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 <linux/slab.h>
22 #include <linux/sched/signal.h>
24 #include <scsi/iscsi_proto.h>
25 #include <target/target_core_base.h>
26 #include <target/target_core_fabric.h>
27 #include <target/iscsi/iscsi_transport.h>
29 #include <target/iscsi/iscsi_target_core.h>
30 #include "iscsi_target_parameters.h"
31 #include "iscsi_target_login.h"
32 #include "iscsi_target_nego.h"
33 #include "iscsi_target_tpg.h"
34 #include "iscsi_target_util.h"
35 #include "iscsi_target.h"
36 #include "iscsi_target_auth.h"
38 #define MAX_LOGIN_PDUS 7
41 void convert_null_to_semi(char *buf, int len)
45 for (i = 0; i < len; i++)
50 static int strlen_semi(char *buf)
54 while (buf[i] != '\0') {
66 unsigned int max_length,
73 if (!in_buf || !pattern || !out_buf || !type)
76 ptr = strstr(in_buf, pattern);
80 ptr = strstr(ptr, "=");
85 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
86 ptr += 2; /* skip 0x */
91 len = strlen_semi(ptr);
95 if (len >= max_length) {
96 pr_err("Length of input: %d exceeds max_length:"
97 " %d\n", len, max_length);
100 memcpy(out_buf, ptr, len);
106 static u32 iscsi_handle_authentication(
107 struct iscsi_conn *conn,
112 unsigned char *authtype)
114 struct iscsi_session *sess = conn->sess;
115 struct iscsi_node_auth *auth;
116 struct iscsi_node_acl *iscsi_nacl;
117 struct iscsi_portal_group *iscsi_tpg;
118 struct se_node_acl *se_nacl;
120 if (!sess->sess_ops->SessionType) {
122 * For SessionType=Normal
124 se_nacl = conn->sess->se_sess->se_node_acl;
126 pr_err("Unable to locate struct se_node_acl for"
130 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
133 pr_err("Unable to locate struct iscsi_node_acl for"
138 if (se_nacl->dynamic_node_acl) {
139 iscsi_tpg = container_of(se_nacl->se_tpg,
140 struct iscsi_portal_group, tpg_se_tpg);
142 auth = &iscsi_tpg->tpg_demo_auth;
144 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
147 auth = &iscsi_nacl->node_auth;
151 * For SessionType=Discovery
153 auth = &iscsit_global->discovery_acl.node_auth;
156 if (strstr("CHAP", authtype))
157 strcpy(conn->sess->auth_type, "CHAP");
159 strcpy(conn->sess->auth_type, NONE);
161 if (strstr("None", authtype))
164 else if (strstr("SRP", authtype))
165 return srp_main_loop(conn, auth, in_buf, out_buf,
166 &in_length, out_length);
168 else if (strstr("CHAP", authtype))
169 return chap_main_loop(conn, auth, in_buf, out_buf,
170 &in_length, out_length);
171 else if (strstr("SPKM1", authtype))
173 else if (strstr("SPKM2", authtype))
175 else if (strstr("KRB5", authtype))
181 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
183 kfree(conn->auth_protocol);
186 int iscsi_target_check_login_request(
187 struct iscsi_conn *conn,
188 struct iscsi_login *login)
190 int req_csg, req_nsg;
192 struct iscsi_login_req *login_req;
194 login_req = (struct iscsi_login_req *) login->req;
195 payload_length = ntoh24(login_req->dlength);
197 switch (login_req->opcode & ISCSI_OPCODE_MASK) {
201 pr_err("Received unknown opcode 0x%02x.\n",
202 login_req->opcode & ISCSI_OPCODE_MASK);
203 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
204 ISCSI_LOGIN_STATUS_INIT_ERR);
208 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
209 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
210 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
211 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
212 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
213 ISCSI_LOGIN_STATUS_INIT_ERR);
217 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
218 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
220 if (req_csg != login->current_stage) {
221 pr_err("Initiator unexpectedly changed login stage"
222 " from %d to %d, login failed.\n", login->current_stage,
224 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
225 ISCSI_LOGIN_STATUS_INIT_ERR);
229 if ((req_nsg == 2) || (req_csg >= 2) ||
230 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
231 (req_nsg <= req_csg))) {
232 pr_err("Illegal login_req->flags Combination, CSG: %d,"
