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 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 if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
415 return -1;
416 /*
417 * Set RDMAExtensions=Yes by default for iSER enabled network portals
418 */
419 if (iser) {
420 struct iscsi_param *param;
421 unsigned long mrdsl, off;
422 int rc;
423
424 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
425 return -1;
426
427 /*
428 * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
429 * Immediate Data + Unsolicitied Data-OUT if necessary..
430 */
431 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
432 conn->param_list);
433 if (!param) {
434 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
435 ISCSI_LOGIN_STATUS_NO_RESOURCES);
436 return -1;
437 }
438 rc = kstrtoul(param->value, 0, &mrdsl);
439 if (rc < 0) {
440 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
441 ISCSI_LOGIN_STATUS_NO_RESOURCES);
442 return -1;
443 }
444 off = mrdsl % PAGE_SIZE;
445 if (!off)
446 goto check_prot;
447
448 if (mrdsl < PAGE_SIZE)
449 mrdsl = PAGE_SIZE;
450 else
451 mrdsl -= off;
452
453 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
454 " to PAGE_SIZE\n", mrdsl);
455
456 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
457 return -1;
458 /*
459 * ISER currently requires that ImmediateData + Unsolicited
460 * Data be disabled when protection / signature MRs are enabled.
461 */
462 check_prot:
463 if (sess->se_sess->sup_prot_ops &
464 (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
465 TARGET_PROT_DOUT_INSERT)) {
466
467 if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
468 return -1;
469
470 if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
471 return -1;
472
473 pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
474 " T10-PI enabled ISER session\n");
475 }
476 }
477
478 return 0;
479 }
480
481 /*
482 * Remove PSTATE_NEGOTIATE for the four FIM related keys.
483 * The Initiator node will be able to enable FIM by proposing them itself.
484 */
iscsi_login_disable_FIM_keys(struct iscsi_param_list * param_list,struct iscsi_conn * conn)485 int iscsi_login_disable_FIM_keys(
486 struct iscsi_param_list *param_list,
487 struct iscsi_conn *conn)
488 {
489 struct iscsi_param *param;
490
491 param = iscsi_find_param_from_key("OFMarker", param_list);
492 if (!param) {
493 pr_err("iscsi_find_param_from_key() for"
494 " OFMarker failed\n");
495 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
496 ISCSI_LOGIN_STATUS_NO_RESOURCES);
497 return -1;
498 }
499 param->state &= ~PSTATE_NEGOTIATE;
500
501 param = iscsi_find_param_from_key("OFMarkInt", param_list);
502 if (!param) {
503 pr_err("iscsi_find_param_from_key() for"
504 " IFMarker failed\n");
505 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
506 ISCSI_LOGIN_STATUS_NO_RESOURCES);
507 return -1;
508 }
509 param->state &= ~PSTATE_NEGOTIATE;
510
511 param = iscsi_find_param_from_key("IFMarker", param_list);
512 if (!param) {
513 pr_err("iscsi_find_param_from_key() for"
514 " IFMarker failed\n");
515 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
516 ISCSI_LOGIN_STATUS_NO_RESOURCES);
517 return -1;
518 }
519 param->state &= ~PSTATE_NEGOTIATE;
520
521 param = iscsi_find_param_from_key("IFMarkInt", param_list);
522 if (!param) {
523 pr_err("iscsi_find_param_from_key() for"
524 " IFMarker failed\n");
525 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
526 ISCSI_LOGIN_STATUS_NO_RESOURCES);
527 return -1;
528 }
529 param->state &= ~PSTATE_NEGOTIATE;
530
531 return 0;
532 }
533
iscsi_login_non_zero_tsih_s1(struct iscsi_conn * conn,unsigned char * buf)534 static int iscsi_login_non_zero_tsih_s1(
535 struct iscsi_conn *conn,
536 unsigned char *buf)
537 {
538 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
539
540 iscsi_login_set_conn_values(NULL, conn, pdu->cid);
541 return 0;
542 }
543
544 /*
545 * Add a new connection to an existing session.
546 */
iscsi_login_non_zero_tsih_s2(struct iscsi_conn * conn,unsigned char * buf)547 static int iscsi_login_non_zero_tsih_s2(
548 struct iscsi_conn *conn,
549 unsigned char *buf)
550 {
551 struct iscsi_portal_group *tpg = conn->tpg;
552 struct iscsi_session *sess = NULL, *sess_p = NULL;
553 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
554 struct se_session *se_sess, *se_sess_tmp;
555 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
556 bool iser = false;
557
558 spin_lock_bh(&se_tpg->session_lock);
559 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
560 sess_list) {
561
562 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
563 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
564 atomic_read(&sess_p->session_logout) ||
565 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
566 continue;
567 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
568 (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
569 iscsit_inc_session_usage_count(sess_p);
570 iscsit_stop_time2retain_timer(sess_p);
571 sess = sess_p;
572 break;
573 }
574 }
575 spin_unlock_bh(&se_tpg->session_lock);
576
577 /*
578 * If the Time2Retain handler has expired, the session is already gone.
