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 <scsi/iscsi_proto.h>
22 #include <target/target_core_base.h>
23 #include <target/target_core_fabric.h>
24 #include <target/iscsi/iscsi_transport.h>
25
26 #include "iscsi_target_core.h"
27 #include "iscsi_target_parameters.h"
28 #include "iscsi_target_login.h"
29 #include "iscsi_target_nego.h"
30 #include "iscsi_target_tpg.h"
31 #include "iscsi_target_util.h"
32 #include "iscsi_target.h"
33 #include "iscsi_target_auth.h"
34
35 #define MAX_LOGIN_PDUS 7
36 #define TEXT_LEN 4096
37
convert_null_to_semi(char * buf,int len)38 void convert_null_to_semi(char *buf, int len)
39 {
40 int i;
41
42 for (i = 0; i < len; i++)
43 if (buf[i] == '\0')
44 buf[i] = ';';
45 }
46
strlen_semi(char * buf)47 static int strlen_semi(char *buf)
48 {
49 int i = 0;
50
51 while (buf[i] != '\0') {
52 if (buf[i] == ';')
53 return i;
54 i++;
55 }
56
57 return -1;
58 }
59
extract_param(const char * in_buf,const char * pattern,unsigned int max_length,char * out_buf,unsigned char * type)60 int extract_param(
61 const char *in_buf,
62 const char *pattern,
63 unsigned int max_length,
64 char *out_buf,
65 unsigned char *type)
66 {
67 char *ptr;
68 int len;
69
70 if (!in_buf || !pattern || !out_buf || !type)
71 return -1;
72
73 ptr = strstr(in_buf, pattern);
74 if (!ptr)
75 return -1;
76
77 ptr = strstr(ptr, "=");
78 if (!ptr)
79 return -1;
80
81 ptr += 1;
82 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
83 ptr += 2; /* skip 0x */
84 *type = HEX;
85 } else
86 *type = DECIMAL;
87
88 len = strlen_semi(ptr);
89 if (len < 0)
90 return -1;
91
92 if (len >= max_length) {
93 pr_err("Length of input: %d exceeds max_length:"
94 " %d\n", len, max_length);
95 return -1;
96 }
97 memcpy(out_buf, ptr, len);
98 out_buf[len] = '\0';
99
100 return 0;
101 }
102
iscsi_handle_authentication(struct iscsi_conn * conn,char * in_buf,char * out_buf,int in_length,int * out_length,unsigned char * authtype)103 static u32 iscsi_handle_authentication(
104 struct iscsi_conn *conn,
105 char *in_buf,
106 char *out_buf,
107 int in_length,
108 int *out_length,
109 unsigned char *authtype)
110 {
111 struct iscsi_session *sess = conn->sess;
112 struct iscsi_node_auth *auth;
113 struct iscsi_node_acl *iscsi_nacl;
114 struct iscsi_portal_group *iscsi_tpg;
115 struct se_node_acl *se_nacl;
116
117 if (!sess->sess_ops->SessionType) {
118 /*
119 * For SessionType=Normal
120 */
121 se_nacl = conn->sess->se_sess->se_node_acl;
122 if (!se_nacl) {
123 pr_err("Unable to locate struct se_node_acl for"
124 " CHAP auth\n");
125 return -1;
126 }
127 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
128 se_node_acl);
129 if (!iscsi_nacl) {
130 pr_err("Unable to locate struct iscsi_node_acl for"
131 " CHAP auth\n");
132 return -1;
133 }
134
135 if (se_nacl->dynamic_node_acl) {
136 iscsi_tpg = container_of(se_nacl->se_tpg,
137 struct iscsi_portal_group, tpg_se_tpg);
138
139 auth = &iscsi_tpg->tpg_demo_auth;
140 } else {
141 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
142 se_node_acl);
143
144 auth = &iscsi_nacl->node_auth;
145 }
146 } else {
147 /*
148 * For SessionType=Discovery
149 */
150 auth = &iscsit_global->discovery_acl.node_auth;
151 }
152
153 if (strstr("CHAP", authtype))
154 strcpy(conn->sess->auth_type, "CHAP");
155 else
156 strcpy(conn->sess->auth_type, NONE);
157
158 if (strstr("None", authtype))
159 return 1;
160 #ifdef CANSRP
161 else if (strstr("SRP", authtype))
162 return srp_main_loop(conn, auth, in_buf, out_buf,
163 &in_length, out_length);
164 #endif
165 else if (strstr("CHAP", authtype))
166 return chap_main_loop(conn, auth, in_buf, out_buf,
167 &in_length, out_length);
168 else if (strstr("SPKM1", authtype))
169 return 2;
170 else if (strstr("SPKM2", authtype))
171 return 2;
172 else if (strstr("KRB5", authtype))
173 return 2;
174 else
175 return 2;
176 }
177
iscsi_remove_failed_auth_entry(struct iscsi_conn * conn)178 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
179 {
180 kfree(conn->auth_protocol);
181 }
182
iscsi_target_check_login_request(struct iscsi_conn * conn,struct iscsi_login * login)183 int iscsi_target_check_login_request(
184 struct iscsi_conn *conn,
185 struct iscsi_login *login)
186 {
187 int req_csg, req_nsg;
188 u32 payload_length;
189 struct iscsi_login_req *login_req;
190
191 login_req = (struct iscsi_login_req *) login->req;
192 payload_length = ntoh24(login_req->dlength);
193
194 switch (login_req->opcode & ISCSI_OPCODE_MASK) {
195 case ISCSI_OP_LOGIN:
196 break;
197 default:
198 pr_err("Received unknown opcode 0x%02x.\n",
199 login_req->opcode & ISCSI_OPCODE_MASK);
200 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
201 ISCSI_LOGIN_STATUS_INIT_ERR);
202 return -1;
203 }
204
205 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
206 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
207 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
208 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
209 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
210 ISCSI_LOGIN_STATUS_INIT_ERR);
211 return -1;
212 }
213
214 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
215 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
