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 bool zero_tsih = login->zero_tsih;
558
559 iscsi_remove_failed_auth_entry(conn);
560 iscsi_target_nego_release(conn);
561 iscsi_target_login_sess_out(conn, zero_tsih, true);
562 }
563
564 struct conn_timeout {
565 struct timer_list timer;
566 struct iscsi_conn *conn;
567 };
568
iscsi_target_login_timeout(struct timer_list * t)569 static void iscsi_target_login_timeout(struct timer_list *t)
570 {
571 struct conn_timeout *timeout = from_timer(timeout, t, timer);
572 struct iscsi_conn *conn = timeout->conn;
573
574 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
575
576 if (conn->login_kworker) {
577 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
578 conn->login_kworker->comm, conn->login_kworker->pid);
579 send_sig(SIGINT, conn->login_kworker, 1);
580 }
581 }
582
iscsi_target_do_login_rx(struct work_struct * work)583 static void iscsi_target_do_login_rx(struct work_struct *work)
584 {
585 struct iscsi_conn *conn = container_of(work,
586 struct iscsi_conn, login_work.work);
587 struct iscsi_login *login = conn->login;
588 struct iscsi_np *np = login->np;
589 struct iscsi_portal_group *tpg = conn->tpg;
590 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
591 struct conn_timeout timeout;
592 int rc, zero_tsih = login->zero_tsih;
593 bool state;
594
595 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
596 conn, current->comm, current->pid);
597 /*
598 * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready()
599 * before initial PDU processing in iscsi_target_start_negotiation()
600 * has completed, go ahead and retry until it's cleared.
601 *
602 * Otherwise if the TCP connection drops while this is occuring,
603 * iscsi_target_start_negotiation() will detect the failure, call
604 * cancel_delayed_work_sync(&conn->login_work), and cleanup the
605 * remaining iscsi connection resources from iscsi_np process context.
606 */
607 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) {
608 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10));
609 return;
610 }
611
612 spin_lock(&tpg->tpg_state_lock);
613 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
614 spin_unlock(&tpg->tpg_state_lock);
615
616 if (!state) {
617 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
618 goto err;
619 }
620
621 if (iscsi_target_sk_check_close(conn)) {
622 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
623 goto err;
624 }
625
626 conn->login_kworker = current;
627 allow_signal(SIGINT);
628
629 timeout.conn = conn;
630 timer_setup_on_stack(&timeout.timer, iscsi_target_login_timeout, 0);
631 mod_timer(&timeout.timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
632 pr_debug("Starting login timer for %s/%d\n", current->comm, current->pid);
633
634 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
635 del_timer_sync(&timeout.timer);
636 destroy_timer_on_stack(&timeout.timer);
637 flush_signals(current);
638 conn->login_kworker = NULL;
639
640 if (rc < 0)
641 goto err;
642
643 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
644 conn, current->comm, current->pid);
645
646 rc = iscsi_target_do_login(conn, login);
647 if (rc < 0) {
648 goto err;
649 } else if (!rc) {
650 if (iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_READ_ACTIVE))
651 goto err;
652 } else if (rc == 1) {
653 iscsi_target_nego_release(conn);
654 iscsi_post_login_handler(np, conn, zero_tsih);
655 iscsit_deaccess_np(np, tpg, tpg_np);
656 }
657 return;
658
659 err:
660 iscsi_target_restore_sock_callbacks(conn);
661 iscsi_target_login_drop(conn, login);
662 iscsit_deaccess_np(np, tpg, tpg_np);
663 }
664
iscsi_target_sk_state_change(struct sock * sk)665 static void iscsi_target_sk_state_change(struct sock *sk)
666 {
667 struct iscsi_conn *conn;
668 void (*orig_state_change)(struct sock *);
669 bool state;
670
671 pr_debug("Entering iscsi_target_sk_state_change\n");
672
673 write_lock_bh(&sk->sk_callback_lock);
674 conn = sk->sk_user_data;
675 if (!conn) {
676 write_unlock_bh(&sk->sk_callback_lock);
677 return;
678 }
679 orig_state_change = conn->orig_state_change;
680
681 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
682 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
683 conn);
684 write_unlock_bh(&sk->sk_callback_lock);
685 orig_state_change(sk);
686 return;
687 }
688 state = __iscsi_target_sk_check_close(sk);
689 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state);
690
691 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
692 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
693 " conn: %p\n", conn);
694 if (state)
695 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
696 write_unlock_bh(&sk->sk_callback_lock);
697 orig_state_change(sk);
698 return;
699 }
700 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
701 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
702 conn);
703 write_unlock_bh(&sk->sk_callback_lock);
704 orig_state_change(sk);
705 return;
706 }
707 /*
708 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED,
709 * but only queue conn->login_work -> iscsi_target_do_login_rx()
710 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared.
