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 target_complete_cmd(se_cmd, SAM_STAT_TASK_ABORTED);
1539 }
1540
1541 return iscsit_dump_data_payload(conn, payload_length, 1);
1542 }
1543 }
1544 /*
1545 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1546 * within-command recovery checks before receiving the payload.
1547 */
1548 rc = iscsit_check_pre_dataout(cmd, buf);
1549 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1550 return 0;
1551 else if (rc == DATAOUT_CANNOT_RECOVER)
1552 return -1;
1553 *success = true;
1554 return 0;
1555 }
1556 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1557
1558 int
iscsit_check_dataout_hdr(struct iscsit_conn * conn,void * buf,struct iscsit_cmd ** out_cmd)1559 iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf,
1560 struct iscsit_cmd **out_cmd)
1561 {
1562 struct iscsi_data *hdr = buf;
1563 struct iscsit_cmd *cmd;
1564 u32 payload_length = ntoh24(hdr->dlength);
1565 int rc;
1566 bool success = false;
1567
1568 if (!payload_length) {
1569 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1570 return 0;
1571 }
1572
1573 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1574 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1575 " MaxXmitDataSegmentLength: %u\n", payload_length,
1576 conn->conn_ops->MaxXmitDataSegmentLength);
1577 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1578 }
1579
1580 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1581 if (!cmd)
1582 return 0;
1583
1584 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1585
1586 if (success)
1587 *out_cmd = cmd;
1588
1589 return rc;
1590 }
1591 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1592
1593 static int
iscsit_get_dataout(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_data * hdr)1594 iscsit_get_dataout(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1595 struct iscsi_data *hdr)
1596 {
1597 struct kvec *iov;
1598 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1599 u32 payload_length;
1600 int iov_ret, data_crc_failed = 0;
1601
1602 payload_length = min_t(u32, cmd->se_cmd.data_length,
1603 ntoh24(hdr->dlength));
1604 rx_size += payload_length;
1605 iov = &cmd->iov_data[0];
1606
1607 iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2,
1608 be32_to_cpu(hdr->offset), payload_length);
1609 if (iov_ret < 0)
1610 return -1;
1611
1612 iov_count += iov_ret;
1613
1614 padding = ((-payload_length) & 3);
1615 if (padding != 0) {
1616 iov[iov_count].iov_base = cmd->pad_bytes;
1617 iov[iov_count++].iov_len = padding;
1618 rx_size += padding;
1619 pr_debug("Receiving %u padding bytes.\n", padding);
1620 }
1621
1622 if (conn->conn_ops->DataDigest) {
1623 iov[iov_count].iov_base = &checksum;
1624 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1625 rx_size += ISCSI_CRC_LEN;
1626 }
1627
1628 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
1629 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1630
1631 iscsit_unmap_iovec(cmd);
1632
1633 if (rx_got != rx_size)
1634 return -1;
1635
1636 if (conn->conn_ops->DataDigest) {
1637 u32 data_crc;
1638
1639 data_crc = iscsit_crc_sglist(cmd, payload_length, padding,
1640 cmd->pad_bytes);
1641 if (checksum != data_crc) {
1642 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1643 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1644 " does not match computed 0x%08x\n",
1645 hdr->itt, hdr->offset, payload_length,
1646 hdr->datasn, checksum, data_crc);
1647 data_crc_failed = 1;
1648 } else {
1649 pr_debug("Got CRC32C DataDigest 0x%08x for"
1650 " %u bytes of Data Out\n", checksum,
1651 payload_length);
1652 }
1653 }
1654
1655 return data_crc_failed;
1656 }
1657
1658 int
iscsit_check_dataout_payload(struct iscsit_cmd * cmd,struct iscsi_data * hdr,bool data_crc_failed)1659 iscsit_check_dataout_payload(struct iscsit_cmd *cmd, struct iscsi_data *hdr,
1660 bool data_crc_failed)
1661 {
1662 struct iscsit_conn *conn = cmd->conn;
1663 int rc, ooo_cmdsn;
1664 /*
1665 * Increment post receive data and CRC values or perform
1666 * within-command recovery.
1667 */
1668 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1669 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1670 return 0;
1671 else if (rc == DATAOUT_SEND_R2T) {
1672 iscsit_set_dataout_sequence_values(cmd);
1673 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1674 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1675 /*
1676 * Handle extra special case for out of order
1677 * Unsolicited Data Out.
1678 */
1679 spin_lock_bh(&cmd->istate_lock);
1680 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1681 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1682 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1683 spin_unlock_bh(&cmd->istate_lock);
1684
1685 iscsit_stop_dataout_timer(cmd);
1686 if (ooo_cmdsn)
1687 return 0;
1688 target_execute_cmd(&cmd->se_cmd);
1689 return 0;
1690 } else /* DATAOUT_CANNOT_RECOVER */
1691 return -1;
1692
1693 return 0;
1694 }
1695 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1696
iscsit_handle_data_out(struct iscsit_conn * conn,unsigned char * buf)1697 static int iscsit_handle_data_out(struct iscsit_conn *conn, unsigned char *buf)
1698 {
1699 struct iscsit_cmd *cmd = NULL;
1700 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1701 int rc;
1702 bool data_crc_failed = false;
1703
1704 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1705 if (rc < 0)
1706 return 0;
1707 else if (!cmd)
1708 return 0;
1709
1710 rc = iscsit_get_dataout(conn, cmd, hdr);
1711 if (rc < 0)
1712 return rc;
1713 else if (rc > 0)
1714 data_crc_failed = true;
1715
1716 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1717 }
1718
iscsit_setup_nop_out(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_nopout * hdr)1719 int iscsit_setup_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1720 struct iscsi_nopout *hdr)
1721 {
1722 u32 payload_length = ntoh24(hdr->dlength);
1723
1724 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1725 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1726 if (!cmd)
1727 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1728 (unsigned char *)hdr);
1729
1730 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1731 (unsigned char *)hdr);
1732 }
1733
1734 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1735 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1736 " not set, protocol error.\n");
1737 if (!cmd)
1738 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1739 (unsigned char *)hdr);
1740
1741 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1742 (unsigned char *)hdr);
1743 }
1744
1745 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1746 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1747 " greater than MaxXmitDataSegmentLength: %u, protocol"
1748 " error.\n", payload_length,
1749 conn->conn_ops->MaxXmitDataSegmentLength);
1750 if (!cmd)
1751 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1752 (unsigned char *)hdr);
1753
1754 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1755 (unsigned char *)hdr);
1756 }
1757
1758 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1759 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1760 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1761 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1762 payload_length);
1763 /*
1764 * This is not a response to a Unsolicited NopIN, which means
1765 * it can either be a NOPOUT ping request (with a valid ITT),
1766 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1767 * Either way, make sure we allocate an struct iscsit_cmd, as both
1768 * can contain ping data.
1769 */
1770 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1771 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1772 cmd->i_state = ISTATE_SEND_NOPIN;
1773 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1774 1 : 0);
1775 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1776 cmd->targ_xfer_tag = 0xFFFFFFFF;
1777 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1778 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1779 cmd->data_direction = DMA_NONE;
1780 }
1781
1782 return 0;
1783 }
1784 EXPORT_SYMBOL(iscsit_setup_nop_out);
1785
iscsit_process_nop_out(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_nopout * hdr)1786 int iscsit_process_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1787 struct iscsi_nopout *hdr)
1788 {
1789 struct iscsit_cmd *cmd_p = NULL;
1790 int cmdsn_ret = 0;
1791 /*
1792 * Initiator is expecting a NopIN ping reply..
1793 */
1794 if (hdr->itt != RESERVED_ITT) {
1795 if (!cmd)
1796 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1797 (unsigned char *)hdr);
1798
1799 spin_lock_bh(&conn->cmd_lock);
1800 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1801 spin_unlock_bh(&conn->cmd_lock);
1802
1803 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1804
1805 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1806 iscsit_add_cmd_to_response_queue(cmd, conn,
1807 cmd->i_state);
1808 return 0;
1809 }
1810
1811 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1812 (unsigned char *)hdr, hdr->cmdsn);
1813 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1814 return 0;
1815 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1816 return -1;
1817
1818 return 0;
1819 }
1820 /*
1821 * This was a response to a unsolicited NOPIN ping.
1822 */
1823 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1824 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1825 if (!cmd_p)
1826 return -EINVAL;
1827
1828 iscsit_stop_nopin_response_timer(conn);
1829
1830 cmd_p->i_state = ISTATE_REMOVE;
1831 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1832
1833 iscsit_start_nopin_timer(conn);
1834 return 0;
1835 }
1836 /*
1837 * Otherwise, initiator is not expecting a NOPIN is response.
1838 * Just ignore for now.
1839 */
1840
1841 if (cmd)
1842 iscsit_free_cmd(cmd, false);
1843
1844 return 0;
1845 }
1846 EXPORT_SYMBOL(iscsit_process_nop_out);
1847
iscsit_handle_nop_out(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)1848 static int iscsit_handle_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1849 unsigned char *buf)
1850 {
1851 unsigned char *ping_data = NULL;
1852 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1853 struct kvec *iov = NULL;
1854 u32 payload_length = ntoh24(hdr->dlength);
1855 int ret;
1856
1857 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1858 if (ret < 0)
1859 return 0;
1860 /*
1861 * Handle NOP-OUT payload for traditional iSCSI sockets
1862 */
1863 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1864 u32 checksum, data_crc, padding = 0;
1865 int niov = 0, rx_got, rx_size = payload_length;
1866
1867 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1868 if (!ping_data) {
1869 ret = -1;
1870 goto out;
1871 }
1872
1873 iov = &cmd->iov_misc[0];
1874 iov[niov].iov_base = ping_data;
1875 iov[niov++].iov_len = payload_length;
1876
1877 padding = ((-payload_length) & 3);
1878 if (padding != 0) {
1879 pr_debug("Receiving %u additional bytes"
1880 " for padding.\n", padding);
1881 iov[niov].iov_base = &cmd->pad_bytes;
1882 iov[niov++].iov_len = padding;
1883 rx_size += padding;
1884 }
1885 if (conn->conn_ops->DataDigest) {
1886 iov[niov].iov_base = &checksum;
1887 iov[niov++].iov_len = ISCSI_CRC_LEN;
1888 rx_size += ISCSI_CRC_LEN;
1889 }
1890
1891 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc));
1892 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1893 if (rx_got != rx_size) {
1894 ret = -1;
1895 goto out;
1896 }
1897
1898 if (conn->conn_ops->DataDigest) {
1899 data_crc = iscsit_crc_buf(ping_data, payload_length,
1900 padding, cmd->pad_bytes);
1901 if (checksum != data_crc) {
1902 pr_err("Ping data CRC32C DataDigest"
1903 " 0x%08x does not match computed 0x%08x\n",
1904 checksum, data_crc);
1905 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1906 pr_err("Unable to recover from"
1907 " NOPOUT Ping DataCRC failure while in"
1908 " ERL=0.\n");
1909 ret = -1;
1910 goto out;
1911 } else {
1912 /*
1913 * Silently drop this PDU and let the
1914 * initiator plug the CmdSN gap.
1915 */
1916 pr_debug("Dropping NOPOUT"
1917 " Command CmdSN: 0x%08x due to"
1918 " DataCRC error.\n", hdr->cmdsn);
1919 ret = 0;
1920 goto out;
1921 }
1922 } else {
1923 pr_debug("Got CRC32C DataDigest"
1924 " 0x%08x for %u bytes of ping data.\n",
1925 checksum, payload_length);
1926 }
1927 }
1928
1929 ping_data[payload_length] = '\0';
1930 /*
1931 * Attach ping data to struct iscsit_cmd->buf_ptr.