216
217 if (req_csg != login->current_stage) {
218 pr_err("Initiator unexpectedly changed login stage"
219 " from %d to %d, login failed.\n", login->current_stage,
220 req_csg);
221 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
222 ISCSI_LOGIN_STATUS_INIT_ERR);
223 return -1;
224 }
225
226 if ((req_nsg == 2) || (req_csg >= 2) ||
227 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
228 (req_nsg <= req_csg))) {
229 pr_err("Illegal login_req->flags Combination, CSG: %d,"
230 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
231 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
232 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
233 ISCSI_LOGIN_STATUS_INIT_ERR);
234 return -1;
235 }
236
237 if ((login_req->max_version != login->version_max) ||
238 (login_req->min_version != login->version_min)) {
239 pr_err("Login request changed Version Max/Nin"
240 " unexpectedly to 0x%02x/0x%02x, protocol error\n",
241 login_req->max_version, login_req->min_version);
242 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
243 ISCSI_LOGIN_STATUS_INIT_ERR);
244 return -1;
245 }
246
247 if (memcmp(login_req->isid, login->isid, 6) != 0) {
248 pr_err("Login request changed ISID unexpectedly,"
249 " protocol error.\n");
250 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
251 ISCSI_LOGIN_STATUS_INIT_ERR);
252 return -1;
253 }
254
255 if (login_req->itt != login->init_task_tag) {
256 pr_err("Login request changed ITT unexpectedly to"
257 " 0x%08x, protocol error.\n", login_req->itt);
258 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
259 ISCSI_LOGIN_STATUS_INIT_ERR);
260 return -1;
261 }
262
263 if (payload_length > MAX_KEY_VALUE_PAIRS) {
264 pr_err("Login request payload exceeds default"
265 " MaxRecvDataSegmentLength: %u, protocol error.\n",
266 MAX_KEY_VALUE_PAIRS);
267 return -1;
268 }
269
270 return 0;
271 }
272
iscsi_target_check_first_request(struct iscsi_conn * conn,struct iscsi_login * login)273 static int iscsi_target_check_first_request(
274 struct iscsi_conn *conn,
275 struct iscsi_login *login)
276 {
277 struct iscsi_param *param = NULL;
278 struct se_node_acl *se_nacl;
279
280 login->first_request = 0;
281
282 list_for_each_entry(param, &conn->param_list->param_list, p_list) {
283 if (!strncmp(param->name, SESSIONTYPE, 11)) {
284 if (!IS_PSTATE_ACCEPTOR(param)) {
285 pr_err("SessionType key not received"
286 " in first login request.\n");
287 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
288 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
289 return -1;
290 }
291 if (!strncmp(param->value, DISCOVERY, 9))
292 return 0;
293 }
294
295 if (!strncmp(param->name, INITIATORNAME, 13)) {
296 if (!IS_PSTATE_ACCEPTOR(param)) {
297 if (!login->leading_connection)
298 continue;
299
300 pr_err("InitiatorName key not received"
301 " in first login request.\n");
302 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
303 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
304 return -1;
305 }
306
307 /*
308 * For non-leading connections, double check that the
309 * received InitiatorName matches the existing session's
310 * struct iscsi_node_acl.
311 */
312 if (!login->leading_connection) {
313 se_nacl = conn->sess->se_sess->se_node_acl;
314 if (!se_nacl) {
315 pr_err("Unable to locate"
316 " struct se_node_acl\n");
317 iscsit_tx_login_rsp(conn,
318 ISCSI_STATUS_CLS_INITIATOR_ERR,
319 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
320 return -1;
321 }
322
323 if (strcmp(param->value,
324 se_nacl->initiatorname)) {
325 pr_err("Incorrect"
326 " InitiatorName: %s for this"
327 " iSCSI Initiator Node.\n",
328 param->value);
329 iscsit_tx_login_rsp(conn,
330 ISCSI_STATUS_CLS_INITIATOR_ERR,
331 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
332 return -1;
333 }
334 }
335 }
336 }
337
338 return 0;
339 }
340
iscsi_target_do_tx_login_io(struct iscsi_conn * conn,struct iscsi_login * login)341 static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
342 {
343 u32 padding = 0;
344 struct iscsi_session *sess = conn->sess;
345 struct iscsi_login_rsp *login_rsp;
346
347 login_rsp = (struct iscsi_login_rsp *) login->rsp;
348
349 login_rsp->opcode = ISCSI_OP_LOGIN_RSP;
350 hton24(login_rsp->dlength, login->rsp_length);
351 memcpy(login_rsp->isid, login->isid, 6);
352 login_rsp->tsih = cpu_to_be16(login->tsih);
353 login_rsp->itt = login->init_task_tag;
354 login_rsp->statsn = cpu_to_be32(conn->stat_sn++);
355 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
356 login_rsp->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
357
358 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
359 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
360 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
361 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
362 ntohl(login_rsp->statsn), login->rsp_length);
363
364 padding = ((-login->rsp_length) & 3);
365 /*
366 * Before sending the last login response containing the transition
367 * bit for full-feature-phase, go ahead and start up TX/RX threads
368 * now to avoid potential resource allocation failures after the
369 * final login response has been sent.
