1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
5 *
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
7 *
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
20
21 #include <linux/string.h>
22 #include <linux/kthread.h>
23 #include <linux/crypto.h>
24 #include <linux/completion.h>
25 #include <linux/module.h>
26 #include <asm/unaligned.h>
27 #include <scsi/scsi_device.h>
28 #include <scsi/iscsi_proto.h>
29 #include <target/target_core_base.h>
30 #include <target/target_core_fabric.h>
31
32 #include "iscsi_target_core.h"
33 #include "iscsi_target_parameters.h"
34 #include "iscsi_target_seq_pdu_list.h"
35 #include "iscsi_target_tq.h"
36 #include "iscsi_target_configfs.h"
37 #include "iscsi_target_datain_values.h"
38 #include "iscsi_target_erl0.h"
39 #include "iscsi_target_erl1.h"
40 #include "iscsi_target_erl2.h"
41 #include "iscsi_target_login.h"
42 #include "iscsi_target_tmr.h"
43 #include "iscsi_target_tpg.h"
44 #include "iscsi_target_util.h"
45 #include "iscsi_target.h"
46 #include "iscsi_target_device.h"
47 #include "iscsi_target_stat.h"
48
49 static LIST_HEAD(g_tiqn_list);
50 static LIST_HEAD(g_np_list);
51 static DEFINE_SPINLOCK(tiqn_lock);
52 static DEFINE_SPINLOCK(np_lock);
53
54 static struct idr tiqn_idr;
55 struct idr sess_idr;
56 struct mutex auth_id_lock;
57 spinlock_t sess_idr_lock;
58
59 struct iscsit_global *iscsit_global;
60
61 struct kmem_cache *lio_cmd_cache;
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 unsigned char *buf, u32);
69 static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
70
iscsit_get_tiqn_for_login(unsigned char * buf)71 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
72 {
73 struct iscsi_tiqn *tiqn = NULL;
74
75 spin_lock(&tiqn_lock);
76 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
77 if (!strcmp(tiqn->tiqn, buf)) {
78
79 spin_lock(&tiqn->tiqn_state_lock);
80 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
81 tiqn->tiqn_access_count++;
82 spin_unlock(&tiqn->tiqn_state_lock);
83 spin_unlock(&tiqn_lock);
84 return tiqn;
85 }
86 spin_unlock(&tiqn->tiqn_state_lock);
87 }
88 }
89 spin_unlock(&tiqn_lock);
90
91 return NULL;
92 }
93
iscsit_set_tiqn_shutdown(struct iscsi_tiqn * tiqn)94 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
95 {
96 spin_lock(&tiqn->tiqn_state_lock);
97 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
98 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
99 spin_unlock(&tiqn->tiqn_state_lock);
100 return 0;
101 }
102 spin_unlock(&tiqn->tiqn_state_lock);
103
104 return -1;
105 }
106
iscsit_put_tiqn_for_login(struct iscsi_tiqn * tiqn)107 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
108 {
109 spin_lock(&tiqn->tiqn_state_lock);
110 tiqn->tiqn_access_count--;
111 spin_unlock(&tiqn->tiqn_state_lock);
112 }
113
114 /*
115 * Note that IQN formatting is expected to be done in userspace, and
116 * no explict IQN format checks are done here.
117 */
iscsit_add_tiqn(unsigned char * buf)118 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
119 {
120 struct iscsi_tiqn *tiqn = NULL;
121 int ret;
122
123 if (strlen(buf) >= ISCSI_IQN_LEN) {
124 pr_err("Target IQN exceeds %d bytes\n",
125 ISCSI_IQN_LEN);
126 return ERR_PTR(-EINVAL);
127 }
128
129 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
130 if (!tiqn) {
131 pr_err("Unable to allocate struct iscsi_tiqn\n");
132 return ERR_PTR(-ENOMEM);
133 }
134
135 sprintf(tiqn->tiqn, "%s", buf);
136 INIT_LIST_HEAD(&tiqn->tiqn_list);
137 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
138 spin_lock_init(&tiqn->tiqn_state_lock);
139 spin_lock_init(&tiqn->tiqn_tpg_lock);
140 spin_lock_init(&tiqn->sess_err_stats.lock);
141 spin_lock_init(&tiqn->login_stats.lock);
142 spin_lock_init(&tiqn->logout_stats.lock);
143
144 if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) {
145 pr_err("idr_pre_get() for tiqn_idr failed\n");
146 kfree(tiqn);
147 return ERR_PTR(-ENOMEM);
148 }
149 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
150
151 spin_lock(&tiqn_lock);
152 ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index);
153 if (ret < 0) {
154 pr_err("idr_get_new() failed for tiqn->tiqn_index\n");
155 spin_unlock(&tiqn_lock);
156 kfree(tiqn);
157 return ERR_PTR(ret);
158 }
159 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
160 spin_unlock(&tiqn_lock);
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 if (np->np_login_tpg) {
219 pr_err("np->np_login_tpg() is not NULL!\n");
220 spin_unlock_bh(&np->np_thread_lock);
221 return -1;
222 }
223 spin_unlock_bh(&np->np_thread_lock);
224 /*
225 * Determine if the portal group is accepting storage traffic.
226 */
227 spin_lock_bh(&tpg->tpg_state_lock);
228 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
229 spin_unlock_bh(&tpg->tpg_state_lock);
230 return -1;
231 }
232 spin_unlock_bh(&tpg->tpg_state_lock);
233
234 /*
235 * Here we serialize access across the TIQN+TPG Tuple.
236 */
237 ret = mutex_lock_interruptible(&tpg->np_login_lock);
238 if ((ret != 0) || signal_pending(current))
239 return -1;
240
241 spin_lock_bh(&np->np_thread_lock);
242 np->np_login_tpg = tpg;
243 spin_unlock_bh(&np->np_thread_lock);
244
245 return 0;
246 }
247
iscsit_deaccess_np(struct iscsi_np * np,struct iscsi_portal_group * tpg)248 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
249 {
250 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
251
252 spin_lock_bh(&np->np_thread_lock);
253 np->np_login_tpg = NULL;
254 spin_unlock_bh(&np->np_thread_lock);
255
256 mutex_unlock(&tpg->np_login_lock);
257
258 if (tiqn)
259 iscsit_put_tiqn_for_login(tiqn);
260
261 return 0;
262 }
263
iscsit_get_np(struct __kernel_sockaddr_storage * sockaddr,int network_transport)264 static struct iscsi_np *iscsit_get_np(
265 struct __kernel_sockaddr_storage *sockaddr,
266 int network_transport)
267 {
268 struct sockaddr_in *sock_in, *sock_in_e;
269 struct sockaddr_in6 *sock_in6, *sock_in6_e;
270 struct iscsi_np *np;
271 int ip_match = 0;
272 u16 port;
273
274 spin_lock_bh(&np_lock);
275 list_for_each_entry(np, &g_np_list, np_list) {
276 spin_lock(&np->np_thread_lock);
277 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
278 spin_unlock(&np->np_thread_lock);
279 continue;
280 }
281
282 if (sockaddr->ss_family == AF_INET6) {
283 sock_in6 = (struct sockaddr_in6 *)sockaddr;
284 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
285
286 if (!memcmp(&sock_in6->sin6_addr.in6_u,
287 &sock_in6_e->sin6_addr.in6_u,
288 sizeof(struct in6_addr)))
289 ip_match = 1;
290
291 port = ntohs(sock_in6->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 ==
297 sock_in_e->sin_addr.s_addr)
298 ip_match = 1;
299
300 port = ntohs(sock_in->sin_port);
301 }
302
303 if ((ip_match == 1) && (np->np_port == port) &&
304 (np->np_network_transport == network_transport)) {
305 /*
306 * Increment the np_exports reference count now to
307 * prevent iscsit_del_np() below from being called
308 * while iscsi_tpg_add_network_portal() is called.
309 */
310 np->np_exports++;
311 spin_unlock(&np->np_thread_lock);
312 spin_unlock_bh(&np_lock);
313 return np;
314 }
315 spin_unlock(&np->np_thread_lock);
316 }
317 spin_unlock_bh(&np_lock);
318
319 return NULL;
320 }
321
iscsit_add_np(struct __kernel_sockaddr_storage * sockaddr,char * ip_str,int network_transport)322 struct iscsi_np *iscsit_add_np(
323 struct __kernel_sockaddr_storage *sockaddr,
324 char *ip_str,
325 int network_transport)
326 {
327 struct sockaddr_in *sock_in;
328 struct sockaddr_in6 *sock_in6;
329 struct iscsi_np *np;
330 int ret;
331 /*
332 * Locate the existing struct iscsi_np if already active..
333 */
334 np = iscsit_get_np(sockaddr, network_transport);
335 if (np)
336 return np;
337
338 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
339 if (!np) {
340 pr_err("Unable to allocate memory for struct iscsi_np\n");
341 return ERR_PTR(-ENOMEM);
342 }
343
344 np->np_flags |= NPF_IP_NETWORK;
345 if (sockaddr->ss_family == AF_INET6) {
346 sock_in6 = (struct sockaddr_in6 *)sockaddr;
347 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
348 np->np_port = ntohs(sock_in6->sin6_port);
349 } else {
350 sock_in = (struct sockaddr_in *)sockaddr;
351 sprintf(np->np_ip, "%s", ip_str);
352 np->np_port = ntohs(sock_in->sin_port);
353 }
354
355 np->np_network_transport = network_transport;
356 spin_lock_init(&np->np_thread_lock);
357 init_completion(&np->np_restart_comp);
358 INIT_LIST_HEAD(&np->np_list);
359
360 ret = iscsi_target_setup_login_socket(np, sockaddr);
361 if (ret != 0) {
362 kfree(np);
363 return ERR_PTR(ret);
364 }
365
366 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
367 if (IS_ERR(np->np_thread)) {
368 pr_err("Unable to create kthread: iscsi_np\n");
369 ret = PTR_ERR(np->np_thread);
370 kfree(np);
371 return ERR_PTR(ret);
372 }
373 /*
374 * Increment the np_exports reference count now to prevent
375 * iscsit_del_np() below from being run while a new call to
376 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
377 * active. We don't need to hold np->np_thread_lock at this
378 * point because iscsi_np has not been added to g_np_list yet.
379 */
380 np->np_exports = 1;
381
382 spin_lock_bh(&np_lock);
383 list_add_tail(&np->np_list, &g_np_list);
384 spin_unlock_bh(&np_lock);
385
386 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
387 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
388 "TCP" : "SCTP");
389
390 return np;
391 }
392
iscsit_reset_np_thread(struct iscsi_np * np,struct iscsi_tpg_np * tpg_np,struct iscsi_portal_group * tpg)393 int iscsit_reset_np_thread(
394 struct iscsi_np *np,
395 struct iscsi_tpg_np *tpg_np,
396 struct iscsi_portal_group *tpg)
397 {
398 spin_lock_bh(&np->np_thread_lock);
399 if (tpg && tpg_np) {
400 /*
401 * The reset operation need only be performed when the
402 * passed struct iscsi_portal_group has a login in progress
403 * to one of the network portals.
404 */
405 if (tpg_np->tpg_np->np_login_tpg != tpg) {
406 spin_unlock_bh(&np->np_thread_lock);
407 return 0;
408 }
409 }
410 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
411 spin_unlock_bh(&np->np_thread_lock);
412 return 0;
413 }
414 np->np_thread_state = ISCSI_NP_THREAD_RESET;
415
416 if (np->np_thread) {
417 spin_unlock_bh(&np->np_thread_lock);
418 send_sig(SIGINT, np->np_thread, 1);
419 wait_for_completion(&np->np_restart_comp);
420 spin_lock_bh(&np->np_thread_lock);
421 }
422 spin_unlock_bh(&np->np_thread_lock);
423
424 return 0;
425 }
426
iscsit_del_np_comm(struct iscsi_np * np)427 int iscsit_del_np_comm(struct iscsi_np *np)
428 {
429 if (!np->np_socket)
430 return 0;
431
432 /*
433 * Some network transports allocate their own struct sock->file,
434 * see if we need to free any additional allocated resources.
435 */
436 if (np->np_flags & NPF_SCTP_STRUCT_FILE) {
437 kfree(np->np_socket->file);
438 np->np_socket->file = NULL;
439 }
440
441 sock_release(np->np_socket);
442 return 0;
443 }
444
iscsit_del_np(struct iscsi_np * np)445 int iscsit_del_np(struct iscsi_np *np)
446 {
447 spin_lock_bh(&np->np_thread_lock);
448 np->np_exports--;
449 if (np->np_exports) {
450 spin_unlock_bh(&np->np_thread_lock);
451 return 0;
452 }
453 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
454 spin_unlock_bh(&np->np_thread_lock);
455
456 if (np->np_thread) {
457 /*
458 * We need to send the signal to wakeup Linux/Net
459 * which may be sleeping in sock_accept()..
460 */
461 send_sig(SIGINT, np->np_thread, 1);
462 kthread_stop(np->np_thread);
463 }
464 iscsit_del_np_comm(np);
465
466 spin_lock_bh(&np_lock);
467 list_del(&np->np_list);
468 spin_unlock_bh(&np_lock);
469
470 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
471 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
472 "TCP" : "SCTP");
473
474 kfree(np);
475 return 0;
476 }
477
iscsi_target_init_module(void)478 static int __init iscsi_target_init_module(void)
479 {
480 int ret = 0;
481
482 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
483
484 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
485 if (!iscsit_global) {
486 pr_err("Unable to allocate memory for iscsit_global\n");
487 return -1;
488 }
489 mutex_init(&auth_id_lock);
490 spin_lock_init(&sess_idr_lock);
491 idr_init(&tiqn_idr);
492 idr_init(&sess_idr);
493
494 ret = iscsi_target_register_configfs();
495 if (ret < 0)
496 goto out;
497
498 ret = iscsi_thread_set_init();
499 if (ret < 0)
500 goto configfs_out;
501
502 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
503 TARGET_THREAD_SET_COUNT) {
504 pr_err("iscsi_allocate_thread_sets() returned"
505 " unexpected value!\n");
506 goto ts_out1;
507 }
508
509 lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
510 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
511 0, NULL);
512 if (!lio_cmd_cache) {
513 pr_err("Unable to kmem_cache_create() for"
514 " lio_cmd_cache\n");
515 goto ts_out2;
516 }
517
518 lio_qr_cache = kmem_cache_create("lio_qr_cache",
519 sizeof(struct iscsi_queue_req),
520 __alignof__(struct iscsi_queue_req), 0, NULL);
521 if (!lio_qr_cache) {
522 pr_err("nable to kmem_cache_create() for"
523 " lio_qr_cache\n");
524 goto cmd_out;
525 }
526
527 lio_dr_cache = kmem_cache_create("lio_dr_cache",
528 sizeof(struct iscsi_datain_req),
529 __alignof__(struct iscsi_datain_req), 0, NULL);
530 if (!lio_dr_cache) {
531 pr_err("Unable to kmem_cache_create() for"
532 " lio_dr_cache\n");
533 goto qr_out;
534 }
535
536 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
537 sizeof(struct iscsi_ooo_cmdsn),
538 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
539 if (!lio_ooo_cache) {
540 pr_err("Unable to kmem_cache_create() for"
541 " lio_ooo_cache\n");
542 goto dr_out;
543 }
544
545 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
546 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
547 0, NULL);
548 if (!lio_r2t_cache) {
549 pr_err("Unable to kmem_cache_create() for"
550 " lio_r2t_cache\n");
551 goto ooo_out;
552 }
553
554 if (iscsit_load_discovery_tpg() < 0)
555 goto r2t_out;
556
557 return ret;
558 r2t_out:
559 kmem_cache_destroy(lio_r2t_cache);
560 ooo_out:
561 kmem_cache_destroy(lio_ooo_cache);
562 dr_out:
563 kmem_cache_destroy(lio_dr_cache);
564 qr_out:
565 kmem_cache_destroy(lio_qr_cache);
566 cmd_out:
567 kmem_cache_destroy(lio_cmd_cache);
568 ts_out2:
569 iscsi_deallocate_thread_sets();
570 ts_out1:
571 iscsi_thread_set_free();
572 configfs_out:
573 iscsi_target_deregister_configfs();
574 out:
575 kfree(iscsit_global);
576 return -ENOMEM;
577 }
578
iscsi_target_cleanup_module(void)579 static void __exit iscsi_target_cleanup_module(void)
580 {
581 iscsi_deallocate_thread_sets();
582 iscsi_thread_set_free();
583 iscsit_release_discovery_tpg();
584 kmem_cache_destroy(lio_cmd_cache);
585 kmem_cache_destroy(lio_qr_cache);
586 kmem_cache_destroy(lio_dr_cache);
587 kmem_cache_destroy(lio_ooo_cache);
588 kmem_cache_destroy(lio_r2t_cache);
589
590 iscsi_target_deregister_configfs();
591
592 kfree(iscsit_global);
593 }
594
iscsit_add_reject(u8 reason,int fail_conn,unsigned char * buf,struct iscsi_conn * conn)595 int iscsit_add_reject(
596 u8 reason,
597 int fail_conn,
598 unsigned char *buf,
599 struct iscsi_conn *conn)
600 {
601 struct iscsi_cmd *cmd;
602 struct iscsi_reject *hdr;
603 int ret;
604
605 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
606 if (!cmd)
607 return -1;
608
609 cmd->iscsi_opcode = ISCSI_OP_REJECT;
610 if (fail_conn)
611 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
612
613 hdr = (struct iscsi_reject *) cmd->pdu;
614 hdr->reason = reason;
615
616 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
617 if (!cmd->buf_ptr) {
618 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
619 iscsit_release_cmd(cmd);
620 return -1;
621 }
622
623 spin_lock_bh(&conn->cmd_lock);
624 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
625 spin_unlock_bh(&conn->cmd_lock);
626
627 cmd->i_state = ISTATE_SEND_REJECT;
628 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
629
630 ret = wait_for_completion_interruptible(&cmd->reject_comp);
631 if (ret != 0)
632 return -1;
633
634 return (!fail_conn) ? 0 : -1;
635 }
636
iscsit_add_reject_from_cmd(u8 reason,int fail_conn,int add_to_conn,unsigned char * buf,struct iscsi_cmd * cmd)637 int iscsit_add_reject_from_cmd(
638 u8 reason,
639 int fail_conn,
640 int add_to_conn,
641 unsigned char *buf,
642 struct iscsi_cmd *cmd)
643 {
644 struct iscsi_conn *conn;
645 struct iscsi_reject *hdr;
646 int ret;
647
648 if (!cmd->conn) {
649 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
650 cmd->init_task_tag);
651 return -1;
652 }
653 conn = cmd->conn;
654
655 cmd->iscsi_opcode = ISCSI_OP_REJECT;
656 if (fail_conn)
657 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
658
659 hdr = (struct iscsi_reject *) cmd->pdu;
660 hdr->reason = reason;
661
662 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
663 if (!cmd->buf_ptr) {
664 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
665 iscsit_release_cmd(cmd);
666 return -1;
667 }
668
669 if (add_to_conn) {
670 spin_lock_bh(&conn->cmd_lock);
671 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
672 spin_unlock_bh(&conn->cmd_lock);
673 }
674
675 cmd->i_state = ISTATE_SEND_REJECT;
676 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
677
678 ret = wait_for_completion_interruptible(&cmd->reject_comp);
679 if (ret != 0)
680 return -1;
681
682 return (!fail_conn) ? 0 : -1;
683 }
684
685 /*
686 * Map some portion of the allocated scatterlist to an iovec, suitable for
687 * kernel sockets to copy data in/out. This handles both pages and slab-allocated
688 * buffers, since we have been tricky and mapped t_mem_sg to the buffer in
689 * either case (see iscsit_alloc_buffs)
690 */
iscsit_map_iovec(struct iscsi_cmd * cmd,struct kvec * iov,u32 data_offset,u32 data_length)691 static int iscsit_map_iovec(
692 struct iscsi_cmd *cmd,
693 struct kvec *iov,
694 u32 data_offset,
695 u32 data_length)
696 {
697 u32 i = 0;
698 struct scatterlist *sg;
699 unsigned int page_off;
700
701 /*
702 * We have a private mapping of the allocated pages in t_mem_sg.