579 */
580 if (!sess) {
581 pr_err("Initiator attempting to add a connection to"
582 " a non-existent session, rejecting iSCSI Login.\n");
583 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
584 ISCSI_LOGIN_STATUS_NO_SESSION);
585 return -1;
586 }
587
588 /*
589 * Stop the Time2Retain timer if this is a failed session, we restart
590 * the timer if the login is not successful.
591 */
592 spin_lock_bh(&sess->conn_lock);
593 if (sess->session_state == TARG_SESS_STATE_FAILED)
594 atomic_set(&sess->session_continuation, 1);
595 spin_unlock_bh(&sess->conn_lock);
596
597 iscsi_login_set_conn_values(sess, conn, pdu->cid);
598
599 if (iscsi_copy_param_list(&conn->param_list,
600 conn->tpg->param_list, 0) < 0) {
601 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
602 ISCSI_LOGIN_STATUS_NO_RESOURCES);
603 return -1;
604 }
605
606 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
607 iser = true;
608
609 iscsi_set_keys_to_negotiate(conn->param_list, iser);
610 /*
611 * Need to send TargetPortalGroupTag back in first login response
612 * on any iSCSI connection where the Initiator provides TargetName.
613 * See 5.3.1. Login Phase Start
614 *
615 * In our case, we have already located the struct iscsi_tiqn at this point.
616 */
617 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
618 return -1;
619
620 return iscsi_login_disable_FIM_keys(conn->param_list, conn);
621 }
622
iscsi_login_post_auth_non_zero_tsih(struct iscsi_conn * conn,u16 cid,u32 exp_statsn)623 int iscsi_login_post_auth_non_zero_tsih(
624 struct iscsi_conn *conn,
625 u16 cid,
626 u32 exp_statsn)
627 {
628 struct iscsi_conn *conn_ptr = NULL;
629 struct iscsi_conn_recovery *cr = NULL;
630 struct iscsi_session *sess = conn->sess;
631
632 /*
633 * By following item 5 in the login table, if we have found
634 * an existing ISID and a valid/existing TSIH and an existing
635 * CID we do connection reinstatement. Currently we dont not
636 * support it so we send back an non-zero status class to the
637 * initiator and release the new connection.
638 */
639 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
640 if (conn_ptr) {
641 pr_err("Connection exists with CID %hu for %s,"
642 " performing connection reinstatement.\n",
643 conn_ptr->cid, sess->sess_ops->InitiatorName);
644
645 iscsit_connection_reinstatement_rcfr(conn_ptr);
646 iscsit_dec_conn_usage_count(conn_ptr);
647 }
648
649 /*
650 * Check for any connection recovery entires containing CID.
651 * We use the original ExpStatSN sent in the first login request
652 * to acknowledge commands for the failed connection.
653 *
654 * Also note that an explict logout may have already been sent,
655 * but the response may not be sent due to additional connection
656 * loss.
657 */
658 if (sess->sess_ops->ErrorRecoveryLevel == 2) {
659 cr = iscsit_get_inactive_connection_recovery_entry(
660 sess, cid);
661 if (cr) {
662 pr_debug("Performing implicit logout"
663 " for connection recovery on CID: %hu\n",
664 conn->cid);
665 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
666 }
667 }
668
669 /*
670 * Else we follow item 4 from the login table in that we have
671 * found an existing ISID and a valid/existing TSIH and a new
672 * CID we go ahead and continue to add a new connection to the
673 * session.
