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 <linux/idr.h>
27 #include <asm/unaligned.h>
28 #include <scsi/scsi_device.h>
29 #include <scsi/iscsi_proto.h>
30 #include <target/target_core_base.h>
31 #include <target/target_core_fabric.h>
32
33 #include "iscsi_target_core.h"
34 #include "iscsi_target_parameters.h"
35 #include "iscsi_target_seq_pdu_list.h"
36 #include "iscsi_target_tq.h"
37 #include "iscsi_target_configfs.h"
38 #include "iscsi_target_datain_values.h"
39 #include "iscsi_target_erl0.h"
40 #include "iscsi_target_erl1.h"
41 #include "iscsi_target_erl2.h"
42 #include "iscsi_target_login.h"
43 #include "iscsi_target_tmr.h"
44 #include "iscsi_target_tpg.h"
45 #include "iscsi_target_util.h"
46 #include "iscsi_target.h"
47 #include "iscsi_target_device.h"
48 #include "iscsi_target_stat.h"
49
50 static LIST_HEAD(g_tiqn_list);
51 static LIST_HEAD(g_np_list);
52 static DEFINE_SPINLOCK(tiqn_lock);
53 static DEFINE_SPINLOCK(np_lock);
54
55 static struct idr tiqn_idr;
56 struct idr sess_idr;
57 struct mutex auth_id_lock;
58 spinlock_t sess_idr_lock;
59
60 struct iscsit_global *iscsit_global;
61
62 struct kmem_cache *lio_cmd_cache;
63 struct kmem_cache *lio_qr_cache;
64 struct kmem_cache *lio_dr_cache;
65 struct kmem_cache *lio_ooo_cache;
66 struct kmem_cache *lio_r2t_cache;
67
68 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
69 unsigned char *buf, u32);
70 static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
71
iscsit_get_tiqn_for_login(unsigned char * buf)72 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
73 {
74 struct iscsi_tiqn *tiqn = NULL;
75
76 spin_lock(&tiqn_lock);
77 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
78 if (!strcmp(tiqn->tiqn, buf)) {
79
80 spin_lock(&tiqn->tiqn_state_lock);
81 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
82 tiqn->tiqn_access_count++;
83 spin_unlock(&tiqn->tiqn_state_lock);
84 spin_unlock(&tiqn_lock);
85 return tiqn;
86 }
87 spin_unlock(&tiqn->tiqn_state_lock);
88 }
89 }
90 spin_unlock(&tiqn_lock);
91
92 return NULL;
93 }
94
iscsit_set_tiqn_shutdown(struct iscsi_tiqn * tiqn)95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
96 {
97 spin_lock(&tiqn->tiqn_state_lock);
98 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
99 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
100 spin_unlock(&tiqn->tiqn_state_lock);
101 return 0;
102 }
103 spin_unlock(&tiqn->tiqn_state_lock);
104
105 return -1;
106 }
107
iscsit_put_tiqn_for_login(struct iscsi_tiqn * tiqn)108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
109 {
110 spin_lock(&tiqn->tiqn_state_lock);
111 tiqn->tiqn_access_count--;
112 spin_unlock(&tiqn->tiqn_state_lock);
113 }
114
115 /*
116 * Note that IQN formatting is expected to be done in userspace, and
117 * no explict IQN format checks are done here.
118 */
iscsit_add_tiqn(unsigned char * buf)119 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
120 {
121 struct iscsi_tiqn *tiqn = NULL;
122 int ret;
123
124 if (strlen(buf) >= ISCSI_IQN_LEN) {
125 pr_err("Target IQN exceeds %d bytes\n",
126 ISCSI_IQN_LEN);
127 return ERR_PTR(-EINVAL);
128 }
129
130 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
131 if (!tiqn) {
132 pr_err("Unable to allocate struct iscsi_tiqn\n");
133 return ERR_PTR(-ENOMEM);
134 }
135
136 sprintf(tiqn->tiqn, "%s", buf);
137 INIT_LIST_HEAD(&tiqn->tiqn_list);
138 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
139 spin_lock_init(&tiqn->tiqn_state_lock);
140 spin_lock_init(&tiqn->tiqn_tpg_lock);
141 spin_lock_init(&tiqn->sess_err_stats.lock);
142 spin_lock_init(&tiqn->login_stats.lock);
143 spin_lock_init(&tiqn->logout_stats.lock);
144
145 if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) {
146 pr_err("idr_pre_get() for tiqn_idr failed\n");
147 kfree(tiqn);
148 return ERR_PTR(-ENOMEM);
149 }
150 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
151
152 spin_lock(&tiqn_lock);
153 ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index);
154 if (ret < 0) {
155 pr_err("idr_get_new() failed for tiqn->tiqn_index\n");
156 spin_unlock(&tiqn_lock);
157 kfree(tiqn);
158 return ERR_PTR(ret);
159 }
160 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
161 spin_unlock(&tiqn_lock);
162
163 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
164
165 return tiqn;
166
167 }
168
iscsit_wait_for_tiqn(struct iscsi_tiqn * tiqn)169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
170 {
171 /*
172 * Wait for accesses to said struct iscsi_tiqn to end.
173 */
174 spin_lock(&tiqn->tiqn_state_lock);
175 while (tiqn->tiqn_access_count != 0) {
176 spin_unlock(&tiqn->tiqn_state_lock);
177 msleep(10);
178 spin_lock(&tiqn->tiqn_state_lock);
179 }
180 spin_unlock(&tiqn->tiqn_state_lock);
181 }
182
iscsit_del_tiqn(struct iscsi_tiqn * tiqn)183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
184 {
185 /*
186 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
187 * while holding tiqn->tiqn_state_lock. This means that all subsequent
188 * attempts to access this struct iscsi_tiqn will fail from both transport
189 * fabric and control code paths.
190 */
191 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
192 pr_err("iscsit_set_tiqn_shutdown() failed\n");
193 return;
194 }
195
196 iscsit_wait_for_tiqn(tiqn);
197
198 spin_lock(&tiqn_lock);
199 list_del(&tiqn->tiqn_list);
200 idr_remove(&tiqn_idr, tiqn->tiqn_index);
201 spin_unlock(&tiqn_lock);
202
203 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
204 tiqn->tiqn);
205 kfree(tiqn);
206 }
207
iscsit_access_np(struct iscsi_np * np,struct iscsi_portal_group * tpg)208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
209 {
210 int ret;
211 /*
212 * Determine if the network portal is accepting storage traffic.
213 */
214 spin_lock_bh(&np->np_thread_lock);
215 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
216 spin_unlock_bh(&np->np_thread_lock);
217 return -1;
218 }
219 if (np->np_login_tpg) {
220 pr_err("np->np_login_tpg() is not NULL!\n");
221 spin_unlock_bh(&np->np_thread_lock);
222 return -1;
223 }
224 spin_unlock_bh(&np->np_thread_lock);
225 /*
226 * Determine if the portal group is accepting storage traffic.
227 */
228 spin_lock_bh(&tpg->tpg_state_lock);
229 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
230 spin_unlock_bh(&tpg->tpg_state_lock);
231 return -1;
232 }
233 spin_unlock_bh(&tpg->tpg_state_lock);
234
235 /*
236 * Here we serialize access across the TIQN+TPG Tuple.
237 */
238 ret = mutex_lock_interruptible(&tpg->np_login_lock);
239 if ((ret != 0) || signal_pending(current))
240 return -1;
241
242 spin_lock_bh(&np->np_thread_lock);
243 np->np_login_tpg = tpg;
244 spin_unlock_bh(&np->np_thread_lock);
245
246 return 0;
247 }
248
iscsit_deaccess_np(struct iscsi_np * np,struct iscsi_portal_group * tpg)249 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
250 {
251 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
252
253 spin_lock_bh(&np->np_thread_lock);
254 np->np_login_tpg = NULL;
255 spin_unlock_bh(&np->np_thread_lock);
256
257 mutex_unlock(&tpg->np_login_lock);
258
259 if (tiqn)
260 iscsit_put_tiqn_for_login(tiqn);
261
262 return 0;
263 }
264
iscsit_get_np(struct __kernel_sockaddr_storage * sockaddr,int network_transport)265 static struct iscsi_np *iscsit_get_np(
266 struct __kernel_sockaddr_storage *sockaddr,
267 int network_transport)
268 {
269 struct sockaddr_in *sock_in, *sock_in_e;
270 struct sockaddr_in6 *sock_in6, *sock_in6_e;
271 struct iscsi_np *np;
272 int ip_match = 0;
273 u16 port;
274
275 spin_lock_bh(&np_lock);
276 list_for_each_entry(np, &g_np_list, np_list) {
277 spin_lock(&np->np_thread_lock);
278 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
279 spin_unlock(&np->np_thread_lock);
280 continue;
281 }
282
283 if (sockaddr->ss_family == AF_INET6) {
284 sock_in6 = (struct sockaddr_in6 *)sockaddr;
285 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
286
287 if (!memcmp(&sock_in6->sin6_addr.in6_u,
288 &sock_in6_e->sin6_addr.in6_u,
289 sizeof(struct in6_addr)))
290 ip_match = 1;
291
292 port = ntohs(sock_in6->sin6_port);
293 } else {
294 sock_in = (struct sockaddr_in *)sockaddr;
295 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
296
297 if (sock_in->sin_addr.s_addr ==
298 sock_in_e->sin_addr.s_addr)
299 ip_match = 1;
300
301 port = ntohs(sock_in->sin_port);
302 }
303
304 if ((ip_match == 1) && (np->np_port == port) &&
305 (np->np_network_transport == network_transport)) {
306 /*
307 * Increment the np_exports reference count now to
308 * prevent iscsit_del_np() below from being called
309 * while iscsi_tpg_add_network_portal() is called.
310 */
311 np->np_exports++;
312 spin_unlock(&np->np_thread_lock);
313 spin_unlock_bh(&np_lock);
314 return np;
315 }
316 spin_unlock(&np->np_thread_lock);
317 }
318 spin_unlock_bh(&np_lock);
319
320 return NULL;
321 }
322
iscsit_add_np(struct __kernel_sockaddr_storage * sockaddr,char * ip_str,int network_transport)323 struct iscsi_np *iscsit_add_np(
324 struct __kernel_sockaddr_storage *sockaddr,
325 char *ip_str,
326 int network_transport)
327 {
328 struct sockaddr_in *sock_in;
329 struct sockaddr_in6 *sock_in6;
330 struct iscsi_np *np;
331 int ret;
332 /*
333 * Locate the existing struct iscsi_np if already active..
334 */
335 np = iscsit_get_np(sockaddr, network_transport);
336 if (np)
337 return np;
338
339 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
340 if (!np) {
341 pr_err("Unable to allocate memory for struct iscsi_np\n");
342 return ERR_PTR(-ENOMEM);
343 }
344
345 np->np_flags |= NPF_IP_NETWORK;
346 if (sockaddr->ss_family == AF_INET6) {
347 sock_in6 = (struct sockaddr_in6 *)sockaddr;
348 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
349 np->np_port = ntohs(sock_in6->sin6_port);
350 } else {
351 sock_in = (struct sockaddr_in *)sockaddr;
352 sprintf(np->np_ip, "%s", ip_str);
353 np->np_port = ntohs(sock_in->sin_port);
354 }
355
356 np->np_network_transport = network_transport;
357 spin_lock_init(&np->np_thread_lock);
358 init_completion(&np->np_restart_comp);
359 INIT_LIST_HEAD(&np->np_list);
360
361 ret = iscsi_target_setup_login_socket(np, sockaddr);
362 if (ret != 0) {
363 kfree(np);
364 return ERR_PTR(ret);
365 }
366
367 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
368 if (IS_ERR(np->np_thread)) {
369 pr_err("Unable to create kthread: iscsi_np\n");
370 ret = PTR_ERR(np->np_thread);
371 kfree(np);
372 return ERR_PTR(ret);
373 }
374 /*
375 * Increment the np_exports reference count now to prevent
376 * iscsit_del_np() below from being run while a new call to
377 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
378 * active. We don't need to hold np->np_thread_lock at this
379 * point because iscsi_np has not been added to g_np_list yet.
380 */
381 np->np_exports = 1;
382
383 spin_lock_bh(&np_lock);
384 list_add_tail(&np->np_list, &g_np_list);
385 spin_unlock_bh(&np_lock);
386
387 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
388 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
389 "TCP" : "SCTP");
390
391 return np;
392 }
393
iscsit_reset_np_thread(struct iscsi_np * np,struct iscsi_tpg_np * tpg_np,struct iscsi_portal_group * tpg)394 int iscsit_reset_np_thread(
395 struct iscsi_np *np,
396 struct iscsi_tpg_np *tpg_np,
397 struct iscsi_portal_group *tpg)
398 {
399 spin_lock_bh(&np->np_thread_lock);
400 if (tpg && tpg_np) {
401 /*
402 * The reset operation need only be performed when the
403 * passed struct iscsi_portal_group has a login in progress
404 * to one of the network portals.
405 */
406 if (tpg_np->tpg_np->np_login_tpg != tpg) {
407 spin_unlock_bh(&np->np_thread_lock);
408 return 0;
409 }
410 }
411 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
412 spin_unlock_bh(&np->np_thread_lock);
413 return 0;
414 }
415 np->np_thread_state = ISCSI_NP_THREAD_RESET;
416
417 if (np->np_thread) {
418 spin_unlock_bh(&np->np_thread_lock);
419 send_sig(SIGINT, np->np_thread, 1);
420 wait_for_completion(&np->np_restart_comp);
421 spin_lock_bh(&np->np_thread_lock);
422 }
423 spin_unlock_bh(&np->np_thread_lock);
424
425 return 0;
426 }
427
iscsit_del_np_comm(struct iscsi_np * np)428 int iscsit_del_np_comm(struct iscsi_np *np)
429 {
430 if (np->np_socket)
431 sock_release(np->np_socket);
432 return 0;
433 }
434
iscsit_del_np(struct iscsi_np * np)435 int iscsit_del_np(struct iscsi_np *np)
436 {
437 spin_lock_bh(&np->np_thread_lock);
438 np->np_exports--;
439 if (np->np_exports) {
440 spin_unlock_bh(&np->np_thread_lock);
441 return 0;
442 }
443 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
444 spin_unlock_bh(&np->np_thread_lock);
445
446 if (np->np_thread) {
447 /*
448 * We need to send the signal to wakeup Linux/Net
449 * which may be sleeping in sock_accept()..
450 */
451 send_sig(SIGINT, np->np_thread, 1);
452 kthread_stop(np->np_thread);
453 }
454 iscsit_del_np_comm(np);
455
456 spin_lock_bh(&np_lock);
457 list_del(&np->np_list);
458 spin_unlock_bh(&np_lock);
459
460 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
461 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
462 "TCP" : "SCTP");
463
464 kfree(np);
465 return 0;
466 }
467
iscsi_target_init_module(void)468 static int __init iscsi_target_init_module(void)
469 {
470 int ret = 0;
471
472 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
473
474 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
475 if (!iscsit_global) {
476 pr_err("Unable to allocate memory for iscsit_global\n");
477 return -1;
478 }
479 mutex_init(&auth_id_lock);
480 spin_lock_init(&sess_idr_lock);
481 idr_init(&tiqn_idr);
482 idr_init(&sess_idr);
483
484 ret = iscsi_target_register_configfs();
485 if (ret < 0)
486 goto out;
487
488 ret = iscsi_thread_set_init();
489 if (ret < 0)
490 goto configfs_out;
491
492 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
493 TARGET_THREAD_SET_COUNT) {
494 pr_err("iscsi_allocate_thread_sets() returned"
495 " unexpected value!\n");
496 goto ts_out1;
497 }
498
499 lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
500 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
501 0, NULL);
502 if (!lio_cmd_cache) {
503 pr_err("Unable to kmem_cache_create() for"
504 " lio_cmd_cache\n");
505 goto ts_out2;
506 }
507
508 lio_qr_cache = kmem_cache_create("lio_qr_cache",
509 sizeof(struct iscsi_queue_req),
510 __alignof__(struct iscsi_queue_req), 0, NULL);
511 if (!lio_qr_cache) {
512 pr_err("nable to kmem_cache_create() for"
513 " lio_qr_cache\n");
514 goto cmd_out;
515 }
516
517 lio_dr_cache = kmem_cache_create("lio_dr_cache",
518 sizeof(struct iscsi_datain_req),
519 __alignof__(struct iscsi_datain_req), 0, NULL);
520 if (!lio_dr_cache) {
521 pr_err("Unable to kmem_cache_create() for"
522 " lio_dr_cache\n");
523 goto qr_out;
524 }
525
526 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
527 sizeof(struct iscsi_ooo_cmdsn),
528 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
529 if (!lio_ooo_cache) {
530 pr_err("Unable to kmem_cache_create() for"
531 " lio_ooo_cache\n");
532 goto dr_out;
533 }
534
535 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
536 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
537 0, NULL);
538 if (!lio_r2t_cache) {
539 pr_err("Unable to kmem_cache_create() for"
540 " lio_r2t_cache\n");
541 goto ooo_out;
542 }
543
544 if (iscsit_load_discovery_tpg() < 0)
545 goto r2t_out;
546
547 return ret;
548 r2t_out:
549 kmem_cache_destroy(lio_r2t_cache);
550 ooo_out:
551 kmem_cache_destroy(lio_ooo_cache);
552 dr_out:
553 kmem_cache_destroy(lio_dr_cache);
554 qr_out:
555 kmem_cache_destroy(lio_qr_cache);
556 cmd_out:
557 kmem_cache_destroy(lio_cmd_cache);
558 ts_out2:
559 iscsi_deallocate_thread_sets();
560 ts_out1:
561 iscsi_thread_set_free();
562 configfs_out:
563 iscsi_target_deregister_configfs();
564 out:
565 kfree(iscsit_global);
566 return -ENOMEM;
567 }
568
iscsi_target_cleanup_module(void)569 static void __exit iscsi_target_cleanup_module(void)
570 {
571 iscsi_deallocate_thread_sets();
572 iscsi_thread_set_free();
573 iscsit_release_discovery_tpg();
574 kmem_cache_destroy(lio_cmd_cache);
575 kmem_cache_destroy(lio_qr_cache);
576 kmem_cache_destroy(lio_dr_cache);
577 kmem_cache_destroy(lio_ooo_cache);
578 kmem_cache_destroy(lio_r2t_cache);
579
580 iscsi_target_deregister_configfs();
581
582 kfree(iscsit_global);
583 }
584
iscsit_add_reject(u8 reason,int fail_conn,unsigned char * buf,struct iscsi_conn * conn)585 int iscsit_add_reject(
586 u8 reason,
587 int fail_conn,
588 unsigned char *buf,
589 struct iscsi_conn *conn)
590 {
591 struct iscsi_cmd *cmd;
592 struct iscsi_reject *hdr;
593 int ret;
594
595 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
596 if (!cmd)
597 return -1;
598
599 cmd->iscsi_opcode = ISCSI_OP_REJECT;
600 if (fail_conn)
601 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
602
603 hdr = (struct iscsi_reject *) cmd->pdu;
604 hdr->reason = reason;
605
606 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
607 if (!cmd->buf_ptr) {
608 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
609 iscsit_release_cmd(cmd);
610 return -1;
611 }
612
613 spin_lock_bh(&conn->cmd_lock);
614 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
615 spin_unlock_bh(&conn->cmd_lock);
616
617 cmd->i_state = ISTATE_SEND_REJECT;
618 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
619
620 ret = wait_for_completion_interruptible(&cmd->reject_comp);
621 if (ret != 0)
622 return -1;
623
624 return (!fail_conn) ? 0 : -1;
625 }
626
iscsit_add_reject_from_cmd(u8 reason,int fail_conn,int add_to_conn,unsigned char * buf,struct iscsi_cmd * cmd)627 int iscsit_add_reject_from_cmd(
628 u8 reason,
629 int fail_conn,
630 int add_to_conn,
631 unsigned char *buf,
632 struct iscsi_cmd *cmd)
633 {
634 struct iscsi_conn *conn;
635 struct iscsi_reject *hdr;
636 int ret;
637
638 if (!cmd->conn) {
639 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
640 cmd->init_task_tag);
641 return -1;
642 }
643 conn = cmd->conn;
644
645 cmd->iscsi_opcode = ISCSI_OP_REJECT;
646 if (fail_conn)
647 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
648
649 hdr = (struct iscsi_reject *) cmd->pdu;
650 hdr->reason = reason;
651
652 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
653 if (!cmd->buf_ptr) {
654 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
655 iscsit_release_cmd(cmd);
656 return -1;
657 }
658
659 if (add_to_conn) {
660 spin_lock_bh(&conn->cmd_lock);
661 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
662 spin_unlock_bh(&conn->cmd_lock);
663 }
664
665 cmd->i_state = ISTATE_SEND_REJECT;
666 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
667
668 ret = wait_for_completion_interruptible(&cmd->reject_comp);
669 if (ret != 0)
670 return -1;
671
672 return (!fail_conn) ? 0 : -1;
673 }
674
675 /*
676 * Map some portion of the allocated scatterlist to an iovec, suitable for
677 * kernel sockets to copy data in/out. This handles both pages and slab-allocated
678 * buffers, since we have been tricky and mapped t_mem_sg to the buffer in
679 * either case (see iscsit_alloc_buffs)
680 */
iscsit_map_iovec(struct iscsi_cmd * cmd,struct kvec * iov,u32 data_offset,u32 data_length)681 static int iscsit_map_iovec(
682 struct iscsi_cmd *cmd,
683 struct kvec *iov,
684 u32 data_offset,
685 u32 data_length)
686 {
687 u32 i = 0;
688 struct scatterlist *sg;
689 unsigned int page_off;
690
691 /*
692 * We have a private mapping of the allocated pages in t_mem_sg.
