996
997 atomic_long_inc(&conn->sess->cmd_pdus);
998
999 hdr = (struct iscsi_scsi_req *) buf;
1000 payload_length = ntoh24(hdr->dlength);
1001
1002 /* FIXME; Add checks for AdditionalHeaderSegment */
1003
1004 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1005 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1006 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1007 " not set. Bad iSCSI Initiator.\n");
1008 return iscsit_add_reject_cmd(cmd,
1009 ISCSI_REASON_BOOKMARK_INVALID, buf);
1010 }
1011
1012 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1013 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1014 /*
1015 * From RFC-3720 Section 10.3.1:
1016 *
1017 * "Either or both of R and W MAY be 1 when either the
1018 * Expected Data Transfer Length and/or Bidirectional Read
1019 * Expected Data Transfer Length are 0"
1020 *
1021 * For this case, go ahead and clear the unnecssary bits
1022 * to avoid any confusion with ->data_direction.
1023 */
1024 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1025 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1026
1027 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1028 " set when Expected Data Transfer Length is 0 for"
1029 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1030 }
1031
1032 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1033 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1034 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1035 " MUST be set if Expected Data Transfer Length is not 0."
1036 " Bad iSCSI Initiator\n");
1037 return iscsit_add_reject_cmd(cmd,
1038 ISCSI_REASON_BOOKMARK_INVALID, buf);
1039 }
1040
1041 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1042 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1043 pr_err("Bidirectional operations not supported!\n");
1044 return iscsit_add_reject_cmd(cmd,
1045 ISCSI_REASON_BOOKMARK_INVALID, buf);
1046 }
1047
1048 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1049 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1050 " Scsi Command PDU.\n");
1051 return iscsit_add_reject_cmd(cmd,
1052 ISCSI_REASON_BOOKMARK_INVALID, buf);
1053 }
1054
1055 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1056 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1057 " protocol error.\n", payload_length);
1058 return iscsit_add_reject_cmd(cmd,
1059 ISCSI_REASON_PROTOCOL_ERROR, buf);
1060 }
1061
1062 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1063 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1064 pr_err("Expected Data Transfer Length and Length of"
1065 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1066 " bit is not set protocol error\n");
1067 return iscsit_add_reject_cmd(cmd,
1068 ISCSI_REASON_PROTOCOL_ERROR, buf);
1069 }
1070
1071 if (payload_length > be32_to_cpu(hdr->data_length)) {
1072 pr_err("DataSegmentLength: %u is greater than"
1073 " EDTL: %u, protocol error.\n", payload_length,
1074 hdr->data_length);
1075 return iscsit_add_reject_cmd(cmd,
1076 ISCSI_REASON_PROTOCOL_ERROR, buf);
1077 }
1078
1079 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1080 pr_err("DataSegmentLength: %u is greater than"
1081 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1082 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1083 return iscsit_add_reject_cmd(cmd,
1084 ISCSI_REASON_PROTOCOL_ERROR, buf);
1085 }
1086
1087 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1088 pr_err("DataSegmentLength: %u is greater than"
1089 " FirstBurstLength: %u, protocol error.\n",
1090 payload_length, conn->sess->sess_ops->FirstBurstLength);
1091 return iscsit_add_reject_cmd(cmd,
1092 ISCSI_REASON_BOOKMARK_INVALID, buf);
1093 }
1094
1095 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1096 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1097 DMA_NONE;
1098
1099 cmd->data_direction = data_direction;
1100 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1101 /*
1102 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1103 */
1104 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1105 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1106 sam_task_attr = TCM_SIMPLE_TAG;
1107 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1108 sam_task_attr = TCM_ORDERED_TAG;
1109 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1110 sam_task_attr = TCM_HEAD_TAG;
1111 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1112 sam_task_attr = TCM_ACA_TAG;
1113 else {
1114 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1115 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1116 sam_task_attr = TCM_SIMPLE_TAG;
1117 }
1118
1119 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1120 cmd->i_state = ISTATE_NEW_CMD;
1121 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1122 cmd->immediate_data = (payload_length) ? 1 : 0;
1123 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1124 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1125 if (cmd->unsolicited_data)
1126 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1127
1128 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1129 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1130 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1131 else
1132 cmd->targ_xfer_tag = 0xFFFFFFFF;
1133 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1134 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1135 cmd->first_burst_len = payload_length;
1136
1137 if (!conn->sess->sess_ops->RDMAExtensions &&
1138 cmd->data_direction == DMA_FROM_DEVICE) {
1139 struct iscsi_datain_req *dr;
1140
1141 dr = iscsit_allocate_datain_req();
1142 if (!dr)
1143 return iscsit_add_reject_cmd(cmd,
1144 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1145
1146 iscsit_attach_datain_req(cmd, dr);
1147 }
1148
1149 /*
1150 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1151 */
1152 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1153 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1154 cmd->data_direction, sam_task_attr,
1155 cmd->sense_buffer + 2);
1156
1157 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1158 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1159 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1160 conn->cid);
1161
1162 target_get_sess_cmd(&cmd->se_cmd, true);
1163
1164 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1165 scsilun_to_int(&hdr->lun));
1166 if (cmd->sense_reason)
1167 goto attach_cmd;
1168
1169 /* only used for printks or comparing with ->ref_task_tag */
1170 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1171 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1172 if (cmd->sense_reason) {
1173 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1174 return iscsit_add_reject_cmd(cmd,
1175 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1176 }
1177
1178 goto attach_cmd;
1179 }
1180
1181 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1182 return iscsit_add_reject_cmd(cmd,
1183 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1184 }
1185
1186 attach_cmd:
1187 spin_lock_bh(&conn->cmd_lock);
1188 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1189 spin_unlock_bh(&conn->cmd_lock);
1190 /*
1191 * Check if we need to delay processing because of ALUA
1192 * Active/NonOptimized primary access state..
1193 */
1194 core_alua_check_nonop_delay(&cmd->se_cmd);
1195
1196 return 0;
1197 }
1198 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1199
1200 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1201 {
1202 iscsit_set_dataout_sequence_values(cmd);
1203
1204 spin_lock_bh(&cmd->dataout_timeout_lock);
1205 iscsit_start_dataout_timer(cmd, cmd->conn);
1206 spin_unlock_bh(&cmd->dataout_timeout_lock);
1207 }
1208 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1209
1210 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1211 struct iscsi_scsi_req *hdr)
1212 {
1213 int cmdsn_ret = 0;
1214 /*
1215 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1216 * the Immediate Bit is not set, and no Immediate
1217 * Data is attached.
1218 *
1219 * A PDU/CmdSN carrying Immediate Data can only
1220 * be processed after the DataCRC has passed.
1221 * If the DataCRC fails, the CmdSN MUST NOT
1222 * be acknowledged. (See below)
1223 */
1224 if (!cmd->immediate_data) {
1225 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1226 (unsigned char *)hdr, hdr->cmdsn);
1227 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1228 return -1;
1229 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1230 target_put_sess_cmd(&cmd->se_cmd);
1231 return 0;
1232 }
1233 }
1234
1235 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1236
1237 /*
1238 * If no Immediate Data is attached, it's OK to return now.
1239 */
1240 if (!cmd->immediate_data) {
1241 if (!cmd->sense_reason && cmd->unsolicited_data)
1242 iscsit_set_unsoliticed_dataout(cmd);
1243 if (!cmd->sense_reason)
1244 return 0;
1245
1246 target_put_sess_cmd(&cmd->se_cmd);
1247 return 0;
1248 }
1249
1250 /*
1251 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1252 * execution. These exceptions are processed in CmdSN order using
1253 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1254 */
1255 if (cmd->sense_reason)
1256 return 1;
1257 /*
1258 * Call directly into transport_generic_new_cmd() to perform
1259 * the backend memory allocation.
1260 */
1261 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1262 if (cmd->sense_reason)
1263 return 1;
1264
1265 return 0;
1266 }
1267 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1268
1269 static int
1270 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1271 bool dump_payload)
1272 {
1273 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1274 /*
1275 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1276 */
1277 if (dump_payload)
1278 goto after_immediate_data;
1279 /*
1280 * Check for underflow case where both EDTL and immediate data payload
1281 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1282 * already been set in target_cmd_size_check() as se_cmd->data_length.
1283 *
1284 * For this special case, fail the command and dump the immediate data
1285 * payload.
1286 */
1287 if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1288 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1289 goto after_immediate_data;
1290 }
1291
1292 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1293 cmd->first_burst_len);
1294 after_immediate_data:
1295 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1296 /*
1297 * A PDU/CmdSN carrying Immediate Data passed
1298 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1299 * Immediate Bit is not set.
1300 */
1301 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1302 (unsigned char *)hdr, hdr->cmdsn);
1303 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1304 return -1;
1305
1306 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1307 int rc;
1308
1309 rc = iscsit_dump_data_payload(cmd->conn,
1310 cmd->first_burst_len, 1);
1311 target_put_sess_cmd(&cmd->se_cmd);
1312 return rc;
1313 } else if (cmd->unsolicited_data)
1314 iscsit_set_unsoliticed_dataout(cmd);
1315
1316 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1317 /*
1318 * Immediate Data failed DataCRC and ERL>=1,
1319 * silently drop this PDU and let the initiator
1320 * plug the CmdSN gap.
1321 *
1322 * FIXME: Send Unsolicited NOPIN with reserved
1323 * TTT here to help the initiator figure out
1324 * the missing CmdSN, although they should be
1325 * intelligent enough to determine the missing
1326 * CmdSN and issue a retry to plug the sequence.
1327 */
1328 cmd->i_state = ISTATE_REMOVE;
1329 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1330 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1331 return -1;
1332
1333 return 0;
1334 }
1335
1336 static int
1337 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1338 unsigned char *buf)
1339 {
1340 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1341 int rc, immed_data;
1342 bool dump_payload = false;
1343
1344 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1345 if (rc < 0)
1346 return 0;
1347 /*
1348 * Allocation iovecs needed for struct socket operations for
1349 * traditional iSCSI block I/O.
1350 */
1351 if (iscsit_allocate_iovecs(cmd) < 0) {
1352 return iscsit_reject_cmd(cmd,
1353 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1354 }
1355 immed_data = cmd->immediate_data;
1356
1357 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1358 if (rc < 0)
1359 return rc;
1360 else if (rc > 0)
1361 dump_payload = true;
1362
1363 if (!immed_data)
1364 return 0;
1365
1366 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1367 }
1368
1369 static u32 iscsit_do_crypto_hash_sg(
1370 struct ahash_request *hash,
1371 struct iscsi_cmd *cmd,
1372 u32 data_offset,
1373 u32 data_length,
1374 u32 padding,
1375 u8 *pad_bytes)
1376 {
1377 u32 data_crc;
1378 struct scatterlist *sg;
1379 unsigned int page_off;
1380
1381 crypto_ahash_init(hash);
1382
1383 sg = cmd->first_data_sg;
1384 page_off = cmd->first_data_sg_off;
1385
1386 while (data_length) {
1387 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1388
1389 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1390 crypto_ahash_update(hash);
1391
1392 data_length -= cur_len;
1393 page_off = 0;
1394 /* iscsit_map_iovec has already checked for invalid sg pointers */
1395 sg = sg_next(sg);
1396 }
1397
1398 if (padding) {
1399 struct scatterlist pad_sg;
1400
1401 sg_init_one(&pad_sg, pad_bytes, padding);
1402 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1403 padding);
1404 crypto_ahash_finup(hash);
1405 } else {
1406 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1407 crypto_ahash_final(hash);
1408 }
1409
1410 return data_crc;
1411 }
1412
1413 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1414 const void *buf, u32 payload_length, u32 padding,
1415 const void *pad_bytes, void *data_crc)
1416 {
1417 struct scatterlist sg[2];
1418
1419 sg_init_table(sg, ARRAY_SIZE(sg));
1420 sg_set_buf(sg, buf, payload_length);
1421 sg_set_buf(sg + 1, pad_bytes, padding);
1422
1423 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1424
1425 crypto_ahash_digest(hash);
1426 }
1427
1428 int
1429 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1430 struct iscsi_cmd *cmd, u32 payload_length,
1431 bool *success)
1432 {
1433 struct iscsi_data *hdr = buf;
1434 struct se_cmd *se_cmd;
1435 int rc;
1436
1437 /* iSCSI write */
1438 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1439
1440 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1441 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1442 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1443 payload_length, conn->cid);
1444
1445 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1446 pr_err("Command ITT: 0x%08x received DataOUT after"
1447 " last DataOUT received, dumping payload\n",
1448 cmd->init_task_tag);
1449 return iscsit_dump_data_payload(conn, payload_length, 1);
1450 }
1451
1452 if (cmd->data_direction != DMA_TO_DEVICE) {
1453 pr_err("Command ITT: 0x%08x received DataOUT for a"
1454 " NON-WRITE command.\n", cmd->init_task_tag);
1455 return iscsit_dump_data_payload(conn, payload_length, 1);
1456 }
1457 se_cmd = &cmd->se_cmd;
1458 iscsit_mod_dataout_timer(cmd);
1459
1460 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1461 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1462 be32_to_cpu(hdr->offset), payload_length,
1463 cmd->se_cmd.data_length);
1464 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1465 }
1466
1467 if (cmd->unsolicited_data) {
1468 int dump_unsolicited_data = 0;
1469
1470 if (conn->sess->sess_ops->InitialR2T) {
1471 pr_err("Received unexpected unsolicited data"
1472 " while InitialR2T=Yes, protocol error.\n");
1473 transport_send_check_condition_and_sense(&cmd->se_cmd,
1474 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1475 return -1;
1476 }
1477 /*
1478 * Special case for dealing with Unsolicited DataOUT
1479 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1480 * failures;
1481 */
1482
1483 /* Something's amiss if we're not in WRITE_PENDING state... */
1484 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1485 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1486 dump_unsolicited_data = 1;
1487
1488 if (dump_unsolicited_data) {
1489 /*
1490 * Check if a delayed TASK_ABORTED status needs to
1491 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1492 * received with the unsolicited data out.
