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gpio: rcar: Fix runtime PM imbalance on error
[linux/fpc-iii.git] / drivers / target / iscsi / iscsi_target.c
blob59379d6626263247f2e043f4703c91329ae26431
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3 * This file contains main functions related to the iSCSI Target Core Driver.
4 *
5 * (c) Copyright 2007-2013 Datera, Inc.
6 *
7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 *
9 ******************************************************************************/
10
11 #include <crypto/hash.h>
12 #include <linux/string.h>
13 #include <linux/kthread.h>
14 #include <linux/completion.h>
15 #include <linux/module.h>
16 #include <linux/vmalloc.h>
17 #include <linux/idr.h>
18 #include <linux/delay.h>
19 #include <linux/sched/signal.h>
20 #include <asm/unaligned.h>
21 #include <linux/inet.h>
22 #include <net/ipv6.h>
23 #include <scsi/scsi_proto.h>
24 #include <scsi/iscsi_proto.h>
25 #include <scsi/scsi_tcq.h>
26 #include <target/target_core_base.h>
27 #include <target/target_core_fabric.h>
28
29 #include <target/iscsi/iscsi_target_core.h>
30 #include "iscsi_target_parameters.h"
31 #include "iscsi_target_seq_pdu_list.h"
32 #include "iscsi_target_datain_values.h"
33 #include "iscsi_target_erl0.h"
34 #include "iscsi_target_erl1.h"
35 #include "iscsi_target_erl2.h"
36 #include "iscsi_target_login.h"
37 #include "iscsi_target_tmr.h"
38 #include "iscsi_target_tpg.h"
39 #include "iscsi_target_util.h"
40 #include "iscsi_target.h"
41 #include "iscsi_target_device.h"
42 #include <target/iscsi/iscsi_target_stat.h>
43
44 #include <target/iscsi/iscsi_transport.h>
45
46 static LIST_HEAD(g_tiqn_list);
47 static LIST_HEAD(g_np_list);
48 static DEFINE_SPINLOCK(tiqn_lock);
49 static DEFINE_MUTEX(np_lock);
50
51 static struct idr tiqn_idr;
52 DEFINE_IDA(sess_ida);
53 struct mutex auth_id_lock;
54
55 struct iscsit_global *iscsit_global;
56
57 struct kmem_cache *lio_qr_cache;
58 struct kmem_cache *lio_dr_cache;
59 struct kmem_cache *lio_ooo_cache;
60 struct kmem_cache *lio_r2t_cache;
61
62 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
63 struct iscsi_scsi_req *, u32);
64
65 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
66 {
67 struct iscsi_tiqn *tiqn = NULL;
68
69 spin_lock(&tiqn_lock);
70 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
71 if (!strcmp(tiqn->tiqn, buf)) {
72
73 spin_lock(&tiqn->tiqn_state_lock);
74 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
75 tiqn->tiqn_access_count++;
76 spin_unlock(&tiqn->tiqn_state_lock);
77 spin_unlock(&tiqn_lock);
78 return tiqn;
79 }
80 spin_unlock(&tiqn->tiqn_state_lock);
81 }
82 }
83 spin_unlock(&tiqn_lock);
84
85 return NULL;
86 }
87
88 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
89 {
90 spin_lock(&tiqn->tiqn_state_lock);
91 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
92 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
93 spin_unlock(&tiqn->tiqn_state_lock);
94 return 0;
95 }
96 spin_unlock(&tiqn->tiqn_state_lock);
97
98 return -1;
99 }
100
101 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
102 {
103 spin_lock(&tiqn->tiqn_state_lock);
104 tiqn->tiqn_access_count--;
105 spin_unlock(&tiqn->tiqn_state_lock);
106 }
107
108 /*
109 * Note that IQN formatting is expected to be done in userspace, and
110 * no explict IQN format checks are done here.
111 */
112 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
113 {
114 struct iscsi_tiqn *tiqn = NULL;
115 int ret;
116
117 if (strlen(buf) >= ISCSI_IQN_LEN) {
118 pr_err("Target IQN exceeds %d bytes\n",
119 ISCSI_IQN_LEN);
120 return ERR_PTR(-EINVAL);
121 }
122
123 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
124 if (!tiqn)
125 return ERR_PTR(-ENOMEM);
126
127 sprintf(tiqn->tiqn, "%s", buf);
128 INIT_LIST_HEAD(&tiqn->tiqn_list);
129 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
130 spin_lock_init(&tiqn->tiqn_state_lock);
131 spin_lock_init(&tiqn->tiqn_tpg_lock);
132 spin_lock_init(&tiqn->sess_err_stats.lock);
133 spin_lock_init(&tiqn->login_stats.lock);
134 spin_lock_init(&tiqn->logout_stats.lock);
135
136 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
137
138 idr_preload(GFP_KERNEL);
139 spin_lock(&tiqn_lock);
140
141 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
142 if (ret < 0) {
143 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
144 spin_unlock(&tiqn_lock);
145 idr_preload_end();
146 kfree(tiqn);
147 return ERR_PTR(ret);
148 }
149 tiqn->tiqn_index = ret;
150 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
151
152 spin_unlock(&tiqn_lock);
153 idr_preload_end();
154
155 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
156
157 return tiqn;
158
159 }
160
161 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
162 {
163 /*
164 * Wait for accesses to said struct iscsi_tiqn to end.
165 */
166 spin_lock(&tiqn->tiqn_state_lock);
167 while (tiqn->tiqn_access_count != 0) {
168 spin_unlock(&tiqn->tiqn_state_lock);
169 msleep(10);
170 spin_lock(&tiqn->tiqn_state_lock);
171 }
172 spin_unlock(&tiqn->tiqn_state_lock);
173 }
174
175 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
176 {
177 /*
178 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
179 * while holding tiqn->tiqn_state_lock. This means that all subsequent
180 * attempts to access this struct iscsi_tiqn will fail from both transport
181 * fabric and control code paths.
182 */
183 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
184 pr_err("iscsit_set_tiqn_shutdown() failed\n");
185 return;
186 }
187
188 iscsit_wait_for_tiqn(tiqn);
189
190 spin_lock(&tiqn_lock);
191 list_del(&tiqn->tiqn_list);
192 idr_remove(&tiqn_idr, tiqn->tiqn_index);
193 spin_unlock(&tiqn_lock);
194
195 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
196 tiqn->tiqn);
197 kfree(tiqn);
198 }
199
200 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
201 {
202 int ret;
203 /*
204 * Determine if the network portal is accepting storage traffic.
205 */
206 spin_lock_bh(&np->np_thread_lock);
207 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
208 spin_unlock_bh(&np->np_thread_lock);
209 return -1;
210 }
211 spin_unlock_bh(&np->np_thread_lock);
212 /*
213 * Determine if the portal group is accepting storage traffic.
214 */
215 spin_lock_bh(&tpg->tpg_state_lock);
216 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
217 spin_unlock_bh(&tpg->tpg_state_lock);
218 return -1;
219 }
220 spin_unlock_bh(&tpg->tpg_state_lock);
221
222 /*
223 * Here we serialize access across the TIQN+TPG Tuple.
224 */
225 ret = down_interruptible(&tpg->np_login_sem);
226 if (ret != 0)
227 return -1;
228
229 spin_lock_bh(&tpg->tpg_state_lock);
230 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
231 spin_unlock_bh(&tpg->tpg_state_lock);
232 up(&tpg->np_login_sem);
233 return -1;
234 }
235 spin_unlock_bh(&tpg->tpg_state_lock);
236
237 return 0;
238 }
239
240 void iscsit_login_kref_put(struct kref *kref)
241 {
242 struct iscsi_tpg_np *tpg_np = container_of(kref,
243 struct iscsi_tpg_np, tpg_np_kref);
244
245 complete(&tpg_np->tpg_np_comp);
246 }
247
248 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
249 struct iscsi_tpg_np *tpg_np)
250 {
251 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
252
253 up(&tpg->np_login_sem);
254
255 if (tpg_np)
256 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
257
258 if (tiqn)
259 iscsit_put_tiqn_for_login(tiqn);
260
261 return 0;
262 }
263
264 bool iscsit_check_np_match(
265 struct sockaddr_storage *sockaddr,
266 struct iscsi_np *np,
267 int network_transport)
268 {
269 struct sockaddr_in *sock_in, *sock_in_e;
270 struct sockaddr_in6 *sock_in6, *sock_in6_e;
271 bool ip_match = false;
272 u16 port, port_e;
273
274 if (sockaddr->ss_family == AF_INET6) {
275 sock_in6 = (struct sockaddr_in6 *)sockaddr;
276 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
277
278 if (!memcmp(&sock_in6->sin6_addr.in6_u,
279 &sock_in6_e->sin6_addr.in6_u,
280 sizeof(struct in6_addr)))
281 ip_match = true;
282
283 port = ntohs(sock_in6->sin6_port);
284 port_e = ntohs(sock_in6_e->sin6_port);
285 } else {
286 sock_in = (struct sockaddr_in *)sockaddr;
287 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
288
289 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
290 ip_match = true;
291
292 port = ntohs(sock_in->sin_port);
293 port_e = ntohs(sock_in_e->sin_port);
294 }
295
296 if (ip_match && (port_e == port) &&
297 (np->np_network_transport == network_transport))
298 return true;
299
300 return false;
301 }
302
303 static struct iscsi_np *iscsit_get_np(
304 struct sockaddr_storage *sockaddr,
305 int network_transport)
306 {
307 struct iscsi_np *np;
308 bool match;
309
310 lockdep_assert_held(&np_lock);
311
312 list_for_each_entry(np, &g_np_list, np_list) {
313 spin_lock_bh(&np->np_thread_lock);
314 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
315 spin_unlock_bh(&np->np_thread_lock);
316 continue;
317 }
318
319 match = iscsit_check_np_match(sockaddr, np, network_transport);
320 if (match) {
321 /*
322 * Increment the np_exports reference count now to
323 * prevent iscsit_del_np() below from being called
324 * while iscsi_tpg_add_network_portal() is called.
325 */
326 np->np_exports++;
327 spin_unlock_bh(&np->np_thread_lock);
328 return np;
329 }
330 spin_unlock_bh(&np->np_thread_lock);
331 }
332
333 return NULL;
334 }
335
336 struct iscsi_np *iscsit_add_np(
337 struct sockaddr_storage *sockaddr,
338 int network_transport)
339 {
340 struct iscsi_np *np;
341 int ret;
342
343 mutex_lock(&np_lock);
344
345 /*
346 * Locate the existing struct iscsi_np if already active..
347 */
348 np = iscsit_get_np(sockaddr, network_transport);
349 if (np) {
350 mutex_unlock(&np_lock);
351 return np;
352 }
353
354 np = kzalloc(sizeof(*np), GFP_KERNEL);
355 if (!np) {
356 mutex_unlock(&np_lock);
357 return ERR_PTR(-ENOMEM);
358 }
359
360 np->np_flags |= NPF_IP_NETWORK;
361 np->np_network_transport = network_transport;
362 spin_lock_init(&np->np_thread_lock);
363 init_completion(&np->np_restart_comp);
364 INIT_LIST_HEAD(&np->np_list);
365
366 timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
367
368 ret = iscsi_target_setup_login_socket(np, sockaddr);
369 if (ret != 0) {
370 kfree(np);
371 mutex_unlock(&np_lock);
372 return ERR_PTR(ret);
373 }
374
375 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
376 if (IS_ERR(np->np_thread)) {
377 pr_err("Unable to create kthread: iscsi_np\n");
378 ret = PTR_ERR(np->np_thread);
379 kfree(np);
380 mutex_unlock(&np_lock);
381 return ERR_PTR(ret);
382 }
383 /*
384 * Increment the np_exports reference count now to prevent
385 * iscsit_del_np() below from being run while a new call to
386 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
387 * active. We don't need to hold np->np_thread_lock at this
388 * point because iscsi_np has not been added to g_np_list yet.
389 */
390 np->np_exports = 1;
391 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
392
393 list_add_tail(&np->np_list, &g_np_list);
394 mutex_unlock(&np_lock);
395
396 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
397 &np->np_sockaddr, np->np_transport->name);
398
399 return np;
400 }
401
402 int iscsit_reset_np_thread(
403 struct iscsi_np *np,
404 struct iscsi_tpg_np *tpg_np,
405 struct iscsi_portal_group *tpg,
406 bool shutdown)
407 {
408 spin_lock_bh(&np->np_thread_lock);
409 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
410 spin_unlock_bh(&np->np_thread_lock);
411 return 0;
412 }
413 np->np_thread_state = ISCSI_NP_THREAD_RESET;
414 atomic_inc(&np->np_reset_count);
415
416 if (np->np_thread) {
417 spin_unlock_bh(&np->np_thread_lock);
418 send_sig(SIGINT, np->np_thread, 1);
419 wait_for_completion(&np->np_restart_comp);
420 spin_lock_bh(&np->np_thread_lock);
421 }
422 spin_unlock_bh(&np->np_thread_lock);
423
424 if (tpg_np && shutdown) {
425 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
426
427 wait_for_completion(&tpg_np->tpg_np_comp);
428 }
429
430 return 0;
431 }
432
433 static void iscsit_free_np(struct iscsi_np *np)
434 {
435 if (np->np_socket)
436 sock_release(np->np_socket);
437 }
438
439 int iscsit_del_np(struct iscsi_np *np)
440 {
441 spin_lock_bh(&np->np_thread_lock);
442 np->np_exports--;
443 if (np->np_exports) {
444 np->enabled = true;
445 spin_unlock_bh(&np->np_thread_lock);
446 return 0;
447 }
448 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
449 spin_unlock_bh(&np->np_thread_lock);
450
451 if (np->np_thread) {
452 /*
453 * We need to send the signal to wakeup Linux/Net
454 * which may be sleeping in sock_accept()..
