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Merge tag 'for-linus-20190706' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / target / iscsi / iscsi_target.c
blobd19e051f2bc23562c78124f661c9fac5a8da1901
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, 11) != 0) {
2193 pr_err("Received Text Data that is not"
2194 " SendTargets, cannot continue.\n");
2195 goto reject;
2196 }
2197 text_ptr = strchr(text_in, '=');
2198 if (!text_ptr) {
2199 pr_err("No \"=\" separator found in Text Data,"
2200 " cannot continue.\n");
2201 goto reject;
2202 }
2203 if (!strncmp("=All", text_ptr, 4)) {
2204 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2205 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2206 !strncmp("=eui.", text_ptr, 5)) {
2207 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2208 } else {
2209 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2210 goto reject;
2211 }
2212
2213 spin_lock_bh(&conn->cmd_lock);
2214 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2215 spin_unlock_bh(&conn->cmd_lock);
2216
2217 empty_sendtargets:
2218 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2219
2220 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2221 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2222 (unsigned char *)hdr, hdr->cmdsn);
2223 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2224 return -1;
2225
2226 return 0;
2227 }
2228
2229 return iscsit_execute_cmd(cmd, 0);
2230
2231 reject:
2232 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2233 (unsigned char *)hdr);
2234 }
2235 EXPORT_SYMBOL(iscsit_process_text_cmd);
2236
2237 static int
2238 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2239 unsigned char *buf)
2240 {
2241 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2242 char *text_in = NULL;
2243 u32 payload_length = ntoh24(hdr->dlength);
2244 int rx_size, rc;
2245
2246 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2247 if (rc < 0)
2248 return 0;
2249
2250 rx_size = payload_length;
2251 if (payload_length) {
2252 u32 checksum = 0, data_crc = 0;
2253 u32 padding = 0;
2254 int niov = 0, rx_got;
2255 struct kvec iov[2];
2256
2257 rx_size = ALIGN(payload_length, 4);
2258 text_in = kzalloc(rx_size, GFP_KERNEL);
2259 if (!text_in)
2260 goto reject;
2261
2262 cmd->text_in_ptr = text_in;
2263
2264 memset(iov, 0, sizeof(iov));
2265 iov[niov].iov_base = text_in;
2266 iov[niov++].iov_len = rx_size;
2267
2268 padding = rx_size - payload_length;
2269 if (padding)
2270 pr_debug("Receiving %u additional bytes"
2271 " for padding.\n", padding);
2272 if (conn->conn_ops->DataDigest) {
2273 iov[niov].iov_base = &checksum;
2274 iov[niov++].iov_len = ISCSI_CRC_LEN;
2275 rx_size += ISCSI_CRC_LEN;
2276 }
2277
2278 WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
2279 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2280 if (rx_got != rx_size)
2281 goto reject;
2282
2283 if (conn->conn_ops->DataDigest) {
2284 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2285 text_in, rx_size, 0, NULL,
2286 &data_crc);
2287
2288 if (checksum != data_crc) {
2289 pr_err("Text data CRC32C DataDigest"
2290 " 0x%08x does not match computed"
2291 " 0x%08x\n", checksum, data_crc);
2292 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2293 pr_err("Unable to recover from"
2294 " Text Data digest failure while in"
2295 " ERL=0.\n");
2296 goto reject;
2297 } else {
2298 /*
2299 * Silently drop this PDU and let the
2300 * initiator plug the CmdSN gap.
2301 */
2302 pr_debug("Dropping Text"
2303 " Command CmdSN: 0x%08x due to"
2304 " DataCRC error.\n", hdr->cmdsn);
2305 kfree(text_in);
2306 return 0;
2307 }
2308 } else {
2309 pr_debug("Got CRC32C DataDigest"
2310 " 0x%08x for %u bytes of text data.\n",
2311 checksum, payload_length);
2312 }
2313 }
2314 text_in[payload_length - 1] = '\0';
2315 pr_debug("Successfully read %d bytes of text"
2316 " data.\n", payload_length);
2317 }
2318
2319 return iscsit_process_text_cmd(conn, cmd, hdr);
2320
2321 reject:
2322 kfree(cmd->text_in_ptr);
2323 cmd->text_in_ptr = NULL;
2324 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2325 }
2326
2327 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2328 {
2329 struct iscsi_conn *conn_p;
2330 struct iscsi_session *sess = conn->sess;
2331
2332 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2333 " for SID: %u.\n", conn->cid, conn->sess->sid);
2334
2335 atomic_set(&sess->session_logout, 1);
2336 atomic_set(&conn->conn_logout_remove, 1);
2337 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2338
2339 iscsit_inc_conn_usage_count(conn);
2340 iscsit_inc_session_usage_count(sess);
2341
2342 spin_lock_bh(&sess->conn_lock);
2343 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2344 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2345 continue;
2346
2347 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2348 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2349 }
2350 spin_unlock_bh(&sess->conn_lock);
2351
2352 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2353
2354 return 0;
2355 }
2356
2357 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2358 {
2359 struct iscsi_conn *l_conn;
2360 struct iscsi_session *sess = conn->sess;
2361
2362 pr_debug("Received logout request CLOSECONNECTION for CID:"
2363 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2364
2365 /*
2366 * A Logout Request with a CLOSECONNECTION reason code for a CID
2367 * can arrive on a connection with a differing CID.
2368 */
2369 if (conn->cid == cmd->logout_cid) {
2370 spin_lock_bh(&conn->state_lock);
2371 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2372 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2373
2374 atomic_set(&conn->conn_logout_remove, 1);
2375 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2376 iscsit_inc_conn_usage_count(conn);
2377
2378 spin_unlock_bh(&conn->state_lock);
2379 } else {
2380 /*
2381 * Handle all different cid CLOSECONNECTION requests in
2382 * iscsit_logout_post_handler_diffcid() as to give enough
2383 * time for any non immediate command's CmdSN to be
2384 * acknowledged on the connection in question.
2385 *
2386 * Here we simply make sure the CID is still around.
2387 */
2388 l_conn = iscsit_get_conn_from_cid(sess,
2389 cmd->logout_cid);
2390 if (!l_conn) {
2391 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2392 iscsit_add_cmd_to_response_queue(cmd, conn,
2393 cmd->i_state);
2394 return 0;
2395 }
2396
2397 iscsit_dec_conn_usage_count(l_conn);
2398 }
2399
2400 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2401
2402 return 0;
2403 }
2404
2405 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2406 {
2407 struct iscsi_session *sess = conn->sess;
2408
2409 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2410 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2411
2412 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2413 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2414 " while ERL!=2.\n");
2415 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2416 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2417 return 0;
2418 }
2419
2420 if (conn->cid == cmd->logout_cid) {
2421 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2422 " with CID: %hu on CID: %hu, implementation error.\n",
2423 cmd->logout_cid, conn->cid);
2424 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2425 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2426 return 0;
2427 }
2428
2429 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2430
2431 return 0;
2432 }
2433
2434 int
2435 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2436 unsigned char *buf)
2437 {
2438 int cmdsn_ret, logout_remove = 0;
2439 u8 reason_code = 0;
2440 struct iscsi_logout *hdr;
2441 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2442
2443 hdr = (struct iscsi_logout *) buf;
2444 reason_code = (hdr->flags & 0x7f);
2445
2446 if (tiqn) {
2447 spin_lock(&tiqn->logout_stats.lock);
2448 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2449 tiqn->logout_stats.normal_logouts++;
2450 else
2451 tiqn->logout_stats.abnormal_logouts++;
2452 spin_unlock(&tiqn->logout_stats.lock);
2453 }
2454
2455 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2456 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2457 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2458 hdr->cid, conn->cid);
2459
2460 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2461 pr_err("Received logout request on connection that"
2462 " is not in logged in state, ignoring request.\n");
2463 iscsit_free_cmd(cmd, false);
2464 return 0;
2465 }
2466
2467 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2468 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2469 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2470 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2471 cmd->targ_xfer_tag = 0xFFFFFFFF;
2472 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2473 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2474 cmd->logout_cid = be16_to_cpu(hdr->cid);
2475 cmd->logout_reason = reason_code;
2476 cmd->data_direction = DMA_NONE;
2477
2478 /*
2479 * We need to sleep in these cases (by returning 1) until the Logout
2480 * Response gets sent in the tx thread.
2481 */
2482 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2483 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2484 be16_to_cpu(hdr->cid) == conn->cid))
2485 logout_remove = 1;
2486
2487 spin_lock_bh(&conn->cmd_lock);
2488 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2489 spin_unlock_bh(&conn->cmd_lock);
2490
2491 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2492 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2493
2494 /*
2495 * Immediate commands are executed, well, immediately.
2496 * Non-Immediate Logout Commands are executed in CmdSN order.
2497 */
2498 if (cmd->immediate_cmd) {
2499 int ret = iscsit_execute_cmd(cmd, 0);
2500
2501 if (ret < 0)
2502 return ret;
2503 } else {
2504 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2505 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2506 logout_remove = 0;
2507 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2508 return -1;
2509 }
2510
2511 return logout_remove;
2512 }
2513 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2514
2515 int iscsit_handle_snack(
2516 struct iscsi_conn *conn,
2517 unsigned char *buf)
2518 {
2519 struct iscsi_snack *hdr;
2520
2521 hdr = (struct iscsi_snack *) buf;
2522 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2523
2524 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2525 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2526 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2527 hdr->begrun, hdr->runlength, conn->cid);
2528
2529 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2530 pr_err("Initiator sent SNACK request while in"
2531 " ErrorRecoveryLevel=0.\n");
2532 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2533 buf);
2534 }
2535 /*
2536 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2537 * call from inside iscsi_send_recovery_datain_or_r2t().
