1 /*******************************************************************************
2 * This file contains main functions related to iSCSI Parameter negotiation.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
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.
12 *
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 ******************************************************************************/
18
19 #include <linux/ctype.h>
20 #include <linux/kthread.h>
21 #include <linux/slab.h>
22 #include <linux/sched/signal.h>
23 #include <net/sock.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>
28
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"
37
38 #define MAX_LOGIN_PDUS 7
39 #define TEXT_LEN 4096
40
convert_null_to_semi(char * buf,int len)41 void convert_null_to_semi(char *buf, int len)
42 {
43 int i;
44
45 for (i = 0; i < len; i++)
46 if (buf[i] == '\0')
47 buf[i] = ';';
48 }
49
strlen_semi(char * buf)50 static int strlen_semi(char *buf)
51 {
52 int i = 0;
53
54 while (buf[i] != '\0') {
55 if (buf[i] == ';')
56 return i;
57 i++;
58 }
59
60 return -1;
61 }
62
extract_param(const char * in_buf,const char * pattern,unsigned int max_length,char * out_buf,unsigned char * type)63 int extract_param(
64 const char *in_buf,
65 const char *pattern,
66 unsigned int max_length,
67 char *out_buf,
68 unsigned char *type)
69 {
70 char *ptr;
71 int len;
72
73 if (!in_buf || !pattern || !out_buf || !type)
74 return -1;
75
76 ptr = strstr(in_buf, pattern);
77 if (!ptr)
78 return -1;
79
80 ptr = strstr(ptr, "=");
81 if (!ptr)
82 return -1;
83
84 ptr += 1;
85 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
86 ptr += 2; /* skip 0x */
87 *type = HEX;
88 } else
89 *type = DECIMAL;
90
91 len = strlen_semi(ptr);
92 if (len < 0)
93 return -1;
94
95 if (len >= max_length) {
96 pr_err("Length of input: %d exceeds max_length:"
97 " %d\n", len, max_length);
98 return -1;
99 }
100 memcpy(out_buf, ptr, len);
101 out_buf[len] = '\0';
102
103 return 0;
104 }
105
iscsi_handle_authentication(struct iscsi_conn * conn,char * in_buf,char * out_buf,int in_length,int * out_length,unsigned char * authtype)106 static u32 iscsi_handle_authentication(
107 struct iscsi_conn *conn,
108 char *in_buf,
109 char *out_buf,
110 int in_length,
111 int *out_length,
112 unsigned char *authtype)
113 {
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;
119
120 if (!sess->sess_ops->SessionType) {
121 /*
122 * For SessionType=Normal
123 */
124 se_nacl = conn->sess->se_sess->se_node_acl;
125 if (!se_nacl) {
126 pr_err("Unable to locate struct se_node_acl for"
127 " CHAP auth\n");
128 return -1;
129 }
130 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
131 se_node_acl);
132 if (!iscsi_nacl) {
133 pr_err("Unable to locate struct iscsi_node_acl for"
134 " CHAP auth\n");
135 return -1;
136 }
137
138 if (se_nacl->dynamic_node_acl) {
139 iscsi_tpg = container_of(se_nacl->se_tpg,
140 struct iscsi_portal_group, tpg_se_tpg);
141
142 auth = &iscsi_tpg->tpg_demo_auth;
143 } else {
144 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
145 se_node_acl);
146
147 auth = &iscsi_nacl->node_auth;
148 }
149 } else {
150 /*
151 * For SessionType=Discovery
152 */
153 auth = &iscsit_global->discovery_acl.node_auth;
154 }
155
156 if (strstr("CHAP", authtype))
157 strcpy(conn->sess->auth_type, "CHAP");
158 else
159 strcpy(conn->sess->auth_type, NONE);
160
161 if (strstr("None", authtype))
162 return 1;
163 #ifdef CANSRP
164 else if (strstr("SRP", authtype))
165 return srp_main_loop(conn, auth, in_buf, out_buf,
166 &in_length, out_length);
167 #endif
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))
172 return 2;
173 else if (strstr("SPKM2", authtype))
174 return 2;
175 else if (strstr("KRB5", authtype))
176 return 2;
177 else
178 return 2;
179 }
180
iscsi_remove_failed_auth_entry(struct iscsi_conn * conn)181 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
182 {
183 kfree(conn->auth_protocol);
184 }
185
iscsi_target_check_login_request(struct iscsi_conn * conn,struct iscsi_login * login)186 int iscsi_target_check_login_request(
187 struct iscsi_conn *conn,
188 struct iscsi_login *login)
189 {
190 int req_csg, req_nsg;
191 u32 payload_length;
192 struct iscsi_login_req *login_req;
193
194 login_req = (struct iscsi_login_req *) login->req;
195 payload_length = ntoh24(login_req->dlength);
196
197 switch (login_req->opcode & ISCSI_OPCODE_MASK) {
198 case ISCSI_OP_LOGIN:
199 break;
200 default:
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);
205 return -1;
206 }
207
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);
214 return -1;
215 }
216
217 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
