1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19 #include <linux/string.h>
20 #include <linux/kthread.h>
21 #include <linux/crypto.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
25 #include <linux/idr.h>
26 #include <asm/unaligned.h>
27 #include <scsi/scsi_proto.h>
28 #include <scsi/iscsi_proto.h>
29 #include <scsi/scsi_tcq.h>
30 #include <target/target_core_base.h>
31 #include <target/target_core_fabric.h>
32
33 #include <target/iscsi/iscsi_target_core.h>
34 #include "iscsi_target_parameters.h"
35 #include "iscsi_target_seq_pdu_list.h"
36 #include "iscsi_target_datain_values.h"
37 #include "iscsi_target_erl0.h"
38 #include "iscsi_target_erl1.h"
39 #include "iscsi_target_erl2.h"
40 #include "iscsi_target_login.h"
41 #include "iscsi_target_tmr.h"
42 #include "iscsi_target_tpg.h"
43 #include "iscsi_target_util.h"
44 #include "iscsi_target.h"
45 #include "iscsi_target_device.h"
46 #include <target/iscsi/iscsi_target_stat.h>
47
48 #include <target/iscsi/iscsi_transport.h>
49
50 static LIST_HEAD(g_tiqn_list);
51 static LIST_HEAD(g_np_list);
52 static DEFINE_SPINLOCK(tiqn_lock);
53 static DEFINE_MUTEX(np_lock);
54
55 static struct idr tiqn_idr;
56 struct idr sess_idr;
57 struct mutex auth_id_lock;
58 spinlock_t sess_idr_lock;
59
60 struct iscsit_global *iscsit_global;
61
62 struct kmem_cache *lio_qr_cache;
63 struct kmem_cache *lio_dr_cache;
64 struct kmem_cache *lio_ooo_cache;
65 struct kmem_cache *lio_r2t_cache;
66
67 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
68 struct iscsi_scsi_req *, u32);
69
iscsit_get_tiqn_for_login(unsigned char * buf)70 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
71 {
72 struct iscsi_tiqn *tiqn = NULL;
73
74 spin_lock(&tiqn_lock);
75 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
76 if (!strcmp(tiqn->tiqn, buf)) {
77
78 spin_lock(&tiqn->tiqn_state_lock);
79 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
80 tiqn->tiqn_access_count++;
81 spin_unlock(&tiqn->tiqn_state_lock);
82 spin_unlock(&tiqn_lock);
83 return tiqn;
84 }
85 spin_unlock(&tiqn->tiqn_state_lock);
86 }
87 }
88 spin_unlock(&tiqn_lock);
89
90 return NULL;
91 }
92
iscsit_set_tiqn_shutdown(struct iscsi_tiqn * tiqn)93 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
94 {
95 spin_lock(&tiqn->tiqn_state_lock);
96 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
97 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
98 spin_unlock(&tiqn->tiqn_state_lock);
99 return 0;
100 }
101 spin_unlock(&tiqn->tiqn_state_lock);
102
103 return -1;
104 }
105
iscsit_put_tiqn_for_login(struct iscsi_tiqn * tiqn)106 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
107 {
108 spin_lock(&tiqn->tiqn_state_lock);
109 tiqn->tiqn_access_count--;
110 spin_unlock(&tiqn->tiqn_state_lock);
111 }
112
113 /*
114 * Note that IQN formatting is expected to be done in userspace, and
115 * no explict IQN format checks are done here.
116 */
iscsit_add_tiqn(unsigned char * buf)117 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
118 {
119 struct iscsi_tiqn *tiqn = NULL;
120 int ret;
121
122 if (strlen(buf) >= ISCSI_IQN_LEN) {
123 pr_err("Target IQN exceeds %d bytes\n",
124 ISCSI_IQN_LEN);
125 return ERR_PTR(-EINVAL);
126 }
127
128 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
129 if (!tiqn) {
130 pr_err("Unable to allocate struct iscsi_tiqn\n");
131 return ERR_PTR(-ENOMEM);
132 }
133
134 sprintf(tiqn->tiqn, "%s", buf);
135 INIT_LIST_HEAD(&tiqn->tiqn_list);
136 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
137 spin_lock_init(&tiqn->tiqn_state_lock);
138 spin_lock_init(&tiqn->tiqn_tpg_lock);
139 spin_lock_init(&tiqn->sess_err_stats.lock);
140 spin_lock_init(&tiqn->login_stats.lock);
141 spin_lock_init(&tiqn->logout_stats.lock);
142
143 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
144
145 idr_preload(GFP_KERNEL);
146 spin_lock(&tiqn_lock);
147
148 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
149 if (ret < 0) {
150 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
151 spin_unlock(&tiqn_lock);
152 idr_preload_end();
153 kfree(tiqn);
154 return ERR_PTR(ret);
155 }
156 tiqn->tiqn_index = ret;
157 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
158
159 spin_unlock(&tiqn_lock);
160 idr_preload_end();
161
162 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
163
164 return tiqn;
165
166 }
167
iscsit_wait_for_tiqn(struct iscsi_tiqn * tiqn)168 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
169 {
170 /*
171 * Wait for accesses to said struct iscsi_tiqn to end.
172 */
173 spin_lock(&tiqn->tiqn_state_lock);
174 while (tiqn->tiqn_access_count != 0) {
175 spin_unlock(&tiqn->tiqn_state_lock);
176 msleep(10);
177 spin_lock(&tiqn->tiqn_state_lock);
178 }
179 spin_unlock(&tiqn->tiqn_state_lock);
180 }
181
iscsit_del_tiqn(struct iscsi_tiqn * tiqn)182 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
183 {
184 /*
185 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
186 * while holding tiqn->tiqn_state_lock. This means that all subsequent
187 * attempts to access this struct iscsi_tiqn will fail from both transport
188 * fabric and control code paths.
189 */
190 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
191 pr_err("iscsit_set_tiqn_shutdown() failed\n");
192 return;
193 }
194
195 iscsit_wait_for_tiqn(tiqn);
196
197 spin_lock(&tiqn_lock);
198 list_del(&tiqn->tiqn_list);
199 idr_remove(&tiqn_idr, tiqn->tiqn_index);
200 spin_unlock(&tiqn_lock);
201
202 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
203 tiqn->tiqn);
204 kfree(tiqn);
205 }
206
iscsit_access_np(struct iscsi_np * np,struct iscsi_portal_group * tpg)207 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
208 {
209 int ret;
210 /*
211 * Determine if the network portal is accepting storage traffic.
212 */
213 spin_lock_bh(&np->np_thread_lock);
214 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
215 spin_unlock_bh(&np->np_thread_lock);
216 return -1;
217 }
218 spin_unlock_bh(&np->np_thread_lock);
219 /*
220 * Determine if the portal group is accepting storage traffic.
221 */
222 spin_lock_bh(&tpg->tpg_state_lock);
223 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
224 spin_unlock_bh(&tpg->tpg_state_lock);
225 return -1;
226 }
227 spin_unlock_bh(&tpg->tpg_state_lock);
228
229 /*
230 * Here we serialize access across the TIQN+TPG Tuple.
231 */
232 ret = down_interruptible(&tpg->np_login_sem);
233 if (ret != 0)
234 return -1;
235
236 spin_lock_bh(&tpg->tpg_state_lock);
237 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
238 spin_unlock_bh(&tpg->tpg_state_lock);
239 up(&tpg->np_login_sem);
240 return -1;
241 }
242 spin_unlock_bh(&tpg->tpg_state_lock);
243
244 return 0;
245 }
246
iscsit_login_kref_put(struct kref * kref)247 void iscsit_login_kref_put(struct kref *kref)
248 {
249 struct iscsi_tpg_np *tpg_np = container_of(kref,
250 struct iscsi_tpg_np, tpg_np_kref);
251
252 complete(&tpg_np->tpg_np_comp);
253 }
254
iscsit_deaccess_np(struct iscsi_np * np,struct iscsi_portal_group * tpg,struct iscsi_tpg_np * tpg_np)255 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
256 struct iscsi_tpg_np *tpg_np)
257 {
258 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
259
260 up(&tpg->np_login_sem);
261
262 if (tpg_np)
263 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
264
265 if (tiqn)
266 iscsit_put_tiqn_for_login(tiqn);
267
268 return 0;
269 }
270
iscsit_check_np_match(struct sockaddr_storage * sockaddr,struct iscsi_np * np,int network_transport)271 bool iscsit_check_np_match(
272 struct sockaddr_storage *sockaddr,
273 struct iscsi_np *np,
274 int network_transport)
275 {
276 struct sockaddr_in *sock_in, *sock_in_e;
277 struct sockaddr_in6 *sock_in6, *sock_in6_e;
278 bool ip_match = false;
279 u16 port, port_e;
280
281 if (sockaddr->ss_family == AF_INET6) {
282 sock_in6 = (struct sockaddr_in6 *)sockaddr;
283 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
284
285 if (!memcmp(&sock_in6->sin6_addr.in6_u,
286 &sock_in6_e->sin6_addr.in6_u,
287 sizeof(struct in6_addr)))
288 ip_match = true;
289
290 port = ntohs(sock_in6->sin6_port);
291 port_e = ntohs(sock_in6_e->sin6_port);
292 } else {
293 sock_in = (struct sockaddr_in *)sockaddr;
294 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
295
296 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
297 ip_match = true;
298
299 port = ntohs(sock_in->sin_port);
300 port_e = ntohs(sock_in_e->sin_port);
301 }
302
303 if (ip_match && (port_e == port) &&
304 (np->np_network_transport == network_transport))
305 return true;
306
307 return false;
308 }
309
310 /*
311 * Called with mutex np_lock held
312 */
iscsit_get_np(struct sockaddr_storage * sockaddr,int network_transport)313 static struct iscsi_np *iscsit_get_np(
314 struct sockaddr_storage *sockaddr,
315 int network_transport)
316 {
317 struct iscsi_np *np;
318 bool match;
319
320 list_for_each_entry(np, &g_np_list, np_list) {
321 spin_lock_bh(&np->np_thread_lock);
322 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
323 spin_unlock_bh(&np->np_thread_lock);
324 continue;
325 }
326
327 match = iscsit_check_np_match(sockaddr, np, network_transport);
328 if (match) {
329 /*
330 * Increment the np_exports reference count now to
331 * prevent iscsit_del_np() below from being called
332 * while iscsi_tpg_add_network_portal() is called.
333 */
334 np->np_exports++;
335 spin_unlock_bh(&np->np_thread_lock);
336 return np;
337 }
338 spin_unlock_bh(&np->np_thread_lock);
339 }
340
341 return NULL;
342 }
343
iscsit_add_np(struct sockaddr_storage * sockaddr,int network_transport)344 struct iscsi_np *iscsit_add_np(
345 struct sockaddr_storage *sockaddr,
346 int network_transport)
347 {
348 struct iscsi_np *np;
349 int ret;
350
351 mutex_lock(&np_lock);
352
353 /*
354 * Locate the existing struct iscsi_np if already active..
355 */
356 np = iscsit_get_np(sockaddr, network_transport);
357 if (np) {
358 mutex_unlock(&np_lock);
359 return np;
360 }
361
362 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
363 if (!np) {
364 pr_err("Unable to allocate memory for struct iscsi_np\n");
365 mutex_unlock(&np_lock);
366 return ERR_PTR(-ENOMEM);
367 }
368
369 np->np_flags |= NPF_IP_NETWORK;
370 np->np_network_transport = network_transport;
371 spin_lock_init(&np->np_thread_lock);
372 init_completion(&np->np_restart_comp);
373 INIT_LIST_HEAD(&np->np_list);
374
375 ret = iscsi_target_setup_login_socket(np, sockaddr);
376 if (ret != 0) {
377 kfree(np);
378 mutex_unlock(&np_lock);
379 return ERR_PTR(ret);
380 }
381
382 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
383 if (IS_ERR(np->np_thread)) {
384 pr_err("Unable to create kthread: iscsi_np\n");
385 ret = PTR_ERR(np->np_thread);
386 kfree(np);
387 mutex_unlock(&np_lock);
388 return ERR_PTR(ret);
389 }
390 /*
391 * Increment the np_exports reference count now to prevent
392 * iscsit_del_np() below from being run while a new call to
393 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
394 * active. We don't need to hold np->np_thread_lock at this
395 * point because iscsi_np has not been added to g_np_list yet.
396 */
397 np->np_exports = 1;
398 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
399
400 list_add_tail(&np->np_list, &g_np_list);
401 mutex_unlock(&np_lock);
402
403 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
404 &np->np_sockaddr, np->np_transport->name);
405
406 return np;
407 }
408
iscsit_reset_np_thread(struct iscsi_np * np,struct iscsi_tpg_np * tpg_np,struct iscsi_portal_group * tpg,bool shutdown)409 int iscsit_reset_np_thread(
410 struct iscsi_np *np,
411 struct iscsi_tpg_np *tpg_np,
412 struct iscsi_portal_group *tpg,
413 bool shutdown)
414 {
415 spin_lock_bh(&np->np_thread_lock);
416 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
417 spin_unlock_bh(&np->np_thread_lock);
418 return 0;
419 }
420 np->np_thread_state = ISCSI_NP_THREAD_RESET;
421 atomic_inc(&np->np_reset_count);
422
423 if (np->np_thread) {
424 spin_unlock_bh(&np->np_thread_lock);
425 send_sig(SIGINT, np->np_thread, 1);
426 wait_for_completion(&np->np_restart_comp);
427 spin_lock_bh(&np->np_thread_lock);
428 }
429 spin_unlock_bh(&np->np_thread_lock);
430
431 if (tpg_np && shutdown) {
432 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
433
434 wait_for_completion(&tpg_np->tpg_np_comp);
435 }
436
437 return 0;
438 }
439
iscsit_free_np(struct iscsi_np * np)440 static void iscsit_free_np(struct iscsi_np *np)
441 {
442 if (np->np_socket)
443 sock_release(np->np_socket);
444 }
445
iscsit_del_np(struct iscsi_np * np)446 int iscsit_del_np(struct iscsi_np *np)
447 {
448 spin_lock_bh(&np->np_thread_lock);
449 np->np_exports--;
450 if (np->np_exports) {
451 np->enabled = true;
452 spin_unlock_bh(&np->np_thread_lock);
453 return 0;
454 }
455 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
456 spin_unlock_bh(&np->np_thread_lock);
457
458 if (np->np_thread) {
459 /*
460 * We need to send the signal to wakeup Linux/Net
461 * which may be sleeping in sock_accept()..
462 */
463 send_sig(SIGINT, np->np_thread, 1);
464 kthread_stop(np->np_thread);
465 np->np_thread = NULL;
466 }
467
468 np->np_transport->iscsit_free_np(np);
469
470 mutex_lock(&np_lock);
471 list_del(&np->np_list);
472 mutex_unlock(&np_lock);
473
474 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
475 &np->np_sockaddr, np->np_transport->name);
476
477 iscsit_put_transport(np->np_transport);
478 kfree(np);
479 return 0;
480 }
481
482 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
483 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
484
iscsit_queue_rsp(struct iscsi_conn * conn,struct iscsi_cmd * cmd)485 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
486 {
487 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
488 return 0;
489 }
490
iscsit_aborted_task(struct iscsi_conn * conn,struct iscsi_cmd * cmd)491 static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
492 {
493 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
494
495 spin_lock_bh(&conn->cmd_lock);
496 if (!list_empty(&cmd->i_conn_node))
497 list_del_init(&cmd->i_conn_node);
498 spin_unlock_bh(&conn->cmd_lock);
499
500 __iscsit_free_cmd(cmd, scsi_cmd, true);
501 }
502
iscsit_get_sup_prot_ops(struct iscsi_conn * conn)503 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
504 {
505 return TARGET_PROT_NORMAL;
506 }
507
508 static struct iscsit_transport iscsi_target_transport = {
509 .name = "iSCSI/TCP",
510 .transport_type = ISCSI_TCP,
511 .owner = NULL,
512 .iscsit_setup_np = iscsit_setup_np,
513 .iscsit_accept_np = iscsit_accept_np,
514 .iscsit_free_np = iscsit_free_np,
515 .iscsit_get_login_rx = iscsit_get_login_rx,
516 .iscsit_put_login_tx = iscsit_put_login_tx,
517 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
518 .iscsit_immediate_queue = iscsit_immediate_queue,
519 .iscsit_response_queue = iscsit_response_queue,
520 .iscsit_queue_data_in = iscsit_queue_rsp,
521 .iscsit_queue_status = iscsit_queue_rsp,
522 .iscsit_aborted_task = iscsit_aborted_task,
523 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
524 };
525
iscsi_target_init_module(void)526 static int __init iscsi_target_init_module(void)
527 {
528 int ret = 0, size;
529
530 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
531
532 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
533 if (!iscsit_global) {
534 pr_err("Unable to allocate memory for iscsit_global\n");
535 return -1;
536 }
537 spin_lock_init(&iscsit_global->ts_bitmap_lock);
538 mutex_init(&auth_id_lock);
539 spin_lock_init(&sess_idr_lock);
540 idr_init(&tiqn_idr);
541 idr_init(&sess_idr);
542
543 ret = target_register_template(&iscsi_ops);
544 if (ret)
545 goto out;
546
547 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
548 iscsit_global->ts_bitmap = vzalloc(size);
549 if (!iscsit_global->ts_bitmap) {
550 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
551 goto configfs_out;
552 }
553
554 lio_qr_cache = kmem_cache_create("lio_qr_cache",
555 sizeof(struct iscsi_queue_req),
556 __alignof__(struct iscsi_queue_req), 0, NULL);
557 if (!lio_qr_cache) {
558 pr_err("nable to kmem_cache_create() for"
559 " lio_qr_cache\n");
560 goto bitmap_out;
561 }
562
563 lio_dr_cache = kmem_cache_create("lio_dr_cache",
564 sizeof(struct iscsi_datain_req),
565 __alignof__(struct iscsi_datain_req), 0, NULL);
566 if (!lio_dr_cache) {
567 pr_err("Unable to kmem_cache_create() for"
568 " lio_dr_cache\n");
569 goto qr_out;
570 }
571
572 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
573 sizeof(struct iscsi_ooo_cmdsn),
574 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
575 if (!lio_ooo_cache) {
576 pr_err("Unable to kmem_cache_create() for"
577 " lio_ooo_cache\n");
578 goto dr_out;
579 }
580
581 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
582 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
583 0, NULL);
584 if (!lio_r2t_cache) {
585 pr_err("Unable to kmem_cache_create() for"
586 " lio_r2t_cache\n");
587 goto ooo_out;
588 }
589
590 iscsit_register_transport(&iscsi_target_transport);
591
592 if (iscsit_load_discovery_tpg() < 0)
593 goto r2t_out;
594
595 return ret;
596 r2t_out:
597 iscsit_unregister_transport(&iscsi_target_transport);
598 kmem_cache_destroy(lio_r2t_cache);
599 ooo_out:
600 kmem_cache_destroy(lio_ooo_cache);
601 dr_out:
602 kmem_cache_destroy(lio_dr_cache);
603 qr_out:
604 kmem_cache_destroy(lio_qr_cache);
605 bitmap_out:
606 vfree(iscsit_global->ts_bitmap);
607 configfs_out:
608 /* XXX: this probably wants it to be it's own unwind step.. */
609 if (iscsit_global->discovery_tpg)
610 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
611 target_unregister_template(&iscsi_ops);
612 out:
613 kfree(iscsit_global);
614 return -ENOMEM;
615 }
616
iscsi_target_cleanup_module(void)617 static void __exit iscsi_target_cleanup_module(void)
618 {
619 iscsit_release_discovery_tpg();
620 iscsit_unregister_transport(&iscsi_target_transport);
621 kmem_cache_destroy(lio_qr_cache);
622 kmem_cache_destroy(lio_dr_cache);
623 kmem_cache_destroy(lio_ooo_cache);
624 kmem_cache_destroy(lio_r2t_cache);
625
626 /*
627 * Shutdown discovery sessions and disable discovery TPG
628 */
629 if (iscsit_global->discovery_tpg)
630 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
631
632 target_unregister_template(&iscsi_ops);
633
634 vfree(iscsit_global->ts_bitmap);
635 kfree(iscsit_global);
636 }
637
iscsit_add_reject(struct iscsi_conn * conn,u8 reason,unsigned char * buf)638 static int iscsit_add_reject(
639 struct iscsi_conn *conn,
640 u8 reason,
641 unsigned char *buf)
642 {
643 struct iscsi_cmd *cmd;
644
645 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
646 if (!cmd)
647 return -1;
648
649 cmd->iscsi_opcode = ISCSI_OP_REJECT;
650 cmd->reject_reason = reason;
651
652 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
653 if (!cmd->buf_ptr) {
654 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
655 iscsit_free_cmd(cmd, false);
656 return -1;
657 }
658
659 spin_lock_bh(&conn->cmd_lock);
660 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
661 spin_unlock_bh(&conn->cmd_lock);
662
663 cmd->i_state = ISTATE_SEND_REJECT;
664 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
665
666 return -1;
667 }
668
iscsit_add_reject_from_cmd(struct iscsi_cmd * cmd,u8 reason,bool add_to_conn,unsigned char * buf)669 static int iscsit_add_reject_from_cmd(
670 struct iscsi_cmd *cmd,
671 u8 reason,
672 bool add_to_conn,
673 unsigned char *buf)
674 {
675 struct iscsi_conn *conn;
676 const bool do_put = cmd->se_cmd.se_tfo != NULL;
677
678 if (!cmd->conn) {
679 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
680 cmd->init_task_tag);
681 return -1;
682 }
683 conn = cmd->conn;
684
685 cmd->iscsi_opcode = ISCSI_OP_REJECT;
686 cmd->reject_reason = reason;
687
688 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
689 if (!cmd->buf_ptr) {
690 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
691 iscsit_free_cmd(cmd, false);
692 return -1;
693 }
694
695 if (add_to_conn) {
696 spin_lock_bh(&conn->cmd_lock);
697 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
698 spin_unlock_bh(&conn->cmd_lock);
699 }
700
701 cmd->i_state = ISTATE_SEND_REJECT;
702 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
703 /*
704 * Perform the kref_put now if se_cmd has already been setup by
705 * scsit_setup_scsi_cmd()
706 */
707 if (do_put) {
708 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
709 target_put_sess_cmd(&cmd->se_cmd);
710 }
711 return -1;
712 }
713
iscsit_add_reject_cmd(struct iscsi_cmd * cmd,u8 reason,unsigned char * buf)714 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
715 unsigned char *buf)
716 {
717 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
718 }
719
iscsit_reject_cmd(struct iscsi_cmd * cmd,u8 reason,unsigned char * buf)720 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
721 {
722 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
723 }
724
725 /*
726 * Map some portion of the allocated scatterlist to an iovec, suitable for
727 * kernel sockets to copy data in/out.
