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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / target / iscsi / iscsi_target.c
blobb94ed4e30770688891a407d1c9dba88d3110f3b8
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 if (target_get_sess_cmd(&cmd->se_cmd, true) < 0)
1169 return iscsit_add_reject_cmd(cmd,
1170 ISCSI_REASON_WAITING_FOR_LOGOUT, buf);
1171
1172 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1173 scsilun_to_int(&hdr->lun));
1174 if (cmd->sense_reason)
1175 goto attach_cmd;
1176
1177 /* only used for printks or comparing with ->ref_task_tag */
1178 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1179 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1180 if (cmd->sense_reason) {
1181 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1182 return iscsit_add_reject_cmd(cmd,
1183 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1184 }
1185
1186 goto attach_cmd;
1187 }
1188
1189 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1190 return iscsit_add_reject_cmd(cmd,
1191 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1192 }
1193
1194 attach_cmd:
1195 spin_lock_bh(&conn->cmd_lock);
1196 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1197 spin_unlock_bh(&conn->cmd_lock);
1198 /*
1199 * Check if we need to delay processing because of ALUA
1200 * Active/NonOptimized primary access state..
1201 */
1202 core_alua_check_nonop_delay(&cmd->se_cmd);
1203
1204 return 0;
1205 }
1206 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1207
1208 void iscsit_set_unsolicited_dataout(struct iscsi_cmd *cmd)
1209 {
1210 iscsit_set_dataout_sequence_values(cmd);
1211
1212 spin_lock_bh(&cmd->dataout_timeout_lock);
1213 iscsit_start_dataout_timer(cmd, cmd->conn);
1214 spin_unlock_bh(&cmd->dataout_timeout_lock);
1215 }
1216 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout);
1217
1218 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1219 struct iscsi_scsi_req *hdr)
1220 {
1221 int cmdsn_ret = 0;
1222 /*
1223 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1224 * the Immediate Bit is not set, and no Immediate
1225 * Data is attached.
1226 *
1227 * A PDU/CmdSN carrying Immediate Data can only
1228 * be processed after the DataCRC has passed.
1229 * If the DataCRC fails, the CmdSN MUST NOT
1230 * be acknowledged. (See below)
1231 */
1232 if (!cmd->immediate_data) {
1233 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1234 (unsigned char *)hdr, hdr->cmdsn);
1235 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1236 return -1;
1237 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1238 target_put_sess_cmd(&cmd->se_cmd);
1239 return 0;
1240 }
1241 }
1242
1243 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1244
1245 /*
1246 * If no Immediate Data is attached, it's OK to return now.
1247 */
1248 if (!cmd->immediate_data) {
1249 if (!cmd->sense_reason && cmd->unsolicited_data)
1250 iscsit_set_unsolicited_dataout(cmd);
1251 if (!cmd->sense_reason)
1252 return 0;
1253
1254 target_put_sess_cmd(&cmd->se_cmd);
1255 return 0;
1256 }
1257
1258 /*
1259 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1260 * execution. These exceptions are processed in CmdSN order using
1261 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1262 */
1263 if (cmd->sense_reason)
1264 return 1;
1265 /*
1266 * Call directly into transport_generic_new_cmd() to perform
1267 * the backend memory allocation.
1268 */
1269 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1270 if (cmd->sense_reason)
1271 return 1;
1272
1273 return 0;
1274 }
1275 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1276
1277 static int
1278 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1279 bool dump_payload)
1280 {
1281 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1282 int rc;
1283
1284 /*
1285 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1286 */
1287 if (dump_payload) {
1288 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done,
1289 cmd->first_burst_len);
1290
1291 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n",
1292 cmd->se_cmd.data_length, cmd->write_data_done,
1293 cmd->first_burst_len, length);
1294 rc = iscsit_dump_data_payload(cmd->conn, length, 1);
1295 pr_debug("Finished dumping immediate data\n");
1296 if (rc < 0)
1297 immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER;
1298 } else {
1299 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1300 cmd->first_burst_len);
1301 }
1302
1303 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1304 /*
1305 * A PDU/CmdSN carrying Immediate Data passed
1306 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1307 * Immediate Bit is not set.
1308 */
1309 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1310 (unsigned char *)hdr, hdr->cmdsn);
1311 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1312 return -1;
1313
1314 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1315 target_put_sess_cmd(&cmd->se_cmd);
1316
1317 return 0;
1318 } else if (cmd->unsolicited_data)
1319 iscsit_set_unsolicited_dataout(cmd);
1320
1321 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1322 /*
1323 * Immediate Data failed DataCRC and ERL>=1,
1324 * silently drop this PDU and let the initiator
1325 * plug the CmdSN gap.
1326 *
1327 * FIXME: Send Unsolicited NOPIN with reserved
1328 * TTT here to help the initiator figure out
1329 * the missing CmdSN, although they should be
1330 * intelligent enough to determine the missing
1331 * CmdSN and issue a retry to plug the sequence.
1332 */
1333 cmd->i_state = ISTATE_REMOVE;
1334 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1335 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1336 return -1;
1337
1338 return 0;
1339 }
1340
1341 static int
1342 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1343 unsigned char *buf)
1344 {
1345 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1346 int rc, immed_data;
1347 bool dump_payload = false;
1348
1349 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1350 if (rc < 0)
1351 return 0;
1352 /*
1353 * Allocation iovecs needed for struct socket operations for
1354 * traditional iSCSI block I/O.
1355 */
1356 if (iscsit_allocate_iovecs(cmd) < 0) {
1357 return iscsit_reject_cmd(cmd,
1358 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1359 }
1360 immed_data = cmd->immediate_data;
1361
1362 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1363 if (rc < 0)
1364 return rc;
1365 else if (rc > 0)
1366 dump_payload = true;
1367
1368 if (!immed_data)
1369 return 0;
1370
1371 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1372 }
1373
1374 static u32 iscsit_do_crypto_hash_sg(
1375 struct ahash_request *hash,
1376 struct iscsi_cmd *cmd,
1377 u32 data_offset,
1378 u32 data_length,
1379 u32 padding,
1380 u8 *pad_bytes)
1381 {
1382 u32 data_crc;
1383 struct scatterlist *sg;
1384 unsigned int page_off;
1385
1386 crypto_ahash_init(hash);
1387
1388 sg = cmd->first_data_sg;
1389 page_off = cmd->first_data_sg_off;
1390
1391 while (data_length) {
1392 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1393
1394 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1395 crypto_ahash_update(hash);
1396
1397 data_length -= cur_len;
1398 page_off = 0;
1399 /* iscsit_map_iovec has already checked for invalid sg pointers */
1400 sg = sg_next(sg);
1401 }
1402
1403 if (padding) {
1404 struct scatterlist pad_sg;
1405
1406 sg_init_one(&pad_sg, pad_bytes, padding);
1407 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1408 padding);
1409 crypto_ahash_finup(hash);
1410 } else {
1411 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1412 crypto_ahash_final(hash);
1413 }
1414
1415 return data_crc;
1416 }
1417
1418 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1419 const void *buf, u32 payload_length, u32 padding,
1420 const void *pad_bytes, void *data_crc)
1421 {
1422 struct scatterlist sg[2];
1423
1424 sg_init_table(sg, ARRAY_SIZE(sg));
1425 sg_set_buf(sg, buf, payload_length);
1426 if (padding)
1427 sg_set_buf(sg + 1, pad_bytes, padding);
1428
1429 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1430
1431 crypto_ahash_digest(hash);
1432 }
1433
1434 int
1435 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1436 struct iscsi_cmd *cmd, u32 payload_length,
1437 bool *success)
1438 {
1439 struct iscsi_data *hdr = buf;
1440 struct se_cmd *se_cmd;
1441 int rc;
1442
1443 /* iSCSI write */
1444 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1445
1446 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1447 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1448 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1449 payload_length, conn->cid);
1450
1451 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1452 pr_err("Command ITT: 0x%08x received DataOUT after"
1453 " last DataOUT received, dumping payload\n",
1454 cmd->init_task_tag);
1455 return iscsit_dump_data_payload(conn, payload_length, 1);
1456 }
1457
1458 if (cmd->data_direction != DMA_TO_DEVICE) {
1459 pr_err("Command ITT: 0x%08x received DataOUT for a"
1460 " NON-WRITE command.\n", cmd->init_task_tag);
1461 return iscsit_dump_data_payload(conn, payload_length, 1);
1462 }
1463 se_cmd = &cmd->se_cmd;
1464 iscsit_mod_dataout_timer(cmd);
1465
1466 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1467 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1468 be32_to_cpu(hdr->offset), payload_length,
1469 cmd->se_cmd.data_length);
1470 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1471 }
1472
1473 if (cmd->unsolicited_data) {
1474 int dump_unsolicited_data = 0;
1475
1476 if (conn->sess->sess_ops->InitialR2T) {
1477 pr_err("Received unexpected unsolicited data"
1478 " while InitialR2T=Yes, protocol error.\n");
1479 transport_send_check_condition_and_sense(&cmd->se_cmd,
1480 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1481 return -1;
1482 }
1483 /*
1484 * Special case for dealing with Unsolicited DataOUT
1485 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1486 * failures;
1487 */
1488
1489 /* Something's amiss if we're not in WRITE_PENDING state... */
1490 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1491 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1492 dump_unsolicited_data = 1;
1493
1494 if (dump_unsolicited_data) {
1495 /*
1496 * Check if a delayed TASK_ABORTED status needs to
1497 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1498 * received with the unsolicited data out.
1499 */
1500 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1501 iscsit_stop_dataout_timer(cmd);
1502
1503 return iscsit_dump_data_payload(conn, payload_length, 1);
1504 }
1505 } else {
1506 /*
1507 * For the normal solicited data path:
1508 *
1509 * Check for a delayed TASK_ABORTED status and dump any
1510 * incoming data out payload if one exists. Also, when the
1511 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1512 * data out sequence, we decrement outstanding_r2ts. Once
1513 * outstanding_r2ts reaches zero, go ahead and send the delayed
1514 * TASK_ABORTED status.
1515 */
1516 if (se_cmd->transport_state & CMD_T_ABORTED) {
1517 if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1518 --cmd->outstanding_r2ts < 1)
1519 iscsit_stop_dataout_timer(cmd);
1520
1521 return iscsit_dump_data_payload(conn, payload_length, 1);
1522 }
1523 }
1524 /*
1525 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1526 * within-command recovery checks before receiving the payload.
1527 */
1528 rc = iscsit_check_pre_dataout(cmd, buf);
1529 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1530 return 0;
1531 else if (rc == DATAOUT_CANNOT_RECOVER)
1532 return -1;
1533 *success = true;
1534 return 0;
1535 }
1536 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1537
1538 int
1539 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1540 struct iscsi_cmd **out_cmd)
1541 {
1542 struct iscsi_data *hdr = buf;
1543 struct iscsi_cmd *cmd;
1544 u32 payload_length = ntoh24(hdr->dlength);
1545 int rc;
1546 bool success = false;
1547
1548 if (!payload_length) {
1549 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1550 return 0;
1551 }
1552
1553 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1554 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1555 " MaxXmitDataSegmentLength: %u\n", payload_length,
1556 conn->conn_ops->MaxXmitDataSegmentLength);
1557 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1558 }
1559
1560 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1561 if (!cmd)
1562 return 0;
1563
1564 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1565
1566 if (success)
1567 *out_cmd = cmd;
1568
1569 return rc;
1570 }
1571 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1572
1573 static int
1574 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1575 struct iscsi_data *hdr)
1576 {
1577 struct kvec *iov;
1578 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1579 u32 payload_length;
1580 int iov_ret, data_crc_failed = 0;
1581
1582 payload_length = min_t(u32, cmd->se_cmd.data_length,
1583 ntoh24(hdr->dlength));
1584 rx_size += payload_length;
1585 iov = &cmd->iov_data[0];
1586
1587 iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2,
1588 be32_to_cpu(hdr->offset), payload_length);
1589 if (iov_ret < 0)
1590 return -1;
1591
1592 iov_count += iov_ret;
1593
1594 padding = ((-payload_length) & 3);
1595 if (padding != 0) {
1596 iov[iov_count].iov_base = cmd->pad_bytes;
1597 iov[iov_count++].iov_len = padding;
1598 rx_size += padding;
1599 pr_debug("Receiving %u padding bytes.\n", padding);
1600 }
1601
1602 if (conn->conn_ops->DataDigest) {
1603 iov[iov_count].iov_base = &checksum;
1604 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1605 rx_size += ISCSI_CRC_LEN;
1606 }
1607
1608 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
1609 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1610
1611 iscsit_unmap_iovec(cmd);
1612
1613 if (rx_got != rx_size)
1614 return -1;
1615
1616 if (conn->conn_ops->DataDigest) {
1617 u32 data_crc;
1618
1619 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1620 be32_to_cpu(hdr->offset),
1621 payload_length, padding,
1622 cmd->pad_bytes);
1623
1624 if (checksum != data_crc) {
1625 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1626 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1627 " does not match computed 0x%08x\n",
1628 hdr->itt, hdr->offset, payload_length,
1629 hdr->datasn, checksum, data_crc);
1630 data_crc_failed = 1;
1631 } else {
1632 pr_debug("Got CRC32C DataDigest 0x%08x for"
1633 " %u bytes of Data Out\n", checksum,
1634 payload_length);
1635 }
1636 }
1637
1638 return data_crc_failed;
1639 }
1640
1641 int
1642 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1643 bool data_crc_failed)
1644 {
1645 struct iscsi_conn *conn = cmd->conn;
1646 int rc, ooo_cmdsn;
1647 /*
1648 * Increment post receive data and CRC values or perform
1649 * within-command recovery.
