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/target_core_backend.h>
30 #include <target/iscsi/iscsi_target_core.h>
31 #include "iscsi_target_parameters.h"
32 #include "iscsi_target_seq_pdu_list.h"
33 #include "iscsi_target_datain_values.h"
34 #include "iscsi_target_erl0.h"
35 #include "iscsi_target_erl1.h"
36 #include "iscsi_target_erl2.h"
37 #include "iscsi_target_login.h"
38 #include "iscsi_target_tmr.h"
39 #include "iscsi_target_tpg.h"
40 #include "iscsi_target_util.h"
41 #include "iscsi_target.h"
42 #include "iscsi_target_device.h"
43 #include <target/iscsi/iscsi_target_stat.h>
44
45 #include <target/iscsi/iscsi_transport.h>
46
47 static LIST_HEAD(g_tiqn_list);
48 static LIST_HEAD(g_np_list);
49 static DEFINE_SPINLOCK(tiqn_lock);
50 static DEFINE_MUTEX(np_lock);
51
52 static struct idr tiqn_idr;
53 DEFINE_IDA(sess_ida);
54 struct mutex auth_id_lock;
55
56 struct iscsit_global *iscsit_global;
57
58 struct kmem_cache *lio_qr_cache;
59 struct kmem_cache *lio_dr_cache;
60 struct kmem_cache *lio_ooo_cache;
61 struct kmem_cache *lio_r2t_cache;
62
63 static int iscsit_handle_immediate_data(struct iscsit_cmd *,
64 struct iscsi_scsi_req *, u32);
65
iscsit_get_tiqn_for_login(unsigned char * buf)66 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
67 {
68 struct iscsi_tiqn *tiqn = NULL;
69
70 spin_lock(&tiqn_lock);
71 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
72 if (!strcmp(tiqn->tiqn, buf)) {
73
74 spin_lock(&tiqn->tiqn_state_lock);
75 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
76 tiqn->tiqn_access_count++;
77 spin_unlock(&tiqn->tiqn_state_lock);
78 spin_unlock(&tiqn_lock);
79 return tiqn;
80 }
81 spin_unlock(&tiqn->tiqn_state_lock);
82 }
83 }
84 spin_unlock(&tiqn_lock);
85
86 return NULL;
87 }
88
iscsit_set_tiqn_shutdown(struct iscsi_tiqn * tiqn)89 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
90 {
91 spin_lock(&tiqn->tiqn_state_lock);
92 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
93 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
94 spin_unlock(&tiqn->tiqn_state_lock);
95 return 0;
96 }
97 spin_unlock(&tiqn->tiqn_state_lock);
98
99 return -1;
100 }
101
iscsit_put_tiqn_for_login(struct iscsi_tiqn * tiqn)102 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
103 {
104 spin_lock(&tiqn->tiqn_state_lock);
105 tiqn->tiqn_access_count--;
106 spin_unlock(&tiqn->tiqn_state_lock);
107 }
108
109 /*
110 * Note that IQN formatting is expected to be done in userspace, and
111 * no explict IQN format checks are done here.
112 */
iscsit_add_tiqn(unsigned char * buf)113 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
114 {
115 struct iscsi_tiqn *tiqn = NULL;
116 int ret;
117
118 if (strlen(buf) >= ISCSI_IQN_LEN) {
119 pr_err("Target IQN exceeds %d bytes\n",
120 ISCSI_IQN_LEN);
121 return ERR_PTR(-EINVAL);
122 }
123
124 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
125 if (!tiqn)
126 return ERR_PTR(-ENOMEM);
127
128 sprintf(tiqn->tiqn, "%s", buf);
129 INIT_LIST_HEAD(&tiqn->tiqn_list);
130 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
131 spin_lock_init(&tiqn->tiqn_state_lock);
132 spin_lock_init(&tiqn->tiqn_tpg_lock);
133 spin_lock_init(&tiqn->sess_err_stats.lock);
134 spin_lock_init(&tiqn->login_stats.lock);
135 spin_lock_init(&tiqn->logout_stats.lock);
136
137 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
138
139 idr_preload(GFP_KERNEL);
140 spin_lock(&tiqn_lock);
141
142 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
143 if (ret < 0) {
144 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
145 spin_unlock(&tiqn_lock);
146 idr_preload_end();
147 kfree(tiqn);
148 return ERR_PTR(ret);
149 }
150 tiqn->tiqn_index = ret;
151 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
152
153 spin_unlock(&tiqn_lock);
154 idr_preload_end();
155
156 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
157
158 return tiqn;
159
160 }
161
iscsit_wait_for_tiqn(struct iscsi_tiqn * tiqn)162 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
163 {
164 /*
165 * Wait for accesses to said struct iscsi_tiqn to end.
166 */
167 spin_lock(&tiqn->tiqn_state_lock);
168 while (tiqn->tiqn_access_count != 0) {
169 spin_unlock(&tiqn->tiqn_state_lock);
170 msleep(10);
171 spin_lock(&tiqn->tiqn_state_lock);
172 }
173 spin_unlock(&tiqn->tiqn_state_lock);
174 }
175
iscsit_del_tiqn(struct iscsi_tiqn * tiqn)176 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
177 {
178 /*
179 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
180 * while holding tiqn->tiqn_state_lock. This means that all subsequent
181 * attempts to access this struct iscsi_tiqn will fail from both transport
182 * fabric and control code paths.
183 */
184 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
185 pr_err("iscsit_set_tiqn_shutdown() failed\n");
186 return;
187 }
188
189 iscsit_wait_for_tiqn(tiqn);
190
191 spin_lock(&tiqn_lock);
192 list_del(&tiqn->tiqn_list);
193 idr_remove(&tiqn_idr, tiqn->tiqn_index);
194 spin_unlock(&tiqn_lock);
195
196 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
197 tiqn->tiqn);
198 kfree(tiqn);
199 }
200
iscsit_access_np(struct iscsi_np * np,struct iscsi_portal_group * tpg)201 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
202 {
203 int ret;
204 /*
205 * Determine if the network portal is accepting storage traffic.
206 */
207 spin_lock_bh(&np->np_thread_lock);
208 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
209 spin_unlock_bh(&np->np_thread_lock);
210 return -1;
211 }
212 spin_unlock_bh(&np->np_thread_lock);
213 /*
214 * Determine if the portal group is accepting storage traffic.
215 */
216 spin_lock_bh(&tpg->tpg_state_lock);
217 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
218 spin_unlock_bh(&tpg->tpg_state_lock);
219 return -1;
220 }
221 spin_unlock_bh(&tpg->tpg_state_lock);
222
223 /*
224 * Here we serialize access across the TIQN+TPG Tuple.
225 */
226 ret = down_interruptible(&tpg->np_login_sem);
227 if (ret != 0)
228 return -1;
229
230 spin_lock_bh(&tpg->tpg_state_lock);
231 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
232 spin_unlock_bh(&tpg->tpg_state_lock);
233 up(&tpg->np_login_sem);
234 return -1;
235 }
236 spin_unlock_bh(&tpg->tpg_state_lock);
237
238 return 0;
239 }
240
iscsit_login_kref_put(struct kref * kref)241 void iscsit_login_kref_put(struct kref *kref)
242 {
243 struct iscsi_tpg_np *tpg_np = container_of(kref,
244 struct iscsi_tpg_np, tpg_np_kref);
245
246 complete(&tpg_np->tpg_np_comp);
247 }
248
iscsit_deaccess_np(struct iscsi_np * np,struct iscsi_portal_group * tpg,struct iscsi_tpg_np * tpg_np)249 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
250 struct iscsi_tpg_np *tpg_np)
251 {
252 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
253
254 up(&tpg->np_login_sem);
255
256 if (tpg_np)
257 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
258
259 if (tiqn)
260 iscsit_put_tiqn_for_login(tiqn);
261
262 return 0;
263 }
264
iscsit_check_np_match(struct sockaddr_storage * sockaddr,struct iscsi_np * np,int network_transport)265 bool iscsit_check_np_match(
266 struct sockaddr_storage *sockaddr,
267 struct iscsi_np *np,
268 int network_transport)
269 {
270 struct sockaddr_in *sock_in, *sock_in_e;
271 struct sockaddr_in6 *sock_in6, *sock_in6_e;
272 bool ip_match = false;
273 u16 port, port_e;
274
275 if (sockaddr->ss_family == AF_INET6) {
276 sock_in6 = (struct sockaddr_in6 *)sockaddr;
277 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
278
279 if (!memcmp(&sock_in6->sin6_addr.in6_u,
280 &sock_in6_e->sin6_addr.in6_u,
281 sizeof(struct in6_addr)))
282 ip_match = true;
283
284 port = ntohs(sock_in6->sin6_port);
285 port_e = ntohs(sock_in6_e->sin6_port);
286 } else {
287 sock_in = (struct sockaddr_in *)sockaddr;
288 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
289
290 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
291 ip_match = true;
292
293 port = ntohs(sock_in->sin_port);
294 port_e = ntohs(sock_in_e->sin_port);
295 }
296
297 if (ip_match && (port_e == port) &&
298 (np->np_network_transport == network_transport))
299 return true;
300
301 return false;
302 }
303
iscsit_get_np(struct sockaddr_storage * sockaddr,int network_transport)304 static struct iscsi_np *iscsit_get_np(
305 struct sockaddr_storage *sockaddr,
306 int network_transport)
307 {
308 struct iscsi_np *np;
309 bool match;
310
311 lockdep_assert_held(&np_lock);
312
313 list_for_each_entry(np, &g_np_list, np_list) {
314 spin_lock_bh(&np->np_thread_lock);
315 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
316 spin_unlock_bh(&np->np_thread_lock);
317 continue;
318 }
319
320 match = iscsit_check_np_match(sockaddr, np, network_transport);
321 if (match) {
322 /*
323 * Increment the np_exports reference count now to
324 * prevent iscsit_del_np() below from being called
325 * while iscsi_tpg_add_network_portal() is called.
326 */
327 np->np_exports++;
328 spin_unlock_bh(&np->np_thread_lock);
329 return np;
330 }
331 spin_unlock_bh(&np->np_thread_lock);
332 }
333
334 return NULL;
335 }
336
iscsit_add_np(struct sockaddr_storage * sockaddr,int network_transport)337 struct iscsi_np *iscsit_add_np(
338 struct sockaddr_storage *sockaddr,
339 int network_transport)
340 {
341 struct iscsi_np *np;
342 int ret;
343
344 mutex_lock(&np_lock);
345
346 /*
347 * Locate the existing struct iscsi_np if already active..
348 */
349 np = iscsit_get_np(sockaddr, network_transport);
350 if (np) {
351 mutex_unlock(&np_lock);
352 return np;
353 }
354
355 np = kzalloc(sizeof(*np), GFP_KERNEL);
356 if (!np) {
357 mutex_unlock(&np_lock);
358 return ERR_PTR(-ENOMEM);
359 }
360
361 np->np_flags |= NPF_IP_NETWORK;
362 np->np_network_transport = network_transport;
363 spin_lock_init(&np->np_thread_lock);
364 init_completion(&np->np_restart_comp);
365 INIT_LIST_HEAD(&np->np_list);
366
367 ret = iscsi_target_setup_login_socket(np, sockaddr);
368 if (ret != 0) {
369 kfree(np);
370 mutex_unlock(&np_lock);
371 return ERR_PTR(ret);
372 }
373
374 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
375 if (IS_ERR(np->np_thread)) {
376 pr_err("Unable to create kthread: iscsi_np\n");
377 ret = PTR_ERR(np->np_thread);
378 kfree(np);
379 mutex_unlock(&np_lock);
380 return ERR_PTR(ret);
381 }
382 /*
383 * Increment the np_exports reference count now to prevent
384 * iscsit_del_np() below from being run while a new call to
385 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
386 * active. We don't need to hold np->np_thread_lock at this
387 * point because iscsi_np has not been added to g_np_list yet.
388 */
389 np->np_exports = 1;
390 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
391
392 list_add_tail(&np->np_list, &g_np_list);
393 mutex_unlock(&np_lock);
394
395 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
396 &np->np_sockaddr, np->np_transport->name);
397
398 return np;
399 }
400
iscsit_reset_np_thread(struct iscsi_np * np,struct iscsi_tpg_np * tpg_np,struct iscsi_portal_group * tpg,bool shutdown)401 int iscsit_reset_np_thread(
402 struct iscsi_np *np,
403 struct iscsi_tpg_np *tpg_np,
404 struct iscsi_portal_group *tpg,
405 bool shutdown)
406 {
407 spin_lock_bh(&np->np_thread_lock);
408 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
409 spin_unlock_bh(&np->np_thread_lock);
410 return 0;
411 }
412 np->np_thread_state = ISCSI_NP_THREAD_RESET;
413 atomic_inc(&np->np_reset_count);
414
415 if (np->np_thread) {
416 spin_unlock_bh(&np->np_thread_lock);
417 send_sig(SIGINT, np->np_thread, 1);
418 wait_for_completion(&np->np_restart_comp);
419 spin_lock_bh(&np->np_thread_lock);
420 }
421 spin_unlock_bh(&np->np_thread_lock);
422
423 if (tpg_np && shutdown) {
424 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
425
426 wait_for_completion(&tpg_np->tpg_np_comp);
427 }
428
429 return 0;
430 }
431
iscsit_free_np(struct iscsi_np * np)432 static void iscsit_free_np(struct iscsi_np *np)
433 {
434 if (np->np_socket)
435 sock_release(np->np_socket);
436 }
437
iscsit_del_np(struct iscsi_np * np)438 int iscsit_del_np(struct iscsi_np *np)
439 {
440 spin_lock_bh(&np->np_thread_lock);
441 np->np_exports--;
442 if (np->np_exports) {
443 np->enabled = true;
444 spin_unlock_bh(&np->np_thread_lock);
445 return 0;
446 }
447 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
448 spin_unlock_bh(&np->np_thread_lock);
449
450 if (np->np_thread) {
451 /*
452 * We need to send the signal to wakeup Linux/Net
453 * which may be sleeping in sock_accept()..
