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Linux 4.16.11
[linux/fpc-iii.git] / drivers / target / iscsi / iscsi_target_login.c
blob64c5a57b92e4923a1b8298cdc71637bd03314276
1 /*******************************************************************************
2 * This file contains the login functions used by the iSCSI Target driver.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19 #include <crypto/hash.h>
20 #include <linux/module.h>
21 #include <linux/string.h>
22 #include <linux/kthread.h>
23 #include <linux/sched/signal.h>
24 #include <linux/idr.h>
25 #include <linux/tcp.h> /* TCP_NODELAY */
26 #include <net/ipv6.h> /* ipv6_addr_v4mapped() */
27 #include <scsi/iscsi_proto.h>
28 #include <target/target_core_base.h>
29 #include <target/target_core_fabric.h>
30
31 #include <target/iscsi/iscsi_target_core.h>
32 #include <target/iscsi/iscsi_target_stat.h>
33 #include "iscsi_target_device.h"
34 #include "iscsi_target_nego.h"
35 #include "iscsi_target_erl0.h"
36 #include "iscsi_target_erl2.h"
37 #include "iscsi_target_login.h"
38 #include "iscsi_target_tpg.h"
39 #include "iscsi_target_util.h"
40 #include "iscsi_target.h"
41 #include "iscsi_target_parameters.h"
42
43 #include <target/iscsi/iscsi_transport.h>
44
45 static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
46 {
47 struct iscsi_login *login;
48
49 login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
50 if (!login) {
51 pr_err("Unable to allocate memory for struct iscsi_login.\n");
52 return NULL;
53 }
54 conn->login = login;
55 login->conn = conn;
56 login->first_request = 1;
57
58 login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
59 if (!login->req_buf) {
60 pr_err("Unable to allocate memory for response buffer.\n");
61 goto out_login;
62 }
63
64 login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
65 if (!login->rsp_buf) {
66 pr_err("Unable to allocate memory for request buffer.\n");
67 goto out_req_buf;
68 }
69
70 conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
71 if (!conn->conn_ops) {
72 pr_err("Unable to allocate memory for"
73 " struct iscsi_conn_ops.\n");
74 goto out_rsp_buf;
75 }
76
77 init_waitqueue_head(&conn->queues_wq);
78 INIT_LIST_HEAD(&conn->conn_list);
79 INIT_LIST_HEAD(&conn->conn_cmd_list);
80 INIT_LIST_HEAD(&conn->immed_queue_list);
81 INIT_LIST_HEAD(&conn->response_queue_list);
82 init_completion(&conn->conn_post_wait_comp);
83 init_completion(&conn->conn_wait_comp);
84 init_completion(&conn->conn_wait_rcfr_comp);
85 init_completion(&conn->conn_waiting_on_uc_comp);
86 init_completion(&conn->conn_logout_comp);
87 init_completion(&conn->rx_half_close_comp);
88 init_completion(&conn->tx_half_close_comp);
89 init_completion(&conn->rx_login_comp);
90 spin_lock_init(&conn->cmd_lock);
91 spin_lock_init(&conn->conn_usage_lock);
92 spin_lock_init(&conn->immed_queue_lock);
93 spin_lock_init(&conn->nopin_timer_lock);
94 spin_lock_init(&conn->response_queue_lock);
95 spin_lock_init(&conn->state_lock);
96
97 if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
98 pr_err("Unable to allocate conn->conn_cpumask\n");
99 goto out_conn_ops;
100 }
101 conn->conn_login = login;
102
103 return login;
104
105 out_conn_ops:
106 kfree(conn->conn_ops);
107 out_rsp_buf:
108 kfree(login->rsp_buf);
109 out_req_buf:
110 kfree(login->req_buf);
111 out_login:
112 kfree(login);
113 return NULL;
114 }
115
116 /*
117 * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
118 * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
119 */
120 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
121 {
122 struct crypto_ahash *tfm;
123
124 /*
125 * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
126 * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
127 * to software 1x8 byte slicing from crc32c.ko
128 */
129 tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
130 if (IS_ERR(tfm)) {
131 pr_err("crypto_alloc_ahash() failed\n");
132 return -ENOMEM;
133 }
134
135 conn->conn_rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
136 if (!conn->conn_rx_hash) {
137 pr_err("ahash_request_alloc() failed for conn_rx_hash\n");
138 crypto_free_ahash(tfm);
139 return -ENOMEM;
140 }
141 ahash_request_set_callback(conn->conn_rx_hash, 0, NULL, NULL);
142
143 conn->conn_tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
144 if (!conn->conn_tx_hash) {
145 pr_err("ahash_request_alloc() failed for conn_tx_hash\n");
146 ahash_request_free(conn->conn_rx_hash);
147 conn->conn_rx_hash = NULL;
148 crypto_free_ahash(tfm);
149 return -ENOMEM;
150 }
151 ahash_request_set_callback(conn->conn_tx_hash, 0, NULL, NULL);
152
153 return 0;
154 }
155
156 static int iscsi_login_check_initiator_version(
157 struct iscsi_conn *conn,
158 u8 version_max,
159 u8 version_min)
160 {
161 if ((version_max != 0x00) || (version_min != 0x00)) {
162 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
163 " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
164 version_min, version_max);
165 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
166 ISCSI_LOGIN_STATUS_NO_VERSION);
167 return -1;
168 }
169
170 return 0;
171 }
172
173 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
174 {
175 int sessiontype;
176 struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
177 struct iscsi_portal_group *tpg = conn->tpg;
178 struct iscsi_session *sess = NULL, *sess_p = NULL;
179 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
180 struct se_session *se_sess, *se_sess_tmp;
181
182 initiatorname_param = iscsi_find_param_from_key(
183 INITIATORNAME, conn->param_list);
184 sessiontype_param = iscsi_find_param_from_key(
185 SESSIONTYPE, conn->param_list);
186 if (!initiatorname_param || !sessiontype_param) {
187 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
188 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
189 return -1;
190 }
191
192 sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
193
194 spin_lock_bh(&se_tpg->session_lock);
195 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
196 sess_list) {
197
198 sess_p = se_sess->fabric_sess_ptr;
199 spin_lock(&sess_p->conn_lock);
200 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
201 atomic_read(&sess_p->session_logout) ||
202 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
203 spin_unlock(&sess_p->conn_lock);
204 continue;
205 }
206 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
207 (!strcmp(sess_p->sess_ops->InitiatorName,
208 initiatorname_param->value) &&
209 (sess_p->sess_ops->SessionType == sessiontype))) {
210 atomic_set(&sess_p->session_reinstatement, 1);
211 atomic_set(&sess_p->session_fall_back_to_erl0, 1);
212 spin_unlock(&sess_p->conn_lock);
213 iscsit_inc_session_usage_count(sess_p);
214 iscsit_stop_time2retain_timer(sess_p);
215 sess = sess_p;
216 break;
217 }
218 spin_unlock(&sess_p->conn_lock);
219 }
220 spin_unlock_bh(&se_tpg->session_lock);
221 /*
222 * If the Time2Retain handler has expired, the session is already gone.