1650 */
1651 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1652 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1653 return 0;
1654 else if (rc == DATAOUT_SEND_R2T) {
1655 iscsit_set_dataout_sequence_values(cmd);
1656 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1657 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1658 /*
1659 * Handle extra special case for out of order
1660 * Unsolicited Data Out.
1661 */
1662 spin_lock_bh(&cmd->istate_lock);
1663 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1664 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1665 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1666 spin_unlock_bh(&cmd->istate_lock);
1667
1668 iscsit_stop_dataout_timer(cmd);
1669 if (ooo_cmdsn)
1670 return 0;
1671 target_execute_cmd(&cmd->se_cmd);
1672 return 0;
1673 } else /* DATAOUT_CANNOT_RECOVER */
1674 return -1;
1675
1676 return 0;
1677 }
1678 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1679
1680 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1681 {
1682 struct iscsi_cmd *cmd = NULL;
1683 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1684 int rc;
1685 bool data_crc_failed = false;
1686
1687 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1688 if (rc < 0)
1689 return 0;
1690 else if (!cmd)
1691 return 0;
1692
1693 rc = iscsit_get_dataout(conn, cmd, hdr);
1694 if (rc < 0)
1695 return rc;
1696 else if (rc > 0)
1697 data_crc_failed = true;
1698
1699 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1700 }
1701
1702 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1703 struct iscsi_nopout *hdr)
1704 {
1705 u32 payload_length = ntoh24(hdr->dlength);
1706
1707 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1708 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1709 if (!cmd)
1710 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1711 (unsigned char *)hdr);
1712
1713 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1714 (unsigned char *)hdr);
1715 }
1716
1717 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1718 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1719 " not set, protocol error.\n");
1720 if (!cmd)
1721 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1722 (unsigned char *)hdr);
1723
1724 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1725 (unsigned char *)hdr);
1726 }
1727
1728 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1729 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1730 " greater than MaxXmitDataSegmentLength: %u, protocol"
1731 " error.\n", payload_length,
1732 conn->conn_ops->MaxXmitDataSegmentLength);
1733 if (!cmd)
1734 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1735 (unsigned char *)hdr);
1736
1737 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1738 (unsigned char *)hdr);
1739 }
1740
1741 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1742 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1743 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1744 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1745 payload_length);
1746 /*
1747 * This is not a response to a Unsolicited NopIN, which means
1748 * it can either be a NOPOUT ping request (with a valid ITT),
1749 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1750 * Either way, make sure we allocate an struct iscsi_cmd, as both
1751 * can contain ping data.
1752 */
1753 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1754 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1755 cmd->i_state = ISTATE_SEND_NOPIN;
1756 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1757 1 : 0);
1758 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1759 cmd->targ_xfer_tag = 0xFFFFFFFF;
1760 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1761 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1762 cmd->data_direction = DMA_NONE;
1763 }
1764
1765 return 0;
1766 }
1767 EXPORT_SYMBOL(iscsit_setup_nop_out);
1768
1769 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1770 struct iscsi_nopout *hdr)
1771 {
1772 struct iscsi_cmd *cmd_p = NULL;
1773 int cmdsn_ret = 0;
1774 /*
1775 * Initiator is expecting a NopIN ping reply..
1776 */
1777 if (hdr->itt != RESERVED_ITT) {
1778 if (!cmd)
1779 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1780 (unsigned char *)hdr);
1781
1782 spin_lock_bh(&conn->cmd_lock);
1783 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1784 spin_unlock_bh(&conn->cmd_lock);
1785
1786 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1787
1788 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1789 iscsit_add_cmd_to_response_queue(cmd, conn,
1790 cmd->i_state);
1791 return 0;
1792 }
1793
1794 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1795 (unsigned char *)hdr, hdr->cmdsn);
1796 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1797 return 0;
1798 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1799 return -1;
1800
1801 return 0;
1802 }
1803 /*
1804 * This was a response to a unsolicited NOPIN ping.
1805 */
1806 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1807 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1808 if (!cmd_p)
1809 return -EINVAL;
1810
1811 iscsit_stop_nopin_response_timer(conn);
1812
1813 cmd_p->i_state = ISTATE_REMOVE;
1814 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1815
1816 iscsit_start_nopin_timer(conn);
1817 return 0;
1818 }
1819 /*
1820 * Otherwise, initiator is not expecting a NOPIN is response.
1821 * Just ignore for now.
1822 */
1823
1824 if (cmd)
1825 iscsit_free_cmd(cmd, false);
1826
1827 return 0;
1828 }
1829 EXPORT_SYMBOL(iscsit_process_nop_out);
1830
1831 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1832 unsigned char *buf)
1833 {
1834 unsigned char *ping_data = NULL;
1835 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1836 struct kvec *iov = NULL;
1837 u32 payload_length = ntoh24(hdr->dlength);
1838 int ret;
1839
1840 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1841 if (ret < 0)
1842 return 0;
1843 /*
1844 * Handle NOP-OUT payload for traditional iSCSI sockets
1845 */
1846 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1847 u32 checksum, data_crc, padding = 0;
1848 int niov = 0, rx_got, rx_size = payload_length;
1849
1850 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1851 if (!ping_data) {
1852 ret = -1;
1853 goto out;
1854 }
1855
1856 iov = &cmd->iov_misc[0];
1857 iov[niov].iov_base = ping_data;
1858 iov[niov++].iov_len = payload_length;
1859
1860 padding = ((-payload_length) & 3);
1861 if (padding != 0) {
1862 pr_debug("Receiving %u additional bytes"
1863 " for padding.\n", padding);
1864 iov[niov].iov_base = &cmd->pad_bytes;
1865 iov[niov++].iov_len = padding;
1866 rx_size += padding;
1867 }
1868 if (conn->conn_ops->DataDigest) {
1869 iov[niov].iov_base = &checksum;
1870 iov[niov++].iov_len = ISCSI_CRC_LEN;
1871 rx_size += ISCSI_CRC_LEN;
1872 }
1873
1874 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc));
1875 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1876 if (rx_got != rx_size) {
1877 ret = -1;
1878 goto out;
1879 }
1880
1881 if (conn->conn_ops->DataDigest) {
1882 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1883 payload_length, padding,
1884 cmd->pad_bytes, &data_crc);
1885
1886 if (checksum != data_crc) {
1887 pr_err("Ping data CRC32C DataDigest"
1888 " 0x%08x does not match computed 0x%08x\n",
1889 checksum, data_crc);
1890 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1891 pr_err("Unable to recover from"
1892 " NOPOUT Ping DataCRC failure while in"
1893 " ERL=0.\n");
1894 ret = -1;
1895 goto out;
1896 } else {
1897 /*
1898 * Silently drop this PDU and let the
1899 * initiator plug the CmdSN gap.
1900 */
1901 pr_debug("Dropping NOPOUT"
1902 " Command CmdSN: 0x%08x due to"
1903 " DataCRC error.\n", hdr->cmdsn);
1904 ret = 0;
1905 goto out;
1906 }
1907 } else {
1908 pr_debug("Got CRC32C DataDigest"
1909 " 0x%08x for %u bytes of ping data.\n",
1910 checksum, payload_length);
1911 }
1912 }
1913
1914 ping_data[payload_length] = '\0';
1915 /*
1916 * Attach ping data to struct iscsi_cmd->buf_ptr.
1917 */
1918 cmd->buf_ptr = ping_data;
1919 cmd->buf_ptr_size = payload_length;
1920
1921 pr_debug("Got %u bytes of NOPOUT ping"
1922 " data.\n", payload_length);
1923 pr_debug("Ping Data: \"%s\"\n", ping_data);
1924 }
1925
1926 return iscsit_process_nop_out(conn, cmd, hdr);
1927 out:
1928 if (cmd)
1929 iscsit_free_cmd(cmd, false);
1930
1931 kfree(ping_data);
1932 return ret;
1933 }
1934
1935 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1936 {
1937 switch (iscsi_tmf) {
1938 case ISCSI_TM_FUNC_ABORT_TASK:
1939 return TMR_ABORT_TASK;
1940 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1941 return TMR_ABORT_TASK_SET;
1942 case ISCSI_TM_FUNC_CLEAR_ACA:
1943 return TMR_CLEAR_ACA;
1944 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1945 return TMR_CLEAR_TASK_SET;
1946 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1947 return TMR_LUN_RESET;
1948 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1949 return TMR_TARGET_WARM_RESET;
1950 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1951 return TMR_TARGET_COLD_RESET;
1952 default:
1953 return TMR_UNKNOWN;
1954 }
1955 }
1956
1957 int
1958 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1959 unsigned char *buf)
1960 {
1961 struct se_tmr_req *se_tmr;
1962 struct iscsi_tmr_req *tmr_req;
1963 struct iscsi_tm *hdr;
1964 int out_of_order_cmdsn = 0, ret;
1965 u8 function, tcm_function = TMR_UNKNOWN;
1966
1967 hdr = (struct iscsi_tm *) buf;
1968 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1969 function = hdr->flags;
1970
1971 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1972 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1973 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1974 hdr->rtt, hdr->refcmdsn, conn->cid);
1975
1976 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1977 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1978 hdr->rtt != RESERVED_ITT)) {
1979 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1980 hdr->rtt = RESERVED_ITT;
1981 }
1982
1983 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1984 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1985 pr_err("Task Management Request TASK_REASSIGN not"
1986 " issued as immediate command, bad iSCSI Initiator"
1987 "implementation\n");
1988 return iscsit_add_reject_cmd(cmd,
1989 ISCSI_REASON_PROTOCOL_ERROR, buf);
1990 }
1991 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1992 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1993 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1994
1995 cmd->data_direction = DMA_NONE;
1996 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1997 if (!cmd->tmr_req) {
1998 return iscsit_add_reject_cmd(cmd,
1999 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2000 buf);
2001 }
2002
2003 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2004 conn->sess->se_sess, 0, DMA_NONE,
2005 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2006
2007 if (target_get_sess_cmd(&cmd->se_cmd, true) < 0)
2008 return iscsit_add_reject_cmd(cmd,
2009 ISCSI_REASON_WAITING_FOR_LOGOUT, buf);
2010
2011 /*
2012 * TASK_REASSIGN for ERL=2 / connection stays inside of
2013 * LIO-Target $FABRIC_MOD
2014 */
2015 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2016 tcm_function = iscsit_convert_tmf(function);
2017 if (tcm_function == TMR_UNKNOWN) {
2018 pr_err("Unknown iSCSI TMR Function:"
2019 " 0x%02x\n", function);
2020 return iscsit_add_reject_cmd(cmd,
2021 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2022 }
2023 }
2024 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2025 GFP_KERNEL);
2026 if (ret < 0)
2027 return iscsit_add_reject_cmd(cmd,
2028 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2029
2030 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2031
2032 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2033 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2034 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2035 cmd->init_task_tag = hdr->itt;
2036 cmd->targ_xfer_tag = 0xFFFFFFFF;
2037 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2038 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2039 se_tmr = cmd->se_cmd.se_tmr_req;
2040 tmr_req = cmd->tmr_req;
2041 /*
2042 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2043 */
2044 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2045 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2046 scsilun_to_int(&hdr->lun));
2047 if (ret < 0) {
2048 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2049 goto attach;
2050 }
2051 }
2052
2053 switch (function) {
2054 case ISCSI_TM_FUNC_ABORT_TASK:
2055 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2056 if (se_tmr->response)
2057 goto attach;
2058 break;
2059 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2060 case ISCSI_TM_FUNC_CLEAR_ACA:
2061 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2062 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2063 break;
2064 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2065 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2066 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2067 goto attach;
2068 }
2069 break;
2070 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2071 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2072 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2073 goto attach;
2074 }
2075 break;
2076 case ISCSI_TM_FUNC_TASK_REASSIGN:
2077 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2078 /*
2079 * Perform sanity checks on the ExpDataSN only if the
2080 * TASK_REASSIGN was successful.