455 */
456 send_sig(SIGINT, np->np_thread, 1);
457 kthread_stop(np->np_thread);
458 np->np_thread = NULL;
459 }
460
461 np->np_transport->iscsit_free_np(np);
462
463 mutex_lock(&np_lock);
464 list_del(&np->np_list);
465 mutex_unlock(&np_lock);
466
467 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
468 &np->np_sockaddr, np->np_transport->name);
469
470 iscsit_put_transport(np->np_transport);
471 kfree(np);
472 return 0;
473 }
474
475 static void iscsit_get_rx_pdu(struct iscsi_conn *);
476
477 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
478 {
479 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
480 }
481 EXPORT_SYMBOL(iscsit_queue_rsp);
482
483 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
484 {
485 spin_lock_bh(&conn->cmd_lock);
486 if (!list_empty(&cmd->i_conn_node) &&
487 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
488 list_del_init(&cmd->i_conn_node);
489 spin_unlock_bh(&conn->cmd_lock);
490
491 __iscsit_free_cmd(cmd, true);
492 }
493 EXPORT_SYMBOL(iscsit_aborted_task);
494
495 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
496 u32, u32, const void *, void *);
497 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
498
499 static int
500 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
501 const void *data_buf, u32 data_buf_len)
502 {
503 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
504 struct kvec *iov;
505 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
506 int ret;
507
508 iov = &cmd->iov_misc[0];
509 iov[niov].iov_base = cmd->pdu;
510 iov[niov++].iov_len = ISCSI_HDR_LEN;
511
512 if (conn->conn_ops->HeaderDigest) {
513 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
514
515 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
516 ISCSI_HDR_LEN, 0, NULL,
517 header_digest);
518
519 iov[0].iov_len += ISCSI_CRC_LEN;
520 tx_size += ISCSI_CRC_LEN;
521 pr_debug("Attaching CRC32C HeaderDigest"
522 " to opcode 0x%x 0x%08x\n",
523 hdr->opcode, *header_digest);
524 }
525
526 if (data_buf_len) {
527 u32 padding = ((-data_buf_len) & 3);
528
529 iov[niov].iov_base = (void *)data_buf;
530 iov[niov++].iov_len = data_buf_len;
531 tx_size += data_buf_len;
532
533 if (padding != 0) {
534 iov[niov].iov_base = &cmd->pad_bytes;
535 iov[niov++].iov_len = padding;
536 tx_size += padding;
537 pr_debug("Attaching %u additional"
538 " padding bytes.\n", padding);
539 }
540
541 if (conn->conn_ops->DataDigest) {
542 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
543 data_buf, data_buf_len,
544 padding, &cmd->pad_bytes,
545 &cmd->data_crc);
546
547 iov[niov].iov_base = &cmd->data_crc;
548 iov[niov++].iov_len = ISCSI_CRC_LEN;
549 tx_size += ISCSI_CRC_LEN;
550 pr_debug("Attached DataDigest for %u"
551 " bytes opcode 0x%x, CRC 0x%08x\n",
552 data_buf_len, hdr->opcode, cmd->data_crc);
553 }
554 }
555
556 cmd->iov_misc_count = niov;
557 cmd->tx_size = tx_size;
558
559 ret = iscsit_send_tx_data(cmd, conn, 1);
560 if (ret < 0) {
561 iscsit_tx_thread_wait_for_tcp(conn);
562 return ret;
563 }
564
565 return 0;
566 }
567
568 static int iscsit_map_iovec(struct iscsi_cmd *cmd, struct kvec *iov, int nvec,
569 u32 data_offset, u32 data_length);
570 static void iscsit_unmap_iovec(struct iscsi_cmd *);
571 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
572 u32, u32, u32, u8 *);
573 static int
574 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
575 const struct iscsi_datain *datain)
576 {
577 struct kvec *iov;
578 u32 iov_count = 0, tx_size = 0;
579 int ret, iov_ret;
580
581 iov = &cmd->iov_data[0];
582 iov[iov_count].iov_base = cmd->pdu;
583 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
584 tx_size += ISCSI_HDR_LEN;
585
586 if (conn->conn_ops->HeaderDigest) {
587 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
588
589 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
590 ISCSI_HDR_LEN, 0, NULL,
591 header_digest);
592
593 iov[0].iov_len += ISCSI_CRC_LEN;
594 tx_size += ISCSI_CRC_LEN;
595
596 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
597 *header_digest);
598 }
599
600 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[iov_count],
601 cmd->orig_iov_data_count - (iov_count + 2),
602 datain->offset, datain->length);
603 if (iov_ret < 0)
604 return -1;
605
606 iov_count += iov_ret;
607 tx_size += datain->length;
608
609 cmd->padding = ((-datain->length) & 3);
610 if (cmd->padding) {
611 iov[iov_count].iov_base = cmd->pad_bytes;
612 iov[iov_count++].iov_len = cmd->padding;
613 tx_size += cmd->padding;
614
615 pr_debug("Attaching %u padding bytes\n", cmd->padding);
616 }
617
618 if (conn->conn_ops->DataDigest) {
619 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
620 cmd, datain->offset,
621 datain->length,
622 cmd->padding,
623 cmd->pad_bytes);
624
625 iov[iov_count].iov_base = &cmd->data_crc;
626 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
627 tx_size += ISCSI_CRC_LEN;
628
629 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
630 datain->length + cmd->padding, cmd->data_crc);
631 }
632
633 cmd->iov_data_count = iov_count;
634 cmd->tx_size = tx_size;
635
636 ret = iscsit_fe_sendpage_sg(cmd, conn);
637
638 iscsit_unmap_iovec(cmd);
639
640 if (ret < 0) {
641 iscsit_tx_thread_wait_for_tcp(conn);
642 return ret;
643 }
644
645 return 0;
646 }
647
648 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
649 struct iscsi_datain_req *dr, const void *buf,
650 u32 buf_len)
651 {
652 if (dr)
653 return iscsit_xmit_datain_pdu(conn, cmd, buf);
654 else
655 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
656 }
657
658 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
659 {
660 return TARGET_PROT_NORMAL;
661 }
662
663 static struct iscsit_transport iscsi_target_transport = {
664 .name = "iSCSI/TCP",
665 .transport_type = ISCSI_TCP,
666 .rdma_shutdown = false,
667 .owner = NULL,
668 .iscsit_setup_np = iscsit_setup_np,
669 .iscsit_accept_np = iscsit_accept_np,
670 .iscsit_free_np = iscsit_free_np,
671 .iscsit_get_login_rx = iscsit_get_login_rx,
672 .iscsit_put_login_tx = iscsit_put_login_tx,
673 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
674 .iscsit_immediate_queue = iscsit_immediate_queue,
675 .iscsit_response_queue = iscsit_response_queue,
676 .iscsit_queue_data_in = iscsit_queue_rsp,
677 .iscsit_queue_status = iscsit_queue_rsp,
678 .iscsit_aborted_task = iscsit_aborted_task,
679 .iscsit_xmit_pdu = iscsit_xmit_pdu,
680 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
681 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
682 };
683
684 static int __init iscsi_target_init_module(void)
685 {
686 int ret = 0, size;
687
688 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
689 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
690 if (!iscsit_global)
691 return -1;
692
693 spin_lock_init(&iscsit_global->ts_bitmap_lock);
694 mutex_init(&auth_id_lock);
695 idr_init(&tiqn_idr);
696
697 ret = target_register_template(&iscsi_ops);
698 if (ret)
699 goto out;
700
701 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
702 iscsit_global->ts_bitmap = vzalloc(size);
703 if (!iscsit_global->ts_bitmap)
704 goto configfs_out;
705
706 lio_qr_cache = kmem_cache_create("lio_qr_cache",
707 sizeof(struct iscsi_queue_req),
708 __alignof__(struct iscsi_queue_req), 0, NULL);
709 if (!lio_qr_cache) {
710 pr_err("Unable to kmem_cache_create() for"
711 " lio_qr_cache\n");
712 goto bitmap_out;
713 }
714
715 lio_dr_cache = kmem_cache_create("lio_dr_cache",
716 sizeof(struct iscsi_datain_req),
717 __alignof__(struct iscsi_datain_req), 0, NULL);
718 if (!lio_dr_cache) {
719 pr_err("Unable to kmem_cache_create() for"
720 " lio_dr_cache\n");
721 goto qr_out;
722 }
723
724 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
725 sizeof(struct iscsi_ooo_cmdsn),
726 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
727 if (!lio_ooo_cache) {
728 pr_err("Unable to kmem_cache_create() for"
729 " lio_ooo_cache\n");
730 goto dr_out;
731 }
732
733 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
734 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
735 0, NULL);
736 if (!lio_r2t_cache) {
737 pr_err("Unable to kmem_cache_create() for"
738 " lio_r2t_cache\n");
739 goto ooo_out;
740 }
741
742 iscsit_register_transport(&iscsi_target_transport);
743
744 if (iscsit_load_discovery_tpg() < 0)
745 goto r2t_out;
746
747 return ret;
748 r2t_out:
749 iscsit_unregister_transport(&iscsi_target_transport);
750 kmem_cache_destroy(lio_r2t_cache);
751 ooo_out:
752 kmem_cache_destroy(lio_ooo_cache);
753 dr_out:
754 kmem_cache_destroy(lio_dr_cache);
755 qr_out:
756 kmem_cache_destroy(lio_qr_cache);
757 bitmap_out:
758 vfree(iscsit_global->ts_bitmap);
759 configfs_out:
760 /* XXX: this probably wants it to be it's own unwind step.. */
761 if (iscsit_global->discovery_tpg)
762 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
763 target_unregister_template(&iscsi_ops);
764 out:
765 kfree(iscsit_global);
766 return -ENOMEM;
767 }
768
769 static void __exit iscsi_target_cleanup_module(void)
770 {
771 iscsit_release_discovery_tpg();
772 iscsit_unregister_transport(&iscsi_target_transport);
773 kmem_cache_destroy(lio_qr_cache);
774 kmem_cache_destroy(lio_dr_cache);
775 kmem_cache_destroy(lio_ooo_cache);
776 kmem_cache_destroy(lio_r2t_cache);
777
778 /*
779 * Shutdown discovery sessions and disable discovery TPG
780 */
781 if (iscsit_global->discovery_tpg)
782 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
783
784 target_unregister_template(&iscsi_ops);
785
786 vfree(iscsit_global->ts_bitmap);
787 kfree(iscsit_global);
788 }
789
790 int iscsit_add_reject(
791 struct iscsi_conn *conn,
792 u8 reason,
793 unsigned char *buf)
794 {
795 struct iscsi_cmd *cmd;
796
797 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
798 if (!cmd)
799 return -1;
800
801 cmd->iscsi_opcode = ISCSI_OP_REJECT;
802 cmd->reject_reason = reason;
803
804 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
805 if (!cmd->buf_ptr) {
806 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
807 iscsit_free_cmd(cmd, false);
808 return -1;
809 }
810
811 spin_lock_bh(&conn->cmd_lock);
812 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
813 spin_unlock_bh(&conn->cmd_lock);
814
815 cmd->i_state = ISTATE_SEND_REJECT;
816 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
817
818 return -1;
819 }
820 EXPORT_SYMBOL(iscsit_add_reject);
821
822 static int iscsit_add_reject_from_cmd(
823 struct iscsi_cmd *cmd,
824 u8 reason,
825 bool add_to_conn,
826 unsigned char *buf)
827 {
828 struct iscsi_conn *conn;
829 const bool do_put = cmd->se_cmd.se_tfo != NULL;
830
831 if (!cmd->conn) {
832 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
833 cmd->init_task_tag);
834 return -1;
835 }
836 conn = cmd->conn;
837
838 cmd->iscsi_opcode = ISCSI_OP_REJECT;
839 cmd->reject_reason = reason;
840
841 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
842 if (!cmd->buf_ptr) {
843 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
844 iscsit_free_cmd(cmd, false);
845 return -1;
846 }
847
848 if (add_to_conn) {
849 spin_lock_bh(&conn->cmd_lock);
850 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
851 spin_unlock_bh(&conn->cmd_lock);
852 }
853
854 cmd->i_state = ISTATE_SEND_REJECT;
855 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
856 /*
857 * Perform the kref_put now if se_cmd has already been setup by
858 * scsit_setup_scsi_cmd()
859 */
860 if (do_put) {
861 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
862 target_put_sess_cmd(&cmd->se_cmd);
863 }
864 return -1;
865 }
866
867 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
868 unsigned char *buf)
869 {
870 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
871 }
872
873 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
874 {
875 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
876 }
877 EXPORT_SYMBOL(iscsit_reject_cmd);
878
879 /*
880 * Map some portion of the allocated scatterlist to an iovec, suitable for
881 * kernel sockets to copy data in/out.
882 */
883 static int iscsit_map_iovec(struct iscsi_cmd *cmd, struct kvec *iov, int nvec,
884 u32 data_offset, u32 data_length)
885 {
886 u32 i = 0, orig_data_length = data_length;
887 struct scatterlist *sg;
888 unsigned int page_off;
889
890 /*
891 * We know each entry in t_data_sg contains a page.
892 */
893 u32 ent = data_offset / PAGE_SIZE;
894
895 if (!data_length)
896 return 0;
897
898 if (ent >= cmd->se_cmd.t_data_nents) {
899 pr_err("Initial page entry out-of-bounds\n");
900 goto overflow;
901 }
902
903 sg = &cmd->se_cmd.t_data_sg[ent];
904 page_off = (data_offset % PAGE_SIZE);
905
906 cmd->first_data_sg = sg;
907 cmd->first_data_sg_off = page_off;
908
909 while (data_length) {
910 u32 cur_len;
911
912 if (WARN_ON_ONCE(!sg || i >= nvec))
913 goto overflow;
914
915 cur_len = min_t(u32, data_length, sg->length - page_off);
916
917 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
918 iov[i].iov_len = cur_len;
919
920 data_length -= cur_len;
921 page_off = 0;
922 sg = sg_next(sg);
923 i++;
924 }
925
926 cmd->kmapped_nents = i;
927
928 return i;
929
930 overflow:
931 pr_err("offset %d + length %d overflow; %d/%d; sg-list:\n",
932 data_offset, orig_data_length, i, nvec);
933 for_each_sg(cmd->se_cmd.t_data_sg, sg,
934 cmd->se_cmd.t_data_nents, i) {
935 pr_err("[%d] off %d len %d\n",
936 i, sg->offset, sg->length);
937 }
938 return -1;
939 }
940
941 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
942 {
943 u32 i;
944 struct scatterlist *sg;
945
946 sg = cmd->first_data_sg;
947
948 for (i = 0; i < cmd->kmapped_nents; i++)
949 kunmap(sg_page(&sg[i]));
950 }
951
952 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
953 {
954 LIST_HEAD(ack_list);
955 struct iscsi_cmd *cmd, *cmd_p;
956
957 conn->exp_statsn = exp_statsn;
958
959 if (conn->sess->sess_ops->RDMAExtensions)
960 return;
961
962 spin_lock_bh(&conn->cmd_lock);
963 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
964 spin_lock(&cmd->istate_lock);
965 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
966 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
967 cmd->i_state = ISTATE_REMOVE;
968 spin_unlock(&cmd->istate_lock);
969 list_move_tail(&cmd->i_conn_node, &ack_list);
970 continue;
971 }
972 spin_unlock(&cmd->istate_lock);
973 }
974 spin_unlock_bh(&conn->cmd_lock);
975
976 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
977 list_del_init(&cmd->i_conn_node);
978 iscsit_free_cmd(cmd, false);
979 }
980 }
981
982 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
983 {
984 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
985
986 iov_count += ISCSI_IOV_DATA_BUFFER;
987 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
988 if (!cmd->iov_data)
989 return -ENOMEM;
990
991 cmd->orig_iov_data_count = iov_count;
992 return 0;
993 }
994
995 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
996 unsigned char *buf)
997 {
998 int data_direction, payload_length;
999 struct iscsi_scsi_req *hdr;
1000 int iscsi_task_attr;
1001 int sam_task_attr;
1002
1003 atomic_long_inc(&conn->sess->cmd_pdus);
1004
1005 hdr = (struct iscsi_scsi_req *) buf;
1006 payload_length = ntoh24(hdr->dlength);
1007
1008 /* FIXME; Add checks for AdditionalHeaderSegment */
1009
1010 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1011 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1012 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1013 " not set. Bad iSCSI Initiator.\n");
1014 return iscsit_add_reject_cmd(cmd,
1015 ISCSI_REASON_BOOKMARK_INVALID, buf);
1016 }
1017
1018 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1019 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1020 /*
1021 * From RFC-3720 Section 10.3.1:
1022 *
1023 * "Either or both of R and W MAY be 1 when either the
1024 * Expected Data Transfer Length and/or Bidirectional Read
1025 * Expected Data Transfer Length are 0"
1026 *
1027 * For this case, go ahead and clear the unnecssary bits
1028 * to avoid any confusion with ->data_direction.
1029 */
1030 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1031 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1032
1033 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1034 " set when Expected Data Transfer Length is 0 for"
1035 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1036 }
1037
1038 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1039 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1040 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1041 " MUST be set if Expected Data Transfer Length is not 0."
1042 " Bad iSCSI Initiator\n");
1043 return iscsit_add_reject_cmd(cmd,
1044 ISCSI_REASON_BOOKMARK_INVALID, buf);
1045 }
1046
1047 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1048 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1049 pr_err("Bidirectional operations not supported!\n");
1050 return iscsit_add_reject_cmd(cmd,
1051 ISCSI_REASON_BOOKMARK_INVALID, buf);
1052 }
1053
1054 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1055 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1056 " Scsi Command PDU.\n");
1057 return iscsit_add_reject_cmd(cmd,
1058 ISCSI_REASON_BOOKMARK_INVALID, buf);
1059 }
1060
1061 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1062 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1063 " protocol error.\n", payload_length);
1064 return iscsit_add_reject_cmd(cmd,
1065 ISCSI_REASON_PROTOCOL_ERROR, buf);
1066 }
1067
1068 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1069 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1070 pr_err("Expected Data Transfer Length and Length of"
1071 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1072 " bit is not set protocol error\n");
1073 return iscsit_add_reject_cmd(cmd,
1074 ISCSI_REASON_PROTOCOL_ERROR, buf);
1075 }
1076
1077 if (payload_length > be32_to_cpu(hdr->data_length)) {
1078 pr_err("DataSegmentLength: %u is greater than"
1079 " EDTL: %u, protocol error.\n", payload_length,
1080 hdr->data_length);
1081 return iscsit_add_reject_cmd(cmd,
1082 ISCSI_REASON_PROTOCOL_ERROR, buf);
1083 }
1084
1085 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1086 pr_err("DataSegmentLength: %u is greater than"
1087 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1088 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1089 return iscsit_add_reject_cmd(cmd,
1090 ISCSI_REASON_PROTOCOL_ERROR, buf);
1091 }
1092
1093 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1094 pr_err("DataSegmentLength: %u is greater than"
1095 " FirstBurstLength: %u, protocol error.\n",
1096 payload_length, conn->sess->sess_ops->FirstBurstLength);
1097 return iscsit_add_reject_cmd(cmd,
1098 ISCSI_REASON_BOOKMARK_INVALID, buf);
1099 }
1100
1101 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1102 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1103 DMA_NONE;
1104
1105 cmd->data_direction = data_direction;
1106 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1107 /*
1108 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1109 */
1110 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1111 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1112 sam_task_attr = TCM_SIMPLE_TAG;
1113 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1114 sam_task_attr = TCM_ORDERED_TAG;
1115 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1116 sam_task_attr = TCM_HEAD_TAG;
1117 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1118 sam_task_attr = TCM_ACA_TAG;
1119 else {
1120 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1121 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1122 sam_task_attr = TCM_SIMPLE_TAG;
1123 }
1124
1125 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1126 cmd->i_state = ISTATE_NEW_CMD;
1127 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1128 cmd->immediate_data = (payload_length) ? 1 : 0;
1129 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1130 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1131 if (cmd->unsolicited_data)
1132 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1133
1134 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1135 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1136 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1137 else
1138 cmd->targ_xfer_tag = 0xFFFFFFFF;
1139 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1140 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1141 cmd->first_burst_len = payload_length;
1142
1143 if (!conn->sess->sess_ops->RDMAExtensions &&
1144 cmd->data_direction == DMA_FROM_DEVICE) {
1145 struct iscsi_datain_req *dr;
1146
1147 dr = iscsit_allocate_datain_req();
1148 if (!dr)
1149 return iscsit_add_reject_cmd(cmd,
1150 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1151
1152 iscsit_attach_datain_req(cmd, dr);
1153 }
1154
1155 /*
1156 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1157 */
1158 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1159 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1160 cmd->data_direction, sam_task_attr,
1161 cmd->sense_buffer + 2);
1162
1163 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1164 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1165 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1166 conn->cid);
1167
1168 target_get_sess_cmd(&cmd->se_cmd, true);
1169
1170 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1171 scsilun_to_int(&hdr->lun));
1172 if (cmd->sense_reason)
1173 goto attach_cmd;
1174
1175 /* only used for printks or comparing with ->ref_task_tag */
1176 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1177 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1178 if (cmd->sense_reason) {
1179 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1180 return iscsit_add_reject_cmd(cmd,
1181 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1182 }
1183
1184 goto attach_cmd;
1185 }
1186
1187 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1188 return iscsit_add_reject_cmd(cmd,
1189 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1190 }
1191
1192 attach_cmd:
1193 spin_lock_bh(&conn->cmd_lock);
1194 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1195 spin_unlock_bh(&conn->cmd_lock);
1196 /*
1197 * Check if we need to delay processing because of ALUA
1198 * Active/NonOptimized primary access state..