703 * At this point, we also know each contains a page.
704 */
705 sg = &cmd->t_mem_sg[data_offset / PAGE_SIZE];
706 page_off = (data_offset % PAGE_SIZE);
707
708 cmd->first_data_sg = sg;
709 cmd->first_data_sg_off = page_off;
710
711 while (data_length) {
712 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
713
714 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
715 iov[i].iov_len = cur_len;
716
717 data_length -= cur_len;
718 page_off = 0;
719 sg = sg_next(sg);
720 i++;
721 }
722
723 cmd->kmapped_nents = i;
724
725 return i;
726 }
727
iscsit_unmap_iovec(struct iscsi_cmd * cmd)728 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
729 {
730 u32 i;
731 struct scatterlist *sg;
732
733 sg = cmd->first_data_sg;
734
735 for (i = 0; i < cmd->kmapped_nents; i++)
736 kunmap(sg_page(&sg[i]));
737 }
738
iscsit_ack_from_expstatsn(struct iscsi_conn * conn,u32 exp_statsn)739 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
740 {
741 struct iscsi_cmd *cmd;
742
743 conn->exp_statsn = exp_statsn;
744
745 spin_lock_bh(&conn->cmd_lock);
746 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
747 spin_lock(&cmd->istate_lock);
748 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
749 (cmd->stat_sn < exp_statsn)) {
750 cmd->i_state = ISTATE_REMOVE;
751 spin_unlock(&cmd->istate_lock);
752 iscsit_add_cmd_to_immediate_queue(cmd, conn,
753 cmd->i_state);
754 continue;
755 }
756 spin_unlock(&cmd->istate_lock);
757 }
758 spin_unlock_bh(&conn->cmd_lock);
759 }
760
iscsit_allocate_iovecs(struct iscsi_cmd * cmd)761 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
762 {
763 u32 iov_count = (cmd->se_cmd.t_data_nents == 0) ? 1 :
764 cmd->se_cmd.t_data_nents;
765
766 iov_count += ISCSI_IOV_DATA_BUFFER;
767
768 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
769 if (!cmd->iov_data) {
770 pr_err("Unable to allocate cmd->iov_data\n");
771 return -ENOMEM;
772 }
773
774 cmd->orig_iov_data_count = iov_count;
775 return 0;
776 }
777
iscsit_alloc_buffs(struct iscsi_cmd * cmd)778 static int iscsit_alloc_buffs(struct iscsi_cmd *cmd)
779 {
780 struct scatterlist *sgl;
781 u32 length = cmd->se_cmd.data_length;
782 int nents = DIV_ROUND_UP(length, PAGE_SIZE);
783 int i = 0, ret;
784 /*
785 * If no SCSI payload is present, allocate the default iovecs used for
786 * iSCSI PDU Header
787 */
788 if (!length)
789 return iscsit_allocate_iovecs(cmd);
790
791 sgl = kzalloc(sizeof(*sgl) * nents, GFP_KERNEL);
792 if (!sgl)
793 return -ENOMEM;
794
795 sg_init_table(sgl, nents);
796
797 while (length) {
798 int buf_size = min_t(int, length, PAGE_SIZE);
799 struct page *page;
800
801 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
802 if (!page)
803 goto page_alloc_failed;
804
805 sg_set_page(&sgl[i], page, buf_size, 0);
806
807 length -= buf_size;
808 i++;
809 }
810
811 cmd->t_mem_sg = sgl;
812 cmd->t_mem_sg_nents = nents;
813
814 /* BIDI ops not supported */
815
816 /* Tell the core about our preallocated memory */
817 transport_generic_map_mem_to_cmd(&cmd->se_cmd, sgl, nents, NULL, 0);
818 /*
819 * Allocate iovecs for SCSI payload after transport_generic_map_mem_to_cmd
820 * so that cmd->se_cmd.t_tasks_se_num has been set.
821 */
822 ret = iscsit_allocate_iovecs(cmd);
823 if (ret < 0)
824 goto page_alloc_failed;
825
826 return 0;
827
828 page_alloc_failed:
829 while (i >= 0) {
830 __free_page(sg_page(&sgl[i]));
831 i--;
832 }
833 kfree(cmd->t_mem_sg);
834 cmd->t_mem_sg = NULL;
835 return -ENOMEM;
836 }
837
iscsit_handle_scsi_cmd(struct iscsi_conn * conn,unsigned char * buf)838 static int iscsit_handle_scsi_cmd(
839 struct iscsi_conn *conn,
840 unsigned char *buf)
841 {
842 int data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
843 int dump_immediate_data = 0, send_check_condition = 0, payload_length;
844 struct iscsi_cmd *cmd = NULL;
845 struct iscsi_scsi_req *hdr;
846
847 spin_lock_bh(&conn->sess->session_stats_lock);
848 conn->sess->cmd_pdus++;
849 if (conn->sess->se_sess->se_node_acl) {
850 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
851 conn->sess->se_sess->se_node_acl->num_cmds++;
852 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
853 }
854 spin_unlock_bh(&conn->sess->session_stats_lock);
855
856 hdr = (struct iscsi_scsi_req *) buf;
857 payload_length = ntoh24(hdr->dlength);
858 hdr->itt = be32_to_cpu(hdr->itt);
859 hdr->data_length = be32_to_cpu(hdr->data_length);
860 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
861 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
862
863 /* FIXME; Add checks for AdditionalHeaderSegment */
864
865 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
866 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
867 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
868 " not set. Bad iSCSI Initiator.\n");
869 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
870 buf, conn);
871 }
872
873 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
874 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
875 /*
876 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
877 * that adds support for RESERVE/RELEASE. There is a bug
878 * add with this new functionality that sets R/W bits when
879 * neither CDB carries any READ or WRITE datapayloads.
880 */
881 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
882 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
883 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
884 goto done;
885 }
886
887 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
888 " set when Expected Data Transfer Length is 0 for"
889 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
890 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
891 buf, conn);
892 }
893 done:
894
895 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
896 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
897 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
898 " MUST be set if Expected Data Transfer Length is not 0."
899 " Bad iSCSI Initiator\n");
900 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
901 buf, conn);
902 }
903
904 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
905 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
906 pr_err("Bidirectional operations not supported!\n");
907 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
908 buf, conn);
909 }
910
911 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
912 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
913 " Scsi Command PDU.\n");
914 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
915 buf, conn);
916 }
917
918 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
919 pr_err("ImmediateData=No but DataSegmentLength=%u,"
920 " protocol error.\n", payload_length);
921 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
922 buf, conn);
923 }
924
925 if ((hdr->data_length == payload_length) &&
926 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
927 pr_err("Expected Data Transfer Length and Length of"
928 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
929 " bit is not set protocol error\n");
930 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
931 buf, conn);
932 }
933
934 if (payload_length > hdr->data_length) {
935 pr_err("DataSegmentLength: %u is greater than"
936 " EDTL: %u, protocol error.\n", payload_length,
937 hdr->data_length);
938 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
939 buf, conn);
940 }
941
942 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
943 pr_err("DataSegmentLength: %u is greater than"
944 " MaxRecvDataSegmentLength: %u, protocol error.\n",
945 payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
946 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
947 buf, conn);
948 }
949
950 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
951 pr_err("DataSegmentLength: %u is greater than"
952 " FirstBurstLength: %u, protocol error.\n",
953 payload_length, conn->sess->sess_ops->FirstBurstLength);
954 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
955 buf, conn);
956 }
957
958 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
959 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
960 DMA_NONE;
961
962 cmd = iscsit_allocate_se_cmd(conn, hdr->data_length, data_direction,
963 (hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK));
964 if (!cmd)
965 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
966 buf, conn);
967
968 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
969 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
970 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
971
972 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
973 cmd->i_state = ISTATE_NEW_CMD;
974 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
975 cmd->immediate_data = (payload_length) ? 1 : 0;
976 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
977 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
978 if (cmd->unsolicited_data)
979 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
980
981 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
982 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
983 spin_lock_bh(&conn->sess->ttt_lock);
984 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
985 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
986 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
987 spin_unlock_bh(&conn->sess->ttt_lock);
988 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
989 cmd->targ_xfer_tag = 0xFFFFFFFF;
990 cmd->cmd_sn = hdr->cmdsn;
991 cmd->exp_stat_sn = hdr->exp_statsn;
992 cmd->first_burst_len = payload_length;
993
994 if (cmd->data_direction == DMA_FROM_DEVICE) {
995 struct iscsi_datain_req *dr;
996
997 dr = iscsit_allocate_datain_req();
998 if (!dr)
999 return iscsit_add_reject_from_cmd(
1000 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1001 1, 1, buf, cmd);
1002
1003 iscsit_attach_datain_req(cmd, dr);
1004 }
1005
1006 /*
1007 * The CDB is going to an se_device_t.
1008 */
1009 ret = iscsit_get_lun_for_cmd(cmd, hdr->cdb,
1010 get_unaligned_le64(&hdr->lun));
1011 if (ret < 0) {
1012 if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
1013 pr_debug("Responding to non-acl'ed,"
1014 " non-existent or non-exported iSCSI LUN:"
1015 " 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
1016 }
1017 send_check_condition = 1;
1018 goto attach_cmd;
1019 }
1020 /*
1021 * The Initiator Node has access to the LUN (the addressing method
1022 * is handled inside of iscsit_get_lun_for_cmd()). Now it's time to
1023 * allocate 1->N transport tasks (depending on sector count and
1024 * maximum request size the physical HBA(s) can handle.
1025 */
1026 transport_ret = transport_generic_allocate_tasks(&cmd->se_cmd, hdr->cdb);
1027 if (transport_ret == -ENOMEM) {
1028 return iscsit_add_reject_from_cmd(
1029 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1030 1, 1, buf, cmd);
1031 } else if (transport_ret < 0) {
1032 /*
1033 * Unsupported SAM Opcode. CHECK_CONDITION will be sent
1034 * in iscsit_execute_cmd() during the CmdSN OOO Execution
1035 * Mechinism.
1036 */
1037 send_check_condition = 1;
1038 } else {
1039 cmd->data_length = cmd->se_cmd.data_length;
1040
1041 if (iscsit_decide_list_to_build(cmd, payload_length) < 0)
1042 return iscsit_add_reject_from_cmd(
1043 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1044 1, 1, buf, cmd);
1045 }
1046
1047 attach_cmd:
1048 spin_lock_bh(&conn->cmd_lock);
1049 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1050 spin_unlock_bh(&conn->cmd_lock);
1051 /*
1052 * Check if we need to delay processing because of ALUA
1053 * Active/NonOptimized primary access state..
1054 */
1055 core_alua_check_nonop_delay(&cmd->se_cmd);
1056 /*
1057 * Allocate and setup SGL used with transport_generic_map_mem_to_cmd().
1058 * also call iscsit_allocate_iovecs()
1059 */
1060 ret = iscsit_alloc_buffs(cmd);
1061 if (ret < 0)
1062 return iscsit_add_reject_from_cmd(
1063 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1064 1, 0, buf, cmd);
1065 /*
1066 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1067 * the Immediate Bit is not set, and no Immediate
1068 * Data is attached.
1069 *
1070 * A PDU/CmdSN carrying Immediate Data can only
1071 * be processed after the DataCRC has passed.
1072 * If the DataCRC fails, the CmdSN MUST NOT
1073 * be acknowledged. (See below)
1074 */
1075 if (!cmd->immediate_data) {
1076 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1077 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1078 return 0;
1079 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1080 return iscsit_add_reject_from_cmd(
1081 ISCSI_REASON_PROTOCOL_ERROR,
1082 1, 0, buf, cmd);
1083 }
1084
1085 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1086
1087 /*
1088 * If no Immediate Data is attached, it's OK to return now.
1089 */
1090 if (!cmd->immediate_data) {
1091 if (send_check_condition)
1092 return 0;
1093
1094 if (cmd->unsolicited_data) {
1095 iscsit_set_dataout_sequence_values(cmd);
1096
1097 spin_lock_bh(&cmd->dataout_timeout_lock);
1098 iscsit_start_dataout_timer(cmd, cmd->conn);
1099 spin_unlock_bh(&cmd->dataout_timeout_lock);
1100 }
1101
1102 return 0;
1103 }
1104
1105 /*
1106 * Early CHECK_CONDITIONs never make it to the transport processing
1107 * thread. They are processed in CmdSN order by
1108 * iscsit_check_received_cmdsn() below.
1109 */
1110 if (send_check_condition) {
1111 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1112 dump_immediate_data = 1;
1113 goto after_immediate_data;
1114 }
1115 /*
1116 * Call directly into transport_generic_new_cmd() to perform
1117 * the backend memory allocation.
1118 */
1119 ret = transport_generic_new_cmd(&cmd->se_cmd);
1120 if (ret < 0) {
1121 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1122 dump_immediate_data = 1;
1123 goto after_immediate_data;
1124 }
1125
1126 immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1127 after_immediate_data:
1128 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1129 /*
1130 * A PDU/CmdSN carrying Immediate Data passed
1131 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1132 * Immediate Bit is not set.
1133 */
1134 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1135 /*
1136 * Special case for Unsupported SAM WRITE Opcodes
1137 * and ImmediateData=Yes.
1138 */
1139 if (dump_immediate_data) {
1140 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1141 return -1;
1142 } else if (cmd->unsolicited_data) {
1143 iscsit_set_dataout_sequence_values(cmd);
1144
1145 spin_lock_bh(&cmd->dataout_timeout_lock);
1146 iscsit_start_dataout_timer(cmd, cmd->conn);
1147 spin_unlock_bh(&cmd->dataout_timeout_lock);
1148 }
1149
1150 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1151 return iscsit_add_reject_from_cmd(
1152 ISCSI_REASON_PROTOCOL_ERROR,
1153 1, 0, buf, cmd);
1154
1155 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1156 /*
1157 * Immediate Data failed DataCRC and ERL>=1,
1158 * silently drop this PDU and let the initiator
1159 * plug the CmdSN gap.
1160 *
1161 * FIXME: Send Unsolicited NOPIN with reserved
1162 * TTT here to help the initiator figure out
1163 * the missing CmdSN, although they should be
1164 * intelligent enough to determine the missing
1165 * CmdSN and issue a retry to plug the sequence.
