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 complete(&conn->rx_login_comp);
392 kthread_stop(conn->rx_thread);
394 if (conn->tx_thread && conn->tx_thread_active) {
395 send_sig(SIGINT, conn->tx_thread, 1);
396 kthread_stop(conn->tx_thread);
398 spin_lock(&iscsit_global->ts_bitmap_lock);
399 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
401 spin_unlock(&iscsit_global->ts_bitmap_lock);
406 static void iscsi_target_sk_data_ready(struct sock *sk)
408 struct iscsi_conn *conn = sk->sk_user_data;
411 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
413 write_lock_bh(&sk->sk_callback_lock);
414 if (!sk->sk_user_data) {
415 write_unlock_bh(&sk->sk_callback_lock);
418 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
419 write_unlock_bh(&sk->sk_callback_lock);
420 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
423 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
424 write_unlock_bh(&sk->sk_callback_lock);
425 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
428 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
429 write_unlock_bh(&sk->sk_callback_lock);
430 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
434 rc = schedule_delayed_work(&conn->login_work, 0);
436 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
439 write_unlock_bh(&sk->sk_callback_lock);
442 static void iscsi_target_sk_state_change(struct sock *);
444 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
452 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
454 write_lock_bh(&sk->sk_callback_lock);
455 sk->sk_user_data = conn;
456 conn->orig_data_ready = sk->sk_data_ready;
457 conn->orig_state_change = sk->sk_state_change;
458 sk->sk_data_ready = iscsi_target_sk_data_ready;
459 sk->sk_state_change = iscsi_target_sk_state_change;
460 write_unlock_bh(&sk->sk_callback_lock);
462 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
463 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
466 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
474 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
476 write_lock_bh(&sk->sk_callback_lock);
477 if (!sk->sk_user_data) {
478 write_unlock_bh(&sk->sk_callback_lock);
481 sk->sk_user_data = NULL;
482 sk->sk_data_ready = conn->orig_data_ready;
483 sk->sk_state_change = conn->orig_state_change;
484 write_unlock_bh(&sk->sk_callback_lock);
486 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
487 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
490 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
492 static bool __iscsi_target_sk_check_close(struct sock *sk)
494 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
495 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE,"
496 "returning FALSE\n");
502 static bool iscsi_target_sk_check_close(struct iscsi_conn *conn)
507 struct sock *sk = conn->sock->sk;
509 read_lock_bh(&sk->sk_callback_lock);
510 state = (__iscsi_target_sk_check_close(sk) ||
511 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
512 read_unlock_bh(&sk->sk_callback_lock);
517 static bool iscsi_target_sk_check_flag(struct iscsi_conn *conn, unsigned int flag)
522 struct sock *sk = conn->sock->sk;
524 read_lock_bh(&sk->sk_callback_lock);
525 state = test_bit(flag, &conn->login_flags);
526 read_unlock_bh(&sk->sk_callback_lock);
531 static bool iscsi_target_sk_check_and_clear(struct iscsi_conn *conn, unsigned int flag)
536 struct sock *sk = conn->sock->sk;
538 write_lock_bh(&sk->sk_callback_lock);
539 state = (__iscsi_target_sk_check_close(sk) ||
540 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
542 clear_bit(flag, &conn->login_flags);
543 write_unlock_bh(&sk->sk_callback_lock);
548 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
550 bool zero_tsih = login->zero_tsih;
552 iscsi_remove_failed_auth_entry(conn);
553 iscsi_target_nego_release(conn);
554 iscsi_target_login_sess_out(conn, zero_tsih, true);
557 static void iscsi_target_login_timeout(unsigned long data)
559 struct iscsi_conn *conn = (struct iscsi_conn *)data;
561 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
563 if (conn->login_kworker) {
564 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
565 conn->login_kworker->comm, conn->login_kworker->pid);
566 send_sig(SIGINT, conn->login_kworker, 1);
570 static void iscsi_target_do_login_rx(struct work_struct *work)
572 struct iscsi_conn *conn = container_of(work,
573 struct iscsi_conn, login_work.work);
574 struct iscsi_login *login = conn->login;
575 struct iscsi_np *np = login->np;
576 struct iscsi_portal_group *tpg = conn->tpg;
577 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
578 struct timer_list login_timer;
579 int rc, zero_tsih = login->zero_tsih;
582 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
583 conn, current->comm, current->pid);
585 * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready()
586 * before initial PDU processing in iscsi_target_start_negotiation()
587 * has completed, go ahead and retry until it's cleared.
