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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target...
[mirror_ubuntu-zesty-kernel.git] / drivers / target / iscsi / iscsi_target_nego.c
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 <target/iscsi/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
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
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
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
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
178 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
179 {
180 kfree(conn->auth_protocol);
181 }
182
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
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
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_login_rsp *login_rsp;
345
346 login_rsp = (struct iscsi_login_rsp *) login->rsp;
347
348 login_rsp->opcode = ISCSI_OP_LOGIN_RSP;
349 hton24(login_rsp->dlength, login->rsp_length);
350 memcpy(login_rsp->isid, login->isid, 6);
351 login_rsp->tsih = cpu_to_be16(login->tsih);
352 login_rsp->itt = login->init_task_tag;
353 login_rsp->statsn = cpu_to_be32(conn->stat_sn++);
354 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
355 login_rsp->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
356
357 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
358 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
359 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
360 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
361 ntohl(login_rsp->statsn), login->rsp_length);
362
363 padding = ((-login->rsp_length) & 3);
364 /*
365 * Before sending the last login response containing the transition
366 * bit for full-feature-phase, go ahead and start up TX/RX threads
367 * now to avoid potential resource allocation failures after the
368 * final login response has been sent.
369 */
370 if (login->login_complete) {
371 int rc = iscsit_start_kthreads(conn);
372 if (rc) {
373 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
374 ISCSI_LOGIN_STATUS_NO_RESOURCES);
375 return -1;
376 }
377 }
378
379 if (conn->conn_transport->iscsit_put_login_tx(conn, login,
380 login->rsp_length + padding) < 0)
381 goto err;
382
383 login->rsp_length = 0;
384
385 return 0;
386
387 err:
388 if (login->login_complete) {
389 if (conn->rx_thread && conn->rx_thread_active) {
390 send_sig(SIGINT, conn->rx_thread, 1);
391 kthread_stop(conn->rx_thread);
392 }
393 if (conn->tx_thread && conn->tx_thread_active) {
394 send_sig(SIGINT, conn->tx_thread, 1);
395 kthread_stop(conn->tx_thread);
396 }
397 spin_lock(&iscsit_global->ts_bitmap_lock);
398 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
399 get_order(1));
400 spin_unlock(&iscsit_global->ts_bitmap_lock);
401 }
402 return -1;
403 }
404
405 static void iscsi_target_sk_data_ready(struct sock *sk)
406 {
407 struct iscsi_conn *conn = sk->sk_user_data;
408 bool rc;
409
410 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
411
412 write_lock_bh(&sk->sk_callback_lock);
413 if (!sk->sk_user_data) {
414 write_unlock_bh(&sk->sk_callback_lock);
415 return;
416 }
417 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
418 write_unlock_bh(&sk->sk_callback_lock);
419 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
420 return;
421 }
422 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
423 write_unlock_bh(&sk->sk_callback_lock);
424 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
425 return;
426 }
427 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
428 write_unlock_bh(&sk->sk_callback_lock);
429 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
430 return;
431 }
432
433 rc = schedule_delayed_work(&conn->login_work, 0);
434 if (!rc) {
435 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
436 " got false\n");
