projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'nvmf-4.8-rc' of git://git.infradead.org/nvme-fabrics into for-linus
[deliverable/linux.git] / drivers / target / iscsi / iscsi_target.c
1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19 #include <crypto/hash.h>
20 #include <linux/string.h>
21 #include <linux/kthread.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
25 #include <linux/idr.h>
26 #include <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 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
497 list_del_init(&cmd->i_conn_node);
498 spin_unlock_bh(&conn->cmd_lock);
499
500 __iscsit_free_cmd(cmd, scsi_cmd, true);
501 }
502 EXPORT_SYMBOL(iscsit_aborted_task);
503
504 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
505 u32, u32, u8 *, u8 *);
506 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
507
508 static int
509 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
510 const void *data_buf, u32 data_buf_len)
511 {
512 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
513 struct kvec *iov;
514 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
515 int ret;
516
517 iov = &cmd->iov_misc[0];
518 iov[niov].iov_base = cmd->pdu;
519 iov[niov++].iov_len = ISCSI_HDR_LEN;
520
521 if (conn->conn_ops->HeaderDigest) {
522 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
523
524 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
525 ISCSI_HDR_LEN, 0, NULL,
526 (u8 *)header_digest);
527
528 iov[0].iov_len += ISCSI_CRC_LEN;
529 tx_size += ISCSI_CRC_LEN;
530 pr_debug("Attaching CRC32C HeaderDigest"
531 " to opcode 0x%x 0x%08x\n",
532 hdr->opcode, *header_digest);
533 }
534
535 if (data_buf_len) {
536 u32 padding = ((-data_buf_len) & 3);
537
538 iov[niov].iov_base = (void *)data_buf;
539 iov[niov++].iov_len = data_buf_len;
540 tx_size += data_buf_len;
541
542 if (padding != 0) {
543 iov[niov].iov_base = &cmd->pad_bytes;
544 iov[niov++].iov_len = padding;
545 tx_size += padding;
546 pr_debug("Attaching %u additional"
547 " padding bytes.\n", padding);
548 }
549
550 if (conn->conn_ops->DataDigest) {
551 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
552 data_buf, data_buf_len,
553 padding,
554 (u8 *)&cmd->pad_bytes,
555 (u8 *)&cmd->data_crc);
556
557 iov[niov].iov_base = &cmd->data_crc;
558 iov[niov++].iov_len = ISCSI_CRC_LEN;
559 tx_size += ISCSI_CRC_LEN;
560 pr_debug("Attached DataDigest for %u"
561 " bytes opcode 0x%x, CRC 0x%08x\n",
562 data_buf_len, hdr->opcode, cmd->data_crc);
563 }
564 }
565
566 cmd->iov_misc_count = niov;
567 cmd->tx_size = tx_size;
568
569 ret = iscsit_send_tx_data(cmd, conn, 1);
570 if (ret < 0) {
571 iscsit_tx_thread_wait_for_tcp(conn);
572 return ret;
573 }
574
575 return 0;
576 }
577
578 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
579 static void iscsit_unmap_iovec(struct iscsi_cmd *);
580 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
581 u32, u32, u32, u8 *);
582 static int
583 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
584 const struct iscsi_datain *datain)
585 {
586 struct kvec *iov;
587 u32 iov_count = 0, tx_size = 0;
588 int ret, iov_ret;
589
590 iov = &cmd->iov_data[0];
591 iov[iov_count].iov_base = cmd->pdu;
592 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
593 tx_size += ISCSI_HDR_LEN;
594
595 if (conn->conn_ops->HeaderDigest) {
596 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
597
598 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
599 ISCSI_HDR_LEN, 0, NULL,
600 (u8 *)header_digest);
601
602 iov[0].iov_len += ISCSI_CRC_LEN;
603 tx_size += ISCSI_CRC_LEN;
604
605 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
606 *header_digest);
607 }
608
609 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
610 datain->offset, datain->length);
611 if (iov_ret < 0)
612 return -1;
613
614 iov_count += iov_ret;
615 tx_size += datain->length;
616
617 cmd->padding = ((-datain->length) & 3);
618 if (cmd->padding) {
619 iov[iov_count].iov_base = cmd->pad_bytes;
620 iov[iov_count++].iov_len = cmd->padding;
621 tx_size += cmd->padding;
622
623 pr_debug("Attaching %u padding bytes\n", cmd->padding);
624 }
625
626 if (conn->conn_ops->DataDigest) {
627 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
628 cmd, datain->offset,
629 datain->length,
630 cmd->padding,
631 cmd->pad_bytes);
632
633 iov[iov_count].iov_base = &cmd->data_crc;
634 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
635 tx_size += ISCSI_CRC_LEN;
636
637 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
638 datain->length + cmd->padding, cmd->data_crc);
639 }
640
641 cmd->iov_data_count = iov_count;
642 cmd->tx_size = tx_size;
643
644 ret = iscsit_fe_sendpage_sg(cmd, conn);
645
646 iscsit_unmap_iovec(cmd);
647
648 if (ret < 0) {
649 iscsit_tx_thread_wait_for_tcp(conn);
650 return ret;
651 }
652
653 return 0;
654 }
655
656 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
657 struct iscsi_datain_req *dr, const void *buf,
658 u32 buf_len)
659 {
660 if (dr)
661 return iscsit_xmit_datain_pdu(conn, cmd, buf);
662 else
663 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
664 }
665
666 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
667 {
668 return TARGET_PROT_NORMAL;
669 }
670
671 static struct iscsit_transport iscsi_target_transport = {
672 .name = "iSCSI/TCP",
673 .transport_type = ISCSI_TCP,
674 .rdma_shutdown = false,
675 .owner = NULL,
676 .iscsit_setup_np = iscsit_setup_np,
677 .iscsit_accept_np = iscsit_accept_np,
678 .iscsit_free_np = iscsit_free_np,
679 .iscsit_get_login_rx = iscsit_get_login_rx,
680 .iscsit_put_login_tx = iscsit_put_login_tx,
681 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
682 .iscsit_immediate_queue = iscsit_immediate_queue,
683 .iscsit_response_queue = iscsit_response_queue,
684 .iscsit_queue_data_in = iscsit_queue_rsp,
685 .iscsit_queue_status = iscsit_queue_rsp,
686 .iscsit_aborted_task = iscsit_aborted_task,
687 .iscsit_xmit_pdu = iscsit_xmit_pdu,
688 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
689 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
690 };
691
692 static int __init iscsi_target_init_module(void)
693 {
694 int ret = 0, size;
695
696 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
697
698 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
699 if (!iscsit_global) {
700 pr_err("Unable to allocate memory for iscsit_global\n");
701 return -1;
702 }
703 spin_lock_init(&iscsit_global->ts_bitmap_lock);
704 mutex_init(&auth_id_lock);
705 spin_lock_init(&sess_idr_lock);
706 idr_init(&tiqn_idr);
707 idr_init(&sess_idr);
708
709 ret = target_register_template(&iscsi_ops);
710 if (ret)
711 goto out;
712
713 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
714 iscsit_global->ts_bitmap = vzalloc(size);
715 if (!iscsit_global->ts_bitmap) {
716 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
717 goto configfs_out;
718 }
719
720 lio_qr_cache = kmem_cache_create("lio_qr_cache",
721 sizeof(struct iscsi_queue_req),
722 __alignof__(struct iscsi_queue_req), 0, NULL);
723 if (!lio_qr_cache) {
724 pr_err("nable to kmem_cache_create() for"
725 " lio_qr_cache\n");
726 goto bitmap_out;
727 }
728
729 lio_dr_cache = kmem_cache_create("lio_dr_cache",
730 sizeof(struct iscsi_datain_req),
731 __alignof__(struct iscsi_datain_req), 0, NULL);
732 if (!lio_dr_cache) {
733 pr_err("Unable to kmem_cache_create() for"
734 " lio_dr_cache\n");
735 goto qr_out;
736 }
737
738 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
739 sizeof(struct iscsi_ooo_cmdsn),
740 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
741 if (!lio_ooo_cache) {
742 pr_err("Unable to kmem_cache_create() for"
743 " lio_ooo_cache\n");
744 goto dr_out;
745 }
746
747 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
748 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
749 0, NULL);
750 if (!lio_r2t_cache) {
751 pr_err("Unable to kmem_cache_create() for"
752 " lio_r2t_cache\n");
753 goto ooo_out;
754 }
755
756 iscsit_register_transport(&iscsi_target_transport);
757
758 if (iscsit_load_discovery_tpg() < 0)
759 goto r2t_out;
760
761 return ret;
762 r2t_out:
763 iscsit_unregister_transport(&iscsi_target_transport);
764 kmem_cache_destroy(lio_r2t_cache);
765 ooo_out:
766 kmem_cache_destroy(lio_ooo_cache);
767 dr_out:
768 kmem_cache_destroy(lio_dr_cache);
769 qr_out:
770 kmem_cache_destroy(lio_qr_cache);
771 bitmap_out:
772 vfree(iscsit_global->ts_bitmap);
773 configfs_out:
774 /* XXX: this probably wants it to be it's own unwind step.. */
775 if (iscsit_global->discovery_tpg)
776 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
777 target_unregister_template(&iscsi_ops);
778 out:
779 kfree(iscsit_global);
780 return -ENOMEM;
781 }
782
783 static void __exit iscsi_target_cleanup_module(void)
784 {
785 iscsit_release_discovery_tpg();
786 iscsit_unregister_transport(&iscsi_target_transport);
787 kmem_cache_destroy(lio_qr_cache);
788 kmem_cache_destroy(lio_dr_cache);
789 kmem_cache_destroy(lio_ooo_cache);
790 kmem_cache_destroy(lio_r2t_cache);
791
792 /*
793 * Shutdown discovery sessions and disable discovery TPG
794 */
795 if (iscsit_global->discovery_tpg)
796 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
797
798 target_unregister_template(&iscsi_ops);
799
800 vfree(iscsit_global->ts_bitmap);
801 kfree(iscsit_global);
802 }
803
804 int iscsit_add_reject(
805 struct iscsi_conn *conn,
806 u8 reason,
807 unsigned char *buf)
808 {
809 struct iscsi_cmd *cmd;
810
811 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
812 if (!cmd)
813 return -1;
814
815 cmd->iscsi_opcode = ISCSI_OP_REJECT;
816 cmd->reject_reason = reason;
817
818 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
819 if (!cmd->buf_ptr) {
820 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
821 iscsit_free_cmd(cmd, false);
822 return -1;
823 }
824
825 spin_lock_bh(&conn->cmd_lock);
826 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
827 spin_unlock_bh(&conn->cmd_lock);
828
829 cmd->i_state = ISTATE_SEND_REJECT;
830 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
831
832 return -1;
833 }
834 EXPORT_SYMBOL(iscsit_add_reject);
835
836 static int iscsit_add_reject_from_cmd(
837 struct iscsi_cmd *cmd,
838 u8 reason,
839 bool add_to_conn,
840 unsigned char *buf)
841 {
842 struct iscsi_conn *conn;
843
844 if (!cmd->conn) {
845 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
846 cmd->init_task_tag);
847 return -1;
848 }
849 conn = cmd->conn;
850
851 cmd->iscsi_opcode = ISCSI_OP_REJECT;
852 cmd->reject_reason = reason;
853
854 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
855 if (!cmd->buf_ptr) {
856 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
857 iscsit_free_cmd(cmd, false);
858 return -1;
859 }
860
861 if (add_to_conn) {
862 spin_lock_bh(&conn->cmd_lock);
863 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
864 spin_unlock_bh(&conn->cmd_lock);
865 }
866
867 cmd->i_state = ISTATE_SEND_REJECT;
868 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
869 /*
870 * Perform the kref_put now if se_cmd has already been setup by
871 * scsit_setup_scsi_cmd()
872 */
873 if (cmd->se_cmd.se_tfo != NULL) {
874 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
875 target_put_sess_cmd(&cmd->se_cmd);
876 }
877 return -1;
878 }
879
880 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
881 unsigned char *buf)
882 {
883 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
884 }
885
886 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
887 {
888 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
889 }
890 EXPORT_SYMBOL(iscsit_reject_cmd);
891
892 /*
893 * Map some portion of the allocated scatterlist to an iovec, suitable for
894 * kernel sockets to copy data in/out.
895 */
896 static int iscsit_map_iovec(
897 struct iscsi_cmd *cmd,
898 struct kvec *iov,
899 u32 data_offset,
900 u32 data_length)
901 {
902 u32 i = 0;
903 struct scatterlist *sg;
904 unsigned int page_off;
905
906 /*
907 * We know each entry in t_data_sg contains a page.
908 */
909 u32 ent = data_offset / PAGE_SIZE;
910
911 if (ent >= cmd->se_cmd.t_data_nents) {
912 pr_err("Initial page entry out-of-bounds\n");
913 return -1;
914 }
915
916 sg = &cmd->se_cmd.t_data_sg[ent];
917 page_off = (data_offset % PAGE_SIZE);
918
919 cmd->first_data_sg = sg;
920 cmd->first_data_sg_off = page_off;
921
922 while (data_length) {
923 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
924
925 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
926 iov[i].iov_len = cur_len;
927
928 data_length -= cur_len;
929 page_off = 0;
930 sg = sg_next(sg);
931 i++;
932 }
933
934 cmd->kmapped_nents = i;
935
936 return i;
937 }
938
939 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
940 {
941 u32 i;
942 struct scatterlist *sg;
943
944 sg = cmd->first_data_sg;
945
946 for (i = 0; i < cmd->kmapped_nents; i++)
947 kunmap(sg_page(&sg[i]));
948 }
949
950 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
951 {
952 LIST_HEAD(ack_list);
953 struct iscsi_cmd *cmd, *cmd_p;
954
955 conn->exp_statsn = exp_statsn;
956
957 if (conn->sess->sess_ops->RDMAExtensions)
958 return;
959
960 spin_lock_bh(&conn->cmd_lock);
961 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
962 spin_lock(&cmd->istate_lock);
963 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
964 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
965 cmd->i_state = ISTATE_REMOVE;
966 spin_unlock(&cmd->istate_lock);
967 list_move_tail(&cmd->i_conn_node, &ack_list);
968 continue;
969 }
970 spin_unlock(&cmd->istate_lock);
971 }
972 spin_unlock_bh(&conn->cmd_lock);
973
974 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
975 list_del_init(&cmd->i_conn_node);
976 iscsit_free_cmd(cmd, false);
977 }
978 }
979
980 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
981 {
982 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
983
984 iov_count += ISCSI_IOV_DATA_BUFFER;
985
986 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
987 if (!cmd->iov_data) {
988 pr_err("Unable to allocate cmd->iov_data\n");
989 return -ENOMEM;
990 }
991
992 cmd->orig_iov_data_count = iov_count;
993 return 0;
994 }
995
996 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
997 unsigned char *buf)
998 {
999 int data_direction, payload_length;
1000 struct iscsi_scsi_req *hdr;
1001 int iscsi_task_attr;
1002 int sam_task_attr;
1003
1004 atomic_long_inc(&conn->sess->cmd_pdus);
1005
1006 hdr = (struct iscsi_scsi_req *) buf;
1007 payload_length = ntoh24(hdr->dlength);
1008
1009 /* FIXME; Add checks for AdditionalHeaderSegment */
1010
1011 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1012 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1013 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1014 " not set. Bad iSCSI Initiator.\n");
1015 return iscsit_add_reject_cmd(cmd,
1016 ISCSI_REASON_BOOKMARK_INVALID, buf);
1017 }
1018
1019 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1020 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1021 /*
1022 * From RFC-3720 Section 10.3.1:
1023 *
1024 * "Either or both of R and W MAY be 1 when either the
1025 * Expected Data Transfer Length and/or Bidirectional Read
1026 * Expected Data Transfer Length are 0"
1027 *
1028 * For this case, go ahead and clear the unnecssary bits
1029 * to avoid any confusion with ->data_direction.