1166 */
1167 cmd->i_state = ISTATE_REMOVE;
1168 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1169 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1170 return -1;
1171
1172 return 0;
1173 }
1174
iscsit_do_crypto_hash_sg(struct hash_desc * hash,struct iscsi_cmd * cmd,u32 data_offset,u32 data_length,u32 padding,u8 * pad_bytes)1175 static u32 iscsit_do_crypto_hash_sg(
1176 struct hash_desc *hash,
1177 struct iscsi_cmd *cmd,
1178 u32 data_offset,
1179 u32 data_length,
1180 u32 padding,
1181 u8 *pad_bytes)
1182 {
1183 u32 data_crc;
1184 u32 i;
1185 struct scatterlist *sg;
1186 unsigned int page_off;
1187
1188 crypto_hash_init(hash);
1189
1190 sg = cmd->first_data_sg;
1191 page_off = cmd->first_data_sg_off;
1192
1193 i = 0;
1194 while (data_length) {
1195 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1196
1197 crypto_hash_update(hash, &sg[i], cur_len);
1198
1199 data_length -= cur_len;
1200 page_off = 0;
1201 i++;
1202 }
1203
1204 if (padding) {
1205 struct scatterlist pad_sg;
1206
1207 sg_init_one(&pad_sg, pad_bytes, padding);
1208 crypto_hash_update(hash, &pad_sg, padding);
1209 }
1210 crypto_hash_final(hash, (u8 *) &data_crc);
1211
1212 return data_crc;
1213 }
1214
iscsit_do_crypto_hash_buf(struct hash_desc * hash,unsigned char * buf,u32 payload_length,u32 padding,u8 * pad_bytes,u8 * data_crc)1215 static void iscsit_do_crypto_hash_buf(
1216 struct hash_desc *hash,
1217 unsigned char *buf,
1218 u32 payload_length,
1219 u32 padding,
1220 u8 *pad_bytes,
1221 u8 *data_crc)
1222 {
1223 struct scatterlist sg;
1224
1225 crypto_hash_init(hash);
1226
1227 sg_init_one(&sg, buf, payload_length);
1228 crypto_hash_update(hash, &sg, payload_length);
1229
1230 if (padding) {
1231 sg_init_one(&sg, pad_bytes, padding);
1232 crypto_hash_update(hash, &sg, padding);
1233 }
1234 crypto_hash_final(hash, data_crc);
1235 }
1236
iscsit_handle_data_out(struct iscsi_conn * conn,unsigned char * buf)1237 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1238 {
1239 int iov_ret, ooo_cmdsn = 0, ret;
1240 u8 data_crc_failed = 0;
1241 u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1242 u32 rx_size = 0, payload_length;
1243 struct iscsi_cmd *cmd = NULL;
1244 struct se_cmd *se_cmd;
1245 struct iscsi_data *hdr;
1246 struct kvec *iov;
1247 unsigned long flags;
1248
1249 hdr = (struct iscsi_data *) buf;
1250 payload_length = ntoh24(hdr->dlength);
1251 hdr->itt = be32_to_cpu(hdr->itt);
1252 hdr->ttt = be32_to_cpu(hdr->ttt);
1253 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1254 hdr->datasn = be32_to_cpu(hdr->datasn);
1255 hdr->offset = be32_to_cpu(hdr->offset);
1256
1257 if (!payload_length) {
1258 pr_err("DataOUT payload is ZERO, protocol error.\n");
1259 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1260 buf, conn);
1261 }
1262
1263 /* iSCSI write */
1264 spin_lock_bh(&conn->sess->session_stats_lock);
1265 conn->sess->rx_data_octets += payload_length;
1266 if (conn->sess->se_sess->se_node_acl) {
1267 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1268 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1269 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1270 }
1271 spin_unlock_bh(&conn->sess->session_stats_lock);
1272
1273 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1274 pr_err("DataSegmentLength: %u is greater than"
1275 " MaxRecvDataSegmentLength: %u\n", payload_length,
1276 conn->conn_ops->MaxRecvDataSegmentLength);
1277 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1278 buf, conn);
1279 }
1280
1281 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1282 payload_length);
1283 if (!cmd)
1284 return 0;
1285
1286 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1287 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1288 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1289 payload_length, conn->cid);
1290
1291 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1292 pr_err("Command ITT: 0x%08x received DataOUT after"
1293 " last DataOUT received, dumping payload\n",
1294 cmd->init_task_tag);
1295 return iscsit_dump_data_payload(conn, payload_length, 1);
1296 }
1297
1298 if (cmd->data_direction != DMA_TO_DEVICE) {
1299 pr_err("Command ITT: 0x%08x received DataOUT for a"
1300 " NON-WRITE command.\n", cmd->init_task_tag);
1301 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1302 1, 0, buf, cmd);
1303 }
1304 se_cmd = &cmd->se_cmd;
1305 iscsit_mod_dataout_timer(cmd);
1306
1307 if ((hdr->offset + payload_length) > cmd->data_length) {
1308 pr_err("DataOut Offset: %u, Length %u greater than"
1309 " iSCSI Command EDTL %u, protocol error.\n",
1310 hdr->offset, payload_length, cmd->data_length);
1311 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1312 1, 0, buf, cmd);
1313 }
1314
1315 if (cmd->unsolicited_data) {
1316 int dump_unsolicited_data = 0;
1317
1318 if (conn->sess->sess_ops->InitialR2T) {
1319 pr_err("Received unexpected unsolicited data"
1320 " while InitialR2T=Yes, protocol error.\n");
1321 transport_send_check_condition_and_sense(&cmd->se_cmd,
1322 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1323 return -1;
1324 }
1325 /*
1326 * Special case for dealing with Unsolicited DataOUT
1327 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1328 * failures;
1329 */
1330
1331 /* Something's amiss if we're not in WRITE_PENDING state... */
1332 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1333 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1334 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1335
1336 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1337 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1338 (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION))
1339 dump_unsolicited_data = 1;
1340 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1341
1342 if (dump_unsolicited_data) {
1343 /*
1344 * Check if a delayed TASK_ABORTED status needs to
1345 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1346 * received with the unsolicitied data out.
1347 */
1348 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1349 iscsit_stop_dataout_timer(cmd);
1350
1351 transport_check_aborted_status(se_cmd,
1352 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1353 return iscsit_dump_data_payload(conn, payload_length, 1);
1354 }
1355 } else {
1356 /*
1357 * For the normal solicited data path:
1358 *
1359 * Check for a delayed TASK_ABORTED status and dump any
1360 * incoming data out payload if one exists. Also, when the
1361 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1362 * data out sequence, we decrement outstanding_r2ts. Once
1363 * outstanding_r2ts reaches zero, go ahead and send the delayed
1364 * TASK_ABORTED status.
1365 */
1366 if (atomic_read(&se_cmd->t_transport_aborted) != 0) {
1367 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1368 if (--cmd->outstanding_r2ts < 1) {
1369 iscsit_stop_dataout_timer(cmd);
1370 transport_check_aborted_status(
1371 se_cmd, 1);
1372 }
1373
1374 return iscsit_dump_data_payload(conn, payload_length, 1);
1375 }
1376 }
1377 /*
1378 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1379 * within-command recovery checks before receiving the payload.
1380 */
1381 ret = iscsit_check_pre_dataout(cmd, buf);
1382 if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1383 return 0;
1384 else if (ret == DATAOUT_CANNOT_RECOVER)
1385 return -1;
1386
1387 rx_size += payload_length;
1388 iov = &cmd->iov_data[0];
1389
1390 iov_ret = iscsit_map_iovec(cmd, iov, hdr->offset, payload_length);
1391 if (iov_ret < 0)
1392 return -1;
1393
1394 iov_count += iov_ret;
1395
1396 padding = ((-payload_length) & 3);
1397 if (padding != 0) {
1398 iov[iov_count].iov_base = cmd->pad_bytes;
1399 iov[iov_count++].iov_len = padding;
1400 rx_size += padding;
1401 pr_debug("Receiving %u padding bytes.\n", padding);
1402 }
1403
1404 if (conn->conn_ops->DataDigest) {
1405 iov[iov_count].iov_base = &checksum;
1406 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1407 rx_size += ISCSI_CRC_LEN;
1408 }
1409
1410 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1411
1412 iscsit_unmap_iovec(cmd);
1413
1414 if (rx_got != rx_size)
1415 return -1;
1416
1417 if (conn->conn_ops->DataDigest) {
1418 u32 data_crc;
1419
1420 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1421 hdr->offset, payload_length, padding,
1422 cmd->pad_bytes);
1423
1424 if (checksum != data_crc) {
1425 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1426 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1427 " does not match computed 0x%08x\n",
1428 hdr->itt, hdr->offset, payload_length,
1429 hdr->datasn, checksum, data_crc);
1430 data_crc_failed = 1;
1431 } else {
1432 pr_debug("Got CRC32C DataDigest 0x%08x for"
1433 " %u bytes of Data Out\n", checksum,
1434 payload_length);
1435 }
1436 }
1437 /*
1438 * Increment post receive data and CRC values or perform
1439 * within-command recovery.
1440 */
1441 ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1442 if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1443 return 0;
1444 else if (ret == DATAOUT_SEND_R2T) {
1445 iscsit_set_dataout_sequence_values(cmd);
1446 iscsit_build_r2ts_for_cmd(cmd, conn, 0);
1447 } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1448 /*
1449 * Handle extra special case for out of order
1450 * Unsolicited Data Out.
1451 */
1452 spin_lock_bh(&cmd->istate_lock);
1453 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1454 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1455 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1456 spin_unlock_bh(&cmd->istate_lock);
1457
1458 iscsit_stop_dataout_timer(cmd);
1459 return (!ooo_cmdsn) ? transport_generic_handle_data(
1460 &cmd->se_cmd) : 0;
1461 } else /* DATAOUT_CANNOT_RECOVER */
1462 return -1;
1463
1464 return 0;
1465 }
1466
iscsit_handle_nop_out(struct iscsi_conn * conn,unsigned char * buf)1467 static int iscsit_handle_nop_out(
1468 struct iscsi_conn *conn,
1469 unsigned char *buf)
1470 {
1471 unsigned char *ping_data = NULL;
1472 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1473 u32 checksum, data_crc, padding = 0, payload_length;
1474 u64 lun;
1475 struct iscsi_cmd *cmd = NULL;
1476 struct kvec *iov = NULL;
1477 struct iscsi_nopout *hdr;
1478
1479 hdr = (struct iscsi_nopout *) buf;
1480 payload_length = ntoh24(hdr->dlength);
1481 lun = get_unaligned_le64(&hdr->lun);
1482 hdr->itt = be32_to_cpu(hdr->itt);
1483 hdr->ttt = be32_to_cpu(hdr->ttt);
1484 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1485 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1486
1487 if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1488 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1489 " not set, protocol error.\n");
1490 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1491 buf, conn);
1492 }
1493
1494 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1495 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1496 " greater than MaxRecvDataSegmentLength: %u, protocol"
1497 " error.\n", payload_length,
1498 conn->conn_ops->MaxRecvDataSegmentLength);
1499 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1500 buf, conn);
1501 }
1502
1503 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1504 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1505 (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
1506 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1507 payload_length);
1508 /*
1509 * This is not a response to a Unsolicited NopIN, which means
1510 * it can either be a NOPOUT ping request (with a valid ITT),
1511 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1512 * Either way, make sure we allocate an struct iscsi_cmd, as both
1513 * can contain ping data.
1514 */
1515 if (hdr->ttt == 0xFFFFFFFF) {
1516 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1517 if (!cmd)
1518 return iscsit_add_reject(
1519 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1520 1, buf, conn);
1521
1522 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1523 cmd->i_state = ISTATE_SEND_NOPIN;
1524 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1525 1 : 0);
1526 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1527 cmd->targ_xfer_tag = 0xFFFFFFFF;
1528 cmd->cmd_sn = hdr->cmdsn;
1529 cmd->exp_stat_sn = hdr->exp_statsn;
1530 cmd->data_direction = DMA_NONE;
1531 }
1532
1533 if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
1534 rx_size = payload_length;
1535 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1536 if (!ping_data) {
1537 pr_err("Unable to allocate memory for"
1538 " NOPOUT ping data.\n");
1539 ret = -1;
1540 goto out;
1541 }
1542
1543 iov = &cmd->iov_misc[0];
1544 iov[niov].iov_base = ping_data;
1545 iov[niov++].iov_len = payload_length;
1546
1547 padding = ((-payload_length) & 3);
1548 if (padding != 0) {
1549 pr_debug("Receiving %u additional bytes"
1550 " for padding.\n", padding);
1551 iov[niov].iov_base = &cmd->pad_bytes;
1552 iov[niov++].iov_len = padding;
1553 rx_size += padding;
1554 }
1555 if (conn->conn_ops->DataDigest) {
1556 iov[niov].iov_base = &checksum;
1557 iov[niov++].iov_len = ISCSI_CRC_LEN;
1558 rx_size += ISCSI_CRC_LEN;
1559 }
1560
1561 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1562 if (rx_got != rx_size) {
1563 ret = -1;
1564 goto out;
1565 }
1566
1567 if (conn->conn_ops->DataDigest) {
1568 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1569 ping_data, payload_length,
1570 padding, cmd->pad_bytes,
1571 (u8 *)&data_crc);
1572
1573 if (checksum != data_crc) {
1574 pr_err("Ping data CRC32C DataDigest"
1575 " 0x%08x does not match computed 0x%08x\n",
1576 checksum, data_crc);
1577 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1578 pr_err("Unable to recover from"
1579 " NOPOUT Ping DataCRC failure while in"
1580 " ERL=0.\n");
1581 ret = -1;
1582 goto out;
1583 } else {
1584 /*
1585 * Silently drop this PDU and let the
1586 * initiator plug the CmdSN gap.
1587 */
1588 pr_debug("Dropping NOPOUT"
1589 " Command CmdSN: 0x%08x due to"
1590 " DataCRC error.\n", hdr->cmdsn);
1591 ret = 0;
1592 goto out;
1593 }
1594 } else {
1595 pr_debug("Got CRC32C DataDigest"
1596 " 0x%08x for %u bytes of ping data.\n",
1597 checksum, payload_length);
1598 }
1599 }
1600
1601 ping_data[payload_length] = '\0';
1602 /*
1603 * Attach ping data to struct iscsi_cmd->buf_ptr.
1604 */
1605 cmd->buf_ptr = ping_data;
1606 cmd->buf_ptr_size = payload_length;
1607
1608 pr_debug("Got %u bytes of NOPOUT ping"
1609 " data.\n", payload_length);
1610 pr_debug("Ping Data: \"%s\"\n", ping_data);
1611 }
1612
1613 if (hdr->itt != 0xFFFFFFFF) {
1614 if (!cmd) {
1615 pr_err("Checking CmdSN for NOPOUT,"
1616 " but cmd is NULL!\n");
1617 return -1;
1618 }
1619 /*
1620 * Initiator is expecting a NopIN ping reply,
1621 */
1622 spin_lock_bh(&conn->cmd_lock);
1623 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1624 spin_unlock_bh(&conn->cmd_lock);
1625
1626 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1627
1628 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1629 iscsit_add_cmd_to_response_queue(cmd, conn,
1630 cmd->i_state);
1631 return 0;
1632 }
1633
1634 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1635 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1636 ret = 0;
1637 goto ping_out;
1638 }
1639 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1640 return iscsit_add_reject_from_cmd(
1641 ISCSI_REASON_PROTOCOL_ERROR,
1642 1, 0, buf, cmd);
1643
1644 return 0;
1645 }
1646
1647 if (hdr->ttt != 0xFFFFFFFF) {
1648 /*
1649 * This was a response to a unsolicited NOPIN ping.
1650 */
1651 cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
1652 if (!cmd)
1653 return -1;
1654
1655 iscsit_stop_nopin_response_timer(conn);
1656
1657 cmd->i_state = ISTATE_REMOVE;
1658 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1659 iscsit_start_nopin_timer(conn);
1660 } else {
1661 /*
1662 * Initiator is not expecting a NOPIN is response.
1663 * Just ignore for now.
1664 *
1665 * iSCSI v19-91 10.18
1666 * "A NOP-OUT may also be used to confirm a changed
1667 * ExpStatSN if another PDU will not be available
1668 * for a long time."
1669 */
1670 ret = 0;
1671 goto out;
1672 }
1673
1674 return 0;
1675 out:
1676 if (cmd)
1677 iscsit_release_cmd(cmd);
1678 ping_out:
1679 kfree(ping_data);
1680 return ret;
1681 }
1682
iscsit_handle_task_mgt_cmd(struct iscsi_conn * conn,unsigned char * buf)1683 static int iscsit_handle_task_mgt_cmd(
1684 struct iscsi_conn *conn,
1685 unsigned char *buf)
1686 {
1687 struct iscsi_cmd *cmd;
1688 struct se_tmr_req *se_tmr;
1689 struct iscsi_tmr_req *tmr_req;
1690 struct iscsi_tm *hdr;
1691 u32 payload_length;
1692 int out_of_order_cmdsn = 0;
1693 int ret;
1694 u8 function;
1695
1696 hdr = (struct iscsi_tm *) buf;
1697 payload_length = ntoh24(hdr->dlength);
1698 hdr->itt = be32_to_cpu(hdr->itt);
1699 hdr->rtt = be32_to_cpu(hdr->rtt);
1700 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1701 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1702 hdr->refcmdsn = be32_to_cpu(hdr->refcmdsn);
1703 hdr->exp_datasn = be32_to_cpu(hdr->exp_datasn);
1704 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1705 function = hdr->flags;
1706
1707 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1708 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1709 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1710 hdr->rtt, hdr->refcmdsn, conn->cid);
1711
1712 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1713 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1714 (hdr->rtt != ISCSI_RESERVED_TAG))) {
1715 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1716 hdr->rtt = ISCSI_RESERVED_TAG;
1717 }
1718
1719 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1720 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1721 pr_err("Task Management Request TASK_REASSIGN not"
1722 " issued as immediate command, bad iSCSI Initiator"
1723 "implementation\n");
1724 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1725 buf, conn);
1726 }
1727 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1728 (hdr->refcmdsn != ISCSI_RESERVED_TAG))
1729 hdr->refcmdsn = ISCSI_RESERVED_TAG;
1730
1731 cmd = iscsit_allocate_se_cmd_for_tmr(conn, function);
1732 if (!cmd)
1733 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1734 1, buf, conn);
1735
1736 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1737 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1738 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1739 cmd->init_task_tag = hdr->itt;
1740 cmd->targ_xfer_tag = 0xFFFFFFFF;
1741 cmd->cmd_sn = hdr->cmdsn;
1742 cmd->exp_stat_sn = hdr->exp_statsn;
1743 se_tmr = cmd->se_cmd.se_tmr_req;
1744 tmr_req = cmd->tmr_req;
1745 /*
1746 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1747 */
1748 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1749 ret = iscsit_get_lun_for_tmr(cmd,
1750 get_unaligned_le64(&hdr->lun));
1751 if (ret < 0) {
1752 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1753 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1754 goto attach;
1755 }
1756 }
1757
1758 switch (function) {
1759 case ISCSI_TM_FUNC_ABORT_TASK:
1760 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1761 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1762 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1763 goto attach;
1764 }
1765 break;
1766 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1767 case ISCSI_TM_FUNC_CLEAR_ACA:
1768 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1769 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1770 break;
1771 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1772 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1773 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1774 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1775 goto attach;
1776 }
1777 break;
1778 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1779 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1780 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1781 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1782 goto attach;
1783 }
1784 break;
1785 case ISCSI_TM_FUNC_TASK_REASSIGN:
1786 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1787 /*
1788 * Perform sanity checks on the ExpDataSN only if the
1789 * TASK_REASSIGN was successful.
1790 */
1791 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1792 break;
1793
1794 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1795 return iscsit_add_reject_from_cmd(
1796 ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1797 buf, cmd);
1798 break;
1799 default:
1800 pr_err("Unknown TMR function: 0x%02x, protocol"
1801 " error.\n", function);
1802 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1803 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1804 goto attach;
1805 }
1806
1807 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1808 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1809 se_tmr->call_transport = 1;
1810 attach:
1811 spin_lock_bh(&conn->cmd_lock);
1812 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1813 spin_unlock_bh(&conn->cmd_lock);
1814
1815 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1816 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1817 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1818 out_of_order_cmdsn = 1;
1819 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1820 return 0;
1821 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1822 return iscsit_add_reject_from_cmd(
1823 ISCSI_REASON_PROTOCOL_ERROR,
1824 1, 0, buf, cmd);
1825 }
1826 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1827
1828 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1829 return 0;
1830 /*
1831 * Found the referenced task, send to transport for processing.