437 }
438 write_unlock_bh(&sk->sk_callback_lock);
439 }
440
441 static void iscsi_target_sk_state_change(struct sock *);
442
443 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
444 {
445 struct sock *sk;
446
447 if (!conn->sock)
448 return;
449
450 sk = conn->sock->sk;
451 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
452
453 write_lock_bh(&sk->sk_callback_lock);
454 sk->sk_user_data = conn;
455 conn->orig_data_ready = sk->sk_data_ready;
456 conn->orig_state_change = sk->sk_state_change;
457 sk->sk_data_ready = iscsi_target_sk_data_ready;
458 sk->sk_state_change = iscsi_target_sk_state_change;
459 write_unlock_bh(&sk->sk_callback_lock);
460
461 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
462 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
463 }
464
465 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
466 {
467 struct sock *sk;
468
469 if (!conn->sock)
470 return;
471
472 sk = conn->sock->sk;
473 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
474
475 write_lock_bh(&sk->sk_callback_lock);
476 if (!sk->sk_user_data) {
477 write_unlock_bh(&sk->sk_callback_lock);
478 return;
479 }
480 sk->sk_user_data = NULL;
481 sk->sk_data_ready = conn->orig_data_ready;
482 sk->sk_state_change = conn->orig_state_change;
483 write_unlock_bh(&sk->sk_callback_lock);
484
485 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
486 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
487 }
488
489 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
490
491 static bool iscsi_target_sk_state_check(struct sock *sk)
492 {
493 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
494 pr_debug("iscsi_target_sk_state_check: TCP_CLOSE_WAIT|TCP_CLOSE,"
495 "returning FALSE\n");
496 return false;
497 }
498 return true;
499 }
500
501 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
502 {
503 struct iscsi_np *np = login->np;
504 bool zero_tsih = login->zero_tsih;
505
506 iscsi_remove_failed_auth_entry(conn);
507 iscsi_target_nego_release(conn);
508 iscsi_target_login_sess_out(conn, np, zero_tsih, true);
509 }
510
511 static void iscsi_target_login_timeout(unsigned long data)
512 {
513 struct iscsi_conn *conn = (struct iscsi_conn *)data;
514
515 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
516
517 if (conn->login_kworker) {
518 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
519 conn->login_kworker->comm, conn->login_kworker->pid);
520 send_sig(SIGINT, conn->login_kworker, 1);
521 }
522 }
523
524 static void iscsi_target_do_login_rx(struct work_struct *work)
525 {
526 struct iscsi_conn *conn = container_of(work,
527 struct iscsi_conn, login_work.work);
528 struct iscsi_login *login = conn->login;
529 struct iscsi_np *np = login->np;
530 struct iscsi_portal_group *tpg = conn->tpg;
531 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
532 struct timer_list login_timer;
533 int rc, zero_tsih = login->zero_tsih;
534 bool state;
535
536 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
537 conn, current->comm, current->pid);
538
539 spin_lock(&tpg->tpg_state_lock);
540 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
541 spin_unlock(&tpg->tpg_state_lock);
542
543 if (!state) {
544 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
545 iscsi_target_restore_sock_callbacks(conn);
546 iscsi_target_login_drop(conn, login);
547 iscsit_deaccess_np(np, tpg, tpg_np);
548 return;
549 }
550
551 if (conn->sock) {
552 struct sock *sk = conn->sock->sk;
553
554 read_lock_bh(&sk->sk_callback_lock);
555 state = iscsi_target_sk_state_check(sk);
556 read_unlock_bh(&sk->sk_callback_lock);
557
558 if (!state) {
559 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
560 iscsi_target_restore_sock_callbacks(conn);
561 iscsi_target_login_drop(conn, login);
562 iscsit_deaccess_np(np, tpg, tpg_np);
563 return;
564 }
565 }
