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 <scsi/iscsi_proto.h>
21 #include <target/target_core_base.h>
22 #include <target/target_core_fabric.h>
23 #include <target/iscsi/iscsi_transport.h>
25 #include <target/iscsi/iscsi_target_core.h>
26 #include "iscsi_target_parameters.h"
27 #include "iscsi_target_login.h"
28 #include "iscsi_target_nego.h"
29 #include "iscsi_target_tpg.h"
30 #include "iscsi_target_util.h"
31 #include "iscsi_target.h"
32 #include "iscsi_target_auth.h"
34 #define MAX_LOGIN_PDUS 7
37 void convert_null_to_semi(char *buf, int len)
41 for (i = 0; i < len; i++)
46 static int strlen_semi(char *buf)
50 while (buf[i] != '\0') {
62 unsigned int max_length,
69 if (!in_buf || !pattern || !out_buf || !type)
72 ptr = strstr(in_buf, pattern);
76 ptr = strstr(ptr, "=");
81 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
82 ptr += 2; /* skip 0x */
87 len = strlen_semi(ptr);
91 if (len >= max_length) {
92 pr_err("Length of input: %d exceeds max_length:"
93 " %d\n", len, max_length);
96 memcpy(out_buf, ptr, len);
102 static u32 iscsi_handle_authentication(
103 struct iscsi_conn *conn,
108 unsigned char *authtype)
110 struct iscsi_session *sess = conn->sess;
111 struct iscsi_node_auth *auth;
112 struct iscsi_node_acl *iscsi_nacl;
113 struct iscsi_portal_group *iscsi_tpg;
114 struct se_node_acl *se_nacl;
116 if (!sess->sess_ops->SessionType) {
118 * For SessionType=Normal
120 se_nacl = conn->sess->se_sess->se_node_acl;
122 pr_err("Unable to locate struct se_node_acl for"
126 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
129 pr_err("Unable to locate struct iscsi_node_acl for"
134 if (se_nacl->dynamic_node_acl) {
135 iscsi_tpg = container_of(se_nacl->se_tpg,
136 struct iscsi_portal_group, tpg_se_tpg);
138 auth = &iscsi_tpg->tpg_demo_auth;
140 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
143 auth = &iscsi_nacl->node_auth;
147 * For SessionType=Discovery
149 auth = &iscsit_global->discovery_acl.node_auth;
152 if (strstr("CHAP", authtype))
153 strcpy(conn->sess->auth_type, "CHAP");
155 strcpy(conn->sess->auth_type, NONE);
157 if (strstr("None", authtype))
160 else if (strstr("SRP", authtype))
161 return srp_main_loop(conn, auth, in_buf, out_buf,
162 &in_length, out_length);
164 else if (strstr("CHAP", authtype))
165 return chap_main_loop(conn, auth, in_buf, out_buf,
166 &in_length, out_length);
167 else if (strstr("SPKM1", authtype))
169 else if (strstr("SPKM2", authtype))
171 else if (strstr("KRB5", authtype))
177 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
179 kfree(conn->auth_protocol);
182 int iscsi_target_check_login_request(
183 struct iscsi_conn *conn,
184 struct iscsi_login *login)
186 int req_csg, req_nsg;
188 struct iscsi_login_req *login_req;
190 login_req = (struct iscsi_login_req *) login->req;
191 payload_length = ntoh24(login_req->dlength);
193 switch (login_req->opcode & ISCSI_OPCODE_MASK) {
197 pr_err("Received unknown opcode 0x%02x.\n",
198 login_req->opcode & ISCSI_OPCODE_MASK);
199 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
200 ISCSI_LOGIN_STATUS_INIT_ERR);
204 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
205 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
206 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
207 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
208 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
209 ISCSI_LOGIN_STATUS_INIT_ERR);
213 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
214 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
216 if (req_csg != login->current_stage) {
217 pr_err("Initiator unexpectedly changed login stage"
218 " from %d to %d, login failed.\n", login->current_stage,
220 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
