projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
sched/headers: Prepare for new header dependencies before moving code to <linux/sched...
[linux-2.6-block.git] / drivers / target / iscsi / iscsi_target_login.c
CommitLineData
e48354ce
NB		 1/*******************************************************************************
2 * This file contains the login functions used by the iSCSI Target driver.
3 *
4c76251e 4 * (c) Copyright 2007-2013 Datera, Inc.
e48354ce
NB		 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
69110e3c 19#include <crypto/hash.h>
da5df620 20#include <linux/module.h>
e48354ce
NB		 21#include <linux/string.h>
22#include <linux/kthread.h>
40401530 23#include <linux/idr.h>
8dcf07be
BVA		 24#include <linux/tcp.h> /* TCP_NODELAY */
25#include <net/ipv6.h> /* ipv6_addr_v4mapped() */
e48354ce
NB		 26#include <scsi/iscsi_proto.h>
27#include <target/target_core_base.h>
c4795fb2 28#include <target/target_core_fabric.h>
e48354ce 29
67f091f2
SG		 30#include <target/iscsi/iscsi_target_core.h>
31#include <target/iscsi/iscsi_target_stat.h>
e48354ce
NB		 32#include "iscsi_target_device.h"
33#include "iscsi_target_nego.h"
34#include "iscsi_target_erl0.h"
35#include "iscsi_target_erl2.h"
36#include "iscsi_target_login.h"
e48354ce
NB		 37#include "iscsi_target_tpg.h"
38#include "iscsi_target_util.h"
39#include "iscsi_target.h"
40#include "iscsi_target_parameters.h"
41
baa4d64b
NB		 42#include <target/iscsi/iscsi_transport.h>
43
44static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
e48354ce 45{
baa4d64b
NB		 46 struct iscsi_login *login;
47
48 login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
49 if (!login) {
50 pr_err("Unable to allocate memory for struct iscsi_login.\n");
51 return NULL;
52 }
a91eb7d9 53 conn->login = login;
baa4d64b
NB		 54 login->conn = conn;
55 login->first_request = 1;
56
57 login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
58 if (!login->req_buf) {
59 pr_err("Unable to allocate memory for response buffer.\n");
60 goto out_login;
61 }
62
63 login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
64 if (!login->rsp_buf) {
65 pr_err("Unable to allocate memory for request buffer.\n");
66 goto out_req_buf;
67 }
68
69 conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
70 if (!conn->conn_ops) {
71 pr_err("Unable to allocate memory for"
72 " struct iscsi_conn_ops.\n");
73 goto out_rsp_buf;
74 }
75
d5627acb 76 init_waitqueue_head(&conn->queues_wq);
e48354ce
NB		 77 INIT_LIST_HEAD(&conn->conn_list);
78 INIT_LIST_HEAD(&conn->conn_cmd_list);
79 INIT_LIST_HEAD(&conn->immed_queue_list);
80 INIT_LIST_HEAD(&conn->response_queue_list);
81 init_completion(&conn->conn_post_wait_comp);
82 init_completion(&conn->conn_wait_comp);
83 init_completion(&conn->conn_wait_rcfr_comp);
84 init_completion(&conn->conn_waiting_on_uc_comp);
85 init_completion(&conn->conn_logout_comp);
86 init_completion(&conn->rx_half_close_comp);
87 init_completion(&conn->tx_half_close_comp);
e5419865 88 init_completion(&conn->rx_login_comp);
e48354ce
NB		 89 spin_lock_init(&conn->cmd_lock);
90 spin_lock_init(&conn->conn_usage_lock);
91 spin_lock_init(&conn->immed_queue_lock);
92 spin_lock_init(&conn->nopin_timer_lock);
93 spin_lock_init(&conn->response_queue_lock);
94 spin_lock_init(&conn->state_lock);
95
96 if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
97 pr_err("Unable to allocate conn->conn_cpumask\n");
baa4d64b 98 goto out_conn_ops;
e48354ce 99 }
baa4d64b 100 conn->conn_login = login;
e48354ce 101
baa4d64b
NB		 102 return login;
103
104out_conn_ops:
105 kfree(conn->conn_ops);
106out_rsp_buf:
107 kfree(login->rsp_buf);
108out_req_buf:
109 kfree(login->req_buf);
110out_login:
111 kfree(login);
112 return NULL;
e48354ce
NB		 113}
114
115/*
116 * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
117 * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
118 */
119int iscsi_login_setup_crypto(struct iscsi_conn *conn)
120{
69110e3c
HX		 121 struct crypto_ahash *tfm;
122
e48354ce
NB		 123 /*
124 * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
125 * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
126 * to software 1x8 byte slicing from crc32c.ko
127 */
69110e3c
HX		 128 tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
129 if (IS_ERR(tfm)) {
130 pr_err("crypto_alloc_ahash() failed\n");
e48354ce
NB		 131 return -ENOMEM;
132 }
133
69110e3c
HX		 134 conn->conn_rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
135 if (!conn->conn_rx_hash) {
136 pr_err("ahash_request_alloc() failed for conn_rx_hash\n");
137 crypto_free_ahash(tfm);
138 return -ENOMEM;
139 }
140 ahash_request_set_callback(conn->conn_rx_hash, 0, NULL, NULL);
141
142 conn->conn_tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
143 if (!conn->conn_tx_hash) {
144 pr_err("ahash_request_alloc() failed for conn_tx_hash\n");
145 ahash_request_free(conn->conn_rx_hash);
146 conn->conn_rx_hash = NULL;
147 crypto_free_ahash(tfm);
e48354ce
NB		 148 return -ENOMEM;
149 }
69110e3c 150 ahash_request_set_callback(conn->conn_tx_hash, 0, NULL, NULL);
e48354ce
NB		 151
152 return 0;
153}
154
155static int iscsi_login_check_initiator_version(
156 struct iscsi_conn *conn,
157 u8 version_max,
158 u8 version_min)
159{
160 if ((version_max != 0x00) || (version_min != 0x00)) {
161 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
162 " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
163 version_min, version_max);
164 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
165 ISCSI_LOGIN_STATUS_NO_VERSION);
166 return -1;
167 }
168
169 return 0;
170}
171
172int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
173{
174 int sessiontype;
175 struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
176 struct iscsi_portal_group *tpg = conn->tpg;
177 struct iscsi_session *sess = NULL, *sess_p = NULL;
178 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
179 struct se_session *se_sess, *se_sess_tmp;
180
181 initiatorname_param = iscsi_find_param_from_key(
182 INITIATORNAME, conn->param_list);
e48354ce
NB		 183 sessiontype_param = iscsi_find_param_from_key(
184 SESSIONTYPE, conn->param_list);
1c5c12c6
RD		 185 if (!initiatorname_param || !sessiontype_param) {
186 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
187 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
e48354ce 188 return -1;
1c5c12c6 189 }
e48354ce
NB		 190
191 sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
192
193 spin_lock_bh(&se_tpg->session_lock);
194 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
195 sess_list) {
196
8359cf43 197 sess_p = se_sess->fabric_sess_ptr;
e48354ce
NB		 198 spin_lock(&sess_p->conn_lock);
199 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
200 atomic_read(&sess_p->session_logout) ||
201 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
202 spin_unlock(&sess_p->conn_lock);
203 continue;
204 }
8359cf43
JE		 205 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
206 (!strcmp(sess_p->sess_ops->InitiatorName,
207 initiatorname_param->value) &&
e48354ce
NB		 208 (sess_p->sess_ops->SessionType == sessiontype))) {
209 atomic_set(&sess_p->session_reinstatement, 1);
210 spin_unlock(&sess_p->conn_lock);
211 iscsit_inc_session_usage_count(sess_p);
212 iscsit_stop_time2retain_timer(sess_p);
213 sess = sess_p;
214 break;
215 }
216 spin_unlock(&sess_p->conn_lock);
217 }
218 spin_unlock_bh(&se_tpg->session_lock);
219 /*
220 * If the Time2Retain handler has expired, the session is already gone.
