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Merge branch 'r6040-next'
[linux/fpc-iii.git] / drivers / target / iscsi / iscsi_target.c
blob50f3d3a0dd7b93d4e8789913997ebd67eeb70425
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 <asm/unaligned.h>
27 #include <scsi/scsi_proto.h>
28 #include <scsi/iscsi_proto.h>
29 #include <scsi/scsi_tcq.h>
30 #include <target/target_core_base.h>
31 #include <target/target_core_fabric.h>
32
33 #include <target/iscsi/iscsi_target_core.h>
34 #include "iscsi_target_parameters.h"
35 #include "iscsi_target_seq_pdu_list.h"
36 #include "iscsi_target_datain_values.h"
37 #include "iscsi_target_erl0.h"
38 #include "iscsi_target_erl1.h"
39 #include "iscsi_target_erl2.h"
40 #include "iscsi_target_login.h"
41 #include "iscsi_target_tmr.h"
42 #include "iscsi_target_tpg.h"
43 #include "iscsi_target_util.h"
44 #include "iscsi_target.h"
45 #include "iscsi_target_device.h"
46 #include <target/iscsi/iscsi_target_stat.h>
47
48 #include <target/iscsi/iscsi_transport.h>
49
50 static LIST_HEAD(g_tiqn_list);
51 static LIST_HEAD(g_np_list);
52 static DEFINE_SPINLOCK(tiqn_lock);
53 static DEFINE_MUTEX(np_lock);
54
55 static struct idr tiqn_idr;
56 struct idr sess_idr;
57 struct mutex auth_id_lock;
58 spinlock_t sess_idr_lock;
59
60 struct iscsit_global *iscsit_global;
61
62 struct kmem_cache *lio_qr_cache;
63 struct kmem_cache *lio_dr_cache;
64 struct kmem_cache *lio_ooo_cache;
65 struct kmem_cache *lio_r2t_cache;
66
67 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
68 struct iscsi_scsi_req *, u32);
69
70 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
71 {
72 struct iscsi_tiqn *tiqn = NULL;
73
74 spin_lock(&tiqn_lock);
75 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
76 if (!strcmp(tiqn->tiqn, buf)) {
77
78 spin_lock(&tiqn->tiqn_state_lock);
79 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
80 tiqn->tiqn_access_count++;
81 spin_unlock(&tiqn->tiqn_state_lock);
82 spin_unlock(&tiqn_lock);
83 return tiqn;
84 }
85 spin_unlock(&tiqn->tiqn_state_lock);
86 }
87 }
88 spin_unlock(&tiqn_lock);
89
90 return NULL;
91 }
92
93 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
94 {
95 spin_lock(&tiqn->tiqn_state_lock);
96 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
97 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
98 spin_unlock(&tiqn->tiqn_state_lock);
99 return 0;
100 }
101 spin_unlock(&tiqn->tiqn_state_lock);
102
103 return -1;
104 }
105
106 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
107 {
108 spin_lock(&tiqn->tiqn_state_lock);
109 tiqn->tiqn_access_count--;
110 spin_unlock(&tiqn->tiqn_state_lock);
111 }
112
113 /*
114 * Note that IQN formatting is expected to be done in userspace, and
115 * no explict IQN format checks are done here.
116 */
117 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
118 {
119 struct iscsi_tiqn *tiqn = NULL;
120 int ret;
121
122 if (strlen(buf) >= ISCSI_IQN_LEN) {
123 pr_err("Target IQN exceeds %d bytes\n",
124 ISCSI_IQN_LEN);
125 return ERR_PTR(-EINVAL);
126 }
127
128 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
129 if (!tiqn) {
130 pr_err("Unable to allocate struct iscsi_tiqn\n");
131 return ERR_PTR(-ENOMEM);
132 }
133
134 sprintf(tiqn->tiqn, "%s", buf);
135 INIT_LIST_HEAD(&tiqn->tiqn_list);
136 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
137 spin_lock_init(&tiqn->tiqn_state_lock);
138 spin_lock_init(&tiqn->tiqn_tpg_lock);
139 spin_lock_init(&tiqn->sess_err_stats.lock);
140 spin_lock_init(&tiqn->login_stats.lock);
141 spin_lock_init(&tiqn->logout_stats.lock);
142
143 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
144
145 idr_preload(GFP_KERNEL);
146 spin_lock(&tiqn_lock);
147
148 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
149 if (ret < 0) {
150 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
151 spin_unlock(&tiqn_lock);
152 idr_preload_end();
153 kfree(tiqn);
154 return ERR_PTR(ret);
155 }
156 tiqn->tiqn_index = ret;
157 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
158
159 spin_unlock(&tiqn_lock);
160 idr_preload_end();
161
162 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
163
164 return tiqn;
165
166 }
167
168 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
169 {
170 /*
171 * Wait for accesses to said struct iscsi_tiqn to end.
172 */
173 spin_lock(&tiqn->tiqn_state_lock);
174 while (tiqn->tiqn_access_count != 0) {
175 spin_unlock(&tiqn->tiqn_state_lock);
176 msleep(10);
177 spin_lock(&tiqn->tiqn_state_lock);
178 }
179 spin_unlock(&tiqn->tiqn_state_lock);
180 }
181
182 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
183 {
184 /*
185 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
186 * while holding tiqn->tiqn_state_lock. This means that all subsequent
187 * attempts to access this struct iscsi_tiqn will fail from both transport
188 * fabric and control code paths.
189 */
190 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
191 pr_err("iscsit_set_tiqn_shutdown() failed\n");
192 return;
193 }
194
195 iscsit_wait_for_tiqn(tiqn);
196
197 spin_lock(&tiqn_lock);
198 list_del(&tiqn->tiqn_list);
199 idr_remove(&tiqn_idr, tiqn->tiqn_index);
200 spin_unlock(&tiqn_lock);
201
202 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
203 tiqn->tiqn);
204 kfree(tiqn);
205 }
206
207 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
208 {
209 int ret;
210 /*
211 * Determine if the network portal is accepting storage traffic.
212 */
213 spin_lock_bh(&np->np_thread_lock);
214 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
215 spin_unlock_bh(&np->np_thread_lock);
216 return -1;
217 }
218 spin_unlock_bh(&np->np_thread_lock);
219 /*
220 * Determine if the portal group is accepting storage traffic.
221 */
222 spin_lock_bh(&tpg->tpg_state_lock);
223 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
224 spin_unlock_bh(&tpg->tpg_state_lock);
225 return -1;
226 }
227 spin_unlock_bh(&tpg->tpg_state_lock);
228
229 /*
230 * Here we serialize access across the TIQN+TPG Tuple.
231 */
232 ret = down_interruptible(&tpg->np_login_sem);
233 if (ret != 0)
234 return -1;
235
236 spin_lock_bh(&tpg->tpg_state_lock);
237 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
238 spin_unlock_bh(&tpg->tpg_state_lock);
239 up(&tpg->np_login_sem);
240 return -1;
241 }
242 spin_unlock_bh(&tpg->tpg_state_lock);
243
244 return 0;
245 }
246
247 void iscsit_login_kref_put(struct kref *kref)
248 {
249 struct iscsi_tpg_np *tpg_np = container_of(kref,
250 struct iscsi_tpg_np, tpg_np_kref);
251
252 complete(&tpg_np->tpg_np_comp);
253 }
254
255 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
256 struct iscsi_tpg_np *tpg_np)
257 {
258 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
259
260 up(&tpg->np_login_sem);
261
262 if (tpg_np)
263 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
264
265 if (tiqn)
266 iscsit_put_tiqn_for_login(tiqn);
267
268 return 0;
269 }
270
271 bool iscsit_check_np_match(
272 struct sockaddr_storage *sockaddr,
273 struct iscsi_np *np,
274 int network_transport)
275 {
276 struct sockaddr_in *sock_in, *sock_in_e;
277 struct sockaddr_in6 *sock_in6, *sock_in6_e;
278 bool ip_match = false;
279 u16 port, port_e;
280
281 if (sockaddr->ss_family == AF_INET6) {
282 sock_in6 = (struct sockaddr_in6 *)sockaddr;
283 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
284
285 if (!memcmp(&sock_in6->sin6_addr.in6_u,
286 &sock_in6_e->sin6_addr.in6_u,
287 sizeof(struct in6_addr)))
288 ip_match = true;
289
290 port = ntohs(sock_in6->sin6_port);
291 port_e = ntohs(sock_in6_e->sin6_port);
292 } else {
293 sock_in = (struct sockaddr_in *)sockaddr;
294 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
295
296 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
297 ip_match = true;
298
299 port = ntohs(sock_in->sin_port);
300 port_e = ntohs(sock_in_e->sin_port);
301 }
302
303 if (ip_match && (port_e == port) &&
304 (np->np_network_transport == network_transport))
305 return true;
306
307 return false;
308 }
309
310 /*
311 * Called with mutex np_lock held
312 */
313 static struct iscsi_np *iscsit_get_np(
314 struct sockaddr_storage *sockaddr,
315 int network_transport)
316 {
317 struct iscsi_np *np;
318 bool match;
319
320 list_for_each_entry(np, &g_np_list, np_list) {
321 spin_lock_bh(&np->np_thread_lock);
322 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
323 spin_unlock_bh(&np->np_thread_lock);
324 continue;
325 }
326
327 match = iscsit_check_np_match(sockaddr, np, network_transport);
328 if (match) {
329 /*
330 * Increment the np_exports reference count now to
331 * prevent iscsit_del_np() below from being called
332 * while iscsi_tpg_add_network_portal() is called.
333 */
334 np->np_exports++;
335 spin_unlock_bh(&np->np_thread_lock);
336 return np;
337 }
338 spin_unlock_bh(&np->np_thread_lock);
339 }
340
341 return NULL;
342 }
343
344 struct iscsi_np *iscsit_add_np(
345 struct sockaddr_storage *sockaddr,
346 int network_transport)
347 {
348 struct iscsi_np *np;
349 int ret;
350
351 mutex_lock(&np_lock);
352
353 /*
354 * Locate the existing struct iscsi_np if already active..
355 */
356 np = iscsit_get_np(sockaddr, network_transport);
357 if (np) {
358 mutex_unlock(&np_lock);
359 return np;
360 }
361
362 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
363 if (!np) {
364 pr_err("Unable to allocate memory for struct iscsi_np\n");
365 mutex_unlock(&np_lock);
366 return ERR_PTR(-ENOMEM);
367 }
368
369 np->np_flags |= NPF_IP_NETWORK;
370 np->np_network_transport = network_transport;
371 spin_lock_init(&np->np_thread_lock);
372 init_completion(&np->np_restart_comp);
373 INIT_LIST_HEAD(&np->np_list);
374
375 ret = iscsi_target_setup_login_socket(np, sockaddr);
376 if (ret != 0) {
377 kfree(np);
378 mutex_unlock(&np_lock);
379 return ERR_PTR(ret);
380 }
381
382 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
383 if (IS_ERR(np->np_thread)) {
384 pr_err("Unable to create kthread: iscsi_np\n");
385 ret = PTR_ERR(np->np_thread);
386 kfree(np);
387 mutex_unlock(&np_lock);
388 return ERR_PTR(ret);
389 }
390 /*
391 * Increment the np_exports reference count now to prevent
392 * iscsit_del_np() below from being run while a new call to
393 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
394 * active. We don't need to hold np->np_thread_lock at this
395 * point because iscsi_np has not been added to g_np_list yet.
396 */
397 np->np_exports = 1;
398 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
399
400 list_add_tail(&np->np_list, &g_np_list);
401 mutex_unlock(&np_lock);
402
403 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
404 &np->np_sockaddr, np->np_transport->name);
405
406 return np;
407 }
408
409 int iscsit_reset_np_thread(
410 struct iscsi_np *np,
411 struct iscsi_tpg_np *tpg_np,
412 struct iscsi_portal_group *tpg,
413 bool shutdown)
414 {
415 spin_lock_bh(&np->np_thread_lock);
416 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
417 spin_unlock_bh(&np->np_thread_lock);
418 return 0;
419 }
420 np->np_thread_state = ISCSI_NP_THREAD_RESET;
421
422 if (np->np_thread) {
423 spin_unlock_bh(&np->np_thread_lock);
424 send_sig(SIGINT, np->np_thread, 1);
425 wait_for_completion(&np->np_restart_comp);
426 spin_lock_bh(&np->np_thread_lock);
427 }
428 spin_unlock_bh(&np->np_thread_lock);
429
430 if (tpg_np && shutdown) {
431 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
432
433 wait_for_completion(&tpg_np->tpg_np_comp);
434 }
435
436 return 0;
437 }
438
439 static void iscsit_free_np(struct iscsi_np *np)
440 {
441 if (np->np_socket)
442 sock_release(np->np_socket);
443 }
444
445 int iscsit_del_np(struct iscsi_np *np)
446 {
447 spin_lock_bh(&np->np_thread_lock);
448 np->np_exports--;
449 if (np->np_exports) {
450 np->enabled = true;
451 spin_unlock_bh(&np->np_thread_lock);
452 return 0;
453 }
454 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
455 spin_unlock_bh(&np->np_thread_lock);
456
457 if (np->np_thread) {
458 /*
459 * We need to send the signal to wakeup Linux/Net
460 * which may be sleeping in sock_accept()..
