?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / drivers / target / iscsi / iscsi_target_login.c
blob8436d56c5f0c377e07caa7e0b1766051c11cf929
1 /*******************************************************************************
2 * This file contains the login functions used by the iSCSI Target driver.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19 #include <crypto/hash.h>
20 #include <linux/string.h>
21 #include <linux/kthread.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
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 */
116 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
117 {
118 struct crypto_ahash *tfm;
119
120 /*
121 * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
122 * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
123 * to software 1x8 byte slicing from crc32c.ko
124 */
125 tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
126 if (IS_ERR(tfm)) {
127 pr_err("crypto_alloc_ahash() failed\n");
128 return -ENOMEM;
129 }
130
131 conn->conn_rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
132 if (!conn->conn_rx_hash) {
133 pr_err("ahash_request_alloc() failed for conn_rx_hash\n");
134 crypto_free_ahash(tfm);
135 return -ENOMEM;
136 }
137 ahash_request_set_callback(conn->conn_rx_hash, 0, NULL, NULL);
138
139 conn->conn_tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
140 if (!conn->conn_tx_hash) {
141 pr_err("ahash_request_alloc() failed for conn_tx_hash\n");
142 ahash_request_free(conn->conn_rx_hash);
143 conn->conn_rx_hash = NULL;
144 crypto_free_ahash(tfm);
145 return -ENOMEM;
146 }
147 ahash_request_set_callback(conn->conn_tx_hash, 0, NULL, NULL);
148
149 return 0;
150 }
151
152 static int iscsi_login_check_initiator_version(
153 struct iscsi_conn *conn,
154 u8 version_max,
155 u8 version_min)
156 {
157 if ((version_max != 0x00) || (version_min != 0x00)) {
158 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
159 " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
160 version_min, version_max);
161 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
162 ISCSI_LOGIN_STATUS_NO_VERSION);
163 return -1;
164 }
165
166 return 0;
167 }
168
169 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
170 {
171 int sessiontype;
172 struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
173 struct iscsi_portal_group *tpg = conn->tpg;
174 struct iscsi_session *sess = NULL, *sess_p = NULL;
175 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
176 struct se_session *se_sess, *se_sess_tmp;
177
178 initiatorname_param = iscsi_find_param_from_key(
179 INITIATORNAME, conn->param_list);
180 sessiontype_param = iscsi_find_param_from_key(
181 SESSIONTYPE, conn->param_list);
182 if (!initiatorname_param || !sessiontype_param) {
183 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
184 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
185 return -1;
186 }
187
188 sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
189
190 spin_lock_bh(&se_tpg->session_lock);
191 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
192 sess_list) {
193
194 sess_p = se_sess->fabric_sess_ptr;
195 spin_lock(&sess_p->conn_lock);
196 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
197 atomic_read(&sess_p->session_logout) ||
198 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
199 spin_unlock(&sess_p->conn_lock);
200 continue;
201 }
202 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
203 (!strcmp(sess_p->sess_ops->InitiatorName,
204 initiatorname_param->value) &&
205 (sess_p->sess_ops->SessionType == sessiontype))) {
206 atomic_set(&sess_p->session_reinstatement, 1);
207 spin_unlock(&sess_p->conn_lock);
208 iscsit_inc_session_usage_count(sess_p);
209 iscsit_stop_time2retain_timer(sess_p);
210 sess = sess_p;
211 break;
212 }
213 spin_unlock(&sess_p->conn_lock);
214 }
215 spin_unlock_bh(&se_tpg->session_lock);
216 /*
217 * If the Time2Retain handler has expired, the session is already gone.
218 */
219 if (!sess)
220 return 0;
221
222 pr_debug("%s iSCSI Session SID %u is still active for %s,"
223 " preforming session reinstatement.\n", (sessiontype) ?
224 "Discovery" : "Normal", sess->sid,
225 sess->sess_ops->InitiatorName);
226
227 spin_lock_bh(&sess->conn_lock);
228 if (sess->session_state == TARG_SESS_STATE_FAILED) {
229 spin_unlock_bh(&sess->conn_lock);
230 iscsit_dec_session_usage_count(sess);
231 target_put_session(sess->se_sess);
232 return 0;
233 }
234 spin_unlock_bh(&sess->conn_lock);
235
236 iscsit_stop_session(sess, 1, 1);
237 iscsit_dec_session_usage_count(sess);
238
239 target_put_session(sess->se_sess);
240 return 0;
241 }
242
243 static void iscsi_login_set_conn_values(
244 struct iscsi_session *sess,
245 struct iscsi_conn *conn,
246 __be16 cid)
247 {
248 conn->sess = sess;
249 conn->cid = be16_to_cpu(cid);
250 /*
251 * Generate a random Status sequence number (statsn) for the new
252 * iSCSI connection.
253 */
254 get_random_bytes(&conn->stat_sn, sizeof(u32));
255
256 mutex_lock(&auth_id_lock);
257 conn->auth_id = iscsit_global->auth_id++;
258 mutex_unlock(&auth_id_lock);
259 }
260
261 static __printf(2, 3) int iscsi_change_param_sprintf(
262 struct iscsi_conn *conn,
263 const char *fmt, ...)