221 ISCSI_LOGIN_STATUS_INIT_ERR);
225 if ((req_nsg == 2) || (req_csg >= 2) ||
226 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
227 (req_nsg <= req_csg))) {
228 pr_err("Illegal login_req->flags Combination, CSG: %d,"
229 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
230 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
231 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
232 ISCSI_LOGIN_STATUS_INIT_ERR);
236 if ((login_req->max_version != login->version_max) ||
237 (login_req->min_version != login->version_min)) {
238 pr_err("Login request changed Version Max/Nin"
239 " unexpectedly to 0x%02x/0x%02x, protocol error\n",
240 login_req->max_version, login_req->min_version);
241 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
242 ISCSI_LOGIN_STATUS_INIT_ERR);
246 if (memcmp(login_req->isid, login->isid, 6) != 0) {
247 pr_err("Login request changed ISID unexpectedly,"
248 " protocol error.\n");
249 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
250 ISCSI_LOGIN_STATUS_INIT_ERR);
254 if (login_req->itt != login->init_task_tag) {
255 pr_err("Login request changed ITT unexpectedly to"
256 " 0x%08x, protocol error.\n", login_req->itt);
257 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
258 ISCSI_LOGIN_STATUS_INIT_ERR);
262 if (payload_length > MAX_KEY_VALUE_PAIRS) {
263 pr_err("Login request payload exceeds default"
264 " MaxRecvDataSegmentLength: %u, protocol error.\n",
265 MAX_KEY_VALUE_PAIRS);
272 static int iscsi_target_check_first_request(
273 struct iscsi_conn *conn,
274 struct iscsi_login *login)
276 struct iscsi_param *param = NULL;
277 struct se_node_acl *se_nacl;
279 login->first_request = 0;
281 list_for_each_entry(param, &conn->param_list->param_list, p_list) {
282 if (!strncmp(param->name, SESSIONTYPE, 11)) {
283 if (!IS_PSTATE_ACCEPTOR(param)) {
284 pr_err("SessionType key not received"
285 " in first login request.\n");
286 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
287 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
290 if (!strncmp(param->value, DISCOVERY, 9))
294 if (!strncmp(param->name, INITIATORNAME, 13)) {
295 if (!IS_PSTATE_ACCEPTOR(param)) {
296 if (!login->leading_connection)
299 pr_err("InitiatorName key not received"
300 " in first login request.\n");
301 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
302 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
307 * For non-leading connections, double check that the
308 * received InitiatorName matches the existing session's
309 * struct iscsi_node_acl.
311 if (!login->leading_connection) {
312 se_nacl = conn->sess->se_sess->se_node_acl;
314 pr_err("Unable to locate"
315 " struct se_node_acl\n");
316 iscsit_tx_login_rsp(conn,
317 ISCSI_STATUS_CLS_INITIATOR_ERR,
318 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
322 if (strcmp(param->value,
323 se_nacl->initiatorname)) {
325 " InitiatorName: %s for this"
326 " iSCSI Initiator Node.\n",
328 iscsit_tx_login_rsp(conn,
329 ISCSI_STATUS_CLS_INITIATOR_ERR,
330 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
340 static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
343 struct iscsi_session *sess = conn->sess;
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(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 if (conn->conn_transport->iscsit_put_login_tx(conn, login,
366 login->rsp_length + padding) < 0)
369 login->rsp_length = 0;
370 mutex_lock(&sess->cmdsn_mutex);
371 login_rsp->exp_cmdsn = cpu_to_be32(sess->exp_cmd_sn);
372 login_rsp->max_cmdsn = cpu_to_be32(sess->max_cmd_sn);
373 mutex_unlock(&sess->cmdsn_mutex);
378 static void iscsi_target_sk_data_ready(struct sock *sk)
380 struct iscsi_conn *conn = sk->sk_user_data;
