tcmu: Add a missing unlock on an error path
[muen/linux.git] / drivers / target / iscsi / iscsi_target.c
1 /*******************************************************************************
2  * This file contains main functions related to the iSCSI Target Core Driver.
3  *
4  * (c) Copyright 2007-2013 Datera, Inc.
5  *
6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  ******************************************************************************/
18
19 #include <crypto/hash.h>
20 #include <linux/string.h>
21 #include <linux/kthread.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
25 #include <linux/idr.h>
26 #include <linux/delay.h>
27 #include <linux/sched/signal.h>
28 #include <asm/unaligned.h>
29 #include <net/ipv6.h>
30 #include <scsi/scsi_proto.h>
31 #include <scsi/iscsi_proto.h>
32 #include <scsi/scsi_tcq.h>
33 #include <target/target_core_base.h>
34 #include <target/target_core_fabric.h>
35
36 #include <target/iscsi/iscsi_target_core.h>
37 #include "iscsi_target_parameters.h"
38 #include "iscsi_target_seq_pdu_list.h"
39 #include "iscsi_target_datain_values.h"
40 #include "iscsi_target_erl0.h"
41 #include "iscsi_target_erl1.h"
42 #include "iscsi_target_erl2.h"
43 #include "iscsi_target_login.h"
44 #include "iscsi_target_tmr.h"
45 #include "iscsi_target_tpg.h"
46 #include "iscsi_target_util.h"
47 #include "iscsi_target.h"
48 #include "iscsi_target_device.h"
49 #include <target/iscsi/iscsi_target_stat.h>
50
51 #include <target/iscsi/iscsi_transport.h>
52
53 static LIST_HEAD(g_tiqn_list);
54 static LIST_HEAD(g_np_list);
55 static DEFINE_SPINLOCK(tiqn_lock);
56 static DEFINE_MUTEX(np_lock);
57
58 static struct idr tiqn_idr;
59 struct idr sess_idr;
60 struct mutex auth_id_lock;
61 spinlock_t sess_idr_lock;
62
63 struct iscsit_global *iscsit_global;
64
65 struct kmem_cache *lio_qr_cache;
66 struct kmem_cache *lio_dr_cache;
67 struct kmem_cache *lio_ooo_cache;
68 struct kmem_cache *lio_r2t_cache;
69
70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
71                         struct iscsi_scsi_req *, u32);
72
73 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
74 {
75         struct iscsi_tiqn *tiqn = NULL;
76
77         spin_lock(&tiqn_lock);
78         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
79                 if (!strcmp(tiqn->tiqn, buf)) {
80
81                         spin_lock(&tiqn->tiqn_state_lock);
82                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
83                                 tiqn->tiqn_access_count++;
84                                 spin_unlock(&tiqn->tiqn_state_lock);
85                                 spin_unlock(&tiqn_lock);
86                                 return tiqn;
87                         }
88                         spin_unlock(&tiqn->tiqn_state_lock);
89                 }
90         }
91         spin_unlock(&tiqn_lock);
92
93         return NULL;
94 }
95
96 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
97 {
98         spin_lock(&tiqn->tiqn_state_lock);
99         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
100                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
101                 spin_unlock(&tiqn->tiqn_state_lock);
102                 return 0;
103         }
104         spin_unlock(&tiqn->tiqn_state_lock);
105
106         return -1;
107 }
108
109 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
110 {
111         spin_lock(&tiqn->tiqn_state_lock);
112         tiqn->tiqn_access_count--;
113         spin_unlock(&tiqn->tiqn_state_lock);
114 }
115
116 /*
117  * Note that IQN formatting is expected to be done in userspace, and
118  * no explict IQN format checks are done here.
119  */
120 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
121 {
122         struct iscsi_tiqn *tiqn = NULL;
123         int ret;
124
125         if (strlen(buf) >= ISCSI_IQN_LEN) {
126                 pr_err("Target IQN exceeds %d bytes\n",
127                                 ISCSI_IQN_LEN);
128                 return ERR_PTR(-EINVAL);
129         }
130
131         tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
132         if (!tiqn)
133                 return ERR_PTR(-ENOMEM);
134
135         sprintf(tiqn->tiqn, "%s", buf);
136         INIT_LIST_HEAD(&tiqn->tiqn_list);
137         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
138         spin_lock_init(&tiqn->tiqn_state_lock);
139         spin_lock_init(&tiqn->tiqn_tpg_lock);
140         spin_lock_init(&tiqn->sess_err_stats.lock);
141         spin_lock_init(&tiqn->login_stats.lock);
142         spin_lock_init(&tiqn->logout_stats.lock);
143
144         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
145
146         idr_preload(GFP_KERNEL);
147         spin_lock(&tiqn_lock);
148
149         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
150         if (ret < 0) {
151                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
152                 spin_unlock(&tiqn_lock);
153                 idr_preload_end();
154                 kfree(tiqn);
155                 return ERR_PTR(ret);
156         }
157         tiqn->tiqn_index = ret;
158         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
159
160         spin_unlock(&tiqn_lock);
161         idr_preload_end();
162
163         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
164
165         return tiqn;
166
167 }
168
169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
170 {
171         /*
172          * Wait for accesses to said struct iscsi_tiqn to end.
173          */
174         spin_lock(&tiqn->tiqn_state_lock);
175         while (tiqn->tiqn_access_count != 0) {
176                 spin_unlock(&tiqn->tiqn_state_lock);
177                 msleep(10);
178                 spin_lock(&tiqn->tiqn_state_lock);
179         }
180         spin_unlock(&tiqn->tiqn_state_lock);
181 }
182
183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
184 {
185         /*
186          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
187          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
188          * attempts to access this struct iscsi_tiqn will fail from both transport
189          * fabric and control code paths.
190          */
191         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
192                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
193                 return;
194         }
195
196         iscsit_wait_for_tiqn(tiqn);
197
198         spin_lock(&tiqn_lock);
199         list_del(&tiqn->tiqn_list);
200         idr_remove(&tiqn_idr, tiqn->tiqn_index);
201         spin_unlock(&tiqn_lock);
202
203         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
204                         tiqn->tiqn);
205         kfree(tiqn);
206 }
207
208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
209 {
210         int ret;
211         /*
212          * Determine if the network portal is accepting storage traffic.
213          */
214         spin_lock_bh(&np->np_thread_lock);
215         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
216                 spin_unlock_bh(&np->np_thread_lock);
217                 return -1;
218         }
219         spin_unlock_bh(&np->np_thread_lock);
220         /*
221          * Determine if the portal group is accepting storage traffic.
222          */
223         spin_lock_bh(&tpg->tpg_state_lock);
224         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
225                 spin_unlock_bh(&tpg->tpg_state_lock);
226                 return -1;
227         }
228         spin_unlock_bh(&tpg->tpg_state_lock);
229
230         /*
231          * Here we serialize access across the TIQN+TPG Tuple.
232          */
233         ret = down_interruptible(&tpg->np_login_sem);
234         if (ret != 0)
235                 return -1;
236
237         spin_lock_bh(&tpg->tpg_state_lock);
238         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
239                 spin_unlock_bh(&tpg->tpg_state_lock);
240                 up(&tpg->np_login_sem);
241                 return -1;
242         }
243         spin_unlock_bh(&tpg->tpg_state_lock);
244
245         return 0;
246 }
247
248 void iscsit_login_kref_put(struct kref *kref)
249 {
250         struct iscsi_tpg_np *tpg_np = container_of(kref,
251                                 struct iscsi_tpg_np, tpg_np_kref);
252
253         complete(&tpg_np->tpg_np_comp);
254 }
255
256 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
257                        struct iscsi_tpg_np *tpg_np)
258 {
259         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
260
261         up(&tpg->np_login_sem);
262
263         if (tpg_np)
264                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
265
266         if (tiqn)
267                 iscsit_put_tiqn_for_login(tiqn);
268
269         return 0;
270 }
271
272 bool iscsit_check_np_match(
273         struct sockaddr_storage *sockaddr,
274         struct iscsi_np *np,
275         int network_transport)
276 {
277         struct sockaddr_in *sock_in, *sock_in_e;
278         struct sockaddr_in6 *sock_in6, *sock_in6_e;
279         bool ip_match = false;
280         u16 port, port_e;
281
282         if (sockaddr->ss_family == AF_INET6) {
283                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
284                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
285
286                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
287                             &sock_in6_e->sin6_addr.in6_u,
288                             sizeof(struct in6_addr)))
289                         ip_match = true;
290
291                 port = ntohs(sock_in6->sin6_port);
292                 port_e = ntohs(sock_in6_e->sin6_port);
293         } else {
294                 sock_in = (struct sockaddr_in *)sockaddr;
295                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
296
297                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
298                         ip_match = true;
299
300                 port = ntohs(sock_in->sin_port);
301                 port_e = ntohs(sock_in_e->sin_port);
302         }
303
304         if (ip_match && (port_e == port) &&
305             (np->np_network_transport == network_transport))
306                 return true;
307
308         return false;
309 }
310
311 /*
312  * Called with mutex np_lock held
313  */
314 static struct iscsi_np *iscsit_get_np(
315         struct sockaddr_storage *sockaddr,
316         int network_transport)
317 {
318         struct iscsi_np *np;
319         bool match;
320
321         list_for_each_entry(np, &g_np_list, np_list) {
322                 spin_lock_bh(&np->np_thread_lock);
323                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
324                         spin_unlock_bh(&np->np_thread_lock);
325                         continue;
326                 }
327
328                 match = iscsit_check_np_match(sockaddr, np, network_transport);
329                 if (match) {
330                         /*
331                          * Increment the np_exports reference count now to
332                          * prevent iscsit_del_np() below from being called
333                          * while iscsi_tpg_add_network_portal() is called.
334                          */
335                         np->np_exports++;
336                         spin_unlock_bh(&np->np_thread_lock);
337                         return np;
338                 }
339                 spin_unlock_bh(&np->np_thread_lock);
340         }
341
342         return NULL;
343 }
344
345 struct iscsi_np *iscsit_add_np(
346         struct sockaddr_storage *sockaddr,
347         int network_transport)
348 {
349         struct iscsi_np *np;
350         int ret;
351
352         mutex_lock(&np_lock);
353
354         /*
355          * Locate the existing struct iscsi_np if already active..
356          */
357         np = iscsit_get_np(sockaddr, network_transport);
358         if (np) {
359                 mutex_unlock(&np_lock);
360                 return np;
361         }
362
363         np = kzalloc(sizeof(*np), GFP_KERNEL);
364         if (!np) {
365                 mutex_unlock(&np_lock);
366                 return ERR_PTR(-ENOMEM);
367         }
368
369         np->np_flags |= NPF_IP_NETWORK;
370         np->np_network_transport = network_transport;
371         spin_lock_init(&np->np_thread_lock);
372         init_completion(&np->np_restart_comp);
373         INIT_LIST_HEAD(&np->np_list);
374
375         ret = iscsi_target_setup_login_socket(np, sockaddr);
376         if (ret != 0) {
377                 kfree(np);
378                 mutex_unlock(&np_lock);
379                 return ERR_PTR(ret);
380         }
381
382         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
383         if (IS_ERR(np->np_thread)) {
384                 pr_err("Unable to create kthread: iscsi_np\n");
385                 ret = PTR_ERR(np->np_thread);
386                 kfree(np);
387                 mutex_unlock(&np_lock);
388                 return ERR_PTR(ret);
389         }
390         /*
391          * Increment the np_exports reference count now to prevent
392          * iscsit_del_np() below from being run while a new call to
393          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
394          * active.  We don't need to hold np->np_thread_lock at this
395          * point because iscsi_np has not been added to g_np_list yet.