1832 */
1833 if (se_tmr->call_transport)
1834 return transport_generic_handle_tmr(&cmd->se_cmd);
1835
1836 /*
1837 * Could not find the referenced LUN, task, or Task Management
1838 * command not authorized or supported. Change state and
1839 * let the tx_thread send the response.
1840 *
1841 * For connection recovery, this is also the default action for
1842 * TMR TASK_REASSIGN.
1843 */
1844 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1845 return 0;
1846 }
1847
1848 /* #warning FIXME: Support Text Command parameters besides SendTargets */
iscsit_handle_text_cmd(struct iscsi_conn * conn,unsigned char * buf)1849 static int iscsit_handle_text_cmd(
1850 struct iscsi_conn *conn,
1851 unsigned char *buf)
1852 {
1853 char *text_ptr, *text_in;
1854 int cmdsn_ret, niov = 0, rx_got, rx_size;
1855 u32 checksum = 0, data_crc = 0, payload_length;
1856 u32 padding = 0, pad_bytes = 0, text_length = 0;
1857 struct iscsi_cmd *cmd;
1858 struct kvec iov[3];
1859 struct iscsi_text *hdr;
1860
1861 hdr = (struct iscsi_text *) buf;
1862 payload_length = ntoh24(hdr->dlength);
1863 hdr->itt = be32_to_cpu(hdr->itt);
1864 hdr->ttt = be32_to_cpu(hdr->ttt);
1865 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1866 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1867
1868 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1869 pr_err("Unable to accept text parameter length: %u"
1870 "greater than MaxRecvDataSegmentLength %u.\n",
1871 payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
1872 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1873 buf, conn);
1874 }
1875
1876 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1877 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1878 hdr->exp_statsn, payload_length);
1879
1880 rx_size = text_length = payload_length;
1881 if (text_length) {
1882 text_in = kzalloc(text_length, GFP_KERNEL);
1883 if (!text_in) {
1884 pr_err("Unable to allocate memory for"
1885 " incoming text parameters\n");
1886 return -1;
1887 }
1888
1889 memset(iov, 0, 3 * sizeof(struct kvec));
1890 iov[niov].iov_base = text_in;
1891 iov[niov++].iov_len = text_length;
1892
1893 padding = ((-payload_length) & 3);
1894 if (padding != 0) {
1895 iov[niov].iov_base = &pad_bytes;
1896 iov[niov++].iov_len = padding;
1897 rx_size += padding;
1898 pr_debug("Receiving %u additional bytes"
1899 " for padding.\n", padding);
1900 }
1901 if (conn->conn_ops->DataDigest) {
1902 iov[niov].iov_base = &checksum;
1903 iov[niov++].iov_len = ISCSI_CRC_LEN;
1904 rx_size += ISCSI_CRC_LEN;
1905 }
1906
1907 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1908 if (rx_got != rx_size) {
1909 kfree(text_in);
1910 return -1;
1911 }
1912
1913 if (conn->conn_ops->DataDigest) {
1914 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1915 text_in, text_length,
1916 padding, (u8 *)&pad_bytes,
1917 (u8 *)&data_crc);
1918
1919 if (checksum != data_crc) {
1920 pr_err("Text data CRC32C DataDigest"
1921 " 0x%08x does not match computed"
1922 " 0x%08x\n", checksum, data_crc);
1923 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1924 pr_err("Unable to recover from"
1925 " Text Data digest failure while in"
1926 " ERL=0.\n");
1927 kfree(text_in);
1928 return -1;
1929 } else {
1930 /*
1931 * Silently drop this PDU and let the
1932 * initiator plug the CmdSN gap.
1933 */
1934 pr_debug("Dropping Text"
1935 " Command CmdSN: 0x%08x due to"
1936 " DataCRC error.\n", hdr->cmdsn);
1937 kfree(text_in);
1938 return 0;
1939 }
1940 } else {
1941 pr_debug("Got CRC32C DataDigest"
1942 " 0x%08x for %u bytes of text data.\n",
1943 checksum, text_length);
1944 }
1945 }
1946 text_in[text_length - 1] = '\0';
1947 pr_debug("Successfully read %d bytes of text"
1948 " data.\n", text_length);
1949
1950 if (strncmp("SendTargets", text_in, 11) != 0) {
1951 pr_err("Received Text Data that is not"
1952 " SendTargets, cannot continue.\n");
1953 kfree(text_in);
1954 return -1;
1955 }
1956 text_ptr = strchr(text_in, '=');
1957 if (!text_ptr) {
1958 pr_err("No \"=\" separator found in Text Data,"
1959 " cannot continue.\n");
1960 kfree(text_in);
1961 return -1;
1962 }
1963 if (strncmp("=All", text_ptr, 4) != 0) {
1964 pr_err("Unable to locate All value for"
1965 " SendTargets key, cannot continue.\n");
1966 kfree(text_in);
1967 return -1;
1968 }
1969 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1970 kfree(text_in);
1971 }
1972
1973 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1974 if (!cmd)
1975 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1976 1, buf, conn);
1977
1978 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1979 cmd->i_state = ISTATE_SEND_TEXTRSP;
1980 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1981 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1982 cmd->targ_xfer_tag = 0xFFFFFFFF;
1983 cmd->cmd_sn = hdr->cmdsn;
1984 cmd->exp_stat_sn = hdr->exp_statsn;
1985 cmd->data_direction = DMA_NONE;
1986
1987 spin_lock_bh(&conn->cmd_lock);
1988 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1989 spin_unlock_bh(&conn->cmd_lock);
1990
1991 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1992
1993 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1994 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1995 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1996 return iscsit_add_reject_from_cmd(
1997 ISCSI_REASON_PROTOCOL_ERROR,
1998 1, 0, buf, cmd);
1999
2000 return 0;
2001 }
2002
2003 return iscsit_execute_cmd(cmd, 0);
2004 }
2005
iscsit_logout_closesession(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2006 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2007 {
2008 struct iscsi_conn *conn_p;
2009 struct iscsi_session *sess = conn->sess;
2010
2011 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2012 " for SID: %u.\n", conn->cid, conn->sess->sid);
2013
2014 atomic_set(&sess->session_logout, 1);
2015 atomic_set(&conn->conn_logout_remove, 1);
2016 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2017
2018 iscsit_inc_conn_usage_count(conn);
2019 iscsit_inc_session_usage_count(sess);
2020
2021 spin_lock_bh(&sess->conn_lock);
2022 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2023 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2024 continue;
2025
2026 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2027 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2028 }
2029 spin_unlock_bh(&sess->conn_lock);
2030
2031 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2032
2033 return 0;
2034 }
2035
iscsit_logout_closeconnection(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2036 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2037 {
2038 struct iscsi_conn *l_conn;
2039 struct iscsi_session *sess = conn->sess;
2040
2041 pr_debug("Received logout request CLOSECONNECTION for CID:"
2042 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2043
2044 /*
2045 * A Logout Request with a CLOSECONNECTION reason code for a CID
2046 * can arrive on a connection with a differing CID.
2047 */
2048 if (conn->cid == cmd->logout_cid) {
2049 spin_lock_bh(&conn->state_lock);
2050 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2051 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2052
2053 atomic_set(&conn->conn_logout_remove, 1);
2054 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2055 iscsit_inc_conn_usage_count(conn);
2056
2057 spin_unlock_bh(&conn->state_lock);
2058 } else {
2059 /*
2060 * Handle all different cid CLOSECONNECTION requests in
2061 * iscsit_logout_post_handler_diffcid() as to give enough
2062 * time for any non immediate command's CmdSN to be
2063 * acknowledged on the connection in question.
2064 *
2065 * Here we simply make sure the CID is still around.
2066 */
2067 l_conn = iscsit_get_conn_from_cid(sess,
2068 cmd->logout_cid);
2069 if (!l_conn) {
2070 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2071 iscsit_add_cmd_to_response_queue(cmd, conn,
2072 cmd->i_state);
2073 return 0;
2074 }
2075
2076 iscsit_dec_conn_usage_count(l_conn);
2077 }
2078
2079 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2080
2081 return 0;
2082 }
2083
iscsit_logout_removeconnforrecovery(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2084 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2085 {
2086 struct iscsi_session *sess = conn->sess;
2087
2088 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2089 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2090
2091 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2092 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2093 " while ERL!=2.\n");
2094 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2095 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2096 return 0;
2097 }
2098
2099 if (conn->cid == cmd->logout_cid) {
2100 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2101 " with CID: %hu on CID: %hu, implementation error.\n",
2102 cmd->logout_cid, conn->cid);
2103 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2104 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2105 return 0;
2106 }
2107
2108 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2109
2110 return 0;
2111 }
2112
iscsit_handle_logout_cmd(struct iscsi_conn * conn,unsigned char * buf)2113 static int iscsit_handle_logout_cmd(
2114 struct iscsi_conn *conn,
2115 unsigned char *buf)
2116 {
2117 int cmdsn_ret, logout_remove = 0;
2118 u8 reason_code = 0;
2119 struct iscsi_cmd *cmd;
2120 struct iscsi_logout *hdr;
2121 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2122
2123 hdr = (struct iscsi_logout *) buf;
2124 reason_code = (hdr->flags & 0x7f);
2125 hdr->itt = be32_to_cpu(hdr->itt);
2126 hdr->cid = be16_to_cpu(hdr->cid);
2127 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
2128 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2129
2130 if (tiqn) {
2131 spin_lock(&tiqn->logout_stats.lock);
2132 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2133 tiqn->logout_stats.normal_logouts++;
2134 else
2135 tiqn->logout_stats.abnormal_logouts++;
2136 spin_unlock(&tiqn->logout_stats.lock);
2137 }
2138
2139 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2140 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2141 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2142 hdr->cid, conn->cid);
2143
2144 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2145 pr_err("Received logout request on connection that"
2146 " is not in logged in state, ignoring request.\n");
2147 return 0;
2148 }
2149
2150 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2151 if (!cmd)
2152 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2153 buf, conn);
2154
2155 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2156 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2157 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2158 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2159 cmd->targ_xfer_tag = 0xFFFFFFFF;
2160 cmd->cmd_sn = hdr->cmdsn;
2161 cmd->exp_stat_sn = hdr->exp_statsn;
2162 cmd->logout_cid = hdr->cid;
2163 cmd->logout_reason = reason_code;
2164 cmd->data_direction = DMA_NONE;
2165
2166 /*
2167 * We need to sleep in these cases (by returning 1) until the Logout
2168 * Response gets sent in the tx thread.
2169 */
2170 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2171 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2172 (hdr->cid == conn->cid)))
2173 logout_remove = 1;
2174
2175 spin_lock_bh(&conn->cmd_lock);
2176 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
2177 spin_unlock_bh(&conn->cmd_lock);
2178
2179 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2180 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2181
2182 /*
2183 * Immediate commands are executed, well, immediately.
2184 * Non-Immediate Logout Commands are executed in CmdSN order.
2185 */
2186 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
2187 int ret = iscsit_execute_cmd(cmd, 0);
2188
2189 if (ret < 0)
2190 return ret;
2191 } else {
2192 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2193 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2194 logout_remove = 0;
2195 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2196 return iscsit_add_reject_from_cmd(
2197 ISCSI_REASON_PROTOCOL_ERROR,
2198 1, 0, buf, cmd);
2199 }
2200 }
2201
2202 return logout_remove;
2203 }
2204
iscsit_handle_snack(struct iscsi_conn * conn,unsigned char * buf)2205 static int iscsit_handle_snack(
2206 struct iscsi_conn *conn,
2207 unsigned char *buf)
2208 {
2209 u32 unpacked_lun;
2210 u64 lun;
2211 struct iscsi_snack *hdr;
2212
2213 hdr = (struct iscsi_snack *) buf;
2214 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2215 lun = get_unaligned_le64(&hdr->lun);
2216 unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
2217 hdr->itt = be32_to_cpu(hdr->itt);
2218 hdr->ttt = be32_to_cpu(hdr->ttt);
2219 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2220 hdr->begrun = be32_to_cpu(hdr->begrun);
2221 hdr->runlength = be32_to_cpu(hdr->runlength);
2222
2223 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2224 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2225 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2226 hdr->begrun, hdr->runlength, conn->cid);
2227
2228 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2229 pr_err("Initiator sent SNACK request while in"
2230 " ErrorRecoveryLevel=0.\n");
2231 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2232 buf, conn);
2233 }
2234 /*
2235 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2236 * call from inside iscsi_send_recovery_datain_or_r2t().
2237 */
2238 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2239 case 0:
2240 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2241 hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
2242 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2243 return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
2244 hdr->begrun, hdr->runlength);
2245 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2246 return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
2247 hdr->runlength);
2248 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2249 /* FIXME: Support R-Data SNACK */
2250 pr_err("R-Data SNACK Not Supported.\n");
2251 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2252 buf, conn);
2253 default:
2254 pr_err("Unknown SNACK type 0x%02x, protocol"
2255 " error.\n", hdr->flags & 0x0f);
2256 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2257 buf, conn);
2258 }
2259
2260 return 0;
2261 }
2262
iscsit_rx_thread_wait_for_tcp(struct iscsi_conn * conn)2263 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2264 {
2265 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2266 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2267 wait_for_completion_interruptible_timeout(
2268 &conn->rx_half_close_comp,
2269 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2270 }
2271 }
2272
iscsit_handle_immediate_data(struct iscsi_cmd * cmd,unsigned char * buf,u32 length)2273 static int iscsit_handle_immediate_data(
2274 struct iscsi_cmd *cmd,
2275 unsigned char *buf,
2276 u32 length)
2277 {
2278 int iov_ret, rx_got = 0, rx_size = 0;
2279 u32 checksum, iov_count = 0, padding = 0;
2280 struct iscsi_conn *conn = cmd->conn;
2281 struct kvec *iov;
2282
2283 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2284 if (iov_ret < 0)
2285 return IMMEDIATE_DATA_CANNOT_RECOVER;
2286
2287 rx_size = length;
2288 iov_count = iov_ret;
2289 iov = &cmd->iov_data[0];
2290
2291 padding = ((-length) & 3);
2292 if (padding != 0) {
2293 iov[iov_count].iov_base = cmd->pad_bytes;
2294 iov[iov_count++].iov_len = padding;
2295 rx_size += padding;
2296 }
2297
2298 if (conn->conn_ops->DataDigest) {
2299 iov[iov_count].iov_base = &checksum;
2300 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2301 rx_size += ISCSI_CRC_LEN;
2302 }
2303
2304 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2305
2306 iscsit_unmap_iovec(cmd);
2307
2308 if (rx_got != rx_size) {
2309 iscsit_rx_thread_wait_for_tcp(conn);
2310 return IMMEDIATE_DATA_CANNOT_RECOVER;
2311 }
2312
2313 if (conn->conn_ops->DataDigest) {
2314 u32 data_crc;
2315
2316 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2317 cmd->write_data_done, length, padding,
2318 cmd->pad_bytes);
2319
2320 if (checksum != data_crc) {
2321 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2322 " does not match computed 0x%08x\n", checksum,
2323 data_crc);
2324
2325 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2326 pr_err("Unable to recover from"
2327 " Immediate Data digest failure while"
2328 " in ERL=0.\n");
2329 iscsit_add_reject_from_cmd(
2330 ISCSI_REASON_DATA_DIGEST_ERROR,
2331 1, 0, buf, cmd);
2332 return IMMEDIATE_DATA_CANNOT_RECOVER;
2333 } else {
2334 iscsit_add_reject_from_cmd(
2335 ISCSI_REASON_DATA_DIGEST_ERROR,
2336 0, 0, buf, cmd);
2337 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2338 }
2339 } else {
2340 pr_debug("Got CRC32C DataDigest 0x%08x for"
2341 " %u bytes of Immediate Data\n", checksum,
2342 length);
2343 }
2344 }
2345
2346 cmd->write_data_done += length;
2347
2348 if (cmd->write_data_done == cmd->data_length) {
2349 spin_lock_bh(&cmd->istate_lock);
2350 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2351 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2352 spin_unlock_bh(&cmd->istate_lock);
2353 }
2354
2355 return IMMEDIATE_DATA_NORMAL_OPERATION;
2356 }
2357
2358 /*
2359 * Called with sess->conn_lock held.
2360 */
2361 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2362 with active network interface */
iscsit_build_conn_drop_async_message(struct iscsi_conn * conn)2363 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2364 {
2365 struct iscsi_cmd *cmd;
2366 struct iscsi_conn *conn_p;
2367
2368 /*
2369 * Only send a Asynchronous Message on connections whos network
2370 * interface is still functional.
