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 <linux/crc32c.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 <linux/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_obj(*tiqn);
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_obj(*np);
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 u32 iscsit_crc_buf(const void *buf, u32 payload_length,
494 u32 padding, const void *pad_bytes);
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 *header_digest = iscsit_crc_buf(hdr, ISCSI_HDR_LEN, 0, NULL);
514
515 iov[0].iov_len += ISCSI_CRC_LEN;
516 tx_size += ISCSI_CRC_LEN;
517 pr_debug("Attaching CRC32C HeaderDigest"
518 " to opcode 0x%x 0x%08x\n",
519 hdr->opcode, *header_digest);
520 }
521
522 if (data_buf_len) {
523 u32 padding = ((-data_buf_len) & 3);
524
525 iov[niov].iov_base = (void *)data_buf;
526 iov[niov++].iov_len = data_buf_len;
527 tx_size += data_buf_len;
528
529 if (padding != 0) {
530 iov[niov].iov_base = &cmd->pad_bytes;
531 iov[niov++].iov_len = padding;
532 tx_size += padding;
533 pr_debug("Attaching %u additional"
534 " padding bytes.\n", padding);
535 }
536
537 if (conn->conn_ops->DataDigest) {
538 cmd->data_crc = iscsit_crc_buf(data_buf, data_buf_len,
539 padding,
540 &cmd->pad_bytes);
541 iov[niov].iov_base = &cmd->data_crc;
542 iov[niov++].iov_len = ISCSI_CRC_LEN;
543 tx_size += ISCSI_CRC_LEN;
544 pr_debug("Attached DataDigest for %u"
545 " bytes opcode 0x%x, CRC 0x%08x\n",
546 data_buf_len, hdr->opcode, cmd->data_crc);
547 }
548 }
549
550 cmd->iov_misc_count = niov;
551 cmd->tx_size = tx_size;
552
553 ret = iscsit_send_tx_data(cmd, conn, 1);
554 if (ret < 0) {
555 iscsit_tx_thread_wait_for_tcp(conn);
556 return ret;
557 }
558
559 return 0;
560 }
561
562 static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec,
563 u32 data_offset, u32 data_length);
564 static void iscsit_unmap_iovec(struct iscsit_cmd *);
565 static u32 iscsit_crc_sglist(const struct iscsit_cmd *cmd, u32 data_length,
566 u32 padding, const u8 *pad_bytes);
567 static int
iscsit_xmit_datain_pdu(struct iscsit_conn * conn,struct iscsit_cmd * cmd,const struct iscsi_datain * datain)568 iscsit_xmit_datain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
569 const struct iscsi_datain *datain)
570 {
571 struct kvec *iov;
572 u32 iov_count = 0, tx_size = 0;
573 int ret, iov_ret;
574
575 iov = &cmd->iov_data[0];
576 iov[iov_count].iov_base = cmd->pdu;
577 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
578 tx_size += ISCSI_HDR_LEN;
579
580 if (conn->conn_ops->HeaderDigest) {
581 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
582
583 *header_digest = iscsit_crc_buf(cmd->pdu, ISCSI_HDR_LEN, 0,
584 NULL);
585 iov[0].iov_len += ISCSI_CRC_LEN;
586 tx_size += ISCSI_CRC_LEN;
587
588 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
589 *header_digest);
590 }
591
592 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[iov_count],
593 cmd->orig_iov_data_count - (iov_count + 2),
594 datain->offset, datain->length);
595 if (iov_ret < 0)
596 return -1;
597
598 iov_count += iov_ret;
599 tx_size += datain->length;
600
601 cmd->padding = ((-datain->length) & 3);
602 if (cmd->padding) {
603 iov[iov_count].iov_base = cmd->pad_bytes;
604 iov[iov_count++].iov_len = cmd->padding;
605 tx_size += cmd->padding;
606
607 pr_debug("Attaching %u padding bytes\n", cmd->padding);
608 }
609
610 if (conn->conn_ops->DataDigest) {
611 cmd->data_crc = iscsit_crc_sglist(cmd, datain->length,
612 cmd->padding, cmd->pad_bytes);
613 iov[iov_count].iov_base = &cmd->data_crc;
614 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
615 tx_size += ISCSI_CRC_LEN;
616
617 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
618 datain->length + cmd->padding, cmd->data_crc);
619 }
620
621 cmd->iov_data_count = iov_count;
622 cmd->tx_size = tx_size;
623
624 ret = iscsit_fe_sendpage_sg(cmd, conn);
625
626 iscsit_unmap_iovec(cmd);
627
628 if (ret < 0) {
629 iscsit_tx_thread_wait_for_tcp(conn);
630 return ret;
631 }
632
633 return 0;
634 }
635
iscsit_xmit_pdu(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_datain_req * dr,const void * buf,u32 buf_len)636 static int iscsit_xmit_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
637 struct iscsi_datain_req *dr, const void *buf,
638 u32 buf_len)
639 {
640 if (dr)
641 return iscsit_xmit_datain_pdu(conn, cmd, buf);
642 else
643 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
644 }
645
iscsit_get_sup_prot_ops(struct iscsit_conn * conn)646 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsit_conn *conn)
647 {
648 return TARGET_PROT_NORMAL;
649 }
650
651 static struct iscsit_transport iscsi_target_transport = {
652 .name = "iSCSI/TCP",
653 .transport_type = ISCSI_TCP,
654 .rdma_shutdown = false,
655 .owner = NULL,
656 .iscsit_setup_np = iscsit_setup_np,
657 .iscsit_accept_np = iscsit_accept_np,
658 .iscsit_free_np = iscsit_free_np,
659 .iscsit_get_login_rx = iscsit_get_login_rx,
660 .iscsit_put_login_tx = iscsit_put_login_tx,
661 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
662 .iscsit_immediate_queue = iscsit_immediate_queue,
663 .iscsit_response_queue = iscsit_response_queue,
664 .iscsit_queue_data_in = iscsit_queue_rsp,
665 .iscsit_queue_status = iscsit_queue_rsp,
666 .iscsit_aborted_task = iscsit_aborted_task,
667 .iscsit_xmit_pdu = iscsit_xmit_pdu,
668 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
669 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
670 };
671
iscsi_target_init_module(void)672 static int __init iscsi_target_init_module(void)
673 {
674 int ret = 0, size;
675
676 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
677 iscsit_global = kzalloc_obj(*iscsit_global);
678 if (!iscsit_global)
679 return -1;
680
681 spin_lock_init(&iscsit_global->ts_bitmap_lock);
682 mutex_init(&auth_id_lock);
683 idr_init(&tiqn_idr);
684
685 ret = target_register_template(&iscsi_ops);
686 if (ret)
687 goto out;
688
689 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
690 iscsit_global->ts_bitmap = vzalloc(size);
691 if (!iscsit_global->ts_bitmap)
692 goto configfs_out;
693
694 if (!zalloc_cpumask_var(&iscsit_global->allowed_cpumask, GFP_KERNEL)) {
695 pr_err("Unable to allocate iscsit_global->allowed_cpumask\n");
696 goto bitmap_out;
697 }
698 cpumask_setall(iscsit_global->allowed_cpumask);
699
700 lio_qr_cache = kmem_cache_create("lio_qr_cache",
701 sizeof(struct iscsi_queue_req),
702 __alignof__(struct iscsi_queue_req), 0, NULL);
703 if (!lio_qr_cache) {
704 pr_err("Unable to kmem_cache_create() for"
705 " lio_qr_cache\n");
706 goto cpumask_out;
707 }
708
709 lio_dr_cache = kmem_cache_create("lio_dr_cache",
710 sizeof(struct iscsi_datain_req),
711 __alignof__(struct iscsi_datain_req), 0, NULL);
712 if (!lio_dr_cache) {
713 pr_err("Unable to kmem_cache_create() for"
714 " lio_dr_cache\n");
715 goto qr_out;
716 }
717
718 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
719 sizeof(struct iscsi_ooo_cmdsn),
720 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
721 if (!lio_ooo_cache) {
722 pr_err("Unable to kmem_cache_create() for"
723 " lio_ooo_cache\n");
724 goto dr_out;
725 }
726
727 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
728 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
729 0, NULL);
730 if (!lio_r2t_cache) {
731 pr_err("Unable to kmem_cache_create() for"
732 " lio_r2t_cache\n");
733 goto ooo_out;
734 }
735
736 iscsit_register_transport(&iscsi_target_transport);
737
738 if (iscsit_load_discovery_tpg() < 0)
739 goto r2t_out;
740
741 return ret;
742 r2t_out:
743 iscsit_unregister_transport(&iscsi_target_transport);
744 kmem_cache_destroy(lio_r2t_cache);
745 ooo_out:
746 kmem_cache_destroy(lio_ooo_cache);
747 dr_out:
748 kmem_cache_destroy(lio_dr_cache);
749 qr_out:
750 kmem_cache_destroy(lio_qr_cache);
751 cpumask_out:
752 free_cpumask_var(iscsit_global->allowed_cpumask);
753 bitmap_out:
754 vfree(iscsit_global->ts_bitmap);
755 configfs_out:
756 /* XXX: this probably wants it to be it's own unwind step.. */
757 if (iscsit_global->discovery_tpg)
758 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
759 target_unregister_template(&iscsi_ops);
760 out:
761 kfree(iscsit_global);
762 return -ENOMEM;
763 }
764
iscsi_target_cleanup_module(void)765 static void __exit iscsi_target_cleanup_module(void)
766 {
767 iscsit_release_discovery_tpg();
768 iscsit_unregister_transport(&iscsi_target_transport);
769 kmem_cache_destroy(lio_qr_cache);
770 kmem_cache_destroy(lio_dr_cache);
771 kmem_cache_destroy(lio_ooo_cache);
772 kmem_cache_destroy(lio_r2t_cache);
773
774 /*
775 * Shutdown discovery sessions and disable discovery TPG
776 */
777 if (iscsit_global->discovery_tpg)
778 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
779
780 target_unregister_template(&iscsi_ops);
781
782 free_cpumask_var(iscsit_global->allowed_cpumask);
783 vfree(iscsit_global->ts_bitmap);
784 kfree(iscsit_global);
785 }
786
iscsit_add_reject(struct iscsit_conn * conn,u8 reason,unsigned char * buf)787 int iscsit_add_reject(
788 struct iscsit_conn *conn,
789 u8 reason,
790 unsigned char *buf)
791 {
792 struct iscsit_cmd *cmd;
793
794 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
795 if (!cmd)
796 return -1;
797
798 cmd->iscsi_opcode = ISCSI_OP_REJECT;
799 cmd->reject_reason = reason;
800
801 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
802 if (!cmd->buf_ptr) {
803 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
804 iscsit_free_cmd(cmd, false);
805 return -1;
806 }
807
808 spin_lock_bh(&conn->cmd_lock);
809 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
810 spin_unlock_bh(&conn->cmd_lock);
811
812 cmd->i_state = ISTATE_SEND_REJECT;
813 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
814
815 return -1;
816 }
817 EXPORT_SYMBOL(iscsit_add_reject);
818
iscsit_add_reject_from_cmd(struct iscsit_cmd * cmd,u8 reason,bool add_to_conn,unsigned char * buf)819 static int iscsit_add_reject_from_cmd(
820 struct iscsit_cmd *cmd,
821 u8 reason,
822 bool add_to_conn,
823 unsigned char *buf)
824 {
825 struct iscsit_conn *conn;
826 const bool do_put = cmd->se_cmd.se_tfo != NULL;
827
828 if (!cmd->conn) {
829 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
830 cmd->init_task_tag);
831 return -1;
832 }
833 conn = cmd->conn;
834
835 cmd->iscsi_opcode = ISCSI_OP_REJECT;
836 cmd->reject_reason = reason;
837
838 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
839 if (!cmd->buf_ptr) {
840 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
841 iscsit_free_cmd(cmd, false);
842 return -1;
843 }
844
845 if (add_to_conn) {
846 spin_lock_bh(&conn->cmd_lock);
847 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
848 spin_unlock_bh(&conn->cmd_lock);
849 }
850
851 cmd->i_state = ISTATE_SEND_REJECT;
852 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
853 /*
854 * Perform the kref_put now if se_cmd has already been setup by
855 * scsit_setup_scsi_cmd()
856 */
857 if (do_put) {
858 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
859 target_put_sess_cmd(&cmd->se_cmd);
860 }
861 return -1;
862 }
863
iscsit_add_reject_cmd(struct iscsit_cmd * cmd,u8 reason,unsigned char * buf)864 static int iscsit_add_reject_cmd(struct iscsit_cmd *cmd, u8 reason,
865 unsigned char *buf)
866 {
867 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
868 }
869
iscsit_reject_cmd(struct iscsit_cmd * cmd,u8 reason,unsigned char * buf)870 int iscsit_reject_cmd(struct iscsit_cmd *cmd, u8 reason, unsigned char *buf)
871 {
872 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
873 }
874 EXPORT_SYMBOL(iscsit_reject_cmd);
875
876 /*
877 * Map some portion of the allocated scatterlist to an iovec, suitable for
878 * kernel sockets to copy data in/out.
879 */
iscsit_map_iovec(struct iscsit_cmd * cmd,struct kvec * iov,int nvec,u32 data_offset,u32 data_length)880 static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec,
881 u32 data_offset, u32 data_length)
882 {
883 u32 i = 0, orig_data_length = data_length;
884 struct scatterlist *sg;
885 unsigned int page_off;
886
887 /*
888 * We know each entry in t_data_sg contains a page.
889 */
890 u32 ent = data_offset / PAGE_SIZE;
891
892 if (!data_length)
893 return 0;
894
895 if (ent >= cmd->se_cmd.t_data_nents) {
896 pr_err("Initial page entry out-of-bounds\n");
897 goto overflow;
898 }
899
900 sg = &cmd->se_cmd.t_data_sg[ent];
901 page_off = (data_offset % PAGE_SIZE);
902
903 cmd->first_data_sg = sg;
904 cmd->first_data_sg_off = page_off;
905
906 while (data_length) {
907 u32 cur_len;
908
909 if (WARN_ON_ONCE(!sg || i >= nvec))
910 goto overflow;
911
912 cur_len = min_t(u32, data_length, sg->length - page_off);
913
914 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
915 iov[i].iov_len = cur_len;
916
917 data_length -= cur_len;
918 page_off = 0;
919 sg = sg_next(sg);
920 i++;
921 }
922
923 cmd->kmapped_nents = i;
924
925 return i;
926
927 overflow:
928 pr_err("offset %d + length %d overflow; %d/%d; sg-list:\n",
929 data_offset, orig_data_length, i, nvec);
930 for_each_sg(cmd->se_cmd.t_data_sg, sg,
931 cmd->se_cmd.t_data_nents, i) {
932 pr_err("[%d] off %d len %d\n",
933 i, sg->offset, sg->length);
934 }
935 return -1;
936 }
937
iscsit_unmap_iovec(struct iscsit_cmd * cmd)938 static void iscsit_unmap_iovec(struct iscsit_cmd *cmd)
939 {
940 u32 i;
941 struct scatterlist *sg;
942
943 sg = cmd->first_data_sg;
944
945 for (i = 0; i < cmd->kmapped_nents; i++)
946 kunmap(sg_page(&sg[i]));
947 }
948
iscsit_ack_from_expstatsn(struct iscsit_conn * conn,u32 exp_statsn)949 static void iscsit_ack_from_expstatsn(struct iscsit_conn *conn, u32 exp_statsn)
950 {
951 LIST_HEAD(ack_list);
952 struct iscsit_cmd *cmd, *cmd_p;
953
954 conn->exp_statsn = exp_statsn;
955
956 if (conn->sess->sess_ops->RDMAExtensions)
957 return;
958
959 spin_lock_bh(&conn->cmd_lock);
960 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
961 spin_lock(&cmd->istate_lock);
962 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
963 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
964 cmd->i_state = ISTATE_REMOVE;
965 spin_unlock(&cmd->istate_lock);
966 list_move_tail(&cmd->i_conn_node, &ack_list);
967 continue;
968 }
969 spin_unlock(&cmd->istate_lock);
970 }
971 spin_unlock_bh(&conn->cmd_lock);
972
973 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
974 list_del_init(&cmd->i_conn_node);
975 iscsit_free_cmd(cmd, false);
976 }
977 }
978
iscsit_allocate_iovecs(struct iscsit_cmd * cmd)979 static int iscsit_allocate_iovecs(struct iscsit_cmd *cmd)
980 {
981 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
982
983 iov_count += ISCSI_IOV_DATA_BUFFER;
984 cmd->iov_data = kzalloc_objs(*cmd->iov_data, iov_count);
985 if (!cmd->iov_data)
986 return -ENOMEM;
987
988 cmd->orig_iov_data_count = iov_count;
989 return 0;
990 }
991
iscsit_setup_scsi_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)992 int iscsit_setup_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
993 unsigned char *buf)
994 {
995 int data_direction, payload_length;
996 struct iscsi_ecdb_ahdr *ecdb_ahdr;
997 struct iscsi_scsi_req *hdr;
998 u16 ahslength, cdb_length;
999 int iscsi_task_attr;
1000 unsigned char *cdb;
1001 int sam_task_attr;
1002
1003 atomic_long_inc(&conn->sess->cmd_pdus);
1004
1005 hdr = (struct iscsi_scsi_req *) buf;
1006 payload_length = ntoh24(hdr->dlength);
1007
1008 /* FIXME; Add checks for AdditionalHeaderSegment */
1009
1010 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1011 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1012 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1013 " not set. Bad iSCSI Initiator.\n");
1014 return iscsit_add_reject_cmd(cmd,
1015 ISCSI_REASON_BOOKMARK_INVALID, buf);
1016 }
1017
1018 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1019 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1020 /*
1021 * From RFC-3720 Section 10.3.1:
1022 *
1023 * "Either or both of R and W MAY be 1 when either the
1024 * Expected Data Transfer Length and/or Bidirectional Read
1025 * Expected Data Transfer Length are 0"
1026 *
1027 * For this case, go ahead and clear the unnecssary bits
1028 * to avoid any confusion with ->data_direction.
