1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3 * This file contains main functions related to the iSCSI Target Core Driver.
4 *
5 * (c) Copyright 2007-2013 Datera, Inc.
6 *
7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 *
9 ******************************************************************************/
10
11 #include <crypto/hash.h>
12 #include <linux/string.h>
13 #include <linux/kthread.h>
14 #include <linux/completion.h>
15 #include <linux/module.h>
16 #include <linux/vmalloc.h>
17 #include <linux/idr.h>
18 #include <linux/delay.h>
19 #include <linux/sched/signal.h>
20 #include <asm/unaligned.h>
21 #include <linux/inet.h>
22 #include <net/ipv6.h>
23 #include <scsi/scsi_proto.h>
24 #include <scsi/iscsi_proto.h>
25 #include <scsi/scsi_tcq.h>
26 #include <target/target_core_base.h>
27 #include <target/target_core_fabric.h>
28
29 #include <target/iscsi/iscsi_target_core.h>
30 #include "iscsi_target_parameters.h"
31 #include "iscsi_target_seq_pdu_list.h"
32 #include "iscsi_target_datain_values.h"
33 #include "iscsi_target_erl0.h"
34 #include "iscsi_target_erl1.h"
35 #include "iscsi_target_erl2.h"
36 #include "iscsi_target_login.h"
37 #include "iscsi_target_tmr.h"
38 #include "iscsi_target_tpg.h"
39 #include "iscsi_target_util.h"
40 #include "iscsi_target.h"
41 #include "iscsi_target_device.h"
42 #include <target/iscsi/iscsi_target_stat.h>
43
44 #include <target/iscsi/iscsi_transport.h>
45
46 static LIST_HEAD(g_tiqn_list);
47 static LIST_HEAD(g_np_list);
48 static DEFINE_SPINLOCK(tiqn_lock);
49 static DEFINE_MUTEX(np_lock);
50
51 static struct idr tiqn_idr;
52 DEFINE_IDA(sess_ida);
53 struct mutex auth_id_lock;
54
55 struct iscsit_global *iscsit_global;
56
57 struct kmem_cache *lio_qr_cache;
58 struct kmem_cache *lio_dr_cache;
59 struct kmem_cache *lio_ooo_cache;
60 struct kmem_cache *lio_r2t_cache;
61
62 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
63 struct iscsi_scsi_req *, u32);
64
iscsit_get_tiqn_for_login(unsigned char * buf)65 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
66 {
67 struct iscsi_tiqn *tiqn = NULL;
68
69 spin_lock(&tiqn_lock);
70 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
71 if (!strcmp(tiqn->tiqn, buf)) {
72
73 spin_lock(&tiqn->tiqn_state_lock);
74 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
75 tiqn->tiqn_access_count++;
76 spin_unlock(&tiqn->tiqn_state_lock);
77 spin_unlock(&tiqn_lock);
78 return tiqn;
79 }
80 spin_unlock(&tiqn->tiqn_state_lock);
81 }
82 }
83 spin_unlock(&tiqn_lock);
84
85 return NULL;
86 }
87
iscsit_set_tiqn_shutdown(struct iscsi_tiqn * tiqn)88 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
89 {
90 spin_lock(&tiqn->tiqn_state_lock);
91 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
92 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
93 spin_unlock(&tiqn->tiqn_state_lock);
94 return 0;
95 }
96 spin_unlock(&tiqn->tiqn_state_lock);
97
98 return -1;
99 }
100
iscsit_put_tiqn_for_login(struct iscsi_tiqn * tiqn)101 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
102 {
103 spin_lock(&tiqn->tiqn_state_lock);
104 tiqn->tiqn_access_count--;
105 spin_unlock(&tiqn->tiqn_state_lock);
106 }
107
108 /*
109 * Note that IQN formatting is expected to be done in userspace, and
110 * no explict IQN format checks are done here.
111 */
iscsit_add_tiqn(unsigned char * buf)112 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
113 {
114 struct iscsi_tiqn *tiqn = NULL;
115 int ret;
116
117 if (strlen(buf) >= ISCSI_IQN_LEN) {
118 pr_err("Target IQN exceeds %d bytes\n",
119 ISCSI_IQN_LEN);
120 return ERR_PTR(-EINVAL);
121 }
122
123 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
124 if (!tiqn)
125 return ERR_PTR(-ENOMEM);
126
127 sprintf(tiqn->tiqn, "%s", buf);
128 INIT_LIST_HEAD(&tiqn->tiqn_list);
129 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
130 spin_lock_init(&tiqn->tiqn_state_lock);
131 spin_lock_init(&tiqn->tiqn_tpg_lock);
132 spin_lock_init(&tiqn->sess_err_stats.lock);
133 spin_lock_init(&tiqn->login_stats.lock);
134 spin_lock_init(&tiqn->logout_stats.lock);
135
136 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
137
138 idr_preload(GFP_KERNEL);
139 spin_lock(&tiqn_lock);
140
141 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
142 if (ret < 0) {
143 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
144 spin_unlock(&tiqn_lock);
145 idr_preload_end();
146 kfree(tiqn);
147 return ERR_PTR(ret);
148 }
149 tiqn->tiqn_index = ret;
150 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
151
152 spin_unlock(&tiqn_lock);
153 idr_preload_end();
154
155 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
156
157 return tiqn;
158
159 }
160
iscsit_wait_for_tiqn(struct iscsi_tiqn * tiqn)161 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
162 {
163 /*
164 * Wait for accesses to said struct iscsi_tiqn to end.
165 */
166 spin_lock(&tiqn->tiqn_state_lock);
167 while (tiqn->tiqn_access_count != 0) {
168 spin_unlock(&tiqn->tiqn_state_lock);
169 msleep(10);
170 spin_lock(&tiqn->tiqn_state_lock);
171 }
172 spin_unlock(&tiqn->tiqn_state_lock);
173 }
174
iscsit_del_tiqn(struct iscsi_tiqn * tiqn)175 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
176 {
177 /*
178 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
179 * while holding tiqn->tiqn_state_lock. This means that all subsequent
180 * attempts to access this struct iscsi_tiqn will fail from both transport
181 * fabric and control code paths.
182 */
183 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
184 pr_err("iscsit_set_tiqn_shutdown() failed\n");
185 return;
186 }
187
188 iscsit_wait_for_tiqn(tiqn);
189
190 spin_lock(&tiqn_lock);
191 list_del(&tiqn->tiqn_list);
192 idr_remove(&tiqn_idr, tiqn->tiqn_index);
193 spin_unlock(&tiqn_lock);
194
195 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
196 tiqn->tiqn);
197 kfree(tiqn);
198 }
199
iscsit_access_np(struct iscsi_np * np,struct iscsi_portal_group * tpg)200 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
201 {
202 int ret;
203 /*
204 * Determine if the network portal is accepting storage traffic.
205 */
206 spin_lock_bh(&np->np_thread_lock);
207 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
208 spin_unlock_bh(&np->np_thread_lock);
209 return -1;
210 }
211 spin_unlock_bh(&np->np_thread_lock);
212 /*
213 * Determine if the portal group is accepting storage traffic.
214 */
215 spin_lock_bh(&tpg->tpg_state_lock);
216 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
217 spin_unlock_bh(&tpg->tpg_state_lock);
218 return -1;
219 }
220 spin_unlock_bh(&tpg->tpg_state_lock);
221
222 /*
223 * Here we serialize access across the TIQN+TPG Tuple.
224 */
225 ret = down_interruptible(&tpg->np_login_sem);
226 if (ret != 0)
227 return -1;
228
229 spin_lock_bh(&tpg->tpg_state_lock);
230 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
231 spin_unlock_bh(&tpg->tpg_state_lock);
232 up(&tpg->np_login_sem);
233 return -1;
234 }
235 spin_unlock_bh(&tpg->tpg_state_lock);
236
237 return 0;
238 }
239
iscsit_login_kref_put(struct kref * kref)240 void iscsit_login_kref_put(struct kref *kref)
241 {
242 struct iscsi_tpg_np *tpg_np = container_of(kref,
243 struct iscsi_tpg_np, tpg_np_kref);
244
245 complete(&tpg_np->tpg_np_comp);
246 }
247
iscsit_deaccess_np(struct iscsi_np * np,struct iscsi_portal_group * tpg,struct iscsi_tpg_np * tpg_np)248 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
249 struct iscsi_tpg_np *tpg_np)
250 {
251 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
252
253 up(&tpg->np_login_sem);
254
255 if (tpg_np)
256 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
257
258 if (tiqn)
259 iscsit_put_tiqn_for_login(tiqn);
260
261 return 0;
262 }
263
iscsit_check_np_match(struct sockaddr_storage * sockaddr,struct iscsi_np * np,int network_transport)264 bool iscsit_check_np_match(
265 struct sockaddr_storage *sockaddr,
266 struct iscsi_np *np,
267 int network_transport)
268 {
269 struct sockaddr_in *sock_in, *sock_in_e;
270 struct sockaddr_in6 *sock_in6, *sock_in6_e;
271 bool ip_match = false;
272 u16 port, port_e;
273
274 if (sockaddr->ss_family == AF_INET6) {
275 sock_in6 = (struct sockaddr_in6 *)sockaddr;
276 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
277
278 if (!memcmp(&sock_in6->sin6_addr.in6_u,
279 &sock_in6_e->sin6_addr.in6_u,
280 sizeof(struct in6_addr)))
281 ip_match = true;
282
283 port = ntohs(sock_in6->sin6_port);
284 port_e = ntohs(sock_in6_e->sin6_port);
285 } else {
286 sock_in = (struct sockaddr_in *)sockaddr;
287 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
288
289 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
290 ip_match = true;
291
292 port = ntohs(sock_in->sin_port);
293 port_e = ntohs(sock_in_e->sin_port);
294 }
295
296 if (ip_match && (port_e == port) &&
297 (np->np_network_transport == network_transport))
298 return true;
299
300 return false;
301 }
302
iscsit_get_np(struct sockaddr_storage * sockaddr,int network_transport)303 static struct iscsi_np *iscsit_get_np(
304 struct sockaddr_storage *sockaddr,
305 int network_transport)
306 {
307 struct iscsi_np *np;
308 bool match;
309
310 lockdep_assert_held(&np_lock);
311
312 list_for_each_entry(np, &g_np_list, np_list) {
313 spin_lock_bh(&np->np_thread_lock);
314 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
315 spin_unlock_bh(&np->np_thread_lock);
316 continue;
317 }
318
319 match = iscsit_check_np_match(sockaddr, np, network_transport);
320 if (match) {
321 /*
322 * Increment the np_exports reference count now to
323 * prevent iscsit_del_np() below from being called
324 * while iscsi_tpg_add_network_portal() is called.
325 */
326 np->np_exports++;
327 spin_unlock_bh(&np->np_thread_lock);
328 return np;
329 }
330 spin_unlock_bh(&np->np_thread_lock);
331 }
332
333 return NULL;
334 }
335
iscsit_add_np(struct sockaddr_storage * sockaddr,int network_transport)336 struct iscsi_np *iscsit_add_np(
337 struct sockaddr_storage *sockaddr,
338 int network_transport)
339 {
340 struct iscsi_np *np;
341 int ret;
342
343 mutex_lock(&np_lock);
344
345 /*
346 * Locate the existing struct iscsi_np if already active..
347 */
348 np = iscsit_get_np(sockaddr, network_transport);
349 if (np) {
350 mutex_unlock(&np_lock);
351 return np;
352 }
353
354 np = kzalloc(sizeof(*np), GFP_KERNEL);
355 if (!np) {
356 mutex_unlock(&np_lock);
357 return ERR_PTR(-ENOMEM);
358 }
359
360 np->np_flags |= NPF_IP_NETWORK;
361 np->np_network_transport = network_transport;
362 spin_lock_init(&np->np_thread_lock);
363 init_completion(&np->np_restart_comp);
364 INIT_LIST_HEAD(&np->np_list);
365
366 timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
367
368 ret = iscsi_target_setup_login_socket(np, sockaddr);
369 if (ret != 0) {
370 kfree(np);
371 mutex_unlock(&np_lock);
372 return ERR_PTR(ret);
373 }
374
375 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
376 if (IS_ERR(np->np_thread)) {
377 pr_err("Unable to create kthread: iscsi_np\n");
378 ret = PTR_ERR(np->np_thread);
379 kfree(np);
380 mutex_unlock(&np_lock);
381 return ERR_PTR(ret);
382 }
383 /*
384 * Increment the np_exports reference count now to prevent
385 * iscsit_del_np() below from being run while a new call to
386 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
387 * active. We don't need to hold np->np_thread_lock at this
388 * point because iscsi_np has not been added to g_np_list yet.
389 */
390 np->np_exports = 1;
391 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
392
393 list_add_tail(&np->np_list, &g_np_list);
394 mutex_unlock(&np_lock);
395
396 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
397 &np->np_sockaddr, np->np_transport->name);
398
399 return np;
400 }
401
iscsit_reset_np_thread(struct iscsi_np * np,struct iscsi_tpg_np * tpg_np,struct iscsi_portal_group * tpg,bool shutdown)402 int iscsit_reset_np_thread(
403 struct iscsi_np *np,
404 struct iscsi_tpg_np *tpg_np,
405 struct iscsi_portal_group *tpg,
406 bool shutdown)
407 {
408 spin_lock_bh(&np->np_thread_lock);
409 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
410 spin_unlock_bh(&np->np_thread_lock);
411 return 0;
412 }
413 np->np_thread_state = ISCSI_NP_THREAD_RESET;
414 atomic_inc(&np->np_reset_count);
415
416 if (np->np_thread) {
417 spin_unlock_bh(&np->np_thread_lock);
418 send_sig(SIGINT, np->np_thread, 1);
419 wait_for_completion(&np->np_restart_comp);
420 spin_lock_bh(&np->np_thread_lock);
421 }
422 spin_unlock_bh(&np->np_thread_lock);
423
424 if (tpg_np && shutdown) {
425 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
426
427 wait_for_completion(&tpg_np->tpg_np_comp);
428 }
429
430 return 0;
431 }
432
iscsit_free_np(struct iscsi_np * np)433 static void iscsit_free_np(struct iscsi_np *np)
434 {
435 if (np->np_socket)
436 sock_release(np->np_socket);
437 }
438
iscsit_del_np(struct iscsi_np * np)439 int iscsit_del_np(struct iscsi_np *np)
440 {
441 spin_lock_bh(&np->np_thread_lock);
442 np->np_exports--;
443 if (np->np_exports) {
444 np->enabled = true;
445 spin_unlock_bh(&np->np_thread_lock);
446 return 0;
447 }
448 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
449 spin_unlock_bh(&np->np_thread_lock);
450
451 if (np->np_thread) {
452 /*
453 * We need to send the signal to wakeup Linux/Net
454 * which may be sleeping in sock_accept()..