566
567 conn->login_kworker = current;
568 allow_signal(SIGINT);
569
570 init_timer(&login_timer);
571 login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
572 login_timer.data = (unsigned long)conn;
573 login_timer.function = iscsi_target_login_timeout;
574 add_timer(&login_timer);
575 pr_debug("Starting login_timer for %s/%d\n", current->comm, current->pid);
576
577 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
578 del_timer_sync(&login_timer);
579 flush_signals(current);
580 conn->login_kworker = NULL;
581
582 if (rc < 0) {
583 iscsi_target_restore_sock_callbacks(conn);
584 iscsi_target_login_drop(conn, login);
585 iscsit_deaccess_np(np, tpg, tpg_np);
586 return;
587 }
588
589 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
590 conn, current->comm, current->pid);
591
592 rc = iscsi_target_do_login(conn, login);
593 if (rc < 0) {
594 iscsi_target_restore_sock_callbacks(conn);
595 iscsi_target_login_drop(conn, login);
596 iscsit_deaccess_np(np, tpg, tpg_np);
597 } else if (!rc) {
598 if (conn->sock) {
599 struct sock *sk = conn->sock->sk;
600
601 write_lock_bh(&sk->sk_callback_lock);
602 clear_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags);
603 write_unlock_bh(&sk->sk_callback_lock);
604 }
605 } else if (rc == 1) {
606 iscsi_target_nego_release(conn);
607 iscsi_post_login_handler(np, conn, zero_tsih);
608 iscsit_deaccess_np(np, tpg, tpg_np);
609 }
610 }
611
612 static void iscsi_target_do_cleanup(struct work_struct *work)
613 {
614 struct iscsi_conn *conn = container_of(work,
615 struct iscsi_conn, login_cleanup_work.work);
616 struct sock *sk = conn->sock->sk;
617 struct iscsi_login *login = conn->login;
618 struct iscsi_np *np = login->np;
619 struct iscsi_portal_group *tpg = conn->tpg;
620 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
621
622 pr_debug("Entering iscsi_target_do_cleanup\n");
623
624 cancel_delayed_work_sync(&conn->login_work);
625 conn->orig_state_change(sk);
626
627 iscsi_target_restore_sock_callbacks(conn);
628 iscsi_target_login_drop(conn, login);
629 iscsit_deaccess_np(np, tpg, tpg_np);
630
631 pr_debug("iscsi_target_do_cleanup done()\n");
632 }
633
634 static void iscsi_target_sk_state_change(struct sock *sk)
635 {
636 struct iscsi_conn *conn;
637 void (*orig_state_change)(struct sock *);
638 bool state;
639
640 pr_debug("Entering iscsi_target_sk_state_change\n");
641
642 write_lock_bh(&sk->sk_callback_lock);
643 conn = sk->sk_user_data;
644 if (!conn) {
645 write_unlock_bh(&sk->sk_callback_lock);
646 return;
647 }
648 orig_state_change = conn->orig_state_change;
649
650 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
651 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
652 conn);
653 write_unlock_bh(&sk->sk_callback_lock);
654 orig_state_change(sk);
655 return;
656 }
657 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
658 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
659 " conn: %p\n", conn);
660 write_unlock_bh(&sk->sk_callback_lock);
661 orig_state_change(sk);
662 return;
663 }
664 if (test_and_set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
665 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
666 conn);
667 write_unlock_bh(&sk->sk_callback_lock);
668 orig_state_change(sk);
669 return;
670 }
671
672 state = iscsi_target_sk_state_check(sk);
673 write_unlock_bh(&sk->sk_callback_lock);
674
675 pr_debug("iscsi_target_sk_state_change: state: %d\n", state);
676
677 if (!state) {
678 pr_debug("iscsi_target_sk_state_change got failed state\n");
679 schedule_delayed_work(&conn->login_cleanup_work, 0);
680 return;
681 }
682 orig_state_change(sk);
683 }
684
685 /*
686 * NOTE: We check for existing sessions or connections AFTER the initiator
687 * has been successfully authenticated in order to protect against faked
688 * ISID/TSIH combinations.