1199 */
1200 core_alua_check_nonop_delay(&cmd->se_cmd);
1201
1202 return 0;
1203 }
1204 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1205
1206 void iscsit_set_unsolicited_dataout(struct iscsi_cmd *cmd)
1207 {
1208 iscsit_set_dataout_sequence_values(cmd);
1209
1210 spin_lock_bh(&cmd->dataout_timeout_lock);
1211 iscsit_start_dataout_timer(cmd, cmd->conn);
1212 spin_unlock_bh(&cmd->dataout_timeout_lock);
1213 }
1214 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout);
1215
1216 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1217 struct iscsi_scsi_req *hdr)
1218 {
1219 int cmdsn_ret = 0;
1220 /*
1221 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1222 * the Immediate Bit is not set, and no Immediate
1223 * Data is attached.
1224 *
1225 * A PDU/CmdSN carrying Immediate Data can only
1226 * be processed after the DataCRC has passed.
1227 * If the DataCRC fails, the CmdSN MUST NOT
1228 * be acknowledged. (See below)
1229 */
1230 if (!cmd->immediate_data) {
1231 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1232 (unsigned char *)hdr, hdr->cmdsn);
1233 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1234 return -1;
1235 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1236 target_put_sess_cmd(&cmd->se_cmd);
1237 return 0;
1238 }
1239 }
1240
1241 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1242
1243 /*
1244 * If no Immediate Data is attached, it's OK to return now.
1245 */
1246 if (!cmd->immediate_data) {
1247 if (!cmd->sense_reason && cmd->unsolicited_data)
1248 iscsit_set_unsolicited_dataout(cmd);
1249 if (!cmd->sense_reason)
1250 return 0;
1251
1252 target_put_sess_cmd(&cmd->se_cmd);
1253 return 0;
1254 }
1255
1256 /*
1257 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1258 * execution. These exceptions are processed in CmdSN order using
1259 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1260 */
1261 if (cmd->sense_reason)
1262 return 1;
1263 /*
1264 * Call directly into transport_generic_new_cmd() to perform
1265 * the backend memory allocation.
1266 */
1267 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1268 if (cmd->sense_reason)
1269 return 1;
1270
1271 return 0;
1272 }
1273 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1274
1275 static int
1276 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1277 bool dump_payload)
1278 {
1279 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1280 int rc;
1281
1282 /*
1283 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1284 */
1285 if (dump_payload) {
1286 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done,
1287 cmd->first_burst_len);
1288
1289 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n",
1290 cmd->se_cmd.data_length, cmd->write_data_done,
1291 cmd->first_burst_len, length);
1292 rc = iscsit_dump_data_payload(cmd->conn, length, 1);
1293 pr_debug("Finished dumping immediate data\n");
1294 if (rc < 0)
1295 immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER;
1296 } else {
1297 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1298 cmd->first_burst_len);
1299 }
1300
1301 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1302 /*
1303 * A PDU/CmdSN carrying Immediate Data passed
1304 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1305 * Immediate Bit is not set.
1306 */
1307 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1308 (unsigned char *)hdr, hdr->cmdsn);
1309 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1310 return -1;
1311
1312 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1313 target_put_sess_cmd(&cmd->se_cmd);
1314
1315 return 0;
1316 } else if (cmd->unsolicited_data)
1317 iscsit_set_unsolicited_dataout(cmd);
1318
1319 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1320 /*
1321 * Immediate Data failed DataCRC and ERL>=1,
1322 * silently drop this PDU and let the initiator
1323 * plug the CmdSN gap.
1324 *
1325 * FIXME: Send Unsolicited NOPIN with reserved
1326 * TTT here to help the initiator figure out
1327 * the missing CmdSN, although they should be
1328 * intelligent enough to determine the missing
1329 * CmdSN and issue a retry to plug the sequence.
1330 */
1331 cmd->i_state = ISTATE_REMOVE;
1332 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1333 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1334 return -1;
1335
1336 return 0;
1337 }
1338
1339 static int
1340 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1341 unsigned char *buf)
1342 {
1343 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1344 int rc, immed_data;
1345 bool dump_payload = false;
1346
1347 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1348 if (rc < 0)
1349 return 0;
1350 /*
1351 * Allocation iovecs needed for struct socket operations for
1352 * traditional iSCSI block I/O.
1353 */
1354 if (iscsit_allocate_iovecs(cmd) < 0) {
1355 return iscsit_reject_cmd(cmd,
1356 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1357 }
1358 immed_data = cmd->immediate_data;
1359
1360 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1361 if (rc < 0)
1362 return rc;
1363 else if (rc > 0)
1364 dump_payload = true;
1365
1366 if (!immed_data)
1367 return 0;
1368
1369 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1370 }
1371
1372 static u32 iscsit_do_crypto_hash_sg(
1373 struct ahash_request *hash,
1374 struct iscsi_cmd *cmd,
1375 u32 data_offset,
1376 u32 data_length,
1377 u32 padding,
1378 u8 *pad_bytes)
1379 {
1380 u32 data_crc;
1381 struct scatterlist *sg;
1382 unsigned int page_off;
1383
1384 crypto_ahash_init(hash);
1385
1386 sg = cmd->first_data_sg;
1387 page_off = cmd->first_data_sg_off;
1388
1389 while (data_length) {
1390 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1391
1392 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1393 crypto_ahash_update(hash);
1394
1395 data_length -= cur_len;
1396 page_off = 0;
1397 /* iscsit_map_iovec has already checked for invalid sg pointers */
1398 sg = sg_next(sg);
1399 }
1400
1401 if (padding) {
1402 struct scatterlist pad_sg;
1403
1404 sg_init_one(&pad_sg, pad_bytes, padding);
1405 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1406 padding);
1407 crypto_ahash_finup(hash);
1408 } else {
1409 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1410 crypto_ahash_final(hash);
1411 }
1412
1413 return data_crc;
1414 }
1415
1416 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1417 const void *buf, u32 payload_length, u32 padding,
1418 const void *pad_bytes, void *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 if (padding)
1425 sg_set_buf(sg + 1, pad_bytes, padding);
1426
1427 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1428
1429 crypto_ahash_digest(hash);
1430 }
1431
1432 int
1433 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1434 struct iscsi_cmd *cmd, u32 payload_length,
1435 bool *success)
1436 {
1437 struct iscsi_data *hdr = buf;
1438 struct se_cmd *se_cmd;
1439 int rc;
1440
1441 /* iSCSI write */
1442 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1443
1444 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1445 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1446 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1447 payload_length, conn->cid);
1448
1449 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1450 pr_err("Command ITT: 0x%08x received DataOUT after"
1451 " last DataOUT received, dumping payload\n",
1452 cmd->init_task_tag);
1453 return iscsit_dump_data_payload(conn, payload_length, 1);
1454 }
1455
1456 if (cmd->data_direction != DMA_TO_DEVICE) {
1457 pr_err("Command ITT: 0x%08x received DataOUT for a"
1458 " NON-WRITE command.\n", cmd->init_task_tag);
1459 return iscsit_dump_data_payload(conn, payload_length, 1);
1460 }
1461 se_cmd = &cmd->se_cmd;
1462 iscsit_mod_dataout_timer(cmd);
1463
1464 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1465 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1466 be32_to_cpu(hdr->offset), payload_length,
1467 cmd->se_cmd.data_length);
1468 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1469 }
1470
1471 if (cmd->unsolicited_data) {
1472 int dump_unsolicited_data = 0;
1473
1474 if (conn->sess->sess_ops->InitialR2T) {
1475 pr_err("Received unexpected unsolicited data"
1476 " while InitialR2T=Yes, protocol error.\n");
1477 transport_send_check_condition_and_sense(&cmd->se_cmd,
1478 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1479 return -1;
1480 }
1481 /*
1482 * Special case for dealing with Unsolicited DataOUT
1483 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1484 * failures;
1485 */
1486
1487 /* Something's amiss if we're not in WRITE_PENDING state... */
1488 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1489 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1490 dump_unsolicited_data = 1;
1491
1492 if (dump_unsolicited_data) {
1493 /*
1494 * Check if a delayed TASK_ABORTED status needs to
1495 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1496 * received with the unsolicited data out.
1497 */
1498 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1499 iscsit_stop_dataout_timer(cmd);
1500
1501 return iscsit_dump_data_payload(conn, payload_length, 1);
1502 }
1503 } else {
1504 /*
1505 * For the normal solicited data path:
1506 *
1507 * Check for a delayed TASK_ABORTED status and dump any
1508 * incoming data out payload if one exists. Also, when the
1509 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1510 * data out sequence, we decrement outstanding_r2ts. Once
1511 * outstanding_r2ts reaches zero, go ahead and send the delayed
1512 * TASK_ABORTED status.
1513 */
1514 if (se_cmd->transport_state & CMD_T_ABORTED) {
1515 if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1516 --cmd->outstanding_r2ts < 1)
1517 iscsit_stop_dataout_timer(cmd);
1518
1519 return iscsit_dump_data_payload(conn, payload_length, 1);
1520 }
1521 }
1522 /*
1523 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1524 * within-command recovery checks before receiving the payload.
1525 */
1526 rc = iscsit_check_pre_dataout(cmd, buf);
1527 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1528 return 0;
1529 else if (rc == DATAOUT_CANNOT_RECOVER)
1530 return -1;
1531 *success = true;
1532 return 0;
1533 }
1534 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1535
1536 int
1537 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1538 struct iscsi_cmd **out_cmd)
1539 {
1540 struct iscsi_data *hdr = buf;
1541 struct iscsi_cmd *cmd;
1542 u32 payload_length = ntoh24(hdr->dlength);
1543 int rc;
1544 bool success = false;
1545
1546 if (!payload_length) {
1547 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1548 return 0;
1549 }
1550
1551 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1552 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1553 " MaxXmitDataSegmentLength: %u\n", payload_length,
1554 conn->conn_ops->MaxXmitDataSegmentLength);
1555 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1556 }
1557
1558 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1559 if (!cmd)
1560 return 0;
1561
1562 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1563
1564 if (success)
1565 *out_cmd = cmd;
1566
1567 return rc;
1568 }
1569 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1570
1571 static int
1572 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1573 struct iscsi_data *hdr)
1574 {
1575 struct kvec *iov;
1576 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1577 u32 payload_length;
1578 int iov_ret, data_crc_failed = 0;
1579
1580 payload_length = min_t(u32, cmd->se_cmd.data_length,
1581 ntoh24(hdr->dlength));
1582 rx_size += payload_length;
1583 iov = &cmd->iov_data[0];
1584
1585 iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2,
1586 be32_to_cpu(hdr->offset), payload_length);
1587 if (iov_ret < 0)
1588 return -1;
1589
1590 iov_count += iov_ret;
1591
1592 padding = ((-payload_length) & 3);
1593 if (padding != 0) {
1594 iov[iov_count].iov_base = cmd->pad_bytes;
1595 iov[iov_count++].iov_len = padding;
1596 rx_size += padding;
1597 pr_debug("Receiving %u padding bytes.\n", padding);
1598 }
1599
1600 if (conn->conn_ops->DataDigest) {
1601 iov[iov_count].iov_base = &checksum;
1602 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1603 rx_size += ISCSI_CRC_LEN;
1604 }
1605
1606 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
1607 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1608
1609 iscsit_unmap_iovec(cmd);
1610
1611 if (rx_got != rx_size)
1612 return -1;
1613
1614 if (conn->conn_ops->DataDigest) {
1615 u32 data_crc;
1616
1617 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1618 be32_to_cpu(hdr->offset),
1619 payload_length, padding,
1620 cmd->pad_bytes);
1621
1622 if (checksum != data_crc) {
1623 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1624 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1625 " does not match computed 0x%08x\n",
1626 hdr->itt, hdr->offset, payload_length,
1627 hdr->datasn, checksum, data_crc);
1628 data_crc_failed = 1;
1629 } else {
1630 pr_debug("Got CRC32C DataDigest 0x%08x for"
1631 " %u bytes of Data Out\n", checksum,
1632 payload_length);
1633 }
1634 }
1635
1636 return data_crc_failed;
1637 }
1638
1639 int
1640 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1641 bool data_crc_failed)
1642 {
1643 struct iscsi_conn *conn = cmd->conn;
1644 int rc, ooo_cmdsn;
1645 /*
1646 * Increment post receive data and CRC values or perform
1647 * within-command recovery.
1648 */
1649 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1650 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1651 return 0;
1652 else if (rc == DATAOUT_SEND_R2T) {
1653 iscsit_set_dataout_sequence_values(cmd);
1654 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1655 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1656 /*
1657 * Handle extra special case for out of order
1658 * Unsolicited Data Out.
1659 */
1660 spin_lock_bh(&cmd->istate_lock);
1661 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1662 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1663 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1664 spin_unlock_bh(&cmd->istate_lock);
1665
1666 iscsit_stop_dataout_timer(cmd);
1667 if (ooo_cmdsn)
1668 return 0;
1669 target_execute_cmd(&cmd->se_cmd);
1670 return 0;
1671 } else /* DATAOUT_CANNOT_RECOVER */
1672 return -1;
1673
1674 return 0;
1675 }
1676 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1677
1678 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1679 {
1680 struct iscsi_cmd *cmd = NULL;
1681 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1682 int rc;
1683 bool data_crc_failed = false;
1684
1685 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1686 if (rc < 0)
1687 return 0;
1688 else if (!cmd)
1689 return 0;
1690
1691 rc = iscsit_get_dataout(conn, cmd, hdr);
1692 if (rc < 0)
1693 return rc;
1694 else if (rc > 0)
1695 data_crc_failed = true;
1696
1697 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1698 }
1699
1700 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1701 struct iscsi_nopout *hdr)
1702 {
1703 u32 payload_length = ntoh24(hdr->dlength);
1704
1705 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1706 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1707 if (!cmd)
1708 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1709 (unsigned char *)hdr);
1710
1711 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1712 (unsigned char *)hdr);
1713 }
1714
1715 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1716 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1717 " not set, protocol error.\n");
1718 if (!cmd)
1719 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1720 (unsigned char *)hdr);
1721
1722 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1723 (unsigned char *)hdr);
1724 }
1725
1726 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1727 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1728 " greater than MaxXmitDataSegmentLength: %u, protocol"
1729 " error.\n", payload_length,
1730 conn->conn_ops->MaxXmitDataSegmentLength);
1731 if (!cmd)
1732 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1733 (unsigned char *)hdr);
1734
1735 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1736 (unsigned char *)hdr);
1737 }
1738
1739 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1740 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1741 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1742 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1743 payload_length);
1744 /*
1745 * This is not a response to a Unsolicited NopIN, which means
1746 * it can either be a NOPOUT ping request (with a valid ITT),
1747 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1748 * Either way, make sure we allocate an struct iscsi_cmd, as both
1749 * can contain ping data.