1932 */
1933 cmd->buf_ptr = ping_data;
1934 cmd->buf_ptr_size = payload_length;
1935
1936 pr_debug("Got %u bytes of NOPOUT ping"
1937 " data.\n", payload_length);
1938 pr_debug("Ping Data: \"%s\"\n", ping_data);
1939 }
1940
1941 return iscsit_process_nop_out(conn, cmd, hdr);
1942 out:
1943 if (cmd)
1944 iscsit_free_cmd(cmd, false);
1945
1946 kfree(ping_data);
1947 return ret;
1948 }
1949
iscsit_convert_tmf(u8 iscsi_tmf)1950 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1951 {
1952 switch (iscsi_tmf) {
1953 case ISCSI_TM_FUNC_ABORT_TASK:
1954 return TMR_ABORT_TASK;
1955 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1956 return TMR_ABORT_TASK_SET;
1957 case ISCSI_TM_FUNC_CLEAR_ACA:
1958 return TMR_CLEAR_ACA;
1959 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1960 return TMR_CLEAR_TASK_SET;
1961 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1962 return TMR_LUN_RESET;
1963 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1964 return TMR_TARGET_WARM_RESET;
1965 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1966 return TMR_TARGET_COLD_RESET;
1967 default:
1968 return TMR_UNKNOWN;
1969 }
1970 }
1971
1972 int
iscsit_handle_task_mgt_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)1973 iscsit_handle_task_mgt_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1974 unsigned char *buf)
1975 {
1976 struct se_tmr_req *se_tmr;
1977 struct iscsi_tmr_req *tmr_req;
1978 struct iscsi_tm *hdr;
1979 int out_of_order_cmdsn = 0, ret;
1980 u8 function, tcm_function = TMR_UNKNOWN;
1981
1982 hdr = (struct iscsi_tm *) buf;
1983 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1984 function = hdr->flags;
1985
1986 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1987 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1988 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1989 hdr->rtt, hdr->refcmdsn, conn->cid);
1990
1991 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1992 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1993 hdr->rtt != RESERVED_ITT)) {
1994 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1995 hdr->rtt = RESERVED_ITT;
1996 }
1997
1998 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1999 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2000 pr_err("Task Management Request TASK_REASSIGN not"
2001 " issued as immediate command, bad iSCSI Initiator"
2002 "implementation\n");
2003 return iscsit_add_reject_cmd(cmd,
2004 ISCSI_REASON_PROTOCOL_ERROR, buf);
2005 }
2006 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2007 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
2008 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
2009
2010 cmd->data_direction = DMA_NONE;
2011 cmd->tmr_req = kzalloc_obj(*cmd->tmr_req);
2012 if (!cmd->tmr_req) {
2013 return iscsit_add_reject_cmd(cmd,
2014 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2015 buf);
2016 }
2017
2018 __target_init_cmd(&cmd->se_cmd, &iscsi_ops,
2019 conn->sess->se_sess, 0, DMA_NONE,
2020 TCM_SIMPLE_TAG, cmd->sense_buffer + 2,
2021 scsilun_to_int(&hdr->lun),
2022 conn->cmd_cnt);
2023
2024 target_get_sess_cmd(&cmd->se_cmd, true);
2025
2026 /*
2027 * TASK_REASSIGN for ERL=2 / connection stays inside of
2028 * LIO-Target $FABRIC_MOD
2029 */
2030 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2031 tcm_function = iscsit_convert_tmf(function);
2032 if (tcm_function == TMR_UNKNOWN) {
2033 pr_err("Unknown iSCSI TMR Function:"
2034 " 0x%02x\n", function);
2035 return iscsit_add_reject_cmd(cmd,
2036 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2037 }
2038 }
2039 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2040 GFP_KERNEL);
2041 if (ret < 0)
2042 return iscsit_add_reject_cmd(cmd,
2043 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2044
2045 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2046
2047 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2048 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2049 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2050 cmd->init_task_tag = hdr->itt;
2051 cmd->targ_xfer_tag = 0xFFFFFFFF;
2052 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2053 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2054 se_tmr = cmd->se_cmd.se_tmr_req;
2055 tmr_req = cmd->tmr_req;
2056 /*
2057 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2058 */
2059 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2060 ret = transport_lookup_tmr_lun(&cmd->se_cmd);
2061 if (ret < 0) {
2062 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2063 goto attach;
2064 }
2065 }
2066
2067 switch (function) {
2068 case ISCSI_TM_FUNC_ABORT_TASK:
2069 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2070 if (se_tmr->response)
2071 goto attach;
2072 break;
2073 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2074 case ISCSI_TM_FUNC_CLEAR_ACA:
2075 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2076 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2077 break;
2078 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2079 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2080 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2081 goto attach;
2082 }
2083 break;
2084 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2085 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2086 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2087 goto attach;
2088 }
2089 break;
2090 case ISCSI_TM_FUNC_TASK_REASSIGN:
2091 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2092 /*
2093 * Perform sanity checks on the ExpDataSN only if the
2094 * TASK_REASSIGN was successful.
2095 */
2096 if (se_tmr->response)
2097 break;
2098
2099 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2100 return iscsit_add_reject_cmd(cmd,
2101 ISCSI_REASON_BOOKMARK_INVALID, buf);
2102 break;
2103 default:
2104 pr_err("Unknown TMR function: 0x%02x, protocol"
2105 " error.\n", function);
2106 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2107 goto attach;
2108 }
2109
2110 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2111 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2112 se_tmr->call_transport = 1;
2113 attach:
2114 spin_lock_bh(&conn->cmd_lock);
2115 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2116 spin_unlock_bh(&conn->cmd_lock);
2117
2118 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2119 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2120 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2121 out_of_order_cmdsn = 1;
2122 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2123 target_put_sess_cmd(&cmd->se_cmd);
2124 return 0;
2125 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2126 return -1;
2127 }
2128 }
2129 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2130
2131 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2132 return 0;
2133 /*
2134 * Found the referenced task, send to transport for processing.
2135 */
2136 if (se_tmr->call_transport)
2137 return transport_generic_handle_tmr(&cmd->se_cmd);
2138
2139 /*
2140 * Could not find the referenced LUN, task, or Task Management
2141 * command not authorized or supported. Change state and
2142 * let the tx_thread send the response.
2143 *
2144 * For connection recovery, this is also the default action for
2145 * TMR TASK_REASSIGN.
2146 */
2147 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2148 target_put_sess_cmd(&cmd->se_cmd);
2149 return 0;
2150 }
2151 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2152
2153 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2154 int
iscsit_setup_text_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_text * hdr)2155 iscsit_setup_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2156 struct iscsi_text *hdr)
2157 {
2158 u32 payload_length = ntoh24(hdr->dlength);
2159
2160 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2161 pr_err("Unable to accept text parameter length: %u"
2162 "greater than MaxXmitDataSegmentLength %u.\n",
2163 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2164 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2165 (unsigned char *)hdr);
2166 }
2167
2168 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2169 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2170 pr_err("Multi sequence text commands currently not supported\n");
2171 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2172 (unsigned char *)hdr);
2173 }
2174
2175 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2176 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2177 hdr->exp_statsn, payload_length);
2178
2179 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2180 cmd->i_state = ISTATE_SEND_TEXTRSP;
2181 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2182 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2183 cmd->targ_xfer_tag = 0xFFFFFFFF;
2184 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2185 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2186 cmd->data_direction = DMA_NONE;
2187 kfree(cmd->text_in_ptr);
2188 cmd->text_in_ptr = NULL;
2189
2190 return 0;
2191 }
2192 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2193
2194 int
iscsit_process_text_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_text * hdr)2195 iscsit_process_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2196 struct iscsi_text *hdr)
2197 {
2198 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2199 int cmdsn_ret;
2200
2201 if (!text_in) {
2202 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2203 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2204 pr_err("Unable to locate text_in buffer for sendtargets"
2205 " discovery\n");
2206 goto reject;
2207 }
2208 goto empty_sendtargets;
2209 }
2210 if (strncmp("SendTargets=", text_in, 12) != 0) {
2211 pr_err("Received Text Data that is not"
2212 " SendTargets, cannot continue.\n");
2213 goto reject;
2214 }
2215 /* '=' confirmed in strncmp */
2216 text_ptr = strchr(text_in, '=');
2217 BUG_ON(!text_ptr);
2218 if (!strncmp("=All", text_ptr, 5)) {
2219 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2220 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2221 !strncmp("=eui.", text_ptr, 5)) {
2222 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2223 } else {
2224 pr_err("Unable to locate valid SendTargets%s value\n",
2225 text_ptr);
2226 goto reject;
2227 }
2228
2229 spin_lock_bh(&conn->cmd_lock);
2230 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2231 spin_unlock_bh(&conn->cmd_lock);
2232
2233 empty_sendtargets:
2234 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2235
2236 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2237 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2238 (unsigned char *)hdr, hdr->cmdsn);
2239 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2240 return -1;
2241
2242 return 0;
2243 }
2244
2245 return iscsit_execute_cmd(cmd, 0);
2246
2247 reject:
2248 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2249 (unsigned char *)hdr);
2250 }
2251 EXPORT_SYMBOL(iscsit_process_text_cmd);
2252
2253 static int
iscsit_handle_text_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)2254 iscsit_handle_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2255 unsigned char *buf)
2256 {
2257 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2258 char *text_in = NULL;
2259 u32 payload_length = ntoh24(hdr->dlength);
2260 int rx_size, rc;
2261
2262 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2263 if (rc < 0)
2264 return 0;
2265
2266 rx_size = payload_length;
2267 if (payload_length) {
2268 u32 checksum = 0, data_crc = 0;
2269 u32 padding = 0;
2270 int niov = 0, rx_got;
2271 struct kvec iov[2];
2272
2273 rx_size = ALIGN(payload_length, 4);
2274 text_in = kzalloc(rx_size, GFP_KERNEL);
2275 if (!text_in)
2276 goto reject;
2277
2278 cmd->text_in_ptr = text_in;
2279
2280 memset(iov, 0, sizeof(iov));
2281 iov[niov].iov_base = text_in;
2282 iov[niov++].iov_len = rx_size;
2283
2284 padding = rx_size - payload_length;
2285 if (padding)
2286 pr_debug("Receiving %u additional bytes"
2287 " for padding.\n", padding);
2288 if (conn->conn_ops->DataDigest) {
2289 iov[niov].iov_base = &checksum;
2290 iov[niov++].iov_len = ISCSI_CRC_LEN;
2291 rx_size += ISCSI_CRC_LEN;
2292 }
2293
2294 WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
2295 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2296 if (rx_got != rx_size)
2297 goto reject;
2298
2299 if (conn->conn_ops->DataDigest) {
2300 data_crc = iscsit_crc_buf(text_in,
2301 ALIGN(payload_length, 4),
2302 0, NULL);
2303 if (checksum != data_crc) {
2304 pr_err("Text data CRC32C DataDigest"
2305 " 0x%08x does not match computed"
2306 " 0x%08x\n", checksum, data_crc);
2307 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2308 pr_err("Unable to recover from"
2309 " Text Data digest failure while in"
2310 " ERL=0.\n");
2311 goto reject;
2312 } else {
2313 /*
2314 * Silently drop this PDU and let the
2315 * initiator plug the CmdSN gap.
2316 */
2317 pr_debug("Dropping Text"
2318 " Command CmdSN: 0x%08x due to"
2319 " DataCRC error.\n", hdr->cmdsn);
2320 kfree(text_in);
2321 cmd->text_in_ptr = NULL;
2322 return 0;
2323 }
2324 } else {
2325 pr_debug("Got CRC32C DataDigest"
2326 " 0x%08x for %u bytes of text data.\n",
2327 checksum, payload_length);
2328 }
2329 }
2330 text_in[payload_length - 1] = '\0';
2331 pr_debug("Successfully read %d bytes of text"
2332 " data.\n", payload_length);
2333 }
2334
2335 return iscsit_process_text_cmd(conn, cmd, hdr);
2336
2337 reject:
2338 kfree(cmd->text_in_ptr);
2339 cmd->text_in_ptr = NULL;
2340 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2341 }
2342
iscsit_logout_closesession(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2343 int iscsit_logout_closesession(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2344 {
2345 struct iscsit_conn *conn_p;
2346 struct iscsit_session *sess = conn->sess;
2347
2348 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2349 " for SID: %u.\n", conn->cid, conn->sess->sid);
2350
2351 atomic_set(&sess->session_logout, 1);
2352 atomic_set(&conn->conn_logout_remove, 1);
2353 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2354
2355 iscsit_inc_conn_usage_count(conn);
2356 iscsit_inc_session_usage_count(sess);
2357
2358 spin_lock_bh(&sess->conn_lock);
2359 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2360 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2361 continue;
2362
2363 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2364 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2365 }
2366 spin_unlock_bh(&sess->conn_lock);
2367
2368 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2369
2370 return 0;
2371 }
2372
iscsit_logout_closeconnection(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2373 int iscsit_logout_closeconnection(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2374 {
2375 struct iscsit_conn *l_conn;
2376 struct iscsit_session *sess = conn->sess;
2377
2378 pr_debug("Received logout request CLOSECONNECTION for CID:"
2379 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2380
2381 /*
2382 * A Logout Request with a CLOSECONNECTION reason code for a CID
2383 * can arrive on a connection with a differing CID.
2384 */
2385 if (conn->cid == cmd->logout_cid) {
2386 spin_lock_bh(&conn->state_lock);
2387 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2388 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2389
2390 atomic_set(&conn->conn_logout_remove, 1);
2391 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2392 iscsit_inc_conn_usage_count(conn);
2393
2394 spin_unlock_bh(&conn->state_lock);
2395 } else {
2396 /*
2397 * Handle all different cid CLOSECONNECTION requests in
2398 * iscsit_logout_post_handler_diffcid() as to give enough
2399 * time for any non immediate command's CmdSN to be
2400 * acknowledged on the connection in question.