728 */
iscsit_map_iovec(struct iscsi_cmd * cmd,struct kvec * iov,u32 data_offset,u32 data_length)729 static int iscsit_map_iovec(
730 struct iscsi_cmd *cmd,
731 struct kvec *iov,
732 u32 data_offset,
733 u32 data_length)
734 {
735 u32 i = 0;
736 struct scatterlist *sg;
737 unsigned int page_off;
738
739 /*
740 * We know each entry in t_data_sg contains a page.
741 */
742 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
743 page_off = (data_offset % PAGE_SIZE);
744
745 cmd->first_data_sg = sg;
746 cmd->first_data_sg_off = page_off;
747
748 while (data_length) {
749 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
750
751 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
752 iov[i].iov_len = cur_len;
753
754 data_length -= cur_len;
755 page_off = 0;
756 sg = sg_next(sg);
757 i++;
758 }
759
760 cmd->kmapped_nents = i;
761
762 return i;
763 }
764
iscsit_unmap_iovec(struct iscsi_cmd * cmd)765 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
766 {
767 u32 i;
768 struct scatterlist *sg;
769
770 sg = cmd->first_data_sg;
771
772 for (i = 0; i < cmd->kmapped_nents; i++)
773 kunmap(sg_page(&sg[i]));
774 }
775
iscsit_ack_from_expstatsn(struct iscsi_conn * conn,u32 exp_statsn)776 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
777 {
778 LIST_HEAD(ack_list);
779 struct iscsi_cmd *cmd, *cmd_p;
780
781 conn->exp_statsn = exp_statsn;
782
783 if (conn->sess->sess_ops->RDMAExtensions)
784 return;
785
786 spin_lock_bh(&conn->cmd_lock);
787 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
788 spin_lock(&cmd->istate_lock);
789 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
790 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
791 cmd->i_state = ISTATE_REMOVE;
792 spin_unlock(&cmd->istate_lock);
793 list_move_tail(&cmd->i_conn_node, &ack_list);
794 continue;
795 }
796 spin_unlock(&cmd->istate_lock);
797 }
798 spin_unlock_bh(&conn->cmd_lock);
799
800 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
801 list_del_init(&cmd->i_conn_node);
802 iscsit_free_cmd(cmd, false);
803 }
804 }
805
iscsit_allocate_iovecs(struct iscsi_cmd * cmd)806 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
807 {
808 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
809
810 iov_count += ISCSI_IOV_DATA_BUFFER;
811
812 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
813 if (!cmd->iov_data) {
814 pr_err("Unable to allocate cmd->iov_data\n");
815 return -ENOMEM;
816 }
817
818 cmd->orig_iov_data_count = iov_count;
819 return 0;
820 }
821
iscsit_setup_scsi_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)822 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
823 unsigned char *buf)
824 {
825 int data_direction, payload_length;
826 struct iscsi_scsi_req *hdr;
827 int iscsi_task_attr;
828 int sam_task_attr;
829
830 atomic_long_inc(&conn->sess->cmd_pdus);
831
832 hdr = (struct iscsi_scsi_req *) buf;
833 payload_length = ntoh24(hdr->dlength);
834
835 /* FIXME; Add checks for AdditionalHeaderSegment */
836
837 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
838 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
839 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
840 " not set. Bad iSCSI Initiator.\n");
841 return iscsit_add_reject_cmd(cmd,
842 ISCSI_REASON_BOOKMARK_INVALID, buf);
843 }
844
845 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
846 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
847 /*
848 * From RFC-3720 Section 10.3.1:
849 *
850 * "Either or both of R and W MAY be 1 when either the
851 * Expected Data Transfer Length and/or Bidirectional Read
852 * Expected Data Transfer Length are 0"
853 *
854 * For this case, go ahead and clear the unnecssary bits
855 * to avoid any confusion with ->data_direction.
856 */
857 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
858 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
859
860 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
861 " set when Expected Data Transfer Length is 0 for"
862 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
863 }
864
865 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
866 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
867 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
868 " MUST be set if Expected Data Transfer Length is not 0."
869 " Bad iSCSI Initiator\n");
870 return iscsit_add_reject_cmd(cmd,
871 ISCSI_REASON_BOOKMARK_INVALID, buf);
872 }
873
874 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
875 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
876 pr_err("Bidirectional operations not supported!\n");
877 return iscsit_add_reject_cmd(cmd,
878 ISCSI_REASON_BOOKMARK_INVALID, buf);
879 }
880
881 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
882 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
883 " Scsi Command PDU.\n");
884 return iscsit_add_reject_cmd(cmd,
885 ISCSI_REASON_BOOKMARK_INVALID, buf);
886 }
887
888 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
889 pr_err("ImmediateData=No but DataSegmentLength=%u,"
890 " protocol error.\n", payload_length);
891 return iscsit_add_reject_cmd(cmd,
892 ISCSI_REASON_PROTOCOL_ERROR, buf);
893 }
894
895 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
896 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
897 pr_err("Expected Data Transfer Length and Length of"
898 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
899 " bit is not set protocol error\n");
900 return iscsit_add_reject_cmd(cmd,
901 ISCSI_REASON_PROTOCOL_ERROR, buf);
902 }
903
904 if (payload_length > be32_to_cpu(hdr->data_length)) {
905 pr_err("DataSegmentLength: %u is greater than"
906 " EDTL: %u, protocol error.\n", payload_length,
907 hdr->data_length);
908 return iscsit_add_reject_cmd(cmd,
909 ISCSI_REASON_PROTOCOL_ERROR, buf);
910 }
911
912 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
913 pr_err("DataSegmentLength: %u is greater than"
914 " MaxXmitDataSegmentLength: %u, protocol error.\n",
915 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
916 return iscsit_add_reject_cmd(cmd,
917 ISCSI_REASON_PROTOCOL_ERROR, buf);
918 }
919
920 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
921 pr_err("DataSegmentLength: %u is greater than"
922 " FirstBurstLength: %u, protocol error.\n",
923 payload_length, conn->sess->sess_ops->FirstBurstLength);
924 return iscsit_add_reject_cmd(cmd,
925 ISCSI_REASON_BOOKMARK_INVALID, buf);
926 }
927
928 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
929 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
930 DMA_NONE;
931
932 cmd->data_direction = data_direction;
933 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
934 /*
935 * Figure out the SAM Task Attribute for the incoming SCSI CDB
936 */
937 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
938 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
939 sam_task_attr = TCM_SIMPLE_TAG;
940 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
941 sam_task_attr = TCM_ORDERED_TAG;
942 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
943 sam_task_attr = TCM_HEAD_TAG;
944 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
945 sam_task_attr = TCM_ACA_TAG;
946 else {
947 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
948 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
949 sam_task_attr = TCM_SIMPLE_TAG;
950 }
951
952 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
953 cmd->i_state = ISTATE_NEW_CMD;
954 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
955 cmd->immediate_data = (payload_length) ? 1 : 0;
956 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
957 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
958 if (cmd->unsolicited_data)
959 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
960
961 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
962 if (hdr->flags & ISCSI_FLAG_CMD_READ)
963 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
964 else
965 cmd->targ_xfer_tag = 0xFFFFFFFF;
966 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
967 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
968 cmd->first_burst_len = payload_length;
969
970 if (!conn->sess->sess_ops->RDMAExtensions &&
971 cmd->data_direction == DMA_FROM_DEVICE) {
972 struct iscsi_datain_req *dr;
973
974 dr = iscsit_allocate_datain_req();
975 if (!dr)
976 return iscsit_add_reject_cmd(cmd,
977 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
978
979 iscsit_attach_datain_req(cmd, dr);
980 }
981
982 /*
983 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
984 */
985 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
986 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
987 cmd->data_direction, sam_task_attr,
988 cmd->sense_buffer + 2);
989
990 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
991 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
992 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
993 conn->cid);
994
995 target_get_sess_cmd(&cmd->se_cmd, true);
996
997 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
998 scsilun_to_int(&hdr->lun));
999 if (cmd->sense_reason)
1000 goto attach_cmd;
1001
1002 /* only used for printks or comparing with ->ref_task_tag */
1003 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1004 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1005 if (cmd->sense_reason) {
1006 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1007 return iscsit_add_reject_cmd(cmd,
1008 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1009 }
1010
1011 goto attach_cmd;
1012 }
1013
1014 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1015 return iscsit_add_reject_cmd(cmd,
1016 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1017 }
1018
1019 attach_cmd:
1020 spin_lock_bh(&conn->cmd_lock);
1021 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1022 spin_unlock_bh(&conn->cmd_lock);
1023 /*
1024 * Check if we need to delay processing because of ALUA
1025 * Active/NonOptimized primary access state..
1026 */
1027 core_alua_check_nonop_delay(&cmd->se_cmd);
1028
1029 return 0;
1030 }
1031 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1032
iscsit_set_unsoliticed_dataout(struct iscsi_cmd * cmd)1033 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1034 {
1035 iscsit_set_dataout_sequence_values(cmd);
1036
1037 spin_lock_bh(&cmd->dataout_timeout_lock);
1038 iscsit_start_dataout_timer(cmd, cmd->conn);
1039 spin_unlock_bh(&cmd->dataout_timeout_lock);
1040 }
1041 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1042
iscsit_process_scsi_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_scsi_req * hdr)1043 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1044 struct iscsi_scsi_req *hdr)
1045 {
1046 int cmdsn_ret = 0;
1047 /*
1048 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1049 * the Immediate Bit is not set, and no Immediate
1050 * Data is attached.
1051 *
1052 * A PDU/CmdSN carrying Immediate Data can only
1053 * be processed after the DataCRC has passed.
1054 * If the DataCRC fails, the CmdSN MUST NOT
1055 * be acknowledged. (See below)
1056 */
1057 if (!cmd->immediate_data) {
1058 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1059 (unsigned char *)hdr, hdr->cmdsn);
1060 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1061 return -1;
1062 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1063 target_put_sess_cmd(&cmd->se_cmd);
1064 return 0;
1065 }
1066 }
1067
1068 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1069
1070 /*
1071 * If no Immediate Data is attached, it's OK to return now.
1072 */
1073 if (!cmd->immediate_data) {
1074 if (!cmd->sense_reason && cmd->unsolicited_data)
1075 iscsit_set_unsoliticed_dataout(cmd);
1076 if (!cmd->sense_reason)
1077 return 0;
1078
1079 target_put_sess_cmd(&cmd->se_cmd);
1080 return 0;
1081 }
1082
1083 /*
1084 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1085 * execution. These exceptions are processed in CmdSN order using
1086 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1087 */
1088 if (cmd->sense_reason) {
1089 if (cmd->reject_reason)
1090 return 0;
1091
1092 return 1;
1093 }
1094 /*
1095 * Call directly into transport_generic_new_cmd() to perform
1096 * the backend memory allocation.
1097 */
1098 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1099 if (cmd->sense_reason)
1100 return 1;
1101
1102 return 0;
1103 }
1104 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1105
1106 static int
iscsit_get_immediate_data(struct iscsi_cmd * cmd,struct iscsi_scsi_req * hdr,bool dump_payload)1107 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1108 bool dump_payload)
1109 {
1110 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1111 /*
1112 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1113 */
1114 if (dump_payload)
1115 goto after_immediate_data;
1116 /*
1117 * Check for underflow case where both EDTL and immediate data payload
1118 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1119 * already been set in target_cmd_size_check() as se_cmd->data_length.
1120 *
1121 * For this special case, fail the command and dump the immediate data
1122 * payload.
1123 */
1124 if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1125 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1126 goto after_immediate_data;
1127 }
1128
1129 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1130 cmd->first_burst_len);
1131 after_immediate_data:
1132 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1133 /*
1134 * A PDU/CmdSN carrying Immediate Data passed
1135 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1136 * Immediate Bit is not set.
1137 */
1138 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1139 (unsigned char *)hdr, hdr->cmdsn);
1140 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1141 return -1;
1142
1143 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1144 int rc;
1145
1146 rc = iscsit_dump_data_payload(cmd->conn,
1147 cmd->first_burst_len, 1);
1148 target_put_sess_cmd(&cmd->se_cmd);
1149 return rc;
1150 } else if (cmd->unsolicited_data)
1151 iscsit_set_unsoliticed_dataout(cmd);
1152
1153 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1154 /*
1155 * Immediate Data failed DataCRC and ERL>=1,
1156 * silently drop this PDU and let the initiator
1157 * plug the CmdSN gap.
1158 *
1159 * FIXME: Send Unsolicited NOPIN with reserved
1160 * TTT here to help the initiator figure out
1161 * the missing CmdSN, although they should be
1162 * intelligent enough to determine the missing
1163 * CmdSN and issue a retry to plug the sequence.
1164 */
1165 cmd->i_state = ISTATE_REMOVE;
1166 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1167 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1168 return -1;
1169
1170 return 0;
1171 }
1172
1173 static int
iscsit_handle_scsi_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)1174 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1175 unsigned char *buf)
1176 {
1177 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1178 int rc, immed_data;
1179 bool dump_payload = false;
1180
1181 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1182 if (rc < 0)
1183 return 0;
1184 /*
1185 * Allocation iovecs needed for struct socket operations for
1186 * traditional iSCSI block I/O.
