1 /*******************************************************************************
2 * This file contains main functions related to iSCSI Parameter negotiation.
4 * (c) Copyright 2007-2013 Datera, Inc.
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
19 #include <linux/ctype.h>
20 #include <linux/kthread.h>
21 #include <scsi/iscsi_proto.h>
22 #include <target/target_core_base.h>
23 #include <target/target_core_fabric.h>
24 #include <target/iscsi/iscsi_transport.h>
26 #include <target/iscsi/iscsi_target_core.h>
27 #include "iscsi_target_parameters.h"
28 #include "iscsi_target_login.h"
29 #include "iscsi_target_nego.h"
30 #include "iscsi_target_tpg.h"
31 #include "iscsi_target_util.h"
32 #include "iscsi_target.h"
33 #include "iscsi_target_auth.h"
35 #define MAX_LOGIN_PDUS 7
38 void convert_null_to_semi(char *buf
, int len
)
42 for (i
= 0; i
< len
; i
++)
47 static int strlen_semi(char *buf
)
51 while (buf
[i
] != '\0') {
63 unsigned int max_length
,
70 if (!in_buf
|| !pattern
|| !out_buf
|| !type
)
73 ptr
= strstr(in_buf
, pattern
);
77 ptr
= strstr(ptr
, "=");
82 if (*ptr
== '0' && (*(ptr
+1) == 'x' || *(ptr
+1) == 'X')) {
83 ptr
+= 2; /* skip 0x */
88 len
= strlen_semi(ptr
);
92 if (len
>= max_length
) {
93 pr_err("Length of input: %d exceeds max_length:"
94 " %d\n", len
, max_length
);
97 memcpy(out_buf
, ptr
, len
);
103 static u32
iscsi_handle_authentication(
104 struct iscsi_conn
*conn
,
109 unsigned char *authtype
)
111 struct iscsi_session
*sess
= conn
->sess
;
112 struct iscsi_node_auth
*auth
;
113 struct iscsi_node_acl
*iscsi_nacl
;
114 struct iscsi_portal_group
*iscsi_tpg
;
115 struct se_node_acl
*se_nacl
;
117 if (!sess
->sess_ops
->SessionType
) {
119 * For SessionType=Normal
121 se_nacl
= conn
->sess
->se_sess
->se_node_acl
;
123 pr_err("Unable to locate struct se_node_acl for"
127 iscsi_nacl
= container_of(se_nacl
, struct iscsi_node_acl
,
130 pr_err("Unable to locate struct iscsi_node_acl for"
135 if (se_nacl
->dynamic_node_acl
) {
136 iscsi_tpg
= container_of(se_nacl
->se_tpg
,
137 struct iscsi_portal_group
, tpg_se_tpg
);
139 auth
= &iscsi_tpg
->tpg_demo_auth
;
141 iscsi_nacl
= container_of(se_nacl
, struct iscsi_node_acl
,
144 auth
= &iscsi_nacl
->node_auth
;
148 * For SessionType=Discovery
150 auth
= &iscsit_global
->discovery_acl
.node_auth
;
153 if (strstr("CHAP", authtype
))
154 strcpy(conn
->sess
->auth_type
, "CHAP");
156 strcpy(conn
->sess
->auth_type
, NONE
);
158 if (strstr("None", authtype
))
161 else if (strstr("SRP", authtype
))
162 return srp_main_loop(conn
, auth
, in_buf
, out_buf
,
163 &in_length
, out_length
);
165 else if (strstr("CHAP", authtype
))
166 return chap_main_loop(conn
, auth
, in_buf
, out_buf
,
167 &in_length
, out_length
);
168 else if (strstr("SPKM1", authtype
))
170 else if (strstr("SPKM2", authtype
))
172 else if (strstr("KRB5", authtype
))
178 static void iscsi_remove_failed_auth_entry(struct iscsi_conn
*conn
)
180 kfree(conn
->auth_protocol
);
183 int iscsi_target_check_login_request(
184 struct iscsi_conn
*conn
,
185 struct iscsi_login
*login
)
187 int req_csg
, req_nsg
;
189 struct iscsi_login_req
*login_req
;
191 login_req
= (struct iscsi_login_req
*) login
->req
;
192 payload_length
= ntoh24(login_req
->dlength
);
194 switch (login_req
->opcode
& ISCSI_OPCODE_MASK
) {
198 pr_err("Received unknown opcode 0x%02x.\n",
199 login_req
->opcode
& ISCSI_OPCODE_MASK
);
200 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
201 ISCSI_LOGIN_STATUS_INIT_ERR
);
205 if ((login_req
->flags
& ISCSI_FLAG_LOGIN_CONTINUE
) &&
206 (login_req
->flags
& ISCSI_FLAG_LOGIN_TRANSIT
)) {
207 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
208 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
209 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
210 ISCSI_LOGIN_STATUS_INIT_ERR
);
214 req_csg
= ISCSI_LOGIN_CURRENT_STAGE(login_req
->flags
);
215 req_nsg
= ISCSI_LOGIN_NEXT_STAGE(login_req
->flags
);
217 if (req_csg
!= login
->current_stage
) {
218 pr_err("Initiator unexpectedly changed login stage"
219 " from %d to %d, login failed.\n", login
->current_stage
,
221 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
222 ISCSI_LOGIN_STATUS_INIT_ERR
);
226 if ((req_nsg
== 2) || (req_csg
>= 2) ||
227 ((login_req
