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_login_rsp *login_rsp;
345 login_rsp = (struct iscsi_login_rsp *) login->rsp;
347 login_rsp->opcode = ISCSI_OP_LOGIN_RSP;
348 hton24(login_rsp->dlength, login->rsp_length);
349 memcpy(login_rsp->isid, login->isid, 6);
350 login_rsp->tsih = cpu_to_be16(login->tsih);
351 login_rsp->itt = login->init_task_tag;
352 login_rsp->statsn = cpu_to_be32(conn->stat_sn++);
353 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
354 login_rsp->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
356 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
357 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
358 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
359 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
360 ntohl(login_rsp->statsn), login->rsp_length);
362 padding = ((-login->rsp_length) & 3);
364 if (conn->conn_transport->iscsit_put_login_tx(conn, login,
365 login->rsp_length + padding) < 0)
368 login->rsp_length = 0;
373 static void iscsi_target_sk_data_ready(struct sock *sk)
375 struct iscsi_conn *conn = sk->sk_user_data;
378 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
380 write_lock_bh(&sk->sk_callback_lock);
381 if (!sk->sk_user_data) {
382 write_unlock_bh(&sk->sk_callback_lock);
385 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
386 write_unlock_bh(&sk->sk_callback_lock);
387 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
390 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
391 write_unlock_bh(&sk->sk_callback_lock);
392 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
395 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
396 write_unlock_bh(&sk->sk_callback_lock);
397 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
401 rc = schedule_delayed_work(&conn->login_work, 0);
403 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
406 write_unlock_bh(&sk->sk_callback_lock);
409 static void iscsi_target_sk_state_change(struct sock *);
411 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
419 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
421 write_lock_bh(&sk->sk_callback_lock);
422 sk->sk_user_data = conn;
423 conn->orig_data_ready = sk->sk_data_ready;
424 conn->orig_state_change = sk->sk_state_change;
425 sk->sk_data_ready = iscsi_target_sk_data_ready;
426 sk->sk_state_change = iscsi_target_sk_state_change;
427 write_unlock_bh(&sk->sk_callback_lock);
429 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
430 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
433 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
441 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
443 write_lock_bh(&sk->sk_callback_lock);
444 if (!sk->sk_user_data) {
445 write_unlock_bh(&sk->sk_callback_lock);
448 sk->sk_user_data = NULL;
449 sk->sk_data_ready = conn->orig_data_ready;
450 sk->sk_state_change = conn->orig_state_change;
451 write_unlock_bh(&sk->sk_callback_lock);
453 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
454 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
457 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
459 static bool iscsi_target_sk_state_check(struct sock *sk)
461 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
462 pr_debug("iscsi_target_sk_state_check: TCP_CLOSE_WAIT|TCP_CLOSE,"
463 "returning FALSE\n");
469 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
471 struct iscsi_np *np = login->np;
472 bool zero_tsih = login->zero_tsih;
474 iscsi_remove_failed_auth_entry(conn);
475 iscsi_target_nego_release(conn);
476 iscsi_target_login_sess_out(conn, np, zero_tsih, true);
479 static void iscsi_target_login_timeout(unsigned long data)
481 struct iscsi_conn *conn = (struct iscsi_conn *)data;
483 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
485 if (conn->login_kworker) {
486 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
487 conn->login_kworker->comm, conn->login_kworker->pid);
488 send_sig(SIGINT, conn->login_kworker, 1);
492 static void iscsi_target_do_login_rx(struct work_struct *work)
494 struct iscsi_conn *conn = container_of(work,
495 struct iscsi_conn, login_work.work);
496 struct iscsi_login *login = conn->login;
497 struct iscsi_np *np = login->np;
498 struct iscsi_portal_group *tpg = conn->tpg;
499 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
