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target/spc: Simplify INQUIRY EVPD=0x80
[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
NB		 26
27#include "iscsi_target_core.h"
28#include "iscsi_target_tq.h"
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"
34#include "iscsi_target_stat.h"
35#include "iscsi_target_tpg.h"
36#include "iscsi_target_util.h"
37#include "iscsi_target.h"
38#include "iscsi_target_parameters.h"
39
baa4d64b
NB		 40#include <target/iscsi/iscsi_transport.h>
41
42static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
e48354ce 43{
baa4d64b
NB		 44 struct iscsi_login *login;
45
46 login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
47 if (!login) {
48 pr_err("Unable to allocate memory for struct iscsi_login.\n");
49 return NULL;
50 }
a91eb7d9 51 conn->login = login;
baa4d64b
NB		 52 login->conn = conn;
53 login->first_request = 1;
54
55 login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
56 if (!login->req_buf) {
57 pr_err("Unable to allocate memory for response buffer.\n");
58 goto out_login;
59 }
60
61 login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
62 if (!login->rsp_buf) {
63 pr_err("Unable to allocate memory for request buffer.\n");
64 goto out_req_buf;
65 }
66
67 conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
68 if (!conn->conn_ops) {
69 pr_err("Unable to allocate memory for"
70 " struct iscsi_conn_ops.\n");
71 goto out_rsp_buf;
72 }
73
d5627acb 74 init_waitqueue_head(&conn->queues_wq);
e48354ce
NB		 75 INIT_LIST_HEAD(&conn->conn_list);
76 INIT_LIST_HEAD(&conn->conn_cmd_list);
77 INIT_LIST_HEAD(&conn->immed_queue_list);
78 INIT_LIST_HEAD(&conn->response_queue_list);
79 init_completion(&conn->conn_post_wait_comp);
80 init_completion(&conn->conn_wait_comp);
81 init_completion(&conn->conn_wait_rcfr_comp);
82 init_completion(&conn->conn_waiting_on_uc_comp);
83 init_completion(&conn->conn_logout_comp);
84 init_completion(&conn->rx_half_close_comp);
85 init_completion(&conn->tx_half_close_comp);
86 spin_lock_init(&conn->cmd_lock);
87 spin_lock_init(&conn->conn_usage_lock);
88 spin_lock_init(&conn->immed_queue_lock);
89 spin_lock_init(&conn->nopin_timer_lock);
90 spin_lock_init(&conn->response_queue_lock);
91 spin_lock_init(&conn->state_lock);
92
93 if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
94 pr_err("Unable to allocate conn->conn_cpumask\n");
baa4d64b 95 goto out_conn_ops;
e48354ce 96 }
baa4d64b 97 conn->conn_login = login;
e48354ce 98
baa4d64b
NB		 99 return login;
100
101out_conn_ops:
102 kfree(conn->conn_ops);
103out_rsp_buf:
104 kfree(login->rsp_buf);
105out_req_buf:
106 kfree(login->req_buf);
107out_login:
108 kfree(login);
109 return NULL;
e48354ce
NB		 110}
111
112/*
113 * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
114 * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
115 */
116int iscsi_login_setup_crypto(struct iscsi_conn *conn)
117{
118 /*
119 * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
120 * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
121 * to software 1x8 byte slicing from crc32c.ko
122 */
123 conn->conn_rx_hash.flags = 0;
124 conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
125 CRYPTO_ALG_ASYNC);
126 if (IS_ERR(conn->conn_rx_hash.tfm)) {
127 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
128 return -ENOMEM;
129 }
130
131 conn->conn_tx_hash.flags = 0;
132 conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
133 CRYPTO_ALG_ASYNC);
134 if (IS_ERR(conn->conn_tx_hash.tfm)) {
135 pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n");
136 crypto_free_hash(conn->conn_rx_hash.tfm);
137 return -ENOMEM;
138 }
139
140 return 0;
141}
142
143static int iscsi_login_check_initiator_version(
144 struct iscsi_conn *conn,
145 u8 version_max,
146 u8 version_min)
147{
148 if ((version_max != 0x00) || (version_min != 0x00)) {
149 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
150 " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
151 version_min, version_max);
152 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
153 ISCSI_LOGIN_STATUS_NO_VERSION);
154 return -1;
155 }
156
157 return 0;
158}
159
160int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
161{
162 int sessiontype;
163 struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
164 struct iscsi_portal_group *tpg = conn->tpg;
165 struct iscsi_session *sess = NULL, *sess_p = NULL;
166 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
167 struct se_session *se_sess, *se_sess_tmp;
168
169 initiatorname_param = iscsi_find_param_from_key(
170 INITIATORNAME, conn->param_list);
e48354ce
NB		 171 sessiontype_param = iscsi_find_param_from_key(
172 SESSIONTYPE, conn->param_list);
1c5c12c6
RD		 173 if (!initiatorname_param || !sessiontype_param) {
174 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
175 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
e48354ce 176 return -1;
1c5c12c6 177 }
e48354ce
NB		 178
179 sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
180
181 spin_lock_bh(&se_tpg->session_lock);
182 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
183 sess_list) {
184
8359cf43 185 sess_p = se_sess->fabric_sess_ptr;
e48354ce
NB		 186 spin_lock(&sess_p->conn_lock);
187 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
188 atomic_read(&sess_p->session_logout) ||
189 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
190 spin_unlock(&sess_p->conn_lock);
191 continue;
192 }
8359cf43
JE		 193 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
194 (!strcmp(sess_p->sess_ops->InitiatorName,
195 initiatorname_param->value) &&
e48354ce
NB		 196 (sess_p->sess_ops->SessionType == sessiontype))) {
197 atomic_set(&sess_p->session_reinstatement, 1);
198 spin_unlock(&sess_p->conn_lock);
199 iscsit_inc_session_usage_count(sess_p);
200 iscsit_stop_time2retain_timer(sess_p);
201 sess = sess_p;
202 break;
203 }
204 spin_unlock(&sess_p->conn_lock);
205 }
206 spin_unlock_bh(&se_tpg->session_lock);
207 /*
208 * If the Time2Retain handler has expired, the session is already gone.
209 */
210 if (!sess)
211 return 0;
212
213 pr_debug("%s iSCSI Session SID %u is still active for %s,"
214 " preforming session reinstatement.\n", (sessiontype) ?
