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 __target_init_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->se_cmd.tag = (__force u32)cmd->init_task_tag;
1170 cmd->sense_reason = target_cmd_init_cdb(&cmd->se_cmd, hdr->cdb,
1171 GFP_KERNEL);
1172
1173 if (cmd->sense_reason) {
1174 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1175 return iscsit_add_reject_cmd(cmd,
1176 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1177 }
1178
1179 goto attach_cmd;
1180 }
1181
1182 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd);
1183 if (cmd->sense_reason)
1184 goto attach_cmd;
1185
1186 cmd->sense_reason = target_cmd_parse_cdb(&cmd->se_cmd);
1187 if (cmd->sense_reason)
1188 goto attach_cmd;
1189
1190 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1191 return iscsit_add_reject_cmd(cmd,
1192 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1193 }
1194
1195 attach_cmd:
1196 spin_lock_bh(&conn->cmd_lock);
1197 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1198 spin_unlock_bh(&conn->cmd_lock);
1199 /*
1200 * Check if we need to delay processing because of ALUA
1201 * Active/NonOptimized primary access state..
1202 */
1203 core_alua_check_nonop_delay(&cmd->se_cmd);
1204
1205 return 0;
1206 }
1207 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1208
iscsit_set_unsolicited_dataout(struct iscsi_cmd * cmd)1209 void iscsit_set_unsolicited_dataout(struct iscsi_cmd *cmd)
1210 {
1211 iscsit_set_dataout_sequence_values(cmd);
1212
1213 spin_lock_bh(&cmd->dataout_timeout_lock);
1214 iscsit_start_dataout_timer(cmd, cmd->conn);
1215 spin_unlock_bh(&cmd->dataout_timeout_lock);
1216 }
1217 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout);
1218
iscsit_process_scsi_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_scsi_req * hdr)1219 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1220 struct iscsi_scsi_req *hdr)
1221 {
1222 int cmdsn_ret = 0;
1223 /*
1224 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1225 * the Immediate Bit is not set, and no Immediate
1226 * Data is attached.
1227 *
1228 * A PDU/CmdSN carrying Immediate Data can only
1229 * be processed after the DataCRC has passed.
1230 * If the DataCRC fails, the CmdSN MUST NOT
1231 * be acknowledged. (See below)
1232 */
1233 if (!cmd->immediate_data) {
1234 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1235 (unsigned char *)hdr, hdr->cmdsn);
1236 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1237 return -1;
1238 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1239 target_put_sess_cmd(&cmd->se_cmd);
1240 return 0;
1241 }
1242 }
1243
1244 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1245
1246 /*
1247 * If no Immediate Data is attached, it's OK to return now.
1248 */
1249 if (!cmd->immediate_data) {
1250 if (!cmd->sense_reason && cmd->unsolicited_data)
1251 iscsit_set_unsolicited_dataout(cmd);
1252 if (!cmd->sense_reason)
1253 return 0;
1254
1255 target_put_sess_cmd(&cmd->se_cmd);
1256 return 0;
1257 }
1258
1259 /*
1260 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1261 * execution. These exceptions are processed in CmdSN order using
1262 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1263 */
1264 if (cmd->sense_reason)
1265 return 1;
1266 /*
1267 * Call directly into transport_generic_new_cmd() to perform
1268 * the backend memory allocation.
1269 */
1270 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1271 if (cmd->sense_reason)
1272 return 1;
1273
1274 return 0;
1275 }
1276 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1277
1278 static int
iscsit_get_immediate_data(struct iscsi_cmd * cmd,struct iscsi_scsi_req * hdr,bool dump_payload)1279 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1280 bool dump_payload)
1281 {
1282 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1283 int rc;
1284
1285 /*
1286 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1287 */
1288 if (dump_payload) {
1289 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done,
1290 cmd->first_burst_len);
1291
1292 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n",
1293 cmd->se_cmd.data_length, cmd->write_data_done,
1294 cmd->first_burst_len, length);
1295 rc = iscsit_dump_data_payload(cmd->conn, length, 1);
1296 pr_debug("Finished dumping immediate data\n");
1297 if (rc < 0)
1298 immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER;
1299 } else {
1300 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1301 cmd->first_burst_len);
1302 }
1303
1304 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1305 /*
1306 * A PDU/CmdSN carrying Immediate Data passed
1307 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1308 * Immediate Bit is not set.
1309 */
1310 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1311 (unsigned char *)hdr, hdr->cmdsn);
1312 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1313 return -1;
1314
1315 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1316 target_put_sess_cmd(&cmd->se_cmd);
1317
1318 return 0;
1319 } else if (cmd->unsolicited_data)
1320 iscsit_set_unsolicited_dataout(cmd);
1321
1322 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1323 /*
1324 * Immediate Data failed DataCRC and ERL>=1,
1325 * silently drop this PDU and let the initiator
1326 * plug the CmdSN gap.
1327 *
1328 * FIXME: Send Unsolicited NOPIN with reserved
1329 * TTT here to help the initiator figure out
1330 * the missing CmdSN, although they should be
1331 * intelligent enough to determine the missing
1332 * CmdSN and issue a retry to plug the sequence.
1333 */
1334 cmd->i_state = ISTATE_REMOVE;
1335 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1336 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1337 return -1;
1338
1339 return 0;
1340 }
1341
1342 static int
iscsit_handle_scsi_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)1343 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1344 unsigned char *buf)
1345 {
1346 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1347 int rc, immed_data;
1348 bool dump_payload = false;
1349
1350 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1351 if (rc < 0)
1352 return 0;
1353 /*
1354 * Allocation iovecs needed for struct socket operations for
1355 * traditional iSCSI block I/O.
1356 */
1357 if (iscsit_allocate_iovecs(cmd) < 0) {
1358 return iscsit_reject_cmd(cmd,
1359 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1360 }
1361 immed_data = cmd->immediate_data;
1362
1363 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1364 if (rc < 0)
1365 return rc;
1366 else if (rc > 0)
1367 dump_payload = true;
1368
1369 if (!immed_data)
1370 return 0;
1371
1372 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1373 }
1374
iscsit_do_crypto_hash_sg(struct ahash_request * hash,struct iscsi_cmd * cmd,u32 data_offset,u32 data_length,u32 padding,u8 * pad_bytes)1375 static u32 iscsit_do_crypto_hash_sg(
1376 struct ahash_request *hash,
1377 struct iscsi_cmd *cmd,
1378 u32 data_offset,
1379 u32 data_length,
1380 u32 padding,
1381 u8 *pad_bytes)
1382 {
1383 u32 data_crc;
1384 struct scatterlist *sg;
1385 unsigned int page_off;
1386
1387 crypto_ahash_init(hash);
1388
1389 sg = cmd->first_data_sg;
1390 page_off = cmd->first_data_sg_off;
1391
1392 if (data_length && page_off) {
1393 struct scatterlist first_sg;
1394 u32 len = min_t(u32, data_length, sg->length - page_off);
1395
1396 sg_init_table(&first_sg, 1);
1397 sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off);
1398
1399 ahash_request_set_crypt(hash, &first_sg, NULL, len);
1400 crypto_ahash_update(hash);
1401
1402 data_length -= len;
1403 sg = sg_next(sg);
1404 }
1405
1406 while (data_length) {
1407 u32 cur_len = min_t(u32, data_length, sg->length);
1408
1409 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1410 crypto_ahash_update(hash);
1411
1412 data_length -= cur_len;
1413 /* iscsit_map_iovec has already checked for invalid sg pointers */
1414 sg = sg_next(sg);
1415 }
1416
1417 if (padding) {
1418 struct scatterlist pad_sg;
1419
1420 sg_init_one(&pad_sg, pad_bytes, padding);
1421 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1422 padding);
1423 crypto_ahash_finup(hash);
1424 } else {
1425 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1426 crypto_ahash_final(hash);
1427 }
1428
1429 return data_crc;
1430 }
1431
iscsit_do_crypto_hash_buf(struct ahash_request * hash,const void * buf,u32 payload_length,u32 padding,const void * pad_bytes,void * data_crc)1432 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1433 const void *buf, u32 payload_length, u32 padding,
1434 const void *pad_bytes, void *data_crc)
1435 {
1436 struct scatterlist sg[2];
1437
1438 sg_init_table(sg, ARRAY_SIZE(sg));
1439 sg_set_buf(sg, buf, payload_length);
1440 if (padding)
1441 sg_set_buf(sg + 1, pad_bytes, padding);
1442
1443 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1444
1445 crypto_ahash_digest(hash);
1446 }
1447
1448 int
__iscsit_check_dataout_hdr(struct iscsi_conn * conn,void * buf,struct iscsi_cmd * cmd,u32 payload_length,bool * success)1449 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1450 struct iscsi_cmd *cmd, u32 payload_length,
1451 bool *success)
1452 {
1453 struct iscsi_data *hdr = buf;
1454 struct se_cmd *se_cmd;
1455 int rc;
1456
1457 /* iSCSI write */
1458 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1459
1460 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1461 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1462 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1463 payload_length, conn->cid);
1464
1465 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1466 pr_err("Command ITT: 0x%08x received DataOUT after"
1467 " last DataOUT received, dumping payload\n",
1468 cmd->init_task_tag);
1469 return iscsit_dump_data_payload(conn, payload_length, 1);
1470 }
1471
1472 if (cmd->data_direction != DMA_TO_DEVICE) {
1473 pr_err("Command ITT: 0x%08x received DataOUT for a"
1474 " NON-WRITE command.\n", cmd->init_task_tag);
1475 return iscsit_dump_data_payload(conn, payload_length, 1);
1476 }
1477 se_cmd = &cmd->se_cmd;
1478 iscsit_mod_dataout_timer(cmd);
1479
1480 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1481 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1482 be32_to_cpu(hdr->offset), payload_length,
1483 cmd->se_cmd.data_length);
1484 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1485 }
1486
1487 if (cmd->unsolicited_data) {
1488 int dump_unsolicited_data = 0;
1489
1490 if (conn->sess->sess_ops->InitialR2T) {
1491 pr_err("Received unexpected unsolicited data"
1492 " while InitialR2T=Yes, protocol error.\n");
1493 transport_send_check_condition_and_sense(&cmd->se_cmd,
1494 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1495 return -1;
1496 }
1497 /*
1498 * Special case for dealing with Unsolicited DataOUT
1499 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1500 * failures;
1501 */
1502
1503 /* Something's amiss if we're not in WRITE_PENDING state... */
1504 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1505 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1506 dump_unsolicited_data = 1;
1507
1508 if (dump_unsolicited_data) {
1509 /*
1510 * Check if a delayed TASK_ABORTED status needs to
1511 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1512 * received with the unsolicited data out.
1513 */
1514 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1515 iscsit_stop_dataout_timer(cmd);
1516
1517 return iscsit_dump_data_payload(conn, payload_length, 1);
1518 }
1519 } else {
1520 /*
1521 * For the normal solicited data path:
1522 *
1523 * Check for a delayed TASK_ABORTED status and dump any
1524 * incoming data out payload if one exists. Also, when the
1525 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1526 * data out sequence, we decrement outstanding_r2ts. Once
1527 * outstanding_r2ts reaches zero, go ahead and send the delayed
1528 * TASK_ABORTED status.
1529 */
1530 if (se_cmd->transport_state & CMD_T_ABORTED) {
1531 if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1532 --cmd->outstanding_r2ts < 1)
1533 iscsit_stop_dataout_timer(cmd);
1534
1535 return iscsit_dump_data_payload(conn, payload_length, 1);
1536 }
1537 }
1538 /*
1539 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1540 * within-command recovery checks before receiving the payload.