223 */
224 if (!sess)
225 return 0;
226
227 pr_debug("%s iSCSI Session SID %u is still active for %s,"
228 " performing session reinstatement.\n", (sessiontype) ?
229 "Discovery" : "Normal", sess->sid,
230 sess->sess_ops->InitiatorName);
231
232 spin_lock_bh(&sess->conn_lock);
233 if (sess->session_state == TARG_SESS_STATE_FAILED) {
234 spin_unlock_bh(&sess->conn_lock);
235 iscsit_dec_session_usage_count(sess);
236 iscsit_close_session(sess);
237 return 0;
238 }
239 spin_unlock_bh(&sess->conn_lock);
240
241 iscsit_stop_session(sess, 1, 1);
242 iscsit_dec_session_usage_count(sess);
243
244 iscsit_close_session(sess);
245 return 0;
246 }
247
248 static int iscsi_login_set_conn_values(
249 struct iscsi_session *sess,
250 struct iscsi_conn *conn,
251 __be16 cid)
252 {
253 int ret;
254 conn->sess = sess;
255 conn->cid = be16_to_cpu(cid);
256 /*
257 * Generate a random Status sequence number (statsn) for the new
258 * iSCSI connection.
259 */
260 ret = get_random_bytes_wait(&conn->stat_sn, sizeof(u32));
261 if (unlikely(ret))
262 return ret;
263
264 mutex_lock(&auth_id_lock);
265 conn->auth_id = iscsit_global->auth_id++;
266 mutex_unlock(&auth_id_lock);
267 return 0;
268 }
269
270 __printf(2, 3) int iscsi_change_param_sprintf(
271 struct iscsi_conn *conn,
272 const char *fmt, ...)
273 {
274 va_list args;
275 unsigned char buf[64];
276
277 memset(buf, 0, sizeof buf);
278
279 va_start(args, fmt);
280 vsnprintf(buf, sizeof buf, fmt, args);
281 va_end(args);
282
283 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
284 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
285 ISCSI_LOGIN_STATUS_NO_RESOURCES);
286 return -1;
287 }
288
289 return 0;
290 }
291 EXPORT_SYMBOL(iscsi_change_param_sprintf);
292
293 /*
294 * This is the leading connection of a new session,
295 * or session reinstatement.
296 */
297 static int iscsi_login_zero_tsih_s1(
298 struct iscsi_conn *conn,
299 unsigned char *buf)
300 {
301 struct iscsi_session *sess = NULL;
302 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
303 int ret;
304
305 sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
306 if (!sess) {
307 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
308 ISCSI_LOGIN_STATUS_NO_RESOURCES);
309 pr_err("Could not allocate memory for session\n");
310 return -ENOMEM;
311 }
312
313 ret = iscsi_login_set_conn_values(sess, conn, pdu->cid);
314 if (unlikely(ret)) {
315 kfree(sess);
316 return ret;
317 }
318 sess->init_task_tag = pdu->itt;
319 memcpy(&sess->isid, pdu->isid, 6);
320 sess->exp_cmd_sn = be32_to_cpu(pdu->cmdsn);
321 INIT_LIST_HEAD(&sess->sess_conn_list);
322 INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
323 INIT_LIST_HEAD(&sess->cr_active_list);
324 INIT_LIST_HEAD(&sess->cr_inactive_list);
325 init_completion(&sess->async_msg_comp);
326 init_completion(&sess->reinstatement_comp);
327 init_completion(&sess->session_wait_comp);
328 init_completion(&sess->session_waiting_on_uc_comp);
329 mutex_init(&sess->cmdsn_mutex);
330 spin_lock_init(&sess->conn_lock);
331 spin_lock_init(&sess->cr_a_lock);
332 spin_lock_init(&sess->cr_i_lock);
333 spin_lock_init(&sess->session_usage_lock);
334 spin_lock_init(&sess->ttt_lock);
335
336 timer_setup(&sess->time2retain_timer,
337 iscsit_handle_time2retain_timeout, 0);
338
339 idr_preload(GFP_KERNEL);
340 spin_lock_bh(&sess_idr_lock);
341 ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
342 if (ret >= 0)
343 sess->session_index = ret;
344 spin_unlock_bh(&sess_idr_lock);
345 idr_preload_end();
346
347 if (ret < 0) {
348 pr_err("idr_alloc() for sess_idr failed\n");
349 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
350 ISCSI_LOGIN_STATUS_NO_RESOURCES);
351 kfree(sess);
352 return -ENOMEM;
353 }
354
355 sess->creation_time = get_jiffies_64();
356 /*
357 * The FFP CmdSN window values will be allocated from the TPG's
358 * Initiator Node's ACL once the login has been successfully completed.