1029 */
1030 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1031 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1032
1033 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1034 " set when Expected Data Transfer Length is 0 for"
1035 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1036 }
1037
1038 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1039 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1040 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1041 " MUST be set if Expected Data Transfer Length is not 0."
1042 " Bad iSCSI Initiator\n");
1043 return iscsit_add_reject_cmd(cmd,
1044 ISCSI_REASON_BOOKMARK_INVALID, buf);
1045 }
1046
1047 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1048 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1049 pr_err("Bidirectional operations not supported!\n");
1050 return iscsit_add_reject_cmd(cmd,
1051 ISCSI_REASON_BOOKMARK_INVALID, buf);
1052 }
1053
1054 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1055 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1056 " Scsi Command PDU.\n");
1057 return iscsit_add_reject_cmd(cmd,
1058 ISCSI_REASON_BOOKMARK_INVALID, buf);
1059 }
1060
1061 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1062 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1063 " protocol error.\n", payload_length);
1064 return iscsit_add_reject_cmd(cmd,
1065 ISCSI_REASON_PROTOCOL_ERROR, buf);
1066 }
1067
1068 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1069 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1070 pr_err("Expected Data Transfer Length and Length of"
1071 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1072 " bit is not set protocol error\n");
1073 return iscsit_add_reject_cmd(cmd,
1074 ISCSI_REASON_PROTOCOL_ERROR, buf);
1075 }
1076
1077 if (payload_length > be32_to_cpu(hdr->data_length)) {
1078 pr_err("DataSegmentLength: %u is greater than"
1079 " EDTL: %u, protocol error.\n", payload_length,
1080 hdr->data_length);
1081 return iscsit_add_reject_cmd(cmd,
1082 ISCSI_REASON_PROTOCOL_ERROR, buf);
1083 }
1084
1085 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1086 pr_err("DataSegmentLength: %u is greater than"
1087 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1088 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1089 return iscsit_add_reject_cmd(cmd,
1090 ISCSI_REASON_PROTOCOL_ERROR, buf);
1091 }
1092
1093 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1094 pr_err("DataSegmentLength: %u is greater than"
1095 " FirstBurstLength: %u, protocol error.\n",
1096 payload_length, conn->sess->sess_ops->FirstBurstLength);
1097 return iscsit_add_reject_cmd(cmd,
1098 ISCSI_REASON_BOOKMARK_INVALID, buf);
1099 }
1100
1101 cdb = hdr->cdb;
1102
1103 if (hdr->hlength) {
1104 ecdb_ahdr = (struct iscsi_ecdb_ahdr *) (hdr + 1);
1105 if (ecdb_ahdr->ahstype != ISCSI_AHSTYPE_CDB) {
1106 pr_err("Additional Header Segment type %d not supported!\n",
1107 ecdb_ahdr->ahstype);
1108 return iscsit_add_reject_cmd(cmd,
1109 ISCSI_REASON_CMD_NOT_SUPPORTED, buf);
1110 }
1111
1112 ahslength = be16_to_cpu(ecdb_ahdr->ahslength);
1113 if (!ahslength) {
1114 pr_err("Extended CDB AHS with zero length, protocol error.\n");
1115 return iscsit_add_reject_cmd(cmd,
1116 ISCSI_REASON_PROTOCOL_ERROR, buf);
1117 }
1118 if (ahslength > (hdr->hlength * 4) - 3) {
1119 pr_err("Extended CDB AHS length %u exceeds available PDU buffer.\n",
1120 ahslength);
1121 return iscsit_add_reject_cmd(cmd,
1122 ISCSI_REASON_PROTOCOL_ERROR, buf);
1123 }
1124
1125 cdb_length = ahslength - 1 + ISCSI_CDB_SIZE;
1126
1127 cdb = kmalloc(cdb_length, GFP_KERNEL);
1128 if (cdb == NULL)
1129 return iscsit_add_reject_cmd(cmd,
1130 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1131 memcpy(cdb, hdr->cdb, ISCSI_CDB_SIZE);
1132 memcpy(cdb + ISCSI_CDB_SIZE, ecdb_ahdr->ecdb, cdb_length - ISCSI_CDB_SIZE);
1133 }
1134
1135 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1136 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1137 DMA_NONE;
1138
1139 cmd->data_direction = data_direction;
1140 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1141 /*
1142 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1143 */
1144 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1145 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1146 sam_task_attr = TCM_SIMPLE_TAG;
1147 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1148 sam_task_attr = TCM_ORDERED_TAG;
1149 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1150 sam_task_attr = TCM_HEAD_TAG;
1151 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1152 sam_task_attr = TCM_ACA_TAG;
1153 else {
1154 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1155 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1156 sam_task_attr = TCM_SIMPLE_TAG;
1157 }
1158
1159 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1160 cmd->i_state = ISTATE_NEW_CMD;
1161 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1162 cmd->immediate_data = (payload_length) ? 1 : 0;
1163 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1164 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1165 if (cmd->unsolicited_data)
1166 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1167
1168 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1169 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1170 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1171 else
1172 cmd->targ_xfer_tag = 0xFFFFFFFF;
1173 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1174 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1175 cmd->first_burst_len = payload_length;
1176
1177 if (!conn->sess->sess_ops->RDMAExtensions &&
1178 cmd->data_direction == DMA_FROM_DEVICE) {
1179 struct iscsi_datain_req *dr;
1180
1181 dr = iscsit_allocate_datain_req();
1182 if (!dr) {
1183 if (cdb != hdr->cdb)
1184 kfree(cdb);
1185 return iscsit_add_reject_cmd(cmd,
1186 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1187 }
1188
1189 iscsit_attach_datain_req(cmd, dr);
1190 }
1191
1192 /*
1193 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1194 */
1195 __target_init_cmd(&cmd->se_cmd, &iscsi_ops,
1196 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1197 cmd->data_direction, sam_task_attr,
1198 cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun),
1199 conn->cmd_cnt);
1200
1201 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1202 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1203 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1204 conn->cid);
1205
1206 target_get_sess_cmd(&cmd->se_cmd, true);
1207
1208 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1209 cmd->sense_reason = target_cmd_init_cdb(&cmd->se_cmd, cdb,
1210 GFP_KERNEL);
1211
1212 if (cdb != hdr->cdb)
1213 kfree(cdb);
1214
1215 if (cmd->sense_reason) {
1216 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1217 return iscsit_add_reject_cmd(cmd,
1218 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1219 }
1220
1221 goto attach_cmd;
1222 }
1223
1224 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd);
1225 if (cmd->sense_reason)
1226 goto attach_cmd;
1227
1228 cmd->sense_reason = target_cmd_parse_cdb(&cmd->se_cmd);
1229 if (cmd->sense_reason)
1230 goto attach_cmd;
1231
1232 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1233 return iscsit_add_reject_cmd(cmd,
1234 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1235 }
1236
1237 attach_cmd:
1238 spin_lock_bh(&conn->cmd_lock);
1239 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1240 spin_unlock_bh(&conn->cmd_lock);
1241 return 0;
1242 }
1243 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1244
iscsit_set_unsolicited_dataout(struct iscsit_cmd * cmd)1245 void iscsit_set_unsolicited_dataout(struct iscsit_cmd *cmd)
1246 {
1247 iscsit_set_dataout_sequence_values(cmd);
1248
1249 spin_lock_bh(&cmd->dataout_timeout_lock);
1250 iscsit_start_dataout_timer(cmd, cmd->conn);
1251 spin_unlock_bh(&cmd->dataout_timeout_lock);
1252 }
1253 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout);
1254
iscsit_process_scsi_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_scsi_req * hdr)1255 int iscsit_process_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1256 struct iscsi_scsi_req *hdr)
1257 {
1258 int cmdsn_ret = 0;
1259 /*
1260 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1261 * the Immediate Bit is not set, and no Immediate
1262 * Data is attached.
1263 *
1264 * A PDU/CmdSN carrying Immediate Data can only
1265 * be processed after the DataCRC has passed.
1266 * If the DataCRC fails, the CmdSN MUST NOT
1267 * be acknowledged. (See below)
1268 */
1269 if (!cmd->immediate_data) {
1270 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1271 (unsigned char *)hdr, hdr->cmdsn);
1272 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1273 return -1;
1274 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1275 target_put_sess_cmd(&cmd->se_cmd);
1276 return 0;
1277 }
1278 }
1279
1280 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1281
1282 /*
1283 * If no Immediate Data is attached, it's OK to return now.
1284 */
1285 if (!cmd->immediate_data) {
1286 if (!cmd->sense_reason && cmd->unsolicited_data)
1287 iscsit_set_unsolicited_dataout(cmd);
1288 if (!cmd->sense_reason)
1289 return 0;
1290
1291 target_put_sess_cmd(&cmd->se_cmd);
1292 return 0;
1293 }
1294
1295 /*
1296 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1297 * execution. These exceptions are processed in CmdSN order using
1298 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1299 */
1300 if (cmd->sense_reason)
1301 return 1;
1302 /*
1303 * Call directly into transport_generic_new_cmd() to perform
1304 * the backend memory allocation.
1305 */
1306 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1307 if (cmd->sense_reason)
1308 return 1;
1309
1310 return 0;
1311 }
1312 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1313
1314 static int
iscsit_get_immediate_data(struct iscsit_cmd * cmd,struct iscsi_scsi_req * hdr,bool dump_payload)1315 iscsit_get_immediate_data(struct iscsit_cmd *cmd, struct iscsi_scsi_req *hdr,
1316 bool dump_payload)
1317 {
1318 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1319 int rc;
1320
1321 /*
1322 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1323 */
1324 if (dump_payload) {
1325 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done,
1326 cmd->first_burst_len);
1327
1328 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n",
1329 cmd->se_cmd.data_length, cmd->write_data_done,
1330 cmd->first_burst_len, length);
1331 rc = iscsit_dump_data_payload(cmd->conn, length, 1);
1332 pr_debug("Finished dumping immediate data\n");
1333 if (rc < 0)
1334 immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER;
1335 } else {
1336 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1337 cmd->first_burst_len);
1338 }
1339
1340 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1341 /*
1342 * A PDU/CmdSN carrying Immediate Data passed
1343 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1344 * Immediate Bit is not set.
1345 */
1346 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1347 (unsigned char *)hdr, hdr->cmdsn);
1348 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1349 return -1;
1350
1351 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1352 target_put_sess_cmd(&cmd->se_cmd);
1353
1354 return 0;
1355 } else if (cmd->unsolicited_data)
1356 iscsit_set_unsolicited_dataout(cmd);
1357
1358 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1359 /*
1360 * Immediate Data failed DataCRC and ERL>=1,
1361 * silently drop this PDU and let the initiator
1362 * plug the CmdSN gap.
1363 *
1364 * FIXME: Send Unsolicited NOPIN with reserved
1365 * TTT here to help the initiator figure out
1366 * the missing CmdSN, although they should be
1367 * intelligent enough to determine the missing
1368 * CmdSN and issue a retry to plug the sequence.
1369 */
1370 cmd->i_state = ISTATE_REMOVE;
1371 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1372 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1373 return -1;
1374
1375 return 0;
1376 }
1377
1378 static int
iscsit_handle_scsi_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)1379 iscsit_handle_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1380 unsigned char *buf)
1381 {
1382 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1383 int rc, immed_data;
1384 bool dump_payload = false;
1385
1386 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1387 if (rc < 0)
1388 return 0;
1389 /*
1390 * Allocation iovecs needed for struct socket operations for
1391 * traditional iSCSI block I/O.
1392 */
1393 if (iscsit_allocate_iovecs(cmd) < 0) {
1394 return iscsit_reject_cmd(cmd,
1395 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1396 }
1397 immed_data = cmd->immediate_data;
1398
1399 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1400 if (rc < 0)
1401 return rc;
1402 else if (rc > 0)
1403 dump_payload = true;
1404
1405 if (!immed_data)
1406 return 0;
1407
1408 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1409 }
1410
iscsit_crc_sglist(const struct iscsit_cmd * cmd,u32 data_length,u32 padding,const u8 * pad_bytes)1411 static u32 iscsit_crc_sglist(const struct iscsit_cmd *cmd, u32 data_length,
1412 u32 padding, const u8 *pad_bytes)
1413 {
1414 struct scatterlist *sg = cmd->first_data_sg;
1415 unsigned int page_off = cmd->first_data_sg_off;
1416 u32 crc = ~0;
1417
1418 while (data_length) {
1419 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
1420 const void *virt;
1421
1422 virt = kmap_local_page(sg_page(sg)) + sg->offset + page_off;
1423 crc = crc32c(crc, virt, cur_len);
1424 kunmap_local(virt);
1425
1426 /* iscsit_map_iovec has already checked for invalid sg pointers */
1427 sg = sg_next(sg);
1428
1429 page_off = 0;
1430 data_length -= cur_len;
1431 }
1432
1433 if (padding)
1434 crc = crc32c(crc, pad_bytes, padding);
1435
1436 return ~crc;
1437 }
1438
iscsit_crc_buf(const void * buf,u32 payload_length,u32 padding,const void * pad_bytes)1439 static u32 iscsit_crc_buf(const void *buf, u32 payload_length,
1440 u32 padding, const void *pad_bytes)
1441 {
1442 u32 crc = ~0;
1443
1444 crc = crc32c(crc, buf, payload_length);
1445
1446 if (padding)
1447 crc = crc32c(crc, pad_bytes, padding);
1448
1449 return ~crc;
1450 }
1451
1452 int
__iscsit_check_dataout_hdr(struct iscsit_conn * conn,void * buf,struct iscsit_cmd * cmd,u32 payload_length,bool * success)1453 __iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf,
1454 struct iscsit_cmd *cmd, u32 payload_length,
1455 bool *success)
1456 {
1457 struct iscsi_data *hdr = buf;
1458 struct se_cmd *se_cmd;
1459 int rc;
1460
1461 /* iSCSI write */
1462 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1463
1464 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1465 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1466 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1467 payload_length, conn->cid);
1468
1469 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1470 pr_err("Command ITT: 0x%08x received DataOUT after"
1471 " last DataOUT received, dumping payload\n",
1472 cmd->init_task_tag);
1473 return iscsit_dump_data_payload(conn, payload_length, 1);
1474 }
1475
1476 if (cmd->data_direction != DMA_TO_DEVICE) {
1477 pr_err("Command ITT: 0x%08x received DataOUT for a"
1478 " NON-WRITE command.\n", cmd->init_task_tag);
1479 return iscsit_dump_data_payload(conn, payload_length, 1);
1480 }
1481 se_cmd = &cmd->se_cmd;
1482 iscsit_mod_dataout_timer(cmd);
1483
1484 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1485 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1486 be32_to_cpu(hdr->offset), payload_length,
1487 cmd->se_cmd.data_length);
1488 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1489 }
1490
1491 if (cmd->unsolicited_data) {
1492 int dump_unsolicited_data = 0;
1493
1494 if (conn->sess->sess_ops->InitialR2T) {
1495 pr_err("Received unexpected unsolicited data"
1496 " while InitialR2T=Yes, protocol error.\n");
1497 transport_send_check_condition_and_sense(&cmd->se_cmd,
1498 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1499 return -1;
1500 }
1501 /*
1502 * Special case for dealing with Unsolicited DataOUT
1503 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1504 * failures;
1505 */
1506
1507 /* Something's amiss if we're not in WRITE_PENDING state... */
1508 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1509 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1510 dump_unsolicited_data = 1;
1511
1512 if (dump_unsolicited_data) {
1513 /*
1514 * Check if a delayed TASK_ABORTED status needs to
1515 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1516 * received with the unsolicited data out.