221 */
222 if (!sess)
223 return 0;
224
225 pr_debug("%s iSCSI Session SID %u is still active for %s,"
226 " preforming session reinstatement.\n", (sessiontype) ?
227 "Discovery" : "Normal", sess->sid,
228 sess->sess_ops->InitiatorName);
229
230 spin_lock_bh(&sess->conn_lock);
231 if (sess->session_state == TARG_SESS_STATE_FAILED) {
232 spin_unlock_bh(&sess->conn_lock);
233 iscsit_dec_session_usage_count(sess);
44f33d0f 234 iscsit_close_session(sess);
99367f01 235 return 0;
e48354ce
NB		 236 }
237 spin_unlock_bh(&sess->conn_lock);
238
239 iscsit_stop_session(sess, 1, 1);
240 iscsit_dec_session_usage_count(sess);
241
44f33d0f 242 iscsit_close_session(sess);
99367f01 243 return 0;
e48354ce
NB		 244}
245
246static void iscsi_login_set_conn_values(
247 struct iscsi_session *sess,
248 struct iscsi_conn *conn,
50e5c87d 249 __be16 cid)
e48354ce
NB		 250{
251 conn->sess = sess;
50e5c87d 252 conn->cid = be16_to_cpu(cid);
e48354ce
NB		 253 /*
254 * Generate a random Status sequence number (statsn) for the new
255 * iSCSI connection.
256 */
257 get_random_bytes(&conn->stat_sn, sizeof(u32));
258
259 mutex_lock(&auth_id_lock);
260 conn->auth_id = iscsit_global->auth_id++;
261 mutex_unlock(&auth_id_lock);
262}
263
d2faaefb 264__printf(2, 3) int iscsi_change_param_sprintf(
79d59d08
RD		 265 struct iscsi_conn *conn,
266 const char *fmt, ...)
267{
268 va_list args;
269 unsigned char buf[64];
270
271 memset(buf, 0, sizeof buf);
272
273 va_start(args, fmt);
274 vsnprintf(buf, sizeof buf, fmt, args);
275 va_end(args);
276
277 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
278 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
279 ISCSI_LOGIN_STATUS_NO_RESOURCES);
280 return -1;
281 }
282
283 return 0;
284}
d2faaefb 285EXPORT_SYMBOL(iscsi_change_param_sprintf);
79d59d08 286
e48354ce
NB		 287/*
288 * This is the leading connection of a new session,
289 * or session reinstatement.
290 */
291static int iscsi_login_zero_tsih_s1(
292 struct iscsi_conn *conn,
293 unsigned char *buf)
294{
295 struct iscsi_session *sess = NULL;
296 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
13b5533a 297 int ret;
e48354ce
NB		 298
299 sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
300 if (!sess) {
301 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
302 ISCSI_LOGIN_STATUS_NO_RESOURCES);
303 pr_err("Could not allocate memory for session\n");
0957627a 304 return -ENOMEM;
e48354ce
NB		 305 }
306
307 iscsi_login_set_conn_values(sess, conn, pdu->cid);
308 sess->init_task_tag = pdu->itt;
8359cf43 309 memcpy(&sess->isid, pdu->isid, 6);
50e5c87d 310 sess->exp_cmd_sn = be32_to_cpu(pdu->cmdsn);
e48354ce
NB		 311 INIT_LIST_HEAD(&sess->sess_conn_list);
312 INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
313 INIT_LIST_HEAD(&sess->cr_active_list);
314 INIT_LIST_HEAD(&sess->cr_inactive_list);
315 init_completion(&sess->async_msg_comp);
316 init_completion(&sess->reinstatement_comp);
317 init_completion(&sess->session_wait_comp);
318 init_completion(&sess->session_waiting_on_uc_comp);
319 mutex_init(&sess->cmdsn_mutex);
320 spin_lock_init(&sess->conn_lock);
321 spin_lock_init(&sess->cr_a_lock);
322 spin_lock_init(&sess->cr_i_lock);
323 spin_lock_init(&sess->session_usage_lock);
324 spin_lock_init(&sess->ttt_lock);
325
c9365bd0 326 idr_preload(GFP_KERNEL);
998866b0 327 spin_lock_bh(&sess_idr_lock);
c9365bd0
TH		 328 ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
329 if (ret >= 0)
330 sess->session_index = ret;
998866b0 331 spin_unlock_bh(&sess_idr_lock);
c9365bd0 332 idr_preload_end();
e48354ce 333
13b5533a 334 if (ret < 0) {
c9365bd0 335 pr_err("idr_alloc() for sess_idr failed\n");
13b5533a
BW		 336 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
337 ISCSI_LOGIN_STATUS_NO_RESOURCES);
338 kfree(sess);
339 return -ENOMEM;
340 }
341
e48354ce 342 sess->creation_time = get_jiffies_64();
e48354ce
NB		 343 /*
344 * The FFP CmdSN window values will be allocated from the TPG's
345 * Initiator Node's ACL once the login has been successfully completed.