->flags
& ISCSI_FLAG_LOGIN_TRANSIT
) &&
228 (req_nsg
<= req_csg
))) {
229 pr_err("Illegal login_req->flags Combination, CSG: %d,"
230 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg
,
231 req_nsg
, (login_req
->flags
& ISCSI_FLAG_LOGIN_TRANSIT
));
232 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
233 ISCSI_LOGIN_STATUS_INIT_ERR
);
237 if ((login_req
->max_version
!= login
->version_max
) ||
238 (login_req
->min_version
!= login
->version_min
)) {
239 pr_err("Login request changed Version Max/Nin"
240 " unexpectedly to 0x%02x/0x%02x, protocol error\n",
241 login_req
->max_version
, login_req
->min_version
);
242 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
243 ISCSI_LOGIN_STATUS_INIT_ERR
);
247 if (memcmp(login_req
->isid
, login
->isid
, 6) != 0) {
248 pr_err("Login request changed ISID unexpectedly,"
249 " protocol error.\n");
250 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
251 ISCSI_LOGIN_STATUS_INIT_ERR
);
255 if (login_req
->itt
!= login
->init_task_tag
) {
256 pr_err("Login request changed ITT unexpectedly to"
257 " 0x%08x, protocol error.\n", login_req
->itt
);
258 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
259 ISCSI_LOGIN_STATUS_INIT_ERR
);
263 if (payload_length
> MAX_KEY_VALUE_PAIRS
) {
264 pr_err("Login request payload exceeds default"
265 " MaxRecvDataSegmentLength: %u, protocol error.\n",
266 MAX_KEY_VALUE_PAIRS
);
273 static int iscsi_target_check_first_request(
274 struct iscsi_conn
*conn
,
275 struct iscsi_login
*login
)
277 struct iscsi_param
*param
= NULL
;
278 struct se_node_acl
*se_nacl
;
280 login
->first_request
= 0;
282 list_for_each_entry(param
, &conn
->param_list
->param_list
, p_list
) {
283 if (!strncmp(param
->name
, SESSIONTYPE
, 11)) {
284 if (!IS_PSTATE_ACCEPTOR(param
)) {
285 pr_err("SessionType key not received"
286 " in first login request.\n");
287 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
288 ISCSI_LOGIN_STATUS_MISSING_FIELDS
);
291 if (!strncmp(param
->value
, DISCOVERY
, 9))
295 if (!strncmp(param
->name
, INITIATORNAME
, 13)) {
296 if (!IS_PSTATE_ACCEPTOR(param
)) {
297 if (!login
->leading_connection
)
300 pr_err("InitiatorName key not received"
301 " in first login request.\n");
302 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
303 ISCSI_LOGIN_STATUS_MISSING_FIELDS
);
308 * For non-leading connections, double check that the
309 * received InitiatorName matches the existing session's
310 * struct iscsi_node_acl.
312 if (!login
->leading_connection
) {
313 se_nacl
= conn
->sess
->se_sess
->se_node_acl
;
315 pr_err("Unable to locate"
316 " struct se_node_acl\n");
317 iscsit_tx_login_rsp(conn
,
318 ISCSI_STATUS_CLS_INITIATOR_ERR
,
319 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND
);
323 if (strcmp(param
->value
,
324 se_nacl
->initiatorname
)) {
326 " InitiatorName: %s for this"
327 " iSCSI Initiator Node.\n",
329 iscsit_tx_login_rsp(conn
,
330 ISCSI_STATUS_CLS_INITIATOR_ERR
,
331 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND
);
341 static int iscsi_target_do_tx_login_io(struct iscsi_conn
*conn
, struct iscsi_login
*login
)
344 struct iscsi_login_rsp
*login_rsp
;
346 login_rsp
= (struct iscsi_login_rsp
*) login
->rsp
;
348 login_rsp
->opcode
= ISCSI_OP_LOGIN_RSP
;
349 hton24(login_rsp
->dlength
, login
->rsp_length
);
350 memcpy(login_rsp
->isid
, login
->isid
, 6);
351 login_rsp
->tsih
= cpu_to_be16(login
->tsih
);
352 login_rsp
->itt
= login
->init_task_tag
;
353 login_rsp
->statsn
= cpu_to_be32(conn
->stat_sn
++);
354 login_rsp
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
355 login_rsp
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
357 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
358 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
359 " %u\n", login_rsp
->flags
, (__force u32
)login_rsp
->itt
,
360 ntohl(login_rsp
->exp_cmdsn
), ntohl(login_rsp
->max_cmdsn
),
361 ntohl(login_rsp
->statsn
), login
->rsp_length
);
363 padding
= ((-login
->rsp_length
) & 3);
365 * Before sending the last login response containing the transition
366 * bit for full-feature-phase, go ahead and start up TX/RX threads
367 * now to avoid potential resource allocation failures after the
368 * final login response has been sent.