693 * At this point, we also know each contains a page.
694 */
695 sg = &cmd->t_mem_sg[data_offset / PAGE_SIZE];
696 page_off = (data_offset % PAGE_SIZE);
697
698 cmd->first_data_sg = sg;
699 cmd->first_data_sg_off = page_off;
700
701 while (data_length) {
702 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
703
704 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
705 iov[i].iov_len = cur_len;
706
707 data_length -= cur_len;
708 page_off = 0;
709 sg = sg_next(sg);
710 i++;
711 }
712
713 cmd->kmapped_nents = i;
714
715 return i;
716 }
717
iscsit_unmap_iovec(struct iscsi_cmd * cmd)718 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
719 {
720 u32 i;
721 struct scatterlist *sg;
722
723 sg = cmd->first_data_sg;
724
725 for (i = 0; i < cmd->kmapped_nents; i++)
726 kunmap(sg_page(&sg[i]));
727 }
728
iscsit_ack_from_expstatsn(struct iscsi_conn * conn,u32 exp_statsn)729 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
730 {
731 struct iscsi_cmd *cmd;
732
733 conn->exp_statsn = exp_statsn;
734
735 spin_lock_bh(&conn->cmd_lock);
736 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
737 spin_lock(&cmd->istate_lock);
738 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
739 (cmd->stat_sn < exp_statsn)) {
740 cmd->i_state = ISTATE_REMOVE;
741 spin_unlock(&cmd->istate_lock);
742 iscsit_add_cmd_to_immediate_queue(cmd, conn,
743 cmd->i_state);
744 continue;
745 }
746 spin_unlock(&cmd->istate_lock);
747 }
748 spin_unlock_bh(&conn->cmd_lock);
749 }
750
iscsit_allocate_iovecs(struct iscsi_cmd * cmd)751 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
752 {
753 u32 iov_count = (cmd->se_cmd.t_data_nents == 0) ? 1 :
754 cmd->se_cmd.t_data_nents;
755
756 iov_count += ISCSI_IOV_DATA_BUFFER;
757
758 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
759 if (!cmd->iov_data) {
760 pr_err("Unable to allocate cmd->iov_data\n");
761 return -ENOMEM;
762 }
763
764 cmd->orig_iov_data_count = iov_count;
765 return 0;
766 }
767
iscsit_alloc_buffs(struct iscsi_cmd * cmd)768 static int iscsit_alloc_buffs(struct iscsi_cmd *cmd)
769 {
770 struct scatterlist *sgl;
771 u32 length = cmd->se_cmd.data_length;
772 int nents = DIV_ROUND_UP(length, PAGE_SIZE);
773 int i = 0, j = 0, ret;
774 /*
775 * If no SCSI payload is present, allocate the default iovecs used for
776 * iSCSI PDU Header
777 */
778 if (!length)
779 return iscsit_allocate_iovecs(cmd);
780
781 sgl = kzalloc(sizeof(*sgl) * nents, GFP_KERNEL);
782 if (!sgl)
783 return -ENOMEM;
784
785 sg_init_table(sgl, nents);
786
787 while (length) {
788 int buf_size = min_t(int, length, PAGE_SIZE);
789 struct page *page;
790
791 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
792 if (!page)
793 goto page_alloc_failed;
794
795 sg_set_page(&sgl[i], page, buf_size, 0);
796
797 length -= buf_size;
798 i++;
799 }
800
801 cmd->t_mem_sg = sgl;
802 cmd->t_mem_sg_nents = nents;
803
804 /* BIDI ops not supported */
805
806 /* Tell the core about our preallocated memory */
807 transport_generic_map_mem_to_cmd(&cmd->se_cmd, sgl, nents, NULL, 0);
808 /*
809 * Allocate iovecs for SCSI payload after transport_generic_map_mem_to_cmd
810 * so that cmd->se_cmd.t_tasks_se_num has been set.
811 */
812 ret = iscsit_allocate_iovecs(cmd);
813 if (ret < 0)
814 return -ENOMEM;
815
816 return 0;
817
818 page_alloc_failed:
819 while (j < i)
820 __free_page(sg_page(&sgl[j++]));
821
822 kfree(sgl);
823 return -ENOMEM;
824 }
825
iscsit_handle_scsi_cmd(struct iscsi_conn * conn,unsigned char * buf)826 static int iscsit_handle_scsi_cmd(
827 struct iscsi_conn *conn,
828 unsigned char *buf)
829 {
830 int data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
831 int dump_immediate_data = 0, send_check_condition = 0, payload_length;
832 struct iscsi_cmd *cmd = NULL;
833 struct iscsi_scsi_req *hdr;
834
835 spin_lock_bh(&conn->sess->session_stats_lock);
836 conn->sess->cmd_pdus++;
837 if (conn->sess->se_sess->se_node_acl) {
838 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
839 conn->sess->se_sess->se_node_acl->num_cmds++;
840 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
841 }
842 spin_unlock_bh(&conn->sess->session_stats_lock);
843
844 hdr = (struct iscsi_scsi_req *) buf;
845 payload_length = ntoh24(hdr->dlength);
846 hdr->itt = be32_to_cpu(hdr->itt);
847 hdr->data_length = be32_to_cpu(hdr->data_length);
848 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
849 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
850
851 /* FIXME; Add checks for AdditionalHeaderSegment */
852
853 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
854 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
855 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
856 " not set. Bad iSCSI Initiator.\n");
857 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
858 buf, conn);
859 }
860
861 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
862 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
863 /*
864 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
865 * that adds support for RESERVE/RELEASE. There is a bug
866 * add with this new functionality that sets R/W bits when
867 * neither CDB carries any READ or WRITE datapayloads.
868 */
869 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
870 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
871 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
872 goto done;
873 }
874
875 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
876 " set when Expected Data Transfer Length is 0 for"
877 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
878 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
879 buf, conn);
880 }
881 done:
882
883 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
884 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
885 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
886 " MUST be set if Expected Data Transfer Length is not 0."
887 " Bad iSCSI Initiator\n");
888 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
889 buf, conn);
890 }
891
892 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
893 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
894 pr_err("Bidirectional operations not supported!\n");
895 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
896 buf, conn);
897 }
898
899 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
900 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
901 " Scsi Command PDU.\n");
902 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
903 buf, conn);
904 }
905
906 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
907 pr_err("ImmediateData=No but DataSegmentLength=%u,"
908 " protocol error.\n", payload_length);
909 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
910 buf, conn);
911 }
912
913 if ((hdr->data_length == payload_length) &&
914 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
915 pr_err("Expected Data Transfer Length and Length of"
916 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
917 " bit is not set protocol error\n");
918 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
919 buf, conn);
920 }
921
922 if (payload_length > hdr->data_length) {
923 pr_err("DataSegmentLength: %u is greater than"
924 " EDTL: %u, protocol error.\n", payload_length,
925 hdr->data_length);
926 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
927 buf, conn);
928 }
929
930 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
931 pr_err("DataSegmentLength: %u is greater than"
932 " MaxRecvDataSegmentLength: %u, protocol error.\n",
933 payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
934 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
935 buf, conn);
936 }
937
938 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
939 pr_err("DataSegmentLength: %u is greater than"
940 " FirstBurstLength: %u, protocol error.\n",
941 payload_length, conn->sess->sess_ops->FirstBurstLength);
942 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
943 buf, conn);
944 }
945
946 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
947 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
948 DMA_NONE;
949
950 cmd = iscsit_allocate_se_cmd(conn, hdr->data_length, data_direction,
951 (hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK));
952 if (!cmd)
953 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
954 buf, conn);
955
956 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
957 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
958 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
959
960 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
961 cmd->i_state = ISTATE_NEW_CMD;
962 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
963 cmd->immediate_data = (payload_length) ? 1 : 0;
964 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
965 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
966 if (cmd->unsolicited_data)
967 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
968
969 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
970 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
971 spin_lock_bh(&conn->sess->ttt_lock);
972 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
973 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
974 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
975 spin_unlock_bh(&conn->sess->ttt_lock);
976 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
977 cmd->targ_xfer_tag = 0xFFFFFFFF;
978 cmd->cmd_sn = hdr->cmdsn;
979 cmd->exp_stat_sn = hdr->exp_statsn;
980 cmd->first_burst_len = payload_length;
981
982 if (cmd->data_direction == DMA_FROM_DEVICE) {
983 struct iscsi_datain_req *dr;
984
985 dr = iscsit_allocate_datain_req();
986 if (!dr)
987 return iscsit_add_reject_from_cmd(
988 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
989 1, 1, buf, cmd);
990
991 iscsit_attach_datain_req(cmd, dr);
992 }
993
994 /*
995 * The CDB is going to an se_device_t.
996 */
997 ret = transport_lookup_cmd_lun(&cmd->se_cmd,
998 scsilun_to_int(&hdr->lun));
999 if (ret < 0) {
1000 if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
1001 pr_debug("Responding to non-acl'ed,"
1002 " non-existent or non-exported iSCSI LUN:"
1003 " 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
1004 }
1005 send_check_condition = 1;
1006 goto attach_cmd;
1007 }
1008 /*
1009 * The Initiator Node has access to the LUN (the addressing method
1010 * is handled inside of iscsit_get_lun_for_cmd()). Now it's time to
1011 * allocate 1->N transport tasks (depending on sector count and
1012 * maximum request size the physical HBA(s) can handle.
1013 */
1014 transport_ret = transport_generic_allocate_tasks(&cmd->se_cmd, hdr->cdb);
1015 if (transport_ret == -ENOMEM) {
1016 return iscsit_add_reject_from_cmd(
1017 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1018 1, 1, buf, cmd);
1019 } else if (transport_ret < 0) {
1020 /*
1021 * Unsupported SAM Opcode. CHECK_CONDITION will be sent
1022 * in iscsit_execute_cmd() during the CmdSN OOO Execution
1023 * Mechinism.
1024 */
1025 send_check_condition = 1;
1026 } else {
1027 cmd->data_length = cmd->se_cmd.data_length;
1028
1029 if (iscsit_decide_list_to_build(cmd, payload_length) < 0)
1030 return iscsit_add_reject_from_cmd(
1031 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1032 1, 1, buf, cmd);
1033 }
1034
1035 attach_cmd:
1036 spin_lock_bh(&conn->cmd_lock);
1037 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1038 spin_unlock_bh(&conn->cmd_lock);
1039 /*
1040 * Check if we need to delay processing because of ALUA
1041 * Active/NonOptimized primary access state..
1042 */
1043 core_alua_check_nonop_delay(&cmd->se_cmd);
1044 /*
1045 * Allocate and setup SGL used with transport_generic_map_mem_to_cmd().
1046 * also call iscsit_allocate_iovecs()
1047 */
1048 ret = iscsit_alloc_buffs(cmd);
1049 if (ret < 0)
1050 return iscsit_add_reject_from_cmd(
1051 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1052 1, 0, buf, cmd);
1053 /*
1054 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1055 * the Immediate Bit is not set, and no Immediate
1056 * Data is attached.
1057 *
1058 * A PDU/CmdSN carrying Immediate Data can only
1059 * be processed after the DataCRC has passed.
1060 * If the DataCRC fails, the CmdSN MUST NOT
1061 * be acknowledged. (See below)
1062 */
1063 if (!cmd->immediate_data) {
1064 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1065 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1066 return 0;
1067 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1068 return iscsit_add_reject_from_cmd(
1069 ISCSI_REASON_PROTOCOL_ERROR,
1070 1, 0, buf, cmd);
1071 }
1072
1073 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1074
1075 /*
1076 * If no Immediate Data is attached, it's OK to return now.
1077 */
1078 if (!cmd->immediate_data) {
1079 if (send_check_condition)
1080 return 0;
1081
1082 if (cmd->unsolicited_data) {
1083 iscsit_set_dataout_sequence_values(cmd);
1084
1085 spin_lock_bh(&cmd->dataout_timeout_lock);
1086 iscsit_start_dataout_timer(cmd, cmd->conn);
1087 spin_unlock_bh(&cmd->dataout_timeout_lock);
1088 }
1089
1090 return 0;
1091 }
1092
1093 /*
1094 * Early CHECK_CONDITIONs never make it to the transport processing
1095 * thread. They are processed in CmdSN order by
1096 * iscsit_check_received_cmdsn() below.
1097 */
1098 if (send_check_condition) {
1099 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1100 dump_immediate_data = 1;
1101 goto after_immediate_data;
1102 }
1103 /*
1104 * Call directly into transport_generic_new_cmd() to perform
1105 * the backend memory allocation.
1106 */
1107 ret = transport_generic_new_cmd(&cmd->se_cmd);
1108 if (ret < 0) {
1109 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1110 dump_immediate_data = 1;
1111 goto after_immediate_data;
1112 }
1113
1114 immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1115 after_immediate_data:
1116 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1117 /*
1118 * A PDU/CmdSN carrying Immediate Data passed
1119 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1120 * Immediate Bit is not set.
1121 */
1122 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1123 /*
1124 * Special case for Unsupported SAM WRITE Opcodes
1125 * and ImmediateData=Yes.
1126 */
1127 if (dump_immediate_data) {
1128 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1129 return -1;
1130 } else if (cmd->unsolicited_data) {
1131 iscsit_set_dataout_sequence_values(cmd);
1132
1133 spin_lock_bh(&cmd->dataout_timeout_lock);
1134 iscsit_start_dataout_timer(cmd, cmd->conn);
1135 spin_unlock_bh(&cmd->dataout_timeout_lock);
1136 }
1137
1138 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1139 return iscsit_add_reject_from_cmd(
1140 ISCSI_REASON_PROTOCOL_ERROR,
1141 1, 0, buf, cmd);
1142
1143 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1144 /*
1145 * Immediate Data failed DataCRC and ERL>=1,
1146 * silently drop this PDU and let the initiator
1147 * plug the CmdSN gap.
1148 *
1149 * FIXME: Send Unsolicited NOPIN with reserved
1150 * TTT here to help the initiator figure out
1151 * the missing CmdSN, although they should be
1152 * intelligent enough to determine the missing
1153 * CmdSN and issue a retry to plug the sequence.