233 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
234 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
235 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
236 ISCSI_LOGIN_STATUS_INIT_ERR);
240 if ((login_req->max_version != login->version_max) ||
241 (login_req->min_version != login->version_min)) {
242 pr_err("Login request changed Version Max/Nin"
243 " unexpectedly to 0x%02x/0x%02x, protocol error\n",
244 login_req->max_version, login_req->min_version);
245 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
246 ISCSI_LOGIN_STATUS_INIT_ERR);
250 if (memcmp(login_req->isid, login->isid, 6) != 0) {
251 pr_err("Login request changed ISID unexpectedly,"
252 " protocol error.\n");
253 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
254 ISCSI_LOGIN_STATUS_INIT_ERR);
258 if (login_req->itt != login->init_task_tag) {
259 pr_err("Login request changed ITT unexpectedly to"
260 " 0x%08x, protocol error.\n", login_req->itt);
261 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
262 ISCSI_LOGIN_STATUS_INIT_ERR);
266 if (payload_length > MAX_KEY_VALUE_PAIRS) {
267 pr_err("Login request payload exceeds default"
268 " MaxRecvDataSegmentLength: %u, protocol error.\n",
269 MAX_KEY_VALUE_PAIRS);
275 EXPORT_SYMBOL(iscsi_target_check_login_request);
277 static int iscsi_target_check_first_request(
278 struct iscsi_conn *conn,
279 struct iscsi_login *login)
281 struct iscsi_param *param = NULL;
282 struct se_node_acl *se_nacl;
284 login->first_request = 0;
286 list_for_each_entry(param, &conn->param_list->param_list, p_list) {
287 if (!strncmp(param->name, SESSIONTYPE, 11)) {
288 if (!IS_PSTATE_ACCEPTOR(param)) {
289 pr_err("SessionType key not received"
290 " in first login request.\n");
291 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
292 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
295 if (!strncmp(param->value, DISCOVERY, 9))
299 if (!strncmp(param->name, INITIATORNAME, 13)) {
300 if (!IS_PSTATE_ACCEPTOR(param)) {
301 if (!login->leading_connection)
304 pr_err("InitiatorName key not received"
305 " in first login request.\n");
306 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
307 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
312 * For non-leading connections, double check that the
313 * received InitiatorName matches the existing session's
314 * struct iscsi_node_acl.
316 if (!login->leading_connection) {
317 se_nacl = conn->sess->se_sess->se_node_acl;
319 pr_err("Unable to locate"
320 " struct se_node_acl\n");
321 iscsit_tx_login_rsp(conn,
322 ISCSI_STATUS_CLS_INITIATOR_ERR,
323 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
327 if (strcmp(param->value,
328 se_nacl->initiatorname)) {
330 " InitiatorName: %s for this"
331 " iSCSI Initiator Node.\n",
333 iscsit_tx_login_rsp(conn,
334 ISCSI_STATUS_CLS_INITIATOR_ERR,
335 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
345 static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
348 struct iscsi_login_rsp *login_rsp;
350 login_rsp = (struct iscsi_login_rsp *) login->rsp;
352 login_rsp->opcode = ISCSI_OP_LOGIN_RSP;
353 hton24(login_rsp->dlength, login->rsp_length);
354 memcpy(login_rsp->isid, login->isid, 6);
355 login_rsp->tsih = cpu_to_be16(login->tsih);
356 login_rsp->itt = login->init_task_tag;
357 login_rsp->statsn = cpu_to_be32(conn->stat_sn++);
358 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
359 login_rsp->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
361 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
362 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
363 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
364 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
365 ntohl(login_rsp->statsn), login->rsp_length);
367 padding = ((-login->rsp_length) & 3);
369 * Before sending the last login response containing the transition
370 * bit for full-feature-phase, go ahead and start up TX/RX threads
371 * now to avoid potential resource allocation failures after the
372 * final login response has been sent.