1030 */
1031 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1032 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1033
1034 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1035 " set when Expected Data Transfer Length is 0 for"
1036 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1037 }
1038
1039 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1040 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1041 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1042 " MUST be set if Expected Data Transfer Length is not 0."
1043 " Bad iSCSI Initiator\n");
1044 return iscsit_add_reject_cmd(cmd,
1045 ISCSI_REASON_BOOKMARK_INVALID, buf);
1046 }
1047
1048 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1049 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1050 pr_err("Bidirectional operations not supported!\n");
1051 return iscsit_add_reject_cmd(cmd,
1052 ISCSI_REASON_BOOKMARK_INVALID, buf);
1053 }
1054
1055 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1056 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1057 " Scsi Command PDU.\n");
1058 return iscsit_add_reject_cmd(cmd,
1059 ISCSI_REASON_BOOKMARK_INVALID, buf);
1060 }
1061
1062 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1063 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1064 " protocol error.\n", payload_length);
1065 return iscsit_add_reject_cmd(cmd,
1066 ISCSI_REASON_PROTOCOL_ERROR, buf);
1067 }
1068
1069 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1070 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1071 pr_err("Expected Data Transfer Length and Length of"
1072 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1073 " bit is not set protocol error\n");
1074 return iscsit_add_reject_cmd(cmd,
1075 ISCSI_REASON_PROTOCOL_ERROR, buf);
1076 }
1077
1078 if (payload_length > be32_to_cpu(hdr->data_length)) {
1079 pr_err("DataSegmentLength: %u is greater than"
1080 " EDTL: %u, protocol error.\n", payload_length,
1081 hdr->data_length);
1082 return iscsit_add_reject_cmd(cmd,
1083 ISCSI_REASON_PROTOCOL_ERROR, buf);
1084 }
1085
1086 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1087 pr_err("DataSegmentLength: %u is greater than"
1088 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1089 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1090 return iscsit_add_reject_cmd(cmd,
1091 ISCSI_REASON_PROTOCOL_ERROR, buf);
1092 }
1093
1094 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1095 pr_err("DataSegmentLength: %u is greater than"
1096 " FirstBurstLength: %u, protocol error.\n",
1097 payload_length, conn->sess->sess_ops->FirstBurstLength);
1098 return iscsit_add_reject_cmd(cmd,
1099 ISCSI_REASON_BOOKMARK_INVALID, buf);
1100 }
1101
1102 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1103 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1104 DMA_NONE;
1105
1106 cmd->data_direction = data_direction;
1107 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1108 /*
1109 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1110 */
1111 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1112 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1113 sam_task_attr = TCM_SIMPLE_TAG;
1114 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1115 sam_task_attr = TCM_ORDERED_TAG;
1116 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1117 sam_task_attr = TCM_HEAD_TAG;
1118 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1119 sam_task_attr = TCM_ACA_TAG;
1120 else {
1121 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1122 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1123 sam_task_attr = TCM_SIMPLE_TAG;
1124 }
1125
1126 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1127 cmd->i_state = ISTATE_NEW_CMD;
1128 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1129 cmd->immediate_data = (payload_length) ? 1 : 0;
1130 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1131 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1132 if (cmd->unsolicited_data)
1133 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1134
1135 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1136 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1137 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1138 else
1139 cmd->targ_xfer_tag = 0xFFFFFFFF;
1140 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1141 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1142 cmd->first_burst_len = payload_length;
1143
1144 if (!conn->sess->sess_ops->RDMAExtensions &&
1145 cmd->data_direction == DMA_FROM_DEVICE) {
1146 struct iscsi_datain_req *dr;
1147
1148 dr = iscsit_allocate_datain_req();
1149 if (!dr)
1150 return iscsit_add_reject_cmd(cmd,
1151 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1152
1153 iscsit_attach_datain_req(cmd, dr);
1154 }
1155
1156 /*
1157 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1158 */
1159 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1160 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1161 cmd->data_direction, sam_task_attr,
1162 cmd->sense_buffer + 2);
1163
1164 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1165 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1166 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1167 conn->cid);
1168
1169 target_get_sess_cmd(&cmd->se_cmd, true);
1170
1171 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1172 scsilun_to_int(&hdr->lun));
1173 if (cmd->sense_reason)
1174 goto attach_cmd;
1175
1176 /* only used for printks or comparing with ->ref_task_tag */
1177 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1178 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1179 if (cmd->sense_reason) {
1180 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1181 return iscsit_add_reject_cmd(cmd,
1182 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1183 }
1184
1185 goto attach_cmd;
1186 }
1187
1188 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1189 return iscsit_add_reject_cmd(cmd,
1190 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1191 }
1192
1193 attach_cmd:
1194 spin_lock_bh(&conn->cmd_lock);
1195 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1196 spin_unlock_bh(&conn->cmd_lock);
1197 /*
1198 * Check if we need to delay processing because of ALUA
1199 * Active/NonOptimized primary access state..
1200 */
1201 core_alua_check_nonop_delay(&cmd->se_cmd);
1202
1203 return 0;
1204 }
1205 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1206
1207 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1208 {
1209 iscsit_set_dataout_sequence_values(cmd);
1210
1211 spin_lock_bh(&cmd->dataout_timeout_lock);
1212 iscsit_start_dataout_timer(cmd, cmd->conn);
1213 spin_unlock_bh(&cmd->dataout_timeout_lock);
1214 }
1215 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1216
1217 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1218 struct iscsi_scsi_req *hdr)
1219 {
1220 int cmdsn_ret = 0;
1221 /*
1222 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1223 * the Immediate Bit is not set, and no Immediate
1224 * Data is attached.
1225 *
1226 * A PDU/CmdSN carrying Immediate Data can only
1227 * be processed after the DataCRC has passed.
1228 * If the DataCRC fails, the CmdSN MUST NOT
1229 * be acknowledged. (See below)
1230 */
1231 if (!cmd->immediate_data) {
1232 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1233 (unsigned char *)hdr, hdr->cmdsn);
1234 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1235 return -1;
1236 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1237 target_put_sess_cmd(&cmd->se_cmd);
1238 return 0;
1239 }
1240 }
1241
1242 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1243
1244 /*
1245 * If no Immediate Data is attached, it's OK to return now.
1246 */
1247 if (!cmd->immediate_data) {
1248 if (!cmd->sense_reason && cmd->unsolicited_data)
1249 iscsit_set_unsoliticed_dataout(cmd);
1250 if (!cmd->sense_reason)
1251 return 0;
1252
1253 target_put_sess_cmd(&cmd->se_cmd);
1254 return 0;
1255 }
1256
1257 /*
1258 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1259 * execution. These exceptions are processed in CmdSN order using
1260 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1261 */
1262 if (cmd->sense_reason) {
1263 if (cmd->reject_reason)
1264 return 0;
1265
1266 return 1;
1267 }
1268 /*
1269 * Call directly into transport_generic_new_cmd() to perform
1270 * the backend memory allocation.
1271 */
1272 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1273 if (cmd->sense_reason)
1274 return 1;
1275
1276 return 0;
1277 }
1278 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1279
1280 static int
1281 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1282 bool dump_payload)
1283 {
1284 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1285 /*
1286 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1287 */
1288 if (dump_payload)
1289 goto after_immediate_data;
1290
1291 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1292 cmd->first_burst_len);
1293 after_immediate_data:
1294 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1295 /*
1296 * A PDU/CmdSN carrying Immediate Data passed
1297 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1298 * Immediate Bit is not set.
1299 */
1300 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1301 (unsigned char *)hdr, hdr->cmdsn);
1302 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1303 return -1;
1304
1305 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1306 int rc;
1307
1308 rc = iscsit_dump_data_payload(cmd->conn,
1309 cmd->first_burst_len, 1);
1310 target_put_sess_cmd(&cmd->se_cmd);
1311 return rc;
1312 } else if (cmd->unsolicited_data)
1313 iscsit_set_unsoliticed_dataout(cmd);
1314
1315 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1316 /*
1317 * Immediate Data failed DataCRC and ERL>=1,
1318 * silently drop this PDU and let the initiator
1319 * plug the CmdSN gap.
1320 *
1321 * FIXME: Send Unsolicited NOPIN with reserved
1322 * TTT here to help the initiator figure out
1323 * the missing CmdSN, although they should be
1324 * intelligent enough to determine the missing
1325 * CmdSN and issue a retry to plug the sequence.
1326 */
1327 cmd->i_state = ISTATE_REMOVE;
1328 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1329 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1330 return -1;
1331
1332 return 0;
1333 }
1334
1335 static int
1336 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1337 unsigned char *buf)
1338 {
1339 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1340 int rc, immed_data;
1341 bool dump_payload = false;
1342
1343 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1344 if (rc < 0)
1345 return 0;
1346 /*
1347 * Allocation iovecs needed for struct socket operations for
1348 * traditional iSCSI block I/O.
1349 */
1350 if (iscsit_allocate_iovecs(cmd) < 0) {
1351 return iscsit_reject_cmd(cmd,
1352 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1353 }
1354 immed_data = cmd->immediate_data;
1355
1356 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1357 if (rc < 0)
1358 return rc;
1359 else if (rc > 0)
1360 dump_payload = true;
1361
1362 if (!immed_data)
1363 return 0;
1364
1365 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1366 }
1367
1368 static u32 iscsit_do_crypto_hash_sg(
1369 struct ahash_request *hash,
1370 struct iscsi_cmd *cmd,
1371 u32 data_offset,
1372 u32 data_length,
1373 u32 padding,
1374 u8 *pad_bytes)
1375 {
1376 u32 data_crc;
1377 struct scatterlist *sg;
1378 unsigned int page_off;
1379
1380 crypto_ahash_init(hash);
1381
1382 sg = cmd->first_data_sg;
1383 page_off = cmd->first_data_sg_off;
1384
1385 while (data_length) {
1386 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1387
1388 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1389 crypto_ahash_update(hash);
1390
1391 data_length -= cur_len;
1392 page_off = 0;
1393 /* iscsit_map_iovec has already checked for invalid sg pointers */
1394 sg = sg_next(sg);
1395 }
1396
1397 if (padding) {
1398 struct scatterlist pad_sg;
1399
1400 sg_init_one(&pad_sg, pad_bytes, padding);
1401 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1402 padding);
1403 crypto_ahash_finup(hash);
1404 } else {
1405 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1406 crypto_ahash_final(hash);
1407 }
1408
1409 return data_crc;
1410 }
1411
1412 static void iscsit_do_crypto_hash_buf(
1413 struct ahash_request *hash,
1414 const void *buf,
1415 u32 payload_length,
1416 u32 padding,
1417 u8 *pad_bytes,
1418 u8 *data_crc)
1419 {
1420 struct scatterlist sg[2];
1421
1422 sg_init_table(sg, ARRAY_SIZE(sg));
1423 sg_set_buf(sg, buf, payload_length);
1424 sg_set_buf(sg + 1, pad_bytes, padding);
1425
1426 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1427
1428 crypto_ahash_digest(hash);
1429 }
1430
1431 int
1432 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1433 struct iscsi_cmd **out_cmd)
1434 {
1435 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1436 struct iscsi_cmd *cmd = NULL;
1437 struct se_cmd *se_cmd;
1438 u32 payload_length = ntoh24(hdr->dlength);
1439 int rc;
1440
1441 if (!payload_length) {
1442 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1443 return 0;
1444 }
1445
1446 /* iSCSI write */
1447 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1448
1449 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1450 pr_err("DataSegmentLength: %u is greater than"
1451 " MaxXmitDataSegmentLength: %u\n", payload_length,
1452 conn->conn_ops->MaxXmitDataSegmentLength);
1453 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1454 buf);
1455 }
1456
1457 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1458 payload_length);
1459 if (!cmd)
1460 return 0;
1461
1462 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1463 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1464 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1465 payload_length, conn->cid);
1466
1467 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1468 pr_err("Command ITT: 0x%08x received DataOUT after"
1469 " last DataOUT received, dumping payload\n",
1470 cmd->init_task_tag);
1471 return iscsit_dump_data_payload(conn, payload_length, 1);
1472 }
1473
1474 if (cmd->data_direction != DMA_TO_DEVICE) {
1475 pr_err("Command ITT: 0x%08x received DataOUT for a"
1476 " NON-WRITE command.\n", cmd->init_task_tag);
1477 return iscsit_dump_data_payload(conn, payload_length, 1);
1478 }
1479 se_cmd = &cmd->se_cmd;
1480 iscsit_mod_dataout_timer(cmd);
1481
1482 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1483 pr_err("DataOut Offset: %u, Length %u greater than"
1484 " iSCSI Command EDTL %u, protocol error.\n",
1485 hdr->offset, payload_length, cmd->se_cmd.data_length);
1486 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1487 }
1488
1489 if (cmd->unsolicited_data) {
1490 int dump_unsolicited_data = 0;
1491
1492 if (conn->sess->sess_ops->InitialR2T) {
1493 pr_err("Received unexpected unsolicited data"
1494 " while InitialR2T=Yes, protocol error.\n");
1495 transport_send_check_condition_and_sense(&cmd->se_cmd,
1496 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1497 return -1;
1498 }
1499 /*
1500 * Special case for dealing with Unsolicited DataOUT
1501 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1502 * failures;
1503 */
1504
1505 /* Something's amiss if we're not in WRITE_PENDING state... */
1506 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1507 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1508 dump_unsolicited_data = 1;
1509
1510 if (dump_unsolicited_data) {
1511 /*
1512 * Check if a delayed TASK_ABORTED status needs to
1513 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1514 * received with the unsolicited data out.
1515 */
1516 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1517 iscsit_stop_dataout_timer(cmd);
1518
1519 transport_check_aborted_status(se_cmd,
1520 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1521 return iscsit_dump_data_payload(conn, payload_length, 1);
1522 }
1523 } else {
1524 /*
1525 * For the normal solicited data path:
1526 *
1527 * Check for a delayed TASK_ABORTED status and dump any
1528 * incoming data out payload if one exists. Also, when the
1529 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1530 * data out sequence, we decrement outstanding_r2ts. Once
1531 * outstanding_r2ts reaches zero, go ahead and send the delayed
1532 * TASK_ABORTED status.
