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 return 0;
1238 }
1239 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1240
iscsit_set_unsolicited_dataout(struct iscsit_cmd * cmd)1241 void iscsit_set_unsolicited_dataout(struct iscsit_cmd *cmd)
1242 {
1243 iscsit_set_dataout_sequence_values(cmd);
1244
1245 spin_lock_bh(&cmd->dataout_timeout_lock);
1246 iscsit_start_dataout_timer(cmd, cmd->conn);
1247 spin_unlock_bh(&cmd->dataout_timeout_lock);
1248 }
1249 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout);
1250
iscsit_process_scsi_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_scsi_req * hdr)1251 int iscsit_process_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1252 struct iscsi_scsi_req *hdr)
1253 {
1254 int cmdsn_ret = 0;
1255 /*
1256 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1257 * the Immediate Bit is not set, and no Immediate
1258 * Data is attached.
1259 *
1260 * A PDU/CmdSN carrying Immediate Data can only
1261 * be processed after the DataCRC has passed.
1262 * If the DataCRC fails, the CmdSN MUST NOT
1263 * be acknowledged. (See below)
1264 */
1265 if (!cmd->immediate_data) {
1266 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1267 (unsigned char *)hdr, hdr->cmdsn);
1268 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1269 return -1;
1270 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1271 target_put_sess_cmd(&cmd->se_cmd);
1272 return 0;
1273 }
1274 }
1275
1276 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1277
1278 /*
1279 * If no Immediate Data is attached, it's OK to return now.
1280 */
1281 if (!cmd->immediate_data) {
1282 if (!cmd->sense_reason && cmd->unsolicited_data)
1283 iscsit_set_unsolicited_dataout(cmd);
1284 if (!cmd->sense_reason)
1285 return 0;
1286
1287 target_put_sess_cmd(&cmd->se_cmd);
1288 return 0;
1289 }
1290
1291 /*
1292 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1293 * execution. These exceptions are processed in CmdSN order using
1294 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1295 */
1296 if (cmd->sense_reason)
1297 return 1;
1298 /*
1299 * Call directly into transport_generic_new_cmd() to perform
1300 * the backend memory allocation.
1301 */
1302 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1303 if (cmd->sense_reason)
1304 return 1;
1305
1306 return 0;
1307 }
1308 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1309
1310 static int
iscsit_get_immediate_data(struct iscsit_cmd * cmd,struct iscsi_scsi_req * hdr,bool dump_payload)1311 iscsit_get_immediate_data(struct iscsit_cmd *cmd, struct iscsi_scsi_req *hdr,
1312 bool dump_payload)
1313 {
1314 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1315 int rc;
1316
1317 /*
1318 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1319 */
1320 if (dump_payload) {
1321 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done,
1322 cmd->first_burst_len);
1323
1324 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n",
1325 cmd->se_cmd.data_length, cmd->write_data_done,
1326 cmd->first_burst_len, length);
1327 rc = iscsit_dump_data_payload(cmd->conn, length, 1);
1328 pr_debug("Finished dumping immediate data\n");
1329 if (rc < 0)
1330 immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER;
1331 } else {
1332 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1333 cmd->first_burst_len);
1334 }
1335
1336 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1337 /*
1338 * A PDU/CmdSN carrying Immediate Data passed
1339 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1340 * Immediate Bit is not set.
1341 */
1342 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1343 (unsigned char *)hdr, hdr->cmdsn);
1344 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1345 return -1;
1346
1347 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1348 target_put_sess_cmd(&cmd->se_cmd);
1349
1350 return 0;
1351 } else if (cmd->unsolicited_data)
1352 iscsit_set_unsolicited_dataout(cmd);
1353
1354 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1355 /*
1356 * Immediate Data failed DataCRC and ERL>=1,
1357 * silently drop this PDU and let the initiator
1358 * plug the CmdSN gap.
1359 *
1360 * FIXME: Send Unsolicited NOPIN with reserved
1361 * TTT here to help the initiator figure out
1362 * the missing CmdSN, although they should be
1363 * intelligent enough to determine the missing
1364 * CmdSN and issue a retry to plug the sequence.
1365 */
1366 cmd->i_state = ISTATE_REMOVE;
1367 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1368 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1369 return -1;
1370
1371 return 0;
1372 }
1373
1374 static int
iscsit_handle_scsi_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)1375 iscsit_handle_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1376 unsigned char *buf)
1377 {
1378 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1379 int rc, immed_data;
1380 bool dump_payload = false;
1381
1382 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1383 if (rc < 0)
1384 return 0;
1385 /*
1386 * Allocation iovecs needed for struct socket operations for
1387 * traditional iSCSI block I/O.
1388 */
1389 if (iscsit_allocate_iovecs(cmd) < 0) {
1390 return iscsit_reject_cmd(cmd,
1391 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1392 }
1393 immed_data = cmd->immediate_data;
1394
1395 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1396 if (rc < 0)
1397 return rc;
1398 else if (rc > 0)
1399 dump_payload = true;
1400
1401 if (!immed_data)
1402 return 0;
1403
1404 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1405 }
1406
iscsit_do_crypto_hash_sg(struct ahash_request * hash,struct iscsit_cmd * cmd,u32 data_offset,u32 data_length,u32 padding,u8 * pad_bytes)1407 static u32 iscsit_do_crypto_hash_sg(
1408 struct ahash_request *hash,
1409 struct iscsit_cmd *cmd,
1410 u32 data_offset,
1411 u32 data_length,
1412 u32 padding,
1413 u8 *pad_bytes)
1414 {
1415 u32 data_crc;
1416 struct scatterlist *sg;
1417 unsigned int page_off;
1418
1419 crypto_ahash_init(hash);
1420
1421 sg = cmd->first_data_sg;
1422 page_off = cmd->first_data_sg_off;
1423
1424 if (data_length && page_off) {
1425 struct scatterlist first_sg;
1426 u32 len = min_t(u32, data_length, sg->length - page_off);
1427
1428 sg_init_table(&first_sg, 1);
1429 sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off);
1430
1431 ahash_request_set_crypt(hash, &first_sg, NULL, len);
1432 crypto_ahash_update(hash);
1433
1434 data_length -= len;
1435 sg = sg_next(sg);
1436 }
1437
1438 while (data_length) {
1439 u32 cur_len = min_t(u32, data_length, sg->length);
1440
1441 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1442 crypto_ahash_update(hash);
1443
1444 data_length -= cur_len;
1445 /* iscsit_map_iovec has already checked for invalid sg pointers */
1446 sg = sg_next(sg);
1447 }
1448
1449 if (padding) {
1450 struct scatterlist pad_sg;
1451
1452 sg_init_one(&pad_sg, pad_bytes, padding);
1453 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1454 padding);
1455 crypto_ahash_finup(hash);
1456 } else {
1457 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1458 crypto_ahash_final(hash);
1459 }
1460
1461 return data_crc;
1462 }
1463
iscsit_do_crypto_hash_buf(struct ahash_request * hash,const void * buf,u32 payload_length,u32 padding,const void * pad_bytes,void * data_crc)1464 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1465 const void *buf, u32 payload_length, u32 padding,
1466 const void *pad_bytes, void *data_crc)
1467 {
1468 struct scatterlist sg[2];
1469
1470 sg_init_table(sg, ARRAY_SIZE(sg));
1471 sg_set_buf(sg, buf, payload_length);
1472 if (padding)
1473 sg_set_buf(sg + 1, pad_bytes, padding);
1474
1475 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1476
1477 crypto_ahash_digest(hash);
1478 }
1479
1480 int
__iscsit_check_dataout_hdr(struct iscsit_conn * conn,void * buf,struct iscsit_cmd * cmd,u32 payload_length,bool * success)1481 __iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf,
1482 struct iscsit_cmd *cmd, u32 payload_length,
1483 bool *success)
1484 {
1485 struct iscsi_data *hdr = buf;
1486 struct se_cmd *se_cmd;
1487 int rc;
1488
1489 /* iSCSI write */
1490 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1491
1492 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1493 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1494 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1495 payload_length, conn->cid);
1496
1497 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1498 pr_err("Command ITT: 0x%08x received DataOUT after"
1499 " last DataOUT received, dumping payload\n",
1500 cmd->init_task_tag);
1501 return iscsit_dump_data_payload(conn, payload_length, 1);
1502 }
1503
1504 if (cmd->data_direction != DMA_TO_DEVICE) {
1505 pr_err("Command ITT: 0x%08x received DataOUT for a"
1506 " NON-WRITE command.\n", cmd->init_task_tag);
1507 return iscsit_dump_data_payload(conn, payload_length, 1);
1508 }
1509 se_cmd = &cmd->se_cmd;
1510 iscsit_mod_dataout_timer(cmd);
1511
1512 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1513 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1514 be32_to_cpu(hdr->offset), payload_length,
1515 cmd->se_cmd.data_length);
1516 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1517 }
1518
1519 if (cmd->unsolicited_data) {
1520 int dump_unsolicited_data = 0;
1521
1522 if (conn->sess->sess_ops->InitialR2T) {
1523 pr_err("Received unexpected unsolicited data"
1524 " while InitialR2T=Yes, protocol error.\n");
1525 transport_send_check_condition_and_sense(&cmd->se_cmd,
1526 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1527 return -1;
1528 }
1529 /*
1530 * Special case for dealing with Unsolicited DataOUT
1531 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1532 * failures;
1533 */
1534
1535 /* Something's amiss if we're not in WRITE_PENDING state... */
1536 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1537 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1538 dump_unsolicited_data = 1;
1539
1540 if (dump_unsolicited_data) {
1541 /*
1542 * Check if a delayed TASK_ABORTED status needs to
1543 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1544 * received with the unsolicited data out.
1545 */
1546 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1547 iscsit_stop_dataout_timer(cmd);
1548
1549 return iscsit_dump_data_payload(conn, payload_length, 1);
1550 }
1551 } else {
1552 /*
1553 * For the normal solicited data path:
1554 *
1555 * Check for a delayed TASK_ABORTED status and dump any
1556 * incoming data out payload if one exists. Also, when the
1557 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1558 * data out sequence, we decrement outstanding_r2ts. Once
1559 * outstanding_r2ts reaches zero, go ahead and send the delayed
1560 * TASK_ABORTED status.
1561 */
1562 if (se_cmd->transport_state & CMD_T_ABORTED) {
1563 if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1564 --cmd->outstanding_r2ts < 1)
1565 iscsit_stop_dataout_timer(cmd);
1566
1567 return iscsit_dump_data_payload(conn, payload_length, 1);
1568 }
1569 }
1570 /*
1571 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1572 * within-command recovery checks before receiving the payload.
1573 */
1574 rc = iscsit_check_pre_dataout(cmd, buf);
1575 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1576 return 0;
1577 else if (rc == DATAOUT_CANNOT_RECOVER)
1578 return -1;
1579 *success = true;
1580 return 0;
1581 }
1582 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1583
1584 int
iscsit_check_dataout_hdr(struct iscsit_conn * conn,void * buf,struct iscsit_cmd ** out_cmd)1585 iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf,
1586 struct iscsit_cmd **out_cmd)
1587 {
1588 struct iscsi_data *hdr = buf;
1589 struct iscsit_cmd *cmd;
1590 u32 payload_length = ntoh24(hdr->dlength);
1591 int rc;
1592 bool success = false;
1593
1594 if (!payload_length) {
1595 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1596 return 0;
1597 }
1598
1599 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1600 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1601 " MaxXmitDataSegmentLength: %u\n", payload_length,
1602 conn->conn_ops->MaxXmitDataSegmentLength);
1603 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1604 }
1605
1606 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1607 if (!cmd)
1608 return 0;
1609
1610 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1611
1612 if (success)
1613 *out_cmd = cmd;
1614
1615 return rc;
1616 }
1617 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1618
1619 static int
iscsit_get_dataout(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_data * hdr)1620 iscsit_get_dataout(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1621 struct iscsi_data *hdr)
1622 {
1623 struct kvec *iov;
1624 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1625 u32 payload_length;
1626 int iov_ret, data_crc_failed = 0;
1627
1628 payload_length = min_t(u32, cmd->se_cmd.data_length,
1629 ntoh24(hdr->dlength));
1630 rx_size += payload_length;
1631 iov = &cmd->iov_data[0];
1632
1633 iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2,
1634 be32_to_cpu(hdr->offset), payload_length);
1635 if (iov_ret < 0)
1636 return -1;
1637
1638 iov_count += iov_ret;
1639
1640 padding = ((-payload_length) & 3);
1641 if (padding != 0) {
1642 iov[iov_count].iov_base = cmd->pad_bytes;
1643 iov[iov_count++].iov_len = padding;
1644 rx_size += padding;
1645 pr_debug("Receiving %u padding bytes.\n", padding);
1646 }
1647
1648 if (conn->conn_ops->DataDigest) {
1649 iov[iov_count].iov_base = &checksum;
1650 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1651 rx_size += ISCSI_CRC_LEN;
1652 }
1653
1654 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
1655 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1656
1657 iscsit_unmap_iovec(cmd);
1658
1659 if (rx_got != rx_size)
1660 return -1;
1661
1662 if (conn->conn_ops->DataDigest) {
1663 u32 data_crc;
1664
1665 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1666 be32_to_cpu(hdr->offset),
1667 payload_length, padding,
1668 cmd->pad_bytes);
1669
1670 if (checksum != data_crc) {
1671 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1672 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1673 " does not match computed 0x%08x\n",
1674 hdr->itt, hdr->offset, payload_length,
1675 hdr->datasn, checksum, data_crc);
1676 data_crc_failed = 1;
1677 } else {
1678 pr_debug("Got CRC32C DataDigest 0x%08x for"
1679 " %u bytes of Data Out\n", checksum,
1680 payload_length);
1681 }
1682 }
1683
1684 return data_crc_failed;
1685 }
1686
1687 int
iscsit_check_dataout_payload(struct iscsit_cmd * cmd,struct iscsi_data * hdr,bool data_crc_failed)1688 iscsit_check_dataout_payload(struct iscsit_cmd *cmd, struct iscsi_data *hdr,
1689 bool data_crc_failed)
1690 {
1691 struct iscsit_conn *conn = cmd->conn;
1692 int rc, ooo_cmdsn;
1693 /*
1694 * Increment post receive data and CRC values or perform
1695 * within-command recovery.
