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 iscsit_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 iscsit_conn *);
476
iscsit_queue_rsp(struct iscsit_conn * conn,struct iscsit_cmd * cmd)477 int iscsit_queue_rsp(struct iscsit_conn *conn, struct iscsit_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 iscsit_conn * conn,struct iscsit_cmd * cmd)483 void iscsit_aborted_task(struct iscsit_conn *conn, struct iscsit_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 iscsit_conn *);
497
498 static int
iscsit_xmit_nondatain_pdu(struct iscsit_conn * conn,struct iscsit_cmd * cmd,const void * data_buf,u32 data_buf_len)499 iscsit_xmit_nondatain_pdu(struct iscsit_conn *conn, struct iscsit_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 iscsit_cmd *cmd, struct kvec *iov, int nvec,
568 u32 data_offset, u32 data_length);
569 static void iscsit_unmap_iovec(struct iscsit_cmd *);
570 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsit_cmd *,
571 u32, u32, u32, u8 *);
572 static int
iscsit_xmit_datain_pdu(struct iscsit_conn * conn,struct iscsit_cmd * cmd,const struct iscsi_datain * datain)573 iscsit_xmit_datain_pdu(struct iscsit_conn *conn, struct iscsit_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 iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_datain_req * dr,const void * buf,u32 buf_len)647 static int iscsit_xmit_pdu(struct iscsit_conn *conn, struct iscsit_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 iscsit_conn * conn)657 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsit_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 if (!zalloc_cpumask_var(&iscsit_global->allowed_cpumask, GFP_KERNEL)) {
706 pr_err("Unable to allocate iscsit_global->allowed_cpumask\n");
707 goto bitmap_out;
708 }
709 cpumask_setall(iscsit_global->allowed_cpumask);
710
711 lio_qr_cache = kmem_cache_create("lio_qr_cache",
712 sizeof(struct iscsi_queue_req),
713 __alignof__(struct iscsi_queue_req), 0, NULL);
714 if (!lio_qr_cache) {
715 pr_err("Unable to kmem_cache_create() for"
716 " lio_qr_cache\n");
717 goto cpumask_out;
718 }
719
720 lio_dr_cache = kmem_cache_create("lio_dr_cache",
721 sizeof(struct iscsi_datain_req),
722 __alignof__(struct iscsi_datain_req), 0, NULL);
723 if (!lio_dr_cache) {
724 pr_err("Unable to kmem_cache_create() for"
725 " lio_dr_cache\n");
726 goto qr_out;
727 }
728
729 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
730 sizeof(struct iscsi_ooo_cmdsn),
731 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
732 if (!lio_ooo_cache) {
733 pr_err("Unable to kmem_cache_create() for"
734 " lio_ooo_cache\n");
735 goto dr_out;
736 }
737
738 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
739 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
740 0, NULL);
741 if (!lio_r2t_cache) {
742 pr_err("Unable to kmem_cache_create() for"
743 " lio_r2t_cache\n");
744 goto ooo_out;
745 }
746
747 iscsit_register_transport(&iscsi_target_transport);
748
749 if (iscsit_load_discovery_tpg() < 0)
750 goto r2t_out;
751
752 return ret;
753 r2t_out:
754 iscsit_unregister_transport(&iscsi_target_transport);
755 kmem_cache_destroy(lio_r2t_cache);
756 ooo_out:
757 kmem_cache_destroy(lio_ooo_cache);
758 dr_out:
759 kmem_cache_destroy(lio_dr_cache);
760 qr_out:
761 kmem_cache_destroy(lio_qr_cache);
762 cpumask_out:
763 free_cpumask_var(iscsit_global->allowed_cpumask);
764 bitmap_out:
765 vfree(iscsit_global->ts_bitmap);
766 configfs_out:
767 /* XXX: this probably wants it to be it's own unwind step.. */
768 if (iscsit_global->discovery_tpg)
769 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
770 target_unregister_template(&iscsi_ops);
771 out:
772 kfree(iscsit_global);
773 return -ENOMEM;
774 }
775
iscsi_target_cleanup_module(void)776 static void __exit iscsi_target_cleanup_module(void)
777 {
778 iscsit_release_discovery_tpg();
779 iscsit_unregister_transport(&iscsi_target_transport);
780 kmem_cache_destroy(lio_qr_cache);
781 kmem_cache_destroy(lio_dr_cache);
782 kmem_cache_destroy(lio_ooo_cache);
783 kmem_cache_destroy(lio_r2t_cache);
784
785 /*
786 * Shutdown discovery sessions and disable discovery TPG
787 */
788 if (iscsit_global->discovery_tpg)
789 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
790
791 target_unregister_template(&iscsi_ops);
792
793 free_cpumask_var(iscsit_global->allowed_cpumask);
794 vfree(iscsit_global->ts_bitmap);
795 kfree(iscsit_global);
796 }
797
iscsit_add_reject(struct iscsit_conn * conn,u8 reason,unsigned char * buf)798 int iscsit_add_reject(
799 struct iscsit_conn *conn,
800 u8 reason,
801 unsigned char *buf)
802 {
803 struct iscsit_cmd *cmd;
804
805 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
806 if (!cmd)
807 return -1;
808
809 cmd->iscsi_opcode = ISCSI_OP_REJECT;
810 cmd->reject_reason = reason;
811
812 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
813 if (!cmd->buf_ptr) {
814 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
815 iscsit_free_cmd(cmd, false);
816 return -1;
817 }
818
819 spin_lock_bh(&conn->cmd_lock);
820 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
821 spin_unlock_bh(&conn->cmd_lock);
822
823 cmd->i_state = ISTATE_SEND_REJECT;
824 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
825
826 return -1;
827 }
828 EXPORT_SYMBOL(iscsit_add_reject);
829
iscsit_add_reject_from_cmd(struct iscsit_cmd * cmd,u8 reason,bool add_to_conn,unsigned char * buf)830 static int iscsit_add_reject_from_cmd(
831 struct iscsit_cmd *cmd,
832 u8 reason,
833 bool add_to_conn,
834 unsigned char *buf)
835 {
836 struct iscsit_conn *conn;
837 const bool do_put = cmd->se_cmd.se_tfo != NULL;
838
839 if (!cmd->conn) {
840 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
841 cmd->init_task_tag);
842 return -1;
843 }
844 conn = cmd->conn;
845
846 cmd->iscsi_opcode = ISCSI_OP_REJECT;
847 cmd->reject_reason = reason;
848
849 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
850 if (!cmd->buf_ptr) {
851 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
852 iscsit_free_cmd(cmd, false);
853 return -1;
854 }
855
856 if (add_to_conn) {
857 spin_lock_bh(&conn->cmd_lock);
858 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
859 spin_unlock_bh(&conn->cmd_lock);
860 }
861
862 cmd->i_state = ISTATE_SEND_REJECT;
863 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
864 /*
865 * Perform the kref_put now if se_cmd has already been setup by
866 * scsit_setup_scsi_cmd()
867 */
868 if (do_put) {
869 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
870 target_put_sess_cmd(&cmd->se_cmd);
871 }
872 return -1;
873 }
874
iscsit_add_reject_cmd(struct iscsit_cmd * cmd,u8 reason,unsigned char * buf)875 static int iscsit_add_reject_cmd(struct iscsit_cmd *cmd, u8 reason,
876 unsigned char *buf)
877 {
878 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
879 }
880
iscsit_reject_cmd(struct iscsit_cmd * cmd,u8 reason,unsigned char * buf)881 int iscsit_reject_cmd(struct iscsit_cmd *cmd, u8 reason, unsigned char *buf)
882 {
883 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
884 }
885 EXPORT_SYMBOL(iscsit_reject_cmd);
886
887 /*
888 * Map some portion of the allocated scatterlist to an iovec, suitable for
889 * kernel sockets to copy data in/out.
890 */
iscsit_map_iovec(struct iscsit_cmd * cmd,struct kvec * iov,int nvec,u32 data_offset,u32 data_length)891 static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec,
892 u32 data_offset, u32 data_length)
893 {
894 u32 i = 0, orig_data_length = data_length;
895 struct scatterlist *sg;
896 unsigned int page_off;
897
898 /*
899 * We know each entry in t_data_sg contains a page.
900 */
901 u32 ent = data_offset / PAGE_SIZE;
902
903 if (!data_length)
904 return 0;
905
906 if (ent >= cmd->se_cmd.t_data_nents) {
907 pr_err("Initial page entry out-of-bounds\n");
908 goto overflow;
909 }
910
911 sg = &cmd->se_cmd.t_data_sg[ent];
912 page_off = (data_offset % PAGE_SIZE);
913
914 cmd->first_data_sg = sg;
915 cmd->first_data_sg_off = page_off;
916
917 while (data_length) {
918 u32 cur_len;
919
920 if (WARN_ON_ONCE(!sg || i >= nvec))
921 goto overflow;
922
923 cur_len = min_t(u32, data_length, sg->length - page_off);
924
925 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
926 iov[i].iov_len = cur_len;
927
928 data_length -= cur_len;
929 page_off = 0;
930 sg = sg_next(sg);
931 i++;
932 }
933
934 cmd->kmapped_nents = i;
935
936 return i;
937
938 overflow:
939 pr_err("offset %d + length %d overflow; %d/%d; sg-list:\n",
940 data_offset, orig_data_length, i, nvec);
941 for_each_sg(cmd->se_cmd.t_data_sg, sg,
942 cmd->se_cmd.t_data_nents, i) {
943 pr_err("[%d] off %d len %d\n",
944 i, sg->offset, sg->length);
945 }
946 return -1;
947 }
948
iscsit_unmap_iovec(struct iscsit_cmd * cmd)949 static void iscsit_unmap_iovec(struct iscsit_cmd *cmd)
950 {
951 u32 i;
952 struct scatterlist *sg;
953
954 sg = cmd->first_data_sg;
955
956 for (i = 0; i < cmd->kmapped_nents; i++)
957 kunmap(sg_page(&sg[i]));
958 }
959
iscsit_ack_from_expstatsn(struct iscsit_conn * conn,u32 exp_statsn)960 static void iscsit_ack_from_expstatsn(struct iscsit_conn *conn, u32 exp_statsn)
961 {
962 LIST_HEAD(ack_list);
963 struct iscsit_cmd *cmd, *cmd_p;
964
965 conn->exp_statsn = exp_statsn;
966
967 if (conn->sess->sess_ops->RDMAExtensions)
968 return;
969
970 spin_lock_bh(&conn->cmd_lock);
971 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
972 spin_lock(&cmd->istate_lock);
973 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
974 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
975 cmd->i_state = ISTATE_REMOVE;
976 spin_unlock(&cmd->istate_lock);
977 list_move_tail(&cmd->i_conn_node, &ack_list);
978 continue;
979 }
980 spin_unlock(&cmd->istate_lock);
981 }
982 spin_unlock_bh(&conn->cmd_lock);
983
984 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
985 list_del_init(&cmd->i_conn_node);
986 iscsit_free_cmd(cmd, false);
987 }
988 }
989
iscsit_allocate_iovecs(struct iscsit_cmd * cmd)990 static int iscsit_allocate_iovecs(struct iscsit_cmd *cmd)
991 {
992 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
993
994 iov_count += ISCSI_IOV_DATA_BUFFER;
995 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
996 if (!cmd->iov_data)
997 return -ENOMEM;
998
999 cmd->orig_iov_data_count = iov_count;
1000 return 0;
1001 }
1002
iscsit_setup_scsi_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)1003 int iscsit_setup_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1004 unsigned char *buf)
1005 {
1006 int data_direction, payload_length;
1007 struct iscsi_scsi_req *hdr;
1008 int iscsi_task_attr;
1009 int sam_task_attr;
1010
1011 atomic_long_inc(&conn->sess->cmd_pdus);
1012
1013 hdr = (struct iscsi_scsi_req *) buf;
1014 payload_length = ntoh24(hdr->dlength);
1015
1016 /* FIXME; Add checks for AdditionalHeaderSegment */
1017
1018 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1019 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1020 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1021 " not set. Bad iSCSI Initiator.\n");
1022 return iscsit_add_reject_cmd(cmd,
1023 ISCSI_REASON_BOOKMARK_INVALID, buf);
1024 }
1025
1026 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1027 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1028 /*
1029 * From RFC-3720 Section 10.3.1:
1030 *
1031 * "Either or both of R and W MAY be 1 when either the
1032 * Expected Data Transfer Length and/or Bidirectional Read
1033 * Expected Data Transfer Length are 0"
1034 *
1035 * For this case, go ahead and clear the unnecssary bits
1036 * to avoid any confusion with ->data_direction.
1037 */
1038 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1039 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1040
1041 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1042 " set when Expected Data Transfer Length is 0 for"
1043 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1044 }
1045
1046 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1047 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1048 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1049 " MUST be set if Expected Data Transfer Length is not 0."
1050 " Bad iSCSI Initiator\n");
1051 return iscsit_add_reject_cmd(cmd,
1052 ISCSI_REASON_BOOKMARK_INVALID, buf);
1053 }
1054
1055 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1056 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1057 pr_err("Bidirectional operations not supported!\n");
1058 return iscsit_add_reject_cmd(cmd,
1059 ISCSI_REASON_BOOKMARK_INVALID, buf);
1060 }
1061
1062 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1063 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1064 " Scsi Command PDU.\n");
1065 return iscsit_add_reject_cmd(cmd,
1066 ISCSI_REASON_BOOKMARK_INVALID, buf);
1067 }
1068
1069 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1070 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1071 " protocol error.\n", payload_length);
1072 return iscsit_add_reject_cmd(cmd,
1073 ISCSI_REASON_PROTOCOL_ERROR, buf);
1074 }
1075
1076 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1077 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1078 pr_err("Expected Data Transfer Length and Length of"
1079 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1080 " bit is not set protocol error\n");
1081 return iscsit_add_reject_cmd(cmd,
1082 ISCSI_REASON_PROTOCOL_ERROR, buf);
1083 }
1084
1085 if (payload_length > be32_to_cpu(hdr->data_length)) {
1086 pr_err("DataSegmentLength: %u is greater than"
1087 " EDTL: %u, protocol error.\n", payload_length,
1088 hdr->data_length);
1089 return iscsit_add_reject_cmd(cmd,
1090 ISCSI_REASON_PROTOCOL_ERROR, buf);
1091 }
1092
1093 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1094 pr_err("DataSegmentLength: %u is greater than"
1095 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1096 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1097 return iscsit_add_reject_cmd(cmd,
1098 ISCSI_REASON_PROTOCOL_ERROR, buf);
1099 }
1100
1101 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1102 pr_err("DataSegmentLength: %u is greater than"
1103 " FirstBurstLength: %u, protocol error.\n",
1104 payload_length, conn->sess->sess_ops->FirstBurstLength);
1105 return iscsit_add_reject_cmd(cmd,
1106 ISCSI_REASON_BOOKMARK_INVALID, buf);
1107 }
1108
1109 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1110 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1111 DMA_NONE;
1112
1113 cmd->data_direction = data_direction;
1114 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1115 /*
1116 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1117 */
1118 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1119 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1120 sam_task_attr = TCM_SIMPLE_TAG;
1121 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1122 sam_task_attr = TCM_ORDERED_TAG;
1123 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1124 sam_task_attr = TCM_HEAD_TAG;
1125 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1126 sam_task_attr = TCM_ACA_TAG;
1127 else {
1128 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1129 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1130 sam_task_attr = TCM_SIMPLE_TAG;
1131 }
1132
1133 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1134 cmd->i_state = ISTATE_NEW_CMD;
1135 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1136 cmd->immediate_data = (payload_length) ? 1 : 0;
1137 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1138 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1139 if (cmd->unsolicited_data)
1140 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1141
1142 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1143 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1144 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1145 else
1146 cmd->targ_xfer_tag = 0xFFFFFFFF;
1147 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1148 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1149 cmd->first_burst_len = payload_length;
1150
1151 if (!conn->sess->sess_ops->RDMAExtensions &&
1152 cmd->data_direction == DMA_FROM_DEVICE) {
1153 struct iscsi_datain_req *dr;
1154
1155 dr = iscsit_allocate_datain_req();
1156 if (!dr)
1157 return iscsit_add_reject_cmd(cmd,
1158 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1159
1160 iscsit_attach_datain_req(cmd, dr);
1161 }
1162
1163 /*
1164 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1165 */
1166 __target_init_cmd(&cmd->se_cmd, &iscsi_ops,
1167 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1168 cmd->data_direction, sam_task_attr,
1169 cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun));
1170
1171 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1172 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1173 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1174 conn->cid);
1175
1176 target_get_sess_cmd(&cmd->se_cmd, true);
1177
1178 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1179 cmd->sense_reason = target_cmd_init_cdb(&cmd->se_cmd, hdr->cdb,
1180 GFP_KERNEL);
1181
1182 if (cmd->sense_reason) {
1183 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1184 return iscsit_add_reject_cmd(cmd,
1185 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1186 }
1187
1188 goto attach_cmd;
1189 }
1190
1191 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd);
1192 if (cmd->sense_reason)
1193 goto attach_cmd;
1194
1195 cmd->sense_reason = target_cmd_parse_cdb(&cmd->se_cmd);
1196 if (cmd->sense_reason)
1197 goto attach_cmd;
1198
1199 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1200 return iscsit_add_reject_cmd(cmd,
1201 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1202 }
1203
1204 attach_cmd:
1205 spin_lock_bh(&conn->cmd_lock);
1206 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1207 spin_unlock_bh(&conn->cmd_lock);
1208 /*
1209 * Check if we need to delay processing because of ALUA
1210 * Active/NonOptimized primary access state..