1533 */
1534 if (se_cmd->transport_state & CMD_T_ABORTED) {
1535 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1536 if (--cmd->outstanding_r2ts < 1) {
1537 iscsit_stop_dataout_timer(cmd);
1538 transport_check_aborted_status(
1539 se_cmd, 1);
1540 }
1541
1542 return iscsit_dump_data_payload(conn, payload_length, 1);
1543 }
1544 }
1545 /*
1546 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1547 * within-command recovery checks before receiving the payload.
1548 */
1549 rc = iscsit_check_pre_dataout(cmd, buf);
1550 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1551 return 0;
1552 else if (rc == DATAOUT_CANNOT_RECOVER)
1553 return -1;
1554
1555 *out_cmd = cmd;
1556 return 0;
1557 }
1558 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1559
1560 static int
1561 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1562 struct iscsi_data *hdr)
1563 {
1564 struct kvec *iov;
1565 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1566 u32 payload_length = ntoh24(hdr->dlength);
1567 int iov_ret, data_crc_failed = 0;
1568
1569 rx_size += payload_length;
1570 iov = &cmd->iov_data[0];
1571
1572 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1573 payload_length);
1574 if (iov_ret < 0)
1575 return -1;
1576
1577 iov_count += iov_ret;
1578
1579 padding = ((-payload_length) & 3);
1580 if (padding != 0) {
1581 iov[iov_count].iov_base = cmd->pad_bytes;
1582 iov[iov_count++].iov_len = padding;
1583 rx_size += padding;
1584 pr_debug("Receiving %u padding bytes.\n", padding);
1585 }
1586
1587 if (conn->conn_ops->DataDigest) {
1588 iov[iov_count].iov_base = &checksum;
1589 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1590 rx_size += ISCSI_CRC_LEN;
1591 }
1592
1593 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1594
1595 iscsit_unmap_iovec(cmd);
1596
1597 if (rx_got != rx_size)
1598 return -1;
1599
1600 if (conn->conn_ops->DataDigest) {
1601 u32 data_crc;
1602
1603 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1604 be32_to_cpu(hdr->offset),
1605 payload_length, padding,
1606 cmd->pad_bytes);
1607
1608 if (checksum != data_crc) {
1609 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1610 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1611 " does not match computed 0x%08x\n",
1612 hdr->itt, hdr->offset, payload_length,
1613 hdr->datasn, checksum, data_crc);
1614 data_crc_failed = 1;
1615 } else {
1616 pr_debug("Got CRC32C DataDigest 0x%08x for"
1617 " %u bytes of Data Out\n", checksum,
1618 payload_length);
1619 }
1620 }
1621
1622 return data_crc_failed;
1623 }
1624
1625 int
1626 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1627 bool data_crc_failed)
1628 {
1629 struct iscsi_conn *conn = cmd->conn;
1630 int rc, ooo_cmdsn;
1631 /*
1632 * Increment post receive data and CRC values or perform
1633 * within-command recovery.
1634 */
1635 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1636 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1637 return 0;
1638 else if (rc == DATAOUT_SEND_R2T) {
1639 iscsit_set_dataout_sequence_values(cmd);
1640 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1641 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1642 /*
1643 * Handle extra special case for out of order
1644 * Unsolicited Data Out.
1645 */
1646 spin_lock_bh(&cmd->istate_lock);
1647 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1648 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1649 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1650 spin_unlock_bh(&cmd->istate_lock);
1651
1652 iscsit_stop_dataout_timer(cmd);
1653 if (ooo_cmdsn)
1654 return 0;
1655 target_execute_cmd(&cmd->se_cmd);
1656 return 0;
1657 } else /* DATAOUT_CANNOT_RECOVER */
1658 return -1;
1659
1660 return 0;
1661 }
1662 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1663
1664 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1665 {
1666 struct iscsi_cmd *cmd = NULL;
1667 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1668 int rc;
1669 bool data_crc_failed = false;
1670
1671 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1672 if (rc < 0)
1673 return 0;
1674 else if (!cmd)
1675 return 0;
1676
1677 rc = iscsit_get_dataout(conn, cmd, hdr);
1678 if (rc < 0)
1679 return rc;
1680 else if (rc > 0)
1681 data_crc_failed = true;
1682
1683 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1684 }
1685
1686 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1687 struct iscsi_nopout *hdr)
1688 {
1689 u32 payload_length = ntoh24(hdr->dlength);
1690
1691 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1692 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1693 if (!cmd)
1694 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1695 (unsigned char *)hdr);
1696
1697 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1698 (unsigned char *)hdr);
1699 }
1700
1701 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1702 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1703 " not set, protocol error.\n");
1704 if (!cmd)
1705 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1706 (unsigned char *)hdr);
1707
1708 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1709 (unsigned char *)hdr);
1710 }
1711
1712 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1713 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1714 " greater than MaxXmitDataSegmentLength: %u, protocol"
1715 " error.\n", payload_length,
1716 conn->conn_ops->MaxXmitDataSegmentLength);
1717 if (!cmd)
1718 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1719 (unsigned char *)hdr);
1720
1721 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1722 (unsigned char *)hdr);
1723 }
1724
1725 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1726 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1727 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1728 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1729 payload_length);
1730 /*
1731 * This is not a response to a Unsolicited NopIN, which means
1732 * it can either be a NOPOUT ping request (with a valid ITT),
1733 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1734 * Either way, make sure we allocate an struct iscsi_cmd, as both
1735 * can contain ping data.
1736 */
1737 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1738 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1739 cmd->i_state = ISTATE_SEND_NOPIN;
1740 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1741 1 : 0);
1742 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1743 cmd->targ_xfer_tag = 0xFFFFFFFF;
1744 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1745 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1746 cmd->data_direction = DMA_NONE;
1747 }
1748
1749 return 0;
1750 }
1751 EXPORT_SYMBOL(iscsit_setup_nop_out);
1752
1753 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1754 struct iscsi_nopout *hdr)
1755 {
1756 struct iscsi_cmd *cmd_p = NULL;
1757 int cmdsn_ret = 0;
1758 /*
1759 * Initiator is expecting a NopIN ping reply..
1760 */
1761 if (hdr->itt != RESERVED_ITT) {
1762 if (!cmd)
1763 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1764 (unsigned char *)hdr);
1765
1766 spin_lock_bh(&conn->cmd_lock);
1767 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1768 spin_unlock_bh(&conn->cmd_lock);
1769
1770 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1771
1772 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1773 iscsit_add_cmd_to_response_queue(cmd, conn,
1774 cmd->i_state);
1775 return 0;
1776 }
1777
1778 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1779 (unsigned char *)hdr, hdr->cmdsn);
1780 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1781 return 0;
1782 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1783 return -1;
1784
1785 return 0;
1786 }
1787 /*
1788 * This was a response to a unsolicited NOPIN ping.
1789 */
1790 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1791 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1792 if (!cmd_p)
1793 return -EINVAL;
1794
1795 iscsit_stop_nopin_response_timer(conn);
1796
1797 cmd_p->i_state = ISTATE_REMOVE;
1798 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1799
1800 iscsit_start_nopin_timer(conn);
1801 return 0;
1802 }
1803 /*
1804 * Otherwise, initiator is not expecting a NOPIN is response.
1805 * Just ignore for now.
1806 */
1807 return 0;
1808 }
1809 EXPORT_SYMBOL(iscsit_process_nop_out);
1810
1811 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1812 unsigned char *buf)
1813 {
1814 unsigned char *ping_data = NULL;
1815 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1816 struct kvec *iov = NULL;
1817 u32 payload_length = ntoh24(hdr->dlength);
1818 int ret;
1819
1820 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1821 if (ret < 0)
1822 return 0;
1823 /*
1824 * Handle NOP-OUT payload for traditional iSCSI sockets
1825 */
1826 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1827 u32 checksum, data_crc, padding = 0;
1828 int niov = 0, rx_got, rx_size = payload_length;
1829
1830 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1831 if (!ping_data) {
1832 pr_err("Unable to allocate memory for"
1833 " NOPOUT ping data.\n");
1834 ret = -1;
1835 goto out;
1836 }
1837
1838 iov = &cmd->iov_misc[0];
1839 iov[niov].iov_base = ping_data;
1840 iov[niov++].iov_len = payload_length;
1841
1842 padding = ((-payload_length) & 3);
1843 if (padding != 0) {
1844 pr_debug("Receiving %u additional bytes"
1845 " for padding.\n", padding);
1846 iov[niov].iov_base = &cmd->pad_bytes;
1847 iov[niov++].iov_len = padding;
1848 rx_size += padding;
1849 }
1850 if (conn->conn_ops->DataDigest) {
1851 iov[niov].iov_base = &checksum;
1852 iov[niov++].iov_len = ISCSI_CRC_LEN;
1853 rx_size += ISCSI_CRC_LEN;
1854 }
1855
1856 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1857 if (rx_got != rx_size) {
1858 ret = -1;
1859 goto out;
1860 }
1861
1862 if (conn->conn_ops->DataDigest) {
1863 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1864 ping_data, payload_length,
1865 padding, cmd->pad_bytes,
1866 (u8 *)&data_crc);
1867
1868 if (checksum != data_crc) {
1869 pr_err("Ping data CRC32C DataDigest"
1870 " 0x%08x does not match computed 0x%08x\n",
1871 checksum, data_crc);
1872 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1873 pr_err("Unable to recover from"
1874 " NOPOUT Ping DataCRC failure while in"
1875 " ERL=0.\n");
1876 ret = -1;
1877 goto out;
1878 } else {
1879 /*
1880 * Silently drop this PDU and let the
1881 * initiator plug the CmdSN gap.
1882 */
1883 pr_debug("Dropping NOPOUT"
1884 " Command CmdSN: 0x%08x due to"
1885 " DataCRC error.\n", hdr->cmdsn);
1886 ret = 0;
1887 goto out;
1888 }
1889 } else {
1890 pr_debug("Got CRC32C DataDigest"
1891 " 0x%08x for %u bytes of ping data.\n",
1892 checksum, payload_length);
1893 }
1894 }
1895
1896 ping_data[payload_length] = '\0';
1897 /*
1898 * Attach ping data to struct iscsi_cmd->buf_ptr.
1899 */
1900 cmd->buf_ptr = ping_data;
1901 cmd->buf_ptr_size = payload_length;
1902
1903 pr_debug("Got %u bytes of NOPOUT ping"
1904 " data.\n", payload_length);
1905 pr_debug("Ping Data: \"%s\"\n", ping_data);
1906 }
1907
1908 return iscsit_process_nop_out(conn, cmd, hdr);
1909 out:
1910 if (cmd)
1911 iscsit_free_cmd(cmd, false);
1912
1913 kfree(ping_data);
1914 return ret;
1915 }
1916
1917 int
1918 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1919 unsigned char *buf)
1920 {
1921 struct se_tmr_req *se_tmr;
1922 struct iscsi_tmr_req *tmr_req;
1923 struct iscsi_tm *hdr;
1924 int out_of_order_cmdsn = 0, ret;
1925 bool sess_ref = false;
1926 u8 function;
1927
1928 hdr = (struct iscsi_tm *) buf;
1929 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1930 function = hdr->flags;
1931
1932 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1933 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1934 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1935 hdr->rtt, hdr->refcmdsn, conn->cid);
1936
1937 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1938 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1939 hdr->rtt != RESERVED_ITT)) {
1940 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1941 hdr->rtt = RESERVED_ITT;
1942 }
1943
1944 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1945 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1946 pr_err("Task Management Request TASK_REASSIGN not"
1947 " issued as immediate command, bad iSCSI Initiator"
1948 "implementation\n");
1949 return iscsit_add_reject_cmd(cmd,
1950 ISCSI_REASON_PROTOCOL_ERROR, buf);
1951 }
1952 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1953 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1954 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1955
1956 cmd->data_direction = DMA_NONE;
1957
1958 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1959 if (!cmd->tmr_req) {
1960 pr_err("Unable to allocate memory for"
1961 " Task Management command!\n");
1962 return iscsit_add_reject_cmd(cmd,
1963 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1964 buf);
1965 }
1966
1967 /*
1968 * TASK_REASSIGN for ERL=2 / connection stays inside of
1969 * LIO-Target $FABRIC_MOD
1970 */
1971 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1972
1973 u8 tcm_function;
1974 int ret;
1975
1976 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1977 conn->sess->se_sess, 0, DMA_NONE,
1978 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1979
1980 target_get_sess_cmd(&cmd->se_cmd, true);
1981 sess_ref = true;
1982
1983 switch (function) {
1984 case ISCSI_TM_FUNC_ABORT_TASK:
1985 tcm_function = TMR_ABORT_TASK;
1986 break;
1987 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1988 tcm_function = TMR_ABORT_TASK_SET;
1989 break;
1990 case ISCSI_TM_FUNC_CLEAR_ACA:
1991 tcm_function = TMR_CLEAR_ACA;
1992 break;
1993 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1994 tcm_function = TMR_CLEAR_TASK_SET;
1995 break;
1996 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1997 tcm_function = TMR_LUN_RESET;
1998 break;
1999 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2000 tcm_function = TMR_TARGET_WARM_RESET;
2001 break;
2002 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2003 tcm_function = TMR_TARGET_COLD_RESET;
2004 break;
2005 default:
2006 pr_err("Unknown iSCSI TMR Function:"
2007 " 0x%02x\n", function);
2008 return iscsit_add_reject_cmd(cmd,
2009 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2010 }
2011
2012 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
2013 tcm_function, GFP_KERNEL);
2014 if (ret < 0)
2015 return iscsit_add_reject_cmd(cmd,
2016 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2017
2018 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2019 }
2020
2021 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2022 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2023 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2024 cmd->init_task_tag = hdr->itt;
2025 cmd->targ_xfer_tag = 0xFFFFFFFF;
2026 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2027 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2028 se_tmr = cmd->se_cmd.se_tmr_req;
2029 tmr_req = cmd->tmr_req;
2030 /*
2031 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2032 */
2033 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2034 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2035 scsilun_to_int(&hdr->lun));
2036 if (ret < 0) {
2037 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2038 goto attach;
2039 }
2040 }
2041
2042 switch (function) {
2043 case ISCSI_TM_FUNC_ABORT_TASK:
2044 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2045 if (se_tmr->response)
2046 goto attach;
2047 break;
2048 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2049 case ISCSI_TM_FUNC_CLEAR_ACA:
2050 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2051 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2052 break;
2053 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2054 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2055 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2056 goto attach;
2057 }
2058 break;
2059 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2060 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2061 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2062 goto attach;
2063 }
2064 break;
2065 case ISCSI_TM_FUNC_TASK_REASSIGN:
2066 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2067 /*
2068 * Perform sanity checks on the ExpDataSN only if the
2069 * TASK_REASSIGN was successful.
2070 */
2071 if (se_tmr->response)
2072 break;
2073
2074 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2075 return iscsit_add_reject_cmd(cmd,
2076 ISCSI_REASON_BOOKMARK_INVALID, buf);
2077 break;
2078 default:
2079 pr_err("Unknown TMR function: 0x%02x, protocol"
2080 " error.\n", function);
2081 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2082 goto attach;
2083 }
2084
2085 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2086 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2087 se_tmr->call_transport = 1;
2088 attach:
2089 spin_lock_bh(&conn->cmd_lock);
2090 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2091 spin_unlock_bh(&conn->cmd_lock);
2092
2093 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2094 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2095 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
2096 out_of_order_cmdsn = 1;
2097 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2098 return 0;
2099 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2100 return -1;
2101 }
2102 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2103
2104 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2105 return 0;
2106 /*
2107 * Found the referenced task, send to transport for processing.
