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 <crypto/hash.h>
20 #include <linux/string.h>
21 #include <linux/kthread.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
25 #include <linux/idr.h>
26 #include <asm/unaligned.h>
27 #include <scsi/scsi_proto.h>
28 #include <scsi/iscsi_proto.h>
29 #include <scsi/scsi_tcq.h>
30 #include <target/target_core_base.h>
31 #include <target/target_core_fabric.h>
32
33 #include <target/iscsi/iscsi_target_core.h>
34 #include "iscsi_target_parameters.h"
35 #include "iscsi_target_seq_pdu_list.h"
36 #include "iscsi_target_datain_values.h"
37 #include "iscsi_target_erl0.h"
38 #include "iscsi_target_erl1.h"
39 #include "iscsi_target_erl2.h"
40 #include "iscsi_target_login.h"
41 #include "iscsi_target_tmr.h"
42 #include "iscsi_target_tpg.h"
43 #include "iscsi_target_util.h"
44 #include "iscsi_target.h"
45 #include "iscsi_target_device.h"
46 #include <target/iscsi/iscsi_target_stat.h>
47
48 #include <target/iscsi/iscsi_transport.h>
49
50 static LIST_HEAD(g_tiqn_list);
51 static LIST_HEAD(g_np_list);
52 static DEFINE_SPINLOCK(tiqn_lock);
53 static DEFINE_MUTEX(np_lock);
54
55 static struct idr tiqn_idr;
56 struct idr sess_idr;
57 struct mutex auth_id_lock;
58 spinlock_t sess_idr_lock;
59
60 struct iscsit_global *iscsit_global;
61
62 struct kmem_cache *lio_qr_cache;
63 struct kmem_cache *lio_dr_cache;
64 struct kmem_cache *lio_ooo_cache;
65 struct kmem_cache *lio_r2t_cache;
66
67 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
68 struct iscsi_scsi_req *, u32);
69
iscsit_get_tiqn_for_login(unsigned char * buf)70 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
71 {
72 struct iscsi_tiqn *tiqn = NULL;
73
74 spin_lock(&tiqn_lock);
75 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
76 if (!strcmp(tiqn->tiqn, buf)) {
77
78 spin_lock(&tiqn->tiqn_state_lock);
79 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
80 tiqn->tiqn_access_count++;
81 spin_unlock(&tiqn->tiqn_state_lock);
82 spin_unlock(&tiqn_lock);
83 return tiqn;
84 }
85 spin_unlock(&tiqn->tiqn_state_lock);
86 }
87 }
88 spin_unlock(&tiqn_lock);
89
90 return NULL;
91 }
92
iscsit_set_tiqn_shutdown(struct iscsi_tiqn * tiqn)93 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
94 {
95 spin_lock(&tiqn->tiqn_state_lock);
96 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
97 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
98 spin_unlock(&tiqn->tiqn_state_lock);
99 return 0;
100 }
101 spin_unlock(&tiqn->tiqn_state_lock);
102
103 return -1;
104 }
105
iscsit_put_tiqn_for_login(struct iscsi_tiqn * tiqn)106 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
107 {
108 spin_lock(&tiqn->tiqn_state_lock);
109 tiqn->tiqn_access_count--;
110 spin_unlock(&tiqn->tiqn_state_lock);
111 }
112
113 /*
114 * Note that IQN formatting is expected to be done in userspace, and
115 * no explict IQN format checks are done here.
116 */
iscsit_add_tiqn(unsigned char * buf)117 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
118 {
119 struct iscsi_tiqn *tiqn = NULL;
120 int ret;
121
122 if (strlen(buf) >= ISCSI_IQN_LEN) {
123 pr_err("Target IQN exceeds %d bytes\n",
124 ISCSI_IQN_LEN);
125 return ERR_PTR(-EINVAL);
126 }
127
128 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
129 if (!tiqn) {
130 pr_err("Unable to allocate struct iscsi_tiqn\n");
131 return ERR_PTR(-ENOMEM);
132 }
133
134 sprintf(tiqn->tiqn, "%s", buf);
135 INIT_LIST_HEAD(&tiqn->tiqn_list);
136 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
137 spin_lock_init(&tiqn->tiqn_state_lock);
138 spin_lock_init(&tiqn->tiqn_tpg_lock);
139 spin_lock_init(&tiqn->sess_err_stats.lock);
140 spin_lock_init(&tiqn->login_stats.lock);
141 spin_lock_init(&tiqn->logout_stats.lock);
142
143 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
144
145 idr_preload(GFP_KERNEL);
146 spin_lock(&tiqn_lock);
147
148 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
149 if (ret < 0) {
150 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
151 spin_unlock(&tiqn_lock);
152 idr_preload_end();
153 kfree(tiqn);
154 return ERR_PTR(ret);
155 }
156 tiqn->tiqn_index = ret;
157 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
158
159 spin_unlock(&tiqn_lock);
160 idr_preload_end();
161
162 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
163
164 return tiqn;
165
166 }
167
iscsit_wait_for_tiqn(struct iscsi_tiqn * tiqn)168 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
169 {
170 /*
171 * Wait for accesses to said struct iscsi_tiqn to end.
172 */
173 spin_lock(&tiqn->tiqn_state_lock);
174 while (tiqn->tiqn_access_count != 0) {
175 spin_unlock(&tiqn->tiqn_state_lock);
176 msleep(10);
177 spin_lock(&tiqn->tiqn_state_lock);
178 }
179 spin_unlock(&tiqn->tiqn_state_lock);
180 }
181
iscsit_del_tiqn(struct iscsi_tiqn * tiqn)182 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
183 {
184 /*
185 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
186 * while holding tiqn->tiqn_state_lock. This means that all subsequent
187 * attempts to access this struct iscsi_tiqn will fail from both transport
188 * fabric and control code paths.
189 */
190 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
191 pr_err("iscsit_set_tiqn_shutdown() failed\n");
192 return;
193 }
194
195 iscsit_wait_for_tiqn(tiqn);
196
197 spin_lock(&tiqn_lock);
198 list_del(&tiqn->tiqn_list);
199 idr_remove(&tiqn_idr, tiqn->tiqn_index);
200 spin_unlock(&tiqn_lock);
201
202 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
203 tiqn->tiqn);
204 kfree(tiqn);
205 }
206
iscsit_access_np(struct iscsi_np * np,struct iscsi_portal_group * tpg)207 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
208 {
209 int ret;
210 /*
211 * Determine if the network portal is accepting storage traffic.
212 */
213 spin_lock_bh(&np->np_thread_lock);
214 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
215 spin_unlock_bh(&np->np_thread_lock);
216 return -1;
217 }
218 spin_unlock_bh(&np->np_thread_lock);
219 /*
220 * Determine if the portal group is accepting storage traffic.
221 */
222 spin_lock_bh(&tpg->tpg_state_lock);
223 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
224 spin_unlock_bh(&tpg->tpg_state_lock);
225 return -1;
226 }
227 spin_unlock_bh(&tpg->tpg_state_lock);
228
229 /*
230 * Here we serialize access across the TIQN+TPG Tuple.
231 */
232 ret = down_interruptible(&tpg->np_login_sem);
233 if (ret != 0)
234 return -1;
235
236 spin_lock_bh(&tpg->tpg_state_lock);
237 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
238 spin_unlock_bh(&tpg->tpg_state_lock);
239 up(&tpg->np_login_sem);
240 return -1;
241 }
242 spin_unlock_bh(&tpg->tpg_state_lock);
243
244 return 0;
245 }
246
iscsit_login_kref_put(struct kref * kref)247 void iscsit_login_kref_put(struct kref *kref)
248 {
249 struct iscsi_tpg_np *tpg_np = container_of(kref,
250 struct iscsi_tpg_np, tpg_np_kref);
251
252 complete(&tpg_np->tpg_np_comp);
253 }
254
iscsit_deaccess_np(struct iscsi_np * np,struct iscsi_portal_group * tpg,struct iscsi_tpg_np * tpg_np)255 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
256 struct iscsi_tpg_np *tpg_np)
257 {
258 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
259
260 up(&tpg->np_login_sem);
261
262 if (tpg_np)
263 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
264
265 if (tiqn)
266 iscsit_put_tiqn_for_login(tiqn);
267
268 return 0;
269 }
270
iscsit_check_np_match(struct sockaddr_storage * sockaddr,struct iscsi_np * np,int network_transport)271 bool iscsit_check_np_match(
272 struct sockaddr_storage *sockaddr,
273 struct iscsi_np *np,
274 int network_transport)
275 {
276 struct sockaddr_in *sock_in, *sock_in_e;
277 struct sockaddr_in6 *sock_in6, *sock_in6_e;
278 bool ip_match = false;
279 u16 port, port_e;
280
281 if (sockaddr->ss_family == AF_INET6) {
282 sock_in6 = (struct sockaddr_in6 *)sockaddr;
283 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
284
285 if (!memcmp(&sock_in6->sin6_addr.in6_u,
286 &sock_in6_e->sin6_addr.in6_u,
287 sizeof(struct in6_addr)))
288 ip_match = true;
289
290 port = ntohs(sock_in6->sin6_port);
291 port_e = ntohs(sock_in6_e->sin6_port);
292 } else {
293 sock_in = (struct sockaddr_in *)sockaddr;
294 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
295
296 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
297 ip_match = true;
298
299 port = ntohs(sock_in->sin_port);
300 port_e = ntohs(sock_in_e->sin_port);
301 }
302
303 if (ip_match && (port_e == port) &&
304 (np->np_network_transport == network_transport))
305 return true;
306
307 return false;
308 }
309
310 /*
311 * Called with mutex np_lock held
312 */
iscsit_get_np(struct sockaddr_storage * sockaddr,int network_transport)313 static struct iscsi_np *iscsit_get_np(
314 struct sockaddr_storage *sockaddr,
315 int network_transport)
316 {
317 struct iscsi_np *np;
318 bool match;
319
320 list_for_each_entry(np, &g_np_list, np_list) {
321 spin_lock_bh(&np->np_thread_lock);
322 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
323 spin_unlock_bh(&np->np_thread_lock);
324 continue;
325 }
326
327 match = iscsit_check_np_match(sockaddr, np, network_transport);
328 if (match) {
329 /*
330 * Increment the np_exports reference count now to
331 * prevent iscsit_del_np() below from being called
332 * while iscsi_tpg_add_network_portal() is called.
333 */
334 np->np_exports++;
335 spin_unlock_bh(&np->np_thread_lock);
336 return np;
337 }
338 spin_unlock_bh(&np->np_thread_lock);
339 }
340
341 return NULL;
342 }
343
iscsit_add_np(struct sockaddr_storage * sockaddr,int network_transport)344 struct iscsi_np *iscsit_add_np(
345 struct sockaddr_storage *sockaddr,
346 int network_transport)
347 {
348 struct iscsi_np *np;
349 int ret;
350
351 mutex_lock(&np_lock);
352
353 /*
354 * Locate the existing struct iscsi_np if already active..
355 */
356 np = iscsit_get_np(sockaddr, network_transport);
357 if (np) {
358 mutex_unlock(&np_lock);
359 return np;
360 }
361
362 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
363 if (!np) {
364 pr_err("Unable to allocate memory for struct iscsi_np\n");
365 mutex_unlock(&np_lock);
366 return ERR_PTR(-ENOMEM);
367 }
368
369 np->np_flags |= NPF_IP_NETWORK;
370 np->np_network_transport = network_transport;
371 spin_lock_init(&np->np_thread_lock);
372 init_completion(&np->np_restart_comp);
373 INIT_LIST_HEAD(&np->np_list);
374
375 ret = iscsi_target_setup_login_socket(np, sockaddr);
376 if (ret != 0) {
377 kfree(np);
378 mutex_unlock(&np_lock);
379 return ERR_PTR(ret);
380 }
381
382 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
383 if (IS_ERR(np->np_thread)) {
384 pr_err("Unable to create kthread: iscsi_np\n");
385 ret = PTR_ERR(np->np_thread);
386 kfree(np);
387 mutex_unlock(&np_lock);
388 return ERR_PTR(ret);
389 }
390 /*
391 * Increment the np_exports reference count now to prevent
392 * iscsit_del_np() below from being run while a new call to
393 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
394 * active. We don't need to hold np->np_thread_lock at this
395 * point because iscsi_np has not been added to g_np_list yet.
396 */
397 np->np_exports = 1;
398 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
399
400 list_add_tail(&np->np_list, &g_np_list);
401 mutex_unlock(&np_lock);
402
403 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
404 &np->np_sockaddr, np->np_transport->name);
405
406 return np;
407 }
408
iscsit_reset_np_thread(struct iscsi_np * np,struct iscsi_tpg_np * tpg_np,struct iscsi_portal_group * tpg,bool shutdown)409 int iscsit_reset_np_thread(
410 struct iscsi_np *np,
411 struct iscsi_tpg_np *tpg_np,
412 struct iscsi_portal_group *tpg,
413 bool shutdown)
414 {
415 spin_lock_bh(&np->np_thread_lock);
416 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
417 spin_unlock_bh(&np->np_thread_lock);
418 return 0;
419 }
420 np->np_thread_state = ISCSI_NP_THREAD_RESET;
421 atomic_inc(&np->np_reset_count);
422
423 if (np->np_thread) {
424 spin_unlock_bh(&np->np_thread_lock);
425 send_sig(SIGINT, np->np_thread, 1);
426 wait_for_completion(&np->np_restart_comp);
427 spin_lock_bh(&np->np_thread_lock);
428 }
429 spin_unlock_bh(&np->np_thread_lock);
430
431 if (tpg_np && shutdown) {
432 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
433
434 wait_for_completion(&tpg_np->tpg_np_comp);
435 }
436
437 return 0;
438 }
439
iscsit_free_np(struct iscsi_np * np)440 static void iscsit_free_np(struct iscsi_np *np)
441 {
442 if (np->np_socket)
443 sock_release(np->np_socket);
444 }
445
iscsit_del_np(struct iscsi_np * np)446 int iscsit_del_np(struct iscsi_np *np)
447 {
448 spin_lock_bh(&np->np_thread_lock);
449 np->np_exports--;
450 if (np->np_exports) {
451 np->enabled = true;
452 spin_unlock_bh(&np->np_thread_lock);
453 return 0;
454 }
455 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
456 spin_unlock_bh(&np->np_thread_lock);
457
458 if (np->np_thread) {
459 /*
460 * We need to send the signal to wakeup Linux/Net
461 * which may be sleeping in sock_accept()..