2081 */
2082 if (se_tmr->response)
2083 break;
2084
2085 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2086 return iscsit_add_reject_cmd(cmd,
2087 ISCSI_REASON_BOOKMARK_INVALID, buf);
2088 break;
2089 default:
2090 pr_err("Unknown TMR function: 0x%02x, protocol"
2091 " error.\n", function);
2092 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2093 goto attach;
2094 }
2095
2096 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2097 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2098 se_tmr->call_transport = 1;
2099 attach:
2100 spin_lock_bh(&conn->cmd_lock);
2101 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2102 spin_unlock_bh(&conn->cmd_lock);
2103
2104 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2105 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2106 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2107 out_of_order_cmdsn = 1;
2108 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2109 target_put_sess_cmd(&cmd->se_cmd);
2110 return 0;
2111 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2112 return -1;
2113 }
2114 }
2115 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2116
2117 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2118 return 0;
2119 /*
2120 * Found the referenced task, send to transport for processing.
2121 */
2122 if (se_tmr->call_transport)
2123 return transport_generic_handle_tmr(&cmd->se_cmd);
2124
2125 /*
2126 * Could not find the referenced LUN, task, or Task Management
2127 * command not authorized or supported. Change state and
2128 * let the tx_thread send the response.
2129 *
2130 * For connection recovery, this is also the default action for
2131 * TMR TASK_REASSIGN.
2132 */
2133 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2134 target_put_sess_cmd(&cmd->se_cmd);
2135 return 0;
2136 }
2137 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2138
2139 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2140 int
2141 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2142 struct iscsi_text *hdr)
2143 {
2144 u32 payload_length = ntoh24(hdr->dlength);
2145
2146 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2147 pr_err("Unable to accept text parameter length: %u"
2148 "greater than MaxXmitDataSegmentLength %u.\n",
2149 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2150 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2151 (unsigned char *)hdr);
2152 }
2153
2154 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2155 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2156 pr_err("Multi sequence text commands currently not supported\n");
2157 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2158 (unsigned char *)hdr);
2159 }
2160
2161 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2162 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2163 hdr->exp_statsn, payload_length);
2164
2165 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2166 cmd->i_state = ISTATE_SEND_TEXTRSP;
2167 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2168 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2169 cmd->targ_xfer_tag = 0xFFFFFFFF;
2170 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2171 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2172 cmd->data_direction = DMA_NONE;
2173 kfree(cmd->text_in_ptr);
2174 cmd->text_in_ptr = NULL;
2175
2176 return 0;
2177 }
2178 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2179
2180 int
2181 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2182 struct iscsi_text *hdr)
2183 {
2184 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2185 int cmdsn_ret;
2186
2187 if (!text_in) {
2188 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2189 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2190 pr_err("Unable to locate text_in buffer for sendtargets"
2191 " discovery\n");
2192 goto reject;
2193 }
2194 goto empty_sendtargets;
2195 }
2196 if (strncmp("SendTargets=", text_in, 12) != 0) {
2197 pr_err("Received Text Data that is not"
2198 " SendTargets, cannot continue.\n");
2199 goto reject;
2200 }
2201 /* '=' confirmed in strncmp */
2202 text_ptr = strchr(text_in, '=');
2203 BUG_ON(!text_ptr);
2204 if (!strncmp("=All", text_ptr, 5)) {
2205 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2206 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2207 !strncmp("=eui.", text_ptr, 5)) {
2208 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2209 } else {
2210 pr_err("Unable to locate valid SendTargets%s value\n",
2211 text_ptr);
2212 goto reject;
2213 }
2214
2215 spin_lock_bh(&conn->cmd_lock);
2216 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2217 spin_unlock_bh(&conn->cmd_lock);
2218
2219 empty_sendtargets:
2220 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2221
2222 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2223 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2224 (unsigned char *)hdr, hdr->cmdsn);
2225 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2226 return -1;
2227
2228 return 0;
2229 }
2230
2231 return iscsit_execute_cmd(cmd, 0);
2232
2233 reject:
2234 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2235 (unsigned char *)hdr);
2236 }
2237 EXPORT_SYMBOL(iscsit_process_text_cmd);
2238
2239 static int
2240 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2241 unsigned char *buf)
2242 {
2243 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2244 char *text_in = NULL;
2245 u32 payload_length = ntoh24(hdr->dlength);
2246 int rx_size, rc;
2247
2248 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2249 if (rc < 0)
2250 return 0;
2251
2252 rx_size = payload_length;
2253 if (payload_length) {
2254 u32 checksum = 0, data_crc = 0;
2255 u32 padding = 0;
2256 int niov = 0, rx_got;
2257 struct kvec iov[2];
2258
2259 rx_size = ALIGN(payload_length, 4);
2260 text_in = kzalloc(rx_size, GFP_KERNEL);
2261 if (!text_in)
2262 goto reject;
2263
2264 cmd->text_in_ptr = text_in;
2265
2266 memset(iov, 0, sizeof(iov));
2267 iov[niov].iov_base = text_in;
2268 iov[niov++].iov_len = rx_size;
2269
2270 padding = rx_size - payload_length;
2271 if (padding)
2272 pr_debug("Receiving %u additional bytes"
2273 " for padding.\n", padding);
2274 if (conn->conn_ops->DataDigest) {
2275 iov[niov].iov_base = &checksum;
2276 iov[niov++].iov_len = ISCSI_CRC_LEN;
2277 rx_size += ISCSI_CRC_LEN;
2278 }
2279
2280 WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
2281 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2282 if (rx_got != rx_size)
2283 goto reject;
2284
2285 if (conn->conn_ops->DataDigest) {
2286 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2287 text_in, rx_size, 0, NULL,
2288 &data_crc);
2289
2290 if (checksum != data_crc) {
2291 pr_err("Text data CRC32C DataDigest"
2292 " 0x%08x does not match computed"
2293 " 0x%08x\n", checksum, data_crc);
2294 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2295 pr_err("Unable to recover from"
2296 " Text Data digest failure while in"
2297 " ERL=0.\n");
2298 goto reject;
2299 } else {
2300 /*
2301 * Silently drop this PDU and let the
2302 * initiator plug the CmdSN gap.
2303 */
2304 pr_debug("Dropping Text"
2305 " Command CmdSN: 0x%08x due to"
2306 " DataCRC error.\n", hdr->cmdsn);
2307 kfree(text_in);
2308 return 0;
2309 }
2310 } else {
2311 pr_debug("Got CRC32C DataDigest"
2312 " 0x%08x for %u bytes of text data.\n",
2313 checksum, payload_length);
2314 }
2315 }
2316 text_in[payload_length - 1] = '\0';
2317 pr_debug("Successfully read %d bytes of text"
2318 " data.\n", payload_length);
2319 }
2320
2321 return iscsit_process_text_cmd(conn, cmd, hdr);
2322
2323 reject:
2324 kfree(cmd->text_in_ptr);
2325 cmd->text_in_ptr = NULL;
2326 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2327 }
2328
2329 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2330 {
2331 struct iscsi_conn *conn_p;
2332 struct iscsi_session *sess = conn->sess;
2333
2334 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2335 " for SID: %u.\n", conn->cid, conn->sess->sid);
2336
2337 atomic_set(&sess->session_logout, 1);
2338 atomic_set(&conn->conn_logout_remove, 1);
2339 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2340
2341 iscsit_inc_conn_usage_count(conn);
2342 iscsit_inc_session_usage_count(sess);
2343
2344 spin_lock_bh(&sess->conn_lock);
2345 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2346 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2347 continue;
2348
2349 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2350 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2351 }
2352 spin_unlock_bh(&sess->conn_lock);
2353
2354 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2355
2356 return 0;
2357 }
2358
2359 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2360 {
2361 struct iscsi_conn *l_conn;
2362 struct iscsi_session *sess = conn->sess;
2363
2364 pr_debug("Received logout request CLOSECONNECTION for CID:"
2365 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2366
2367 /*
2368 * A Logout Request with a CLOSECONNECTION reason code for a CID
2369 * can arrive on a connection with a differing CID.
2370 */
2371 if (conn->cid == cmd->logout_cid) {
2372 spin_lock_bh(&conn->state_lock);
2373 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2374 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2375
2376 atomic_set(&conn->conn_logout_remove, 1);
2377 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2378 iscsit_inc_conn_usage_count(conn);
2379
2380 spin_unlock_bh(&conn->state_lock);
2381 } else {
2382 /*
2383 * Handle all different cid CLOSECONNECTION requests in
2384 * iscsit_logout_post_handler_diffcid() as to give enough
2385 * time for any non immediate command's CmdSN to be
2386 * acknowledged on the connection in question.
2387 *
2388 * Here we simply make sure the CID is still around.
2389 */
2390 l_conn = iscsit_get_conn_from_cid(sess,
2391 cmd->logout_cid);
2392 if (!l_conn) {
2393 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2394 iscsit_add_cmd_to_response_queue(cmd, conn,
2395 cmd->i_state);
2396 return 0;
2397 }
2398
2399 iscsit_dec_conn_usage_count(l_conn);
2400 }
2401
2402 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2403
2404 return 0;
2405 }
2406
2407 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2408 {
2409 struct iscsi_session *sess = conn->sess;
2410
2411 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2412 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2413
2414 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2415 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2416 " while ERL!=2.\n");
2417 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2418 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2419 return 0;
2420 }
2421
2422 if (conn->cid == cmd->logout_cid) {
2423 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2424 " with CID: %hu on CID: %hu, implementation error.\n",
2425 cmd->logout_cid, conn->cid);
2426 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2427 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2428 return 0;
2429 }
2430
2431 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2432
2433 return 0;
2434 }
2435
2436 int
2437 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2438 unsigned char *buf)
2439 {
2440 int cmdsn_ret, logout_remove = 0;
2441 u8 reason_code = 0;
2442 struct iscsi_logout *hdr;
2443 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2444
2445 hdr = (struct iscsi_logout *) buf;
2446 reason_code = (hdr->flags & 0x7f);
2447
2448 if (tiqn) {
2449 spin_lock(&tiqn->logout_stats.lock);
2450 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2451 tiqn->logout_stats.normal_logouts++;
2452 else
2453 tiqn->logout_stats.abnormal_logouts++;
2454 spin_unlock(&tiqn->logout_stats.lock);
2455 }
2456
2457 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2458 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2459 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2460 hdr->cid, conn->cid);
2461
2462 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2463 pr_err("Received logout request on connection that"
2464 " is not in logged in state, ignoring request.\n");
2465 iscsit_free_cmd(cmd, false);
2466 return 0;
2467 }
2468
2469 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2470 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2471 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2472 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2473 cmd->targ_xfer_tag = 0xFFFFFFFF;
2474 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2475 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2476 cmd->logout_cid = be16_to_cpu(hdr->cid);
2477 cmd->logout_reason = reason_code;
2478 cmd->data_direction = DMA_NONE;
2479
2480 /*
2481 * We need to sleep in these cases (by returning 1) until the Logout
2482 * Response gets sent in the tx thread.
2483 */
2484 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2485 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2486 be16_to_cpu(hdr->cid) == conn->cid))
2487 logout_remove = 1;
2488
2489 spin_lock_bh(&conn->cmd_lock);
2490 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2491 spin_unlock_bh(&conn->cmd_lock);
2492
2493 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2494 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2495
2496 /*
2497 * Immediate commands are executed, well, immediately.
2498 * Non-Immediate Logout Commands are executed in CmdSN order.
2499 */
2500 if (cmd->immediate_cmd) {
2501 int ret = iscsit_execute_cmd(cmd, 0);
2502
2503 if (ret < 0)
2504 return ret;
2505 } else {
2506 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2507 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2508 logout_remove = 0;
2509 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2510 return -1;
2511 }
2512
2513 return logout_remove;
2514 }
2515 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2516
2517 int iscsit_handle_snack(
2518 struct iscsi_conn *conn,
2519 unsigned char *buf)
2520 {
2521 struct iscsi_snack *hdr;
2522
2523 hdr = (struct iscsi_snack *) buf;
2524 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2525
2526 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2527 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2528 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2529 hdr->begrun, hdr->runlength, conn->cid);
2530
2531 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2532 pr_err("Initiator sent SNACK request while in"
2533 " ErrorRecoveryLevel=0.\n");
2534 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2535 buf);
2536 }
2537 /*
2538 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2539 * call from inside iscsi_send_recovery_datain_or_r2t().