454 */
455 send_sig(SIGINT, np->np_thread, 1);
456 kthread_stop(np->np_thread);
457 np->np_thread = NULL;
458 }
459
460 np->np_transport->iscsit_free_np(np);
461
462 mutex_lock(&np_lock);
463 list_del(&np->np_list);
464 mutex_unlock(&np_lock);
465
466 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
467 &np->np_sockaddr, np->np_transport->name);
468
469 iscsit_put_transport(np->np_transport);
470 kfree(np);
471 return 0;
472 }
473
474 static void iscsit_get_rx_pdu(struct iscsit_conn *);
475
iscsit_queue_rsp(struct iscsit_conn * conn,struct iscsit_cmd * cmd)476 int iscsit_queue_rsp(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
477 {
478 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
479 }
480 EXPORT_SYMBOL(iscsit_queue_rsp);
481
iscsit_aborted_task(struct iscsit_conn * conn,struct iscsit_cmd * cmd)482 void iscsit_aborted_task(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
483 {
484 spin_lock_bh(&conn->cmd_lock);
485 if (!list_empty(&cmd->i_conn_node))
486 list_del_init(&cmd->i_conn_node);
487 spin_unlock_bh(&conn->cmd_lock);
488
489 __iscsit_free_cmd(cmd, true);
490 }
491 EXPORT_SYMBOL(iscsit_aborted_task);
492
493 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
494 u32, u32, const void *, void *);
495 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *);
496
497 static int
iscsit_xmit_nondatain_pdu(struct iscsit_conn * conn,struct iscsit_cmd * cmd,const void * data_buf,u32 data_buf_len)498 iscsit_xmit_nondatain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
499 const void *data_buf, u32 data_buf_len)
500 {
501 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
502 struct kvec *iov;
503 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
504 int ret;
505
506 iov = &cmd->iov_misc[0];
507 iov[niov].iov_base = cmd->pdu;
508 iov[niov++].iov_len = ISCSI_HDR_LEN;
509
510 if (conn->conn_ops->HeaderDigest) {
511 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
512
513 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
514 ISCSI_HDR_LEN, 0, NULL,
515 header_digest);
516
517 iov[0].iov_len += ISCSI_CRC_LEN;
518 tx_size += ISCSI_CRC_LEN;
519 pr_debug("Attaching CRC32C HeaderDigest"
520 " to opcode 0x%x 0x%08x\n",
521 hdr->opcode, *header_digest);
522 }
523
524 if (data_buf_len) {
525 u32 padding = ((-data_buf_len) & 3);
526
527 iov[niov].iov_base = (void *)data_buf;
528 iov[niov++].iov_len = data_buf_len;
529 tx_size += data_buf_len;
530
531 if (padding != 0) {
532 iov[niov].iov_base = &cmd->pad_bytes;
533 iov[niov++].iov_len = padding;
534 tx_size += padding;
535 pr_debug("Attaching %u additional"
536 " padding bytes.\n", padding);
537 }
538
539 if (conn->conn_ops->DataDigest) {
540 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
541 data_buf, data_buf_len,
542 padding, &cmd->pad_bytes,
543 &cmd->data_crc);
544
545 iov[niov].iov_base = &cmd->data_crc;
546 iov[niov++].iov_len = ISCSI_CRC_LEN;
547 tx_size += ISCSI_CRC_LEN;
548 pr_debug("Attached DataDigest for %u"
549 " bytes opcode 0x%x, CRC 0x%08x\n",
550 data_buf_len, hdr->opcode, cmd->data_crc);
551 }
552 }
553
554 cmd->iov_misc_count = niov;
555 cmd->tx_size = tx_size;
556
557 ret = iscsit_send_tx_data(cmd, conn, 1);
558 if (ret < 0) {
559 iscsit_tx_thread_wait_for_tcp(conn);
560 return ret;
561 }
562
563 return 0;
564 }
565
566 static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec,
567 u32 data_offset, u32 data_length);
568 static void iscsit_unmap_iovec(struct iscsit_cmd *);
569 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsit_cmd *,
570 u32, u32, u32, u8 *);
571 static int
iscsit_xmit_datain_pdu(struct iscsit_conn * conn,struct iscsit_cmd * cmd,const struct iscsi_datain * datain)572 iscsit_xmit_datain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
573 const struct iscsi_datain *datain)
574 {
575 struct kvec *iov;
576 u32 iov_count = 0, tx_size = 0;
577 int ret, iov_ret;
578
579 iov = &cmd->iov_data[0];
580 iov[iov_count].iov_base = cmd->pdu;
581 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
582 tx_size += ISCSI_HDR_LEN;
583
584 if (conn->conn_ops->HeaderDigest) {
585 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
586
587 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
588 ISCSI_HDR_LEN, 0, NULL,
589 header_digest);
590
591 iov[0].iov_len += ISCSI_CRC_LEN;
592 tx_size += ISCSI_CRC_LEN;
593
594 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
595 *header_digest);
596 }
597
598 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[iov_count],
599 cmd->orig_iov_data_count - (iov_count + 2),
600 datain->offset, datain->length);
601 if (iov_ret < 0)
602 return -1;
603
604 iov_count += iov_ret;
605 tx_size += datain->length;
606
607 cmd->padding = ((-datain->length) & 3);
608 if (cmd->padding) {
609 iov[iov_count].iov_base = cmd->pad_bytes;
610 iov[iov_count++].iov_len = cmd->padding;
611 tx_size += cmd->padding;
612
613 pr_debug("Attaching %u padding bytes\n", cmd->padding);
614 }
615
616 if (conn->conn_ops->DataDigest) {
617 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
618 cmd, datain->offset,
619 datain->length,
620 cmd->padding,
621 cmd->pad_bytes);
622
623 iov[iov_count].iov_base = &cmd->data_crc;
624 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
625 tx_size += ISCSI_CRC_LEN;
626
627 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
628 datain->length + cmd->padding, cmd->data_crc);
629 }
630
631 cmd->iov_data_count = iov_count;
632 cmd->tx_size = tx_size;
633
634 ret = iscsit_fe_sendpage_sg(cmd, conn);
635
636 iscsit_unmap_iovec(cmd);
637
638 if (ret < 0) {
639 iscsit_tx_thread_wait_for_tcp(conn);
640 return ret;
641 }
642
643 return 0;
644 }
645
iscsit_xmit_pdu(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_datain_req * dr,const void * buf,u32 buf_len)646 static int iscsit_xmit_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
647 struct iscsi_datain_req *dr, const void *buf,
648 u32 buf_len)
649 {
650 if (dr)
651 return iscsit_xmit_datain_pdu(conn, cmd, buf);
652 else
653 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
654 }
655
iscsit_get_sup_prot_ops(struct iscsit_conn * conn)656 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsit_conn *conn)
657 {
658 return TARGET_PROT_NORMAL;
659 }
660
661 static struct iscsit_transport iscsi_target_transport = {
662 .name = "iSCSI/TCP",
663 .transport_type = ISCSI_TCP,
664 .rdma_shutdown = false,
665 .owner = NULL,
666 .iscsit_setup_np = iscsit_setup_np,
667 .iscsit_accept_np = iscsit_accept_np,
668 .iscsit_free_np = iscsit_free_np,
669 .iscsit_get_login_rx = iscsit_get_login_rx,
670 .iscsit_put_login_tx = iscsit_put_login_tx,
671 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
672 .iscsit_immediate_queue = iscsit_immediate_queue,
673 .iscsit_response_queue = iscsit_response_queue,
674 .iscsit_queue_data_in = iscsit_queue_rsp,
675 .iscsit_queue_status = iscsit_queue_rsp,
676 .iscsit_aborted_task = iscsit_aborted_task,
677 .iscsit_xmit_pdu = iscsit_xmit_pdu,
678 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
679 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
680 };
681
iscsi_target_init_module(void)682 static int __init iscsi_target_init_module(void)
683 {
684 int ret = 0, size;
685
686 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
687 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
688 if (!iscsit_global)
689 return -1;
690
691 spin_lock_init(&iscsit_global->ts_bitmap_lock);
692 mutex_init(&auth_id_lock);
693 idr_init(&tiqn_idr);
694
695 ret = target_register_template(&iscsi_ops);
696 if (ret)
697 goto out;
698
699 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
700 iscsit_global->ts_bitmap = vzalloc(size);
701 if (!iscsit_global->ts_bitmap)
702 goto configfs_out;
703
704 if (!zalloc_cpumask_var(&iscsit_global->allowed_cpumask, GFP_KERNEL)) {
705 pr_err("Unable to allocate iscsit_global->allowed_cpumask\n");
706 goto bitmap_out;
707 }
708 cpumask_setall(iscsit_global->allowed_cpumask);
709
710 lio_qr_cache = kmem_cache_create("lio_qr_cache",
711 sizeof(struct iscsi_queue_req),
712 __alignof__(struct iscsi_queue_req), 0, NULL);
713 if (!lio_qr_cache) {
714 pr_err("Unable to kmem_cache_create() for"
715 " lio_qr_cache\n");
716 goto cpumask_out;
717 }
718
719 lio_dr_cache = kmem_cache_create("lio_dr_cache",
720 sizeof(struct iscsi_datain_req),
721 __alignof__(struct iscsi_datain_req), 0, NULL);
722 if (!lio_dr_cache) {
723 pr_err("Unable to kmem_cache_create() for"
724 " lio_dr_cache\n");
725 goto qr_out;
726 }
727
728 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
729 sizeof(struct iscsi_ooo_cmdsn),
730 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
731 if (!lio_ooo_cache) {
732 pr_err("Unable to kmem_cache_create() for"
733 " lio_ooo_cache\n");
734 goto dr_out;
735 }
736
737 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
738 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
739 0, NULL);
740 if (!lio_r2t_cache) {
741 pr_err("Unable to kmem_cache_create() for"
742 " lio_r2t_cache\n");
743 goto ooo_out;
744 }
745
746 iscsit_register_transport(&iscsi_target_transport);
747
748 if (iscsit_load_discovery_tpg() < 0)
749 goto r2t_out;
750
751 return ret;
752 r2t_out:
753 iscsit_unregister_transport(&iscsi_target_transport);
754 kmem_cache_destroy(lio_r2t_cache);
755 ooo_out:
756 kmem_cache_destroy(lio_ooo_cache);
757 dr_out:
758 kmem_cache_destroy(lio_dr_cache);
759 qr_out:
760 kmem_cache_destroy(lio_qr_cache);
761 cpumask_out:
762 free_cpumask_var(iscsit_global->allowed_cpumask);
763 bitmap_out:
764 vfree(iscsit_global->ts_bitmap);
765 configfs_out:
766 /* XXX: this probably wants it to be it's own unwind step.. */
767 if (iscsit_global->discovery_tpg)
768 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
769 target_unregister_template(&iscsi_ops);
770 out:
771 kfree(iscsit_global);
772 return -ENOMEM;
773 }
774
iscsi_target_cleanup_module(void)775 static void __exit iscsi_target_cleanup_module(void)
776 {
777 iscsit_release_discovery_tpg();
778 iscsit_unregister_transport(&iscsi_target_transport);
779 kmem_cache_destroy(lio_qr_cache);
780 kmem_cache_destroy(lio_dr_cache);
781 kmem_cache_destroy(lio_ooo_cache);
782 kmem_cache_destroy(lio_r2t_cache);
783
784 /*
785 * Shutdown discovery sessions and disable discovery TPG
786 */
787 if (iscsit_global->discovery_tpg)
788 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
789
790 target_unregister_template(&iscsi_ops);
791
792 free_cpumask_var(iscsit_global->allowed_cpumask);
793 vfree(iscsit_global->ts_bitmap);
794 kfree(iscsit_global);
795 }
796
iscsit_add_reject(struct iscsit_conn * conn,u8 reason,unsigned char * buf)797 int iscsit_add_reject(
798 struct iscsit_conn *conn,
799 u8 reason,
800 unsigned char *buf)
801 {
802 struct iscsit_cmd *cmd;
803
804 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
805 if (!cmd)
806 return -1;
807
808 cmd->iscsi_opcode = ISCSI_OP_REJECT;
809 cmd->reject_reason = reason;
810
811 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
812 if (!cmd->buf_ptr) {
813 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
814 iscsit_free_cmd(cmd, false);
815 return -1;
816 }
817
818 spin_lock_bh(&conn->cmd_lock);
819 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
820 spin_unlock_bh(&conn->cmd_lock);
821
822 cmd->i_state = ISTATE_SEND_REJECT;
823 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
824
825 return -1;
826 }
827 EXPORT_SYMBOL(iscsit_add_reject);
828
iscsit_add_reject_from_cmd(struct iscsit_cmd * cmd,u8 reason,bool add_to_conn,unsigned char * buf)829 static int iscsit_add_reject_from_cmd(
830 struct iscsit_cmd *cmd,
831 u8 reason,
832 bool add_to_conn,
833 unsigned char *buf)
834 {
835 struct iscsit_conn *conn;
836 const bool do_put = cmd->se_cmd.se_tfo != NULL;
837
838 if (!cmd->conn) {
839 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
840 cmd->init_task_tag);
841 return -1;
842 }
843 conn = cmd->conn;
844
845 cmd->iscsi_opcode = ISCSI_OP_REJECT;
846 cmd->reject_reason = reason;
847
848 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
849 if (!cmd->buf_ptr) {
850 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
851 iscsit_free_cmd(cmd, false);
852 return -1;
853 }
854
855 if (add_to_conn) {
856 spin_lock_bh(&conn->cmd_lock);
857 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
858 spin_unlock_bh(&conn->cmd_lock);
859 }
860
861 cmd->i_state = ISTATE_SEND_REJECT;
862 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
863 /*
864 * Perform the kref_put now if se_cmd has already been setup by
865 * scsit_setup_scsi_cmd()
866 */
867 if (do_put) {
868 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
869 target_put_sess_cmd(&cmd->se_cmd);
870 }
871 return -1;
872 }
873
iscsit_add_reject_cmd(struct iscsit_cmd * cmd,u8 reason,unsigned char * buf)874 static int iscsit_add_reject_cmd(struct iscsit_cmd *cmd, u8 reason,
875 unsigned char *buf)
876 {
877 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
878 }
879
iscsit_reject_cmd(struct iscsit_cmd * cmd,u8 reason,unsigned char * buf)880 int iscsit_reject_cmd(struct iscsit_cmd *cmd, u8 reason, unsigned char *buf)
881 {
882 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
883 }
884 EXPORT_SYMBOL(iscsit_reject_cmd);
885
886 /*
887 * Map some portion of the allocated scatterlist to an iovec, suitable for
888 * kernel sockets to copy data in/out.
889 */
iscsit_map_iovec(struct iscsit_cmd * cmd,struct kvec * iov,int nvec,u32 data_offset,u32 data_length)890 static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec,
891 u32 data_offset, u32 data_length)
892 {
893 u32 i = 0, orig_data_length = data_length;
894 struct scatterlist *sg;
895 unsigned int page_off;
896
897 /*
898 * We know each entry in t_data_sg contains a page.
899 */
900 u32 ent = data_offset / PAGE_SIZE;
901
902 if (!data_length)
903 return 0;
904
905 if (ent >= cmd->se_cmd.t_data_nents) {
906 pr_err("Initial page entry out-of-bounds\n");
907 goto overflow;
908 }
909
910 sg = &cmd->se_cmd.t_data_sg[ent];
911 page_off = (data_offset % PAGE_SIZE);
912
913 cmd->first_data_sg = sg;
914 cmd->first_data_sg_off = page_off;
915
916 while (data_length) {
917 u32 cur_len;
918
919 if (WARN_ON_ONCE(!sg || i >= nvec))
920 goto overflow;
921
922 cur_len = min_t(u32, data_length, sg->length - page_off);
923
924 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
925 iov[i].iov_len = cur_len;
926
927 data_length -= cur_len;
928 page_off = 0;
929 sg = sg_next(sg);
930 i++;
931 }
932
933 cmd->kmapped_nents = i;
934
935 return i;
936
937 overflow:
938 pr_err("offset %d + length %d overflow; %d/%d; sg-list:\n",
939 data_offset, orig_data_length, i, nvec);
940 for_each_sg(cmd->se_cmd.t_data_sg, sg,
941 cmd->se_cmd.t_data_nents, i) {
942 pr_err("[%d] off %d len %d\n",
943 i, sg->offset, sg->length);
944 }
945 return -1;
946 }
947
iscsit_unmap_iovec(struct iscsit_cmd * cmd)948 static void iscsit_unmap_iovec(struct iscsit_cmd *cmd)
949 {
950 u32 i;
951 struct scatterlist *sg;
952
953 sg = cmd->first_data_sg;
954
955 for (i = 0; i < cmd->kmapped_nents; i++)
956 kunmap(sg_page(&sg[i]));
957 }
958
iscsit_ack_from_expstatsn(struct iscsit_conn * conn,u32 exp_statsn)959 static void iscsit_ack_from_expstatsn(struct iscsit_conn *conn, u32 exp_statsn)
960 {
961 LIST_HEAD(ack_list);
962 struct iscsit_cmd *cmd, *cmd_p;
963
964 conn->exp_statsn = exp_statsn;
965
966 if (conn->sess->sess_ops->RDMAExtensions)
967 return;
968
969 spin_lock_bh(&conn->cmd_lock);
970 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
971 spin_lock(&cmd->istate_lock);
972 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
973 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
974 cmd->i_state = ISTATE_REMOVE;
975 spin_unlock(&cmd->istate_lock);
976 list_move_tail(&cmd->i_conn_node, &ack_list);
977 continue;
978 }
979 spin_unlock(&cmd->istate_lock);
980 }
981 spin_unlock_bh(&conn->cmd_lock);
982
983 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
984 list_del_init(&cmd->i_conn_node);
985 iscsit_free_cmd(cmd, false);
986 }
987 }
988
iscsit_allocate_iovecs(struct iscsit_cmd * cmd)989 static int iscsit_allocate_iovecs(struct iscsit_cmd *cmd)
990 {
991 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
992
993 iov_count += ISCSI_IOV_DATA_BUFFER;
994 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
995 if (!cmd->iov_data)
996 return -ENOMEM;
997
998 cmd->orig_iov_data_count = iov_count;
999 return 0;
1000 }
1001
iscsit_setup_scsi_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)1002 int iscsit_setup_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1003 unsigned char *buf)
1004 {
1005 int data_direction, payload_length;
1006 struct iscsi_ecdb_ahdr *ecdb_ahdr;
1007 struct iscsi_scsi_req *hdr;
1008 int iscsi_task_attr;
1009 unsigned char *cdb;
1010 int sam_task_attr;
1011
1012 atomic_long_inc(&conn->sess->cmd_pdus);
1013
1014 hdr = (struct iscsi_scsi_req *) buf;
1015 payload_length = ntoh24(hdr->dlength);
1016
1017 /* FIXME; Add checks for AdditionalHeaderSegment */
1018
1019 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1020 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1021 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1022 " not set. Bad iSCSI Initiator.\n");
1023 return iscsit_add_reject_cmd(cmd,
1024 ISCSI_REASON_BOOKMARK_INVALID, buf);
1025 }
1026
1027 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1028 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1029 /*
1030 * From RFC-3720 Section 10.3.1:
1031 *
1032 * "Either or both of R and W MAY be 1 when either the
1033 * Expected Data Transfer Length and/or Bidirectional Read
1034 * Expected Data Transfer Length are 0"
1035 *
1036 * For this case, go ahead and clear the unnecssary bits
1037 * to avoid any confusion with ->data_direction.
1038 */
1039 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1040 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1041
1042 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1043 " set when Expected Data Transfer Length is 0 for"
1044 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1045 }
1046
1047 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1048 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1049 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1050 " MUST be set if Expected Data Transfer Length is not 0."
1051 " Bad iSCSI Initiator\n");
1052 return iscsit_add_reject_cmd(cmd,
1053 ISCSI_REASON_BOOKMARK_INVALID, buf);
1054 }
1055
1056 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1057 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1058 pr_err("Bidirectional operations not supported!\n");
1059 return iscsit_add_reject_cmd(cmd,
1060 ISCSI_REASON_BOOKMARK_INVALID, buf);
1061 }
1062
1063 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1064 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1065 " Scsi Command PDU.\n");
1066 return iscsit_add_reject_cmd(cmd,
1067 ISCSI_REASON_BOOKMARK_INVALID, buf);
1068 }
1069
1070 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1071 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1072 " protocol error.\n", payload_length);
1073 return iscsit_add_reject_cmd(cmd,
1074 ISCSI_REASON_PROTOCOL_ERROR, buf);
1075 }
1076
1077 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1078 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1079 pr_err("Expected Data Transfer Length and Length of"
1080 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1081 " bit is not set protocol error\n");
1082 return iscsit_add_reject_cmd(cmd,
1083 ISCSI_REASON_PROTOCOL_ERROR, buf);
1084 }
1085
1086 if (payload_length > be32_to_cpu(hdr->data_length)) {
1087 pr_err("DataSegmentLength: %u is greater than"
1088 " EDTL: %u, protocol error.\n", payload_length,
1089 hdr->data_length);
1090 return iscsit_add_reject_cmd(cmd,
1091 ISCSI_REASON_PROTOCOL_ERROR, buf);
1092 }
1093
1094 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1095 pr_err("DataSegmentLength: %u is greater than"
1096 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1097 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1098 return iscsit_add_reject_cmd(cmd,
1099 ISCSI_REASON_PROTOCOL_ERROR, buf);
1100 }
1101
1102 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1103 pr_err("DataSegmentLength: %u is greater than"
1104 " FirstBurstLength: %u, protocol error.\n",
1105 payload_length, conn->sess->sess_ops->FirstBurstLength);
1106 return iscsit_add_reject_cmd(cmd,
1107 ISCSI_REASON_BOOKMARK_INVALID, buf);
1108 }
1109
1110 cdb = hdr->cdb;
1111
1112 if (hdr->hlength) {
1113 ecdb_ahdr = (struct iscsi_ecdb_ahdr *) (hdr + 1);
1114 if (ecdb_ahdr->ahstype != ISCSI_AHSTYPE_CDB) {
1115 pr_err("Additional Header Segment type %d not supported!\n",
1116 ecdb_ahdr->ahstype);
1117 return iscsit_add_reject_cmd(cmd,
1118 ISCSI_REASON_CMD_NOT_SUPPORTED, buf);
1119 }
1120
1121 cdb = kmalloc(be16_to_cpu(ecdb_ahdr->ahslength) + 15,
1122 GFP_KERNEL);
1123 if (cdb == NULL)
1124 return iscsit_add_reject_cmd(cmd,
1125 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1126 memcpy(cdb, hdr->cdb, ISCSI_CDB_SIZE);
1127 memcpy(cdb + ISCSI_CDB_SIZE, ecdb_ahdr->ecdb,
1128 be16_to_cpu(ecdb_ahdr->ahslength) - 1);
1129 }
1130
1131 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1132 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1133 DMA_NONE;
1134
1135 cmd->data_direction = data_direction;
1136 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1137 /*
1138 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1139 */
1140 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1141 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1142 sam_task_attr = TCM_SIMPLE_TAG;
1143 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1144 sam_task_attr = TCM_ORDERED_TAG;
1145 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1146 sam_task_attr = TCM_HEAD_TAG;
1147 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1148 sam_task_attr = TCM_ACA_TAG;
1149 else {
1150 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1151 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1152 sam_task_attr = TCM_SIMPLE_TAG;
1153 }
1154
1155 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1156 cmd->i_state = ISTATE_NEW_CMD;
1157 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1158 cmd->immediate_data = (payload_length) ? 1 : 0;
1159 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1160 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1161 if (cmd->unsolicited_data)
1162 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1163
1164 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1165 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1166 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1167 else
1168 cmd->targ_xfer_tag = 0xFFFFFFFF;
1169 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1170 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1171 cmd->first_burst_len = payload_length;
1172
1173 if (!conn->sess->sess_ops->RDMAExtensions &&
1174 cmd->data_direction == DMA_FROM_DEVICE) {
1175 struct iscsi_datain_req *dr;
1176
1177 dr = iscsit_allocate_datain_req();
1178 if (!dr) {
1179 if (cdb != hdr->cdb)
1180 kfree(cdb);
1181 return iscsit_add_reject_cmd(cmd,
1182 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1183 }
1184
1185 iscsit_attach_datain_req(cmd, dr);
1186 }
1187
1188 /*
1189 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1190 */
1191 __target_init_cmd(&cmd->se_cmd, &iscsi_ops,
1192 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1193 cmd->data_direction, sam_task_attr,
1194 cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun),
1195 conn->cmd_cnt);
1196
1197 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1198 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1199 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1200 conn->cid);
1201
1202 target_get_sess_cmd(&cmd->se_cmd, true);
1203
1204 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1205 cmd->sense_reason = target_cmd_init_cdb(&cmd->se_cmd, cdb,
1206 GFP_KERNEL);
1207
1208 if (cdb != hdr->cdb)
1209 kfree(cdb);
1210
1211 if (cmd->sense_reason) {
1212 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1213 return iscsit_add_reject_cmd(cmd,
1214 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1215 }
1216
1217 goto attach_cmd;
1218 }
1219
1220 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd);
1221 if (cmd->sense_reason)
1222 goto attach_cmd;
1223
1224 cmd->sense_reason = target_cmd_parse_cdb(&cmd->se_cmd);
1225 if (cmd->sense_reason)
1226 goto attach_cmd;
1227
1228 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1229 return iscsit_add_reject_cmd(cmd,
1230 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1231 }
1232
1233 attach_cmd:
1234 spin_lock_bh(&conn->cmd_lock);
1235 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1236 spin_unlock_bh(&conn->cmd_lock);
1237 /*
1238 * Check if we need to delay processing because of ALUA
1239 * Active/NonOptimized primary access state..
