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Merge tag 'mmc-v4.2' of git://git.linaro.org/people/ulf.hansson/mmc
[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
19#include <linux/string.h>
20#include <linux/kthread.h>
21#include <linux/crypto.h>
40401530 22#include <linux/idr.h>
e48354ce
NB		 23#include <scsi/iscsi_proto.h>
24#include <target/target_core_base.h>
c4795fb2 25#include <target/target_core_fabric.h>
e48354ce 26
67f091f2
SG		 27#include <target/iscsi/iscsi_target_core.h>
28#include <target/iscsi/iscsi_target_stat.h>
e48354ce
NB		 29#include "iscsi_target_device.h"
30#include "iscsi_target_nego.h"
31#include "iscsi_target_erl0.h"
32#include "iscsi_target_erl2.h"
33#include "iscsi_target_login.h"
e48354ce
NB		 34#include "iscsi_target_tpg.h"
35#include "iscsi_target_util.h"
36#include "iscsi_target.h"
37#include "iscsi_target_parameters.h"
38
baa4d64b
NB		 39#include <target/iscsi/iscsi_transport.h>
40
41static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
e48354ce 42{
baa4d64b
NB		 43 struct iscsi_login *login;
44
45 login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
46 if (!login) {
47 pr_err("Unable to allocate memory for struct iscsi_login.\n");
48 return NULL;
49 }
a91eb7d9 50 conn->login = login;
baa4d64b
NB		 51 login->conn = conn;
52 login->first_request = 1;
53
54 login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
55 if (!login->req_buf) {
56 pr_err("Unable to allocate memory for response buffer.\n");
57 goto out_login;
58 }
59
60 login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
61 if (!login->rsp_buf) {
62 pr_err("Unable to allocate memory for request buffer.\n");
63 goto out_req_buf;
64 }
65
66 conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
67 if (!conn->conn_ops) {
68 pr_err("Unable to allocate memory for"
69 " struct iscsi_conn_ops.\n");
70 goto out_rsp_buf;
71 }
72
d5627acb 73 init_waitqueue_head(&conn->queues_wq);
e48354ce
NB		 74 INIT_LIST_HEAD(&conn->conn_list);
75 INIT_LIST_HEAD(&conn->conn_cmd_list);
76 INIT_LIST_HEAD(&conn->immed_queue_list);
77 INIT_LIST_HEAD(&conn->response_queue_list);
78 init_completion(&conn->conn_post_wait_comp);
79 init_completion(&conn->conn_wait_comp);
80 init_completion(&conn->conn_wait_rcfr_comp);
81 init_completion(&conn->conn_waiting_on_uc_comp);
82 init_completion(&conn->conn_logout_comp);
83 init_completion(&conn->rx_half_close_comp);
84 init_completion(&conn->tx_half_close_comp);
85 spin_lock_init(&conn->cmd_lock);
86 spin_lock_init(&conn->conn_usage_lock);
87 spin_lock_init(&conn->immed_queue_lock);
88 spin_lock_init(&conn->nopin_timer_lock);
89 spin_lock_init(&conn->response_queue_lock);
90 spin_lock_init(&conn->state_lock);
91
92 if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
93 pr_err("Unable to allocate conn->conn_cpumask\n");
baa4d64b 94 goto out_conn_ops;
e48354ce 95 }
baa4d64b 96 conn->conn_login = login;
e48354ce 97
baa4d64b
NB		 98 return login;
99
100out_conn_ops:
101 kfree(conn->conn_ops);
102out_rsp_buf:
103 kfree(login->rsp_buf);
104out_req_buf:
105 kfree(login->req_buf);
106out_login:
107 kfree(login);
108 return NULL;
e48354ce
NB		 109}
110
111/*
112 * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
113 * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
114 */
115int iscsi_login_setup_crypto(struct iscsi_conn *conn)
116{
117 /*
118 * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
119 * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
120 * to software 1x8 byte slicing from crc32c.ko
121 */
122 conn->conn_rx_hash.flags = 0;
123 conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
124 CRYPTO_ALG_ASYNC);
125 if (IS_ERR(conn->conn_rx_hash.tfm)) {
126 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
127 return -ENOMEM;
128 }
129
130 conn->conn_tx_hash.flags = 0;
131 conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
132 CRYPTO_ALG_ASYNC);
133 if (IS_ERR(conn->conn_tx_hash.tfm)) {
134 pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n");
135 crypto_free_hash(conn->conn_rx_hash.tfm);
136 return -ENOMEM;
137 }
138
139 return 0;
140}
141
142static int iscsi_login_check_initiator_version(
143 struct iscsi_conn *conn,
144 u8 version_max,
145 u8 version_min)
146{
147 if ((version_max != 0x00) || (version_min != 0x00)) {
148 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
149 " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
150 version_min, version_max);
151 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
152 ISCSI_LOGIN_STATUS_NO_VERSION);
153 return -1;
154 }
155
156 return 0;
157}
158
159int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
160{
161 int sessiontype;
162 struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
163 struct iscsi_portal_group *tpg = conn->tpg;
164 struct iscsi_session *sess = NULL, *sess_p = NULL;
165 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
166 struct se_session *se_sess, *se_sess_tmp;
167
168 initiatorname_param = iscsi_find_param_from_key(
169 INITIATORNAME, conn->param_list);
e48354ce
NB		 170 sessiontype_param = iscsi_find_param_from_key(
171 SESSIONTYPE, conn->param_list);
1c5c12c6
RD		 172 if (!initiatorname_param || !sessiontype_param) {
173 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
174 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
e48354ce 175 return -1;
1c5c12c6 176 }
e48354ce
NB		 177
178 sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
179
180 spin_lock_bh(&se_tpg->session_lock);
181 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
182 sess_list) {
183
8359cf43 184 sess_p = se_sess->fabric_sess_ptr;
e48354ce
NB		 185 spin_lock(&sess_p->conn_lock);
186 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
187 atomic_read(&sess_p->session_logout) ||
188 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
189 spin_unlock(&sess_p->conn_lock);
190 continue;
191 }
8359cf43
JE		 192 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
193 (!strcmp(sess_p->sess_ops->InitiatorName,
194 initiatorname_param->value) &&
e48354ce
NB		 195 (sess_p->sess_ops->SessionType == sessiontype))) {
196 atomic_set(&sess_p->session_reinstatement, 1);
197 spin_unlock(&sess_p->conn_lock);
198 iscsit_inc_session_usage_count(sess_p);
199 iscsit_stop_time2retain_timer(sess_p);
200 sess = sess_p;
201 break;
202 }
203 spin_unlock(&sess_p->conn_lock);
204 }
205 spin_unlock_bh(&se_tpg->session_lock);
206 /*
207 * If the Time2Retain handler has expired, the session is already gone.