1187 */
1188 if (iscsit_allocate_iovecs(cmd) < 0) {
1189 return iscsit_reject_cmd(cmd,
1190 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1191 }
1192 immed_data = cmd->immediate_data;
1193
1194 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1195 if (rc < 0)
1196 return rc;
1197 else if (rc > 0)
1198 dump_payload = true;
1199
1200 if (!immed_data)
1201 return 0;
1202
1203 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1204 }
1205
iscsit_do_crypto_hash_sg(struct hash_desc * hash,struct iscsi_cmd * cmd,u32 data_offset,u32 data_length,u32 padding,u8 * pad_bytes)1206 static u32 iscsit_do_crypto_hash_sg(
1207 struct hash_desc *hash,
1208 struct iscsi_cmd *cmd,
1209 u32 data_offset,
1210 u32 data_length,
1211 u32 padding,
1212 u8 *pad_bytes)
1213 {
1214 u32 data_crc;
1215 struct scatterlist *sg;
1216 unsigned int page_off;
1217
1218 crypto_hash_init(hash);
1219
1220 sg = cmd->first_data_sg;
1221 page_off = cmd->first_data_sg_off;
1222
1223 while (data_length) {
1224 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1225
1226 crypto_hash_update(hash, sg, cur_len);
1227
1228 data_length -= cur_len;
1229 page_off = 0;
1230 /* iscsit_map_iovec has already checked for invalid sg pointers */
1231 sg = sg_next(sg);
1232 }
1233
1234 if (padding) {
1235 struct scatterlist pad_sg;
1236
1237 sg_init_one(&pad_sg, pad_bytes, padding);
1238 crypto_hash_update(hash, &pad_sg, padding);
1239 }
1240 crypto_hash_final(hash, (u8 *) &data_crc);
1241
1242 return data_crc;
1243 }
1244
iscsit_do_crypto_hash_buf(struct hash_desc * hash,const void * buf,u32 payload_length,u32 padding,u8 * pad_bytes,u8 * data_crc)1245 static void iscsit_do_crypto_hash_buf(
1246 struct hash_desc *hash,
1247 const void *buf,
1248 u32 payload_length,
1249 u32 padding,
1250 u8 *pad_bytes,
1251 u8 *data_crc)
1252 {
1253 struct scatterlist sg;
1254
1255 crypto_hash_init(hash);
1256
1257 sg_init_one(&sg, buf, payload_length);
1258 crypto_hash_update(hash, &sg, payload_length);
1259
1260 if (padding) {
1261 sg_init_one(&sg, pad_bytes, padding);
1262 crypto_hash_update(hash, &sg, padding);
1263 }
1264 crypto_hash_final(hash, data_crc);
1265 }
1266
1267 int
iscsit_check_dataout_hdr(struct iscsi_conn * conn,unsigned char * buf,struct iscsi_cmd ** out_cmd)1268 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1269 struct iscsi_cmd **out_cmd)
1270 {
1271 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1272 struct iscsi_cmd *cmd = NULL;
1273 struct se_cmd *se_cmd;
1274 u32 payload_length = ntoh24(hdr->dlength);
1275 int rc;
1276
1277 if (!payload_length) {
1278 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1279 return 0;
1280 }
1281
1282 /* iSCSI write */
1283 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1284
1285 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1286 pr_err("DataSegmentLength: %u is greater than"
1287 " MaxXmitDataSegmentLength: %u\n", payload_length,
1288 conn->conn_ops->MaxXmitDataSegmentLength);
1289 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1290 buf);
1291 }
1292
1293 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1294 payload_length);
1295 if (!cmd)
1296 return 0;
1297
1298 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1299 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1300 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1301 payload_length, conn->cid);
1302
1303 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1304 pr_err("Command ITT: 0x%08x received DataOUT after"
1305 " last DataOUT received, dumping payload\n",
1306 cmd->init_task_tag);
1307 return iscsit_dump_data_payload(conn, payload_length, 1);
1308 }
1309
1310 if (cmd->data_direction != DMA_TO_DEVICE) {
1311 pr_err("Command ITT: 0x%08x received DataOUT for a"
1312 " NON-WRITE command.\n", cmd->init_task_tag);
1313 return iscsit_dump_data_payload(conn, payload_length, 1);
1314 }
1315 se_cmd = &cmd->se_cmd;
1316 iscsit_mod_dataout_timer(cmd);
1317
1318 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1319 pr_err("DataOut Offset: %u, Length %u greater than"
1320 " iSCSI Command EDTL %u, protocol error.\n",
1321 hdr->offset, payload_length, cmd->se_cmd.data_length);
1322 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1323 }
1324
1325 if (cmd->unsolicited_data) {
1326 int dump_unsolicited_data = 0;
1327
1328 if (conn->sess->sess_ops->InitialR2T) {
1329 pr_err("Received unexpected unsolicited data"
1330 " while InitialR2T=Yes, protocol error.\n");
1331 transport_send_check_condition_and_sense(&cmd->se_cmd,
1332 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1333 return -1;
1334 }
1335 /*
1336 * Special case for dealing with Unsolicited DataOUT
1337 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1338 * failures;
1339 */
1340
1341 /* Something's amiss if we're not in WRITE_PENDING state... */
1342 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1343 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1344 dump_unsolicited_data = 1;
1345
1346 if (dump_unsolicited_data) {
1347 /*
1348 * Check if a delayed TASK_ABORTED status needs to
1349 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1350 * received with the unsolicitied data out.
1351 */
1352 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1353 iscsit_stop_dataout_timer(cmd);
1354
1355 transport_check_aborted_status(se_cmd,
1356 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1357 return iscsit_dump_data_payload(conn, payload_length, 1);
1358 }
1359 } else {
1360 /*
1361 * For the normal solicited data path:
1362 *
1363 * Check for a delayed TASK_ABORTED status and dump any
1364 * incoming data out payload if one exists. Also, when the
1365 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1366 * data out sequence, we decrement outstanding_r2ts. Once
1367 * outstanding_r2ts reaches zero, go ahead and send the delayed
1368 * TASK_ABORTED status.
1369 */
1370 if (se_cmd->transport_state & CMD_T_ABORTED) {
1371 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1372 if (--cmd->outstanding_r2ts < 1) {
1373 iscsit_stop_dataout_timer(cmd);
1374 transport_check_aborted_status(
1375 se_cmd, 1);
1376 }
1377
1378 return iscsit_dump_data_payload(conn, payload_length, 1);
1379 }
1380 }
1381 /*
1382 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1383 * within-command recovery checks before receiving the payload.
1384 */
1385 rc = iscsit_check_pre_dataout(cmd, buf);
1386 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1387 return 0;
1388 else if (rc == DATAOUT_CANNOT_RECOVER)
1389 return -1;
1390
1391 *out_cmd = cmd;
1392 return 0;
1393 }
1394 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1395
1396 static int
iscsit_get_dataout(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_data * hdr)1397 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1398 struct iscsi_data *hdr)
1399 {
1400 struct kvec *iov;
1401 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1402 u32 payload_length = ntoh24(hdr->dlength);
1403 int iov_ret, data_crc_failed = 0;
1404
1405 rx_size += payload_length;
1406 iov = &cmd->iov_data[0];
1407
1408 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1409 payload_length);
1410 if (iov_ret < 0)
1411 return -1;
1412
1413 iov_count += iov_ret;
1414
1415 padding = ((-payload_length) & 3);
1416 if (padding != 0) {
1417 iov[iov_count].iov_base = cmd->pad_bytes;
1418 iov[iov_count++].iov_len = padding;
1419 rx_size += padding;
1420 pr_debug("Receiving %u padding bytes.\n", padding);
1421 }
1422
1423 if (conn->conn_ops->DataDigest) {
1424 iov[iov_count].iov_base = &checksum;
1425 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1426 rx_size += ISCSI_CRC_LEN;
1427 }
1428
1429 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1430
1431 iscsit_unmap_iovec(cmd);
1432
1433 if (rx_got != rx_size)
1434 return -1;
1435
1436 if (conn->conn_ops->DataDigest) {
1437 u32 data_crc;
1438
1439 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1440 be32_to_cpu(hdr->offset),
1441 payload_length, padding,
1442 cmd->pad_bytes);
1443
1444 if (checksum != data_crc) {
1445 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1446 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1447 " does not match computed 0x%08x\n",
1448 hdr->itt, hdr->offset, payload_length,
1449 hdr->datasn, checksum, data_crc);
1450 data_crc_failed = 1;
1451 } else {
1452 pr_debug("Got CRC32C DataDigest 0x%08x for"
1453 " %u bytes of Data Out\n", checksum,
1454 payload_length);
1455 }
1456 }
1457
1458 return data_crc_failed;
1459 }
1460
1461 int
iscsit_check_dataout_payload(struct iscsi_cmd * cmd,struct iscsi_data * hdr,bool data_crc_failed)1462 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1463 bool data_crc_failed)
1464 {
1465 struct iscsi_conn *conn = cmd->conn;
1466 int rc, ooo_cmdsn;
1467 /*
1468 * Increment post receive data and CRC values or perform
1469 * within-command recovery.
1470 */
1471 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1472 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1473 return 0;
1474 else if (rc == DATAOUT_SEND_R2T) {
1475 iscsit_set_dataout_sequence_values(cmd);
1476 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1477 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1478 /*
1479 * Handle extra special case for out of order
1480 * Unsolicited Data Out.
1481 */
1482 spin_lock_bh(&cmd->istate_lock);
1483 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1484 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1485 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1486 spin_unlock_bh(&cmd->istate_lock);
1487
1488 iscsit_stop_dataout_timer(cmd);
1489 if (ooo_cmdsn)
1490 return 0;
1491 target_execute_cmd(&cmd->se_cmd);
1492 return 0;
1493 } else /* DATAOUT_CANNOT_RECOVER */
1494 return -1;
1495
1496 return 0;
1497 }
1498 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1499
iscsit_handle_data_out(struct iscsi_conn * conn,unsigned char * buf)1500 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1501 {
1502 struct iscsi_cmd *cmd = NULL;
1503 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1504 int rc;
1505 bool data_crc_failed = false;
1506
1507 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1508 if (rc < 0)
1509 return 0;
1510 else if (!cmd)
1511 return 0;
1512
1513 rc = iscsit_get_dataout(conn, cmd, hdr);
1514 if (rc < 0)
1515 return rc;
1516 else if (rc > 0)
1517 data_crc_failed = true;
1518
1519 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1520 }
1521
iscsit_setup_nop_out(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_nopout * hdr)1522 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1523 struct iscsi_nopout *hdr)
1524 {
1525 u32 payload_length = ntoh24(hdr->dlength);
1526
1527 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1528 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1529 if (!cmd)
1530 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1531 (unsigned char *)hdr);
1532
1533 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1534 (unsigned char *)hdr);
1535 }
1536
1537 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1538 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1539 " not set, protocol error.\n");
1540 if (!cmd)
1541 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1542 (unsigned char *)hdr);
1543
1544 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1545 (unsigned char *)hdr);
1546 }
1547
1548 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1549 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1550 " greater than MaxXmitDataSegmentLength: %u, protocol"
1551 " error.\n", payload_length,
1552 conn->conn_ops->MaxXmitDataSegmentLength);
1553 if (!cmd)
1554 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1555 (unsigned char *)hdr);
1556
1557 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1558 (unsigned char *)hdr);
1559 }
1560
1561 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1562 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1563 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1564 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1565 payload_length);
1566 /*
1567 * This is not a response to a Unsolicited NopIN, which means
1568 * it can either be a NOPOUT ping request (with a valid ITT),
1569 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1570 * Either way, make sure we allocate an struct iscsi_cmd, as both
1571 * can contain ping data.
1572 */
1573 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1574 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1575 cmd->i_state = ISTATE_SEND_NOPIN;
1576 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1577 1 : 0);
1578 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1579 cmd->targ_xfer_tag = 0xFFFFFFFF;
1580 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1581 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1582 cmd->data_direction = DMA_NONE;
1583 }
1584
1585 return 0;
1586 }
1587 EXPORT_SYMBOL(iscsit_setup_nop_out);
1588
iscsit_process_nop_out(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_nopout * hdr)1589 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1590 struct iscsi_nopout *hdr)
1591 {
1592 struct iscsi_cmd *cmd_p = NULL;
1593 int cmdsn_ret = 0;
1594 /*
1595 * Initiator is expecting a NopIN ping reply..
1596 */
1597 if (hdr->itt != RESERVED_ITT) {
1598 if (!cmd)
1599 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1600 (unsigned char *)hdr);
1601
1602 spin_lock_bh(&conn->cmd_lock);
1603 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1604 spin_unlock_bh(&conn->cmd_lock);
1605
1606 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1607
1608 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1609 iscsit_add_cmd_to_response_queue(cmd, conn,
1610 cmd->i_state);
1611 return 0;
1612 }
1613
1614 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1615 (unsigned char *)hdr, hdr->cmdsn);
1616 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1617 return 0;
1618 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1619 return -1;
1620
1621 return 0;
1622 }
1623 /*
1624 * This was a response to a unsolicited NOPIN ping.
1625 */
1626 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1627 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1628 if (!cmd_p)
1629 return -EINVAL;
1630
1631 iscsit_stop_nopin_response_timer(conn);
1632
1633 cmd_p->i_state = ISTATE_REMOVE;
1634 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1635
1636 iscsit_start_nopin_timer(conn);
1637 return 0;
1638 }
1639 /*
1640 * Otherwise, initiator is not expecting a NOPIN is response.
1641 * Just ignore for now.
1642 */
1643 return 0;
1644 }
1645 EXPORT_SYMBOL(iscsit_process_nop_out);
1646
iscsit_handle_nop_out(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)1647 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1648 unsigned char *buf)
1649 {
1650 unsigned char *ping_data = NULL;
1651 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1652 struct kvec *iov = NULL;
1653 u32 payload_length = ntoh24(hdr->dlength);
1654 int ret;
1655
1656 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1657 if (ret < 0)
1658 return 0;
1659 /*
1660 * Handle NOP-OUT payload for traditional iSCSI sockets
1661 */
1662 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1663 u32 checksum, data_crc, padding = 0;
1664 int niov = 0, rx_got, rx_size = payload_length;
1665
1666 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1667 if (!ping_data) {
1668 pr_err("Unable to allocate memory for"
1669 " NOPOUT ping data.\n");
1670 ret = -1;
1671 goto out;
1672 }
1673
1674 iov = &cmd->iov_misc[0];
1675 iov[niov].iov_base = ping_data;
1676 iov[niov++].iov_len = payload_length;
1677
1678 padding = ((-payload_length) & 3);
1679 if (padding != 0) {
1680 pr_debug("Receiving %u additional bytes"
1681 " for padding.\n", padding);
1682 iov[niov].iov_base = &cmd->pad_bytes;
1683 iov[niov++].iov_len = padding;
1684 rx_size += padding;
1685 }
1686 if (conn->conn_ops->DataDigest) {
1687 iov[niov].iov_base = &checksum;
1688 iov[niov++].iov_len = ISCSI_CRC_LEN;
1689 rx_size += ISCSI_CRC_LEN;
1690 }
1691
1692 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1693 if (rx_got != rx_size) {
1694 ret = -1;
1695 goto out;
1696 }
1697
1698 if (conn->conn_ops->DataDigest) {
1699 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1700 ping_data, payload_length,
1701 padding, cmd->pad_bytes,
1702 (u8 *)&data_crc);
1703
1704 if (checksum != data_crc) {
1705 pr_err("Ping data CRC32C DataDigest"
1706 " 0x%08x does not match computed 0x%08x\n",
1707 checksum, data_crc);
1708 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1709 pr_err("Unable to recover from"
1710 " NOPOUT Ping DataCRC failure while in"
1711 " ERL=0.\n");
1712 ret = -1;
1713 goto out;
1714 } else {
1715 /*
1716 * Silently drop this PDU and let the
1717 * initiator plug the CmdSN gap.
1718 */
1719 pr_debug("Dropping NOPOUT"
1720 " Command CmdSN: 0x%08x due to"
1721 " DataCRC error.\n", hdr->cmdsn);
1722 ret = 0;
1723 goto out;
1724 }
1725 } else {
1726 pr_debug("Got CRC32C DataDigest"
1727 " 0x%08x for %u bytes of ping data.\n",
1728 checksum, payload_length);
1729 }
1730 }
1731
1732 ping_data[payload_length] = '\0';
1733 /*
1734 * Attach ping data to struct iscsi_cmd->buf_ptr.
1735 */
1736 cmd->buf_ptr = ping_data;
1737 cmd->buf_ptr_size = payload_length;
1738
1739 pr_debug("Got %u bytes of NOPOUT ping"
1740 " data.\n", payload_length);
1741 pr_debug("Ping Data: \"%s\"\n", ping_data);
1742 }
1743
1744 return iscsit_process_nop_out(conn, cmd, hdr);
1745 out:
1746 if (cmd)
1747 iscsit_free_cmd(cmd, false);
1748
1749 kfree(ping_data);
1750 return ret;
1751 }
1752
1753 int
iscsit_handle_task_mgt_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)1754 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1755 unsigned char *buf)
1756 {
1757 struct se_tmr_req *se_tmr;
1758 struct iscsi_tmr_req *tmr_req;
1759 struct iscsi_tm *hdr;
1760 int out_of_order_cmdsn = 0, ret;
1761 u8 function, tcm_function = TMR_UNKNOWN;
1762
1763 hdr = (struct iscsi_tm *) buf;
1764 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1765 function = hdr->flags;
1766
1767 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1768 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1769 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1770 hdr->rtt, hdr->refcmdsn, conn->cid);
1771
1772 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1773 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1774 hdr->rtt != RESERVED_ITT)) {
1775 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1776 hdr->rtt = RESERVED_ITT;
1777 }
1778
1779 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1780 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1781 pr_err("Task Management Request TASK_REASSIGN not"
1782 " issued as immediate command, bad iSCSI Initiator"
1783 "implementation\n");
1784 return iscsit_add_reject_cmd(cmd,
1785 ISCSI_REASON_PROTOCOL_ERROR, buf);
1786 }
1787 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1788 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1789 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1790
1791 cmd->data_direction = DMA_NONE;
1792
1793 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1794 if (!cmd->tmr_req) {
1795 pr_err("Unable to allocate memory for"
1796 " Task Management command!\n");
1797 return iscsit_add_reject_cmd(cmd,
1798 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1799 buf);
1800 }
1801
1802 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1803 conn->sess->se_sess, 0, DMA_NONE,
1804 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1805
1806 target_get_sess_cmd(&cmd->se_cmd, true);
1807
1808 /*
1809 * TASK_REASSIGN for ERL=2 / connection stays inside of
1810 * LIO-Target $FABRIC_MOD
1811 */
1812 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1813 switch (function) {
1814 case ISCSI_TM_FUNC_ABORT_TASK:
1815 tcm_function = TMR_ABORT_TASK;
1816 break;
1817 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1818 tcm_function = TMR_ABORT_TASK_SET;
1819 break;
1820 case ISCSI_TM_FUNC_CLEAR_ACA:
1821 tcm_function = TMR_CLEAR_ACA;
1822 break;
1823 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1824 tcm_function = TMR_CLEAR_TASK_SET;
1825 break;
1826 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1827 tcm_function = TMR_LUN_RESET;
1828 break;
1829 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1830 tcm_function = TMR_TARGET_WARM_RESET;
1831 break;
1832 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1833 tcm_function = TMR_TARGET_COLD_RESET;
1834 break;
1835 default:
1836 pr_err("Unknown iSCSI TMR Function:"
1837 " 0x%02x\n", function);
1838 return iscsit_add_reject_cmd(cmd,
1839 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1840 }
1841 }
1842 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
1843 GFP_KERNEL);
1844 if (ret < 0)
1845 return iscsit_add_reject_cmd(cmd,
1846 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1847
1848 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1849
1850 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1851 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1852 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1853 cmd->init_task_tag = hdr->itt;
1854 cmd->targ_xfer_tag = 0xFFFFFFFF;
1855 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1856 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1857 se_tmr = cmd->se_cmd.se_tmr_req;
1858 tmr_req = cmd->tmr_req;
1859 /*
1860 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1861 */
1862 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1863 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1864 scsilun_to_int(&hdr->lun));
1865 if (ret < 0) {
1866 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1867 goto attach;
1868 }
1869 }
1870
1871 switch (function) {
1872 case ISCSI_TM_FUNC_ABORT_TASK:
1873 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1874 if (se_tmr->response)
1875 goto attach;
1876 break;
1877 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1878 case ISCSI_TM_FUNC_CLEAR_ACA:
1879 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1880 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1881 break;
1882 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1883 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1884 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1885 goto attach;
1886 }
1887 break;
1888 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1889 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1890 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1891 goto attach;
1892 }
1893 break;
1894 case ISCSI_TM_FUNC_TASK_REASSIGN:
1895 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1896 /*
1897 * Perform sanity checks on the ExpDataSN only if the
1898 * TASK_REASSIGN was successful.