346 */
109e2381 347 atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn));
e48354ce
NB		 348
349 sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
350 if (!sess->sess_ops) {
351 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
352 ISCSI_LOGIN_STATUS_NO_RESOURCES);
353 pr_err("Unable to allocate memory for"
354 " struct iscsi_sess_ops.\n");
0957627a
NB		 355 kfree(sess);
356 return -ENOMEM;
e48354ce
NB		 357 }
358
23a548ee 359 sess->se_sess = transport_init_session(TARGET_PROT_NORMAL);
0957627a 360 if (IS_ERR(sess->se_sess)) {
e48354ce
NB		 361 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
362 ISCSI_LOGIN_STATUS_NO_RESOURCES);
a928d28d 363 kfree(sess->sess_ops);
0957627a
NB		 364 kfree(sess);
365 return -ENOMEM;
e48354ce
NB		 366 }
367
368 return 0;
369}
370
371static int iscsi_login_zero_tsih_s2(
372 struct iscsi_conn *conn)
373{
374 struct iscsi_node_attrib *na;
375 struct iscsi_session *sess = conn->sess;
03aa2070 376 bool iser = false;
e48354ce
NB		 377
378 sess->tpg = conn->tpg;
379
380 /*
381 * Assign a new TPG Session Handle. Note this is protected with
382 * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
383 */
60bfcf8e 384 sess->tsih = ++sess->tpg->ntsih;
e48354ce 385 if (!sess->tsih)
60bfcf8e 386 sess->tsih = ++sess->tpg->ntsih;
e48354ce
NB		 387
388 /*
389 * Create the default params from user defined values..
390 */
391 if (iscsi_copy_param_list(&conn->param_list,
60bfcf8e 392 conn->tpg->param_list, 1) < 0) {
e48354ce
NB		 393 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
394 ISCSI_LOGIN_STATUS_NO_RESOURCES);
395 return -1;
396 }
397
03aa2070
NB		 398 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
399 iser = true;
400
401 iscsi_set_keys_to_negotiate(conn->param_list, iser);
e48354ce
NB		 402
403 if (sess->sess_ops->SessionType)
404 return iscsi_set_keys_irrelevant_for_discovery(
405 conn->param_list);
406
407 na = iscsit_tpg_get_node_attrib(sess);
408
409 /*
410 * Need to send TargetPortalGroupTag back in first login response
411 * on any iSCSI connection where the Initiator provides TargetName.
412 * See 5.3.1. Login Phase Start
413 *
414 * In our case, we have already located the struct iscsi_tiqn at this point.
415 */
79d59d08 416 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
e48354ce 417 return -1;
e48354ce
NB		 418
419 /*
420 * Workaround for Initiators that have broken connection recovery logic.
421 *
422 * "We would really like to get rid of this." Linux-iSCSI.org team
423 */
79d59d08 424 if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
e48354ce 425 return -1;
e48354ce 426
03aa2070
NB		 427 /*
428 * Set RDMAExtensions=Yes by default for iSER enabled network portals
429 */
430 if (iser) {
431 struct iscsi_param *param;
432 unsigned long mrdsl, off;
433 int rc;
434
79d59d08 435 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
03aa2070 436 return -1;
79d59d08 437
03aa2070
NB		 438 /*
439 * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
3fc6a642 440 * Immediate Data + Unsolicited Data-OUT if necessary..
03aa2070
NB		 441 */
442 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
443 conn->param_list);
444 if (!param) {
445 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
446 ISCSI_LOGIN_STATUS_NO_RESOURCES);
447 return -1;
448 }
57103d7f 449 rc = kstrtoul(param->value, 0, &mrdsl);
03aa2070
NB		 450 if (rc < 0) {
451 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
452 ISCSI_LOGIN_STATUS_NO_RESOURCES);
453 return -1;
454 }
455 off = mrdsl % PAGE_SIZE;
456 if (!off)
52d0aa79 457 goto check_prot;
03aa2070
NB		 458
459 if (mrdsl < PAGE_SIZE)
460 mrdsl = PAGE_SIZE;
461 else
462 mrdsl -= off;
463
464 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
465 " to PAGE_SIZE\n", mrdsl);
466
79d59d08 467 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
03aa2070 468 return -1;
52d0aa79
NB		 469 /*
470 * ISER currently requires that ImmediateData + Unsolicited
471 * Data be disabled when protection / signature MRs are enabled.
472 */
473check_prot:
474 if (sess->se_sess->sup_prot_ops &
475 (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
476 TARGET_PROT_DOUT_INSERT)) {
477
79d59d08 478 if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
52d0aa79 479 return -1;
52d0aa79 480
79d59d08 481 if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
52d0aa79 482 return -1;
79d59d08 483
52d0aa79
NB		 484 pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
485 " T10-PI enabled ISER session\n");
486 }
03aa2070 487 }
e48354ce
NB		 488
489 return 0;
490}
491
e48354ce
NB		 492static int iscsi_login_non_zero_tsih_s1(
493 struct iscsi_conn *conn,
494 unsigned char *buf)
495{
496 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
497
498 iscsi_login_set_conn_values(NULL, conn, pdu->cid);
499 return 0;
500}
501
502/*
503 * Add a new connection to an existing session.
504 */
505static int iscsi_login_non_zero_tsih_s2(
506 struct iscsi_conn *conn,
507 unsigned char *buf)
508{
509 struct iscsi_portal_group *tpg = conn->tpg;
510 struct iscsi_session *sess = NULL, *sess_p = NULL;
511 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
512 struct se_session *se_sess, *se_sess_tmp;
513 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
03aa2070 514 bool iser = false;
e48354ce
NB		 515
516 spin_lock_bh(&se_tpg->session_lock);
517 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
518 sess_list) {
519
520 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
521 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
522 atomic_read(&sess_p->session_logout) ||
523 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
524 continue;
8359cf43 525 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
50e5c87d 526 (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
e48354ce
NB		 527 iscsit_inc_session_usage_count(sess_p);
528 iscsit_stop_time2retain_timer(sess_p);
529 sess = sess_p;
530 break;
531 }
532 }
533 spin_unlock_bh(&se_tpg->session_lock);
534
535 /*
536 * If the Time2Retain handler has expired, the session is already gone.
537 */
538 if (!sess) {
539 pr_err("Initiator attempting to add a connection to"
540 " a non-existent session, rejecting iSCSI Login.\n");
541 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
542 ISCSI_LOGIN_STATUS_NO_SESSION);
543 return -1;
544 }
545
546 /*
547 * Stop the Time2Retain timer if this is a failed session, we restart
548 * the timer if the login is not successful.
