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