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target/iscsi: Remove macros that contain typecasts
[deliverable/linux.git] / drivers / target / iscsi / iscsi_target_login.c
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 "iscsi_target_core.h"
28 #include "iscsi_target_tq.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_stat.h"
35 #include "iscsi_target_tpg.h"
36 #include "iscsi_target_util.h"
37 #include "iscsi_target.h"
38 #include "iscsi_target_parameters.h"
39
40 #include <target/iscsi/iscsi_transport.h>
41
42 static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
43 {
44 struct iscsi_login *login;
45
46 login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
47 if (!login) {
48 pr_err("Unable to allocate memory for struct iscsi_login.\n");
49 return NULL;
50 }
51 conn->login = login;
52 login->conn = conn;
53 login->first_request = 1;
54
55 login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
56 if (!login->req_buf) {
57 pr_err("Unable to allocate memory for response buffer.\n");
58 goto out_login;
59 }
60
61 login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
62 if (!login->rsp_buf) {
63 pr_err("Unable to allocate memory for request buffer.\n");
64 goto out_req_buf;
65 }
66
67 conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
68 if (!conn->conn_ops) {
69 pr_err("Unable to allocate memory for"
70 " struct iscsi_conn_ops.\n");
71 goto out_rsp_buf;
72 }
73
74 init_waitqueue_head(&conn->queues_wq);
75 INIT_LIST_HEAD(&conn->conn_list);
76 INIT_LIST_HEAD(&conn->conn_cmd_list);
77 INIT_LIST_HEAD(&conn->immed_queue_list);
78 INIT_LIST_HEAD(&conn->response_queue_list);
79 init_completion(&conn->conn_post_wait_comp);
80 init_completion(&conn->conn_wait_comp);
81 init_completion(&conn->conn_wait_rcfr_comp);
82 init_completion(&conn->conn_waiting_on_uc_comp);
83 init_completion(&conn->conn_logout_comp);
84 init_completion(&conn->rx_half_close_comp);
85 init_completion(&conn->tx_half_close_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 /*
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
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
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
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
252 /*
253 * This is the leading connection of a new session,
254 * or session reinstatement.
255 */
256 static int iscsi_login_zero_tsih_s1(
257 struct iscsi_conn *conn,
258 unsigned char *buf)
259 {
260 struct iscsi_session *sess = NULL;
261 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
262 int ret;
263
264 sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
265 if (!sess) {
266 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
267 ISCSI_LOGIN_STATUS_NO_RESOURCES);
268 pr_err("Could not allocate memory for session\n");
269 return -ENOMEM;
270 }
271
272 iscsi_login_set_conn_values(sess, conn, pdu->cid);
273 sess->init_task_tag = pdu->itt;
274 memcpy(&sess->isid, pdu->isid, 6);
275 sess->exp_cmd_sn = be32_to_cpu(pdu->cmdsn);
276 INIT_LIST_HEAD(&sess->sess_conn_list);
277 INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
278 INIT_LIST_HEAD(&sess->cr_active_list);
279 INIT_LIST_HEAD(&sess->cr_inactive_list);
280 init_completion(&sess->async_msg_comp);
281 init_completion(&sess->reinstatement_comp);
282 init_completion(&sess->session_wait_comp);
283 init_completion(&sess->session_waiting_on_uc_comp);
284 mutex_init(&sess->cmdsn_mutex);
285 spin_lock_init(&sess->conn_lock);
286 spin_lock_init(&sess->cr_a_lock);
287 spin_lock_init(&sess->cr_i_lock);
288 spin_lock_init(&sess->session_usage_lock);
289 spin_lock_init(&sess->ttt_lock);
290
291 idr_preload(GFP_KERNEL);
292 spin_lock_bh(&sess_idr_lock);
293 ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
294 if (ret >= 0)
295 sess->session_index = ret;
296 spin_unlock_bh(&sess_idr_lock);
297 idr_preload_end();
298
299 if (ret < 0) {
300 pr_err("idr_alloc() for sess_idr failed\n");
301 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
302 ISCSI_LOGIN_STATUS_NO_RESOURCES);
303 kfree(sess);
304 return -ENOMEM;
305 }
306
307 sess->creation_time = get_jiffies_64();
308 spin_lock_init(&sess->session_stats_lock);
309 /*
310 * The FFP CmdSN window values will be allocated from the TPG's
311 * Initiator Node's ACL once the login has been successfully completed.
312 */
313 sess->max_cmd_sn = be32_to_cpu(pdu->cmdsn);
314
315 sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
316 if (!sess->sess_ops) {
317 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
318 ISCSI_LOGIN_STATUS_NO_RESOURCES);
319 pr_err("Unable to allocate memory for"
320 " struct iscsi_sess_ops.\n");
321 kfree(sess);
322 return -ENOMEM;
323 }
324
325 sess->se_sess = transport_init_session();
326 if (IS_ERR(sess->se_sess)) {
327 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
328 ISCSI_LOGIN_STATUS_NO_RESOURCES);
329 kfree(sess);
330 return -ENOMEM;
331 }
332
333 return 0;
334 }
335
336 static int iscsi_login_zero_tsih_s2(
337 struct iscsi_conn *conn)
338 {
339 struct iscsi_node_attrib *na;
340 struct iscsi_session *sess = conn->sess;
341 unsigned char buf[32];
342 bool iser = false;
343
344 sess->tpg = conn->tpg;
345
346 /*
347 * Assign a new TPG Session Handle. Note this is protected with
348 * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
349 */
350 sess->tsih = ++sess->tpg->ntsih;
351 if (!sess->tsih)
352 sess->tsih = ++sess->tpg->ntsih;
353
354 /*
355 * Create the default params from user defined values..