396          */
397         np->np_exports = 1;
398         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
399
400         list_add_tail(&np->np_list, &g_np_list);
401         mutex_unlock(&np_lock);
402
403         pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
404                 &np->np_sockaddr, np->np_transport->name);
405
406         return np;
407 }
408
409 int iscsit_reset_np_thread(
410         struct iscsi_np *np,
411         struct iscsi_tpg_np *tpg_np,
412         struct iscsi_portal_group *tpg,
413         bool shutdown)
414 {
415         spin_lock_bh(&np->np_thread_lock);
416         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
417                 spin_unlock_bh(&np->np_thread_lock);
418                 return 0;
419         }
420         np->np_thread_state = ISCSI_NP_THREAD_RESET;
421         atomic_inc(&np->np_reset_count);
422
423         if (np->np_thread) {
424                 spin_unlock_bh(&np->np_thread_lock);
425                 send_sig(SIGINT, np->np_thread, 1);
426                 wait_for_completion(&np->np_restart_comp);
427                 spin_lock_bh(&np->np_thread_lock);
428         }
429         spin_unlock_bh(&np->np_thread_lock);
430
431         if (tpg_np && shutdown) {
432                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
433
434                 wait_for_completion(&tpg_np->tpg_np_comp);
435         }
436
437         return 0;
438 }
439
440 static void iscsit_free_np(struct iscsi_np *np)
441 {
442         if (np->np_socket)
443                 sock_release(np->np_socket);
444 }
445
446 int iscsit_del_np(struct iscsi_np *np)
447 {
448         spin_lock_bh(&np->np_thread_lock);
449         np->np_exports--;
450         if (np->np_exports) {
451                 np->enabled = true;
452                 spin_unlock_bh(&np->np_thread_lock);
453                 return 0;
454         }
455         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
456         spin_unlock_bh(&np->np_thread_lock);
457
458         if (np->np_thread) {
459                 /*
460                  * We need to send the signal to wakeup Linux/Net
461                  * which may be sleeping in sock_accept()..
462                  */
463                 send_sig(SIGINT, np->np_thread, 1);
464                 kthread_stop(np->np_thread);
465                 np->np_thread = NULL;
466         }
467
468         np->np_transport->iscsit_free_np(np);
469
470         mutex_lock(&np_lock);
471         list_del(&np->np_list);
472         mutex_unlock(&np_lock);
473
474         pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
475                 &np->np_sockaddr, np->np_transport->name);
476
477         iscsit_put_transport(np->np_transport);
478         kfree(np);
479         return 0;
480 }
481
482 static void iscsit_get_rx_pdu(struct iscsi_conn *);
483
484 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
485 {
486         return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
487 }
488 EXPORT_SYMBOL(iscsit_queue_rsp);
489
490 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
491 {
492         spin_lock_bh(&conn->cmd_lock);
493         if (!list_empty(&cmd->i_conn_node) &&
494             !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
495                 list_del_init(&cmd->i_conn_node);
496         spin_unlock_bh(&conn->cmd_lock);
497
498         __iscsit_free_cmd(cmd, true);
499 }
500 EXPORT_SYMBOL(iscsit_aborted_task);
501
502 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
503                                       u32, u32, const void *, void *);
504 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
505
506 static int
507 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
508                           const void *data_buf, u32 data_buf_len)
509 {
510         struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
511         struct kvec *iov;
512         u32 niov = 0, tx_size = ISCSI_HDR_LEN;
513         int ret;
514
515         iov = &cmd->iov_misc[0];
516         iov[niov].iov_base      = cmd->pdu;
517         iov[niov++].iov_len     = ISCSI_HDR_LEN;
518
519         if (conn->conn_ops->HeaderDigest) {
520                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
521
522                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
523                                           ISCSI_HDR_LEN, 0, NULL,
524                                           header_digest);
525
526                 iov[0].iov_len += ISCSI_CRC_LEN;
527                 tx_size += ISCSI_CRC_LEN;
528                 pr_debug("Attaching CRC32C HeaderDigest"
529                          " to opcode 0x%x 0x%08x\n",
530                          hdr->opcode, *header_digest);
531         }
532
533         if (data_buf_len) {
534                 u32 padding = ((-data_buf_len) & 3);
535
536                 iov[niov].iov_base      = (void *)data_buf;
537                 iov[niov++].iov_len     = data_buf_len;
538                 tx_size += data_buf_len;
539
540                 if (padding != 0) {
541                         iov[niov].iov_base = &cmd->pad_bytes;
542                         iov[niov++].iov_len = padding;
543                         tx_size += padding;
544                         pr_debug("Attaching %u additional"
545                                  " padding bytes.\n", padding);
546                 }
547
548                 if (conn->conn_ops->DataDigest) {
549                         iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
550                                                   data_buf, data_buf_len,
551                                                   padding, &cmd->pad_bytes,
552                                                   &cmd->data_crc);
553
554                         iov[niov].iov_base = &cmd->data_crc;
555                         iov[niov++].iov_len = ISCSI_CRC_LEN;
556                         tx_size += ISCSI_CRC_LEN;
557                         pr_debug("Attached DataDigest for %u"
558                                  " bytes opcode 0x%x, CRC 0x%08x\n",
559                                  data_buf_len, hdr->opcode, cmd->data_crc);
560                 }
561         }
562
563         cmd->iov_misc_count = niov;
564         cmd->tx_size = tx_size;
565
566         ret = iscsit_send_tx_data(cmd, conn, 1);
567         if (ret < 0) {
568                 iscsit_tx_thread_wait_for_tcp(conn);
569                 return ret;
570         }
571
572         return 0;
573 }
574
575 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
576 static void iscsit_unmap_iovec(struct iscsi_cmd *);
577 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
578                                     u32, u32, u32, u8 *);
579 static int
580 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
581                        const struct iscsi_datain *datain)
582 {
583         struct kvec *iov;
584         u32 iov_count = 0, tx_size = 0;
585         int ret, iov_ret;
586
587         iov = &cmd->iov_data[0];
588         iov[iov_count].iov_base = cmd->pdu;
589         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
590         tx_size += ISCSI_HDR_LEN;
591
592         if (conn->conn_ops->HeaderDigest) {
593                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
594
595                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
596                                           ISCSI_HDR_LEN, 0, NULL,
597                                           header_digest);
598
599                 iov[0].iov_len += ISCSI_CRC_LEN;
600                 tx_size += ISCSI_CRC_LEN;
601
602                 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
603                          *header_digest);
604         }
605
606         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
607                                    datain->offset, datain->length);
608         if (iov_ret < 0)
609                 return -1;
610
611         iov_count += iov_ret;
612         tx_size += datain->length;
613
614         cmd->padding = ((-datain->length) & 3);
615         if (cmd->padding) {
616                 iov[iov_count].iov_base         = cmd->pad_bytes;
617                 iov[iov_count++].iov_len        = cmd->padding;
618                 tx_size += cmd->padding;
619
620                 pr_debug("Attaching %u padding bytes\n", cmd->padding);
621         }
622
623         if (conn->conn_ops->DataDigest) {
624                 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
625                                                          cmd, datain->offset,
626                                                          datain->length,
627                                                          cmd->padding,
628                                                          cmd->pad_bytes);
629
630                 iov[iov_count].iov_base = &cmd->data_crc;
631                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
632                 tx_size += ISCSI_CRC_LEN;
633
634                 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
635                          datain->length + cmd->padding, cmd->data_crc);
636         }
637
638         cmd->iov_data_count = iov_count;
639         cmd->tx_size = tx_size;
640
641         ret = iscsit_fe_sendpage_sg(cmd, conn);
642
643         iscsit_unmap_iovec(cmd);
644
645         if (ret < 0) {
646                 iscsit_tx_thread_wait_for_tcp(conn);
647                 return ret;
648         }
649
650         return 0;
651 }
652
653 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
654                            struct iscsi_datain_req *dr, const void *buf,
655                            u32 buf_len)
656 {
657         if (dr)
658                 return iscsit_xmit_datain_pdu(conn, cmd, buf);
659         else
660                 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
661 }
662
663 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
664 {
665         return TARGET_PROT_NORMAL;
666 }
667
668 static struct iscsit_transport iscsi_target_transport = {
669         .name                   = "iSCSI/TCP",
670         .transport_type         = ISCSI_TCP,
671         .rdma_shutdown          = false,
672         .owner                  = NULL,
673         .iscsit_setup_np        = iscsit_setup_np,
674         .iscsit_accept_np       = iscsit_accept_np,
675         .iscsit_free_np         = iscsit_free_np,
676         .iscsit_get_login_rx    = iscsit_get_login_rx,
677         .iscsit_put_login_tx    = iscsit_put_login_tx,
678         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
679         .iscsit_immediate_queue = iscsit_immediate_queue,
680         .iscsit_response_queue  = iscsit_response_queue,
681         .iscsit_queue_data_in   = iscsit_queue_rsp,
682         .iscsit_queue_status    = iscsit_queue_rsp,
683         .iscsit_aborted_task    = iscsit_aborted_task,
684         .iscsit_xmit_pdu        = iscsit_xmit_pdu,
685         .iscsit_get_rx_pdu      = iscsit_get_rx_pdu,
686         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
687 };
688
689 static int __init iscsi_target_init_module(void)
690 {
691         int ret = 0, size;
692
693         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
694         iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
695         if (!iscsit_global)
696                 return -1;
697
698         spin_lock_init(&iscsit_global->ts_bitmap_lock);
699         mutex_init(&auth_id_lock);
700         spin_lock_init(&sess_idr_lock);
701         idr_init(&tiqn_idr);
702         idr_init(&sess_idr);
703
704         ret = target_register_template(&iscsi_ops);
705         if (ret)
706                 goto out;
707
708         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
709         iscsit_global->ts_bitmap = vzalloc(size);
710         if (!iscsit_global->ts_bitmap)
711                 goto configfs_out;
712
713         lio_qr_cache = kmem_cache_create("lio_qr_cache",
714                         sizeof(struct iscsi_queue_req),
715                         __alignof__(struct iscsi_queue_req), 0, NULL);
716         if (!lio_qr_cache) {
717                 pr_err("nable to kmem_cache_create() for"
718                                 " lio_qr_cache\n");
719                 goto bitmap_out;
720         }
721
722         lio_dr_cache = kmem_cache_create("lio_dr_cache",
723                         sizeof(struct iscsi_datain_req),
724                         __alignof__(struct iscsi_datain_req), 0, NULL);
725         if (!lio_dr_cache) {
726                 pr_err("Unable to kmem_cache_create() for"
727                                 " lio_dr_cache\n");
728                 goto qr_out;
729         }
730
731         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
732                         sizeof(struct iscsi_ooo_cmdsn),
733                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
734         if (!lio_ooo_cache) {
735                 pr_err("Unable to kmem_cache_create() for"
736                                 " lio_ooo_cache\n");
737                 goto dr_out;
738         }
739
740         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
741                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
742                         0, NULL);
743         if (!lio_r2t_cache) {
744                 pr_err("Unable to kmem_cache_create() for"
745                                 " lio_r2t_cache\n");
746                 goto ooo_out;
747         }
748
749         iscsit_register_transport(&iscsi_target_transport);
750
751         if (iscsit_load_discovery_tpg() < 0)
752                 goto r2t_out;
753
754         return ret;
755 r2t_out:
756         iscsit_unregister_transport(&iscsi_target_transport);
757         kmem_cache_destroy(lio_r2t_cache);
758 ooo_out:
759         kmem_cache_destroy(lio_ooo_cache);
760 dr_out:
761         kmem_cache_destroy(lio_dr_cache);
762 qr_out:
763         kmem_cache_destroy(lio_qr_cache);
764 bitmap_out:
765         vfree(iscsit_global->ts_bitmap);
766 configfs_out:
767         /* XXX: this probably wants it to be it's own unwind step.. */
768         if (iscsit_global->discovery_tpg)
769                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
770         target_unregister_template(&iscsi_ops);
771 out:
772         kfree(iscsit_global);
773         return -ENOMEM;
774 }
775
776 static void __exit iscsi_target_cleanup_module(void)
777 {
778         iscsit_release_discovery_tpg();
779         iscsit_unregister_transport(&iscsi_target_transport);
780         kmem_cache_destroy(lio_qr_cache);
781         kmem_cache_destroy(lio_dr_cache);
782         kmem_cache_destroy(lio_ooo_cache);
783         kmem_cache_destroy(lio_r2t_cache);
784
785         /*
786          * Shutdown discovery sessions and disable discovery TPG
787          */
788         if (iscsit_global->discovery_tpg)
789                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
790
791         target_unregister_template(&iscsi_ops);
792
793         vfree(iscsit_global->ts_bitmap);
794         kfree(iscsit_global);
795 }
796
797 int iscsit_add_reject(
798         struct iscsi_conn *conn,
799         u8 reason,
800         unsigned char *buf)
801 {
802         struct iscsi_cmd *cmd;
803
804         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
805         if (!cmd)
806                 return -1;
807
808         cmd->iscsi_opcode = ISCSI_OP_REJECT;
809         cmd->reject_reason = reason;
810
811         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
812         if (!cmd->buf_ptr) {