208 */
209 if (!sess)
210 return 0;
211
212 pr_debug("%s iSCSI Session SID %u is still active for %s,"
213 " preforming session reinstatement.\n", (sessiontype) ?
214 "Discovery" : "Normal", sess->sid,
215 sess->sess_ops->InitiatorName);
216
217 spin_lock_bh(&sess->conn_lock);
218 if (sess->session_state == TARG_SESS_STATE_FAILED) {
219 spin_unlock_bh(&sess->conn_lock);
220 iscsit_dec_session_usage_count(sess);
99367f01
NB		 221 target_put_session(sess->se_sess);
222 return 0;
e48354ce
NB		 223 }
224 spin_unlock_bh(&sess->conn_lock);
225
226 iscsit_stop_session(sess, 1, 1);
227 iscsit_dec_session_usage_count(sess);
228
99367f01
NB		 229 target_put_session(sess->se_sess);
230 return 0;
e48354ce
NB		 231}
232
233static void iscsi_login_set_conn_values(
234 struct iscsi_session *sess,
235 struct iscsi_conn *conn,
50e5c87d 236 __be16 cid)
e48354ce
NB		 237{
238 conn->sess = sess;
50e5c87d 239 conn->cid = be16_to_cpu(cid);
e48354ce
NB		 240 /*
241 * Generate a random Status sequence number (statsn) for the new
242 * iSCSI connection.
243 */
244 get_random_bytes(&conn->stat_sn, sizeof(u32));
245
246 mutex_lock(&auth_id_lock);
247 conn->auth_id = iscsit_global->auth_id++;
248 mutex_unlock(&auth_id_lock);
249}
250
79d59d08
RD		 251static __printf(2, 3) int iscsi_change_param_sprintf(
252 struct iscsi_conn *conn,
253 const char *fmt, ...)
254{
255 va_list args;
256 unsigned char buf[64];
257
258 memset(buf, 0, sizeof buf);
259
260 va_start(args, fmt);
261 vsnprintf(buf, sizeof buf, fmt, args);
262 va_end(args);
263
264 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
265 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
266 ISCSI_LOGIN_STATUS_NO_RESOURCES);
267 return -1;
268 }
269
270 return 0;
271}
272
e48354ce
NB		 273/*
274 * This is the leading connection of a new session,
275 * or session reinstatement.
276 */
277static int iscsi_login_zero_tsih_s1(
278 struct iscsi_conn *conn,
279 unsigned char *buf)
280{
281 struct iscsi_session *sess = NULL;
282 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
13b5533a 283 int ret;
e48354ce
NB		 284
285 sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
286 if (!sess) {
287 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
288 ISCSI_LOGIN_STATUS_NO_RESOURCES);
289 pr_err("Could not allocate memory for session\n");
0957627a 290 return -ENOMEM;
e48354ce
NB		 291 }
292
293 iscsi_login_set_conn_values(sess, conn, pdu->cid);
294 sess->init_task_tag = pdu->itt;
8359cf43 295 memcpy(&sess->isid, pdu->isid, 6);
50e5c87d 296 sess->exp_cmd_sn = be32_to_cpu(pdu->cmdsn);
e48354ce
NB		 297 INIT_LIST_HEAD(&sess->sess_conn_list);
298 INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
299 INIT_LIST_HEAD(&sess->cr_active_list);
300 INIT_LIST_HEAD(&sess->cr_inactive_list);
301 init_completion(&sess->async_msg_comp);
302 init_completion(&sess->reinstatement_comp);
303 init_completion(&sess->session_wait_comp);
304 init_completion(&sess->session_waiting_on_uc_comp);
305 mutex_init(&sess->cmdsn_mutex);
306 spin_lock_init(&sess->conn_lock);
307 spin_lock_init(&sess->cr_a_lock);
308 spin_lock_init(&sess->cr_i_lock);
309 spin_lock_init(&sess->session_usage_lock);
310 spin_lock_init(&sess->ttt_lock);
311
c9365bd0 312 idr_preload(GFP_KERNEL);
998866b0 313 spin_lock_bh(&sess_idr_lock);
c9365bd0
TH		 314 ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
315 if (ret >= 0)
316 sess->session_index = ret;
998866b0 317 spin_unlock_bh(&sess_idr_lock);
c9365bd0 318 idr_preload_end();
e48354ce 319
13b5533a 320 if (ret < 0) {
c9365bd0 321 pr_err("idr_alloc() for sess_idr failed\n");
13b5533a
BW		 322 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
323 ISCSI_LOGIN_STATUS_NO_RESOURCES);
324 kfree(sess);
325 return -ENOMEM;
326 }
327
e48354ce 328 sess->creation_time = get_jiffies_64();
e48354ce
NB		 329 /*
330 * The FFP CmdSN window values will be allocated from the TPG's
331 * Initiator Node's ACL once the login has been successfully completed.
332 */
50e5c87d 333 sess->max_cmd_sn = be32_to_cpu(pdu->cmdsn);
e48354ce
NB		 334
335 sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
336 if (!sess->sess_ops) {
337 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
338 ISCSI_LOGIN_STATUS_NO_RESOURCES);
339 pr_err("Unable to allocate memory for"
340 " struct iscsi_sess_ops.\n");
0957627a
NB		 341 kfree(sess);
342 return -ENOMEM;
e48354ce
NB		 343 }
344
23a548ee 345 sess->se_sess = transport_init_session(TARGET_PROT_NORMAL);
0957627a 346 if (IS_ERR(sess->se_sess)) {
e48354ce
NB		 347 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
348 ISCSI_LOGIN_STATUS_NO_RESOURCES);
a928d28d 349 kfree(sess->sess_ops);
0957627a
NB		 350 kfree(sess);
351 return -ENOMEM;
e48354ce
NB		 352 }
353
354 return 0;
355}
356
357static int iscsi_login_zero_tsih_s2(
358 struct iscsi_conn *conn)
359{
360 struct iscsi_node_attrib *na;
361 struct iscsi_session *sess = conn->sess;
03aa2070 362 bool iser = false;
e48354ce
NB		 363
364 sess->tpg = conn->tpg;
365
366 /*
367 * Assign a new TPG Session Handle. Note this is protected with
368 * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
369 */
60bfcf8e 370 sess->tsih = ++sess->tpg->ntsih;
e48354ce 371 if (!sess->tsih)
60bfcf8e 372 sess->tsih = ++sess->tpg->ntsih;
e48354ce
NB		 373
374 /*
375 * Create the default params from user defined values..