455 */
456 send_sig(SIGINT, np->np_thread, 1);
457 kthread_stop(np->np_thread);
458 np->np_thread = NULL;
459 }
460
461 np->np_transport->iscsit_free_np(np);
462
463 mutex_lock(&np_lock);
464 list_del(&np->np_list);
465 mutex_unlock(&np_lock);
466
467 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
468 &np->np_sockaddr, np->np_transport->name);
469
470 iscsit_put_transport(np->np_transport);
471 kfree(np);
472 return 0;
473 }
474
475 static void iscsit_get_rx_pdu(struct iscsi_conn *);
476
iscsit_queue_rsp(struct iscsi_conn * conn,struct iscsi_cmd * cmd)477 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
478 {
479 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
480 }
481 EXPORT_SYMBOL(iscsit_queue_rsp);
482
iscsit_aborted_task(struct iscsi_conn * conn,struct iscsi_cmd * cmd)483 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
484 {
485 spin_lock_bh(&conn->cmd_lock);
486 if (!list_empty(&cmd->i_conn_node))
487 list_del_init(&cmd->i_conn_node);
488 spin_unlock_bh(&conn->cmd_lock);
489
490 __iscsit_free_cmd(cmd, true);
491 }
492 EXPORT_SYMBOL(iscsit_aborted_task);
493
494 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
495 u32, u32, const void *, void *);
496 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
497
498 static int
iscsit_xmit_nondatain_pdu(struct iscsi_conn * conn,struct iscsi_cmd * cmd,const void * data_buf,u32 data_buf_len)499 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
500 const void *data_buf, u32 data_buf_len)
501 {
502 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
503 struct kvec *iov;
504 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
505 int ret;
506
507 iov = &cmd->iov_misc[0];
508 iov[niov].iov_base = cmd->pdu;
509 iov[niov++].iov_len = ISCSI_HDR_LEN;
510
511 if (conn->conn_ops->HeaderDigest) {
512 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
513
514 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
515 ISCSI_HDR_LEN, 0, NULL,
516 header_digest);
517
518 iov[0].iov_len += ISCSI_CRC_LEN;
519 tx_size += ISCSI_CRC_LEN;
520 pr_debug("Attaching CRC32C HeaderDigest"
521 " to opcode 0x%x 0x%08x\n",
522 hdr->opcode, *header_digest);
523 }
524
525 if (data_buf_len) {
526 u32 padding = ((-data_buf_len) & 3);
527
528 iov[niov].iov_base = (void *)data_buf;
529 iov[niov++].iov_len = data_buf_len;
530 tx_size += data_buf_len;
531
532 if (padding != 0) {
533 iov[niov].iov_base = &cmd->pad_bytes;
534 iov[niov++].iov_len = padding;
535 tx_size += padding;
536 pr_debug("Attaching %u additional"
537 " padding bytes.\n", padding);
538 }
539
540 if (conn->conn_ops->DataDigest) {
541 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
542 data_buf, data_buf_len,
543 padding, &cmd->pad_bytes,
544 &cmd->data_crc);
545
546 iov[niov].iov_base = &cmd->data_crc;
547 iov[niov++].iov_len = ISCSI_CRC_LEN;
548 tx_size += ISCSI_CRC_LEN;
549 pr_debug("Attached DataDigest for %u"
550 " bytes opcode 0x%x, CRC 0x%08x\n",
551 data_buf_len, hdr->opcode, cmd->data_crc);
552 }
553 }
554
555 cmd->iov_misc_count = niov;
556 cmd->tx_size = tx_size;
557
558 ret = iscsit_send_tx_data(cmd, conn, 1);
559 if (ret < 0) {
560 iscsit_tx_thread_wait_for_tcp(conn);
561 return ret;
562 }
563
564 return 0;
565 }
566
567 static int iscsit_map_iovec(struct iscsi_cmd *cmd, struct kvec *iov, int nvec,
568 u32 data_offset, u32 data_length);
569 static void iscsit_unmap_iovec(struct iscsi_cmd *);
570 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
571 u32, u32, u32, u8 *);
572 static int
iscsit_xmit_datain_pdu(struct iscsi_conn * conn,struct iscsi_cmd * cmd,const struct iscsi_datain * datain)573 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
574 const struct iscsi_datain *datain)
575 {
576 struct kvec *iov;
577 u32 iov_count = 0, tx_size = 0;
578 int ret, iov_ret;
579
580 iov = &cmd->iov_data[0];
581 iov[iov_count].iov_base = cmd->pdu;
582 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
583 tx_size += ISCSI_HDR_LEN;
584
585 if (conn->conn_ops->HeaderDigest) {
586 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
587
588 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
589 ISCSI_HDR_LEN, 0, NULL,
590 header_digest);
591
592 iov[0].iov_len += ISCSI_CRC_LEN;
593 tx_size += ISCSI_CRC_LEN;
594
595 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
596 *header_digest);
597 }
598
599 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[iov_count],
600 cmd->orig_iov_data_count - (iov_count + 2),
601 datain->offset, datain->length);
602 if (iov_ret < 0)
603 return -1;
604
605 iov_count += iov_ret;
606 tx_size += datain->length;
607
608 cmd->padding = ((-datain->length) & 3);
609 if (cmd->padding) {
610 iov[iov_count].iov_base = cmd->pad_bytes;
611 iov[iov_count++].iov_len = cmd->padding;
612 tx_size += cmd->padding;
613
614 pr_debug("Attaching %u padding bytes\n", cmd->padding);
615 }
616
617 if (conn->conn_ops->DataDigest) {
618 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
619 cmd, datain->offset,
620 datain->length,
621 cmd->padding,
622 cmd->pad_bytes);
623
624 iov[iov_count].iov_base = &cmd->data_crc;
625 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
626 tx_size += ISCSI_CRC_LEN;
627
628 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
629 datain->length + cmd->padding, cmd->data_crc);
630 }
631
632 cmd->iov_data_count = iov_count;
633 cmd->tx_size = tx_size;
634
635 ret = iscsit_fe_sendpage_sg(cmd, conn);
636
637 iscsit_unmap_iovec(cmd);
638
639 if (ret < 0) {
640 iscsit_tx_thread_wait_for_tcp(conn);
641 return ret;
642 }
643
644 return 0;
645 }
646
iscsit_xmit_pdu(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_datain_req * dr,const void * buf,u32 buf_len)647 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
648 struct iscsi_datain_req *dr, const void *buf,
649 u32 buf_len)
650 {
651 if (dr)
652 return iscsit_xmit_datain_pdu(conn, cmd, buf);
653 else
654 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
655 }
656
iscsit_get_sup_prot_ops(struct iscsi_conn * conn)657 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
658 {
659 return TARGET_PROT_NORMAL;
660 }
661
662 static struct iscsit_transport iscsi_target_transport = {
663 .name = "iSCSI/TCP",
664 .transport_type = ISCSI_TCP,
665 .rdma_shutdown = false,
666 .owner = NULL,
667 .iscsit_setup_np = iscsit_setup_np,
668 .iscsit_accept_np = iscsit_accept_np,
669 .iscsit_free_np = iscsit_free_np,
670 .iscsit_get_login_rx = iscsit_get_login_rx,
671 .iscsit_put_login_tx = iscsit_put_login_tx,
672 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
673 .iscsit_immediate_queue = iscsit_immediate_queue,
674 .iscsit_response_queue = iscsit_response_queue,
675 .iscsit_queue_data_in = iscsit_queue_rsp,
676 .iscsit_queue_status = iscsit_queue_rsp,
677 .iscsit_aborted_task = iscsit_aborted_task,
678 .iscsit_xmit_pdu = iscsit_xmit_pdu,
679 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
680 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
681 };
682
iscsi_target_init_module(void)683 static int __init iscsi_target_init_module(void)
684 {
685 int ret = 0, size;
686
687 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
688 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
689 if (!iscsit_global)
690 return -1;
691
692 spin_lock_init(&iscsit_global->ts_bitmap_lock);
693 mutex_init(&auth_id_lock);
694 idr_init(&tiqn_idr);
695
696 ret = target_register_template(&iscsi_ops);
697 if (ret)
698 goto out;
699
700 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
701 iscsit_global->ts_bitmap = vzalloc(size);
702 if (!iscsit_global->ts_bitmap)
703 goto configfs_out;
704
705 lio_qr_cache = kmem_cache_create("lio_qr_cache",
706 sizeof(struct iscsi_queue_req),
707 __alignof__(struct iscsi_queue_req), 0, NULL);
708 if (!lio_qr_cache) {
709 pr_err("Unable to kmem_cache_create() for"
710 " lio_qr_cache\n");
711 goto bitmap_out;
712 }
713
714 lio_dr_cache = kmem_cache_create("lio_dr_cache",
715 sizeof(struct iscsi_datain_req),
716 __alignof__(struct iscsi_datain_req), 0, NULL);
717 if (!lio_dr_cache) {
718 pr_err("Unable to kmem_cache_create() for"
719 " lio_dr_cache\n");
720 goto qr_out;
721 }
722
723 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
724 sizeof(struct iscsi_ooo_cmdsn),
725 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
726 if (!lio_ooo_cache) {
727 pr_err("Unable to kmem_cache_create() for"
728 " lio_ooo_cache\n");
729 goto dr_out;
730 }
731
732 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
733 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
734 0, NULL);
735 if (!lio_r2t_cache) {
736 pr_err("Unable to kmem_cache_create() for"
737 " lio_r2t_cache\n");
738 goto ooo_out;
739 }
740
741 iscsit_register_transport(&iscsi_target_transport);
742
743 if (iscsit_load_discovery_tpg() < 0)
744 goto r2t_out;
745
746 return ret;
747 r2t_out:
748 iscsit_unregister_transport(&iscsi_target_transport);
749 kmem_cache_destroy(lio_r2t_cache);
750 ooo_out:
751 kmem_cache_destroy(lio_ooo_cache);
752 dr_out:
753 kmem_cache_destroy(lio_dr_cache);
754 qr_out:
755 kmem_cache_destroy(lio_qr_cache);
756 bitmap_out:
757 vfree(iscsit_global->ts_bitmap);
758 configfs_out:
759 /* XXX: this probably wants it to be it's own unwind step.. */
760 if (iscsit_global->discovery_tpg)
761 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
762 target_unregister_template(&iscsi_ops);
763 out:
764 kfree(iscsit_global);
765 return -ENOMEM;
766 }
767
iscsi_target_cleanup_module(void)768 static void __exit iscsi_target_cleanup_module(void)
769 {
770 iscsit_release_discovery_tpg();
771 iscsit_unregister_transport(&iscsi_target_transport);
772 kmem_cache_destroy(lio_qr_cache);
773 kmem_cache_destroy(lio_dr_cache);
774 kmem_cache_destroy(lio_ooo_cache);
775 kmem_cache_destroy(lio_r2t_cache);
776
777 /*
778 * Shutdown discovery sessions and disable discovery TPG
779 */
780 if (iscsit_global->discovery_tpg)
781 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
782
783 target_unregister_template(&iscsi_ops);
784
785 vfree(iscsit_global->ts_bitmap);
786 kfree(iscsit_global);
787 }
788
iscsit_add_reject(struct iscsi_conn * conn,u8 reason,unsigned char * buf)789 int iscsit_add_reject(
790 struct iscsi_conn *conn,
791 u8 reason,
792 unsigned char *buf)
793 {
794 struct iscsi_cmd *cmd;
795
796 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
797 if (!cmd)
798 return -1;
799
800 cmd->iscsi_opcode = ISCSI_OP_REJECT;
801 cmd->reject_reason = reason;
802
803 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
804 if (!cmd->buf_ptr) {
805 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
806 iscsit_free_cmd(cmd, false);
807 return -1;
808 }
809
810 spin_lock_bh(&conn->cmd_lock);
811 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
812 spin_unlock_bh(&conn->cmd_lock);
813
814 cmd->i_state = ISTATE_SEND_REJECT;
815 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
816
817 return -1;
818 }
819 EXPORT_SYMBOL(iscsit_add_reject);
820
iscsit_add_reject_from_cmd(struct iscsi_cmd * cmd,u8 reason,bool add_to_conn,unsigned char * buf)821 static int iscsit_add_reject_from_cmd(
822 struct iscsi_cmd *cmd,
823 u8 reason,
824 bool add_to_conn,
825 unsigned char *buf)
826 {
827 struct iscsi_conn *conn;
828 const bool do_put = cmd->se_cmd.se_tfo != NULL;
829
830 if (!cmd->conn) {
831 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
832 cmd->init_task_tag);
833 return -1;
834 }
835 conn = cmd->conn;
836
837 cmd->iscsi_opcode = ISCSI_OP_REJECT;
838 cmd->reject_reason = reason;
839
840 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
841 if (!cmd->buf_ptr) {
842 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
843 iscsit_free_cmd(cmd, false);
844 return -1;
845 }
846
847 if (add_to_conn) {
848 spin_lock_bh(&conn->cmd_lock);
849 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
850 spin_unlock_bh(&conn->cmd_lock);
851 }
852
853 cmd->i_state = ISTATE_SEND_REJECT;
854 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
855 /*
856 * Perform the kref_put now if se_cmd has already been setup by
857 * scsit_setup_scsi_cmd()
858 */
859 if (do_put) {
860 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
861 target_put_sess_cmd(&cmd->se_cmd);
862 }
863 return -1;
864 }
865
iscsit_add_reject_cmd(struct iscsi_cmd * cmd,u8 reason,unsigned char * buf)866 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
867 unsigned char *buf)
868 {
869 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
870 }
871
iscsit_reject_cmd(struct iscsi_cmd * cmd,u8 reason,unsigned char * buf)872 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
873 {
874 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
875 }
876 EXPORT_SYMBOL(iscsit_reject_cmd);
877
878 /*
879 * Map some portion of the allocated scatterlist to an iovec, suitable for
880 * kernel sockets to copy data in/out.
881 */
iscsit_map_iovec(struct iscsi_cmd * cmd,struct kvec * iov,int nvec,u32 data_offset,u32 data_length)882 static int iscsit_map_iovec(struct iscsi_cmd *cmd, struct kvec *iov, int nvec,
883 u32 data_offset, u32 data_length)
884 {
885 u32 i = 0, orig_data_length = data_length;
886 struct scatterlist *sg;
887 unsigned int page_off;
888
889 /*
890 * We know each entry in t_data_sg contains a page.
891 */
892 u32 ent = data_offset / PAGE_SIZE;
893
894 if (!data_length)
895 return 0;
896
897 if (ent >= cmd->se_cmd.t_data_nents) {
898 pr_err("Initial page entry out-of-bounds\n");
899 goto overflow;
900 }
901
902 sg = &cmd->se_cmd.t_data_sg[ent];
903 page_off = (data_offset % PAGE_SIZE);
904
905 cmd->first_data_sg = sg;
906 cmd->first_data_sg_off = page_off;
907
908 while (data_length) {
909 u32 cur_len;
910
911 if (WARN_ON_ONCE(!sg || i >= nvec))
912 goto overflow;
913
914 cur_len = min_t(u32, data_length, sg->length - page_off);
915
916 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
917 iov[i].iov_len = cur_len;
918
919 data_length -= cur_len;
920 page_off = 0;
921 sg = sg_next(sg);
922 i++;
923 }
924
925 cmd->kmapped_nents = i;
926
927 return i;
928
929 overflow:
930 pr_err("offset %d + length %d overflow; %d/%d; sg-list:\n",
931 data_offset, orig_data_length, i, nvec);
932 for_each_sg(cmd->se_cmd.t_data_sg, sg,
933 cmd->se_cmd.t_data_nents, i) {
934 pr_err("[%d] off %d len %d\n",
935 i, sg->offset, sg->length);
936 }
937 return -1;
938 }
939
iscsit_unmap_iovec(struct iscsi_cmd * cmd)940 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
941 {
942 u32 i;
943 struct scatterlist *sg;
944
945 sg = cmd->first_data_sg;
946
947 for (i = 0; i < cmd->kmapped_nents; i++)
948 kunmap(sg_page(&sg[i]));
949 }
950
iscsit_ack_from_expstatsn(struct iscsi_conn * conn,u32 exp_statsn)951 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
952 {
953 LIST_HEAD(ack_list);
954 struct iscsi_cmd *cmd, *cmd_p;
955
956 conn->exp_statsn = exp_statsn;
957
958 if (conn->sess->sess_ops->RDMAExtensions)
959 return;
960
961 spin_lock_bh(&conn->cmd_lock);
962 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
963 spin_lock(&cmd->istate_lock);
964 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
965 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
966 cmd->i_state = ISTATE_REMOVE;
967 spin_unlock(&cmd->istate_lock);
968 list_move_tail(&cmd->i_conn_node, &ack_list);
969 continue;
970 }
971 spin_unlock(&cmd->istate_lock);
972 }
973 spin_unlock_bh(&conn->cmd_lock);
974
975 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
976 list_del_init(&cmd->i_conn_node);
977 iscsit_free_cmd(cmd, false);
978 }
979 }
980
iscsit_allocate_iovecs(struct iscsi_cmd * cmd)981 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
982 {
983 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
984
985 iov_count += ISCSI_IOV_DATA_BUFFER;
986 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
987 if (!cmd->iov_data)
988 return -ENOMEM;
989
990 cmd->orig_iov_data_count = iov_count;
991 return 0;
992 }
993
iscsit_setup_scsi_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)994 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
995 unsigned char *buf)
996 {
997 int data_direction, payload_length;
998 struct iscsi_scsi_req *hdr;
999 int iscsi_task_attr;
1000 int sam_task_attr;
1001
1002 atomic_long_inc(&conn->sess->cmd_pdus);
1003
1004 hdr = (struct iscsi_scsi_req *) buf;
1005 payload_length = ntoh24(hdr->dlength);
1006
1007 /* FIXME; Add checks for AdditionalHeaderSegment */
1008
1009 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1010 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1011 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1012 " not set. Bad iSCSI Initiator.\n");
1013 return iscsit_add_reject_cmd(cmd,
1014 ISCSI_REASON_BOOKMARK_INVALID, buf);
1015 }
1016
1017 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1018 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1019 /*
1020 * From RFC-3720 Section 10.3.1:
1021 *
1022 * "Either or both of R and W MAY be 1 when either the
1023 * Expected Data Transfer Length and/or Bidirectional Read
1024 * Expected Data Transfer Length are 0"
1025 *
1026 * For this case, go ahead and clear the unnecssary bits
1027 * to avoid any confusion with ->data_direction.
1028 */
1029 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1030 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1031
1032 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1033 " set when Expected Data Transfer Length is 0 for"
1034 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1035 }
1036
1037 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1038 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1039 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1040 " MUST be set if Expected Data Transfer Length is not 0."