462 */
463 send_sig(SIGINT, np->np_thread, 1);
464 kthread_stop(np->np_thread);
465 np->np_thread = NULL;
466 }
467
468 np->np_transport->iscsit_free_np(np);
469
470 mutex_lock(&np_lock);
471 list_del(&np->np_list);
472 mutex_unlock(&np_lock);
473
474 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
475 &np->np_sockaddr, np->np_transport->name);
476
477 iscsit_put_transport(np->np_transport);
478 kfree(np);
479 return 0;
480 }
481
482 static void iscsit_get_rx_pdu(struct iscsi_conn *);
483
iscsit_queue_rsp(struct iscsi_conn * conn,struct iscsi_cmd * cmd)484 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
485 {
486 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
487 return 0;
488 }
489 EXPORT_SYMBOL(iscsit_queue_rsp);
490
iscsit_aborted_task(struct iscsi_conn * conn,struct iscsi_cmd * cmd)491 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
492 {
493 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
494
495 spin_lock_bh(&conn->cmd_lock);
496 if (!list_empty(&cmd->i_conn_node) &&
497 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
498 list_del_init(&cmd->i_conn_node);
499 spin_unlock_bh(&conn->cmd_lock);
500
501 __iscsit_free_cmd(cmd, scsi_cmd, true);
502 }
503 EXPORT_SYMBOL(iscsit_aborted_task);
504
505 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
506 u32, u32, u8 *, u8 *);
507 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
508
509 static int
iscsit_xmit_nondatain_pdu(struct iscsi_conn * conn,struct iscsi_cmd * cmd,const void * data_buf,u32 data_buf_len)510 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
511 const void *data_buf, u32 data_buf_len)
512 {
513 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
514 struct kvec *iov;
515 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
516 int ret;
517
518 iov = &cmd->iov_misc[0];
519 iov[niov].iov_base = cmd->pdu;
520 iov[niov++].iov_len = ISCSI_HDR_LEN;
521
522 if (conn->conn_ops->HeaderDigest) {
523 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
524
525 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
526 ISCSI_HDR_LEN, 0, NULL,
527 (u8 *)header_digest);
528
529 iov[0].iov_len += ISCSI_CRC_LEN;
530 tx_size += ISCSI_CRC_LEN;
531 pr_debug("Attaching CRC32C HeaderDigest"
532 " to opcode 0x%x 0x%08x\n",
533 hdr->opcode, *header_digest);
534 }
535
536 if (data_buf_len) {
537 u32 padding = ((-data_buf_len) & 3);
538
539 iov[niov].iov_base = (void *)data_buf;
540 iov[niov++].iov_len = data_buf_len;
541 tx_size += data_buf_len;
542
543 if (padding != 0) {
544 iov[niov].iov_base = &cmd->pad_bytes;
545 iov[niov++].iov_len = padding;
546 tx_size += padding;
547 pr_debug("Attaching %u additional"
548 " padding bytes.\n", padding);
549 }
550
551 if (conn->conn_ops->DataDigest) {
552 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
553 data_buf, data_buf_len,
554 padding,
555 (u8 *)&cmd->pad_bytes,
556 (u8 *)&cmd->data_crc);
557
558 iov[niov].iov_base = &cmd->data_crc;
559 iov[niov++].iov_len = ISCSI_CRC_LEN;
560 tx_size += ISCSI_CRC_LEN;
561 pr_debug("Attached DataDigest for %u"
562 " bytes opcode 0x%x, CRC 0x%08x\n",
563 data_buf_len, hdr->opcode, cmd->data_crc);
564 }
565 }
566
567 cmd->iov_misc_count = niov;
568 cmd->tx_size = tx_size;
569
570 ret = iscsit_send_tx_data(cmd, conn, 1);
571 if (ret < 0) {
572 iscsit_tx_thread_wait_for_tcp(conn);
573 return ret;
574 }
575
576 return 0;
577 }
578
579 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
580 static void iscsit_unmap_iovec(struct iscsi_cmd *);
581 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
582 u32, u32, u32, u8 *);
583 static int
iscsit_xmit_datain_pdu(struct iscsi_conn * conn,struct iscsi_cmd * cmd,const struct iscsi_datain * datain)584 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
585 const struct iscsi_datain *datain)
586 {
587 struct kvec *iov;
588 u32 iov_count = 0, tx_size = 0;
589 int ret, iov_ret;
590
591 iov = &cmd->iov_data[0];
592 iov[iov_count].iov_base = cmd->pdu;
593 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
594 tx_size += ISCSI_HDR_LEN;
595
596 if (conn->conn_ops->HeaderDigest) {
597 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
598
599 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
600 ISCSI_HDR_LEN, 0, NULL,
601 (u8 *)header_digest);
602
603 iov[0].iov_len += ISCSI_CRC_LEN;
604 tx_size += ISCSI_CRC_LEN;
605
606 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
607 *header_digest);
608 }
609
610 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
611 datain->offset, datain->length);
612 if (iov_ret < 0)
613 return -1;
614
615 iov_count += iov_ret;
616 tx_size += datain->length;
617
618 cmd->padding = ((-datain->length) & 3);
619 if (cmd->padding) {
620 iov[iov_count].iov_base = cmd->pad_bytes;
621 iov[iov_count++].iov_len = cmd->padding;
622 tx_size += cmd->padding;
623
624 pr_debug("Attaching %u padding bytes\n", cmd->padding);
625 }
626
627 if (conn->conn_ops->DataDigest) {
628 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
629 cmd, datain->offset,
630 datain->length,
631 cmd->padding,
632 cmd->pad_bytes);
633
634 iov[iov_count].iov_base = &cmd->data_crc;
635 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
636 tx_size += ISCSI_CRC_LEN;
637
638 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
639 datain->length + cmd->padding, cmd->data_crc);
640 }
641
642 cmd->iov_data_count = iov_count;
643 cmd->tx_size = tx_size;
644
645 ret = iscsit_fe_sendpage_sg(cmd, conn);
646
647 iscsit_unmap_iovec(cmd);
648
649 if (ret < 0) {
650 iscsit_tx_thread_wait_for_tcp(conn);
651 return ret;
652 }
653
654 return 0;
655 }
656
iscsit_xmit_pdu(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_datain_req * dr,const void * buf,u32 buf_len)657 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
658 struct iscsi_datain_req *dr, const void *buf,
659 u32 buf_len)
660 {
661 if (dr)
662 return iscsit_xmit_datain_pdu(conn, cmd, buf);
663 else
664 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
665 }
666
iscsit_get_sup_prot_ops(struct iscsi_conn * conn)667 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
668 {
669 return TARGET_PROT_NORMAL;
670 }
671
672 static struct iscsit_transport iscsi_target_transport = {
673 .name = "iSCSI/TCP",
674 .transport_type = ISCSI_TCP,
675 .rdma_shutdown = false,
676 .owner = NULL,
677 .iscsit_setup_np = iscsit_setup_np,
678 .iscsit_accept_np = iscsit_accept_np,
679 .iscsit_free_np = iscsit_free_np,
680 .iscsit_get_login_rx = iscsit_get_login_rx,
681 .iscsit_put_login_tx = iscsit_put_login_tx,
682 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
683 .iscsit_immediate_queue = iscsit_immediate_queue,
684 .iscsit_response_queue = iscsit_response_queue,
685 .iscsit_queue_data_in = iscsit_queue_rsp,
686 .iscsit_queue_status = iscsit_queue_rsp,
687 .iscsit_aborted_task = iscsit_aborted_task,
688 .iscsit_xmit_pdu = iscsit_xmit_pdu,
689 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
690 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
691 };
692
iscsi_target_init_module(void)693 static int __init iscsi_target_init_module(void)
694 {
695 int ret = 0, size;
696
697 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
698
699 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
700 if (!iscsit_global) {
701 pr_err("Unable to allocate memory for iscsit_global\n");
702 return -1;
703 }
704 spin_lock_init(&iscsit_global->ts_bitmap_lock);
705 mutex_init(&auth_id_lock);
706 spin_lock_init(&sess_idr_lock);
707 idr_init(&tiqn_idr);
708 idr_init(&sess_idr);
709
710 ret = target_register_template(&iscsi_ops);
711 if (ret)
712 goto out;
713
714 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
715 iscsit_global->ts_bitmap = vzalloc(size);
716 if (!iscsit_global->ts_bitmap) {
717 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
718 goto configfs_out;
719 }
720
721 lio_qr_cache = kmem_cache_create("lio_qr_cache",
722 sizeof(struct iscsi_queue_req),
723 __alignof__(struct iscsi_queue_req), 0, NULL);
724 if (!lio_qr_cache) {
725 pr_err("nable to kmem_cache_create() for"
726 " lio_qr_cache\n");
727 goto bitmap_out;
728 }
729
730 lio_dr_cache = kmem_cache_create("lio_dr_cache",
731 sizeof(struct iscsi_datain_req),
732 __alignof__(struct iscsi_datain_req), 0, NULL);
733 if (!lio_dr_cache) {
734 pr_err("Unable to kmem_cache_create() for"
735 " lio_dr_cache\n");
736 goto qr_out;
737 }
738
739 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
740 sizeof(struct iscsi_ooo_cmdsn),
741 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
742 if (!lio_ooo_cache) {
743 pr_err("Unable to kmem_cache_create() for"
744 " lio_ooo_cache\n");
745 goto dr_out;
746 }
747
748 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
749 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
750 0, NULL);
751 if (!lio_r2t_cache) {
752 pr_err("Unable to kmem_cache_create() for"
753 " lio_r2t_cache\n");
754 goto ooo_out;
755 }
756
757 iscsit_register_transport(&iscsi_target_transport);
758
759 if (iscsit_load_discovery_tpg() < 0)
760 goto r2t_out;
761
762 return ret;
763 r2t_out:
764 iscsit_unregister_transport(&iscsi_target_transport);
765 kmem_cache_destroy(lio_r2t_cache);
766 ooo_out:
767 kmem_cache_destroy(lio_ooo_cache);
768 dr_out:
769 kmem_cache_destroy(lio_dr_cache);
770 qr_out:
771 kmem_cache_destroy(lio_qr_cache);
772 bitmap_out:
773 vfree(iscsit_global->ts_bitmap);
774 configfs_out:
775 /* XXX: this probably wants it to be it's own unwind step.. */
776 if (iscsit_global->discovery_tpg)
777 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
778 target_unregister_template(&iscsi_ops);
779 out:
780 kfree(iscsit_global);
781 return -ENOMEM;
782 }
783
iscsi_target_cleanup_module(void)784 static void __exit iscsi_target_cleanup_module(void)
785 {
786 iscsit_release_discovery_tpg();
787 iscsit_unregister_transport(&iscsi_target_transport);
788 kmem_cache_destroy(lio_qr_cache);
789 kmem_cache_destroy(lio_dr_cache);
790 kmem_cache_destroy(lio_ooo_cache);
791 kmem_cache_destroy(lio_r2t_cache);
792
793 /*
794 * Shutdown discovery sessions and disable discovery TPG
795 */
796 if (iscsit_global->discovery_tpg)
797 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
798
799 target_unregister_template(&iscsi_ops);
800
801 vfree(iscsit_global->ts_bitmap);
802 kfree(iscsit_global);
803 }
804
iscsit_add_reject(struct iscsi_conn * conn,u8 reason,unsigned char * buf)805 int iscsit_add_reject(
806 struct iscsi_conn *conn,
807 u8 reason,
808 unsigned char *buf)
809 {
810 struct iscsi_cmd *cmd;
811
812 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
813 if (!cmd)
814 return -1;
815
816 cmd->iscsi_opcode = ISCSI_OP_REJECT;
817 cmd->reject_reason = reason;
818
819 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
820 if (!cmd->buf_ptr) {
821 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
822 iscsit_free_cmd(cmd, false);
823 return -1;
824 }
825
826 spin_lock_bh(&conn->cmd_lock);
827 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
828 spin_unlock_bh(&conn->cmd_lock);
829
830 cmd->i_state = ISTATE_SEND_REJECT;
831 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
832
833 return -1;
834 }
835 EXPORT_SYMBOL(iscsit_add_reject);
836
iscsit_add_reject_from_cmd(struct iscsi_cmd * cmd,u8 reason,bool add_to_conn,unsigned char * buf)837 static int iscsit_add_reject_from_cmd(
838 struct iscsi_cmd *cmd,
839 u8 reason,
840 bool add_to_conn,
841 unsigned char *buf)
842 {
843 struct iscsi_conn *conn;
844 const bool do_put = cmd->se_cmd.se_tfo != NULL;
845
846 if (!cmd->conn) {
847 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
848 cmd->init_task_tag);
849 return -1;
850 }
851 conn = cmd->conn;
852
853 cmd->iscsi_opcode = ISCSI_OP_REJECT;
854 cmd->reject_reason = reason;
855
856 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
857 if (!cmd->buf_ptr) {
858 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
859 iscsit_free_cmd(cmd, false);
860 return -1;
861 }
862
863 if (add_to_conn) {
864 spin_lock_bh(&conn->cmd_lock);
865 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
866 spin_unlock_bh(&conn->cmd_lock);
867 }
868
869 cmd->i_state = ISTATE_SEND_REJECT;
870 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
871 /*
872 * Perform the kref_put now if se_cmd has already been setup by
873 * scsit_setup_scsi_cmd()
874 */
875 if (do_put) {
876 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
877 target_put_sess_cmd(&cmd->se_cmd);
878 }
879 return -1;
880 }
881
iscsit_add_reject_cmd(struct iscsi_cmd * cmd,u8 reason,unsigned char * buf)882 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
883 unsigned char *buf)
884 {
885 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
886 }
887
iscsit_reject_cmd(struct iscsi_cmd * cmd,u8 reason,unsigned char * buf)888 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
889 {
890 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
891 }
892 EXPORT_SYMBOL(iscsit_reject_cmd);
893
894 /*
895 * Map some portion of the allocated scatterlist to an iovec, suitable for
896 * kernel sockets to copy data in/out.
897 */
iscsit_map_iovec(struct iscsi_cmd * cmd,struct kvec * iov,u32 data_offset,u32 data_length)898 static int iscsit_map_iovec(
899 struct iscsi_cmd *cmd,
900 struct kvec *iov,
901 u32 data_offset,
902 u32 data_length)
903 {
904 u32 i = 0;
905 struct scatterlist *sg;
906 unsigned int page_off;
907
908 /*
909 * We know each entry in t_data_sg contains a page.
910 */
911 u32 ent = data_offset / PAGE_SIZE;
912
913 if (ent >= cmd->se_cmd.t_data_nents) {
914 pr_err("Initial page entry out-of-bounds\n");
915 return -1;
916 }
917
918 sg = &cmd->se_cmd.t_data_sg[ent];
919 page_off = (data_offset % PAGE_SIZE);
920
921 cmd->first_data_sg = sg;
922 cmd->first_data_sg_off = page_off;
923
924 while (data_length) {
925 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
926
927 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
928 iov[i].iov_len = cur_len;
929
930 data_length -= cur_len;
931 page_off = 0;
932 sg = sg_next(sg);
933 i++;
934 }
935
936 cmd->kmapped_nents = i;
937
938 return i;
939 }
940
iscsit_unmap_iovec(struct iscsi_cmd * cmd)941 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
942 {
943 u32 i;
944 struct scatterlist *sg;
945
946 sg = cmd->first_data_sg;
947
948 for (i = 0; i < cmd->kmapped_nents; i++)
949 kunmap(sg_page(&sg[i]));
950 }
951
iscsit_ack_from_expstatsn(struct iscsi_conn * conn,u32 exp_statsn)952 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
953 {
954 LIST_HEAD(ack_list);
955 struct iscsi_cmd *cmd, *cmd_p;
956
957 conn->exp_statsn = exp_statsn;
958
959 if (conn->sess->sess_ops->RDMAExtensions)
960 return;
961
962 spin_lock_bh(&conn->cmd_lock);
963 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
964 spin_lock(&cmd->istate_lock);
965 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
966 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
967 cmd->i_state = ISTATE_REMOVE;
968 spin_unlock(&cmd->istate_lock);
969 list_move_tail(&cmd->i_conn_node, &ack_list);
970 continue;
971 }
972 spin_unlock(&cmd->istate_lock);
973 }
974 spin_unlock_bh(&conn->cmd_lock);
975
976 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
977 list_del_init(&cmd->i_conn_node);
978 iscsit_free_cmd(cmd, false);
979 }
980 }
981
iscsit_allocate_iovecs(struct iscsi_cmd * cmd)982 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
983 {
984 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
985
986 iov_count += ISCSI_IOV_DATA_BUFFER;
987
988 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
989 if (!cmd->iov_data) {
990 pr_err("Unable to allocate cmd->iov_data\n");
991 return -ENOMEM;
992 }
993
994 cmd->orig_iov_data_count = iov_count;
995 return 0;
996 }
997
iscsit_setup_scsi_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)998 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
999 unsigned char *buf)
1000 {
1001 int data_direction, payload_length;
1002 struct iscsi_scsi_req *hdr;
1003 int iscsi_task_attr;
1004 int sam_task_attr;
1005
1006 atomic_long_inc(&conn->sess->cmd_pdus);
1007
1008 hdr = (struct iscsi_scsi_req *) buf;
1009 payload_length = ntoh24(hdr->dlength);
1010
1011 /* FIXME; Add checks for AdditionalHeaderSegment */
1012
1013 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1014 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1015 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1016 " not set. Bad iSCSI Initiator.\n");
1017 return iscsit_add_reject_cmd(cmd,
1018 ISCSI_REASON_BOOKMARK_INVALID, buf);
1019 }
1020
1021 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1022 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1023 /*
1024 * From RFC-3720 Section 10.3.1:
1025 *
1026 * "Either or both of R and W MAY be 1 when either the
1027 * Expected Data Transfer Length and/or Bidirectional Read
1028 * Expected Data Transfer Length are 0"
1029 *
1030 * For this case, go ahead and clear the unnecssary bits
1031 * to avoid any confusion with ->data_direction.
1032 */
1033 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1034 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1035
1036 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1037 " set when Expected Data Transfer Length is 0 for"
1038 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1039 }
1040
1041 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1042 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1043 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1044 " MUST be set if Expected Data Transfer Length is not 0."
1045 " Bad iSCSI Initiator\n");
1046 return iscsit_add_reject_cmd(cmd,
1047 ISCSI_REASON_BOOKMARK_INVALID, buf);
1048 }
1049
1050 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1051 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1052 pr_err("Bidirectional operations not supported!\n");
1053 return iscsit_add_reject_cmd(cmd,
1054 ISCSI_REASON_BOOKMARK_INVALID, buf);
1055 }
1056
1057 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1058 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1059 " Scsi Command PDU.\n");
1060 return iscsit_add_reject_cmd(cmd,
1061 ISCSI_REASON_BOOKMARK_INVALID, buf);
1062 }
1063
1064 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1065 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1066 " protocol error.\n", payload_length);
1067 return iscsit_add_reject_cmd(cmd,
1068 ISCSI_REASON_PROTOCOL_ERROR, buf);
1069 }
1070
1071 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1072 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1073 pr_err("Expected Data Transfer Length and Length of"
1074 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1075 " bit is not set protocol error\n");
1076 return iscsit_add_reject_cmd(cmd,
1077 ISCSI_REASON_PROTOCOL_ERROR, buf);
1078 }
1079
1080 if (payload_length > be32_to_cpu(hdr->data_length)) {
1081 pr_err("DataSegmentLength: %u is greater than"
1082 " EDTL: %u, protocol error.\n", payload_length,
1083 hdr->data_length);
1084 return iscsit_add_reject_cmd(cmd,
1085 ISCSI_REASON_PROTOCOL_ERROR, buf);
1086 }
1087
1088 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1089 pr_err("DataSegmentLength: %u is greater than"
1090 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1091 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1092 return iscsit_add_reject_cmd(cmd,
1093 ISCSI_REASON_PROTOCOL_ERROR, buf);
1094 }
1095
1096 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1097 pr_err("DataSegmentLength: %u is greater than"
1098 " FirstBurstLength: %u, protocol error.\n",
1099 payload_length, conn->sess->sess_ops->FirstBurstLength);
1100 return iscsit_add_reject_cmd(cmd,
1101 ISCSI_REASON_BOOKMARK_INVALID, buf);
1102 }
1103
1104 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1105 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1106 DMA_NONE;
1107
1108 cmd->data_direction = data_direction;
1109 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1110 /*
1111 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1112 */
1113 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1114 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1115 sam_task_attr = TCM_SIMPLE_TAG;
1116 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1117 sam_task_attr = TCM_ORDERED_TAG;
1118 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1119 sam_task_attr = TCM_HEAD_TAG;
1120 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1121 sam_task_attr = TCM_ACA_TAG;
1122 else {
1123 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1124 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1125 sam_task_attr = TCM_SIMPLE_TAG;
1126 }
1127
1128 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1129 cmd->i_state = ISTATE_NEW_CMD;
1130 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1131 cmd->immediate_data = (payload_length) ? 1 : 0;
1132 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1133 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1134 if (cmd->unsolicited_data)
1135 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1136
1137 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1138 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1139 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1140 else
1141 cmd->targ_xfer_tag = 0xFFFFFFFF;
1142 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1143 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1144 cmd->first_burst_len = payload_length;
1145
1146 if (!conn->sess->sess_ops->RDMAExtensions &&
1147 cmd->data_direction == DMA_FROM_DEVICE) {
1148 struct iscsi_datain_req *dr;
1149
1150 dr = iscsit_allocate_datain_req();
1151 if (!dr)
1152 return iscsit_add_reject_cmd(cmd,
1153 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1154
1155 iscsit_attach_datain_req(cmd, dr);
1156 }
1157
1158 /*
1159 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1160 */
1161 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1162 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1163 cmd->data_direction, sam_task_attr,
1164 cmd->sense_buffer + 2);
1165
1166 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1167 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1168 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1169 conn->cid);
1170
1171 target_get_sess_cmd(&cmd->se_cmd, true);
1172
1173 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1174 scsilun_to_int(&hdr->lun));
1175 if (cmd->sense_reason)
1176 goto attach_cmd;
1177
1178 /* only used for printks or comparing with ->ref_task_tag */
1179 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1180 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1181 if (cmd->sense_reason) {
1182 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1183 return iscsit_add_reject_cmd(cmd,
1184 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1185 }
1186
1187 goto attach_cmd;
1188 }
1189
1190 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1191 return iscsit_add_reject_cmd(cmd,
1192 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1193 }
1194
1195 attach_cmd:
1196 spin_lock_bh(&conn->cmd_lock);
1197 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1198 spin_unlock_bh(&conn->cmd_lock);
1199 /*
1200 * Check if we need to delay processing because of ALUA
1201 * Active/NonOptimized primary access state..