1750 */
1751 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1752 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1753 cmd->i_state = ISTATE_SEND_NOPIN;
1754 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1755 1 : 0);
1756 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1757 cmd->targ_xfer_tag = 0xFFFFFFFF;
1758 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1759 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1760 cmd->data_direction = DMA_NONE;
1761 }
1762
1763 return 0;
1764 }
1765 EXPORT_SYMBOL(iscsit_setup_nop_out);
1766
1767 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1768 struct iscsi_nopout *hdr)
1769 {
1770 struct iscsi_cmd *cmd_p = NULL;
1771 int cmdsn_ret = 0;
1772 /*
1773 * Initiator is expecting a NopIN ping reply..
1774 */
1775 if (hdr->itt != RESERVED_ITT) {
1776 if (!cmd)
1777 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1778 (unsigned char *)hdr);
1779
1780 spin_lock_bh(&conn->cmd_lock);
1781 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1782 spin_unlock_bh(&conn->cmd_lock);
1783
1784 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1785
1786 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1787 iscsit_add_cmd_to_response_queue(cmd, conn,
1788 cmd->i_state);
1789 return 0;
1790 }
1791
1792 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1793 (unsigned char *)hdr, hdr->cmdsn);
1794 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1795 return 0;
1796 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1797 return -1;
1798
1799 return 0;
1800 }
1801 /*
1802 * This was a response to a unsolicited NOPIN ping.
1803 */
1804 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1805 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1806 if (!cmd_p)
1807 return -EINVAL;
1808
1809 iscsit_stop_nopin_response_timer(conn);
1810
1811 cmd_p->i_state = ISTATE_REMOVE;
1812 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1813
1814 iscsit_start_nopin_timer(conn);
1815 return 0;
1816 }
1817 /*
1818 * Otherwise, initiator is not expecting a NOPIN is response.
1819 * Just ignore for now.
1820 */
1821
1822 if (cmd)
1823 iscsit_free_cmd(cmd, false);
1824
1825 return 0;
1826 }
1827 EXPORT_SYMBOL(iscsit_process_nop_out);
1828
1829 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1830 unsigned char *buf)
1831 {
1832 unsigned char *ping_data = NULL;
1833 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1834 struct kvec *iov = NULL;
1835 u32 payload_length = ntoh24(hdr->dlength);
1836 int ret;
1837
1838 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1839 if (ret < 0)
1840 return 0;
1841 /*
1842 * Handle NOP-OUT payload for traditional iSCSI sockets
1843 */
1844 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1845 u32 checksum, data_crc, padding = 0;
1846 int niov = 0, rx_got, rx_size = payload_length;
1847
1848 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1849 if (!ping_data) {
1850 ret = -1;
1851 goto out;
1852 }
1853
1854 iov = &cmd->iov_misc[0];
1855 iov[niov].iov_base = ping_data;
1856 iov[niov++].iov_len = payload_length;
1857
1858 padding = ((-payload_length) & 3);
1859 if (padding != 0) {
1860 pr_debug("Receiving %u additional bytes"
1861 " for padding.\n", padding);
1862 iov[niov].iov_base = &cmd->pad_bytes;
1863 iov[niov++].iov_len = padding;
1864 rx_size += padding;
1865 }
1866 if (conn->conn_ops->DataDigest) {
1867 iov[niov].iov_base = &checksum;
1868 iov[niov++].iov_len = ISCSI_CRC_LEN;
1869 rx_size += ISCSI_CRC_LEN;
1870 }
1871
1872 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc));
1873 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1874 if (rx_got != rx_size) {
1875 ret = -1;
1876 goto out;
1877 }
1878
1879 if (conn->conn_ops->DataDigest) {
1880 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1881 payload_length, padding,
1882 cmd->pad_bytes, &data_crc);
1883
1884 if (checksum != data_crc) {
1885 pr_err("Ping data CRC32C DataDigest"
1886 " 0x%08x does not match computed 0x%08x\n",
1887 checksum, data_crc);
1888 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1889 pr_err("Unable to recover from"
1890 " NOPOUT Ping DataCRC failure while in"
1891 " ERL=0.\n");
1892 ret = -1;
1893 goto out;
1894 } else {
1895 /*
1896 * Silently drop this PDU and let the
1897 * initiator plug the CmdSN gap.
1898 */
1899 pr_debug("Dropping NOPOUT"
1900 " Command CmdSN: 0x%08x due to"
1901 " DataCRC error.\n", hdr->cmdsn);
1902 ret = 0;
1903 goto out;
1904 }
1905 } else {
1906 pr_debug("Got CRC32C DataDigest"
1907 " 0x%08x for %u bytes of ping data.\n",
1908 checksum, payload_length);
1909 }
1910 }
1911
1912 ping_data[payload_length] = '\0';
1913 /*
1914 * Attach ping data to struct iscsi_cmd->buf_ptr.
1915 */
1916 cmd->buf_ptr = ping_data;
1917 cmd->buf_ptr_size = payload_length;
1918
1919 pr_debug("Got %u bytes of NOPOUT ping"
1920 " data.\n", payload_length);
1921 pr_debug("Ping Data: \"%s\"\n", ping_data);
1922 }
1923
1924 return iscsit_process_nop_out(conn, cmd, hdr);
1925 out:
1926 if (cmd)
1927 iscsit_free_cmd(cmd, false);
1928
1929 kfree(ping_data);
1930 return ret;
1931 }
1932
1933 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1934 {
1935 switch (iscsi_tmf) {
1936 case ISCSI_TM_FUNC_ABORT_TASK:
1937 return TMR_ABORT_TASK;
1938 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1939 return TMR_ABORT_TASK_SET;
1940 case ISCSI_TM_FUNC_CLEAR_ACA:
1941 return TMR_CLEAR_ACA;
1942 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1943 return TMR_CLEAR_TASK_SET;
1944 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1945 return TMR_LUN_RESET;
1946 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1947 return TMR_TARGET_WARM_RESET;
1948 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1949 return TMR_TARGET_COLD_RESET;
1950 default:
1951 return TMR_UNKNOWN;
1952 }
1953 }
1954
1955 int
1956 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1957 unsigned char *buf)
1958 {
1959 struct se_tmr_req *se_tmr;
1960 struct iscsi_tmr_req *tmr_req;
1961 struct iscsi_tm *hdr;
1962 int out_of_order_cmdsn = 0, ret;
1963 u8 function, tcm_function = TMR_UNKNOWN;
1964
1965 hdr = (struct iscsi_tm *) buf;
1966 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1967 function = hdr->flags;
1968
1969 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1970 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1971 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1972 hdr->rtt, hdr->refcmdsn, conn->cid);
1973
1974 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1975 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1976 hdr->rtt != RESERVED_ITT)) {
1977 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1978 hdr->rtt = RESERVED_ITT;
1979 }
1980
1981 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1982 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1983 pr_err("Task Management Request TASK_REASSIGN not"
1984 " issued as immediate command, bad iSCSI Initiator"
1985 "implementation\n");
1986 return iscsit_add_reject_cmd(cmd,
1987 ISCSI_REASON_PROTOCOL_ERROR, buf);
1988 }
1989 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1990 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1991 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1992
1993 cmd->data_direction = DMA_NONE;
1994 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1995 if (!cmd->tmr_req) {
1996 return iscsit_add_reject_cmd(cmd,
1997 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1998 buf);
1999 }
2000
2001 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2002 conn->sess->se_sess, 0, DMA_NONE,
2003 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2004
2005 target_get_sess_cmd(&cmd->se_cmd, true);
2006
2007 /*
2008 * TASK_REASSIGN for ERL=2 / connection stays inside of
2009 * LIO-Target $FABRIC_MOD
2010 */
2011 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2012 tcm_function = iscsit_convert_tmf(function);
2013 if (tcm_function == TMR_UNKNOWN) {
2014 pr_err("Unknown iSCSI TMR Function:"
2015 " 0x%02x\n", function);
2016 return iscsit_add_reject_cmd(cmd,
2017 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2018 }
2019 }
2020 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2021 GFP_KERNEL);
2022 if (ret < 0)
2023 return iscsit_add_reject_cmd(cmd,
2024 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2025
2026 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2027
2028 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2029 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2030 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2031 cmd->init_task_tag = hdr->itt;
2032 cmd->targ_xfer_tag = 0xFFFFFFFF;
2033 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2034 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2035 se_tmr = cmd->se_cmd.se_tmr_req;
2036 tmr_req = cmd->tmr_req;
2037 /*
2038 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2039 */
2040 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2041 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2042 scsilun_to_int(&hdr->lun));
2043 if (ret < 0) {
2044 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2045 goto attach;
2046 }
2047 }
2048
2049 switch (function) {
2050 case ISCSI_TM_FUNC_ABORT_TASK:
2051 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2052 if (se_tmr->response)
2053 goto attach;
2054 break;
2055 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2056 case ISCSI_TM_FUNC_CLEAR_ACA:
2057 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2058 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2059 break;
2060 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2061 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2062 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2063 goto attach;
2064 }
2065 break;
2066 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2067 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2068 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2069 goto attach;
2070 }
2071 break;
2072 case ISCSI_TM_FUNC_TASK_REASSIGN:
2073 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2074 /*
2075 * Perform sanity checks on the ExpDataSN only if the
2076 * TASK_REASSIGN was successful.
2077 */
2078 if (se_tmr->response)
2079 break;
2080
2081 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2082 return iscsit_add_reject_cmd(cmd,
2083 ISCSI_REASON_BOOKMARK_INVALID, buf);
2084 break;
2085 default:
2086 pr_err("Unknown TMR function: 0x%02x, protocol"
2087 " error.\n", function);
2088 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2089 goto attach;
2090 }
2091
2092 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2093 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2094 se_tmr->call_transport = 1;
2095 attach:
2096 spin_lock_bh(&conn->cmd_lock);
2097 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2098 spin_unlock_bh(&conn->cmd_lock);
2099
2100 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2101 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2102 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2103 out_of_order_cmdsn = 1;
2104 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2105 target_put_sess_cmd(&cmd->se_cmd);
2106 return 0;
2107 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2108 return -1;
2109 }
2110 }
2111 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2112
2113 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2114 return 0;
2115 /*
2116 * Found the referenced task, send to transport for processing.
2117 */
2118 if (se_tmr->call_transport)
2119 return transport_generic_handle_tmr(&cmd->se_cmd);
2120
2121 /*
2122 * Could not find the referenced LUN, task, or Task Management
2123 * command not authorized or supported. Change state and
2124 * let the tx_thread send the response.
2125 *
2126 * For connection recovery, this is also the default action for
2127 * TMR TASK_REASSIGN.
2128 */
2129 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2130 target_put_sess_cmd(&cmd->se_cmd);
2131 return 0;
2132 }
2133 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2134
2135 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2136 int
2137 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2138 struct iscsi_text *hdr)
2139 {
2140 u32 payload_length = ntoh24(hdr->dlength);
2141
2142 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2143 pr_err("Unable to accept text parameter length: %u"
2144 "greater than MaxXmitDataSegmentLength %u.\n",
2145 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2146 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2147 (unsigned char *)hdr);
2148 }
2149
2150 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2151 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2152 pr_err("Multi sequence text commands currently not supported\n");
2153 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2154 (unsigned char *)hdr);
2155 }
2156
2157 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2158 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2159 hdr->exp_statsn, payload_length);
2160
2161 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2162 cmd->i_state = ISTATE_SEND_TEXTRSP;
2163 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2164 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2165 cmd->targ_xfer_tag = 0xFFFFFFFF;
2166 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2167 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2168 cmd->data_direction = DMA_NONE;
2169 kfree(cmd->text_in_ptr);
2170 cmd->text_in_ptr = NULL;
2171
2172 return 0;
2173 }
2174 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2175
2176 int
2177 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2178 struct iscsi_text *hdr)
2179 {
2180 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2181 int cmdsn_ret;
2182
2183 if (!text_in) {
2184 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2185 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2186 pr_err("Unable to locate text_in buffer for sendtargets"
2187 " discovery\n");
2188 goto reject;
2189 }
2190 goto empty_sendtargets;
2191 }
2192 if (strncmp("SendTargets=", text_in, 12) != 0) {
2193 pr_err("Received Text Data that is not"
2194 " SendTargets, cannot continue.\n");
2195 goto reject;
2196 }
2197 /* '=' confirmed in strncmp */
2198 text_ptr = strchr(text_in, '=');
2199 BUG_ON(!text_ptr);
2200 if (!strncmp("=All", text_ptr, 5)) {
2201 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2202 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2203 !strncmp("=eui.", text_ptr, 5)) {
2204 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2205 } else {
2206 pr_err("Unable to locate valid SendTargets%s value\n",
2207 text_ptr);
2208 goto reject;
2209 }
2210
2211 spin_lock_bh(&conn->cmd_lock);
2212 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2213 spin_unlock_bh(&conn->cmd_lock);
2214
2215 empty_sendtargets:
2216 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2217
2218 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2219 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2220 (unsigned char *)hdr, hdr->cmdsn);
2221 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2222 return -1;
2223
2224 return 0;
2225 }
2226
2227 return iscsit_execute_cmd(cmd, 0);
2228
2229 reject:
2230 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2231 (unsigned char *)hdr);
2232 }
2233 EXPORT_SYMBOL(iscsit_process_text_cmd);
2234
2235 static int
2236 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2237 unsigned char *buf)
2238 {
2239 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2240 char *text_in = NULL;
2241 u32 payload_length = ntoh24(hdr->dlength);
2242 int rx_size, rc;
2243
2244 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2245 if (rc < 0)
2246 return 0;
2247
2248 rx_size = payload_length;
2249 if (payload_length) {
2250 u32 checksum = 0, data_crc = 0;
2251 u32 padding = 0;
2252 int niov = 0, rx_got;
2253 struct kvec iov[2];
2254
2255 rx_size = ALIGN(payload_length, 4);
2256 text_in = kzalloc(rx_size, GFP_KERNEL);
2257 if (!text_in)
2258 goto reject;
2259
2260 cmd->text_in_ptr = text_in;
2261
2262 memset(iov, 0, sizeof(iov));
2263 iov[niov].iov_base = text_in;
2264 iov[niov++].iov_len = rx_size;
2265
2266 padding = rx_size - payload_length;
2267 if (padding)
2268 pr_debug("Receiving %u additional bytes"
2269 " for padding.\n", padding);
2270 if (conn->conn_ops->DataDigest) {
2271 iov[niov].iov_base = &checksum;
2272 iov[niov++].iov_len = ISCSI_CRC_LEN;
2273 rx_size += ISCSI_CRC_LEN;
2274 }
2275
2276 WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
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, rx_size, 0, NULL,
2284 &data_crc);
2285
2286 if (checksum != data_crc) {
2287 pr_err("Text data CRC32C DataDigest"
2288 " 0x%08x does not match computed"
2289 " 0x%08x\n", checksum, data_crc);
2290 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2291 pr_err("Unable to recover from"
2292 " Text Data digest failure while in"
2293 " ERL=0.\n");
2294 goto reject;
2295 } else {
2296 /*
2297 * Silently drop this PDU and let the
2298 * initiator plug the CmdSN gap.
2299 */
2300 pr_debug("Dropping Text"
2301 " Command CmdSN: 0x%08x due to"
2302 " DataCRC error.\n", hdr->cmdsn);
2303 kfree(text_in);
2304 return 0;
2305 }
2306 } else {
2307 pr_debug("Got CRC32C DataDigest"
2308 " 0x%08x for %u bytes of text data.\n",
2309 checksum, payload_length);
2310 }
2311 }
2312 text_in[payload_length - 1] = '\0';
2313 pr_debug("Successfully read %d bytes of text"
2314 " data.\n", payload_length);
2315 }
2316
2317 return iscsit_process_text_cmd(conn, cmd, hdr);
2318
2319 reject:
2320 kfree(cmd->text_in_ptr);
2321 cmd->text_in_ptr = NULL;
2322 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2323 }
2324
2325 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2326 {
2327 struct iscsi_conn *conn_p;
2328 struct iscsi_session *sess = conn->sess;
2329
2330 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2331 " for SID: %u.\n", conn->cid, conn->sess->sid);
2332
2333 atomic_set(&sess->session_logout, 1);
2334 atomic_set(&conn->conn_logout_remove, 1);
2335 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2336
2337 iscsit_inc_conn_usage_count(conn);
2338 iscsit_inc_session_usage_count(sess);
2339
2340 spin_lock_bh(&sess->conn_lock);
2341 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2342 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2343 continue;
2344
2345 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2346 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2347 }
2348 spin_unlock_bh(&sess->conn_lock);
2349
2350 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2351
2352 return 0;
2353 }
2354
2355 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2356 {
2357 struct iscsi_conn *l_conn;
2358 struct iscsi_session *sess = conn->sess;
2359
2360 pr_debug("Received logout request CLOSECONNECTION for CID:"
2361 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2362
2363 /*
2364 * A Logout Request with a CLOSECONNECTION reason code for a CID
2365 * can arrive on a connection with a differing CID.