370 */
371 if (login->login_complete) {
372 int rc = iscsit_start_kthreads(conn);
373 if (rc) {
374 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
375 ISCSI_LOGIN_STATUS_NO_RESOURCES);
376 return -1;
377 }
378 }
379
380 if (conn->conn_transport->iscsit_put_login_tx(conn, login,
381 login->rsp_length + padding) < 0)
382 goto err;
383
384 login->rsp_length = 0;
385 mutex_lock(&sess->cmdsn_mutex);
386 login_rsp->exp_cmdsn = cpu_to_be32(sess->exp_cmd_sn);
387 login_rsp->max_cmdsn = cpu_to_be32(sess->max_cmd_sn);
388 mutex_unlock(&sess->cmdsn_mutex);
389
390 return 0;
391
392 err:
393 if (login->login_complete) {
394 if (conn->rx_thread && conn->rx_thread_active) {
395 send_sig(SIGINT, conn->rx_thread, 1);
396 complete(&conn->rx_login_comp);
397 kthread_stop(conn->rx_thread);
398 }
399 if (conn->tx_thread && conn->tx_thread_active) {
400 send_sig(SIGINT, conn->tx_thread, 1);
401 kthread_stop(conn->tx_thread);
402 }
403 spin_lock(&iscsit_global->ts_bitmap_lock);
404 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
405 get_order(1));
406 spin_unlock(&iscsit_global->ts_bitmap_lock);
407 }
408 return -1;
409 }
410
iscsi_target_sk_data_ready(struct sock * sk)411 static void iscsi_target_sk_data_ready(struct sock *sk)
412 {
413 struct iscsi_conn *conn = sk->sk_user_data;
414 bool rc;
415
416 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
417
418 write_lock_bh(&sk->sk_callback_lock);
419 if (!sk->sk_user_data) {
420 write_unlock_bh(&sk->sk_callback_lock);
421 return;
422 }
423 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
424 write_unlock_bh(&sk->sk_callback_lock);
425 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
426 return;
427 }
428 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
429 write_unlock_bh(&sk->sk_callback_lock);
430 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
431 return;
432 }
433 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
434 write_unlock_bh(&sk->sk_callback_lock);
435 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
436 return;
437 }
438
439 rc = schedule_delayed_work(&conn->login_work, 0);
440 if (!rc) {
441 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
442 " got false\n");
443 }
444 write_unlock_bh(&sk->sk_callback_lock);
445 }
446
447 static void iscsi_target_sk_state_change(struct sock *);
448
iscsi_target_set_sock_callbacks(struct iscsi_conn * conn)449 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
450 {
451 struct sock *sk;
452
453 if (!conn->sock)
454 return;
455
456 sk = conn->sock->sk;
457 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
458
459 write_lock_bh(&sk->sk_callback_lock);
460 sk->sk_user_data = conn;
461 conn->orig_data_ready = sk->sk_data_ready;
462 conn->orig_state_change = sk->sk_state_change;
463 sk->sk_data_ready = iscsi_target_sk_data_ready;
464 sk->sk_state_change = iscsi_target_sk_state_change;
465 write_unlock_bh(&sk->sk_callback_lock);
466
467 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
468 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
469 }
470
iscsi_target_restore_sock_callbacks(struct iscsi_conn * conn)471 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
472 {
473 struct sock *sk;
474
475 if (!conn->sock)
476 return;
477
478 sk = conn->sock->sk;
479 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
480
481 write_lock_bh(&sk->sk_callback_lock);
482 if (!sk->sk_user_data) {
483 write_unlock_bh(&sk->sk_callback_lock);
484 return;
485 }
486 sk->sk_user_data = NULL;
487 sk->sk_data_ready = conn->orig_data_ready;
488 sk->sk_state_change = conn->orig_state_change;
489 write_unlock_bh(&sk->sk_callback_lock);
490
491 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
492 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
493 }
494
495 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
496
__iscsi_target_sk_check_close(struct sock * sk)497 static bool __iscsi_target_sk_check_close(struct sock *sk)
498 {
499 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
500 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE,"
501 "returning FALSE\n");
502 return true;
503 }
504 return false;
505 }
506
iscsi_target_sk_check_close(struct iscsi_conn * conn)507 static bool iscsi_target_sk_check_close(struct iscsi_conn *conn)
508 {
509 bool state = false;
510
511 if (conn->sock) {
512 struct sock *sk = conn->sock->sk;
513
514 read_lock_bh(&sk->sk_callback_lock);
515 state = (__iscsi_target_sk_check_close(sk) ||
516 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
517 read_unlock_bh(&sk->sk_callback_lock);
518 }
519 return state;
520 }
521
iscsi_target_sk_check_flag(struct iscsi_conn * conn,unsigned int flag)522 static bool iscsi_target_sk_check_flag(struct iscsi_conn *conn, unsigned int flag)
523 {
524 bool state = false;
525
526 if (conn->sock) {
527 struct sock *sk = conn->sock->sk;
528
529 read_lock_bh(&sk->sk_callback_lock);
530 state = test_bit(flag, &conn->login_flags);
531 read_unlock_bh(&sk->sk_callback_lock);
532 }
533 return state;
534 }
535
iscsi_target_sk_check_and_clear(struct iscsi_conn * conn,unsigned int flag)536 static bool iscsi_target_sk_check_and_clear(struct iscsi_conn *conn, unsigned int flag)