813                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
814                 iscsit_free_cmd(cmd, false);
815                 return -1;
816         }
817
818         spin_lock_bh(&conn->cmd_lock);
819         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
820         spin_unlock_bh(&conn->cmd_lock);
821
822         cmd->i_state = ISTATE_SEND_REJECT;
823         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
824
825         return -1;
826 }
827 EXPORT_SYMBOL(iscsit_add_reject);
828
829 static int iscsit_add_reject_from_cmd(
830         struct iscsi_cmd *cmd,
831         u8 reason,
832         bool add_to_conn,
833         unsigned char *buf)
834 {
835         struct iscsi_conn *conn;
836         const bool do_put = cmd->se_cmd.se_tfo != NULL;
837
838         if (!cmd->conn) {
839                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
840                                 cmd->init_task_tag);
841                 return -1;
842         }
843         conn = cmd->conn;
844
845         cmd->iscsi_opcode = ISCSI_OP_REJECT;
846         cmd->reject_reason = reason;
847
848         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
849         if (!cmd->buf_ptr) {
850                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
851                 iscsit_free_cmd(cmd, false);
852                 return -1;
853         }
854
855         if (add_to_conn) {
856                 spin_lock_bh(&conn->cmd_lock);
857                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
858                 spin_unlock_bh(&conn->cmd_lock);
859         }
860
861         cmd->i_state = ISTATE_SEND_REJECT;
862         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
863         /*
864          * Perform the kref_put now if se_cmd has already been setup by
865          * scsit_setup_scsi_cmd()
866          */
867         if (do_put) {
868                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
869                 target_put_sess_cmd(&cmd->se_cmd);
870         }
871         return -1;
872 }
873
874 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
875                                  unsigned char *buf)
876 {
877         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
878 }
879
880 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
881 {
882         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
883 }
884 EXPORT_SYMBOL(iscsit_reject_cmd);
885
886 /*
887  * Map some portion of the allocated scatterlist to an iovec, suitable for
888  * kernel sockets to copy data in/out.
889  */
890 static int iscsit_map_iovec(
891         struct iscsi_cmd *cmd,
892         struct kvec *iov,
893         u32 data_offset,
894         u32 data_length)
895 {
896         u32 i = 0;
897         struct scatterlist *sg;
898         unsigned int page_off;
899
900         /*
901          * We know each entry in t_data_sg contains a page.
902          */
903         u32 ent = data_offset / PAGE_SIZE;
904
905         if (ent >= cmd->se_cmd.t_data_nents) {
906                 pr_err("Initial page entry out-of-bounds\n");
907                 return -1;
908         }
909
910         sg = &cmd->se_cmd.t_data_sg[ent];
911         page_off = (data_offset % PAGE_SIZE);
912
913         cmd->first_data_sg = sg;
914         cmd->first_data_sg_off = page_off;
915
916         while (data_length) {
917                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
918
919                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
920                 iov[i].iov_len = cur_len;
921
922                 data_length -= cur_len;
923                 page_off = 0;
924                 sg = sg_next(sg);
925                 i++;
926         }
927
928         cmd->kmapped_nents = i;
929
930         return i;
931 }
932
933 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
934 {
935         u32 i;
936         struct scatterlist *sg;
937
938         sg = cmd->first_data_sg;
939
940         for (i = 0; i < cmd->kmapped_nents; i++)
941                 kunmap(sg_page(&sg[i]));
942 }
943
944 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
945 {
946         LIST_HEAD(ack_list);
947         struct iscsi_cmd *cmd, *cmd_p;
948
949         conn->exp_statsn = exp_statsn;
950
951         if (conn->sess->sess_ops->RDMAExtensions)
952                 return;
953
954         spin_lock_bh(&conn->cmd_lock);
955         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
956                 spin_lock(&cmd->istate_lock);
957                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
958                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
959                         cmd->i_state = ISTATE_REMOVE;
960                         spin_unlock(&cmd->istate_lock);
961                         list_move_tail(&cmd->i_conn_node, &ack_list);
962                         continue;
963                 }
964                 spin_unlock(&cmd->istate_lock);
965         }
966         spin_unlock_bh(&conn->cmd_lock);
967
968         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
969                 list_del_init(&cmd->i_conn_node);
970                 iscsit_free_cmd(cmd, false);
971         }
972 }
973
974 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
975 {
976         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
977
978         iov_count += ISCSI_IOV_DATA_BUFFER;
979         cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
980         if (!cmd->iov_data)
981                 return -ENOMEM;
982
983         cmd->orig_iov_data_count = iov_count;
984         return 0;
985 }
986
987 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
988                           unsigned char *buf)
989 {
990         int data_direction, payload_length;
991         struct iscsi_scsi_req *hdr;
992         int iscsi_task_attr;
993         int sam_task_attr;
994
995         atomic_long_inc(&conn->sess->cmd_pdus);
996
997         hdr                     = (struct iscsi_scsi_req *) buf;
998         payload_length          = ntoh24(hdr->dlength);
999
1000         /* FIXME; Add checks for AdditionalHeaderSegment */
1001
1002         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1003             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1004                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1005                                 " not set. Bad iSCSI Initiator.\n");
1006                 return iscsit_add_reject_cmd(cmd,
1007                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1008         }
1009
1010         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1011              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1012                 /*
1013                  * From RFC-3720 Section 10.3.1:
1014                  *
1015                  * "Either or both of R and W MAY be 1 when either the
1016                  *  Expected Data Transfer Length and/or Bidirectional Read
1017                  *  Expected Data Transfer Length are 0"
1018                  *
1019                  * For this case, go ahead and clear the unnecssary bits
1020                  * to avoid any confusion with ->data_direction.
1021                  */
1022                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1023                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1024
1025                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1026                         " set when Expected Data Transfer Length is 0 for"
1027                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1028         }
1029
1030         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1031             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1032                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1033                         " MUST be set if Expected Data Transfer Length is not 0."
1034                         " Bad iSCSI Initiator\n");
1035                 return iscsit_add_reject_cmd(cmd,
1036                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1037         }
1038
1039         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1040             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1041                 pr_err("Bidirectional operations not supported!\n");
1042                 return iscsit_add_reject_cmd(cmd,
1043                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1044         }
1045
1046         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1047                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1048                                 " Scsi Command PDU.\n");
1049                 return iscsit_add_reject_cmd(cmd,
1050                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1051         }
1052
1053         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1054                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1055                         " protocol error.\n", payload_length);
1056                 return iscsit_add_reject_cmd(cmd,
1057                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1058         }
1059
1060         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1061             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1062                 pr_err("Expected Data Transfer Length and Length of"
1063                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1064                         " bit is not set protocol error\n");
1065                 return iscsit_add_reject_cmd(cmd,
1066                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1067         }
1068
1069         if (payload_length > be32_to_cpu(hdr->data_length)) {
1070                 pr_err("DataSegmentLength: %u is greater than"
1071                         " EDTL: %u, protocol error.\n", payload_length,
1072                                 hdr->data_length);
1073                 return iscsit_add_reject_cmd(cmd,
1074                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1075         }
1076
1077         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1078                 pr_err("DataSegmentLength: %u is greater than"
1079                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
1080                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1081                 return iscsit_add_reject_cmd(cmd,
1082                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1083         }
1084
1085         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1086                 pr_err("DataSegmentLength: %u is greater than"
1087                         " FirstBurstLength: %u, protocol error.\n",
1088                         payload_length, conn->sess->sess_ops->FirstBurstLength);
1089                 return iscsit_add_reject_cmd(cmd,
1090                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1091         }
1092
1093         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1094                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1095                           DMA_NONE;
1096
1097         cmd->data_direction = data_direction;
1098         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1099         /*
1100          * Figure out the SAM Task Attribute for the incoming SCSI CDB
1101          */
1102         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1103             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1104                 sam_task_attr = TCM_SIMPLE_TAG;
1105         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1106                 sam_task_attr = TCM_ORDERED_TAG;
1107         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1108                 sam_task_attr = TCM_HEAD_TAG;
1109         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1110                 sam_task_attr = TCM_ACA_TAG;
1111         else {
1112                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1113                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1114                 sam_task_attr = TCM_SIMPLE_TAG;
1115         }
1116
1117         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
1118         cmd->i_state            = ISTATE_NEW_CMD;
1119         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1120         cmd->immediate_data     = (payload_length) ? 1 : 0;
1121         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1122                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1123         if (cmd->unsolicited_data)
1124                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1125
1126         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1127         if (hdr->flags & ISCSI_FLAG_CMD_READ)
1128                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1129         else
1130                 cmd->targ_xfer_tag = 0xFFFFFFFF;
1131         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1132         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1133         cmd->first_burst_len    = payload_length;
1134
1135         if (!conn->sess->sess_ops->RDMAExtensions &&
1136              cmd->data_direction == DMA_FROM_DEVICE) {
1137                 struct iscsi_datain_req *dr;
1138
1139                 dr = iscsit_allocate_datain_req();
1140                 if (!dr)
1141                         return iscsit_add_reject_cmd(cmd,
1142                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1143
1144                 iscsit_attach_datain_req(cmd, dr);
1145         }
1146
1147         /*
1148          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1149          */
1150         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1151                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1152                         cmd->data_direction, sam_task_attr,
1153                         cmd->sense_buffer + 2);
1154
1155         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1156                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1157                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1158                 conn->cid);
1159
1160         target_get_sess_cmd(&cmd->se_cmd, true);
1161
1162         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1163                                                      scsilun_to_int(&hdr->lun));
1164         if (cmd->sense_reason)
1165                 goto attach_cmd;
1166
1167         /* only used for printks or comparing with ->ref_task_tag */
1168         cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1169         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1170         if (cmd->sense_reason) {
1171                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1172                         return iscsit_add_reject_cmd(cmd,
1173                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1174                 }
1175
1176                 goto attach_cmd;
1177         }
1178
1179         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1180                 return iscsit_add_reject_cmd(cmd,
1181                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1182         }
1183
1184 attach_cmd:
1185         spin_lock_bh(&conn->cmd_lock);
1186         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1187         spin_unlock_bh(&conn->cmd_lock);
1188         /*
1189          * Check if we need to delay processing because of ALUA
1190          * Active/NonOptimized primary access state..
