1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3 * This file contains main functions related to iSCSI Parameter negotiation.
5 * (c) Copyright 2007-2013 Datera, Inc.
7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 ******************************************************************************/
11 #include <linux/ctype.h>
12 #include <linux/kthread.h>
13 #include <linux/slab.h>
14 #include <linux/sched/signal.h>
16 #include <scsi/iscsi_proto.h>
17 #include <target/target_core_base.h>
18 #include <target/target_core_fabric.h>
19 #include <target/iscsi/iscsi_transport.h>
21 #include <target/iscsi/iscsi_target_core.h>
22 #include "iscsi_target_parameters.h"
23 #include "iscsi_target_login.h"
24 #include "iscsi_target_nego.h"
25 #include "iscsi_target_tpg.h"
26 #include "iscsi_target_util.h"
27 #include "iscsi_target.h"
28 #include "iscsi_target_auth.h"
30 #define MAX_LOGIN_PDUS 7
32 void convert_null_to_semi(char *buf, int len)
36 for (i = 0; i < len; i++)
41 static int strlen_semi(char *buf)
45 while (buf[i] != '\0') {
57 unsigned int max_length,
64 if (!in_buf || !pattern || !out_buf || !type)
67 ptr = strstr(in_buf, pattern);
71 ptr = strstr(ptr, "=");
76 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
77 ptr += 2; /* skip 0x */
82 len = strlen_semi(ptr);
86 if (len >= max_length) {
87 pr_err("Length of input: %d exceeds max_length:"
88 " %d\n", len, max_length);
91 memcpy(out_buf, ptr, len);
97 static u32 iscsi_handle_authentication(
98 struct iscsi_conn *conn,
103 unsigned char *authtype)
105 struct iscsi_session *sess = conn->sess;
106 struct iscsi_node_auth *auth;
107 struct iscsi_node_acl *iscsi_nacl;
108 struct iscsi_portal_group *iscsi_tpg;
109 struct se_node_acl *se_nacl;
111 if (!sess->sess_ops->SessionType) {
113 * For SessionType=Normal
115 se_nacl = conn->sess->se_sess->se_node_acl;
117 pr_err("Unable to locate struct se_node_acl for"
122 if (se_nacl->dynamic_node_acl) {
123 iscsi_tpg = container_of(se_nacl->se_tpg,
124 struct iscsi_portal_group, tpg_se_tpg);
126 auth = &iscsi_tpg->tpg_demo_auth;
128 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
131 auth = &iscsi_nacl->node_auth;
135 * For SessionType=Discovery
137 auth = &iscsit_global->discovery_acl.node_auth;
140 if (strstr("CHAP", authtype))
141 strcpy(conn->sess->auth_type, "CHAP");
143 strcpy(conn->sess->auth_type, NONE);
145 if (strstr("None", authtype))
147 else if (strstr("CHAP", authtype))
148 return chap_main_loop(conn, auth, in_buf, out_buf,
149 &in_length, out_length);
150 /* SRP, SPKM1, SPKM2 and KRB5 are unsupported */
154 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
156 kfree(conn->auth_protocol);
159 int iscsi_target_check_login_request(
160 struct iscsi_conn *conn,
161 struct iscsi_login *login)
163 int req_csg, req_nsg;
165 struct iscsi_login_req *login_req;
167 login_req = (struct iscsi_login_req *) login->req;
168 payload_length = ntoh24(login_req->dlength);
170 switch (login_req->opcode & ISCSI_OPCODE_MASK) {
174 pr_err("Received unknown opcode 0x%02x.\n",
175 login_req->opcode & ISCSI_OPCODE_MASK);
176 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
177 ISCSI_LOGIN_STATUS_INIT_ERR);
181 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
182 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
183 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
184 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
185 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
186 ISCSI_LOGIN_STATUS_INIT_ERR);
190 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
191 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
193 if (req_csg != login->current_stage) {
194 pr_err("Initiator unexpectedly changed login stage"
195 " from %d to %d, login failed.\n", login->current_stage,
197 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
198 ISCSI_LOGIN_STATUS_INIT_ERR);
202 if ((req_nsg == 2) || (req_csg >= 2) ||
203 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
204 (req_nsg <= req_csg))) {
205 pr_err("Illegal login_req->flags Combination, CSG: %d,"