537 {
538 bool state = false;
539
540 if (conn->sock) {
541 struct sock *sk = conn->sock->sk;
542
543 write_lock_bh(&sk->sk_callback_lock);
544 state = (__iscsi_target_sk_check_close(sk) ||
545 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
546 if (!state)
547 clear_bit(flag, &conn->login_flags);
548 write_unlock_bh(&sk->sk_callback_lock);
549 }
550 return state;
551 }
552
iscsi_target_login_drop(struct iscsi_conn * conn,struct iscsi_login * login)553 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
554 {
555 struct iscsi_np *np = login->np;
556 bool zero_tsih = login->zero_tsih;
557
558 iscsi_remove_failed_auth_entry(conn);
559 iscsi_target_nego_release(conn);
560 iscsi_target_login_sess_out(conn, np, zero_tsih, true);
561 }
562
iscsi_target_login_timeout(unsigned long data)563 static void iscsi_target_login_timeout(unsigned long data)
564 {
565 struct iscsi_conn *conn = (struct iscsi_conn *)data;
566
567 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
568
569 if (conn->login_kworker) {
570 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
571 conn->login_kworker->comm, conn->login_kworker->pid);
572 send_sig(SIGINT, conn->login_kworker, 1);
573 }
574 }
575
iscsi_target_do_login_rx(struct work_struct * work)576 static void iscsi_target_do_login_rx(struct work_struct *work)
577 {
578 struct iscsi_conn *conn = container_of(work,
579 struct iscsi_conn, login_work.work);
580 struct iscsi_login *login = conn->login;
581 struct iscsi_np *np = login->np;
582 struct iscsi_portal_group *tpg = conn->tpg;
583 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
584 struct timer_list login_timer;
585 int rc, zero_tsih = login->zero_tsih;
586 bool state;
587
588 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
589 conn, current->comm, current->pid);
590 /*
591 * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready()
592 * before initial PDU processing in iscsi_target_start_negotiation()
593 * has completed, go ahead and retry until it's cleared.
594 *
595 * Otherwise if the TCP connection drops while this is occuring,
596 * iscsi_target_start_negotiation() will detect the failure, call
597 * cancel_delayed_work_sync(&conn->login_work), and cleanup the
598 * remaining iscsi connection resources from iscsi_np process context.
599 */
600 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) {
601 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10));
602 return;
603 }
604
605 spin_lock(&tpg->tpg_state_lock);
606 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
607 spin_unlock(&tpg->tpg_state_lock);
608
609 if (!state) {
610 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
611 goto err;
612 }
613
614 if (iscsi_target_sk_check_close(conn)) {
615 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
616 goto err;
617 }
618
619 conn->login_kworker = current;
620 allow_signal(SIGINT);
621
622 init_timer(&login_timer);
623 login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
624 login_timer.data = (unsigned long)conn;
625 login_timer.function = iscsi_target_login_timeout;
626 add_timer(&login_timer);
627 pr_debug("Starting login_timer for %s/%d\n", current->comm, current->pid);
628
629 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
630 del_timer_sync(&login_timer);
631 flush_signals(current);
632 conn->login_kworker = NULL;
633
634 if (rc < 0)
635 goto err;
636
637 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
638 conn, current->comm, current->pid);
639
640 rc = iscsi_target_do_login(conn, login);
641 if (rc < 0) {
642 goto err;
643 } else if (!rc) {
644 if (iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_READ_ACTIVE))
645 goto err;
646 } else if (rc == 1) {
647 iscsi_target_nego_release(conn);
648 iscsi_post_login_handler(np, conn, zero_tsih);
649 iscsit_deaccess_np(np, tpg, tpg_np);
650 }
651 return;
652
653 err:
654 iscsi_target_restore_sock_callbacks(conn);
655 iscsi_target_login_drop(conn, login);
656 iscsit_deaccess_np(np, tpg, tpg_np);
657 }
658
iscsi_target_do_cleanup(struct work_struct * work)659 static void iscsi_target_do_cleanup(struct work_struct *work)
660 {
661 struct iscsi_conn *conn = container_of(work,
662 struct iscsi_conn, login_cleanup_work.work);
663 struct sock *sk = conn->sock->sk;
664 struct iscsi_login *login = conn->login;
665 struct iscsi_np *np = login->np;
666 struct iscsi_portal_group *tpg = conn->tpg;
667 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
668
669 pr_debug("Entering iscsi_target_do_cleanup\n");
670
671 cancel_delayed_work_sync(&conn->login_work);
672 conn->orig_state_change(sk);
673
674 iscsi_target_restore_sock_callbacks(conn);
675 iscsi_target_login_drop(conn, login);
676 iscsit_deaccess_np(np, tpg, tpg_np);
677
678 pr_debug("iscsi_target_do_cleanup done()\n");
679 }
680
iscsi_target_sk_state_change(struct sock * sk)681 static void iscsi_target_sk_state_change(struct sock *sk)
682 {
683 struct iscsi_conn *conn;
684 void (*orig_state_change)(struct sock *);
685 bool state;
686
687 pr_debug("Entering iscsi_target_sk_state_change\n");
688
689 write_lock_bh(&sk->sk_callback_lock);
690 conn = sk->sk_user_data;
691 if (!conn) {