2538 */
2539 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2540 case 0:
2541 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2542 hdr->itt,
2543 be32_to_cpu(hdr->ttt),
2544 be32_to_cpu(hdr->begrun),
2545 be32_to_cpu(hdr->runlength));
2546 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2547 return iscsit_handle_status_snack(conn, hdr->itt,
2548 be32_to_cpu(hdr->ttt),
2549 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2550 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2551 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2552 be32_to_cpu(hdr->begrun),
2553 be32_to_cpu(hdr->runlength));
2554 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2555 /* FIXME: Support R-Data SNACK */
2556 pr_err("R-Data SNACK Not Supported.\n");
2557 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2558 buf);
2559 default:
2560 pr_err("Unknown SNACK type 0x%02x, protocol"
2561 " error.\n", hdr->flags & 0x0f);
2562 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2563 buf);
2564 }
2565
2566 return 0;
2567 }
2568 EXPORT_SYMBOL(iscsit_handle_snack);
2569
2570 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2571 {
2572 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2573 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2574 wait_for_completion_interruptible_timeout(
2575 &conn->rx_half_close_comp,
2576 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2577 }
2578 }
2579
2580 static int iscsit_handle_immediate_data(
2581 struct iscsi_cmd *cmd,
2582 struct iscsi_scsi_req *hdr,
2583 u32 length)
2584 {
2585 int iov_ret, rx_got = 0, rx_size = 0;
2586 u32 checksum, iov_count = 0, padding = 0;
2587 struct iscsi_conn *conn = cmd->conn;
2588 struct kvec *iov;
2589 void *overflow_buf = NULL;
2590
2591 BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
2592 rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
2593 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
2594 cmd->orig_iov_data_count - 2,
2595 cmd->write_data_done, rx_size);
2596 if (iov_ret < 0)
2597 return IMMEDIATE_DATA_CANNOT_RECOVER;
2598
2599 iov_count = iov_ret;
2600 iov = &cmd->iov_data[0];
2601 if (rx_size < length) {
2602 /*
2603 * Special case: length of immediate data exceeds the data
2604 * buffer size derived from the CDB.
2605 */
2606 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
2607 if (!overflow_buf) {
2608 iscsit_unmap_iovec(cmd);
2609 return IMMEDIATE_DATA_CANNOT_RECOVER;
2610 }
2611 cmd->overflow_buf = overflow_buf;
2612 iov[iov_count].iov_base = overflow_buf;
2613 iov[iov_count].iov_len = length - rx_size;
2614 iov_count++;
2615 rx_size = length;
2616 }
2617
2618 padding = ((-length) & 3);
2619 if (padding != 0) {
2620 iov[iov_count].iov_base = cmd->pad_bytes;
2621 iov[iov_count++].iov_len = padding;
2622 rx_size += padding;
2623 }
2624
2625 if (conn->conn_ops->DataDigest) {
2626 iov[iov_count].iov_base = &checksum;
2627 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2628 rx_size += ISCSI_CRC_LEN;
2629 }
2630
2631 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
2632 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2633
2634 iscsit_unmap_iovec(cmd);
2635
2636 if (rx_got != rx_size) {
2637 iscsit_rx_thread_wait_for_tcp(conn);
2638 return IMMEDIATE_DATA_CANNOT_RECOVER;
2639 }
2640
2641 if (conn->conn_ops->DataDigest) {
2642 u32 data_crc;
2643
2644 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2645 cmd->write_data_done, length, padding,
2646 cmd->pad_bytes);
2647
2648 if (checksum != data_crc) {
2649 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2650 " does not match computed 0x%08x\n", checksum,
2651 data_crc);
2652
2653 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2654 pr_err("Unable to recover from"
2655 " Immediate Data digest failure while"
2656 " in ERL=0.\n");
2657 iscsit_reject_cmd(cmd,
2658 ISCSI_REASON_DATA_DIGEST_ERROR,
2659 (unsigned char *)hdr);
2660 return IMMEDIATE_DATA_CANNOT_RECOVER;
2661 } else {
2662 iscsit_reject_cmd(cmd,
2663 ISCSI_REASON_DATA_DIGEST_ERROR,
2664 (unsigned char *)hdr);
2665 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2666 }
2667 } else {
2668 pr_debug("Got CRC32C DataDigest 0x%08x for"
2669 " %u bytes of Immediate Data\n", checksum,
2670 length);
2671 }
2672 }
2673
2674 cmd->write_data_done += length;
2675
2676 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2677 spin_lock_bh(&cmd->istate_lock);
2678 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2679 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2680 spin_unlock_bh(&cmd->istate_lock);
2681 }
2682
2683 return IMMEDIATE_DATA_NORMAL_OPERATION;
2684 }
2685
2686 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2687 with active network interface */
2688 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2689 {
2690 struct iscsi_cmd *cmd;
2691 struct iscsi_conn *conn_p;
2692 bool found = false;
2693
2694 lockdep_assert_held(&conn->sess->conn_lock);
2695
2696 /*
2697 * Only send a Asynchronous Message on connections whos network
2698 * interface is still functional.
2699 */
2700 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2701 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2702 iscsit_inc_conn_usage_count(conn_p);
2703 found = true;
2704 break;
2705 }
2706 }
2707
2708 if (!found)
2709 return;
2710
2711 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2712 if (!cmd) {
2713 iscsit_dec_conn_usage_count(conn_p);
2714 return;
2715 }
2716
2717 cmd->logout_cid = conn->cid;
2718 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2719 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2720
2721 spin_lock_bh(&conn_p->cmd_lock);
2722 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2723 spin_unlock_bh(&conn_p->cmd_lock);
2724
2725 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2726 iscsit_dec_conn_usage_count(conn_p);
2727 }
2728
2729 static int iscsit_send_conn_drop_async_message(
2730 struct iscsi_cmd *cmd,
2731 struct iscsi_conn *conn)
2732 {
2733 struct iscsi_async *hdr;
2734
2735 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2736
2737 hdr = (struct iscsi_async *) cmd->pdu;
2738 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2739 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2740 cmd->init_task_tag = RESERVED_ITT;
2741 cmd->targ_xfer_tag = 0xFFFFFFFF;
2742 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2743 cmd->stat_sn = conn->stat_sn++;
2744 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2745 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2746 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2747 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2748 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2749 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2750 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2751
2752 pr_debug("Sending Connection Dropped Async Message StatSN:"
2753 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2754 cmd->logout_cid, conn->cid);
2755
2756 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2757 }
2758
2759 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2760 {
2761 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2762 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2763 wait_for_completion_interruptible_timeout(
2764 &conn->tx_half_close_comp,
2765 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2766 }
2767 }
2768
2769 void
2770 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2771 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2772 bool set_statsn)
2773 {
2774 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2775 hdr->flags = datain->flags;
2776 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2777 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2778 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2779 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2780 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2781 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2782 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2783 }
2784 }
2785 hton24(hdr->dlength, datain->length);
2786 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2787 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2788 (struct scsi_lun *)&hdr->lun);
2789 else
2790 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2791
2792 hdr->itt = cmd->init_task_tag;
2793
2794 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2795 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2796 else
2797 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2798 if (set_statsn)
2799 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2800 else
2801 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2802
2803 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2804 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2805 hdr->datasn = cpu_to_be32(datain->data_sn);
2806 hdr->offset = cpu_to_be32(datain->offset);
2807
2808 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2809 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2810 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2811 ntohl(hdr->offset), datain->length, conn->cid);
2812 }
2813 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2814
2815 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2816 {
2817 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2818 struct iscsi_datain datain;
2819 struct iscsi_datain_req *dr;
2820 int eodr = 0, ret;
2821 bool set_statsn = false;
2822
2823 memset(&datain, 0, sizeof(struct iscsi_datain));
2824 dr = iscsit_get_datain_values(cmd, &datain);
2825 if (!dr) {
2826 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2827 cmd->init_task_tag);
2828 return -1;
2829 }
2830 /*
2831 * Be paranoid and double check the logic for now.
2832 */
2833 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2834 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2835 " datain.length: %u exceeds cmd->data_length: %u\n",
2836 cmd->init_task_tag, datain.offset, datain.length,
2837 cmd->se_cmd.data_length);
2838 return -1;
2839 }
2840
2841 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2842 /*
2843 * Special case for successfully execution w/ both DATAIN
2844 * and Sense Data.