1240 */
1241 core_alua_check_nonop_delay(&cmd->se_cmd);
1242
1243 return 0;
1244 }
1245 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1246
iscsit_set_unsolicited_dataout(struct iscsit_cmd * cmd)1247 void iscsit_set_unsolicited_dataout(struct iscsit_cmd *cmd)
1248 {
1249 iscsit_set_dataout_sequence_values(cmd);
1250
1251 spin_lock_bh(&cmd->dataout_timeout_lock);
1252 iscsit_start_dataout_timer(cmd, cmd->conn);
1253 spin_unlock_bh(&cmd->dataout_timeout_lock);
1254 }
1255 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout);
1256
iscsit_process_scsi_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_scsi_req * hdr)1257 int iscsit_process_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1258 struct iscsi_scsi_req *hdr)
1259 {
1260 int cmdsn_ret = 0;
1261 /*
1262 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1263 * the Immediate Bit is not set, and no Immediate
1264 * Data is attached.
1265 *
1266 * A PDU/CmdSN carrying Immediate Data can only
1267 * be processed after the DataCRC has passed.
1268 * If the DataCRC fails, the CmdSN MUST NOT
1269 * be acknowledged. (See below)
1270 */
1271 if (!cmd->immediate_data) {
1272 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1273 (unsigned char *)hdr, hdr->cmdsn);
1274 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1275 return -1;
1276 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1277 target_put_sess_cmd(&cmd->se_cmd);
1278 return 0;
1279 }
1280 }
1281
1282 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1283
1284 /*
1285 * If no Immediate Data is attached, it's OK to return now.
1286 */
1287 if (!cmd->immediate_data) {
1288 if (!cmd->sense_reason && cmd->unsolicited_data)
1289 iscsit_set_unsolicited_dataout(cmd);
1290 if (!cmd->sense_reason)
1291 return 0;
1292
1293 target_put_sess_cmd(&cmd->se_cmd);
1294 return 0;
1295 }
1296
1297 /*
1298 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1299 * execution. These exceptions are processed in CmdSN order using
1300 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1301 */
1302 if (cmd->sense_reason)
1303 return 1;
1304 /*
1305 * Call directly into transport_generic_new_cmd() to perform
1306 * the backend memory allocation.
1307 */
1308 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1309 if (cmd->sense_reason)
1310 return 1;
1311
1312 return 0;
1313 }
1314 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1315
1316 static int
iscsit_get_immediate_data(struct iscsit_cmd * cmd,struct iscsi_scsi_req * hdr,bool dump_payload)1317 iscsit_get_immediate_data(struct iscsit_cmd *cmd, struct iscsi_scsi_req *hdr,
1318 bool dump_payload)
1319 {
1320 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1321 int rc;
1322
1323 /*
1324 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1325 */
1326 if (dump_payload) {
1327 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done,
1328 cmd->first_burst_len);
1329
1330 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n",
1331 cmd->se_cmd.data_length, cmd->write_data_done,
1332 cmd->first_burst_len, length);
1333 rc = iscsit_dump_data_payload(cmd->conn, length, 1);
1334 pr_debug("Finished dumping immediate data\n");
1335 if (rc < 0)
1336 immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER;
1337 } else {
1338 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1339 cmd->first_burst_len);
1340 }
1341
1342 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1343 /*
1344 * A PDU/CmdSN carrying Immediate Data passed
1345 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1346 * Immediate Bit is not set.
1347 */
1348 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1349 (unsigned char *)hdr, hdr->cmdsn);
1350 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1351 return -1;
1352
1353 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1354 target_put_sess_cmd(&cmd->se_cmd);
1355
1356 return 0;
1357 } else if (cmd->unsolicited_data)
1358 iscsit_set_unsolicited_dataout(cmd);
1359
1360 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1361 /*
1362 * Immediate Data failed DataCRC and ERL>=1,
1363 * silently drop this PDU and let the initiator
1364 * plug the CmdSN gap.
1365 *
1366 * FIXME: Send Unsolicited NOPIN with reserved
1367 * TTT here to help the initiator figure out
1368 * the missing CmdSN, although they should be
1369 * intelligent enough to determine the missing
1370 * CmdSN and issue a retry to plug the sequence.
1371 */
1372 cmd->i_state = ISTATE_REMOVE;
1373 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1374 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1375 return -1;
1376
1377 return 0;
1378 }
1379
1380 static int
iscsit_handle_scsi_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)1381 iscsit_handle_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1382 unsigned char *buf)
1383 {
1384 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1385 int rc, immed_data;
1386 bool dump_payload = false;
1387
1388 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1389 if (rc < 0)
1390 return 0;
1391 /*
1392 * Allocation iovecs needed for struct socket operations for
1393 * traditional iSCSI block I/O.
1394 */
1395 if (iscsit_allocate_iovecs(cmd) < 0) {
1396 return iscsit_reject_cmd(cmd,
1397 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1398 }
1399 immed_data = cmd->immediate_data;
1400
1401 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1402 if (rc < 0)
1403 return rc;
1404 else if (rc > 0)
1405 dump_payload = true;
1406
1407 if (!immed_data)
1408 return 0;
1409
1410 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1411 }
1412
iscsit_do_crypto_hash_sg(struct ahash_request * hash,struct iscsit_cmd * cmd,u32 data_offset,u32 data_length,u32 padding,u8 * pad_bytes)1413 static u32 iscsit_do_crypto_hash_sg(
1414 struct ahash_request *hash,
1415 struct iscsit_cmd *cmd,
1416 u32 data_offset,
1417 u32 data_length,
1418 u32 padding,
1419 u8 *pad_bytes)
1420 {
1421 u32 data_crc;
1422 struct scatterlist *sg;
1423 unsigned int page_off;
1424
1425 crypto_ahash_init(hash);
1426
1427 sg = cmd->first_data_sg;
1428 page_off = cmd->first_data_sg_off;
1429
1430 if (data_length && page_off) {
1431 struct scatterlist first_sg;
1432 u32 len = min_t(u32, data_length, sg->length - page_off);
1433
1434 sg_init_table(&first_sg, 1);
1435 sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off);
1436
1437 ahash_request_set_crypt(hash, &first_sg, NULL, len);
1438 crypto_ahash_update(hash);
1439
1440 data_length -= len;
1441 sg = sg_next(sg);
1442 }
1443
1444 while (data_length) {
1445 u32 cur_len = min_t(u32, data_length, sg->length);
1446
1447 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1448 crypto_ahash_update(hash);
1449
1450 data_length -= cur_len;
1451 /* iscsit_map_iovec has already checked for invalid sg pointers */
1452 sg = sg_next(sg);
1453 }
1454
1455 if (padding) {
1456 struct scatterlist pad_sg;
1457
1458 sg_init_one(&pad_sg, pad_bytes, padding);
1459 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1460 padding);
1461 crypto_ahash_finup(hash);
1462 } else {
1463 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1464 crypto_ahash_final(hash);
1465 }
1466
1467 return data_crc;
1468 }
1469
iscsit_do_crypto_hash_buf(struct ahash_request * hash,const void * buf,u32 payload_length,u32 padding,const void * pad_bytes,void * data_crc)1470 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1471 const void *buf, u32 payload_length, u32 padding,
1472 const void *pad_bytes, void *data_crc)
1473 {
1474 struct scatterlist sg[2];
1475
1476 sg_init_table(sg, ARRAY_SIZE(sg));
1477 sg_set_buf(sg, buf, payload_length);
1478 if (padding)
1479 sg_set_buf(sg + 1, pad_bytes, padding);
1480
1481 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1482
1483 crypto_ahash_digest(hash);
1484 }
1485
1486 int
__iscsit_check_dataout_hdr(struct iscsit_conn * conn,void * buf,struct iscsit_cmd * cmd,u32 payload_length,bool * success)1487 __iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf,
1488 struct iscsit_cmd *cmd, u32 payload_length,
1489 bool *success)
1490 {
1491 struct iscsi_data *hdr = buf;
1492 struct se_cmd *se_cmd;
1493 int rc;
1494
1495 /* iSCSI write */
1496 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1497
1498 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1499 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1500 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1501 payload_length, conn->cid);
1502
1503 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1504 pr_err("Command ITT: 0x%08x received DataOUT after"
1505 " last DataOUT received, dumping payload\n",
1506 cmd->init_task_tag);
1507 return iscsit_dump_data_payload(conn, payload_length, 1);
1508 }
1509
1510 if (cmd->data_direction != DMA_TO_DEVICE) {
1511 pr_err("Command ITT: 0x%08x received DataOUT for a"
1512 " NON-WRITE command.\n", cmd->init_task_tag);
1513 return iscsit_dump_data_payload(conn, payload_length, 1);
1514 }
1515 se_cmd = &cmd->se_cmd;
1516 iscsit_mod_dataout_timer(cmd);
1517
1518 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1519 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1520 be32_to_cpu(hdr->offset), payload_length,
1521 cmd->se_cmd.data_length);
1522 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1523 }
1524
1525 if (cmd->unsolicited_data) {
1526 int dump_unsolicited_data = 0;
1527
1528 if (conn->sess->sess_ops->InitialR2T) {
1529 pr_err("Received unexpected unsolicited data"
1530 " while InitialR2T=Yes, protocol error.\n");
1531 transport_send_check_condition_and_sense(&cmd->se_cmd,
1532 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1533 return -1;
1534 }
1535 /*
1536 * Special case for dealing with Unsolicited DataOUT
1537 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1538 * failures;
1539 */
1540
1541 /* Something's amiss if we're not in WRITE_PENDING state... */
1542 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1543 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1544 dump_unsolicited_data = 1;
1545
1546 if (dump_unsolicited_data) {
1547 /*
1548 * Check if a delayed TASK_ABORTED status needs to
1549 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1550 * received with the unsolicited data out.
1551 */
1552 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1553 iscsit_stop_dataout_timer(cmd);
1554
1555 return iscsit_dump_data_payload(conn, payload_length, 1);
1556 }
1557 } else {
1558 /*
1559 * For the normal solicited data path:
1560 *
1561 * Check for a delayed TASK_ABORTED status and dump any
1562 * incoming data out payload if one exists. Also, when the
1563 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1564 * data out sequence, we decrement outstanding_r2ts. Once
1565 * outstanding_r2ts reaches zero, go ahead and send the delayed
1566 * TASK_ABORTED status.
1567 */
1568 if (se_cmd->transport_state & CMD_T_ABORTED) {
1569 if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1570 --cmd->outstanding_r2ts < 1)
1571 iscsit_stop_dataout_timer(cmd);
1572
1573 return iscsit_dump_data_payload(conn, payload_length, 1);
1574 }
1575 }
1576 /*
1577 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1578 * within-command recovery checks before receiving the payload.
1579 */
1580 rc = iscsit_check_pre_dataout(cmd, buf);
1581 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1582 return 0;
1583 else if (rc == DATAOUT_CANNOT_RECOVER)
1584 return -1;
1585 *success = true;
1586 return 0;
1587 }
1588 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1589
1590 int
iscsit_check_dataout_hdr(struct iscsit_conn * conn,void * buf,struct iscsit_cmd ** out_cmd)1591 iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf,
1592 struct iscsit_cmd **out_cmd)
1593 {
1594 struct iscsi_data *hdr = buf;
1595 struct iscsit_cmd *cmd;
1596 u32 payload_length = ntoh24(hdr->dlength);
1597 int rc;
1598 bool success = false;
1599
1600 if (!payload_length) {
1601 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1602 return 0;
1603 }
1604
1605 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1606 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1607 " MaxXmitDataSegmentLength: %u\n", payload_length,
1608 conn->conn_ops->MaxXmitDataSegmentLength);
1609 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1610 }
1611
1612 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1613 if (!cmd)
1614 return 0;
1615
1616 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1617
1618 if (success)
1619 *out_cmd = cmd;
1620
1621 return rc;
1622 }
1623 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1624
1625 static int
iscsit_get_dataout(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_data * hdr)1626 iscsit_get_dataout(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1627 struct iscsi_data *hdr)
1628 {
1629 struct kvec *iov;
1630 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1631 u32 payload_length;
1632 int iov_ret, data_crc_failed = 0;
1633
1634 payload_length = min_t(u32, cmd->se_cmd.data_length,
1635 ntoh24(hdr->dlength));
1636 rx_size += payload_length;
1637 iov = &cmd->iov_data[0];
1638
1639 iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2,
1640 be32_to_cpu(hdr->offset), payload_length);
1641 if (iov_ret < 0)
1642 return -1;
1643
1644 iov_count += iov_ret;
1645
1646 padding = ((-payload_length) & 3);
1647 if (padding != 0) {
1648 iov[iov_count].iov_base = cmd->pad_bytes;
1649 iov[iov_count++].iov_len = padding;
1650 rx_size += padding;
1651 pr_debug("Receiving %u padding bytes.\n", padding);
1652 }
1653
1654 if (conn->conn_ops->DataDigest) {
1655 iov[iov_count].iov_base = &checksum;
1656 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1657 rx_size += ISCSI_CRC_LEN;
1658 }
1659
1660 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
1661 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1662
1663 iscsit_unmap_iovec(cmd);
1664
1665 if (rx_got != rx_size)
1666 return -1;
1667
1668 if (conn->conn_ops->DataDigest) {
1669 u32 data_crc;
1670
1671 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1672 be32_to_cpu(hdr->offset),
1673 payload_length, padding,
1674 cmd->pad_bytes);
1675
1676 if (checksum != data_crc) {
1677 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1678 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1679 " does not match computed 0x%08x\n",
1680 hdr->itt, hdr->offset, payload_length,
1681 hdr->datasn, checksum, data_crc);
1682 data_crc_failed = 1;
1683 } else {
1684 pr_debug("Got CRC32C DataDigest 0x%08x for"
1685 " %u bytes of Data Out\n", checksum,
1686 payload_length);
1687 }
1688 }
1689
1690 return data_crc_failed;
1691 }
1692
1693 int
iscsit_check_dataout_payload(struct iscsit_cmd * cmd,struct iscsi_data * hdr,bool data_crc_failed)1694 iscsit_check_dataout_payload(struct iscsit_cmd *cmd, struct iscsi_data *hdr,
1695 bool data_crc_failed)
1696 {
1697 struct iscsit_conn *conn = cmd->conn;
1698 int rc, ooo_cmdsn;
1699 /*
1700 * Increment post receive data and CRC values or perform
1701 * within-command recovery.
1702 */
1703 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1704 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1705 return 0;
1706 else if (rc == DATAOUT_SEND_R2T) {
1707 iscsit_set_dataout_sequence_values(cmd);
1708 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1709 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1710 /*
1711 * Handle extra special case for out of order
1712 * Unsolicited Data Out.
1713 */
1714 spin_lock_bh(&cmd->istate_lock);
1715 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1716 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1717 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1718 spin_unlock_bh(&cmd->istate_lock);
1719
1720 iscsit_stop_dataout_timer(cmd);
1721 if (ooo_cmdsn)
1722 return 0;
1723 target_execute_cmd(&cmd->se_cmd);
1724 return 0;
1725 } else /* DATAOUT_CANNOT_RECOVER */
1726 return -1;
1727
1728 return 0;
1729 }
1730 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1731
iscsit_handle_data_out(struct iscsit_conn * conn,unsigned char * buf)1732 static int iscsit_handle_data_out(struct iscsit_conn *conn, unsigned char *buf)
1733 {
1734 struct iscsit_cmd *cmd = NULL;
1735 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1736 int rc;
1737 bool data_crc_failed = false;
1738
1739 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1740 if (rc < 0)
1741 return 0;
1742 else if (!cmd)
1743 return 0;
1744
1745 rc = iscsit_get_dataout(conn, cmd, hdr);
1746 if (rc < 0)
1747 return rc;
1748 else if (rc > 0)
1749 data_crc_failed = true;
1750
1751 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1752 }
1753
iscsit_setup_nop_out(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_nopout * hdr)1754 int iscsit_setup_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1755 struct iscsi_nopout *hdr)
1756 {
1757 u32 payload_length = ntoh24(hdr->dlength);
1758
1759 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1760 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1761 if (!cmd)
1762 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1763 (unsigned char *)hdr);
1764
1765 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1766 (unsigned char *)hdr);
1767 }
1768
1769 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1770 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1771 " not set, protocol error.\n");
1772 if (!cmd)
1773 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1774 (unsigned char *)hdr);
1775
1776 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1777 (unsigned char *)hdr);
1778 }
1779
1780 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1781 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1782 " greater than MaxXmitDataSegmentLength: %u, protocol"
1783 " error.\n", payload_length,
1784 conn->conn_ops->MaxXmitDataSegmentLength);
1785 if (!cmd)
1786 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1787 (unsigned char *)hdr);
1788
1789 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1790 (unsigned char *)hdr);
1791 }
1792
1793 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1794 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1795 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1796 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1797 payload_length);
1798 /*
1799 * This is not a response to a Unsolicited NopIN, which means
1800 * it can either be a NOPOUT ping request (with a valid ITT),
1801 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1802 * Either way, make sure we allocate an struct iscsit_cmd, as both
1803 * can contain ping data.