689 */
690 static int iscsi_target_check_for_existing_instances(
691 struct iscsi_conn *conn,
692 struct iscsi_login *login)
693 {
694 if (login->checked_for_existing)
695 return 0;
696
697 login->checked_for_existing = 1;
698
699 if (!login->tsih)
700 return iscsi_check_for_session_reinstatement(conn);
701 else
702 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
703 login->initial_exp_statsn);
704 }
705
706 static int iscsi_target_do_authentication(
707 struct iscsi_conn *conn,
708 struct iscsi_login *login)
709 {
710 int authret;
711 u32 payload_length;
712 struct iscsi_param *param;
713 struct iscsi_login_req *login_req;
714 struct iscsi_login_rsp *login_rsp;
715
716 login_req = (struct iscsi_login_req *) login->req;
717 login_rsp = (struct iscsi_login_rsp *) login->rsp;
718 payload_length = ntoh24(login_req->dlength);
719
720 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
721 if (!param)
722 return -1;
723
724 authret = iscsi_handle_authentication(
725 conn,
726 login->req_buf,
727 login->rsp_buf,
728 payload_length,
729 &login->rsp_length,
730 param->value);
731 switch (authret) {
732 case 0:
733 pr_debug("Received OK response"
734 " from LIO Authentication, continuing.\n");
735 break;
736 case 1:
737 pr_debug("iSCSI security negotiation"
738 " completed successfully.\n");
739 login->auth_complete = 1;
740 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
741 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
742 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
743 ISCSI_FLAG_LOGIN_TRANSIT);
744 login->current_stage = 1;
745 }
746 return iscsi_target_check_for_existing_instances(
747 conn, login);
748 case 2:
749 pr_err("Security negotiation"
750 " failed.\n");
751 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
752 ISCSI_LOGIN_STATUS_AUTH_FAILED);
753 return -1;
754 default:
755 pr_err("Received unknown error %d from LIO"
756 " Authentication\n", authret);
757 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
758 ISCSI_LOGIN_STATUS_TARGET_ERROR);
759 return -1;
760 }
761
762 return 0;
763 }
764
765 static int iscsi_target_handle_csg_zero(
766 struct iscsi_conn *conn,
767 struct iscsi_login *login)
768 {
769 int ret;
770 u32 payload_length;
771 struct iscsi_param *param;
772 struct iscsi_login_req *login_req;
773 struct iscsi_login_rsp *login_rsp;
774
775 login_req = (struct iscsi_login_req *) login->req;
776 login_rsp = (struct iscsi_login_rsp *) login->rsp;
777 payload_length = ntoh24(login_req->dlength);
778
779 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
780 if (!param)
781 return -1;
782
783 ret = iscsi_decode_text_input(
784 PHASE_SECURITY|PHASE_DECLARATIVE,
785 SENDER_INITIATOR|SENDER_RECEIVER,
786 login->req_buf,
787 payload_length,
788 conn);
789 if (ret < 0)
790 return -1;
791
792 if (ret > 0) {
793 if (login->auth_complete) {
794 pr_err("Initiator has already been"
795 " successfully authenticated, but is still"
796 " sending %s keys.\n", param->value);
797 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
798 ISCSI_LOGIN_STATUS_INIT_ERR);
799 return -1;
800 }
801
802 goto do_auth;
803 } else if (!payload_length) {
804 pr_err("Initiator sent zero length security payload,"
805 " login failed\n");
806 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
807 ISCSI_LOGIN_STATUS_AUTH_FAILED);
808 return -1;
809 }
810
811 if (login->first_request)
812 if (iscsi_target_check_first_request(conn, login) < 0)
813 return -1;
814
815 ret = iscsi_encode_text_output(
816 PHASE_SECURITY|PHASE_DECLARATIVE,
817 SENDER_TARGET,
818 login->rsp_buf,
819 &login->rsp_length,
820 conn->param_list);
821 if (ret < 0)
822 return -1;
823
824 if (!iscsi_check_negotiated_keys(conn->param_list)) {
825 if (conn->tpg->tpg_attrib.authentication &&
826 !strncmp(param->value, NONE, 4)) {
827 pr_err("Initiator sent AuthMethod=None but"
828 " Target is enforcing iSCSI Authentication,"
829 " login failed.\n");
830 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
831 ISCSI_LOGIN_STATUS_AUTH_FAILED);
832 return -1;
833 }
834
835 if (conn->tpg->tpg_attrib.authentication &&
836 !login->auth_complete)
837 return 0;
838
839 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
840 return 0;
841
842 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
843 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