356 */
357 if (iscsi_copy_param_list(&conn->param_list,
358 conn->tpg->param_list, 1) < 0) {
359 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
360 ISCSI_LOGIN_STATUS_NO_RESOURCES);
361 return -1;
362 }
363
364 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
365 iser = true;
366
367 iscsi_set_keys_to_negotiate(conn->param_list, iser);
368
369 if (sess->sess_ops->SessionType)
370 return iscsi_set_keys_irrelevant_for_discovery(
371 conn->param_list);
372
373 na = iscsit_tpg_get_node_attrib(sess);
374
375 /*
376 * Need to send TargetPortalGroupTag back in first login response
377 * on any iSCSI connection where the Initiator provides TargetName.
378 * See 5.3.1. Login Phase Start
379 *
380 * In our case, we have already located the struct iscsi_tiqn at this point.
381 */
382 memset(buf, 0, 32);
383 sprintf(buf, "TargetPortalGroupTag=%hu", sess->tpg->tpgt);
384 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
385 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
386 ISCSI_LOGIN_STATUS_NO_RESOURCES);
387 return -1;
388 }
389
390 /*
391 * Workaround for Initiators that have broken connection recovery logic.
392 *
393 * "We would really like to get rid of this." Linux-iSCSI.org team
394 */
395 memset(buf, 0, 32);
396 sprintf(buf, "ErrorRecoveryLevel=%d", na->default_erl);
397 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
398 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
399 ISCSI_LOGIN_STATUS_NO_RESOURCES);
400 return -1;
401 }
402
403 if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
404 return -1;
405 /*
406 * Set RDMAExtensions=Yes by default for iSER enabled network portals
407 */
408 if (iser) {
409 struct iscsi_param *param;
410 unsigned long mrdsl, off;
411 int rc;
412
413 sprintf(buf, "RDMAExtensions=Yes");
414 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
415 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
416 ISCSI_LOGIN_STATUS_NO_RESOURCES);
417 return -1;
418 }
419 /*
420 * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
421 * Immediate Data + Unsolicitied Data-OUT if necessary..
422 */
423 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
424 conn->param_list);
425 if (!param) {
426 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
427 ISCSI_LOGIN_STATUS_NO_RESOURCES);
428 return -1;
429 }
430 rc = kstrtoul(param->value, 0, &mrdsl);
431 if (rc < 0) {
432 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
433 ISCSI_LOGIN_STATUS_NO_RESOURCES);
434 return -1;
435 }
436 off = mrdsl % PAGE_SIZE;
437 if (!off)
438 return 0;
439
440 if (mrdsl < PAGE_SIZE)
441 mrdsl = PAGE_SIZE;
442 else
443 mrdsl -= off;
444
445 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
446 " to PAGE_SIZE\n", mrdsl);
447
448 sprintf(buf, "MaxRecvDataSegmentLength=%lu\n", mrdsl);
449 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
450 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
451 ISCSI_LOGIN_STATUS_NO_RESOURCES);
452 return -1;
453 }
454 }
455
456 return 0;
457 }
458
459 /*
460 * Remove PSTATE_NEGOTIATE for the four FIM related keys.
461 * The Initiator node will be able to enable FIM by proposing them itself.
462 */
463 int iscsi_login_disable_FIM_keys(
464 struct iscsi_param_list *param_list,
465 struct iscsi_conn *conn)
466 {
467 struct iscsi_param *param;
468
469 param = iscsi_find_param_from_key("OFMarker", param_list);
470 if (!param) {
471 pr_err("iscsi_find_param_from_key() for"
472 " OFMarker failed\n");
473 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
474 ISCSI_LOGIN_STATUS_NO_RESOURCES);
475 return -1;
476 }
477 param->state &= ~PSTATE_NEGOTIATE;
478
479 param = iscsi_find_param_from_key("OFMarkInt", param_list);
480 if (!param) {
481 pr_err("iscsi_find_param_from_key() for"
482 " IFMarker failed\n");
483 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
484 ISCSI_LOGIN_STATUS_NO_RESOURCES);
485 return -1;
486 }
487 param->state &= ~PSTATE_NEGOTIATE;
488
489 param = iscsi_find_param_from_key("IFMarker", param_list);
490 if (!param) {
491 pr_err("iscsi_find_param_from_key() for"
492 " IFMarker failed\n");
493 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
494 ISCSI_LOGIN_STATUS_NO_RESOURCES);
495 return -1;
496 }
497 param->state &= ~PSTATE_NEGOTIATE;
498
499 param = iscsi_find_param_from_key("IFMarkInt", param_list);
500 if (!param) {
501 pr_err("iscsi_find_param_from_key() for"
502 " IFMarker failed\n");
503 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
504 ISCSI_LOGIN_STATUS_NO_RESOURCES);
505 return -1;
506 }
507 param->state &= ~PSTATE_NEGOTIATE;
508
509 return 0;
510 }
511
512 static int iscsi_login_non_zero_tsih_s1(
513 struct iscsi_conn *conn,
514 unsigned char *buf)
515 {
516 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
517
518 iscsi_login_set_conn_values(NULL, conn, pdu->cid);
519 return 0;
520 }
521
522 /*
523 * Add a new connection to an existing session.