1696 */
1697 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1698 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1699 return 0;
1700 else if (rc == DATAOUT_SEND_R2T) {
1701 iscsit_set_dataout_sequence_values(cmd);
1702 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1703 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1704 /*
1705 * Handle extra special case for out of order
1706 * Unsolicited Data Out.
1707 */
1708 spin_lock_bh(&cmd->istate_lock);
1709 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1710 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1711 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1712 spin_unlock_bh(&cmd->istate_lock);
1713
1714 iscsit_stop_dataout_timer(cmd);
1715 if (ooo_cmdsn)
1716 return 0;
1717 target_execute_cmd(&cmd->se_cmd);
1718 return 0;
1719 } else /* DATAOUT_CANNOT_RECOVER */
1720 return -1;
1721
1722 return 0;
1723 }
1724 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1725
iscsit_handle_data_out(struct iscsit_conn * conn,unsigned char * buf)1726 static int iscsit_handle_data_out(struct iscsit_conn *conn, unsigned char *buf)
1727 {
1728 struct iscsit_cmd *cmd = NULL;
1729 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1730 int rc;
1731 bool data_crc_failed = false;
1732
1733 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1734 if (rc < 0)
1735 return 0;
1736 else if (!cmd)
1737 return 0;
1738
1739 rc = iscsit_get_dataout(conn, cmd, hdr);
1740 if (rc < 0)
1741 return rc;
1742 else if (rc > 0)
1743 data_crc_failed = true;
1744
1745 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1746 }
1747
iscsit_setup_nop_out(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_nopout * hdr)1748 int iscsit_setup_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1749 struct iscsi_nopout *hdr)
1750 {
1751 u32 payload_length = ntoh24(hdr->dlength);
1752
1753 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1754 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1755 if (!cmd)
1756 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1757 (unsigned char *)hdr);
1758
1759 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1760 (unsigned char *)hdr);
1761 }
1762
1763 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1764 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1765 " not set, protocol error.\n");
1766 if (!cmd)
1767 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1768 (unsigned char *)hdr);
1769
1770 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1771 (unsigned char *)hdr);
1772 }
1773
1774 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1775 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1776 " greater than MaxXmitDataSegmentLength: %u, protocol"
1777 " error.\n", payload_length,
1778 conn->conn_ops->MaxXmitDataSegmentLength);
1779 if (!cmd)
1780 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1781 (unsigned char *)hdr);
1782
1783 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1784 (unsigned char *)hdr);
1785 }
1786
1787 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1788 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1789 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1790 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1791 payload_length);
1792 /*
1793 * This is not a response to a Unsolicited NopIN, which means
1794 * it can either be a NOPOUT ping request (with a valid ITT),
1795 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1796 * Either way, make sure we allocate an struct iscsit_cmd, as both
1797 * can contain ping data.
1798 */
1799 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1800 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1801 cmd->i_state = ISTATE_SEND_NOPIN;
1802 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1803 1 : 0);
1804 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1805 cmd->targ_xfer_tag = 0xFFFFFFFF;
1806 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1807 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1808 cmd->data_direction = DMA_NONE;
1809 }
1810
1811 return 0;
1812 }
1813 EXPORT_SYMBOL(iscsit_setup_nop_out);
1814
iscsit_process_nop_out(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_nopout * hdr)1815 int iscsit_process_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1816 struct iscsi_nopout *hdr)
1817 {
1818 struct iscsit_cmd *cmd_p = NULL;
1819 int cmdsn_ret = 0;
1820 /*
1821 * Initiator is expecting a NopIN ping reply..
1822 */
1823 if (hdr->itt != RESERVED_ITT) {
1824 if (!cmd)
1825 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1826 (unsigned char *)hdr);
1827
1828 spin_lock_bh(&conn->cmd_lock);
1829 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1830 spin_unlock_bh(&conn->cmd_lock);
1831
1832 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1833
1834 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1835 iscsit_add_cmd_to_response_queue(cmd, conn,
1836 cmd->i_state);
1837 return 0;
1838 }
1839
1840 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1841 (unsigned char *)hdr, hdr->cmdsn);
1842 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1843 return 0;
1844 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1845 return -1;
1846
1847 return 0;
1848 }
1849 /*
1850 * This was a response to a unsolicited NOPIN ping.
1851 */
1852 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1853 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1854 if (!cmd_p)
1855 return -EINVAL;
1856
1857 iscsit_stop_nopin_response_timer(conn);
1858
1859 cmd_p->i_state = ISTATE_REMOVE;
1860 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1861
1862 iscsit_start_nopin_timer(conn);
1863 return 0;
1864 }
1865 /*
1866 * Otherwise, initiator is not expecting a NOPIN is response.
1867 * Just ignore for now.
1868 */
1869
1870 if (cmd)
1871 iscsit_free_cmd(cmd, false);
1872
1873 return 0;
1874 }
1875 EXPORT_SYMBOL(iscsit_process_nop_out);
1876
iscsit_handle_nop_out(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)1877 static int iscsit_handle_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1878 unsigned char *buf)
1879 {
1880 unsigned char *ping_data = NULL;
1881 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1882 struct kvec *iov = NULL;
1883 u32 payload_length = ntoh24(hdr->dlength);
1884 int ret;
1885
1886 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1887 if (ret < 0)
1888 return 0;
1889 /*
1890 * Handle NOP-OUT payload for traditional iSCSI sockets
1891 */
1892 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1893 u32 checksum, data_crc, padding = 0;
1894 int niov = 0, rx_got, rx_size = payload_length;
1895
1896 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1897 if (!ping_data) {
1898 ret = -1;
1899 goto out;
1900 }
1901
1902 iov = &cmd->iov_misc[0];
1903 iov[niov].iov_base = ping_data;
1904 iov[niov++].iov_len = payload_length;
1905
1906 padding = ((-payload_length) & 3);
1907 if (padding != 0) {
1908 pr_debug("Receiving %u additional bytes"
1909 " for padding.\n", padding);
1910 iov[niov].iov_base = &cmd->pad_bytes;
1911 iov[niov++].iov_len = padding;
1912 rx_size += padding;
1913 }
1914 if (conn->conn_ops->DataDigest) {
1915 iov[niov].iov_base = &checksum;
1916 iov[niov++].iov_len = ISCSI_CRC_LEN;
1917 rx_size += ISCSI_CRC_LEN;
1918 }
1919
1920 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc));
1921 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1922 if (rx_got != rx_size) {
1923 ret = -1;
1924 goto out;
1925 }
1926
1927 if (conn->conn_ops->DataDigest) {
1928 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1929 payload_length, padding,
1930 cmd->pad_bytes, &data_crc);
1931
1932 if (checksum != data_crc) {
1933 pr_err("Ping data CRC32C DataDigest"
1934 " 0x%08x does not match computed 0x%08x\n",
1935 checksum, data_crc);
1936 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1937 pr_err("Unable to recover from"
1938 " NOPOUT Ping DataCRC failure while in"
1939 " ERL=0.\n");
1940 ret = -1;
1941 goto out;
1942 } else {
1943 /*
1944 * Silently drop this PDU and let the
1945 * initiator plug the CmdSN gap.
1946 */
1947 pr_debug("Dropping NOPOUT"
1948 " Command CmdSN: 0x%08x due to"
1949 " DataCRC error.\n", hdr->cmdsn);
1950 ret = 0;
1951 goto out;
1952 }
1953 } else {
1954 pr_debug("Got CRC32C DataDigest"
1955 " 0x%08x for %u bytes of ping data.\n",
1956 checksum, payload_length);
1957 }
1958 }
1959
1960 ping_data[payload_length] = '\0';
1961 /*
1962 * Attach ping data to struct iscsit_cmd->buf_ptr.
1963 */
1964 cmd->buf_ptr = ping_data;
1965 cmd->buf_ptr_size = payload_length;
1966
1967 pr_debug("Got %u bytes of NOPOUT ping"
1968 " data.\n", payload_length);
1969 pr_debug("Ping Data: \"%s\"\n", ping_data);
1970 }
1971
1972 return iscsit_process_nop_out(conn, cmd, hdr);
1973 out:
1974 if (cmd)
1975 iscsit_free_cmd(cmd, false);
1976
1977 kfree(ping_data);
1978 return ret;
1979 }
1980
iscsit_convert_tmf(u8 iscsi_tmf)1981 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1982 {
1983 switch (iscsi_tmf) {
1984 case ISCSI_TM_FUNC_ABORT_TASK:
1985 return TMR_ABORT_TASK;
1986 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1987 return TMR_ABORT_TASK_SET;
1988 case ISCSI_TM_FUNC_CLEAR_ACA:
1989 return TMR_CLEAR_ACA;
1990 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1991 return TMR_CLEAR_TASK_SET;
1992 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1993 return TMR_LUN_RESET;
1994 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1995 return TMR_TARGET_WARM_RESET;
1996 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1997 return TMR_TARGET_COLD_RESET;
1998 default:
1999 return TMR_UNKNOWN;
2000 }
2001 }
2002
2003 int
iscsit_handle_task_mgt_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)2004 iscsit_handle_task_mgt_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2005 unsigned char *buf)
2006 {
2007 struct se_tmr_req *se_tmr;
2008 struct iscsi_tmr_req *tmr_req;
2009 struct iscsi_tm *hdr;
2010 int out_of_order_cmdsn = 0, ret;
2011 u8 function, tcm_function = TMR_UNKNOWN;
2012
2013 hdr = (struct iscsi_tm *) buf;
2014 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2015 function = hdr->flags;
2016
2017 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
2018 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
2019 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
2020 hdr->rtt, hdr->refcmdsn, conn->cid);
2021
2022 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2023 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2024 hdr->rtt != RESERVED_ITT)) {
2025 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
2026 hdr->rtt = RESERVED_ITT;
2027 }
2028
2029 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
2030 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2031 pr_err("Task Management Request TASK_REASSIGN not"
2032 " issued as immediate command, bad iSCSI Initiator"
2033 "implementation\n");
2034 return iscsit_add_reject_cmd(cmd,
2035 ISCSI_REASON_PROTOCOL_ERROR, buf);
2036 }
2037 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2038 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
2039 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
2040
2041 cmd->data_direction = DMA_NONE;
2042 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
2043 if (!cmd->tmr_req) {
2044 return iscsit_add_reject_cmd(cmd,
2045 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2046 buf);
2047 }
2048
2049 __target_init_cmd(&cmd->se_cmd, &iscsi_ops,
2050 conn->sess->se_sess, 0, DMA_NONE,
2051 TCM_SIMPLE_TAG, cmd->sense_buffer + 2,
2052 scsilun_to_int(&hdr->lun),
2053 conn->cmd_cnt);
2054
2055 target_get_sess_cmd(&cmd->se_cmd, true);
2056
2057 /*
2058 * TASK_REASSIGN for ERL=2 / connection stays inside of
2059 * LIO-Target $FABRIC_MOD
2060 */
2061 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2062 tcm_function = iscsit_convert_tmf(function);
2063 if (tcm_function == TMR_UNKNOWN) {
2064 pr_err("Unknown iSCSI TMR Function:"
2065 " 0x%02x\n", function);
2066 return iscsit_add_reject_cmd(cmd,
2067 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2068 }
2069 }
2070 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2071 GFP_KERNEL);
2072 if (ret < 0)
2073 return iscsit_add_reject_cmd(cmd,
2074 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2075
2076 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2077
2078 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2079 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2080 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2081 cmd->init_task_tag = hdr->itt;
2082 cmd->targ_xfer_tag = 0xFFFFFFFF;
2083 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2084 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2085 se_tmr = cmd->se_cmd.se_tmr_req;
2086 tmr_req = cmd->tmr_req;
2087 /*
2088 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2089 */
2090 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2091 ret = transport_lookup_tmr_lun(&cmd->se_cmd);
2092 if (ret < 0) {
2093 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2094 goto attach;
2095 }
2096 }
2097
2098 switch (function) {
2099 case ISCSI_TM_FUNC_ABORT_TASK:
2100 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2101 if (se_tmr->response)
2102 goto attach;
2103 break;
2104 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2105 case ISCSI_TM_FUNC_CLEAR_ACA:
2106 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2107 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2108 break;
2109 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2110 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2111 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2112 goto attach;
2113 }
2114 break;
2115 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2116 if (iscsit_tmr_task_cold_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_TASK_REASSIGN:
2122 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2123 /*
2124 * Perform sanity checks on the ExpDataSN only if the
2125 * TASK_REASSIGN was successful.
2126 */
2127 if (se_tmr->response)
2128 break;
2129
2130 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2131 return iscsit_add_reject_cmd(cmd,
2132 ISCSI_REASON_BOOKMARK_INVALID, buf);
2133 break;
2134 default:
2135 pr_err("Unknown TMR function: 0x%02x, protocol"
2136 " error.\n", function);
2137 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2138 goto attach;
2139 }
2140
2141 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2142 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2143 se_tmr->call_transport = 1;
2144 attach:
2145 spin_lock_bh(&conn->cmd_lock);
2146 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2147 spin_unlock_bh(&conn->cmd_lock);
2148
2149 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2150 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2151 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2152 out_of_order_cmdsn = 1;
2153 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2154 target_put_sess_cmd(&cmd->se_cmd);
2155 return 0;
2156 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2157 return -1;
2158 }
2159 }
2160 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2161
2162 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2163 return 0;
2164 /*
2165 * Found the referenced task, send to transport for processing.
2166 */
2167 if (se_tmr->call_transport)
2168 return transport_generic_handle_tmr(&cmd->se_cmd);
2169
2170 /*
2171 * Could not find the referenced LUN, task, or Task Management
2172 * command not authorized or supported. Change state and
2173 * let the tx_thread send the response.
2174 *
2175 * For connection recovery, this is also the default action for
2176 * TMR TASK_REASSIGN.