500 struct timer_list login_timer;
501 int rc, zero_tsih = login->zero_tsih;
504 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
505 conn, current->comm, current->pid);
507 spin_lock(&tpg->tpg_state_lock);
508 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
509 spin_unlock(&tpg->tpg_state_lock);
512 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
513 iscsi_target_restore_sock_callbacks(conn);
514 iscsi_target_login_drop(conn, login);
515 iscsit_deaccess_np(np, tpg, tpg_np);
520 struct sock *sk = conn->sock->sk;
522 read_lock_bh(&sk->sk_callback_lock);
523 state = iscsi_target_sk_state_check(sk);
524 read_unlock_bh(&sk->sk_callback_lock);
527 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
528 iscsi_target_restore_sock_callbacks(conn);
529 iscsi_target_login_drop(conn, login);
530 iscsit_deaccess_np(np, tpg, tpg_np);
535 conn->login_kworker = current;
536 allow_signal(SIGINT);
538 init_timer(&login_timer);
539 login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
540 login_timer.data = (unsigned long)conn;
541 login_timer.function = iscsi_target_login_timeout;
542 add_timer(&login_timer);
543 pr_debug("Starting login_timer for %s/%d\n", current->comm, current->pid);
545 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
546 del_timer_sync(&login_timer);
547 flush_signals(current);
548 conn->login_kworker = NULL;
551 iscsi_target_restore_sock_callbacks(conn);
552 iscsi_target_login_drop(conn, login);
553 iscsit_deaccess_np(np, tpg, tpg_np);
557 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
558 conn, current->comm, current->pid);
560 rc = iscsi_target_do_login(conn, login);
562 iscsi_target_restore_sock_callbacks(conn);
563 iscsi_target_login_drop(conn, login);
564 iscsit_deaccess_np(np, tpg, tpg_np);
567 struct sock *sk = conn->sock->sk;
569 write_lock_bh(&sk->sk_callback_lock);
570 clear_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags);
571 write_unlock_bh(&sk->sk_callback_lock);
573 } else if (rc == 1) {
574 iscsi_target_nego_release(conn);
575 iscsi_post_login_handler(np, conn, zero_tsih);
576 iscsit_deaccess_np(np, tpg, tpg_np);
580 static void iscsi_target_do_cleanup(struct work_struct *work)
582 struct iscsi_conn *conn = container_of(work,
583 struct iscsi_conn, login_cleanup_work.work);
584 struct sock *sk = conn->sock->sk;
585 struct iscsi_login *login = conn->login;
586 struct iscsi_np *np = login->np;
587 struct iscsi_portal_group *tpg = conn->tpg;
588 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
590 pr_debug("Entering iscsi_target_do_cleanup\n");
592 cancel_delayed_work_sync(&conn->login_work);
593 conn->orig_state_change(sk);
595 iscsi_target_restore_sock_callbacks(conn);
596 iscsi_target_login_drop(conn, login);
597 iscsit_deaccess_np(np, tpg, tpg_np);
599 pr_debug("iscsi_target_do_cleanup done()\n");
602 static void iscsi_target_sk_state_change(struct sock *sk)
604 struct iscsi_conn *conn;
605 void (*orig_state_change)(struct sock *);
608 pr_debug("Entering iscsi_target_sk_state_change\n");
610 write_lock_bh(&sk->sk_callback_lock);
611 conn = sk->sk_user_data;
613 write_unlock_bh(&sk->sk_callback_lock);
616 orig_state_change = conn->orig_state_change;
618 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
619 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
621 write_unlock_bh(&sk->sk_callback_lock);
622 orig_state_change(sk);
625 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
626 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
627 " conn: %p\n", conn);
628 write_unlock_bh(&sk->sk_callback_lock);
629 orig_state_change(sk);
632 if (test_and_set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
633 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
635 write_unlock_bh(&sk->sk_callback_lock);
636 orig_state_change(sk);
640 state = iscsi_target_sk_state_check(sk);
641 write_unlock_bh(&sk->sk_callback_lock);
643 pr_debug("iscsi_target_sk_state_change: state: %d\n", state);
646 pr_debug("iscsi_target_sk_state_change got failed state\n");
647 schedule_delayed_work(&conn->login_cleanup_work, 0);
650 orig_state_change(sk);
654 * NOTE: We check for existing sessions or connections AFTER the initiator
655 * has been successfully authenticated in order to protect against faked
656 * ISID/TSIH combinations.