376 */
377 if (iscsi_copy_param_list(&conn->param_list,
60bfcf8e 378 conn->tpg->param_list, 1) < 0) {
e48354ce
NB		 379 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
380 ISCSI_LOGIN_STATUS_NO_RESOURCES);
381 return -1;
382 }
383
03aa2070
NB		 384 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
385 iser = true;
386
387 iscsi_set_keys_to_negotiate(conn->param_list, iser);
e48354ce
NB		 388
389 if (sess->sess_ops->SessionType)
390 return iscsi_set_keys_irrelevant_for_discovery(
391 conn->param_list);
392
393 na = iscsit_tpg_get_node_attrib(sess);
394
395 /*
396 * Need to send TargetPortalGroupTag back in first login response
397 * on any iSCSI connection where the Initiator provides TargetName.
398 * See 5.3.1. Login Phase Start
399 *
400 * In our case, we have already located the struct iscsi_tiqn at this point.
401 */
79d59d08 402 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
e48354ce 403 return -1;
e48354ce
NB		 404
405 /*
406 * Workaround for Initiators that have broken connection recovery logic.
407 *
408 * "We would really like to get rid of this." Linux-iSCSI.org team
409 */
79d59d08 410 if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
e48354ce 411 return -1;
e48354ce
NB		 412
413 if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
414 return -1;
03aa2070
NB		 415 /*
416 * Set RDMAExtensions=Yes by default for iSER enabled network portals
417 */
418 if (iser) {
419 struct iscsi_param *param;
420 unsigned long mrdsl, off;
421 int rc;
422
79d59d08 423 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
03aa2070 424 return -1;
79d59d08 425
03aa2070
NB		 426 /*
427 * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
428 * Immediate Data + Unsolicitied Data-OUT if necessary..
429 */
430 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
431 conn->param_list);
432 if (!param) {
433 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
434 ISCSI_LOGIN_STATUS_NO_RESOURCES);
435 return -1;
436 }
57103d7f 437 rc = kstrtoul(param->value, 0, &mrdsl);
03aa2070
NB		 438 if (rc < 0) {
439 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
440 ISCSI_LOGIN_STATUS_NO_RESOURCES);
441 return -1;
442 }
443 off = mrdsl % PAGE_SIZE;
444 if (!off)
52d0aa79 445 goto check_prot;
03aa2070
NB		 446
447 if (mrdsl < PAGE_SIZE)
448 mrdsl = PAGE_SIZE;
449 else
450 mrdsl -= off;
451
452 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
453 " to PAGE_SIZE\n", mrdsl);
454
79d59d08 455 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
03aa2070 456 return -1;
52d0aa79
NB		 457 /*
458 * ISER currently requires that ImmediateData + Unsolicited
459 * Data be disabled when protection / signature MRs are enabled.
460 */
461check_prot:
462 if (sess->se_sess->sup_prot_ops &
463 (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
464 TARGET_PROT_DOUT_INSERT)) {
465
79d59d08 466 if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
52d0aa79 467 return -1;
52d0aa79 468
79d59d08 469 if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
52d0aa79 470 return -1;
79d59d08 471
52d0aa79
NB		 472 pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
473 " T10-PI enabled ISER session\n");
474 }
03aa2070 475 }
e48354ce
NB		 476
477 return 0;
478}
479
480/*
481 * Remove PSTATE_NEGOTIATE for the four FIM related keys.
482 * The Initiator node will be able to enable FIM by proposing them itself.
483 */
484int iscsi_login_disable_FIM_keys(
485 struct iscsi_param_list *param_list,
486 struct iscsi_conn *conn)
487{
488 struct iscsi_param *param;
489
490 param = iscsi_find_param_from_key("OFMarker", param_list);
491 if (!param) {
492 pr_err("iscsi_find_param_from_key() for"
493 " OFMarker failed\n");
494 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
495 ISCSI_LOGIN_STATUS_NO_RESOURCES);
496 return -1;
497 }
498 param->state &= ~PSTATE_NEGOTIATE;
499
500 param = iscsi_find_param_from_key("OFMarkInt", param_list);
501 if (!param) {
502 pr_err("iscsi_find_param_from_key() for"
503 " IFMarker failed\n");
504 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
505 ISCSI_LOGIN_STATUS_NO_RESOURCES);
506 return -1;
507 }
508 param->state &= ~PSTATE_NEGOTIATE;
509
510 param = iscsi_find_param_from_key("IFMarker", param_list);
511 if (!param) {
512 pr_err("iscsi_find_param_from_key() for"
513 " IFMarker failed\n");
514 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
515 ISCSI_LOGIN_STATUS_NO_RESOURCES);
516 return -1;
517 }
518 param->state &= ~PSTATE_NEGOTIATE;
519
520 param = iscsi_find_param_from_key("IFMarkInt", param_list);
521 if (!param) {
522 pr_err("iscsi_find_param_from_key() for"
523 " IFMarker failed\n");
524 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
525 ISCSI_LOGIN_STATUS_NO_RESOURCES);
526 return -1;
527 }
528 param->state &= ~PSTATE_NEGOTIATE;
529
530 return 0;
531}
532
533static int iscsi_login_non_zero_tsih_s1(
534 struct iscsi_conn *conn,
535 unsigned char *buf)
536{
537 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
538
539 iscsi_login_set_conn_values(NULL, conn, pdu->cid);
540 return 0;
541}
542
543/*
544 * Add a new connection to an existing session.
545 */
546static int iscsi_login_non_zero_tsih_s2(
547 struct iscsi_conn *conn,
548 unsigned char *buf)
549{
550 struct iscsi_portal_group *tpg = conn->tpg;
551 struct iscsi_session *sess = NULL, *sess_p = NULL;
552 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
553 struct se_session *se_sess, *se_sess_tmp;
554 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
03aa2070 555 bool iser = false;
e48354ce
NB		 556
557 spin_lock_bh(&se_tpg->session_lock);
558 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
559 sess_list) {
560
561 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
562 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
563 atomic_read(&sess_p->session_logout) ||
564 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
565 continue;
8359cf43 566 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
50e5c87d 567 (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
e48354ce
NB		 568 iscsit_inc_session_usage_count(sess_p);
569 iscsit_stop_time2retain_timer(sess_p);
570 sess = sess_p;
571 break;
572 }
573 }
574 spin_unlock_bh(&se_tpg->session_lock);
575
576 /*
577 * If the Time2Retain handler has expired, the session is already gone.
578 */
579 if (!sess) {
580 pr_err("Initiator attempting to add a connection to"
581 " a non-existent session, rejecting iSCSI Login.\n");
582 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
583 ISCSI_LOGIN_STATUS_NO_SESSION);
584 return -1;
585 }
586
587 /*
588 * Stop the Time2Retain timer if this is a failed session, we restart
589 * the timer if the login is not successful.