2845 */
2846 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2847 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2848 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2849 else {
2850 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2851 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2852 iscsit_increment_maxcmdsn(cmd, conn->sess);
2853 cmd->stat_sn = conn->stat_sn++;
2854 set_statsn = true;
2855 } else if (dr->dr_complete ==
2856 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2857 set_statsn = true;
2858 }
2859
2860 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2861
2862 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2863 if (ret < 0)
2864 return ret;
2865
2866 if (dr->dr_complete) {
2867 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2868 2 : 1;
2869 iscsit_free_datain_req(cmd, dr);
2870 }
2871
2872 return eodr;
2873 }
2874
2875 int
2876 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2877 struct iscsi_logout_rsp *hdr)
2878 {
2879 struct iscsi_conn *logout_conn = NULL;
2880 struct iscsi_conn_recovery *cr = NULL;
2881 struct iscsi_session *sess = conn->sess;
2882 /*
2883 * The actual shutting down of Sessions and/or Connections
2884 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2885 * is done in scsi_logout_post_handler().
2886 */
2887 switch (cmd->logout_reason) {
2888 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2889 pr_debug("iSCSI session logout successful, setting"
2890 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2891 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2892 break;
2893 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2894 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2895 break;
2896 /*
2897 * For CLOSECONNECTION logout requests carrying
2898 * a matching logout CID -> local CID, the reference
2899 * for the local CID will have been incremented in
2900 * iscsi_logout_closeconnection().
2901 *
2902 * For CLOSECONNECTION logout requests carrying
2903 * a different CID than the connection it arrived
2904 * on, the connection responding to cmd->logout_cid
2905 * is stopped in iscsit_logout_post_handler_diffcid().
2906 */
2907
2908 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2909 " successful.\n", cmd->logout_cid, conn->cid);
2910 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2911 break;
2912 case ISCSI_LOGOUT_REASON_RECOVERY:
2913 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2914 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2915 break;
2916 /*
2917 * If the connection is still active from our point of view
2918 * force connection recovery to occur.
2919 */
2920 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2921 cmd->logout_cid);
2922 if (logout_conn) {
2923 iscsit_connection_reinstatement_rcfr(logout_conn);
2924 iscsit_dec_conn_usage_count(logout_conn);
2925 }
2926
2927 cr = iscsit_get_inactive_connection_recovery_entry(
2928 conn->sess, cmd->logout_cid);
2929 if (!cr) {
2930 pr_err("Unable to locate CID: %hu for"
2931 " REMOVECONNFORRECOVERY Logout Request.\n",
2932 cmd->logout_cid);
2933 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2934 break;
2935 }
2936
2937 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2938
2939 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2940 " for recovery for CID: %hu on CID: %hu successful.\n",
2941 cmd->logout_cid, conn->cid);
2942 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2943 break;
2944 default:
2945 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2946 cmd->logout_reason);
2947 return -1;
2948 }
2949
2950 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2951 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2952 hdr->response = cmd->logout_response;
2953 hdr->itt = cmd->init_task_tag;
2954 cmd->stat_sn = conn->stat_sn++;
2955 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2956
2957 iscsit_increment_maxcmdsn(cmd, conn->sess);
2958 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2959 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2960
2961 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2962 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2963 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2964 cmd->logout_cid, conn->cid);
2965
2966 return 0;
2967 }
2968 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2969
2970 static int
2971 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2972 {
2973 int rc;
2974
2975 rc = iscsit_build_logout_rsp(cmd, conn,
2976 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2977 if (rc < 0)
2978 return rc;
2979
2980 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2981 }
2982
2983 void
2984 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2985 struct iscsi_nopin *hdr, bool nopout_response)
2986 {
2987 hdr->opcode = ISCSI_OP_NOOP_IN;
2988 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2989 hton24(hdr->dlength, cmd->buf_ptr_size);
2990 if (nopout_response)
2991 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2992 hdr->itt = cmd->init_task_tag;
2993 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2994 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2995 conn->stat_sn;
2996 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2997
2998 if (nopout_response)
2999 iscsit_increment_maxcmdsn(cmd, conn->sess);
3000
3001 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3002 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3003
3004 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3005 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3006 "Solicited" : "Unsolicited", cmd->init_task_tag,
3007 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3008 }
3009 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3010
3011 /*
3012 * Unsolicited NOPIN, either requesting a response or not.
3013 */
3014 static int iscsit_send_unsolicited_nopin(
3015 struct iscsi_cmd *cmd,
3016 struct iscsi_conn *conn,
3017 int want_response)
3018 {
3019 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3020 int ret;
3021
3022 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3023
3024 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3025 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3026
3027 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3028 if (ret < 0)
3029 return ret;
3030
3031 spin_lock_bh(&cmd->istate_lock);
3032 cmd->i_state = want_response ?
3033 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3034 spin_unlock_bh(&cmd->istate_lock);
3035
3036 return 0;
3037 }
3038
3039 static int
3040 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3041 {
3042 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3043
3044 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3045
3046 /*
3047 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3048 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3049 */
3050 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3051
3052 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3053 cmd->buf_ptr,
3054 cmd->buf_ptr_size);
3055 }
3056
3057 static int iscsit_send_r2t(
3058 struct iscsi_cmd *cmd,
3059 struct iscsi_conn *conn)
3060 {
3061 struct iscsi_r2t *r2t;
3062 struct iscsi_r2t_rsp *hdr;
3063 int ret;
3064
3065 r2t = iscsit_get_r2t_from_list(cmd);
3066 if (!r2t)
3067 return -1;
3068
3069 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3070 memset(hdr, 0, ISCSI_HDR_LEN);
3071 hdr->opcode = ISCSI_OP_R2T;
3072 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3073 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3074 (struct scsi_lun *)&hdr->lun);
3075 hdr->itt = cmd->init_task_tag;
3076 if (conn->conn_transport->iscsit_get_r2t_ttt)
3077 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3078 else
3079 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3080 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3081 hdr->statsn = cpu_to_be32(conn->stat_sn);
3082 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3083 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3084 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3085 hdr->data_offset = cpu_to_be32(r2t->offset);
3086 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3087
3088 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3089 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3090 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3091 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3092 r2t->offset, r2t->xfer_len, conn->cid);
3093
3094 spin_lock_bh(&cmd->r2t_lock);
3095 r2t->sent_r2t = 1;
3096 spin_unlock_bh(&cmd->r2t_lock);
3097
3098 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3099 if (ret < 0) {
3100 return ret;
3101 }
3102
3103 spin_lock_bh(&cmd->dataout_timeout_lock);
3104 iscsit_start_dataout_timer(cmd, conn);
3105 spin_unlock_bh(&cmd->dataout_timeout_lock);
3106
3107 return 0;
3108 }
3109
3110 /*
3111 * @recovery: If called from iscsi_task_reassign_complete_write() for
3112 * connection recovery.
3113 */
3114 int iscsit_build_r2ts_for_cmd(
3115 struct iscsi_conn *conn,
3116 struct iscsi_cmd *cmd,
3117 bool recovery)
3118 {
3119 int first_r2t = 1;
3120 u32 offset = 0, xfer_len = 0;
3121
3122 spin_lock_bh(&cmd->r2t_lock);
3123 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3124 spin_unlock_bh(&cmd->r2t_lock);
3125 return 0;
3126 }
3127
3128 if (conn->sess->sess_ops->DataSequenceInOrder &&
3129 !recovery)
3130 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3131
3132 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3133 if (conn->sess->sess_ops->DataSequenceInOrder) {
3134 offset = cmd->r2t_offset;
3135
3136 if (first_r2t && recovery) {
3137 int new_data_end = offset +
3138 conn->sess->sess_ops->MaxBurstLength -
3139 cmd->next_burst_len;
3140
3141 if (new_data_end > cmd->se_cmd.data_length)
3142 xfer_len = cmd->se_cmd.data_length - offset;
3143 else
3144 xfer_len =
3145 conn->sess->sess_ops->MaxBurstLength -
3146 cmd->next_burst_len;
3147 } else {
3148 int new_data_end = offset +
3149 conn->sess->sess_ops->MaxBurstLength;
3150
3151 if (new_data_end > cmd->se_cmd.data_length)
3152 xfer_len = cmd->se_cmd.data_length - offset;
3153 else
3154 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3155 }
3156
3157 if ((s32)xfer_len < 0) {
3158 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3159 break;
3160 }
3161
3162 cmd->r2t_offset += xfer_len;
3163
3164 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3165 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3166 } else {
3167 struct iscsi_seq *seq;
3168
3169 seq = iscsit_get_seq_holder_for_r2t(cmd);
3170 if (!seq) {
3171 spin_unlock_bh(&cmd->r2t_lock);
3172 return -1;
3173 }
3174
3175 offset = seq->offset;
3176 xfer_len = seq->xfer_len;
3177
3178 if (cmd->seq_send_order == cmd->seq_count)
3179 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3180 }
3181 cmd->outstanding_r2ts++;
3182 first_r2t = 0;
3183
3184 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3185 spin_unlock_bh(&cmd->r2t_lock);
3186 return -1;
3187 }
3188
3189 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3190 break;
3191 }
3192 spin_unlock_bh(&cmd->r2t_lock);
3193
3194 return 0;
3195 }
3196 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3197
3198 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3199 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3200 {
3201 if (inc_stat_sn)
3202 cmd->stat_sn = conn->stat_sn++;
3203
3204 atomic_long_inc(&conn->sess->rsp_pdus);
3205
3206 memset(hdr, 0, ISCSI_HDR_LEN);