2540 */
2541 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2542 case 0:
2543 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2544 hdr->itt,
2545 be32_to_cpu(hdr->ttt),
2546 be32_to_cpu(hdr->begrun),
2547 be32_to_cpu(hdr->runlength));
2548 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2549 return iscsit_handle_status_snack(conn, hdr->itt,
2550 be32_to_cpu(hdr->ttt),
2551 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2552 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2553 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2554 be32_to_cpu(hdr->begrun),
2555 be32_to_cpu(hdr->runlength));
2556 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2557 /* FIXME: Support R-Data SNACK */
2558 pr_err("R-Data SNACK Not Supported.\n");
2559 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2560 buf);
2561 default:
2562 pr_err("Unknown SNACK type 0x%02x, protocol"
2563 " error.\n", hdr->flags & 0x0f);
2564 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2565 buf);
2566 }
2567
2568 return 0;
2569 }
2570 EXPORT_SYMBOL(iscsit_handle_snack);
2571
2572 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2573 {
2574 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2575 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2576 wait_for_completion_interruptible_timeout(
2577 &conn->rx_half_close_comp,
2578 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2579 }
2580 }
2581
2582 static int iscsit_handle_immediate_data(
2583 struct iscsi_cmd *cmd,
2584 struct iscsi_scsi_req *hdr,
2585 u32 length)
2586 {
2587 int iov_ret, rx_got = 0, rx_size = 0;
2588 u32 checksum, iov_count = 0, padding = 0;
2589 struct iscsi_conn *conn = cmd->conn;
2590 struct kvec *iov;
2591 void *overflow_buf = NULL;
2592
2593 BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
2594 rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
2595 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
2596 cmd->orig_iov_data_count - 2,
2597 cmd->write_data_done, rx_size);
2598 if (iov_ret < 0)
2599 return IMMEDIATE_DATA_CANNOT_RECOVER;
2600
2601 iov_count = iov_ret;
2602 iov = &cmd->iov_data[0];
2603 if (rx_size < length) {
2604 /*
2605 * Special case: length of immediate data exceeds the data
2606 * buffer size derived from the CDB.
2607 */
2608 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
2609 if (!overflow_buf) {
2610 iscsit_unmap_iovec(cmd);
2611 return IMMEDIATE_DATA_CANNOT_RECOVER;
2612 }
2613 cmd->overflow_buf = overflow_buf;
2614 iov[iov_count].iov_base = overflow_buf;
2615 iov[iov_count].iov_len = length - rx_size;
2616 iov_count++;
2617 rx_size = length;
2618 }
2619
2620 padding = ((-length) & 3);
2621 if (padding != 0) {
2622 iov[iov_count].iov_base = cmd->pad_bytes;
2623 iov[iov_count++].iov_len = padding;
2624 rx_size += padding;
2625 }
2626
2627 if (conn->conn_ops->DataDigest) {
2628 iov[iov_count].iov_base = &checksum;
2629 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2630 rx_size += ISCSI_CRC_LEN;
2631 }
2632
2633 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
2634 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2635
2636 iscsit_unmap_iovec(cmd);
2637
2638 if (rx_got != rx_size) {
2639 iscsit_rx_thread_wait_for_tcp(conn);
2640 return IMMEDIATE_DATA_CANNOT_RECOVER;
2641 }
2642
2643 if (conn->conn_ops->DataDigest) {
2644 u32 data_crc;
2645
2646 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2647 cmd->write_data_done, length, padding,
2648 cmd->pad_bytes);
2649
2650 if (checksum != data_crc) {
2651 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2652 " does not match computed 0x%08x\n", checksum,
2653 data_crc);
2654
2655 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2656 pr_err("Unable to recover from"
2657 " Immediate Data digest failure while"
2658 " in ERL=0.\n");
2659 iscsit_reject_cmd(cmd,
2660 ISCSI_REASON_DATA_DIGEST_ERROR,
2661 (unsigned char *)hdr);
2662 return IMMEDIATE_DATA_CANNOT_RECOVER;
2663 } else {
2664 iscsit_reject_cmd(cmd,
2665 ISCSI_REASON_DATA_DIGEST_ERROR,
2666 (unsigned char *)hdr);
2667 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2668 }
2669 } else {
2670 pr_debug("Got CRC32C DataDigest 0x%08x for"
2671 " %u bytes of Immediate Data\n", checksum,
2672 length);
2673 }
2674 }
2675
2676 cmd->write_data_done += length;
2677
2678 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2679 spin_lock_bh(&cmd->istate_lock);
2680 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2681 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2682 spin_unlock_bh(&cmd->istate_lock);
2683 }
2684
2685 return IMMEDIATE_DATA_NORMAL_OPERATION;
2686 }
2687
2688 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2689 with active network interface */
2690 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2691 {
2692 struct iscsi_cmd *cmd;
2693 struct iscsi_conn *conn_p;
2694 bool found = false;
2695
2696 lockdep_assert_held(&conn->sess->conn_lock);
2697
2698 /*
2699 * Only send a Asynchronous Message on connections whos network
2700 * interface is still functional.
2701 */
2702 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2703 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2704 iscsit_inc_conn_usage_count(conn_p);
2705 found = true;
2706 break;
2707 }
2708 }
2709
2710 if (!found)
2711 return;
2712
2713 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2714 if (!cmd) {
2715 iscsit_dec_conn_usage_count(conn_p);
2716 return;
2717 }
2718
2719 cmd->logout_cid = conn->cid;
2720 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2721 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2722
2723 spin_lock_bh(&conn_p->cmd_lock);
2724 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2725 spin_unlock_bh(&conn_p->cmd_lock);
2726
2727 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2728 iscsit_dec_conn_usage_count(conn_p);
2729 }
2730
2731 static int iscsit_send_conn_drop_async_message(
2732 struct iscsi_cmd *cmd,
2733 struct iscsi_conn *conn)
2734 {
2735 struct iscsi_async *hdr;
2736
2737 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2738
2739 hdr = (struct iscsi_async *) cmd->pdu;
2740 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2741 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2742 cmd->init_task_tag = RESERVED_ITT;
2743 cmd->targ_xfer_tag = 0xFFFFFFFF;
2744 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2745 cmd->stat_sn = conn->stat_sn++;
2746 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2747 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2748 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2749 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2750 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2751 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2752 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2753
2754 pr_debug("Sending Connection Dropped Async Message StatSN:"
2755 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2756 cmd->logout_cid, conn->cid);
2757
2758 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2759 }
2760
2761 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2762 {
2763 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2764 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2765 wait_for_completion_interruptible_timeout(
2766 &conn->tx_half_close_comp,
2767 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2768 }
2769 }
2770
2771 void
2772 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2773 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2774 bool set_statsn)
2775 {
2776 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2777 hdr->flags = datain->flags;
2778 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2779 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2780 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2781 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2782 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2783 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2784 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2785 }
2786 }
2787 hton24(hdr->dlength, datain->length);
2788 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2789 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2790 (struct scsi_lun *)&hdr->lun);
2791 else
2792 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2793
2794 hdr->itt = cmd->init_task_tag;
2795
2796 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2797 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2798 else
2799 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2800 if (set_statsn)
2801 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2802 else
2803 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2804
2805 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2806 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2807 hdr->datasn = cpu_to_be32(datain->data_sn);
2808 hdr->offset = cpu_to_be32(datain->offset);
2809
2810 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2811 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2812 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2813 ntohl(hdr->offset), datain->length, conn->cid);
2814 }
2815 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2816
2817 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2818 {
2819 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2820 struct iscsi_datain datain;
2821 struct iscsi_datain_req *dr;
2822 int eodr = 0, ret;
2823 bool set_statsn = false;
2824
2825 memset(&datain, 0, sizeof(struct iscsi_datain));
2826 dr = iscsit_get_datain_values(cmd, &datain);
2827 if (!dr) {
2828 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2829 cmd->init_task_tag);
2830 return -1;
2831 }
2832 /*
2833 * Be paranoid and double check the logic for now.
2834 */
2835 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2836 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2837 " datain.length: %u exceeds cmd->data_length: %u\n",
2838 cmd->init_task_tag, datain.offset, datain.length,
2839 cmd->se_cmd.data_length);
2840 return -1;
2841 }
2842
2843 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2844 /*
2845 * Special case for successfully execution w/ both DATAIN
2846 * and Sense Data.
2847 */
2848 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2849 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2850 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2851 else {
2852 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2853 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2854 iscsit_increment_maxcmdsn(cmd, conn->sess);
2855 cmd->stat_sn = conn->stat_sn++;
2856 set_statsn = true;
2857 } else if (dr->dr_complete ==
2858 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2859 set_statsn = true;
2860 }
2861
2862 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2863
2864 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2865 if (ret < 0)
2866 return ret;
2867
2868 if (dr->dr_complete) {
2869 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2870 2 : 1;
2871 iscsit_free_datain_req(cmd, dr);
2872 }
2873
2874 return eodr;
2875 }
2876
2877 int
2878 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2879 struct iscsi_logout_rsp *hdr)
2880 {
2881 struct iscsi_conn *logout_conn = NULL;
2882 struct iscsi_conn_recovery *cr = NULL;
2883 struct iscsi_session *sess = conn->sess;
2884 /*
2885 * The actual shutting down of Sessions and/or Connections
2886 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2887 * is done in scsi_logout_post_handler().
2888 */
2889 switch (cmd->logout_reason) {
2890 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2891 pr_debug("iSCSI session logout successful, setting"
2892 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2893 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2894 break;
2895 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2896 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2897 break;
2898 /*
2899 * For CLOSECONNECTION logout requests carrying
2900 * a matching logout CID -> local CID, the reference
2901 * for the local CID will have been incremented in
2902 * iscsi_logout_closeconnection().
2903 *
2904 * For CLOSECONNECTION logout requests carrying
2905 * a different CID than the connection it arrived
2906 * on, the connection responding to cmd->logout_cid
2907 * is stopped in iscsit_logout_post_handler_diffcid().
2908 */
2909
2910 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2911 " successful.\n", cmd->logout_cid, conn->cid);
2912 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2913 break;
2914 case ISCSI_LOGOUT_REASON_RECOVERY:
2915 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2916 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2917 break;
2918 /*
2919 * If the connection is still active from our point of view
2920 * force connection recovery to occur.
2921 */
2922 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2923 cmd->logout_cid);
2924 if (logout_conn) {
2925 iscsit_connection_reinstatement_rcfr(logout_conn);
2926 iscsit_dec_conn_usage_count(logout_conn);
2927 }
2928
2929 cr = iscsit_get_inactive_connection_recovery_entry(
2930 conn->sess, cmd->logout_cid);
2931 if (!cr) {
2932 pr_err("Unable to locate CID: %hu for"
2933 " REMOVECONNFORRECOVERY Logout Request.\n",
2934 cmd->logout_cid);
2935 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2936 break;
2937 }
2938
2939 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2940
2941 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2942 " for recovery for CID: %hu on CID: %hu successful.\n",
2943 cmd->logout_cid, conn->cid);
2944 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2945 break;
2946 default:
2947 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2948 cmd->logout_reason);
2949 return -1;
2950 }
2951
2952 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2953 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2954 hdr->response = cmd->logout_response;
2955 hdr->itt = cmd->init_task_tag;
2956 cmd->stat_sn = conn->stat_sn++;
2957 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2958
2959 iscsit_increment_maxcmdsn(cmd, conn->sess);
2960 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2961 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2962
2963 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2964 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2965 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2966 cmd->logout_cid, conn->cid);
2967
2968 return 0;
2969 }
2970 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2971
2972 static int
2973 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2974 {
2975 int rc;
2976
2977 rc = iscsit_build_logout_rsp(cmd, conn,
2978 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2979 if (rc < 0)
2980 return rc;
2981
2982 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2983 }
2984
2985 void
2986 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2987 struct iscsi_nopin *hdr, bool nopout_response)
2988 {
2989 hdr->opcode = ISCSI_OP_NOOP_IN;
2990 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2991 hton24(hdr->dlength, cmd->buf_ptr_size);
2992 if (nopout_response)
2993 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2994 hdr->itt = cmd->init_task_tag;
2995 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2996 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2997 conn->stat_sn;
2998 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2999
3000 if (nopout_response)
3001 iscsit_increment_maxcmdsn(cmd, conn->sess);
3002
3003 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3004 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3005
3006 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3007 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3008 "Solicited" : "Unsolicited", cmd->init_task_tag,
3009 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3010 }
3011 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3012
3013 /*
3014 * Unsolicited NOPIN, either requesting a response or not.
3015 */
3016 static int iscsit_send_unsolicited_nopin(
3017 struct iscsi_cmd *cmd,
3018 struct iscsi_conn *conn,
3019 int want_response)
3020 {
3021 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3022 int ret;
3023
3024 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3025
3026 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3027 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3028
3029 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3030 if (ret < 0)
3031 return ret;
3032
3033 spin_lock_bh(&cmd->istate_lock);
3034 cmd->i_state = want_response ?