1211 */
1212 core_alua_check_nonop_delay(&cmd->se_cmd);
1213
1214 return 0;
1215 }
1216 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1217
iscsit_set_unsolicited_dataout(struct iscsit_cmd * cmd)1218 void iscsit_set_unsolicited_dataout(struct iscsit_cmd *cmd)
1219 {
1220 iscsit_set_dataout_sequence_values(cmd);
1221
1222 spin_lock_bh(&cmd->dataout_timeout_lock);
1223 iscsit_start_dataout_timer(cmd, cmd->conn);
1224 spin_unlock_bh(&cmd->dataout_timeout_lock);
1225 }
1226 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout);
1227
iscsit_process_scsi_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_scsi_req * hdr)1228 int iscsit_process_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1229 struct iscsi_scsi_req *hdr)
1230 {
1231 int cmdsn_ret = 0;
1232 /*
1233 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1234 * the Immediate Bit is not set, and no Immediate
1235 * Data is attached.
1236 *
1237 * A PDU/CmdSN carrying Immediate Data can only
1238 * be processed after the DataCRC has passed.
1239 * If the DataCRC fails, the CmdSN MUST NOT
1240 * be acknowledged. (See below)
1241 */
1242 if (!cmd->immediate_data) {
1243 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1244 (unsigned char *)hdr, hdr->cmdsn);
1245 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1246 return -1;
1247 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1248 target_put_sess_cmd(&cmd->se_cmd);
1249 return 0;
1250 }
1251 }
1252
1253 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1254
1255 /*
1256 * If no Immediate Data is attached, it's OK to return now.
1257 */
1258 if (!cmd->immediate_data) {
1259 if (!cmd->sense_reason && cmd->unsolicited_data)
1260 iscsit_set_unsolicited_dataout(cmd);
1261 if (!cmd->sense_reason)
1262 return 0;
1263
1264 target_put_sess_cmd(&cmd->se_cmd);
1265 return 0;
1266 }
1267
1268 /*
1269 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1270 * execution. These exceptions are processed in CmdSN order using
1271 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1272 */
1273 if (cmd->sense_reason)
1274 return 1;
1275 /*
1276 * Call directly into transport_generic_new_cmd() to perform
1277 * the backend memory allocation.
1278 */
1279 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1280 if (cmd->sense_reason)
1281 return 1;
1282
1283 return 0;
1284 }
1285 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1286
1287 static int
iscsit_get_immediate_data(struct iscsit_cmd * cmd,struct iscsi_scsi_req * hdr,bool dump_payload)1288 iscsit_get_immediate_data(struct iscsit_cmd *cmd, struct iscsi_scsi_req *hdr,
1289 bool dump_payload)
1290 {
1291 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1292 int rc;
1293
1294 /*
1295 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1296 */
1297 if (dump_payload) {
1298 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done,
1299 cmd->first_burst_len);
1300
1301 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n",
1302 cmd->se_cmd.data_length, cmd->write_data_done,
1303 cmd->first_burst_len, length);
1304 rc = iscsit_dump_data_payload(cmd->conn, length, 1);
1305 pr_debug("Finished dumping immediate data\n");
1306 if (rc < 0)
1307 immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER;
1308 } else {
1309 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1310 cmd->first_burst_len);
1311 }
1312
1313 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1314 /*
1315 * A PDU/CmdSN carrying Immediate Data passed
1316 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1317 * Immediate Bit is not set.
1318 */
1319 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1320 (unsigned char *)hdr, hdr->cmdsn);
1321 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1322 return -1;
1323
1324 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1325 target_put_sess_cmd(&cmd->se_cmd);
1326
1327 return 0;
1328 } else if (cmd->unsolicited_data)
1329 iscsit_set_unsolicited_dataout(cmd);
1330
1331 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1332 /*
1333 * Immediate Data failed DataCRC and ERL>=1,
1334 * silently drop this PDU and let the initiator
1335 * plug the CmdSN gap.
1336 *
1337 * FIXME: Send Unsolicited NOPIN with reserved
1338 * TTT here to help the initiator figure out
1339 * the missing CmdSN, although they should be
1340 * intelligent enough to determine the missing
1341 * CmdSN and issue a retry to plug the sequence.
1342 */
1343 cmd->i_state = ISTATE_REMOVE;
1344 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1345 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1346 return -1;
1347
1348 return 0;
1349 }
1350
1351 static int
iscsit_handle_scsi_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)1352 iscsit_handle_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1353 unsigned char *buf)
1354 {
1355 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1356 int rc, immed_data;
1357 bool dump_payload = false;
1358
1359 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1360 if (rc < 0)
1361 return 0;
1362 /*
1363 * Allocation iovecs needed for struct socket operations for
1364 * traditional iSCSI block I/O.
1365 */
1366 if (iscsit_allocate_iovecs(cmd) < 0) {
1367 return iscsit_reject_cmd(cmd,
1368 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1369 }
1370 immed_data = cmd->immediate_data;
1371
1372 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1373 if (rc < 0)
1374 return rc;
1375 else if (rc > 0)
1376 dump_payload = true;
1377
1378 if (!immed_data)
1379 return 0;
1380
1381 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1382 }
1383
iscsit_do_crypto_hash_sg(struct ahash_request * hash,struct iscsit_cmd * cmd,u32 data_offset,u32 data_length,u32 padding,u8 * pad_bytes)1384 static u32 iscsit_do_crypto_hash_sg(
1385 struct ahash_request *hash,
1386 struct iscsit_cmd *cmd,
1387 u32 data_offset,
1388 u32 data_length,
1389 u32 padding,
1390 u8 *pad_bytes)
1391 {
1392 u32 data_crc;
1393 struct scatterlist *sg;
1394 unsigned int page_off;
1395
1396 crypto_ahash_init(hash);
1397
1398 sg = cmd->first_data_sg;
1399 page_off = cmd->first_data_sg_off;
1400
1401 if (data_length && page_off) {
1402 struct scatterlist first_sg;
1403 u32 len = min_t(u32, data_length, sg->length - page_off);
1404
1405 sg_init_table(&first_sg, 1);
1406 sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off);
1407
1408 ahash_request_set_crypt(hash, &first_sg, NULL, len);
1409 crypto_ahash_update(hash);
1410
1411 data_length -= len;
1412 sg = sg_next(sg);
1413 }
1414
1415 while (data_length) {
1416 u32 cur_len = min_t(u32, data_length, sg->length);
1417
1418 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1419 crypto_ahash_update(hash);
1420
1421 data_length -= cur_len;
1422 /* iscsit_map_iovec has already checked for invalid sg pointers */
1423 sg = sg_next(sg);
1424 }
1425
1426 if (padding) {
1427 struct scatterlist pad_sg;
1428
1429 sg_init_one(&pad_sg, pad_bytes, padding);
1430 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1431 padding);
1432 crypto_ahash_finup(hash);
1433 } else {
1434 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1435 crypto_ahash_final(hash);
1436 }
1437
1438 return data_crc;
1439 }
1440
iscsit_do_crypto_hash_buf(struct ahash_request * hash,const void * buf,u32 payload_length,u32 padding,const void * pad_bytes,void * data_crc)1441 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1442 const void *buf, u32 payload_length, u32 padding,
1443 const void *pad_bytes, void *data_crc)
1444 {
1445 struct scatterlist sg[2];
1446
1447 sg_init_table(sg, ARRAY_SIZE(sg));
1448 sg_set_buf(sg, buf, payload_length);
1449 if (padding)
1450 sg_set_buf(sg + 1, pad_bytes, padding);
1451
1452 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1453
1454 crypto_ahash_digest(hash);
1455 }
1456
1457 int
__iscsit_check_dataout_hdr(struct iscsit_conn * conn,void * buf,struct iscsit_cmd * cmd,u32 payload_length,bool * success)1458 __iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf,
1459 struct iscsit_cmd *cmd, u32 payload_length,
1460 bool *success)
1461 {
1462 struct iscsi_data *hdr = buf;
1463 struct se_cmd *se_cmd;
1464 int rc;
1465
1466 /* iSCSI write */
1467 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1468
1469 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1470 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1471 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1472 payload_length, conn->cid);
1473
1474 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1475 pr_err("Command ITT: 0x%08x received DataOUT after"
1476 " last DataOUT received, dumping payload\n",
1477 cmd->init_task_tag);
1478 return iscsit_dump_data_payload(conn, payload_length, 1);
1479 }
1480
1481 if (cmd->data_direction != DMA_TO_DEVICE) {
1482 pr_err("Command ITT: 0x%08x received DataOUT for a"
1483 " NON-WRITE command.\n", cmd->init_task_tag);
1484 return iscsit_dump_data_payload(conn, payload_length, 1);
1485 }
1486 se_cmd = &cmd->se_cmd;
1487 iscsit_mod_dataout_timer(cmd);
1488
1489 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1490 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1491 be32_to_cpu(hdr->offset), payload_length,
1492 cmd->se_cmd.data_length);
1493 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1494 }
1495
1496 if (cmd->unsolicited_data) {
1497 int dump_unsolicited_data = 0;
1498
1499 if (conn->sess->sess_ops->InitialR2T) {
1500 pr_err("Received unexpected unsolicited data"
1501 " while InitialR2T=Yes, protocol error.\n");
1502 transport_send_check_condition_and_sense(&cmd->se_cmd,
1503 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1504 return -1;
1505 }
1506 /*
1507 * Special case for dealing with Unsolicited DataOUT
1508 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1509 * failures;
1510 */
1511
1512 /* Something's amiss if we're not in WRITE_PENDING state... */
1513 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1514 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1515 dump_unsolicited_data = 1;
1516
1517 if (dump_unsolicited_data) {
1518 /*
1519 * Check if a delayed TASK_ABORTED status needs to
1520 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1521 * received with the unsolicited data out.
1522 */
1523 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1524 iscsit_stop_dataout_timer(cmd);
1525
1526 return iscsit_dump_data_payload(conn, payload_length, 1);
1527 }
1528 } else {
1529 /*
1530 * For the normal solicited data path:
1531 *
1532 * Check for a delayed TASK_ABORTED status and dump any
1533 * incoming data out payload if one exists. Also, when the
1534 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1535 * data out sequence, we decrement outstanding_r2ts. Once
1536 * outstanding_r2ts reaches zero, go ahead and send the delayed
1537 * TASK_ABORTED status.
1538 */
1539 if (se_cmd->transport_state & CMD_T_ABORTED) {
1540 if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1541 --cmd->outstanding_r2ts < 1)
1542 iscsit_stop_dataout_timer(cmd);
1543
1544 return iscsit_dump_data_payload(conn, payload_length, 1);
1545 }
1546 }
1547 /*
1548 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1549 * within-command recovery checks before receiving the payload.
1550 */
1551 rc = iscsit_check_pre_dataout(cmd, buf);
1552 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1553 return 0;
1554 else if (rc == DATAOUT_CANNOT_RECOVER)
1555 return -1;
1556 *success = true;
1557 return 0;
1558 }
1559 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1560
1561 int
iscsit_check_dataout_hdr(struct iscsit_conn * conn,void * buf,struct iscsit_cmd ** out_cmd)1562 iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf,
1563 struct iscsit_cmd **out_cmd)
1564 {
1565 struct iscsi_data *hdr = buf;
1566 struct iscsit_cmd *cmd;
1567 u32 payload_length = ntoh24(hdr->dlength);
1568 int rc;
1569 bool success = false;
1570
1571 if (!payload_length) {
1572 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1573 return 0;
1574 }
1575
1576 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1577 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1578 " MaxXmitDataSegmentLength: %u\n", payload_length,
1579 conn->conn_ops->MaxXmitDataSegmentLength);
1580 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1581 }
1582
1583 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1584 if (!cmd)
1585 return 0;
1586
1587 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1588
1589 if (success)
1590 *out_cmd = cmd;
1591
1592 return rc;
1593 }
1594 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1595
1596 static int
iscsit_get_dataout(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_data * hdr)1597 iscsit_get_dataout(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1598 struct iscsi_data *hdr)
1599 {
1600 struct kvec *iov;
1601 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1602 u32 payload_length;
1603 int iov_ret, data_crc_failed = 0;
1604
1605 payload_length = min_t(u32, cmd->se_cmd.data_length,
1606 ntoh24(hdr->dlength));
1607 rx_size += payload_length;
1608 iov = &cmd->iov_data[0];
1609
1610 iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2,
1611 be32_to_cpu(hdr->offset), payload_length);
1612 if (iov_ret < 0)
1613 return -1;
1614
1615 iov_count += iov_ret;
1616
1617 padding = ((-payload_length) & 3);
1618 if (padding != 0) {
1619 iov[iov_count].iov_base = cmd->pad_bytes;
1620 iov[iov_count++].iov_len = padding;
1621 rx_size += padding;
1622 pr_debug("Receiving %u padding bytes.\n", padding);
1623 }
1624
1625 if (conn->conn_ops->DataDigest) {
1626 iov[iov_count].iov_base = &checksum;
1627 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1628 rx_size += ISCSI_CRC_LEN;
1629 }
1630
1631 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
1632 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1633
1634 iscsit_unmap_iovec(cmd);
1635
1636 if (rx_got != rx_size)
1637 return -1;
1638
1639 if (conn->conn_ops->DataDigest) {
1640 u32 data_crc;
1641
1642 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1643 be32_to_cpu(hdr->offset),
1644 payload_length, padding,
1645 cmd->pad_bytes);
1646
1647 if (checksum != data_crc) {
1648 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1649 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1650 " does not match computed 0x%08x\n",
1651 hdr->itt, hdr->offset, payload_length,
1652 hdr->datasn, checksum, data_crc);
1653 data_crc_failed = 1;
1654 } else {
1655 pr_debug("Got CRC32C DataDigest 0x%08x for"
1656 " %u bytes of Data Out\n", checksum,
1657 payload_length);
1658 }
1659 }
1660
1661 return data_crc_failed;
1662 }
1663
1664 int
iscsit_check_dataout_payload(struct iscsit_cmd * cmd,struct iscsi_data * hdr,bool data_crc_failed)1665 iscsit_check_dataout_payload(struct iscsit_cmd *cmd, struct iscsi_data *hdr,
1666 bool data_crc_failed)
1667 {
1668 struct iscsit_conn *conn = cmd->conn;
1669 int rc, ooo_cmdsn;
1670 /*
1671 * Increment post receive data and CRC values or perform
1672 * within-command recovery.