2177 */
2178 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2179 target_put_sess_cmd(&cmd->se_cmd);
2180 return 0;
2181 }
2182 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2183
2184 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2185 int
iscsit_setup_text_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_text * hdr)2186 iscsit_setup_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2187 struct iscsi_text *hdr)
2188 {
2189 u32 payload_length = ntoh24(hdr->dlength);
2190
2191 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2192 pr_err("Unable to accept text parameter length: %u"
2193 "greater than MaxXmitDataSegmentLength %u.\n",
2194 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2195 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2196 (unsigned char *)hdr);
2197 }
2198
2199 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2200 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2201 pr_err("Multi sequence text commands currently not supported\n");
2202 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2203 (unsigned char *)hdr);
2204 }
2205
2206 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2207 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2208 hdr->exp_statsn, payload_length);
2209
2210 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2211 cmd->i_state = ISTATE_SEND_TEXTRSP;
2212 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2213 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2214 cmd->targ_xfer_tag = 0xFFFFFFFF;
2215 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2216 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2217 cmd->data_direction = DMA_NONE;
2218 kfree(cmd->text_in_ptr);
2219 cmd->text_in_ptr = NULL;
2220
2221 return 0;
2222 }
2223 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2224
2225 int
iscsit_process_text_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_text * hdr)2226 iscsit_process_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2227 struct iscsi_text *hdr)
2228 {
2229 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2230 int cmdsn_ret;
2231
2232 if (!text_in) {
2233 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2234 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2235 pr_err("Unable to locate text_in buffer for sendtargets"
2236 " discovery\n");
2237 goto reject;
2238 }
2239 goto empty_sendtargets;
2240 }
2241 if (strncmp("SendTargets=", text_in, 12) != 0) {
2242 pr_err("Received Text Data that is not"
2243 " SendTargets, cannot continue.\n");
2244 goto reject;
2245 }
2246 /* '=' confirmed in strncmp */
2247 text_ptr = strchr(text_in, '=');
2248 BUG_ON(!text_ptr);
2249 if (!strncmp("=All", text_ptr, 5)) {
2250 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2251 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2252 !strncmp("=eui.", text_ptr, 5)) {
2253 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2254 } else {
2255 pr_err("Unable to locate valid SendTargets%s value\n",
2256 text_ptr);
2257 goto reject;
2258 }
2259
2260 spin_lock_bh(&conn->cmd_lock);
2261 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2262 spin_unlock_bh(&conn->cmd_lock);
2263
2264 empty_sendtargets:
2265 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2266
2267 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2268 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2269 (unsigned char *)hdr, hdr->cmdsn);
2270 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2271 return -1;
2272
2273 return 0;
2274 }
2275
2276 return iscsit_execute_cmd(cmd, 0);
2277
2278 reject:
2279 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2280 (unsigned char *)hdr);
2281 }
2282 EXPORT_SYMBOL(iscsit_process_text_cmd);
2283
2284 static int
iscsit_handle_text_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)2285 iscsit_handle_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2286 unsigned char *buf)
2287 {
2288 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2289 char *text_in = NULL;
2290 u32 payload_length = ntoh24(hdr->dlength);
2291 int rx_size, rc;
2292
2293 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2294 if (rc < 0)
2295 return 0;
2296
2297 rx_size = payload_length;
2298 if (payload_length) {
2299 u32 checksum = 0, data_crc = 0;
2300 u32 padding = 0;
2301 int niov = 0, rx_got;
2302 struct kvec iov[2];
2303
2304 rx_size = ALIGN(payload_length, 4);
2305 text_in = kzalloc(rx_size, GFP_KERNEL);
2306 if (!text_in)
2307 goto reject;
2308
2309 cmd->text_in_ptr = text_in;
2310
2311 memset(iov, 0, sizeof(iov));
2312 iov[niov].iov_base = text_in;
2313 iov[niov++].iov_len = rx_size;
2314
2315 padding = rx_size - payload_length;
2316 if (padding)
2317 pr_debug("Receiving %u additional bytes"
2318 " for padding.\n", padding);
2319 if (conn->conn_ops->DataDigest) {
2320 iov[niov].iov_base = &checksum;
2321 iov[niov++].iov_len = ISCSI_CRC_LEN;
2322 rx_size += ISCSI_CRC_LEN;
2323 }
2324
2325 WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
2326 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2327 if (rx_got != rx_size)
2328 goto reject;
2329
2330 if (conn->conn_ops->DataDigest) {
2331 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2332 text_in, rx_size, 0, NULL,
2333 &data_crc);
2334
2335 if (checksum != data_crc) {
2336 pr_err("Text data CRC32C DataDigest"
2337 " 0x%08x does not match computed"
2338 " 0x%08x\n", checksum, data_crc);
2339 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2340 pr_err("Unable to recover from"
2341 " Text Data digest failure while in"
2342 " ERL=0.\n");
2343 goto reject;
2344 } else {
2345 /*
2346 * Silently drop this PDU and let the
2347 * initiator plug the CmdSN gap.
2348 */
2349 pr_debug("Dropping Text"
2350 " Command CmdSN: 0x%08x due to"
2351 " DataCRC error.\n", hdr->cmdsn);
2352 kfree(text_in);
2353 return 0;
2354 }
2355 } else {
2356 pr_debug("Got CRC32C DataDigest"
2357 " 0x%08x for %u bytes of text data.\n",
2358 checksum, payload_length);
2359 }
2360 }
2361 text_in[payload_length - 1] = '\0';
2362 pr_debug("Successfully read %d bytes of text"
2363 " data.\n", payload_length);
2364 }
2365
2366 return iscsit_process_text_cmd(conn, cmd, hdr);
2367
2368 reject:
2369 kfree(cmd->text_in_ptr);
2370 cmd->text_in_ptr = NULL;
2371 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2372 }
2373
iscsit_logout_closesession(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2374 int iscsit_logout_closesession(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2375 {
2376 struct iscsit_conn *conn_p;
2377 struct iscsit_session *sess = conn->sess;
2378
2379 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2380 " for SID: %u.\n", conn->cid, conn->sess->sid);
2381
2382 atomic_set(&sess->session_logout, 1);
2383 atomic_set(&conn->conn_logout_remove, 1);
2384 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2385
2386 iscsit_inc_conn_usage_count(conn);
2387 iscsit_inc_session_usage_count(sess);
2388
2389 spin_lock_bh(&sess->conn_lock);
2390 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2391 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2392 continue;
2393
2394 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2395 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2396 }
2397 spin_unlock_bh(&sess->conn_lock);
2398
2399 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2400
2401 return 0;
2402 }
2403
iscsit_logout_closeconnection(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2404 int iscsit_logout_closeconnection(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2405 {
2406 struct iscsit_conn *l_conn;
2407 struct iscsit_session *sess = conn->sess;
2408
2409 pr_debug("Received logout request CLOSECONNECTION for CID:"
2410 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2411
2412 /*
2413 * A Logout Request with a CLOSECONNECTION reason code for a CID
2414 * can arrive on a connection with a differing CID.
2415 */
2416 if (conn->cid == cmd->logout_cid) {
2417 spin_lock_bh(&conn->state_lock);
2418 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2419 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2420
2421 atomic_set(&conn->conn_logout_remove, 1);
2422 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2423 iscsit_inc_conn_usage_count(conn);
2424
2425 spin_unlock_bh(&conn->state_lock);
2426 } else {
2427 /*
2428 * Handle all different cid CLOSECONNECTION requests in
2429 * iscsit_logout_post_handler_diffcid() as to give enough
2430 * time for any non immediate command's CmdSN to be
2431 * acknowledged on the connection in question.
2432 *
2433 * Here we simply make sure the CID is still around.
2434 */
2435 l_conn = iscsit_get_conn_from_cid(sess,
2436 cmd->logout_cid);
2437 if (!l_conn) {
2438 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2439 iscsit_add_cmd_to_response_queue(cmd, conn,
2440 cmd->i_state);
2441 return 0;
2442 }
2443
2444 iscsit_dec_conn_usage_count(l_conn);
2445 }
2446
2447 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2448
2449 return 0;
2450 }
2451
iscsit_logout_removeconnforrecovery(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2452 int iscsit_logout_removeconnforrecovery(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2453 {
2454 struct iscsit_session *sess = conn->sess;
2455
2456 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2457 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2458
2459 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2460 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2461 " while ERL!=2.\n");
2462 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2463 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2464 return 0;
2465 }
2466
2467 if (conn->cid == cmd->logout_cid) {
2468 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2469 " with CID: %hu on CID: %hu, implementation error.\n",
2470 cmd->logout_cid, conn->cid);
2471 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2472 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2473 return 0;
2474 }
2475
2476 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2477
2478 return 0;
2479 }
2480
2481 int
iscsit_handle_logout_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)2482 iscsit_handle_logout_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2483 unsigned char *buf)
2484 {
2485 int cmdsn_ret, logout_remove = 0;
2486 u8 reason_code = 0;
2487 struct iscsi_logout *hdr;
2488 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2489
2490 hdr = (struct iscsi_logout *) buf;
2491 reason_code = (hdr->flags & 0x7f);
2492
2493 if (tiqn) {
2494 spin_lock(&tiqn->logout_stats.lock);
2495 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2496 tiqn->logout_stats.normal_logouts++;
2497 else
2498 tiqn->logout_stats.abnormal_logouts++;
2499 spin_unlock(&tiqn->logout_stats.lock);
2500 }
2501
2502 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2503 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2504 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2505 hdr->cid, conn->cid);
2506
2507 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2508 pr_err("Received logout request on connection that"
2509 " is not in logged in state, ignoring request.\n");
2510 iscsit_free_cmd(cmd, false);
2511 return 0;
2512 }
2513
2514 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2515 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2516 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2517 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2518 cmd->targ_xfer_tag = 0xFFFFFFFF;
2519 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2520 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2521 cmd->logout_cid = be16_to_cpu(hdr->cid);
2522 cmd->logout_reason = reason_code;
2523 cmd->data_direction = DMA_NONE;
2524
2525 /*
2526 * We need to sleep in these cases (by returning 1) until the Logout
2527 * Response gets sent in the tx thread.
2528 */
2529 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2530 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2531 be16_to_cpu(hdr->cid) == conn->cid))
2532 logout_remove = 1;
2533
2534 spin_lock_bh(&conn->cmd_lock);
2535 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2536 spin_unlock_bh(&conn->cmd_lock);
2537
2538 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2539 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2540
2541 /*
2542 * Immediate commands are executed, well, immediately.
2543 * Non-Immediate Logout Commands are executed in CmdSN order.
2544 */
2545 if (cmd->immediate_cmd) {
2546 int ret = iscsit_execute_cmd(cmd, 0);
2547
2548 if (ret < 0)
2549 return ret;
2550 } else {
2551 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2552 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2553 logout_remove = 0;
2554 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2555 return -1;
2556 }
2557
2558 return logout_remove;
2559 }
2560 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2561
iscsit_handle_snack(struct iscsit_conn * conn,unsigned char * buf)2562 int iscsit_handle_snack(
2563 struct iscsit_conn *conn,
2564 unsigned char *buf)
2565 {
2566 struct iscsi_snack *hdr;
2567
2568 hdr = (struct iscsi_snack *) buf;
2569 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2570
2571 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2572 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2573 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2574 hdr->begrun, hdr->runlength, conn->cid);
2575
2576 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2577 pr_err("Initiator sent SNACK request while in"
2578 " ErrorRecoveryLevel=0.\n");
2579 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2580 buf);
2581 }
2582 /*
2583 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2584 * call from inside iscsi_send_recovery_datain_or_r2t().
2585 */
2586 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2587 case 0:
2588 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2589 hdr->itt,
2590 be32_to_cpu(hdr->ttt),
2591 be32_to_cpu(hdr->begrun),
2592 be32_to_cpu(hdr->runlength));
2593 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2594 return iscsit_handle_status_snack(conn, hdr->itt,
2595 be32_to_cpu(hdr->ttt),
2596 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2597 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2598 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2599 be32_to_cpu(hdr->begrun),
2600 be32_to_cpu(hdr->runlength));
2601 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2602 /* FIXME: Support R-Data SNACK */
2603 pr_err("R-Data SNACK Not Supported.\n");
2604 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2605 buf);
2606 default:
2607 pr_err("Unknown SNACK type 0x%02x, protocol"
2608 " error.\n", hdr->flags & 0x0f);
2609 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2610 buf);
2611 }
2612
2613 return 0;
2614 }
2615 EXPORT_SYMBOL(iscsit_handle_snack);
2616
iscsit_rx_thread_wait_for_tcp(struct iscsit_conn * conn)2617 static void iscsit_rx_thread_wait_for_tcp(struct iscsit_conn *conn)
2618 {
2619 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2620 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2621 wait_for_completion_interruptible_timeout(
2622 &conn->rx_half_close_comp,
2623 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2624 }
2625 }
2626
iscsit_handle_immediate_data(struct iscsit_cmd * cmd,struct iscsi_scsi_req * hdr,u32 length)2627 static int iscsit_handle_immediate_data(
2628 struct iscsit_cmd *cmd,
2629 struct iscsi_scsi_req *hdr,
2630 u32 length)
2631 {
2632 int iov_ret, rx_got = 0, rx_size = 0;
2633 u32 checksum, iov_count = 0, padding = 0;
2634 struct iscsit_conn *conn = cmd->conn;
2635 struct kvec *iov;
2636 void *overflow_buf = NULL;
2637
2638 BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
2639 rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
2640 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
2641 cmd->orig_iov_data_count - 2,
2642 cmd->write_data_done, rx_size);
2643 if (iov_ret < 0)
2644 return IMMEDIATE_DATA_CANNOT_RECOVER;
2645
2646 iov_count = iov_ret;
2647 iov = &cmd->iov_data[0];
2648 if (rx_size < length) {
2649 /*
2650 * Special case: length of immediate data exceeds the data
2651 * buffer size derived from the CDB.