2108 */
2109 if (se_tmr->call_transport)
2110 return transport_generic_handle_tmr(&cmd->se_cmd);
2111
2112 /*
2113 * Could not find the referenced LUN, task, or Task Management
2114 * command not authorized or supported. Change state and
2115 * let the tx_thread send the response.
2116 *
2117 * For connection recovery, this is also the default action for
2118 * TMR TASK_REASSIGN.
2119 */
2120 if (sess_ref) {
2121 pr_debug("Handle TMR, using sess_ref=true check\n");
2122 target_put_sess_cmd(&cmd->se_cmd);
2123 }
2124
2125 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2126 return 0;
2127 }
2128 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2129
2130 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2131 int
2132 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2133 struct iscsi_text *hdr)
2134 {
2135 u32 payload_length = ntoh24(hdr->dlength);
2136
2137 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2138 pr_err("Unable to accept text parameter length: %u"
2139 "greater than MaxXmitDataSegmentLength %u.\n",
2140 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2141 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2142 (unsigned char *)hdr);
2143 }
2144
2145 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2146 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2147 pr_err("Multi sequence text commands currently not supported\n");
2148 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2149 (unsigned char *)hdr);
2150 }
2151
2152 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2153 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2154 hdr->exp_statsn, payload_length);
2155
2156 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2157 cmd->i_state = ISTATE_SEND_TEXTRSP;
2158 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2159 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2160 cmd->targ_xfer_tag = 0xFFFFFFFF;
2161 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2162 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2163 cmd->data_direction = DMA_NONE;
2164 cmd->text_in_ptr = NULL;
2165
2166 return 0;
2167 }
2168 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2169
2170 int
2171 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2172 struct iscsi_text *hdr)
2173 {
2174 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2175 int cmdsn_ret;
2176
2177 if (!text_in) {
2178 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2179 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2180 pr_err("Unable to locate text_in buffer for sendtargets"
2181 " discovery\n");
2182 goto reject;
2183 }
2184 goto empty_sendtargets;
2185 }
2186 if (strncmp("SendTargets", text_in, 11) != 0) {
2187 pr_err("Received Text Data that is not"
2188 " SendTargets, cannot continue.\n");
2189 goto reject;
2190 }
2191 text_ptr = strchr(text_in, '=');
2192 if (!text_ptr) {
2193 pr_err("No \"=\" separator found in Text Data,"
2194 " cannot continue.\n");
2195 goto reject;
2196 }
2197 if (!strncmp("=All", text_ptr, 4)) {
2198 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2199 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2200 !strncmp("=eui.", text_ptr, 5)) {
2201 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2202 } else {
2203 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2204 goto reject;
2205 }
2206
2207 spin_lock_bh(&conn->cmd_lock);
2208 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2209 spin_unlock_bh(&conn->cmd_lock);
2210
2211 empty_sendtargets:
2212 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2213
2214 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2215 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2216 (unsigned char *)hdr, hdr->cmdsn);
2217 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2218 return -1;
2219
2220 return 0;
2221 }
2222
2223 return iscsit_execute_cmd(cmd, 0);
2224
2225 reject:
2226 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2227 (unsigned char *)hdr);
2228 }
2229 EXPORT_SYMBOL(iscsit_process_text_cmd);
2230
2231 static int
2232 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2233 unsigned char *buf)
2234 {
2235 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2236 char *text_in = NULL;
2237 u32 payload_length = ntoh24(hdr->dlength);
2238 int rx_size, rc;
2239
2240 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2241 if (rc < 0)
2242 return 0;
2243
2244 rx_size = payload_length;
2245 if (payload_length) {
2246 u32 checksum = 0, data_crc = 0;
2247 u32 padding = 0, pad_bytes = 0;
2248 int niov = 0, rx_got;
2249 struct kvec iov[3];
2250
2251 text_in = kzalloc(payload_length, GFP_KERNEL);
2252 if (!text_in) {
2253 pr_err("Unable to allocate memory for"
2254 " incoming text parameters\n");
2255 goto reject;
2256 }
2257 cmd->text_in_ptr = text_in;
2258
2259 memset(iov, 0, 3 * sizeof(struct kvec));
2260 iov[niov].iov_base = text_in;
2261 iov[niov++].iov_len = payload_length;
2262
2263 padding = ((-payload_length) & 3);
2264 if (padding != 0) {
2265 iov[niov].iov_base = &pad_bytes;
2266 iov[niov++].iov_len = padding;
2267 rx_size += padding;
2268 pr_debug("Receiving %u additional bytes"
2269 " for padding.\n", padding);
2270 }
2271 if (conn->conn_ops->DataDigest) {
2272 iov[niov].iov_base = &checksum;
2273 iov[niov++].iov_len = ISCSI_CRC_LEN;
2274 rx_size += ISCSI_CRC_LEN;
2275 }
2276
2277 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2278 if (rx_got != rx_size)
2279 goto reject;
2280
2281 if (conn->conn_ops->DataDigest) {
2282 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2283 text_in, payload_length,
2284 padding, (u8 *)&pad_bytes,
2285 (u8 *)&data_crc);
2286
2287 if (checksum != data_crc) {
2288 pr_err("Text data CRC32C DataDigest"
2289 " 0x%08x does not match computed"
2290 " 0x%08x\n", checksum, data_crc);
2291 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2292 pr_err("Unable to recover from"
2293 " Text Data digest failure while in"
2294 " ERL=0.\n");
2295 goto reject;
2296 } else {
2297 /*
2298 * Silently drop this PDU and let the
2299 * initiator plug the CmdSN gap.
2300 */
2301 pr_debug("Dropping Text"
2302 " Command CmdSN: 0x%08x due to"
2303 " DataCRC error.\n", hdr->cmdsn);
2304 kfree(text_in);
2305 return 0;
2306 }
2307 } else {
2308 pr_debug("Got CRC32C DataDigest"
2309 " 0x%08x for %u bytes of text data.\n",
2310 checksum, payload_length);
2311 }
2312 }
2313 text_in[payload_length - 1] = '\0';
2314 pr_debug("Successfully read %d bytes of text"
2315 " data.\n", payload_length);
2316 }
2317
2318 return iscsit_process_text_cmd(conn, cmd, hdr);
2319
2320 reject:
2321 kfree(cmd->text_in_ptr);
2322 cmd->text_in_ptr = NULL;
2323 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2324 }
2325
2326 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2327 {
2328 struct iscsi_conn *conn_p;
2329 struct iscsi_session *sess = conn->sess;
2330
2331 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2332 " for SID: %u.\n", conn->cid, conn->sess->sid);
2333
2334 atomic_set(&sess->session_logout, 1);
2335 atomic_set(&conn->conn_logout_remove, 1);
2336 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2337
2338 iscsit_inc_conn_usage_count(conn);
2339 iscsit_inc_session_usage_count(sess);
2340
2341 spin_lock_bh(&sess->conn_lock);
2342 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2343 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2344 continue;
2345
2346 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2347 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2348 }
2349 spin_unlock_bh(&sess->conn_lock);
2350
2351 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2352
2353 return 0;
2354 }
2355
2356 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2357 {
2358 struct iscsi_conn *l_conn;
2359 struct iscsi_session *sess = conn->sess;
2360
2361 pr_debug("Received logout request CLOSECONNECTION for CID:"
2362 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2363
2364 /*
2365 * A Logout Request with a CLOSECONNECTION reason code for a CID
2366 * can arrive on a connection with a differing CID.
2367 */
2368 if (conn->cid == cmd->logout_cid) {
2369 spin_lock_bh(&conn->state_lock);
2370 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2371 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2372
2373 atomic_set(&conn->conn_logout_remove, 1);
2374 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2375 iscsit_inc_conn_usage_count(conn);
2376
2377 spin_unlock_bh(&conn->state_lock);
2378 } else {
2379 /*
2380 * Handle all different cid CLOSECONNECTION requests in
2381 * iscsit_logout_post_handler_diffcid() as to give enough
2382 * time for any non immediate command's CmdSN to be
2383 * acknowledged on the connection in question.
2384 *
2385 * Here we simply make sure the CID is still around.
2386 */
2387 l_conn = iscsit_get_conn_from_cid(sess,
2388 cmd->logout_cid);
2389 if (!l_conn) {
2390 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2391 iscsit_add_cmd_to_response_queue(cmd, conn,
2392 cmd->i_state);
2393 return 0;
2394 }
2395
2396 iscsit_dec_conn_usage_count(l_conn);
2397 }
2398
2399 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2400
2401 return 0;
2402 }
2403
2404 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2405 {
2406 struct iscsi_session *sess = conn->sess;
2407
2408 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2409 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2410
2411 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2412 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2413 " while ERL!=2.\n");
2414 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2415 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2416 return 0;
2417 }
2418
2419 if (conn->cid == cmd->logout_cid) {
2420 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2421 " with CID: %hu on CID: %hu, implementation error.\n",
2422 cmd->logout_cid, conn->cid);
2423 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2424 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2425 return 0;
2426 }
2427
2428 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2429
2430 return 0;
2431 }
2432
2433 int
2434 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2435 unsigned char *buf)
2436 {
2437 int cmdsn_ret, logout_remove = 0;
2438 u8 reason_code = 0;
2439 struct iscsi_logout *hdr;
2440 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2441
2442 hdr = (struct iscsi_logout *) buf;
2443 reason_code = (hdr->flags & 0x7f);
2444
2445 if (tiqn) {
2446 spin_lock(&tiqn->logout_stats.lock);
2447 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2448 tiqn->logout_stats.normal_logouts++;
2449 else
2450 tiqn->logout_stats.abnormal_logouts++;
2451 spin_unlock(&tiqn->logout_stats.lock);
2452 }
2453
2454 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2455 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2456 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2457 hdr->cid, conn->cid);
2458
2459 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2460 pr_err("Received logout request on connection that"
2461 " is not in logged in state, ignoring request.\n");
2462 iscsit_free_cmd(cmd, false);
2463 return 0;
2464 }
2465
2466 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2467 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2468 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2469 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2470 cmd->targ_xfer_tag = 0xFFFFFFFF;
2471 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2472 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2473 cmd->logout_cid = be16_to_cpu(hdr->cid);
2474 cmd->logout_reason = reason_code;
2475 cmd->data_direction = DMA_NONE;
2476
2477 /*
2478 * We need to sleep in these cases (by returning 1) until the Logout
2479 * Response gets sent in the tx thread.
2480 */
2481 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2482 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2483 be16_to_cpu(hdr->cid) == conn->cid))
2484 logout_remove = 1;
2485
2486 spin_lock_bh(&conn->cmd_lock);
2487 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2488 spin_unlock_bh(&conn->cmd_lock);
2489
2490 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2491 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2492
2493 /*
2494 * Immediate commands are executed, well, immediately.
2495 * Non-Immediate Logout Commands are executed in CmdSN order.
2496 */
2497 if (cmd->immediate_cmd) {
2498 int ret = iscsit_execute_cmd(cmd, 0);
2499
2500 if (ret < 0)
2501 return ret;
2502 } else {
2503 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2504 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2505 logout_remove = 0;
2506 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2507 return -1;
2508 }
2509
2510 return logout_remove;
2511 }
2512 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2513
2514 int iscsit_handle_snack(
2515 struct iscsi_conn *conn,
2516 unsigned char *buf)
2517 {
2518 struct iscsi_snack *hdr;
2519
2520 hdr = (struct iscsi_snack *) buf;
2521 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2522
2523 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2524 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2525 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2526 hdr->begrun, hdr->runlength, conn->cid);
2527
2528 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2529 pr_err("Initiator sent SNACK request while in"
2530 " ErrorRecoveryLevel=0.\n");
2531 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2532 buf);
2533 }
2534 /*
2535 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2536 * call from inside iscsi_send_recovery_datain_or_r2t().
2537 */
2538 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2539 case 0:
2540 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2541 hdr->itt,
2542 be32_to_cpu(hdr->ttt),
2543 be32_to_cpu(hdr->begrun),
2544 be32_to_cpu(hdr->runlength));
2545 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2546 return iscsit_handle_status_snack(conn, hdr->itt,
2547 be32_to_cpu(hdr->ttt),
2548 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2549 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2550 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2551 be32_to_cpu(hdr->begrun),
2552 be32_to_cpu(hdr->runlength));
2553 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2554 /* FIXME: Support R-Data SNACK */
2555 pr_err("R-Data SNACK Not Supported.\n");
2556 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2557 buf);
2558 default:
2559 pr_err("Unknown SNACK type 0x%02x, protocol"
2560 " error.\n", hdr->flags & 0x0f);
2561 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2562 buf);
2563 }
2564
2565 return 0;
2566 }
2567 EXPORT_SYMBOL(iscsit_handle_snack);
2568
2569 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2570 {
2571 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2572 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2573 wait_for_completion_interruptible_timeout(
2574 &conn->rx_half_close_comp,
2575 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2576 }
2577 }
2578
2579 static int iscsit_handle_immediate_data(
2580 struct iscsi_cmd *cmd,
2581 struct iscsi_scsi_req *hdr,
2582 u32 length)
2583 {
2584 int iov_ret, rx_got = 0, rx_size = 0;
2585 u32 checksum, iov_count = 0, padding = 0;
2586 struct iscsi_conn *conn = cmd->conn;
2587 struct kvec *iov;
2588
2589 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2590 if (iov_ret < 0)
2591 return IMMEDIATE_DATA_CANNOT_RECOVER;
2592
2593 rx_size = length;
2594 iov_count = iov_ret;
2595 iov = &cmd->iov_data[0];
2596
2597 padding = ((-length) & 3);
2598 if (padding != 0) {
2599 iov[iov_count].iov_base = cmd->pad_bytes;
2600 iov[iov_count++].iov_len = padding;
2601 rx_size += padding;
2602 }
2603
2604 if (conn->conn_ops->DataDigest) {
2605 iov[iov_count].iov_base = &checksum;
2606 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2607 rx_size += ISCSI_CRC_LEN;
2608 }
2609
2610 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2611
2612 iscsit_unmap_iovec(cmd);
2613
2614 if (rx_got != rx_size) {
2615 iscsit_rx_thread_wait_for_tcp(conn);
2616 return IMMEDIATE_DATA_CANNOT_RECOVER;
2617 }
2618
2619 if (conn->conn_ops->DataDigest) {
2620 u32 data_crc;
2621
2622 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2623 cmd->write_data_done, length, padding,
2624 cmd->pad_bytes);
2625
2626 if (checksum != data_crc) {
2627 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2628 " does not match computed 0x%08x\n", checksum,
2629 data_crc);
2630
2631 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2632 pr_err("Unable to recover from"
2633 " Immediate Data digest failure while"
2634 " in ERL=0.\n");
2635 iscsit_reject_cmd(cmd,
2636 ISCSI_REASON_DATA_DIGEST_ERROR,
2637 (unsigned char *)hdr);
2638 return IMMEDIATE_DATA_CANNOT_RECOVER;
2639 } else {
2640 iscsit_reject_cmd(cmd,
2641 ISCSI_REASON_DATA_DIGEST_ERROR,
2642 (unsigned char *)hdr);
2643 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2644 }
2645 } else {
2646 pr_debug("Got CRC32C DataDigest 0x%08x for"
2647 " %u bytes of Immediate Data\n", checksum,
2648 length);
2649 }
2650 }
2651
2652 cmd->write_data_done += length;
2653
2654 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2655 spin_lock_bh(&cmd->istate_lock);
2656 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2657 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2658 spin_unlock_bh(&cmd->istate_lock);
2659 }
2660
2661 return IMMEDIATE_DATA_NORMAL_OPERATION;
2662 }
2663
2664 /*
2665 * Called with sess->conn_lock held.