370 if (login
->login_complete
) {
371 int rc
= iscsit_start_kthreads(conn
);
373 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
374 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
379 if (conn
->conn_transport
->iscsit_put_login_tx(conn
, login
,
380 login
->rsp_length
+ padding
) < 0)
383 login
->rsp_length
= 0;
388 if (login
->login_complete
) {
389 if (conn
->rx_thread
&& conn
->rx_thread_active
) {
390 send_sig(SIGINT
, conn
->rx_thread
, 1);
391 kthread_stop(conn
->rx_thread
);
393 if (conn
->tx_thread
&& conn
->tx_thread_active
) {
394 send_sig(SIGINT
, conn
->tx_thread
, 1);
395 kthread_stop(conn
->tx_thread
);
397 spin_lock(&iscsit_global
->ts_bitmap_lock
);
398 bitmap_release_region(iscsit_global
->ts_bitmap
, conn
->bitmap_id
,
400 spin_unlock(&iscsit_global
->ts_bitmap_lock
);
405 static void iscsi_target_sk_data_ready(struct sock
*sk
)
407 struct iscsi_conn
*conn
= sk
->sk_user_data
;
410 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn
);
412 write_lock_bh(&sk
->sk_callback_lock
);
413 if (!sk
->sk_user_data
) {
414 write_unlock_bh(&sk
->sk_callback_lock
);
417 if (!test_bit(LOGIN_FLAGS_READY
, &conn
->login_flags
)) {
418 write_unlock_bh(&sk
->sk_callback_lock
);
419 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn
);
422 if (test_bit(LOGIN_FLAGS_CLOSED
, &conn
->login_flags
)) {
423 write_unlock_bh(&sk
->sk_callback_lock
);
424 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn
);
427 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE
, &conn
->login_flags
)) {
428 write_unlock_bh(&sk
->sk_callback_lock
);
429 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn
);
433 rc
= schedule_delayed_work(&conn
->login_work
, 0);
435 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
438 write_unlock_bh(&sk
->sk_callback_lock
);
441 static void iscsi_target_sk_state_change(struct sock
*);
443 static void iscsi_target_set_sock_callbacks(struct iscsi_conn
*conn
)
451 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn
);
453 write_lock_bh(&sk
->sk_callback_lock
);
454 sk
->sk_user_data
= conn
;
455 conn
->orig_data_ready
= sk
->sk_data_ready
;
456 conn
->orig_state_change
= sk
->sk_state_change
;
457 sk
->sk_data_ready
= iscsi_target_sk_data_ready
;
458 sk
->sk_state_change
= iscsi_target_sk_state_change
;
459 write_unlock_bh(&sk
->sk_callback_lock
);
461 sk
->sk_sndtimeo
= TA_LOGIN_TIMEOUT
* HZ
;
462 sk
->sk_rcvtimeo
= TA_LOGIN_TIMEOUT
* HZ
;
465 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn
*conn
)
473 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn
);
475 write_lock_bh(&sk
->sk_callback_lock
);
476 if (!sk
->sk_user_data
) {
477 write_unlock_bh(&sk
->sk_callback_lock
);
480 sk
->sk_user_data
= NULL
;
481 sk
->sk_data_ready
= conn
->orig_data_ready
;
482 sk
->sk_state_change
= conn
->orig_state_change
;
483 write_unlock_bh(&sk
->sk_callback_lock
);
485 sk
->sk_sndtimeo
= MAX_SCHEDULE_TIMEOUT
;
486 sk
->sk_rcvtimeo
= MAX_SCHEDULE_TIMEOUT
;
489 static int iscsi_target_do_login(struct iscsi_conn
*, struct iscsi_login
*);
491 static bool iscsi_target_sk_state_check(struct sock
*sk
)
493 if (sk
->sk_state
== TCP_CLOSE_WAIT
|| sk
->sk_state
== TCP_CLOSE
) {
494 pr_debug("iscsi_target_sk_state_check: TCP_CLOSE_WAIT|TCP_CLOSE,"
495 "returning FALSE\n");
501 static void iscsi_target_login_drop(struct iscsi_conn
*conn
, struct iscsi_login
*login
)
503 struct iscsi_np
*np
= login
->np
;
504 bool zero_tsih
= login
->zero_tsih
;
506 iscsi_remove_failed_auth_entry(conn
);
507 iscsi_target_nego_release(conn
);
508 iscsi_target_login_sess_out(conn
, np
, zero_tsih
, true);
511 static void iscsi_target_login_timeout(unsigned long data
)
513 struct iscsi_conn
