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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / target / iscsi / iscsi_target_login.c
blobf53330813207f6182dd003b35c5cd2ddc54d11b1
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/ipv6.h> /* ipv6_addr_v4mapped() */
19 #include <scsi/iscsi_proto.h>
20 #include <target/target_core_base.h>
21 #include <target/target_core_fabric.h>
22
23 #include <target/iscsi/iscsi_target_core.h>
24 #include <target/iscsi/iscsi_target_stat.h>
25 #include "iscsi_target_device.h"
26 #include "iscsi_target_nego.h"
27 #include "iscsi_target_erl0.h"
28 #include "iscsi_target_erl2.h"
29 #include "iscsi_target_login.h"
30 #include "iscsi_target_tpg.h"
31 #include "iscsi_target_util.h"
32 #include "iscsi_target.h"
33 #include "iscsi_target_parameters.h"
34
35 #include <target/iscsi/iscsi_transport.h>
36
37 static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
38 {
39 struct iscsi_login *login;
40
41 login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
42 if (!login) {
43 pr_err("Unable to allocate memory for struct iscsi_login.\n");
44 return NULL;
45 }
46 conn->login = login;
47 login->conn = conn;
48 login->first_request = 1;
49
50 login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
51 if (!login->req_buf) {
52 pr_err("Unable to allocate memory for response buffer.\n");
53 goto out_login;
54 }
55
56 login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
57 if (!login->rsp_buf) {
58 pr_err("Unable to allocate memory for request buffer.\n");
59 goto out_req_buf;
60 }
61
62 conn->conn_login = login;
63
64 return login;
65
66 out_req_buf:
67 kfree(login->req_buf);
68 out_login:
69 kfree(login);
70 return NULL;
71 }
72
73 /*
74 * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
75 * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
76 */
77 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
78 {
79 struct crypto_ahash *tfm;
80
81 /*
82 * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
83 * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
84 * to software 1x8 byte slicing from crc32c.ko
85 */
86 tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
87 if (IS_ERR(tfm)) {
88 pr_err("crypto_alloc_ahash() failed\n");
89 return -ENOMEM;
90 }
91
92 conn->conn_rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
93 if (!conn->conn_rx_hash) {
94 pr_err("ahash_request_alloc() failed for conn_rx_hash\n");
95 crypto_free_ahash(tfm);
96 return -ENOMEM;
97 }
98 ahash_request_set_callback(conn->conn_rx_hash, 0, NULL, NULL);
99
100 conn->conn_tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
101 if (!conn->conn_tx_hash) {
102 pr_err("ahash_request_alloc() failed for conn_tx_hash\n");
103 ahash_request_free(conn->conn_rx_hash);
104 conn->conn_rx_hash = NULL;
105 crypto_free_ahash(tfm);
106 return -ENOMEM;
107 }
108 ahash_request_set_callback(conn->conn_tx_hash, 0, NULL, NULL);
109
110 return 0;
111 }
112
113 static int iscsi_login_check_initiator_version(
114 struct iscsi_conn *conn,
115 u8 version_max,
116 u8 version_min)
117 {
118 if ((version_max != 0x00) || (version_min != 0x00)) {
119 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
120 " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
121 version_min, version_max);
122 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
123 ISCSI_LOGIN_STATUS_NO_VERSION);
124 return -1;
125 }
126
127 return 0;
128 }
129
130 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
131 {
132 int sessiontype;
133 struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
134 struct iscsi_portal_group *tpg = conn->tpg;
135 struct iscsi_session *sess = NULL, *sess_p = NULL;
136 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
137 struct se_session *se_sess, *se_sess_tmp;
138
139 initiatorname_param = iscsi_find_param_from_key(
140 INITIATORNAME, conn->param_list);
141 sessiontype_param = iscsi_find_param_from_key(
142 SESSIONTYPE, conn->param_list);
143 if (!initiatorname_param || !sessiontype_param) {
144 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
145 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
146 return -1;
147 }
148
149 sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
150
151 spin_lock_bh(&se_tpg->session_lock);
152 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
153 sess_list) {
154
155 sess_p = se_sess->fabric_sess_ptr;
156 spin_lock(&sess_p->conn_lock);
157 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
158 atomic_read(&sess_p->session_logout) ||
159 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
160 spin_unlock(&sess_p->conn_lock);
161 continue;
162 }
163 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
164 (!strcmp(sess_p->sess_ops->InitiatorName,
165 initiatorname_param->value) &&
166 (sess_p->sess_ops->SessionType == sessiontype))) {
167 atomic_set(&sess_p->session_reinstatement, 1);
168 atomic_set(&sess_p->session_fall_back_to_erl0, 1);
169 spin_unlock(&sess_p->conn_lock);
170 iscsit_inc_session_usage_count(sess_p);
171 iscsit_stop_time2retain_timer(sess_p);
172 sess = sess_p;
173 break;
174 }
175 spin_unlock(&sess_p->conn_lock);
176 }
177 spin_unlock_bh(&se_tpg->session_lock);
178 /*
179 * If the Time2Retain handler has expired, the session is already gone.
180 */
181 if (!sess)
182 return 0;
183
184 pr_debug("%s iSCSI Session SID %u is still active for %s,"
185 " performing session reinstatement.\n", (sessiontype) ?
