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target/iscsi: Remove macros that contain typecasts
[deliverable/linux.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 <scsi/iscsi_proto.h>
21 #include <target/target_core_base.h>
22 #include <target/target_core_fabric.h>
23 #include <target/iscsi/iscsi_transport.h>
24
25 #include "iscsi_target_core.h"
26 #include "iscsi_target_parameters.h"
27 #include "iscsi_target_login.h"
28 #include "iscsi_target_nego.h"
29 #include "iscsi_target_tpg.h"
30 #include "iscsi_target_util.h"
31 #include "iscsi_target.h"
32 #include "iscsi_target_auth.h"
33
34 #define MAX_LOGIN_PDUS 7
35 #define TEXT_LEN 4096
36
37 void convert_null_to_semi(char *buf, int len)
38 {
39 int i;
40
41 for (i = 0; i < len; i++)
42 if (buf[i] == '\0')
43 buf[i] = ';';
44 }
45
46 static int strlen_semi(char *buf)
47 {
48 int i = 0;
49
50 while (buf[i] != '\0') {
51 if (buf[i] == ';')
52 return i;
53 i++;
54 }
55
56 return -1;
57 }
58
59 int extract_param(
60 const char *in_buf,
61 const char *pattern,
62 unsigned int max_length,
63 char *out_buf,
64 unsigned char *type)
65 {
66 char *ptr;
67 int len;
68
69 if (!in_buf || !pattern || !out_buf || !type)
70 return -1;
71
72 ptr = strstr(in_buf, pattern);
73 if (!ptr)
74 return -1;
75
76 ptr = strstr(ptr, "=");
77 if (!ptr)
78 return -1;
79
80 ptr += 1;
81 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
82 ptr += 2; /* skip 0x */
83 *type = HEX;
84 } else
85 *type = DECIMAL;
86
87 len = strlen_semi(ptr);
88 if (len < 0)
89 return -1;
90
91 if (len > max_length) {
92 pr_err("Length of input: %d exceeds max_length:"
93 " %d\n", len, max_length);
94 return -1;
95 }
96 memcpy(out_buf, ptr, len);
97 out_buf[len] = '\0';
98
99 return 0;
100 }
101
102 static u32 iscsi_handle_authentication(
103 struct iscsi_conn *conn,
104 char *in_buf,
105 char *out_buf,
106 int in_length,
107 int *out_length,
108 unsigned char *authtype)
109 {
110 struct iscsi_session *sess = conn->sess;
111 struct iscsi_node_auth *auth;
112 struct iscsi_node_acl *iscsi_nacl;
113 struct iscsi_portal_group *iscsi_tpg;
114 struct se_node_acl *se_nacl;
115
116 if (!sess->sess_ops->SessionType) {
117 /*
118 * For SessionType=Normal
119 */
120 se_nacl = conn->sess->se_sess->se_node_acl;
121 if (!se_nacl) {
122 pr_err("Unable to locate struct se_node_acl for"
123 " CHAP auth\n");
124 return -1;
125 }
126 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
127 se_node_acl);
128 if (!iscsi_nacl) {
129 pr_err("Unable to locate struct iscsi_node_acl for"
130 " CHAP auth\n");
131 return -1;
132 }
133
134 if (se_nacl->dynamic_node_acl) {
135 iscsi_tpg = container_of(se_nacl->se_tpg,
136 struct iscsi_portal_group, tpg_se_tpg);
137
138 auth = &iscsi_tpg->tpg_demo_auth;
139 } else {
140 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
141 se_node_acl);
142
143 auth = &iscsi_nacl->node_auth;
144 }
145 } else {
146 /*
147 * For SessionType=Discovery
148 */
149 auth = &iscsit_global->discovery_acl.node_auth;
150 }
151
152 if (strstr("CHAP", authtype))
153 strcpy(conn->sess->auth_type, "CHAP");
154 else
155 strcpy(conn->sess->auth_type, NONE);
156
157 if (strstr("None", authtype))
158 return 1;
159 #ifdef CANSRP
160 else if (strstr("SRP", authtype))
161 return srp_main_loop(conn, auth, in_buf, out_buf,
162 &in_length, out_length);
163 #endif
164 else if (strstr("CHAP", authtype))
165 return chap_main_loop(conn, auth, in_buf, out_buf,
166 &in_length, out_length);
167 else if (strstr("SPKM1", authtype))
168 return 2;
169 else if (strstr("SPKM2", authtype))
170 return 2;
171 else if (strstr("KRB5", authtype))
172 return 2;
173 else
174 return 2;
175 }
176
177 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
178 {
179 kfree(conn->auth_protocol);
180 }
181
182 int iscsi_target_check_login_request(
183 struct iscsi_conn *conn,
184 struct iscsi_login *login)
185 {
186 int req_csg, req_nsg;
187 u32 payload_length;
188 struct iscsi_login_req *login_req;