2666 */
2667 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2668 with active network interface */
2669 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2670 {
2671 struct iscsi_cmd *cmd;
2672 struct iscsi_conn *conn_p;
2673 bool found = false;
2674
2675 /*
2676 * Only send a Asynchronous Message on connections whos network
2677 * interface is still functional.
2678 */
2679 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2680 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2681 iscsit_inc_conn_usage_count(conn_p);
2682 found = true;
2683 break;
2684 }
2685 }
2686
2687 if (!found)
2688 return;
2689
2690 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2691 if (!cmd) {
2692 iscsit_dec_conn_usage_count(conn_p);
2693 return;
2694 }
2695
2696 cmd->logout_cid = conn->cid;
2697 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2698 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2699
2700 spin_lock_bh(&conn_p->cmd_lock);
2701 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2702 spin_unlock_bh(&conn_p->cmd_lock);
2703
2704 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2705 iscsit_dec_conn_usage_count(conn_p);
2706 }
2707
2708 static int iscsit_send_conn_drop_async_message(
2709 struct iscsi_cmd *cmd,
2710 struct iscsi_conn *conn)
2711 {
2712 struct iscsi_async *hdr;
2713
2714 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2715
2716 hdr = (struct iscsi_async *) cmd->pdu;
2717 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2718 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2719 cmd->init_task_tag = RESERVED_ITT;
2720 cmd->targ_xfer_tag = 0xFFFFFFFF;
2721 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2722 cmd->stat_sn = conn->stat_sn++;
2723 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2724 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2725 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2726 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2727 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2728 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2729 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2730
2731 pr_debug("Sending Connection Dropped Async Message StatSN:"
2732 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2733 cmd->logout_cid, conn->cid);
2734
2735 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2736 }
2737
2738 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2739 {
2740 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2741 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2742 wait_for_completion_interruptible_timeout(
2743 &conn->tx_half_close_comp,
2744 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2745 }
2746 }
2747
2748 void
2749 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2750 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2751 bool set_statsn)
2752 {
2753 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2754 hdr->flags = datain->flags;
2755 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2756 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2757 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2758 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2759 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2760 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2761 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2762 }
2763 }
2764 hton24(hdr->dlength, datain->length);
2765 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2766 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2767 (struct scsi_lun *)&hdr->lun);
2768 else
2769 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2770
2771 hdr->itt = cmd->init_task_tag;
2772
2773 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2774 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2775 else
2776 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2777 if (set_statsn)
2778 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2779 else
2780 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2781
2782 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2783 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2784 hdr->datasn = cpu_to_be32(datain->data_sn);
2785 hdr->offset = cpu_to_be32(datain->offset);
2786
2787 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2788 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2789 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2790 ntohl(hdr->offset), datain->length, conn->cid);
2791 }
2792 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2793
2794 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2795 {
2796 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2797 struct iscsi_datain datain;
2798 struct iscsi_datain_req *dr;
2799 int eodr = 0, ret;
2800 bool set_statsn = false;
2801
2802 memset(&datain, 0, sizeof(struct iscsi_datain));
2803 dr = iscsit_get_datain_values(cmd, &datain);
2804 if (!dr) {
2805 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2806 cmd->init_task_tag);
2807 return -1;
2808 }
2809 /*
2810 * Be paranoid and double check the logic for now.
2811 */
2812 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2813 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2814 " datain.length: %u exceeds cmd->data_length: %u\n",
2815 cmd->init_task_tag, datain.offset, datain.length,
2816 cmd->se_cmd.data_length);
2817 return -1;
2818 }
2819
2820 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2821 /*
2822 * Special case for successfully execution w/ both DATAIN
2823 * and Sense Data.
2824 */
2825 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2826 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2827 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2828 else {
2829 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2830 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2831 iscsit_increment_maxcmdsn(cmd, conn->sess);
2832 cmd->stat_sn = conn->stat_sn++;
2833 set_statsn = true;
2834 } else if (dr->dr_complete ==
2835 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2836 set_statsn = true;
2837 }
2838
2839 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2840
2841 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2842 if (ret < 0)
2843 return ret;
2844
2845 if (dr->dr_complete) {
2846 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2847 2 : 1;
2848 iscsit_free_datain_req(cmd, dr);
2849 }
2850
2851 return eodr;
2852 }
2853
2854 int
2855 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2856 struct iscsi_logout_rsp *hdr)
2857 {
2858 struct iscsi_conn *logout_conn = NULL;
2859 struct iscsi_conn_recovery *cr = NULL;
2860 struct iscsi_session *sess = conn->sess;
2861 /*
2862 * The actual shutting down of Sessions and/or Connections
2863 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2864 * is done in scsi_logout_post_handler().
2865 */
2866 switch (cmd->logout_reason) {
2867 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2868 pr_debug("iSCSI session logout successful, setting"
2869 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2870 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2871 break;
2872 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2873 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2874 break;
2875 /*
2876 * For CLOSECONNECTION logout requests carrying
2877 * a matching logout CID -> local CID, the reference
2878 * for the local CID will have been incremented in
2879 * iscsi_logout_closeconnection().
2880 *
2881 * For CLOSECONNECTION logout requests carrying
2882 * a different CID than the connection it arrived
2883 * on, the connection responding to cmd->logout_cid
2884 * is stopped in iscsit_logout_post_handler_diffcid().
2885 */
2886
2887 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2888 " successful.\n", cmd->logout_cid, conn->cid);
2889 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2890 break;
2891 case ISCSI_LOGOUT_REASON_RECOVERY:
2892 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2893 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2894 break;
2895 /*
2896 * If the connection is still active from our point of view
2897 * force connection recovery to occur.
2898 */
2899 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2900 cmd->logout_cid);
2901 if (logout_conn) {
2902 iscsit_connection_reinstatement_rcfr(logout_conn);
2903 iscsit_dec_conn_usage_count(logout_conn);
2904 }
2905
2906 cr = iscsit_get_inactive_connection_recovery_entry(
2907 conn->sess, cmd->logout_cid);
2908 if (!cr) {
2909 pr_err("Unable to locate CID: %hu for"
2910 " REMOVECONNFORRECOVERY Logout Request.\n",
2911 cmd->logout_cid);
2912 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2913 break;
2914 }
2915
2916 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2917
2918 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2919 " for recovery for CID: %hu on CID: %hu successful.\n",
2920 cmd->logout_cid, conn->cid);
2921 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2922 break;
2923 default:
2924 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2925 cmd->logout_reason);
2926 return -1;
2927 }
2928
2929 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2930 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2931 hdr->response = cmd->logout_response;
2932 hdr->itt = cmd->init_task_tag;
2933 cmd->stat_sn = conn->stat_sn++;
2934 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2935
2936 iscsit_increment_maxcmdsn(cmd, conn->sess);
2937 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2938 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2939
2940 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2941 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2942 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2943 cmd->logout_cid, conn->cid);
2944
2945 return 0;
2946 }
2947 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2948
2949 static int
2950 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2951 {
2952 int rc;
2953
2954 rc = iscsit_build_logout_rsp(cmd, conn,
2955 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2956 if (rc < 0)
2957 return rc;
2958
2959 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2960 }
2961
2962 void
2963 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2964 struct iscsi_nopin *hdr, bool nopout_response)
2965 {
2966 hdr->opcode = ISCSI_OP_NOOP_IN;
2967 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2968 hton24(hdr->dlength, cmd->buf_ptr_size);
2969 if (nopout_response)
2970 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2971 hdr->itt = cmd->init_task_tag;
2972 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2973 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2974 conn->stat_sn;
2975 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2976
2977 if (nopout_response)
2978 iscsit_increment_maxcmdsn(cmd, conn->sess);
2979
2980 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2981 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2982
2983 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2984 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2985 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2986 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2987 }
2988 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2989
2990 /*
2991 * Unsolicited NOPIN, either requesting a response or not.
2992 */
2993 static int iscsit_send_unsolicited_nopin(
2994 struct iscsi_cmd *cmd,
2995 struct iscsi_conn *conn,
2996 int want_response)
2997 {
2998 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2999 int ret;
3000
3001 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3002
3003 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3004 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3005
3006 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3007 if (ret < 0)
3008 return ret;
3009
3010 spin_lock_bh(&cmd->istate_lock);
3011 cmd->i_state = want_response ?
3012 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3013 spin_unlock_bh(&cmd->istate_lock);
3014
3015 return 0;
3016 }
3017
3018 static int
3019 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3020 {
3021 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3022
3023 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3024
3025 /*
3026 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3027 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3028 */
3029 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3030
3031 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3032 cmd->buf_ptr,
3033 cmd->buf_ptr_size);
3034 }
3035
3036 static int iscsit_send_r2t(
3037 struct iscsi_cmd *cmd,
3038 struct iscsi_conn *conn)
3039 {
3040 struct iscsi_r2t *r2t;
3041 struct iscsi_r2t_rsp *hdr;
3042 int ret;
3043
3044 r2t = iscsit_get_r2t_from_list(cmd);
3045 if (!r2t)
3046 return -1;
3047
3048 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3049 memset(hdr, 0, ISCSI_HDR_LEN);
3050 hdr->opcode = ISCSI_OP_R2T;
3051 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3052 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3053 (struct scsi_lun *)&hdr->lun);
3054 hdr->itt = cmd->init_task_tag;
3055 if (conn->conn_transport->iscsit_get_r2t_ttt)
3056 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3057 else
3058 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3059 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3060 hdr->statsn = cpu_to_be32(conn->stat_sn);
3061 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3062 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3063 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3064 hdr->data_offset = cpu_to_be32(r2t->offset);
3065 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3066
3067 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3068 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3069 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3070 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3071 r2t->offset, r2t->xfer_len, conn->cid);
3072
3073 spin_lock_bh(&cmd->r2t_lock);
3074 r2t->sent_r2t = 1;
3075 spin_unlock_bh(&cmd->r2t_lock);
3076
3077 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3078 if (ret < 0) {
3079 return ret;
3080 }
3081
3082 spin_lock_bh(&cmd->dataout_timeout_lock);
3083 iscsit_start_dataout_timer(cmd, conn);
3084 spin_unlock_bh(&cmd->dataout_timeout_lock);
3085
3086 return 0;
3087 }
3088
3089 /*
3090 * @recovery: If called from iscsi_task_reassign_complete_write() for
3091 * connection recovery.
3092 */
3093 int iscsit_build_r2ts_for_cmd(
3094 struct iscsi_conn *conn,
3095 struct iscsi_cmd *cmd,
3096 bool recovery)
3097 {
3098 int first_r2t = 1;
3099 u32 offset = 0, xfer_len = 0;
3100
3101 spin_lock_bh(&cmd->r2t_lock);
3102 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3103 spin_unlock_bh(&cmd->r2t_lock);
3104 return 0;
3105 }
3106
3107 if (conn->sess->sess_ops->DataSequenceInOrder &&
3108 !recovery)
3109 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3110
3111 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3112 if (conn->sess->sess_ops->DataSequenceInOrder) {
3113 offset = cmd->r2t_offset;
3114
3115 if (first_r2t && recovery) {
3116 int new_data_end = offset +
3117 conn->sess->sess_ops->MaxBurstLength -
3118 cmd->next_burst_len;
3119
3120 if (new_data_end > cmd->se_cmd.data_length)
3121 xfer_len = cmd->se_cmd.data_length - offset;
3122 else
3123 xfer_len =
3124 conn->sess->sess_ops->MaxBurstLength -
3125 cmd->next_burst_len;
3126 } else {
3127 int new_data_end = offset +
3128 conn->sess->sess_ops->MaxBurstLength;
3129
3130 if (new_data_end > cmd->se_cmd.data_length)
3131 xfer_len = cmd->se_cmd.data_length - offset;
3132 else
3133 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3134 }
3135 cmd->r2t_offset += xfer_len;
3136
3137 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3138 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3139 } else {
3140 struct iscsi_seq *seq;
3141
3142 seq = iscsit_get_seq_holder_for_r2t(cmd);
3143 if (!seq) {
3144 spin_unlock_bh(&cmd->r2t_lock);
3145 return -1;
3146 }
3147
3148 offset = seq->offset;
3149 xfer_len = seq->xfer_len;
3150
3151 if (cmd->seq_send_order == cmd->seq_count)
3152 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3153 }
3154 cmd->outstanding_r2ts++;
3155 first_r2t = 0;
3156
3157 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3158 spin_unlock_bh(&cmd->r2t_lock);
3159 return -1;
3160 }
3161
3162 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3163 break;
3164 }
3165 spin_unlock_bh(&cmd->r2t_lock);
3166
3167 return 0;
3168 }
3169 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3170
3171 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3172 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3173 {
3174 if (inc_stat_sn)
3175 cmd->stat_sn = conn->stat_sn++;
3176
3177 atomic_long_inc(&conn->sess->rsp_pdus);
3178
3179 memset(hdr, 0, ISCSI_HDR_LEN);
3180 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3181 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3182 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3183 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3184 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3185 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3186 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3187 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3188 }
3189 hdr->response = cmd->iscsi_response;
3190 hdr->cmd_status = cmd->se_cmd.scsi_status;
3191 hdr->itt = cmd->init_task_tag;
3192 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3193
3194 iscsit_increment_maxcmdsn(cmd, conn->sess);
3195 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3196 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3197
3198 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3199 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3200 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3201 cmd->se_cmd.scsi_status, conn->cid);
3202 }
3203 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3204
3205 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3206 {
3207 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3208 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3209 void *data_buf = NULL;
3210 u32 padding = 0, data_buf_len = 0;
3211
3212 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3213
3214 /*
3215 * Attach SENSE DATA payload to iSCSI Response PDU
3216 */
3217 if (cmd->se_cmd.sense_buffer &&
3218 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3219 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3220 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3221 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3222
3223 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3224 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3225 data_buf = cmd->sense_buffer;
3226 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3227
3228 if (padding) {
3229 memset(cmd->sense_buffer +
3230 cmd->se_cmd.scsi_sense_length, 0, padding);
3231 pr_debug("Adding %u bytes of padding to"
3232 " SENSE.\n", padding);
3233 }
3234
3235 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3236 " Response PDU\n",
3237 cmd->se_cmd.scsi_sense_length);
3238 }
3239
3240 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3241 data_buf_len);
3242 }
3243
3244 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3245 {
3246 switch (se_tmr->response) {
3247 case TMR_FUNCTION_COMPLETE:
3248 return ISCSI_TMF_RSP_COMPLETE;
3249 case TMR_TASK_DOES_NOT_EXIST:
3250 return ISCSI_TMF_RSP_NO_TASK;
3251 case TMR_LUN_DOES_NOT_EXIST:
3252 return ISCSI_TMF_RSP_NO_LUN;
3253 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3254 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3255 case TMR_FUNCTION_REJECTED:
3256 default:
3257 return ISCSI_TMF_RSP_REJECTED;
3258 }
3259 }
3260
3261 void
3262 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3263 struct iscsi_tm_rsp *hdr)
3264 {
3265 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3266
3267 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3268 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3269 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3270 hdr->itt = cmd->init_task_tag;
3271 cmd->stat_sn = conn->stat_sn++;
3272 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3273
3274 iscsit_increment_maxcmdsn(cmd, conn->sess);
3275 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3276 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3277
3278 pr_debug("Built Task Management Response ITT: 0x%08x,"
3279 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3280 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3281 }
3282 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3283
3284 static int
3285 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3286 {
3287 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3288
3289 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3290
3291 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3292 }
3293
3294 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3295 {
3296 bool ret = false;
3297
3298 if (np->np_sockaddr.ss_family == AF_INET6) {
3299 const struct sockaddr_in6 sin6 = {
3300 .sin6_addr = IN6ADDR_ANY_INIT };
3301 struct sockaddr_in6 *sock_in6 =
3302 (struct sockaddr_in6 *)&np->np_sockaddr;
3303
3304 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3305 sin6.sin6_addr.s6_addr, 16))
3306 ret = true;
3307 } else {
3308 struct sockaddr_in * sock_in =
3309 (struct sockaddr_in *)&np->np_sockaddr;
3310
3311 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3312 ret = true;
3313 }
3314
3315 return ret;
3316 }
3317
3318 #define SENDTARGETS_BUF_LIMIT 32768U
3319
3320 static int
3321 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3322 enum iscsit_transport_type network_transport,
3323 int skip_bytes, bool *completed)
3324 {
3325 char *payload = NULL;
3326 struct iscsi_conn *conn = cmd->conn;
3327 struct iscsi_portal_group *tpg;
3328 struct iscsi_tiqn *tiqn;
3329 struct iscsi_tpg_np *tpg_np;
3330 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3331 int target_name_printed;
3332 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3333 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3334 bool active;
3335
3336 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3337 SENDTARGETS_BUF_LIMIT);
3338
3339 payload = kzalloc(buffer_len, GFP_KERNEL);
3340 if (!payload) {
3341 pr_err("Unable to allocate memory for sendtargets"
3342 " response.\n");
3343 return -ENOMEM;
3344 }
3345 /*
3346 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3347 * explicit case..