186 "Discovery" : "Normal", sess->sid,
187 sess->sess_ops->InitiatorName);
188
189 spin_lock_bh(&sess->conn_lock);
190 if (sess->session_state == TARG_SESS_STATE_FAILED) {
191 spin_unlock_bh(&sess->conn_lock);
192 iscsit_dec_session_usage_count(sess);
193 iscsit_close_session(sess);
194 return 0;
195 }
196 spin_unlock_bh(&sess->conn_lock);
197
198 iscsit_stop_session(sess, 1, 1);
199 iscsit_dec_session_usage_count(sess);
200
201 iscsit_close_session(sess);
202 return 0;
203 }
204
205 static int iscsi_login_set_conn_values(
206 struct iscsi_session *sess,
207 struct iscsi_conn *conn,
208 __be16 cid)
209 {
210 int ret;
211 conn->sess = sess;
212 conn->cid = be16_to_cpu(cid);
213 /*
214 * Generate a random Status sequence number (statsn) for the new
215 * iSCSI connection.
216 */
217 ret = get_random_bytes_wait(&conn->stat_sn, sizeof(u32));
218 if (unlikely(ret))
219 return ret;
220
221 mutex_lock(&auth_id_lock);
222 conn->auth_id = iscsit_global->auth_id++;
223 mutex_unlock(&auth_id_lock);
224 return 0;
225 }
226
227 __printf(2, 3) int iscsi_change_param_sprintf(
228 struct iscsi_conn *conn,
229 const char *fmt, ...)
230 {
231 va_list args;
232 unsigned char buf[64];
233
234 memset(buf, 0, sizeof buf);
235
236 va_start(args, fmt);
237 vsnprintf(buf, sizeof buf, fmt, args);
238 va_end(args);
239
240 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
241 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
242 ISCSI_LOGIN_STATUS_NO_RESOURCES);
243 return -1;
244 }
245
246 return 0;
247 }
248 EXPORT_SYMBOL(iscsi_change_param_sprintf);
249
250 /*
251 * This is the leading connection of a new session,
252 * or session reinstatement.
253 */
254 static int iscsi_login_zero_tsih_s1(
255 struct iscsi_conn *conn,
256 unsigned char *buf)
257 {
258 struct iscsi_session *sess = NULL;
259 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
260 int ret;
261
262 sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
263 if (!sess) {
264 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
265 ISCSI_LOGIN_STATUS_NO_RESOURCES);
266 pr_err("Could not allocate memory for session\n");
267 return -ENOMEM;
268 }
269
270 if (iscsi_login_set_conn_values(sess, conn, pdu->cid))
271 goto free_sess;
272
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 timer_setup(&sess->time2retain_timer,
292 iscsit_handle_time2retain_timeout, 0);
293
294 ret = ida_alloc(&sess_ida, GFP_KERNEL);
295 if (ret < 0) {
296 pr_err("Session ID allocation failed %d\n", ret);
297 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
298 ISCSI_LOGIN_STATUS_NO_RESOURCES);
299 goto free_sess;
300 }
301
302 sess->session_index = ret;
303 sess->creation_time = get_jiffies_64();
304 /*
305 * The FFP CmdSN window values will be allocated from the TPG's
306 * Initiator Node's ACL once the login has been successfully completed.
307 */
308 atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn));
309
310 sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
311 if (!sess->sess_ops) {
312 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
313 ISCSI_LOGIN_STATUS_NO_RESOURCES);
314 pr_err("Unable to allocate memory for"
315 " struct iscsi_sess_ops.\n");
316 goto free_id;
317 }
318
319 sess->se_sess = transport_alloc_session(TARGET_PROT_NORMAL);
320 if (IS_ERR(sess->se_sess)) {
321 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
322 ISCSI_LOGIN_STATUS_NO_RESOURCES);
323 goto free_ops;
324 }
325
326 return 0;
327
328 free_ops:
329 kfree(sess->sess_ops);
330 free_id:
331 ida_free(&sess_ida, sess->session_index);
332 free_sess:
333 kfree(sess);
334 conn->sess = NULL;
335 return -ENOMEM;
336 }
337
338 static int iscsi_login_zero_tsih_s2(
339 struct iscsi_conn *conn)
340 {
341 struct iscsi_node_attrib *na;
342 struct iscsi_session *sess = conn->sess;
343 bool iser = false;
344
345 sess->tpg = conn->tpg;
346
347 /*
348 * Assign a new TPG Session Handle. Note this is protected with
349 * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
350 */
351 sess->tsih = ++sess->tpg->ntsih;
352 if (!sess->tsih)
353 sess->tsih = ++sess->tpg->ntsih;
354
355 /*
356 * Create the default params from user defined values..
357 */
358 if (iscsi_copy_param_list(&conn->param_list,
359 conn->tpg->param_list, 1) < 0) {
360 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
361 ISCSI_LOGIN_STATUS_NO_RESOURCES);
362 return -1;
363 }
364
365 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
366 iser = true;
367
368 iscsi_set_keys_to_negotiate(conn->param_list, iser);
369
370 if (sess->sess_ops->SessionType)
371 return iscsi_set_keys_irrelevant_for_discovery(
372 conn->param_list);
373
374 na = iscsit_tpg_get_node_attrib(sess);
375
376 /*
377 * Need to send TargetPortalGroupTag back in first login response
378 * on any iSCSI connection where the Initiator provides TargetName.
379 * See 5.3.1. Login Phase Start
380 *
381 * In our case, we have already located the struct iscsi_tiqn at this point.
382 */
383 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
384 return -1;
385
386 /*
387 * Workaround for Initiators that have broken connection recovery logic.
388 *
389 * "We would really like to get rid of this." Linux-iSCSI.org team
390 */
391 if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
392 return -1;
393
394 /*
395 * Set RDMAExtensions=Yes by default for iSER enabled network portals
396 */
397 if (iser) {
398 struct iscsi_param *param;
399 unsigned long mrdsl, off;
400 int rc;
401
402 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
403 return -1;
404
405 /*
406 * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
407 * Immediate Data + Unsolicited Data-OUT if necessary..