2652 */
2653 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
2654 if (!overflow_buf) {
2655 iscsit_unmap_iovec(cmd);
2656 return IMMEDIATE_DATA_CANNOT_RECOVER;
2657 }
2658 cmd->overflow_buf = overflow_buf;
2659 iov[iov_count].iov_base = overflow_buf;
2660 iov[iov_count].iov_len = length - rx_size;
2661 iov_count++;
2662 rx_size = length;
2663 }
2664
2665 padding = ((-length) & 3);
2666 if (padding != 0) {
2667 iov[iov_count].iov_base = cmd->pad_bytes;
2668 iov[iov_count++].iov_len = padding;
2669 rx_size += padding;
2670 }
2671
2672 if (conn->conn_ops->DataDigest) {
2673 iov[iov_count].iov_base = &checksum;
2674 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2675 rx_size += ISCSI_CRC_LEN;
2676 }
2677
2678 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
2679 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2680
2681 iscsit_unmap_iovec(cmd);
2682
2683 if (rx_got != rx_size) {
2684 iscsit_rx_thread_wait_for_tcp(conn);
2685 return IMMEDIATE_DATA_CANNOT_RECOVER;
2686 }
2687
2688 if (conn->conn_ops->DataDigest) {
2689 u32 data_crc;
2690
2691 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2692 cmd->write_data_done, length, padding,
2693 cmd->pad_bytes);
2694
2695 if (checksum != data_crc) {
2696 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2697 " does not match computed 0x%08x\n", checksum,
2698 data_crc);
2699
2700 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2701 pr_err("Unable to recover from"
2702 " Immediate Data digest failure while"
2703 " in ERL=0.\n");
2704 iscsit_reject_cmd(cmd,
2705 ISCSI_REASON_DATA_DIGEST_ERROR,
2706 (unsigned char *)hdr);
2707 return IMMEDIATE_DATA_CANNOT_RECOVER;
2708 } else {
2709 iscsit_reject_cmd(cmd,
2710 ISCSI_REASON_DATA_DIGEST_ERROR,
2711 (unsigned char *)hdr);
2712 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2713 }
2714 } else {
2715 pr_debug("Got CRC32C DataDigest 0x%08x for"
2716 " %u bytes of Immediate Data\n", checksum,
2717 length);
2718 }
2719 }
2720
2721 cmd->write_data_done += length;
2722
2723 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2724 spin_lock_bh(&cmd->istate_lock);
2725 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2726 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2727 spin_unlock_bh(&cmd->istate_lock);
2728 }
2729
2730 return IMMEDIATE_DATA_NORMAL_OPERATION;
2731 }
2732
2733 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2734 with active network interface */
iscsit_build_conn_drop_async_message(struct iscsit_conn * conn)2735 static void iscsit_build_conn_drop_async_message(struct iscsit_conn *conn)
2736 {
2737 struct iscsit_cmd *cmd;
2738 struct iscsit_conn *conn_p;
2739 bool found = false;
2740
2741 lockdep_assert_held(&conn->sess->conn_lock);
2742
2743 /*
2744 * Only send a Asynchronous Message on connections whos network
2745 * interface is still functional.
2746 */
2747 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2748 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2749 iscsit_inc_conn_usage_count(conn_p);
2750 found = true;
2751 break;
2752 }
2753 }
2754
2755 if (!found)
2756 return;
2757
2758 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2759 if (!cmd) {
2760 iscsit_dec_conn_usage_count(conn_p);
2761 return;
2762 }
2763
2764 cmd->logout_cid = conn->cid;
2765 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2766 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2767
2768 spin_lock_bh(&conn_p->cmd_lock);
2769 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2770 spin_unlock_bh(&conn_p->cmd_lock);
2771
2772 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2773 iscsit_dec_conn_usage_count(conn_p);
2774 }
2775
iscsit_send_conn_drop_async_message(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2776 static int iscsit_send_conn_drop_async_message(
2777 struct iscsit_cmd *cmd,
2778 struct iscsit_conn *conn)
2779 {
2780 struct iscsi_async *hdr;
2781
2782 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2783
2784 hdr = (struct iscsi_async *) cmd->pdu;
2785 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2786 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2787 cmd->init_task_tag = RESERVED_ITT;
2788 cmd->targ_xfer_tag = 0xFFFFFFFF;
2789 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2790 cmd->stat_sn = conn->stat_sn++;
2791 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2792 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2793 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2794 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2795 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2796 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2797 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2798
2799 pr_debug("Sending Connection Dropped Async Message StatSN:"
2800 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2801 cmd->logout_cid, conn->cid);
2802
2803 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2804 }
2805
iscsit_tx_thread_wait_for_tcp(struct iscsit_conn * conn)2806 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *conn)
2807 {
2808 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2809 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2810 wait_for_completion_interruptible_timeout(
2811 &conn->tx_half_close_comp,
2812 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2813 }
2814 }
2815
2816 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)2817 iscsit_build_datain_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2818 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2819 bool set_statsn)
2820 {
2821 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2822 hdr->flags = datain->flags;
2823 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2824 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2825 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2826 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2827 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2828 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2829 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2830 }
2831 }
2832 hton24(hdr->dlength, datain->length);
2833 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2834 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2835 (struct scsi_lun *)&hdr->lun);
2836 else
2837 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2838
2839 hdr->itt = cmd->init_task_tag;
2840
2841 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2842 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2843 else
2844 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2845 if (set_statsn)
2846 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2847 else
2848 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2849
2850 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2851 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2852 hdr->datasn = cpu_to_be32(datain->data_sn);
2853 hdr->offset = cpu_to_be32(datain->offset);
2854
2855 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2856 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2857 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2858 ntohl(hdr->offset), datain->length, conn->cid);
2859 }
2860 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2861
iscsit_send_datain(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2862 static int iscsit_send_datain(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2863 {
2864 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2865 struct iscsi_datain datain;
2866 struct iscsi_datain_req *dr;
2867 int eodr = 0, ret;
2868 bool set_statsn = false;
2869
2870 memset(&datain, 0, sizeof(struct iscsi_datain));
2871 dr = iscsit_get_datain_values(cmd, &datain);
2872 if (!dr) {
2873 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2874 cmd->init_task_tag);
2875 return -1;
2876 }
2877 /*
2878 * Be paranoid and double check the logic for now.
2879 */
2880 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2881 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2882 " datain.length: %u exceeds cmd->data_length: %u\n",
2883 cmd->init_task_tag, datain.offset, datain.length,
2884 cmd->se_cmd.data_length);
2885 return -1;
2886 }
2887
2888 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2889 /*
2890 * Special case for successfully execution w/ both DATAIN
2891 * and Sense Data.
2892 */
2893 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2894 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2895 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2896 else {
2897 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2898 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2899 iscsit_increment_maxcmdsn(cmd, conn->sess);
2900 cmd->stat_sn = conn->stat_sn++;
2901 set_statsn = true;
2902 } else if (dr->dr_complete ==
2903 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2904 set_statsn = true;
2905 }
2906
2907 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2908
2909 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2910 if (ret < 0)
2911 return ret;
2912
2913 if (dr->dr_complete) {
2914 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2915 2 : 1;
2916 iscsit_free_datain_req(cmd, dr);
2917 }
2918
2919 return eodr;
2920 }
2921
2922 int
iscsit_build_logout_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_logout_rsp * hdr)2923 iscsit_build_logout_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2924 struct iscsi_logout_rsp *hdr)
2925 {
2926 struct iscsit_conn *logout_conn = NULL;
2927 struct iscsi_conn_recovery *cr = NULL;
2928 struct iscsit_session *sess = conn->sess;
2929 /*
2930 * The actual shutting down of Sessions and/or Connections
2931 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2932 * is done in scsi_logout_post_handler().
2933 */
2934 switch (cmd->logout_reason) {
2935 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2936 pr_debug("iSCSI session logout successful, setting"
2937 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2938 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2939 break;
2940 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2941 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2942 break;
2943 /*
2944 * For CLOSECONNECTION logout requests carrying
2945 * a matching logout CID -> local CID, the reference
2946 * for the local CID will have been incremented in
2947 * iscsi_logout_closeconnection().
2948 *
2949 * For CLOSECONNECTION logout requests carrying
2950 * a different CID than the connection it arrived
2951 * on, the connection responding to cmd->logout_cid
2952 * is stopped in iscsit_logout_post_handler_diffcid().
2953 */
2954
2955 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2956 " successful.\n", cmd->logout_cid, conn->cid);
2957 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2958 break;
2959 case ISCSI_LOGOUT_REASON_RECOVERY:
2960 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2961 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2962 break;
2963 /*
2964 * If the connection is still active from our point of view
2965 * force connection recovery to occur.
2966 */
2967 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2968 cmd->logout_cid);
2969 if (logout_conn) {
2970 iscsit_connection_reinstatement_rcfr(logout_conn);
2971 iscsit_dec_conn_usage_count(logout_conn);
2972 }
2973
2974 cr = iscsit_get_inactive_connection_recovery_entry(
2975 conn->sess, cmd->logout_cid);
2976 if (!cr) {
2977 pr_err("Unable to locate CID: %hu for"
2978 " REMOVECONNFORRECOVERY Logout Request.\n",
2979 cmd->logout_cid);
2980 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2981 break;
2982 }
2983
2984 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2985
2986 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2987 " for recovery for CID: %hu on CID: %hu successful.\n",
2988 cmd->logout_cid, conn->cid);
2989 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2990 break;
2991 default:
2992 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2993 cmd->logout_reason);
2994 return -1;
2995 }
2996
2997 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2998 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2999 hdr->response = cmd->logout_response;
3000 hdr->itt = cmd->init_task_tag;
3001 cmd->stat_sn = conn->stat_sn++;
3002 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3003
3004 iscsit_increment_maxcmdsn(cmd, conn->sess);
3005 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3006 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3007
3008 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
3009 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
3010 cmd->init_task_tag, cmd->stat_sn, hdr->response,
3011 cmd->logout_cid, conn->cid);
3012
3013 return 0;
3014 }
3015 EXPORT_SYMBOL(iscsit_build_logout_rsp);
3016
3017 static int
iscsit_send_logout(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3018 iscsit_send_logout(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3019 {
3020 int rc;
3021
3022 rc = iscsit_build_logout_rsp(cmd, conn,
3023 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
3024 if (rc < 0)
3025 return rc;
3026
3027 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3028 }
3029
3030 void
iscsit_build_nopin_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_nopin * hdr,bool nopout_response)3031 iscsit_build_nopin_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3032 struct iscsi_nopin *hdr, bool nopout_response)
3033 {
3034 hdr->opcode = ISCSI_OP_NOOP_IN;
3035 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3036 hton24(hdr->dlength, cmd->buf_ptr_size);
3037 if (nopout_response)
3038 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
3039 hdr->itt = cmd->init_task_tag;
3040 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3041 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
3042 conn->stat_sn;
3043 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3044
3045 if (nopout_response)
3046 iscsit_increment_maxcmdsn(cmd, conn->sess);
3047
3048 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3049 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3050
3051 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3052 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3053 "Solicited" : "Unsolicited", cmd->init_task_tag,
3054 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3055 }
3056 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3057
3058 /*
3059 * Unsolicited NOPIN, either requesting a response or not.
3060 */
iscsit_send_unsolicited_nopin(struct iscsit_cmd * cmd,struct iscsit_conn * conn,int want_response)3061 static int iscsit_send_unsolicited_nopin(
3062 struct iscsit_cmd *cmd,
3063 struct iscsit_conn *conn,
3064 int want_response)
3065 {
3066 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3067 int ret;
3068
3069 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3070
3071 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3072 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3073
3074 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3075 if (ret < 0)
3076 return ret;
3077
3078 spin_lock_bh(&cmd->istate_lock);
3079 cmd->i_state = want_response ?
3080 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3081 spin_unlock_bh(&cmd->istate_lock);
3082
3083 return 0;
3084 }
3085
3086 static int
iscsit_send_nopin(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3087 iscsit_send_nopin(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3088 {
3089 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3090
3091 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3092
3093 /*
3094 * NOPOUT Ping Data is attached to struct iscsit_cmd->buf_ptr.
3095 * NOPOUT DataSegmentLength is at struct iscsit_cmd->buf_ptr_size.
3096 */
3097 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3098
3099 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3100 cmd->buf_ptr,
3101 cmd->buf_ptr_size);
3102 }
3103
iscsit_send_r2t(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3104 static int iscsit_send_r2t(
3105 struct iscsit_cmd *cmd,
3106 struct iscsit_conn *conn)
3107 {
3108 struct iscsi_r2t *r2t;
3109 struct iscsi_r2t_rsp *hdr;
3110 int ret;
3111
3112 r2t = iscsit_get_r2t_from_list(cmd);
3113 if (!r2t)
3114 return -1;
3115
3116 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3117 memset(hdr, 0, ISCSI_HDR_LEN);
3118 hdr->opcode = ISCSI_OP_R2T;
3119 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3120 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3121 (struct scsi_lun *)&hdr->lun);
3122 hdr->itt = cmd->init_task_tag;
3123 if (conn->conn_transport->iscsit_get_r2t_ttt)
3124 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3125 else
3126 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3127 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3128 hdr->statsn = cpu_to_be32(conn->stat_sn);
3129 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3130 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3131 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3132 hdr->data_offset = cpu_to_be32(r2t->offset);
3133 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3134
3135 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3136 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3137 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3138 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3139 r2t->offset, r2t->xfer_len, conn->cid);
3140
3141 spin_lock_bh(&cmd->r2t_lock);
3142 r2t->sent_r2t = 1;
3143 spin_unlock_bh(&cmd->r2t_lock);
3144
3145 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3146 if (ret < 0) {
3147 return ret;
3148 }
3149
3150 spin_lock_bh(&cmd->dataout_timeout_lock);
3151 iscsit_start_dataout_timer(cmd, conn);
3152 spin_unlock_bh(&cmd->dataout_timeout_lock);
3153
3154 return 0;
3155 }
3156
3157 /*
3158 * @recovery: If called from iscsi_task_reassign_complete_write() for
3159 * connection recovery.