1493 */
1494 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1495 iscsit_stop_dataout_timer(cmd);
1496
1497 transport_check_aborted_status(se_cmd,
1498 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1499 return iscsit_dump_data_payload(conn, payload_length, 1);
1500 }
1501 } else {
1502 /*
1503 * For the normal solicited data path:
1504 *
1505 * Check for a delayed TASK_ABORTED status and dump any
1506 * incoming data out payload if one exists. Also, when the
1507 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1508 * data out sequence, we decrement outstanding_r2ts. Once
1509 * outstanding_r2ts reaches zero, go ahead and send the delayed
1510 * TASK_ABORTED status.
1511 */
1512 if (se_cmd->transport_state & CMD_T_ABORTED) {
1513 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1514 if (--cmd->outstanding_r2ts < 1) {
1515 iscsit_stop_dataout_timer(cmd);
1516 transport_check_aborted_status(
1517 se_cmd, 1);
1518 }
1519
1520 return iscsit_dump_data_payload(conn, payload_length, 1);
1521 }
1522 }
1523 /*
1524 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1525 * within-command recovery checks before receiving the payload.
1526 */
1527 rc = iscsit_check_pre_dataout(cmd, buf);
1528 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1529 return 0;
1530 else if (rc == DATAOUT_CANNOT_RECOVER)
1531 return -1;
1532 *success = true;
1533 return 0;
1534 }
1535 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1536
1537 int
1538 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1539 struct iscsi_cmd **out_cmd)
1540 {
1541 struct iscsi_data *hdr = buf;
1542 struct iscsi_cmd *cmd;
1543 u32 payload_length = ntoh24(hdr->dlength);
1544 int rc;
1545 bool success = false;
1546
1547 if (!payload_length) {
1548 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1549 return 0;
1550 }
1551
1552 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1553 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1554 " MaxXmitDataSegmentLength: %u\n", payload_length,
1555 conn->conn_ops->MaxXmitDataSegmentLength);
1556 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1557 }
1558
1559 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1560 if (!cmd)
1561 return 0;
1562
1563 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1564
1565 if (success)
1566 *out_cmd = cmd;
1567
1568 return rc;
1569 }
1570 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1571
1572 static int
1573 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1574 struct iscsi_data *hdr)
1575 {
1576 struct kvec *iov;
1577 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1578 u32 payload_length = ntoh24(hdr->dlength);
1579 int iov_ret, data_crc_failed = 0;
1580
1581 rx_size += payload_length;
1582 iov = &cmd->iov_data[0];
1583
1584 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1585 payload_length);
1586 if (iov_ret < 0)
1587 return -1;
1588
1589 iov_count += iov_ret;
1590
1591 padding = ((-payload_length) & 3);
1592 if (padding != 0) {
1593 iov[iov_count].iov_base = cmd->pad_bytes;
1594 iov[iov_count++].iov_len = padding;
1595 rx_size += padding;
1596 pr_debug("Receiving %u padding bytes.\n", padding);
1597 }
1598
1599 if (conn->conn_ops->DataDigest) {
1600 iov[iov_count].iov_base = &checksum;
1601 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1602 rx_size += ISCSI_CRC_LEN;
1603 }
1604
1605 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1606
1607 iscsit_unmap_iovec(cmd);
1608
1609 if (rx_got != rx_size)
1610 return -1;
1611
1612 if (conn->conn_ops->DataDigest) {
1613 u32 data_crc;
1614
1615 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1616 be32_to_cpu(hdr->offset),
1617 payload_length, padding,
1618 cmd->pad_bytes);
1619
1620 if (checksum != data_crc) {
1621 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1622 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1623 " does not match computed 0x%08x\n",
1624 hdr->itt, hdr->offset, payload_length,
1625 hdr->datasn, checksum, data_crc);
1626 data_crc_failed = 1;
1627 } else {
1628 pr_debug("Got CRC32C DataDigest 0x%08x for"
1629 " %u bytes of Data Out\n", checksum,
1630 payload_length);
1631 }
1632 }
1633
1634 return data_crc_failed;
1635 }
1636
1637 int
1638 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1639 bool data_crc_failed)
1640 {
1641 struct iscsi_conn *conn = cmd->conn;
1642 int rc, ooo_cmdsn;
1643 /*
1644 * Increment post receive data and CRC values or perform
1645 * within-command recovery.
1646 */
1647 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1648 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1649 return 0;
1650 else if (rc == DATAOUT_SEND_R2T) {
1651 iscsit_set_dataout_sequence_values(cmd);
1652 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1653 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1654 /*
1655 * Handle extra special case for out of order
1656 * Unsolicited Data Out.
1657 */
1658 spin_lock_bh(&cmd->istate_lock);
1659 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1660 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1661 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1662 spin_unlock_bh(&cmd->istate_lock);
1663
1664 iscsit_stop_dataout_timer(cmd);
1665 if (ooo_cmdsn)
1666 return 0;
1667 target_execute_cmd(&cmd->se_cmd);
1668 return 0;
1669 } else /* DATAOUT_CANNOT_RECOVER */
1670 return -1;
1671
1672 return 0;
1673 }
1674 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1675
1676 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1677 {
1678 struct iscsi_cmd *cmd = NULL;
1679 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1680 int rc;
1681 bool data_crc_failed = false;
1682
1683 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1684 if (rc < 0)
1685 return 0;
1686 else if (!cmd)
1687 return 0;
1688
1689 rc = iscsit_get_dataout(conn, cmd, hdr);
1690 if (rc < 0)
1691 return rc;
1692 else if (rc > 0)
1693 data_crc_failed = true;
1694
1695 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1696 }
1697
1698 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1699 struct iscsi_nopout *hdr)
1700 {
1701 u32 payload_length = ntoh24(hdr->dlength);
1702
1703 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1704 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1705 if (!cmd)
1706 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1707 (unsigned char *)hdr);
1708
1709 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1710 (unsigned char *)hdr);
1711 }
1712
1713 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1714 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1715 " not set, protocol error.\n");
1716 if (!cmd)
1717 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1718 (unsigned char *)hdr);
1719
1720 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1721 (unsigned char *)hdr);
1722 }
1723
1724 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1725 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1726 " greater than MaxXmitDataSegmentLength: %u, protocol"
1727 " error.\n", payload_length,
1728 conn->conn_ops->MaxXmitDataSegmentLength);
1729 if (!cmd)
1730 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1731 (unsigned char *)hdr);
1732
1733 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1734 (unsigned char *)hdr);
1735 }
1736
1737 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1738 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1739 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1740 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1741 payload_length);
1742 /*
1743 * This is not a response to a Unsolicited NopIN, which means
1744 * it can either be a NOPOUT ping request (with a valid ITT),
1745 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1746 * Either way, make sure we allocate an struct iscsi_cmd, as both
1747 * can contain ping data.
1748 */
1749 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1750 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1751 cmd->i_state = ISTATE_SEND_NOPIN;
1752 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1753 1 : 0);
1754 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1755 cmd->targ_xfer_tag = 0xFFFFFFFF;
1756 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1757 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1758 cmd->data_direction = DMA_NONE;
1759 }
1760
1761 return 0;
1762 }
1763 EXPORT_SYMBOL(iscsit_setup_nop_out);
1764
1765 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1766 struct iscsi_nopout *hdr)
1767 {
1768 struct iscsi_cmd *cmd_p = NULL;
1769 int cmdsn_ret = 0;
1770 /*
1771 * Initiator is expecting a NopIN ping reply..
1772 */
1773 if (hdr->itt != RESERVED_ITT) {
1774 if (!cmd)
1775 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1776 (unsigned char *)hdr);
1777
1778 spin_lock_bh(&conn->cmd_lock);
1779 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1780 spin_unlock_bh(&conn->cmd_lock);
1781
1782 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1783
1784 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1785 iscsit_add_cmd_to_response_queue(cmd, conn,
1786 cmd->i_state);
1787 return 0;
1788 }
1789
1790 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1791 (unsigned char *)hdr, hdr->cmdsn);
1792 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1793 return 0;
1794 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1795 return -1;
1796
1797 return 0;
1798 }
1799 /*
1800 * This was a response to a unsolicited NOPIN ping.
1801 */
1802 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1803 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1804 if (!cmd_p)
1805 return -EINVAL;
1806
1807 iscsit_stop_nopin_response_timer(conn);
1808
1809 cmd_p->i_state = ISTATE_REMOVE;
1810 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1811
1812 iscsit_start_nopin_timer(conn);
1813 return 0;
1814 }
1815 /*
1816 * Otherwise, initiator is not expecting a NOPIN is response.
1817 * Just ignore for now.
1818 */
1819
1820 if (cmd)
1821 iscsit_free_cmd(cmd, false);
1822
1823 return 0;
1824 }
1825 EXPORT_SYMBOL(iscsit_process_nop_out);
1826
1827 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1828 unsigned char *buf)
1829 {
1830 unsigned char *ping_data = NULL;
1831 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1832 struct kvec *iov = NULL;
1833 u32 payload_length = ntoh24(hdr->dlength);
1834 int ret;
1835
1836 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1837 if (ret < 0)
1838 return 0;
1839 /*
1840 * Handle NOP-OUT payload for traditional iSCSI sockets
1841 */
1842 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1843 u32 checksum, data_crc, padding = 0;
1844 int niov = 0, rx_got, rx_size = payload_length;
1845
1846 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1847 if (!ping_data) {
1848 ret = -1;
1849 goto out;
1850 }
1851
1852 iov = &cmd->iov_misc[0];
1853 iov[niov].iov_base = ping_data;
1854 iov[niov++].iov_len = payload_length;
1855
1856 padding = ((-payload_length) & 3);
1857 if (padding != 0) {
1858 pr_debug("Receiving %u additional bytes"
1859 " for padding.\n", padding);
1860 iov[niov].iov_base = &cmd->pad_bytes;
1861 iov[niov++].iov_len = padding;
1862 rx_size += padding;
1863 }
1864 if (conn->conn_ops->DataDigest) {
1865 iov[niov].iov_base = &checksum;
1866 iov[niov++].iov_len = ISCSI_CRC_LEN;
1867 rx_size += ISCSI_CRC_LEN;
1868 }
1869
1870 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1871 if (rx_got != rx_size) {
1872 ret = -1;
1873 goto out;
1874 }
1875
1876 if (conn->conn_ops->DataDigest) {
1877 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1878 payload_length, padding,
1879 cmd->pad_bytes, &data_crc);
1880
1881 if (checksum != data_crc) {
1882 pr_err("Ping data CRC32C DataDigest"
1883 " 0x%08x does not match computed 0x%08x\n",
1884 checksum, data_crc);
1885 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1886 pr_err("Unable to recover from"
1887 " NOPOUT Ping DataCRC failure while in"
1888 " ERL=0.\n");
1889 ret = -1;
1890 goto out;
1891 } else {
1892 /*
1893 * Silently drop this PDU and let the
1894 * initiator plug the CmdSN gap.
1895 */
1896 pr_debug("Dropping NOPOUT"
1897 " Command CmdSN: 0x%08x due to"
1898 " DataCRC error.\n", hdr->cmdsn);
1899 ret = 0;
1900 goto out;
1901 }
1902 } else {
1903 pr_debug("Got CRC32C DataDigest"
1904 " 0x%08x for %u bytes of ping data.\n",
1905 checksum, payload_length);
1906 }
1907 }
1908
1909 ping_data[payload_length] = '\0';
1910 /*
1911 * Attach ping data to struct iscsi_cmd->buf_ptr.