189
190 login_req = (struct iscsi_login_req *) login->req;
191 payload_length = ntoh24(login_req->dlength);
192
193 switch (login_req->opcode & ISCSI_OPCODE_MASK) {
194 case ISCSI_OP_LOGIN:
195 break;
196 default:
197 pr_err("Received unknown opcode 0x%02x.\n",
198 login_req->opcode & ISCSI_OPCODE_MASK);
199 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
200 ISCSI_LOGIN_STATUS_INIT_ERR);
201 return -1;
202 }
203
204 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
205 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
206 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
207 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
208 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
209 ISCSI_LOGIN_STATUS_INIT_ERR);
210 return -1;
211 }
212
213 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
214 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
215
216 if (req_csg != login->current_stage) {
217 pr_err("Initiator unexpectedly changed login stage"
218 " from %d to %d, login failed.\n", login->current_stage,
219 req_csg);
220 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
221 ISCSI_LOGIN_STATUS_INIT_ERR);
222 return -1;
223 }
224
225 if ((req_nsg == 2) || (req_csg >= 2) ||
226 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
227 (req_nsg <= req_csg))) {
228 pr_err("Illegal login_req->flags Combination, CSG: %d,"
229 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
230 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
231 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
232 ISCSI_LOGIN_STATUS_INIT_ERR);
233 return -1;
234 }
235
236 if ((login_req->max_version != login->version_max) ||
237 (login_req->min_version != login->version_min)) {
238 pr_err("Login request changed Version Max/Nin"
239 " unexpectedly to 0x%02x/0x%02x, protocol error\n",
240 login_req->max_version, login_req->min_version);
241 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
242 ISCSI_LOGIN_STATUS_INIT_ERR);
243 return -1;
244 }
245
246 if (memcmp(login_req->isid, login->isid, 6) != 0) {
247 pr_err("Login request changed ISID unexpectedly,"
248 " protocol error.\n");
249 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
250 ISCSI_LOGIN_STATUS_INIT_ERR);
251 return -1;
252 }
253
254 if (login_req->itt != login->init_task_tag) {
255 pr_err("Login request changed ITT unexpectedly to"
256 " 0x%08x, protocol error.\n", login_req->itt);
257 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
258 ISCSI_LOGIN_STATUS_INIT_ERR);
259 return -1;
260 }
261
262 if (payload_length > MAX_KEY_VALUE_PAIRS) {
263 pr_err("Login request payload exceeds default"
264 " MaxRecvDataSegmentLength: %u, protocol error.\n",
265 MAX_KEY_VALUE_PAIRS);
266 return -1;
267 }
268
269 return 0;
270 }
271
272 static int iscsi_target_check_first_request(
273 struct iscsi_conn *conn,
274 struct iscsi_login *login)
275 {
276 struct iscsi_param *param = NULL;
277 struct se_node_acl *se_nacl;
278
279 login->first_request = 0;
280
281 list_for_each_entry(param, &conn->param_list->param_list, p_list) {
282 if (!strncmp(param->name, SESSIONTYPE, 11)) {
283 if (!IS_PSTATE_ACCEPTOR(param)) {
284 pr_err("SessionType key not received"
285 " in first login request.\n");
286 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
287 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
288 return -1;
289 }
290 if (!strncmp(param->value, DISCOVERY, 9))
291 return 0;
292 }
293
294 if (!strncmp(param->name, INITIATORNAME, 13)) {
295 if (!IS_PSTATE_ACCEPTOR(param)) {
296 if (!login->leading_connection)
297 continue;
298
299 pr_err("InitiatorName key not received"
300 " in first login request.\n");
301 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
302 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
303 return -1;
304 }
305
306 /*
307 * For non-leading connections, double check that the
308 * received InitiatorName matches the existing session's
309 * struct iscsi_node_acl.