1673 */
1674 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1675 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1676 return 0;
1677 else if (rc == DATAOUT_SEND_R2T) {
1678 iscsit_set_dataout_sequence_values(cmd);
1679 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1680 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1681 /*
1682 * Handle extra special case for out of order
1683 * Unsolicited Data Out.
1684 */
1685 spin_lock_bh(&cmd->istate_lock);
1686 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1687 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1688 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1689 spin_unlock_bh(&cmd->istate_lock);
1690
1691 iscsit_stop_dataout_timer(cmd);
1692 if (ooo_cmdsn)
1693 return 0;
1694 target_execute_cmd(&cmd->se_cmd);
1695 return 0;
1696 } else /* DATAOUT_CANNOT_RECOVER */
1697 return -1;
1698
1699 return 0;
1700 }
1701 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1702
iscsit_handle_data_out(struct iscsit_conn * conn,unsigned char * buf)1703 static int iscsit_handle_data_out(struct iscsit_conn *conn, unsigned char *buf)
1704 {
1705 struct iscsit_cmd *cmd = NULL;
1706 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1707 int rc;
1708 bool data_crc_failed = false;
1709
1710 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1711 if (rc < 0)
1712 return 0;
1713 else if (!cmd)
1714 return 0;
1715
1716 rc = iscsit_get_dataout(conn, cmd, hdr);
1717 if (rc < 0)
1718 return rc;
1719 else if (rc > 0)
1720 data_crc_failed = true;
1721
1722 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1723 }
1724
iscsit_setup_nop_out(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_nopout * hdr)1725 int iscsit_setup_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1726 struct iscsi_nopout *hdr)
1727 {
1728 u32 payload_length = ntoh24(hdr->dlength);
1729
1730 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1731 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1732 if (!cmd)
1733 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1734 (unsigned char *)hdr);
1735
1736 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1737 (unsigned char *)hdr);
1738 }
1739
1740 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1741 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1742 " not set, protocol error.\n");
1743 if (!cmd)
1744 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1745 (unsigned char *)hdr);
1746
1747 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1748 (unsigned char *)hdr);
1749 }
1750
1751 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1752 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1753 " greater than MaxXmitDataSegmentLength: %u, protocol"
1754 " error.\n", payload_length,
1755 conn->conn_ops->MaxXmitDataSegmentLength);
1756 if (!cmd)
1757 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1758 (unsigned char *)hdr);
1759
1760 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1761 (unsigned char *)hdr);
1762 }
1763
1764 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1765 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1766 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1767 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1768 payload_length);
1769 /*
1770 * This is not a response to a Unsolicited NopIN, which means
1771 * it can either be a NOPOUT ping request (with a valid ITT),
1772 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1773 * Either way, make sure we allocate an struct iscsit_cmd, as both
1774 * can contain ping data.
1775 */
1776 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1777 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1778 cmd->i_state = ISTATE_SEND_NOPIN;
1779 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1780 1 : 0);
1781 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1782 cmd->targ_xfer_tag = 0xFFFFFFFF;
1783 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1784 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1785 cmd->data_direction = DMA_NONE;
1786 }
1787
1788 return 0;
1789 }
1790 EXPORT_SYMBOL(iscsit_setup_nop_out);
1791
iscsit_process_nop_out(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_nopout * hdr)1792 int iscsit_process_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1793 struct iscsi_nopout *hdr)
1794 {
1795 struct iscsit_cmd *cmd_p = NULL;
1796 int cmdsn_ret = 0;
1797 /*
1798 * Initiator is expecting a NopIN ping reply..
1799 */
1800 if (hdr->itt != RESERVED_ITT) {
1801 if (!cmd)
1802 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1803 (unsigned char *)hdr);
1804
1805 spin_lock_bh(&conn->cmd_lock);
1806 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1807 spin_unlock_bh(&conn->cmd_lock);
1808
1809 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1810
1811 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1812 iscsit_add_cmd_to_response_queue(cmd, conn,
1813 cmd->i_state);
1814 return 0;
1815 }
1816
1817 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1818 (unsigned char *)hdr, hdr->cmdsn);
1819 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1820 return 0;
1821 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1822 return -1;
1823
1824 return 0;
1825 }
1826 /*
1827 * This was a response to a unsolicited NOPIN ping.
1828 */
1829 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1830 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1831 if (!cmd_p)
1832 return -EINVAL;
1833
1834 iscsit_stop_nopin_response_timer(conn);
1835
1836 cmd_p->i_state = ISTATE_REMOVE;
1837 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1838
1839 iscsit_start_nopin_timer(conn);
1840 return 0;
1841 }
1842 /*
1843 * Otherwise, initiator is not expecting a NOPIN is response.
1844 * Just ignore for now.
1845 */
1846
1847 if (cmd)
1848 iscsit_free_cmd(cmd, false);
1849
1850 return 0;
1851 }
1852 EXPORT_SYMBOL(iscsit_process_nop_out);
1853
iscsit_handle_nop_out(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)1854 static int iscsit_handle_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1855 unsigned char *buf)
1856 {
1857 unsigned char *ping_data = NULL;
1858 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1859 struct kvec *iov = NULL;
1860 u32 payload_length = ntoh24(hdr->dlength);
1861 int ret;
1862
1863 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1864 if (ret < 0)
1865 return 0;
1866 /*
1867 * Handle NOP-OUT payload for traditional iSCSI sockets
1868 */
1869 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1870 u32 checksum, data_crc, padding = 0;
1871 int niov = 0, rx_got, rx_size = payload_length;
1872
1873 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1874 if (!ping_data) {
1875 ret = -1;
1876 goto out;
1877 }
1878
1879 iov = &cmd->iov_misc[0];
1880 iov[niov].iov_base = ping_data;
1881 iov[niov++].iov_len = payload_length;
1882
1883 padding = ((-payload_length) & 3);
1884 if (padding != 0) {
1885 pr_debug("Receiving %u additional bytes"
1886 " for padding.\n", padding);
1887 iov[niov].iov_base = &cmd->pad_bytes;
1888 iov[niov++].iov_len = padding;
1889 rx_size += padding;
1890 }
1891 if (conn->conn_ops->DataDigest) {
1892 iov[niov].iov_base = &checksum;
1893 iov[niov++].iov_len = ISCSI_CRC_LEN;
1894 rx_size += ISCSI_CRC_LEN;
1895 }
1896
1897 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc));
1898 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1899 if (rx_got != rx_size) {
1900 ret = -1;
1901 goto out;
1902 }
1903
1904 if (conn->conn_ops->DataDigest) {
1905 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1906 payload_length, padding,
1907 cmd->pad_bytes, &data_crc);
1908
1909 if (checksum != data_crc) {
1910 pr_err("Ping data CRC32C DataDigest"
1911 " 0x%08x does not match computed 0x%08x\n",
1912 checksum, data_crc);
1913 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1914 pr_err("Unable to recover from"
1915 " NOPOUT Ping DataCRC failure while in"
1916 " ERL=0.\n");
1917 ret = -1;
1918 goto out;
1919 } else {
1920 /*
1921 * Silently drop this PDU and let the
1922 * initiator plug the CmdSN gap.
1923 */
1924 pr_debug("Dropping NOPOUT"
1925 " Command CmdSN: 0x%08x due to"
1926 " DataCRC error.\n", hdr->cmdsn);
1927 ret = 0;
1928 goto out;
1929 }
1930 } else {
1931 pr_debug("Got CRC32C DataDigest"
1932 " 0x%08x for %u bytes of ping data.\n",
1933 checksum, payload_length);
1934 }
1935 }
1936
1937 ping_data[payload_length] = '\0';
1938 /*
1939 * Attach ping data to struct iscsit_cmd->buf_ptr.
1940 */
1941 cmd->buf_ptr = ping_data;
1942 cmd->buf_ptr_size = payload_length;
1943
1944 pr_debug("Got %u bytes of NOPOUT ping"
1945 " data.\n", payload_length);
1946 pr_debug("Ping Data: \"%s\"\n", ping_data);
1947 }
1948
1949 return iscsit_process_nop_out(conn, cmd, hdr);
1950 out:
1951 if (cmd)
1952 iscsit_free_cmd(cmd, false);
1953
1954 kfree(ping_data);
1955 return ret;
1956 }
1957
iscsit_convert_tmf(u8 iscsi_tmf)1958 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1959 {
1960 switch (iscsi_tmf) {
1961 case ISCSI_TM_FUNC_ABORT_TASK:
1962 return TMR_ABORT_TASK;
1963 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1964 return TMR_ABORT_TASK_SET;
1965 case ISCSI_TM_FUNC_CLEAR_ACA:
1966 return TMR_CLEAR_ACA;
1967 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1968 return TMR_CLEAR_TASK_SET;
1969 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1970 return TMR_LUN_RESET;
1971 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1972 return TMR_TARGET_WARM_RESET;
1973 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1974 return TMR_TARGET_COLD_RESET;
1975 default:
1976 return TMR_UNKNOWN;
1977 }
1978 }
1979
1980 int
iscsit_handle_task_mgt_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)1981 iscsit_handle_task_mgt_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1982 unsigned char *buf)
1983 {
1984 struct se_tmr_req *se_tmr;
1985 struct iscsi_tmr_req *tmr_req;
1986 struct iscsi_tm *hdr;
1987 int out_of_order_cmdsn = 0, ret;
1988 u8 function, tcm_function = TMR_UNKNOWN;
1989
1990 hdr = (struct iscsi_tm *) buf;
1991 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1992 function = hdr->flags;
1993
1994 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1995 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1996 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1997 hdr->rtt, hdr->refcmdsn, conn->cid);
1998
1999 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2000 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2001 hdr->rtt != RESERVED_ITT)) {
2002 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
2003 hdr->rtt = RESERVED_ITT;
2004 }
2005
2006 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
2007 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2008 pr_err("Task Management Request TASK_REASSIGN not"
2009 " issued as immediate command, bad iSCSI Initiator"
2010 "implementation\n");
2011 return iscsit_add_reject_cmd(cmd,
2012 ISCSI_REASON_PROTOCOL_ERROR, buf);
2013 }
2014 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2015 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
2016 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
2017
2018 cmd->data_direction = DMA_NONE;
2019 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
2020 if (!cmd->tmr_req) {
2021 return iscsit_add_reject_cmd(cmd,
2022 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2023 buf);
2024 }
2025
2026 __target_init_cmd(&cmd->se_cmd, &iscsi_ops,
2027 conn->sess->se_sess, 0, DMA_NONE,
2028 TCM_SIMPLE_TAG, cmd->sense_buffer + 2,
2029 scsilun_to_int(&hdr->lun));
2030
2031 target_get_sess_cmd(&cmd->se_cmd, true);
2032
2033 /*
2034 * TASK_REASSIGN for ERL=2 / connection stays inside of
2035 * LIO-Target $FABRIC_MOD
2036 */
2037 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2038 tcm_function = iscsit_convert_tmf(function);
2039 if (tcm_function == TMR_UNKNOWN) {
2040 pr_err("Unknown iSCSI TMR Function:"
2041 " 0x%02x\n", function);
2042 return iscsit_add_reject_cmd(cmd,
2043 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2044 }
2045 }
2046 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2047 GFP_KERNEL);
2048 if (ret < 0)
2049 return iscsit_add_reject_cmd(cmd,
2050 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2051
2052 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2053
2054 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2055 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2056 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2057 cmd->init_task_tag = hdr->itt;
2058 cmd->targ_xfer_tag = 0xFFFFFFFF;
2059 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2060 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2061 se_tmr = cmd->se_cmd.se_tmr_req;
2062 tmr_req = cmd->tmr_req;
2063 /*
2064 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2065 */
2066 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2067 ret = transport_lookup_tmr_lun(&cmd->se_cmd);
2068 if (ret < 0) {
2069 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2070 goto attach;
2071 }
2072 }
2073
2074 switch (function) {
2075 case ISCSI_TM_FUNC_ABORT_TASK:
2076 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2077 if (se_tmr->response)
2078 goto attach;
2079 break;
2080 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2081 case ISCSI_TM_FUNC_CLEAR_ACA:
2082 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2083 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2084 break;
2085 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2086 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2087 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2088 goto attach;
2089 }
2090 break;
2091 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2092 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2093 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2094 goto attach;
2095 }
2096 break;
2097 case ISCSI_TM_FUNC_TASK_REASSIGN:
2098 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2099 /*
2100 * Perform sanity checks on the ExpDataSN only if the
2101 * TASK_REASSIGN was successful.
2102 */
2103 if (se_tmr->response)
2104 break;
2105
2106 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2107 return iscsit_add_reject_cmd(cmd,
2108 ISCSI_REASON_BOOKMARK_INVALID, buf);
2109 break;
2110 default:
2111 pr_err("Unknown TMR function: 0x%02x, protocol"
2112 " error.\n", function);
2113 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2114 goto attach;
2115 }
2116
2117 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2118 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2119 se_tmr->call_transport = 1;
2120 attach:
2121 spin_lock_bh(&conn->cmd_lock);
2122 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2123 spin_unlock_bh(&conn->cmd_lock);
2124
2125 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2126 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2127 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2128 out_of_order_cmdsn = 1;
2129 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2130 target_put_sess_cmd(&cmd->se_cmd);
2131 return 0;
2132 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2133 return -1;
2134 }
2135 }
2136 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2137
2138 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2139 return 0;
2140 /*
2141 * Found the referenced task, send to transport for processing.
2142 */
2143 if (se_tmr->call_transport)
2144 return transport_generic_handle_tmr(&cmd->se_cmd);
2145
2146 /*
2147 * Could not find the referenced LUN, task, or Task Management
2148 * command not authorized or supported. Change state and
2149 * let the tx_thread send the response.
2150 *
2151 * For connection recovery, this is also the default action for
2152 * TMR TASK_REASSIGN.
