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printf: Remove unused 'bprintf'
[drm/drm-misc.git] / drivers / target / iscsi / iscsi_target_login.c
blob90b870f234f03cd9033418387482a34bf9d4ede1
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3 * This file contains the login functions used by the iSCSI Target driver.
4 *
5 * (c) Copyright 2007-2013 Datera, Inc.
6 *
7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 *
9 ******************************************************************************/
10
11 #include <crypto/hash.h>
12 #include <linux/module.h>
13 #include <linux/string.h>
14 #include <linux/kthread.h>
15 #include <linux/sched/signal.h>
16 #include <linux/idr.h>
17 #include <linux/tcp.h> /* TCP_NODELAY */
18 #include <net/ip.h>
19 #include <net/ipv6.h> /* ipv6_addr_v4mapped() */
20 #include <scsi/iscsi_proto.h>
21 #include <target/target_core_base.h>
22 #include <target/target_core_fabric.h>
23
24 #include <target/iscsi/iscsi_target_core.h>
25 #include <target/iscsi/iscsi_target_stat.h>
26 #include "iscsi_target_device.h"
27 #include "iscsi_target_nego.h"
28 #include "iscsi_target_erl0.h"
29 #include "iscsi_target_erl2.h"
30 #include "iscsi_target_login.h"
31 #include "iscsi_target_tpg.h"
32 #include "iscsi_target_util.h"
33 #include "iscsi_target.h"
34 #include "iscsi_target_parameters.h"
35
36 #include <target/iscsi/iscsi_transport.h>
37
38 static struct iscsi_login *iscsi_login_init_conn(struct iscsit_conn *conn)
39 {
40 struct iscsi_login *login;
41
42 login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
43 if (!login) {
44 pr_err("Unable to allocate memory for struct iscsi_login.\n");
45 return NULL;
46 }
47 conn->login = login;
48 login->conn = conn;
49 login->first_request = 1;
50
51 login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
52 if (!login->req_buf) {
53 pr_err("Unable to allocate memory for response buffer.\n");
54 goto out_login;
55 }
56
57 login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
58 if (!login->rsp_buf) {
59 pr_err("Unable to allocate memory for request buffer.\n");
60 goto out_req_buf;
61 }
62
63 conn->conn_login = login;
64
65 return login;
66
67 out_req_buf:
68 kfree(login->req_buf);
69 out_login:
70 kfree(login);
71 return NULL;
72 }
73
74 /*
75 * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
76 * per struct iscsit_conn libcrypto contexts for crc32c and crc32-intel
77 */
78 int iscsi_login_setup_crypto(struct iscsit_conn *conn)
79 {
80 struct crypto_ahash *tfm;
81
82 /*
83 * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
84 * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
85 * to software 1x8 byte slicing from crc32c.ko
86 */
87 tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
88 if (IS_ERR(tfm)) {
89 pr_err("crypto_alloc_ahash() failed\n");
90 return -ENOMEM;
91 }
92
93 conn->conn_rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
94 if (!conn->conn_rx_hash) {
95 pr_err("ahash_request_alloc() failed for conn_rx_hash\n");
96 crypto_free_ahash(tfm);
97 return -ENOMEM;
98 }
99 ahash_request_set_callback(conn->conn_rx_hash, 0, NULL, NULL);
100
101 conn->conn_tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
102 if (!conn->conn_tx_hash) {
103 pr_err("ahash_request_alloc() failed for conn_tx_hash\n");
104 ahash_request_free(conn->conn_rx_hash);
105 conn->conn_rx_hash = NULL;
106 crypto_free_ahash(tfm);
107 return -ENOMEM;
108 }
109 ahash_request_set_callback(conn->conn_tx_hash, 0, NULL, NULL);
110
111 return 0;
112 }
113
114 static int iscsi_login_check_initiator_version(
115 struct iscsit_conn *conn,
116 u8 version_max,
117 u8 version_min)
118 {
119 if ((version_max != 0x00) || (version_min != 0x00)) {
120 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
121 " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
122 version_min, version_max);
123 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
124 ISCSI_LOGIN_STATUS_NO_VERSION);
125 return -1;
126 }
127
128 return 0;
129 }
130
131 int iscsi_check_for_session_reinstatement(struct iscsit_conn *conn)
132 {
133 int sessiontype;
134 struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
135 struct iscsi_portal_group *tpg = conn->tpg;
136 struct iscsit_session *sess = NULL, *sess_p = NULL;
137 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
138 struct se_session *se_sess, *se_sess_tmp;
139
140 initiatorname_param = iscsi_find_param_from_key(
141 INITIATORNAME, conn->param_list);
142 sessiontype_param = iscsi_find_param_from_key(
143 SESSIONTYPE, conn->param_list);
144 if (!initiatorname_param || !sessiontype_param) {
145 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
146 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
147 return -1;
148 }
149
150 sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
151
152 spin_lock_bh(&se_tpg->session_lock);
153 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
154 sess_list) {
155
156 sess_p = se_sess->fabric_sess_ptr;
157 spin_lock(&sess_p->conn_lock);
158 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
159 atomic_read(&sess_p->session_logout) ||
160 atomic_read(&sess_p->session_close) ||
161 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
162 spin_unlock(&sess_p->conn_lock);
163 continue;
164 }
165 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
166 (!strcmp(sess_p->sess_ops->InitiatorName,
167 initiatorname_param->value) &&
168 (sess_p->sess_ops->SessionType == sessiontype))) {
169 atomic_set(&sess_p->session_reinstatement, 1);
170 atomic_set(&sess_p->session_fall_back_to_erl0, 1);
171 atomic_set(&sess_p->session_close, 1);
172 spin_unlock(&sess_p->conn_lock);
173 iscsit_inc_session_usage_count(sess_p);
174 iscsit_stop_time2retain_timer(sess_p);
175 sess = sess_p;
176 break;
177 }
178 spin_unlock(&sess_p->conn_lock);
179 }
180 spin_unlock_bh(&se_tpg->session_lock);
181 /*
182 * If the Time2Retain handler has expired, the session is already gone.
