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