2371 */
2372 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2373 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2374 iscsit_inc_conn_usage_count(conn_p);
2375 break;
2376 }
2377 }
2378
2379 if (!conn_p)
2380 return;
2381
2382 cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
2383 if (!cmd) {
2384 iscsit_dec_conn_usage_count(conn_p);
2385 return;
2386 }
2387
2388 cmd->logout_cid = conn->cid;
2389 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2390 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2391
2392 spin_lock_bh(&conn_p->cmd_lock);
2393 list_add_tail(&cmd->i_list, &conn_p->conn_cmd_list);
2394 spin_unlock_bh(&conn_p->cmd_lock);
2395
2396 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2397 iscsit_dec_conn_usage_count(conn_p);
2398 }
2399
iscsit_send_conn_drop_async_message(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2400 static int iscsit_send_conn_drop_async_message(
2401 struct iscsi_cmd *cmd,
2402 struct iscsi_conn *conn)
2403 {
2404 struct iscsi_async *hdr;
2405
2406 cmd->tx_size = ISCSI_HDR_LEN;
2407 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2408
2409 hdr = (struct iscsi_async *) cmd->pdu;
2410 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2411 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2412 cmd->init_task_tag = 0xFFFFFFFF;
2413 cmd->targ_xfer_tag = 0xFFFFFFFF;
2414 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2415 cmd->stat_sn = conn->stat_sn++;
2416 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2417 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2418 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2419 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2420 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2421 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2422 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2423
2424 if (conn->conn_ops->HeaderDigest) {
2425 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2426
2427 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2428 (unsigned char *)hdr, ISCSI_HDR_LEN,
2429 0, NULL, (u8 *)header_digest);
2430
2431 cmd->tx_size += ISCSI_CRC_LEN;
2432 pr_debug("Attaching CRC32C HeaderDigest to"
2433 " Async Message 0x%08x\n", *header_digest);
2434 }
2435
2436 cmd->iov_misc[0].iov_base = cmd->pdu;
2437 cmd->iov_misc[0].iov_len = cmd->tx_size;
2438 cmd->iov_misc_count = 1;
2439
2440 pr_debug("Sending Connection Dropped Async Message StatSN:"
2441 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2442 cmd->logout_cid, conn->cid);
2443 return 0;
2444 }
2445
iscsit_send_data_in(struct iscsi_cmd * cmd,struct iscsi_conn * conn,int * eodr)2446 static int iscsit_send_data_in(
2447 struct iscsi_cmd *cmd,
2448 struct iscsi_conn *conn,
2449 int *eodr)
2450 {
2451 int iov_ret = 0, set_statsn = 0;
2452 u32 iov_count = 0, tx_size = 0;
2453 struct iscsi_datain datain;
2454 struct iscsi_datain_req *dr;
2455 struct iscsi_data_rsp *hdr;
2456 struct kvec *iov;
2457
2458 memset(&datain, 0, sizeof(struct iscsi_datain));
2459 dr = iscsit_get_datain_values(cmd, &datain);
2460 if (!dr) {
2461 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2462 cmd->init_task_tag);
2463 return -1;
2464 }
2465
2466 /*
2467 * Be paranoid and double check the logic for now.
2468 */
2469 if ((datain.offset + datain.length) > cmd->data_length) {
2470 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2471 " datain.length: %u exceeds cmd->data_length: %u\n",
2472 cmd->init_task_tag, datain.offset, datain.length,
2473 cmd->data_length);
2474 return -1;
2475 }
2476
2477 spin_lock_bh(&conn->sess->session_stats_lock);
2478 conn->sess->tx_data_octets += datain.length;
2479 if (conn->sess->se_sess->se_node_acl) {
2480 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2481 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2482 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2483 }
2484 spin_unlock_bh(&conn->sess->session_stats_lock);
2485 /*
2486 * Special case for successfully execution w/ both DATAIN
2487 * and Sense Data.
2488 */
2489 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2490 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2491 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2492 else {
2493 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2494 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2495 iscsit_increment_maxcmdsn(cmd, conn->sess);
2496 cmd->stat_sn = conn->stat_sn++;
2497 set_statsn = 1;
2498 } else if (dr->dr_complete ==
2499 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2500 set_statsn = 1;
2501 }
2502
2503 hdr = (struct iscsi_data_rsp *) cmd->pdu;
2504 memset(hdr, 0, ISCSI_HDR_LEN);
2505 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2506 hdr->flags = datain.flags;
2507 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2508 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2509 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2510 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2511 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2512 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2513 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2514 }
2515 }
2516 hton24(hdr->dlength, datain.length);
2517 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2518 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2519 (struct scsi_lun *)&hdr->lun);
2520 else
2521 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2522
2523 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2524 hdr->ttt = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
2525 cpu_to_be32(cmd->targ_xfer_tag) :
2526 0xFFFFFFFF;
2527 hdr->statsn = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
2528 0xFFFFFFFF;
2529 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2530 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2531 hdr->datasn = cpu_to_be32(datain.data_sn);
2532 hdr->offset = cpu_to_be32(datain.offset);
2533
2534 iov = &cmd->iov_data[0];
2535 iov[iov_count].iov_base = cmd->pdu;
2536 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2537 tx_size += ISCSI_HDR_LEN;
2538
2539 if (conn->conn_ops->HeaderDigest) {
2540 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2541
2542 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2543 (unsigned char *)hdr, ISCSI_HDR_LEN,
2544 0, NULL, (u8 *)header_digest);
2545
2546 iov[0].iov_len += ISCSI_CRC_LEN;
2547 tx_size += ISCSI_CRC_LEN;
2548
2549 pr_debug("Attaching CRC32 HeaderDigest"
2550 " for DataIN PDU 0x%08x\n", *header_digest);
2551 }
2552
2553 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2554 if (iov_ret < 0)
2555 return -1;
2556
2557 iov_count += iov_ret;
2558 tx_size += datain.length;
2559
2560 cmd->padding = ((-datain.length) & 3);
2561 if (cmd->padding) {
2562 iov[iov_count].iov_base = cmd->pad_bytes;
2563 iov[iov_count++].iov_len = cmd->padding;
2564 tx_size += cmd->padding;
2565
2566 pr_debug("Attaching %u padding bytes\n",
2567 cmd->padding);
2568 }
2569 if (conn->conn_ops->DataDigest) {
2570 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2571 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2572
2573 iov[iov_count].iov_base = &cmd->data_crc;
2574 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2575 tx_size += ISCSI_CRC_LEN;
2576
2577 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2578 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2579 }
2580
2581 cmd->iov_data_count = iov_count;
2582 cmd->tx_size = tx_size;
2583
2584 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2585 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2586 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2587 ntohl(hdr->offset), datain.length, conn->cid);
2588
2589 if (dr->dr_complete) {
2590 *eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2591 2 : 1;
2592 iscsit_free_datain_req(cmd, dr);
2593 }
2594
2595 return 0;
2596 }
2597
iscsit_send_logout_response(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2598 static int iscsit_send_logout_response(
2599 struct iscsi_cmd *cmd,
2600 struct iscsi_conn *conn)
2601 {
2602 int niov = 0, tx_size;
2603 struct iscsi_conn *logout_conn = NULL;
2604 struct iscsi_conn_recovery *cr = NULL;
2605 struct iscsi_session *sess = conn->sess;
2606 struct kvec *iov;
2607 struct iscsi_logout_rsp *hdr;
2608 /*
2609 * The actual shutting down of Sessions and/or Connections
2610 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2611 * is done in scsi_logout_post_handler().
2612 */
2613 switch (cmd->logout_reason) {
2614 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2615 pr_debug("iSCSI session logout successful, setting"
2616 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2617 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2618 break;
2619 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2620 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2621 break;
2622 /*
2623 * For CLOSECONNECTION logout requests carrying
2624 * a matching logout CID -> local CID, the reference
2625 * for the local CID will have been incremented in
2626 * iscsi_logout_closeconnection().
2627 *
2628 * For CLOSECONNECTION logout requests carrying
2629 * a different CID than the connection it arrived
2630 * on, the connection responding to cmd->logout_cid
2631 * is stopped in iscsit_logout_post_handler_diffcid().
2632 */
2633
2634 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2635 " successful.\n", cmd->logout_cid, conn->cid);
2636 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2637 break;
2638 case ISCSI_LOGOUT_REASON_RECOVERY:
2639 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2640 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2641 break;
2642 /*
2643 * If the connection is still active from our point of view
2644 * force connection recovery to occur.
2645 */
2646 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2647 cmd->logout_cid);
2648 if ((logout_conn)) {
2649 iscsit_connection_reinstatement_rcfr(logout_conn);
2650 iscsit_dec_conn_usage_count(logout_conn);
2651 }
2652
2653 cr = iscsit_get_inactive_connection_recovery_entry(
2654 conn->sess, cmd->logout_cid);
2655 if (!cr) {
2656 pr_err("Unable to locate CID: %hu for"
2657 " REMOVECONNFORRECOVERY Logout Request.\n",
2658 cmd->logout_cid);
2659 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2660 break;
2661 }
2662
2663 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2664
2665 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2666 " for recovery for CID: %hu on CID: %hu successful.\n",
2667 cmd->logout_cid, conn->cid);
2668 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2669 break;
2670 default:
2671 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2672 cmd->logout_reason);
2673 return -1;
2674 }
2675
2676 tx_size = ISCSI_HDR_LEN;
2677 hdr = (struct iscsi_logout_rsp *)cmd->pdu;
2678 memset(hdr, 0, ISCSI_HDR_LEN);
2679 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2680 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2681 hdr->response = cmd->logout_response;
2682 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2683 cmd->stat_sn = conn->stat_sn++;
2684 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2685
2686 iscsit_increment_maxcmdsn(cmd, conn->sess);
2687 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2688 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2689
2690 iov = &cmd->iov_misc[0];
2691 iov[niov].iov_base = cmd->pdu;
2692 iov[niov++].iov_len = ISCSI_HDR_LEN;
2693
2694 if (conn->conn_ops->HeaderDigest) {
2695 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2696
2697 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2698 (unsigned char *)hdr, ISCSI_HDR_LEN,
2699 0, NULL, (u8 *)header_digest);
2700
2701 iov[0].iov_len += ISCSI_CRC_LEN;
2702 tx_size += ISCSI_CRC_LEN;
2703 pr_debug("Attaching CRC32C HeaderDigest to"
2704 " Logout Response 0x%08x\n", *header_digest);
2705 }
2706 cmd->iov_misc_count = niov;
2707 cmd->tx_size = tx_size;
2708
2709 pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2710 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2711 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2712 cmd->logout_cid, conn->cid);
2713
2714 return 0;
2715 }
2716
2717 /*
2718 * Unsolicited NOPIN, either requesting a response or not.
2719 */
iscsit_send_unsolicited_nopin(struct iscsi_cmd * cmd,struct iscsi_conn * conn,int want_response)2720 static int iscsit_send_unsolicited_nopin(
2721 struct iscsi_cmd *cmd,
2722 struct iscsi_conn *conn,
2723 int want_response)
2724 {
2725 int tx_size = ISCSI_HDR_LEN;
2726 struct iscsi_nopin *hdr;
2727
2728 hdr = (struct iscsi_nopin *) cmd->pdu;
2729 memset(hdr, 0, ISCSI_HDR_LEN);
2730 hdr->opcode = ISCSI_OP_NOOP_IN;
2731 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2732 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2733 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2734 cmd->stat_sn = conn->stat_sn;
2735 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2736 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2737 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2738
2739 if (conn->conn_ops->HeaderDigest) {
2740 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2741
2742 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2743 (unsigned char *)hdr, ISCSI_HDR_LEN,
2744 0, NULL, (u8 *)header_digest);
2745
2746 tx_size += ISCSI_CRC_LEN;
2747 pr_debug("Attaching CRC32C HeaderDigest to"
2748 " NopIN 0x%08x\n", *header_digest);
2749 }
2750
2751 cmd->iov_misc[0].iov_base = cmd->pdu;
2752 cmd->iov_misc[0].iov_len = tx_size;
2753 cmd->iov_misc_count = 1;
2754 cmd->tx_size = tx_size;
2755
2756 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2757 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2758
2759 return 0;
2760 }
2761
iscsit_send_nopin_response(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2762 static int iscsit_send_nopin_response(
2763 struct iscsi_cmd *cmd,
2764 struct iscsi_conn *conn)
2765 {
2766 int niov = 0, tx_size;
2767 u32 padding = 0;
2768 struct kvec *iov;
2769 struct iscsi_nopin *hdr;
2770
2771 tx_size = ISCSI_HDR_LEN;
2772 hdr = (struct iscsi_nopin *) cmd->pdu;
2773 memset(hdr, 0, ISCSI_HDR_LEN);
2774 hdr->opcode = ISCSI_OP_NOOP_IN;
2775 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2776 hton24(hdr->dlength, cmd->buf_ptr_size);
2777 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2778 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2779 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2780 cmd->stat_sn = conn->stat_sn++;
2781 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2782
2783 iscsit_increment_maxcmdsn(cmd, conn->sess);
2784 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2785 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2786
2787 iov = &cmd->iov_misc[0];
2788 iov[niov].iov_base = cmd->pdu;
2789 iov[niov++].iov_len = ISCSI_HDR_LEN;
2790
2791 if (conn->conn_ops->HeaderDigest) {
2792 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2793
2794 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2795 (unsigned char *)hdr, ISCSI_HDR_LEN,
2796 0, NULL, (u8 *)header_digest);
2797
2798 iov[0].iov_len += ISCSI_CRC_LEN;
2799 tx_size += ISCSI_CRC_LEN;
2800 pr_debug("Attaching CRC32C HeaderDigest"
2801 " to NopIn 0x%08x\n", *header_digest);
2802 }
2803
2804 /*
2805 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2806 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2807 */
2808 if (cmd->buf_ptr_size) {
2809 iov[niov].iov_base = cmd->buf_ptr;
2810 iov[niov++].iov_len = cmd->buf_ptr_size;
2811 tx_size += cmd->buf_ptr_size;
2812
2813 pr_debug("Echoing back %u bytes of ping"
2814 " data.\n", cmd->buf_ptr_size);
2815
2816 padding = ((-cmd->buf_ptr_size) & 3);
2817 if (padding != 0) {
2818 iov[niov].iov_base = &cmd->pad_bytes;
2819 iov[niov++].iov_len = padding;
2820 tx_size += padding;
2821 pr_debug("Attaching %u additional"
2822 " padding bytes.\n", padding);
2823 }
2824 if (conn->conn_ops->DataDigest) {
2825 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2826 cmd->buf_ptr, cmd->buf_ptr_size,
2827 padding, (u8 *)&cmd->pad_bytes,
2828 (u8 *)&cmd->data_crc);
2829
2830 iov[niov].iov_base = &cmd->data_crc;
2831 iov[niov++].iov_len = ISCSI_CRC_LEN;
2832 tx_size += ISCSI_CRC_LEN;
2833 pr_debug("Attached DataDigest for %u"
2834 " bytes of ping data, CRC 0x%08x\n",
2835 cmd->buf_ptr_size, cmd->data_crc);
2836 }
2837 }
2838
2839 cmd->iov_misc_count = niov;
2840 cmd->tx_size = tx_size;
2841
2842 pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2843 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2844 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2845
2846 return 0;
2847 }
2848
iscsit_send_r2t(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2849 int iscsit_send_r2t(
2850 struct iscsi_cmd *cmd,
2851 struct iscsi_conn *conn)
2852 {
2853 int tx_size = 0;
2854 struct iscsi_r2t *r2t;
2855 struct iscsi_r2t_rsp *hdr;
2856
2857 r2t = iscsit_get_r2t_from_list(cmd);
2858 if (!r2t)
2859 return -1;
2860
2861 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
2862 memset(hdr, 0, ISCSI_HDR_LEN);
2863 hdr->opcode = ISCSI_OP_R2T;
2864 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2865 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2866 (struct scsi_lun *)&hdr->lun);
2867 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2868 spin_lock_bh(&conn->sess->ttt_lock);
2869 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2870 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2871 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2872 spin_unlock_bh(&conn->sess->ttt_lock);
2873 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
2874 hdr->statsn = cpu_to_be32(conn->stat_sn);
2875 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2876 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2877 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
2878 hdr->data_offset = cpu_to_be32(r2t->offset);
2879 hdr->data_length = cpu_to_be32(r2t->xfer_len);
2880
2881 cmd->iov_misc[0].iov_base = cmd->pdu;
2882 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
2883 tx_size += ISCSI_HDR_LEN;
2884
2885 if (conn->conn_ops->HeaderDigest) {
2886 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2887
2888 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2889 (unsigned char *)hdr, ISCSI_HDR_LEN,
2890 0, NULL, (u8 *)header_digest);
2891
2892 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2893 tx_size += ISCSI_CRC_LEN;
2894 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2895 " PDU 0x%08x\n", *header_digest);
2896 }
2897
2898 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2899 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2900 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2901 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2902 r2t->offset, r2t->xfer_len, conn->cid);
2903
2904 cmd->iov_misc_count = 1;
2905 cmd->tx_size = tx_size;
2906
2907 spin_lock_bh(&cmd->r2t_lock);
2908 r2t->sent_r2t = 1;
2909 spin_unlock_bh(&cmd->r2t_lock);
2910
2911 return 0;
2912 }
2913
2914 /*
2915 * type 0: Normal Operation.
2916 * type 1: Called from Storage Transport.
2917 * type 2: Called from iscsi_task_reassign_complete_write() for
2918 * connection recovery.
2919 */
iscsit_build_r2ts_for_cmd(struct iscsi_cmd * cmd,struct iscsi_conn * conn,int type)2920 int iscsit_build_r2ts_for_cmd(
2921 struct iscsi_cmd *cmd,
2922 struct iscsi_conn *conn,
2923 int type)
2924 {
2925 int first_r2t = 1;
2926 u32 offset = 0, xfer_len = 0;
2927
2928 spin_lock_bh(&cmd->r2t_lock);
2929 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2930 spin_unlock_bh(&cmd->r2t_lock);
2931 return 0;
2932 }
2933
2934 if (conn->sess->sess_ops->DataSequenceInOrder && (type != 2))
2935 if (cmd->r2t_offset < cmd->write_data_done)
2936 cmd->r2t_offset = cmd->write_data_done;
2937
2938 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2939 if (conn->sess->sess_ops->DataSequenceInOrder) {
2940 offset = cmd->r2t_offset;
2941
2942 if (first_r2t && (type == 2)) {
2943 xfer_len = ((offset +
2944 (conn->sess->sess_ops->MaxBurstLength -
2945 cmd->next_burst_len) >
2946 cmd->data_length) ?
2947 (cmd->data_length - offset) :
2948 (conn->sess->sess_ops->MaxBurstLength -
2949 cmd->next_burst_len));
2950 } else {
2951 xfer_len = ((offset +
2952 conn->sess->sess_ops->MaxBurstLength) >
2953 cmd->data_length) ?