1912 */
1913 cmd->buf_ptr = ping_data;
1914 cmd->buf_ptr_size = payload_length;
1915
1916 pr_debug("Got %u bytes of NOPOUT ping"
1917 " data.\n", payload_length);
1918 pr_debug("Ping Data: \"%s\"\n", ping_data);
1919 }
1920
1921 return iscsit_process_nop_out(conn, cmd, hdr);
1922 out:
1923 if (cmd)
1924 iscsit_free_cmd(cmd, false);
1925
1926 kfree(ping_data);
1927 return ret;
1928 }
1929
1930 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1931 {
1932 switch (iscsi_tmf) {
1933 case ISCSI_TM_FUNC_ABORT_TASK:
1934 return TMR_ABORT_TASK;
1935 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1936 return TMR_ABORT_TASK_SET;
1937 case ISCSI_TM_FUNC_CLEAR_ACA:
1938 return TMR_CLEAR_ACA;
1939 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1940 return TMR_CLEAR_TASK_SET;
1941 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1942 return TMR_LUN_RESET;
1943 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1944 return TMR_TARGET_WARM_RESET;
1945 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1946 return TMR_TARGET_COLD_RESET;
1947 default:
1948 return TMR_UNKNOWN;
1949 }
1950 }
1951
1952 int
1953 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1954 unsigned char *buf)
1955 {
1956 struct se_tmr_req *se_tmr;
1957 struct iscsi_tmr_req *tmr_req;
1958 struct iscsi_tm *hdr;
1959 int out_of_order_cmdsn = 0, ret;
1960 u8 function, tcm_function = TMR_UNKNOWN;
1961
1962 hdr = (struct iscsi_tm *) buf;
1963 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1964 function = hdr->flags;
1965
1966 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1967 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1968 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1969 hdr->rtt, hdr->refcmdsn, conn->cid);
1970
1971 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1972 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1973 hdr->rtt != RESERVED_ITT)) {
1974 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1975 hdr->rtt = RESERVED_ITT;
1976 }
1977
1978 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1979 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1980 pr_err("Task Management Request TASK_REASSIGN not"
1981 " issued as immediate command, bad iSCSI Initiator"
1982 "implementation\n");
1983 return iscsit_add_reject_cmd(cmd,
1984 ISCSI_REASON_PROTOCOL_ERROR, buf);
1985 }
1986 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1987 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1988 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1989
1990 cmd->data_direction = DMA_NONE;
1991 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1992 if (!cmd->tmr_req) {
1993 return iscsit_add_reject_cmd(cmd,
1994 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1995 buf);
1996 }
1997
1998 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1999 conn->sess->se_sess, 0, DMA_NONE,
2000 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2001
2002 target_get_sess_cmd(&cmd->se_cmd, true);
2003
2004 /*
2005 * TASK_REASSIGN for ERL=2 / connection stays inside of
2006 * LIO-Target $FABRIC_MOD
2007 */
2008 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2009 tcm_function = iscsit_convert_tmf(function);
2010 if (tcm_function == TMR_UNKNOWN) {
2011 pr_err("Unknown iSCSI TMR Function:"
2012 " 0x%02x\n", function);
2013 return iscsit_add_reject_cmd(cmd,
2014 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2015 }
2016 }
2017 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2018 GFP_KERNEL);
2019 if (ret < 0)
2020 return iscsit_add_reject_cmd(cmd,
2021 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2022
2023 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2024
2025 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2026 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2027 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2028 cmd->init_task_tag = hdr->itt;
2029 cmd->targ_xfer_tag = 0xFFFFFFFF;
2030 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2031 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2032 se_tmr = cmd->se_cmd.se_tmr_req;
2033 tmr_req = cmd->tmr_req;
2034 /*
2035 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2036 */
2037 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2038 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2039 scsilun_to_int(&hdr->lun));
2040 if (ret < 0) {
2041 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2042 goto attach;
2043 }
2044 }
2045
2046 switch (function) {
2047 case ISCSI_TM_FUNC_ABORT_TASK:
2048 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2049 if (se_tmr->response)
2050 goto attach;
2051 break;
2052 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2053 case ISCSI_TM_FUNC_CLEAR_ACA:
2054 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2055 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2056 break;
2057 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2058 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2059 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2060 goto attach;
2061 }
2062 break;
2063 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2064 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2065 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2066 goto attach;
2067 }
2068 break;
2069 case ISCSI_TM_FUNC_TASK_REASSIGN:
2070 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2071 /*
2072 * Perform sanity checks on the ExpDataSN only if the
2073 * TASK_REASSIGN was successful.
2074 */
2075 if (se_tmr->response)
2076 break;
2077
2078 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2079 return iscsit_add_reject_cmd(cmd,
2080 ISCSI_REASON_BOOKMARK_INVALID, buf);
2081 break;
2082 default:
2083 pr_err("Unknown TMR function: 0x%02x, protocol"
2084 " error.\n", function);
2085 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2086 goto attach;
2087 }
2088
2089 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2090 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2091 se_tmr->call_transport = 1;
2092 attach:
2093 spin_lock_bh(&conn->cmd_lock);
2094 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2095 spin_unlock_bh(&conn->cmd_lock);
2096
2097 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2098 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2099 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2100 out_of_order_cmdsn = 1;
2101 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2102 target_put_sess_cmd(&cmd->se_cmd);
2103 return 0;
2104 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2105 return -1;
2106 }
2107 }
2108 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2109
2110 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2111 return 0;
2112 /*
2113 * Found the referenced task, send to transport for processing.
2114 */
2115 if (se_tmr->call_transport)
2116 return transport_generic_handle_tmr(&cmd->se_cmd);
2117
2118 /*
2119 * Could not find the referenced LUN, task, or Task Management
2120 * command not authorized or supported. Change state and
2121 * let the tx_thread send the response.
2122 *
2123 * For connection recovery, this is also the default action for
2124 * TMR TASK_REASSIGN.
2125 */
2126 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2127 target_put_sess_cmd(&cmd->se_cmd);
2128 return 0;
2129 }
2130 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2131
2132 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2133 int
2134 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2135 struct iscsi_text *hdr)
2136 {
2137 u32 payload_length = ntoh24(hdr->dlength);
2138
2139 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2140 pr_err("Unable to accept text parameter length: %u"
2141 "greater than MaxXmitDataSegmentLength %u.\n",
2142 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2143 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2144 (unsigned char *)hdr);
2145 }
2146
2147 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2148 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2149 pr_err("Multi sequence text commands currently not supported\n");
2150 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2151 (unsigned char *)hdr);
2152 }
2153
2154 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2155 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2156 hdr->exp_statsn, payload_length);
2157
2158 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2159 cmd->i_state = ISTATE_SEND_TEXTRSP;
2160 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2161 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2162 cmd->targ_xfer_tag = 0xFFFFFFFF;
2163 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2164 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2165 cmd->data_direction = DMA_NONE;
2166 kfree(cmd->text_in_ptr);
2167 cmd->text_in_ptr = NULL;
2168
2169 return 0;
2170 }
2171 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2172
2173 int
2174 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2175 struct iscsi_text *hdr)
2176 {
2177 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2178 int cmdsn_ret;
2179
2180 if (!text_in) {
2181 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2182 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2183 pr_err("Unable to locate text_in buffer for sendtargets"
2184 " discovery\n");
2185 goto reject;
2186 }
2187 goto empty_sendtargets;
2188 }
2189 if (strncmp("SendTargets", text_in, 11) != 0) {
2190 pr_err("Received Text Data that is not"
2191 " SendTargets, cannot continue.\n");
2192 goto reject;
2193 }
2194 text_ptr = strchr(text_in, '=');
2195 if (!text_ptr) {
2196 pr_err("No \"=\" separator found in Text Data,"
2197 " cannot continue.\n");
2198 goto reject;
2199 }
2200 if (!strncmp("=All", text_ptr, 4)) {
2201 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2202 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2203 !strncmp("=eui.", text_ptr, 5)) {
2204 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2205 } else {
2206 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2207 goto reject;
2208 }
2209
2210 spin_lock_bh(&conn->cmd_lock);
2211 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2212 spin_unlock_bh(&conn->cmd_lock);
2213
2214 empty_sendtargets:
2215 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2216
2217 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2218 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2219 (unsigned char *)hdr, hdr->cmdsn);
2220 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2221 return -1;
2222
2223 return 0;
2224 }
2225
2226 return iscsit_execute_cmd(cmd, 0);
2227
2228 reject:
2229 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2230 (unsigned char *)hdr);
2231 }
2232 EXPORT_SYMBOL(iscsit_process_text_cmd);
2233
2234 static int
2235 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2236 unsigned char *buf)
2237 {
2238 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2239 char *text_in = NULL;
2240 u32 payload_length = ntoh24(hdr->dlength);
2241 int rx_size, rc;
2242
2243 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2244 if (rc < 0)
2245 return 0;
2246
2247 rx_size = payload_length;
2248 if (payload_length) {
2249 u32 checksum = 0, data_crc = 0;
2250 u32 padding = 0, pad_bytes = 0;
2251 int niov = 0, rx_got;
2252 struct kvec iov[3];
2253
2254 text_in = kzalloc(payload_length, GFP_KERNEL);
2255 if (!text_in)
2256 goto reject;
2257
2258 cmd->text_in_ptr = text_in;
2259
2260 memset(iov, 0, 3 * sizeof(struct kvec));
2261 iov[niov].iov_base = text_in;
2262 iov[niov++].iov_len = payload_length;
2263
2264 padding = ((-payload_length) & 3);
2265 if (padding != 0) {
2266 iov[niov].iov_base = &pad_bytes;
2267 iov[niov++].iov_len = padding;
2268 rx_size += padding;
2269 pr_debug("Receiving %u additional bytes"
2270 " for padding.\n", padding);
2271 }
2272 if (conn->conn_ops->DataDigest) {
2273 iov[niov].iov_base = &checksum;
2274 iov[niov++].iov_len = ISCSI_CRC_LEN;
2275 rx_size += ISCSI_CRC_LEN;
2276 }
2277
2278 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2279 if (rx_got != rx_size)
2280 goto reject;
2281
2282 if (conn->conn_ops->DataDigest) {
2283 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, text_in,
2284 payload_length, padding,
2285 &pad_bytes, &data_crc);
2286
2287 if (checksum != data_crc) {
2288 pr_err("Text data CRC32C DataDigest"
2289 " 0x%08x does not match computed"
2290 " 0x%08x\n", checksum, data_crc);
2291 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2292 pr_err("Unable to recover from"
2293 " Text Data digest failure while in"
2294 " ERL=0.\n");
2295 goto reject;
2296 } else {
2297 /*
2298 * Silently drop this PDU and let the
2299 * initiator plug the CmdSN gap.
2300 */
2301 pr_debug("Dropping Text"
2302 " Command CmdSN: 0x%08x due to"
2303 " DataCRC error.\n", hdr->cmdsn);
2304 kfree(text_in);
2305 return 0;
2306 }
2307 } else {
2308 pr_debug("Got CRC32C DataDigest"
2309 " 0x%08x for %u bytes of text data.\n",
2310 checksum, payload_length);
2311 }
2312 }
2313 text_in[payload_length - 1] = '\0';
2314 pr_debug("Successfully read %d bytes of text"
2315 " data.\n", payload_length);
2316 }
2317
2318 return iscsit_process_text_cmd(conn, cmd, hdr);
2319
2320 reject:
2321 kfree(cmd->text_in_ptr);
2322 cmd->text_in_ptr = NULL;
2323 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2324 }
2325
2326 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2327 {
2328 struct iscsi_conn *conn_p;
2329 struct iscsi_session *sess = conn->sess;
2330
2331 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2332 " for SID: %u.\n", conn->cid, conn->sess->sid);
2333
2334 atomic_set(&sess->session_logout, 1);
2335 atomic_set(&conn->conn_logout_remove, 1);
2336 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2337
2338 iscsit_inc_conn_usage_count(conn);
2339 iscsit_inc_session_usage_count(sess);
2340
2341 spin_lock_bh(&sess->conn_lock);
2342 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2343 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2344 continue;
2345
2346 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2347 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2348 }
2349 spin_unlock_bh(&sess->conn_lock);
2350
2351 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2352
2353 return 0;
2354 }
2355
2356 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2357 {
2358 struct iscsi_conn *l_conn;
2359 struct iscsi_session *sess = conn->sess;
2360
2361 pr_debug("Received logout request CLOSECONNECTION for CID:"
2362 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2363
2364 /*
2365 * A Logout Request with a CLOSECONNECTION reason code for a CID
2366 * can arrive on a connection with a differing CID.
2367 */
2368 if (conn->cid == cmd->logout_cid) {
2369 spin_lock_bh(&conn->state_lock);
2370 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2371 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2372
2373 atomic_set(&conn->conn_logout_remove, 1);
2374 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2375 iscsit_inc_conn_usage_count(conn);
2376
2377 spin_unlock_bh(&conn->state_lock);
2378 } else {
2379 /*
2380 * Handle all different cid CLOSECONNECTION requests in
2381 * iscsit_logout_post_handler_diffcid() as to give enough
2382 * time for any non immediate command's CmdSN to be
2383 * acknowledged on the connection in question.
2384 *
2385 * Here we simply make sure the CID is still around.
2386 */
2387 l_conn = iscsit_get_conn_from_cid(sess,
2388 cmd->logout_cid);
2389 if (!l_conn) {
2390 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2391 iscsit_add_cmd_to_response_queue(cmd, conn,
2392 cmd->i_state);
2393 return 0;
2394 }
2395
2396 iscsit_dec_conn_usage_count(l_conn);
2397 }
2398
2399 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2400
2401 return 0;
2402 }
2403
2404 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2405 {
2406 struct iscsi_session *sess = conn->sess;
2407
2408 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2409 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2410
2411 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2412 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2413 " while ERL!=2.\n");
2414 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2415 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2416 return 0;
2417 }
2418
2419 if (conn->cid == cmd->logout_cid) {
2420 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2421 " with CID: %hu on CID: %hu, implementation error.\n",
2422 cmd->logout_cid, conn->cid);
2423 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2424 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2425 return 0;
2426 }
2427
2428 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2429
2430 return 0;
2431 }
2432
2433 int
2434 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2435 unsigned char *buf)
2436 {
2437 int cmdsn_ret, logout_remove = 0;
2438 u8 reason_code = 0;
2439 struct iscsi_logout *hdr;
2440 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2441
2442 hdr = (struct iscsi_logout *) buf;
2443 reason_code = (hdr->flags & 0x7f);
2444
2445 if (tiqn) {
2446 spin_lock(&tiqn->logout_stats.lock);
2447 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2448 tiqn->logout_stats.normal_logouts++;
2449 else
2450 tiqn->logout_stats.abnormal_logouts++;
2451 spin_unlock(&tiqn->logout_stats.lock);
2452 }
2453
2454 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2455 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2456 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2457 hdr->cid, conn->cid);
2458
2459 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2460 pr_err("Received logout request on connection that"
2461 " is not in logged in state, ignoring request.\n");
2462 iscsit_free_cmd(cmd, false);
2463 return 0;
2464 }
2465
2466 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2467 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2468 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2469 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2470 cmd->targ_xfer_tag = 0xFFFFFFFF;
2471 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2472 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2473 cmd->logout_cid = be16_to_cpu(hdr->cid);
2474 cmd->logout_reason = reason_code;
2475 cmd->data_direction = DMA_NONE;
2476
2477 /*
2478 * We need to sleep in these cases (by returning 1) until the Logout
2479 * Response gets sent in the tx thread.