215 "Discovery" : "Normal", sess->sid,
216 sess->sess_ops->InitiatorName);
217
218 spin_lock_bh(&sess->conn_lock);
219 if (sess->session_state == TARG_SESS_STATE_FAILED) {
220 spin_unlock_bh(&sess->conn_lock);
221 iscsit_dec_session_usage_count(sess);
99367f01
NB		 222 target_put_session(sess->se_sess);
223 return 0;
e48354ce
NB		 224 }
225 spin_unlock_bh(&sess->conn_lock);
226
227 iscsit_stop_session(sess, 1, 1);
228 iscsit_dec_session_usage_count(sess);
229
99367f01
NB		 230 target_put_session(sess->se_sess);
231 return 0;
e48354ce
NB		 232}
233
234static void iscsi_login_set_conn_values(
235 struct iscsi_session *sess,
236 struct iscsi_conn *conn,
50e5c87d 237 __be16 cid)
e48354ce
NB		 238{
239 conn->sess = sess;
50e5c87d 240 conn->cid = be16_to_cpu(cid);
e48354ce
NB		 241 /*
242 * Generate a random Status sequence number (statsn) for the new
243 * iSCSI connection.
244 */
245 get_random_bytes(&conn->stat_sn, sizeof(u32));
246
247 mutex_lock(&auth_id_lock);
248 conn->auth_id = iscsit_global->auth_id++;
249 mutex_unlock(&auth_id_lock);
250}
251
252/*
253 * This is the leading connection of a new session,
254 * or session reinstatement.
255 */
256static int iscsi_login_zero_tsih_s1(
257 struct iscsi_conn *conn,
258 unsigned char *buf)
259{
260 struct iscsi_session *sess = NULL;
261 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
e70beee7 262 enum target_prot_op sup_pro_ops;
13b5533a 263 int ret;
e48354ce
NB		 264
265 sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
266 if (!sess) {
267 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
268 ISCSI_LOGIN_STATUS_NO_RESOURCES);
269 pr_err("Could not allocate memory for session\n");
0957627a 270 return -ENOMEM;
e48354ce
NB		 271 }
272
273 iscsi_login_set_conn_values(sess, conn, pdu->cid);
274 sess->init_task_tag = pdu->itt;
8359cf43 275 memcpy(&sess->isid, pdu->isid, 6);
50e5c87d 276 sess->exp_cmd_sn = be32_to_cpu(pdu->cmdsn);
e48354ce
NB		 277 INIT_LIST_HEAD(&sess->sess_conn_list);
278 INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
279 INIT_LIST_HEAD(&sess->cr_active_list);
280 INIT_LIST_HEAD(&sess->cr_inactive_list);
281 init_completion(&sess->async_msg_comp);
282 init_completion(&sess->reinstatement_comp);
283 init_completion(&sess->session_wait_comp);
284 init_completion(&sess->session_waiting_on_uc_comp);
285 mutex_init(&sess->cmdsn_mutex);
286 spin_lock_init(&sess->conn_lock);
287 spin_lock_init(&sess->cr_a_lock);
288 spin_lock_init(&sess->cr_i_lock);
289 spin_lock_init(&sess->session_usage_lock);
290 spin_lock_init(&sess->ttt_lock);
291
c9365bd0 292 idr_preload(GFP_KERNEL);
998866b0 293 spin_lock_bh(&sess_idr_lock);
c9365bd0
TH		 294 ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
295 if (ret >= 0)
296 sess->session_index = ret;
998866b0 297 spin_unlock_bh(&sess_idr_lock);
c9365bd0 298 idr_preload_end();
e48354ce 299
13b5533a 300 if (ret < 0) {
c9365bd0 301 pr_err("idr_alloc() for sess_idr failed\n");
13b5533a
BW		 302 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
303 ISCSI_LOGIN_STATUS_NO_RESOURCES);
304 kfree(sess);
305 return -ENOMEM;
306 }
307
e48354ce 308 sess->creation_time = get_jiffies_64();
e48354ce
NB		 309 /*
310 * The FFP CmdSN window values will be allocated from the TPG's
311 * Initiator Node's ACL once the login has been successfully completed.
312 */
50e5c87d 313 sess->max_cmd_sn = be32_to_cpu(pdu->cmdsn);
e48354ce
NB		 314
315 sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
316 if (!sess->sess_ops) {
317 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
318 ISCSI_LOGIN_STATUS_NO_RESOURCES);
319 pr_err("Unable to allocate memory for"
320 " struct iscsi_sess_ops.\n");
0957627a
NB		 321 kfree(sess);
322 return -ENOMEM;
e48354ce 323 }
e70beee7 324 sup_pro_ops = conn->conn_transport->iscsit_get_sup_prot_ops(conn);
e48354ce 325
e70beee7 326 sess->se_sess = transport_init_session(sup_pro_ops);
0957627a 327 if (IS_ERR(sess->se_sess)) {
e48354ce
NB		 328 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
329 ISCSI_LOGIN_STATUS_NO_RESOURCES);
0957627a
NB		 330 kfree(sess);
331 return -ENOMEM;
e48354ce
NB		 332 }
333
334 return 0;
335}
336
337static int iscsi_login_zero_tsih_s2(
338 struct iscsi_conn *conn)
339{
340 struct iscsi_node_attrib *na;
341 struct iscsi_session *sess = conn->sess;
342 unsigned char buf[32];
03aa2070 343 bool iser = false;
e48354ce
NB		 344
345 sess->tpg = conn->tpg;
346
347 /*
348 * Assign a new TPG Session Handle. Note this is protected with
349 * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
350 */
60bfcf8e 351 sess->tsih = ++sess->tpg->ntsih;
e48354ce 352 if (!sess->tsih)
60bfcf8e 353 sess->tsih = ++sess->tpg->ntsih;
e48354ce
NB		 354
355 /*
356 * Create the default params from user defined values..