549 */
550 spin_lock_bh(&sess->conn_lock);
551 if (sess->session_state == TARG_SESS_STATE_FAILED)
552 atomic_set(&sess->session_continuation, 1);
553 spin_unlock_bh(&sess->conn_lock);
554
555 iscsi_login_set_conn_values(sess, conn, pdu->cid);
556
557 if (iscsi_copy_param_list(&conn->param_list,
60bfcf8e 558 conn->tpg->param_list, 0) < 0) {
e48354ce
NB		 559 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
560 ISCSI_LOGIN_STATUS_NO_RESOURCES);
561 return -1;
562 }
563
03aa2070
NB		 564 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
565 iser = true;
566
567 iscsi_set_keys_to_negotiate(conn->param_list, iser);
e48354ce
NB		 568 /*
569 * Need to send TargetPortalGroupTag back in first login response
570 * on any iSCSI connection where the Initiator provides TargetName.
571 * See 5.3.1. Login Phase Start
572 *
573 * In our case, we have already located the struct iscsi_tiqn at this point.
574 */
79d59d08 575 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
e48354ce 576 return -1;
e48354ce 577
c04a6091 578 return 0;
e48354ce
NB		 579}
580
581int iscsi_login_post_auth_non_zero_tsih(
582 struct iscsi_conn *conn,
583 u16 cid,
584 u32 exp_statsn)
585{
586 struct iscsi_conn *conn_ptr = NULL;
587 struct iscsi_conn_recovery *cr = NULL;
588 struct iscsi_session *sess = conn->sess;
589
590 /*
591 * By following item 5 in the login table, if we have found
592 * an existing ISID and a valid/existing TSIH and an existing
593 * CID we do connection reinstatement. Currently we dont not
594 * support it so we send back an non-zero status class to the
595 * initiator and release the new connection.
596 */
597 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
ee1b1b9c 598 if (conn_ptr) {
e48354ce
NB		 599 pr_err("Connection exists with CID %hu for %s,"
600 " performing connection reinstatement.\n",
601 conn_ptr->cid, sess->sess_ops->InitiatorName);
602
603 iscsit_connection_reinstatement_rcfr(conn_ptr);
604 iscsit_dec_conn_usage_count(conn_ptr);
605 }
606
607 /*
608 * Check for any connection recovery entires containing CID.
609 * We use the original ExpStatSN sent in the first login request
610 * to acknowledge commands for the failed connection.
611 *
612 * Also note that an explict logout may have already been sent,
613 * but the response may not be sent due to additional connection
614 * loss.
615 */
616 if (sess->sess_ops->ErrorRecoveryLevel == 2) {
617 cr = iscsit_get_inactive_connection_recovery_entry(
618 sess, cid);
ee1b1b9c 619 if (cr) {
e48354ce
NB		 620 pr_debug("Performing implicit logout"
621 " for connection recovery on CID: %hu\n",
622 conn->cid);
623 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
624 }
625 }
626
627 /*
628 * Else we follow item 4 from the login table in that we have
629 * found an existing ISID and a valid/existing TSIH and a new
630 * CID we go ahead and continue to add a new connection to the
631 * session.
632 */
633 pr_debug("Adding CID %hu to existing session for %s.\n",
634 cid, sess->sess_ops->InitiatorName);
635
636 if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
637 pr_err("Adding additional connection to this session"
638 " would exceed MaxConnections %d, login failed.\n",
639 sess->sess_ops->MaxConnections);
640 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
641 ISCSI_LOGIN_STATUS_ISID_ERROR);
642 return -1;
643 }
644
645 return 0;
646}
647
648static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
649{
650 struct iscsi_session *sess = conn->sess;
03aa2070 651 /*
3fc6a642 652 * FIXME: Unsolicited NopIN support for ISER
03aa2070
NB		 653 */
654 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
655 return;
e48354ce
NB		 656
657 if (!sess->sess_ops->SessionType)
658 iscsit_start_nopin_timer(conn);
659}
660
e5419865 661int iscsit_start_kthreads(struct iscsi_conn *conn)
88dcd2da
NB		 662{
663 int ret = 0;
664
665 spin_lock(&iscsit_global->ts_bitmap_lock);
666 conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
667 ISCSIT_BITMAP_BITS, get_order(1));
668 spin_unlock(&iscsit_global->ts_bitmap_lock);
669
670 if (conn->bitmap_id < 0) {
671 pr_err("bitmap_find_free_region() failed for"
672 " iscsit_start_kthreads()\n");
673 return -ENOMEM;
674 }
675
676 conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
677 "%s", ISCSI_TX_THREAD_NAME);
678 if (IS_ERR(conn->tx_thread)) {
679 pr_err("Unable to start iscsi_target_tx_thread\n");
680 ret = PTR_ERR(conn->tx_thread);
681 goto out_bitmap;
682 }
683 conn->tx_thread_active = true;
684
685 conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
686 "%s", ISCSI_RX_THREAD_NAME);
687 if (IS_ERR(conn->rx_thread)) {
688 pr_err("Unable to start iscsi_target_rx_thread\n");
689 ret = PTR_ERR(conn->rx_thread);
690 goto out_tx;
691 }
692 conn->rx_thread_active = true;
693
694 return 0;
695out_tx:
e5419865 696 send_sig(SIGINT, conn->tx_thread, 1);
88dcd2da
NB		 697 kthread_stop(conn->tx_thread);
698 conn->tx_thread_active = false;
699out_bitmap:
700 spin_lock(&iscsit_global->ts_bitmap_lock);
701 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
702 get_order(1));
703 spin_unlock(&iscsit_global->ts_bitmap_lock);
704 return ret;
705}
706
e5419865 707void iscsi_post_login_handler(
e48354ce
NB		 708 struct iscsi_np *np,
709 struct iscsi_conn *conn,
710 u8 zero_tsih)
711{
712 int stop_timer = 0;
713 struct iscsi_session *sess = conn->sess;
714 struct se_session *se_sess = sess->se_sess;
60bfcf8e 715 struct iscsi_portal_group *tpg = sess->tpg;
e48354ce 716 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
e48354ce
NB		 717
718 iscsit_inc_conn_usage_count(conn);
719
720 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
721 ISCSI_LOGIN_STATUS_ACCEPT);
722
723 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
724 conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
725
726 iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
e48354ce
NB		 727 /*
728 * SCSI Initiator -> SCSI Target Port Mapping
729 */
e48354ce
NB		 730 if (!zero_tsih) {
731 iscsi_set_session_parameters(sess->sess_ops,
732 conn->param_list, 0);
733 iscsi_release_param_list(conn->param_list);
734 conn->param_list = NULL;
735
736 spin_lock_bh(&sess->conn_lock);
737 atomic_set(&sess->session_continuation, 0);
738 if (sess->session_state == TARG_SESS_STATE_FAILED) {
739 pr_debug("Moving to"
740 " TARG_SESS_STATE_LOGGED_IN.\n");
741 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
742 stop_timer = 1;
743 }
744
dc58f760
AG		 745 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"
746 " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
69d75574 747 &conn->local_sockaddr, tpg->tpgt);
e48354ce
NB		 748
749 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
750 atomic_inc(&sess->nconn);
751 pr_debug("Incremented iSCSI Connection count to %hu"
752 " from node: %s\n", atomic_read(&sess->nconn),
753 sess->sess_ops->InitiatorName);
754 spin_unlock_bh(&sess->conn_lock);
755
88dcd2da 756 iscsi_post_login_start_timers(conn);
e48354ce
NB		 757 /*
758 * Determine CPU mask to ensure connection's RX and TX kthreads
759 * are scheduled on the same CPU.