844 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
845 ISCSI_FLAG_LOGIN_TRANSIT;
846 login->current_stage = 1;
847 }
848 }
849
850 return 0;
851 do_auth:
852 return iscsi_target_do_authentication(conn, login);
853 }
854
855 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
856 {
857 int ret;
858 u32 payload_length;
859 struct iscsi_login_req *login_req;
860 struct iscsi_login_rsp *login_rsp;
861
862 login_req = (struct iscsi_login_req *) login->req;
863 login_rsp = (struct iscsi_login_rsp *) login->rsp;
864 payload_length = ntoh24(login_req->dlength);
865
866 ret = iscsi_decode_text_input(
867 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
868 SENDER_INITIATOR|SENDER_RECEIVER,
869 login->req_buf,
870 payload_length,
871 conn);
872 if (ret < 0) {
873 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
874 ISCSI_LOGIN_STATUS_INIT_ERR);
875 return -1;
876 }
877
878 if (login->first_request)
879 if (iscsi_target_check_first_request(conn, login) < 0)
880 return -1;
881
882 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
883 return -1;
884
885 ret = iscsi_encode_text_output(
886 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
887 SENDER_TARGET,
888 login->rsp_buf,
889 &login->rsp_length,
890 conn->param_list);
891 if (ret < 0) {
892 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
893 ISCSI_LOGIN_STATUS_INIT_ERR);
894 return -1;
895 }
896
897 if (!login->auth_complete &&
898 conn->tpg->tpg_attrib.authentication) {
899 pr_err("Initiator is requesting CSG: 1, has not been"
900 " successfully authenticated, and the Target is"
901 " enforcing iSCSI Authentication, login failed.\n");
902 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
903 ISCSI_LOGIN_STATUS_AUTH_FAILED);
904 return -1;
905 }
906
907 if (!iscsi_check_negotiated_keys(conn->param_list))
908 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
909 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
910 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
911 ISCSI_FLAG_LOGIN_TRANSIT;
912
913 return 0;
914 }
915
916 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
917 {
918 int pdu_count = 0;
919 struct iscsi_login_req *login_req;
920 struct iscsi_login_rsp *login_rsp;
921
922 login_req = (struct iscsi_login_req *) login->req;
923 login_rsp = (struct iscsi_login_rsp *) login->rsp;
924
925 while (1) {
926 if (++pdu_count > MAX_LOGIN_PDUS) {
927 pr_err("MAX_LOGIN_PDUS count reached.\n");
928 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
929 ISCSI_LOGIN_STATUS_TARGET_ERROR);
930 return -1;
931 }
932
933 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
934 case 0:
935 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
936 if (iscsi_target_handle_csg_zero(conn, login) < 0)
937 return -1;
938 break;
939 case 1:
940 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
941 if (iscsi_target_handle_csg_one(conn, login) < 0)
942 return -1;
943 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
944 login->tsih = conn->sess->tsih;
945 login->login_complete = 1;
946 iscsi_target_restore_sock_callbacks(conn);
947 if (iscsi_target_do_tx_login_io(conn,
948 login) < 0)
949 return -1;
950 return 1;
951 }
952 break;
953 default:
954 pr_err("Illegal CSG: %d received from"
955 " Initiator, protocol error.\n",
956 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
957 break;
958 }
959
960 if (iscsi_target_do_tx_login_io(conn, login) < 0)
961 return -1;
962
963 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
964 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
965 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
966 }
967 break;
968 }
969
970 if (conn->sock) {
971 struct sock *sk = conn->sock->sk;
972 bool state;
973
974 read_lock_bh(&sk->sk_callback_lock);
975 state = iscsi_target_sk_state_check(sk);
976 read_unlock_bh(&sk->sk_callback_lock);
977
978 if (!state) {
979 pr_debug("iscsi_target_do_login() failed state for"
980 " conn: %p\n", conn);
981 return -1;
982 }
983 }
984
985 return 0;
986 }
987
988 static void iscsi_initiatorname_tolower(
989 char *param_buf)
990 {
991 char *c;
992 u32 iqn_size = strlen(param_buf), i;
993
994 for (i = 0; i < iqn_size; i++) {
995 c = &param_buf[i];
996 if (!isupper(*c))
997 continue;
998
999 *c = tolower(*c);
1000 }
1001 }
1002
1003 /*
1004 * Processes the first Login Request..