408 */
409 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
410 conn->param_list);
411 if (!param) {
412 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
413 ISCSI_LOGIN_STATUS_NO_RESOURCES);
414 return -1;
415 }
416 rc = kstrtoul(param->value, 0, &mrdsl);
417 if (rc < 0) {
418 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
419 ISCSI_LOGIN_STATUS_NO_RESOURCES);
420 return -1;
421 }
422 off = mrdsl % PAGE_SIZE;
423 if (!off)
424 goto check_prot;
425
426 if (mrdsl < PAGE_SIZE)
427 mrdsl = PAGE_SIZE;
428 else
429 mrdsl -= off;
430
431 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
432 " to PAGE_SIZE\n", mrdsl);
433
434 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
435 return -1;
436 /*
437 * ISER currently requires that ImmediateData + Unsolicited
438 * Data be disabled when protection / signature MRs are enabled.
439 */
440 check_prot:
441 if (sess->se_sess->sup_prot_ops &
442 (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
443 TARGET_PROT_DOUT_INSERT)) {
444
445 if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
446 return -1;
447
448 if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
449 return -1;
450
451 pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
452 " T10-PI enabled ISER session\n");
453 }
454 }
455
456 return 0;
457 }
458
459 static int iscsi_login_non_zero_tsih_s1(
460 struct iscsi_conn *conn,
461 unsigned char *buf)
462 {
463 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
464
465 return iscsi_login_set_conn_values(NULL, conn, pdu->cid);
466 }
467
468 /*
469 * Add a new connection to an existing session.
470 */
471 static int iscsi_login_non_zero_tsih_s2(
472 struct iscsi_conn *conn,
473 unsigned char *buf)
474 {
475 struct iscsi_portal_group *tpg = conn->tpg;
476 struct iscsi_session *sess = NULL, *sess_p = NULL;
477 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
478 struct se_session *se_sess, *se_sess_tmp;
479 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
480 bool iser = false;
481
482 spin_lock_bh(&se_tpg->session_lock);
483 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
484 sess_list) {
485
486 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
487 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
488 atomic_read(&sess_p->session_logout) ||
489 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
490 continue;
491 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
492 (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
493 iscsit_inc_session_usage_count(sess_p);
494 iscsit_stop_time2retain_timer(sess_p);
495 sess = sess_p;
496 break;
497 }
498 }
499 spin_unlock_bh(&se_tpg->session_lock);
500
501 /*
502 * If the Time2Retain handler has expired, the session is already gone.
503 */
504 if (!sess) {
505 pr_err("Initiator attempting to add a connection to"
506 " a non-existent session, rejecting iSCSI Login.\n");
507 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
508 ISCSI_LOGIN_STATUS_NO_SESSION);
509 return -1;
510 }
511
512 /*
513 * Stop the Time2Retain timer if this is a failed session, we restart
514 * the timer if the login is not successful.
515 */
516 spin_lock_bh(&sess->conn_lock);
517 if (sess->session_state == TARG_SESS_STATE_FAILED)
518 atomic_set(&sess->session_continuation, 1);
519 spin_unlock_bh(&sess->conn_lock);
520
521 if (iscsi_login_set_conn_values(sess, conn, pdu->cid) < 0 ||
522 iscsi_copy_param_list(&conn->param_list,
523 conn->tpg->param_list, 0) < 0) {
524 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
525 ISCSI_LOGIN_STATUS_NO_RESOURCES);
526 return -1;
527 }
528
529 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
530 iser = true;
531
532 iscsi_set_keys_to_negotiate(conn->param_list, iser);
533 /*
534 * Need to send TargetPortalGroupTag back in first login response
535 * on any iSCSI connection where the Initiator provides TargetName.
536 * See 5.3.1. Login Phase Start
537 *
538 * In our case, we have already located the struct iscsi_tiqn at this point.
539 */
540 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
541 return -1;
542
543 return 0;
544 }
545
546 int iscsi_login_post_auth_non_zero_tsih(
547 struct iscsi_conn *conn,
548 u16 cid,
549 u32 exp_statsn)
550 {
551 struct iscsi_conn *conn_ptr = NULL;
552 struct iscsi_conn_recovery *cr = NULL;
553 struct iscsi_session *sess = conn->sess;
554
555 /*
556 * By following item 5 in the login table, if we have found
557 * an existing ISID and a valid/existing TSIH and an existing
558 * CID we do connection reinstatement. Currently we dont not
559 * support it so we send back an non-zero status class to the
560 * initiator and release the new connection.
561 */
562 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
563 if (conn_ptr) {
564 pr_err("Connection exists with CID %hu for %s,"
565 " performing connection reinstatement.\n",
566 conn_ptr->cid, sess->sess_ops->InitiatorName);
567
568 iscsit_connection_reinstatement_rcfr(conn_ptr);
569 iscsit_dec_conn_usage_count(conn_ptr);
570 }
571
572 /*
573 * Check for any connection recovery entries containing CID.
574 * We use the original ExpStatSN sent in the first login request
575 * to acknowledge commands for the failed connection.
576 *
577 * Also note that an explict logout may have already been sent,
578 * but the response may not be sent due to additional connection
579 * loss.
580 */
581 if (sess->sess_ops->ErrorRecoveryLevel == 2) {
582 cr = iscsit_get_inactive_connection_recovery_entry(
583 sess, cid);
584 if (cr) {
585 pr_debug("Performing implicit logout"
586 " for connection recovery on CID: %hu\n",
587 conn->cid);
588 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
589 }
590 }
591
592 /*
593 * Else we follow item 4 from the login table in that we have
594 * found an existing ISID and a valid/existing TSIH and a new
595 * CID we go ahead and continue to add a new connection to the
596 * session.