183 */
184 if (!sess)
185 return 0;
186
187 pr_debug("%s iSCSI Session SID %u is still active for %s,"
188 " performing session reinstatement.\n", (sessiontype) ?
189 "Discovery" : "Normal", sess->sid,
190 sess->sess_ops->InitiatorName);
191
192 spin_lock_bh(&sess->conn_lock);
193 if (sess->session_state == TARG_SESS_STATE_FAILED) {
194 spin_unlock_bh(&sess->conn_lock);
195 iscsit_dec_session_usage_count(sess);
196 return 0;
197 }
198 spin_unlock_bh(&sess->conn_lock);
199
200 iscsit_stop_session(sess, 1, 1);
201 iscsit_dec_session_usage_count(sess);
202
203 return 0;
204 }
205
206 static int iscsi_login_set_conn_values(
207 struct iscsit_session *sess,
208 struct iscsit_conn *conn,
209 __be16 cid)
210 {
211 int ret;
212 conn->sess = sess;
213 conn->cid = be16_to_cpu(cid);
214 /*
215 * Generate a random Status sequence number (statsn) for the new
216 * iSCSI connection.
217 */
218 ret = get_random_bytes_wait(&conn->stat_sn, sizeof(u32));
219 if (unlikely(ret))
220 return ret;
221
222 mutex_lock(&auth_id_lock);
223 conn->auth_id = iscsit_global->auth_id++;
224 mutex_unlock(&auth_id_lock);
225 return 0;
226 }
227
228 __printf(2, 3) int iscsi_change_param_sprintf(
229 struct iscsit_conn *conn,
230 const char *fmt, ...)
231 {
232 va_list args;
233 unsigned char buf[64];
234
235 memset(buf, 0, sizeof buf);
236
237 va_start(args, fmt);
238 vsnprintf(buf, sizeof buf, fmt, args);
239 va_end(args);
240
241 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
242 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
243 ISCSI_LOGIN_STATUS_NO_RESOURCES);
244 return -1;
245 }
246
247 return 0;
248 }
249 EXPORT_SYMBOL(iscsi_change_param_sprintf);
250
251 /*
252 * This is the leading connection of a new session,
253 * or session reinstatement.
254 */
255 static int iscsi_login_zero_tsih_s1(
256 struct iscsit_conn *conn,
257 unsigned char *buf)
258 {
259 struct iscsit_session *sess = NULL;
260 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
261 int ret;
262
263 sess = kzalloc(sizeof(struct iscsit_session), GFP_KERNEL);
264 if (!sess) {
265 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
266 ISCSI_LOGIN_STATUS_NO_RESOURCES);
267 pr_err("Could not allocate memory for session\n");
268 return -ENOMEM;
269 }
270
271 if (iscsi_login_set_conn_values(sess, conn, pdu->cid))
272 goto free_sess;
273
274 sess->init_task_tag = pdu->itt;
275 memcpy(&sess->isid, pdu->isid, 6);
276 sess->exp_cmd_sn = be32_to_cpu(pdu->cmdsn);
277 INIT_LIST_HEAD(&sess->sess_conn_list);
278 INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
279 INIT_LIST_HEAD(&sess->cr_active_list);
280 INIT_LIST_HEAD(&sess->cr_inactive_list);
281 init_completion(&sess->async_msg_comp);
282 init_completion(&sess->reinstatement_comp);
283 init_completion(&sess->session_wait_comp);
284 init_completion(&sess->session_waiting_on_uc_comp);
285 mutex_init(&sess->cmdsn_mutex);
286 spin_lock_init(&sess->conn_lock);
287 spin_lock_init(&sess->cr_a_lock);
288 spin_lock_init(&sess->cr_i_lock);
289 spin_lock_init(&sess->session_usage_lock);
290 spin_lock_init(&sess->ttt_lock);
291
292 timer_setup(&sess->time2retain_timer,
293 iscsit_handle_time2retain_timeout, 0);
294
295 ret = ida_alloc(&sess_ida, GFP_KERNEL);
296 if (ret < 0) {
297 pr_err("Session ID allocation failed %d\n", ret);
298 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
299 ISCSI_LOGIN_STATUS_NO_RESOURCES);
300 goto free_sess;
301 }
302
303 sess->session_index = ret;
304 sess->creation_time = get_jiffies_64();
305 /*
306 * The FFP CmdSN window values will be allocated from the TPG's
307 * Initiator Node's ACL once the login has been successfully completed.
308 */
309 atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn));
310
311 sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
312 if (!sess->sess_ops) {
313 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
314 ISCSI_LOGIN_STATUS_NO_RESOURCES);
315 pr_err("Unable to allocate memory for"
316 " struct iscsi_sess_ops.\n");
317 goto free_id;
318 }
319
320 sess->se_sess = transport_alloc_session(TARGET_PROT_NORMAL);
321 if (IS_ERR(sess->se_sess)) {
322 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
323 ISCSI_LOGIN_STATUS_NO_RESOURCES);
324 goto free_ops;
325 }
326
327 return 0;
328
329 free_ops:
330 kfree(sess->sess_ops);
331 free_id:
332 ida_free(&sess_ida, sess->session_index);
333 free_sess:
334 kfree(sess);
335 conn->sess = NULL;
336 return -ENOMEM;
337 }
338
339 static int iscsi_login_zero_tsih_s2(
340 struct iscsit_conn *conn)
341 {
342 struct iscsi_node_attrib *na;
343 struct iscsit_session *sess = conn->sess;
344 struct iscsi_param *param;
345 bool iser = false;
346
347 sess->tpg = conn->tpg;
348
349 /*
350 * Assign a new TPG Session Handle. Note this is protected with
351 * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
352 */
353 sess->tsih = ++sess->tpg->ntsih;
354 if (!sess->tsih)
355 sess->tsih = ++sess->tpg->ntsih;
356
357 /*
358 * Create the default params from user defined values..