461 */
462 send_sig(SIGINT, np->np_thread, 1);
463 kthread_stop(np->np_thread);
464 np->np_thread = NULL;
465 }
466
467 np->np_transport->iscsit_free_np(np);
468
469 mutex_lock(&np_lock);
470 list_del(&np->np_list);
471 mutex_unlock(&np_lock);
472
473 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
474 &np->np_sockaddr, np->np_transport->name);
475
476 iscsit_put_transport(np->np_transport);
477 kfree(np);
478 return 0;
479 }
480
481 static void iscsit_get_rx_pdu(struct iscsi_conn *);
482
483 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
484 {
485 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
486 return 0;
487 }
488 EXPORT_SYMBOL(iscsit_queue_rsp);
489
490 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
491 {
492 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
493
494 spin_lock_bh(&conn->cmd_lock);
495 if (!list_empty(&cmd->i_conn_node))
496 list_del_init(&cmd->i_conn_node);
497 spin_unlock_bh(&conn->cmd_lock);
498
499 __iscsit_free_cmd(cmd, scsi_cmd, true);
500 }
501 EXPORT_SYMBOL(iscsit_aborted_task);
502
503 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
504 u32, u32, u8 *, u8 *);
505 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
506
507 static int
508 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
509 const void *data_buf, u32 data_buf_len)
510 {
511 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
512 struct kvec *iov;
513 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
514 int ret;
515
516 iov = &cmd->iov_misc[0];
517 iov[niov].iov_base = cmd->pdu;
518 iov[niov++].iov_len = ISCSI_HDR_LEN;
519
520 if (conn->conn_ops->HeaderDigest) {
521 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
522
523 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
524 ISCSI_HDR_LEN, 0, NULL,
525 (u8 *)header_digest);
526
527 iov[0].iov_len += ISCSI_CRC_LEN;
528 tx_size += ISCSI_CRC_LEN;
529 pr_debug("Attaching CRC32C HeaderDigest"
530 " to opcode 0x%x 0x%08x\n",
531 hdr->opcode, *header_digest);
532 }
533
534 if (data_buf_len) {
535 u32 padding = ((-data_buf_len) & 3);
536
537 iov[niov].iov_base = (void *)data_buf;
538 iov[niov++].iov_len = data_buf_len;
539 tx_size += data_buf_len;
540
541 if (padding != 0) {
542 iov[niov].iov_base = &cmd->pad_bytes;
543 iov[niov++].iov_len = padding;
544 tx_size += padding;
545 pr_debug("Attaching %u additional"
546 " padding bytes.\n", padding);
547 }
548
549 if (conn->conn_ops->DataDigest) {
550 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
551 data_buf, data_buf_len,
552 padding,
553 (u8 *)&cmd->pad_bytes,
554 (u8 *)&cmd->data_crc);
555
556 iov[niov].iov_base = &cmd->data_crc;
557 iov[niov++].iov_len = ISCSI_CRC_LEN;
558 tx_size += ISCSI_CRC_LEN;
559 pr_debug("Attached DataDigest for %u"
560 " bytes opcode 0x%x, CRC 0x%08x\n",
561 data_buf_len, hdr->opcode, cmd->data_crc);
562 }
563 }
564
565 cmd->iov_misc_count = niov;
566 cmd->tx_size = tx_size;
567
568 ret = iscsit_send_tx_data(cmd, conn, 1);
569 if (ret < 0) {
570 iscsit_tx_thread_wait_for_tcp(conn);
571 return ret;
572 }
573
574 return 0;
575 }
576
577 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
578 static void iscsit_unmap_iovec(struct iscsi_cmd *);
579 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
580 u32, u32, u32, u8 *);
581 static int
582 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
583 const struct iscsi_datain *datain)
584 {
585 struct kvec *iov;
586 u32 iov_count = 0, tx_size = 0;
587 int ret, iov_ret;
588
589 iov = &cmd->iov_data[0];
590 iov[iov_count].iov_base = cmd->pdu;
591 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
592 tx_size += ISCSI_HDR_LEN;
593
594 if (conn->conn_ops->HeaderDigest) {
595 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
596
597 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
598 ISCSI_HDR_LEN, 0, NULL,
599 (u8 *)header_digest);
600
601 iov[0].iov_len += ISCSI_CRC_LEN;
602 tx_size += ISCSI_CRC_LEN;
603
604 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
605 *header_digest);
606 }
607
608 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
609 datain->offset, datain->length);
610 if (iov_ret < 0)
611 return -1;
612
613 iov_count += iov_ret;
614 tx_size += datain->length;
615
616 cmd->padding = ((-datain->length) & 3);
617 if (cmd->padding) {
618 iov[iov_count].iov_base = cmd->pad_bytes;
619 iov[iov_count++].iov_len = cmd->padding;
620 tx_size += cmd->padding;
621
622 pr_debug("Attaching %u padding bytes\n", cmd->padding);
623 }
624
625 if (conn->conn_ops->DataDigest) {
626 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
627 cmd, datain->offset,
628 datain->length,
629 cmd->padding,
630 cmd->pad_bytes);
631
632 iov[iov_count].iov_base = &cmd->data_crc;
633 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
634 tx_size += ISCSI_CRC_LEN;
635
636 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
637 datain->length + cmd->padding, cmd->data_crc);
638 }
639
640 cmd->iov_data_count = iov_count;
641 cmd->tx_size = tx_size;
642
643 ret = iscsit_fe_sendpage_sg(cmd, conn);
644
645 iscsit_unmap_iovec(cmd);
646
647 if (ret < 0) {
648 iscsit_tx_thread_wait_for_tcp(conn);
649 return ret;
650 }
651
652 return 0;
653 }
654
655 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
656 struct iscsi_datain_req *dr, const void *buf,
657 u32 buf_len)
658 {
659 if (dr)
660 return iscsit_xmit_datain_pdu(conn, cmd, buf);
661 else
662 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
663 }
664
665 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
666 {
667 return TARGET_PROT_NORMAL;
668 }
669
670 static struct iscsit_transport iscsi_target_transport = {
671 .name = "iSCSI/TCP",
672 .transport_type = ISCSI_TCP,
673 .rdma_shutdown = false,
674 .owner = NULL,
675 .iscsit_setup_np = iscsit_setup_np,
676 .iscsit_accept_np = iscsit_accept_np,
677 .iscsit_free_np = iscsit_free_np,
678 .iscsit_get_login_rx = iscsit_get_login_rx,
679 .iscsit_put_login_tx = iscsit_put_login_tx,
680 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
681 .iscsit_immediate_queue = iscsit_immediate_queue,
682 .iscsit_response_queue = iscsit_response_queue,
683 .iscsit_queue_data_in = iscsit_queue_rsp,
684 .iscsit_queue_status = iscsit_queue_rsp,
685 .iscsit_aborted_task = iscsit_aborted_task,
686 .iscsit_xmit_pdu = iscsit_xmit_pdu,
687 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
688 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
689 };
690
691 static int __init iscsi_target_init_module(void)
692 {
693 int ret = 0, size;
694
695 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
696
697 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
698 if (!iscsit_global) {
699 pr_err("Unable to allocate memory for iscsit_global\n");
700 return -1;
701 }
702 spin_lock_init(&iscsit_global->ts_bitmap_lock);
703 mutex_init(&auth_id_lock);
704 spin_lock_init(&sess_idr_lock);
705 idr_init(&tiqn_idr);
706 idr_init(&sess_idr);
707
708 ret = target_register_template(&iscsi_ops);
709 if (ret)
710 goto out;
711
712 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
713 iscsit_global->ts_bitmap = vzalloc(size);
714 if (!iscsit_global->ts_bitmap) {
715 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
716 goto configfs_out;
717 }
718
719 lio_qr_cache = kmem_cache_create("lio_qr_cache",
720 sizeof(struct iscsi_queue_req),
721 __alignof__(struct iscsi_queue_req), 0, NULL);
722 if (!lio_qr_cache) {
723 pr_err("nable to kmem_cache_create() for"
724 " lio_qr_cache\n");
725 goto bitmap_out;
726 }
727
728 lio_dr_cache = kmem_cache_create("lio_dr_cache",
729 sizeof(struct iscsi_datain_req),
730 __alignof__(struct iscsi_datain_req), 0, NULL);
731 if (!lio_dr_cache) {
732 pr_err("Unable to kmem_cache_create() for"
733 " lio_dr_cache\n");
734 goto qr_out;
735 }
736
737 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
738 sizeof(struct iscsi_ooo_cmdsn),
739 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
740 if (!lio_ooo_cache) {
741 pr_err("Unable to kmem_cache_create() for"
742 " lio_ooo_cache\n");
743 goto dr_out;
744 }
745
746 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
747 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
748 0, NULL);
749 if (!lio_r2t_cache) {
750 pr_err("Unable to kmem_cache_create() for"
751 " lio_r2t_cache\n");
752 goto ooo_out;
753 }
754
755 iscsit_register_transport(&iscsi_target_transport);
756
757 if (iscsit_load_discovery_tpg() < 0)
758 goto r2t_out;
759
760 return ret;
761 r2t_out:
762 iscsit_unregister_transport(&iscsi_target_transport);
763 kmem_cache_destroy(lio_r2t_cache);
764 ooo_out:
765 kmem_cache_destroy(lio_ooo_cache);
766 dr_out:
767 kmem_cache_destroy(lio_dr_cache);
768 qr_out:
769 kmem_cache_destroy(lio_qr_cache);
770 bitmap_out:
771 vfree(iscsit_global->ts_bitmap);
772 configfs_out:
773 /* XXX: this probably wants it to be it's own unwind step.. */
774 if (iscsit_global->discovery_tpg)
775 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
776 target_unregister_template(&iscsi_ops);
777 out:
778 kfree(iscsit_global);
779 return -ENOMEM;
780 }
781
782 static void __exit iscsi_target_cleanup_module(void)
783 {
784 iscsit_release_discovery_tpg();
785 iscsit_unregister_transport(&iscsi_target_transport);
786 kmem_cache_destroy(lio_qr_cache);
787 kmem_cache_destroy(lio_dr_cache);
788 kmem_cache_destroy(lio_ooo_cache);
789 kmem_cache_destroy(lio_r2t_cache);
790
791 /*
792 * Shutdown discovery sessions and disable discovery TPG
793 */
794 if (iscsit_global->discovery_tpg)
795 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
796
797 target_unregister_template(&iscsi_ops);
798
799 vfree(iscsit_global->ts_bitmap);
800 kfree(iscsit_global);
801 }
802
803 int iscsit_add_reject(
804 struct iscsi_conn *conn,
805 u8 reason,
806 unsigned char *buf)
807 {
808 struct iscsi_cmd *cmd;
809
810 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
811 if (!cmd)
812 return -1;
813
814 cmd->iscsi_opcode = ISCSI_OP_REJECT;
815 cmd->reject_reason = reason;
816
817 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
818 if (!cmd->buf_ptr) {
819 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
820 iscsit_free_cmd(cmd, false);
821 return -1;
822 }
823
824 spin_lock_bh(&conn->cmd_lock);
825 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
826 spin_unlock_bh(&conn->cmd_lock);
827
828 cmd->i_state = ISTATE_SEND_REJECT;
829 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
830
831 return -1;
832 }
833 EXPORT_SYMBOL(iscsit_add_reject);
834
835 static int iscsit_add_reject_from_cmd(
836 struct iscsi_cmd *cmd,
837 u8 reason,
838 bool add_to_conn,
839 unsigned char *buf)
840 {
841 struct iscsi_conn *conn;
842
843 if (!cmd->conn) {
844 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
845 cmd->init_task_tag);
846 return -1;
847 }
848 conn = cmd->conn;
849
850 cmd->iscsi_opcode = ISCSI_OP_REJECT;
851 cmd->reject_reason = reason;
852
853 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
854 if (!cmd->buf_ptr) {
855 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
856 iscsit_free_cmd(cmd, false);
857 return -1;
858 }
859
860 if (add_to_conn) {
861 spin_lock_bh(&conn->cmd_lock);
862 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
863 spin_unlock_bh(&conn->cmd_lock);
864 }
865
866 cmd->i_state = ISTATE_SEND_REJECT;
867 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
868 /*
869 * Perform the kref_put now if se_cmd has already been setup by
870 * scsit_setup_scsi_cmd()
871 */
872 if (cmd->se_cmd.se_tfo != NULL) {
873 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
874 target_put_sess_cmd(&cmd->se_cmd);
875 }
876 return -1;
877 }
878
879 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
880 unsigned char *buf)
881 {
882 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
883 }
884
885 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
886 {
887 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
888 }
889 EXPORT_SYMBOL(iscsit_reject_cmd);
890
891 /*
892 * Map some portion of the allocated scatterlist to an iovec, suitable for
893 * kernel sockets to copy data in/out.
894 */
895 static int iscsit_map_iovec(
896 struct iscsi_cmd *cmd,
897 struct kvec *iov,
898 u32 data_offset,
899 u32 data_length)
900 {
901 u32 i = 0;
902 struct scatterlist *sg;
903 unsigned int page_off;
904
905 /*
906 * We know each entry in t_data_sg contains a page.
907 */
908 u32 ent = data_offset / PAGE_SIZE;
909
910 if (ent >= cmd->se_cmd.t_data_nents) {
911 pr_err("Initial page entry out-of-bounds\n");
912 return -1;
913 }
914
915 sg = &cmd->se_cmd.t_data_sg[ent];
916 page_off = (data_offset % PAGE_SIZE);
917
918 cmd->first_data_sg = sg;
919 cmd->first_data_sg_off = page_off;
920
921 while (data_length) {
922 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
923
924 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
925 iov[i].iov_len = cur_len;
926
927 data_length -= cur_len;
928 page_off = 0;
929 sg = sg_next(sg);
930 i++;
931 }
932
933 cmd->kmapped_nents = i;
934
935 return i;
936 }
937
938 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
939 {
940 u32 i;
941 struct scatterlist *sg;
942
943 sg = cmd->first_data_sg;
944
945 for (i = 0; i < cmd->kmapped_nents; i++)
946 kunmap(sg_page(&sg[i]));
947 }
948
949 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
950 {
951 LIST_HEAD(ack_list);
952 struct iscsi_cmd *cmd, *cmd_p;
953
954 conn->exp_statsn = exp_statsn;
955
956 if (conn->sess->sess_ops->RDMAExtensions)
957 return;
958
959 spin_lock_bh(&conn->cmd_lock);
960 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
961 spin_lock(&cmd->istate_lock);
962 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
963 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
964 cmd->i_state = ISTATE_REMOVE;
965 spin_unlock(&cmd->istate_lock);
966 list_move_tail(&cmd->i_conn_node, &ack_list);
967 continue;
968 }
969 spin_unlock(&cmd->istate_lock);
970 }
971 spin_unlock_bh(&conn->cmd_lock);
972
973 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
974 list_del_init(&cmd->i_conn_node);
975 iscsit_free_cmd(cmd, false);
976 }
977 }
978
979 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
980 {
981 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
982
983 iov_count += ISCSI_IOV_DATA_BUFFER;
984
985 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
986 if (!cmd->iov_data) {
987 pr_err("Unable to allocate cmd->iov_data\n");
988 return -ENOMEM;
989 }
990
991 cmd->orig_iov_data_count = iov_count;
992 return 0;
993 }
994
995 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
996 unsigned char *buf)
997 {
998 int data_direction, payload_length;
999 struct iscsi_scsi_req *hdr;
1000 int iscsi_task_attr;
1001 int sam_task_attr;
1002
1003 atomic_long_inc(&conn->sess->cmd_pdus);
1004
1005 hdr = (struct iscsi_scsi_req *) buf;
1006 payload_length = ntoh24(hdr->dlength);
1007
1008 /* FIXME; Add checks for AdditionalHeaderSegment */
1009
1010 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1011 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1012 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1013 " not set. Bad iSCSI Initiator.\n");
1014 return iscsit_add_reject_cmd(cmd,
1015 ISCSI_REASON_BOOKMARK_INVALID, buf);
1016 }
1017
1018 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1019 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1020 /*
1021 * From RFC-3720 Section 10.3.1:
1022 *
1023 * "Either or both of R and W MAY be 1 when either the
1024 * Expected Data Transfer Length and/or Bidirectional Read
1025 * Expected Data Transfer Length are 0"
1026 *
1027 * For this case, go ahead and clear the unnecssary bits
1028 * to avoid any confusion with ->data_direction.
1029 */
1030 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1031 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1032
1033 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1034 " set when Expected Data Transfer Length is 0 for"
1035 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1036 }
1037
1038 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1039 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1040 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1041 " MUST be set if Expected Data Transfer Length is not 0."
1042 " Bad iSCSI Initiator\n");
1043 return iscsit_add_reject_cmd(cmd,
1044 ISCSI_REASON_BOOKMARK_INVALID, buf);
1045 }
1046
1047 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1048 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1049 pr_err("Bidirectional operations not supported!\n");
1050 return iscsit_add_reject_cmd(cmd,
1051 ISCSI_REASON_BOOKMARK_INVALID, buf);
1052 }
1053
1054 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1055 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1056 " Scsi Command PDU.\n");
1057 return iscsit_add_reject_cmd(cmd,
1058 ISCSI_REASON_BOOKMARK_INVALID, buf);
1059 }
1060
1061 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1062 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1063 " protocol error.\n", payload_length);
1064 return iscsit_add_reject_cmd(cmd,
1065 ISCSI_REASON_PROTOCOL_ERROR, buf);
1066 }
1067
1068 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1069 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1070 pr_err("Expected Data Transfer Length and Length of"
1071 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1072 " bit is not set protocol error\n");
1073 return iscsit_add_reject_cmd(cmd,
1074 ISCSI_REASON_PROTOCOL_ERROR, buf);
1075 }
1076
1077 if (payload_length > be32_to_cpu(hdr->data_length)) {
1078 pr_err("DataSegmentLength: %u is greater than"
1079 " EDTL: %u, protocol error.\n", payload_length,
1080 hdr->data_length);
1081 return iscsit_add_reject_cmd(cmd,
1082 ISCSI_REASON_PROTOCOL_ERROR, buf);
1083 }
1084
1085 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1086 pr_err("DataSegmentLength: %u is greater than"
1087 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1088 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1089 return iscsit_add_reject_cmd(cmd,
1090 ISCSI_REASON_PROTOCOL_ERROR, buf);
1091 }
1092
1093 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1094 pr_err("DataSegmentLength: %u is greater than"
1095 " FirstBurstLength: %u, protocol error.\n",
1096 payload_length, conn->sess->sess_ops->FirstBurstLength);
1097 return iscsit_add_reject_cmd(cmd,
1098 ISCSI_REASON_BOOKMARK_INVALID, buf);
1099 }
1100
1101 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1102 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1103 DMA_NONE;
1104
1105 cmd->data_direction = data_direction;
1106 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1107 /*
1108 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1109 */
1110 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1111 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1112 sam_task_attr = TCM_SIMPLE_TAG;
1113 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1114 sam_task_attr = TCM_ORDERED_TAG;
1115 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1116 sam_task_attr = TCM_HEAD_TAG;
1117 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1118 sam_task_attr = TCM_ACA_TAG;
1119 else {
1120 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1121 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1122 sam_task_attr = TCM_SIMPLE_TAG;
1123 }
1124
1125 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1126 cmd->i_state = ISTATE_NEW_CMD;
1127 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1128 cmd->immediate_data = (payload_length) ? 1 : 0;
1129 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1130 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1131 if (cmd->unsolicited_data)
1132 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1133
1134 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1135 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1136 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1137 else
1138 cmd->targ_xfer_tag = 0xFFFFFFFF;
1139 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1140 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1141 cmd->first_burst_len = payload_length;
1142
1143 if (!conn->sess->sess_ops->RDMAExtensions &&
1144 cmd->data_direction == DMA_FROM_DEVICE) {
1145 struct iscsi_datain_req *dr;
1146
1147 dr = iscsit_allocate_datain_req();
1148 if (!dr)
1149 return iscsit_add_reject_cmd(cmd,
1150 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1151
1152 iscsit_attach_datain_req(cmd, dr);
1153 }
1154
1155 /*
1156 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1157 */
1158 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1159 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1160 cmd->data_direction, sam_task_attr,
1161 cmd->sense_buffer + 2);
1162
1163 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1164 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1165 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1166 conn->cid);
1167
1168 target_get_sess_cmd(&cmd->se_cmd, true);
1169
1170 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1171 scsilun_to_int(&hdr->lun));
1172 if (cmd->sense_reason)
1173 goto attach_cmd;
1174
1175 /* only used for printks or comparing with ->ref_task_tag */
1176 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1177 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1178 if (cmd->sense_reason) {
1179 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1180 return iscsit_add_reject_cmd(cmd,
1181 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1182 }
1183
1184 goto attach_cmd;
1185 }
1186
1187 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1188 return iscsit_add_reject_cmd(cmd,
1189 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1190 }
1191
1192 attach_cmd:
1193 spin_lock_bh(&conn->cmd_lock);
1194 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1195 spin_unlock_bh(&conn->cmd_lock);
1196 /*
1197 * Check if we need to delay processing because of ALUA
1198 * Active/NonOptimized primary access state..