218 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
219
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,
223 req_csg);
224 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
225 ISCSI_LOGIN_STATUS_INIT_ERR);
226 return -1;
227 }
228
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);
237 return -1;
238 }
239
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);
247 return -1;
248 }
249
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);
255 return -1;
256 }
257
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);
263 return -1;
264 }
265
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);
270 return -1;
271 }
272
273 return 0;
274 }
275 EXPORT_SYMBOL(iscsi_target_check_login_request);
276
iscsi_target_check_first_request(struct iscsi_conn * conn,struct iscsi_login * login)277 static int iscsi_target_check_first_request(
278 struct iscsi_conn *conn,
279 struct iscsi_login *login)
280 {
281 struct iscsi_param *param = NULL;
282 struct se_node_acl *se_nacl;
283
284 login->first_request = 0;
285
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);
293 return -1;
294 }
295 if (!strncmp(param->value, DISCOVERY, 9))
296 return 0;
297 }
298
299 if (!strncmp(param->name, INITIATORNAME, 13)) {
300 if (!IS_PSTATE_ACCEPTOR(param)) {
301 if (!login->leading_connection)
302 continue;
303
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);
308 return -1;
309 }
310
311 /*
312 * For non-leading connections, double check that the
313 * received InitiatorName matches the existing session's
314 * struct iscsi_node_acl.
315 */
316 if (!login->leading_connection) {
317 se_nacl = conn->sess->se_sess->se_node_acl;
318 if (!se_nacl) {
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);
324 return -1;
325 }
326
327 if (strcmp(param->value,
328 se_nacl->initiatorname)) {
329 pr_err("Incorrect"
330 " InitiatorName: %s for this"
331 " iSCSI Initiator Node.\n",
332 param->value);
333 iscsit_tx_login_rsp(conn,
334 ISCSI_STATUS_CLS_INITIATOR_ERR,
335 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
336 return -1;
337 }
338 }
339 }
340 }
341
342 return 0;
343 }
344
iscsi_target_do_tx_login_io(struct iscsi_conn * conn,struct iscsi_login * login)345 static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
346 {
347 u32 padding = 0;
348 struct iscsi_login_rsp *login_rsp;
349
350 login_rsp = (struct iscsi_login_rsp *) login->rsp;
351
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));
360
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);
366
367 padding = ((-login->rsp_length) & 3);
368 /*
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.
373 */
374 if (login->login_complete) {
375 int rc = iscsit_start_kthreads(conn);
376 if (rc) {
377 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
378 ISCSI_LOGIN_STATUS_NO_RESOURCES);
379 return -1;
380 }
381 }
382
383 if (conn->conn_transport->iscsit_put_login_tx(conn, login,
384 login->rsp_length + padding) < 0)
385 goto err;
386
387 login->rsp_length = 0;
388
389 return 0;
390
391 err:
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);
397 }
398 if (conn->tx_thread && conn->tx_thread_active) {
399 send_sig(SIGINT, conn->tx_thread, 1);
400 kthread_stop(conn->tx_thread);
401 }
402 spin_lock(&iscsit_global->ts_bitmap_lock);
403 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
404 get_order(1));
405 spin_unlock(&iscsit_global->ts_bitmap_lock);
406 }
407 return -1;
408 }
409
iscsi_target_sk_data_ready(struct sock * sk)410 static void iscsi_target_sk_data_ready(struct sock *sk)
411 {
412 struct iscsi_conn *conn = sk->sk_user_data;
413 bool rc;
414
415 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
416
417 write_lock_bh(&sk->sk_callback_lock);
418 if (!sk->sk_user_data) {
419 write_unlock_bh(&sk->sk_callback_lock);
420 return;
421 }
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);
425 return;
426 }
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);
430 return;
431 }
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);
435 if (iscsi_target_sk_data_ready == conn->orig_data_ready)
436 return;
437 conn->orig_data_ready(sk);
438 return;
439 }
440
441 rc = schedule_delayed_work(&conn->login_work, 0);
442 if (!rc) {
443 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
444 " got false\n");
445 }
446 write_unlock_bh(&sk->sk_callback_lock);
447 }
448
449 static void iscsi_target_sk_state_change(struct sock *);
450
iscsi_target_set_sock_callbacks(struct iscsi_conn * conn)451 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
452 {
453 struct sock *sk;
454
455 if (!conn->sock)
456 return;
457
458 sk = conn->sock->sk;