359 */
360 if (iscsi_copy_param_list(&conn->param_list,
361 conn->tpg->param_list, 1) < 0) {
362 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
363 ISCSI_LOGIN_STATUS_NO_RESOURCES);
364 return -1;
365 }
366
367 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
368 iser = true;
369
370 iscsi_set_keys_to_negotiate(conn->param_list, iser);
371
372 if (sess->sess_ops->SessionType)
373 return iscsi_set_keys_irrelevant_for_discovery(
374 conn->param_list);
375
376 na = iscsit_tpg_get_node_attrib(sess);
377
378 /*
379 * If ACL allows non-authorized access in TPG with CHAP,
380 * then set None to AuthMethod.
381 */
382 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
383 if (param && !strstr(param->value, NONE)) {
384 if (!iscsi_conn_auth_required(conn))
385 if (iscsi_change_param_sprintf(conn, "AuthMethod=%s",
386 NONE))
387 return -1;
388 }
389
390 /*
391 * Need to send TargetPortalGroupTag back in first login response
392 * on any iSCSI connection where the Initiator provides TargetName.
393 * See 5.3.1. Login Phase Start
394 *
395 * In our case, we have already located the struct iscsi_tiqn at this point.
396 */
397 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
398 return -1;
399
400 /*
401 * Workaround for Initiators that have broken connection recovery logic.
402 *
403 * "We would really like to get rid of this." Linux-iSCSI.org team
404 */
405 if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
406 return -1;
407
408 /*
409 * Set RDMAExtensions=Yes by default for iSER enabled network portals
410 */
411 if (iser) {
412 struct iscsi_param *param;
413 unsigned long mrdsl, off;
414 int rc;
415
416 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
417 return -1;
418
419 /*
420 * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
421 * Immediate Data + Unsolicited 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 goto check_prot;
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 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
449 return -1;
450 /*
451 * ISER currently requires that ImmediateData + Unsolicited
452 * Data be disabled when protection / signature MRs are enabled.
453 */
454 check_prot:
455 if (sess->se_sess->sup_prot_ops &
456 (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
457 TARGET_PROT_DOUT_INSERT)) {
458
459 if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
460 return -1;
461
462 if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
463 return -1;
464
465 pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
466 " T10-PI enabled ISER session\n");
467 }
468 }
469
470 return 0;
471 }
472
473 static int iscsi_login_non_zero_tsih_s1(
474 struct iscsit_conn *conn,
475 unsigned char *buf)
476 {
477 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
478
479 return iscsi_login_set_conn_values(NULL, conn, pdu->cid);
480 }
481
482 /*
483 * Add a new connection to an existing session.
484 */
485 static int iscsi_login_non_zero_tsih_s2(
486 struct iscsit_conn *conn,
487 unsigned char *buf)
488 {
489 struct iscsi_portal_group *tpg = conn->tpg;
490 struct iscsit_session *sess = NULL, *sess_p = NULL;
491 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
492 struct se_session *se_sess, *se_sess_tmp;
493 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
494 bool iser = false;
495
496 spin_lock_bh(&se_tpg->session_lock);
497 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
498 sess_list) {
499
500 sess_p = (struct iscsit_session *)se_sess->fabric_sess_ptr;
501 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
502 atomic_read(&sess_p->session_logout) ||
503 atomic_read(&sess_p->session_close) ||
504 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
505 continue;
506 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
507 (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
508 iscsit_inc_session_usage_count(sess_p);
509 iscsit_stop_time2retain_timer(sess_p);
510 sess = sess_p;
511 break;
512 }
513 }
514 spin_unlock_bh(&se_tpg->session_lock);
515
516 /*
517 * If the Time2Retain handler has expired, the session is already gone.
518 */
519 if (!sess) {
520 pr_err("Initiator attempting to add a connection to"
521 " a non-existent session, rejecting iSCSI Login.\n");
522 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
523 ISCSI_LOGIN_STATUS_NO_SESSION);
524 return -1;
525 }
526
527 /*
528 * Stop the Time2Retain timer if this is a failed session, we restart
529 * the timer if the login is not successful.
530 */
531 spin_lock_bh(&sess->conn_lock);
532 if (sess->session_state == TARG_SESS_STATE_FAILED)
533 atomic_set(&sess->session_continuation, 1);
534 spin_unlock_bh(&sess->conn_lock);
535
536 if (iscsi_login_set_conn_values(sess, conn, pdu->cid) < 0 ||
537 iscsi_copy_param_list(&conn->param_list,
538 conn->tpg->param_list, 0) < 0) {
539 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
540 ISCSI_LOGIN_STATUS_NO_RESOURCES);
541 return -1;
542 }
543
544 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
545 iser = true;
546
547 iscsi_set_keys_to_negotiate(conn->param_list, iser);
548 /*
549 * Need to send TargetPortalGroupTag back in first login response
550 * on any iSCSI connection where the Initiator provides TargetName.
551 * See 5.3.1. Login Phase Start
552 *
553 * In our case, we have already located the struct iscsi_tiqn at this point.