711 *
712 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close()
713 * will detect the dropped TCP connection from delayed workqueue context.
714 *
715 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial
716 * iscsi_target_start_negotiation() is running, iscsi_target_do_login()
717 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation()
718 * via iscsi_target_sk_check_and_clear() is responsible for detecting the
719 * dropped TCP connection in iscsi_np process context, and cleaning up
720 * the remaining iscsi connection resources.
721 */
722 if (state) {
723 pr_debug("iscsi_target_sk_state_change got failed state\n");
724 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
725 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
726 write_unlock_bh(&sk->sk_callback_lock);
727
728 orig_state_change(sk);
729
730 if (!state)
731 schedule_delayed_work(&conn->login_work, 0);
732 return;
733 }
734 write_unlock_bh(&sk->sk_callback_lock);
735
736 orig_state_change(sk);
737 }
738
739 /*
740 * NOTE: We check for existing sessions or connections AFTER the initiator
741 * has been successfully authenticated in order to protect against faked
742 * ISID/TSIH combinations.
743 */
iscsi_target_check_for_existing_instances(struct iscsi_conn * conn,struct iscsi_login * login)744 static int iscsi_target_check_for_existing_instances(
745 struct iscsi_conn *conn,
746 struct iscsi_login *login)
747 {
748 if (login->checked_for_existing)
749 return 0;
750
751 login->checked_for_existing = 1;
752
753 if (!login->tsih)
754 return iscsi_check_for_session_reinstatement(conn);
755 else
756 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
757 login->initial_exp_statsn);
758 }
759
iscsi_target_do_authentication(struct iscsi_conn * conn,struct iscsi_login * login)760 static int iscsi_target_do_authentication(
761 struct iscsi_conn *conn,
762 struct iscsi_login *login)
763 {
764 int authret;
765 u32 payload_length;
766 struct iscsi_param *param;
767 struct iscsi_login_req *login_req;
768 struct iscsi_login_rsp *login_rsp;
769
770 login_req = (struct iscsi_login_req *) login->req;
771 login_rsp = (struct iscsi_login_rsp *) login->rsp;
772 payload_length = ntoh24(login_req->dlength);
773
774 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
775 if (!param)
776 return -1;
777
778 authret = iscsi_handle_authentication(
779 conn,
780 login->req_buf,
781 login->rsp_buf,
782 payload_length,
783 &login->rsp_length,
784 param->value);
785 switch (authret) {
786 case 0:
787 pr_debug("Received OK response"
788 " from LIO Authentication, continuing.\n");
789 break;
790 case 1:
791 pr_debug("iSCSI security negotiation"
792 " completed successfully.\n");
793 login->auth_complete = 1;
794 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
795 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
796 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
797 ISCSI_FLAG_LOGIN_TRANSIT);
798 login->current_stage = 1;
799 }
800 return iscsi_target_check_for_existing_instances(
801 conn, login);
802 case 2:
803 pr_err("Security negotiation"
804 " failed.\n");
805 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
806 ISCSI_LOGIN_STATUS_AUTH_FAILED);
807 return -1;
808 default:
809 pr_err("Received unknown error %d from LIO"
810 " Authentication\n", authret);
811 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
812 ISCSI_LOGIN_STATUS_TARGET_ERROR);
813 return -1;
814 }
815
816 return 0;
817 }
818