357 */
358 if (iscsi_copy_param_list(&conn->param_list,
60bfcf8e 359 conn->tpg->param_list, 1) < 0) {
e48354ce
NB		 360 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
361 ISCSI_LOGIN_STATUS_NO_RESOURCES);
362 return -1;
363 }
364
03aa2070
NB		 365 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
366 iser = true;
367
368 iscsi_set_keys_to_negotiate(conn->param_list, iser);
e48354ce
NB		 369
370 if (sess->sess_ops->SessionType)
371 return iscsi_set_keys_irrelevant_for_discovery(
372 conn->param_list);
373
374 na = iscsit_tpg_get_node_attrib(sess);
375
376 /*
377 * Need to send TargetPortalGroupTag back in first login response
378 * on any iSCSI connection where the Initiator provides TargetName.
379 * See 5.3.1. Login Phase Start
380 *
381 * In our case, we have already located the struct iscsi_tiqn at this point.
382 */
383 memset(buf, 0, 32);
60bfcf8e 384 sprintf(buf, "TargetPortalGroupTag=%hu", sess->tpg->tpgt);
e48354ce
NB		 385 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
386 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
387 ISCSI_LOGIN_STATUS_NO_RESOURCES);
388 return -1;
389 }
390
391 /*
392 * Workaround for Initiators that have broken connection recovery logic.
393 *
394 * "We would really like to get rid of this." Linux-iSCSI.org team
395 */
396 memset(buf, 0, 32);
397 sprintf(buf, "ErrorRecoveryLevel=%d", na->default_erl);
398 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
399 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
400 ISCSI_LOGIN_STATUS_NO_RESOURCES);
401 return -1;
402 }
403
404 if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
405 return -1;
03aa2070
NB		 406 /*
407 * Set RDMAExtensions=Yes by default for iSER enabled network portals
408 */
409 if (iser) {
410 struct iscsi_param *param;
411 unsigned long mrdsl, off;
412 int rc;
413
414 sprintf(buf, "RDMAExtensions=Yes");
415 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
416 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
417 ISCSI_LOGIN_STATUS_NO_RESOURCES);
418 return -1;
419 }
420 /*
421 * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
422 * Immediate Data + Unsolicitied Data-OUT if necessary..
423 */
424 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
425 conn->param_list);
426 if (!param) {
427 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
428 ISCSI_LOGIN_STATUS_NO_RESOURCES);
429 return -1;
430 }
57103d7f 431 rc = kstrtoul(param->value, 0, &mrdsl);
03aa2070
NB		 432 if (rc < 0) {
433 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
434 ISCSI_LOGIN_STATUS_NO_RESOURCES);
435 return -1;
436 }
437 off = mrdsl % PAGE_SIZE;
438 if (!off)
52d0aa79 439 goto check_prot;
03aa2070
NB		 440
441 if (mrdsl < PAGE_SIZE)
442 mrdsl = PAGE_SIZE;
443 else
444 mrdsl -= off;
445
446 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
447 " to PAGE_SIZE\n", mrdsl);
448
449 sprintf(buf, "MaxRecvDataSegmentLength=%lu\n", mrdsl);
450 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
451 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
452 ISCSI_LOGIN_STATUS_NO_RESOURCES);
453 return -1;
454 }
52d0aa79
NB		 455 /*
456 * ISER currently requires that ImmediateData + Unsolicited
457 * Data be disabled when protection / signature MRs are enabled.
458 */
459check_prot:
460 if (sess->se_sess->sup_prot_ops &
461 (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
462 TARGET_PROT_DOUT_INSERT)) {
463
464 sprintf(buf, "ImmediateData=No");
465 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
466 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
467 ISCSI_LOGIN_STATUS_NO_RESOURCES);
468 return -1;
469 }
470
471 sprintf(buf, "InitialR2T=Yes");
472 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
473 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
474 ISCSI_LOGIN_STATUS_NO_RESOURCES);
475 return -1;
476 }
477 pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
478 " T10-PI enabled ISER session\n");
479 }
03aa2070 480 }
e48354ce
NB		 481
482 return 0;
483}
484
485/*
486 * Remove PSTATE_NEGOTIATE for the four FIM related keys.
487 * The Initiator node will be able to enable FIM by proposing them itself.
488 */
489int iscsi_login_disable_FIM_keys(
490 struct iscsi_param_list *param_list,
491 struct iscsi_conn *conn)
492{
493 struct iscsi_param *param;
494
495 param = iscsi_find_param_from_key("OFMarker", param_list);
496 if (!param) {
497 pr_err("iscsi_find_param_from_key() for"
498 " OFMarker failed\n");
499 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
500 ISCSI_LOGIN_STATUS_NO_RESOURCES);
501 return -1;
502 }
503 param->state &= ~PSTATE_NEGOTIATE;
504
505 param = iscsi_find_param_from_key("OFMarkInt", param_list);
506 if (!param) {
507 pr_err("iscsi_find_param_from_key() for"
508 " IFMarker failed\n");
509 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
510 ISCSI_LOGIN_STATUS_NO_RESOURCES);
511 return -1;
512 }
513 param->state &= ~PSTATE_NEGOTIATE;
514
515 param = iscsi_find_param_from_key("IFMarker", param_list);
516 if (!param) {
517 pr_err("iscsi_find_param_from_key() for"
518 " IFMarker failed\n");
519 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
520 ISCSI_LOGIN_STATUS_NO_RESOURCES);
521 return -1;
522 }
523 param->state &= ~PSTATE_NEGOTIATE;
524
525 param = iscsi_find_param_from_key("IFMarkInt", param_list);
526 if (!param) {
527 pr_err("iscsi_find_param_from_key() for"
528 " IFMarker failed\n");
529 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
530 ISCSI_LOGIN_STATUS_NO_RESOURCES);
531 return -1;
532 }
533 param->state &= ~PSTATE_NEGOTIATE;
534
535 return 0;
536}
537
538static int iscsi_login_non_zero_tsih_s1(
539 struct iscsi_conn *conn,
540 unsigned char *buf)
541{
542 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
543
544 iscsi_login_set_conn_values(NULL, conn, pdu->cid);
545 return 0;
546}
547
548/*
549 * Add a new connection to an existing session.