590 */
591 spin_lock_bh(&sess->conn_lock);
592 if (sess->session_state == TARG_SESS_STATE_FAILED)
593 atomic_set(&sess->session_continuation, 1);
594 spin_unlock_bh(&sess->conn_lock);
595
596 iscsi_login_set_conn_values(sess, conn, pdu->cid);
597
598 if (iscsi_copy_param_list(&conn->param_list,
60bfcf8e 599 conn->tpg->param_list, 0) < 0) {
e48354ce
NB		 600 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
601 ISCSI_LOGIN_STATUS_NO_RESOURCES);
602 return -1;
603 }
604
03aa2070
NB		 605 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
606 iser = true;
607
608 iscsi_set_keys_to_negotiate(conn->param_list, iser);
e48354ce
NB		 609 /*
610 * Need to send TargetPortalGroupTag back in first login response
611 * on any iSCSI connection where the Initiator provides TargetName.
612 * See 5.3.1. Login Phase Start
613 *
614 * In our case, we have already located the struct iscsi_tiqn at this point.
615 */
79d59d08 616 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
e48354ce 617 return -1;
e48354ce
NB		 618
619 return iscsi_login_disable_FIM_keys(conn->param_list, conn);
620}
621
622int iscsi_login_post_auth_non_zero_tsih(
623 struct iscsi_conn *conn,
624 u16 cid,
625 u32 exp_statsn)
626{
627 struct iscsi_conn *conn_ptr = NULL;
628 struct iscsi_conn_recovery *cr = NULL;
629 struct iscsi_session *sess = conn->sess;
630
631 /*
632 * By following item 5 in the login table, if we have found
633 * an existing ISID and a valid/existing TSIH and an existing
634 * CID we do connection reinstatement. Currently we dont not
635 * support it so we send back an non-zero status class to the
636 * initiator and release the new connection.
637 */
638 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
ee1b1b9c 639 if (conn_ptr) {
e48354ce
NB		 640 pr_err("Connection exists with CID %hu for %s,"
641 " performing connection reinstatement.\n",
642 conn_ptr->cid, sess->sess_ops->InitiatorName);
643
644 iscsit_connection_reinstatement_rcfr(conn_ptr);
645 iscsit_dec_conn_usage_count(conn_ptr);
646 }
647
648 /*
649 * Check for any connection recovery entires containing CID.
650 * We use the original ExpStatSN sent in the first login request
651 * to acknowledge commands for the failed connection.
652 *
653 * Also note that an explict logout may have already been sent,
654 * but the response may not be sent due to additional connection
655 * loss.
656 */
657 if (sess->sess_ops->ErrorRecoveryLevel == 2) {
658 cr = iscsit_get_inactive_connection_recovery_entry(
659 sess, cid);
ee1b1b9c 660 if (cr) {
e48354ce
NB		 661 pr_debug("Performing implicit logout"
662 " for connection recovery on CID: %hu\n",
663 conn->cid);
664 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
665 }
666 }
667
668 /*
669 * Else we follow item 4 from the login table in that we have
670 * found an existing ISID and a valid/existing TSIH and a new
671 * CID we go ahead and continue to add a new connection to the
672 * session.
673 */
674 pr_debug("Adding CID %hu to existing session for %s.\n",
675 cid, sess->sess_ops->InitiatorName);
676
677 if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
678 pr_err("Adding additional connection to this session"
679 " would exceed MaxConnections %d, login failed.\n",
680 sess->sess_ops->MaxConnections);
681 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
682 ISCSI_LOGIN_STATUS_ISID_ERROR);
683 return -1;
684 }
685
686 return 0;
687}
688
689static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
690{
691 struct iscsi_session *sess = conn->sess;
03aa2070
NB		 692 /*
693 * FIXME: Unsolicitied NopIN support for ISER
694 */
695 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
696 return;
e48354ce
NB		 697
698 if (!sess->sess_ops->SessionType)
699 iscsit_start_nopin_timer(conn);
700}
701
96494916 702static int iscsit_start_kthreads(struct iscsi_conn *conn)
88dcd2da
NB		 703{
704 int ret = 0;
705
706 spin_lock(&iscsit_global->ts_bitmap_lock);
707 conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
708 ISCSIT_BITMAP_BITS, get_order(1));
709 spin_unlock(&iscsit_global->ts_bitmap_lock);
710
711 if (conn->bitmap_id < 0) {
712 pr_err("bitmap_find_free_region() failed for"
713 " iscsit_start_kthreads()\n");
714 return -ENOMEM;
715 }
716
717 conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
718 "%s", ISCSI_TX_THREAD_NAME);
719 if (IS_ERR(conn->tx_thread)) {
720 pr_err("Unable to start iscsi_target_tx_thread\n");
721 ret = PTR_ERR(conn->tx_thread);
722 goto out_bitmap;
723 }
724 conn->tx_thread_active = true;
725
726 conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
727 "%s", ISCSI_RX_THREAD_NAME);
728 if (IS_ERR(conn->rx_thread)) {
729 pr_err("Unable to start iscsi_target_rx_thread\n");
730 ret = PTR_ERR(conn->rx_thread);
731 goto out_tx;
732 }
733 conn->rx_thread_active = true;
734
735 return 0;
736out_tx:
737 kthread_stop(conn->tx_thread);
738 conn->tx_thread_active = false;
739out_bitmap:
740 spin_lock(&iscsit_global->ts_bitmap_lock);
741 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
742 get_order(1));
743 spin_unlock(&iscsit_global->ts_bitmap_lock);
744 return ret;
745}
746
a91eb7d9 747int iscsi_post_login_handler(
e48354ce
NB		 748 struct iscsi_np *np,
749 struct iscsi_conn *conn,
750 u8 zero_tsih)
751{
752 int stop_timer = 0;
753 struct iscsi_session *sess = conn->sess;
754 struct se_session *se_sess = sess->se_sess;
60bfcf8e 755 struct iscsi_portal_group *tpg = sess->tpg;
e48354ce 756 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
88dcd2da 757 int rc;
e48354ce
NB		 758
759 iscsit_inc_conn_usage_count(conn);
760
761 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
762 ISCSI_LOGIN_STATUS_ACCEPT);
763
764 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
765 conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
766
767 iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
768 iscsit_set_sync_and_steering_values(conn);
769 /*
770 * SCSI Initiator -> SCSI Target Port Mapping
771 */
e48354ce
NB		 772 if (!zero_tsih) {
773 iscsi_set_session_parameters(sess->sess_ops,
774 conn->param_list, 0);
775 iscsi_release_param_list(conn->param_list);
776 conn->param_list = NULL;
777
778 spin_lock_bh(&sess->conn_lock);
779 atomic_set(&sess->session_continuation, 0);
780 if (sess->session_state == TARG_SESS_STATE_FAILED) {
781 pr_debug("Moving to"
782 " TARG_SESS_STATE_LOGGED_IN.\n");
783 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
784 stop_timer = 1;
785 }
786
787 pr_debug("iSCSI Login successful on CID: %hu from %s to"
2f9bc894
NB		 788 " %s:%hu,%hu\n", conn->cid, conn->login_ip,
789 conn->local_ip, conn->local_port, tpg->tpgt);
e48354ce
NB		 790
791 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
792 atomic_inc(&sess->nconn);
793 pr_debug("Incremented iSCSI Connection count to %hu"
794 " from node: %s\n", atomic_read(&sess->nconn),
795 sess->sess_ops->InitiatorName);
796 spin_unlock_bh(&sess->conn_lock);
797
88dcd2da
NB		 798 rc = iscsit_start_kthreads(conn);
799 if (rc)
800 return rc;
baa4d64b 801
88dcd2da 802 iscsi_post_login_start_timers(conn);
e48354ce
NB		 803 /*
804 * Determine CPU mask to ensure connection's RX and TX kthreads
805 * are scheduled on the same CPU.