3035 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3036 spin_unlock_bh(&cmd->istate_lock);
3037
3038 return 0;
3039 }
3040
3041 static int
3042 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3043 {
3044 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3045
3046 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3047
3048 /*
3049 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3050 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3051 */
3052 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3053
3054 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3055 cmd->buf_ptr,
3056 cmd->buf_ptr_size);
3057 }
3058
3059 static int iscsit_send_r2t(
3060 struct iscsi_cmd *cmd,
3061 struct iscsi_conn *conn)
3062 {
3063 struct iscsi_r2t *r2t;
3064 struct iscsi_r2t_rsp *hdr;
3065 int ret;
3066
3067 r2t = iscsit_get_r2t_from_list(cmd);
3068 if (!r2t)
3069 return -1;
3070
3071 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3072 memset(hdr, 0, ISCSI_HDR_LEN);
3073 hdr->opcode = ISCSI_OP_R2T;
3074 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3075 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3076 (struct scsi_lun *)&hdr->lun);
3077 hdr->itt = cmd->init_task_tag;
3078 if (conn->conn_transport->iscsit_get_r2t_ttt)
3079 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3080 else
3081 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3082 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3083 hdr->statsn = cpu_to_be32(conn->stat_sn);
3084 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3085 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3086 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3087 hdr->data_offset = cpu_to_be32(r2t->offset);
3088 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3089
3090 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3091 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3092 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3093 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3094 r2t->offset, r2t->xfer_len, conn->cid);
3095
3096 spin_lock_bh(&cmd->r2t_lock);
3097 r2t->sent_r2t = 1;
3098 spin_unlock_bh(&cmd->r2t_lock);
3099
3100 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3101 if (ret < 0) {
3102 return ret;
3103 }
3104
3105 spin_lock_bh(&cmd->dataout_timeout_lock);
3106 iscsit_start_dataout_timer(cmd, conn);
3107 spin_unlock_bh(&cmd->dataout_timeout_lock);
3108
3109 return 0;
3110 }
3111
3112 /*
3113 * @recovery: If called from iscsi_task_reassign_complete_write() for
3114 * connection recovery.
3115 */
3116 int iscsit_build_r2ts_for_cmd(
3117 struct iscsi_conn *conn,
3118 struct iscsi_cmd *cmd,
3119 bool recovery)
3120 {
3121 int first_r2t = 1;
3122 u32 offset = 0, xfer_len = 0;
3123
3124 spin_lock_bh(&cmd->r2t_lock);
3125 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3126 spin_unlock_bh(&cmd->r2t_lock);
3127 return 0;
3128 }
3129
3130 if (conn->sess->sess_ops->DataSequenceInOrder &&
3131 !recovery)
3132 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3133
3134 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3135 if (conn->sess->sess_ops->DataSequenceInOrder) {
3136 offset = cmd->r2t_offset;
3137
3138 if (first_r2t && recovery) {
3139 int new_data_end = offset +
3140 conn->sess->sess_ops->MaxBurstLength -
3141 cmd->next_burst_len;
3142
3143 if (new_data_end > cmd->se_cmd.data_length)
3144 xfer_len = cmd->se_cmd.data_length - offset;
3145 else
3146 xfer_len =
3147 conn->sess->sess_ops->MaxBurstLength -
3148 cmd->next_burst_len;
3149 } else {
3150 int new_data_end = offset +
3151 conn->sess->sess_ops->MaxBurstLength;
3152
3153 if (new_data_end > cmd->se_cmd.data_length)
3154 xfer_len = cmd->se_cmd.data_length - offset;
3155 else
3156 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3157 }
3158
3159 if ((s32)xfer_len < 0) {
3160 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3161 break;
3162 }
3163
3164 cmd->r2t_offset += xfer_len;
3165
3166 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3167 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3168 } else {
3169 struct iscsi_seq *seq;
3170
3171 seq = iscsit_get_seq_holder_for_r2t(cmd);
3172 if (!seq) {
3173 spin_unlock_bh(&cmd->r2t_lock);
3174 return -1;
3175 }
3176
3177 offset = seq->offset;
3178 xfer_len = seq->xfer_len;
3179
3180 if (cmd->seq_send_order == cmd->seq_count)
3181 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3182 }
3183 cmd->outstanding_r2ts++;
3184 first_r2t = 0;
3185
3186 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3187 spin_unlock_bh(&cmd->r2t_lock);
3188 return -1;
3189 }
3190
3191 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3192 break;
3193 }
3194 spin_unlock_bh(&cmd->r2t_lock);
3195
3196 return 0;
3197 }
3198 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3199
3200 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3201 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3202 {
3203 if (inc_stat_sn)
3204 cmd->stat_sn = conn->stat_sn++;
3205
3206 atomic_long_inc(&conn->sess->rsp_pdus);
3207
3208 memset(hdr, 0, ISCSI_HDR_LEN);
3209 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3210 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3211 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3212 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3213 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3214 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3215 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3216 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3217 }
3218 hdr->response = cmd->iscsi_response;
3219 hdr->cmd_status = cmd->se_cmd.scsi_status;
3220 hdr->itt = cmd->init_task_tag;
3221 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3222
3223 iscsit_increment_maxcmdsn(cmd, conn->sess);
3224 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3225 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3226
3227 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3228 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3229 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3230 cmd->se_cmd.scsi_status, conn->cid);
3231 }
3232 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3233
3234 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3235 {
3236 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3237 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3238 void *data_buf = NULL;
3239 u32 padding = 0, data_buf_len = 0;
3240
3241 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3242
3243 /*
3244 * Attach SENSE DATA payload to iSCSI Response PDU
3245 */
3246 if (cmd->se_cmd.sense_buffer &&
3247 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3248 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3249 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3250 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3251
3252 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3253 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3254 data_buf = cmd->sense_buffer;
3255 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3256
3257 if (padding) {
3258 memset(cmd->sense_buffer +
3259 cmd->se_cmd.scsi_sense_length, 0, padding);
3260 pr_debug("Adding %u bytes of padding to"
3261 " SENSE.\n", padding);
3262 }
3263
3264 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3265 " Response PDU\n",
3266 cmd->se_cmd.scsi_sense_length);
3267 }
3268
3269 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3270 data_buf_len);
3271 }
3272
3273 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3274 {
3275 switch (se_tmr->response) {
3276 case TMR_FUNCTION_COMPLETE:
3277 return ISCSI_TMF_RSP_COMPLETE;
3278 case TMR_TASK_DOES_NOT_EXIST:
3279 return ISCSI_TMF_RSP_NO_TASK;
3280 case TMR_LUN_DOES_NOT_EXIST:
3281 return ISCSI_TMF_RSP_NO_LUN;
3282 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3283 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3284 case TMR_FUNCTION_REJECTED:
3285 default:
3286 return ISCSI_TMF_RSP_REJECTED;
3287 }
3288 }
3289
3290 void
3291 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3292 struct iscsi_tm_rsp *hdr)
3293 {
3294 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3295
3296 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3297 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3298 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3299 hdr->itt = cmd->init_task_tag;
3300 cmd->stat_sn = conn->stat_sn++;
3301 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3302
3303 iscsit_increment_maxcmdsn(cmd, conn->sess);
3304 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3305 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3306
3307 pr_debug("Built Task Management Response ITT: 0x%08x,"
3308 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3309 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3310 }
3311 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3312
3313 static int
3314 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3315 {
3316 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3317
3318 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3319
3320 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3321 }
3322
3323 #define SENDTARGETS_BUF_LIMIT 32768U
3324
3325 static int
3326 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3327 enum iscsit_transport_type network_transport,
3328 int skip_bytes, bool *completed)
3329 {
3330 char *payload = NULL;
3331 struct iscsi_conn *conn = cmd->conn;
3332 struct iscsi_portal_group *tpg;
3333 struct iscsi_tiqn *tiqn;
3334 struct iscsi_tpg_np *tpg_np;
3335 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3336 int target_name_printed;
3337 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3338 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3339 bool active;
3340
3341 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3342 SENDTARGETS_BUF_LIMIT);
3343
3344 payload = kzalloc(buffer_len, GFP_KERNEL);
3345 if (!payload)
3346 return -ENOMEM;
3347
3348 /*
3349 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3350 * explicit case..
3351 */
3352 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3353 text_ptr = strchr(text_in, '=');
3354 if (!text_ptr) {
3355 pr_err("Unable to locate '=' string in text_in:"
3356 " %s\n", text_in);
3357 kfree(payload);
3358 return -EINVAL;
3359 }
3360 /*
3361 * Skip over '=' character..
3362 */
3363 text_ptr += 1;
3364 }
3365
3366 spin_lock(&tiqn_lock);
3367 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3368 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3369 strcmp(tiqn->tiqn, text_ptr)) {
3370 continue;
3371 }
3372
3373 target_name_printed = 0;
3374
3375 spin_lock(&tiqn->tiqn_tpg_lock);
3376 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3377
3378 /* If demo_mode_discovery=0 and generate_node_acls=0
3379 * (demo mode dislabed) do not return
3380 * TargetName+TargetAddress unless a NodeACL exists.
3381 */
3382
3383 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3384 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3385 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3386 cmd->conn->sess->sess_ops->InitiatorName))) {
3387 continue;
3388 }
3389
3390 spin_lock(&tpg->tpg_state_lock);
3391 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3392 spin_unlock(&tpg->tpg_state_lock);
3393
3394 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3395 continue;
3396
3397 spin_lock(&tpg->tpg_np_lock);
3398 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3399 tpg_np_list) {
3400 struct iscsi_np *np = tpg_np->tpg_np;
3401 struct sockaddr_storage *sockaddr;
3402
3403 if (np->np_network_transport != network_transport)
3404 continue;
3405
3406 if (!target_name_printed) {
3407 len = sprintf(buf, "TargetName=%s",
3408 tiqn->tiqn);
3409 len += 1;
3410
3411 if ((len + payload_len) > buffer_len) {
3412 spin_unlock(&tpg->tpg_np_lock);
3413 spin_unlock(&tiqn->tiqn_tpg_lock);
3414 end_of_buf = 1;
3415 goto eob;
3416 }
3417
3418 if (skip_bytes && len <= skip_bytes) {
3419 skip_bytes -= len;
3420 } else {
3421 memcpy(payload + payload_len, buf, len);
3422 payload_len += len;
3423 target_name_printed = 1;
3424 if (len > skip_bytes)
3425 skip_bytes = 0;
3426 }
3427 }
3428
3429 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3430 sockaddr = &conn->local_sockaddr;
3431 else
3432 sockaddr = &np->np_sockaddr;
3433
3434 len = sprintf(buf, "TargetAddress="
3435 "%pISpc,%hu",
3436 sockaddr,
3437 tpg->tpgt);
3438 len += 1;
3439
3440 if ((len + payload_len) > buffer_len) {
3441 spin_unlock(&tpg->tpg_np_lock);
3442 spin_unlock(&tiqn->tiqn_tpg_lock);
3443 end_of_buf = 1;
3444 goto eob;
3445 }
3446
3447 if (skip_bytes && len <= skip_bytes) {
3448 skip_bytes -= len;
3449 } else {
3450 memcpy(payload + payload_len, buf, len);
3451 payload_len += len;
3452 if (len > skip_bytes)
3453 skip_bytes = 0;
3454 }
3455 }
3456 spin_unlock(&tpg->tpg_np_lock);
3457 }
3458 spin_unlock(&tiqn->tiqn_tpg_lock);
3459 eob:
3460 if (end_of_buf) {
3461 *completed = false;
3462 break;
3463 }
3464
3465 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3466 break;
3467 }
3468 spin_unlock(&tiqn_lock);
3469
3470 cmd->buf_ptr = payload;
3471
3472 return payload_len;
3473 }
3474
3475 int
3476 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3477 struct iscsi_text_rsp *hdr,
3478 enum iscsit_transport_type network_transport)
3479 {
3480 int text_length, padding;
3481 bool completed = true;
3482
3483 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3484 cmd->read_data_done,
3485 &completed);
3486 if (text_length < 0)
3487 return text_length;
3488
3489 if (completed) {
3490 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3491 } else {
3492 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3493 cmd->read_data_done += text_length;
3494 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3495 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3496 }
3497 hdr->opcode = ISCSI_OP_TEXT_RSP;
3498 padding = ((-text_length) & 3);
3499 hton24(hdr->dlength, text_length);
3500 hdr->itt = cmd->init_task_tag;
3501 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3502 cmd->stat_sn = conn->stat_sn++;
3503 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3504
3505 iscsit_increment_maxcmdsn(cmd, conn->sess);
3506 /*
3507 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3508 * correctly increment MaxCmdSN for each response answering a
3509 * non immediate text request with a valid CmdSN.