459 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
460
461 write_lock_bh(&sk->sk_callback_lock);
462 sk->sk_user_data = conn;
463 conn->orig_data_ready = sk->sk_data_ready;
464 conn->orig_state_change = sk->sk_state_change;
465 sk->sk_data_ready = iscsi_target_sk_data_ready;
466 sk->sk_state_change = iscsi_target_sk_state_change;
467 write_unlock_bh(&sk->sk_callback_lock);
468
469 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
470 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
471 }
472
iscsi_target_restore_sock_callbacks(struct iscsi_conn * conn)473 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
474 {
475 struct sock *sk;
476
477 if (!conn->sock)
478 return;
479
480 sk = conn->sock->sk;
481 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
482
483 write_lock_bh(&sk->sk_callback_lock);
484 if (!sk->sk_user_data) {
485 write_unlock_bh(&sk->sk_callback_lock);
486 return;
487 }
488 sk->sk_user_data = NULL;
489 sk->sk_data_ready = conn->orig_data_ready;
490 sk->sk_state_change = conn->orig_state_change;
491 write_unlock_bh(&sk->sk_callback_lock);
492
493 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
494 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
495 }
496
497 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
498
__iscsi_target_sk_check_close(struct sock * sk)499 static bool __iscsi_target_sk_check_close(struct sock *sk)
500 {
501 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
502 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE,"
503 "returning FALSE\n");
504 return true;
505 }
506 return false;
507 }
508
iscsi_target_sk_check_close(struct iscsi_conn * conn)509 static bool iscsi_target_sk_check_close(struct iscsi_conn *conn)
510 {
511 bool state = false;
512
513 if (conn->sock) {
514 struct sock *sk = conn->sock->sk;
515
516 read_lock_bh(&sk->sk_callback_lock);
517 state = (__iscsi_target_sk_check_close(sk) ||
518 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
519 read_unlock_bh(&sk->sk_callback_lock);
520 }
521 return state;
522 }
523
iscsi_target_sk_check_flag(struct iscsi_conn * conn,unsigned int flag)524 static bool iscsi_target_sk_check_flag(struct iscsi_conn *conn, unsigned int flag)
525 {
526 bool state = false;
527
528 if (conn->sock) {
529 struct sock *sk = conn->sock->sk;
530
531 read_lock_bh(&sk->sk_callback_lock);
532 state = test_bit(flag, &conn->login_flags);
533 read_unlock_bh(&sk->sk_callback_lock);
534 }
535 return state;
536 }
537
iscsi_target_sk_check_and_clear(struct iscsi_conn * conn,unsigned int flag)538 static bool iscsi_target_sk_check_and_clear(struct iscsi_conn *conn, unsigned int flag)
539 {
540 bool state = false;
541
542 if (conn->sock) {
543 struct sock *sk = conn->sock->sk;
544
545 write_lock_bh(&sk->sk_callback_lock);
546 state = (__iscsi_target_sk_check_close(sk) ||
547 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
548 if (!state)
549 clear_bit(flag, &conn->login_flags);
550 write_unlock_bh(&sk->sk_callback_lock);
551 }
552 return state;
553 }
554
iscsi_target_login_drop(struct iscsi_conn * conn,struct iscsi_login * login)555 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
556 {
557 struct iscsi_np *np = login->np;
558 bool zero_tsih = login->zero_tsih;
559
560 iscsi_remove_failed_auth_entry(conn);
561 iscsi_target_nego_release(conn);
562 iscsi_target_login_sess_out(conn, np, zero_tsih, true);
563 }
564
iscsi_target_login_timeout(unsigned long data)565 static void iscsi_target_login_timeout(unsigned long data)
566 {
567 struct iscsi_conn *conn = (struct iscsi_conn *)data;
568
569 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
570
571 if (conn->login_kworker) {
572 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
573 conn->login_kworker->comm, conn->login_kworker->pid);
574 send_sig(SIGINT, conn->login_kworker, 1);
575 }
576 }
577
iscsi_target_do_login_rx(struct work_struct * work)578 static void iscsi_target_do_login_rx(struct work_struct *work)
579 {
580 struct iscsi_conn *conn = container_of(work,
581 struct iscsi_conn, login_work.work);
582 struct iscsi_login *login = conn->login;
583 struct iscsi_np *np = login->np;
584 struct iscsi_portal_group *tpg = conn->tpg;
585 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
586 struct timer_list login_timer;
587 int rc, zero_tsih = login->zero_tsih;
588 bool state;
589
590 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
591 conn, current->comm, current->pid);
592 /*
593 * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready()
594 * before initial PDU processing in iscsi_target_start_negotiation()
595 * has completed, go ahead and retry until it's cleared.