806 */
807 iscsit_thread_get_cpumask(conn);
808 conn->conn_rx_reset_cpumask = 1;
809 conn->conn_tx_reset_cpumask = 1;
810
811 iscsit_dec_conn_usage_count(conn);
812 if (stop_timer) {
813 spin_lock_bh(&se_tpg->session_lock);
814 iscsit_stop_time2retain_timer(sess);
815 spin_unlock_bh(&se_tpg->session_lock);
816 }
817 iscsit_dec_session_usage_count(sess);
818 return 0;
819 }
820
821 iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
822 iscsi_release_param_list(conn->param_list);
823 conn->param_list = NULL;
824
825 iscsit_determine_maxcmdsn(sess);
826
827 spin_lock_bh(&se_tpg->session_lock);
828 __transport_register_session(&sess->tpg->tpg_se_tpg,
8359cf43 829 se_sess->se_node_acl, se_sess, sess);
e48354ce
NB		 830 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
831 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
832
833 pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
2f9bc894
NB		 834 conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
835 tpg->tpgt);
e48354ce
NB		 836
837 spin_lock_bh(&sess->conn_lock);
838 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
839 atomic_inc(&sess->nconn);
840 pr_debug("Incremented iSCSI Connection count to %hu from node:"
841 " %s\n", atomic_read(&sess->nconn),
842 sess->sess_ops->InitiatorName);
843 spin_unlock_bh(&sess->conn_lock);
844
845 sess->sid = tpg->sid++;
846 if (!sess->sid)
847 sess->sid = tpg->sid++;
848 pr_debug("Established iSCSI session from node: %s\n",
849 sess->sess_ops->InitiatorName);
850
851 tpg->nsessions++;
852 if (tpg->tpg_tiqn)
853 tpg->tpg_tiqn->tiqn_nsessions++;
854
855 pr_debug("Incremented number of active iSCSI sessions to %u on"
856 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
857 spin_unlock_bh(&se_tpg->session_lock);
858
88dcd2da
NB		 859 rc = iscsit_start_kthreads(conn);
860 if (rc)
861 return rc;
862
e48354ce 863 iscsi_post_login_start_timers(conn);
e48354ce
NB		 864 /*
865 * Determine CPU mask to ensure connection's RX and TX kthreads
866 * are scheduled on the same CPU.
867 */
868 iscsit_thread_get_cpumask(conn);
869 conn->conn_rx_reset_cpumask = 1;
870 conn->conn_tx_reset_cpumask = 1;
871
872 iscsit_dec_conn_usage_count(conn);
873
874 return 0;
875}
876
877static void iscsi_handle_login_thread_timeout(unsigned long data)
878{
879 struct iscsi_np *np = (struct iscsi_np *) data;
880
881 spin_lock_bh(&np->np_thread_lock);
882 pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
883 np->np_ip, np->np_port);
884
885 if (np->np_login_timer_flags & ISCSI_TF_STOP) {
886 spin_unlock_bh(&np->np_thread_lock);
887 return;
888 }
889
890 if (np->np_thread)
891 send_sig(SIGINT, np->np_thread, 1);
892
893 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
894 spin_unlock_bh(&np->np_thread_lock);
895}
896
897static void iscsi_start_login_thread_timer(struct iscsi_np *np)
898{
899 /*
900 * This used the TA_LOGIN_TIMEOUT constant because at this
901 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
902 */
903 spin_lock_bh(&np->np_thread_lock);
904 init_timer(&np->np_login_timer);
905 np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
906 np->np_login_timer.data = (unsigned long)np;
907 np->np_login_timer.function = iscsi_handle_login_thread_timeout;
908 np->np_login_timer_flags &= ~ISCSI_TF_STOP;
909 np->np_login_timer_flags |= ISCSI_TF_RUNNING;
910 add_timer(&np->np_login_timer);
911
912 pr_debug("Added timeout timer to iSCSI login request for"
913 " %u seconds.\n", TA_LOGIN_TIMEOUT);
914 spin_unlock_bh(&np->np_thread_lock);
915}
916
917static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
918{
919 spin_lock_bh(&np->np_thread_lock);
920 if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
921 spin_unlock_bh(&np->np_thread_lock);
922 return;
923 }
924 np->np_login_timer_flags |= ISCSI_TF_STOP;
925 spin_unlock_bh(&np->np_thread_lock);
926
927 del_timer_sync(&np->np_login_timer);
928
929 spin_lock_bh(&np->np_thread_lock);
930 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
931 spin_unlock_bh(&np->np_thread_lock);
932}
933
baa4d64b 934int iscsit_setup_np(
e48354ce
NB		 935 struct iscsi_np *np,
936 struct __kernel_sockaddr_storage *sockaddr)
937{
baa4d64b 938 struct socket *sock = NULL;
837f6452 939 int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
e48354ce
NB		 940
941 switch (np->np_network_transport) {
942 case ISCSI_TCP:
943 np->np_ip_proto = IPPROTO_TCP;
944 np->np_sock_type = SOCK_STREAM;
945 break;
946 case ISCSI_SCTP_TCP:
947 np->np_ip_proto = IPPROTO_SCTP;
948 np->np_sock_type = SOCK_STREAM;
949 break;
950 case ISCSI_SCTP_UDP:
951 np->np_ip_proto = IPPROTO_SCTP;
952 np->np_sock_type = SOCK_SEQPACKET;
953 break;
e48354ce
NB		 954 default:
955 pr_err("Unsupported network_transport: %d\n",
956 np->np_network_transport);
957 return -EINVAL;
958 }
959
baa4d64b
NB		 960 np->np_ip_proto = IPPROTO_TCP;
961 np->np_sock_type = SOCK_STREAM;
962
e48354ce
NB		 963 ret = sock_create(sockaddr->ss_family, np->np_sock_type,
964 np->np_ip_proto, &sock);
965 if (ret < 0) {
966 pr_err("sock_create() failed.\n");
967 return ret;
968 }
969 np->np_socket = sock;
e48354ce
NB		 970 /*
971 * Setup the np->np_sockaddr from the passed sockaddr setup
972 * in iscsi_target_configfs.c code..