1191          */
1192         core_alua_check_nonop_delay(&cmd->se_cmd);
1193
1194         return 0;
1195 }
1196 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1197
1198 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1199 {
1200         iscsit_set_dataout_sequence_values(cmd);
1201
1202         spin_lock_bh(&cmd->dataout_timeout_lock);
1203         iscsit_start_dataout_timer(cmd, cmd->conn);
1204         spin_unlock_bh(&cmd->dataout_timeout_lock);
1205 }
1206 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1207
1208 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1209                             struct iscsi_scsi_req *hdr)
1210 {
1211         int cmdsn_ret = 0;
1212         /*
1213          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1214          * the Immediate Bit is not set, and no Immediate
1215          * Data is attached.
1216          *
1217          * A PDU/CmdSN carrying Immediate Data can only
1218          * be processed after the DataCRC has passed.
1219          * If the DataCRC fails, the CmdSN MUST NOT
1220          * be acknowledged. (See below)
1221          */
1222         if (!cmd->immediate_data) {
1223                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1224                                         (unsigned char *)hdr, hdr->cmdsn);
1225                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1226                         return -1;
1227                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1228                         target_put_sess_cmd(&cmd->se_cmd);
1229                         return 0;
1230                 }
1231         }
1232
1233         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1234
1235         /*
1236          * If no Immediate Data is attached, it's OK to return now.
1237          */
1238         if (!cmd->immediate_data) {
1239                 if (!cmd->sense_reason && cmd->unsolicited_data)
1240                         iscsit_set_unsoliticed_dataout(cmd);
1241                 if (!cmd->sense_reason)
1242                         return 0;
1243
1244                 target_put_sess_cmd(&cmd->se_cmd);
1245                 return 0;
1246         }
1247
1248         /*
1249          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1250          * execution.  These exceptions are processed in CmdSN order using
1251          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1252          */
1253         if (cmd->sense_reason)
1254                 return 1;
1255         /*
1256          * Call directly into transport_generic_new_cmd() to perform
1257          * the backend memory allocation.
1258          */
1259         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1260         if (cmd->sense_reason)
1261                 return 1;
1262
1263         return 0;
1264 }
1265 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1266
1267 static int
1268 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1269                           bool dump_payload)
1270 {
1271         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1272         /*
1273          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1274          */
1275         if (dump_payload)
1276                 goto after_immediate_data;
1277         /*
1278          * Check for underflow case where both EDTL and immediate data payload
1279          * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1280          * already been set in target_cmd_size_check() as se_cmd->data_length.
1281          *
1282          * For this special case, fail the command and dump the immediate data
1283          * payload.
1284          */
1285         if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1286                 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1287                 goto after_immediate_data;
1288         }
1289
1290         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1291                                         cmd->first_burst_len);
1292 after_immediate_data:
1293         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1294                 /*
1295                  * A PDU/CmdSN carrying Immediate Data passed
1296                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1297                  * Immediate Bit is not set.
1298                  */
1299                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1300                                         (unsigned char *)hdr, hdr->cmdsn);
1301                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1302                         return -1;
1303
1304                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1305                         int rc;
1306
1307                         rc = iscsit_dump_data_payload(cmd->conn,
1308                                                       cmd->first_burst_len, 1);
1309                         target_put_sess_cmd(&cmd->se_cmd);
1310                         return rc;
1311                 } else if (cmd->unsolicited_data)
1312                         iscsit_set_unsoliticed_dataout(cmd);
1313
1314         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1315                 /*
1316                  * Immediate Data failed DataCRC and ERL>=1,
1317                  * silently drop this PDU and let the initiator
1318                  * plug the CmdSN gap.
1319                  *
1320                  * FIXME: Send Unsolicited NOPIN with reserved
1321                  * TTT here to help the initiator figure out
1322                  * the missing CmdSN, although they should be
1323                  * intelligent enough to determine the missing
1324                  * CmdSN and issue a retry to plug the sequence.
1325                  */
1326                 cmd->i_state = ISTATE_REMOVE;
1327                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1328         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1329                 return -1;
1330
1331         return 0;
1332 }
1333
1334 static int
1335 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1336                            unsigned char *buf)
1337 {
1338         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1339         int rc, immed_data;
1340         bool dump_payload = false;
1341
1342         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1343         if (rc < 0)
1344                 return 0;
1345         /*
1346          * Allocation iovecs needed for struct socket operations for
1347          * traditional iSCSI block I/O.
1348          */
1349         if (iscsit_allocate_iovecs(cmd) < 0) {
1350                 return iscsit_reject_cmd(cmd,
1351                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1352         }
1353         immed_data = cmd->immediate_data;
1354
1355         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1356         if (rc < 0)
1357                 return rc;
1358         else if (rc > 0)
1359                 dump_payload = true;
1360
1361         if (!immed_data)
1362                 return 0;
1363
1364         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1365 }
1366
1367 static u32 iscsit_do_crypto_hash_sg(
1368         struct ahash_request *hash,
1369         struct iscsi_cmd *cmd,
1370         u32 data_offset,
1371         u32 data_length,
1372         u32 padding,
1373         u8 *pad_bytes)
1374 {
1375         u32 data_crc;
1376         struct scatterlist *sg;
1377         unsigned int page_off;
1378
1379         crypto_ahash_init(hash);
1380
1381         sg = cmd->first_data_sg;
1382         page_off = cmd->first_data_sg_off;
1383
1384         while (data_length) {
1385                 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1386
1387                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1388                 crypto_ahash_update(hash);
1389
1390                 data_length -= cur_len;
1391                 page_off = 0;
1392                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1393                 sg = sg_next(sg);
1394         }
1395
1396         if (padding) {
1397                 struct scatterlist pad_sg;
1398
1399                 sg_init_one(&pad_sg, pad_bytes, padding);
1400                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1401                                         padding);
1402                 crypto_ahash_finup(hash);
1403         } else {
1404                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1405                 crypto_ahash_final(hash);
1406         }
1407
1408         return data_crc;
1409 }
1410
1411 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1412         const void *buf, u32 payload_length, u32 padding,
1413         const void *pad_bytes, void *data_crc)
1414 {
1415         struct scatterlist sg[2];
1416
1417         sg_init_table(sg, ARRAY_SIZE(sg));
1418         sg_set_buf(sg, buf, payload_length);
1419         sg_set_buf(sg + 1, pad_bytes, padding);
1420
1421         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1422
1423         crypto_ahash_digest(hash);
1424 }
1425
1426 int
1427 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1428                            struct iscsi_cmd *cmd, u32 payload_length,
1429                            bool *success)
1430 {
1431         struct iscsi_data *hdr = buf;
1432         struct se_cmd *se_cmd;
1433         int rc;
1434
1435         /* iSCSI write */
1436         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1437
1438         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1439                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1440                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1441                 payload_length, conn->cid);
1442
1443         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1444                 pr_err("Command ITT: 0x%08x received DataOUT after"
1445                         " last DataOUT received, dumping payload\n",
1446                         cmd->init_task_tag);
1447                 return iscsit_dump_data_payload(conn, payload_length, 1);
1448         }
1449
1450         if (cmd->data_direction != DMA_TO_DEVICE) {
1451                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1452                         " NON-WRITE command.\n", cmd->init_task_tag);
1453                 return iscsit_dump_data_payload(conn, payload_length, 1);
1454         }
1455         se_cmd = &cmd->se_cmd;
1456         iscsit_mod_dataout_timer(cmd);
1457
1458         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1459                 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1460                        be32_to_cpu(hdr->offset), payload_length,
1461                        cmd->se_cmd.data_length);
1462                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1463         }
1464
1465         if (cmd->unsolicited_data) {
1466                 int dump_unsolicited_data = 0;
1467
1468                 if (conn->sess->sess_ops->InitialR2T) {
1469                         pr_err("Received unexpected unsolicited data"
1470                                 " while InitialR2T=Yes, protocol error.\n");
1471                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1472                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1473                         return -1;
1474                 }
1475                 /*
1476                  * Special case for dealing with Unsolicited DataOUT
1477                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1478                  * failures;
1479                  */
1480
1481                 /* Something's amiss if we're not in WRITE_PENDING state... */
1482                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1483                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1484                         dump_unsolicited_data = 1;
1485
1486                 if (dump_unsolicited_data) {
1487                         /*
1488                          * Check if a delayed TASK_ABORTED status needs to
1489                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1490                          * received with the unsolicited data out.
1491                          */
1492                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1493                                 iscsit_stop_dataout_timer(cmd);
1494
1495                         transport_check_aborted_status(se_cmd,
1496                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1497                         return iscsit_dump_data_payload(conn, payload_length, 1);
1498                 }
1499         } else {
1500                 /*
1501                  * For the normal solicited data path:
1502                  *
1503                  * Check for a delayed TASK_ABORTED status and dump any
1504                  * incoming data out payload if one exists.  Also, when the
1505                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1506                  * data out sequence, we decrement outstanding_r2ts.  Once
1507                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1508                  * TASK_ABORTED status.