2401 *
2402 * Here we simply make sure the CID is still around.
2403 */
2404 l_conn = iscsit_get_conn_from_cid(sess,
2405 cmd->logout_cid);
2406 if (!l_conn) {
2407 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2408 iscsit_add_cmd_to_response_queue(cmd, conn,
2409 cmd->i_state);
2410 return 0;
2411 }
2412
2413 iscsit_dec_conn_usage_count(l_conn);
2414 }
2415
2416 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2417
2418 return 0;
2419 }
2420
iscsit_logout_removeconnforrecovery(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2421 int iscsit_logout_removeconnforrecovery(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2422 {
2423 struct iscsit_session *sess = conn->sess;
2424
2425 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2426 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2427
2428 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2429 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2430 " while ERL!=2.\n");
2431 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2432 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2433 return 0;
2434 }
2435
2436 if (conn->cid == cmd->logout_cid) {
2437 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2438 " with CID: %hu on CID: %hu, implementation error.\n",
2439 cmd->logout_cid, conn->cid);
2440 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2441 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2442 return 0;
2443 }
2444
2445 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2446
2447 return 0;
2448 }
2449
2450 int
iscsit_handle_logout_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)2451 iscsit_handle_logout_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2452 unsigned char *buf)
2453 {
2454 int cmdsn_ret, logout_remove = 0;
2455 u8 reason_code = 0;
2456 struct iscsi_logout *hdr;
2457 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2458
2459 hdr = (struct iscsi_logout *) buf;
2460 reason_code = (hdr->flags & 0x7f);
2461
2462 if (tiqn) {
2463 spin_lock(&tiqn->logout_stats.lock);
2464 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2465 tiqn->logout_stats.normal_logouts++;
2466 else
2467 tiqn->logout_stats.abnormal_logouts++;
2468 spin_unlock(&tiqn->logout_stats.lock);
2469 }
2470
2471 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2472 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2473 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2474 hdr->cid, conn->cid);
2475
2476 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2477 pr_err("Received logout request on connection that"
2478 " is not in logged in state, ignoring request.\n");
2479 iscsit_free_cmd(cmd, false);
2480 return 0;
2481 }
2482
2483 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2484 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2485 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2486 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2487 cmd->targ_xfer_tag = 0xFFFFFFFF;
2488 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2489 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2490 cmd->logout_cid = be16_to_cpu(hdr->cid);
2491 cmd->logout_reason = reason_code;
2492 cmd->data_direction = DMA_NONE;
2493
2494 /*
2495 * We need to sleep in these cases (by returning 1) until the Logout
2496 * Response gets sent in the tx thread.
2497 */
2498 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2499 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2500 be16_to_cpu(hdr->cid) == conn->cid))
2501 logout_remove = 1;
2502
2503 spin_lock_bh(&conn->cmd_lock);
2504 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2505 spin_unlock_bh(&conn->cmd_lock);
2506
2507 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2508 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2509
2510 /*
2511 * Immediate commands are executed, well, immediately.
2512 * Non-Immediate Logout Commands are executed in CmdSN order.
2513 */
2514 if (cmd->immediate_cmd) {
2515 int ret = iscsit_execute_cmd(cmd, 0);
2516
2517 if (ret < 0)
2518 return ret;
2519 } else {
2520 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2521 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2522 logout_remove = 0;
2523 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2524 return -1;
2525 }
2526
2527 return logout_remove;
2528 }
2529 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2530
iscsit_handle_snack(struct iscsit_conn * conn,unsigned char * buf)2531 int iscsit_handle_snack(
2532 struct iscsit_conn *conn,
2533 unsigned char *buf)
2534 {
2535 struct iscsi_snack *hdr;
2536
2537 hdr = (struct iscsi_snack *) buf;
2538 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2539
2540 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2541 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2542 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2543 hdr->begrun, hdr->runlength, conn->cid);
2544
2545 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2546 pr_err("Initiator sent SNACK request while in"
2547 " ErrorRecoveryLevel=0.\n");
2548 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2549 buf);
2550 }
2551 /*
2552 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2553 * call from inside iscsi_send_recovery_datain_or_r2t().
2554 */
2555 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2556 case 0:
2557 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2558 hdr->itt,
2559 be32_to_cpu(hdr->ttt),
2560 be32_to_cpu(hdr->begrun),
2561 be32_to_cpu(hdr->runlength));
2562 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2563 return iscsit_handle_status_snack(conn, hdr->itt,
2564 be32_to_cpu(hdr->ttt),
2565 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2566 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2567 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2568 be32_to_cpu(hdr->begrun),
2569 be32_to_cpu(hdr->runlength));
2570 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2571 /* FIXME: Support R-Data SNACK */
2572 pr_err("R-Data SNACK Not Supported.\n");
2573 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2574 buf);
2575 default:
2576 pr_err("Unknown SNACK type 0x%02x, protocol"
2577 " error.\n", hdr->flags & 0x0f);
2578 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2579 buf);
2580 }
2581
2582 return 0;
2583 }
2584 EXPORT_SYMBOL(iscsit_handle_snack);
2585
iscsit_rx_thread_wait_for_tcp(struct iscsit_conn * conn)2586 static void iscsit_rx_thread_wait_for_tcp(struct iscsit_conn *conn)
2587 {
2588 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2589 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2590 wait_for_completion_interruptible_timeout(
2591 &conn->rx_half_close_comp,
2592 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2593 }
2594 }
2595
iscsit_handle_immediate_data(struct iscsit_cmd * cmd,struct iscsi_scsi_req * hdr,u32 length)2596 static int iscsit_handle_immediate_data(
2597 struct iscsit_cmd *cmd,
2598 struct iscsi_scsi_req *hdr,
2599 u32 length)
2600 {
2601 int iov_ret, rx_got = 0, rx_size = 0;
2602 u32 checksum, iov_count = 0, padding = 0;
2603 struct iscsit_conn *conn = cmd->conn;
2604 struct kvec *iov;
2605 void *overflow_buf = NULL;
2606
2607 BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
2608 rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
2609 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
2610 cmd->orig_iov_data_count - 2,
2611 cmd->write_data_done, rx_size);
2612 if (iov_ret < 0)
2613 return IMMEDIATE_DATA_CANNOT_RECOVER;
2614
2615 iov_count = iov_ret;
2616 iov = &cmd->iov_data[0];
2617 if (rx_size < length) {
2618 /*
2619 * Special case: length of immediate data exceeds the data
2620 * buffer size derived from the CDB.
2621 */
2622 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
2623 if (!overflow_buf) {
2624 iscsit_unmap_iovec(cmd);
2625 return IMMEDIATE_DATA_CANNOT_RECOVER;
2626 }
2627 cmd->overflow_buf = overflow_buf;
2628 iov[iov_count].iov_base = overflow_buf;
2629 iov[iov_count].iov_len = length - rx_size;
2630 iov_count++;
2631 rx_size = length;
2632 }
2633
2634 padding = ((-length) & 3);
2635 if (padding != 0) {
2636 iov[iov_count].iov_base = cmd->pad_bytes;
2637 iov[iov_count++].iov_len = padding;
2638 rx_size += padding;
2639 }
2640
2641 if (conn->conn_ops->DataDigest) {
2642 iov[iov_count].iov_base = &checksum;
2643 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2644 rx_size += ISCSI_CRC_LEN;
2645 }
2646
2647 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
2648 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2649
2650 iscsit_unmap_iovec(cmd);
2651
2652 if (rx_got != rx_size) {
2653 iscsit_rx_thread_wait_for_tcp(conn);
2654 return IMMEDIATE_DATA_CANNOT_RECOVER;
2655 }
2656
2657 if (conn->conn_ops->DataDigest) {
2658 u32 data_crc;
2659
2660 data_crc = iscsit_crc_sglist(cmd, length, padding,
2661 cmd->pad_bytes);
2662 if (checksum != data_crc) {
2663 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2664 " does not match computed 0x%08x\n", checksum,
2665 data_crc);
2666
2667 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2668 pr_err("Unable to recover from"
2669 " Immediate Data digest failure while"
2670 " in ERL=0.\n");
2671 iscsit_reject_cmd(cmd,
2672 ISCSI_REASON_DATA_DIGEST_ERROR,
2673 (unsigned char *)hdr);
2674 return IMMEDIATE_DATA_CANNOT_RECOVER;
2675 } else {
2676 iscsit_reject_cmd(cmd,
2677 ISCSI_REASON_DATA_DIGEST_ERROR,
2678 (unsigned char *)hdr);
2679 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2680 }
2681 } else {
2682 pr_debug("Got CRC32C DataDigest 0x%08x for"
2683 " %u bytes of Immediate Data\n", checksum,
2684 length);
2685 }
2686 }
2687
2688 cmd->write_data_done += length;
2689
2690 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2691 spin_lock_bh(&cmd->istate_lock);
2692 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2693 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2694 spin_unlock_bh(&cmd->istate_lock);
2695 }
2696
2697 return IMMEDIATE_DATA_NORMAL_OPERATION;
2698 }
2699
2700 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2701 with active network interface */
iscsit_build_conn_drop_async_message(struct iscsit_conn * conn)2702 static void iscsit_build_conn_drop_async_message(struct iscsit_conn *conn)
2703 {
2704 struct iscsit_cmd *cmd;
2705 struct iscsit_conn *conn_p;
2706 bool found = false;
2707
2708 lockdep_assert_held(&conn->sess->conn_lock);
2709
2710 /*
2711 * Only send a Asynchronous Message on connections whos network
2712 * interface is still functional.
2713 */
2714 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2715 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2716 iscsit_inc_conn_usage_count(conn_p);
2717 found = true;
2718 break;
2719 }
2720 }
2721
2722 if (!found)
2723 return;
2724
2725 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2726 if (!cmd) {
2727 iscsit_dec_conn_usage_count(conn_p);
2728 return;
2729 }
2730
2731 cmd->logout_cid = conn->cid;
2732 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2733 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2734
2735 spin_lock_bh(&conn_p->cmd_lock);
2736 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2737 spin_unlock_bh(&conn_p->cmd_lock);
2738
2739 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2740 iscsit_dec_conn_usage_count(conn_p);
2741 }
2742
iscsit_send_conn_drop_async_message(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2743 static int iscsit_send_conn_drop_async_message(
2744 struct iscsit_cmd *cmd,
2745 struct iscsit_conn *conn)
2746 {
2747 struct iscsi_async *hdr;
2748
2749 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2750
2751 hdr = (struct iscsi_async *) cmd->pdu;
2752 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2753 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2754 cmd->init_task_tag = RESERVED_ITT;
2755 cmd->targ_xfer_tag = 0xFFFFFFFF;
2756 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2757 cmd->stat_sn = conn->stat_sn++;
2758 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2759 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2760 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2761 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2762 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2763 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2764 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2765
2766 pr_debug("Sending Connection Dropped Async Message StatSN:"
2767 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2768 cmd->logout_cid, conn->cid);
2769
2770 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2771 }
2772
iscsit_tx_thread_wait_for_tcp(struct iscsit_conn * conn)2773 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *conn)
2774 {
2775 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2776 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2777 wait_for_completion_interruptible_timeout(
2778 &conn->tx_half_close_comp,
2779 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2780 }
2781 }
2782
2783 void
iscsit_build_datain_pdu(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_datain * datain,struct iscsi_data_rsp * hdr,bool set_statsn)2784 iscsit_build_datain_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2785 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2786 bool set_statsn)
2787 {
2788 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2789 hdr->flags = datain->flags;
2790 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2791 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2792 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2793 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2794 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2795 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2796 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2797 }
2798 }
2799 hton24(hdr->dlength, datain->length);
2800 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2801 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2802 (struct scsi_lun *)&hdr->lun);
2803 else
2804 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2805
2806 hdr->itt = cmd->init_task_tag;
2807
2808 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2809 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2810 else
2811 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2812 if (set_statsn)
2813 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2814 else
2815 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2816
2817 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2818 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2819 hdr->datasn = cpu_to_be32(datain->data_sn);
2820 hdr->offset = cpu_to_be32(datain->offset);
2821
2822 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2823 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2824 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2825 ntohl(hdr->offset), datain->length, conn->cid);
2826 }
2827 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2828
iscsit_send_datain(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2829 static int iscsit_send_datain(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2830 {
2831 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2832 struct iscsi_datain datain;
2833 struct iscsi_datain_req *dr;
2834 int eodr = 0, ret;
2835 bool set_statsn = false;
2836
2837 memset(&datain, 0, sizeof(struct iscsi_datain));
2838 dr = iscsit_get_datain_values(cmd, &datain);
2839 if (!dr) {
2840 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2841 cmd->init_task_tag);
2842 return -1;
2843 }
2844 /*
2845 * Be paranoid and double check the logic for now.