973 */
8359cf43 974 memcpy(&np->np_sockaddr, sockaddr,
e48354ce
NB		 975 sizeof(struct __kernel_sockaddr_storage));
976
977 if (sockaddr->ss_family == AF_INET6)
978 len = sizeof(struct sockaddr_in6);
979 else
980 len = sizeof(struct sockaddr_in);
981 /*
982 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
983 */
8359cf43 984 /* FIXME: Someone please explain why this is endian-safe */
e48354ce
NB		 985 opt = 1;
986 if (np->np_network_transport == ISCSI_TCP) {
987 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
988 (char *)&opt, sizeof(opt));
989 if (ret < 0) {
990 pr_err("kernel_setsockopt() for TCP_NODELAY"
991 " failed: %d\n", ret);
992 goto fail;
993 }
994 }
995
8359cf43 996 /* FIXME: Someone please explain why this is endian-safe */
e48354ce
NB		 997 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
998 (char *)&opt, sizeof(opt));
999 if (ret < 0) {
1000 pr_err("kernel_setsockopt() for SO_REUSEADDR"
1001 " failed\n");
1002 goto fail;
1003 }
1004
9f9ef6d3
DK		 1005 ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
1006 (char *)&opt, sizeof(opt));
1007 if (ret < 0) {
1008 pr_err("kernel_setsockopt() for IP_FREEBIND"
1009 " failed\n");
1010 goto fail;
1011 }
1012
e48354ce
NB		 1013 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
1014 if (ret < 0) {
1015 pr_err("kernel_bind() failed: %d\n", ret);
1016 goto fail;
1017 }
1018
1019 ret = kernel_listen(sock, backlog);
1020 if (ret != 0) {
1021 pr_err("kernel_listen() failed: %d\n", ret);
1022 goto fail;
1023 }
1024
1025 return 0;
e48354ce
NB		 1026fail:
1027 np->np_socket = NULL;
94e16e9c 1028 sock_release(sock);
e48354ce
NB		 1029 return ret;
1030}
1031
baa4d64b
NB		 1032int iscsi_target_setup_login_socket(
1033 struct iscsi_np *np,
1034 struct __kernel_sockaddr_storage *sockaddr)
1035{
1036 struct iscsit_transport *t;
1037 int rc;
1038
1039 t = iscsit_get_transport(np->np_network_transport);
1040 if (!t)
1041 return -EINVAL;
1042
1043 rc = t->iscsit_setup_np(np, sockaddr);
1044 if (rc < 0) {
1045 iscsit_put_transport(t);
1046 return rc;
1047 }
1048
1049 np->np_transport = t;
14f4b54f 1050 np->enabled = true;
baa4d64b
NB		 1051 return 0;
1052}
1053
1054int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1055{
1056 struct socket *new_sock, *sock = np->np_socket;
1057 struct sockaddr_in sock_in;
1058 struct sockaddr_in6 sock_in6;
1059 int rc, err;
1060
1061 rc = kernel_accept(sock, &new_sock, 0);
1062 if (rc < 0)
1063 return rc;
1064
1065 conn->sock = new_sock;
1066 conn->login_family = np->np_sockaddr.ss_family;
baa4d64b
NB		 1067
1068 if (np->np_sockaddr.ss_family == AF_INET6) {
1069 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1070
1071 rc = conn->sock->ops->getname(conn->sock,
1072 (struct sockaddr *)&sock_in6, &err, 1);
1073 if (!rc) {
dfecf611
CL		 1074 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1075 snprintf(conn->login_ip, sizeof(conn->login_ip), "[%pI6c]",
1076 &sock_in6.sin6_addr.in6_u);
1077 else
1078 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI4",
1079 &sock_in6.sin6_addr.s6_addr32[3]);
baa4d64b
NB		 1080 conn->login_port = ntohs(sock_in6.sin6_port);
1081 }
1082
1083 rc = conn->sock->ops->getname(conn->sock,
1084 (struct sockaddr *)&sock_in6, &err, 0);
1085 if (!rc) {
dfecf611
CL		 1086 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1087 snprintf(conn->local_ip, sizeof(conn->local_ip), "[%pI6c]",
1088 &sock_in6.sin6_addr.in6_u);
1089 else
1090 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI4",
1091 &sock_in6.sin6_addr.s6_addr32[3]);
baa4d64b
NB		 1092 conn->local_port = ntohs(sock_in6.sin6_port);
1093 }
1094 } else {
1095 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1096
1097 rc = conn->sock->ops->getname(conn->sock,
1098 (struct sockaddr *)&sock_in, &err, 1);
1099 if (!rc) {
1100 sprintf(conn->login_ip, "%pI4",
1101 &sock_in.sin_addr.s_addr);
1102 conn->login_port = ntohs(sock_in.sin_port);
1103 }
1104
1105 rc = conn->sock->ops->getname(conn->sock,
1106 (struct sockaddr *)&sock_in, &err, 0);
1107 if (!rc) {
1108 sprintf(conn->local_ip, "%pI4",
1109 &sock_in.sin_addr.s_addr);
1110 conn->local_port = ntohs(sock_in.sin_port);
1111 }
1112 }
1113
1114 return 0;
1115}
1116
1117int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1118{
1119 struct iscsi_login_req *login_req;
1120 u32 padding = 0, payload_length;
1121
1122 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1123 return -1;
1124
1125 login_req = (struct iscsi_login_req *)login->req;
1126 payload_length = ntoh24(login_req->dlength);
1127 padding = ((-payload_length) & 3);
1128
1129 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1130 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1131 login_req->flags, login_req->itt, login_req->cmdsn,
1132 login_req->exp_statsn, login_req->cid, payload_length);
1133 /*
1134 * Setup the initial iscsi_login values from the leading
1135 * login request PDU.