674 */
675 pr_debug("Adding CID %hu to existing session for %s.\n",
676 cid, sess->sess_ops->InitiatorName);
677
678 if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
679 pr_err("Adding additional connection to this session"
680 " would exceed MaxConnections %d, login failed.\n",
681 sess->sess_ops->MaxConnections);
682 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
683 ISCSI_LOGIN_STATUS_ISID_ERROR);
684 return -1;
685 }
686
687 return 0;
688 }
689
iscsi_post_login_start_timers(struct iscsi_conn * conn)690 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
691 {
692 struct iscsi_session *sess = conn->sess;
693 /*
694 * FIXME: Unsolicitied NopIN support for ISER
695 */
696 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
697 return;
698
699 if (!sess->sess_ops->SessionType)
700 iscsit_start_nopin_timer(conn);
701 }
702
iscsit_start_kthreads(struct iscsi_conn * conn)703 int iscsit_start_kthreads(struct iscsi_conn *conn)
704 {
705 int ret = 0;
706
707 spin_lock(&iscsit_global->ts_bitmap_lock);
708 conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
709 ISCSIT_BITMAP_BITS, get_order(1));
710 spin_unlock(&iscsit_global->ts_bitmap_lock);
711
712 if (conn->bitmap_id < 0) {
713 pr_err("bitmap_find_free_region() failed for"
714 " iscsit_start_kthreads()\n");
715 return -ENOMEM;
716 }
717
718 conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
719 "%s", ISCSI_TX_THREAD_NAME);
720 if (IS_ERR(conn->tx_thread)) {
721 pr_err("Unable to start iscsi_target_tx_thread\n");
722 ret = PTR_ERR(conn->tx_thread);
723 goto out_bitmap;
724 }
725 conn->tx_thread_active = true;
726
727 conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
728 "%s", ISCSI_RX_THREAD_NAME);
729 if (IS_ERR(conn->rx_thread)) {
730 pr_err("Unable to start iscsi_target_rx_thread\n");
731 ret = PTR_ERR(conn->rx_thread);
732 goto out_tx;
733 }
734 conn->rx_thread_active = true;
735
736 return 0;
737 out_tx:
738 send_sig(SIGINT, conn->tx_thread, 1);
739 kthread_stop(conn->tx_thread);
740 conn->tx_thread_active = false;
741 out_bitmap:
742 spin_lock(&iscsit_global->ts_bitmap_lock);
743 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
744 get_order(1));
745 spin_unlock(&iscsit_global->ts_bitmap_lock);
746 return ret;
747 }
748
iscsi_post_login_handler(struct iscsi_np * np,struct iscsi_conn * conn,u8 zero_tsih)749 void iscsi_post_login_handler(
750 struct iscsi_np *np,
751 struct iscsi_conn *conn,
752 u8 zero_tsih)
753 {
754 int stop_timer = 0;
755 struct iscsi_session *sess = conn->sess;
756 struct se_session *se_sess = sess->se_sess;
757 struct iscsi_portal_group *tpg = sess->tpg;
758 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
759
760 iscsit_inc_conn_usage_count(conn);
761
762 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
763 ISCSI_LOGIN_STATUS_ACCEPT);
764
765 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
766 conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
767
768 iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
769 iscsit_set_sync_and_steering_values(conn);
770 /*
771 * SCSI Initiator -> SCSI Target Port Mapping
772 */
773 if (!zero_tsih) {
774 iscsi_set_session_parameters(sess->sess_ops,
775 conn->param_list, 0);
776 iscsi_release_param_list(conn->param_list);
777 conn->param_list = NULL;
778
779 spin_lock_bh(&sess->conn_lock);
780 atomic_set(&sess->session_continuation, 0);
781 if (sess->session_state == TARG_SESS_STATE_FAILED) {
782 pr_debug("Moving to"
783 " TARG_SESS_STATE_LOGGED_IN.\n");
784 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
785 stop_timer = 1;
786 }
787
788 pr_debug("iSCSI Login successful on CID: %hu from %s to"
789 " %s:%hu,%hu\n", conn->cid, conn->login_ip,
790 conn->local_ip, conn->local_port, tpg->tpgt);
791
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"
795 " from node: %s\n", atomic_read(&sess->nconn),
796 sess->sess_ops->InitiatorName);
797 spin_unlock_bh(&sess->conn_lock);
798
799 iscsi_post_login_start_timers(conn);
800 /*
801 * Determine CPU mask to ensure connection's RX and TX kthreads
802 * are scheduled on the same CPU.