658 static int iscsi_target_check_for_existing_instances(
659 struct iscsi_conn *conn,
660 struct iscsi_login *login)
662 if (login->checked_for_existing)
665 login->checked_for_existing = 1;
668 return iscsi_check_for_session_reinstatement(conn);
670 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
671 login->initial_exp_statsn);
674 static int iscsi_target_do_authentication(
675 struct iscsi_conn *conn,
676 struct iscsi_login *login)
680 struct iscsi_param *param;
681 struct iscsi_login_req *login_req;
682 struct iscsi_login_rsp *login_rsp;
684 login_req = (struct iscsi_login_req *) login->req;
685 login_rsp = (struct iscsi_login_rsp *) login->rsp;
686 payload_length = ntoh24(login_req->dlength);
688 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
692 authret = iscsi_handle_authentication(
701 pr_debug("Received OK response"
702 " from LIO Authentication, continuing.\n");
705 pr_debug("iSCSI security negotiation"
706 " completed successfully.\n");
707 login->auth_complete = 1;
708 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
709 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
710 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
711 ISCSI_FLAG_LOGIN_TRANSIT);
712 login->current_stage = 1;
714 return iscsi_target_check_for_existing_instances(
717 pr_err("Security negotiation"
719 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
720 ISCSI_LOGIN_STATUS_AUTH_FAILED);
723 pr_err("Received unknown error %d from LIO"
724 " Authentication\n", authret);
725 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
726 ISCSI_LOGIN_STATUS_TARGET_ERROR);
733 static int iscsi_target_handle_csg_zero(
734 struct iscsi_conn *conn,
735 struct iscsi_login *login)
739 struct iscsi_param *param;
740 struct iscsi_login_req *login_req;
741 struct iscsi_login_rsp *login_rsp;
743 login_req = (struct iscsi_login_req *) login->req;
744 login_rsp = (struct iscsi_login_rsp *) login->rsp;
745 payload_length = ntoh24(login_req->dlength);
747 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
751 ret = iscsi_decode_text_input(
752 PHASE_SECURITY|PHASE_DECLARATIVE,
753 SENDER_INITIATOR|SENDER_RECEIVER,
761 if (login->auth_complete) {
762 pr_err("Initiator has already been"
763 " successfully authenticated, but is still"
764 " sending %s keys.\n", param->value);
765 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
766 ISCSI_LOGIN_STATUS_INIT_ERR);
771 } else if (!payload_length) {
772 pr_err("Initiator sent zero length security payload,"
774 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
775 ISCSI_LOGIN_STATUS_AUTH_FAILED);
779 if (login->first_request)
780 if (iscsi_target_check_first_request(conn, login) < 0)
783 ret = iscsi_encode_text_output(
784 PHASE_SECURITY|PHASE_DECLARATIVE,
792 if (!iscsi_check_negotiated_keys(conn->param_list)) {
793 if (conn->tpg->tpg_attrib.authentication &&
794 !strncmp(param->value, NONE, 4)) {
795 pr_err("Initiator sent AuthMethod=None but"
796 " Target is enforcing iSCSI Authentication,"
798 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
799 ISCSI_LOGIN_STATUS_AUTH_FAILED);
803 if (conn->tpg->tpg_attrib.authentication &&
804 !login->auth_complete)
807 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
810 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
811 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
812 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
813 ISCSI_FLAG_LOGIN_TRANSIT;
814 login->current_stage = 1;
820 return iscsi_target_do_authentication(conn, login);
823 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
827 struct iscsi_login_req *login_req;
828 struct iscsi_login_rsp *login_rsp;
830 login_req = (struct iscsi_login_req *) login->req;
831 login_rsp = (struct iscsi_login_rsp *) login->rsp;
832 payload_length = ntoh24(login_req->dlength);
834 ret = iscsi_decode_text_input(
835 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
836 SENDER_INITIATOR|SENDER_RECEIVER,
841 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
842 ISCSI_LOGIN_STATUS_INIT_ERR);
846 if (login->first_request)
847 if (iscsi_target_check_first_request(conn, login) < 0)
850 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
853 ret = iscsi_encode_text_output(