1005 */
1006 int iscsi_target_locate_portal(
1007 struct iscsi_np *np,
1008 struct iscsi_conn *conn,
1009 struct iscsi_login *login)
1010 {
1011 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1012 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1013 struct iscsi_session *sess = conn->sess;
1014 struct iscsi_tiqn *tiqn;
1015 struct iscsi_tpg_np *tpg_np = NULL;
1016 struct iscsi_login_req *login_req;
1017 struct se_node_acl *se_nacl;
1018 u32 payload_length, queue_depth = 0;
1019 int sessiontype = 0, ret = 0, tag_num, tag_size;
1020
1021 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1022 INIT_DELAYED_WORK(&conn->login_cleanup_work, iscsi_target_do_cleanup);
1023 iscsi_target_set_sock_callbacks(conn);
1024
1025 login->np = np;
1026
1027 login_req = (struct iscsi_login_req *) login->req;
1028 payload_length = ntoh24(login_req->dlength);
1029
1030 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1031 if (!tmpbuf) {
1032 pr_err("Unable to allocate memory for tmpbuf.\n");
1033 return -1;
1034 }
1035
1036 memcpy(tmpbuf, login->req_buf, payload_length);
1037 tmpbuf[payload_length] = '\0';
1038 start = tmpbuf;
1039 end = (start + payload_length);
1040
1041 /*
1042 * Locate the initial keys expected from the Initiator node in
1043 * the first login request in order to progress with the login phase.
1044 */
1045 while (start < end) {
1046 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1047 ret = -1;
1048 goto out;
1049 }
1050
1051 if (!strncmp(key, "InitiatorName", 13))
1052 i_buf = value;
1053 else if (!strncmp(key, "SessionType", 11))
1054 s_buf = value;
1055 else if (!strncmp(key, "TargetName", 10))
1056 t_buf = value;
1057
1058 start += strlen(key) + strlen(value) + 2;
1059 }
1060 /*
1061 * See 5.3. Login Phase.
1062 */
1063 if (!i_buf) {
1064 pr_err("InitiatorName key not received"
1065 " in first login request.\n");
1066 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1067 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1068 ret = -1;
1069 goto out;
1070 }
1071 /*
1072 * Convert the incoming InitiatorName to lowercase following
1073 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1074 * are NOT case sensitive.
1075 */
1076 iscsi_initiatorname_tolower(i_buf);
1077
1078 if (!s_buf) {
1079 if (!login->leading_connection)
1080 goto get_target;
1081
1082 pr_err("SessionType key not received"
1083 " in first login request.\n");
1084 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1085 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1086 ret = -1;
1087 goto out;
1088 }
1089
1090 /*
1091 * Use default portal group for discovery sessions.
1092 */
1093 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1094 if (!sessiontype) {
1095 conn->tpg = iscsit_global->discovery_tpg;
1096 if (!login->leading_connection)
1097 goto get_target;
1098
1099 sess->sess_ops->SessionType = 1;
1100 /*
1101 * Setup crc32c modules from libcrypto
1102 */
1103 if (iscsi_login_setup_crypto(conn) < 0) {
1104 pr_err("iscsi_login_setup_crypto() failed\n");
1105 ret = -1;
1106 goto out;
1107 }
1108 /*
1109 * Serialize access across the discovery struct iscsi_portal_group to
1110 * process login attempt.
1111 */
1112 if (iscsit_access_np(np, conn->tpg) < 0) {
1113 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1114 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1115 ret = -1;
1116 goto out;
1117 }
1118 ret = 0;
1119 goto alloc_tags;
1120 }
1121
1122 get_target:
1123 if (!t_buf) {
1124 pr_err("TargetName key not received"
1125 " in first login request while"
1126 " SessionType=Normal.\n");
1127 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1128 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1129 ret = -1;
1130 goto out;
1131 }
1132
1133 /*
1134 * Locate Target IQN from Storage Node.
1135 */
1136 tiqn = iscsit_get_tiqn_for_login(t_buf);
1137 if (!tiqn) {
1138 pr_err("Unable to locate Target IQN: %s in"
1139 " Storage Node\n", t_buf);
1140 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1141 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1142 ret = -1;
1143 goto out;
1144 }
1145 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1146
1147 /*
1148 * Locate Target Portal Group from Storage Node.