1199 */
1200 core_alua_check_nonop_delay(&cmd->se_cmd);
1201
1202 return 0;
1203 }
1204 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1205
1206 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1207 {
1208 iscsit_set_dataout_sequence_values(cmd);
1209
1210 spin_lock_bh(&cmd->dataout_timeout_lock);
1211 iscsit_start_dataout_timer(cmd, cmd->conn);
1212 spin_unlock_bh(&cmd->dataout_timeout_lock);
1213 }
1214 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1215
1216 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1217 struct iscsi_scsi_req *hdr)
1218 {
1219 int cmdsn_ret = 0;
1220 /*
1221 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1222 * the Immediate Bit is not set, and no Immediate
1223 * Data is attached.
1224 *
1225 * A PDU/CmdSN carrying Immediate Data can only
1226 * be processed after the DataCRC has passed.
1227 * If the DataCRC fails, the CmdSN MUST NOT
1228 * be acknowledged. (See below)
1229 */
1230 if (!cmd->immediate_data) {
1231 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1232 (unsigned char *)hdr, hdr->cmdsn);
1233 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1234 return -1;
1235 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1236 target_put_sess_cmd(&cmd->se_cmd);
1237 return 0;
1238 }
1239 }
1240
1241 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1242
1243 /*
1244 * If no Immediate Data is attached, it's OK to return now.
1245 */
1246 if (!cmd->immediate_data) {
1247 if (!cmd->sense_reason && cmd->unsolicited_data)
1248 iscsit_set_unsoliticed_dataout(cmd);
1249 if (!cmd->sense_reason)
1250 return 0;
1251
1252 target_put_sess_cmd(&cmd->se_cmd);
1253 return 0;
1254 }
1255
1256 /*
1257 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1258 * execution. These exceptions are processed in CmdSN order using
1259 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1260 */
1261 if (cmd->sense_reason) {
1262 if (cmd->reject_reason)
1263 return 0;
1264
1265 return 1;
1266 }
1267 /*
1268 * Call directly into transport_generic_new_cmd() to perform
1269 * the backend memory allocation.
1270 */
1271 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1272 if (cmd->sense_reason)
1273 return 1;
1274
1275 return 0;
1276 }
1277 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1278
1279 static int
1280 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1281 bool dump_payload)
1282 {
1283 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1284 /*
1285 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1286 */
1287 if (dump_payload)
1288 goto after_immediate_data;
1289
1290 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1291 cmd->first_burst_len);
1292 after_immediate_data:
1293 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1294 /*
1295 * A PDU/CmdSN carrying Immediate Data passed
1296 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1297 * Immediate Bit is not set.
1298 */
1299 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1300 (unsigned char *)hdr, hdr->cmdsn);
1301 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1302 return -1;
1303
1304 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1305 int rc;
1306
1307 rc = iscsit_dump_data_payload(cmd->conn,
1308 cmd->first_burst_len, 1);
1309 target_put_sess_cmd(&cmd->se_cmd);
1310 return rc;
1311 } else if (cmd->unsolicited_data)
1312 iscsit_set_unsoliticed_dataout(cmd);
1313
1314 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1315 /*
1316 * Immediate Data failed DataCRC and ERL>=1,
1317 * silently drop this PDU and let the initiator
1318 * plug the CmdSN gap.
1319 *
1320 * FIXME: Send Unsolicited NOPIN with reserved
1321 * TTT here to help the initiator figure out
1322 * the missing CmdSN, although they should be
1323 * intelligent enough to determine the missing
1324 * CmdSN and issue a retry to plug the sequence.
1325 */
1326 cmd->i_state = ISTATE_REMOVE;
1327 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1328 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1329 return -1;
1330
1331 return 0;
1332 }
1333
1334 static int
1335 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1336 unsigned char *buf)
1337 {
1338 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1339 int rc, immed_data;
1340 bool dump_payload = false;
1341
1342 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1343 if (rc < 0)
1344 return 0;
1345 /*
1346 * Allocation iovecs needed for struct socket operations for
1347 * traditional iSCSI block I/O.
1348 */
1349 if (iscsit_allocate_iovecs(cmd) < 0) {
1350 return iscsit_reject_cmd(cmd,
1351 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1352 }
1353 immed_data = cmd->immediate_data;
1354
1355 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1356 if (rc < 0)
1357 return rc;
1358 else if (rc > 0)
1359 dump_payload = true;
1360
1361 if (!immed_data)
1362 return 0;
1363
1364 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1365 }
1366
1367 static u32 iscsit_do_crypto_hash_sg(
1368 struct ahash_request *hash,
1369 struct iscsi_cmd *cmd,
1370 u32 data_offset,
1371 u32 data_length,
1372 u32 padding,
1373 u8 *pad_bytes)
1374 {
1375 u32 data_crc;
1376 struct scatterlist *sg;
1377 unsigned int page_off;
1378
1379 crypto_ahash_init(hash);
1380
1381 sg = cmd->first_data_sg;
1382 page_off = cmd->first_data_sg_off;
1383
1384 while (data_length) {
1385 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1386
1387 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1388 crypto_ahash_update(hash);
1389
1390 data_length -= cur_len;
1391 page_off = 0;
1392 /* iscsit_map_iovec has already checked for invalid sg pointers */
1393 sg = sg_next(sg);
1394 }
1395
1396 if (padding) {
1397 struct scatterlist pad_sg;
1398
1399 sg_init_one(&pad_sg, pad_bytes, padding);
1400 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1401 padding);
1402 crypto_ahash_finup(hash);
1403 } else {
1404 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1405 crypto_ahash_final(hash);
1406 }
1407
1408 return data_crc;
1409 }
1410
1411 static void iscsit_do_crypto_hash_buf(
1412 struct ahash_request *hash,
1413 const void *buf,
1414 u32 payload_length,
1415 u32 padding,
1416 u8 *pad_bytes,
1417 u8 *data_crc)
1418 {
1419 struct scatterlist sg[2];
1420
1421 sg_init_table(sg, ARRAY_SIZE(sg));
1422 sg_set_buf(sg, buf, payload_length);
1423 sg_set_buf(sg + 1, pad_bytes, padding);
1424
1425 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1426
1427 crypto_ahash_digest(hash);
1428 }
1429
1430 int
1431 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1432 struct iscsi_cmd **out_cmd)
1433 {
1434 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1435 struct iscsi_cmd *cmd = NULL;
1436 struct se_cmd *se_cmd;
1437 u32 payload_length = ntoh24(hdr->dlength);
1438 int rc;
1439
1440 if (!payload_length) {
1441 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1442 return 0;
1443 }
1444
1445 /* iSCSI write */
1446 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1447
1448 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1449 pr_err("DataSegmentLength: %u is greater than"
1450 " MaxXmitDataSegmentLength: %u\n", payload_length,
1451 conn->conn_ops->MaxXmitDataSegmentLength);
1452 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1453 buf);
1454 }
1455
1456 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1457 payload_length);
1458 if (!cmd)
1459 return 0;
1460
1461 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1462 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1463 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1464 payload_length, conn->cid);
1465
1466 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1467 pr_err("Command ITT: 0x%08x received DataOUT after"
1468 " last DataOUT received, dumping payload\n",
1469 cmd->init_task_tag);
1470 return iscsit_dump_data_payload(conn, payload_length, 1);
1471 }
1472
1473 if (cmd->data_direction != DMA_TO_DEVICE) {
1474 pr_err("Command ITT: 0x%08x received DataOUT for a"
1475 " NON-WRITE command.\n", cmd->init_task_tag);
1476 return iscsit_dump_data_payload(conn, payload_length, 1);
1477 }
1478 se_cmd = &cmd->se_cmd;
1479 iscsit_mod_dataout_timer(cmd);
1480
1481 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1482 pr_err("DataOut Offset: %u, Length %u greater than"
1483 " iSCSI Command EDTL %u, protocol error.\n",
1484 hdr->offset, payload_length, cmd->se_cmd.data_length);
1485 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1486 }
1487
1488 if (cmd->unsolicited_data) {
1489 int dump_unsolicited_data = 0;
1490
1491 if (conn->sess->sess_ops->InitialR2T) {
1492 pr_err("Received unexpected unsolicited data"
1493 " while InitialR2T=Yes, protocol error.\n");
1494 transport_send_check_condition_and_sense(&cmd->se_cmd,
1495 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1496 return -1;
1497 }
1498 /*
1499 * Special case for dealing with Unsolicited DataOUT
1500 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1501 * failures;
1502 */
1503
1504 /* Something's amiss if we're not in WRITE_PENDING state... */
1505 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1506 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1507 dump_unsolicited_data = 1;
1508
1509 if (dump_unsolicited_data) {
1510 /*
1511 * Check if a delayed TASK_ABORTED status needs to
1512 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1513 * received with the unsolicited data out.
1514 */
1515 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1516 iscsit_stop_dataout_timer(cmd);
1517
1518 transport_check_aborted_status(se_cmd,
1519 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1520 return iscsit_dump_data_payload(conn, payload_length, 1);
1521 }
1522 } else {
1523 /*
1524 * For the normal solicited data path:
1525 *
1526 * Check for a delayed TASK_ABORTED status and dump any
1527 * incoming data out payload if one exists. Also, when the
1528 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1529 * data out sequence, we decrement outstanding_r2ts. Once
1530 * outstanding_r2ts reaches zero, go ahead and send the delayed
1531 * TASK_ABORTED status.
1532 */
1533 if (se_cmd->transport_state & CMD_T_ABORTED) {
1534 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1535 if (--cmd->outstanding_r2ts < 1) {
1536 iscsit_stop_dataout_timer(cmd);
1537 transport_check_aborted_status(
1538 se_cmd, 1);
1539 }
1540
1541 return iscsit_dump_data_payload(conn, payload_length, 1);
1542 }
1543 }
1544 /*
1545 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1546 * within-command recovery checks before receiving the payload.
1547 */
1548 rc = iscsit_check_pre_dataout(cmd, buf);
1549 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1550 return 0;
1551 else if (rc == DATAOUT_CANNOT_RECOVER)
1552 return -1;
1553
1554 *out_cmd = cmd;
1555 return 0;
1556 }
1557 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1558
1559 static int
1560 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1561 struct iscsi_data *hdr)
1562 {
1563 struct kvec *iov;
1564 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1565 u32 payload_length = ntoh24(hdr->dlength);
1566 int iov_ret, data_crc_failed = 0;
1567
1568 rx_size += payload_length;
1569 iov = &cmd->iov_data[0];
1570
1571 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1572 payload_length);
1573 if (iov_ret < 0)
1574 return -1;
1575
1576 iov_count += iov_ret;
1577
1578 padding = ((-payload_length) & 3);
1579 if (padding != 0) {
1580 iov[iov_count].iov_base = cmd->pad_bytes;
1581 iov[iov_count++].iov_len = padding;
1582 rx_size += padding;
1583 pr_debug("Receiving %u padding bytes.\n", padding);
1584 }
1585
1586 if (conn->conn_ops->DataDigest) {
1587 iov[iov_count].iov_base = &checksum;
1588 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1589 rx_size += ISCSI_CRC_LEN;
1590 }
1591
1592 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1593
1594 iscsit_unmap_iovec(cmd);
1595
1596 if (rx_got != rx_size)
1597 return -1;
1598
1599 if (conn->conn_ops->DataDigest) {
1600 u32 data_crc;
1601
1602 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1603 be32_to_cpu(hdr->offset),
1604 payload_length, padding,
1605 cmd->pad_bytes);
1606
1607 if (checksum != data_crc) {
1608 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1609 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1610 " does not match computed 0x%08x\n",
1611 hdr->itt, hdr->offset, payload_length,
1612 hdr->datasn, checksum, data_crc);
1613 data_crc_failed = 1;
1614 } else {
1615 pr_debug("Got CRC32C DataDigest 0x%08x for"
1616 " %u bytes of Data Out\n", checksum,
1617 payload_length);
1618 }
1619 }
1620
1621 return data_crc_failed;
1622 }
1623
1624 int
1625 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1626 bool data_crc_failed)
1627 {
1628 struct iscsi_conn *conn = cmd->conn;
1629 int rc, ooo_cmdsn;
1630 /*
1631 * Increment post receive data and CRC values or perform
1632 * within-command recovery.
1633 */
1634 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1635 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1636 return 0;
1637 else if (rc == DATAOUT_SEND_R2T) {
1638 iscsit_set_dataout_sequence_values(cmd);
1639 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1640 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1641 /*
1642 * Handle extra special case for out of order
1643 * Unsolicited Data Out.
1644 */
1645 spin_lock_bh(&cmd->istate_lock);
1646 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1647 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1648 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1649 spin_unlock_bh(&cmd->istate_lock);
1650
1651 iscsit_stop_dataout_timer(cmd);
1652 if (ooo_cmdsn)
1653 return 0;
1654 target_execute_cmd(&cmd->se_cmd);
1655 return 0;
1656 } else /* DATAOUT_CANNOT_RECOVER */
1657 return -1;
1658
1659 return 0;
1660 }
1661 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1662
1663 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1664 {
1665 struct iscsi_cmd *cmd = NULL;
1666 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1667 int rc;
1668 bool data_crc_failed = false;
1669
1670 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1671 if (rc < 0)
1672 return 0;
1673 else if (!cmd)
1674 return 0;
1675
1676 rc = iscsit_get_dataout(conn, cmd, hdr);
1677 if (rc < 0)
1678 return rc;
1679 else if (rc > 0)
1680 data_crc_failed = true;
1681
1682 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1683 }
1684
1685 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1686 struct iscsi_nopout *hdr)
1687 {
1688 u32 payload_length = ntoh24(hdr->dlength);
1689
1690 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1691 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1692 if (!cmd)
1693 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1694 (unsigned char *)hdr);
1695
1696 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1697 (unsigned char *)hdr);
1698 }
1699
1700 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1701 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1702 " not set, protocol error.\n");
1703 if (!cmd)
1704 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1705 (unsigned char *)hdr);
1706
1707 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1708 (unsigned char *)hdr);
1709 }
1710
1711 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1712 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1713 " greater than MaxXmitDataSegmentLength: %u, protocol"
1714 " error.\n", payload_length,
1715 conn->conn_ops->MaxXmitDataSegmentLength);
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 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1725 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1726 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1727 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1728 payload_length);
1729 /*
1730 * This is not a response to a Unsolicited NopIN, which means
1731 * it can either be a NOPOUT ping request (with a valid ITT),
1732 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1733 * Either way, make sure we allocate an struct iscsi_cmd, as both
1734 * can contain ping data.
1735 */
1736 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1737 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1738 cmd->i_state = ISTATE_SEND_NOPIN;
1739 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1740 1 : 0);
1741 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1742 cmd->targ_xfer_tag = 0xFFFFFFFF;
1743 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1744 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1745 cmd->data_direction = DMA_NONE;
1746 }
1747
1748 return 0;
1749 }
1750 EXPORT_SYMBOL(iscsit_setup_nop_out);
1751
1752 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1753 struct iscsi_nopout *hdr)
1754 {
1755 struct iscsi_cmd *cmd_p = NULL;
1756 int cmdsn_ret = 0;
1757 /*
1758 * Initiator is expecting a NopIN ping reply..
1759 */
1760 if (hdr->itt != RESERVED_ITT) {
1761 if (!cmd)
1762 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1763 (unsigned char *)hdr);
1764
1765 spin_lock_bh(&conn->cmd_lock);
1766 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1767 spin_unlock_bh(&conn->cmd_lock);
1768
1769 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1770
1771 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1772 iscsit_add_cmd_to_response_queue(cmd, conn,
1773 cmd->i_state);
1774 return 0;
1775 }
1776
1777 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1778 (unsigned char *)hdr, hdr->cmdsn);
1779 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1780 return 0;
1781 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1782 return -1;
1783
1784 return 0;
1785 }
1786 /*
1787 * This was a response to a unsolicited NOPIN ping.