3348 */
3349 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3350 text_ptr = strchr(text_in, '=');
3351 if (!text_ptr) {
3352 pr_err("Unable to locate '=' string in text_in:"
3353 " %s\n", text_in);
3354 kfree(payload);
3355 return -EINVAL;
3356 }
3357 /*
3358 * Skip over '=' character..
3359 */
3360 text_ptr += 1;
3361 }
3362
3363 spin_lock(&tiqn_lock);
3364 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3365 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3366 strcmp(tiqn->tiqn, text_ptr)) {
3367 continue;
3368 }
3369
3370 target_name_printed = 0;
3371
3372 spin_lock(&tiqn->tiqn_tpg_lock);
3373 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3374
3375 /* If demo_mode_discovery=0 and generate_node_acls=0
3376 * (demo mode dislabed) do not return
3377 * TargetName+TargetAddress unless a NodeACL exists.
3378 */
3379
3380 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3381 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3382 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3383 cmd->conn->sess->sess_ops->InitiatorName))) {
3384 continue;
3385 }
3386
3387 spin_lock(&tpg->tpg_state_lock);
3388 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3389 spin_unlock(&tpg->tpg_state_lock);
3390
3391 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3392 continue;
3393
3394 spin_lock(&tpg->tpg_np_lock);
3395 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3396 tpg_np_list) {
3397 struct iscsi_np *np = tpg_np->tpg_np;
3398 bool inaddr_any = iscsit_check_inaddr_any(np);
3399 struct sockaddr_storage *sockaddr;
3400
3401 if (np->np_network_transport != network_transport)
3402 continue;
3403
3404 if (!target_name_printed) {
3405 len = sprintf(buf, "TargetName=%s",
3406 tiqn->tiqn);
3407 len += 1;
3408
3409 if ((len + payload_len) > buffer_len) {
3410 spin_unlock(&tpg->tpg_np_lock);
3411 spin_unlock(&tiqn->tiqn_tpg_lock);
3412 end_of_buf = 1;
3413 goto eob;
3414 }
3415
3416 if (skip_bytes && len <= skip_bytes) {
3417 skip_bytes -= len;
3418 } else {
3419 memcpy(payload + payload_len, buf, len);
3420 payload_len += len;
3421 target_name_printed = 1;
3422 if (len > skip_bytes)
3423 skip_bytes = 0;
3424 }
3425 }
3426
3427 if (inaddr_any)
3428 sockaddr = &conn->local_sockaddr;
3429 else
3430 sockaddr = &np->np_sockaddr;
3431
3432 len = sprintf(buf, "TargetAddress="
3433 "%pISpc,%hu",
3434 sockaddr,
3435 tpg->tpgt);
3436 len += 1;
3437
3438 if ((len + payload_len) > buffer_len) {
3439 spin_unlock(&tpg->tpg_np_lock);
3440 spin_unlock(&tiqn->tiqn_tpg_lock);
3441 end_of_buf = 1;
3442 goto eob;
3443 }
3444
3445 if (skip_bytes && len <= skip_bytes) {
3446 skip_bytes -= len;
3447 } else {
3448 memcpy(payload + payload_len, buf, len);
3449 payload_len += len;
3450 if (len > skip_bytes)
3451 skip_bytes = 0;
3452 }
3453 }
3454 spin_unlock(&tpg->tpg_np_lock);
3455 }
3456 spin_unlock(&tiqn->tiqn_tpg_lock);
3457 eob:
3458 if (end_of_buf) {
3459 *completed = false;
3460 break;
3461 }
3462
3463 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3464 break;
3465 }
3466 spin_unlock(&tiqn_lock);
3467
3468 cmd->buf_ptr = payload;
3469
3470 return payload_len;
3471 }
3472
3473 int
3474 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3475 struct iscsi_text_rsp *hdr,
3476 enum iscsit_transport_type network_transport)
3477 {
3478 int text_length, padding;
3479 bool completed = true;
3480
3481 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3482 cmd->read_data_done,
3483 &completed);
3484 if (text_length < 0)
3485 return text_length;
3486
3487 if (completed) {
3488 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3489 } else {
3490 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3491 cmd->read_data_done += text_length;
3492 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3493 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3494 }
3495 hdr->opcode = ISCSI_OP_TEXT_RSP;
3496 padding = ((-text_length) & 3);
3497 hton24(hdr->dlength, text_length);
3498 hdr->itt = cmd->init_task_tag;
3499 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3500 cmd->stat_sn = conn->stat_sn++;
3501 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3502
3503 iscsit_increment_maxcmdsn(cmd, conn->sess);
3504 /*
3505 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3506 * correctly increment MaxCmdSN for each response answering a
3507 * non immediate text request with a valid CmdSN.
3508 */
3509 cmd->maxcmdsn_inc = 0;
3510 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3511 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3512
3513 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3514 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3515 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3516 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3517 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3518
3519 return text_length + padding;
3520 }
3521 EXPORT_SYMBOL(iscsit_build_text_rsp);
3522
3523 static int iscsit_send_text_rsp(
3524 struct iscsi_cmd *cmd,
3525 struct iscsi_conn *conn)
3526 {
3527 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3528 int text_length;
3529
3530 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3531 conn->conn_transport->transport_type);
3532 if (text_length < 0)
3533 return text_length;
3534
3535 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3536 cmd->buf_ptr,
3537 text_length);
3538 }
3539
3540 void
3541 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3542 struct iscsi_reject *hdr)
3543 {
3544 hdr->opcode = ISCSI_OP_REJECT;
3545 hdr->reason = cmd->reject_reason;
3546 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3547 hton24(hdr->dlength, ISCSI_HDR_LEN);
3548 hdr->ffffffff = cpu_to_be32(0xffffffff);
3549 cmd->stat_sn = conn->stat_sn++;
3550 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3551 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3552 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3553
3554 }
3555 EXPORT_SYMBOL(iscsit_build_reject);
3556
3557 static int iscsit_send_reject(
3558 struct iscsi_cmd *cmd,
3559 struct iscsi_conn *conn)
3560 {
3561 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3562
3563 iscsit_build_reject(cmd, conn, hdr);
3564
3565 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3566 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3567
3568 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3569 cmd->buf_ptr,
3570 ISCSI_HDR_LEN);
3571 }
3572
3573 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3574 {
3575 int ord, cpu;
3576 /*
3577 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3578 * within iscsit_start_kthreads()
3579 *
3580 * Here we use bitmap_id to determine which CPU that this
3581 * iSCSI connection's RX/TX threads will be scheduled to
3582 * execute upon.
3583 */
3584 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3585 for_each_online_cpu(cpu) {
3586 if (ord-- == 0) {
3587 cpumask_set_cpu(cpu, conn->conn_cpumask);
3588 return;
3589 }
3590 }
3591 /*
3592 * This should never be reached..
3593 */
3594 dump_stack();
3595 cpumask_setall(conn->conn_cpumask);
3596 }
3597
3598 int
3599 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3600 {
3601 int ret;
3602
3603 switch (state) {
3604 case ISTATE_SEND_R2T:
3605 ret = iscsit_send_r2t(cmd, conn);
3606 if (ret < 0)
3607 goto err;
3608 break;
3609 case ISTATE_REMOVE:
3610 spin_lock_bh(&conn->cmd_lock);
3611 list_del_init(&cmd->i_conn_node);
3612 spin_unlock_bh(&conn->cmd_lock);
3613
3614 iscsit_free_cmd(cmd, false);
3615 break;
3616 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3617 iscsit_mod_nopin_response_timer(conn);
3618 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3619 if (ret < 0)
3620 goto err;
3621 break;
3622 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3623 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3624 if (ret < 0)
3625 goto err;
3626 break;
3627 default:
3628 pr_err("Unknown Opcode: 0x%02x ITT:"
3629 " 0x%08x, i_state: %d on CID: %hu\n",
3630 cmd->iscsi_opcode, cmd->init_task_tag, state,
3631 conn->cid);
3632 goto err;
3633 }
3634
3635 return 0;
3636
3637 err:
3638 return -1;
3639 }
3640 EXPORT_SYMBOL(iscsit_immediate_queue);
3641
3642 static int
3643 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3644 {
3645 struct iscsit_transport *t = conn->conn_transport;
3646 struct iscsi_queue_req *qr;
3647 struct iscsi_cmd *cmd;
3648 u8 state;
3649 int ret;
3650
3651 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3652 atomic_set(&conn->check_immediate_queue, 0);
3653 cmd = qr->cmd;
3654 state = qr->state;
3655 kmem_cache_free(lio_qr_cache, qr);
3656
3657 ret = t->iscsit_immediate_queue(conn, cmd, state);
3658 if (ret < 0)
3659 return ret;
3660 }
3661
3662 return 0;
3663 }
3664
3665 int
3666 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3667 {
3668 int ret;
3669
3670 check_rsp_state:
3671 switch (state) {
3672 case ISTATE_SEND_DATAIN:
3673 ret = iscsit_send_datain(cmd, conn);
3674 if (ret < 0)
3675 goto err;
3676 else if (!ret)
3677 /* more drs */
3678 goto check_rsp_state;
3679 else if (ret == 1) {
3680 /* all done */
3681 spin_lock_bh(&cmd->istate_lock);
3682 cmd->i_state = ISTATE_SENT_STATUS;
3683 spin_unlock_bh(&cmd->istate_lock);
3684
3685 if (atomic_read(&conn->check_immediate_queue))
3686 return 1;
3687
3688 return 0;
3689 } else if (ret == 2) {
3690 /* Still must send status,
3691 SCF_TRANSPORT_TASK_SENSE was set */
3692 spin_lock_bh(&cmd->istate_lock);
3693 cmd->i_state = ISTATE_SEND_STATUS;
3694 spin_unlock_bh(&cmd->istate_lock);
3695 state = ISTATE_SEND_STATUS;
3696 goto check_rsp_state;
3697 }
3698
3699 break;
3700 case ISTATE_SEND_STATUS:
3701 case ISTATE_SEND_STATUS_RECOVERY:
3702 ret = iscsit_send_response(cmd, conn);
3703 break;
3704 case ISTATE_SEND_LOGOUTRSP:
3705 ret = iscsit_send_logout(cmd, conn);
3706 break;
3707 case ISTATE_SEND_ASYNCMSG:
3708 ret = iscsit_send_conn_drop_async_message(
3709 cmd, conn);
3710 break;
3711 case ISTATE_SEND_NOPIN:
3712 ret = iscsit_send_nopin(cmd, conn);
3713 break;
3714 case ISTATE_SEND_REJECT:
3715 ret = iscsit_send_reject(cmd, conn);
3716 break;
3717 case ISTATE_SEND_TASKMGTRSP:
3718 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3719 if (ret != 0)
3720 break;
3721 ret = iscsit_tmr_post_handler(cmd, conn);
3722 if (ret != 0)
3723 iscsit_fall_back_to_erl0(conn->sess);
3724 break;
3725 case ISTATE_SEND_TEXTRSP:
3726 ret = iscsit_send_text_rsp(cmd, conn);
3727 break;
3728 default:
3729 pr_err("Unknown Opcode: 0x%02x ITT:"
3730 " 0x%08x, i_state: %d on CID: %hu\n",
3731 cmd->iscsi_opcode, cmd->init_task_tag,
3732 state, conn->cid);
3733 goto err;
3734 }
3735 if (ret < 0)
3736 goto err;
3737
3738 switch (state) {
3739 case ISTATE_SEND_LOGOUTRSP:
3740 if (!iscsit_logout_post_handler(cmd, conn))
3741 return -ECONNRESET;
3742 /* fall through */
3743 case ISTATE_SEND_STATUS:
3744 case ISTATE_SEND_ASYNCMSG:
3745 case ISTATE_SEND_NOPIN:
3746 case ISTATE_SEND_STATUS_RECOVERY:
3747 case ISTATE_SEND_TEXTRSP:
3748 case ISTATE_SEND_TASKMGTRSP:
3749 case ISTATE_SEND_REJECT:
3750 spin_lock_bh(&cmd->istate_lock);
3751 cmd->i_state = ISTATE_SENT_STATUS;
3752 spin_unlock_bh(&cmd->istate_lock);
3753 break;
3754 default:
3755 pr_err("Unknown Opcode: 0x%02x ITT:"
3756 " 0x%08x, i_state: %d on CID: %hu\n",
3757 cmd->iscsi_opcode, cmd->init_task_tag,
3758 cmd->i_state, conn->cid);
3759 goto err;
3760 }
3761
3762 if (atomic_read(&conn->check_immediate_queue))
3763 return 1;
3764
3765 return 0;
3766
3767 err:
3768 return -1;
3769 }
3770 EXPORT_SYMBOL(iscsit_response_queue);
3771
3772 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3773 {
3774 struct iscsit_transport *t = conn->conn_transport;
3775 struct iscsi_queue_req *qr;
3776 struct iscsi_cmd *cmd;
3777 u8 state;
3778 int ret;
3779
3780 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3781 cmd = qr->cmd;
3782 state = qr->state;
3783 kmem_cache_free(lio_qr_cache, qr);
3784
3785 ret = t->iscsit_response_queue(conn, cmd, state);
3786 if (ret == 1 || ret < 0)
3787 return ret;
3788 }
3789
3790 return 0;
3791 }
3792
3793 int iscsi_target_tx_thread(void *arg)
3794 {
3795 int ret = 0;
3796 struct iscsi_conn *conn = arg;
3797 /*
3798 * Allow ourselves to be interrupted by SIGINT so that a
3799 * connection recovery / failure event can be triggered externally.