524 */
525 static int iscsi_login_non_zero_tsih_s2(
526 struct iscsi_conn *conn,
527 unsigned char *buf)
528 {
529 struct iscsi_portal_group *tpg = conn->tpg;
530 struct iscsi_session *sess = NULL, *sess_p = NULL;
531 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
532 struct se_session *se_sess, *se_sess_tmp;
533 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
534 bool iser = false;
535
536 spin_lock_bh(&se_tpg->session_lock);
537 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
538 sess_list) {
539
540 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
541 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
542 atomic_read(&sess_p->session_logout) ||
543 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
544 continue;
545 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
546 (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
547 iscsit_inc_session_usage_count(sess_p);
548 iscsit_stop_time2retain_timer(sess_p);
549 sess = sess_p;
550 break;
551 }
552 }
553 spin_unlock_bh(&se_tpg->session_lock);
554
555 /*
556 * If the Time2Retain handler has expired, the session is already gone.
557 */
558 if (!sess) {
559 pr_err("Initiator attempting to add a connection to"
560 " a non-existent session, rejecting iSCSI Login.\n");
561 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
562 ISCSI_LOGIN_STATUS_NO_SESSION);
563 return -1;
564 }
565
566 /*
567 * Stop the Time2Retain timer if this is a failed session, we restart
568 * the timer if the login is not successful.
569 */
570 spin_lock_bh(&sess->conn_lock);
571 if (sess->session_state == TARG_SESS_STATE_FAILED)
572 atomic_set(&sess->session_continuation, 1);
573 spin_unlock_bh(&sess->conn_lock);
574
575 iscsi_login_set_conn_values(sess, conn, pdu->cid);
576
577 if (iscsi_copy_param_list(&conn->param_list,
578 conn->tpg->param_list, 0) < 0) {
579 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
580 ISCSI_LOGIN_STATUS_NO_RESOURCES);
581 return -1;
582 }
583
584 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
585 iser = true;
586
587 iscsi_set_keys_to_negotiate(conn->param_list, iser);
588 /*
589 * Need to send TargetPortalGroupTag back in first login response
590 * on any iSCSI connection where the Initiator provides TargetName.
591 * See 5.3.1. Login Phase Start
592 *
593 * In our case, we have already located the struct iscsi_tiqn at this point.
594 */
595 memset(buf, 0, 32);
596 sprintf(buf, "TargetPortalGroupTag=%hu", sess->tpg->tpgt);
597 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
598 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
599 ISCSI_LOGIN_STATUS_NO_RESOURCES);
600 return -1;
601 }
602
603 return iscsi_login_disable_FIM_keys(conn->param_list, conn);
604 }
605
606 int iscsi_login_post_auth_non_zero_tsih(
607 struct iscsi_conn *conn,
608 u16 cid,
609 u32 exp_statsn)
610 {
611 struct iscsi_conn *conn_ptr = NULL;
612 struct iscsi_conn_recovery *cr = NULL;
613 struct iscsi_session *sess = conn->sess;
614
615 /*
616 * By following item 5 in the login table, if we have found
617 * an existing ISID and a valid/existing TSIH and an existing
618 * CID we do connection reinstatement. Currently we dont not
619 * support it so we send back an non-zero status class to the
620 * initiator and release the new connection.
621 */
622 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
623 if (conn_ptr) {
624 pr_err("Connection exists with CID %hu for %s,"
625 " performing connection reinstatement.\n",
626 conn_ptr->cid, sess->sess_ops->InitiatorName);
627
628 iscsit_connection_reinstatement_rcfr(conn_ptr);
629 iscsit_dec_conn_usage_count(conn_ptr);
630 }
631
632 /*
633 * Check for any connection recovery entires containing CID.
634 * We use the original ExpStatSN sent in the first login request
635 * to acknowledge commands for the failed connection.
636 *
637 * Also note that an explict logout may have already been sent,
638 * but the response may not be sent due to additional connection
639 * loss.
640 */
641 if (sess->sess_ops->ErrorRecoveryLevel == 2) {
642 cr = iscsit_get_inactive_connection_recovery_entry(
643 sess, cid);
644 if (cr) {
645 pr_debug("Performing implicit logout"
646 " for connection recovery on CID: %hu\n",
647 conn->cid);
648 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
649 }
650 }
651
652 /*
653 * Else we follow item 4 from the login table in that we have
654 * found an existing ISID and a valid/existing TSIH and a new
655 * CID we go ahead and continue to add a new connection to the
656 * session.