1899 */
1900 if (se_tmr->response)
1901 break;
1902
1903 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1904 return iscsit_add_reject_cmd(cmd,
1905 ISCSI_REASON_BOOKMARK_INVALID, buf);
1906 break;
1907 default:
1908 pr_err("Unknown TMR function: 0x%02x, protocol"
1909 " error.\n", function);
1910 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1911 goto attach;
1912 }
1913
1914 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1915 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1916 se_tmr->call_transport = 1;
1917 attach:
1918 spin_lock_bh(&conn->cmd_lock);
1919 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1920 spin_unlock_bh(&conn->cmd_lock);
1921
1922 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1923 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1924 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
1925 out_of_order_cmdsn = 1;
1926 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1927 target_put_sess_cmd(&cmd->se_cmd);
1928 return 0;
1929 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
1930 return -1;
1931 }
1932 }
1933 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1934
1935 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1936 return 0;
1937 /*
1938 * Found the referenced task, send to transport for processing.
1939 */
1940 if (se_tmr->call_transport)
1941 return transport_generic_handle_tmr(&cmd->se_cmd);
1942
1943 /*
1944 * Could not find the referenced LUN, task, or Task Management
1945 * command not authorized or supported. Change state and
1946 * let the tx_thread send the response.
1947 *
1948 * For connection recovery, this is also the default action for
1949 * TMR TASK_REASSIGN.
1950 */
1951 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1952 target_put_sess_cmd(&cmd->se_cmd);
1953 return 0;
1954 }
1955 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1956
1957 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1958 int
iscsit_setup_text_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_text * hdr)1959 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1960 struct iscsi_text *hdr)
1961 {
1962 u32 payload_length = ntoh24(hdr->dlength);
1963
1964 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1965 pr_err("Unable to accept text parameter length: %u"
1966 "greater than MaxXmitDataSegmentLength %u.\n",
1967 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1968 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1969 (unsigned char *)hdr);
1970 }
1971
1972 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1973 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1974 pr_err("Multi sequence text commands currently not supported\n");
1975 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1976 (unsigned char *)hdr);
1977 }
1978
1979 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1980 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1981 hdr->exp_statsn, payload_length);
1982
1983 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1984 cmd->i_state = ISTATE_SEND_TEXTRSP;
1985 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1986 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1987 cmd->targ_xfer_tag = 0xFFFFFFFF;
1988 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1989 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1990 cmd->data_direction = DMA_NONE;
1991 kfree(cmd->text_in_ptr);
1992 cmd->text_in_ptr = NULL;
1993
1994 return 0;
1995 }
1996 EXPORT_SYMBOL(iscsit_setup_text_cmd);
1997
1998 int
iscsit_process_text_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_text * hdr)1999 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2000 struct iscsi_text *hdr)
2001 {
2002 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2003 int cmdsn_ret;
2004
2005 if (!text_in) {
2006 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2007 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2008 pr_err("Unable to locate text_in buffer for sendtargets"
2009 " discovery\n");
2010 goto reject;
2011 }
2012 goto empty_sendtargets;
2013 }
2014 if (strncmp("SendTargets", text_in, 11) != 0) {
2015 pr_err("Received Text Data that is not"
2016 " SendTargets, cannot continue.\n");
2017 goto reject;
2018 }
2019 text_ptr = strchr(text_in, '=');
2020 if (!text_ptr) {
2021 pr_err("No \"=\" separator found in Text Data,"
2022 " cannot continue.\n");
2023 goto reject;
2024 }
2025 if (!strncmp("=All", text_ptr, 4)) {
2026 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2027 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2028 !strncmp("=eui.", text_ptr, 5)) {
2029 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2030 } else {
2031 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2032 goto reject;
2033 }
2034
2035 spin_lock_bh(&conn->cmd_lock);
2036 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2037 spin_unlock_bh(&conn->cmd_lock);
2038
2039 empty_sendtargets:
2040 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2041
2042 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2043 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2044 (unsigned char *)hdr, hdr->cmdsn);
2045 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2046 return -1;
2047
2048 return 0;
2049 }
2050
2051 return iscsit_execute_cmd(cmd, 0);
2052
2053 reject:
2054 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2055 (unsigned char *)hdr);
2056 }
2057 EXPORT_SYMBOL(iscsit_process_text_cmd);
2058
2059 static int
iscsit_handle_text_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)2060 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2061 unsigned char *buf)
2062 {
2063 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2064 char *text_in = NULL;
2065 u32 payload_length = ntoh24(hdr->dlength);
2066 int rx_size, rc;
2067
2068 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2069 if (rc < 0)
2070 return 0;
2071
2072 rx_size = payload_length;
2073 if (payload_length) {
2074 u32 checksum = 0, data_crc = 0;
2075 u32 padding = 0, pad_bytes = 0;
2076 int niov = 0, rx_got;
2077 struct kvec iov[3];
2078
2079 text_in = kzalloc(payload_length, GFP_KERNEL);
2080 if (!text_in) {
2081 pr_err("Unable to allocate memory for"
2082 " incoming text parameters\n");
2083 goto reject;
2084 }
2085 cmd->text_in_ptr = text_in;
2086
2087 memset(iov, 0, 3 * sizeof(struct kvec));
2088 iov[niov].iov_base = text_in;
2089 iov[niov++].iov_len = payload_length;
2090
2091 padding = ((-payload_length) & 3);
2092 if (padding != 0) {
2093 iov[niov].iov_base = &pad_bytes;
2094 iov[niov++].iov_len = padding;
2095 rx_size += padding;
2096 pr_debug("Receiving %u additional bytes"
2097 " for padding.\n", padding);
2098 }
2099 if (conn->conn_ops->DataDigest) {
2100 iov[niov].iov_base = &checksum;
2101 iov[niov++].iov_len = ISCSI_CRC_LEN;
2102 rx_size += ISCSI_CRC_LEN;
2103 }
2104
2105 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2106 if (rx_got != rx_size)
2107 goto reject;
2108
2109 if (conn->conn_ops->DataDigest) {
2110 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2111 text_in, payload_length,
2112 padding, (u8 *)&pad_bytes,
2113 (u8 *)&data_crc);
2114
2115 if (checksum != data_crc) {
2116 pr_err("Text data CRC32C DataDigest"
2117 " 0x%08x does not match computed"
2118 " 0x%08x\n", checksum, data_crc);
2119 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2120 pr_err("Unable to recover from"
2121 " Text Data digest failure while in"
2122 " ERL=0.\n");
2123 goto reject;
2124 } else {
2125 /*
2126 * Silently drop this PDU and let the
2127 * initiator plug the CmdSN gap.
2128 */
2129 pr_debug("Dropping Text"
2130 " Command CmdSN: 0x%08x due to"
2131 " DataCRC error.\n", hdr->cmdsn);
2132 kfree(text_in);
2133 return 0;
2134 }
2135 } else {
2136 pr_debug("Got CRC32C DataDigest"
2137 " 0x%08x for %u bytes of text data.\n",
2138 checksum, payload_length);
2139 }
2140 }
2141 text_in[payload_length - 1] = '\0';
2142 pr_debug("Successfully read %d bytes of text"
2143 " data.\n", payload_length);
2144 }
2145
2146 return iscsit_process_text_cmd(conn, cmd, hdr);
2147
2148 reject:
2149 kfree(cmd->text_in_ptr);
2150 cmd->text_in_ptr = NULL;
2151 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2152 }
2153
iscsit_logout_closesession(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2154 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2155 {
2156 struct iscsi_conn *conn_p;
2157 struct iscsi_session *sess = conn->sess;
2158
2159 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2160 " for SID: %u.\n", conn->cid, conn->sess->sid);
2161
2162 atomic_set(&sess->session_logout, 1);
2163 atomic_set(&conn->conn_logout_remove, 1);
2164 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2165
2166 iscsit_inc_conn_usage_count(conn);
2167 iscsit_inc_session_usage_count(sess);
2168
2169 spin_lock_bh(&sess->conn_lock);
2170 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2171 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2172 continue;
2173
2174 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2175 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2176 }
2177 spin_unlock_bh(&sess->conn_lock);
2178
2179 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2180
2181 return 0;
2182 }
2183
iscsit_logout_closeconnection(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2184 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2185 {
2186 struct iscsi_conn *l_conn;
2187 struct iscsi_session *sess = conn->sess;
2188
2189 pr_debug("Received logout request CLOSECONNECTION for CID:"
2190 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2191
2192 /*
2193 * A Logout Request with a CLOSECONNECTION reason code for a CID
2194 * can arrive on a connection with a differing CID.
2195 */
2196 if (conn->cid == cmd->logout_cid) {
2197 spin_lock_bh(&conn->state_lock);
2198 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2199 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2200
2201 atomic_set(&conn->conn_logout_remove, 1);
2202 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2203 iscsit_inc_conn_usage_count(conn);
2204
2205 spin_unlock_bh(&conn->state_lock);
2206 } else {
2207 /*
2208 * Handle all different cid CLOSECONNECTION requests in
2209 * iscsit_logout_post_handler_diffcid() as to give enough
2210 * time for any non immediate command's CmdSN to be
2211 * acknowledged on the connection in question.
2212 *
2213 * Here we simply make sure the CID is still around.
2214 */
2215 l_conn = iscsit_get_conn_from_cid(sess,
2216 cmd->logout_cid);
2217 if (!l_conn) {
2218 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2219 iscsit_add_cmd_to_response_queue(cmd, conn,
2220 cmd->i_state);
2221 return 0;
2222 }
2223
2224 iscsit_dec_conn_usage_count(l_conn);
2225 }
2226
2227 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2228
2229 return 0;
2230 }
2231
iscsit_logout_removeconnforrecovery(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2232 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2233 {
2234 struct iscsi_session *sess = conn->sess;
2235
2236 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2237 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2238
2239 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2240 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2241 " while ERL!=2.\n");
2242 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2243 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2244 return 0;
2245 }
2246
2247 if (conn->cid == cmd->logout_cid) {
2248 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2249 " with CID: %hu on CID: %hu, implementation error.\n",
2250 cmd->logout_cid, conn->cid);
2251 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2252 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2253 return 0;
2254 }
2255
2256 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2257
2258 return 0;
2259 }
2260
2261 int
iscsit_handle_logout_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)2262 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2263 unsigned char *buf)
2264 {
2265 int cmdsn_ret, logout_remove = 0;
2266 u8 reason_code = 0;
2267 struct iscsi_logout *hdr;
2268 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2269
2270 hdr = (struct iscsi_logout *) buf;
2271 reason_code = (hdr->flags & 0x7f);
2272
2273 if (tiqn) {
2274 spin_lock(&tiqn->logout_stats.lock);
2275 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2276 tiqn->logout_stats.normal_logouts++;
2277 else
2278 tiqn->logout_stats.abnormal_logouts++;
2279 spin_unlock(&tiqn->logout_stats.lock);
2280 }
2281
2282 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2283 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2284 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2285 hdr->cid, conn->cid);
2286
2287 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2288 pr_err("Received logout request on connection that"
2289 " is not in logged in state, ignoring request.\n");
2290 iscsit_free_cmd(cmd, false);
2291 return 0;
2292 }
2293
2294 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2295 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2296 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2297 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2298 cmd->targ_xfer_tag = 0xFFFFFFFF;
2299 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2300 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2301 cmd->logout_cid = be16_to_cpu(hdr->cid);
2302 cmd->logout_reason = reason_code;
2303 cmd->data_direction = DMA_NONE;
2304
2305 /*
2306 * We need to sleep in these cases (by returning 1) until the Logout
2307 * Response gets sent in the tx thread.
2308 */
2309 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2310 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2311 be16_to_cpu(hdr->cid) == conn->cid))
2312 logout_remove = 1;
2313
2314 spin_lock_bh(&conn->cmd_lock);
2315 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2316 spin_unlock_bh(&conn->cmd_lock);
2317
2318 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2319 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2320
2321 /*
2322 * Immediate commands are executed, well, immediately.
2323 * Non-Immediate Logout Commands are executed in CmdSN order.
2324 */
2325 if (cmd->immediate_cmd) {
2326 int ret = iscsit_execute_cmd(cmd, 0);
2327
2328 if (ret < 0)
2329 return ret;
2330 } else {
2331 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2332 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2333 logout_remove = 0;
2334 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2335 return -1;
2336 }
2337
2338 return logout_remove;
2339 }
2340 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2341
iscsit_handle_snack(struct iscsi_conn * conn,unsigned char * buf)2342 static int iscsit_handle_snack(
2343 struct iscsi_conn *conn,
2344 unsigned char *buf)
2345 {
2346 struct iscsi_snack *hdr;
2347
2348 hdr = (struct iscsi_snack *) buf;
2349 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2350
2351 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2352 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2353 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2354 hdr->begrun, hdr->runlength, conn->cid);
2355
2356 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2357 pr_err("Initiator sent SNACK request while in"
2358 " ErrorRecoveryLevel=0.\n");
2359 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2360 buf);
2361 }
2362 /*
2363 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2364 * call from inside iscsi_send_recovery_datain_or_r2t().
2365 */
2366 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2367 case 0:
2368 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2369 hdr->itt,
2370 be32_to_cpu(hdr->ttt),
2371 be32_to_cpu(hdr->begrun),
2372 be32_to_cpu(hdr->runlength));
2373 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2374 return iscsit_handle_status_snack(conn, hdr->itt,
2375 be32_to_cpu(hdr->ttt),
2376 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2377 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2378 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2379 be32_to_cpu(hdr->begrun),
2380 be32_to_cpu(hdr->runlength));
2381 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2382 /* FIXME: Support R-Data SNACK */
2383 pr_err("R-Data SNACK Not Supported.\n");
2384 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2385 buf);
2386 default:
2387 pr_err("Unknown SNACK type 0x%02x, protocol"
2388 " error.\n", hdr->flags & 0x0f);
2389 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2390 buf);
2391 }
2392
2393 return 0;
2394 }
2395
iscsit_rx_thread_wait_for_tcp(struct iscsi_conn * conn)2396 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2397 {
2398 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2399 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2400 wait_for_completion_interruptible_timeout(
2401 &conn->rx_half_close_comp,
2402 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2403 }
2404 }
2405
iscsit_handle_immediate_data(struct iscsi_cmd * cmd,struct iscsi_scsi_req * hdr,u32 length)2406 static int iscsit_handle_immediate_data(
2407 struct iscsi_cmd *cmd,
2408 struct iscsi_scsi_req *hdr,
2409 u32 length)
2410 {
2411 int iov_ret, rx_got = 0, rx_size = 0;
2412 u32 checksum, iov_count = 0, padding = 0;
2413 struct iscsi_conn *conn = cmd->conn;
2414 struct kvec *iov;
2415
2416 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2417 if (iov_ret < 0)
2418 return IMMEDIATE_DATA_CANNOT_RECOVER;
2419
2420 rx_size = length;
2421 iov_count = iov_ret;
2422 iov = &cmd->iov_data[0];
2423
2424 padding = ((-length) & 3);
2425 if (padding != 0) {
2426 iov[iov_count].iov_base = cmd->pad_bytes;
2427 iov[iov_count++].iov_len = padding;
2428 rx_size += padding;
2429 }
2430
2431 if (conn->conn_ops->DataDigest) {
2432 iov[iov_count].iov_base = &checksum;
2433 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2434 rx_size += ISCSI_CRC_LEN;
2435 }
2436
2437 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2438
2439 iscsit_unmap_iovec(cmd);
2440
2441 if (rx_got != rx_size) {
2442 iscsit_rx_thread_wait_for_tcp(conn);
2443 return IMMEDIATE_DATA_CANNOT_RECOVER;
2444 }
2445
2446 if (conn->conn_ops->DataDigest) {
2447 u32 data_crc;
2448
2449 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2450 cmd->write_data_done, length, padding,
2451 cmd->pad_bytes);
2452
2453 if (checksum != data_crc) {
2454 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2455 " does not match computed 0x%08x\n", checksum,
2456 data_crc);
2457
2458 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2459 pr_err("Unable to recover from"
2460 " Immediate Data digest failure while"
2461 " in ERL=0.\n");
2462 iscsit_reject_cmd(cmd,
2463 ISCSI_REASON_DATA_DIGEST_ERROR,
2464 (unsigned char *)hdr);
2465 return IMMEDIATE_DATA_CANNOT_RECOVER;
2466 } else {
2467 iscsit_reject_cmd(cmd,
2468 ISCSI_REASON_DATA_DIGEST_ERROR,
2469 (unsigned char *)hdr);
2470 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2471 }
2472 } else {
2473 pr_debug("Got CRC32C DataDigest 0x%08x for"
2474 " %u bytes of Immediate Data\n", checksum,
2475 length);
2476 }
2477 }
2478
2479 cmd->write_data_done += length;
2480
2481 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2482 spin_lock_bh(&cmd->istate_lock);
2483 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2484 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2485 spin_unlock_bh(&cmd->istate_lock);
2486 }
2487
2488 return IMMEDIATE_DATA_NORMAL_OPERATION;
2489 }
2490
2491 /*
2492 * Called with sess->conn_lock held.
2493 */
2494 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2495 with active network interface */
iscsit_build_conn_drop_async_message(struct iscsi_conn * conn)2496 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2497 {
2498 struct iscsi_cmd *cmd;
2499 struct iscsi_conn *conn_p;
2500 bool found = false;
2501
2502 /*
2503 * Only send a Asynchronous Message on connections whos network
2504 * interface is still functional.