554 */
555 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
556 return -1;
557
558 return 0;
559 }
560
561 int iscsi_login_post_auth_non_zero_tsih(
562 struct iscsit_conn *conn,
563 u16 cid,
564 u32 exp_statsn)
565 {
566 struct iscsit_conn *conn_ptr = NULL;
567 struct iscsi_conn_recovery *cr = NULL;
568 struct iscsit_session *sess = conn->sess;
569
570 /*
571 * By following item 5 in the login table, if we have found
572 * an existing ISID and a valid/existing TSIH and an existing
573 * CID we do connection reinstatement. Currently we dont not
574 * support it so we send back an non-zero status class to the
575 * initiator and release the new connection.
576 */
577 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
578 if (conn_ptr) {
579 pr_err("Connection exists with CID %hu for %s,"
580 " performing connection reinstatement.\n",
581 conn_ptr->cid, sess->sess_ops->InitiatorName);
582
583 iscsit_connection_reinstatement_rcfr(conn_ptr);
584 iscsit_dec_conn_usage_count(conn_ptr);
585 }
586
587 /*
588 * Check for any connection recovery entries containing CID.
589 * We use the original ExpStatSN sent in the first login request
590 * to acknowledge commands for the failed connection.
591 *
592 * Also note that an explict logout may have already been sent,
593 * but the response may not be sent due to additional connection
594 * loss.
595 */
596 if (sess->sess_ops->ErrorRecoveryLevel == 2) {
597 cr = iscsit_get_inactive_connection_recovery_entry(
598 sess, cid);
599 if (cr) {
600 pr_debug("Performing implicit logout"
601 " for connection recovery on CID: %hu\n",
602 conn->cid);
603 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
604 }
605 }
606
607 /*
608 * Else we follow item 4 from the login table in that we have
609 * found an existing ISID and a valid/existing TSIH and a new
610 * CID we go ahead and continue to add a new connection to the
611 * session.
612 */
613 pr_debug("Adding CID %hu to existing session for %s.\n",
614 cid, sess->sess_ops->InitiatorName);
615
616 if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
617 pr_err("Adding additional connection to this session"
618 " would exceed MaxConnections %d, login failed.\n",
619 sess->sess_ops->MaxConnections);
620 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
621 ISCSI_LOGIN_STATUS_ISID_ERROR);
622 return -1;
623 }
624
625 return 0;
626 }
627
628 static void iscsi_post_login_start_timers(struct iscsit_conn *conn)
629 {
630 struct iscsit_session *sess = conn->sess;
631 /*
632 * FIXME: Unsolicited NopIN support for ISER
633 */
634 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
635 return;
636
637 if (!sess->sess_ops->SessionType)
638 iscsit_start_nopin_timer(conn);
639 }
640
641 int iscsit_start_kthreads(struct iscsit_conn *conn)
642 {
643 int ret = 0;
644
645 spin_lock(&iscsit_global->ts_bitmap_lock);
646 conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
647 ISCSIT_BITMAP_BITS, get_order(1));
648 spin_unlock(&iscsit_global->ts_bitmap_lock);
649
650 if (conn->bitmap_id < 0) {
651 pr_err("bitmap_find_free_region() failed for"
652 " iscsit_start_kthreads()\n");
653 return -ENOMEM;
654 }
655
656 conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
657 "%s", ISCSI_TX_THREAD_NAME);
658 if (IS_ERR(conn->tx_thread)) {
659 pr_err("Unable to start iscsi_target_tx_thread\n");
660 ret = PTR_ERR(conn->tx_thread);
661 goto out_bitmap;
662 }
663 conn->tx_thread_active = true;
664
665 conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
666 "%s", ISCSI_RX_THREAD_NAME);
667 if (IS_ERR(conn->rx_thread)) {
668 pr_err("Unable to start iscsi_target_rx_thread\n");
669 ret = PTR_ERR(conn->rx_thread);
670 goto out_tx;
671 }
672 conn->rx_thread_active = true;
673
674 return 0;
675 out_tx:
676 send_sig(SIGINT, conn->tx_thread, 1);
677 kthread_stop(conn->tx_thread);
678 conn->tx_thread_active = false;
679 out_bitmap:
680 spin_lock(&iscsit_global->ts_bitmap_lock);
681 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
682 get_order(1));
683 spin_unlock(&iscsit_global->ts_bitmap_lock);
684 return ret;
685 }
686
687 void iscsi_post_login_handler(
688 struct iscsi_np *np,
689 struct iscsit_conn *conn,
690 u8 zero_tsih)
691 {
692 int stop_timer = 0;
693 struct iscsit_session *sess = conn->sess;
694 struct se_session *se_sess = sess->se_sess;
695 struct iscsi_portal_group *tpg = sess->tpg;
696 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
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 /*
708 * SCSI Initiator -> SCSI Target Port Mapping
709 */
710 if (!zero_tsih) {
711 iscsi_set_session_parameters(sess->sess_ops,
712 conn->param_list, 0);
713 iscsi_release_param_list(conn->param_list);
714 conn->param_list = NULL;
715
716 spin_lock_bh(&sess->conn_lock);
717 atomic_set(&sess->session_continuation, 0);
718 if (sess->session_state == TARG_SESS_STATE_FAILED) {
719 pr_debug("Moving to"
720 " TARG_SESS_STATE_LOGGED_IN.\n");
721 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
722 stop_timer = 1;
723 }
724
725 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"
726 " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
727 &conn->local_sockaddr, tpg->tpgt);
728
729 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
730 atomic_inc(&sess->nconn);
731 pr_debug("Incremented iSCSI Connection count to %d"
732 " from node: %s\n", atomic_read(&sess->nconn),
733 sess->sess_ops->InitiatorName);
734 spin_unlock_bh(&sess->conn_lock);
735
736 iscsi_post_login_start_timers(conn);
737 /*
738 * Determine CPU mask to ensure connection's RX and TX kthreads
739 * are scheduled on the same CPU.