854 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
860 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
861 ISCSI_LOGIN_STATUS_INIT_ERR);
865 if (!login->auth_complete &&
866 conn->tpg->tpg_attrib.authentication) {
867 pr_err("Initiator is requesting CSG: 1, has not been"
868 " successfully authenticated, and the Target is"
869 " enforcing iSCSI Authentication, login failed.\n");
870 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
871 ISCSI_LOGIN_STATUS_AUTH_FAILED);
875 if (!iscsi_check_negotiated_keys(conn->param_list))
876 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
877 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
878 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
879 ISCSI_FLAG_LOGIN_TRANSIT;
884 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
887 struct iscsi_login_req *login_req;
888 struct iscsi_login_rsp *login_rsp;
890 login_req = (struct iscsi_login_req *) login->req;
891 login_rsp = (struct iscsi_login_rsp *) login->rsp;
894 if (++pdu_count > MAX_LOGIN_PDUS) {
895 pr_err("MAX_LOGIN_PDUS count reached.\n");
896 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
897 ISCSI_LOGIN_STATUS_TARGET_ERROR);
901 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
903 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
904 if (iscsi_target_handle_csg_zero(conn, login) < 0)
908 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
909 if (iscsi_target_handle_csg_one(conn, login) < 0)
911 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
912 login->tsih = conn->sess->tsih;
913 login->login_complete = 1;
914 iscsi_target_restore_sock_callbacks(conn);
915 if (iscsi_target_do_tx_login_io(conn,
922 pr_err("Illegal CSG: %d received from"
923 " Initiator, protocol error.\n",
924 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
928 if (iscsi_target_do_tx_login_io(conn, login) < 0)
931 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
932 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
933 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
939 struct sock *sk = conn->sock->sk;
942 read_lock_bh(&sk->sk_callback_lock);
943 state = iscsi_target_sk_state_check(sk);
944 read_unlock_bh(&sk->sk_callback_lock);
947 pr_debug("iscsi_target_do_login() failed state for"
948 " conn: %p\n", conn);
956 static void iscsi_initiatorname_tolower(
960 u32 iqn_size = strlen(param_buf), i;
962 for (i = 0; i < iqn_size; i++) {
972 * Processes the first Login Request..
974 int iscsi_target_locate_portal(
976 struct iscsi_conn *conn,
977 struct iscsi_login *login)
979 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
980 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
981 struct iscsi_session *sess = conn->sess;
982 struct iscsi_tiqn *tiqn;
983 struct iscsi_tpg_np *tpg_np = NULL;
984 struct iscsi_login_req *login_req;
985 struct se_node_acl *se_nacl;
986 u32 payload_length, queue_depth = 0;
987 int sessiontype = 0, ret = 0, tag_num, tag_size;
989 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
990 INIT_DELAYED_WORK(&conn->login_cleanup_work, iscsi_target_do_cleanup);
991 iscsi_target_set_sock_callbacks(conn);
995 login_req = (struct iscsi_login_req *) login->req;
996 payload_length = ntoh24(login_req->dlength);
998 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1000 pr_err("Unable to allocate memory for tmpbuf.\n");
1004 memcpy(tmpbuf, login->req_buf, payload_length);
1005 tmpbuf[payload_length] = '\0';
1007 end = (start + payload_length);
1010 * Locate the initial keys expected from the Initiator node in
1011 * the first login request in order to progress with the login phase.
1013 while (start < end) {
1014 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1019 if (!strncmp(key, "InitiatorName", 13))
1021 else if (!strncmp(key, "SessionType", 11))
1023 else if (!strncmp(key, "TargetName", 10))
1026 start += strlen(key) + strlen(value) + 2;
1029 * See 5.3. Login Phase.
1032 pr_err("InitiatorName key not received"
1033 " in first login request.\n");
1034 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1035 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1040 * Convert the incoming InitiatorName to lowercase following
1041 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1042 * are NOT case sensitive.