2505 */
2506 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2507 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2508 iscsit_inc_conn_usage_count(conn_p);
2509 found = true;
2510 break;
2511 }
2512 }
2513
2514 if (!found)
2515 return;
2516
2517 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2518 if (!cmd) {
2519 iscsit_dec_conn_usage_count(conn_p);
2520 return;
2521 }
2522
2523 cmd->logout_cid = conn->cid;
2524 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2525 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2526
2527 spin_lock_bh(&conn_p->cmd_lock);
2528 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2529 spin_unlock_bh(&conn_p->cmd_lock);
2530
2531 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2532 iscsit_dec_conn_usage_count(conn_p);
2533 }
2534
iscsit_send_conn_drop_async_message(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2535 static int iscsit_send_conn_drop_async_message(
2536 struct iscsi_cmd *cmd,
2537 struct iscsi_conn *conn)
2538 {
2539 struct iscsi_async *hdr;
2540
2541 cmd->tx_size = ISCSI_HDR_LEN;
2542 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2543
2544 hdr = (struct iscsi_async *) cmd->pdu;
2545 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2546 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2547 cmd->init_task_tag = RESERVED_ITT;
2548 cmd->targ_xfer_tag = 0xFFFFFFFF;
2549 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2550 cmd->stat_sn = conn->stat_sn++;
2551 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2552 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2553 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2554 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2555 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2556 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2557 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2558
2559 if (conn->conn_ops->HeaderDigest) {
2560 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2561
2562 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2563 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2564
2565 cmd->tx_size += ISCSI_CRC_LEN;
2566 pr_debug("Attaching CRC32C HeaderDigest to"
2567 " Async Message 0x%08x\n", *header_digest);
2568 }
2569
2570 cmd->iov_misc[0].iov_base = cmd->pdu;
2571 cmd->iov_misc[0].iov_len = cmd->tx_size;
2572 cmd->iov_misc_count = 1;
2573
2574 pr_debug("Sending Connection Dropped Async Message StatSN:"
2575 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2576 cmd->logout_cid, conn->cid);
2577 return 0;
2578 }
2579
iscsit_tx_thread_wait_for_tcp(struct iscsi_conn * conn)2580 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2581 {
2582 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2583 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2584 wait_for_completion_interruptible_timeout(
2585 &conn->tx_half_close_comp,
2586 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2587 }
2588 }
2589
2590 static void
iscsit_build_datain_pdu(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_datain * datain,struct iscsi_data_rsp * hdr,bool set_statsn)2591 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2592 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2593 bool set_statsn)
2594 {
2595 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2596 hdr->flags = datain->flags;
2597 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2598 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2599 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2600 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2601 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2602 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2603 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2604 }
2605 }
2606 hton24(hdr->dlength, datain->length);
2607 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2608 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2609 (struct scsi_lun *)&hdr->lun);
2610 else
2611 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2612
2613 hdr->itt = cmd->init_task_tag;
2614
2615 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2616 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2617 else
2618 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2619 if (set_statsn)
2620 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2621 else
2622 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2623
2624 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2625 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2626 hdr->datasn = cpu_to_be32(datain->data_sn);
2627 hdr->offset = cpu_to_be32(datain->offset);
2628
2629 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2630 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2631 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2632 ntohl(hdr->offset), datain->length, conn->cid);
2633 }
2634
iscsit_send_datain(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2635 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2636 {
2637 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2638 struct iscsi_datain datain;
2639 struct iscsi_datain_req *dr;
2640 struct kvec *iov;
2641 u32 iov_count = 0, tx_size = 0;
2642 int eodr = 0, ret, iov_ret;
2643 bool set_statsn = false;
2644
2645 memset(&datain, 0, sizeof(struct iscsi_datain));
2646 dr = iscsit_get_datain_values(cmd, &datain);
2647 if (!dr) {
2648 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2649 cmd->init_task_tag);
2650 return -1;
2651 }
2652 /*
2653 * Be paranoid and double check the logic for now.
2654 */
2655 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2656 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2657 " datain.length: %u exceeds cmd->data_length: %u\n",
2658 cmd->init_task_tag, datain.offset, datain.length,
2659 cmd->se_cmd.data_length);
2660 return -1;
2661 }
2662
2663 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2664 /*
2665 * Special case for successfully execution w/ both DATAIN
2666 * and Sense Data.
2667 */
2668 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2669 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2670 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2671 else {
2672 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2673 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2674 iscsit_increment_maxcmdsn(cmd, conn->sess);
2675 cmd->stat_sn = conn->stat_sn++;
2676 set_statsn = true;
2677 } else if (dr->dr_complete ==
2678 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2679 set_statsn = true;
2680 }
2681
2682 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2683
2684 iov = &cmd->iov_data[0];
2685 iov[iov_count].iov_base = cmd->pdu;
2686 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2687 tx_size += ISCSI_HDR_LEN;
2688
2689 if (conn->conn_ops->HeaderDigest) {
2690 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2691
2692 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2693 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2694
2695 iov[0].iov_len += ISCSI_CRC_LEN;
2696 tx_size += ISCSI_CRC_LEN;
2697
2698 pr_debug("Attaching CRC32 HeaderDigest"
2699 " for DataIN PDU 0x%08x\n", *header_digest);
2700 }
2701
2702 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2703 datain.offset, datain.length);
2704 if (iov_ret < 0)
2705 return -1;
2706
2707 iov_count += iov_ret;
2708 tx_size += datain.length;
2709
2710 cmd->padding = ((-datain.length) & 3);
2711 if (cmd->padding) {
2712 iov[iov_count].iov_base = cmd->pad_bytes;
2713 iov[iov_count++].iov_len = cmd->padding;
2714 tx_size += cmd->padding;
2715
2716 pr_debug("Attaching %u padding bytes\n",
2717 cmd->padding);
2718 }
2719 if (conn->conn_ops->DataDigest) {
2720 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2721 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2722
2723 iov[iov_count].iov_base = &cmd->data_crc;
2724 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2725 tx_size += ISCSI_CRC_LEN;
2726
2727 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2728 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2729 }
2730
2731 cmd->iov_data_count = iov_count;
2732 cmd->tx_size = tx_size;
2733
2734 ret = iscsit_fe_sendpage_sg(cmd, conn);
2735
2736 iscsit_unmap_iovec(cmd);
2737
2738 if (ret < 0) {
2739 iscsit_tx_thread_wait_for_tcp(conn);
2740 return ret;
2741 }
2742
2743 if (dr->dr_complete) {
2744 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2745 2 : 1;
2746 iscsit_free_datain_req(cmd, dr);
2747 }
2748
2749 return eodr;
2750 }
2751
2752 int
iscsit_build_logout_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_logout_rsp * hdr)2753 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2754 struct iscsi_logout_rsp *hdr)
2755 {
2756 struct iscsi_conn *logout_conn = NULL;
2757 struct iscsi_conn_recovery *cr = NULL;
2758 struct iscsi_session *sess = conn->sess;
2759 /*
2760 * The actual shutting down of Sessions and/or Connections
2761 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2762 * is done in scsi_logout_post_handler().
2763 */
2764 switch (cmd->logout_reason) {
2765 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2766 pr_debug("iSCSI session logout successful, setting"
2767 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2768 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2769 break;
2770 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2771 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2772 break;
2773 /*
2774 * For CLOSECONNECTION logout requests carrying
2775 * a matching logout CID -> local CID, the reference
2776 * for the local CID will have been incremented in
2777 * iscsi_logout_closeconnection().
2778 *
2779 * For CLOSECONNECTION logout requests carrying
2780 * a different CID than the connection it arrived
2781 * on, the connection responding to cmd->logout_cid
2782 * is stopped in iscsit_logout_post_handler_diffcid().
2783 */
2784
2785 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2786 " successful.\n", cmd->logout_cid, conn->cid);
2787 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2788 break;
2789 case ISCSI_LOGOUT_REASON_RECOVERY:
2790 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2791 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2792 break;
2793 /*
2794 * If the connection is still active from our point of view
2795 * force connection recovery to occur.
2796 */
2797 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2798 cmd->logout_cid);
2799 if (logout_conn) {
2800 iscsit_connection_reinstatement_rcfr(logout_conn);
2801 iscsit_dec_conn_usage_count(logout_conn);
2802 }
2803
2804 cr = iscsit_get_inactive_connection_recovery_entry(
2805 conn->sess, cmd->logout_cid);
2806 if (!cr) {
2807 pr_err("Unable to locate CID: %hu for"
2808 " REMOVECONNFORRECOVERY Logout Request.\n",
2809 cmd->logout_cid);
2810 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2811 break;
2812 }
2813
2814 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2815
2816 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2817 " for recovery for CID: %hu on CID: %hu successful.\n",
2818 cmd->logout_cid, conn->cid);
2819 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2820 break;
2821 default:
2822 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2823 cmd->logout_reason);
2824 return -1;
2825 }
2826
2827 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2828 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2829 hdr->response = cmd->logout_response;
2830 hdr->itt = cmd->init_task_tag;
2831 cmd->stat_sn = conn->stat_sn++;
2832 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2833
2834 iscsit_increment_maxcmdsn(cmd, conn->sess);
2835 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2836 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2837
2838 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2839 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2840 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2841 cmd->logout_cid, conn->cid);
2842
2843 return 0;
2844 }
2845 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2846
2847 static int
iscsit_send_logout(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2848 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2849 {
2850 struct kvec *iov;
2851 int niov = 0, tx_size, rc;
2852
2853 rc = iscsit_build_logout_rsp(cmd, conn,
2854 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2855 if (rc < 0)
2856 return rc;
2857
2858 tx_size = ISCSI_HDR_LEN;
2859 iov = &cmd->iov_misc[0];
2860 iov[niov].iov_base = cmd->pdu;
2861 iov[niov++].iov_len = ISCSI_HDR_LEN;
2862
2863 if (conn->conn_ops->HeaderDigest) {
2864 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2865
2866 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2867 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2868
2869 iov[0].iov_len += ISCSI_CRC_LEN;
2870 tx_size += ISCSI_CRC_LEN;
2871 pr_debug("Attaching CRC32C HeaderDigest to"
2872 " Logout Response 0x%08x\n", *header_digest);
2873 }
2874 cmd->iov_misc_count = niov;
2875 cmd->tx_size = tx_size;
2876
2877 return 0;
2878 }
2879
2880 void
iscsit_build_nopin_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_nopin * hdr,bool nopout_response)2881 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2882 struct iscsi_nopin *hdr, bool nopout_response)
2883 {
2884 hdr->opcode = ISCSI_OP_NOOP_IN;
2885 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2886 hton24(hdr->dlength, cmd->buf_ptr_size);
2887 if (nopout_response)
2888 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2889 hdr->itt = cmd->init_task_tag;
2890 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2891 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2892 conn->stat_sn;
2893 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2894
2895 if (nopout_response)
2896 iscsit_increment_maxcmdsn(cmd, conn->sess);
2897
2898 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2899 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2900
2901 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2902 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2903 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2904 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2905 }
2906 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2907
2908 /*
2909 * Unsolicited NOPIN, either requesting a response or not.
2910 */
iscsit_send_unsolicited_nopin(struct iscsi_cmd * cmd,struct iscsi_conn * conn,int want_response)2911 static int iscsit_send_unsolicited_nopin(
2912 struct iscsi_cmd *cmd,
2913 struct iscsi_conn *conn,
2914 int want_response)
2915 {
2916 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2917 int tx_size = ISCSI_HDR_LEN, ret;
2918
2919 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2920
2921 if (conn->conn_ops->HeaderDigest) {
2922 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2923
2924 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2925 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2926
2927 tx_size += ISCSI_CRC_LEN;
2928 pr_debug("Attaching CRC32C HeaderDigest to"
2929 " NopIN 0x%08x\n", *header_digest);
2930 }
2931
2932 cmd->iov_misc[0].iov_base = cmd->pdu;
2933 cmd->iov_misc[0].iov_len = tx_size;
2934 cmd->iov_misc_count = 1;
2935 cmd->tx_size = tx_size;
2936
2937 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2938 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2939
2940 ret = iscsit_send_tx_data(cmd, conn, 1);
2941 if (ret < 0) {
2942 iscsit_tx_thread_wait_for_tcp(conn);
2943 return ret;
2944 }
2945
2946 spin_lock_bh(&cmd->istate_lock);
2947 cmd->i_state = want_response ?
2948 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2949 spin_unlock_bh(&cmd->istate_lock);
2950
2951 return 0;
2952 }
2953
2954 static int
iscsit_send_nopin(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2955 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2956 {
2957 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2958 struct kvec *iov;
2959 u32 padding = 0;
2960 int niov = 0, tx_size;
2961
2962 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2963
2964 tx_size = ISCSI_HDR_LEN;
2965 iov = &cmd->iov_misc[0];
2966 iov[niov].iov_base = cmd->pdu;
2967 iov[niov++].iov_len = ISCSI_HDR_LEN;
2968
2969 if (conn->conn_ops->HeaderDigest) {
2970 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2971
2972 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2973 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2974
2975 iov[0].iov_len += ISCSI_CRC_LEN;
2976 tx_size += ISCSI_CRC_LEN;
2977 pr_debug("Attaching CRC32C HeaderDigest"
2978 " to NopIn 0x%08x\n", *header_digest);
2979 }
2980
2981 /*
2982 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2983 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2984 */
2985 if (cmd->buf_ptr_size) {
2986 iov[niov].iov_base = cmd->buf_ptr;
2987 iov[niov++].iov_len = cmd->buf_ptr_size;
2988 tx_size += cmd->buf_ptr_size;
2989
2990 pr_debug("Echoing back %u bytes of ping"
2991 " data.\n", cmd->buf_ptr_size);
2992
2993 padding = ((-cmd->buf_ptr_size) & 3);
2994 if (padding != 0) {
2995 iov[niov].iov_base = &cmd->pad_bytes;
2996 iov[niov++].iov_len = padding;
2997 tx_size += padding;
2998 pr_debug("Attaching %u additional"
2999 " padding bytes.\n", padding);
3000 }
3001 if (conn->conn_ops->DataDigest) {
3002 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3003 cmd->buf_ptr, cmd->buf_ptr_size,
3004 padding, (u8 *)&cmd->pad_bytes,
3005 (u8 *)&cmd->data_crc);
3006
3007 iov[niov].iov_base = &cmd->data_crc;
3008 iov[niov++].iov_len = ISCSI_CRC_LEN;
3009 tx_size += ISCSI_CRC_LEN;
3010 pr_debug("Attached DataDigest for %u"
3011 " bytes of ping data, CRC 0x%08x\n",
3012 cmd->buf_ptr_size, cmd->data_crc);
3013 }
3014 }
3015
3016 cmd->iov_misc_count = niov;
3017 cmd->tx_size = tx_size;
3018
3019 return 0;
3020 }
3021
iscsit_send_r2t(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3022 static int iscsit_send_r2t(
3023 struct iscsi_cmd *cmd,
3024 struct iscsi_conn *conn)
3025 {
3026 int tx_size = 0;
3027 struct iscsi_r2t *r2t;
3028 struct iscsi_r2t_rsp *hdr;
3029 int ret;
3030
3031 r2t = iscsit_get_r2t_from_list(cmd);
3032 if (!r2t)
3033 return -1;
3034
3035 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3036 memset(hdr, 0, ISCSI_HDR_LEN);
3037 hdr->opcode = ISCSI_OP_R2T;
3038 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3039 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3040 (struct scsi_lun *)&hdr->lun);
3041 hdr->itt = cmd->init_task_tag;
3042 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3043 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3044 hdr->statsn = cpu_to_be32(conn->stat_sn);
3045 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3046 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3047 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3048 hdr->data_offset = cpu_to_be32(r2t->offset);
3049 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3050
3051 cmd->iov_misc[0].iov_base = cmd->pdu;
3052 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3053 tx_size += ISCSI_HDR_LEN;
3054
3055 if (conn->conn_ops->HeaderDigest) {
3056 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3057
3058 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3059 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3060
3061 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3062 tx_size += ISCSI_CRC_LEN;
3063 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3064 " PDU 0x%08x\n", *header_digest);
3065 }
3066
3067 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3068 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3069 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3070 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3071 r2t->offset, r2t->xfer_len, conn->cid);
3072
3073 cmd->iov_misc_count = 1;
3074 cmd->tx_size = tx_size;
3075
3076 spin_lock_bh(&cmd->r2t_lock);
3077 r2t->sent_r2t = 1;
3078 spin_unlock_bh(&cmd->r2t_lock);
3079
3080 ret = iscsit_send_tx_data(cmd, conn, 1);
3081 if (ret < 0) {
3082 iscsit_tx_thread_wait_for_tcp(conn);
3083 return ret;
3084 }
3085
3086 spin_lock_bh(&cmd->dataout_timeout_lock);
3087 iscsit_start_dataout_timer(cmd, conn);
3088 spin_unlock_bh(&cmd->dataout_timeout_lock);
3089
3090 return 0;
3091 }
3092
3093 /*
3094 * @recovery: If called from iscsi_task_reassign_complete_write() for
3095 * connection recovery.