206 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
207 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
208 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
209 ISCSI_LOGIN_STATUS_INIT_ERR);
213 if ((login_req->max_version != login->version_max) ||
214 (login_req->min_version != login->version_min)) {
215 pr_err("Login request changed Version Max/Nin"
216 " unexpectedly to 0x%02x/0x%02x, protocol error\n",
217 login_req->max_version, login_req->min_version);
218 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
219 ISCSI_LOGIN_STATUS_INIT_ERR);
223 if (memcmp(login_req->isid, login->isid, 6) != 0) {
224 pr_err("Login request changed ISID unexpectedly,"
225 " protocol error.\n");
226 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
227 ISCSI_LOGIN_STATUS_INIT_ERR);
231 if (login_req->itt != login->init_task_tag) {
232 pr_err("Login request changed ITT unexpectedly to"
233 " 0x%08x, protocol error.\n", login_req->itt);
234 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
235 ISCSI_LOGIN_STATUS_INIT_ERR);
239 if (payload_length > MAX_KEY_VALUE_PAIRS) {
240 pr_err("Login request payload exceeds default"
241 " MaxRecvDataSegmentLength: %u, protocol error.\n",
242 MAX_KEY_VALUE_PAIRS);
248 EXPORT_SYMBOL(iscsi_target_check_login_request);
250 static int iscsi_target_check_first_request(
251 struct iscsi_conn *conn,
252 struct iscsi_login *login)
254 struct iscsi_param *param = NULL;
255 struct se_node_acl *se_nacl;
257 login->first_request = 0;
259 list_for_each_entry(param, &conn->param_list->param_list, p_list) {
260 if (!strncmp(param->name, SESSIONTYPE, 11)) {
261 if (!IS_PSTATE_ACCEPTOR(param)) {
262 pr_err("SessionType key not received"
263 " in first login request.\n");
264 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
265 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
268 if (!strncmp(param->value, DISCOVERY, 9))
272 if (!strncmp(param->name, INITIATORNAME, 13)) {
273 if (!IS_PSTATE_ACCEPTOR(param)) {
274 if (!login->leading_connection)
277 pr_err("InitiatorName key not received"
278 " in first login request.\n");
279 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
280 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
285 * For non-leading connections, double check that the
286 * received InitiatorName matches the existing session's
287 * struct iscsi_node_acl.
289 if (!login->leading_connection) {
290 se_nacl = conn->sess->se_sess->se_node_acl;
292 pr_err("Unable to locate"
293 " struct se_node_acl\n");
294 iscsit_tx_login_rsp(conn,
295 ISCSI_STATUS_CLS_INITIATOR_ERR,
296 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
300 if (strcmp(param->value,
301 se_nacl->initiatorname)) {
303 " InitiatorName: %s for this"
304 " iSCSI Initiator Node.\n",
306 iscsit_tx_login_rsp(conn,
307 ISCSI_STATUS_CLS_INITIATOR_ERR,
308 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
318 static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
321 struct iscsi_login_rsp *login_rsp;
323 login_rsp = (struct iscsi_login_rsp *) login->rsp;
325 login_rsp->opcode = ISCSI_OP_LOGIN_RSP;
326 hton24(login_rsp->dlength, login->rsp_length);
327 memcpy(login_rsp->isid, login->isid, 6);
328 login_rsp->tsih = cpu_to_be16(login->tsih);
329 login_rsp->itt = login->init_task_tag;
330 login_rsp->statsn = cpu_to_be32(conn->stat_sn++);
331 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
332 login_rsp->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
334 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
335 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
336 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
337 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
338 ntohl(login_rsp->statsn), login->rsp_length);
340 padding = ((-login->rsp_length) & 3);
342 * Before sending the last login response containing the transition
343 * bit for full-feature-phase, go ahead and start up TX/RX threads
344 * now to avoid potential resource allocation failures after the
345 * final login response has been sent.