3160 */
iscsit_build_r2ts_for_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,bool recovery)3161 int iscsit_build_r2ts_for_cmd(
3162 struct iscsit_conn *conn,
3163 struct iscsit_cmd *cmd,
3164 bool recovery)
3165 {
3166 int first_r2t = 1;
3167 u32 offset = 0, xfer_len = 0;
3168
3169 spin_lock_bh(&cmd->r2t_lock);
3170 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3171 spin_unlock_bh(&cmd->r2t_lock);
3172 return 0;
3173 }
3174
3175 if (conn->sess->sess_ops->DataSequenceInOrder &&
3176 !recovery)
3177 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3178
3179 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3180 if (conn->sess->sess_ops->DataSequenceInOrder) {
3181 offset = cmd->r2t_offset;
3182
3183 if (first_r2t && recovery) {
3184 int new_data_end = offset +
3185 conn->sess->sess_ops->MaxBurstLength -
3186 cmd->next_burst_len;
3187
3188 if (new_data_end > cmd->se_cmd.data_length)
3189 xfer_len = cmd->se_cmd.data_length - offset;
3190 else
3191 xfer_len =
3192 conn->sess->sess_ops->MaxBurstLength -
3193 cmd->next_burst_len;
3194 } else {
3195 int new_data_end = offset +
3196 conn->sess->sess_ops->MaxBurstLength;
3197
3198 if (new_data_end > cmd->se_cmd.data_length)
3199 xfer_len = cmd->se_cmd.data_length - offset;
3200 else
3201 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3202 }
3203
3204 if ((s32)xfer_len < 0) {
3205 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3206 break;
3207 }
3208
3209 cmd->r2t_offset += xfer_len;
3210
3211 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3212 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3213 } else {
3214 struct iscsi_seq *seq;
3215
3216 seq = iscsit_get_seq_holder_for_r2t(cmd);
3217 if (!seq) {
3218 spin_unlock_bh(&cmd->r2t_lock);
3219 return -1;
3220 }
3221
3222 offset = seq->offset;
3223 xfer_len = seq->xfer_len;
3224
3225 if (cmd->seq_send_order == cmd->seq_count)
3226 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3227 }
3228 cmd->outstanding_r2ts++;
3229 first_r2t = 0;
3230
3231 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3232 spin_unlock_bh(&cmd->r2t_lock);
3233 return -1;
3234 }
3235
3236 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3237 break;
3238 }
3239 spin_unlock_bh(&cmd->r2t_lock);
3240
3241 return 0;
3242 }
3243 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3244
iscsit_build_rsp_pdu(struct iscsit_cmd * cmd,struct iscsit_conn * conn,bool inc_stat_sn,struct iscsi_scsi_rsp * hdr)3245 void iscsit_build_rsp_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3246 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3247 {
3248 if (inc_stat_sn)
3249 cmd->stat_sn = conn->stat_sn++;
3250
3251 atomic_long_inc(&conn->sess->rsp_pdus);
3252
3253 memset(hdr, 0, ISCSI_HDR_LEN);
3254 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3255 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3256 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3257 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3258 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3259 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3260 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3261 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3262 }
3263 hdr->response = cmd->iscsi_response;
3264 hdr->cmd_status = cmd->se_cmd.scsi_status;
3265 hdr->itt = cmd->init_task_tag;
3266 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3267
3268 iscsit_increment_maxcmdsn(cmd, conn->sess);
3269 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3270 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3271
3272 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3273 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3274 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3275 cmd->se_cmd.scsi_status, conn->cid);
3276 }
3277 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3278
iscsit_send_response(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3279 static int iscsit_send_response(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3280 {
3281 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3282 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3283 void *data_buf = NULL;
3284 u32 padding = 0, data_buf_len = 0;
3285
3286 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3287
3288 /*
3289 * Attach SENSE DATA payload to iSCSI Response PDU
3290 */
3291 if (cmd->se_cmd.sense_buffer &&
3292 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3293 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3294 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3295 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3296
3297 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3298 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3299 data_buf = cmd->sense_buffer;
3300 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3301
3302 if (padding) {
3303 memset(cmd->sense_buffer +
3304 cmd->se_cmd.scsi_sense_length, 0, padding);
3305 pr_debug("Adding %u bytes of padding to"
3306 " SENSE.\n", padding);
3307 }
3308
3309 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3310 " Response PDU\n",
3311 cmd->se_cmd.scsi_sense_length);
3312 }
3313
3314 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3315 data_buf_len);
3316 }
3317
iscsit_convert_tcm_tmr_rsp(struct se_tmr_req * se_tmr)3318 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3319 {
3320 switch (se_tmr->response) {
3321 case TMR_FUNCTION_COMPLETE:
3322 return ISCSI_TMF_RSP_COMPLETE;
3323 case TMR_TASK_DOES_NOT_EXIST:
3324 return ISCSI_TMF_RSP_NO_TASK;
3325 case TMR_LUN_DOES_NOT_EXIST:
3326 return ISCSI_TMF_RSP_NO_LUN;
3327 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3328 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3329 case TMR_FUNCTION_REJECTED:
3330 default:
3331 return ISCSI_TMF_RSP_REJECTED;
3332 }
3333 }
3334
3335 void
iscsit_build_task_mgt_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_tm_rsp * hdr)3336 iscsit_build_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3337 struct iscsi_tm_rsp *hdr)
3338 {
3339 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3340
3341 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3342 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3343 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3344 hdr->itt = cmd->init_task_tag;
3345 cmd->stat_sn = conn->stat_sn++;
3346 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3347
3348 iscsit_increment_maxcmdsn(cmd, conn->sess);
3349 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3350 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3351
3352 pr_debug("Built Task Management Response ITT: 0x%08x,"
3353 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3354 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3355 }
3356 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3357
3358 static int
iscsit_send_task_mgt_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3359 iscsit_send_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3360 {
3361 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3362
3363 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3364
3365 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3366 }
3367
3368 #define SENDTARGETS_BUF_LIMIT 32768U
3369
3370 static int
iscsit_build_sendtargets_response(struct iscsit_cmd * cmd,enum iscsit_transport_type network_transport,int skip_bytes,bool * completed)3371 iscsit_build_sendtargets_response(struct iscsit_cmd *cmd,
3372 enum iscsit_transport_type network_transport,
3373 int skip_bytes, bool *completed)
3374 {
3375 char *payload = NULL;
3376 struct iscsit_conn *conn = cmd->conn;
3377 struct iscsi_portal_group *tpg;
3378 struct iscsi_tiqn *tiqn;
3379 struct iscsi_tpg_np *tpg_np;
3380 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3381 int target_name_printed;
3382 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3383 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3384 bool active;
3385
3386 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3387 SENDTARGETS_BUF_LIMIT);
3388
3389 payload = kzalloc(buffer_len, GFP_KERNEL);
3390 if (!payload)
3391 return -ENOMEM;
3392
3393 /*
3394 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3395 * explicit case..
3396 */
3397 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3398 text_ptr = strchr(text_in, '=');
3399 if (!text_ptr) {
3400 pr_err("Unable to locate '=' string in text_in:"
3401 " %s\n", text_in);
3402 kfree(payload);
3403 return -EINVAL;
3404 }
3405 /*
3406 * Skip over '=' character..
3407 */
3408 text_ptr += 1;
3409 }
3410
3411 spin_lock(&tiqn_lock);
3412 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3413 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3414 strcmp(tiqn->tiqn, text_ptr)) {
3415 continue;
3416 }
3417
3418 target_name_printed = 0;
3419
3420 spin_lock(&tiqn->tiqn_tpg_lock);
3421 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3422
3423 /* If demo_mode_discovery=0 and generate_node_acls=0
3424 * (demo mode dislabed) do not return
3425 * TargetName+TargetAddress unless a NodeACL exists.
3426 */
3427
3428 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3429 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3430 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3431 cmd->conn->sess->sess_ops->InitiatorName))) {
3432 continue;
3433 }
3434
3435 spin_lock(&tpg->tpg_state_lock);
3436 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3437 spin_unlock(&tpg->tpg_state_lock);
3438
3439 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3440 continue;
3441
3442 spin_lock(&tpg->tpg_np_lock);
3443 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3444 tpg_np_list) {
3445 struct iscsi_np *np = tpg_np->tpg_np;
3446 struct sockaddr_storage *sockaddr;
3447
3448 if (np->np_network_transport != network_transport)
3449 continue;
3450
3451 if (!target_name_printed) {
3452 len = sprintf(buf, "TargetName=%s",
3453 tiqn->tiqn);
3454 len += 1;
3455
3456 if ((len + payload_len) > buffer_len) {
3457 spin_unlock(&tpg->tpg_np_lock);
3458 spin_unlock(&tiqn->tiqn_tpg_lock);
3459 end_of_buf = 1;
3460 goto eob;
3461 }
3462
3463 if (skip_bytes && len <= skip_bytes) {
3464 skip_bytes -= len;
3465 } else {
3466 memcpy(payload + payload_len, buf, len);
3467 payload_len += len;
3468 target_name_printed = 1;
3469 if (len > skip_bytes)
3470 skip_bytes = 0;
3471 }
3472 }
3473
3474 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3475 sockaddr = &conn->local_sockaddr;
3476 else
3477 sockaddr = &np->np_sockaddr;
3478
3479 len = sprintf(buf, "TargetAddress="
3480 "%pISpc,%hu",
3481 sockaddr,
3482 tpg->tpgt);
3483 len += 1;
3484
3485 if ((len + payload_len) > buffer_len) {
3486 spin_unlock(&tpg->tpg_np_lock);
3487 spin_unlock(&tiqn->tiqn_tpg_lock);
3488 end_of_buf = 1;
3489 goto eob;
3490 }
3491
3492 if (skip_bytes && len <= skip_bytes) {
3493 skip_bytes -= len;
3494 } else {
3495 memcpy(payload + payload_len, buf, len);
3496 payload_len += len;
3497 if (len > skip_bytes)
3498 skip_bytes = 0;
3499 }
3500 }
3501 spin_unlock(&tpg->tpg_np_lock);
3502 }
3503 spin_unlock(&tiqn->tiqn_tpg_lock);
3504 eob:
3505 if (end_of_buf) {
3506 *completed = false;
3507 break;
3508 }
3509
3510 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3511 break;
3512 }
3513 spin_unlock(&tiqn_lock);
3514
3515 cmd->buf_ptr = payload;
3516
3517 return payload_len;
3518 }
3519
3520 int
iscsit_build_text_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_text_rsp * hdr,enum iscsit_transport_type network_transport)3521 iscsit_build_text_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3522 struct iscsi_text_rsp *hdr,
3523 enum iscsit_transport_type network_transport)
3524 {
3525 int text_length, padding;
3526 bool completed = true;
3527
3528 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3529 cmd->read_data_done,
3530 &completed);
3531 if (text_length < 0)
3532 return text_length;
3533
3534 if (completed) {
3535 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3536 } else {
3537 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3538 cmd->read_data_done += text_length;
3539 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3540 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3541 }
3542 hdr->opcode = ISCSI_OP_TEXT_RSP;
3543 padding = ((-text_length) & 3);
3544 hton24(hdr->dlength, text_length);
3545 hdr->itt = cmd->init_task_tag;
3546 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3547 cmd->stat_sn = conn->stat_sn++;
3548 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3549
3550 iscsit_increment_maxcmdsn(cmd, conn->sess);
3551 /*
3552 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3553 * correctly increment MaxCmdSN for each response answering a
3554 * non immediate text request with a valid CmdSN.
3555 */
3556 cmd->maxcmdsn_inc = 0;
3557 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3558 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3559
3560 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3561 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3562 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3563 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3564 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3565
3566 return text_length + padding;
3567 }
3568 EXPORT_SYMBOL(iscsit_build_text_rsp);
3569
iscsit_send_text_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3570 static int iscsit_send_text_rsp(
3571 struct iscsit_cmd *cmd,
3572 struct iscsit_conn *conn)
3573 {
3574 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3575 int text_length;
3576
3577 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3578 conn->conn_transport->transport_type);
3579 if (text_length < 0)
3580 return text_length;
3581
3582 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3583 cmd->buf_ptr,
3584 text_length);
3585 }
3586
3587 void
iscsit_build_reject(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_reject * hdr)3588 iscsit_build_reject(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3589 struct iscsi_reject *hdr)
3590 {
3591 hdr->opcode = ISCSI_OP_REJECT;
3592 hdr->reason = cmd->reject_reason;
3593 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3594 hton24(hdr->dlength, ISCSI_HDR_LEN);
3595 hdr->ffffffff = cpu_to_be32(0xffffffff);
3596 cmd->stat_sn = conn->stat_sn++;
3597 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3598 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3599 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3600
3601 }
3602 EXPORT_SYMBOL(iscsit_build_reject);
3603
iscsit_send_reject(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3604 static int iscsit_send_reject(
3605 struct iscsit_cmd *cmd,
3606 struct iscsit_conn *conn)
3607 {
3608 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3609
3610 iscsit_build_reject(cmd, conn, hdr);
3611
3612 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3613 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3614
3615 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3616 cmd->buf_ptr,
3617 ISCSI_HDR_LEN);
3618 }
3619
iscsit_thread_get_cpumask(struct iscsit_conn * conn)3620 void iscsit_thread_get_cpumask(struct iscsit_conn *conn)
3621 {
3622 int ord, cpu;
3623 cpumask_var_t conn_allowed_cpumask;
3624
3625 /*
3626 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3627 * within iscsit_start_kthreads()
3628 *
3629 * Here we use bitmap_id to determine which CPU that this
3630 * iSCSI connection's RX/TX threads will be scheduled to
3631 * execute upon.