3096 */
iscsit_build_r2ts_for_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,bool recovery)3097 int iscsit_build_r2ts_for_cmd(
3098 struct iscsi_conn *conn,
3099 struct iscsi_cmd *cmd,
3100 bool recovery)
3101 {
3102 int first_r2t = 1;
3103 u32 offset = 0, xfer_len = 0;
3104
3105 spin_lock_bh(&cmd->r2t_lock);
3106 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3107 spin_unlock_bh(&cmd->r2t_lock);
3108 return 0;
3109 }
3110
3111 if (conn->sess->sess_ops->DataSequenceInOrder &&
3112 !recovery)
3113 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3114
3115 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3116 if (conn->sess->sess_ops->DataSequenceInOrder) {
3117 offset = cmd->r2t_offset;
3118
3119 if (first_r2t && recovery) {
3120 int new_data_end = offset +
3121 conn->sess->sess_ops->MaxBurstLength -
3122 cmd->next_burst_len;
3123
3124 if (new_data_end > cmd->se_cmd.data_length)
3125 xfer_len = cmd->se_cmd.data_length - offset;
3126 else
3127 xfer_len =
3128 conn->sess->sess_ops->MaxBurstLength -
3129 cmd->next_burst_len;
3130 } else {
3131 int new_data_end = offset +
3132 conn->sess->sess_ops->MaxBurstLength;
3133
3134 if (new_data_end > cmd->se_cmd.data_length)
3135 xfer_len = cmd->se_cmd.data_length - offset;
3136 else
3137 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3138 }
3139 cmd->r2t_offset += xfer_len;
3140
3141 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3142 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3143 } else {
3144 struct iscsi_seq *seq;
3145
3146 seq = iscsit_get_seq_holder_for_r2t(cmd);
3147 if (!seq) {
3148 spin_unlock_bh(&cmd->r2t_lock);
3149 return -1;
3150 }
3151
3152 offset = seq->offset;
3153 xfer_len = seq->xfer_len;
3154
3155 if (cmd->seq_send_order == cmd->seq_count)
3156 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3157 }
3158 cmd->outstanding_r2ts++;
3159 first_r2t = 0;
3160
3161 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3162 spin_unlock_bh(&cmd->r2t_lock);
3163 return -1;
3164 }
3165
3166 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3167 break;
3168 }
3169 spin_unlock_bh(&cmd->r2t_lock);
3170
3171 return 0;
3172 }
3173
iscsit_build_rsp_pdu(struct iscsi_cmd * cmd,struct iscsi_conn * conn,bool inc_stat_sn,struct iscsi_scsi_rsp * hdr)3174 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3175 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3176 {
3177 if (inc_stat_sn)
3178 cmd->stat_sn = conn->stat_sn++;
3179
3180 atomic_long_inc(&conn->sess->rsp_pdus);
3181
3182 memset(hdr, 0, ISCSI_HDR_LEN);
3183 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3184 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3185 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3186 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3187 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3188 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3189 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3190 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3191 }
3192 hdr->response = cmd->iscsi_response;
3193 hdr->cmd_status = cmd->se_cmd.scsi_status;
3194 hdr->itt = cmd->init_task_tag;
3195 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3196
3197 iscsit_increment_maxcmdsn(cmd, conn->sess);
3198 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3199 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3200
3201 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3202 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3203 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3204 cmd->se_cmd.scsi_status, conn->cid);
3205 }
3206 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3207
iscsit_send_response(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3208 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3209 {
3210 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3211 struct kvec *iov;
3212 u32 padding = 0, tx_size = 0;
3213 int iov_count = 0;
3214 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3215
3216 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3217
3218 iov = &cmd->iov_misc[0];
3219 iov[iov_count].iov_base = cmd->pdu;
3220 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3221 tx_size += ISCSI_HDR_LEN;
3222
3223 /*
3224 * Attach SENSE DATA payload to iSCSI Response PDU
3225 */
3226 if (cmd->se_cmd.sense_buffer &&
3227 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3228 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3229 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3230 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3231
3232 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3233 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3234 iov[iov_count].iov_base = cmd->sense_buffer;
3235 iov[iov_count++].iov_len =
3236 (cmd->se_cmd.scsi_sense_length + padding);
3237 tx_size += cmd->se_cmd.scsi_sense_length;
3238
3239 if (padding) {
3240 memset(cmd->sense_buffer +
3241 cmd->se_cmd.scsi_sense_length, 0, padding);
3242 tx_size += padding;
3243 pr_debug("Adding %u bytes of padding to"
3244 " SENSE.\n", padding);
3245 }
3246
3247 if (conn->conn_ops->DataDigest) {
3248 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3249 cmd->sense_buffer,
3250 (cmd->se_cmd.scsi_sense_length + padding),
3251 0, NULL, (u8 *)&cmd->data_crc);
3252
3253 iov[iov_count].iov_base = &cmd->data_crc;
3254 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3255 tx_size += ISCSI_CRC_LEN;
3256
3257 pr_debug("Attaching CRC32 DataDigest for"
3258 " SENSE, %u bytes CRC 0x%08x\n",
3259 (cmd->se_cmd.scsi_sense_length + padding),
3260 cmd->data_crc);
3261 }
3262
3263 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3264 " Response PDU\n",
3265 cmd->se_cmd.scsi_sense_length);
3266 }
3267
3268 if (conn->conn_ops->HeaderDigest) {
3269 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3270
3271 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3272 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3273
3274 iov[0].iov_len += ISCSI_CRC_LEN;
3275 tx_size += ISCSI_CRC_LEN;
3276 pr_debug("Attaching CRC32 HeaderDigest for Response"
3277 " PDU 0x%08x\n", *header_digest);
3278 }
3279
3280 cmd->iov_misc_count = iov_count;
3281 cmd->tx_size = tx_size;
3282
3283 return 0;
3284 }
3285
iscsit_convert_tcm_tmr_rsp(struct se_tmr_req * se_tmr)3286 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3287 {
3288 switch (se_tmr->response) {
3289 case TMR_FUNCTION_COMPLETE:
3290 return ISCSI_TMF_RSP_COMPLETE;
3291 case TMR_TASK_DOES_NOT_EXIST:
3292 return ISCSI_TMF_RSP_NO_TASK;
3293 case TMR_LUN_DOES_NOT_EXIST:
3294 return ISCSI_TMF_RSP_NO_LUN;
3295 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3296 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3297 case TMR_FUNCTION_REJECTED:
3298 default:
3299 return ISCSI_TMF_RSP_REJECTED;
3300 }
3301 }
3302
3303 void
iscsit_build_task_mgt_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_tm_rsp * hdr)3304 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3305 struct iscsi_tm_rsp *hdr)
3306 {
3307 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3308
3309 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3310 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3311 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3312 hdr->itt = cmd->init_task_tag;
3313 cmd->stat_sn = conn->stat_sn++;
3314 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3315
3316 iscsit_increment_maxcmdsn(cmd, conn->sess);
3317 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3318 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3319
3320 pr_debug("Built Task Management Response ITT: 0x%08x,"
3321 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3322 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3323 }
3324 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3325
3326 static int
iscsit_send_task_mgt_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3327 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3328 {
3329 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3330 u32 tx_size = 0;
3331
3332 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3333
3334 cmd->iov_misc[0].iov_base = cmd->pdu;
3335 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3336 tx_size += ISCSI_HDR_LEN;
3337
3338 if (conn->conn_ops->HeaderDigest) {
3339 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3340
3341 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3342 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3343
3344 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3345 tx_size += ISCSI_CRC_LEN;
3346 pr_debug("Attaching CRC32 HeaderDigest for Task"
3347 " Mgmt Response PDU 0x%08x\n", *header_digest);
3348 }
3349
3350 cmd->iov_misc_count = 1;
3351 cmd->tx_size = tx_size;
3352
3353 return 0;
3354 }
3355
iscsit_check_inaddr_any(struct iscsi_np * np)3356 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3357 {
3358 bool ret = false;
3359
3360 if (np->np_sockaddr.ss_family == AF_INET6) {
3361 const struct sockaddr_in6 sin6 = {
3362 .sin6_addr = IN6ADDR_ANY_INIT };
3363 struct sockaddr_in6 *sock_in6 =
3364 (struct sockaddr_in6 *)&np->np_sockaddr;
3365
3366 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3367 sin6.sin6_addr.s6_addr, 16))
3368 ret = true;
3369 } else {
3370 struct sockaddr_in * sock_in =
3371 (struct sockaddr_in *)&np->np_sockaddr;
3372
3373 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3374 ret = true;
3375 }
3376
3377 return ret;
3378 }
3379
3380 #define SENDTARGETS_BUF_LIMIT 32768U
3381
3382 static int
iscsit_build_sendtargets_response(struct iscsi_cmd * cmd,enum iscsit_transport_type network_transport,int skip_bytes,bool * completed)3383 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3384 enum iscsit_transport_type network_transport,
3385 int skip_bytes, bool *completed)
3386 {
3387 char *payload = NULL;
3388 struct iscsi_conn *conn = cmd->conn;
3389 struct iscsi_portal_group *tpg;
3390 struct iscsi_tiqn *tiqn;
3391 struct iscsi_tpg_np *tpg_np;
3392 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3393 int target_name_printed;
3394 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3395 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3396 bool active;
3397
3398 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3399 SENDTARGETS_BUF_LIMIT);
3400
3401 payload = kzalloc(buffer_len, GFP_KERNEL);
3402 if (!payload) {
3403 pr_err("Unable to allocate memory for sendtargets"
3404 " response.\n");
3405 return -ENOMEM;
3406 }
3407 /*
3408 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3409 * explicit case..
3410 */
3411 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3412 text_ptr = strchr(text_in, '=');
3413 if (!text_ptr) {
3414 pr_err("Unable to locate '=' string in text_in:"
3415 " %s\n", text_in);
3416 kfree(payload);
3417 return -EINVAL;
3418 }
3419 /*
3420 * Skip over '=' character..
3421 */
3422 text_ptr += 1;
3423 }
3424
3425 spin_lock(&tiqn_lock);
3426 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3427 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3428 strcmp(tiqn->tiqn, text_ptr)) {
3429 continue;
3430 }
3431
3432 target_name_printed = 0;
3433
3434 spin_lock(&tiqn->tiqn_tpg_lock);
3435 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3436
3437 /* If demo_mode_discovery=0 and generate_node_acls=0
3438 * (demo mode dislabed) do not return
3439 * TargetName+TargetAddress unless a NodeACL exists.
3440 */
3441
3442 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3443 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3444 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3445 cmd->conn->sess->sess_ops->InitiatorName))) {
3446 continue;
3447 }
3448
3449 spin_lock(&tpg->tpg_state_lock);
3450 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3451 spin_unlock(&tpg->tpg_state_lock);
3452
3453 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3454 continue;
3455
3456 spin_lock(&tpg->tpg_np_lock);
3457 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3458 tpg_np_list) {
3459 struct iscsi_np *np = tpg_np->tpg_np;
3460 bool inaddr_any = iscsit_check_inaddr_any(np);
3461 struct sockaddr_storage *sockaddr;
3462
3463 if (np->np_network_transport != network_transport)
3464 continue;
3465
3466 if (!target_name_printed) {
3467 len = sprintf(buf, "TargetName=%s",
3468 tiqn->tiqn);
3469 len += 1;
3470
3471 if ((len + payload_len) > buffer_len) {
3472 spin_unlock(&tpg->tpg_np_lock);
3473 spin_unlock(&tiqn->tiqn_tpg_lock);
3474 end_of_buf = 1;
3475 goto eob;
3476 }
3477
3478 if (skip_bytes && len <= skip_bytes) {
3479 skip_bytes -= len;
3480 } else {
3481 memcpy(payload + payload_len, buf, len);
3482 payload_len += len;
3483 target_name_printed = 1;
3484 if (len > skip_bytes)
3485 skip_bytes = 0;
3486 }
3487 }
3488
3489 if (inaddr_any)
3490 sockaddr = &conn->local_sockaddr;
3491 else
3492 sockaddr = &np->np_sockaddr;
3493
3494 len = sprintf(buf, "TargetAddress="
3495 "%pISpc,%hu",
3496 sockaddr,
3497 tpg->tpgt);
3498 len += 1;
3499
3500 if ((len + payload_len) > buffer_len) {
3501 spin_unlock(&tpg->tpg_np_lock);
3502 spin_unlock(&tiqn->tiqn_tpg_lock);
3503 end_of_buf = 1;
3504 goto eob;
3505 }
3506
3507 if (skip_bytes && len <= skip_bytes) {
3508 skip_bytes -= len;
3509 } else {
3510 memcpy(payload + payload_len, buf, len);
3511 payload_len += len;
3512 if (len > skip_bytes)
3513 skip_bytes = 0;
3514 }
3515 }
3516 spin_unlock(&tpg->tpg_np_lock);
3517 }
3518 spin_unlock(&tiqn->tiqn_tpg_lock);
3519 eob:
3520 if (end_of_buf) {
3521 *completed = false;
3522 break;
3523 }
3524
3525 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3526 break;
3527 }
3528 spin_unlock(&tiqn_lock);
3529
3530 cmd->buf_ptr = payload;
3531
3532 return payload_len;
3533 }
3534
3535 int
iscsit_build_text_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_text_rsp * hdr,enum iscsit_transport_type network_transport)3536 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3537 struct iscsi_text_rsp *hdr,
3538 enum iscsit_transport_type network_transport)
3539 {
3540 int text_length, padding;
3541 bool completed = true;
3542
3543 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3544 cmd->read_data_done,
3545 &completed);
3546 if (text_length < 0)
3547 return text_length;
3548
3549 if (completed) {
3550 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3551 } else {
3552 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3553 cmd->read_data_done += text_length;
3554 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3555 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3556 }
3557 hdr->opcode = ISCSI_OP_TEXT_RSP;
3558 padding = ((-text_length) & 3);
3559 hton24(hdr->dlength, text_length);
3560 hdr->itt = cmd->init_task_tag;
3561 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3562 cmd->stat_sn = conn->stat_sn++;
3563 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3564
3565 iscsit_increment_maxcmdsn(cmd, conn->sess);
3566 /*
3567 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3568 * correctly increment MaxCmdSN for each response answering a
3569 * non immediate text request with a valid CmdSN.
3570 */
3571 cmd->maxcmdsn_inc = 0;
3572 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3573 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3574
3575 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3576 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3577 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3578 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3579 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3580
3581 return text_length + padding;
3582 }
3583 EXPORT_SYMBOL(iscsit_build_text_rsp);
3584
iscsit_send_text_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3585 static int iscsit_send_text_rsp(
3586 struct iscsi_cmd *cmd,
3587 struct iscsi_conn *conn)
3588 {
3589 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3590 struct kvec *iov;
3591 u32 tx_size = 0;
3592 int text_length, iov_count = 0, rc;
3593
3594 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP);
3595 if (rc < 0)
3596 return rc;
3597
3598 text_length = rc;
3599 iov = &cmd->iov_misc[0];
3600 iov[iov_count].iov_base = cmd->pdu;
3601 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3602 iov[iov_count].iov_base = cmd->buf_ptr;
3603 iov[iov_count++].iov_len = text_length;
3604
3605 tx_size += (ISCSI_HDR_LEN + text_length);
3606
3607 if (conn->conn_ops->HeaderDigest) {
3608 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3609
3610 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3611 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3612
3613 iov[0].iov_len += ISCSI_CRC_LEN;
3614 tx_size += ISCSI_CRC_LEN;
3615 pr_debug("Attaching CRC32 HeaderDigest for"
3616 " Text Response PDU 0x%08x\n", *header_digest);
3617 }
3618
3619 if (conn->conn_ops->DataDigest) {
3620 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3621 cmd->buf_ptr, text_length,
3622 0, NULL, (u8 *)&cmd->data_crc);
3623
3624 iov[iov_count].iov_base = &cmd->data_crc;
3625 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3626 tx_size += ISCSI_CRC_LEN;
3627
3628 pr_debug("Attaching DataDigest for %u bytes of text"
3629 " data, CRC 0x%08x\n", text_length,
3630 cmd->data_crc);
3631 }
3632
3633 cmd->iov_misc_count = iov_count;
3634 cmd->tx_size = tx_size;
3635
3636 return 0;
3637 }
3638
3639 void
iscsit_build_reject(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_reject * hdr)3640 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3641 struct iscsi_reject *hdr)
3642 {
3643 hdr->opcode = ISCSI_OP_REJECT;
3644 hdr->reason = cmd->reject_reason;
3645 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3646 hton24(hdr->dlength, ISCSI_HDR_LEN);
3647 hdr->ffffffff = cpu_to_be32(0xffffffff);
3648 cmd->stat_sn = conn->stat_sn++;
3649 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3650 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3651 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3652
3653 }
3654 EXPORT_SYMBOL(iscsit_build_reject);
3655
iscsit_send_reject(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3656 static int iscsit_send_reject(
3657 struct iscsi_cmd *cmd,
3658 struct iscsi_conn *conn)
3659 {
3660 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3661 struct kvec *iov;
3662 u32 iov_count = 0, tx_size;
3663
3664 iscsit_build_reject(cmd, conn, hdr);
3665
3666 iov = &cmd->iov_misc[0];
3667 iov[iov_count].iov_base = cmd->pdu;
3668 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3669 iov[iov_count].iov_base = cmd->buf_ptr;
3670 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3671
3672 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3673
3674 if (conn->conn_ops->HeaderDigest) {
3675 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3676
3677 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3678 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3679
3680 iov[0].iov_len += ISCSI_CRC_LEN;
3681 tx_size += ISCSI_CRC_LEN;
3682 pr_debug("Attaching CRC32 HeaderDigest for"
3683 " REJECT PDU 0x%08x\n", *header_digest);
3684 }
3685
3686 if (conn->conn_ops->DataDigest) {
3687 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3688 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3689
3690 iov[iov_count].iov_base = &cmd->data_crc;
3691 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3692 tx_size += ISCSI_CRC_LEN;
3693 pr_debug("Attaching CRC32 DataDigest for REJECT"
3694 " PDU 0x%08x\n", cmd->data_crc);
3695 }
3696
3697 cmd->iov_misc_count = iov_count;
3698 cmd->tx_size = tx_size;
3699
3700 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3701 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3702
3703 return 0;
3704 }
3705
iscsit_thread_get_cpumask(struct iscsi_conn * conn)3706 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3707 {
3708 int ord, cpu;
3709 /*
3710 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3711 * within iscsit_start_kthreads()
3712 *
3713 * Here we use bitmap_id to determine which CPU that this
3714 * iSCSI connection's RX/TX threads will be scheduled to
3715 * execute upon.
3716 */
3717 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3718 for_each_online_cpu(cpu) {
3719 if (ord-- == 0) {
3720 cpumask_set_cpu(cpu, conn->conn_cpumask);
3721 return;
3722 }
3723 }
3724 /*
3725 * This should never be reached..
3726 */
3727 dump_stack();
3728 cpumask_setall(conn->conn_cpumask);
3729 }
3730
iscsit_thread_check_cpumask(struct iscsi_conn * conn,struct task_struct * p,int mode)3731 static inline void iscsit_thread_check_cpumask(
3732 struct iscsi_conn *conn,
3733 struct task_struct *p,
3734 int mode)
3735 {
3736 /*
3737 * mode == 1 signals iscsi_target_tx_thread() usage.
3738 * mode == 0 signals iscsi_target_rx_thread() usage.
3739 */
3740 if (mode == 1) {
3741 if (!conn->conn_tx_reset_cpumask)
3742 return;
3743 conn->conn_tx_reset_cpumask = 0;
3744 } else {
3745 if (!conn->conn_rx_reset_cpumask)
3746 return;
3747 conn->conn_rx_reset_cpumask = 0;
3748 }
3749 /*
3750 * Update the CPU mask for this single kthread so that
3751 * both TX and RX kthreads are scheduled to run on the
3752 * same CPU.