657 */
658 pr_debug("Adding CID %hu to existing session for %s.\n",
659 cid, sess->sess_ops->InitiatorName);
660
661 if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
662 pr_err("Adding additional connection to this session"
663 " would exceed MaxConnections %d, login failed.\n",
664 sess->sess_ops->MaxConnections);
665 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
666 ISCSI_LOGIN_STATUS_ISID_ERROR);
667 return -1;
668 }
669
670 return 0;
671 }
672
673 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
674 {
675 struct iscsi_session *sess = conn->sess;
676 /*
677 * FIXME: Unsolicitied NopIN support for ISER
678 */
679 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
680 return;
681
682 if (!sess->sess_ops->SessionType)
683 iscsit_start_nopin_timer(conn);
684 }
685
686 int iscsi_post_login_handler(
687 struct iscsi_np *np,
688 struct iscsi_conn *conn,
689 u8 zero_tsih)
690 {
691 int stop_timer = 0;
692 struct iscsi_session *sess = conn->sess;
693 struct se_session *se_sess = sess->se_sess;
694 struct iscsi_portal_group *tpg = sess->tpg;
695 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
696 struct iscsi_thread_set *ts;
697
698 iscsit_inc_conn_usage_count(conn);
699
700 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
701 ISCSI_LOGIN_STATUS_ACCEPT);
702
703 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
704 conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
705
706 iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
707 iscsit_set_sync_and_steering_values(conn);
708 /*
709 * SCSI Initiator -> SCSI Target Port Mapping
710 */
711 ts = iscsi_get_thread_set();
712 if (!zero_tsih) {
713 iscsi_set_session_parameters(sess->sess_ops,
714 conn->param_list, 0);
715 iscsi_release_param_list(conn->param_list);
716 conn->param_list = NULL;
717
718 spin_lock_bh(&sess->conn_lock);
719 atomic_set(&sess->session_continuation, 0);
720 if (sess->session_state == TARG_SESS_STATE_FAILED) {
721 pr_debug("Moving to"
722 " TARG_SESS_STATE_LOGGED_IN.\n");
723 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
724 stop_timer = 1;
725 }
726
727 pr_debug("iSCSI Login successful on CID: %hu from %s to"
728 " %s:%hu,%hu\n", conn->cid, conn->login_ip,
729 conn->local_ip, conn->local_port, tpg->tpgt);
730
731 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
732 atomic_inc(&sess->nconn);
733 pr_debug("Incremented iSCSI Connection count to %hu"
734 " from node: %s\n", atomic_read(&sess->nconn),
735 sess->sess_ops->InitiatorName);
736 spin_unlock_bh(&sess->conn_lock);
737
738 iscsi_post_login_start_timers(conn);
739
740 iscsi_activate_thread_set(conn, ts);
741 /*
742 * Determine CPU mask to ensure connection's RX and TX kthreads
743 * are scheduled on the same CPU.
744 */
745 iscsit_thread_get_cpumask(conn);
746 conn->conn_rx_reset_cpumask = 1;
747 conn->conn_tx_reset_cpumask = 1;
748
749 iscsit_dec_conn_usage_count(conn);
750 if (stop_timer) {
751 spin_lock_bh(&se_tpg->session_lock);
752 iscsit_stop_time2retain_timer(sess);
753 spin_unlock_bh(&se_tpg->session_lock);
754 }
755 iscsit_dec_session_usage_count(sess);
756 return 0;
757 }
758
759 iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
760 iscsi_release_param_list(conn->param_list);
761 conn->param_list = NULL;
762
763 iscsit_determine_maxcmdsn(sess);
764
765 spin_lock_bh(&se_tpg->session_lock);
766 __transport_register_session(&sess->tpg->tpg_se_tpg,
767 se_sess->se_node_acl, se_sess, sess);
768 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
769 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
770
771 pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
772 conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
773 tpg->tpgt);
774
775 spin_lock_bh(&sess->conn_lock);
776 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
777 atomic_inc(&sess->nconn);
778 pr_debug("Incremented iSCSI Connection count to %hu from node:"
779 " %s\n", atomic_read(&sess->nconn),
780 sess->sess_ops->InitiatorName);
781 spin_unlock_bh(&sess->conn_lock);
782
783 sess->sid = tpg->sid++;
784 if (!sess->sid)
785 sess->sid = tpg->sid++;
786 pr_debug("Established iSCSI session from node: %s\n",
787 sess->sess_ops->InitiatorName);
788
789 tpg->nsessions++;
790 if (tpg->tpg_tiqn)
791 tpg->tpg_tiqn->tiqn_nsessions++;
792
793 pr_debug("Incremented number of active iSCSI sessions to %u on"
794 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
795 spin_unlock_bh(&se_tpg->session_lock);
796
797 iscsi_post_login_start_timers(conn);
798 iscsi_activate_thread_set(conn, ts);
799 /*
800 * Determine CPU mask to ensure connection's RX and TX kthreads
801 * are scheduled on the same CPU.