589 * Otherwise if the TCP connection drops while this is occuring,
590 * iscsi_target_start_negotiation() will detect the failure, call
591 * cancel_delayed_work_sync(&conn->login_work), and cleanup the
592 * remaining iscsi connection resources from iscsi_np process context.
594 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) {
595 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10));
599 spin_lock(&tpg->tpg_state_lock);
600 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
601 spin_unlock(&tpg->tpg_state_lock);
604 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
608 if (iscsi_target_sk_check_close(conn)) {
609 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
613 conn->login_kworker = current;
614 allow_signal(SIGINT);
616 init_timer(&login_timer);
617 login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
618 login_timer.data = (unsigned long)conn;
619 login_timer.function = iscsi_target_login_timeout;
620 add_timer(&login_timer);
621 pr_debug("Starting login_timer for %s/%d\n", current->comm, current->pid);
623 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
624 del_timer_sync(&login_timer);
625 flush_signals(current);
626 conn->login_kworker = NULL;
631 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
632 conn, current->comm, current->pid);
634 rc = iscsi_target_do_login(conn, login);
638 if (iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_READ_ACTIVE))
640 } else if (rc == 1) {
641 iscsi_target_nego_release(conn);
642 iscsi_post_login_handler(np, conn, zero_tsih);
643 iscsit_deaccess_np(np, tpg, tpg_np);
648 iscsi_target_restore_sock_callbacks(conn);
649 iscsi_target_login_drop(conn, login);
650 iscsit_deaccess_np(np, tpg, tpg_np);
653 static void iscsi_target_do_cleanup(struct work_struct *work)
655 struct iscsi_conn *conn = container_of(work,
656 struct iscsi_conn, login_cleanup_work.work);
657 struct sock *sk = conn->sock->sk;
658 struct iscsi_login *login = conn->login;
659 struct iscsi_np *np = login->np;
660 struct iscsi_portal_group *tpg = conn->tpg;
661 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
663 pr_debug("Entering iscsi_target_do_cleanup\n");
665 cancel_delayed_work_sync(&conn->login_work);
666 conn->orig_state_change(sk);
668 iscsi_target_restore_sock_callbacks(conn);
669 iscsi_target_login_drop(conn, login);
670 iscsit_deaccess_np(np, tpg, tpg_np);
672 pr_debug("iscsi_target_do_cleanup done()\n");
675 static void iscsi_target_sk_state_change(struct sock *sk)
677 struct iscsi_conn *conn;
678 void (*orig_state_change)(struct sock *);
681 pr_debug("Entering iscsi_target_sk_state_change\n");
683 write_lock_bh(&sk->sk_callback_lock);
684 conn = sk->sk_user_data;
686 write_unlock_bh(&sk->sk_callback_lock);
689 orig_state_change = conn->orig_state_change;
691 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
692 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
694 write_unlock_bh(&sk->sk_callback_lock);
695 orig_state_change(sk);
698 state = __iscsi_target_sk_check_close(sk);
699 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state);
701 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
702 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
703 " conn: %p\n", conn);
705 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
706 write_unlock_bh(&sk->sk_callback_lock);
707 orig_state_change(sk);
710 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
711 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
713 write_unlock_bh(&sk->sk_callback_lock);
714 orig_state_change(sk);
718 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED,
719 * but only queue conn->login_work -> iscsi_target_do_login_rx()
720 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared.
722 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close()
723 * will detect the dropped TCP connection from delayed workqueue context.
725 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial
726 * iscsi_target_start_negotiation() is running, iscsi_target_do_login()
727 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation()
728 * via iscsi_target_sk_check_and_clear() is responsible for detecting the
729 * dropped TCP connection in iscsi_np process context, and cleaning up
730 * the remaining iscsi connection resources.
733 pr_debug("iscsi_target_sk_state_change got failed state\n");
734 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
735 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
736 write_unlock_bh(&sk->sk_callback_lock);
738 orig_state_change(sk);
741 schedule_delayed_work(&conn->login_work, 0);
744 write_unlock_bh(&sk->sk_callback_lock);
746 orig_state_change(sk);
750 * NOTE: We check for existing sessions or connections AFTER the initiator
751 * has been successfully authenticated in order to protect against faked
752 * ISID/TSIH combinations.