2954 (cmd->data_length - offset) :
2955 conn->sess->sess_ops->MaxBurstLength;
2956 }
2957 cmd->r2t_offset += xfer_len;
2958
2959 if (cmd->r2t_offset == cmd->data_length)
2960 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2961 } else {
2962 struct iscsi_seq *seq;
2963
2964 seq = iscsit_get_seq_holder_for_r2t(cmd);
2965 if (!seq) {
2966 spin_unlock_bh(&cmd->r2t_lock);
2967 return -1;
2968 }
2969
2970 offset = seq->offset;
2971 xfer_len = seq->xfer_len;
2972
2973 if (cmd->seq_send_order == cmd->seq_count)
2974 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2975 }
2976 cmd->outstanding_r2ts++;
2977 first_r2t = 0;
2978
2979 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
2980 spin_unlock_bh(&cmd->r2t_lock);
2981 return -1;
2982 }
2983
2984 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
2985 break;
2986 }
2987 spin_unlock_bh(&cmd->r2t_lock);
2988
2989 return 0;
2990 }
2991
iscsit_send_status(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2992 static int iscsit_send_status(
2993 struct iscsi_cmd *cmd,
2994 struct iscsi_conn *conn)
2995 {
2996 u8 iov_count = 0, recovery;
2997 u32 padding = 0, tx_size = 0;
2998 struct iscsi_scsi_rsp *hdr;
2999 struct kvec *iov;
3000
3001 recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3002 if (!recovery)
3003 cmd->stat_sn = conn->stat_sn++;
3004
3005 spin_lock_bh(&conn->sess->session_stats_lock);
3006 conn->sess->rsp_pdus++;
3007 spin_unlock_bh(&conn->sess->session_stats_lock);
3008
3009 hdr = (struct iscsi_scsi_rsp *) cmd->pdu;
3010 memset(hdr, 0, ISCSI_HDR_LEN);
3011 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3012 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3013 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3014 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3015 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3016 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3017 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3018 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3019 }
3020 hdr->response = cmd->iscsi_response;
3021 hdr->cmd_status = cmd->se_cmd.scsi_status;
3022 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3023 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3024
3025 iscsit_increment_maxcmdsn(cmd, conn->sess);
3026 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3027 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3028
3029 iov = &cmd->iov_misc[0];
3030 iov[iov_count].iov_base = cmd->pdu;
3031 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3032 tx_size += ISCSI_HDR_LEN;
3033
3034 /*
3035 * Attach SENSE DATA payload to iSCSI Response PDU
3036 */
3037 if (cmd->se_cmd.sense_buffer &&
3038 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3039 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3040 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3041 hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
3042 iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
3043 iov[iov_count++].iov_len =
3044 (cmd->se_cmd.scsi_sense_length + padding);
3045 tx_size += cmd->se_cmd.scsi_sense_length;
3046
3047 if (padding) {
3048 memset(cmd->se_cmd.sense_buffer +
3049 cmd->se_cmd.scsi_sense_length, 0, padding);
3050 tx_size += padding;
3051 pr_debug("Adding %u bytes of padding to"
3052 " SENSE.\n", padding);
3053 }
3054
3055 if (conn->conn_ops->DataDigest) {
3056 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3057 cmd->se_cmd.sense_buffer,
3058 (cmd->se_cmd.scsi_sense_length + padding),
3059 0, NULL, (u8 *)&cmd->data_crc);
3060
3061 iov[iov_count].iov_base = &cmd->data_crc;
3062 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3063 tx_size += ISCSI_CRC_LEN;
3064
3065 pr_debug("Attaching CRC32 DataDigest for"
3066 " SENSE, %u bytes CRC 0x%08x\n",
3067 (cmd->se_cmd.scsi_sense_length + padding),
3068 cmd->data_crc);
3069 }
3070
3071 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3072 " Response PDU\n",
3073 cmd->se_cmd.scsi_sense_length);
3074 }
3075
3076 if (conn->conn_ops->HeaderDigest) {
3077 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3078
3079 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3080 (unsigned char *)hdr, ISCSI_HDR_LEN,
3081 0, NULL, (u8 *)header_digest);
3082
3083 iov[0].iov_len += ISCSI_CRC_LEN;
3084 tx_size += ISCSI_CRC_LEN;
3085 pr_debug("Attaching CRC32 HeaderDigest for Response"
3086 " PDU 0x%08x\n", *header_digest);
3087 }
3088
3089 cmd->iov_misc_count = iov_count;
3090 cmd->tx_size = tx_size;
3091
3092 pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3093 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3094 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3095 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3096
3097 return 0;
3098 }
3099
iscsit_convert_tcm_tmr_rsp(struct se_tmr_req * se_tmr)3100 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3101 {
3102 switch (se_tmr->response) {
3103 case TMR_FUNCTION_COMPLETE:
3104 return ISCSI_TMF_RSP_COMPLETE;
3105 case TMR_TASK_DOES_NOT_EXIST:
3106 return ISCSI_TMF_RSP_NO_TASK;
3107 case TMR_LUN_DOES_NOT_EXIST:
3108 return ISCSI_TMF_RSP_NO_LUN;
3109 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3110 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3111 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3112 return ISCSI_TMF_RSP_AUTH_FAILED;
3113 case TMR_FUNCTION_REJECTED:
3114 default:
3115 return ISCSI_TMF_RSP_REJECTED;
3116 }
3117 }
3118
iscsit_send_task_mgt_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3119 static int iscsit_send_task_mgt_rsp(
3120 struct iscsi_cmd *cmd,
3121 struct iscsi_conn *conn)
3122 {
3123 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3124 struct iscsi_tm_rsp *hdr;
3125 u32 tx_size = 0;
3126
3127 hdr = (struct iscsi_tm_rsp *) cmd->pdu;
3128 memset(hdr, 0, ISCSI_HDR_LEN);
3129 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3130 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3131 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3132 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3133 cmd->stat_sn = conn->stat_sn++;
3134 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3135
3136 iscsit_increment_maxcmdsn(cmd, conn->sess);
3137 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3138 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3139
3140 cmd->iov_misc[0].iov_base = cmd->pdu;
3141 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3142 tx_size += ISCSI_HDR_LEN;
3143
3144 if (conn->conn_ops->HeaderDigest) {
3145 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3146
3147 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3148 (unsigned char *)hdr, ISCSI_HDR_LEN,
3149 0, NULL, (u8 *)header_digest);
3150
3151 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3152 tx_size += ISCSI_CRC_LEN;
3153 pr_debug("Attaching CRC32 HeaderDigest for Task"
3154 " Mgmt Response PDU 0x%08x\n", *header_digest);
3155 }
3156
3157 cmd->iov_misc_count = 1;
3158 cmd->tx_size = tx_size;
3159
3160 pr_debug("Built Task Management Response ITT: 0x%08x,"
3161 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3162 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3163
3164 return 0;
3165 }
3166
iscsit_check_inaddr_any(struct iscsi_np * np)3167 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3168 {
3169 bool ret = false;
3170
3171 if (np->np_sockaddr.ss_family == AF_INET6) {
3172 const struct sockaddr_in6 sin6 = {
3173 .sin6_addr = IN6ADDR_ANY_INIT };
3174 struct sockaddr_in6 *sock_in6 =
3175 (struct sockaddr_in6 *)&np->np_sockaddr;
3176
3177 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3178 sin6.sin6_addr.s6_addr, 16))
3179 ret = true;
3180 } else {
3181 struct sockaddr_in * sock_in =
3182 (struct sockaddr_in *)&np->np_sockaddr;
3183
3184 if (sock_in->sin_addr.s_addr == INADDR_ANY)
3185 ret = true;
3186 }
3187
3188 return ret;
3189 }
3190
iscsit_build_sendtargets_response(struct iscsi_cmd * cmd)3191 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3192 {
3193 char *payload = NULL;
3194 struct iscsi_conn *conn = cmd->conn;
3195 struct iscsi_portal_group *tpg;
3196 struct iscsi_tiqn *tiqn;
3197 struct iscsi_tpg_np *tpg_np;
3198 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3199 unsigned char buf[256];
3200
3201 buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ?
3202 32768 : conn->conn_ops->MaxRecvDataSegmentLength;
3203
3204 memset(buf, 0, 256);
3205
3206 payload = kzalloc(buffer_len, GFP_KERNEL);
3207 if (!payload) {
3208 pr_err("Unable to allocate memory for sendtargets"
3209 " response.\n");
3210 return -ENOMEM;
3211 }
3212
3213 spin_lock(&tiqn_lock);
3214 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3215 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3216 len += 1;
3217
3218 if ((len + payload_len) > buffer_len) {
3219 spin_unlock(&tiqn->tiqn_tpg_lock);
3220 end_of_buf = 1;
3221 goto eob;
3222 }
3223 memcpy(payload + payload_len, buf, len);
3224 payload_len += len;
3225
3226 spin_lock(&tiqn->tiqn_tpg_lock);
3227 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3228
3229 spin_lock(&tpg->tpg_state_lock);
3230 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3231 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3232 spin_unlock(&tpg->tpg_state_lock);
3233 continue;
3234 }
3235 spin_unlock(&tpg->tpg_state_lock);
3236
3237 spin_lock(&tpg->tpg_np_lock);
3238 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3239 tpg_np_list) {
3240 struct iscsi_np *np = tpg_np->tpg_np;
3241 bool inaddr_any = iscsit_check_inaddr_any(np);
3242
3243 len = sprintf(buf, "TargetAddress="
3244 "%s%s%s:%hu,%hu",
3245 (np->np_sockaddr.ss_family == AF_INET6) ?
3246 "[" : "", (inaddr_any == false) ?
3247 np->np_ip : conn->local_ip,
3248 (np->np_sockaddr.ss_family == AF_INET6) ?
3249 "]" : "", (inaddr_any == false) ?
3250 np->np_port : conn->local_port,
3251 tpg->tpgt);
3252 len += 1;
3253
3254 if ((len + payload_len) > buffer_len) {
3255 spin_unlock(&tpg->tpg_np_lock);
3256 spin_unlock(&tiqn->tiqn_tpg_lock);
3257 end_of_buf = 1;
3258 goto eob;
3259 }
3260 memcpy(payload + payload_len, buf, len);
3261 payload_len += len;
3262 }
3263 spin_unlock(&tpg->tpg_np_lock);
3264 }
3265 spin_unlock(&tiqn->tiqn_tpg_lock);
3266 eob:
3267 if (end_of_buf)
3268 break;
3269 }
3270 spin_unlock(&tiqn_lock);
3271
3272 cmd->buf_ptr = payload;
3273
3274 return payload_len;
3275 }
3276
3277 /*
3278 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3279 * MaxRecvDataSegmentLength.
3280 */
iscsit_send_text_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3281 static int iscsit_send_text_rsp(
3282 struct iscsi_cmd *cmd,
3283 struct iscsi_conn *conn)
3284 {
3285 struct iscsi_text_rsp *hdr;
3286 struct kvec *iov;
3287 u32 padding = 0, tx_size = 0;
3288 int text_length, iov_count = 0;
3289
3290 text_length = iscsit_build_sendtargets_response(cmd);
3291 if (text_length < 0)
3292 return text_length;
3293
3294 padding = ((-text_length) & 3);
3295 if (padding != 0) {
3296 memset(cmd->buf_ptr + text_length, 0, padding);
3297 pr_debug("Attaching %u additional bytes for"
3298 " padding.\n", padding);
3299 }
3300
3301 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3302 memset(hdr, 0, ISCSI_HDR_LEN);
3303 hdr->opcode = ISCSI_OP_TEXT_RSP;
3304 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3305 hton24(hdr->dlength, text_length);
3306 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3307 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3308 cmd->stat_sn = conn->stat_sn++;
3309 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3310
3311 iscsit_increment_maxcmdsn(cmd, conn->sess);
3312 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3313 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3314
3315 iov = &cmd->iov_misc[0];
3316
3317 iov[iov_count].iov_base = cmd->pdu;
3318 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3319 iov[iov_count].iov_base = cmd->buf_ptr;
3320 iov[iov_count++].iov_len = text_length + padding;
3321
3322 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3323
3324 if (conn->conn_ops->HeaderDigest) {
3325 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3326
3327 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3328 (unsigned char *)hdr, ISCSI_HDR_LEN,
3329 0, NULL, (u8 *)header_digest);
3330
3331 iov[0].iov_len += ISCSI_CRC_LEN;
3332 tx_size += ISCSI_CRC_LEN;
3333 pr_debug("Attaching CRC32 HeaderDigest for"
3334 " Text Response PDU 0x%08x\n", *header_digest);
3335 }
3336
3337 if (conn->conn_ops->DataDigest) {
3338 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3339 cmd->buf_ptr, (text_length + padding),
3340 0, NULL, (u8 *)&cmd->data_crc);
3341
3342 iov[iov_count].iov_base = &cmd->data_crc;
3343 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3344 tx_size += ISCSI_CRC_LEN;
3345
3346 pr_debug("Attaching DataDigest for %u bytes of text"
3347 " data, CRC 0x%08x\n", (text_length + padding),
3348 cmd->data_crc);
3349 }
3350
3351 cmd->iov_misc_count = iov_count;
3352 cmd->tx_size = tx_size;
3353
3354 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3355 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3356 text_length, conn->cid);
3357 return 0;
3358 }
3359
iscsit_send_reject(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3360 static int iscsit_send_reject(
3361 struct iscsi_cmd *cmd,
3362 struct iscsi_conn *conn)
3363 {
3364 u32 iov_count = 0, tx_size = 0;
3365 struct iscsi_reject *hdr;
3366 struct kvec *iov;
3367
3368 hdr = (struct iscsi_reject *) cmd->pdu;
3369 hdr->opcode = ISCSI_OP_REJECT;
3370 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3371 hton24(hdr->dlength, ISCSI_HDR_LEN);
3372 cmd->stat_sn = conn->stat_sn++;
3373 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3374 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3375 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3376
3377 iov = &cmd->iov_misc[0];
3378
3379 iov[iov_count].iov_base = cmd->pdu;
3380 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3381 iov[iov_count].iov_base = cmd->buf_ptr;
3382 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3383
3384 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3385
3386 if (conn->conn_ops->HeaderDigest) {
3387 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3388
3389 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3390 (unsigned char *)hdr, ISCSI_HDR_LEN,
3391 0, NULL, (u8 *)header_digest);
3392
3393 iov[0].iov_len += ISCSI_CRC_LEN;
3394 tx_size += ISCSI_CRC_LEN;
3395 pr_debug("Attaching CRC32 HeaderDigest for"
3396 " REJECT PDU 0x%08x\n", *header_digest);
3397 }
3398
3399 if (conn->conn_ops->DataDigest) {
3400 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3401 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3402 0, NULL, (u8 *)&cmd->data_crc);
3403
3404 iov[iov_count].iov_base = &cmd->data_crc;
3405 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3406 tx_size += ISCSI_CRC_LEN;
3407 pr_debug("Attaching CRC32 DataDigest for REJECT"
3408 " PDU 0x%08x\n", cmd->data_crc);
3409 }
3410
3411 cmd->iov_misc_count = iov_count;
3412 cmd->tx_size = tx_size;
3413
3414 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3415 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3416
3417 return 0;
3418 }
3419
iscsit_tx_thread_wait_for_tcp(struct iscsi_conn * conn)3420 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
3421 {
3422 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
3423 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
3424 wait_for_completion_interruptible_timeout(
3425 &conn->tx_half_close_comp,
3426 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
3427 }
3428 }
3429
3430 #ifdef CONFIG_SMP
3431
iscsit_thread_get_cpumask(struct iscsi_conn * conn)3432 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3433 {
3434 struct iscsi_thread_set *ts = conn->thread_set;
3435 int ord, cpu;
3436 /*
3437 * thread_id is assigned from iscsit_global->ts_bitmap from
3438 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3439 *
3440 * Here we use thread_id to determine which CPU that this
3441 * iSCSI connection's iscsi_thread_set will be scheduled to
3442 * execute upon.
3443 */
3444 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3445 #if 0
3446 pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from"
3447 " thread_id: %d\n", ord, ts->thread_id);
3448 #endif
3449 for_each_online_cpu(cpu) {
3450 if (ord-- == 0) {
3451 cpumask_set_cpu(cpu, conn->conn_cpumask);
3452 return;
3453 }
3454 }
3455 /*
3456 * This should never be reached..
3457 */
3458 dump_stack();
3459 cpumask_setall(conn->conn_cpumask);
3460 }
3461
iscsit_thread_check_cpumask(struct iscsi_conn * conn,struct task_struct * p,int mode)3462 static inline void iscsit_thread_check_cpumask(
3463 struct iscsi_conn *conn,
3464 struct task_struct *p,
3465 int mode)
3466 {
3467 char buf[128];
3468 /*
3469 * mode == 1 signals iscsi_target_tx_thread() usage.
3470 * mode == 0 signals iscsi_target_rx_thread() usage.
3471 */
3472 if (mode == 1) {
3473 if (!conn->conn_tx_reset_cpumask)
3474 return;
3475 conn->conn_tx_reset_cpumask = 0;
3476 } else {
3477 if (!conn->conn_rx_reset_cpumask)
3478 return;
3479 conn->conn_rx_reset_cpumask = 0;
3480 }
3481 /*
3482 * Update the CPU mask for this single kthread so that
3483 * both TX and RX kthreads are scheduled to run on the
3484 * same CPU.
3485 */
3486 memset(buf, 0, 128);
3487 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3488 #if 0
3489 pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():"
3490 " %s for %s\n", buf, p->comm);
3491 #endif
3492 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3493 }
3494
3495 #else
3496
iscsit_thread_get_cpumask(struct iscsi_conn * conn)3497 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3498 {
3499 return;
3500 }
3501
3502 #define iscsit_thread_check_cpumask(X, Y, Z) ({})
3503 #endif /* CONFIG_SMP */
3504
iscsi_target_tx_thread(void * arg)3505 int iscsi_target_tx_thread(void *arg)
3506 {
3507 u8 state;
3508 int eodr = 0;
3509 int ret = 0;
3510 int sent_status = 0;
3511 int use_misc = 0;
3512 int map_sg = 0;
3513 struct iscsi_cmd *cmd = NULL;
3514 struct iscsi_conn *conn;
3515 struct iscsi_queue_req *qr = NULL;
3516 struct se_cmd *se_cmd;
3517 struct iscsi_thread_set *ts = arg;
3518 /*
3519 * Allow ourselves to be interrupted by SIGINT so that a
3520 * connection recovery / failure event can be triggered externally.