760 */
761 iscsit_thread_get_cpumask(conn);
762 conn->conn_rx_reset_cpumask = 1;
763 conn->conn_tx_reset_cpumask = 1;
e5419865
NB		 764 /*
765 * Wakeup the sleeping iscsi_target_rx_thread() now that
766 * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
767 */
768 complete(&conn->rx_login_comp);
e48354ce 769 iscsit_dec_conn_usage_count(conn);
e5419865 770
e48354ce
NB		 771 if (stop_timer) {
772 spin_lock_bh(&se_tpg->session_lock);
773 iscsit_stop_time2retain_timer(sess);
774 spin_unlock_bh(&se_tpg->session_lock);
775 }
776 iscsit_dec_session_usage_count(sess);
e5419865 777 return;
e48354ce
NB		 778 }
779
780 iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
781 iscsi_release_param_list(conn->param_list);
782 conn->param_list = NULL;
783
784 iscsit_determine_maxcmdsn(sess);
785
786 spin_lock_bh(&se_tpg->session_lock);
787 __transport_register_session(&sess->tpg->tpg_se_tpg,
8359cf43 788 se_sess->se_node_acl, se_sess, sess);
e48354ce
NB		 789 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
790 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
791
dc58f760
AG		 792 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
793 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
2f9bc894 794 tpg->tpgt);
e48354ce
NB		 795
796 spin_lock_bh(&sess->conn_lock);
797 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
798 atomic_inc(&sess->nconn);
799 pr_debug("Incremented iSCSI Connection count to %hu from node:"
800 " %s\n", atomic_read(&sess->nconn),
801 sess->sess_ops->InitiatorName);
802 spin_unlock_bh(&sess->conn_lock);
803
804 sess->sid = tpg->sid++;
805 if (!sess->sid)
806 sess->sid = tpg->sid++;
807 pr_debug("Established iSCSI session from node: %s\n",
808 sess->sess_ops->InitiatorName);
809
810 tpg->nsessions++;
811 if (tpg->tpg_tiqn)
812 tpg->tpg_tiqn->tiqn_nsessions++;
813
814 pr_debug("Incremented number of active iSCSI sessions to %u on"
815 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
816 spin_unlock_bh(&se_tpg->session_lock);
817
818 iscsi_post_login_start_timers(conn);
e48354ce
NB		 819 /*
820 * Determine CPU mask to ensure connection's RX and TX kthreads
821 * are scheduled on the same CPU.
822 */
823 iscsit_thread_get_cpumask(conn);
824 conn->conn_rx_reset_cpumask = 1;
825 conn->conn_tx_reset_cpumask = 1;
e5419865
NB		 826 /*
827 * Wakeup the sleeping iscsi_target_rx_thread() now that
828 * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
829 */
830 complete(&conn->rx_login_comp);
e48354ce 831 iscsit_dec_conn_usage_count(conn);
e48354ce
NB		 832}
833
834static void iscsi_handle_login_thread_timeout(unsigned long data)
835{
836 struct iscsi_np *np = (struct iscsi_np *) data;
837
838 spin_lock_bh(&np->np_thread_lock);
69d75574
AG		 839 pr_err("iSCSI Login timeout on Network Portal %pISpc\n",
840 &np->np_sockaddr);
e48354ce
NB		 841
842 if (np->np_login_timer_flags & ISCSI_TF_STOP) {
843 spin_unlock_bh(&np->np_thread_lock);
844 return;
845 }
846
847 if (np->np_thread)
848 send_sig(SIGINT, np->np_thread, 1);
849
850 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
851 spin_unlock_bh(&np->np_thread_lock);
852}
853
854static void iscsi_start_login_thread_timer(struct iscsi_np *np)
855{
856 /*
857 * This used the TA_LOGIN_TIMEOUT constant because at this
858 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
859 */
860 spin_lock_bh(&np->np_thread_lock);
861 init_timer(&np->np_login_timer);
862 np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
863 np->np_login_timer.data = (unsigned long)np;
864 np->np_login_timer.function = iscsi_handle_login_thread_timeout;
865 np->np_login_timer_flags &= ~ISCSI_TF_STOP;
866 np->np_login_timer_flags |= ISCSI_TF_RUNNING;
867 add_timer(&np->np_login_timer);
868
869 pr_debug("Added timeout timer to iSCSI login request for"
870 " %u seconds.\n", TA_LOGIN_TIMEOUT);
871 spin_unlock_bh(&np->np_thread_lock);
872}
873
874static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
875{
876 spin_lock_bh(&np->np_thread_lock);
877 if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
878 spin_unlock_bh(&np->np_thread_lock);
879 return;
880 }
881 np->np_login_timer_flags |= ISCSI_TF_STOP;
882 spin_unlock_bh(&np->np_thread_lock);
883
884 del_timer_sync(&np->np_login_timer);
885
886 spin_lock_bh(&np->np_thread_lock);
887 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
888 spin_unlock_bh(&np->np_thread_lock);
889}
890
baa4d64b 891int iscsit_setup_np(
e48354ce 892 struct iscsi_np *np,
13a3cf08 893 struct sockaddr_storage *sockaddr)
e48354ce 894{
baa4d64b 895 struct socket *sock = NULL;
837f6452 896 int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
e48354ce
NB		 897
898 switch (np->np_network_transport) {
899 case ISCSI_TCP:
900 np->np_ip_proto = IPPROTO_TCP;
901 np->np_sock_type = SOCK_STREAM;
902 break;
903 case ISCSI_SCTP_TCP:
904 np->np_ip_proto = IPPROTO_SCTP;
905 np->np_sock_type = SOCK_STREAM;
906 break;
907 case ISCSI_SCTP_UDP:
908 np->np_ip_proto = IPPROTO_SCTP;
909 np->np_sock_type = SOCK_SEQPACKET;
910 break;
e48354ce
NB		 911 default:
912 pr_err("Unsupported network_transport: %d\n",
913 np->np_network_transport);
914 return -EINVAL;
915 }
916
baa4d64b
NB		 917 np->np_ip_proto = IPPROTO_TCP;
918 np->np_sock_type = SOCK_STREAM;
919
e48354ce
NB		 920 ret = sock_create(sockaddr->ss_family, np->np_sock_type,
921 np->np_ip_proto, &sock);
922 if (ret < 0) {
923 pr_err("sock_create() failed.\n");
924 return ret;
925 }
926 np->np_socket = sock;
e48354ce
NB		 927 /*
928 * Setup the np->np_sockaddr from the passed sockaddr setup
929 * in iscsi_target_configfs.c code..