803 */
804 iscsit_thread_get_cpumask(conn);
805 conn->conn_rx_reset_cpumask = 1;
806 conn->conn_tx_reset_cpumask = 1;
807 /*
808 * Wakeup the sleeping iscsi_target_rx_thread() now that
809 * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
810 */
811 complete(&conn->rx_login_comp);
812 iscsit_dec_conn_usage_count(conn);
813
814 if (stop_timer) {
815 spin_lock_bh(&se_tpg->session_lock);
816 iscsit_stop_time2retain_timer(sess);
817 spin_unlock_bh(&se_tpg->session_lock);
818 }
819 iscsit_dec_session_usage_count(sess);
820 return;
821 }
822
823 iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
824 iscsi_release_param_list(conn->param_list);
825 conn->param_list = NULL;
826
827 iscsit_determine_maxcmdsn(sess);
828
829 spin_lock_bh(&se_tpg->session_lock);
830 __transport_register_session(&sess->tpg->tpg_se_tpg,
831 se_sess->se_node_acl, se_sess, sess);
832 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
833 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
834
835 pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
836 conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
837 tpg->tpgt);
838
839 spin_lock_bh(&sess->conn_lock);
840 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
841 atomic_inc(&sess->nconn);
842 pr_debug("Incremented iSCSI Connection count to %hu from node:"
843 " %s\n", atomic_read(&sess->nconn),
844 sess->sess_ops->InitiatorName);
845 spin_unlock_bh(&sess->conn_lock);
846
847 sess->sid = tpg->sid++;
848 if (!sess->sid)
849 sess->sid = tpg->sid++;
850 pr_debug("Established iSCSI session from node: %s\n",
851 sess->sess_ops->InitiatorName);
852
853 tpg->nsessions++;
854 if (tpg->tpg_tiqn)
855 tpg->tpg_tiqn->tiqn_nsessions++;
856
857 pr_debug("Incremented number of active iSCSI sessions to %u on"
858 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
859 spin_unlock_bh(&se_tpg->session_lock);
860
861 iscsi_post_login_start_timers(conn);
862 /*
863 * Determine CPU mask to ensure connection's RX and TX kthreads
864 * are scheduled on the same CPU.
865 */
866 iscsit_thread_get_cpumask(conn);
867 conn->conn_rx_reset_cpumask = 1;
868 conn->conn_tx_reset_cpumask = 1;
869 /*
870 * Wakeup the sleeping iscsi_target_rx_thread() now that
871 * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
872 */
873 complete(&conn->rx_login_comp);
874 iscsit_dec_conn_usage_count(conn);
875 }
876
iscsi_handle_login_thread_timeout(unsigned long data)877 static void iscsi_handle_login_thread_timeout(unsigned long data)
878 {
879 struct iscsi_np *np = (struct iscsi_np *) data;
880
881 spin_lock_bh(&np->np_thread_lock);
882 pr_err("iSCSI Login timeout on Network Portal %pISc:%hu\n",
883 &np->np_sockaddr, np->np_port);
884
885 if (np->np_login_timer_flags & ISCSI_TF_STOP) {
886 spin_unlock_bh(&np->np_thread_lock);
887 return;
888 }
889
890 if (np->np_thread)
891 send_sig(SIGINT, np->np_thread, 1);
892
893 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
894 spin_unlock_bh(&np->np_thread_lock);
895 }
896
iscsi_start_login_thread_timer(struct iscsi_np * np)897 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
898 {
899 /*
900 * This used the TA_LOGIN_TIMEOUT constant because at this
901 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
902 */
903 spin_lock_bh(&np->np_thread_lock);
904 init_timer(&np->np_login_timer);
905 np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
906 np->np_login_timer.data = (unsigned long)np;
907 np->np_login_timer.function = iscsi_handle_login_thread_timeout;
908 np->np_login_timer_flags &= ~ISCSI_TF_STOP;
909 np->np_login_timer_flags |= ISCSI_TF_RUNNING;
910 add_timer(&np->np_login_timer);
911
912 pr_debug("Added timeout timer to iSCSI login request for"
913 " %u seconds.\n", TA_LOGIN_TIMEOUT);
914 spin_unlock_bh(&np->np_thread_lock);
915 }
916
iscsi_stop_login_thread_timer(struct iscsi_np * np)917 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
918 {
919 spin_lock_bh(&np->np_thread_lock);
920 if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
921 spin_unlock_bh(&np->np_thread_lock);
922 return;
923 }
924 np->np_login_timer_flags |= ISCSI_TF_STOP;
925 spin_unlock_bh(&np->np_thread_lock);
926
927 del_timer_sync(&np->np_login_timer);
928
929 spin_lock_bh(&np->np_thread_lock);
930 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
931 spin_unlock_bh(&np->np_thread_lock);
932 }
933
iscsit_setup_np(struct iscsi_np * np,struct __kernel_sockaddr_storage * sockaddr)934 int iscsit_setup_np(
935 struct iscsi_np *np,
936 struct __kernel_sockaddr_storage *sockaddr)
937 {
938 struct socket *sock = NULL;
939 int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
940
941 switch (np->np_network_transport) {
942 case ISCSI_TCP:
943 np->np_ip_proto = IPPROTO_TCP;
944 np->np_sock_type = SOCK_STREAM;
945 break;
946 case ISCSI_SCTP_TCP:
947 np->np_ip_proto = IPPROTO_SCTP;
948 np->np_sock_type = SOCK_STREAM;
949 break;
950 case ISCSI_SCTP_UDP:
951 np->np_ip_proto = IPPROTO_SCTP;
952 np->np_sock_type = SOCK_SEQPACKET;
953 break;
954 default:
955 pr_err("Unsupported network_transport: %d\n",
956 np->np_network_transport);
957 return -EINVAL;
958 }
959
960 np->np_ip_proto = IPPROTO_TCP;
961 np->np_sock_type = SOCK_STREAM;
962
963 ret = sock_create(sockaddr->ss_family, np->np_sock_type,
964 np->np_ip_proto, &sock);
965 if (ret < 0) {
966 pr_err("sock_create() failed.\n");
967 return ret;
968 }
969 np->np_socket = sock;
970 /*
971 * Setup the np->np_sockaddr from the passed sockaddr setup
972 * in iscsi_target_configfs.c code..