3510 */
3511 cmd->maxcmdsn_inc = 0;
3512 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3513 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3514
3515 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3516 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3517 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3518 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3519 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3520
3521 return text_length + padding;
3522 }
3523 EXPORT_SYMBOL(iscsit_build_text_rsp);
3524
3525 static int iscsit_send_text_rsp(
3526 struct iscsi_cmd *cmd,
3527 struct iscsi_conn *conn)
3528 {
3529 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3530 int text_length;
3531
3532 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3533 conn->conn_transport->transport_type);
3534 if (text_length < 0)
3535 return text_length;
3536
3537 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3538 cmd->buf_ptr,
3539 text_length);
3540 }
3541
3542 void
3543 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3544 struct iscsi_reject *hdr)
3545 {
3546 hdr->opcode = ISCSI_OP_REJECT;
3547 hdr->reason = cmd->reject_reason;
3548 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3549 hton24(hdr->dlength, ISCSI_HDR_LEN);
3550 hdr->ffffffff = cpu_to_be32(0xffffffff);
3551 cmd->stat_sn = conn->stat_sn++;
3552 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3553 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3554 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3555
3556 }
3557 EXPORT_SYMBOL(iscsit_build_reject);
3558
3559 static int iscsit_send_reject(
3560 struct iscsi_cmd *cmd,
3561 struct iscsi_conn *conn)
3562 {
3563 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3564
3565 iscsit_build_reject(cmd, conn, hdr);
3566
3567 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3568 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3569
3570 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3571 cmd->buf_ptr,
3572 ISCSI_HDR_LEN);
3573 }
3574
3575 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3576 {
3577 int ord, cpu;
3578 /*
3579 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3580 * within iscsit_start_kthreads()
3581 *
3582 * Here we use bitmap_id to determine which CPU that this
3583 * iSCSI connection's RX/TX threads will be scheduled to
3584 * execute upon.
3585 */
3586 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3587 for_each_online_cpu(cpu) {
3588 if (ord-- == 0) {
3589 cpumask_set_cpu(cpu, conn->conn_cpumask);
3590 return;
3591 }
3592 }
3593 /*
3594 * This should never be reached..
3595 */
3596 dump_stack();
3597 cpumask_setall(conn->conn_cpumask);
3598 }
3599
3600 int
3601 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3602 {
3603 int ret;
3604
3605 switch (state) {
3606 case ISTATE_SEND_R2T:
3607 ret = iscsit_send_r2t(cmd, conn);
3608 if (ret < 0)
3609 goto err;
3610 break;
3611 case ISTATE_REMOVE:
3612 spin_lock_bh(&conn->cmd_lock);
3613 list_del_init(&cmd->i_conn_node);
3614 spin_unlock_bh(&conn->cmd_lock);
3615
3616 iscsit_free_cmd(cmd, false);
3617 break;
3618 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3619 iscsit_mod_nopin_response_timer(conn);
3620 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3621 if (ret < 0)
3622 goto err;
3623 break;
3624 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3625 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3626 if (ret < 0)
3627 goto err;
3628 break;
3629 default:
3630 pr_err("Unknown Opcode: 0x%02x ITT:"
3631 " 0x%08x, i_state: %d on CID: %hu\n",
3632 cmd->iscsi_opcode, cmd->init_task_tag, state,
3633 conn->cid);
3634 goto err;
3635 }
3636
3637 return 0;
3638
3639 err:
3640 return -1;
3641 }
3642 EXPORT_SYMBOL(iscsit_immediate_queue);
3643
3644 static int
3645 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3646 {
3647 struct iscsit_transport *t = conn->conn_transport;
3648 struct iscsi_queue_req *qr;
3649 struct iscsi_cmd *cmd;
3650 u8 state;
3651 int ret;
3652
3653 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3654 atomic_set(&conn->check_immediate_queue, 0);
3655 cmd = qr->cmd;
3656 state = qr->state;
3657 kmem_cache_free(lio_qr_cache, qr);
3658
3659 ret = t->iscsit_immediate_queue(conn, cmd, state);
3660 if (ret < 0)
3661 return ret;
3662 }
3663
3664 return 0;
3665 }
3666
3667 int
3668 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3669 {
3670 int ret;
3671
3672 check_rsp_state:
3673 switch (state) {
3674 case ISTATE_SEND_DATAIN:
3675 ret = iscsit_send_datain(cmd, conn);
3676 if (ret < 0)
3677 goto err;
3678 else if (!ret)
3679 /* more drs */
3680 goto check_rsp_state;
3681 else if (ret == 1) {
3682 /* all done */
3683 spin_lock_bh(&cmd->istate_lock);
3684 cmd->i_state = ISTATE_SENT_STATUS;
3685 spin_unlock_bh(&cmd->istate_lock);
3686
3687 if (atomic_read(&conn->check_immediate_queue))
3688 return 1;
3689
3690 return 0;
3691 } else if (ret == 2) {
3692 /* Still must send status,
3693 SCF_TRANSPORT_TASK_SENSE was set */
3694 spin_lock_bh(&cmd->istate_lock);
3695 cmd->i_state = ISTATE_SEND_STATUS;
3696 spin_unlock_bh(&cmd->istate_lock);
3697 state = ISTATE_SEND_STATUS;
3698 goto check_rsp_state;
3699 }
3700
3701 break;
3702 case ISTATE_SEND_STATUS:
3703 case ISTATE_SEND_STATUS_RECOVERY:
3704 ret = iscsit_send_response(cmd, conn);
3705 break;
3706 case ISTATE_SEND_LOGOUTRSP:
3707 ret = iscsit_send_logout(cmd, conn);
3708 break;
3709 case ISTATE_SEND_ASYNCMSG:
3710 ret = iscsit_send_conn_drop_async_message(
3711 cmd, conn);
3712 break;
3713 case ISTATE_SEND_NOPIN:
3714 ret = iscsit_send_nopin(cmd, conn);
3715 break;
3716 case ISTATE_SEND_REJECT:
3717 ret = iscsit_send_reject(cmd, conn);
3718 break;
3719 case ISTATE_SEND_TASKMGTRSP:
3720 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3721 if (ret != 0)
3722 break;
3723 ret = iscsit_tmr_post_handler(cmd, conn);
3724 if (ret != 0)
3725 iscsit_fall_back_to_erl0(conn->sess);
3726 break;
3727 case ISTATE_SEND_TEXTRSP:
3728 ret = iscsit_send_text_rsp(cmd, conn);
3729 break;
3730 default:
3731 pr_err("Unknown Opcode: 0x%02x ITT:"
3732 " 0x%08x, i_state: %d on CID: %hu\n",
3733 cmd->iscsi_opcode, cmd->init_task_tag,
3734 state, conn->cid);
3735 goto err;
3736 }
3737 if (ret < 0)
3738 goto err;
3739
3740 switch (state) {
3741 case ISTATE_SEND_LOGOUTRSP:
3742 if (!iscsit_logout_post_handler(cmd, conn))
3743 return -ECONNRESET;
3744 /* fall through */
3745 case ISTATE_SEND_STATUS:
3746 case ISTATE_SEND_ASYNCMSG:
3747 case ISTATE_SEND_NOPIN:
3748 case ISTATE_SEND_STATUS_RECOVERY:
3749 case ISTATE_SEND_TEXTRSP:
3750 case ISTATE_SEND_TASKMGTRSP:
3751 case ISTATE_SEND_REJECT:
3752 spin_lock_bh(&cmd->istate_lock);
3753 cmd->i_state = ISTATE_SENT_STATUS;
3754 spin_unlock_bh(&cmd->istate_lock);
3755 break;
3756 default:
3757 pr_err("Unknown Opcode: 0x%02x ITT:"
3758 " 0x%08x, i_state: %d on CID: %hu\n",
3759 cmd->iscsi_opcode, cmd->init_task_tag,
3760 cmd->i_state, conn->cid);
3761 goto err;
3762 }
3763
3764 if (atomic_read(&conn->check_immediate_queue))
3765 return 1;
3766
3767 return 0;
3768
3769 err:
3770 return -1;
3771 }
3772 EXPORT_SYMBOL(iscsit_response_queue);
3773
3774 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3775 {
3776 struct iscsit_transport *t = conn->conn_transport;
3777 struct iscsi_queue_req *qr;
3778 struct iscsi_cmd *cmd;
3779 u8 state;
3780 int ret;
3781
3782 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3783 cmd = qr->cmd;
3784 state = qr->state;
3785 kmem_cache_free(lio_qr_cache, qr);
3786
3787 ret = t->iscsit_response_queue(conn, cmd, state);
3788 if (ret == 1 || ret < 0)
3789 return ret;
3790 }
3791
3792 return 0;
3793 }
3794
3795 int iscsi_target_tx_thread(void *arg)
3796 {
3797 int ret = 0;
3798 struct iscsi_conn *conn = arg;
3799 bool conn_freed = false;
3800
3801 /*
3802 * Allow ourselves to be interrupted by SIGINT so that a
3803 * connection recovery / failure event can be triggered externally.
3804 */
3805 allow_signal(SIGINT);
3806
3807 while (!kthread_should_stop()) {
3808 /*
3809 * Ensure that both TX and RX per connection kthreads
3810 * are scheduled to run on the same CPU.
3811 */
3812 iscsit_thread_check_cpumask(conn, current, 1);
3813
3814 wait_event_interruptible(conn->queues_wq,
3815 !iscsit_conn_all_queues_empty(conn));
3816
3817 if (signal_pending(current))
3818 goto transport_err;
3819
3820 get_immediate:
3821 ret = iscsit_handle_immediate_queue(conn);
3822 if (ret < 0)
3823 goto transport_err;
3824
3825 ret = iscsit_handle_response_queue(conn);
3826 if (ret == 1) {
3827 goto get_immediate;
3828 } else if (ret == -ECONNRESET) {
3829 conn_freed = true;
3830 goto out;
3831 } else if (ret < 0) {
3832 goto transport_err;
3833 }
3834 }
3835
3836 transport_err:
3837 /*
3838 * Avoid the normal connection failure code-path if this connection
3839 * is still within LOGIN mode, and iscsi_np process context is
3840 * responsible for cleaning up the early connection failure.
3841 */
3842 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3843 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3844 out:
3845 if (!conn_freed) {
3846 while (!kthread_should_stop()) {
3847 msleep(100);
3848 }
3849 }
3850 return 0;
3851 }
3852
3853 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3854 {
3855 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3856 struct iscsi_cmd *cmd;
3857 int ret = 0;
3858
3859 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3860 case ISCSI_OP_SCSI_CMD:
3861 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3862 if (!cmd)
3863 goto reject;
3864
3865 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3866 break;
3867 case ISCSI_OP_SCSI_DATA_OUT:
3868 ret = iscsit_handle_data_out(conn, buf);
3869 break;
3870 case ISCSI_OP_NOOP_OUT:
3871 cmd = NULL;
3872 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3873 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3874 if (!cmd)
3875 goto reject;
3876 }
3877 ret = iscsit_handle_nop_out(conn, cmd, buf);
3878 break;
3879 case ISCSI_OP_SCSI_TMFUNC:
3880 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3881 if (!cmd)
3882 goto reject;
3883
3884 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3885 break;
3886 case ISCSI_OP_TEXT:
3887 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3888 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3889 if (!cmd)
3890 goto reject;
3891 } else {
3892 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3893 if (!cmd)
3894 goto reject;
3895 }
3896
3897 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3898 break;
3899 case ISCSI_OP_LOGOUT:
3900 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3901 if (!cmd)
3902 goto reject;
3903
3904 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3905 if (ret > 0)
3906 wait_for_completion_timeout(&conn->conn_logout_comp,
3907 SECONDS_FOR_LOGOUT_COMP * HZ);
3908 break;
3909 case ISCSI_OP_SNACK:
3910 ret = iscsit_handle_snack(conn, buf);
3911 break;
3912 default:
3913 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3914 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3915 pr_err("Cannot recover from unknown"
3916 " opcode while ERL=0, closing iSCSI connection.\n");
3917 return -1;
3918 }
3919 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3920 " closing iSCSI connection.\n");
3921 ret = -1;
3922 break;
3923 }
3924
3925 return ret;
3926 reject:
3927 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3928 }
3929
3930 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3931 {
3932 bool ret;
3933
3934 spin_lock_bh(&conn->state_lock);
3935 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3936 spin_unlock_bh(&conn->state_lock);
3937
3938 return ret;
3939 }
3940
3941 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3942 {
3943 int ret;
3944 u8 *buffer, opcode;
3945 u32 checksum = 0, digest = 0;
3946 struct kvec iov;
3947
3948 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3949 if (!buffer)
3950 return;
3951
3952 while (!kthread_should_stop()) {
3953 /*
3954 * Ensure that both TX and RX per connection kthreads
3955 * are scheduled to run on the same CPU.