930 */
8359cf43 931 memcpy(&np->np_sockaddr, sockaddr,
13a3cf08 932 sizeof(struct sockaddr_storage));
e48354ce
NB		 933
934 if (sockaddr->ss_family == AF_INET6)
935 len = sizeof(struct sockaddr_in6);
936 else
937 len = sizeof(struct sockaddr_in);
938 /*
939 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
940 */
8359cf43 941 /* FIXME: Someone please explain why this is endian-safe */
e48354ce
NB		 942 opt = 1;
943 if (np->np_network_transport == ISCSI_TCP) {
944 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
945 (char *)&opt, sizeof(opt));
946 if (ret < 0) {
947 pr_err("kernel_setsockopt() for TCP_NODELAY"
948 " failed: %d\n", ret);
949 goto fail;
950 }
951 }
952
8359cf43 953 /* FIXME: Someone please explain why this is endian-safe */
e48354ce
NB		 954 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
955 (char *)&opt, sizeof(opt));
956 if (ret < 0) {
957 pr_err("kernel_setsockopt() for SO_REUSEADDR"
958 " failed\n");
959 goto fail;
960 }
961
9f9ef6d3
DK		 962 ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
963 (char *)&opt, sizeof(opt));
964 if (ret < 0) {
965 pr_err("kernel_setsockopt() for IP_FREEBIND"
966 " failed\n");
967 goto fail;
968 }
969
e48354ce
NB		 970 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
971 if (ret < 0) {
972 pr_err("kernel_bind() failed: %d\n", ret);
973 goto fail;
974 }
975
976 ret = kernel_listen(sock, backlog);
977 if (ret != 0) {
978 pr_err("kernel_listen() failed: %d\n", ret);
979 goto fail;
980 }
981
982 return 0;
e48354ce
NB		 983fail:
984 np->np_socket = NULL;
94e16e9c 985 sock_release(sock);
e48354ce
NB		 986 return ret;
987}
988
baa4d64b
NB		 989int iscsi_target_setup_login_socket(
990 struct iscsi_np *np,
13a3cf08 991 struct sockaddr_storage *sockaddr)
baa4d64b
NB		 992{
993 struct iscsit_transport *t;
994 int rc;
995
996 t = iscsit_get_transport(np->np_network_transport);
997 if (!t)
998 return -EINVAL;
999
1000 rc = t->iscsit_setup_np(np, sockaddr);
1001 if (rc < 0) {
1002 iscsit_put_transport(t);
1003 return rc;
1004 }
1005
1006 np->np_transport = t;
14f4b54f 1007 np->enabled = true;
baa4d64b
NB		 1008 return 0;
1009}
1010
1011int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1012{
1013 struct socket *new_sock, *sock = np->np_socket;
1014 struct sockaddr_in sock_in;
1015 struct sockaddr_in6 sock_in6;
1016 int rc, err;
1017
1018 rc = kernel_accept(sock, &new_sock, 0);
1019 if (rc < 0)
1020 return rc;
1021
1022 conn->sock = new_sock;
1023 conn->login_family = np->np_sockaddr.ss_family;
baa4d64b
NB		 1024
1025 if (np->np_sockaddr.ss_family == AF_INET6) {
1026 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1027
1028 rc = conn->sock->ops->getname(conn->sock,
1029 (struct sockaddr *)&sock_in6, &err, 1);
1030 if (!rc) {
dc58f760
AG		 1031 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1032 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
1033 } else {
1034 /* Pretend to be an ipv4 socket */
1035 sock_in.sin_family = AF_INET;
1036 sock_in.sin_port = sock_in6.sin6_port;
1037 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1038 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1039 }
baa4d64b
NB		 1040 }
1041
1042 rc = conn->sock->ops->getname(conn->sock,
1043 (struct sockaddr *)&sock_in6, &err, 0);
1044 if (!rc) {
69d75574
AG		 1045 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1046 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
1047 } else {
1048 /* Pretend to be an ipv4 socket */
1049 sock_in.sin_family = AF_INET;
1050 sock_in.sin_port = sock_in6.sin6_port;
1051 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1052 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1053 }
baa4d64b
NB		 1054 }
1055 } else {
1056 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1057
1058 rc = conn->sock->ops->getname(conn->sock,
1059 (struct sockaddr *)&sock_in, &err, 1);
dc58f760
AG		 1060 if (!rc)
1061 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
baa4d64b
NB		 1062
1063 rc = conn->sock->ops->getname(conn->sock,
1064 (struct sockaddr *)&sock_in, &err, 0);
69d75574
AG		 1065 if (!rc)
1066 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
baa4d64b
NB		 1067 }
1068
1069 return 0;
1070}
1071
1072int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1073{
1074 struct iscsi_login_req *login_req;
1075 u32 padding = 0, payload_length;
1076
1077 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1078 return -1;
1079
1080 login_req = (struct iscsi_login_req *)login->req;
1081 payload_length = ntoh24(login_req->dlength);
1082 padding = ((-payload_length) & 3);
1083
1084 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1085 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1086 login_req->flags, login_req->itt, login_req->cmdsn,
1087 login_req->exp_statsn, login_req->cid, payload_length);
1088 /*
1089 * Setup the initial iscsi_login values from the leading
1090 * login request PDU.