383 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
385 write_lock_bh(&sk->sk_callback_lock);
386 if (!sk->sk_user_data) {
387 write_unlock_bh(&sk->sk_callback_lock);
390 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
391 write_unlock_bh(&sk->sk_callback_lock);
392 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
395 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
396 write_unlock_bh(&sk->sk_callback_lock);
397 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
400 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
401 write_unlock_bh(&sk->sk_callback_lock);
402 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
406 rc = schedule_delayed_work(&conn->login_work, 0);
408 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
411 write_unlock_bh(&sk->sk_callback_lock);
414 static void iscsi_target_sk_state_change(struct sock *);
416 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
424 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
426 write_lock_bh(&sk->sk_callback_lock);
427 sk->sk_user_data = conn;
428 conn->orig_data_ready = sk->sk_data_ready;
429 conn->orig_state_change = sk->sk_state_change;
430 sk->sk_data_ready = iscsi_target_sk_data_ready;
431 sk->sk_state_change = iscsi_target_sk_state_change;
432 write_unlock_bh(&sk->sk_callback_lock);
434 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
435 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
438 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
446 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
448 write_lock_bh(&sk->sk_callback_lock);
449 if (!sk->sk_user_data) {
450 write_unlock_bh(&sk->sk_callback_lock);
453 sk->sk_user_data = NULL;
454 sk->sk_data_ready = conn->orig_data_ready;
455 sk->sk_state_change = conn->orig_state_change;
456 write_unlock_bh(&sk->sk_callback_lock);
458 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
459 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
462 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
464 static bool iscsi_target_sk_state_check(struct sock *sk)
466 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
467 pr_debug("iscsi_target_sk_state_check: TCP_CLOSE_WAIT|TCP_CLOSE,"
468 "returning FALSE\n");
474 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
476 struct iscsi_np *np = login->np;
477 bool zero_tsih = login->zero_tsih;
479 iscsi_remove_failed_auth_entry(conn);
480 iscsi_target_nego_release(conn);
481 iscsi_target_login_sess_out(conn, np, zero_tsih, true);
484 static void iscsi_target_login_timeout(unsigned long data)
486 struct iscsi_conn *conn = (struct iscsi_conn *)data;
488 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
490 if (conn->login_kworker) {
491 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
492 conn->login_kworker->comm, conn->login_kworker->pid);
493 send_sig(SIGINT, conn->login_kworker, 1);
497 static void iscsi_target_do_login_rx(struct work_struct *work)
499 struct iscsi_conn *conn = container_of(work,
500 struct iscsi_conn, login_work.work);
501 struct iscsi_login *login = conn->login;
502 struct iscsi_np *np = login->np;
503 struct iscsi_portal_group *tpg = conn->tpg;
504 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
505 struct timer_list login_timer;
506 int rc, zero_tsih = login->zero_tsih;
509 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
510 conn, current->comm, current->pid);
512 spin_lock(&tpg->tpg_state_lock);
513 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
514 spin_unlock(&tpg->tpg_state_lock);
517 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
518 iscsi_target_restore_sock_callbacks(conn);
519 iscsi_target_login_drop(conn, login);
520 iscsit_deaccess_np(np, tpg, tpg_np);
525 struct sock *sk = conn->sock->sk;