1509                  */
1510                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1511                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1512                                 if (--cmd->outstanding_r2ts < 1) {
1513                                         iscsit_stop_dataout_timer(cmd);
1514                                         transport_check_aborted_status(
1515                                                         se_cmd, 1);
1516                                 }
1517
1518                         return iscsit_dump_data_payload(conn, payload_length, 1);
1519                 }
1520         }
1521         /*
1522          * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1523          * within-command recovery checks before receiving the payload.
1524          */
1525         rc = iscsit_check_pre_dataout(cmd, buf);
1526         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1527                 return 0;
1528         else if (rc == DATAOUT_CANNOT_RECOVER)
1529                 return -1;
1530         *success = true;
1531         return 0;
1532 }
1533 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1534
1535 int
1536 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1537                          struct iscsi_cmd **out_cmd)
1538 {
1539         struct iscsi_data *hdr = buf;
1540         struct iscsi_cmd *cmd;
1541         u32 payload_length = ntoh24(hdr->dlength);
1542         int rc;
1543         bool success = false;
1544
1545         if (!payload_length) {
1546                 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1547                 return 0;
1548         }
1549
1550         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1551                 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1552                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1553                         conn->conn_ops->MaxXmitDataSegmentLength);
1554                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1555         }
1556
1557         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1558         if (!cmd)
1559                 return 0;
1560
1561         rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1562
1563         if (success)
1564                 *out_cmd = cmd;
1565
1566         return rc;
1567 }
1568 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1569
1570 static int
1571 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1572                    struct iscsi_data *hdr)
1573 {
1574         struct kvec *iov;
1575         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1576         u32 payload_length = ntoh24(hdr->dlength);
1577         int iov_ret, data_crc_failed = 0;
1578
1579         rx_size += payload_length;
1580         iov = &cmd->iov_data[0];
1581
1582         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1583                                    payload_length);
1584         if (iov_ret < 0)
1585                 return -1;
1586
1587         iov_count += iov_ret;
1588
1589         padding = ((-payload_length) & 3);
1590         if (padding != 0) {
1591                 iov[iov_count].iov_base = cmd->pad_bytes;
1592                 iov[iov_count++].iov_len = padding;
1593                 rx_size += padding;
1594                 pr_debug("Receiving %u padding bytes.\n", padding);
1595         }
1596
1597         if (conn->conn_ops->DataDigest) {
1598                 iov[iov_count].iov_base = &checksum;
1599                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1600                 rx_size += ISCSI_CRC_LEN;
1601         }
1602
1603         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1604
1605         iscsit_unmap_iovec(cmd);
1606
1607         if (rx_got != rx_size)
1608                 return -1;
1609
1610         if (conn->conn_ops->DataDigest) {
1611                 u32 data_crc;
1612
1613                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1614                                                     be32_to_cpu(hdr->offset),
1615                                                     payload_length, padding,
1616                                                     cmd->pad_bytes);
1617
1618                 if (checksum != data_crc) {
1619                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1620                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1621                                 " does not match computed 0x%08x\n",
1622                                 hdr->itt, hdr->offset, payload_length,
1623                                 hdr->datasn, checksum, data_crc);
1624                         data_crc_failed = 1;
1625                 } else {
1626                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1627                                 " %u bytes of Data Out\n", checksum,
1628                                 payload_length);
1629                 }
1630         }
1631
1632         return data_crc_failed;
1633 }
1634
1635 int
1636 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1637                              bool data_crc_failed)
1638 {
1639         struct iscsi_conn *conn = cmd->conn;
1640         int rc, ooo_cmdsn;
1641         /*
1642          * Increment post receive data and CRC values or perform
1643          * within-command recovery.
1644          */
1645         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1646         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1647                 return 0;
1648         else if (rc == DATAOUT_SEND_R2T) {
1649                 iscsit_set_dataout_sequence_values(cmd);
1650                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1651         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1652                 /*
1653                  * Handle extra special case for out of order
1654                  * Unsolicited Data Out.
1655                  */
1656                 spin_lock_bh(&cmd->istate_lock);
1657                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1658                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1659                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1660                 spin_unlock_bh(&cmd->istate_lock);
1661
1662                 iscsit_stop_dataout_timer(cmd);
1663                 if (ooo_cmdsn)
1664                         return 0;
1665                 target_execute_cmd(&cmd->se_cmd);
1666                 return 0;
1667         } else /* DATAOUT_CANNOT_RECOVER */
1668                 return -1;
1669
1670         return 0;
1671 }
1672 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1673
1674 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1675 {
1676         struct iscsi_cmd *cmd = NULL;
1677         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1678         int rc;
1679         bool data_crc_failed = false;
1680
1681         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1682         if (rc < 0)
1683                 return 0;
1684         else if (!cmd)
1685                 return 0;
1686
1687         rc = iscsit_get_dataout(conn, cmd, hdr);
1688         if (rc < 0)
1689                 return rc;
1690         else if (rc > 0)
1691                 data_crc_failed = true;
1692
1693         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1694 }
1695
1696 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1697                          struct iscsi_nopout *hdr)
1698 {
1699         u32 payload_length = ntoh24(hdr->dlength);
1700
1701         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1702                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1703                 if (!cmd)
1704                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1705                                                  (unsigned char *)hdr);
1706                 
1707                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1708                                          (unsigned char *)hdr);
1709         }
1710
1711         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1712                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1713                         " not set, protocol error.\n");
1714                 if (!cmd)
1715                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1716                                                  (unsigned char *)hdr);
1717
1718                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1719                                          (unsigned char *)hdr);
1720         }
1721
1722         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1723                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1724                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1725                         " error.\n", payload_length,
1726                         conn->conn_ops->MaxXmitDataSegmentLength);
1727                 if (!cmd)
1728                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1729                                                  (unsigned char *)hdr);
1730
1731                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1732                                          (unsigned char *)hdr);
1733         }
1734
1735         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1736                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1737                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1738                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1739                 payload_length);
1740         /*
1741          * This is not a response to a Unsolicited NopIN, which means
1742          * it can either be a NOPOUT ping request (with a valid ITT),
1743          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1744          * Either way, make sure we allocate an struct iscsi_cmd, as both
1745          * can contain ping data.
1746          */
1747         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1748                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1749                 cmd->i_state            = ISTATE_SEND_NOPIN;
1750                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1751                                                 1 : 0);
1752                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1753                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1754                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1755                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1756                 cmd->data_direction     = DMA_NONE;
1757         }
1758
1759         return 0;
1760 }
1761 EXPORT_SYMBOL(iscsit_setup_nop_out);
1762
1763 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1764                            struct iscsi_nopout *hdr)
1765 {
1766         struct iscsi_cmd *cmd_p = NULL;
1767         int cmdsn_ret = 0;
1768         /*
1769          * Initiator is expecting a NopIN ping reply..
1770          */
1771         if (hdr->itt != RESERVED_ITT) {
1772                 if (!cmd)
1773                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1774                                                 (unsigned char *)hdr);
1775
1776                 spin_lock_bh(&conn->cmd_lock);
1777                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1778                 spin_unlock_bh(&conn->cmd_lock);
1779
1780                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1781
1782                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1783                         iscsit_add_cmd_to_response_queue(cmd, conn,
1784                                                          cmd->i_state);
1785                         return 0;
1786                 }
1787
1788                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1789                                 (unsigned char *)hdr, hdr->cmdsn);
1790                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1791                         return 0;
1792                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1793                         return -1;
1794
1795                 return 0;
1796         }
1797         /*
1798          * This was a response to a unsolicited NOPIN ping.
1799          */
1800         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1801                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1802                 if (!cmd_p)
1803                         return -EINVAL;
1804
1805                 iscsit_stop_nopin_response_timer(conn);
1806
1807                 cmd_p->i_state = ISTATE_REMOVE;
1808                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1809
1810                 iscsit_start_nopin_timer(conn);
1811                 return 0;
1812         }
1813         /*
1814          * Otherwise, initiator is not expecting a NOPIN is response.
1815          * Just ignore for now.
1816          */
1817
1818         if (cmd)
1819                 iscsit_free_cmd(cmd, false);
1820
1821         return 0;
1822 }
1823 EXPORT_SYMBOL(iscsit_process_nop_out);
1824
1825 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1826                                  unsigned char *buf)
1827 {
1828         unsigned char *ping_data = NULL;
1829         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1830         struct kvec *iov = NULL;
1831         u32 payload_length = ntoh24(hdr->dlength);
1832         int ret;
1833
1834         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1835         if (ret < 0)
1836                 return 0;
1837         /*
1838          * Handle NOP-OUT payload for traditional iSCSI sockets
1839          */
1840         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1841                 u32 checksum, data_crc, padding = 0;
1842                 int niov = 0, rx_got, rx_size = payload_length;
1843
1844                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1845                 if (!ping_data) {
1846                         ret = -1;
1847                         goto out;
1848                 }
1849
1850                 iov = &cmd->iov_misc[0];
1851                 iov[niov].iov_base      = ping_data;
1852                 iov[niov++].iov_len     = payload_length;
1853
1854                 padding = ((-payload_length) & 3);
1855                 if (padding != 0) {
1856                         pr_debug("Receiving %u additional bytes"
1857                                 " for padding.\n", padding);
1858                         iov[niov].iov_base      = &cmd->pad_bytes;
1859                         iov[niov++].iov_len     = padding;
1860                         rx_size += padding;
1861                 }
1862                 if (conn->conn_ops->DataDigest) {
1863                         iov[niov].iov_base      = &checksum;
1864                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1865                         rx_size += ISCSI_CRC_LEN;
1866                 }
1867
1868                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1869                 if (rx_got != rx_size) {
1870                         ret = -1;
1871                         goto out;
1872                 }
1873
1874                 if (conn->conn_ops->DataDigest) {
1875                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1876                                                   payload_length, padding,
1877                                                   cmd->pad_bytes, &data_crc);
1878
1879                         if (checksum != data_crc) {
1880                                 pr_err("Ping data CRC32C DataDigest"
1881                                 " 0x%08x does not match computed 0x%08x\n",
1882                                         checksum, data_crc);
1883                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1884                                         pr_err("Unable to recover from"
1885                                         " NOPOUT Ping DataCRC failure while in"
1886                                                 " ERL=0.\n");
1887                                         ret = -1;
1888                                         goto out;
1889                                 } else {
1890                                         /*
1891                                          * Silently drop this PDU and let the
1892                                          * initiator plug the CmdSN gap.