1517 */
1518 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1519 iscsit_stop_dataout_timer(cmd);
1520
1521 return iscsit_dump_data_payload(conn, payload_length, 1);
1522 }
1523 } else {
1524 /*
1525 * For the normal solicited data path:
1526 *
1527 * Check for a delayed TASK_ABORTED status and dump any
1528 * incoming data out payload if one exists. Also, when the
1529 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1530 * data out sequence, we decrement outstanding_r2ts. Once
1531 * outstanding_r2ts reaches zero, go ahead and send the delayed
1532 * TASK_ABORTED status.
1533 */
1534 if (se_cmd->transport_state & CMD_T_ABORTED) {
1535 if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1536 --cmd->outstanding_r2ts < 1)
1537 iscsit_stop_dataout_timer(cmd);
1538
1539 return iscsit_dump_data_payload(conn, payload_length, 1);
1540 }
1541 }
1542 /*
1543 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1544 * within-command recovery checks before receiving the payload.
1545 */
1546 rc = iscsit_check_pre_dataout(cmd, buf);
1547 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1548 return 0;
1549 else if (rc == DATAOUT_CANNOT_RECOVER)
1550 return -1;
1551 *success = true;
1552 return 0;
1553 }
1554 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1555
1556 int
iscsit_check_dataout_hdr(struct iscsit_conn * conn,void * buf,struct iscsit_cmd ** out_cmd)1557 iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf,
1558 struct iscsit_cmd **out_cmd)
1559 {
1560 struct iscsi_data *hdr = buf;
1561 struct iscsit_cmd *cmd;
1562 u32 payload_length = ntoh24(hdr->dlength);
1563 int rc;
1564 bool success = false;
1565
1566 if (!payload_length) {
1567 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1568 return 0;
1569 }
1570
1571 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1572 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1573 " MaxXmitDataSegmentLength: %u\n", payload_length,
1574 conn->conn_ops->MaxXmitDataSegmentLength);
1575 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1576 }
1577
1578 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1579 if (!cmd)
1580 return 0;
1581
1582 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1583
1584 if (success)
1585 *out_cmd = cmd;
1586
1587 return rc;
1588 }
1589 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1590
1591 static int
iscsit_get_dataout(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_data * hdr)1592 iscsit_get_dataout(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1593 struct iscsi_data *hdr)
1594 {
1595 struct kvec *iov;
1596 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1597 u32 payload_length;
1598 int iov_ret, data_crc_failed = 0;
1599
1600 payload_length = min_t(u32, cmd->se_cmd.data_length,
1601 ntoh24(hdr->dlength));
1602 rx_size += payload_length;
1603 iov = &cmd->iov_data[0];
1604
1605 iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2,
1606 be32_to_cpu(hdr->offset), payload_length);
1607 if (iov_ret < 0)
1608 return -1;
1609
1610 iov_count += iov_ret;
1611
1612 padding = ((-payload_length) & 3);
1613 if (padding != 0) {
1614 iov[iov_count].iov_base = cmd->pad_bytes;
1615 iov[iov_count++].iov_len = padding;
1616 rx_size += padding;
1617 pr_debug("Receiving %u padding bytes.\n", padding);
1618 }
1619
1620 if (conn->conn_ops->DataDigest) {
1621 iov[iov_count].iov_base = &checksum;
1622 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1623 rx_size += ISCSI_CRC_LEN;
1624 }
1625
1626 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
1627 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1628
1629 iscsit_unmap_iovec(cmd);
1630
1631 if (rx_got != rx_size)
1632 return -1;
1633
1634 if (conn->conn_ops->DataDigest) {
1635 u32 data_crc;
1636
1637 data_crc = iscsit_crc_sglist(cmd, payload_length, padding,
1638 cmd->pad_bytes);
1639 if (checksum != data_crc) {
1640 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1641 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1642 " does not match computed 0x%08x\n",
1643 hdr->itt, hdr->offset, payload_length,
1644 hdr->datasn, checksum, data_crc);
1645 data_crc_failed = 1;
1646 } else {
1647 pr_debug("Got CRC32C DataDigest 0x%08x for"
1648 " %u bytes of Data Out\n", checksum,
1649 payload_length);
1650 }
1651 }
1652
1653 return data_crc_failed;
1654 }
1655
1656 int
iscsit_check_dataout_payload(struct iscsit_cmd * cmd,struct iscsi_data * hdr,bool data_crc_failed)1657 iscsit_check_dataout_payload(struct iscsit_cmd *cmd, struct iscsi_data *hdr,
1658 bool data_crc_failed)
1659 {
1660 struct iscsit_conn *conn = cmd->conn;
1661 int rc, ooo_cmdsn;
1662 /*
1663 * Increment post receive data and CRC values or perform
1664 * within-command recovery.
1665 */
1666 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1667 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1668 return 0;
1669 else if (rc == DATAOUT_SEND_R2T) {
1670 iscsit_set_dataout_sequence_values(cmd);
1671 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1672 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1673 /*
1674 * Handle extra special case for out of order
1675 * Unsolicited Data Out.
1676 */
1677 spin_lock_bh(&cmd->istate_lock);
1678 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1679 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1680 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1681 spin_unlock_bh(&cmd->istate_lock);
1682
1683 iscsit_stop_dataout_timer(cmd);
1684 if (ooo_cmdsn)
1685 return 0;
1686 target_execute_cmd(&cmd->se_cmd);
1687 return 0;
1688 } else /* DATAOUT_CANNOT_RECOVER */
1689 return -1;
1690
1691 return 0;
1692 }
1693 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1694
iscsit_handle_data_out(struct iscsit_conn * conn,unsigned char * buf)1695 static int iscsit_handle_data_out(struct iscsit_conn *conn, unsigned char *buf)
1696 {
1697 struct iscsit_cmd *cmd = NULL;
1698 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1699 int rc;
1700 bool data_crc_failed = false;
1701
1702 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1703 if (rc < 0)
1704 return 0;
1705 else if (!cmd)
1706 return 0;
1707
1708 rc = iscsit_get_dataout(conn, cmd, hdr);
1709 if (rc < 0)
1710 return rc;
1711 else if (rc > 0)
1712 data_crc_failed = true;
1713
1714 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1715 }
1716
iscsit_setup_nop_out(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_nopout * hdr)1717 int iscsit_setup_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1718 struct iscsi_nopout *hdr)
1719 {
1720 u32 payload_length = ntoh24(hdr->dlength);
1721
1722 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1723 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1724 if (!cmd)
1725 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1726 (unsigned char *)hdr);
1727
1728 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1729 (unsigned char *)hdr);
1730 }
1731
1732 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1733 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1734 " not set, protocol error.\n");
1735 if (!cmd)
1736 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1737 (unsigned char *)hdr);
1738
1739 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1740 (unsigned char *)hdr);
1741 }
1742
1743 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1744 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1745 " greater than MaxXmitDataSegmentLength: %u, protocol"
1746 " error.\n", payload_length,
1747 conn->conn_ops->MaxXmitDataSegmentLength);
1748 if (!cmd)
1749 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1750 (unsigned char *)hdr);
1751
1752 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1753 (unsigned char *)hdr);
1754 }
1755
1756 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1757 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1758 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1759 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1760 payload_length);
1761 /*
1762 * This is not a response to a Unsolicited NopIN, which means
1763 * it can either be a NOPOUT ping request (with a valid ITT),
1764 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1765 * Either way, make sure we allocate an struct iscsit_cmd, as both
1766 * can contain ping data.
1767 */
1768 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1769 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1770 cmd->i_state = ISTATE_SEND_NOPIN;
1771 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1772 1 : 0);
1773 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1774 cmd->targ_xfer_tag = 0xFFFFFFFF;
1775 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1776 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1777 cmd->data_direction = DMA_NONE;
1778 }
1779
1780 return 0;
1781 }
1782 EXPORT_SYMBOL(iscsit_setup_nop_out);
1783
iscsit_process_nop_out(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_nopout * hdr)1784 int iscsit_process_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1785 struct iscsi_nopout *hdr)
1786 {
1787 struct iscsit_cmd *cmd_p = NULL;
1788 int cmdsn_ret = 0;
1789 /*
1790 * Initiator is expecting a NopIN ping reply..
1791 */
1792 if (hdr->itt != RESERVED_ITT) {
1793 if (!cmd)
1794 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1795 (unsigned char *)hdr);
1796
1797 spin_lock_bh(&conn->cmd_lock);
1798 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1799 spin_unlock_bh(&conn->cmd_lock);
1800
1801 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1802
1803 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1804 iscsit_add_cmd_to_response_queue(cmd, conn,
1805 cmd->i_state);
1806 return 0;
1807 }
1808
1809 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1810 (unsigned char *)hdr, hdr->cmdsn);
1811 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1812 return 0;
1813 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1814 return -1;
1815
1816 return 0;
1817 }
1818 /*
1819 * This was a response to a unsolicited NOPIN ping.
1820 */
1821 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1822 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1823 if (!cmd_p)
1824 return -EINVAL;
1825
1826 iscsit_stop_nopin_response_timer(conn);
1827
1828 cmd_p->i_state = ISTATE_REMOVE;
1829 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1830
1831 iscsit_start_nopin_timer(conn);
1832 return 0;
1833 }
1834 /*
1835 * Otherwise, initiator is not expecting a NOPIN is response.
1836 * Just ignore for now.
1837 */
1838
1839 if (cmd)
1840 iscsit_free_cmd(cmd, false);
1841
1842 return 0;
1843 }
1844 EXPORT_SYMBOL(iscsit_process_nop_out);
1845
iscsit_handle_nop_out(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)1846 static int iscsit_handle_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1847 unsigned char *buf)
1848 {
1849 unsigned char *ping_data = NULL;
1850 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1851 struct kvec *iov = NULL;
1852 u32 payload_length = ntoh24(hdr->dlength);
1853 int ret;
1854
1855 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1856 if (ret < 0)
1857 return 0;
1858 /*
1859 * Handle NOP-OUT payload for traditional iSCSI sockets
1860 */
1861 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1862 u32 checksum, data_crc, padding = 0;
1863 int niov = 0, rx_got, rx_size = payload_length;
1864
1865 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1866 if (!ping_data) {
1867 ret = -1;
1868 goto out;
1869 }
1870
1871 iov = &cmd->iov_misc[0];
1872 iov[niov].iov_base = ping_data;
1873 iov[niov++].iov_len = payload_length;
1874
1875 padding = ((-payload_length) & 3);
1876 if (padding != 0) {
1877 pr_debug("Receiving %u additional bytes"
1878 " for padding.\n", padding);
1879 iov[niov].iov_base = &cmd->pad_bytes;
1880 iov[niov++].iov_len = padding;
1881 rx_size += padding;
1882 }
1883 if (conn->conn_ops->DataDigest) {
1884 iov[niov].iov_base = &checksum;
1885 iov[niov++].iov_len = ISCSI_CRC_LEN;
1886 rx_size += ISCSI_CRC_LEN;
1887 }
1888
1889 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc));
1890 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1891 if (rx_got != rx_size) {
1892 ret = -1;
1893 goto out;
1894 }
1895
1896 if (conn->conn_ops->DataDigest) {
1897 data_crc = iscsit_crc_buf(ping_data, payload_length,
1898 padding, cmd->pad_bytes);
1899 if (checksum != data_crc) {
1900 pr_err("Ping data CRC32C DataDigest"
1901 " 0x%08x does not match computed 0x%08x\n",
1902 checksum, data_crc);
1903 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1904 pr_err("Unable to recover from"
1905 " NOPOUT Ping DataCRC failure while in"
1906 " ERL=0.\n");
1907 ret = -1;
1908 goto out;
1909 } else {
1910 /*
1911 * Silently drop this PDU and let the
1912 * initiator plug the CmdSN gap.
1913 */
1914 pr_debug("Dropping NOPOUT"
1915 " Command CmdSN: 0x%08x due to"
1916 " DataCRC error.\n", hdr->cmdsn);
1917 ret = 0;
1918 goto out;
1919 }
1920 } else {
1921 pr_debug("Got CRC32C DataDigest"
1922 " 0x%08x for %u bytes of ping data.\n",
1923 checksum, payload_length);
1924 }
1925 }
1926
1927 ping_data[payload_length] = '\0';
1928 /*
1929 * Attach ping data to struct iscsit_cmd->buf_ptr.
1930 */
1931 cmd->buf_ptr = ping_data;
1932 cmd->buf_ptr_size = payload_length;
1933
1934 pr_debug("Got %u bytes of NOPOUT ping"
1935 " data.\n", payload_length);
1936 pr_debug("Ping Data: \"%s\"\n", ping_data);
1937 }
1938
1939 return iscsit_process_nop_out(conn, cmd, hdr);
1940 out:
1941 if (cmd)
1942 iscsit_free_cmd(cmd, false);
1943
1944 kfree(ping_data);
1945 return ret;
1946 }
1947
iscsit_convert_tmf(u8 iscsi_tmf)1948 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1949 {
1950 switch (iscsi_tmf) {
1951 case ISCSI_TM_FUNC_ABORT_TASK:
1952 return TMR_ABORT_TASK;
1953 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1954 return TMR_ABORT_TASK_SET;
1955 case ISCSI_TM_FUNC_CLEAR_ACA:
1956 return TMR_CLEAR_ACA;
1957 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1958 return TMR_CLEAR_TASK_SET;
1959 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1960 return TMR_LUN_RESET;
1961 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1962 return TMR_TARGET_WARM_RESET;
1963 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1964 return TMR_TARGET_COLD_RESET;
1965 default:
1966 return TMR_UNKNOWN;
1967 }
1968 }
1969
1970 int
iscsit_handle_task_mgt_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)1971 iscsit_handle_task_mgt_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1972 unsigned char *buf)
1973 {
1974 struct se_tmr_req *se_tmr;
1975 struct iscsi_tmr_req *tmr_req;
1976 struct iscsi_tm *hdr;
1977 int out_of_order_cmdsn = 0, ret;
1978 u8 function, tcm_function = TMR_UNKNOWN;
1979
1980 hdr = (struct iscsi_tm *) buf;
1981 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1982 function = hdr->flags;
1983
1984 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1985 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1986 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1987 hdr->rtt, hdr->refcmdsn, conn->cid);
1988
1989 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1990 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1991 hdr->rtt != RESERVED_ITT)) {
1992 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1993 hdr->rtt = RESERVED_ITT;
1994 }
1995
1996 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1997 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1998 pr_err("Task Management Request TASK_REASSIGN not"
1999 " issued as immediate command, bad iSCSI Initiator"
2000 "implementation\n");
2001 return iscsit_add_reject_cmd(cmd,
2002 ISCSI_REASON_PROTOCOL_ERROR, buf);
2003 }
2004 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2005 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
2006 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
2007
2008 cmd->data_direction = DMA_NONE;
2009 cmd->tmr_req = kzalloc_obj(*cmd->tmr_req);
2010 if (!cmd->tmr_req) {
2011 return iscsit_add_reject_cmd(cmd,
2012 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2013 buf);
2014 }
2015
2016 __target_init_cmd(&cmd->se_cmd, &iscsi_ops,
2017 conn->sess->se_sess, 0, DMA_NONE,
2018 TCM_SIMPLE_TAG, cmd->sense_buffer + 2,
2019 scsilun_to_int(&hdr->lun),
2020 conn->cmd_cnt);
2021
2022 target_get_sess_cmd(&cmd->se_cmd, true);
2023
2024 /*
2025 * TASK_REASSIGN for ERL=2 / connection stays inside of
2026 * LIO-Target $FABRIC_MOD
2027 */
2028 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2029 tcm_function = iscsit_convert_tmf(function);
2030 if (tcm_function == TMR_UNKNOWN) {
2031 pr_err("Unknown iSCSI TMR Function:"
2032 " 0x%02x\n", function);
2033 return iscsit_add_reject_cmd(cmd,
2034 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2035 }
2036 }
2037 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2038 GFP_KERNEL);
2039 if (ret < 0)
2040 return iscsit_add_reject_cmd(cmd,
2041 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2042
2043 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2044
2045 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2046 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2047 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2048 cmd->init_task_tag = hdr->itt;
2049 cmd->targ_xfer_tag = 0xFFFFFFFF;
2050 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2051 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2052 se_tmr = cmd->se_cmd.se_tmr_req;
2053 tmr_req = cmd->tmr_req;
2054 /*
2055 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2056 */
2057 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2058 ret = transport_lookup_tmr_lun(&cmd->se_cmd);
2059 if (ret < 0) {
2060 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2061 goto attach;
2062 }
2063 }
2064
2065 switch (function) {
2066 case ISCSI_TM_FUNC_ABORT_TASK:
2067 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2068 if (se_tmr->response)
2069 goto attach;
2070 break;
2071 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2072 case ISCSI_TM_FUNC_CLEAR_ACA:
2073 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2074 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2075 break;
2076 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2077 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2078 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2079 goto attach;
2080 }
2081 break;
2082 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2083 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2084 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2085 goto attach;
2086 }
2087 break;
2088 case ISCSI_TM_FUNC_TASK_REASSIGN:
2089 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2090 /*
2091 * Perform sanity checks on the ExpDataSN only if the
2092 * TASK_REASSIGN was successful.