973 */
974 memcpy(&np->np_sockaddr, sockaddr,
975 sizeof(struct __kernel_sockaddr_storage));
976
977 if (sockaddr->ss_family == AF_INET6)
978 len = sizeof(struct sockaddr_in6);
979 else
980 len = sizeof(struct sockaddr_in);
981 /*
982 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
983 */
984 /* FIXME: Someone please explain why this is endian-safe */
985 opt = 1;
986 if (np->np_network_transport == ISCSI_TCP) {
987 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
988 (char *)&opt, sizeof(opt));
989 if (ret < 0) {
990 pr_err("kernel_setsockopt() for TCP_NODELAY"
991 " failed: %d\n", ret);
992 goto fail;
993 }
994 }
995
996 /* FIXME: Someone please explain why this is endian-safe */
997 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
998 (char *)&opt, sizeof(opt));
999 if (ret < 0) {
1000 pr_err("kernel_setsockopt() for SO_REUSEADDR"
1001 " failed\n");
1002 goto fail;
1003 }
1004
1005 ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
1006 (char *)&opt, sizeof(opt));
1007 if (ret < 0) {
1008 pr_err("kernel_setsockopt() for IP_FREEBIND"
1009 " failed\n");
1010 goto fail;
1011 }
1012
1013 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
1014 if (ret < 0) {
1015 pr_err("kernel_bind() failed: %d\n", ret);
1016 goto fail;
1017 }
1018
1019 ret = kernel_listen(sock, backlog);
1020 if (ret != 0) {
1021 pr_err("kernel_listen() failed: %d\n", ret);
1022 goto fail;
1023 }
1024
1025 return 0;
1026 fail:
1027 np->np_socket = NULL;
1028 sock_release(sock);
1029 return ret;
1030 }
1031
iscsi_target_setup_login_socket(struct iscsi_np * np,struct __kernel_sockaddr_storage * sockaddr)1032 int iscsi_target_setup_login_socket(
1033 struct iscsi_np *np,
1034 struct __kernel_sockaddr_storage *sockaddr)
1035 {
1036 struct iscsit_transport *t;
1037 int rc;
1038
1039 t = iscsit_get_transport(np->np_network_transport);
1040 if (!t)
1041 return -EINVAL;
1042
1043 rc = t->iscsit_setup_np(np, sockaddr);
1044 if (rc < 0) {
1045 iscsit_put_transport(t);
1046 return rc;
1047 }
1048
1049 np->np_transport = t;
1050 np->enabled = true;
1051 return 0;
1052 }
1053
iscsit_accept_np(struct iscsi_np * np,struct iscsi_conn * conn)1054 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1055 {
1056 struct socket *new_sock, *sock = np->np_socket;
1057 struct sockaddr_in sock_in;
1058 struct sockaddr_in6 sock_in6;
1059 int rc, err;
1060
1061 rc = kernel_accept(sock, &new_sock, 0);
1062 if (rc < 0)
1063 return rc;
1064
1065 conn->sock = new_sock;
1066 conn->login_family = np->np_sockaddr.ss_family;
1067
1068 if (np->np_sockaddr.ss_family == AF_INET6) {
1069 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1070
1071 rc = conn->sock->ops->getname(conn->sock,
1072 (struct sockaddr *)&sock_in6, &err, 1);
1073 if (!rc) {
1074 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1075 snprintf(conn->login_ip, sizeof(conn->login_ip), "[%pI6c]",
1076 &sock_in6.sin6_addr.in6_u);
1077 else
1078 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI4",
1079 &sock_in6.sin6_addr.s6_addr32[3]);
1080 conn->login_port = ntohs(sock_in6.sin6_port);
1081 }
1082
1083 rc = conn->sock->ops->getname(conn->sock,
1084 (struct sockaddr *)&sock_in6, &err, 0);
1085 if (!rc) {
1086 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1087 snprintf(conn->local_ip, sizeof(conn->local_ip), "[%pI6c]",
1088 &sock_in6.sin6_addr.in6_u);
1089 else
1090 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI4",
1091 &sock_in6.sin6_addr.s6_addr32[3]);
1092 conn->local_port = ntohs(sock_in6.sin6_port);
1093 }
1094 } else {
1095 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1096
1097 rc = conn->sock->ops->getname(conn->sock,
1098 (struct sockaddr *)&sock_in, &err, 1);
1099 if (!rc) {
1100 sprintf(conn->login_ip, "%pI4",