2153 */
2154 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2155 target_put_sess_cmd(&cmd->se_cmd);
2156 return 0;
2157 }
2158 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2159
2160 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2161 int
iscsit_setup_text_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_text * hdr)2162 iscsit_setup_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2163 struct iscsi_text *hdr)
2164 {
2165 u32 payload_length = ntoh24(hdr->dlength);
2166
2167 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2168 pr_err("Unable to accept text parameter length: %u"
2169 "greater than MaxXmitDataSegmentLength %u.\n",
2170 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2171 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2172 (unsigned char *)hdr);
2173 }
2174
2175 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2176 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2177 pr_err("Multi sequence text commands currently not supported\n");
2178 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2179 (unsigned char *)hdr);
2180 }
2181
2182 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2183 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2184 hdr->exp_statsn, payload_length);
2185
2186 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2187 cmd->i_state = ISTATE_SEND_TEXTRSP;
2188 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2189 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2190 cmd->targ_xfer_tag = 0xFFFFFFFF;
2191 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2192 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2193 cmd->data_direction = DMA_NONE;
2194 kfree(cmd->text_in_ptr);
2195 cmd->text_in_ptr = NULL;
2196
2197 return 0;
2198 }
2199 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2200
2201 int
iscsit_process_text_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_text * hdr)2202 iscsit_process_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2203 struct iscsi_text *hdr)
2204 {
2205 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2206 int cmdsn_ret;
2207
2208 if (!text_in) {
2209 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2210 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2211 pr_err("Unable to locate text_in buffer for sendtargets"
2212 " discovery\n");
2213 goto reject;
2214 }
2215 goto empty_sendtargets;
2216 }
2217 if (strncmp("SendTargets=", text_in, 12) != 0) {
2218 pr_err("Received Text Data that is not"
2219 " SendTargets, cannot continue.\n");
2220 goto reject;
2221 }
2222 /* '=' confirmed in strncmp */
2223 text_ptr = strchr(text_in, '=');
2224 BUG_ON(!text_ptr);
2225 if (!strncmp("=All", text_ptr, 5)) {
2226 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2227 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2228 !strncmp("=eui.", text_ptr, 5)) {
2229 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2230 } else {
2231 pr_err("Unable to locate valid SendTargets%s value\n",
2232 text_ptr);
2233 goto reject;
2234 }
2235
2236 spin_lock_bh(&conn->cmd_lock);
2237 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2238 spin_unlock_bh(&conn->cmd_lock);
2239
2240 empty_sendtargets:
2241 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2242
2243 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2244 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2245 (unsigned char *)hdr, hdr->cmdsn);
2246 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2247 return -1;
2248
2249 return 0;
2250 }
2251
2252 return iscsit_execute_cmd(cmd, 0);
2253
2254 reject:
2255 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2256 (unsigned char *)hdr);
2257 }
2258 EXPORT_SYMBOL(iscsit_process_text_cmd);
2259
2260 static int
iscsit_handle_text_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)2261 iscsit_handle_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2262 unsigned char *buf)
2263 {
2264 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2265 char *text_in = NULL;
2266 u32 payload_length = ntoh24(hdr->dlength);
2267 int rx_size, rc;
2268
2269 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2270 if (rc < 0)
2271 return 0;
2272
2273 rx_size = payload_length;
2274 if (payload_length) {
2275 u32 checksum = 0, data_crc = 0;
2276 u32 padding = 0;
2277 int niov = 0, rx_got;
2278 struct kvec iov[2];
2279
2280 rx_size = ALIGN(payload_length, 4);
2281 text_in = kzalloc(rx_size, GFP_KERNEL);
2282 if (!text_in)
2283 goto reject;
2284
2285 cmd->text_in_ptr = text_in;
2286
2287 memset(iov, 0, sizeof(iov));
2288 iov[niov].iov_base = text_in;
2289 iov[niov++].iov_len = rx_size;
2290
2291 padding = rx_size - payload_length;
2292 if (padding)
2293 pr_debug("Receiving %u additional bytes"
2294 " for padding.\n", padding);
2295 if (conn->conn_ops->DataDigest) {
2296 iov[niov].iov_base = &checksum;
2297 iov[niov++].iov_len = ISCSI_CRC_LEN;
2298 rx_size += ISCSI_CRC_LEN;
2299 }
2300
2301 WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
2302 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2303 if (rx_got != rx_size)
2304 goto reject;
2305
2306 if (conn->conn_ops->DataDigest) {
2307 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2308 text_in, rx_size, 0, NULL,
2309 &data_crc);
2310
2311 if (checksum != data_crc) {
2312 pr_err("Text data CRC32C DataDigest"
2313 " 0x%08x does not match computed"
2314 " 0x%08x\n", checksum, data_crc);
2315 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2316 pr_err("Unable to recover from"
2317 " Text Data digest failure while in"
2318 " ERL=0.\n");
2319 goto reject;
2320 } else {
2321 /*
2322 * Silently drop this PDU and let the
2323 * initiator plug the CmdSN gap.
2324 */
2325 pr_debug("Dropping Text"
2326 " Command CmdSN: 0x%08x due to"
2327 " DataCRC error.\n", hdr->cmdsn);
2328 kfree(text_in);
2329 return 0;
2330 }
2331 } else {
2332 pr_debug("Got CRC32C DataDigest"
2333 " 0x%08x for %u bytes of text data.\n",
2334 checksum, payload_length);
2335 }
2336 }
2337 text_in[payload_length - 1] = '\0';
2338 pr_debug("Successfully read %d bytes of text"
2339 " data.\n", payload_length);
2340 }
2341
2342 return iscsit_process_text_cmd(conn, cmd, hdr);
2343
2344 reject:
2345 kfree(cmd->text_in_ptr);
2346 cmd->text_in_ptr = NULL;
2347 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2348 }
2349
iscsit_logout_closesession(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2350 int iscsit_logout_closesession(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2351 {
2352 struct iscsit_conn *conn_p;
2353 struct iscsit_session *sess = conn->sess;
2354
2355 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2356 " for SID: %u.\n", conn->cid, conn->sess->sid);
2357
2358 atomic_set(&sess->session_logout, 1);
2359 atomic_set(&conn->conn_logout_remove, 1);
2360 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2361
2362 iscsit_inc_conn_usage_count(conn);
2363 iscsit_inc_session_usage_count(sess);
2364
2365 spin_lock_bh(&sess->conn_lock);
2366 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2367 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2368 continue;
2369
2370 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2371 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2372 }
2373 spin_unlock_bh(&sess->conn_lock);
2374
2375 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2376
2377 return 0;
2378 }
2379
iscsit_logout_closeconnection(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2380 int iscsit_logout_closeconnection(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2381 {
2382 struct iscsit_conn *l_conn;
2383 struct iscsit_session *sess = conn->sess;
2384
2385 pr_debug("Received logout request CLOSECONNECTION for CID:"
2386 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2387
2388 /*
2389 * A Logout Request with a CLOSECONNECTION reason code for a CID
2390 * can arrive on a connection with a differing CID.
2391 */
2392 if (conn->cid == cmd->logout_cid) {
2393 spin_lock_bh(&conn->state_lock);
2394 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2395 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2396
2397 atomic_set(&conn->conn_logout_remove, 1);
2398 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2399 iscsit_inc_conn_usage_count(conn);
2400
2401 spin_unlock_bh(&conn->state_lock);
2402 } else {
2403 /*
2404 * Handle all different cid CLOSECONNECTION requests in
2405 * iscsit_logout_post_handler_diffcid() as to give enough
2406 * time for any non immediate command's CmdSN to be
2407 * acknowledged on the connection in question.
2408 *
2409 * Here we simply make sure the CID is still around.
2410 */
2411 l_conn = iscsit_get_conn_from_cid(sess,
2412 cmd->logout_cid);
2413 if (!l_conn) {
2414 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2415 iscsit_add_cmd_to_response_queue(cmd, conn,
2416 cmd->i_state);
2417 return 0;
2418 }
2419
2420 iscsit_dec_conn_usage_count(l_conn);
2421 }
2422
2423 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2424
2425 return 0;
2426 }
2427
iscsit_logout_removeconnforrecovery(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2428 int iscsit_logout_removeconnforrecovery(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2429 {
2430 struct iscsit_session *sess = conn->sess;
2431
2432 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2433 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2434
2435 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2436 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2437 " while ERL!=2.\n");
2438 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2439 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2440 return 0;
2441 }
2442
2443 if (conn->cid == cmd->logout_cid) {
2444 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2445 " with CID: %hu on CID: %hu, implementation error.\n",
2446 cmd->logout_cid, conn->cid);
2447 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2448 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2449 return 0;
2450 }
2451
2452 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2453
2454 return 0;
2455 }
2456
2457 int
iscsit_handle_logout_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)2458 iscsit_handle_logout_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2459 unsigned char *buf)
2460 {
2461 int cmdsn_ret, logout_remove = 0;
2462 u8 reason_code = 0;
2463 struct iscsi_logout *hdr;
2464 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2465
2466 hdr = (struct iscsi_logout *) buf;
2467 reason_code = (hdr->flags & 0x7f);
2468
2469 if (tiqn) {
2470 spin_lock(&tiqn->logout_stats.lock);
2471 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2472 tiqn->logout_stats.normal_logouts++;
2473 else
2474 tiqn->logout_stats.abnormal_logouts++;
2475 spin_unlock(&tiqn->logout_stats.lock);
2476 }
2477
2478 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2479 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2480 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2481 hdr->cid, conn->cid);
2482
2483 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2484 pr_err("Received logout request on connection that"
2485 " is not in logged in state, ignoring request.\n");
2486 iscsit_free_cmd(cmd, false);
2487 return 0;
2488 }
2489
2490 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2491 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2492 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2493 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2494 cmd->targ_xfer_tag = 0xFFFFFFFF;
2495 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2496 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2497 cmd->logout_cid = be16_to_cpu(hdr->cid);
2498 cmd->logout_reason = reason_code;
2499 cmd->data_direction = DMA_NONE;
2500
2501 /*
2502 * We need to sleep in these cases (by returning 1) until the Logout
2503 * Response gets sent in the tx thread.
2504 */
2505 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2506 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2507 be16_to_cpu(hdr->cid) == conn->cid))
2508 logout_remove = 1;
2509
2510 spin_lock_bh(&conn->cmd_lock);
2511 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2512 spin_unlock_bh(&conn->cmd_lock);
2513
2514 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2515 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2516
2517 /*
2518 * Immediate commands are executed, well, immediately.
2519 * Non-Immediate Logout Commands are executed in CmdSN order.
2520 */
2521 if (cmd->immediate_cmd) {
2522 int ret = iscsit_execute_cmd(cmd, 0);
2523
2524 if (ret < 0)
2525 return ret;
2526 } else {
2527 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2528 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2529 logout_remove = 0;
2530 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2531 return -1;
2532 }
2533
2534 return logout_remove;
2535 }
2536 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2537
iscsit_handle_snack(struct iscsit_conn * conn,unsigned char * buf)2538 int iscsit_handle_snack(
2539 struct iscsit_conn *conn,
2540 unsigned char *buf)
2541 {
2542 struct iscsi_snack *hdr;
2543
2544 hdr = (struct iscsi_snack *) buf;
2545 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2546
2547 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2548 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2549 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2550 hdr->begrun, hdr->runlength, conn->cid);
2551
2552 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2553 pr_err("Initiator sent SNACK request while in"
2554 " ErrorRecoveryLevel=0.\n");
2555 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2556 buf);
2557 }
2558 /*
2559 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2560 * call from inside iscsi_send_recovery_datain_or_r2t().
2561 */
2562 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2563 case 0:
2564 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2565 hdr->itt,
2566 be32_to_cpu(hdr->ttt),
2567 be32_to_cpu(hdr->begrun),
2568 be32_to_cpu(hdr->runlength));
2569 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2570 return iscsit_handle_status_snack(conn, hdr->itt,
2571 be32_to_cpu(hdr->ttt),
2572 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2573 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2574 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2575 be32_to_cpu(hdr->begrun),
2576 be32_to_cpu(hdr->runlength));
2577 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2578 /* FIXME: Support R-Data SNACK */
2579 pr_err("R-Data SNACK Not Supported.\n");
2580 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2581 buf);
2582 default:
2583 pr_err("Unknown SNACK type 0x%02x, protocol"
2584 " error.\n", hdr->flags & 0x0f);
2585 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2586 buf);
2587 }
2588
2589 return 0;
2590 }
2591 EXPORT_SYMBOL(iscsit_handle_snack);
2592
iscsit_rx_thread_wait_for_tcp(struct iscsit_conn * conn)2593 static void iscsit_rx_thread_wait_for_tcp(struct iscsit_conn *conn)
2594 {
2595 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2596 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2597 wait_for_completion_interruptible_timeout(
2598 &conn->rx_half_close_comp,
2599 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2600 }
2601 }
2602
iscsit_handle_immediate_data(struct iscsit_cmd * cmd,struct iscsi_scsi_req * hdr,u32 length)2603 static int iscsit_handle_immediate_data(
2604 struct iscsit_cmd *cmd,
2605 struct iscsi_scsi_req *hdr,
2606 u32 length)
2607 {
2608 int iov_ret, rx_got = 0, rx_size = 0;
2609 u32 checksum, iov_count = 0, padding = 0;
2610 struct iscsit_conn *conn = cmd->conn;
2611 struct kvec *iov;
2612 void *overflow_buf = NULL;
2613
2614 BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
2615 rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
2616 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
2617 cmd->orig_iov_data_count - 2,
2618 cmd->write_data_done, rx_size);
2619 if (iov_ret < 0)
2620 return IMMEDIATE_DATA_CANNOT_RECOVER;
2621
2622 iov_count = iov_ret;
2623 iov = &cmd->iov_data[0];
2624 if (rx_size < length) {
2625 /*
2626 * Special case: length of immediate data exceeds the data
2627 * buffer size derived from the CDB.
2628 */
2629 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
2630 if (!overflow_buf) {
2631 iscsit_unmap_iovec(cmd);
2632 return IMMEDIATE_DATA_CANNOT_RECOVER;
2633 }
2634 cmd->overflow_buf = overflow_buf;
2635 iov[iov_count].iov_base = overflow_buf;
2636 iov[iov_count].iov_len = length - rx_size;
2637 iov_count++;
2638 rx_size = length;
2639 }
2640
2641 padding = ((-length) & 3);
2642 if (padding != 0) {
2643 iov[iov_count].iov_base = cmd->pad_bytes;
2644 iov[iov_count++].iov_len = padding;
2645 rx_size += padding;
2646 }
2647
2648 if (conn->conn_ops->DataDigest) {
2649 iov[iov_count].iov_base = &checksum;
2650 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2651 rx_size += ISCSI_CRC_LEN;
2652 }
2653
2654 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
2655 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2656
2657 iscsit_unmap_iovec(cmd);
2658
2659 if (rx_got != rx_size) {
2660 iscsit_rx_thread_wait_for_tcp(conn);
2661 return IMMEDIATE_DATA_CANNOT_RECOVER;
2662 }
2663
2664 if (conn->conn_ops->DataDigest) {
2665 u32 data_crc;
2666
2667 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2668 cmd->write_data_done, length, padding,
2669 cmd->pad_bytes);
2670
2671 if (checksum != data_crc) {
2672 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2673 " does not match computed 0x%08x\n", checksum,
2674 data_crc);
2675
2676 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2677 pr_err("Unable to recover from"
2678 " Immediate Data digest failure while"
2679 " in ERL=0.\n");
2680 iscsit_reject_cmd(cmd,
2681 ISCSI_REASON_DATA_DIGEST_ERROR,
2682 (unsigned char *)hdr);
2683 return IMMEDIATE_DATA_CANNOT_RECOVER;
2684 } else {
2685 iscsit_reject_cmd(cmd,
2686 ISCSI_REASON_DATA_DIGEST_ERROR,
2687 (unsigned char *)hdr);
2688 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2689 }
2690 } else {
2691 pr_debug("Got CRC32C DataDigest 0x%08x for"
2692 " %u bytes of Immediate Data\n", checksum,
2693 length);
2694 }
2695 }
2696
2697 cmd->write_data_done += length;
2698
2699 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2700 spin_lock_bh(&cmd->istate_lock);
2701 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2702 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2703 spin_unlock_bh(&cmd->istate_lock);
2704 }
2705
2706 return IMMEDIATE_DATA_NORMAL_OPERATION;
2707 }
2708
2709 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2710 with active network interface */
iscsit_build_conn_drop_async_message(struct iscsit_conn * conn)2711 static void iscsit_build_conn_drop_async_message(struct iscsit_conn *conn)
2712 {
2713 struct iscsit_cmd *cmd;
2714 struct iscsit_conn *conn_p;
2715 bool found = false;
2716
2717 lockdep_assert_held(&conn->sess->conn_lock);
2718
2719 /*
2720 * Only send a Asynchronous Message on connections whos network
2721 * interface is still functional.