*conn
= (struct iscsi_conn
*)data
;
515 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
517 if (conn
->login_kworker
) {
518 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
519 conn
->login_kworker
->comm
, conn
->login_kworker
->pid
);
520 send_sig(SIGINT
, conn
->login_kworker
, 1);
524 static void iscsi_target_do_login_rx(struct work_struct
*work
)
526 struct iscsi_conn
*conn
= container_of(work
,
527 struct iscsi_conn
, login_work
.work
);
528 struct iscsi_login
*login
= conn
->login
;
529 struct iscsi_np
*np
= login
->np
;
530 struct iscsi_portal_group
*tpg
= conn
->tpg
;
531 struct iscsi_tpg_np
*tpg_np
= conn
->tpg_np
;
532 struct timer_list login_timer
;
533 int rc
, zero_tsih
= login
->zero_tsih
;
536 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
537 conn
, current
->comm
, current
->pid
);
539 spin_lock(&tpg
->tpg_state_lock
);
540 state
= (tpg
->tpg_state
== TPG_STATE_ACTIVE
);
541 spin_unlock(&tpg
->tpg_state_lock
);
544 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
545 iscsi_target_restore_sock_callbacks(conn
);
546 iscsi_target_login_drop(conn
, login
);
547 iscsit_deaccess_np(np
, tpg
, tpg_np
);
552 struct sock
*sk
= conn
->sock
->sk
;
554 read_lock_bh(&sk
->sk_callback_lock
);
555 state
= iscsi_target_sk_state_check(sk
);
556 read_unlock_bh(&sk
->sk_callback_lock
);
559 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
560 iscsi_target_restore_sock_callbacks(conn
);
561 iscsi_target_login_drop(conn
, login
);
562 iscsit_deaccess_np(np
, tpg
, tpg_np
);
567 conn
->login_kworker
= current
;
568 allow_signal(SIGINT
);
570 init_timer(&login_timer
);
571 login_timer
.expires
= (get_jiffies_64() + TA_LOGIN_TIMEOUT
* HZ
);
572 login_timer
.data
= (unsigned long)conn
;
573 login_timer
.function
= iscsi_target_login_timeout
;
574 add_timer(&login_timer
);
575 pr_debug("Starting login_timer for %s/%d\n", current
->comm
, current
->pid
);
577 rc
= conn
->conn_transport
->iscsit_get_login_rx(conn
, login
);
578 del_timer_sync(&login_timer
);
579 flush_signals(current
);
580 conn
->login_kworker
= NULL
;
583 iscsi_target_restore_sock_callbacks(conn
);
584 iscsi_target_login_drop(conn
, login
);
585 iscsit_deaccess_np(np
, tpg
, tpg_np
);
589 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
590 conn
, current
->comm
, current
->pid
);
592 rc
= iscsi_target_do_login(conn
, login
);
594 iscsi_target_restore_sock_callbacks(conn
);
595 iscsi_target_login_drop(conn
, login
);
596 iscsit_deaccess_np(np
, tpg
, tpg_np
);
599 struct sock
*sk
= conn
->sock
->sk
;
601 write_lock_bh(&sk
->sk_callback_lock
);
602 clear_bit(LOGIN_FLAGS_READ_ACTIVE
, &conn
->login_flags
);
603 write_unlock_bh(&sk
->sk_callback_lock
);
605 } else if (rc
== 1) {
606 iscsi_target_nego_release(conn
);
607 iscsi_post_login_handler(np
, conn
, zero_tsih
);
608 iscsit_deaccess_np(np
, tpg
, tpg_np
);
612 static void iscsi_target_do_cleanup(struct work_struct
*work
)
614 struct iscsi_conn
*conn
= container_of(work
,
615 struct iscsi_conn
, login_cleanup_work
.work
);
616 struct sock
*sk
= conn
->sock
->sk
;
617 struct iscsi_login
*login
= conn
->login
;
618 struct iscsi_np
*np
= login
->np
;
619 struct iscsi_portal_group
*tpg
= conn
->tpg
;
620 struct iscsi_tpg_np
*tpg_np
= conn
->tpg_np
;
622 pr_debug("Entering iscsi_target_do_cleanup\n");
624 cancel_delayed_work_sync(&conn
->login_work
);
625 conn
->orig_state_change(sk
);
627 iscsi_target_restore_sock_callbacks(conn
);
628 iscsi_target_login_drop(conn
, login
);
629 iscsit_deaccess_np(np
, tpg
, tpg_np
);
631 pr_debug("iscsi_target_do_cleanup done()\n");
634 static void iscsi_target_sk_state_change(struct sock
*sk
)
636 struct iscsi_conn