740 */
741 iscsit_thread_get_cpumask(conn);
742 conn->conn_rx_reset_cpumask = 1;
743 conn->conn_tx_reset_cpumask = 1;
744 /*
745 * Wakeup the sleeping iscsi_target_rx_thread() now that
746 * iscsit_conn is in TARG_CONN_STATE_LOGGED_IN state.
747 */
748 complete(&conn->rx_login_comp);
749 iscsit_dec_conn_usage_count(conn);
750
751 if (stop_timer) {
752 spin_lock_bh(&se_tpg->session_lock);
753 iscsit_stop_time2retain_timer(sess);
754 spin_unlock_bh(&se_tpg->session_lock);
755 }
756 iscsit_dec_session_usage_count(sess);
757 return;
758 }
759
760 iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
761 iscsi_release_param_list(conn->param_list);
762 conn->param_list = NULL;
763
764 iscsit_determine_maxcmdsn(sess);
765
766 spin_lock_bh(&se_tpg->session_lock);
767 __transport_register_session(&sess->tpg->tpg_se_tpg,
768 se_sess->se_node_acl, se_sess, sess);
769 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
770 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
771
772 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
773 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
774 tpg->tpgt);
775
776 spin_lock_bh(&sess->conn_lock);
777 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
778 atomic_inc(&sess->nconn);
779 pr_debug("Incremented iSCSI Connection count to %d from node:"
780 " %s\n", atomic_read(&sess->nconn),
781 sess->sess_ops->InitiatorName);
782 spin_unlock_bh(&sess->conn_lock);
783
784 sess->sid = tpg->sid++;
785 if (!sess->sid)
786 sess->sid = tpg->sid++;
787 pr_debug("Established iSCSI session from node: %s\n",
788 sess->sess_ops->InitiatorName);
789
790 tpg->nsessions++;
791 if (tpg->tpg_tiqn)
792 tpg->tpg_tiqn->tiqn_nsessions++;
793
794 pr_debug("Incremented number of active iSCSI sessions to %u on"
795 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
796 spin_unlock_bh(&se_tpg->session_lock);
797
798 iscsi_post_login_start_timers(conn);
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 * Wakeup the sleeping iscsi_target_rx_thread() now that
808 * iscsit_conn is in TARG_CONN_STATE_LOGGED_IN state.
809 */
810 complete(&conn->rx_login_comp);
811 iscsit_dec_conn_usage_count(conn);
812 }
813
814 int iscsit_setup_np(
815 struct iscsi_np *np,
816 struct sockaddr_storage *sockaddr)
817 {
818 struct socket *sock = NULL;
819 int backlog = ISCSIT_TCP_BACKLOG, ret, len;
820
821 switch (np->np_network_transport) {
822 case ISCSI_TCP:
823 np->np_ip_proto = IPPROTO_TCP;
824 np->np_sock_type = SOCK_STREAM;
825 break;
826 case ISCSI_SCTP_TCP:
827 np->np_ip_proto = IPPROTO_SCTP;
828 np->np_sock_type = SOCK_STREAM;
829 break;
830 case ISCSI_SCTP_UDP:
831 np->np_ip_proto = IPPROTO_SCTP;
832 np->np_sock_type = SOCK_SEQPACKET;
833 break;
834 default:
835 pr_err("Unsupported network_transport: %d\n",
836 np->np_network_transport);
837 return -EINVAL;
838 }
839
840 ret = sock_create(sockaddr->ss_family, np->np_sock_type,
841 np->np_ip_proto, &sock);
842 if (ret < 0) {
843 pr_err("sock_create() failed.\n");
844 return ret;
845 }
846 np->np_socket = sock;
847 /*
848 * Setup the np->np_sockaddr from the passed sockaddr setup
849 * in iscsi_target_configfs.c code..
850 */
851 memcpy(&np->np_sockaddr, sockaddr,
852 sizeof(struct sockaddr_storage));
853
854 if (sockaddr->ss_family == AF_INET6)
855 len = sizeof(struct sockaddr_in6);
856 else
857 len = sizeof(struct sockaddr_in);
858 /*
859 * Set SO_REUSEADDR, and disable Nagle Algorithm with TCP_NODELAY.