310 */
311 if (!login->leading_connection) {
312 se_nacl = conn->sess->se_sess->se_node_acl;
313 if (!se_nacl) {
314 pr_err("Unable to locate"
315 " struct se_node_acl\n");
316 iscsit_tx_login_rsp(conn,
317 ISCSI_STATUS_CLS_INITIATOR_ERR,
318 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
319 return -1;
320 }
321
322 if (strcmp(param->value,
323 se_nacl->initiatorname)) {
324 pr_err("Incorrect"
325 " InitiatorName: %s for this"
326 " iSCSI Initiator Node.\n",
327 param->value);
328 iscsit_tx_login_rsp(conn,
329 ISCSI_STATUS_CLS_INITIATOR_ERR,
330 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
331 return -1;
332 }
333 }
334 }
335 }
336
337 return 0;
338 }
339
340 static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
341 {
342 u32 padding = 0;
343 struct iscsi_session *sess = conn->sess;
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(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 if (conn->conn_transport->iscsit_put_login_tx(conn, login,
366 login->rsp_length + padding) < 0)
367 return -1;
368
369 login->rsp_length = 0;
370 mutex_lock(&sess->cmdsn_mutex);
371 login_rsp->exp_cmdsn = cpu_to_be32(sess->exp_cmd_sn);
372 login_rsp->max_cmdsn = cpu_to_be32(sess->max_cmd_sn);
373 mutex_unlock(&sess->cmdsn_mutex);
374
375 return 0;
376 }
377
378 static void iscsi_target_sk_data_ready(struct sock *sk, int count)
379 {
380 struct iscsi_conn *conn = sk->sk_user_data;
381 bool rc;
382
383 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
384
385 write_lock_bh(&sk->sk_callback_lock);
386 if (!sk->sk_user_data) {
387 write_unlock_bh(&sk->sk_callback_lock);
388 return;
389 }
390 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
391 write_unlock_bh(&sk->sk_callback_lock);
392 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
393 return;
394 }
395 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
396 write_unlock_bh(&sk->sk_callback_lock);
397 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
398 return;
399 }
400 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
401 write_unlock_bh(&sk->sk_callback_lock);
402 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
403 return;
404 }
405
406 rc = schedule_delayed_work(&conn->login_work, 0);
407 if (rc == false) {
408 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
409 " got false\n");
410 }
411 write_unlock_bh(&sk->sk_callback_lock);
412 }
413
414 static void iscsi_target_sk_state_change(struct sock *);
415
416 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
417 {
418 struct sock *sk;
419
420 if (!conn->sock)
421 return;
422
423 sk = conn->sock->sk;
424 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
425
426 write_lock_bh(&sk->sk_callback_lock);
427 sk->sk_user_data = conn;
428 conn->orig_data_ready = sk->sk_data_ready;
429 conn->orig_state_change = sk->sk_state_change;
430 sk->sk_data_ready = iscsi_target_sk_data_ready;
431 sk->sk_state_change = iscsi_target_sk_state_change;
432 write_unlock_bh(&sk->sk_callback_lock);
433
434 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
435 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
436 }
437
438 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
439 {
440 struct sock *sk;
441
442 if (!conn->sock)
443 return;
444
445 sk = conn->sock->sk;
446 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
447
448 write_lock_bh(&sk->sk_callback_lock);
449 if (!sk->sk_user_data) {
450 write_unlock_bh(&sk->sk_callback_lock);
451 return;
452 }
453 sk->sk_user_data = NULL;
454 sk->sk_data_ready = conn->orig_data_ready;
455 sk->sk_state_change = conn->orig_state_change;
456 write_unlock_bh(&sk->sk_callback_lock);
457
458 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
459 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
460 }
461
462 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
463
464 static bool iscsi_target_sk_state_check(struct sock *sk)
465 {
466 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
467 pr_debug("iscsi_target_sk_state_check: TCP_CLOSE_WAIT|TCP_CLOSE,"
468 "returning FALSE\n");
469 return false;
470 }
471 return true;
472 }
473
474 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
475 {
476 struct iscsi_np *np = login->np;
477 bool zero_tsih = login->zero_tsih;
478
479 iscsi_remove_failed_auth_entry(conn);
480 iscsi_target_nego_release(conn);
481 iscsi_target_login_sess_out(conn, np, zero_tsih, true);
482 }
483
484 static void iscsi_target_login_timeout(unsigned long data)
485 {
486 struct iscsi_conn *conn = (struct iscsi_conn *)data;
487
488 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
489
490 if (conn->login_kworker) {
491 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
492 conn->login_kworker->comm, conn->login_kworker->pid);
493 send_sig(SIGINT, conn->login_kworker, 1);
494 }
495 }
496
497 static void iscsi_target_do_login_rx(struct work_struct *work)
498 {
499 struct iscsi_conn *conn = container_of(work,
500 struct iscsi_conn, login_work.work);
501 struct iscsi_login *login = conn->login;