374 if (login->login_complete) {
375 int rc = iscsit_start_kthreads(conn);
377 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
378 ISCSI_LOGIN_STATUS_NO_RESOURCES);
383 if (conn->conn_transport->iscsit_put_login_tx(conn, login,
384 login->rsp_length + padding) < 0)
387 login->rsp_length = 0;
392 if (login->login_complete) {
393 if (conn->rx_thread && conn->rx_thread_active) {
394 send_sig(SIGINT, conn->rx_thread, 1);
395 complete(&conn->rx_login_comp);
396 kthread_stop(conn->rx_thread);
398 if (conn->tx_thread && conn->tx_thread_active) {
399 send_sig(SIGINT, conn->tx_thread, 1);
400 kthread_stop(conn->tx_thread);
402 spin_lock(&iscsit_global->ts_bitmap_lock);
403 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
405 spin_unlock(&iscsit_global->ts_bitmap_lock);
410 static void iscsi_target_sk_data_ready(struct sock *sk)
412 struct iscsi_conn *conn = sk->sk_user_data;
415 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
417 write_lock_bh(&sk->sk_callback_lock);
418 if (!sk->sk_user_data) {
419 write_unlock_bh(&sk->sk_callback_lock);
422 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
423 write_unlock_bh(&sk->sk_callback_lock);
424 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
427 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
428 write_unlock_bh(&sk->sk_callback_lock);
429 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
432 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
433 write_unlock_bh(&sk->sk_callback_lock);
434 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
438 rc = schedule_delayed_work(&conn->login_work, 0);
440 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
443 write_unlock_bh(&sk->sk_callback_lock);
446 static void iscsi_target_sk_state_change(struct sock *);
448 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
456 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
458 write_lock_bh(&sk->sk_callback_lock);
459 sk->sk_user_data = conn;
460 conn->orig_data_ready = sk->sk_data_ready;
461 conn->orig_state_change = sk->sk_state_change;
462 sk->sk_data_ready = iscsi_target_sk_data_ready;
463 sk->sk_state_change = iscsi_target_sk_state_change;
464 write_unlock_bh(&sk->sk_callback_lock);
466 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
467 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
470 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
478 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
480 write_lock_bh(&sk->sk_callback_lock);
481 if (!sk->sk_user_data) {
482 write_unlock_bh(&sk->sk_callback_lock);
485 sk->sk_user_data = NULL;
486 sk->sk_data_ready = conn->orig_data_ready;
487 sk->sk_state_change = conn->orig_state_change;
488 write_unlock_bh(&sk->sk_callback_lock);
490 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
491 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
494 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
496 static bool __iscsi_target_sk_check_close(struct sock *sk)
498 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
499 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE,"
500 "returning FALSE\n");
506 static bool iscsi_target_sk_check_close(struct iscsi_conn *conn)
511 struct sock *sk = conn->sock->sk;
513 read_lock_bh(&sk->sk_callback_lock);
514 state = (__iscsi_target_sk_check_close(sk) ||
515 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
516 read_unlock_bh(&sk->sk_callback_lock);
521 static bool iscsi_target_sk_check_flag(struct iscsi_conn *conn, unsigned int flag)
526 struct sock *sk = conn->sock->sk;
528 read_lock_bh(&sk->sk_callback_lock);
529 state = test_bit(flag, &conn->login_flags);
530 read_unlock_bh(&sk->sk_callback_lock);
535 static bool iscsi_target_sk_check_and_clear(struct iscsi_conn *conn, unsigned int flag)
540 struct sock *sk = conn->sock->sk;
542 write_lock_bh(&sk->sk_callback_lock);
543 state = (__iscsi_target_sk_check_close(sk) ||
544 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
546 clear_bit(flag, &conn->login_flags);
547 write_unlock_bh(&sk->sk_callback_lock);
552 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
554 struct iscsi_np *np = login->np;
555 bool zero_tsih = login->zero_tsih;
557 iscsi_remove_failed_auth_entry(conn);
558 iscsi_target_nego_release(conn);
559 iscsi_target_login_sess_out(conn, np, zero_tsih, true);
562 struct conn_timeout {
563 struct timer_list timer;
564 struct iscsi_conn *conn;
567 static void iscsi_target_login_timeout(struct timer_list *t)
569 struct conn_timeout *timeout = from_timer(timeout, t, timer);
570 struct iscsi_conn *conn = timeout->conn;
572 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
574 if (conn->login_kworker) {
575 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
576 conn->login_kworker->comm, conn->login_kworker->pid);
577 send_sig(SIGINT, conn->login_kworker, 1);
581 static void iscsi_target_do_login_rx(struct work_struct *work)
583 struct iscsi_conn *conn = container_of(work,
584 struct iscsi_conn, login_work.work);
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;
589 struct conn_timeout timeout;
590 int rc, zero_tsih = login->zero_tsih;
593 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
594 conn, current->comm, current->pid);
596 * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready()
597 * before initial PDU processing in iscsi_target_start_negotiation()
598 * has completed, go ahead and retry until it's cleared.