860 */
861 if (np->np_network_transport == ISCSI_TCP)
862 tcp_sock_set_nodelay(sock->sk);
863 sock_set_reuseaddr(sock->sk);
864 ip_sock_set_freebind(sock->sk);
865
866 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
867 if (ret < 0) {
868 pr_err("kernel_bind() failed: %d\n", ret);
869 goto fail;
870 }
871
872 ret = kernel_listen(sock, backlog);
873 if (ret != 0) {
874 pr_err("kernel_listen() failed: %d\n", ret);
875 goto fail;
876 }
877
878 return 0;
879 fail:
880 np->np_socket = NULL;
881 sock_release(sock);
882 return ret;
883 }
884
885 int iscsi_target_setup_login_socket(
886 struct iscsi_np *np,
887 struct sockaddr_storage *sockaddr)
888 {
889 struct iscsit_transport *t;
890 int rc;
891
892 t = iscsit_get_transport(np->np_network_transport);
893 if (!t)
894 return -EINVAL;
895
896 rc = t->iscsit_setup_np(np, sockaddr);
897 if (rc < 0) {
898 iscsit_put_transport(t);
899 return rc;
900 }
901
902 np->np_transport = t;
903 np->enabled = true;
904 return 0;
905 }
906
907 int iscsit_accept_np(struct iscsi_np *np, struct iscsit_conn *conn)
908 {
909 struct socket *new_sock, *sock = np->np_socket;
910 struct sockaddr_in sock_in;
911 struct sockaddr_in6 sock_in6;
912 int rc;
913
914 rc = kernel_accept(sock, &new_sock, 0);
915 if (rc < 0)
916 return rc;
917
918 conn->sock = new_sock;
919 conn->login_family = np->np_sockaddr.ss_family;
920
921 if (np->np_sockaddr.ss_family == AF_INET6) {
922 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
923
924 rc = conn->sock->ops->getname(conn->sock,
925 (struct sockaddr *)&sock_in6, 1);
926 if (rc >= 0) {
927 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
928 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
929 } else {
930 /* Pretend to be an ipv4 socket */
931 sock_in.sin_family = AF_INET;
932 sock_in.sin_port = sock_in6.sin6_port;
933 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
934 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
935 }
936 }
937
938 rc = conn->sock->ops->getname(conn->sock,
939 (struct sockaddr *)&sock_in6, 0);
940 if (rc >= 0) {
941 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
942 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
943 } else {
944 /* Pretend to be an ipv4 socket */
945 sock_in.sin_family = AF_INET;
946 sock_in.sin_port = sock_in6.sin6_port;
947 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
948 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
949 }
950 }
951 } else {
952 memset(&sock_in, 0, sizeof(struct sockaddr_in));
953
954 rc = conn->sock->ops->getname(conn->sock,
955 (struct sockaddr *)&sock_in, 1);
956 if (rc >= 0)
957 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
958
959 rc = conn->sock->ops->getname(conn->sock,
960 (struct sockaddr *)&sock_in, 0);
961 if (rc >= 0)
962 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
963 }
964
965 return 0;
966 }
967
968 int iscsit_get_login_rx(struct iscsit_conn *conn, struct iscsi_login *login)
969 {
970 struct iscsi_login_req *login_req;
971 u32 padding = 0, payload_length;
972
973 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
974 return -1;
975
976 login_req = (struct iscsi_login_req *)login->req;
977 payload_length = ntoh24(login_req->dlength);
978 padding = ((-payload_length) & 3);
979
980 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
981 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
982 login_req->flags, login_req->itt, login_req->cmdsn,
983 login_req->exp_statsn, login_req->cid, payload_length);
984 /*
985 * Setup the initial iscsi_login values from the leading
986 * login request PDU.
987 */
988 if (login->first_request) {
989 login_req = (struct iscsi_login_req *)login->req;
990 login->leading_connection = (!login_req->tsih) ? 1 : 0;
991 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
992 login->version_min = login_req->min_version;
993 login->version_max = login_req->max_version;
994 memcpy(login->isid, login_req->isid, 6);
995 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
996 login->init_task_tag = login_req->itt;
997 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
998 login->cid = be16_to_cpu(login_req->cid);
999 login->tsih = be16_to_cpu(login_req->tsih);
1000 }
1001
1002 if (iscsi_target_check_login_request(conn, login) < 0)
1003 return -1;
1004
1005 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1006 if (iscsi_login_rx_data(conn, login->req_buf,
1007 payload_length + padding) < 0)
1008 return -1;
1009
1010 return 0;
1011 }
1012
1013 int iscsit_put_login_tx(struct iscsit_conn *conn, struct iscsi_login *login,
1014 u32 length)
1015 {
1016 if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1017 return -1;
1018
1019 return 0;
1020 }
1021
1022 static int
1023 iscsit_conn_set_transport(struct iscsit_conn *conn, struct iscsit_transport *t)
1024 {
1025 int rc;
1026
1027 if (!t->owner) {
1028 conn->conn_transport = t;
1029 return 0;
1030 }
1031
1032 rc = try_module_get(t->owner);
1033 if (!rc) {
1034 pr_err("try_module_get() failed for %s\n", t->name);
1035 return -EINVAL;
1036 }
1037
1038 conn->conn_transport = t;
1039 return 0;
1040 }
1041
1042 static struct iscsit_conn *iscsit_alloc_conn(struct iscsi_np *np)
1043 {
1044 struct iscsit_conn *conn;
1045
1046 conn = kzalloc(sizeof(struct iscsit_conn), GFP_KERNEL);
1047 if (!conn) {
1048 pr_err("Could not allocate memory for new connection\n");
1049 return NULL;
1050 }
1051 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1052 conn->conn_state = TARG_CONN_STATE_FREE;
1053
1054 init_waitqueue_head(&conn->queues_wq);
1055 INIT_LIST_HEAD(&conn->conn_list);
1056 INIT_LIST_HEAD(&conn->conn_cmd_list);
1057 INIT_LIST_HEAD(&conn->immed_queue_list);
1058 INIT_LIST_HEAD(&conn->response_queue_list);