1541 */
1542 rc = iscsit_check_pre_dataout(cmd, buf);
1543 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1544 return 0;
1545 else if (rc == DATAOUT_CANNOT_RECOVER)
1546 return -1;
1547 *success = true;
1548 return 0;
1549 }
1550 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1551
1552 int
iscsit_check_dataout_hdr(struct iscsi_conn * conn,void * buf,struct iscsi_cmd ** out_cmd)1553 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1554 struct iscsi_cmd **out_cmd)
1555 {
1556 struct iscsi_data *hdr = buf;
1557 struct iscsi_cmd *cmd;
1558 u32 payload_length = ntoh24(hdr->dlength);
1559 int rc;
1560 bool success = false;
1561
1562 if (!payload_length) {
1563 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1564 return 0;
1565 }
1566
1567 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1568 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1569 " MaxXmitDataSegmentLength: %u\n", payload_length,
1570 conn->conn_ops->MaxXmitDataSegmentLength);
1571 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1572 }
1573
1574 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1575 if (!cmd)
1576 return 0;
1577
1578 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1579
1580 if (success)
1581 *out_cmd = cmd;
1582
1583 return rc;
1584 }
1585 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1586
1587 static int
iscsit_get_dataout(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_data * hdr)1588 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1589 struct iscsi_data *hdr)
1590 {
1591 struct kvec *iov;
1592 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1593 u32 payload_length;
1594 int iov_ret, data_crc_failed = 0;
1595
1596 payload_length = min_t(u32, cmd->se_cmd.data_length,
1597 ntoh24(hdr->dlength));
1598 rx_size += payload_length;
1599 iov = &cmd->iov_data[0];
1600
1601 iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2,
1602 be32_to_cpu(hdr->offset), payload_length);
1603 if (iov_ret < 0)
1604 return -1;
1605
1606 iov_count += iov_ret;
1607
1608 padding = ((-payload_length) & 3);
1609 if (padding != 0) {
1610 iov[iov_count].iov_base = cmd->pad_bytes;
1611 iov[iov_count++].iov_len = padding;
1612 rx_size += padding;
1613 pr_debug("Receiving %u padding bytes.\n", padding);
1614 }
1615
1616 if (conn->conn_ops->DataDigest) {
1617 iov[iov_count].iov_base = &checksum;
1618 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1619 rx_size += ISCSI_CRC_LEN;
1620 }
1621
1622 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
1623 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1624
1625 iscsit_unmap_iovec(cmd);
1626
1627 if (rx_got != rx_size)
1628 return -1;
1629
1630 if (conn->conn_ops->DataDigest) {
1631 u32 data_crc;
1632
1633 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1634 be32_to_cpu(hdr->offset),
1635 payload_length, padding,
1636 cmd->pad_bytes);
1637
1638 if (checksum != data_crc) {
1639 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1640 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1641 " does not match computed 0x%08x\n",
1642 hdr->itt, hdr->offset, payload_length,
1643 hdr->datasn, checksum, data_crc);
1644 data_crc_failed = 1;
1645 } else {
1646 pr_debug("Got CRC32C DataDigest 0x%08x for"
1647 " %u bytes of Data Out\n", checksum,
1648 payload_length);
1649 }
1650 }
1651
1652 return data_crc_failed;
1653 }
1654
1655 int
iscsit_check_dataout_payload(struct iscsi_cmd * cmd,struct iscsi_data * hdr,bool data_crc_failed)1656 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1657 bool data_crc_failed)
1658 {
1659 struct iscsi_conn *conn = cmd->conn;
1660 int rc, ooo_cmdsn;
1661 /*
1662 * Increment post receive data and CRC values or perform
1663 * within-command recovery.
1664 */
1665 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1666 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1667 return 0;
1668 else if (rc == DATAOUT_SEND_R2T) {
1669 iscsit_set_dataout_sequence_values(cmd);
1670 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1671 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1672 /*
1673 * Handle extra special case for out of order
1674 * Unsolicited Data Out.
1675 */
1676 spin_lock_bh(&cmd->istate_lock);
1677 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1678 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1679 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1680 spin_unlock_bh(&cmd->istate_lock);
1681
1682 iscsit_stop_dataout_timer(cmd);
1683 if (ooo_cmdsn)
1684 return 0;
1685 target_execute_cmd(&cmd->se_cmd);
1686 return 0;
1687 } else /* DATAOUT_CANNOT_RECOVER */
1688 return -1;
1689
1690 return 0;
1691 }
1692 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1693
iscsit_handle_data_out(struct iscsi_conn * conn,unsigned char * buf)1694 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1695 {
1696 struct iscsi_cmd *cmd = NULL;
1697 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1698 int rc;
1699 bool data_crc_failed = false;
1700
1701 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1702 if (rc < 0)
1703 return 0;
1704 else if (!cmd)
1705 return 0;
1706
1707 rc = iscsit_get_dataout(conn, cmd, hdr);
1708 if (rc < 0)
1709 return rc;
1710 else if (rc > 0)
1711 data_crc_failed = true;
1712
1713 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1714 }
1715
iscsit_setup_nop_out(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_nopout * hdr)1716 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1717 struct iscsi_nopout *hdr)
1718 {
1719 u32 payload_length = ntoh24(hdr->dlength);
1720
1721 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1722 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1723 if (!cmd)
1724 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1725 (unsigned char *)hdr);
1726
1727 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1728 (unsigned char *)hdr);
1729 }
1730
1731 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1732 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1733 " not set, protocol error.\n");
1734 if (!cmd)
1735 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1736 (unsigned char *)hdr);
1737
1738 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1739 (unsigned char *)hdr);
1740 }
1741
1742 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1743 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1744 " greater than MaxXmitDataSegmentLength: %u, protocol"
1745 " error.\n", payload_length,
1746 conn->conn_ops->MaxXmitDataSegmentLength);
1747 if (!cmd)
1748 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1749 (unsigned char *)hdr);
1750
1751 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1752 (unsigned char *)hdr);
1753 }
1754
1755 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1756 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1757 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1758 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1759 payload_length);
1760 /*
1761 * This is not a response to a Unsolicited NopIN, which means
1762 * it can either be a NOPOUT ping request (with a valid ITT),
1763 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1764 * Either way, make sure we allocate an struct iscsi_cmd, as both
1765 * can contain ping data.
1766 */
1767 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1768 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1769 cmd->i_state = ISTATE_SEND_NOPIN;
1770 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1771 1 : 0);
1772 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1773 cmd->targ_xfer_tag = 0xFFFFFFFF;
1774 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1775 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1776 cmd->data_direction = DMA_NONE;
1777 }
1778
1779 return 0;
1780 }
1781 EXPORT_SYMBOL(iscsit_setup_nop_out);
1782
iscsit_process_nop_out(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_nopout * hdr)1783 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1784 struct iscsi_nopout *hdr)
1785 {
1786 struct iscsi_cmd *cmd_p = NULL;
1787 int cmdsn_ret = 0;
1788 /*
1789 * Initiator is expecting a NopIN ping reply..
1790 */
1791 if (hdr->itt != RESERVED_ITT) {
1792 if (!cmd)
1793 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1794 (unsigned char *)hdr);
1795
1796 spin_lock_bh(&conn->cmd_lock);
1797 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1798 spin_unlock_bh(&conn->cmd_lock);
1799
1800 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1801
1802 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1803 iscsit_add_cmd_to_response_queue(cmd, conn,
1804 cmd->i_state);
1805 return 0;
1806 }
1807
1808 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1809 (unsigned char *)hdr, hdr->cmdsn);
1810 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1811 return 0;
1812 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1813 return -1;
1814
1815 return 0;
1816 }
1817 /*
1818 * This was a response to a unsolicited NOPIN ping.
1819 */
1820 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1821 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1822 if (!cmd_p)
1823 return -EINVAL;
1824
1825 iscsit_stop_nopin_response_timer(conn);
1826
1827 cmd_p->i_state = ISTATE_REMOVE;
1828 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1829
1830 iscsit_start_nopin_timer(conn);
1831 return 0;
1832 }
1833 /*
1834 * Otherwise, initiator is not expecting a NOPIN is response.
1835 * Just ignore for now.
1836 */
1837
1838 if (cmd)
1839 iscsit_free_cmd(cmd, false);
1840
1841 return 0;
1842 }
1843 EXPORT_SYMBOL(iscsit_process_nop_out);
1844
iscsit_handle_nop_out(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)1845 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1846 unsigned char *buf)
1847 {
1848 unsigned char *ping_data = NULL;
1849 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1850 struct kvec *iov = NULL;
1851 u32 payload_length = ntoh24(hdr->dlength);
1852 int ret;
1853
1854 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1855 if (ret < 0)
1856 return 0;
1857 /*
1858 * Handle NOP-OUT payload for traditional iSCSI sockets
1859 */
1860 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1861 u32 checksum, data_crc, padding = 0;
1862 int niov = 0, rx_got, rx_size = payload_length;
1863
1864 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1865 if (!ping_data) {
1866 ret = -1;
1867 goto out;
1868 }
1869
1870 iov = &cmd->iov_misc[0];
1871 iov[niov].iov_base = ping_data;
1872 iov[niov++].iov_len = payload_length;
1873
1874 padding = ((-payload_length) & 3);
1875 if (padding != 0) {
1876 pr_debug("Receiving %u additional bytes"
1877 " for padding.\n", padding);
1878 iov[niov].iov_base = &cmd->pad_bytes;
1879 iov[niov++].iov_len = padding;
1880 rx_size += padding;
1881 }
1882 if (conn->conn_ops->DataDigest) {
1883 iov[niov].iov_base = &checksum;
1884 iov[niov++].iov_len = ISCSI_CRC_LEN;
1885 rx_size += ISCSI_CRC_LEN;
1886 }
1887
1888 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc));
1889 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1890 if (rx_got != rx_size) {
1891 ret = -1;
1892 goto out;
1893 }
1894
1895 if (conn->conn_ops->DataDigest) {
1896 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1897 payload_length, padding,
1898 cmd->pad_bytes, &data_crc);
1899
1900 if (checksum != data_crc) {
1901 pr_err("Ping data CRC32C DataDigest"
1902 " 0x%08x does not match computed 0x%08x\n",
1903 checksum, data_crc);
1904 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1905 pr_err("Unable to recover from"
1906 " NOPOUT Ping DataCRC failure while in"
1907 " ERL=0.\n");
1908 ret = -1;
1909 goto out;
1910 } else {
1911 /*
1912 * Silently drop this PDU and let the
1913 * initiator plug the CmdSN gap.
1914 */
1915 pr_debug("Dropping NOPOUT"
1916 " Command CmdSN: 0x%08x due to"
1917 " DataCRC error.\n", hdr->cmdsn);
1918 ret = 0;
1919 goto out;
1920 }
1921 } else {
1922 pr_debug("Got CRC32C DataDigest"
1923 " 0x%08x for %u bytes of ping data.\n",
1924 checksum, payload_length);
1925 }
1926 }
1927
1928 ping_data[payload_length] = '\0';
1929 /*
1930 * Attach ping data to struct iscsi_cmd->buf_ptr.
1931 */
1932 cmd->buf_ptr = ping_data;
1933 cmd->buf_ptr_size = payload_length;
1934
1935 pr_debug("Got %u bytes of NOPOUT ping"
1936 " data.\n", payload_length);
1937 pr_debug("Ping Data: \"%s\"\n", ping_data);
1938 }
1939
1940 return iscsit_process_nop_out(conn, cmd, hdr);
1941 out:
1942 if (cmd)
1943 iscsit_free_cmd(cmd, false);
1944
1945 kfree(ping_data);
1946 return ret;
1947 }
1948
iscsit_convert_tmf(u8 iscsi_tmf)1949 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1950 {
1951 switch (iscsi_tmf) {
1952 case ISCSI_TM_FUNC_ABORT_TASK:
1953 return TMR_ABORT_TASK;
1954 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1955 return TMR_ABORT_TASK_SET;
1956 case ISCSI_TM_FUNC_CLEAR_ACA:
1957 return TMR_CLEAR_ACA;
1958 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1959 return TMR_CLEAR_TASK_SET;
1960 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1961 return TMR_LUN_RESET;
1962 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1963 return TMR_TARGET_WARM_RESET;
1964 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1965 return TMR_TARGET_COLD_RESET;
1966 default:
1967 return TMR_UNKNOWN;
1968 }
1969 }
1970
1971 int
iscsit_handle_task_mgt_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)1972 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1973 unsigned char *buf)
1974 {
1975 struct se_tmr_req *se_tmr;
1976 struct iscsi_tmr_req *tmr_req;
1977 struct iscsi_tm *hdr;
1978 int out_of_order_cmdsn = 0, ret;
1979 u8 function, tcm_function = TMR_UNKNOWN;
1980
1981 hdr = (struct iscsi_tm *) buf;
1982 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1983 function = hdr->flags;
1984
1985 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1986 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1987 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1988 hdr->rtt, hdr->refcmdsn, conn->cid);
1989
1990 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1991 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1992 hdr->rtt != RESERVED_ITT)) {
1993 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1994 hdr->rtt = RESERVED_ITT;
1995 }
1996
1997 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1998 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1999 pr_err("Task Management Request TASK_REASSIGN not"
2000 " issued as immediate command, bad iSCSI Initiator"
2001 "implementation\n");
2002 return iscsit_add_reject_cmd(cmd,
2003 ISCSI_REASON_PROTOCOL_ERROR, buf);
2004 }
2005 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2006 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
2007 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
2008
2009 cmd->data_direction = DMA_NONE;
2010 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
2011 if (!cmd->tmr_req) {
2012 return iscsit_add_reject_cmd(cmd,
2013 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2014 buf);
2015 }
2016
2017 __target_init_cmd(&cmd->se_cmd, &iscsi_ops,
2018 conn->sess->se_sess, 0, DMA_NONE,
2019 TCM_SIMPLE_TAG, cmd->sense_buffer + 2,
2020 scsilun_to_int(&hdr->lun));
2021
2022 target_get_sess_cmd(&cmd->se_cmd, true);
2023
2024 /*
2025 * TASK_REASSIGN for ERL=2 / connection stays inside of
2026 * LIO-Target $FABRIC_MOD
2027 */
2028 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2029 tcm_function = iscsit_convert_tmf(function);
2030 if (tcm_function == TMR_UNKNOWN) {
2031 pr_err("Unknown iSCSI TMR Function:"
2032 " 0x%02x\n", function);
2033 return iscsit_add_reject_cmd(cmd,
2034 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2035 }
2036 }
2037 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2038 GFP_KERNEL);
2039 if (ret < 0)
2040 return iscsit_add_reject_cmd(cmd,
2041 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2042
2043 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2044
2045 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2046 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2047 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2048 cmd->init_task_tag = hdr->itt;
2049 cmd->targ_xfer_tag = 0xFFFFFFFF;
2050 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2051 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2052 se_tmr = cmd->se_cmd.se_tmr_req;
2053 tmr_req = cmd->tmr_req;
2054 /*
2055 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2056 */
2057 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2058 ret = transport_lookup_tmr_lun(&cmd->se_cmd);
2059 if (ret < 0) {
2060 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2061 goto attach;
2062 }
2063 }
2064
2065 switch (function) {
2066 case ISCSI_TM_FUNC_ABORT_TASK:
2067 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2068 if (se_tmr->response)
2069 goto attach;
2070 break;
2071 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2072 case ISCSI_TM_FUNC_CLEAR_ACA:
2073 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2074 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2075 break;
2076 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2077 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2078 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2079 goto attach;
2080 }
2081 break;
2082 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2083 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2084 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2085 goto attach;
2086 }
2087 break;
2088 case ISCSI_TM_FUNC_TASK_REASSIGN:
2089 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2090 /*
2091 * Perform sanity checks on the ExpDataSN only if the
2092 * TASK_REASSIGN was successful.