347 if (login->login_complete) {
348 int rc = iscsit_start_kthreads(conn);
350 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
351 ISCSI_LOGIN_STATUS_NO_RESOURCES);
356 if (conn->conn_transport->iscsit_put_login_tx(conn, login,
357 login->rsp_length + padding) < 0)
360 login->rsp_length = 0;
365 if (login->login_complete) {
366 if (conn->rx_thread && conn->rx_thread_active) {
367 send_sig(SIGINT, conn->rx_thread, 1);
368 complete(&conn->rx_login_comp);
369 kthread_stop(conn->rx_thread);
371 if (conn->tx_thread && conn->tx_thread_active) {
372 send_sig(SIGINT, conn->tx_thread, 1);
373 kthread_stop(conn->tx_thread);
375 spin_lock(&iscsit_global->ts_bitmap_lock);
376 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
378 spin_unlock(&iscsit_global->ts_bitmap_lock);
383 static void iscsi_target_sk_data_ready(struct sock *sk)
385 struct iscsi_conn *conn = sk->sk_user_data;
388 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
390 write_lock_bh(&sk->sk_callback_lock);
391 if (!sk->sk_user_data) {
392 write_unlock_bh(&sk->sk_callback_lock);
395 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
396 write_unlock_bh(&sk->sk_callback_lock);
397 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
400 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
401 write_unlock_bh(&sk->sk_callback_lock);
402 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
405 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
406 write_unlock_bh(&sk->sk_callback_lock);
407 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
408 if (iscsi_target_sk_data_ready == conn->orig_data_ready)
410 conn->orig_data_ready(sk);
414 rc = schedule_delayed_work(&conn->login_work, 0);
416 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
419 write_unlock_bh(&sk->sk_callback_lock);
422 static void iscsi_target_sk_state_change(struct sock *);
424 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
432 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
434 write_lock_bh(&sk->sk_callback_lock);
435 sk->sk_user_data = conn;
436 conn->orig_data_ready = sk->sk_data_ready;
437 conn->orig_state_change = sk->sk_state_change;
438 sk->sk_data_ready = iscsi_target_sk_data_ready;
439 sk->sk_state_change = iscsi_target_sk_state_change;
440 write_unlock_bh(&sk->sk_callback_lock);
442 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
443 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
446 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
454 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
456 write_lock_bh(&sk->sk_callback_lock);
457 if (!sk->sk_user_data) {
458 write_unlock_bh(&sk->sk_callback_lock);
461 sk->sk_user_data = NULL;
462 sk->sk_data_ready = conn->orig_data_ready;
463 sk->sk_state_change = conn->orig_state_change;
464 write_unlock_bh(&sk->sk_callback_lock);
466 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
467 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
470 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
472 static bool __iscsi_target_sk_check_close(struct sock *sk)
474 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
475 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE,"
482 static bool iscsi_target_sk_check_close(struct iscsi_conn *conn)
487 struct sock *sk = conn->sock->sk;
489 read_lock_bh(&sk->sk_callback_lock);
490 state = (__iscsi_target_sk_check_close(sk) ||
491 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
492 read_unlock_bh(&sk->sk_callback_lock);
497 static bool iscsi_target_sk_check_flag(struct iscsi_conn *conn, unsigned int flag)
502 struct sock *sk = conn->sock->sk;
504 read_lock_bh(&sk->sk_callback_lock);
505 state = test_bit(flag, &conn->login_flags);
506 read_unlock_bh(&sk->sk_callback_lock);
511 static bool iscsi_target_sk_check_and_clear(struct iscsi_conn *conn, unsigned int flag)
516 struct sock *sk = conn->sock->sk;
518 write_lock_bh(&sk->sk_callback_lock);
519 state = (__iscsi_target_sk_check_close(sk) ||
520 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
522 clear_bit(flag, &conn->login_flags);
523 write_unlock_bh(&sk->sk_callback_lock);
528 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
530 bool zero_tsih = login->zero_tsih;
532 iscsi_remove_failed_auth_entry(conn);
533 iscsi_target_nego_release(conn);
534 iscsi_target_login_sess_out(conn, zero_tsih, true);
537 struct conn_timeout {
538 struct timer_list timer;
539 struct iscsi_conn *conn;
542 static void iscsi_target_login_timeout(struct timer_list *t)
544 struct conn_timeout *timeout = from_timer(timeout, t, timer);
545 struct iscsi_conn *conn = timeout->conn;
547 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
549 if (conn->login_kworker) {
550 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
551 conn->login_kworker->comm, conn->login_kworker->pid);
552 send_sig(SIGINT, conn->login_kworker, 1);
556 static void iscsi_target_do_login_rx(struct work_struct *work)
558 struct iscsi_conn *conn = container_of(work,
559 struct iscsi_conn, login_work.work);
560 struct iscsi_login *login = conn->login;
561 struct iscsi_np *np = login->np;
562 struct iscsi_portal_group *tpg = conn->tpg;
563 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
564 struct conn_timeout timeout;
565 int rc, zero_tsih = login->zero_tsih;
568 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
569 conn, current->comm, current->pid);
571 * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready()
572 * before initial PDU processing in iscsi_target_start_negotiation()
573 * has completed, go ahead and retry until it's cleared.