iscsi_target_handle_csg_zero(struct iscsi_conn * conn,struct iscsi_login * login)819 static int iscsi_target_handle_csg_zero(
820 struct iscsi_conn *conn,
821 struct iscsi_login *login)
822 {
823 int ret;
824 u32 payload_length;
825 struct iscsi_param *param;
826 struct iscsi_login_req *login_req;
827 struct iscsi_login_rsp *login_rsp;
828
829 login_req = (struct iscsi_login_req *) login->req;
830 login_rsp = (struct iscsi_login_rsp *) login->rsp;
831 payload_length = ntoh24(login_req->dlength);
832
833 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
834 if (!param)
835 return -1;
836
837 ret = iscsi_decode_text_input(
838 PHASE_SECURITY|PHASE_DECLARATIVE,
839 SENDER_INITIATOR|SENDER_RECEIVER,
840 login->req_buf,
841 payload_length,
842 conn);
843 if (ret < 0)
844 return -1;
845
846 if (ret > 0) {
847 if (login->auth_complete) {
848 pr_err("Initiator has already been"
849 " successfully authenticated, but is still"
850 " sending %s keys.\n", param->value);
851 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
852 ISCSI_LOGIN_STATUS_INIT_ERR);
853 return -1;
854 }
855
856 goto do_auth;
857 } else if (!payload_length) {
858 pr_err("Initiator sent zero length security payload,"
859 " login failed\n");
860 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
861 ISCSI_LOGIN_STATUS_AUTH_FAILED);
862 return -1;
863 }
864
865 if (login->first_request)
866 if (iscsi_target_check_first_request(conn, login) < 0)
867 return -1;
868
869 ret = iscsi_encode_text_output(
870 PHASE_SECURITY|PHASE_DECLARATIVE,
871 SENDER_TARGET,
872 login->rsp_buf,
873 &login->rsp_length,
874 conn->param_list,
875 conn->tpg->tpg_attrib.login_keys_workaround);
876 if (ret < 0)
877 return -1;
878
879 if (!iscsi_check_negotiated_keys(conn->param_list)) {
880 if (conn->tpg->tpg_attrib.authentication &&
881 !strncmp(param->value, NONE, 4)) {
882 pr_err("Initiator sent AuthMethod=None but"
883 " Target is enforcing iSCSI Authentication,"
884 " login failed.\n");
885 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
886 ISCSI_LOGIN_STATUS_AUTH_FAILED);
887 return -1;
888 }
889
890 if (conn->tpg->tpg_attrib.authentication &&
891 !login->auth_complete)
892 return 0;
893
894 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
895 return 0;
896
897 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
898 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
899 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
900 ISCSI_FLAG_LOGIN_TRANSIT;
901 login->current_stage = 1;
902 }
903 }
904
905 return 0;
906 do_auth:
907 return iscsi_target_do_authentication(conn, login);
908 }
909
iscsi_target_handle_csg_one(struct iscsi_conn * conn,struct iscsi_login * login)910 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
911 {
912 int ret;
913 u32 payload_length;
914 struct iscsi_login_req *login_req;
915 struct iscsi_login_rsp *login_rsp;
916
917 login_req = (struct iscsi_login_req *) login->req;
918 login_rsp = (struct iscsi_login_rsp *) login->rsp;
919 payload_length = ntoh24(login_req->dlength);
920
921 ret = iscsi_decode_text_input(
922 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
923 SENDER_INITIATOR|SENDER_RECEIVER,
924 login->req_buf,
925 payload_length,
926 conn);
927 if (ret < 0) {
928 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
929 ISCSI_LOGIN_STATUS_INIT_ERR);
930 return -1;
931 }
932
933 if (login->first_request)
934 if (iscsi_target_check_first_request(conn, login) < 0)
935 return -1;
936