2846 */
2847 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2848 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2849 " datain.length: %u exceeds cmd->data_length: %u\n",
2850 cmd->init_task_tag, datain.offset, datain.length,
2851 cmd->se_cmd.data_length);
2852 return -1;
2853 }
2854
2855 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2856 /*
2857 * Special case for successfully execution w/ both DATAIN
2858 * and Sense Data.
2859 */
2860 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2861 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2862 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2863 else {
2864 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2865 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2866 iscsit_increment_maxcmdsn(cmd, conn->sess);
2867 cmd->stat_sn = conn->stat_sn++;
2868 set_statsn = true;
2869 } else if (dr->dr_complete ==
2870 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2871 set_statsn = true;
2872 }
2873
2874 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2875
2876 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2877 if (ret < 0)
2878 return ret;
2879
2880 if (dr->dr_complete) {
2881 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2882 2 : 1;
2883 iscsit_free_datain_req(cmd, dr);
2884 }
2885
2886 return eodr;
2887 }
2888
2889 int
iscsit_build_logout_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_logout_rsp * hdr)2890 iscsit_build_logout_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2891 struct iscsi_logout_rsp *hdr)
2892 {
2893 struct iscsit_conn *logout_conn = NULL;
2894 struct iscsi_conn_recovery *cr = NULL;
2895 struct iscsit_session *sess = conn->sess;
2896 /*
2897 * The actual shutting down of Sessions and/or Connections
2898 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2899 * is done in scsi_logout_post_handler().
2900 */
2901 switch (cmd->logout_reason) {
2902 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2903 pr_debug("iSCSI session logout successful, setting"
2904 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2905 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2906 break;
2907 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2908 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2909 break;
2910 /*
2911 * For CLOSECONNECTION logout requests carrying
2912 * a matching logout CID -> local CID, the reference
2913 * for the local CID will have been incremented in
2914 * iscsi_logout_closeconnection().
2915 *
2916 * For CLOSECONNECTION logout requests carrying
2917 * a different CID than the connection it arrived
2918 * on, the connection responding to cmd->logout_cid
2919 * is stopped in iscsit_logout_post_handler_diffcid().
2920 */
2921
2922 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2923 " successful.\n", cmd->logout_cid, conn->cid);
2924 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2925 break;
2926 case ISCSI_LOGOUT_REASON_RECOVERY:
2927 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2928 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2929 break;
2930 /*
2931 * If the connection is still active from our point of view
2932 * force connection recovery to occur.
2933 */
2934 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2935 cmd->logout_cid);
2936 if (logout_conn) {
2937 iscsit_connection_reinstatement_rcfr(logout_conn);
2938 iscsit_dec_conn_usage_count(logout_conn);
2939 }
2940
2941 cr = iscsit_get_inactive_connection_recovery_entry(
2942 conn->sess, cmd->logout_cid);
2943 if (!cr) {
2944 pr_err("Unable to locate CID: %hu for"
2945 " REMOVECONNFORRECOVERY Logout Request.\n",
2946 cmd->logout_cid);
2947 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2948 break;
2949 }
2950
2951 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2952
2953 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2954 " for recovery for CID: %hu on CID: %hu successful.\n",
2955 cmd->logout_cid, conn->cid);
2956 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2957 break;
2958 default:
2959 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2960 cmd->logout_reason);
2961 return -1;
2962 }
2963
2964 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2965 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2966 hdr->response = cmd->logout_response;
2967 hdr->itt = cmd->init_task_tag;
2968 cmd->stat_sn = conn->stat_sn++;
2969 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2970
2971 iscsit_increment_maxcmdsn(cmd, conn->sess);
2972 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2973 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2974
2975 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2976 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2977 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2978 cmd->logout_cid, conn->cid);
2979
2980 return 0;
2981 }
2982 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2983
2984 static int
iscsit_send_logout(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2985 iscsit_send_logout(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2986 {
2987 int rc;
2988
2989 rc = iscsit_build_logout_rsp(cmd, conn,
2990 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2991 if (rc < 0)
2992 return rc;
2993
2994 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2995 }
2996
2997 void
iscsit_build_nopin_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_nopin * hdr,bool nopout_response)2998 iscsit_build_nopin_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2999 struct iscsi_nopin *hdr, bool nopout_response)
3000 {
3001 hdr->opcode = ISCSI_OP_NOOP_IN;
3002 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3003 hton24(hdr->dlength, cmd->buf_ptr_size);
3004 if (nopout_response)
3005 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
3006 hdr->itt = cmd->init_task_tag;
3007 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3008 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
3009 conn->stat_sn;
3010 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3011
3012 if (nopout_response)
3013 iscsit_increment_maxcmdsn(cmd, conn->sess);
3014
3015 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3016 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3017
3018 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3019 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3020 "Solicited" : "Unsolicited", cmd->init_task_tag,
3021 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3022 }
3023 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3024
3025 /*
3026 * Unsolicited NOPIN, either requesting a response or not.
3027 */
iscsit_send_unsolicited_nopin(struct iscsit_cmd * cmd,struct iscsit_conn * conn,int want_response)3028 static int iscsit_send_unsolicited_nopin(
3029 struct iscsit_cmd *cmd,
3030 struct iscsit_conn *conn,
3031 int want_response)
3032 {
3033 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3034 int ret;
3035
3036 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3037
3038 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3039 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3040
3041 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3042 if (ret < 0)
3043 return ret;
3044
3045 spin_lock_bh(&cmd->istate_lock);
3046 cmd->i_state = want_response ?
3047 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3048 spin_unlock_bh(&cmd->istate_lock);
3049
3050 return 0;
3051 }
3052
3053 static int
iscsit_send_nopin(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3054 iscsit_send_nopin(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3055 {
3056 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3057
3058 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3059
3060 /*
3061 * NOPOUT Ping Data is attached to struct iscsit_cmd->buf_ptr.
3062 * NOPOUT DataSegmentLength is at struct iscsit_cmd->buf_ptr_size.
3063 */
3064 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3065
3066 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3067 cmd->buf_ptr,
3068 cmd->buf_ptr_size);
3069 }
3070
iscsit_send_r2t(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3071 static int iscsit_send_r2t(
3072 struct iscsit_cmd *cmd,
3073 struct iscsit_conn *conn)
3074 {
3075 struct iscsi_r2t *r2t;
3076 struct iscsi_r2t_rsp *hdr;
3077 int ret;
3078
3079 r2t = iscsit_get_r2t_from_list(cmd);
3080 if (!r2t)
3081 return -1;
3082
3083 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3084 memset(hdr, 0, ISCSI_HDR_LEN);
3085 hdr->opcode = ISCSI_OP_R2T;
3086 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3087 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3088 (struct scsi_lun *)&hdr->lun);
3089 hdr->itt = cmd->init_task_tag;
3090 if (conn->conn_transport->iscsit_get_r2t_ttt)
3091 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3092 else
3093 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3094 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3095 hdr->statsn = cpu_to_be32(conn->stat_sn);
3096 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3097 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3098 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3099 hdr->data_offset = cpu_to_be32(r2t->offset);
3100 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3101
3102 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3103 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3104 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3105 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3106 r2t->offset, r2t->xfer_len, conn->cid);
3107
3108 spin_lock_bh(&cmd->r2t_lock);
3109 r2t->sent_r2t = 1;
3110 spin_unlock_bh(&cmd->r2t_lock);
3111
3112 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3113 if (ret < 0) {
3114 return ret;
3115 }
3116
3117 spin_lock_bh(&cmd->dataout_timeout_lock);
3118 iscsit_start_dataout_timer(cmd, conn);
3119 spin_unlock_bh(&cmd->dataout_timeout_lock);
3120
3121 return 0;
3122 }
3123
3124 /*
3125 * @recovery: If called from iscsi_task_reassign_complete_write() for
3126 * connection recovery.
3127 */
iscsit_build_r2ts_for_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,bool recovery)3128 int iscsit_build_r2ts_for_cmd(
3129 struct iscsit_conn *conn,
3130 struct iscsit_cmd *cmd,
3131 bool recovery)
3132 {
3133 int first_r2t = 1;
3134 u32 offset = 0, xfer_len = 0;
3135
3136 spin_lock_bh(&cmd->r2t_lock);
3137 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3138 spin_unlock_bh(&cmd->r2t_lock);
3139 return 0;
3140 }
3141
3142 if (conn->sess->sess_ops->DataSequenceInOrder &&
3143 !recovery)
3144 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3145
3146 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3147 if (conn->sess->sess_ops->DataSequenceInOrder) {
3148 offset = cmd->r2t_offset;
3149
3150 if (first_r2t && recovery) {
3151 int new_data_end = offset +
3152 conn->sess->sess_ops->MaxBurstLength -
3153 cmd->next_burst_len;
3154
3155 if (new_data_end > cmd->se_cmd.data_length)
3156 xfer_len = cmd->se_cmd.data_length - offset;
3157 else
3158 xfer_len =
3159 conn->sess->sess_ops->MaxBurstLength -
3160 cmd->next_burst_len;
3161 } else {
3162 int new_data_end = offset +
3163 conn->sess->sess_ops->MaxBurstLength;
3164
3165 if (new_data_end > cmd->se_cmd.data_length)
3166 xfer_len = cmd->se_cmd.data_length - offset;
3167 else
3168 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3169 }
3170
3171 if ((s32)xfer_len < 0) {
3172 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3173 break;
3174 }
3175
3176 cmd->r2t_offset += xfer_len;
3177
3178 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3179 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3180 } else {
3181 struct iscsi_seq *seq;
3182
3183 seq = iscsit_get_seq_holder_for_r2t(cmd);
3184 if (!seq) {
3185 spin_unlock_bh(&cmd->r2t_lock);
3186 return -1;
3187 }
3188
3189 offset = seq->offset;
3190 xfer_len = seq->xfer_len;
3191
3192 if (cmd->seq_send_order == cmd->seq_count)
3193 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3194 }
3195 cmd->outstanding_r2ts++;
3196 first_r2t = 0;
3197
3198 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3199 spin_unlock_bh(&cmd->r2t_lock);
3200 return -1;
3201 }
3202
3203 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3204 break;
3205 }
3206 spin_unlock_bh(&cmd->r2t_lock);
3207
3208 return 0;
3209 }
3210 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3211
iscsit_build_rsp_pdu(struct iscsit_cmd * cmd,struct iscsit_conn * conn,bool inc_stat_sn,struct iscsi_scsi_rsp * hdr)3212 void iscsit_build_rsp_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3213 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3214 {
3215 if (inc_stat_sn)
3216 cmd->stat_sn = conn->stat_sn++;
3217
3218 atomic_long_inc(&conn->sess->rsp_pdus);
3219
3220 memset(hdr, 0, ISCSI_HDR_LEN);
3221 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3222 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3223 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3224 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3225 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3226 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3227 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3228 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3229 }
3230 hdr->response = cmd->iscsi_response;
3231 hdr->cmd_status = cmd->se_cmd.scsi_status;
3232 hdr->itt = cmd->init_task_tag;
3233 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3234
3235 iscsit_increment_maxcmdsn(cmd, conn->sess);
3236 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3237 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3238
3239 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3240 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3241 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3242 cmd->se_cmd.scsi_status, conn->cid);
3243 }
3244 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3245
iscsit_send_response(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3246 static int iscsit_send_response(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3247 {
3248 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3249 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3250 void *data_buf = NULL;
3251 u32 padding = 0, data_buf_len = 0;
3252
3253 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3254
3255 /*
3256 * Attach SENSE DATA payload to iSCSI Response PDU
3257 */
3258 if (cmd->se_cmd.sense_buffer &&
3259 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3260 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3261 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3262 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3263
3264 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3265 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3266 data_buf = cmd->sense_buffer;
3267 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3268
3269 if (padding) {
3270 memset(cmd->sense_buffer +
3271 cmd->se_cmd.scsi_sense_length, 0, padding);
3272 pr_debug("Adding %u bytes of padding to"
3273 " SENSE.\n", padding);
3274 }
3275
3276 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3277 " Response PDU\n",
3278 cmd->se_cmd.scsi_sense_length);
3279 }
3280
3281 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3282 data_buf_len);
3283 }
3284
iscsit_convert_tcm_tmr_rsp(struct se_tmr_req * se_tmr)3285 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3286 {
3287 switch (se_tmr->response) {
3288 case TMR_FUNCTION_COMPLETE:
3289 return ISCSI_TMF_RSP_COMPLETE;
3290 case TMR_TASK_DOES_NOT_EXIST:
3291 return ISCSI_TMF_RSP_NO_TASK;
3292 case TMR_LUN_DOES_NOT_EXIST:
3293 return ISCSI_TMF_RSP_NO_LUN;
3294 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3295 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3296 case TMR_FUNCTION_REJECTED:
3297 default:
3298 return ISCSI_TMF_RSP_REJECTED;
3299 }
3300 }
3301
3302 void
iscsit_build_task_mgt_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_tm_rsp * hdr)3303 iscsit_build_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3304 struct iscsi_tm_rsp *hdr)
3305 {
3306 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3307
3308 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3309 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3310 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3311 hdr->itt = cmd->init_task_tag;
3312 cmd->stat_sn = conn->stat_sn++;
3313 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3314
3315 iscsit_increment_maxcmdsn(cmd, conn->sess);
3316 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3317 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3318
3319 pr_debug("Built Task Management Response ITT: 0x%08x,"
3320 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3321 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3322 }
3323 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3324
3325 static int
iscsit_send_task_mgt_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3326 iscsit_send_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3327 {
3328 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3329
3330 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3331
3332 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3333 }
3334
3335 #define SENDTARGETS_BUF_LIMIT 32768U
3336
3337 static int
iscsit_build_sendtargets_response(struct iscsit_cmd * cmd,enum iscsit_transport_type network_transport,int skip_bytes,bool * completed)3338 iscsit_build_sendtargets_response(struct iscsit_cmd *cmd,
3339 enum iscsit_transport_type network_transport,
3340 int skip_bytes, bool *completed)
3341 {
3342 char *payload = NULL;
3343 struct iscsit_conn *conn = cmd->conn;
3344 struct iscsi_portal_group *tpg;
3345 struct iscsi_tiqn *tiqn;
3346 struct iscsi_tpg_np *tpg_np;
3347 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3348 int target_name_printed;
3349 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3350 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3351 bool active;
3352
3353 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3354 SENDTARGETS_BUF_LIMIT);
3355
3356 payload = kzalloc(buffer_len, GFP_KERNEL);
3357 if (!payload)
3358 return -ENOMEM;
3359
3360 /*
3361 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3362 * explicit case..