575 * Otherwise if the TCP connection drops while this is occuring,
576 * iscsi_target_start_negotiation() will detect the failure, call
577 * cancel_delayed_work_sync(&conn->login_work), and cleanup the
578 * remaining iscsi connection resources from iscsi_np process context.
580 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) {
581 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10));
585 spin_lock(&tpg->tpg_state_lock);
586 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
587 spin_unlock(&tpg->tpg_state_lock);
590 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
594 if (iscsi_target_sk_check_close(conn)) {
595 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
599 conn->login_kworker = current;
600 allow_signal(SIGINT);
603 timer_setup_on_stack(&timeout.timer, iscsi_target_login_timeout, 0);
604 mod_timer(&timeout.timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
605 pr_debug("Starting login timer for %s/%d\n", current->comm, current->pid);
607 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
608 del_timer_sync(&timeout.timer);
609 destroy_timer_on_stack(&timeout.timer);
610 flush_signals(current);
611 conn->login_kworker = NULL;
616 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
617 conn, current->comm, current->pid);
620 * LOGIN_FLAGS_READ_ACTIVE is cleared so that sk_data_ready
621 * could be triggered again after this.
623 * LOGIN_FLAGS_WRITE_ACTIVE is cleared after we successfully
624 * process a login PDU, so that sk_state_chage can do login
625 * cleanup as needed if the socket is closed. If a delayed work is
626 * ongoing (LOGIN_FLAGS_WRITE_ACTIVE or LOGIN_FLAGS_READ_ACTIVE),
627 * sk_state_change will leave the cleanup to the delayed work or
628 * it will schedule a delayed work to do cleanup.
631 struct sock *sk = conn->sock->sk;
633 write_lock_bh(&sk->sk_callback_lock);
634 if (!test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags)) {
635 clear_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags);
636 set_bit(LOGIN_FLAGS_WRITE_ACTIVE, &conn->login_flags);
638 write_unlock_bh(&sk->sk_callback_lock);
641 rc = iscsi_target_do_login(conn, login);
645 if (iscsi_target_sk_check_and_clear(conn,
646 LOGIN_FLAGS_WRITE_ACTIVE))
648 } else if (rc == 1) {
649 cancel_delayed_work(&conn->login_work);
650 iscsi_target_nego_release(conn);
651 iscsi_post_login_handler(np, conn, zero_tsih);
652 iscsit_deaccess_np(np, tpg, tpg_np);
657 iscsi_target_restore_sock_callbacks(conn);
658 cancel_delayed_work(&conn->login_work);
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 test_bit(LOGIN_FLAGS_WRITE_ACTIVE, &conn->login_flags)) {
691 pr_debug("Got LOGIN_FLAGS_{READ|WRITE}_ACTIVE=1"
692 " sk_state_change conn: %p\n", conn);
694 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
695 write_unlock_bh(&sk->sk_callback_lock);
696 orig_state_change(sk);
699 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
700 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
702 write_unlock_bh(&sk->sk_callback_lock);
703 orig_state_change(sk);
707 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED,
708 * but only queue conn->login_work -> iscsi_target_do_login_rx()
709 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared.
711 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close()
712 * will detect the dropped TCP connection from delayed workqueue context.
714 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial
715 * iscsi_target_start_negotiation() is running, iscsi_target_do_login()
716 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation()
717 * via iscsi_target_sk_check_and_clear() is responsible for detecting the
718 * dropped TCP connection in iscsi_np process context, and cleaning up
719 * the remaining iscsi connection resources.