2093 */
2094 if (se_tmr->response)
2095 break;
2096
2097 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2098 return iscsit_add_reject_cmd(cmd,
2099 ISCSI_REASON_BOOKMARK_INVALID, buf);
2100 break;
2101 default:
2102 pr_err("Unknown TMR function: 0x%02x, protocol"
2103 " error.\n", function);
2104 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2105 goto attach;
2106 }
2107
2108 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2109 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2110 se_tmr->call_transport = 1;
2111 attach:
2112 spin_lock_bh(&conn->cmd_lock);
2113 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2114 spin_unlock_bh(&conn->cmd_lock);
2115
2116 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2117 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2118 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2119 out_of_order_cmdsn = 1;
2120 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2121 target_put_sess_cmd(&cmd->se_cmd);
2122 return 0;
2123 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2124 return -1;
2125 }
2126 }
2127 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2128
2129 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2130 return 0;
2131 /*
2132 * Found the referenced task, send to transport for processing.
2133 */
2134 if (se_tmr->call_transport)
2135 return transport_generic_handle_tmr(&cmd->se_cmd);
2136
2137 /*
2138 * Could not find the referenced LUN, task, or Task Management
2139 * command not authorized or supported. Change state and
2140 * let the tx_thread send the response.
2141 *
2142 * For connection recovery, this is also the default action for
2143 * TMR TASK_REASSIGN.
2144 */
2145 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2146 target_put_sess_cmd(&cmd->se_cmd);
2147 return 0;
2148 }
2149 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2150
2151 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2152 int
iscsit_setup_text_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_text * hdr)2153 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2154 struct iscsi_text *hdr)
2155 {
2156 u32 payload_length = ntoh24(hdr->dlength);
2157
2158 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2159 pr_err("Unable to accept text parameter length: %u"
2160 "greater than MaxXmitDataSegmentLength %u.\n",
2161 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2162 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2163 (unsigned char *)hdr);
2164 }
2165
2166 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2167 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2168 pr_err("Multi sequence text commands currently not supported\n");
2169 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2170 (unsigned char *)hdr);
2171 }
2172
2173 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2174 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2175 hdr->exp_statsn, payload_length);
2176
2177 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2178 cmd->i_state = ISTATE_SEND_TEXTRSP;
2179 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2180 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2181 cmd->targ_xfer_tag = 0xFFFFFFFF;
2182 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2183 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2184 cmd->data_direction = DMA_NONE;
2185 kfree(cmd->text_in_ptr);
2186 cmd->text_in_ptr = NULL;
2187
2188 return 0;
2189 }
2190 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2191
2192 int
iscsit_process_text_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,struct iscsi_text * hdr)2193 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2194 struct iscsi_text *hdr)
2195 {
2196 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2197 int cmdsn_ret;
2198
2199 if (!text_in) {
2200 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2201 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2202 pr_err("Unable to locate text_in buffer for sendtargets"
2203 " discovery\n");
2204 goto reject;
2205 }
2206 goto empty_sendtargets;
2207 }
2208 if (strncmp("SendTargets=", text_in, 12) != 0) {
2209 pr_err("Received Text Data that is not"
2210 " SendTargets, cannot continue.\n");
2211 goto reject;
2212 }
2213 /* '=' confirmed in strncmp */
2214 text_ptr = strchr(text_in, '=');
2215 BUG_ON(!text_ptr);
2216 if (!strncmp("=All", text_ptr, 5)) {
2217 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2218 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2219 !strncmp("=eui.", text_ptr, 5)) {
2220 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2221 } else {
2222 pr_err("Unable to locate valid SendTargets%s value\n",
2223 text_ptr);
2224 goto reject;
2225 }
2226
2227 spin_lock_bh(&conn->cmd_lock);
2228 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2229 spin_unlock_bh(&conn->cmd_lock);
2230
2231 empty_sendtargets:
2232 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2233
2234 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2235 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2236 (unsigned char *)hdr, hdr->cmdsn);
2237 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2238 return -1;
2239
2240 return 0;
2241 }
2242
2243 return iscsit_execute_cmd(cmd, 0);
2244
2245 reject:
2246 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2247 (unsigned char *)hdr);
2248 }
2249 EXPORT_SYMBOL(iscsit_process_text_cmd);
2250
2251 static int
iscsit_handle_text_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)2252 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2253 unsigned char *buf)
2254 {
2255 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2256 char *text_in = NULL;
2257 u32 payload_length = ntoh24(hdr->dlength);
2258 int rx_size, rc;
2259
2260 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2261 if (rc < 0)
2262 return 0;
2263
2264 rx_size = payload_length;
2265 if (payload_length) {
2266 u32 checksum = 0, data_crc = 0;
2267 u32 padding = 0;
2268 int niov = 0, rx_got;
2269 struct kvec iov[2];
2270
2271 rx_size = ALIGN(payload_length, 4);
2272 text_in = kzalloc(rx_size, GFP_KERNEL);
2273 if (!text_in)
2274 goto reject;
2275
2276 cmd->text_in_ptr = text_in;
2277
2278 memset(iov, 0, sizeof(iov));
2279 iov[niov].iov_base = text_in;
2280 iov[niov++].iov_len = rx_size;
2281
2282 padding = rx_size - payload_length;
2283 if (padding)
2284 pr_debug("Receiving %u additional bytes"
2285 " for padding.\n", padding);
2286 if (conn->conn_ops->DataDigest) {
2287 iov[niov].iov_base = &checksum;
2288 iov[niov++].iov_len = ISCSI_CRC_LEN;
2289 rx_size += ISCSI_CRC_LEN;
2290 }
2291
2292 WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
2293 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2294 if (rx_got != rx_size)
2295 goto reject;
2296
2297 if (conn->conn_ops->DataDigest) {
2298 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2299 text_in, rx_size, 0, NULL,
2300 &data_crc);
2301
2302 if (checksum != data_crc) {
2303 pr_err("Text data CRC32C DataDigest"
2304 " 0x%08x does not match computed"
2305 " 0x%08x\n", checksum, data_crc);
2306 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2307 pr_err("Unable to recover from"
2308 " Text Data digest failure while in"
2309 " ERL=0.\n");
2310 goto reject;
2311 } else {
2312 /*
2313 * Silently drop this PDU and let the
2314 * initiator plug the CmdSN gap.
2315 */
2316 pr_debug("Dropping Text"
2317 " Command CmdSN: 0x%08x due to"
2318 " DataCRC error.\n", hdr->cmdsn);
2319 kfree(text_in);
2320 return 0;
2321 }
2322 } else {
2323 pr_debug("Got CRC32C DataDigest"
2324 " 0x%08x for %u bytes of text data.\n",
2325 checksum, payload_length);
2326 }
2327 }
2328 text_in[payload_length - 1] = '\0';
2329 pr_debug("Successfully read %d bytes of text"
2330 " data.\n", payload_length);
2331 }
2332
2333 return iscsit_process_text_cmd(conn, cmd, hdr);
2334
2335 reject:
2336 kfree(cmd->text_in_ptr);
2337 cmd->text_in_ptr = NULL;
2338 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2339 }
2340
iscsit_logout_closesession(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2341 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2342 {
2343 struct iscsi_conn *conn_p;
2344 struct iscsi_session *sess = conn->sess;
2345
2346 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2347 " for SID: %u.\n", conn->cid, conn->sess->sid);
2348
2349 atomic_set(&sess->session_logout, 1);
2350 atomic_set(&conn->conn_logout_remove, 1);
2351 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2352
2353 iscsit_inc_conn_usage_count(conn);
2354 iscsit_inc_session_usage_count(sess);
2355
2356 spin_lock_bh(&sess->conn_lock);
2357 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2358 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2359 continue;
2360
2361 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2362 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2363 }
2364 spin_unlock_bh(&sess->conn_lock);
2365
2366 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2367
2368 return 0;
2369 }
2370
iscsit_logout_closeconnection(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2371 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2372 {
2373 struct iscsi_conn *l_conn;
2374 struct iscsi_session *sess = conn->sess;
2375
2376 pr_debug("Received logout request CLOSECONNECTION for CID:"
2377 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2378
2379 /*
2380 * A Logout Request with a CLOSECONNECTION reason code for a CID
2381 * can arrive on a connection with a differing CID.
2382 */
2383 if (conn->cid == cmd->logout_cid) {
2384 spin_lock_bh(&conn->state_lock);
2385 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2386 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2387
2388 atomic_set(&conn->conn_logout_remove, 1);
2389 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2390 iscsit_inc_conn_usage_count(conn);
2391
2392 spin_unlock_bh(&conn->state_lock);
2393 } else {
2394 /*
2395 * Handle all different cid CLOSECONNECTION requests in
2396 * iscsit_logout_post_handler_diffcid() as to give enough
2397 * time for any non immediate command's CmdSN to be
2398 * acknowledged on the connection in question.
2399 *
2400 * Here we simply make sure the CID is still around.
2401 */
2402 l_conn = iscsit_get_conn_from_cid(sess,
2403 cmd->logout_cid);
2404 if (!l_conn) {
2405 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2406 iscsit_add_cmd_to_response_queue(cmd, conn,
2407 cmd->i_state);
2408 return 0;
2409 }
2410
2411 iscsit_dec_conn_usage_count(l_conn);
2412 }
2413
2414 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2415
2416 return 0;
2417 }
2418
iscsit_logout_removeconnforrecovery(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2419 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2420 {
2421 struct iscsi_session *sess = conn->sess;
2422
2423 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2424 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2425
2426 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2427 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2428 " while ERL!=2.\n");
2429 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2430 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2431 return 0;
2432 }
2433
2434 if (conn->cid == cmd->logout_cid) {
2435 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2436 " with CID: %hu on CID: %hu, implementation error.\n",
2437 cmd->logout_cid, conn->cid);
2438 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2439 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2440 return 0;
2441 }
2442
2443 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2444
2445 return 0;
2446 }
2447
2448 int
iscsit_handle_logout_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf)2449 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2450 unsigned char *buf)
2451 {
2452 int cmdsn_ret, logout_remove = 0;
2453 u8 reason_code = 0;
2454 struct iscsi_logout *hdr;
2455 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2456
2457 hdr = (struct iscsi_logout *) buf;
2458 reason_code = (hdr->flags & 0x7f);
2459
2460 if (tiqn) {
2461 spin_lock(&tiqn->logout_stats.lock);
2462 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2463 tiqn->logout_stats.normal_logouts++;
2464 else
2465 tiqn->logout_stats.abnormal_logouts++;
2466 spin_unlock(&tiqn->logout_stats.lock);
2467 }
2468
2469 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2470 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2471 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2472 hdr->cid, conn->cid);
2473
2474 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2475 pr_err("Received logout request on connection that"
2476 " is not in logged in state, ignoring request.\n");
2477 iscsit_free_cmd(cmd, false);
2478 return 0;
2479 }
2480
2481 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2482 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2483 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2484 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2485 cmd->targ_xfer_tag = 0xFFFFFFFF;
2486 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2487 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2488 cmd->logout_cid = be16_to_cpu(hdr->cid);
2489 cmd->logout_reason = reason_code;
2490 cmd->data_direction = DMA_NONE;
2491
2492 /*
2493 * We need to sleep in these cases (by returning 1) until the Logout
2494 * Response gets sent in the tx thread.
2495 */
2496 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2497 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2498 be16_to_cpu(hdr->cid) == conn->cid))
2499 logout_remove = 1;
2500
2501 spin_lock_bh(&conn->cmd_lock);
2502 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2503 spin_unlock_bh(&conn->cmd_lock);
2504
2505 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2506 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2507
2508 /*
2509 * Immediate commands are executed, well, immediately.
2510 * Non-Immediate Logout Commands are executed in CmdSN order.
2511 */
2512 if (cmd->immediate_cmd) {
2513 int ret = iscsit_execute_cmd(cmd, 0);
2514
2515 if (ret < 0)
2516 return ret;
2517 } else {
2518 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2519 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2520 logout_remove = 0;
2521 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2522 return -1;
2523 }
2524
2525 return logout_remove;
2526 }
2527 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2528
iscsit_handle_snack(struct iscsi_conn * conn,unsigned char * buf)2529 int iscsit_handle_snack(
2530 struct iscsi_conn *conn,
2531 unsigned char *buf)
2532 {
2533 struct iscsi_snack *hdr;
2534
2535 hdr = (struct iscsi_snack *) buf;
2536 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2537
2538 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2539 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2540 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2541 hdr->begrun, hdr->runlength, conn->cid);
2542
2543 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2544 pr_err("Initiator sent SNACK request while in"
2545 " ErrorRecoveryLevel=0.\n");
2546 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2547 buf);
2548 }
2549 /*
2550 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2551 * call from inside iscsi_send_recovery_datain_or_r2t().