754 static int iscsi_target_check_for_existing_instances(
755 struct iscsi_conn *conn,
756 struct iscsi_login *login)
758 if (login->checked_for_existing)
761 login->checked_for_existing = 1;
764 return iscsi_check_for_session_reinstatement(conn);
766 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
767 login->initial_exp_statsn);
770 static int iscsi_target_do_authentication(
771 struct iscsi_conn *conn,
772 struct iscsi_login *login)
776 struct iscsi_param *param;
777 struct iscsi_login_req *login_req;
778 struct iscsi_login_rsp *login_rsp;
780 login_req = (struct iscsi_login_req *) login->req;
781 login_rsp = (struct iscsi_login_rsp *) login->rsp;
782 payload_length = ntoh24(login_req->dlength);
784 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
788 authret = iscsi_handle_authentication(
797 pr_debug("Received OK response"
798 " from LIO Authentication, continuing.\n");
801 pr_debug("iSCSI security negotiation"
802 " completed successfully.\n");
803 login->auth_complete = 1;
804 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
805 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
806 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
807 ISCSI_FLAG_LOGIN_TRANSIT);
808 login->current_stage = 1;
810 return iscsi_target_check_for_existing_instances(
813 pr_err("Security negotiation"
815 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
816 ISCSI_LOGIN_STATUS_AUTH_FAILED);
819 pr_err("Received unknown error %d from LIO"
820 " Authentication\n", authret);
821 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
822 ISCSI_LOGIN_STATUS_TARGET_ERROR);
829 static int iscsi_target_handle_csg_zero(
830 struct iscsi_conn *conn,
831 struct iscsi_login *login)
835 struct iscsi_param *param;
836 struct iscsi_login_req *login_req;
837 struct iscsi_login_rsp *login_rsp;
839 login_req = (struct iscsi_login_req *) login->req;
840 login_rsp = (struct iscsi_login_rsp *) login->rsp;
841 payload_length = ntoh24(login_req->dlength);
843 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
847 ret = iscsi_decode_text_input(
848 PHASE_SECURITY|PHASE_DECLARATIVE,
849 SENDER_INITIATOR|SENDER_RECEIVER,
857 if (login->auth_complete) {
858 pr_err("Initiator has already been"
859 " successfully authenticated, but is still"
860 " sending %s keys.\n", param->value);
861 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
862 ISCSI_LOGIN_STATUS_INIT_ERR);
867 } else if (!payload_length) {
868 pr_err("Initiator sent zero length security payload,"
870 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
871 ISCSI_LOGIN_STATUS_AUTH_FAILED);
875 if (login->first_request)
876 if (iscsi_target_check_first_request(conn, login) < 0)
879 ret = iscsi_encode_text_output(
880 PHASE_SECURITY|PHASE_DECLARATIVE,
885 conn->tpg->tpg_attrib.login_keys_workaround);
889 if (!iscsi_check_negotiated_keys(conn->param_list)) {
890 if (conn->tpg->tpg_attrib.authentication &&
891 !strncmp(param->value, NONE, 4)) {
892 pr_err("Initiator sent AuthMethod=None but"
893 " Target is enforcing iSCSI Authentication,"
895 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
896 ISCSI_LOGIN_STATUS_AUTH_FAILED);
900 if (conn->tpg->tpg_attrib.authentication &&
901 !login->auth_complete)
904 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
907 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
908 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
909 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
910 ISCSI_FLAG_LOGIN_TRANSIT;
911 login->current_stage = 1;
917 return iscsi_target_do_authentication(conn, login);
920 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
924 struct iscsi_login_req *login_req;
925 struct iscsi_login_rsp *login_rsp;
927 login_req = (struct iscsi_login_req *) login->req;
928 login_rsp = (struct iscsi_login_rsp *) login->rsp;
929 payload_length = ntoh24(login_req->dlength);
931 ret = iscsi_decode_text_input(
932 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
933 SENDER_INITIATOR|SENDER_RECEIVER,
938 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
939 ISCSI_LOGIN_STATUS_INIT_ERR);
943 if (login->first_request)
944 if (iscsi_target_check_first_request(conn, login) < 0)
947 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
950 ret = iscsi_encode_text_output(
951 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