596 *
597 * Otherwise if the TCP connection drops while this is occuring,
598 * iscsi_target_start_negotiation() will detect the failure, call
599 * cancel_delayed_work_sync(&conn->login_work), and cleanup the
600 * remaining iscsi connection resources from iscsi_np process context.
601 */
602 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) {
603 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10));
604 return;
605 }
606
607 spin_lock(&tpg->tpg_state_lock);
608 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
609 spin_unlock(&tpg->tpg_state_lock);
610
611 if (!state) {
612 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
613 goto err;
614 }
615
616 if (iscsi_target_sk_check_close(conn)) {
617 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
618 goto err;
619 }
620
621 conn->login_kworker = current;
622 allow_signal(SIGINT);
623
624 init_timer(&login_timer);
625 login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
626 login_timer.data = (unsigned long)conn;
627 login_timer.function = iscsi_target_login_timeout;
628 add_timer(&login_timer);
629 pr_debug("Starting login_timer for %s/%d\n", current->comm, current->pid);
630
631 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
632 del_timer_sync(&login_timer);
633 flush_signals(current);
634 conn->login_kworker = NULL;
635
636 if (rc < 0)
637 goto err;
638
639 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
640 conn, current->comm, current->pid);
641
642 rc = iscsi_target_do_login(conn, login);
643 if (rc < 0) {
644 goto err;
645 } else if (!rc) {
646 if (iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_READ_ACTIVE))
647 goto err;
648 } else if (rc == 1) {
649 iscsi_target_nego_release(conn);
650 iscsi_post_login_handler(np, conn, zero_tsih);
651 iscsit_deaccess_np(np, tpg, tpg_np);
652 }
653 return;
654
655 err:
656 iscsi_target_restore_sock_callbacks(conn);
657 iscsi_target_login_drop(conn, login);
658 iscsit_deaccess_np(np, tpg, tpg_np);
659 }
660
iscsi_target_sk_state_change(struct sock * sk)661 static void iscsi_target_sk_state_change(struct sock *sk)
662 {
663 struct iscsi_conn *conn;
664 void (*orig_state_change)(struct sock *);
665 bool state;
666
667 pr_debug("Entering iscsi_target_sk_state_change\n");
668
669 write_lock_bh(&sk->sk_callback_lock);
670 conn = sk->sk_user_data;
671 if (!conn) {
672 write_unlock_bh(&sk->sk_callback_lock);
673 return;
674 }
675 orig_state_change = conn->orig_state_change;
676
677 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
678 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
679 conn);
680 write_unlock_bh(&sk->sk_callback_lock);
681 orig_state_change(sk);
682 return;
683 }
684 state = __iscsi_target_sk_check_close(sk);
685 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state);
686
687 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
688 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
689 " conn: %p\n", conn);
690 if (state)
691 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
692 write_unlock_bh(&sk->sk_callback_lock);
693 orig_state_change(sk);
694 return;
695 }
696 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
697 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
698 conn);
699 write_unlock_bh(&sk->sk_callback_lock);
700 orig_state_change(sk);
701 return;
702 }
703 /*
704 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED,
705 * but only queue conn->login_work -> iscsi_target_do_login_rx()
706 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared.
707 *
708 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close()
709 * will detect the dropped TCP connection from delayed workqueue context.
710 *
711 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial
712 * iscsi_target_start_negotiation() is running, iscsi_target_do_login()
713 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation()
714 * via iscsi_target_sk_check_and_clear() is responsible for detecting the
715 * dropped TCP connection in iscsi_np process context, and cleaning up
716 * the remaining iscsi connection resources.
717 */
718 if (state) {
719 pr_debug("iscsi_target_sk_state_change got failed state\n");
720 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
721 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
722 write_unlock_bh(&sk->sk_callback_lock);
723
724 orig_state_change(sk);
725
726 if (!state)
727 schedule_delayed_work(&conn->login_work, 0);
728 return;
729 }
730 write_unlock_bh(&sk->sk_callback_lock);
731
732 orig_state_change(sk);
733 }
734
735 /*
736 * NOTE: We check for existing sessions or connections AFTER the initiator
737 * has been successfully authenticated in order to protect against faked
738 * ISID/TSIH combinations.