3207 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3208 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3209 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3210 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3211 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3212 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3213 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3214 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3215 }
3216 hdr->response = cmd->iscsi_response;
3217 hdr->cmd_status = cmd->se_cmd.scsi_status;
3218 hdr->itt = cmd->init_task_tag;
3219 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3220
3221 iscsit_increment_maxcmdsn(cmd, conn->sess);
3222 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3223 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3224
3225 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3226 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3227 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3228 cmd->se_cmd.scsi_status, conn->cid);
3229 }
3230 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3231
3232 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3233 {
3234 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3235 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3236 void *data_buf = NULL;
3237 u32 padding = 0, data_buf_len = 0;
3238
3239 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3240
3241 /*
3242 * Attach SENSE DATA payload to iSCSI Response PDU
3243 */
3244 if (cmd->se_cmd.sense_buffer &&
3245 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3246 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3247 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3248 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3249
3250 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3251 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3252 data_buf = cmd->sense_buffer;
3253 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3254
3255 if (padding) {
3256 memset(cmd->sense_buffer +
3257 cmd->se_cmd.scsi_sense_length, 0, padding);
3258 pr_debug("Adding %u bytes of padding to"
3259 " SENSE.\n", padding);
3260 }
3261
3262 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3263 " Response PDU\n",
3264 cmd->se_cmd.scsi_sense_length);
3265 }
3266
3267 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3268 data_buf_len);
3269 }
3270
3271 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3272 {
3273 switch (se_tmr->response) {
3274 case TMR_FUNCTION_COMPLETE:
3275 return ISCSI_TMF_RSP_COMPLETE;
3276 case TMR_TASK_DOES_NOT_EXIST:
3277 return ISCSI_TMF_RSP_NO_TASK;
3278 case TMR_LUN_DOES_NOT_EXIST:
3279 return ISCSI_TMF_RSP_NO_LUN;
3280 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3281 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3282 case TMR_FUNCTION_REJECTED:
3283 default:
3284 return ISCSI_TMF_RSP_REJECTED;
3285 }
3286 }
3287
3288 void
3289 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3290 struct iscsi_tm_rsp *hdr)
3291 {
3292 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3293
3294 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3295 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3296 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3297 hdr->itt = cmd->init_task_tag;
3298 cmd->stat_sn = conn->stat_sn++;
3299 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3300
3301 iscsit_increment_maxcmdsn(cmd, conn->sess);
3302 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3303 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3304
3305 pr_debug("Built Task Management Response ITT: 0x%08x,"
3306 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3307 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3308 }
3309 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3310
3311 static int
3312 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3313 {
3314 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3315
3316 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3317
3318 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3319 }
3320
3321 #define SENDTARGETS_BUF_LIMIT 32768U
3322
3323 static int
3324 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3325 enum iscsit_transport_type network_transport,
3326 int skip_bytes, bool *completed)
3327 {
3328 char *payload = NULL;
3329 struct iscsi_conn *conn = cmd->conn;
3330 struct iscsi_portal_group *tpg;
3331 struct iscsi_tiqn *tiqn;
3332 struct iscsi_tpg_np *tpg_np;
3333 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3334 int target_name_printed;
3335 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3336 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3337 bool active;
3338
3339 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3340 SENDTARGETS_BUF_LIMIT);
3341
3342 payload = kzalloc(buffer_len, GFP_KERNEL);
3343 if (!payload)
3344 return -ENOMEM;
3345
3346 /*
3347 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3348 * explicit case..
3349 */
3350 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3351 text_ptr = strchr(text_in, '=');
3352 if (!text_ptr) {
3353 pr_err("Unable to locate '=' string in text_in:"
3354 " %s\n", text_in);
3355 kfree(payload);
3356 return -EINVAL;
3357 }
3358 /*
3359 * Skip over '=' character..
3360 */
3361 text_ptr += 1;
3362 }
3363
3364 spin_lock(&tiqn_lock);
3365 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3366 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3367 strcmp(tiqn->tiqn, text_ptr)) {
3368 continue;
3369 }
3370
3371 target_name_printed = 0;
3372
3373 spin_lock(&tiqn->tiqn_tpg_lock);
3374 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3375
3376 /* If demo_mode_discovery=0 and generate_node_acls=0
3377 * (demo mode dislabed) do not return
3378 * TargetName+TargetAddress unless a NodeACL exists.
3379 */
3380
3381 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3382 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3383 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3384 cmd->conn->sess->sess_ops->InitiatorName))) {
3385 continue;
3386 }
3387
3388 spin_lock(&tpg->tpg_state_lock);
3389 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3390 spin_unlock(&tpg->tpg_state_lock);
3391
3392 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3393 continue;
3394
3395 spin_lock(&tpg->tpg_np_lock);
3396 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3397 tpg_np_list) {
3398 struct iscsi_np *np = tpg_np->tpg_np;
3399 struct sockaddr_storage *sockaddr;
3400
3401 if (np->np_network_transport != network_transport)
3402 continue;
3403
3404 if (!target_name_printed) {
3405 len = sprintf(buf, "TargetName=%s",
3406 tiqn->tiqn);
3407 len += 1;
3408
3409 if ((len + payload_len) > buffer_len) {
3410 spin_unlock(&tpg->tpg_np_lock);
3411 spin_unlock(&tiqn->tiqn_tpg_lock);
3412 end_of_buf = 1;
3413 goto eob;
3414 }
3415
3416 if (skip_bytes && len <= skip_bytes) {
3417 skip_bytes -= len;
3418 } else {
3419 memcpy(payload + payload_len, buf, len);
3420 payload_len += len;
3421 target_name_printed = 1;
3422 if (len > skip_bytes)
3423 skip_bytes = 0;
3424 }
3425 }
3426
3427 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3428 sockaddr = &conn->local_sockaddr;
3429 else
3430 sockaddr = &np->np_sockaddr;
3431
3432 len = sprintf(buf, "TargetAddress="
3433 "%pISpc,%hu",
3434 sockaddr,
3435 tpg->tpgt);
3436 len += 1;
3437
3438 if ((len + payload_len) > buffer_len) {
3439 spin_unlock(&tpg->tpg_np_lock);
3440 spin_unlock(&tiqn->tiqn_tpg_lock);
3441 end_of_buf = 1;
3442 goto eob;
3443 }
3444
3445 if (skip_bytes && len <= skip_bytes) {
3446 skip_bytes -= len;
3447 } else {
3448 memcpy(payload + payload_len, buf, len);
3449 payload_len += len;
3450 if (len > skip_bytes)
3451 skip_bytes = 0;
3452 }
3453 }
3454 spin_unlock(&tpg->tpg_np_lock);
3455 }
3456 spin_unlock(&tiqn->tiqn_tpg_lock);
3457 eob:
3458 if (end_of_buf) {
3459 *completed = false;
3460 break;
3461 }
3462
3463 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3464 break;
3465 }
3466 spin_unlock(&tiqn_lock);
3467
3468 cmd->buf_ptr = payload;
3469
3470 return payload_len;
3471 }
3472
3473 int
3474 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3475 struct iscsi_text_rsp *hdr,
3476 enum iscsit_transport_type network_transport)
3477 {
3478 int text_length, padding;
3479 bool completed = true;
3480
3481 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3482 cmd->read_data_done,
3483 &completed);
3484 if (text_length < 0)
3485 return text_length;
3486
3487 if (completed) {
3488 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3489 } else {
3490 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3491 cmd->read_data_done += text_length;
3492 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3493 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3494 }
3495 hdr->opcode = ISCSI_OP_TEXT_RSP;
3496 padding = ((-text_length) & 3);
3497 hton24(hdr->dlength, text_length);
3498 hdr->itt = cmd->init_task_tag;
3499 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3500 cmd->stat_sn = conn->stat_sn++;
3501 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3502
3503 iscsit_increment_maxcmdsn(cmd, conn->sess);
3504 /*
3505 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3506 * correctly increment MaxCmdSN for each response answering a
3507 * non immediate text request with a valid CmdSN.
3508 */
3509 cmd->maxcmdsn_inc = 0;
3510 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3511 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3512
3513 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3514 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3515 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3516 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3517 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3518
3519 return text_length + padding;
3520 }
3521 EXPORT_SYMBOL(iscsit_build_text_rsp);
3522
3523 static int iscsit_send_text_rsp(
3524 struct iscsi_cmd *cmd,
3525 struct iscsi_conn *conn)
3526 {
3527 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3528 int text_length;
3529
3530 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3531 conn->conn_transport->transport_type);
3532 if (text_length < 0)
3533 return text_length;
3534
3535 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3536 cmd->buf_ptr,
3537 text_length);
3538 }
3539
3540 void
3541 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3542 struct iscsi_reject *hdr)
3543 {
3544 hdr->opcode = ISCSI_OP_REJECT;
3545 hdr->reason = cmd->reject_reason;
3546 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3547 hton24(hdr->dlength, ISCSI_HDR_LEN);
3548 hdr->ffffffff = cpu_to_be32(0xffffffff);
3549 cmd->stat_sn = conn->stat_sn++;
3550 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3551 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3552 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3553
3554 }
3555 EXPORT_SYMBOL(iscsit_build_reject);
3556
3557 static int iscsit_send_reject(
3558 struct iscsi_cmd *cmd,
3559 struct iscsi_conn *conn)
3560 {
3561 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3562
3563 iscsit_build_reject(cmd, conn, hdr);
3564
3565 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3566 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3567
3568 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3569 cmd->buf_ptr,
3570 ISCSI_HDR_LEN);
3571 }
3572
3573 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3574 {
3575 int ord, cpu;
3576 /*
3577 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3578 * within iscsit_start_kthreads()
3579 *
3580 * Here we use bitmap_id to determine which CPU that this
3581 * iSCSI connection's RX/TX threads will be scheduled to
3582 * execute upon.