1893                                          */
1894                                         pr_debug("Dropping NOPOUT"
1895                                         " Command CmdSN: 0x%08x due to"
1896                                         " DataCRC error.\n", hdr->cmdsn);
1897                                         ret = 0;
1898                                         goto out;
1899                                 }
1900                         } else {
1901                                 pr_debug("Got CRC32C DataDigest"
1902                                 " 0x%08x for %u bytes of ping data.\n",
1903                                         checksum, payload_length);
1904                         }
1905                 }
1906
1907                 ping_data[payload_length] = '\0';
1908                 /*
1909                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1910                  */
1911                 cmd->buf_ptr = ping_data;
1912                 cmd->buf_ptr_size = payload_length;
1913
1914                 pr_debug("Got %u bytes of NOPOUT ping"
1915                         " data.\n", payload_length);
1916                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1917         }
1918
1919         return iscsit_process_nop_out(conn, cmd, hdr);
1920 out:
1921         if (cmd)
1922                 iscsit_free_cmd(cmd, false);
1923
1924         kfree(ping_data);
1925         return ret;
1926 }
1927
1928 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1929 {
1930         switch (iscsi_tmf) {
1931         case ISCSI_TM_FUNC_ABORT_TASK:
1932                 return TMR_ABORT_TASK;
1933         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1934                 return TMR_ABORT_TASK_SET;
1935         case ISCSI_TM_FUNC_CLEAR_ACA:
1936                 return TMR_CLEAR_ACA;
1937         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1938                 return TMR_CLEAR_TASK_SET;
1939         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1940                 return TMR_LUN_RESET;
1941         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1942                 return TMR_TARGET_WARM_RESET;
1943         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1944                 return TMR_TARGET_COLD_RESET;
1945         default:
1946                 return TMR_UNKNOWN;
1947         }
1948 }
1949
1950 int
1951 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1952                            unsigned char *buf)
1953 {
1954         struct se_tmr_req *se_tmr;
1955         struct iscsi_tmr_req *tmr_req;
1956         struct iscsi_tm *hdr;
1957         int out_of_order_cmdsn = 0, ret;
1958         u8 function, tcm_function = TMR_UNKNOWN;
1959
1960         hdr                     = (struct iscsi_tm *) buf;
1961         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1962         function = hdr->flags;
1963
1964         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1965                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1966                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1967                 hdr->rtt, hdr->refcmdsn, conn->cid);
1968
1969         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1970             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1971              hdr->rtt != RESERVED_ITT)) {
1972                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1973                 hdr->rtt = RESERVED_ITT;
1974         }
1975
1976         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1977                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1978                 pr_err("Task Management Request TASK_REASSIGN not"
1979                         " issued as immediate command, bad iSCSI Initiator"
1980                                 "implementation\n");
1981                 return iscsit_add_reject_cmd(cmd,
1982                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1983         }
1984         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1985             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1986                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1987
1988         cmd->data_direction = DMA_NONE;
1989         cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1990         if (!cmd->tmr_req) {
1991                 return iscsit_add_reject_cmd(cmd,
1992                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1993                                              buf);
1994         }
1995
1996         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1997                               conn->sess->se_sess, 0, DMA_NONE,
1998                               TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1999
2000         target_get_sess_cmd(&cmd->se_cmd, true);
2001
2002         /*
2003          * TASK_REASSIGN for ERL=2 / connection stays inside of
2004          * LIO-Target $FABRIC_MOD
2005          */
2006         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2007                 tcm_function = iscsit_convert_tmf(function);
2008                 if (tcm_function == TMR_UNKNOWN) {
2009                         pr_err("Unknown iSCSI TMR Function:"
2010                                " 0x%02x\n", function);
2011                         return iscsit_add_reject_cmd(cmd,
2012                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2013                 }
2014         }
2015         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2016                                  GFP_KERNEL);
2017         if (ret < 0)
2018                 return iscsit_add_reject_cmd(cmd,
2019                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2020
2021         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2022
2023         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2024         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2025         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2026         cmd->init_task_tag      = hdr->itt;
2027         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2028         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2029         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2030         se_tmr                  = cmd->se_cmd.se_tmr_req;
2031         tmr_req                 = cmd->tmr_req;
2032         /*
2033          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2034          */
2035         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2036                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2037                                                scsilun_to_int(&hdr->lun));
2038                 if (ret < 0) {
2039                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2040                         goto attach;
2041                 }
2042         }
2043
2044         switch (function) {
2045         case ISCSI_TM_FUNC_ABORT_TASK:
2046                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2047                 if (se_tmr->response)
2048                         goto attach;
2049                 break;
2050         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2051         case ISCSI_TM_FUNC_CLEAR_ACA:
2052         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2053         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2054                 break;
2055         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2056                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2057                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2058                         goto attach;
2059                 }
2060                 break;
2061         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2062                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2063                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2064                         goto attach;
2065                 }
2066                 break;
2067         case ISCSI_TM_FUNC_TASK_REASSIGN:
2068                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2069                 /*
2070                  * Perform sanity checks on the ExpDataSN only if the
2071                  * TASK_REASSIGN was successful.
2072                  */
2073                 if (se_tmr->response)
2074                         break;
2075
2076                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2077                         return iscsit_add_reject_cmd(cmd,
2078                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2079                 break;
2080         default:
2081                 pr_err("Unknown TMR function: 0x%02x, protocol"
2082                         " error.\n", function);
2083                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2084                 goto attach;
2085         }
2086
2087         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2088             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2089                 se_tmr->call_transport = 1;
2090 attach:
2091         spin_lock_bh(&conn->cmd_lock);
2092         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2093         spin_unlock_bh(&conn->cmd_lock);
2094
2095         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2096                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2097                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2098                         out_of_order_cmdsn = 1;
2099                 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2100                         target_put_sess_cmd(&cmd->se_cmd);
2101                         return 0;
2102                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2103                         return -1;
2104                 }
2105         }
2106         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2107
2108         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2109                 return 0;
2110         /*
2111          * Found the referenced task, send to transport for processing.
2112          */
2113         if (se_tmr->call_transport)
2114                 return transport_generic_handle_tmr(&cmd->se_cmd);
2115
2116         /*
2117          * Could not find the referenced LUN, task, or Task Management
2118          * command not authorized or supported.  Change state and
2119          * let the tx_thread send the response.
2120          *
2121          * For connection recovery, this is also the default action for
2122          * TMR TASK_REASSIGN.
2123          */
2124         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2125         target_put_sess_cmd(&cmd->se_cmd);
2126         return 0;
2127 }
2128 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2129
2130 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2131 int
2132 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2133                       struct iscsi_text *hdr)
2134 {
2135         u32 payload_length = ntoh24(hdr->dlength);
2136
2137         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2138                 pr_err("Unable to accept text parameter length: %u"
2139                         "greater than MaxXmitDataSegmentLength %u.\n",
2140                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2141                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2142                                          (unsigned char *)hdr);
2143         }
2144
2145         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2146              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2147                 pr_err("Multi sequence text commands currently not supported\n");
2148                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2149                                         (unsigned char *)hdr);
2150         }
2151
2152         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2153                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2154                 hdr->exp_statsn, payload_length);
2155
2156         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2157         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2158         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2159         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2160         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2161         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2162         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2163         cmd->data_direction     = DMA_NONE;
2164         kfree(cmd->text_in_ptr);
2165         cmd->text_in_ptr        = NULL;
2166
2167         return 0;
2168 }
2169 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2170
2171 int
2172 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2173                         struct iscsi_text *hdr)
2174 {
2175         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2176         int cmdsn_ret;
2177
2178         if (!text_in) {
2179                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2180                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2181                         pr_err("Unable to locate text_in buffer for sendtargets"
2182                                " discovery\n");
2183                         goto reject;
2184                 }
2185                 goto empty_sendtargets;
2186         }
2187         if (strncmp("SendTargets", text_in, 11) != 0) {
2188                 pr_err("Received Text Data that is not"
2189                         " SendTargets, cannot continue.\n");
2190                 goto reject;
2191         }
2192         text_ptr = strchr(text_in, '=');
2193         if (!text_ptr) {
2194                 pr_err("No \"=\" separator found in Text Data,"
2195                         "  cannot continue.\n");
2196                 goto reject;
2197         }
2198         if (!strncmp("=All", text_ptr, 4)) {
2199                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2200         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2201                    !strncmp("=eui.", text_ptr, 5)) {
2202                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2203         } else {
2204                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2205                 goto reject;
2206         }
2207
2208         spin_lock_bh(&conn->cmd_lock);
2209         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2210         spin_unlock_bh(&conn->cmd_lock);
2211
2212 empty_sendtargets:
2213         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2214
2215         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2216                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2217                                 (unsigned char *)hdr, hdr->cmdsn);
2218                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2219                         return -1;
2220
2221                 return 0;
2222         }
2223
2224         return iscsit_execute_cmd(cmd, 0);
2225
2226 reject:
2227         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2228                                  (unsigned char *)hdr);
2229 }
2230 EXPORT_SYMBOL(iscsit_process_text_cmd);
2231
2232 static int
2233 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2234                        unsigned char *buf)
2235 {
2236         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2237         char *text_in = NULL;
2238         u32 payload_length = ntoh24(hdr->dlength);
2239         int rx_size, rc;
2240
2241         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2242         if (rc < 0)
2243                 return 0;
2244
2245         rx_size = payload_length;
2246         if (payload_length) {
2247                 u32 checksum = 0, data_crc = 0;
2248                 u32 padding = 0, pad_bytes = 0;
2249                 int niov = 0, rx_got;
2250                 struct kvec iov[3];
2251
2252                 text_in = kzalloc(payload_length, GFP_KERNEL);
2253                 if (!text_in)
2254                         goto reject;
2255
2256                 cmd->text_in_ptr = text_in;
2257
2258                 memset(iov, 0, 3 * sizeof(struct kvec));
2259                 iov[niov].iov_base      = text_in;
2260                 iov[niov++].iov_len     = payload_length;
2261
2262                 padding = ((-payload_length) & 3);
2263                 if (padding != 0) {
2264                         iov[niov].iov_base = &pad_bytes;
2265                         iov[niov++].iov_len  = padding;
2266                         rx_size += padding;
2267                         pr_debug("Receiving %u additional bytes"
2268                                         " for padding.\n", padding);
2269                 }
2270                 if (conn->conn_ops->DataDigest) {
2271                         iov[niov].iov_base      = &checksum;
2272                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2273                         rx_size += ISCSI_CRC_LEN;
2274                 }
2275
2276                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2277                 if (rx_got != rx_size)
2278                         goto reject;
2279
2280                 if (conn->conn_ops->DataDigest) {
2281                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, text_in,
2282                                                   payload_length, padding,
2283                                                   &pad_bytes, &data_crc);
2284
2285                         if (checksum != data_crc) {
2286                                 pr_err("Text data CRC32C DataDigest"
2287                                         " 0x%08x does not match computed"
2288                                         " 0x%08x\n", checksum, data_crc);
2289                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2290                                         pr_err("Unable to recover from"
2291                                         " Text Data digest failure while in"
2292                                                 " ERL=0.\n");
2293                                         goto reject;
2294                                 } else {
2295                                         /*
2296                                          * Silently drop this PDU and let the
2297                                          * initiator plug the CmdSN gap.