264 {
265 va_list args;
266 unsigned char buf[64];
267
268 memset(buf, 0, sizeof buf);
269
270 va_start(args, fmt);
271 vsnprintf(buf, sizeof buf, fmt, args);
272 va_end(args);
273
274 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
275 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
276 ISCSI_LOGIN_STATUS_NO_RESOURCES);
277 return -1;
278 }
279
280 return 0;
281 }
282
283 /*
284 * This is the leading connection of a new session,
285 * or session reinstatement.
286 */
287 static int iscsi_login_zero_tsih_s1(
288 struct iscsi_conn *conn,
289 unsigned char *buf)
290 {
291 struct iscsi_session *sess = NULL;
292 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
293 int ret;
294
295 sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
296 if (!sess) {
297 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
298 ISCSI_LOGIN_STATUS_NO_RESOURCES);
299 pr_err("Could not allocate memory for session\n");
300 return -ENOMEM;
301 }
302
303 iscsi_login_set_conn_values(sess, conn, pdu->cid);
304 sess->init_task_tag = pdu->itt;
305 memcpy(&sess->isid, pdu->isid, 6);
306 sess->exp_cmd_sn = be32_to_cpu(pdu->cmdsn);
307 INIT_LIST_HEAD(&sess->sess_conn_list);
308 INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
309 INIT_LIST_HEAD(&sess->cr_active_list);
310 INIT_LIST_HEAD(&sess->cr_inactive_list);
311 init_completion(&sess->async_msg_comp);
312 init_completion(&sess->reinstatement_comp);
313 init_completion(&sess->session_wait_comp);
314 init_completion(&sess->session_waiting_on_uc_comp);
315 mutex_init(&sess->cmdsn_mutex);
316 spin_lock_init(&sess->conn_lock);
317 spin_lock_init(&sess->cr_a_lock);
318 spin_lock_init(&sess->cr_i_lock);
319 spin_lock_init(&sess->session_usage_lock);
320 spin_lock_init(&sess->ttt_lock);
321
322 idr_preload(GFP_KERNEL);
323 spin_lock_bh(&sess_idr_lock);
324 ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
325 if (ret >= 0)
326 sess->session_index = ret;
327 spin_unlock_bh(&sess_idr_lock);
328 idr_preload_end();
329
330 if (ret < 0) {
331 pr_err("idr_alloc() for sess_idr failed\n");
332 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
333 ISCSI_LOGIN_STATUS_NO_RESOURCES);
334 kfree(sess);
335 return -ENOMEM;
336 }
337
338 sess->creation_time = get_jiffies_64();
339 /*
340 * The FFP CmdSN window values will be allocated from the TPG's
341 * Initiator Node's ACL once the login has been successfully completed.
342 */
343 atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn));
344
345 sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
346 if (!sess->sess_ops) {
347 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
348 ISCSI_LOGIN_STATUS_NO_RESOURCES);
349 pr_err("Unable to allocate memory for"
350 " struct iscsi_sess_ops.\n");
351 kfree(sess);
352 return -ENOMEM;
353 }
354
355 sess->se_sess = transport_init_session(TARGET_PROT_NORMAL);
356 if (IS_ERR(sess->se_sess)) {
357 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
358 ISCSI_LOGIN_STATUS_NO_RESOURCES);
359 kfree(sess->sess_ops);
360 kfree(sess);
361 return -ENOMEM;
362 }
363
364 return 0;
365 }
366
367 static int iscsi_login_zero_tsih_s2(
368 struct iscsi_conn *conn)
369 {
370 struct iscsi_node_attrib *na;
371 struct iscsi_session *sess = conn->sess;
372 bool iser = false;
373
374 sess->tpg = conn->tpg;
375
376 /*
377 * Assign a new TPG Session Handle. Note this is protected with
378 * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
379 */
380 sess->tsih = ++sess->tpg->ntsih;
381 if (!sess->tsih)
382 sess->tsih = ++sess->tpg->ntsih;
383
384 /*
385 * Create the default params from user defined values..
386 */
387 if (iscsi_copy_param_list(&conn->param_list,
388 conn->tpg->param_list, 1) < 0) {
389 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
390 ISCSI_LOGIN_STATUS_NO_RESOURCES);
391 return -1;
392 }
393
394 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
395 iser = true;
396
397 iscsi_set_keys_to_negotiate(conn->param_list, iser);
398
399 if (sess->sess_ops->SessionType)
400 return iscsi_set_keys_irrelevant_for_discovery(
401 conn->param_list);
402
403 na = iscsit_tpg_get_node_attrib(sess);
404
405 /*
406 * Need to send TargetPortalGroupTag back in first login response
407 * on any iSCSI connection where the Initiator provides TargetName.
408 * See 5.3.1. Login Phase Start
409 *
410 * In our case, we have already located the struct iscsi_tiqn at this point.
411 */
412 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
413 return -1;
414
415 /*
416 * Workaround for Initiators that have broken connection recovery logic.
417 *
418 * "We would really like to get rid of this." Linux-iSCSI.org team
419 */
420 if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
421 return -1;
422
423 /*
424 * Set RDMAExtensions=Yes by default for iSER enabled network portals
425 */
426 if (iser) {
427 struct iscsi_param *param;
428 unsigned long mrdsl, off;
429 int rc;
430
431 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
432 return -1;
433
434 /*
435 * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
436 * Immediate Data + Unsolicitied Data-OUT if necessary..