1041 " Bad iSCSI Initiator\n");
1042 return iscsit_add_reject_cmd(cmd,
1043 ISCSI_REASON_BOOKMARK_INVALID, buf);
1044 }
1045
1046 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1047 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1048 pr_err("Bidirectional operations not supported!\n");
1049 return iscsit_add_reject_cmd(cmd,
1050 ISCSI_REASON_BOOKMARK_INVALID, buf);
1051 }
1052
1053 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1054 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1055 " Scsi Command PDU.\n");
1056 return iscsit_add_reject_cmd(cmd,
1057 ISCSI_REASON_BOOKMARK_INVALID, buf);
1058 }
1059
1060 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1061 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1062 " protocol error.\n", payload_length);
1063 return iscsit_add_reject_cmd(cmd,
1064 ISCSI_REASON_PROTOCOL_ERROR, buf);
1065 }
1066
1067 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1068 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1069 pr_err("Expected Data Transfer Length and Length of"
1070 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1071 " bit is not set protocol error\n");
1072 return iscsit_add_reject_cmd(cmd,
1073 ISCSI_REASON_PROTOCOL_ERROR, buf);
1074 }
1075
1076 if (payload_length > be32_to_cpu(hdr->data_length)) {
1077 pr_err("DataSegmentLength: %u is greater than"
1078 " EDTL: %u, protocol error.\n", payload_length,
1079 hdr->data_length);
1080 return iscsit_add_reject_cmd(cmd,
1081 ISCSI_REASON_PROTOCOL_ERROR, buf);
1082 }
1083
1084 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1085 pr_err("DataSegmentLength: %u is greater than"
1086 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1087 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1088 return iscsit_add_reject_cmd(cmd,
1089 ISCSI_REASON_PROTOCOL_ERROR, buf);
1090 }
1091
1092 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1093 pr_err("DataSegmentLength: %u is greater than"
1094 " FirstBurstLength: %u, protocol error.\n",
1095 payload_length, conn->sess->sess_ops->FirstBurstLength);
1096 return iscsit_add_reject_cmd(cmd,
1097 ISCSI_REASON_BOOKMARK_INVALID, buf);
1098 }
1099
1100 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1101 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1102 DMA_NONE;
1103
1104 cmd->data_direction = data_direction;
1105 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1106 /*
1107 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1108 */
1109 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1110 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1111 sam_task_attr = TCM_SIMPLE_TAG;
1112 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1113 sam_task_attr = TCM_ORDERED_TAG;
1114 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1115 sam_task_attr = TCM_HEAD_TAG;
1116 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1117 sam_task_attr = TCM_ACA_TAG;
1118 else {
1119 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1120 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1121 sam_task_attr = TCM_SIMPLE_TAG;
1122 }
1123
1124 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1125 cmd->i_state = ISTATE_NEW_CMD;
1126 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1127 cmd->immediate_data = (payload_length) ? 1 : 0;
1128 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1129 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1130 if (cmd->unsolicited_data)
1131 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1132
1133 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1134 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1135 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1136 else
1137 cmd->targ_xfer_tag = 0xFFFFFFFF;
1138 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1139 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1140 cmd->first_burst_len = payload_length;
1141
1142 if (!conn->sess->sess_ops->RDMAExtensions &&
1143 cmd->data_direction == DMA_FROM_DEVICE) {
1144 struct iscsi_datain_req *dr;
1145
1146 dr = iscsit_allocate_datain_req();
1147 if (!dr)
1148 return iscsit_add_reject_cmd(cmd,
1149 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1150
1151 iscsit_attach_datain_req(cmd, dr);
1152 }
1153
1154 /*
1155 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1156 */
1157 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1158 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1159 cmd->data_direction, sam_task_attr,
1160 cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun));
1161
1162 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1163 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1164 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1165 conn->cid);
1166
1167 target_get_sess_cmd(&cmd->se_cmd, true);
1168
1169 cmd->sense_reason = target_cmd_init_cdb(&cmd->se_cmd, hdr->cdb);
1170 if (cmd->sense_reason) {
1171 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1172 return iscsit_add_reject_cmd(cmd,
1173 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1174 }
1175
1176 goto attach_cmd;
1177 }
1178
1179 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd);
1180 if (cmd->sense_reason)
1181 goto attach_cmd;
1182
1183 /* only used for printks or comparing with ->ref_task_tag */
1184 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1185 cmd->sense_reason = target_cmd_parse_cdb(&cmd->se_cmd);
1186 if (cmd->sense_reason)
1187 goto attach_cmd;
1188
1189 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1190 return iscsit_add_reject_cmd(cmd,
1191 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1192 }
1193
1194 attach_cmd:
1195 spin_lock_bh(&conn->cmd_lock);
1196 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1197 spin_unlock_bh(&conn->cmd_lock);
1198 /*
1199 * Check if we need to delay processing because of ALUA
1200 * Active/NonOptimized primary access state..
1201 */
1202 core_alua_check_nonop_delay(&cmd->se_cmd);
1203
1204 return 0;
1205 }
1206 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1207
iscsit_set_unsolicited_dataout(struct iscsi_cmd * cmd)1208 void iscsit_set_unsolicited_dataout(struct iscsi_cmd *cmd)
1209 {
1210 iscsit_set_dataout_sequence_values(cmd);
1211
1212 spin_lock_bh(&cmd->dataout_timeout_lock);
1213 iscsit_start_dataout_timer(cmd, cmd->conn);
1214 spin_unlock_bh(&cmd->dataout_timeout_lock);
1215 }
1216 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout);
1217
iscsit_process_scsi_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_scsi_req * hdr)1218 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1219 struct iscsi_scsi_req *hdr)
1220 {
1221 int cmdsn_ret = 0;
1222 /*
1223 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1224 * the Immediate Bit is not set, and no Immediate
1225 * Data is attached.
1226 *
1227 * A PDU/CmdSN carrying Immediate Data can only
1228 * be processed after the DataCRC has passed.
1229 * If the DataCRC fails, the CmdSN MUST NOT
1230 * be acknowledged. (See below)
1231 */
1232 if (!cmd->immediate_data) {
1233 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1234 (unsigned char *)hdr, hdr->cmdsn);
1235 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1236 return -1;
1237 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1238 target_put_sess_cmd(&cmd->se_cmd);
1239 return 0;
1240 }
1241 }
1242
1243 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1244
1245 /*
1246 * If no Immediate Data is attached, it's OK to return now.
1247 */
1248 if (!cmd->immediate_data) {
1249 if (!cmd->sense_reason && cmd->unsolicited_data)
1250 iscsit_set_unsolicited_dataout(cmd);
1251 if (!cmd->sense_reason)
1252 return 0;
1253
1254 target_put_sess_cmd(&cmd->se_cmd);
1255 return 0;
1256 }
1257
1258 /*
1259 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1260 * execution. These exceptions are processed in CmdSN order using
1261 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1262 */
1263 if (cmd->sense_reason)
1264 return 1;
1265 /*
1266 * Call directly into transport_generic_new_cmd() to perform
1267 * the backend memory allocation.
1268 */
1269 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1270 if (cmd->sense_reason)
1271 return 1;
1272
1273 return 0;
1274 }
1275 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1276
1277 static int
iscsit_get_immediate_data(struct iscsi_cmd * cmd,struct iscsi_scsi_req * hdr,bool dump_payload)1278 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1279 bool dump_payload)
1280 {
1281 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1282 int rc;
1283
1284 /*
1285 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1286 */
1287 if (dump_payload) {
1288 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done,
1289 cmd->first_burst_len);
1290
1291 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n",
1292 cmd->se_cmd.data_length, cmd->write_data_done,
1293 cmd->first_burst_len, length);
1294 rc = iscsit_dump_data_payload(cmd->conn, length, 1);
1295 pr_debug("Finished dumping immediate data\n");
1296 if (rc < 0)
1297 immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER;
1298 } else {
1299 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1300 cmd->first_burst_len);
1301 }
1302
1303 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1304 /*
1305 * A PDU/CmdSN carrying Immediate Data passed
1306 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1307 * Immediate Bit is not set.
1308 */
1309 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1310 (unsigned char *)hdr, hdr->cmdsn);
1311 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1312 return -1;
1313
1314 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1315 target_put_sess_cmd(&cmd->se_cmd);
1316
1317 return 0;
1318 } else if (cmd->unsolicited_data)
1319 iscsit_set_unsolicited_dataout(cmd);
1320
1321 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1322 /*
1323 * Immediate Data failed DataCRC and ERL>=1,
1324 * silently drop this PDU and let the initiator
1325 * plug the CmdSN gap.
1326 *
1327 * FIXME: Send Unsolicited NOPIN with reserved
1328 * TTT here to help the initiator figure out
1329 * the missing CmdSN, although they should be
1330 * intelligent enough to determine the missing
1331 * CmdSN and issue a retry to plug the sequence.
1332 */
1333 cmd->i_state = ISTATE_REMOVE;
1334 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1335 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1336 return -1;
1337
1338 return 0;
1339 }
1340
1341 static int
iscsit_handle_scsi_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)1342 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1343 unsigned char *buf)
1344 {
1345 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1346 int rc, immed_data;
1347 bool dump_payload = false;
1348
1349 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1350 if (rc < 0)
1351 return 0;
1352 /*
1353 * Allocation iovecs needed for struct socket operations for
1354 * traditional iSCSI block I/O.
1355 */
1356 if (iscsit_allocate_iovecs(cmd) < 0) {
1357 return iscsit_reject_cmd(cmd,
1358 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1359 }
1360 immed_data = cmd->immediate_data;
1361
1362 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1363 if (rc < 0)
1364 return rc;
1365 else if (rc > 0)
1366 dump_payload = true;
1367
1368 if (!immed_data)
1369 return 0;
1370
1371 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1372 }
1373
iscsit_do_crypto_hash_sg(struct ahash_request * hash,struct iscsi_cmd * cmd,u32 data_offset,u32 data_length,u32 padding,u8 * pad_bytes)1374 static u32 iscsit_do_crypto_hash_sg(
1375 struct ahash_request *hash,
1376 struct iscsi_cmd *cmd,
1377 u32 data_offset,
1378 u32 data_length,
1379 u32 padding,
1380 u8 *pad_bytes)
1381 {
1382 u32 data_crc;
1383 struct scatterlist *sg;
1384 unsigned int page_off;
1385
1386 crypto_ahash_init(hash);
1387
1388 sg = cmd->first_data_sg;
1389 page_off = cmd->first_data_sg_off;
1390
1391 if (data_length && page_off) {
1392 struct scatterlist first_sg;
1393 u32 len = min_t(u32, data_length, sg->length - page_off);
1394
1395 sg_init_table(&first_sg, 1);
1396 sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off);
1397
1398 ahash_request_set_crypt(hash, &first_sg, NULL, len);
1399 crypto_ahash_update(hash);
1400
1401 data_length -= len;
1402 sg = sg_next(sg);
1403 }
1404
1405 while (data_length) {
1406 u32 cur_len = min_t(u32, data_length, sg->length);
1407
1408 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1409 crypto_ahash_update(hash);
1410
1411 data_length -= cur_len;
1412 /* iscsit_map_iovec has already checked for invalid sg pointers */
1413 sg = sg_next(sg);
1414 }
1415
1416 if (padding) {
1417 struct scatterlist pad_sg;
1418
1419 sg_init_one(&pad_sg, pad_bytes, padding);
1420 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1421 padding);
1422 crypto_ahash_finup(hash);
1423 } else {
1424 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1425 crypto_ahash_final(hash);
1426 }
1427
1428 return data_crc;
1429 }
1430
iscsit_do_crypto_hash_buf(struct ahash_request * hash,const void * buf,u32 payload_length,u32 padding,const void * pad_bytes,void * data_crc)1431 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1432 const void *buf, u32 payload_length, u32 padding,
1433 const void *pad_bytes, void *data_crc)
1434 {
1435 struct scatterlist sg[2];
1436
1437 sg_init_table(sg, ARRAY_SIZE(sg));
1438 sg_set_buf(sg, buf, payload_length);
1439 if (padding)
1440 sg_set_buf(sg + 1, pad_bytes, padding);
1441
1442 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1443
1444 crypto_ahash_digest(hash);
1445 }
1446
1447 int
__iscsit_check_dataout_hdr(struct iscsi_conn * conn,void * buf,struct iscsi_cmd * cmd,u32 payload_length,bool * success)1448 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1449 struct iscsi_cmd *cmd, u32 payload_length,
1450 bool *success)
1451 {
1452 struct iscsi_data *hdr = buf;
1453 struct se_cmd *se_cmd;
1454 int rc;
1455
1456 /* iSCSI write */
1457 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1458
1459 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1460 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1461 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1462 payload_length, conn->cid);
1463
1464 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1465 pr_err("Command ITT: 0x%08x received DataOUT after"
1466 " last DataOUT received, dumping payload\n",
1467 cmd->init_task_tag);
1468 return iscsit_dump_data_payload(conn, payload_length, 1);
1469 }
1470
1471 if (cmd->data_direction != DMA_TO_DEVICE) {
1472 pr_err("Command ITT: 0x%08x received DataOUT for a"
1473 " NON-WRITE command.\n", cmd->init_task_tag);
1474 return iscsit_dump_data_payload(conn, payload_length, 1);
1475 }
1476 se_cmd = &cmd->se_cmd;
1477 iscsit_mod_dataout_timer(cmd);
1478
1479 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1480 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1481 be32_to_cpu(hdr->offset), payload_length,
1482 cmd->se_cmd.data_length);
1483 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1484 }
1485
1486 if (cmd->unsolicited_data) {
1487 int dump_unsolicited_data = 0;
1488
1489 if (conn->sess->sess_ops->InitialR2T) {
1490 pr_err("Received unexpected unsolicited data"
1491 " while InitialR2T=Yes, protocol error.\n");
1492 transport_send_check_condition_and_sense(&cmd->se_cmd,
1493 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1494 return -1;
1495 }
1496 /*
1497 * Special case for dealing with Unsolicited DataOUT
1498 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1499 * failures;
1500 */
1501
1502 /* Something's amiss if we're not in WRITE_PENDING state... */
1503 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1504 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1505 dump_unsolicited_data = 1;
1506
1507 if (dump_unsolicited_data) {
1508 /*
1509 * Check if a delayed TASK_ABORTED status needs to
1510 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1511 * received with the unsolicited data out.
1512 */
1513 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1514 iscsit_stop_dataout_timer(cmd);
1515
1516 return iscsit_dump_data_payload(conn, payload_length, 1);
1517 }
1518 } else {
1519 /*
1520 * For the normal solicited data path:
1521 *
1522 * Check for a delayed TASK_ABORTED status and dump any
1523 * incoming data out payload if one exists. Also, when the
1524 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1525 * data out sequence, we decrement outstanding_r2ts. Once
1526 * outstanding_r2ts reaches zero, go ahead and send the delayed
1527 * TASK_ABORTED status.
1528 */
1529 if (se_cmd->transport_state & CMD_T_ABORTED) {
1530 if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1531 --cmd->outstanding_r2ts < 1)
1532 iscsit_stop_dataout_timer(cmd);
1533
1534 return iscsit_dump_data_payload(conn, payload_length, 1);
1535 }
1536 }
1537 /*
1538 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1539 * within-command recovery checks before receiving the payload.
1540 */
1541 rc = iscsit_check_pre_dataout(cmd, buf);
1542 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1543 return 0;
1544 else if (rc == DATAOUT_CANNOT_RECOVER)
1545 return -1;
1546 *success = true;
1547 return 0;
1548 }
1549 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1550
1551 int
iscsit_check_dataout_hdr(struct iscsi_conn * conn,void * buf,struct iscsi_cmd ** out_cmd)1552 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1553 struct iscsi_cmd **out_cmd)
1554 {
1555 struct iscsi_data *hdr = buf;
1556 struct iscsi_cmd *cmd;
1557 u32 payload_length = ntoh24(hdr->dlength);
1558 int rc;
1559 bool success = false;
1560
1561 if (!payload_length) {
1562 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1563 return 0;
1564 }
1565
1566 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1567 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1568 " MaxXmitDataSegmentLength: %u\n", payload_length,
1569 conn->conn_ops->MaxXmitDataSegmentLength);
1570 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1571 }
1572
1573 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1574 if (!cmd)
1575 return 0;
1576
1577 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1578
1579 if (success)
1580 *out_cmd = cmd;
1581
1582 return rc;
1583 }
1584 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1585
1586 static int
iscsit_get_dataout(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_data * hdr)1587 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1588 struct iscsi_data *hdr)
1589 {
1590 struct kvec *iov;
1591 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1592 u32 payload_length;
1593 int iov_ret, data_crc_failed = 0;
1594
1595 payload_length = min_t(u32, cmd->se_cmd.data_length,
1596 ntoh24(hdr->dlength));
1597 rx_size += payload_length;
1598 iov = &cmd->iov_data[0];
1599
1600 iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2,
1601 be32_to_cpu(hdr->offset), payload_length);
1602 if (iov_ret < 0)
1603 return -1;
1604
1605 iov_count += iov_ret;
1606
1607 padding = ((-payload_length) & 3);
1608 if (padding != 0) {
1609 iov[iov_count].iov_base = cmd->pad_bytes;
1610 iov[iov_count++].iov_len = padding;
1611 rx_size += padding;
1612 pr_debug("Receiving %u padding bytes.\n", padding);
1613 }
1614
1615 if (conn->conn_ops->DataDigest) {
1616 iov[iov_count].iov_base = &checksum;
1617 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1618 rx_size += ISCSI_CRC_LEN;
1619 }
1620
1621 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
1622 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1623
1624 iscsit_unmap_iovec(cmd);
1625
1626 if (rx_got != rx_size)
1627 return -1;
1628
1629 if (conn->conn_ops->DataDigest) {
1630 u32 data_crc;
1631
1632 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1633 be32_to_cpu(hdr->offset),
1634 payload_length, padding,
1635 cmd->pad_bytes);
1636
1637 if (checksum != data_crc) {
1638 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1639 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1640 " does not match computed 0x%08x\n",
1641 hdr->itt, hdr->offset, payload_length,
1642 hdr->datasn, checksum, data_crc);
1643 data_crc_failed = 1;
1644 } else {
1645 pr_debug("Got CRC32C DataDigest 0x%08x for"
1646 " %u bytes of Data Out\n", checksum,
1647 payload_length);
1648 }
1649 }
1650
1651 return data_crc_failed;
1652 }
1653
1654 int
iscsit_check_dataout_payload(struct iscsi_cmd * cmd,struct iscsi_data * hdr,bool data_crc_failed)1655 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1656 bool data_crc_failed)
1657 {
1658 struct iscsi_conn *conn = cmd->conn;
1659 int rc, ooo_cmdsn;
1660 /*
1661 * Increment post receive data and CRC values or perform
1662 * within-command recovery.
1663 */
1664 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1665 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1666 return 0;
1667 else if (rc == DATAOUT_SEND_R2T) {
1668 iscsit_set_dataout_sequence_values(cmd);
1669 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1670 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1671 /*
1672 * Handle extra special case for out of order
1673 * Unsolicited Data Out.