1804 */
1805 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1806 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1807 cmd->i_state = ISTATE_SEND_NOPIN;
1808 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1809 1 : 0);
1810 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1811 cmd->targ_xfer_tag = 0xFFFFFFFF;
1812 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1813 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1814 cmd->data_direction = DMA_NONE;
1815 }
1816
1817 return 0;
1818 }
1819 EXPORT_SYMBOL(iscsit_setup_nop_out);
1820
iscsit_process_nop_out(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_nopout * hdr)1821 int iscsit_process_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1822 struct iscsi_nopout *hdr)
1823 {
1824 struct iscsit_cmd *cmd_p = NULL;
1825 int cmdsn_ret = 0;
1826 /*
1827 * Initiator is expecting a NopIN ping reply..
1828 */
1829 if (hdr->itt != RESERVED_ITT) {
1830 if (!cmd)
1831 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1832 (unsigned char *)hdr);
1833
1834 spin_lock_bh(&conn->cmd_lock);
1835 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1836 spin_unlock_bh(&conn->cmd_lock);
1837
1838 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1839
1840 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1841 iscsit_add_cmd_to_response_queue(cmd, conn,
1842 cmd->i_state);
1843 return 0;
1844 }
1845
1846 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1847 (unsigned char *)hdr, hdr->cmdsn);
1848 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1849 return 0;
1850 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1851 return -1;
1852
1853 return 0;
1854 }
1855 /*
1856 * This was a response to a unsolicited NOPIN ping.
1857 */
1858 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1859 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1860 if (!cmd_p)
1861 return -EINVAL;
1862
1863 iscsit_stop_nopin_response_timer(conn);
1864
1865 cmd_p->i_state = ISTATE_REMOVE;
1866 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1867
1868 iscsit_start_nopin_timer(conn);
1869 return 0;
1870 }
1871 /*
1872 * Otherwise, initiator is not expecting a NOPIN is response.
1873 * Just ignore for now.
1874 */
1875
1876 if (cmd)
1877 iscsit_free_cmd(cmd, false);
1878
1879 return 0;
1880 }
1881 EXPORT_SYMBOL(iscsit_process_nop_out);
1882
iscsit_handle_nop_out(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)1883 static int iscsit_handle_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1884 unsigned char *buf)
1885 {
1886 unsigned char *ping_data = NULL;
1887 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1888 struct kvec *iov = NULL;
1889 u32 payload_length = ntoh24(hdr->dlength);
1890 int ret;
1891
1892 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1893 if (ret < 0)
1894 return 0;
1895 /*
1896 * Handle NOP-OUT payload for traditional iSCSI sockets
1897 */
1898 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1899 u32 checksum, data_crc, padding = 0;
1900 int niov = 0, rx_got, rx_size = payload_length;
1901
1902 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1903 if (!ping_data) {
1904 ret = -1;
1905 goto out;
1906 }
1907
1908 iov = &cmd->iov_misc[0];
1909 iov[niov].iov_base = ping_data;
1910 iov[niov++].iov_len = payload_length;
1911
1912 padding = ((-payload_length) & 3);
1913 if (padding != 0) {
1914 pr_debug("Receiving %u additional bytes"
1915 " for padding.\n", padding);
1916 iov[niov].iov_base = &cmd->pad_bytes;
1917 iov[niov++].iov_len = padding;
1918 rx_size += padding;
1919 }
1920 if (conn->conn_ops->DataDigest) {
1921 iov[niov].iov_base = &checksum;
1922 iov[niov++].iov_len = ISCSI_CRC_LEN;
1923 rx_size += ISCSI_CRC_LEN;
1924 }
1925
1926 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc));
1927 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1928 if (rx_got != rx_size) {
1929 ret = -1;
1930 goto out;
1931 }
1932
1933 if (conn->conn_ops->DataDigest) {
1934 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1935 payload_length, padding,
1936 cmd->pad_bytes, &data_crc);
1937
1938 if (checksum != data_crc) {
1939 pr_err("Ping data CRC32C DataDigest"
1940 " 0x%08x does not match computed 0x%08x\n",
1941 checksum, data_crc);
1942 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1943 pr_err("Unable to recover from"
1944 " NOPOUT Ping DataCRC failure while in"
1945 " ERL=0.\n");
1946 ret = -1;
1947 goto out;
1948 } else {
1949 /*
1950 * Silently drop this PDU and let the
1951 * initiator plug the CmdSN gap.
1952 */
1953 pr_debug("Dropping NOPOUT"
1954 " Command CmdSN: 0x%08x due to"
1955 " DataCRC error.\n", hdr->cmdsn);
1956 ret = 0;
1957 goto out;
1958 }
1959 } else {
1960 pr_debug("Got CRC32C DataDigest"
1961 " 0x%08x for %u bytes of ping data.\n",
1962 checksum, payload_length);
1963 }
1964 }
1965
1966 ping_data[payload_length] = '\0';
1967 /*
1968 * Attach ping data to struct iscsit_cmd->buf_ptr.
1969 */
1970 cmd->buf_ptr = ping_data;
1971 cmd->buf_ptr_size = payload_length;
1972
1973 pr_debug("Got %u bytes of NOPOUT ping"
1974 " data.\n", payload_length);
1975 pr_debug("Ping Data: \"%s\"\n", ping_data);
1976 }
1977
1978 return iscsit_process_nop_out(conn, cmd, hdr);
1979 out:
1980 if (cmd)
1981 iscsit_free_cmd(cmd, false);
1982
1983 kfree(ping_data);
1984 return ret;
1985 }
1986
iscsit_convert_tmf(u8 iscsi_tmf)1987 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1988 {
1989 switch (iscsi_tmf) {
1990 case ISCSI_TM_FUNC_ABORT_TASK:
1991 return TMR_ABORT_TASK;
1992 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1993 return TMR_ABORT_TASK_SET;
1994 case ISCSI_TM_FUNC_CLEAR_ACA:
1995 return TMR_CLEAR_ACA;
1996 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1997 return TMR_CLEAR_TASK_SET;
1998 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1999 return TMR_LUN_RESET;
2000 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2001 return TMR_TARGET_WARM_RESET;
2002 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2003 return TMR_TARGET_COLD_RESET;
2004 default:
2005 return TMR_UNKNOWN;
2006 }
2007 }
2008
2009 int
iscsit_handle_task_mgt_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)2010 iscsit_handle_task_mgt_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2011 unsigned char *buf)
2012 {
2013 struct se_tmr_req *se_tmr;
2014 struct iscsi_tmr_req *tmr_req;
2015 struct iscsi_tm *hdr;
2016 int out_of_order_cmdsn = 0, ret;
2017 u8 function, tcm_function = TMR_UNKNOWN;
2018
2019 hdr = (struct iscsi_tm *) buf;
2020 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2021 function = hdr->flags;
2022
2023 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
2024 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
2025 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
2026 hdr->rtt, hdr->refcmdsn, conn->cid);
2027
2028 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2029 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2030 hdr->rtt != RESERVED_ITT)) {
2031 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
2032 hdr->rtt = RESERVED_ITT;
2033 }
2034
2035 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
2036 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2037 pr_err("Task Management Request TASK_REASSIGN not"
2038 " issued as immediate command, bad iSCSI Initiator"
2039 "implementation\n");
2040 return iscsit_add_reject_cmd(cmd,
2041 ISCSI_REASON_PROTOCOL_ERROR, buf);
2042 }
2043 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2044 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
2045 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
2046
2047 cmd->data_direction = DMA_NONE;
2048 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
2049 if (!cmd->tmr_req) {
2050 return iscsit_add_reject_cmd(cmd,
2051 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2052 buf);
2053 }
2054
2055 __target_init_cmd(&cmd->se_cmd, &iscsi_ops,
2056 conn->sess->se_sess, 0, DMA_NONE,
2057 TCM_SIMPLE_TAG, cmd->sense_buffer + 2,
2058 scsilun_to_int(&hdr->lun),
2059 conn->cmd_cnt);
2060
2061 target_get_sess_cmd(&cmd->se_cmd, true);
2062
2063 /*
2064 * TASK_REASSIGN for ERL=2 / connection stays inside of
2065 * LIO-Target $FABRIC_MOD
2066 */
2067 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2068 tcm_function = iscsit_convert_tmf(function);
2069 if (tcm_function == TMR_UNKNOWN) {
2070 pr_err("Unknown iSCSI TMR Function:"
2071 " 0x%02x\n", function);
2072 return iscsit_add_reject_cmd(cmd,
2073 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2074 }
2075 }
2076 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2077 GFP_KERNEL);
2078 if (ret < 0)
2079 return iscsit_add_reject_cmd(cmd,
2080 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2081
2082 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2083
2084 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2085 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2086 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2087 cmd->init_task_tag = hdr->itt;
2088 cmd->targ_xfer_tag = 0xFFFFFFFF;
2089 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2090 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2091 se_tmr = cmd->se_cmd.se_tmr_req;
2092 tmr_req = cmd->tmr_req;
2093 /*
2094 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2095 */
2096 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2097 ret = transport_lookup_tmr_lun(&cmd->se_cmd);
2098 if (ret < 0) {
2099 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2100 goto attach;
2101 }
2102 }
2103
2104 switch (function) {
2105 case ISCSI_TM_FUNC_ABORT_TASK:
2106 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2107 if (se_tmr->response)
2108 goto attach;
2109 break;
2110 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2111 case ISCSI_TM_FUNC_CLEAR_ACA:
2112 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2113 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2114 break;
2115 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2116 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2117 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2118 goto attach;
2119 }
2120 break;
2121 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2122 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2123 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2124 goto attach;
2125 }
2126 break;
2127 case ISCSI_TM_FUNC_TASK_REASSIGN:
2128 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2129 /*
2130 * Perform sanity checks on the ExpDataSN only if the
2131 * TASK_REASSIGN was successful.
2132 */
2133 if (se_tmr->response)
2134 break;
2135
2136 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2137 return iscsit_add_reject_cmd(cmd,
2138 ISCSI_REASON_BOOKMARK_INVALID, buf);
2139 break;
2140 default:
2141 pr_err("Unknown TMR function: 0x%02x, protocol"
2142 " error.\n", function);
2143 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2144 goto attach;
2145 }
2146
2147 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2148 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2149 se_tmr->call_transport = 1;
2150 attach:
2151 spin_lock_bh(&conn->cmd_lock);
2152 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2153 spin_unlock_bh(&conn->cmd_lock);
2154
2155 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2156 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2157 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2158 out_of_order_cmdsn = 1;
2159 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2160 target_put_sess_cmd(&cmd->se_cmd);
2161 return 0;
2162 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2163 return -1;
2164 }
2165 }
2166 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2167
2168 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2169 return 0;
2170 /*
2171 * Found the referenced task, send to transport for processing.
2172 */
2173 if (se_tmr->call_transport)
2174 return transport_generic_handle_tmr(&cmd->se_cmd);
2175
2176 /*
2177 * Could not find the referenced LUN, task, or Task Management
2178 * command not authorized or supported. Change state and
2179 * let the tx_thread send the response.
2180 *
2181 * For connection recovery, this is also the default action for
2182 * TMR TASK_REASSIGN.
2183 */
2184 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2185 target_put_sess_cmd(&cmd->se_cmd);
2186 return 0;
2187 }
2188 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2189
2190 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2191 int
iscsit_setup_text_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_text * hdr)2192 iscsit_setup_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2193 struct iscsi_text *hdr)
2194 {
2195 u32 payload_length = ntoh24(hdr->dlength);
2196
2197 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2198 pr_err("Unable to accept text parameter length: %u"
2199 "greater than MaxXmitDataSegmentLength %u.\n",
2200 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2201 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2202 (unsigned char *)hdr);
2203 }
2204
2205 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2206 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2207 pr_err("Multi sequence text commands currently not supported\n");
2208 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2209 (unsigned char *)hdr);
2210 }
2211
2212 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2213 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2214 hdr->exp_statsn, payload_length);
2215
2216 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2217 cmd->i_state = ISTATE_SEND_TEXTRSP;
2218 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2219 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2220 cmd->targ_xfer_tag = 0xFFFFFFFF;
2221 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2222 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2223 cmd->data_direction = DMA_NONE;
2224 kfree(cmd->text_in_ptr);
2225 cmd->text_in_ptr = NULL;
2226
2227 return 0;
2228 }
2229 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2230
2231 int
iscsit_process_text_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_text * hdr)2232 iscsit_process_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2233 struct iscsi_text *hdr)
2234 {
2235 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2236 int cmdsn_ret;
2237
2238 if (!text_in) {
2239 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2240 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2241 pr_err("Unable to locate text_in buffer for sendtargets"
2242 " discovery\n");
2243 goto reject;
2244 }
2245 goto empty_sendtargets;
2246 }
2247 if (strncmp("SendTargets=", text_in, 12) != 0) {
2248 pr_err("Received Text Data that is not"
2249 " SendTargets, cannot continue.\n");
2250 goto reject;
2251 }
2252 /* '=' confirmed in strncmp */
2253 text_ptr = strchr(text_in, '=');
2254 BUG_ON(!text_ptr);
2255 if (!strncmp("=All", text_ptr, 5)) {
2256 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2257 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2258 !strncmp("=eui.", text_ptr, 5)) {
2259 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2260 } else {
2261 pr_err("Unable to locate valid SendTargets%s value\n",
2262 text_ptr);
2263 goto reject;
2264 }
2265
2266 spin_lock_bh(&conn->cmd_lock);
2267 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2268 spin_unlock_bh(&conn->cmd_lock);
2269
2270 empty_sendtargets:
2271 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2272
2273 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2274 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2275 (unsigned char *)hdr, hdr->cmdsn);
2276 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2277 return -1;
2278
2279 return 0;
2280 }
2281
2282 return iscsit_execute_cmd(cmd, 0);
2283
2284 reject:
2285 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2286 (unsigned char *)hdr);
2287 }
2288 EXPORT_SYMBOL(iscsit_process_text_cmd);
2289
2290 static int
iscsit_handle_text_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)2291 iscsit_handle_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2292 unsigned char *buf)
2293 {
2294 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2295 char *text_in = NULL;
2296 u32 payload_length = ntoh24(hdr->dlength);
2297 int rx_size, rc;
2298
2299 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2300 if (rc < 0)
2301 return 0;
2302
2303 rx_size = payload_length;
2304 if (payload_length) {
2305 u32 checksum = 0, data_crc = 0;
2306 u32 padding = 0;
2307 int niov = 0, rx_got;
2308 struct kvec iov[2];
2309
2310 rx_size = ALIGN(payload_length, 4);
2311 text_in = kzalloc(rx_size, GFP_KERNEL);
2312 if (!text_in)
2313 goto reject;
2314
2315 cmd->text_in_ptr = text_in;
2316
2317 memset(iov, 0, sizeof(iov));
2318 iov[niov].iov_base = text_in;
2319 iov[niov++].iov_len = rx_size;
2320
2321 padding = rx_size - payload_length;
2322 if (padding)
2323 pr_debug("Receiving %u additional bytes"
2324 " for padding.\n", padding);
2325 if (conn->conn_ops->DataDigest) {
2326 iov[niov].iov_base = &checksum;
2327 iov[niov++].iov_len = ISCSI_CRC_LEN;
2328 rx_size += ISCSI_CRC_LEN;
2329 }
2330
2331 WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
2332 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2333 if (rx_got != rx_size)
2334 goto reject;
2335
2336 if (conn->conn_ops->DataDigest) {
2337 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2338 text_in, rx_size, 0, NULL,
2339 &data_crc);
2340
2341 if (checksum != data_crc) {
2342 pr_err("Text data CRC32C DataDigest"
2343 " 0x%08x does not match computed"
2344 " 0x%08x\n", checksum, data_crc);
2345 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2346 pr_err("Unable to recover from"
2347 " Text Data digest failure while in"
2348 " ERL=0.\n");
2349 goto reject;
2350 } else {
2351 /*
2352 * Silently drop this PDU and let the
2353 * initiator plug the CmdSN gap.
2354 */
2355 pr_debug("Dropping Text"
2356 " Command CmdSN: 0x%08x due to"
2357 " DataCRC error.\n", hdr->cmdsn);
2358 kfree(text_in);
2359 return 0;
2360 }
2361 } else {
2362 pr_debug("Got CRC32C DataDigest"
2363 " 0x%08x for %u bytes of text data.\n",
2364 checksum, payload_length);
2365 }
2366 }
2367 text_in[payload_length - 1] = '\0';
2368 pr_debug("Successfully read %d bytes of text"
2369 " data.\n", payload_length);
2370 }
2371
2372 return iscsit_process_text_cmd(conn, cmd, hdr);
2373
2374 reject:
2375 kfree(cmd->text_in_ptr);
2376 cmd->text_in_ptr = NULL;
2377 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2378 }
2379
iscsit_logout_closesession(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2380 int iscsit_logout_closesession(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2381 {
2382 struct iscsit_conn *conn_p;
2383 struct iscsit_session *sess = conn->sess;
2384
2385 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2386 " for SID: %u.\n", conn->cid, conn->sess->sid);
2387
2388 atomic_set(&sess->session_logout, 1);
2389 atomic_set(&conn->conn_logout_remove, 1);
2390 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2391
2392 iscsit_inc_conn_usage_count(conn);
2393 iscsit_inc_session_usage_count(sess);
2394
2395 spin_lock_bh(&sess->conn_lock);
2396 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2397 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2398 continue;
2399
2400 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2401 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2402 }
2403 spin_unlock_bh(&sess->conn_lock);
2404
2405 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2406
2407 return 0;
2408 }
2409
iscsit_logout_closeconnection(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2410 int iscsit_logout_closeconnection(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2411 {
2412 struct iscsit_conn *l_conn;
2413 struct iscsit_session *sess = conn->sess;
2414
2415 pr_debug("Received logout request CLOSECONNECTION for CID:"
2416 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2417
2418 /*
2419 * A Logout Request with a CLOSECONNECTION reason code for a CID
2420 * can arrive on a connection with a differing CID.
2421 */
2422 if (conn->cid == cmd->logout_cid) {
2423 spin_lock_bh(&conn->state_lock);
2424 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2425 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2426
2427 atomic_set(&conn->conn_logout_remove, 1);
2428 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2429 iscsit_inc_conn_usage_count(conn);
2430
2431 spin_unlock_bh(&conn->state_lock);
2432 } else {
2433 /*
2434 * Handle all different cid CLOSECONNECTION requests in
2435 * iscsit_logout_post_handler_diffcid() as to give enough
2436 * time for any non immediate command's CmdSN to be
2437 * acknowledged on the connection in question.
2438 *
2439 * Here we simply make sure the CID is still around.