502 struct iscsi_np *np = login->np;
503 struct iscsi_portal_group *tpg = conn->tpg;
504 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
505 struct timer_list login_timer;
506 int rc, zero_tsih = login->zero_tsih;
507 bool state;
508
509 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
510 conn, current->comm, current->pid);
511
512 spin_lock(&tpg->tpg_state_lock);
513 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
514 spin_unlock(&tpg->tpg_state_lock);
515
516 if (state == false) {
517 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
518 iscsi_target_restore_sock_callbacks(conn);
519 iscsi_target_login_drop(conn, login);
520 iscsit_deaccess_np(np, tpg, tpg_np);
521 return;
522 }
523
524 if (conn->sock) {
525 struct sock *sk = conn->sock->sk;
526
527 read_lock_bh(&sk->sk_callback_lock);
528 state = iscsi_target_sk_state_check(sk);
529 read_unlock_bh(&sk->sk_callback_lock);
530
531 if (state == false) {
532 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
533 iscsi_target_restore_sock_callbacks(conn);
534 iscsi_target_login_drop(conn, login);
535 iscsit_deaccess_np(np, tpg, tpg_np);
536 return;
537 }
538 }
539
540 conn->login_kworker = current;
541 allow_signal(SIGINT);
542
543 init_timer(&login_timer);
544 login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
545 login_timer.data = (unsigned long)conn;
546 login_timer.function = iscsi_target_login_timeout;
547 add_timer(&login_timer);
548 pr_debug("Starting login_timer for %s/%d\n", current->comm, current->pid);
549
550 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
551 del_timer_sync(&login_timer);
552 flush_signals(current);
553 conn->login_kworker = NULL;
554
555 if (rc < 0) {
556 iscsi_target_restore_sock_callbacks(conn);
557 iscsi_target_login_drop(conn, login);
558 iscsit_deaccess_np(np, tpg, tpg_np);
559 return;
560 }
561
562 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
563 conn, current->comm, current->pid);
564
565 rc = iscsi_target_do_login(conn, login);
566 if (rc < 0) {
567 iscsi_target_restore_sock_callbacks(conn);
568 iscsi_target_login_drop(conn, login);
569 iscsit_deaccess_np(np, tpg, tpg_np);
570 } else if (!rc) {
571 if (conn->sock) {
572 struct sock *sk = conn->sock->sk;
573
574 write_lock_bh(&sk->sk_callback_lock);
575 clear_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags);
576 write_unlock_bh(&sk->sk_callback_lock);
577 }
578 } else if (rc == 1) {
579 iscsi_target_nego_release(conn);
580 iscsi_post_login_handler(np, conn, zero_tsih);
581 iscsit_deaccess_np(np, tpg, tpg_np);
582 }
583 }
584
585 static void iscsi_target_do_cleanup(struct work_struct *work)
586 {
587 struct iscsi_conn *conn = container_of(work,
588 struct iscsi_conn, login_cleanup_work.work);
589 struct sock *sk = conn->sock->sk;
590 struct iscsi_login *login = conn->login;
591 struct iscsi_np *np = login->np;
592 struct iscsi_portal_group *tpg = conn->tpg;
593 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
594
595 pr_debug("Entering iscsi_target_do_cleanup\n");
596
597 cancel_delayed_work_sync(&conn->login_work);
598 conn->orig_state_change(sk);
599
600 iscsi_target_restore_sock_callbacks(conn);
601 iscsi_target_login_drop(conn, login);
602 iscsit_deaccess_np(np, tpg, tpg_np);
603
604 pr_debug("iscsi_target_do_cleanup done()\n");
605 }
606
607 static void iscsi_target_sk_state_change(struct sock *sk)
608 {
609 struct iscsi_conn *conn;
610 void (*orig_state_change)(struct sock *);
611 bool state;
612
613 pr_debug("Entering iscsi_target_sk_state_change\n");
614
615 write_lock_bh(&sk->sk_callback_lock);
616 conn = sk->sk_user_data;
617 if (!conn) {
618 write_unlock_bh(&sk->sk_callback_lock);
619 return;
620 }
621 orig_state_change = conn->orig_state_change;
622
623 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
624 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
625 conn);
626 write_unlock_bh(&sk->sk_callback_lock);
627 orig_state_change(sk);
628 return;
629 }
630 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
631 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
632 " conn: %p\n", conn);
633 write_unlock_bh(&sk->sk_callback_lock);
634 orig_state_change(sk);
635 return;
636 }
637 if (test_and_set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
638 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
639 conn);
640 write_unlock_bh(&sk->sk_callback_lock);
641 orig_state_change(sk);
642 return;
643 }
644
645 state = iscsi_target_sk_state_check(sk);
646 write_unlock_bh(&sk->sk_callback_lock);
647
648 pr_debug("iscsi_target_sk_state_change: state: %d\n", state);
649
650 if (!state) {
651 pr_debug("iscsi_target_sk_state_change got failed state\n");
652 schedule_delayed_work(&conn->login_cleanup_work, 0);
653 return;
654 }
655 orig_state_change(sk);
656 }
657
658 /*
659 * NOTE: We check for existing sessions or connections AFTER the initiator
660 * has been successfully authenticated in order to protect against faked
661 * ISID/TSIH combinations.