1202 */
1203 core_alua_check_nonop_delay(&cmd->se_cmd);
1204
1205 return 0;
1206 }
1207 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1208
iscsit_set_unsoliticed_dataout(struct iscsi_cmd * cmd)1209 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1210 {
1211 iscsit_set_dataout_sequence_values(cmd);
1212
1213 spin_lock_bh(&cmd->dataout_timeout_lock);
1214 iscsit_start_dataout_timer(cmd, cmd->conn);
1215 spin_unlock_bh(&cmd->dataout_timeout_lock);
1216 }
1217 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1218
iscsit_process_scsi_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_scsi_req * hdr)1219 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1220 struct iscsi_scsi_req *hdr)
1221 {
1222 int cmdsn_ret = 0;
1223 /*
1224 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1225 * the Immediate Bit is not set, and no Immediate
1226 * Data is attached.
1227 *
1228 * A PDU/CmdSN carrying Immediate Data can only
1229 * be processed after the DataCRC has passed.
1230 * If the DataCRC fails, the CmdSN MUST NOT
1231 * be acknowledged. (See below)
1232 */
1233 if (!cmd->immediate_data) {
1234 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1235 (unsigned char *)hdr, hdr->cmdsn);
1236 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1237 return -1;
1238 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1239 target_put_sess_cmd(&cmd->se_cmd);
1240 return 0;
1241 }
1242 }
1243
1244 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1245
1246 /*
1247 * If no Immediate Data is attached, it's OK to return now.
1248 */
1249 if (!cmd->immediate_data) {
1250 if (!cmd->sense_reason && cmd->unsolicited_data)
1251 iscsit_set_unsoliticed_dataout(cmd);
1252 if (!cmd->sense_reason)
1253 return 0;
1254
1255 target_put_sess_cmd(&cmd->se_cmd);
1256 return 0;
1257 }
1258
1259 /*
1260 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1261 * execution. These exceptions are processed in CmdSN order using
1262 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1263 */
1264 if (cmd->sense_reason) {
1265 if (cmd->reject_reason)
1266 return 0;
1267
1268 return 1;
1269 }
1270 /*
1271 * Call directly into transport_generic_new_cmd() to perform
1272 * the backend memory allocation.
1273 */
1274 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1275 if (cmd->sense_reason)
1276 return 1;
1277
1278 return 0;
1279 }
1280 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1281
1282 static int
iscsit_get_immediate_data(struct iscsi_cmd * cmd,struct iscsi_scsi_req * hdr,bool dump_payload)1283 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1284 bool dump_payload)
1285 {
1286 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1287 /*
1288 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1289 */
1290 if (dump_payload)
1291 goto after_immediate_data;
1292 /*
1293 * Check for underflow case where both EDTL and immediate data payload
1294 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1295 * already been set in target_cmd_size_check() as se_cmd->data_length.
1296 *
1297 * For this special case, fail the command and dump the immediate data
1298 * payload.
1299 */
1300 if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1301 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1302 goto after_immediate_data;
1303 }
1304
1305 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1306 cmd->first_burst_len);
1307 after_immediate_data:
1308 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1309 /*
1310 * A PDU/CmdSN carrying Immediate Data passed
1311 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1312 * Immediate Bit is not set.
1313 */
1314 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1315 (unsigned char *)hdr, hdr->cmdsn);
1316 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1317 return -1;
1318
1319 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1320 int rc;
1321
1322 rc = iscsit_dump_data_payload(cmd->conn,
1323 cmd->first_burst_len, 1);
1324 target_put_sess_cmd(&cmd->se_cmd);
1325 return rc;
1326 } else if (cmd->unsolicited_data)
1327 iscsit_set_unsoliticed_dataout(cmd);
1328
1329 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1330 /*
1331 * Immediate Data failed DataCRC and ERL>=1,
1332 * silently drop this PDU and let the initiator
1333 * plug the CmdSN gap.
1334 *
1335 * FIXME: Send Unsolicited NOPIN with reserved
1336 * TTT here to help the initiator figure out
1337 * the missing CmdSN, although they should be
1338 * intelligent enough to determine the missing
1339 * CmdSN and issue a retry to plug the sequence.
1340 */
1341 cmd->i_state = ISTATE_REMOVE;
1342 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1343 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1344 return -1;
1345
1346 return 0;
1347 }
1348
1349 static int
iscsit_handle_scsi_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)1350 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1351 unsigned char *buf)
1352 {
1353 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1354 int rc, immed_data;
1355 bool dump_payload = false;
1356
1357 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1358 if (rc < 0)
1359 return 0;
1360 /*
1361 * Allocation iovecs needed for struct socket operations for
1362 * traditional iSCSI block I/O.
1363 */
1364 if (iscsit_allocate_iovecs(cmd) < 0) {
1365 return iscsit_reject_cmd(cmd,
1366 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1367 }
1368 immed_data = cmd->immediate_data;
1369
1370 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1371 if (rc < 0)
1372 return rc;
1373 else if (rc > 0)
1374 dump_payload = true;
1375
1376 if (!immed_data)
1377 return 0;
1378
1379 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1380 }
1381
iscsit_do_crypto_hash_sg(struct ahash_request * hash,struct iscsi_cmd * cmd,u32 data_offset,u32 data_length,u32 padding,u8 * pad_bytes)1382 static u32 iscsit_do_crypto_hash_sg(
1383 struct ahash_request *hash,
1384 struct iscsi_cmd *cmd,
1385 u32 data_offset,
1386 u32 data_length,
1387 u32 padding,
1388 u8 *pad_bytes)
1389 {
1390 u32 data_crc;
1391 struct scatterlist *sg;
1392 unsigned int page_off;
1393
1394 crypto_ahash_init(hash);
1395
1396 sg = cmd->first_data_sg;
1397 page_off = cmd->first_data_sg_off;
1398
1399 while (data_length) {
1400 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1401
1402 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1403 crypto_ahash_update(hash);
1404
1405 data_length -= cur_len;
1406 page_off = 0;
1407 /* iscsit_map_iovec has already checked for invalid sg pointers */
1408 sg = sg_next(sg);
1409 }
1410
1411 if (padding) {
1412 struct scatterlist pad_sg;
1413
1414 sg_init_one(&pad_sg, pad_bytes, padding);
1415 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1416 padding);
1417 crypto_ahash_finup(hash);
1418 } else {
1419 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1420 crypto_ahash_final(hash);
1421 }
1422
1423 return data_crc;
1424 }
1425
iscsit_do_crypto_hash_buf(struct ahash_request * hash,const void * buf,u32 payload_length,u32 padding,u8 * pad_bytes,u8 * data_crc)1426 static void iscsit_do_crypto_hash_buf(
1427 struct ahash_request *hash,
1428 const void *buf,
1429 u32 payload_length,
1430 u32 padding,
1431 u8 *pad_bytes,
1432 u8 *data_crc)
1433 {
1434 struct scatterlist sg[2];
1435
1436 sg_init_table(sg, ARRAY_SIZE(sg));
1437 sg_set_buf(sg, buf, payload_length);
1438 sg_set_buf(sg + 1, pad_bytes, padding);
1439
1440 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1441
1442 crypto_ahash_digest(hash);
1443 }
1444
1445 int
iscsit_check_dataout_hdr(struct iscsi_conn * conn,unsigned char * buf,struct iscsi_cmd ** out_cmd)1446 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1447 struct iscsi_cmd **out_cmd)
1448 {
1449 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1450 struct iscsi_cmd *cmd = NULL;
1451 struct se_cmd *se_cmd;
1452 u32 payload_length = ntoh24(hdr->dlength);
1453 int rc;
1454
1455 if (!payload_length) {
1456 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1457 return 0;
1458 }
1459
1460 /* iSCSI write */
1461 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1462
1463 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1464 pr_err("DataSegmentLength: %u is greater than"
1465 " MaxXmitDataSegmentLength: %u\n", payload_length,
1466 conn->conn_ops->MaxXmitDataSegmentLength);
1467 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1468 buf);
1469 }
1470
1471 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1472 payload_length);
1473 if (!cmd)
1474 return 0;
1475
1476 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1477 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1478 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1479 payload_length, conn->cid);
1480
1481 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1482 pr_err("Command ITT: 0x%08x received DataOUT after"
1483 " last DataOUT received, dumping payload\n",
1484 cmd->init_task_tag);
1485 return iscsit_dump_data_payload(conn, payload_length, 1);
1486 }
1487
1488 if (cmd->data_direction != DMA_TO_DEVICE) {
1489 pr_err("Command ITT: 0x%08x received DataOUT for a"
1490 " NON-WRITE command.\n", cmd->init_task_tag);
1491 return iscsit_dump_data_payload(conn, payload_length, 1);
1492 }
1493 se_cmd = &cmd->se_cmd;
1494 iscsit_mod_dataout_timer(cmd);
1495
1496 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1497 pr_err("DataOut Offset: %u, Length %u greater than"
1498 " iSCSI Command EDTL %u, protocol error.\n",
1499 hdr->offset, payload_length, cmd->se_cmd.data_length);
1500 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1501 }
1502
1503 if (cmd->unsolicited_data) {
1504 int dump_unsolicited_data = 0;
1505
1506 if (conn->sess->sess_ops->InitialR2T) {
1507 pr_err("Received unexpected unsolicited data"
1508 " while InitialR2T=Yes, protocol error.\n");
1509 transport_send_check_condition_and_sense(&cmd->se_cmd,
1510 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1511 return -1;
1512 }
1513 /*
1514 * Special case for dealing with Unsolicited DataOUT
1515 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1516 * failures;
1517 */
1518
1519 /* Something's amiss if we're not in WRITE_PENDING state... */
1520 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1521 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1522 dump_unsolicited_data = 1;
1523
1524 if (dump_unsolicited_data) {
1525 /*
1526 * Check if a delayed TASK_ABORTED status needs to
1527 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1528 * received with the unsolicited data out.
1529 */
1530 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1531 iscsit_stop_dataout_timer(cmd);
1532
1533 transport_check_aborted_status(se_cmd,
1534 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1535 return iscsit_dump_data_payload(conn, payload_length, 1);
1536 }
1537 } else {
1538 /*
1539 * For the normal solicited data path:
1540 *
1541 * Check for a delayed TASK_ABORTED status and dump any
1542 * incoming data out payload if one exists. Also, when the
1543 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1544 * data out sequence, we decrement outstanding_r2ts. Once
1545 * outstanding_r2ts reaches zero, go ahead and send the delayed
1546 * TASK_ABORTED status.
1547 */
1548 if (se_cmd->transport_state & CMD_T_ABORTED) {
1549 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1550 if (--cmd->outstanding_r2ts < 1) {
1551 iscsit_stop_dataout_timer(cmd);
1552 transport_check_aborted_status(
1553 se_cmd, 1);
1554 }
1555
1556 return iscsit_dump_data_payload(conn, payload_length, 1);
1557 }
1558 }
1559 /*
1560 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1561 * within-command recovery checks before receiving the payload.
1562 */
1563 rc = iscsit_check_pre_dataout(cmd, buf);
1564 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1565 return 0;
1566 else if (rc == DATAOUT_CANNOT_RECOVER)
1567 return -1;
1568
1569 *out_cmd = cmd;
1570 return 0;
1571 }
1572 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1573
1574 static int
iscsit_get_dataout(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_data * hdr)1575 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1576 struct iscsi_data *hdr)
1577 {
1578 struct kvec *iov;
1579 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1580 u32 payload_length = ntoh24(hdr->dlength);
1581 int iov_ret, data_crc_failed = 0;
1582
1583 rx_size += payload_length;
1584 iov = &cmd->iov_data[0];
1585
1586 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1587 payload_length);
1588 if (iov_ret < 0)
1589 return -1;
1590
1591 iov_count += iov_ret;
1592
1593 padding = ((-payload_length) & 3);
1594 if (padding != 0) {
1595 iov[iov_count].iov_base = cmd->pad_bytes;
1596 iov[iov_count++].iov_len = padding;
1597 rx_size += padding;
1598 pr_debug("Receiving %u padding bytes.\n", padding);
1599 }
1600
1601 if (conn->conn_ops->DataDigest) {
1602 iov[iov_count].iov_base = &checksum;
1603 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1604 rx_size += ISCSI_CRC_LEN;
1605 }
1606
1607 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1608
1609 iscsit_unmap_iovec(cmd);
1610
1611 if (rx_got != rx_size)
1612 return -1;
1613
1614 if (conn->conn_ops->DataDigest) {
1615 u32 data_crc;
1616
1617 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1618 be32_to_cpu(hdr->offset),
1619 payload_length, padding,
1620 cmd->pad_bytes);
1621
1622 if (checksum != data_crc) {
1623 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1624 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1625 " does not match computed 0x%08x\n",
1626 hdr->itt, hdr->offset, payload_length,
1627 hdr->datasn, checksum, data_crc);
1628 data_crc_failed = 1;
1629 } else {
1630 pr_debug("Got CRC32C DataDigest 0x%08x for"
1631 " %u bytes of Data Out\n", checksum,
1632 payload_length);
1633 }
1634 }
1635
1636 return data_crc_failed;
1637 }
1638
1639 int
iscsit_check_dataout_payload(struct iscsi_cmd * cmd,struct iscsi_data * hdr,bool data_crc_failed)1640 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1641 bool data_crc_failed)
1642 {
1643 struct iscsi_conn *conn = cmd->conn;
1644 int rc, ooo_cmdsn;
1645 /*
1646 * Increment post receive data and CRC values or perform
1647 * within-command recovery.
1648 */
1649 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1650 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1651 return 0;
1652 else if (rc == DATAOUT_SEND_R2T) {
1653 iscsit_set_dataout_sequence_values(cmd);
1654 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1655 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1656 /*
1657 * Handle extra special case for out of order
1658 * Unsolicited Data Out.
1659 */
1660 spin_lock_bh(&cmd->istate_lock);
1661 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1662 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1663 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1664 spin_unlock_bh(&cmd->istate_lock);
1665
1666 iscsit_stop_dataout_timer(cmd);
1667 if (ooo_cmdsn)
1668 return 0;
1669 target_execute_cmd(&cmd->se_cmd);
1670 return 0;
1671 } else /* DATAOUT_CANNOT_RECOVER */
1672 return -1;
1673
1674 return 0;
1675 }
1676 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1677
iscsit_handle_data_out(struct iscsi_conn * conn,unsigned char * buf)1678 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1679 {
1680 struct iscsi_cmd *cmd = NULL;
1681 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1682 int rc;
1683 bool data_crc_failed = false;
1684
1685 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1686 if (rc < 0)
1687 return 0;
1688 else if (!cmd)
1689 return 0;
1690
1691 rc = iscsit_get_dataout(conn, cmd, hdr);
1692 if (rc < 0)
1693 return rc;
1694 else if (rc > 0)
1695 data_crc_failed = true;
1696
1697 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1698 }
1699
iscsit_setup_nop_out(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_nopout * hdr)1700 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1701 struct iscsi_nopout *hdr)
1702 {
1703 u32 payload_length = ntoh24(hdr->dlength);
1704
1705 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1706 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1707 if (!cmd)
1708 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1709 (unsigned char *)hdr);
1710
1711 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1712 (unsigned char *)hdr);
1713 }
1714
1715 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1716 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1717 " not set, protocol error.\n");
1718 if (!cmd)
1719 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1720 (unsigned char *)hdr);
1721
1722 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1723 (unsigned char *)hdr);
1724 }
1725
1726 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1727 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1728 " greater than MaxXmitDataSegmentLength: %u, protocol"
1729 " error.\n", payload_length,
1730 conn->conn_ops->MaxXmitDataSegmentLength);
1731 if (!cmd)
1732 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1733 (unsigned char *)hdr);
1734
1735 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1736 (unsigned char *)hdr);
1737 }
1738
1739 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1740 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1741 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1742 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1743 payload_length);
1744 /*
1745 * This is not a response to a Unsolicited NopIN, which means
1746 * it can either be a NOPOUT ping request (with a valid ITT),
1747 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1748 * Either way, make sure we allocate an struct iscsi_cmd, as both
1749 * can contain ping data.