527 read_lock_bh(&sk->sk_callback_lock);
528 state = iscsi_target_sk_state_check(sk);
529 read_unlock_bh(&sk->sk_callback_lock);
532 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
533 iscsi_target_restore_sock_callbacks(conn);
534 iscsi_target_login_drop(conn, login);
535 iscsit_deaccess_np(np, tpg, tpg_np);
540 conn->login_kworker = current;
541 allow_signal(SIGINT);
543 init_timer(&login_timer);
544 login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
545 login_timer.data = (unsigned long)conn;
546 login_timer.function = iscsi_target_login_timeout;
547 add_timer(&login_timer);
548 pr_debug("Starting login_timer for %s/%d\n", current->comm, current->pid);
550 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
551 del_timer_sync(&login_timer);
552 flush_signals(current);
553 conn->login_kworker = NULL;
556 iscsi_target_restore_sock_callbacks(conn);
557 iscsi_target_login_drop(conn, login);
558 iscsit_deaccess_np(np, tpg, tpg_np);
562 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
563 conn, current->comm, current->pid);
565 rc = iscsi_target_do_login(conn, login);
567 iscsi_target_restore_sock_callbacks(conn);
568 iscsi_target_login_drop(conn, login);
569 iscsit_deaccess_np(np, tpg, tpg_np);
572 struct sock *sk = conn->sock->sk;
574 write_lock_bh(&sk->sk_callback_lock);
575 clear_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags);
576 write_unlock_bh(&sk->sk_callback_lock);
578 } else if (rc == 1) {
579 iscsi_target_nego_release(conn);
580 iscsi_post_login_handler(np, conn, zero_tsih);
581 iscsit_deaccess_np(np, tpg, tpg_np);
585 static void iscsi_target_do_cleanup(struct work_struct *work)
587 struct iscsi_conn *conn = container_of(work,
588 struct iscsi_conn, login_cleanup_work.work);
589 struct sock *sk = conn->sock->sk;
590 struct iscsi_login *login = conn->login;
591 struct iscsi_np *np = login->np;
592 struct iscsi_portal_group *tpg = conn->tpg;
593 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
595 pr_debug("Entering iscsi_target_do_cleanup\n");
597 cancel_delayed_work_sync(&conn->login_work);
598 conn->orig_state_change(sk);
600 iscsi_target_restore_sock_callbacks(conn);
601 iscsi_target_login_drop(conn, login);
602 iscsit_deaccess_np(np, tpg, tpg_np);
604 pr_debug("iscsi_target_do_cleanup done()\n");
607 static void iscsi_target_sk_state_change(struct sock *sk)
609 struct iscsi_conn *conn;
610 void (*orig_state_change)(struct sock *);
613 pr_debug("Entering iscsi_target_sk_state_change\n");
615 write_lock_bh(&sk->sk_callback_lock);
616 conn = sk->sk_user_data;
618 write_unlock_bh(&sk->sk_callback_lock);
621 orig_state_change = conn->orig_state_change;
623 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
624 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
626 write_unlock_bh(&sk->sk_callback_lock);
627 orig_state_change(sk);
630 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
631 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
632 " conn: %p\n", conn);
633 write_unlock_bh(&sk->sk_callback_lock);
634 orig_state_change(sk);
637 if (test_and_set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
638 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
640 write_unlock_bh(&sk->sk_callback_lock);
641 orig_state_change(sk);
645 state = iscsi_target_sk_state_check(sk);
646 write_unlock_bh(&sk->sk_callback_lock);
648 pr_debug("iscsi_target_sk_state_change: state: %d\n", state);
651 pr_debug("iscsi_target_sk_state_change got failed state\n");
652 schedule_delayed_work(&conn->login_cleanup_work, 0);
655 orig_state_change(sk);
659 * NOTE: We check for existing sessions or connections AFTER the initiator
660 * has been successfully authenticated in order to protect against faked
661 * ISID/TSIH combinations.