1059 init_completion(&conn->conn_post_wait_comp);
1060 init_completion(&conn->conn_wait_comp);
1061 init_completion(&conn->conn_wait_rcfr_comp);
1062 init_completion(&conn->conn_waiting_on_uc_comp);
1063 init_completion(&conn->conn_logout_comp);
1064 init_completion(&conn->rx_half_close_comp);
1065 init_completion(&conn->tx_half_close_comp);
1066 init_completion(&conn->rx_login_comp);
1067 spin_lock_init(&conn->cmd_lock);
1068 spin_lock_init(&conn->conn_usage_lock);
1069 spin_lock_init(&conn->immed_queue_lock);
1070 spin_lock_init(&conn->nopin_timer_lock);
1071 spin_lock_init(&conn->response_queue_lock);
1072 spin_lock_init(&conn->state_lock);
1073 spin_lock_init(&conn->login_worker_lock);
1074 spin_lock_init(&conn->login_timer_lock);
1075
1076 timer_setup(&conn->nopin_response_timer,
1077 iscsit_handle_nopin_response_timeout, 0);
1078 timer_setup(&conn->nopin_timer, iscsit_handle_nopin_timeout, 0);
1079 timer_setup(&conn->login_timer, iscsit_login_timeout, 0);
1080
1081 if (iscsit_conn_set_transport(conn, np->np_transport) < 0)
1082 goto free_conn;
1083
1084 conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
1085 if (!conn->conn_ops) {
1086 pr_err("Unable to allocate memory for struct iscsi_conn_ops.\n");
1087 goto put_transport;
1088 }
1089
1090 if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
1091 pr_err("Unable to allocate conn->conn_cpumask\n");
1092 goto free_conn_ops;
1093 }
1094
1095 if (!zalloc_cpumask_var(&conn->allowed_cpumask, GFP_KERNEL)) {
1096 pr_err("Unable to allocate conn->allowed_cpumask\n");
1097 goto free_conn_cpumask;
1098 }
1099
1100 conn->cmd_cnt = target_alloc_cmd_counter();
1101 if (!conn->cmd_cnt)
1102 goto free_conn_allowed_cpumask;
1103
1104 return conn;
1105
1106 free_conn_allowed_cpumask:
1107 free_cpumask_var(conn->allowed_cpumask);
1108 free_conn_cpumask:
1109 free_cpumask_var(conn->conn_cpumask);
1110 free_conn_ops:
1111 kfree(conn->conn_ops);
1112 put_transport:
1113 iscsit_put_transport(conn->conn_transport);
1114 free_conn:
1115 kfree(conn);
1116 return NULL;
1117 }
1118
1119 void iscsit_free_conn(struct iscsit_conn *conn)
1120 {
1121 target_free_cmd_counter(conn->cmd_cnt);
1122 free_cpumask_var(conn->allowed_cpumask);
1123 free_cpumask_var(conn->conn_cpumask);
1124 kfree(conn->conn_ops);
1125 iscsit_put_transport(conn->conn_transport);
1126 kfree(conn);
1127 }
1128
1129 void iscsi_target_login_sess_out(struct iscsit_conn *conn,
1130 bool zero_tsih, bool new_sess)
1131 {
1132 if (!new_sess)
1133 goto old_sess_out;
1134
1135 pr_err("iSCSI Login negotiation failed.\n");
1136 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1137 ISCSI_LOGIN_STATUS_INIT_ERR);
1138 if (!zero_tsih || !conn->sess)
1139 goto old_sess_out;
1140
1141 transport_free_session(conn->sess->se_sess);
1142 ida_free(&sess_ida, conn->sess->session_index);
1143 kfree(conn->sess->sess_ops);
1144 kfree(conn->sess);
1145 conn->sess = NULL;
1146
1147 old_sess_out:
1148 /*
1149 * If login negotiation fails check if the Time2Retain timer
1150 * needs to be restarted.
1151 */
1152 if (!zero_tsih && conn->sess) {
1153 spin_lock_bh(&conn->sess->conn_lock);
1154 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1155 struct se_portal_group *se_tpg =
1156 &conn->tpg->tpg_se_tpg;
1157
1158 atomic_set(&conn->sess->session_continuation, 0);
1159 spin_unlock_bh(&conn->sess->conn_lock);
1160 spin_lock_bh(&se_tpg->session_lock);
1161 iscsit_start_time2retain_handler(conn->sess);
1162 spin_unlock_bh(&se_tpg->session_lock);
1163 } else
1164 spin_unlock_bh(&conn->sess->conn_lock);
1165 iscsit_dec_session_usage_count(conn->sess);
1166 }
1167
1168 ahash_request_free(conn->conn_tx_hash);
1169 if (conn->conn_rx_hash) {
1170 struct crypto_ahash *tfm;
1171
1172 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
1173 ahash_request_free(conn->conn_rx_hash);
1174 crypto_free_ahash(tfm);
1175 }
1176
1177 if (conn->param_list) {
1178 iscsi_release_param_list(conn->param_list);
1179 conn->param_list = NULL;
1180 }
1181 iscsi_target_nego_release(conn);
1182
1183 if (conn->sock) {
1184 sock_release(conn->sock);
1185 conn->sock = NULL;
1186 }
1187
1188 if (conn->conn_transport->iscsit_wait_conn)
1189 conn->conn_transport->iscsit_wait_conn(conn);
1190
1191 if (conn->conn_transport->iscsit_free_conn)
1192 conn->conn_transport->iscsit_free_conn(conn);
1193
1194 iscsit_free_conn(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;
1201 struct iscsit_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 (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1212 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1213 spin_unlock_bh(&np->np_thread_lock);
1214 complete(&np->np_restart_comp);
1215 return 1;
1216 } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1217 spin_unlock_bh(&np->np_thread_lock);
1218 goto exit;
1219 } else {
1220 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1221 }
1222 spin_unlock_bh(&np->np_thread_lock);
1223
1224 conn = iscsit_alloc_conn(np);
1225 if (!conn) {
1226 /* Get another socket */
1227 return 1;
1228 }
1229
1230 rc = np->np_transport->iscsit_accept_np(np, conn);
1231 if (rc == -ENOSYS) {
1232 complete(&np->np_restart_comp);
1233 iscsit_free_conn(conn);
1234 goto exit;
1235 } else if (rc < 0) {
1236 spin_lock_bh(&np->np_thread_lock);
1237 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1238 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1239 spin_unlock_bh(&np->np_thread_lock);
1240 complete(&np->np_restart_comp);
1241 iscsit_free_conn(conn);
1242 /* Get another socket */
1243 return 1;
1244 }
1245 spin_unlock_bh(&np->np_thread_lock);
1246 iscsit_free_conn(conn);
1247 return 1;
1248 }
1249 /*
1250 * Perform the remaining iSCSI connection initialization items..