802 */
803 iscsit_thread_get_cpumask(conn);
804 conn->conn_rx_reset_cpumask = 1;
805 conn->conn_tx_reset_cpumask = 1;
806
807 iscsit_dec_conn_usage_count(conn);
808
809 return 0;
810 }
811
812 static void iscsi_handle_login_thread_timeout(unsigned long data)
813 {
814 struct iscsi_np *np = (struct iscsi_np *) data;
815
816 spin_lock_bh(&np->np_thread_lock);
817 pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
818 np->np_ip, np->np_port);
819
820 if (np->np_login_timer_flags & ISCSI_TF_STOP) {
821 spin_unlock_bh(&np->np_thread_lock);
822 return;
823 }
824
825 if (np->np_thread)
826 send_sig(SIGINT, np->np_thread, 1);
827
828 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
829 spin_unlock_bh(&np->np_thread_lock);
830 }
831
832 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
833 {
834 /*
835 * This used the TA_LOGIN_TIMEOUT constant because at this
836 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
837 */
838 spin_lock_bh(&np->np_thread_lock);
839 init_timer(&np->np_login_timer);
840 np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
841 np->np_login_timer.data = (unsigned long)np;
842 np->np_login_timer.function = iscsi_handle_login_thread_timeout;
843 np->np_login_timer_flags &= ~ISCSI_TF_STOP;
844 np->np_login_timer_flags |= ISCSI_TF_RUNNING;
845 add_timer(&np->np_login_timer);
846
847 pr_debug("Added timeout timer to iSCSI login request for"
848 " %u seconds.\n", TA_LOGIN_TIMEOUT);
849 spin_unlock_bh(&np->np_thread_lock);
850 }
851
852 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
853 {
854 spin_lock_bh(&np->np_thread_lock);
855 if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
856 spin_unlock_bh(&np->np_thread_lock);
857 return;
858 }
859 np->np_login_timer_flags |= ISCSI_TF_STOP;
860 spin_unlock_bh(&np->np_thread_lock);
861
862 del_timer_sync(&np->np_login_timer);
863
864 spin_lock_bh(&np->np_thread_lock);
865 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
866 spin_unlock_bh(&np->np_thread_lock);
867 }
868
869 int iscsit_setup_np(
870 struct iscsi_np *np,
871 struct __kernel_sockaddr_storage *sockaddr)
872 {
873 struct socket *sock = NULL;
874 int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
875
876 switch (np->np_network_transport) {
877 case ISCSI_TCP:
878 np->np_ip_proto = IPPROTO_TCP;
879 np->np_sock_type = SOCK_STREAM;
880 break;
881 case ISCSI_SCTP_TCP:
882 np->np_ip_proto = IPPROTO_SCTP;
883 np->np_sock_type = SOCK_STREAM;
884 break;
885 case ISCSI_SCTP_UDP:
886 np->np_ip_proto = IPPROTO_SCTP;
887 np->np_sock_type = SOCK_SEQPACKET;
888 break;
889 default:
890 pr_err("Unsupported network_transport: %d\n",
891 np->np_network_transport);
892 return -EINVAL;
893 }
894
895 np->np_ip_proto = IPPROTO_TCP;
896 np->np_sock_type = SOCK_STREAM;
897
898 ret = sock_create(sockaddr->ss_family, np->np_sock_type,
899 np->np_ip_proto, &sock);
900 if (ret < 0) {
901 pr_err("sock_create() failed.\n");
902 return ret;
903 }
904 np->np_socket = sock;
905 /*
906 * Setup the np->np_sockaddr from the passed sockaddr setup
907 * in iscsi_target_configfs.c code..
908 */
909 memcpy(&np->np_sockaddr, sockaddr,
910 sizeof(struct __kernel_sockaddr_storage));
911
912 if (sockaddr->ss_family == AF_INET6)
913 len = sizeof(struct sockaddr_in6);
914 else
915 len = sizeof(struct sockaddr_in);
916 /*
917 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
918 */
919 /* FIXME: Someone please explain why this is endian-safe */
920 opt = 1;
921 if (np->np_network_transport == ISCSI_TCP) {
922 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
923 (char *)&opt, sizeof(opt));
924 if (ret < 0) {
925 pr_err("kernel_setsockopt() for TCP_NODELAY"
926 " failed: %d\n", ret);
927 goto fail;
928 }
929 }
930
931 /* FIXME: Someone please explain why this is endian-safe */
932 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
933 (char *)&opt, sizeof(opt));
934 if (ret < 0) {
935 pr_err("kernel_setsockopt() for SO_REUSEADDR"
936 " failed\n");
937 goto fail;
938 }
939
940 ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
941 (char *)&opt, sizeof(opt));
942 if (ret < 0) {
943 pr_err("kernel_setsockopt() for IP_FREEBIND"
944 " failed\n");
945 goto fail;
946 }
947
948 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
949 if (ret < 0) {
950 pr_err("kernel_bind() failed: %d\n", ret);
951 goto fail;
952 }
953
954 ret = kernel_listen(sock, backlog);
955 if (ret != 0) {
956 pr_err("kernel_listen() failed: %d\n", ret);
957 goto fail;
958 }
959
960 return 0;
961 fail:
962 np->np_socket = NULL;
963 if (sock)
964 sock_release(sock);
965 return ret;
966 }
967
968 int iscsi_target_setup_login_socket(
969 struct iscsi_np *np,
970 struct __kernel_sockaddr_storage *sockaddr)
971 {
972 struct iscsit_transport *t;
973 int rc;
974
975 t = iscsit_get_transport(np->np_network_transport);
976 if (!t)
977 return -EINVAL;
978
979 rc = t->iscsit_setup_np(np, sockaddr);
980 if (rc < 0) {
981 iscsit_put_transport(t);
982 return rc;
983 }
984
985 np->np_transport = t;
986 return 0;
987 }