3521 */
3522 allow_signal(SIGINT);
3523
3524 restart:
3525 conn = iscsi_tx_thread_pre_handler(ts);
3526 if (!conn)
3527 goto out;
3528
3529 eodr = map_sg = ret = sent_status = use_misc = 0;
3530
3531 while (!kthread_should_stop()) {
3532 /*
3533 * Ensure that both TX and RX per connection kthreads
3534 * are scheduled to run on the same CPU.
3535 */
3536 iscsit_thread_check_cpumask(conn, current, 1);
3537
3538 schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
3539
3540 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3541 signal_pending(current))
3542 goto transport_err;
3543
3544 get_immediate:
3545 qr = iscsit_get_cmd_from_immediate_queue(conn);
3546 if (qr) {
3547 atomic_set(&conn->check_immediate_queue, 0);
3548 cmd = qr->cmd;
3549 state = qr->state;
3550 kmem_cache_free(lio_qr_cache, qr);
3551
3552 spin_lock_bh(&cmd->istate_lock);
3553 switch (state) {
3554 case ISTATE_SEND_R2T:
3555 spin_unlock_bh(&cmd->istate_lock);
3556 ret = iscsit_send_r2t(cmd, conn);
3557 break;
3558 case ISTATE_REMOVE:
3559 spin_unlock_bh(&cmd->istate_lock);
3560
3561 if (cmd->data_direction == DMA_TO_DEVICE)
3562 iscsit_stop_dataout_timer(cmd);
3563
3564 spin_lock_bh(&conn->cmd_lock);
3565 list_del(&cmd->i_list);
3566 spin_unlock_bh(&conn->cmd_lock);
3567
3568 iscsit_free_cmd(cmd);
3569 goto get_immediate;
3570 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3571 spin_unlock_bh(&cmd->istate_lock);
3572 iscsit_mod_nopin_response_timer(conn);
3573 ret = iscsit_send_unsolicited_nopin(cmd,
3574 conn, 1);
3575 break;
3576 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3577 spin_unlock_bh(&cmd->istate_lock);
3578 ret = iscsit_send_unsolicited_nopin(cmd,
3579 conn, 0);
3580 break;
3581 default:
3582 pr_err("Unknown Opcode: 0x%02x ITT:"
3583 " 0x%08x, i_state: %d on CID: %hu\n",
3584 cmd->iscsi_opcode, cmd->init_task_tag, state,
3585 conn->cid);
3586 spin_unlock_bh(&cmd->istate_lock);
3587 goto transport_err;
3588 }
3589 if (ret < 0) {
3590 conn->tx_immediate_queue = 0;
3591 goto transport_err;
3592 }
3593
3594 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3595 conn->tx_immediate_queue = 0;
3596 iscsit_tx_thread_wait_for_tcp(conn);
3597 goto transport_err;
3598 }
3599
3600 spin_lock_bh(&cmd->istate_lock);
3601 switch (state) {
3602 case ISTATE_SEND_R2T:
3603 spin_unlock_bh(&cmd->istate_lock);
3604 spin_lock_bh(&cmd->dataout_timeout_lock);
3605 iscsit_start_dataout_timer(cmd, conn);
3606 spin_unlock_bh(&cmd->dataout_timeout_lock);
3607 break;
3608 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3609 cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE;
3610 spin_unlock_bh(&cmd->istate_lock);
3611 break;
3612 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3613 cmd->i_state = ISTATE_SENT_STATUS;
3614 spin_unlock_bh(&cmd->istate_lock);
3615 break;
3616 default:
3617 pr_err("Unknown Opcode: 0x%02x ITT:"
3618 " 0x%08x, i_state: %d on CID: %hu\n",
3619 cmd->iscsi_opcode, cmd->init_task_tag,
3620 state, conn->cid);
3621 spin_unlock_bh(&cmd->istate_lock);
3622 goto transport_err;
3623 }
3624 goto get_immediate;
3625 } else
3626 conn->tx_immediate_queue = 0;
3627
3628 get_response:
3629 qr = iscsit_get_cmd_from_response_queue(conn);
3630 if (qr) {
3631 cmd = qr->cmd;
3632 state = qr->state;
3633 kmem_cache_free(lio_qr_cache, qr);
3634
3635 spin_lock_bh(&cmd->istate_lock);
3636 check_rsp_state:
3637 switch (state) {
3638 case ISTATE_SEND_DATAIN:
3639 spin_unlock_bh(&cmd->istate_lock);
3640 ret = iscsit_send_data_in(cmd, conn,
3641 &eodr);
3642 map_sg = 1;
3643 break;
3644 case ISTATE_SEND_STATUS:
3645 case ISTATE_SEND_STATUS_RECOVERY:
3646 spin_unlock_bh(&cmd->istate_lock);
3647 use_misc = 1;
3648 ret = iscsit_send_status(cmd, conn);
3649 break;
3650 case ISTATE_SEND_LOGOUTRSP:
3651 spin_unlock_bh(&cmd->istate_lock);
3652 use_misc = 1;
3653 ret = iscsit_send_logout_response(cmd, conn);
3654 break;
3655 case ISTATE_SEND_ASYNCMSG:
3656 spin_unlock_bh(&cmd->istate_lock);
3657 use_misc = 1;
3658 ret = iscsit_send_conn_drop_async_message(
3659 cmd, conn);
3660 break;
3661 case ISTATE_SEND_NOPIN:
3662 spin_unlock_bh(&cmd->istate_lock);
3663 use_misc = 1;
3664 ret = iscsit_send_nopin_response(cmd, conn);
3665 break;
3666 case ISTATE_SEND_REJECT:
3667 spin_unlock_bh(&cmd->istate_lock);
3668 use_misc = 1;
3669 ret = iscsit_send_reject(cmd, conn);
3670 break;
3671 case ISTATE_SEND_TASKMGTRSP:
3672 spin_unlock_bh(&cmd->istate_lock);
3673 use_misc = 1;
3674 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3675 if (ret != 0)
3676 break;
3677 ret = iscsit_tmr_post_handler(cmd, conn);
3678 if (ret != 0)
3679 iscsit_fall_back_to_erl0(conn->sess);
3680 break;
3681 case ISTATE_SEND_TEXTRSP:
3682 spin_unlock_bh(&cmd->istate_lock);
3683 use_misc = 1;
3684 ret = iscsit_send_text_rsp(cmd, conn);
3685 break;
3686 default:
3687 pr_err("Unknown Opcode: 0x%02x ITT:"
3688 " 0x%08x, i_state: %d on CID: %hu\n",
3689 cmd->iscsi_opcode, cmd->init_task_tag,
3690 state, conn->cid);
3691 spin_unlock_bh(&cmd->istate_lock);
3692 goto transport_err;
3693 }
3694 if (ret < 0) {
3695 conn->tx_response_queue = 0;
3696 goto transport_err;
3697 }
3698
3699 se_cmd = &cmd->se_cmd;
3700
3701 if (map_sg && !conn->conn_ops->IFMarker) {
3702 if (iscsit_fe_sendpage_sg(cmd, conn) < 0) {
3703 conn->tx_response_queue = 0;
3704 iscsit_tx_thread_wait_for_tcp(conn);
3705 iscsit_unmap_iovec(cmd);
3706 goto transport_err;
3707 }
3708 } else {
3709 if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) {
3710 conn->tx_response_queue = 0;
3711 iscsit_tx_thread_wait_for_tcp(conn);
3712 iscsit_unmap_iovec(cmd);
3713 goto transport_err;
3714 }
3715 }
3716 map_sg = 0;
3717 iscsit_unmap_iovec(cmd);
3718
3719 spin_lock_bh(&cmd->istate_lock);
3720 switch (state) {
3721 case ISTATE_SEND_DATAIN:
3722 if (!eodr)
3723 goto check_rsp_state;
3724
3725 if (eodr == 1) {
3726 cmd->i_state = ISTATE_SENT_LAST_DATAIN;
3727 sent_status = 1;
3728 eodr = use_misc = 0;
3729 } else if (eodr == 2) {
3730 cmd->i_state = state =
3731 ISTATE_SEND_STATUS;
3732 sent_status = 0;
3733 eodr = use_misc = 0;
3734 goto check_rsp_state;
3735 }
3736 break;
3737 case ISTATE_SEND_STATUS:
3738 use_misc = 0;
3739 sent_status = 1;
3740 break;
3741 case ISTATE_SEND_ASYNCMSG:
3742 case ISTATE_SEND_NOPIN:
3743 case ISTATE_SEND_STATUS_RECOVERY:
3744 case ISTATE_SEND_TEXTRSP:
3745 use_misc = 0;
3746 sent_status = 1;
3747 break;
3748 case ISTATE_SEND_REJECT:
3749 use_misc = 0;
3750 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3751 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3752 spin_unlock_bh(&cmd->istate_lock);
3753 complete(&cmd->reject_comp);
3754 goto transport_err;
3755 }
3756 complete(&cmd->reject_comp);
3757 break;
3758 case ISTATE_SEND_TASKMGTRSP:
3759 use_misc = 0;
3760 sent_status = 1;
3761 break;
3762 case ISTATE_SEND_LOGOUTRSP:
3763 spin_unlock_bh(&cmd->istate_lock);
3764 if (!iscsit_logout_post_handler(cmd, conn))
3765 goto restart;
3766 spin_lock_bh(&cmd->istate_lock);
3767 use_misc = 0;
3768 sent_status = 1;
3769 break;
3770 default:
3771 pr_err("Unknown Opcode: 0x%02x ITT:"
3772 " 0x%08x, i_state: %d on CID: %hu\n",
3773 cmd->iscsi_opcode, cmd->init_task_tag,
3774 cmd->i_state, conn->cid);
3775 spin_unlock_bh(&cmd->istate_lock);
3776 goto transport_err;
3777 }
3778
3779 if (sent_status) {
3780 cmd->i_state = ISTATE_SENT_STATUS;
3781 sent_status = 0;
3782 }
3783 spin_unlock_bh(&cmd->istate_lock);
3784
3785 if (atomic_read(&conn->check_immediate_queue))
3786 goto get_immediate;
3787
3788 goto get_response;
3789 } else
3790 conn->tx_response_queue = 0;
3791 }
3792
3793 transport_err:
3794 iscsit_take_action_for_connection_exit(conn);
3795 goto restart;
3796 out:
3797 return 0;
3798 }
3799
iscsi_target_rx_thread(void * arg)3800 int iscsi_target_rx_thread(void *arg)
3801 {
3802 int ret;
3803 u8 buffer[ISCSI_HDR_LEN], opcode;
3804 u32 checksum = 0, digest = 0;
3805 struct iscsi_conn *conn = NULL;
3806 struct iscsi_thread_set *ts = arg;
3807 struct kvec iov;
3808 /*
3809 * Allow ourselves to be interrupted by SIGINT so that a
3810 * connection recovery / failure event can be triggered externally.
3811 */
3812 allow_signal(SIGINT);
3813
3814 restart:
3815 conn = iscsi_rx_thread_pre_handler(ts);
3816 if (!conn)
3817 goto out;
3818
3819 while (!kthread_should_stop()) {
3820 /*
3821 * Ensure that both TX and RX per connection kthreads
3822 * are scheduled to run on the same CPU.
3823 */
3824 iscsit_thread_check_cpumask(conn, current, 0);
3825
3826 memset(buffer, 0, ISCSI_HDR_LEN);
3827 memset(&iov, 0, sizeof(struct kvec));
3828
3829 iov.iov_base = buffer;
3830 iov.iov_len = ISCSI_HDR_LEN;
3831
3832 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3833 if (ret != ISCSI_HDR_LEN) {
3834 iscsit_rx_thread_wait_for_tcp(conn);
3835 goto transport_err;
3836 }
3837
3838 /*
3839 * Set conn->bad_hdr for use with REJECT PDUs.
3840 */
3841 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3842
3843 if (conn->conn_ops->HeaderDigest) {
3844 iov.iov_base = &digest;
3845 iov.iov_len = ISCSI_CRC_LEN;
3846
3847 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3848 if (ret != ISCSI_CRC_LEN) {
3849 iscsit_rx_thread_wait_for_tcp(conn);
3850 goto transport_err;
3851 }
3852
3853 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3854 buffer, ISCSI_HDR_LEN,
3855 0, NULL, (u8 *)&checksum);
3856
3857 if (digest != checksum) {
3858 pr_err("HeaderDigest CRC32C failed,"
3859 " received 0x%08x, computed 0x%08x\n",
3860 digest, checksum);
3861 /*
3862 * Set the PDU to 0xff so it will intentionally
3863 * hit default in the switch below.
3864 */
3865 memset(buffer, 0xff, ISCSI_HDR_LEN);
3866 spin_lock_bh(&conn->sess->session_stats_lock);
3867 conn->sess->conn_digest_errors++;
3868 spin_unlock_bh(&conn->sess->session_stats_lock);
3869 } else {
3870 pr_debug("Got HeaderDigest CRC32C"
3871 " 0x%08x\n", checksum);
3872 }
3873 }
3874
3875 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3876 goto transport_err;
3877
3878 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3879
3880 if (conn->sess->sess_ops->SessionType &&
3881 ((!(opcode & ISCSI_OP_TEXT)) ||
3882 (!(opcode & ISCSI_OP_LOGOUT)))) {
3883 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3884 " while in Discovery Session, rejecting.\n", opcode);
3885 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3886 buffer, conn);
3887 goto transport_err;
3888 }
3889
3890 switch (opcode) {
3891 case ISCSI_OP_SCSI_CMD:
3892 if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3893 goto transport_err;
3894 break;
3895 case ISCSI_OP_SCSI_DATA_OUT:
3896 if (iscsit_handle_data_out(conn, buffer) < 0)
3897 goto transport_err;
3898 break;
3899 case ISCSI_OP_NOOP_OUT:
3900 if (iscsit_handle_nop_out(conn, buffer) < 0)
3901 goto transport_err;
3902 break;
3903 case ISCSI_OP_SCSI_TMFUNC:
3904 if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3905 goto transport_err;
3906 break;
3907 case ISCSI_OP_TEXT:
3908 if (iscsit_handle_text_cmd(conn, buffer) < 0)
3909 goto transport_err;
3910 break;
3911 case ISCSI_OP_LOGOUT:
3912 ret = iscsit_handle_logout_cmd(conn, buffer);
3913 if (ret > 0) {
3914 wait_for_completion_timeout(&conn->conn_logout_comp,
3915 SECONDS_FOR_LOGOUT_COMP * HZ);
3916 goto transport_err;
3917 } else if (ret < 0)
3918 goto transport_err;
3919 break;
3920 case ISCSI_OP_SNACK:
3921 if (iscsit_handle_snack(conn, buffer) < 0)
3922 goto transport_err;
3923 break;
3924 default:
3925 pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3926 opcode);
3927 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3928 pr_err("Cannot recover from unknown"
3929 " opcode while ERL=0, closing iSCSI connection"
3930 ".\n");
3931 goto transport_err;
3932 }
3933 if (!conn->conn_ops->OFMarker) {
3934 pr_err("Unable to recover from unknown"
3935 " opcode while OFMarker=No, closing iSCSI"
3936 " connection.\n");
3937 goto transport_err;
3938 }
3939 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3940 pr_err("Unable to recover from unknown"
3941 " opcode, closing iSCSI connection.\n");
3942 goto transport_err;
3943 }
3944 break;
3945 }
3946 }
3947
3948 transport_err:
3949 if (!signal_pending(current))
3950 atomic_set(&conn->transport_failed, 1);
3951 iscsit_take_action_for_connection_exit(conn);
3952 goto restart;
3953 out:
3954 return 0;
3955 }
3956
iscsit_release_commands_from_conn(struct iscsi_conn * conn)3957 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3958 {
3959 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3960 struct iscsi_session *sess = conn->sess;
3961 /*
3962 * We expect this function to only ever be called from either RX or TX
3963 * thread context via iscsit_close_connection() once the other context
3964 * has been reset -> returned sleeping pre-handler state.
3965 */
3966 spin_lock_bh(&conn->cmd_lock);
3967 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) {
3968
3969 list_del(&cmd->i_list);
3970 spin_unlock_bh(&conn->cmd_lock);
3971
3972 iscsit_increment_maxcmdsn(cmd, sess);
3973
3974 iscsit_free_cmd(cmd);
3975
3976 spin_lock_bh(&conn->cmd_lock);
3977 }
3978 spin_unlock_bh(&conn->cmd_lock);
3979 }
3980
iscsit_stop_timers_for_cmds(struct iscsi_conn * conn)3981 static void iscsit_stop_timers_for_cmds(
3982 struct iscsi_conn *conn)
3983 {
3984 struct iscsi_cmd *cmd;
3985
3986 spin_lock_bh(&conn->cmd_lock);
3987 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
3988 if (cmd->data_direction == DMA_TO_DEVICE)
3989 iscsit_stop_dataout_timer(cmd);
3990 }
3991 spin_unlock_bh(&conn->cmd_lock);
3992 }
3993
iscsit_close_connection(struct iscsi_conn * conn)3994 int iscsit_close_connection(
3995 struct iscsi_conn *conn)
3996 {
3997 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3998 struct iscsi_session *sess = conn->sess;
3999
4000 pr_debug("Closing iSCSI connection CID %hu on SID:"
4001 " %u\n", conn->cid, sess->sid);
4002 /*
4003 * Always up conn_logout_comp just in case the RX Thread is sleeping
4004 * and the logout response never got sent because the connection
4005 * failed.
4006 */
4007 complete(&conn->conn_logout_comp);
4008
4009 iscsi_release_thread_set(conn);
4010
4011 iscsit_stop_timers_for_cmds(conn);
4012 iscsit_stop_nopin_response_timer(conn);
4013 iscsit_stop_nopin_timer(conn);
4014 iscsit_free_queue_reqs_for_conn(conn);
4015
4016 /*
4017 * During Connection recovery drop unacknowledged out of order
4018 * commands for this connection, and prepare the other commands
4019 * for realligence.
4020 *
4021 * During normal operation clear the out of order commands (but
4022 * do not free the struct iscsi_ooo_cmdsn's) and release all
4023 * struct iscsi_cmds.