739 */
iscsi_target_check_for_existing_instances(struct iscsi_conn * conn,struct iscsi_login * login)740 static int iscsi_target_check_for_existing_instances(
741 struct iscsi_conn *conn,
742 struct iscsi_login *login)
743 {
744 if (login->checked_for_existing)
745 return 0;
746
747 login->checked_for_existing = 1;
748
749 if (!login->tsih)
750 return iscsi_check_for_session_reinstatement(conn);
751 else
752 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
753 login->initial_exp_statsn);
754 }
755
iscsi_target_do_authentication(struct iscsi_conn * conn,struct iscsi_login * login)756 static int iscsi_target_do_authentication(
757 struct iscsi_conn *conn,
758 struct iscsi_login *login)
759 {
760 int authret;
761 u32 payload_length;
762 struct iscsi_param *param;
763 struct iscsi_login_req *login_req;
764 struct iscsi_login_rsp *login_rsp;
765
766 login_req = (struct iscsi_login_req *) login->req;
767 login_rsp = (struct iscsi_login_rsp *) login->rsp;
768 payload_length = ntoh24(login_req->dlength);
769
770 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
771 if (!param)
772 return -1;
773
774 authret = iscsi_handle_authentication(
775 conn,
776 login->req_buf,
777 login->rsp_buf,
778 payload_length,
779 &login->rsp_length,
780 param->value);
781 switch (authret) {
782 case 0:
783 pr_debug("Received OK response"
784 " from LIO Authentication, continuing.\n");
785 break;
786 case 1:
787 pr_debug("iSCSI security negotiation"
788 " completed successfully.\n");
789 login->auth_complete = 1;
790 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
791 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
792 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
793 ISCSI_FLAG_LOGIN_TRANSIT);
794 login->current_stage = 1;
795 }
796 return iscsi_target_check_for_existing_instances(
797 conn, login);
798 case 2:
799 pr_err("Security negotiation"
800 " failed.\n");
801 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
802 ISCSI_LOGIN_STATUS_AUTH_FAILED);
803 return -1;
804 default:
805 pr_err("Received unknown error %d from LIO"
806 " Authentication\n", authret);
807 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
808 ISCSI_LOGIN_STATUS_TARGET_ERROR);
809 return -1;
810 }
811
812 return 0;
813 }
814
iscsi_target_handle_csg_zero(struct iscsi_conn * conn,struct iscsi_login * login)815 static int iscsi_target_handle_csg_zero(
816 struct iscsi_conn *conn,
817 struct iscsi_login *login)
818 {
819 int ret;
820 u32 payload_length;
821 struct iscsi_param *param;
822 struct iscsi_login_req *login_req;
823 struct iscsi_login_rsp *login_rsp;
824
825 login_req = (struct iscsi_login_req *) login->req;
826 login_rsp = (struct iscsi_login_rsp *) login->rsp;
827 payload_length = ntoh24(login_req->dlength);
828
829 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
830 if (!param)
831 return -1;
832
833 ret = iscsi_decode_text_input(
834 PHASE_SECURITY|PHASE_DECLARATIVE,
835 SENDER_INITIATOR|SENDER_RECEIVER,
836 login->req_buf,
837 payload_length,
838 conn);
839 if (ret < 0)
840 return -1;
841
842 if (ret > 0) {
843 if (login->auth_complete) {
844 pr_err("Initiator has already been"
845 " successfully authenticated, but is still"
846 " sending %s keys.\n", param->value);
847 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
848 ISCSI_LOGIN_STATUS_INIT_ERR);
849 return -1;
850 }
851
852 goto do_auth;
853 } else if (!payload_length) {
854 pr_err("Initiator sent zero length security payload,"
855 " login failed\n");
856 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
857 ISCSI_LOGIN_STATUS_AUTH_FAILED);
858 return -1;
859 }
860
861 if (login->first_request)
862 if (iscsi_target_check_first_request(conn, login) < 0)
863 return -1;
864
865 ret = iscsi_encode_text_output(
866 PHASE_SECURITY|PHASE_DECLARATIVE,
867 SENDER_TARGET,
868 login->rsp_buf,
869 &login->rsp_length,
870 conn->param_list,
871 conn->tpg->tpg_attrib.login_keys_workaround);
872 if (ret < 0)
873 return -1;
874
875 if (!iscsi_check_negotiated_keys(conn->param_list)) {
876 if (conn->tpg->tpg_attrib.authentication &&
877 !strncmp(param->value, NONE, 4)) {
878 pr_err("Initiator sent AuthMethod=None but"
879 " Target is enforcing iSCSI Authentication,"
880 " login failed.\n");
881 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
882 ISCSI_LOGIN_STATUS_AUTH_FAILED);
883 return -1;
884 }
885
886 if (conn->tpg->tpg_attrib.authentication &&
887 !login->auth_complete)
888 return 0;
889
890 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
891 return 0;
892
893 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