2722 */
2723 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2724 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2725 iscsit_inc_conn_usage_count(conn_p);
2726 found = true;
2727 break;
2728 }
2729 }
2730
2731 if (!found)
2732 return;
2733
2734 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2735 if (!cmd) {
2736 iscsit_dec_conn_usage_count(conn_p);
2737 return;
2738 }
2739
2740 cmd->logout_cid = conn->cid;
2741 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2742 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2743
2744 spin_lock_bh(&conn_p->cmd_lock);
2745 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2746 spin_unlock_bh(&conn_p->cmd_lock);
2747
2748 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2749 iscsit_dec_conn_usage_count(conn_p);
2750 }
2751
iscsit_send_conn_drop_async_message(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2752 static int iscsit_send_conn_drop_async_message(
2753 struct iscsit_cmd *cmd,
2754 struct iscsit_conn *conn)
2755 {
2756 struct iscsi_async *hdr;
2757
2758 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2759
2760 hdr = (struct iscsi_async *) cmd->pdu;
2761 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2762 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2763 cmd->init_task_tag = RESERVED_ITT;
2764 cmd->targ_xfer_tag = 0xFFFFFFFF;
2765 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2766 cmd->stat_sn = conn->stat_sn++;
2767 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2768 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2769 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2770 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2771 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2772 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2773 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2774
2775 pr_debug("Sending Connection Dropped Async Message StatSN:"
2776 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2777 cmd->logout_cid, conn->cid);
2778
2779 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2780 }
2781
iscsit_tx_thread_wait_for_tcp(struct iscsit_conn * conn)2782 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *conn)
2783 {
2784 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2785 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2786 wait_for_completion_interruptible_timeout(
2787 &conn->tx_half_close_comp,
2788 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2789 }
2790 }
2791
2792 void
iscsit_build_datain_pdu(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_datain * datain,struct iscsi_data_rsp * hdr,bool set_statsn)2793 iscsit_build_datain_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2794 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2795 bool set_statsn)
2796 {
2797 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2798 hdr->flags = datain->flags;
2799 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2800 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2801 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2802 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2803 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2804 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2805 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2806 }
2807 }
2808 hton24(hdr->dlength, datain->length);
2809 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2810 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2811 (struct scsi_lun *)&hdr->lun);
2812 else
2813 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2814
2815 hdr->itt = cmd->init_task_tag;
2816
2817 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2818 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2819 else
2820 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2821 if (set_statsn)
2822 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2823 else
2824 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2825
2826 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2827 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2828 hdr->datasn = cpu_to_be32(datain->data_sn);
2829 hdr->offset = cpu_to_be32(datain->offset);
2830
2831 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2832 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2833 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2834 ntohl(hdr->offset), datain->length, conn->cid);
2835 }
2836 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2837
iscsit_send_datain(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2838 static int iscsit_send_datain(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2839 {
2840 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2841 struct iscsi_datain datain;
2842 struct iscsi_datain_req *dr;
2843 int eodr = 0, ret;
2844 bool set_statsn = false;
2845
2846 memset(&datain, 0, sizeof(struct iscsi_datain));
2847 dr = iscsit_get_datain_values(cmd, &datain);
2848 if (!dr) {
2849 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2850 cmd->init_task_tag);
2851 return -1;
2852 }
2853 /*
2854 * Be paranoid and double check the logic for now.
2855 */
2856 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2857 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2858 " datain.length: %u exceeds cmd->data_length: %u\n",
2859 cmd->init_task_tag, datain.offset, datain.length,
2860 cmd->se_cmd.data_length);
2861 return -1;
2862 }
2863
2864 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2865 /*
2866 * Special case for successfully execution w/ both DATAIN
2867 * and Sense Data.
2868 */
2869 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2870 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2871 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2872 else {
2873 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2874 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2875 iscsit_increment_maxcmdsn(cmd, conn->sess);
2876 cmd->stat_sn = conn->stat_sn++;
2877 set_statsn = true;
2878 } else if (dr->dr_complete ==
2879 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2880 set_statsn = true;
2881 }
2882
2883 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2884
2885 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2886 if (ret < 0)
2887 return ret;
2888
2889 if (dr->dr_complete) {
2890 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2891 2 : 1;
2892 iscsit_free_datain_req(cmd, dr);
2893 }
2894
2895 return eodr;
2896 }
2897
2898 int
iscsit_build_logout_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_logout_rsp * hdr)2899 iscsit_build_logout_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2900 struct iscsi_logout_rsp *hdr)
2901 {
2902 struct iscsit_conn *logout_conn = NULL;
2903 struct iscsi_conn_recovery *cr = NULL;
2904 struct iscsit_session *sess = conn->sess;
2905 /*
2906 * The actual shutting down of Sessions and/or Connections
2907 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2908 * is done in scsi_logout_post_handler().
2909 */
2910 switch (cmd->logout_reason) {
2911 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2912 pr_debug("iSCSI session logout successful, setting"
2913 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2914 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2915 break;
2916 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2917 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2918 break;
2919 /*
2920 * For CLOSECONNECTION logout requests carrying
2921 * a matching logout CID -> local CID, the reference
2922 * for the local CID will have been incremented in
2923 * iscsi_logout_closeconnection().
2924 *
2925 * For CLOSECONNECTION logout requests carrying
2926 * a different CID than the connection it arrived
2927 * on, the connection responding to cmd->logout_cid
2928 * is stopped in iscsit_logout_post_handler_diffcid().
2929 */
2930
2931 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2932 " successful.\n", cmd->logout_cid, conn->cid);
2933 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2934 break;
2935 case ISCSI_LOGOUT_REASON_RECOVERY:
2936 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2937 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2938 break;
2939 /*
2940 * If the connection is still active from our point of view
2941 * force connection recovery to occur.
2942 */
2943 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2944 cmd->logout_cid);
2945 if (logout_conn) {
2946 iscsit_connection_reinstatement_rcfr(logout_conn);
2947 iscsit_dec_conn_usage_count(logout_conn);
2948 }
2949
2950 cr = iscsit_get_inactive_connection_recovery_entry(
2951 conn->sess, cmd->logout_cid);
2952 if (!cr) {
2953 pr_err("Unable to locate CID: %hu for"
2954 " REMOVECONNFORRECOVERY Logout Request.\n",
2955 cmd->logout_cid);
2956 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2957 break;
2958 }
2959
2960 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2961
2962 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2963 " for recovery for CID: %hu on CID: %hu successful.\n",
2964 cmd->logout_cid, conn->cid);
2965 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2966 break;
2967 default:
2968 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2969 cmd->logout_reason);
2970 return -1;
2971 }
2972
2973 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2974 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2975 hdr->response = cmd->logout_response;
2976 hdr->itt = cmd->init_task_tag;
2977 cmd->stat_sn = conn->stat_sn++;
2978 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2979
2980 iscsit_increment_maxcmdsn(cmd, conn->sess);
2981 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2982 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2983
2984 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2985 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2986 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2987 cmd->logout_cid, conn->cid);
2988
2989 return 0;
2990 }
2991 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2992
2993 static int
iscsit_send_logout(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2994 iscsit_send_logout(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2995 {
2996 int rc;
2997
2998 rc = iscsit_build_logout_rsp(cmd, conn,
2999 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
3000 if (rc < 0)
3001 return rc;
3002
3003 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3004 }
3005
3006 void
iscsit_build_nopin_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_nopin * hdr,bool nopout_response)3007 iscsit_build_nopin_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3008 struct iscsi_nopin *hdr, bool nopout_response)
3009 {
3010 hdr->opcode = ISCSI_OP_NOOP_IN;
3011 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3012 hton24(hdr->dlength, cmd->buf_ptr_size);
3013 if (nopout_response)
3014 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
3015 hdr->itt = cmd->init_task_tag;
3016 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3017 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
3018 conn->stat_sn;
3019 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3020
3021 if (nopout_response)
3022 iscsit_increment_maxcmdsn(cmd, conn->sess);
3023
3024 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3025 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3026
3027 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3028 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3029 "Solicited" : "Unsolicited", cmd->init_task_tag,
3030 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3031 }
3032 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3033
3034 /*
3035 * Unsolicited NOPIN, either requesting a response or not.
3036 */
iscsit_send_unsolicited_nopin(struct iscsit_cmd * cmd,struct iscsit_conn * conn,int want_response)3037 static int iscsit_send_unsolicited_nopin(
3038 struct iscsit_cmd *cmd,
3039 struct iscsit_conn *conn,
3040 int want_response)
3041 {
3042 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3043 int ret;
3044
3045 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3046
3047 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3048 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3049
3050 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3051 if (ret < 0)
3052 return ret;
3053
3054 spin_lock_bh(&cmd->istate_lock);
3055 cmd->i_state = want_response ?
3056 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3057 spin_unlock_bh(&cmd->istate_lock);
3058
3059 return 0;
3060 }
3061
3062 static int
iscsit_send_nopin(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3063 iscsit_send_nopin(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3064 {
3065 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3066
3067 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3068
3069 /*
3070 * NOPOUT Ping Data is attached to struct iscsit_cmd->buf_ptr.
3071 * NOPOUT DataSegmentLength is at struct iscsit_cmd->buf_ptr_size.
3072 */
3073 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3074
3075 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3076 cmd->buf_ptr,
3077 cmd->buf_ptr_size);
3078 }
3079
iscsit_send_r2t(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3080 static int iscsit_send_r2t(
3081 struct iscsit_cmd *cmd,
3082 struct iscsit_conn *conn)
3083 {
3084 struct iscsi_r2t *r2t;
3085 struct iscsi_r2t_rsp *hdr;
3086 int ret;
3087
3088 r2t = iscsit_get_r2t_from_list(cmd);
3089 if (!r2t)
3090 return -1;
3091
3092 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3093 memset(hdr, 0, ISCSI_HDR_LEN);
3094 hdr->opcode = ISCSI_OP_R2T;
3095 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3096 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3097 (struct scsi_lun *)&hdr->lun);
3098 hdr->itt = cmd->init_task_tag;
3099 if (conn->conn_transport->iscsit_get_r2t_ttt)
3100 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3101 else
3102 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3103 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3104 hdr->statsn = cpu_to_be32(conn->stat_sn);
3105 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3106 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3107 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3108 hdr->data_offset = cpu_to_be32(r2t->offset);
3109 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3110
3111 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3112 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3113 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3114 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3115 r2t->offset, r2t->xfer_len, conn->cid);
3116
3117 spin_lock_bh(&cmd->r2t_lock);
3118 r2t->sent_r2t = 1;
3119 spin_unlock_bh(&cmd->r2t_lock);
3120
3121 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3122 if (ret < 0) {
3123 return ret;
3124 }
3125
3126 spin_lock_bh(&cmd->dataout_timeout_lock);
3127 iscsit_start_dataout_timer(cmd, conn);
3128 spin_unlock_bh(&cmd->dataout_timeout_lock);
3129
3130 return 0;
3131 }
3132
3133 /*
3134 * @recovery: If called from iscsi_task_reassign_complete_write() for
3135 * connection recovery.
3136 */
iscsit_build_r2ts_for_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,bool recovery)3137 int iscsit_build_r2ts_for_cmd(
3138 struct iscsit_conn *conn,
3139 struct iscsit_cmd *cmd,
3140 bool recovery)
3141 {
3142 int first_r2t = 1;
3143 u32 offset = 0, xfer_len = 0;
3144
3145 spin_lock_bh(&cmd->r2t_lock);
3146 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3147 spin_unlock_bh(&cmd->r2t_lock);
3148 return 0;
3149 }
3150
3151 if (conn->sess->sess_ops->DataSequenceInOrder &&
3152 !recovery)
3153 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3154
3155 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3156 if (conn->sess->sess_ops->DataSequenceInOrder) {
3157 offset = cmd->r2t_offset;
3158
3159 if (first_r2t && recovery) {
3160 int new_data_end = offset +
3161 conn->sess->sess_ops->MaxBurstLength -
3162 cmd->next_burst_len;
3163
3164 if (new_data_end > cmd->se_cmd.data_length)
3165 xfer_len = cmd->se_cmd.data_length - offset;
3166 else
3167 xfer_len =
3168 conn->sess->sess_ops->MaxBurstLength -
3169 cmd->next_burst_len;
3170 } else {
3171 int new_data_end = offset +
3172 conn->sess->sess_ops->MaxBurstLength;
3173
3174 if (new_data_end > cmd->se_cmd.data_length)
3175 xfer_len = cmd->se_cmd.data_length - offset;
3176 else
3177 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3178 }
3179
3180 if ((s32)xfer_len < 0) {
3181 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3182 break;
3183 }
3184
3185 cmd->r2t_offset += xfer_len;
3186
3187 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3188 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3189 } else {
3190 struct iscsi_seq *seq;
3191
3192 seq = iscsit_get_seq_holder_for_r2t(cmd);
3193 if (!seq) {
3194 spin_unlock_bh(&cmd->r2t_lock);
3195 return -1;
3196 }
3197
3198 offset = seq->offset;
3199 xfer_len = seq->xfer_len;
3200
3201 if (cmd->seq_send_order == cmd->seq_count)
3202 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3203 }
3204 cmd->outstanding_r2ts++;
3205 first_r2t = 0;
3206
3207 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3208 spin_unlock_bh(&cmd->r2t_lock);
3209 return -1;
3210 }
3211
3212 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3213 break;
3214 }
3215 spin_unlock_bh(&cmd->r2t_lock);
3216
3217 return 0;
3218 }
3219 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3220
iscsit_build_rsp_pdu(struct iscsit_cmd * cmd,struct iscsit_conn * conn,bool inc_stat_sn,struct iscsi_scsi_rsp * hdr)3221 void iscsit_build_rsp_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3222 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3223 {
3224 if (inc_stat_sn)
3225 cmd->stat_sn = conn->stat_sn++;
3226
3227 atomic_long_inc(&conn->sess->rsp_pdus);
3228
3229 memset(hdr, 0, ISCSI_HDR_LEN);
3230 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3231 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3232 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3233 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3234 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3235 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3236 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3237 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3238 }
3239 hdr->response = cmd->iscsi_response;
3240 hdr->cmd_status = cmd->se_cmd.scsi_status;
3241 hdr->itt = cmd->init_task_tag;
3242 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3243
3244 iscsit_increment_maxcmdsn(cmd, conn->sess);
3245 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3246 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3247
3248 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3249 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3250 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3251 cmd->se_cmd.scsi_status, conn->cid);
3252 }
3253 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3254
iscsit_send_response(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3255 static int iscsit_send_response(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3256 {
3257 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3258 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3259 void *data_buf = NULL;
3260 u32 padding = 0, data_buf_len = 0;
3261
3262 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3263
3264 /*
3265 * Attach SENSE DATA payload to iSCSI Response PDU
3266 */
3267 if (cmd->se_cmd.sense_buffer &&
3268 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3269 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3270 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3271 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3272
3273 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3274 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3275 data_buf = cmd->sense_buffer;
3276 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3277
3278 if (padding) {
3279 memset(cmd->sense_buffer +
3280 cmd->se_cmd.scsi_sense_length, 0, padding);
3281 pr_debug("Adding %u bytes of padding to"
3282 " SENSE.\n", padding);
3283 }
3284
3285 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3286 " Response PDU\n",
3287 cmd->se_cmd.scsi_sense_length);
3288 }
3289
3290 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3291 data_buf_len);
3292 }
3293
iscsit_convert_tcm_tmr_rsp(struct se_tmr_req * se_tmr)3294 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3295 {
3296 switch (se_tmr->response) {
3297 case TMR_FUNCTION_COMPLETE:
3298 return ISCSI_TMF_RSP_COMPLETE;
3299 case TMR_TASK_DOES_NOT_EXIST:
3300 return ISCSI_TMF_RSP_NO_TASK;
3301 case TMR_LUN_DOES_NOT_EXIST:
3302 return ISCSI_TMF_RSP_NO_LUN;
3303 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3304 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3305 case TMR_FUNCTION_REJECTED:
3306 default:
3307 return ISCSI_TMF_RSP_REJECTED;
3308 }
3309 }
3310
3311 void
iscsit_build_task_mgt_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_tm_rsp * hdr)3312 iscsit_build_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3313 struct iscsi_tm_rsp *hdr)
3314 {
3315 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3316
3317 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3318 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3319 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3320 hdr->itt = cmd->init_task_tag;
3321 cmd->stat_sn = conn->stat_sn++;
3322 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3323
3324 iscsit_increment_maxcmdsn(cmd, conn->sess);
3325 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3326 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3327
3328 pr_debug("Built Task Management Response ITT: 0x%08x,"
3329 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3330 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3331 }
3332 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3333
3334 static int
iscsit_send_task_mgt_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3335 iscsit_send_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3336 {
3337 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3338
3339 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3340
3341 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3342 }
3343
3344 #define SENDTARGETS_BUF_LIMIT 32768U
3345
3346 static int
iscsit_build_sendtargets_response(struct iscsit_cmd * cmd,enum iscsit_transport_type network_transport,int skip_bytes,bool * completed)3347 iscsit_build_sendtargets_response(struct iscsit_cmd *cmd,
3348 enum iscsit_transport_type network_transport,
3349 int skip_bytes, bool *completed)
3350 {
3351 char *payload = NULL;
3352 struct iscsit_conn *conn = cmd->conn;
3353 struct iscsi_portal_group *tpg;
3354 struct iscsi_tiqn *tiqn;
3355 struct iscsi_tpg_np *tpg_np;
3356 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3357 int target_name_printed;
3358 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3359 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3360 bool active;
3361
3362 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3363 SENDTARGETS_BUF_LIMIT);
3364
3365 payload = kzalloc(buffer_len, GFP_KERNEL);
3366 if (!payload)
3367 return -ENOMEM;
3368
3369 /*
3370 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3371 * explicit case..