1154 */
1155 cmd->i_state = ISTATE_REMOVE;
1156 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1157 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1158 return -1;
1159
1160 return 0;
1161 }
1162
iscsit_do_crypto_hash_sg(struct hash_desc * hash,struct iscsi_cmd * cmd,u32 data_offset,u32 data_length,u32 padding,u8 * pad_bytes)1163 static u32 iscsit_do_crypto_hash_sg(
1164 struct hash_desc *hash,
1165 struct iscsi_cmd *cmd,
1166 u32 data_offset,
1167 u32 data_length,
1168 u32 padding,
1169 u8 *pad_bytes)
1170 {
1171 u32 data_crc;
1172 u32 i;
1173 struct scatterlist *sg;
1174 unsigned int page_off;
1175
1176 crypto_hash_init(hash);
1177
1178 sg = cmd->first_data_sg;
1179 page_off = cmd->first_data_sg_off;
1180
1181 i = 0;
1182 while (data_length) {
1183 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1184
1185 crypto_hash_update(hash, &sg[i], cur_len);
1186
1187 data_length -= cur_len;
1188 page_off = 0;
1189 i++;
1190 }
1191
1192 if (padding) {
1193 struct scatterlist pad_sg;
1194
1195 sg_init_one(&pad_sg, pad_bytes, padding);
1196 crypto_hash_update(hash, &pad_sg, padding);
1197 }
1198 crypto_hash_final(hash, (u8 *) &data_crc);
1199
1200 return data_crc;
1201 }
1202
iscsit_do_crypto_hash_buf(struct hash_desc * hash,unsigned char * buf,u32 payload_length,u32 padding,u8 * pad_bytes,u8 * data_crc)1203 static void iscsit_do_crypto_hash_buf(
1204 struct hash_desc *hash,
1205 unsigned char *buf,
1206 u32 payload_length,
1207 u32 padding,
1208 u8 *pad_bytes,
1209 u8 *data_crc)
1210 {
1211 struct scatterlist sg;
1212
1213 crypto_hash_init(hash);
1214
1215 sg_init_one(&sg, buf, payload_length);
1216 crypto_hash_update(hash, &sg, payload_length);
1217
1218 if (padding) {
1219 sg_init_one(&sg, pad_bytes, padding);
1220 crypto_hash_update(hash, &sg, padding);
1221 }
1222 crypto_hash_final(hash, data_crc);
1223 }
1224
iscsit_handle_data_out(struct iscsi_conn * conn,unsigned char * buf)1225 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1226 {
1227 int iov_ret, ooo_cmdsn = 0, ret;
1228 u8 data_crc_failed = 0;
1229 u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1230 u32 rx_size = 0, payload_length;
1231 struct iscsi_cmd *cmd = NULL;
1232 struct se_cmd *se_cmd;
1233 struct iscsi_data *hdr;
1234 struct kvec *iov;
1235 unsigned long flags;
1236
1237 hdr = (struct iscsi_data *) buf;
1238 payload_length = ntoh24(hdr->dlength);
1239 hdr->itt = be32_to_cpu(hdr->itt);
1240 hdr->ttt = be32_to_cpu(hdr->ttt);
1241 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1242 hdr->datasn = be32_to_cpu(hdr->datasn);
1243 hdr->offset = be32_to_cpu(hdr->offset);
1244
1245 if (!payload_length) {
1246 pr_err("DataOUT payload is ZERO, protocol error.\n");
1247 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1248 buf, conn);
1249 }
1250
1251 /* iSCSI write */
1252 spin_lock_bh(&conn->sess->session_stats_lock);
1253 conn->sess->rx_data_octets += payload_length;
1254 if (conn->sess->se_sess->se_node_acl) {
1255 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1256 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1257 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1258 }
1259 spin_unlock_bh(&conn->sess->session_stats_lock);
1260
1261 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1262 pr_err("DataSegmentLength: %u is greater than"
1263 " MaxRecvDataSegmentLength: %u\n", payload_length,
1264 conn->conn_ops->MaxRecvDataSegmentLength);
1265 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1266 buf, conn);
1267 }
1268
1269 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1270 payload_length);
1271 if (!cmd)
1272 return 0;
1273
1274 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1275 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1276 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1277 payload_length, conn->cid);
1278
1279 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1280 pr_err("Command ITT: 0x%08x received DataOUT after"
1281 " last DataOUT received, dumping payload\n",
1282 cmd->init_task_tag);
1283 return iscsit_dump_data_payload(conn, payload_length, 1);
1284 }
1285
1286 if (cmd->data_direction != DMA_TO_DEVICE) {
1287 pr_err("Command ITT: 0x%08x received DataOUT for a"
1288 " NON-WRITE command.\n", cmd->init_task_tag);
1289 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1290 1, 0, buf, cmd);
1291 }
1292 se_cmd = &cmd->se_cmd;
1293 iscsit_mod_dataout_timer(cmd);
1294
1295 if ((hdr->offset + payload_length) > cmd->data_length) {
1296 pr_err("DataOut Offset: %u, Length %u greater than"
1297 " iSCSI Command EDTL %u, protocol error.\n",
1298 hdr->offset, payload_length, cmd->data_length);
1299 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1300 1, 0, buf, cmd);
1301 }
1302
1303 if (cmd->unsolicited_data) {
1304 int dump_unsolicited_data = 0;
1305
1306 if (conn->sess->sess_ops->InitialR2T) {
1307 pr_err("Received unexpected unsolicited data"
1308 " while InitialR2T=Yes, protocol error.\n");
1309 transport_send_check_condition_and_sense(&cmd->se_cmd,
1310 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1311 return -1;
1312 }
1313 /*
1314 * Special case for dealing with Unsolicited DataOUT
1315 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1316 * failures;
1317 */
1318
1319 /* Something's amiss if we're not in WRITE_PENDING state... */
1320 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1321 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1322 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1323
1324 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1325 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1326 (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION))
1327 dump_unsolicited_data = 1;
1328 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1329
1330 if (dump_unsolicited_data) {
1331 /*
1332 * Check if a delayed TASK_ABORTED status needs to
1333 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1334 * received with the unsolicitied data out.
1335 */
1336 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1337 iscsit_stop_dataout_timer(cmd);
1338
1339 transport_check_aborted_status(se_cmd,
1340 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1341 return iscsit_dump_data_payload(conn, payload_length, 1);
1342 }
1343 } else {
1344 /*
1345 * For the normal solicited data path:
1346 *
1347 * Check for a delayed TASK_ABORTED status and dump any
1348 * incoming data out payload if one exists. Also, when the
1349 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1350 * data out sequence, we decrement outstanding_r2ts. Once
1351 * outstanding_r2ts reaches zero, go ahead and send the delayed
1352 * TASK_ABORTED status.
1353 */
1354 if (se_cmd->transport_state & CMD_T_ABORTED) {
1355 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1356 if (--cmd->outstanding_r2ts < 1) {
1357 iscsit_stop_dataout_timer(cmd);
1358 transport_check_aborted_status(
1359 se_cmd, 1);
1360 }
1361
1362 return iscsit_dump_data_payload(conn, payload_length, 1);
1363 }
1364 }
1365 /*
1366 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1367 * within-command recovery checks before receiving the payload.
1368 */
1369 ret = iscsit_check_pre_dataout(cmd, buf);
1370 if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1371 return 0;
1372 else if (ret == DATAOUT_CANNOT_RECOVER)
1373 return -1;
1374
1375 rx_size += payload_length;
1376 iov = &cmd->iov_data[0];
1377
1378 iov_ret = iscsit_map_iovec(cmd, iov, hdr->offset, payload_length);
1379 if (iov_ret < 0)
1380 return -1;
1381
1382 iov_count += iov_ret;
1383
1384 padding = ((-payload_length) & 3);
1385 if (padding != 0) {
1386 iov[iov_count].iov_base = cmd->pad_bytes;
1387 iov[iov_count++].iov_len = padding;
1388 rx_size += padding;
1389 pr_debug("Receiving %u padding bytes.\n", padding);
1390 }
1391
1392 if (conn->conn_ops->DataDigest) {
1393 iov[iov_count].iov_base = &checksum;
1394 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1395 rx_size += ISCSI_CRC_LEN;
1396 }
1397
1398 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1399
1400 iscsit_unmap_iovec(cmd);
1401
1402 if (rx_got != rx_size)
1403 return -1;
1404
1405 if (conn->conn_ops->DataDigest) {
1406 u32 data_crc;
1407
1408 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1409 hdr->offset, payload_length, padding,
1410 cmd->pad_bytes);
1411
1412 if (checksum != data_crc) {
1413 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1414 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1415 " does not match computed 0x%08x\n",
1416 hdr->itt, hdr->offset, payload_length,
1417 hdr->datasn, checksum, data_crc);
1418 data_crc_failed = 1;
1419 } else {
1420 pr_debug("Got CRC32C DataDigest 0x%08x for"
1421 " %u bytes of Data Out\n", checksum,
1422 payload_length);
1423 }
1424 }
1425 /*
1426 * Increment post receive data and CRC values or perform
1427 * within-command recovery.
1428 */
1429 ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1430 if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1431 return 0;
1432 else if (ret == DATAOUT_SEND_R2T) {
1433 iscsit_set_dataout_sequence_values(cmd);
1434 iscsit_build_r2ts_for_cmd(cmd, conn, 0);
1435 } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1436 /*
1437 * Handle extra special case for out of order
1438 * Unsolicited Data Out.
1439 */
1440 spin_lock_bh(&cmd->istate_lock);
1441 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1442 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1443 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1444 spin_unlock_bh(&cmd->istate_lock);
1445
1446 iscsit_stop_dataout_timer(cmd);
1447 return (!ooo_cmdsn) ? transport_generic_handle_data(
1448 &cmd->se_cmd) : 0;
1449 } else /* DATAOUT_CANNOT_RECOVER */
1450 return -1;
1451
1452 return 0;
1453 }
1454
iscsit_handle_nop_out(struct iscsi_conn * conn,unsigned char * buf)1455 static int iscsit_handle_nop_out(
1456 struct iscsi_conn *conn,
1457 unsigned char *buf)
1458 {
1459 unsigned char *ping_data = NULL;
1460 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1461 u32 checksum, data_crc, padding = 0, payload_length;
1462 struct iscsi_cmd *cmd = NULL;
1463 struct kvec *iov = NULL;
1464 struct iscsi_nopout *hdr;
1465
1466 hdr = (struct iscsi_nopout *) buf;
1467 payload_length = ntoh24(hdr->dlength);
1468 hdr->itt = be32_to_cpu(hdr->itt);
1469 hdr->ttt = be32_to_cpu(hdr->ttt);
1470 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1471 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1472
1473 if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1474 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1475 " not set, protocol error.\n");
1476 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1477 buf, conn);
1478 }
1479
1480 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1481 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1482 " greater than MaxRecvDataSegmentLength: %u, protocol"
1483 " error.\n", payload_length,
1484 conn->conn_ops->MaxRecvDataSegmentLength);
1485 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1486 buf, conn);
1487 }
1488
1489 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1490 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1491 (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
1492 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1493 payload_length);
1494 /*
1495 * This is not a response to a Unsolicited NopIN, which means
1496 * it can either be a NOPOUT ping request (with a valid ITT),
1497 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1498 * Either way, make sure we allocate an struct iscsi_cmd, as both
1499 * can contain ping data.
1500 */
1501 if (hdr->ttt == 0xFFFFFFFF) {
1502 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1503 if (!cmd)
1504 return iscsit_add_reject(
1505 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1506 1, buf, conn);
1507
1508 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1509 cmd->i_state = ISTATE_SEND_NOPIN;
1510 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1511 1 : 0);
1512 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1513 cmd->targ_xfer_tag = 0xFFFFFFFF;
1514 cmd->cmd_sn = hdr->cmdsn;
1515 cmd->exp_stat_sn = hdr->exp_statsn;
1516 cmd->data_direction = DMA_NONE;
1517 }
1518
1519 if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
1520 rx_size = payload_length;
1521 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1522 if (!ping_data) {
1523 pr_err("Unable to allocate memory for"
1524 " NOPOUT ping data.\n");
1525 ret = -1;
1526 goto out;
1527 }
1528
1529 iov = &cmd->iov_misc[0];
1530 iov[niov].iov_base = ping_data;
1531 iov[niov++].iov_len = payload_length;
1532
1533 padding = ((-payload_length) & 3);
1534 if (padding != 0) {
1535 pr_debug("Receiving %u additional bytes"
1536 " for padding.\n", padding);
1537 iov[niov].iov_base = &cmd->pad_bytes;
1538 iov[niov++].iov_len = padding;
1539 rx_size += padding;
1540 }
1541 if (conn->conn_ops->DataDigest) {
1542 iov[niov].iov_base = &checksum;
1543 iov[niov++].iov_len = ISCSI_CRC_LEN;
1544 rx_size += ISCSI_CRC_LEN;
1545 }
1546
1547 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1548 if (rx_got != rx_size) {
1549 ret = -1;
1550 goto out;
1551 }
1552
1553 if (conn->conn_ops->DataDigest) {
1554 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1555 ping_data, payload_length,
1556 padding, cmd->pad_bytes,
1557 (u8 *)&data_crc);
1558
1559 if (checksum != data_crc) {
1560 pr_err("Ping data CRC32C DataDigest"
1561 " 0x%08x does not match computed 0x%08x\n",
1562 checksum, data_crc);
1563 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1564 pr_err("Unable to recover from"
1565 " NOPOUT Ping DataCRC failure while in"
1566 " ERL=0.\n");
1567 ret = -1;
1568 goto out;
1569 } else {
1570 /*
1571 * Silently drop this PDU and let the
1572 * initiator plug the CmdSN gap.
1573 */
1574 pr_debug("Dropping NOPOUT"
1575 " Command CmdSN: 0x%08x due to"
1576 " DataCRC error.\n", hdr->cmdsn);
1577 ret = 0;
1578 goto out;
1579 }
1580 } else {
1581 pr_debug("Got CRC32C DataDigest"
1582 " 0x%08x for %u bytes of ping data.\n",
1583 checksum, payload_length);
1584 }
1585 }
1586
1587 ping_data[payload_length] = '\0';
1588 /*
1589 * Attach ping data to struct iscsi_cmd->buf_ptr.
1590 */
1591 cmd->buf_ptr = ping_data;
1592 cmd->buf_ptr_size = payload_length;
1593
1594 pr_debug("Got %u bytes of NOPOUT ping"
1595 " data.\n", payload_length);
1596 pr_debug("Ping Data: \"%s\"\n", ping_data);
1597 }
1598
1599 if (hdr->itt != 0xFFFFFFFF) {
1600 if (!cmd) {
1601 pr_err("Checking CmdSN for NOPOUT,"
1602 " but cmd is NULL!\n");
1603 return -1;
1604 }
1605 /*
1606 * Initiator is expecting a NopIN ping reply,
1607 */
1608 spin_lock_bh(&conn->cmd_lock);
1609 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1610 spin_unlock_bh(&conn->cmd_lock);
1611
1612 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1613
1614 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1615 iscsit_add_cmd_to_response_queue(cmd, conn,
1616 cmd->i_state);
1617 return 0;
1618 }
1619
1620 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1621 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1622 ret = 0;
1623 goto ping_out;
1624 }
1625 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1626 return iscsit_add_reject_from_cmd(
1627 ISCSI_REASON_PROTOCOL_ERROR,
1628 1, 0, buf, cmd);
1629
1630 return 0;
1631 }
1632
1633 if (hdr->ttt != 0xFFFFFFFF) {
1634 /*
1635 * This was a response to a unsolicited NOPIN ping.
1636 */
1637 cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
1638 if (!cmd)
1639 return -1;
1640
1641 iscsit_stop_nopin_response_timer(conn);
1642
1643 cmd->i_state = ISTATE_REMOVE;
1644 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1645 iscsit_start_nopin_timer(conn);
1646 } else {
1647 /*
1648 * Initiator is not expecting a NOPIN is response.
1649 * Just ignore for now.
1650 *
1651 * iSCSI v19-91 10.18
1652 * "A NOP-OUT may also be used to confirm a changed
1653 * ExpStatSN if another PDU will not be available
1654 * for a long time."
1655 */
1656 ret = 0;
1657 goto out;
1658 }
1659
1660 return 0;
1661 out:
1662 if (cmd)
1663 iscsit_release_cmd(cmd);
1664 ping_out:
1665 kfree(ping_data);
1666 return ret;
1667 }
1668
iscsit_handle_task_mgt_cmd(struct iscsi_conn * conn,unsigned char * buf)1669 static int iscsit_handle_task_mgt_cmd(
1670 struct iscsi_conn *conn,
1671 unsigned char *buf)
1672 {
1673 struct iscsi_cmd *cmd;
1674 struct se_tmr_req *se_tmr;
1675 struct iscsi_tmr_req *tmr_req;
1676 struct iscsi_tm *hdr;
1677 int out_of_order_cmdsn = 0;
1678 int ret;
1679 u8 function;
1680
1681 hdr = (struct iscsi_tm *) buf;
1682 hdr->itt = be32_to_cpu(hdr->itt);
1683 hdr->rtt = be32_to_cpu(hdr->rtt);
1684 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1685 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1686 hdr->refcmdsn = be32_to_cpu(hdr->refcmdsn);
1687 hdr->exp_datasn = be32_to_cpu(hdr->exp_datasn);
1688 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1689 function = hdr->flags;
1690
1691 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1692 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1693 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1694 hdr->rtt, hdr->refcmdsn, conn->cid);
1695
1696 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1697 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1698 (hdr->rtt != ISCSI_RESERVED_TAG))) {
1699 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1700 hdr->rtt = ISCSI_RESERVED_TAG;
1701 }
1702
1703 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1704 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1705 pr_err("Task Management Request TASK_REASSIGN not"
1706 " issued as immediate command, bad iSCSI Initiator"
1707 "implementation\n");
1708 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1709 buf, conn);
1710 }
1711 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1712 (hdr->refcmdsn != ISCSI_RESERVED_TAG))
1713 hdr->refcmdsn = ISCSI_RESERVED_TAG;
1714
1715 cmd = iscsit_allocate_se_cmd_for_tmr(conn, function);
1716 if (!cmd)
1717 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1718 1, buf, conn);
1719
1720 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1721 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1722 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1723 cmd->init_task_tag = hdr->itt;
1724 cmd->targ_xfer_tag = 0xFFFFFFFF;
1725 cmd->cmd_sn = hdr->cmdsn;
1726 cmd->exp_stat_sn = hdr->exp_statsn;
1727 se_tmr = cmd->se_cmd.se_tmr_req;
1728 tmr_req = cmd->tmr_req;
1729 /*
1730 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1731 */
1732 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1733 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1734 scsilun_to_int(&hdr->lun));
1735 if (ret < 0) {
1736 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1737 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1738 goto attach;
1739 }
1740 }
1741
1742 switch (function) {
1743 case ISCSI_TM_FUNC_ABORT_TASK:
1744 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1745 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1746 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1747 goto attach;
1748 }
1749 break;
1750 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1751 case ISCSI_TM_FUNC_CLEAR_ACA:
1752 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1753 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1754 break;
1755 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1756 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1757 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1758 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1759 goto attach;
1760 }
1761 break;
1762 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1763 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1764 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1765 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1766 goto attach;
1767 }
1768 break;
1769 case ISCSI_TM_FUNC_TASK_REASSIGN:
1770 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1771 /*
1772 * Perform sanity checks on the ExpDataSN only if the
1773 * TASK_REASSIGN was successful.