1750 */
1751 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1752 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1753 cmd->i_state = ISTATE_SEND_NOPIN;
1754 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1755 1 : 0);
1756 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1757 cmd->targ_xfer_tag = 0xFFFFFFFF;
1758 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1759 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1760 cmd->data_direction = DMA_NONE;
1761 }
1762
1763 return 0;
1764 }
1765 EXPORT_SYMBOL(iscsit_setup_nop_out);
1766
iscsit_process_nop_out(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_nopout * hdr)1767 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1768 struct iscsi_nopout *hdr)
1769 {
1770 struct iscsi_cmd *cmd_p = NULL;
1771 int cmdsn_ret = 0;
1772 /*
1773 * Initiator is expecting a NopIN ping reply..
1774 */
1775 if (hdr->itt != RESERVED_ITT) {
1776 if (!cmd)
1777 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1778 (unsigned char *)hdr);
1779
1780 spin_lock_bh(&conn->cmd_lock);
1781 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1782 spin_unlock_bh(&conn->cmd_lock);
1783
1784 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1785
1786 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1787 iscsit_add_cmd_to_response_queue(cmd, conn,
1788 cmd->i_state);
1789 return 0;
1790 }
1791
1792 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1793 (unsigned char *)hdr, hdr->cmdsn);
1794 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1795 return 0;
1796 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1797 return -1;
1798
1799 return 0;
1800 }
1801 /*
1802 * This was a response to a unsolicited NOPIN ping.
1803 */
1804 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1805 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1806 if (!cmd_p)
1807 return -EINVAL;
1808
1809 iscsit_stop_nopin_response_timer(conn);
1810
1811 cmd_p->i_state = ISTATE_REMOVE;
1812 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1813
1814 iscsit_start_nopin_timer(conn);
1815 return 0;
1816 }
1817 /*
1818 * Otherwise, initiator is not expecting a NOPIN is response.
1819 * Just ignore for now.
1820 */
1821
1822 if (cmd)
1823 iscsit_free_cmd(cmd, false);
1824
1825 return 0;
1826 }
1827 EXPORT_SYMBOL(iscsit_process_nop_out);
1828
iscsit_handle_nop_out(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)1829 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1830 unsigned char *buf)
1831 {
1832 unsigned char *ping_data = NULL;
1833 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1834 struct kvec *iov = NULL;
1835 u32 payload_length = ntoh24(hdr->dlength);
1836 int ret;
1837
1838 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1839 if (ret < 0)
1840 return 0;
1841 /*
1842 * Handle NOP-OUT payload for traditional iSCSI sockets
1843 */
1844 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1845 u32 checksum, data_crc, padding = 0;
1846 int niov = 0, rx_got, rx_size = payload_length;
1847
1848 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1849 if (!ping_data) {
1850 pr_err("Unable to allocate memory for"
1851 " NOPOUT ping data.\n");
1852 ret = -1;
1853 goto out;
1854 }
1855
1856 iov = &cmd->iov_misc[0];
1857 iov[niov].iov_base = ping_data;
1858 iov[niov++].iov_len = payload_length;
1859
1860 padding = ((-payload_length) & 3);
1861 if (padding != 0) {
1862 pr_debug("Receiving %u additional bytes"
1863 " for padding.\n", padding);
1864 iov[niov].iov_base = &cmd->pad_bytes;
1865 iov[niov++].iov_len = padding;
1866 rx_size += padding;
1867 }
1868 if (conn->conn_ops->DataDigest) {
1869 iov[niov].iov_base = &checksum;
1870 iov[niov++].iov_len = ISCSI_CRC_LEN;
1871 rx_size += ISCSI_CRC_LEN;
1872 }
1873
1874 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1875 if (rx_got != rx_size) {
1876 ret = -1;
1877 goto out;
1878 }
1879
1880 if (conn->conn_ops->DataDigest) {
1881 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1882 ping_data, payload_length,
1883 padding, cmd->pad_bytes,
1884 (u8 *)&data_crc);
1885
1886 if (checksum != data_crc) {
1887 pr_err("Ping data CRC32C DataDigest"
1888 " 0x%08x does not match computed 0x%08x\n",
1889 checksum, data_crc);
1890 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1891 pr_err("Unable to recover from"
1892 " NOPOUT Ping DataCRC failure while in"
1893 " ERL=0.\n");
1894 ret = -1;
1895 goto out;
1896 } else {
1897 /*
1898 * Silently drop this PDU and let the
1899 * initiator plug the CmdSN gap.
1900 */
1901 pr_debug("Dropping NOPOUT"
1902 " Command CmdSN: 0x%08x due to"
1903 " DataCRC error.\n", hdr->cmdsn);
1904 ret = 0;
1905 goto out;
1906 }
1907 } else {
1908 pr_debug("Got CRC32C DataDigest"
1909 " 0x%08x for %u bytes of ping data.\n",
1910 checksum, payload_length);
1911 }
1912 }
1913
1914 ping_data[payload_length] = '\0';
1915 /*
1916 * Attach ping data to struct iscsi_cmd->buf_ptr.
1917 */
1918 cmd->buf_ptr = ping_data;
1919 cmd->buf_ptr_size = payload_length;
1920
1921 pr_debug("Got %u bytes of NOPOUT ping"
1922 " data.\n", payload_length);
1923 pr_debug("Ping Data: \"%s\"\n", ping_data);
1924 }
1925
1926 return iscsit_process_nop_out(conn, cmd, hdr);
1927 out:
1928 if (cmd)
1929 iscsit_free_cmd(cmd, false);
1930
1931 kfree(ping_data);
1932 return ret;
1933 }
1934
1935 int
iscsit_handle_task_mgt_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)1936 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1937 unsigned char *buf)
1938 {
1939 struct se_tmr_req *se_tmr;
1940 struct iscsi_tmr_req *tmr_req;
1941 struct iscsi_tm *hdr;
1942 int out_of_order_cmdsn = 0, ret;
1943 u8 function, tcm_function = TMR_UNKNOWN;
1944
1945 hdr = (struct iscsi_tm *) buf;
1946 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1947 function = hdr->flags;
1948
1949 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1950 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1951 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1952 hdr->rtt, hdr->refcmdsn, conn->cid);
1953
1954 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1955 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1956 hdr->rtt != RESERVED_ITT)) {
1957 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1958 hdr->rtt = RESERVED_ITT;
1959 }
1960
1961 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1962 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1963 pr_err("Task Management Request TASK_REASSIGN not"
1964 " issued as immediate command, bad iSCSI Initiator"
1965 "implementation\n");
1966 return iscsit_add_reject_cmd(cmd,
1967 ISCSI_REASON_PROTOCOL_ERROR, buf);
1968 }
1969 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1970 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1971 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1972
1973 cmd->data_direction = DMA_NONE;
1974
1975 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1976 if (!cmd->tmr_req) {
1977 pr_err("Unable to allocate memory for"
1978 " Task Management command!\n");
1979 return iscsit_add_reject_cmd(cmd,
1980 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1981 buf);
1982 }
1983
1984 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1985 conn->sess->se_sess, 0, DMA_NONE,
1986 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1987
1988 target_get_sess_cmd(&cmd->se_cmd, true);
1989
1990 /*
1991 * TASK_REASSIGN for ERL=2 / connection stays inside of
1992 * LIO-Target $FABRIC_MOD
1993 */
1994 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1995 switch (function) {
1996 case ISCSI_TM_FUNC_ABORT_TASK:
1997 tcm_function = TMR_ABORT_TASK;
1998 break;
1999 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2000 tcm_function = TMR_ABORT_TASK_SET;
2001 break;
2002 case ISCSI_TM_FUNC_CLEAR_ACA:
2003 tcm_function = TMR_CLEAR_ACA;
2004 break;
2005 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2006 tcm_function = TMR_CLEAR_TASK_SET;
2007 break;
2008 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2009 tcm_function = TMR_LUN_RESET;
2010 break;
2011 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2012 tcm_function = TMR_TARGET_WARM_RESET;
2013 break;
2014 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2015 tcm_function = TMR_TARGET_COLD_RESET;
2016 break;
2017 default:
2018 pr_err("Unknown iSCSI TMR Function:"
2019 " 0x%02x\n", function);
2020 return iscsit_add_reject_cmd(cmd,
2021 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2022 }
2023 }
2024 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2025 GFP_KERNEL);
2026 if (ret < 0)
2027 return iscsit_add_reject_cmd(cmd,
2028 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2029
2030 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2031
2032 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2033 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2034 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2035 cmd->init_task_tag = hdr->itt;
2036 cmd->targ_xfer_tag = 0xFFFFFFFF;
2037 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2038 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2039 se_tmr = cmd->se_cmd.se_tmr_req;
2040 tmr_req = cmd->tmr_req;
2041 /*
2042 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2043 */
2044 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2045 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2046 scsilun_to_int(&hdr->lun));
2047 if (ret < 0) {
2048 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2049 goto attach;
2050 }
2051 }
2052
2053 switch (function) {
2054 case ISCSI_TM_FUNC_ABORT_TASK:
2055 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2056 if (se_tmr->response)
2057 goto attach;
2058 break;
2059 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2060 case ISCSI_TM_FUNC_CLEAR_ACA:
2061 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2062 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2063 break;
2064 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2065 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2066 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2067 goto attach;
2068 }
2069 break;
2070 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2071 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2072 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2073 goto attach;
2074 }
2075 break;
2076 case ISCSI_TM_FUNC_TASK_REASSIGN:
2077 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2078 /*
2079 * Perform sanity checks on the ExpDataSN only if the
2080 * TASK_REASSIGN was successful.
2081 */
2082 if (se_tmr->response)
2083 break;
2084
2085 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2086 return iscsit_add_reject_cmd(cmd,
2087 ISCSI_REASON_BOOKMARK_INVALID, buf);
2088 break;
2089 default:
2090 pr_err("Unknown TMR function: 0x%02x, protocol"
2091 " error.\n", function);
2092 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2093 goto attach;
2094 }
2095
2096 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2097 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2098 se_tmr->call_transport = 1;
2099 attach:
2100 spin_lock_bh(&conn->cmd_lock);
2101 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2102 spin_unlock_bh(&conn->cmd_lock);
2103
2104 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2105 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2106 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2107 out_of_order_cmdsn = 1;
2108 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2109 target_put_sess_cmd(&cmd->se_cmd);
2110 return 0;
2111 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2112 return -1;
2113 }
2114 }
2115 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2116
2117 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2118 return 0;
2119 /*
2120 * Found the referenced task, send to transport for processing.
2121 */
2122 if (se_tmr->call_transport)
2123 return transport_generic_handle_tmr(&cmd->se_cmd);
2124
2125 /*
2126 * Could not find the referenced LUN, task, or Task Management
2127 * command not authorized or supported. Change state and
2128 * let the tx_thread send the response.
2129 *
2130 * For connection recovery, this is also the default action for
2131 * TMR TASK_REASSIGN.
2132 */
2133 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2134 target_put_sess_cmd(&cmd->se_cmd);
2135 return 0;
2136 }
2137 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2138
2139 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2140 int
iscsit_setup_text_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_text * hdr)2141 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2142 struct iscsi_text *hdr)
2143 {
2144 u32 payload_length = ntoh24(hdr->dlength);
2145
2146 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2147 pr_err("Unable to accept text parameter length: %u"
2148 "greater than MaxXmitDataSegmentLength %u.\n",
2149 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2150 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2151 (unsigned char *)hdr);
2152 }
2153
2154 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2155 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2156 pr_err("Multi sequence text commands currently not supported\n");
2157 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2158 (unsigned char *)hdr);
2159 }
2160
2161 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2162 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2163 hdr->exp_statsn, payload_length);
2164
2165 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2166 cmd->i_state = ISTATE_SEND_TEXTRSP;
2167 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2168 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2169 cmd->targ_xfer_tag = 0xFFFFFFFF;
2170 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2171 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2172 cmd->data_direction = DMA_NONE;
2173 kfree(cmd->text_in_ptr);
2174 cmd->text_in_ptr = NULL;
2175
2176 return 0;
2177 }
2178 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2179
2180 int
iscsit_process_text_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_text * hdr)2181 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2182 struct iscsi_text *hdr)
2183 {
2184 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2185 int cmdsn_ret;
2186
2187 if (!text_in) {
2188 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2189 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2190 pr_err("Unable to locate text_in buffer for sendtargets"
2191 " discovery\n");
2192 goto reject;
2193 }
2194 goto empty_sendtargets;
2195 }
2196 if (strncmp("SendTargets", text_in, 11) != 0) {
2197 pr_err("Received Text Data that is not"
2198 " SendTargets, cannot continue.\n");
2199 goto reject;
2200 }
2201 text_ptr = strchr(text_in, '=');
2202 if (!text_ptr) {
2203 pr_err("No \"=\" separator found in Text Data,"
2204 " cannot continue.\n");
2205 goto reject;
2206 }
2207 if (!strncmp("=All", text_ptr, 4)) {
2208 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2209 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2210 !strncmp("=eui.", text_ptr, 5)) {
2211 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2212 } else {
2213 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2214 goto reject;
2215 }
2216
2217 spin_lock_bh(&conn->cmd_lock);
2218 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2219 spin_unlock_bh(&conn->cmd_lock);
2220
2221 empty_sendtargets:
2222 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2223
2224 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2225 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2226 (unsigned char *)hdr, hdr->cmdsn);
2227 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2228 return -1;
2229
2230 return 0;
2231 }
2232
2233 return iscsit_execute_cmd(cmd, 0);
2234
2235 reject:
2236 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2237 (unsigned char *)hdr);
2238 }
2239 EXPORT_SYMBOL(iscsit_process_text_cmd);
2240
2241 static int
iscsit_handle_text_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)2242 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2243 unsigned char *buf)
2244 {
2245 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2246 char *text_in = NULL;
2247 u32 payload_length = ntoh24(hdr->dlength);
2248 int rx_size, rc;
2249
2250 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2251 if (rc < 0)
2252 return 0;
2253
2254 rx_size = payload_length;
2255 if (payload_length) {
2256 u32 checksum = 0, data_crc = 0;
2257 u32 padding = 0, pad_bytes = 0;
2258 int niov = 0, rx_got;
2259 struct kvec iov[3];
2260
2261 text_in = kzalloc(payload_length, GFP_KERNEL);
2262 if (!text_in) {
2263 pr_err("Unable to allocate memory for"
2264 " incoming text parameters\n");
2265 goto reject;
2266 }
2267 cmd->text_in_ptr = text_in;
2268
2269 memset(iov, 0, 3 * sizeof(struct kvec));
2270 iov[niov].iov_base = text_in;
2271 iov[niov++].iov_len = payload_length;
2272
2273 padding = ((-payload_length) & 3);
2274 if (padding != 0) {
2275 iov[niov].iov_base = &pad_bytes;
2276 iov[niov++].iov_len = padding;
2277 rx_size += padding;
2278 pr_debug("Receiving %u additional bytes"
2279 " for padding.\n", padding);
2280 }
2281 if (conn->conn_ops->DataDigest) {
2282 iov[niov].iov_base = &checksum;
2283 iov[niov++].iov_len = ISCSI_CRC_LEN;
2284 rx_size += ISCSI_CRC_LEN;
2285 }
2286
2287 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2288 if (rx_got != rx_size)
2289 goto reject;
2290
2291 if (conn->conn_ops->DataDigest) {
2292 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2293 text_in, payload_length,
2294 padding, (u8 *)&pad_bytes,
2295 (u8 *)&data_crc);
2296
2297 if (checksum != data_crc) {
2298 pr_err("Text data CRC32C DataDigest"
2299 " 0x%08x does not match computed"
2300 " 0x%08x\n", checksum, data_crc);
2301 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2302 pr_err("Unable to recover from"
2303 " Text Data digest failure while in"
2304 " ERL=0.\n");
2305 goto reject;
2306 } else {
2307 /*
2308 * Silently drop this PDU and let the
2309 * initiator plug the CmdSN gap.
2310 */
2311 pr_debug("Dropping Text"
2312 " Command CmdSN: 0x%08x due to"
2313 " DataCRC error.\n", hdr->cmdsn);
2314 kfree(text_in);
2315 return 0;
2316 }
2317 } else {
2318 pr_debug("Got CRC32C DataDigest"
2319 " 0x%08x for %u bytes of text data.\n",
2320 checksum, payload_length);
2321 }
2322 }
2323 text_in[payload_length - 1] = '\0';
2324 pr_debug("Successfully read %d bytes of text"
2325 " data.\n", payload_length);
2326 }
2327
2328 return iscsit_process_text_cmd(conn, cmd, hdr);
2329
2330 reject:
2331 kfree(cmd->text_in_ptr);
2332 cmd->text_in_ptr = NULL;
2333 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2334 }
2335
iscsit_logout_closesession(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2336 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2337 {
2338 struct iscsi_conn *conn_p;
2339 struct iscsi_session *sess = conn->sess;
2340
2341 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2342 " for SID: %u.\n", conn->cid, conn->sess->sid);
2343
2344 atomic_set(&sess->session_logout, 1);
2345 atomic_set(&conn->conn_logout_remove, 1);
2346 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2347
2348 iscsit_inc_conn_usage_count(conn);
2349 iscsit_inc_session_usage_count(sess);
2350
2351 spin_lock_bh(&sess->conn_lock);
2352 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2353 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2354 continue;
2355
2356 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2357 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2358 }
2359 spin_unlock_bh(&sess->conn_lock);
2360
2361 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2362
2363 return 0;
2364 }
2365
iscsit_logout_closeconnection(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2366 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2367 {
2368 struct iscsi_conn *l_conn;
2369 struct iscsi_session *sess = conn->sess;
2370
2371 pr_debug("Received logout request CLOSECONNECTION for CID:"
2372 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2373
2374 /*
2375 * A Logout Request with a CLOSECONNECTION reason code for a CID
2376 * can arrive on a connection with a differing CID.