597 */
598 pr_debug("Adding CID %hu to existing session for %s.\n",
599 cid, sess->sess_ops->InitiatorName);
600
601 if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
602 pr_err("Adding additional connection to this session"
603 " would exceed MaxConnections %d, login failed.\n",
604 sess->sess_ops->MaxConnections);
605 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
606 ISCSI_LOGIN_STATUS_ISID_ERROR);
607 return -1;
608 }
609
610 return 0;
611 }
612
613 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
614 {
615 struct iscsi_session *sess = conn->sess;
616 /*
617 * FIXME: Unsolicited NopIN support for ISER
618 */
619 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
620 return;
621
622 if (!sess->sess_ops->SessionType)
623 iscsit_start_nopin_timer(conn);
624 }
625
626 int iscsit_start_kthreads(struct iscsi_conn *conn)
627 {
628 int ret = 0;
629
630 spin_lock(&iscsit_global->ts_bitmap_lock);
631 conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
632 ISCSIT_BITMAP_BITS, get_order(1));
633 spin_unlock(&iscsit_global->ts_bitmap_lock);
634
635 if (conn->bitmap_id < 0) {
636 pr_err("bitmap_find_free_region() failed for"
637 " iscsit_start_kthreads()\n");
638 return -ENOMEM;
639 }
640
641 conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
642 "%s", ISCSI_TX_THREAD_NAME);
643 if (IS_ERR(conn->tx_thread)) {
644 pr_err("Unable to start iscsi_target_tx_thread\n");
645 ret = PTR_ERR(conn->tx_thread);
646 goto out_bitmap;
647 }
648 conn->tx_thread_active = true;
649
650 conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
651 "%s", ISCSI_RX_THREAD_NAME);
652 if (IS_ERR(conn->rx_thread)) {
653 pr_err("Unable to start iscsi_target_rx_thread\n");
654 ret = PTR_ERR(conn->rx_thread);
655 goto out_tx;
656 }
657 conn->rx_thread_active = true;
658
659 return 0;
660 out_tx:
661 send_sig(SIGINT, conn->tx_thread, 1);
662 kthread_stop(conn->tx_thread);
663 conn->tx_thread_active = false;
664 out_bitmap:
665 spin_lock(&iscsit_global->ts_bitmap_lock);
666 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
667 get_order(1));
668 spin_unlock(&iscsit_global->ts_bitmap_lock);
669 return ret;
670 }
671
672 void iscsi_post_login_handler(
673 struct iscsi_np *np,
674 struct iscsi_conn *conn,
675 u8 zero_tsih)
676 {
677 int stop_timer = 0;
678 struct iscsi_session *sess = conn->sess;
679 struct se_session *se_sess = sess->se_sess;
680 struct iscsi_portal_group *tpg = sess->tpg;
681 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
682
683 iscsit_inc_conn_usage_count(conn);
684
685 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
686 ISCSI_LOGIN_STATUS_ACCEPT);
687
688 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
689 conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
690
691 iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
692 /*
693 * SCSI Initiator -> SCSI Target Port Mapping
694 */
695 if (!zero_tsih) {
696 iscsi_set_session_parameters(sess->sess_ops,
697 conn->param_list, 0);
698 iscsi_release_param_list(conn->param_list);
699 conn->param_list = NULL;
700
701 spin_lock_bh(&sess->conn_lock);
702 atomic_set(&sess->session_continuation, 0);
703 if (sess->session_state == TARG_SESS_STATE_FAILED) {
704 pr_debug("Moving to"
705 " TARG_SESS_STATE_LOGGED_IN.\n");
706 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
707 stop_timer = 1;
708 }
709
710 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"
711 " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
712 &conn->local_sockaddr, tpg->tpgt);
713
714 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
715 atomic_inc(&sess->nconn);
716 pr_debug("Incremented iSCSI Connection count to %hu"
717 " from node: %s\n", atomic_read(&sess->nconn),
718 sess->sess_ops->InitiatorName);
719 spin_unlock_bh(&sess->conn_lock);
720
721 iscsi_post_login_start_timers(conn);
722 /*
723 * Determine CPU mask to ensure connection's RX and TX kthreads
724 * are scheduled on the same CPU.
725 */
726 iscsit_thread_get_cpumask(conn);
727 conn->conn_rx_reset_cpumask = 1;
728 conn->conn_tx_reset_cpumask = 1;
729 /*
730 * Wakeup the sleeping iscsi_target_rx_thread() now that
731 * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
732 */
733 complete(&conn->rx_login_comp);
734 iscsit_dec_conn_usage_count(conn);
735
736 if (stop_timer) {
737 spin_lock_bh(&se_tpg->session_lock);
738 iscsit_stop_time2retain_timer(sess);
739 spin_unlock_bh(&se_tpg->session_lock);
740 }
741 iscsit_dec_session_usage_count(sess);
742 return;
743 }
744
745 iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
746 iscsi_release_param_list(conn->param_list);
747 conn->param_list = NULL;
748
749 iscsit_determine_maxcmdsn(sess);
750
751 spin_lock_bh(&se_tpg->session_lock);
752 __transport_register_session(&sess->tpg->tpg_se_tpg,
753 se_sess->se_node_acl, se_sess, sess);
754 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
755 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
756
757 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
758 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
759 tpg->tpgt);
760
761 spin_lock_bh(&sess->conn_lock);
762 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
763 atomic_inc(&sess->nconn);
764 pr_debug("Incremented iSCSI Connection count to %hu from node:"
765 " %s\n", atomic_read(&sess->nconn),
766 sess->sess_ops->InitiatorName);
767 spin_unlock_bh(&sess->conn_lock);
768
769 sess->sid = tpg->sid++;
770 if (!sess->sid)
771 sess->sid = tpg->sid++;
772 pr_debug("Established iSCSI session from node: %s\n",
773 sess->sess_ops->InitiatorName);
774
775 tpg->nsessions++;
776 if (tpg->tpg_tiqn)
777 tpg->tpg_tiqn->tiqn_nsessions++;
778
779 pr_debug("Incremented number of active iSCSI sessions to %u on"
780 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
781 spin_unlock_bh(&se_tpg->session_lock);
782
783 iscsi_post_login_start_timers(conn);
784 /*
785 * Determine CPU mask to ensure connection's RX and TX kthreads
786 * are scheduled on the same CPU.