550 */
551static int iscsi_login_non_zero_tsih_s2(
552 struct iscsi_conn *conn,
553 unsigned char *buf)
554{
555 struct iscsi_portal_group *tpg = conn->tpg;
556 struct iscsi_session *sess = NULL, *sess_p = NULL;
557 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
558 struct se_session *se_sess, *se_sess_tmp;
559 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
03aa2070 560 bool iser = false;
e48354ce
NB		 561
562 spin_lock_bh(&se_tpg->session_lock);
563 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
564 sess_list) {
565
566 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
567 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
568 atomic_read(&sess_p->session_logout) ||
569 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
570 continue;
8359cf43 571 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
50e5c87d 572 (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
e48354ce
NB		 573 iscsit_inc_session_usage_count(sess_p);
574 iscsit_stop_time2retain_timer(sess_p);
575 sess = sess_p;
576 break;
577 }
578 }
579 spin_unlock_bh(&se_tpg->session_lock);
580
581 /*
582 * If the Time2Retain handler has expired, the session is already gone.
583 */
584 if (!sess) {
585 pr_err("Initiator attempting to add a connection to"
586 " a non-existent session, rejecting iSCSI Login.\n");
587 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
588 ISCSI_LOGIN_STATUS_NO_SESSION);
589 return -1;
590 }
591
592 /*
593 * Stop the Time2Retain timer if this is a failed session, we restart
594 * the timer if the login is not successful.
595 */
596 spin_lock_bh(&sess->conn_lock);
597 if (sess->session_state == TARG_SESS_STATE_FAILED)
598 atomic_set(&sess->session_continuation, 1);
599 spin_unlock_bh(&sess->conn_lock);
600
601 iscsi_login_set_conn_values(sess, conn, pdu->cid);
602
603 if (iscsi_copy_param_list(&conn->param_list,
60bfcf8e 604 conn->tpg->param_list, 0) < 0) {
e48354ce
NB		 605 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
606 ISCSI_LOGIN_STATUS_NO_RESOURCES);
607 return -1;
608 }
609
03aa2070
NB		 610 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
611 iser = true;
612
613 iscsi_set_keys_to_negotiate(conn->param_list, iser);
e48354ce
NB		 614 /*
615 * Need to send TargetPortalGroupTag back in first login response
616 * on any iSCSI connection where the Initiator provides TargetName.
617 * See 5.3.1. Login Phase Start
618 *
619 * In our case, we have already located the struct iscsi_tiqn at this point.
620 */
621 memset(buf, 0, 32);
60bfcf8e 622 sprintf(buf, "TargetPortalGroupTag=%hu", sess->tpg->tpgt);
e48354ce
NB		 623 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
624 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
625 ISCSI_LOGIN_STATUS_NO_RESOURCES);
626 return -1;
627 }
628
629 return iscsi_login_disable_FIM_keys(conn->param_list, conn);
630}
631
632int iscsi_login_post_auth_non_zero_tsih(
633 struct iscsi_conn *conn,
634 u16 cid,
635 u32 exp_statsn)
636{
637 struct iscsi_conn *conn_ptr = NULL;
638 struct iscsi_conn_recovery *cr = NULL;
639 struct iscsi_session *sess = conn->sess;
640
641 /*
642 * By following item 5 in the login table, if we have found
643 * an existing ISID and a valid/existing TSIH and an existing
644 * CID we do connection reinstatement. Currently we dont not
645 * support it so we send back an non-zero status class to the
646 * initiator and release the new connection.
647 */
648 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
ee1b1b9c 649 if (conn_ptr) {
e48354ce
NB		 650 pr_err("Connection exists with CID %hu for %s,"
651 " performing connection reinstatement.\n",
652 conn_ptr->cid, sess->sess_ops->InitiatorName);
653
654 iscsit_connection_reinstatement_rcfr(conn_ptr);
655 iscsit_dec_conn_usage_count(conn_ptr);
656 }
657
658 /*
659 * Check for any connection recovery entires containing CID.
660 * We use the original ExpStatSN sent in the first login request
661 * to acknowledge commands for the failed connection.
662 *
663 * Also note that an explict logout may have already been sent,
664 * but the response may not be sent due to additional connection
665 * loss.
666 */
667 if (sess->sess_ops->ErrorRecoveryLevel == 2) {
668 cr = iscsit_get_inactive_connection_recovery_entry(
669 sess, cid);
ee1b1b9c 670 if (cr) {
e48354ce
NB		 671 pr_debug("Performing implicit logout"
672 " for connection recovery on CID: %hu\n",
673 conn->cid);
674 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
675 }
676 }
677
678 /*
679 * Else we follow item 4 from the login table in that we have
680 * found an existing ISID and a valid/existing TSIH and a new
681 * CID we go ahead and continue to add a new connection to the
682 * session.
683 */
684 pr_debug("Adding CID %hu to existing session for %s.\n",
685 cid, sess->sess_ops->InitiatorName);
686
687 if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
688 pr_err("Adding additional connection to this session"
689 " would exceed MaxConnections %d, login failed.\n",
690 sess->sess_ops->MaxConnections);
691 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
692 ISCSI_LOGIN_STATUS_ISID_ERROR);
693 return -1;
694 }
695
696 return 0;
697}
698
699static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
700{
701 struct iscsi_session *sess = conn->sess;
03aa2070
NB		 702 /*
703 * FIXME: Unsolicitied NopIN support for ISER
704 */
705 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
706 return;
e48354ce
NB		 707
708 if (!sess->sess_ops->SessionType)
709 iscsit_start_nopin_timer(conn);
710}
711
a91eb7d9 712int iscsi_post_login_handler(
e48354ce
NB		 713 struct iscsi_np *np,
714 struct iscsi_conn *conn,
715 u8 zero_tsih)
716{
717 int stop_timer = 0;
718 struct iscsi_session *sess = conn->sess;
719 struct se_session *se_sess = sess->se_sess;
60bfcf8e 720 struct iscsi_portal_group *tpg = sess->tpg;
e48354ce
NB		 721 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
722 struct iscsi_thread_set *ts;
723
724 iscsit_inc_conn_usage_count(conn);
725
726 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
727 ISCSI_LOGIN_STATUS_ACCEPT);
728
729 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
730 conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
731
732 iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
733 iscsit_set_sync_and_steering_values(conn);
734 /*
735 * SCSI Initiator -> SCSI Target Port Mapping
736 */
737 ts = iscsi_get_thread_set();
738 if (!zero_tsih) {
739 iscsi_set_session_parameters(sess->sess_ops,
740 conn->param_list, 0);
741 iscsi_release_param_list(conn->param_list);
742 conn->param_list = NULL;
743
744 spin_lock_bh(&sess->conn_lock);
745 atomic_set(&sess->session_continuation, 0);
746 if (sess->session_state == TARG_SESS_STATE_FAILED) {
747 pr_debug("Moving to"
748 " TARG_SESS_STATE_LOGGED_IN.\n");
749 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
750 stop_timer = 1;
751 }
752
753 pr_debug("iSCSI Login successful on CID: %hu from %s to"
2f9bc894
NB		 754 " %s:%hu,%hu\n", conn->cid, conn->login_ip,
755 conn->local_ip, conn->local_port, tpg->tpgt);
e48354ce
NB		 756
757 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
758 atomic_inc(&sess->nconn);
759 pr_debug("Incremented iSCSI Connection count to %hu"
760 " from node: %s\n", atomic_read(&sess->nconn),
761 sess->sess_ops->InitiatorName);
762 spin_unlock_bh(&sess->conn_lock);
763
764 iscsi_post_login_start_timers(conn);
baa4d64b 765
03aa2070 766 iscsi_activate_thread_set(conn, ts);
e48354ce
NB		 767 /*
768 * Determine CPU mask to ensure connection's RX and TX kthreads
769 * are scheduled on the same CPU.