1674 */
1675 spin_lock_bh(&cmd->istate_lock);
1676 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1677 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1678 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1679 spin_unlock_bh(&cmd->istate_lock);
1680
1681 iscsit_stop_dataout_timer(cmd);
1682 if (ooo_cmdsn)
1683 return 0;
1684 target_execute_cmd(&cmd->se_cmd);
1685 return 0;
1686 } else /* DATAOUT_CANNOT_RECOVER */
1687 return -1;
1688
1689 return 0;
1690 }
1691 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1692
iscsit_handle_data_out(struct iscsi_conn * conn,unsigned char * buf)1693 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1694 {
1695 struct iscsi_cmd *cmd = NULL;
1696 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1697 int rc;
1698 bool data_crc_failed = false;
1699
1700 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1701 if (rc < 0)
1702 return 0;
1703 else if (!cmd)
1704 return 0;
1705
1706 rc = iscsit_get_dataout(conn, cmd, hdr);
1707 if (rc < 0)
1708 return rc;
1709 else if (rc > 0)
1710 data_crc_failed = true;
1711
1712 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1713 }
1714
iscsit_setup_nop_out(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_nopout * hdr)1715 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1716 struct iscsi_nopout *hdr)
1717 {
1718 u32 payload_length = ntoh24(hdr->dlength);
1719
1720 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1721 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1722 if (!cmd)
1723 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1724 (unsigned char *)hdr);
1725
1726 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1727 (unsigned char *)hdr);
1728 }
1729
1730 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1731 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1732 " not set, protocol error.\n");
1733 if (!cmd)
1734 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1735 (unsigned char *)hdr);
1736
1737 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1738 (unsigned char *)hdr);
1739 }
1740
1741 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1742 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1743 " greater than MaxXmitDataSegmentLength: %u, protocol"
1744 " error.\n", payload_length,
1745 conn->conn_ops->MaxXmitDataSegmentLength);
1746 if (!cmd)
1747 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1748 (unsigned char *)hdr);
1749
1750 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1751 (unsigned char *)hdr);
1752 }
1753
1754 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1755 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1756 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1757 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1758 payload_length);
1759 /*
1760 * This is not a response to a Unsolicited NopIN, which means
1761 * it can either be a NOPOUT ping request (with a valid ITT),
1762 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1763 * Either way, make sure we allocate an struct iscsi_cmd, as both
1764 * can contain ping data.
1765 */
1766 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1767 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1768 cmd->i_state = ISTATE_SEND_NOPIN;
1769 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1770 1 : 0);
1771 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1772 cmd->targ_xfer_tag = 0xFFFFFFFF;
1773 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1774 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1775 cmd->data_direction = DMA_NONE;
1776 }
1777
1778 return 0;
1779 }
1780 EXPORT_SYMBOL(iscsit_setup_nop_out);
1781
iscsit_process_nop_out(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_nopout * hdr)1782 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1783 struct iscsi_nopout *hdr)
1784 {
1785 struct iscsi_cmd *cmd_p = NULL;
1786 int cmdsn_ret = 0;
1787 /*
1788 * Initiator is expecting a NopIN ping reply..
1789 */
1790 if (hdr->itt != RESERVED_ITT) {
1791 if (!cmd)
1792 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1793 (unsigned char *)hdr);
1794
1795 spin_lock_bh(&conn->cmd_lock);
1796 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1797 spin_unlock_bh(&conn->cmd_lock);
1798
1799 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1800
1801 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1802 iscsit_add_cmd_to_response_queue(cmd, conn,
1803 cmd->i_state);
1804 return 0;
1805 }
1806
1807 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1808 (unsigned char *)hdr, hdr->cmdsn);
1809 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1810 return 0;
1811 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1812 return -1;
1813
1814 return 0;
1815 }
1816 /*
1817 * This was a response to a unsolicited NOPIN ping.
1818 */
1819 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1820 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1821 if (!cmd_p)
1822 return -EINVAL;
1823
1824 iscsit_stop_nopin_response_timer(conn);
1825
1826 cmd_p->i_state = ISTATE_REMOVE;
1827 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1828
1829 iscsit_start_nopin_timer(conn);
1830 return 0;
1831 }
1832 /*
1833 * Otherwise, initiator is not expecting a NOPIN is response.
1834 * Just ignore for now.
1835 */
1836
1837 if (cmd)
1838 iscsit_free_cmd(cmd, false);
1839
1840 return 0;
1841 }
1842 EXPORT_SYMBOL(iscsit_process_nop_out);
1843
iscsit_handle_nop_out(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)1844 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1845 unsigned char *buf)
1846 {
1847 unsigned char *ping_data = NULL;
1848 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1849 struct kvec *iov = NULL;
1850 u32 payload_length = ntoh24(hdr->dlength);
1851 int ret;
1852
1853 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1854 if (ret < 0)
1855 return 0;
1856 /*
1857 * Handle NOP-OUT payload for traditional iSCSI sockets
1858 */
1859 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1860 u32 checksum, data_crc, padding = 0;
1861 int niov = 0, rx_got, rx_size = payload_length;
1862
1863 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1864 if (!ping_data) {
1865 ret = -1;
1866 goto out;
1867 }
1868
1869 iov = &cmd->iov_misc[0];
1870 iov[niov].iov_base = ping_data;
1871 iov[niov++].iov_len = payload_length;
1872
1873 padding = ((-payload_length) & 3);
1874 if (padding != 0) {
1875 pr_debug("Receiving %u additional bytes"
1876 " for padding.\n", padding);
1877 iov[niov].iov_base = &cmd->pad_bytes;
1878 iov[niov++].iov_len = padding;
1879 rx_size += padding;
1880 }
1881 if (conn->conn_ops->DataDigest) {
1882 iov[niov].iov_base = &checksum;
1883 iov[niov++].iov_len = ISCSI_CRC_LEN;
1884 rx_size += ISCSI_CRC_LEN;
1885 }
1886
1887 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc));
1888 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1889 if (rx_got != rx_size) {
1890 ret = -1;
1891 goto out;
1892 }
1893
1894 if (conn->conn_ops->DataDigest) {
1895 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1896 payload_length, padding,
1897 cmd->pad_bytes, &data_crc);
1898
1899 if (checksum != data_crc) {
1900 pr_err("Ping data CRC32C DataDigest"
1901 " 0x%08x does not match computed 0x%08x\n",
1902 checksum, data_crc);
1903 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1904 pr_err("Unable to recover from"
1905 " NOPOUT Ping DataCRC failure while in"
1906 " ERL=0.\n");
1907 ret = -1;
1908 goto out;
1909 } else {
1910 /*
1911 * Silently drop this PDU and let the
1912 * initiator plug the CmdSN gap.
1913 */
1914 pr_debug("Dropping NOPOUT"
1915 " Command CmdSN: 0x%08x due to"
1916 " DataCRC error.\n", hdr->cmdsn);
1917 ret = 0;
1918 goto out;
1919 }
1920 } else {
1921 pr_debug("Got CRC32C DataDigest"
1922 " 0x%08x for %u bytes of ping data.\n",
1923 checksum, payload_length);
1924 }
1925 }
1926
1927 ping_data[payload_length] = '\0';
1928 /*
1929 * Attach ping data to struct iscsi_cmd->buf_ptr.
1930 */
1931 cmd->buf_ptr = ping_data;
1932 cmd->buf_ptr_size = payload_length;
1933
1934 pr_debug("Got %u bytes of NOPOUT ping"
1935 " data.\n", payload_length);
1936 pr_debug("Ping Data: \"%s\"\n", ping_data);
1937 }
1938
1939 return iscsit_process_nop_out(conn, cmd, hdr);
1940 out:
1941 if (cmd)
1942 iscsit_free_cmd(cmd, false);
1943
1944 kfree(ping_data);
1945 return ret;
1946 }
1947
iscsit_convert_tmf(u8 iscsi_tmf)1948 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1949 {
1950 switch (iscsi_tmf) {
1951 case ISCSI_TM_FUNC_ABORT_TASK:
1952 return TMR_ABORT_TASK;
1953 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1954 return TMR_ABORT_TASK_SET;
1955 case ISCSI_TM_FUNC_CLEAR_ACA:
1956 return TMR_CLEAR_ACA;
1957 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1958 return TMR_CLEAR_TASK_SET;
1959 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1960 return TMR_LUN_RESET;
1961 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1962 return TMR_TARGET_WARM_RESET;
1963 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1964 return TMR_TARGET_COLD_RESET;
1965 default:
1966 return TMR_UNKNOWN;
1967 }
1968 }
1969
1970 int
iscsit_handle_task_mgt_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)1971 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1972 unsigned char *buf)
1973 {
1974 struct se_tmr_req *se_tmr;
1975 struct iscsi_tmr_req *tmr_req;
1976 struct iscsi_tm *hdr;
1977 int out_of_order_cmdsn = 0, ret;
1978 u8 function, tcm_function = TMR_UNKNOWN;
1979
1980 hdr = (struct iscsi_tm *) buf;
1981 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1982 function = hdr->flags;
1983
1984 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1985 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1986 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1987 hdr->rtt, hdr->refcmdsn, conn->cid);
1988
1989 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1990 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1991 hdr->rtt != RESERVED_ITT)) {
1992 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1993 hdr->rtt = RESERVED_ITT;
1994 }
1995
1996 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1997 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1998 pr_err("Task Management Request TASK_REASSIGN not"
1999 " issued as immediate command, bad iSCSI Initiator"
2000 "implementation\n");
2001 return iscsit_add_reject_cmd(cmd,
2002 ISCSI_REASON_PROTOCOL_ERROR, buf);
2003 }
2004 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2005 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
2006 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
2007
2008 cmd->data_direction = DMA_NONE;
2009 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
2010 if (!cmd->tmr_req) {
2011 return iscsit_add_reject_cmd(cmd,
2012 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2013 buf);
2014 }
2015
2016 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2017 conn->sess->se_sess, 0, DMA_NONE,
2018 TCM_SIMPLE_TAG, cmd->sense_buffer + 2,
2019 scsilun_to_int(&hdr->lun));
2020
2021 target_get_sess_cmd(&cmd->se_cmd, true);
2022
2023 /*
2024 * TASK_REASSIGN for ERL=2 / connection stays inside of
2025 * LIO-Target $FABRIC_MOD
2026 */
2027 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2028 tcm_function = iscsit_convert_tmf(function);
2029 if (tcm_function == TMR_UNKNOWN) {
2030 pr_err("Unknown iSCSI TMR Function:"
2031 " 0x%02x\n", function);
2032 return iscsit_add_reject_cmd(cmd,
2033 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2034 }
2035 }
2036 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2037 GFP_KERNEL);
2038 if (ret < 0)
2039 return iscsit_add_reject_cmd(cmd,
2040 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2041
2042 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2043
2044 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2045 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2046 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2047 cmd->init_task_tag = hdr->itt;
2048 cmd->targ_xfer_tag = 0xFFFFFFFF;
2049 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2050 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2051 se_tmr = cmd->se_cmd.se_tmr_req;
2052 tmr_req = cmd->tmr_req;
2053 /*
2054 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2055 */
2056 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2057 ret = transport_lookup_tmr_lun(&cmd->se_cmd);
2058 if (ret < 0) {
2059 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2060 goto attach;
2061 }
2062 }
2063
2064 switch (function) {
2065 case ISCSI_TM_FUNC_ABORT_TASK:
2066 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2067 if (se_tmr->response)
2068 goto attach;
2069 break;
2070 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2071 case ISCSI_TM_FUNC_CLEAR_ACA:
2072 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2073 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2074 break;
2075 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2076 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2077 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2078 goto attach;
2079 }
2080 break;
2081 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2082 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2083 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2084 goto attach;
2085 }
2086 break;
2087 case ISCSI_TM_FUNC_TASK_REASSIGN:
2088 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2089 /*
2090 * Perform sanity checks on the ExpDataSN only if the
2091 * TASK_REASSIGN was successful.
2092 */
2093 if (se_tmr->response)
2094 break;
2095
2096 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2097 return iscsit_add_reject_cmd(cmd,
2098 ISCSI_REASON_BOOKMARK_INVALID, buf);
2099 break;
2100 default:
2101 pr_err("Unknown TMR function: 0x%02x, protocol"
2102 " error.\n", function);
2103 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2104 goto attach;
2105 }
2106
2107 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2108 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2109 se_tmr->call_transport = 1;
2110 attach:
2111 spin_lock_bh(&conn->cmd_lock);
2112 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2113 spin_unlock_bh(&conn->cmd_lock);
2114
2115 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2116 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2117 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2118 out_of_order_cmdsn = 1;
2119 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2120 target_put_sess_cmd(&cmd->se_cmd);
2121 return 0;
2122 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2123 return -1;
2124 }
2125 }
2126 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2127
2128 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2129 return 0;
2130 /*
2131 * Found the referenced task, send to transport for processing.
2132 */
2133 if (se_tmr->call_transport)
2134 return transport_generic_handle_tmr(&cmd->se_cmd);
2135
2136 /*
2137 * Could not find the referenced LUN, task, or Task Management
2138 * command not authorized or supported. Change state and
2139 * let the tx_thread send the response.
2140 *
2141 * For connection recovery, this is also the default action for
2142 * TMR TASK_REASSIGN.
2143 */
2144 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2145 target_put_sess_cmd(&cmd->se_cmd);
2146 return 0;
2147 }
2148 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2149
2150 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2151 int
iscsit_setup_text_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_text * hdr)2152 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2153 struct iscsi_text *hdr)
2154 {
2155 u32 payload_length = ntoh24(hdr->dlength);
2156
2157 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2158 pr_err("Unable to accept text parameter length: %u"
2159 "greater than MaxXmitDataSegmentLength %u.\n",
2160 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2161 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2162 (unsigned char *)hdr);
2163 }
2164
2165 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2166 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2167 pr_err("Multi sequence text commands currently not supported\n");
2168 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2169 (unsigned char *)hdr);
2170 }
2171
2172 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2173 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2174 hdr->exp_statsn, payload_length);
2175
2176 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2177 cmd->i_state = ISTATE_SEND_TEXTRSP;
2178 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2179 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2180 cmd->targ_xfer_tag = 0xFFFFFFFF;
2181 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2182 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2183 cmd->data_direction = DMA_NONE;
2184 kfree(cmd->text_in_ptr);
2185 cmd->text_in_ptr = NULL;
2186
2187 return 0;
2188 }
2189 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2190
2191 int
iscsit_process_text_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_text * hdr)2192 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2193 struct iscsi_text *hdr)
2194 {
2195 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2196 int cmdsn_ret;
2197
2198 if (!text_in) {
2199 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2200 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2201 pr_err("Unable to locate text_in buffer for sendtargets"
2202 " discovery\n");
2203 goto reject;
2204 }
2205 goto empty_sendtargets;
2206 }
2207 if (strncmp("SendTargets=", text_in, 12) != 0) {
2208 pr_err("Received Text Data that is not"
2209 " SendTargets, cannot continue.\n");
2210 goto reject;
2211 }
2212 /* '=' confirmed in strncmp */
2213 text_ptr = strchr(text_in, '=');
2214 BUG_ON(!text_ptr);
2215 if (!strncmp("=All", text_ptr, 5)) {
2216 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2217 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2218 !strncmp("=eui.", text_ptr, 5)) {
2219 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2220 } else {
2221 pr_err("Unable to locate valid SendTargets%s value\n",
2222 text_ptr);
2223 goto reject;
2224 }
2225
2226 spin_lock_bh(&conn->cmd_lock);
2227 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2228 spin_unlock_bh(&conn->cmd_lock);
2229
2230 empty_sendtargets:
2231 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2232
2233 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2234 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2235 (unsigned char *)hdr, hdr->cmdsn);
2236 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2237 return -1;
2238
2239 return 0;
2240 }
2241
2242 return iscsit_execute_cmd(cmd, 0);
2243
2244 reject:
2245 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2246 (unsigned char *)hdr);
2247 }
2248 EXPORT_SYMBOL(iscsit_process_text_cmd);
2249
2250 static int
iscsit_handle_text_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)2251 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2252 unsigned char *buf)
2253 {
2254 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2255 char *text_in = NULL;
2256 u32 payload_length = ntoh24(hdr->dlength);
2257 int rx_size, rc;
2258
2259 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2260 if (rc < 0)
2261 return 0;
2262
2263 rx_size = payload_length;
2264 if (payload_length) {
2265 u32 checksum = 0, data_crc = 0;
2266 u32 padding = 0;
2267 int niov = 0, rx_got;
2268 struct kvec iov[2];
2269
2270 rx_size = ALIGN(payload_length, 4);
2271 text_in = kzalloc(rx_size, GFP_KERNEL);
2272 if (!text_in)
2273 goto reject;
2274
2275 cmd->text_in_ptr = text_in;
2276
2277 memset(iov, 0, sizeof(iov));
2278 iov[niov].iov_base = text_in;
2279 iov[niov++].iov_len = rx_size;
2280
2281 padding = rx_size - payload_length;
2282 if (padding)
2283 pr_debug("Receiving %u additional bytes"
2284 " for padding.\n", padding);
2285 if (conn->conn_ops->DataDigest) {
2286 iov[niov].iov_base = &checksum;
2287 iov[niov++].iov_len = ISCSI_CRC_LEN;
2288 rx_size += ISCSI_CRC_LEN;
2289 }
2290
2291 WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
2292 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2293 if (rx_got != rx_size)
2294 goto reject;
2295
2296 if (conn->conn_ops->DataDigest) {
2297 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2298 text_in, rx_size, 0, NULL,
2299 &data_crc);
2300
2301 if (checksum != data_crc) {
2302 pr_err("Text data CRC32C DataDigest"
2303 " 0x%08x does not match computed"
2304 " 0x%08x\n", checksum, data_crc);
2305 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2306 pr_err("Unable to recover from"
2307 " Text Data digest failure while in"
2308 " ERL=0.\n");
2309 goto reject;
2310 } else {
2311 /*
2312 * Silently drop this PDU and let the
2313 * initiator plug the CmdSN gap.
