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