437 */
438 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
439 conn->param_list);
440 if (!param) {
441 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
442 ISCSI_LOGIN_STATUS_NO_RESOURCES);
443 return -1;
444 }
445 rc = kstrtoul(param->value, 0, &mrdsl);
446 if (rc < 0) {
447 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
448 ISCSI_LOGIN_STATUS_NO_RESOURCES);
449 return -1;
450 }
451 off = mrdsl % PAGE_SIZE;
452 if (!off)
453 goto check_prot;
454
455 if (mrdsl < PAGE_SIZE)
456 mrdsl = PAGE_SIZE;
457 else
458 mrdsl -= off;
459
460 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
461 " to PAGE_SIZE\n", mrdsl);
462
463 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
464 return -1;
465 /*
466 * ISER currently requires that ImmediateData + Unsolicited
467 * Data be disabled when protection / signature MRs are enabled.
468 */
469 check_prot:
470 if (sess->se_sess->sup_prot_ops &
471 (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
472 TARGET_PROT_DOUT_INSERT)) {
473
474 if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
475 return -1;
476
477 if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
478 return -1;
479
480 pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
481 " T10-PI enabled ISER session\n");
482 }
483 }
484
485 return 0;
486 }
487
488 static int iscsi_login_non_zero_tsih_s1(
489 struct iscsi_conn *conn,
490 unsigned char *buf)
491 {
492 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
493
494 iscsi_login_set_conn_values(NULL, conn, pdu->cid);
495 return 0;
496 }
497
498 /*
499 * Add a new connection to an existing session.
500 */
501 static int iscsi_login_non_zero_tsih_s2(
502 struct iscsi_conn *conn,
503 unsigned char *buf)
504 {
505 struct iscsi_portal_group *tpg = conn->tpg;
506 struct iscsi_session *sess = NULL, *sess_p = NULL;
507 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
508 struct se_session *se_sess, *se_sess_tmp;
509 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
510 bool iser = false;
511
512 spin_lock_bh(&se_tpg->session_lock);
513 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
514 sess_list) {
515
516 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
517 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
518 atomic_read(&sess_p->session_logout) ||
519 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
520 continue;
521 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
522 (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
523 iscsit_inc_session_usage_count(sess_p);
524 iscsit_stop_time2retain_timer(sess_p);
525 sess = sess_p;
526 break;
527 }
528 }
529 spin_unlock_bh(&se_tpg->session_lock);
530
531 /*
532 * If the Time2Retain handler has expired, the session is already gone.
533 */
534 if (!sess) {
535 pr_err("Initiator attempting to add a connection to"
536 " a non-existent session, rejecting iSCSI Login.\n");
537 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
538 ISCSI_LOGIN_STATUS_NO_SESSION);
539 return -1;
540 }
541
542 /*
543 * Stop the Time2Retain timer if this is a failed session, we restart
544 * the timer if the login is not successful.
545 */
546 spin_lock_bh(&sess->conn_lock);
547 if (sess->session_state == TARG_SESS_STATE_FAILED)
548 atomic_set(&sess->session_continuation, 1);
549 spin_unlock_bh(&sess->conn_lock);
550
551 iscsi_login_set_conn_values(sess, conn, pdu->cid);
552
553 if (iscsi_copy_param_list(&conn->param_list,
554 conn->tpg->param_list, 0) < 0) {
555 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
556 ISCSI_LOGIN_STATUS_NO_RESOURCES);
557 return -1;
558 }
559
560 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
561 iser = true;
562
563 iscsi_set_keys_to_negotiate(conn->param_list, iser);
564 /*
565 * Need to send TargetPortalGroupTag back in first login response
566 * on any iSCSI connection where the Initiator provides TargetName.
567 * See 5.3.1. Login Phase Start
568 *
569 * In our case, we have already located the struct iscsi_tiqn at this point.
570 */
571 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
572 return -1;
573
574 return 0;
575 }
576
577 int iscsi_login_post_auth_non_zero_tsih(
578 struct iscsi_conn *conn,
579 u16 cid,
580 u32 exp_statsn)
581 {
582 struct iscsi_conn *conn_ptr = NULL;
583 struct iscsi_conn_recovery *cr = NULL;
584 struct iscsi_session *sess = conn->sess;
585
586 /*
587 * By following item 5 in the login table, if we have found
588 * an existing ISID and a valid/existing TSIH and an existing
589 * CID we do connection reinstatement. Currently we dont not
590 * support it so we send back an non-zero status class to the
591 * initiator and release the new connection.
592 */
593 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
594 if (conn_ptr) {
595 pr_err("Connection exists with CID %hu for %s,"
596 " performing connection reinstatement.\n",
597 conn_ptr->cid, sess->sess_ops->InitiatorName);
598
599 iscsit_connection_reinstatement_rcfr(conn_ptr);
600 iscsit_dec_conn_usage_count(conn_ptr);
601 }
602
603 /*
604 * Check for any connection recovery entires containing CID.
605 * We use the original ExpStatSN sent in the first login request
606 * to acknowledge commands for the failed connection.
607 *
608 * Also note that an explict logout may have already been sent,
609 * but the response may not be sent due to additional connection
610 * loss.