2298                                          */
2299                                         pr_debug("Dropping Text"
2300                                         " Command CmdSN: 0x%08x due to"
2301                                         " DataCRC error.\n", hdr->cmdsn);
2302                                         kfree(text_in);
2303                                         return 0;
2304                                 }
2305                         } else {
2306                                 pr_debug("Got CRC32C DataDigest"
2307                                         " 0x%08x for %u bytes of text data.\n",
2308                                                 checksum, payload_length);
2309                         }
2310                 }
2311                 text_in[payload_length - 1] = '\0';
2312                 pr_debug("Successfully read %d bytes of text"
2313                                 " data.\n", payload_length);
2314         }
2315
2316         return iscsit_process_text_cmd(conn, cmd, hdr);
2317
2318 reject:
2319         kfree(cmd->text_in_ptr);
2320         cmd->text_in_ptr = NULL;
2321         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2322 }
2323
2324 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2325 {
2326         struct iscsi_conn *conn_p;
2327         struct iscsi_session *sess = conn->sess;
2328
2329         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2330                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2331
2332         atomic_set(&sess->session_logout, 1);
2333         atomic_set(&conn->conn_logout_remove, 1);
2334         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2335
2336         iscsit_inc_conn_usage_count(conn);
2337         iscsit_inc_session_usage_count(sess);
2338
2339         spin_lock_bh(&sess->conn_lock);
2340         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2341                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2342                         continue;
2343
2344                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2345                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2346         }
2347         spin_unlock_bh(&sess->conn_lock);
2348
2349         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2350
2351         return 0;
2352 }
2353
2354 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2355 {
2356         struct iscsi_conn *l_conn;
2357         struct iscsi_session *sess = conn->sess;
2358
2359         pr_debug("Received logout request CLOSECONNECTION for CID:"
2360                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2361
2362         /*
2363          * A Logout Request with a CLOSECONNECTION reason code for a CID
2364          * can arrive on a connection with a differing CID.
2365          */
2366         if (conn->cid == cmd->logout_cid) {
2367                 spin_lock_bh(&conn->state_lock);
2368                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2369                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2370
2371                 atomic_set(&conn->conn_logout_remove, 1);
2372                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2373                 iscsit_inc_conn_usage_count(conn);
2374
2375                 spin_unlock_bh(&conn->state_lock);
2376         } else {
2377                 /*
2378                  * Handle all different cid CLOSECONNECTION requests in
2379                  * iscsit_logout_post_handler_diffcid() as to give enough
2380                  * time for any non immediate command's CmdSN to be
2381                  * acknowledged on the connection in question.
2382                  *
2383                  * Here we simply make sure the CID is still around.
2384                  */
2385                 l_conn = iscsit_get_conn_from_cid(sess,
2386                                 cmd->logout_cid);
2387                 if (!l_conn) {
2388                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2389                         iscsit_add_cmd_to_response_queue(cmd, conn,
2390                                         cmd->i_state);
2391                         return 0;
2392                 }
2393
2394                 iscsit_dec_conn_usage_count(l_conn);
2395         }
2396
2397         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2398
2399         return 0;
2400 }
2401
2402 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2403 {
2404         struct iscsi_session *sess = conn->sess;
2405
2406         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2407                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2408
2409         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2410                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2411                         " while ERL!=2.\n");
2412                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2413                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2414                 return 0;
2415         }
2416
2417         if (conn->cid == cmd->logout_cid) {
2418                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2419                         " with CID: %hu on CID: %hu, implementation error.\n",
2420                                 cmd->logout_cid, conn->cid);
2421                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2422                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2423                 return 0;
2424         }
2425
2426         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2427
2428         return 0;
2429 }
2430
2431 int
2432 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2433                         unsigned char *buf)
2434 {
2435         int cmdsn_ret, logout_remove = 0;
2436         u8 reason_code = 0;
2437         struct iscsi_logout *hdr;
2438         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2439
2440         hdr                     = (struct iscsi_logout *) buf;
2441         reason_code             = (hdr->flags & 0x7f);
2442
2443         if (tiqn) {
2444                 spin_lock(&tiqn->logout_stats.lock);
2445                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2446                         tiqn->logout_stats.normal_logouts++;
2447                 else
2448                         tiqn->logout_stats.abnormal_logouts++;
2449                 spin_unlock(&tiqn->logout_stats.lock);
2450         }
2451
2452         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2453                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2454                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2455                 hdr->cid, conn->cid);
2456
2457         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2458                 pr_err("Received logout request on connection that"
2459                         " is not in logged in state, ignoring request.\n");
2460                 iscsit_free_cmd(cmd, false);
2461                 return 0;
2462         }
2463
2464         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2465         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2466         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2467         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2468         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2469         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2470         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2471         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2472         cmd->logout_reason      = reason_code;
2473         cmd->data_direction     = DMA_NONE;
2474
2475         /*
2476          * We need to sleep in these cases (by returning 1) until the Logout
2477          * Response gets sent in the tx thread.
2478          */
2479         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2480            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2481             be16_to_cpu(hdr->cid) == conn->cid))
2482                 logout_remove = 1;
2483
2484         spin_lock_bh(&conn->cmd_lock);
2485         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2486         spin_unlock_bh(&conn->cmd_lock);
2487
2488         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2489                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2490
2491         /*
2492          * Immediate commands are executed, well, immediately.
2493          * Non-Immediate Logout Commands are executed in CmdSN order.
2494          */
2495         if (cmd->immediate_cmd) {
2496                 int ret = iscsit_execute_cmd(cmd, 0);
2497
2498                 if (ret < 0)
2499                         return ret;
2500         } else {
2501                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2502                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2503                         logout_remove = 0;
2504                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2505                         return -1;
2506         }
2507
2508         return logout_remove;
2509 }
2510 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2511
2512 int iscsit_handle_snack(
2513         struct iscsi_conn *conn,
2514         unsigned char *buf)
2515 {
2516         struct iscsi_snack *hdr;
2517
2518         hdr                     = (struct iscsi_snack *) buf;
2519         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2520
2521         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2522                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2523                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2524                         hdr->begrun, hdr->runlength, conn->cid);
2525
2526         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2527                 pr_err("Initiator sent SNACK request while in"
2528                         " ErrorRecoveryLevel=0.\n");
2529                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2530                                          buf);
2531         }
2532         /*
2533          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2534          * call from inside iscsi_send_recovery_datain_or_r2t().
2535          */
2536         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2537         case 0:
2538                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2539                         hdr->itt,
2540                         be32_to_cpu(hdr->ttt),
2541                         be32_to_cpu(hdr->begrun),
2542                         be32_to_cpu(hdr->runlength));
2543         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2544                 return iscsit_handle_status_snack(conn, hdr->itt,
2545                         be32_to_cpu(hdr->ttt),
2546                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2547         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2548                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2549                         be32_to_cpu(hdr->begrun),
2550                         be32_to_cpu(hdr->runlength));
2551         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2552                 /* FIXME: Support R-Data SNACK */
2553                 pr_err("R-Data SNACK Not Supported.\n");
2554                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2555                                          buf);
2556         default:
2557                 pr_err("Unknown SNACK type 0x%02x, protocol"
2558                         " error.\n", hdr->flags & 0x0f);
2559                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2560                                          buf);
2561         }
2562
2563         return 0;
2564 }
2565 EXPORT_SYMBOL(iscsit_handle_snack);
2566
2567 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2568 {
2569         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2570             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2571                 wait_for_completion_interruptible_timeout(
2572                                         &conn->rx_half_close_comp,
2573                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2574         }
2575 }
2576
2577 static int iscsit_handle_immediate_data(
2578         struct iscsi_cmd *cmd,
2579         struct iscsi_scsi_req *hdr,
2580         u32 length)
2581 {
2582         int iov_ret, rx_got = 0, rx_size = 0;
2583         u32 checksum, iov_count = 0, padding = 0;
2584         struct iscsi_conn *conn = cmd->conn;
2585         struct kvec *iov;
2586
2587         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2588         if (iov_ret < 0)
2589                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2590
2591         rx_size = length;
2592         iov_count = iov_ret;
2593         iov = &cmd->iov_data[0];
2594
2595         padding = ((-length) & 3);
2596         if (padding != 0) {
2597                 iov[iov_count].iov_base = cmd->pad_bytes;
2598                 iov[iov_count++].iov_len = padding;
2599                 rx_size += padding;
2600         }
2601
2602         if (conn->conn_ops->DataDigest) {
2603                 iov[iov_count].iov_base         = &checksum;
2604                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2605                 rx_size += ISCSI_CRC_LEN;
2606         }
2607
2608         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2609
2610         iscsit_unmap_iovec(cmd);
2611
2612         if (rx_got != rx_size) {
2613                 iscsit_rx_thread_wait_for_tcp(conn);
2614                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2615         }
2616
2617         if (conn->conn_ops->DataDigest) {
2618                 u32 data_crc;
2619
2620                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2621                                                     cmd->write_data_done, length, padding,
2622                                                     cmd->pad_bytes);
2623
2624                 if (checksum != data_crc) {
2625                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2626                                 " does not match computed 0x%08x\n", checksum,
2627                                 data_crc);
2628
2629                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2630                                 pr_err("Unable to recover from"
2631                                         " Immediate Data digest failure while"
2632                                         " in ERL=0.\n");
2633                                 iscsit_reject_cmd(cmd,
2634                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2635                                                 (unsigned char *)hdr);
2636                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2637                         } else {
2638                                 iscsit_reject_cmd(cmd,
2639                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2640                                                 (unsigned char *)hdr);
2641                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2642                         }
2643                 } else {
2644                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2645                                 " %u bytes of Immediate Data\n", checksum,
2646                                 length);
2647                 }
2648         }
2649
2650         cmd->write_data_done += length;
2651
2652         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2653                 spin_lock_bh(&cmd->istate_lock);
2654                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2655                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2656                 spin_unlock_bh(&cmd->istate_lock);
2657         }
2658
2659         return IMMEDIATE_DATA_NORMAL_OPERATION;
2660 }
2661
2662 /*
2663  *      Called with sess->conn_lock held.
2664  */
2665 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2666         with active network interface */
2667 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2668 {
2669         struct iscsi_cmd *cmd;
2670         struct iscsi_conn *conn_p;
2671         bool found = false;
2672
2673         /*
2674          * Only send a Asynchronous Message on connections whos network
2675          * interface is still functional.
