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