2314 */
2315 pr_debug("Dropping Text"
2316 " Command CmdSN: 0x%08x due to"
2317 " DataCRC error.\n", hdr->cmdsn);
2318 kfree(text_in);
2319 return 0;
2320 }
2321 } else {
2322 pr_debug("Got CRC32C DataDigest"
2323 " 0x%08x for %u bytes of text data.\n",
2324 checksum, payload_length);
2325 }
2326 }
2327 text_in[payload_length - 1] = '\0';
2328 pr_debug("Successfully read %d bytes of text"
2329 " data.\n", payload_length);
2330 }
2331
2332 return iscsit_process_text_cmd(conn, cmd, hdr);
2333
2334 reject:
2335 kfree(cmd->text_in_ptr);
2336 cmd->text_in_ptr = NULL;
2337 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2338 }
2339
iscsit_logout_closesession(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2340 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2341 {
2342 struct iscsi_conn *conn_p;
2343 struct iscsi_session *sess = conn->sess;
2344
2345 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2346 " for SID: %u.\n", conn->cid, conn->sess->sid);
2347
2348 atomic_set(&sess->session_logout, 1);
2349 atomic_set(&conn->conn_logout_remove, 1);
2350 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2351
2352 iscsit_inc_conn_usage_count(conn);
2353 iscsit_inc_session_usage_count(sess);
2354
2355 spin_lock_bh(&sess->conn_lock);
2356 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2357 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2358 continue;
2359
2360 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2361 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2362 }
2363 spin_unlock_bh(&sess->conn_lock);
2364
2365 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2366
2367 return 0;
2368 }
2369
iscsit_logout_closeconnection(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2370 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2371 {
2372 struct iscsi_conn *l_conn;
2373 struct iscsi_session *sess = conn->sess;
2374
2375 pr_debug("Received logout request CLOSECONNECTION for CID:"
2376 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2377
2378 /*
2379 * A Logout Request with a CLOSECONNECTION reason code for a CID
2380 * can arrive on a connection with a differing CID.
2381 */
2382 if (conn->cid == cmd->logout_cid) {
2383 spin_lock_bh(&conn->state_lock);
2384 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2385 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2386
2387 atomic_set(&conn->conn_logout_remove, 1);
2388 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2389 iscsit_inc_conn_usage_count(conn);
2390
2391 spin_unlock_bh(&conn->state_lock);
2392 } else {
2393 /*
2394 * Handle all different cid CLOSECONNECTION requests in
2395 * iscsit_logout_post_handler_diffcid() as to give enough
2396 * time for any non immediate command's CmdSN to be
2397 * acknowledged on the connection in question.
2398 *
2399 * Here we simply make sure the CID is still around.
2400 */
2401 l_conn = iscsit_get_conn_from_cid(sess,
2402 cmd->logout_cid);
2403 if (!l_conn) {
2404 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2405 iscsit_add_cmd_to_response_queue(cmd, conn,
2406 cmd->i_state);
2407 return 0;
2408 }
2409
2410 iscsit_dec_conn_usage_count(l_conn);
2411 }
2412
2413 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2414
2415 return 0;
2416 }
2417
iscsit_logout_removeconnforrecovery(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2418 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2419 {
2420 struct iscsi_session *sess = conn->sess;
2421
2422 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2423 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2424
2425 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2426 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2427 " while ERL!=2.\n");
2428 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2429 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2430 return 0;
2431 }
2432
2433 if (conn->cid == cmd->logout_cid) {
2434 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2435 " with CID: %hu on CID: %hu, implementation error.\n",
2436 cmd->logout_cid, conn->cid);
2437 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2438 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2439 return 0;
2440 }
2441
2442 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2443
2444 return 0;
2445 }
2446
2447 int
iscsit_handle_logout_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)2448 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2449 unsigned char *buf)
2450 {
2451 int cmdsn_ret, logout_remove = 0;
2452 u8 reason_code = 0;
2453 struct iscsi_logout *hdr;
2454 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2455
2456 hdr = (struct iscsi_logout *) buf;
2457 reason_code = (hdr->flags & 0x7f);
2458
2459 if (tiqn) {
2460 spin_lock(&tiqn->logout_stats.lock);
2461 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2462 tiqn->logout_stats.normal_logouts++;
2463 else
2464 tiqn->logout_stats.abnormal_logouts++;
2465 spin_unlock(&tiqn->logout_stats.lock);
2466 }
2467
2468 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2469 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2470 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2471 hdr->cid, conn->cid);
2472
2473 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2474 pr_err("Received logout request on connection that"
2475 " is not in logged in state, ignoring request.\n");
2476 iscsit_free_cmd(cmd, false);
2477 return 0;
2478 }
2479
2480 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2481 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2482 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2483 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2484 cmd->targ_xfer_tag = 0xFFFFFFFF;
2485 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2486 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2487 cmd->logout_cid = be16_to_cpu(hdr->cid);
2488 cmd->logout_reason = reason_code;
2489 cmd->data_direction = DMA_NONE;
2490
2491 /*
2492 * We need to sleep in these cases (by returning 1) until the Logout
2493 * Response gets sent in the tx thread.
2494 */
2495 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2496 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2497 be16_to_cpu(hdr->cid) == conn->cid))
2498 logout_remove = 1;
2499
2500 spin_lock_bh(&conn->cmd_lock);
2501 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2502 spin_unlock_bh(&conn->cmd_lock);
2503
2504 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2505 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2506
2507 /*
2508 * Immediate commands are executed, well, immediately.
2509 * Non-Immediate Logout Commands are executed in CmdSN order.
2510 */
2511 if (cmd->immediate_cmd) {
2512 int ret = iscsit_execute_cmd(cmd, 0);
2513
2514 if (ret < 0)
2515 return ret;
2516 } else {
2517 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2518 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2519 logout_remove = 0;
2520 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2521 return -1;
2522 }
2523
2524 return logout_remove;
2525 }
2526 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2527
iscsit_handle_snack(struct iscsi_conn * conn,unsigned char * buf)2528 int iscsit_handle_snack(
2529 struct iscsi_conn *conn,
2530 unsigned char *buf)
2531 {
2532 struct iscsi_snack *hdr;
2533
2534 hdr = (struct iscsi_snack *) buf;
2535 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2536
2537 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2538 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2539 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2540 hdr->begrun, hdr->runlength, conn->cid);
2541
2542 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2543 pr_err("Initiator sent SNACK request while in"
2544 " ErrorRecoveryLevel=0.\n");
2545 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2546 buf);
2547 }
2548 /*
2549 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2550 * call from inside iscsi_send_recovery_datain_or_r2t().
2551 */
2552 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2553 case 0:
2554 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2555 hdr->itt,
2556 be32_to_cpu(hdr->ttt),
2557 be32_to_cpu(hdr->begrun),
2558 be32_to_cpu(hdr->runlength));
2559 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2560 return iscsit_handle_status_snack(conn, hdr->itt,
2561 be32_to_cpu(hdr->ttt),
2562 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2563 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2564 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2565 be32_to_cpu(hdr->begrun),
2566 be32_to_cpu(hdr->runlength));
2567 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2568 /* FIXME: Support R-Data SNACK */
2569 pr_err("R-Data SNACK Not Supported.\n");
2570 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2571 buf);
2572 default:
2573 pr_err("Unknown SNACK type 0x%02x, protocol"
2574 " error.\n", hdr->flags & 0x0f);
2575 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2576 buf);
2577 }
2578
2579 return 0;
2580 }
2581 EXPORT_SYMBOL(iscsit_handle_snack);
2582
iscsit_rx_thread_wait_for_tcp(struct iscsi_conn * conn)2583 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2584 {
2585 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2586 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2587 wait_for_completion_interruptible_timeout(
2588 &conn->rx_half_close_comp,
2589 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2590 }
2591 }
2592
iscsit_handle_immediate_data(struct iscsi_cmd * cmd,struct iscsi_scsi_req * hdr,u32 length)2593 static int iscsit_handle_immediate_data(
2594 struct iscsi_cmd *cmd,
2595 struct iscsi_scsi_req *hdr,
2596 u32 length)
2597 {
2598 int iov_ret, rx_got = 0, rx_size = 0;
2599 u32 checksum, iov_count = 0, padding = 0;
2600 struct iscsi_conn *conn = cmd->conn;
2601 struct kvec *iov;
2602 void *overflow_buf = NULL;
2603
2604 BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
2605 rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
2606 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
2607 cmd->orig_iov_data_count - 2,
2608 cmd->write_data_done, rx_size);
2609 if (iov_ret < 0)
2610 return IMMEDIATE_DATA_CANNOT_RECOVER;
2611
2612 iov_count = iov_ret;
2613 iov = &cmd->iov_data[0];
2614 if (rx_size < length) {
2615 /*
2616 * Special case: length of immediate data exceeds the data
2617 * buffer size derived from the CDB.
2618 */
2619 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
2620 if (!overflow_buf) {
2621 iscsit_unmap_iovec(cmd);
2622 return IMMEDIATE_DATA_CANNOT_RECOVER;
2623 }
2624 cmd->overflow_buf = overflow_buf;
2625 iov[iov_count].iov_base = overflow_buf;
2626 iov[iov_count].iov_len = length - rx_size;
2627 iov_count++;
2628 rx_size = length;
2629 }
2630
2631 padding = ((-length) & 3);
2632 if (padding != 0) {
2633 iov[iov_count].iov_base = cmd->pad_bytes;
2634 iov[iov_count++].iov_len = padding;
2635 rx_size += padding;
2636 }
2637
2638 if (conn->conn_ops->DataDigest) {
2639 iov[iov_count].iov_base = &checksum;
2640 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2641 rx_size += ISCSI_CRC_LEN;
2642 }
2643
2644 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
2645 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2646
2647 iscsit_unmap_iovec(cmd);
2648
2649 if (rx_got != rx_size) {
2650 iscsit_rx_thread_wait_for_tcp(conn);
2651 return IMMEDIATE_DATA_CANNOT_RECOVER;
2652 }
2653
2654 if (conn->conn_ops->DataDigest) {
2655 u32 data_crc;
2656
2657 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2658 cmd->write_data_done, length, padding,
2659 cmd->pad_bytes);
2660
2661 if (checksum != data_crc) {
2662 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2663 " does not match computed 0x%08x\n", checksum,
2664 data_crc);
2665
2666 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2667 pr_err("Unable to recover from"
2668 " Immediate Data digest failure while"
2669 " in ERL=0.\n");
2670 iscsit_reject_cmd(cmd,
2671 ISCSI_REASON_DATA_DIGEST_ERROR,
2672 (unsigned char *)hdr);
2673 return IMMEDIATE_DATA_CANNOT_RECOVER;
2674 } else {
2675 iscsit_reject_cmd(cmd,
2676 ISCSI_REASON_DATA_DIGEST_ERROR,
2677 (unsigned char *)hdr);
2678 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2679 }
2680 } else {
2681 pr_debug("Got CRC32C DataDigest 0x%08x for"
2682 " %u bytes of Immediate Data\n", checksum,
2683 length);
2684 }
2685 }
2686
2687 cmd->write_data_done += length;
2688
2689 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2690 spin_lock_bh(&cmd->istate_lock);
2691 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2692 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2693 spin_unlock_bh(&cmd->istate_lock);
2694 }
2695
2696 return IMMEDIATE_DATA_NORMAL_OPERATION;
2697 }
2698
2699 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2700 with active network interface */
iscsit_build_conn_drop_async_message(struct iscsi_conn * conn)2701 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2702 {
2703 struct iscsi_cmd *cmd;
2704 struct iscsi_conn *conn_p;
2705 bool found = false;
2706
2707 lockdep_assert_held(&conn->sess->conn_lock);
2708
2709 /*
2710 * Only send a Asynchronous Message on connections whos network
2711 * interface is still functional.
2712 */
2713 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2714 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2715 iscsit_inc_conn_usage_count(conn_p);
2716 found = true;
2717 break;
2718 }
2719 }
2720
2721 if (!found)
2722 return;
2723
2724 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2725 if (!cmd) {
2726 iscsit_dec_conn_usage_count(conn_p);
2727 return;
2728 }
2729
2730 cmd->logout_cid = conn->cid;
2731 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2732 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2733
2734 spin_lock_bh(&conn_p->cmd_lock);
2735 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2736 spin_unlock_bh(&conn_p->cmd_lock);
2737
2738 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2739 iscsit_dec_conn_usage_count(conn_p);
2740 }
2741
iscsit_send_conn_drop_async_message(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2742 static int iscsit_send_conn_drop_async_message(
2743 struct iscsi_cmd *cmd,
2744 struct iscsi_conn *conn)
2745 {
2746 struct iscsi_async *hdr;
2747
2748 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2749
2750 hdr = (struct iscsi_async *) cmd->pdu;
2751 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2752 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2753 cmd->init_task_tag = RESERVED_ITT;
2754 cmd->targ_xfer_tag = 0xFFFFFFFF;
2755 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2756 cmd->stat_sn = conn->stat_sn++;
2757 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2758 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2759 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2760 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2761 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2762 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2763 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2764
2765 pr_debug("Sending Connection Dropped Async Message StatSN:"
2766 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2767 cmd->logout_cid, conn->cid);
2768
2769 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2770 }
2771
iscsit_tx_thread_wait_for_tcp(struct iscsi_conn * conn)2772 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2773 {
2774 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2775 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2776 wait_for_completion_interruptible_timeout(
2777 &conn->tx_half_close_comp,
2778 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2779 }
2780 }
2781
2782 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)2783 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2784 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2785 bool set_statsn)
2786 {
2787 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2788 hdr->flags = datain->flags;
2789 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2790 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2791 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2792 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2793 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2794 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2795 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2796 }
2797 }
2798 hton24(hdr->dlength, datain->length);
2799 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2800 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2801 (struct scsi_lun *)&hdr->lun);
2802 else
2803 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2804
2805 hdr->itt = cmd->init_task_tag;
2806
2807 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2808 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2809 else
2810 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2811 if (set_statsn)
2812 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2813 else
2814 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2815
2816 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2817 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2818 hdr->datasn = cpu_to_be32(datain->data_sn);
2819 hdr->offset = cpu_to_be32(datain->offset);
2820
2821 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2822 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2823 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2824 ntohl(hdr->offset), datain->length, conn->cid);
2825 }
2826 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2827
iscsit_send_datain(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2828 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2829 {
2830 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2831 struct iscsi_datain datain;
2832 struct iscsi_datain_req *dr;
2833 int eodr = 0, ret;
2834 bool set_statsn = false;
2835
2836 memset(&datain, 0, sizeof(struct iscsi_datain));
2837 dr = iscsit_get_datain_values(cmd, &datain);
2838 if (!dr) {
2839 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2840 cmd->init_task_tag);
2841 return -1;
2842 }
2843 /*
2844 * Be paranoid and double check the logic for now.
2845 */
2846 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2847 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2848 " datain.length: %u exceeds cmd->data_length: %u\n",
2849 cmd->init_task_tag, datain.offset, datain.length,
2850 cmd->se_cmd.data_length);
2851 return -1;
2852 }
2853
2854 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2855 /*
2856 * Special case for successfully execution w/ both DATAIN
2857 * and Sense Data.
2858 */
2859 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2860 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2861 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2862 else {
2863 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2864 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2865 iscsit_increment_maxcmdsn(cmd, conn->sess);
2866 cmd->stat_sn = conn->stat_sn++;
2867 set_statsn = true;
2868 } else if (dr->dr_complete ==
2869 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2870 set_statsn = true;
2871 }
2872
2873 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2874
2875 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2876 if (ret < 0)
2877 return ret;
2878
2879 if (dr->dr_complete) {
2880 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2881 2 : 1;
2882 iscsit_free_datain_req(cmd, dr);
2883 }
2884
2885 return eodr;
2886 }
2887
2888 int
iscsit_build_logout_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_logout_rsp * hdr)2889 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2890 struct iscsi_logout_rsp *hdr)
2891 {
2892 struct iscsi_conn *logout_conn = NULL;
2893 struct iscsi_conn_recovery *cr = NULL;
2894 struct iscsi_session *sess = conn->sess;
2895 /*
2896 * The actual shutting down of Sessions and/or Connections
2897 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2898 * is done in scsi_logout_post_handler().
2899 */
2900 switch (cmd->logout_reason) {
2901 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2902 pr_debug("iSCSI session logout successful, setting"
2903 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2904 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2905 break;
2906 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2907 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2908 break;
2909 /*
2910 * For CLOSECONNECTION logout requests carrying
2911 * a matching logout CID -> local CID, the reference
2912 * for the local CID will have been incremented in
2913 * iscsi_logout_closeconnection().
2914 *
2915 * For CLOSECONNECTION logout requests carrying
2916 * a different CID than the connection it arrived
2917 * on, the connection responding to cmd->logout_cid
2918 * is stopped in iscsit_logout_post_handler_diffcid().
2919 */
2920
2921 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2922 " successful.\n", cmd->logout_cid, conn->cid);
2923 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2924 break;
2925 case ISCSI_LOGOUT_REASON_RECOVERY:
2926 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2927 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2928 break;
2929 /*
2930 * If the connection is still active from our point of view
2931 * force connection recovery to occur.
2932 */
2933 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2934 cmd->logout_cid);
2935 if (logout_conn) {
2936 iscsit_connection_reinstatement_rcfr(logout_conn);
2937 iscsit_dec_conn_usage_count(logout_conn);
2938 }
2939
2940 cr = iscsit_get_inactive_connection_recovery_entry(
2941 conn->sess, cmd->logout_cid);
2942 if (!cr) {
2943 pr_err("Unable to locate CID: %hu for"
2944 " REMOVECONNFORRECOVERY Logout Request.\n",
2945 cmd->logout_cid);
2946 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2947 break;
2948 }
2949
2950 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2951
2952 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2953 " for recovery for CID: %hu on CID: %hu successful.\n",
2954 cmd->logout_cid, conn->cid);
2955 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2956 break;
2957 default:
2958 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2959 cmd->logout_reason);
2960 return -1;
2961 }
2962
2963 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2964 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2965 hdr->response = cmd->logout_response;
2966 hdr->itt = cmd->init_task_tag;
2967 cmd->stat_sn = conn->stat_sn++;
2968 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2969
2970 iscsit_increment_maxcmdsn(cmd, conn->sess);
2971 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2972 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2973
2974 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2975 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2976 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2977 cmd->logout_cid, conn->cid);
2978
2979 return 0;
2980 }
2981 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2982
2983 static int
iscsit_send_logout(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2984 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2985 {
2986 int rc;
2987
2988 rc = iscsit_build_logout_rsp(cmd, conn,
2989 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2990 if (rc < 0)
2991 return rc;
2992
2993 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2994 }
2995
2996 void
iscsit_build_nopin_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_nopin * hdr,bool nopout_response)2997 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2998 struct iscsi_nopin *hdr, bool nopout_response)
2999 {
3000 hdr->opcode = ISCSI_OP_NOOP_IN;
3001 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3002 hton24(hdr->dlength, cmd->buf_ptr_size);
3003 if (nopout_response)
3004 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
3005 hdr->itt = cmd->init_task_tag;
3006 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3007 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
3008 conn->stat_sn;
3009 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3010
3011 if (nopout_response)
3012 iscsit_increment_maxcmdsn(cmd, conn->sess);
3013
3014 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3015 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3016
3017 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3018 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3019 "Solicited" : "Unsolicited", cmd->init_task_tag,
3020 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3021 }
3022 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3023
3024 /*
3025 * Unsolicited NOPIN, either requesting a response or not.