2440 */
2441 l_conn = iscsit_get_conn_from_cid(sess,
2442 cmd->logout_cid);
2443 if (!l_conn) {
2444 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2445 iscsit_add_cmd_to_response_queue(cmd, conn,
2446 cmd->i_state);
2447 return 0;
2448 }
2449
2450 iscsit_dec_conn_usage_count(l_conn);
2451 }
2452
2453 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2454
2455 return 0;
2456 }
2457
iscsit_logout_removeconnforrecovery(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2458 int iscsit_logout_removeconnforrecovery(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2459 {
2460 struct iscsit_session *sess = conn->sess;
2461
2462 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2463 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2464
2465 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2466 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2467 " while ERL!=2.\n");
2468 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2469 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2470 return 0;
2471 }
2472
2473 if (conn->cid == cmd->logout_cid) {
2474 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2475 " with CID: %hu on CID: %hu, implementation error.\n",
2476 cmd->logout_cid, conn->cid);
2477 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2478 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2479 return 0;
2480 }
2481
2482 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2483
2484 return 0;
2485 }
2486
2487 int
iscsit_handle_logout_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)2488 iscsit_handle_logout_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2489 unsigned char *buf)
2490 {
2491 int cmdsn_ret, logout_remove = 0;
2492 u8 reason_code = 0;
2493 struct iscsi_logout *hdr;
2494 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2495
2496 hdr = (struct iscsi_logout *) buf;
2497 reason_code = (hdr->flags & 0x7f);
2498
2499 if (tiqn) {
2500 spin_lock(&tiqn->logout_stats.lock);
2501 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2502 tiqn->logout_stats.normal_logouts++;
2503 else
2504 tiqn->logout_stats.abnormal_logouts++;
2505 spin_unlock(&tiqn->logout_stats.lock);
2506 }
2507
2508 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2509 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2510 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2511 hdr->cid, conn->cid);
2512
2513 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2514 pr_err("Received logout request on connection that"
2515 " is not in logged in state, ignoring request.\n");
2516 iscsit_free_cmd(cmd, false);
2517 return 0;
2518 }
2519
2520 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2521 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2522 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2523 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2524 cmd->targ_xfer_tag = 0xFFFFFFFF;
2525 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2526 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2527 cmd->logout_cid = be16_to_cpu(hdr->cid);
2528 cmd->logout_reason = reason_code;
2529 cmd->data_direction = DMA_NONE;
2530
2531 /*
2532 * We need to sleep in these cases (by returning 1) until the Logout
2533 * Response gets sent in the tx thread.
2534 */
2535 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2536 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2537 be16_to_cpu(hdr->cid) == conn->cid))
2538 logout_remove = 1;
2539
2540 spin_lock_bh(&conn->cmd_lock);
2541 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2542 spin_unlock_bh(&conn->cmd_lock);
2543
2544 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2545 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2546
2547 /*
2548 * Immediate commands are executed, well, immediately.
2549 * Non-Immediate Logout Commands are executed in CmdSN order.
2550 */
2551 if (cmd->immediate_cmd) {
2552 int ret = iscsit_execute_cmd(cmd, 0);
2553
2554 if (ret < 0)
2555 return ret;
2556 } else {
2557 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2558 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2559 logout_remove = 0;
2560 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2561 return -1;
2562 }
2563
2564 return logout_remove;
2565 }
2566 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2567
iscsit_handle_snack(struct iscsit_conn * conn,unsigned char * buf)2568 int iscsit_handle_snack(
2569 struct iscsit_conn *conn,
2570 unsigned char *buf)
2571 {
2572 struct iscsi_snack *hdr;
2573
2574 hdr = (struct iscsi_snack *) buf;
2575 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2576
2577 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2578 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2579 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2580 hdr->begrun, hdr->runlength, conn->cid);
2581
2582 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2583 pr_err("Initiator sent SNACK request while in"
2584 " ErrorRecoveryLevel=0.\n");
2585 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2586 buf);
2587 }
2588 /*
2589 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2590 * call from inside iscsi_send_recovery_datain_or_r2t().
2591 */
2592 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2593 case 0:
2594 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2595 hdr->itt,
2596 be32_to_cpu(hdr->ttt),
2597 be32_to_cpu(hdr->begrun),
2598 be32_to_cpu(hdr->runlength));
2599 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2600 return iscsit_handle_status_snack(conn, hdr->itt,
2601 be32_to_cpu(hdr->ttt),
2602 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2603 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2604 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2605 be32_to_cpu(hdr->begrun),
2606 be32_to_cpu(hdr->runlength));
2607 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2608 /* FIXME: Support R-Data SNACK */
2609 pr_err("R-Data SNACK Not Supported.\n");
2610 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2611 buf);
2612 default:
2613 pr_err("Unknown SNACK type 0x%02x, protocol"
2614 " error.\n", hdr->flags & 0x0f);
2615 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2616 buf);
2617 }
2618
2619 return 0;
2620 }
2621 EXPORT_SYMBOL(iscsit_handle_snack);
2622
iscsit_rx_thread_wait_for_tcp(struct iscsit_conn * conn)2623 static void iscsit_rx_thread_wait_for_tcp(struct iscsit_conn *conn)
2624 {
2625 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2626 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2627 wait_for_completion_interruptible_timeout(
2628 &conn->rx_half_close_comp,
2629 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2630 }
2631 }
2632
iscsit_handle_immediate_data(struct iscsit_cmd * cmd,struct iscsi_scsi_req * hdr,u32 length)2633 static int iscsit_handle_immediate_data(
2634 struct iscsit_cmd *cmd,
2635 struct iscsi_scsi_req *hdr,
2636 u32 length)
2637 {
2638 int iov_ret, rx_got = 0, rx_size = 0;
2639 u32 checksum, iov_count = 0, padding = 0;
2640 struct iscsit_conn *conn = cmd->conn;
2641 struct kvec *iov;
2642 void *overflow_buf = NULL;
2643
2644 BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
2645 rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
2646 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
2647 cmd->orig_iov_data_count - 2,
2648 cmd->write_data_done, rx_size);
2649 if (iov_ret < 0)
2650 return IMMEDIATE_DATA_CANNOT_RECOVER;
2651
2652 iov_count = iov_ret;
2653 iov = &cmd->iov_data[0];
2654 if (rx_size < length) {
2655 /*
2656 * Special case: length of immediate data exceeds the data
2657 * buffer size derived from the CDB.
2658 */
2659 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
2660 if (!overflow_buf) {
2661 iscsit_unmap_iovec(cmd);
2662 return IMMEDIATE_DATA_CANNOT_RECOVER;
2663 }
2664 cmd->overflow_buf = overflow_buf;
2665 iov[iov_count].iov_base = overflow_buf;
2666 iov[iov_count].iov_len = length - rx_size;
2667 iov_count++;
2668 rx_size = length;
2669 }
2670
2671 padding = ((-length) & 3);
2672 if (padding != 0) {
2673 iov[iov_count].iov_base = cmd->pad_bytes;
2674 iov[iov_count++].iov_len = padding;
2675 rx_size += padding;
2676 }
2677
2678 if (conn->conn_ops->DataDigest) {
2679 iov[iov_count].iov_base = &checksum;
2680 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2681 rx_size += ISCSI_CRC_LEN;
2682 }
2683
2684 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
2685 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2686
2687 iscsit_unmap_iovec(cmd);
2688
2689 if (rx_got != rx_size) {
2690 iscsit_rx_thread_wait_for_tcp(conn);
2691 return IMMEDIATE_DATA_CANNOT_RECOVER;
2692 }
2693
2694 if (conn->conn_ops->DataDigest) {
2695 u32 data_crc;
2696
2697 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2698 cmd->write_data_done, length, padding,
2699 cmd->pad_bytes);
2700
2701 if (checksum != data_crc) {
2702 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2703 " does not match computed 0x%08x\n", checksum,
2704 data_crc);
2705
2706 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2707 pr_err("Unable to recover from"
2708 " Immediate Data digest failure while"
2709 " in ERL=0.\n");
2710 iscsit_reject_cmd(cmd,
2711 ISCSI_REASON_DATA_DIGEST_ERROR,
2712 (unsigned char *)hdr);
2713 return IMMEDIATE_DATA_CANNOT_RECOVER;
2714 } else {
2715 iscsit_reject_cmd(cmd,
2716 ISCSI_REASON_DATA_DIGEST_ERROR,
2717 (unsigned char *)hdr);
2718 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2719 }
2720 } else {
2721 pr_debug("Got CRC32C DataDigest 0x%08x for"
2722 " %u bytes of Immediate Data\n", checksum,
2723 length);
2724 }
2725 }
2726
2727 cmd->write_data_done += length;
2728
2729 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2730 spin_lock_bh(&cmd->istate_lock);
2731 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2732 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2733 spin_unlock_bh(&cmd->istate_lock);
2734 }
2735
2736 return IMMEDIATE_DATA_NORMAL_OPERATION;
2737 }
2738
2739 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2740 with active network interface */
iscsit_build_conn_drop_async_message(struct iscsit_conn * conn)2741 static void iscsit_build_conn_drop_async_message(struct iscsit_conn *conn)
2742 {
2743 struct iscsit_cmd *cmd;
2744 struct iscsit_conn *conn_p;
2745 bool found = false;
2746
2747 lockdep_assert_held(&conn->sess->conn_lock);
2748
2749 /*
2750 * Only send a Asynchronous Message on connections whos network
2751 * interface is still functional.
2752 */
2753 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2754 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2755 iscsit_inc_conn_usage_count(conn_p);
2756 found = true;
2757 break;
2758 }
2759 }
2760
2761 if (!found)
2762 return;
2763
2764 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2765 if (!cmd) {
2766 iscsit_dec_conn_usage_count(conn_p);
2767 return;
2768 }
2769
2770 cmd->logout_cid = conn->cid;
2771 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2772 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2773
2774 spin_lock_bh(&conn_p->cmd_lock);
2775 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2776 spin_unlock_bh(&conn_p->cmd_lock);
2777
2778 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2779 iscsit_dec_conn_usage_count(conn_p);
2780 }
2781
iscsit_send_conn_drop_async_message(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2782 static int iscsit_send_conn_drop_async_message(
2783 struct iscsit_cmd *cmd,
2784 struct iscsit_conn *conn)
2785 {
2786 struct iscsi_async *hdr;
2787
2788 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2789
2790 hdr = (struct iscsi_async *) cmd->pdu;
2791 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2792 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2793 cmd->init_task_tag = RESERVED_ITT;
2794 cmd->targ_xfer_tag = 0xFFFFFFFF;
2795 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2796 cmd->stat_sn = conn->stat_sn++;
2797 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2798 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2799 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2800 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2801 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2802 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2803 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2804
2805 pr_debug("Sending Connection Dropped Async Message StatSN:"
2806 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2807 cmd->logout_cid, conn->cid);
2808
2809 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2810 }
2811
iscsit_tx_thread_wait_for_tcp(struct iscsit_conn * conn)2812 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *conn)
2813 {
2814 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2815 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2816 wait_for_completion_interruptible_timeout(
2817 &conn->tx_half_close_comp,
2818 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2819 }
2820 }
2821
2822 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)2823 iscsit_build_datain_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2824 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2825 bool set_statsn)
2826 {
2827 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2828 hdr->flags = datain->flags;
2829 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2830 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2831 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2832 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2833 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2834 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2835 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2836 }
2837 }
2838 hton24(hdr->dlength, datain->length);
2839 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2840 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2841 (struct scsi_lun *)&hdr->lun);
2842 else
2843 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2844
2845 hdr->itt = cmd->init_task_tag;
2846
2847 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2848 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2849 else
2850 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2851 if (set_statsn)
2852 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2853 else
2854 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2855
2856 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2857 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2858 hdr->datasn = cpu_to_be32(datain->data_sn);
2859 hdr->offset = cpu_to_be32(datain->offset);
2860
2861 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2862 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2863 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2864 ntohl(hdr->offset), datain->length, conn->cid);
2865 }
2866 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2867
iscsit_send_datain(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2868 static int iscsit_send_datain(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2869 {
2870 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2871 struct iscsi_datain datain;
2872 struct iscsi_datain_req *dr;
2873 int eodr = 0, ret;
2874 bool set_statsn = false;
2875
2876 memset(&datain, 0, sizeof(struct iscsi_datain));
2877 dr = iscsit_get_datain_values(cmd, &datain);
2878 if (!dr) {
2879 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2880 cmd->init_task_tag);
2881 return -1;
2882 }
2883 /*
2884 * Be paranoid and double check the logic for now.
2885 */
2886 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2887 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2888 " datain.length: %u exceeds cmd->data_length: %u\n",
2889 cmd->init_task_tag, datain.offset, datain.length,
2890 cmd->se_cmd.data_length);
2891 return -1;
2892 }
2893
2894 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2895 /*
2896 * Special case for successfully execution w/ both DATAIN
2897 * and Sense Data.
2898 */
2899 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2900 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2901 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2902 else {
2903 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2904 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2905 iscsit_increment_maxcmdsn(cmd, conn->sess);
2906 cmd->stat_sn = conn->stat_sn++;
2907 set_statsn = true;
2908 } else if (dr->dr_complete ==
2909 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2910 set_statsn = true;
2911 }
2912
2913 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2914
2915 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2916 if (ret < 0)
2917 return ret;
2918
2919 if (dr->dr_complete) {
2920 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2921 2 : 1;
2922 iscsit_free_datain_req(cmd, dr);
2923 }
2924
2925 return eodr;
2926 }
2927
2928 int
iscsit_build_logout_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_logout_rsp * hdr)2929 iscsit_build_logout_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2930 struct iscsi_logout_rsp *hdr)
2931 {
2932 struct iscsit_conn *logout_conn = NULL;
2933 struct iscsi_conn_recovery *cr = NULL;
2934 struct iscsit_session *sess = conn->sess;
2935 /*
2936 * The actual shutting down of Sessions and/or Connections
2937 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2938 * is done in scsi_logout_post_handler().
2939 */
2940 switch (cmd->logout_reason) {
2941 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2942 pr_debug("iSCSI session logout successful, setting"
2943 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2944 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2945 break;
2946 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2947 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2948 break;
2949 /*
2950 * For CLOSECONNECTION logout requests carrying
2951 * a matching logout CID -> local CID, the reference
2952 * for the local CID will have been incremented in
2953 * iscsi_logout_closeconnection().
2954 *
2955 * For CLOSECONNECTION logout requests carrying
2956 * a different CID than the connection it arrived
2957 * on, the connection responding to cmd->logout_cid
2958 * is stopped in iscsit_logout_post_handler_diffcid().
2959 */
2960
2961 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2962 " successful.\n", cmd->logout_cid, conn->cid);
2963 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2964 break;
2965 case ISCSI_LOGOUT_REASON_RECOVERY:
2966 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2967 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2968 break;
2969 /*
2970 * If the connection is still active from our point of view
2971 * force connection recovery to occur.
2972 */
2973 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2974 cmd->logout_cid);
2975 if (logout_conn) {
2976 iscsit_connection_reinstatement_rcfr(logout_conn);
2977 iscsit_dec_conn_usage_count(logout_conn);
2978 }
2979
2980 cr = iscsit_get_inactive_connection_recovery_entry(
2981 conn->sess, cmd->logout_cid);
2982 if (!cr) {
2983 pr_err("Unable to locate CID: %hu for"
2984 " REMOVECONNFORRECOVERY Logout Request.\n",
2985 cmd->logout_cid);
2986 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2987 break;
2988 }
2989
2990 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2991
2992 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2993 " for recovery for CID: %hu on CID: %hu successful.\n",
2994 cmd->logout_cid, conn->cid);
2995 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2996 break;
2997 default:
2998 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2999 cmd->logout_reason);
3000 return -1;
3001 }
3002
3003 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
3004 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3005 hdr->response = cmd->logout_response;
3006 hdr->itt = cmd->init_task_tag;
3007 cmd->stat_sn = conn->stat_sn++;
3008 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3009
3010 iscsit_increment_maxcmdsn(cmd, conn->sess);
3011 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3012 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3013
3014 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
3015 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
3016 cmd->init_task_tag, cmd->stat_sn, hdr->response,
3017 cmd->logout_cid, conn->cid);
3018
3019 return 0;
3020 }
3021 EXPORT_SYMBOL(iscsit_build_logout_rsp);
3022
3023 static int
iscsit_send_logout(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3024 iscsit_send_logout(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3025 {
3026 int rc;
3027
3028 rc = iscsit_build_logout_rsp(cmd, conn,
3029 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
3030 if (rc < 0)
3031 return rc;
3032
3033 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3034 }
3035
3036 void
iscsit_build_nopin_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_nopin * hdr,bool nopout_response)3037 iscsit_build_nopin_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3038 struct iscsi_nopin *hdr, bool nopout_response)
3039 {
3040 hdr->opcode = ISCSI_OP_NOOP_IN;
3041 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3042 hton24(hdr->dlength, cmd->buf_ptr_size);
3043 if (nopout_response)
3044 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
3045 hdr->itt = cmd->init_task_tag;
3046 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3047 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
3048 conn->stat_sn;
3049 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3050
3051 if (nopout_response)
3052 iscsit_increment_maxcmdsn(cmd, conn->sess);
3053
3054 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3055 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3056
3057 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3058 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3059 "Solicited" : "Unsolicited", cmd->init_task_tag,
3060 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3061 }
3062 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3063
3064 /*
3065 * Unsolicited NOPIN, either requesting a response or not.
3066 */
iscsit_send_unsolicited_nopin(struct iscsit_cmd * cmd,struct iscsit_conn * conn,int want_response)3067 static int iscsit_send_unsolicited_nopin(
3068 struct iscsit_cmd *cmd,
3069 struct iscsit_conn *conn,
3070 int want_response)
3071 {
3072 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3073 int ret;
3074
3075 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3076
3077 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3078 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3079
3080 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3081 if (ret < 0)
3082 return ret;
3083
3084 spin_lock_bh(&cmd->istate_lock);
3085 cmd->i_state = want_response ?
3086 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3087 spin_unlock_bh(&cmd->istate_lock);
3088
3089 return 0;
3090 }
3091
3092 static int
iscsit_send_nopin(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3093 iscsit_send_nopin(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3094 {
3095 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3096
3097 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3098
3099 /*
3100 * NOPOUT Ping Data is attached to struct iscsit_cmd->buf_ptr.
3101 * NOPOUT DataSegmentLength is at struct iscsit_cmd->buf_ptr_size.