662 */
663 static int iscsi_target_check_for_existing_instances(
664 struct iscsi_conn *conn,
665 struct iscsi_login *login)
666 {
667 if (login->checked_for_existing)
668 return 0;
669
670 login->checked_for_existing = 1;
671
672 if (!login->tsih)
673 return iscsi_check_for_session_reinstatement(conn);
674 else
675 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
676 login->initial_exp_statsn);
677 }
678
679 static int iscsi_target_do_authentication(
680 struct iscsi_conn *conn,
681 struct iscsi_login *login)
682 {
683 int authret;
684 u32 payload_length;
685 struct iscsi_param *param;
686 struct iscsi_login_req *login_req;
687 struct iscsi_login_rsp *login_rsp;
688
689 login_req = (struct iscsi_login_req *) login->req;
690 login_rsp = (struct iscsi_login_rsp *) login->rsp;
691 payload_length = ntoh24(login_req->dlength);
692
693 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
694 if (!param)
695 return -1;
696
697 authret = iscsi_handle_authentication(
698 conn,
699 login->req_buf,
700 login->rsp_buf,
701 payload_length,
702 &login->rsp_length,
703 param->value);
704 switch (authret) {
705 case 0:
706 pr_debug("Received OK response"
707 " from LIO Authentication, continuing.\n");
708 break;
709 case 1:
710 pr_debug("iSCSI security negotiation"
711 " completed successfully.\n");
712 login->auth_complete = 1;
713 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
714 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
715 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
716 ISCSI_FLAG_LOGIN_TRANSIT);
717 login->current_stage = 1;
718 }
719 return iscsi_target_check_for_existing_instances(
720 conn, login);
721 case 2:
722 pr_err("Security negotiation"
723 " failed.\n");
724 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
725 ISCSI_LOGIN_STATUS_AUTH_FAILED);
726 return -1;
727 default:
728 pr_err("Received unknown error %d from LIO"
729 " Authentication\n", authret);
730 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
731 ISCSI_LOGIN_STATUS_TARGET_ERROR);
732 return -1;
733 }
734
735 return 0;
736 }
737
738 static int iscsi_target_handle_csg_zero(
739 struct iscsi_conn *conn,
740 struct iscsi_login *login)
741 {
742 int ret;
743 u32 payload_length;
744 struct iscsi_param *param;
745 struct iscsi_login_req *login_req;
746 struct iscsi_login_rsp *login_rsp;
747
748 login_req = (struct iscsi_login_req *) login->req;
749 login_rsp = (struct iscsi_login_rsp *) login->rsp;
750 payload_length = ntoh24(login_req->dlength);
751
752 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
753 if (!param)
754 return -1;
755
756 ret = iscsi_decode_text_input(
757 PHASE_SECURITY|PHASE_DECLARATIVE,
758 SENDER_INITIATOR|SENDER_RECEIVER,
759 login->req_buf,
760 payload_length,
761 conn);
762 if (ret < 0)
763 return -1;
764
765 if (ret > 0) {
766 if (login->auth_complete) {
767 pr_err("Initiator has already been"
768 " successfully authenticated, but is still"
769 " sending %s keys.\n", param->value);
770 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
771 ISCSI_LOGIN_STATUS_INIT_ERR);
772 return -1;
773 }
774
775 goto do_auth;
776 }
777
778 if (login->first_request)
779 if (iscsi_target_check_first_request(conn, login) < 0)
780 return -1;
781
782 ret = iscsi_encode_text_output(
783 PHASE_SECURITY|PHASE_DECLARATIVE,
784 SENDER_TARGET,
785 login->rsp_buf,
786 &login->rsp_length,
787 conn->param_list);
788 if (ret < 0)
789 return -1;
790
791 if (!iscsi_check_negotiated_keys(conn->param_list)) {
792 if (conn->tpg->tpg_attrib.authentication &&
793 !strncmp(param->value, NONE, 4)) {
794 pr_err("Initiator sent AuthMethod=None but"
795 " Target is enforcing iSCSI Authentication,"
796 " login failed.\n");
797 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
798 ISCSI_LOGIN_STATUS_AUTH_FAILED);
799 return -1;
800 }
801
802 if (conn->tpg->tpg_attrib.authentication &&
803 !login->auth_complete)
804 return 0;
805
806 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
807 return 0;
808
809 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
810 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