2480 */
2481 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2482 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2483 be16_to_cpu(hdr->cid) == conn->cid))
2484 logout_remove = 1;
2485
2486 spin_lock_bh(&conn->cmd_lock);
2487 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2488 spin_unlock_bh(&conn->cmd_lock);
2489
2490 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2491 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2492
2493 /*
2494 * Immediate commands are executed, well, immediately.
2495 * Non-Immediate Logout Commands are executed in CmdSN order.
2496 */
2497 if (cmd->immediate_cmd) {
2498 int ret = iscsit_execute_cmd(cmd, 0);
2499
2500 if (ret < 0)
2501 return ret;
2502 } else {
2503 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2504 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2505 logout_remove = 0;
2506 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2507 return -1;
2508 }
2509
2510 return logout_remove;
2511 }
2512 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2513
2514 int iscsit_handle_snack(
2515 struct iscsi_conn *conn,
2516 unsigned char *buf)
2517 {
2518 struct iscsi_snack *hdr;
2519
2520 hdr = (struct iscsi_snack *) buf;
2521 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2522
2523 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2524 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2525 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2526 hdr->begrun, hdr->runlength, conn->cid);
2527
2528 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2529 pr_err("Initiator sent SNACK request while in"
2530 " ErrorRecoveryLevel=0.\n");
2531 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2532 buf);
2533 }
2534 /*
2535 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2536 * call from inside iscsi_send_recovery_datain_or_r2t().
2537 */
2538 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2539 case 0:
2540 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2541 hdr->itt,
2542 be32_to_cpu(hdr->ttt),
2543 be32_to_cpu(hdr->begrun),
2544 be32_to_cpu(hdr->runlength));
2545 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2546 return iscsit_handle_status_snack(conn, hdr->itt,
2547 be32_to_cpu(hdr->ttt),
2548 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2549 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2550 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2551 be32_to_cpu(hdr->begrun),
2552 be32_to_cpu(hdr->runlength));
2553 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2554 /* FIXME: Support R-Data SNACK */
2555 pr_err("R-Data SNACK Not Supported.\n");
2556 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2557 buf);
2558 default:
2559 pr_err("Unknown SNACK type 0x%02x, protocol"
2560 " error.\n", hdr->flags & 0x0f);
2561 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2562 buf);
2563 }
2564
2565 return 0;
2566 }
2567 EXPORT_SYMBOL(iscsit_handle_snack);
2568
2569 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2570 {
2571 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2572 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2573 wait_for_completion_interruptible_timeout(
2574 &conn->rx_half_close_comp,
2575 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2576 }
2577 }
2578
2579 static int iscsit_handle_immediate_data(
2580 struct iscsi_cmd *cmd,
2581 struct iscsi_scsi_req *hdr,
2582 u32 length)
2583 {
2584 int iov_ret, rx_got = 0, rx_size = 0;
2585 u32 checksum, iov_count = 0, padding = 0;
2586 struct iscsi_conn *conn = cmd->conn;
2587 struct kvec *iov;
2588
2589 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2590 if (iov_ret < 0)
2591 return IMMEDIATE_DATA_CANNOT_RECOVER;
2592
2593 rx_size = length;
2594 iov_count = iov_ret;
2595 iov = &cmd->iov_data[0];
2596
2597 padding = ((-length) & 3);
2598 if (padding != 0) {
2599 iov[iov_count].iov_base = cmd->pad_bytes;
2600 iov[iov_count++].iov_len = padding;
2601 rx_size += padding;
2602 }
2603
2604 if (conn->conn_ops->DataDigest) {
2605 iov[iov_count].iov_base = &checksum;
2606 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2607 rx_size += ISCSI_CRC_LEN;
2608 }
2609
2610 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2611
2612 iscsit_unmap_iovec(cmd);
2613
2614 if (rx_got != rx_size) {
2615 iscsit_rx_thread_wait_for_tcp(conn);
2616 return IMMEDIATE_DATA_CANNOT_RECOVER;
2617 }
2618
2619 if (conn->conn_ops->DataDigest) {
2620 u32 data_crc;
2621
2622 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2623 cmd->write_data_done, length, padding,
2624 cmd->pad_bytes);
2625
2626 if (checksum != data_crc) {
2627 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2628 " does not match computed 0x%08x\n", checksum,
2629 data_crc);
2630
2631 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2632 pr_err("Unable to recover from"
2633 " Immediate Data digest failure while"
2634 " in ERL=0.\n");
2635 iscsit_reject_cmd(cmd,
2636 ISCSI_REASON_DATA_DIGEST_ERROR,
2637 (unsigned char *)hdr);
2638 return IMMEDIATE_DATA_CANNOT_RECOVER;
2639 } else {
2640 iscsit_reject_cmd(cmd,
2641 ISCSI_REASON_DATA_DIGEST_ERROR,
2642 (unsigned char *)hdr);
2643 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2644 }
2645 } else {
2646 pr_debug("Got CRC32C DataDigest 0x%08x for"
2647 " %u bytes of Immediate Data\n", checksum,
2648 length);
2649 }
2650 }
2651
2652 cmd->write_data_done += length;
2653
2654 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2655 spin_lock_bh(&cmd->istate_lock);
2656 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2657 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2658 spin_unlock_bh(&cmd->istate_lock);
2659 }
2660
2661 return IMMEDIATE_DATA_NORMAL_OPERATION;
2662 }
2663
2664 /*
2665 * Called with sess->conn_lock held.
2666 */
2667 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2668 with active network interface */
2669 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2670 {
2671 struct iscsi_cmd *cmd;
2672 struct iscsi_conn *conn_p;
2673 bool found = false;
2674
2675 /*
2676 * Only send a Asynchronous Message on connections whos network
2677 * interface is still functional.
2678 */
2679 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2680 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2681 iscsit_inc_conn_usage_count(conn_p);
2682 found = true;
2683 break;
2684 }
2685 }
2686
2687 if (!found)
2688 return;
2689
2690 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2691 if (!cmd) {
2692 iscsit_dec_conn_usage_count(conn_p);
2693 return;
2694 }
2695
2696 cmd->logout_cid = conn->cid;
2697 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2698 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2699
2700 spin_lock_bh(&conn_p->cmd_lock);
2701 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2702 spin_unlock_bh(&conn_p->cmd_lock);
2703
2704 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2705 iscsit_dec_conn_usage_count(conn_p);
2706 }
2707
2708 static int iscsit_send_conn_drop_async_message(
2709 struct iscsi_cmd *cmd,
2710 struct iscsi_conn *conn)
2711 {
2712 struct iscsi_async *hdr;
2713
2714 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2715
2716 hdr = (struct iscsi_async *) cmd->pdu;
2717 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2718 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2719 cmd->init_task_tag = RESERVED_ITT;
2720 cmd->targ_xfer_tag = 0xFFFFFFFF;
2721 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2722 cmd->stat_sn = conn->stat_sn++;
2723 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2724 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2725 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2726 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2727 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2728 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2729 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2730
2731 pr_debug("Sending Connection Dropped Async Message StatSN:"
2732 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2733 cmd->logout_cid, conn->cid);
2734
2735 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2736 }
2737
2738 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2739 {
2740 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2741 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2742 wait_for_completion_interruptible_timeout(
2743 &conn->tx_half_close_comp,
2744 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2745 }
2746 }
2747
2748 void
2749 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2750 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2751 bool set_statsn)
2752 {
2753 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2754 hdr->flags = datain->flags;
2755 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2756 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2757 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2758 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2759 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2760 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2761 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2762 }
2763 }
2764 hton24(hdr->dlength, datain->length);
2765 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2766 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2767 (struct scsi_lun *)&hdr->lun);
2768 else
2769 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2770
2771 hdr->itt = cmd->init_task_tag;
2772
2773 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2774 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2775 else
2776 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2777 if (set_statsn)
2778 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2779 else
2780 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2781
2782 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2783 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2784 hdr->datasn = cpu_to_be32(datain->data_sn);
2785 hdr->offset = cpu_to_be32(datain->offset);
2786
2787 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2788 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2789 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2790 ntohl(hdr->offset), datain->length, conn->cid);
2791 }
2792 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2793
2794 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2795 {
2796 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2797 struct iscsi_datain datain;
2798 struct iscsi_datain_req *dr;
2799 int eodr = 0, ret;
2800 bool set_statsn = false;
2801
2802 memset(&datain, 0, sizeof(struct iscsi_datain));
2803 dr = iscsit_get_datain_values(cmd, &datain);
2804 if (!dr) {
2805 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2806 cmd->init_task_tag);
2807 return -1;
2808 }
2809 /*
2810 * Be paranoid and double check the logic for now.
2811 */
2812 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2813 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2814 " datain.length: %u exceeds cmd->data_length: %u\n",
2815 cmd->init_task_tag, datain.offset, datain.length,
2816 cmd->se_cmd.data_length);
2817 return -1;
2818 }
2819
2820 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2821 /*
2822 * Special case for successfully execution w/ both DATAIN
2823 * and Sense Data.
2824 */
2825 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2826 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2827 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2828 else {
2829 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2830 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2831 iscsit_increment_maxcmdsn(cmd, conn->sess);
2832 cmd->stat_sn = conn->stat_sn++;
2833 set_statsn = true;
2834 } else if (dr->dr_complete ==
2835 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2836 set_statsn = true;
2837 }
2838
2839 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2840
2841 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2842 if (ret < 0)
2843 return ret;
2844
2845 if (dr->dr_complete) {
2846 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2847 2 : 1;
2848 iscsit_free_datain_req(cmd, dr);
2849 }
2850
2851 return eodr;
2852 }
2853
2854 int
2855 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2856 struct iscsi_logout_rsp *hdr)
2857 {
2858 struct iscsi_conn *logout_conn = NULL;
2859 struct iscsi_conn_recovery *cr = NULL;
2860 struct iscsi_session *sess = conn->sess;
2861 /*
2862 * The actual shutting down of Sessions and/or Connections
2863 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2864 * is done in scsi_logout_post_handler().
2865 */
2866 switch (cmd->logout_reason) {
2867 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2868 pr_debug("iSCSI session logout successful, setting"
2869 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2870 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2871 break;
2872 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2873 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2874 break;
2875 /*
2876 * For CLOSECONNECTION logout requests carrying
2877 * a matching logout CID -> local CID, the reference
2878 * for the local CID will have been incremented in
2879 * iscsi_logout_closeconnection().
2880 *
2881 * For CLOSECONNECTION logout requests carrying
2882 * a different CID than the connection it arrived
2883 * on, the connection responding to cmd->logout_cid
2884 * is stopped in iscsit_logout_post_handler_diffcid().
2885 */
2886
2887 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2888 " successful.\n", cmd->logout_cid, conn->cid);
2889 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2890 break;
2891 case ISCSI_LOGOUT_REASON_RECOVERY:
2892 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2893 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2894 break;
2895 /*
2896 * If the connection is still active from our point of view
2897 * force connection recovery to occur.
2898 */
2899 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2900 cmd->logout_cid);
2901 if (logout_conn) {
2902 iscsit_connection_reinstatement_rcfr(logout_conn);
2903 iscsit_dec_conn_usage_count(logout_conn);
2904 }
2905
2906 cr = iscsit_get_inactive_connection_recovery_entry(
2907 conn->sess, cmd->logout_cid);
2908 if (!cr) {
2909 pr_err("Unable to locate CID: %hu for"
2910 " REMOVECONNFORRECOVERY Logout Request.\n",
2911 cmd->logout_cid);
2912 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2913 break;
2914 }
2915
2916 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2917
2918 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2919 " for recovery for CID: %hu on CID: %hu successful.\n",
2920 cmd->logout_cid, conn->cid);
2921 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2922 break;
2923 default:
2924 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2925 cmd->logout_reason);
2926 return -1;
2927 }
2928
2929 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2930 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2931 hdr->response = cmd->logout_response;
2932 hdr->itt = cmd->init_task_tag;
2933 cmd->stat_sn = conn->stat_sn++;
2934 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2935
2936 iscsit_increment_maxcmdsn(cmd, conn->sess);
2937 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2938 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2939
2940 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2941 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2942 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2943 cmd->logout_cid, conn->cid);
2944
2945 return 0;
2946 }
2947 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2948
2949 static int
2950 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2951 {
2952 int rc;
2953
2954 rc = iscsit_build_logout_rsp(cmd, conn,
2955 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2956 if (rc < 0)
2957 return rc;
2958
2959 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2960 }
2961
2962 void
2963 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2964 struct iscsi_nopin *hdr, bool nopout_response)
2965 {
2966 hdr->opcode = ISCSI_OP_NOOP_IN;
2967 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2968 hton24(hdr->dlength, cmd->buf_ptr_size);
2969 if (nopout_response)
2970 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2971 hdr->itt = cmd->init_task_tag;
2972 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2973 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2974 conn->stat_sn;
2975 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2976
2977 if (nopout_response)
2978 iscsit_increment_maxcmdsn(cmd, conn->sess);
2979
2980 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2981 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2982
2983 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2984 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2985 "Solicited" : "Unsolicited", cmd->init_task_tag,
2986 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2987 }
2988 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2989
2990 /*
2991 * Unsolicited NOPIN, either requesting a response or not.