1101 &sock_in.sin_addr.s_addr);
1102 conn->login_port = ntohs(sock_in.sin_port);
1103 }
1104
1105 rc = conn->sock->ops->getname(conn->sock,
1106 (struct sockaddr *)&sock_in, &err, 0);
1107 if (!rc) {
1108 sprintf(conn->local_ip, "%pI4",
1109 &sock_in.sin_addr.s_addr);
1110 conn->local_port = ntohs(sock_in.sin_port);
1111 }
1112 }
1113
1114 return 0;
1115 }
1116
iscsit_get_login_rx(struct iscsi_conn * conn,struct iscsi_login * login)1117 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1118 {
1119 struct iscsi_login_req *login_req;
1120 u32 padding = 0, payload_length;
1121
1122 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1123 return -1;
1124
1125 login_req = (struct iscsi_login_req *)login->req;
1126 payload_length = ntoh24(login_req->dlength);
1127 padding = ((-payload_length) & 3);
1128
1129 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1130 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1131 login_req->flags, login_req->itt, login_req->cmdsn,
1132 login_req->exp_statsn, login_req->cid, payload_length);
1133 /*
1134 * Setup the initial iscsi_login values from the leading
1135 * login request PDU.
1136 */
1137 if (login->first_request) {
1138 login_req = (struct iscsi_login_req *)login->req;
1139 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1140 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1141 login->version_min = login_req->min_version;
1142 login->version_max = login_req->max_version;
1143 memcpy(login->isid, login_req->isid, 6);
1144 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1145 login->init_task_tag = login_req->itt;
1146 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1147 login->cid = be16_to_cpu(login_req->cid);
1148 login->tsih = be16_to_cpu(login_req->tsih);
1149 }
1150
1151 if (iscsi_target_check_login_request(conn, login) < 0)
1152 return -1;
1153
1154 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1155 if (iscsi_login_rx_data(conn, login->req_buf,
1156 payload_length + padding) < 0)
1157 return -1;
1158
1159 return 0;
1160 }
1161
iscsit_put_login_tx(struct iscsi_conn * conn,struct iscsi_login * login,u32 length)1162 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1163 u32 length)
1164 {
1165 if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1166 return -1;
1167
1168 return 0;
1169 }
1170
1171 static int
iscsit_conn_set_transport(struct iscsi_conn * conn,struct iscsit_transport * t)1172 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1173 {
1174 int rc;
1175
1176 if (!t->owner) {
1177 conn->conn_transport = t;
1178 return 0;
1179 }
1180
1181 rc = try_module_get(t->owner);
1182 if (!rc) {
1183 pr_err("try_module_get() failed for %s\n", t->name);
1184 return -EINVAL;
1185 }
1186
1187 conn->conn_transport = t;
1188 return 0;
1189 }
1190
iscsi_target_login_sess_out(struct iscsi_conn * conn,struct iscsi_np * np,bool zero_tsih,bool new_sess)1191 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1192 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1193 {
1194 if (!new_sess)
1195 goto old_sess_out;
1196
1197 pr_err("iSCSI Login negotiation failed.\n");
1198 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1199 ISCSI_LOGIN_STATUS_INIT_ERR);
1200 if (!zero_tsih || !conn->sess)
1201 goto old_sess_out;
1202 if (conn->sess->se_sess)
1203 transport_free_session(conn->sess->se_sess);
1204 if (conn->sess->session_index != 0) {
1205 spin_lock_bh(&sess_idr_lock);
1206 idr_remove(&sess_idr, conn->sess->session_index);
1207 spin_unlock_bh(&sess_idr_lock);
1208 }
1209 kfree(conn->sess->sess_ops);
1210 kfree(conn->sess);
1211 conn->sess = NULL;
1212
1213 old_sess_out:
1214 iscsi_stop_login_thread_timer(np);
1215 /*
1216 * If login negotiation fails check if the Time2Retain timer
1217 * needs to be restarted.