811 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
812 ISCSI_FLAG_LOGIN_TRANSIT;
813 login->current_stage = 1;
814 }
815 }
816
817 return 0;
818 do_auth:
819 return iscsi_target_do_authentication(conn, login);
820 }
821
822 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
823 {
824 int ret;
825 u32 payload_length;
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 ret = iscsi_decode_text_input(
834 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
835 SENDER_INITIATOR|SENDER_RECEIVER,
836 login->req_buf,
837 payload_length,
838 conn);
839 if (ret < 0) {
840 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
841 ISCSI_LOGIN_STATUS_INIT_ERR);
842 return -1;
843 }
844
845 if (login->first_request)
846 if (iscsi_target_check_first_request(conn, login) < 0)
847 return -1;
848
849 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
850 return -1;
851
852 ret = iscsi_encode_text_output(
853 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
854 SENDER_TARGET,
855 login->rsp_buf,
856 &login->rsp_length,
857 conn->param_list);
858 if (ret < 0) {
859 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
860 ISCSI_LOGIN_STATUS_INIT_ERR);
861 return -1;
862 }
863
864 if (!login->auth_complete &&
865 conn->tpg->tpg_attrib.authentication) {
866 pr_err("Initiator is requesting CSG: 1, has not been"
867 " successfully authenticated, and the Target is"
868 " enforcing iSCSI Authentication, login failed.\n");
869 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
870 ISCSI_LOGIN_STATUS_AUTH_FAILED);
871 return -1;
872 }
873
874 if (!iscsi_check_negotiated_keys(conn->param_list))
875 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
876 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
877 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
878 ISCSI_FLAG_LOGIN_TRANSIT;
879
880 return 0;
881 }
882
883 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
884 {
885 int pdu_count = 0;
886 struct iscsi_login_req *login_req;
887 struct iscsi_login_rsp *login_rsp;
888
889 login_req = (struct iscsi_login_req *) login->req;
890 login_rsp = (struct iscsi_login_rsp *) login->rsp;
891
892 while (1) {
893 if (++pdu_count > MAX_LOGIN_PDUS) {
894 pr_err("MAX_LOGIN_PDUS count reached.\n");
895 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
896 ISCSI_LOGIN_STATUS_TARGET_ERROR);
897 return -1;
898 }
899
900 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
901 case 0:
902 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
903 if (iscsi_target_handle_csg_zero(conn, login) < 0)
904 return -1;
905 break;
906 case 1:
907 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
908 if (iscsi_target_handle_csg_one(conn, login) < 0)
909 return -1;
910 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
911 login->tsih = conn->sess->tsih;
912 login->login_complete = 1;
913 iscsi_target_restore_sock_callbacks(conn);
914 if (iscsi_target_do_tx_login_io(conn,
915 login) < 0)
916 return -1;
917 return 1;
918 }
919 break;
920 default:
921 pr_err("Illegal CSG: %d received from"
922 " Initiator, protocol error.\n",
923 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
924 break;
925 }
926
927 if (iscsi_target_do_tx_login_io(conn, login) < 0)
928 return -1;
929
930 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
931 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
932 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
933 }
934 break;
935 }
936
937 if (conn->sock) {
938 struct sock *sk = conn->sock->sk;
939 bool state;
940
941 read_lock_bh(&sk->sk_callback_lock);
942 state = iscsi_target_sk_state_check(sk);
943 read_unlock_bh(&sk->sk_callback_lock);
944
945 if (!state) {
946 pr_debug("iscsi_target_do_login() failed state for"
947 " conn: %p\n", conn);
948 return -1;
949 }
950 }
951
952 return 0;
953 }
954
955 static void iscsi_initiatorname_tolower(
956 char *param_buf)
957 {
958 char *c;
959 u32 iqn_size = strlen(param_buf), i;
960
961 for (i = 0; i < iqn_size; i++) {
962 c = &param_buf[i];
963 if (!isupper(*c))
964 continue;
965
966 *c = tolower(*c);
967 }
968 }
969
970 /*
971 * Processes the first Login Request..