1136 */
1137 if (login->first_request) {
1138 login_req = (struct iscsi_login_req *)login->req;
1139 login->leading_connection = (!login_req->tsih) ? 1 : 0;
3e1c81a9 1140 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
baa4d64b
NB		 1141 login->version_min = login_req->min_version;
1142 login->version_max = login_req->max_version;
1143 memcpy(login->isid, login_req->isid, 6);
1144 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1145 login->init_task_tag = login_req->itt;
1146 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1147 login->cid = be16_to_cpu(login_req->cid);
1148 login->tsih = be16_to_cpu(login_req->tsih);
1149 }
1150
1151 if (iscsi_target_check_login_request(conn, login) < 0)
1152 return -1;
1153
1154 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1155 if (iscsi_login_rx_data(conn, login->req_buf,
1156 payload_length + padding) < 0)
1157 return -1;
1158
1159 return 0;
1160}
1161
1162int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1163 u32 length)
1164{
1165 if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1166 return -1;
1167
1168 return 0;
1169}
1170
1171static int
1172iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1173{
1174 int rc;
1175
1176 if (!t->owner) {
1177 conn->conn_transport = t;
1178 return 0;
1179 }
1180
1181 rc = try_module_get(t->owner);
1182 if (!rc) {
1183 pr_err("try_module_get() failed for %s\n", t->name);
1184 return -EINVAL;
1185 }
1186
1187 conn->conn_transport = t;
1188 return 0;
1189}
1190
a91eb7d9
NB		 1191void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1192 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1193{
0bcc297e 1194 if (!new_sess)
a91eb7d9
NB		 1195 goto old_sess_out;
1196
1197 pr_err("iSCSI Login negotiation failed.\n");
1198 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1199 ISCSI_LOGIN_STATUS_INIT_ERR);
1200 if (!zero_tsih || !conn->sess)
1201 goto old_sess_out;
1202 if (conn->sess->se_sess)
1203 transport_free_session(conn->sess->se_sess);
1204 if (conn->sess->session_index != 0) {
1205 spin_lock_bh(&sess_idr_lock);
1206 idr_remove(&sess_idr, conn->sess->session_index);
1207 spin_unlock_bh(&sess_idr_lock);
1208 }
1209 kfree(conn->sess->sess_ops);
1210 kfree(conn->sess);
a0b3b9b2 1211 conn->sess = NULL;
a91eb7d9
NB		 1212
1213old_sess_out:
1214 iscsi_stop_login_thread_timer(np);
1215 /*
1216 * If login negotiation fails check if the Time2Retain timer
1217 * needs to be restarted.
1218 */
1219 if (!zero_tsih && conn->sess) {
1220 spin_lock_bh(&conn->sess->conn_lock);
1221 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1222 struct se_portal_group *se_tpg =
60bfcf8e 1223 &conn->tpg->tpg_se_tpg;
a91eb7d9
NB		 1224
1225 atomic_set(&conn->sess->session_continuation, 0);
1226 spin_unlock_bh(&conn->sess->conn_lock);
1227 spin_lock_bh(&se_tpg->session_lock);
1228 iscsit_start_time2retain_handler(conn->sess);
1229 spin_unlock_bh(&se_tpg->session_lock);
1230 } else
1231 spin_unlock_bh(&conn->sess->conn_lock);
1232 iscsit_dec_session_usage_count(conn->sess);
1233 }
1234
1235 if (!IS_ERR(conn->conn_rx_hash.tfm))
1236 crypto_free_hash(conn->conn_rx_hash.tfm);
1237 if (!IS_ERR(conn->conn_tx_hash.tfm))
1238 crypto_free_hash(conn->conn_tx_hash.tfm);
1239
fbecb659 1240 free_cpumask_var(conn->conn_cpumask);
a91eb7d9
NB		 1241
1242 kfree(conn->conn_ops);
1243
1244 if (conn->param_list) {
1245 iscsi_release_param_list(conn->param_list);
1246 conn->param_list = NULL;
1247 }
1248 iscsi_target_nego_release(conn);
1249
1250 if (conn->sock) {
1251 sock_release(conn->sock);
1252 conn->sock = NULL;
1253 }
1254
954f2372
SG		 1255 if (conn->conn_transport->iscsit_wait_conn)
1256 conn->conn_transport->iscsit_wait_conn(conn);
1257
a91eb7d9
NB		 1258 if (conn->conn_transport->iscsit_free_conn)
1259 conn->conn_transport->iscsit_free_conn(conn);
1260
1261 iscsit_put_transport(conn->conn_transport);
1262 kfree(conn);
1263}
1264
e48354ce
NB		 1265static int __iscsi_target_login_thread(struct iscsi_np *np)
1266{
baa4d64b 1267 u8 *buffer, zero_tsih = 0;
81a9c5e7 1268 int ret = 0, rc;
e48354ce
NB		 1269 struct iscsi_conn *conn = NULL;
1270 struct iscsi_login *login;
1271 struct iscsi_portal_group *tpg = NULL;
e48354ce 1272 struct iscsi_login_req *pdu;
a91eb7d9
NB		 1273 struct iscsi_tpg_np *tpg_np;
1274 bool new_sess = false;
e48354ce
NB		 1275
1276 flush_signals(current);
e48354ce
NB		 1277
1278 spin_lock_bh(&np->np_thread_lock);
1279 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1280 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1281 complete(&np->np_restart_comp);
81a9c5e7
MP		 1282 } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1283 spin_unlock_bh(&np->np_thread_lock);
1284 goto exit;
e48354ce
NB		 1285 } else {
1286 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1287 }
1288 spin_unlock_bh(&np->np_thread_lock);
1289
e48354ce
NB		 1290 conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1291 if (!conn) {
1292 pr_err("Could not allocate memory for"
1293 " new connection\n");
e48354ce
NB		 1294 /* Get another socket */
1295 return 1;
1296 }
e48354ce
NB		 1297 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1298 conn->conn_state = TARG_CONN_STATE_FREE;
e48354ce 1299
baa4d64b
NB		 1300 if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1301 kfree(conn);
1302 return 1;
1303 }
e48354ce 1304
baa4d64b
NB		 1305 rc = np->np_transport->iscsit_accept_np(np, conn);
1306 if (rc == -ENOSYS) {
1307 complete(&np->np_restart_comp);
1308 iscsit_put_transport(conn->conn_transport);
1309 kfree(conn);
1310 conn = NULL;
1311 goto exit;
1312 } else if (rc < 0) {
1313 spin_lock_bh(&np->np_thread_lock);
1314 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1315 spin_unlock_bh(&np->np_thread_lock);
1316 complete(&np->np_restart_comp);
c9a03c12
NB		 1317 iscsit_put_transport(conn->conn_transport);
1318 kfree(conn);
1319 conn = NULL;
baa4d64b
NB		 1320 /* Get another socket */
1321 return 1;
1322 }
1323 spin_unlock_bh(&np->np_thread_lock);
1324 iscsit_put_transport(conn->conn_transport);
1325 kfree(conn);
1326 conn = NULL;
1327 goto out;
e48354ce
NB		 1328 }
1329 /*
1330 * Perform the remaining iSCSI connection initialization items..