2992 */
2993 static int iscsit_send_unsolicited_nopin(
2994 struct iscsi_cmd *cmd,
2995 struct iscsi_conn *conn,
2996 int want_response)
2997 {
2998 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2999 int ret;
3000
3001 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3002
3003 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3004 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3005
3006 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3007 if (ret < 0)
3008 return ret;
3009
3010 spin_lock_bh(&cmd->istate_lock);
3011 cmd->i_state = want_response ?
3012 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3013 spin_unlock_bh(&cmd->istate_lock);
3014
3015 return 0;
3016 }
3017
3018 static int
3019 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3020 {
3021 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3022
3023 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3024
3025 /*
3026 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3027 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3028 */
3029 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3030
3031 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3032 cmd->buf_ptr,
3033 cmd->buf_ptr_size);
3034 }
3035
3036 static int iscsit_send_r2t(
3037 struct iscsi_cmd *cmd,
3038 struct iscsi_conn *conn)
3039 {
3040 struct iscsi_r2t *r2t;
3041 struct iscsi_r2t_rsp *hdr;
3042 int ret;
3043
3044 r2t = iscsit_get_r2t_from_list(cmd);
3045 if (!r2t)
3046 return -1;
3047
3048 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3049 memset(hdr, 0, ISCSI_HDR_LEN);
3050 hdr->opcode = ISCSI_OP_R2T;
3051 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3052 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3053 (struct scsi_lun *)&hdr->lun);
3054 hdr->itt = cmd->init_task_tag;
3055 if (conn->conn_transport->iscsit_get_r2t_ttt)
3056 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3057 else
3058 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3059 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3060 hdr->statsn = cpu_to_be32(conn->stat_sn);
3061 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3062 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3063 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3064 hdr->data_offset = cpu_to_be32(r2t->offset);
3065 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3066
3067 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3068 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3069 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3070 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3071 r2t->offset, r2t->xfer_len, conn->cid);
3072
3073 spin_lock_bh(&cmd->r2t_lock);
3074 r2t->sent_r2t = 1;
3075 spin_unlock_bh(&cmd->r2t_lock);
3076
3077 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3078 if (ret < 0) {
3079 return ret;
3080 }
3081
3082 spin_lock_bh(&cmd->dataout_timeout_lock);
3083 iscsit_start_dataout_timer(cmd, conn);
3084 spin_unlock_bh(&cmd->dataout_timeout_lock);
3085
3086 return 0;
3087 }
3088
3089 /*
3090 * @recovery: If called from iscsi_task_reassign_complete_write() for
3091 * connection recovery.
3092 */
3093 int iscsit_build_r2ts_for_cmd(
3094 struct iscsi_conn *conn,
3095 struct iscsi_cmd *cmd,
3096 bool recovery)
3097 {
3098 int first_r2t = 1;
3099 u32 offset = 0, xfer_len = 0;
3100
3101 spin_lock_bh(&cmd->r2t_lock);
3102 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3103 spin_unlock_bh(&cmd->r2t_lock);
3104 return 0;
3105 }
3106
3107 if (conn->sess->sess_ops->DataSequenceInOrder &&
3108 !recovery)
3109 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3110
3111 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3112 if (conn->sess->sess_ops->DataSequenceInOrder) {
3113 offset = cmd->r2t_offset;
3114
3115 if (first_r2t && recovery) {
3116 int new_data_end = offset +
3117 conn->sess->sess_ops->MaxBurstLength -
3118 cmd->next_burst_len;
3119
3120 if (new_data_end > cmd->se_cmd.data_length)
3121 xfer_len = cmd->se_cmd.data_length - offset;
3122 else
3123 xfer_len =
3124 conn->sess->sess_ops->MaxBurstLength -
3125 cmd->next_burst_len;
3126 } else {
3127 int new_data_end = offset +
3128 conn->sess->sess_ops->MaxBurstLength;
3129
3130 if (new_data_end > cmd->se_cmd.data_length)
3131 xfer_len = cmd->se_cmd.data_length - offset;
3132 else
3133 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3134 }
3135 cmd->r2t_offset += xfer_len;
3136
3137 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3138 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3139 } else {
3140 struct iscsi_seq *seq;
3141
3142 seq = iscsit_get_seq_holder_for_r2t(cmd);
3143 if (!seq) {
3144 spin_unlock_bh(&cmd->r2t_lock);
3145 return -1;
3146 }
3147
3148 offset = seq->offset;
3149 xfer_len = seq->xfer_len;
3150
3151 if (cmd->seq_send_order == cmd->seq_count)
3152 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3153 }
3154 cmd->outstanding_r2ts++;
3155 first_r2t = 0;
3156
3157 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3158 spin_unlock_bh(&cmd->r2t_lock);
3159 return -1;
3160 }
3161
3162 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3163 break;
3164 }
3165 spin_unlock_bh(&cmd->r2t_lock);
3166
3167 return 0;
3168 }
3169 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3170
3171 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3172 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3173 {
3174 if (inc_stat_sn)
3175 cmd->stat_sn = conn->stat_sn++;
3176
3177 atomic_long_inc(&conn->sess->rsp_pdus);
3178
3179 memset(hdr, 0, ISCSI_HDR_LEN);
3180 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3181 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3182 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3183 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3184 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3185 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3186 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3187 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3188 }
3189 hdr->response = cmd->iscsi_response;
3190 hdr->cmd_status = cmd->se_cmd.scsi_status;
3191 hdr->itt = cmd->init_task_tag;
3192 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3193
3194 iscsit_increment_maxcmdsn(cmd, conn->sess);
3195 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3196 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3197
3198 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3199 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3200 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3201 cmd->se_cmd.scsi_status, conn->cid);
3202 }
3203 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3204
3205 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3206 {
3207 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3208 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3209 void *data_buf = NULL;
3210 u32 padding = 0, data_buf_len = 0;
3211
3212 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3213
3214 /*
3215 * Attach SENSE DATA payload to iSCSI Response PDU
3216 */
3217 if (cmd->se_cmd.sense_buffer &&
3218 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3219 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3220 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3221 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3222
3223 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3224 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3225 data_buf = cmd->sense_buffer;
3226 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3227
3228 if (padding) {
3229 memset(cmd->sense_buffer +
3230 cmd->se_cmd.scsi_sense_length, 0, padding);
3231 pr_debug("Adding %u bytes of padding to"
3232 " SENSE.\n", padding);
3233 }
3234
3235 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3236 " Response PDU\n",
3237 cmd->se_cmd.scsi_sense_length);
3238 }
3239
3240 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3241 data_buf_len);
3242 }
3243
3244 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3245 {
3246 switch (se_tmr->response) {
3247 case TMR_FUNCTION_COMPLETE:
3248 return ISCSI_TMF_RSP_COMPLETE;
3249 case TMR_TASK_DOES_NOT_EXIST:
3250 return ISCSI_TMF_RSP_NO_TASK;
3251 case TMR_LUN_DOES_NOT_EXIST:
3252 return ISCSI_TMF_RSP_NO_LUN;
3253 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3254 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3255 case TMR_FUNCTION_REJECTED:
3256 default:
3257 return ISCSI_TMF_RSP_REJECTED;
3258 }
3259 }
3260
3261 void
3262 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3263 struct iscsi_tm_rsp *hdr)
3264 {
3265 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3266
3267 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3268 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3269 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3270 hdr->itt = cmd->init_task_tag;
3271 cmd->stat_sn = conn->stat_sn++;
3272 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3273
3274 iscsit_increment_maxcmdsn(cmd, conn->sess);
3275 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3276 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3277
3278 pr_debug("Built Task Management Response ITT: 0x%08x,"
3279 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3280 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3281 }
3282 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3283
3284 static int
3285 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3286 {
3287 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3288
3289 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3290
3291 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3292 }
3293
3294 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3295 {
3296 bool ret = false;
3297
3298 if (np->np_sockaddr.ss_family == AF_INET6) {
3299 const struct sockaddr_in6 sin6 = {
3300 .sin6_addr = IN6ADDR_ANY_INIT };
3301 struct sockaddr_in6 *sock_in6 =
3302 (struct sockaddr_in6 *)&np->np_sockaddr;
3303
3304 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3305 sin6.sin6_addr.s6_addr, 16))
3306 ret = true;
3307 } else {
3308 struct sockaddr_in * sock_in =
3309 (struct sockaddr_in *)&np->np_sockaddr;
3310
3311 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3312 ret = true;
3313 }
3314
3315 return ret;
3316 }
3317
3318 #define SENDTARGETS_BUF_LIMIT 32768U
3319
3320 static int
3321 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3322 enum iscsit_transport_type network_transport,
3323 int skip_bytes, bool *completed)
3324 {
3325 char *payload = NULL;
3326 struct iscsi_conn *conn = cmd->conn;
3327 struct iscsi_portal_group *tpg;
3328 struct iscsi_tiqn *tiqn;
3329 struct iscsi_tpg_np *tpg_np;
3330 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3331 int target_name_printed;
3332 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3333 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3334 bool active;
3335
3336 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3337 SENDTARGETS_BUF_LIMIT);
3338
3339 payload = kzalloc(buffer_len, GFP_KERNEL);
3340 if (!payload)
3341 return -ENOMEM;
3342
3343 /*
3344 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3345 * explicit case..
3346 */
3347 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3348 text_ptr = strchr(text_in, '=');
3349 if (!text_ptr) {
3350 pr_err("Unable to locate '=' string in text_in:"
3351 " %s\n", text_in);
3352 kfree(payload);
3353 return -EINVAL;
3354 }
3355 /*
3356 * Skip over '=' character..
3357 */
3358 text_ptr += 1;
3359 }
3360
3361 spin_lock(&tiqn_lock);
3362 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3363 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3364 strcmp(tiqn->tiqn, text_ptr)) {
3365 continue;
3366 }
3367
3368 target_name_printed = 0;
3369
3370 spin_lock(&tiqn->tiqn_tpg_lock);
3371 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3372
3373 /* If demo_mode_discovery=0 and generate_node_acls=0
3374 * (demo mode dislabed) do not return
3375 * TargetName+TargetAddress unless a NodeACL exists.
3376 */
3377
3378 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3379 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3380 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3381 cmd->conn->sess->sess_ops->InitiatorName))) {
3382 continue;
3383 }
3384
3385 spin_lock(&tpg->tpg_state_lock);
3386 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3387 spin_unlock(&tpg->tpg_state_lock);
3388
3389 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3390 continue;
3391
3392 spin_lock(&tpg->tpg_np_lock);
3393 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3394 tpg_np_list) {
3395 struct iscsi_np *np = tpg_np->tpg_np;
3396 bool inaddr_any = iscsit_check_inaddr_any(np);
3397 struct sockaddr_storage *sockaddr;
3398
3399 if (np->np_network_transport != network_transport)
3400 continue;
3401
3402 if (!target_name_printed) {
3403 len = sprintf(buf, "TargetName=%s",
3404 tiqn->tiqn);
3405 len += 1;
3406
3407 if ((len + payload_len) > buffer_len) {
3408 spin_unlock(&tpg->tpg_np_lock);
3409 spin_unlock(&tiqn->tiqn_tpg_lock);
3410 end_of_buf = 1;
3411 goto eob;
3412 }
3413
3414 if (skip_bytes && len <= skip_bytes) {
3415 skip_bytes -= len;
3416 } else {
3417 memcpy(payload + payload_len, buf, len);
3418 payload_len += len;
3419 target_name_printed = 1;
3420 if (len > skip_bytes)
3421 skip_bytes = 0;
3422 }
3423 }
3424
3425 if (inaddr_any)
3426 sockaddr = &conn->local_sockaddr;
3427 else
3428 sockaddr = &np->np_sockaddr;
3429
3430 len = sprintf(buf, "TargetAddress="
3431 "%pISpc,%hu",
3432 sockaddr,
3433 tpg->tpgt);
3434 len += 1;
3435
3436 if ((len + payload_len) > buffer_len) {
3437 spin_unlock(&tpg->tpg_np_lock);
3438 spin_unlock(&tiqn->tiqn_tpg_lock);
3439 end_of_buf = 1;
3440 goto eob;
3441 }
3442
3443 if (skip_bytes && len <= skip_bytes) {
3444 skip_bytes -= len;
3445 } else {
3446 memcpy(payload + payload_len, buf, len);
3447 payload_len += len;
3448 if (len > skip_bytes)
3449 skip_bytes = 0;
3450 }
3451 }
3452 spin_unlock(&tpg->tpg_np_lock);
3453 }
3454 spin_unlock(&tiqn->tiqn_tpg_lock);
3455 eob:
3456 if (end_of_buf) {
3457 *completed = false;
3458 break;
3459 }
3460
3461 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3462 break;
3463 }
3464 spin_unlock(&tiqn_lock);
3465
3466 cmd->buf_ptr = payload;
3467
3468 return payload_len;
3469 }
3470
3471 int
3472 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3473 struct iscsi_text_rsp *hdr,
3474 enum iscsit_transport_type network_transport)
3475 {
3476 int text_length, padding;
3477 bool completed = true;
3478
3479 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3480 cmd->read_data_done,
3481 &completed);
3482 if (text_length < 0)
3483 return text_length;
3484
3485 if (completed) {
3486 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3487 } else {
3488 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3489 cmd->read_data_done += text_length;
3490 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3491 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3492 }
3493 hdr->opcode = ISCSI_OP_TEXT_RSP;
3494 padding = ((-text_length) & 3);
3495 hton24(hdr->dlength, text_length);
3496 hdr->itt = cmd->init_task_tag;
3497 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3498 cmd->stat_sn = conn->stat_sn++;
3499 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3500
3501 iscsit_increment_maxcmdsn(cmd, conn->sess);
3502 /*
3503 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3504 * correctly increment MaxCmdSN for each response answering a
3505 * non immediate text request with a valid CmdSN.