972 */
973 int iscsi_target_locate_portal(
974 struct iscsi_np *np,
975 struct iscsi_conn *conn,
976 struct iscsi_login *login)
977 {
978 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
979 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
980 struct iscsi_session *sess = conn->sess;
981 struct iscsi_tiqn *tiqn;
982 struct iscsi_tpg_np *tpg_np = NULL;
983 struct iscsi_login_req *login_req;
984 struct se_node_acl *se_nacl;
985 u32 payload_length, queue_depth = 0;
986 int sessiontype = 0, ret = 0, tag_num, tag_size;
987
988 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
989 INIT_DELAYED_WORK(&conn->login_cleanup_work, iscsi_target_do_cleanup);
990 iscsi_target_set_sock_callbacks(conn);
991
992 login->np = np;
993
994 login_req = (struct iscsi_login_req *) login->req;
995 payload_length = ntoh24(login_req->dlength);
996
997 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
998 if (!tmpbuf) {
999 pr_err("Unable to allocate memory for tmpbuf.\n");
1000 return -1;
1001 }
1002
1003 memcpy(tmpbuf, login->req_buf, payload_length);
1004 tmpbuf[payload_length] = '\0';
1005 start = tmpbuf;
1006 end = (start + payload_length);
1007
1008 /*
1009 * Locate the initial keys expected from the Initiator node in
1010 * the first login request in order to progress with the login phase.
1011 */
1012 while (start < end) {
1013 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1014 ret = -1;
1015 goto out;
1016 }
1017
1018 if (!strncmp(key, "InitiatorName", 13))
1019 i_buf = value;
1020 else if (!strncmp(key, "SessionType", 11))
1021 s_buf = value;
1022 else if (!strncmp(key, "TargetName", 10))
1023 t_buf = value;
1024
1025 start += strlen(key) + strlen(value) + 2;
1026 }
1027 /*
1028 * See 5.3. Login Phase.
1029 */
1030 if (!i_buf) {
1031 pr_err("InitiatorName key not received"
1032 " in first login request.\n");
1033 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1034 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1035 ret = -1;
1036 goto out;
1037 }
1038 /*
1039 * Convert the incoming InitiatorName to lowercase following
1040 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1041 * are NOT case sensitive.
1042 */
1043 iscsi_initiatorname_tolower(i_buf);
1044
1045 if (!s_buf) {
1046 if (!login->leading_connection)
1047 goto get_target;
1048
1049 pr_err("SessionType key not received"
1050 " in first login request.\n");
1051 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1052 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1053 ret = -1;
1054 goto out;
1055 }
1056
1057 /*
1058 * Use default portal group for discovery sessions.
1059 */
1060 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1061 if (!sessiontype) {
1062 conn->tpg = iscsit_global->discovery_tpg;
1063 if (!login->leading_connection)
1064 goto get_target;
1065
1066 sess->sess_ops->SessionType = 1;
1067 /*
1068 * Setup crc32c modules from libcrypto
1069 */
1070 if (iscsi_login_setup_crypto(conn) < 0) {
1071 pr_err("iscsi_login_setup_crypto() failed\n");
1072 ret = -1;
1073 goto out;
1074 }
1075 /*
1076 * Serialize access across the discovery struct iscsi_portal_group to
1077 * process login attempt.
1078 */
1079 if (iscsit_access_np(np, conn->tpg) < 0) {
1080 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1081 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1082 ret = -1;
1083 goto out;
1084 }
1085 ret = 0;
1086 goto alloc_tags;
1087 }
1088
1089 get_target:
1090 if (!t_buf) {
1091 pr_err("TargetName key not received"
1092 " in first login request while"
1093 " SessionType=Normal.\n");
1094 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1095 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1096 ret = -1;
1097 goto out;
1098 }
1099
1100 /*
1101 * Locate Target IQN from Storage Node.