2366 */
2367 if (conn->cid == cmd->logout_cid) {
2368 spin_lock_bh(&conn->state_lock);
2369 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2370 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2371
2372 atomic_set(&conn->conn_logout_remove, 1);
2373 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2374 iscsit_inc_conn_usage_count(conn);
2375
2376 spin_unlock_bh(&conn->state_lock);
2377 } else {
2378 /*
2379 * Handle all different cid CLOSECONNECTION requests in
2380 * iscsit_logout_post_handler_diffcid() as to give enough
2381 * time for any non immediate command's CmdSN to be
2382 * acknowledged on the connection in question.
2383 *
2384 * Here we simply make sure the CID is still around.
2385 */
2386 l_conn = iscsit_get_conn_from_cid(sess,
2387 cmd->logout_cid);
2388 if (!l_conn) {
2389 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2390 iscsit_add_cmd_to_response_queue(cmd, conn,
2391 cmd->i_state);
2392 return 0;
2393 }
2394
2395 iscsit_dec_conn_usage_count(l_conn);
2396 }
2397
2398 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2399
2400 return 0;
2401 }
2402
2403 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2404 {
2405 struct iscsi_session *sess = conn->sess;
2406
2407 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2408 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2409
2410 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2411 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2412 " while ERL!=2.\n");
2413 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2414 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2415 return 0;
2416 }
2417
2418 if (conn->cid == cmd->logout_cid) {
2419 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2420 " with CID: %hu on CID: %hu, implementation error.\n",
2421 cmd->logout_cid, conn->cid);
2422 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2423 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2424 return 0;
2425 }
2426
2427 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2428
2429 return 0;
2430 }
2431
2432 int
2433 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2434 unsigned char *buf)
2435 {
2436 int cmdsn_ret, logout_remove = 0;
2437 u8 reason_code = 0;
2438 struct iscsi_logout *hdr;
2439 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2440
2441 hdr = (struct iscsi_logout *) buf;
2442 reason_code = (hdr->flags & 0x7f);
2443
2444 if (tiqn) {
2445 spin_lock(&tiqn->logout_stats.lock);
2446 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2447 tiqn->logout_stats.normal_logouts++;
2448 else
2449 tiqn->logout_stats.abnormal_logouts++;
2450 spin_unlock(&tiqn->logout_stats.lock);
2451 }
2452
2453 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2454 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2455 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2456 hdr->cid, conn->cid);
2457
2458 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2459 pr_err("Received logout request on connection that"
2460 " is not in logged in state, ignoring request.\n");
2461 iscsit_free_cmd(cmd, false);
2462 return 0;
2463 }
2464
2465 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2466 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2467 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2468 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2469 cmd->targ_xfer_tag = 0xFFFFFFFF;
2470 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2471 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2472 cmd->logout_cid = be16_to_cpu(hdr->cid);
2473 cmd->logout_reason = reason_code;
2474 cmd->data_direction = DMA_NONE;
2475
2476 /*
2477 * We need to sleep in these cases (by returning 1) until the Logout
2478 * Response gets sent in the tx thread.
2479 */
2480 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2481 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2482 be16_to_cpu(hdr->cid) == conn->cid))
2483 logout_remove = 1;
2484
2485 spin_lock_bh(&conn->cmd_lock);
2486 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2487 spin_unlock_bh(&conn->cmd_lock);
2488
2489 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2490 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2491
2492 /*
2493 * Immediate commands are executed, well, immediately.
2494 * Non-Immediate Logout Commands are executed in CmdSN order.
2495 */
2496 if (cmd->immediate_cmd) {
2497 int ret = iscsit_execute_cmd(cmd, 0);
2498
2499 if (ret < 0)
2500 return ret;
2501 } else {
2502 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2503 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2504 logout_remove = 0;
2505 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2506 return -1;
2507 }
2508
2509 return logout_remove;
2510 }
2511 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2512
2513 int iscsit_handle_snack(
2514 struct iscsi_conn *conn,
2515 unsigned char *buf)
2516 {
2517 struct iscsi_snack *hdr;
2518
2519 hdr = (struct iscsi_snack *) buf;
2520 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2521
2522 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2523 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2524 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2525 hdr->begrun, hdr->runlength, conn->cid);
2526
2527 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2528 pr_err("Initiator sent SNACK request while in"
2529 " ErrorRecoveryLevel=0.\n");
2530 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2531 buf);
2532 }
2533 /*
2534 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2535 * call from inside iscsi_send_recovery_datain_or_r2t().
2536 */
2537 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2538 case 0:
2539 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2540 hdr->itt,
2541 be32_to_cpu(hdr->ttt),
2542 be32_to_cpu(hdr->begrun),
2543 be32_to_cpu(hdr->runlength));
2544 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2545 return iscsit_handle_status_snack(conn, hdr->itt,
2546 be32_to_cpu(hdr->ttt),
2547 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2548 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2549 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2550 be32_to_cpu(hdr->begrun),
2551 be32_to_cpu(hdr->runlength));
2552 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2553 /* FIXME: Support R-Data SNACK */
2554 pr_err("R-Data SNACK Not Supported.\n");
2555 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2556 buf);
2557 default:
2558 pr_err("Unknown SNACK type 0x%02x, protocol"
2559 " error.\n", hdr->flags & 0x0f);
2560 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2561 buf);
2562 }
2563
2564 return 0;
2565 }
2566 EXPORT_SYMBOL(iscsit_handle_snack);
2567
2568 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2569 {
2570 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2571 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2572 wait_for_completion_interruptible_timeout(
2573 &conn->rx_half_close_comp,
2574 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2575 }
2576 }
2577
2578 static int iscsit_handle_immediate_data(
2579 struct iscsi_cmd *cmd,
2580 struct iscsi_scsi_req *hdr,
2581 u32 length)
2582 {
2583 int iov_ret, rx_got = 0, rx_size = 0;
2584 u32 checksum, iov_count = 0, padding = 0;
2585 struct iscsi_conn *conn = cmd->conn;
2586 struct kvec *iov;
2587 void *overflow_buf = NULL;
2588
2589 BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
2590 rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
2591 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
2592 cmd->orig_iov_data_count - 2,
2593 cmd->write_data_done, rx_size);
2594 if (iov_ret < 0)
2595 return IMMEDIATE_DATA_CANNOT_RECOVER;
2596
2597 iov_count = iov_ret;
2598 iov = &cmd->iov_data[0];
2599 if (rx_size < length) {
2600 /*
2601 * Special case: length of immediate data exceeds the data
2602 * buffer size derived from the CDB.
2603 */
2604 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
2605 if (!overflow_buf) {
2606 iscsit_unmap_iovec(cmd);
2607 return IMMEDIATE_DATA_CANNOT_RECOVER;
2608 }
2609 cmd->overflow_buf = overflow_buf;
2610 iov[iov_count].iov_base = overflow_buf;
2611 iov[iov_count].iov_len = length - rx_size;
2612 iov_count++;
2613 rx_size = length;
2614 }
2615
2616 padding = ((-length) & 3);
2617 if (padding != 0) {
2618 iov[iov_count].iov_base = cmd->pad_bytes;
2619 iov[iov_count++].iov_len = padding;
2620 rx_size += padding;
2621 }
2622
2623 if (conn->conn_ops->DataDigest) {
2624 iov[iov_count].iov_base = &checksum;
2625 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2626 rx_size += ISCSI_CRC_LEN;
2627 }
2628
2629 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
2630 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2631
2632 iscsit_unmap_iovec(cmd);
2633
2634 if (rx_got != rx_size) {
2635 iscsit_rx_thread_wait_for_tcp(conn);
2636 return IMMEDIATE_DATA_CANNOT_RECOVER;
2637 }
2638
2639 if (conn->conn_ops->DataDigest) {
2640 u32 data_crc;
2641
2642 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2643 cmd->write_data_done, length, padding,
2644 cmd->pad_bytes);
2645
2646 if (checksum != data_crc) {
2647 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2648 " does not match computed 0x%08x\n", checksum,
2649 data_crc);
2650
2651 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2652 pr_err("Unable to recover from"
2653 " Immediate Data digest failure while"
2654 " in ERL=0.\n");
2655 iscsit_reject_cmd(cmd,
2656 ISCSI_REASON_DATA_DIGEST_ERROR,
2657 (unsigned char *)hdr);
2658 return IMMEDIATE_DATA_CANNOT_RECOVER;
2659 } else {
2660 iscsit_reject_cmd(cmd,
2661 ISCSI_REASON_DATA_DIGEST_ERROR,
2662 (unsigned char *)hdr);
2663 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2664 }
2665 } else {
2666 pr_debug("Got CRC32C DataDigest 0x%08x for"
2667 " %u bytes of Immediate Data\n", checksum,
2668 length);
2669 }
2670 }
2671
2672 cmd->write_data_done += length;
2673
2674 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2675 spin_lock_bh(&cmd->istate_lock);
2676 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2677 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2678 spin_unlock_bh(&cmd->istate_lock);
2679 }
2680
2681 return IMMEDIATE_DATA_NORMAL_OPERATION;
2682 }
2683
2684 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2685 with active network interface */
2686 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2687 {
2688 struct iscsi_cmd *cmd;
2689 struct iscsi_conn *conn_p;
2690 bool found = false;
2691
2692 lockdep_assert_held(&conn->sess->conn_lock);
2693
2694 /*
2695 * Only send a Asynchronous Message on connections whos network
2696 * interface is still functional.
2697 */
2698 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2699 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2700 iscsit_inc_conn_usage_count(conn_p);
2701 found = true;
2702 break;
2703 }
2704 }
2705
2706 if (!found)
2707 return;
2708
2709 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2710 if (!cmd) {
2711 iscsit_dec_conn_usage_count(conn_p);
2712 return;
2713 }
2714
2715 cmd->logout_cid = conn->cid;
2716 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2717 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2718
2719 spin_lock_bh(&conn_p->cmd_lock);
2720 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2721 spin_unlock_bh(&conn_p->cmd_lock);
2722
2723 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2724 iscsit_dec_conn_usage_count(conn_p);
2725 }
2726
2727 static int iscsit_send_conn_drop_async_message(
2728 struct iscsi_cmd *cmd,
2729 struct iscsi_conn *conn)
2730 {
2731 struct iscsi_async *hdr;
2732
2733 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2734
2735 hdr = (struct iscsi_async *) cmd->pdu;
2736 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2737 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2738 cmd->init_task_tag = RESERVED_ITT;
2739 cmd->targ_xfer_tag = 0xFFFFFFFF;
2740 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2741 cmd->stat_sn = conn->stat_sn++;
2742 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2743 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2744 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2745 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2746 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2747 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2748 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2749
2750 pr_debug("Sending Connection Dropped Async Message StatSN:"
2751 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2752 cmd->logout_cid, conn->cid);
2753
2754 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2755 }
2756
2757 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2758 {
2759 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2760 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2761 wait_for_completion_interruptible_timeout(
2762 &conn->tx_half_close_comp,
2763 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2764 }
2765 }
2766
2767 void
2768 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2769 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2770 bool set_statsn)
2771 {
2772 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2773 hdr->flags = datain->flags;
2774 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2775 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2776 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2777 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2778 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2779 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2780 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2781 }
2782 }
2783 hton24(hdr->dlength, datain->length);
2784 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2785 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2786 (struct scsi_lun *)&hdr->lun);
2787 else
2788 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2789
2790 hdr->itt = cmd->init_task_tag;
2791
2792 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2793 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2794 else
2795 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2796 if (set_statsn)
2797 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2798 else
2799 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2800
2801 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2802 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2803 hdr->datasn = cpu_to_be32(datain->data_sn);
2804 hdr->offset = cpu_to_be32(datain->offset);
2805
2806 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2807 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2808 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2809 ntohl(hdr->offset), datain->length, conn->cid);
2810 }
2811 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2812
2813 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2814 {
2815 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2816 struct iscsi_datain datain;
2817 struct iscsi_datain_req *dr;
2818 int eodr = 0, ret;
2819 bool set_statsn = false;
2820
2821 memset(&datain, 0, sizeof(struct iscsi_datain));
2822 dr = iscsit_get_datain_values(cmd, &datain);
2823 if (!dr) {
2824 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2825 cmd->init_task_tag);
2826 return -1;
2827 }
2828 /*
2829 * Be paranoid and double check the logic for now.
2830 */
2831 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2832 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2833 " datain.length: %u exceeds cmd->data_length: %u\n",
2834 cmd->init_task_tag, datain.offset, datain.length,
2835 cmd->se_cmd.data_length);
2836 return -1;
2837 }
2838
2839 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2840 /*
2841 * Special case for successfully execution w/ both DATAIN
2842 * and Sense Data.
2843 */
2844 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2845 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2846 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2847 else {
2848 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2849 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2850 iscsit_increment_maxcmdsn(cmd, conn->sess);
2851 cmd->stat_sn = conn->stat_sn++;
2852 set_statsn = true;
2853 } else if (dr->dr_complete ==
2854 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2855 set_statsn = true;
2856 }
2857
2858 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2859
2860 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2861 if (ret < 0)
2862 return ret;
2863
2864 if (dr->dr_complete) {
2865 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2866 2 : 1;
2867 iscsit_free_datain_req(cmd, dr);
2868 }
2869
2870 return eodr;
2871 }
2872
2873 int
2874 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2875 struct iscsi_logout_rsp *hdr)
2876 {
2877 struct iscsi_conn *logout_conn = NULL;
2878 struct iscsi_conn_recovery *cr = NULL;
2879 struct iscsi_session *sess = conn->sess;
2880 /*
2881 * The actual shutting down of Sessions and/or Connections
2882 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2883 * is done in scsi_logout_post_handler().
2884 */
2885 switch (cmd->logout_reason) {
2886 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2887 pr_debug("iSCSI session logout successful, setting"
2888 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2889 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2890 break;
2891 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2892 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2893 break;
2894 /*
2895 * For CLOSECONNECTION logout requests carrying
2896 * a matching logout CID -> local CID, the reference
2897 * for the local CID will have been incremented in
2898 * iscsi_logout_closeconnection().
2899 *
2900 * For CLOSECONNECTION logout requests carrying
2901 * a different CID than the connection it arrived
2902 * on, the connection responding to cmd->logout_cid
2903 * is stopped in iscsit_logout_post_handler_diffcid().
2904 */
2905
2906 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2907 " successful.\n", cmd->logout_cid, conn->cid);
2908 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2909 break;
2910 case ISCSI_LOGOUT_REASON_RECOVERY:
2911 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2912 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2913 break;
2914 /*
2915 * If the connection is still active from our point of view
2916 * force connection recovery to occur.
2917 */
2918 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2919 cmd->logout_cid);
2920 if (logout_conn) {
2921 iscsit_connection_reinstatement_rcfr(logout_conn);
2922 iscsit_dec_conn_usage_count(logout_conn);
2923 }
2924
2925 cr = iscsit_get_inactive_connection_recovery_entry(
2926 conn->sess, cmd->logout_cid);
2927 if (!cr) {
2928 pr_err("Unable to locate CID: %hu for"
2929 " REMOVECONNFORRECOVERY Logout Request.\n",
2930 cmd->logout_cid);
2931 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2932 break;
2933 }
2934
2935 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2936
2937 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2938 " for recovery for CID: %hu on CID: %hu successful.\n",
2939 cmd->logout_cid, conn->cid);
2940 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2941 break;
2942 default:
2943 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2944 cmd->logout_reason);
2945 return -1;
2946 }
2947
2948 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2949 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2950 hdr->response = cmd->logout_response;
2951 hdr->itt = cmd->init_task_tag;
2952 cmd->stat_sn = conn->stat_sn++;
2953 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2954
2955 iscsit_increment_maxcmdsn(cmd, conn->sess);
2956 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2957 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2958
2959 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2960 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2961 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2962 cmd->logout_cid, conn->cid);
2963
2964 return 0;
2965 }
2966 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2967
2968 static int
2969 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2970 {
2971 int rc;
2972
2973 rc = iscsit_build_logout_rsp(cmd, conn,
2974 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2975 if (rc < 0)
2976 return rc;
2977
2978 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2979 }
2980
2981 void
2982 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2983 struct iscsi_nopin *hdr, bool nopout_response)
2984 {
2985 hdr->opcode = ISCSI_OP_NOOP_IN;
2986 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2987 hton24(hdr->dlength, cmd->buf_ptr_size);
2988 if (nopout_response)
2989 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2990 hdr->itt = cmd->init_task_tag;
2991 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2992 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2993 conn->stat_sn;
2994 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2995
2996 if (nopout_response)
2997 iscsit_increment_maxcmdsn(cmd, conn->sess);
2998
2999 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3000 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3001
3002 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3003 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3004 "Solicited" : "Unsolicited", cmd->init_task_tag,
3005 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3006 }
3007 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3008
3009 /*
3010 * Unsolicited NOPIN, either requesting a response or not.