1331 */
baa4d64b
NB		 1332 login = iscsi_login_init_conn(conn);
1333 if (!login) {
e48354ce
NB		 1334 goto new_sess_out;
1335 }
1336
baa4d64b 1337 iscsi_start_login_thread_timer(np);
e48354ce 1338
baa4d64b
NB		 1339 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1340 conn->conn_state = TARG_CONN_STATE_XPT_UP;
1341 /*
1342 * This will process the first login request + payload..
1343 */
1344 rc = np->np_transport->iscsit_get_login_rx(conn, login);
1345 if (rc == 1)
1346 return 1;
1347 else if (rc < 0)
1348 goto new_sess_out;
66c7db68 1349
baa4d64b
NB		 1350 buffer = &login->req[0];
1351 pdu = (struct iscsi_login_req *)buffer;
e48354ce
NB		 1352 /*
1353 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1354 * when Status-Class != 0.
1355 */
baa4d64b 1356 conn->login_itt = pdu->itt;
e48354ce
NB		 1357
1358 spin_lock_bh(&np->np_thread_lock);
1359 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1360 spin_unlock_bh(&np->np_thread_lock);
1361 pr_err("iSCSI Network Portal on %s:%hu currently not"
1362 " active.\n", np->np_ip, np->np_port);
1363 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1364 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1365 goto new_sess_out;
1366 }
1367 spin_unlock_bh(&np->np_thread_lock);
1368
e48354ce
NB		 1369 conn->network_transport = np->np_network_transport;
1370
1371 pr_debug("Received iSCSI login request from %s on %s Network"
baa4d64b
NB		 1372 " Portal %s:%hu\n", conn->login_ip, np->np_transport->name,
1373 conn->local_ip, conn->local_port);
e48354ce
NB		 1374
1375 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1376 conn->conn_state = TARG_CONN_STATE_IN_LOGIN;
1377
1378 if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1379 pdu->min_version) < 0)
1380 goto new_sess_out;
1381
1382 zero_tsih = (pdu->tsih == 0x0000);
ee1b1b9c 1383 if (zero_tsih) {
e48354ce
NB		 1384 /*
1385 * This is the leading connection of a new session.
1386 * We wait until after authentication to check for
1387 * session reinstatement.
1388 */
1389 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1390 goto new_sess_out;
1391 } else {
1392 /*
1393 * Add a new connection to an existing session.
1394 * We check for a non-existant session in
1395 * iscsi_login_non_zero_tsih_s2() below based
1396 * on ISID/TSIH, but wait until after authentication
1397 * to check for connection reinstatement, etc.
1398 */
1399 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1400 goto new_sess_out;
1401 }
e48354ce 1402 /*
baa4d64b
NB		 1403 * SessionType: Discovery
1404 *
1405 * Locates Default Portal
1406 *
1407 * SessionType: Normal
1408 *
1409 * Locates Target Portal from NP -> Target IQN
e48354ce 1410 */
baa4d64b
NB		 1411 rc = iscsi_target_locate_portal(np, conn, login);
1412 if (rc < 0) {
e48354ce
NB		 1413 tpg = conn->tpg;
1414 goto new_sess_out;
1415 }
a91eb7d9 1416 login->zero_tsih = zero_tsih;
e48354ce 1417
23a548ee
SG		 1418 conn->sess->se_sess->sup_prot_ops =
1419 conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1420
e48354ce
NB		 1421 tpg = conn->tpg;
1422 if (!tpg) {
1423 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1424 goto new_sess_out;
1425 }
1426
1427 if (zero_tsih) {
baa4d64b 1428 if (iscsi_login_zero_tsih_s2(conn) < 0)
e48354ce 1429 goto new_sess_out;
e48354ce 1430 } else {
baa4d64b 1431 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
e48354ce 1432 goto old_sess_out;
e48354ce
NB		 1433 }
1434
a91eb7d9
NB		 1435 ret = iscsi_target_start_negotiation(login, conn);
1436 if (ret < 0)
e48354ce
NB		 1437 goto new_sess_out;
1438
1439 if (!conn->sess) {
1440 pr_err("struct iscsi_conn session pointer is NULL!\n");
1441 goto new_sess_out;
1442 }
1443
1444 iscsi_stop_login_thread_timer(np);
1445
1446 if (signal_pending(current))
1447 goto new_sess_out;
1448
a91eb7d9
NB		 1449 if (ret == 1) {
1450 tpg_np = conn->tpg_np;
e48354ce 1451
a91eb7d9
NB		 1452 ret = iscsi_post_login_handler(np, conn, zero_tsih);
1453 if (ret < 0)
1454 goto new_sess_out;
1455
1456 iscsit_deaccess_np(np, tpg, tpg_np);
1457 }
e48354ce 1458
e48354ce 1459 tpg = NULL;
a91eb7d9 1460 tpg_np = NULL;
e48354ce
NB		 1461 /* Get another socket */
1462 return 1;
1463
1464new_sess_out:
a91eb7d9 1465 new_sess = true;
e48354ce 1466old_sess_out:
a91eb7d9
NB		 1467 tpg_np = conn->tpg_np;
1468 iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1469 new_sess = false;
e48354ce
NB		 1470
1471 if (tpg) {
a91eb7d9 1472 iscsit_deaccess_np(np, tpg, tpg_np);
e48354ce 1473 tpg = NULL;
a91eb7d9 1474 tpg_np = NULL;
e48354ce
NB		 1475 }
1476
1477out:
81a9c5e7
MP		 1478 return 1;
1479
baa4d64b 1480exit:
e48354ce
NB		 1481 iscsi_stop_login_thread_timer(np);
1482 spin_lock_bh(&np->np_thread_lock);
1483 np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1484 spin_unlock_bh(&np->np_thread_lock);
baa4d64b 1485
e48354ce
NB		 1486 return 0;
1487}
1488
1489int iscsi_target_login_thread(void *arg)
1490{
8359cf43 1491 struct iscsi_np *np = arg;
e48354ce
NB		 1492 int ret;
1493
1494 allow_signal(SIGINT);
1495
81a9c5e7 1496 while (1) {
e48354ce
NB		 1497 ret = __iscsi_target_login_thread(np);
1498 /*
1499 * We break and exit here unless another sock_accept() call
1500 * is expected.
1501 */
1502 if (ret != 1)
1503 break;
1504 }
1505
1506 return 0;
1507}
Linux 6.x block layer and io_uring tree(s)