3956 */
3957 iscsit_thread_check_cpumask(conn, current, 0);
3958
3959 memset(&iov, 0, sizeof(struct kvec));
3960
3961 iov.iov_base = buffer;
3962 iov.iov_len = ISCSI_HDR_LEN;
3963
3964 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3965 if (ret != ISCSI_HDR_LEN) {
3966 iscsit_rx_thread_wait_for_tcp(conn);
3967 break;
3968 }
3969
3970 if (conn->conn_ops->HeaderDigest) {
3971 iov.iov_base = &digest;
3972 iov.iov_len = ISCSI_CRC_LEN;
3973
3974 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3975 if (ret != ISCSI_CRC_LEN) {
3976 iscsit_rx_thread_wait_for_tcp(conn);
3977 break;
3978 }
3979
3980 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3981 ISCSI_HDR_LEN, 0, NULL,
3982 &checksum);
3983
3984 if (digest != checksum) {
3985 pr_err("HeaderDigest CRC32C failed,"
3986 " received 0x%08x, computed 0x%08x\n",
3987 digest, checksum);
3988 /*
3989 * Set the PDU to 0xff so it will intentionally
3990 * hit default in the switch below.
3991 */
3992 memset(buffer, 0xff, ISCSI_HDR_LEN);
3993 atomic_long_inc(&conn->sess->conn_digest_errors);
3994 } else {
3995 pr_debug("Got HeaderDigest CRC32C"
3996 " 0x%08x\n", checksum);
3997 }
3998 }
3999
4000 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4001 break;
4002
4003 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4004
4005 if (conn->sess->sess_ops->SessionType &&
4006 ((!(opcode & ISCSI_OP_TEXT)) ||
4007 (!(opcode & ISCSI_OP_LOGOUT)))) {
4008 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4009 " while in Discovery Session, rejecting.\n", opcode);
4010 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4011 buffer);
4012 break;
4013 }
4014
4015 ret = iscsi_target_rx_opcode(conn, buffer);
4016 if (ret < 0)
4017 break;
4018 }
4019
4020 kfree(buffer);
4021 }
4022
4023 int iscsi_target_rx_thread(void *arg)
4024 {
4025 int rc;
4026 struct iscsi_conn *conn = arg;
4027 bool conn_freed = false;
4028
4029 /*
4030 * Allow ourselves to be interrupted by SIGINT so that a
4031 * connection recovery / failure event can be triggered externally.
4032 */
4033 allow_signal(SIGINT);
4034 /*
4035 * Wait for iscsi_post_login_handler() to complete before allowing
4036 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4037 */
4038 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4039 if (rc < 0 || iscsi_target_check_conn_state(conn))
4040 goto out;
4041
4042 if (!conn->conn_transport->iscsit_get_rx_pdu)
4043 return 0;
4044
4045 conn->conn_transport->iscsit_get_rx_pdu(conn);
4046
4047 if (!signal_pending(current))
4048 atomic_set(&conn->transport_failed, 1);
4049 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4050
4051 out:
4052 if (!conn_freed) {
4053 while (!kthread_should_stop()) {
4054 msleep(100);
4055 }
4056 }
4057
4058 return 0;
4059 }
4060
4061 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4062 {
4063 LIST_HEAD(tmp_list);
4064 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4065 struct iscsi_session *sess = conn->sess;
4066 /*
4067 * We expect this function to only ever be called from either RX or TX
4068 * thread context via iscsit_close_connection() once the other context
4069 * has been reset -> returned sleeping pre-handler state.
4070 */
4071 spin_lock_bh(&conn->cmd_lock);
4072 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4073
4074 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4075 struct se_cmd *se_cmd = &cmd->se_cmd;
4076
4077 if (se_cmd->se_tfo != NULL) {
4078 spin_lock_irq(&se_cmd->t_state_lock);
4079 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4080 spin_unlock_irq(&se_cmd->t_state_lock);
4081 }
4082 }
4083 spin_unlock_bh(&conn->cmd_lock);
4084
4085 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4086 list_del_init(&cmd->i_conn_node);
4087
4088 iscsit_increment_maxcmdsn(cmd, sess);
4089 iscsit_free_cmd(cmd, true);
4090
4091 }
4092 }
4093
4094 static void iscsit_stop_timers_for_cmds(
4095 struct iscsi_conn *conn)
4096 {
4097 struct iscsi_cmd *cmd;
4098
4099 spin_lock_bh(&conn->cmd_lock);
4100 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4101 if (cmd->data_direction == DMA_TO_DEVICE)
4102 iscsit_stop_dataout_timer(cmd);
4103 }
4104 spin_unlock_bh(&conn->cmd_lock);
4105 }
4106
4107 int iscsit_close_connection(
4108 struct iscsi_conn *conn)
4109 {
4110 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4111 struct iscsi_session *sess = conn->sess;
4112
4113 pr_debug("Closing iSCSI connection CID %hu on SID:"
4114 " %u\n", conn->cid, sess->sid);
4115 /*
4116 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4117 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4118 * sleeping and the logout response never got sent because the
4119 * connection failed.
4120 *
4121 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4122 * to signal logout response TX interrupt completion. Go ahead and skip
4123 * this for iser since isert_rx_opcode() does not wait on logout failure,
4124 * and to avoid iscsi_conn pointer dereference in iser-target code.
4125 */
4126 if (!conn->conn_transport->rdma_shutdown)
4127 complete(&conn->conn_logout_comp);
4128
4129 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4130 if (conn->tx_thread &&
4131 cmpxchg(&conn->tx_thread_active, true, false)) {
4132 send_sig(SIGINT, conn->tx_thread, 1);
4133 kthread_stop(conn->tx_thread);
4134 }
4135 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4136 if (conn->rx_thread &&
4137 cmpxchg(&conn->rx_thread_active, true, false)) {
4138 send_sig(SIGINT, conn->rx_thread, 1);
4139 kthread_stop(conn->rx_thread);
4140 }
4141 }
4142
4143 spin_lock(&iscsit_global->ts_bitmap_lock);
4144 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4145 get_order(1));
4146 spin_unlock(&iscsit_global->ts_bitmap_lock);
4147
4148 iscsit_stop_timers_for_cmds(conn);
4149 iscsit_stop_nopin_response_timer(conn);
4150 iscsit_stop_nopin_timer(conn);
4151
4152 /*
4153 * During Connection recovery drop unacknowledged out of order
4154 * commands for this connection, and prepare the other commands
4155 * for reallegiance.
4156 *
4157 * During normal operation clear the out of order commands (but
4158 * do not free the struct iscsi_ooo_cmdsn's) and release all
4159 * struct iscsi_cmds.
4160 */
4161 if (atomic_read(&conn->connection_recovery)) {
4162 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4163 iscsit_prepare_cmds_for_reallegiance(conn);
4164 } else {
4165 iscsit_clear_ooo_cmdsns_for_conn(conn);
4166 iscsit_release_commands_from_conn(conn);
4167 }
4168 iscsit_free_queue_reqs_for_conn(conn);
4169
4170 /*
4171 * Handle decrementing session or connection usage count if
4172 * a logout response was not able to be sent because the
4173 * connection failed. Fall back to Session Recovery here.
4174 */
4175 if (atomic_read(&conn->conn_logout_remove)) {
4176 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4177 iscsit_dec_conn_usage_count(conn);
4178 iscsit_dec_session_usage_count(sess);
4179 }
4180 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4181 iscsit_dec_conn_usage_count(conn);
4182
4183 atomic_set(&conn->conn_logout_remove, 0);
4184 atomic_set(&sess->session_reinstatement, 0);
4185 atomic_set(&sess->session_fall_back_to_erl0, 1);
4186 }
4187
4188 spin_lock_bh(&sess->conn_lock);
4189 list_del(&conn->conn_list);
4190
4191 /*
4192 * Attempt to let the Initiator know this connection failed by
4193 * sending an Connection Dropped Async Message on another
4194 * active connection.
4195 */
4196 if (atomic_read(&conn->connection_recovery))
4197 iscsit_build_conn_drop_async_message(conn);
4198
4199 spin_unlock_bh(&sess->conn_lock);
4200
4201 /*
4202 * If connection reinstatement is being performed on this connection,
4203 * up the connection reinstatement semaphore that is being blocked on
4204 * in iscsit_cause_connection_reinstatement().
4205 */
4206 spin_lock_bh(&conn->state_lock);
4207 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4208 spin_unlock_bh(&conn->state_lock);
4209 complete(&conn->conn_wait_comp);
4210 wait_for_completion(&conn->conn_post_wait_comp);
4211 spin_lock_bh(&conn->state_lock);
4212 }
4213
4214 /*
4215 * If connection reinstatement is being performed on this connection
4216 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4217 * connection wait rcfr semaphore that is being blocked on
4218 * an iscsit_connection_reinstatement_rcfr().
4219 */
4220 if (atomic_read(&conn->connection_wait_rcfr)) {
4221 spin_unlock_bh(&conn->state_lock);
4222 complete(&conn->conn_wait_rcfr_comp);
4223 wait_for_completion(&conn->conn_post_wait_comp);
4224 spin_lock_bh(&conn->state_lock);
4225 }
4226 atomic_set(&conn->connection_reinstatement, 1);
4227 spin_unlock_bh(&conn->state_lock);
4228
4229 /*
4230 * If any other processes are accessing this connection pointer we
4231 * must wait until they have completed.
4232 */
4233 iscsit_check_conn_usage_count(conn);
4234 target_sess_cmd_list_set_waiting(sess->se_sess);
4235 target_wait_for_sess_cmds(sess->se_sess);
4236
4237 if (conn->conn_transport->iscsit_wait_conn)
4238 conn->conn_transport->iscsit_wait_conn(conn);
4239
4240 ahash_request_free(conn->conn_tx_hash);
4241 if (conn->conn_rx_hash) {
4242 struct crypto_ahash *tfm;
4243
4244 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4245 ahash_request_free(conn->conn_rx_hash);
4246 crypto_free_ahash(tfm);
4247 }
4248
4249 if (conn->sock)
4250 sock_release(conn->sock);
4251
4252 if (conn->conn_transport->iscsit_free_conn)
4253 conn->conn_transport->iscsit_free_conn(conn);
4254
4255 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4256 conn->conn_state = TARG_CONN_STATE_FREE;
4257 iscsit_free_conn(conn);
4258
4259 spin_lock_bh(&sess->conn_lock);
4260 atomic_dec(&sess->nconn);
4261 pr_debug("Decremented iSCSI connection count to %hu from node:"
4262 " %s\n", atomic_read(&sess->nconn),
4263 sess->sess_ops->InitiatorName);
4264 /*
4265 * Make sure that if one connection fails in an non ERL=2 iSCSI
4266 * Session that they all fail.
4267 */
4268 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4269 !atomic_read(&sess->session_logout))
4270 atomic_set(&sess->session_fall_back_to_erl0, 1);
4271
4272 /*
4273 * If this was not the last connection in the session, and we are
4274 * performing session reinstatement or falling back to ERL=0, call
4275 * iscsit_stop_session() without sleeping to shutdown the other
4276 * active connections.
4277 */
4278 if (atomic_read(&sess->nconn)) {
4279 if (!atomic_read(&sess->session_reinstatement) &&
4280 !atomic_read(&sess->session_fall_back_to_erl0)) {
4281 spin_unlock_bh(&sess->conn_lock);
4282 return 0;
4283 }
4284 if (!atomic_read(&sess->session_stop_active)) {
4285 atomic_set(&sess->session_stop_active, 1);
4286 spin_unlock_bh(&sess->conn_lock);
4287 iscsit_stop_session(sess, 0, 0);
4288 return 0;
4289 }
4290 spin_unlock_bh(&sess->conn_lock);
4291 return 0;
4292 }
4293
4294 /*
4295 * If this was the last connection in the session and one of the
4296 * following is occurring:
4297 *
4298 * Session Reinstatement is not being performed, and are falling back
4299 * to ERL=0 call iscsit_close_session().
4300 *
4301 * Session Logout was requested. iscsit_close_session() will be called
4302 * elsewhere.
4303 *
4304 * Session Continuation is not being performed, start the Time2Retain
4305 * handler and check if sleep_on_sess_wait_sem is active.
4306 */
4307 if (!atomic_read(&sess->session_reinstatement) &&
4308 atomic_read(&sess->session_fall_back_to_erl0)) {
4309 spin_unlock_bh(&sess->conn_lock);
4310 iscsit_close_session(sess);
4311
4312 return 0;
4313 } else if (atomic_read(&sess->session_logout)) {
4314 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4315 sess->session_state = TARG_SESS_STATE_FREE;
4316 spin_unlock_bh(&sess->conn_lock);
4317
4318 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4319 complete(&sess->session_wait_comp);
4320
4321 return 0;
4322 } else {
4323 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4324 sess->session_state = TARG_SESS_STATE_FAILED;
4325
4326 if (!atomic_read(&sess->session_continuation)) {
4327 spin_unlock_bh(&sess->conn_lock);
4328 iscsit_start_time2retain_handler(sess);
4329 } else
4330 spin_unlock_bh(&sess->conn_lock);
4331
4332 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4333 complete(&sess->session_wait_comp);
4334
4335 return 0;
4336 }
4337 }
4338
4339 /*
4340 * If the iSCSI Session for the iSCSI Initiator Node exists,
4341 * forcefully shutdown the iSCSI NEXUS.