692 write_unlock_bh(&sk->sk_callback_lock);
693 return;
694 }
695 orig_state_change = conn->orig_state_change;
696
697 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
698 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
699 conn);
700 write_unlock_bh(&sk->sk_callback_lock);
701 orig_state_change(sk);
702 return;
703 }
704 state = __iscsi_target_sk_check_close(sk);
705 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state);
706
707 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
708 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
709 " conn: %p\n", conn);
710 if (state)
711 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
712 write_unlock_bh(&sk->sk_callback_lock);
713 orig_state_change(sk);
714 return;
715 }
716 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
717 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
718 conn);
719 write_unlock_bh(&sk->sk_callback_lock);
720 orig_state_change(sk);
721 return;
722 }
723 /*
724 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED,
725 * but only queue conn->login_work -> iscsi_target_do_login_rx()
726 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared.
727 *
728 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close()
729 * will detect the dropped TCP connection from delayed workqueue context.
730 *
731 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial
732 * iscsi_target_start_negotiation() is running, iscsi_target_do_login()
733 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation()
734 * via iscsi_target_sk_check_and_clear() is responsible for detecting the
735 * dropped TCP connection in iscsi_np process context, and cleaning up
736 * the remaining iscsi connection resources.
737 */
738 if (state) {
739 pr_debug("iscsi_target_sk_state_change got failed state\n");
740 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
741 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
742 write_unlock_bh(&sk->sk_callback_lock);
743
744 orig_state_change(sk);
745
746 if (!state)
747 schedule_delayed_work(&conn->login_work, 0);
748 return;
749 }
750 write_unlock_bh(&sk->sk_callback_lock);
751
752 orig_state_change(sk);
753 }
754
755 /*
756 * NOTE: We check for existing sessions or connections AFTER the initiator
757 * has been successfully authenticated in order to protect against faked
758 * ISID/TSIH combinations.
759 */
iscsi_target_check_for_existing_instances(struct iscsi_conn * conn,struct iscsi_login * login)760 static int iscsi_target_check_for_existing_instances(
761 struct iscsi_conn *conn,
762 struct iscsi_login *login)
763 {
764 if (login->checked_for_existing)
765 return 0;
766
767 login->checked_for_existing = 1;
768
769 if (!login->tsih)
770 return iscsi_check_for_session_reinstatement(conn);
771 else
772 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
773 login->initial_exp_statsn);
774 }
775
iscsi_target_do_authentication(struct iscsi_conn * conn,struct iscsi_login * login)776 static int iscsi_target_do_authentication(
777 struct iscsi_conn *conn,
778 struct iscsi_login *login)
779 {
780 int authret;
781 u32 payload_length;
782 struct iscsi_param *param;
783 struct iscsi_login_req *login_req;
784 struct iscsi_login_rsp *login_rsp;
785
786 login_req = (struct iscsi_login_req *) login->req;
787 login_rsp = (struct iscsi_login_rsp *) login->rsp;
788 payload_length = ntoh24(login_req->dlength);
789
790 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
791 if (!param)
792 return -1;
793
794 authret = iscsi_handle_authentication(
795 conn,
796 login->req_buf,
797 login->rsp_buf,
798 payload_length,
799 &login->rsp_length,
800 param->value);
801 switch (authret) {
802 case 0:
803 pr_debug("Received OK response"
804 " from LIO Authentication, continuing.\n");
805 break;
806 case 1:
807 pr_debug("iSCSI security negotiation"
808 " completed successfully.\n");
809 login->auth_complete = 1;
810 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
811 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
812 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
813 ISCSI_FLAG_LOGIN_TRANSIT);
814 login->current_stage = 1;
815 }
816 return iscsi_target_check_for_existing_instances(
817 conn, login);
818 case 2:
819 pr_err("Security negotiation"
820 " failed.\n");
821 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
822 ISCSI_LOGIN_STATUS_AUTH_FAILED);
823 return -1;
824 default:
825 pr_err("Received unknown error %d from LIO"
826 " Authentication\n", authret);
827 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
828 ISCSI_LOGIN_STATUS_TARGET_ERROR);
829 return -1;
830 }
831
832 return 0;
833 }
834
iscsi_target_handle_csg_zero(struct iscsi_conn * conn,struct iscsi_login * login)835 static int iscsi_target_handle_csg_zero(
836 struct iscsi_conn *conn,
837 struct iscsi_login *login)
838 {
839 int ret;
840 u32 payload_length;
841 struct iscsi_param *param;
842 struct iscsi_login_req *login_req;
843 struct iscsi_login_rsp *login_rsp;
844
845 login_req = (struct iscsi_login_req *) login->req;
846 login_rsp = (struct iscsi_login_rsp *) login->rsp;
847 payload_length = ntoh24(login_req->dlength);
848