3632 */
3633 if (!zalloc_cpumask_var(&conn_allowed_cpumask, GFP_KERNEL)) {
3634 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3635 for_each_online_cpu(cpu) {
3636 if (ord-- == 0) {
3637 cpumask_set_cpu(cpu, conn->conn_cpumask);
3638 return;
3639 }
3640 }
3641 } else {
3642 cpumask_and(conn_allowed_cpumask, iscsit_global->allowed_cpumask,
3643 cpu_online_mask);
3644
3645 cpumask_clear(conn->conn_cpumask);
3646 ord = conn->bitmap_id % cpumask_weight(conn_allowed_cpumask);
3647 for_each_cpu(cpu, conn_allowed_cpumask) {
3648 if (ord-- == 0) {
3649 cpumask_set_cpu(cpu, conn->conn_cpumask);
3650 free_cpumask_var(conn_allowed_cpumask);
3651 return;
3652 }
3653 }
3654 free_cpumask_var(conn_allowed_cpumask);
3655 }
3656 /*
3657 * This should never be reached..
3658 */
3659 dump_stack();
3660 cpumask_setall(conn->conn_cpumask);
3661 }
3662
iscsit_thread_reschedule(struct iscsit_conn * conn)3663 static void iscsit_thread_reschedule(struct iscsit_conn *conn)
3664 {
3665 /*
3666 * If iscsit_global->allowed_cpumask modified, reschedule iSCSI
3667 * connection's RX/TX threads update conn->allowed_cpumask.
3668 */
3669 if (!cpumask_equal(iscsit_global->allowed_cpumask,
3670 conn->allowed_cpumask)) {
3671 iscsit_thread_get_cpumask(conn);
3672 conn->conn_tx_reset_cpumask = 1;
3673 conn->conn_rx_reset_cpumask = 1;
3674 cpumask_copy(conn->allowed_cpumask,
3675 iscsit_global->allowed_cpumask);
3676 }
3677 }
3678
iscsit_thread_check_cpumask(struct iscsit_conn * conn,struct task_struct * p,int mode)3679 void iscsit_thread_check_cpumask(
3680 struct iscsit_conn *conn,
3681 struct task_struct *p,
3682 int mode)
3683 {
3684 /*
3685 * The TX and RX threads maybe call iscsit_thread_check_cpumask()
3686 * at the same time. The RX thread might be faster and return from
3687 * iscsit_thread_reschedule() with conn_rx_reset_cpumask set to 0.
3688 * Then the TX thread sets it back to 1.
3689 * The next time the RX thread loops, it sees conn_rx_reset_cpumask
3690 * set to 1 and calls set_cpus_allowed_ptr() again and set it to 0.
3691 */
3692 iscsit_thread_reschedule(conn);
3693
3694 /*
3695 * mode == 1 signals iscsi_target_tx_thread() usage.
3696 * mode == 0 signals iscsi_target_rx_thread() usage.
3697 */
3698 if (mode == 1) {
3699 if (!conn->conn_tx_reset_cpumask)
3700 return;
3701 } else {
3702 if (!conn->conn_rx_reset_cpumask)
3703 return;
3704 }
3705
3706 /*
3707 * Update the CPU mask for this single kthread so that
3708 * both TX and RX kthreads are scheduled to run on the
3709 * same CPU.
3710 */
3711 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3712 if (mode == 1)
3713 conn->conn_tx_reset_cpumask = 0;
3714 else
3715 conn->conn_rx_reset_cpumask = 0;
3716 }
3717 EXPORT_SYMBOL(iscsit_thread_check_cpumask);
3718
3719 int
iscsit_immediate_queue(struct iscsit_conn * conn,struct iscsit_cmd * cmd,int state)3720 iscsit_immediate_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
3721 {
3722 int ret;
3723
3724 switch (state) {
3725 case ISTATE_SEND_R2T:
3726 ret = iscsit_send_r2t(cmd, conn);
3727 if (ret < 0)
3728 goto err;
3729 break;
3730 case ISTATE_REMOVE:
3731 spin_lock_bh(&conn->cmd_lock);
3732 list_del_init(&cmd->i_conn_node);
3733 spin_unlock_bh(&conn->cmd_lock);
3734
3735 iscsit_free_cmd(cmd, false);
3736 break;
3737 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3738 iscsit_mod_nopin_response_timer(conn);
3739 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3740 if (ret < 0)
3741 goto err;
3742 break;
3743 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3744 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3745 if (ret < 0)
3746 goto err;
3747 break;
3748 default:
3749 pr_err("Unknown Opcode: 0x%02x ITT:"
3750 " 0x%08x, i_state: %d on CID: %hu\n",
3751 cmd->iscsi_opcode, cmd->init_task_tag, state,
3752 conn->cid);
3753 goto err;
3754 }
3755
3756 return 0;
3757
3758 err:
3759 return -1;
3760 }
3761 EXPORT_SYMBOL(iscsit_immediate_queue);
3762
3763 static int
iscsit_handle_immediate_queue(struct iscsit_conn * conn)3764 iscsit_handle_immediate_queue(struct iscsit_conn *conn)
3765 {
3766 struct iscsit_transport *t = conn->conn_transport;
3767 struct iscsi_queue_req *qr;
3768 struct iscsit_cmd *cmd;
3769 u8 state;
3770 int ret;
3771
3772 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3773 atomic_set(&conn->check_immediate_queue, 0);
3774 cmd = qr->cmd;
3775 state = qr->state;
3776 kmem_cache_free(lio_qr_cache, qr);
3777
3778 ret = t->iscsit_immediate_queue(conn, cmd, state);
3779 if (ret < 0)
3780 return ret;
3781 }
3782
3783 return 0;
3784 }
3785
3786 int
iscsit_response_queue(struct iscsit_conn * conn,struct iscsit_cmd * cmd,int state)3787 iscsit_response_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
3788 {
3789 int ret;
3790
3791 check_rsp_state:
3792 switch (state) {
3793 case ISTATE_SEND_DATAIN:
3794 ret = iscsit_send_datain(cmd, conn);
3795 if (ret < 0)
3796 goto err;
3797 else if (!ret)
3798 /* more drs */
3799 goto check_rsp_state;
3800 else if (ret == 1) {
3801 /* all done */
3802 spin_lock_bh(&cmd->istate_lock);
3803 cmd->i_state = ISTATE_SENT_STATUS;
3804 spin_unlock_bh(&cmd->istate_lock);
3805
3806 if (atomic_read(&conn->check_immediate_queue))
3807 return 1;
3808
3809 return 0;
3810 } else if (ret == 2) {
3811 /* Still must send status,
3812 SCF_TRANSPORT_TASK_SENSE was set */
3813 spin_lock_bh(&cmd->istate_lock);
3814 cmd->i_state = ISTATE_SEND_STATUS;
3815 spin_unlock_bh(&cmd->istate_lock);
3816 state = ISTATE_SEND_STATUS;
3817 goto check_rsp_state;
3818 }
3819
3820 break;
3821 case ISTATE_SEND_STATUS:
3822 case ISTATE_SEND_STATUS_RECOVERY:
3823 ret = iscsit_send_response(cmd, conn);
3824 break;
3825 case ISTATE_SEND_LOGOUTRSP:
3826 ret = iscsit_send_logout(cmd, conn);
3827 break;
3828 case ISTATE_SEND_ASYNCMSG:
3829 ret = iscsit_send_conn_drop_async_message(
3830 cmd, conn);
3831 break;
3832 case ISTATE_SEND_NOPIN:
3833 ret = iscsit_send_nopin(cmd, conn);
3834 break;
3835 case ISTATE_SEND_REJECT:
3836 ret = iscsit_send_reject(cmd, conn);
3837 break;
3838 case ISTATE_SEND_TASKMGTRSP:
3839 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3840 if (ret != 0)
3841 break;
3842 ret = iscsit_tmr_post_handler(cmd, conn);
3843 if (ret != 0)
3844 iscsit_fall_back_to_erl0(conn->sess);
3845 break;
3846 case ISTATE_SEND_TEXTRSP:
3847 ret = iscsit_send_text_rsp(cmd, conn);
3848 break;
3849 default:
3850 pr_err("Unknown Opcode: 0x%02x ITT:"
3851 " 0x%08x, i_state: %d on CID: %hu\n",
3852 cmd->iscsi_opcode, cmd->init_task_tag,
3853 state, conn->cid);
3854 goto err;
3855 }
3856 if (ret < 0)
3857 goto err;
3858
3859 switch (state) {
3860 case ISTATE_SEND_LOGOUTRSP:
3861 if (!iscsit_logout_post_handler(cmd, conn))
3862 return -ECONNRESET;
3863 fallthrough;
3864 case ISTATE_SEND_STATUS:
3865 case ISTATE_SEND_ASYNCMSG:
3866 case ISTATE_SEND_NOPIN:
3867 case ISTATE_SEND_STATUS_RECOVERY:
3868 case ISTATE_SEND_TEXTRSP:
3869 case ISTATE_SEND_TASKMGTRSP:
3870 case ISTATE_SEND_REJECT:
3871 spin_lock_bh(&cmd->istate_lock);
3872 cmd->i_state = ISTATE_SENT_STATUS;
3873 spin_unlock_bh(&cmd->istate_lock);
3874 break;
3875 default:
3876 pr_err("Unknown Opcode: 0x%02x ITT:"
3877 " 0x%08x, i_state: %d on CID: %hu\n",
3878 cmd->iscsi_opcode, cmd->init_task_tag,
3879 cmd->i_state, conn->cid);
3880 goto err;
3881 }
3882
3883 if (atomic_read(&conn->check_immediate_queue))
3884 return 1;
3885
3886 return 0;
3887
3888 err:
3889 return -1;
3890 }
3891 EXPORT_SYMBOL(iscsit_response_queue);
3892
iscsit_handle_response_queue(struct iscsit_conn * conn)3893 static int iscsit_handle_response_queue(struct iscsit_conn *conn)
3894 {
3895 struct iscsit_transport *t = conn->conn_transport;
3896 struct iscsi_queue_req *qr;
3897 struct iscsit_cmd *cmd;
3898 u8 state;
3899 int ret;
3900
3901 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3902 cmd = qr->cmd;
3903 state = qr->state;
3904 kmem_cache_free(lio_qr_cache, qr);
3905
3906 ret = t->iscsit_response_queue(conn, cmd, state);
3907 if (ret == 1 || ret < 0)
3908 return ret;
3909 }
3910
3911 return 0;
3912 }
3913
iscsi_target_tx_thread(void * arg)3914 int iscsi_target_tx_thread(void *arg)
3915 {
3916 int ret = 0;
3917 struct iscsit_conn *conn = arg;
3918 bool conn_freed = false;
3919
3920 /*
3921 * Allow ourselves to be interrupted by SIGINT so that a
3922 * connection recovery / failure event can be triggered externally.
3923 */
3924 allow_signal(SIGINT);
3925
3926 while (!kthread_should_stop()) {
3927 /*
3928 * Ensure that both TX and RX per connection kthreads
3929 * are scheduled to run on the same CPU.
3930 */
3931 iscsit_thread_check_cpumask(conn, current, 1);
3932
3933 wait_event_interruptible(conn->queues_wq,
3934 !iscsit_conn_all_queues_empty(conn));
3935
3936 if (signal_pending(current))
3937 goto transport_err;
3938
3939 get_immediate:
3940 ret = iscsit_handle_immediate_queue(conn);
3941 if (ret < 0)
3942 goto transport_err;
3943
3944 ret = iscsit_handle_response_queue(conn);
3945 if (ret == 1) {
3946 goto get_immediate;
3947 } else if (ret == -ECONNRESET) {
3948 conn_freed = true;
3949 goto out;
3950 } else if (ret < 0) {
3951 goto transport_err;
3952 }
3953 }
3954
3955 transport_err:
3956 /*
3957 * Avoid the normal connection failure code-path if this connection
3958 * is still within LOGIN mode, and iscsi_np process context is
3959 * responsible for cleaning up the early connection failure.
3960 */
3961 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3962 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3963 out:
3964 if (!conn_freed) {
3965 while (!kthread_should_stop()) {
3966 msleep(100);
3967 }
3968 }
3969 return 0;
3970 }
3971
iscsi_target_rx_opcode(struct iscsit_conn * conn,unsigned char * buf)3972 static int iscsi_target_rx_opcode(struct iscsit_conn *conn, unsigned char *buf)
3973 {
3974 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3975 struct iscsit_cmd *cmd;
3976 int ret = 0;
3977
3978 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3979 case ISCSI_OP_SCSI_CMD:
3980 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3981 if (!cmd)
3982 goto reject;
3983
3984 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3985 break;
3986 case ISCSI_OP_SCSI_DATA_OUT:
3987 ret = iscsit_handle_data_out(conn, buf);
3988 break;
3989 case ISCSI_OP_NOOP_OUT:
3990 cmd = NULL;
3991 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3992 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3993 if (!cmd)
3994 goto reject;
3995 }
3996 ret = iscsit_handle_nop_out(conn, cmd, buf);
3997 break;
3998 case ISCSI_OP_SCSI_TMFUNC:
3999 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4000 if (!cmd)
4001 goto reject;
4002
4003 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4004 break;
4005 case ISCSI_OP_TEXT:
4006 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4007 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4008 if (!cmd)
4009 goto reject;
4010 } else {
4011 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4012 if (!cmd)
4013 goto reject;
4014 }
4015
4016 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4017 break;
4018 case ISCSI_OP_LOGOUT:
4019 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4020 if (!cmd)
4021 goto reject;
4022
4023 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4024 if (ret > 0)
4025 wait_for_completion_timeout(&conn->conn_logout_comp,
4026 SECONDS_FOR_LOGOUT_COMP * HZ);
4027 break;
4028 case ISCSI_OP_SNACK:
4029 ret = iscsit_handle_snack(conn, buf);
4030 break;
4031 default:
4032 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4033 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4034 pr_err("Cannot recover from unknown"
4035 " opcode while ERL=0, closing iSCSI connection.\n");
4036 return -1;
4037 }
4038 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
4039 " closing iSCSI connection.\n");
4040 ret = -1;
4041 break;
4042 }
4043
4044 return ret;
4045 reject:
4046 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4047 }
4048
iscsi_target_check_conn_state(struct iscsit_conn * conn)4049 static bool iscsi_target_check_conn_state(struct iscsit_conn *conn)
4050 {
4051 bool ret;
4052
4053 spin_lock_bh(&conn->state_lock);
4054 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
4055 spin_unlock_bh(&conn->state_lock);
4056
4057 return ret;
4058 }
4059
iscsit_get_rx_pdu(struct iscsit_conn * conn)4060 static void iscsit_get_rx_pdu(struct iscsit_conn *conn)
4061 {
4062 int ret;
4063 u8 *buffer, *tmp_buf, opcode;
4064 u32 checksum = 0, digest = 0;
4065 struct iscsi_hdr *hdr;
4066 struct kvec iov;
4067
4068 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
4069 if (!buffer)
4070 return;
4071
4072 while (!kthread_should_stop()) {
4073 /*
4074 * Ensure that both TX and RX per connection kthreads
4075 * are scheduled to run on the same CPU.