3363 */
3364 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3365 text_ptr = strchr(text_in, '=');
3366 if (!text_ptr) {
3367 pr_err("Unable to locate '=' string in text_in:"
3368 " %s\n", text_in);
3369 kfree(payload);
3370 return -EINVAL;
3371 }
3372 /*
3373 * Skip over '=' character..
3374 */
3375 text_ptr += 1;
3376 }
3377
3378 spin_lock(&tiqn_lock);
3379 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3380 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3381 strcmp(tiqn->tiqn, text_ptr)) {
3382 continue;
3383 }
3384
3385 target_name_printed = 0;
3386
3387 spin_lock(&tiqn->tiqn_tpg_lock);
3388 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3389
3390 /* If demo_mode_discovery=0 and generate_node_acls=0
3391 * (demo mode dislabed) do not return
3392 * TargetName+TargetAddress unless a NodeACL exists.
3393 */
3394
3395 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3396 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3397 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3398 cmd->conn->sess->sess_ops->InitiatorName))) {
3399 continue;
3400 }
3401
3402 spin_lock(&tpg->tpg_state_lock);
3403 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3404 spin_unlock(&tpg->tpg_state_lock);
3405
3406 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3407 continue;
3408
3409 spin_lock(&tpg->tpg_np_lock);
3410 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3411 tpg_np_list) {
3412 struct iscsi_np *np = tpg_np->tpg_np;
3413 struct sockaddr_storage *sockaddr;
3414
3415 if (np->np_network_transport != network_transport)
3416 continue;
3417
3418 if (!target_name_printed) {
3419 len = sprintf(buf, "TargetName=%s",
3420 tiqn->tiqn);
3421 len += 1;
3422
3423 if ((len + payload_len) > buffer_len) {
3424 spin_unlock(&tpg->tpg_np_lock);
3425 spin_unlock(&tiqn->tiqn_tpg_lock);
3426 end_of_buf = 1;
3427 goto eob;
3428 }
3429
3430 if (skip_bytes && len <= skip_bytes) {
3431 skip_bytes -= len;
3432 } else {
3433 memcpy(payload + payload_len, buf, len);
3434 payload_len += len;
3435 target_name_printed = 1;
3436 if (len > skip_bytes)
3437 skip_bytes = 0;
3438 }
3439 }
3440
3441 if (inet_addr_is_any(&np->np_sockaddr))
3442 sockaddr = &conn->local_sockaddr;
3443 else
3444 sockaddr = &np->np_sockaddr;
3445
3446 len = sprintf(buf, "TargetAddress="
3447 "%pISpc,%hu",
3448 sockaddr,
3449 tpg->tpgt);
3450 len += 1;
3451
3452 if ((len + payload_len) > buffer_len) {
3453 spin_unlock(&tpg->tpg_np_lock);
3454 spin_unlock(&tiqn->tiqn_tpg_lock);
3455 end_of_buf = 1;
3456 goto eob;
3457 }
3458
3459 if (skip_bytes && len <= skip_bytes) {
3460 skip_bytes -= len;
3461 } else {
3462 memcpy(payload + payload_len, buf, len);
3463 payload_len += len;
3464 if (len > skip_bytes)
3465 skip_bytes = 0;
3466 }
3467 }
3468 spin_unlock(&tpg->tpg_np_lock);
3469 }
3470 spin_unlock(&tiqn->tiqn_tpg_lock);
3471 eob:
3472 if (end_of_buf) {
3473 *completed = false;
3474 break;
3475 }
3476
3477 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3478 break;
3479 }
3480 spin_unlock(&tiqn_lock);
3481
3482 cmd->buf_ptr = payload;
3483
3484 return payload_len;
3485 }
3486
3487 int
iscsit_build_text_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_text_rsp * hdr,enum iscsit_transport_type network_transport)3488 iscsit_build_text_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3489 struct iscsi_text_rsp *hdr,
3490 enum iscsit_transport_type network_transport)
3491 {
3492 int text_length, padding;
3493 bool completed = true;
3494
3495 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3496 cmd->read_data_done,
3497 &completed);
3498 if (text_length < 0)
3499 return text_length;
3500
3501 if (completed) {
3502 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3503 } else {
3504 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3505 cmd->read_data_done += text_length;
3506 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3507 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3508 }
3509 hdr->opcode = ISCSI_OP_TEXT_RSP;
3510 padding = ((-text_length) & 3);
3511 hton24(hdr->dlength, text_length);
3512 hdr->itt = cmd->init_task_tag;
3513 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3514 cmd->stat_sn = conn->stat_sn++;
3515 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3516
3517 iscsit_increment_maxcmdsn(cmd, conn->sess);
3518 /*
3519 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3520 * correctly increment MaxCmdSN for each response answering a
3521 * non immediate text request with a valid CmdSN.
3522 */
3523 cmd->maxcmdsn_inc = 0;
3524 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3525 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3526
3527 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3528 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3529 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3530 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3531 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3532
3533 return text_length + padding;
3534 }
3535 EXPORT_SYMBOL(iscsit_build_text_rsp);
3536
iscsit_send_text_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3537 static int iscsit_send_text_rsp(
3538 struct iscsit_cmd *cmd,
3539 struct iscsit_conn *conn)
3540 {
3541 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3542 int text_length;
3543
3544 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3545 conn->conn_transport->transport_type);
3546 if (text_length < 0)
3547 return text_length;
3548
3549 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3550 cmd->buf_ptr,
3551 text_length);
3552 }
3553
3554 void
iscsit_build_reject(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_reject * hdr)3555 iscsit_build_reject(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3556 struct iscsi_reject *hdr)
3557 {
3558 hdr->opcode = ISCSI_OP_REJECT;
3559 hdr->reason = cmd->reject_reason;
3560 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3561 hton24(hdr->dlength, ISCSI_HDR_LEN);
3562 hdr->ffffffff = cpu_to_be32(0xffffffff);
3563 cmd->stat_sn = conn->stat_sn++;
3564 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3565 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3566 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3567
3568 }
3569 EXPORT_SYMBOL(iscsit_build_reject);
3570
iscsit_send_reject(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3571 static int iscsit_send_reject(
3572 struct iscsit_cmd *cmd,
3573 struct iscsit_conn *conn)
3574 {
3575 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3576
3577 iscsit_build_reject(cmd, conn, hdr);
3578
3579 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3580 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3581
3582 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3583 cmd->buf_ptr,
3584 ISCSI_HDR_LEN);
3585 }
3586
iscsit_thread_get_cpumask(struct iscsit_conn * conn)3587 void iscsit_thread_get_cpumask(struct iscsit_conn *conn)
3588 {
3589 int ord, cpu;
3590 cpumask_var_t conn_allowed_cpumask;
3591
3592 /*
3593 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3594 * within iscsit_start_kthreads()
3595 *
3596 * Here we use bitmap_id to determine which CPU that this
3597 * iSCSI connection's RX/TX threads will be scheduled to
3598 * execute upon.
3599 */
3600 if (!zalloc_cpumask_var(&conn_allowed_cpumask, GFP_KERNEL)) {
3601 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3602 for_each_online_cpu(cpu) {
3603 if (ord-- == 0) {
3604 cpumask_set_cpu(cpu, conn->conn_cpumask);
3605 return;
3606 }
3607 }
3608 } else {
3609 cpumask_and(conn_allowed_cpumask, iscsit_global->allowed_cpumask,
3610 cpu_online_mask);
3611
3612 cpumask_clear(conn->conn_cpumask);
3613 ord = conn->bitmap_id % cpumask_weight(conn_allowed_cpumask);
3614 for_each_cpu(cpu, conn_allowed_cpumask) {
3615 if (ord-- == 0) {
3616 cpumask_set_cpu(cpu, conn->conn_cpumask);
3617 free_cpumask_var(conn_allowed_cpumask);
3618 return;
3619 }
3620 }
3621 free_cpumask_var(conn_allowed_cpumask);
3622 }
3623 /*
3624 * This should never be reached..
3625 */
3626 dump_stack();
3627 cpumask_setall(conn->conn_cpumask);
3628 }
3629
iscsit_thread_reschedule(struct iscsit_conn * conn)3630 static void iscsit_thread_reschedule(struct iscsit_conn *conn)
3631 {
3632 /*
3633 * If iscsit_global->allowed_cpumask modified, reschedule iSCSI
3634 * connection's RX/TX threads update conn->allowed_cpumask.
3635 */
3636 if (!cpumask_equal(iscsit_global->allowed_cpumask,
3637 conn->allowed_cpumask)) {
3638 iscsit_thread_get_cpumask(conn);
3639 conn->conn_tx_reset_cpumask = 1;
3640 conn->conn_rx_reset_cpumask = 1;
3641 cpumask_copy(conn->allowed_cpumask,
3642 iscsit_global->allowed_cpumask);
3643 }
3644 }
3645
iscsit_thread_check_cpumask(struct iscsit_conn * conn,struct task_struct * p,int mode)3646 void iscsit_thread_check_cpumask(
3647 struct iscsit_conn *conn,
3648 struct task_struct *p,
3649 int mode)
3650 {
3651 /*
3652 * The TX and RX threads maybe call iscsit_thread_check_cpumask()
3653 * at the same time. The RX thread might be faster and return from
3654 * iscsit_thread_reschedule() with conn_rx_reset_cpumask set to 0.
3655 * Then the TX thread sets it back to 1.
3656 * The next time the RX thread loops, it sees conn_rx_reset_cpumask
3657 * set to 1 and calls set_cpus_allowed_ptr() again and set it to 0.
3658 */
3659 iscsit_thread_reschedule(conn);
3660
3661 /*
3662 * mode == 1 signals iscsi_target_tx_thread() usage.
3663 * mode == 0 signals iscsi_target_rx_thread() usage.
3664 */
3665 if (mode == 1) {
3666 if (!conn->conn_tx_reset_cpumask)
3667 return;
3668 } else {
3669 if (!conn->conn_rx_reset_cpumask)
3670 return;
3671 }
3672
3673 /*
3674 * Update the CPU mask for this single kthread so that
3675 * both TX and RX kthreads are scheduled to run on the
3676 * same CPU.