722 pr_debug("iscsi_target_sk_state_change got failed state\n");
723 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
724 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
725 write_unlock_bh(&sk->sk_callback_lock);
727 orig_state_change(sk);
730 schedule_delayed_work(&conn->login_work, 0);
733 write_unlock_bh(&sk->sk_callback_lock);
735 orig_state_change(sk);
739 * NOTE: We check for existing sessions or connections AFTER the initiator
740 * has been successfully authenticated in order to protect against faked
741 * ISID/TSIH combinations.
743 static int iscsi_target_check_for_existing_instances(
744 struct iscsi_conn *conn,
745 struct iscsi_login *login)
747 if (login->checked_for_existing)
750 login->checked_for_existing = 1;
753 return iscsi_check_for_session_reinstatement(conn);
755 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
756 login->initial_exp_statsn);
759 static int iscsi_target_do_authentication(
760 struct iscsi_conn *conn,
761 struct iscsi_login *login)
765 struct iscsi_param *param;
766 struct iscsi_login_req *login_req;
767 struct iscsi_login_rsp *login_rsp;
769 login_req = (struct iscsi_login_req *) login->req;
770 login_rsp = (struct iscsi_login_rsp *) login->rsp;
771 payload_length = ntoh24(login_req->dlength);
773 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
777 authret = iscsi_handle_authentication(
786 pr_debug("Received OK response"
787 " from LIO Authentication, continuing.\n");
790 pr_debug("iSCSI security negotiation"
791 " completed successfully.\n");
792 login->auth_complete = 1;
793 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
794 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
795 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
796 ISCSI_FLAG_LOGIN_TRANSIT);
797 login->current_stage = 1;
799 return iscsi_target_check_for_existing_instances(
802 pr_err("Security negotiation"
804 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
805 ISCSI_LOGIN_STATUS_AUTH_FAILED);
808 pr_err("Received unknown error %d from LIO"
809 " Authentication\n", authret);
810 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
811 ISCSI_LOGIN_STATUS_TARGET_ERROR);
818 static int iscsi_target_handle_csg_zero(
819 struct iscsi_conn *conn,
820 struct iscsi_login *login)
824 struct iscsi_param *param;
825 struct iscsi_login_req *login_req;
826 struct iscsi_login_rsp *login_rsp;
828 login_req = (struct iscsi_login_req *) login->req;
829 login_rsp = (struct iscsi_login_rsp *) login->rsp;
830 payload_length = ntoh24(login_req->dlength);
832 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
836 ret = iscsi_decode_text_input(
837 PHASE_SECURITY|PHASE_DECLARATIVE,
838 SENDER_INITIATOR|SENDER_RECEIVER,
846 if (login->auth_complete) {
847 pr_err("Initiator has already been"
848 " successfully authenticated, but is still"
849 " sending %s keys.\n", param->value);
850 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
851 ISCSI_LOGIN_STATUS_INIT_ERR);
856 } else if (!payload_length) {
857 pr_err("Initiator sent zero length security payload,"
859 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
860 ISCSI_LOGIN_STATUS_AUTH_FAILED);
864 if (login->first_request)
865 if (iscsi_target_check_first_request(conn, login) < 0)
868 ret = iscsi_encode_text_output(
869 PHASE_SECURITY|PHASE_DECLARATIVE,
874 conn->tpg->tpg_attrib.login_keys_workaround);
878 if (!iscsi_check_negotiated_keys(conn->param_list)) {
879 if (conn->tpg->tpg_attrib.authentication &&
880 !strncmp(param->value, NONE, 4)) {
881 pr_err("Initiator sent AuthMethod=None but"
882 " Target is enforcing iSCSI Authentication,"
884 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
885 ISCSI_LOGIN_STATUS_AUTH_FAILED);
889 if (conn->tpg->tpg_attrib.authentication &&
890 !login->auth_complete)
893 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
896 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
897 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
898 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
899 ISCSI_FLAG_LOGIN_TRANSIT;
900 login->current_stage = 1;
906 return iscsi_target_do_authentication(conn, login);
909 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
913 struct iscsi_login_req *login_req;
914 struct iscsi_login_rsp *login_rsp;
916 login_req = (struct iscsi_login_req *) login->req;
917 login_rsp = (struct iscsi_login_rsp *) login->rsp;
918 payload_length = ntoh24(login_req->dlength);
920 ret = iscsi_decode_text_input(
921 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