2377 */
2378 if (conn->cid == cmd->logout_cid) {
2379 spin_lock_bh(&conn->state_lock);
2380 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2381 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2382
2383 atomic_set(&conn->conn_logout_remove, 1);
2384 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2385 iscsit_inc_conn_usage_count(conn);
2386
2387 spin_unlock_bh(&conn->state_lock);
2388 } else {
2389 /*
2390 * Handle all different cid CLOSECONNECTION requests in
2391 * iscsit_logout_post_handler_diffcid() as to give enough
2392 * time for any non immediate command's CmdSN to be
2393 * acknowledged on the connection in question.
2394 *
2395 * Here we simply make sure the CID is still around.
2396 */
2397 l_conn = iscsit_get_conn_from_cid(sess,
2398 cmd->logout_cid);
2399 if (!l_conn) {
2400 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2401 iscsit_add_cmd_to_response_queue(cmd, conn,
2402 cmd->i_state);
2403 return 0;
2404 }
2405
2406 iscsit_dec_conn_usage_count(l_conn);
2407 }
2408
2409 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2410
2411 return 0;
2412 }
2413
iscsit_logout_removeconnforrecovery(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2414 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2415 {
2416 struct iscsi_session *sess = conn->sess;
2417
2418 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2419 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2420
2421 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2422 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2423 " while ERL!=2.\n");
2424 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2425 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2426 return 0;
2427 }
2428
2429 if (conn->cid == cmd->logout_cid) {
2430 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2431 " with CID: %hu on CID: %hu, implementation error.\n",
2432 cmd->logout_cid, conn->cid);
2433 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2434 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2435 return 0;
2436 }
2437
2438 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2439
2440 return 0;
2441 }
2442
2443 int
iscsit_handle_logout_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)2444 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2445 unsigned char *buf)
2446 {
2447 int cmdsn_ret, logout_remove = 0;
2448 u8 reason_code = 0;
2449 struct iscsi_logout *hdr;
2450 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2451
2452 hdr = (struct iscsi_logout *) buf;
2453 reason_code = (hdr->flags & 0x7f);
2454
2455 if (tiqn) {
2456 spin_lock(&tiqn->logout_stats.lock);
2457 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2458 tiqn->logout_stats.normal_logouts++;
2459 else
2460 tiqn->logout_stats.abnormal_logouts++;
2461 spin_unlock(&tiqn->logout_stats.lock);
2462 }
2463
2464 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2465 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2466 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2467 hdr->cid, conn->cid);
2468
2469 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2470 pr_err("Received logout request on connection that"
2471 " is not in logged in state, ignoring request.\n");
2472 iscsit_free_cmd(cmd, false);
2473 return 0;
2474 }
2475
2476 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2477 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2478 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2479 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2480 cmd->targ_xfer_tag = 0xFFFFFFFF;
2481 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2482 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2483 cmd->logout_cid = be16_to_cpu(hdr->cid);
2484 cmd->logout_reason = reason_code;
2485 cmd->data_direction = DMA_NONE;
2486
2487 /*
2488 * We need to sleep in these cases (by returning 1) until the Logout
2489 * Response gets sent in the tx thread.
2490 */
2491 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2492 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2493 be16_to_cpu(hdr->cid) == conn->cid))
2494 logout_remove = 1;
2495
2496 spin_lock_bh(&conn->cmd_lock);
2497 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2498 spin_unlock_bh(&conn->cmd_lock);
2499
2500 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2501 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2502
2503 /*
2504 * Immediate commands are executed, well, immediately.
2505 * Non-Immediate Logout Commands are executed in CmdSN order.
2506 */
2507 if (cmd->immediate_cmd) {
2508 int ret = iscsit_execute_cmd(cmd, 0);
2509
2510 if (ret < 0)
2511 return ret;
2512 } else {
2513 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2514 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2515 logout_remove = 0;
2516 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2517 return -1;
2518 }
2519
2520 return logout_remove;
2521 }
2522 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2523
iscsit_handle_snack(struct iscsi_conn * conn,unsigned char * buf)2524 int iscsit_handle_snack(
2525 struct iscsi_conn *conn,
2526 unsigned char *buf)
2527 {
2528 struct iscsi_snack *hdr;
2529
2530 hdr = (struct iscsi_snack *) buf;
2531 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2532
2533 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2534 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2535 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2536 hdr->begrun, hdr->runlength, conn->cid);
2537
2538 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2539 pr_err("Initiator sent SNACK request while in"
2540 " ErrorRecoveryLevel=0.\n");
2541 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2542 buf);
2543 }
2544 /*
2545 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2546 * call from inside iscsi_send_recovery_datain_or_r2t().
2547 */
2548 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2549 case 0:
2550 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2551 hdr->itt,
2552 be32_to_cpu(hdr->ttt),
2553 be32_to_cpu(hdr->begrun),
2554 be32_to_cpu(hdr->runlength));
2555 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2556 return iscsit_handle_status_snack(conn, hdr->itt,
2557 be32_to_cpu(hdr->ttt),
2558 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2559 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2560 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2561 be32_to_cpu(hdr->begrun),
2562 be32_to_cpu(hdr->runlength));
2563 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2564 /* FIXME: Support R-Data SNACK */
2565 pr_err("R-Data SNACK Not Supported.\n");
2566 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2567 buf);
2568 default:
2569 pr_err("Unknown SNACK type 0x%02x, protocol"
2570 " error.\n", hdr->flags & 0x0f);
2571 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2572 buf);
2573 }
2574
2575 return 0;
2576 }
2577 EXPORT_SYMBOL(iscsit_handle_snack);
2578
iscsit_rx_thread_wait_for_tcp(struct iscsi_conn * conn)2579 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2580 {
2581 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2582 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2583 wait_for_completion_interruptible_timeout(
2584 &conn->rx_half_close_comp,
2585 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2586 }
2587 }
2588
iscsit_handle_immediate_data(struct iscsi_cmd * cmd,struct iscsi_scsi_req * hdr,u32 length)2589 static int iscsit_handle_immediate_data(
2590 struct iscsi_cmd *cmd,
2591 struct iscsi_scsi_req *hdr,
2592 u32 length)
2593 {
2594 int iov_ret, rx_got = 0, rx_size = 0;
2595 u32 checksum, iov_count = 0, padding = 0;
2596 struct iscsi_conn *conn = cmd->conn;
2597 struct kvec *iov;
2598
2599 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2600 if (iov_ret < 0)
2601 return IMMEDIATE_DATA_CANNOT_RECOVER;
2602
2603 rx_size = length;
2604 iov_count = iov_ret;
2605 iov = &cmd->iov_data[0];
2606
2607 padding = ((-length) & 3);
2608 if (padding != 0) {
2609 iov[iov_count].iov_base = cmd->pad_bytes;
2610 iov[iov_count++].iov_len = padding;
2611 rx_size += padding;
2612 }
2613
2614 if (conn->conn_ops->DataDigest) {
2615 iov[iov_count].iov_base = &checksum;
2616 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2617 rx_size += ISCSI_CRC_LEN;
2618 }
2619
2620 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2621
2622 iscsit_unmap_iovec(cmd);
2623
2624 if (rx_got != rx_size) {
2625 iscsit_rx_thread_wait_for_tcp(conn);
2626 return IMMEDIATE_DATA_CANNOT_RECOVER;
2627 }
2628
2629 if (conn->conn_ops->DataDigest) {
2630 u32 data_crc;
2631
2632 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2633 cmd->write_data_done, length, padding,
2634 cmd->pad_bytes);
2635
2636 if (checksum != data_crc) {
2637 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2638 " does not match computed 0x%08x\n", checksum,
2639 data_crc);
2640
2641 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2642 pr_err("Unable to recover from"
2643 " Immediate Data digest failure while"
2644 " in ERL=0.\n");
2645 iscsit_reject_cmd(cmd,
2646 ISCSI_REASON_DATA_DIGEST_ERROR,
2647 (unsigned char *)hdr);
2648 return IMMEDIATE_DATA_CANNOT_RECOVER;
2649 } else {
2650 iscsit_reject_cmd(cmd,
2651 ISCSI_REASON_DATA_DIGEST_ERROR,
2652 (unsigned char *)hdr);
2653 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2654 }
2655 } else {
2656 pr_debug("Got CRC32C DataDigest 0x%08x for"
2657 " %u bytes of Immediate Data\n", checksum,
2658 length);
2659 }
2660 }
2661
2662 cmd->write_data_done += length;
2663
2664 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2665 spin_lock_bh(&cmd->istate_lock);
2666 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2667 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2668 spin_unlock_bh(&cmd->istate_lock);
2669 }
2670
2671 return IMMEDIATE_DATA_NORMAL_OPERATION;
2672 }
2673
2674 /*
2675 * Called with sess->conn_lock held.
2676 */
2677 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2678 with active network interface */
iscsit_build_conn_drop_async_message(struct iscsi_conn * conn)2679 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2680 {
2681 struct iscsi_cmd *cmd;
2682 struct iscsi_conn *conn_p;
2683 bool found = false;
2684
2685 /*
2686 * Only send a Asynchronous Message on connections whos network
2687 * interface is still functional.
2688 */
2689 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2690 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2691 iscsit_inc_conn_usage_count(conn_p);
2692 found = true;
2693 break;
2694 }
2695 }
2696
2697 if (!found)
2698 return;
2699
2700 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2701 if (!cmd) {
2702 iscsit_dec_conn_usage_count(conn_p);
2703 return;
2704 }
2705
2706 cmd->logout_cid = conn->cid;
2707 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2708 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2709
2710 spin_lock_bh(&conn_p->cmd_lock);
2711 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2712 spin_unlock_bh(&conn_p->cmd_lock);
2713
2714 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2715 iscsit_dec_conn_usage_count(conn_p);
2716 }
2717
iscsit_send_conn_drop_async_message(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2718 static int iscsit_send_conn_drop_async_message(
2719 struct iscsi_cmd *cmd,
2720 struct iscsi_conn *conn)
2721 {
2722 struct iscsi_async *hdr;
2723
2724 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2725
2726 hdr = (struct iscsi_async *) cmd->pdu;
2727 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2728 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2729 cmd->init_task_tag = RESERVED_ITT;
2730 cmd->targ_xfer_tag = 0xFFFFFFFF;
2731 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2732 cmd->stat_sn = conn->stat_sn++;
2733 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2734 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2735 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2736 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2737 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2738 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2739 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2740
2741 pr_debug("Sending Connection Dropped Async Message StatSN:"
2742 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2743 cmd->logout_cid, conn->cid);
2744
2745 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2746 }
2747
iscsit_tx_thread_wait_for_tcp(struct iscsi_conn * conn)2748 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2749 {
2750 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2751 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2752 wait_for_completion_interruptible_timeout(
2753 &conn->tx_half_close_comp,
2754 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2755 }
2756 }
2757
2758 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)2759 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2760 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2761 bool set_statsn)
2762 {
2763 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2764 hdr->flags = datain->flags;
2765 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2766 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2767 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2768 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2769 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2770 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2771 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2772 }
2773 }
2774 hton24(hdr->dlength, datain->length);
2775 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2776 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2777 (struct scsi_lun *)&hdr->lun);
2778 else
2779 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2780
2781 hdr->itt = cmd->init_task_tag;
2782
2783 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2784 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2785 else
2786 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2787 if (set_statsn)
2788 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2789 else
2790 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2791
2792 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2793 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2794 hdr->datasn = cpu_to_be32(datain->data_sn);
2795 hdr->offset = cpu_to_be32(datain->offset);
2796
2797 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2798 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2799 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2800 ntohl(hdr->offset), datain->length, conn->cid);
2801 }
2802 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2803
iscsit_send_datain(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2804 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2805 {
2806 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2807 struct iscsi_datain datain;
2808 struct iscsi_datain_req *dr;
2809 int eodr = 0, ret;
2810 bool set_statsn = false;
2811
2812 memset(&datain, 0, sizeof(struct iscsi_datain));
2813 dr = iscsit_get_datain_values(cmd, &datain);
2814 if (!dr) {
2815 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2816 cmd->init_task_tag);
2817 return -1;
2818 }
2819 /*
2820 * Be paranoid and double check the logic for now.
2821 */
2822 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2823 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2824 " datain.length: %u exceeds cmd->data_length: %u\n",
2825 cmd->init_task_tag, datain.offset, datain.length,
2826 cmd->se_cmd.data_length);
2827 return -1;
2828 }
2829
2830 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2831 /*
2832 * Special case for successfully execution w/ both DATAIN
2833 * and Sense Data.
2834 */
2835 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2836 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2837 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2838 else {
2839 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2840 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2841 iscsit_increment_maxcmdsn(cmd, conn->sess);
2842 cmd->stat_sn = conn->stat_sn++;
2843 set_statsn = true;
2844 } else if (dr->dr_complete ==
2845 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2846 set_statsn = true;
2847 }
2848
2849 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2850
2851 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2852 if (ret < 0)
2853 return ret;
2854
2855 if (dr->dr_complete) {
2856 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2857 2 : 1;
2858 iscsit_free_datain_req(cmd, dr);
2859 }
2860
2861 return eodr;
2862 }
2863
2864 int
iscsit_build_logout_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_logout_rsp * hdr)2865 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2866 struct iscsi_logout_rsp *hdr)
2867 {
2868 struct iscsi_conn *logout_conn = NULL;
2869 struct iscsi_conn_recovery *cr = NULL;
2870 struct iscsi_session *sess = conn->sess;
2871 /*
2872 * The actual shutting down of Sessions and/or Connections
2873 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2874 * is done in scsi_logout_post_handler().
2875 */
2876 switch (cmd->logout_reason) {
2877 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2878 pr_debug("iSCSI session logout successful, setting"
2879 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2880 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2881 break;
2882 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2883 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2884 break;
2885 /*
2886 * For CLOSECONNECTION logout requests carrying
2887 * a matching logout CID -> local CID, the reference
2888 * for the local CID will have been incremented in
2889 * iscsi_logout_closeconnection().
2890 *
2891 * For CLOSECONNECTION logout requests carrying
2892 * a different CID than the connection it arrived
2893 * on, the connection responding to cmd->logout_cid
2894 * is stopped in iscsit_logout_post_handler_diffcid().
2895 */
2896
2897 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2898 " successful.\n", cmd->logout_cid, conn->cid);
2899 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2900 break;
2901 case ISCSI_LOGOUT_REASON_RECOVERY:
2902 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2903 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2904 break;
2905 /*
2906 * If the connection is still active from our point of view
2907 * force connection recovery to occur.
2908 */
2909 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2910 cmd->logout_cid);
2911 if (logout_conn) {
2912 iscsit_connection_reinstatement_rcfr(logout_conn);
2913 iscsit_dec_conn_usage_count(logout_conn);
2914 }
2915
2916 cr = iscsit_get_inactive_connection_recovery_entry(
2917 conn->sess, cmd->logout_cid);
2918 if (!cr) {
2919 pr_err("Unable to locate CID: %hu for"
2920 " REMOVECONNFORRECOVERY Logout Request.\n",
2921 cmd->logout_cid);
2922 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2923 break;
2924 }
2925
2926 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2927
2928 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2929 " for recovery for CID: %hu on CID: %hu successful.\n",
2930 cmd->logout_cid, conn->cid);
2931 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2932 break;
2933 default:
2934 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2935 cmd->logout_reason);
2936 return -1;
2937 }
2938
2939 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2940 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2941 hdr->response = cmd->logout_response;
2942 hdr->itt = cmd->init_task_tag;
2943 cmd->stat_sn = conn->stat_sn++;
2944 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2945
2946 iscsit_increment_maxcmdsn(cmd, conn->sess);
2947 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2948 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2949
2950 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2951 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2952 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2953 cmd->logout_cid, conn->cid);
2954
2955 return 0;
2956 }
2957 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2958
2959 static int
iscsit_send_logout(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2960 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2961 {
2962 int rc;
2963
2964 rc = iscsit_build_logout_rsp(cmd, conn,
2965 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2966 if (rc < 0)
2967 return rc;
2968
2969 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2970 }
2971
2972 void
iscsit_build_nopin_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_nopin * hdr,bool nopout_response)2973 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2974 struct iscsi_nopin *hdr, bool nopout_response)
2975 {
2976 hdr->opcode = ISCSI_OP_NOOP_IN;
2977 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2978 hton24(hdr->dlength, cmd->buf_ptr_size);
2979 if (nopout_response)
2980 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2981 hdr->itt = cmd->init_task_tag;
2982 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2983 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2984 conn->stat_sn;
2985 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2986
2987 if (nopout_response)
2988 iscsit_increment_maxcmdsn(cmd, conn->sess);
2989
2990 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2991 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2992
2993 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2994 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2995 "Solicited" : "Unsolicited", cmd->init_task_tag,
2996 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2997 }
2998 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2999
3000 /*
3001 * Unsolicited NOPIN, either requesting a response or not.
3002 */
iscsit_send_unsolicited_nopin(struct iscsi_cmd * cmd,struct iscsi_conn * conn,int want_response)3003 static int iscsit_send_unsolicited_nopin(
3004 struct iscsi_cmd *cmd,
3005 struct iscsi_conn *conn,
3006 int want_response)
3007 {
3008 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3009 int ret;
3010
3011 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3012
3013 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3014 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3015
3016 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3017 if (ret < 0)
3018 return ret;
3019
3020 spin_lock_bh(&cmd->istate_lock);
3021 cmd->i_state = want_response ?