3102 */
3103 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3104
3105 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3106 cmd->buf_ptr,
3107 cmd->buf_ptr_size);
3108 }
3109
iscsit_send_r2t(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3110 static int iscsit_send_r2t(
3111 struct iscsit_cmd *cmd,
3112 struct iscsit_conn *conn)
3113 {
3114 struct iscsi_r2t *r2t;
3115 struct iscsi_r2t_rsp *hdr;
3116 int ret;
3117
3118 r2t = iscsit_get_r2t_from_list(cmd);
3119 if (!r2t)
3120 return -1;
3121
3122 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3123 memset(hdr, 0, ISCSI_HDR_LEN);
3124 hdr->opcode = ISCSI_OP_R2T;
3125 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3126 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3127 (struct scsi_lun *)&hdr->lun);
3128 hdr->itt = cmd->init_task_tag;
3129 if (conn->conn_transport->iscsit_get_r2t_ttt)
3130 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3131 else
3132 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3133 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3134 hdr->statsn = cpu_to_be32(conn->stat_sn);
3135 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3136 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3137 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3138 hdr->data_offset = cpu_to_be32(r2t->offset);
3139 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3140
3141 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3142 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3143 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3144 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3145 r2t->offset, r2t->xfer_len, conn->cid);
3146
3147 spin_lock_bh(&cmd->r2t_lock);
3148 r2t->sent_r2t = 1;
3149 spin_unlock_bh(&cmd->r2t_lock);
3150
3151 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3152 if (ret < 0) {
3153 return ret;
3154 }
3155
3156 spin_lock_bh(&cmd->dataout_timeout_lock);
3157 iscsit_start_dataout_timer(cmd, conn);
3158 spin_unlock_bh(&cmd->dataout_timeout_lock);
3159
3160 return 0;
3161 }
3162
3163 /*
3164 * @recovery: If called from iscsi_task_reassign_complete_write() for
3165 * connection recovery.
3166 */
iscsit_build_r2ts_for_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,bool recovery)3167 int iscsit_build_r2ts_for_cmd(
3168 struct iscsit_conn *conn,
3169 struct iscsit_cmd *cmd,
3170 bool recovery)
3171 {
3172 int first_r2t = 1;
3173 u32 offset = 0, xfer_len = 0;
3174
3175 spin_lock_bh(&cmd->r2t_lock);
3176 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3177 spin_unlock_bh(&cmd->r2t_lock);
3178 return 0;
3179 }
3180
3181 if (conn->sess->sess_ops->DataSequenceInOrder &&
3182 !recovery)
3183 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3184
3185 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3186 if (conn->sess->sess_ops->DataSequenceInOrder) {
3187 offset = cmd->r2t_offset;
3188
3189 if (first_r2t && recovery) {
3190 int new_data_end = offset +
3191 conn->sess->sess_ops->MaxBurstLength -
3192 cmd->next_burst_len;
3193
3194 if (new_data_end > cmd->se_cmd.data_length)
3195 xfer_len = cmd->se_cmd.data_length - offset;
3196 else
3197 xfer_len =
3198 conn->sess->sess_ops->MaxBurstLength -
3199 cmd->next_burst_len;
3200 } else {
3201 int new_data_end = offset +
3202 conn->sess->sess_ops->MaxBurstLength;
3203
3204 if (new_data_end > cmd->se_cmd.data_length)
3205 xfer_len = cmd->se_cmd.data_length - offset;
3206 else
3207 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3208 }
3209
3210 if ((s32)xfer_len < 0) {
3211 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3212 break;
3213 }
3214
3215 cmd->r2t_offset += xfer_len;
3216
3217 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3218 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3219 } else {
3220 struct iscsi_seq *seq;
3221
3222 seq = iscsit_get_seq_holder_for_r2t(cmd);
3223 if (!seq) {
3224 spin_unlock_bh(&cmd->r2t_lock);
3225 return -1;
3226 }
3227
3228 offset = seq->offset;
3229 xfer_len = seq->xfer_len;
3230
3231 if (cmd->seq_send_order == cmd->seq_count)
3232 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3233 }
3234 cmd->outstanding_r2ts++;
3235 first_r2t = 0;
3236
3237 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3238 spin_unlock_bh(&cmd->r2t_lock);
3239 return -1;
3240 }
3241
3242 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3243 break;
3244 }
3245 spin_unlock_bh(&cmd->r2t_lock);
3246
3247 return 0;
3248 }
3249 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3250
iscsit_build_rsp_pdu(struct iscsit_cmd * cmd,struct iscsit_conn * conn,bool inc_stat_sn,struct iscsi_scsi_rsp * hdr)3251 void iscsit_build_rsp_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3252 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3253 {
3254 if (inc_stat_sn)
3255 cmd->stat_sn = conn->stat_sn++;
3256
3257 atomic_long_inc(&conn->sess->rsp_pdus);
3258
3259 memset(hdr, 0, ISCSI_HDR_LEN);
3260 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3261 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3262 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3263 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3264 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3265 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3266 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3267 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3268 }
3269 hdr->response = cmd->iscsi_response;
3270 hdr->cmd_status = cmd->se_cmd.scsi_status;
3271 hdr->itt = cmd->init_task_tag;
3272 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3273
3274 iscsit_increment_maxcmdsn(cmd, conn->sess);
3275 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3276 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3277
3278 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3279 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3280 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3281 cmd->se_cmd.scsi_status, conn->cid);
3282 }
3283 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3284
iscsit_send_response(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3285 static int iscsit_send_response(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3286 {
3287 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3288 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3289 void *data_buf = NULL;
3290 u32 padding = 0, data_buf_len = 0;
3291
3292 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3293
3294 /*
3295 * Attach SENSE DATA payload to iSCSI Response PDU
3296 */
3297 if (cmd->se_cmd.sense_buffer &&
3298 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3299 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3300 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3301 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3302
3303 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3304 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3305 data_buf = cmd->sense_buffer;
3306 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3307
3308 if (padding) {
3309 memset(cmd->sense_buffer +
3310 cmd->se_cmd.scsi_sense_length, 0, padding);
3311 pr_debug("Adding %u bytes of padding to"
3312 " SENSE.\n", padding);
3313 }
3314
3315 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3316 " Response PDU\n",
3317 cmd->se_cmd.scsi_sense_length);
3318 }
3319
3320 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3321 data_buf_len);
3322 }
3323
iscsit_convert_tcm_tmr_rsp(struct se_tmr_req * se_tmr)3324 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3325 {
3326 switch (se_tmr->response) {
3327 case TMR_FUNCTION_COMPLETE:
3328 return ISCSI_TMF_RSP_COMPLETE;
3329 case TMR_TASK_DOES_NOT_EXIST:
3330 return ISCSI_TMF_RSP_NO_TASK;
3331 case TMR_LUN_DOES_NOT_EXIST:
3332 return ISCSI_TMF_RSP_NO_LUN;
3333 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3334 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3335 case TMR_FUNCTION_REJECTED:
3336 default:
3337 return ISCSI_TMF_RSP_REJECTED;
3338 }
3339 }
3340
3341 void
iscsit_build_task_mgt_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_tm_rsp * hdr)3342 iscsit_build_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3343 struct iscsi_tm_rsp *hdr)
3344 {
3345 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3346
3347 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3348 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3349 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3350 hdr->itt = cmd->init_task_tag;
3351 cmd->stat_sn = conn->stat_sn++;
3352 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3353
3354 iscsit_increment_maxcmdsn(cmd, conn->sess);
3355 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3356 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3357
3358 pr_debug("Built Task Management Response ITT: 0x%08x,"
3359 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3360 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3361 }
3362 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3363
3364 static int
iscsit_send_task_mgt_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3365 iscsit_send_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3366 {
3367 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3368
3369 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3370
3371 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3372 }
3373
3374 #define SENDTARGETS_BUF_LIMIT 32768U
3375
3376 static int
iscsit_build_sendtargets_response(struct iscsit_cmd * cmd,enum iscsit_transport_type network_transport,int skip_bytes,bool * completed)3377 iscsit_build_sendtargets_response(struct iscsit_cmd *cmd,
3378 enum iscsit_transport_type network_transport,
3379 int skip_bytes, bool *completed)
3380 {
3381 char *payload = NULL;
3382 struct iscsit_conn *conn = cmd->conn;
3383 struct iscsi_portal_group *tpg;
3384 struct iscsi_tiqn *tiqn;
3385 struct iscsi_tpg_np *tpg_np;
3386 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3387 int target_name_printed;
3388 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3389 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3390 bool active;
3391
3392 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3393 SENDTARGETS_BUF_LIMIT);
3394
3395 payload = kzalloc(buffer_len, GFP_KERNEL);
3396 if (!payload)
3397 return -ENOMEM;
3398
3399 /*
3400 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3401 * explicit case..
3402 */
3403 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3404 text_ptr = strchr(text_in, '=');
3405 if (!text_ptr) {
3406 pr_err("Unable to locate '=' string in text_in:"
3407 " %s\n", text_in);
3408 kfree(payload);
3409 return -EINVAL;
3410 }
3411 /*
3412 * Skip over '=' character..
3413 */
3414 text_ptr += 1;
3415 }
3416
3417 spin_lock(&tiqn_lock);
3418 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3419 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3420 strcmp(tiqn->tiqn, text_ptr)) {
3421 continue;
3422 }
3423
3424 target_name_printed = 0;
3425
3426 spin_lock(&tiqn->tiqn_tpg_lock);
3427 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3428
3429 /* If demo_mode_discovery=0 and generate_node_acls=0
3430 * (demo mode dislabed) do not return
3431 * TargetName+TargetAddress unless a NodeACL exists.
3432 */
3433
3434 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3435 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3436 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3437 cmd->conn->sess->sess_ops->InitiatorName))) {
3438 continue;
3439 }
3440
3441 spin_lock(&tpg->tpg_state_lock);
3442 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3443 spin_unlock(&tpg->tpg_state_lock);
3444
3445 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3446 continue;
3447
3448 spin_lock(&tpg->tpg_np_lock);
3449 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3450 tpg_np_list) {
3451 struct iscsi_np *np = tpg_np->tpg_np;
3452 struct sockaddr_storage *sockaddr;
3453
3454 if (np->np_network_transport != network_transport)
3455 continue;
3456
3457 if (!target_name_printed) {
3458 len = sprintf(buf, "TargetName=%s",
3459 tiqn->tiqn);
3460 len += 1;
3461
3462 if ((len + payload_len) > buffer_len) {
3463 spin_unlock(&tpg->tpg_np_lock);
3464 spin_unlock(&tiqn->tiqn_tpg_lock);
3465 end_of_buf = 1;
3466 goto eob;
3467 }
3468
3469 if (skip_bytes && len <= skip_bytes) {
3470 skip_bytes -= len;
3471 } else {
3472 memcpy(payload + payload_len, buf, len);
3473 payload_len += len;
3474 target_name_printed = 1;
3475 if (len > skip_bytes)
3476 skip_bytes = 0;
3477 }
3478 }
3479
3480 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3481 sockaddr = &conn->local_sockaddr;
3482 else
3483 sockaddr = &np->np_sockaddr;
3484
3485 len = sprintf(buf, "TargetAddress="
3486 "%pISpc,%hu",
3487 sockaddr,
3488 tpg->tpgt);
3489 len += 1;
3490
3491 if ((len + payload_len) > buffer_len) {
3492 spin_unlock(&tpg->tpg_np_lock);
3493 spin_unlock(&tiqn->tiqn_tpg_lock);
3494 end_of_buf = 1;
3495 goto eob;
3496 }
3497
3498 if (skip_bytes && len <= skip_bytes) {
3499 skip_bytes -= len;
3500 } else {
3501 memcpy(payload + payload_len, buf, len);
3502 payload_len += len;
3503 if (len > skip_bytes)
3504 skip_bytes = 0;
3505 }
3506 }
3507 spin_unlock(&tpg->tpg_np_lock);
3508 }
3509 spin_unlock(&tiqn->tiqn_tpg_lock);
3510 eob:
3511 if (end_of_buf) {
3512 *completed = false;
3513 break;
3514 }
3515
3516 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3517 break;
3518 }
3519 spin_unlock(&tiqn_lock);
3520
3521 cmd->buf_ptr = payload;
3522
3523 return payload_len;
3524 }
3525
3526 int
iscsit_build_text_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_text_rsp * hdr,enum iscsit_transport_type network_transport)3527 iscsit_build_text_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3528 struct iscsi_text_rsp *hdr,
3529 enum iscsit_transport_type network_transport)
3530 {
3531 int text_length, padding;
3532 bool completed = true;
3533
3534 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3535 cmd->read_data_done,
3536 &completed);
3537 if (text_length < 0)
3538 return text_length;
3539
3540 if (completed) {
3541 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3542 } else {
3543 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3544 cmd->read_data_done += text_length;
3545 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3546 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3547 }
3548 hdr->opcode = ISCSI_OP_TEXT_RSP;
3549 padding = ((-text_length) & 3);
3550 hton24(hdr->dlength, text_length);
3551 hdr->itt = cmd->init_task_tag;
3552 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3553 cmd->stat_sn = conn->stat_sn++;
3554 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3555
3556 iscsit_increment_maxcmdsn(cmd, conn->sess);
3557 /*
3558 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3559 * correctly increment MaxCmdSN for each response answering a
3560 * non immediate text request with a valid CmdSN.
3561 */
3562 cmd->maxcmdsn_inc = 0;
3563 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3564 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3565
3566 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3567 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3568 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3569 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3570 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3571
3572 return text_length + padding;
3573 }
3574 EXPORT_SYMBOL(iscsit_build_text_rsp);
3575
iscsit_send_text_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3576 static int iscsit_send_text_rsp(
3577 struct iscsit_cmd *cmd,
3578 struct iscsit_conn *conn)
3579 {
3580 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3581 int text_length;
3582
3583 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3584 conn->conn_transport->transport_type);
3585 if (text_length < 0)
3586 return text_length;
3587
3588 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3589 cmd->buf_ptr,
3590 text_length);
3591 }
3592
3593 void
iscsit_build_reject(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_reject * hdr)3594 iscsit_build_reject(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3595 struct iscsi_reject *hdr)
3596 {
3597 hdr->opcode = ISCSI_OP_REJECT;
3598 hdr->reason = cmd->reject_reason;
3599 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3600 hton24(hdr->dlength, ISCSI_HDR_LEN);
3601 hdr->ffffffff = cpu_to_be32(0xffffffff);
3602 cmd->stat_sn = conn->stat_sn++;
3603 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3604 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3605 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3606
3607 }
3608 EXPORT_SYMBOL(iscsit_build_reject);
3609
iscsit_send_reject(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3610 static int iscsit_send_reject(
3611 struct iscsit_cmd *cmd,
3612 struct iscsit_conn *conn)
3613 {
3614 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3615
3616 iscsit_build_reject(cmd, conn, hdr);
3617
3618 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3619 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3620
3621 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3622 cmd->buf_ptr,
3623 ISCSI_HDR_LEN);
3624 }
3625
iscsit_thread_get_cpumask(struct iscsit_conn * conn)3626 void iscsit_thread_get_cpumask(struct iscsit_conn *conn)
3627 {
3628 int ord, cpu;
3629 cpumask_var_t conn_allowed_cpumask;
3630
3631 /*
3632 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3633 * within iscsit_start_kthreads()
3634 *
3635 * Here we use bitmap_id to determine which CPU that this
3636 * iSCSI connection's RX/TX threads will be scheduled to
3637 * execute upon.
3638 */
3639 if (!zalloc_cpumask_var(&conn_allowed_cpumask, GFP_KERNEL)) {
3640 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3641 for_each_online_cpu(cpu) {
3642 if (ord-- == 0) {
3643 cpumask_set_cpu(cpu, conn->conn_cpumask);
3644 return;
3645 }
3646 }
3647 } else {
3648 cpumask_and(conn_allowed_cpumask, iscsit_global->allowed_cpumask,
3649 cpu_online_mask);
3650
3651 cpumask_clear(conn->conn_cpumask);
3652 ord = conn->bitmap_id % cpumask_weight(conn_allowed_cpumask);
3653 for_each_cpu(cpu, conn_allowed_cpumask) {
3654 if (ord-- == 0) {
3655 cpumask_set_cpu(cpu, conn->conn_cpumask);
3656 free_cpumask_var(conn_allowed_cpumask);
3657 return;
3658 }
3659 }
3660 free_cpumask_var(conn_allowed_cpumask);
3661 }
3662 /*
3663 * This should never be reached..
3664 */
3665 dump_stack();
3666 cpumask_setall(conn->conn_cpumask);
3667 }
3668
iscsit_thread_reschedule(struct iscsit_conn * conn)3669 static void iscsit_thread_reschedule(struct iscsit_conn *conn)
3670 {
3671 /*
3672 * If iscsit_global->allowed_cpumask modified, reschedule iSCSI
3673 * connection's RX/TX threads update conn->allowed_cpumask.
3674 */
3675 if (!cpumask_equal(iscsit_global->allowed_cpumask,
3676 conn->allowed_cpumask)) {
3677 iscsit_thread_get_cpumask(conn);
3678 conn->conn_tx_reset_cpumask = 1;
3679 conn->conn_rx_reset_cpumask = 1;
3680 cpumask_copy(conn->allowed_cpumask,
3681 iscsit_global->allowed_cpumask);
3682 }
3683 }
3684
iscsit_thread_check_cpumask(struct iscsit_conn * conn,struct task_struct * p,int mode)3685 void iscsit_thread_check_cpumask(
3686 struct iscsit_conn *conn,
3687 struct task_struct *p,
3688 int mode)
3689 {
3690 /*
3691 * The TX and RX threads maybe call iscsit_thread_check_cpumask()
3692 * at the same time. The RX thread might be faster and return from
3693 * iscsit_thread_reschedule() with conn_rx_reset_cpumask set to 0.
3694 * Then the TX thread sets it back to 1.
3695 * The next time the RX thread loops, it sees conn_rx_reset_cpumask
3696 * set to 1 and calls set_cpus_allowed_ptr() again and set it to 0.
3697 */
3698 iscsit_thread_reschedule(conn);
3699
3700 /*
3701 * mode == 1 signals iscsi_target_tx_thread() usage.
3702 * mode == 0 signals iscsi_target_rx_thread() usage.
3703 */
3704 if (mode == 1) {
3705 if (!conn->conn_tx_reset_cpumask)
3706 return;
3707 } else {
3708 if (!conn->conn_rx_reset_cpumask)
3709 return;
3710 }
3711
3712 /*
3713 * Update the CPU mask for this single kthread so that
3714 * both TX and RX kthreads are scheduled to run on the
3715 * same CPU.