849 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
850 if (!param)
851 return -1;
852
853 ret = iscsi_decode_text_input(
854 PHASE_SECURITY|PHASE_DECLARATIVE,
855 SENDER_INITIATOR|SENDER_RECEIVER,
856 login->req_buf,
857 payload_length,
858 conn);
859 if (ret < 0)
860 return -1;
861
862 if (ret > 0) {
863 if (login->auth_complete) {
864 pr_err("Initiator has already been"
865 " successfully authenticated, but is still"
866 " sending %s keys.\n", param->value);
867 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
868 ISCSI_LOGIN_STATUS_INIT_ERR);
869 return -1;
870 }
871
872 goto do_auth;
873 } else if (!payload_length) {
874 pr_err("Initiator sent zero length security payload,"
875 " login failed\n");
876 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
877 ISCSI_LOGIN_STATUS_AUTH_FAILED);
878 return -1;
879 }
880
881 if (login->first_request)
882 if (iscsi_target_check_first_request(conn, login) < 0)
883 return -1;
884
885 ret = iscsi_encode_text_output(
886 PHASE_SECURITY|PHASE_DECLARATIVE,
887 SENDER_TARGET,
888 login->rsp_buf,
889 &login->rsp_length,
890 conn->param_list);
891 if (ret < 0)
892 return -1;
893
894 if (!iscsi_check_negotiated_keys(conn->param_list)) {
895 if (conn->tpg->tpg_attrib.authentication &&
896 !strncmp(param->value, NONE, 4)) {
897 pr_err("Initiator sent AuthMethod=None but"
898 " Target is enforcing iSCSI Authentication,"
899 " login failed.\n");
900 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
901 ISCSI_LOGIN_STATUS_AUTH_FAILED);
902 return -1;
903 }
904
905 if (conn->tpg->tpg_attrib.authentication &&
906 !login->auth_complete)
907 return 0;
908
909 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
910 return 0;
911
912 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
913 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
914 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
915 ISCSI_FLAG_LOGIN_TRANSIT;
916 login->current_stage = 1;
917 }
918 }
919
920 return 0;
921 do_auth:
922 return iscsi_target_do_authentication(conn, login);
923 }
924
iscsi_target_handle_csg_one(struct iscsi_conn * conn,struct iscsi_login * login)925 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
926 {
927 int ret;
928 u32 payload_length;
929 struct iscsi_login_req *login_req;
930 struct iscsi_login_rsp *login_rsp;
931
932 login_req = (struct iscsi_login_req *) login->req;
933 login_rsp = (struct iscsi_login_rsp *) login->rsp;
934 payload_length = ntoh24(login_req->dlength);
935
936 ret = iscsi_decode_text_input(
937 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
938 SENDER_INITIATOR|SENDER_RECEIVER,
939 login->req_buf,
940 payload_length,
941 conn);
942 if (ret < 0) {
943 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
944 ISCSI_LOGIN_STATUS_INIT_ERR);
945 return -1;
946 }
947
948 if (login->first_request)
949 if (iscsi_target_check_first_request(conn, login) < 0)
950 return -1;
951
952 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
953 return -1;
954
955 ret = iscsi_encode_text_output(
956 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
957 SENDER_TARGET,
958 login->rsp_buf,
959 &login->rsp_length,
960 conn->param_list);
961 if (ret < 0) {
962 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
963 ISCSI_LOGIN_STATUS_INIT_ERR);
964 return -1;
965 }
966
967 if (!login->auth_complete &&
968 conn->tpg->tpg_attrib.authentication) {
969 pr_err("Initiator is requesting CSG: 1, has not been"
970 " successfully authenticated, and the Target is"
971 " enforcing iSCSI Authentication, login failed.\n");
972 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
973 ISCSI_LOGIN_STATUS_AUTH_FAILED);
974 return -1;
975 }
976
977 if (!iscsi_check_negotiated_keys(conn->param_list))
978 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
979 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
980 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
981 ISCSI_FLAG_LOGIN_TRANSIT;
982
983 return 0;
984 }
985
iscsi_target_do_login(struct iscsi_conn * conn,struct iscsi_login * login)986 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
987 {
988 int pdu_count = 0;
989 struct iscsi_login_req *login_req;
990 struct iscsi_login_rsp *login_rsp;
991
992 login_req = (struct iscsi_login_req *) login->req;
993 login_rsp = (struct iscsi_login_rsp *) login->rsp;
994
995 while (1) {
996 if (++pdu_count > MAX_LOGIN_PDUS) {
997 pr_err("MAX_LOGIN_PDUS count reached.\n");
998 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
999 ISCSI_LOGIN_STATUS_TARGET_ERROR);
1000 return -1;
1001 }
1002
1003 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
1004 case 0:
1005 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
1006 if (iscsi_target_handle_csg_zero(conn, login) < 0)
1007 return -1;
1008 break;
1009 case 1:
1010 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
1011 if (iscsi_target_handle_csg_one(conn, login) < 0)
1012 return -1;
1013 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1014 /*
1015 * Check to make sure the TCP connection has not
1016 * dropped asynchronously while session reinstatement
1017 * was occuring in this kthread context, before
1018 * transitioning to full feature phase operation.