988
989 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
990 {
991 struct socket *new_sock, *sock = np->np_socket;
992 struct sockaddr_in sock_in;
993 struct sockaddr_in6 sock_in6;
994 int rc, err;
995
996 rc = kernel_accept(sock, &new_sock, 0);
997 if (rc < 0)
998 return rc;
999
1000 conn->sock = new_sock;
1001 conn->login_family = np->np_sockaddr.ss_family;
1002
1003 if (np->np_sockaddr.ss_family == AF_INET6) {
1004 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1005
1006 rc = conn->sock->ops->getname(conn->sock,
1007 (struct sockaddr *)&sock_in6, &err, 1);
1008 if (!rc) {
1009 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1010 snprintf(conn->login_ip, sizeof(conn->login_ip), "[%pI6c]",
1011 &sock_in6.sin6_addr.in6_u);
1012 else
1013 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI4",
1014 &sock_in6.sin6_addr.s6_addr32[3]);
1015 conn->login_port = ntohs(sock_in6.sin6_port);
1016 }
1017
1018 rc = conn->sock->ops->getname(conn->sock,
1019 (struct sockaddr *)&sock_in6, &err, 0);
1020 if (!rc) {
1021 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1022 snprintf(conn->local_ip, sizeof(conn->local_ip), "[%pI6c]",
1023 &sock_in6.sin6_addr.in6_u);
1024 else
1025 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI4",
1026 &sock_in6.sin6_addr.s6_addr32[3]);
1027 conn->local_port = ntohs(sock_in6.sin6_port);
1028 }
1029 } else {
1030 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1031
1032 rc = conn->sock->ops->getname(conn->sock,
1033 (struct sockaddr *)&sock_in, &err, 1);
1034 if (!rc) {
1035 sprintf(conn->login_ip, "%pI4",
1036 &sock_in.sin_addr.s_addr);
1037 conn->login_port = ntohs(sock_in.sin_port);
1038 }
1039
1040 rc = conn->sock->ops->getname(conn->sock,
1041 (struct sockaddr *)&sock_in, &err, 0);
1042 if (!rc) {
1043 sprintf(conn->local_ip, "%pI4",
1044 &sock_in.sin_addr.s_addr);
1045 conn->local_port = ntohs(sock_in.sin_port);
1046 }
1047 }
1048
1049 return 0;
1050 }
1051
1052 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1053 {
1054 struct iscsi_login_req *login_req;
1055 u32 padding = 0, payload_length;
1056
1057 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1058 return -1;
1059
1060 login_req = (struct iscsi_login_req *)login->req;
1061 payload_length = ntoh24(login_req->dlength);
1062 padding = ((-payload_length) & 3);
1063
1064 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1065 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1066 login_req->flags, login_req->itt, login_req->cmdsn,
1067 login_req->exp_statsn, login_req->cid, payload_length);
1068 /*
1069 * Setup the initial iscsi_login values from the leading
1070 * login request PDU.
1071 */
1072 if (login->first_request) {
1073 login_req = (struct iscsi_login_req *)login->req;
1074 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1075 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1076 login->version_min = login_req->min_version;
1077 login->version_max = login_req->max_version;
1078 memcpy(login->isid, login_req->isid, 6);
1079 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1080 login->init_task_tag = login_req->itt;
1081 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1082 login->cid = be16_to_cpu(login_req->cid);
1083 login->tsih = be16_to_cpu(login_req->tsih);
1084 }
1085
1086 if (iscsi_target_check_login_request(conn, login) < 0)
1087 return -1;
1088
1089 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1090 if (iscsi_login_rx_data(conn, login->req_buf,
1091 payload_length + padding) < 0)
1092 return -1;
1093
1094 return 0;
1095 }
1096
1097 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1098 u32 length)
1099 {
1100 if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1101 return -1;
1102
1103 return 0;
1104 }
1105
1106 static int
1107 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1108 {
1109 int rc;
1110
1111 if (!t->owner) {
1112 conn->conn_transport = t;
1113 return 0;
1114 }
1115
1116 rc = try_module_get(t->owner);
1117 if (!rc) {
1118 pr_err("try_module_get() failed for %s\n", t->name);
1119 return -EINVAL;
1120 }
1121
1122 conn->conn_transport = t;
1123 return 0;
1124 }
1125
1126 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1127 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1128 {
1129 if (new_sess == false)
1130 goto old_sess_out;
1131
1132 pr_err("iSCSI Login negotiation failed.\n");
1133 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1134 ISCSI_LOGIN_STATUS_INIT_ERR);
1135 if (!zero_tsih || !conn->sess)
1136 goto old_sess_out;
1137 if (conn->sess->se_sess)
1138 transport_free_session(conn->sess->se_sess);
1139 if (conn->sess->session_index != 0) {
1140 spin_lock_bh(&sess_idr_lock);
1141 idr_remove(&sess_idr, conn->sess->session_index);
1142 spin_unlock_bh(&sess_idr_lock);
1143 }
1144 kfree(conn->sess->sess_ops);
1145 kfree(conn->sess);
1146
1147 old_sess_out:
1148 iscsi_stop_login_thread_timer(np);
1149 /*
1150 * If login negotiation fails check if the Time2Retain timer
1151 * needs to be restarted.