3506 */
3507 cmd->maxcmdsn_inc = 0;
3508 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3509 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3510
3511 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3512 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3513 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3514 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3515 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3516
3517 return text_length + padding;
3518 }
3519 EXPORT_SYMBOL(iscsit_build_text_rsp);
3520
3521 static int iscsit_send_text_rsp(
3522 struct iscsi_cmd *cmd,
3523 struct iscsi_conn *conn)
3524 {
3525 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3526 int text_length;
3527
3528 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3529 conn->conn_transport->transport_type);
3530 if (text_length < 0)
3531 return text_length;
3532
3533 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3534 cmd->buf_ptr,
3535 text_length);
3536 }
3537
3538 void
3539 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3540 struct iscsi_reject *hdr)
3541 {
3542 hdr->opcode = ISCSI_OP_REJECT;
3543 hdr->reason = cmd->reject_reason;
3544 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3545 hton24(hdr->dlength, ISCSI_HDR_LEN);
3546 hdr->ffffffff = cpu_to_be32(0xffffffff);
3547 cmd->stat_sn = conn->stat_sn++;
3548 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3549 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3550 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3551
3552 }
3553 EXPORT_SYMBOL(iscsit_build_reject);
3554
3555 static int iscsit_send_reject(
3556 struct iscsi_cmd *cmd,
3557 struct iscsi_conn *conn)
3558 {
3559 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3560
3561 iscsit_build_reject(cmd, conn, hdr);
3562
3563 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3564 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3565
3566 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3567 cmd->buf_ptr,
3568 ISCSI_HDR_LEN);
3569 }
3570
3571 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3572 {
3573 int ord, cpu;
3574 /*
3575 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3576 * within iscsit_start_kthreads()
3577 *
3578 * Here we use bitmap_id to determine which CPU that this
3579 * iSCSI connection's RX/TX threads will be scheduled to
3580 * execute upon.
3581 */
3582 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3583 for_each_online_cpu(cpu) {
3584 if (ord-- == 0) {
3585 cpumask_set_cpu(cpu, conn->conn_cpumask);
3586 return;
3587 }
3588 }
3589 /*
3590 * This should never be reached..
3591 */
3592 dump_stack();
3593 cpumask_setall(conn->conn_cpumask);
3594 }
3595
3596 int
3597 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3598 {
3599 int ret;
3600
3601 switch (state) {
3602 case ISTATE_SEND_R2T:
3603 ret = iscsit_send_r2t(cmd, conn);
3604 if (ret < 0)
3605 goto err;
3606 break;
3607 case ISTATE_REMOVE:
3608 spin_lock_bh(&conn->cmd_lock);
3609 list_del_init(&cmd->i_conn_node);
3610 spin_unlock_bh(&conn->cmd_lock);
3611
3612 iscsit_free_cmd(cmd, false);
3613 break;
3614 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3615 iscsit_mod_nopin_response_timer(conn);
3616 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3617 if (ret < 0)
3618 goto err;
3619 break;
3620 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3621 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3622 if (ret < 0)
3623 goto err;
3624 break;
3625 default:
3626 pr_err("Unknown Opcode: 0x%02x ITT:"
3627 " 0x%08x, i_state: %d on CID: %hu\n",
3628 cmd->iscsi_opcode, cmd->init_task_tag, state,
3629 conn->cid);
3630 goto err;
3631 }
3632
3633 return 0;
3634
3635 err:
3636 return -1;
3637 }
3638 EXPORT_SYMBOL(iscsit_immediate_queue);
3639
3640 static int
3641 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3642 {
3643 struct iscsit_transport *t = conn->conn_transport;
3644 struct iscsi_queue_req *qr;
3645 struct iscsi_cmd *cmd;
3646 u8 state;
3647 int ret;
3648
3649 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3650 atomic_set(&conn->check_immediate_queue, 0);
3651 cmd = qr->cmd;
3652 state = qr->state;
3653 kmem_cache_free(lio_qr_cache, qr);
3654
3655 ret = t->iscsit_immediate_queue(conn, cmd, state);
3656 if (ret < 0)
3657 return ret;
3658 }
3659
3660 return 0;
3661 }
3662
3663 int
3664 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3665 {
3666 int ret;
3667
3668 check_rsp_state:
3669 switch (state) {
3670 case ISTATE_SEND_DATAIN:
3671 ret = iscsit_send_datain(cmd, conn);
3672 if (ret < 0)
3673 goto err;
3674 else if (!ret)
3675 /* more drs */
3676 goto check_rsp_state;
3677 else if (ret == 1) {
3678 /* all done */
3679 spin_lock_bh(&cmd->istate_lock);
3680 cmd->i_state = ISTATE_SENT_STATUS;
3681 spin_unlock_bh(&cmd->istate_lock);
3682
3683 if (atomic_read(&conn->check_immediate_queue))
3684 return 1;
3685
3686 return 0;
3687 } else if (ret == 2) {
3688 /* Still must send status,
3689 SCF_TRANSPORT_TASK_SENSE was set */
3690 spin_lock_bh(&cmd->istate_lock);
3691 cmd->i_state = ISTATE_SEND_STATUS;
3692 spin_unlock_bh(&cmd->istate_lock);
3693 state = ISTATE_SEND_STATUS;
3694 goto check_rsp_state;
3695 }
3696
3697 break;
3698 case ISTATE_SEND_STATUS:
3699 case ISTATE_SEND_STATUS_RECOVERY:
3700 ret = iscsit_send_response(cmd, conn);
3701 break;
3702 case ISTATE_SEND_LOGOUTRSP:
3703 ret = iscsit_send_logout(cmd, conn);
3704 break;
3705 case ISTATE_SEND_ASYNCMSG:
3706 ret = iscsit_send_conn_drop_async_message(
3707 cmd, conn);
3708 break;
3709 case ISTATE_SEND_NOPIN:
3710 ret = iscsit_send_nopin(cmd, conn);
3711 break;
3712 case ISTATE_SEND_REJECT:
3713 ret = iscsit_send_reject(cmd, conn);
3714 break;
3715 case ISTATE_SEND_TASKMGTRSP:
3716 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3717 if (ret != 0)
3718 break;
3719 ret = iscsit_tmr_post_handler(cmd, conn);
3720 if (ret != 0)
3721 iscsit_fall_back_to_erl0(conn->sess);
3722 break;
3723 case ISTATE_SEND_TEXTRSP:
3724 ret = iscsit_send_text_rsp(cmd, conn);
3725 break;
3726 default:
3727 pr_err("Unknown Opcode: 0x%02x ITT:"
3728 " 0x%08x, i_state: %d on CID: %hu\n",
3729 cmd->iscsi_opcode, cmd->init_task_tag,
3730 state, conn->cid);
3731 goto err;
3732 }
3733 if (ret < 0)
3734 goto err;
3735
3736 switch (state) {
3737 case ISTATE_SEND_LOGOUTRSP:
3738 if (!iscsit_logout_post_handler(cmd, conn))
3739 return -ECONNRESET;
3740 /* fall through */
3741 case ISTATE_SEND_STATUS:
3742 case ISTATE_SEND_ASYNCMSG:
3743 case ISTATE_SEND_NOPIN:
3744 case ISTATE_SEND_STATUS_RECOVERY:
3745 case ISTATE_SEND_TEXTRSP:
3746 case ISTATE_SEND_TASKMGTRSP:
3747 case ISTATE_SEND_REJECT:
3748 spin_lock_bh(&cmd->istate_lock);
3749 cmd->i_state = ISTATE_SENT_STATUS;
3750 spin_unlock_bh(&cmd->istate_lock);
3751 break;
3752 default:
3753 pr_err("Unknown Opcode: 0x%02x ITT:"
3754 " 0x%08x, i_state: %d on CID: %hu\n",
3755 cmd->iscsi_opcode, cmd->init_task_tag,
3756 cmd->i_state, conn->cid);
3757 goto err;
3758 }
3759
3760 if (atomic_read(&conn->check_immediate_queue))
3761 return 1;
3762
3763 return 0;
3764
3765 err:
3766 return -1;
3767 }
3768 EXPORT_SYMBOL(iscsit_response_queue);
3769
3770 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3771 {
3772 struct iscsit_transport *t = conn->conn_transport;
3773 struct iscsi_queue_req *qr;
3774 struct iscsi_cmd *cmd;
3775 u8 state;
3776 int ret;
3777
3778 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3779 cmd = qr->cmd;
3780 state = qr->state;
3781 kmem_cache_free(lio_qr_cache, qr);
3782
3783 ret = t->iscsit_response_queue(conn, cmd, state);
3784 if (ret == 1 || ret < 0)
3785 return ret;
3786 }
3787
3788 return 0;
3789 }
3790
3791 int iscsi_target_tx_thread(void *arg)
3792 {
3793 int ret = 0;
3794 struct iscsi_conn *conn = arg;
3795 bool conn_freed = false;
3796
3797 /*
3798 * Allow ourselves to be interrupted by SIGINT so that a
3799 * connection recovery / failure event can be triggered externally.
3800 */
3801 allow_signal(SIGINT);
3802
3803 while (!kthread_should_stop()) {
3804 /*
3805 * Ensure that both TX and RX per connection kthreads
3806 * are scheduled to run on the same CPU.
3807 */
3808 iscsit_thread_check_cpumask(conn, current, 1);
3809
3810 wait_event_interruptible(conn->queues_wq,
3811 !iscsit_conn_all_queues_empty(conn));
3812
3813 if (signal_pending(current))
3814 goto transport_err;
3815
3816 get_immediate:
3817 ret = iscsit_handle_immediate_queue(conn);
3818 if (ret < 0)
3819 goto transport_err;
3820
3821 ret = iscsit_handle_response_queue(conn);
3822 if (ret == 1) {
3823 goto get_immediate;
3824 } else if (ret == -ECONNRESET) {
3825 conn_freed = true;
3826 goto out;
3827 } else if (ret < 0) {
3828 goto transport_err;
3829 }
3830 }
3831
3832 transport_err:
3833 /*
3834 * Avoid the normal connection failure code-path if this connection
3835 * is still within LOGIN mode, and iscsi_np process context is
3836 * responsible for cleaning up the early connection failure.
3837 */
3838 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3839 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3840 out:
3841 if (!conn_freed) {
3842 while (!kthread_should_stop()) {
3843 msleep(100);
3844 }
3845 }
3846 return 0;
3847 }
3848
3849 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3850 {
3851 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3852 struct iscsi_cmd *cmd;
3853 int ret = 0;
3854
3855 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3856 case ISCSI_OP_SCSI_CMD:
3857 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3858 if (!cmd)
3859 goto reject;
3860
3861 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3862 break;
3863 case ISCSI_OP_SCSI_DATA_OUT:
3864 ret = iscsit_handle_data_out(conn, buf);
3865 break;
3866 case ISCSI_OP_NOOP_OUT:
3867 cmd = NULL;
3868 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3869 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3870 if (!cmd)
3871 goto reject;
3872 }
3873 ret = iscsit_handle_nop_out(conn, cmd, buf);
3874 break;
3875 case ISCSI_OP_SCSI_TMFUNC:
3876 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3877 if (!cmd)
3878 goto reject;
3879
3880 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3881 break;
3882 case ISCSI_OP_TEXT:
3883 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3884 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3885 if (!cmd)
3886 goto reject;
3887 } else {
3888 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3889 if (!cmd)
3890 goto reject;
3891 }
3892
3893 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3894 break;
3895 case ISCSI_OP_LOGOUT:
3896 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3897 if (!cmd)
3898 goto reject;
3899
3900 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3901 if (ret > 0)
3902 wait_for_completion_timeout(&conn->conn_logout_comp,
3903 SECONDS_FOR_LOGOUT_COMP * HZ);
3904 break;
3905 case ISCSI_OP_SNACK:
3906 ret = iscsit_handle_snack(conn, buf);
3907 break;
3908 default:
3909 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3910 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3911 pr_err("Cannot recover from unknown"
3912 " opcode while ERL=0, closing iSCSI connection.\n");
3913 return -1;
3914 }
3915 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3916 " closing iSCSI connection.\n");
3917 ret = -1;
3918 break;
3919 }
3920
3921 return ret;
3922 reject:
3923 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3924 }
3925
3926 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3927 {
3928 bool ret;
3929
3930 spin_lock_bh(&conn->state_lock);
3931 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3932 spin_unlock_bh(&conn->state_lock);
3933
3934 return ret;
3935 }
3936
3937 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3938 {
3939 int ret;
3940 u8 buffer[ISCSI_HDR_LEN], opcode;
3941 u32 checksum = 0, digest = 0;
3942 struct kvec iov;
3943
3944 while (!kthread_should_stop()) {
3945 /*
3946 * Ensure that both TX and RX per connection kthreads
3947 * are scheduled to run on the same CPU.