2552 */
2553 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2554 case 0:
2555 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2556 hdr->itt,
2557 be32_to_cpu(hdr->ttt),
2558 be32_to_cpu(hdr->begrun),
2559 be32_to_cpu(hdr->runlength));
2560 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2561 return iscsit_handle_status_snack(conn, hdr->itt,
2562 be32_to_cpu(hdr->ttt),
2563 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2564 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2565 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2566 be32_to_cpu(hdr->begrun),
2567 be32_to_cpu(hdr->runlength));
2568 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2569 /* FIXME: Support R-Data SNACK */
2570 pr_err("R-Data SNACK Not Supported.\n");
2571 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2572 buf);
2573 default:
2574 pr_err("Unknown SNACK type 0x%02x, protocol"
2575 " error.\n", hdr->flags & 0x0f);
2576 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2577 buf);
2578 }
2579
2580 return 0;
2581 }
2582 EXPORT_SYMBOL(iscsit_handle_snack);
2583
iscsit_rx_thread_wait_for_tcp(struct iscsi_conn * conn)2584 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2585 {
2586 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2587 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2588 wait_for_completion_interruptible_timeout(
2589 &conn->rx_half_close_comp,
2590 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2591 }
2592 }
2593
iscsit_handle_immediate_data(struct iscsi_cmd * cmd,struct iscsi_scsi_req * hdr,u32 length)2594 static int iscsit_handle_immediate_data(
2595 struct iscsi_cmd *cmd,
2596 struct iscsi_scsi_req *hdr,
2597 u32 length)
2598 {
2599 int iov_ret, rx_got = 0, rx_size = 0;
2600 u32 checksum, iov_count = 0, padding = 0;
2601 struct iscsi_conn *conn = cmd->conn;
2602 struct kvec *iov;
2603 void *overflow_buf = NULL;
2604
2605 BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
2606 rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
2607 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
2608 cmd->orig_iov_data_count - 2,
2609 cmd->write_data_done, rx_size);
2610 if (iov_ret < 0)
2611 return IMMEDIATE_DATA_CANNOT_RECOVER;
2612
2613 iov_count = iov_ret;
2614 iov = &cmd->iov_data[0];
2615 if (rx_size < length) {
2616 /*
2617 * Special case: length of immediate data exceeds the data
2618 * buffer size derived from the CDB.
2619 */
2620 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
2621 if (!overflow_buf) {
2622 iscsit_unmap_iovec(cmd);
2623 return IMMEDIATE_DATA_CANNOT_RECOVER;
2624 }
2625 cmd->overflow_buf = overflow_buf;
2626 iov[iov_count].iov_base = overflow_buf;
2627 iov[iov_count].iov_len = length - rx_size;
2628 iov_count++;
2629 rx_size = length;
2630 }
2631
2632 padding = ((-length) & 3);
2633 if (padding != 0) {
2634 iov[iov_count].iov_base = cmd->pad_bytes;
2635 iov[iov_count++].iov_len = padding;
2636 rx_size += padding;
2637 }
2638
2639 if (conn->conn_ops->DataDigest) {
2640 iov[iov_count].iov_base = &checksum;
2641 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2642 rx_size += ISCSI_CRC_LEN;
2643 }
2644
2645 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
2646 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2647
2648 iscsit_unmap_iovec(cmd);
2649
2650 if (rx_got != rx_size) {
2651 iscsit_rx_thread_wait_for_tcp(conn);
2652 return IMMEDIATE_DATA_CANNOT_RECOVER;
2653 }
2654
2655 if (conn->conn_ops->DataDigest) {
2656 u32 data_crc;
2657
2658 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2659 cmd->write_data_done, length, padding,
2660 cmd->pad_bytes);
2661
2662 if (checksum != data_crc) {
2663 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2664 " does not match computed 0x%08x\n", checksum,
2665 data_crc);
2666
2667 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2668 pr_err("Unable to recover from"
2669 " Immediate Data digest failure while"
2670 " in ERL=0.\n");
2671 iscsit_reject_cmd(cmd,
2672 ISCSI_REASON_DATA_DIGEST_ERROR,
2673 (unsigned char *)hdr);
2674 return IMMEDIATE_DATA_CANNOT_RECOVER;
2675 } else {
2676 iscsit_reject_cmd(cmd,
2677 ISCSI_REASON_DATA_DIGEST_ERROR,
2678 (unsigned char *)hdr);
2679 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2680 }
2681 } else {
2682 pr_debug("Got CRC32C DataDigest 0x%08x for"
2683 " %u bytes of Immediate Data\n", checksum,
2684 length);
2685 }
2686 }
2687
2688 cmd->write_data_done += length;
2689
2690 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2691 spin_lock_bh(&cmd->istate_lock);
2692 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2693 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2694 spin_unlock_bh(&cmd->istate_lock);
2695 }
2696
2697 return IMMEDIATE_DATA_NORMAL_OPERATION;
2698 }
2699
2700 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2701 with active network interface */
iscsit_build_conn_drop_async_message(struct iscsi_conn * conn)2702 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2703 {
2704 struct iscsi_cmd *cmd;
2705 struct iscsi_conn *conn_p;
2706 bool found = false;
2707
2708 lockdep_assert_held(&conn->sess->conn_lock);
2709
2710 /*
2711 * Only send a Asynchronous Message on connections whos network
2712 * interface is still functional.
2713 */
2714 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2715 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2716 iscsit_inc_conn_usage_count(conn_p);
2717 found = true;
2718 break;
2719 }
2720 }
2721
2722 if (!found)
2723 return;
2724
2725 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2726 if (!cmd) {
2727 iscsit_dec_conn_usage_count(conn_p);
2728 return;
2729 }
2730
2731 cmd->logout_cid = conn->cid;
2732 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2733 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2734
2735 spin_lock_bh(&conn_p->cmd_lock);
2736 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2737 spin_unlock_bh(&conn_p->cmd_lock);
2738
2739 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2740 iscsit_dec_conn_usage_count(conn_p);
2741 }
2742
iscsit_send_conn_drop_async_message(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2743 static int iscsit_send_conn_drop_async_message(
2744 struct iscsi_cmd *cmd,
2745 struct iscsi_conn *conn)
2746 {
2747 struct iscsi_async *hdr;
2748
2749 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2750
2751 hdr = (struct iscsi_async *) cmd->pdu;
2752 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2753 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2754 cmd->init_task_tag = RESERVED_ITT;
2755 cmd->targ_xfer_tag = 0xFFFFFFFF;
2756 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2757 cmd->stat_sn = conn->stat_sn++;
2758 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2759 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2760 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2761 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2762 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2763 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2764 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2765
2766 pr_debug("Sending Connection Dropped Async Message StatSN:"
2767 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2768 cmd->logout_cid, conn->cid);
2769
2770 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2771 }
2772
iscsit_tx_thread_wait_for_tcp(struct iscsi_conn * conn)2773 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2774 {
2775 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2776 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2777 wait_for_completion_interruptible_timeout(
2778 &conn->tx_half_close_comp,
2779 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2780 }
2781 }
2782
2783 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)2784 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2785 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2786 bool set_statsn)
2787 {
2788 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2789 hdr->flags = datain->flags;
2790 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2791 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2792 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2793 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2794 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2795 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2796 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2797 }
2798 }
2799 hton24(hdr->dlength, datain->length);
2800 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2801 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2802 (struct scsi_lun *)&hdr->lun);
2803 else
2804 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2805
2806 hdr->itt = cmd->init_task_tag;
2807
2808 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2809 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2810 else
2811 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2812 if (set_statsn)
2813 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2814 else
2815 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2816
2817 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2818 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2819 hdr->datasn = cpu_to_be32(datain->data_sn);
2820 hdr->offset = cpu_to_be32(datain->offset);
2821
2822 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2823 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2824 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2825 ntohl(hdr->offset), datain->length, conn->cid);
2826 }
2827 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2828
iscsit_send_datain(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2829 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2830 {
2831 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2832 struct iscsi_datain datain;
2833 struct iscsi_datain_req *dr;
2834 int eodr = 0, ret;
2835 bool set_statsn = false;
2836
2837 memset(&datain, 0, sizeof(struct iscsi_datain));
2838 dr = iscsit_get_datain_values(cmd, &datain);
2839 if (!dr) {
2840 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2841 cmd->init_task_tag);
2842 return -1;
2843 }
2844 /*
2845 * Be paranoid and double check the logic for now.
2846 */
2847 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2848 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2849 " datain.length: %u exceeds cmd->data_length: %u\n",
2850 cmd->init_task_tag, datain.offset, datain.length,
2851 cmd->se_cmd.data_length);
2852 return -1;
2853 }
2854
2855 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2856 /*
2857 * Special case for successfully execution w/ both DATAIN
2858 * and Sense Data.
2859 */
2860 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2861 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2862 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2863 else {
2864 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2865 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2866 iscsit_increment_maxcmdsn(cmd, conn->sess);
2867 cmd->stat_sn = conn->stat_sn++;
2868 set_statsn = true;
2869 } else if (dr->dr_complete ==
2870 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2871 set_statsn = true;
2872 }
2873
2874 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2875
2876 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2877 if (ret < 0)
2878 return ret;
2879
2880 if (dr->dr_complete) {
2881 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2882 2 : 1;
2883 iscsit_free_datain_req(cmd, dr);
2884 }
2885
2886 return eodr;
2887 }
2888
2889 int
iscsit_build_logout_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_logout_rsp * hdr)2890 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2891 struct iscsi_logout_rsp *hdr)
2892 {
2893 struct iscsi_conn *logout_conn = NULL;
2894 struct iscsi_conn_recovery *cr = NULL;
2895 struct iscsi_session *sess = conn->sess;
2896 /*
2897 * The actual shutting down of Sessions and/or Connections
2898 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2899 * is done in scsi_logout_post_handler().
2900 */
2901 switch (cmd->logout_reason) {
2902 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2903 pr_debug("iSCSI session logout successful, setting"
2904 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2905 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2906 break;
2907 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2908 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2909 break;
2910 /*
2911 * For CLOSECONNECTION logout requests carrying
2912 * a matching logout CID -> local CID, the reference
2913 * for the local CID will have been incremented in
2914 * iscsi_logout_closeconnection().
2915 *
2916 * For CLOSECONNECTION logout requests carrying
2917 * a different CID than the connection it arrived
2918 * on, the connection responding to cmd->logout_cid
2919 * is stopped in iscsit_logout_post_handler_diffcid().
2920 */
2921
2922 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2923 " successful.\n", cmd->logout_cid, conn->cid);
2924 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2925 break;
2926 case ISCSI_LOGOUT_REASON_RECOVERY:
2927 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2928 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2929 break;
2930 /*
2931 * If the connection is still active from our point of view
2932 * force connection recovery to occur.
2933 */
2934 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2935 cmd->logout_cid);
2936 if (logout_conn) {
2937 iscsit_connection_reinstatement_rcfr(logout_conn);
2938 iscsit_dec_conn_usage_count(logout_conn);
2939 }
2940
2941 cr = iscsit_get_inactive_connection_recovery_entry(
2942 conn->sess, cmd->logout_cid);
2943 if (!cr) {
2944 pr_err("Unable to locate CID: %hu for"
2945 " REMOVECONNFORRECOVERY Logout Request.\n",
2946 cmd->logout_cid);
2947 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2948 break;
2949 }
2950
2951 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2952
2953 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2954 " for recovery for CID: %hu on CID: %hu successful.\n",
2955 cmd->logout_cid, conn->cid);
2956 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2957 break;
2958 default:
2959 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2960 cmd->logout_reason);
2961 return -1;
2962 }
2963
2964 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2965 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2966 hdr->response = cmd->logout_response;
2967 hdr->itt = cmd->init_task_tag;
2968 cmd->stat_sn = conn->stat_sn++;
2969 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2970
2971 iscsit_increment_maxcmdsn(cmd, conn->sess);
2972 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2973 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2974
2975 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2976 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2977 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2978 cmd->logout_cid, conn->cid);
2979
2980 return 0;
2981 }
2982 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2983
2984 static int
iscsit_send_logout(struct iscsi_cmd * cmd,struct iscsi_conn * conn)2985 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2986 {
2987 int rc;
2988
2989 rc = iscsit_build_logout_rsp(cmd, conn,
2990 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2991 if (rc < 0)
2992 return rc;
2993
2994 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2995 }
2996
2997 void
iscsit_build_nopin_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_nopin * hdr,bool nopout_response)2998 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2999 struct iscsi_nopin *hdr, bool nopout_response)
3000 {
3001 hdr->opcode = ISCSI_OP_NOOP_IN;
3002 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3003 hton24(hdr->dlength, cmd->buf_ptr_size);
3004 if (nopout_response)
3005 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
3006 hdr->itt = cmd->init_task_tag;
3007 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3008 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
3009 conn->stat_sn;
3010 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3011
3012 if (nopout_response)
3013 iscsit_increment_maxcmdsn(cmd, conn->sess);
3014
3015 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3016 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3017
3018 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3019 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3020 "Solicited" : "Unsolicited", cmd->init_task_tag,
3021 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3022 }
3023 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3024
3025 /*
3026 * Unsolicited NOPIN, either requesting a response or not.