3753 */
3754 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3755 }
3756
3757 static int
iscsit_immediate_queue(struct iscsi_conn * conn,struct iscsi_cmd * cmd,int state)3758 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3759 {
3760 int ret;
3761
3762 switch (state) {
3763 case ISTATE_SEND_R2T:
3764 ret = iscsit_send_r2t(cmd, conn);
3765 if (ret < 0)
3766 goto err;
3767 break;
3768 case ISTATE_REMOVE:
3769 spin_lock_bh(&conn->cmd_lock);
3770 list_del_init(&cmd->i_conn_node);
3771 spin_unlock_bh(&conn->cmd_lock);
3772
3773 iscsit_free_cmd(cmd, false);
3774 break;
3775 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3776 iscsit_mod_nopin_response_timer(conn);
3777 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3778 if (ret < 0)
3779 goto err;
3780 break;
3781 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3782 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3783 if (ret < 0)
3784 goto err;
3785 break;
3786 default:
3787 pr_err("Unknown Opcode: 0x%02x ITT:"
3788 " 0x%08x, i_state: %d on CID: %hu\n",
3789 cmd->iscsi_opcode, cmd->init_task_tag, state,
3790 conn->cid);
3791 goto err;
3792 }
3793
3794 return 0;
3795
3796 err:
3797 return -1;
3798 }
3799
3800 static int
iscsit_handle_immediate_queue(struct iscsi_conn * conn)3801 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3802 {
3803 struct iscsit_transport *t = conn->conn_transport;
3804 struct iscsi_queue_req *qr;
3805 struct iscsi_cmd *cmd;
3806 u8 state;
3807 int ret;
3808
3809 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3810 atomic_set(&conn->check_immediate_queue, 0);
3811 cmd = qr->cmd;
3812 state = qr->state;
3813 kmem_cache_free(lio_qr_cache, qr);
3814
3815 ret = t->iscsit_immediate_queue(conn, cmd, state);
3816 if (ret < 0)
3817 return ret;
3818 }
3819
3820 return 0;
3821 }
3822
3823 static int
iscsit_response_queue(struct iscsi_conn * conn,struct iscsi_cmd * cmd,int state)3824 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3825 {
3826 int ret;
3827
3828 check_rsp_state:
3829 switch (state) {
3830 case ISTATE_SEND_DATAIN:
3831 ret = iscsit_send_datain(cmd, conn);
3832 if (ret < 0)
3833 goto err;
3834 else if (!ret)
3835 /* more drs */
3836 goto check_rsp_state;
3837 else if (ret == 1) {
3838 /* all done */
3839 spin_lock_bh(&cmd->istate_lock);
3840 cmd->i_state = ISTATE_SENT_STATUS;
3841 spin_unlock_bh(&cmd->istate_lock);
3842
3843 if (atomic_read(&conn->check_immediate_queue))
3844 return 1;
3845
3846 return 0;
3847 } else if (ret == 2) {
3848 /* Still must send status,
3849 SCF_TRANSPORT_TASK_SENSE was set */
3850 spin_lock_bh(&cmd->istate_lock);
3851 cmd->i_state = ISTATE_SEND_STATUS;
3852 spin_unlock_bh(&cmd->istate_lock);
3853 state = ISTATE_SEND_STATUS;
3854 goto check_rsp_state;
3855 }
3856
3857 break;
3858 case ISTATE_SEND_STATUS:
3859 case ISTATE_SEND_STATUS_RECOVERY:
3860 ret = iscsit_send_response(cmd, conn);
3861 break;
3862 case ISTATE_SEND_LOGOUTRSP:
3863 ret = iscsit_send_logout(cmd, conn);
3864 break;
3865 case ISTATE_SEND_ASYNCMSG:
3866 ret = iscsit_send_conn_drop_async_message(
3867 cmd, conn);
3868 break;
3869 case ISTATE_SEND_NOPIN:
3870 ret = iscsit_send_nopin(cmd, conn);
3871 break;
3872 case ISTATE_SEND_REJECT:
3873 ret = iscsit_send_reject(cmd, conn);
3874 break;
3875 case ISTATE_SEND_TASKMGTRSP:
3876 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3877 if (ret != 0)
3878 break;
3879 ret = iscsit_tmr_post_handler(cmd, conn);
3880 if (ret != 0)
3881 iscsit_fall_back_to_erl0(conn->sess);
3882 break;
3883 case ISTATE_SEND_TEXTRSP:
3884 ret = iscsit_send_text_rsp(cmd, conn);
3885 break;
3886 default:
3887 pr_err("Unknown Opcode: 0x%02x ITT:"
3888 " 0x%08x, i_state: %d on CID: %hu\n",
3889 cmd->iscsi_opcode, cmd->init_task_tag,
3890 state, conn->cid);
3891 goto err;
3892 }
3893 if (ret < 0)
3894 goto err;
3895
3896 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3897 iscsit_tx_thread_wait_for_tcp(conn);
3898 iscsit_unmap_iovec(cmd);
3899 goto err;
3900 }
3901 iscsit_unmap_iovec(cmd);
3902
3903 switch (state) {
3904 case ISTATE_SEND_LOGOUTRSP:
3905 if (!iscsit_logout_post_handler(cmd, conn))
3906 return -ECONNRESET;
3907 /* fall through */
3908 case ISTATE_SEND_STATUS:
3909 case ISTATE_SEND_ASYNCMSG:
3910 case ISTATE_SEND_NOPIN:
3911 case ISTATE_SEND_STATUS_RECOVERY:
3912 case ISTATE_SEND_TEXTRSP:
3913 case ISTATE_SEND_TASKMGTRSP:
3914 case ISTATE_SEND_REJECT:
3915 spin_lock_bh(&cmd->istate_lock);
3916 cmd->i_state = ISTATE_SENT_STATUS;
3917 spin_unlock_bh(&cmd->istate_lock);
3918 break;
3919 default:
3920 pr_err("Unknown Opcode: 0x%02x ITT:"
3921 " 0x%08x, i_state: %d on CID: %hu\n",
3922 cmd->iscsi_opcode, cmd->init_task_tag,
3923 cmd->i_state, conn->cid);
3924 goto err;
3925 }
3926
3927 if (atomic_read(&conn->check_immediate_queue))
3928 return 1;
3929
3930 return 0;
3931
3932 err:
3933 return -1;
3934 }
3935
iscsit_handle_response_queue(struct iscsi_conn * conn)3936 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3937 {
3938 struct iscsit_transport *t = conn->conn_transport;
3939 struct iscsi_queue_req *qr;
3940 struct iscsi_cmd *cmd;
3941 u8 state;
3942 int ret;
3943
3944 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3945 cmd = qr->cmd;
3946 state = qr->state;
3947 kmem_cache_free(lio_qr_cache, qr);
3948
3949 ret = t->iscsit_response_queue(conn, cmd, state);
3950 if (ret == 1 || ret < 0)
3951 return ret;
3952 }
3953
3954 return 0;
3955 }
3956
iscsi_target_tx_thread(void * arg)3957 int iscsi_target_tx_thread(void *arg)
3958 {
3959 int ret = 0;
3960 struct iscsi_conn *conn = arg;
3961 bool conn_freed = false;
3962
3963 /*
3964 * Allow ourselves to be interrupted by SIGINT so that a
3965 * connection recovery / failure event can be triggered externally.
3966 */
3967 allow_signal(SIGINT);
3968
3969 while (!kthread_should_stop()) {
3970 /*
3971 * Ensure that both TX and RX per connection kthreads
3972 * are scheduled to run on the same CPU.
3973 */
3974 iscsit_thread_check_cpumask(conn, current, 1);
3975
3976 wait_event_interruptible(conn->queues_wq,
3977 !iscsit_conn_all_queues_empty(conn));
3978
3979 if (signal_pending(current))
3980 goto transport_err;
3981
3982 get_immediate:
3983 ret = iscsit_handle_immediate_queue(conn);
3984 if (ret < 0)
3985 goto transport_err;
3986
3987 ret = iscsit_handle_response_queue(conn);
3988 if (ret == 1) {
3989 goto get_immediate;
3990 } else if (ret == -ECONNRESET) {
3991 conn_freed = true;
3992 goto out;
3993 } else if (ret < 0) {
3994 goto transport_err;
3995 }
3996 }
3997
3998 transport_err:
3999 /*
4000 * Avoid the normal connection failure code-path if this connection
4001 * is still within LOGIN mode, and iscsi_np process context is
4002 * responsible for cleaning up the early connection failure.
4003 */
4004 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
4005 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4006 out:
4007 if (!conn_freed) {
4008 while (!kthread_should_stop()) {
4009 msleep(100);
4010 }
4011 }
4012 return 0;
4013 }
4014
iscsi_target_rx_opcode(struct iscsi_conn * conn,unsigned char * buf)4015 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
4016 {
4017 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
4018 struct iscsi_cmd *cmd;
4019 int ret = 0;
4020
4021 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
4022 case ISCSI_OP_SCSI_CMD:
4023 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4024 if (!cmd)
4025 goto reject;
4026
4027 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
4028 break;
4029 case ISCSI_OP_SCSI_DATA_OUT:
4030 ret = iscsit_handle_data_out(conn, buf);
4031 break;
4032 case ISCSI_OP_NOOP_OUT:
4033 cmd = NULL;
4034 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4035 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4036 if (!cmd)
4037 goto reject;
4038 }
4039 ret = iscsit_handle_nop_out(conn, cmd, buf);
4040 break;
4041 case ISCSI_OP_SCSI_TMFUNC:
4042 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4043 if (!cmd)
4044 goto reject;
4045
4046 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4047 break;
4048 case ISCSI_OP_TEXT:
4049 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4050 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4051 if (!cmd)
4052 goto reject;
4053 } else {
4054 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4055 if (!cmd)
4056 goto reject;
4057 }
4058
4059 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4060 break;
4061 case ISCSI_OP_LOGOUT:
4062 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4063 if (!cmd)
4064 goto reject;
4065
4066 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4067 if (ret > 0)
4068 wait_for_completion_timeout(&conn->conn_logout_comp,
4069 SECONDS_FOR_LOGOUT_COMP * HZ);
4070 break;
4071 case ISCSI_OP_SNACK:
4072 ret = iscsit_handle_snack(conn, buf);
4073 break;
4074 default:
4075 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4076 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4077 pr_err("Cannot recover from unknown"
4078 " opcode while ERL=0, closing iSCSI connection.\n");
4079 return -1;
4080 }
4081 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
4082 " closing iSCSI connection.\n");
4083 ret = -1;
4084 break;
4085 }
4086
4087 return ret;
4088 reject:
4089 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4090 }
4091
iscsi_target_check_conn_state(struct iscsi_conn * conn)4092 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
4093 {
4094 bool ret;
4095
4096 spin_lock_bh(&conn->state_lock);
4097 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
4098 spin_unlock_bh(&conn->state_lock);
4099
4100 return ret;
4101 }
4102
iscsi_target_rx_thread(void * arg)4103 int iscsi_target_rx_thread(void *arg)
4104 {
4105 int ret, rc;
4106 u8 buffer[ISCSI_HDR_LEN], opcode;
4107 u32 checksum = 0, digest = 0;
4108 struct iscsi_conn *conn = arg;
4109 struct kvec iov;
4110 bool conn_freed = false;
4111 /*
4112 * Allow ourselves to be interrupted by SIGINT so that a
4113 * connection recovery / failure event can be triggered externally.
4114 */
4115 allow_signal(SIGINT);
4116 /*
4117 * Wait for iscsi_post_login_handler() to complete before allowing
4118 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4119 */
4120 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4121 if (rc < 0 || iscsi_target_check_conn_state(conn))
4122 goto out;
4123
4124 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4125 struct completion comp;
4126
4127 init_completion(&comp);
4128 rc = wait_for_completion_interruptible(&comp);
4129 if (rc < 0)
4130 goto transport_err;
4131
4132 goto transport_err;
4133 }
4134
4135 while (!kthread_should_stop()) {
4136 /*
4137 * Ensure that both TX and RX per connection kthreads
4138 * are scheduled to run on the same CPU.
4139 */
4140 iscsit_thread_check_cpumask(conn, current, 0);
4141
4142 memset(buffer, 0, ISCSI_HDR_LEN);
4143 memset(&iov, 0, sizeof(struct kvec));
4144
4145 iov.iov_base = buffer;
4146 iov.iov_len = ISCSI_HDR_LEN;
4147
4148 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4149 if (ret != ISCSI_HDR_LEN) {
4150 iscsit_rx_thread_wait_for_tcp(conn);
4151 goto transport_err;
4152 }
4153
4154 if (conn->conn_ops->HeaderDigest) {
4155 iov.iov_base = &digest;
4156 iov.iov_len = ISCSI_CRC_LEN;
4157
4158 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4159 if (ret != ISCSI_CRC_LEN) {
4160 iscsit_rx_thread_wait_for_tcp(conn);
4161 goto transport_err;
4162 }
4163
4164 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4165 buffer, ISCSI_HDR_LEN,
4166 0, NULL, (u8 *)&checksum);
4167
4168 if (digest != checksum) {
4169 pr_err("HeaderDigest CRC32C failed,"
4170 " received 0x%08x, computed 0x%08x\n",
4171 digest, checksum);
4172 /*
4173 * Set the PDU to 0xff so it will intentionally
4174 * hit default in the switch below.
4175 */
4176 memset(buffer, 0xff, ISCSI_HDR_LEN);
4177 atomic_long_inc(&conn->sess->conn_digest_errors);
4178 } else {
4179 pr_debug("Got HeaderDigest CRC32C"
4180 " 0x%08x\n", checksum);
4181 }
4182 }
4183
4184 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4185 goto transport_err;
4186
4187 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4188
4189 if (conn->sess->sess_ops->SessionType &&
4190 ((!(opcode & ISCSI_OP_TEXT)) ||
4191 (!(opcode & ISCSI_OP_LOGOUT)))) {
4192 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4193 " while in Discovery Session, rejecting.\n", opcode);
4194 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4195 buffer);
4196 goto transport_err;
4197 }
4198
4199 ret = iscsi_target_rx_opcode(conn, buffer);
4200 if (ret < 0)
4201 goto transport_err;
4202 }
4203
4204 transport_err:
4205 if (!signal_pending(current))
4206 atomic_set(&conn->transport_failed, 1);
4207 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4208 out:
4209 if (!conn_freed) {
4210 while (!kthread_should_stop()) {
4211 msleep(100);
4212 }
4213 }
4214 return 0;
4215 }
4216
iscsit_release_commands_from_conn(struct iscsi_conn * conn)4217 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4218 {
4219 LIST_HEAD(tmp_list);
4220 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4221 struct iscsi_session *sess = conn->sess;
4222 /*
4223 * We expect this function to only ever be called from either RX or TX
4224 * thread context via iscsit_close_connection() once the other context
4225 * has been reset -> returned sleeping pre-handler state.
4226 */
4227 spin_lock_bh(&conn->cmd_lock);
4228 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4229
4230 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4231 struct se_cmd *se_cmd = &cmd->se_cmd;
4232
4233 if (se_cmd->se_tfo != NULL) {
4234 spin_lock_irq(&se_cmd->t_state_lock);
4235 if (se_cmd->transport_state & CMD_T_ABORTED) {
4236 /*
4237 * LIO's abort path owns the cleanup for this,
4238 * so put it back on the list and let
4239 * aborted_task handle it.
4240 */
4241 list_move_tail(&cmd->i_conn_node,
4242 &conn->conn_cmd_list);
4243 } else {
4244 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4245 }
4246 spin_unlock_irq(&se_cmd->t_state_lock);
4247 }
4248 }
4249 spin_unlock_bh(&conn->cmd_lock);
4250
4251 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4252 list_del_init(&cmd->i_conn_node);
4253
4254 iscsit_increment_maxcmdsn(cmd, sess);
4255 iscsit_free_cmd(cmd, true);
4256
4257 }
4258 }
4259
iscsit_stop_timers_for_cmds(struct iscsi_conn * conn)4260 static void iscsit_stop_timers_for_cmds(
4261 struct iscsi_conn *conn)
4262 {
4263 struct iscsi_cmd *cmd;
4264
4265 spin_lock_bh(&conn->cmd_lock);
4266 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4267 if (cmd->data_direction == DMA_TO_DEVICE)
4268 iscsit_stop_dataout_timer(cmd);
4269 }
4270 spin_unlock_bh(&conn->cmd_lock);
4271 }
4272
iscsit_close_connection(struct iscsi_conn * conn)4273 int iscsit_close_connection(
4274 struct iscsi_conn *conn)
4275 {
4276 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4277 struct iscsi_session *sess = conn->sess;
4278
4279 pr_debug("Closing iSCSI connection CID %hu on SID:"
4280 " %u\n", conn->cid, sess->sid);
4281 /*
4282 * Always up conn_logout_comp for the traditional TCP case just in case
4283 * the RX Thread in iscsi_target_rx_opcode() is sleeping and the logout
4284 * response never got sent because the connection failed.
4285 *
4286 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4287 * to signal logout response TX interrupt completion. Go ahead and skip
4288 * this for iser since isert_rx_opcode() does not wait on logout failure,
4289 * and to avoid iscsi_conn pointer dereference in iser-target code.
4290 */
4291 if (conn->conn_transport->transport_type == ISCSI_TCP)
4292 complete(&conn->conn_logout_comp);
4293
4294 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4295 if (conn->tx_thread &&
4296 cmpxchg(&conn->tx_thread_active, true, false)) {
4297 send_sig(SIGINT, conn->tx_thread, 1);
4298 kthread_stop(conn->tx_thread);
4299 }
4300 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4301 if (conn->rx_thread &&
4302 cmpxchg(&conn->rx_thread_active, true, false)) {
4303 send_sig(SIGINT, conn->rx_thread, 1);
4304 kthread_stop(conn->rx_thread);
4305 }
4306 }
4307
4308 spin_lock(&iscsit_global->ts_bitmap_lock);
4309 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4310 get_order(1));
4311 spin_unlock(&iscsit_global->ts_bitmap_lock);
4312
4313 iscsit_stop_timers_for_cmds(conn);
4314 iscsit_stop_nopin_response_timer(conn);
4315 iscsit_stop_nopin_timer(conn);
4316
4317 if (conn->conn_transport->iscsit_wait_conn)
4318 conn->conn_transport->iscsit_wait_conn(conn);
4319
4320 /*
4321 * During Connection recovery drop unacknowledged out of order
4322 * commands for this connection, and prepare the other commands
4323 * for realligence.
4324 *
4325 * During normal operation clear the out of order commands (but
4326 * do not free the struct iscsi_ooo_cmdsn's) and release all
4327 * struct iscsi_cmds.
4328 */
4329 if (atomic_read(&conn->connection_recovery)) {
4330 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4331 iscsit_prepare_cmds_for_realligance(conn);
4332 } else {
4333 iscsit_clear_ooo_cmdsns_for_conn(conn);
4334 iscsit_release_commands_from_conn(conn);
4335 }
4336 iscsit_free_queue_reqs_for_conn(conn);
4337
4338 /*
4339 * Handle decrementing session or connection usage count if
4340 * a logout response was not able to be sent because the
4341 * connection failed. Fall back to Session Recovery here.