3011 */
3012 static int iscsit_send_unsolicited_nopin(
3013 struct iscsi_cmd *cmd,
3014 struct iscsi_conn *conn,
3015 int want_response)
3016 {
3017 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3018 int ret;
3019
3020 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3021
3022 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3023 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3024
3025 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3026 if (ret < 0)
3027 return ret;
3028
3029 spin_lock_bh(&cmd->istate_lock);
3030 cmd->i_state = want_response ?
3031 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3032 spin_unlock_bh(&cmd->istate_lock);
3033
3034 return 0;
3035 }
3036
3037 static int
3038 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3039 {
3040 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3041
3042 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3043
3044 /*
3045 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3046 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3047 */
3048 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3049
3050 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3051 cmd->buf_ptr,
3052 cmd->buf_ptr_size);
3053 }
3054
3055 static int iscsit_send_r2t(
3056 struct iscsi_cmd *cmd,
3057 struct iscsi_conn *conn)
3058 {
3059 struct iscsi_r2t *r2t;
3060 struct iscsi_r2t_rsp *hdr;
3061 int ret;
3062
3063 r2t = iscsit_get_r2t_from_list(cmd);
3064 if (!r2t)
3065 return -1;
3066
3067 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3068 memset(hdr, 0, ISCSI_HDR_LEN);
3069 hdr->opcode = ISCSI_OP_R2T;
3070 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3071 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3072 (struct scsi_lun *)&hdr->lun);
3073 hdr->itt = cmd->init_task_tag;
3074 if (conn->conn_transport->iscsit_get_r2t_ttt)
3075 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3076 else
3077 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3078 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3079 hdr->statsn = cpu_to_be32(conn->stat_sn);
3080 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3081 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3082 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3083 hdr->data_offset = cpu_to_be32(r2t->offset);
3084 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3085
3086 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3087 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3088 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3089 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3090 r2t->offset, r2t->xfer_len, conn->cid);
3091
3092 spin_lock_bh(&cmd->r2t_lock);
3093 r2t->sent_r2t = 1;
3094 spin_unlock_bh(&cmd->r2t_lock);
3095
3096 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3097 if (ret < 0) {
3098 return ret;
3099 }
3100
3101 spin_lock_bh(&cmd->dataout_timeout_lock);
3102 iscsit_start_dataout_timer(cmd, conn);
3103 spin_unlock_bh(&cmd->dataout_timeout_lock);
3104
3105 return 0;
3106 }
3107
3108 /*
3109 * @recovery: If called from iscsi_task_reassign_complete_write() for
3110 * connection recovery.
3111 */
3112 int iscsit_build_r2ts_for_cmd(
3113 struct iscsi_conn *conn,
3114 struct iscsi_cmd *cmd,
3115 bool recovery)
3116 {
3117 int first_r2t = 1;
3118 u32 offset = 0, xfer_len = 0;
3119
3120 spin_lock_bh(&cmd->r2t_lock);
3121 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3122 spin_unlock_bh(&cmd->r2t_lock);
3123 return 0;
3124 }
3125
3126 if (conn->sess->sess_ops->DataSequenceInOrder &&
3127 !recovery)
3128 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3129
3130 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3131 if (conn->sess->sess_ops->DataSequenceInOrder) {
3132 offset = cmd->r2t_offset;
3133
3134 if (first_r2t && recovery) {
3135 int new_data_end = offset +
3136 conn->sess->sess_ops->MaxBurstLength -
3137 cmd->next_burst_len;
3138
3139 if (new_data_end > cmd->se_cmd.data_length)
3140 xfer_len = cmd->se_cmd.data_length - offset;
3141 else
3142 xfer_len =
3143 conn->sess->sess_ops->MaxBurstLength -
3144 cmd->next_burst_len;
3145 } else {
3146 int new_data_end = offset +
3147 conn->sess->sess_ops->MaxBurstLength;
3148
3149 if (new_data_end > cmd->se_cmd.data_length)
3150 xfer_len = cmd->se_cmd.data_length - offset;
3151 else
3152 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3153 }
3154
3155 if ((s32)xfer_len < 0) {
3156 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3157 break;
3158 }
3159
3160 cmd->r2t_offset += xfer_len;
3161
3162 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3163 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3164 } else {
3165 struct iscsi_seq *seq;
3166
3167 seq = iscsit_get_seq_holder_for_r2t(cmd);
3168 if (!seq) {
3169 spin_unlock_bh(&cmd->r2t_lock);
3170 return -1;
3171 }
3172
3173 offset = seq->offset;
3174 xfer_len = seq->xfer_len;
3175
3176 if (cmd->seq_send_order == cmd->seq_count)
3177 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3178 }
3179 cmd->outstanding_r2ts++;
3180 first_r2t = 0;
3181
3182 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3183 spin_unlock_bh(&cmd->r2t_lock);
3184 return -1;
3185 }
3186
3187 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3188 break;
3189 }
3190 spin_unlock_bh(&cmd->r2t_lock);
3191
3192 return 0;
3193 }
3194 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3195
3196 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3197 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3198 {
3199 if (inc_stat_sn)
3200 cmd->stat_sn = conn->stat_sn++;
3201
3202 atomic_long_inc(&conn->sess->rsp_pdus);
3203
3204 memset(hdr, 0, ISCSI_HDR_LEN);
3205 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3206 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3207 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3208 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3209 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3210 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3211 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3212 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3213 }
3214 hdr->response = cmd->iscsi_response;
3215 hdr->cmd_status = cmd->se_cmd.scsi_status;
3216 hdr->itt = cmd->init_task_tag;
3217 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3218
3219 iscsit_increment_maxcmdsn(cmd, conn->sess);
3220 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3221 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3222
3223 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3224 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3225 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3226 cmd->se_cmd.scsi_status, conn->cid);
3227 }
3228 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3229
3230 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3231 {
3232 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3233 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3234 void *data_buf = NULL;
3235 u32 padding = 0, data_buf_len = 0;
3236
3237 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3238
3239 /*
3240 * Attach SENSE DATA payload to iSCSI Response PDU
3241 */
3242 if (cmd->se_cmd.sense_buffer &&
3243 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3244 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3245 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3246 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3247
3248 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3249 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3250 data_buf = cmd->sense_buffer;
3251 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3252
3253 if (padding) {
3254 memset(cmd->sense_buffer +
3255 cmd->se_cmd.scsi_sense_length, 0, padding);
3256 pr_debug("Adding %u bytes of padding to"
3257 " SENSE.\n", padding);
3258 }
3259
3260 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3261 " Response PDU\n",
3262 cmd->se_cmd.scsi_sense_length);
3263 }
3264
3265 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3266 data_buf_len);
3267 }
3268
3269 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3270 {
3271 switch (se_tmr->response) {
3272 case TMR_FUNCTION_COMPLETE:
3273 return ISCSI_TMF_RSP_COMPLETE;
3274 case TMR_TASK_DOES_NOT_EXIST:
3275 return ISCSI_TMF_RSP_NO_TASK;
3276 case TMR_LUN_DOES_NOT_EXIST:
3277 return ISCSI_TMF_RSP_NO_LUN;
3278 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3279 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3280 case TMR_FUNCTION_REJECTED:
3281 default:
3282 return ISCSI_TMF_RSP_REJECTED;
3283 }
3284 }
3285
3286 void
3287 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3288 struct iscsi_tm_rsp *hdr)
3289 {
3290 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3291
3292 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3293 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3294 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3295 hdr->itt = cmd->init_task_tag;
3296 cmd->stat_sn = conn->stat_sn++;
3297 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3298
3299 iscsit_increment_maxcmdsn(cmd, conn->sess);
3300 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3301 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3302
3303 pr_debug("Built Task Management Response ITT: 0x%08x,"
3304 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3305 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3306 }
3307 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3308
3309 static int
3310 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3311 {
3312 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3313
3314 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3315
3316 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3317 }
3318
3319 #define SENDTARGETS_BUF_LIMIT 32768U
3320
3321 static int
3322 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3323 enum iscsit_transport_type network_transport,
3324 int skip_bytes, bool *completed)
3325 {
3326 char *payload = NULL;
3327 struct iscsi_conn *conn = cmd->conn;
3328 struct iscsi_portal_group *tpg;
3329 struct iscsi_tiqn *tiqn;
3330 struct iscsi_tpg_np *tpg_np;
3331 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3332 int target_name_printed;
3333 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3334 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3335 bool active;
3336
3337 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3338 SENDTARGETS_BUF_LIMIT);
3339
3340 payload = kzalloc(buffer_len, GFP_KERNEL);
3341 if (!payload)
3342 return -ENOMEM;
3343
3344 /*
3345 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3346 * explicit case..
3347 */
3348 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3349 text_ptr = strchr(text_in, '=');
3350 if (!text_ptr) {
3351 pr_err("Unable to locate '=' string in text_in:"
3352 " %s\n", text_in);
3353 kfree(payload);
3354 return -EINVAL;
3355 }
3356 /*
3357 * Skip over '=' character..
3358 */
3359 text_ptr += 1;
3360 }
3361
3362 spin_lock(&tiqn_lock);
3363 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3364 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3365 strcmp(tiqn->tiqn, text_ptr)) {
3366 continue;
3367 }
3368
3369 target_name_printed = 0;
3370
3371 spin_lock(&tiqn->tiqn_tpg_lock);
3372 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3373
3374 /* If demo_mode_discovery=0 and generate_node_acls=0
3375 * (demo mode dislabed) do not return
3376 * TargetName+TargetAddress unless a NodeACL exists.
3377 */
3378
3379 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3380 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3381 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3382 cmd->conn->sess->sess_ops->InitiatorName))) {
3383 continue;
3384 }
3385
3386 spin_lock(&tpg->tpg_state_lock);
3387 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3388 spin_unlock(&tpg->tpg_state_lock);
3389
3390 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3391 continue;
3392
3393 spin_lock(&tpg->tpg_np_lock);
3394 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3395 tpg_np_list) {
3396 struct iscsi_np *np = tpg_np->tpg_np;
3397 struct sockaddr_storage *sockaddr;
3398
3399 if (np->np_network_transport != network_transport)
3400 continue;
3401
3402 if (!target_name_printed) {
3403 len = sprintf(buf, "TargetName=%s",
3404 tiqn->tiqn);
3405 len += 1;
3406
3407 if ((len + payload_len) > buffer_len) {
3408 spin_unlock(&tpg->tpg_np_lock);
3409 spin_unlock(&tiqn->tiqn_tpg_lock);
3410 end_of_buf = 1;
3411 goto eob;
3412 }
3413
3414 if (skip_bytes && len <= skip_bytes) {
3415 skip_bytes -= len;
3416 } else {
3417 memcpy(payload + payload_len, buf, len);
3418 payload_len += len;
3419 target_name_printed = 1;
3420 if (len > skip_bytes)
3421 skip_bytes = 0;
3422 }
3423 }
3424
3425 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3426 sockaddr = &conn->local_sockaddr;
3427 else
3428 sockaddr = &np->np_sockaddr;
3429
3430 len = sprintf(buf, "TargetAddress="
3431 "%pISpc,%hu",
3432 sockaddr,
3433 tpg->tpgt);
3434 len += 1;
3435
3436 if ((len + payload_len) > buffer_len) {
3437 spin_unlock(&tpg->tpg_np_lock);
3438 spin_unlock(&tiqn->tiqn_tpg_lock);
3439 end_of_buf = 1;
3440 goto eob;
3441 }
3442
3443 if (skip_bytes && len <= skip_bytes) {
3444 skip_bytes -= len;
3445 } else {
3446 memcpy(payload + payload_len, buf, len);
3447 payload_len += len;
3448 if (len > skip_bytes)
3449 skip_bytes = 0;
3450 }
3451 }
3452 spin_unlock(&tpg->tpg_np_lock);
3453 }
3454 spin_unlock(&tiqn->tiqn_tpg_lock);
3455 eob:
3456 if (end_of_buf) {
3457 *completed = false;
3458 break;
3459 }
3460
3461 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3462 break;
3463 }
3464 spin_unlock(&tiqn_lock);
3465
3466 cmd->buf_ptr = payload;
3467
3468 return payload_len;
3469 }
3470
3471 int
3472 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3473 struct iscsi_text_rsp *hdr,
3474 enum iscsit_transport_type network_transport)
3475 {
3476 int text_length, padding;
3477 bool completed = true;
3478
3479 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3480 cmd->read_data_done,
3481 &completed);
3482 if (text_length < 0)
3483 return text_length;
3484
3485 if (completed) {
3486 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3487 } else {
3488 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3489 cmd->read_data_done += text_length;
3490 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3491 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3492 }
3493 hdr->opcode = ISCSI_OP_TEXT_RSP;
3494 padding = ((-text_length) & 3);
3495 hton24(hdr->dlength, text_length);
3496 hdr->itt = cmd->init_task_tag;
3497 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3498 cmd->stat_sn = conn->stat_sn++;
3499 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3500
3501 iscsit_increment_maxcmdsn(cmd, conn->sess);
3502 /*
3503 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3504 * correctly increment MaxCmdSN for each response answering a
3505 * non immediate text request with a valid CmdSN.
3506 */
3507 cmd->maxcmdsn_inc = 0;
3508 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3509 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3510
3511 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3512 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3513 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3514 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3515 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3516
3517 return text_length + padding;
3518 }
3519 EXPORT_SYMBOL(iscsit_build_text_rsp);
3520
3521 static int iscsit_send_text_rsp(
3522 struct iscsi_cmd *cmd,
3523 struct iscsi_conn *conn)
3524 {
3525 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3526 int text_length;
3527
3528 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3529 conn->conn_transport->transport_type);
3530 if (text_length < 0)
3531 return text_length;
3532
3533 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3534 cmd->buf_ptr,
3535 text_length);
3536 }
3537
3538 void
3539 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3540 struct iscsi_reject *hdr)
3541 {
3542 hdr->opcode = ISCSI_OP_REJECT;
3543 hdr->reason = cmd->reject_reason;
3544 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3545 hton24(hdr->dlength, ISCSI_HDR_LEN);
3546 hdr->ffffffff = cpu_to_be32(0xffffffff);
3547 cmd->stat_sn = conn->stat_sn++;
3548 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3549 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3550 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3551
3552 }
3553 EXPORT_SYMBOL(iscsit_build_reject);
3554
3555 static int iscsit_send_reject(
3556 struct iscsi_cmd *cmd,
3557 struct iscsi_conn *conn)
3558 {
3559 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3560
3561 iscsit_build_reject(cmd, conn, hdr);
3562
3563 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3564 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3565
3566 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3567 cmd->buf_ptr,
3568 ISCSI_HDR_LEN);
3569 }
3570
3571 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3572 {
3573 int ord, cpu;
3574 /*
3575 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3576 * within iscsit_start_kthreads()
3577 *
3578 * Here we use bitmap_id to determine which CPU that this
3579 * iSCSI connection's RX/TX threads will be scheduled to
3580 * execute upon.
3581 */
3582 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3583 for_each_online_cpu(cpu) {
3584 if (ord-- == 0) {
3585 cpumask_set_cpu(cpu, conn->conn_cpumask);
3586 return;
3587 }
3588 }
3589 /*
3590 * This should never be reached..