3372 */
3373 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3374 text_ptr = strchr(text_in, '=');
3375 if (!text_ptr) {
3376 pr_err("Unable to locate '=' string in text_in:"
3377 " %s\n", text_in);
3378 kfree(payload);
3379 return -EINVAL;
3380 }
3381 /*
3382 * Skip over '=' character..
3383 */
3384 text_ptr += 1;
3385 }
3386
3387 spin_lock(&tiqn_lock);
3388 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3389 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3390 strcmp(tiqn->tiqn, text_ptr)) {
3391 continue;
3392 }
3393
3394 target_name_printed = 0;
3395
3396 spin_lock(&tiqn->tiqn_tpg_lock);
3397 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3398
3399 /* If demo_mode_discovery=0 and generate_node_acls=0
3400 * (demo mode dislabed) do not return
3401 * TargetName+TargetAddress unless a NodeACL exists.
3402 */
3403
3404 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3405 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3406 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3407 cmd->conn->sess->sess_ops->InitiatorName))) {
3408 continue;
3409 }
3410
3411 spin_lock(&tpg->tpg_state_lock);
3412 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3413 spin_unlock(&tpg->tpg_state_lock);
3414
3415 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3416 continue;
3417
3418 spin_lock(&tpg->tpg_np_lock);
3419 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3420 tpg_np_list) {
3421 struct iscsi_np *np = tpg_np->tpg_np;
3422 struct sockaddr_storage *sockaddr;
3423
3424 if (np->np_network_transport != network_transport)
3425 continue;
3426
3427 if (!target_name_printed) {
3428 len = sprintf(buf, "TargetName=%s",
3429 tiqn->tiqn);
3430 len += 1;
3431
3432 if ((len + payload_len) > buffer_len) {
3433 spin_unlock(&tpg->tpg_np_lock);
3434 spin_unlock(&tiqn->tiqn_tpg_lock);
3435 end_of_buf = 1;
3436 goto eob;
3437 }
3438
3439 if (skip_bytes && len <= skip_bytes) {
3440 skip_bytes -= len;
3441 } else {
3442 memcpy(payload + payload_len, buf, len);
3443 payload_len += len;
3444 target_name_printed = 1;
3445 if (len > skip_bytes)
3446 skip_bytes = 0;
3447 }
3448 }
3449
3450 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3451 sockaddr = &conn->local_sockaddr;
3452 else
3453 sockaddr = &np->np_sockaddr;
3454
3455 len = sprintf(buf, "TargetAddress="
3456 "%pISpc,%hu",
3457 sockaddr,
3458 tpg->tpgt);
3459 len += 1;
3460
3461 if ((len + payload_len) > buffer_len) {
3462 spin_unlock(&tpg->tpg_np_lock);
3463 spin_unlock(&tiqn->tiqn_tpg_lock);
3464 end_of_buf = 1;
3465 goto eob;
3466 }
3467
3468 if (skip_bytes && len <= skip_bytes) {
3469 skip_bytes -= len;
3470 } else {
3471 memcpy(payload + payload_len, buf, len);
3472 payload_len += len;
3473 if (len > skip_bytes)
3474 skip_bytes = 0;
3475 }
3476 }
3477 spin_unlock(&tpg->tpg_np_lock);
3478 }
3479 spin_unlock(&tiqn->tiqn_tpg_lock);
3480 eob:
3481 if (end_of_buf) {
3482 *completed = false;
3483 break;
3484 }
3485
3486 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3487 break;
3488 }
3489 spin_unlock(&tiqn_lock);
3490
3491 cmd->buf_ptr = payload;
3492
3493 return payload_len;
3494 }
3495
3496 int
iscsit_build_text_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_text_rsp * hdr,enum iscsit_transport_type network_transport)3497 iscsit_build_text_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3498 struct iscsi_text_rsp *hdr,
3499 enum iscsit_transport_type network_transport)
3500 {
3501 int text_length, padding;
3502 bool completed = true;
3503
3504 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3505 cmd->read_data_done,
3506 &completed);
3507 if (text_length < 0)
3508 return text_length;
3509
3510 if (completed) {
3511 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3512 } else {
3513 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3514 cmd->read_data_done += text_length;
3515 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3516 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3517 }
3518 hdr->opcode = ISCSI_OP_TEXT_RSP;
3519 padding = ((-text_length) & 3);
3520 hton24(hdr->dlength, text_length);
3521 hdr->itt = cmd->init_task_tag;
3522 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3523 cmd->stat_sn = conn->stat_sn++;
3524 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3525
3526 iscsit_increment_maxcmdsn(cmd, conn->sess);
3527 /*
3528 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3529 * correctly increment MaxCmdSN for each response answering a
3530 * non immediate text request with a valid CmdSN.
3531 */
3532 cmd->maxcmdsn_inc = 0;
3533 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3534 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3535
3536 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3537 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3538 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3539 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3540 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3541
3542 return text_length + padding;
3543 }
3544 EXPORT_SYMBOL(iscsit_build_text_rsp);
3545
iscsit_send_text_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3546 static int iscsit_send_text_rsp(
3547 struct iscsit_cmd *cmd,
3548 struct iscsit_conn *conn)
3549 {
3550 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3551 int text_length;
3552
3553 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3554 conn->conn_transport->transport_type);
3555 if (text_length < 0)
3556 return text_length;
3557
3558 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3559 cmd->buf_ptr,
3560 text_length);
3561 }
3562
3563 void
iscsit_build_reject(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_reject * hdr)3564 iscsit_build_reject(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3565 struct iscsi_reject *hdr)
3566 {
3567 hdr->opcode = ISCSI_OP_REJECT;
3568 hdr->reason = cmd->reject_reason;
3569 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3570 hton24(hdr->dlength, ISCSI_HDR_LEN);
3571 hdr->ffffffff = cpu_to_be32(0xffffffff);
3572 cmd->stat_sn = conn->stat_sn++;
3573 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3574 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3575 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3576
3577 }
3578 EXPORT_SYMBOL(iscsit_build_reject);
3579
iscsit_send_reject(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3580 static int iscsit_send_reject(
3581 struct iscsit_cmd *cmd,
3582 struct iscsit_conn *conn)
3583 {
3584 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3585
3586 iscsit_build_reject(cmd, conn, hdr);
3587
3588 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3589 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3590
3591 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3592 cmd->buf_ptr,
3593 ISCSI_HDR_LEN);
3594 }
3595
iscsit_thread_get_cpumask(struct iscsit_conn * conn)3596 void iscsit_thread_get_cpumask(struct iscsit_conn *conn)
3597 {
3598 int ord, cpu;
3599 cpumask_var_t conn_allowed_cpumask;
3600
3601 /*
3602 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3603 * within iscsit_start_kthreads()
3604 *
3605 * Here we use bitmap_id to determine which CPU that this
3606 * iSCSI connection's RX/TX threads will be scheduled to
3607 * execute upon.
3608 */
3609 if (!zalloc_cpumask_var(&conn_allowed_cpumask, GFP_KERNEL)) {
3610 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3611 for_each_online_cpu(cpu) {
3612 if (ord-- == 0) {
3613 cpumask_set_cpu(cpu, conn->conn_cpumask);
3614 return;
3615 }
3616 }
3617 } else {
3618 cpumask_and(conn_allowed_cpumask, iscsit_global->allowed_cpumask,
3619 cpu_online_mask);
3620
3621 cpumask_clear(conn->conn_cpumask);
3622 ord = conn->bitmap_id % cpumask_weight(conn_allowed_cpumask);
3623 for_each_cpu(cpu, conn_allowed_cpumask) {
3624 if (ord-- == 0) {
3625 cpumask_set_cpu(cpu, conn->conn_cpumask);
3626 free_cpumask_var(conn_allowed_cpumask);
3627 return;
3628 }
3629 }
3630 free_cpumask_var(conn_allowed_cpumask);
3631 }
3632 /*
3633 * This should never be reached..
3634 */
3635 dump_stack();
3636 cpumask_setall(conn->conn_cpumask);
3637 }
3638
iscsit_thread_reschedule(struct iscsit_conn * conn)3639 static void iscsit_thread_reschedule(struct iscsit_conn *conn)
3640 {
3641 /*
3642 * If iscsit_global->allowed_cpumask modified, reschedule iSCSI
3643 * connection's RX/TX threads update conn->allowed_cpumask.
3644 */
3645 if (!cpumask_equal(iscsit_global->allowed_cpumask,
3646 conn->allowed_cpumask)) {
3647 iscsit_thread_get_cpumask(conn);
3648 conn->conn_tx_reset_cpumask = 1;
3649 conn->conn_rx_reset_cpumask = 1;
3650 cpumask_copy(conn->allowed_cpumask,
3651 iscsit_global->allowed_cpumask);
3652 }
3653 }
3654
iscsit_thread_check_cpumask(struct iscsit_conn * conn,struct task_struct * p,int mode)3655 void iscsit_thread_check_cpumask(
3656 struct iscsit_conn *conn,
3657 struct task_struct *p,
3658 int mode)
3659 {
3660 /*
3661 * The TX and RX threads maybe call iscsit_thread_check_cpumask()
3662 * at the same time. The RX thread might be faster and return from
3663 * iscsit_thread_reschedule() with conn_rx_reset_cpumask set to 0.
3664 * Then the TX thread sets it back to 1.
3665 * The next time the RX thread loops, it sees conn_rx_reset_cpumask
3666 * set to 1 and calls set_cpus_allowed_ptr() again and set it to 0.
3667 */
3668 iscsit_thread_reschedule(conn);
3669
3670 /*
3671 * mode == 1 signals iscsi_target_tx_thread() usage.
3672 * mode == 0 signals iscsi_target_rx_thread() usage.
3673 */
3674 if (mode == 1) {
3675 if (!conn->conn_tx_reset_cpumask)
3676 return;
3677 } else {
3678 if (!conn->conn_rx_reset_cpumask)
3679 return;
3680 }
3681
3682 /*
3683 * Update the CPU mask for this single kthread so that
3684 * both TX and RX kthreads are scheduled to run on the
3685 * same CPU.
3686 */
3687 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3688 if (mode == 1)
3689 conn->conn_tx_reset_cpumask = 0;
3690 else
3691 conn->conn_rx_reset_cpumask = 0;
3692 }
3693 EXPORT_SYMBOL(iscsit_thread_check_cpumask);
3694
3695 int
iscsit_immediate_queue(struct iscsit_conn * conn,struct iscsit_cmd * cmd,int state)3696 iscsit_immediate_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
3697 {
3698 int ret;
3699
3700 switch (state) {
3701 case ISTATE_SEND_R2T:
3702 ret = iscsit_send_r2t(cmd, conn);
3703 if (ret < 0)
3704 goto err;
3705 break;
3706 case ISTATE_REMOVE:
3707 spin_lock_bh(&conn->cmd_lock);
3708 list_del_init(&cmd->i_conn_node);
3709 spin_unlock_bh(&conn->cmd_lock);
3710
3711 iscsit_free_cmd(cmd, false);
3712 break;
3713 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3714 iscsit_mod_nopin_response_timer(conn);
3715 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3716 if (ret < 0)
3717 goto err;
3718 break;
3719 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3720 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3721 if (ret < 0)
3722 goto err;
3723 break;
3724 default:
3725 pr_err("Unknown Opcode: 0x%02x ITT:"
3726 " 0x%08x, i_state: %d on CID: %hu\n",
3727 cmd->iscsi_opcode, cmd->init_task_tag, state,
3728 conn->cid);
3729 goto err;
3730 }
3731
3732 return 0;
3733
3734 err:
3735 return -1;
3736 }
3737 EXPORT_SYMBOL(iscsit_immediate_queue);
3738
3739 static int
iscsit_handle_immediate_queue(struct iscsit_conn * conn)3740 iscsit_handle_immediate_queue(struct iscsit_conn *conn)
3741 {
3742 struct iscsit_transport *t = conn->conn_transport;
3743 struct iscsi_queue_req *qr;
3744 struct iscsit_cmd *cmd;
3745 u8 state;
3746 int ret;
3747
3748 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3749 atomic_set(&conn->check_immediate_queue, 0);
3750 cmd = qr->cmd;
3751 state = qr->state;
3752 kmem_cache_free(lio_qr_cache, qr);
3753
3754 ret = t->iscsit_immediate_queue(conn, cmd, state);
3755 if (ret < 0)
3756 return ret;
3757 }
3758
3759 return 0;
3760 }
3761
3762 int
iscsit_response_queue(struct iscsit_conn * conn,struct iscsit_cmd * cmd,int state)3763 iscsit_response_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
3764 {
3765 int ret;
3766
3767 check_rsp_state:
3768 switch (state) {
3769 case ISTATE_SEND_DATAIN:
3770 ret = iscsit_send_datain(cmd, conn);
3771 if (ret < 0)
3772 goto err;
3773 else if (!ret)
3774 /* more drs */
3775 goto check_rsp_state;
3776 else if (ret == 1) {
3777 /* all done */
3778 spin_lock_bh(&cmd->istate_lock);
3779 cmd->i_state = ISTATE_SENT_STATUS;
3780 spin_unlock_bh(&cmd->istate_lock);
3781
3782 if (atomic_read(&conn->check_immediate_queue))
3783 return 1;
3784
3785 return 0;
3786 } else if (ret == 2) {
3787 /* Still must send status,
3788 SCF_TRANSPORT_TASK_SENSE was set */
3789 spin_lock_bh(&cmd->istate_lock);
3790 cmd->i_state = ISTATE_SEND_STATUS;
3791 spin_unlock_bh(&cmd->istate_lock);
3792 state = ISTATE_SEND_STATUS;
3793 goto check_rsp_state;
3794 }
3795
3796 break;
3797 case ISTATE_SEND_STATUS:
3798 case ISTATE_SEND_STATUS_RECOVERY:
3799 ret = iscsit_send_response(cmd, conn);
3800 break;
3801 case ISTATE_SEND_LOGOUTRSP:
3802 ret = iscsit_send_logout(cmd, conn);
3803 break;
3804 case ISTATE_SEND_ASYNCMSG:
3805 ret = iscsit_send_conn_drop_async_message(
3806 cmd, conn);
3807 break;
3808 case ISTATE_SEND_NOPIN:
3809 ret = iscsit_send_nopin(cmd, conn);
3810 break;
3811 case ISTATE_SEND_REJECT:
3812 ret = iscsit_send_reject(cmd, conn);
3813 break;
3814 case ISTATE_SEND_TASKMGTRSP:
3815 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3816 if (ret != 0)
3817 break;
3818 ret = iscsit_tmr_post_handler(cmd, conn);
3819 if (ret != 0)
3820 iscsit_fall_back_to_erl0(conn->sess);
3821 break;
3822 case ISTATE_SEND_TEXTRSP:
3823 ret = iscsit_send_text_rsp(cmd, conn);
3824 break;
3825 default:
3826 pr_err("Unknown Opcode: 0x%02x ITT:"
3827 " 0x%08x, i_state: %d on CID: %hu\n",
3828 cmd->iscsi_opcode, cmd->init_task_tag,
3829 state, conn->cid);
3830 goto err;
3831 }
3832 if (ret < 0)
3833 goto err;
3834
3835 switch (state) {
3836 case ISTATE_SEND_LOGOUTRSP:
3837 if (!iscsit_logout_post_handler(cmd, conn))
3838 return -ECONNRESET;
3839 fallthrough;
3840 case ISTATE_SEND_STATUS:
3841 case ISTATE_SEND_ASYNCMSG:
3842 case ISTATE_SEND_NOPIN:
3843 case ISTATE_SEND_STATUS_RECOVERY:
3844 case ISTATE_SEND_TEXTRSP:
3845 case ISTATE_SEND_TASKMGTRSP:
3846 case ISTATE_SEND_REJECT:
3847 spin_lock_bh(&cmd->istate_lock);
3848 cmd->i_state = ISTATE_SENT_STATUS;
3849 spin_unlock_bh(&cmd->istate_lock);
3850 break;
3851 default:
3852 pr_err("Unknown Opcode: 0x%02x ITT:"
3853 " 0x%08x, i_state: %d on CID: %hu\n",
3854 cmd->iscsi_opcode, cmd->init_task_tag,
3855 cmd->i_state, conn->cid);
3856 goto err;
3857 }
3858
3859 if (atomic_read(&conn->check_immediate_queue))
3860 return 1;
3861
3862 return 0;
3863
3864 err:
3865 return -1;
3866 }
3867 EXPORT_SYMBOL(iscsit_response_queue);
3868
iscsit_handle_response_queue(struct iscsit_conn * conn)3869 static int iscsit_handle_response_queue(struct iscsit_conn *conn)
3870 {
3871 struct iscsit_transport *t = conn->conn_transport;
3872 struct iscsi_queue_req *qr;
3873 struct iscsit_cmd *cmd;
3874 u8 state;
3875 int ret;
3876
3877 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3878 cmd = qr->cmd;
3879 state = qr->state;
3880 kmem_cache_free(lio_qr_cache, qr);
3881
3882 ret = t->iscsit_response_queue(conn, cmd, state);
3883 if (ret == 1 || ret < 0)
3884 return ret;
3885 }
3886
3887 return 0;
3888 }
3889
iscsi_target_tx_thread(void * arg)3890 int iscsi_target_tx_thread(void *arg)
3891 {
3892 int ret = 0;
3893 struct iscsit_conn *conn = arg;
3894 bool conn_freed = false;
3895
3896 /*
3897 * Allow ourselves to be interrupted by SIGINT so that a
3898 * connection recovery / failure event can be triggered externally.