937 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
938 return -1;
939
940 ret = iscsi_encode_text_output(
941 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
942 SENDER_TARGET,
943 login->rsp_buf,
944 &login->rsp_length,
945 conn->param_list,
946 conn->tpg->tpg_attrib.login_keys_workaround);
947 if (ret < 0) {
948 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
949 ISCSI_LOGIN_STATUS_INIT_ERR);
950 return -1;
951 }
952
953 if (!login->auth_complete &&
954 conn->tpg->tpg_attrib.authentication) {
955 pr_err("Initiator is requesting CSG: 1, has not been"
956 " successfully authenticated, and the Target is"
957 " enforcing iSCSI Authentication, login failed.\n");
958 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
959 ISCSI_LOGIN_STATUS_AUTH_FAILED);
960 return -1;
961 }
962
963 if (!iscsi_check_negotiated_keys(conn->param_list))
964 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
965 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
966 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
967 ISCSI_FLAG_LOGIN_TRANSIT;
968
969 return 0;
970 }
971
iscsi_target_do_login(struct iscsi_conn * conn,struct iscsi_login * login)972 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
973 {
974 int pdu_count = 0;
975 struct iscsi_login_req *login_req;
976 struct iscsi_login_rsp *login_rsp;
977
978 login_req = (struct iscsi_login_req *) login->req;
979 login_rsp = (struct iscsi_login_rsp *) login->rsp;
980
981 while (1) {
982 if (++pdu_count > MAX_LOGIN_PDUS) {
983 pr_err("MAX_LOGIN_PDUS count reached.\n");
984 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
985 ISCSI_LOGIN_STATUS_TARGET_ERROR);
986 return -1;
987 }
988
989 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
990 case 0:
991 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
992 if (iscsi_target_handle_csg_zero(conn, login) < 0)
993 return -1;
994 break;
995 case 1:
996 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
997 if (iscsi_target_handle_csg_one(conn, login) < 0)
998 return -1;
999 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1000 /*
1001 * Check to make sure the TCP connection has not
1002 * dropped asynchronously while session reinstatement
1003 * was occuring in this kthread context, before
1004 * transitioning to full feature phase operation.
1005 */
1006 if (iscsi_target_sk_check_close(conn))
1007 return -1;
1008
1009 login->tsih = conn->sess->tsih;
1010 login->login_complete = 1;
1011 iscsi_target_restore_sock_callbacks(conn);
1012 if (iscsi_target_do_tx_login_io(conn,
1013 login) < 0)
1014 return -1;
1015 return 1;
1016 }
1017 break;
1018 default:
1019 pr_err("Illegal CSG: %d received from"
1020 " Initiator, protocol error.\n",
1021 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
1022 break;
1023 }
1024
1025 if (iscsi_target_do_tx_login_io(conn, login) < 0)
1026 return -1;
1027
1028 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1029 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
1030 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
1031 }
1032 break;
1033 }
1034
1035 return 0;
1036 }
1037
iscsi_initiatorname_tolower(char * param_buf)1038 static void iscsi_initiatorname_tolower(
1039 char *param_buf)
1040 {
1041 char *c;
1042 u32 iqn_size = strlen(param_buf), i;
1043
1044 for (i = 0; i < iqn_size; i++) {
1045 c = ¶m_buf[i];
1046 if (!isupper(*c))
1047 continue;
1048
1049 *c = tolower(*c);
1050 }
1051 }
1052
1053 /*
1054 * Processes the first Login Request..