1774 */
1775 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1776 break;
1777
1778 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1779 return iscsit_add_reject_from_cmd(
1780 ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1781 buf, cmd);
1782 break;
1783 default:
1784 pr_err("Unknown TMR function: 0x%02x, protocol"
1785 " error.\n", function);
1786 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1787 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1788 goto attach;
1789 }
1790
1791 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1792 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1793 se_tmr->call_transport = 1;
1794 attach:
1795 spin_lock_bh(&conn->cmd_lock);
1796 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1797 spin_unlock_bh(&conn->cmd_lock);
1798
1799 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1800 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1801 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1802 out_of_order_cmdsn = 1;
1803 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1804 return 0;
1805 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1806 return iscsit_add_reject_from_cmd(
1807 ISCSI_REASON_PROTOCOL_ERROR,
1808 1, 0, buf, cmd);
1809 }
1810 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1811
1812 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1813 return 0;
1814 /*
1815 * Found the referenced task, send to transport for processing.
1816 */
1817 if (se_tmr->call_transport)
1818 return transport_generic_handle_tmr(&cmd->se_cmd);
1819
1820 /*
1821 * Could not find the referenced LUN, task, or Task Management
1822 * command not authorized or supported. Change state and
1823 * let the tx_thread send the response.
1824 *
1825 * For connection recovery, this is also the default action for
1826 * TMR TASK_REASSIGN.
1827 */
1828 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1829 return 0;
1830 }
1831
1832 /* #warning FIXME: Support Text Command parameters besides SendTargets */
iscsit_handle_text_cmd(struct iscsi_conn * conn,unsigned char * buf)1833 static int iscsit_handle_text_cmd(
1834 struct iscsi_conn *conn,
1835 unsigned char *buf)
1836 {
1837 char *text_ptr, *text_in;
1838 int cmdsn_ret, niov = 0, rx_got, rx_size;
1839 u32 checksum = 0, data_crc = 0, payload_length;
1840 u32 padding = 0, pad_bytes = 0, text_length = 0;
1841 struct iscsi_cmd *cmd;
1842 struct kvec iov[3];
1843 struct iscsi_text *hdr;
1844
1845 hdr = (struct iscsi_text *) buf;
1846 payload_length = ntoh24(hdr->dlength);
1847 hdr->itt = be32_to_cpu(hdr->itt);
1848 hdr->ttt = be32_to_cpu(hdr->ttt);
1849 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
1850 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
1851
1852 if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1853 pr_err("Unable to accept text parameter length: %u"
1854 "greater than MaxRecvDataSegmentLength %u.\n",
1855 payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
1856 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1857 buf, conn);
1858 }
1859
1860 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1861 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1862 hdr->exp_statsn, payload_length);
1863
1864 rx_size = text_length = payload_length;
1865 if (text_length) {
1866 text_in = kzalloc(text_length, GFP_KERNEL);
1867 if (!text_in) {
1868 pr_err("Unable to allocate memory for"
1869 " incoming text parameters\n");
1870 return -1;
1871 }
1872
1873 memset(iov, 0, 3 * sizeof(struct kvec));
1874 iov[niov].iov_base = text_in;
1875 iov[niov++].iov_len = text_length;
1876
1877 padding = ((-payload_length) & 3);
1878 if (padding != 0) {
1879 iov[niov].iov_base = &pad_bytes;
1880 iov[niov++].iov_len = padding;
1881 rx_size += padding;
1882 pr_debug("Receiving %u additional bytes"
1883 " for padding.\n", padding);
1884 }
1885 if (conn->conn_ops->DataDigest) {
1886 iov[niov].iov_base = &checksum;
1887 iov[niov++].iov_len = ISCSI_CRC_LEN;
1888 rx_size += ISCSI_CRC_LEN;
1889 }
1890
1891 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1892 if (rx_got != rx_size) {
1893 kfree(text_in);
1894 return -1;
1895 }
1896
1897 if (conn->conn_ops->DataDigest) {
1898 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1899 text_in, text_length,
1900 padding, (u8 *)&pad_bytes,
1901 (u8 *)&data_crc);
1902
1903 if (checksum != data_crc) {
1904 pr_err("Text data CRC32C DataDigest"
1905 " 0x%08x does not match computed"
1906 " 0x%08x\n", checksum, data_crc);
1907 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1908 pr_err("Unable to recover from"
1909 " Text Data digest failure while in"
1910 " ERL=0.\n");
1911 kfree(text_in);
1912 return -1;
1913 } else {
1914 /*
1915 * Silently drop this PDU and let the
1916 * initiator plug the CmdSN gap.
1917 */
1918 pr_debug("Dropping Text"
1919 " Command CmdSN: 0x%08x due to"
1920 " DataCRC error.\n", hdr->cmdsn);
1921 kfree(text_in);
1922 return 0;
1923 }
1924 } else {
1925 pr_debug("Got CRC32C DataDigest"
1926 " 0x%08x for %u bytes of text data.\n",
1927 checksum, text_length);
1928 }
1929 }
1930 text_in[text_length - 1] = '\0';
1931 pr_debug("Successfully read %d bytes of text"
1932 " data.\n", text_length);
1933
1934 if (strncmp("SendTargets", text_in, 11) != 0) {
1935 pr_err("Received Text Data that is not"
1936 " SendTargets, cannot continue.\n");
1937 kfree(text_in);
1938 return -1;
1939 }
1940 text_ptr = strchr(text_in, '=');
1941 if (!text_ptr) {
1942 pr_err("No \"=\" separator found in Text Data,"
1943 " cannot continue.\n");
1944 kfree(text_in);
1945 return -1;
1946 }
1947 if (strncmp("=All", text_ptr, 4) != 0) {
1948 pr_err("Unable to locate All value for"
1949 " SendTargets key, cannot continue.\n");
1950 kfree(text_in);
1951 return -1;
1952 }
1953 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1954 kfree(text_in);
1955 }
1956
1957 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1958 if (!cmd)
1959 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1960 1, buf, conn);
1961
1962 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1963 cmd->i_state = ISTATE_SEND_TEXTRSP;
1964 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1965 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1966 cmd->targ_xfer_tag = 0xFFFFFFFF;
1967 cmd->cmd_sn = hdr->cmdsn;
1968 cmd->exp_stat_sn = hdr->exp_statsn;
1969 cmd->data_direction = DMA_NONE;
1970
1971 spin_lock_bh(&conn->cmd_lock);
1972 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1973 spin_unlock_bh(&conn->cmd_lock);
1974
1975 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1976
1977 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1978 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1979 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1980 return iscsit_add_reject_from_cmd(
1981 ISCSI_REASON_PROTOCOL_ERROR,
1982 1, 0, buf, cmd);
1983
1984 return 0;
1985 }
1986
1987 return iscsit_execute_cmd(cmd, 0);
1988 }
1989
iscsit_logout_closesession(struct iscsi_cmd * cmd,struct iscsi_conn * conn)1990 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1991 {
1992 struct iscsi_conn *conn_p;
1993 struct iscsi_session *sess = conn->sess;
1994
1995 pr_debug("Received logout request CLOSESESSION on CID: %hu"
1996 " for SID: %u.\n", conn->cid, conn->sess->sid);
1997
1998 atomic_set(&sess->session_logout, 1);
1999 atomic_set(&conn->conn_logout_remove, 1);
2000 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2001
2002 iscsit_inc_conn_usage_count(conn);
2003 iscsit_inc_session_usage_count(sess);
2004
2005 spin_lock_bh(&sess->conn_lock);
2006 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2007 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2008 continue;
2009
2010 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2011 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2012 }
2013 spin_unlock_bh(&sess->conn_lock);
2014
2015 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2016
2017 return 0;
2018 }
2019
iscsit_logout_closeconnection(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2020 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2021 {
2022 struct iscsi_conn *l_conn;
2023 struct iscsi_session *sess = conn->sess;
2024
2025 pr_debug("Received logout request CLOSECONNECTION for CID:"
2026 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2027
2028 /*
2029 * A Logout Request with a CLOSECONNECTION reason code for a CID
2030 * can arrive on a connection with a differing CID.
2031 */
2032 if (conn->cid == cmd->logout_cid) {
2033 spin_lock_bh(&conn->state_lock);
2034 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2035 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2036
2037 atomic_set(&conn->conn_logout_remove, 1);
2038 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2039 iscsit_inc_conn_usage_count(conn);
2040
2041 spin_unlock_bh(&conn->state_lock);
2042 } else {
2043 /*
2044 * Handle all different cid CLOSECONNECTION requests in
2045 * iscsit_logout_post_handler_diffcid() as to give enough
2046 * time for any non immediate command's CmdSN to be
2047 * acknowledged on the connection in question.
2048 *
2049 * Here we simply make sure the CID is still around.
2050 */
2051 l_conn = iscsit_get_conn_from_cid(sess,
2052 cmd->logout_cid);
2053 if (!l_conn) {
2054 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2055 iscsit_add_cmd_to_response_queue(cmd, conn,
2056 cmd->i_state);
2057 return 0;
2058 }
2059
2060 iscsit_dec_conn_usage_count(l_conn);
2061 }
2062
2063 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2064
2065 return 0;
2066 }
2067
iscsit_logout_removeconnforrecovery(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2068 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2069 {
2070 struct iscsi_session *sess = conn->sess;
2071
2072 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2073 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2074
2075 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2076 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2077 " while ERL!=2.\n");
2078 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2079 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2080 return 0;
2081 }
2082
2083 if (conn->cid == cmd->logout_cid) {
2084 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2085 " with CID: %hu on CID: %hu, implementation error.\n",
2086 cmd->logout_cid, conn->cid);
2087 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2088 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2089 return 0;
2090 }
2091
2092 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2093
2094 return 0;
2095 }
2096
iscsit_handle_logout_cmd(struct iscsi_conn * conn,unsigned char * buf)2097 static int iscsit_handle_logout_cmd(
2098 struct iscsi_conn *conn,
2099 unsigned char *buf)
2100 {
2101 int cmdsn_ret, logout_remove = 0;
2102 u8 reason_code = 0;
2103 struct iscsi_cmd *cmd;
2104 struct iscsi_logout *hdr;
2105 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2106
2107 hdr = (struct iscsi_logout *) buf;
2108 reason_code = (hdr->flags & 0x7f);
2109 hdr->itt = be32_to_cpu(hdr->itt);
2110 hdr->cid = be16_to_cpu(hdr->cid);
2111 hdr->cmdsn = be32_to_cpu(hdr->cmdsn);
2112 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2113
2114 if (tiqn) {
2115 spin_lock(&tiqn->logout_stats.lock);
2116 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2117 tiqn->logout_stats.normal_logouts++;
2118 else
2119 tiqn->logout_stats.abnormal_logouts++;
2120 spin_unlock(&tiqn->logout_stats.lock);
2121 }
2122
2123 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2124 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2125 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2126 hdr->cid, conn->cid);
2127
2128 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2129 pr_err("Received logout request on connection that"
2130 " is not in logged in state, ignoring request.\n");
2131 return 0;
2132 }
2133
2134 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2135 if (!cmd)
2136 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2137 buf, conn);
2138
2139 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2140 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2141 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2142 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2143 cmd->targ_xfer_tag = 0xFFFFFFFF;
2144 cmd->cmd_sn = hdr->cmdsn;
2145 cmd->exp_stat_sn = hdr->exp_statsn;
2146 cmd->logout_cid = hdr->cid;
2147 cmd->logout_reason = reason_code;
2148 cmd->data_direction = DMA_NONE;
2149
2150 /*
2151 * We need to sleep in these cases (by returning 1) until the Logout
2152 * Response gets sent in the tx thread.
2153 */
2154 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2155 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2156 (hdr->cid == conn->cid)))
2157 logout_remove = 1;
2158
2159 spin_lock_bh(&conn->cmd_lock);
2160 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
2161 spin_unlock_bh(&conn->cmd_lock);
2162
2163 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2164 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2165
2166 /*
2167 * Immediate commands are executed, well, immediately.
2168 * Non-Immediate Logout Commands are executed in CmdSN order.
2169 */
2170 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
2171 int ret = iscsit_execute_cmd(cmd, 0);
2172
2173 if (ret < 0)
2174 return ret;
2175 } else {
2176 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2177 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2178 logout_remove = 0;
2179 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2180 return iscsit_add_reject_from_cmd(
2181 ISCSI_REASON_PROTOCOL_ERROR,
2182 1, 0, buf, cmd);
2183 }
2184 }
2185
2186 return logout_remove;
2187 }
2188
iscsit_handle_snack(struct iscsi_conn * conn,unsigned char * buf)2189 static int iscsit_handle_snack(
2190 struct iscsi_conn *conn,
2191 unsigned char *buf)
2192 {
2193 struct iscsi_snack *hdr;
2194
2195 hdr = (struct iscsi_snack *) buf;
2196 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2197 hdr->itt = be32_to_cpu(hdr->itt);
2198 hdr->ttt = be32_to_cpu(hdr->ttt);
2199 hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2200 hdr->begrun = be32_to_cpu(hdr->begrun);
2201 hdr->runlength = be32_to_cpu(hdr->runlength);
2202
2203 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2204 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2205 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2206 hdr->begrun, hdr->runlength, conn->cid);
2207
2208 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2209 pr_err("Initiator sent SNACK request while in"
2210 " ErrorRecoveryLevel=0.\n");
2211 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2212 buf, conn);
2213 }
2214 /*
2215 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2216 * call from inside iscsi_send_recovery_datain_or_r2t().
2217 */
2218 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2219 case 0:
2220 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2221 hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
2222 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2223 return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
2224 hdr->begrun, hdr->runlength);
2225 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2226 return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
2227 hdr->runlength);
2228 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2229 /* FIXME: Support R-Data SNACK */
2230 pr_err("R-Data SNACK Not Supported.\n");
2231 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2232 buf, conn);
2233 default:
2234 pr_err("Unknown SNACK type 0x%02x, protocol"
2235 " error.\n", hdr->flags & 0x0f);
2236 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2237 buf, conn);
2238 }
2239
2240 return 0;
2241 }
2242
iscsit_rx_thread_wait_for_tcp(struct iscsi_conn * conn)2243 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2244 {
2245 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2246 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2247 wait_for_completion_interruptible_timeout(
2248 &conn->rx_half_close_comp,
2249 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2250 }
2251 }
2252
iscsit_handle_immediate_data(struct iscsi_cmd * cmd,unsigned char * buf,u32 length)2253 static int iscsit_handle_immediate_data(
2254 struct iscsi_cmd *cmd,
2255 unsigned char *buf,
2256 u32 length)
2257 {
2258 int iov_ret, rx_got = 0, rx_size = 0;
2259 u32 checksum, iov_count = 0, padding = 0;
2260 struct iscsi_conn *conn = cmd->conn;
2261 struct kvec *iov;
2262
2263 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2264 if (iov_ret < 0)
2265 return IMMEDIATE_DATA_CANNOT_RECOVER;
2266
2267 rx_size = length;
2268 iov_count = iov_ret;
2269 iov = &cmd->iov_data[0];
2270
2271 padding = ((-length) & 3);
2272 if (padding != 0) {
2273 iov[iov_count].iov_base = cmd->pad_bytes;
2274 iov[iov_count++].iov_len = padding;
2275 rx_size += padding;
2276 }
2277
2278 if (conn->conn_ops->DataDigest) {
2279 iov[iov_count].iov_base = &checksum;
2280 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2281 rx_size += ISCSI_CRC_LEN;
2282 }
2283
2284 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2285
2286 iscsit_unmap_iovec(cmd);
2287
2288 if (rx_got != rx_size) {
2289 iscsit_rx_thread_wait_for_tcp(conn);
2290 return IMMEDIATE_DATA_CANNOT_RECOVER;
2291 }
2292
2293 if (conn->conn_ops->DataDigest) {
2294 u32 data_crc;
2295
2296 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2297 cmd->write_data_done, length, padding,
2298 cmd->pad_bytes);
2299
2300 if (checksum != data_crc) {
2301 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2302 " does not match computed 0x%08x\n", checksum,
2303 data_crc);
2304
2305 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2306 pr_err("Unable to recover from"
2307 " Immediate Data digest failure while"
2308 " in ERL=0.\n");
2309 iscsit_add_reject_from_cmd(
2310 ISCSI_REASON_DATA_DIGEST_ERROR,
2311 1, 0, buf, cmd);
2312 return IMMEDIATE_DATA_CANNOT_RECOVER;
2313 } else {
2314 iscsit_add_reject_from_cmd(
2315 ISCSI_REASON_DATA_DIGEST_ERROR,
2316 0, 0, buf, cmd);
2317 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2318 }
2319 } else {
2320 pr_debug("Got CRC32C DataDigest 0x%08x for"
2321 " %u bytes of Immediate Data\n", checksum,
2322 length);
2323 }
2324 }
2325
2326 cmd->write_data_done += length;
2327
2328 if (cmd->write_data_done == cmd->data_length) {
2329 spin_lock_bh(&cmd->istate_lock);
2330 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2331 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2332 spin_unlock_bh(&cmd->istate_lock);
2333 }
2334
2335 return IMMEDIATE_DATA_NORMAL_OPERATION;
2336 }
2337
2338 /*
2339 * Called with sess->conn_lock held.
2340 */
2341 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2342 with active network interface */
iscsit_build_conn_drop_async_message(struct iscsi_conn * conn)2343 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2344 {
2345 struct iscsi_cmd *cmd;
2346 struct iscsi_conn *conn_p;
2347
2348 /*
2349 * Only send a Asynchronous Message on connections whos network
2350 * interface is still functional.