787 */
788 iscsit_thread_get_cpumask(conn);
789 conn->conn_rx_reset_cpumask = 1;
790 conn->conn_tx_reset_cpumask = 1;
791 /*
792 * Wakeup the sleeping iscsi_target_rx_thread() now that
793 * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
794 */
795 complete(&conn->rx_login_comp);
796 iscsit_dec_conn_usage_count(conn);
797 }
798
799 void iscsi_handle_login_thread_timeout(struct timer_list *t)
800 {
801 struct iscsi_np *np = from_timer(np, t, np_login_timer);
802
803 spin_lock_bh(&np->np_thread_lock);
804 pr_err("iSCSI Login timeout on Network Portal %pISpc\n",
805 &np->np_sockaddr);
806
807 if (np->np_login_timer_flags & ISCSI_TF_STOP) {
808 spin_unlock_bh(&np->np_thread_lock);
809 return;
810 }
811
812 if (np->np_thread)
813 send_sig(SIGINT, np->np_thread, 1);
814
815 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
816 spin_unlock_bh(&np->np_thread_lock);
817 }
818
819 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
820 {
821 /*
822 * This used the TA_LOGIN_TIMEOUT constant because at this
823 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
824 */
825 spin_lock_bh(&np->np_thread_lock);
826 np->np_login_timer_flags &= ~ISCSI_TF_STOP;
827 np->np_login_timer_flags |= ISCSI_TF_RUNNING;
828 mod_timer(&np->np_login_timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
829
830 pr_debug("Added timeout timer to iSCSI login request for"
831 " %u seconds.\n", TA_LOGIN_TIMEOUT);
832 spin_unlock_bh(&np->np_thread_lock);
833 }
834
835 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
836 {
837 spin_lock_bh(&np->np_thread_lock);
838 if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
839 spin_unlock_bh(&np->np_thread_lock);
840 return;
841 }
842 np->np_login_timer_flags |= ISCSI_TF_STOP;
843 spin_unlock_bh(&np->np_thread_lock);
844
845 del_timer_sync(&np->np_login_timer);
846
847 spin_lock_bh(&np->np_thread_lock);
848 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
849 spin_unlock_bh(&np->np_thread_lock);
850 }
851
852 int iscsit_setup_np(
853 struct iscsi_np *np,
854 struct sockaddr_storage *sockaddr)
855 {
856 struct socket *sock = NULL;
857 int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
858
859 switch (np->np_network_transport) {
860 case ISCSI_TCP:
861 np->np_ip_proto = IPPROTO_TCP;
862 np->np_sock_type = SOCK_STREAM;
863 break;
864 case ISCSI_SCTP_TCP:
865 np->np_ip_proto = IPPROTO_SCTP;
866 np->np_sock_type = SOCK_STREAM;
867 break;
868 case ISCSI_SCTP_UDP:
869 np->np_ip_proto = IPPROTO_SCTP;
870 np->np_sock_type = SOCK_SEQPACKET;
871 break;
872 default:
873 pr_err("Unsupported network_transport: %d\n",
874 np->np_network_transport);
875 return -EINVAL;
876 }
877
878 ret = sock_create(sockaddr->ss_family, np->np_sock_type,
879 np->np_ip_proto, &sock);
880 if (ret < 0) {
881 pr_err("sock_create() failed.\n");
882 return ret;
883 }
884 np->np_socket = sock;
885 /*
886 * Setup the np->np_sockaddr from the passed sockaddr setup
887 * in iscsi_target_configfs.c code..