922 SENDER_INITIATOR|SENDER_RECEIVER,
927 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
928 ISCSI_LOGIN_STATUS_INIT_ERR);
932 if (login->first_request)
933 if (iscsi_target_check_first_request(conn, login) < 0)
936 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
939 ret = iscsi_encode_text_output(
940 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
945 conn->tpg->tpg_attrib.login_keys_workaround);
947 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
948 ISCSI_LOGIN_STATUS_INIT_ERR);
952 if (!login->auth_complete &&
953 conn->tpg->tpg_attrib.authentication) {
954 pr_err("Initiator is requesting CSG: 1, has not been"
955 " successfully authenticated, and the Target is"
956 " enforcing iSCSI Authentication, login failed.\n");
957 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
958 ISCSI_LOGIN_STATUS_AUTH_FAILED);
962 if (!iscsi_check_negotiated_keys(conn->param_list))
963 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
964 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
965 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
966 ISCSI_FLAG_LOGIN_TRANSIT;
971 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
974 struct iscsi_login_req *login_req;
975 struct iscsi_login_rsp *login_rsp;
977 login_req = (struct iscsi_login_req *) login->req;
978 login_rsp = (struct iscsi_login_rsp *) login->rsp;
981 if (++pdu_count > MAX_LOGIN_PDUS) {
982 pr_err("MAX_LOGIN_PDUS count reached.\n");
983 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
984 ISCSI_LOGIN_STATUS_TARGET_ERROR);
988 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
990 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
991 if (iscsi_target_handle_csg_zero(conn, login) < 0)
995 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
996 if (iscsi_target_handle_csg_one(conn, login) < 0)
998 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1000 * Check to make sure the TCP connection has not
1001 * dropped asynchronously while session reinstatement
1002 * was occuring in this kthread context, before
1003 * transitioning to full feature phase operation.
1005 if (iscsi_target_sk_check_close(conn))
1008 login->tsih = conn->sess->tsih;
1009 login->login_complete = 1;
1010 iscsi_target_restore_sock_callbacks(conn);
1011 if (iscsi_target_do_tx_login_io(conn,
1018 pr_err("Illegal CSG: %d received from"
1019 " Initiator, protocol error.\n",
1020 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
1024 if (iscsi_target_do_tx_login_io(conn, login) < 0)
1027 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1028 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
1029 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
1037 static void iscsi_initiatorname_tolower(
1041 u32 iqn_size = strlen(param_buf), i;
1043 for (i = 0; i < iqn_size; i++) {
1053 * Processes the first Login Request..
1055 int iscsi_target_locate_portal(
1056 struct iscsi_np *np,
1057 struct iscsi_conn *conn,
1058 struct iscsi_login *login)
1060 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1061 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1062 struct iscsi_session *sess = conn->sess;
1063 struct iscsi_tiqn *tiqn;
1064 struct iscsi_tpg_np *tpg_np = NULL;
1065 struct iscsi_login_req *login_req;
1066 struct se_node_acl *se_nacl;
1067 u32 payload_length, queue_depth = 0;
1068 int sessiontype = 0, ret = 0, tag_num, tag_size;
1070 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1071 iscsi_target_set_sock_callbacks(conn);
1075 login_req = (struct iscsi_login_req *) login->req;
1076 payload_length = ntoh24(login_req->dlength);
1078 tmpbuf = kmemdup_nul(login->req_buf, payload_length, GFP_KERNEL);
1080 pr_err("Unable to allocate memory for tmpbuf.\n");
1085 end = (start + payload_length);
1088 * Locate the initial keys expected from the Initiator node in
1089 * the first login request in order to progress with the login phase.
1091 while (start < end) {
1092 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1097 if (!strncmp(key, "InitiatorName", 13))
1099 else if (!strncmp(key, "SessionType", 11))
1101 else if (!strncmp(key, "TargetName", 10))
1104 start += strlen(key) + strlen(value) + 2;
1107 * See 5.3. Login Phase.
1110 pr_err("InitiatorName key not received"
1111 " in first login request.\n");
1112 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1113 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1118 * Convert the incoming InitiatorName to lowercase following
1119 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1120 * are NOT case sensitive.