956 conn->tpg->tpg_attrib.login_keys_workaround);
958 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
959 ISCSI_LOGIN_STATUS_INIT_ERR);
963 if (!login->auth_complete &&
964 conn->tpg->tpg_attrib.authentication) {
965 pr_err("Initiator is requesting CSG: 1, has not been"
966 " successfully authenticated, and the Target is"
967 " enforcing iSCSI Authentication, login failed.\n");
968 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
969 ISCSI_LOGIN_STATUS_AUTH_FAILED);
973 if (!iscsi_check_negotiated_keys(conn->param_list))
974 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
975 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
976 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
977 ISCSI_FLAG_LOGIN_TRANSIT;
982 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
985 struct iscsi_login_req *login_req;
986 struct iscsi_login_rsp *login_rsp;
988 login_req = (struct iscsi_login_req *) login->req;
989 login_rsp = (struct iscsi_login_rsp *) login->rsp;
992 if (++pdu_count > MAX_LOGIN_PDUS) {
993 pr_err("MAX_LOGIN_PDUS count reached.\n");
994 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
995 ISCSI_LOGIN_STATUS_TARGET_ERROR);
999 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
1001 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
1002 if (iscsi_target_handle_csg_zero(conn, login) < 0)
1006 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
1007 if (iscsi_target_handle_csg_one(conn, login) < 0)
1009 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1011 * Check to make sure the TCP connection has not
1012 * dropped asynchronously while session reinstatement
1013 * was occuring in this kthread context, before
1014 * transitioning to full feature phase operation.
1016 if (iscsi_target_sk_check_close(conn))
1019 login->tsih = conn->sess->tsih;
1020 login->login_complete = 1;
1021 iscsi_target_restore_sock_callbacks(conn);
1022 if (iscsi_target_do_tx_login_io(conn,
1029 pr_err("Illegal CSG: %d received from"
1030 " Initiator, protocol error.\n",
1031 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
1035 if (iscsi_target_do_tx_login_io(conn, login) < 0)
1038 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1039 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
1040 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
1048 static void iscsi_initiatorname_tolower(
1052 u32 iqn_size = strlen(param_buf), i;
1054 for (i = 0; i < iqn_size; i++) {
1064 * Processes the first Login Request..
1066 int iscsi_target_locate_portal(
1067 struct iscsi_np *np,
1068 struct iscsi_conn *conn,
1069 struct iscsi_login *login)
1071 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1072 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1073 struct iscsi_session *sess = conn->sess;
1074 struct iscsi_tiqn *tiqn;
1075 struct iscsi_tpg_np *tpg_np = NULL;
1076 struct iscsi_login_req *login_req;
1077 struct se_node_acl *se_nacl;
1078 u32 payload_length, queue_depth = 0;
1079 int sessiontype = 0, ret = 0, tag_num, tag_size;
1081 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1082 INIT_DELAYED_WORK(&conn->login_cleanup_work, iscsi_target_do_cleanup);
1083 iscsi_target_set_sock_callbacks(conn);
1087 login_req = (struct iscsi_login_req *) login->req;
1088 payload_length = ntoh24(login_req->dlength);
1090 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1092 pr_err("Unable to allocate memory for tmpbuf.\n");
1096 memcpy(tmpbuf, login->req_buf, payload_length);
1097 tmpbuf[payload_length] = '\0';
1099 end = (start + payload_length);
1102 * Locate the initial keys expected from the Initiator node in
1103 * the first login request in order to progress with the login phase.
1105 while (start < end) {
1106 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1111 if (!strncmp(key, "InitiatorName", 13))
1113 else if (!strncmp(key, "SessionType", 11))
1115 else if (!strncmp(key, "TargetName", 10))
1118 start += strlen(key) + strlen(value) + 2;
1121 * See 5.3. Login Phase.
1124 pr_err("InitiatorName key not received"
1125 " in first login request.\n");
1126 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1127 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1132 * Convert the incoming InitiatorName to lowercase following
1133 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1134 * are NOT case sensitive.