359 */
360 atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn));
361
362 sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
363 if (!sess->sess_ops) {
364 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
365 ISCSI_LOGIN_STATUS_NO_RESOURCES);
366 pr_err("Unable to allocate memory for"
367 " struct iscsi_sess_ops.\n");
368 kfree(sess);
369 return -ENOMEM;
370 }
371
372 sess->se_sess = transport_init_session(TARGET_PROT_NORMAL);
373 if (IS_ERR(sess->se_sess)) {
374 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
375 ISCSI_LOGIN_STATUS_NO_RESOURCES);
376 kfree(sess->sess_ops);
377 kfree(sess);
378 return -ENOMEM;
379 }
380
381 return 0;
382 }
383
384 static int iscsi_login_zero_tsih_s2(
385 struct iscsi_conn *conn)
386 {
387 struct iscsi_node_attrib *na;
388 struct iscsi_session *sess = conn->sess;
389 bool iser = false;
390
391 sess->tpg = conn->tpg;
392
393 /*
394 * Assign a new TPG Session Handle. Note this is protected with
395 * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
396 */
397 sess->tsih = ++sess->tpg->ntsih;
398 if (!sess->tsih)
399 sess->tsih = ++sess->tpg->ntsih;
400
401 /*
402 * Create the default params from user defined values..
403 */
404 if (iscsi_copy_param_list(&conn->param_list,
405 conn->tpg->param_list, 1) < 0) {
406 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
407 ISCSI_LOGIN_STATUS_NO_RESOURCES);
408 return -1;
409 }
410
411 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
412 iser = true;
413
414 iscsi_set_keys_to_negotiate(conn->param_list, iser);
415
416 if (sess->sess_ops->SessionType)
417 return iscsi_set_keys_irrelevant_for_discovery(
418 conn->param_list);
419
420 na = iscsit_tpg_get_node_attrib(sess);
421
422 /*
423 * Need to send TargetPortalGroupTag back in first login response
424 * on any iSCSI connection where the Initiator provides TargetName.
425 * See 5.3.1. Login Phase Start
426 *
427 * In our case, we have already located the struct iscsi_tiqn at this point.
428 */
429 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
430 return -1;
431
432 /*
433 * Workaround for Initiators that have broken connection recovery logic.
434 *
435 * "We would really like to get rid of this." Linux-iSCSI.org team
436 */
437 if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
438 return -1;
439
440 /*
441 * Set RDMAExtensions=Yes by default for iSER enabled network portals
442 */
443 if (iser) {
444 struct iscsi_param *param;
445 unsigned long mrdsl, off;
446 int rc;
447
448 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
449 return -1;
450
451 /*
452 * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
453 * Immediate Data + Unsolicited Data-OUT if necessary..
454 */
455 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
456 conn->param_list);
457 if (!param) {
458 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
459 ISCSI_LOGIN_STATUS_NO_RESOURCES);
460 return -1;
461 }
462 rc = kstrtoul(param->value, 0, &mrdsl);
463 if (rc < 0) {
464 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
465 ISCSI_LOGIN_STATUS_NO_RESOURCES);
466 return -1;
467 }
468 off = mrdsl % PAGE_SIZE;
469 if (!off)
470 goto check_prot;
471
472 if (mrdsl < PAGE_SIZE)
473 mrdsl = PAGE_SIZE;
474 else
475 mrdsl -= off;
476
477 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
478 " to PAGE_SIZE\n", mrdsl);
479
480 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
481 return -1;
482 /*
483 * ISER currently requires that ImmediateData + Unsolicited
484 * Data be disabled when protection / signature MRs are enabled.
485 */
486 check_prot:
487 if (sess->se_sess->sup_prot_ops &
488 (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
489 TARGET_PROT_DOUT_INSERT)) {
490
491 if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
492 return -1;
493
494 if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
495 return -1;
496
497 pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
498 " T10-PI enabled ISER session\n");
499 }
500 }
501
502 return 0;
503 }
504
505 static int iscsi_login_non_zero_tsih_s1(
506 struct iscsi_conn *conn,
507 unsigned char *buf)
508 {
509 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
510
511 return iscsi_login_set_conn_values(NULL, conn, pdu->cid);
512 }
513
514 /*
515 * Add a new connection to an existing session.
516 */
517 static int iscsi_login_non_zero_tsih_s2(
518 struct iscsi_conn *conn,
519 unsigned char *buf)
520 {
521 struct iscsi_portal_group *tpg = conn->tpg;
522 struct iscsi_session *sess = NULL, *sess_p = NULL;
523 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
524 struct se_session *se_sess, *se_sess_tmp;
525 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
526 bool iser = false;
527
528 spin_lock_bh(&se_tpg->session_lock);
529 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
530 sess_list) {
531
532 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
533 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
534 atomic_read(&sess_p->session_logout) ||
535 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
536 continue;
537 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
538 (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
539 iscsit_inc_session_usage_count(sess_p);
540 iscsit_stop_time2retain_timer(sess_p);
541 sess = sess_p;
542 break;
543 }
544 }
545 spin_unlock_bh(&se_tpg->session_lock);
546
547 /*
548 * If the Time2Retain handler has expired, the session is already gone.