3800 */
3801 allow_signal(SIGINT);
3802
3803 while (!kthread_should_stop()) {
3804 /*
3805 * Ensure that both TX and RX per connection kthreads
3806 * are scheduled to run on the same CPU.
3807 */
3808 iscsit_thread_check_cpumask(conn, current, 1);
3809
3810 wait_event_interruptible(conn->queues_wq,
3811 !iscsit_conn_all_queues_empty(conn));
3812
3813 if (signal_pending(current))
3814 goto transport_err;
3815
3816 get_immediate:
3817 ret = iscsit_handle_immediate_queue(conn);
3818 if (ret < 0)
3819 goto transport_err;
3820
3821 ret = iscsit_handle_response_queue(conn);
3822 if (ret == 1)
3823 goto get_immediate;
3824 else if (ret == -ECONNRESET)
3825 goto out;
3826 else if (ret < 0)
3827 goto transport_err;
3828 }
3829
3830 transport_err:
3831 /*
3832 * Avoid the normal connection failure code-path if this connection
3833 * is still within LOGIN mode, and iscsi_np process context is
3834 * responsible for cleaning up the early connection failure.
3835 */
3836 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3837 iscsit_take_action_for_connection_exit(conn);
3838 out:
3839 return 0;
3840 }
3841
3842 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3843 {
3844 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3845 struct iscsi_cmd *cmd;
3846 int ret = 0;
3847
3848 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3849 case ISCSI_OP_SCSI_CMD:
3850 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3851 if (!cmd)
3852 goto reject;
3853
3854 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3855 break;
3856 case ISCSI_OP_SCSI_DATA_OUT:
3857 ret = iscsit_handle_data_out(conn, buf);
3858 break;
3859 case ISCSI_OP_NOOP_OUT:
3860 cmd = NULL;
3861 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3862 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3863 if (!cmd)
3864 goto reject;
3865 }
3866 ret = iscsit_handle_nop_out(conn, cmd, buf);
3867 break;
3868 case ISCSI_OP_SCSI_TMFUNC:
3869 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3870 if (!cmd)
3871 goto reject;
3872
3873 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3874 break;
3875 case ISCSI_OP_TEXT:
3876 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3877 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3878 if (!cmd)
3879 goto reject;
3880 } else {
3881 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3882 if (!cmd)
3883 goto reject;
3884 }
3885
3886 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3887 break;
3888 case ISCSI_OP_LOGOUT:
3889 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3890 if (!cmd)
3891 goto reject;
3892
3893 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3894 if (ret > 0)
3895 wait_for_completion_timeout(&conn->conn_logout_comp,
3896 SECONDS_FOR_LOGOUT_COMP * HZ);
3897 break;
3898 case ISCSI_OP_SNACK:
3899 ret = iscsit_handle_snack(conn, buf);
3900 break;
3901 default:
3902 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3903 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3904 pr_err("Cannot recover from unknown"
3905 " opcode while ERL=0, closing iSCSI connection.\n");
3906 return -1;
3907 }
3908 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3909 " closing iSCSI connection.\n");
3910 ret = -1;
3911 break;
3912 }
3913
3914 return ret;
3915 reject:
3916 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3917 }
3918
3919 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3920 {
3921 bool ret;
3922
3923 spin_lock_bh(&conn->state_lock);
3924 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3925 spin_unlock_bh(&conn->state_lock);
3926
3927 return ret;
3928 }
3929
3930 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3931 {
3932 int ret;
3933 u8 buffer[ISCSI_HDR_LEN], opcode;
3934 u32 checksum = 0, digest = 0;
3935 struct kvec iov;
3936
3937 while (!kthread_should_stop()) {
3938 /*
3939 * Ensure that both TX and RX per connection kthreads
3940 * are scheduled to run on the same CPU.
3941 */
3942 iscsit_thread_check_cpumask(conn, current, 0);
3943
3944 memset(buffer, 0, ISCSI_HDR_LEN);
3945 memset(&iov, 0, sizeof(struct kvec));
3946
3947 iov.iov_base = buffer;
3948 iov.iov_len = ISCSI_HDR_LEN;
3949
3950 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3951 if (ret != ISCSI_HDR_LEN) {
3952 iscsit_rx_thread_wait_for_tcp(conn);
3953 return;
3954 }
3955
3956 if (conn->conn_ops->HeaderDigest) {
3957 iov.iov_base = &digest;
3958 iov.iov_len = ISCSI_CRC_LEN;
3959
3960 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3961 if (ret != ISCSI_CRC_LEN) {
3962 iscsit_rx_thread_wait_for_tcp(conn);
3963 return;
3964 }
3965
3966 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3967 buffer, ISCSI_HDR_LEN,
3968 0, NULL, (u8 *)&checksum);
3969
3970 if (digest != checksum) {
3971 pr_err("HeaderDigest CRC32C failed,"
3972 " received 0x%08x, computed 0x%08x\n",
3973 digest, checksum);
3974 /*
3975 * Set the PDU to 0xff so it will intentionally
3976 * hit default in the switch below.
3977 */
3978 memset(buffer, 0xff, ISCSI_HDR_LEN);
3979 atomic_long_inc(&conn->sess->conn_digest_errors);
3980 } else {
3981 pr_debug("Got HeaderDigest CRC32C"
3982 " 0x%08x\n", checksum);
3983 }
3984 }
3985
3986 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3987 return;
3988
3989 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3990
3991 if (conn->sess->sess_ops->SessionType &&
3992 ((!(opcode & ISCSI_OP_TEXT)) ||
3993 (!(opcode & ISCSI_OP_LOGOUT)))) {
3994 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3995 " while in Discovery Session, rejecting.\n", opcode);
3996 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
3997 buffer);
3998 return;
3999 }
4000
4001 ret = iscsi_target_rx_opcode(conn, buffer);
4002 if (ret < 0)
4003 return;
4004 }
4005 }
4006
4007 int iscsi_target_rx_thread(void *arg)
4008 {
4009 int rc;
4010 struct iscsi_conn *conn = arg;
4011
4012 /*
4013 * Allow ourselves to be interrupted by SIGINT so that a
4014 * connection recovery / failure event can be triggered externally.
4015 */
4016 allow_signal(SIGINT);
4017 /*
4018 * Wait for iscsi_post_login_handler() to complete before allowing
4019 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4020 */
4021 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4022 if (rc < 0 || iscsi_target_check_conn_state(conn))
4023 return 0;
4024
4025 if (!conn->conn_transport->iscsit_get_rx_pdu)
4026 return 0;
4027
4028 conn->conn_transport->iscsit_get_rx_pdu(conn);
4029
4030 if (!signal_pending(current))
4031 atomic_set(&conn->transport_failed, 1);
4032 iscsit_take_action_for_connection_exit(conn);
4033 return 0;
4034 }
4035
4036 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4037 {
4038 LIST_HEAD(tmp_list);
4039 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4040 struct iscsi_session *sess = conn->sess;
4041 /*
4042 * We expect this function to only ever be called from either RX or TX
4043 * thread context via iscsit_close_connection() once the other context
4044 * has been reset -> returned sleeping pre-handler state.
4045 */
4046 spin_lock_bh(&conn->cmd_lock);
4047 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4048
4049 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4050 struct se_cmd *se_cmd = &cmd->se_cmd;
4051
4052 if (se_cmd->se_tfo != NULL) {
4053 spin_lock(&se_cmd->t_state_lock);
4054 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4055 spin_unlock(&se_cmd->t_state_lock);
4056 }
4057 }
4058 spin_unlock_bh(&conn->cmd_lock);
4059
4060 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4061 list_del_init(&cmd->i_conn_node);
4062
4063 iscsit_increment_maxcmdsn(cmd, sess);
4064 iscsit_free_cmd(cmd, true);
4065
4066 }
4067 }
4068
4069 static void iscsit_stop_timers_for_cmds(
4070 struct iscsi_conn *conn)
4071 {
4072 struct iscsi_cmd *cmd;
4073
4074 spin_lock_bh(&conn->cmd_lock);
4075 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4076 if (cmd->data_direction == DMA_TO_DEVICE)
4077 iscsit_stop_dataout_timer(cmd);
4078 }
4079 spin_unlock_bh(&conn->cmd_lock);
4080 }
4081
4082 int iscsit_close_connection(
4083 struct iscsi_conn *conn)
4084 {
4085 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4086 struct iscsi_session *sess = conn->sess;
4087
4088 pr_debug("Closing iSCSI connection CID %hu on SID:"
4089 " %u\n", conn->cid, sess->sid);
4090 /*
4091 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4092 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4093 * sleeping and the logout response never got sent because the
4094 * connection failed.
4095 *
4096 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4097 * to signal logout response TX interrupt completion. Go ahead and skip
4098 * this for iser since isert_rx_opcode() does not wait on logout failure,
4099 * and to avoid iscsi_conn pointer dereference in iser-target code.
4100 */
4101 if (!conn->conn_transport->rdma_shutdown)
4102 complete(&conn->conn_logout_comp);
4103
4104 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4105 if (conn->tx_thread &&
4106 cmpxchg(&conn->tx_thread_active, true, false)) {
4107 send_sig(SIGINT, conn->tx_thread, 1);
4108 kthread_stop(conn->tx_thread);
4109 }
4110 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4111 if (conn->rx_thread &&
4112 cmpxchg(&conn->rx_thread_active, true, false)) {
4113 send_sig(SIGINT, conn->rx_thread, 1);
4114 kthread_stop(conn->rx_thread);
4115 }
4116 }
4117
4118 spin_lock(&iscsit_global->ts_bitmap_lock);
4119 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4120 get_order(1));
4121 spin_unlock(&iscsit_global->ts_bitmap_lock);
4122
4123 iscsit_stop_timers_for_cmds(conn);
4124 iscsit_stop_nopin_response_timer(conn);
4125 iscsit_stop_nopin_timer(conn);
4126
4127 if (conn->conn_transport->iscsit_wait_conn)
4128 conn->conn_transport->iscsit_wait_conn(conn);
4129
4130 /*
4131 * During Connection recovery drop unacknowledged out of order
4132 * commands for this connection, and prepare the other commands
4133 * for realligence.
4134 *
4135 * During normal operation clear the out of order commands (but
4136 * do not free the struct iscsi_ooo_cmdsn's) and release all
4137 * struct iscsi_cmds.
4138 */
4139 if (atomic_read(&conn->connection_recovery)) {
4140 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4141 iscsit_prepare_cmds_for_realligance(conn);
4142 } else {
4143 iscsit_clear_ooo_cmdsns_for_conn(conn);
4144 iscsit_release_commands_from_conn(conn);
4145 }
4146 iscsit_free_queue_reqs_for_conn(conn);
4147
4148 /*
4149 * Handle decrementing session or connection usage count if
4150 * a logout response was not able to be sent because the
4151 * connection failed. Fall back to Session Recovery here.
4152 */
4153 if (atomic_read(&conn->conn_logout_remove)) {
4154 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4155 iscsit_dec_conn_usage_count(conn);
4156 iscsit_dec_session_usage_count(sess);
4157 }
4158 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4159 iscsit_dec_conn_usage_count(conn);
4160
4161 atomic_set(&conn->conn_logout_remove, 0);
4162 atomic_set(&sess->session_reinstatement, 0);
4163 atomic_set(&sess->session_fall_back_to_erl0, 1);
4164 }
4165
4166 spin_lock_bh(&sess->conn_lock);
4167 list_del(&conn->conn_list);
4168
4169 /*
4170 * Attempt to let the Initiator know this connection failed by
4171 * sending an Connection Dropped Async Message on another
4172 * active connection.
4173 */
4174 if (atomic_read(&conn->connection_recovery))
4175 iscsit_build_conn_drop_async_message(conn);
4176
4177 spin_unlock_bh(&sess->conn_lock);
4178
4179 /*
4180 * If connection reinstatement is being performed on this connection,
4181 * up the connection reinstatement semaphore that is being blocked on
4182 * in iscsit_cause_connection_reinstatement().
4183 */
4184 spin_lock_bh(&conn->state_lock);
4185 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4186 spin_unlock_bh(&conn->state_lock);
4187 complete(&conn->conn_wait_comp);
4188 wait_for_completion(&conn->conn_post_wait_comp);
4189 spin_lock_bh(&conn->state_lock);
4190 }
4191
4192 /*
4193 * If connection reinstatement is being performed on this connection
4194 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4195 * connection wait rcfr semaphore that is being blocked on
4196 * an iscsit_connection_reinstatement_rcfr().
4197 */
4198 if (atomic_read(&conn->connection_wait_rcfr)) {
4199 spin_unlock_bh(&conn->state_lock);
4200 complete(&conn->conn_wait_rcfr_comp);
4201 wait_for_completion(&conn->conn_post_wait_comp);
4202 spin_lock_bh(&conn->state_lock);
4203 }
4204 atomic_set(&conn->connection_reinstatement, 1);
4205 spin_unlock_bh(&conn->state_lock);
4206
4207 /*
4208 * If any other processes are accessing this connection pointer we
4209 * must wait until they have completed.
4210 */
4211 iscsit_check_conn_usage_count(conn);
4212
4213 ahash_request_free(conn->conn_tx_hash);
4214 if (conn->conn_rx_hash) {
4215 struct crypto_ahash *tfm;
4216
4217 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4218 ahash_request_free(conn->conn_rx_hash);
4219 crypto_free_ahash(tfm);
4220 }
4221
4222 free_cpumask_var(conn->conn_cpumask);
4223
4224 kfree(conn->conn_ops);
4225 conn->conn_ops = NULL;
4226
4227 if (conn->sock)
4228 sock_release(conn->sock);
4229
4230 if (conn->conn_transport->iscsit_free_conn)
4231 conn->conn_transport->iscsit_free_conn(conn);
4232
4233 iscsit_put_transport(conn->conn_transport);
4234
4235 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4236 conn->conn_state = TARG_CONN_STATE_FREE;
4237 kfree(conn);
4238
4239 spin_lock_bh(&sess->conn_lock);
4240 atomic_dec(&sess->nconn);
4241 pr_debug("Decremented iSCSI connection count to %hu from node:"
4242 " %s\n", atomic_read(&sess->nconn),
4243 sess->sess_ops->InitiatorName);
4244 /*
4245 * Make sure that if one connection fails in an non ERL=2 iSCSI
4246 * Session that they all fail.