3583 */
3584 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3585 for_each_online_cpu(cpu) {
3586 if (ord-- == 0) {
3587 cpumask_set_cpu(cpu, conn->conn_cpumask);
3588 return;
3589 }
3590 }
3591 /*
3592 * This should never be reached..
3593 */
3594 dump_stack();
3595 cpumask_setall(conn->conn_cpumask);
3596 }
3597
3598 int
3599 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3600 {
3601 int ret;
3602
3603 switch (state) {
3604 case ISTATE_SEND_R2T:
3605 ret = iscsit_send_r2t(cmd, conn);
3606 if (ret < 0)
3607 goto err;
3608 break;
3609 case ISTATE_REMOVE:
3610 spin_lock_bh(&conn->cmd_lock);
3611 list_del_init(&cmd->i_conn_node);
3612 spin_unlock_bh(&conn->cmd_lock);
3613
3614 iscsit_free_cmd(cmd, false);
3615 break;
3616 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3617 iscsit_mod_nopin_response_timer(conn);
3618 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3619 if (ret < 0)
3620 goto err;
3621 break;
3622 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3623 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3624 if (ret < 0)
3625 goto err;
3626 break;
3627 default:
3628 pr_err("Unknown Opcode: 0x%02x ITT:"
3629 " 0x%08x, i_state: %d on CID: %hu\n",
3630 cmd->iscsi_opcode, cmd->init_task_tag, state,
3631 conn->cid);
3632 goto err;
3633 }
3634
3635 return 0;
3636
3637 err:
3638 return -1;
3639 }
3640 EXPORT_SYMBOL(iscsit_immediate_queue);
3641
3642 static int
3643 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3644 {
3645 struct iscsit_transport *t = conn->conn_transport;
3646 struct iscsi_queue_req *qr;
3647 struct iscsi_cmd *cmd;
3648 u8 state;
3649 int ret;
3650
3651 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3652 atomic_set(&conn->check_immediate_queue, 0);
3653 cmd = qr->cmd;
3654 state = qr->state;
3655 kmem_cache_free(lio_qr_cache, qr);
3656
3657 ret = t->iscsit_immediate_queue(conn, cmd, state);
3658 if (ret < 0)
3659 return ret;
3660 }
3661
3662 return 0;
3663 }
3664
3665 int
3666 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3667 {
3668 int ret;
3669
3670 check_rsp_state:
3671 switch (state) {
3672 case ISTATE_SEND_DATAIN:
3673 ret = iscsit_send_datain(cmd, conn);
3674 if (ret < 0)
3675 goto err;
3676 else if (!ret)
3677 /* more drs */
3678 goto check_rsp_state;
3679 else if (ret == 1) {
3680 /* all done */
3681 spin_lock_bh(&cmd->istate_lock);
3682 cmd->i_state = ISTATE_SENT_STATUS;
3683 spin_unlock_bh(&cmd->istate_lock);
3684
3685 if (atomic_read(&conn->check_immediate_queue))
3686 return 1;
3687
3688 return 0;
3689 } else if (ret == 2) {
3690 /* Still must send status,
3691 SCF_TRANSPORT_TASK_SENSE was set */
3692 spin_lock_bh(&cmd->istate_lock);
3693 cmd->i_state = ISTATE_SEND_STATUS;
3694 spin_unlock_bh(&cmd->istate_lock);
3695 state = ISTATE_SEND_STATUS;
3696 goto check_rsp_state;
3697 }
3698
3699 break;
3700 case ISTATE_SEND_STATUS:
3701 case ISTATE_SEND_STATUS_RECOVERY:
3702 ret = iscsit_send_response(cmd, conn);
3703 break;
3704 case ISTATE_SEND_LOGOUTRSP:
3705 ret = iscsit_send_logout(cmd, conn);
3706 break;
3707 case ISTATE_SEND_ASYNCMSG:
3708 ret = iscsit_send_conn_drop_async_message(
3709 cmd, conn);
3710 break;
3711 case ISTATE_SEND_NOPIN:
3712 ret = iscsit_send_nopin(cmd, conn);
3713 break;
3714 case ISTATE_SEND_REJECT:
3715 ret = iscsit_send_reject(cmd, conn);
3716 break;
3717 case ISTATE_SEND_TASKMGTRSP:
3718 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3719 if (ret != 0)
3720 break;
3721 ret = iscsit_tmr_post_handler(cmd, conn);
3722 if (ret != 0)
3723 iscsit_fall_back_to_erl0(conn->sess);
3724 break;
3725 case ISTATE_SEND_TEXTRSP:
3726 ret = iscsit_send_text_rsp(cmd, conn);
3727 break;
3728 default:
3729 pr_err("Unknown Opcode: 0x%02x ITT:"
3730 " 0x%08x, i_state: %d on CID: %hu\n",
3731 cmd->iscsi_opcode, cmd->init_task_tag,
3732 state, conn->cid);
3733 goto err;
3734 }
3735 if (ret < 0)
3736 goto err;
3737
3738 switch (state) {
3739 case ISTATE_SEND_LOGOUTRSP:
3740 if (!iscsit_logout_post_handler(cmd, conn))
3741 return -ECONNRESET;
3742 /* fall through */
3743 case ISTATE_SEND_STATUS:
3744 case ISTATE_SEND_ASYNCMSG:
3745 case ISTATE_SEND_NOPIN:
3746 case ISTATE_SEND_STATUS_RECOVERY:
3747 case ISTATE_SEND_TEXTRSP:
3748 case ISTATE_SEND_TASKMGTRSP:
3749 case ISTATE_SEND_REJECT:
3750 spin_lock_bh(&cmd->istate_lock);
3751 cmd->i_state = ISTATE_SENT_STATUS;
3752 spin_unlock_bh(&cmd->istate_lock);
3753 break;
3754 default:
3755 pr_err("Unknown Opcode: 0x%02x ITT:"
3756 " 0x%08x, i_state: %d on CID: %hu\n",
3757 cmd->iscsi_opcode, cmd->init_task_tag,
3758 cmd->i_state, conn->cid);
3759 goto err;
3760 }
3761
3762 if (atomic_read(&conn->check_immediate_queue))
3763 return 1;
3764
3765 return 0;
3766
3767 err:
3768 return -1;
3769 }
3770 EXPORT_SYMBOL(iscsit_response_queue);
3771
3772 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3773 {
3774 struct iscsit_transport *t = conn->conn_transport;
3775 struct iscsi_queue_req *qr;
3776 struct iscsi_cmd *cmd;
3777 u8 state;
3778 int ret;
3779
3780 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3781 cmd = qr->cmd;
3782 state = qr->state;
3783 kmem_cache_free(lio_qr_cache, qr);
3784
3785 ret = t->iscsit_response_queue(conn, cmd, state);
3786 if (ret == 1 || ret < 0)
3787 return ret;
3788 }
3789
3790 return 0;
3791 }
3792
3793 int iscsi_target_tx_thread(void *arg)
3794 {
3795 int ret = 0;
3796 struct iscsi_conn *conn = arg;
3797 bool conn_freed = false;
3798
3799 /*
3800 * Allow ourselves to be interrupted by SIGINT so that a
3801 * connection recovery / failure event can be triggered externally.
3802 */
3803 allow_signal(SIGINT);
3804
3805 while (!kthread_should_stop()) {
3806 /*
3807 * Ensure that both TX and RX per connection kthreads
3808 * are scheduled to run on the same CPU.
3809 */
3810 iscsit_thread_check_cpumask(conn, current, 1);
3811
3812 wait_event_interruptible(conn->queues_wq,
3813 !iscsit_conn_all_queues_empty(conn));
3814
3815 if (signal_pending(current))
3816 goto transport_err;
3817
3818 get_immediate:
3819 ret = iscsit_handle_immediate_queue(conn);
3820 if (ret < 0)
3821 goto transport_err;
3822
3823 ret = iscsit_handle_response_queue(conn);
3824 if (ret == 1) {
3825 goto get_immediate;
3826 } else if (ret == -ECONNRESET) {
3827 conn_freed = true;
3828 goto out;
3829 } else if (ret < 0) {
3830 goto transport_err;
3831 }
3832 }
3833
3834 transport_err:
3835 /*
3836 * Avoid the normal connection failure code-path if this connection
3837 * is still within LOGIN mode, and iscsi_np process context is
3838 * responsible for cleaning up the early connection failure.