549 */
550 if (!sess) {
551 pr_err("Initiator attempting to add a connection to"
552 " a non-existent session, rejecting iSCSI Login.\n");
553 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
554 ISCSI_LOGIN_STATUS_NO_SESSION);
555 return -1;
556 }
557
558 /*
559 * Stop the Time2Retain timer if this is a failed session, we restart
560 * the timer if the login is not successful.
561 */
562 spin_lock_bh(&sess->conn_lock);
563 if (sess->session_state == TARG_SESS_STATE_FAILED)
564 atomic_set(&sess->session_continuation, 1);
565 spin_unlock_bh(&sess->conn_lock);
566
567 if (iscsi_login_set_conn_values(sess, conn, pdu->cid) < 0 ||
568 iscsi_copy_param_list(&conn->param_list,
569 conn->tpg->param_list, 0) < 0) {
570 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
571 ISCSI_LOGIN_STATUS_NO_RESOURCES);
572 return -1;
573 }
574
575 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
576 iser = true;
577
578 iscsi_set_keys_to_negotiate(conn->param_list, iser);
579 /*
580 * Need to send TargetPortalGroupTag back in first login response
581 * on any iSCSI connection where the Initiator provides TargetName.
582 * See 5.3.1. Login Phase Start
583 *
584 * In our case, we have already located the struct iscsi_tiqn at this point.
585 */
586 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
587 return -1;
588
589 return 0;
590 }
591
592 int iscsi_login_post_auth_non_zero_tsih(
593 struct iscsi_conn *conn,
594 u16 cid,
595 u32 exp_statsn)
596 {
597 struct iscsi_conn *conn_ptr = NULL;
598 struct iscsi_conn_recovery *cr = NULL;
599 struct iscsi_session *sess = conn->sess;
600
601 /*
602 * By following item 5 in the login table, if we have found
603 * an existing ISID and a valid/existing TSIH and an existing
604 * CID we do connection reinstatement. Currently we dont not
605 * support it so we send back an non-zero status class to the
606 * initiator and release the new connection.
607 */
608 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
609 if (conn_ptr) {
610 pr_err("Connection exists with CID %hu for %s,"
611 " performing connection reinstatement.\n",
612 conn_ptr->cid, sess->sess_ops->InitiatorName);
613
614 iscsit_connection_reinstatement_rcfr(conn_ptr);
615 iscsit_dec_conn_usage_count(conn_ptr);
616 }
617
618 /*
619 * Check for any connection recovery entires containing CID.
620 * We use the original ExpStatSN sent in the first login request
621 * to acknowledge commands for the failed connection.
622 *
623 * Also note that an explict logout may have already been sent,
624 * but the response may not be sent due to additional connection
625 * loss.
626 */
627 if (sess->sess_ops->ErrorRecoveryLevel == 2) {
628 cr = iscsit_get_inactive_connection_recovery_entry(
629 sess, cid);
630 if (cr) {
631 pr_debug("Performing implicit logout"
632 " for connection recovery on CID: %hu\n",
633 conn->cid);
634 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
635 }
636 }
637
638 /*
639 * Else we follow item 4 from the login table in that we have
640 * found an existing ISID and a valid/existing TSIH and a new
641 * CID we go ahead and continue to add a new connection to the
642 * session.
643 */
644 pr_debug("Adding CID %hu to existing session for %s.\n",
645 cid, sess->sess_ops->InitiatorName);
646
647 if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
648 pr_err("Adding additional connection to this session"
649 " would exceed MaxConnections %d, login failed.\n",
650 sess->sess_ops->MaxConnections);
651 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
652 ISCSI_LOGIN_STATUS_ISID_ERROR);
653 return -1;
654 }
655
656 return 0;
657 }
658
659 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
660 {
661 struct iscsi_session *sess = conn->sess;
662 /*
663 * FIXME: Unsolicited NopIN support for ISER
664 */
665 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
666 return;
667
668 if (!sess->sess_ops->SessionType)
669 iscsit_start_nopin_timer(conn);
670 }
671
672 int iscsit_start_kthreads(struct iscsi_conn *conn)
673 {
674 int ret = 0;
675
676 spin_lock(&iscsit_global->ts_bitmap_lock);
677 conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
678 ISCSIT_BITMAP_BITS, get_order(1));
679 spin_unlock(&iscsit_global->ts_bitmap_lock);
680
681 if (conn->bitmap_id < 0) {
682 pr_err("bitmap_find_free_region() failed for"
683 " iscsit_start_kthreads()\n");
684 return -ENOMEM;
685 }
686
687 conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
688 "%s", ISCSI_TX_THREAD_NAME);
689 if (IS_ERR(conn->tx_thread)) {
690 pr_err("Unable to start iscsi_target_tx_thread\n");