1788 */
1789 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1790 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1791 if (!cmd_p)
1792 return -EINVAL;
1793
1794 iscsit_stop_nopin_response_timer(conn);
1795
1796 cmd_p->i_state = ISTATE_REMOVE;
1797 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1798
1799 iscsit_start_nopin_timer(conn);
1800 return 0;
1801 }
1802 /*
1803 * Otherwise, initiator is not expecting a NOPIN is response.
1804 * Just ignore for now.
1805 */
1806 return 0;
1807 }
1808 EXPORT_SYMBOL(iscsit_process_nop_out);
1809
1810 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1811 unsigned char *buf)
1812 {
1813 unsigned char *ping_data = NULL;
1814 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1815 struct kvec *iov = NULL;
1816 u32 payload_length = ntoh24(hdr->dlength);
1817 int ret;
1818
1819 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1820 if (ret < 0)
1821 return 0;
1822 /*
1823 * Handle NOP-OUT payload for traditional iSCSI sockets
1824 */
1825 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1826 u32 checksum, data_crc, padding = 0;
1827 int niov = 0, rx_got, rx_size = payload_length;
1828
1829 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1830 if (!ping_data) {
1831 pr_err("Unable to allocate memory for"
1832 " NOPOUT ping data.\n");
1833 ret = -1;
1834 goto out;
1835 }
1836
1837 iov = &cmd->iov_misc[0];
1838 iov[niov].iov_base = ping_data;
1839 iov[niov++].iov_len = payload_length;
1840
1841 padding = ((-payload_length) & 3);
1842 if (padding != 0) {
1843 pr_debug("Receiving %u additional bytes"
1844 " for padding.\n", padding);
1845 iov[niov].iov_base = &cmd->pad_bytes;
1846 iov[niov++].iov_len = padding;
1847 rx_size += padding;
1848 }
1849 if (conn->conn_ops->DataDigest) {
1850 iov[niov].iov_base = &checksum;
1851 iov[niov++].iov_len = ISCSI_CRC_LEN;
1852 rx_size += ISCSI_CRC_LEN;
1853 }
1854
1855 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1856 if (rx_got != rx_size) {
1857 ret = -1;
1858 goto out;
1859 }
1860
1861 if (conn->conn_ops->DataDigest) {
1862 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1863 ping_data, payload_length,
1864 padding, cmd->pad_bytes,
1865 (u8 *)&data_crc);
1866
1867 if (checksum != data_crc) {
1868 pr_err("Ping data CRC32C DataDigest"
1869 " 0x%08x does not match computed 0x%08x\n",
1870 checksum, data_crc);
1871 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1872 pr_err("Unable to recover from"
1873 " NOPOUT Ping DataCRC failure while in"
1874 " ERL=0.\n");
1875 ret = -1;
1876 goto out;
1877 } else {
1878 /*
1879 * Silently drop this PDU and let the
1880 * initiator plug the CmdSN gap.
1881 */
1882 pr_debug("Dropping NOPOUT"
1883 " Command CmdSN: 0x%08x due to"
1884 " DataCRC error.\n", hdr->cmdsn);
1885 ret = 0;
1886 goto out;
1887 }
1888 } else {
1889 pr_debug("Got CRC32C DataDigest"
1890 " 0x%08x for %u bytes of ping data.\n",
1891 checksum, payload_length);
1892 }
1893 }
1894
1895 ping_data[payload_length] = '\0';
1896 /*
1897 * Attach ping data to struct iscsi_cmd->buf_ptr.
1898 */
1899 cmd->buf_ptr = ping_data;
1900 cmd->buf_ptr_size = payload_length;
1901
1902 pr_debug("Got %u bytes of NOPOUT ping"
1903 " data.\n", payload_length);
1904 pr_debug("Ping Data: \"%s\"\n", ping_data);
1905 }
1906
1907 return iscsit_process_nop_out(conn, cmd, hdr);
1908 out:
1909 if (cmd)
1910 iscsit_free_cmd(cmd, false);
1911
1912 kfree(ping_data);
1913 return ret;
1914 }
1915
1916 int
1917 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1918 unsigned char *buf)
1919 {
1920 struct se_tmr_req *se_tmr;
1921 struct iscsi_tmr_req *tmr_req;
1922 struct iscsi_tm *hdr;
1923 int out_of_order_cmdsn = 0, ret;
1924 bool sess_ref = false;
1925 u8 function;
1926
1927 hdr = (struct iscsi_tm *) buf;
1928 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1929 function = hdr->flags;
1930
1931 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1932 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1933 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1934 hdr->rtt, hdr->refcmdsn, conn->cid);
1935
1936 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1937 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1938 hdr->rtt != RESERVED_ITT)) {
1939 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1940 hdr->rtt = RESERVED_ITT;
1941 }
1942
1943 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1944 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1945 pr_err("Task Management Request TASK_REASSIGN not"
1946 " issued as immediate command, bad iSCSI Initiator"
1947 "implementation\n");
1948 return iscsit_add_reject_cmd(cmd,
1949 ISCSI_REASON_PROTOCOL_ERROR, buf);
1950 }
1951 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1952 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1953 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1954
1955 cmd->data_direction = DMA_NONE;
1956
1957 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1958 if (!cmd->tmr_req) {
1959 pr_err("Unable to allocate memory for"
1960 " Task Management command!\n");
1961 return iscsit_add_reject_cmd(cmd,
1962 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1963 buf);
1964 }
1965
1966 /*
1967 * TASK_REASSIGN for ERL=2 / connection stays inside of
1968 * LIO-Target $FABRIC_MOD
1969 */
1970 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1971
1972 u8 tcm_function;
1973 int ret;
1974
1975 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1976 conn->sess->se_sess, 0, DMA_NONE,
1977 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1978
1979 target_get_sess_cmd(&cmd->se_cmd, true);
1980 sess_ref = true;
1981
1982 switch (function) {
1983 case ISCSI_TM_FUNC_ABORT_TASK:
1984 tcm_function = TMR_ABORT_TASK;
1985 break;
1986 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1987 tcm_function = TMR_ABORT_TASK_SET;
1988 break;
1989 case ISCSI_TM_FUNC_CLEAR_ACA:
1990 tcm_function = TMR_CLEAR_ACA;
1991 break;
1992 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1993 tcm_function = TMR_CLEAR_TASK_SET;
1994 break;
1995 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1996 tcm_function = TMR_LUN_RESET;
1997 break;
1998 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1999 tcm_function = TMR_TARGET_WARM_RESET;
2000 break;
2001 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2002 tcm_function = TMR_TARGET_COLD_RESET;
2003 break;
2004 default:
2005 pr_err("Unknown iSCSI TMR Function:"
2006 " 0x%02x\n", function);
2007 return iscsit_add_reject_cmd(cmd,
2008 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2009 }
2010
2011 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
2012 tcm_function, GFP_KERNEL);
2013 if (ret < 0)
2014 return iscsit_add_reject_cmd(cmd,
2015 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2016
2017 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2018 }
2019
2020 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2021 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2022 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2023 cmd->init_task_tag = hdr->itt;
2024 cmd->targ_xfer_tag = 0xFFFFFFFF;
2025 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2026 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2027 se_tmr = cmd->se_cmd.se_tmr_req;
2028 tmr_req = cmd->tmr_req;
2029 /*
2030 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2031 */
2032 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2033 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2034 scsilun_to_int(&hdr->lun));
2035 if (ret < 0) {
2036 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2037 goto attach;
2038 }
2039 }
2040
2041 switch (function) {
2042 case ISCSI_TM_FUNC_ABORT_TASK:
2043 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2044 if (se_tmr->response)
2045 goto attach;
2046 break;
2047 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2048 case ISCSI_TM_FUNC_CLEAR_ACA:
2049 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2050 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2051 break;
2052 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2053 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2054 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2055 goto attach;
2056 }
2057 break;
2058 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2059 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2060 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2061 goto attach;
2062 }
2063 break;
2064 case ISCSI_TM_FUNC_TASK_REASSIGN:
2065 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2066 /*
2067 * Perform sanity checks on the ExpDataSN only if the
2068 * TASK_REASSIGN was successful.
2069 */
2070 if (se_tmr->response)
2071 break;
2072
2073 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2074 return iscsit_add_reject_cmd(cmd,
2075 ISCSI_REASON_BOOKMARK_INVALID, buf);
2076 break;
2077 default:
2078 pr_err("Unknown TMR function: 0x%02x, protocol"
2079 " error.\n", function);
2080 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2081 goto attach;
2082 }
2083
2084 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2085 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2086 se_tmr->call_transport = 1;
2087 attach:
2088 spin_lock_bh(&conn->cmd_lock);
2089 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2090 spin_unlock_bh(&conn->cmd_lock);
2091
2092 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2093 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2094 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
2095 out_of_order_cmdsn = 1;
2096 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2097 return 0;
2098 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2099 return -1;
2100 }
2101 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2102
2103 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2104 return 0;
2105 /*
2106 * Found the referenced task, send to transport for processing.
2107 */
2108 if (se_tmr->call_transport)
2109 return transport_generic_handle_tmr(&cmd->se_cmd);
2110
2111 /*
2112 * Could not find the referenced LUN, task, or Task Management
2113 * command not authorized or supported. Change state and
2114 * let the tx_thread send the response.
2115 *
2116 * For connection recovery, this is also the default action for
2117 * TMR TASK_REASSIGN.
2118 */
2119 if (sess_ref) {
2120 pr_debug("Handle TMR, using sess_ref=true check\n");
2121 target_put_sess_cmd(&cmd->se_cmd);
2122 }
2123
2124 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2125 return 0;
2126 }
2127 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2128
2129 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2130 int
2131 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2132 struct iscsi_text *hdr)
2133 {
2134 u32 payload_length = ntoh24(hdr->dlength);
2135
2136 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2137 pr_err("Unable to accept text parameter length: %u"
2138 "greater than MaxXmitDataSegmentLength %u.\n",
2139 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2140 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2141 (unsigned char *)hdr);
2142 }
2143
2144 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2145 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2146 pr_err("Multi sequence text commands currently not supported\n");
2147 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2148 (unsigned char *)hdr);
2149 }
2150
2151 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2152 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2153 hdr->exp_statsn, payload_length);
2154
2155 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2156 cmd->i_state = ISTATE_SEND_TEXTRSP;
2157 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2158 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2159 cmd->targ_xfer_tag = 0xFFFFFFFF;
2160 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2161 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2162 cmd->data_direction = DMA_NONE;
2163 cmd->text_in_ptr = NULL;
2164
2165 return 0;
2166 }
2167 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2168
2169 int
2170 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2171 struct iscsi_text *hdr)
2172 {
2173 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2174 int cmdsn_ret;
2175
2176 if (!text_in) {
2177 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2178 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2179 pr_err("Unable to locate text_in buffer for sendtargets"
2180 " discovery\n");
2181 goto reject;
2182 }
2183 goto empty_sendtargets;
2184 }
2185 if (strncmp("SendTargets", text_in, 11) != 0) {
2186 pr_err("Received Text Data that is not"
2187 " SendTargets, cannot continue.\n");
2188 goto reject;
2189 }
2190 text_ptr = strchr(text_in, '=');
2191 if (!text_ptr) {
2192 pr_err("No \"=\" separator found in Text Data,"
2193 " cannot continue.\n");
2194 goto reject;
2195 }
2196 if (!strncmp("=All", text_ptr, 4)) {
2197 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2198 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2199 !strncmp("=eui.", text_ptr, 5)) {
2200 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2201 } else {
2202 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2203 goto reject;
2204 }
2205
2206 spin_lock_bh(&conn->cmd_lock);
2207 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2208 spin_unlock_bh(&conn->cmd_lock);
2209
2210 empty_sendtargets:
2211 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2212
2213 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2214 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2215 (unsigned char *)hdr, hdr->cmdsn);
2216 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2217 return -1;
2218
2219 return 0;
2220 }
2221
2222 return iscsit_execute_cmd(cmd, 0);
2223
2224 reject:
2225 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2226 (unsigned char *)hdr);
2227 }
2228 EXPORT_SYMBOL(iscsit_process_text_cmd);
2229
2230 static int
2231 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2232 unsigned char *buf)
2233 {
2234 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2235 char *text_in = NULL;
2236 u32 payload_length = ntoh24(hdr->dlength);
2237 int rx_size, rc;
2238
2239 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2240 if (rc < 0)
2241 return 0;
2242
2243 rx_size = payload_length;
2244 if (payload_length) {
2245 u32 checksum = 0, data_crc = 0;
2246 u32 padding = 0, pad_bytes = 0;
2247 int niov = 0, rx_got;
2248 struct kvec iov[3];
2249
2250 text_in = kzalloc(payload_length, GFP_KERNEL);
2251 if (!text_in) {
2252 pr_err("Unable to allocate memory for"
2253 " incoming text parameters\n");
2254 goto reject;
2255 }
2256 cmd->text_in_ptr = text_in;
2257
2258 memset(iov, 0, 3 * sizeof(struct kvec));
2259 iov[niov].iov_base = text_in;
2260 iov[niov++].iov_len = payload_length;
2261
2262 padding = ((-payload_length) & 3);
2263 if (padding != 0) {
2264 iov[niov].iov_base = &pad_bytes;
2265 iov[niov++].iov_len = padding;
2266 rx_size += padding;
2267 pr_debug("Receiving %u additional bytes"
2268 " for padding.\n", padding);
2269 }
2270 if (conn->conn_ops->DataDigest) {
2271 iov[niov].iov_base = &checksum;
2272 iov[niov++].iov_len = ISCSI_CRC_LEN;
2273 rx_size += ISCSI_CRC_LEN;
2274 }
2275
2276 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2277 if (rx_got != rx_size)
2278 goto reject;
2279
2280 if (conn->conn_ops->DataDigest) {
2281 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2282 text_in, payload_length,
2283 padding, (u8 *)&pad_bytes,
2284 (u8 *)&data_crc);
2285
2286 if (checksum != data_crc) {
2287 pr_err("Text data CRC32C DataDigest"
2288 " 0x%08x does not match computed"
2289 " 0x%08x\n", checksum, data_crc);
2290 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2291 pr_err("Unable to recover from"
2292 " Text Data digest failure while in"
2293 " ERL=0.\n");
2294 goto reject;
2295 } else {
2296 /*
2297 * Silently drop this PDU and let the
2298 * initiator plug the CmdSN gap.
2299 */
2300 pr_debug("Dropping Text"
2301 " Command CmdSN: 0x%08x due to"
2302 " DataCRC error.\n", hdr->cmdsn);
2303 kfree(text_in);
2304 return 0;
2305 }
2306 } else {
2307 pr_debug("Got CRC32C DataDigest"
2308 " 0x%08x for %u bytes of text data.\n",
2309 checksum, payload_length);
2310 }
2311 }
2312 text_in[payload_length - 1] = '\0';
2313 pr_debug("Successfully read %d bytes of text"
2314 " data.\n", payload_length);
2315 }
2316
2317 return iscsit_process_text_cmd(conn, cmd, hdr);
2318
2319 reject:
2320 kfree(cmd->text_in_ptr);
2321 cmd->text_in_ptr = NULL;
2322 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2323 }
2324
2325 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2326 {
2327 struct iscsi_conn *conn_p;
2328 struct iscsi_session *sess = conn->sess;
2329
2330 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2331 " for SID: %u.\n", conn->cid, conn->sess->sid);
2332
2333 atomic_set(&sess->session_logout, 1);
2334 atomic_set(&conn->conn_logout_remove, 1);
2335 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2336
2337 iscsit_inc_conn_usage_count(conn);
2338 iscsit_inc_session_usage_count(sess);
2339
2340 spin_lock_bh(&sess->conn_lock);
2341 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2342 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2343 continue;
2344
2345 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2346 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2347 }
2348 spin_unlock_bh(&sess->conn_lock);
2349
2350 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2351
2352 return 0;
2353 }
2354
2355 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2356 {
2357 struct iscsi_conn *l_conn;
2358 struct iscsi_session *sess = conn->sess;
2359
2360 pr_debug("Received logout request CLOSECONNECTION for CID:"
2361 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2362
2363 /*
2364 * A Logout Request with a CLOSECONNECTION reason code for a CID
2365 * can arrive on a connection with a differing CID.
2366 */
2367 if (conn->cid == cmd->logout_cid) {
2368 spin_lock_bh(&conn->state_lock);
2369 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2370 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2371
2372 atomic_set(&conn->conn_logout_remove, 1);
2373 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2374 iscsit_inc_conn_usage_count(conn);
2375
2376 spin_unlock_bh(&conn->state_lock);
2377 } else {
2378 /*
2379 * Handle all different cid CLOSECONNECTION requests in
2380 * iscsit_logout_post_handler_diffcid() as to give enough
2381 * time for any non immediate command's CmdSN to be
2382 * acknowledged on the connection in question.