2093 */
2094 if (se_tmr->response)
2095 break;
2096
2097 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2098 return iscsit_add_reject_cmd(cmd,
2099 ISCSI_REASON_BOOKMARK_INVALID, buf);
2100 break;
2101 default:
2102 pr_err("Unknown TMR function: 0x%02x, protocol"
2103 " error.\n", function);
2104 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2105 goto attach;
2106 }
2107
2108 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2109 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2110 se_tmr->call_transport = 1;
2111 attach:
2112 spin_lock_bh(&conn->cmd_lock);
2113 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2114 spin_unlock_bh(&conn->cmd_lock);
2115
2116 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2117 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2118 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2119 out_of_order_cmdsn = 1;
2120 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2121 target_put_sess_cmd(&cmd->se_cmd);
2122 return 0;
2123 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2124 return -1;
2125 }
2126 }
2127 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2128
2129 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2130 return 0;
2131 /*
2132 * Found the referenced task, send to transport for processing.
2133 */
2134 if (se_tmr->call_transport)
2135 return transport_generic_handle_tmr(&cmd->se_cmd);
2136
2137 /*
2138 * Could not find the referenced LUN, task, or Task Management
2139 * command not authorized or supported. Change state and
2140 * let the tx_thread send the response.
2141 *
2142 * For connection recovery, this is also the default action for
2143 * TMR TASK_REASSIGN.
2144 */
2145 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2146 target_put_sess_cmd(&cmd->se_cmd);
2147 return 0;
2148 }
2149 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2150
2151 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2152 int
iscsit_setup_text_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_text * hdr)2153 iscsit_setup_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2154 struct iscsi_text *hdr)
2155 {
2156 u32 payload_length = ntoh24(hdr->dlength);
2157
2158 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2159 pr_err("Unable to accept text parameter length: %u"
2160 "greater than MaxXmitDataSegmentLength %u.\n",
2161 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2162 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2163 (unsigned char *)hdr);
2164 }
2165
2166 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2167 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2168 pr_err("Multi sequence text commands currently not supported\n");
2169 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2170 (unsigned char *)hdr);
2171 }
2172
2173 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2174 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2175 hdr->exp_statsn, payload_length);
2176
2177 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2178 cmd->i_state = ISTATE_SEND_TEXTRSP;
2179 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2180 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2181 cmd->targ_xfer_tag = 0xFFFFFFFF;
2182 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2183 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2184 cmd->data_direction = DMA_NONE;
2185 kfree(cmd->text_in_ptr);
2186 cmd->text_in_ptr = NULL;
2187
2188 return 0;
2189 }
2190 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2191
2192 int
iscsit_process_text_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_text * hdr)2193 iscsit_process_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2194 struct iscsi_text *hdr)
2195 {
2196 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2197 int cmdsn_ret;
2198
2199 if (!text_in) {
2200 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2201 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2202 pr_err("Unable to locate text_in buffer for sendtargets"
2203 " discovery\n");
2204 goto reject;
2205 }
2206 goto empty_sendtargets;
2207 }
2208 if (strncmp("SendTargets=", text_in, 12) != 0) {
2209 pr_err("Received Text Data that is not"
2210 " SendTargets, cannot continue.\n");
2211 goto reject;
2212 }
2213 /* '=' confirmed in strncmp */
2214 text_ptr = strchr(text_in, '=');
2215 BUG_ON(!text_ptr);
2216 if (!strncmp("=All", text_ptr, 5)) {
2217 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2218 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2219 !strncmp("=eui.", text_ptr, 5)) {
2220 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2221 } else {
2222 pr_err("Unable to locate valid SendTargets%s value\n",
2223 text_ptr);
2224 goto reject;
2225 }
2226
2227 spin_lock_bh(&conn->cmd_lock);
2228 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2229 spin_unlock_bh(&conn->cmd_lock);
2230
2231 empty_sendtargets:
2232 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2233
2234 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2235 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2236 (unsigned char *)hdr, hdr->cmdsn);
2237 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2238 return -1;
2239
2240 return 0;
2241 }
2242
2243 return iscsit_execute_cmd(cmd, 0);
2244
2245 reject:
2246 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2247 (unsigned char *)hdr);
2248 }
2249 EXPORT_SYMBOL(iscsit_process_text_cmd);
2250
2251 static int
iscsit_handle_text_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)2252 iscsit_handle_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2253 unsigned char *buf)
2254 {
2255 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2256 char *text_in = NULL;
2257 u32 payload_length = ntoh24(hdr->dlength);
2258 int rx_size, rc;
2259
2260 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2261 if (rc < 0)
2262 return 0;
2263
2264 rx_size = payload_length;
2265 if (payload_length) {
2266 u32 checksum = 0, data_crc = 0;
2267 u32 padding = 0;
2268 int niov = 0, rx_got;
2269 struct kvec iov[2];
2270
2271 rx_size = ALIGN(payload_length, 4);
2272 text_in = kzalloc(rx_size, GFP_KERNEL);
2273 if (!text_in)
2274 goto reject;
2275
2276 cmd->text_in_ptr = text_in;
2277
2278 memset(iov, 0, sizeof(iov));
2279 iov[niov].iov_base = text_in;
2280 iov[niov++].iov_len = rx_size;
2281
2282 padding = rx_size - payload_length;
2283 if (padding)
2284 pr_debug("Receiving %u additional bytes"
2285 " for padding.\n", padding);
2286 if (conn->conn_ops->DataDigest) {
2287 iov[niov].iov_base = &checksum;
2288 iov[niov++].iov_len = ISCSI_CRC_LEN;
2289 rx_size += ISCSI_CRC_LEN;
2290 }
2291
2292 WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
2293 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2294 if (rx_got != rx_size)
2295 goto reject;
2296
2297 if (conn->conn_ops->DataDigest) {
2298 data_crc = iscsit_crc_buf(text_in,
2299 ALIGN(payload_length, 4),
2300 0, NULL);
2301 if (checksum != data_crc) {
2302 pr_err("Text data CRC32C DataDigest"
2303 " 0x%08x does not match computed"
2304 " 0x%08x\n", checksum, data_crc);
2305 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2306 pr_err("Unable to recover from"
2307 " Text Data digest failure while in"
2308 " ERL=0.\n");
2309 goto reject;
2310 } else {
2311 /*
2312 * Silently drop this PDU and let the
2313 * initiator plug the CmdSN gap.
2314 */
2315 pr_debug("Dropping Text"
2316 " Command CmdSN: 0x%08x due to"
2317 " DataCRC error.\n", hdr->cmdsn);
2318 kfree(text_in);
2319 cmd->text_in_ptr = NULL;
2320 return 0;
2321 }
2322 } else {
2323 pr_debug("Got CRC32C DataDigest"
2324 " 0x%08x for %u bytes of text data.\n",
2325 checksum, payload_length);
2326 }
2327 }
2328 text_in[payload_length - 1] = '\0';
2329 pr_debug("Successfully read %d bytes of text"
2330 " data.\n", payload_length);
2331 }
2332
2333 return iscsit_process_text_cmd(conn, cmd, hdr);
2334
2335 reject:
2336 kfree(cmd->text_in_ptr);
2337 cmd->text_in_ptr = NULL;
2338 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2339 }
2340
iscsit_logout_closesession(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2341 int iscsit_logout_closesession(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2342 {
2343 struct iscsit_conn *conn_p;
2344 struct iscsit_session *sess = conn->sess;
2345
2346 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2347 " for SID: %u.\n", conn->cid, conn->sess->sid);
2348
2349 atomic_set(&sess->session_logout, 1);
2350 atomic_set(&conn->conn_logout_remove, 1);
2351 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2352
2353 iscsit_inc_conn_usage_count(conn);
2354 iscsit_inc_session_usage_count(sess);
2355
2356 spin_lock_bh(&sess->conn_lock);
2357 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2358 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2359 continue;
2360
2361 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2362 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2363 }
2364 spin_unlock_bh(&sess->conn_lock);
2365
2366 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2367
2368 return 0;
2369 }
2370
iscsit_logout_closeconnection(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2371 int iscsit_logout_closeconnection(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2372 {
2373 struct iscsit_conn *l_conn;
2374 struct iscsit_session *sess = conn->sess;
2375
2376 pr_debug("Received logout request CLOSECONNECTION for CID:"
2377 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2378
2379 /*
2380 * A Logout Request with a CLOSECONNECTION reason code for a CID
2381 * can arrive on a connection with a differing CID.
2382 */
2383 if (conn->cid == cmd->logout_cid) {
2384 spin_lock_bh(&conn->state_lock);
2385 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2386 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2387
2388 atomic_set(&conn->conn_logout_remove, 1);
2389 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2390 iscsit_inc_conn_usage_count(conn);
2391
2392 spin_unlock_bh(&conn->state_lock);
2393 } else {
2394 /*
2395 * Handle all different cid CLOSECONNECTION requests in
2396 * iscsit_logout_post_handler_diffcid() as to give enough
2397 * time for any non immediate command's CmdSN to be
2398 * acknowledged on the connection in question.
2399 *
2400 * Here we simply make sure the CID is still around.
2401 */
2402 l_conn = iscsit_get_conn_from_cid(sess,
2403 cmd->logout_cid);
2404 if (!l_conn) {
2405 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2406 iscsit_add_cmd_to_response_queue(cmd, conn,
2407 cmd->i_state);
2408 return 0;
2409 }
2410
2411 iscsit_dec_conn_usage_count(l_conn);
2412 }
2413
2414 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2415
2416 return 0;
2417 }
2418
iscsit_logout_removeconnforrecovery(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2419 int iscsit_logout_removeconnforrecovery(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2420 {
2421 struct iscsit_session *sess = conn->sess;
2422
2423 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2424 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2425
2426 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2427 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2428 " while ERL!=2.\n");
2429 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2430 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2431 return 0;
2432 }
2433
2434 if (conn->cid == cmd->logout_cid) {
2435 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2436 " with CID: %hu on CID: %hu, implementation error.\n",
2437 cmd->logout_cid, conn->cid);
2438 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2439 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2440 return 0;
2441 }
2442
2443 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2444
2445 return 0;
2446 }
2447
2448 int
iscsit_handle_logout_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)2449 iscsit_handle_logout_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2450 unsigned char *buf)
2451 {
2452 int cmdsn_ret, logout_remove = 0;
2453 u8 reason_code = 0;
2454 struct iscsi_logout *hdr;
2455 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2456
2457 hdr = (struct iscsi_logout *) buf;
2458 reason_code = (hdr->flags & 0x7f);
2459
2460 if (tiqn) {
2461 spin_lock(&tiqn->logout_stats.lock);
2462 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2463 tiqn->logout_stats.normal_logouts++;
2464 else
2465 tiqn->logout_stats.abnormal_logouts++;
2466 spin_unlock(&tiqn->logout_stats.lock);
2467 }
2468
2469 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2470 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2471 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2472 hdr->cid, conn->cid);
2473
2474 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2475 pr_err("Received logout request on connection that"
2476 " is not in logged in state, ignoring request.\n");
2477 iscsit_free_cmd(cmd, false);
2478 return 0;
2479 }
2480
2481 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2482 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2483 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2484 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2485 cmd->targ_xfer_tag = 0xFFFFFFFF;
2486 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2487 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2488 cmd->logout_cid = be16_to_cpu(hdr->cid);
2489 cmd->logout_reason = reason_code;
2490 cmd->data_direction = DMA_NONE;
2491
2492 /*
2493 * We need to sleep in these cases (by returning 1) until the Logout
2494 * Response gets sent in the tx thread.
2495 */
2496 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2497 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2498 be16_to_cpu(hdr->cid) == conn->cid))
2499 logout_remove = 1;
2500
2501 spin_lock_bh(&conn->cmd_lock);
2502 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2503 spin_unlock_bh(&conn->cmd_lock);
2504
2505 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2506 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2507
2508 /*
2509 * Immediate commands are executed, well, immediately.
2510 * Non-Immediate Logout Commands are executed in CmdSN order.
2511 */
2512 if (cmd->immediate_cmd) {
2513 int ret = iscsit_execute_cmd(cmd, 0);
2514
2515 if (ret < 0)
2516 return ret;
2517 } else {
2518 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2519 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2520 logout_remove = 0;
2521 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2522 return -1;
2523 }
2524
2525 return logout_remove;
2526 }
2527 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2528
iscsit_handle_snack(struct iscsit_conn * conn,unsigned char * buf)2529 int iscsit_handle_snack(
2530 struct iscsit_conn *conn,
2531 unsigned char *buf)
2532 {
2533 struct iscsi_snack *hdr;
2534
2535 hdr = (struct iscsi_snack *) buf;
2536 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2537
2538 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2539 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2540 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2541 hdr->begrun, hdr->runlength, conn->cid);
2542
2543 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2544 pr_err("Initiator sent SNACK request while in"
2545 " ErrorRecoveryLevel=0.\n");
2546 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2547 buf);
2548 }
2549 /*
2550 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2551 * call from inside iscsi_send_recovery_datain_or_r2t().
2552 */
2553 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2554 case 0:
2555 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2556 hdr->itt,
2557 be32_to_cpu(hdr->ttt),
2558 be32_to_cpu(hdr->begrun),
2559 be32_to_cpu(hdr->runlength));
2560 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2561 return iscsit_handle_status_snack(conn, hdr->itt,
2562 be32_to_cpu(hdr->ttt),
2563 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2564 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2565 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2566 be32_to_cpu(hdr->begrun),
2567 be32_to_cpu(hdr->runlength));
2568 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2569 /* FIXME: Support R-Data SNACK */
2570 pr_err("R-Data SNACK Not Supported.\n");
2571 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2572 buf);
2573 default:
2574 pr_err("Unknown SNACK type 0x%02x, protocol"
2575 " error.\n", hdr->flags & 0x0f);
2576 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2577 buf);
2578 }
2579
2580 return 0;
2581 }
2582 EXPORT_SYMBOL(iscsit_handle_snack);
2583
iscsit_rx_thread_wait_for_tcp(struct iscsit_conn * conn)2584 static void iscsit_rx_thread_wait_for_tcp(struct iscsit_conn *conn)
2585 {
2586 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2587 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2588 wait_for_completion_interruptible_timeout(
2589 &conn->rx_half_close_comp,
2590 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2591 }
2592 }
2593
iscsit_handle_immediate_data(struct iscsit_cmd * cmd,struct iscsi_scsi_req * hdr,u32 length)2594 static int iscsit_handle_immediate_data(
2595 struct iscsit_cmd *cmd,
2596 struct iscsi_scsi_req *hdr,
2597 u32 length)
2598 {
2599 int iov_ret, rx_got = 0, rx_size = 0;
2600 u32 checksum, iov_count = 0, padding = 0;
2601 struct iscsit_conn *conn = cmd->conn;
2602 struct kvec *iov;
2603 void *overflow_buf = NULL;
2604
2605 BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
2606 rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
2607 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
2608 cmd->orig_iov_data_count - 2,
2609 cmd->write_data_done, rx_size);
2610 if (iov_ret < 0)
2611 return IMMEDIATE_DATA_CANNOT_RECOVER;
2612
2613 iov_count = iov_ret;
2614 iov = &cmd->iov_data[0];
2615 if (rx_size < length) {
2616 /*
2617 * Special case: length of immediate data exceeds the data
2618 * buffer size derived from the CDB.