2351 */
2352 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2353 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2354 iscsit_inc_conn_usage_count(conn_p);
2355 break;
2356 }
2357 }
2358
2359 if (!conn_p)
2360 return;
2361
2362 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
2363 if (!cmd) {
2364 iscsit_dec_conn_usage_count(conn_p);
2365 return;
2366 }
2367
2368 cmd->logout_cid = conn->cid;
2369 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2370 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2371
2372 spin_lock_bh(&conn_p->cmd_lock);
2373 list_add_tail(&cmd->i_list, &conn_p->conn_cmd_list);
2374 spin_unlock_bh(&conn_p->cmd_lock);
2375
2376 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2377 iscsit_dec_conn_usage_count(conn_p);
2378 }
2379
iscsit_send_conn_drop_async_message(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2380 static int iscsit_send_conn_drop_async_message(
2381 struct iscsi_cmd *cmd,
2382 struct iscsi_conn *conn)
2383 {
2384 struct iscsi_async *hdr;
2385
2386 cmd->tx_size = ISCSI_HDR_LEN;
2387 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2388
2389 hdr = (struct iscsi_async *) cmd->pdu;
2390 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2391 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2392 cmd->init_task_tag = 0xFFFFFFFF;
2393 cmd->targ_xfer_tag = 0xFFFFFFFF;
2394 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2395 cmd->stat_sn = conn->stat_sn++;
2396 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2397 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2398 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2399 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2400 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2401 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2402 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2403
2404 if (conn->conn_ops->HeaderDigest) {
2405 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2406
2407 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2408 (unsigned char *)hdr, ISCSI_HDR_LEN,
2409 0, NULL, (u8 *)header_digest);
2410
2411 cmd->tx_size += ISCSI_CRC_LEN;
2412 pr_debug("Attaching CRC32C HeaderDigest to"
2413 " Async Message 0x%08x\n", *header_digest);
2414 }
2415
2416 cmd->iov_misc[0].iov_base = cmd->pdu;
2417 cmd->iov_misc[0].iov_len = cmd->tx_size;
2418 cmd->iov_misc_count = 1;
2419
2420 pr_debug("Sending Connection Dropped Async Message StatSN:"
2421 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2422 cmd->logout_cid, conn->cid);
2423 return 0;
2424 }
2425
iscsit_send_data_in(struct iscsi_cmd * cmd,struct iscsi_conn * conn,int * eodr)2426 static int iscsit_send_data_in(
2427 struct iscsi_cmd *cmd,
2428 struct iscsi_conn *conn,
2429 int *eodr)
2430 {
2431 int iov_ret = 0, set_statsn = 0;
2432 u32 iov_count = 0, tx_size = 0;
2433 struct iscsi_datain datain;
2434 struct iscsi_datain_req *dr;
2435 struct iscsi_data_rsp *hdr;
2436 struct kvec *iov;
2437
2438 memset(&datain, 0, sizeof(struct iscsi_datain));
2439 dr = iscsit_get_datain_values(cmd, &datain);
2440 if (!dr) {
2441 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2442 cmd->init_task_tag);
2443 return -1;
2444 }
2445
2446 /*
2447 * Be paranoid and double check the logic for now.
2448 */
2449 if ((datain.offset + datain.length) > cmd->data_length) {
2450 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2451 " datain.length: %u exceeds cmd->data_length: %u\n",
2452 cmd->init_task_tag, datain.offset, datain.length,
2453 cmd->data_length);
2454 return -1;
2455 }
2456
2457 spin_lock_bh(&conn->sess->session_stats_lock);
2458 conn->sess->tx_data_octets += datain.length;
2459 if (conn->sess->se_sess->se_node_acl) {
2460 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2461 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2462 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2463 }
2464 spin_unlock_bh(&conn->sess->session_stats_lock);
2465 /*
2466 * Special case for successfully execution w/ both DATAIN
2467 * and Sense Data.
2468 */
2469 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2470 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2471 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2472 else {
2473 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2474 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2475 iscsit_increment_maxcmdsn(cmd, conn->sess);
2476 cmd->stat_sn = conn->stat_sn++;
2477 set_statsn = 1;
2478 } else if (dr->dr_complete ==
2479 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2480 set_statsn = 1;
2481 }
2482
2483 hdr = (struct iscsi_data_rsp *) cmd->pdu;
2484 memset(hdr, 0, ISCSI_HDR_LEN);
2485 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2486 hdr->flags = datain.flags;
2487 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2488 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2489 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2490 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2491 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2492 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2493 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2494 }
2495 }
2496 hton24(hdr->dlength, datain.length);
2497 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2498 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2499 (struct scsi_lun *)&hdr->lun);
2500 else
2501 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2502
2503 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2504 hdr->ttt = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
2505 cpu_to_be32(cmd->targ_xfer_tag) :
2506 0xFFFFFFFF;
2507 hdr->statsn = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
2508 0xFFFFFFFF;
2509 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2510 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2511 hdr->datasn = cpu_to_be32(datain.data_sn);
2512 hdr->offset = cpu_to_be32(datain.offset);
2513
2514 iov = &cmd->iov_data[0];
2515 iov[iov_count].iov_base = cmd->pdu;
2516 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2517 tx_size += ISCSI_HDR_LEN;
2518
2519 if (conn->conn_ops->HeaderDigest) {
2520 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2521
2522 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2523 (unsigned char *)hdr, ISCSI_HDR_LEN,
2524 0, NULL, (u8 *)header_digest);
2525
2526 iov[0].iov_len += ISCSI_CRC_LEN;
2527 tx_size += ISCSI_CRC_LEN;
2528
2529 pr_debug("Attaching CRC32 HeaderDigest"
2530 " for DataIN PDU 0x%08x\n", *header_digest);
2531 }
2532
2533 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2534 if (iov_ret < 0)
2535 return -1;
2536
2537 iov_count += iov_ret;
2538 tx_size += datain.length;
2539
2540 cmd->padding = ((-datain.length) & 3);
2541 if (cmd->padding) {
2542 iov[iov_count].iov_base = cmd->pad_bytes;
2543 iov[iov_count++].iov_len = cmd->padding;
2544 tx_size += cmd->padding;
2545
2546 pr_debug("Attaching %u padding bytes\n",
2547 cmd->padding);
2548 }
2549 if (conn->conn_ops->DataDigest) {
2550 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2551 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2552
2553 iov[iov_count].iov_base = &cmd->data_crc;
2554 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2555 tx_size += ISCSI_CRC_LEN;
2556
2557 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2558 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2559 }
2560
2561 cmd->iov_data_count = iov_count;
2562 cmd->tx_size = tx_size;
2563
2564 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2565 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2566 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2567 ntohl(hdr->offset), datain.length, conn->cid);
2568
2569 if (dr->dr_complete) {
2570 *eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2571 2 : 1;
2572 iscsit_free_datain_req(cmd, dr);
2573 }
2574
2575 return 0;
2576 }
2577
iscsit_send_logout_response(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2578 static int iscsit_send_logout_response(
2579 struct iscsi_cmd *cmd,
2580 struct iscsi_conn *conn)
2581 {
2582 int niov = 0, tx_size;
2583 struct iscsi_conn *logout_conn = NULL;
2584 struct iscsi_conn_recovery *cr = NULL;
2585 struct iscsi_session *sess = conn->sess;
2586 struct kvec *iov;
2587 struct iscsi_logout_rsp *hdr;
2588 /*
2589 * The actual shutting down of Sessions and/or Connections
2590 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2591 * is done in scsi_logout_post_handler().
2592 */
2593 switch (cmd->logout_reason) {
2594 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2595 pr_debug("iSCSI session logout successful, setting"
2596 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2597 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2598 break;
2599 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2600 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2601 break;
2602 /*
2603 * For CLOSECONNECTION logout requests carrying
2604 * a matching logout CID -> local CID, the reference
2605 * for the local CID will have been incremented in
2606 * iscsi_logout_closeconnection().
2607 *
2608 * For CLOSECONNECTION logout requests carrying
2609 * a different CID than the connection it arrived
2610 * on, the connection responding to cmd->logout_cid
2611 * is stopped in iscsit_logout_post_handler_diffcid().
2612 */
2613
2614 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2615 " successful.\n", cmd->logout_cid, conn->cid);
2616 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2617 break;
2618 case ISCSI_LOGOUT_REASON_RECOVERY:
2619 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2620 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2621 break;
2622 /*
2623 * If the connection is still active from our point of view
2624 * force connection recovery to occur.
2625 */
2626 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2627 cmd->logout_cid);
2628 if ((logout_conn)) {
2629 iscsit_connection_reinstatement_rcfr(logout_conn);
2630 iscsit_dec_conn_usage_count(logout_conn);
2631 }
2632
2633 cr = iscsit_get_inactive_connection_recovery_entry(
2634 conn->sess, cmd->logout_cid);
2635 if (!cr) {
2636 pr_err("Unable to locate CID: %hu for"
2637 " REMOVECONNFORRECOVERY Logout Request.\n",
2638 cmd->logout_cid);
2639 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2640 break;
2641 }
2642
2643 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2644
2645 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2646 " for recovery for CID: %hu on CID: %hu successful.\n",
2647 cmd->logout_cid, conn->cid);
2648 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2649 break;
2650 default:
2651 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2652 cmd->logout_reason);
2653 return -1;
2654 }
2655
2656 tx_size = ISCSI_HDR_LEN;
2657 hdr = (struct iscsi_logout_rsp *)cmd->pdu;
2658 memset(hdr, 0, ISCSI_HDR_LEN);
2659 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2660 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2661 hdr->response = cmd->logout_response;
2662 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2663 cmd->stat_sn = conn->stat_sn++;
2664 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2665
2666 iscsit_increment_maxcmdsn(cmd, conn->sess);
2667 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2668 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2669
2670 iov = &cmd->iov_misc[0];
2671 iov[niov].iov_base = cmd->pdu;
2672 iov[niov++].iov_len = ISCSI_HDR_LEN;
2673
2674 if (conn->conn_ops->HeaderDigest) {
2675 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2676
2677 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2678 (unsigned char *)hdr, ISCSI_HDR_LEN,
2679 0, NULL, (u8 *)header_digest);
2680
2681 iov[0].iov_len += ISCSI_CRC_LEN;
2682 tx_size += ISCSI_CRC_LEN;
2683 pr_debug("Attaching CRC32C HeaderDigest to"
2684 " Logout Response 0x%08x\n", *header_digest);
2685 }
2686 cmd->iov_misc_count = niov;
2687 cmd->tx_size = tx_size;
2688
2689 pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2690 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2691 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2692 cmd->logout_cid, conn->cid);
2693
2694 return 0;
2695 }
2696
2697 /*
2698 * Unsolicited NOPIN, either requesting a response or not.
2699 */
iscsit_send_unsolicited_nopin(struct iscsi_cmd * cmd,struct iscsi_conn * conn,int want_response)2700 static int iscsit_send_unsolicited_nopin(
2701 struct iscsi_cmd *cmd,
2702 struct iscsi_conn *conn,
2703 int want_response)
2704 {
2705 int tx_size = ISCSI_HDR_LEN;
2706 struct iscsi_nopin *hdr;
2707
2708 hdr = (struct iscsi_nopin *) cmd->pdu;
2709 memset(hdr, 0, ISCSI_HDR_LEN);
2710 hdr->opcode = ISCSI_OP_NOOP_IN;
2711 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2712 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2713 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2714 cmd->stat_sn = conn->stat_sn;
2715 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2716 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2717 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2718
2719 if (conn->conn_ops->HeaderDigest) {
2720 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2721
2722 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2723 (unsigned char *)hdr, ISCSI_HDR_LEN,
2724 0, NULL, (u8 *)header_digest);
2725
2726 tx_size += ISCSI_CRC_LEN;
2727 pr_debug("Attaching CRC32C HeaderDigest to"
2728 " NopIN 0x%08x\n", *header_digest);
2729 }
2730
2731 cmd->iov_misc[0].iov_base = cmd->pdu;
2732 cmd->iov_misc[0].iov_len = tx_size;
2733 cmd->iov_misc_count = 1;
2734 cmd->tx_size = tx_size;
2735
2736 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2737 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2738
2739 return 0;
2740 }
2741
iscsit_send_nopin_response(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2742 static int iscsit_send_nopin_response(
2743 struct iscsi_cmd *cmd,
2744 struct iscsi_conn *conn)
2745 {
2746 int niov = 0, tx_size;
2747 u32 padding = 0;
2748 struct kvec *iov;
2749 struct iscsi_nopin *hdr;
2750
2751 tx_size = ISCSI_HDR_LEN;
2752 hdr = (struct iscsi_nopin *) cmd->pdu;
2753 memset(hdr, 0, ISCSI_HDR_LEN);
2754 hdr->opcode = ISCSI_OP_NOOP_IN;
2755 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2756 hton24(hdr->dlength, cmd->buf_ptr_size);
2757 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2758 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2759 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2760 cmd->stat_sn = conn->stat_sn++;
2761 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2762
2763 iscsit_increment_maxcmdsn(cmd, conn->sess);
2764 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2765 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2766
2767 iov = &cmd->iov_misc[0];
2768 iov[niov].iov_base = cmd->pdu;
2769 iov[niov++].iov_len = ISCSI_HDR_LEN;
2770
2771 if (conn->conn_ops->HeaderDigest) {
2772 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2773
2774 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2775 (unsigned char *)hdr, ISCSI_HDR_LEN,
2776 0, NULL, (u8 *)header_digest);
2777
2778 iov[0].iov_len += ISCSI_CRC_LEN;
2779 tx_size += ISCSI_CRC_LEN;
2780 pr_debug("Attaching CRC32C HeaderDigest"
2781 " to NopIn 0x%08x\n", *header_digest);
2782 }
2783
2784 /*
2785 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2786 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2787 */
2788 if (cmd->buf_ptr_size) {
2789 iov[niov].iov_base = cmd->buf_ptr;
2790 iov[niov++].iov_len = cmd->buf_ptr_size;
2791 tx_size += cmd->buf_ptr_size;
2792
2793 pr_debug("Echoing back %u bytes of ping"
2794 " data.\n", cmd->buf_ptr_size);
2795
2796 padding = ((-cmd->buf_ptr_size) & 3);
2797 if (padding != 0) {
2798 iov[niov].iov_base = &cmd->pad_bytes;
2799 iov[niov++].iov_len = padding;
2800 tx_size += padding;
2801 pr_debug("Attaching %u additional"
2802 " padding bytes.\n", padding);
2803 }
2804 if (conn->conn_ops->DataDigest) {
2805 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2806 cmd->buf_ptr, cmd->buf_ptr_size,
2807 padding, (u8 *)&cmd->pad_bytes,
2808 (u8 *)&cmd->data_crc);
2809
2810 iov[niov].iov_base = &cmd->data_crc;
2811 iov[niov++].iov_len = ISCSI_CRC_LEN;
2812 tx_size += ISCSI_CRC_LEN;
2813 pr_debug("Attached DataDigest for %u"
2814 " bytes of ping data, CRC 0x%08x\n",
2815 cmd->buf_ptr_size, cmd->data_crc);
2816 }
2817 }
2818
2819 cmd->iov_misc_count = niov;
2820 cmd->tx_size = tx_size;
2821
2822 pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2823 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2824 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2825
2826 return 0;
2827 }
2828
iscsit_send_r2t(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2829 int iscsit_send_r2t(
2830 struct iscsi_cmd *cmd,
2831 struct iscsi_conn *conn)
2832 {
2833 int tx_size = 0;
2834 struct iscsi_r2t *r2t;
2835 struct iscsi_r2t_rsp *hdr;
2836
2837 r2t = iscsit_get_r2t_from_list(cmd);
2838 if (!r2t)
2839 return -1;
2840
2841 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
2842 memset(hdr, 0, ISCSI_HDR_LEN);
2843 hdr->opcode = ISCSI_OP_R2T;
2844 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2845 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2846 (struct scsi_lun *)&hdr->lun);
2847 hdr->itt = cpu_to_be32(cmd->init_task_tag);
2848 spin_lock_bh(&conn->sess->ttt_lock);
2849 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2850 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2851 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2852 spin_unlock_bh(&conn->sess->ttt_lock);
2853 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
2854 hdr->statsn = cpu_to_be32(conn->stat_sn);
2855 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2856 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2857 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
2858 hdr->data_offset = cpu_to_be32(r2t->offset);
2859 hdr->data_length = cpu_to_be32(r2t->xfer_len);
2860
2861 cmd->iov_misc[0].iov_base = cmd->pdu;
2862 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
2863 tx_size += ISCSI_HDR_LEN;
2864
2865 if (conn->conn_ops->HeaderDigest) {
2866 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2867
2868 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2869 (unsigned char *)hdr, ISCSI_HDR_LEN,
2870 0, NULL, (u8 *)header_digest);
2871
2872 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2873 tx_size += ISCSI_CRC_LEN;
2874 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2875 " PDU 0x%08x\n", *header_digest);
2876 }
2877
2878 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2879 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2880 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2881 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2882 r2t->offset, r2t->xfer_len, conn->cid);
2883
2884 cmd->iov_misc_count = 1;
2885 cmd->tx_size = tx_size;
2886
2887 spin_lock_bh(&cmd->r2t_lock);
2888 r2t->sent_r2t = 1;
2889 spin_unlock_bh(&cmd->r2t_lock);
2890
2891 return 0;
2892 }
2893
2894 /*
2895 * type 0: Normal Operation.
2896 * type 1: Called from Storage Transport.
2897 * type 2: Called from iscsi_task_reassign_complete_write() for
2898 * connection recovery.
2899 */
iscsit_build_r2ts_for_cmd(struct iscsi_cmd * cmd,struct iscsi_conn * conn,int type)2900 int iscsit_build_r2ts_for_cmd(
2901 struct iscsi_cmd *cmd,
2902 struct iscsi_conn *conn,
2903 int type)
2904 {
2905 int first_r2t = 1;
2906 u32 offset = 0, xfer_len = 0;
2907
2908 spin_lock_bh(&cmd->r2t_lock);
2909 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2910 spin_unlock_bh(&cmd->r2t_lock);
2911 return 0;
2912 }
2913
2914 if (conn->sess->sess_ops->DataSequenceInOrder && (type != 2))
2915 if (cmd->r2t_offset < cmd->write_data_done)
2916 cmd->r2t_offset = cmd->write_data_done;
2917
2918 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2919 if (conn->sess->sess_ops->DataSequenceInOrder) {
2920 offset = cmd->r2t_offset;
2921
2922 if (first_r2t && (type == 2)) {
2923 xfer_len = ((offset +
2924 (conn->sess->sess_ops->MaxBurstLength -
2925 cmd->next_burst_len) >
2926 cmd->data_length) ?
2927 (cmd->data_length - offset) :
2928 (conn->sess->sess_ops->MaxBurstLength -
2929 cmd->next_burst_len));
2930 } else {
2931 xfer_len = ((offset +
2932 conn->sess->sess_ops->MaxBurstLength) >
2933 cmd->data_length) ?