3677 */
3678 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3679 if (mode == 1)
3680 conn->conn_tx_reset_cpumask = 0;
3681 else
3682 conn->conn_rx_reset_cpumask = 0;
3683 }
3684 EXPORT_SYMBOL(iscsit_thread_check_cpumask);
3685
3686 int
iscsit_immediate_queue(struct iscsit_conn * conn,struct iscsit_cmd * cmd,int state)3687 iscsit_immediate_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
3688 {
3689 int ret;
3690
3691 switch (state) {
3692 case ISTATE_SEND_R2T:
3693 ret = iscsit_send_r2t(cmd, conn);
3694 if (ret < 0)
3695 goto err;
3696 break;
3697 case ISTATE_REMOVE:
3698 spin_lock_bh(&conn->cmd_lock);
3699 list_del_init(&cmd->i_conn_node);
3700 spin_unlock_bh(&conn->cmd_lock);
3701
3702 iscsit_free_cmd(cmd, false);
3703 break;
3704 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3705 iscsit_mod_nopin_response_timer(conn);
3706 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3707 if (ret < 0)
3708 goto err;
3709 break;
3710 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3711 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3712 if (ret < 0)
3713 goto err;
3714 break;
3715 default:
3716 pr_err("Unknown Opcode: 0x%02x ITT:"
3717 " 0x%08x, i_state: %d on CID: %hu\n",
3718 cmd->iscsi_opcode, cmd->init_task_tag, state,
3719 conn->cid);
3720 goto err;
3721 }
3722
3723 return 0;
3724
3725 err:
3726 return -1;
3727 }
3728 EXPORT_SYMBOL(iscsit_immediate_queue);
3729
3730 static int
iscsit_handle_immediate_queue(struct iscsit_conn * conn)3731 iscsit_handle_immediate_queue(struct iscsit_conn *conn)
3732 {
3733 struct iscsit_transport *t = conn->conn_transport;
3734 struct iscsi_queue_req *qr;
3735 struct iscsit_cmd *cmd;
3736 u8 state;
3737 int ret;
3738
3739 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3740 atomic_set(&conn->check_immediate_queue, 0);
3741 cmd = qr->cmd;
3742 state = qr->state;
3743 kmem_cache_free(lio_qr_cache, qr);
3744
3745 ret = t->iscsit_immediate_queue(conn, cmd, state);
3746 if (ret < 0)
3747 return ret;
3748 }
3749
3750 return 0;
3751 }
3752
3753 int
iscsit_response_queue(struct iscsit_conn * conn,struct iscsit_cmd * cmd,int state)3754 iscsit_response_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
3755 {
3756 int ret;
3757
3758 check_rsp_state:
3759 switch (state) {
3760 case ISTATE_SEND_DATAIN:
3761 ret = iscsit_send_datain(cmd, conn);
3762 if (ret < 0)
3763 goto err;
3764 else if (!ret)
3765 /* more drs */
3766 goto check_rsp_state;
3767 else if (ret == 1) {
3768 /* all done */
3769 spin_lock_bh(&cmd->istate_lock);
3770 cmd->i_state = ISTATE_SENT_STATUS;
3771 spin_unlock_bh(&cmd->istate_lock);
3772
3773 if (atomic_read(&conn->check_immediate_queue))
3774 return 1;
3775
3776 return 0;
3777 } else if (ret == 2) {
3778 /* Still must send status,
3779 SCF_TRANSPORT_TASK_SENSE was set */
3780 spin_lock_bh(&cmd->istate_lock);
3781 cmd->i_state = ISTATE_SEND_STATUS;
3782 spin_unlock_bh(&cmd->istate_lock);
3783 state = ISTATE_SEND_STATUS;
3784 goto check_rsp_state;
3785 }
3786
3787 break;
3788 case ISTATE_SEND_STATUS:
3789 case ISTATE_SEND_STATUS_RECOVERY:
3790 ret = iscsit_send_response(cmd, conn);
3791 break;
3792 case ISTATE_SEND_LOGOUTRSP:
3793 ret = iscsit_send_logout(cmd, conn);
3794 break;
3795 case ISTATE_SEND_ASYNCMSG:
3796 ret = iscsit_send_conn_drop_async_message(
3797 cmd, conn);
3798 break;
3799 case ISTATE_SEND_NOPIN:
3800 ret = iscsit_send_nopin(cmd, conn);
3801 break;
3802 case ISTATE_SEND_REJECT:
3803 ret = iscsit_send_reject(cmd, conn);
3804 break;
3805 case ISTATE_SEND_TASKMGTRSP:
3806 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3807 if (ret != 0)
3808 break;
3809 ret = iscsit_tmr_post_handler(cmd, conn);
3810 if (ret != 0)
3811 iscsit_fall_back_to_erl0(conn->sess);
3812 break;
3813 case ISTATE_SEND_TEXTRSP:
3814 ret = iscsit_send_text_rsp(cmd, conn);
3815 break;
3816 default:
3817 pr_err("Unknown Opcode: 0x%02x ITT:"
3818 " 0x%08x, i_state: %d on CID: %hu\n",
3819 cmd->iscsi_opcode, cmd->init_task_tag,
3820 state, conn->cid);
3821 goto err;
3822 }
3823 if (ret < 0)
3824 goto err;
3825
3826 switch (state) {
3827 case ISTATE_SEND_LOGOUTRSP:
3828 if (!iscsit_logout_post_handler(cmd, conn))
3829 return -ECONNRESET;
3830 fallthrough;
3831 case ISTATE_SEND_STATUS:
3832 case ISTATE_SEND_ASYNCMSG:
3833 case ISTATE_SEND_NOPIN:
3834 case ISTATE_SEND_STATUS_RECOVERY:
3835 case ISTATE_SEND_TEXTRSP:
3836 case ISTATE_SEND_TASKMGTRSP:
3837 case ISTATE_SEND_REJECT:
3838 spin_lock_bh(&cmd->istate_lock);
3839 cmd->i_state = ISTATE_SENT_STATUS;
3840 spin_unlock_bh(&cmd->istate_lock);
3841 break;
3842 default:
3843 pr_err("Unknown Opcode: 0x%02x ITT:"
3844 " 0x%08x, i_state: %d on CID: %hu\n",
3845 cmd->iscsi_opcode, cmd->init_task_tag,
3846 cmd->i_state, conn->cid);
3847 goto err;
3848 }
3849
3850 if (atomic_read(&conn->check_immediate_queue))
3851 return 1;
3852
3853 return 0;
3854
3855 err:
3856 return -1;
3857 }
3858 EXPORT_SYMBOL(iscsit_response_queue);
3859
iscsit_handle_response_queue(struct iscsit_conn * conn)3860 static int iscsit_handle_response_queue(struct iscsit_conn *conn)
3861 {
3862 struct iscsit_transport *t = conn->conn_transport;
3863 struct iscsi_queue_req *qr;
3864 struct iscsit_cmd *cmd;
3865 u8 state;
3866 int ret;
3867
3868 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3869 cmd = qr->cmd;
3870 state = qr->state;
3871 kmem_cache_free(lio_qr_cache, qr);
3872
3873 ret = t->iscsit_response_queue(conn, cmd, state);
3874 if (ret == 1 || ret < 0)
3875 return ret;
3876 }
3877
3878 return 0;
3879 }
3880
iscsi_target_tx_thread(void * arg)3881 int iscsi_target_tx_thread(void *arg)
3882 {
3883 int ret = 0;
3884 struct iscsit_conn *conn = arg;
3885 bool conn_freed = false;
3886
3887 /*
3888 * Allow ourselves to be interrupted by SIGINT so that a
3889 * connection recovery / failure event can be triggered externally.
3890 */
3891 allow_signal(SIGINT);
3892
3893 while (!kthread_should_stop()) {
3894 /*
3895 * Ensure that both TX and RX per connection kthreads
3896 * are scheduled to run on the same CPU.
3897 */
3898 iscsit_thread_check_cpumask(conn, current, 1);
3899
3900 wait_event_interruptible(conn->queues_wq,
3901 !iscsit_conn_all_queues_empty(conn));
3902
3903 if (signal_pending(current))
3904 goto transport_err;
3905
3906 get_immediate:
3907 ret = iscsit_handle_immediate_queue(conn);
3908 if (ret < 0)
3909 goto transport_err;
3910
3911 ret = iscsit_handle_response_queue(conn);
3912 if (ret == 1) {
3913 goto get_immediate;
3914 } else if (ret == -ECONNRESET) {
3915 conn_freed = true;
3916 goto out;
3917 } else if (ret < 0) {
3918 goto transport_err;
3919 }
3920 }
3921
3922 transport_err:
3923 /*
3924 * Avoid the normal connection failure code-path if this connection
3925 * is still within LOGIN mode, and iscsi_np process context is
3926 * responsible for cleaning up the early connection failure.
3927 */
3928 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3929 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3930 out:
3931 if (!conn_freed) {
3932 while (!kthread_should_stop()) {
3933 msleep(100);
3934 }
3935 }
3936 return 0;
3937 }
3938
iscsi_target_rx_opcode(struct iscsit_conn * conn,unsigned char * buf)3939 static int iscsi_target_rx_opcode(struct iscsit_conn *conn, unsigned char *buf)
3940 {
3941 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3942 struct iscsit_cmd *cmd;
3943 int ret = 0;
3944
3945 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3946 case ISCSI_OP_SCSI_CMD:
3947 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3948 if (!cmd)
3949 goto reject;
3950
3951 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3952 break;
3953 case ISCSI_OP_SCSI_DATA_OUT:
3954 ret = iscsit_handle_data_out(conn, buf);
3955 break;
3956 case ISCSI_OP_NOOP_OUT:
3957 cmd = NULL;
3958 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3959 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3960 if (!cmd)
3961 goto reject;
3962 }
3963 ret = iscsit_handle_nop_out(conn, cmd, buf);
3964 break;
3965 case ISCSI_OP_SCSI_TMFUNC:
3966 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3967 if (!cmd)
3968 goto reject;
3969
3970 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3971 break;
3972 case ISCSI_OP_TEXT:
3973 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3974 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3975 if (!cmd)
3976 goto reject;
3977 } else {
3978 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3979 if (!cmd)
3980 goto reject;
3981 }
3982
3983 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3984 break;
3985 case ISCSI_OP_LOGOUT:
3986 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3987 if (!cmd)
3988 goto reject;
3989
3990 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3991 if (ret > 0)
3992 wait_for_completion_timeout(&conn->conn_logout_comp,
3993 SECONDS_FOR_LOGOUT_COMP * HZ);
3994 break;
3995 case ISCSI_OP_SNACK:
3996 ret = iscsit_handle_snack(conn, buf);
3997 break;
3998 default:
3999 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4000 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4001 pr_err("Cannot recover from unknown"
4002 " opcode while ERL=0, closing iSCSI connection.\n");
4003 return -1;
4004 }
4005 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
4006 " closing iSCSI connection.\n");
4007 ret = -1;
4008 break;
4009 }
4010
4011 return ret;
4012 reject:
4013 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4014 }
4015
iscsi_target_check_conn_state(struct iscsit_conn * conn)4016 static bool iscsi_target_check_conn_state(struct iscsit_conn *conn)
4017 {
4018 bool ret;
4019
4020 spin_lock_bh(&conn->state_lock);
4021 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
4022 spin_unlock_bh(&conn->state_lock);
4023
4024 return ret;
4025 }
4026
iscsit_get_rx_pdu(struct iscsit_conn * conn)4027 static void iscsit_get_rx_pdu(struct iscsit_conn *conn)
4028 {
4029 int ret;
4030 u8 *buffer, *tmp_buf, opcode;
4031 u32 checksum = 0, digest = 0;
4032 struct iscsi_hdr *hdr;
4033 struct kvec iov;
4034
4035 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
4036 if (!buffer)
4037 return;
4038
4039 while (!kthread_should_stop()) {
4040 /*
4041 * Ensure that both TX and RX per connection kthreads
4042 * are scheduled to run on the same CPU.
4043 */
4044 iscsit_thread_check_cpumask(conn, current, 0);
4045
4046 memset(&iov, 0, sizeof(struct kvec));
4047
4048 iov.iov_base = buffer;
4049 iov.iov_len = ISCSI_HDR_LEN;
4050
4051 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4052 if (ret != ISCSI_HDR_LEN) {
4053 iscsit_rx_thread_wait_for_tcp(conn);
4054 break;
4055 }
4056
4057 hdr = (struct iscsi_hdr *) buffer;
4058 if (hdr->hlength) {
4059 iov.iov_len = hdr->hlength * 4;
4060 tmp_buf = krealloc(buffer,
4061 ISCSI_HDR_LEN + iov.iov_len,
4062 GFP_KERNEL);
4063 if (!tmp_buf)
4064 break;
4065
4066 buffer = tmp_buf;
4067 iov.iov_base = &buffer[ISCSI_HDR_LEN];
4068
4069 ret = rx_data(conn, &iov, 1, iov.iov_len);
4070 if (ret != iov.iov_len) {
4071 iscsit_rx_thread_wait_for_tcp(conn);
4072 break;
4073 }
4074 }
4075
4076 if (conn->conn_ops->HeaderDigest) {
4077 iov.iov_base = &digest;
4078 iov.iov_len = ISCSI_CRC_LEN;
4079
4080 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4081 if (ret != ISCSI_CRC_LEN) {
4082 iscsit_rx_thread_wait_for_tcp(conn);
4083 break;
4084 }
4085
4086 checksum = iscsit_crc_buf(buffer, ISCSI_HDR_LEN, 0,
4087 NULL);
4088 if (digest != checksum) {
4089 pr_err("HeaderDigest CRC32C failed,"
4090 " received 0x%08x, computed 0x%08x\n",
4091 digest, checksum);
4092 /*
4093 * Set the PDU to 0xff so it will intentionally
4094 * hit default in the switch below.