4342 */
4343 if (atomic_read(&conn->conn_logout_remove)) {
4344 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4345 iscsit_dec_conn_usage_count(conn);
4346 iscsit_dec_session_usage_count(sess);
4347 }
4348 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4349 iscsit_dec_conn_usage_count(conn);
4350
4351 atomic_set(&conn->conn_logout_remove, 0);
4352 atomic_set(&sess->session_reinstatement, 0);
4353 atomic_set(&sess->session_fall_back_to_erl0, 1);
4354 }
4355
4356 spin_lock_bh(&sess->conn_lock);
4357 list_del(&conn->conn_list);
4358
4359 /*
4360 * Attempt to let the Initiator know this connection failed by
4361 * sending an Connection Dropped Async Message on another
4362 * active connection.
4363 */
4364 if (atomic_read(&conn->connection_recovery))
4365 iscsit_build_conn_drop_async_message(conn);
4366
4367 spin_unlock_bh(&sess->conn_lock);
4368
4369 /*
4370 * If connection reinstatement is being performed on this connection,
4371 * up the connection reinstatement semaphore that is being blocked on
4372 * in iscsit_cause_connection_reinstatement().
4373 */
4374 spin_lock_bh(&conn->state_lock);
4375 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4376 spin_unlock_bh(&conn->state_lock);
4377 complete(&conn->conn_wait_comp);
4378 wait_for_completion(&conn->conn_post_wait_comp);
4379 spin_lock_bh(&conn->state_lock);
4380 }
4381
4382 /*
4383 * If connection reinstatement is being performed on this connection
4384 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4385 * connection wait rcfr semaphore that is being blocked on
4386 * an iscsit_connection_reinstatement_rcfr().
4387 */
4388 if (atomic_read(&conn->connection_wait_rcfr)) {
4389 spin_unlock_bh(&conn->state_lock);
4390 complete(&conn->conn_wait_rcfr_comp);
4391 wait_for_completion(&conn->conn_post_wait_comp);
4392 spin_lock_bh(&conn->state_lock);
4393 }
4394 atomic_set(&conn->connection_reinstatement, 1);
4395 spin_unlock_bh(&conn->state_lock);
4396
4397 /*
4398 * If any other processes are accessing this connection pointer we
4399 * must wait until they have completed.
4400 */
4401 iscsit_check_conn_usage_count(conn);
4402
4403 if (conn->conn_rx_hash.tfm)
4404 crypto_free_hash(conn->conn_rx_hash.tfm);
4405 if (conn->conn_tx_hash.tfm)
4406 crypto_free_hash(conn->conn_tx_hash.tfm);
4407
4408 free_cpumask_var(conn->conn_cpumask);
4409
4410 kfree(conn->conn_ops);
4411 conn->conn_ops = NULL;
4412
4413 if (conn->sock)
4414 sock_release(conn->sock);
4415
4416 if (conn->conn_transport->iscsit_free_conn)
4417 conn->conn_transport->iscsit_free_conn(conn);
4418
4419 iscsit_put_transport(conn->conn_transport);
4420
4421 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4422 conn->conn_state = TARG_CONN_STATE_FREE;
4423 kfree(conn);
4424
4425 spin_lock_bh(&sess->conn_lock);
4426 atomic_dec(&sess->nconn);
4427 pr_debug("Decremented iSCSI connection count to %hu from node:"
4428 " %s\n", atomic_read(&sess->nconn),
4429 sess->sess_ops->InitiatorName);
4430 /*
4431 * Make sure that if one connection fails in an non ERL=2 iSCSI
4432 * Session that they all fail.
4433 */
4434 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4435 !atomic_read(&sess->session_logout))
4436 atomic_set(&sess->session_fall_back_to_erl0, 1);
4437
4438 /*
4439 * If this was not the last connection in the session, and we are
4440 * performing session reinstatement or falling back to ERL=0, call
4441 * iscsit_stop_session() without sleeping to shutdown the other
4442 * active connections.
4443 */
4444 if (atomic_read(&sess->nconn)) {
4445 if (!atomic_read(&sess->session_reinstatement) &&
4446 !atomic_read(&sess->session_fall_back_to_erl0)) {
4447 spin_unlock_bh(&sess->conn_lock);
4448 return 0;
4449 }
4450 if (!atomic_read(&sess->session_stop_active)) {
4451 atomic_set(&sess->session_stop_active, 1);
4452 spin_unlock_bh(&sess->conn_lock);
4453 iscsit_stop_session(sess, 0, 0);
4454 return 0;
4455 }
4456 spin_unlock_bh(&sess->conn_lock);
4457 return 0;
4458 }
4459
4460 /*
4461 * If this was the last connection in the session and one of the
4462 * following is occurring:
4463 *
4464 * Session Reinstatement is not being performed, and are falling back
4465 * to ERL=0 call iscsit_close_session().
4466 *
4467 * Session Logout was requested. iscsit_close_session() will be called
4468 * elsewhere.
4469 *
4470 * Session Continuation is not being performed, start the Time2Retain
4471 * handler and check if sleep_on_sess_wait_sem is active.
4472 */
4473 if (!atomic_read(&sess->session_reinstatement) &&
4474 atomic_read(&sess->session_fall_back_to_erl0)) {
4475 spin_unlock_bh(&sess->conn_lock);
4476 target_put_session(sess->se_sess);
4477
4478 return 0;
4479 } else if (atomic_read(&sess->session_logout)) {
4480 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4481 sess->session_state = TARG_SESS_STATE_FREE;
4482 spin_unlock_bh(&sess->conn_lock);
4483
4484 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4485 complete(&sess->session_wait_comp);
4486
4487 return 0;
4488 } else {
4489 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4490 sess->session_state = TARG_SESS_STATE_FAILED;
4491
4492 if (!atomic_read(&sess->session_continuation)) {
4493 spin_unlock_bh(&sess->conn_lock);
4494 iscsit_start_time2retain_handler(sess);
4495 } else
4496 spin_unlock_bh(&sess->conn_lock);
4497
4498 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4499 complete(&sess->session_wait_comp);
4500
4501 return 0;
4502 }
4503 spin_unlock_bh(&sess->conn_lock);
4504
4505 return 0;
4506 }
4507
iscsit_close_session(struct iscsi_session * sess)4508 int iscsit_close_session(struct iscsi_session *sess)
4509 {
4510 struct iscsi_portal_group *tpg = sess->tpg;
4511 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4512
4513 if (atomic_read(&sess->nconn)) {
4514 pr_err("%d connection(s) still exist for iSCSI session"
4515 " to %s\n", atomic_read(&sess->nconn),
4516 sess->sess_ops->InitiatorName);
4517 BUG();
4518 }
4519
4520 spin_lock_bh(&se_tpg->session_lock);
4521 atomic_set(&sess->session_logout, 1);
4522 atomic_set(&sess->session_reinstatement, 1);
4523 iscsit_stop_time2retain_timer(sess);
4524 spin_unlock_bh(&se_tpg->session_lock);
4525
4526 /*
4527 * transport_deregister_session_configfs() will clear the
4528 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4529 * can be setting it again with __transport_register_session() in
4530 * iscsi_post_login_handler() again after the iscsit_stop_session()
4531 * completes in iscsi_np context.
4532 */
4533 transport_deregister_session_configfs(sess->se_sess);
4534
4535 /*
4536 * If any other processes are accessing this session pointer we must
4537 * wait until they have completed. If we are in an interrupt (the
4538 * time2retain handler) and contain and active session usage count we
4539 * restart the timer and exit.
4540 */
4541 if (!in_interrupt()) {
4542 if (iscsit_check_session_usage_count(sess) == 1)
4543 iscsit_stop_session(sess, 1, 1);
4544 } else {
4545 if (iscsit_check_session_usage_count(sess) == 2) {
4546 atomic_set(&sess->session_logout, 0);
4547 iscsit_start_time2retain_handler(sess);
4548 return 0;
4549 }
4550 }
4551
4552 transport_deregister_session(sess->se_sess);
4553
4554 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4555 iscsit_free_connection_recovery_entires(sess);
4556
4557 iscsit_free_all_ooo_cmdsns(sess);
4558
4559 spin_lock_bh(&se_tpg->session_lock);
4560 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4561 sess->session_state = TARG_SESS_STATE_FREE;
4562 pr_debug("Released iSCSI session from node: %s\n",
4563 sess->sess_ops->InitiatorName);
4564 tpg->nsessions--;
4565 if (tpg->tpg_tiqn)
4566 tpg->tpg_tiqn->tiqn_nsessions--;
4567
4568 pr_debug("Decremented number of active iSCSI Sessions on"
4569 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4570
4571 spin_lock(&sess_idr_lock);
4572 idr_remove(&sess_idr, sess->session_index);
4573 spin_unlock(&sess_idr_lock);
4574
4575 kfree(sess->sess_ops);
4576 sess->sess_ops = NULL;
4577 spin_unlock_bh(&se_tpg->session_lock);
4578
4579 kfree(sess);
4580 return 0;
4581 }
4582
iscsit_logout_post_handler_closesession(struct iscsi_conn * conn)4583 static void iscsit_logout_post_handler_closesession(
4584 struct iscsi_conn *conn)
4585 {
4586 struct iscsi_session *sess = conn->sess;
4587 int sleep = 1;
4588 /*
4589 * Traditional iscsi/tcp will invoke this logic from TX thread
4590 * context during session logout, so clear tx_thread_active and
4591 * sleep if iscsit_close_connection() has not already occured.
4592 *
4593 * Since iser-target invokes this logic from it's own workqueue,
4594 * always sleep waiting for RX/TX thread shutdown to complete
4595 * within iscsit_close_connection().
4596 */
4597 if (conn->conn_transport->transport_type == ISCSI_TCP) {
4598 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4599 if (!sleep)
4600 return;
4601 }
4602
4603 atomic_set(&conn->conn_logout_remove, 0);
4604 complete(&conn->conn_logout_comp);
4605
4606 iscsit_dec_conn_usage_count(conn);
4607 iscsit_stop_session(sess, sleep, sleep);
4608 iscsit_dec_session_usage_count(sess);
4609 target_put_session(sess->se_sess);
4610 }
4611
iscsit_logout_post_handler_samecid(struct iscsi_conn * conn)4612 static void iscsit_logout_post_handler_samecid(
4613 struct iscsi_conn *conn)
4614 {
4615 int sleep = 1;
4616
4617 if (conn->conn_transport->transport_type == ISCSI_TCP) {
4618 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4619 if (!sleep)
4620 return;
4621 }
4622
4623 atomic_set(&conn->conn_logout_remove, 0);
4624 complete(&conn->conn_logout_comp);
4625
4626 iscsit_cause_connection_reinstatement(conn, sleep);
4627 iscsit_dec_conn_usage_count(conn);
4628 }
4629
iscsit_logout_post_handler_diffcid(struct iscsi_conn * conn,u16 cid)4630 static void iscsit_logout_post_handler_diffcid(
4631 struct iscsi_conn *conn,
4632 u16 cid)
4633 {
4634 struct iscsi_conn *l_conn;
4635 struct iscsi_session *sess = conn->sess;
4636 bool conn_found = false;
4637
4638 if (!sess)
4639 return;
4640
4641 spin_lock_bh(&sess->conn_lock);
4642 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4643 if (l_conn->cid == cid) {
4644 iscsit_inc_conn_usage_count(l_conn);
4645 conn_found = true;
4646 break;
4647 }
4648 }
4649 spin_unlock_bh(&sess->conn_lock);
4650
4651 if (!conn_found)
4652 return;
4653
4654 if (l_conn->sock)
4655 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4656
4657 spin_lock_bh(&l_conn->state_lock);
4658 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4659 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4660 spin_unlock_bh(&l_conn->state_lock);
4661
4662 iscsit_cause_connection_reinstatement(l_conn, 1);
4663 iscsit_dec_conn_usage_count(l_conn);
4664 }
4665
4666 /*
4667 * Return of 0 causes the TX thread to restart.
4668 */
iscsit_logout_post_handler(struct iscsi_cmd * cmd,struct iscsi_conn * conn)4669 int iscsit_logout_post_handler(
4670 struct iscsi_cmd *cmd,
4671 struct iscsi_conn *conn)
4672 {
4673 int ret = 0;
4674
4675 switch (cmd->logout_reason) {
4676 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4677 switch (cmd->logout_response) {
4678 case ISCSI_LOGOUT_SUCCESS:
4679 case ISCSI_LOGOUT_CLEANUP_FAILED:
4680 default:
4681 iscsit_logout_post_handler_closesession(conn);
4682 break;
4683 }
4684 ret = 0;
4685 break;
4686 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4687 if (conn->cid == cmd->logout_cid) {
4688 switch (cmd->logout_response) {
4689 case ISCSI_LOGOUT_SUCCESS:
4690 case ISCSI_LOGOUT_CLEANUP_FAILED:
4691 default:
4692 iscsit_logout_post_handler_samecid(conn);
4693 break;
4694 }
4695 ret = 0;
4696 } else {
4697 switch (cmd->logout_response) {
4698 case ISCSI_LOGOUT_SUCCESS:
4699 iscsit_logout_post_handler_diffcid(conn,
4700 cmd->logout_cid);
4701 break;
4702 case ISCSI_LOGOUT_CID_NOT_FOUND:
4703 case ISCSI_LOGOUT_CLEANUP_FAILED:
4704 default:
4705 break;
4706 }
4707 ret = 1;
4708 }
4709 break;
4710 case ISCSI_LOGOUT_REASON_RECOVERY:
4711 switch (cmd->logout_response) {
4712 case ISCSI_LOGOUT_SUCCESS:
4713 case ISCSI_LOGOUT_CID_NOT_FOUND:
4714 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4715 case ISCSI_LOGOUT_CLEANUP_FAILED:
4716 default:
4717 break;
4718 }
4719 ret = 1;
4720 break;
4721 default:
4722 break;
4723
4724 }
4725 return ret;
4726 }
4727 EXPORT_SYMBOL(iscsit_logout_post_handler);
4728
iscsit_fail_session(struct iscsi_session * sess)4729 void iscsit_fail_session(struct iscsi_session *sess)
4730 {
4731 struct iscsi_conn *conn;
4732
4733 spin_lock_bh(&sess->conn_lock);
4734 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4735 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4736 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4737 }
4738 spin_unlock_bh(&sess->conn_lock);
4739
4740 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4741 sess->session_state = TARG_SESS_STATE_FAILED;
4742 }
4743
iscsit_free_session(struct iscsi_session * sess)4744 int iscsit_free_session(struct iscsi_session *sess)
4745 {
4746 u16 conn_count = atomic_read(&sess->nconn);
4747 struct iscsi_conn *conn, *conn_tmp = NULL;
4748 int is_last;
4749
4750 spin_lock_bh(&sess->conn_lock);
4751 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4752
4753 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4754 conn_list) {
4755 if (conn_count == 0)
4756 break;
4757
4758 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4759 is_last = 1;
4760 } else {
4761 iscsit_inc_conn_usage_count(conn_tmp);
4762 is_last = 0;
4763 }
4764 iscsit_inc_conn_usage_count(conn);
4765
4766 spin_unlock_bh(&sess->conn_lock);
4767 iscsit_cause_connection_reinstatement(conn, 1);
4768 spin_lock_bh(&sess->conn_lock);
4769
4770 iscsit_dec_conn_usage_count(conn);
4771 if (is_last == 0)
4772 iscsit_dec_conn_usage_count(conn_tmp);
4773
4774 conn_count--;
4775 }
4776
4777 if (atomic_read(&sess->nconn)) {
4778 spin_unlock_bh(&sess->conn_lock);
4779 wait_for_completion(&sess->session_wait_comp);
4780 } else
4781 spin_unlock_bh(&sess->conn_lock);
4782
4783 target_put_session(sess->se_sess);
4784 return 0;
4785 }
4786
iscsit_stop_session(struct iscsi_session * sess,int session_sleep,int connection_sleep)4787 void iscsit_stop_session(
4788 struct iscsi_session *sess,
4789 int session_sleep,
4790 int connection_sleep)
4791 {
4792 u16 conn_count = atomic_read(&sess->nconn);
4793 struct iscsi_conn *conn, *conn_tmp = NULL;
4794 int is_last;
4795
4796 spin_lock_bh(&sess->conn_lock);
4797 if (session_sleep)
4798 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4799
4800 if (connection_sleep) {
4801 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4802 conn_list) {
4803 if (conn_count == 0)
4804 break;
4805
4806 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4807 is_last = 1;
4808 } else {
4809 iscsit_inc_conn_usage_count(conn_tmp);
4810 is_last = 0;
4811 }
4812 iscsit_inc_conn_usage_count(conn);
4813
4814 spin_unlock_bh(&sess->conn_lock);
4815 iscsit_cause_connection_reinstatement(conn, 1);
4816 spin_lock_bh(&sess->conn_lock);
4817
4818 iscsit_dec_conn_usage_count(conn);
4819 if (is_last == 0)
4820 iscsit_dec_conn_usage_count(conn_tmp);
4821 conn_count--;
4822 }
4823 } else {
4824 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4825 iscsit_cause_connection_reinstatement(conn, 0);
4826 }
4827
4828 if (session_sleep && atomic_read(&sess->nconn)) {
4829 spin_unlock_bh(&sess->conn_lock);
4830 wait_for_completion(&sess->session_wait_comp);
4831 } else
4832 spin_unlock_bh(&sess->conn_lock);
4833 }
4834
iscsit_release_sessions_for_tpg(struct iscsi_portal_group * tpg,int force)4835 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4836 {
4837 struct iscsi_session *sess;
4838 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4839 struct se_session *se_sess, *se_sess_tmp;
4840 LIST_HEAD(free_list);
4841 int session_count = 0;
4842
4843 spin_lock_bh(&se_tpg->session_lock);
4844 if (tpg->nsessions && !force) {
4845 spin_unlock_bh(&se_tpg->session_lock);
4846 return -1;
4847 }
4848
4849 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4850 sess_list) {
4851 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4852
4853 spin_lock(&sess->conn_lock);
4854 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4855 atomic_read(&sess->session_logout) ||
4856 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4857 spin_unlock(&sess->conn_lock);
4858 continue;
4859 }
4860 atomic_set(&sess->session_reinstatement, 1);
4861 atomic_set(&sess->session_fall_back_to_erl0, 1);
4862 spin_unlock(&sess->conn_lock);
4863
4864 list_move_tail(&se_sess->sess_list, &free_list);
4865 }
4866 spin_unlock_bh(&se_tpg->session_lock);
4867
4868 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4869 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4870
4871 iscsit_free_session(sess);
4872 session_count++;
4873 }
4874
4875 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4876 " Group: %hu\n", session_count, tpg->tpgt);
4877 return 0;
4878 }
4879
4880 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4881 MODULE_VERSION("4.1.x");
4882 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4883 MODULE_LICENSE("GPL");
4884
4885 module_init(iscsi_target_init_module);
4886 module_exit(iscsi_target_cleanup_module);
4887