2934 (cmd->data_length - offset) :
2935 conn->sess->sess_ops->MaxBurstLength;
2936 }
2937 cmd->r2t_offset += xfer_len;
2938
2939 if (cmd->r2t_offset == cmd->data_length)
2940 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2941 } else {
2942 struct iscsi_seq *seq;
2943
2944 seq = iscsit_get_seq_holder_for_r2t(cmd);
2945 if (!seq) {
2946 spin_unlock_bh(&cmd->r2t_lock);
2947 return -1;
2948 }
2949
2950 offset = seq->offset;
2951 xfer_len = seq->xfer_len;
2952
2953 if (cmd->seq_send_order == cmd->seq_count)
2954 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2955 }
2956 cmd->outstanding_r2ts++;
2957 first_r2t = 0;
2958
2959 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
2960 spin_unlock_bh(&cmd->r2t_lock);
2961 return -1;
2962 }
2963
2964 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
2965 break;
2966 }
2967 spin_unlock_bh(&cmd->r2t_lock);
2968
2969 return 0;
2970 }
2971
iscsit_send_status(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2972 static int iscsit_send_status(
2973 struct iscsi_cmd *cmd,
2974 struct iscsi_conn *conn)
2975 {
2976 u8 iov_count = 0, recovery;
2977 u32 padding = 0, tx_size = 0;
2978 struct iscsi_scsi_rsp *hdr;
2979 struct kvec *iov;
2980
2981 recovery = (cmd->i_state != ISTATE_SEND_STATUS);
2982 if (!recovery)
2983 cmd->stat_sn = conn->stat_sn++;
2984
2985 spin_lock_bh(&conn->sess->session_stats_lock);
2986 conn->sess->rsp_pdus++;
2987 spin_unlock_bh(&conn->sess->session_stats_lock);
2988
2989 hdr = (struct iscsi_scsi_rsp *) cmd->pdu;
2990 memset(hdr, 0, ISCSI_HDR_LEN);
2991 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
2992 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2993 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2994 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
2995 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2996 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2997 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
2998 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2999 }
3000 hdr->response = cmd->iscsi_response;
3001 hdr->cmd_status = cmd->se_cmd.scsi_status;
3002 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3003 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3004
3005 iscsit_increment_maxcmdsn(cmd, conn->sess);
3006 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3007 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3008
3009 iov = &cmd->iov_misc[0];
3010 iov[iov_count].iov_base = cmd->pdu;
3011 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3012 tx_size += ISCSI_HDR_LEN;
3013
3014 /*
3015 * Attach SENSE DATA payload to iSCSI Response PDU
3016 */
3017 if (cmd->se_cmd.sense_buffer &&
3018 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3019 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3020 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3021 hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
3022 iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
3023 iov[iov_count++].iov_len =
3024 (cmd->se_cmd.scsi_sense_length + padding);
3025 tx_size += cmd->se_cmd.scsi_sense_length;
3026
3027 if (padding) {
3028 memset(cmd->se_cmd.sense_buffer +
3029 cmd->se_cmd.scsi_sense_length, 0, padding);
3030 tx_size += padding;
3031 pr_debug("Adding %u bytes of padding to"
3032 " SENSE.\n", padding);
3033 }
3034
3035 if (conn->conn_ops->DataDigest) {
3036 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3037 cmd->se_cmd.sense_buffer,
3038 (cmd->se_cmd.scsi_sense_length + padding),
3039 0, NULL, (u8 *)&cmd->data_crc);
3040
3041 iov[iov_count].iov_base = &cmd->data_crc;
3042 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3043 tx_size += ISCSI_CRC_LEN;
3044
3045 pr_debug("Attaching CRC32 DataDigest for"
3046 " SENSE, %u bytes CRC 0x%08x\n",
3047 (cmd->se_cmd.scsi_sense_length + padding),
3048 cmd->data_crc);
3049 }
3050
3051 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3052 " Response PDU\n",
3053 cmd->se_cmd.scsi_sense_length);
3054 }
3055
3056 if (conn->conn_ops->HeaderDigest) {
3057 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3058
3059 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3060 (unsigned char *)hdr, ISCSI_HDR_LEN,
3061 0, NULL, (u8 *)header_digest);
3062
3063 iov[0].iov_len += ISCSI_CRC_LEN;
3064 tx_size += ISCSI_CRC_LEN;
3065 pr_debug("Attaching CRC32 HeaderDigest for Response"
3066 " PDU 0x%08x\n", *header_digest);
3067 }
3068
3069 cmd->iov_misc_count = iov_count;
3070 cmd->tx_size = tx_size;
3071
3072 pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3073 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3074 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3075 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3076
3077 return 0;
3078 }
3079
iscsit_convert_tcm_tmr_rsp(struct se_tmr_req * se_tmr)3080 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3081 {
3082 switch (se_tmr->response) {
3083 case TMR_FUNCTION_COMPLETE:
3084 return ISCSI_TMF_RSP_COMPLETE;
3085 case TMR_TASK_DOES_NOT_EXIST:
3086 return ISCSI_TMF_RSP_NO_TASK;
3087 case TMR_LUN_DOES_NOT_EXIST:
3088 return ISCSI_TMF_RSP_NO_LUN;
3089 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3090 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3091 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3092 return ISCSI_TMF_RSP_AUTH_FAILED;
3093 case TMR_FUNCTION_REJECTED:
3094 default:
3095 return ISCSI_TMF_RSP_REJECTED;
3096 }
3097 }
3098
iscsit_send_task_mgt_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3099 static int iscsit_send_task_mgt_rsp(
3100 struct iscsi_cmd *cmd,
3101 struct iscsi_conn *conn)
3102 {
3103 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3104 struct iscsi_tm_rsp *hdr;
3105 u32 tx_size = 0;
3106
3107 hdr = (struct iscsi_tm_rsp *) cmd->pdu;
3108 memset(hdr, 0, ISCSI_HDR_LEN);
3109 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3110 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3111 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3112 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3113 cmd->stat_sn = conn->stat_sn++;
3114 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3115
3116 iscsit_increment_maxcmdsn(cmd, conn->sess);
3117 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3118 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3119
3120 cmd->iov_misc[0].iov_base = cmd->pdu;
3121 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3122 tx_size += ISCSI_HDR_LEN;
3123
3124 if (conn->conn_ops->HeaderDigest) {
3125 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3126
3127 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3128 (unsigned char *)hdr, ISCSI_HDR_LEN,
3129 0, NULL, (u8 *)header_digest);
3130
3131 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3132 tx_size += ISCSI_CRC_LEN;
3133 pr_debug("Attaching CRC32 HeaderDigest for Task"
3134 " Mgmt Response PDU 0x%08x\n", *header_digest);
3135 }
3136
3137 cmd->iov_misc_count = 1;
3138 cmd->tx_size = tx_size;
3139
3140 pr_debug("Built Task Management Response ITT: 0x%08x,"
3141 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3142 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3143
3144 return 0;
3145 }
3146
iscsit_check_inaddr_any(struct iscsi_np * np)3147 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3148 {
3149 bool ret = false;
3150
3151 if (np->np_sockaddr.ss_family == AF_INET6) {
3152 const struct sockaddr_in6 sin6 = {
3153 .sin6_addr = IN6ADDR_ANY_INIT };
3154 struct sockaddr_in6 *sock_in6 =
3155 (struct sockaddr_in6 *)&np->np_sockaddr;
3156
3157 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3158 sin6.sin6_addr.s6_addr, 16))
3159 ret = true;
3160 } else {
3161 struct sockaddr_in * sock_in =
3162 (struct sockaddr_in *)&np->np_sockaddr;
3163
3164 if (sock_in->sin_addr.s_addr == INADDR_ANY)
3165 ret = true;
3166 }
3167
3168 return ret;
3169 }
3170
iscsit_build_sendtargets_response(struct iscsi_cmd * cmd)3171 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3172 {
3173 char *payload = NULL;
3174 struct iscsi_conn *conn = cmd->conn;
3175 struct iscsi_portal_group *tpg;
3176 struct iscsi_tiqn *tiqn;
3177 struct iscsi_tpg_np *tpg_np;
3178 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3179 unsigned char buf[256];
3180
3181 buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ?
3182 32768 : conn->conn_ops->MaxRecvDataSegmentLength;
3183
3184 memset(buf, 0, 256);
3185
3186 payload = kzalloc(buffer_len, GFP_KERNEL);
3187 if (!payload) {
3188 pr_err("Unable to allocate memory for sendtargets"
3189 " response.\n");
3190 return -ENOMEM;
3191 }
3192
3193 spin_lock(&tiqn_lock);
3194 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3195 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3196 len += 1;
3197
3198 if ((len + payload_len) > buffer_len) {
3199 end_of_buf = 1;
3200 goto eob;
3201 }
3202 memcpy(payload + payload_len, buf, len);
3203 payload_len += len;
3204
3205 spin_lock(&tiqn->tiqn_tpg_lock);
3206 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3207
3208 spin_lock(&tpg->tpg_state_lock);
3209 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3210 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3211 spin_unlock(&tpg->tpg_state_lock);
3212 continue;
3213 }
3214 spin_unlock(&tpg->tpg_state_lock);
3215
3216 spin_lock(&tpg->tpg_np_lock);
3217 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3218 tpg_np_list) {
3219 struct iscsi_np *np = tpg_np->tpg_np;
3220 bool inaddr_any = iscsit_check_inaddr_any(np);
3221
3222 len = sprintf(buf, "TargetAddress="
3223 "%s%s%s:%hu,%hu",
3224 (np->np_sockaddr.ss_family == AF_INET6) ?
3225 "[" : "", (inaddr_any == false) ?
3226 np->np_ip : conn->local_ip,
3227 (np->np_sockaddr.ss_family == AF_INET6) ?
3228 "]" : "", (inaddr_any == false) ?
3229 np->np_port : conn->local_port,
3230 tpg->tpgt);
3231 len += 1;
3232
3233 if ((len + payload_len) > buffer_len) {
3234 spin_unlock(&tpg->tpg_np_lock);
3235 spin_unlock(&tiqn->tiqn_tpg_lock);
3236 end_of_buf = 1;
3237 goto eob;
3238 }
3239 memcpy(payload + payload_len, buf, len);
3240 payload_len += len;
3241 }
3242 spin_unlock(&tpg->tpg_np_lock);
3243 }
3244 spin_unlock(&tiqn->tiqn_tpg_lock);
3245 eob:
3246 if (end_of_buf)
3247 break;
3248 }
3249 spin_unlock(&tiqn_lock);
3250
3251 cmd->buf_ptr = payload;
3252
3253 return payload_len;
3254 }
3255
3256 /*
3257 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3258 * MaxRecvDataSegmentLength.
3259 */
iscsit_send_text_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3260 static int iscsit_send_text_rsp(
3261 struct iscsi_cmd *cmd,
3262 struct iscsi_conn *conn)
3263 {
3264 struct iscsi_text_rsp *hdr;
3265 struct kvec *iov;
3266 u32 padding = 0, tx_size = 0;
3267 int text_length, iov_count = 0;
3268
3269 text_length = iscsit_build_sendtargets_response(cmd);
3270 if (text_length < 0)
3271 return text_length;
3272
3273 padding = ((-text_length) & 3);
3274 if (padding != 0) {
3275 memset(cmd->buf_ptr + text_length, 0, padding);
3276 pr_debug("Attaching %u additional bytes for"
3277 " padding.\n", padding);
3278 }
3279
3280 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3281 memset(hdr, 0, ISCSI_HDR_LEN);
3282 hdr->opcode = ISCSI_OP_TEXT_RSP;
3283 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3284 hton24(hdr->dlength, text_length);
3285 hdr->itt = cpu_to_be32(cmd->init_task_tag);
3286 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3287 cmd->stat_sn = conn->stat_sn++;
3288 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3289
3290 iscsit_increment_maxcmdsn(cmd, conn->sess);
3291 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3292 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3293
3294 iov = &cmd->iov_misc[0];
3295
3296 iov[iov_count].iov_base = cmd->pdu;
3297 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3298 iov[iov_count].iov_base = cmd->buf_ptr;
3299 iov[iov_count++].iov_len = text_length + padding;
3300
3301 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3302
3303 if (conn->conn_ops->HeaderDigest) {
3304 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3305
3306 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3307 (unsigned char *)hdr, ISCSI_HDR_LEN,
3308 0, NULL, (u8 *)header_digest);
3309
3310 iov[0].iov_len += ISCSI_CRC_LEN;
3311 tx_size += ISCSI_CRC_LEN;
3312 pr_debug("Attaching CRC32 HeaderDigest for"
3313 " Text Response PDU 0x%08x\n", *header_digest);
3314 }
3315
3316 if (conn->conn_ops->DataDigest) {
3317 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3318 cmd->buf_ptr, (text_length + padding),
3319 0, NULL, (u8 *)&cmd->data_crc);
3320
3321 iov[iov_count].iov_base = &cmd->data_crc;
3322 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3323 tx_size += ISCSI_CRC_LEN;
3324
3325 pr_debug("Attaching DataDigest for %u bytes of text"
3326 " data, CRC 0x%08x\n", (text_length + padding),
3327 cmd->data_crc);
3328 }
3329
3330 cmd->iov_misc_count = iov_count;
3331 cmd->tx_size = tx_size;
3332
3333 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3334 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3335 text_length, conn->cid);
3336 return 0;
3337 }
3338
iscsit_send_reject(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3339 static int iscsit_send_reject(
3340 struct iscsi_cmd *cmd,
3341 struct iscsi_conn *conn)
3342 {
3343 u32 iov_count = 0, tx_size = 0;
3344 struct iscsi_reject *hdr;
3345 struct kvec *iov;
3346
3347 hdr = (struct iscsi_reject *) cmd->pdu;
3348 hdr->opcode = ISCSI_OP_REJECT;
3349 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3350 hton24(hdr->dlength, ISCSI_HDR_LEN);
3351 hdr->ffffffff = 0xffffffff;
3352 cmd->stat_sn = conn->stat_sn++;
3353 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3354 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3355 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3356
3357 iov = &cmd->iov_misc[0];
3358
3359 iov[iov_count].iov_base = cmd->pdu;
3360 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3361 iov[iov_count].iov_base = cmd->buf_ptr;
3362 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3363
3364 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3365
3366 if (conn->conn_ops->HeaderDigest) {
3367 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3368
3369 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3370 (unsigned char *)hdr, ISCSI_HDR_LEN,
3371 0, NULL, (u8 *)header_digest);
3372
3373 iov[0].iov_len += ISCSI_CRC_LEN;
3374 tx_size += ISCSI_CRC_LEN;
3375 pr_debug("Attaching CRC32 HeaderDigest for"
3376 " REJECT PDU 0x%08x\n", *header_digest);
3377 }
3378
3379 if (conn->conn_ops->DataDigest) {
3380 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3381 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3382 0, NULL, (u8 *)&cmd->data_crc);
3383
3384 iov[iov_count].iov_base = &cmd->data_crc;
3385 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3386 tx_size += ISCSI_CRC_LEN;
3387 pr_debug("Attaching CRC32 DataDigest for REJECT"
3388 " PDU 0x%08x\n", cmd->data_crc);
3389 }
3390
3391 cmd->iov_misc_count = iov_count;
3392 cmd->tx_size = tx_size;
3393
3394 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3395 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3396
3397 return 0;
3398 }
3399
iscsit_tx_thread_wait_for_tcp(struct iscsi_conn * conn)3400 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
3401 {
3402 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
3403 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
3404 wait_for_completion_interruptible_timeout(
3405 &conn->tx_half_close_comp,
3406 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
3407 }
3408 }
3409
3410 #ifdef CONFIG_SMP
3411
iscsit_thread_get_cpumask(struct iscsi_conn * conn)3412 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3413 {
3414 struct iscsi_thread_set *ts = conn->thread_set;
3415 int ord, cpu;
3416 /*
3417 * thread_id is assigned from iscsit_global->ts_bitmap from
3418 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3419 *
3420 * Here we use thread_id to determine which CPU that this
3421 * iSCSI connection's iscsi_thread_set will be scheduled to
3422 * execute upon.
3423 */
3424 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3425 #if 0
3426 pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from"
3427 " thread_id: %d\n", ord, ts->thread_id);
3428 #endif
3429 for_each_online_cpu(cpu) {
3430 if (ord-- == 0) {
3431 cpumask_set_cpu(cpu, conn->conn_cpumask);
3432 return;
3433 }
3434 }
3435 /*
3436 * This should never be reached..
3437 */
3438 dump_stack();
3439 cpumask_setall(conn->conn_cpumask);
3440 }
3441
iscsit_thread_check_cpumask(struct iscsi_conn * conn,struct task_struct * p,int mode)3442 static inline void iscsit_thread_check_cpumask(
3443 struct iscsi_conn *conn,
3444 struct task_struct *p,
3445 int mode)
3446 {
3447 char buf[128];
3448 /*
3449 * mode == 1 signals iscsi_target_tx_thread() usage.
3450 * mode == 0 signals iscsi_target_rx_thread() usage.
3451 */
3452 if (mode == 1) {
3453 if (!conn->conn_tx_reset_cpumask)
3454 return;
3455 conn->conn_tx_reset_cpumask = 0;
3456 } else {
3457 if (!conn->conn_rx_reset_cpumask)
3458 return;
3459 conn->conn_rx_reset_cpumask = 0;
3460 }
3461 /*
3462 * Update the CPU mask for this single kthread so that
3463 * both TX and RX kthreads are scheduled to run on the
3464 * same CPU.
3465 */
3466 memset(buf, 0, 128);
3467 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3468 #if 0
3469 pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():"
3470 " %s for %s\n", buf, p->comm);
3471 #endif
3472 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3473 }
3474
3475 #else
3476
iscsit_thread_get_cpumask(struct iscsi_conn * conn)3477 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3478 {
3479 return;
3480 }
3481
3482 #define iscsit_thread_check_cpumask(X, Y, Z) ({})
3483 #endif /* CONFIG_SMP */
3484
iscsi_target_tx_thread(void * arg)3485 int iscsi_target_tx_thread(void *arg)
3486 {
3487 u8 state;
3488 int eodr = 0;
3489 int ret = 0;
3490 int sent_status = 0;
3491 int use_misc = 0;
3492 int map_sg = 0;
3493 struct iscsi_cmd *cmd = NULL;
3494 struct iscsi_conn *conn;
3495 struct iscsi_queue_req *qr = NULL;
3496 struct iscsi_thread_set *ts = arg;
3497 /*
3498 * Allow ourselves to be interrupted by SIGINT so that a
3499 * connection recovery / failure event can be triggered externally.