4095 */
4096 memset(buffer, 0xff, ISCSI_HDR_LEN);
4097 atomic_long_inc(&conn->sess->conn_digest_errors);
4098 } else {
4099 pr_debug("Got HeaderDigest CRC32C"
4100 " 0x%08x\n", checksum);
4101 }
4102 }
4103
4104 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4105 break;
4106
4107 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4108
4109 if (conn->sess->sess_ops->SessionType &&
4110 ((!(opcode & ISCSI_OP_TEXT)) ||
4111 (!(opcode & ISCSI_OP_LOGOUT)))) {
4112 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4113 " while in Discovery Session, rejecting.\n", opcode);
4114 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4115 buffer);
4116 break;
4117 }
4118
4119 ret = iscsi_target_rx_opcode(conn, buffer);
4120 if (ret < 0)
4121 break;
4122 }
4123
4124 kfree(buffer);
4125 }
4126
iscsi_target_rx_thread(void * arg)4127 int iscsi_target_rx_thread(void *arg)
4128 {
4129 int rc;
4130 struct iscsit_conn *conn = arg;
4131 bool conn_freed = false;
4132
4133 /*
4134 * Allow ourselves to be interrupted by SIGINT so that a
4135 * connection recovery / failure event can be triggered externally.
4136 */
4137 allow_signal(SIGINT);
4138 /*
4139 * Wait for iscsi_post_login_handler() to complete before allowing
4140 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4141 */
4142 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4143 if (rc < 0 || iscsi_target_check_conn_state(conn))
4144 goto out;
4145
4146 if (!conn->conn_transport->iscsit_get_rx_pdu)
4147 return 0;
4148
4149 conn->conn_transport->iscsit_get_rx_pdu(conn);
4150
4151 if (!signal_pending(current))
4152 atomic_set(&conn->transport_failed, 1);
4153 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4154
4155 out:
4156 if (!conn_freed) {
4157 while (!kthread_should_stop()) {
4158 msleep(100);
4159 }
4160 }
4161
4162 return 0;
4163 }
4164
iscsit_release_commands_from_conn(struct iscsit_conn * conn)4165 static void iscsit_release_commands_from_conn(struct iscsit_conn *conn)
4166 {
4167 LIST_HEAD(tmp_list);
4168 struct iscsit_cmd *cmd = NULL, *cmd_tmp = NULL;
4169 struct iscsit_session *sess = conn->sess;
4170 /*
4171 * We expect this function to only ever be called from either RX or TX
4172 * thread context via iscsit_close_connection() once the other context
4173 * has been reset -> returned sleeping pre-handler state.
4174 */
4175 spin_lock_bh(&conn->cmd_lock);
4176 list_splice_init(&conn->conn_cmd_list, &tmp_list);
4177
4178 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4179 struct se_cmd *se_cmd = &cmd->se_cmd;
4180
4181 if (!se_cmd->se_tfo)
4182 continue;
4183
4184 spin_lock_irq(&se_cmd->t_state_lock);
4185 if (se_cmd->transport_state & CMD_T_ABORTED) {
4186 if (!(se_cmd->transport_state & CMD_T_TAS))
4187 /*
4188 * LIO's abort path owns the cleanup for this,
4189 * so put it back on the list and let
4190 * aborted_task handle it.
4191 */
4192 list_move_tail(&cmd->i_conn_node,
4193 &conn->conn_cmd_list);
4194 } else {
4195 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4196 }
4197
4198 if (cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
4199 /*
4200 * We never submitted the cmd to LIO core, so we have
4201 * to tell LIO to perform the completion process.
4202 */
4203 spin_unlock_irq(&se_cmd->t_state_lock);
4204 target_complete_cmd(&cmd->se_cmd, SAM_STAT_TASK_ABORTED);
4205 continue;
4206 }
4207 spin_unlock_irq(&se_cmd->t_state_lock);
4208 }
4209 spin_unlock_bh(&conn->cmd_lock);
4210
4211 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4212 list_del_init(&cmd->i_conn_node);
4213
4214 iscsit_increment_maxcmdsn(cmd, sess);
4215 iscsit_free_cmd(cmd, true);
4216
4217 }
4218
4219 /*
4220 * Wait on commands that were cleaned up via the aborted_task path.
4221 * LLDs that implement iscsit_wait_conn will already have waited for
4222 * commands.
4223 */
4224 if (!conn->conn_transport->iscsit_wait_conn) {
4225 target_stop_cmd_counter(conn->cmd_cnt);
4226 target_wait_for_cmds(conn->cmd_cnt);
4227 }
4228 }
4229
iscsit_stop_timers_for_cmds(struct iscsit_conn * conn)4230 static void iscsit_stop_timers_for_cmds(
4231 struct iscsit_conn *conn)
4232 {
4233 struct iscsit_cmd *cmd;
4234
4235 spin_lock_bh(&conn->cmd_lock);
4236 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4237 if (cmd->data_direction == DMA_TO_DEVICE)
4238 iscsit_stop_dataout_timer(cmd);
4239 }
4240 spin_unlock_bh(&conn->cmd_lock);
4241 }
4242
iscsit_close_connection(struct iscsit_conn * conn)4243 int iscsit_close_connection(
4244 struct iscsit_conn *conn)
4245 {
4246 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4247 struct iscsit_session *sess = conn->sess;
4248
4249 pr_debug("Closing iSCSI connection CID %hu on SID:"
4250 " %u\n", conn->cid, sess->sid);
4251 /*
4252 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4253 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4254 * sleeping and the logout response never got sent because the
4255 * connection failed.
4256 *
4257 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4258 * to signal logout response TX interrupt completion. Go ahead and skip
4259 * this for iser since isert_rx_opcode() does not wait on logout failure,
4260 * and to avoid iscsit_conn pointer dereference in iser-target code.
4261 */
4262 if (!conn->conn_transport->rdma_shutdown)
4263 complete(&conn->conn_logout_comp);
4264
4265 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4266 if (conn->tx_thread &&
4267 cmpxchg(&conn->tx_thread_active, true, false)) {
4268 send_sig(SIGINT, conn->tx_thread, 1);
4269 kthread_stop(conn->tx_thread);
4270 }
4271 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4272 if (conn->rx_thread &&
4273 cmpxchg(&conn->rx_thread_active, true, false)) {
4274 send_sig(SIGINT, conn->rx_thread, 1);
4275 kthread_stop(conn->rx_thread);
4276 }
4277 }
4278
4279 spin_lock(&iscsit_global->ts_bitmap_lock);
4280 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4281 get_order(1));
4282 spin_unlock(&iscsit_global->ts_bitmap_lock);
4283
4284 iscsit_stop_timers_for_cmds(conn);
4285 iscsit_stop_nopin_timer(conn);
4286 iscsit_stop_nopin_response_timer(conn);
4287
4288 if (conn->conn_transport->iscsit_wait_conn)
4289 conn->conn_transport->iscsit_wait_conn(conn);
4290
4291 /*
4292 * During Connection recovery drop unacknowledged out of order
4293 * commands for this connection, and prepare the other commands
4294 * for reallegiance.
4295 *
4296 * During normal operation clear the out of order commands (but
4297 * do not free the struct iscsi_ooo_cmdsn's) and release all
4298 * struct iscsit_cmds.
4299 */
4300 if (atomic_read(&conn->connection_recovery)) {
4301 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4302 iscsit_prepare_cmds_for_reallegiance(conn);
4303 } else {
4304 iscsit_clear_ooo_cmdsns_for_conn(conn);
4305 iscsit_release_commands_from_conn(conn);
4306 }
4307 iscsit_free_queue_reqs_for_conn(conn);
4308
4309 /*
4310 * Handle decrementing session or connection usage count if
4311 * a logout response was not able to be sent because the
4312 * connection failed. Fall back to Session Recovery here.
4313 */
4314 if (atomic_read(&conn->conn_logout_remove)) {
4315 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4316 iscsit_dec_conn_usage_count(conn);
4317 iscsit_dec_session_usage_count(sess);
4318 }
4319 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4320 iscsit_dec_conn_usage_count(conn);
4321
4322 atomic_set(&conn->conn_logout_remove, 0);
4323 atomic_set(&sess->session_reinstatement, 0);
4324 atomic_set(&sess->session_fall_back_to_erl0, 1);
4325 }
4326
4327 spin_lock_bh(&sess->conn_lock);
4328 list_del(&conn->conn_list);
4329
4330 /*
4331 * Attempt to let the Initiator know this connection failed by
4332 * sending an Connection Dropped Async Message on another
4333 * active connection.
4334 */
4335 if (atomic_read(&conn->connection_recovery))
4336 iscsit_build_conn_drop_async_message(conn);
4337
4338 spin_unlock_bh(&sess->conn_lock);
4339
4340 /*
4341 * If connection reinstatement is being performed on this connection,
4342 * up the connection reinstatement semaphore that is being blocked on
4343 * in iscsit_cause_connection_reinstatement().
4344 */
4345 spin_lock_bh(&conn->state_lock);
4346 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4347 spin_unlock_bh(&conn->state_lock);
4348 complete(&conn->conn_wait_comp);
4349 wait_for_completion(&conn->conn_post_wait_comp);
4350 spin_lock_bh(&conn->state_lock);
4351 }
4352
4353 /*
4354 * If connection reinstatement is being performed on this connection
4355 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4356 * connection wait rcfr semaphore that is being blocked on
4357 * an iscsit_connection_reinstatement_rcfr().
4358 */
4359 if (atomic_read(&conn->connection_wait_rcfr)) {
4360 spin_unlock_bh(&conn->state_lock);
4361 complete(&conn->conn_wait_rcfr_comp);
4362 wait_for_completion(&conn->conn_post_wait_comp);
4363 spin_lock_bh(&conn->state_lock);
4364 }
4365 atomic_set(&conn->connection_reinstatement, 1);
4366 spin_unlock_bh(&conn->state_lock);
4367
4368 /*
4369 * If any other processes are accessing this connection pointer we
4370 * must wait until they have completed.
4371 */
4372 iscsit_check_conn_usage_count(conn);
4373
4374 if (conn->sock)
4375 sock_release(conn->sock);
4376
4377 if (conn->conn_transport->iscsit_free_conn)
4378 conn->conn_transport->iscsit_free_conn(conn);
4379
4380 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4381 conn->conn_state = TARG_CONN_STATE_FREE;
4382 iscsit_free_conn(conn);
4383
4384 spin_lock_bh(&sess->conn_lock);
4385 atomic_dec(&sess->nconn);
4386 pr_debug("Decremented iSCSI connection count to %d from node:"
4387 " %s\n", atomic_read(&sess->nconn),
4388 sess->sess_ops->InitiatorName);
4389 /*
4390 * Make sure that if one connection fails in an non ERL=2 iSCSI
4391 * Session that they all fail.
4392 */
4393 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4394 !atomic_read(&sess->session_logout))
4395 atomic_set(&sess->session_fall_back_to_erl0, 1);
4396
4397 /*
4398 * If this was not the last connection in the session, and we are
4399 * performing session reinstatement or falling back to ERL=0, call
4400 * iscsit_stop_session() without sleeping to shutdown the other
4401 * active connections.
4402 */
4403 if (atomic_read(&sess->nconn)) {
4404 if (!atomic_read(&sess->session_reinstatement) &&
4405 !atomic_read(&sess->session_fall_back_to_erl0)) {
4406 spin_unlock_bh(&sess->conn_lock);
4407 return 0;
4408 }
4409 if (!atomic_read(&sess->session_stop_active)) {
4410 atomic_set(&sess->session_stop_active, 1);
4411 spin_unlock_bh(&sess->conn_lock);
4412 iscsit_stop_session(sess, 0, 0);
4413 return 0;
4414 }
4415 spin_unlock_bh(&sess->conn_lock);
4416 return 0;
4417 }
4418
4419 /*
4420 * If this was the last connection in the session and one of the
4421 * following is occurring:
4422 *
4423 * Session Reinstatement is not being performed, and are falling back
4424 * to ERL=0 call iscsit_close_session().
4425 *
4426 * Session Logout was requested. iscsit_close_session() will be called
4427 * elsewhere.