1091 */
1092 if (login->first_request) {
1093 login_req = (struct iscsi_login_req *)login->req;
1094 login->leading_connection = (!login_req->tsih) ? 1 : 0;
3e1c81a9 1095 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
baa4d64b
NB		 1096 login->version_min = login_req->min_version;
1097 login->version_max = login_req->max_version;
1098 memcpy(login->isid, login_req->isid, 6);
1099 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1100 login->init_task_tag = login_req->itt;
1101 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1102 login->cid = be16_to_cpu(login_req->cid);
1103 login->tsih = be16_to_cpu(login_req->tsih);
1104 }
1105
1106 if (iscsi_target_check_login_request(conn, login) < 0)
1107 return -1;
1108
1109 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1110 if (iscsi_login_rx_data(conn, login->req_buf,
1111 payload_length + padding) < 0)
1112 return -1;
1113
1114 return 0;
1115}
1116
1117int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1118 u32 length)
1119{
1120 if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1121 return -1;
1122
1123 return 0;
1124}
1125
1126static int
1127iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1128{
1129 int rc;
1130
1131 if (!t->owner) {
1132 conn->conn_transport = t;
1133 return 0;
1134 }
1135
1136 rc = try_module_get(t->owner);
1137 if (!rc) {
1138 pr_err("try_module_get() failed for %s\n", t->name);
1139 return -EINVAL;
1140 }
1141
1142 conn->conn_transport = t;
1143 return 0;
1144}
1145
a91eb7d9
NB		 1146void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1147 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1148{
0bcc297e 1149 if (!new_sess)
a91eb7d9
NB		 1150 goto old_sess_out;
1151
1152 pr_err("iSCSI Login negotiation failed.\n");
1153 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1154 ISCSI_LOGIN_STATUS_INIT_ERR);
1155 if (!zero_tsih || !conn->sess)
1156 goto old_sess_out;
1157 if (conn->sess->se_sess)
1158 transport_free_session(conn->sess->se_sess);
1159 if (conn->sess->session_index != 0) {
1160 spin_lock_bh(&sess_idr_lock);
1161 idr_remove(&sess_idr, conn->sess->session_index);
1162 spin_unlock_bh(&sess_idr_lock);
1163 }
1164 kfree(conn->sess->sess_ops);
1165 kfree(conn->sess);
a0b3b9b2 1166 conn->sess = NULL;
a91eb7d9
NB		 1167
1168old_sess_out:
1169 iscsi_stop_login_thread_timer(np);
1170 /*
1171 * If login negotiation fails check if the Time2Retain timer
1172 * needs to be restarted.
1173 */
1174 if (!zero_tsih && conn->sess) {
1175 spin_lock_bh(&conn->sess->conn_lock);
1176 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1177 struct se_portal_group *se_tpg =
60bfcf8e 1178 &conn->tpg->tpg_se_tpg;
a91eb7d9
NB		 1179
1180 atomic_set(&conn->sess->session_continuation, 0);
1181 spin_unlock_bh(&conn->sess->conn_lock);
1182 spin_lock_bh(&se_tpg->session_lock);
1183 iscsit_start_time2retain_handler(conn->sess);
1184 spin_unlock_bh(&se_tpg->session_lock);
1185 } else
1186 spin_unlock_bh(&conn->sess->conn_lock);
1187 iscsit_dec_session_usage_count(conn->sess);
1188 }
1189
69110e3c
HX		 1190 ahash_request_free(conn->conn_tx_hash);
1191 if (conn->conn_rx_hash) {
1192 struct crypto_ahash *tfm;
1193
1194 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
1195 ahash_request_free(conn->conn_rx_hash);
1196 crypto_free_ahash(tfm);
1197 }
a91eb7d9 1198
fbecb659 1199 free_cpumask_var(conn->conn_cpumask);
a91eb7d9
NB		 1200
1201 kfree(conn->conn_ops);
1202
1203 if (conn->param_list) {
1204 iscsi_release_param_list(conn->param_list);
1205 conn->param_list = NULL;
1206 }
1207 iscsi_target_nego_release(conn);
1208
1209 if (conn->sock) {
1210 sock_release(conn->sock);
1211 conn->sock = NULL;
1212 }
1213
954f2372
SG		 1214 if (conn->conn_transport->iscsit_wait_conn)
1215 conn->conn_transport->iscsit_wait_conn(conn);
1216
a91eb7d9
NB		 1217 if (conn->conn_transport->iscsit_free_conn)
1218 conn->conn_transport->iscsit_free_conn(conn);
1219
1220 iscsit_put_transport(conn->conn_transport);
1221 kfree(conn);
1222}
1223
e48354ce
NB		 1224static int __iscsi_target_login_thread(struct iscsi_np *np)
1225{
baa4d64b 1226 u8 *buffer, zero_tsih = 0;
81a9c5e7 1227 int ret = 0, rc;
e48354ce
NB		 1228 struct iscsi_conn *conn = NULL;
1229 struct iscsi_login *login;
1230 struct iscsi_portal_group *tpg = NULL;
e48354ce 1231 struct iscsi_login_req *pdu;
a91eb7d9
NB		 1232 struct iscsi_tpg_np *tpg_np;
1233 bool new_sess = false;
e48354ce
NB		 1234
1235 flush_signals(current);
e48354ce
NB		 1236
1237 spin_lock_bh(&np->np_thread_lock);
1238 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1239 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1240 complete(&np->np_restart_comp);
81a9c5e7
MP		 1241 } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1242 spin_unlock_bh(&np->np_thread_lock);
1243 goto exit;
e48354ce
NB		 1244 } else {
1245 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1246 }
1247 spin_unlock_bh(&np->np_thread_lock);
1248
e48354ce
NB		 1249 conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1250 if (!conn) {
1251 pr_err("Could not allocate memory for"
1252 " new connection\n");
e48354ce
NB		 1253 /* Get another socket */
1254 return 1;
1255 }
e48354ce
NB		 1256 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1257 conn->conn_state = TARG_CONN_STATE_FREE;
e48354ce 1258
baa4d64b
NB		 1259 if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1260 kfree(conn);
1261 return 1;
1262 }
e48354ce 1263
baa4d64b
NB		 1264 rc = np->np_transport->iscsit_accept_np(np, conn);
1265 if (rc == -ENOSYS) {
1266 complete(&np->np_restart_comp);
1267 iscsit_put_transport(conn->conn_transport);
1268 kfree(conn);
1269 conn = NULL;
1270 goto exit;
1271 } else if (rc < 0) {
1272 spin_lock_bh(&np->np_thread_lock);
1273 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1274 spin_unlock_bh(&np->np_thread_lock);
1275 complete(&np->np_restart_comp);
c9a03c12
NB		 1276 iscsit_put_transport(conn->conn_transport);
1277 kfree(conn);
1278 conn = NULL;
baa4d64b
NB		 1279 /* Get another socket */
1280 return 1;
1281 }
1282 spin_unlock_bh(&np->np_thread_lock);
1283 iscsit_put_transport(conn->conn_transport);
1284 kfree(conn);
1285 conn = NULL;
1286 goto out;
e48354ce
NB		 1287 }
1288 /*
1289 * Perform the remaining iSCSI connection initialization items..