663 static int iscsi_target_check_for_existing_instances(
664 struct iscsi_conn *conn,
665 struct iscsi_login *login)
667 if (login->checked_for_existing)
670 login->checked_for_existing = 1;
673 return iscsi_check_for_session_reinstatement(conn);
675 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
676 login->initial_exp_statsn);
679 static int iscsi_target_do_authentication(
680 struct iscsi_conn *conn,
681 struct iscsi_login *login)
685 struct iscsi_param *param;
686 struct iscsi_login_req *login_req;
687 struct iscsi_login_rsp *login_rsp;
689 login_req = (struct iscsi_login_req *) login->req;
690 login_rsp = (struct iscsi_login_rsp *) login->rsp;
691 payload_length = ntoh24(login_req->dlength);
693 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
697 authret = iscsi_handle_authentication(
706 pr_debug("Received OK response"
707 " from LIO Authentication, continuing.\n");
710 pr_debug("iSCSI security negotiation"
711 " completed successfully.\n");
712 login->auth_complete = 1;
713 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
714 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
715 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
716 ISCSI_FLAG_LOGIN_TRANSIT);
717 login->current_stage = 1;
719 return iscsi_target_check_for_existing_instances(
722 pr_err("Security negotiation"
724 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
725 ISCSI_LOGIN_STATUS_AUTH_FAILED);
728 pr_err("Received unknown error %d from LIO"
729 " Authentication\n", authret);
730 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
731 ISCSI_LOGIN_STATUS_TARGET_ERROR);
738 static int iscsi_target_handle_csg_zero(
739 struct iscsi_conn *conn,
740 struct iscsi_login *login)
744 struct iscsi_param *param;
745 struct iscsi_login_req *login_req;
746 struct iscsi_login_rsp *login_rsp;
748 login_req = (struct iscsi_login_req *) login->req;
749 login_rsp = (struct iscsi_login_rsp *) login->rsp;
750 payload_length = ntoh24(login_req->dlength);
752 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
756 ret = iscsi_decode_text_input(
757 PHASE_SECURITY|PHASE_DECLARATIVE,
758 SENDER_INITIATOR|SENDER_RECEIVER,
766 if (login->auth_complete) {
767 pr_err("Initiator has already been"
768 " successfully authenticated, but is still"
769 " sending %s keys.\n", param->value);
770 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
771 ISCSI_LOGIN_STATUS_INIT_ERR);
776 } else if (!payload_length) {
777 pr_err("Initiator sent zero length security payload,"
779 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
780 ISCSI_LOGIN_STATUS_AUTH_FAILED);
784 if (login->first_request)
785 if (iscsi_target_check_first_request(conn, login) < 0)
788 ret = iscsi_encode_text_output(
789 PHASE_SECURITY|PHASE_DECLARATIVE,
797 if (!iscsi_check_negotiated_keys(conn->param_list)) {
798 if (conn->tpg->tpg_attrib.authentication &&
799 !strncmp(param->value, NONE, 4)) {
800 pr_err("Initiator sent AuthMethod=None but"
801 " Target is enforcing iSCSI Authentication,"
803 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
804 ISCSI_LOGIN_STATUS_AUTH_FAILED);
808 if (conn->tpg->tpg_attrib.authentication &&
809 !login->auth_complete)
812 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
815 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
816 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
817 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
818 ISCSI_FLAG_LOGIN_TRANSIT;
819 login->current_stage = 1;
825 return iscsi_target_do_authentication(conn, login);
828 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
832 struct iscsi_login_req *login_req;
833 struct iscsi_login_rsp *login_rsp;
835 login_req = (struct iscsi_login_req *) login->req;
836 login_rsp = (struct iscsi_login_rsp *) login->rsp;
837 payload_length = ntoh24(login_req->dlength);
839 ret = iscsi_decode_text_input(
840 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
841 SENDER_INITIATOR|SENDER_RECEIVER,
846 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
847 ISCSI_LOGIN_STATUS_INIT_ERR);
851 if (login->first_request)
852 if (iscsi_target_check_first_request(conn, login) < 0)
855 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
858 ret = iscsi_encode_text_output(
859 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
865 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
866 ISCSI_LOGIN_STATUS_INIT_ERR);
870 if (!login->auth_complete &&