3899 */
3900 allow_signal(SIGINT);
3901
3902 while (!kthread_should_stop()) {
3903 /*
3904 * Ensure that both TX and RX per connection kthreads
3905 * are scheduled to run on the same CPU.
3906 */
3907 iscsit_thread_check_cpumask(conn, current, 1);
3908
3909 wait_event_interruptible(conn->queues_wq,
3910 !iscsit_conn_all_queues_empty(conn));
3911
3912 if (signal_pending(current))
3913 goto transport_err;
3914
3915 get_immediate:
3916 ret = iscsit_handle_immediate_queue(conn);
3917 if (ret < 0)
3918 goto transport_err;
3919
3920 ret = iscsit_handle_response_queue(conn);
3921 if (ret == 1) {
3922 goto get_immediate;
3923 } else if (ret == -ECONNRESET) {
3924 conn_freed = true;
3925 goto out;
3926 } else if (ret < 0) {
3927 goto transport_err;
3928 }
3929 }
3930
3931 transport_err:
3932 /*
3933 * Avoid the normal connection failure code-path if this connection
3934 * is still within LOGIN mode, and iscsi_np process context is
3935 * responsible for cleaning up the early connection failure.
3936 */
3937 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3938 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3939 out:
3940 if (!conn_freed) {
3941 while (!kthread_should_stop()) {
3942 msleep(100);
3943 }
3944 }
3945 return 0;
3946 }
3947
iscsi_target_rx_opcode(struct iscsit_conn * conn,unsigned char * buf)3948 static int iscsi_target_rx_opcode(struct iscsit_conn *conn, unsigned char *buf)
3949 {
3950 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3951 struct iscsit_cmd *cmd;
3952 int ret = 0;
3953
3954 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3955 case ISCSI_OP_SCSI_CMD:
3956 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3957 if (!cmd)
3958 goto reject;
3959
3960 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3961 break;
3962 case ISCSI_OP_SCSI_DATA_OUT:
3963 ret = iscsit_handle_data_out(conn, buf);
3964 break;
3965 case ISCSI_OP_NOOP_OUT:
3966 cmd = NULL;
3967 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3968 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3969 if (!cmd)
3970 goto reject;
3971 }
3972 ret = iscsit_handle_nop_out(conn, cmd, buf);
3973 break;
3974 case ISCSI_OP_SCSI_TMFUNC:
3975 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3976 if (!cmd)
3977 goto reject;
3978
3979 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3980 break;
3981 case ISCSI_OP_TEXT:
3982 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3983 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3984 if (!cmd)
3985 goto reject;
3986 } else {
3987 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3988 if (!cmd)
3989 goto reject;
3990 }
3991
3992 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3993 break;
3994 case ISCSI_OP_LOGOUT:
3995 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3996 if (!cmd)
3997 goto reject;
3998
3999 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4000 if (ret > 0)
4001 wait_for_completion_timeout(&conn->conn_logout_comp,
4002 SECONDS_FOR_LOGOUT_COMP * HZ);
4003 break;
4004 case ISCSI_OP_SNACK:
4005 ret = iscsit_handle_snack(conn, buf);
4006 break;
4007 default:
4008 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4009 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4010 pr_err("Cannot recover from unknown"
4011 " opcode while ERL=0, closing iSCSI connection.\n");
4012 return -1;
4013 }
4014 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
4015 " closing iSCSI connection.\n");
4016 ret = -1;
4017 break;
4018 }
4019
4020 return ret;
4021 reject:
4022 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4023 }
4024
iscsi_target_check_conn_state(struct iscsit_conn * conn)4025 static bool iscsi_target_check_conn_state(struct iscsit_conn *conn)
4026 {
4027 bool ret;
4028
4029 spin_lock_bh(&conn->state_lock);
4030 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
4031 spin_unlock_bh(&conn->state_lock);
4032
4033 return ret;
4034 }
4035
iscsit_get_rx_pdu(struct iscsit_conn * conn)4036 static void iscsit_get_rx_pdu(struct iscsit_conn *conn)
4037 {
4038 int ret;
4039 u8 *buffer, opcode;
4040 u32 checksum = 0, digest = 0;
4041 struct kvec iov;
4042
4043 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
4044 if (!buffer)
4045 return;
4046
4047 while (!kthread_should_stop()) {
4048 /*
4049 * Ensure that both TX and RX per connection kthreads
4050 * are scheduled to run on the same CPU.
4051 */
4052 iscsit_thread_check_cpumask(conn, current, 0);
4053
4054 memset(&iov, 0, sizeof(struct kvec));
4055
4056 iov.iov_base = buffer;
4057 iov.iov_len = ISCSI_HDR_LEN;
4058
4059 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4060 if (ret != ISCSI_HDR_LEN) {
4061 iscsit_rx_thread_wait_for_tcp(conn);
4062 break;
4063 }
4064
4065 if (conn->conn_ops->HeaderDigest) {
4066 iov.iov_base = &digest;
4067 iov.iov_len = ISCSI_CRC_LEN;
4068
4069 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4070 if (ret != ISCSI_CRC_LEN) {
4071 iscsit_rx_thread_wait_for_tcp(conn);
4072 break;
4073 }
4074
4075 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
4076 ISCSI_HDR_LEN, 0, NULL,
4077 &checksum);
4078
4079 if (digest != checksum) {
4080 pr_err("HeaderDigest CRC32C failed,"
4081 " received 0x%08x, computed 0x%08x\n",
4082 digest, checksum);
4083 /*
4084 * Set the PDU to 0xff so it will intentionally
4085 * hit default in the switch below.
4086 */
4087 memset(buffer, 0xff, ISCSI_HDR_LEN);
4088 atomic_long_inc(&conn->sess->conn_digest_errors);
4089 } else {
4090 pr_debug("Got HeaderDigest CRC32C"
4091 " 0x%08x\n", checksum);
4092 }
4093 }
4094
4095 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4096 break;
4097
4098 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4099
4100 if (conn->sess->sess_ops->SessionType &&
4101 ((!(opcode & ISCSI_OP_TEXT)) ||
4102 (!(opcode & ISCSI_OP_LOGOUT)))) {
4103 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4104 " while in Discovery Session, rejecting.\n", opcode);
4105 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4106 buffer);
4107 break;
4108 }
4109
4110 ret = iscsi_target_rx_opcode(conn, buffer);
4111 if (ret < 0)
4112 break;
4113 }
4114
4115 kfree(buffer);
4116 }
4117
iscsi_target_rx_thread(void * arg)4118 int iscsi_target_rx_thread(void *arg)
4119 {
4120 int rc;
4121 struct iscsit_conn *conn = arg;
4122 bool conn_freed = false;
4123
4124 /*
4125 * Allow ourselves to be interrupted by SIGINT so that a
4126 * connection recovery / failure event can be triggered externally.
4127 */
4128 allow_signal(SIGINT);
4129 /*
4130 * Wait for iscsi_post_login_handler() to complete before allowing
4131 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4132 */
4133 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4134 if (rc < 0 || iscsi_target_check_conn_state(conn))
4135 goto out;
4136
4137 if (!conn->conn_transport->iscsit_get_rx_pdu)
4138 return 0;
4139
4140 conn->conn_transport->iscsit_get_rx_pdu(conn);
4141
4142 if (!signal_pending(current))
4143 atomic_set(&conn->transport_failed, 1);
4144 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4145
4146 out:
4147 if (!conn_freed) {
4148 while (!kthread_should_stop()) {
4149 msleep(100);
4150 }
4151 }
4152
4153 return 0;
4154 }
4155
iscsit_release_commands_from_conn(struct iscsit_conn * conn)4156 static void iscsit_release_commands_from_conn(struct iscsit_conn *conn)
4157 {
4158 LIST_HEAD(tmp_list);
4159 struct iscsit_cmd *cmd = NULL, *cmd_tmp = NULL;
4160 struct iscsit_session *sess = conn->sess;
4161 /*
4162 * We expect this function to only ever be called from either RX or TX
4163 * thread context via iscsit_close_connection() once the other context
4164 * has been reset -> returned sleeping pre-handler state.
4165 */
4166 spin_lock_bh(&conn->cmd_lock);
4167 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4168
4169 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4170 struct se_cmd *se_cmd = &cmd->se_cmd;
4171
4172 if (se_cmd->se_tfo != NULL) {
4173 spin_lock_irq(&se_cmd->t_state_lock);
4174 if (se_cmd->transport_state & CMD_T_ABORTED) {
4175 /*
4176 * LIO's abort path owns the cleanup for this,
4177 * so put it back on the list and let
4178 * aborted_task handle it.
4179 */
4180 list_move_tail(&cmd->i_conn_node,
4181 &conn->conn_cmd_list);
4182 } else {
4183 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4184 }
4185 spin_unlock_irq(&se_cmd->t_state_lock);
4186 }
4187 }
4188 spin_unlock_bh(&conn->cmd_lock);
4189
4190 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4191 list_del_init(&cmd->i_conn_node);
4192
4193 iscsit_increment_maxcmdsn(cmd, sess);
4194 iscsit_free_cmd(cmd, true);
4195
4196 }
4197 }
4198
iscsit_stop_timers_for_cmds(struct iscsit_conn * conn)4199 static void iscsit_stop_timers_for_cmds(
4200 struct iscsit_conn *conn)
4201 {
4202 struct iscsit_cmd *cmd;
4203
4204 spin_lock_bh(&conn->cmd_lock);
4205 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4206 if (cmd->data_direction == DMA_TO_DEVICE)
4207 iscsit_stop_dataout_timer(cmd);
4208 }
4209 spin_unlock_bh(&conn->cmd_lock);
4210 }
4211
iscsit_close_connection(struct iscsit_conn * conn)4212 int iscsit_close_connection(
4213 struct iscsit_conn *conn)
4214 {
4215 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4216 struct iscsit_session *sess = conn->sess;
4217
4218 pr_debug("Closing iSCSI connection CID %hu on SID:"
4219 " %u\n", conn->cid, sess->sid);
4220 /*
4221 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4222 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4223 * sleeping and the logout response never got sent because the
4224 * connection failed.
4225 *
4226 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4227 * to signal logout response TX interrupt completion. Go ahead and skip
4228 * this for iser since isert_rx_opcode() does not wait on logout failure,
4229 * and to avoid iscsit_conn pointer dereference in iser-target code.
4230 */
4231 if (!conn->conn_transport->rdma_shutdown)
4232 complete(&conn->conn_logout_comp);
4233
4234 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4235 if (conn->tx_thread &&
4236 cmpxchg(&conn->tx_thread_active, true, false)) {
4237 send_sig(SIGINT, conn->tx_thread, 1);
4238 kthread_stop(conn->tx_thread);
4239 }
4240 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4241 if (conn->rx_thread &&
4242 cmpxchg(&conn->rx_thread_active, true, false)) {
4243 send_sig(SIGINT, conn->rx_thread, 1);
4244 kthread_stop(conn->rx_thread);
4245 }
4246 }
4247
4248 spin_lock(&iscsit_global->ts_bitmap_lock);
4249 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4250 get_order(1));
4251 spin_unlock(&iscsit_global->ts_bitmap_lock);
4252
4253 iscsit_stop_timers_for_cmds(conn);
4254 iscsit_stop_nopin_response_timer(conn);
4255 iscsit_stop_nopin_timer(conn);
4256
4257 if (conn->conn_transport->iscsit_wait_conn)
4258 conn->conn_transport->iscsit_wait_conn(conn);
4259
4260 /*
4261 * During Connection recovery drop unacknowledged out of order
4262 * commands for this connection, and prepare the other commands
4263 * for reallegiance.
4264 *
4265 * During normal operation clear the out of order commands (but
4266 * do not free the struct iscsi_ooo_cmdsn's) and release all
4267 * struct iscsit_cmds.
4268 */
4269 if (atomic_read(&conn->connection_recovery)) {
4270 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4271 iscsit_prepare_cmds_for_reallegiance(conn);
4272 } else {
4273 iscsit_clear_ooo_cmdsns_for_conn(conn);
4274 iscsit_release_commands_from_conn(conn);
4275 }
4276 iscsit_free_queue_reqs_for_conn(conn);
4277
4278 /*
4279 * Handle decrementing session or connection usage count if
4280 * a logout response was not able to be sent because the
4281 * connection failed. Fall back to Session Recovery here.
4282 */
4283 if (atomic_read(&conn->conn_logout_remove)) {
4284 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4285 iscsit_dec_conn_usage_count(conn);
4286 iscsit_dec_session_usage_count(sess);
4287 }
4288 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4289 iscsit_dec_conn_usage_count(conn);
4290
4291 atomic_set(&conn->conn_logout_remove, 0);
4292 atomic_set(&sess->session_reinstatement, 0);
4293 atomic_set(&sess->session_fall_back_to_erl0, 1);
4294 }
4295
4296 spin_lock_bh(&sess->conn_lock);
4297 list_del(&conn->conn_list);
4298
4299 /*
4300 * Attempt to let the Initiator know this connection failed by
4301 * sending an Connection Dropped Async Message on another
4302 * active connection.
4303 */
4304 if (atomic_read(&conn->connection_recovery))
4305 iscsit_build_conn_drop_async_message(conn);
4306
4307 spin_unlock_bh(&sess->conn_lock);
4308
4309 /*
4310 * If connection reinstatement is being performed on this connection,
4311 * up the connection reinstatement semaphore that is being blocked on
4312 * in iscsit_cause_connection_reinstatement().
4313 */
4314 spin_lock_bh(&conn->state_lock);
4315 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4316 spin_unlock_bh(&conn->state_lock);
4317 complete(&conn->conn_wait_comp);
4318 wait_for_completion(&conn->conn_post_wait_comp);
4319 spin_lock_bh(&conn->state_lock);
4320 }
4321
4322 /*
4323 * If connection reinstatement is being performed on this connection
4324 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4325 * connection wait rcfr semaphore that is being blocked on
4326 * an iscsit_connection_reinstatement_rcfr().