2619 */
2620 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
2621 if (!overflow_buf) {
2622 iscsit_unmap_iovec(cmd);
2623 return IMMEDIATE_DATA_CANNOT_RECOVER;
2624 }
2625 cmd->overflow_buf = overflow_buf;
2626 iov[iov_count].iov_base = overflow_buf;
2627 iov[iov_count].iov_len = length - rx_size;
2628 iov_count++;
2629 rx_size = length;
2630 }
2631
2632 padding = ((-length) & 3);
2633 if (padding != 0) {
2634 iov[iov_count].iov_base = cmd->pad_bytes;
2635 iov[iov_count++].iov_len = padding;
2636 rx_size += padding;
2637 }
2638
2639 if (conn->conn_ops->DataDigest) {
2640 iov[iov_count].iov_base = &checksum;
2641 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2642 rx_size += ISCSI_CRC_LEN;
2643 }
2644
2645 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
2646 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2647
2648 iscsit_unmap_iovec(cmd);
2649
2650 if (rx_got != rx_size) {
2651 iscsit_rx_thread_wait_for_tcp(conn);
2652 return IMMEDIATE_DATA_CANNOT_RECOVER;
2653 }
2654
2655 if (conn->conn_ops->DataDigest) {
2656 u32 data_crc;
2657
2658 data_crc = iscsit_crc_sglist(cmd, length, padding,
2659 cmd->pad_bytes);
2660 if (checksum != data_crc) {
2661 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2662 " does not match computed 0x%08x\n", checksum,
2663 data_crc);
2664
2665 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2666 pr_err("Unable to recover from"
2667 " Immediate Data digest failure while"
2668 " in ERL=0.\n");
2669 iscsit_reject_cmd(cmd,
2670 ISCSI_REASON_DATA_DIGEST_ERROR,
2671 (unsigned char *)hdr);
2672 return IMMEDIATE_DATA_CANNOT_RECOVER;
2673 } else {
2674 iscsit_reject_cmd(cmd,
2675 ISCSI_REASON_DATA_DIGEST_ERROR,
2676 (unsigned char *)hdr);
2677 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2678 }
2679 } else {
2680 pr_debug("Got CRC32C DataDigest 0x%08x for"
2681 " %u bytes of Immediate Data\n", checksum,
2682 length);
2683 }
2684 }
2685
2686 cmd->write_data_done += length;
2687
2688 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2689 spin_lock_bh(&cmd->istate_lock);
2690 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2691 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2692 spin_unlock_bh(&cmd->istate_lock);
2693 }
2694
2695 return IMMEDIATE_DATA_NORMAL_OPERATION;
2696 }
2697
2698 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2699 with active network interface */
iscsit_build_conn_drop_async_message(struct iscsit_conn * conn)2700 static void iscsit_build_conn_drop_async_message(struct iscsit_conn *conn)
2701 {
2702 struct iscsit_cmd *cmd;
2703 struct iscsit_conn *conn_p;
2704 bool found = false;
2705
2706 lockdep_assert_held(&conn->sess->conn_lock);
2707
2708 /*
2709 * Only send a Asynchronous Message on connections whos network
2710 * interface is still functional.
2711 */
2712 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2713 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2714 iscsit_inc_conn_usage_count(conn_p);
2715 found = true;
2716 break;
2717 }
2718 }
2719
2720 if (!found)
2721 return;
2722
2723 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2724 if (!cmd) {
2725 iscsit_dec_conn_usage_count(conn_p);
2726 return;
2727 }
2728
2729 cmd->logout_cid = conn->cid;
2730 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2731 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2732
2733 spin_lock_bh(&conn_p->cmd_lock);
2734 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2735 spin_unlock_bh(&conn_p->cmd_lock);
2736
2737 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2738 iscsit_dec_conn_usage_count(conn_p);
2739 }
2740
iscsit_send_conn_drop_async_message(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2741 static int iscsit_send_conn_drop_async_message(
2742 struct iscsit_cmd *cmd,
2743 struct iscsit_conn *conn)
2744 {
2745 struct iscsi_async *hdr;
2746
2747 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2748
2749 hdr = (struct iscsi_async *) cmd->pdu;
2750 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2751 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2752 cmd->init_task_tag = RESERVED_ITT;
2753 cmd->targ_xfer_tag = 0xFFFFFFFF;
2754 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2755 cmd->stat_sn = conn->stat_sn++;
2756 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2757 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2758 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2759 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2760 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2761 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2762 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2763
2764 pr_debug("Sending Connection Dropped Async Message StatSN:"
2765 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2766 cmd->logout_cid, conn->cid);
2767
2768 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2769 }
2770
iscsit_tx_thread_wait_for_tcp(struct iscsit_conn * conn)2771 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *conn)
2772 {
2773 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2774 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2775 wait_for_completion_interruptible_timeout(
2776 &conn->tx_half_close_comp,
2777 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2778 }
2779 }
2780
2781 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)2782 iscsit_build_datain_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2783 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2784 bool set_statsn)
2785 {
2786 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2787 hdr->flags = datain->flags;
2788 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2789 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2790 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2791 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2792 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2793 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2794 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2795 }
2796 }
2797 hton24(hdr->dlength, datain->length);
2798 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2799 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2800 (struct scsi_lun *)&hdr->lun);
2801 else
2802 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2803
2804 hdr->itt = cmd->init_task_tag;
2805
2806 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2807 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2808 else
2809 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2810 if (set_statsn)
2811 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2812 else
2813 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2814
2815 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2816 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2817 hdr->datasn = cpu_to_be32(datain->data_sn);
2818 hdr->offset = cpu_to_be32(datain->offset);
2819
2820 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2821 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2822 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2823 ntohl(hdr->offset), datain->length, conn->cid);
2824 }
2825 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2826
iscsit_send_datain(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2827 static int iscsit_send_datain(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2828 {
2829 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2830 struct iscsi_datain datain;
2831 struct iscsi_datain_req *dr;
2832 int eodr = 0, ret;
2833 bool set_statsn = false;
2834
2835 memset(&datain, 0, sizeof(struct iscsi_datain));
2836 dr = iscsit_get_datain_values(cmd, &datain);
2837 if (!dr) {
2838 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2839 cmd->init_task_tag);
2840 return -1;
2841 }
2842 /*
2843 * Be paranoid and double check the logic for now.
2844 */
2845 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2846 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2847 " datain.length: %u exceeds cmd->data_length: %u\n",
2848 cmd->init_task_tag, datain.offset, datain.length,
2849 cmd->se_cmd.data_length);
2850 return -1;
2851 }
2852
2853 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2854 /*
2855 * Special case for successfully execution w/ both DATAIN
2856 * and Sense Data.
2857 */
2858 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2859 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2860 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2861 else {
2862 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2863 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2864 iscsit_increment_maxcmdsn(cmd, conn->sess);
2865 cmd->stat_sn = conn->stat_sn++;
2866 set_statsn = true;
2867 } else if (dr->dr_complete ==
2868 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2869 set_statsn = true;
2870 }
2871
2872 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2873
2874 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2875 if (ret < 0)
2876 return ret;
2877
2878 if (dr->dr_complete) {
2879 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2880 2 : 1;
2881 iscsit_free_datain_req(cmd, dr);
2882 }
2883
2884 return eodr;
2885 }
2886
2887 int
iscsit_build_logout_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_logout_rsp * hdr)2888 iscsit_build_logout_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2889 struct iscsi_logout_rsp *hdr)
2890 {
2891 struct iscsit_conn *logout_conn = NULL;
2892 struct iscsi_conn_recovery *cr = NULL;
2893 struct iscsit_session *sess = conn->sess;
2894 /*
2895 * The actual shutting down of Sessions and/or Connections
2896 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2897 * is done in scsi_logout_post_handler().
2898 */
2899 switch (cmd->logout_reason) {
2900 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2901 pr_debug("iSCSI session logout successful, setting"
2902 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2903 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2904 break;
2905 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2906 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2907 break;
2908 /*
2909 * For CLOSECONNECTION logout requests carrying
2910 * a matching logout CID -> local CID, the reference
2911 * for the local CID will have been incremented in
2912 * iscsi_logout_closeconnection().
2913 *
2914 * For CLOSECONNECTION logout requests carrying
2915 * a different CID than the connection it arrived
2916 * on, the connection responding to cmd->logout_cid
2917 * is stopped in iscsit_logout_post_handler_diffcid().
2918 */
2919
2920 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2921 " successful.\n", cmd->logout_cid, conn->cid);
2922 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2923 break;
2924 case ISCSI_LOGOUT_REASON_RECOVERY:
2925 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2926 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2927 break;
2928 /*
2929 * If the connection is still active from our point of view
2930 * force connection recovery to occur.
2931 */
2932 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2933 cmd->logout_cid);
2934 if (logout_conn) {
2935 iscsit_connection_reinstatement_rcfr(logout_conn);
2936 iscsit_dec_conn_usage_count(logout_conn);
2937 }
2938
2939 cr = iscsit_get_inactive_connection_recovery_entry(
2940 conn->sess, cmd->logout_cid);
2941 if (!cr) {
2942 pr_err("Unable to locate CID: %hu for"
2943 " REMOVECONNFORRECOVERY Logout Request.\n",
2944 cmd->logout_cid);
2945 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2946 break;
2947 }
2948
2949 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2950
2951 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2952 " for recovery for CID: %hu on CID: %hu successful.\n",
2953 cmd->logout_cid, conn->cid);
2954 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2955 break;
2956 default:
2957 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2958 cmd->logout_reason);
2959 return -1;
2960 }
2961
2962 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2963 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2964 hdr->response = cmd->logout_response;
2965 hdr->itt = cmd->init_task_tag;
2966 cmd->stat_sn = conn->stat_sn++;
2967 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2968
2969 iscsit_increment_maxcmdsn(cmd, conn->sess);
2970 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2971 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2972
2973 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2974 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2975 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2976 cmd->logout_cid, conn->cid);
2977
2978 return 0;
2979 }
2980 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2981
2982 static int
iscsit_send_logout(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2983 iscsit_send_logout(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2984 {
2985 int rc;
2986
2987 rc = iscsit_build_logout_rsp(cmd, conn,
2988 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2989 if (rc < 0)
2990 return rc;
2991
2992 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2993 }
2994
2995 void
iscsit_build_nopin_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_nopin * hdr,bool nopout_response)2996 iscsit_build_nopin_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2997 struct iscsi_nopin *hdr, bool nopout_response)
2998 {
2999 hdr->opcode = ISCSI_OP_NOOP_IN;
3000 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3001 hton24(hdr->dlength, cmd->buf_ptr_size);
3002 if (nopout_response)
3003 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
3004 hdr->itt = cmd->init_task_tag;
3005 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3006 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
3007 conn->stat_sn;
3008 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3009
3010 if (nopout_response)
3011 iscsit_increment_maxcmdsn(cmd, conn->sess);
3012
3013 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3014 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3015
3016 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3017 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3018 "Solicited" : "Unsolicited", cmd->init_task_tag,
3019 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3020 }
3021 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3022
3023 /*
3024 * Unsolicited NOPIN, either requesting a response or not.
3025 */
iscsit_send_unsolicited_nopin(struct iscsit_cmd * cmd,struct iscsit_conn * conn,int want_response)3026 static int iscsit_send_unsolicited_nopin(
3027 struct iscsit_cmd *cmd,
3028 struct iscsit_conn *conn,
3029 int want_response)
3030 {
3031 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3032 int ret;
3033
3034 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3035
3036 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3037 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3038
3039 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3040 if (ret < 0)
3041 return ret;
3042
3043 spin_lock_bh(&cmd->istate_lock);
3044 cmd->i_state = want_response ?
3045 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3046 spin_unlock_bh(&cmd->istate_lock);
3047
3048 return 0;
3049 }
3050
3051 static int
iscsit_send_nopin(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3052 iscsit_send_nopin(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3053 {
3054 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3055
3056 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3057
3058 /*
3059 * NOPOUT Ping Data is attached to struct iscsit_cmd->buf_ptr.
3060 * NOPOUT DataSegmentLength is at struct iscsit_cmd->buf_ptr_size.
3061 */
3062 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3063
3064 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3065 cmd->buf_ptr,
3066 cmd->buf_ptr_size);
3067 }
3068
iscsit_send_r2t(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3069 static int iscsit_send_r2t(
3070 struct iscsit_cmd *cmd,
3071 struct iscsit_conn *conn)
3072 {
3073 struct iscsi_r2t *r2t;
3074 struct iscsi_r2t_rsp *hdr;
3075 int ret;
3076
3077 r2t = iscsit_get_r2t_from_list(cmd);
3078 if (!r2t)
3079 return -1;
3080
3081 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3082 memset(hdr, 0, ISCSI_HDR_LEN);
3083 hdr->opcode = ISCSI_OP_R2T;
3084 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3085 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3086 (struct scsi_lun *)&hdr->lun);
3087 hdr->itt = cmd->init_task_tag;
3088 if (conn->conn_transport->iscsit_get_r2t_ttt)
3089 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3090 else
3091 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3092 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3093 hdr->statsn = cpu_to_be32(conn->stat_sn);
3094 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3095 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3096 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3097 hdr->data_offset = cpu_to_be32(r2t->offset);
3098 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3099
3100 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3101 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3102 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3103 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3104 r2t->offset, r2t->xfer_len, conn->cid);
3105
3106 spin_lock_bh(&cmd->r2t_lock);
3107 r2t->sent_r2t = 1;
3108 spin_unlock_bh(&cmd->r2t_lock);
3109
3110 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3111 if (ret < 0) {
3112 return ret;
3113 }
3114
3115 spin_lock_bh(&cmd->dataout_timeout_lock);
3116 iscsit_start_dataout_timer(cmd, conn);
3117 spin_unlock_bh(&cmd->dataout_timeout_lock);
3118
3119 return 0;
3120 }
3121
3122 /*
3123 * @recovery: If called from iscsi_task_reassign_complete_write() for
3124 * connection recovery.
3125 */
iscsit_build_r2ts_for_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,bool recovery)3126 int iscsit_build_r2ts_for_cmd(
3127 struct iscsit_conn *conn,
3128 struct iscsit_cmd *cmd,
3129 bool recovery)
3130 {
3131 int first_r2t = 1;
3132 u32 offset = 0, xfer_len = 0;
3133
3134 spin_lock_bh(&cmd->r2t_lock);
3135 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3136 spin_unlock_bh(&cmd->r2t_lock);
3137 return 0;
3138 }
3139
3140 if (conn->sess->sess_ops->DataSequenceInOrder &&
3141 !recovery)
3142 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3143
3144 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3145 if (conn->sess->sess_ops->DataSequenceInOrder) {
3146 offset = cmd->r2t_offset;
3147
3148 if (first_r2t && recovery) {
3149 int new_data_end = offset +
3150 conn->sess->sess_ops->MaxBurstLength -
3151 cmd->next_burst_len;
3152
3153 if (new_data_end > cmd->se_cmd.data_length)
3154 xfer_len = cmd->se_cmd.data_length - offset;
3155 else
3156 xfer_len =
3157 conn->sess->sess_ops->MaxBurstLength -
3158 cmd->next_burst_len;
3159 } else {
3160 int new_data_end = offset +
3161 conn->sess->sess_ops->MaxBurstLength;
3162
3163 if (new_data_end > cmd->se_cmd.data_length)
3164 xfer_len = cmd->se_cmd.data_length - offset;
3165 else
3166 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3167 }
3168
3169 if ((s32)xfer_len < 0) {
3170 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3171 break;
3172 }
3173
3174 cmd->r2t_offset += xfer_len;
3175
3176 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3177 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3178 } else {
3179 struct iscsi_seq *seq;
3180
3181 seq = iscsit_get_seq_holder_for_r2t(cmd);
3182 if (!seq) {
3183 spin_unlock_bh(&cmd->r2t_lock);
3184 return -1;
3185 }
3186
3187 offset = seq->offset;
3188 xfer_len = seq->xfer_len;
3189
3190 if (cmd->seq_send_order == cmd->seq_count)
3191 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3192 }
3193 cmd->outstanding_r2ts++;
3194 first_r2t = 0;
3195
3196 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3197 spin_unlock_bh(&cmd->r2t_lock);
3198 return -1;
3199 }
3200
3201 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3202 break;
3203 }
3204 spin_unlock_bh(&cmd->r2t_lock);
3205
3206 return 0;
3207 }
3208 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3209
iscsit_build_rsp_pdu(struct iscsit_cmd * cmd,struct iscsit_conn * conn,bool inc_stat_sn,struct iscsi_scsi_rsp * hdr)3210 void iscsit_build_rsp_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3211 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3212 {
3213 if (inc_stat_sn)
3214 cmd->stat_sn = conn->stat_sn++;
3215
3216 atomic_long_inc(&conn->sess->rsp_pdus);
3217
3218 memset(hdr, 0, ISCSI_HDR_LEN);
3219 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3220 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3221 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3222 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3223 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3224 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3225 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3226 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3227 }
3228 hdr->response = cmd->iscsi_response;
3229 hdr->cmd_status = cmd->se_cmd.scsi_status;
3230 hdr->itt = cmd->init_task_tag;
3231 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3232
3233 iscsit_increment_maxcmdsn(cmd, conn->sess);
3234 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3235 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3236
3237 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3238 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3239 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3240 cmd->se_cmd.scsi_status, conn->cid);
3241 }
3242 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3243
iscsit_send_response(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3244 static int iscsit_send_response(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3245 {
3246 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3247 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3248 void *data_buf = NULL;
3249 u32 padding = 0, data_buf_len = 0;
3250
3251 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3252
3253 /*
3254 * Attach SENSE DATA payload to iSCSI Response PDU
3255 */
3256 if (cmd->se_cmd.sense_buffer &&
3257 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3258 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3259 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3260 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3261
3262 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3263 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3264 data_buf = cmd->sense_buffer;
3265 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3266
3267 if (padding) {
3268 memset(cmd->sense_buffer +
3269 cmd->se_cmd.scsi_sense_length, 0, padding);
3270 pr_debug("Adding %u bytes of padding to"
3271 " SENSE.\n", padding);
3272 }
3273
3274 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3275 " Response PDU\n",
3276 cmd->se_cmd.scsi_sense_length);
3277 }
3278
3279 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3280 data_buf_len);
3281 }
3282
iscsit_convert_tcm_tmr_rsp(struct se_tmr_req * se_tmr)3283 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3284 {
3285 switch (se_tmr->response) {
3286 case TMR_FUNCTION_COMPLETE:
3287 return ISCSI_TMF_RSP_COMPLETE;
3288 case TMR_TASK_DOES_NOT_EXIST:
3289 return ISCSI_TMF_RSP_NO_TASK;
3290 case TMR_LUN_DOES_NOT_EXIST:
3291 return ISCSI_TMF_RSP_NO_LUN;
3292 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3293 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3294 case TMR_FUNCTION_REJECTED:
3295 default:
3296 return ISCSI_TMF_RSP_REJECTED;
3297 }
3298 }
3299
3300 void
iscsit_build_task_mgt_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_tm_rsp * hdr)3301 iscsit_build_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3302 struct iscsi_tm_rsp *hdr)
3303 {
3304 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3305
3306 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3307 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3308 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3309 hdr->itt = cmd->init_task_tag;
3310 cmd->stat_sn = conn->stat_sn++;
3311 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3312
3313 iscsit_increment_maxcmdsn(cmd, conn->sess);
3314 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3315 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3316
3317 pr_debug("Built Task Management Response ITT: 0x%08x,"
3318 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3319 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3320 }
3321 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3322
3323 static int
iscsit_send_task_mgt_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3324 iscsit_send_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3325 {
3326 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3327
3328 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3329
3330 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3331 }
3332
3333 #define SENDTARGETS_BUF_LIMIT 32768U
3334
3335 static int
iscsit_build_sendtargets_response(struct iscsit_cmd * cmd,enum iscsit_transport_type network_transport,int skip_bytes,bool * completed)3336 iscsit_build_sendtargets_response(struct iscsit_cmd *cmd,
3337 enum iscsit_transport_type network_transport,
3338 int skip_bytes, bool *completed)
3339 {
3340 char *payload = NULL;
3341 struct iscsit_conn *conn = cmd->conn;
3342 struct iscsi_portal_group *tpg;
3343 struct iscsi_tiqn *tiqn;
3344 struct iscsi_tpg_np *tpg_np;
3345 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3346 int target_name_printed;
3347 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3348 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3349 bool active;
3350
3351 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3352 SENDTARGETS_BUF_LIMIT);
3353
3354 payload = kzalloc(buffer_len, GFP_KERNEL);
3355 if (!payload)
3356 return -ENOMEM;
3357
3358 /*
3359 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3360 * explicit case..