691 ret = PTR_ERR(conn->tx_thread);
692 goto out_bitmap;
693 }
694 conn->tx_thread_active = true;
695
696 conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
697 "%s", ISCSI_RX_THREAD_NAME);
698 if (IS_ERR(conn->rx_thread)) {
699 pr_err("Unable to start iscsi_target_rx_thread\n");
700 ret = PTR_ERR(conn->rx_thread);
701 goto out_tx;
702 }
703 conn->rx_thread_active = true;
704
705 return 0;
706 out_tx:
707 send_sig(SIGINT, conn->tx_thread, 1);
708 kthread_stop(conn->tx_thread);
709 conn->tx_thread_active = false;
710 out_bitmap:
711 spin_lock(&iscsit_global->ts_bitmap_lock);
712 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
713 get_order(1));
714 spin_unlock(&iscsit_global->ts_bitmap_lock);
715 return ret;
716 }
717
718 void iscsi_post_login_handler(
719 struct iscsi_np *np,
720 struct iscsi_conn *conn,
721 u8 zero_tsih)
722 {
723 int stop_timer = 0;
724 struct iscsi_session *sess = conn->sess;
725 struct se_session *se_sess = sess->se_sess;
726 struct iscsi_portal_group *tpg = sess->tpg;
727 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
728
729 iscsit_inc_conn_usage_count(conn);
730
731 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
732 ISCSI_LOGIN_STATUS_ACCEPT);
733
734 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
735 conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
736
737 iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
738 /*
739 * SCSI Initiator -> SCSI Target Port Mapping
740 */
741 if (!zero_tsih) {
742 iscsi_set_session_parameters(sess->sess_ops,
743 conn->param_list, 0);
744 iscsi_release_param_list(conn->param_list);
745 conn->param_list = NULL;
746
747 spin_lock_bh(&sess->conn_lock);
748 atomic_set(&sess->session_continuation, 0);
749 if (sess->session_state == TARG_SESS_STATE_FAILED) {
750 pr_debug("Moving to"
751 " TARG_SESS_STATE_LOGGED_IN.\n");
752 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
753 stop_timer = 1;
754 }
755
756 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"
757 " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
758 &conn->local_sockaddr, tpg->tpgt);
759
760 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
761 atomic_inc(&sess->nconn);
762 pr_debug("Incremented iSCSI Connection count to %hu"
763 " from node: %s\n", atomic_read(&sess->nconn),
764 sess->sess_ops->InitiatorName);
765 spin_unlock_bh(&sess->conn_lock);
766
767 iscsi_post_login_start_timers(conn);
768 /*
769 * Determine CPU mask to ensure connection's RX and TX kthreads
770 * are scheduled on the same CPU.
771 */
772 iscsit_thread_get_cpumask(conn);
773 conn->conn_rx_reset_cpumask = 1;
774 conn->conn_tx_reset_cpumask = 1;
775 /*
776 * Wakeup the sleeping iscsi_target_rx_thread() now that
777 * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
778 */
779 complete(&conn->rx_login_comp);
780 iscsit_dec_conn_usage_count(conn);
781
782 if (stop_timer) {
783 spin_lock_bh(&se_tpg->session_lock);
784 iscsit_stop_time2retain_timer(sess);
785 spin_unlock_bh(&se_tpg->session_lock);
786 }
787 iscsit_dec_session_usage_count(sess);
788 return;
789 }
790
791 iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
792 iscsi_release_param_list(conn->param_list);
793 conn->param_list = NULL;
794
795 iscsit_determine_maxcmdsn(sess);
796
797 spin_lock_bh(&se_tpg->session_lock);
798 __transport_register_session(&sess->tpg->tpg_se_tpg,
799 se_sess->se_node_acl, se_sess, sess);
800 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
801 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
802
803 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
804 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
805 tpg->tpgt);
806
807 spin_lock_bh(&sess->conn_lock);
808 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
809 atomic_inc(&sess->nconn);
810 pr_debug("Incremented iSCSI Connection count to %hu from node:"
811 " %s\n", atomic_read(&sess->nconn),
812 sess->sess_ops->InitiatorName);
813 spin_unlock_bh(&sess->conn_lock);
814
815 sess->sid = tpg->sid++;
816 if (!sess->sid)
817 sess->sid = tpg->sid++;
818 pr_debug("Established iSCSI session from node: %s\n",
819 sess->sess_ops->InitiatorName);
820
821 tpg->nsessions++;
822 if (tpg->tpg_tiqn)
823 tpg->tpg_tiqn->tiqn_nsessions++;
824
825 pr_debug("Incremented number of active iSCSI sessions to %u on"
826 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
827 spin_unlock_bh(&se_tpg->session_lock);
828
829 iscsi_post_login_start_timers(conn);
830 /*
831 * Determine CPU mask to ensure connection's RX and TX kthreads
832 * are scheduled on the same CPU.