4327 */
4328 if (atomic_read(&conn->connection_wait_rcfr)) {
4329 spin_unlock_bh(&conn->state_lock);
4330 complete(&conn->conn_wait_rcfr_comp);
4331 wait_for_completion(&conn->conn_post_wait_comp);
4332 spin_lock_bh(&conn->state_lock);
4333 }
4334 atomic_set(&conn->connection_reinstatement, 1);
4335 spin_unlock_bh(&conn->state_lock);
4336
4337 /*
4338 * If any other processes are accessing this connection pointer we
4339 * must wait until they have completed.
4340 */
4341 iscsit_check_conn_usage_count(conn);
4342
4343 ahash_request_free(conn->conn_tx_hash);
4344 if (conn->conn_rx_hash) {
4345 struct crypto_ahash *tfm;
4346
4347 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4348 ahash_request_free(conn->conn_rx_hash);
4349 crypto_free_ahash(tfm);
4350 }
4351
4352 if (conn->sock)
4353 sock_release(conn->sock);
4354
4355 if (conn->conn_transport->iscsit_free_conn)
4356 conn->conn_transport->iscsit_free_conn(conn);
4357
4358 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4359 conn->conn_state = TARG_CONN_STATE_FREE;
4360 iscsit_free_conn(conn);
4361
4362 spin_lock_bh(&sess->conn_lock);
4363 atomic_dec(&sess->nconn);
4364 pr_debug("Decremented iSCSI connection count to %hu from node:"
4365 " %s\n", atomic_read(&sess->nconn),
4366 sess->sess_ops->InitiatorName);
4367 /*
4368 * Make sure that if one connection fails in an non ERL=2 iSCSI
4369 * Session that they all fail.
4370 */
4371 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4372 !atomic_read(&sess->session_logout))
4373 atomic_set(&sess->session_fall_back_to_erl0, 1);
4374
4375 /*
4376 * If this was not the last connection in the session, and we are
4377 * performing session reinstatement or falling back to ERL=0, call
4378 * iscsit_stop_session() without sleeping to shutdown the other
4379 * active connections.
4380 */
4381 if (atomic_read(&sess->nconn)) {
4382 if (!atomic_read(&sess->session_reinstatement) &&
4383 !atomic_read(&sess->session_fall_back_to_erl0)) {
4384 spin_unlock_bh(&sess->conn_lock);
4385 return 0;
4386 }
4387 if (!atomic_read(&sess->session_stop_active)) {
4388 atomic_set(&sess->session_stop_active, 1);
4389 spin_unlock_bh(&sess->conn_lock);
4390 iscsit_stop_session(sess, 0, 0);
4391 return 0;
4392 }
4393 spin_unlock_bh(&sess->conn_lock);
4394 return 0;
4395 }
4396
4397 /*
4398 * If this was the last connection in the session and one of the
4399 * following is occurring:
4400 *
4401 * Session Reinstatement is not being performed, and are falling back
4402 * to ERL=0 call iscsit_close_session().
4403 *
4404 * Session Logout was requested. iscsit_close_session() will be called
4405 * elsewhere.
4406 *
4407 * Session Continuation is not being performed, start the Time2Retain
4408 * handler and check if sleep_on_sess_wait_sem is active.
4409 */
4410 if (!atomic_read(&sess->session_reinstatement) &&
4411 atomic_read(&sess->session_fall_back_to_erl0)) {
4412 spin_unlock_bh(&sess->conn_lock);
4413 complete_all(&sess->session_wait_comp);
4414 iscsit_close_session(sess, true);
4415
4416 return 0;
4417 } else if (atomic_read(&sess->session_logout)) {
4418 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4419 sess->session_state = TARG_SESS_STATE_FREE;
4420
4421 if (atomic_read(&sess->session_close)) {
4422 spin_unlock_bh(&sess->conn_lock);
4423 complete_all(&sess->session_wait_comp);
4424 iscsit_close_session(sess, true);
4425 } else {
4426 spin_unlock_bh(&sess->conn_lock);
4427 }
4428
4429 return 0;
4430 } else {
4431 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4432 sess->session_state = TARG_SESS_STATE_FAILED;
4433
4434 if (!atomic_read(&sess->session_continuation))
4435 iscsit_start_time2retain_handler(sess);
4436
4437 if (atomic_read(&sess->session_close)) {
4438 spin_unlock_bh(&sess->conn_lock);
4439 complete_all(&sess->session_wait_comp);
4440 iscsit_close_session(sess, true);
4441 } else {
4442 spin_unlock_bh(&sess->conn_lock);
4443 }
4444
4445 return 0;
4446 }
4447 }
4448
4449 /*
4450 * If the iSCSI Session for the iSCSI Initiator Node exists,
4451 * forcefully shutdown the iSCSI NEXUS.
4452 */
iscsit_close_session(struct iscsit_session * sess,bool can_sleep)4453 int iscsit_close_session(struct iscsit_session *sess, bool can_sleep)
4454 {
4455 struct iscsi_portal_group *tpg = sess->tpg;
4456 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4457
4458 if (atomic_read(&sess->nconn)) {
4459 pr_err("%d connection(s) still exist for iSCSI session"
4460 " to %s\n", atomic_read(&sess->nconn),
4461 sess->sess_ops->InitiatorName);
4462 BUG();
4463 }
4464
4465 spin_lock_bh(&se_tpg->session_lock);
4466 atomic_set(&sess->session_logout, 1);
4467 atomic_set(&sess->session_reinstatement, 1);
4468 iscsit_stop_time2retain_timer(sess);
4469 spin_unlock_bh(&se_tpg->session_lock);
4470
4471 /*
4472 * transport_deregister_session_configfs() will clear the
4473 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4474 * can be setting it again with __transport_register_session() in
4475 * iscsi_post_login_handler() again after the iscsit_stop_session()
4476 * completes in iscsi_np context.
4477 */
4478 transport_deregister_session_configfs(sess->se_sess);
4479
4480 /*
4481 * If any other processes are accessing this session pointer we must
4482 * wait until they have completed. If we are in an interrupt (the
4483 * time2retain handler) and contain and active session usage count we
4484 * restart the timer and exit.
4485 */
4486 if (iscsit_check_session_usage_count(sess, can_sleep)) {
4487 atomic_set(&sess->session_logout, 0);
4488 iscsit_start_time2retain_handler(sess);
4489 return 0;
4490 }
4491
4492 transport_deregister_session(sess->se_sess);
4493
4494 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4495 iscsit_free_connection_recovery_entries(sess);
4496
4497 iscsit_free_all_ooo_cmdsns(sess);
4498
4499 spin_lock_bh(&se_tpg->session_lock);
4500 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4501 sess->session_state = TARG_SESS_STATE_FREE;
4502 pr_debug("Released iSCSI session from node: %s\n",
4503 sess->sess_ops->InitiatorName);
4504 tpg->nsessions--;
4505 if (tpg->tpg_tiqn)
4506 tpg->tpg_tiqn->tiqn_nsessions--;
4507
4508 pr_debug("Decremented number of active iSCSI Sessions on"
4509 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4510
4511 ida_free(&sess_ida, sess->session_index);
4512 kfree(sess->sess_ops);
4513 sess->sess_ops = NULL;
4514 spin_unlock_bh(&se_tpg->session_lock);
4515
4516 kfree(sess);
4517 return 0;
4518 }
4519
iscsit_logout_post_handler_closesession(struct iscsit_conn * conn)4520 static void iscsit_logout_post_handler_closesession(
4521 struct iscsit_conn *conn)
4522 {
4523 struct iscsit_session *sess = conn->sess;
4524 int sleep = 1;
4525 /*
4526 * Traditional iscsi/tcp will invoke this logic from TX thread
4527 * context during session logout, so clear tx_thread_active and
4528 * sleep if iscsit_close_connection() has not already occured.
4529 *
4530 * Since iser-target invokes this logic from it's own workqueue,
4531 * always sleep waiting for RX/TX thread shutdown to complete
4532 * within iscsit_close_connection().
4533 */
4534 if (!conn->conn_transport->rdma_shutdown) {
4535 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4536 if (!sleep)
4537 return;
4538 }
4539
4540 atomic_set(&conn->conn_logout_remove, 0);
4541 complete(&conn->conn_logout_comp);
4542
4543 iscsit_dec_conn_usage_count(conn);
4544 atomic_set(&sess->session_close, 1);
4545 iscsit_stop_session(sess, sleep, sleep);
4546 iscsit_dec_session_usage_count(sess);
4547 }
4548
iscsit_logout_post_handler_samecid(struct iscsit_conn * conn)4549 static void iscsit_logout_post_handler_samecid(
4550 struct iscsit_conn *conn)
4551 {
4552 int sleep = 1;
4553
4554 if (!conn->conn_transport->rdma_shutdown) {
4555 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4556 if (!sleep)
4557 return;
4558 }
4559
4560 atomic_set(&conn->conn_logout_remove, 0);
4561 complete(&conn->conn_logout_comp);
4562
4563 iscsit_cause_connection_reinstatement(conn, sleep);
4564 iscsit_dec_conn_usage_count(conn);
4565 }
4566
iscsit_logout_post_handler_diffcid(struct iscsit_conn * conn,u16 cid)4567 static void iscsit_logout_post_handler_diffcid(
4568 struct iscsit_conn *conn,
4569 u16 cid)
4570 {
4571 struct iscsit_conn *l_conn;
4572 struct iscsit_session *sess = conn->sess;
4573 bool conn_found = false;
4574
4575 if (!sess)
4576 return;
4577
4578 spin_lock_bh(&sess->conn_lock);
4579 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4580 if (l_conn->cid == cid) {
4581 iscsit_inc_conn_usage_count(l_conn);
4582 conn_found = true;
4583 break;
4584 }
4585 }
4586 spin_unlock_bh(&sess->conn_lock);
4587
4588 if (!conn_found)
4589 return;
4590
4591 if (l_conn->sock)
4592 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4593
4594 spin_lock_bh(&l_conn->state_lock);
4595 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4596 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4597 spin_unlock_bh(&l_conn->state_lock);
4598
4599 iscsit_cause_connection_reinstatement(l_conn, 1);
4600 iscsit_dec_conn_usage_count(l_conn);
4601 }
4602
4603 /*
4604 * Return of 0 causes the TX thread to restart.
4605 */
iscsit_logout_post_handler(struct iscsit_cmd * cmd,struct iscsit_conn * conn)4606 int iscsit_logout_post_handler(
4607 struct iscsit_cmd *cmd,
4608 struct iscsit_conn *conn)
4609 {
4610 int ret = 0;
4611
4612 switch (cmd->logout_reason) {
4613 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4614 switch (cmd->logout_response) {
4615 case ISCSI_LOGOUT_SUCCESS:
4616 case ISCSI_LOGOUT_CLEANUP_FAILED:
4617 default:
4618 iscsit_logout_post_handler_closesession(conn);
4619 break;
4620 }
4621 break;
4622 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4623 if (conn->cid == cmd->logout_cid) {
4624 switch (cmd->logout_response) {
4625 case ISCSI_LOGOUT_SUCCESS:
4626 case ISCSI_LOGOUT_CLEANUP_FAILED:
4627 default:
4628 iscsit_logout_post_handler_samecid(conn);
4629 break;
4630 }
4631 } else {
4632 switch (cmd->logout_response) {
4633 case ISCSI_LOGOUT_SUCCESS:
4634 iscsit_logout_post_handler_diffcid(conn,
4635 cmd->logout_cid);
4636 break;
4637 case ISCSI_LOGOUT_CID_NOT_FOUND:
4638 case ISCSI_LOGOUT_CLEANUP_FAILED:
4639 default:
4640 break;
4641 }
4642 ret = 1;
4643 }
4644 break;
4645 case ISCSI_LOGOUT_REASON_RECOVERY:
4646 switch (cmd->logout_response) {
4647 case ISCSI_LOGOUT_SUCCESS:
4648 case ISCSI_LOGOUT_CID_NOT_FOUND:
4649 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4650 case ISCSI_LOGOUT_CLEANUP_FAILED:
4651 default:
4652 break;
4653 }
4654 ret = 1;
4655 break;
4656 default:
4657 break;
4658
4659 }
4660 return ret;
4661 }
4662 EXPORT_SYMBOL(iscsit_logout_post_handler);
4663
iscsit_fail_session(struct iscsit_session * sess)4664 void iscsit_fail_session(struct iscsit_session *sess)
4665 {
4666 struct iscsit_conn *conn;
4667
4668 spin_lock_bh(&sess->conn_lock);
4669 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4670 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4671 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4672 }
4673 spin_unlock_bh(&sess->conn_lock);
4674
4675 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4676 sess->session_state = TARG_SESS_STATE_FAILED;
4677 }
4678
iscsit_stop_session(struct iscsit_session * sess,int session_sleep,int connection_sleep)4679 void iscsit_stop_session(
4680 struct iscsit_session *sess,
4681 int session_sleep,
4682 int connection_sleep)
4683 {
4684 u16 conn_count = atomic_read(&sess->nconn);
4685 struct iscsit_conn *conn, *conn_tmp = NULL;
4686 int is_last;
4687
4688 spin_lock_bh(&sess->conn_lock);
4689
4690 if (connection_sleep) {
4691 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4692 conn_list) {
4693 if (conn_count == 0)
4694 break;
4695
4696 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4697 is_last = 1;
4698 } else {
4699 iscsit_inc_conn_usage_count(conn_tmp);
4700 is_last = 0;
4701 }
4702 iscsit_inc_conn_usage_count(conn);
4703
4704 spin_unlock_bh(&sess->conn_lock);
4705 iscsit_cause_connection_reinstatement(conn, 1);
4706 spin_lock_bh(&sess->conn_lock);
4707
4708 iscsit_dec_conn_usage_count(conn);
4709 if (is_last == 0)
4710 iscsit_dec_conn_usage_count(conn_tmp);
4711 conn_count--;
4712 }
4713 } else {
4714 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4715 iscsit_cause_connection_reinstatement(conn, 0);
4716 }
4717
4718 if (session_sleep && atomic_read(&sess->nconn)) {
4719 spin_unlock_bh(&sess->conn_lock);
4720 wait_for_completion(&sess->session_wait_comp);
4721 } else
4722 spin_unlock_bh(&sess->conn_lock);
4723 }
4724
iscsit_release_sessions_for_tpg(struct iscsi_portal_group * tpg,int force)4725 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4726 {
4727 struct iscsit_session *sess;
4728 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4729 struct se_session *se_sess, *se_sess_tmp;
4730 LIST_HEAD(free_list);
4731 int session_count = 0;
4732
4733 spin_lock_bh(&se_tpg->session_lock);
4734 if (tpg->nsessions && !force) {
4735 spin_unlock_bh(&se_tpg->session_lock);
4736 return -1;
4737 }
4738
4739 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4740 sess_list) {
4741 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr;
4742
4743 spin_lock(&sess->conn_lock);
4744 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4745 atomic_read(&sess->session_logout) ||
4746 atomic_read(&sess->session_close) ||
4747 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4748 spin_unlock(&sess->conn_lock);
4749 continue;
4750 }
4751 iscsit_inc_session_usage_count(sess);
4752 atomic_set(&sess->session_reinstatement, 1);
4753 atomic_set(&sess->session_fall_back_to_erl0, 1);
4754 atomic_set(&sess->session_close, 1);
4755 spin_unlock(&sess->conn_lock);
4756
4757 list_move_tail(&se_sess->sess_list, &free_list);
4758 }
4759 spin_unlock_bh(&se_tpg->session_lock);
4760
4761 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4762 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr;
4763
4764 list_del_init(&se_sess->sess_list);
4765 iscsit_stop_session(sess, 1, 1);
4766 iscsit_dec_session_usage_count(sess);
4767 session_count++;
4768 }
4769
4770 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4771 " Group: %hu\n", session_count, tpg->tpgt);
4772 return 0;
4773 }
4774
4775 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4776 MODULE_VERSION("4.1.x");
4777 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4778 MODULE_LICENSE("GPL");
4779
4780 module_init(iscsi_target_init_module);
4781 module_exit(iscsi_target_cleanup_module);
4782