1152 */
1153 if (!zero_tsih && conn->sess) {
1154 spin_lock_bh(&conn->sess->conn_lock);
1155 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1156 struct se_portal_group *se_tpg =
1157 &conn->tpg->tpg_se_tpg;
1158
1159 atomic_set(&conn->sess->session_continuation, 0);
1160 spin_unlock_bh(&conn->sess->conn_lock);
1161 spin_lock_bh(&se_tpg->session_lock);
1162 iscsit_start_time2retain_handler(conn->sess);
1163 spin_unlock_bh(&se_tpg->session_lock);
1164 } else
1165 spin_unlock_bh(&conn->sess->conn_lock);
1166 iscsit_dec_session_usage_count(conn->sess);
1167 }
1168
1169 if (!IS_ERR(conn->conn_rx_hash.tfm))
1170 crypto_free_hash(conn->conn_rx_hash.tfm);
1171 if (!IS_ERR(conn->conn_tx_hash.tfm))
1172 crypto_free_hash(conn->conn_tx_hash.tfm);
1173
1174 if (conn->conn_cpumask)
1175 free_cpumask_var(conn->conn_cpumask);
1176
1177 kfree(conn->conn_ops);
1178
1179 if (conn->param_list) {
1180 iscsi_release_param_list(conn->param_list);
1181 conn->param_list = NULL;
1182 }
1183 iscsi_target_nego_release(conn);
1184
1185 if (conn->sock) {
1186 sock_release(conn->sock);
1187 conn->sock = NULL;
1188 }
1189
1190 if (conn->conn_transport->iscsit_free_conn)
1191 conn->conn_transport->iscsit_free_conn(conn);
1192
1193 iscsit_put_transport(conn->conn_transport);
1194 kfree(conn);
1195 }
1196
1197 static int __iscsi_target_login_thread(struct iscsi_np *np)
1198 {
1199 u8 *buffer, zero_tsih = 0;
1200 int ret = 0, rc, stop;
1201 struct iscsi_conn *conn = NULL;
1202 struct iscsi_login *login;
1203 struct iscsi_portal_group *tpg = NULL;
1204 struct iscsi_login_req *pdu;
1205 struct iscsi_tpg_np *tpg_np;
1206 bool new_sess = false;
1207
1208 flush_signals(current);
1209
1210 spin_lock_bh(&np->np_thread_lock);
1211 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1212 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1213 complete(&np->np_restart_comp);
1214 } else {
1215 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1216 }
1217 spin_unlock_bh(&np->np_thread_lock);
1218
1219 conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1220 if (!conn) {
1221 pr_err("Could not allocate memory for"
1222 " new connection\n");
1223 /* Get another socket */
1224 return 1;
1225 }
1226 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1227 conn->conn_state = TARG_CONN_STATE_FREE;
1228
1229 if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1230 kfree(conn);
1231 return 1;
1232 }
1233
1234 rc = np->np_transport->iscsit_accept_np(np, conn);
1235 if (rc == -ENOSYS) {
1236 complete(&np->np_restart_comp);
1237 iscsit_put_transport(conn->conn_transport);
1238 kfree(conn);
1239 conn = NULL;
1240 goto exit;
1241 } else if (rc < 0) {
1242 spin_lock_bh(&np->np_thread_lock);
1243 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1244 spin_unlock_bh(&np->np_thread_lock);
1245 complete(&np->np_restart_comp);
1246 iscsit_put_transport(conn->conn_transport);
1247 kfree(conn);
1248 conn = NULL;
1249 if (ret == -ENODEV)
1250 goto out;
1251 /* Get another socket */
1252 return 1;
1253 }
1254 spin_unlock_bh(&np->np_thread_lock);
1255 iscsit_put_transport(conn->conn_transport);
1256 kfree(conn);
1257 conn = NULL;
1258 goto out;
1259 }
1260 /*
1261 * Perform the remaining iSCSI connection initialization items..
1262 */
1263 login = iscsi_login_init_conn(conn);
1264 if (!login) {
1265 goto new_sess_out;
1266 }
1267
1268 iscsi_start_login_thread_timer(np);
1269
1270 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1271 conn->conn_state = TARG_CONN_STATE_XPT_UP;
1272 /*
1273 * This will process the first login request + payload..