3948 */
3949 iscsit_thread_check_cpumask(conn, current, 0);
3950
3951 memset(buffer, 0, ISCSI_HDR_LEN);
3952 memset(&iov, 0, sizeof(struct kvec));
3953
3954 iov.iov_base = buffer;
3955 iov.iov_len = ISCSI_HDR_LEN;
3956
3957 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3958 if (ret != ISCSI_HDR_LEN) {
3959 iscsit_rx_thread_wait_for_tcp(conn);
3960 return;
3961 }
3962
3963 if (conn->conn_ops->HeaderDigest) {
3964 iov.iov_base = &digest;
3965 iov.iov_len = ISCSI_CRC_LEN;
3966
3967 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3968 if (ret != ISCSI_CRC_LEN) {
3969 iscsit_rx_thread_wait_for_tcp(conn);
3970 return;
3971 }
3972
3973 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3974 ISCSI_HDR_LEN, 0, NULL,
3975 &checksum);
3976
3977 if (digest != checksum) {
3978 pr_err("HeaderDigest CRC32C failed,"
3979 " received 0x%08x, computed 0x%08x\n",
3980 digest, checksum);
3981 /*
3982 * Set the PDU to 0xff so it will intentionally
3983 * hit default in the switch below.
3984 */
3985 memset(buffer, 0xff, ISCSI_HDR_LEN);
3986 atomic_long_inc(&conn->sess->conn_digest_errors);
3987 } else {
3988 pr_debug("Got HeaderDigest CRC32C"
3989 " 0x%08x\n", checksum);
3990 }
3991 }
3992
3993 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3994 return;
3995
3996 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3997
3998 if (conn->sess->sess_ops->SessionType &&
3999 ((!(opcode & ISCSI_OP_TEXT)) ||
4000 (!(opcode & ISCSI_OP_LOGOUT)))) {
4001 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4002 " while in Discovery Session, rejecting.\n", opcode);
4003 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4004 buffer);
4005 return;
4006 }
4007
4008 ret = iscsi_target_rx_opcode(conn, buffer);
4009 if (ret < 0)
4010 return;
4011 }
4012 }
4013
4014 int iscsi_target_rx_thread(void *arg)
4015 {
4016 int rc;
4017 struct iscsi_conn *conn = arg;
4018 bool conn_freed = false;
4019
4020 /*
4021 * Allow ourselves to be interrupted by SIGINT so that a
4022 * connection recovery / failure event can be triggered externally.
4023 */
4024 allow_signal(SIGINT);
4025 /*
4026 * Wait for iscsi_post_login_handler() to complete before allowing
4027 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4028 */
4029 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4030 if (rc < 0 || iscsi_target_check_conn_state(conn))
4031 goto out;
4032
4033 if (!conn->conn_transport->iscsit_get_rx_pdu)
4034 return 0;
4035
4036 conn->conn_transport->iscsit_get_rx_pdu(conn);
4037
4038 if (!signal_pending(current))
4039 atomic_set(&conn->transport_failed, 1);
4040 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4041
4042 out:
4043 if (!conn_freed) {
4044 while (!kthread_should_stop()) {
4045 msleep(100);
4046 }
4047 }
4048
4049 return 0;
4050 }
4051
4052 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4053 {
4054 LIST_HEAD(tmp_list);
4055 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4056 struct iscsi_session *sess = conn->sess;
4057 /*
4058 * We expect this function to only ever be called from either RX or TX
4059 * thread context via iscsit_close_connection() once the other context
4060 * has been reset -> returned sleeping pre-handler state.
4061 */
4062 spin_lock_bh(&conn->cmd_lock);
4063 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4064
4065 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4066 struct se_cmd *se_cmd = &cmd->se_cmd;
4067
4068 if (se_cmd->se_tfo != NULL) {
4069 spin_lock(&se_cmd->t_state_lock);
4070 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4071 spin_unlock(&se_cmd->t_state_lock);
4072 }
4073 }
4074 spin_unlock_bh(&conn->cmd_lock);
4075
4076 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4077 list_del_init(&cmd->i_conn_node);
4078
4079 iscsit_increment_maxcmdsn(cmd, sess);
4080 iscsit_free_cmd(cmd, true);
4081
4082 }
4083 }
4084
4085 static void iscsit_stop_timers_for_cmds(
4086 struct iscsi_conn *conn)
4087 {
4088 struct iscsi_cmd *cmd;
4089
4090 spin_lock_bh(&conn->cmd_lock);
4091 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4092 if (cmd->data_direction == DMA_TO_DEVICE)
4093 iscsit_stop_dataout_timer(cmd);
4094 }
4095 spin_unlock_bh(&conn->cmd_lock);
4096 }
4097
4098 int iscsit_close_connection(
4099 struct iscsi_conn *conn)
4100 {
4101 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4102 struct iscsi_session *sess = conn->sess;
4103
4104 pr_debug("Closing iSCSI connection CID %hu on SID:"
4105 " %u\n", conn->cid, sess->sid);
4106 /*
4107 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4108 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4109 * sleeping and the logout response never got sent because the
4110 * connection failed.
4111 *
4112 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4113 * to signal logout response TX interrupt completion. Go ahead and skip
4114 * this for iser since isert_rx_opcode() does not wait on logout failure,
4115 * and to avoid iscsi_conn pointer dereference in iser-target code.
4116 */
4117 if (!conn->conn_transport->rdma_shutdown)
4118 complete(&conn->conn_logout_comp);
4119
4120 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4121 if (conn->tx_thread &&
4122 cmpxchg(&conn->tx_thread_active, true, false)) {
4123 send_sig(SIGINT, conn->tx_thread, 1);
4124 kthread_stop(conn->tx_thread);
4125 }
4126 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4127 if (conn->rx_thread &&
4128 cmpxchg(&conn->rx_thread_active, true, false)) {
4129 send_sig(SIGINT, conn->rx_thread, 1);
4130 kthread_stop(conn->rx_thread);
4131 }
4132 }
4133
4134 spin_lock(&iscsit_global->ts_bitmap_lock);
4135 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4136 get_order(1));
4137 spin_unlock(&iscsit_global->ts_bitmap_lock);
4138
4139 iscsit_stop_timers_for_cmds(conn);
4140 iscsit_stop_nopin_response_timer(conn);
4141 iscsit_stop_nopin_timer(conn);
4142
4143 if (conn->conn_transport->iscsit_wait_conn)
4144 conn->conn_transport->iscsit_wait_conn(conn);
4145
4146 /*
4147 * During Connection recovery drop unacknowledged out of order
4148 * commands for this connection, and prepare the other commands
4149 * for reallegiance.
4150 *
4151 * During normal operation clear the out of order commands (but
4152 * do not free the struct iscsi_ooo_cmdsn's) and release all
4153 * struct iscsi_cmds.
4154 */
4155 if (atomic_read(&conn->connection_recovery)) {
4156 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4157 iscsit_prepare_cmds_for_reallegiance(conn);
4158 } else {
4159 iscsit_clear_ooo_cmdsns_for_conn(conn);
4160 iscsit_release_commands_from_conn(conn);
4161 }
4162 iscsit_free_queue_reqs_for_conn(conn);
4163
4164 /*
4165 * Handle decrementing session or connection usage count if
4166 * a logout response was not able to be sent because the
4167 * connection failed. Fall back to Session Recovery here.
4168 */
4169 if (atomic_read(&conn->conn_logout_remove)) {
4170 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4171 iscsit_dec_conn_usage_count(conn);
4172 iscsit_dec_session_usage_count(sess);
4173 }
4174 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4175 iscsit_dec_conn_usage_count(conn);
4176
4177 atomic_set(&conn->conn_logout_remove, 0);
4178 atomic_set(&sess->session_reinstatement, 0);
4179 atomic_set(&sess->session_fall_back_to_erl0, 1);
4180 }
4181
4182 spin_lock_bh(&sess->conn_lock);
4183 list_del(&conn->conn_list);
4184
4185 /*
4186 * Attempt to let the Initiator know this connection failed by
4187 * sending an Connection Dropped Async Message on another
4188 * active connection.
4189 */
4190 if (atomic_read(&conn->connection_recovery))
4191 iscsit_build_conn_drop_async_message(conn);
4192
4193 spin_unlock_bh(&sess->conn_lock);
4194
4195 /*
4196 * If connection reinstatement is being performed on this connection,
4197 * up the connection reinstatement semaphore that is being blocked on
4198 * in iscsit_cause_connection_reinstatement().
4199 */
4200 spin_lock_bh(&conn->state_lock);
4201 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4202 spin_unlock_bh(&conn->state_lock);
4203 complete(&conn->conn_wait_comp);
4204 wait_for_completion(&conn->conn_post_wait_comp);
4205 spin_lock_bh(&conn->state_lock);
4206 }
4207
4208 /*
4209 * If connection reinstatement is being performed on this connection
4210 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4211 * connection wait rcfr semaphore that is being blocked on
4212 * an iscsit_connection_reinstatement_rcfr().
4213 */
4214 if (atomic_read(&conn->connection_wait_rcfr)) {
4215 spin_unlock_bh(&conn->state_lock);
4216 complete(&conn->conn_wait_rcfr_comp);
4217 wait_for_completion(&conn->conn_post_wait_comp);
4218 spin_lock_bh(&conn->state_lock);
4219 }
4220 atomic_set(&conn->connection_reinstatement, 1);
4221 spin_unlock_bh(&conn->state_lock);
4222
4223 /*
4224 * If any other processes are accessing this connection pointer we
4225 * must wait until they have completed.
4226 */
4227 iscsit_check_conn_usage_count(conn);
4228
4229 ahash_request_free(conn->conn_tx_hash);
4230 if (conn->conn_rx_hash) {
4231 struct crypto_ahash *tfm;
4232
4233 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4234 ahash_request_free(conn->conn_rx_hash);
4235 crypto_free_ahash(tfm);
4236 }
4237
4238 free_cpumask_var(conn->conn_cpumask);
4239
4240 kfree(conn->conn_ops);
4241 conn->conn_ops = NULL;
4242
4243 if (conn->sock)
4244 sock_release(conn->sock);
4245
4246 if (conn->conn_transport->iscsit_free_conn)
4247 conn->conn_transport->iscsit_free_conn(conn);
4248
4249 iscsit_put_transport(conn->conn_transport);
4250
4251 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4252 conn->conn_state = TARG_CONN_STATE_FREE;
4253 kfree(conn);
4254
4255 spin_lock_bh(&sess->conn_lock);
4256 atomic_dec(&sess->nconn);
4257 pr_debug("Decremented iSCSI connection count to %hu from node:"
4258 " %s\n", atomic_read(&sess->nconn),
4259 sess->sess_ops->InitiatorName);
4260 /*
4261 * Make sure that if one connection fails in an non ERL=2 iSCSI
4262 * Session that they all fail.
4263 */
4264 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4265 !atomic_read(&sess->session_logout))
4266 atomic_set(&sess->session_fall_back_to_erl0, 1);
4267
4268 /*
4269 * If this was not the last connection in the session, and we are
4270 * performing session reinstatement or falling back to ERL=0, call
4271 * iscsit_stop_session() without sleeping to shutdown the other
4272 * active connections.
4273 */
4274 if (atomic_read(&sess->nconn)) {
4275 if (!atomic_read(&sess->session_reinstatement) &&
4276 !atomic_read(&sess->session_fall_back_to_erl0)) {
4277 spin_unlock_bh(&sess->conn_lock);
4278 return 0;
4279 }
4280 if (!atomic_read(&sess->session_stop_active)) {
4281 atomic_set(&sess->session_stop_active, 1);
4282 spin_unlock_bh(&sess->conn_lock);
4283 iscsit_stop_session(sess, 0, 0);
4284 return 0;
4285 }
4286 spin_unlock_bh(&sess->conn_lock);
4287 return 0;
4288 }
4289
4290 /*
4291 * If this was the last connection in the session and one of the
4292 * following is occurring:
4293 *
4294 * Session Reinstatement is not being performed, and are falling back
4295 * to ERL=0 call iscsit_close_session().
4296 *
4297 * Session Logout was requested. iscsit_close_session() will be called
4298 * elsewhere.
4299 *
4300 * Session Continuation is not being performed, start the Time2Retain
4301 * handler and check if sleep_on_sess_wait_sem is active.