888 */
889 memcpy(&np->np_sockaddr, sockaddr,
890 sizeof(struct sockaddr_storage));
891
892 if (sockaddr->ss_family == AF_INET6)
893 len = sizeof(struct sockaddr_in6);
894 else
895 len = sizeof(struct sockaddr_in);
896 /*
897 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
898 */
899 /* FIXME: Someone please explain why this is endian-safe */
900 opt = 1;
901 if (np->np_network_transport == ISCSI_TCP) {
902 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
903 (char *)&opt, sizeof(opt));
904 if (ret < 0) {
905 pr_err("kernel_setsockopt() for TCP_NODELAY"
906 " failed: %d\n", ret);
907 goto fail;
908 }
909 }
910
911 /* FIXME: Someone please explain why this is endian-safe */
912 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
913 (char *)&opt, sizeof(opt));
914 if (ret < 0) {
915 pr_err("kernel_setsockopt() for SO_REUSEADDR"
916 " failed\n");
917 goto fail;
918 }
919
920 ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
921 (char *)&opt, sizeof(opt));
922 if (ret < 0) {
923 pr_err("kernel_setsockopt() for IP_FREEBIND"
924 " failed\n");
925 goto fail;
926 }
927
928 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
929 if (ret < 0) {
930 pr_err("kernel_bind() failed: %d\n", ret);
931 goto fail;
932 }
933
934 ret = kernel_listen(sock, backlog);
935 if (ret != 0) {
936 pr_err("kernel_listen() failed: %d\n", ret);
937 goto fail;
938 }
939
940 return 0;
941 fail:
942 np->np_socket = NULL;
943 sock_release(sock);
944 return ret;
945 }
946
947 int iscsi_target_setup_login_socket(
948 struct iscsi_np *np,
949 struct sockaddr_storage *sockaddr)
950 {
951 struct iscsit_transport *t;
952 int rc;
953
954 t = iscsit_get_transport(np->np_network_transport);
955 if (!t)
956 return -EINVAL;
957
958 rc = t->iscsit_setup_np(np, sockaddr);
959 if (rc < 0) {
960 iscsit_put_transport(t);
961 return rc;
962 }
963
964 np->np_transport = t;
965 np->enabled = true;
966 return 0;
967 }
968
969 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
970 {
971 struct socket *new_sock, *sock = np->np_socket;
972 struct sockaddr_in sock_in;
973 struct sockaddr_in6 sock_in6;
974 int rc;
975
976 rc = kernel_accept(sock, &new_sock, 0);
977 if (rc < 0)
978 return rc;
979
980 conn->sock = new_sock;
981 conn->login_family = np->np_sockaddr.ss_family;
982
983 if (np->np_sockaddr.ss_family == AF_INET6) {
984 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
985
986 rc = conn->sock->ops->getname(conn->sock,
987 (struct sockaddr *)&sock_in6, 1);
988 if (rc >= 0) {
989 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
990 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
991 } else {
992 /* Pretend to be an ipv4 socket */
993 sock_in.sin_family = AF_INET;
994 sock_in.sin_port = sock_in6.sin6_port;
995 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
996 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
997 }
998 }
999
1000 rc = conn->sock->ops->getname(conn->sock,
1001 (struct sockaddr *)&sock_in6, 0);
1002 if (rc >= 0) {
1003 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1004 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
1005 } else {
1006 /* Pretend to be an ipv4 socket */
1007 sock_in.sin_family = AF_INET;
1008 sock_in.sin_port = sock_in6.sin6_port;
1009 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1010 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1011 }
1012 }
1013 } else {
1014 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1015
1016 rc = conn->sock->ops->getname(conn->sock,
1017 (struct sockaddr *)&sock_in, 1);
1018 if (rc >= 0)
1019 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1020
1021 rc = conn->sock->ops->getname(conn->sock,
1022 (struct sockaddr *)&sock_in, 0);
1023 if (rc >= 0)
1024 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1025 }
1026
1027 return 0;
1028 }
1029
1030 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1031 {
1032 struct iscsi_login_req *login_req;
1033 u32 padding = 0, payload_length;
1034
1035 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1036 return -1;
1037
1038 login_req = (struct iscsi_login_req *)login->req;
1039 payload_length = ntoh24(login_req->dlength);
1040 padding = ((-payload_length) & 3);
1041
1042 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1043 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1044 login_req->flags, login_req->itt, login_req->cmdsn,
1045 login_req->exp_statsn, login_req->cid, payload_length);
1046 /*
1047 * Setup the initial iscsi_login values from the leading
1048 * login request PDU.
1049 */
1050 if (login->first_request) {
1051 login_req = (struct iscsi_login_req *)login->req;
1052 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1053 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1054 login->version_min = login_req->min_version;
1055 login->version_max = login_req->max_version;
1056 memcpy(login->isid, login_req->isid, 6);
1057 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1058 login->init_task_tag = login_req->itt;
1059 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1060 login->cid = be16_to_cpu(login_req->cid);
1061 login->tsih = be16_to_cpu(login_req->tsih);
1062 }
1063
1064 if (iscsi_target_check_login_request(conn, login) < 0)
1065 return -1;
1066
1067 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1068 if (iscsi_login_rx_data(conn, login->req_buf,
1069 payload_length + padding) < 0)
1070 return -1;
1071
1072 return 0;
1073 }
1074
1075 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1076 u32 length)
1077 {
1078 if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1079 return -1;
1080
1081 return 0;
1082 }
1083
1084 static int
1085 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1086 {
1087 int rc;
1088
1089 if (!t->owner) {
1090 conn->conn_transport = t;
1091 return 0;
1092 }
1093
1094 rc = try_module_get(t->owner);
1095 if (!rc) {
1096 pr_err("try_module_get() failed for %s\n", t->name);
1097 return -EINVAL;
1098 }
1099
1100 conn->conn_transport = t;
1101 return 0;
1102 }
1103