1122 iscsi_initiatorname_tolower(i_buf);
1125 if (!login->leading_connection)
1128 pr_err("SessionType key not received"
1129 " in first login request.\n");
1130 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1131 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1137 * Use default portal group for discovery sessions.
1139 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1141 conn->tpg = iscsit_global->discovery_tpg;
1142 if (!login->leading_connection)
1145 sess->sess_ops->SessionType = 1;
1147 * Setup crc32c modules from libcrypto
1149 if (iscsi_login_setup_crypto(conn) < 0) {
1150 pr_err("iscsi_login_setup_crypto() failed\n");
1155 * Serialize access across the discovery struct iscsi_portal_group to
1156 * process login attempt.
1158 if (iscsit_access_np(np, conn->tpg) < 0) {
1159 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1160 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1170 pr_err("TargetName key not received"
1171 " in first login request while"
1172 " SessionType=Normal.\n");
1173 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1174 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1180 * Locate Target IQN from Storage Node.
1182 tiqn = iscsit_get_tiqn_for_login(t_buf);
1184 pr_err("Unable to locate Target IQN: %s in"
1185 " Storage Node\n", t_buf);
1186 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1187 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1191 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1194 * Locate Target Portal Group from Storage Node.
1196 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1198 pr_err("Unable to locate Target Portal Group"
1199 " on %s\n", tiqn->tiqn);
1200 iscsit_put_tiqn_for_login(tiqn);
1201 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1202 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1206 conn->tpg_np = tpg_np;
1207 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1209 * Setup crc32c modules from libcrypto
1211 if (iscsi_login_setup_crypto(conn) < 0) {
1212 pr_err("iscsi_login_setup_crypto() failed\n");
1213 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1214 iscsit_put_tiqn_for_login(tiqn);
1220 * Serialize access across the struct iscsi_portal_group to
1221 * process login attempt.
1223 if (iscsit_access_np(np, conn->tpg) < 0) {
1224 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1225 iscsit_put_tiqn_for_login(tiqn);
1226 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1227 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1234 * conn->sess->node_acl will be set when the referenced
1235 * struct iscsi_session is located from received ISID+TSIH in
1236 * iscsi_login_non_zero_tsih_s2().
1238 if (!login->leading_connection) {
1244 * This value is required in iscsi_login_zero_tsih_s2()
1246 sess->sess_ops->SessionType = 0;
1249 * Locate incoming Initiator IQN reference from Storage Node.
1251 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1252 &conn->tpg->tpg_se_tpg, i_buf);
1253 if (!sess->se_sess->se_node_acl) {
1254 pr_err("iSCSI Initiator Node: %s is not authorized to"
1255 " access iSCSI target portal group: %hu.\n",
1256 i_buf, conn->tpg->tpgt);
1257 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1258 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1262 se_nacl = sess->se_sess->se_node_acl;
1263 queue_depth = se_nacl->queue_depth;
1265 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1266 * depth for non immediate commands, plus extra tags for immediate
1269 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1270 * in per-cpu-ida tag allocation logic + small queue_depth.
1273 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1274 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1275 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1277 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1279 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1280 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1288 int iscsi_target_start_negotiation(
1289 struct iscsi_login *login,
1290 struct iscsi_conn *conn)
1295 struct sock *sk = conn->sock->sk;
1297 write_lock_bh(&sk->sk_callback_lock);
1298 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1299 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
1300 write_unlock_bh(&sk->sk_callback_lock);
1303 * If iscsi_target_do_login returns zero to signal more PDU
1304 * exchanges are required to complete the login, go ahead and
1305 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection
1308 * Otherwise if TCP connection dropped asynchronously, go ahead
1309 * and perform connection cleanup now.
1311 ret = iscsi_target_do_login(conn, login);
1312 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
1316 cancel_delayed_work_sync(&conn->login_work);
1317 iscsi_target_restore_sock_callbacks(conn);
1318 iscsi_remove_failed_auth_entry(conn);
1321 iscsi_target_nego_release(conn);
1326 void iscsi_target_nego_release(struct iscsi_conn *conn)
1328 struct iscsi_login *login = conn->conn_login;
1333 kfree(login->req_buf);
1334 kfree(login->rsp_buf);
1337 conn->conn_login = NULL;