1218 */
1219 if (!zero_tsih && conn->sess) {
1220 spin_lock_bh(&conn->sess->conn_lock);
1221 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1222 struct se_portal_group *se_tpg =
1223 &conn->tpg->tpg_se_tpg;
1224
1225 atomic_set(&conn->sess->session_continuation, 0);
1226 spin_unlock_bh(&conn->sess->conn_lock);
1227 spin_lock_bh(&se_tpg->session_lock);
1228 iscsit_start_time2retain_handler(conn->sess);
1229 spin_unlock_bh(&se_tpg->session_lock);
1230 } else
1231 spin_unlock_bh(&conn->sess->conn_lock);
1232 iscsit_dec_session_usage_count(conn->sess);
1233 }
1234
1235 if (!IS_ERR(conn->conn_rx_hash.tfm))
1236 crypto_free_hash(conn->conn_rx_hash.tfm);
1237 if (!IS_ERR(conn->conn_tx_hash.tfm))
1238 crypto_free_hash(conn->conn_tx_hash.tfm);
1239
1240 free_cpumask_var(conn->conn_cpumask);
1241
1242 kfree(conn->conn_ops);
1243
1244 if (conn->param_list) {
1245 iscsi_release_param_list(conn->param_list);
1246 conn->param_list = NULL;
1247 }
1248 iscsi_target_nego_release(conn);
1249
1250 if (conn->sock) {
1251 sock_release(conn->sock);
1252 conn->sock = NULL;
1253 }
1254
1255 if (conn->conn_transport->iscsit_wait_conn)
1256 conn->conn_transport->iscsit_wait_conn(conn);
1257
1258 if (conn->conn_transport->iscsit_free_conn)
1259 conn->conn_transport->iscsit_free_conn(conn);
1260
1261 iscsit_put_transport(conn->conn_transport);
1262 kfree(conn);
1263 }
1264
__iscsi_target_login_thread(struct iscsi_np * np)1265 static int __iscsi_target_login_thread(struct iscsi_np *np)
1266 {
1267 u8 *buffer, zero_tsih = 0;
1268 int ret = 0, rc;
1269 struct iscsi_conn *conn = NULL;
1270 struct iscsi_login *login;
1271 struct iscsi_portal_group *tpg = NULL;
1272 struct iscsi_login_req *pdu;
1273 struct iscsi_tpg_np *tpg_np;
1274 bool new_sess = false;
1275
1276 flush_signals(current);
1277
1278 spin_lock_bh(&np->np_thread_lock);
1279 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1280 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1281 complete(&np->np_restart_comp);
1282 } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1283 spin_unlock_bh(&np->np_thread_lock);
1284 goto exit;
1285 } else {
1286 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1287 }
1288 spin_unlock_bh(&np->np_thread_lock);
1289
1290 conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1291 if (!conn) {
1292 pr_err("Could not allocate memory for"
1293 " new connection\n");
1294 /* Get another socket */
1295 return 1;
1296 }
1297 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1298 conn->conn_state = TARG_CONN_STATE_FREE;
1299
1300 if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1301 kfree(conn);
1302 return 1;
1303 }
1304
1305 rc = np->np_transport->iscsit_accept_np(np, conn);
1306 if (rc == -ENOSYS) {
1307 complete(&np->np_restart_comp);
1308 iscsit_put_transport(conn->conn_transport);
1309 kfree(conn);
1310 conn = NULL;
1311 goto exit;
1312 } else if (rc < 0) {
1313 spin_lock_bh(&np->np_thread_lock);
1314 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1315 spin_unlock_bh(&np->np_thread_lock);
1316 complete(&np->np_restart_comp);
1317 iscsit_put_transport(conn->conn_transport);
1318 kfree(conn);
1319 conn = NULL;
1320 /* Get another socket */
1321 return 1;
1322 }
1323 spin_unlock_bh(&np->np_thread_lock);
1324 iscsit_put_transport(conn->conn_transport);
1325 kfree(conn);
1326 conn = NULL;
1327 goto out;
1328 }
1329 /*
1330 * Perform the remaining iSCSI connection initialization items..
1331 */
1332 login = iscsi_login_init_conn(conn);
1333 if (!login) {
1334 goto new_sess_out;
1335 }
1336
1337 iscsi_start_login_thread_timer(np);
1338
1339 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1340 conn->conn_state = TARG_CONN_STATE_XPT_UP;
1341 /*
1342 * This will process the first login request + payload..