611 */
612 if (sess->sess_ops->ErrorRecoveryLevel == 2) {
613 cr = iscsit_get_inactive_connection_recovery_entry(
614 sess, cid);
615 if (cr) {
616 pr_debug("Performing implicit logout"
617 " for connection recovery on CID: %hu\n",
618 conn->cid);
619 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
620 }
621 }
622
623 /*
624 * Else we follow item 4 from the login table in that we have
625 * found an existing ISID and a valid/existing TSIH and a new
626 * CID we go ahead and continue to add a new connection to the
627 * session.
628 */
629 pr_debug("Adding CID %hu to existing session for %s.\n",
630 cid, sess->sess_ops->InitiatorName);
631
632 if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
633 pr_err("Adding additional connection to this session"
634 " would exceed MaxConnections %d, login failed.\n",
635 sess->sess_ops->MaxConnections);
636 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
637 ISCSI_LOGIN_STATUS_ISID_ERROR);
638 return -1;
639 }
640
641 return 0;
642 }
643
644 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
645 {
646 struct iscsi_session *sess = conn->sess;
647 /*
648 * FIXME: Unsolicitied NopIN support for ISER
649 */
650 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
651 return;
652
653 if (!sess->sess_ops->SessionType)
654 iscsit_start_nopin_timer(conn);
655 }
656
657 int iscsit_start_kthreads(struct iscsi_conn *conn)
658 {
659 int ret = 0;
660
661 spin_lock(&iscsit_global->ts_bitmap_lock);
662 conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
663 ISCSIT_BITMAP_BITS, get_order(1));
664 spin_unlock(&iscsit_global->ts_bitmap_lock);
665
666 if (conn->bitmap_id < 0) {
667 pr_err("bitmap_find_free_region() failed for"
668 " iscsit_start_kthreads()\n");
669 return -ENOMEM;
670 }
671
672 conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
673 "%s", ISCSI_TX_THREAD_NAME);
674 if (IS_ERR(conn->tx_thread)) {
675 pr_err("Unable to start iscsi_target_tx_thread\n");
676 ret = PTR_ERR(conn->tx_thread);
677 goto out_bitmap;
678 }
679 conn->tx_thread_active = true;
680
681 conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
682 "%s", ISCSI_RX_THREAD_NAME);
683 if (IS_ERR(conn->rx_thread)) {
684 pr_err("Unable to start iscsi_target_rx_thread\n");
685 ret = PTR_ERR(conn->rx_thread);
686 goto out_tx;
687 }
688 conn->rx_thread_active = true;
689
690 return 0;
691 out_tx:
692 send_sig(SIGINT, conn->tx_thread, 1);
693 kthread_stop(conn->tx_thread);
694 conn->tx_thread_active = false;
695 out_bitmap:
696 spin_lock(&iscsit_global->ts_bitmap_lock);
697 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
698 get_order(1));
699 spin_unlock(&iscsit_global->ts_bitmap_lock);
700 return ret;
701 }
702
703 void iscsi_post_login_handler(
704 struct iscsi_np *np,
705 struct iscsi_conn *conn,
706 u8 zero_tsih)
707 {
708 int stop_timer = 0;
709 struct iscsi_session *sess = conn->sess;
710 struct se_session *se_sess = sess->se_sess;
711 struct iscsi_portal_group *tpg = sess->tpg;
712 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
713
714 iscsit_inc_conn_usage_count(conn);
715
716 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
717 ISCSI_LOGIN_STATUS_ACCEPT);
718
719 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
720 conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
721
722 iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
723 /*
724 * SCSI Initiator -> SCSI Target Port Mapping
725 */
726 if (!zero_tsih) {
727 iscsi_set_session_parameters(sess->sess_ops,
728 conn->param_list, 0);
729 iscsi_release_param_list(conn->param_list);
730 conn->param_list = NULL;
731
732 spin_lock_bh(&sess->conn_lock);
733 atomic_set(&sess->session_continuation, 0);
734 if (sess->session_state == TARG_SESS_STATE_FAILED) {
735 pr_debug("Moving to"
736 " TARG_SESS_STATE_LOGGED_IN.\n");
737 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
738 stop_timer = 1;
739 }
740
741 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"
742 " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
743 &conn->local_sockaddr, tpg->tpgt);
744
745 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
746 atomic_inc(&sess->nconn);
747 pr_debug("Incremented iSCSI Connection count to %hu"
748 " from node: %s\n", atomic_read(&sess->nconn),
749 sess->sess_ops->InitiatorName);
750 spin_unlock_bh(&sess->conn_lock);
751
752 iscsi_post_login_start_timers(conn);
753 /*
754 * Determine CPU mask to ensure connection's RX and TX kthreads
755 * are scheduled on the same CPU.