600 * Otherwise if the TCP connection drops while this is occuring,
601 * iscsi_target_start_negotiation() will detect the failure, call
602 * cancel_delayed_work_sync(&conn->login_work), and cleanup the
603 * remaining iscsi connection resources from iscsi_np process context.
605 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) {
606 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10));
610 spin_lock(&tpg->tpg_state_lock);
611 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
612 spin_unlock(&tpg->tpg_state_lock);
615 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
619 if (iscsi_target_sk_check_close(conn)) {
620 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
624 conn->login_kworker = current;
625 allow_signal(SIGINT);
628 timer_setup_on_stack(&timeout.timer, iscsi_target_login_timeout, 0);
629 mod_timer(&timeout.timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
630 pr_debug("Starting login timer for %s/%d\n", current->comm, current->pid);
632 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
633 del_timer_sync(&timeout.timer);
634 destroy_timer_on_stack(&timeout.timer);
635 flush_signals(current);
636 conn->login_kworker = NULL;
641 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
642 conn, current->comm, current->pid);
644 rc = iscsi_target_do_login(conn, login);
648 if (iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_READ_ACTIVE))
650 } else if (rc == 1) {
651 iscsi_target_nego_release(conn);
652 iscsi_post_login_handler(np, conn, zero_tsih);
653 iscsit_deaccess_np(np, tpg, tpg_np);
658 iscsi_target_restore_sock_callbacks(conn);
659 iscsi_target_login_drop(conn, login);
660 iscsit_deaccess_np(np, tpg, tpg_np);
663 static void iscsi_target_sk_state_change(struct sock *sk)
665 struct iscsi_conn *conn;
666 void (*orig_state_change)(struct sock *);
669 pr_debug("Entering iscsi_target_sk_state_change\n");
671 write_lock_bh(&sk->sk_callback_lock);
672 conn = sk->sk_user_data;
674 write_unlock_bh(&sk->sk_callback_lock);
677 orig_state_change = conn->orig_state_change;
679 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
680 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
682 write_unlock_bh(&sk->sk_callback_lock);
683 orig_state_change(sk);
686 state = __iscsi_target_sk_check_close(sk);
687 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state);
689 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
690 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
691 " conn: %p\n", conn);
693 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
694 write_unlock_bh(&sk->sk_callback_lock);
695 orig_state_change(sk);
698 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
699 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
701 write_unlock_bh(&sk->sk_callback_lock);
702 orig_state_change(sk);
706 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED,
707 * but only queue conn->login_work -> iscsi_target_do_login_rx()
708 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared.
710 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close()
711 * will detect the dropped TCP connection from delayed workqueue context.
713 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial
714 * iscsi_target_start_negotiation() is running, iscsi_target_do_login()
715 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation()
716 * via iscsi_target_sk_check_and_clear() is responsible for detecting the
717 * dropped TCP connection in iscsi_np process context, and cleaning up
718 * the remaining iscsi connection resources.
721 pr_debug("iscsi_target_sk_state_change got failed state\n");
722 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
723 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
724 write_unlock_bh(&sk->sk_callback_lock);
726 orig_state_change(sk);
729 schedule_delayed_work(&conn->login_work, 0);
732 write_unlock_bh(&sk->sk_callback_lock);
734 orig_state_change(sk);
738 * NOTE: We check for existing sessions or connections AFTER the initiator
739 * has been successfully authenticated in order to protect against faked
740 * ISID/TSIH combinations.