3839 */
3840 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3841 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3842 out:
3843 if (!conn_freed) {
3844 while (!kthread_should_stop()) {
3845 msleep(100);
3846 }
3847 }
3848 return 0;
3849 }
3850
3851 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3852 {
3853 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3854 struct iscsi_cmd *cmd;
3855 int ret = 0;
3856
3857 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3858 case ISCSI_OP_SCSI_CMD:
3859 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3860 if (!cmd)
3861 goto reject;
3862
3863 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3864 break;
3865 case ISCSI_OP_SCSI_DATA_OUT:
3866 ret = iscsit_handle_data_out(conn, buf);
3867 break;
3868 case ISCSI_OP_NOOP_OUT:
3869 cmd = NULL;
3870 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3871 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3872 if (!cmd)
3873 goto reject;
3874 }
3875 ret = iscsit_handle_nop_out(conn, cmd, buf);
3876 break;
3877 case ISCSI_OP_SCSI_TMFUNC:
3878 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3879 if (!cmd)
3880 goto reject;
3881
3882 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3883 break;
3884 case ISCSI_OP_TEXT:
3885 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3886 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3887 if (!cmd)
3888 goto reject;
3889 } else {
3890 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3891 if (!cmd)
3892 goto reject;
3893 }
3894
3895 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3896 break;
3897 case ISCSI_OP_LOGOUT:
3898 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3899 if (!cmd)
3900 goto reject;
3901
3902 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3903 if (ret > 0)
3904 wait_for_completion_timeout(&conn->conn_logout_comp,
3905 SECONDS_FOR_LOGOUT_COMP * HZ);
3906 break;
3907 case ISCSI_OP_SNACK:
3908 ret = iscsit_handle_snack(conn, buf);
3909 break;
3910 default:
3911 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3912 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3913 pr_err("Cannot recover from unknown"
3914 " opcode while ERL=0, closing iSCSI connection.\n");
3915 return -1;
3916 }
3917 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3918 " closing iSCSI connection.\n");
3919 ret = -1;
3920 break;
3921 }
3922
3923 return ret;
3924 reject:
3925 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3926 }
3927
3928 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3929 {
3930 bool ret;
3931
3932 spin_lock_bh(&conn->state_lock);
3933 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3934 spin_unlock_bh(&conn->state_lock);
3935
3936 return ret;
3937 }
3938
3939 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3940 {
3941 int ret;
3942 u8 *buffer, opcode;
3943 u32 checksum = 0, digest = 0;
3944 struct kvec iov;
3945
3946 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3947 if (!buffer)
3948 return;
3949
3950 while (!kthread_should_stop()) {
3951 /*
3952 * Ensure that both TX and RX per connection kthreads
3953 * are scheduled to run on the same CPU.
3954 */
3955 iscsit_thread_check_cpumask(conn, current, 0);
3956
3957 memset(&iov, 0, sizeof(struct kvec));
3958
3959 iov.iov_base = buffer;
3960 iov.iov_len = ISCSI_HDR_LEN;
3961
3962 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3963 if (ret != ISCSI_HDR_LEN) {
3964 iscsit_rx_thread_wait_for_tcp(conn);
3965 break;
3966 }
3967
3968 if (conn->conn_ops->HeaderDigest) {
3969 iov.iov_base = &digest;
3970 iov.iov_len = ISCSI_CRC_LEN;
3971
3972 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3973 if (ret != ISCSI_CRC_LEN) {
3974 iscsit_rx_thread_wait_for_tcp(conn);
3975 break;
3976 }
3977
3978 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3979 ISCSI_HDR_LEN, 0, NULL,
3980 &checksum);
3981
3982 if (digest != checksum) {
3983 pr_err("HeaderDigest CRC32C failed,"
3984 " received 0x%08x, computed 0x%08x\n",
3985 digest, checksum);
3986 /*
3987 * Set the PDU to 0xff so it will intentionally
3988 * hit default in the switch below.
3989 */
3990 memset(buffer, 0xff, ISCSI_HDR_LEN);
3991 atomic_long_inc(&conn->sess->conn_digest_errors);
3992 } else {
3993 pr_debug("Got HeaderDigest CRC32C"
3994 " 0x%08x\n", checksum);
3995 }
3996 }
3997
3998 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3999 break;
4000
4001 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4002
4003 if (conn->sess->sess_ops->SessionType &&
4004 ((!(opcode & ISCSI_OP_TEXT)) ||
4005 (!(opcode & ISCSI_OP_LOGOUT)))) {
4006 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4007 " while in Discovery Session, rejecting.\n", opcode);
4008 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4009 buffer);
4010 break;
4011 }
4012
4013 ret = iscsi_target_rx_opcode(conn, buffer);
4014 if (ret < 0)
4015 break;
4016 }
4017
4018 kfree(buffer);
4019 }
4020
4021 int iscsi_target_rx_thread(void *arg)
4022 {
4023 int rc;
4024 struct iscsi_conn *conn = arg;
4025 bool conn_freed = false;
4026
4027 /*
4028 * Allow ourselves to be interrupted by SIGINT so that a
4029 * connection recovery / failure event can be triggered externally.
4030 */
4031 allow_signal(SIGINT);
4032 /*
4033 * Wait for iscsi_post_login_handler() to complete before allowing
4034 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4035 */
4036 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4037 if (rc < 0 || iscsi_target_check_conn_state(conn))
4038 goto out;
4039
4040 if (!conn->conn_transport->iscsit_get_rx_pdu)
4041 return 0;
4042
4043 conn->conn_transport->iscsit_get_rx_pdu(conn);
4044
4045 if (!signal_pending(current))
4046 atomic_set(&conn->transport_failed, 1);
4047 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4048
4049 out:
4050 if (!conn_freed) {
4051 while (!kthread_should_stop()) {
4052 msleep(100);
4053 }
4054 }
4055
4056 return 0;
4057 }
4058
4059 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4060 {
4061 LIST_HEAD(tmp_list);
4062 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4063 struct iscsi_session *sess = conn->sess;
4064 /*
4065 * We expect this function to only ever be called from either RX or TX
4066 * thread context via iscsit_close_connection() once the other context
4067 * has been reset -> returned sleeping pre-handler state.
4068 */
4069 spin_lock_bh(&conn->cmd_lock);
4070 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4071
4072 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4073 struct se_cmd *se_cmd = &cmd->se_cmd;
4074
4075 if (se_cmd->se_tfo != NULL) {
4076 spin_lock_irq(&se_cmd->t_state_lock);
4077 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4078 spin_unlock_irq(&se_cmd->t_state_lock);
4079 }
4080 }
4081 spin_unlock_bh(&conn->cmd_lock);
4082
4083 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4084 list_del_init(&cmd->i_conn_node);
4085
4086 iscsit_increment_maxcmdsn(cmd, sess);
4087 iscsit_free_cmd(cmd, true);
4088
4089 }
4090 }
4091
4092 static void iscsit_stop_timers_for_cmds(
4093 struct iscsi_conn *conn)
4094 {
4095 struct iscsi_cmd *cmd;
4096
4097 spin_lock_bh(&conn->cmd_lock);
4098 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4099 if (cmd->data_direction == DMA_TO_DEVICE)
4100 iscsit_stop_dataout_timer(cmd);
4101 }
4102 spin_unlock_bh(&conn->cmd_lock);
4103 }
4104
4105 int iscsit_close_connection(
4106 struct iscsi_conn *conn)
4107 {
4108 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4109 struct iscsi_session *sess = conn->sess;
4110
4111 pr_debug("Closing iSCSI connection CID %hu on SID:"
4112 " %u\n", conn->cid, sess->sid);
4113 /*
4114 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4115 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4116 * sleeping and the logout response never got sent because the
4117 * connection failed.
4118 *
4119 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4120 * to signal logout response TX interrupt completion. Go ahead and skip
4121 * this for iser since isert_rx_opcode() does not wait on logout failure,
4122 * and to avoid iscsi_conn pointer dereference in iser-target code.
4123 */
4124 if (!conn->conn_transport->rdma_shutdown)
4125 complete(&conn->conn_logout_comp);
4126
4127 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4128 if (conn->tx_thread &&
4129 cmpxchg(&conn->tx_thread_active, true, false)) {
4130 send_sig(SIGINT, conn->tx_thread, 1);
4131 kthread_stop(conn->tx_thread);
4132 }
4133 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4134 if (conn->rx_thread &&
4135 cmpxchg(&conn->rx_thread_active, true, false)) {
4136 send_sig(SIGINT, conn->rx_thread, 1);
4137 kthread_stop(conn->rx_thread);
4138 }
4139 }
4140
4141 spin_lock(&iscsit_global->ts_bitmap_lock);
4142 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4143 get_order(1));
4144 spin_unlock(&iscsit_global->ts_bitmap_lock);
4145
4146 iscsit_stop_timers_for_cmds(conn);
4147 iscsit_stop_nopin_response_timer(conn);
4148 iscsit_stop_nopin_timer(conn);
4149
4150 if (conn->conn_transport->iscsit_wait_conn)
4151 conn->conn_transport->iscsit_wait_conn(conn);
4152
4153 /*
4154 * During Connection recovery drop unacknowledged out of order
4155 * commands for this connection, and prepare the other commands
4156 * for reallegiance.
4157 *
4158 * During normal operation clear the out of order commands (but
4159 * do not free the struct iscsi_ooo_cmdsn's) and release all
4160 * struct iscsi_cmds.
4161 */
4162 if (atomic_read(&conn->connection_recovery)) {
4163 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4164 iscsit_prepare_cmds_for_reallegiance(conn);
4165 } else {
4166 iscsit_clear_ooo_cmdsns_for_conn(conn);
4167 iscsit_release_commands_from_conn(conn);
4168 }
4169 iscsit_free_queue_reqs_for_conn(conn);
4170
4171 /*
4172 * Handle decrementing session or connection usage count if
4173 * a logout response was not able to be sent because the
4174 * connection failed. Fall back to Session Recovery here.