1019 */
1020 if (iscsi_target_sk_check_close(conn))
1021 return -1;
1022
1023 login->tsih = conn->sess->tsih;
1024 login->login_complete = 1;
1025 iscsi_target_restore_sock_callbacks(conn);
1026 if (iscsi_target_do_tx_login_io(conn,
1027 login) < 0)
1028 return -1;
1029 return 1;
1030 }
1031 break;
1032 default:
1033 pr_err("Illegal CSG: %d received from"
1034 " Initiator, protocol error.\n",
1035 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
1036 break;
1037 }
1038
1039 if (iscsi_target_do_tx_login_io(conn, login) < 0)
1040 return -1;
1041
1042 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1043 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
1044 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
1045 }
1046 break;
1047 }
1048
1049 return 0;
1050 }
1051
iscsi_initiatorname_tolower(char * param_buf)1052 static void iscsi_initiatorname_tolower(
1053 char *param_buf)
1054 {
1055 char *c;
1056 u32 iqn_size = strlen(param_buf), i;
1057
1058 for (i = 0; i < iqn_size; i++) {
1059 c = ¶m_buf[i];
1060 if (!isupper(*c))
1061 continue;
1062
1063 *c = tolower(*c);
1064 }
1065 }
1066
1067 /*
1068 * Processes the first Login Request..
1069 */
iscsi_target_locate_portal(struct iscsi_np * np,struct iscsi_conn * conn,struct iscsi_login * login)1070 int iscsi_target_locate_portal(
1071 struct iscsi_np *np,
1072 struct iscsi_conn *conn,
1073 struct iscsi_login *login)
1074 {
1075 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1076 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1077 struct iscsi_session *sess = conn->sess;
1078 struct iscsi_tiqn *tiqn;
1079 struct iscsi_tpg_np *tpg_np = NULL;
1080 struct iscsi_login_req *login_req;
1081 struct se_node_acl *se_nacl;
1082 u32 payload_length, queue_depth = 0;
1083 int sessiontype = 0, ret = 0, tag_num, tag_size;
1084
1085 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1086 INIT_DELAYED_WORK(&conn->login_cleanup_work, iscsi_target_do_cleanup);
1087 iscsi_target_set_sock_callbacks(conn);
1088
1089 login->np = np;
1090
1091 login_req = (struct iscsi_login_req *) login->req;
1092 payload_length = ntoh24(login_req->dlength);
1093
1094 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1095 if (!tmpbuf) {
1096 pr_err("Unable to allocate memory for tmpbuf.\n");
1097 return -1;
1098 }
1099
1100 memcpy(tmpbuf, login->req_buf, payload_length);
1101 tmpbuf[payload_length] = '\0';
1102 start = tmpbuf;
1103 end = (start + payload_length);
1104
1105 /*
1106 * Locate the initial keys expected from the Initiator node in
1107 * the first login request in order to progress with the login phase.
1108 */
1109 while (start < end) {
1110 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1111 ret = -1;
1112 goto out;
1113 }
1114
1115 if (!strncmp(key, "InitiatorName", 13))
1116 i_buf = value;
1117 else if (!strncmp(key, "SessionType", 11))
1118 s_buf = value;
1119 else if (!strncmp(key, "TargetName", 10))
1120 t_buf = value;
1121
1122 start += strlen(key) + strlen(value) + 2;
1123 }
1124 /*
1125 * See 5.3. Login Phase.
1126 */
1127 if (!i_buf) {
1128 pr_err("InitiatorName 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);
1132 ret = -1;
1133 goto out;
1134 }
1135 /*
1136 * Convert the incoming InitiatorName to lowercase following
1137 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1138 * are NOT case sensitive.
1139 */
1140 iscsi_initiatorname_tolower(i_buf);
1141
1142 if (!s_buf) {
1143 if (!login->leading_connection)
1144 goto get_target;
1145
1146 pr_err("SessionType key not received"
1147 " in first login request.\n");
1148 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1149 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1150 ret = -1;
1151 goto out;
1152 }
1153
1154 /*
1155 * Use default portal group for discovery sessions.
1156 */
1157 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1158 if (!sessiontype) {
1159 conn->tpg = iscsit_global->discovery_tpg;
1160 if (!login->leading_connection)
1161 goto get_target;
1162
1163 sess->sess_ops->SessionType = 1;
1164 /*
1165 * Setup crc32c modules from libcrypto
1166 */
1167 if (iscsi_login_setup_crypto(conn) < 0) {
1168 pr_err("iscsi_login_setup_crypto() failed\n");
1169 ret = -1;
1170 goto out;
1171 }
1172 /*
1173 * Serialize access across the discovery struct iscsi_portal_group to
1174 * process login attempt.