1136 iscsi_initiatorname_tolower(i_buf);
1139 if (!login->leading_connection)
1142 pr_err("SessionType key not received"
1143 " in first login request.\n");
1144 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1145 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1151 * Use default portal group for discovery sessions.
1153 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1155 conn->tpg = iscsit_global->discovery_tpg;
1156 if (!login->leading_connection)
1159 sess->sess_ops->SessionType = 1;
1161 * Setup crc32c modules from libcrypto
1163 if (iscsi_login_setup_crypto(conn) < 0) {
1164 pr_err("iscsi_login_setup_crypto() failed\n");
1169 * Serialize access across the discovery struct iscsi_portal_group to
1170 * process login attempt.
1172 if (iscsit_access_np(np, conn->tpg) < 0) {
1173 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1174 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1184 pr_err("TargetName key not received"
1185 " in first login request while"
1186 " SessionType=Normal.\n");
1187 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1188 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1194 * Locate Target IQN from Storage Node.
1196 tiqn = iscsit_get_tiqn_for_login(t_buf);
1198 pr_err("Unable to locate Target IQN: %s in"
1199 " Storage Node\n", t_buf);
1200 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1201 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1205 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1208 * Locate Target Portal Group from Storage Node.
1210 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1212 pr_err("Unable to locate Target Portal Group"
1213 " on %s\n", tiqn->tiqn);
1214 iscsit_put_tiqn_for_login(tiqn);
1215 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1216 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1220 conn->tpg_np = tpg_np;
1221 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1223 * Setup crc32c modules from libcrypto
1225 if (iscsi_login_setup_crypto(conn) < 0) {
1226 pr_err("iscsi_login_setup_crypto() failed\n");
1227 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1228 iscsit_put_tiqn_for_login(tiqn);
1234 * Serialize access across the struct iscsi_portal_group to
1235 * process login attempt.
1237 if (iscsit_access_np(np, conn->tpg) < 0) {
1238 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1239 iscsit_put_tiqn_for_login(tiqn);
1240 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1241 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1248 * conn->sess->node_acl will be set when the referenced
1249 * struct iscsi_session is located from received ISID+TSIH in
1250 * iscsi_login_non_zero_tsih_s2().
1252 if (!login->leading_connection) {
1258 * This value is required in iscsi_login_zero_tsih_s2()
1260 sess->sess_ops->SessionType = 0;
1263 * Locate incoming Initiator IQN reference from Storage Node.
1265 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1266 &conn->tpg->tpg_se_tpg, i_buf);
1267 if (!sess->se_sess->se_node_acl) {
1268 pr_err("iSCSI Initiator Node: %s is not authorized to"
1269 " access iSCSI target portal group: %hu.\n",
1270 i_buf, conn->tpg->tpgt);
1271 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1272 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1276 se_nacl = sess->se_sess->se_node_acl;
1277 queue_depth = se_nacl->queue_depth;
1279 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1280 * depth for non immediate commands, plus extra tags for immediate
1283 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1284 * in per-cpu-ida tag allocation logic + small queue_depth.
1287 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1288 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1289 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1291 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1293 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1294 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1302 int iscsi_target_start_negotiation(
1303 struct iscsi_login *login,
1304 struct iscsi_conn *conn)
1309 struct sock *sk = conn->sock->sk;
1311 write_lock_bh(&sk->sk_callback_lock);
1312 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1313 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
1314 write_unlock_bh(&sk->sk_callback_lock);
1317 * If iscsi_target_do_login returns zero to signal more PDU
1318 * exchanges are required to complete the login, go ahead and
1319 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection
1322 * Otherwise if TCP connection dropped asynchronously, go ahead
1323 * and perform connection cleanup now.
1325 ret = iscsi_target_do_login(conn, login);
1326 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
1330 cancel_delayed_work_sync(&conn->login_work);
1331 cancel_delayed_work_sync(&conn->login_cleanup_work);
1332 iscsi_target_restore_sock_callbacks(conn);
1333 iscsi_remove_failed_auth_entry(conn);
1336 iscsi_target_nego_release(conn);
1341 void iscsi_target_nego_release(struct iscsi_conn *conn)
1343 struct iscsi_login *login = conn->conn_login;
1348 kfree(login->req_buf);
1349 kfree(login->rsp_buf);
1352 conn->conn_login = NULL;