3022 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3023 spin_unlock_bh(&cmd->istate_lock);
3024
3025 return 0;
3026 }
3027
3028 static int
iscsit_send_nopin(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3029 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3030 {
3031 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3032
3033 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3034
3035 /*
3036 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3037 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3038 */
3039 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3040
3041 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3042 cmd->buf_ptr,
3043 cmd->buf_ptr_size);
3044 }
3045
iscsit_send_r2t(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3046 static int iscsit_send_r2t(
3047 struct iscsi_cmd *cmd,
3048 struct iscsi_conn *conn)
3049 {
3050 struct iscsi_r2t *r2t;
3051 struct iscsi_r2t_rsp *hdr;
3052 int ret;
3053
3054 r2t = iscsit_get_r2t_from_list(cmd);
3055 if (!r2t)
3056 return -1;
3057
3058 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3059 memset(hdr, 0, ISCSI_HDR_LEN);
3060 hdr->opcode = ISCSI_OP_R2T;
3061 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3062 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3063 (struct scsi_lun *)&hdr->lun);
3064 hdr->itt = cmd->init_task_tag;
3065 if (conn->conn_transport->iscsit_get_r2t_ttt)
3066 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3067 else
3068 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3069 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3070 hdr->statsn = cpu_to_be32(conn->stat_sn);
3071 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3072 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3073 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3074 hdr->data_offset = cpu_to_be32(r2t->offset);
3075 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3076
3077 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3078 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3079 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3080 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3081 r2t->offset, r2t->xfer_len, conn->cid);
3082
3083 spin_lock_bh(&cmd->r2t_lock);
3084 r2t->sent_r2t = 1;
3085 spin_unlock_bh(&cmd->r2t_lock);
3086
3087 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3088 if (ret < 0) {
3089 return ret;
3090 }
3091
3092 spin_lock_bh(&cmd->dataout_timeout_lock);
3093 iscsit_start_dataout_timer(cmd, conn);
3094 spin_unlock_bh(&cmd->dataout_timeout_lock);
3095
3096 return 0;
3097 }
3098
3099 /*
3100 * @recovery: If called from iscsi_task_reassign_complete_write() for
3101 * connection recovery.
3102 */
iscsit_build_r2ts_for_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,bool recovery)3103 int iscsit_build_r2ts_for_cmd(
3104 struct iscsi_conn *conn,
3105 struct iscsi_cmd *cmd,
3106 bool recovery)
3107 {
3108 int first_r2t = 1;
3109 u32 offset = 0, xfer_len = 0;
3110
3111 spin_lock_bh(&cmd->r2t_lock);
3112 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3113 spin_unlock_bh(&cmd->r2t_lock);
3114 return 0;
3115 }
3116
3117 if (conn->sess->sess_ops->DataSequenceInOrder &&
3118 !recovery)
3119 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3120
3121 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3122 if (conn->sess->sess_ops->DataSequenceInOrder) {
3123 offset = cmd->r2t_offset;
3124
3125 if (first_r2t && recovery) {
3126 int new_data_end = offset +
3127 conn->sess->sess_ops->MaxBurstLength -
3128 cmd->next_burst_len;
3129
3130 if (new_data_end > cmd->se_cmd.data_length)
3131 xfer_len = cmd->se_cmd.data_length - offset;
3132 else
3133 xfer_len =
3134 conn->sess->sess_ops->MaxBurstLength -
3135 cmd->next_burst_len;
3136 } else {
3137 int new_data_end = offset +
3138 conn->sess->sess_ops->MaxBurstLength;
3139
3140 if (new_data_end > cmd->se_cmd.data_length)
3141 xfer_len = cmd->se_cmd.data_length - offset;
3142 else
3143 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3144 }
3145 cmd->r2t_offset += xfer_len;
3146
3147 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3148 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3149 } else {
3150 struct iscsi_seq *seq;
3151
3152 seq = iscsit_get_seq_holder_for_r2t(cmd);
3153 if (!seq) {
3154 spin_unlock_bh(&cmd->r2t_lock);
3155 return -1;
3156 }
3157
3158 offset = seq->offset;
3159 xfer_len = seq->xfer_len;
3160
3161 if (cmd->seq_send_order == cmd->seq_count)
3162 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3163 }
3164 cmd->outstanding_r2ts++;
3165 first_r2t = 0;
3166
3167 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3168 spin_unlock_bh(&cmd->r2t_lock);
3169 return -1;
3170 }
3171
3172 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3173 break;
3174 }
3175 spin_unlock_bh(&cmd->r2t_lock);
3176
3177 return 0;
3178 }
3179 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3180
iscsit_build_rsp_pdu(struct iscsi_cmd * cmd,struct iscsi_conn * conn,bool inc_stat_sn,struct iscsi_scsi_rsp * hdr)3181 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3182 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3183 {
3184 if (inc_stat_sn)
3185 cmd->stat_sn = conn->stat_sn++;
3186
3187 atomic_long_inc(&conn->sess->rsp_pdus);
3188
3189 memset(hdr, 0, ISCSI_HDR_LEN);
3190 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3191 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3192 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3193 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3194 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3195 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3196 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3197 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3198 }
3199 hdr->response = cmd->iscsi_response;
3200 hdr->cmd_status = cmd->se_cmd.scsi_status;
3201 hdr->itt = cmd->init_task_tag;
3202 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3203
3204 iscsit_increment_maxcmdsn(cmd, conn->sess);
3205 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3206 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3207
3208 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3209 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3210 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3211 cmd->se_cmd.scsi_status, conn->cid);
3212 }
3213 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3214
iscsit_send_response(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3215 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3216 {
3217 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3218 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3219 void *data_buf = NULL;
3220 u32 padding = 0, data_buf_len = 0;
3221
3222 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3223
3224 /*
3225 * Attach SENSE DATA payload to iSCSI Response PDU
3226 */
3227 if (cmd->se_cmd.sense_buffer &&
3228 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3229 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3230 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3231 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3232
3233 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3234 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3235 data_buf = cmd->sense_buffer;
3236 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3237
3238 if (padding) {
3239 memset(cmd->sense_buffer +
3240 cmd->se_cmd.scsi_sense_length, 0, padding);
3241 pr_debug("Adding %u bytes of padding to"
3242 " SENSE.\n", padding);
3243 }
3244
3245 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3246 " Response PDU\n",
3247 cmd->se_cmd.scsi_sense_length);
3248 }
3249
3250 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3251 data_buf_len);
3252 }
3253
iscsit_convert_tcm_tmr_rsp(struct se_tmr_req * se_tmr)3254 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3255 {
3256 switch (se_tmr->response) {
3257 case TMR_FUNCTION_COMPLETE:
3258 return ISCSI_TMF_RSP_COMPLETE;
3259 case TMR_TASK_DOES_NOT_EXIST:
3260 return ISCSI_TMF_RSP_NO_TASK;
3261 case TMR_LUN_DOES_NOT_EXIST:
3262 return ISCSI_TMF_RSP_NO_LUN;
3263 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3264 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3265 case TMR_FUNCTION_REJECTED:
3266 default:
3267 return ISCSI_TMF_RSP_REJECTED;
3268 }
3269 }
3270
3271 void
iscsit_build_task_mgt_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_tm_rsp * hdr)3272 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3273 struct iscsi_tm_rsp *hdr)
3274 {
3275 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3276
3277 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3278 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3279 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3280 hdr->itt = cmd->init_task_tag;
3281 cmd->stat_sn = conn->stat_sn++;
3282 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3283
3284 iscsit_increment_maxcmdsn(cmd, conn->sess);
3285 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3286 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3287
3288 pr_debug("Built Task Management Response ITT: 0x%08x,"
3289 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3290 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3291 }
3292 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3293
3294 static int
iscsit_send_task_mgt_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3295 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3296 {
3297 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3298
3299 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3300
3301 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3302 }
3303
iscsit_check_inaddr_any(struct iscsi_np * np)3304 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3305 {
3306 bool ret = false;
3307
3308 if (np->np_sockaddr.ss_family == AF_INET6) {
3309 const struct sockaddr_in6 sin6 = {
3310 .sin6_addr = IN6ADDR_ANY_INIT };
3311 struct sockaddr_in6 *sock_in6 =
3312 (struct sockaddr_in6 *)&np->np_sockaddr;
3313
3314 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3315 sin6.sin6_addr.s6_addr, 16))
3316 ret = true;
3317 } else {
3318 struct sockaddr_in * sock_in =
3319 (struct sockaddr_in *)&np->np_sockaddr;
3320
3321 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3322 ret = true;
3323 }
3324
3325 return ret;
3326 }
3327
3328 #define SENDTARGETS_BUF_LIMIT 32768U
3329
3330 static int
iscsit_build_sendtargets_response(struct iscsi_cmd * cmd,enum iscsit_transport_type network_transport,int skip_bytes,bool * completed)3331 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3332 enum iscsit_transport_type network_transport,
3333 int skip_bytes, bool *completed)
3334 {
3335 char *payload = NULL;
3336 struct iscsi_conn *conn = cmd->conn;
3337 struct iscsi_portal_group *tpg;
3338 struct iscsi_tiqn *tiqn;
3339 struct iscsi_tpg_np *tpg_np;
3340 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3341 int target_name_printed;
3342 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3343 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3344 bool active;
3345
3346 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3347 SENDTARGETS_BUF_LIMIT);
3348
3349 payload = kzalloc(buffer_len, GFP_KERNEL);
3350 if (!payload) {
3351 pr_err("Unable to allocate memory for sendtargets"
3352 " response.\n");
3353 return -ENOMEM;
3354 }
3355 /*
3356 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3357 * explicit case..
3358 */
3359 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3360 text_ptr = strchr(text_in, '=');
3361 if (!text_ptr) {
3362 pr_err("Unable to locate '=' string in text_in:"
3363 " %s\n", text_in);
3364 kfree(payload);
3365 return -EINVAL;
3366 }
3367 /*
3368 * Skip over '=' character..
3369 */
3370 text_ptr += 1;
3371 }
3372
3373 spin_lock(&tiqn_lock);
3374 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3375 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3376 strcmp(tiqn->tiqn, text_ptr)) {
3377 continue;
3378 }
3379
3380 target_name_printed = 0;
3381
3382 spin_lock(&tiqn->tiqn_tpg_lock);
3383 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3384
3385 /* If demo_mode_discovery=0 and generate_node_acls=0
3386 * (demo mode dislabed) do not return
3387 * TargetName+TargetAddress unless a NodeACL exists.
3388 */
3389
3390 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3391 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3392 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3393 cmd->conn->sess->sess_ops->InitiatorName))) {
3394 continue;
3395 }
3396
3397 spin_lock(&tpg->tpg_state_lock);
3398 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3399 spin_unlock(&tpg->tpg_state_lock);
3400
3401 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3402 continue;
3403
3404 spin_lock(&tpg->tpg_np_lock);
3405 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3406 tpg_np_list) {
3407 struct iscsi_np *np = tpg_np->tpg_np;
3408 bool inaddr_any = iscsit_check_inaddr_any(np);
3409 struct sockaddr_storage *sockaddr;
3410
3411 if (np->np_network_transport != network_transport)
3412 continue;
3413
3414 if (!target_name_printed) {
3415 len = sprintf(buf, "TargetName=%s",
3416 tiqn->tiqn);
3417 len += 1;
3418
3419 if ((len + payload_len) > buffer_len) {
3420 spin_unlock(&tpg->tpg_np_lock);
3421 spin_unlock(&tiqn->tiqn_tpg_lock);
3422 end_of_buf = 1;
3423 goto eob;
3424 }
3425
3426 if (skip_bytes && len <= skip_bytes) {
3427 skip_bytes -= len;
3428 } else {
3429 memcpy(payload + payload_len, buf, len);
3430 payload_len += len;
3431 target_name_printed = 1;
3432 if (len > skip_bytes)
3433 skip_bytes = 0;
3434 }
3435 }
3436
3437 if (inaddr_any)
3438 sockaddr = &conn->local_sockaddr;
3439 else
3440 sockaddr = &np->np_sockaddr;
3441
3442 len = sprintf(buf, "TargetAddress="
3443 "%pISpc,%hu",
3444 sockaddr,
3445 tpg->tpgt);
3446 len += 1;
3447
3448 if ((len + payload_len) > buffer_len) {
3449 spin_unlock(&tpg->tpg_np_lock);
3450 spin_unlock(&tiqn->tiqn_tpg_lock);
3451 end_of_buf = 1;
3452 goto eob;
3453 }
3454
3455 if (skip_bytes && len <= skip_bytes) {
3456 skip_bytes -= len;
3457 } else {
3458 memcpy(payload + payload_len, buf, len);
3459 payload_len += len;
3460 if (len > skip_bytes)
3461 skip_bytes = 0;
3462 }
3463 }
3464 spin_unlock(&tpg->tpg_np_lock);
3465 }
3466 spin_unlock(&tiqn->tiqn_tpg_lock);
3467 eob:
3468 if (end_of_buf) {
3469 *completed = false;
3470 break;
3471 }
3472
3473 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3474 break;
3475 }
3476 spin_unlock(&tiqn_lock);
3477
3478 cmd->buf_ptr = payload;
3479
3480 return payload_len;
3481 }
3482
3483 int
iscsit_build_text_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_text_rsp * hdr,enum iscsit_transport_type network_transport)3484 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3485 struct iscsi_text_rsp *hdr,
3486 enum iscsit_transport_type network_transport)
3487 {
3488 int text_length, padding;
3489 bool completed = true;
3490
3491 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3492 cmd->read_data_done,
3493 &completed);
3494 if (text_length < 0)
3495 return text_length;
3496
3497 if (completed) {
3498 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3499 } else {
3500 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3501 cmd->read_data_done += text_length;
3502 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3503 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3504 }
3505 hdr->opcode = ISCSI_OP_TEXT_RSP;
3506 padding = ((-text_length) & 3);
3507 hton24(hdr->dlength, text_length);
3508 hdr->itt = cmd->init_task_tag;
3509 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3510 cmd->stat_sn = conn->stat_sn++;
3511 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3512
3513 iscsit_increment_maxcmdsn(cmd, conn->sess);
3514 /*
3515 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3516 * correctly increment MaxCmdSN for each response answering a
3517 * non immediate text request with a valid CmdSN.
3518 */
3519 cmd->maxcmdsn_inc = 0;
3520 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3521 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3522
3523 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3524 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3525 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3526 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3527 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3528
3529 return text_length + padding;
3530 }
3531 EXPORT_SYMBOL(iscsit_build_text_rsp);
3532
iscsit_send_text_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3533 static int iscsit_send_text_rsp(
3534 struct iscsi_cmd *cmd,
3535 struct iscsi_conn *conn)
3536 {
3537 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3538 int text_length;
3539
3540 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3541 conn->conn_transport->transport_type);
3542 if (text_length < 0)
3543 return text_length;
3544
3545 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3546 cmd->buf_ptr,
3547 text_length);
3548 }
3549
3550 void
iscsit_build_reject(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_reject * hdr)3551 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3552 struct iscsi_reject *hdr)
3553 {
3554 hdr->opcode = ISCSI_OP_REJECT;
3555 hdr->reason = cmd->reject_reason;
3556 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3557 hton24(hdr->dlength, ISCSI_HDR_LEN);
3558 hdr->ffffffff = cpu_to_be32(0xffffffff);
3559 cmd->stat_sn = conn->stat_sn++;
3560 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3561 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3562 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3563
3564 }
3565 EXPORT_SYMBOL(iscsit_build_reject);
3566
iscsit_send_reject(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3567 static int iscsit_send_reject(
3568 struct iscsi_cmd *cmd,
3569 struct iscsi_conn *conn)
3570 {
3571 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3572
3573 iscsit_build_reject(cmd, conn, hdr);
3574
3575 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3576 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3577
3578 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3579 cmd->buf_ptr,
3580 ISCSI_HDR_LEN);
3581 }
3582
iscsit_thread_get_cpumask(struct iscsi_conn * conn)3583 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3584 {
3585 int ord, cpu;
3586 /*
3587 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3588 * within iscsit_start_kthreads()
3589 *
3590 * Here we use bitmap_id to determine which CPU that this
3591 * iSCSI connection's RX/TX threads will be scheduled to
3592 * execute upon.
3593 */
3594 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3595 for_each_online_cpu(cpu) {
3596 if (ord-- == 0) {
3597 cpumask_set_cpu(cpu, conn->conn_cpumask);
3598 return;
3599 }
3600 }
3601 /*
3602 * This should never be reached..