1055 */
iscsi_target_locate_portal(struct iscsi_np * np,struct iscsi_conn * conn,struct iscsi_login * login)1056 int iscsi_target_locate_portal(
1057 struct iscsi_np *np,
1058 struct iscsi_conn *conn,
1059 struct iscsi_login *login)
1060 {
1061 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1062 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1063 struct iscsi_session *sess = conn->sess;
1064 struct iscsi_tiqn *tiqn;
1065 struct iscsi_tpg_np *tpg_np = NULL;
1066 struct iscsi_login_req *login_req;
1067 struct se_node_acl *se_nacl;
1068 u32 payload_length, queue_depth = 0;
1069 int sessiontype = 0, ret = 0, tag_num, tag_size;
1070
1071 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1072 iscsi_target_set_sock_callbacks(conn);
1073
1074 login->np = np;
1075
1076 login_req = (struct iscsi_login_req *) login->req;
1077 payload_length = ntoh24(login_req->dlength);
1078
1079 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1080 if (!tmpbuf) {
1081 pr_err("Unable to allocate memory for tmpbuf.\n");
1082 return -1;
1083 }
1084
1085 memcpy(tmpbuf, login->req_buf, payload_length);
1086 tmpbuf[payload_length] = '\0';
1087 start = tmpbuf;
1088 end = (start + payload_length);
1089
1090 /*
1091 * Locate the initial keys expected from the Initiator node in
1092 * the first login request in order to progress with the login phase.
1093 */
1094 while (start < end) {
1095 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1096 ret = -1;
1097 goto out;
1098 }
1099
1100 if (!strncmp(key, "InitiatorName", 13))
1101 i_buf = value;
1102 else if (!strncmp(key, "SessionType", 11))
1103 s_buf = value;
1104 else if (!strncmp(key, "TargetName", 10))
1105 t_buf = value;
1106
1107 start += strlen(key) + strlen(value) + 2;
1108 }
1109 /*
1110 * See 5.3. Login Phase.
1111 */
1112 if (!i_buf) {
1113 pr_err("InitiatorName key not received"
1114 " in first login request.\n");
1115 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1116 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1117 ret = -1;
1118 goto out;
1119 }
1120 /*
1121 * Convert the incoming InitiatorName to lowercase following
1122 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1123 * are NOT case sensitive.
1124 */
1125 iscsi_initiatorname_tolower(i_buf);
1126
1127 if (!s_buf) {
1128 if (!login->leading_connection)
1129 goto get_target;
1130
1131 pr_err("SessionType key not received"
1132 " in first login request.\n");
1133 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1134 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1135 ret = -1;
1136 goto out;
1137 }
1138
1139 /*
1140 * Use default portal group for discovery sessions.
1141 */
1142 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1143 if (!sessiontype) {
1144 conn->tpg = iscsit_global->discovery_tpg;
1145 if (!login->leading_connection)
1146 goto get_target;
1147
1148 sess->sess_ops->SessionType = 1;
1149 /*
1150 * Setup crc32c modules from libcrypto
1151 */
1152 if (iscsi_login_setup_crypto(conn) < 0) {
1153 pr_err("iscsi_login_setup_crypto() failed\n");
1154 ret = -1;
1155 goto out;
1156 }
1157 /*
1158 * Serialize access across the discovery struct iscsi_portal_group to
1159 * process login attempt.
1160 */
1161 if (iscsit_access_np(np, conn->tpg) < 0) {
1162 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1163 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1164 ret = -1;
1165 goto out;
1166 }
1167 ret = 0;
1168 goto alloc_tags;
1169 }
1170
1171 get_target:
1172 if (!t_buf) {
1173 pr_err("TargetName key not received"
1174 " in first login request while"
1175 " SessionType=Normal.\n");
1176 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1177 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1178 ret = -1;
1179 goto out;
1180 }
1181
1182 /*
1183 * Locate Target IQN from Storage Node.
1184 */
1185 tiqn = iscsit_get_tiqn_for_login(t_buf);
1186 if (!tiqn) {
1187 pr_err("Unable to locate Target IQN: %s in"
1188 " Storage Node\n", t_buf);
1189 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1190 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1191 ret = -1;
1192 goto out;
1193 }
1194 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1195
1196 /*
1197 * Locate Target Portal Group from Storage Node.