3716 */
3717 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3718 if (mode == 1)
3719 conn->conn_tx_reset_cpumask = 0;
3720 else
3721 conn->conn_rx_reset_cpumask = 0;
3722 }
3723 EXPORT_SYMBOL(iscsit_thread_check_cpumask);
3724
3725 int
iscsit_immediate_queue(struct iscsit_conn * conn,struct iscsit_cmd * cmd,int state)3726 iscsit_immediate_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
3727 {
3728 int ret;
3729
3730 switch (state) {
3731 case ISTATE_SEND_R2T:
3732 ret = iscsit_send_r2t(cmd, conn);
3733 if (ret < 0)
3734 goto err;
3735 break;
3736 case ISTATE_REMOVE:
3737 spin_lock_bh(&conn->cmd_lock);
3738 list_del_init(&cmd->i_conn_node);
3739 spin_unlock_bh(&conn->cmd_lock);
3740
3741 iscsit_free_cmd(cmd, false);
3742 break;
3743 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3744 iscsit_mod_nopin_response_timer(conn);
3745 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3746 if (ret < 0)
3747 goto err;
3748 break;
3749 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3750 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3751 if (ret < 0)
3752 goto err;
3753 break;
3754 default:
3755 pr_err("Unknown Opcode: 0x%02x ITT:"
3756 " 0x%08x, i_state: %d on CID: %hu\n",
3757 cmd->iscsi_opcode, cmd->init_task_tag, state,
3758 conn->cid);
3759 goto err;
3760 }
3761
3762 return 0;
3763
3764 err:
3765 return -1;
3766 }
3767 EXPORT_SYMBOL(iscsit_immediate_queue);
3768
3769 static int
iscsit_handle_immediate_queue(struct iscsit_conn * conn)3770 iscsit_handle_immediate_queue(struct iscsit_conn *conn)
3771 {
3772 struct iscsit_transport *t = conn->conn_transport;
3773 struct iscsi_queue_req *qr;
3774 struct iscsit_cmd *cmd;
3775 u8 state;
3776 int ret;
3777
3778 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3779 atomic_set(&conn->check_immediate_queue, 0);
3780 cmd = qr->cmd;
3781 state = qr->state;
3782 kmem_cache_free(lio_qr_cache, qr);
3783
3784 ret = t->iscsit_immediate_queue(conn, cmd, state);
3785 if (ret < 0)
3786 return ret;
3787 }
3788
3789 return 0;
3790 }
3791
3792 int
iscsit_response_queue(struct iscsit_conn * conn,struct iscsit_cmd * cmd,int state)3793 iscsit_response_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
3794 {
3795 int ret;
3796
3797 check_rsp_state:
3798 switch (state) {
3799 case ISTATE_SEND_DATAIN:
3800 ret = iscsit_send_datain(cmd, conn);
3801 if (ret < 0)
3802 goto err;
3803 else if (!ret)
3804 /* more drs */
3805 goto check_rsp_state;
3806 else if (ret == 1) {
3807 /* all done */
3808 spin_lock_bh(&cmd->istate_lock);
3809 cmd->i_state = ISTATE_SENT_STATUS;
3810 spin_unlock_bh(&cmd->istate_lock);
3811
3812 if (atomic_read(&conn->check_immediate_queue))
3813 return 1;
3814
3815 return 0;
3816 } else if (ret == 2) {
3817 /* Still must send status,
3818 SCF_TRANSPORT_TASK_SENSE was set */
3819 spin_lock_bh(&cmd->istate_lock);
3820 cmd->i_state = ISTATE_SEND_STATUS;
3821 spin_unlock_bh(&cmd->istate_lock);
3822 state = ISTATE_SEND_STATUS;
3823 goto check_rsp_state;
3824 }
3825
3826 break;
3827 case ISTATE_SEND_STATUS:
3828 case ISTATE_SEND_STATUS_RECOVERY:
3829 ret = iscsit_send_response(cmd, conn);
3830 break;
3831 case ISTATE_SEND_LOGOUTRSP:
3832 ret = iscsit_send_logout(cmd, conn);
3833 break;
3834 case ISTATE_SEND_ASYNCMSG:
3835 ret = iscsit_send_conn_drop_async_message(
3836 cmd, conn);
3837 break;
3838 case ISTATE_SEND_NOPIN:
3839 ret = iscsit_send_nopin(cmd, conn);
3840 break;
3841 case ISTATE_SEND_REJECT:
3842 ret = iscsit_send_reject(cmd, conn);
3843 break;
3844 case ISTATE_SEND_TASKMGTRSP:
3845 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3846 if (ret != 0)
3847 break;
3848 ret = iscsit_tmr_post_handler(cmd, conn);
3849 if (ret != 0)
3850 iscsit_fall_back_to_erl0(conn->sess);
3851 break;
3852 case ISTATE_SEND_TEXTRSP:
3853 ret = iscsit_send_text_rsp(cmd, conn);
3854 break;
3855 default:
3856 pr_err("Unknown Opcode: 0x%02x ITT:"
3857 " 0x%08x, i_state: %d on CID: %hu\n",
3858 cmd->iscsi_opcode, cmd->init_task_tag,
3859 state, conn->cid);
3860 goto err;
3861 }
3862 if (ret < 0)
3863 goto err;
3864
3865 switch (state) {
3866 case ISTATE_SEND_LOGOUTRSP:
3867 if (!iscsit_logout_post_handler(cmd, conn))
3868 return -ECONNRESET;
3869 fallthrough;
3870 case ISTATE_SEND_STATUS:
3871 case ISTATE_SEND_ASYNCMSG:
3872 case ISTATE_SEND_NOPIN:
3873 case ISTATE_SEND_STATUS_RECOVERY:
3874 case ISTATE_SEND_TEXTRSP:
3875 case ISTATE_SEND_TASKMGTRSP:
3876 case ISTATE_SEND_REJECT:
3877 spin_lock_bh(&cmd->istate_lock);
3878 cmd->i_state = ISTATE_SENT_STATUS;
3879 spin_unlock_bh(&cmd->istate_lock);
3880 break;
3881 default:
3882 pr_err("Unknown Opcode: 0x%02x ITT:"
3883 " 0x%08x, i_state: %d on CID: %hu\n",
3884 cmd->iscsi_opcode, cmd->init_task_tag,
3885 cmd->i_state, conn->cid);
3886 goto err;
3887 }
3888
3889 if (atomic_read(&conn->check_immediate_queue))
3890 return 1;
3891
3892 return 0;
3893
3894 err:
3895 return -1;
3896 }
3897 EXPORT_SYMBOL(iscsit_response_queue);
3898
iscsit_handle_response_queue(struct iscsit_conn * conn)3899 static int iscsit_handle_response_queue(struct iscsit_conn *conn)
3900 {
3901 struct iscsit_transport *t = conn->conn_transport;
3902 struct iscsi_queue_req *qr;
3903 struct iscsit_cmd *cmd;
3904 u8 state;
3905 int ret;
3906
3907 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3908 cmd = qr->cmd;
3909 state = qr->state;
3910 kmem_cache_free(lio_qr_cache, qr);
3911
3912 ret = t->iscsit_response_queue(conn, cmd, state);
3913 if (ret == 1 || ret < 0)
3914 return ret;
3915 }
3916
3917 return 0;
3918 }
3919
iscsi_target_tx_thread(void * arg)3920 int iscsi_target_tx_thread(void *arg)
3921 {
3922 int ret = 0;
3923 struct iscsit_conn *conn = arg;
3924 bool conn_freed = false;
3925
3926 /*
3927 * Allow ourselves to be interrupted by SIGINT so that a
3928 * connection recovery / failure event can be triggered externally.
3929 */
3930 allow_signal(SIGINT);
3931
3932 while (!kthread_should_stop()) {
3933 /*
3934 * Ensure that both TX and RX per connection kthreads
3935 * are scheduled to run on the same CPU.
3936 */
3937 iscsit_thread_check_cpumask(conn, current, 1);
3938
3939 wait_event_interruptible(conn->queues_wq,
3940 !iscsit_conn_all_queues_empty(conn));
3941
3942 if (signal_pending(current))
3943 goto transport_err;
3944
3945 get_immediate:
3946 ret = iscsit_handle_immediate_queue(conn);
3947 if (ret < 0)
3948 goto transport_err;
3949
3950 ret = iscsit_handle_response_queue(conn);
3951 if (ret == 1) {
3952 goto get_immediate;
3953 } else if (ret == -ECONNRESET) {
3954 conn_freed = true;
3955 goto out;
3956 } else if (ret < 0) {
3957 goto transport_err;
3958 }
3959 }
3960
3961 transport_err:
3962 /*
3963 * Avoid the normal connection failure code-path if this connection
3964 * is still within LOGIN mode, and iscsi_np process context is
3965 * responsible for cleaning up the early connection failure.
3966 */
3967 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3968 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3969 out:
3970 if (!conn_freed) {
3971 while (!kthread_should_stop()) {
3972 msleep(100);
3973 }
3974 }
3975 return 0;
3976 }
3977
iscsi_target_rx_opcode(struct iscsit_conn * conn,unsigned char * buf)3978 static int iscsi_target_rx_opcode(struct iscsit_conn *conn, unsigned char *buf)
3979 {
3980 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3981 struct iscsit_cmd *cmd;
3982 int ret = 0;
3983
3984 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3985 case ISCSI_OP_SCSI_CMD:
3986 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3987 if (!cmd)
3988 goto reject;
3989
3990 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3991 break;
3992 case ISCSI_OP_SCSI_DATA_OUT:
3993 ret = iscsit_handle_data_out(conn, buf);
3994 break;
3995 case ISCSI_OP_NOOP_OUT:
3996 cmd = NULL;
3997 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3998 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3999 if (!cmd)
4000 goto reject;
4001 }
4002 ret = iscsit_handle_nop_out(conn, cmd, buf);
4003 break;
4004 case ISCSI_OP_SCSI_TMFUNC:
4005 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4006 if (!cmd)
4007 goto reject;
4008
4009 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4010 break;
4011 case ISCSI_OP_TEXT:
4012 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4013 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4014 if (!cmd)
4015 goto reject;
4016 } else {
4017 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4018 if (!cmd)
4019 goto reject;
4020 }
4021
4022 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4023 break;
4024 case ISCSI_OP_LOGOUT:
4025 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4026 if (!cmd)
4027 goto reject;
4028
4029 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4030 if (ret > 0)
4031 wait_for_completion_timeout(&conn->conn_logout_comp,
4032 SECONDS_FOR_LOGOUT_COMP * HZ);
4033 break;
4034 case ISCSI_OP_SNACK:
4035 ret = iscsit_handle_snack(conn, buf);
4036 break;
4037 default:
4038 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4039 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4040 pr_err("Cannot recover from unknown"
4041 " opcode while ERL=0, closing iSCSI connection.\n");
4042 return -1;
4043 }
4044 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
4045 " closing iSCSI connection.\n");
4046 ret = -1;
4047 break;
4048 }
4049
4050 return ret;
4051 reject:
4052 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4053 }
4054
iscsi_target_check_conn_state(struct iscsit_conn * conn)4055 static bool iscsi_target_check_conn_state(struct iscsit_conn *conn)
4056 {
4057 bool ret;
4058
4059 spin_lock_bh(&conn->state_lock);
4060 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
4061 spin_unlock_bh(&conn->state_lock);
4062
4063 return ret;
4064 }
4065
iscsit_get_rx_pdu(struct iscsit_conn * conn)4066 static void iscsit_get_rx_pdu(struct iscsit_conn *conn)
4067 {
4068 int ret;
4069 u8 *buffer, *tmp_buf, opcode;
4070 u32 checksum = 0, digest = 0;
4071 struct iscsi_hdr *hdr;
4072 struct kvec iov;
4073
4074 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
4075 if (!buffer)
4076 return;
4077
4078 while (!kthread_should_stop()) {
4079 /*
4080 * Ensure that both TX and RX per connection kthreads
4081 * are scheduled to run on the same CPU.
4082 */
4083 iscsit_thread_check_cpumask(conn, current, 0);
4084
4085 memset(&iov, 0, sizeof(struct kvec));
4086
4087 iov.iov_base = buffer;
4088 iov.iov_len = ISCSI_HDR_LEN;
4089
4090 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4091 if (ret != ISCSI_HDR_LEN) {
4092 iscsit_rx_thread_wait_for_tcp(conn);
4093 break;
4094 }
4095
4096 hdr = (struct iscsi_hdr *) buffer;
4097 if (hdr->hlength) {
4098 iov.iov_len = hdr->hlength * 4;
4099 tmp_buf = krealloc(buffer,
4100 ISCSI_HDR_LEN + iov.iov_len,
4101 GFP_KERNEL);
4102 if (!tmp_buf)
4103 break;
4104
4105 buffer = tmp_buf;
4106 iov.iov_base = &buffer[ISCSI_HDR_LEN];
4107
4108 ret = rx_data(conn, &iov, 1, iov.iov_len);
4109 if (ret != iov.iov_len) {
4110 iscsit_rx_thread_wait_for_tcp(conn);
4111 break;
4112 }
4113 }
4114
4115 if (conn->conn_ops->HeaderDigest) {
4116 iov.iov_base = &digest;
4117 iov.iov_len = ISCSI_CRC_LEN;
4118
4119 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4120 if (ret != ISCSI_CRC_LEN) {
4121 iscsit_rx_thread_wait_for_tcp(conn);
4122 break;
4123 }
4124
4125 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
4126 ISCSI_HDR_LEN, 0, NULL,
4127 &checksum);
4128
4129 if (digest != checksum) {
4130 pr_err("HeaderDigest CRC32C failed,"
4131 " received 0x%08x, computed 0x%08x\n",
4132 digest, checksum);
4133 /*
4134 * Set the PDU to 0xff so it will intentionally
4135 * hit default in the switch below.
4136 */
4137 memset(buffer, 0xff, ISCSI_HDR_LEN);
4138 atomic_long_inc(&conn->sess->conn_digest_errors);
4139 } else {
4140 pr_debug("Got HeaderDigest CRC32C"
4141 " 0x%08x\n", checksum);
4142 }
4143 }
4144
4145 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4146 break;
4147
4148 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4149
4150 if (conn->sess->sess_ops->SessionType &&
4151 ((!(opcode & ISCSI_OP_TEXT)) ||
4152 (!(opcode & ISCSI_OP_LOGOUT)))) {
4153 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4154 " while in Discovery Session, rejecting.\n", opcode);
4155 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4156 buffer);
4157 break;
4158 }
4159
4160 ret = iscsi_target_rx_opcode(conn, buffer);
4161 if (ret < 0)
4162 break;
4163 }
4164
4165 kfree(buffer);
4166 }
4167
iscsi_target_rx_thread(void * arg)4168 int iscsi_target_rx_thread(void *arg)
4169 {
4170 int rc;
4171 struct iscsit_conn *conn = arg;
4172 bool conn_freed = false;
4173
4174 /*
4175 * Allow ourselves to be interrupted by SIGINT so that a
4176 * connection recovery / failure event can be triggered externally.
4177 */
4178 allow_signal(SIGINT);
4179 /*
4180 * Wait for iscsi_post_login_handler() to complete before allowing
4181 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4182 */
4183 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4184 if (rc < 0 || iscsi_target_check_conn_state(conn))
4185 goto out;
4186
4187 if (!conn->conn_transport->iscsit_get_rx_pdu)
4188 return 0;
4189
4190 conn->conn_transport->iscsit_get_rx_pdu(conn);
4191
4192 if (!signal_pending(current))
4193 atomic_set(&conn->transport_failed, 1);
4194 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4195
4196 out:
4197 if (!conn_freed) {
4198 while (!kthread_should_stop()) {
4199 msleep(100);
4200 }
4201 }
4202
4203 return 0;
4204 }
4205
iscsit_release_commands_from_conn(struct iscsit_conn * conn)4206 static void iscsit_release_commands_from_conn(struct iscsit_conn *conn)
4207 {
4208 LIST_HEAD(tmp_list);
4209 struct iscsit_cmd *cmd = NULL, *cmd_tmp = NULL;
4210 struct iscsit_session *sess = conn->sess;
4211 /*
4212 * We expect this function to only ever be called from either RX or TX
4213 * thread context via iscsit_close_connection() once the other context
4214 * has been reset -> returned sleeping pre-handler state.
4215 */
4216 spin_lock_bh(&conn->cmd_lock);
4217 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4218
4219 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4220 struct se_cmd *se_cmd = &cmd->se_cmd;
4221
4222 if (!se_cmd->se_tfo)
4223 continue;
4224
4225 spin_lock_irq(&se_cmd->t_state_lock);
4226 if (se_cmd->transport_state & CMD_T_ABORTED) {
4227 if (!(se_cmd->transport_state & CMD_T_TAS))
4228 /*
4229 * LIO's abort path owns the cleanup for this,
4230 * so put it back on the list and let
4231 * aborted_task handle it.
4232 */
4233 list_move_tail(&cmd->i_conn_node,
4234 &conn->conn_cmd_list);
4235 } else {
4236 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4237 }
4238
4239 if (cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
4240 /*
4241 * We never submitted the cmd to LIO core, so we have
4242 * to tell LIO to perform the completion process.
4243 */
4244 spin_unlock_irq(&se_cmd->t_state_lock);
4245 target_complete_cmd(&cmd->se_cmd, SAM_STAT_TASK_ABORTED);
4246 continue;
4247 }
4248 spin_unlock_irq(&se_cmd->t_state_lock);
4249 }
4250 spin_unlock_bh(&conn->cmd_lock);
4251
4252 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4253 list_del_init(&cmd->i_conn_node);
4254
4255 iscsit_increment_maxcmdsn(cmd, sess);
4256 iscsit_free_cmd(cmd, true);
4257
4258 }
4259
4260 /*
4261 * Wait on commands that were cleaned up via the aborted_task path.
4262 * LLDs that implement iscsit_wait_conn will already have waited for
4263 * commands.
4264 */
4265 if (!conn->conn_transport->iscsit_wait_conn) {
4266 target_stop_cmd_counter(conn->cmd_cnt);
4267 target_wait_for_cmds(conn->cmd_cnt);
4268 }
4269 }
4270
iscsit_stop_timers_for_cmds(struct iscsit_conn * conn)4271 static void iscsit_stop_timers_for_cmds(
4272 struct iscsit_conn *conn)
4273 {
4274 struct iscsit_cmd *cmd;
4275
4276 spin_lock_bh(&conn->cmd_lock);
4277 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4278 if (cmd->data_direction == DMA_TO_DEVICE)
4279 iscsit_stop_dataout_timer(cmd);
4280 }
4281 spin_unlock_bh(&conn->cmd_lock);
4282 }
4283
iscsit_close_connection(struct iscsit_conn * conn)4284 int iscsit_close_connection(
4285 struct iscsit_conn *conn)
4286 {
4287 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4288 struct iscsit_session *sess = conn->sess;
4289
4290 pr_debug("Closing iSCSI connection CID %hu on SID:"
4291 " %u\n", conn->cid, sess->sid);
4292 /*
4293 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4294 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4295 * sleeping and the logout response never got sent because the
4296 * connection failed.
4297 *
4298 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4299 * to signal logout response TX interrupt completion. Go ahead and skip
4300 * this for iser since isert_rx_opcode() does not wait on logout failure,
4301 * and to avoid iscsit_conn pointer dereference in iser-target code.
4302 */
4303 if (!conn->conn_transport->rdma_shutdown)
4304 complete(&conn->conn_logout_comp);
4305
4306 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4307 if (conn->tx_thread &&
4308 cmpxchg(&conn->tx_thread_active, true, false)) {
4309 send_sig(SIGINT, conn->tx_thread, 1);
4310 kthread_stop(conn->tx_thread);
4311 }
4312 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4313 if (conn->rx_thread &&
4314 cmpxchg(&conn->rx_thread_active, true, false)) {
4315 send_sig(SIGINT, conn->rx_thread, 1);
4316 kthread_stop(conn->rx_thread);
4317 }
4318 }
4319
4320 spin_lock(&iscsit_global->ts_bitmap_lock);
4321 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4322 get_order(1));
4323 spin_unlock(&iscsit_global->ts_bitmap_lock);
4324
4325 iscsit_stop_timers_for_cmds(conn);
4326 iscsit_stop_nopin_response_timer(conn);
4327 iscsit_stop_nopin_timer(conn);
4328
4329 if (conn->conn_transport->iscsit_wait_conn)
4330 conn->conn_transport->iscsit_wait_conn(conn);
4331
4332 /*
4333 * During Connection recovery drop unacknowledged out of order
4334 * commands for this connection, and prepare the other commands
4335 * for reallegiance.