742 static int iscsi_target_check_for_existing_instances(
743 struct iscsi_conn *conn,
744 struct iscsi_login *login)
746 if (login->checked_for_existing)
749 login->checked_for_existing = 1;
752 return iscsi_check_for_session_reinstatement(conn);
754 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
755 login->initial_exp_statsn);
758 static int iscsi_target_do_authentication(
759 struct iscsi_conn *conn,
760 struct iscsi_login *login)
764 struct iscsi_param *param;
765 struct iscsi_login_req *login_req;
766 struct iscsi_login_rsp *login_rsp;
768 login_req = (struct iscsi_login_req *) login->req;
769 login_rsp = (struct iscsi_login_rsp *) login->rsp;
770 payload_length = ntoh24(login_req->dlength);
772 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
776 authret = iscsi_handle_authentication(
785 pr_debug("Received OK response"
786 " from LIO Authentication, continuing.\n");
789 pr_debug("iSCSI security negotiation"
790 " completed successfully.\n");
791 login->auth_complete = 1;
792 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
793 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
794 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
795 ISCSI_FLAG_LOGIN_TRANSIT);
796 login->current_stage = 1;
798 return iscsi_target_check_for_existing_instances(
801 pr_err("Security negotiation"
803 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
804 ISCSI_LOGIN_STATUS_AUTH_FAILED);
807 pr_err("Received unknown error %d from LIO"
808 " Authentication\n", authret);
809 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
810 ISCSI_LOGIN_STATUS_TARGET_ERROR);
817 static int iscsi_target_handle_csg_zero(
818 struct iscsi_conn *conn,
819 struct iscsi_login *login)
823 struct iscsi_param *param;
824 struct iscsi_login_req *login_req;
825 struct iscsi_login_rsp *login_rsp;
827 login_req = (struct iscsi_login_req *) login->req;
828 login_rsp = (struct iscsi_login_rsp *) login->rsp;
829 payload_length = ntoh24(login_req->dlength);
831 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
835 ret = iscsi_decode_text_input(
836 PHASE_SECURITY|PHASE_DECLARATIVE,
837 SENDER_INITIATOR|SENDER_RECEIVER,
845 if (login->auth_complete) {
846 pr_err("Initiator has already been"
847 " successfully authenticated, but is still"
848 " sending %s keys.\n", param->value);
849 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
850 ISCSI_LOGIN_STATUS_INIT_ERR);
855 } else if (!payload_length) {
856 pr_err("Initiator sent zero length security payload,"
858 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
859 ISCSI_LOGIN_STATUS_AUTH_FAILED);
863 if (login->first_request)
864 if (iscsi_target_check_first_request(conn, login) < 0)
867 ret = iscsi_encode_text_output(
868 PHASE_SECURITY|PHASE_DECLARATIVE,
873 conn->tpg->tpg_attrib.login_keys_workaround);
877 if (!iscsi_check_negotiated_keys(conn->param_list)) {
878 if (conn->tpg->tpg_attrib.authentication &&
879 !strncmp(param->value, NONE, 4)) {
880 pr_err("Initiator sent AuthMethod=None but"
881 " Target is enforcing iSCSI Authentication,"
883 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
884 ISCSI_LOGIN_STATUS_AUTH_FAILED);
888 if (conn->tpg->tpg_attrib.authentication &&
889 !login->auth_complete)
892 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
895 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
896 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
897 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
898 ISCSI_FLAG_LOGIN_TRANSIT;
899 login->current_stage = 1;
905 return iscsi_target_do_authentication(conn, login);
908 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
912 struct iscsi_login_req *login_req;
913 struct iscsi_login_rsp *login_rsp;
915 login_req = (struct iscsi_login_req *) login->req;
916 login_rsp = (struct iscsi_login_rsp *) login->rsp;
917 payload_length = ntoh24(login_req->dlength);
919 ret = iscsi_decode_text_input(
920 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
921 SENDER_INITIATOR|SENDER_RECEIVER,
926 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
927 ISCSI_LOGIN_STATUS_INIT_ERR);
931 if (login->first_request)
932 if (iscsi_target_check_first_request(conn, login) < 0)
935 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
938 ret = iscsi_encode_text_output(