*conn
;
637 void (*orig_state_change
)(struct sock
*);
640 pr_debug("Entering iscsi_target_sk_state_change\n");
642 write_lock_bh(&sk
->sk_callback_lock
);
643 conn
= sk
->sk_user_data
;
645 write_unlock_bh(&sk
->sk_callback_lock
);
648 orig_state_change
= conn
->orig_state_change
;
650 if (!test_bit(LOGIN_FLAGS_READY
, &conn
->login_flags
)) {
651 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
653 write_unlock_bh(&sk
->sk_callback_lock
);
654 orig_state_change(sk
);
657 if (test_bit(LOGIN_FLAGS_READ_ACTIVE
, &conn
->login_flags
)) {
658 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
659 " conn: %p\n", conn
);
660 write_unlock_bh(&sk
->sk_callback_lock
);
661 orig_state_change(sk
);
664 if (test_and_set_bit(LOGIN_FLAGS_CLOSED
, &conn
->login_flags
)) {
665 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
667 write_unlock_bh(&sk
->sk_callback_lock
);
668 orig_state_change(sk
);
672 state
= iscsi_target_sk_state_check(sk
);
673 write_unlock_bh(&sk
->sk_callback_lock
);
675 pr_debug("iscsi_target_sk_state_change: state: %d\n", state
);
678 pr_debug("iscsi_target_sk_state_change got failed state\n");
679 schedule_delayed_work(&conn
->login_cleanup_work
, 0);
682 orig_state_change(sk
);
686 * NOTE: We check for existing sessions or connections AFTER the initiator
687 * has been successfully authenticated in order to protect against faked
688 * ISID/TSIH combinations.
690 static int iscsi_target_check_for_existing_instances(
691 struct iscsi_conn
*conn
,
692 struct iscsi_login
*login
)
694 if (login
->checked_for_existing
)
697 login
->checked_for_existing
= 1;
700 return iscsi_check_for_session_reinstatement(conn
);
702 return iscsi_login_post_auth_non_zero_tsih(conn
, login
->cid
,
703 login
->initial_exp_statsn
);
706 static int iscsi_target_do_authentication(
707 struct iscsi_conn
*conn
,
708 struct iscsi_login
*login
)
712 struct iscsi_param
*param
;
713 struct iscsi_login_req
*login_req
;
714 struct iscsi_login_rsp
*login_rsp
;
716 login_req
= (struct iscsi_login_req
*) login
->req
;
717 login_rsp
= (struct iscsi_login_rsp
*) login
->rsp
;
718 payload_length
= ntoh24(login_req
->dlength
);
720 param
= iscsi_find_param_from_key(AUTHMETHOD
, conn
->param_list
);
724 authret
= iscsi_handle_authentication(
733 pr_debug("Received OK response"
734 " from LIO Authentication, continuing.\n");
737 pr_debug("iSCSI security negotiation"
738 " completed successfully.\n");
739 login
->auth_complete
= 1;
740 if ((login_req
->flags
& ISCSI_FLAG_LOGIN_NEXT_STAGE1
) &&
741 (login_req
->flags
& ISCSI_FLAG_LOGIN_TRANSIT
)) {
742 login_rsp
->flags
|= (ISCSI_FLAG_LOGIN_NEXT_STAGE1
|
743 ISCSI_FLAG_LOGIN_TRANSIT
);
744 login
->current_stage
= 1;
746 return iscsi_target_check_for_existing_instances(
749 pr_err("Security negotiation"
751 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
752 ISCSI_LOGIN_STATUS_AUTH_FAILED
);
755 pr_err("Received unknown error %d from LIO"
756 " Authentication\n", authret
);
757 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
758 ISCSI_LOGIN_STATUS_TARGET_ERROR
);
765 static int iscsi_target_handle_csg_zero(
766 struct iscsi_conn
*conn
,
767 struct iscsi_login
*login
)
771 struct iscsi_param
*param
;
772 struct iscsi_login_req
*login_req
;
773 struct iscsi_login_rsp
*login_rsp
;
775 login_req
= (struct iscsi_login_req
*) login
->req
;
776 login_rsp
= (struct iscsi_login_rsp
*) login
->rsp
;
777 payload_length
= ntoh24(login_req
->dlength
);
779 param
= iscsi_find_param_from_key(AUTHMETHOD
, conn
->param_list
);
783 ret
= iscsi_decode_text_input(
784 PHASE_SECURITY
|PHASE_DECLARATIVE
,
785 SENDER_INITIATOR
|SENDER_RECEIVER
,
793 if (login
->auth_complete
) {