894 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
895 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
896 ISCSI_FLAG_LOGIN_TRANSIT;
897 login->current_stage = 1;
898 }
899 }
900
901 return 0;
902 do_auth:
903 return iscsi_target_do_authentication(conn, login);
904 }
905
iscsi_target_handle_csg_one(struct iscsi_conn * conn,struct iscsi_login * login)906 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
907 {
908 int ret;
909 u32 payload_length;
910 struct iscsi_login_req *login_req;
911 struct iscsi_login_rsp *login_rsp;
912
913 login_req = (struct iscsi_login_req *) login->req;
914 login_rsp = (struct iscsi_login_rsp *) login->rsp;
915 payload_length = ntoh24(login_req->dlength);
916
917 ret = iscsi_decode_text_input(
918 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
919 SENDER_INITIATOR|SENDER_RECEIVER,
920 login->req_buf,
921 payload_length,
922 conn);
923 if (ret < 0) {
924 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
925 ISCSI_LOGIN_STATUS_INIT_ERR);
926 return -1;
927 }
928
929 if (login->first_request)
930 if (iscsi_target_check_first_request(conn, login) < 0)
931 return -1;
932
933 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
934 return -1;
935
936 ret = iscsi_encode_text_output(
937 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
938 SENDER_TARGET,
939 login->rsp_buf,
940 &login->rsp_length,
941 conn->param_list,
942 conn->tpg->tpg_attrib.login_keys_workaround);
943 if (ret < 0) {
944 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
945 ISCSI_LOGIN_STATUS_INIT_ERR);
946 return -1;
947 }
948
949 if (!login->auth_complete &&
950 conn->tpg->tpg_attrib.authentication) {
951 pr_err("Initiator is requesting CSG: 1, has not been"
952 " successfully authenticated, and the Target is"
953 " enforcing iSCSI Authentication, login failed.\n");
954 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
955 ISCSI_LOGIN_STATUS_AUTH_FAILED);
956 return -1;
957 }
958
959 if (!iscsi_check_negotiated_keys(conn->param_list))
960 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
961 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
962 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
963 ISCSI_FLAG_LOGIN_TRANSIT;
964
965 return 0;
966 }
967
iscsi_target_do_login(struct iscsi_conn * conn,struct iscsi_login * login)968 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
969 {
970 int pdu_count = 0;
971 struct iscsi_login_req *login_req;
972 struct iscsi_login_rsp *login_rsp;
973
974 login_req = (struct iscsi_login_req *) login->req;
975 login_rsp = (struct iscsi_login_rsp *) login->rsp;
976
977 while (1) {
978 if (++pdu_count > MAX_LOGIN_PDUS) {
979 pr_err("MAX_LOGIN_PDUS count reached.\n");
980 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
981 ISCSI_LOGIN_STATUS_TARGET_ERROR);
982 return -1;
983 }
984
985 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
986 case 0:
987 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
988 if (iscsi_target_handle_csg_zero(conn, login) < 0)
989 return -1;
990 break;
991 case 1:
992 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
993 if (iscsi_target_handle_csg_one(conn, login) < 0)
994 return -1;
995 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
996 /*
997 * Check to make sure the TCP connection has not
998 * dropped asynchronously while session reinstatement
999 * was occuring in this kthread context, before
1000 * transitioning to full feature phase operation.
1001 */
1002 if (iscsi_target_sk_check_close(conn))
1003 return -1;
1004
1005 login->tsih = conn->sess->tsih;
1006 login->login_complete = 1;
1007 iscsi_target_restore_sock_callbacks(conn);
1008 if (iscsi_target_do_tx_login_io(conn,
1009 login) < 0)
1010 return -1;
1011 return 1;
1012 }
1013 break;
1014 default:
1015 pr_err("Illegal CSG: %d received from"
1016 " Initiator, protocol error.\n",
1017 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
1018 break;
1019 }
1020
1021 if (iscsi_target_do_tx_login_io(conn, login) < 0)
1022 return -1;
1023
1024 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1025 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
1026 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
1027 }
1028 break;
1029 }
1030
1031 return 0;
1032 }
1033
iscsi_initiatorname_tolower(char * param_buf)1034 static void iscsi_initiatorname_tolower(
1035 char *param_buf)
1036 {
1037 char *c;
1038 u32 iqn_size = strlen(param_buf), i;
1039
1040 for (i = 0; i < iqn_size; i++) {
1041 c = ¶m_buf[i];
1042 if (!isupper(*c))
1043 continue;
1044
1045 *c = tolower(*c);
1046 }
1047 }
1048
1049 /*
1050 * Processes the first Login Request..