871 conn->tpg->tpg_attrib.authentication) {
872 pr_err("Initiator is requesting CSG: 1, has not been"
873 " successfully authenticated, and the Target is"
874 " enforcing iSCSI Authentication, login failed.\n");
875 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
876 ISCSI_LOGIN_STATUS_AUTH_FAILED);
880 if (!iscsi_check_negotiated_keys(conn->param_list))
881 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
882 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
883 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
884 ISCSI_FLAG_LOGIN_TRANSIT;
889 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
892 struct iscsi_login_req *login_req;
893 struct iscsi_login_rsp *login_rsp;
895 login_req = (struct iscsi_login_req *) login->req;
896 login_rsp = (struct iscsi_login_rsp *) login->rsp;
899 if (++pdu_count > MAX_LOGIN_PDUS) {
900 pr_err("MAX_LOGIN_PDUS count reached.\n");
901 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
902 ISCSI_LOGIN_STATUS_TARGET_ERROR);
906 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
908 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
909 if (iscsi_target_handle_csg_zero(conn, login) < 0)
913 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
914 if (iscsi_target_handle_csg_one(conn, login) < 0)
916 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
917 login->tsih = conn->sess->tsih;
918 login->login_complete = 1;
919 iscsi_target_restore_sock_callbacks(conn);
920 if (iscsi_target_do_tx_login_io(conn,
927 pr_err("Illegal CSG: %d received from"
928 " Initiator, protocol error.\n",
929 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
933 if (iscsi_target_do_tx_login_io(conn, login) < 0)
936 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
937 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
938 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
944 struct sock *sk = conn->sock->sk;
947 read_lock_bh(&sk->sk_callback_lock);
948 state = iscsi_target_sk_state_check(sk);
949 read_unlock_bh(&sk->sk_callback_lock);
952 pr_debug("iscsi_target_do_login() failed state for"
953 " conn: %p\n", conn);
961 static void iscsi_initiatorname_tolower(
965 u32 iqn_size = strlen(param_buf), i;
967 for (i = 0; i < iqn_size; i++) {
977 * Processes the first Login Request..
979 int iscsi_target_locate_portal(
981 struct iscsi_conn *conn,
982 struct iscsi_login *login)
984 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
985 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
986 struct iscsi_session *sess = conn->sess;
987 struct iscsi_tiqn *tiqn;
988 struct iscsi_tpg_np *tpg_np = NULL;
989 struct iscsi_login_req *login_req;
990 struct se_node_acl *se_nacl;
991 u32 payload_length, queue_depth = 0;
992 int sessiontype = 0, ret = 0, tag_num, tag_size;
994 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
995 INIT_DELAYED_WORK(&conn->login_cleanup_work, iscsi_target_do_cleanup);
996 iscsi_target_set_sock_callbacks(conn);
1000 login_req = (struct iscsi_login_req *) login->req;
1001 payload_length = ntoh24(login_req->dlength);
1003 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1005 pr_err("Unable to allocate memory for tmpbuf.\n");
1009 memcpy(tmpbuf, login->req_buf, payload_length);
1010 tmpbuf[payload_length] = '\0';
1012 end = (start + payload_length);
1015 * Locate the initial keys expected from the Initiator node in
1016 * the first login request in order to progress with the login phase.
1018 while (start < end) {
1019 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1024 if (!strncmp(key, "InitiatorName", 13))
1026 else if (!strncmp(key, "SessionType", 11))
1028 else if (!strncmp(key, "TargetName", 10))
1031 start += strlen(key) + strlen(value) + 2;
1034 * See 5.3. Login Phase.
1037 pr_err("InitiatorName key not received"
1038 " in first login request.\n");
1039 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1040 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1045 * Convert the incoming InitiatorName to lowercase following
1046 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1047 * are NOT case sensitive.
1049 iscsi_initiatorname_tolower(i_buf);
1052 if (!login->leading_connection)
1055 pr_err("SessionType key not received"
1056 " in first login request.\n");
1057 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1058 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1064 * Use default portal group for discovery sessions.