1290 */
baa4d64b
NB		 1291 login = iscsi_login_init_conn(conn);
1292 if (!login) {
e48354ce
NB		 1293 goto new_sess_out;
1294 }
1295
baa4d64b 1296 iscsi_start_login_thread_timer(np);
e48354ce 1297
baa4d64b
NB		 1298 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1299 conn->conn_state = TARG_CONN_STATE_XPT_UP;
1300 /*
1301 * This will process the first login request + payload..
1302 */
1303 rc = np->np_transport->iscsit_get_login_rx(conn, login);
1304 if (rc == 1)
1305 return 1;
1306 else if (rc < 0)
1307 goto new_sess_out;
66c7db68 1308
baa4d64b
NB		 1309 buffer = &login->req[0];
1310 pdu = (struct iscsi_login_req *)buffer;
e48354ce
NB		 1311 /*
1312 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1313 * when Status-Class != 0.
1314 */
baa4d64b 1315 conn->login_itt = pdu->itt;
e48354ce
NB		 1316
1317 spin_lock_bh(&np->np_thread_lock);
1318 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1319 spin_unlock_bh(&np->np_thread_lock);
69d75574
AG		 1320 pr_err("iSCSI Network Portal on %pISpc currently not"
1321 " active.\n", &np->np_sockaddr);
e48354ce
NB		 1322 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1323 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1324 goto new_sess_out;
1325 }
1326 spin_unlock_bh(&np->np_thread_lock);
1327
e48354ce
NB		 1328 conn->network_transport = np->np_network_transport;
1329
dc58f760
AG		 1330 pr_debug("Received iSCSI login request from %pISpc on %s Network"
1331 " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name,
69d75574 1332 &conn->local_sockaddr);
e48354ce
NB		 1333
1334 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1335 conn->conn_state = TARG_CONN_STATE_IN_LOGIN;
1336
1337 if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1338 pdu->min_version) < 0)
1339 goto new_sess_out;
1340
1341 zero_tsih = (pdu->tsih == 0x0000);
ee1b1b9c 1342 if (zero_tsih) {
e48354ce
NB		 1343 /*
1344 * This is the leading connection of a new session.
1345 * We wait until after authentication to check for
1346 * session reinstatement.
1347 */
1348 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1349 goto new_sess_out;
1350 } else {
1351 /*
1352 * Add a new connection to an existing session.
1353 * We check for a non-existant session in
1354 * iscsi_login_non_zero_tsih_s2() below based
1355 * on ISID/TSIH, but wait until after authentication
1356 * to check for connection reinstatement, etc.
1357 */
1358 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1359 goto new_sess_out;
1360 }
e48354ce 1361 /*
baa4d64b
NB		 1362 * SessionType: Discovery
1363 *
1364 * Locates Default Portal
1365 *
1366 * SessionType: Normal
1367 *
1368 * Locates Target Portal from NP -> Target IQN
e48354ce 1369 */
baa4d64b
NB		 1370 rc = iscsi_target_locate_portal(np, conn, login);
1371 if (rc < 0) {
e48354ce
NB		 1372 tpg = conn->tpg;
1373 goto new_sess_out;
1374 }
a91eb7d9 1375 login->zero_tsih = zero_tsih;
e48354ce 1376
8abc718d
FL		 1377 if (conn->sess)
1378 conn->sess->se_sess->sup_prot_ops =
1379 conn->conn_transport->iscsit_get_sup_prot_ops(conn);
23a548ee 1380
e48354ce
NB		 1381 tpg = conn->tpg;
1382 if (!tpg) {
1383 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1384 goto new_sess_out;
1385 }
1386
1387 if (zero_tsih) {
baa4d64b 1388 if (iscsi_login_zero_tsih_s2(conn) < 0)
e48354ce 1389 goto new_sess_out;
e48354ce 1390 } else {
baa4d64b 1391 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
e48354ce 1392 goto old_sess_out;
e48354ce
NB		 1393 }
1394
42bc3e57
VP		 1395 if (conn->conn_transport->iscsit_validate_params) {
1396 ret = conn->conn_transport->iscsit_validate_params(conn);
1397 if (ret < 0) {
1398 if (zero_tsih)
1399 goto new_sess_out;
1400 else
1401 goto old_sess_out;
1402 }
1403 }
1404
a91eb7d9
NB		 1405 ret = iscsi_target_start_negotiation(login, conn);
1406 if (ret < 0)
e48354ce
NB		 1407 goto new_sess_out;
1408
e48354ce
NB		 1409 iscsi_stop_login_thread_timer(np);
1410
a91eb7d9
NB		 1411 if (ret == 1) {
1412 tpg_np = conn->tpg_np;
e48354ce 1413
e5419865 1414 iscsi_post_login_handler(np, conn, zero_tsih);
a91eb7d9
NB		 1415 iscsit_deaccess_np(np, tpg, tpg_np);
1416 }
e48354ce 1417
e48354ce 1418 tpg = NULL;
a91eb7d9 1419 tpg_np = NULL;
e48354ce
NB		 1420 /* Get another socket */
1421 return 1;
1422
1423new_sess_out:
a91eb7d9 1424 new_sess = true;
e48354ce 1425old_sess_out:
a91eb7d9
NB		 1426 tpg_np = conn->tpg_np;
1427 iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1428 new_sess = false;
e48354ce
NB		 1429
1430 if (tpg) {
a91eb7d9 1431 iscsit_deaccess_np(np, tpg, tpg_np);
e48354ce 1432 tpg = NULL;
a91eb7d9 1433 tpg_np = NULL;
e48354ce
NB		 1434 }
1435
1436out:
81a9c5e7
MP		 1437 return 1;
1438
baa4d64b 1439exit:
e48354ce
NB		 1440 iscsi_stop_login_thread_timer(np);
1441 spin_lock_bh(&np->np_thread_lock);
1442 np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1443 spin_unlock_bh(&np->np_thread_lock);
baa4d64b 1444
e48354ce
NB		 1445 return 0;
1446}
1447
1448int iscsi_target_login_thread(void *arg)
1449{
8359cf43 1450 struct iscsi_np *np = arg;
e48354ce
NB		 1451 int ret;
1452
1453 allow_signal(SIGINT);
1454
81a9c5e7 1455 while (1) {
e48354ce
NB		 1456 ret = __iscsi_target_login_thread(np);
1457 /*
1458 * We break and exit here unless another sock_accept() call
1459 * is expected.
1460 */
1461 if (ret != 1)
1462 break;
1463 }
1464
1465 return 0;
1466}
Linux 6.x block layer and io_uring tree(s)