1104 static struct iscsi_conn *iscsit_alloc_conn(struct iscsi_np *np)
1105 {
1106 struct iscsi_conn *conn;
1107
1108 conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1109 if (!conn) {
1110 pr_err("Could not allocate memory for new connection\n");
1111 return NULL;
1112 }
1113 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1114 conn->conn_state = TARG_CONN_STATE_FREE;
1115
1116 init_waitqueue_head(&conn->queues_wq);
1117 INIT_LIST_HEAD(&conn->conn_list);
1118 INIT_LIST_HEAD(&conn->conn_cmd_list);
1119 INIT_LIST_HEAD(&conn->immed_queue_list);
1120 INIT_LIST_HEAD(&conn->response_queue_list);
1121 init_completion(&conn->conn_post_wait_comp);
1122 init_completion(&conn->conn_wait_comp);
1123 init_completion(&conn->conn_wait_rcfr_comp);
1124 init_completion(&conn->conn_waiting_on_uc_comp);
1125 init_completion(&conn->conn_logout_comp);
1126 init_completion(&conn->rx_half_close_comp);
1127 init_completion(&conn->tx_half_close_comp);
1128 init_completion(&conn->rx_login_comp);
1129 spin_lock_init(&conn->cmd_lock);
1130 spin_lock_init(&conn->conn_usage_lock);
1131 spin_lock_init(&conn->immed_queue_lock);
1132 spin_lock_init(&conn->nopin_timer_lock);
1133 spin_lock_init(&conn->response_queue_lock);
1134 spin_lock_init(&conn->state_lock);
1135
1136 timer_setup(&conn->nopin_response_timer,
1137 iscsit_handle_nopin_response_timeout, 0);
1138 timer_setup(&conn->nopin_timer, iscsit_handle_nopin_timeout, 0);
1139
1140 if (iscsit_conn_set_transport(conn, np->np_transport) < 0)
1141 goto free_conn;
1142
1143 conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
1144 if (!conn->conn_ops) {
1145 pr_err("Unable to allocate memory for struct iscsi_conn_ops.\n");
1146 goto put_transport;
1147 }
1148
1149 if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
1150 pr_err("Unable to allocate conn->conn_cpumask\n");
1151 goto free_conn_ops;
1152 }
1153
1154 return conn;
1155
1156 free_conn_ops:
1157 kfree(conn->conn_ops);
1158 put_transport:
1159 iscsit_put_transport(conn->conn_transport);
1160 free_conn:
1161 kfree(conn);
1162 return NULL;
1163 }
1164
1165 void iscsit_free_conn(struct iscsi_conn *conn)
1166 {
1167 free_cpumask_var(conn->conn_cpumask);
1168 kfree(conn->conn_ops);
1169 iscsit_put_transport(conn->conn_transport);
1170 kfree(conn);
1171 }
1172
1173 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1174 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1175 {
1176 if (!new_sess)
1177 goto old_sess_out;
1178
1179 pr_err("iSCSI Login negotiation failed.\n");
1180 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1181 ISCSI_LOGIN_STATUS_INIT_ERR);
1182 if (!zero_tsih || !conn->sess)
1183 goto old_sess_out;
1184
1185 transport_free_session(conn->sess->se_sess);
1186 ida_free(&sess_ida, conn->sess->session_index);
1187 kfree(conn->sess->sess_ops);
1188 kfree(conn->sess);
1189 conn->sess = NULL;
1190
1191 old_sess_out:
1192 iscsi_stop_login_thread_timer(np);
1193 /*
1194 * If login negotiation fails check if the Time2Retain timer
1195 * needs to be restarted.
1196 */
1197 if (!zero_tsih && conn->sess) {
1198 spin_lock_bh(&conn->sess->conn_lock);
1199 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1200 struct se_portal_group *se_tpg =
1201 &conn->tpg->tpg_se_tpg;
1202
1203 atomic_set(&conn->sess->session_continuation, 0);
1204 spin_unlock_bh(&conn->sess->conn_lock);
1205 spin_lock_bh(&se_tpg->session_lock);
1206 iscsit_start_time2retain_handler(conn->sess);
1207 spin_unlock_bh(&se_tpg->session_lock);
1208 } else
1209 spin_unlock_bh(&conn->sess->conn_lock);
1210 iscsit_dec_session_usage_count(conn->sess);
1211 }
1212
1213 ahash_request_free(conn->conn_tx_hash);
1214 if (conn->conn_rx_hash) {
1215 struct crypto_ahash *tfm;
1216
1217 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
1218 ahash_request_free(conn->conn_rx_hash);
1219 crypto_free_ahash(tfm);
1220 }
1221
1222 if (conn->param_list) {
1223 iscsi_release_param_list(conn->param_list);
1224 conn->param_list = NULL;
1225 }
1226 iscsi_target_nego_release(conn);
1227
1228 if (conn->sock) {
1229 sock_release(conn->sock);
1230 conn->sock = NULL;
1231 }
1232
1233 if (conn->conn_transport->iscsit_wait_conn)
1234 conn->conn_transport->iscsit_wait_conn(conn);
1235
1236 if (conn->conn_transport->iscsit_free_conn)
1237 conn->conn_transport->iscsit_free_conn(conn);
1238
1239 iscsit_free_conn(conn);
1240 }
1241
1242 static int __iscsi_target_login_thread(struct iscsi_np *np)
1243 {
1244 u8 *buffer, zero_tsih = 0;
1245 int ret = 0, rc;
1246 struct iscsi_conn *conn = NULL;
1247 struct iscsi_login *login;
1248 struct iscsi_portal_group *tpg = NULL;
1249 struct iscsi_login_req *pdu;
1250 struct iscsi_tpg_np *tpg_np;
1251 bool new_sess = false;
1252
1253 flush_signals(current);
1254
1255 spin_lock_bh(&np->np_thread_lock);
1256 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1257 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1258 spin_unlock_bh(&np->np_thread_lock);
1259 complete(&np->np_restart_comp);
1260 return 1;
1261 } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1262 spin_unlock_bh(&np->np_thread_lock);
1263 goto exit;
1264 } else {
1265 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1266 }
1267 spin_unlock_bh(&np->np_thread_lock);
1268
1269 conn = iscsit_alloc_conn(np);
1270 if (!conn) {
1271 /* Get another socket */
1272 return 1;
1273 }
1274
1275 rc = np->np_transport->iscsit_accept_np(np, conn);
1276 if (rc == -ENOSYS) {
1277 complete(&np->np_restart_comp);
1278 iscsit_free_conn(conn);
1279 goto exit;
1280 } else if (rc < 0) {
1281 spin_lock_bh(&np->np_thread_lock);
1282 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1283 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1284 spin_unlock_bh(&np->np_thread_lock);
1285 complete(&np->np_restart_comp);
1286 iscsit_free_conn(conn);
1287 /* Get another socket */
1288 return 1;
1289 }
1290 spin_unlock_bh(&np->np_thread_lock);
1291 iscsit_free_conn(conn);
1292 return 1;
1293 }
1294 /*
1295 * Perform the remaining iSCSI connection initialization items..