770 */
771 iscsit_thread_get_cpumask(conn);
772 conn->conn_rx_reset_cpumask = 1;
773 conn->conn_tx_reset_cpumask = 1;
774
775 iscsit_dec_conn_usage_count(conn);
776 if (stop_timer) {
777 spin_lock_bh(&se_tpg->session_lock);
778 iscsit_stop_time2retain_timer(sess);
779 spin_unlock_bh(&se_tpg->session_lock);
780 }
781 iscsit_dec_session_usage_count(sess);
782 return 0;
783 }
784
785 iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
786 iscsi_release_param_list(conn->param_list);
787 conn->param_list = NULL;
788
789 iscsit_determine_maxcmdsn(sess);
790
791 spin_lock_bh(&se_tpg->session_lock);
792 __transport_register_session(&sess->tpg->tpg_se_tpg,
8359cf43 793 se_sess->se_node_acl, se_sess, sess);
e48354ce
NB		 794 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
795 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
796
797 pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
2f9bc894
NB		 798 conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
799 tpg->tpgt);
e48354ce
NB		 800
801 spin_lock_bh(&sess->conn_lock);
802 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
803 atomic_inc(&sess->nconn);
804 pr_debug("Incremented iSCSI Connection count to %hu from node:"
805 " %s\n", atomic_read(&sess->nconn),
806 sess->sess_ops->InitiatorName);
807 spin_unlock_bh(&sess->conn_lock);
808
809 sess->sid = tpg->sid++;
810 if (!sess->sid)
811 sess->sid = tpg->sid++;
812 pr_debug("Established iSCSI session from node: %s\n",
813 sess->sess_ops->InitiatorName);
814
815 tpg->nsessions++;
816 if (tpg->tpg_tiqn)
817 tpg->tpg_tiqn->tiqn_nsessions++;
818
819 pr_debug("Incremented number of active iSCSI sessions to %u on"
820 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
821 spin_unlock_bh(&se_tpg->session_lock);
822
823 iscsi_post_login_start_timers(conn);
824 iscsi_activate_thread_set(conn, ts);
825 /*
826 * Determine CPU mask to ensure connection's RX and TX kthreads
827 * are scheduled on the same CPU.
828 */
829 iscsit_thread_get_cpumask(conn);
830 conn->conn_rx_reset_cpumask = 1;
831 conn->conn_tx_reset_cpumask = 1;
832
833 iscsit_dec_conn_usage_count(conn);
834
835 return 0;
836}
837
838static void iscsi_handle_login_thread_timeout(unsigned long data)
839{
840 struct iscsi_np *np = (struct iscsi_np *) data;
841
842 spin_lock_bh(&np->np_thread_lock);
843 pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
844 np->np_ip, np->np_port);
845
846 if (np->np_login_timer_flags & ISCSI_TF_STOP) {
847 spin_unlock_bh(&np->np_thread_lock);
848 return;
849 }
850
851 if (np->np_thread)
852 send_sig(SIGINT, np->np_thread, 1);
853
854 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
855 spin_unlock_bh(&np->np_thread_lock);
856}
857
858static void iscsi_start_login_thread_timer(struct iscsi_np *np)
859{
860 /*
861 * This used the TA_LOGIN_TIMEOUT constant because at this
862 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
863 */
864 spin_lock_bh(&np->np_thread_lock);
865 init_timer(&np->np_login_timer);
866 np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
867 np->np_login_timer.data = (unsigned long)np;
868 np->np_login_timer.function = iscsi_handle_login_thread_timeout;
869 np->np_login_timer_flags &= ~ISCSI_TF_STOP;
870 np->np_login_timer_flags |= ISCSI_TF_RUNNING;
871 add_timer(&np->np_login_timer);
872
873 pr_debug("Added timeout timer to iSCSI login request for"
874 " %u seconds.\n", TA_LOGIN_TIMEOUT);
875 spin_unlock_bh(&np->np_thread_lock);
876}
877
878static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
879{
880 spin_lock_bh(&np->np_thread_lock);
881 if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
882 spin_unlock_bh(&np->np_thread_lock);
883 return;
884 }
885 np->np_login_timer_flags |= ISCSI_TF_STOP;
886 spin_unlock_bh(&np->np_thread_lock);
887
888 del_timer_sync(&np->np_login_timer);
889
890 spin_lock_bh(&np->np_thread_lock);
891 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
892 spin_unlock_bh(&np->np_thread_lock);
893}
894
baa4d64b 895int iscsit_setup_np(
e48354ce
NB		 896 struct iscsi_np *np,
897 struct __kernel_sockaddr_storage *sockaddr)
898{
baa4d64b 899 struct socket *sock = NULL;
837f6452 900 int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
e48354ce
NB		 901
902 switch (np->np_network_transport) {
903 case ISCSI_TCP:
904 np->np_ip_proto = IPPROTO_TCP;
905 np->np_sock_type = SOCK_STREAM;
906 break;
907 case ISCSI_SCTP_TCP:
908 np->np_ip_proto = IPPROTO_SCTP;
909 np->np_sock_type = SOCK_STREAM;
910 break;
911 case ISCSI_SCTP_UDP:
912 np->np_ip_proto = IPPROTO_SCTP;
913 np->np_sock_type = SOCK_SEQPACKET;
914 break;
e48354ce
NB		 915 default:
916 pr_err("Unsupported network_transport: %d\n",
917 np->np_network_transport);
918 return -EINVAL;
919 }
920
baa4d64b
NB		 921 np->np_ip_proto = IPPROTO_TCP;
922 np->np_sock_type = SOCK_STREAM;
923
e48354ce
NB		 924 ret = sock_create(sockaddr->ss_family, np->np_sock_type,
925 np->np_ip_proto, &sock);
926 if (ret < 0) {
927 pr_err("sock_create() failed.\n");
928 return ret;
929 }
930 np->np_socket = sock;
e48354ce
NB		 931 /*
932 * Setup the np->np_sockaddr from the passed sockaddr setup
933 * in iscsi_target_configfs.c code..