4342 */
4343 int iscsit_close_session(struct iscsi_session *sess)
4344 {
4345 struct iscsi_portal_group *tpg = sess->tpg;
4346 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4347
4348 if (atomic_read(&sess->nconn)) {
4349 pr_err("%d connection(s) still exist for iSCSI session"
4350 " to %s\n", atomic_read(&sess->nconn),
4351 sess->sess_ops->InitiatorName);
4352 BUG();
4353 }
4354
4355 spin_lock_bh(&se_tpg->session_lock);
4356 atomic_set(&sess->session_logout, 1);
4357 atomic_set(&sess->session_reinstatement, 1);
4358 iscsit_stop_time2retain_timer(sess);
4359 spin_unlock_bh(&se_tpg->session_lock);
4360
4361 /*
4362 * transport_deregister_session_configfs() will clear the
4363 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4364 * can be setting it again with __transport_register_session() in
4365 * iscsi_post_login_handler() again after the iscsit_stop_session()
4366 * completes in iscsi_np context.
4367 */
4368 transport_deregister_session_configfs(sess->se_sess);
4369
4370 /*
4371 * If any other processes are accessing this session pointer we must
4372 * wait until they have completed. If we are in an interrupt (the
4373 * time2retain handler) and contain and active session usage count we
4374 * restart the timer and exit.
4375 */
4376 if (!in_interrupt()) {
4377 if (iscsit_check_session_usage_count(sess) == 1)
4378 iscsit_stop_session(sess, 1, 1);
4379 } else {
4380 if (iscsit_check_session_usage_count(sess) == 2) {
4381 atomic_set(&sess->session_logout, 0);
4382 iscsit_start_time2retain_handler(sess);
4383 return 0;
4384 }
4385 }
4386
4387 transport_deregister_session(sess->se_sess);
4388
4389 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4390 iscsit_free_connection_recovery_entries(sess);
4391
4392 iscsit_free_all_ooo_cmdsns(sess);
4393
4394 spin_lock_bh(&se_tpg->session_lock);
4395 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4396 sess->session_state = TARG_SESS_STATE_FREE;
4397 pr_debug("Released iSCSI session from node: %s\n",
4398 sess->sess_ops->InitiatorName);
4399 tpg->nsessions--;
4400 if (tpg->tpg_tiqn)
4401 tpg->tpg_tiqn->tiqn_nsessions--;
4402
4403 pr_debug("Decremented number of active iSCSI Sessions on"
4404 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4405
4406 ida_free(&sess_ida, sess->session_index);
4407 kfree(sess->sess_ops);
4408 sess->sess_ops = NULL;
4409 spin_unlock_bh(&se_tpg->session_lock);
4410
4411 kfree(sess);
4412 return 0;
4413 }
4414
4415 static void iscsit_logout_post_handler_closesession(
4416 struct iscsi_conn *conn)
4417 {
4418 struct iscsi_session *sess = conn->sess;
4419 int sleep = 1;
4420 /*
4421 * Traditional iscsi/tcp will invoke this logic from TX thread
4422 * context during session logout, so clear tx_thread_active and
4423 * sleep if iscsit_close_connection() has not already occured.
4424 *
4425 * Since iser-target invokes this logic from it's own workqueue,
4426 * always sleep waiting for RX/TX thread shutdown to complete
4427 * within iscsit_close_connection().
4428 */
4429 if (!conn->conn_transport->rdma_shutdown) {
4430 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4431 if (!sleep)
4432 return;
4433 }
4434
4435 atomic_set(&conn->conn_logout_remove, 0);
4436 complete(&conn->conn_logout_comp);
4437
4438 iscsit_dec_conn_usage_count(conn);
4439 iscsit_stop_session(sess, sleep, sleep);
4440 iscsit_dec_session_usage_count(sess);
4441 iscsit_close_session(sess);
4442 }
4443
4444 static void iscsit_logout_post_handler_samecid(
4445 struct iscsi_conn *conn)
4446 {
4447 int sleep = 1;
4448
4449 if (!conn->conn_transport->rdma_shutdown) {
4450 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4451 if (!sleep)
4452 return;
4453 }
4454
4455 atomic_set(&conn->conn_logout_remove, 0);
4456 complete(&conn->conn_logout_comp);
4457
4458 iscsit_cause_connection_reinstatement(conn, sleep);
4459 iscsit_dec_conn_usage_count(conn);
4460 }
4461
4462 static void iscsit_logout_post_handler_diffcid(
4463 struct iscsi_conn *conn,
4464 u16 cid)
4465 {
4466 struct iscsi_conn *l_conn;
4467 struct iscsi_session *sess = conn->sess;
4468 bool conn_found = false;
4469
4470 if (!sess)
4471 return;
4472
4473 spin_lock_bh(&sess->conn_lock);
4474 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4475 if (l_conn->cid == cid) {
4476 iscsit_inc_conn_usage_count(l_conn);
4477 conn_found = true;
4478 break;
4479 }
4480 }
4481 spin_unlock_bh(&sess->conn_lock);
4482
4483 if (!conn_found)
4484 return;
4485
4486 if (l_conn->sock)
4487 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4488
4489 spin_lock_bh(&l_conn->state_lock);
4490 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4491 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4492 spin_unlock_bh(&l_conn->state_lock);
4493
4494 iscsit_cause_connection_reinstatement(l_conn, 1);
4495 iscsit_dec_conn_usage_count(l_conn);
4496 }
4497
4498 /*
4499 * Return of 0 causes the TX thread to restart.
4500 */
4501 int iscsit_logout_post_handler(
4502 struct iscsi_cmd *cmd,
4503 struct iscsi_conn *conn)
4504 {
4505 int ret = 0;
4506
4507 switch (cmd->logout_reason) {
4508 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4509 switch (cmd->logout_response) {
4510 case ISCSI_LOGOUT_SUCCESS:
4511 case ISCSI_LOGOUT_CLEANUP_FAILED:
4512 default:
4513 iscsit_logout_post_handler_closesession(conn);
4514 break;
4515 }
4516 ret = 0;
4517 break;
4518 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4519 if (conn->cid == cmd->logout_cid) {
4520 switch (cmd->logout_response) {
4521 case ISCSI_LOGOUT_SUCCESS:
4522 case ISCSI_LOGOUT_CLEANUP_FAILED:
4523 default:
4524 iscsit_logout_post_handler_samecid(conn);
4525 break;
4526 }
4527 ret = 0;
4528 } else {
4529 switch (cmd->logout_response) {
4530 case ISCSI_LOGOUT_SUCCESS:
4531 iscsit_logout_post_handler_diffcid(conn,
4532 cmd->logout_cid);
4533 break;
4534 case ISCSI_LOGOUT_CID_NOT_FOUND:
4535 case ISCSI_LOGOUT_CLEANUP_FAILED:
4536 default:
4537 break;
4538 }
4539 ret = 1;
4540 }
4541 break;
4542 case ISCSI_LOGOUT_REASON_RECOVERY:
4543 switch (cmd->logout_response) {
4544 case ISCSI_LOGOUT_SUCCESS:
4545 case ISCSI_LOGOUT_CID_NOT_FOUND:
4546 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4547 case ISCSI_LOGOUT_CLEANUP_FAILED:
4548 default:
4549 break;
4550 }
4551 ret = 1;
4552 break;
4553 default:
4554 break;
4555
4556 }
4557 return ret;
4558 }
4559 EXPORT_SYMBOL(iscsit_logout_post_handler);
4560
4561 void iscsit_fail_session(struct iscsi_session *sess)
4562 {
4563 struct iscsi_conn *conn;
4564
4565 spin_lock_bh(&sess->conn_lock);
4566 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4567 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4568 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4569 }
4570 spin_unlock_bh(&sess->conn_lock);
4571
4572 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4573 sess->session_state = TARG_SESS_STATE_FAILED;
4574 }
4575
4576 int iscsit_free_session(struct iscsi_session *sess)
4577 {
4578 u16 conn_count = atomic_read(&sess->nconn);
4579 struct iscsi_conn *conn, *conn_tmp = NULL;
4580 int is_last;
4581
4582 spin_lock_bh(&sess->conn_lock);
4583 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4584
4585 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4586 conn_list) {
4587 if (conn_count == 0)
4588 break;
4589
4590 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4591 is_last = 1;
4592 } else {
4593 iscsit_inc_conn_usage_count(conn_tmp);
4594 is_last = 0;
4595 }
4596 iscsit_inc_conn_usage_count(conn);
4597
4598 spin_unlock_bh(&sess->conn_lock);
4599 iscsit_cause_connection_reinstatement(conn, 1);
4600 spin_lock_bh(&sess->conn_lock);
4601
4602 iscsit_dec_conn_usage_count(conn);
4603 if (is_last == 0)
4604 iscsit_dec_conn_usage_count(conn_tmp);
4605
4606 conn_count--;
4607 }
4608
4609 if (atomic_read(&sess->nconn)) {
4610 spin_unlock_bh(&sess->conn_lock);
4611 wait_for_completion(&sess->session_wait_comp);
4612 } else
4613 spin_unlock_bh(&sess->conn_lock);
4614
4615 iscsit_close_session(sess);
4616 return 0;
4617 }
4618
4619 void iscsit_stop_session(
4620 struct iscsi_session *sess,
4621 int session_sleep,
4622 int connection_sleep)
4623 {
4624 u16 conn_count = atomic_read(&sess->nconn);
4625 struct iscsi_conn *conn, *conn_tmp = NULL;
4626 int is_last;
4627
4628 spin_lock_bh(&sess->conn_lock);
4629 if (session_sleep)
4630 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4631
4632 if (connection_sleep) {
4633 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4634 conn_list) {
4635 if (conn_count == 0)
4636 break;
4637
4638 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4639 is_last = 1;
4640 } else {
4641 iscsit_inc_conn_usage_count(conn_tmp);
4642 is_last = 0;
4643 }
4644 iscsit_inc_conn_usage_count(conn);
4645
4646 spin_unlock_bh(&sess->conn_lock);
4647 iscsit_cause_connection_reinstatement(conn, 1);
4648 spin_lock_bh(&sess->conn_lock);
4649
4650 iscsit_dec_conn_usage_count(conn);
4651 if (is_last == 0)
4652 iscsit_dec_conn_usage_count(conn_tmp);
4653 conn_count--;
4654 }
4655 } else {
4656 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4657 iscsit_cause_connection_reinstatement(conn, 0);
4658 }
4659
4660 if (session_sleep && atomic_read(&sess->nconn)) {
4661 spin_unlock_bh(&sess->conn_lock);
4662 wait_for_completion(&sess->session_wait_comp);
4663 } else
4664 spin_unlock_bh(&sess->conn_lock);
4665 }
4666
4667 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4668 {
4669 struct iscsi_session *sess;
4670 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4671 struct se_session *se_sess, *se_sess_tmp;
4672 LIST_HEAD(free_list);
4673 int session_count = 0;
4674
4675 spin_lock_bh(&se_tpg->session_lock);
4676 if (tpg->nsessions && !force) {
4677 spin_unlock_bh(&se_tpg->session_lock);
4678 return -1;
4679 }
4680
4681 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4682 sess_list) {
4683 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4684
4685 spin_lock(&sess->conn_lock);
4686 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4687 atomic_read(&sess->session_logout) ||
4688 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4689 spin_unlock(&sess->conn_lock);
4690 continue;
4691 }
4692 atomic_set(&sess->session_reinstatement, 1);
4693 atomic_set(&sess->session_fall_back_to_erl0, 1);
4694 spin_unlock(&sess->conn_lock);
4695
4696 list_move_tail(&se_sess->sess_list, &free_list);
4697 }
4698 spin_unlock_bh(&se_tpg->session_lock);
4699
4700 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4701 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4702
4703 iscsit_free_session(sess);
4704 session_count++;
4705 }
4706
4707 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4708 " Group: %hu\n", session_count, tpg->tpgt);
4709 return 0;
4710 }
4711
4712 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4713 MODULE_VERSION("4.1.x");
4714 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4715 MODULE_LICENSE("GPL");
4716
4717 module_init(iscsi_target_init_module);
4718 module_exit(iscsi_target_cleanup_module);
Linux with added FPC-III support