1251 */
1252 login = iscsi_login_init_conn(conn);
1253 if (!login) {
1254 goto new_sess_out;
1255 }
1256
1257 iscsit_start_login_timer(conn, current);
1258
1259 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1260 conn->conn_state = TARG_CONN_STATE_XPT_UP;
1261 /*
1262 * This will process the first login request + payload..
1263 */
1264 rc = np->np_transport->iscsit_get_login_rx(conn, login);
1265 if (rc == 1)
1266 return 1;
1267 else if (rc < 0)
1268 goto new_sess_out;
1269
1270 buffer = &login->req[0];
1271 pdu = (struct iscsi_login_req *)buffer;
1272 /*
1273 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1274 * when Status-Class != 0.
1275 */
1276 conn->login_itt = pdu->itt;
1277
1278 spin_lock_bh(&np->np_thread_lock);
1279 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1280 spin_unlock_bh(&np->np_thread_lock);
1281 pr_err("iSCSI Network Portal on %pISpc currently not"
1282 " active.\n", &np->np_sockaddr);
1283 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1284 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1285 goto new_sess_out;
1286 }
1287 spin_unlock_bh(&np->np_thread_lock);
1288
1289 conn->network_transport = np->np_network_transport;
1290
1291 pr_debug("Received iSCSI login request from %pISpc on %s Network"
1292 " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name,
1293 &conn->local_sockaddr);
1294
1295 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1296 conn->conn_state = TARG_CONN_STATE_IN_LOGIN;
1297
1298 if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1299 pdu->min_version) < 0)
1300 goto new_sess_out;
1301
1302 zero_tsih = (pdu->tsih == 0x0000);
1303 if (zero_tsih) {
1304 /*
1305 * This is the leading connection of a new session.
1306 * We wait until after authentication to check for
1307 * session reinstatement.
1308 */
1309 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1310 goto new_sess_out;
1311 } else {
1312 /*
1313 * Add a new connection to an existing session.
1314 * We check for a non-existant session in
1315 * iscsi_login_non_zero_tsih_s2() below based
1316 * on ISID/TSIH, but wait until after authentication
1317 * to check for connection reinstatement, etc.
1318 */
1319 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1320 goto new_sess_out;
1321 }
1322 /*
1323 * SessionType: Discovery
1324 *
1325 * Locates Default Portal
1326 *
1327 * SessionType: Normal
1328 *
1329 * Locates Target Portal from NP -> Target IQN
1330 */
1331 rc = iscsi_target_locate_portal(np, conn, login);
1332 if (rc < 0) {
1333 tpg = conn->tpg;
1334 goto new_sess_out;
1335 }
1336 login->zero_tsih = zero_tsih;
1337
1338 if (conn->sess)
1339 conn->sess->se_sess->sup_prot_ops =
1340 conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1341
1342 tpg = conn->tpg;
1343 if (!tpg) {
1344 pr_err("Unable to locate struct iscsit_conn->tpg\n");
1345 goto new_sess_out;
1346 }
1347
1348 if (zero_tsih) {
1349 if (iscsi_login_zero_tsih_s2(conn) < 0)
1350 goto new_sess_out;
1351 } else {
1352 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1353 goto old_sess_out;
1354 }
1355
1356 if (conn->conn_transport->iscsit_validate_params) {
1357 ret = conn->conn_transport->iscsit_validate_params(conn);
1358 if (ret < 0) {
1359 if (zero_tsih)
1360 goto new_sess_out;
1361 else
1362 goto old_sess_out;
1363 }
1364 }
1365
1366 ret = iscsi_target_start_negotiation(login, conn);
1367 if (ret < 0)
1368 goto new_sess_out;
1369
1370 if (ret == 1) {
1371 tpg_np = conn->tpg_np;
1372
1373 iscsi_post_login_handler(np, conn, zero_tsih);
1374 iscsit_deaccess_np(np, tpg, tpg_np);
1375 }
1376
1377 tpg = NULL;
1378 tpg_np = NULL;
1379 /* Get another socket */
1380 return 1;
1381
1382 new_sess_out:
1383 new_sess = true;
1384 old_sess_out:
1385 iscsit_stop_login_timer(conn);
1386 tpg_np = conn->tpg_np;
1387 iscsi_target_login_sess_out(conn, zero_tsih, new_sess);
1388 new_sess = false;
1389
1390 if (tpg) {
1391 iscsit_deaccess_np(np, tpg, tpg_np);
1392 tpg = NULL;
1393 tpg_np = NULL;
1394 }
1395
1396 return 1;
1397
1398 exit:
1399 spin_lock_bh(&np->np_thread_lock);
1400 np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1401 spin_unlock_bh(&np->np_thread_lock);
1402
1403 return 0;
1404 }
1405
1406 int iscsi_target_login_thread(void *arg)
1407 {
1408 struct iscsi_np *np = arg;
1409 int ret;
1410
1411 allow_signal(SIGINT);
1412
1413 while (1) {
1414 ret = __iscsi_target_login_thread(np);
1415 /*
1416 * We break and exit here unless another sock_accept() call
1417 * is expected.
1418 */
1419 if (ret != 1)
1420 break;
1421 }
1422
1423 while (!kthread_should_stop()) {
1424 msleep(100);
1425 }
1426
1427 return 0;
1428 }
Kernel DRM miscellaneous fixes and cross-tree changes