934 */
8359cf43 935 memcpy(&np->np_sockaddr, sockaddr,
e48354ce
NB		 936 sizeof(struct __kernel_sockaddr_storage));
937
938 if (sockaddr->ss_family == AF_INET6)
939 len = sizeof(struct sockaddr_in6);
940 else
941 len = sizeof(struct sockaddr_in);
942 /*
943 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
944 */
8359cf43 945 /* FIXME: Someone please explain why this is endian-safe */
e48354ce
NB		 946 opt = 1;
947 if (np->np_network_transport == ISCSI_TCP) {
948 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
949 (char *)&opt, sizeof(opt));
950 if (ret < 0) {
951 pr_err("kernel_setsockopt() for TCP_NODELAY"
952 " failed: %d\n", ret);
953 goto fail;
954 }
955 }
956
8359cf43 957 /* FIXME: Someone please explain why this is endian-safe */
e48354ce
NB		 958 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
959 (char *)&opt, sizeof(opt));
960 if (ret < 0) {
961 pr_err("kernel_setsockopt() for SO_REUSEADDR"
962 " failed\n");
963 goto fail;
964 }
965
9f9ef6d3
DK		 966 ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
967 (char *)&opt, sizeof(opt));
968 if (ret < 0) {
969 pr_err("kernel_setsockopt() for IP_FREEBIND"
970 " failed\n");
971 goto fail;
972 }
973
e48354ce
NB		 974 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
975 if (ret < 0) {
976 pr_err("kernel_bind() failed: %d\n", ret);
977 goto fail;
978 }
979
980 ret = kernel_listen(sock, backlog);
981 if (ret != 0) {
982 pr_err("kernel_listen() failed: %d\n", ret);
983 goto fail;
984 }
985
986 return 0;
e48354ce
NB		 987fail:
988 np->np_socket = NULL;
bf6932f4 989 if (sock)
e48354ce 990 sock_release(sock);
e48354ce
NB		 991 return ret;
992}
993
baa4d64b
NB		 994int iscsi_target_setup_login_socket(
995 struct iscsi_np *np,
996 struct __kernel_sockaddr_storage *sockaddr)
997{
998 struct iscsit_transport *t;
999 int rc;
1000
1001 t = iscsit_get_transport(np->np_network_transport);
1002 if (!t)
1003 return -EINVAL;
1004
1005 rc = t->iscsit_setup_np(np, sockaddr);
1006 if (rc < 0) {
1007 iscsit_put_transport(t);
1008 return rc;
1009 }
1010
1011 np->np_transport = t;
14f4b54f 1012 np->enabled = true;
baa4d64b
NB		 1013 return 0;
1014}
1015
1016int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1017{
1018 struct socket *new_sock, *sock = np->np_socket;
1019 struct sockaddr_in sock_in;
1020 struct sockaddr_in6 sock_in6;
1021 int rc, err;
1022
1023 rc = kernel_accept(sock, &new_sock, 0);
1024 if (rc < 0)
1025 return rc;
1026
1027 conn->sock = new_sock;
1028 conn->login_family = np->np_sockaddr.ss_family;
baa4d64b
NB		 1029
1030 if (np->np_sockaddr.ss_family == AF_INET6) {
1031 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1032
1033 rc = conn->sock->ops->getname(conn->sock,
1034 (struct sockaddr *)&sock_in6, &err, 1);
1035 if (!rc) {
dfecf611
CL		 1036 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1037 snprintf(conn->login_ip, sizeof(conn->login_ip), "[%pI6c]",
1038 &sock_in6.sin6_addr.in6_u);
1039 else
1040 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI4",
1041 &sock_in6.sin6_addr.s6_addr32[3]);
baa4d64b
NB		 1042 conn->login_port = ntohs(sock_in6.sin6_port);
1043 }
1044
1045 rc = conn->sock->ops->getname(conn->sock,
1046 (struct sockaddr *)&sock_in6, &err, 0);
1047 if (!rc) {
dfecf611
CL		 1048 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1049 snprintf(conn->local_ip, sizeof(conn->local_ip), "[%pI6c]",
1050 &sock_in6.sin6_addr.in6_u);
1051 else
1052 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI4",
1053 &sock_in6.sin6_addr.s6_addr32[3]);
baa4d64b
NB		 1054 conn->local_port = ntohs(sock_in6.sin6_port);
1055 }
1056 } else {
1057 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1058
1059 rc = conn->sock->ops->getname(conn->sock,
1060 (struct sockaddr *)&sock_in, &err, 1);
1061 if (!rc) {
1062 sprintf(conn->login_ip, "%pI4",
1063 &sock_in.sin_addr.s_addr);
1064 conn->login_port = ntohs(sock_in.sin_port);
1065 }
1066
1067 rc = conn->sock->ops->getname(conn->sock,
1068 (struct sockaddr *)&sock_in, &err, 0);
1069 if (!rc) {
1070 sprintf(conn->local_ip, "%pI4",
1071 &sock_in.sin_addr.s_addr);
1072 conn->local_port = ntohs(sock_in.sin_port);
1073 }
1074 }
1075
1076 return 0;
1077}
1078
1079int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1080{
1081 struct iscsi_login_req *login_req;
1082 u32 padding = 0, payload_length;
1083
1084 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1085 return -1;
1086
1087 login_req = (struct iscsi_login_req *)login->req;
1088 payload_length = ntoh24(login_req->dlength);
1089 padding = ((-payload_length) & 3);
1090
1091 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1092 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1093 login_req->flags, login_req->itt, login_req->cmdsn,
1094 login_req->exp_statsn, login_req->cid, payload_length);
1095 /*
1096 * Setup the initial iscsi_login values from the leading
1097 * login request PDU.