756 */
757 iscsit_thread_get_cpumask(conn);
758 conn->conn_rx_reset_cpumask = 1;
759 conn->conn_tx_reset_cpumask = 1;
760 /*
761 * Wakeup the sleeping iscsi_target_rx_thread() now that
762 * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
763 */
764 complete(&conn->rx_login_comp);
765 iscsit_dec_conn_usage_count(conn);
766
767 if (stop_timer) {
768 spin_lock_bh(&se_tpg->session_lock);
769 iscsit_stop_time2retain_timer(sess);
770 spin_unlock_bh(&se_tpg->session_lock);
771 }
772 iscsit_dec_session_usage_count(sess);
773 return;
774 }
775
776 iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
777 iscsi_release_param_list(conn->param_list);
778 conn->param_list = NULL;
779
780 iscsit_determine_maxcmdsn(sess);
781
782 spin_lock_bh(&se_tpg->session_lock);
783 __transport_register_session(&sess->tpg->tpg_se_tpg,
784 se_sess->se_node_acl, se_sess, sess);
785 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
786 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
787
788 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
789 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
790 tpg->tpgt);
791
792 spin_lock_bh(&sess->conn_lock);
793 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
794 atomic_inc(&sess->nconn);
795 pr_debug("Incremented iSCSI Connection count to %hu from node:"
796 " %s\n", atomic_read(&sess->nconn),
797 sess->sess_ops->InitiatorName);
798 spin_unlock_bh(&sess->conn_lock);
799
800 sess->sid = tpg->sid++;
801 if (!sess->sid)
802 sess->sid = tpg->sid++;
803 pr_debug("Established iSCSI session from node: %s\n",
804 sess->sess_ops->InitiatorName);
805
806 tpg->nsessions++;
807 if (tpg->tpg_tiqn)
808 tpg->tpg_tiqn->tiqn_nsessions++;
809
810 pr_debug("Incremented number of active iSCSI sessions to %u on"
811 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
812 spin_unlock_bh(&se_tpg->session_lock);
813
814 iscsi_post_login_start_timers(conn);
815 /*
816 * Determine CPU mask to ensure connection's RX and TX kthreads
817 * are scheduled on the same CPU.
818 */
819 iscsit_thread_get_cpumask(conn);
820 conn->conn_rx_reset_cpumask = 1;
821 conn->conn_tx_reset_cpumask = 1;
822 /*
823 * Wakeup the sleeping iscsi_target_rx_thread() now that
824 * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
825 */
826 complete(&conn->rx_login_comp);
827 iscsit_dec_conn_usage_count(conn);
828 }
829
830 static void iscsi_handle_login_thread_timeout(unsigned long data)
831 {
832 struct iscsi_np *np = (struct iscsi_np *) data;
833
834 spin_lock_bh(&np->np_thread_lock);
835 pr_err("iSCSI Login timeout on Network Portal %pISpc\n",
836 &np->np_sockaddr);
837
838 if (np->np_login_timer_flags & ISCSI_TF_STOP) {
839 spin_unlock_bh(&np->np_thread_lock);
840 return;
841 }
842
843 if (np->np_thread)
844 send_sig(SIGINT, np->np_thread, 1);
845
846 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
847 spin_unlock_bh(&np->np_thread_lock);
848 }
849
850 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
851 {
852 /*
853 * This used the TA_LOGIN_TIMEOUT constant because at this
854 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
855 */
856 spin_lock_bh(&np->np_thread_lock);
857 init_timer(&np->np_login_timer);
858 np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
859 np->np_login_timer.data = (unsigned long)np;
860 np->np_login_timer.function = iscsi_handle_login_thread_timeout;
861 np->np_login_timer_flags &= ~ISCSI_TF_STOP;
862 np->np_login_timer_flags |= ISCSI_TF_RUNNING;
863 add_timer(&np->np_login_timer);
864
865 pr_debug("Added timeout timer to iSCSI login request for"
866 " %u seconds.\n", TA_LOGIN_TIMEOUT);
867 spin_unlock_bh(&np->np_thread_lock);
868 }
869
870 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
871 {
872 spin_lock_bh(&np->np_thread_lock);
873 if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
874 spin_unlock_bh(&np->np_thread_lock);
875 return;
876 }
877 np->np_login_timer_flags |= ISCSI_TF_STOP;
878 spin_unlock_bh(&np->np_thread_lock);
879
880 del_timer_sync(&np->np_login_timer);
881
882 spin_lock_bh(&np->np_thread_lock);
883 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
884 spin_unlock_bh(&np->np_thread_lock);
885 }
886
887 int iscsit_setup_np(
888 struct iscsi_np *np,
889 struct sockaddr_storage *sockaddr)
890 {
891 struct socket *sock = NULL;
892 int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
893
894 switch (np->np_network_transport) {
895 case ISCSI_TCP:
896 np->np_ip_proto = IPPROTO_TCP;
897 np->np_sock_type = SOCK_STREAM;
898 break;
899 case ISCSI_SCTP_TCP:
900 np->np_ip_proto = IPPROTO_SCTP;
901 np->np_sock_type = SOCK_STREAM;
902 break;
903 case ISCSI_SCTP_UDP:
904 np->np_ip_proto = IPPROTO_SCTP;
905 np->np_sock_type = SOCK_SEQPACKET;
906 break;
907 default:
908 pr_err("Unsupported network_transport: %d\n",
909 np->np_network_transport);
910 return -EINVAL;
911 }
912
913 np->np_ip_proto = IPPROTO_TCP;
914 np->np_sock_type = SOCK_STREAM;
915
916 ret = sock_create(sockaddr->ss_family, np->np_sock_type,
917 np->np_ip_proto, &sock);
918 if (ret < 0) {
919 pr_err("sock_create() failed.\n");
920 return ret;
921 }
922 np->np_socket = sock;
923 /*
924 * Setup the np->np_sockaddr from the passed sockaddr setup
925 * in iscsi_target_configfs.c code..