3603 */
3604 dump_stack();
3605 cpumask_setall(conn->conn_cpumask);
3606 }
3607
3608 int
iscsit_immediate_queue(struct iscsi_conn * conn,struct iscsi_cmd * cmd,int state)3609 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3610 {
3611 int ret;
3612
3613 switch (state) {
3614 case ISTATE_SEND_R2T:
3615 ret = iscsit_send_r2t(cmd, conn);
3616 if (ret < 0)
3617 goto err;
3618 break;
3619 case ISTATE_REMOVE:
3620 spin_lock_bh(&conn->cmd_lock);
3621 list_del_init(&cmd->i_conn_node);
3622 spin_unlock_bh(&conn->cmd_lock);
3623
3624 iscsit_free_cmd(cmd, false);
3625 break;
3626 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3627 iscsit_mod_nopin_response_timer(conn);
3628 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3629 if (ret < 0)
3630 goto err;
3631 break;
3632 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3633 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3634 if (ret < 0)
3635 goto err;
3636 break;
3637 default:
3638 pr_err("Unknown Opcode: 0x%02x ITT:"
3639 " 0x%08x, i_state: %d on CID: %hu\n",
3640 cmd->iscsi_opcode, cmd->init_task_tag, state,
3641 conn->cid);
3642 goto err;
3643 }
3644
3645 return 0;
3646
3647 err:
3648 return -1;
3649 }
3650 EXPORT_SYMBOL(iscsit_immediate_queue);
3651
3652 static int
iscsit_handle_immediate_queue(struct iscsi_conn * conn)3653 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3654 {
3655 struct iscsit_transport *t = conn->conn_transport;
3656 struct iscsi_queue_req *qr;
3657 struct iscsi_cmd *cmd;
3658 u8 state;
3659 int ret;
3660
3661 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3662 atomic_set(&conn->check_immediate_queue, 0);
3663 cmd = qr->cmd;
3664 state = qr->state;
3665 kmem_cache_free(lio_qr_cache, qr);
3666
3667 ret = t->iscsit_immediate_queue(conn, cmd, state);
3668 if (ret < 0)
3669 return ret;
3670 }
3671
3672 return 0;
3673 }
3674
3675 int
iscsit_response_queue(struct iscsi_conn * conn,struct iscsi_cmd * cmd,int state)3676 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3677 {
3678 int ret;
3679
3680 check_rsp_state:
3681 switch (state) {
3682 case ISTATE_SEND_DATAIN:
3683 ret = iscsit_send_datain(cmd, conn);
3684 if (ret < 0)
3685 goto err;
3686 else if (!ret)
3687 /* more drs */
3688 goto check_rsp_state;
3689 else if (ret == 1) {
3690 /* all done */
3691 spin_lock_bh(&cmd->istate_lock);
3692 cmd->i_state = ISTATE_SENT_STATUS;
3693 spin_unlock_bh(&cmd->istate_lock);
3694
3695 if (atomic_read(&conn->check_immediate_queue))
3696 return 1;
3697
3698 return 0;
3699 } else if (ret == 2) {
3700 /* Still must send status,
3701 SCF_TRANSPORT_TASK_SENSE was set */
3702 spin_lock_bh(&cmd->istate_lock);
3703 cmd->i_state = ISTATE_SEND_STATUS;
3704 spin_unlock_bh(&cmd->istate_lock);
3705 state = ISTATE_SEND_STATUS;
3706 goto check_rsp_state;
3707 }
3708
3709 break;
3710 case ISTATE_SEND_STATUS:
3711 case ISTATE_SEND_STATUS_RECOVERY:
3712 ret = iscsit_send_response(cmd, conn);
3713 break;
3714 case ISTATE_SEND_LOGOUTRSP:
3715 ret = iscsit_send_logout(cmd, conn);
3716 break;
3717 case ISTATE_SEND_ASYNCMSG:
3718 ret = iscsit_send_conn_drop_async_message(
3719 cmd, conn);
3720 break;
3721 case ISTATE_SEND_NOPIN:
3722 ret = iscsit_send_nopin(cmd, conn);
3723 break;
3724 case ISTATE_SEND_REJECT:
3725 ret = iscsit_send_reject(cmd, conn);
3726 break;
3727 case ISTATE_SEND_TASKMGTRSP:
3728 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3729 if (ret != 0)
3730 break;
3731 ret = iscsit_tmr_post_handler(cmd, conn);
3732 if (ret != 0)
3733 iscsit_fall_back_to_erl0(conn->sess);
3734 break;
3735 case ISTATE_SEND_TEXTRSP:
3736 ret = iscsit_send_text_rsp(cmd, conn);
3737 break;
3738 default:
3739 pr_err("Unknown Opcode: 0x%02x ITT:"
3740 " 0x%08x, i_state: %d on CID: %hu\n",
3741 cmd->iscsi_opcode, cmd->init_task_tag,
3742 state, conn->cid);
3743 goto err;
3744 }
3745 if (ret < 0)
3746 goto err;
3747
3748 switch (state) {
3749 case ISTATE_SEND_LOGOUTRSP:
3750 if (!iscsit_logout_post_handler(cmd, conn))
3751 return -ECONNRESET;
3752 /* fall through */
3753 case ISTATE_SEND_STATUS:
3754 case ISTATE_SEND_ASYNCMSG:
3755 case ISTATE_SEND_NOPIN:
3756 case ISTATE_SEND_STATUS_RECOVERY:
3757 case ISTATE_SEND_TEXTRSP:
3758 case ISTATE_SEND_TASKMGTRSP:
3759 case ISTATE_SEND_REJECT:
3760 spin_lock_bh(&cmd->istate_lock);
3761 cmd->i_state = ISTATE_SENT_STATUS;
3762 spin_unlock_bh(&cmd->istate_lock);
3763 break;
3764 default:
3765 pr_err("Unknown Opcode: 0x%02x ITT:"
3766 " 0x%08x, i_state: %d on CID: %hu\n",
3767 cmd->iscsi_opcode, cmd->init_task_tag,
3768 cmd->i_state, conn->cid);
3769 goto err;
3770 }
3771
3772 if (atomic_read(&conn->check_immediate_queue))
3773 return 1;
3774
3775 return 0;
3776
3777 err:
3778 return -1;
3779 }
3780 EXPORT_SYMBOL(iscsit_response_queue);
3781
iscsit_handle_response_queue(struct iscsi_conn * conn)3782 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3783 {
3784 struct iscsit_transport *t = conn->conn_transport;
3785 struct iscsi_queue_req *qr;
3786 struct iscsi_cmd *cmd;
3787 u8 state;
3788 int ret;
3789
3790 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3791 cmd = qr->cmd;
3792 state = qr->state;
3793 kmem_cache_free(lio_qr_cache, qr);
3794
3795 ret = t->iscsit_response_queue(conn, cmd, state);
3796 if (ret == 1 || ret < 0)
3797 return ret;
3798 }
3799
3800 return 0;
3801 }
3802
iscsi_target_tx_thread(void * arg)3803 int iscsi_target_tx_thread(void *arg)
3804 {
3805 int ret = 0;
3806 struct iscsi_conn *conn = arg;
3807 bool conn_freed = false;
3808
3809 /*
3810 * Allow ourselves to be interrupted by SIGINT so that a
3811 * connection recovery / failure event can be triggered externally.
3812 */
3813 allow_signal(SIGINT);
3814
3815 while (!kthread_should_stop()) {
3816 /*
3817 * Ensure that both TX and RX per connection kthreads
3818 * are scheduled to run on the same CPU.
3819 */
3820 iscsit_thread_check_cpumask(conn, current, 1);
3821
3822 wait_event_interruptible(conn->queues_wq,
3823 !iscsit_conn_all_queues_empty(conn));
3824
3825 if (signal_pending(current))
3826 goto transport_err;
3827
3828 get_immediate:
3829 ret = iscsit_handle_immediate_queue(conn);
3830 if (ret < 0)
3831 goto transport_err;
3832
3833 ret = iscsit_handle_response_queue(conn);
3834 if (ret == 1) {
3835 goto get_immediate;
3836 } else if (ret == -ECONNRESET) {
3837 conn_freed = true;
3838 goto out;
3839 } else if (ret < 0) {
3840 goto transport_err;
3841 }
3842 }
3843
3844 transport_err:
3845 /*
3846 * Avoid the normal connection failure code-path if this connection
3847 * is still within LOGIN mode, and iscsi_np process context is
3848 * responsible for cleaning up the early connection failure.
3849 */
3850 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3851 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3852 out:
3853 if (!conn_freed) {
3854 while (!kthread_should_stop()) {
3855 msleep(100);
3856 }
3857 }
3858 return 0;
3859 }
3860
iscsi_target_rx_opcode(struct iscsi_conn * conn,unsigned char * buf)3861 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3862 {
3863 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3864 struct iscsi_cmd *cmd;
3865 int ret = 0;
3866
3867 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3868 case ISCSI_OP_SCSI_CMD:
3869 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3870 if (!cmd)
3871 goto reject;
3872
3873 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3874 break;
3875 case ISCSI_OP_SCSI_DATA_OUT:
3876 ret = iscsit_handle_data_out(conn, buf);
3877 break;
3878 case ISCSI_OP_NOOP_OUT:
3879 cmd = NULL;
3880 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3881 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3882 if (!cmd)
3883 goto reject;
3884 }
3885 ret = iscsit_handle_nop_out(conn, cmd, buf);
3886 break;
3887 case ISCSI_OP_SCSI_TMFUNC:
3888 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3889 if (!cmd)
3890 goto reject;
3891
3892 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3893 break;
3894 case ISCSI_OP_TEXT:
3895 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3896 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3897 if (!cmd)
3898 goto reject;
3899 } else {
3900 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3901 if (!cmd)
3902 goto reject;
3903 }
3904
3905 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3906 break;
3907 case ISCSI_OP_LOGOUT:
3908 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3909 if (!cmd)
3910 goto reject;
3911
3912 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3913 if (ret > 0)
3914 wait_for_completion_timeout(&conn->conn_logout_comp,
3915 SECONDS_FOR_LOGOUT_COMP * HZ);
3916 break;
3917 case ISCSI_OP_SNACK:
3918 ret = iscsit_handle_snack(conn, buf);
3919 break;
3920 default:
3921 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3922 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3923 pr_err("Cannot recover from unknown"
3924 " opcode while ERL=0, closing iSCSI connection.\n");
3925 return -1;
3926 }
3927 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3928 " closing iSCSI connection.\n");
3929 ret = -1;
3930 break;
3931 }
3932
3933 return ret;
3934 reject:
3935 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3936 }
3937
iscsi_target_check_conn_state(struct iscsi_conn * conn)3938 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3939 {
3940 bool ret;
3941
3942 spin_lock_bh(&conn->state_lock);
3943 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3944 spin_unlock_bh(&conn->state_lock);
3945
3946 return ret;
3947 }
3948
iscsit_get_rx_pdu(struct iscsi_conn * conn)3949 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3950 {
3951 int ret;
3952 u8 buffer[ISCSI_HDR_LEN], opcode;
3953 u32 checksum = 0, digest = 0;
3954 struct kvec iov;
3955
3956 while (!kthread_should_stop()) {
3957 /*
3958 * Ensure that both TX and RX per connection kthreads
3959 * are scheduled to run on the same CPU.
3960 */
3961 iscsit_thread_check_cpumask(conn, current, 0);
3962
3963 memset(buffer, 0, ISCSI_HDR_LEN);
3964 memset(&iov, 0, sizeof(struct kvec));
3965
3966 iov.iov_base = buffer;
3967 iov.iov_len = ISCSI_HDR_LEN;
3968
3969 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3970 if (ret != ISCSI_HDR_LEN) {
3971 iscsit_rx_thread_wait_for_tcp(conn);
3972 return;
3973 }
3974
3975 if (conn->conn_ops->HeaderDigest) {
3976 iov.iov_base = &digest;
3977 iov.iov_len = ISCSI_CRC_LEN;
3978
3979 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3980 if (ret != ISCSI_CRC_LEN) {
3981 iscsit_rx_thread_wait_for_tcp(conn);
3982 return;
3983 }
3984
3985 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3986 buffer, ISCSI_HDR_LEN,
3987 0, NULL, (u8 *)&checksum);
3988
3989 if (digest != checksum) {
3990 pr_err("HeaderDigest CRC32C failed,"
3991 " received 0x%08x, computed 0x%08x\n",
3992 digest, checksum);
3993 /*
3994 * Set the PDU to 0xff so it will intentionally
3995 * hit default in the switch below.
3996 */
3997 memset(buffer, 0xff, ISCSI_HDR_LEN);
3998 atomic_long_inc(&conn->sess->conn_digest_errors);
3999 } else {
4000 pr_debug("Got HeaderDigest CRC32C"
4001 " 0x%08x\n", checksum);
4002 }
4003 }
4004
4005 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4006 return;
4007
4008 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4009
4010 if (conn->sess->sess_ops->SessionType &&
4011 ((!(opcode & ISCSI_OP_TEXT)) ||
4012 (!(opcode & ISCSI_OP_LOGOUT)))) {
4013 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4014 " while in Discovery Session, rejecting.\n", opcode);
4015 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4016 buffer);
4017 return;
4018 }
4019
4020 ret = iscsi_target_rx_opcode(conn, buffer);
4021 if (ret < 0)
4022 return;
4023 }
4024 }
4025
iscsi_target_rx_thread(void * arg)4026 int iscsi_target_rx_thread(void *arg)
4027 {
4028 int rc;
4029 struct iscsi_conn *conn = arg;
4030 bool conn_freed = false;
4031
4032 /*
4033 * Allow ourselves to be interrupted by SIGINT so that a
4034 * connection recovery / failure event can be triggered externally.
4035 */
4036 allow_signal(SIGINT);
4037 /*
4038 * Wait for iscsi_post_login_handler() to complete before allowing
4039 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4040 */
4041 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4042 if (rc < 0 || iscsi_target_check_conn_state(conn))
4043 goto out;
4044
4045 if (!conn->conn_transport->iscsit_get_rx_pdu)
4046 return 0;
4047
4048 conn->conn_transport->iscsit_get_rx_pdu(conn);
4049
4050 if (!signal_pending(current))
4051 atomic_set(&conn->transport_failed, 1);
4052 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4053
4054 out:
4055 if (!conn_freed) {
4056 while (!kthread_should_stop()) {
4057 msleep(100);
4058 }
4059 }
4060
4061 return 0;
4062 }
4063
iscsit_release_commands_from_conn(struct iscsi_conn * conn)4064 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4065 {
4066 LIST_HEAD(tmp_list);
4067 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4068 struct iscsi_session *sess = conn->sess;
4069 /*
4070 * We expect this function to only ever be called from either RX or TX
4071 * thread context via iscsit_close_connection() once the other context
4072 * has been reset -> returned sleeping pre-handler state.
4073 */
4074 spin_lock_bh(&conn->cmd_lock);
4075 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4076
4077 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4078 struct se_cmd *se_cmd = &cmd->se_cmd;
4079
4080 if (se_cmd->se_tfo != NULL) {
4081 spin_lock(&se_cmd->t_state_lock);
4082 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4083 spin_unlock(&se_cmd->t_state_lock);
4084 }
4085 }
4086 spin_unlock_bh(&conn->cmd_lock);
4087
4088 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4089 list_del_init(&cmd->i_conn_node);
4090
4091 iscsit_increment_maxcmdsn(cmd, sess);
4092 iscsit_free_cmd(cmd, true);
4093
4094 }
4095 }
4096
iscsit_stop_timers_for_cmds(struct iscsi_conn * conn)4097 static void iscsit_stop_timers_for_cmds(
4098 struct iscsi_conn *conn)
4099 {
4100 struct iscsi_cmd *cmd;
4101
4102 spin_lock_bh(&conn->cmd_lock);
4103 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4104 if (cmd->data_direction == DMA_TO_DEVICE)
4105 iscsit_stop_dataout_timer(cmd);
4106 }
4107 spin_unlock_bh(&conn->cmd_lock);
4108 }
4109
iscsit_close_connection(struct iscsi_conn * conn)4110 int iscsit_close_connection(
4111 struct iscsi_conn *conn)
4112 {
4113 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4114 struct iscsi_session *sess = conn->sess;
4115
4116 pr_debug("Closing iSCSI connection CID %hu on SID:"
4117 " %u\n", conn->cid, sess->sid);
4118 /*
4119 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4120 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4121 * sleeping and the logout response never got sent because the
4122 * connection failed.
4123 *
4124 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4125 * to signal logout response TX interrupt completion. Go ahead and skip
4126 * this for iser since isert_rx_opcode() does not wait on logout failure,
4127 * and to avoid iscsi_conn pointer dereference in iser-target code.
4128 */
4129 if (!conn->conn_transport->rdma_shutdown)
4130 complete(&conn->conn_logout_comp);
4131
4132 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4133 if (conn->tx_thread &&
4134 cmpxchg(&conn->tx_thread_active, true, false)) {
4135 send_sig(SIGINT, conn->tx_thread, 1);
4136 kthread_stop(conn->tx_thread);
4137 }
4138 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4139 if (conn->rx_thread &&
4140 cmpxchg(&conn->rx_thread_active, true, false)) {
4141 send_sig(SIGINT, conn->rx_thread, 1);
4142 kthread_stop(conn->rx_thread);
4143 }
4144 }
4145
4146 spin_lock(&iscsit_global->ts_bitmap_lock);
4147 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4148 get_order(1));
4149 spin_unlock(&iscsit_global->ts_bitmap_lock);
4150
4151 iscsit_stop_timers_for_cmds(conn);
4152 iscsit_stop_nopin_response_timer(conn);
4153 iscsit_stop_nopin_timer(conn);
4154
4155 if (conn->conn_transport->iscsit_wait_conn)
4156 conn->conn_transport->iscsit_wait_conn(conn);
4157
4158 /*
4159 * During Connection recovery drop unacknowledged out of order
4160 * commands for this connection, and prepare the other commands
4161 * for realligence.
4162 *
4163 * During normal operation clear the out of order commands (but
4164 * do not free the struct iscsi_ooo_cmdsn's) and release all
4165 * struct iscsi_cmds.
4166 */
4167 if (atomic_read(&conn->connection_recovery)) {
4168 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4169 iscsit_prepare_cmds_for_realligance(conn);
4170 } else {
4171 iscsit_clear_ooo_cmdsns_for_conn(conn);
4172 iscsit_release_commands_from_conn(conn);
4173 }
4174 iscsit_free_queue_reqs_for_conn(conn);
4175
4176 /*
4177 * Handle decrementing session or connection usage count if
4178 * a logout response was not able to be sent because the
4179 * connection failed. Fall back to Session Recovery here.
4180 */
4181 if (atomic_read(&conn->conn_logout_remove)) {
4182 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4183 iscsit_dec_conn_usage_count(conn);
4184 iscsit_dec_session_usage_count(sess);
4185 }
4186 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4187 iscsit_dec_conn_usage_count(conn);
4188
4189 atomic_set(&conn->conn_logout_remove, 0);
4190 atomic_set(&sess->session_reinstatement, 0);
4191 atomic_set(&sess->session_fall_back_to_erl0, 1);
4192 }
4193
4194 spin_lock_bh(&sess->conn_lock);
4195 list_del(&conn->conn_list);
4196
4197 /*
4198 * Attempt to let the Initiator know this connection failed by
4199 * sending an Connection Dropped Async Message on another
4200 * active connection.
4201 */
4202 if (atomic_read(&conn->connection_recovery))
4203 iscsit_build_conn_drop_async_message(conn);
4204
4205 spin_unlock_bh(&sess->conn_lock);
4206
4207 /*
4208 * If connection reinstatement is being performed on this connection,
4209 * up the connection reinstatement semaphore that is being blocked on
4210 * in iscsit_cause_connection_reinstatement().