1098 */
1099 if (login->first_request) {
1100 login_req = (struct iscsi_login_req *)login->req;
1101 login->leading_connection = (!login_req->tsih) ? 1 : 0;
3e1c81a9 1102 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
baa4d64b
NB		 1103 login->version_min = login_req->min_version;
1104 login->version_max = login_req->max_version;
1105 memcpy(login->isid, login_req->isid, 6);
1106 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1107 login->init_task_tag = login_req->itt;
1108 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1109 login->cid = be16_to_cpu(login_req->cid);
1110 login->tsih = be16_to_cpu(login_req->tsih);
1111 }
1112
1113 if (iscsi_target_check_login_request(conn, login) < 0)
1114 return -1;
1115
1116 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1117 if (iscsi_login_rx_data(conn, login->req_buf,
1118 payload_length + padding) < 0)
1119 return -1;
1120
1121 return 0;
1122}
1123
1124int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1125 u32 length)
1126{
1127 if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1128 return -1;
1129
1130 return 0;
1131}
1132
1133static int
1134iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1135{
1136 int rc;
1137
1138 if (!t->owner) {
1139 conn->conn_transport = t;
1140 return 0;
1141 }
1142
1143 rc = try_module_get(t->owner);
1144 if (!rc) {
1145 pr_err("try_module_get() failed for %s\n", t->name);
1146 return -EINVAL;
1147 }
1148
1149 conn->conn_transport = t;
1150 return 0;
1151}
1152
a91eb7d9
NB		 1153void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1154 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1155{
1156 if (new_sess == false)
1157 goto old_sess_out;
1158
1159 pr_err("iSCSI Login negotiation failed.\n");
1160 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1161 ISCSI_LOGIN_STATUS_INIT_ERR);
1162 if (!zero_tsih || !conn->sess)
1163 goto old_sess_out;
1164 if (conn->sess->se_sess)
1165 transport_free_session(conn->sess->se_sess);
1166 if (conn->sess->session_index != 0) {
1167 spin_lock_bh(&sess_idr_lock);
1168 idr_remove(&sess_idr, conn->sess->session_index);
1169 spin_unlock_bh(&sess_idr_lock);
1170 }
1171 kfree(conn->sess->sess_ops);
1172 kfree(conn->sess);
1173
1174old_sess_out:
1175 iscsi_stop_login_thread_timer(np);
1176 /*
1177 * If login negotiation fails check if the Time2Retain timer
1178 * needs to be restarted.
1179 */
1180 if (!zero_tsih && conn->sess) {
1181 spin_lock_bh(&conn->sess->conn_lock);
1182 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1183 struct se_portal_group *se_tpg =
60bfcf8e 1184 &conn->tpg->tpg_se_tpg;
a91eb7d9
NB		 1185
1186 atomic_set(&conn->sess->session_continuation, 0);
1187 spin_unlock_bh(&conn->sess->conn_lock);
1188 spin_lock_bh(&se_tpg->session_lock);
1189 iscsit_start_time2retain_handler(conn->sess);
1190 spin_unlock_bh(&se_tpg->session_lock);
1191 } else
1192 spin_unlock_bh(&conn->sess->conn_lock);
1193 iscsit_dec_session_usage_count(conn->sess);
1194 }
1195
1196 if (!IS_ERR(conn->conn_rx_hash.tfm))
1197 crypto_free_hash(conn->conn_rx_hash.tfm);
1198 if (!IS_ERR(conn->conn_tx_hash.tfm))
1199 crypto_free_hash(conn->conn_tx_hash.tfm);
1200
1201 if (conn->conn_cpumask)
1202 free_cpumask_var(conn->conn_cpumask);
1203
1204 kfree(conn->conn_ops);
1205
1206 if (conn->param_list) {
1207 iscsi_release_param_list(conn->param_list);
1208 conn->param_list = NULL;
1209 }
1210 iscsi_target_nego_release(conn);
1211
1212 if (conn->sock) {
1213 sock_release(conn->sock);
1214 conn->sock = NULL;
1215 }
1216
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
NB		 1226 u8 *buffer, zero_tsih = 0;
1227 int ret = 0, rc, stop;
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);
1241 } else {
1242 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1243 }
1244 spin_unlock_bh(&np->np_thread_lock);
1245
e48354ce
NB		 1246 conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1247 if (!conn) {
1248 pr_err("Could not allocate memory for"
1249 " new connection\n");
e48354ce
NB		 1250 /* Get another socket */
1251 return 1;
1252 }
e48354ce
NB		 1253 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1254 conn->conn_state = TARG_CONN_STATE_FREE;
e48354ce 1255
baa4d64b
NB		 1256 if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1257 kfree(conn);
1258 return 1;
1259 }
e48354ce 1260
baa4d64b
NB		 1261 rc = np->np_transport->iscsit_accept_np(np, conn);
1262 if (rc == -ENOSYS) {
1263 complete(&np->np_restart_comp);
1264 iscsit_put_transport(conn->conn_transport);
1265 kfree(conn);
1266 conn = NULL;
1267 goto exit;
1268 } else if (rc < 0) {
1269 spin_lock_bh(&np->np_thread_lock);
1270 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1271 spin_unlock_bh(&np->np_thread_lock);
1272 complete(&np->np_restart_comp);
c9a03c12
NB		 1273 iscsit_put_transport(conn->conn_transport);
1274 kfree(conn);
1275 conn = NULL;
1276 if (ret == -ENODEV)
baa4d64b 1277 goto out;
baa4d64b
NB		 1278 /* Get another socket */
1279 return 1;
1280 }
1281 spin_unlock_bh(&np->np_thread_lock);
1282 iscsit_put_transport(conn->conn_transport);
1283 kfree(conn);
1284 conn = NULL;
1285 goto out;
e48354ce
NB		 1286 }
1287 /*
1288 * Perform the remaining iSCSI connection initialization items..