3361 */
3362 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3363 text_ptr = strchr(text_in, '=');
3364 if (!text_ptr) {
3365 pr_err("Unable to locate '=' string in text_in:"
3366 " %s\n", text_in);
3367 kfree(payload);
3368 return -EINVAL;
3369 }
3370 /*
3371 * Skip over '=' character..
3372 */
3373 text_ptr += 1;
3374 }
3375
3376 spin_lock(&tiqn_lock);
3377 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3378 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3379 strcmp(tiqn->tiqn, text_ptr)) {
3380 continue;
3381 }
3382
3383 target_name_printed = 0;
3384
3385 spin_lock(&tiqn->tiqn_tpg_lock);
3386 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3387
3388 /* If demo_mode_discovery=0 and generate_node_acls=0
3389 * (demo mode dislabed) do not return
3390 * TargetName+TargetAddress unless a NodeACL exists.
3391 */
3392
3393 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3394 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3395 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3396 cmd->conn->sess->sess_ops->InitiatorName))) {
3397 continue;
3398 }
3399
3400 spin_lock(&tpg->tpg_state_lock);
3401 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3402 spin_unlock(&tpg->tpg_state_lock);
3403
3404 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3405 continue;
3406
3407 spin_lock(&tpg->tpg_np_lock);
3408 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3409 tpg_np_list) {
3410 struct iscsi_np *np = tpg_np->tpg_np;
3411 struct sockaddr_storage *sockaddr;
3412
3413 if (np->np_network_transport != network_transport)
3414 continue;
3415
3416 if (!target_name_printed) {
3417 len = sprintf(buf, "TargetName=%s",
3418 tiqn->tiqn);
3419 len += 1;
3420
3421 if ((len + payload_len) > buffer_len) {
3422 spin_unlock(&tpg->tpg_np_lock);
3423 spin_unlock(&tiqn->tiqn_tpg_lock);
3424 end_of_buf = 1;
3425 goto eob;
3426 }
3427
3428 if (skip_bytes && len <= skip_bytes) {
3429 skip_bytes -= len;
3430 } else {
3431 memcpy(payload + payload_len, buf, len);
3432 payload_len += len;
3433 target_name_printed = 1;
3434 if (len > skip_bytes)
3435 skip_bytes = 0;
3436 }
3437 }
3438
3439 if (inet_addr_is_any(&np->np_sockaddr))
3440 sockaddr = &conn->local_sockaddr;
3441 else
3442 sockaddr = &np->np_sockaddr;
3443
3444 len = sprintf(buf, "TargetAddress="
3445 "%pISpc,%hu",
3446 sockaddr,
3447 tpg->tpgt);
3448 len += 1;
3449
3450 if ((len + payload_len) > buffer_len) {
3451 spin_unlock(&tpg->tpg_np_lock);
3452 spin_unlock(&tiqn->tiqn_tpg_lock);
3453 end_of_buf = 1;
3454 goto eob;
3455 }
3456
3457 if (skip_bytes && len <= skip_bytes) {
3458 skip_bytes -= len;
3459 } else {
3460 memcpy(payload + payload_len, buf, len);
3461 payload_len += len;
3462 if (len > skip_bytes)
3463 skip_bytes = 0;
3464 }
3465 }
3466 spin_unlock(&tpg->tpg_np_lock);
3467 }
3468 spin_unlock(&tiqn->tiqn_tpg_lock);
3469 eob:
3470 if (end_of_buf) {
3471 *completed = false;
3472 break;
3473 }
3474
3475 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3476 break;
3477 }
3478 spin_unlock(&tiqn_lock);
3479
3480 cmd->buf_ptr = payload;
3481
3482 return payload_len;
3483 }
3484
3485 int
iscsit_build_text_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_text_rsp * hdr,enum iscsit_transport_type network_transport)3486 iscsit_build_text_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3487 struct iscsi_text_rsp *hdr,
3488 enum iscsit_transport_type network_transport)
3489 {
3490 int text_length, padding;
3491 bool completed = true;
3492
3493 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3494 cmd->read_data_done,
3495 &completed);
3496 if (text_length < 0)
3497 return text_length;
3498
3499 if (completed) {
3500 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3501 } else {
3502 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3503 cmd->read_data_done += text_length;
3504 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3505 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3506 }
3507 hdr->opcode = ISCSI_OP_TEXT_RSP;
3508 padding = ((-text_length) & 3);
3509 hton24(hdr->dlength, text_length);
3510 hdr->itt = cmd->init_task_tag;
3511 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3512 cmd->stat_sn = conn->stat_sn++;
3513 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3514
3515 iscsit_increment_maxcmdsn(cmd, conn->sess);
3516 /*
3517 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3518 * correctly increment MaxCmdSN for each response answering a
3519 * non immediate text request with a valid CmdSN.
3520 */
3521 cmd->maxcmdsn_inc = 0;
3522 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3523 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3524
3525 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3526 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3527 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3528 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3529 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3530
3531 return text_length + padding;
3532 }
3533 EXPORT_SYMBOL(iscsit_build_text_rsp);
3534
iscsit_send_text_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3535 static int iscsit_send_text_rsp(
3536 struct iscsit_cmd *cmd,
3537 struct iscsit_conn *conn)
3538 {
3539 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3540 int text_length;
3541
3542 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3543 conn->conn_transport->transport_type);
3544 if (text_length < 0)
3545 return text_length;
3546
3547 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3548 cmd->buf_ptr,
3549 text_length);
3550 }
3551
3552 void
iscsit_build_reject(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_reject * hdr)3553 iscsit_build_reject(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3554 struct iscsi_reject *hdr)
3555 {
3556 hdr->opcode = ISCSI_OP_REJECT;
3557 hdr->reason = cmd->reject_reason;
3558 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3559 hton24(hdr->dlength, ISCSI_HDR_LEN);
3560 hdr->ffffffff = cpu_to_be32(0xffffffff);
3561 cmd->stat_sn = conn->stat_sn++;
3562 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3563 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3564 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3565
3566 }
3567 EXPORT_SYMBOL(iscsit_build_reject);
3568
iscsit_send_reject(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3569 static int iscsit_send_reject(
3570 struct iscsit_cmd *cmd,
3571 struct iscsit_conn *conn)
3572 {
3573 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3574
3575 iscsit_build_reject(cmd, conn, hdr);
3576
3577 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3578 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3579
3580 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3581 cmd->buf_ptr,
3582 ISCSI_HDR_LEN);
3583 }
3584
iscsit_thread_get_cpumask(struct iscsit_conn * conn)3585 void iscsit_thread_get_cpumask(struct iscsit_conn *conn)
3586 {
3587 int ord, cpu;
3588 cpumask_var_t conn_allowed_cpumask;
3589
3590 /*
3591 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3592 * within iscsit_start_kthreads()
3593 *
3594 * Here we use bitmap_id to determine which CPU that this
3595 * iSCSI connection's RX/TX threads will be scheduled to
3596 * execute upon.
3597 */
3598 if (!zalloc_cpumask_var(&conn_allowed_cpumask, GFP_KERNEL)) {
3599 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3600 for_each_online_cpu(cpu) {
3601 if (ord-- == 0) {
3602 cpumask_set_cpu(cpu, conn->conn_cpumask);
3603 return;
3604 }
3605 }
3606 } else {
3607 cpumask_and(conn_allowed_cpumask, iscsit_global->allowed_cpumask,
3608 cpu_online_mask);
3609
3610 cpumask_clear(conn->conn_cpumask);
3611 ord = conn->bitmap_id % cpumask_weight(conn_allowed_cpumask);
3612 for_each_cpu(cpu, conn_allowed_cpumask) {
3613 if (ord-- == 0) {
3614 cpumask_set_cpu(cpu, conn->conn_cpumask);
3615 free_cpumask_var(conn_allowed_cpumask);
3616 return;
3617 }
3618 }
3619 free_cpumask_var(conn_allowed_cpumask);
3620 }
3621 /*
3622 * This should never be reached..
3623 */
3624 dump_stack();
3625 cpumask_setall(conn->conn_cpumask);
3626 }
3627
iscsit_thread_reschedule(struct iscsit_conn * conn)3628 static void iscsit_thread_reschedule(struct iscsit_conn *conn)
3629 {
3630 /*
3631 * If iscsit_global->allowed_cpumask modified, reschedule iSCSI
3632 * connection's RX/TX threads update conn->allowed_cpumask.
3633 */
3634 if (!cpumask_equal(iscsit_global->allowed_cpumask,
3635 conn->allowed_cpumask)) {
3636 iscsit_thread_get_cpumask(conn);
3637 conn->conn_tx_reset_cpumask = 1;
3638 conn->conn_rx_reset_cpumask = 1;
3639 cpumask_copy(conn->allowed_cpumask,
3640 iscsit_global->allowed_cpumask);
3641 }
3642 }
3643
iscsit_thread_check_cpumask(struct iscsit_conn * conn,struct task_struct * p,int mode)3644 void iscsit_thread_check_cpumask(
3645 struct iscsit_conn *conn,
3646 struct task_struct *p,
3647 int mode)
3648 {
3649 /*
3650 * The TX and RX threads maybe call iscsit_thread_check_cpumask()
3651 * at the same time. The RX thread might be faster and return from
3652 * iscsit_thread_reschedule() with conn_rx_reset_cpumask set to 0.
3653 * Then the TX thread sets it back to 1.
3654 * The next time the RX thread loops, it sees conn_rx_reset_cpumask
3655 * set to 1 and calls set_cpus_allowed_ptr() again and set it to 0.
3656 */
3657 iscsit_thread_reschedule(conn);
3658
3659 /*
3660 * mode == 1 signals iscsi_target_tx_thread() usage.
3661 * mode == 0 signals iscsi_target_rx_thread() usage.
3662 */
3663 if (mode == 1) {
3664 if (!conn->conn_tx_reset_cpumask)
3665 return;
3666 } else {
3667 if (!conn->conn_rx_reset_cpumask)
3668 return;
3669 }
3670
3671 /*
3672 * Update the CPU mask for this single kthread so that
3673 * both TX and RX kthreads are scheduled to run on the
3674 * same CPU.
3675 */
3676 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3677 if (mode == 1)
3678 conn->conn_tx_reset_cpumask = 0;
3679 else
3680 conn->conn_rx_reset_cpumask = 0;
3681 }
3682 EXPORT_SYMBOL(iscsit_thread_check_cpumask);
3683
3684 int
iscsit_immediate_queue(struct iscsit_conn * conn,struct iscsit_cmd * cmd,int state)3685 iscsit_immediate_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
3686 {
3687 int ret;
3688
3689 switch (state) {
3690 case ISTATE_SEND_R2T:
3691 ret = iscsit_send_r2t(cmd, conn);
3692 if (ret < 0)
3693 goto err;
3694 break;
3695 case ISTATE_REMOVE:
3696 spin_lock_bh(&conn->cmd_lock);
3697 list_del_init(&cmd->i_conn_node);
3698 spin_unlock_bh(&conn->cmd_lock);
3699
3700 iscsit_free_cmd(cmd, false);
3701 break;
3702 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3703 iscsit_mod_nopin_response_timer(conn);
3704 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3705 if (ret < 0)
3706 goto err;
3707 break;
3708 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3709 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3710 if (ret < 0)
3711 goto err;
3712 break;
3713 default:
3714 pr_err("Unknown Opcode: 0x%02x ITT:"
3715 " 0x%08x, i_state: %d on CID: %hu\n",
3716 cmd->iscsi_opcode, cmd->init_task_tag, state,
3717 conn->cid);
3718 goto err;
3719 }
3720
3721 return 0;
3722
3723 err:
3724 return -1;
3725 }
3726 EXPORT_SYMBOL(iscsit_immediate_queue);
3727
3728 static int
iscsit_handle_immediate_queue(struct iscsit_conn * conn)3729 iscsit_handle_immediate_queue(struct iscsit_conn *conn)
3730 {
3731 struct iscsit_transport *t = conn->conn_transport;
3732 struct iscsi_queue_req *qr;
3733 struct iscsit_cmd *cmd;
3734 u8 state;
3735 int ret;
3736
3737 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3738 atomic_set(&conn->check_immediate_queue, 0);
3739 cmd = qr->cmd;
3740 state = qr->state;
3741 kmem_cache_free(lio_qr_cache, qr);
3742
3743 ret = t->iscsit_immediate_queue(conn, cmd, state);
3744 if (ret < 0)
3745 return ret;
3746 }
3747
3748 return 0;
3749 }
3750
3751 int
iscsit_response_queue(struct iscsit_conn * conn,struct iscsit_cmd * cmd,int state)3752 iscsit_response_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
3753 {
3754 int ret;
3755
3756 check_rsp_state:
3757 switch (state) {
3758 case ISTATE_SEND_DATAIN:
3759 ret = iscsit_send_datain(cmd, conn);
3760 if (ret < 0)
3761 goto err;
3762 else if (!ret)
3763 /* more drs */
3764 goto check_rsp_state;
3765 else if (ret == 1) {
3766 /* all done */
3767 spin_lock_bh(&cmd->istate_lock);
3768 cmd->i_state = ISTATE_SENT_STATUS;
3769 spin_unlock_bh(&cmd->istate_lock);
3770
3771 if (atomic_read(&conn->check_immediate_queue))
3772 return 1;
3773
3774 return 0;
3775 } else if (ret == 2) {
3776 /* Still must send status,
3777 SCF_TRANSPORT_TASK_SENSE was set */
3778 spin_lock_bh(&cmd->istate_lock);
3779 cmd->i_state = ISTATE_SEND_STATUS;
3780 spin_unlock_bh(&cmd->istate_lock);
3781 state = ISTATE_SEND_STATUS;
3782 goto check_rsp_state;
3783 }
3784
3785 break;
3786 case ISTATE_SEND_STATUS:
3787 case ISTATE_SEND_STATUS_RECOVERY:
3788 ret = iscsit_send_response(cmd, conn);
3789 break;
3790 case ISTATE_SEND_LOGOUTRSP:
3791 ret = iscsit_send_logout(cmd, conn);
3792 break;
3793 case ISTATE_SEND_ASYNCMSG:
3794 ret = iscsit_send_conn_drop_async_message(
3795 cmd, conn);
3796 break;
3797 case ISTATE_SEND_NOPIN:
3798 ret = iscsit_send_nopin(cmd, conn);
3799 break;
3800 case ISTATE_SEND_REJECT:
3801 ret = iscsit_send_reject(cmd, conn);
3802 break;
3803 case ISTATE_SEND_TASKMGTRSP:
3804 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3805 if (ret != 0)
3806 break;
3807 ret = iscsit_tmr_post_handler(cmd, conn);
3808 if (ret != 0)
3809 iscsit_fall_back_to_erl0(conn->sess);
3810 break;
3811 case ISTATE_SEND_TEXTRSP:
3812 ret = iscsit_send_text_rsp(cmd, conn);
3813 break;
3814 default:
3815 pr_err("Unknown Opcode: 0x%02x ITT:"
3816 " 0x%08x, i_state: %d on CID: %hu\n",
3817 cmd->iscsi_opcode, cmd->init_task_tag,
3818 state, conn->cid);
3819 goto err;
3820 }
3821 if (ret < 0)
3822 goto err;
3823
3824 switch (state) {
3825 case ISTATE_SEND_LOGOUTRSP:
3826 if (!iscsit_logout_post_handler(cmd, conn))
3827 return -ECONNRESET;
3828 fallthrough;
3829 case ISTATE_SEND_STATUS:
3830 case ISTATE_SEND_ASYNCMSG:
3831 case ISTATE_SEND_NOPIN:
3832 case ISTATE_SEND_STATUS_RECOVERY:
3833 case ISTATE_SEND_TEXTRSP:
3834 case ISTATE_SEND_TASKMGTRSP:
3835 case ISTATE_SEND_REJECT:
3836 spin_lock_bh(&cmd->istate_lock);
3837 cmd->i_state = ISTATE_SENT_STATUS;
3838 spin_unlock_bh(&cmd->istate_lock);
3839 break;
3840 default:
3841 pr_err("Unknown Opcode: 0x%02x ITT:"
3842 " 0x%08x, i_state: %d on CID: %hu\n",
3843 cmd->iscsi_opcode, cmd->init_task_tag,
3844 cmd->i_state, conn->cid);
3845 goto err;
3846 }
3847
3848 if (atomic_read(&conn->check_immediate_queue))
3849 return 1;
3850
3851 return 0;
3852
3853 err:
3854 return -1;
3855 }
3856 EXPORT_SYMBOL(iscsit_response_queue);
3857
iscsit_handle_response_queue(struct iscsit_conn * conn)3858 static int iscsit_handle_response_queue(struct iscsit_conn *conn)
3859 {
3860 struct iscsit_transport *t = conn->conn_transport;
3861 struct iscsi_queue_req *qr;
3862 struct iscsit_cmd *cmd;
3863 u8 state;
3864 int ret;
3865
3866 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3867 cmd = qr->cmd;
3868 state = qr->state;
3869 kmem_cache_free(lio_qr_cache, qr);
3870
3871 ret = t->iscsit_response_queue(conn, cmd, state);
3872 if (ret == 1 || ret < 0)
3873 return ret;
3874 }
3875
3876 return 0;
3877 }
3878
iscsi_target_tx_thread(void * arg)3879 int iscsi_target_tx_thread(void *arg)
3880 {
3881 int ret = 0;
3882 struct iscsit_conn *conn = arg;
3883 bool conn_freed = false;
3884
3885 /*
3886 * Allow ourselves to be interrupted by SIGINT so that a
3887 * connection recovery / failure event can be triggered externally.