4211 */
4212 spin_lock_bh(&conn->state_lock);
4213 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4214 spin_unlock_bh(&conn->state_lock);
4215 complete(&conn->conn_wait_comp);
4216 wait_for_completion(&conn->conn_post_wait_comp);
4217 spin_lock_bh(&conn->state_lock);
4218 }
4219
4220 /*
4221 * If connection reinstatement is being performed on this connection
4222 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4223 * connection wait rcfr semaphore that is being blocked on
4224 * an iscsit_connection_reinstatement_rcfr().
4225 */
4226 if (atomic_read(&conn->connection_wait_rcfr)) {
4227 spin_unlock_bh(&conn->state_lock);
4228 complete(&conn->conn_wait_rcfr_comp);
4229 wait_for_completion(&conn->conn_post_wait_comp);
4230 spin_lock_bh(&conn->state_lock);
4231 }
4232 atomic_set(&conn->connection_reinstatement, 1);
4233 spin_unlock_bh(&conn->state_lock);
4234
4235 /*
4236 * If any other processes are accessing this connection pointer we
4237 * must wait until they have completed.
4238 */
4239 iscsit_check_conn_usage_count(conn);
4240
4241 ahash_request_free(conn->conn_tx_hash);
4242 if (conn->conn_rx_hash) {
4243 struct crypto_ahash *tfm;
4244
4245 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4246 ahash_request_free(conn->conn_rx_hash);
4247 crypto_free_ahash(tfm);
4248 }
4249
4250 free_cpumask_var(conn->conn_cpumask);
4251
4252 kfree(conn->conn_ops);
4253 conn->conn_ops = NULL;
4254
4255 if (conn->sock)
4256 sock_release(conn->sock);
4257
4258 if (conn->conn_transport->iscsit_free_conn)
4259 conn->conn_transport->iscsit_free_conn(conn);
4260
4261 iscsit_put_transport(conn->conn_transport);
4262
4263 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4264 conn->conn_state = TARG_CONN_STATE_FREE;
4265 kfree(conn);
4266
4267 spin_lock_bh(&sess->conn_lock);
4268 atomic_dec(&sess->nconn);
4269 pr_debug("Decremented iSCSI connection count to %hu from node:"
4270 " %s\n", atomic_read(&sess->nconn),
4271 sess->sess_ops->InitiatorName);
4272 /*
4273 * Make sure that if one connection fails in an non ERL=2 iSCSI
4274 * Session that they all fail.
4275 */
4276 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4277 !atomic_read(&sess->session_logout))
4278 atomic_set(&sess->session_fall_back_to_erl0, 1);
4279
4280 /*
4281 * If this was not the last connection in the session, and we are
4282 * performing session reinstatement or falling back to ERL=0, call
4283 * iscsit_stop_session() without sleeping to shutdown the other
4284 * active connections.
4285 */
4286 if (atomic_read(&sess->nconn)) {
4287 if (!atomic_read(&sess->session_reinstatement) &&
4288 !atomic_read(&sess->session_fall_back_to_erl0)) {
4289 spin_unlock_bh(&sess->conn_lock);
4290 return 0;
4291 }
4292 if (!atomic_read(&sess->session_stop_active)) {
4293 atomic_set(&sess->session_stop_active, 1);
4294 spin_unlock_bh(&sess->conn_lock);
4295 iscsit_stop_session(sess, 0, 0);
4296 return 0;
4297 }
4298 spin_unlock_bh(&sess->conn_lock);
4299 return 0;
4300 }
4301
4302 /*
4303 * If this was the last connection in the session and one of the
4304 * following is occurring:
4305 *
4306 * Session Reinstatement is not being performed, and are falling back
4307 * to ERL=0 call iscsit_close_session().
4308 *
4309 * Session Logout was requested. iscsit_close_session() will be called
4310 * elsewhere.
4311 *
4312 * Session Continuation is not being performed, start the Time2Retain
4313 * handler and check if sleep_on_sess_wait_sem is active.
4314 */
4315 if (!atomic_read(&sess->session_reinstatement) &&
4316 atomic_read(&sess->session_fall_back_to_erl0)) {
4317 spin_unlock_bh(&sess->conn_lock);
4318 iscsit_close_session(sess);
4319
4320 return 0;
4321 } else if (atomic_read(&sess->session_logout)) {
4322 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4323 sess->session_state = TARG_SESS_STATE_FREE;
4324 spin_unlock_bh(&sess->conn_lock);
4325
4326 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4327 complete(&sess->session_wait_comp);
4328
4329 return 0;
4330 } else {
4331 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4332 sess->session_state = TARG_SESS_STATE_FAILED;
4333
4334 if (!atomic_read(&sess->session_continuation)) {
4335 spin_unlock_bh(&sess->conn_lock);
4336 iscsit_start_time2retain_handler(sess);
4337 } else
4338 spin_unlock_bh(&sess->conn_lock);
4339
4340 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4341 complete(&sess->session_wait_comp);
4342
4343 return 0;
4344 }
4345 }
4346
4347 /*
4348 * If the iSCSI Session for the iSCSI Initiator Node exists,
4349 * forcefully shutdown the iSCSI NEXUS.
4350 */
iscsit_close_session(struct iscsi_session * sess)4351 int iscsit_close_session(struct iscsi_session *sess)
4352 {
4353 struct iscsi_portal_group *tpg = sess->tpg;
4354 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4355
4356 if (atomic_read(&sess->nconn)) {
4357 pr_err("%d connection(s) still exist for iSCSI session"
4358 " to %s\n", atomic_read(&sess->nconn),
4359 sess->sess_ops->InitiatorName);
4360 BUG();
4361 }
4362
4363 spin_lock_bh(&se_tpg->session_lock);
4364 atomic_set(&sess->session_logout, 1);
4365 atomic_set(&sess->session_reinstatement, 1);
4366 iscsit_stop_time2retain_timer(sess);
4367 spin_unlock_bh(&se_tpg->session_lock);
4368
4369 /*
4370 * transport_deregister_session_configfs() will clear the
4371 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4372 * can be setting it again with __transport_register_session() in
4373 * iscsi_post_login_handler() again after the iscsit_stop_session()
4374 * completes in iscsi_np context.
4375 */
4376 transport_deregister_session_configfs(sess->se_sess);
4377
4378 /*
4379 * If any other processes are accessing this session pointer we must
4380 * wait until they have completed. If we are in an interrupt (the
4381 * time2retain handler) and contain and active session usage count we
4382 * restart the timer and exit.
4383 */
4384 if (!in_interrupt()) {
4385 if (iscsit_check_session_usage_count(sess) == 1)
4386 iscsit_stop_session(sess, 1, 1);
4387 } else {
4388 if (iscsit_check_session_usage_count(sess) == 2) {
4389 atomic_set(&sess->session_logout, 0);
4390 iscsit_start_time2retain_handler(sess);
4391 return 0;
4392 }
4393 }
4394
4395 transport_deregister_session(sess->se_sess);
4396
4397 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4398 iscsit_free_connection_recovery_entires(sess);
4399
4400 iscsit_free_all_ooo_cmdsns(sess);
4401
4402 spin_lock_bh(&se_tpg->session_lock);
4403 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4404 sess->session_state = TARG_SESS_STATE_FREE;
4405 pr_debug("Released iSCSI session from node: %s\n",
4406 sess->sess_ops->InitiatorName);
4407 tpg->nsessions--;
4408 if (tpg->tpg_tiqn)
4409 tpg->tpg_tiqn->tiqn_nsessions--;
4410
4411 pr_debug("Decremented number of active iSCSI Sessions on"
4412 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4413
4414 spin_lock(&sess_idr_lock);
4415 idr_remove(&sess_idr, sess->session_index);
4416 spin_unlock(&sess_idr_lock);
4417
4418 kfree(sess->sess_ops);
4419 sess->sess_ops = NULL;
4420 spin_unlock_bh(&se_tpg->session_lock);
4421
4422 kfree(sess);
4423 return 0;
4424 }
4425
iscsit_logout_post_handler_closesession(struct iscsi_conn * conn)4426 static void iscsit_logout_post_handler_closesession(
4427 struct iscsi_conn *conn)
4428 {
4429 struct iscsi_session *sess = conn->sess;
4430 int sleep = 1;
4431 /*
4432 * Traditional iscsi/tcp will invoke this logic from TX thread
4433 * context during session logout, so clear tx_thread_active and
4434 * sleep if iscsit_close_connection() has not already occured.
4435 *
4436 * Since iser-target invokes this logic from it's own workqueue,
4437 * always sleep waiting for RX/TX thread shutdown to complete
4438 * within iscsit_close_connection().
4439 */
4440 if (!conn->conn_transport->rdma_shutdown) {
4441 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4442 if (!sleep)
4443 return;
4444 }
4445
4446 atomic_set(&conn->conn_logout_remove, 0);
4447 complete(&conn->conn_logout_comp);
4448
4449 iscsit_dec_conn_usage_count(conn);
4450 iscsit_stop_session(sess, sleep, sleep);
4451 iscsit_dec_session_usage_count(sess);
4452 iscsit_close_session(sess);
4453 }
4454
iscsit_logout_post_handler_samecid(struct iscsi_conn * conn)4455 static void iscsit_logout_post_handler_samecid(
4456 struct iscsi_conn *conn)
4457 {
4458 int sleep = 1;
4459
4460 if (!conn->conn_transport->rdma_shutdown) {
4461 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4462 if (!sleep)
4463 return;
4464 }
4465
4466 atomic_set(&conn->conn_logout_remove, 0);
4467 complete(&conn->conn_logout_comp);
4468
4469 iscsit_cause_connection_reinstatement(conn, sleep);
4470 iscsit_dec_conn_usage_count(conn);
4471 }
4472
iscsit_logout_post_handler_diffcid(struct iscsi_conn * conn,u16 cid)4473 static void iscsit_logout_post_handler_diffcid(
4474 struct iscsi_conn *conn,
4475 u16 cid)
4476 {
4477 struct iscsi_conn *l_conn;
4478 struct iscsi_session *sess = conn->sess;
4479 bool conn_found = false;
4480
4481 if (!sess)
4482 return;
4483
4484 spin_lock_bh(&sess->conn_lock);
4485 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4486 if (l_conn->cid == cid) {
4487 iscsit_inc_conn_usage_count(l_conn);
4488 conn_found = true;
4489 break;
4490 }
4491 }
4492 spin_unlock_bh(&sess->conn_lock);
4493
4494 if (!conn_found)
4495 return;
4496
4497 if (l_conn->sock)
4498 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4499
4500 spin_lock_bh(&l_conn->state_lock);
4501 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4502 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4503 spin_unlock_bh(&l_conn->state_lock);
4504
4505 iscsit_cause_connection_reinstatement(l_conn, 1);
4506 iscsit_dec_conn_usage_count(l_conn);
4507 }
4508
4509 /*
4510 * Return of 0 causes the TX thread to restart.
4511 */
iscsit_logout_post_handler(struct iscsi_cmd * cmd,struct iscsi_conn * conn)4512 int iscsit_logout_post_handler(
4513 struct iscsi_cmd *cmd,
4514 struct iscsi_conn *conn)
4515 {
4516 int ret = 0;
4517
4518 switch (cmd->logout_reason) {
4519 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4520 switch (cmd->logout_response) {
4521 case ISCSI_LOGOUT_SUCCESS:
4522 case ISCSI_LOGOUT_CLEANUP_FAILED:
4523 default:
4524 iscsit_logout_post_handler_closesession(conn);
4525 break;
4526 }
4527 ret = 0;
4528 break;
4529 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4530 if (conn->cid == cmd->logout_cid) {
4531 switch (cmd->logout_response) {
4532 case ISCSI_LOGOUT_SUCCESS:
4533 case ISCSI_LOGOUT_CLEANUP_FAILED:
4534 default:
4535 iscsit_logout_post_handler_samecid(conn);
4536 break;
4537 }
4538 ret = 0;
4539 } else {
4540 switch (cmd->logout_response) {
4541 case ISCSI_LOGOUT_SUCCESS:
4542 iscsit_logout_post_handler_diffcid(conn,
4543 cmd->logout_cid);
4544 break;
4545 case ISCSI_LOGOUT_CID_NOT_FOUND:
4546 case ISCSI_LOGOUT_CLEANUP_FAILED:
4547 default:
4548 break;
4549 }
4550 ret = 1;
4551 }
4552 break;
4553 case ISCSI_LOGOUT_REASON_RECOVERY:
4554 switch (cmd->logout_response) {
4555 case ISCSI_LOGOUT_SUCCESS:
4556 case ISCSI_LOGOUT_CID_NOT_FOUND:
4557 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4558 case ISCSI_LOGOUT_CLEANUP_FAILED:
4559 default:
4560 break;
4561 }
4562 ret = 1;
4563 break;
4564 default:
4565 break;
4566
4567 }
4568 return ret;
4569 }
4570 EXPORT_SYMBOL(iscsit_logout_post_handler);
4571
iscsit_fail_session(struct iscsi_session * sess)4572 void iscsit_fail_session(struct iscsi_session *sess)
4573 {
4574 struct iscsi_conn *conn;
4575
4576 spin_lock_bh(&sess->conn_lock);
4577 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4578 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4579 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4580 }
4581 spin_unlock_bh(&sess->conn_lock);
4582
4583 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4584 sess->session_state = TARG_SESS_STATE_FAILED;
4585 }
4586
iscsit_free_session(struct iscsi_session * sess)4587 int iscsit_free_session(struct iscsi_session *sess)
4588 {
4589 u16 conn_count = atomic_read(&sess->nconn);
4590 struct iscsi_conn *conn, *conn_tmp = NULL;
4591 int is_last;
4592
4593 spin_lock_bh(&sess->conn_lock);
4594 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4595
4596 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4597 conn_list) {
4598 if (conn_count == 0)
4599 break;
4600
4601 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4602 is_last = 1;
4603 } else {
4604 iscsit_inc_conn_usage_count(conn_tmp);
4605 is_last = 0;
4606 }
4607 iscsit_inc_conn_usage_count(conn);
4608
4609 spin_unlock_bh(&sess->conn_lock);
4610 iscsit_cause_connection_reinstatement(conn, 1);
4611 spin_lock_bh(&sess->conn_lock);
4612
4613 iscsit_dec_conn_usage_count(conn);
4614 if (is_last == 0)
4615 iscsit_dec_conn_usage_count(conn_tmp);
4616
4617 conn_count--;
4618 }
4619
4620 if (atomic_read(&sess->nconn)) {
4621 spin_unlock_bh(&sess->conn_lock);
4622 wait_for_completion(&sess->session_wait_comp);
4623 } else
4624 spin_unlock_bh(&sess->conn_lock);
4625
4626 iscsit_close_session(sess);
4627 return 0;
4628 }
4629
iscsit_stop_session(struct iscsi_session * sess,int session_sleep,int connection_sleep)4630 void iscsit_stop_session(
4631 struct iscsi_session *sess,
4632 int session_sleep,
4633 int connection_sleep)
4634 {
4635 u16 conn_count = atomic_read(&sess->nconn);
4636 struct iscsi_conn *conn, *conn_tmp = NULL;
4637 int is_last;
4638
4639 spin_lock_bh(&sess->conn_lock);
4640 if (session_sleep)
4641 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4642
4643 if (connection_sleep) {
4644 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4645 conn_list) {
4646 if (conn_count == 0)
4647 break;
4648
4649 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4650 is_last = 1;
4651 } else {
4652 iscsit_inc_conn_usage_count(conn_tmp);
4653 is_last = 0;
4654 }
4655 iscsit_inc_conn_usage_count(conn);
4656
4657 spin_unlock_bh(&sess->conn_lock);
4658 iscsit_cause_connection_reinstatement(conn, 1);
4659 spin_lock_bh(&sess->conn_lock);
4660
4661 iscsit_dec_conn_usage_count(conn);
4662 if (is_last == 0)
4663 iscsit_dec_conn_usage_count(conn_tmp);
4664 conn_count--;
4665 }
4666 } else {
4667 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4668 iscsit_cause_connection_reinstatement(conn, 0);
4669 }
4670
4671 if (session_sleep && atomic_read(&sess->nconn)) {
4672 spin_unlock_bh(&sess->conn_lock);
4673 wait_for_completion(&sess->session_wait_comp);
4674 } else
4675 spin_unlock_bh(&sess->conn_lock);
4676 }
4677
iscsit_release_sessions_for_tpg(struct iscsi_portal_group * tpg,int force)4678 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4679 {
4680 struct iscsi_session *sess;
4681 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4682 struct se_session *se_sess, *se_sess_tmp;
4683 LIST_HEAD(free_list);
4684 int session_count = 0;
4685
4686 spin_lock_bh(&se_tpg->session_lock);
4687 if (tpg->nsessions && !force) {
4688 spin_unlock_bh(&se_tpg->session_lock);
4689 return -1;
4690 }
4691
4692 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4693 sess_list) {
4694 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4695
4696 spin_lock(&sess->conn_lock);
4697 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4698 atomic_read(&sess->session_logout) ||
4699 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4700 spin_unlock(&sess->conn_lock);
4701 continue;
4702 }
4703 atomic_set(&sess->session_reinstatement, 1);
4704 atomic_set(&sess->session_fall_back_to_erl0, 1);
4705 spin_unlock(&sess->conn_lock);
4706
4707 list_move_tail(&se_sess->sess_list, &free_list);
4708 }
4709 spin_unlock_bh(&se_tpg->session_lock);
4710
4711 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4712 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4713
4714 iscsit_free_session(sess);
4715 session_count++;
4716 }
4717
4718 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4719 " Group: %hu\n", session_count, tpg->tpgt);
4720 return 0;
4721 }
4722
4723 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4724 MODULE_VERSION("4.1.x");
4725 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4726 MODULE_LICENSE("GPL");
4727
4728 module_init(iscsi_target_init_module);
4729 module_exit(iscsi_target_cleanup_module);
4730