1289 */
baa4d64b
NB		 1290 login = iscsi_login_init_conn(conn);
1291 if (!login) {
e48354ce
NB		 1292 goto new_sess_out;
1293 }
1294
baa4d64b 1295 iscsi_start_login_thread_timer(np);
e48354ce 1296
baa4d64b
NB		 1297 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1298 conn->conn_state = TARG_CONN_STATE_XPT_UP;
1299 /*
1300 * This will process the first login request + payload..
1301 */
1302 rc = np->np_transport->iscsit_get_login_rx(conn, login);
1303 if (rc == 1)
1304 return 1;
1305 else if (rc < 0)
1306 goto new_sess_out;
66c7db68 1307
baa4d64b
NB		 1308 buffer = &login->req[0];
1309 pdu = (struct iscsi_login_req *)buffer;
e48354ce
NB		 1310 /*
1311 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1312 * when Status-Class != 0.
1313 */
baa4d64b 1314 conn->login_itt = pdu->itt;
e48354ce
NB		 1315
1316 spin_lock_bh(&np->np_thread_lock);
1317 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1318 spin_unlock_bh(&np->np_thread_lock);
1319 pr_err("iSCSI Network Portal on %s:%hu currently not"
1320 " active.\n", np->np_ip, np->np_port);
1321 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1322 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1323 goto new_sess_out;
1324 }
1325 spin_unlock_bh(&np->np_thread_lock);
1326
e48354ce
NB		 1327 conn->network_transport = np->np_network_transport;
1328
1329 pr_debug("Received iSCSI login request from %s on %s Network"
baa4d64b
NB		 1330 " Portal %s:%hu\n", conn->login_ip, np->np_transport->name,
1331 conn->local_ip, conn->local_port);
e48354ce
NB		 1332
1333 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1334 conn->conn_state = TARG_CONN_STATE_IN_LOGIN;
1335
1336 if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1337 pdu->min_version) < 0)
1338 goto new_sess_out;
1339
1340 zero_tsih = (pdu->tsih == 0x0000);
ee1b1b9c 1341 if (zero_tsih) {
e48354ce
NB		 1342 /*
1343 * This is the leading connection of a new session.
1344 * We wait until after authentication to check for
1345 * session reinstatement.
1346 */
1347 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1348 goto new_sess_out;
1349 } else {
1350 /*
1351 * Add a new connection to an existing session.
1352 * We check for a non-existant session in
1353 * iscsi_login_non_zero_tsih_s2() below based
1354 * on ISID/TSIH, but wait until after authentication
1355 * to check for connection reinstatement, etc.
1356 */
1357 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1358 goto new_sess_out;
1359 }
e48354ce 1360 /*
baa4d64b
NB		 1361 * SessionType: Discovery
1362 *
1363 * Locates Default Portal
1364 *
1365 * SessionType: Normal
1366 *
1367 * Locates Target Portal from NP -> Target IQN
e48354ce 1368 */
baa4d64b
NB		 1369 rc = iscsi_target_locate_portal(np, conn, login);
1370 if (rc < 0) {
e48354ce
NB		 1371 tpg = conn->tpg;
1372 goto new_sess_out;
1373 }
a91eb7d9 1374 login->zero_tsih = zero_tsih;
e48354ce
NB		 1375
1376 tpg = conn->tpg;
1377 if (!tpg) {
1378 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1379 goto new_sess_out;
1380 }
1381
1382 if (zero_tsih) {
baa4d64b 1383 if (iscsi_login_zero_tsih_s2(conn) < 0)
e48354ce 1384 goto new_sess_out;
e48354ce 1385 } else {
baa4d64b 1386 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
e48354ce 1387 goto old_sess_out;
e48354ce
NB		 1388 }
1389
a91eb7d9
NB		 1390 ret = iscsi_target_start_negotiation(login, conn);
1391 if (ret < 0)
e48354ce
NB		 1392 goto new_sess_out;
1393
1394 if (!conn->sess) {
1395 pr_err("struct iscsi_conn session pointer is NULL!\n");
1396 goto new_sess_out;
1397 }
1398
1399 iscsi_stop_login_thread_timer(np);
1400
1401 if (signal_pending(current))
1402 goto new_sess_out;
1403
a91eb7d9
NB		 1404 if (ret == 1) {
1405 tpg_np = conn->tpg_np;
e48354ce 1406
a91eb7d9
NB		 1407 ret = iscsi_post_login_handler(np, conn, zero_tsih);
1408 if (ret < 0)
1409 goto new_sess_out;
1410
1411 iscsit_deaccess_np(np, tpg, tpg_np);
1412 }
e48354ce 1413
e48354ce 1414 tpg = NULL;
a91eb7d9 1415 tpg_np = NULL;
e48354ce
NB		 1416 /* Get another socket */
1417 return 1;
1418
1419new_sess_out:
a91eb7d9 1420 new_sess = true;
e48354ce 1421old_sess_out:
a91eb7d9
NB		 1422 tpg_np = conn->tpg_np;
1423 iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1424 new_sess = false;
e48354ce
NB		 1425
1426 if (tpg) {
a91eb7d9 1427 iscsit_deaccess_np(np, tpg, tpg_np);
e48354ce 1428 tpg = NULL;
a91eb7d9 1429 tpg_np = NULL;
e48354ce
NB		 1430 }
1431
1432out:
1433 stop = kthread_should_stop();
e48354ce
NB		 1434 /* Wait for another socket.. */
1435 if (!stop)
1436 return 1;
baa4d64b 1437exit:
e48354ce
NB		 1438 iscsi_stop_login_thread_timer(np);
1439 spin_lock_bh(&np->np_thread_lock);
1440 np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1441 spin_unlock_bh(&np->np_thread_lock);
baa4d64b 1442
e48354ce
NB		 1443 return 0;
1444}
1445
1446int iscsi_target_login_thread(void *arg)
1447{
8359cf43 1448 struct iscsi_np *np = arg;
e48354ce
NB		 1449 int ret;
1450
1451 allow_signal(SIGINT);
1452
1453 while (!kthread_should_stop()) {
1454 ret = __iscsi_target_login_thread(np);
1455 /*
1456 * We break and exit here unless another sock_accept() call
1457 * is expected.
1458 */
1459 if (ret != 1)
1460 break;
1461 }
1462
1463 return 0;
1464}
Linux 6.x block layer and io_uring tree(s)