1051 */
iscsi_target_locate_portal(struct iscsi_np * np,struct iscsi_conn * conn,struct iscsi_login * login)1052 int iscsi_target_locate_portal(
1053 struct iscsi_np *np,
1054 struct iscsi_conn *conn,
1055 struct iscsi_login *login)
1056 {
1057 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1058 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1059 struct iscsi_session *sess = conn->sess;
1060 struct iscsi_tiqn *tiqn;
1061 struct iscsi_tpg_np *tpg_np = NULL;
1062 struct iscsi_login_req *login_req;
1063 struct se_node_acl *se_nacl;
1064 u32 payload_length, queue_depth = 0;
1065 int sessiontype = 0, ret = 0, tag_num, tag_size;
1066
1067 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1068 iscsi_target_set_sock_callbacks(conn);
1069
1070 login->np = np;
1071
1072 login_req = (struct iscsi_login_req *) login->req;
1073 payload_length = ntoh24(login_req->dlength);
1074
1075 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1076 if (!tmpbuf) {
1077 pr_err("Unable to allocate memory for tmpbuf.\n");
1078 return -1;
1079 }
1080
1081 memcpy(tmpbuf, login->req_buf, payload_length);
1082 tmpbuf[payload_length] = '\0';
1083 start = tmpbuf;
1084 end = (start + payload_length);
1085
1086 /*
1087 * Locate the initial keys expected from the Initiator node in
1088 * the first login request in order to progress with the login phase.
1089 */
1090 while (start < end) {
1091 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1092 ret = -1;
1093 goto out;
1094 }
1095
1096 if (!strncmp(key, "InitiatorName", 13))
1097 i_buf = value;
1098 else if (!strncmp(key, "SessionType", 11))
1099 s_buf = value;
1100 else if (!strncmp(key, "TargetName", 10))
1101 t_buf = value;
1102
1103 start += strlen(key) + strlen(value) + 2;
1104 }
1105 /*
1106 * See 5.3. Login Phase.
1107 */
1108 if (!i_buf) {
1109 pr_err("InitiatorName key not received"
1110 " in first login request.\n");
1111 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1112 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1113 ret = -1;
1114 goto out;
1115 }
1116 /*
1117 * Convert the incoming InitiatorName to lowercase following
1118 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1119 * are NOT case sensitive.
1120 */
1121 iscsi_initiatorname_tolower(i_buf);
1122
1123 if (!s_buf) {
1124 if (!login->leading_connection)
1125 goto get_target;
1126
1127 pr_err("SessionType key not received"
1128 " in first login request.\n");
1129 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1130 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1131 ret = -1;
1132 goto out;
1133 }
1134
1135 /*
1136 * Use default portal group for discovery sessions.
1137 */
1138 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1139 if (!sessiontype) {
1140 conn->tpg = iscsit_global->discovery_tpg;
1141 if (!login->leading_connection)
1142 goto get_target;
1143
1144 sess->sess_ops->SessionType = 1;
1145 /*
1146 * Setup crc32c modules from libcrypto
1147 */
1148 if (iscsi_login_setup_crypto(conn) < 0) {
1149 pr_err("iscsi_login_setup_crypto() failed\n");
1150 ret = -1;
1151 goto out;
1152 }
1153 /*
1154 * Serialize access across the discovery struct iscsi_portal_group to
1155 * process login attempt.
1156 */
1157 if (iscsit_access_np(np, conn->tpg) < 0) {
1158 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1159 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1160 ret = -1;
1161 goto out;
1162 }
1163 ret = 0;
1164 goto alloc_tags;
1165 }
1166
1167 get_target:
1168 if (!t_buf) {
1169 pr_err("TargetName key not received"
1170 " in first login request while"
1171 " SessionType=Normal.\n");
1172 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1173 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1174 ret = -1;
1175 goto out;
1176 }
1177
1178 /*
1179 * Locate Target IQN from Storage Node.
1180 */
1181 tiqn = iscsit_get_tiqn_for_login(t_buf);
1182 if (!tiqn) {
1183 pr_err("Unable to locate Target IQN: %s in"
1184 " Storage Node\n", t_buf);
1185 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1186 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1187 ret = -1;
1188 goto out;
1189 }
1190 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1191
1192 /*
1193 * Locate Target Portal Group from Storage Node.