4076 */
4077 iscsit_thread_check_cpumask(conn, current, 0);
4078
4079 memset(&iov, 0, sizeof(struct kvec));
4080
4081 iov.iov_base = buffer;
4082 iov.iov_len = ISCSI_HDR_LEN;
4083
4084 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4085 if (ret != ISCSI_HDR_LEN) {
4086 iscsit_rx_thread_wait_for_tcp(conn);
4087 break;
4088 }
4089
4090 hdr = (struct iscsi_hdr *) buffer;
4091 if (hdr->hlength) {
4092 iov.iov_len = hdr->hlength * 4;
4093 tmp_buf = krealloc(buffer,
4094 ISCSI_HDR_LEN + iov.iov_len,
4095 GFP_KERNEL);
4096 if (!tmp_buf)
4097 break;
4098
4099 buffer = tmp_buf;
4100 iov.iov_base = &buffer[ISCSI_HDR_LEN];
4101
4102 ret = rx_data(conn, &iov, 1, iov.iov_len);
4103 if (ret != iov.iov_len) {
4104 iscsit_rx_thread_wait_for_tcp(conn);
4105 break;
4106 }
4107 }
4108
4109 if (conn->conn_ops->HeaderDigest) {
4110 iov.iov_base = &digest;
4111 iov.iov_len = ISCSI_CRC_LEN;
4112
4113 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4114 if (ret != ISCSI_CRC_LEN) {
4115 iscsit_rx_thread_wait_for_tcp(conn);
4116 break;
4117 }
4118
4119 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
4120 ISCSI_HDR_LEN, 0, NULL,
4121 &checksum);
4122
4123 if (digest != checksum) {
4124 pr_err("HeaderDigest CRC32C failed,"
4125 " received 0x%08x, computed 0x%08x\n",
4126 digest, checksum);
4127 /*
4128 * Set the PDU to 0xff so it will intentionally
4129 * hit default in the switch below.
4130 */
4131 memset(buffer, 0xff, ISCSI_HDR_LEN);
4132 atomic_long_inc(&conn->sess->conn_digest_errors);
4133 } else {
4134 pr_debug("Got HeaderDigest CRC32C"
4135 " 0x%08x\n", checksum);
4136 }
4137 }
4138
4139 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4140 break;
4141
4142 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4143
4144 if (conn->sess->sess_ops->SessionType &&
4145 ((!(opcode & ISCSI_OP_TEXT)) ||
4146 (!(opcode & ISCSI_OP_LOGOUT)))) {
4147 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4148 " while in Discovery Session, rejecting.\n", opcode);
4149 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4150 buffer);
4151 break;
4152 }
4153
4154 ret = iscsi_target_rx_opcode(conn, buffer);
4155 if (ret < 0)
4156 break;
4157 }
4158
4159 kfree(buffer);
4160 }
4161
iscsi_target_rx_thread(void * arg)4162 int iscsi_target_rx_thread(void *arg)
4163 {
4164 int rc;
4165 struct iscsit_conn *conn = arg;
4166 bool conn_freed = false;
4167
4168 /*
4169 * Allow ourselves to be interrupted by SIGINT so that a
4170 * connection recovery / failure event can be triggered externally.
4171 */
4172 allow_signal(SIGINT);
4173 /*
4174 * Wait for iscsi_post_login_handler() to complete before allowing
4175 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4176 */
4177 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4178 if (rc < 0 || iscsi_target_check_conn_state(conn))
4179 goto out;
4180
4181 if (!conn->conn_transport->iscsit_get_rx_pdu)
4182 return 0;
4183
4184 conn->conn_transport->iscsit_get_rx_pdu(conn);
4185
4186 if (!signal_pending(current))
4187 atomic_set(&conn->transport_failed, 1);
4188 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4189
4190 out:
4191 if (!conn_freed) {
4192 while (!kthread_should_stop()) {
4193 msleep(100);
4194 }
4195 }
4196
4197 return 0;
4198 }
4199
iscsit_release_commands_from_conn(struct iscsit_conn * conn)4200 static void iscsit_release_commands_from_conn(struct iscsit_conn *conn)
4201 {
4202 LIST_HEAD(tmp_list);
4203 struct iscsit_cmd *cmd = NULL, *cmd_tmp = NULL;
4204 struct iscsit_session *sess = conn->sess;
4205 /*
4206 * We expect this function to only ever be called from either RX or TX
4207 * thread context via iscsit_close_connection() once the other context
4208 * has been reset -> returned sleeping pre-handler state.
4209 */
4210 spin_lock_bh(&conn->cmd_lock);
4211 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4212
4213 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4214 struct se_cmd *se_cmd = &cmd->se_cmd;
4215
4216 if (!se_cmd->se_tfo)
4217 continue;
4218
4219 spin_lock_irq(&se_cmd->t_state_lock);
4220 if (se_cmd->transport_state & CMD_T_ABORTED) {
4221 if (!(se_cmd->transport_state & CMD_T_TAS))
4222 /*
4223 * LIO's abort path owns the cleanup for this,
4224 * so put it back on the list and let
4225 * aborted_task handle it.
4226 */
4227 list_move_tail(&cmd->i_conn_node,
4228 &conn->conn_cmd_list);
4229 } else {
4230 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4231 }
4232
4233 if (cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
4234 /*
4235 * We never submitted the cmd to LIO core, so we have
4236 * to tell LIO to perform the completion process.
4237 */
4238 spin_unlock_irq(&se_cmd->t_state_lock);
4239 target_complete_cmd(&cmd->se_cmd, SAM_STAT_TASK_ABORTED);
4240 continue;
4241 }
4242 spin_unlock_irq(&se_cmd->t_state_lock);
4243 }
4244 spin_unlock_bh(&conn->cmd_lock);
4245
4246 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4247 list_del_init(&cmd->i_conn_node);
4248
4249 iscsit_increment_maxcmdsn(cmd, sess);
4250 iscsit_free_cmd(cmd, true);
4251
4252 }
4253
4254 /*
4255 * Wait on commands that were cleaned up via the aborted_task path.
4256 * LLDs that implement iscsit_wait_conn will already have waited for
4257 * commands.
4258 */
4259 if (!conn->conn_transport->iscsit_wait_conn) {
4260 target_stop_cmd_counter(conn->cmd_cnt);
4261 target_wait_for_cmds(conn->cmd_cnt);
4262 }
4263 }
4264
iscsit_stop_timers_for_cmds(struct iscsit_conn * conn)4265 static void iscsit_stop_timers_for_cmds(
4266 struct iscsit_conn *conn)
4267 {
4268 struct iscsit_cmd *cmd;
4269
4270 spin_lock_bh(&conn->cmd_lock);
4271 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4272 if (cmd->data_direction == DMA_TO_DEVICE)
4273 iscsit_stop_dataout_timer(cmd);
4274 }
4275 spin_unlock_bh(&conn->cmd_lock);
4276 }
4277
iscsit_close_connection(struct iscsit_conn * conn)4278 int iscsit_close_connection(
4279 struct iscsit_conn *conn)
4280 {
4281 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4282 struct iscsit_session *sess = conn->sess;
4283
4284 pr_debug("Closing iSCSI connection CID %hu on SID:"
4285 " %u\n", conn->cid, sess->sid);
4286 /*
4287 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4288 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4289 * sleeping and the logout response never got sent because the
4290 * connection failed.
4291 *
4292 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4293 * to signal logout response TX interrupt completion. Go ahead and skip
4294 * this for iser since isert_rx_opcode() does not wait on logout failure,
4295 * and to avoid iscsit_conn pointer dereference in iser-target code.
4296 */
4297 if (!conn->conn_transport->rdma_shutdown)
4298 complete(&conn->conn_logout_comp);
4299
4300 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4301 if (conn->tx_thread &&
4302 cmpxchg(&conn->tx_thread_active, true, false)) {
4303 send_sig(SIGINT, conn->tx_thread, 1);
4304 kthread_stop(conn->tx_thread);
4305 }
4306 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4307 if (conn->rx_thread &&
4308 cmpxchg(&conn->rx_thread_active, true, false)) {
4309 send_sig(SIGINT, conn->rx_thread, 1);
4310 kthread_stop(conn->rx_thread);
4311 }
4312 }
4313
4314 spin_lock(&iscsit_global->ts_bitmap_lock);
4315 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4316 get_order(1));
4317 spin_unlock(&iscsit_global->ts_bitmap_lock);
4318
4319 iscsit_stop_timers_for_cmds(conn);
4320 iscsit_stop_nopin_response_timer(conn);
4321 iscsit_stop_nopin_timer(conn);
4322
4323 if (conn->conn_transport->iscsit_wait_conn)
4324 conn->conn_transport->iscsit_wait_conn(conn);
4325
4326 /*
4327 * During Connection recovery drop unacknowledged out of order
4328 * commands for this connection, and prepare the other commands
4329 * for reallegiance.
4330 *
4331 * During normal operation clear the out of order commands (but
4332 * do not free the struct iscsi_ooo_cmdsn's) and release all
4333 * struct iscsit_cmds.
4334 */
4335 if (atomic_read(&conn->connection_recovery)) {
4336 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4337 iscsit_prepare_cmds_for_reallegiance(conn);
4338 } else {
4339 iscsit_clear_ooo_cmdsns_for_conn(conn);
4340 iscsit_release_commands_from_conn(conn);
4341 }
4342 iscsit_free_queue_reqs_for_conn(conn);
4343
4344 /*
4345 * Handle decrementing session or connection usage count if
4346 * a logout response was not able to be sent because the
4347 * connection failed. Fall back to Session Recovery here.
4348 */
4349 if (atomic_read(&conn->conn_logout_remove)) {
4350 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4351 iscsit_dec_conn_usage_count(conn);
4352 iscsit_dec_session_usage_count(sess);
4353 }
4354 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4355 iscsit_dec_conn_usage_count(conn);
4356
4357 atomic_set(&conn->conn_logout_remove, 0);
4358 atomic_set(&sess->session_reinstatement, 0);
4359 atomic_set(&sess->session_fall_back_to_erl0, 1);
4360 }
4361
4362 spin_lock_bh(&sess->conn_lock);
4363 list_del(&conn->conn_list);
4364
4365 /*
4366 * Attempt to let the Initiator know this connection failed by
4367 * sending an Connection Dropped Async Message on another
4368 * active connection.
4369 */
4370 if (atomic_read(&conn->connection_recovery))
4371 iscsit_build_conn_drop_async_message(conn);
4372
4373 spin_unlock_bh(&sess->conn_lock);
4374
4375 /*
4376 * If connection reinstatement is being performed on this connection,
4377 * up the connection reinstatement semaphore that is being blocked on
4378 * in iscsit_cause_connection_reinstatement().
4379 */
4380 spin_lock_bh(&conn->state_lock);
4381 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4382 spin_unlock_bh(&conn->state_lock);
4383 complete(&conn->conn_wait_comp);
4384 wait_for_completion(&conn->conn_post_wait_comp);
4385 spin_lock_bh(&conn->state_lock);
4386 }
4387
4388 /*
4389 * If connection reinstatement is being performed on this connection
4390 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4391 * connection wait rcfr semaphore that is being blocked on
4392 * an iscsit_connection_reinstatement_rcfr().
4393 */
4394 if (atomic_read(&conn->connection_wait_rcfr)) {
4395 spin_unlock_bh(&conn->state_lock);
4396 complete(&conn->conn_wait_rcfr_comp);
4397 wait_for_completion(&conn->conn_post_wait_comp);
4398 spin_lock_bh(&conn->state_lock);
4399 }
4400 atomic_set(&conn->connection_reinstatement, 1);
4401 spin_unlock_bh(&conn->state_lock);
4402
4403 /*
4404 * If any other processes are accessing this connection pointer we
4405 * must wait until they have completed.
4406 */
4407 iscsit_check_conn_usage_count(conn);
4408
4409 ahash_request_free(conn->conn_tx_hash);
4410 if (conn->conn_rx_hash) {
4411 struct crypto_ahash *tfm;
4412
4413 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4414 ahash_request_free(conn->conn_rx_hash);
4415 crypto_free_ahash(tfm);
4416 }
4417
4418 if (conn->sock)
4419 sock_release(conn->sock);
4420
4421 if (conn->conn_transport->iscsit_free_conn)
4422 conn->conn_transport->iscsit_free_conn(conn);
4423
4424 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4425 conn->conn_state = TARG_CONN_STATE_FREE;
4426 iscsit_free_conn(conn);
4427
4428 spin_lock_bh(&sess->conn_lock);
4429 atomic_dec(&sess->nconn);
4430 pr_debug("Decremented iSCSI connection count to %d from node:"
4431 " %s\n", atomic_read(&sess->nconn),
4432 sess->sess_ops->InitiatorName);
4433 /*
4434 * Make sure that if one connection fails in an non ERL=2 iSCSI
4435 * Session that they all fail.
4436 */
4437 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4438 !atomic_read(&sess->session_logout))
4439 atomic_set(&sess->session_fall_back_to_erl0, 1);
4440
4441 /*
4442 * If this was not the last connection in the session, and we are
4443 * performing session reinstatement or falling back to ERL=0, call
4444 * iscsit_stop_session() without sleeping to shutdown the other
4445 * active connections.