833 */
834 iscsit_thread_get_cpumask(conn);
835 conn->conn_rx_reset_cpumask = 1;
836 conn->conn_tx_reset_cpumask = 1;
837 /*
838 * Wakeup the sleeping iscsi_target_rx_thread() now that
839 * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
840 */
841 complete(&conn->rx_login_comp);
842 iscsit_dec_conn_usage_count(conn);
843 }
844
845 void iscsi_handle_login_thread_timeout(struct timer_list *t)
846 {
847 struct iscsi_np *np = from_timer(np, t, np_login_timer);
848
849 spin_lock_bh(&np->np_thread_lock);
850 pr_err("iSCSI Login timeout on Network Portal %pISpc\n",
851 &np->np_sockaddr);
852
853 if (np->np_login_timer_flags & ISCSI_TF_STOP) {
854 spin_unlock_bh(&np->np_thread_lock);
855 return;
856 }
857
858 if (np->np_thread)
859 send_sig(SIGINT, np->np_thread, 1);
860
861 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
862 spin_unlock_bh(&np->np_thread_lock);
863 }
864
865 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
866 {
867 /*
868 * This used the TA_LOGIN_TIMEOUT constant because at this
869 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
870 */
871 spin_lock_bh(&np->np_thread_lock);
872 np->np_login_timer_flags &= ~ISCSI_TF_STOP;
873 np->np_login_timer_flags |= ISCSI_TF_RUNNING;
874 mod_timer(&np->np_login_timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
875
876 pr_debug("Added timeout timer to iSCSI login request for"
877 " %u seconds.\n", TA_LOGIN_TIMEOUT);
878 spin_unlock_bh(&np->np_thread_lock);
879 }
880
881 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
882 {
883 spin_lock_bh(&np->np_thread_lock);
884 if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
885 spin_unlock_bh(&np->np_thread_lock);
886 return;
887 }
888 np->np_login_timer_flags |= ISCSI_TF_STOP;
889 spin_unlock_bh(&np->np_thread_lock);
890
891 del_timer_sync(&np->np_login_timer);
892
893 spin_lock_bh(&np->np_thread_lock);
894 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
895 spin_unlock_bh(&np->np_thread_lock);
896 }
897
898 int iscsit_setup_np(
899 struct iscsi_np *np,
900 struct sockaddr_storage *sockaddr)
901 {
902 struct socket *sock = NULL;
903 int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
904
905 switch (np->np_network_transport) {
906 case ISCSI_TCP:
907 np->np_ip_proto = IPPROTO_TCP;
908 np->np_sock_type = SOCK_STREAM;
909 break;
910 case ISCSI_SCTP_TCP:
911 np->np_ip_proto = IPPROTO_SCTP;
912 np->np_sock_type = SOCK_STREAM;
913 break;
914 case ISCSI_SCTP_UDP:
915 np->np_ip_proto = IPPROTO_SCTP;
916 np->np_sock_type = SOCK_SEQPACKET;
917 break;
918 default:
919 pr_err("Unsupported network_transport: %d\n",
920 np->np_network_transport);
921 return -EINVAL;
922 }
923
924 np->np_ip_proto = IPPROTO_TCP;
925 np->np_sock_type = SOCK_STREAM;
926
927 ret = sock_create(sockaddr->ss_family, np->np_sock_type,
928 np->np_ip_proto, &sock);
929 if (ret < 0) {
930 pr_err("sock_create() failed.\n");
931 return ret;
932 }
933 np->np_socket = sock;
934 /*
935 * Setup the np->np_sockaddr from the passed sockaddr setup
936 * in iscsi_target_configfs.c code..
937 */
938 memcpy(&np->np_sockaddr, sockaddr,
939 sizeof(struct sockaddr_storage));
940
941 if (sockaddr->ss_family == AF_INET6)
942 len = sizeof(struct sockaddr_in6);
943 else
944 len = sizeof(struct sockaddr_in);
945 /*
946 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
947 */
948 /* FIXME: Someone please explain why this is endian-safe */
949 opt = 1;
950 if (np->np_network_transport == ISCSI_TCP) {
951 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
952 (char *)&opt, sizeof(opt));
953 if (ret < 0) {
954 pr_err("kernel_setsockopt() for TCP_NODELAY"
955 " failed: %d\n", ret);
956 goto fail;
957 }
958 }
959
960 /* FIXME: Someone please explain why this is endian-safe */
961 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
962 (char *)&opt, sizeof(opt));
963 if (ret < 0) {
964 pr_err("kernel_setsockopt() for SO_REUSEADDR"
965 " failed\n");
966 goto fail;
967 }
968
969 ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
970 (char *)&opt, sizeof(opt));
971 if (ret < 0) {
972 pr_err("kernel_setsockopt() for IP_FREEBIND"
973 " failed\n");
974 goto fail;
975 }
976
977 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
978 if (ret < 0) {
979 pr_err("kernel_bind() failed: %d\n", ret);
980 goto fail;
981 }
982
983 ret = kernel_listen(sock, backlog);
984 if (ret != 0) {
985 pr_err("kernel_listen() failed: %d\n", ret);
986 goto fail;
987 }
988
989 return 0;
990 fail:
991 np->np_socket = NULL;
992 sock_release(sock);
993 return ret;
994 }
995
996 int iscsi_target_setup_login_socket(
997 struct iscsi_np *np,
998 struct sockaddr_storage *sockaddr)
999 {
1000 struct iscsit_transport *t;
1001 int rc;
1002
1003 t = iscsit_get_transport(np->np_network_transport);
1004 if (!t)
1005 return -EINVAL;
1006
1007 rc = t->iscsit_setup_np(np, sockaddr);
1008 if (rc < 0) {
1009 iscsit_put_transport(t);
1010 return rc;
1011 }
1012
1013 np->np_transport = t;
1014 np->enabled = true;
1015 return 0;
1016 }
1017
1018 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1019 {
1020 struct socket *new_sock, *sock = np->np_socket;
1021 struct sockaddr_in sock_in;
1022 struct sockaddr_in6 sock_in6;
1023 int rc, err;
1024
1025 rc = kernel_accept(sock, &new_sock, 0);
1026 if (rc < 0)
1027 return rc;
1028
1029 conn->sock = new_sock;
1030 conn->login_family = np->np_sockaddr.ss_family;
1031
1032 if (np->np_sockaddr.ss_family == AF_INET6) {
1033 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1034
1035 rc = conn->sock->ops->getname(conn->sock,
1036 (struct sockaddr *)&sock_in6, &err, 1);
1037 if (!rc) {
1038 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1039 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
1040 } else {
1041 /* Pretend to be an ipv4 socket */
1042 sock_in.sin_family = AF_INET;
1043 sock_in.sin_port = sock_in6.sin6_port;
1044 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1045 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1046 }
1047 }
1048
1049 rc = conn->sock->ops->getname(conn->sock,
1050 (struct sockaddr *)&sock_in6, &err, 0);
1051 if (!rc) {
1052 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1053 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
1054 } else {
1055 /* Pretend to be an ipv4 socket */
1056 sock_in.sin_family = AF_INET;
1057 sock_in.sin_port = sock_in6.sin6_port;
1058 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1059 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1060 }
1061 }
1062 } else {
1063 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1064
1065 rc = conn->sock->ops->getname(conn->sock,
1066 (struct sockaddr *)&sock_in, &err, 1);
1067 if (!rc)
1068 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1069
1070 rc = conn->sock->ops->getname(conn->sock,
1071 (struct sockaddr *)&sock_in, &err, 0);
1072 if (!rc)
1073 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1074 }
1075
1076 return 0;
1077 }
1078
1079 int 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;
1102 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
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
1124 int 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
1133 static int
1134 iscsit_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
1153 void 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)
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 conn->sess = NULL;
1174
1175 old_sess_out:
1176 iscsi_stop_login_thread_timer(np);
1177 /*
1178 * If login negotiation fails check if the Time2Retain timer
1179 * needs to be restarted.