1194 */
1195 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1196 if (!conn->tpg) {
1197 pr_err("Unable to locate Target Portal Group"
1198 " on %s\n", tiqn->tiqn);
1199 iscsit_put_tiqn_for_login(tiqn);
1200 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1201 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1202 ret = -1;
1203 goto out;
1204 }
1205 conn->tpg_np = tpg_np;
1206 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1207 /*
1208 * Setup crc32c modules from libcrypto
1209 */
1210 if (iscsi_login_setup_crypto(conn) < 0) {
1211 pr_err("iscsi_login_setup_crypto() failed\n");
1212 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1213 iscsit_put_tiqn_for_login(tiqn);
1214 conn->tpg = NULL;
1215 ret = -1;
1216 goto out;
1217 }
1218 /*
1219 * Serialize access across the struct iscsi_portal_group to
1220 * process login attempt.
1221 */
1222 if (iscsit_access_np(np, conn->tpg) < 0) {
1223 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1224 iscsit_put_tiqn_for_login(tiqn);
1225 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1226 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1227 conn->tpg = NULL;
1228 ret = -1;
1229 goto out;
1230 }
1231
1232 /*
1233 * conn->sess->node_acl will be set when the referenced
1234 * struct iscsi_session is located from received ISID+TSIH in
1235 * iscsi_login_non_zero_tsih_s2().
1236 */
1237 if (!login->leading_connection) {
1238 ret = 0;
1239 goto out;
1240 }
1241
1242 /*
1243 * This value is required in iscsi_login_zero_tsih_s2()
1244 */
1245 sess->sess_ops->SessionType = 0;
1246
1247 /*
1248 * Locate incoming Initiator IQN reference from Storage Node.
1249 */
1250 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1251 &conn->tpg->tpg_se_tpg, i_buf);
1252 if (!sess->se_sess->se_node_acl) {
1253 pr_err("iSCSI Initiator Node: %s is not authorized to"
1254 " access iSCSI target portal group: %hu.\n",
1255 i_buf, conn->tpg->tpgt);
1256 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1257 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1258 ret = -1;
1259 goto out;
1260 }
1261 se_nacl = sess->se_sess->se_node_acl;
1262 queue_depth = se_nacl->queue_depth;
1263 /*
1264 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1265 * depth for non immediate commands, plus extra tags for immediate
1266 * commands.
1267 *
1268 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1269 * in per-cpu-ida tag allocation logic + small queue_depth.
1270 */
1271 alloc_tags:
1272 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1273 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1274 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1275
1276 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1277 if (ret < 0) {
1278 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1279 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1280 ret = -1;
1281 }
1282 out:
1283 kfree(tmpbuf);
1284 return ret;
1285 }
1286
iscsi_target_start_negotiation(struct iscsi_login * login,struct iscsi_conn * conn)1287 int iscsi_target_start_negotiation(
1288 struct iscsi_login *login,
1289 struct iscsi_conn *conn)
1290 {
1291 int ret;
1292
1293 if (conn->sock) {
1294 struct sock *sk = conn->sock->sk;
1295
1296 write_lock_bh(&sk->sk_callback_lock);
1297 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1298 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
1299 write_unlock_bh(&sk->sk_callback_lock);
1300 }
1301 /*
1302 * If iscsi_target_do_login returns zero to signal more PDU
1303 * exchanges are required to complete the login, go ahead and
1304 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection
1305 * is still active.
1306 *
1307 * Otherwise if TCP connection dropped asynchronously, go ahead
1308 * and perform connection cleanup now.
1309 */
1310 ret = iscsi_target_do_login(conn, login);
1311 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
1312 ret = -1;
1313
1314 if (ret < 0) {
1315 cancel_delayed_work_sync(&conn->login_work);
1316 iscsi_target_restore_sock_callbacks(conn);
1317 iscsi_remove_failed_auth_entry(conn);
1318 }
1319 if (ret != 0)
1320 iscsi_target_nego_release(conn);
1321
1322 return ret;
1323 }
1324
iscsi_target_nego_release(struct iscsi_conn * conn)1325 void iscsi_target_nego_release(struct iscsi_conn *conn)
1326 {
1327 struct iscsi_login *login = conn->conn_login;
1328
1329 if (!login)
1330 return;
1331
1332 kfree(login->req_buf);
1333 kfree(login->rsp_buf);
1334 kfree(login);
1335
1336 conn->conn_login = NULL;
1337 }
1338