794 pr_err("Initiator has already been"
795 " successfully authenticated, but is still"
796 " sending %s keys.\n", param
->value
);
797 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
798 ISCSI_LOGIN_STATUS_INIT_ERR
);
803 } else if (!payload_length
) {
804 pr_err("Initiator sent zero length security payload,"
806 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
807 ISCSI_LOGIN_STATUS_AUTH_FAILED
);
811 if (login
->first_request
)
812 if (iscsi_target_check_first_request(conn
, login
) < 0)
815 ret
= iscsi_encode_text_output(
816 PHASE_SECURITY
|PHASE_DECLARATIVE
,
824 if (!iscsi_check_negotiated_keys(conn
->param_list
)) {
825 if (conn
->tpg
->tpg_attrib
.authentication
&&
826 !strncmp(param
->value
, NONE
, 4)) {
827 pr_err("Initiator sent AuthMethod=None but"
828 " Target is enforcing iSCSI Authentication,"
830 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
831 ISCSI_LOGIN_STATUS_AUTH_FAILED
);
835 if (conn
->tpg
->tpg_attrib
.authentication
&&
836 !login
->auth_complete
)
839 if (strncmp(param
->value
, NONE
, 4) && !login
->auth_complete
)
842 if ((login_req
->flags
& ISCSI_FLAG_LOGIN_NEXT_STAGE1
) &&
843 (login_req
->flags
& ISCSI_FLAG_LOGIN_TRANSIT
)) {
844 login_rsp
->flags
|= ISCSI_FLAG_LOGIN_NEXT_STAGE1
|
845 ISCSI_FLAG_LOGIN_TRANSIT
;
846 login
->current_stage
= 1;
852 return iscsi_target_do_authentication(conn
, login
);
855 static int iscsi_target_handle_csg_one(struct iscsi_conn
*conn
, struct iscsi_login
*login
)
859 struct iscsi_login_req
*login_req
;
860 struct iscsi_login_rsp
*login_rsp
;
862 login_req
= (struct iscsi_login_req
*) login
->req
;
863 login_rsp
= (struct iscsi_login_rsp
*) login
->rsp
;
864 payload_length
= ntoh24(login_req
->dlength
);
866 ret
= iscsi_decode_text_input(
867 PHASE_OPERATIONAL
|PHASE_DECLARATIVE
,
868 SENDER_INITIATOR
|SENDER_RECEIVER
,
873 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
874 ISCSI_LOGIN_STATUS_INIT_ERR
);
878 if (login
->first_request
)
879 if (iscsi_target_check_first_request(conn
, login
) < 0)
882 if (iscsi_target_check_for_existing_instances(conn
, login
) < 0)
885 ret
= iscsi_encode_text_output(
886 PHASE_OPERATIONAL
|PHASE_DECLARATIVE
,
892 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
893 ISCSI_LOGIN_STATUS_INIT_ERR
);
897 if (!login
->auth_complete
&&
898 conn
->tpg
->tpg_attrib
.authentication
) {
899 pr_err("Initiator is requesting CSG: 1, has not been"
900 " successfully authenticated, and the Target is"
901 " enforcing iSCSI Authentication, login failed.\n");
902 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
903 ISCSI_LOGIN_STATUS_AUTH_FAILED
);
907 if (!iscsi_check_negotiated_keys(conn
->param_list
))
908 if ((login_req
->flags
& ISCSI_FLAG_LOGIN_NEXT_STAGE3
) &&
909 (login_req
->flags
& ISCSI_FLAG_LOGIN_TRANSIT
))
910 login_rsp
->flags
|= ISCSI_FLAG_LOGIN_NEXT_STAGE3
|
911 ISCSI_FLAG_LOGIN_TRANSIT
;
916 static int iscsi_target_do_login(struct iscsi_conn
*conn
, struct iscsi_login
*login
)
919 struct iscsi_login_req
*login_req
;
920 struct iscsi_login_rsp
*login_rsp
;
922 login_req
= (struct iscsi_login_req
*) login
->req
;
923 login_rsp
= (struct iscsi_login_rsp
*) login
->rsp
;
926 if (++pdu_count
> MAX_LOGIN_PDUS
) {
927 pr_err("MAX_LOGIN_PDUS count reached.\n");
928 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
929 ISCSI_LOGIN_STATUS_TARGET_ERROR
);
933 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req
->flags
)) {
935 login_rsp
->flags
&= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK
;
936 if (iscsi_target_handle_csg_zero(conn
, login
) < 0)
940 login_rsp
->flags
|= ISCSI_FLAG_LOGIN_CURRENT_STAGE1
;
941 if (iscsi_target_handle_csg_one(conn
, login
) < 0)