926 */
927 memcpy(&np->np_sockaddr, sockaddr,
928 sizeof(struct sockaddr_storage));
929
930 if (sockaddr->ss_family == AF_INET6)
931 len = sizeof(struct sockaddr_in6);
932 else
933 len = sizeof(struct sockaddr_in);
934 /*
935 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
936 */
937 /* FIXME: Someone please explain why this is endian-safe */
938 opt = 1;
939 if (np->np_network_transport == ISCSI_TCP) {
940 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
941 (char *)&opt, sizeof(opt));
942 if (ret < 0) {
943 pr_err("kernel_setsockopt() for TCP_NODELAY"
944 " failed: %d\n", ret);
945 goto fail;
946 }
947 }
948
949 /* FIXME: Someone please explain why this is endian-safe */
950 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
951 (char *)&opt, sizeof(opt));
952 if (ret < 0) {
953 pr_err("kernel_setsockopt() for SO_REUSEADDR"
954 " failed\n");
955 goto fail;
956 }
957
958 ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
959 (char *)&opt, sizeof(opt));
960 if (ret < 0) {
961 pr_err("kernel_setsockopt() for IP_FREEBIND"
962 " failed\n");
963 goto fail;
964 }
965
966 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
967 if (ret < 0) {
968 pr_err("kernel_bind() failed: %d\n", ret);
969 goto fail;
970 }
971
972 ret = kernel_listen(sock, backlog);
973 if (ret != 0) {
974 pr_err("kernel_listen() failed: %d\n", ret);
975 goto fail;
976 }
977
978 return 0;
979 fail:
980 np->np_socket = NULL;
981 sock_release(sock);
982 return ret;
983 }
984
985 int iscsi_target_setup_login_socket(
986 struct iscsi_np *np,
987 struct sockaddr_storage *sockaddr)
988 {
989 struct iscsit_transport *t;
990 int rc;
991
992 t = iscsit_get_transport(np->np_network_transport);
993 if (!t)
994 return -EINVAL;
995
996 rc = t->iscsit_setup_np(np, sockaddr);
997 if (rc < 0) {
998 iscsit_put_transport(t);
999 return rc;
1000 }
1001
1002 np->np_transport = t;
1003 np->enabled = true;
1004 return 0;
1005 }
1006
1007 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1008 {
1009 struct socket *new_sock, *sock = np->np_socket;
1010 struct sockaddr_in sock_in;
1011 struct sockaddr_in6 sock_in6;
1012 int rc, err;
1013
1014 rc = kernel_accept(sock, &new_sock, 0);
1015 if (rc < 0)
1016 return rc;
1017
1018 conn->sock = new_sock;
1019 conn->login_family = np->np_sockaddr.ss_family;
1020
1021 if (np->np_sockaddr.ss_family == AF_INET6) {
1022 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1023
1024 rc = conn->sock->ops->getname(conn->sock,
1025 (struct sockaddr *)&sock_in6, &err, 1);
1026 if (!rc) {
1027 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1028 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
1029 } else {
1030 /* Pretend to be an ipv4 socket */
1031 sock_in.sin_family = AF_INET;
1032 sock_in.sin_port = sock_in6.sin6_port;
1033 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1034 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1035 }
1036 }
1037
1038 rc = conn->sock->ops->getname(conn->sock,
1039 (struct sockaddr *)&sock_in6, &err, 0);
1040 if (!rc) {
1041 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1042 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
1043 } else {
1044 /* Pretend to be an ipv4 socket */
1045 sock_in.sin_family = AF_INET;
1046 sock_in.sin_port = sock_in6.sin6_port;
1047 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1048 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1049 }
1050 }
1051 } else {
1052 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1053
1054 rc = conn->sock->ops->getname(conn->sock,
1055 (struct sockaddr *)&sock_in, &err, 1);
1056 if (!rc)
1057 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1058
1059 rc = conn->sock->ops->getname(conn->sock,
1060 (struct sockaddr *)&sock_in, &err, 0);
1061 if (!rc)
1062 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1063 }
1064
1065 return 0;
1066 }
1067
1068 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1069 {
1070 struct iscsi_login_req *login_req;
1071 u32 padding = 0, payload_length;
1072
1073 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1074 return -1;
1075
1076 login_req = (struct iscsi_login_req *)login->req;
1077 payload_length = ntoh24(login_req->dlength);
1078 padding = ((-payload_length) & 3);
1079
1080 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1081 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1082 login_req->flags, login_req->itt, login_req->cmdsn,
1083 login_req->exp_statsn, login_req->cid, payload_length);
1084 /*
1085 * Setup the initial iscsi_login values from the leading
1086 * login request PDU.