1198 */
1199 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1200 if (!conn->tpg) {
1201 pr_err("Unable to locate Target Portal Group"
1202 " on %s\n", tiqn->tiqn);
1203 iscsit_put_tiqn_for_login(tiqn);
1204 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1205 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1206 ret = -1;
1207 goto out;
1208 }
1209 conn->tpg_np = tpg_np;
1210 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1211 /*
1212 * Setup crc32c modules from libcrypto
1213 */
1214 if (iscsi_login_setup_crypto(conn) < 0) {
1215 pr_err("iscsi_login_setup_crypto() failed\n");
1216 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1217 iscsit_put_tiqn_for_login(tiqn);
1218 conn->tpg = NULL;
1219 ret = -1;
1220 goto out;
1221 }
1222 /*
1223 * Serialize access across the struct iscsi_portal_group to
1224 * process login attempt.
1225 */
1226 if (iscsit_access_np(np, conn->tpg) < 0) {
1227 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1228 iscsit_put_tiqn_for_login(tiqn);
1229 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1230 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1231 conn->tpg = NULL;
1232 ret = -1;
1233 goto out;
1234 }
1235
1236 /*
1237 * conn->sess->node_acl will be set when the referenced
1238 * struct iscsi_session is located from received ISID+TSIH in
1239 * iscsi_login_non_zero_tsih_s2().
1240 */
1241 if (!login->leading_connection) {
1242 ret = 0;
1243 goto out;
1244 }
1245
1246 /*
1247 * This value is required in iscsi_login_zero_tsih_s2()
1248 */
1249 sess->sess_ops->SessionType = 0;
1250
1251 /*
1252 * Locate incoming Initiator IQN reference from Storage Node.
1253 */
1254 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1255 &conn->tpg->tpg_se_tpg, i_buf);
1256 if (!sess->se_sess->se_node_acl) {
1257 pr_err("iSCSI Initiator Node: %s is not authorized to"
1258 " access iSCSI target portal group: %hu.\n",
1259 i_buf, conn->tpg->tpgt);
1260 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1261 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1262 ret = -1;
1263 goto out;
1264 }
1265 se_nacl = sess->se_sess->se_node_acl;
1266 queue_depth = se_nacl->queue_depth;
1267 /*
1268 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1269 * depth for non immediate commands, plus extra tags for immediate
1270 * commands.
1271 *
1272 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1273 * in per-cpu-ida tag allocation logic + small queue_depth.
1274 */
1275 alloc_tags:
1276 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1277 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1278 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1279
1280 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1281 if (ret < 0) {
1282 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1283 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1284 ret = -1;
1285 }
1286 out:
1287 kfree(tmpbuf);
1288 return ret;
1289 }
1290
iscsi_target_start_negotiation(struct iscsi_login * login,struct iscsi_conn * conn)1291 int iscsi_target_start_negotiation(
1292 struct iscsi_login *login,
1293 struct iscsi_conn *conn)
1294 {
1295 int ret;
1296
1297 if (conn->sock) {
1298 struct sock *sk = conn->sock->sk;
1299
1300 write_lock_bh(&sk->sk_callback_lock);
1301 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1302 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
1303 write_unlock_bh(&sk->sk_callback_lock);
1304 }
1305 /*
1306 * If iscsi_target_do_login returns zero to signal more PDU
1307 * exchanges are required to complete the login, go ahead and
1308 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection
1309 * is still active.
1310 *
1311 * Otherwise if TCP connection dropped asynchronously, go ahead
1312 * and perform connection cleanup now.
1313 */
1314 ret = iscsi_target_do_login(conn, login);
1315 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
1316 ret = -1;
1317
1318 if (ret < 0) {
1319 cancel_delayed_work_sync(&conn->login_work);
1320 iscsi_target_restore_sock_callbacks(conn);
1321 iscsi_remove_failed_auth_entry(conn);
1322 }
1323 if (ret != 0)
1324 iscsi_target_nego_release(conn);
1325
1326 return ret;
1327 }
1328
iscsi_target_nego_release(struct iscsi_conn * conn)1329 void iscsi_target_nego_release(struct iscsi_conn *conn)
1330 {
1331 struct iscsi_login *login = conn->conn_login;
1332
1333 if (!login)
1334 return;
1335
1336 kfree(login->req_buf);
1337 kfree(login->rsp_buf);
1338 kfree(login);
1339
1340 conn->conn_login = NULL;
1341 }
1342