3026 */
iscsit_send_unsolicited_nopin(struct iscsi_cmd * cmd,struct iscsi_conn * conn,int want_response)3027 static int iscsit_send_unsolicited_nopin(
3028 struct iscsi_cmd *cmd,
3029 struct iscsi_conn *conn,
3030 int want_response)
3031 {
3032 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3033 int ret;
3034
3035 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3036
3037 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3038 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3039
3040 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3041 if (ret < 0)
3042 return ret;
3043
3044 spin_lock_bh(&cmd->istate_lock);
3045 cmd->i_state = want_response ?
3046 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3047 spin_unlock_bh(&cmd->istate_lock);
3048
3049 return 0;
3050 }
3051
3052 static int
iscsit_send_nopin(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3053 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3054 {
3055 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3056
3057 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3058
3059 /*
3060 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3061 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3062 */
3063 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3064
3065 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3066 cmd->buf_ptr,
3067 cmd->buf_ptr_size);
3068 }
3069
iscsit_send_r2t(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3070 static int iscsit_send_r2t(
3071 struct iscsi_cmd *cmd,
3072 struct iscsi_conn *conn)
3073 {
3074 struct iscsi_r2t *r2t;
3075 struct iscsi_r2t_rsp *hdr;
3076 int ret;
3077
3078 r2t = iscsit_get_r2t_from_list(cmd);
3079 if (!r2t)
3080 return -1;
3081
3082 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3083 memset(hdr, 0, ISCSI_HDR_LEN);
3084 hdr->opcode = ISCSI_OP_R2T;
3085 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3086 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3087 (struct scsi_lun *)&hdr->lun);
3088 hdr->itt = cmd->init_task_tag;
3089 if (conn->conn_transport->iscsit_get_r2t_ttt)
3090 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3091 else
3092 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3093 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3094 hdr->statsn = cpu_to_be32(conn->stat_sn);
3095 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3096 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3097 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3098 hdr->data_offset = cpu_to_be32(r2t->offset);
3099 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3100
3101 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3102 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3103 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3104 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3105 r2t->offset, r2t->xfer_len, conn->cid);
3106
3107 spin_lock_bh(&cmd->r2t_lock);
3108 r2t->sent_r2t = 1;
3109 spin_unlock_bh(&cmd->r2t_lock);
3110
3111 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3112 if (ret < 0) {
3113 return ret;
3114 }
3115
3116 spin_lock_bh(&cmd->dataout_timeout_lock);
3117 iscsit_start_dataout_timer(cmd, conn);
3118 spin_unlock_bh(&cmd->dataout_timeout_lock);
3119
3120 return 0;
3121 }
3122
3123 /*
3124 * @recovery: If called from iscsi_task_reassign_complete_write() for
3125 * connection recovery.
3126 */
iscsit_build_r2ts_for_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,bool recovery)3127 int iscsit_build_r2ts_for_cmd(
3128 struct iscsi_conn *conn,
3129 struct iscsi_cmd *cmd,
3130 bool recovery)
3131 {
3132 int first_r2t = 1;
3133 u32 offset = 0, xfer_len = 0;
3134
3135 spin_lock_bh(&cmd->r2t_lock);
3136 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3137 spin_unlock_bh(&cmd->r2t_lock);
3138 return 0;
3139 }
3140
3141 if (conn->sess->sess_ops->DataSequenceInOrder &&
3142 !recovery)
3143 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3144
3145 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3146 if (conn->sess->sess_ops->DataSequenceInOrder) {
3147 offset = cmd->r2t_offset;
3148
3149 if (first_r2t && recovery) {
3150 int new_data_end = offset +
3151 conn->sess->sess_ops->MaxBurstLength -
3152 cmd->next_burst_len;
3153
3154 if (new_data_end > cmd->se_cmd.data_length)
3155 xfer_len = cmd->se_cmd.data_length - offset;
3156 else
3157 xfer_len =
3158 conn->sess->sess_ops->MaxBurstLength -
3159 cmd->next_burst_len;
3160 } else {
3161 int new_data_end = offset +
3162 conn->sess->sess_ops->MaxBurstLength;
3163
3164 if (new_data_end > cmd->se_cmd.data_length)
3165 xfer_len = cmd->se_cmd.data_length - offset;
3166 else
3167 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3168 }
3169
3170 if ((s32)xfer_len < 0) {
3171 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3172 break;
3173 }
3174
3175 cmd->r2t_offset += xfer_len;
3176
3177 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3178 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3179 } else {
3180 struct iscsi_seq *seq;
3181
3182 seq = iscsit_get_seq_holder_for_r2t(cmd);
3183 if (!seq) {
3184 spin_unlock_bh(&cmd->r2t_lock);
3185 return -1;
3186 }
3187
3188 offset = seq->offset;
3189 xfer_len = seq->xfer_len;
3190
3191 if (cmd->seq_send_order == cmd->seq_count)
3192 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3193 }
3194 cmd->outstanding_r2ts++;
3195 first_r2t = 0;
3196
3197 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3198 spin_unlock_bh(&cmd->r2t_lock);
3199 return -1;
3200 }
3201
3202 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3203 break;
3204 }
3205 spin_unlock_bh(&cmd->r2t_lock);
3206
3207 return 0;
3208 }
3209 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3210
iscsit_build_rsp_pdu(struct iscsi_cmd * cmd,struct iscsi_conn * conn,bool inc_stat_sn,struct iscsi_scsi_rsp * hdr)3211 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3212 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3213 {
3214 if (inc_stat_sn)
3215 cmd->stat_sn = conn->stat_sn++;
3216
3217 atomic_long_inc(&conn->sess->rsp_pdus);
3218
3219 memset(hdr, 0, ISCSI_HDR_LEN);
3220 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3221 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3222 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3223 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3224 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3225 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3226 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3227 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3228 }
3229 hdr->response = cmd->iscsi_response;
3230 hdr->cmd_status = cmd->se_cmd.scsi_status;
3231 hdr->itt = cmd->init_task_tag;
3232 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3233
3234 iscsit_increment_maxcmdsn(cmd, conn->sess);
3235 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3236 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3237
3238 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3239 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3240 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3241 cmd->se_cmd.scsi_status, conn->cid);
3242 }
3243 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3244
iscsit_send_response(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3245 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3246 {
3247 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3248 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3249 void *data_buf = NULL;
3250 u32 padding = 0, data_buf_len = 0;
3251
3252 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3253
3254 /*
3255 * Attach SENSE DATA payload to iSCSI Response PDU
3256 */
3257 if (cmd->se_cmd.sense_buffer &&
3258 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3259 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3260 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3261 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3262
3263 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3264 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3265 data_buf = cmd->sense_buffer;
3266 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3267
3268 if (padding) {
3269 memset(cmd->sense_buffer +
3270 cmd->se_cmd.scsi_sense_length, 0, padding);
3271 pr_debug("Adding %u bytes of padding to"
3272 " SENSE.\n", padding);
3273 }
3274
3275 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3276 " Response PDU\n",
3277 cmd->se_cmd.scsi_sense_length);
3278 }
3279
3280 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3281 data_buf_len);
3282 }
3283
iscsit_convert_tcm_tmr_rsp(struct se_tmr_req * se_tmr)3284 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3285 {
3286 switch (se_tmr->response) {
3287 case TMR_FUNCTION_COMPLETE:
3288 return ISCSI_TMF_RSP_COMPLETE;
3289 case TMR_TASK_DOES_NOT_EXIST:
3290 return ISCSI_TMF_RSP_NO_TASK;
3291 case TMR_LUN_DOES_NOT_EXIST:
3292 return ISCSI_TMF_RSP_NO_LUN;
3293 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3294 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3295 case TMR_FUNCTION_REJECTED:
3296 default:
3297 return ISCSI_TMF_RSP_REJECTED;
3298 }
3299 }
3300
3301 void
iscsit_build_task_mgt_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_tm_rsp * hdr)3302 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3303 struct iscsi_tm_rsp *hdr)
3304 {
3305 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3306
3307 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3308 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3309 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3310 hdr->itt = cmd->init_task_tag;
3311 cmd->stat_sn = conn->stat_sn++;
3312 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3313
3314 iscsit_increment_maxcmdsn(cmd, conn->sess);
3315 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3316 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3317
3318 pr_debug("Built Task Management Response ITT: 0x%08x,"
3319 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3320 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3321 }
3322 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3323
3324 static int
iscsit_send_task_mgt_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3325 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3326 {
3327 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3328
3329 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3330
3331 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3332 }
3333
3334 #define SENDTARGETS_BUF_LIMIT 32768U
3335
3336 static int
iscsit_build_sendtargets_response(struct iscsi_cmd * cmd,enum iscsit_transport_type network_transport,int skip_bytes,bool * completed)3337 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3338 enum iscsit_transport_type network_transport,
3339 int skip_bytes, bool *completed)
3340 {
3341 char *payload = NULL;
3342 struct iscsi_conn *conn = cmd->conn;
3343 struct iscsi_portal_group *tpg;
3344 struct iscsi_tiqn *tiqn;
3345 struct iscsi_tpg_np *tpg_np;
3346 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3347 int target_name_printed;
3348 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3349 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3350 bool active;
3351
3352 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3353 SENDTARGETS_BUF_LIMIT);
3354
3355 payload = kzalloc(buffer_len, GFP_KERNEL);
3356 if (!payload)
3357 return -ENOMEM;
3358
3359 /*
3360 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3361 * explicit case..
3362 */
3363 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3364 text_ptr = strchr(text_in, '=');
3365 if (!text_ptr) {
3366 pr_err("Unable to locate '=' string in text_in:"
3367 " %s\n", text_in);
3368 kfree(payload);
3369 return -EINVAL;
3370 }
3371 /*
3372 * Skip over '=' character..
3373 */
3374 text_ptr += 1;
3375 }
3376
3377 spin_lock(&tiqn_lock);
3378 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3379 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3380 strcmp(tiqn->tiqn, text_ptr)) {
3381 continue;
3382 }
3383
3384 target_name_printed = 0;
3385
3386 spin_lock(&tiqn->tiqn_tpg_lock);
3387 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3388
3389 /* If demo_mode_discovery=0 and generate_node_acls=0
3390 * (demo mode dislabed) do not return
3391 * TargetName+TargetAddress unless a NodeACL exists.
3392 */
3393
3394 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3395 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3396 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3397 cmd->conn->sess->sess_ops->InitiatorName))) {
3398 continue;
3399 }
3400
3401 spin_lock(&tpg->tpg_state_lock);
3402 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3403 spin_unlock(&tpg->tpg_state_lock);
3404
3405 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3406 continue;
3407
3408 spin_lock(&tpg->tpg_np_lock);
3409 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3410 tpg_np_list) {
3411 struct iscsi_np *np = tpg_np->tpg_np;
3412 struct sockaddr_storage *sockaddr;
3413
3414 if (np->np_network_transport != network_transport)
3415 continue;
3416
3417 if (!target_name_printed) {
3418 len = sprintf(buf, "TargetName=%s",
3419 tiqn->tiqn);
3420 len += 1;
3421
3422 if ((len + payload_len) > buffer_len) {
3423 spin_unlock(&tpg->tpg_np_lock);
3424 spin_unlock(&tiqn->tiqn_tpg_lock);
3425 end_of_buf = 1;
3426 goto eob;
3427 }
3428
3429 if (skip_bytes && len <= skip_bytes) {
3430 skip_bytes -= len;
3431 } else {
3432 memcpy(payload + payload_len, buf, len);
3433 payload_len += len;
3434 target_name_printed = 1;
3435 if (len > skip_bytes)
3436 skip_bytes = 0;
3437 }
3438 }
3439
3440 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3441 sockaddr = &conn->local_sockaddr;
3442 else
3443 sockaddr = &np->np_sockaddr;
3444
3445 len = sprintf(buf, "TargetAddress="
3446 "%pISpc,%hu",
3447 sockaddr,
3448 tpg->tpgt);
3449 len += 1;
3450
3451 if ((len + payload_len) > buffer_len) {
3452 spin_unlock(&tpg->tpg_np_lock);
3453 spin_unlock(&tiqn->tiqn_tpg_lock);
3454 end_of_buf = 1;
3455 goto eob;
3456 }
3457
3458 if (skip_bytes && len <= skip_bytes) {
3459 skip_bytes -= len;
3460 } else {
3461 memcpy(payload + payload_len, buf, len);
3462 payload_len += len;
3463 if (len > skip_bytes)
3464 skip_bytes = 0;
3465 }
3466 }
3467 spin_unlock(&tpg->tpg_np_lock);
3468 }
3469 spin_unlock(&tiqn->tiqn_tpg_lock);
3470 eob:
3471 if (end_of_buf) {
3472 *completed = false;
3473 break;
3474 }
3475
3476 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3477 break;
3478 }
3479 spin_unlock(&tiqn_lock);
3480
3481 cmd->buf_ptr = payload;
3482
3483 return payload_len;
3484 }
3485
3486 int
iscsit_build_text_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_text_rsp * hdr,enum iscsit_transport_type network_transport)3487 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3488 struct iscsi_text_rsp *hdr,
3489 enum iscsit_transport_type network_transport)
3490 {
3491 int text_length, padding;
3492 bool completed = true;
3493
3494 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3495 cmd->read_data_done,
3496 &completed);
3497 if (text_length < 0)
3498 return text_length;
3499
3500 if (completed) {
3501 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3502 } else {
3503 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3504 cmd->read_data_done += text_length;
3505 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3506 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3507 }
3508 hdr->opcode = ISCSI_OP_TEXT_RSP;
3509 padding = ((-text_length) & 3);
3510 hton24(hdr->dlength, text_length);
3511 hdr->itt = cmd->init_task_tag;
3512 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3513 cmd->stat_sn = conn->stat_sn++;
3514 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3515
3516 iscsit_increment_maxcmdsn(cmd, conn->sess);
3517 /*
3518 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3519 * correctly increment MaxCmdSN for each response answering a
3520 * non immediate text request with a valid CmdSN.
3521 */
3522 cmd->maxcmdsn_inc = 0;
3523 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3524 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3525
3526 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3527 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3528 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3529 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3530 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3531
3532 return text_length + padding;
3533 }
3534 EXPORT_SYMBOL(iscsit_build_text_rsp);
3535
iscsit_send_text_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3536 static int iscsit_send_text_rsp(
3537 struct iscsi_cmd *cmd,
3538 struct iscsi_conn *conn)
3539 {
3540 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3541 int text_length;
3542
3543 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3544 conn->conn_transport->transport_type);
3545 if (text_length < 0)
3546 return text_length;
3547
3548 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3549 cmd->buf_ptr,
3550 text_length);
3551 }
3552
3553 void
iscsit_build_reject(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_reject * hdr)3554 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3555 struct iscsi_reject *hdr)
3556 {
3557 hdr->opcode = ISCSI_OP_REJECT;
3558 hdr->reason = cmd->reject_reason;
3559 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3560 hton24(hdr->dlength, ISCSI_HDR_LEN);
3561 hdr->ffffffff = cpu_to_be32(0xffffffff);
3562 cmd->stat_sn = conn->stat_sn++;
3563 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3564 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3565 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3566
3567 }
3568 EXPORT_SYMBOL(iscsit_build_reject);
3569
iscsit_send_reject(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3570 static int iscsit_send_reject(
3571 struct iscsi_cmd *cmd,
3572 struct iscsi_conn *conn)
3573 {
3574 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3575
3576 iscsit_build_reject(cmd, conn, hdr);
3577
3578 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3579 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3580
3581 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3582 cmd->buf_ptr,
3583 ISCSI_HDR_LEN);
3584 }
3585
iscsit_thread_get_cpumask(struct iscsi_conn * conn)3586 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3587 {
3588 int ord, cpu;
3589 /*
3590 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3591 * within iscsit_start_kthreads()
3592 *
3593 * Here we use bitmap_id to determine which CPU that this
3594 * iSCSI connection's RX/TX threads will be scheduled to
3595 * execute upon.
3596 */
3597 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3598 for_each_online_cpu(cpu) {
3599 if (ord-- == 0) {
3600 cpumask_set_cpu(cpu, conn->conn_cpumask);
3601 return;
3602 }
3603 }
3604 /*
3605 * This should never be reached..