1102 */
1103 tiqn = iscsit_get_tiqn_for_login(t_buf);
1104 if (!tiqn) {
1105 pr_err("Unable to locate Target IQN: %s in"
1106 " Storage Node\n", t_buf);
1107 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1108 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1109 ret = -1;
1110 goto out;
1111 }
1112 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1113
1114 /*
1115 * Locate Target Portal Group from Storage Node.
1116 */
1117 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1118 if (!conn->tpg) {
1119 pr_err("Unable to locate Target Portal Group"
1120 " on %s\n", tiqn->tiqn);
1121 iscsit_put_tiqn_for_login(tiqn);
1122 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1123 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1124 ret = -1;
1125 goto out;
1126 }
1127 conn->tpg_np = tpg_np;
1128 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1129 /*
1130 * Setup crc32c modules from libcrypto
1131 */
1132 if (iscsi_login_setup_crypto(conn) < 0) {
1133 pr_err("iscsi_login_setup_crypto() failed\n");
1134 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1135 iscsit_put_tiqn_for_login(tiqn);
1136 conn->tpg = NULL;
1137 ret = -1;
1138 goto out;
1139 }
1140 /*
1141 * Serialize access across the struct iscsi_portal_group to
1142 * process login attempt.
1143 */
1144 if (iscsit_access_np(np, conn->tpg) < 0) {
1145 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1146 iscsit_put_tiqn_for_login(tiqn);
1147 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1148 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1149 conn->tpg = NULL;
1150 ret = -1;
1151 goto out;
1152 }
1153
1154 /*
1155 * conn->sess->node_acl will be set when the referenced
1156 * struct iscsi_session is located from received ISID+TSIH in
1157 * iscsi_login_non_zero_tsih_s2().
1158 */
1159 if (!login->leading_connection) {
1160 ret = 0;
1161 goto out;
1162 }
1163
1164 /*
1165 * This value is required in iscsi_login_zero_tsih_s2()
1166 */
1167 sess->sess_ops->SessionType = 0;
1168
1169 /*
1170 * Locate incoming Initiator IQN reference from Storage Node.
1171 */
1172 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1173 &conn->tpg->tpg_se_tpg, i_buf);
1174 if (!sess->se_sess->se_node_acl) {
1175 pr_err("iSCSI Initiator Node: %s is not authorized to"
1176 " access iSCSI target portal group: %hu.\n",
1177 i_buf, conn->tpg->tpgt);
1178 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1179 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1180 ret = -1;
1181 goto out;
1182 }
1183 se_nacl = sess->se_sess->se_node_acl;
1184 queue_depth = se_nacl->queue_depth;
1185 /*
1186 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1187 * depth for non immediate commands, plus extra tags for immediate
1188 * commands.
1189 *
1190 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1191 * in per-cpu-ida tag allocation logic + small queue_depth.
1192 */
1193 alloc_tags:
1194 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1195 tag_num += ISCSIT_EXTRA_TAGS;
1196 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1197
1198 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1199 if (ret < 0) {
1200 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1201 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1202 ret = -1;
1203 }
1204 out:
1205 kfree(tmpbuf);
1206 return ret;
1207 }
1208
1209 int iscsi_target_start_negotiation(
1210 struct iscsi_login *login,
1211 struct iscsi_conn *conn)
1212 {
1213 int ret;
1214
1215 ret = iscsi_target_do_login(conn, login);
1216 if (!ret) {
1217 if (conn->sock) {
1218 struct sock *sk = conn->sock->sk;
1219
1220 write_lock_bh(&sk->sk_callback_lock);
1221 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1222 write_unlock_bh(&sk->sk_callback_lock);
1223 }
1224 } else if (ret < 0) {
1225 cancel_delayed_work_sync(&conn->login_work);
1226 cancel_delayed_work_sync(&conn->login_cleanup_work);
1227 iscsi_target_restore_sock_callbacks(conn);
1228 iscsi_remove_failed_auth_entry(conn);
1229 }
1230 if (ret != 0)
1231 iscsi_target_nego_release(conn);
1232
1233 return ret;
1234 }
1235
1236 void iscsi_target_nego_release(struct iscsi_conn *conn)
1237 {
1238 struct iscsi_login *login = conn->conn_login;
1239
1240 if (!login)
1241 return;
1242
1243 kfree(login->req_buf);
1244 kfree(login->rsp_buf);
1245 kfree(login);
1246
1247 conn->conn_login = NULL;
1248 }
Linux kernel - Deliverables
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