4428 *
4429 * Session Continuation is not being performed, start the Time2Retain
4430 * handler and check if sleep_on_sess_wait_sem is active.
4431 */
4432 if (!atomic_read(&sess->session_reinstatement) &&
4433 atomic_read(&sess->session_fall_back_to_erl0)) {
4434 spin_unlock_bh(&sess->conn_lock);
4435 complete_all(&sess->session_wait_comp);
4436 iscsit_close_session(sess, true);
4437
4438 return 0;
4439 } else if (atomic_read(&sess->session_logout)) {
4440 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4441 sess->session_state = TARG_SESS_STATE_FREE;
4442
4443 if (atomic_read(&sess->session_close)) {
4444 spin_unlock_bh(&sess->conn_lock);
4445 complete_all(&sess->session_wait_comp);
4446 iscsit_close_session(sess, true);
4447 } else {
4448 spin_unlock_bh(&sess->conn_lock);
4449 }
4450
4451 return 0;
4452 } else {
4453 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4454 sess->session_state = TARG_SESS_STATE_FAILED;
4455
4456 if (!atomic_read(&sess->session_continuation))
4457 iscsit_start_time2retain_handler(sess);
4458
4459 if (atomic_read(&sess->session_close)) {
4460 spin_unlock_bh(&sess->conn_lock);
4461 complete_all(&sess->session_wait_comp);
4462 iscsit_close_session(sess, true);
4463 } else {
4464 spin_unlock_bh(&sess->conn_lock);
4465 }
4466
4467 return 0;
4468 }
4469 }
4470
4471 /*
4472 * If the iSCSI Session for the iSCSI Initiator Node exists,
4473 * forcefully shutdown the iSCSI NEXUS.
4474 */
iscsit_close_session(struct iscsit_session * sess,bool can_sleep)4475 int iscsit_close_session(struct iscsit_session *sess, bool can_sleep)
4476 {
4477 struct iscsi_portal_group *tpg = sess->tpg;
4478 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4479
4480 if (atomic_read(&sess->nconn)) {
4481 pr_err("%d connection(s) still exist for iSCSI session"
4482 " to %s\n", atomic_read(&sess->nconn),
4483 sess->sess_ops->InitiatorName);
4484 BUG();
4485 }
4486
4487 spin_lock_bh(&se_tpg->session_lock);
4488 atomic_set(&sess->session_logout, 1);
4489 atomic_set(&sess->session_reinstatement, 1);
4490 iscsit_stop_time2retain_timer(sess);
4491 spin_unlock_bh(&se_tpg->session_lock);
4492
4493 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4494 iscsit_free_connection_recovery_entries(sess);
4495
4496 /*
4497 * transport_deregister_session_configfs() will clear the
4498 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4499 * can be setting it again with __transport_register_session() in
4500 * iscsi_post_login_handler() again after the iscsit_stop_session()
4501 * completes in iscsi_np context.
4502 */
4503 transport_deregister_session_configfs(sess->se_sess);
4504
4505 /*
4506 * If any other processes are accessing this session pointer we must
4507 * wait until they have completed. If we are in an interrupt (the
4508 * time2retain handler) and contain and active session usage count we
4509 * restart the timer and exit.
4510 */
4511 if (iscsit_check_session_usage_count(sess, can_sleep)) {
4512 atomic_set(&sess->session_logout, 0);
4513 iscsit_start_time2retain_handler(sess);
4514 return 0;
4515 }
4516
4517 transport_deregister_session(sess->se_sess);
4518
4519 iscsit_free_all_ooo_cmdsns(sess);
4520
4521 spin_lock_bh(&se_tpg->session_lock);
4522 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4523 sess->session_state = TARG_SESS_STATE_FREE;
4524 pr_debug("Released iSCSI session from node: %s\n",
4525 sess->sess_ops->InitiatorName);
4526 tpg->nsessions--;
4527 if (tpg->tpg_tiqn)
4528 tpg->tpg_tiqn->tiqn_nsessions--;
4529
4530 pr_debug("Decremented number of active iSCSI Sessions on"
4531 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4532
4533 ida_free(&sess_ida, sess->session_index);
4534 kfree(sess->sess_ops);
4535 sess->sess_ops = NULL;
4536 spin_unlock_bh(&se_tpg->session_lock);
4537
4538 kfree(sess);
4539 return 0;
4540 }
4541
iscsit_logout_post_handler_closesession(struct iscsit_conn * conn)4542 static void iscsit_logout_post_handler_closesession(
4543 struct iscsit_conn *conn)
4544 {
4545 struct iscsit_session *sess = conn->sess;
4546 int sleep = 1;
4547 /*
4548 * Traditional iscsi/tcp will invoke this logic from TX thread
4549 * context during session logout, so clear tx_thread_active and
4550 * sleep if iscsit_close_connection() has not already occured.
4551 *
4552 * Since iser-target invokes this logic from it's own workqueue,
4553 * always sleep waiting for RX/TX thread shutdown to complete
4554 * within iscsit_close_connection().
4555 */
4556 if (!conn->conn_transport->rdma_shutdown) {
4557 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4558 if (!sleep)
4559 return;
4560 }
4561
4562 atomic_set(&conn->conn_logout_remove, 0);
4563 complete(&conn->conn_logout_comp);
4564
4565 iscsit_dec_conn_usage_count(conn);
4566 atomic_set(&sess->session_close, 1);
4567 iscsit_stop_session(sess, sleep, sleep);
4568 iscsit_dec_session_usage_count(sess);
4569 }
4570
iscsit_logout_post_handler_samecid(struct iscsit_conn * conn)4571 static void iscsit_logout_post_handler_samecid(
4572 struct iscsit_conn *conn)
4573 {
4574 int sleep = 1;
4575
4576 if (!conn->conn_transport->rdma_shutdown) {
4577 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4578 if (!sleep)
4579 return;
4580 }
4581
4582 atomic_set(&conn->conn_logout_remove, 0);
4583 complete(&conn->conn_logout_comp);
4584
4585 iscsit_cause_connection_reinstatement(conn, sleep);
4586 iscsit_dec_conn_usage_count(conn);
4587 }
4588
iscsit_logout_post_handler_diffcid(struct iscsit_conn * conn,u16 cid)4589 static void iscsit_logout_post_handler_diffcid(
4590 struct iscsit_conn *conn,
4591 u16 cid)
4592 {
4593 struct iscsit_conn *l_conn;
4594 struct iscsit_session *sess = conn->sess;
4595 bool conn_found = false;
4596
4597 if (!sess)
4598 return;
4599
4600 spin_lock_bh(&sess->conn_lock);
4601 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4602 if (l_conn->cid == cid) {
4603 iscsit_inc_conn_usage_count(l_conn);
4604 conn_found = true;
4605 break;
4606 }
4607 }
4608 spin_unlock_bh(&sess->conn_lock);
4609
4610 if (!conn_found)
4611 return;
4612
4613 if (l_conn->sock)
4614 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4615
4616 spin_lock_bh(&l_conn->state_lock);
4617 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4618 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4619 spin_unlock_bh(&l_conn->state_lock);
4620
4621 iscsit_cause_connection_reinstatement(l_conn, 1);
4622 iscsit_dec_conn_usage_count(l_conn);
4623 }
4624
4625 /*
4626 * Return of 0 causes the TX thread to restart.
4627 */
iscsit_logout_post_handler(struct iscsit_cmd * cmd,struct iscsit_conn * conn)4628 int iscsit_logout_post_handler(
4629 struct iscsit_cmd *cmd,
4630 struct iscsit_conn *conn)
4631 {
4632 int ret = 0;
4633
4634 switch (cmd->logout_reason) {
4635 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4636 switch (cmd->logout_response) {
4637 case ISCSI_LOGOUT_SUCCESS:
4638 case ISCSI_LOGOUT_CLEANUP_FAILED:
4639 default:
4640 iscsit_logout_post_handler_closesession(conn);
4641 break;
4642 }
4643 break;
4644 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4645 if (conn->cid == cmd->logout_cid) {
4646 switch (cmd->logout_response) {
4647 case ISCSI_LOGOUT_SUCCESS:
4648 case ISCSI_LOGOUT_CLEANUP_FAILED:
4649 default:
4650 iscsit_logout_post_handler_samecid(conn);
4651 break;
4652 }
4653 } else {
4654 switch (cmd->logout_response) {
4655 case ISCSI_LOGOUT_SUCCESS:
4656 iscsit_logout_post_handler_diffcid(conn,
4657 cmd->logout_cid);
4658 break;
4659 case ISCSI_LOGOUT_CID_NOT_FOUND:
4660 case ISCSI_LOGOUT_CLEANUP_FAILED:
4661 default:
4662 break;
4663 }
4664 ret = 1;
4665 }
4666 break;
4667 case ISCSI_LOGOUT_REASON_RECOVERY:
4668 switch (cmd->logout_response) {
4669 case ISCSI_LOGOUT_SUCCESS:
4670 case ISCSI_LOGOUT_CID_NOT_FOUND:
4671 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4672 case ISCSI_LOGOUT_CLEANUP_FAILED:
4673 default:
4674 break;
4675 }
4676 ret = 1;
4677 break;
4678 default:
4679 break;
4680
4681 }
4682 return ret;
4683 }
4684 EXPORT_SYMBOL(iscsit_logout_post_handler);
4685
iscsit_stop_session(struct iscsit_session * sess,int session_sleep,int connection_sleep)4686 void iscsit_stop_session(
4687 struct iscsit_session *sess,
4688 int session_sleep,
4689 int connection_sleep)
4690 {
4691 u16 conn_count = atomic_read(&sess->nconn);
4692 struct iscsit_conn *conn, *conn_tmp = NULL;
4693 int is_last;
4694
4695 spin_lock_bh(&sess->conn_lock);
4696
4697 if (connection_sleep) {
4698 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4699 conn_list) {
4700 if (conn_count == 0)
4701 break;
4702
4703 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4704 is_last = 1;
4705 } else {
4706 iscsit_inc_conn_usage_count(conn_tmp);
4707 is_last = 0;
4708 }
4709 iscsit_inc_conn_usage_count(conn);
4710
4711 spin_unlock_bh(&sess->conn_lock);
4712 iscsit_cause_connection_reinstatement(conn, 1);
4713 spin_lock_bh(&sess->conn_lock);
4714
4715 iscsit_dec_conn_usage_count(conn);
4716 if (is_last == 0)
4717 iscsit_dec_conn_usage_count(conn_tmp);
4718 conn_count--;
4719 }
4720 } else {
4721 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4722 iscsit_cause_connection_reinstatement(conn, 0);
4723 }
4724
4725 if (session_sleep && atomic_read(&sess->nconn)) {
4726 spin_unlock_bh(&sess->conn_lock);
4727 wait_for_completion(&sess->session_wait_comp);
4728 } else
4729 spin_unlock_bh(&sess->conn_lock);
4730 }
4731
iscsit_release_sessions_for_tpg(struct iscsi_portal_group * tpg,int force)4732 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4733 {
4734 struct iscsit_session *sess;
4735 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4736 struct se_session *se_sess, *se_sess_tmp;
4737 LIST_HEAD(free_list);
4738 int session_count = 0;
4739
4740 spin_lock_bh(&se_tpg->session_lock);
4741 if (tpg->nsessions && !force) {
4742 spin_unlock_bh(&se_tpg->session_lock);
4743 return -1;
4744 }
4745
4746 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4747 sess_list) {
4748 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr;
4749
4750 spin_lock(&sess->conn_lock);
4751 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4752 atomic_read(&sess->session_logout) ||
4753 atomic_read(&sess->session_close) ||
4754 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4755 spin_unlock(&sess->conn_lock);
4756 continue;
4757 }
4758 iscsit_inc_session_usage_count(sess);
4759 atomic_set(&sess->session_reinstatement, 1);
4760 atomic_set(&sess->session_fall_back_to_erl0, 1);
4761 atomic_set(&sess->session_close, 1);
4762 spin_unlock(&sess->conn_lock);
4763
4764 list_move_tail(&se_sess->sess_list, &free_list);
4765 }
4766 spin_unlock_bh(&se_tpg->session_lock);
4767
4768 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4769 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr;
4770
4771 list_del_init(&se_sess->sess_list);
4772 iscsit_stop_session(sess, 1, 1);
4773 iscsit_dec_session_usage_count(sess);
4774 session_count++;
4775 }
4776
4777 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4778 " Group: %hu\n", session_count, tpg->tpgt);
4779 return 0;
4780 }
4781
4782 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4783 MODULE_VERSION("4.1.x");
4784 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4785 MODULE_LICENSE("GPL");
4786
4787 module_init(iscsi_target_init_module);
4788 module_exit(iscsi_target_cleanup_module);
4789