3606 */
3607 dump_stack();
3608 cpumask_setall(conn->conn_cpumask);
3609 }
3610
3611 int
iscsit_immediate_queue(struct iscsi_conn * conn,struct iscsi_cmd * cmd,int state)3612 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3613 {
3614 int ret;
3615
3616 switch (state) {
3617 case ISTATE_SEND_R2T:
3618 ret = iscsit_send_r2t(cmd, conn);
3619 if (ret < 0)
3620 goto err;
3621 break;
3622 case ISTATE_REMOVE:
3623 spin_lock_bh(&conn->cmd_lock);
3624 list_del_init(&cmd->i_conn_node);
3625 spin_unlock_bh(&conn->cmd_lock);
3626
3627 iscsit_free_cmd(cmd, false);
3628 break;
3629 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3630 iscsit_mod_nopin_response_timer(conn);
3631 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3632 if (ret < 0)
3633 goto err;
3634 break;
3635 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3636 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3637 if (ret < 0)
3638 goto err;
3639 break;
3640 default:
3641 pr_err("Unknown Opcode: 0x%02x ITT:"
3642 " 0x%08x, i_state: %d on CID: %hu\n",
3643 cmd->iscsi_opcode, cmd->init_task_tag, state,
3644 conn->cid);
3645 goto err;
3646 }
3647
3648 return 0;
3649
3650 err:
3651 return -1;
3652 }
3653 EXPORT_SYMBOL(iscsit_immediate_queue);
3654
3655 static int
iscsit_handle_immediate_queue(struct iscsi_conn * conn)3656 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3657 {
3658 struct iscsit_transport *t = conn->conn_transport;
3659 struct iscsi_queue_req *qr;
3660 struct iscsi_cmd *cmd;
3661 u8 state;
3662 int ret;
3663
3664 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3665 atomic_set(&conn->check_immediate_queue, 0);
3666 cmd = qr->cmd;
3667 state = qr->state;
3668 kmem_cache_free(lio_qr_cache, qr);
3669
3670 ret = t->iscsit_immediate_queue(conn, cmd, state);
3671 if (ret < 0)
3672 return ret;
3673 }
3674
3675 return 0;
3676 }
3677
3678 int
iscsit_response_queue(struct iscsi_conn * conn,struct iscsi_cmd * cmd,int state)3679 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3680 {
3681 int ret;
3682
3683 check_rsp_state:
3684 switch (state) {
3685 case ISTATE_SEND_DATAIN:
3686 ret = iscsit_send_datain(cmd, conn);
3687 if (ret < 0)
3688 goto err;
3689 else if (!ret)
3690 /* more drs */
3691 goto check_rsp_state;
3692 else if (ret == 1) {
3693 /* all done */
3694 spin_lock_bh(&cmd->istate_lock);
3695 cmd->i_state = ISTATE_SENT_STATUS;
3696 spin_unlock_bh(&cmd->istate_lock);
3697
3698 if (atomic_read(&conn->check_immediate_queue))
3699 return 1;
3700
3701 return 0;
3702 } else if (ret == 2) {
3703 /* Still must send status,
3704 SCF_TRANSPORT_TASK_SENSE was set */
3705 spin_lock_bh(&cmd->istate_lock);
3706 cmd->i_state = ISTATE_SEND_STATUS;
3707 spin_unlock_bh(&cmd->istate_lock);
3708 state = ISTATE_SEND_STATUS;
3709 goto check_rsp_state;
3710 }
3711
3712 break;
3713 case ISTATE_SEND_STATUS:
3714 case ISTATE_SEND_STATUS_RECOVERY:
3715 ret = iscsit_send_response(cmd, conn);
3716 break;
3717 case ISTATE_SEND_LOGOUTRSP:
3718 ret = iscsit_send_logout(cmd, conn);
3719 break;
3720 case ISTATE_SEND_ASYNCMSG:
3721 ret = iscsit_send_conn_drop_async_message(
3722 cmd, conn);
3723 break;
3724 case ISTATE_SEND_NOPIN:
3725 ret = iscsit_send_nopin(cmd, conn);
3726 break;
3727 case ISTATE_SEND_REJECT:
3728 ret = iscsit_send_reject(cmd, conn);
3729 break;
3730 case ISTATE_SEND_TASKMGTRSP:
3731 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3732 if (ret != 0)
3733 break;
3734 ret = iscsit_tmr_post_handler(cmd, conn);
3735 if (ret != 0)
3736 iscsit_fall_back_to_erl0(conn->sess);
3737 break;
3738 case ISTATE_SEND_TEXTRSP:
3739 ret = iscsit_send_text_rsp(cmd, conn);
3740 break;
3741 default:
3742 pr_err("Unknown Opcode: 0x%02x ITT:"
3743 " 0x%08x, i_state: %d on CID: %hu\n",
3744 cmd->iscsi_opcode, cmd->init_task_tag,
3745 state, conn->cid);
3746 goto err;
3747 }
3748 if (ret < 0)
3749 goto err;
3750
3751 switch (state) {
3752 case ISTATE_SEND_LOGOUTRSP:
3753 if (!iscsit_logout_post_handler(cmd, conn))
3754 return -ECONNRESET;
3755 fallthrough;
3756 case ISTATE_SEND_STATUS:
3757 case ISTATE_SEND_ASYNCMSG:
3758 case ISTATE_SEND_NOPIN:
3759 case ISTATE_SEND_STATUS_RECOVERY:
3760 case ISTATE_SEND_TEXTRSP:
3761 case ISTATE_SEND_TASKMGTRSP:
3762 case ISTATE_SEND_REJECT:
3763 spin_lock_bh(&cmd->istate_lock);
3764 cmd->i_state = ISTATE_SENT_STATUS;
3765 spin_unlock_bh(&cmd->istate_lock);
3766 break;
3767 default:
3768 pr_err("Unknown Opcode: 0x%02x ITT:"
3769 " 0x%08x, i_state: %d on CID: %hu\n",
3770 cmd->iscsi_opcode, cmd->init_task_tag,
3771 cmd->i_state, conn->cid);
3772 goto err;
3773 }
3774
3775 if (atomic_read(&conn->check_immediate_queue))
3776 return 1;
3777
3778 return 0;
3779
3780 err:
3781 return -1;
3782 }
3783 EXPORT_SYMBOL(iscsit_response_queue);
3784
iscsit_handle_response_queue(struct iscsi_conn * conn)3785 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3786 {
3787 struct iscsit_transport *t = conn->conn_transport;
3788 struct iscsi_queue_req *qr;
3789 struct iscsi_cmd *cmd;
3790 u8 state;
3791 int ret;
3792
3793 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3794 cmd = qr->cmd;
3795 state = qr->state;
3796 kmem_cache_free(lio_qr_cache, qr);
3797
3798 ret = t->iscsit_response_queue(conn, cmd, state);
3799 if (ret == 1 || ret < 0)
3800 return ret;
3801 }
3802
3803 return 0;
3804 }
3805
iscsi_target_tx_thread(void * arg)3806 int iscsi_target_tx_thread(void *arg)
3807 {
3808 int ret = 0;
3809 struct iscsi_conn *conn = arg;
3810 bool conn_freed = false;
3811
3812 /*
3813 * Allow ourselves to be interrupted by SIGINT so that a
3814 * connection recovery / failure event can be triggered externally.
3815 */
3816 allow_signal(SIGINT);
3817
3818 while (!kthread_should_stop()) {
3819 /*
3820 * Ensure that both TX and RX per connection kthreads
3821 * are scheduled to run on the same CPU.
3822 */
3823 iscsit_thread_check_cpumask(conn, current, 1);
3824
3825 wait_event_interruptible(conn->queues_wq,
3826 !iscsit_conn_all_queues_empty(conn));
3827
3828 if (signal_pending(current))
3829 goto transport_err;
3830
3831 get_immediate:
3832 ret = iscsit_handle_immediate_queue(conn);
3833 if (ret < 0)
3834 goto transport_err;
3835
3836 ret = iscsit_handle_response_queue(conn);
3837 if (ret == 1) {
3838 goto get_immediate;
3839 } else if (ret == -ECONNRESET) {
3840 conn_freed = true;
3841 goto out;
3842 } else if (ret < 0) {
3843 goto transport_err;
3844 }
3845 }
3846
3847 transport_err:
3848 /*
3849 * Avoid the normal connection failure code-path if this connection
3850 * is still within LOGIN mode, and iscsi_np process context is
3851 * responsible for cleaning up the early connection failure.
3852 */
3853 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3854 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3855 out:
3856 if (!conn_freed) {
3857 while (!kthread_should_stop()) {
3858 msleep(100);
3859 }
3860 }
3861 return 0;
3862 }
3863
iscsi_target_rx_opcode(struct iscsi_conn * conn,unsigned char * buf)3864 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3865 {
3866 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3867 struct iscsi_cmd *cmd;
3868 int ret = 0;
3869
3870 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3871 case ISCSI_OP_SCSI_CMD:
3872 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3873 if (!cmd)
3874 goto reject;
3875
3876 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3877 break;
3878 case ISCSI_OP_SCSI_DATA_OUT:
3879 ret = iscsit_handle_data_out(conn, buf);
3880 break;
3881 case ISCSI_OP_NOOP_OUT:
3882 cmd = NULL;
3883 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3884 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3885 if (!cmd)
3886 goto reject;
3887 }
3888 ret = iscsit_handle_nop_out(conn, cmd, buf);
3889 break;
3890 case ISCSI_OP_SCSI_TMFUNC:
3891 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3892 if (!cmd)
3893 goto reject;
3894
3895 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3896 break;
3897 case ISCSI_OP_TEXT:
3898 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3899 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3900 if (!cmd)
3901 goto reject;
3902 } else {
3903 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3904 if (!cmd)
3905 goto reject;
3906 }
3907
3908 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3909 break;
3910 case ISCSI_OP_LOGOUT:
3911 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3912 if (!cmd)
3913 goto reject;
3914
3915 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3916 if (ret > 0)
3917 wait_for_completion_timeout(&conn->conn_logout_comp,
3918 SECONDS_FOR_LOGOUT_COMP * HZ);
3919 break;
3920 case ISCSI_OP_SNACK:
3921 ret = iscsit_handle_snack(conn, buf);
3922 break;
3923 default:
3924 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3925 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3926 pr_err("Cannot recover from unknown"
3927 " opcode while ERL=0, closing iSCSI connection.\n");
3928 return -1;
3929 }
3930 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3931 " closing iSCSI connection.\n");
3932 ret = -1;
3933 break;
3934 }
3935
3936 return ret;
3937 reject:
3938 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3939 }
3940
iscsi_target_check_conn_state(struct iscsi_conn * conn)3941 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3942 {
3943 bool ret;
3944
3945 spin_lock_bh(&conn->state_lock);
3946 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3947 spin_unlock_bh(&conn->state_lock);
3948
3949 return ret;
3950 }
3951
iscsit_get_rx_pdu(struct iscsi_conn * conn)3952 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3953 {
3954 int ret;
3955 u8 *buffer, opcode;
3956 u32 checksum = 0, digest = 0;
3957 struct kvec iov;
3958
3959 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3960 if (!buffer)
3961 return;
3962
3963 while (!kthread_should_stop()) {
3964 /*
3965 * Ensure that both TX and RX per connection kthreads
3966 * are scheduled to run on the same CPU.
3967 */
3968 iscsit_thread_check_cpumask(conn, current, 0);
3969
3970 memset(&iov, 0, sizeof(struct kvec));
3971
3972 iov.iov_base = buffer;
3973 iov.iov_len = ISCSI_HDR_LEN;
3974
3975 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3976 if (ret != ISCSI_HDR_LEN) {
3977 iscsit_rx_thread_wait_for_tcp(conn);
3978 break;
3979 }
3980
3981 if (conn->conn_ops->HeaderDigest) {
3982 iov.iov_base = &digest;
3983 iov.iov_len = ISCSI_CRC_LEN;
3984
3985 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3986 if (ret != ISCSI_CRC_LEN) {
3987 iscsit_rx_thread_wait_for_tcp(conn);
3988 break;
3989 }
3990
3991 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3992 ISCSI_HDR_LEN, 0, NULL,
3993 &checksum);
3994
3995 if (digest != checksum) {
3996 pr_err("HeaderDigest CRC32C failed,"
3997 " received 0x%08x, computed 0x%08x\n",
3998 digest, checksum);
3999 /*
4000 * Set the PDU to 0xff so it will intentionally
4001 * hit default in the switch below.
4002 */
4003 memset(buffer, 0xff, ISCSI_HDR_LEN);
4004 atomic_long_inc(&conn->sess->conn_digest_errors);
4005 } else {
4006 pr_debug("Got HeaderDigest CRC32C"
4007 " 0x%08x\n", checksum);
4008 }
4009 }
4010
4011 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4012 break;
4013
4014 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4015
4016 if (conn->sess->sess_ops->SessionType &&
4017 ((!(opcode & ISCSI_OP_TEXT)) ||
4018 (!(opcode & ISCSI_OP_LOGOUT)))) {
4019 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4020 " while in Discovery Session, rejecting.\n", opcode);
4021 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4022 buffer);
4023 break;
4024 }
4025
4026 ret = iscsi_target_rx_opcode(conn, buffer);
4027 if (ret < 0)
4028 break;
4029 }
4030
4031 kfree(buffer);
4032 }
4033
iscsi_target_rx_thread(void * arg)4034 int iscsi_target_rx_thread(void *arg)
4035 {
4036 int rc;
4037 struct iscsi_conn *conn = arg;
4038 bool conn_freed = false;
4039
4040 /*
4041 * Allow ourselves to be interrupted by SIGINT so that a
4042 * connection recovery / failure event can be triggered externally.
4043 */
4044 allow_signal(SIGINT);
4045 /*
4046 * Wait for iscsi_post_login_handler() to complete before allowing
4047 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4048 */
4049 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4050 if (rc < 0 || iscsi_target_check_conn_state(conn))
4051 goto out;
4052
4053 if (!conn->conn_transport->iscsit_get_rx_pdu)
4054 return 0;
4055
4056 conn->conn_transport->iscsit_get_rx_pdu(conn);
4057
4058 if (!signal_pending(current))
4059 atomic_set(&conn->transport_failed, 1);
4060 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4061
4062 out:
4063 if (!conn_freed) {
4064 while (!kthread_should_stop()) {
4065 msleep(100);
4066 }
4067 }
4068
4069 return 0;
4070 }
4071
iscsit_release_commands_from_conn(struct iscsi_conn * conn)4072 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4073 {
4074 LIST_HEAD(tmp_list);
4075 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4076 struct iscsi_session *sess = conn->sess;
4077 /*
4078 * We expect this function to only ever be called from either RX or TX
4079 * thread context via iscsit_close_connection() once the other context
4080 * has been reset -> returned sleeping pre-handler state.
4081 */
4082 spin_lock_bh(&conn->cmd_lock);
4083 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4084
4085 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4086 struct se_cmd *se_cmd = &cmd->se_cmd;
4087
4088 if (se_cmd->se_tfo != NULL) {
4089 spin_lock_irq(&se_cmd->t_state_lock);
4090 if (se_cmd->transport_state & CMD_T_ABORTED) {
4091 /*
4092 * LIO's abort path owns the cleanup for this,
4093 * so put it back on the list and let
4094 * aborted_task handle it.
4095 */
4096 list_move_tail(&cmd->i_conn_node,
4097 &conn->conn_cmd_list);
4098 } else {
4099 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4100 }
4101 spin_unlock_irq(&se_cmd->t_state_lock);
4102 }
4103 }
4104 spin_unlock_bh(&conn->cmd_lock);
4105
4106 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4107 list_del_init(&cmd->i_conn_node);
4108
4109 iscsit_increment_maxcmdsn(cmd, sess);
4110 iscsit_free_cmd(cmd, true);
4111
4112 }
4113 }
4114
iscsit_stop_timers_for_cmds(struct iscsi_conn * conn)4115 static void iscsit_stop_timers_for_cmds(
4116 struct iscsi_conn *conn)
4117 {
4118 struct iscsi_cmd *cmd;
4119
4120 spin_lock_bh(&conn->cmd_lock);
4121 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4122 if (cmd->data_direction == DMA_TO_DEVICE)
4123 iscsit_stop_dataout_timer(cmd);
4124 }
4125 spin_unlock_bh(&conn->cmd_lock);
4126 }
4127
iscsit_close_connection(struct iscsi_conn * conn)4128 int iscsit_close_connection(
4129 struct iscsi_conn *conn)
4130 {
4131 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4132 struct iscsi_session *sess = conn->sess;
4133
4134 pr_debug("Closing iSCSI connection CID %hu on SID:"
4135 " %u\n", conn->cid, sess->sid);
4136 /*
4137 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4138 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4139 * sleeping and the logout response never got sent because the
4140 * connection failed.
4141 *
4142 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4143 * to signal logout response TX interrupt completion. Go ahead and skip
4144 * this for iser since isert_rx_opcode() does not wait on logout failure,
4145 * and to avoid iscsi_conn pointer dereference in iser-target code.
4146 */
4147 if (!conn->conn_transport->rdma_shutdown)
4148 complete(&conn->conn_logout_comp);
4149
4150 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4151 if (conn->tx_thread &&
4152 cmpxchg(&conn->tx_thread_active, true, false)) {
4153 send_sig(SIGINT, conn->tx_thread, 1);
4154 kthread_stop(conn->tx_thread);
4155 }
4156 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4157 if (conn->rx_thread &&
4158 cmpxchg(&conn->rx_thread_active, true, false)) {
4159 send_sig(SIGINT, conn->rx_thread, 1);
4160 kthread_stop(conn->rx_thread);
4161 }
4162 }
4163
4164 spin_lock(&iscsit_global->ts_bitmap_lock);
4165 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4166 get_order(1));
4167 spin_unlock(&iscsit_global->ts_bitmap_lock);
4168
4169 iscsit_stop_timers_for_cmds(conn);
4170 iscsit_stop_nopin_response_timer(conn);
4171 iscsit_stop_nopin_timer(conn);
4172
4173 if (conn->conn_transport->iscsit_wait_conn)
4174 conn->conn_transport->iscsit_wait_conn(conn);
4175
4176 /*
4177 * During Connection recovery drop unacknowledged out of order
4178 * commands for this connection, and prepare the other commands
4179 * for reallegiance.
4180 *
4181 * During normal operation clear the out of order commands (but
4182 * do not free the struct iscsi_ooo_cmdsn's) and release all
4183 * struct iscsi_cmds.
4184 */
4185 if (atomic_read(&conn->connection_recovery)) {
4186 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4187 iscsit_prepare_cmds_for_reallegiance(conn);
4188 } else {
4189 iscsit_clear_ooo_cmdsns_for_conn(conn);
4190 iscsit_release_commands_from_conn(conn);
4191 }
4192 iscsit_free_queue_reqs_for_conn(conn);
4193
4194 /*
4195 * Handle decrementing session or connection usage count if
4196 * a logout response was not able to be sent because the
4197 * connection failed. Fall back to Session Recovery here.