1087 */
1088 if (login->first_request) {
1089 login_req = (struct iscsi_login_req *)login->req;
1090 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1091 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1092 login->version_min = login_req->min_version;
1093 login->version_max = login_req->max_version;
1094 memcpy(login->isid, login_req->isid, 6);
1095 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1096 login->init_task_tag = login_req->itt;
1097 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1098 login->cid = be16_to_cpu(login_req->cid);
1099 login->tsih = be16_to_cpu(login_req->tsih);
1100 }
1101
1102 if (iscsi_target_check_login_request(conn, login) < 0)
1103 return -1;
1104
1105 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1106 if (iscsi_login_rx_data(conn, login->req_buf,
1107 payload_length + padding) < 0)
1108 return -1;
1109
1110 return 0;
1111 }
1112
1113 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1114 u32 length)
1115 {
1116 if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1117 return -1;
1118
1119 return 0;
1120 }
1121
1122 static int
1123 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1124 {
1125 int rc;
1126
1127 if (!t->owner) {
1128 conn->conn_transport = t;
1129 return 0;
1130 }
1131
1132 rc = try_module_get(t->owner);
1133 if (!rc) {
1134 pr_err("try_module_get() failed for %s\n", t->name);
1135 return -EINVAL;
1136 }
1137
1138 conn->conn_transport = t;
1139 return 0;
1140 }
1141
1142 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1143 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1144 {
1145 if (!new_sess)
1146 goto old_sess_out;
1147
1148 pr_err("iSCSI Login negotiation failed.\n");
1149 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1150 ISCSI_LOGIN_STATUS_INIT_ERR);
1151 if (!zero_tsih || !conn->sess)
1152 goto old_sess_out;
1153 if (conn->sess->se_sess)
1154 transport_free_session(conn->sess->se_sess);
1155 if (conn->sess->session_index != 0) {
1156 spin_lock_bh(&sess_idr_lock);
1157 idr_remove(&sess_idr, conn->sess->session_index);
1158 spin_unlock_bh(&sess_idr_lock);
1159 }
1160 kfree(conn->sess->sess_ops);
1161 kfree(conn->sess);
1162 conn->sess = NULL;
1163
1164 old_sess_out:
1165 iscsi_stop_login_thread_timer(np);
1166 /*
1167 * If login negotiation fails check if the Time2Retain timer
1168 * needs to be restarted.
1169 */
1170 if (!zero_tsih && conn->sess) {
1171 spin_lock_bh(&conn->sess->conn_lock);
1172 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1173 struct se_portal_group *se_tpg =
1174 &conn->tpg->tpg_se_tpg;
1175
1176 atomic_set(&conn->sess->session_continuation, 0);
1177 spin_unlock_bh(&conn->sess->conn_lock);
1178 spin_lock_bh(&se_tpg->session_lock);
1179 iscsit_start_time2retain_handler(conn->sess);
1180 spin_unlock_bh(&se_tpg->session_lock);
1181 } else
1182 spin_unlock_bh(&conn->sess->conn_lock);
1183 iscsit_dec_session_usage_count(conn->sess);
1184 }
1185
1186 ahash_request_free(conn->conn_tx_hash);
1187 if (conn->conn_rx_hash) {
1188 struct crypto_ahash *tfm;
1189
1190 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
1191 ahash_request_free(conn->conn_rx_hash);
1192 crypto_free_ahash(tfm);
1193 }
1194
1195 free_cpumask_var(conn->conn_cpumask);
1196
1197 kfree(conn->conn_ops);
1198
1199 if (conn->param_list) {
1200 iscsi_release_param_list(conn->param_list);
1201 conn->param_list = NULL;
1202 }
1203 iscsi_target_nego_release(conn);
1204
1205 if (conn->sock) {
1206 sock_release(conn->sock);
1207 conn->sock = NULL;
1208 }
1209
1210 if (conn->conn_transport->iscsit_wait_conn)
1211 conn->conn_transport->iscsit_wait_conn(conn);
1212
1213 if (conn->conn_transport->iscsit_free_conn)
1214 conn->conn_transport->iscsit_free_conn(conn);
1215
1216 iscsit_put_transport(conn->conn_transport);
1217 kfree(conn);
1218 }
1219
1220 static int __iscsi_target_login_thread(struct iscsi_np *np)
1221 {
1222 u8 *buffer, zero_tsih = 0;
1223 int ret = 0, rc;
1224 struct iscsi_conn *conn = NULL;
1225 struct iscsi_login *login;
1226 struct iscsi_portal_group *tpg = NULL;
1227 struct iscsi_login_req *pdu;
1228 struct iscsi_tpg_np *tpg_np;
1229 bool new_sess = false;
1230
1231 flush_signals(current);
1232
1233 spin_lock_bh(&np->np_thread_lock);
1234 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1235 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1236 complete(&np->np_restart_comp);
1237 } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1238 spin_unlock_bh(&np->np_thread_lock);
1239 goto exit;
1240 } else {
1241 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1242 }
1243 spin_unlock_bh(&np->np_thread_lock);
1244
1245 conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1246 if (!conn) {
1247 pr_err("Could not allocate memory for"
1248 " new connection\n");
1249 /* Get another socket */
1250 return 1;
1251 }
1252 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1253 conn->conn_state = TARG_CONN_STATE_FREE;
1254
1255 if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1256 kfree(conn);
1257 return 1;
1258 }
1259
1260 rc = np->np_transport->iscsit_accept_np(np, conn);
1261 if (rc == -ENOSYS) {
1262 complete(&np->np_restart_comp);
1263 iscsit_put_transport(conn->conn_transport);
1264 kfree(conn);
1265 conn = NULL;
1266 goto exit;
1267 } else if (rc < 0) {
1268 spin_lock_bh(&np->np_thread_lock);
1269 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1270 spin_unlock_bh(&np->np_thread_lock);
1271 complete(&np->np_restart_comp);
1272 iscsit_put_transport(conn->conn_transport);
1273 kfree(conn);
1274 conn = NULL;
1275 /* Get another socket */
1276 return 1;
1277 }
1278 spin_unlock_bh(&np->np_thread_lock);
1279 iscsit_put_transport(conn->conn_transport);
1280 kfree(conn);
1281 conn = NULL;
1282 goto out;
1283 }
1284 /*
1285 * Perform the remaining iSCSI connection initialization items..