3500 */
3501 allow_signal(SIGINT);
3502
3503 restart:
3504 conn = iscsi_tx_thread_pre_handler(ts);
3505 if (!conn)
3506 goto out;
3507
3508 eodr = map_sg = ret = sent_status = use_misc = 0;
3509
3510 while (!kthread_should_stop()) {
3511 /*
3512 * Ensure that both TX and RX per connection kthreads
3513 * are scheduled to run on the same CPU.
3514 */
3515 iscsit_thread_check_cpumask(conn, current, 1);
3516
3517 wait_event_interruptible(conn->queues_wq,
3518 !iscsit_conn_all_queues_empty(conn) ||
3519 ts->status == ISCSI_THREAD_SET_RESET);
3520
3521 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3522 signal_pending(current))
3523 goto transport_err;
3524
3525 get_immediate:
3526 qr = iscsit_get_cmd_from_immediate_queue(conn);
3527 if (qr) {
3528 atomic_set(&conn->check_immediate_queue, 0);
3529 cmd = qr->cmd;
3530 state = qr->state;
3531 kmem_cache_free(lio_qr_cache, qr);
3532
3533 spin_lock_bh(&cmd->istate_lock);
3534 switch (state) {
3535 case ISTATE_SEND_R2T:
3536 spin_unlock_bh(&cmd->istate_lock);
3537 ret = iscsit_send_r2t(cmd, conn);
3538 break;
3539 case ISTATE_REMOVE:
3540 spin_unlock_bh(&cmd->istate_lock);
3541
3542 if (cmd->data_direction == DMA_TO_DEVICE)
3543 iscsit_stop_dataout_timer(cmd);
3544
3545 spin_lock_bh(&conn->cmd_lock);
3546 list_del(&cmd->i_list);
3547 spin_unlock_bh(&conn->cmd_lock);
3548
3549 iscsit_free_cmd(cmd);
3550 goto get_immediate;
3551 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3552 spin_unlock_bh(&cmd->istate_lock);
3553 iscsit_mod_nopin_response_timer(conn);
3554 ret = iscsit_send_unsolicited_nopin(cmd,
3555 conn, 1);
3556 break;
3557 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3558 spin_unlock_bh(&cmd->istate_lock);
3559 ret = iscsit_send_unsolicited_nopin(cmd,
3560 conn, 0);
3561 break;
3562 default:
3563 pr_err("Unknown Opcode: 0x%02x ITT:"
3564 " 0x%08x, i_state: %d on CID: %hu\n",
3565 cmd->iscsi_opcode, cmd->init_task_tag, state,
3566 conn->cid);
3567 spin_unlock_bh(&cmd->istate_lock);
3568 goto transport_err;
3569 }
3570 if (ret < 0) {
3571 conn->tx_immediate_queue = 0;
3572 goto transport_err;
3573 }
3574
3575 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3576 conn->tx_immediate_queue = 0;
3577 iscsit_tx_thread_wait_for_tcp(conn);
3578 goto transport_err;
3579 }
3580
3581 spin_lock_bh(&cmd->istate_lock);
3582 switch (state) {
3583 case ISTATE_SEND_R2T:
3584 spin_unlock_bh(&cmd->istate_lock);
3585 spin_lock_bh(&cmd->dataout_timeout_lock);
3586 iscsit_start_dataout_timer(cmd, conn);
3587 spin_unlock_bh(&cmd->dataout_timeout_lock);
3588 break;
3589 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3590 cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE;
3591 spin_unlock_bh(&cmd->istate_lock);
3592 break;
3593 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3594 cmd->i_state = ISTATE_SENT_STATUS;
3595 spin_unlock_bh(&cmd->istate_lock);
3596 break;
3597 default:
3598 pr_err("Unknown Opcode: 0x%02x ITT:"
3599 " 0x%08x, i_state: %d on CID: %hu\n",
3600 cmd->iscsi_opcode, cmd->init_task_tag,
3601 state, conn->cid);
3602 spin_unlock_bh(&cmd->istate_lock);
3603 goto transport_err;
3604 }
3605 goto get_immediate;
3606 } else
3607 conn->tx_immediate_queue = 0;
3608
3609 get_response:
3610 qr = iscsit_get_cmd_from_response_queue(conn);
3611 if (qr) {
3612 cmd = qr->cmd;
3613 state = qr->state;
3614 kmem_cache_free(lio_qr_cache, qr);
3615
3616 spin_lock_bh(&cmd->istate_lock);
3617 check_rsp_state:
3618 switch (state) {
3619 case ISTATE_SEND_DATAIN:
3620 spin_unlock_bh(&cmd->istate_lock);
3621 ret = iscsit_send_data_in(cmd, conn,
3622 &eodr);
3623 map_sg = 1;
3624 break;
3625 case ISTATE_SEND_STATUS:
3626 case ISTATE_SEND_STATUS_RECOVERY:
3627 spin_unlock_bh(&cmd->istate_lock);
3628 use_misc = 1;
3629 ret = iscsit_send_status(cmd, conn);
3630 break;
3631 case ISTATE_SEND_LOGOUTRSP:
3632 spin_unlock_bh(&cmd->istate_lock);
3633 use_misc = 1;
3634 ret = iscsit_send_logout_response(cmd, conn);
3635 break;
3636 case ISTATE_SEND_ASYNCMSG:
3637 spin_unlock_bh(&cmd->istate_lock);
3638 use_misc = 1;
3639 ret = iscsit_send_conn_drop_async_message(
3640 cmd, conn);
3641 break;
3642 case ISTATE_SEND_NOPIN:
3643 spin_unlock_bh(&cmd->istate_lock);
3644 use_misc = 1;
3645 ret = iscsit_send_nopin_response(cmd, conn);
3646 break;
3647 case ISTATE_SEND_REJECT:
3648 spin_unlock_bh(&cmd->istate_lock);
3649 use_misc = 1;
3650 ret = iscsit_send_reject(cmd, conn);
3651 break;
3652 case ISTATE_SEND_TASKMGTRSP:
3653 spin_unlock_bh(&cmd->istate_lock);
3654 use_misc = 1;
3655 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3656 if (ret != 0)
3657 break;
3658 ret = iscsit_tmr_post_handler(cmd, conn);
3659 if (ret != 0)
3660 iscsit_fall_back_to_erl0(conn->sess);
3661 break;
3662 case ISTATE_SEND_TEXTRSP:
3663 spin_unlock_bh(&cmd->istate_lock);
3664 use_misc = 1;
3665 ret = iscsit_send_text_rsp(cmd, conn);
3666 break;
3667 default:
3668 pr_err("Unknown Opcode: 0x%02x ITT:"
3669 " 0x%08x, i_state: %d on CID: %hu\n",
3670 cmd->iscsi_opcode, cmd->init_task_tag,
3671 state, conn->cid);
3672 spin_unlock_bh(&cmd->istate_lock);
3673 goto transport_err;
3674 }
3675 if (ret < 0) {
3676 conn->tx_response_queue = 0;
3677 goto transport_err;
3678 }
3679
3680 if (map_sg && !conn->conn_ops->IFMarker) {
3681 if (iscsit_fe_sendpage_sg(cmd, conn) < 0) {
3682 conn->tx_response_queue = 0;
3683 iscsit_tx_thread_wait_for_tcp(conn);
3684 iscsit_unmap_iovec(cmd);
3685 goto transport_err;
3686 }
3687 } else {
3688 if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) {
3689 conn->tx_response_queue = 0;
3690 iscsit_tx_thread_wait_for_tcp(conn);
3691 iscsit_unmap_iovec(cmd);
3692 goto transport_err;
3693 }
3694 }
3695 map_sg = 0;
3696 iscsit_unmap_iovec(cmd);
3697
3698 spin_lock_bh(&cmd->istate_lock);
3699 switch (state) {
3700 case ISTATE_SEND_DATAIN:
3701 if (!eodr)
3702 goto check_rsp_state;
3703
3704 if (eodr == 1) {
3705 cmd->i_state = ISTATE_SENT_LAST_DATAIN;
3706 sent_status = 1;
3707 eodr = use_misc = 0;
3708 } else if (eodr == 2) {
3709 cmd->i_state = state =
3710 ISTATE_SEND_STATUS;
3711 sent_status = 0;
3712 eodr = use_misc = 0;
3713 goto check_rsp_state;
3714 }
3715 break;
3716 case ISTATE_SEND_STATUS:
3717 use_misc = 0;
3718 sent_status = 1;
3719 break;
3720 case ISTATE_SEND_ASYNCMSG:
3721 case ISTATE_SEND_NOPIN:
3722 case ISTATE_SEND_STATUS_RECOVERY:
3723 case ISTATE_SEND_TEXTRSP:
3724 use_misc = 0;
3725 sent_status = 1;
3726 break;
3727 case ISTATE_SEND_REJECT:
3728 use_misc = 0;
3729 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3730 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3731 spin_unlock_bh(&cmd->istate_lock);
3732 complete(&cmd->reject_comp);
3733 goto transport_err;
3734 }
3735 complete(&cmd->reject_comp);
3736 break;
3737 case ISTATE_SEND_TASKMGTRSP:
3738 use_misc = 0;
3739 sent_status = 1;
3740 break;
3741 case ISTATE_SEND_LOGOUTRSP:
3742 spin_unlock_bh(&cmd->istate_lock);
3743 if (!iscsit_logout_post_handler(cmd, conn))
3744 goto restart;
3745 spin_lock_bh(&cmd->istate_lock);
3746 use_misc = 0;
3747 sent_status = 1;
3748 break;
3749 default:
3750 pr_err("Unknown Opcode: 0x%02x ITT:"
3751 " 0x%08x, i_state: %d on CID: %hu\n",
3752 cmd->iscsi_opcode, cmd->init_task_tag,
3753 cmd->i_state, conn->cid);
3754 spin_unlock_bh(&cmd->istate_lock);
3755 goto transport_err;
3756 }
3757
3758 if (sent_status) {
3759 cmd->i_state = ISTATE_SENT_STATUS;
3760 sent_status = 0;
3761 }
3762 spin_unlock_bh(&cmd->istate_lock);
3763
3764 if (atomic_read(&conn->check_immediate_queue))
3765 goto get_immediate;
3766
3767 goto get_response;
3768 } else
3769 conn->tx_response_queue = 0;
3770 }
3771
3772 transport_err:
3773 iscsit_take_action_for_connection_exit(conn);
3774 goto restart;
3775 out:
3776 return 0;
3777 }
3778
iscsi_target_rx_thread(void * arg)3779 int iscsi_target_rx_thread(void *arg)
3780 {
3781 int ret;
3782 u8 buffer[ISCSI_HDR_LEN], opcode;
3783 u32 checksum = 0, digest = 0;
3784 struct iscsi_conn *conn = NULL;
3785 struct iscsi_thread_set *ts = arg;
3786 struct kvec iov;
3787 /*
3788 * Allow ourselves to be interrupted by SIGINT so that a
3789 * connection recovery / failure event can be triggered externally.
3790 */
3791 allow_signal(SIGINT);
3792
3793 restart:
3794 conn = iscsi_rx_thread_pre_handler(ts);
3795 if (!conn)
3796 goto out;
3797
3798 while (!kthread_should_stop()) {
3799 /*
3800 * Ensure that both TX and RX per connection kthreads
3801 * are scheduled to run on the same CPU.
3802 */
3803 iscsit_thread_check_cpumask(conn, current, 0);
3804
3805 memset(buffer, 0, ISCSI_HDR_LEN);
3806 memset(&iov, 0, sizeof(struct kvec));
3807
3808 iov.iov_base = buffer;
3809 iov.iov_len = ISCSI_HDR_LEN;
3810
3811 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3812 if (ret != ISCSI_HDR_LEN) {
3813 iscsit_rx_thread_wait_for_tcp(conn);
3814 goto transport_err;
3815 }
3816
3817 /*
3818 * Set conn->bad_hdr for use with REJECT PDUs.
3819 */
3820 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3821
3822 if (conn->conn_ops->HeaderDigest) {
3823 iov.iov_base = &digest;
3824 iov.iov_len = ISCSI_CRC_LEN;
3825
3826 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3827 if (ret != ISCSI_CRC_LEN) {
3828 iscsit_rx_thread_wait_for_tcp(conn);
3829 goto transport_err;
3830 }
3831
3832 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3833 buffer, ISCSI_HDR_LEN,
3834 0, NULL, (u8 *)&checksum);
3835
3836 if (digest != checksum) {
3837 pr_err("HeaderDigest CRC32C failed,"
3838 " received 0x%08x, computed 0x%08x\n",
3839 digest, checksum);
3840 /*
3841 * Set the PDU to 0xff so it will intentionally
3842 * hit default in the switch below.
3843 */
3844 memset(buffer, 0xff, ISCSI_HDR_LEN);
3845 spin_lock_bh(&conn->sess->session_stats_lock);
3846 conn->sess->conn_digest_errors++;
3847 spin_unlock_bh(&conn->sess->session_stats_lock);
3848 } else {
3849 pr_debug("Got HeaderDigest CRC32C"
3850 " 0x%08x\n", checksum);
3851 }
3852 }
3853
3854 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3855 goto transport_err;
3856
3857 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3858
3859 if (conn->sess->sess_ops->SessionType &&
3860 ((!(opcode & ISCSI_OP_TEXT)) ||
3861 (!(opcode & ISCSI_OP_LOGOUT)))) {
3862 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3863 " while in Discovery Session, rejecting.\n", opcode);
3864 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3865 buffer, conn);
3866 goto transport_err;
3867 }
3868
3869 switch (opcode) {
3870 case ISCSI_OP_SCSI_CMD:
3871 if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3872 goto transport_err;
3873 break;
3874 case ISCSI_OP_SCSI_DATA_OUT:
3875 if (iscsit_handle_data_out(conn, buffer) < 0)
3876 goto transport_err;
3877 break;
3878 case ISCSI_OP_NOOP_OUT:
3879 if (iscsit_handle_nop_out(conn, buffer) < 0)
3880 goto transport_err;
3881 break;
3882 case ISCSI_OP_SCSI_TMFUNC:
3883 if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3884 goto transport_err;
3885 break;
3886 case ISCSI_OP_TEXT:
3887 if (iscsit_handle_text_cmd(conn, buffer) < 0)
3888 goto transport_err;
3889 break;
3890 case ISCSI_OP_LOGOUT:
3891 ret = iscsit_handle_logout_cmd(conn, buffer);
3892 if (ret > 0) {
3893 wait_for_completion_timeout(&conn->conn_logout_comp,
3894 SECONDS_FOR_LOGOUT_COMP * HZ);
3895 goto transport_err;
3896 } else if (ret < 0)
3897 goto transport_err;
3898 break;
3899 case ISCSI_OP_SNACK:
3900 if (iscsit_handle_snack(conn, buffer) < 0)
3901 goto transport_err;
3902 break;
3903 default:
3904 pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3905 opcode);
3906 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3907 pr_err("Cannot recover from unknown"
3908 " opcode while ERL=0, closing iSCSI connection"
3909 ".\n");
3910 goto transport_err;
3911 }
3912 if (!conn->conn_ops->OFMarker) {
3913 pr_err("Unable to recover from unknown"
3914 " opcode while OFMarker=No, closing iSCSI"
3915 " connection.\n");
3916 goto transport_err;
3917 }
3918 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3919 pr_err("Unable to recover from unknown"
3920 " opcode, closing iSCSI connection.\n");
3921 goto transport_err;
3922 }
3923 break;
3924 }
3925 }
3926
3927 transport_err:
3928 if (!signal_pending(current))
3929 atomic_set(&conn->transport_failed, 1);
3930 iscsit_take_action_for_connection_exit(conn);
3931 goto restart;
3932 out:
3933 return 0;
3934 }
3935
iscsit_release_commands_from_conn(struct iscsi_conn * conn)3936 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3937 {
3938 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3939 struct iscsi_session *sess = conn->sess;
3940 /*
3941 * We expect this function to only ever be called from either RX or TX
3942 * thread context via iscsit_close_connection() once the other context
3943 * has been reset -> returned sleeping pre-handler state.
3944 */
3945 spin_lock_bh(&conn->cmd_lock);
3946 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) {
3947
3948 list_del(&cmd->i_list);
3949 spin_unlock_bh(&conn->cmd_lock);
3950
3951 iscsit_increment_maxcmdsn(cmd, sess);
3952
3953 iscsit_free_cmd(cmd);
3954
3955 spin_lock_bh(&conn->cmd_lock);
3956 }
3957 spin_unlock_bh(&conn->cmd_lock);
3958 }
3959
iscsit_stop_timers_for_cmds(struct iscsi_conn * conn)3960 static void iscsit_stop_timers_for_cmds(
3961 struct iscsi_conn *conn)
3962 {
3963 struct iscsi_cmd *cmd;
3964
3965 spin_lock_bh(&conn->cmd_lock);
3966 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
3967 if (cmd->data_direction == DMA_TO_DEVICE)
3968 iscsit_stop_dataout_timer(cmd);
3969 }
3970 spin_unlock_bh(&conn->cmd_lock);
3971 }
3972
iscsit_close_connection(struct iscsi_conn * conn)3973 int iscsit_close_connection(
3974 struct iscsi_conn *conn)
3975 {
3976 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3977 struct iscsi_session *sess = conn->sess;
3978
3979 pr_debug("Closing iSCSI connection CID %hu on SID:"
3980 " %u\n", conn->cid, sess->sid);
3981 /*
3982 * Always up conn_logout_comp just in case the RX Thread is sleeping
3983 * and the logout response never got sent because the connection
3984 * failed.
3985 */
3986 complete(&conn->conn_logout_comp);
3987
3988 iscsi_release_thread_set(conn);
3989
3990 iscsit_stop_timers_for_cmds(conn);
3991 iscsit_stop_nopin_response_timer(conn);
3992 iscsit_stop_nopin_timer(conn);
3993 iscsit_free_queue_reqs_for_conn(conn);
3994
3995 /*
3996 * During Connection recovery drop unacknowledged out of order
3997 * commands for this connection, and prepare the other commands
3998 * for realligence.
3999 *
4000 * During normal operation clear the out of order commands (but
4001 * do not free the struct iscsi_ooo_cmdsn's) and release all
4002 * struct iscsi_cmds.