3027 */
iscsit_send_unsolicited_nopin(struct iscsi_cmd * cmd,struct iscsi_conn * conn,int want_response)3028 static int iscsit_send_unsolicited_nopin(
3029 struct iscsi_cmd *cmd,
3030 struct iscsi_conn *conn,
3031 int want_response)
3032 {
3033 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3034 int ret;
3035
3036 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3037
3038 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3039 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3040
3041 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3042 if (ret < 0)
3043 return ret;
3044
3045 spin_lock_bh(&cmd->istate_lock);
3046 cmd->i_state = want_response ?
3047 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3048 spin_unlock_bh(&cmd->istate_lock);
3049
3050 return 0;
3051 }
3052
3053 static int
iscsit_send_nopin(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3054 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3055 {
3056 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3057
3058 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3059
3060 /*
3061 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3062 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3063 */
3064 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3065
3066 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3067 cmd->buf_ptr,
3068 cmd->buf_ptr_size);
3069 }
3070
iscsit_send_r2t(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3071 static int iscsit_send_r2t(
3072 struct iscsi_cmd *cmd,
3073 struct iscsi_conn *conn)
3074 {
3075 struct iscsi_r2t *r2t;
3076 struct iscsi_r2t_rsp *hdr;
3077 int ret;
3078
3079 r2t = iscsit_get_r2t_from_list(cmd);
3080 if (!r2t)
3081 return -1;
3082
3083 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3084 memset(hdr, 0, ISCSI_HDR_LEN);
3085 hdr->opcode = ISCSI_OP_R2T;
3086 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3087 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3088 (struct scsi_lun *)&hdr->lun);
3089 hdr->itt = cmd->init_task_tag;
3090 if (conn->conn_transport->iscsit_get_r2t_ttt)
3091 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3092 else
3093 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3094 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3095 hdr->statsn = cpu_to_be32(conn->stat_sn);
3096 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3097 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3098 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3099 hdr->data_offset = cpu_to_be32(r2t->offset);
3100 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3101
3102 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3103 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3104 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3105 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3106 r2t->offset, r2t->xfer_len, conn->cid);
3107
3108 spin_lock_bh(&cmd->r2t_lock);
3109 r2t->sent_r2t = 1;
3110 spin_unlock_bh(&cmd->r2t_lock);
3111
3112 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3113 if (ret < 0) {
3114 return ret;
3115 }
3116
3117 spin_lock_bh(&cmd->dataout_timeout_lock);
3118 iscsit_start_dataout_timer(cmd, conn);
3119 spin_unlock_bh(&cmd->dataout_timeout_lock);
3120
3121 return 0;
3122 }
3123
3124 /*
3125 * @recovery: If called from iscsi_task_reassign_complete_write() for
3126 * connection recovery.
3127 */
iscsit_build_r2ts_for_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,bool recovery)3128 int iscsit_build_r2ts_for_cmd(
3129 struct iscsi_conn *conn,
3130 struct iscsi_cmd *cmd,
3131 bool recovery)
3132 {
3133 int first_r2t = 1;
3134 u32 offset = 0, xfer_len = 0;
3135
3136 spin_lock_bh(&cmd->r2t_lock);
3137 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3138 spin_unlock_bh(&cmd->r2t_lock);
3139 return 0;
3140 }
3141
3142 if (conn->sess->sess_ops->DataSequenceInOrder &&
3143 !recovery)
3144 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3145
3146 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3147 if (conn->sess->sess_ops->DataSequenceInOrder) {
3148 offset = cmd->r2t_offset;
3149
3150 if (first_r2t && recovery) {
3151 int new_data_end = offset +
3152 conn->sess->sess_ops->MaxBurstLength -
3153 cmd->next_burst_len;
3154
3155 if (new_data_end > cmd->se_cmd.data_length)
3156 xfer_len = cmd->se_cmd.data_length - offset;
3157 else
3158 xfer_len =
3159 conn->sess->sess_ops->MaxBurstLength -
3160 cmd->next_burst_len;
3161 } else {
3162 int new_data_end = offset +
3163 conn->sess->sess_ops->MaxBurstLength;
3164
3165 if (new_data_end > cmd->se_cmd.data_length)
3166 xfer_len = cmd->se_cmd.data_length - offset;
3167 else
3168 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3169 }
3170
3171 if ((s32)xfer_len < 0) {
3172 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3173 break;
3174 }
3175
3176 cmd->r2t_offset += xfer_len;
3177
3178 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3179 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3180 } else {
3181 struct iscsi_seq *seq;
3182
3183 seq = iscsit_get_seq_holder_for_r2t(cmd);
3184 if (!seq) {
3185 spin_unlock_bh(&cmd->r2t_lock);
3186 return -1;
3187 }
3188
3189 offset = seq->offset;
3190 xfer_len = seq->xfer_len;
3191
3192 if (cmd->seq_send_order == cmd->seq_count)
3193 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3194 }
3195 cmd->outstanding_r2ts++;
3196 first_r2t = 0;
3197
3198 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3199 spin_unlock_bh(&cmd->r2t_lock);
3200 return -1;
3201 }
3202
3203 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3204 break;
3205 }
3206 spin_unlock_bh(&cmd->r2t_lock);
3207
3208 return 0;
3209 }
3210 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3211
iscsit_build_rsp_pdu(struct iscsi_cmd * cmd,struct iscsi_conn * conn,bool inc_stat_sn,struct iscsi_scsi_rsp * hdr)3212 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3213 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3214 {
3215 if (inc_stat_sn)
3216 cmd->stat_sn = conn->stat_sn++;
3217
3218 atomic_long_inc(&conn->sess->rsp_pdus);
3219
3220 memset(hdr, 0, ISCSI_HDR_LEN);
3221 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3222 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3223 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3224 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3225 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3226 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3227 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3228 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3229 }
3230 hdr->response = cmd->iscsi_response;
3231 hdr->cmd_status = cmd->se_cmd.scsi_status;
3232 hdr->itt = cmd->init_task_tag;
3233 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3234
3235 iscsit_increment_maxcmdsn(cmd, conn->sess);
3236 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3237 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3238
3239 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3240 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3241 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3242 cmd->se_cmd.scsi_status, conn->cid);
3243 }
3244 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3245
iscsit_send_response(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3246 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3247 {
3248 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3249 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3250 void *data_buf = NULL;
3251 u32 padding = 0, data_buf_len = 0;
3252
3253 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3254
3255 /*
3256 * Attach SENSE DATA payload to iSCSI Response PDU
3257 */
3258 if (cmd->se_cmd.sense_buffer &&
3259 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3260 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3261 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3262 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3263
3264 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3265 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3266 data_buf = cmd->sense_buffer;
3267 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3268
3269 if (padding) {
3270 memset(cmd->sense_buffer +
3271 cmd->se_cmd.scsi_sense_length, 0, padding);
3272 pr_debug("Adding %u bytes of padding to"
3273 " SENSE.\n", padding);
3274 }
3275
3276 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3277 " Response PDU\n",
3278 cmd->se_cmd.scsi_sense_length);
3279 }
3280
3281 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3282 data_buf_len);
3283 }
3284
iscsit_convert_tcm_tmr_rsp(struct se_tmr_req * se_tmr)3285 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3286 {
3287 switch (se_tmr->response) {
3288 case TMR_FUNCTION_COMPLETE:
3289 return ISCSI_TMF_RSP_COMPLETE;
3290 case TMR_TASK_DOES_NOT_EXIST:
3291 return ISCSI_TMF_RSP_NO_TASK;
3292 case TMR_LUN_DOES_NOT_EXIST:
3293 return ISCSI_TMF_RSP_NO_LUN;
3294 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3295 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3296 case TMR_FUNCTION_REJECTED:
3297 default:
3298 return ISCSI_TMF_RSP_REJECTED;
3299 }
3300 }
3301
3302 void
iscsit_build_task_mgt_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_tm_rsp * hdr)3303 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3304 struct iscsi_tm_rsp *hdr)
3305 {
3306 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3307
3308 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3309 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3310 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3311 hdr->itt = cmd->init_task_tag;
3312 cmd->stat_sn = conn->stat_sn++;
3313 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3314
3315 iscsit_increment_maxcmdsn(cmd, conn->sess);
3316 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3317 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3318
3319 pr_debug("Built Task Management Response ITT: 0x%08x,"
3320 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3321 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3322 }
3323 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3324
3325 static int
iscsit_send_task_mgt_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3326 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3327 {
3328 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3329
3330 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3331
3332 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3333 }
3334
3335 #define SENDTARGETS_BUF_LIMIT 32768U
3336
3337 static int
iscsit_build_sendtargets_response(struct iscsi_cmd * cmd,enum iscsit_transport_type network_transport,int skip_bytes,bool * completed)3338 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3339 enum iscsit_transport_type network_transport,
3340 int skip_bytes, bool *completed)
3341 {
3342 char *payload = NULL;
3343 struct iscsi_conn *conn = cmd->conn;
3344 struct iscsi_portal_group *tpg;
3345 struct iscsi_tiqn *tiqn;
3346 struct iscsi_tpg_np *tpg_np;
3347 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3348 int target_name_printed;
3349 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3350 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3351 bool active;
3352
3353 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3354 SENDTARGETS_BUF_LIMIT);
3355
3356 payload = kzalloc(buffer_len, GFP_KERNEL);
3357 if (!payload)
3358 return -ENOMEM;
3359
3360 /*
3361 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3362 * explicit case..
3363 */
3364 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3365 text_ptr = strchr(text_in, '=');
3366 if (!text_ptr) {
3367 pr_err("Unable to locate '=' string in text_in:"
3368 " %s\n", text_in);
3369 kfree(payload);
3370 return -EINVAL;
3371 }
3372 /*
3373 * Skip over '=' character..
3374 */
3375 text_ptr += 1;
3376 }
3377
3378 spin_lock(&tiqn_lock);
3379 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3380 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3381 strcmp(tiqn->tiqn, text_ptr)) {
3382 continue;
3383 }
3384
3385 target_name_printed = 0;
3386
3387 spin_lock(&tiqn->tiqn_tpg_lock);
3388 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3389
3390 /* If demo_mode_discovery=0 and generate_node_acls=0
3391 * (demo mode dislabed) do not return
3392 * TargetName+TargetAddress unless a NodeACL exists.
3393 */
3394
3395 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3396 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3397 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3398 cmd->conn->sess->sess_ops->InitiatorName))) {
3399 continue;
3400 }
3401
3402 spin_lock(&tpg->tpg_state_lock);
3403 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3404 spin_unlock(&tpg->tpg_state_lock);
3405
3406 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3407 continue;
3408
3409 spin_lock(&tpg->tpg_np_lock);
3410 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3411 tpg_np_list) {
3412 struct iscsi_np *np = tpg_np->tpg_np;
3413 struct sockaddr_storage *sockaddr;
3414
3415 if (np->np_network_transport != network_transport)
3416 continue;
3417
3418 if (!target_name_printed) {
3419 len = sprintf(buf, "TargetName=%s",
3420 tiqn->tiqn);
3421 len += 1;
3422
3423 if ((len + payload_len) > buffer_len) {
3424 spin_unlock(&tpg->tpg_np_lock);
3425 spin_unlock(&tiqn->tiqn_tpg_lock);
3426 end_of_buf = 1;
3427 goto eob;
3428 }
3429
3430 if (skip_bytes && len <= skip_bytes) {
3431 skip_bytes -= len;
3432 } else {
3433 memcpy(payload + payload_len, buf, len);
3434 payload_len += len;
3435 target_name_printed = 1;
3436 if (len > skip_bytes)
3437 skip_bytes = 0;
3438 }
3439 }
3440
3441 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3442 sockaddr = &conn->local_sockaddr;
3443 else
3444 sockaddr = &np->np_sockaddr;
3445
3446 len = sprintf(buf, "TargetAddress="
3447 "%pISpc,%hu",
3448 sockaddr,
3449 tpg->tpgt);
3450 len += 1;
3451
3452 if ((len + payload_len) > buffer_len) {
3453 spin_unlock(&tpg->tpg_np_lock);
3454 spin_unlock(&tiqn->tiqn_tpg_lock);
3455 end_of_buf = 1;
3456 goto eob;
3457 }
3458
3459 if (skip_bytes && len <= skip_bytes) {
3460 skip_bytes -= len;
3461 } else {
3462 memcpy(payload + payload_len, buf, len);
3463 payload_len += len;
3464 if (len > skip_bytes)
3465 skip_bytes = 0;
3466 }
3467 }
3468 spin_unlock(&tpg->tpg_np_lock);
3469 }
3470 spin_unlock(&tiqn->tiqn_tpg_lock);
3471 eob:
3472 if (end_of_buf) {
3473 *completed = false;
3474 break;
3475 }
3476
3477 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3478 break;
3479 }
3480 spin_unlock(&tiqn_lock);
3481
3482 cmd->buf_ptr = payload;
3483
3484 return payload_len;
3485 }
3486
3487 int
iscsit_build_text_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_text_rsp * hdr,enum iscsit_transport_type network_transport)3488 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3489 struct iscsi_text_rsp *hdr,
3490 enum iscsit_transport_type network_transport)
3491 {
3492 int text_length, padding;
3493 bool completed = true;
3494
3495 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3496 cmd->read_data_done,
3497 &completed);
3498 if (text_length < 0)
3499 return text_length;
3500
3501 if (completed) {
3502 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3503 } else {
3504 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3505 cmd->read_data_done += text_length;
3506 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3507 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3508 }
3509 hdr->opcode = ISCSI_OP_TEXT_RSP;
3510 padding = ((-text_length) & 3);
3511 hton24(hdr->dlength, text_length);
3512 hdr->itt = cmd->init_task_tag;
3513 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3514 cmd->stat_sn = conn->stat_sn++;
3515 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3516
3517 iscsit_increment_maxcmdsn(cmd, conn->sess);
3518 /*
3519 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3520 * correctly increment MaxCmdSN for each response answering a
3521 * non immediate text request with a valid CmdSN.