2383 *
2384 * Here we simply make sure the CID is still around.
2385 */
2386 l_conn = iscsit_get_conn_from_cid(sess,
2387 cmd->logout_cid);
2388 if (!l_conn) {
2389 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2390 iscsit_add_cmd_to_response_queue(cmd, conn,
2391 cmd->i_state);
2392 return 0;
2393 }
2394
2395 iscsit_dec_conn_usage_count(l_conn);
2396 }
2397
2398 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2399
2400 return 0;
2401 }
2402
2403 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2404 {
2405 struct iscsi_session *sess = conn->sess;
2406
2407 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2408 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2409
2410 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2411 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2412 " while ERL!=2.\n");
2413 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2414 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2415 return 0;
2416 }
2417
2418 if (conn->cid == cmd->logout_cid) {
2419 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2420 " with CID: %hu on CID: %hu, implementation error.\n",
2421 cmd->logout_cid, conn->cid);
2422 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2423 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2424 return 0;
2425 }
2426
2427 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2428
2429 return 0;
2430 }
2431
2432 int
2433 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2434 unsigned char *buf)
2435 {
2436 int cmdsn_ret, logout_remove = 0;
2437 u8 reason_code = 0;
2438 struct iscsi_logout *hdr;
2439 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2440
2441 hdr = (struct iscsi_logout *) buf;
2442 reason_code = (hdr->flags & 0x7f);
2443
2444 if (tiqn) {
2445 spin_lock(&tiqn->logout_stats.lock);
2446 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2447 tiqn->logout_stats.normal_logouts++;
2448 else
2449 tiqn->logout_stats.abnormal_logouts++;
2450 spin_unlock(&tiqn->logout_stats.lock);
2451 }
2452
2453 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2454 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2455 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2456 hdr->cid, conn->cid);
2457
2458 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2459 pr_err("Received logout request on connection that"
2460 " is not in logged in state, ignoring request.\n");
2461 iscsit_free_cmd(cmd, false);
2462 return 0;
2463 }
2464
2465 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2466 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2467 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2468 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2469 cmd->targ_xfer_tag = 0xFFFFFFFF;
2470 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2471 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2472 cmd->logout_cid = be16_to_cpu(hdr->cid);
2473 cmd->logout_reason = reason_code;
2474 cmd->data_direction = DMA_NONE;
2475
2476 /*
2477 * We need to sleep in these cases (by returning 1) until the Logout
2478 * Response gets sent in the tx thread.
2479 */
2480 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2481 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2482 be16_to_cpu(hdr->cid) == conn->cid))
2483 logout_remove = 1;
2484
2485 spin_lock_bh(&conn->cmd_lock);
2486 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2487 spin_unlock_bh(&conn->cmd_lock);
2488
2489 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2490 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2491
2492 /*
2493 * Immediate commands are executed, well, immediately.
2494 * Non-Immediate Logout Commands are executed in CmdSN order.
2495 */
2496 if (cmd->immediate_cmd) {
2497 int ret = iscsit_execute_cmd(cmd, 0);
2498
2499 if (ret < 0)
2500 return ret;
2501 } else {
2502 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2503 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2504 logout_remove = 0;
2505 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2506 return -1;
2507 }
2508
2509 return logout_remove;
2510 }
2511 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2512
2513 int iscsit_handle_snack(
2514 struct iscsi_conn *conn,
2515 unsigned char *buf)
2516 {
2517 struct iscsi_snack *hdr;
2518
2519 hdr = (struct iscsi_snack *) buf;
2520 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2521
2522 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2523 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2524 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2525 hdr->begrun, hdr->runlength, conn->cid);
2526
2527 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2528 pr_err("Initiator sent SNACK request while in"
2529 " ErrorRecoveryLevel=0.\n");
2530 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2531 buf);
2532 }
2533 /*
2534 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2535 * call from inside iscsi_send_recovery_datain_or_r2t().
2536 */
2537 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2538 case 0:
2539 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2540 hdr->itt,
2541 be32_to_cpu(hdr->ttt),
2542 be32_to_cpu(hdr->begrun),
2543 be32_to_cpu(hdr->runlength));
2544 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2545 return iscsit_handle_status_snack(conn, hdr->itt,
2546 be32_to_cpu(hdr->ttt),
2547 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2548 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2549 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2550 be32_to_cpu(hdr->begrun),
2551 be32_to_cpu(hdr->runlength));
2552 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2553 /* FIXME: Support R-Data SNACK */
2554 pr_err("R-Data SNACK Not Supported.\n");
2555 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2556 buf);
2557 default:
2558 pr_err("Unknown SNACK type 0x%02x, protocol"
2559 " error.\n", hdr->flags & 0x0f);
2560 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2561 buf);
2562 }
2563
2564 return 0;
2565 }
2566 EXPORT_SYMBOL(iscsit_handle_snack);
2567
2568 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2569 {
2570 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2571 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2572 wait_for_completion_interruptible_timeout(
2573 &conn->rx_half_close_comp,
2574 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2575 }
2576 }
2577
2578 static int iscsit_handle_immediate_data(
2579 struct iscsi_cmd *cmd,
2580 struct iscsi_scsi_req *hdr,
2581 u32 length)
2582 {
2583 int iov_ret, rx_got = 0, rx_size = 0;
2584 u32 checksum, iov_count = 0, padding = 0;
2585 struct iscsi_conn *conn = cmd->conn;
2586 struct kvec *iov;
2587
2588 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2589 if (iov_ret < 0)
2590 return IMMEDIATE_DATA_CANNOT_RECOVER;
2591
2592 rx_size = length;
2593 iov_count = iov_ret;
2594 iov = &cmd->iov_data[0];
2595
2596 padding = ((-length) & 3);
2597 if (padding != 0) {
2598 iov[iov_count].iov_base = cmd->pad_bytes;
2599 iov[iov_count++].iov_len = padding;
2600 rx_size += padding;
2601 }
2602
2603 if (conn->conn_ops->DataDigest) {
2604 iov[iov_count].iov_base = &checksum;
2605 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2606 rx_size += ISCSI_CRC_LEN;
2607 }
2608
2609 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2610
2611 iscsit_unmap_iovec(cmd);
2612
2613 if (rx_got != rx_size) {
2614 iscsit_rx_thread_wait_for_tcp(conn);
2615 return IMMEDIATE_DATA_CANNOT_RECOVER;
2616 }
2617
2618 if (conn->conn_ops->DataDigest) {
2619 u32 data_crc;
2620
2621 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2622 cmd->write_data_done, length, padding,
2623 cmd->pad_bytes);
2624
2625 if (checksum != data_crc) {
2626 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2627 " does not match computed 0x%08x\n", checksum,
2628 data_crc);
2629
2630 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2631 pr_err("Unable to recover from"
2632 " Immediate Data digest failure while"
2633 " in ERL=0.\n");
2634 iscsit_reject_cmd(cmd,
2635 ISCSI_REASON_DATA_DIGEST_ERROR,
2636 (unsigned char *)hdr);
2637 return IMMEDIATE_DATA_CANNOT_RECOVER;
2638 } else {
2639 iscsit_reject_cmd(cmd,
2640 ISCSI_REASON_DATA_DIGEST_ERROR,
2641 (unsigned char *)hdr);
2642 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2643 }
2644 } else {
2645 pr_debug("Got CRC32C DataDigest 0x%08x for"
2646 " %u bytes of Immediate Data\n", checksum,
2647 length);
2648 }
2649 }
2650
2651 cmd->write_data_done += length;
2652
2653 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2654 spin_lock_bh(&cmd->istate_lock);
2655 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2656 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2657 spin_unlock_bh(&cmd->istate_lock);
2658 }
2659
2660 return IMMEDIATE_DATA_NORMAL_OPERATION;
2661 }
2662
2663 /*
2664 * Called with sess->conn_lock held.
2665 */
2666 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2667 with active network interface */
2668 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2669 {
2670 struct iscsi_cmd *cmd;
2671 struct iscsi_conn *conn_p;
2672 bool found = false;
2673
2674 /*
2675 * Only send a Asynchronous Message on connections whos network
2676 * interface is still functional.
2677 */
2678 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2679 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2680 iscsit_inc_conn_usage_count(conn_p);
2681 found = true;
2682 break;
2683 }
2684 }
2685
2686 if (!found)
2687 return;
2688
2689 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2690 if (!cmd) {
2691 iscsit_dec_conn_usage_count(conn_p);
2692 return;
2693 }
2694
2695 cmd->logout_cid = conn->cid;
2696 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2697 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2698
2699 spin_lock_bh(&conn_p->cmd_lock);
2700 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2701 spin_unlock_bh(&conn_p->cmd_lock);
2702
2703 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2704 iscsit_dec_conn_usage_count(conn_p);
2705 }
2706
2707 static int iscsit_send_conn_drop_async_message(
2708 struct iscsi_cmd *cmd,
2709 struct iscsi_conn *conn)
2710 {
2711 struct iscsi_async *hdr;
2712
2713 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2714
2715 hdr = (struct iscsi_async *) cmd->pdu;
2716 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2717 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2718 cmd->init_task_tag = RESERVED_ITT;
2719 cmd->targ_xfer_tag = 0xFFFFFFFF;
2720 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2721 cmd->stat_sn = conn->stat_sn++;
2722 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2723 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2724 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2725 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2726 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2727 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2728 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2729
2730 pr_debug("Sending Connection Dropped Async Message StatSN:"
2731 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2732 cmd->logout_cid, conn->cid);
2733
2734 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2735 }
2736
2737 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2738 {
2739 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2740 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2741 wait_for_completion_interruptible_timeout(
2742 &conn->tx_half_close_comp,
2743 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2744 }
2745 }
2746
2747 void
2748 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2749 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2750 bool set_statsn)
2751 {
2752 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2753 hdr->flags = datain->flags;
2754 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2755 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2756 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2757 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2758 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2759 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2760 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2761 }
2762 }
2763 hton24(hdr->dlength, datain->length);
2764 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2765 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2766 (struct scsi_lun *)&hdr->lun);
2767 else
2768 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2769
2770 hdr->itt = cmd->init_task_tag;
2771
2772 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2773 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2774 else
2775 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2776 if (set_statsn)
2777 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2778 else
2779 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2780
2781 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2782 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2783 hdr->datasn = cpu_to_be32(datain->data_sn);
2784 hdr->offset = cpu_to_be32(datain->offset);
2785
2786 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2787 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2788 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2789 ntohl(hdr->offset), datain->length, conn->cid);
2790 }
2791 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2792
2793 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2794 {
2795 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2796 struct iscsi_datain datain;
2797 struct iscsi_datain_req *dr;
2798 int eodr = 0, ret;
2799 bool set_statsn = false;
2800
2801 memset(&datain, 0, sizeof(struct iscsi_datain));
2802 dr = iscsit_get_datain_values(cmd, &datain);
2803 if (!dr) {
2804 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2805 cmd->init_task_tag);
2806 return -1;
2807 }
2808 /*
2809 * Be paranoid and double check the logic for now.
2810 */
2811 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2812 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2813 " datain.length: %u exceeds cmd->data_length: %u\n",
2814 cmd->init_task_tag, datain.offset, datain.length,
2815 cmd->se_cmd.data_length);
2816 return -1;
2817 }
2818
2819 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2820 /*
2821 * Special case for successfully execution w/ both DATAIN
2822 * and Sense Data.
2823 */
2824 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2825 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2826 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2827 else {
2828 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2829 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2830 iscsit_increment_maxcmdsn(cmd, conn->sess);
2831 cmd->stat_sn = conn->stat_sn++;
2832 set_statsn = true;
2833 } else if (dr->dr_complete ==
2834 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2835 set_statsn = true;
2836 }
2837
2838 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2839
2840 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2841 if (ret < 0)
2842 return ret;
2843
2844 if (dr->dr_complete) {
2845 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2846 2 : 1;
2847 iscsit_free_datain_req(cmd, dr);
2848 }
2849
2850 return eodr;
2851 }
2852
2853 int
2854 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2855 struct iscsi_logout_rsp *hdr)
2856 {
2857 struct iscsi_conn *logout_conn = NULL;
2858 struct iscsi_conn_recovery *cr = NULL;
2859 struct iscsi_session *sess = conn->sess;
2860 /*
2861 * The actual shutting down of Sessions and/or Connections
2862 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2863 * is done in scsi_logout_post_handler().
2864 */
2865 switch (cmd->logout_reason) {
2866 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2867 pr_debug("iSCSI session logout successful, setting"
2868 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2869 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2870 break;
2871 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2872 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2873 break;
2874 /*
2875 * For CLOSECONNECTION logout requests carrying
2876 * a matching logout CID -> local CID, the reference
2877 * for the local CID will have been incremented in
2878 * iscsi_logout_closeconnection().
2879 *
2880 * For CLOSECONNECTION logout requests carrying
2881 * a different CID than the connection it arrived
2882 * on, the connection responding to cmd->logout_cid
2883 * is stopped in iscsit_logout_post_handler_diffcid().
2884 */
2885
2886 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2887 " successful.\n", cmd->logout_cid, conn->cid);
2888 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2889 break;
2890 case ISCSI_LOGOUT_REASON_RECOVERY:
2891 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2892 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2893 break;
2894 /*
2895 * If the connection is still active from our point of view
2896 * force connection recovery to occur.
2897 */
2898 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2899 cmd->logout_cid);
2900 if (logout_conn) {
2901 iscsit_connection_reinstatement_rcfr(logout_conn);
2902 iscsit_dec_conn_usage_count(logout_conn);
2903 }
2904
2905 cr = iscsit_get_inactive_connection_recovery_entry(
2906 conn->sess, cmd->logout_cid);
2907 if (!cr) {
2908 pr_err("Unable to locate CID: %hu for"
2909 " REMOVECONNFORRECOVERY Logout Request.\n",
2910 cmd->logout_cid);
2911 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2912 break;
2913 }
2914
2915 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2916
2917 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2918 " for recovery for CID: %hu on CID: %hu successful.\n",
2919 cmd->logout_cid, conn->cid);
2920 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2921 break;
2922 default:
2923 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2924 cmd->logout_reason);
2925 return -1;
2926 }
2927
2928 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2929 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2930 hdr->response = cmd->logout_response;
2931 hdr->itt = cmd->init_task_tag;
2932 cmd->stat_sn = conn->stat_sn++;
2933 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2934
2935 iscsit_increment_maxcmdsn(cmd, conn->sess);
2936 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2937 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2938
2939 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2940 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2941 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2942 cmd->logout_cid, conn->cid);
2943
2944 return 0;
2945 }
2946 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2947
2948 static int
2949 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2950 {
2951 int rc;
2952
2953 rc = iscsit_build_logout_rsp(cmd, conn,
2954 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2955 if (rc < 0)
2956 return rc;
2957
2958 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2959 }
2960
2961 void
2962 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2963 struct iscsi_nopin *hdr, bool nopout_response)
2964 {
2965 hdr->opcode = ISCSI_OP_NOOP_IN;
2966 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2967 hton24(hdr->dlength, cmd->buf_ptr_size);
2968 if (nopout_response)
2969 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2970 hdr->itt = cmd->init_task_tag;
2971 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2972 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2973 conn->stat_sn;
2974 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2975
2976 if (nopout_response)
2977 iscsit_increment_maxcmdsn(cmd, conn->sess);
2978
2979 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2980 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2981
2982 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2983 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2984 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2985 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2986 }
2987 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2988
2989 /*
2990 * Unsolicited NOPIN, either requesting a response or not.
2991 */
2992 static int iscsit_send_unsolicited_nopin(
2993 struct iscsi_cmd *cmd,
2994 struct iscsi_conn *conn,
2995 int want_response)
2996 {
2997 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2998 int ret;
2999
3000 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3001
3002 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3003 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3004
3005 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3006 if (ret < 0)
3007 return ret;
3008
3009 spin_lock_bh(&cmd->istate_lock);
3010 cmd->i_state = want_response ?