939 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
944 conn->tpg->tpg_attrib.login_keys_workaround);
946 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
947 ISCSI_LOGIN_STATUS_INIT_ERR);
951 if (!login->auth_complete &&
952 conn->tpg->tpg_attrib.authentication) {
953 pr_err("Initiator is requesting CSG: 1, has not been"
954 " successfully authenticated, and the Target is"
955 " enforcing iSCSI Authentication, login failed.\n");
956 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
957 ISCSI_LOGIN_STATUS_AUTH_FAILED);
961 if (!iscsi_check_negotiated_keys(conn->param_list))
962 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
963 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
964 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
965 ISCSI_FLAG_LOGIN_TRANSIT;
970 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
973 struct iscsi_login_req *login_req;
974 struct iscsi_login_rsp *login_rsp;
976 login_req = (struct iscsi_login_req *) login->req;
977 login_rsp = (struct iscsi_login_rsp *) login->rsp;
980 if (++pdu_count > MAX_LOGIN_PDUS) {
981 pr_err("MAX_LOGIN_PDUS count reached.\n");
982 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
983 ISCSI_LOGIN_STATUS_TARGET_ERROR);
987 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
989 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
990 if (iscsi_target_handle_csg_zero(conn, login) < 0)
994 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
995 if (iscsi_target_handle_csg_one(conn, login) < 0)
997 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
999 * Check to make sure the TCP connection has not
1000 * dropped asynchronously while session reinstatement
1001 * was occuring in this kthread context, before
1002 * transitioning to full feature phase operation.
1004 if (iscsi_target_sk_check_close(conn))
1007 login->tsih = conn->sess->tsih;
1008 login->login_complete = 1;
1009 iscsi_target_restore_sock_callbacks(conn);
1010 if (iscsi_target_do_tx_login_io(conn,
1017 pr_err("Illegal CSG: %d received from"
1018 " Initiator, protocol error.\n",
1019 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
1023 if (iscsi_target_do_tx_login_io(conn, login) < 0)
1026 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1027 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
1028 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
1036 static void iscsi_initiatorname_tolower(
1040 u32 iqn_size = strlen(param_buf), i;
1042 for (i = 0; i < iqn_size; i++) {
1052 * Processes the first Login Request..
1054 int iscsi_target_locate_portal(
1055 struct iscsi_np *np,
1056 struct iscsi_conn *conn,
1057 struct iscsi_login *login)
1059 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1060 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1061 struct iscsi_session *sess = conn->sess;
1062 struct iscsi_tiqn *tiqn;
1063 struct iscsi_tpg_np *tpg_np = NULL;
1064 struct iscsi_login_req *login_req;
1065 struct se_node_acl *se_nacl;
1066 u32 payload_length, queue_depth = 0;
1067 int sessiontype = 0, ret = 0, tag_num, tag_size;
1069 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1070 iscsi_target_set_sock_callbacks(conn);
1074 login_req = (struct iscsi_login_req *) login->req;
1075 payload_length = ntoh24(login_req->dlength);
1077 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1079 pr_err("Unable to allocate memory for tmpbuf.\n");
1083 memcpy(tmpbuf, login->req_buf, payload_length);
1084 tmpbuf[payload_length] = '\0';
1086 end = (start + payload_length);
1089 * Locate the initial keys expected from the Initiator node in
1090 * the first login request in order to progress with the login phase.
1092 while (start < end) {
1093 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1098 if (!strncmp(key, "InitiatorName", 13))
1100 else if (!strncmp(key, "SessionType", 11))
1102 else if (!strncmp(key, "TargetName", 10))
1105 start += strlen(key) + strlen(value) + 2;
1108 * See 5.3. Login Phase.
1111 pr_err("InitiatorName key not received"
1112 " in first login request.\n");
1113 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1114 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1119 * Convert the incoming InitiatorName to lowercase following
1120 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1121 * are NOT case sensitive.