2676          */
2677         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2678                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2679                         iscsit_inc_conn_usage_count(conn_p);
2680                         found = true;
2681                         break;
2682                 }
2683         }
2684
2685         if (!found)
2686                 return;
2687
2688         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2689         if (!cmd) {
2690                 iscsit_dec_conn_usage_count(conn_p);
2691                 return;
2692         }
2693
2694         cmd->logout_cid = conn->cid;
2695         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2696         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2697
2698         spin_lock_bh(&conn_p->cmd_lock);
2699         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2700         spin_unlock_bh(&conn_p->cmd_lock);
2701
2702         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2703         iscsit_dec_conn_usage_count(conn_p);
2704 }
2705
2706 static int iscsit_send_conn_drop_async_message(
2707         struct iscsi_cmd *cmd,
2708         struct iscsi_conn *conn)
2709 {
2710         struct iscsi_async *hdr;
2711
2712         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2713
2714         hdr                     = (struct iscsi_async *) cmd->pdu;
2715         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2716         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2717         cmd->init_task_tag      = RESERVED_ITT;
2718         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2719         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2720         cmd->stat_sn            = conn->stat_sn++;
2721         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2722         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2723         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2724         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2725         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2726         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2727         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2728
2729         pr_debug("Sending Connection Dropped Async Message StatSN:"
2730                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2731                         cmd->logout_cid, conn->cid);
2732
2733         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2734 }
2735
2736 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2737 {
2738         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2739             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2740                 wait_for_completion_interruptible_timeout(
2741                                         &conn->tx_half_close_comp,
2742                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2743         }
2744 }
2745
2746 void
2747 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2748                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2749                         bool set_statsn)
2750 {
2751         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2752         hdr->flags              = datain->flags;
2753         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2754                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2755                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2756                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2757                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2758                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2759                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2760                 }
2761         }
2762         hton24(hdr->dlength, datain->length);
2763         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2764                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2765                                 (struct scsi_lun *)&hdr->lun);
2766         else
2767                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2768
2769         hdr->itt                = cmd->init_task_tag;
2770
2771         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2772                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2773         else
2774                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2775         if (set_statsn)
2776                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2777         else
2778                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2779
2780         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2781         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2782         hdr->datasn             = cpu_to_be32(datain->data_sn);
2783         hdr->offset             = cpu_to_be32(datain->offset);
2784
2785         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2786                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2787                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2788                 ntohl(hdr->offset), datain->length, conn->cid);
2789 }
2790 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2791
2792 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2793 {
2794         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2795         struct iscsi_datain datain;
2796         struct iscsi_datain_req *dr;
2797         int eodr = 0, ret;
2798         bool set_statsn = false;
2799
2800         memset(&datain, 0, sizeof(struct iscsi_datain));
2801         dr = iscsit_get_datain_values(cmd, &datain);
2802         if (!dr) {
2803                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2804                                 cmd->init_task_tag);
2805                 return -1;
2806         }
2807         /*
2808          * Be paranoid and double check the logic for now.
2809          */
2810         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2811                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2812                         " datain.length: %u exceeds cmd->data_length: %u\n",
2813                         cmd->init_task_tag, datain.offset, datain.length,
2814                         cmd->se_cmd.data_length);
2815                 return -1;
2816         }
2817
2818         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2819         /*
2820          * Special case for successfully execution w/ both DATAIN
2821          * and Sense Data.
2822          */
2823         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2824             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2825                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2826         else {
2827                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2828                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2829                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2830                         cmd->stat_sn = conn->stat_sn++;
2831                         set_statsn = true;
2832                 } else if (dr->dr_complete ==
2833                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2834                         set_statsn = true;
2835         }
2836
2837         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2838
2839         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2840         if (ret < 0)
2841                 return ret;
2842
2843         if (dr->dr_complete) {
2844                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2845                                 2 : 1;
2846                 iscsit_free_datain_req(cmd, dr);
2847         }
2848
2849         return eodr;
2850 }
2851
2852 int
2853 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2854                         struct iscsi_logout_rsp *hdr)
2855 {
2856         struct iscsi_conn *logout_conn = NULL;
2857         struct iscsi_conn_recovery *cr = NULL;
2858         struct iscsi_session *sess = conn->sess;
2859         /*
2860          * The actual shutting down of Sessions and/or Connections
2861          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2862          * is done in scsi_logout_post_handler().
2863          */
2864         switch (cmd->logout_reason) {
2865         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2866                 pr_debug("iSCSI session logout successful, setting"
2867                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2868                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2869                 break;
2870         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2871                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2872                         break;
2873                 /*
2874                  * For CLOSECONNECTION logout requests carrying
2875                  * a matching logout CID -> local CID, the reference
2876                  * for the local CID will have been incremented in
2877                  * iscsi_logout_closeconnection().
2878                  *
2879                  * For CLOSECONNECTION logout requests carrying
2880                  * a different CID than the connection it arrived
2881                  * on, the connection responding to cmd->logout_cid
2882                  * is stopped in iscsit_logout_post_handler_diffcid().
2883                  */
2884
2885                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2886                         " successful.\n", cmd->logout_cid, conn->cid);
2887                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2888                 break;
2889         case ISCSI_LOGOUT_REASON_RECOVERY:
2890                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2891                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2892                         break;
2893                 /*
2894                  * If the connection is still active from our point of view
2895                  * force connection recovery to occur.
2896                  */
2897                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2898                                 cmd->logout_cid);
2899                 if (logout_conn) {
2900                         iscsit_connection_reinstatement_rcfr(logout_conn);
2901                         iscsit_dec_conn_usage_count(logout_conn);
2902                 }
2903
2904                 cr = iscsit_get_inactive_connection_recovery_entry(
2905                                 conn->sess, cmd->logout_cid);
2906                 if (!cr) {
2907                         pr_err("Unable to locate CID: %hu for"
2908                         " REMOVECONNFORRECOVERY Logout Request.\n",
2909                                 cmd->logout_cid);
2910                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2911                         break;
2912                 }
2913
2914                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2915
2916                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2917                         " for recovery for CID: %hu on CID: %hu successful.\n",
2918                                 cmd->logout_cid, conn->cid);
2919                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2920                 break;
2921         default:
2922                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2923                                 cmd->logout_reason);
2924                 return -1;
2925         }
2926
2927         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2928         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2929         hdr->response           = cmd->logout_response;
2930         hdr->itt                = cmd->init_task_tag;
2931         cmd->stat_sn            = conn->stat_sn++;
2932         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2933
2934         iscsit_increment_maxcmdsn(cmd, conn->sess);
2935         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2936         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2937
2938         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2939                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2940                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2941                 cmd->logout_cid, conn->cid);
2942
2943         return 0;
2944 }
2945 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2946
2947 static int
2948 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2949 {
2950         int rc;
2951
2952         rc = iscsit_build_logout_rsp(cmd, conn,
2953                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2954         if (rc < 0)
2955                 return rc;
2956
2957         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2958 }
2959
2960 void
2961 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2962                        struct iscsi_nopin *hdr, bool nopout_response)
2963 {
2964         hdr->opcode             = ISCSI_OP_NOOP_IN;
2965         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2966         hton24(hdr->dlength, cmd->buf_ptr_size);
2967         if (nopout_response)
2968                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2969         hdr->itt                = cmd->init_task_tag;
2970         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2971         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2972                                   conn->stat_sn;
2973         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2974
2975         if (nopout_response)
2976                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2977
2978         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2979         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2980
2981         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2982                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2983                 "Solicited" : "Unsolicited", cmd->init_task_tag,
2984                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2985 }
2986 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2987
2988 /*
2989  *      Unsolicited NOPIN, either requesting a response or not.
2990  */
2991 static int iscsit_send_unsolicited_nopin(
2992         struct iscsi_cmd *cmd,
2993         struct iscsi_conn *conn,
2994         int want_response)
2995 {
2996         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2997         int ret;
2998
2999         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3000
3001         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3002                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3003
3004         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3005         if (ret < 0)
3006                 return ret;
3007
3008         spin_lock_bh(&cmd->istate_lock);
3009         cmd->i_state = want_response ?
3010                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3011         spin_unlock_bh(&cmd->istate_lock);
3012
3013         return 0;
3014 }
3015
3016 static int
3017 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3018 {
3019         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3020
3021         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3022
3023         /*
3024          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3025          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3026          */
3027         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3028
3029         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3030                                                      cmd->buf_ptr,
3031                                                      cmd->buf_ptr_size);
3032 }
3033
3034 static int iscsit_send_r2t(
3035         struct iscsi_cmd *cmd,
3036         struct iscsi_conn *conn)
3037 {
3038         struct iscsi_r2t *r2t;
3039         struct iscsi_r2t_rsp *hdr;
3040         int ret;
3041
3042         r2t = iscsit_get_r2t_from_list(cmd);
3043         if (!r2t)
3044                 return -1;
3045
3046         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3047         memset(hdr, 0, ISCSI_HDR_LEN);
3048         hdr->opcode             = ISCSI_OP_R2T;
3049         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3050         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3051                         (struct scsi_lun *)&hdr->lun);
3052         hdr->itt                = cmd->init_task_tag;
3053         if (conn->conn_transport->iscsit_get_r2t_ttt)
3054                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3055         else
3056                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3057         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3058         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3059         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3060         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3061         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3062         hdr->data_offset        = cpu_to_be32(r2t->offset);
3063         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3064
3065         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3066                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3067                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3068                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3069                         r2t->offset, r2t->xfer_len, conn->cid);
3070
3071         spin_lock_bh(&cmd->r2t_lock);
3072         r2t->sent_r2t = 1;
3073         spin_unlock_bh(&cmd->r2t_lock);
3074
3075         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3076         if (ret < 0) {
3077                 return ret;
3078         }
3079
3080         spin_lock_bh(&cmd->dataout_timeout_lock);
3081         iscsit_start_dataout_timer(cmd, conn);
3082         spin_unlock_bh(&cmd->dataout_timeout_lock);
3083
3084         return 0;
3085 }
3086
3087 /*
3088  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3089  *              connection recovery.
3090  */
3091 int iscsit_build_r2ts_for_cmd(
3092         struct iscsi_conn *conn,
3093         struct iscsi_cmd *cmd,
3094         bool recovery)
3095 {
3096         int first_r2t = 1;
3097         u32 offset = 0, xfer_len = 0;
3098
3099         spin_lock_bh(&cmd->r2t_lock);
3100         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3101                 spin_unlock_bh(&cmd->r2t_lock);
3102                 return 0;
3103         }
3104
3105         if (conn->sess->sess_ops->DataSequenceInOrder &&
3106             !recovery)
3107                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3108
3109         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3110                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3111                         offset = cmd->r2t_offset;
3112
3113                         if (first_r2t && recovery) {
3114                                 int new_data_end = offset +
3115                                         conn->sess->sess_ops->MaxBurstLength -
3116                                         cmd->next_burst_len;
3117
3118                                 if (new_data_end > cmd->se_cmd.data_length)
3119                                         xfer_len = cmd->se_cmd.data_length - offset;
3120                                 else
3121                                         xfer_len =
3122                                                 conn->sess->sess_ops->MaxBurstLength -
3123                                                 cmd->next_burst_len;
3124                         } else {
3125                                 int new_data_end = offset +
3126                                         conn->sess->sess_ops->MaxBurstLength;
3127
3128                                 if (new_data_end > cmd->se_cmd.data_length)
3129                                         xfer_len = cmd->se_cmd.data_length - offset;
3130                                 else
3131                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3132                         }
3133                         cmd->r2t_offset += xfer_len;
3134
3135                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3136                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3137                 } else {
3138                         struct iscsi_seq *seq;
3139
3140                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3141                         if (!seq) {
3142                                 spin_unlock_bh(&cmd->r2t_lock);
3143                                 return -1;
3144                         }
3145
3146                         offset = seq->offset;
3147                         xfer_len = seq->xfer_len;
3148
3149                         if (cmd->seq_send_order == cmd->seq_count)
3150                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3151                 }