943 if (login_rsp
->flags
& ISCSI_FLAG_LOGIN_TRANSIT
) {
944 login
->tsih
= conn
->sess
->tsih
;
945 login
->login_complete
= 1;
946 iscsi_target_restore_sock_callbacks(conn
);
947 if (iscsi_target_do_tx_login_io(conn
,
954 pr_err("Illegal CSG: %d received from"
955 " Initiator, protocol error.\n",
956 ISCSI_LOGIN_CURRENT_STAGE(login_req
->flags
));
960 if (iscsi_target_do_tx_login_io(conn
, login
) < 0)
963 if (login_rsp
->flags
& ISCSI_FLAG_LOGIN_TRANSIT
) {
964 login_rsp
->flags
&= ~ISCSI_FLAG_LOGIN_TRANSIT
;
965 login_rsp
->flags
&= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK
;
971 struct sock
*sk
= conn
->sock
->sk
;
974 read_lock_bh(&sk
->sk_callback_lock
);
975 state
= iscsi_target_sk_state_check(sk
);
976 read_unlock_bh(&sk
->sk_callback_lock
);
979 pr_debug("iscsi_target_do_login() failed state for"
980 " conn: %p\n", conn
);
988 static void iscsi_initiatorname_tolower(
992 u32 iqn_size
= strlen(param_buf
), i
;
994 for (i
= 0; i
< iqn_size
; i
++) {
1004 * Processes the first Login Request..
1006 int iscsi_target_locate_portal(
1007 struct iscsi_np
*np
,
1008 struct iscsi_conn
*conn
,
1009 struct iscsi_login
*login
)
1011 char *i_buf
= NULL
, *s_buf
= NULL
, *t_buf
= NULL
;
1012 char *tmpbuf
, *start
= NULL
, *end
= NULL
, *key
, *value
;
1013 struct iscsi_session
*sess
= conn
->sess
;
1014 struct iscsi_tiqn
*tiqn
;
1015 struct iscsi_tpg_np
*tpg_np
= NULL
;
1016 struct iscsi_login_req
*login_req
;
1017 struct se_node_acl
*se_nacl
;
1018 u32 payload_length
, queue_depth
= 0;
1019 int sessiontype
= 0, ret
= 0, tag_num
, tag_size
;
1021 INIT_DELAYED_WORK(&conn
->login_work
, iscsi_target_do_login_rx
);
1022 INIT_DELAYED_WORK(&conn
->login_cleanup_work
, iscsi_target_do_cleanup
);
1023 iscsi_target_set_sock_callbacks(conn
);
1027 login_req
= (struct iscsi_login_req
*) login
->req
;
1028 payload_length
= ntoh24(login_req
->dlength
);
1030 tmpbuf
= kzalloc(payload_length
+ 1, GFP_KERNEL
);
1032 pr_err("Unable to allocate memory for tmpbuf.\n");
1036 memcpy(tmpbuf
, login
->req_buf
, payload_length
);
1037 tmpbuf
[payload_length
] = '\0';
1039 end
= (start
+ payload_length
);
1042 * Locate the initial keys expected from the Initiator node in
1043 * the first login request in order to progress with the login phase.
1045 while (start
< end
) {
1046 if (iscsi_extract_key_value(start
, &key
, &value
) < 0) {
1051 if (!strncmp(key
, "InitiatorName", 13))
1053 else if (!strncmp(key
, "SessionType", 11))
1055 else if (!strncmp(key
, "TargetName", 10))
1058 start
+= strlen(key
) + strlen(value
) + 2;
1061 * See 5.3. Login Phase.
1064 pr_err("InitiatorName key not received"
1065 " in first login request.\n");
1066 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
1067 ISCSI_LOGIN_STATUS_MISSING_FIELDS
);
1072 * Convert the incoming InitiatorName to lowercase following
1073 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1074 * are NOT case sensitive.
1076 iscsi_initiatorname_tolower(i_buf
);
1079 if (!login
->leading_connection
)
1082 pr_err("SessionType key not received"
1083 " in first login request.\n");
1084 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
1085 ISCSI_LOGIN_STATUS_MISSING_FIELDS
);
1091 * Use default portal group for discovery sessions.
1093 sessiontype
= strncmp(s_buf
, DISCOVERY
, 9);
1095 conn
->tpg
= iscsit_global
->discovery_tpg
;
1096 if (!login
->leading_connection
)
1099 sess
->sess_ops
->SessionType
= 1;
1101 * Setup crc32c modules from libcrypto
1103 if (iscsi_login_setup_crypto(conn
) < 0) {
1104 pr_err("iscsi_login_setup_crypto() failed\n");
1109 * Serialize access across the discovery struct iscsi_portal_group to
1110 * process login attempt.