1180 */
1181 if (!zero_tsih && conn->sess) {
1182 spin_lock_bh(&conn->sess->conn_lock);
1183 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1184 struct se_portal_group *se_tpg =
1185 &conn->tpg->tpg_se_tpg;
1186
1187 atomic_set(&conn->sess->session_continuation, 0);
1188 spin_unlock_bh(&conn->sess->conn_lock);
1189 spin_lock_bh(&se_tpg->session_lock);
1190 iscsit_start_time2retain_handler(conn->sess);
1191 spin_unlock_bh(&se_tpg->session_lock);
1192 } else
1193 spin_unlock_bh(&conn->sess->conn_lock);
1194 iscsit_dec_session_usage_count(conn->sess);
1195 }
1196
1197 ahash_request_free(conn->conn_tx_hash);
1198 if (conn->conn_rx_hash) {
1199 struct crypto_ahash *tfm;
1200
1201 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
1202 ahash_request_free(conn->conn_rx_hash);
1203 crypto_free_ahash(tfm);
1204 }
1205
1206 free_cpumask_var(conn->conn_cpumask);
1207
1208 kfree(conn->conn_ops);
1209
1210 if (conn->param_list) {
1211 iscsi_release_param_list(conn->param_list);
1212 conn->param_list = NULL;
1213 }
1214 iscsi_target_nego_release(conn);
1215
1216 if (conn->sock) {
1217 sock_release(conn->sock);
1218 conn->sock = NULL;
1219 }
1220
1221 if (conn->conn_transport->iscsit_wait_conn)
1222 conn->conn_transport->iscsit_wait_conn(conn);
1223
1224 if (conn->conn_transport->iscsit_free_conn)
1225 conn->conn_transport->iscsit_free_conn(conn);
1226
1227 iscsit_put_transport(conn->conn_transport);
1228 kfree(conn);
1229 }
1230
1231 static int __iscsi_target_login_thread(struct iscsi_np *np)
1232 {
1233 u8 *buffer, zero_tsih = 0;
1234 int ret = 0, rc;
1235 struct iscsi_conn *conn = NULL;
1236 struct iscsi_login *login;
1237 struct iscsi_portal_group *tpg = NULL;
1238 struct iscsi_login_req *pdu;
1239 struct iscsi_tpg_np *tpg_np;
1240 bool new_sess = false;
1241
1242 flush_signals(current);
1243
1244 spin_lock_bh(&np->np_thread_lock);
1245 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1246 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1247 spin_unlock_bh(&np->np_thread_lock);
1248 complete(&np->np_restart_comp);
1249 return 1;
1250 } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1251 spin_unlock_bh(&np->np_thread_lock);
1252 goto exit;
1253 } else {
1254 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1255 }
1256 spin_unlock_bh(&np->np_thread_lock);
1257
1258 conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1259 if (!conn) {
1260 pr_err("Could not allocate memory for"
1261 " new connection\n");
1262 /* Get another socket */
1263 return 1;
1264 }
1265 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1266 conn->conn_state = TARG_CONN_STATE_FREE;
1267
1268 timer_setup(&conn->nopin_response_timer,
1269 iscsit_handle_nopin_response_timeout, 0);
1270 timer_setup(&conn->nopin_timer, iscsit_handle_nopin_timeout, 0);
1271
1272 if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1273 kfree(conn);
1274 return 1;
1275 }
1276
1277 rc = np->np_transport->iscsit_accept_np(np, conn);
1278 if (rc == -ENOSYS) {
1279 complete(&np->np_restart_comp);
1280 iscsit_put_transport(conn->conn_transport);
1281 kfree(conn);
1282 conn = NULL;
1283 goto exit;
1284 } else if (rc < 0) {
1285 spin_lock_bh(&np->np_thread_lock);
1286 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1287 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1288 spin_unlock_bh(&np->np_thread_lock);
1289 complete(&np->np_restart_comp);
1290 iscsit_put_transport(conn->conn_transport);
1291 kfree(conn);
1292 conn = NULL;
1293 /* Get another socket */
1294 return 1;
1295 }
1296 spin_unlock_bh(&np->np_thread_lock);
1297 iscsit_put_transport(conn->conn_transport);
1298 kfree(conn);
1299 conn = NULL;
1300 goto out;
1301 }
1302 /*
1303 * Perform the remaining iSCSI connection initialization items..