1343 */
1344 rc = np->np_transport->iscsit_get_login_rx(conn, login);
1345 if (rc == 1)
1346 return 1;
1347 else if (rc < 0)
1348 goto new_sess_out;
1349
1350 buffer = &login->req[0];
1351 pdu = (struct iscsi_login_req *)buffer;
1352 /*
1353 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1354 * when Status-Class != 0.
1355 */
1356 conn->login_itt = pdu->itt;
1357
1358 spin_lock_bh(&np->np_thread_lock);
1359 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1360 spin_unlock_bh(&np->np_thread_lock);
1361 pr_err("iSCSI Network Portal on %pISc:%hu currently not"
1362 " active.\n", &np->np_sockaddr, np->np_port);
1363 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1364 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1365 goto new_sess_out;
1366 }
1367 spin_unlock_bh(&np->np_thread_lock);
1368
1369 conn->network_transport = np->np_network_transport;
1370
1371 pr_debug("Received iSCSI login request from %s on %s Network"
1372 " Portal %s:%hu\n", conn->login_ip, np->np_transport->name,
1373 conn->local_ip, conn->local_port);
1374
1375 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1376 conn->conn_state = TARG_CONN_STATE_IN_LOGIN;
1377
1378 if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1379 pdu->min_version) < 0)
1380 goto new_sess_out;
1381
1382 zero_tsih = (pdu->tsih == 0x0000);
1383 if (zero_tsih) {
1384 /*
1385 * This is the leading connection of a new session.
1386 * We wait until after authentication to check for
1387 * session reinstatement.
1388 */
1389 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1390 goto new_sess_out;
1391 } else {
1392 /*
1393 * Add a new connection to an existing session.
1394 * We check for a non-existant session in
1395 * iscsi_login_non_zero_tsih_s2() below based
1396 * on ISID/TSIH, but wait until after authentication
1397 * to check for connection reinstatement, etc.
1398 */
1399 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1400 goto new_sess_out;
1401 }
1402 /*
1403 * SessionType: Discovery
1404 *
1405 * Locates Default Portal
1406 *
1407 * SessionType: Normal
1408 *
1409 * Locates Target Portal from NP -> Target IQN
1410 */
1411 rc = iscsi_target_locate_portal(np, conn, login);
1412 if (rc < 0) {
1413 tpg = conn->tpg;
1414 goto new_sess_out;
1415 }
1416 login->zero_tsih = zero_tsih;
1417
1418 conn->sess->se_sess->sup_prot_ops =
1419 conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1420
1421 tpg = conn->tpg;
1422 if (!tpg) {
1423 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1424 goto new_sess_out;
1425 }
1426
1427 if (zero_tsih) {
1428 if (iscsi_login_zero_tsih_s2(conn) < 0)
1429 goto new_sess_out;
1430 } else {
1431 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1432 goto old_sess_out;
1433 }
1434
1435 ret = iscsi_target_start_negotiation(login, conn);
1436 if (ret < 0)
1437 goto new_sess_out;
1438
1439 iscsi_stop_login_thread_timer(np);
1440
1441 if (ret == 1) {
1442 tpg_np = conn->tpg_np;
1443
1444 iscsi_post_login_handler(np, conn, zero_tsih);
1445 iscsit_deaccess_np(np, tpg, tpg_np);
1446 }
1447
1448 tpg = NULL;
1449 tpg_np = NULL;
1450 /* Get another socket */
1451 return 1;
1452
1453 new_sess_out:
1454 new_sess = true;
1455 old_sess_out:
1456 tpg_np = conn->tpg_np;
1457 iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1458 new_sess = false;
1459
1460 if (tpg) {
1461 iscsit_deaccess_np(np, tpg, tpg_np);
1462 tpg = NULL;
1463 tpg_np = NULL;
1464 }
1465
1466 out:
1467 return 1;
1468
1469 exit:
1470 iscsi_stop_login_thread_timer(np);
1471 spin_lock_bh(&np->np_thread_lock);
1472 np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1473 spin_unlock_bh(&np->np_thread_lock);
1474
1475 return 0;
1476 }
1477
iscsi_target_login_thread(void * arg)1478 int iscsi_target_login_thread(void *arg)
1479 {
1480 struct iscsi_np *np = arg;
1481 int ret;
1482
1483 allow_signal(SIGINT);
1484
1485 while (1) {
1486 ret = __iscsi_target_login_thread(np);
1487 /*
1488 * We break and exit here unless another sock_accept() call
1489 * is expected.
1490 */
1491 if (ret != 1)
1492 break;
1493 }
1494
1495 return 0;
1496 }
1497