4198 */
4199 if (atomic_read(&conn->conn_logout_remove)) {
4200 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4201 iscsit_dec_conn_usage_count(conn);
4202 iscsit_dec_session_usage_count(sess);
4203 }
4204 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4205 iscsit_dec_conn_usage_count(conn);
4206
4207 atomic_set(&conn->conn_logout_remove, 0);
4208 atomic_set(&sess->session_reinstatement, 0);
4209 atomic_set(&sess->session_fall_back_to_erl0, 1);
4210 }
4211
4212 spin_lock_bh(&sess->conn_lock);
4213 list_del(&conn->conn_list);
4214
4215 /*
4216 * Attempt to let the Initiator know this connection failed by
4217 * sending an Connection Dropped Async Message on another
4218 * active connection.
4219 */
4220 if (atomic_read(&conn->connection_recovery))
4221 iscsit_build_conn_drop_async_message(conn);
4222
4223 spin_unlock_bh(&sess->conn_lock);
4224
4225 /*
4226 * If connection reinstatement is being performed on this connection,
4227 * up the connection reinstatement semaphore that is being blocked on
4228 * in iscsit_cause_connection_reinstatement().
4229 */
4230 spin_lock_bh(&conn->state_lock);
4231 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4232 spin_unlock_bh(&conn->state_lock);
4233 complete(&conn->conn_wait_comp);
4234 wait_for_completion(&conn->conn_post_wait_comp);
4235 spin_lock_bh(&conn->state_lock);
4236 }
4237
4238 /*
4239 * If connection reinstatement is being performed on this connection
4240 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4241 * connection wait rcfr semaphore that is being blocked on
4242 * an iscsit_connection_reinstatement_rcfr().
4243 */
4244 if (atomic_read(&conn->connection_wait_rcfr)) {
4245 spin_unlock_bh(&conn->state_lock);
4246 complete(&conn->conn_wait_rcfr_comp);
4247 wait_for_completion(&conn->conn_post_wait_comp);
4248 spin_lock_bh(&conn->state_lock);
4249 }
4250 atomic_set(&conn->connection_reinstatement, 1);
4251 spin_unlock_bh(&conn->state_lock);
4252
4253 /*
4254 * If any other processes are accessing this connection pointer we
4255 * must wait until they have completed.
4256 */
4257 iscsit_check_conn_usage_count(conn);
4258
4259 ahash_request_free(conn->conn_tx_hash);
4260 if (conn->conn_rx_hash) {
4261 struct crypto_ahash *tfm;
4262
4263 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4264 ahash_request_free(conn->conn_rx_hash);
4265 crypto_free_ahash(tfm);
4266 }
4267
4268 if (conn->sock)
4269 sock_release(conn->sock);
4270
4271 if (conn->conn_transport->iscsit_free_conn)
4272 conn->conn_transport->iscsit_free_conn(conn);
4273
4274 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4275 conn->conn_state = TARG_CONN_STATE_FREE;
4276 iscsit_free_conn(conn);
4277
4278 spin_lock_bh(&sess->conn_lock);
4279 atomic_dec(&sess->nconn);
4280 pr_debug("Decremented iSCSI connection count to %hu from node:"
4281 " %s\n", atomic_read(&sess->nconn),
4282 sess->sess_ops->InitiatorName);
4283 /*
4284 * Make sure that if one connection fails in an non ERL=2 iSCSI
4285 * Session that they all fail.
4286 */
4287 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4288 !atomic_read(&sess->session_logout))
4289 atomic_set(&sess->session_fall_back_to_erl0, 1);
4290
4291 /*
4292 * If this was not the last connection in the session, and we are
4293 * performing session reinstatement or falling back to ERL=0, call
4294 * iscsit_stop_session() without sleeping to shutdown the other
4295 * active connections.
4296 */
4297 if (atomic_read(&sess->nconn)) {
4298 if (!atomic_read(&sess->session_reinstatement) &&
4299 !atomic_read(&sess->session_fall_back_to_erl0)) {
4300 spin_unlock_bh(&sess->conn_lock);
4301 return 0;
4302 }
4303 if (!atomic_read(&sess->session_stop_active)) {
4304 atomic_set(&sess->session_stop_active, 1);
4305 spin_unlock_bh(&sess->conn_lock);
4306 iscsit_stop_session(sess, 0, 0);
4307 return 0;
4308 }
4309 spin_unlock_bh(&sess->conn_lock);
4310 return 0;
4311 }
4312
4313 /*
4314 * If this was the last connection in the session and one of the
4315 * following is occurring:
4316 *
4317 * Session Reinstatement is not being performed, and are falling back
4318 * to ERL=0 call iscsit_close_session().
4319 *
4320 * Session Logout was requested. iscsit_close_session() will be called
4321 * elsewhere.
4322 *
4323 * Session Continuation is not being performed, start the Time2Retain
4324 * handler and check if sleep_on_sess_wait_sem is active.
4325 */
4326 if (!atomic_read(&sess->session_reinstatement) &&
4327 atomic_read(&sess->session_fall_back_to_erl0)) {
4328 spin_unlock_bh(&sess->conn_lock);
4329 complete_all(&sess->session_wait_comp);
4330 iscsit_close_session(sess);
4331
4332 return 0;
4333 } else if (atomic_read(&sess->session_logout)) {
4334 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4335 sess->session_state = TARG_SESS_STATE_FREE;
4336
4337 if (atomic_read(&sess->session_close)) {
4338 spin_unlock_bh(&sess->conn_lock);
4339 complete_all(&sess->session_wait_comp);
4340 iscsit_close_session(sess);
4341 } else {
4342 spin_unlock_bh(&sess->conn_lock);
4343 }
4344
4345 return 0;
4346 } else {
4347 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4348 sess->session_state = TARG_SESS_STATE_FAILED;
4349
4350 if (!atomic_read(&sess->session_continuation))
4351 iscsit_start_time2retain_handler(sess);
4352
4353 if (atomic_read(&sess->session_close)) {
4354 spin_unlock_bh(&sess->conn_lock);
4355 complete_all(&sess->session_wait_comp);
4356 iscsit_close_session(sess);
4357 } else {
4358 spin_unlock_bh(&sess->conn_lock);
4359 }
4360
4361 return 0;
4362 }
4363 }
4364
4365 /*
4366 * If the iSCSI Session for the iSCSI Initiator Node exists,
4367 * forcefully shutdown the iSCSI NEXUS.
4368 */
iscsit_close_session(struct iscsi_session * sess)4369 int iscsit_close_session(struct iscsi_session *sess)
4370 {
4371 struct iscsi_portal_group *tpg = sess->tpg;
4372 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4373
4374 if (atomic_read(&sess->nconn)) {
4375 pr_err("%d connection(s) still exist for iSCSI session"
4376 " to %s\n", atomic_read(&sess->nconn),
4377 sess->sess_ops->InitiatorName);
4378 BUG();
4379 }
4380
4381 spin_lock_bh(&se_tpg->session_lock);
4382 atomic_set(&sess->session_logout, 1);
4383 atomic_set(&sess->session_reinstatement, 1);
4384 iscsit_stop_time2retain_timer(sess);
4385 spin_unlock_bh(&se_tpg->session_lock);
4386
4387 /*
4388 * transport_deregister_session_configfs() will clear the
4389 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4390 * can be setting it again with __transport_register_session() in
4391 * iscsi_post_login_handler() again after the iscsit_stop_session()
4392 * completes in iscsi_np context.
4393 */
4394 transport_deregister_session_configfs(sess->se_sess);
4395
4396 /*
4397 * If any other processes are accessing this session pointer we must
4398 * wait until they have completed. If we are in an interrupt (the
4399 * time2retain handler) and contain and active session usage count we
4400 * restart the timer and exit.
4401 */
4402 if (!in_interrupt()) {
4403 iscsit_check_session_usage_count(sess);
4404 } else {
4405 if (iscsit_check_session_usage_count(sess) == 2) {
4406 atomic_set(&sess->session_logout, 0);
4407 iscsit_start_time2retain_handler(sess);
4408 return 0;
4409 }
4410 }
4411
4412 transport_deregister_session(sess->se_sess);
4413
4414 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4415 iscsit_free_connection_recovery_entries(sess);
4416
4417 iscsit_free_all_ooo_cmdsns(sess);
4418
4419 spin_lock_bh(&se_tpg->session_lock);
4420 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4421 sess->session_state = TARG_SESS_STATE_FREE;
4422 pr_debug("Released iSCSI session from node: %s\n",
4423 sess->sess_ops->InitiatorName);
4424 tpg->nsessions--;
4425 if (tpg->tpg_tiqn)
4426 tpg->tpg_tiqn->tiqn_nsessions--;
4427
4428 pr_debug("Decremented number of active iSCSI Sessions on"
4429 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4430
4431 ida_free(&sess_ida, sess->session_index);
4432 kfree(sess->sess_ops);
4433 sess->sess_ops = NULL;
4434 spin_unlock_bh(&se_tpg->session_lock);
4435
4436 kfree(sess);
4437 return 0;
4438 }
4439
iscsit_logout_post_handler_closesession(struct iscsi_conn * conn)4440 static void iscsit_logout_post_handler_closesession(
4441 struct iscsi_conn *conn)
4442 {
4443 struct iscsi_session *sess = conn->sess;
4444 int sleep = 1;
4445 /*
4446 * Traditional iscsi/tcp will invoke this logic from TX thread
4447 * context during session logout, so clear tx_thread_active and
4448 * sleep if iscsit_close_connection() has not already occured.
4449 *
4450 * Since iser-target invokes this logic from it's own workqueue,
4451 * always sleep waiting for RX/TX thread shutdown to complete
4452 * within iscsit_close_connection().
4453 */
4454 if (!conn->conn_transport->rdma_shutdown) {
4455 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4456 if (!sleep)
4457 return;
4458 }
4459
4460 atomic_set(&conn->conn_logout_remove, 0);
4461 complete(&conn->conn_logout_comp);
4462
4463 iscsit_dec_conn_usage_count(conn);
4464 atomic_set(&sess->session_close, 1);
4465 iscsit_stop_session(sess, sleep, sleep);
4466 iscsit_dec_session_usage_count(sess);
4467 }
4468
iscsit_logout_post_handler_samecid(struct iscsi_conn * conn)4469 static void iscsit_logout_post_handler_samecid(
4470 struct iscsi_conn *conn)
4471 {
4472 int sleep = 1;
4473
4474 if (!conn->conn_transport->rdma_shutdown) {
4475 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4476 if (!sleep)
4477 return;
4478 }
4479
4480 atomic_set(&conn->conn_logout_remove, 0);
4481 complete(&conn->conn_logout_comp);
4482
4483 iscsit_cause_connection_reinstatement(conn, sleep);
4484 iscsit_dec_conn_usage_count(conn);
4485 }
4486
iscsit_logout_post_handler_diffcid(struct iscsi_conn * conn,u16 cid)4487 static void iscsit_logout_post_handler_diffcid(
4488 struct iscsi_conn *conn,
4489 u16 cid)
4490 {
4491 struct iscsi_conn *l_conn;
4492 struct iscsi_session *sess = conn->sess;
4493 bool conn_found = false;
4494
4495 if (!sess)
4496 return;
4497
4498 spin_lock_bh(&sess->conn_lock);
4499 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4500 if (l_conn->cid == cid) {
4501 iscsit_inc_conn_usage_count(l_conn);
4502 conn_found = true;
4503 break;
4504 }
4505 }
4506 spin_unlock_bh(&sess->conn_lock);
4507
4508 if (!conn_found)
4509 return;
4510
4511 if (l_conn->sock)
4512 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4513
4514 spin_lock_bh(&l_conn->state_lock);
4515 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4516 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4517 spin_unlock_bh(&l_conn->state_lock);
4518
4519 iscsit_cause_connection_reinstatement(l_conn, 1);
4520 iscsit_dec_conn_usage_count(l_conn);
4521 }
4522
4523 /*
4524 * Return of 0 causes the TX thread to restart.
4525 */
iscsit_logout_post_handler(struct iscsi_cmd * cmd,struct iscsi_conn * conn)4526 int iscsit_logout_post_handler(
4527 struct iscsi_cmd *cmd,
4528 struct iscsi_conn *conn)
4529 {
4530 int ret = 0;
4531
4532 switch (cmd->logout_reason) {
4533 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4534 switch (cmd->logout_response) {
4535 case ISCSI_LOGOUT_SUCCESS:
4536 case ISCSI_LOGOUT_CLEANUP_FAILED:
4537 default:
4538 iscsit_logout_post_handler_closesession(conn);
4539 break;
4540 }
4541 break;
4542 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4543 if (conn->cid == cmd->logout_cid) {
4544 switch (cmd->logout_response) {
4545 case ISCSI_LOGOUT_SUCCESS:
4546 case ISCSI_LOGOUT_CLEANUP_FAILED:
4547 default:
4548 iscsit_logout_post_handler_samecid(conn);
4549 break;
4550 }
4551 } else {
4552 switch (cmd->logout_response) {
4553 case ISCSI_LOGOUT_SUCCESS:
4554 iscsit_logout_post_handler_diffcid(conn,
4555 cmd->logout_cid);
4556 break;
4557 case ISCSI_LOGOUT_CID_NOT_FOUND:
4558 case ISCSI_LOGOUT_CLEANUP_FAILED:
4559 default:
4560 break;
4561 }
4562 ret = 1;
4563 }
4564 break;
4565 case ISCSI_LOGOUT_REASON_RECOVERY:
4566 switch (cmd->logout_response) {
4567 case ISCSI_LOGOUT_SUCCESS:
4568 case ISCSI_LOGOUT_CID_NOT_FOUND:
4569 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4570 case ISCSI_LOGOUT_CLEANUP_FAILED:
4571 default:
4572 break;
4573 }
4574 ret = 1;
4575 break;
4576 default:
4577 break;
4578
4579 }
4580 return ret;
4581 }
4582 EXPORT_SYMBOL(iscsit_logout_post_handler);
4583
iscsit_fail_session(struct iscsi_session * sess)4584 void iscsit_fail_session(struct iscsi_session *sess)
4585 {
4586 struct iscsi_conn *conn;
4587
4588 spin_lock_bh(&sess->conn_lock);
4589 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4590 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4591 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4592 }
4593 spin_unlock_bh(&sess->conn_lock);
4594
4595 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4596 sess->session_state = TARG_SESS_STATE_FAILED;
4597 }
4598
iscsit_stop_session(struct iscsi_session * sess,int session_sleep,int connection_sleep)4599 void iscsit_stop_session(
4600 struct iscsi_session *sess,
4601 int session_sleep,
4602 int connection_sleep)
4603 {
4604 u16 conn_count = atomic_read(&sess->nconn);
4605 struct iscsi_conn *conn, *conn_tmp = NULL;
4606 int is_last;
4607
4608 spin_lock_bh(&sess->conn_lock);
4609
4610 if (connection_sleep) {
4611 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4612 conn_list) {
4613 if (conn_count == 0)
4614 break;
4615
4616 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4617 is_last = 1;
4618 } else {
4619 iscsit_inc_conn_usage_count(conn_tmp);
4620 is_last = 0;
4621 }
4622 iscsit_inc_conn_usage_count(conn);
4623
4624 spin_unlock_bh(&sess->conn_lock);
4625 iscsit_cause_connection_reinstatement(conn, 1);
4626 spin_lock_bh(&sess->conn_lock);
4627
4628 iscsit_dec_conn_usage_count(conn);
4629 if (is_last == 0)
4630 iscsit_dec_conn_usage_count(conn_tmp);
4631 conn_count--;
4632 }
4633 } else {
4634 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4635 iscsit_cause_connection_reinstatement(conn, 0);
4636 }
4637
4638 if (session_sleep && atomic_read(&sess->nconn)) {
4639 spin_unlock_bh(&sess->conn_lock);
4640 wait_for_completion(&sess->session_wait_comp);
4641 } else
4642 spin_unlock_bh(&sess->conn_lock);
4643 }
4644
iscsit_release_sessions_for_tpg(struct iscsi_portal_group * tpg,int force)4645 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4646 {
4647 struct iscsi_session *sess;
4648 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4649 struct se_session *se_sess, *se_sess_tmp;
4650 LIST_HEAD(free_list);
4651 int session_count = 0;
4652
4653 spin_lock_bh(&se_tpg->session_lock);
4654 if (tpg->nsessions && !force) {
4655 spin_unlock_bh(&se_tpg->session_lock);
4656 return -1;
4657 }
4658
4659 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4660 sess_list) {
4661 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4662
4663 spin_lock(&sess->conn_lock);
4664 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4665 atomic_read(&sess->session_logout) ||
4666 atomic_read(&sess->session_close) ||
4667 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4668 spin_unlock(&sess->conn_lock);
4669 continue;
4670 }
4671 iscsit_inc_session_usage_count(sess);
4672 atomic_set(&sess->session_reinstatement, 1);
4673 atomic_set(&sess->session_fall_back_to_erl0, 1);
4674 atomic_set(&sess->session_close, 1);
4675 spin_unlock(&sess->conn_lock);
4676
4677 list_move_tail(&se_sess->sess_list, &free_list);
4678 }
4679 spin_unlock_bh(&se_tpg->session_lock);
4680
4681 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4682 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4683
4684 list_del_init(&se_sess->sess_list);
4685 iscsit_stop_session(sess, 1, 1);
4686 iscsit_dec_session_usage_count(sess);
4687 session_count++;
4688 }
4689
4690 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4691 " Group: %hu\n", session_count, tpg->tpgt);
4692 return 0;
4693 }
4694
4695 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4696 MODULE_VERSION("4.1.x");
4697 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4698 MODULE_LICENSE("GPL");
4699
4700 module_init(iscsi_target_init_module);
4701 module_exit(iscsi_target_cleanup_module);
4702