4336 *
4337 * During normal operation clear the out of order commands (but
4338 * do not free the struct iscsi_ooo_cmdsn's) and release all
4339 * struct iscsit_cmds.
4340 */
4341 if (atomic_read(&conn->connection_recovery)) {
4342 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4343 iscsit_prepare_cmds_for_reallegiance(conn);
4344 } else {
4345 iscsit_clear_ooo_cmdsns_for_conn(conn);
4346 iscsit_release_commands_from_conn(conn);
4347 }
4348 iscsit_free_queue_reqs_for_conn(conn);
4349
4350 /*
4351 * Handle decrementing session or connection usage count if
4352 * a logout response was not able to be sent because the
4353 * connection failed. Fall back to Session Recovery here.
4354 */
4355 if (atomic_read(&conn->conn_logout_remove)) {
4356 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4357 iscsit_dec_conn_usage_count(conn);
4358 iscsit_dec_session_usage_count(sess);
4359 }
4360 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4361 iscsit_dec_conn_usage_count(conn);
4362
4363 atomic_set(&conn->conn_logout_remove, 0);
4364 atomic_set(&sess->session_reinstatement, 0);
4365 atomic_set(&sess->session_fall_back_to_erl0, 1);
4366 }
4367
4368 spin_lock_bh(&sess->conn_lock);
4369 list_del(&conn->conn_list);
4370
4371 /*
4372 * Attempt to let the Initiator know this connection failed by
4373 * sending an Connection Dropped Async Message on another
4374 * active connection.
4375 */
4376 if (atomic_read(&conn->connection_recovery))
4377 iscsit_build_conn_drop_async_message(conn);
4378
4379 spin_unlock_bh(&sess->conn_lock);
4380
4381 /*
4382 * If connection reinstatement is being performed on this connection,
4383 * up the connection reinstatement semaphore that is being blocked on
4384 * in iscsit_cause_connection_reinstatement().
4385 */
4386 spin_lock_bh(&conn->state_lock);
4387 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4388 spin_unlock_bh(&conn->state_lock);
4389 complete(&conn->conn_wait_comp);
4390 wait_for_completion(&conn->conn_post_wait_comp);
4391 spin_lock_bh(&conn->state_lock);
4392 }
4393
4394 /*
4395 * If connection reinstatement is being performed on this connection
4396 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4397 * connection wait rcfr semaphore that is being blocked on
4398 * an iscsit_connection_reinstatement_rcfr().
4399 */
4400 if (atomic_read(&conn->connection_wait_rcfr)) {
4401 spin_unlock_bh(&conn->state_lock);
4402 complete(&conn->conn_wait_rcfr_comp);
4403 wait_for_completion(&conn->conn_post_wait_comp);
4404 spin_lock_bh(&conn->state_lock);
4405 }
4406 atomic_set(&conn->connection_reinstatement, 1);
4407 spin_unlock_bh(&conn->state_lock);
4408
4409 /*
4410 * If any other processes are accessing this connection pointer we
4411 * must wait until they have completed.
4412 */
4413 iscsit_check_conn_usage_count(conn);
4414
4415 ahash_request_free(conn->conn_tx_hash);
4416 if (conn->conn_rx_hash) {
4417 struct crypto_ahash *tfm;
4418
4419 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4420 ahash_request_free(conn->conn_rx_hash);
4421 crypto_free_ahash(tfm);
4422 }
4423
4424 if (conn->sock)
4425 sock_release(conn->sock);
4426
4427 if (conn->conn_transport->iscsit_free_conn)
4428 conn->conn_transport->iscsit_free_conn(conn);
4429
4430 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4431 conn->conn_state = TARG_CONN_STATE_FREE;
4432 iscsit_free_conn(conn);
4433
4434 spin_lock_bh(&sess->conn_lock);
4435 atomic_dec(&sess->nconn);
4436 pr_debug("Decremented iSCSI connection count to %d from node:"
4437 " %s\n", atomic_read(&sess->nconn),
4438 sess->sess_ops->InitiatorName);
4439 /*
4440 * Make sure that if one connection fails in an non ERL=2 iSCSI
4441 * Session that they all fail.
4442 */
4443 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4444 !atomic_read(&sess->session_logout))
4445 atomic_set(&sess->session_fall_back_to_erl0, 1);
4446
4447 /*
4448 * If this was not the last connection in the session, and we are
4449 * performing session reinstatement or falling back to ERL=0, call
4450 * iscsit_stop_session() without sleeping to shutdown the other
4451 * active connections.
4452 */
4453 if (atomic_read(&sess->nconn)) {
4454 if (!atomic_read(&sess->session_reinstatement) &&
4455 !atomic_read(&sess->session_fall_back_to_erl0)) {
4456 spin_unlock_bh(&sess->conn_lock);
4457 return 0;
4458 }
4459 if (!atomic_read(&sess->session_stop_active)) {
4460 atomic_set(&sess->session_stop_active, 1);
4461 spin_unlock_bh(&sess->conn_lock);
4462 iscsit_stop_session(sess, 0, 0);
4463 return 0;
4464 }
4465 spin_unlock_bh(&sess->conn_lock);
4466 return 0;
4467 }
4468
4469 /*
4470 * If this was the last connection in the session and one of the
4471 * following is occurring:
4472 *
4473 * Session Reinstatement is not being performed, and are falling back
4474 * to ERL=0 call iscsit_close_session().
4475 *
4476 * Session Logout was requested. iscsit_close_session() will be called
4477 * elsewhere.
4478 *
4479 * Session Continuation is not being performed, start the Time2Retain
4480 * handler and check if sleep_on_sess_wait_sem is active.
4481 */
4482 if (!atomic_read(&sess->session_reinstatement) &&
4483 atomic_read(&sess->session_fall_back_to_erl0)) {
4484 spin_unlock_bh(&sess->conn_lock);
4485 complete_all(&sess->session_wait_comp);
4486 iscsit_close_session(sess, true);
4487
4488 return 0;
4489 } else if (atomic_read(&sess->session_logout)) {
4490 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4491 sess->session_state = TARG_SESS_STATE_FREE;
4492
4493 if (atomic_read(&sess->session_close)) {
4494 spin_unlock_bh(&sess->conn_lock);
4495 complete_all(&sess->session_wait_comp);
4496 iscsit_close_session(sess, true);
4497 } else {
4498 spin_unlock_bh(&sess->conn_lock);
4499 }
4500
4501 return 0;
4502 } else {
4503 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4504 sess->session_state = TARG_SESS_STATE_FAILED;
4505
4506 if (!atomic_read(&sess->session_continuation))
4507 iscsit_start_time2retain_handler(sess);
4508
4509 if (atomic_read(&sess->session_close)) {
4510 spin_unlock_bh(&sess->conn_lock);
4511 complete_all(&sess->session_wait_comp);
4512 iscsit_close_session(sess, true);
4513 } else {
4514 spin_unlock_bh(&sess->conn_lock);
4515 }
4516
4517 return 0;
4518 }
4519 }
4520
4521 /*
4522 * If the iSCSI Session for the iSCSI Initiator Node exists,
4523 * forcefully shutdown the iSCSI NEXUS.
4524 */
iscsit_close_session(struct iscsit_session * sess,bool can_sleep)4525 int iscsit_close_session(struct iscsit_session *sess, bool can_sleep)
4526 {
4527 struct iscsi_portal_group *tpg = sess->tpg;
4528 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4529
4530 if (atomic_read(&sess->nconn)) {
4531 pr_err("%d connection(s) still exist for iSCSI session"
4532 " to %s\n", atomic_read(&sess->nconn),
4533 sess->sess_ops->InitiatorName);
4534 BUG();
4535 }
4536
4537 spin_lock_bh(&se_tpg->session_lock);
4538 atomic_set(&sess->session_logout, 1);
4539 atomic_set(&sess->session_reinstatement, 1);
4540 iscsit_stop_time2retain_timer(sess);
4541 spin_unlock_bh(&se_tpg->session_lock);
4542
4543 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4544 iscsit_free_connection_recovery_entries(sess);
4545
4546 /*
4547 * transport_deregister_session_configfs() will clear the
4548 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4549 * can be setting it again with __transport_register_session() in
4550 * iscsi_post_login_handler() again after the iscsit_stop_session()
4551 * completes in iscsi_np context.
4552 */
4553 transport_deregister_session_configfs(sess->se_sess);
4554
4555 /*
4556 * If any other processes are accessing this session pointer we must
4557 * wait until they have completed. If we are in an interrupt (the
4558 * time2retain handler) and contain and active session usage count we
4559 * restart the timer and exit.
4560 */
4561 if (iscsit_check_session_usage_count(sess, can_sleep)) {
4562 atomic_set(&sess->session_logout, 0);
4563 iscsit_start_time2retain_handler(sess);
4564 return 0;
4565 }
4566
4567 transport_deregister_session(sess->se_sess);
4568
4569 iscsit_free_all_ooo_cmdsns(sess);
4570
4571 spin_lock_bh(&se_tpg->session_lock);
4572 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4573 sess->session_state = TARG_SESS_STATE_FREE;
4574 pr_debug("Released iSCSI session from node: %s\n",
4575 sess->sess_ops->InitiatorName);
4576 tpg->nsessions--;
4577 if (tpg->tpg_tiqn)
4578 tpg->tpg_tiqn->tiqn_nsessions--;
4579
4580 pr_debug("Decremented number of active iSCSI Sessions on"
4581 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4582
4583 ida_free(&sess_ida, sess->session_index);
4584 kfree(sess->sess_ops);
4585 sess->sess_ops = NULL;
4586 spin_unlock_bh(&se_tpg->session_lock);
4587
4588 kfree(sess);
4589 return 0;
4590 }
4591
iscsit_logout_post_handler_closesession(struct iscsit_conn * conn)4592 static void iscsit_logout_post_handler_closesession(
4593 struct iscsit_conn *conn)
4594 {
4595 struct iscsit_session *sess = conn->sess;
4596 int sleep = 1;
4597 /*
4598 * Traditional iscsi/tcp will invoke this logic from TX thread
4599 * context during session logout, so clear tx_thread_active and
4600 * sleep if iscsit_close_connection() has not already occured.
4601 *
4602 * Since iser-target invokes this logic from it's own workqueue,
4603 * always sleep waiting for RX/TX thread shutdown to complete
4604 * within iscsit_close_connection().
4605 */
4606 if (!conn->conn_transport->rdma_shutdown) {
4607 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4608 if (!sleep)
4609 return;
4610 }
4611
4612 atomic_set(&conn->conn_logout_remove, 0);
4613 complete(&conn->conn_logout_comp);
4614
4615 iscsit_dec_conn_usage_count(conn);
4616 atomic_set(&sess->session_close, 1);
4617 iscsit_stop_session(sess, sleep, sleep);
4618 iscsit_dec_session_usage_count(sess);
4619 }
4620
iscsit_logout_post_handler_samecid(struct iscsit_conn * conn)4621 static void iscsit_logout_post_handler_samecid(
4622 struct iscsit_conn *conn)
4623 {
4624 int sleep = 1;
4625
4626 if (!conn->conn_transport->rdma_shutdown) {
4627 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4628 if (!sleep)
4629 return;
4630 }
4631
4632 atomic_set(&conn->conn_logout_remove, 0);
4633 complete(&conn->conn_logout_comp);
4634
4635 iscsit_cause_connection_reinstatement(conn, sleep);
4636 iscsit_dec_conn_usage_count(conn);
4637 }
4638
iscsit_logout_post_handler_diffcid(struct iscsit_conn * conn,u16 cid)4639 static void iscsit_logout_post_handler_diffcid(
4640 struct iscsit_conn *conn,
4641 u16 cid)
4642 {
4643 struct iscsit_conn *l_conn;
4644 struct iscsit_session *sess = conn->sess;
4645 bool conn_found = false;
4646
4647 if (!sess)
4648 return;
4649
4650 spin_lock_bh(&sess->conn_lock);
4651 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4652 if (l_conn->cid == cid) {
4653 iscsit_inc_conn_usage_count(l_conn);
4654 conn_found = true;
4655 break;
4656 }
4657 }
4658 spin_unlock_bh(&sess->conn_lock);
4659
4660 if (!conn_found)
4661 return;
4662
4663 if (l_conn->sock)
4664 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4665
4666 spin_lock_bh(&l_conn->state_lock);
4667 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4668 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4669 spin_unlock_bh(&l_conn->state_lock);
4670
4671 iscsit_cause_connection_reinstatement(l_conn, 1);
4672 iscsit_dec_conn_usage_count(l_conn);
4673 }
4674
4675 /*
4676 * Return of 0 causes the TX thread to restart.
4677 */
iscsit_logout_post_handler(struct iscsit_cmd * cmd,struct iscsit_conn * conn)4678 int iscsit_logout_post_handler(
4679 struct iscsit_cmd *cmd,
4680 struct iscsit_conn *conn)
4681 {
4682 int ret = 0;
4683
4684 switch (cmd->logout_reason) {
4685 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4686 switch (cmd->logout_response) {
4687 case ISCSI_LOGOUT_SUCCESS:
4688 case ISCSI_LOGOUT_CLEANUP_FAILED:
4689 default:
4690 iscsit_logout_post_handler_closesession(conn);
4691 break;
4692 }
4693 break;
4694 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4695 if (conn->cid == cmd->logout_cid) {
4696 switch (cmd->logout_response) {
4697 case ISCSI_LOGOUT_SUCCESS:
4698 case ISCSI_LOGOUT_CLEANUP_FAILED:
4699 default:
4700 iscsit_logout_post_handler_samecid(conn);
4701 break;
4702 }
4703 } else {
4704 switch (cmd->logout_response) {
4705 case ISCSI_LOGOUT_SUCCESS:
4706 iscsit_logout_post_handler_diffcid(conn,
4707 cmd->logout_cid);
4708 break;
4709 case ISCSI_LOGOUT_CID_NOT_FOUND:
4710 case ISCSI_LOGOUT_CLEANUP_FAILED:
4711 default:
4712 break;
4713 }
4714 ret = 1;
4715 }
4716 break;
4717 case ISCSI_LOGOUT_REASON_RECOVERY:
4718 switch (cmd->logout_response) {
4719 case ISCSI_LOGOUT_SUCCESS:
4720 case ISCSI_LOGOUT_CID_NOT_FOUND:
4721 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4722 case ISCSI_LOGOUT_CLEANUP_FAILED:
4723 default:
4724 break;
4725 }
4726 ret = 1;
4727 break;
4728 default:
4729 break;
4730
4731 }
4732 return ret;
4733 }
4734 EXPORT_SYMBOL(iscsit_logout_post_handler);
4735
iscsit_fail_session(struct iscsit_session * sess)4736 void iscsit_fail_session(struct iscsit_session *sess)
4737 {
4738 struct iscsit_conn *conn;
4739
4740 spin_lock_bh(&sess->conn_lock);
4741 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4742 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4743 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4744 }
4745 spin_unlock_bh(&sess->conn_lock);
4746
4747 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4748 sess->session_state = TARG_SESS_STATE_FAILED;
4749 }
4750
iscsit_stop_session(struct iscsit_session * sess,int session_sleep,int connection_sleep)4751 void iscsit_stop_session(
4752 struct iscsit_session *sess,
4753 int session_sleep,
4754 int connection_sleep)
4755 {
4756 u16 conn_count = atomic_read(&sess->nconn);
4757 struct iscsit_conn *conn, *conn_tmp = NULL;
4758 int is_last;
4759
4760 spin_lock_bh(&sess->conn_lock);
4761
4762 if (connection_sleep) {
4763 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4764 conn_list) {
4765 if (conn_count == 0)
4766 break;
4767
4768 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4769 is_last = 1;
4770 } else {
4771 iscsit_inc_conn_usage_count(conn_tmp);
4772 is_last = 0;
4773 }
4774 iscsit_inc_conn_usage_count(conn);
4775
4776 spin_unlock_bh(&sess->conn_lock);
4777 iscsit_cause_connection_reinstatement(conn, 1);
4778 spin_lock_bh(&sess->conn_lock);
4779
4780 iscsit_dec_conn_usage_count(conn);
4781 if (is_last == 0)
4782 iscsit_dec_conn_usage_count(conn_tmp);
4783 conn_count--;
4784 }
4785 } else {
4786 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4787 iscsit_cause_connection_reinstatement(conn, 0);
4788 }
4789
4790 if (session_sleep && atomic_read(&sess->nconn)) {
4791 spin_unlock_bh(&sess->conn_lock);
4792 wait_for_completion(&sess->session_wait_comp);
4793 } else
4794 spin_unlock_bh(&sess->conn_lock);
4795 }
4796
iscsit_release_sessions_for_tpg(struct iscsi_portal_group * tpg,int force)4797 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4798 {
4799 struct iscsit_session *sess;
4800 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4801 struct se_session *se_sess, *se_sess_tmp;
4802 LIST_HEAD(free_list);
4803 int session_count = 0;
4804
4805 spin_lock_bh(&se_tpg->session_lock);
4806 if (tpg->nsessions && !force) {
4807 spin_unlock_bh(&se_tpg->session_lock);
4808 return -1;
4809 }
4810
4811 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4812 sess_list) {
4813 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr;
4814
4815 spin_lock(&sess->conn_lock);
4816 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4817 atomic_read(&sess->session_logout) ||
4818 atomic_read(&sess->session_close) ||
4819 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4820 spin_unlock(&sess->conn_lock);
4821 continue;
4822 }
4823 iscsit_inc_session_usage_count(sess);
4824 atomic_set(&sess->session_reinstatement, 1);
4825 atomic_set(&sess->session_fall_back_to_erl0, 1);
4826 atomic_set(&sess->session_close, 1);
4827 spin_unlock(&sess->conn_lock);
4828
4829 list_move_tail(&se_sess->sess_list, &free_list);
4830 }
4831 spin_unlock_bh(&se_tpg->session_lock);
4832
4833 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4834 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr;
4835
4836 list_del_init(&se_sess->sess_list);
4837 iscsit_stop_session(sess, 1, 1);
4838 iscsit_dec_session_usage_count(sess);
4839 session_count++;
4840 }
4841
4842 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4843 " Group: %hu\n", session_count, tpg->tpgt);
4844 return 0;
4845 }
4846
4847 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4848 MODULE_VERSION("4.1.x");
4849 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4850 MODULE_LICENSE("GPL");
4851
4852 module_init(iscsi_target_init_module);
4853 module_exit(iscsi_target_cleanup_module);
4854