1123 iscsi_initiatorname_tolower(i_buf);
1126 if (!login->leading_connection)
1129 pr_err("SessionType key not received"
1130 " in first login request.\n");
1131 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1132 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1138 * Use default portal group for discovery sessions.
1140 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1142 conn->tpg = iscsit_global->discovery_tpg;
1143 if (!login->leading_connection)
1146 sess->sess_ops->SessionType = 1;
1148 * Setup crc32c modules from libcrypto
1150 if (iscsi_login_setup_crypto(conn) < 0) {
1151 pr_err("iscsi_login_setup_crypto() failed\n");
1156 * Serialize access across the discovery struct iscsi_portal_group to
1157 * process login attempt.
1159 if (iscsit_access_np(np, conn->tpg) < 0) {
1160 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1161 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1171 pr_err("TargetName key not received"
1172 " in first login request while"
1173 " SessionType=Normal.\n");
1174 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1175 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1181 * Locate Target IQN from Storage Node.
1183 tiqn = iscsit_get_tiqn_for_login(t_buf);
1185 pr_err("Unable to locate Target IQN: %s in"
1186 " Storage Node\n", t_buf);
1187 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1188 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1192 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1195 * Locate Target Portal Group from Storage Node.
1197 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1199 pr_err("Unable to locate Target Portal Group"
1200 " on %s\n", tiqn->tiqn);
1201 iscsit_put_tiqn_for_login(tiqn);
1202 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1203 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1207 conn->tpg_np = tpg_np;
1208 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1210 * Setup crc32c modules from libcrypto
1212 if (iscsi_login_setup_crypto(conn) < 0) {
1213 pr_err("iscsi_login_setup_crypto() failed\n");
1214 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1215 iscsit_put_tiqn_for_login(tiqn);
1221 * Serialize access across the struct iscsi_portal_group to
1222 * process login attempt.
1224 if (iscsit_access_np(np, conn->tpg) < 0) {
1225 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1226 iscsit_put_tiqn_for_login(tiqn);
1227 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1228 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1235 * conn->sess->node_acl will be set when the referenced
1236 * struct iscsi_session is located from received ISID+TSIH in
1237 * iscsi_login_non_zero_tsih_s2().
1239 if (!login->leading_connection) {
1245 * This value is required in iscsi_login_zero_tsih_s2()
1247 sess->sess_ops->SessionType = 0;
1250 * Locate incoming Initiator IQN reference from Storage Node.
1252 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1253 &conn->tpg->tpg_se_tpg, i_buf);
1254 if (!sess->se_sess->se_node_acl) {
1255 pr_err("iSCSI Initiator Node: %s is not authorized to"
1256 " access iSCSI target portal group: %hu.\n",
1257 i_buf, conn->tpg->tpgt);
1258 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1259 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1263 se_nacl = sess->se_sess->se_node_acl;
1264 queue_depth = se_nacl->queue_depth;
1266 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1267 * depth for non immediate commands, plus extra tags for immediate
1270 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1271 * in per-cpu-ida tag allocation logic + small queue_depth.
1274 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1275 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1276 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1278 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1280 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1281 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1289 int iscsi_target_start_negotiation(
1290 struct iscsi_login *login,
1291 struct iscsi_conn *conn)
1296 struct sock *sk = conn->sock->sk;
1298 write_lock_bh(&sk->sk_callback_lock);
1299 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1300 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
1301 write_unlock_bh(&sk->sk_callback_lock);
1304 * If iscsi_target_do_login returns zero to signal more PDU
1305 * exchanges are required to complete the login, go ahead and
1306 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection
1309 * Otherwise if TCP connection dropped asynchronously, go ahead
1310 * and perform connection cleanup now.
1312 ret = iscsi_target_do_login(conn, login);
1313 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
1317 cancel_delayed_work_sync(&conn->login_work);
1318 iscsi_target_restore_sock_callbacks(conn);
1319 iscsi_remove_failed_auth_entry(conn);
1322 iscsi_target_nego_release(conn);
1327 void iscsi_target_nego_release(struct iscsi_conn *conn)
1329 struct iscsi_login *login = conn->conn_login;
1334 kfree(login->req_buf);
1335 kfree(login->rsp_buf);
1338 conn->conn_login = NULL;