1304 */
1305 login = iscsi_login_init_conn(conn);
1306 if (!login) {
1307 goto new_sess_out;
1308 }
1309
1310 iscsi_start_login_thread_timer(np);
1311
1312 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1313 conn->conn_state = TARG_CONN_STATE_XPT_UP;
1314 /*
1315 * This will process the first login request + payload..
1316 */
1317 rc = np->np_transport->iscsit_get_login_rx(conn, login);
1318 if (rc == 1)
1319 return 1;
1320 else if (rc < 0)
1321 goto new_sess_out;
1322
1323 buffer = &login->req[0];
1324 pdu = (struct iscsi_login_req *)buffer;
1325 /*
1326 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1327 * when Status-Class != 0.
1328 */
1329 conn->login_itt = pdu->itt;
1330
1331 spin_lock_bh(&np->np_thread_lock);
1332 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1333 spin_unlock_bh(&np->np_thread_lock);
1334 pr_err("iSCSI Network Portal on %pISpc currently not"
1335 " active.\n", &np->np_sockaddr);
1336 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1337 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1338 goto new_sess_out;
1339 }
1340 spin_unlock_bh(&np->np_thread_lock);
1341
1342 conn->network_transport = np->np_network_transport;
1343
1344 pr_debug("Received iSCSI login request from %pISpc on %s Network"
1345 " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name,
1346 &conn->local_sockaddr);
1347
1348 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1349 conn->conn_state = TARG_CONN_STATE_IN_LOGIN;
1350
1351 if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1352 pdu->min_version) < 0)
1353 goto new_sess_out;
1354
1355 zero_tsih = (pdu->tsih == 0x0000);
1356 if (zero_tsih) {
1357 /*
1358 * This is the leading connection of a new session.
1359 * We wait until after authentication to check for
1360 * session reinstatement.
1361 */
1362 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1363 goto new_sess_out;
1364 } else {
1365 /*
1366 * Add a new connection to an existing session.
1367 * We check for a non-existant session in
1368 * iscsi_login_non_zero_tsih_s2() below based
1369 * on ISID/TSIH, but wait until after authentication
1370 * to check for connection reinstatement, etc.
1371 */
1372 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1373 goto new_sess_out;
1374 }
1375 /*
1376 * SessionType: Discovery
1377 *
1378 * Locates Default Portal
1379 *
1380 * SessionType: Normal
1381 *
1382 * Locates Target Portal from NP -> Target IQN
1383 */
1384 rc = iscsi_target_locate_portal(np, conn, login);
1385 if (rc < 0) {
1386 tpg = conn->tpg;
1387 goto new_sess_out;
1388 }
1389 login->zero_tsih = zero_tsih;
1390
1391 if (conn->sess)
1392 conn->sess->se_sess->sup_prot_ops =
1393 conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1394
1395 tpg = conn->tpg;
1396 if (!tpg) {
1397 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1398 goto new_sess_out;
1399 }
1400
1401 if (zero_tsih) {
1402 if (iscsi_login_zero_tsih_s2(conn) < 0)
1403 goto new_sess_out;
1404 } else {
1405 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1406 goto old_sess_out;
1407 }
1408
1409 if (conn->conn_transport->iscsit_validate_params) {
1410 ret = conn->conn_transport->iscsit_validate_params(conn);
1411 if (ret < 0) {
1412 if (zero_tsih)
1413 goto new_sess_out;
1414 else
1415 goto old_sess_out;
1416 }
1417 }
1418
1419 ret = iscsi_target_start_negotiation(login, conn);
1420 if (ret < 0)
1421 goto new_sess_out;
1422
1423 iscsi_stop_login_thread_timer(np);
1424
1425 if (ret == 1) {
1426 tpg_np = conn->tpg_np;
1427
1428 iscsi_post_login_handler(np, conn, zero_tsih);
1429 iscsit_deaccess_np(np, tpg, tpg_np);
1430 }
1431
1432 tpg = NULL;
1433 tpg_np = NULL;
1434 /* Get another socket */
1435 return 1;
1436
1437 new_sess_out:
1438 new_sess = true;
1439 old_sess_out:
1440 tpg_np = conn->tpg_np;
1441 iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1442 new_sess = false;
1443
1444 if (tpg) {
1445 iscsit_deaccess_np(np, tpg, tpg_np);
1446 tpg = NULL;
1447 tpg_np = NULL;
1448 }
1449
1450 out:
1451 return 1;
1452
1453 exit:
1454 iscsi_stop_login_thread_timer(np);
1455 spin_lock_bh(&np->np_thread_lock);
1456 np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1457 spin_unlock_bh(&np->np_thread_lock);
1458
1459 return 0;
1460 }
1461
1462 int iscsi_target_login_thread(void *arg)
1463 {
1464 struct iscsi_np *np = arg;
1465 int ret;
1466
1467 allow_signal(SIGINT);
1468
1469 while (1) {
1470 ret = __iscsi_target_login_thread(np);
1471 /*
1472 * We break and exit here unless another sock_accept() call
1473 * is expected.
1474 */
1475 if (ret != 1)
1476 break;
1477 }
1478
1479 while (!kthread_should_stop()) {
1480 msleep(100);
1481 }
1482
1483 return 0;
1484 }
Linux with added FPC-III support