4003 */
4004 if (atomic_read(&conn->connection_recovery)) {
4005 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4006 iscsit_prepare_cmds_for_realligance(conn);
4007 } else {
4008 iscsit_clear_ooo_cmdsns_for_conn(conn);
4009 iscsit_release_commands_from_conn(conn);
4010 }
4011
4012 /*
4013 * Handle decrementing session or connection usage count if
4014 * a logout response was not able to be sent because the
4015 * connection failed. Fall back to Session Recovery here.
4016 */
4017 if (atomic_read(&conn->conn_logout_remove)) {
4018 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4019 iscsit_dec_conn_usage_count(conn);
4020 iscsit_dec_session_usage_count(sess);
4021 }
4022 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4023 iscsit_dec_conn_usage_count(conn);
4024
4025 atomic_set(&conn->conn_logout_remove, 0);
4026 atomic_set(&sess->session_reinstatement, 0);
4027 atomic_set(&sess->session_fall_back_to_erl0, 1);
4028 }
4029
4030 spin_lock_bh(&sess->conn_lock);
4031 list_del(&conn->conn_list);
4032
4033 /*
4034 * Attempt to let the Initiator know this connection failed by
4035 * sending an Connection Dropped Async Message on another
4036 * active connection.
4037 */
4038 if (atomic_read(&conn->connection_recovery))
4039 iscsit_build_conn_drop_async_message(conn);
4040
4041 spin_unlock_bh(&sess->conn_lock);
4042
4043 /*
4044 * If connection reinstatement is being performed on this connection,
4045 * up the connection reinstatement semaphore that is being blocked on
4046 * in iscsit_cause_connection_reinstatement().
4047 */
4048 spin_lock_bh(&conn->state_lock);
4049 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4050 spin_unlock_bh(&conn->state_lock);
4051 complete(&conn->conn_wait_comp);
4052 wait_for_completion(&conn->conn_post_wait_comp);
4053 spin_lock_bh(&conn->state_lock);
4054 }
4055
4056 /*
4057 * If connection reinstatement is being performed on this connection
4058 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4059 * connection wait rcfr semaphore that is being blocked on
4060 * an iscsit_connection_reinstatement_rcfr().
4061 */
4062 if (atomic_read(&conn->connection_wait_rcfr)) {
4063 spin_unlock_bh(&conn->state_lock);
4064 complete(&conn->conn_wait_rcfr_comp);
4065 wait_for_completion(&conn->conn_post_wait_comp);
4066 spin_lock_bh(&conn->state_lock);
4067 }
4068 atomic_set(&conn->connection_reinstatement, 1);
4069 spin_unlock_bh(&conn->state_lock);
4070
4071 /*
4072 * If any other processes are accessing this connection pointer we
4073 * must wait until they have completed.
4074 */
4075 iscsit_check_conn_usage_count(conn);
4076
4077 if (conn->conn_rx_hash.tfm)
4078 crypto_free_hash(conn->conn_rx_hash.tfm);
4079 if (conn->conn_tx_hash.tfm)
4080 crypto_free_hash(conn->conn_tx_hash.tfm);
4081
4082 if (conn->conn_cpumask)
4083 free_cpumask_var(conn->conn_cpumask);
4084
4085 kfree(conn->conn_ops);
4086 conn->conn_ops = NULL;
4087
4088 if (conn->sock)
4089 sock_release(conn->sock);
4090 conn->thread_set = NULL;
4091
4092 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4093 conn->conn_state = TARG_CONN_STATE_FREE;
4094 kfree(conn);
4095
4096 spin_lock_bh(&sess->conn_lock);
4097 atomic_dec(&sess->nconn);
4098 pr_debug("Decremented iSCSI connection count to %hu from node:"
4099 " %s\n", atomic_read(&sess->nconn),
4100 sess->sess_ops->InitiatorName);
4101 /*
4102 * Make sure that if one connection fails in an non ERL=2 iSCSI
4103 * Session that they all fail.
4104 */
4105 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4106 !atomic_read(&sess->session_logout))
4107 atomic_set(&sess->session_fall_back_to_erl0, 1);
4108
4109 /*
4110 * If this was not the last connection in the session, and we are
4111 * performing session reinstatement or falling back to ERL=0, call
4112 * iscsit_stop_session() without sleeping to shutdown the other
4113 * active connections.
4114 */
4115 if (atomic_read(&sess->nconn)) {
4116 if (!atomic_read(&sess->session_reinstatement) &&
4117 !atomic_read(&sess->session_fall_back_to_erl0)) {
4118 spin_unlock_bh(&sess->conn_lock);
4119 return 0;
4120 }
4121 if (!atomic_read(&sess->session_stop_active)) {
4122 atomic_set(&sess->session_stop_active, 1);
4123 spin_unlock_bh(&sess->conn_lock);
4124 iscsit_stop_session(sess, 0, 0);
4125 return 0;
4126 }
4127 spin_unlock_bh(&sess->conn_lock);
4128 return 0;
4129 }
4130
4131 /*
4132 * If this was the last connection in the session and one of the
4133 * following is occurring:
4134 *
4135 * Session Reinstatement is not being performed, and are falling back
4136 * to ERL=0 call iscsit_close_session().
4137 *
4138 * Session Logout was requested. iscsit_close_session() will be called
4139 * elsewhere.
4140 *
4141 * Session Continuation is not being performed, start the Time2Retain
4142 * handler and check if sleep_on_sess_wait_sem is active.
4143 */
4144 if (!atomic_read(&sess->session_reinstatement) &&
4145 atomic_read(&sess->session_fall_back_to_erl0)) {
4146 spin_unlock_bh(&sess->conn_lock);
4147 target_put_session(sess->se_sess);
4148
4149 return 0;
4150 } else if (atomic_read(&sess->session_logout)) {
4151 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4152 sess->session_state = TARG_SESS_STATE_FREE;
4153 spin_unlock_bh(&sess->conn_lock);
4154
4155 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4156 complete(&sess->session_wait_comp);
4157
4158 return 0;
4159 } else {
4160 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4161 sess->session_state = TARG_SESS_STATE_FAILED;
4162
4163 if (!atomic_read(&sess->session_continuation)) {
4164 spin_unlock_bh(&sess->conn_lock);
4165 iscsit_start_time2retain_handler(sess);
4166 } else
4167 spin_unlock_bh(&sess->conn_lock);
4168
4169 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4170 complete(&sess->session_wait_comp);
4171
4172 return 0;
4173 }
4174 spin_unlock_bh(&sess->conn_lock);
4175
4176 return 0;
4177 }
4178
iscsit_close_session(struct iscsi_session * sess)4179 int iscsit_close_session(struct iscsi_session *sess)
4180 {
4181 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4182 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4183
4184 if (atomic_read(&sess->nconn)) {
4185 pr_err("%d connection(s) still exist for iSCSI session"
4186 " to %s\n", atomic_read(&sess->nconn),
4187 sess->sess_ops->InitiatorName);
4188 BUG();
4189 }
4190
4191 spin_lock_bh(&se_tpg->session_lock);
4192 atomic_set(&sess->session_logout, 1);
4193 atomic_set(&sess->session_reinstatement, 1);
4194 iscsit_stop_time2retain_timer(sess);
4195 spin_unlock_bh(&se_tpg->session_lock);
4196
4197 /*
4198 * transport_deregister_session_configfs() will clear the
4199 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4200 * can be setting it again with __transport_register_session() in
4201 * iscsi_post_login_handler() again after the iscsit_stop_session()
4202 * completes in iscsi_np context.
4203 */
4204 transport_deregister_session_configfs(sess->se_sess);
4205
4206 /*
4207 * If any other processes are accessing this session pointer we must
4208 * wait until they have completed. If we are in an interrupt (the
4209 * time2retain handler) and contain and active session usage count we
4210 * restart the timer and exit.
4211 */
4212 if (!in_interrupt()) {
4213 if (iscsit_check_session_usage_count(sess) == 1)
4214 iscsit_stop_session(sess, 1, 1);
4215 } else {
4216 if (iscsit_check_session_usage_count(sess) == 2) {
4217 atomic_set(&sess->session_logout, 0);
4218 iscsit_start_time2retain_handler(sess);
4219 return 0;
4220 }
4221 }
4222
4223 transport_deregister_session(sess->se_sess);
4224
4225 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4226 iscsit_free_connection_recovery_entires(sess);
4227
4228 iscsit_free_all_ooo_cmdsns(sess);
4229
4230 spin_lock_bh(&se_tpg->session_lock);
4231 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4232 sess->session_state = TARG_SESS_STATE_FREE;
4233 pr_debug("Released iSCSI session from node: %s\n",
4234 sess->sess_ops->InitiatorName);
4235 tpg->nsessions--;
4236 if (tpg->tpg_tiqn)
4237 tpg->tpg_tiqn->tiqn_nsessions--;
4238
4239 pr_debug("Decremented number of active iSCSI Sessions on"
4240 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4241
4242 spin_lock(&sess_idr_lock);
4243 idr_remove(&sess_idr, sess->session_index);
4244 spin_unlock(&sess_idr_lock);
4245
4246 kfree(sess->sess_ops);
4247 sess->sess_ops = NULL;
4248 spin_unlock_bh(&se_tpg->session_lock);
4249
4250 kfree(sess);
4251 return 0;
4252 }
4253
iscsit_logout_post_handler_closesession(struct iscsi_conn * conn)4254 static void iscsit_logout_post_handler_closesession(
4255 struct iscsi_conn *conn)
4256 {
4257 struct iscsi_session *sess = conn->sess;
4258
4259 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4260 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4261
4262 atomic_set(&conn->conn_logout_remove, 0);
4263 complete(&conn->conn_logout_comp);
4264
4265 iscsit_dec_conn_usage_count(conn);
4266 iscsit_stop_session(sess, 1, 1);
4267 iscsit_dec_session_usage_count(sess);
4268 target_put_session(sess->se_sess);
4269 }
4270
iscsit_logout_post_handler_samecid(struct iscsi_conn * conn)4271 static void iscsit_logout_post_handler_samecid(
4272 struct iscsi_conn *conn)
4273 {
4274 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4275 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4276
4277 atomic_set(&conn->conn_logout_remove, 0);
4278 complete(&conn->conn_logout_comp);
4279
4280 iscsit_cause_connection_reinstatement(conn, 1);
4281 iscsit_dec_conn_usage_count(conn);
4282 }
4283
iscsit_logout_post_handler_diffcid(struct iscsi_conn * conn,u16 cid)4284 static void iscsit_logout_post_handler_diffcid(
4285 struct iscsi_conn *conn,
4286 u16 cid)
4287 {
4288 struct iscsi_conn *l_conn;
4289 struct iscsi_session *sess = conn->sess;
4290
4291 if (!sess)
4292 return;
4293
4294 spin_lock_bh(&sess->conn_lock);
4295 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4296 if (l_conn->cid == cid) {
4297 iscsit_inc_conn_usage_count(l_conn);
4298 break;
4299 }
4300 }
4301 spin_unlock_bh(&sess->conn_lock);
4302
4303 if (!l_conn)
4304 return;
4305
4306 if (l_conn->sock)
4307 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4308
4309 spin_lock_bh(&l_conn->state_lock);
4310 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4311 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4312 spin_unlock_bh(&l_conn->state_lock);
4313
4314 iscsit_cause_connection_reinstatement(l_conn, 1);
4315 iscsit_dec_conn_usage_count(l_conn);
4316 }
4317
4318 /*
4319 * Return of 0 causes the TX thread to restart.
4320 */
iscsit_logout_post_handler(struct iscsi_cmd * cmd,struct iscsi_conn * conn)4321 static int iscsit_logout_post_handler(
4322 struct iscsi_cmd *cmd,
4323 struct iscsi_conn *conn)
4324 {
4325 int ret = 0;
4326
4327 switch (cmd->logout_reason) {
4328 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4329 switch (cmd->logout_response) {
4330 case ISCSI_LOGOUT_SUCCESS:
4331 case ISCSI_LOGOUT_CLEANUP_FAILED:
4332 default:
4333 iscsit_logout_post_handler_closesession(conn);
4334 break;
4335 }
4336 ret = 0;
4337 break;
4338 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4339 if (conn->cid == cmd->logout_cid) {
4340 switch (cmd->logout_response) {
4341 case ISCSI_LOGOUT_SUCCESS:
4342 case ISCSI_LOGOUT_CLEANUP_FAILED:
4343 default:
4344 iscsit_logout_post_handler_samecid(conn);
4345 break;
4346 }
4347 ret = 0;
4348 } else {
4349 switch (cmd->logout_response) {
4350 case ISCSI_LOGOUT_SUCCESS:
4351 iscsit_logout_post_handler_diffcid(conn,
4352 cmd->logout_cid);
4353 break;
4354 case ISCSI_LOGOUT_CID_NOT_FOUND:
4355 case ISCSI_LOGOUT_CLEANUP_FAILED:
4356 default:
4357 break;
4358 }
4359 ret = 1;
4360 }
4361 break;
4362 case ISCSI_LOGOUT_REASON_RECOVERY:
4363 switch (cmd->logout_response) {
4364 case ISCSI_LOGOUT_SUCCESS:
4365 case ISCSI_LOGOUT_CID_NOT_FOUND:
4366 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4367 case ISCSI_LOGOUT_CLEANUP_FAILED:
4368 default:
4369 break;
4370 }
4371 ret = 1;
4372 break;
4373 default:
4374 break;
4375
4376 }
4377 return ret;
4378 }
4379
iscsit_fail_session(struct iscsi_session * sess)4380 void iscsit_fail_session(struct iscsi_session *sess)
4381 {
4382 struct iscsi_conn *conn;
4383
4384 spin_lock_bh(&sess->conn_lock);
4385 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4386 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4387 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4388 }
4389 spin_unlock_bh(&sess->conn_lock);
4390
4391 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4392 sess->session_state = TARG_SESS_STATE_FAILED;
4393 }
4394
iscsit_free_session(struct iscsi_session * sess)4395 int iscsit_free_session(struct iscsi_session *sess)
4396 {
4397 u16 conn_count = atomic_read(&sess->nconn);
4398 struct iscsi_conn *conn, *conn_tmp = NULL;
4399 int is_last;
4400
4401 spin_lock_bh(&sess->conn_lock);
4402 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4403
4404 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4405 conn_list) {
4406 if (conn_count == 0)
4407 break;
4408
4409 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4410 is_last = 1;
4411 } else {
4412 iscsit_inc_conn_usage_count(conn_tmp);
4413 is_last = 0;
4414 }
4415 iscsit_inc_conn_usage_count(conn);
4416
4417 spin_unlock_bh(&sess->conn_lock);
4418 iscsit_cause_connection_reinstatement(conn, 1);
4419 spin_lock_bh(&sess->conn_lock);
4420
4421 iscsit_dec_conn_usage_count(conn);
4422 if (is_last == 0)
4423 iscsit_dec_conn_usage_count(conn_tmp);
4424
4425 conn_count--;
4426 }
4427
4428 if (atomic_read(&sess->nconn)) {
4429 spin_unlock_bh(&sess->conn_lock);
4430 wait_for_completion(&sess->session_wait_comp);
4431 } else
4432 spin_unlock_bh(&sess->conn_lock);
4433
4434 target_put_session(sess->se_sess);
4435 return 0;
4436 }
4437
iscsit_stop_session(struct iscsi_session * sess,int session_sleep,int connection_sleep)4438 void iscsit_stop_session(
4439 struct iscsi_session *sess,
4440 int session_sleep,
4441 int connection_sleep)
4442 {
4443 u16 conn_count = atomic_read(&sess->nconn);
4444 struct iscsi_conn *conn, *conn_tmp = NULL;
4445 int is_last;
4446
4447 spin_lock_bh(&sess->conn_lock);
4448 if (session_sleep)
4449 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4450
4451 if (connection_sleep) {
4452 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4453 conn_list) {
4454 if (conn_count == 0)
4455 break;
4456
4457 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4458 is_last = 1;
4459 } else {
4460 iscsit_inc_conn_usage_count(conn_tmp);
4461 is_last = 0;
4462 }
4463 iscsit_inc_conn_usage_count(conn);
4464
4465 spin_unlock_bh(&sess->conn_lock);
4466 iscsit_cause_connection_reinstatement(conn, 1);
4467 spin_lock_bh(&sess->conn_lock);
4468
4469 iscsit_dec_conn_usage_count(conn);
4470 if (is_last == 0)
4471 iscsit_dec_conn_usage_count(conn_tmp);
4472 conn_count--;
4473 }
4474 } else {
4475 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4476 iscsit_cause_connection_reinstatement(conn, 0);
4477 }
4478
4479 if (session_sleep && atomic_read(&sess->nconn)) {
4480 spin_unlock_bh(&sess->conn_lock);
4481 wait_for_completion(&sess->session_wait_comp);
4482 } else
4483 spin_unlock_bh(&sess->conn_lock);
4484 }
4485
iscsit_release_sessions_for_tpg(struct iscsi_portal_group * tpg,int force)4486 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4487 {
4488 struct iscsi_session *sess;
4489 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4490 struct se_session *se_sess, *se_sess_tmp;
4491 int session_count = 0;
4492
4493 spin_lock_bh(&se_tpg->session_lock);
4494 if (tpg->nsessions && !force) {
4495 spin_unlock_bh(&se_tpg->session_lock);
4496 return -1;
4497 }
4498
4499 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4500 sess_list) {
4501 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4502
4503 spin_lock(&sess->conn_lock);
4504 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4505 atomic_read(&sess->session_logout) ||
4506 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4507 spin_unlock(&sess->conn_lock);
4508 continue;
4509 }
4510 atomic_set(&sess->session_reinstatement, 1);
4511 spin_unlock(&sess->conn_lock);
4512 spin_unlock_bh(&se_tpg->session_lock);
4513
4514 iscsit_free_session(sess);
4515 spin_lock_bh(&se_tpg->session_lock);
4516
4517 session_count++;
4518 }
4519 spin_unlock_bh(&se_tpg->session_lock);
4520
4521 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4522 " Group: %hu\n", session_count, tpg->tpgt);
4523 return 0;
4524 }
4525
4526 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4527 MODULE_VERSION("4.1.x");
4528 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4529 MODULE_LICENSE("GPL");
4530
4531 module_init(iscsi_target_init_module);
4532 module_exit(iscsi_target_cleanup_module);
4533