1274 */
1275 rc = np->np_transport->iscsit_get_login_rx(conn, login);
1276 if (rc == 1)
1277 return 1;
1278 else if (rc < 0)
1279 goto new_sess_out;
1280
1281 buffer = &login->req[0];
1282 pdu = (struct iscsi_login_req *)buffer;
1283 /*
1284 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1285 * when Status-Class != 0.
1286 */
1287 conn->login_itt = pdu->itt;
1288
1289 spin_lock_bh(&np->np_thread_lock);
1290 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1291 spin_unlock_bh(&np->np_thread_lock);
1292 pr_err("iSCSI Network Portal on %s:%hu currently not"
1293 " active.\n", np->np_ip, np->np_port);
1294 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1295 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1296 goto new_sess_out;
1297 }
1298 spin_unlock_bh(&np->np_thread_lock);
1299
1300 conn->network_transport = np->np_network_transport;
1301
1302 pr_debug("Received iSCSI login request from %s on %s Network"
1303 " Portal %s:%hu\n", conn->login_ip, np->np_transport->name,
1304 conn->local_ip, conn->local_port);
1305
1306 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1307 conn->conn_state = TARG_CONN_STATE_IN_LOGIN;
1308
1309 if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1310 pdu->min_version) < 0)
1311 goto new_sess_out;
1312
1313 zero_tsih = (pdu->tsih == 0x0000);
1314 if (zero_tsih) {
1315 /*
1316 * This is the leading connection of a new session.
1317 * We wait until after authentication to check for
1318 * session reinstatement.
1319 */
1320 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1321 goto new_sess_out;
1322 } else {
1323 /*
1324 * Add a new connection to an existing session.
1325 * We check for a non-existant session in
1326 * iscsi_login_non_zero_tsih_s2() below based
1327 * on ISID/TSIH, but wait until after authentication
1328 * to check for connection reinstatement, etc.
1329 */
1330 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1331 goto new_sess_out;
1332 }
1333 /*
1334 * SessionType: Discovery
1335 *
1336 * Locates Default Portal
1337 *
1338 * SessionType: Normal
1339 *
1340 * Locates Target Portal from NP -> Target IQN
1341 */
1342 rc = iscsi_target_locate_portal(np, conn, login);
1343 if (rc < 0) {
1344 tpg = conn->tpg;
1345 goto new_sess_out;
1346 }
1347 login->zero_tsih = zero_tsih;
1348
1349 tpg = conn->tpg;
1350 if (!tpg) {
1351 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1352 goto new_sess_out;
1353 }
1354
1355 if (zero_tsih) {
1356 if (iscsi_login_zero_tsih_s2(conn) < 0)
1357 goto new_sess_out;
1358 } else {
1359 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1360 goto old_sess_out;
1361 }
1362
1363 ret = iscsi_target_start_negotiation(login, conn);
1364 if (ret < 0)
1365 goto new_sess_out;
1366
1367 if (!conn->sess) {
1368 pr_err("struct iscsi_conn session pointer is NULL!\n");
1369 goto new_sess_out;
1370 }
1371
1372 iscsi_stop_login_thread_timer(np);
1373
1374 if (signal_pending(current))
1375 goto new_sess_out;
1376
1377 if (ret == 1) {
1378 tpg_np = conn->tpg_np;
1379
1380 ret = iscsi_post_login_handler(np, conn, zero_tsih);
1381 if (ret < 0)
1382 goto new_sess_out;
1383
1384 iscsit_deaccess_np(np, tpg, tpg_np);
1385 }
1386
1387 tpg = NULL;
1388 tpg_np = NULL;
1389 /* Get another socket */
1390 return 1;
1391
1392 new_sess_out:
1393 new_sess = true;
1394 old_sess_out:
1395 tpg_np = conn->tpg_np;
1396 iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1397 new_sess = false;
1398
1399 if (tpg) {
1400 iscsit_deaccess_np(np, tpg, tpg_np);
1401 tpg = NULL;
1402 tpg_np = NULL;
1403 }
1404
1405 out:
1406 stop = kthread_should_stop();
1407 if (!stop && signal_pending(current)) {
1408 spin_lock_bh(&np->np_thread_lock);
1409 stop = (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN);
1410 spin_unlock_bh(&np->np_thread_lock);
1411 }
1412 /* Wait for another socket.. */
1413 if (!stop)
1414 return 1;
1415 exit:
1416 iscsi_stop_login_thread_timer(np);
1417 spin_lock_bh(&np->np_thread_lock);
1418 np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1419 np->np_thread = NULL;
1420 spin_unlock_bh(&np->np_thread_lock);
1421
1422 return 0;
1423 }
1424
1425 int iscsi_target_login_thread(void *arg)
1426 {
1427 struct iscsi_np *np = arg;
1428 int ret;
1429
1430 allow_signal(SIGINT);
1431
1432 while (!kthread_should_stop()) {
1433 ret = __iscsi_target_login_thread(np);
1434 /*
1435 * We break and exit here unless another sock_accept() call
1436 * is expected.
1437 */
1438 if (ret != 1)
1439 break;
1440 }
1441
1442 return 0;
1443 }
Linux kernel - Deliverables
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