1286 */
1287 login = iscsi_login_init_conn(conn);
1288 if (!login) {
1289 goto new_sess_out;
1290 }
1291
1292 iscsi_start_login_thread_timer(np);
1293
1294 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1295 conn->conn_state = TARG_CONN_STATE_XPT_UP;
1296 /*
1297 * This will process the first login request + payload..
1298 */
1299 rc = np->np_transport->iscsit_get_login_rx(conn, login);
1300 if (rc == 1)
1301 return 1;
1302 else if (rc < 0)
1303 goto new_sess_out;
1304
1305 buffer = &login->req[0];
1306 pdu = (struct iscsi_login_req *)buffer;
1307 /*
1308 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1309 * when Status-Class != 0.
1310 */
1311 conn->login_itt = pdu->itt;
1312
1313 spin_lock_bh(&np->np_thread_lock);
1314 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1315 spin_unlock_bh(&np->np_thread_lock);
1316 pr_err("iSCSI Network Portal on %pISpc currently not"
1317 " active.\n", &np->np_sockaddr);
1318 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1319 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1320 goto new_sess_out;
1321 }
1322 spin_unlock_bh(&np->np_thread_lock);
1323
1324 conn->network_transport = np->np_network_transport;
1325
1326 pr_debug("Received iSCSI login request from %pISpc on %s Network"
1327 " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name,
1328 &conn->local_sockaddr);
1329
1330 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1331 conn->conn_state = TARG_CONN_STATE_IN_LOGIN;
1332
1333 if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1334 pdu->min_version) < 0)
1335 goto new_sess_out;
1336
1337 zero_tsih = (pdu->tsih == 0x0000);
1338 if (zero_tsih) {
1339 /*
1340 * This is the leading connection of a new session.
1341 * We wait until after authentication to check for
1342 * session reinstatement.
1343 */
1344 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1345 goto new_sess_out;
1346 } else {
1347 /*
1348 * Add a new connection to an existing session.
1349 * We check for a non-existant session in
1350 * iscsi_login_non_zero_tsih_s2() below based
1351 * on ISID/TSIH, but wait until after authentication
1352 * to check for connection reinstatement, etc.
1353 */
1354 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1355 goto new_sess_out;
1356 }
1357 /*
1358 * SessionType: Discovery
1359 *
1360 * Locates Default Portal
1361 *
1362 * SessionType: Normal
1363 *
1364 * Locates Target Portal from NP -> Target IQN
1365 */
1366 rc = iscsi_target_locate_portal(np, conn, login);
1367 if (rc < 0) {
1368 tpg = conn->tpg;
1369 goto new_sess_out;
1370 }
1371 login->zero_tsih = zero_tsih;
1372
1373 conn->sess->se_sess->sup_prot_ops =
1374 conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1375
1376 tpg = conn->tpg;
1377 if (!tpg) {
1378 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1379 goto new_sess_out;
1380 }
1381
1382 if (zero_tsih) {
1383 if (iscsi_login_zero_tsih_s2(conn) < 0)
1384 goto new_sess_out;
1385 } else {
1386 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1387 goto old_sess_out;
1388 }
1389
1390 ret = iscsi_target_start_negotiation(login, conn);
1391 if (ret < 0)
1392 goto new_sess_out;
1393
1394 iscsi_stop_login_thread_timer(np);
1395
1396 if (ret == 1) {
1397 tpg_np = conn->tpg_np;
1398
1399 iscsi_post_login_handler(np, conn, zero_tsih);
1400 iscsit_deaccess_np(np, tpg, tpg_np);
1401 }
1402
1403 tpg = NULL;
1404 tpg_np = NULL;
1405 /* Get another socket */
1406 return 1;
1407
1408 new_sess_out:
1409 new_sess = true;
1410 old_sess_out:
1411 tpg_np = conn->tpg_np;
1412 iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1413 new_sess = false;
1414
1415 if (tpg) {
1416 iscsit_deaccess_np(np, tpg, tpg_np);
1417 tpg = NULL;
1418 tpg_np = NULL;
1419 }
1420
1421 out:
1422 return 1;
1423
1424 exit:
1425 iscsi_stop_login_thread_timer(np);
1426 spin_lock_bh(&np->np_thread_lock);
1427 np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1428 spin_unlock_bh(&np->np_thread_lock);
1429
1430 return 0;
1431 }
1432
1433 int iscsi_target_login_thread(void *arg)
1434 {
1435 struct iscsi_np *np = arg;
1436 int ret;
1437
1438 allow_signal(SIGINT);
1439
1440 while (1) {
1441 ret = __iscsi_target_login_thread(np);
1442 /*
1443 * We break and exit here unless another sock_accept() call
1444 * is expected.
1445 */
1446 if (ret != 1)
1447 break;
1448 }
1449
1450 return 0;
1451 }
Linux with added FPC-III support