3591 */
3592 dump_stack();
3593 cpumask_setall(conn->conn_cpumask);
3594 }
3595
3596 int
3597 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3598 {
3599 int ret;
3600
3601 switch (state) {
3602 case ISTATE_SEND_R2T:
3603 ret = iscsit_send_r2t(cmd, conn);
3604 if (ret < 0)
3605 goto err;
3606 break;
3607 case ISTATE_REMOVE:
3608 spin_lock_bh(&conn->cmd_lock);
3609 list_del_init(&cmd->i_conn_node);
3610 spin_unlock_bh(&conn->cmd_lock);
3611
3612 iscsit_free_cmd(cmd, false);
3613 break;
3614 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3615 iscsit_mod_nopin_response_timer(conn);
3616 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3617 if (ret < 0)
3618 goto err;
3619 break;
3620 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3621 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3622 if (ret < 0)
3623 goto err;
3624 break;
3625 default:
3626 pr_err("Unknown Opcode: 0x%02x ITT:"
3627 " 0x%08x, i_state: %d on CID: %hu\n",
3628 cmd->iscsi_opcode, cmd->init_task_tag, state,
3629 conn->cid);
3630 goto err;
3631 }
3632
3633 return 0;
3634
3635 err:
3636 return -1;
3637 }
3638 EXPORT_SYMBOL(iscsit_immediate_queue);
3639
3640 static int
3641 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3642 {
3643 struct iscsit_transport *t = conn->conn_transport;
3644 struct iscsi_queue_req *qr;
3645 struct iscsi_cmd *cmd;
3646 u8 state;
3647 int ret;
3648
3649 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3650 atomic_set(&conn->check_immediate_queue, 0);
3651 cmd = qr->cmd;
3652 state = qr->state;
3653 kmem_cache_free(lio_qr_cache, qr);
3654
3655 ret = t->iscsit_immediate_queue(conn, cmd, state);
3656 if (ret < 0)
3657 return ret;
3658 }
3659
3660 return 0;
3661 }
3662
3663 int
3664 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3665 {
3666 int ret;
3667
3668 check_rsp_state:
3669 switch (state) {
3670 case ISTATE_SEND_DATAIN:
3671 ret = iscsit_send_datain(cmd, conn);
3672 if (ret < 0)
3673 goto err;
3674 else if (!ret)
3675 /* more drs */
3676 goto check_rsp_state;
3677 else if (ret == 1) {
3678 /* all done */
3679 spin_lock_bh(&cmd->istate_lock);
3680 cmd->i_state = ISTATE_SENT_STATUS;
3681 spin_unlock_bh(&cmd->istate_lock);
3682
3683 if (atomic_read(&conn->check_immediate_queue))
3684 return 1;
3685
3686 return 0;
3687 } else if (ret == 2) {
3688 /* Still must send status,
3689 SCF_TRANSPORT_TASK_SENSE was set */
3690 spin_lock_bh(&cmd->istate_lock);
3691 cmd->i_state = ISTATE_SEND_STATUS;
3692 spin_unlock_bh(&cmd->istate_lock);
3693 state = ISTATE_SEND_STATUS;
3694 goto check_rsp_state;
3695 }
3696
3697 break;
3698 case ISTATE_SEND_STATUS:
3699 case ISTATE_SEND_STATUS_RECOVERY:
3700 ret = iscsit_send_response(cmd, conn);
3701 break;
3702 case ISTATE_SEND_LOGOUTRSP:
3703 ret = iscsit_send_logout(cmd, conn);
3704 break;
3705 case ISTATE_SEND_ASYNCMSG:
3706 ret = iscsit_send_conn_drop_async_message(
3707 cmd, conn);
3708 break;
3709 case ISTATE_SEND_NOPIN:
3710 ret = iscsit_send_nopin(cmd, conn);
3711 break;
3712 case ISTATE_SEND_REJECT:
3713 ret = iscsit_send_reject(cmd, conn);
3714 break;
3715 case ISTATE_SEND_TASKMGTRSP:
3716 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3717 if (ret != 0)
3718 break;
3719 ret = iscsit_tmr_post_handler(cmd, conn);
3720 if (ret != 0)
3721 iscsit_fall_back_to_erl0(conn->sess);
3722 break;
3723 case ISTATE_SEND_TEXTRSP:
3724 ret = iscsit_send_text_rsp(cmd, conn);
3725 break;
3726 default:
3727 pr_err("Unknown Opcode: 0x%02x ITT:"
3728 " 0x%08x, i_state: %d on CID: %hu\n",
3729 cmd->iscsi_opcode, cmd->init_task_tag,
3730 state, conn->cid);
3731 goto err;
3732 }
3733 if (ret < 0)
3734 goto err;
3735
3736 switch (state) {
3737 case ISTATE_SEND_LOGOUTRSP:
3738 if (!iscsit_logout_post_handler(cmd, conn))
3739 return -ECONNRESET;
3740 /* fall through */
3741 case ISTATE_SEND_STATUS:
3742 case ISTATE_SEND_ASYNCMSG:
3743 case ISTATE_SEND_NOPIN:
3744 case ISTATE_SEND_STATUS_RECOVERY:
3745 case ISTATE_SEND_TEXTRSP:
3746 case ISTATE_SEND_TASKMGTRSP:
3747 case ISTATE_SEND_REJECT:
3748 spin_lock_bh(&cmd->istate_lock);
3749 cmd->i_state = ISTATE_SENT_STATUS;
3750 spin_unlock_bh(&cmd->istate_lock);
3751 break;
3752 default:
3753 pr_err("Unknown Opcode: 0x%02x ITT:"
3754 " 0x%08x, i_state: %d on CID: %hu\n",
3755 cmd->iscsi_opcode, cmd->init_task_tag,
3756 cmd->i_state, conn->cid);
3757 goto err;
3758 }
3759
3760 if (atomic_read(&conn->check_immediate_queue))
3761 return 1;
3762
3763 return 0;
3764
3765 err:
3766 return -1;
3767 }
3768 EXPORT_SYMBOL(iscsit_response_queue);
3769
3770 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3771 {
3772 struct iscsit_transport *t = conn->conn_transport;
3773 struct iscsi_queue_req *qr;
3774 struct iscsi_cmd *cmd;
3775 u8 state;
3776 int ret;
3777
3778 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3779 cmd = qr->cmd;
3780 state = qr->state;
3781 kmem_cache_free(lio_qr_cache, qr);
3782
3783 ret = t->iscsit_response_queue(conn, cmd, state);
3784 if (ret == 1 || ret < 0)
3785 return ret;
3786 }
3787
3788 return 0;
3789 }
3790
3791 int iscsi_target_tx_thread(void *arg)
3792 {
3793 int ret = 0;
3794 struct iscsi_conn *conn = arg;
3795 bool conn_freed = false;
3796
3797 /*
3798 * Allow ourselves to be interrupted by SIGINT so that a
3799 * connection recovery / failure event can be triggered externally.
3800 */
3801 allow_signal(SIGINT);
3802
3803 while (!kthread_should_stop()) {
3804 /*
3805 * Ensure that both TX and RX per connection kthreads
3806 * are scheduled to run on the same CPU.
3807 */
3808 iscsit_thread_check_cpumask(conn, current, 1);
3809
3810 wait_event_interruptible(conn->queues_wq,
3811 !iscsit_conn_all_queues_empty(conn));
3812
3813 if (signal_pending(current))
3814 goto transport_err;
3815
3816 get_immediate:
3817 ret = iscsit_handle_immediate_queue(conn);
3818 if (ret < 0)
3819 goto transport_err;
3820
3821 ret = iscsit_handle_response_queue(conn);
3822 if (ret == 1) {
3823 goto get_immediate;
3824 } else if (ret == -ECONNRESET) {
3825 conn_freed = true;
3826 goto out;
3827 } else if (ret < 0) {
3828 goto transport_err;
3829 }
3830 }
3831
3832 transport_err:
3833 /*
3834 * Avoid the normal connection failure code-path if this connection
3835 * is still within LOGIN mode, and iscsi_np process context is
3836 * responsible for cleaning up the early connection failure.
3837 */
3838 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3839 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3840 out:
3841 if (!conn_freed) {
3842 while (!kthread_should_stop()) {
3843 msleep(100);
3844 }
3845 }
3846 return 0;
3847 }
3848
3849 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3850 {
3851 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3852 struct iscsi_cmd *cmd;
3853 int ret = 0;
3854
3855 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3856 case ISCSI_OP_SCSI_CMD:
3857 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3858 if (!cmd)
3859 goto reject;
3860
3861 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3862 break;
3863 case ISCSI_OP_SCSI_DATA_OUT:
3864 ret = iscsit_handle_data_out(conn, buf);
3865 break;
3866 case ISCSI_OP_NOOP_OUT:
3867 cmd = NULL;
3868 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3869 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3870 if (!cmd)
3871 goto reject;
3872 }
3873 ret = iscsit_handle_nop_out(conn, cmd, buf);
3874 break;
3875 case ISCSI_OP_SCSI_TMFUNC:
3876 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3877 if (!cmd)
3878 goto reject;
3879
3880 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3881 break;
3882 case ISCSI_OP_TEXT:
3883 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3884 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3885 if (!cmd)
3886 goto reject;
3887 } else {
3888 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3889 if (!cmd)
3890 goto reject;
3891 }
3892
3893 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3894 break;
3895 case ISCSI_OP_LOGOUT:
3896 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3897 if (!cmd)
3898 goto reject;
3899
3900 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3901 if (ret > 0)
3902 wait_for_completion_timeout(&conn->conn_logout_comp,
3903 SECONDS_FOR_LOGOUT_COMP * HZ);
3904 break;
3905 case ISCSI_OP_SNACK:
3906 ret = iscsit_handle_snack(conn, buf);
3907 break;
3908 default:
3909 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3910 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3911 pr_err("Cannot recover from unknown"
3912 " opcode while ERL=0, closing iSCSI connection.\n");
3913 return -1;
3914 }
3915 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3916 " closing iSCSI connection.\n");
3917 ret = -1;
3918 break;
3919 }
3920
3921 return ret;
3922 reject:
3923 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3924 }
3925
3926 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3927 {
3928 bool ret;
3929
3930 spin_lock_bh(&conn->state_lock);
3931 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3932 spin_unlock_bh(&conn->state_lock);
3933
3934 return ret;
3935 }
3936
3937 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3938 {
3939 int ret;
3940 u8 *buffer, opcode;
3941 u32 checksum = 0, digest = 0;
3942 struct kvec iov;
3943
3944 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3945 if (!buffer)
3946 return;
3947
3948 while (!kthread_should_stop()) {
3949 /*
3950 * Ensure that both TX and RX per connection kthreads
3951 * are scheduled to run on the same CPU.
3952 */
3953 iscsit_thread_check_cpumask(conn, current, 0);
3954
3955 memset(&iov, 0, sizeof(struct kvec));
3956
3957 iov.iov_base = buffer;
3958 iov.iov_len = ISCSI_HDR_LEN;
3959
3960 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3961 if (ret != ISCSI_HDR_LEN) {
3962 iscsit_rx_thread_wait_for_tcp(conn);
3963 break;
3964 }
3965
3966 if (conn->conn_ops->HeaderDigest) {
3967 iov.iov_base = &digest;
3968 iov.iov_len = ISCSI_CRC_LEN;
3969
3970 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3971 if (ret != ISCSI_CRC_LEN) {
3972 iscsit_rx_thread_wait_for_tcp(conn);
3973 break;
3974 }
3975
3976 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3977 ISCSI_HDR_LEN, 0, NULL,
3978 &checksum);
3979
3980 if (digest != checksum) {
3981 pr_err("HeaderDigest CRC32C failed,"
3982 " received 0x%08x, computed 0x%08x\n",
3983 digest, checksum);
3984 /*
3985 * Set the PDU to 0xff so it will intentionally
3986 * hit default in the switch below.
3987 */
3988 memset(buffer, 0xff, ISCSI_HDR_LEN);
3989 atomic_long_inc(&conn->sess->conn_digest_errors);
3990 } else {
3991 pr_debug("Got HeaderDigest CRC32C"
3992 " 0x%08x\n", checksum);
3993 }
3994 }
3995
3996 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3997 break;
3998
3999 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4000
4001 if (conn->sess->sess_ops->SessionType &&
4002 ((!(opcode & ISCSI_OP_TEXT)) ||
4003 (!(opcode & ISCSI_OP_LOGOUT)))) {
4004 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4005 " while in Discovery Session, rejecting.\n", opcode);
4006 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4007 buffer);
4008 break;
4009 }
4010
4011 ret = iscsi_target_rx_opcode(conn, buffer);
4012 if (ret < 0)
4013 break;
4014 }
4015
4016 kfree(buffer);
4017 }
4018
4019 int iscsi_target_rx_thread(void *arg)
4020 {
4021 int rc;
4022 struct iscsi_conn *conn = arg;
4023 bool conn_freed = false;
4024
4025 /*
4026 * Allow ourselves to be interrupted by SIGINT so that a
4027 * connection recovery / failure event can be triggered externally.
4028 */
4029 allow_signal(SIGINT);
4030 /*
4031 * Wait for iscsi_post_login_handler() to complete before allowing
4032 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4033 */
4034 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4035 if (rc < 0 || iscsi_target_check_conn_state(conn))
4036 goto out;
4037
4038 if (!conn->conn_transport->iscsit_get_rx_pdu)
4039 return 0;
4040
4041 conn->conn_transport->iscsit_get_rx_pdu(conn);
4042
4043 if (!signal_pending(current))
4044 atomic_set(&conn->transport_failed, 1);
4045 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4046
4047 out:
4048 if (!conn_freed) {
4049 while (!kthread_should_stop()) {
4050 msleep(100);
4051 }
4052 }
4053
4054 return 0;
4055 }
4056
4057 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4058 {
4059 LIST_HEAD(tmp_list);
4060 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4061 struct iscsi_session *sess = conn->sess;
4062 /*
4063 * We expect this function to only ever be called from either RX or TX
4064 * thread context via iscsit_close_connection() once the other context
4065 * has been reset -> returned sleeping pre-handler state.
4066 */
4067 spin_lock_bh(&conn->cmd_lock);
4068 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4069
4070 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4071 struct se_cmd *se_cmd = &cmd->se_cmd;
4072
4073 if (se_cmd->se_tfo != NULL) {
4074 spin_lock_irq(&se_cmd->t_state_lock);
4075 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4076 spin_unlock_irq(&se_cmd->t_state_lock);
4077 }
4078 }
4079 spin_unlock_bh(&conn->cmd_lock);
4080
4081 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4082 list_del_init(&cmd->i_conn_node);
4083
4084 iscsit_increment_maxcmdsn(cmd, sess);
4085 iscsit_free_cmd(cmd, true);
4086
4087 }
4088 }
4089
4090 static void iscsit_stop_timers_for_cmds(
4091 struct iscsi_conn *conn)
4092 {
4093 struct iscsi_cmd *cmd;
4094
4095 spin_lock_bh(&conn->cmd_lock);
4096 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4097 if (cmd->data_direction == DMA_TO_DEVICE)
4098 iscsit_stop_dataout_timer(cmd);
4099 }
4100 spin_unlock_bh(&conn->cmd_lock);
4101 }
4102
4103 int iscsit_close_connection(
4104 struct iscsi_conn *conn)
4105 {
4106 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4107 struct iscsi_session *sess = conn->sess;
4108
4109 pr_debug("Closing iSCSI connection CID %hu on SID:"
4110 " %u\n", conn->cid, sess->sid);
4111 /*
4112 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4113 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4114 * sleeping and the logout response never got sent because the
4115 * connection failed.
4116 *
4117 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4118 * to signal logout response TX interrupt completion. Go ahead and skip
4119 * this for iser since isert_rx_opcode() does not wait on logout failure,
4120 * and to avoid iscsi_conn pointer dereference in iser-target code.
4121 */
4122 if (!conn->conn_transport->rdma_shutdown)
4123 complete(&conn->conn_logout_comp);
4124
4125 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4126 if (conn->tx_thread &&
4127 cmpxchg(&conn->tx_thread_active, true, false)) {
4128 send_sig(SIGINT, conn->tx_thread, 1);
4129 kthread_stop(conn->tx_thread);
4130 }
4131 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4132 if (conn->rx_thread &&
4133 cmpxchg(&conn->rx_thread_active, true, false)) {
4134 send_sig(SIGINT, conn->rx_thread, 1);
4135 kthread_stop(conn->rx_thread);
4136 }
4137 }
4138
4139 spin_lock(&iscsit_global->ts_bitmap_lock);
4140 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4141 get_order(1));
4142 spin_unlock(&iscsit_global->ts_bitmap_lock);
4143
4144 iscsit_stop_timers_for_cmds(conn);
4145 iscsit_stop_nopin_response_timer(conn);
4146 iscsit_stop_nopin_timer(conn);
4147
4148 if (conn->conn_transport->iscsit_wait_conn)
4149 conn->conn_transport->iscsit_wait_conn(conn);
4150
4151 /*
4152 * During Connection recovery drop unacknowledged out of order
4153 * commands for this connection, and prepare the other commands
4154 * for reallegiance.
4155 *
4156 * During normal operation clear the out of order commands (but
4157 * do not free the struct iscsi_ooo_cmdsn's) and release all
4158 * struct iscsi_cmds.
4159 */
4160 if (atomic_read(&conn->connection_recovery)) {
4161 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4162 iscsit_prepare_cmds_for_reallegiance(conn);
4163 } else {
4164 iscsit_clear_ooo_cmdsns_for_conn(conn);
4165 iscsit_release_commands_from_conn(conn);
4166 }
4167 iscsit_free_queue_reqs_for_conn(conn);
4168
4169 /*
4170 * Handle decrementing session or connection usage count if
4171 * a logout response was not able to be sent because the
4172 * connection failed. Fall back to Session Recovery here.
4173 */
4174 if (atomic_read(&conn->conn_logout_remove)) {
4175 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4176 iscsit_dec_conn_usage_count(conn);
4177 iscsit_dec_session_usage_count(sess);
4178 }
4179 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4180 iscsit_dec_conn_usage_count(conn);
4181
4182 atomic_set(&conn->conn_logout_remove, 0);
4183 atomic_set(&sess->session_reinstatement, 0);
4184 atomic_set(&sess->session_fall_back_to_erl0, 1);
4185 }
4186
4187 spin_lock_bh(&sess->conn_lock);
4188 list_del(&conn->conn_list);
4189
4190 /*
4191 * Attempt to let the Initiator know this connection failed by
4192 * sending an Connection Dropped Async Message on another
4193 * active connection.