1149 */
1150 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1151 if (!conn->tpg) {
1152 pr_err("Unable to locate Target Portal Group"
1153 " on %s\n", tiqn->tiqn);
1154 iscsit_put_tiqn_for_login(tiqn);
1155 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1156 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1157 ret = -1;
1158 goto out;
1159 }
1160 conn->tpg_np = tpg_np;
1161 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1162 /*
1163 * Setup crc32c modules from libcrypto
1164 */
1165 if (iscsi_login_setup_crypto(conn) < 0) {
1166 pr_err("iscsi_login_setup_crypto() failed\n");
1167 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1168 iscsit_put_tiqn_for_login(tiqn);
1169 conn->tpg = NULL;
1170 ret = -1;
1171 goto out;
1172 }
1173 /*
1174 * Serialize access across the struct iscsi_portal_group to
1175 * process login attempt.
1176 */
1177 if (iscsit_access_np(np, conn->tpg) < 0) {
1178 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1179 iscsit_put_tiqn_for_login(tiqn);
1180 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1181 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1182 conn->tpg = NULL;
1183 ret = -1;
1184 goto out;
1185 }
1186
1187 /*
1188 * conn->sess->node_acl will be set when the referenced
1189 * struct iscsi_session is located from received ISID+TSIH in
1190 * iscsi_login_non_zero_tsih_s2().
1191 */
1192 if (!login->leading_connection) {
1193 ret = 0;
1194 goto out;
1195 }
1196
1197 /*
1198 * This value is required in iscsi_login_zero_tsih_s2()
1199 */
1200 sess->sess_ops->SessionType = 0;
1201
1202 /*
1203 * Locate incoming Initiator IQN reference from Storage Node.
1204 */
1205 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1206 &conn->tpg->tpg_se_tpg, i_buf);
1207 if (!sess->se_sess->se_node_acl) {
1208 pr_err("iSCSI Initiator Node: %s is not authorized to"
1209 " access iSCSI target portal group: %hu.\n",
1210 i_buf, conn->tpg->tpgt);
1211 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1212 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1213 ret = -1;
1214 goto out;
1215 }
1216 se_nacl = sess->se_sess->se_node_acl;
1217 queue_depth = se_nacl->queue_depth;
1218 /*
1219 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1220 * depth for non immediate commands, plus extra tags for immediate
1221 * commands.
1222 *
1223 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1224 * in per-cpu-ida tag allocation logic + small queue_depth.
1225 */
1226 alloc_tags:
1227 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1228 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1229 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1230
1231 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1232 if (ret < 0) {
1233 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1234 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1235 ret = -1;
1236 }
1237 out:
1238 kfree(tmpbuf);
1239 return ret;
1240 }
1241
1242 int iscsi_target_start_negotiation(
1243 struct iscsi_login *login,
1244 struct iscsi_conn *conn)
1245 {
1246 int ret;
1247
1248 ret = iscsi_target_do_login(conn, login);
1249 if (!ret) {
1250 if (conn->sock) {
1251 struct sock *sk = conn->sock->sk;
1252
1253 write_lock_bh(&sk->sk_callback_lock);
1254 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1255 write_unlock_bh(&sk->sk_callback_lock);
1256 }
1257 } else if (ret < 0) {
1258 cancel_delayed_work_sync(&conn->login_work);
1259 cancel_delayed_work_sync(&conn->login_cleanup_work);
1260 iscsi_target_restore_sock_callbacks(conn);
1261 iscsi_remove_failed_auth_entry(conn);
1262 }
1263 if (ret != 0)
1264 iscsi_target_nego_release(conn);
1265
1266 return ret;
1267 }
1268
1269 void iscsi_target_nego_release(struct iscsi_conn *conn)
1270 {
1271 struct iscsi_login *login = conn->conn_login;
1272
1273 if (!login)
1274 return;
1275
1276 kfree(login->req_buf);
1277 kfree(login->rsp_buf);
1278 kfree(login);
1279
1280 conn->conn_login = NULL;
1281 }
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