3011 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3012 spin_unlock_bh(&cmd->istate_lock);
3013
3014 return 0;
3015 }
3016
3017 static int
3018 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3019 {
3020 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3021
3022 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3023
3024 /*
3025 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3026 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3027 */
3028 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3029
3030 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3031 cmd->buf_ptr,
3032 cmd->buf_ptr_size);
3033 }
3034
3035 static int iscsit_send_r2t(
3036 struct iscsi_cmd *cmd,
3037 struct iscsi_conn *conn)
3038 {
3039 struct iscsi_r2t *r2t;
3040 struct iscsi_r2t_rsp *hdr;
3041 int ret;
3042
3043 r2t = iscsit_get_r2t_from_list(cmd);
3044 if (!r2t)
3045 return -1;
3046
3047 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3048 memset(hdr, 0, ISCSI_HDR_LEN);
3049 hdr->opcode = ISCSI_OP_R2T;
3050 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3051 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3052 (struct scsi_lun *)&hdr->lun);
3053 hdr->itt = cmd->init_task_tag;
3054 if (conn->conn_transport->iscsit_get_r2t_ttt)
3055 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3056 else
3057 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3058 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3059 hdr->statsn = cpu_to_be32(conn->stat_sn);
3060 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3061 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3062 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3063 hdr->data_offset = cpu_to_be32(r2t->offset);
3064 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3065
3066 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3067 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3068 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3069 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3070 r2t->offset, r2t->xfer_len, conn->cid);
3071
3072 spin_lock_bh(&cmd->r2t_lock);
3073 r2t->sent_r2t = 1;
3074 spin_unlock_bh(&cmd->r2t_lock);
3075
3076 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3077 if (ret < 0) {
3078 return ret;
3079 }
3080
3081 spin_lock_bh(&cmd->dataout_timeout_lock);
3082 iscsit_start_dataout_timer(cmd, conn);
3083 spin_unlock_bh(&cmd->dataout_timeout_lock);
3084
3085 return 0;
3086 }
3087
3088 /*
3089 * @recovery: If called from iscsi_task_reassign_complete_write() for
3090 * connection recovery.
3091 */
3092 int iscsit_build_r2ts_for_cmd(
3093 struct iscsi_conn *conn,
3094 struct iscsi_cmd *cmd,
3095 bool recovery)
3096 {
3097 int first_r2t = 1;
3098 u32 offset = 0, xfer_len = 0;
3099
3100 spin_lock_bh(&cmd->r2t_lock);
3101 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3102 spin_unlock_bh(&cmd->r2t_lock);
3103 return 0;
3104 }
3105
3106 if (conn->sess->sess_ops->DataSequenceInOrder &&
3107 !recovery)
3108 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3109
3110 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3111 if (conn->sess->sess_ops->DataSequenceInOrder) {
3112 offset = cmd->r2t_offset;
3113
3114 if (first_r2t && recovery) {
3115 int new_data_end = offset +
3116 conn->sess->sess_ops->MaxBurstLength -
3117 cmd->next_burst_len;
3118
3119 if (new_data_end > cmd->se_cmd.data_length)
3120 xfer_len = cmd->se_cmd.data_length - offset;
3121 else
3122 xfer_len =
3123 conn->sess->sess_ops->MaxBurstLength -
3124 cmd->next_burst_len;
3125 } else {
3126 int new_data_end = offset +
3127 conn->sess->sess_ops->MaxBurstLength;
3128
3129 if (new_data_end > cmd->se_cmd.data_length)
3130 xfer_len = cmd->se_cmd.data_length - offset;
3131 else
3132 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3133 }
3134 cmd->r2t_offset += xfer_len;
3135
3136 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3137 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3138 } else {
3139 struct iscsi_seq *seq;
3140
3141 seq = iscsit_get_seq_holder_for_r2t(cmd);
3142 if (!seq) {
3143 spin_unlock_bh(&cmd->r2t_lock);
3144 return -1;
3145 }
3146
3147 offset = seq->offset;
3148 xfer_len = seq->xfer_len;
3149
3150 if (cmd->seq_send_order == cmd->seq_count)
3151 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3152 }
3153 cmd->outstanding_r2ts++;
3154 first_r2t = 0;
3155
3156 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3157 spin_unlock_bh(&cmd->r2t_lock);
3158 return -1;
3159 }
3160
3161 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3162 break;
3163 }
3164 spin_unlock_bh(&cmd->r2t_lock);
3165
3166 return 0;
3167 }
3168 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3169
3170 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3171 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3172 {
3173 if (inc_stat_sn)
3174 cmd->stat_sn = conn->stat_sn++;
3175
3176 atomic_long_inc(&conn->sess->rsp_pdus);
3177
3178 memset(hdr, 0, ISCSI_HDR_LEN);
3179 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3180 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3181 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3182 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3183 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3184 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3185 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3186 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3187 }
3188 hdr->response = cmd->iscsi_response;
3189 hdr->cmd_status = cmd->se_cmd.scsi_status;
3190 hdr->itt = cmd->init_task_tag;
3191 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3192
3193 iscsit_increment_maxcmdsn(cmd, conn->sess);
3194 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3195 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3196
3197 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3198 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3199 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3200 cmd->se_cmd.scsi_status, conn->cid);
3201 }
3202 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3203
3204 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3205 {
3206 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3207 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3208 void *data_buf = NULL;
3209 u32 padding = 0, data_buf_len = 0;
3210
3211 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3212
3213 /*
3214 * Attach SENSE DATA payload to iSCSI Response PDU
3215 */
3216 if (cmd->se_cmd.sense_buffer &&
3217 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3218 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3219 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3220 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3221
3222 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3223 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3224 data_buf = cmd->sense_buffer;
3225 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3226
3227 if (padding) {
3228 memset(cmd->sense_buffer +
3229 cmd->se_cmd.scsi_sense_length, 0, padding);
3230 pr_debug("Adding %u bytes of padding to"
3231 " SENSE.\n", padding);
3232 }
3233
3234 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3235 " Response PDU\n",
3236 cmd->se_cmd.scsi_sense_length);
3237 }
3238
3239 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3240 data_buf_len);
3241 }
3242
3243 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3244 {
3245 switch (se_tmr->response) {
3246 case TMR_FUNCTION_COMPLETE:
3247 return ISCSI_TMF_RSP_COMPLETE;
3248 case TMR_TASK_DOES_NOT_EXIST:
3249 return ISCSI_TMF_RSP_NO_TASK;
3250 case TMR_LUN_DOES_NOT_EXIST:
3251 return ISCSI_TMF_RSP_NO_LUN;
3252 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3253 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3254 case TMR_FUNCTION_REJECTED:
3255 default:
3256 return ISCSI_TMF_RSP_REJECTED;
3257 }
3258 }
3259
3260 void
3261 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3262 struct iscsi_tm_rsp *hdr)
3263 {
3264 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3265
3266 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3267 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3268 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3269 hdr->itt = cmd->init_task_tag;
3270 cmd->stat_sn = conn->stat_sn++;
3271 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3272
3273 iscsit_increment_maxcmdsn(cmd, conn->sess);
3274 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3275 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3276
3277 pr_debug("Built Task Management Response ITT: 0x%08x,"
3278 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3279 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3280 }
3281 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3282
3283 static int
3284 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3285 {
3286 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3287
3288 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3289
3290 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3291 }
3292
3293 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3294 {
3295 bool ret = false;
3296
3297 if (np->np_sockaddr.ss_family == AF_INET6) {
3298 const struct sockaddr_in6 sin6 = {
3299 .sin6_addr = IN6ADDR_ANY_INIT };
3300 struct sockaddr_in6 *sock_in6 =
3301 (struct sockaddr_in6 *)&np->np_sockaddr;
3302
3303 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3304 sin6.sin6_addr.s6_addr, 16))
3305 ret = true;
3306 } else {
3307 struct sockaddr_in * sock_in =
3308 (struct sockaddr_in *)&np->np_sockaddr;
3309
3310 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3311 ret = true;
3312 }
3313
3314 return ret;
3315 }
3316
3317 #define SENDTARGETS_BUF_LIMIT 32768U
3318
3319 static int
3320 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3321 enum iscsit_transport_type network_transport,
3322 int skip_bytes, bool *completed)
3323 {
3324 char *payload = NULL;
3325 struct iscsi_conn *conn = cmd->conn;
3326 struct iscsi_portal_group *tpg;
3327 struct iscsi_tiqn *tiqn;
3328 struct iscsi_tpg_np *tpg_np;
3329 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3330 int target_name_printed;
3331 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3332 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3333 bool active;
3334
3335 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3336 SENDTARGETS_BUF_LIMIT);
3337
3338 payload = kzalloc(buffer_len, GFP_KERNEL);
3339 if (!payload) {
3340 pr_err("Unable to allocate memory for sendtargets"
3341 " response.\n");
3342 return -ENOMEM;
3343 }
3344 /*
3345 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3346 * explicit case..
3347 */
3348 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3349 text_ptr = strchr(text_in, '=');
3350 if (!text_ptr) {
3351 pr_err("Unable to locate '=' string in text_in:"
3352 " %s\n", text_in);
3353 kfree(payload);
3354 return -EINVAL;
3355 }
3356 /*
3357 * Skip over '=' character..
3358 */
3359 text_ptr += 1;
3360 }
3361
3362 spin_lock(&tiqn_lock);
3363 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3364 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3365 strcmp(tiqn->tiqn, text_ptr)) {
3366 continue;
3367 }
3368
3369 target_name_printed = 0;
3370
3371 spin_lock(&tiqn->tiqn_tpg_lock);
3372 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3373
3374 /* If demo_mode_discovery=0 and generate_node_acls=0
3375 * (demo mode dislabed) do not return
3376 * TargetName+TargetAddress unless a NodeACL exists.
3377 */
3378
3379 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3380 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3381 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3382 cmd->conn->sess->sess_ops->InitiatorName))) {
3383 continue;
3384 }
3385
3386 spin_lock(&tpg->tpg_state_lock);
3387 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3388 spin_unlock(&tpg->tpg_state_lock);
3389
3390 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3391 continue;
3392
3393 spin_lock(&tpg->tpg_np_lock);
3394 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3395 tpg_np_list) {
3396 struct iscsi_np *np = tpg_np->tpg_np;
3397 bool inaddr_any = iscsit_check_inaddr_any(np);
3398 struct sockaddr_storage *sockaddr;
3399
3400 if (np->np_network_transport != network_transport)
3401 continue;
3402
3403 if (!target_name_printed) {
3404 len = sprintf(buf, "TargetName=%s",
3405 tiqn->tiqn);
3406 len += 1;
3407
3408 if ((len + payload_len) > buffer_len) {
3409 spin_unlock(&tpg->tpg_np_lock);
3410 spin_unlock(&tiqn->tiqn_tpg_lock);
3411 end_of_buf = 1;
3412 goto eob;
3413 }
3414
3415 if (skip_bytes && len <= skip_bytes) {
3416 skip_bytes -= len;
3417 } else {
3418 memcpy(payload + payload_len, buf, len);
3419 payload_len += len;
3420 target_name_printed = 1;
3421 if (len > skip_bytes)
3422 skip_bytes = 0;
3423 }
3424 }
3425
3426 if (inaddr_any)
3427 sockaddr = &conn->local_sockaddr;
3428 else
3429 sockaddr = &np->np_sockaddr;
3430
3431 len = sprintf(buf, "TargetAddress="
3432 "%pISpc,%hu",
3433 sockaddr,
3434 tpg->tpgt);
3435 len += 1;
3436
3437 if ((len + payload_len) > buffer_len) {
3438 spin_unlock(&tpg->tpg_np_lock);
3439 spin_unlock(&tiqn->tiqn_tpg_lock);
3440 end_of_buf = 1;
3441 goto eob;
3442 }
3443
3444 if (skip_bytes && len <= skip_bytes) {
3445 skip_bytes -= len;
3446 } else {
3447 memcpy(payload + payload_len, buf, len);
3448 payload_len += len;
3449 if (len > skip_bytes)
3450 skip_bytes = 0;
3451 }
3452 }
3453 spin_unlock(&tpg->tpg_np_lock);
3454 }
3455 spin_unlock(&tiqn->tiqn_tpg_lock);
3456 eob:
3457 if (end_of_buf) {
3458 *completed = false;
3459 break;
3460 }
3461
3462 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3463 break;
3464 }
3465 spin_unlock(&tiqn_lock);
3466
3467 cmd->buf_ptr = payload;
3468
3469 return payload_len;
3470 }
3471
3472 int
3473 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3474 struct iscsi_text_rsp *hdr,
3475 enum iscsit_transport_type network_transport)
3476 {
3477 int text_length, padding;
3478 bool completed = true;
3479
3480 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3481 cmd->read_data_done,
3482 &completed);
3483 if (text_length < 0)
3484 return text_length;
3485
3486 if (completed) {
3487 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3488 } else {
3489 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3490 cmd->read_data_done += text_length;
3491 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3492 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3493 }
3494 hdr->opcode = ISCSI_OP_TEXT_RSP;
3495 padding = ((-text_length) & 3);
3496 hton24(hdr->dlength, text_length);
3497 hdr->itt = cmd->init_task_tag;
3498 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3499 cmd->stat_sn = conn->stat_sn++;
3500 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3501
3502 iscsit_increment_maxcmdsn(cmd, conn->sess);
3503 /*
3504 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3505 * correctly increment MaxCmdSN for each response answering a
3506 * non immediate text request with a valid CmdSN.
3507 */
3508 cmd->maxcmdsn_inc = 0;
3509 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3510 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3511
3512 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3513 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3514 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3515 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3516 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3517
3518 return text_length + padding;
3519 }
3520 EXPORT_SYMBOL(iscsit_build_text_rsp);
3521
3522 static int iscsit_send_text_rsp(
3523 struct iscsi_cmd *cmd,
3524 struct iscsi_conn *conn)
3525 {
3526 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3527 int text_length;
3528
3529 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3530 conn->conn_transport->transport_type);
3531 if (text_length < 0)
3532 return text_length;
3533
3534 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3535 cmd->buf_ptr,
3536 text_length);
3537 }
3538
3539 void
3540 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3541 struct iscsi_reject *hdr)
3542 {
3543 hdr->opcode = ISCSI_OP_REJECT;
3544 hdr->reason = cmd->reject_reason;
3545 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3546 hton24(hdr->dlength, ISCSI_HDR_LEN);
3547 hdr->ffffffff = cpu_to_be32(0xffffffff);
3548 cmd->stat_sn = conn->stat_sn++;
3549 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3550 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3551 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3552
3553 }
3554 EXPORT_SYMBOL(iscsit_build_reject);
3555
3556 static int iscsit_send_reject(
3557 struct iscsi_cmd *cmd,
3558 struct iscsi_conn *conn)
3559 {
3560 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3561
3562 iscsit_build_reject(cmd, conn, hdr);
3563
3564 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3565 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3566
3567 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3568 cmd->buf_ptr,
3569 ISCSI_HDR_LEN);
3570 }
3571
3572 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3573 {
3574 int ord, cpu;
3575 /*
3576 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3577 * within iscsit_start_kthreads()
3578 *
3579 * Here we use bitmap_id to determine which CPU that this
3580 * iSCSI connection's RX/TX threads will be scheduled to
3581 * execute upon.
3582 */
3583 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3584 for_each_online_cpu(cpu) {
3585 if (ord-- == 0) {
3586 cpumask_set_cpu(cpu, conn->conn_cpumask);
3587 return;
3588 }
3589 }
3590 /*
3591 * This should never be reached..