4024 */
4025 if (atomic_read(&conn->connection_recovery)) {
4026 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4027 iscsit_prepare_cmds_for_realligance(conn);
4028 } else {
4029 iscsit_clear_ooo_cmdsns_for_conn(conn);
4030 iscsit_release_commands_from_conn(conn);
4031 }
4032
4033 /*
4034 * Handle decrementing session or connection usage count if
4035 * a logout response was not able to be sent because the
4036 * connection failed. Fall back to Session Recovery here.
4037 */
4038 if (atomic_read(&conn->conn_logout_remove)) {
4039 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4040 iscsit_dec_conn_usage_count(conn);
4041 iscsit_dec_session_usage_count(sess);
4042 }
4043 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4044 iscsit_dec_conn_usage_count(conn);
4045
4046 atomic_set(&conn->conn_logout_remove, 0);
4047 atomic_set(&sess->session_reinstatement, 0);
4048 atomic_set(&sess->session_fall_back_to_erl0, 1);
4049 }
4050
4051 spin_lock_bh(&sess->conn_lock);
4052 list_del(&conn->conn_list);
4053
4054 /*
4055 * Attempt to let the Initiator know this connection failed by
4056 * sending an Connection Dropped Async Message on another
4057 * active connection.
4058 */
4059 if (atomic_read(&conn->connection_recovery))
4060 iscsit_build_conn_drop_async_message(conn);
4061
4062 spin_unlock_bh(&sess->conn_lock);
4063
4064 /*
4065 * If connection reinstatement is being performed on this connection,
4066 * up the connection reinstatement semaphore that is being blocked on
4067 * in iscsit_cause_connection_reinstatement().
4068 */
4069 spin_lock_bh(&conn->state_lock);
4070 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4071 spin_unlock_bh(&conn->state_lock);
4072 complete(&conn->conn_wait_comp);
4073 wait_for_completion(&conn->conn_post_wait_comp);
4074 spin_lock_bh(&conn->state_lock);
4075 }
4076
4077 /*
4078 * If connection reinstatement is being performed on this connection
4079 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4080 * connection wait rcfr semaphore that is being blocked on
4081 * an iscsit_connection_reinstatement_rcfr().
4082 */
4083 if (atomic_read(&conn->connection_wait_rcfr)) {
4084 spin_unlock_bh(&conn->state_lock);
4085 complete(&conn->conn_wait_rcfr_comp);
4086 wait_for_completion(&conn->conn_post_wait_comp);
4087 spin_lock_bh(&conn->state_lock);
4088 }
4089 atomic_set(&conn->connection_reinstatement, 1);
4090 spin_unlock_bh(&conn->state_lock);
4091
4092 /*
4093 * If any other processes are accessing this connection pointer we
4094 * must wait until they have completed.
4095 */
4096 iscsit_check_conn_usage_count(conn);
4097
4098 if (conn->conn_rx_hash.tfm)
4099 crypto_free_hash(conn->conn_rx_hash.tfm);
4100 if (conn->conn_tx_hash.tfm)
4101 crypto_free_hash(conn->conn_tx_hash.tfm);
4102
4103 if (conn->conn_cpumask)
4104 free_cpumask_var(conn->conn_cpumask);
4105
4106 kfree(conn->conn_ops);
4107 conn->conn_ops = NULL;
4108
4109 if (conn->sock) {
4110 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
4111 kfree(conn->sock->file);
4112 conn->sock->file = NULL;
4113 }
4114 sock_release(conn->sock);
4115 }
4116 conn->thread_set = NULL;
4117
4118 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4119 conn->conn_state = TARG_CONN_STATE_FREE;
4120 kfree(conn);
4121
4122 spin_lock_bh(&sess->conn_lock);
4123 atomic_dec(&sess->nconn);
4124 pr_debug("Decremented iSCSI connection count to %hu from node:"
4125 " %s\n", atomic_read(&sess->nconn),
4126 sess->sess_ops->InitiatorName);
4127 /*
4128 * Make sure that if one connection fails in an non ERL=2 iSCSI
4129 * Session that they all fail.
4130 */
4131 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4132 !atomic_read(&sess->session_logout))
4133 atomic_set(&sess->session_fall_back_to_erl0, 1);
4134
4135 /*
4136 * If this was not the last connection in the session, and we are
4137 * performing session reinstatement or falling back to ERL=0, call
4138 * iscsit_stop_session() without sleeping to shutdown the other
4139 * active connections.
4140 */
4141 if (atomic_read(&sess->nconn)) {
4142 if (!atomic_read(&sess->session_reinstatement) &&
4143 !atomic_read(&sess->session_fall_back_to_erl0)) {
4144 spin_unlock_bh(&sess->conn_lock);
4145 return 0;
4146 }
4147 if (!atomic_read(&sess->session_stop_active)) {
4148 atomic_set(&sess->session_stop_active, 1);
4149 spin_unlock_bh(&sess->conn_lock);
4150 iscsit_stop_session(sess, 0, 0);
4151 return 0;
4152 }
4153 spin_unlock_bh(&sess->conn_lock);
4154 return 0;
4155 }
4156
4157 /*
4158 * If this was the last connection in the session and one of the
4159 * following is occurring:
4160 *
4161 * Session Reinstatement is not being performed, and are falling back
4162 * to ERL=0 call iscsit_close_session().
4163 *
4164 * Session Logout was requested. iscsit_close_session() will be called
4165 * elsewhere.
4166 *
4167 * Session Continuation is not being performed, start the Time2Retain
4168 * handler and check if sleep_on_sess_wait_sem is active.
4169 */
4170 if (!atomic_read(&sess->session_reinstatement) &&
4171 atomic_read(&sess->session_fall_back_to_erl0)) {
4172 spin_unlock_bh(&sess->conn_lock);
4173 iscsit_close_session(sess);
4174
4175 return 0;
4176 } else if (atomic_read(&sess->session_logout)) {
4177 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4178 sess->session_state = TARG_SESS_STATE_FREE;
4179 spin_unlock_bh(&sess->conn_lock);
4180
4181 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4182 complete(&sess->session_wait_comp);
4183
4184 return 0;
4185 } else {
4186 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4187 sess->session_state = TARG_SESS_STATE_FAILED;
4188
4189 if (!atomic_read(&sess->session_continuation)) {
4190 spin_unlock_bh(&sess->conn_lock);
4191 iscsit_start_time2retain_handler(sess);
4192 } else
4193 spin_unlock_bh(&sess->conn_lock);
4194
4195 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4196 complete(&sess->session_wait_comp);
4197
4198 return 0;
4199 }
4200 spin_unlock_bh(&sess->conn_lock);
4201
4202 return 0;
4203 }
4204
iscsit_close_session(struct iscsi_session * sess)4205 int iscsit_close_session(struct iscsi_session *sess)
4206 {
4207 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4208 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4209
4210 if (atomic_read(&sess->nconn)) {
4211 pr_err("%d connection(s) still exist for iSCSI session"
4212 " to %s\n", atomic_read(&sess->nconn),
4213 sess->sess_ops->InitiatorName);
4214 BUG();
4215 }
4216
4217 spin_lock_bh(&se_tpg->session_lock);
4218 atomic_set(&sess->session_logout, 1);
4219 atomic_set(&sess->session_reinstatement, 1);
4220 iscsit_stop_time2retain_timer(sess);
4221 spin_unlock_bh(&se_tpg->session_lock);
4222
4223 /*
4224 * transport_deregister_session_configfs() will clear the
4225 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4226 * can be setting it again with __transport_register_session() in
4227 * iscsi_post_login_handler() again after the iscsit_stop_session()
4228 * completes in iscsi_np context.
4229 */
4230 transport_deregister_session_configfs(sess->se_sess);
4231
4232 /*
4233 * If any other processes are accessing this session pointer we must
4234 * wait until they have completed. If we are in an interrupt (the
4235 * time2retain handler) and contain and active session usage count we
4236 * restart the timer and exit.
4237 */
4238 if (!in_interrupt()) {
4239 if (iscsit_check_session_usage_count(sess) == 1)
4240 iscsit_stop_session(sess, 1, 1);
4241 } else {
4242 if (iscsit_check_session_usage_count(sess) == 2) {
4243 atomic_set(&sess->session_logout, 0);
4244 iscsit_start_time2retain_handler(sess);
4245 return 0;
4246 }
4247 }
4248
4249 transport_deregister_session(sess->se_sess);
4250
4251 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4252 iscsit_free_connection_recovery_entires(sess);
4253
4254 iscsit_free_all_ooo_cmdsns(sess);
4255
4256 spin_lock_bh(&se_tpg->session_lock);
4257 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4258 sess->session_state = TARG_SESS_STATE_FREE;
4259 pr_debug("Released iSCSI session from node: %s\n",
4260 sess->sess_ops->InitiatorName);
4261 tpg->nsessions--;
4262 if (tpg->tpg_tiqn)
4263 tpg->tpg_tiqn->tiqn_nsessions--;
4264
4265 pr_debug("Decremented number of active iSCSI Sessions on"
4266 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4267
4268 spin_lock(&sess_idr_lock);
4269 idr_remove(&sess_idr, sess->session_index);
4270 spin_unlock(&sess_idr_lock);
4271
4272 kfree(sess->sess_ops);
4273 sess->sess_ops = NULL;
4274 spin_unlock_bh(&se_tpg->session_lock);
4275
4276 kfree(sess);
4277 return 0;
4278 }
4279
iscsit_logout_post_handler_closesession(struct iscsi_conn * conn)4280 static void iscsit_logout_post_handler_closesession(
4281 struct iscsi_conn *conn)
4282 {
4283 struct iscsi_session *sess = conn->sess;
4284
4285 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4286 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4287
4288 atomic_set(&conn->conn_logout_remove, 0);
4289 complete(&conn->conn_logout_comp);
4290
4291 iscsit_dec_conn_usage_count(conn);
4292 iscsit_stop_session(sess, 1, 1);
4293 iscsit_dec_session_usage_count(sess);
4294 iscsit_close_session(sess);
4295 }
4296
iscsit_logout_post_handler_samecid(struct iscsi_conn * conn)4297 static void iscsit_logout_post_handler_samecid(
4298 struct iscsi_conn *conn)
4299 {
4300 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4301 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4302
4303 atomic_set(&conn->conn_logout_remove, 0);
4304 complete(&conn->conn_logout_comp);
4305
4306 iscsit_cause_connection_reinstatement(conn, 1);
4307 iscsit_dec_conn_usage_count(conn);
4308 }
4309
iscsit_logout_post_handler_diffcid(struct iscsi_conn * conn,u16 cid)4310 static void iscsit_logout_post_handler_diffcid(
4311 struct iscsi_conn *conn,
4312 u16 cid)
4313 {
4314 struct iscsi_conn *l_conn;
4315 struct iscsi_session *sess = conn->sess;
4316
4317 if (!sess)
4318 return;
4319
4320 spin_lock_bh(&sess->conn_lock);
4321 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4322 if (l_conn->cid == cid) {
4323 iscsit_inc_conn_usage_count(l_conn);
4324 break;
4325 }
4326 }
4327 spin_unlock_bh(&sess->conn_lock);
4328
4329 if (!l_conn)
4330 return;
4331
4332 if (l_conn->sock)
4333 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4334
4335 spin_lock_bh(&l_conn->state_lock);
4336 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4337 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4338 spin_unlock_bh(&l_conn->state_lock);
4339
4340 iscsit_cause_connection_reinstatement(l_conn, 1);
4341 iscsit_dec_conn_usage_count(l_conn);
4342 }
4343
4344 /*
4345 * Return of 0 causes the TX thread to restart.
4346 */
iscsit_logout_post_handler(struct iscsi_cmd * cmd,struct iscsi_conn * conn)4347 static int iscsit_logout_post_handler(
4348 struct iscsi_cmd *cmd,
4349 struct iscsi_conn *conn)
4350 {
4351 int ret = 0;
4352
4353 switch (cmd->logout_reason) {
4354 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4355 switch (cmd->logout_response) {
4356 case ISCSI_LOGOUT_SUCCESS:
4357 case ISCSI_LOGOUT_CLEANUP_FAILED:
4358 default:
4359 iscsit_logout_post_handler_closesession(conn);
4360 break;
4361 }
4362 ret = 0;
4363 break;
4364 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4365 if (conn->cid == cmd->logout_cid) {
4366 switch (cmd->logout_response) {
4367 case ISCSI_LOGOUT_SUCCESS:
4368 case ISCSI_LOGOUT_CLEANUP_FAILED:
4369 default:
4370 iscsit_logout_post_handler_samecid(conn);
4371 break;
4372 }
4373 ret = 0;
4374 } else {
4375 switch (cmd->logout_response) {
4376 case ISCSI_LOGOUT_SUCCESS:
4377 iscsit_logout_post_handler_diffcid(conn,
4378 cmd->logout_cid);
4379 break;
4380 case ISCSI_LOGOUT_CID_NOT_FOUND:
4381 case ISCSI_LOGOUT_CLEANUP_FAILED:
4382 default:
4383 break;
4384 }
4385 ret = 1;
4386 }
4387 break;
4388 case ISCSI_LOGOUT_REASON_RECOVERY:
4389 switch (cmd->logout_response) {
4390 case ISCSI_LOGOUT_SUCCESS:
4391 case ISCSI_LOGOUT_CID_NOT_FOUND:
4392 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4393 case ISCSI_LOGOUT_CLEANUP_FAILED:
4394 default:
4395 break;
4396 }
4397 ret = 1;
4398 break;
4399 default:
4400 break;
4401
4402 }
4403 return ret;
4404 }
4405
iscsit_fail_session(struct iscsi_session * sess)4406 void iscsit_fail_session(struct iscsi_session *sess)
4407 {
4408 struct iscsi_conn *conn;
4409
4410 spin_lock_bh(&sess->conn_lock);
4411 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4412 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4413 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4414 }
4415 spin_unlock_bh(&sess->conn_lock);
4416
4417 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4418 sess->session_state = TARG_SESS_STATE_FAILED;
4419 }
4420
iscsit_free_session(struct iscsi_session * sess)4421 int iscsit_free_session(struct iscsi_session *sess)
4422 {
4423 u16 conn_count = atomic_read(&sess->nconn);
4424 struct iscsi_conn *conn, *conn_tmp = NULL;
4425 int is_last;
4426
4427 spin_lock_bh(&sess->conn_lock);
4428 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4429
4430 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4431 conn_list) {
4432 if (conn_count == 0)
4433 break;
4434
4435 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4436 is_last = 1;
4437 } else {
4438 iscsit_inc_conn_usage_count(conn_tmp);
4439 is_last = 0;
4440 }
4441 iscsit_inc_conn_usage_count(conn);
4442
4443 spin_unlock_bh(&sess->conn_lock);
4444 iscsit_cause_connection_reinstatement(conn, 1);
4445 spin_lock_bh(&sess->conn_lock);
4446
4447 iscsit_dec_conn_usage_count(conn);
4448 if (is_last == 0)
4449 iscsit_dec_conn_usage_count(conn_tmp);
4450
4451 conn_count--;
4452 }
4453
4454 if (atomic_read(&sess->nconn)) {
4455 spin_unlock_bh(&sess->conn_lock);
4456 wait_for_completion(&sess->session_wait_comp);
4457 } else
4458 spin_unlock_bh(&sess->conn_lock);
4459
4460 iscsit_close_session(sess);
4461 return 0;
4462 }
4463
iscsit_stop_session(struct iscsi_session * sess,int session_sleep,int connection_sleep)4464 void iscsit_stop_session(
4465 struct iscsi_session *sess,
4466 int session_sleep,
4467 int connection_sleep)
4468 {
4469 u16 conn_count = atomic_read(&sess->nconn);
4470 struct iscsi_conn *conn, *conn_tmp = NULL;
4471 int is_last;
4472
4473 spin_lock_bh(&sess->conn_lock);
4474 if (session_sleep)
4475 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4476
4477 if (connection_sleep) {
4478 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4479 conn_list) {
4480 if (conn_count == 0)
4481 break;
4482
4483 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4484 is_last = 1;
4485 } else {
4486 iscsit_inc_conn_usage_count(conn_tmp);
4487 is_last = 0;
4488 }
4489 iscsit_inc_conn_usage_count(conn);
4490
4491 spin_unlock_bh(&sess->conn_lock);
4492 iscsit_cause_connection_reinstatement(conn, 1);
4493 spin_lock_bh(&sess->conn_lock);
4494
4495 iscsit_dec_conn_usage_count(conn);
4496 if (is_last == 0)
4497 iscsit_dec_conn_usage_count(conn_tmp);
4498 conn_count--;
4499 }
4500 } else {
4501 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4502 iscsit_cause_connection_reinstatement(conn, 0);
4503 }
4504
4505 if (session_sleep && atomic_read(&sess->nconn)) {
4506 spin_unlock_bh(&sess->conn_lock);
4507 wait_for_completion(&sess->session_wait_comp);
4508 } else
4509 spin_unlock_bh(&sess->conn_lock);
4510 }
4511
iscsit_release_sessions_for_tpg(struct iscsi_portal_group * tpg,int force)4512 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4513 {
4514 struct iscsi_session *sess;
4515 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4516 struct se_session *se_sess, *se_sess_tmp;
4517 int session_count = 0;
4518
4519 spin_lock_bh(&se_tpg->session_lock);
4520 if (tpg->nsessions && !force) {
4521 spin_unlock_bh(&se_tpg->session_lock);
4522 return -1;
4523 }
4524
4525 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4526 sess_list) {
4527 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4528
4529 spin_lock(&sess->conn_lock);
4530 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4531 atomic_read(&sess->session_logout) ||
4532 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4533 spin_unlock(&sess->conn_lock);
4534 continue;
4535 }
4536 atomic_set(&sess->session_reinstatement, 1);
4537 spin_unlock(&sess->conn_lock);
4538 spin_unlock_bh(&se_tpg->session_lock);
4539
4540 iscsit_free_session(sess);
4541 spin_lock_bh(&se_tpg->session_lock);
4542
4543 session_count++;
4544 }
4545 spin_unlock_bh(&se_tpg->session_lock);
4546
4547 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4548 " Group: %hu\n", session_count, tpg->tpgt);
4549 return 0;
4550 }
4551
4552 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4553 MODULE_VERSION("4.1.x");
4554 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4555 MODULE_LICENSE("GPL");
4556
4557 module_init(iscsi_target_init_module);
4558 module_exit(iscsi_target_cleanup_module);
4559