3522 */
3523 cmd->maxcmdsn_inc = 0;
3524 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3525 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3526
3527 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3528 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3529 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3530 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3531 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3532
3533 return text_length + padding;
3534 }
3535 EXPORT_SYMBOL(iscsit_build_text_rsp);
3536
iscsit_send_text_rsp(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3537 static int iscsit_send_text_rsp(
3538 struct iscsi_cmd *cmd,
3539 struct iscsi_conn *conn)
3540 {
3541 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3542 int text_length;
3543
3544 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3545 conn->conn_transport->transport_type);
3546 if (text_length < 0)
3547 return text_length;
3548
3549 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3550 cmd->buf_ptr,
3551 text_length);
3552 }
3553
3554 void
iscsit_build_reject(struct iscsi_cmd * cmd,struct iscsi_conn * conn,struct iscsi_reject * hdr)3555 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3556 struct iscsi_reject *hdr)
3557 {
3558 hdr->opcode = ISCSI_OP_REJECT;
3559 hdr->reason = cmd->reject_reason;
3560 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3561 hton24(hdr->dlength, ISCSI_HDR_LEN);
3562 hdr->ffffffff = cpu_to_be32(0xffffffff);
3563 cmd->stat_sn = conn->stat_sn++;
3564 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3565 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3566 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3567
3568 }
3569 EXPORT_SYMBOL(iscsit_build_reject);
3570
iscsit_send_reject(struct iscsi_cmd * cmd,struct iscsi_conn * conn)3571 static int iscsit_send_reject(
3572 struct iscsi_cmd *cmd,
3573 struct iscsi_conn *conn)
3574 {
3575 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3576
3577 iscsit_build_reject(cmd, conn, hdr);
3578
3579 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3580 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3581
3582 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3583 cmd->buf_ptr,
3584 ISCSI_HDR_LEN);
3585 }
3586
iscsit_thread_get_cpumask(struct iscsi_conn * conn)3587 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3588 {
3589 int ord, cpu;
3590 /*
3591 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3592 * within iscsit_start_kthreads()
3593 *
3594 * Here we use bitmap_id to determine which CPU that this
3595 * iSCSI connection's RX/TX threads will be scheduled to
3596 * execute upon.
3597 */
3598 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3599 for_each_online_cpu(cpu) {
3600 if (ord-- == 0) {
3601 cpumask_set_cpu(cpu, conn->conn_cpumask);
3602 return;
3603 }
3604 }
3605 /*
3606 * This should never be reached..
3607 */
3608 dump_stack();
3609 cpumask_setall(conn->conn_cpumask);
3610 }
3611
3612 int
iscsit_immediate_queue(struct iscsi_conn * conn,struct iscsi_cmd * cmd,int state)3613 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3614 {
3615 int ret;
3616
3617 switch (state) {
3618 case ISTATE_SEND_R2T:
3619 ret = iscsit_send_r2t(cmd, conn);
3620 if (ret < 0)
3621 goto err;
3622 break;
3623 case ISTATE_REMOVE:
3624 spin_lock_bh(&conn->cmd_lock);
3625 list_del_init(&cmd->i_conn_node);
3626 spin_unlock_bh(&conn->cmd_lock);
3627
3628 iscsit_free_cmd(cmd, false);
3629 break;
3630 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3631 iscsit_mod_nopin_response_timer(conn);
3632 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3633 if (ret < 0)
3634 goto err;
3635 break;
3636 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3637 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3638 if (ret < 0)
3639 goto err;
3640 break;
3641 default:
3642 pr_err("Unknown Opcode: 0x%02x ITT:"
3643 " 0x%08x, i_state: %d on CID: %hu\n",
3644 cmd->iscsi_opcode, cmd->init_task_tag, state,
3645 conn->cid);
3646 goto err;
3647 }
3648
3649 return 0;
3650
3651 err:
3652 return -1;
3653 }
3654 EXPORT_SYMBOL(iscsit_immediate_queue);
3655
3656 static int
iscsit_handle_immediate_queue(struct iscsi_conn * conn)3657 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3658 {
3659 struct iscsit_transport *t = conn->conn_transport;
3660 struct iscsi_queue_req *qr;
3661 struct iscsi_cmd *cmd;
3662 u8 state;
3663 int ret;
3664
3665 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3666 atomic_set(&conn->check_immediate_queue, 0);
3667 cmd = qr->cmd;
3668 state = qr->state;
3669 kmem_cache_free(lio_qr_cache, qr);
3670
3671 ret = t->iscsit_immediate_queue(conn, cmd, state);
3672 if (ret < 0)
3673 return ret;
3674 }
3675
3676 return 0;
3677 }
3678
3679 int
iscsit_response_queue(struct iscsi_conn * conn,struct iscsi_cmd * cmd,int state)3680 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3681 {
3682 int ret;
3683
3684 check_rsp_state:
3685 switch (state) {
3686 case ISTATE_SEND_DATAIN:
3687 ret = iscsit_send_datain(cmd, conn);
3688 if (ret < 0)
3689 goto err;
3690 else if (!ret)
3691 /* more drs */
3692 goto check_rsp_state;
3693 else if (ret == 1) {
3694 /* all done */
3695 spin_lock_bh(&cmd->istate_lock);
3696 cmd->i_state = ISTATE_SENT_STATUS;
3697 spin_unlock_bh(&cmd->istate_lock);
3698
3699 if (atomic_read(&conn->check_immediate_queue))
3700 return 1;
3701
3702 return 0;
3703 } else if (ret == 2) {
3704 /* Still must send status,
3705 SCF_TRANSPORT_TASK_SENSE was set */
3706 spin_lock_bh(&cmd->istate_lock);
3707 cmd->i_state = ISTATE_SEND_STATUS;
3708 spin_unlock_bh(&cmd->istate_lock);
3709 state = ISTATE_SEND_STATUS;
3710 goto check_rsp_state;
3711 }
3712
3713 break;
3714 case ISTATE_SEND_STATUS:
3715 case ISTATE_SEND_STATUS_RECOVERY:
3716 ret = iscsit_send_response(cmd, conn);
3717 break;
3718 case ISTATE_SEND_LOGOUTRSP:
3719 ret = iscsit_send_logout(cmd, conn);
3720 break;
3721 case ISTATE_SEND_ASYNCMSG:
3722 ret = iscsit_send_conn_drop_async_message(
3723 cmd, conn);
3724 break;
3725 case ISTATE_SEND_NOPIN:
3726 ret = iscsit_send_nopin(cmd, conn);
3727 break;
3728 case ISTATE_SEND_REJECT:
3729 ret = iscsit_send_reject(cmd, conn);
3730 break;
3731 case ISTATE_SEND_TASKMGTRSP:
3732 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3733 if (ret != 0)
3734 break;
3735 ret = iscsit_tmr_post_handler(cmd, conn);
3736 if (ret != 0)
3737 iscsit_fall_back_to_erl0(conn->sess);
3738 break;
3739 case ISTATE_SEND_TEXTRSP:
3740 ret = iscsit_send_text_rsp(cmd, conn);
3741 break;
3742 default:
3743 pr_err("Unknown Opcode: 0x%02x ITT:"
3744 " 0x%08x, i_state: %d on CID: %hu\n",
3745 cmd->iscsi_opcode, cmd->init_task_tag,
3746 state, conn->cid);
3747 goto err;
3748 }
3749 if (ret < 0)
3750 goto err;
3751
3752 switch (state) {
3753 case ISTATE_SEND_LOGOUTRSP:
3754 if (!iscsit_logout_post_handler(cmd, conn))
3755 return -ECONNRESET;
3756 fallthrough;
3757 case ISTATE_SEND_STATUS:
3758 case ISTATE_SEND_ASYNCMSG:
3759 case ISTATE_SEND_NOPIN:
3760 case ISTATE_SEND_STATUS_RECOVERY:
3761 case ISTATE_SEND_TEXTRSP:
3762 case ISTATE_SEND_TASKMGTRSP:
3763 case ISTATE_SEND_REJECT:
3764 spin_lock_bh(&cmd->istate_lock);
3765 cmd->i_state = ISTATE_SENT_STATUS;
3766 spin_unlock_bh(&cmd->istate_lock);
3767 break;
3768 default:
3769 pr_err("Unknown Opcode: 0x%02x ITT:"
3770 " 0x%08x, i_state: %d on CID: %hu\n",
3771 cmd->iscsi_opcode, cmd->init_task_tag,
3772 cmd->i_state, conn->cid);
3773 goto err;
3774 }
3775
3776 if (atomic_read(&conn->check_immediate_queue))
3777 return 1;
3778
3779 return 0;
3780
3781 err:
3782 return -1;
3783 }
3784 EXPORT_SYMBOL(iscsit_response_queue);
3785
iscsit_handle_response_queue(struct iscsi_conn * conn)3786 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3787 {
3788 struct iscsit_transport *t = conn->conn_transport;
3789 struct iscsi_queue_req *qr;
3790 struct iscsi_cmd *cmd;
3791 u8 state;
3792 int ret;
3793
3794 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3795 cmd = qr->cmd;
3796 state = qr->state;
3797 kmem_cache_free(lio_qr_cache, qr);
3798
3799 ret = t->iscsit_response_queue(conn, cmd, state);
3800 if (ret == 1 || ret < 0)
3801 return ret;
3802 }
3803
3804 return 0;
3805 }
3806
iscsi_target_tx_thread(void * arg)3807 int iscsi_target_tx_thread(void *arg)
3808 {
3809 int ret = 0;
3810 struct iscsi_conn *conn = arg;
3811 bool conn_freed = false;
3812
3813 /*
3814 * Allow ourselves to be interrupted by SIGINT so that a
3815 * connection recovery / failure event can be triggered externally.
3816 */
3817 allow_signal(SIGINT);
3818
3819 while (!kthread_should_stop()) {
3820 /*
3821 * Ensure that both TX and RX per connection kthreads
3822 * are scheduled to run on the same CPU.
3823 */
3824 iscsit_thread_check_cpumask(conn, current, 1);
3825
3826 wait_event_interruptible(conn->queues_wq,
3827 !iscsit_conn_all_queues_empty(conn));
3828
3829 if (signal_pending(current))
3830 goto transport_err;
3831
3832 get_immediate:
3833 ret = iscsit_handle_immediate_queue(conn);
3834 if (ret < 0)
3835 goto transport_err;
3836
3837 ret = iscsit_handle_response_queue(conn);
3838 if (ret == 1) {
3839 goto get_immediate;
3840 } else if (ret == -ECONNRESET) {
3841 conn_freed = true;
3842 goto out;
3843 } else if (ret < 0) {
3844 goto transport_err;
3845 }
3846 }
3847
3848 transport_err:
3849 /*
3850 * Avoid the normal connection failure code-path if this connection
3851 * is still within LOGIN mode, and iscsi_np process context is
3852 * responsible for cleaning up the early connection failure.
3853 */
3854 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3855 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3856 out:
3857 if (!conn_freed) {
3858 while (!kthread_should_stop()) {
3859 msleep(100);
3860 }
3861 }
3862 return 0;
3863 }
3864
iscsi_target_rx_opcode(struct iscsi_conn * conn,unsigned char * buf)3865 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3866 {
3867 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3868 struct iscsi_cmd *cmd;
3869 int ret = 0;
3870
3871 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3872 case ISCSI_OP_SCSI_CMD:
3873 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3874 if (!cmd)
3875 goto reject;
3876
3877 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3878 break;
3879 case ISCSI_OP_SCSI_DATA_OUT:
3880 ret = iscsit_handle_data_out(conn, buf);
3881 break;
3882 case ISCSI_OP_NOOP_OUT:
3883 cmd = NULL;
3884 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3885 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3886 if (!cmd)
3887 goto reject;
3888 }
3889 ret = iscsit_handle_nop_out(conn, cmd, buf);
3890 break;
3891 case ISCSI_OP_SCSI_TMFUNC:
3892 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3893 if (!cmd)
3894 goto reject;
3895
3896 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3897 break;
3898 case ISCSI_OP_TEXT:
3899 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3900 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3901 if (!cmd)
3902 goto reject;
3903 } else {
3904 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3905 if (!cmd)
3906 goto reject;
3907 }
3908
3909 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3910 break;
3911 case ISCSI_OP_LOGOUT:
3912 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3913 if (!cmd)
3914 goto reject;
3915
3916 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3917 if (ret > 0)
3918 wait_for_completion_timeout(&conn->conn_logout_comp,
3919 SECONDS_FOR_LOGOUT_COMP * HZ);
3920 break;
3921 case ISCSI_OP_SNACK:
3922 ret = iscsit_handle_snack(conn, buf);
3923 break;
3924 default:
3925 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3926 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3927 pr_err("Cannot recover from unknown"
3928 " opcode while ERL=0, closing iSCSI connection.\n");
3929 return -1;
3930 }
3931 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3932 " closing iSCSI connection.\n");
3933 ret = -1;
3934 break;
3935 }
3936
3937 return ret;
3938 reject:
3939 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3940 }
3941
iscsi_target_check_conn_state(struct iscsi_conn * conn)3942 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3943 {
3944 bool ret;
3945
3946 spin_lock_bh(&conn->state_lock);
3947 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3948 spin_unlock_bh(&conn->state_lock);
3949
3950 return ret;
3951 }
3952
iscsit_get_rx_pdu(struct iscsi_conn * conn)3953 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3954 {
3955 int ret;
3956 u8 *buffer, opcode;
3957 u32 checksum = 0, digest = 0;
3958 struct kvec iov;
3959
3960 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3961 if (!buffer)
3962 return;
3963
3964 while (!kthread_should_stop()) {
3965 /*
3966 * Ensure that both TX and RX per connection kthreads
3967 * are scheduled to run on the same CPU.