1066 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1068 conn->tpg = iscsit_global->discovery_tpg;
1069 if (!login->leading_connection)
1072 sess->sess_ops->SessionType = 1;
1074 * Setup crc32c modules from libcrypto
1076 if (iscsi_login_setup_crypto(conn) < 0) {
1077 pr_err("iscsi_login_setup_crypto() failed\n");
1082 * Serialize access across the discovery struct iscsi_portal_group to
1083 * process login attempt.
1085 if (iscsit_access_np(np, conn->tpg) < 0) {
1086 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1087 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1097 pr_err("TargetName key not received"
1098 " in first login request while"
1099 " SessionType=Normal.\n");
1100 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1101 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1107 * Locate Target IQN from Storage Node.
1109 tiqn = iscsit_get_tiqn_for_login(t_buf);
1111 pr_err("Unable to locate Target IQN: %s in"
1112 " Storage Node\n", t_buf);
1113 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1114 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1118 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1121 * Locate Target Portal Group from Storage Node.
1123 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1125 pr_err("Unable to locate Target Portal Group"
1126 " on %s\n", tiqn->tiqn);
1127 iscsit_put_tiqn_for_login(tiqn);
1128 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1129 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1133 conn->tpg_np = tpg_np;
1134 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1136 * Setup crc32c modules from libcrypto
1138 if (iscsi_login_setup_crypto(conn) < 0) {
1139 pr_err("iscsi_login_setup_crypto() failed\n");
1140 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1141 iscsit_put_tiqn_for_login(tiqn);
1147 * Serialize access across the struct iscsi_portal_group to
1148 * process login attempt.
1150 if (iscsit_access_np(np, conn->tpg) < 0) {
1151 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1152 iscsit_put_tiqn_for_login(tiqn);
1153 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1154 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1161 * conn->sess->node_acl will be set when the referenced
1162 * struct iscsi_session is located from received ISID+TSIH in
1163 * iscsi_login_non_zero_tsih_s2().
1165 if (!login->leading_connection) {
1171 * This value is required in iscsi_login_zero_tsih_s2()
1173 sess->sess_ops->SessionType = 0;
1176 * Locate incoming Initiator IQN reference from Storage Node.
1178 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1179 &conn->tpg->tpg_se_tpg, i_buf);
1180 if (!sess->se_sess->se_node_acl) {
1181 pr_err("iSCSI Initiator Node: %s is not authorized to"
1182 " access iSCSI target portal group: %hu.\n",
1183 i_buf, conn->tpg->tpgt);
1184 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1185 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1189 se_nacl = sess->se_sess->se_node_acl;
1190 queue_depth = se_nacl->queue_depth;
1192 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1193 * depth for non immediate commands, plus extra tags for immediate
1196 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1197 * in per-cpu-ida tag allocation logic + small queue_depth.
1200 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1201 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1202 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1204 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1206 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1207 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1215 int iscsi_target_start_negotiation(
1216 struct iscsi_login *login,
1217 struct iscsi_conn *conn)
1221 ret = iscsi_target_do_login(conn, login);
1224 struct sock *sk = conn->sock->sk;
1226 write_lock_bh(&sk->sk_callback_lock);
1227 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1228 write_unlock_bh(&sk->sk_callback_lock);
1230 } else if (ret < 0) {
1231 cancel_delayed_work_sync(&conn->login_work);
1232 cancel_delayed_work_sync(&conn->login_cleanup_work);
1233 iscsi_target_restore_sock_callbacks(conn);
1234 iscsi_remove_failed_auth_entry(conn);
1237 iscsi_target_nego_release(conn);
1242 void iscsi_target_nego_release(struct iscsi_conn *conn)
1244 struct iscsi_login *login = conn->conn_login;
1249 kfree(login->req_buf);
1250 kfree(login->rsp_buf);
1253 conn->conn_login = NULL;