1044 iscsi_initiatorname_tolower(i_buf);
1047 if (!login->leading_connection)
1050 pr_err("SessionType key not received"
1051 " in first login request.\n");
1052 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1053 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1059 * Use default portal group for discovery sessions.
1061 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1063 conn->tpg = iscsit_global->discovery_tpg;
1064 if (!login->leading_connection)
1067 sess->sess_ops->SessionType = 1;
1069 * Setup crc32c modules from libcrypto
1071 if (iscsi_login_setup_crypto(conn) < 0) {
1072 pr_err("iscsi_login_setup_crypto() failed\n");
1077 * Serialize access across the discovery struct iscsi_portal_group to
1078 * process login attempt.
1080 if (iscsit_access_np(np, conn->tpg) < 0) {
1081 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1082 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1092 pr_err("TargetName key not received"
1093 " in first login request while"
1094 " SessionType=Normal.\n");
1095 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1096 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1102 * Locate Target IQN from Storage Node.
1104 tiqn = iscsit_get_tiqn_for_login(t_buf);
1106 pr_err("Unable to locate Target IQN: %s in"
1107 " Storage Node\n", t_buf);
1108 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1109 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1113 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1116 * Locate Target Portal Group from Storage Node.
1118 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1120 pr_err("Unable to locate Target Portal Group"
1121 " on %s\n", tiqn->tiqn);
1122 iscsit_put_tiqn_for_login(tiqn);
1123 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1124 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1128 conn->tpg_np = tpg_np;
1129 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1131 * Setup crc32c modules from libcrypto
1133 if (iscsi_login_setup_crypto(conn) < 0) {
1134 pr_err("iscsi_login_setup_crypto() failed\n");
1135 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1136 iscsit_put_tiqn_for_login(tiqn);
1142 * Serialize access across the struct iscsi_portal_group to
1143 * process login attempt.
1145 if (iscsit_access_np(np, conn->tpg) < 0) {
1146 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1147 iscsit_put_tiqn_for_login(tiqn);
1148 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1149 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1156 * conn->sess->node_acl will be set when the referenced
1157 * struct iscsi_session is located from received ISID+TSIH in
1158 * iscsi_login_non_zero_tsih_s2().
1160 if (!login->leading_connection) {
1166 * This value is required in iscsi_login_zero_tsih_s2()
1168 sess->sess_ops->SessionType = 0;
1171 * Locate incoming Initiator IQN reference from Storage Node.
1173 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1174 &conn->tpg->tpg_se_tpg, i_buf);
1175 if (!sess->se_sess->se_node_acl) {
1176 pr_err("iSCSI Initiator Node: %s is not authorized to"
1177 " access iSCSI target portal group: %hu.\n",
1178 i_buf, conn->tpg->tpgt);
1179 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1180 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1184 se_nacl = sess->se_sess->se_node_acl;
1185 queue_depth = se_nacl->queue_depth;
1187 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1188 * depth for non immediate commands, plus extra tags for immediate
1191 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1192 * in per-cpu-ida tag allocation logic + small queue_depth.
1195 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1196 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1197 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1199 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1201 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1202 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1210 int iscsi_target_start_negotiation(
1211 struct iscsi_login *login,
1212 struct iscsi_conn *conn)
1216 ret = iscsi_target_do_login(conn, login);
1219 struct sock *sk = conn->sock->sk;
1221 write_lock_bh(&sk->sk_callback_lock);
1222 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1223 write_unlock_bh(&sk->sk_callback_lock);
1225 } else if (ret < 0) {
1226 cancel_delayed_work_sync(&conn->login_work);
1227 cancel_delayed_work_sync(&conn->login_cleanup_work);
1228 iscsi_target_restore_sock_callbacks(conn);
1229 iscsi_remove_failed_auth_entry(conn);
1232 iscsi_target_nego_release(conn);
1237 void iscsi_target_nego_release(struct iscsi_conn *conn)
1239 struct iscsi_login *login = conn->conn_login;
1244 kfree(login->req_buf);
1245 kfree(login->rsp_buf);
1248 conn->conn_login = NULL;