4247 */
4248 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4249 !atomic_read(&sess->session_logout))
4250 atomic_set(&sess->session_fall_back_to_erl0, 1);
4251
4252 /*
4253 * If this was not the last connection in the session, and we are
4254 * performing session reinstatement or falling back to ERL=0, call
4255 * iscsit_stop_session() without sleeping to shutdown the other
4256 * active connections.
4257 */
4258 if (atomic_read(&sess->nconn)) {
4259 if (!atomic_read(&sess->session_reinstatement) &&
4260 !atomic_read(&sess->session_fall_back_to_erl0)) {
4261 spin_unlock_bh(&sess->conn_lock);
4262 return 0;
4263 }
4264 if (!atomic_read(&sess->session_stop_active)) {
4265 atomic_set(&sess->session_stop_active, 1);
4266 spin_unlock_bh(&sess->conn_lock);
4267 iscsit_stop_session(sess, 0, 0);
4268 return 0;
4269 }
4270 spin_unlock_bh(&sess->conn_lock);
4271 return 0;
4272 }
4273
4274 /*
4275 * If this was the last connection in the session and one of the
4276 * following is occurring:
4277 *
4278 * Session Reinstatement is not being performed, and are falling back
4279 * to ERL=0 call iscsit_close_session().
4280 *
4281 * Session Logout was requested. iscsit_close_session() will be called
4282 * elsewhere.
4283 *
4284 * Session Continuation is not being performed, start the Time2Retain
4285 * handler and check if sleep_on_sess_wait_sem is active.
4286 */
4287 if (!atomic_read(&sess->session_reinstatement) &&
4288 atomic_read(&sess->session_fall_back_to_erl0)) {
4289 spin_unlock_bh(&sess->conn_lock);
4290 iscsit_close_session(sess);
4291
4292 return 0;
4293 } else if (atomic_read(&sess->session_logout)) {
4294 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4295 sess->session_state = TARG_SESS_STATE_FREE;
4296 spin_unlock_bh(&sess->conn_lock);
4297
4298 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4299 complete(&sess->session_wait_comp);
4300
4301 return 0;
4302 } else {
4303 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4304 sess->session_state = TARG_SESS_STATE_FAILED;
4305
4306 if (!atomic_read(&sess->session_continuation)) {
4307 spin_unlock_bh(&sess->conn_lock);
4308 iscsit_start_time2retain_handler(sess);
4309 } else
4310 spin_unlock_bh(&sess->conn_lock);
4311
4312 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4313 complete(&sess->session_wait_comp);
4314
4315 return 0;
4316 }
4317 }
4318
4319 /*
4320 * If the iSCSI Session for the iSCSI Initiator Node exists,
4321 * forcefully shutdown the iSCSI NEXUS.
4322 */
4323 int iscsit_close_session(struct iscsi_session *sess)
4324 {
4325 struct iscsi_portal_group *tpg = sess->tpg;
4326 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4327
4328 if (atomic_read(&sess->nconn)) {
4329 pr_err("%d connection(s) still exist for iSCSI session"
4330 " to %s\n", atomic_read(&sess->nconn),
4331 sess->sess_ops->InitiatorName);
4332 BUG();
4333 }
4334
4335 spin_lock_bh(&se_tpg->session_lock);
4336 atomic_set(&sess->session_logout, 1);
4337 atomic_set(&sess->session_reinstatement, 1);
4338 iscsit_stop_time2retain_timer(sess);
4339 spin_unlock_bh(&se_tpg->session_lock);
4340
4341 /*
4342 * transport_deregister_session_configfs() will clear the
4343 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4344 * can be setting it again with __transport_register_session() in
4345 * iscsi_post_login_handler() again after the iscsit_stop_session()
4346 * completes in iscsi_np context.
4347 */
4348 transport_deregister_session_configfs(sess->se_sess);
4349
4350 /*
4351 * If any other processes are accessing this session pointer we must
4352 * wait until they have completed. If we are in an interrupt (the
4353 * time2retain handler) and contain and active session usage count we
4354 * restart the timer and exit.
4355 */
4356 if (!in_interrupt()) {
4357 if (iscsit_check_session_usage_count(sess) == 1)
4358 iscsit_stop_session(sess, 1, 1);
4359 } else {
4360 if (iscsit_check_session_usage_count(sess) == 2) {
4361 atomic_set(&sess->session_logout, 0);
4362 iscsit_start_time2retain_handler(sess);
4363 return 0;
4364 }
4365 }
4366
4367 transport_deregister_session(sess->se_sess);
4368
4369 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4370 iscsit_free_connection_recovery_entires(sess);
4371
4372 iscsit_free_all_ooo_cmdsns(sess);
4373
4374 spin_lock_bh(&se_tpg->session_lock);
4375 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4376 sess->session_state = TARG_SESS_STATE_FREE;
4377 pr_debug("Released iSCSI session from node: %s\n",
4378 sess->sess_ops->InitiatorName);
4379 tpg->nsessions--;
4380 if (tpg->tpg_tiqn)
4381 tpg->tpg_tiqn->tiqn_nsessions--;
4382
4383 pr_debug("Decremented number of active iSCSI Sessions on"
4384 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4385
4386 spin_lock(&sess_idr_lock);
4387 idr_remove(&sess_idr, sess->session_index);
4388 spin_unlock(&sess_idr_lock);
4389
4390 kfree(sess->sess_ops);
4391 sess->sess_ops = NULL;
4392 spin_unlock_bh(&se_tpg->session_lock);
4393
4394 kfree(sess);
4395 return 0;
4396 }
4397
4398 static void iscsit_logout_post_handler_closesession(
4399 struct iscsi_conn *conn)
4400 {
4401 struct iscsi_session *sess = conn->sess;
4402 int sleep = 1;
4403 /*
4404 * Traditional iscsi/tcp will invoke this logic from TX thread
4405 * context during session logout, so clear tx_thread_active and
4406 * sleep if iscsit_close_connection() has not already occured.
4407 *
4408 * Since iser-target invokes this logic from it's own workqueue,
4409 * always sleep waiting for RX/TX thread shutdown to complete
4410 * within iscsit_close_connection().
4411 */
4412 if (!conn->conn_transport->rdma_shutdown)
4413 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4414
4415 atomic_set(&conn->conn_logout_remove, 0);
4416 complete(&conn->conn_logout_comp);
4417
4418 iscsit_dec_conn_usage_count(conn);
4419 iscsit_stop_session(sess, sleep, sleep);
4420 iscsit_dec_session_usage_count(sess);
4421 iscsit_close_session(sess);
4422 }
4423
4424 static void iscsit_logout_post_handler_samecid(
4425 struct iscsi_conn *conn)
4426 {
4427 int sleep = 1;
4428
4429 if (!conn->conn_transport->rdma_shutdown)
4430 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4431
4432 atomic_set(&conn->conn_logout_remove, 0);
4433 complete(&conn->conn_logout_comp);
4434
4435 iscsit_cause_connection_reinstatement(conn, sleep);
4436 iscsit_dec_conn_usage_count(conn);
4437 }
4438
4439 static void iscsit_logout_post_handler_diffcid(
4440 struct iscsi_conn *conn,
4441 u16 cid)
4442 {
4443 struct iscsi_conn *l_conn;
4444 struct iscsi_session *sess = conn->sess;
4445 bool conn_found = false;
4446
4447 if (!sess)
4448 return;
4449
4450 spin_lock_bh(&sess->conn_lock);
4451 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4452 if (l_conn->cid == cid) {
4453 iscsit_inc_conn_usage_count(l_conn);
4454 conn_found = true;
4455 break;
4456 }
4457 }
4458 spin_unlock_bh(&sess->conn_lock);
4459
4460 if (!conn_found)
4461 return;
4462
4463 if (l_conn->sock)
4464 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4465
4466 spin_lock_bh(&l_conn->state_lock);
4467 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4468 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4469 spin_unlock_bh(&l_conn->state_lock);
4470
4471 iscsit_cause_connection_reinstatement(l_conn, 1);
4472 iscsit_dec_conn_usage_count(l_conn);
4473 }
4474
4475 /*
4476 * Return of 0 causes the TX thread to restart.
4477 */
4478 int iscsit_logout_post_handler(
4479 struct iscsi_cmd *cmd,
4480 struct iscsi_conn *conn)
4481 {
4482 int ret = 0;
4483
4484 switch (cmd->logout_reason) {
4485 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4486 switch (cmd->logout_response) {
4487 case ISCSI_LOGOUT_SUCCESS:
4488 case ISCSI_LOGOUT_CLEANUP_FAILED:
4489 default:
4490 iscsit_logout_post_handler_closesession(conn);
4491 break;
4492 }
4493 ret = 0;
4494 break;
4495 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4496 if (conn->cid == cmd->logout_cid) {
4497 switch (cmd->logout_response) {
4498 case ISCSI_LOGOUT_SUCCESS:
4499 case ISCSI_LOGOUT_CLEANUP_FAILED:
4500 default:
4501 iscsit_logout_post_handler_samecid(conn);
4502 break;
4503 }
4504 ret = 0;
4505 } else {
4506 switch (cmd->logout_response) {
4507 case ISCSI_LOGOUT_SUCCESS:
4508 iscsit_logout_post_handler_diffcid(conn,
4509 cmd->logout_cid);
4510 break;
4511 case ISCSI_LOGOUT_CID_NOT_FOUND:
4512 case ISCSI_LOGOUT_CLEANUP_FAILED:
4513 default:
4514 break;
4515 }
4516 ret = 1;
4517 }
4518 break;
4519 case ISCSI_LOGOUT_REASON_RECOVERY:
4520 switch (cmd->logout_response) {
4521 case ISCSI_LOGOUT_SUCCESS:
4522 case ISCSI_LOGOUT_CID_NOT_FOUND:
4523 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4524 case ISCSI_LOGOUT_CLEANUP_FAILED:
4525 default:
4526 break;
4527 }
4528 ret = 1;
4529 break;
4530 default:
4531 break;
4532
4533 }
4534 return ret;
4535 }
4536 EXPORT_SYMBOL(iscsit_logout_post_handler);
4537
4538 void iscsit_fail_session(struct iscsi_session *sess)
4539 {
4540 struct iscsi_conn *conn;
4541
4542 spin_lock_bh(&sess->conn_lock);
4543 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4544 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4545 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4546 }
4547 spin_unlock_bh(&sess->conn_lock);
4548
4549 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4550 sess->session_state = TARG_SESS_STATE_FAILED;
4551 }
4552
4553 int iscsit_free_session(struct iscsi_session *sess)
4554 {
4555 u16 conn_count = atomic_read(&sess->nconn);
4556 struct iscsi_conn *conn, *conn_tmp = NULL;
4557 int is_last;
4558
4559 spin_lock_bh(&sess->conn_lock);
4560 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4561
4562 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4563 conn_list) {
4564 if (conn_count == 0)
4565 break;
4566
4567 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4568 is_last = 1;
4569 } else {
4570 iscsit_inc_conn_usage_count(conn_tmp);
4571 is_last = 0;
4572 }
4573 iscsit_inc_conn_usage_count(conn);
4574
4575 spin_unlock_bh(&sess->conn_lock);
4576 iscsit_cause_connection_reinstatement(conn, 1);
4577 spin_lock_bh(&sess->conn_lock);
4578
4579 iscsit_dec_conn_usage_count(conn);
4580 if (is_last == 0)
4581 iscsit_dec_conn_usage_count(conn_tmp);
4582
4583 conn_count--;
4584 }
4585
4586 if (atomic_read(&sess->nconn)) {
4587 spin_unlock_bh(&sess->conn_lock);
4588 wait_for_completion(&sess->session_wait_comp);
4589 } else
4590 spin_unlock_bh(&sess->conn_lock);
4591
4592 iscsit_close_session(sess);
4593 return 0;
4594 }
4595
4596 void iscsit_stop_session(
4597 struct iscsi_session *sess,
4598 int session_sleep,
4599 int connection_sleep)
4600 {
4601 u16 conn_count = atomic_read(&sess->nconn);
4602 struct iscsi_conn *conn, *conn_tmp = NULL;
4603 int is_last;
4604
4605 spin_lock_bh(&sess->conn_lock);
4606 if (session_sleep)
4607 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4608
4609 if (connection_sleep) {
4610 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4611 conn_list) {
4612 if (conn_count == 0)
4613 break;
4614
4615 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4616 is_last = 1;
4617 } else {
4618 iscsit_inc_conn_usage_count(conn_tmp);
4619 is_last = 0;
4620 }
4621 iscsit_inc_conn_usage_count(conn);
4622
4623 spin_unlock_bh(&sess->conn_lock);
4624 iscsit_cause_connection_reinstatement(conn, 1);
4625 spin_lock_bh(&sess->conn_lock);
4626
4627 iscsit_dec_conn_usage_count(conn);
4628 if (is_last == 0)
4629 iscsit_dec_conn_usage_count(conn_tmp);
4630 conn_count--;
4631 }
4632 } else {
4633 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4634 iscsit_cause_connection_reinstatement(conn, 0);
4635 }
4636
4637 if (session_sleep && atomic_read(&sess->nconn)) {
4638 spin_unlock_bh(&sess->conn_lock);
4639 wait_for_completion(&sess->session_wait_comp);
4640 } else
4641 spin_unlock_bh(&sess->conn_lock);
4642 }
4643
4644 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4645 {
4646 struct iscsi_session *sess;
4647 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4648 struct se_session *se_sess, *se_sess_tmp;
4649 LIST_HEAD(free_list);
4650 int session_count = 0;
4651
4652 spin_lock_bh(&se_tpg->session_lock);
4653 if (tpg->nsessions && !force) {
4654 spin_unlock_bh(&se_tpg->session_lock);
4655 return -1;
4656 }
4657
4658 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4659 sess_list) {
4660 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4661
4662 spin_lock(&sess->conn_lock);
4663 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4664 atomic_read(&sess->session_logout) ||
4665 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4666 spin_unlock(&sess->conn_lock);
4667 continue;
4668 }
4669 atomic_set(&sess->session_reinstatement, 1);
4670 spin_unlock(&sess->conn_lock);
4671
4672 list_move_tail(&se_sess->sess_list, &free_list);
4673 }
4674 spin_unlock_bh(&se_tpg->session_lock);
4675
4676 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4677 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4678
4679 iscsit_free_session(sess);
4680 session_count++;
4681 }
4682
4683 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4684 " Group: %hu\n", session_count, tpg->tpgt);
4685 return 0;
4686 }
4687
4688 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4689 MODULE_VERSION("4.1.x");
4690 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4691 MODULE_LICENSE("GPL");
4692
4693 module_init(iscsi_target_init_module);
4694 module_exit(iscsi_target_cleanup_module);
Linux kernel - Deliverables
This page took 0.132337 seconds and 5 git commands to generate.