3592 */
3593 dump_stack();
3594 cpumask_setall(conn->conn_cpumask);
3595 }
3596
3597 int
3598 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3599 {
3600 int ret;
3601
3602 switch (state) {
3603 case ISTATE_SEND_R2T:
3604 ret = iscsit_send_r2t(cmd, conn);
3605 if (ret < 0)
3606 goto err;
3607 break;
3608 case ISTATE_REMOVE:
3609 spin_lock_bh(&conn->cmd_lock);
3610 list_del_init(&cmd->i_conn_node);
3611 spin_unlock_bh(&conn->cmd_lock);
3612
3613 iscsit_free_cmd(cmd, false);
3614 break;
3615 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3616 iscsit_mod_nopin_response_timer(conn);
3617 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3618 if (ret < 0)
3619 goto err;
3620 break;
3621 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3622 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3623 if (ret < 0)
3624 goto err;
3625 break;
3626 default:
3627 pr_err("Unknown Opcode: 0x%02x ITT:"
3628 " 0x%08x, i_state: %d on CID: %hu\n",
3629 cmd->iscsi_opcode, cmd->init_task_tag, state,
3630 conn->cid);
3631 goto err;
3632 }
3633
3634 return 0;
3635
3636 err:
3637 return -1;
3638 }
3639 EXPORT_SYMBOL(iscsit_immediate_queue);
3640
3641 static int
3642 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3643 {
3644 struct iscsit_transport *t = conn->conn_transport;
3645 struct iscsi_queue_req *qr;
3646 struct iscsi_cmd *cmd;
3647 u8 state;
3648 int ret;
3649
3650 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3651 atomic_set(&conn->check_immediate_queue, 0);
3652 cmd = qr->cmd;
3653 state = qr->state;
3654 kmem_cache_free(lio_qr_cache, qr);
3655
3656 ret = t->iscsit_immediate_queue(conn, cmd, state);
3657 if (ret < 0)
3658 return ret;
3659 }
3660
3661 return 0;
3662 }
3663
3664 int
3665 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3666 {
3667 int ret;
3668
3669 check_rsp_state:
3670 switch (state) {
3671 case ISTATE_SEND_DATAIN:
3672 ret = iscsit_send_datain(cmd, conn);
3673 if (ret < 0)
3674 goto err;
3675 else if (!ret)
3676 /* more drs */
3677 goto check_rsp_state;
3678 else if (ret == 1) {
3679 /* all done */
3680 spin_lock_bh(&cmd->istate_lock);
3681 cmd->i_state = ISTATE_SENT_STATUS;
3682 spin_unlock_bh(&cmd->istate_lock);
3683
3684 if (atomic_read(&conn->check_immediate_queue))
3685 return 1;
3686
3687 return 0;
3688 } else if (ret == 2) {
3689 /* Still must send status,
3690 SCF_TRANSPORT_TASK_SENSE was set */
3691 spin_lock_bh(&cmd->istate_lock);
3692 cmd->i_state = ISTATE_SEND_STATUS;
3693 spin_unlock_bh(&cmd->istate_lock);
3694 state = ISTATE_SEND_STATUS;
3695 goto check_rsp_state;
3696 }
3697
3698 break;
3699 case ISTATE_SEND_STATUS:
3700 case ISTATE_SEND_STATUS_RECOVERY:
3701 ret = iscsit_send_response(cmd, conn);
3702 break;
3703 case ISTATE_SEND_LOGOUTRSP:
3704 ret = iscsit_send_logout(cmd, conn);
3705 break;
3706 case ISTATE_SEND_ASYNCMSG:
3707 ret = iscsit_send_conn_drop_async_message(
3708 cmd, conn);
3709 break;
3710 case ISTATE_SEND_NOPIN:
3711 ret = iscsit_send_nopin(cmd, conn);
3712 break;
3713 case ISTATE_SEND_REJECT:
3714 ret = iscsit_send_reject(cmd, conn);
3715 break;
3716 case ISTATE_SEND_TASKMGTRSP:
3717 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3718 if (ret != 0)
3719 break;
3720 ret = iscsit_tmr_post_handler(cmd, conn);
3721 if (ret != 0)
3722 iscsit_fall_back_to_erl0(conn->sess);
3723 break;
3724 case ISTATE_SEND_TEXTRSP:
3725 ret = iscsit_send_text_rsp(cmd, conn);
3726 break;
3727 default:
3728 pr_err("Unknown Opcode: 0x%02x ITT:"
3729 " 0x%08x, i_state: %d on CID: %hu\n",
3730 cmd->iscsi_opcode, cmd->init_task_tag,
3731 state, conn->cid);
3732 goto err;
3733 }
3734 if (ret < 0)
3735 goto err;
3736
3737 switch (state) {
3738 case ISTATE_SEND_LOGOUTRSP:
3739 if (!iscsit_logout_post_handler(cmd, conn))
3740 return -ECONNRESET;
3741 /* fall through */
3742 case ISTATE_SEND_STATUS:
3743 case ISTATE_SEND_ASYNCMSG:
3744 case ISTATE_SEND_NOPIN:
3745 case ISTATE_SEND_STATUS_RECOVERY:
3746 case ISTATE_SEND_TEXTRSP:
3747 case ISTATE_SEND_TASKMGTRSP:
3748 case ISTATE_SEND_REJECT:
3749 spin_lock_bh(&cmd->istate_lock);
3750 cmd->i_state = ISTATE_SENT_STATUS;
3751 spin_unlock_bh(&cmd->istate_lock);
3752 break;
3753 default:
3754 pr_err("Unknown Opcode: 0x%02x ITT:"
3755 " 0x%08x, i_state: %d on CID: %hu\n",
3756 cmd->iscsi_opcode, cmd->init_task_tag,
3757 cmd->i_state, conn->cid);
3758 goto err;
3759 }
3760
3761 if (atomic_read(&conn->check_immediate_queue))
3762 return 1;
3763
3764 return 0;
3765
3766 err:
3767 return -1;
3768 }
3769 EXPORT_SYMBOL(iscsit_response_queue);
3770
3771 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3772 {
3773 struct iscsit_transport *t = conn->conn_transport;
3774 struct iscsi_queue_req *qr;
3775 struct iscsi_cmd *cmd;
3776 u8 state;
3777 int ret;
3778
3779 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3780 cmd = qr->cmd;
3781 state = qr->state;
3782 kmem_cache_free(lio_qr_cache, qr);
3783
3784 ret = t->iscsit_response_queue(conn, cmd, state);
3785 if (ret == 1 || ret < 0)
3786 return ret;
3787 }
3788
3789 return 0;
3790 }
3791
3792 int iscsi_target_tx_thread(void *arg)
3793 {
3794 int ret = 0;
3795 struct iscsi_conn *conn = arg;
3796 /*
3797 * Allow ourselves to be interrupted by SIGINT so that a
3798 * connection recovery / failure event can be triggered externally.
3799 */
3800 allow_signal(SIGINT);
3801
3802 while (!kthread_should_stop()) {
3803 /*
3804 * Ensure that both TX and RX per connection kthreads
3805 * are scheduled to run on the same CPU.
3806 */
3807 iscsit_thread_check_cpumask(conn, current, 1);
3808
3809 wait_event_interruptible(conn->queues_wq,
3810 !iscsit_conn_all_queues_empty(conn));
3811
3812 if (signal_pending(current))
3813 goto transport_err;
3814
3815 get_immediate:
3816 ret = iscsit_handle_immediate_queue(conn);
3817 if (ret < 0)
3818 goto transport_err;
3819
3820 ret = iscsit_handle_response_queue(conn);
3821 if (ret == 1)
3822 goto get_immediate;
3823 else if (ret == -ECONNRESET)
3824 goto out;
3825 else if (ret < 0)
3826 goto transport_err;
3827 }
3828
3829 transport_err:
3830 /*
3831 * Avoid the normal connection failure code-path if this connection
3832 * is still within LOGIN mode, and iscsi_np process context is
3833 * responsible for cleaning up the early connection failure.
3834 */
3835 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3836 iscsit_take_action_for_connection_exit(conn);
3837 out:
3838 return 0;
3839 }
3840
3841 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3842 {
3843 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3844 struct iscsi_cmd *cmd;
3845 int ret = 0;
3846
3847 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3848 case ISCSI_OP_SCSI_CMD:
3849 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3850 if (!cmd)
3851 goto reject;
3852
3853 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3854 break;
3855 case ISCSI_OP_SCSI_DATA_OUT:
3856 ret = iscsit_handle_data_out(conn, buf);
3857 break;
3858 case ISCSI_OP_NOOP_OUT:
3859 cmd = NULL;
3860 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3861 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3862 if (!cmd)
3863 goto reject;
3864 }
3865 ret = iscsit_handle_nop_out(conn, cmd, buf);
3866 break;
3867 case ISCSI_OP_SCSI_TMFUNC:
3868 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3869 if (!cmd)
3870 goto reject;
3871
3872 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3873 break;
3874 case ISCSI_OP_TEXT:
3875 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3876 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3877 if (!cmd)
3878 goto reject;
3879 } else {
3880 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3881 if (!cmd)
3882 goto reject;
3883 }
3884
3885 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3886 break;
3887 case ISCSI_OP_LOGOUT:
3888 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3889 if (!cmd)
3890 goto reject;
3891
3892 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3893 if (ret > 0)
3894 wait_for_completion_timeout(&conn->conn_logout_comp,
3895 SECONDS_FOR_LOGOUT_COMP * HZ);
3896 break;
3897 case ISCSI_OP_SNACK:
3898 ret = iscsit_handle_snack(conn, buf);
3899 break;
3900 default:
3901 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3902 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3903 pr_err("Cannot recover from unknown"
3904 " opcode while ERL=0, closing iSCSI connection.\n");
3905 return -1;
3906 }
3907 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3908 " closing iSCSI connection.\n");
3909 ret = -1;
3910 break;
3911 }
3912
3913 return ret;
3914 reject:
3915 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3916 }
3917
3918 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3919 {
3920 bool ret;
3921
3922 spin_lock_bh(&conn->state_lock);
3923 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3924 spin_unlock_bh(&conn->state_lock);
3925
3926 return ret;
3927 }
3928
3929 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3930 {
3931 int ret;
3932 u8 buffer[ISCSI_HDR_LEN], opcode;
3933 u32 checksum = 0, digest = 0;
3934 struct kvec iov;
3935
3936 while (!kthread_should_stop()) {
3937 /*
3938 * Ensure that both TX and RX per connection kthreads
3939 * are scheduled to run on the same CPU.
3940 */
3941 iscsit_thread_check_cpumask(conn, current, 0);
3942
3943 memset(buffer, 0, ISCSI_HDR_LEN);
3944 memset(&iov, 0, sizeof(struct kvec));
3945
3946 iov.iov_base = buffer;
3947 iov.iov_len = ISCSI_HDR_LEN;
3948
3949 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3950 if (ret != ISCSI_HDR_LEN) {
3951 iscsit_rx_thread_wait_for_tcp(conn);
3952 return;
3953 }
3954
3955 if (conn->conn_ops->HeaderDigest) {
3956 iov.iov_base = &digest;
3957 iov.iov_len = ISCSI_CRC_LEN;
3958
3959 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3960 if (ret != ISCSI_CRC_LEN) {
3961 iscsit_rx_thread_wait_for_tcp(conn);
3962 return;
3963 }
3964
3965 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3966 buffer, ISCSI_HDR_LEN,
3967 0, NULL, (u8 *)&checksum);
3968
3969 if (digest != checksum) {
3970 pr_err("HeaderDigest CRC32C failed,"
3971 " received 0x%08x, computed 0x%08x\n",
3972 digest, checksum);
3973 /*
3974 * Set the PDU to 0xff so it will intentionally
3975 * hit default in the switch below.
3976 */
3977 memset(buffer, 0xff, ISCSI_HDR_LEN);
3978 atomic_long_inc(&conn->sess->conn_digest_errors);
3979 } else {
3980 pr_debug("Got HeaderDigest CRC32C"
3981 " 0x%08x\n", checksum);
3982 }
3983 }
3984
3985 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3986 return;
3987
3988 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3989
3990 if (conn->sess->sess_ops->SessionType &&
3991 ((!(opcode & ISCSI_OP_TEXT)) ||
3992 (!(opcode & ISCSI_OP_LOGOUT)))) {
3993 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3994 " while in Discovery Session, rejecting.\n", opcode);
3995 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
3996 buffer);
3997 return;
3998 }
3999
4000 ret = iscsi_target_rx_opcode(conn, buffer);
4001 if (ret < 0)
4002 return;
4003 }
4004 }
4005
4006 int iscsi_target_rx_thread(void *arg)
4007 {
4008 int rc;
4009 struct iscsi_conn *conn = arg;
4010
4011 /*
4012 * Allow ourselves to be interrupted by SIGINT so that a
4013 * connection recovery / failure event can be triggered externally.
4014 */
4015 allow_signal(SIGINT);
4016 /*
4017 * Wait for iscsi_post_login_handler() to complete before allowing
4018 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4019 */
4020 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4021 if (rc < 0 || iscsi_target_check_conn_state(conn))
4022 return 0;
4023
4024 if (!conn->conn_transport->iscsit_get_rx_pdu)
4025 return 0;
4026
4027 conn->conn_transport->iscsit_get_rx_pdu(conn);
4028
4029 if (!signal_pending(current))
4030 atomic_set(&conn->transport_failed, 1);
4031 iscsit_take_action_for_connection_exit(conn);
4032 return 0;
4033 }
4034
4035 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4036 {
4037 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4038 struct iscsi_session *sess = conn->sess;
4039 /*
4040 * We expect this function to only ever be called from either RX or TX
4041 * thread context via iscsit_close_connection() once the other context
4042 * has been reset -> returned sleeping pre-handler state.
4043 */
4044 spin_lock_bh(&conn->cmd_lock);
4045 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4046
4047 list_del_init(&cmd->i_conn_node);
4048 spin_unlock_bh(&conn->cmd_lock);
4049
4050 iscsit_increment_maxcmdsn(cmd, sess);
4051
4052 iscsit_free_cmd(cmd, true);
4053
4054 spin_lock_bh(&conn->cmd_lock);
4055 }
4056 spin_unlock_bh(&conn->cmd_lock);
4057 }
4058
4059 static void iscsit_stop_timers_for_cmds(
4060 struct iscsi_conn *conn)
4061 {
4062 struct iscsi_cmd *cmd;
4063
4064 spin_lock_bh(&conn->cmd_lock);
4065 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4066 if (cmd->data_direction == DMA_TO_DEVICE)
4067 iscsit_stop_dataout_timer(cmd);
4068 }
4069 spin_unlock_bh(&conn->cmd_lock);
4070 }
4071
4072 int iscsit_close_connection(
4073 struct iscsi_conn *conn)
4074 {
4075 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4076 struct iscsi_session *sess = conn->sess;
4077
4078 pr_debug("Closing iSCSI connection CID %hu on SID:"
4079 " %u\n", conn->cid, sess->sid);
4080 /*
4081 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4082 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4083 * sleeping and the logout response never got sent because the
4084 * connection failed.
4085 *
4086 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4087 * to signal logout response TX interrupt completion. Go ahead and skip
4088 * this for iser since isert_rx_opcode() does not wait on logout failure,
4089 * and to avoid iscsi_conn pointer dereference in iser-target code.
4090 */
4091 if (!conn->conn_transport->rdma_shutdown)
4092 complete(&conn->conn_logout_comp);
4093
4094 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4095 if (conn->tx_thread &&
4096 cmpxchg(&conn->tx_thread_active, true, false)) {
4097 send_sig(SIGINT, conn->tx_thread, 1);
4098 kthread_stop(conn->tx_thread);
4099 }
4100 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4101 if (conn->rx_thread &&
4102 cmpxchg(&conn->rx_thread_active, true, false)) {
4103 send_sig(SIGINT, conn->rx_thread, 1);
4104 kthread_stop(conn->rx_thread);
4105 }
4106 }
4107
4108 spin_lock(&iscsit_global->ts_bitmap_lock);
4109 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4110 get_order(1));
4111 spin_unlock(&iscsit_global->ts_bitmap_lock);
4112
4113 iscsit_stop_timers_for_cmds(conn);
4114 iscsit_stop_nopin_response_timer(conn);
4115 iscsit_stop_nopin_timer(conn);
4116
4117 if (conn->conn_transport->iscsit_wait_conn)
4118 conn->conn_transport->iscsit_wait_conn(conn);
4119
4120 /*
4121 * During Connection recovery drop unacknowledged out of order
4122 * commands for this connection, and prepare the other commands
4123 * for realligence.
4124 *
4125 * During normal operation clear the out of order commands (but
4126 * do not free the struct iscsi_ooo_cmdsn's) and release all
4127 * struct iscsi_cmds.
4128 */
4129 if (atomic_read(&conn->connection_recovery)) {
4130 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4131 iscsit_prepare_cmds_for_realligance(conn);
4132 } else {
4133 iscsit_clear_ooo_cmdsns_for_conn(conn);
4134 iscsit_release_commands_from_conn(conn);
4135 }
4136 iscsit_free_queue_reqs_for_conn(conn);
4137
4138 /*
4139 * Handle decrementing session or connection usage count if
4140 * a logout response was not able to be sent because the
4141 * connection failed. Fall back to Session Recovery here.
4142 */
4143 if (atomic_read(&conn->conn_logout_remove)) {
4144 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4145 iscsit_dec_conn_usage_count(conn);
4146 iscsit_dec_session_usage_count(sess);
4147 }
4148 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4149 iscsit_dec_conn_usage_count(conn);
4150
4151 atomic_set(&conn->conn_logout_remove, 0);
4152 atomic_set(&sess->session_reinstatement, 0);
4153 atomic_set(&sess->session_fall_back_to_erl0, 1);
4154 }
4155
4156 spin_lock_bh(&sess->conn_lock);
4157 list_del(&conn->conn_list);
4158
4159 /*
4160 * Attempt to let the Initiator know this connection failed by
4161 * sending an Connection Dropped Async Message on another
4162 * active connection.
4163 */
4164 if (atomic_read(&conn->connection_recovery))
4165 iscsit_build_conn_drop_async_message(conn);
4166
4167 spin_unlock_bh(&sess->conn_lock);
4168
4169 /*
4170 * If connection reinstatement is being performed on this connection,
4171 * up the connection reinstatement semaphore that is being blocked on
4172 * in iscsit_cause_connection_reinstatement().
4173 */
4174 spin_lock_bh(&conn->state_lock);
4175 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4176 spin_unlock_bh(&conn->state_lock);
4177 complete(&conn->conn_wait_comp);
4178 wait_for_completion(&conn->conn_post_wait_comp);
4179 spin_lock_bh(&conn->state_lock);
4180 }
4181
4182 /*
4183 * If connection reinstatement is being performed on this connection
4184 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4185 * connection wait rcfr semaphore that is being blocked on
4186 * an iscsit_connection_reinstatement_rcfr().