4446 */
4447 if (atomic_read(&sess->nconn)) {
4448 if (!atomic_read(&sess->session_reinstatement) &&
4449 !atomic_read(&sess->session_fall_back_to_erl0)) {
4450 spin_unlock_bh(&sess->conn_lock);
4451 return 0;
4452 }
4453 if (!atomic_read(&sess->session_stop_active)) {
4454 atomic_set(&sess->session_stop_active, 1);
4455 spin_unlock_bh(&sess->conn_lock);
4456 iscsit_stop_session(sess, 0, 0);
4457 return 0;
4458 }
4459 spin_unlock_bh(&sess->conn_lock);
4460 return 0;
4461 }
4462
4463 /*
4464 * If this was the last connection in the session and one of the
4465 * following is occurring:
4466 *
4467 * Session Reinstatement is not being performed, and are falling back
4468 * to ERL=0 call iscsit_close_session().
4469 *
4470 * Session Logout was requested. iscsit_close_session() will be called
4471 * elsewhere.
4472 *
4473 * Session Continuation is not being performed, start the Time2Retain
4474 * handler and check if sleep_on_sess_wait_sem is active.
4475 */
4476 if (!atomic_read(&sess->session_reinstatement) &&
4477 atomic_read(&sess->session_fall_back_to_erl0)) {
4478 spin_unlock_bh(&sess->conn_lock);
4479 complete_all(&sess->session_wait_comp);
4480 iscsit_close_session(sess, true);
4481
4482 return 0;
4483 } else if (atomic_read(&sess->session_logout)) {
4484 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4485 sess->session_state = TARG_SESS_STATE_FREE;
4486
4487 if (atomic_read(&sess->session_close)) {
4488 spin_unlock_bh(&sess->conn_lock);
4489 complete_all(&sess->session_wait_comp);
4490 iscsit_close_session(sess, true);
4491 } else {
4492 spin_unlock_bh(&sess->conn_lock);
4493 }
4494
4495 return 0;
4496 } else {
4497 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4498 sess->session_state = TARG_SESS_STATE_FAILED;
4499
4500 if (!atomic_read(&sess->session_continuation))
4501 iscsit_start_time2retain_handler(sess);
4502
4503 if (atomic_read(&sess->session_close)) {
4504 spin_unlock_bh(&sess->conn_lock);
4505 complete_all(&sess->session_wait_comp);
4506 iscsit_close_session(sess, true);
4507 } else {
4508 spin_unlock_bh(&sess->conn_lock);
4509 }
4510
4511 return 0;
4512 }
4513 }
4514
4515 /*
4516 * If the iSCSI Session for the iSCSI Initiator Node exists,
4517 * forcefully shutdown the iSCSI NEXUS.
4518 */
iscsit_close_session(struct iscsit_session * sess,bool can_sleep)4519 int iscsit_close_session(struct iscsit_session *sess, bool can_sleep)
4520 {
4521 struct iscsi_portal_group *tpg = sess->tpg;
4522 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4523
4524 if (atomic_read(&sess->nconn)) {
4525 pr_err("%d connection(s) still exist for iSCSI session"
4526 " to %s\n", atomic_read(&sess->nconn),
4527 sess->sess_ops->InitiatorName);
4528 BUG();
4529 }
4530
4531 spin_lock_bh(&se_tpg->session_lock);
4532 atomic_set(&sess->session_logout, 1);
4533 atomic_set(&sess->session_reinstatement, 1);
4534 iscsit_stop_time2retain_timer(sess);
4535 spin_unlock_bh(&se_tpg->session_lock);
4536
4537 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4538 iscsit_free_connection_recovery_entries(sess);
4539
4540 /*
4541 * transport_deregister_session_configfs() will clear the
4542 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4543 * can be setting it again with __transport_register_session() in
4544 * iscsi_post_login_handler() again after the iscsit_stop_session()
4545 * completes in iscsi_np context.
4546 */
4547 transport_deregister_session_configfs(sess->se_sess);
4548
4549 /*
4550 * If any other processes are accessing this session pointer we must
4551 * wait until they have completed. If we are in an interrupt (the
4552 * time2retain handler) and contain and active session usage count we
4553 * restart the timer and exit.
4554 */
4555 if (iscsit_check_session_usage_count(sess, can_sleep)) {
4556 atomic_set(&sess->session_logout, 0);
4557 iscsit_start_time2retain_handler(sess);
4558 return 0;
4559 }
4560
4561 transport_deregister_session(sess->se_sess);
4562
4563 iscsit_free_all_ooo_cmdsns(sess);
4564
4565 spin_lock_bh(&se_tpg->session_lock);
4566 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4567 sess->session_state = TARG_SESS_STATE_FREE;
4568 pr_debug("Released iSCSI session from node: %s\n",
4569 sess->sess_ops->InitiatorName);
4570 tpg->nsessions--;
4571 if (tpg->tpg_tiqn)
4572 tpg->tpg_tiqn->tiqn_nsessions--;
4573
4574 pr_debug("Decremented number of active iSCSI Sessions on"
4575 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4576
4577 ida_free(&sess_ida, sess->session_index);
4578 kfree(sess->sess_ops);
4579 sess->sess_ops = NULL;
4580 spin_unlock_bh(&se_tpg->session_lock);
4581
4582 kfree(sess);
4583 return 0;
4584 }
4585
iscsit_logout_post_handler_closesession(struct iscsit_conn * conn)4586 static void iscsit_logout_post_handler_closesession(
4587 struct iscsit_conn *conn)
4588 {
4589 struct iscsit_session *sess = conn->sess;
4590 int sleep = 1;
4591 /*
4592 * Traditional iscsi/tcp will invoke this logic from TX thread
4593 * context during session logout, so clear tx_thread_active and
4594 * sleep if iscsit_close_connection() has not already occured.
4595 *
4596 * Since iser-target invokes this logic from it's own workqueue,
4597 * always sleep waiting for RX/TX thread shutdown to complete
4598 * within iscsit_close_connection().
4599 */
4600 if (!conn->conn_transport->rdma_shutdown) {
4601 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4602 if (!sleep)
4603 return;
4604 }
4605
4606 atomic_set(&conn->conn_logout_remove, 0);
4607 complete(&conn->conn_logout_comp);
4608
4609 iscsit_dec_conn_usage_count(conn);
4610 atomic_set(&sess->session_close, 1);
4611 iscsit_stop_session(sess, sleep, sleep);
4612 iscsit_dec_session_usage_count(sess);
4613 }
4614
iscsit_logout_post_handler_samecid(struct iscsit_conn * conn)4615 static void iscsit_logout_post_handler_samecid(
4616 struct iscsit_conn *conn)
4617 {
4618 int sleep = 1;
4619
4620 if (!conn->conn_transport->rdma_shutdown) {
4621 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4622 if (!sleep)
4623 return;
4624 }
4625
4626 atomic_set(&conn->conn_logout_remove, 0);
4627 complete(&conn->conn_logout_comp);
4628
4629 iscsit_cause_connection_reinstatement(conn, sleep);
4630 iscsit_dec_conn_usage_count(conn);
4631 }
4632
iscsit_logout_post_handler_diffcid(struct iscsit_conn * conn,u16 cid)4633 static void iscsit_logout_post_handler_diffcid(
4634 struct iscsit_conn *conn,
4635 u16 cid)
4636 {
4637 struct iscsit_conn *l_conn;
4638 struct iscsit_session *sess = conn->sess;
4639 bool conn_found = false;
4640
4641 if (!sess)
4642 return;
4643
4644 spin_lock_bh(&sess->conn_lock);
4645 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4646 if (l_conn->cid == cid) {
4647 iscsit_inc_conn_usage_count(l_conn);
4648 conn_found = true;
4649 break;
4650 }
4651 }
4652 spin_unlock_bh(&sess->conn_lock);
4653
4654 if (!conn_found)
4655 return;
4656
4657 if (l_conn->sock)
4658 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4659
4660 spin_lock_bh(&l_conn->state_lock);
4661 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4662 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4663 spin_unlock_bh(&l_conn->state_lock);
4664
4665 iscsit_cause_connection_reinstatement(l_conn, 1);
4666 iscsit_dec_conn_usage_count(l_conn);
4667 }
4668
4669 /*
4670 * Return of 0 causes the TX thread to restart.
4671 */
iscsit_logout_post_handler(struct iscsit_cmd * cmd,struct iscsit_conn * conn)4672 int iscsit_logout_post_handler(
4673 struct iscsit_cmd *cmd,
4674 struct iscsit_conn *conn)
4675 {
4676 int ret = 0;
4677
4678 switch (cmd->logout_reason) {
4679 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4680 switch (cmd->logout_response) {
4681 case ISCSI_LOGOUT_SUCCESS:
4682 case ISCSI_LOGOUT_CLEANUP_FAILED:
4683 default:
4684 iscsit_logout_post_handler_closesession(conn);
4685 break;
4686 }
4687 break;
4688 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4689 if (conn->cid == cmd->logout_cid) {
4690 switch (cmd->logout_response) {
4691 case ISCSI_LOGOUT_SUCCESS:
4692 case ISCSI_LOGOUT_CLEANUP_FAILED:
4693 default:
4694 iscsit_logout_post_handler_samecid(conn);
4695 break;
4696 }
4697 } else {
4698 switch (cmd->logout_response) {
4699 case ISCSI_LOGOUT_SUCCESS:
4700 iscsit_logout_post_handler_diffcid(conn,
4701 cmd->logout_cid);
4702 break;
4703 case ISCSI_LOGOUT_CID_NOT_FOUND:
4704 case ISCSI_LOGOUT_CLEANUP_FAILED:
4705 default:
4706 break;
4707 }
4708 ret = 1;
4709 }
4710 break;
4711 case ISCSI_LOGOUT_REASON_RECOVERY:
4712 switch (cmd->logout_response) {
4713 case ISCSI_LOGOUT_SUCCESS:
4714 case ISCSI_LOGOUT_CID_NOT_FOUND:
4715 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4716 case ISCSI_LOGOUT_CLEANUP_FAILED:
4717 default:
4718 break;
4719 }
4720 ret = 1;
4721 break;
4722 default:
4723 break;
4724
4725 }
4726 return ret;
4727 }
4728 EXPORT_SYMBOL(iscsit_logout_post_handler);
4729
iscsit_fail_session(struct iscsit_session * sess)4730 void iscsit_fail_session(struct iscsit_session *sess)
4731 {
4732 struct iscsit_conn *conn;
4733
4734 spin_lock_bh(&sess->conn_lock);
4735 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4736 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4737 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4738 }
4739 spin_unlock_bh(&sess->conn_lock);
4740
4741 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4742 sess->session_state = TARG_SESS_STATE_FAILED;
4743 }
4744
iscsit_stop_session(struct iscsit_session * sess,int session_sleep,int connection_sleep)4745 void iscsit_stop_session(
4746 struct iscsit_session *sess,
4747 int session_sleep,
4748 int connection_sleep)
4749 {
4750 u16 conn_count = atomic_read(&sess->nconn);
4751 struct iscsit_conn *conn, *conn_tmp = NULL;
4752 int is_last;
4753
4754 spin_lock_bh(&sess->conn_lock);
4755
4756 if (connection_sleep) {
4757 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4758 conn_list) {
4759 if (conn_count == 0)
4760 break;
4761
4762 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4763 is_last = 1;
4764 } else {
4765 iscsit_inc_conn_usage_count(conn_tmp);
4766 is_last = 0;
4767 }
4768 iscsit_inc_conn_usage_count(conn);
4769
4770 spin_unlock_bh(&sess->conn_lock);
4771 iscsit_cause_connection_reinstatement(conn, 1);
4772 spin_lock_bh(&sess->conn_lock);
4773
4774 iscsit_dec_conn_usage_count(conn);
4775 if (is_last == 0)
4776 iscsit_dec_conn_usage_count(conn_tmp);
4777 conn_count--;
4778 }
4779 } else {
4780 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4781 iscsit_cause_connection_reinstatement(conn, 0);
4782 }
4783
4784 if (session_sleep && atomic_read(&sess->nconn)) {
4785 spin_unlock_bh(&sess->conn_lock);
4786 wait_for_completion(&sess->session_wait_comp);
4787 } else
4788 spin_unlock_bh(&sess->conn_lock);
4789 }
4790
iscsit_release_sessions_for_tpg(struct iscsi_portal_group * tpg,int force)4791 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4792 {
4793 struct iscsit_session *sess;
4794 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4795 struct se_session *se_sess, *se_sess_tmp;
4796 LIST_HEAD(free_list);
4797 int session_count = 0;
4798
4799 spin_lock_bh(&se_tpg->session_lock);
4800 if (tpg->nsessions && !force) {
4801 spin_unlock_bh(&se_tpg->session_lock);
4802 return -1;
4803 }
4804
4805 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4806 sess_list) {
4807 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr;
4808
4809 spin_lock(&sess->conn_lock);
4810 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4811 atomic_read(&sess->session_logout) ||
4812 atomic_read(&sess->session_close) ||
4813 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4814 spin_unlock(&sess->conn_lock);
4815 continue;
4816 }
4817 iscsit_inc_session_usage_count(sess);
4818 atomic_set(&sess->session_reinstatement, 1);
4819 atomic_set(&sess->session_fall_back_to_erl0, 1);
4820 atomic_set(&sess->session_close, 1);
4821 spin_unlock(&sess->conn_lock);
4822
4823 list_move_tail(&se_sess->sess_list, &free_list);
4824 }
4825 spin_unlock_bh(&se_tpg->session_lock);
4826
4827 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4828 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr;
4829
4830 list_del_init(&se_sess->sess_list);
4831 iscsit_stop_session(sess, 1, 1);
4832 iscsit_dec_session_usage_count(sess);
4833 session_count++;
4834 }
4835
4836 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4837 " Group: %hu\n", session_count, tpg->tpgt);
4838 return 0;
4839 }
4840
4841 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4842 MODULE_VERSION("4.1.x");
4843 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4844 MODULE_LICENSE("GPL");
4845
4846 module_init(iscsi_target_init_module);
4847 module_exit(iscsi_target_cleanup_module);
4848