3888 */
3889 allow_signal(SIGINT);
3890
3891 while (!kthread_should_stop()) {
3892 /*
3893 * Ensure that both TX and RX per connection kthreads
3894 * are scheduled to run on the same CPU.
3895 */
3896 iscsit_thread_check_cpumask(conn, current, 1);
3897
3898 wait_event_interruptible(conn->queues_wq,
3899 !iscsit_conn_all_queues_empty(conn));
3900
3901 if (signal_pending(current))
3902 goto transport_err;
3903
3904 get_immediate:
3905 ret = iscsit_handle_immediate_queue(conn);
3906 if (ret < 0)
3907 goto transport_err;
3908
3909 ret = iscsit_handle_response_queue(conn);
3910 if (ret == 1) {
3911 goto get_immediate;
3912 } else if (ret == -ECONNRESET) {
3913 conn_freed = true;
3914 goto out;
3915 } else if (ret < 0) {
3916 goto transport_err;
3917 }
3918 }
3919
3920 transport_err:
3921 /*
3922 * Avoid the normal connection failure code-path if this connection
3923 * is still within LOGIN mode, and iscsi_np process context is
3924 * responsible for cleaning up the early connection failure.
3925 */
3926 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3927 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3928 out:
3929 if (!conn_freed) {
3930 while (!kthread_should_stop()) {
3931 msleep(100);
3932 }
3933 }
3934 return 0;
3935 }
3936
iscsi_target_rx_opcode(struct iscsit_conn * conn,unsigned char * buf)3937 static int iscsi_target_rx_opcode(struct iscsit_conn *conn, unsigned char *buf)
3938 {
3939 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3940 struct iscsit_cmd *cmd;
3941 int ret = 0;
3942
3943 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3944 case ISCSI_OP_SCSI_CMD:
3945 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3946 if (!cmd)
3947 goto reject;
3948
3949 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3950 break;
3951 case ISCSI_OP_SCSI_DATA_OUT:
3952 ret = iscsit_handle_data_out(conn, buf);
3953 break;
3954 case ISCSI_OP_NOOP_OUT:
3955 cmd = NULL;
3956 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3957 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3958 if (!cmd)
3959 goto reject;
3960 }
3961 ret = iscsit_handle_nop_out(conn, cmd, buf);
3962 break;
3963 case ISCSI_OP_SCSI_TMFUNC:
3964 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3965 if (!cmd)
3966 goto reject;
3967
3968 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3969 break;
3970 case ISCSI_OP_TEXT:
3971 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3972 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3973 if (!cmd)
3974 goto reject;
3975 } else {
3976 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3977 if (!cmd)
3978 goto reject;
3979 }
3980
3981 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3982 break;
3983 case ISCSI_OP_LOGOUT:
3984 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3985 if (!cmd)
3986 goto reject;
3987
3988 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3989 if (ret > 0)
3990 wait_for_completion_timeout(&conn->conn_logout_comp,
3991 SECONDS_FOR_LOGOUT_COMP * HZ);
3992 break;
3993 case ISCSI_OP_SNACK:
3994 ret = iscsit_handle_snack(conn, buf);
3995 break;
3996 default:
3997 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3998 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3999 pr_err("Cannot recover from unknown"
4000 " opcode while ERL=0, closing iSCSI connection.\n");
4001 return -1;
4002 }
4003 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
4004 " closing iSCSI connection.\n");
4005 ret = -1;
4006 break;
4007 }
4008
4009 return ret;
4010 reject:
4011 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4012 }
4013
iscsi_target_check_conn_state(struct iscsit_conn * conn)4014 static bool iscsi_target_check_conn_state(struct iscsit_conn *conn)
4015 {
4016 bool ret;
4017
4018 spin_lock_bh(&conn->state_lock);
4019 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
4020 spin_unlock_bh(&conn->state_lock);
4021
4022 return ret;
4023 }
4024
iscsit_get_rx_pdu(struct iscsit_conn * conn)4025 static void iscsit_get_rx_pdu(struct iscsit_conn *conn)
4026 {
4027 int ret;
4028 u8 *buffer, *tmp_buf, opcode;
4029 u32 checksum = 0, digest = 0;
4030 struct iscsi_hdr *hdr;
4031 struct kvec iov;
4032
4033 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
4034 if (!buffer)
4035 return;
4036
4037 while (!kthread_should_stop()) {
4038 /*
4039 * Ensure that both TX and RX per connection kthreads
4040 * are scheduled to run on the same CPU.
4041 */
4042 iscsit_thread_check_cpumask(conn, current, 0);
4043
4044 memset(&iov, 0, sizeof(struct kvec));
4045
4046 iov.iov_base = buffer;
4047 iov.iov_len = ISCSI_HDR_LEN;
4048
4049 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4050 if (ret != ISCSI_HDR_LEN) {
4051 iscsit_rx_thread_wait_for_tcp(conn);
4052 break;
4053 }
4054
4055 hdr = (struct iscsi_hdr *) buffer;
4056 if (hdr->hlength) {
4057 iov.iov_len = hdr->hlength * 4;
4058 tmp_buf = krealloc(buffer,
4059 ISCSI_HDR_LEN + iov.iov_len,
4060 GFP_KERNEL);
4061 if (!tmp_buf)
4062 break;
4063
4064 buffer = tmp_buf;
4065 iov.iov_base = &buffer[ISCSI_HDR_LEN];
4066
4067 ret = rx_data(conn, &iov, 1, iov.iov_len);
4068 if (ret != iov.iov_len) {
4069 iscsit_rx_thread_wait_for_tcp(conn);
4070 break;
4071 }
4072 }
4073
4074 if (conn->conn_ops->HeaderDigest) {
4075 iov.iov_base = &digest;
4076 iov.iov_len = ISCSI_CRC_LEN;
4077
4078 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4079 if (ret != ISCSI_CRC_LEN) {
4080 iscsit_rx_thread_wait_for_tcp(conn);
4081 break;
4082 }
4083
4084 checksum = iscsit_crc_buf(buffer, ISCSI_HDR_LEN, 0,
4085 NULL);
4086 if (digest != checksum) {
4087 pr_err("HeaderDigest CRC32C failed,"
4088 " received 0x%08x, computed 0x%08x\n",
4089 digest, checksum);
4090 /*
4091 * Set the PDU to 0xff so it will intentionally
4092 * hit default in the switch below.
4093 */
4094 memset(buffer, 0xff, ISCSI_HDR_LEN);
4095 atomic_long_inc(&conn->sess->conn_digest_errors);
4096 } else {
4097 pr_debug("Got HeaderDigest CRC32C"
4098 " 0x%08x\n", checksum);
4099 }
4100 }
4101
4102 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4103 break;
4104
4105 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4106
4107 if (conn->sess->sess_ops->SessionType &&
4108 ((!(opcode & ISCSI_OP_TEXT)) ||
4109 (!(opcode & ISCSI_OP_LOGOUT)))) {
4110 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4111 " while in Discovery Session, rejecting.\n", opcode);
4112 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4113 buffer);
4114 break;
4115 }
4116
4117 ret = iscsi_target_rx_opcode(conn, buffer);
4118 if (ret < 0)
4119 break;
4120 }
4121
4122 kfree(buffer);
4123 }
4124
iscsi_target_rx_thread(void * arg)4125 int iscsi_target_rx_thread(void *arg)
4126 {
4127 int rc;
4128 struct iscsit_conn *conn = arg;
4129 bool conn_freed = false;
4130
4131 /*
4132 * Allow ourselves to be interrupted by SIGINT so that a
4133 * connection recovery / failure event can be triggered externally.
4134 */
4135 allow_signal(SIGINT);
4136 /*
4137 * Wait for iscsi_post_login_handler() to complete before allowing
4138 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4139 */
4140 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4141 if (rc < 0 || iscsi_target_check_conn_state(conn))
4142 goto out;
4143
4144 if (!conn->conn_transport->iscsit_get_rx_pdu)
4145 return 0;
4146
4147 conn->conn_transport->iscsit_get_rx_pdu(conn);
4148
4149 if (!signal_pending(current))
4150 atomic_set(&conn->transport_failed, 1);
4151 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4152
4153 out:
4154 if (!conn_freed) {
4155 while (!kthread_should_stop()) {
4156 msleep(100);
4157 }
4158 }
4159
4160 return 0;
4161 }
4162
iscsit_release_commands_from_conn(struct iscsit_conn * conn)4163 static void iscsit_release_commands_from_conn(struct iscsit_conn *conn)
4164 {
4165 LIST_HEAD(tmp_list);
4166 struct iscsit_cmd *cmd = NULL, *cmd_tmp = NULL;
4167 struct iscsit_session *sess = conn->sess;
4168 /*
4169 * We expect this function to only ever be called from either RX or TX
4170 * thread context via iscsit_close_connection() once the other context
4171 * has been reset -> returned sleeping pre-handler state.
4172 */
4173 spin_lock_bh(&conn->cmd_lock);
4174 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4175
4176 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4177 struct se_cmd *se_cmd = &cmd->se_cmd;
4178
4179 if (!se_cmd->se_tfo)
4180 continue;
4181
4182 spin_lock_irq(&se_cmd->t_state_lock);
4183 if (se_cmd->transport_state & CMD_T_ABORTED) {
4184 if (!(se_cmd->transport_state & CMD_T_TAS))
4185 /*
4186 * LIO's abort path owns the cleanup for this,
4187 * so put it back on the list and let
4188 * aborted_task handle it.
4189 */
4190 list_move_tail(&cmd->i_conn_node,
4191 &conn->conn_cmd_list);
4192 } else {
4193 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4194 }
4195
4196 if (cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
4197 /*
4198 * We never submitted the cmd to LIO core, so we have
4199 * to tell LIO to perform the completion process.
4200 */
4201 spin_unlock_irq(&se_cmd->t_state_lock);
4202 target_complete_cmd(&cmd->se_cmd, SAM_STAT_TASK_ABORTED);
4203 continue;
4204 }
4205 spin_unlock_irq(&se_cmd->t_state_lock);
4206 }
4207 spin_unlock_bh(&conn->cmd_lock);
4208
4209 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4210 list_del_init(&cmd->i_conn_node);
4211
4212 iscsit_increment_maxcmdsn(cmd, sess);
4213 iscsit_free_cmd(cmd, true);
4214
4215 }
4216
4217 /*
4218 * Wait on commands that were cleaned up via the aborted_task path.
4219 * LLDs that implement iscsit_wait_conn will already have waited for
4220 * commands.
4221 */
4222 if (!conn->conn_transport->iscsit_wait_conn) {
4223 target_stop_cmd_counter(conn->cmd_cnt);
4224 target_wait_for_cmds(conn->cmd_cnt);
4225 }
4226 }
4227
iscsit_stop_timers_for_cmds(struct iscsit_conn * conn)4228 static void iscsit_stop_timers_for_cmds(
4229 struct iscsit_conn *conn)
4230 {
4231 struct iscsit_cmd *cmd;
4232
4233 spin_lock_bh(&conn->cmd_lock);
4234 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4235 if (cmd->data_direction == DMA_TO_DEVICE)
4236 iscsit_stop_dataout_timer(cmd);
4237 }
4238 spin_unlock_bh(&conn->cmd_lock);
4239 }
4240
iscsit_close_connection(struct iscsit_conn * conn)4241 int iscsit_close_connection(
4242 struct iscsit_conn *conn)
4243 {
4244 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4245 struct iscsit_session *sess = conn->sess;
4246
4247 pr_debug("Closing iSCSI connection CID %hu on SID:"
4248 " %u\n", conn->cid, sess->sid);
4249 /*
4250 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4251 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4252 * sleeping and the logout response never got sent because the
4253 * connection failed.
4254 *
4255 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4256 * to signal logout response TX interrupt completion. Go ahead and skip
4257 * this for iser since isert_rx_opcode() does not wait on logout failure,
4258 * and to avoid iscsit_conn pointer dereference in iser-target code.
4259 */
4260 if (!conn->conn_transport->rdma_shutdown)
4261 complete(&conn->conn_logout_comp);
4262
4263 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4264 if (conn->tx_thread &&
4265 cmpxchg(&conn->tx_thread_active, true, false)) {
4266 send_sig(SIGINT, conn->tx_thread, 1);
4267 kthread_stop(conn->tx_thread);
4268 }
4269 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4270 if (conn->rx_thread &&
4271 cmpxchg(&conn->rx_thread_active, true, false)) {
4272 send_sig(SIGINT, conn->rx_thread, 1);
4273 kthread_stop(conn->rx_thread);
4274 }
4275 }
4276
4277 spin_lock(&iscsit_global->ts_bitmap_lock);
4278 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4279 get_order(1));
4280 spin_unlock(&iscsit_global->ts_bitmap_lock);
4281
4282 iscsit_stop_timers_for_cmds(conn);
4283 iscsit_stop_nopin_timer(conn);
4284 iscsit_stop_nopin_response_timer(conn);
4285
4286 if (conn->conn_transport->iscsit_wait_conn)
4287 conn->conn_transport->iscsit_wait_conn(conn);
4288
4289 /*
4290 * During Connection recovery drop unacknowledged out of order
4291 * commands for this connection, and prepare the other commands
4292 * for reallegiance.
4293 *
4294 * During normal operation clear the out of order commands (but
4295 * do not free the struct iscsi_ooo_cmdsn's) and release all
4296 * struct iscsit_cmds.
4297 */
4298 if (atomic_read(&conn->connection_recovery)) {
4299 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4300 iscsit_prepare_cmds_for_reallegiance(conn);
4301 } else {
4302 iscsit_clear_ooo_cmdsns_for_conn(conn);
4303 iscsit_release_commands_from_conn(conn);
4304 }
4305 iscsit_free_queue_reqs_for_conn(conn);
4306
4307 /*
4308 * Handle decrementing session or connection usage count if
4309 * a logout response was not able to be sent because the
4310 * connection failed. Fall back to Session Recovery here.