1175 */
1176 if (iscsit_access_np(np, conn->tpg) < 0) {
1177 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1178 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1179 ret = -1;
1180 goto out;
1181 }
1182 ret = 0;
1183 goto alloc_tags;
1184 }
1185
1186 get_target:
1187 if (!t_buf) {
1188 pr_err("TargetName key not received"
1189 " in first login request while"
1190 " SessionType=Normal.\n");
1191 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1192 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1193 ret = -1;
1194 goto out;
1195 }
1196
1197 /*
1198 * Locate Target IQN from Storage Node.
1199 */
1200 tiqn = iscsit_get_tiqn_for_login(t_buf);
1201 if (!tiqn) {
1202 pr_err("Unable to locate Target IQN: %s in"
1203 " Storage Node\n", t_buf);
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 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1210
1211 /*
1212 * Locate Target Portal Group from Storage Node.
1213 */
1214 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1215 if (!conn->tpg) {
1216 pr_err("Unable to locate Target Portal Group"
1217 " on %s\n", tiqn->tiqn);
1218 iscsit_put_tiqn_for_login(tiqn);
1219 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1220 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1221 ret = -1;
1222 goto out;
1223 }
1224 conn->tpg_np = tpg_np;
1225 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1226 /*
1227 * Setup crc32c modules from libcrypto
1228 */
1229 if (iscsi_login_setup_crypto(conn) < 0) {
1230 pr_err("iscsi_login_setup_crypto() failed\n");
1231 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1232 iscsit_put_tiqn_for_login(tiqn);
1233 conn->tpg = NULL;
1234 ret = -1;
1235 goto out;
1236 }
1237 /*
1238 * Serialize access across the struct iscsi_portal_group to
1239 * process login attempt.
1240 */
1241 if (iscsit_access_np(np, conn->tpg) < 0) {
1242 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1243 iscsit_put_tiqn_for_login(tiqn);
1244 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1245 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1246 conn->tpg = NULL;
1247 ret = -1;
1248 goto out;
1249 }
1250
1251 /*
1252 * conn->sess->node_acl will be set when the referenced
1253 * struct iscsi_session is located from received ISID+TSIH in
1254 * iscsi_login_non_zero_tsih_s2().
1255 */
1256 if (!login->leading_connection) {
1257 ret = 0;
1258 goto out;
1259 }
1260
1261 /*
1262 * This value is required in iscsi_login_zero_tsih_s2()
1263 */
1264 sess->sess_ops->SessionType = 0;
1265
1266 /*
1267 * Locate incoming Initiator IQN reference from Storage Node.
1268 */
1269 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1270 &conn->tpg->tpg_se_tpg, i_buf);
1271 if (!sess->se_sess->se_node_acl) {
1272 pr_err("iSCSI Initiator Node: %s is not authorized to"
1273 " access iSCSI target portal group: %hu.\n",
1274 i_buf, conn->tpg->tpgt);
1275 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1276 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1277 ret = -1;
1278 goto out;
1279 }
1280 se_nacl = sess->se_sess->se_node_acl;
1281 queue_depth = se_nacl->queue_depth;
1282 /*
1283 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1284 * depth for non immediate commands, plus extra tags for immediate
1285 * commands.
1286 *
1287 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1288 * in per-cpu-ida tag allocation logic + small queue_depth.
1289 */
1290 alloc_tags:
1291 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1292 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1293 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1294
1295 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1296 if (ret < 0) {
1297 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1298 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1299 ret = -1;
1300 }
1301 out:
1302 kfree(tmpbuf);
1303 return ret;
1304 }
1305
iscsi_target_start_negotiation(struct iscsi_login * login,struct iscsi_conn * conn)1306 int iscsi_target_start_negotiation(
1307 struct iscsi_login *login,
1308 struct iscsi_conn *conn)
1309 {
1310 int ret;
1311
1312 if (conn->sock) {
1313 struct sock *sk = conn->sock->sk;
1314
1315 write_lock_bh(&sk->sk_callback_lock);
1316 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1317 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
1318 write_unlock_bh(&sk->sk_callback_lock);
1319 }
1320 /*
1321 * If iscsi_target_do_login returns zero to signal more PDU
1322 * exchanges are required to complete the login, go ahead and
1323 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection
1324 * is still active.
1325 *
1326 * Otherwise if TCP connection dropped asynchronously, go ahead
1327 * and perform connection cleanup now.
1328 */
1329 ret = iscsi_target_do_login(conn, login);
1330 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
1331 ret = -1;
1332
1333 if (ret < 0) {
1334 cancel_delayed_work_sync(&conn->login_work);
1335 cancel_delayed_work_sync(&conn->login_cleanup_work);
1336 iscsi_target_restore_sock_callbacks(conn);
1337 iscsi_remove_failed_auth_entry(conn);
1338 }
1339 if (ret != 0)
1340 iscsi_target_nego_release(conn);
1341
1342 return ret;
1343 }
1344
iscsi_target_nego_release(struct iscsi_conn * conn)1345 void iscsi_target_nego_release(struct iscsi_conn *conn)
1346 {
1347 struct iscsi_login *login = conn->conn_login;
1348
1349 if (!login)
1350 return;
1351
1352 kfree(login->req_buf);
1353 kfree(login->rsp_buf);
1354 kfree(login);
1355
1356 conn->conn_login = NULL;
1357 }
1358