4302 */
4303 if (!atomic_read(&sess->session_reinstatement) &&
4304 atomic_read(&sess->session_fall_back_to_erl0)) {
4305 spin_unlock_bh(&sess->conn_lock);
4306 iscsit_close_session(sess);
4307
4308 return 0;
4309 } else if (atomic_read(&sess->session_logout)) {
4310 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4311 sess->session_state = TARG_SESS_STATE_FREE;
4312 spin_unlock_bh(&sess->conn_lock);
4313
4314 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4315 complete(&sess->session_wait_comp);
4316
4317 return 0;
4318 } else {
4319 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4320 sess->session_state = TARG_SESS_STATE_FAILED;
4321
4322 if (!atomic_read(&sess->session_continuation)) {
4323 spin_unlock_bh(&sess->conn_lock);
4324 iscsit_start_time2retain_handler(sess);
4325 } else
4326 spin_unlock_bh(&sess->conn_lock);
4327
4328 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4329 complete(&sess->session_wait_comp);
4330
4331 return 0;
4332 }
4333 }
4334
4335 /*
4336 * If the iSCSI Session for the iSCSI Initiator Node exists,
4337 * forcefully shutdown the iSCSI NEXUS.
4338 */
4339 int iscsit_close_session(struct iscsi_session *sess)
4340 {
4341 struct iscsi_portal_group *tpg = sess->tpg;
4342 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4343
4344 if (atomic_read(&sess->nconn)) {
4345 pr_err("%d connection(s) still exist for iSCSI session"
4346 " to %s\n", atomic_read(&sess->nconn),
4347 sess->sess_ops->InitiatorName);
4348 BUG();
4349 }
4350
4351 spin_lock_bh(&se_tpg->session_lock);
4352 atomic_set(&sess->session_logout, 1);
4353 atomic_set(&sess->session_reinstatement, 1);
4354 iscsit_stop_time2retain_timer(sess);
4355 spin_unlock_bh(&se_tpg->session_lock);
4356
4357 /*
4358 * transport_deregister_session_configfs() will clear the
4359 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4360 * can be setting it again with __transport_register_session() in
4361 * iscsi_post_login_handler() again after the iscsit_stop_session()
4362 * completes in iscsi_np context.
4363 */
4364 transport_deregister_session_configfs(sess->se_sess);
4365
4366 /*
4367 * If any other processes are accessing this session pointer we must
4368 * wait until they have completed. If we are in an interrupt (the
4369 * time2retain handler) and contain and active session usage count we
4370 * restart the timer and exit.
4371 */
4372 if (!in_interrupt()) {
4373 if (iscsit_check_session_usage_count(sess) == 1)
4374 iscsit_stop_session(sess, 1, 1);
4375 } else {
4376 if (iscsit_check_session_usage_count(sess) == 2) {
4377 atomic_set(&sess->session_logout, 0);
4378 iscsit_start_time2retain_handler(sess);
4379 return 0;
4380 }
4381 }
4382
4383 transport_deregister_session(sess->se_sess);
4384
4385 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4386 iscsit_free_connection_recovery_entires(sess);
4387
4388 iscsit_free_all_ooo_cmdsns(sess);
4389
4390 spin_lock_bh(&se_tpg->session_lock);
4391 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4392 sess->session_state = TARG_SESS_STATE_FREE;
4393 pr_debug("Released iSCSI session from node: %s\n",
4394 sess->sess_ops->InitiatorName);
4395 tpg->nsessions--;
4396 if (tpg->tpg_tiqn)
4397 tpg->tpg_tiqn->tiqn_nsessions--;
4398
4399 pr_debug("Decremented number of active iSCSI Sessions on"
4400 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4401
4402 spin_lock(&sess_idr_lock);
4403 idr_remove(&sess_idr, sess->session_index);
4404 spin_unlock(&sess_idr_lock);
4405
4406 kfree(sess->sess_ops);
4407 sess->sess_ops = NULL;
4408 spin_unlock_bh(&se_tpg->session_lock);
4409
4410 kfree(sess);
4411 return 0;
4412 }
4413
4414 static void iscsit_logout_post_handler_closesession(
4415 struct iscsi_conn *conn)
4416 {
4417 struct iscsi_session *sess = conn->sess;
4418 int sleep = 1;
4419 /*
4420 * Traditional iscsi/tcp will invoke this logic from TX thread
4421 * context during session logout, so clear tx_thread_active and
4422 * sleep if iscsit_close_connection() has not already occured.
4423 *
4424 * Since iser-target invokes this logic from it's own workqueue,
4425 * always sleep waiting for RX/TX thread shutdown to complete
4426 * within iscsit_close_connection().
4427 */
4428 if (!conn->conn_transport->rdma_shutdown) {
4429 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4430 if (!sleep)
4431 return;
4432 }
4433
4434 atomic_set(&conn->conn_logout_remove, 0);
4435 complete(&conn->conn_logout_comp);
4436
4437 iscsit_dec_conn_usage_count(conn);
4438 iscsit_stop_session(sess, sleep, sleep);
4439 iscsit_dec_session_usage_count(sess);
4440 iscsit_close_session(sess);
4441 }
4442
4443 static void iscsit_logout_post_handler_samecid(
4444 struct iscsi_conn *conn)
4445 {
4446 int sleep = 1;
4447
4448 if (!conn->conn_transport->rdma_shutdown) {
4449 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4450 if (!sleep)
4451 return;
4452 }
4453
4454 atomic_set(&conn->conn_logout_remove, 0);
4455 complete(&conn->conn_logout_comp);
4456
4457 iscsit_cause_connection_reinstatement(conn, sleep);
4458 iscsit_dec_conn_usage_count(conn);
4459 }
4460
4461 static void iscsit_logout_post_handler_diffcid(
4462 struct iscsi_conn *conn,
4463 u16 cid)
4464 {
4465 struct iscsi_conn *l_conn;
4466 struct iscsi_session *sess = conn->sess;
4467 bool conn_found = false;
4468
4469 if (!sess)
4470 return;
4471
4472 spin_lock_bh(&sess->conn_lock);
4473 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4474 if (l_conn->cid == cid) {
4475 iscsit_inc_conn_usage_count(l_conn);
4476 conn_found = true;
4477 break;
4478 }
4479 }
4480 spin_unlock_bh(&sess->conn_lock);
4481
4482 if (!conn_found)
4483 return;
4484
4485 if (l_conn->sock)
4486 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4487
4488 spin_lock_bh(&l_conn->state_lock);
4489 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4490 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4491 spin_unlock_bh(&l_conn->state_lock);
4492
4493 iscsit_cause_connection_reinstatement(l_conn, 1);
4494 iscsit_dec_conn_usage_count(l_conn);
4495 }
4496
4497 /*
4498 * Return of 0 causes the TX thread to restart.
4499 */
4500 int iscsit_logout_post_handler(
4501 struct iscsi_cmd *cmd,
4502 struct iscsi_conn *conn)
4503 {
4504 int ret = 0;
4505
4506 switch (cmd->logout_reason) {
4507 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4508 switch (cmd->logout_response) {
4509 case ISCSI_LOGOUT_SUCCESS:
4510 case ISCSI_LOGOUT_CLEANUP_FAILED:
4511 default:
4512 iscsit_logout_post_handler_closesession(conn);
4513 break;
4514 }
4515 ret = 0;
4516 break;
4517 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4518 if (conn->cid == cmd->logout_cid) {
4519 switch (cmd->logout_response) {
4520 case ISCSI_LOGOUT_SUCCESS:
4521 case ISCSI_LOGOUT_CLEANUP_FAILED:
4522 default:
4523 iscsit_logout_post_handler_samecid(conn);
4524 break;
4525 }
4526 ret = 0;
4527 } else {
4528 switch (cmd->logout_response) {
4529 case ISCSI_LOGOUT_SUCCESS:
4530 iscsit_logout_post_handler_diffcid(conn,
4531 cmd->logout_cid);
4532 break;
4533 case ISCSI_LOGOUT_CID_NOT_FOUND:
4534 case ISCSI_LOGOUT_CLEANUP_FAILED:
4535 default:
4536 break;
4537 }
4538 ret = 1;
4539 }
4540 break;
4541 case ISCSI_LOGOUT_REASON_RECOVERY:
4542 switch (cmd->logout_response) {
4543 case ISCSI_LOGOUT_SUCCESS:
4544 case ISCSI_LOGOUT_CID_NOT_FOUND:
4545 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4546 case ISCSI_LOGOUT_CLEANUP_FAILED:
4547 default:
4548 break;
4549 }
4550 ret = 1;
4551 break;
4552 default:
4553 break;
4554
4555 }
4556 return ret;
4557 }
4558 EXPORT_SYMBOL(iscsit_logout_post_handler);
4559
4560 void iscsit_fail_session(struct iscsi_session *sess)
4561 {
4562 struct iscsi_conn *conn;
4563
4564 spin_lock_bh(&sess->conn_lock);
4565 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4566 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4567 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4568 }
4569 spin_unlock_bh(&sess->conn_lock);
4570
4571 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4572 sess->session_state = TARG_SESS_STATE_FAILED;
4573 }
4574
4575 int iscsit_free_session(struct iscsi_session *sess)
4576 {
4577 u16 conn_count = atomic_read(&sess->nconn);
4578 struct iscsi_conn *conn, *conn_tmp = NULL;
4579 int is_last;
4580
4581 spin_lock_bh(&sess->conn_lock);
4582 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4583
4584 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4585 conn_list) {
4586 if (conn_count == 0)
4587 break;
4588
4589 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4590 is_last = 1;
4591 } else {
4592 iscsit_inc_conn_usage_count(conn_tmp);
4593 is_last = 0;
4594 }
4595 iscsit_inc_conn_usage_count(conn);
4596
4597 spin_unlock_bh(&sess->conn_lock);
4598 iscsit_cause_connection_reinstatement(conn, 1);
4599 spin_lock_bh(&sess->conn_lock);
4600
4601 iscsit_dec_conn_usage_count(conn);
4602 if (is_last == 0)
4603 iscsit_dec_conn_usage_count(conn_tmp);
4604
4605 conn_count--;
4606 }
4607
4608 if (atomic_read(&sess->nconn)) {
4609 spin_unlock_bh(&sess->conn_lock);
4610 wait_for_completion(&sess->session_wait_comp);
4611 } else
4612 spin_unlock_bh(&sess->conn_lock);
4613
4614 iscsit_close_session(sess);
4615 return 0;
4616 }
4617
4618 void iscsit_stop_session(
4619 struct iscsi_session *sess,
4620 int session_sleep,
4621 int connection_sleep)
4622 {
4623 u16 conn_count = atomic_read(&sess->nconn);
4624 struct iscsi_conn *conn, *conn_tmp = NULL;
4625 int is_last;
4626
4627 spin_lock_bh(&sess->conn_lock);
4628 if (session_sleep)
4629 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4630
4631 if (connection_sleep) {
4632 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4633 conn_list) {
4634 if (conn_count == 0)
4635 break;
4636
4637 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4638 is_last = 1;
4639 } else {
4640 iscsit_inc_conn_usage_count(conn_tmp);
4641 is_last = 0;
4642 }
4643 iscsit_inc_conn_usage_count(conn);
4644
4645 spin_unlock_bh(&sess->conn_lock);
4646 iscsit_cause_connection_reinstatement(conn, 1);
4647 spin_lock_bh(&sess->conn_lock);
4648
4649 iscsit_dec_conn_usage_count(conn);
4650 if (is_last == 0)
4651 iscsit_dec_conn_usage_count(conn_tmp);
4652 conn_count--;
4653 }
4654 } else {
4655 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4656 iscsit_cause_connection_reinstatement(conn, 0);
4657 }
4658
4659 if (session_sleep && atomic_read(&sess->nconn)) {
4660 spin_unlock_bh(&sess->conn_lock);
4661 wait_for_completion(&sess->session_wait_comp);
4662 } else
4663 spin_unlock_bh(&sess->conn_lock);
4664 }
4665
4666 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4667 {
4668 struct iscsi_session *sess;
4669 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4670 struct se_session *se_sess, *se_sess_tmp;
4671 LIST_HEAD(free_list);
4672 int session_count = 0;
4673
4674 spin_lock_bh(&se_tpg->session_lock);
4675 if (tpg->nsessions && !force) {
4676 spin_unlock_bh(&se_tpg->session_lock);
4677 return -1;
4678 }
4679
4680 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4681 sess_list) {
4682 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4683
4684 spin_lock(&sess->conn_lock);
4685 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4686 atomic_read(&sess->session_logout) ||
4687 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4688 spin_unlock(&sess->conn_lock);
4689 continue;
4690 }
4691 atomic_set(&sess->session_reinstatement, 1);
4692 atomic_set(&sess->session_fall_back_to_erl0, 1);
4693 spin_unlock(&sess->conn_lock);
4694
4695 list_move_tail(&se_sess->sess_list, &free_list);
4696 }
4697 spin_unlock_bh(&se_tpg->session_lock);
4698
4699 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4700 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4701
4702 iscsit_free_session(sess);
4703 session_count++;
4704 }
4705
4706 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4707 " Group: %hu\n", session_count, tpg->tpgt);
4708 return 0;
4709 }
4710
4711 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4712 MODULE_VERSION("4.1.x");
4713 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4714 MODULE_LICENSE("GPL");
4715
4716 module_init(iscsi_target_init_module);
4717 module_exit(iscsi_target_cleanup_module);
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