1296 */
1297 login = iscsi_login_init_conn(conn);
1298 if (!login) {
1299 goto new_sess_out;
1300 }
1301
1302 iscsi_start_login_thread_timer(np);
1303
1304 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1305 conn->conn_state = TARG_CONN_STATE_XPT_UP;
1306 /*
1307 * This will process the first login request + payload..
1308 */
1309 rc = np->np_transport->iscsit_get_login_rx(conn, login);
1310 if (rc == 1)
1311 return 1;
1312 else if (rc < 0)
1313 goto new_sess_out;
1314
1315 buffer = &login->req[0];
1316 pdu = (struct iscsi_login_req *)buffer;
1317 /*
1318 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1319 * when Status-Class != 0.
1320 */
1321 conn->login_itt = pdu->itt;
1322
1323 spin_lock_bh(&np->np_thread_lock);
1324 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1325 spin_unlock_bh(&np->np_thread_lock);
1326 pr_err("iSCSI Network Portal on %pISpc currently not"
1327 " active.\n", &np->np_sockaddr);
1328 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1329 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1330 goto new_sess_out;
1331 }
1332 spin_unlock_bh(&np->np_thread_lock);
1333
1334 conn->network_transport = np->np_network_transport;
1335
1336 pr_debug("Received iSCSI login request from %pISpc on %s Network"
1337 " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name,
1338 &conn->local_sockaddr);
1339
1340 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1341 conn->conn_state = TARG_CONN_STATE_IN_LOGIN;
1342
1343 if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1344 pdu->min_version) < 0)
1345 goto new_sess_out;
1346
1347 zero_tsih = (pdu->tsih == 0x0000);
1348 if (zero_tsih) {
1349 /*
1350 * This is the leading connection of a new session.
1351 * We wait until after authentication to check for
1352 * session reinstatement.
1353 */
1354 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1355 goto new_sess_out;
1356 } else {
1357 /*
1358 * Add a new connection to an existing session.
1359 * We check for a non-existant session in
1360 * iscsi_login_non_zero_tsih_s2() below based
1361 * on ISID/TSIH, but wait until after authentication
1362 * to check for connection reinstatement, etc.
1363 */
1364 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1365 goto new_sess_out;
1366 }
1367 /*
1368 * SessionType: Discovery
1369 *
1370 * Locates Default Portal
1371 *
1372 * SessionType: Normal
1373 *
1374 * Locates Target Portal from NP -> Target IQN
1375 */
1376 rc = iscsi_target_locate_portal(np, conn, login);
1377 if (rc < 0) {
1378 tpg = conn->tpg;
1379 goto new_sess_out;
1380 }
1381 login->zero_tsih = zero_tsih;
1382
1383 if (conn->sess)
1384 conn->sess->se_sess->sup_prot_ops =
1385 conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1386
1387 tpg = conn->tpg;
1388 if (!tpg) {
1389 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1390 goto new_sess_out;
1391 }
1392
1393 if (zero_tsih) {
1394 if (iscsi_login_zero_tsih_s2(conn) < 0)
1395 goto new_sess_out;
1396 } else {
1397 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1398 goto old_sess_out;
1399 }
1400
1401 if (conn->conn_transport->iscsit_validate_params) {
1402 ret = conn->conn_transport->iscsit_validate_params(conn);
1403 if (ret < 0) {
1404 if (zero_tsih)
1405 goto new_sess_out;
1406 else
1407 goto old_sess_out;
1408 }
1409 }
1410
1411 ret = iscsi_target_start_negotiation(login, conn);
1412 if (ret < 0)
1413 goto new_sess_out;
1414
1415 iscsi_stop_login_thread_timer(np);
1416
1417 if (ret == 1) {
1418 tpg_np = conn->tpg_np;
1419
1420 iscsi_post_login_handler(np, conn, zero_tsih);
1421 iscsit_deaccess_np(np, tpg, tpg_np);
1422 }
1423
1424 tpg = NULL;
1425 tpg_np = NULL;
1426 /* Get another socket */
1427 return 1;
1428
1429 new_sess_out:
1430 new_sess = true;
1431 old_sess_out:
1432 tpg_np = conn->tpg_np;
1433 iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1434 new_sess = false;
1435
1436 if (tpg) {
1437 iscsit_deaccess_np(np, tpg, tpg_np);
1438 tpg = NULL;
1439 tpg_np = NULL;
1440 }
1441
1442 return 1;
1443
1444 exit:
1445 iscsi_stop_login_thread_timer(np);
1446 spin_lock_bh(&np->np_thread_lock);
1447 np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1448 spin_unlock_bh(&np->np_thread_lock);
1449
1450 return 0;
1451 }
1452
1453 int iscsi_target_login_thread(void *arg)
1454 {
1455 struct iscsi_np *np = arg;
1456 int ret;
1457
1458 allow_signal(SIGINT);
1459
1460 while (1) {
1461 ret = __iscsi_target_login_thread(np);
1462 /*
1463 * We break and exit here unless another sock_accept() call
1464 * is expected.
1465 */
1466 if (ret != 1)
1467 break;
1468 }
1469
1470 while (!kthread_should_stop()) {
1471 msleep(100);
1472 }
1473
1474 return 0;
1475 }
Linux with added FPC-III support