1112 if (iscsit_access_np(np
, conn
->tpg
) < 0) {
1113 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
1114 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE
);
1124 pr_err("TargetName key not received"
1125 " in first login request while"
1126 " SessionType=Normal.\n");
1127 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
1128 ISCSI_LOGIN_STATUS_MISSING_FIELDS
);
1134 * Locate Target IQN from Storage Node.
1136 tiqn
= iscsit_get_tiqn_for_login(t_buf
);
1138 pr_err("Unable to locate Target IQN: %s in"
1139 " Storage Node\n", t_buf
);
1140 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
1141 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE
);
1145 pr_debug("Located Storage Object: %s\n", tiqn
->tiqn
);
1148 * Locate Target Portal Group from Storage Node.
1150 conn
->tpg
= iscsit_get_tpg_from_np(tiqn
, np
, &tpg_np
);
1152 pr_err("Unable to locate Target Portal Group"
1153 " on %s\n", tiqn
->tiqn
);
1154 iscsit_put_tiqn_for_login(tiqn
);
1155 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
1156 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE
);
1160 conn
->tpg_np
= tpg_np
;
1161 pr_debug("Located Portal Group Object: %hu\n", conn
->tpg
->tpgt
);
1163 * Setup crc32c modules from libcrypto
1165 if (iscsi_login_setup_crypto(conn
) < 0) {
1166 pr_err("iscsi_login_setup_crypto() failed\n");
1167 kref_put(&tpg_np
->tpg_np_kref
, iscsit_login_kref_put
);
1168 iscsit_put_tiqn_for_login(tiqn
);
1174 * Serialize access across the struct iscsi_portal_group to
1175 * process login attempt.
1177 if (iscsit_access_np(np
, conn
->tpg
) < 0) {
1178 kref_put(&tpg_np
->tpg_np_kref
, iscsit_login_kref_put
);
1179 iscsit_put_tiqn_for_login(tiqn
);
1180 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
1181 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE
);
1188 * conn->sess->node_acl will be set when the referenced
1189 * struct iscsi_session is located from received ISID+TSIH in
1190 * iscsi_login_non_zero_tsih_s2().
1192 if (!login
->leading_connection
) {
1198 * This value is required in iscsi_login_zero_tsih_s2()
1200 sess
->sess_ops
->SessionType
= 0;
1203 * Locate incoming Initiator IQN reference from Storage Node.
1205 sess
->se_sess
->se_node_acl
= core_tpg_check_initiator_node_acl(
1206 &conn
->tpg
->tpg_se_tpg
, i_buf
);
1207 if (!sess
->se_sess
->se_node_acl
) {
1208 pr_err("iSCSI Initiator Node: %s is not authorized to"
1209 " access iSCSI target portal group: %hu.\n",
1210 i_buf
, conn
->tpg
->tpgt
);
1211 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
1212 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN
);
1216 se_nacl
= sess
->se_sess
->se_node_acl
;
1217 queue_depth
= se_nacl
->queue_depth
;
1219 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1220 * depth for non immediate commands, plus extra tags for immediate
1223 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1224 * in per-cpu-ida tag allocation logic + small queue_depth.
1227 tag_num
= max_t(u32
, ISCSIT_MIN_TAGS
, queue_depth
);
1228 tag_num
= (tag_num
* 2) + ISCSIT_EXTRA_TAGS
;
1229 tag_size
= sizeof(struct iscsi_cmd
) + conn
->conn_transport
->priv_size
;
1231 ret
= transport_alloc_session_tags(sess
->se_sess
, tag_num
, tag_size
);
1233 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
1234 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
1242 int iscsi_target_start_negotiation(
1243 struct iscsi_login
*login
,
1244 struct iscsi_conn
*conn
)
1248 ret
= iscsi_target_do_login(conn
, login
);
1251 struct sock
*sk
= conn
->sock
->sk
;
1253 write_lock_bh(&sk
->sk_callback_lock
);
1254 set_bit(LOGIN_FLAGS_READY
, &conn
->login_flags
);
1255 write_unlock_bh(&sk
->sk_callback_lock
);
1257 } else if (ret
< 0) {
1258 cancel_delayed_work_sync(&conn
->login_work
);
1259 cancel_delayed_work_sync(&conn
->login_cleanup_work
);
1260 iscsi_target_restore_sock_callbacks(conn
);
1261 iscsi_remove_failed_auth_entry(conn
);
1264 iscsi_target_nego_release(conn
);
1269 void iscsi_target_nego_release(struct iscsi_conn
*conn
)
1271 struct iscsi_login
*login
= conn
->conn_login
;
1276 kfree(login
->req_buf
);
1277 kfree(login
->rsp_buf
);
1280 conn
->conn_login
= NULL
;