4311 */
4312 if (atomic_read(&conn->conn_logout_remove)) {
4313 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4314 iscsit_dec_conn_usage_count(conn);
4315 iscsit_dec_session_usage_count(sess);
4316 }
4317 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4318 iscsit_dec_conn_usage_count(conn);
4319
4320 atomic_set(&conn->conn_logout_remove, 0);
4321 atomic_set(&sess->session_reinstatement, 0);
4322 atomic_set(&sess->session_fall_back_to_erl0, 1);
4323 }
4324
4325 spin_lock_bh(&sess->conn_lock);
4326 list_del(&conn->conn_list);
4327
4328 /*
4329 * Attempt to let the Initiator know this connection failed by
4330 * sending an Connection Dropped Async Message on another
4331 * active connection.
4332 */
4333 if (atomic_read(&conn->connection_recovery))
4334 iscsit_build_conn_drop_async_message(conn);
4335
4336 spin_unlock_bh(&sess->conn_lock);
4337
4338 /*
4339 * If connection reinstatement is being performed on this connection,
4340 * up the connection reinstatement semaphore that is being blocked on
4341 * in iscsit_cause_connection_reinstatement().
4342 */
4343 spin_lock_bh(&conn->state_lock);
4344 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4345 spin_unlock_bh(&conn->state_lock);
4346 complete(&conn->conn_wait_comp);
4347 wait_for_completion(&conn->conn_post_wait_comp);
4348 spin_lock_bh(&conn->state_lock);
4349 }
4350
4351 /*
4352 * If connection reinstatement is being performed on this connection
4353 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4354 * connection wait rcfr semaphore that is being blocked on
4355 * an iscsit_connection_reinstatement_rcfr().
4356 */
4357 if (atomic_read(&conn->connection_wait_rcfr)) {
4358 spin_unlock_bh(&conn->state_lock);
4359 complete(&conn->conn_wait_rcfr_comp);
4360 wait_for_completion(&conn->conn_post_wait_comp);
4361 spin_lock_bh(&conn->state_lock);
4362 }
4363 atomic_set(&conn->connection_reinstatement, 1);
4364 spin_unlock_bh(&conn->state_lock);
4365
4366 /*
4367 * If any other processes are accessing this connection pointer we
4368 * must wait until they have completed.
4369 */
4370 iscsit_check_conn_usage_count(conn);
4371
4372 if (conn->sock)
4373 sock_release(conn->sock);
4374
4375 if (conn->conn_transport->iscsit_free_conn)
4376 conn->conn_transport->iscsit_free_conn(conn);
4377
4378 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4379 conn->conn_state = TARG_CONN_STATE_FREE;
4380 iscsit_free_conn(conn);
4381
4382 spin_lock_bh(&sess->conn_lock);
4383 atomic_dec(&sess->nconn);
4384 pr_debug("Decremented iSCSI connection count to %d from node:"
4385 " %s\n", atomic_read(&sess->nconn),
4386 sess->sess_ops->InitiatorName);
4387 /*
4388 * Make sure that if one connection fails in an non ERL=2 iSCSI
4389 * Session that they all fail.
4390 */
4391 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4392 !atomic_read(&sess->session_logout))
4393 atomic_set(&sess->session_fall_back_to_erl0, 1);
4394
4395 /*
4396 * If this was not the last connection in the session, and we are
4397 * performing session reinstatement or falling back to ERL=0, call
4398 * iscsit_stop_session() without sleeping to shutdown the other
4399 * active connections.
4400 */
4401 if (atomic_read(&sess->nconn)) {
4402 if (!atomic_read(&sess->session_reinstatement) &&
4403 !atomic_read(&sess->session_fall_back_to_erl0)) {
4404 spin_unlock_bh(&sess->conn_lock);
4405 return 0;
4406 }
4407 if (!atomic_read(&sess->session_stop_active)) {
4408 atomic_set(&sess->session_stop_active, 1);
4409 spin_unlock_bh(&sess->conn_lock);
4410 iscsit_stop_session(sess, 0, 0);
4411 return 0;
4412 }
4413 spin_unlock_bh(&sess->conn_lock);
4414 return 0;
4415 }
4416
4417 /*
4418 * If this was the last connection in the session and one of the
4419 * following is occurring:
4420 *
4421 * Session Reinstatement is not being performed, and are falling back
4422 * to ERL=0 call iscsit_close_session().
4423 *
4424 * Session Logout was requested. iscsit_close_session() will be called
4425 * elsewhere.
4426 *
4427 * Session Continuation is not being performed, start the Time2Retain
4428 * handler and check if sleep_on_sess_wait_sem is active.
4429 */
4430 if (!atomic_read(&sess->session_reinstatement) &&
4431 atomic_read(&sess->session_fall_back_to_erl0)) {
4432 spin_unlock_bh(&sess->conn_lock);
4433 complete_all(&sess->session_wait_comp);
4434 iscsit_close_session(sess, true);
4435
4436 return 0;
4437 } else if (atomic_read(&sess->session_logout)) {
4438 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4439 sess->session_state = TARG_SESS_STATE_FREE;
4440
4441 if (atomic_read(&sess->session_close)) {
4442 spin_unlock_bh(&sess->conn_lock);
4443 complete_all(&sess->session_wait_comp);
4444 iscsit_close_session(sess, true);
4445 } else {
4446 spin_unlock_bh(&sess->conn_lock);
4447 }
4448
4449 return 0;
4450 } else {
4451 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4452 sess->session_state = TARG_SESS_STATE_FAILED;
4453
4454 if (!atomic_read(&sess->session_continuation))
4455 iscsit_start_time2retain_handler(sess);
4456
4457 if (atomic_read(&sess->session_close)) {
4458 spin_unlock_bh(&sess->conn_lock);
4459 complete_all(&sess->session_wait_comp);
4460 iscsit_close_session(sess, true);
4461 } else {
4462 spin_unlock_bh(&sess->conn_lock);
4463 }
4464
4465 return 0;
4466 }
4467 }
4468
4469 /*
4470 * If the iSCSI Session for the iSCSI Initiator Node exists,
4471 * forcefully shutdown the iSCSI NEXUS.
4472 */
iscsit_close_session(struct iscsit_session * sess,bool can_sleep)4473 int iscsit_close_session(struct iscsit_session *sess, bool can_sleep)
4474 {
4475 struct iscsi_portal_group *tpg = sess->tpg;
4476 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4477
4478 if (atomic_read(&sess->nconn)) {
4479 pr_err("%d connection(s) still exist for iSCSI session"
4480 " to %s\n", atomic_read(&sess->nconn),
4481 sess->sess_ops->InitiatorName);
4482 BUG();
4483 }
4484
4485 spin_lock_bh(&se_tpg->session_lock);
4486 atomic_set(&sess->session_logout, 1);
4487 atomic_set(&sess->session_reinstatement, 1);
4488 iscsit_stop_time2retain_timer(sess);
4489 spin_unlock_bh(&se_tpg->session_lock);
4490
4491 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4492 iscsit_free_connection_recovery_entries(sess);
4493
4494 /*
4495 * transport_deregister_session_configfs() will clear the
4496 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4497 * can be setting it again with __transport_register_session() in
4498 * iscsi_post_login_handler() again after the iscsit_stop_session()
4499 * completes in iscsi_np context.
4500 */
4501 transport_deregister_session_configfs(sess->se_sess);
4502
4503 /*
4504 * If any other processes are accessing this session pointer we must
4505 * wait until they have completed. If we are in an interrupt (the
4506 * time2retain handler) and contain and active session usage count we
4507 * restart the timer and exit.
4508 */
4509 if (iscsit_check_session_usage_count(sess, can_sleep)) {
4510 atomic_set(&sess->session_logout, 0);
4511 iscsit_start_time2retain_handler(sess);
4512 return 0;
4513 }
4514
4515 transport_deregister_session(sess->se_sess);
4516
4517 iscsit_free_all_ooo_cmdsns(sess);
4518
4519 spin_lock_bh(&se_tpg->session_lock);
4520 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4521 sess->session_state = TARG_SESS_STATE_FREE;
4522 pr_debug("Released iSCSI session from node: %s\n",
4523 sess->sess_ops->InitiatorName);
4524 tpg->nsessions--;
4525 if (tpg->tpg_tiqn)
4526 tpg->tpg_tiqn->tiqn_nsessions--;
4527
4528 pr_debug("Decremented number of active iSCSI Sessions on"
4529 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4530
4531 ida_free(&sess_ida, sess->session_index);
4532 kfree(sess->sess_ops);
4533 sess->sess_ops = NULL;
4534 spin_unlock_bh(&se_tpg->session_lock);
4535
4536 kfree(sess);
4537 return 0;
4538 }
4539
iscsit_logout_post_handler_closesession(struct iscsit_conn * conn)4540 static void iscsit_logout_post_handler_closesession(
4541 struct iscsit_conn *conn)
4542 {
4543 struct iscsit_session *sess = conn->sess;
4544 int sleep = 1;
4545 /*
4546 * Traditional iscsi/tcp will invoke this logic from TX thread
4547 * context during session logout, so clear tx_thread_active and
4548 * sleep if iscsit_close_connection() has not already occured.
4549 *
4550 * Since iser-target invokes this logic from it's own workqueue,
4551 * always sleep waiting for RX/TX thread shutdown to complete
4552 * within iscsit_close_connection().
4553 */
4554 if (!conn->conn_transport->rdma_shutdown) {
4555 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4556 if (!sleep)
4557 return;
4558 }
4559
4560 atomic_set(&conn->conn_logout_remove, 0);
4561 complete(&conn->conn_logout_comp);
4562
4563 iscsit_dec_conn_usage_count(conn);
4564 atomic_set(&sess->session_close, 1);
4565 iscsit_stop_session(sess, sleep, sleep);
4566 iscsit_dec_session_usage_count(sess);
4567 }
4568
iscsit_logout_post_handler_samecid(struct iscsit_conn * conn)4569 static void iscsit_logout_post_handler_samecid(
4570 struct iscsit_conn *conn)
4571 {
4572 int sleep = 1;
4573
4574 if (!conn->conn_transport->rdma_shutdown) {
4575 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4576 if (!sleep)
4577 return;
4578 }
4579
4580 atomic_set(&conn->conn_logout_remove, 0);
4581 complete(&conn->conn_logout_comp);
4582
4583 iscsit_cause_connection_reinstatement(conn, sleep);
4584 iscsit_dec_conn_usage_count(conn);
4585 }
4586
iscsit_logout_post_handler_diffcid(struct iscsit_conn * conn,u16 cid)4587 static void iscsit_logout_post_handler_diffcid(
4588 struct iscsit_conn *conn,
4589 u16 cid)
4590 {
4591 struct iscsit_conn *l_conn;
4592 struct iscsit_session *sess = conn->sess;
4593 bool conn_found = false;
4594
4595 if (!sess)
4596 return;
4597
4598 spin_lock_bh(&sess->conn_lock);
4599 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4600 if (l_conn->cid == cid) {
4601 iscsit_inc_conn_usage_count(l_conn);
4602 conn_found = true;
4603 break;
4604 }
4605 }
4606 spin_unlock_bh(&sess->conn_lock);
4607
4608 if (!conn_found)
4609 return;
4610
4611 if (l_conn->sock)
4612 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4613
4614 spin_lock_bh(&l_conn->state_lock);
4615 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4616 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4617 spin_unlock_bh(&l_conn->state_lock);
4618
4619 iscsit_cause_connection_reinstatement(l_conn, 1);
4620 iscsit_dec_conn_usage_count(l_conn);
4621 }
4622
4623 /*
4624 * Return of 0 causes the TX thread to restart.
4625 */
iscsit_logout_post_handler(struct iscsit_cmd * cmd,struct iscsit_conn * conn)4626 int iscsit_logout_post_handler(
4627 struct iscsit_cmd *cmd,
4628 struct iscsit_conn *conn)
4629 {
4630 int ret = 0;
4631
4632 switch (cmd->logout_reason) {
4633 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4634 switch (cmd->logout_response) {
4635 case ISCSI_LOGOUT_SUCCESS:
4636 case ISCSI_LOGOUT_CLEANUP_FAILED:
4637 default:
4638 iscsit_logout_post_handler_closesession(conn);
4639 break;
4640 }
4641 break;
4642 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4643 if (conn->cid == cmd->logout_cid) {
4644 switch (cmd->logout_response) {
4645 case ISCSI_LOGOUT_SUCCESS:
4646 case ISCSI_LOGOUT_CLEANUP_FAILED:
4647 default:
4648 iscsit_logout_post_handler_samecid(conn);
4649 break;
4650 }
4651 } else {
4652 switch (cmd->logout_response) {
4653 case ISCSI_LOGOUT_SUCCESS:
4654 iscsit_logout_post_handler_diffcid(conn,
4655 cmd->logout_cid);
4656 break;
4657 case ISCSI_LOGOUT_CID_NOT_FOUND:
4658 case ISCSI_LOGOUT_CLEANUP_FAILED:
4659 default:
4660 break;
4661 }
4662 ret = 1;
4663 }
4664 break;
4665 case ISCSI_LOGOUT_REASON_RECOVERY:
4666 switch (cmd->logout_response) {
4667 case ISCSI_LOGOUT_SUCCESS:
4668 case ISCSI_LOGOUT_CID_NOT_FOUND:
4669 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4670 case ISCSI_LOGOUT_CLEANUP_FAILED:
4671 default:
4672 break;
4673 }
4674 ret = 1;
4675 break;
4676 default:
4677 break;
4678
4679 }
4680 return ret;
4681 }
4682 EXPORT_SYMBOL(iscsit_logout_post_handler);
4683
iscsit_stop_session(struct iscsit_session * sess,int session_sleep,int connection_sleep)4684 void iscsit_stop_session(
4685 struct iscsit_session *sess,
4686 int session_sleep,
4687 int connection_sleep)
4688 {
4689 u16 conn_count = atomic_read(&sess->nconn);
4690 struct iscsit_conn *conn, *conn_tmp = NULL;
4691 int is_last;
4692
4693 spin_lock_bh(&sess->conn_lock);
4694
4695 if (connection_sleep) {
4696 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4697 conn_list) {
4698 if (conn_count == 0)
4699 break;
4700
4701 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4702 is_last = 1;
4703 } else {
4704 iscsit_inc_conn_usage_count(conn_tmp);
4705 is_last = 0;
4706 }
4707 iscsit_inc_conn_usage_count(conn);
4708
4709 spin_unlock_bh(&sess->conn_lock);
4710 iscsit_cause_connection_reinstatement(conn, 1);
4711 spin_lock_bh(&sess->conn_lock);
4712
4713 iscsit_dec_conn_usage_count(conn);
4714 if (is_last == 0)
4715 iscsit_dec_conn_usage_count(conn_tmp);
4716 conn_count--;
4717 }
4718 } else {
4719 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4720 iscsit_cause_connection_reinstatement(conn, 0);
4721 }
4722
4723 if (session_sleep && atomic_read(&sess->nconn)) {
4724 spin_unlock_bh(&sess->conn_lock);
4725 wait_for_completion(&sess->session_wait_comp);
4726 } else
4727 spin_unlock_bh(&sess->conn_lock);
4728 }
4729
iscsit_release_sessions_for_tpg(struct iscsi_portal_group * tpg,int force)4730 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4731 {
4732 struct iscsit_session *sess;
4733 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4734 struct se_session *se_sess, *se_sess_tmp;
4735 LIST_HEAD(free_list);
4736 int session_count = 0;
4737
4738 spin_lock_bh(&se_tpg->session_lock);
4739 if (tpg->nsessions && !force) {
4740 spin_unlock_bh(&se_tpg->session_lock);
4741 return -1;
4742 }
4743
4744 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4745 sess_list) {
4746 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr;
4747
4748 spin_lock(&sess->conn_lock);
4749 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4750 atomic_read(&sess->session_logout) ||
4751 atomic_read(&sess->session_close) ||
4752 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4753 spin_unlock(&sess->conn_lock);
4754 continue;
4755 }
4756 iscsit_inc_session_usage_count(sess);
4757 atomic_set(&sess->session_reinstatement, 1);
4758 atomic_set(&sess->session_fall_back_to_erl0, 1);
4759 atomic_set(&sess->session_close, 1);
4760 spin_unlock(&sess->conn_lock);
4761
4762 list_move_tail(&se_sess->sess_list, &free_list);
4763 }
4764 spin_unlock_bh(&se_tpg->session_lock);
4765
4766 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4767 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr;
4768
4769 list_del_init(&se_sess->sess_list);
4770 iscsit_stop_session(sess, 1, 1);
4771 iscsit_dec_session_usage_count(sess);
4772 session_count++;
4773 }
4774
4775 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4776 " Group: %hu\n", session_count, tpg->tpgt);
4777 return 0;
4778 }
4779
4780 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4781 MODULE_VERSION("4.1.x");
4782 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4783 MODULE_LICENSE("GPL");
4784
4785 module_init(iscsi_target_init_module);
4786 module_exit(iscsi_target_cleanup_module);
4787