3968 */
3969 iscsit_thread_check_cpumask(conn, current, 0);
3970
3971 memset(&iov, 0, sizeof(struct kvec));
3972
3973 iov.iov_base = buffer;
3974 iov.iov_len = ISCSI_HDR_LEN;
3975
3976 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3977 if (ret != ISCSI_HDR_LEN) {
3978 iscsit_rx_thread_wait_for_tcp(conn);
3979 break;
3980 }
3981
3982 if (conn->conn_ops->HeaderDigest) {
3983 iov.iov_base = &digest;
3984 iov.iov_len = ISCSI_CRC_LEN;
3985
3986 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3987 if (ret != ISCSI_CRC_LEN) {
3988 iscsit_rx_thread_wait_for_tcp(conn);
3989 break;
3990 }
3991
3992 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3993 ISCSI_HDR_LEN, 0, NULL,
3994 &checksum);
3995
3996 if (digest != checksum) {
3997 pr_err("HeaderDigest CRC32C failed,"
3998 " received 0x%08x, computed 0x%08x\n",
3999 digest, checksum);
4000 /*
4001 * Set the PDU to 0xff so it will intentionally
4002 * hit default in the switch below.
4003 */
4004 memset(buffer, 0xff, ISCSI_HDR_LEN);
4005 atomic_long_inc(&conn->sess->conn_digest_errors);
4006 } else {
4007 pr_debug("Got HeaderDigest CRC32C"
4008 " 0x%08x\n", checksum);
4009 }
4010 }
4011
4012 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4013 break;
4014
4015 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4016
4017 if (conn->sess->sess_ops->SessionType &&
4018 ((!(opcode & ISCSI_OP_TEXT)) ||
4019 (!(opcode & ISCSI_OP_LOGOUT)))) {
4020 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4021 " while in Discovery Session, rejecting.\n", opcode);
4022 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4023 buffer);
4024 break;
4025 }
4026
4027 ret = iscsi_target_rx_opcode(conn, buffer);
4028 if (ret < 0)
4029 break;
4030 }
4031
4032 kfree(buffer);
4033 }
4034
iscsi_target_rx_thread(void * arg)4035 int iscsi_target_rx_thread(void *arg)
4036 {
4037 int rc;
4038 struct iscsi_conn *conn = arg;
4039 bool conn_freed = false;
4040
4041 /*
4042 * Allow ourselves to be interrupted by SIGINT so that a
4043 * connection recovery / failure event can be triggered externally.
4044 */
4045 allow_signal(SIGINT);
4046 /*
4047 * Wait for iscsi_post_login_handler() to complete before allowing
4048 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4049 */
4050 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4051 if (rc < 0 || iscsi_target_check_conn_state(conn))
4052 goto out;
4053
4054 if (!conn->conn_transport->iscsit_get_rx_pdu)
4055 return 0;
4056
4057 conn->conn_transport->iscsit_get_rx_pdu(conn);
4058
4059 if (!signal_pending(current))
4060 atomic_set(&conn->transport_failed, 1);
4061 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4062
4063 out:
4064 if (!conn_freed) {
4065 while (!kthread_should_stop()) {
4066 msleep(100);
4067 }
4068 }
4069
4070 return 0;
4071 }
4072
iscsit_release_commands_from_conn(struct iscsi_conn * conn)4073 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4074 {
4075 LIST_HEAD(tmp_list);
4076 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4077 struct iscsi_session *sess = conn->sess;
4078 /*
4079 * We expect this function to only ever be called from either RX or TX
4080 * thread context via iscsit_close_connection() once the other context
4081 * has been reset -> returned sleeping pre-handler state.
4082 */
4083 spin_lock_bh(&conn->cmd_lock);
4084 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4085
4086 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4087 struct se_cmd *se_cmd = &cmd->se_cmd;
4088
4089 if (se_cmd->se_tfo != NULL) {
4090 spin_lock_irq(&se_cmd->t_state_lock);
4091 if (se_cmd->transport_state & CMD_T_ABORTED) {
4092 /*
4093 * LIO's abort path owns the cleanup for this,
4094 * so put it back on the list and let
4095 * aborted_task handle it.
4096 */
4097 list_move_tail(&cmd->i_conn_node,
4098 &conn->conn_cmd_list);
4099 } else {
4100 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4101 }
4102 spin_unlock_irq(&se_cmd->t_state_lock);
4103 }
4104 }
4105 spin_unlock_bh(&conn->cmd_lock);
4106
4107 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4108 list_del_init(&cmd->i_conn_node);
4109
4110 iscsit_increment_maxcmdsn(cmd, sess);
4111 iscsit_free_cmd(cmd, true);
4112
4113 }
4114 }
4115
iscsit_stop_timers_for_cmds(struct iscsi_conn * conn)4116 static void iscsit_stop_timers_for_cmds(
4117 struct iscsi_conn *conn)
4118 {
4119 struct iscsi_cmd *cmd;
4120
4121 spin_lock_bh(&conn->cmd_lock);
4122 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4123 if (cmd->data_direction == DMA_TO_DEVICE)
4124 iscsit_stop_dataout_timer(cmd);
4125 }
4126 spin_unlock_bh(&conn->cmd_lock);
4127 }
4128
iscsit_close_connection(struct iscsi_conn * conn)4129 int iscsit_close_connection(
4130 struct iscsi_conn *conn)
4131 {
4132 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4133 struct iscsi_session *sess = conn->sess;
4134
4135 pr_debug("Closing iSCSI connection CID %hu on SID:"
4136 " %u\n", conn->cid, sess->sid);
4137 /*
4138 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4139 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4140 * sleeping and the logout response never got sent because the
4141 * connection failed.
4142 *
4143 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4144 * to signal logout response TX interrupt completion. Go ahead and skip
4145 * this for iser since isert_rx_opcode() does not wait on logout failure,
4146 * and to avoid iscsi_conn pointer dereference in iser-target code.
4147 */
4148 if (!conn->conn_transport->rdma_shutdown)
4149 complete(&conn->conn_logout_comp);
4150
4151 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4152 if (conn->tx_thread &&
4153 cmpxchg(&conn->tx_thread_active, true, false)) {
4154 send_sig(SIGINT, conn->tx_thread, 1);
4155 kthread_stop(conn->tx_thread);
4156 }
4157 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4158 if (conn->rx_thread &&
4159 cmpxchg(&conn->rx_thread_active, true, false)) {
4160 send_sig(SIGINT, conn->rx_thread, 1);
4161 kthread_stop(conn->rx_thread);
4162 }
4163 }
4164
4165 spin_lock(&iscsit_global->ts_bitmap_lock);
4166 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4167 get_order(1));
4168 spin_unlock(&iscsit_global->ts_bitmap_lock);
4169
4170 iscsit_stop_timers_for_cmds(conn);
4171 iscsit_stop_nopin_response_timer(conn);
4172 iscsit_stop_nopin_timer(conn);
4173
4174 if (conn->conn_transport->iscsit_wait_conn)
4175 conn->conn_transport->iscsit_wait_conn(conn);
4176
4177 /*
4178 * During Connection recovery drop unacknowledged out of order
4179 * commands for this connection, and prepare the other commands
4180 * for reallegiance.
4181 *
4182 * During normal operation clear the out of order commands (but
4183 * do not free the struct iscsi_ooo_cmdsn's) and release all
4184 * struct iscsi_cmds.
4185 */
4186 if (atomic_read(&conn->connection_recovery)) {
4187 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4188 iscsit_prepare_cmds_for_reallegiance(conn);
4189 } else {
4190 iscsit_clear_ooo_cmdsns_for_conn(conn);
4191 iscsit_release_commands_from_conn(conn);
4192 }
4193 iscsit_free_queue_reqs_for_conn(conn);
4194
4195 /*
4196 * Handle decrementing session or connection usage count if
4197 * a logout response was not able to be sent because the
4198 * connection failed. Fall back to Session Recovery here.
4199 */
4200 if (atomic_read(&conn->conn_logout_remove)) {
4201 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4202 iscsit_dec_conn_usage_count(conn);
4203 iscsit_dec_session_usage_count(sess);
4204 }
4205 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4206 iscsit_dec_conn_usage_count(conn);
4207
4208 atomic_set(&conn->conn_logout_remove, 0);
4209 atomic_set(&sess->session_reinstatement, 0);
4210 atomic_set(&sess->session_fall_back_to_erl0, 1);
4211 }
4212
4213 spin_lock_bh(&sess->conn_lock);
4214 list_del(&conn->conn_list);
4215
4216 /*
4217 * Attempt to let the Initiator know this connection failed by
4218 * sending an Connection Dropped Async Message on another
4219 * active connection.
4220 */
4221 if (atomic_read(&conn->connection_recovery))
4222 iscsit_build_conn_drop_async_message(conn);
4223
4224 spin_unlock_bh(&sess->conn_lock);
4225
4226 /*
4227 * If connection reinstatement is being performed on this connection,
4228 * up the connection reinstatement semaphore that is being blocked on
4229 * in iscsit_cause_connection_reinstatement().
4230 */
4231 spin_lock_bh(&conn->state_lock);
4232 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4233 spin_unlock_bh(&conn->state_lock);
4234 complete(&conn->conn_wait_comp);
4235 wait_for_completion(&conn->conn_post_wait_comp);
4236 spin_lock_bh(&conn->state_lock);
4237 }
4238
4239 /*
4240 * If connection reinstatement is being performed on this connection
4241 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4242 * connection wait rcfr semaphore that is being blocked on
4243 * an iscsit_connection_reinstatement_rcfr().
4244 */
4245 if (atomic_read(&conn->connection_wait_rcfr)) {
4246 spin_unlock_bh(&conn->state_lock);
4247 complete(&conn->conn_wait_rcfr_comp);
4248 wait_for_completion(&conn->conn_post_wait_comp);
4249 spin_lock_bh(&conn->state_lock);
4250 }
4251 atomic_set(&conn->connection_reinstatement, 1);
4252 spin_unlock_bh(&conn->state_lock);
4253
4254 /*
4255 * If any other processes are accessing this connection pointer we
4256 * must wait until they have completed.
4257 */
4258 iscsit_check_conn_usage_count(conn);
4259
4260 ahash_request_free(conn->conn_tx_hash);
4261 if (conn->conn_rx_hash) {
4262 struct crypto_ahash *tfm;
4263
4264 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4265 ahash_request_free(conn->conn_rx_hash);
4266 crypto_free_ahash(tfm);
4267 }
4268
4269 if (conn->sock)
4270 sock_release(conn->sock);
4271
4272 if (conn->conn_transport->iscsit_free_conn)
4273 conn->conn_transport->iscsit_free_conn(conn);
4274
4275 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4276 conn->conn_state = TARG_CONN_STATE_FREE;
4277 iscsit_free_conn(conn);
4278
4279 spin_lock_bh(&sess->conn_lock);
4280 atomic_dec(&sess->nconn);
4281 pr_debug("Decremented iSCSI connection count to %hu from node:"
4282 " %s\n", atomic_read(&sess->nconn),
4283 sess->sess_ops->InitiatorName);
4284 /*
4285 * Make sure that if one connection fails in an non ERL=2 iSCSI
4286 * Session that they all fail.
4287 */
4288 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4289 !atomic_read(&sess->session_logout))
4290 atomic_set(&sess->session_fall_back_to_erl0, 1);
4291
4292 /*
4293 * If this was not the last connection in the session, and we are
4294 * performing session reinstatement or falling back to ERL=0, call
4295 * iscsit_stop_session() without sleeping to shutdown the other
4296 * active connections.
4297 */
4298 if (atomic_read(&sess->nconn)) {
4299 if (!atomic_read(&sess->session_reinstatement) &&
4300 !atomic_read(&sess->session_fall_back_to_erl0)) {
4301 spin_unlock_bh(&sess->conn_lock);
4302 return 0;
4303 }
4304 if (!atomic_read(&sess->session_stop_active)) {
4305 atomic_set(&sess->session_stop_active, 1);
4306 spin_unlock_bh(&sess->conn_lock);
4307 iscsit_stop_session(sess, 0, 0);
4308 return 0;
4309 }
4310 spin_unlock_bh(&sess->conn_lock);
4311 return 0;
4312 }
4313
4314 /*
4315 * If this was the last connection in the session and one of the
4316 * following is occurring:
4317 *
4318 * Session Reinstatement is not being performed, and are falling back
4319 * to ERL=0 call iscsit_close_session().