4175 */
4176 if (atomic_read(&conn->conn_logout_remove)) {
4177 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4178 iscsit_dec_conn_usage_count(conn);
4179 iscsit_dec_session_usage_count(sess);
4180 }
4181 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4182 iscsit_dec_conn_usage_count(conn);
4183
4184 atomic_set(&conn->conn_logout_remove, 0);
4185 atomic_set(&sess->session_reinstatement, 0);
4186 atomic_set(&sess->session_fall_back_to_erl0, 1);
4187 }
4188
4189 spin_lock_bh(&sess->conn_lock);
4190 list_del(&conn->conn_list);
4191
4192 /*
4193 * Attempt to let the Initiator know this connection failed by
4194 * sending an Connection Dropped Async Message on another
4195 * active connection.
4196 */
4197 if (atomic_read(&conn->connection_recovery))
4198 iscsit_build_conn_drop_async_message(conn);
4199
4200 spin_unlock_bh(&sess->conn_lock);
4201
4202 /*
4203 * If connection reinstatement is being performed on this connection,
4204 * up the connection reinstatement semaphore that is being blocked on
4205 * in iscsit_cause_connection_reinstatement().
4206 */
4207 spin_lock_bh(&conn->state_lock);
4208 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4209 spin_unlock_bh(&conn->state_lock);
4210 complete(&conn->conn_wait_comp);
4211 wait_for_completion(&conn->conn_post_wait_comp);
4212 spin_lock_bh(&conn->state_lock);
4213 }
4214
4215 /*
4216 * If connection reinstatement is being performed on this connection
4217 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4218 * connection wait rcfr semaphore that is being blocked on
4219 * an iscsit_connection_reinstatement_rcfr().
4220 */
4221 if (atomic_read(&conn->connection_wait_rcfr)) {
4222 spin_unlock_bh(&conn->state_lock);
4223 complete(&conn->conn_wait_rcfr_comp);
4224 wait_for_completion(&conn->conn_post_wait_comp);
4225 spin_lock_bh(&conn->state_lock);
4226 }
4227 atomic_set(&conn->connection_reinstatement, 1);
4228 spin_unlock_bh(&conn->state_lock);
4229
4230 /*
4231 * If any other processes are accessing this connection pointer we
4232 * must wait until they have completed.
4233 */
4234 iscsit_check_conn_usage_count(conn);
4235
4236 ahash_request_free(conn->conn_tx_hash);
4237 if (conn->conn_rx_hash) {
4238 struct crypto_ahash *tfm;
4239
4240 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4241 ahash_request_free(conn->conn_rx_hash);
4242 crypto_free_ahash(tfm);
4243 }
4244
4245 if (conn->sock)
4246 sock_release(conn->sock);
4247
4248 if (conn->conn_transport->iscsit_free_conn)
4249 conn->conn_transport->iscsit_free_conn(conn);
4250
4251 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4252 conn->conn_state = TARG_CONN_STATE_FREE;
4253 iscsit_free_conn(conn);
4254
4255 spin_lock_bh(&sess->conn_lock);
4256 atomic_dec(&sess->nconn);
4257 pr_debug("Decremented iSCSI connection count to %hu from node:"
4258 " %s\n", atomic_read(&sess->nconn),
4259 sess->sess_ops->InitiatorName);
4260 /*
4261 * Make sure that if one connection fails in an non ERL=2 iSCSI
4262 * Session that they all fail.
4263 */
4264 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4265 !atomic_read(&sess->session_logout))
4266 atomic_set(&sess->session_fall_back_to_erl0, 1);
4267
4268 /*
4269 * If this was not the last connection in the session, and we are
4270 * performing session reinstatement or falling back to ERL=0, call
4271 * iscsit_stop_session() without sleeping to shutdown the other
4272 * active connections.
4273 */
4274 if (atomic_read(&sess->nconn)) {
4275 if (!atomic_read(&sess->session_reinstatement) &&
4276 !atomic_read(&sess->session_fall_back_to_erl0)) {
4277 spin_unlock_bh(&sess->conn_lock);
4278 return 0;
4279 }
4280 if (!atomic_read(&sess->session_stop_active)) {
4281 atomic_set(&sess->session_stop_active, 1);
4282 spin_unlock_bh(&sess->conn_lock);
4283 iscsit_stop_session(sess, 0, 0);
4284 return 0;
4285 }
4286 spin_unlock_bh(&sess->conn_lock);
4287 return 0;
4288 }
4289
4290 /*
4291 * If this was the last connection in the session and one of the
4292 * following is occurring:
4293 *
4294 * Session Reinstatement is not being performed, and are falling back
4295 * to ERL=0 call iscsit_close_session().
4296 *
4297 * Session Logout was requested. iscsit_close_session() will be called
4298 * elsewhere.
4299 *
4300 * Session Continuation is not being performed, start the Time2Retain
4301 * handler and check if sleep_on_sess_wait_sem is active.
4302 */
4303 if (!atomic_read(&sess->session_reinstatement) &&
4304 atomic_read(&sess->session_fall_back_to_erl0)) {
4305 spin_unlock_bh(&sess->conn_lock);
4306 iscsit_close_session(sess);
4307
4308 return 0;
4309 } else if (atomic_read(&sess->session_logout)) {
4310 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4311 sess->session_state = TARG_SESS_STATE_FREE;
4312 spin_unlock_bh(&sess->conn_lock);
4313
4314 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4315 complete(&sess->session_wait_comp);
4316
4317 return 0;
4318 } else {
4319 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4320 sess->session_state = TARG_SESS_STATE_FAILED;
4321
4322 if (!atomic_read(&sess->session_continuation)) {
4323 spin_unlock_bh(&sess->conn_lock);
4324 iscsit_start_time2retain_handler(sess);
4325 } else
4326 spin_unlock_bh(&sess->conn_lock);
4327
4328 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4329 complete(&sess->session_wait_comp);
4330
4331 return 0;
4332 }
4333 }
4334
4335 /*
4336 * If the iSCSI Session for the iSCSI Initiator Node exists,
4337 * forcefully shutdown the iSCSI NEXUS.
4338 */
4339 int iscsit_close_session(struct iscsi_session *sess)
4340 {
4341 struct iscsi_portal_group *tpg = sess->tpg;
4342 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4343
4344 if (atomic_read(&sess->nconn)) {
4345 pr_err("%d connection(s) still exist for iSCSI session"
4346 " to %s\n", atomic_read(&sess->nconn),
4347 sess->sess_ops->InitiatorName);
4348 BUG();
4349 }
4350
4351 spin_lock_bh(&se_tpg->session_lock);
4352 atomic_set(&sess->session_logout, 1);
4353 atomic_set(&sess->session_reinstatement, 1);
4354 iscsit_stop_time2retain_timer(sess);
4355 spin_unlock_bh(&se_tpg->session_lock);
4356
4357 /*
4358 * transport_deregister_session_configfs() will clear the
4359 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4360 * can be setting it again with __transport_register_session() in
4361 * iscsi_post_login_handler() again after the iscsit_stop_session()
4362 * completes in iscsi_np context.
4363 */
4364 transport_deregister_session_configfs(sess->se_sess);
4365
4366 /*
4367 * If any other processes are accessing this session pointer we must
4368 * wait until they have completed. If we are in an interrupt (the
4369 * time2retain handler) and contain and active session usage count we
4370 * restart the timer and exit.
4371 */
4372 if (!in_interrupt()) {
4373 if (iscsit_check_session_usage_count(sess) == 1)
4374 iscsit_stop_session(sess, 1, 1);
4375 } else {
4376 if (iscsit_check_session_usage_count(sess) == 2) {
4377 atomic_set(&sess->session_logout, 0);
4378 iscsit_start_time2retain_handler(sess);
4379 return 0;
4380 }
4381 }
4382
4383 transport_deregister_session(sess->se_sess);
4384
4385 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4386 iscsit_free_connection_recovery_entries(sess);
4387
4388 iscsit_free_all_ooo_cmdsns(sess);
4389
4390 spin_lock_bh(&se_tpg->session_lock);
4391 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4392 sess->session_state = TARG_SESS_STATE_FREE;
4393 pr_debug("Released iSCSI session from node: %s\n",
4394 sess->sess_ops->InitiatorName);
4395 tpg->nsessions--;
4396 if (tpg->tpg_tiqn)
4397 tpg->tpg_tiqn->tiqn_nsessions--;
4398
4399 pr_debug("Decremented number of active iSCSI Sessions on"
4400 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4401
4402 ida_free(&sess_ida, sess->session_index);
4403 kfree(sess->sess_ops);
4404 sess->sess_ops = NULL;
4405 spin_unlock_bh(&se_tpg->session_lock);
4406
4407 kfree(sess);
4408 return 0;
4409 }
4410
4411 static void iscsit_logout_post_handler_closesession(
4412 struct iscsi_conn *conn)
4413 {
4414 struct iscsi_session *sess = conn->sess;
4415 int sleep = 1;
4416 /*
4417 * Traditional iscsi/tcp will invoke this logic from TX thread
4418 * context during session logout, so clear tx_thread_active and
4419 * sleep if iscsit_close_connection() has not already occured.