4194 */
4195 if (atomic_read(&conn->connection_recovery))
4196 iscsit_build_conn_drop_async_message(conn);
4197
4198 spin_unlock_bh(&sess->conn_lock);
4199
4200 /*
4201 * If connection reinstatement is being performed on this connection,
4202 * up the connection reinstatement semaphore that is being blocked on
4203 * in iscsit_cause_connection_reinstatement().
4204 */
4205 spin_lock_bh(&conn->state_lock);
4206 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4207 spin_unlock_bh(&conn->state_lock);
4208 complete(&conn->conn_wait_comp);
4209 wait_for_completion(&conn->conn_post_wait_comp);
4210 spin_lock_bh(&conn->state_lock);
4211 }
4212
4213 /*
4214 * If connection reinstatement is being performed on this connection
4215 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4216 * connection wait rcfr semaphore that is being blocked on
4217 * an iscsit_connection_reinstatement_rcfr().
4218 */
4219 if (atomic_read(&conn->connection_wait_rcfr)) {
4220 spin_unlock_bh(&conn->state_lock);
4221 complete(&conn->conn_wait_rcfr_comp);
4222 wait_for_completion(&conn->conn_post_wait_comp);
4223 spin_lock_bh(&conn->state_lock);
4224 }
4225 atomic_set(&conn->connection_reinstatement, 1);
4226 spin_unlock_bh(&conn->state_lock);
4227
4228 /*
4229 * If any other processes are accessing this connection pointer we
4230 * must wait until they have completed.
4231 */
4232 iscsit_check_conn_usage_count(conn);
4233
4234 ahash_request_free(conn->conn_tx_hash);
4235 if (conn->conn_rx_hash) {
4236 struct crypto_ahash *tfm;
4237
4238 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4239 ahash_request_free(conn->conn_rx_hash);
4240 crypto_free_ahash(tfm);
4241 }
4242
4243 if (conn->sock)
4244 sock_release(conn->sock);
4245
4246 if (conn->conn_transport->iscsit_free_conn)
4247 conn->conn_transport->iscsit_free_conn(conn);
4248
4249 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4250 conn->conn_state = TARG_CONN_STATE_FREE;
4251 iscsit_free_conn(conn);
4252
4253 spin_lock_bh(&sess->conn_lock);
4254 atomic_dec(&sess->nconn);
4255 pr_debug("Decremented iSCSI connection count to %hu from node:"
4256 " %s\n", atomic_read(&sess->nconn),
4257 sess->sess_ops->InitiatorName);
4258 /*
4259 * Make sure that if one connection fails in an non ERL=2 iSCSI
4260 * Session that they all fail.
4261 */
4262 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4263 !atomic_read(&sess->session_logout))
4264 atomic_set(&sess->session_fall_back_to_erl0, 1);
4265
4266 /*
4267 * If this was not the last connection in the session, and we are
4268 * performing session reinstatement or falling back to ERL=0, call
4269 * iscsit_stop_session() without sleeping to shutdown the other
4270 * active connections.
4271 */
4272 if (atomic_read(&sess->nconn)) {
4273 if (!atomic_read(&sess->session_reinstatement) &&
4274 !atomic_read(&sess->session_fall_back_to_erl0)) {
4275 spin_unlock_bh(&sess->conn_lock);
4276 return 0;
4277 }
4278 if (!atomic_read(&sess->session_stop_active)) {
4279 atomic_set(&sess->session_stop_active, 1);
4280 spin_unlock_bh(&sess->conn_lock);
4281 iscsit_stop_session(sess, 0, 0);
4282 return 0;
4283 }
4284 spin_unlock_bh(&sess->conn_lock);
4285 return 0;
4286 }
4287
4288 /*
4289 * If this was the last connection in the session and one of the
4290 * following is occurring:
4291 *
4292 * Session Reinstatement is not being performed, and are falling back
4293 * to ERL=0 call iscsit_close_session().
4294 *
4295 * Session Logout was requested. iscsit_close_session() will be called
4296 * elsewhere.
4297 *
4298 * Session Continuation is not being performed, start the Time2Retain
4299 * handler and check if sleep_on_sess_wait_sem is active.
4300 */
4301 if (!atomic_read(&sess->session_reinstatement) &&
4302 atomic_read(&sess->session_fall_back_to_erl0)) {
4303 spin_unlock_bh(&sess->conn_lock);
4304 complete_all(&sess->session_wait_comp);
4305 iscsit_close_session(sess);
4306
4307 return 0;
4308 } else if (atomic_read(&sess->session_logout)) {
4309 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4310 sess->session_state = TARG_SESS_STATE_FREE;
4311
4312 if (atomic_read(&sess->session_close)) {
4313 spin_unlock_bh(&sess->conn_lock);
4314 complete_all(&sess->session_wait_comp);
4315 iscsit_close_session(sess);
4316 } else {
4317 spin_unlock_bh(&sess->conn_lock);
4318 }
4319
4320 return 0;
4321 } else {
4322 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4323 sess->session_state = TARG_SESS_STATE_FAILED;
4324
4325 if (!atomic_read(&sess->session_continuation))
4326 iscsit_start_time2retain_handler(sess);
4327
4328 if (atomic_read(&sess->session_close)) {
4329 spin_unlock_bh(&sess->conn_lock);
4330 complete_all(&sess->session_wait_comp);
4331 iscsit_close_session(sess);
4332 } else {
4333 spin_unlock_bh(&sess->conn_lock);
4334 }
4335
4336 return 0;
4337 }
4338 }
4339
4340 /*
4341 * If the iSCSI Session for the iSCSI Initiator Node exists,
4342 * forcefully shutdown the iSCSI NEXUS.
4343 */
4344 int iscsit_close_session(struct iscsi_session *sess)
4345 {
4346 struct iscsi_portal_group *tpg = sess->tpg;
4347 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4348
4349 if (atomic_read(&sess->nconn)) {
4350 pr_err("%d connection(s) still exist for iSCSI session"
4351 " to %s\n", atomic_read(&sess->nconn),
4352 sess->sess_ops->InitiatorName);
4353 BUG();
4354 }
4355
4356 spin_lock_bh(&se_tpg->session_lock);
4357 atomic_set(&sess->session_logout, 1);
4358 atomic_set(&sess->session_reinstatement, 1);
4359 iscsit_stop_time2retain_timer(sess);
4360 spin_unlock_bh(&se_tpg->session_lock);
4361
4362 /*
4363 * transport_deregister_session_configfs() will clear the
4364 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4365 * can be setting it again with __transport_register_session() in
4366 * iscsi_post_login_handler() again after the iscsit_stop_session()
4367 * completes in iscsi_np context.
4368 */
4369 transport_deregister_session_configfs(sess->se_sess);
4370
4371 /*
4372 * If any other processes are accessing this session pointer we must
4373 * wait until they have completed. If we are in an interrupt (the
4374 * time2retain handler) and contain and active session usage count we
4375 * restart the timer and exit.
4376 */
4377 if (!in_interrupt()) {
4378 iscsit_check_session_usage_count(sess);
4379 } else {
4380 if (iscsit_check_session_usage_count(sess) == 2) {
4381 atomic_set(&sess->session_logout, 0);
4382 iscsit_start_time2retain_handler(sess);
4383 return 0;
4384 }
4385 }
4386
4387 transport_deregister_session(sess->se_sess);
4388
4389 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4390 iscsit_free_connection_recovery_entries(sess);
4391
4392 iscsit_free_all_ooo_cmdsns(sess);
4393
4394 spin_lock_bh(&se_tpg->session_lock);
4395 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4396 sess->session_state = TARG_SESS_STATE_FREE;
4397 pr_debug("Released iSCSI session from node: %s\n",
4398 sess->sess_ops->InitiatorName);
4399 tpg->nsessions--;
4400 if (tpg->tpg_tiqn)
4401 tpg->tpg_tiqn->tiqn_nsessions--;
4402
4403 pr_debug("Decremented number of active iSCSI Sessions on"
4404 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4405
4406 ida_free(&sess_ida, sess->session_index);
4407 kfree(sess->sess_ops);
4408 sess->sess_ops = NULL;
4409 spin_unlock_bh(&se_tpg->session_lock);
4410
4411 kfree(sess);
4412 return 0;
4413 }
4414
4415 static void iscsit_logout_post_handler_closesession(
4416 struct iscsi_conn *conn)
4417 {
4418 struct iscsi_session *sess = conn->sess;
4419 int sleep = 1;
4420 /*
4421 * Traditional iscsi/tcp will invoke this logic from TX thread
4422 * context during session logout, so clear tx_thread_active and
4423 * sleep if iscsit_close_connection() has not already occured.
4424 *
4425 * Since iser-target invokes this logic from it's own workqueue,
4426 * always sleep waiting for RX/TX thread shutdown to complete
4427 * within iscsit_close_connection().
4428 */
4429 if (!conn->conn_transport->rdma_shutdown) {
4430 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4431 if (!sleep)
4432 return;
4433 }
4434
4435 atomic_set(&conn->conn_logout_remove, 0);
4436 complete(&conn->conn_logout_comp);
4437
4438 iscsit_dec_conn_usage_count(conn);
4439 atomic_set(&sess->session_close, 1);
4440 iscsit_stop_session(sess, sleep, sleep);
4441 iscsit_dec_session_usage_count(sess);
4442 }
4443
4444 static void iscsit_logout_post_handler_samecid(
4445 struct iscsi_conn *conn)
4446 {
4447 int sleep = 1;
4448
4449 if (!conn->conn_transport->rdma_shutdown) {
4450 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4451 if (!sleep)
4452 return;
4453 }
4454
4455 atomic_set(&conn->conn_logout_remove, 0);
4456 complete(&conn->conn_logout_comp);
4457
4458 iscsit_cause_connection_reinstatement(conn, sleep);
4459 iscsit_dec_conn_usage_count(conn);
4460 }
4461
4462 static void iscsit_logout_post_handler_diffcid(
4463 struct iscsi_conn *conn,
4464 u16 cid)
4465 {
4466 struct iscsi_conn *l_conn;
4467 struct iscsi_session *sess = conn->sess;
4468 bool conn_found = false;
4469
4470 if (!sess)
4471 return;
4472
4473 spin_lock_bh(&sess->conn_lock);
4474 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4475 if (l_conn->cid == cid) {
4476 iscsit_inc_conn_usage_count(l_conn);
4477 conn_found = true;
4478 break;
4479 }
4480 }
4481 spin_unlock_bh(&sess->conn_lock);
4482
4483 if (!conn_found)
4484 return;
4485
4486 if (l_conn->sock)
4487 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4488
4489 spin_lock_bh(&l_conn->state_lock);
4490 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4491 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4492 spin_unlock_bh(&l_conn->state_lock);
4493
4494 iscsit_cause_connection_reinstatement(l_conn, 1);
4495 iscsit_dec_conn_usage_count(l_conn);
4496 }
4497
4498 /*
4499 * Return of 0 causes the TX thread to restart.
4500 */
4501 int iscsit_logout_post_handler(
4502 struct iscsi_cmd *cmd,
4503 struct iscsi_conn *conn)
4504 {
4505 int ret = 0;
4506
4507 switch (cmd->logout_reason) {
4508 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4509 switch (cmd->logout_response) {
4510 case ISCSI_LOGOUT_SUCCESS:
4511 case ISCSI_LOGOUT_CLEANUP_FAILED:
4512 default:
4513 iscsit_logout_post_handler_closesession(conn);
4514 break;
4515 }
4516 ret = 0;
4517 break;
4518 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4519 if (conn->cid == cmd->logout_cid) {
4520 switch (cmd->logout_response) {
4521 case ISCSI_LOGOUT_SUCCESS:
4522 case ISCSI_LOGOUT_CLEANUP_FAILED:
4523 default:
4524 iscsit_logout_post_handler_samecid(conn);
4525 break;
4526 }
4527 ret = 0;
4528 } else {
4529 switch (cmd->logout_response) {
4530 case ISCSI_LOGOUT_SUCCESS:
4531 iscsit_logout_post_handler_diffcid(conn,
4532 cmd->logout_cid);
4533 break;
4534 case ISCSI_LOGOUT_CID_NOT_FOUND:
4535 case ISCSI_LOGOUT_CLEANUP_FAILED:
4536 default:
4537 break;
4538 }
4539 ret = 1;
4540 }
4541 break;
4542 case ISCSI_LOGOUT_REASON_RECOVERY:
4543 switch (cmd->logout_response) {
4544 case ISCSI_LOGOUT_SUCCESS:
4545 case ISCSI_LOGOUT_CID_NOT_FOUND:
4546 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4547 case ISCSI_LOGOUT_CLEANUP_FAILED:
4548 default:
4549 break;
4550 }
4551 ret = 1;
4552 break;
4553 default:
4554 break;
4555
4556 }
4557 return ret;
4558 }
4559 EXPORT_SYMBOL(iscsit_logout_post_handler);
4560
4561 void iscsit_fail_session(struct iscsi_session *sess)
4562 {
4563 struct iscsi_conn *conn;
4564
4565 spin_lock_bh(&sess->conn_lock);
4566 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4567 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4568 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4569 }
4570 spin_unlock_bh(&sess->conn_lock);
4571
4572 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4573 sess->session_state = TARG_SESS_STATE_FAILED;
4574 }
4575
4576 void iscsit_stop_session(
4577 struct iscsi_session *sess,
4578 int session_sleep,
4579 int connection_sleep)
4580 {
4581 u16 conn_count = atomic_read(&sess->nconn);
4582 struct iscsi_conn *conn, *conn_tmp = NULL;
4583 int is_last;
4584
4585 spin_lock_bh(&sess->conn_lock);
4586
4587 if (connection_sleep) {
4588 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4589 conn_list) {
4590 if (conn_count == 0)
4591 break;
4592
4593 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4594 is_last = 1;
4595 } else {
4596 iscsit_inc_conn_usage_count(conn_tmp);
4597 is_last = 0;
4598 }
4599 iscsit_inc_conn_usage_count(conn);
4600
4601 spin_unlock_bh(&sess->conn_lock);
4602 iscsit_cause_connection_reinstatement(conn, 1);
4603 spin_lock_bh(&sess->conn_lock);
4604
4605 iscsit_dec_conn_usage_count(conn);
4606 if (is_last == 0)
4607 iscsit_dec_conn_usage_count(conn_tmp);
4608 conn_count--;
4609 }
4610 } else {
4611 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4612 iscsit_cause_connection_reinstatement(conn, 0);
4613 }
4614
4615 if (session_sleep && atomic_read(&sess->nconn)) {
4616 spin_unlock_bh(&sess->conn_lock);
4617 wait_for_completion(&sess->session_wait_comp);
4618 } else
4619 spin_unlock_bh(&sess->conn_lock);
4620 }
4621
4622 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4623 {
4624 struct iscsi_session *sess;
4625 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4626 struct se_session *se_sess, *se_sess_tmp;
4627 LIST_HEAD(free_list);
4628 int session_count = 0;
4629
4630 spin_lock_bh(&se_tpg->session_lock);
4631 if (tpg->nsessions && !force) {
4632 spin_unlock_bh(&se_tpg->session_lock);
4633 return -1;
4634 }
4635
4636 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4637 sess_list) {
4638 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4639
4640 spin_lock(&sess->conn_lock);
4641 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4642 atomic_read(&sess->session_logout) ||
4643 atomic_read(&sess->session_close) ||
4644 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4645 spin_unlock(&sess->conn_lock);
4646 continue;
4647 }
4648 iscsit_inc_session_usage_count(sess);
4649 atomic_set(&sess->session_reinstatement, 1);
4650 atomic_set(&sess->session_fall_back_to_erl0, 1);
4651 atomic_set(&sess->session_close, 1);
4652 spin_unlock(&sess->conn_lock);
4653
4654 list_move_tail(&se_sess->sess_list, &free_list);
4655 }
4656 spin_unlock_bh(&se_tpg->session_lock);
4657
4658 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4659 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4660
4661 list_del_init(&se_sess->sess_list);
4662 iscsit_stop_session(sess, 1, 1);
4663 iscsit_dec_session_usage_count(sess);
4664 session_count++;
4665 }
4666
4667 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4668 " Group: %hu\n", session_count, tpg->tpgt);
4669 return 0;
4670 }
4671
4672 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4673 MODULE_VERSION("4.1.x");
4674 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4675 MODULE_LICENSE("GPL");
4676
4677 module_init(iscsi_target_init_module);
4678 module_exit(iscsi_target_cleanup_module);
Linux with added FPC-III support