4320 *
4321 * Session Logout was requested. iscsit_close_session() will be called
4322 * elsewhere.
4323 *
4324 * Session Continuation is not being performed, start the Time2Retain
4325 * handler and check if sleep_on_sess_wait_sem is active.
4326 */
4327 if (!atomic_read(&sess->session_reinstatement) &&
4328 atomic_read(&sess->session_fall_back_to_erl0)) {
4329 spin_unlock_bh(&sess->conn_lock);
4330 complete_all(&sess->session_wait_comp);
4331 iscsit_close_session(sess, true);
4332
4333 return 0;
4334 } else if (atomic_read(&sess->session_logout)) {
4335 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4336 sess->session_state = TARG_SESS_STATE_FREE;
4337
4338 if (atomic_read(&sess->session_close)) {
4339 spin_unlock_bh(&sess->conn_lock);
4340 complete_all(&sess->session_wait_comp);
4341 iscsit_close_session(sess, true);
4342 } else {
4343 spin_unlock_bh(&sess->conn_lock);
4344 }
4345
4346 return 0;
4347 } else {
4348 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4349 sess->session_state = TARG_SESS_STATE_FAILED;
4350
4351 if (!atomic_read(&sess->session_continuation))
4352 iscsit_start_time2retain_handler(sess);
4353
4354 if (atomic_read(&sess->session_close)) {
4355 spin_unlock_bh(&sess->conn_lock);
4356 complete_all(&sess->session_wait_comp);
4357 iscsit_close_session(sess, true);
4358 } else {
4359 spin_unlock_bh(&sess->conn_lock);
4360 }
4361
4362 return 0;
4363 }
4364 }
4365
4366 /*
4367 * If the iSCSI Session for the iSCSI Initiator Node exists,
4368 * forcefully shutdown the iSCSI NEXUS.
4369 */
iscsit_close_session(struct iscsi_session * sess,bool can_sleep)4370 int iscsit_close_session(struct iscsi_session *sess, bool can_sleep)
4371 {
4372 struct iscsi_portal_group *tpg = sess->tpg;
4373 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4374
4375 if (atomic_read(&sess->nconn)) {
4376 pr_err("%d connection(s) still exist for iSCSI session"
4377 " to %s\n", atomic_read(&sess->nconn),
4378 sess->sess_ops->InitiatorName);
4379 BUG();
4380 }
4381
4382 spin_lock_bh(&se_tpg->session_lock);
4383 atomic_set(&sess->session_logout, 1);
4384 atomic_set(&sess->session_reinstatement, 1);
4385 iscsit_stop_time2retain_timer(sess);
4386 spin_unlock_bh(&se_tpg->session_lock);
4387
4388 /*
4389 * transport_deregister_session_configfs() will clear the
4390 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4391 * can be setting it again with __transport_register_session() in
4392 * iscsi_post_login_handler() again after the iscsit_stop_session()
4393 * completes in iscsi_np context.
4394 */
4395 transport_deregister_session_configfs(sess->se_sess);
4396
4397 /*
4398 * If any other processes are accessing this session pointer we must
4399 * wait until they have completed. If we are in an interrupt (the
4400 * time2retain handler) and contain and active session usage count we
4401 * restart the timer and exit.
4402 */
4403 if (iscsit_check_session_usage_count(sess, can_sleep)) {
4404 atomic_set(&sess->session_logout, 0);
4405 iscsit_start_time2retain_handler(sess);
4406 return 0;
4407 }
4408
4409 transport_deregister_session(sess->se_sess);
4410
4411 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4412 iscsit_free_connection_recovery_entries(sess);
4413
4414 iscsit_free_all_ooo_cmdsns(sess);
4415
4416 spin_lock_bh(&se_tpg->session_lock);
4417 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4418 sess->session_state = TARG_SESS_STATE_FREE;
4419 pr_debug("Released iSCSI session from node: %s\n",
4420 sess->sess_ops->InitiatorName);
4421 tpg->nsessions--;
4422 if (tpg->tpg_tiqn)
4423 tpg->tpg_tiqn->tiqn_nsessions--;
4424
4425 pr_debug("Decremented number of active iSCSI Sessions on"
4426 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4427
4428 ida_free(&sess_ida, sess->session_index);
4429 kfree(sess->sess_ops);
4430 sess->sess_ops = NULL;
4431 spin_unlock_bh(&se_tpg->session_lock);
4432
4433 kfree(sess);
4434 return 0;
4435 }
4436
iscsit_logout_post_handler_closesession(struct iscsi_conn * conn)4437 static void iscsit_logout_post_handler_closesession(
4438 struct iscsi_conn *conn)
4439 {
4440 struct iscsi_session *sess = conn->sess;
4441 int sleep = 1;
4442 /*
4443 * Traditional iscsi/tcp will invoke this logic from TX thread
4444 * context during session logout, so clear tx_thread_active and
4445 * sleep if iscsit_close_connection() has not already occured.
4446 *
4447 * Since iser-target invokes this logic from it's own workqueue,
4448 * always sleep waiting for RX/TX thread shutdown to complete
4449 * within iscsit_close_connection().
4450 */
4451 if (!conn->conn_transport->rdma_shutdown) {
4452 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4453 if (!sleep)
4454 return;
4455 }
4456
4457 atomic_set(&conn->conn_logout_remove, 0);
4458 complete(&conn->conn_logout_comp);
4459
4460 iscsit_dec_conn_usage_count(conn);
4461 atomic_set(&sess->session_close, 1);
4462 iscsit_stop_session(sess, sleep, sleep);
4463 iscsit_dec_session_usage_count(sess);
4464 }
4465
iscsit_logout_post_handler_samecid(struct iscsi_conn * conn)4466 static void iscsit_logout_post_handler_samecid(
4467 struct iscsi_conn *conn)
4468 {
4469 int sleep = 1;
4470
4471 if (!conn->conn_transport->rdma_shutdown) {
4472 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4473 if (!sleep)
4474 return;
4475 }
4476
4477 atomic_set(&conn->conn_logout_remove, 0);
4478 complete(&conn->conn_logout_comp);
4479
4480 iscsit_cause_connection_reinstatement(conn, sleep);
4481 iscsit_dec_conn_usage_count(conn);
4482 }
4483
iscsit_logout_post_handler_diffcid(struct iscsi_conn * conn,u16 cid)4484 static void iscsit_logout_post_handler_diffcid(
4485 struct iscsi_conn *conn,
4486 u16 cid)
4487 {
4488 struct iscsi_conn *l_conn;
4489 struct iscsi_session *sess = conn->sess;
4490 bool conn_found = false;
4491
4492 if (!sess)
4493 return;
4494
4495 spin_lock_bh(&sess->conn_lock);
4496 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4497 if (l_conn->cid == cid) {
4498 iscsit_inc_conn_usage_count(l_conn);
4499 conn_found = true;
4500 break;
4501 }
4502 }
4503 spin_unlock_bh(&sess->conn_lock);
4504
4505 if (!conn_found)
4506 return;
4507
4508 if (l_conn->sock)
4509 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4510
4511 spin_lock_bh(&l_conn->state_lock);
4512 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4513 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4514 spin_unlock_bh(&l_conn->state_lock);
4515
4516 iscsit_cause_connection_reinstatement(l_conn, 1);
4517 iscsit_dec_conn_usage_count(l_conn);
4518 }
4519
4520 /*
4521 * Return of 0 causes the TX thread to restart.
4522 */
iscsit_logout_post_handler(struct iscsi_cmd * cmd,struct iscsi_conn * conn)4523 int iscsit_logout_post_handler(
4524 struct iscsi_cmd *cmd,
4525 struct iscsi_conn *conn)
4526 {
4527 int ret = 0;
4528
4529 switch (cmd->logout_reason) {
4530 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4531 switch (cmd->logout_response) {
4532 case ISCSI_LOGOUT_SUCCESS:
4533 case ISCSI_LOGOUT_CLEANUP_FAILED:
4534 default:
4535 iscsit_logout_post_handler_closesession(conn);
4536 break;
4537 }
4538 break;
4539 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4540 if (conn->cid == cmd->logout_cid) {
4541 switch (cmd->logout_response) {
4542 case ISCSI_LOGOUT_SUCCESS:
4543 case ISCSI_LOGOUT_CLEANUP_FAILED:
4544 default:
4545 iscsit_logout_post_handler_samecid(conn);
4546 break;
4547 }
4548 } else {
4549 switch (cmd->logout_response) {
4550 case ISCSI_LOGOUT_SUCCESS:
4551 iscsit_logout_post_handler_diffcid(conn,
4552 cmd->logout_cid);
4553 break;
4554 case ISCSI_LOGOUT_CID_NOT_FOUND:
4555 case ISCSI_LOGOUT_CLEANUP_FAILED:
4556 default:
4557 break;
4558 }
4559 ret = 1;
4560 }
4561 break;
4562 case ISCSI_LOGOUT_REASON_RECOVERY:
4563 switch (cmd->logout_response) {
4564 case ISCSI_LOGOUT_SUCCESS:
4565 case ISCSI_LOGOUT_CID_NOT_FOUND:
4566 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4567 case ISCSI_LOGOUT_CLEANUP_FAILED:
4568 default:
4569 break;
4570 }
4571 ret = 1;
4572 break;
4573 default:
4574 break;
4575
4576 }
4577 return ret;
4578 }
4579 EXPORT_SYMBOL(iscsit_logout_post_handler);
4580
iscsit_fail_session(struct iscsi_session * sess)4581 void iscsit_fail_session(struct iscsi_session *sess)
4582 {
4583 struct iscsi_conn *conn;
4584
4585 spin_lock_bh(&sess->conn_lock);
4586 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4587 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4588 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4589 }
4590 spin_unlock_bh(&sess->conn_lock);
4591
4592 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4593 sess->session_state = TARG_SESS_STATE_FAILED;
4594 }
4595
iscsit_stop_session(struct iscsi_session * sess,int session_sleep,int connection_sleep)4596 void iscsit_stop_session(
4597 struct iscsi_session *sess,
4598 int session_sleep,
4599 int connection_sleep)
4600 {
4601 u16 conn_count = atomic_read(&sess->nconn);
4602 struct iscsi_conn *conn, *conn_tmp = NULL;
4603 int is_last;
4604
4605 spin_lock_bh(&sess->conn_lock);
4606
4607 if (connection_sleep) {
4608 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4609 conn_list) {
4610 if (conn_count == 0)
4611 break;
4612
4613 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4614 is_last = 1;
4615 } else {
4616 iscsit_inc_conn_usage_count(conn_tmp);
4617 is_last = 0;
4618 }
4619 iscsit_inc_conn_usage_count(conn);
4620
4621 spin_unlock_bh(&sess->conn_lock);
4622 iscsit_cause_connection_reinstatement(conn, 1);
4623 spin_lock_bh(&sess->conn_lock);
4624
4625 iscsit_dec_conn_usage_count(conn);
4626 if (is_last == 0)
4627 iscsit_dec_conn_usage_count(conn_tmp);
4628 conn_count--;
4629 }
4630 } else {
4631 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4632 iscsit_cause_connection_reinstatement(conn, 0);
4633 }
4634
4635 if (session_sleep && atomic_read(&sess->nconn)) {
4636 spin_unlock_bh(&sess->conn_lock);
4637 wait_for_completion(&sess->session_wait_comp);
4638 } else
4639 spin_unlock_bh(&sess->conn_lock);
4640 }
4641
iscsit_release_sessions_for_tpg(struct iscsi_portal_group * tpg,int force)4642 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4643 {
4644 struct iscsi_session *sess;
4645 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4646 struct se_session *se_sess, *se_sess_tmp;
4647 LIST_HEAD(free_list);
4648 int session_count = 0;
4649
4650 spin_lock_bh(&se_tpg->session_lock);
4651 if (tpg->nsessions && !force) {
4652 spin_unlock_bh(&se_tpg->session_lock);
4653 return -1;
4654 }
4655
4656 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4657 sess_list) {
4658 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4659
4660 spin_lock(&sess->conn_lock);
4661 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4662 atomic_read(&sess->session_logout) ||
4663 atomic_read(&sess->session_close) ||
4664 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4665 spin_unlock(&sess->conn_lock);
4666 continue;
4667 }
4668 iscsit_inc_session_usage_count(sess);
4669 atomic_set(&sess->session_reinstatement, 1);
4670 atomic_set(&sess->session_fall_back_to_erl0, 1);
4671 atomic_set(&sess->session_close, 1);
4672 spin_unlock(&sess->conn_lock);
4673
4674 list_move_tail(&se_sess->sess_list, &free_list);
4675 }
4676 spin_unlock_bh(&se_tpg->session_lock);
4677
4678 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4679 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4680
4681 list_del_init(&se_sess->sess_list);
4682 iscsit_stop_session(sess, 1, 1);
4683 iscsit_dec_session_usage_count(sess);
4684 session_count++;
4685 }
4686
4687 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4688 " Group: %hu\n", session_count, tpg->tpgt);
4689 return 0;
4690 }
4691
4692 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4693 MODULE_VERSION("4.1.x");
4694 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4695 MODULE_LICENSE("GPL");
4696
4697 module_init(iscsi_target_init_module);
4698 module_exit(iscsi_target_cleanup_module);
4699