4420 *
4421 * Since iser-target invokes this logic from it's own workqueue,
4422 * always sleep waiting for RX/TX thread shutdown to complete
4423 * within iscsit_close_connection().
4424 */
4425 if (!conn->conn_transport->rdma_shutdown) {
4426 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4427 if (!sleep)
4428 return;
4429 }
4430
4431 atomic_set(&conn->conn_logout_remove, 0);
4432 complete(&conn->conn_logout_comp);
4433
4434 iscsit_dec_conn_usage_count(conn);
4435 iscsit_stop_session(sess, sleep, sleep);
4436 iscsit_dec_session_usage_count(sess);
4437 iscsit_close_session(sess);
4438 }
4439
4440 static void iscsit_logout_post_handler_samecid(
4441 struct iscsi_conn *conn)
4442 {
4443 int sleep = 1;
4444
4445 if (!conn->conn_transport->rdma_shutdown) {
4446 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4447 if (!sleep)
4448 return;
4449 }
4450
4451 atomic_set(&conn->conn_logout_remove, 0);
4452 complete(&conn->conn_logout_comp);
4453
4454 iscsit_cause_connection_reinstatement(conn, sleep);
4455 iscsit_dec_conn_usage_count(conn);
4456 }
4457
4458 static void iscsit_logout_post_handler_diffcid(
4459 struct iscsi_conn *conn,
4460 u16 cid)
4461 {
4462 struct iscsi_conn *l_conn;
4463 struct iscsi_session *sess = conn->sess;
4464 bool conn_found = false;
4465
4466 if (!sess)
4467 return;
4468
4469 spin_lock_bh(&sess->conn_lock);
4470 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4471 if (l_conn->cid == cid) {
4472 iscsit_inc_conn_usage_count(l_conn);
4473 conn_found = true;
4474 break;
4475 }
4476 }
4477 spin_unlock_bh(&sess->conn_lock);
4478
4479 if (!conn_found)
4480 return;
4481
4482 if (l_conn->sock)
4483 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4484
4485 spin_lock_bh(&l_conn->state_lock);
4486 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4487 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4488 spin_unlock_bh(&l_conn->state_lock);
4489
4490 iscsit_cause_connection_reinstatement(l_conn, 1);
4491 iscsit_dec_conn_usage_count(l_conn);
4492 }
4493
4494 /*
4495 * Return of 0 causes the TX thread to restart.
4496 */
4497 int iscsit_logout_post_handler(
4498 struct iscsi_cmd *cmd,
4499 struct iscsi_conn *conn)
4500 {
4501 int ret = 0;
4502
4503 switch (cmd->logout_reason) {
4504 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4505 switch (cmd->logout_response) {
4506 case ISCSI_LOGOUT_SUCCESS:
4507 case ISCSI_LOGOUT_CLEANUP_FAILED:
4508 default:
4509 iscsit_logout_post_handler_closesession(conn);
4510 break;
4511 }
4512 ret = 0;
4513 break;
4514 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4515 if (conn->cid == cmd->logout_cid) {
4516 switch (cmd->logout_response) {
4517 case ISCSI_LOGOUT_SUCCESS:
4518 case ISCSI_LOGOUT_CLEANUP_FAILED:
4519 default:
4520 iscsit_logout_post_handler_samecid(conn);
4521 break;
4522 }
4523 ret = 0;
4524 } else {
4525 switch (cmd->logout_response) {
4526 case ISCSI_LOGOUT_SUCCESS:
4527 iscsit_logout_post_handler_diffcid(conn,
4528 cmd->logout_cid);
4529 break;
4530 case ISCSI_LOGOUT_CID_NOT_FOUND:
4531 case ISCSI_LOGOUT_CLEANUP_FAILED:
4532 default:
4533 break;
4534 }
4535 ret = 1;
4536 }
4537 break;
4538 case ISCSI_LOGOUT_REASON_RECOVERY:
4539 switch (cmd->logout_response) {
4540 case ISCSI_LOGOUT_SUCCESS:
4541 case ISCSI_LOGOUT_CID_NOT_FOUND:
4542 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4543 case ISCSI_LOGOUT_CLEANUP_FAILED:
4544 default:
4545 break;
4546 }
4547 ret = 1;
4548 break;
4549 default:
4550 break;
4551
4552 }
4553 return ret;
4554 }
4555 EXPORT_SYMBOL(iscsit_logout_post_handler);
4556
4557 void iscsit_fail_session(struct iscsi_session *sess)
4558 {
4559 struct iscsi_conn *conn;
4560
4561 spin_lock_bh(&sess->conn_lock);
4562 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4563 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4564 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4565 }
4566 spin_unlock_bh(&sess->conn_lock);
4567
4568 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4569 sess->session_state = TARG_SESS_STATE_FAILED;
4570 }
4571
4572 int iscsit_free_session(struct iscsi_session *sess)
4573 {
4574 u16 conn_count = atomic_read(&sess->nconn);
4575 struct iscsi_conn *conn, *conn_tmp = NULL;
4576 int is_last;
4577
4578 spin_lock_bh(&sess->conn_lock);
4579 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4580
4581 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4582 conn_list) {
4583 if (conn_count == 0)
4584 break;
4585
4586 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4587 is_last = 1;
4588 } else {
4589 iscsit_inc_conn_usage_count(conn_tmp);
4590 is_last = 0;
4591 }
4592 iscsit_inc_conn_usage_count(conn);
4593
4594 spin_unlock_bh(&sess->conn_lock);
4595 iscsit_cause_connection_reinstatement(conn, 1);
4596 spin_lock_bh(&sess->conn_lock);
4597
4598 iscsit_dec_conn_usage_count(conn);
4599 if (is_last == 0)
4600 iscsit_dec_conn_usage_count(conn_tmp);
4601
4602 conn_count--;
4603 }
4604
4605 if (atomic_read(&sess->nconn)) {
4606 spin_unlock_bh(&sess->conn_lock);
4607 wait_for_completion(&sess->session_wait_comp);
4608 } else
4609 spin_unlock_bh(&sess->conn_lock);
4610
4611 iscsit_close_session(sess);
4612 return 0;
4613 }
4614
4615 void iscsit_stop_session(
4616 struct iscsi_session *sess,
4617 int session_sleep,
4618 int connection_sleep)
4619 {
4620 u16 conn_count = atomic_read(&sess->nconn);
4621 struct iscsi_conn *conn, *conn_tmp = NULL;
4622 int is_last;
4623
4624 spin_lock_bh(&sess->conn_lock);
4625 if (session_sleep)
4626 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4627
4628 if (connection_sleep) {
4629 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4630 conn_list) {
4631 if (conn_count == 0)
4632 break;
4633
4634 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4635 is_last = 1;
4636 } else {
4637 iscsit_inc_conn_usage_count(conn_tmp);
4638 is_last = 0;
4639 }
4640 iscsit_inc_conn_usage_count(conn);
4641
4642 spin_unlock_bh(&sess->conn_lock);
4643 iscsit_cause_connection_reinstatement(conn, 1);
4644 spin_lock_bh(&sess->conn_lock);
4645
4646 iscsit_dec_conn_usage_count(conn);
4647 if (is_last == 0)
4648 iscsit_dec_conn_usage_count(conn_tmp);
4649 conn_count--;
4650 }
4651 } else {
4652 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4653 iscsit_cause_connection_reinstatement(conn, 0);
4654 }
4655
4656 if (session_sleep && atomic_read(&sess->nconn)) {
4657 spin_unlock_bh(&sess->conn_lock);
4658 wait_for_completion(&sess->session_wait_comp);
4659 } else
4660 spin_unlock_bh(&sess->conn_lock);
4661 }
4662
4663 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4664 {
4665 struct iscsi_session *sess;
4666 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4667 struct se_session *se_sess, *se_sess_tmp;
4668 LIST_HEAD(free_list);
4669 int session_count = 0;
4670
4671 spin_lock_bh(&se_tpg->session_lock);
4672 if (tpg->nsessions && !force) {
4673 spin_unlock_bh(&se_tpg->session_lock);
4674 return -1;
4675 }
4676
4677 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4678 sess_list) {
4679 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4680
4681 spin_lock(&sess->conn_lock);
4682 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4683 atomic_read(&sess->session_logout) ||
4684 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4685 spin_unlock(&sess->conn_lock);
4686 continue;
4687 }
4688 atomic_set(&sess->session_reinstatement, 1);
4689 atomic_set(&sess->session_fall_back_to_erl0, 1);
4690 spin_unlock(&sess->conn_lock);
4691
4692 list_move_tail(&se_sess->sess_list, &free_list);
4693 }
4694 spin_unlock_bh(&se_tpg->session_lock);
4695
4696 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4697 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4698
4699 iscsit_free_session(sess);
4700 session_count++;
4701 }
4702
4703 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4704 " Group: %hu\n", session_count, tpg->tpgt);
4705 return 0;
4706 }
4707
4708 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4709 MODULE_VERSION("4.1.x");
4710 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4711 MODULE_LICENSE("GPL");
4712
4713 module_init(iscsi_target_init_module);
4714 module_exit(iscsi_target_cleanup_module);
Linux with added FPC-III support