4187 */
4188 if (atomic_read(&conn->connection_wait_rcfr)) {
4189 spin_unlock_bh(&conn->state_lock);
4190 complete(&conn->conn_wait_rcfr_comp);
4191 wait_for_completion(&conn->conn_post_wait_comp);
4192 spin_lock_bh(&conn->state_lock);
4193 }
4194 atomic_set(&conn->connection_reinstatement, 1);
4195 spin_unlock_bh(&conn->state_lock);
4196
4197 /*
4198 * If any other processes are accessing this connection pointer we
4199 * must wait until they have completed.
4200 */
4201 iscsit_check_conn_usage_count(conn);
4202
4203 ahash_request_free(conn->conn_tx_hash);
4204 if (conn->conn_rx_hash) {
4205 struct crypto_ahash *tfm;
4206
4207 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4208 ahash_request_free(conn->conn_rx_hash);
4209 crypto_free_ahash(tfm);
4210 }
4211
4212 free_cpumask_var(conn->conn_cpumask);
4213
4214 kfree(conn->conn_ops);
4215 conn->conn_ops = NULL;
4216
4217 if (conn->sock)
4218 sock_release(conn->sock);
4219
4220 if (conn->conn_transport->iscsit_free_conn)
4221 conn->conn_transport->iscsit_free_conn(conn);
4222
4223 iscsit_put_transport(conn->conn_transport);
4224
4225 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4226 conn->conn_state = TARG_CONN_STATE_FREE;
4227 kfree(conn);
4228
4229 spin_lock_bh(&sess->conn_lock);
4230 atomic_dec(&sess->nconn);
4231 pr_debug("Decremented iSCSI connection count to %hu from node:"
4232 " %s\n", atomic_read(&sess->nconn),
4233 sess->sess_ops->InitiatorName);
4234 /*
4235 * Make sure that if one connection fails in an non ERL=2 iSCSI
4236 * Session that they all fail.
4237 */
4238 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4239 !atomic_read(&sess->session_logout))
4240 atomic_set(&sess->session_fall_back_to_erl0, 1);
4241
4242 /*
4243 * If this was not the last connection in the session, and we are
4244 * performing session reinstatement or falling back to ERL=0, call
4245 * iscsit_stop_session() without sleeping to shutdown the other
4246 * active connections.
4247 */
4248 if (atomic_read(&sess->nconn)) {
4249 if (!atomic_read(&sess->session_reinstatement) &&
4250 !atomic_read(&sess->session_fall_back_to_erl0)) {
4251 spin_unlock_bh(&sess->conn_lock);
4252 return 0;
4253 }
4254 if (!atomic_read(&sess->session_stop_active)) {
4255 atomic_set(&sess->session_stop_active, 1);
4256 spin_unlock_bh(&sess->conn_lock);
4257 iscsit_stop_session(sess, 0, 0);
4258 return 0;
4259 }
4260 spin_unlock_bh(&sess->conn_lock);
4261 return 0;
4262 }
4263
4264 /*
4265 * If this was the last connection in the session and one of the
4266 * following is occurring:
4267 *
4268 * Session Reinstatement is not being performed, and are falling back
4269 * to ERL=0 call iscsit_close_session().
4270 *
4271 * Session Logout was requested. iscsit_close_session() will be called
4272 * elsewhere.
4273 *
4274 * Session Continuation is not being performed, start the Time2Retain
4275 * handler and check if sleep_on_sess_wait_sem is active.
4276 */
4277 if (!atomic_read(&sess->session_reinstatement) &&
4278 atomic_read(&sess->session_fall_back_to_erl0)) {
4279 spin_unlock_bh(&sess->conn_lock);
4280 iscsit_close_session(sess);
4281
4282 return 0;
4283 } else if (atomic_read(&sess->session_logout)) {
4284 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4285 sess->session_state = TARG_SESS_STATE_FREE;
4286 spin_unlock_bh(&sess->conn_lock);
4287
4288 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4289 complete(&sess->session_wait_comp);
4290
4291 return 0;
4292 } else {
4293 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4294 sess->session_state = TARG_SESS_STATE_FAILED;
4295
4296 if (!atomic_read(&sess->session_continuation)) {
4297 spin_unlock_bh(&sess->conn_lock);
4298 iscsit_start_time2retain_handler(sess);
4299 } else
4300 spin_unlock_bh(&sess->conn_lock);
4301
4302 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4303 complete(&sess->session_wait_comp);
4304
4305 return 0;
4306 }
4307 }
4308
4309 /*
4310 * If the iSCSI Session for the iSCSI Initiator Node exists,
4311 * forcefully shutdown the iSCSI NEXUS.
4312 */
4313 int iscsit_close_session(struct iscsi_session *sess)
4314 {
4315 struct iscsi_portal_group *tpg = sess->tpg;
4316 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4317
4318 if (atomic_read(&sess->nconn)) {
4319 pr_err("%d connection(s) still exist for iSCSI session"
4320 " to %s\n", atomic_read(&sess->nconn),
4321 sess->sess_ops->InitiatorName);
4322 BUG();
4323 }
4324
4325 spin_lock_bh(&se_tpg->session_lock);
4326 atomic_set(&sess->session_logout, 1);
4327 atomic_set(&sess->session_reinstatement, 1);
4328 iscsit_stop_time2retain_timer(sess);
4329 spin_unlock_bh(&se_tpg->session_lock);
4330
4331 /*
4332 * transport_deregister_session_configfs() will clear the
4333 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4334 * can be setting it again with __transport_register_session() in
4335 * iscsi_post_login_handler() again after the iscsit_stop_session()
4336 * completes in iscsi_np context.
4337 */
4338 transport_deregister_session_configfs(sess->se_sess);
4339
4340 /*
4341 * If any other processes are accessing this session pointer we must
4342 * wait until they have completed. If we are in an interrupt (the
4343 * time2retain handler) and contain and active session usage count we
4344 * restart the timer and exit.
4345 */
4346 if (!in_interrupt()) {
4347 if (iscsit_check_session_usage_count(sess) == 1)
4348 iscsit_stop_session(sess, 1, 1);
4349 } else {
4350 if (iscsit_check_session_usage_count(sess) == 2) {
4351 atomic_set(&sess->session_logout, 0);
4352 iscsit_start_time2retain_handler(sess);
4353 return 0;
4354 }
4355 }
4356
4357 transport_deregister_session(sess->se_sess);
4358
4359 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4360 iscsit_free_connection_recovery_entires(sess);
4361
4362 iscsit_free_all_ooo_cmdsns(sess);
4363
4364 spin_lock_bh(&se_tpg->session_lock);
4365 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4366 sess->session_state = TARG_SESS_STATE_FREE;
4367 pr_debug("Released iSCSI session from node: %s\n",
4368 sess->sess_ops->InitiatorName);
4369 tpg->nsessions--;
4370 if (tpg->tpg_tiqn)
4371 tpg->tpg_tiqn->tiqn_nsessions--;
4372
4373 pr_debug("Decremented number of active iSCSI Sessions on"
4374 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4375
4376 spin_lock(&sess_idr_lock);
4377 idr_remove(&sess_idr, sess->session_index);
4378 spin_unlock(&sess_idr_lock);
4379
4380 kfree(sess->sess_ops);
4381 sess->sess_ops = NULL;
4382 spin_unlock_bh(&se_tpg->session_lock);
4383
4384 kfree(sess);
4385 return 0;
4386 }
4387
4388 static void iscsit_logout_post_handler_closesession(
4389 struct iscsi_conn *conn)
4390 {
4391 struct iscsi_session *sess = conn->sess;
4392 int sleep = 1;
4393 /*
4394 * Traditional iscsi/tcp will invoke this logic from TX thread
4395 * context during session logout, so clear tx_thread_active and
4396 * sleep if iscsit_close_connection() has not already occured.
4397 *
4398 * Since iser-target invokes this logic from it's own workqueue,
4399 * always sleep waiting for RX/TX thread shutdown to complete
4400 * within iscsit_close_connection().
4401 */
4402 if (!conn->conn_transport->rdma_shutdown)
4403 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4404
4405 atomic_set(&conn->conn_logout_remove, 0);
4406 complete(&conn->conn_logout_comp);
4407
4408 iscsit_dec_conn_usage_count(conn);
4409 iscsit_stop_session(sess, sleep, sleep);
4410 iscsit_dec_session_usage_count(sess);
4411 iscsit_close_session(sess);
4412 }
4413
4414 static void iscsit_logout_post_handler_samecid(
4415 struct iscsi_conn *conn)
4416 {
4417 int sleep = 1;
4418
4419 if (!conn->conn_transport->rdma_shutdown)
4420 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4421
4422 atomic_set(&conn->conn_logout_remove, 0);
4423 complete(&conn->conn_logout_comp);
4424
4425 iscsit_cause_connection_reinstatement(conn, sleep);
4426 iscsit_dec_conn_usage_count(conn);
4427 }
4428
4429 static void iscsit_logout_post_handler_diffcid(
4430 struct iscsi_conn *conn,
4431 u16 cid)
4432 {
4433 struct iscsi_conn *l_conn;
4434 struct iscsi_session *sess = conn->sess;
4435 bool conn_found = false;
4436
4437 if (!sess)
4438 return;
4439
4440 spin_lock_bh(&sess->conn_lock);
4441 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4442 if (l_conn->cid == cid) {
4443 iscsit_inc_conn_usage_count(l_conn);
4444 conn_found = true;
4445 break;
4446 }
4447 }
4448 spin_unlock_bh(&sess->conn_lock);
4449
4450 if (!conn_found)
4451 return;
4452
4453 if (l_conn->sock)
4454 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4455
4456 spin_lock_bh(&l_conn->state_lock);
4457 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4458 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4459 spin_unlock_bh(&l_conn->state_lock);
4460
4461 iscsit_cause_connection_reinstatement(l_conn, 1);
4462 iscsit_dec_conn_usage_count(l_conn);
4463 }
4464
4465 /*
4466 * Return of 0 causes the TX thread to restart.
4467 */
4468 int iscsit_logout_post_handler(
4469 struct iscsi_cmd *cmd,
4470 struct iscsi_conn *conn)
4471 {
4472 int ret = 0;
4473
4474 switch (cmd->logout_reason) {
4475 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4476 switch (cmd->logout_response) {
4477 case ISCSI_LOGOUT_SUCCESS:
4478 case ISCSI_LOGOUT_CLEANUP_FAILED:
4479 default:
4480 iscsit_logout_post_handler_closesession(conn);
4481 break;
4482 }
4483 ret = 0;
4484 break;
4485 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4486 if (conn->cid == cmd->logout_cid) {
4487 switch (cmd->logout_response) {
4488 case ISCSI_LOGOUT_SUCCESS:
4489 case ISCSI_LOGOUT_CLEANUP_FAILED:
4490 default:
4491 iscsit_logout_post_handler_samecid(conn);
4492 break;
4493 }
4494 ret = 0;
4495 } else {
4496 switch (cmd->logout_response) {
4497 case ISCSI_LOGOUT_SUCCESS:
4498 iscsit_logout_post_handler_diffcid(conn,
4499 cmd->logout_cid);
4500 break;
4501 case ISCSI_LOGOUT_CID_NOT_FOUND:
4502 case ISCSI_LOGOUT_CLEANUP_FAILED:
4503 default:
4504 break;
4505 }
4506 ret = 1;
4507 }
4508 break;
4509 case ISCSI_LOGOUT_REASON_RECOVERY:
4510 switch (cmd->logout_response) {
4511 case ISCSI_LOGOUT_SUCCESS:
4512 case ISCSI_LOGOUT_CID_NOT_FOUND:
4513 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4514 case ISCSI_LOGOUT_CLEANUP_FAILED:
4515 default:
4516 break;
4517 }
4518 ret = 1;
4519 break;
4520 default:
4521 break;
4522
4523 }
4524 return ret;
4525 }
4526 EXPORT_SYMBOL(iscsit_logout_post_handler);
4527
4528 void iscsit_fail_session(struct iscsi_session *sess)
4529 {
4530 struct iscsi_conn *conn;
4531
4532 spin_lock_bh(&sess->conn_lock);
4533 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4534 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4535 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4536 }
4537 spin_unlock_bh(&sess->conn_lock);
4538
4539 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4540 sess->session_state = TARG_SESS_STATE_FAILED;
4541 }
4542
4543 int iscsit_free_session(struct iscsi_session *sess)
4544 {
4545 u16 conn_count = atomic_read(&sess->nconn);
4546 struct iscsi_conn *conn, *conn_tmp = NULL;
4547 int is_last;
4548
4549 spin_lock_bh(&sess->conn_lock);
4550 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4551
4552 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4553 conn_list) {
4554 if (conn_count == 0)
4555 break;
4556
4557 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4558 is_last = 1;
4559 } else {
4560 iscsit_inc_conn_usage_count(conn_tmp);
4561 is_last = 0;
4562 }
4563 iscsit_inc_conn_usage_count(conn);
4564
4565 spin_unlock_bh(&sess->conn_lock);
4566 iscsit_cause_connection_reinstatement(conn, 1);
4567 spin_lock_bh(&sess->conn_lock);
4568
4569 iscsit_dec_conn_usage_count(conn);
4570 if (is_last == 0)
4571 iscsit_dec_conn_usage_count(conn_tmp);
4572
4573 conn_count--;
4574 }
4575
4576 if (atomic_read(&sess->nconn)) {
4577 spin_unlock_bh(&sess->conn_lock);
4578 wait_for_completion(&sess->session_wait_comp);
4579 } else
4580 spin_unlock_bh(&sess->conn_lock);
4581
4582 iscsit_close_session(sess);
4583 return 0;
4584 }
4585
4586 void iscsit_stop_session(
4587 struct iscsi_session *sess,
4588 int session_sleep,
4589 int connection_sleep)
4590 {
4591 u16 conn_count = atomic_read(&sess->nconn);
4592 struct iscsi_conn *conn, *conn_tmp = NULL;
4593 int is_last;
4594
4595 spin_lock_bh(&sess->conn_lock);
4596 if (session_sleep)
4597 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4598
4599 if (connection_sleep) {
4600 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4601 conn_list) {
4602 if (conn_count == 0)
4603 break;
4604
4605 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4606 is_last = 1;
4607 } else {
4608 iscsit_inc_conn_usage_count(conn_tmp);
4609 is_last = 0;
4610 }
4611 iscsit_inc_conn_usage_count(conn);
4612
4613 spin_unlock_bh(&sess->conn_lock);
4614 iscsit_cause_connection_reinstatement(conn, 1);
4615 spin_lock_bh(&sess->conn_lock);
4616
4617 iscsit_dec_conn_usage_count(conn);
4618 if (is_last == 0)
4619 iscsit_dec_conn_usage_count(conn_tmp);
4620 conn_count--;
4621 }
4622 } else {
4623 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4624 iscsit_cause_connection_reinstatement(conn, 0);
4625 }
4626
4627 if (session_sleep && atomic_read(&sess->nconn)) {
4628 spin_unlock_bh(&sess->conn_lock);
4629 wait_for_completion(&sess->session_wait_comp);
4630 } else
4631 spin_unlock_bh(&sess->conn_lock);
4632 }
4633
4634 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4635 {
4636 struct iscsi_session *sess;
4637 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4638 struct se_session *se_sess, *se_sess_tmp;
4639 LIST_HEAD(free_list);
4640 int session_count = 0;
4641
4642 spin_lock_bh(&se_tpg->session_lock);
4643 if (tpg->nsessions && !force) {
4644 spin_unlock_bh(&se_tpg->session_lock);
4645 return -1;
4646 }
4647
4648 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4649 sess_list) {
4650 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4651
4652 spin_lock(&sess->conn_lock);
4653 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4654 atomic_read(&sess->session_logout) ||
4655 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4656 spin_unlock(&sess->conn_lock);
4657 continue;
4658 }
4659 atomic_set(&sess->session_reinstatement, 1);
4660 spin_unlock(&sess->conn_lock);
4661
4662 list_move_tail(&se_sess->sess_list, &free_list);
4663 }
4664 spin_unlock_bh(&se_tpg->session_lock);
4665
4666 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4667 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4668
4669 iscsit_free_session(sess);
4670 session_count++;
4671 }
4672
4673 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4674 " Group: %hu\n", session_count, tpg->tpgt);
4675 return 0;
4676 }
4677
4678 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4679 MODULE_VERSION("4.1.x");
4680 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4681 MODULE_LICENSE("GPL");
4682
4683 module_init(iscsi_target_init_module);
4684 module_exit(iscsi_target_cleanup_module);
Linux with added FPC-III support