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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 <target/iscsi/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
37void 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
46static 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
59int 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;
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
102static 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
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
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
177static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
178{
179 kfree(conn->auth_protocol);
180}
181
182int 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
272static 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
308
309
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
340static 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
378static void iscsi_target_sk_data_ready(struct sock *sk)
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) {
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
414static void iscsi_target_sk_state_change(struct sock *);
415
416static 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
438static 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
462static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
463
464static 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
474static 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
484static 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
497static 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) {
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) {
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
585static 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
607static 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
660
661
662
663static 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
679static 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
738static 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 } else if (!payload_length) {
777 pr_err("Initiator sent zero length security payload,"
778 " login failed\n");
779 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
780 ISCSI_LOGIN_STATUS_AUTH_FAILED);
781 return -1;
782 }
783
784 if (login->first_request)
785 if (iscsi_target_check_first_request(conn, login) < 0)
786 return -1;
787
788 ret = iscsi_encode_text_output(
789 PHASE_SECURITY|PHASE_DECLARATIVE,
790 SENDER_TARGET,
791 login->rsp_buf,
792 &login->rsp_length,
793 conn->param_list);
794 if (ret < 0)
795 return -1;
796
797 if (!iscsi_check_negotiated_keys(conn->param_list)) {
798 if (conn->tpg->tpg_attrib.authentication &&
799 !strncmp(param->value, NONE, 4)) {
800 pr_err("Initiator sent AuthMethod=None but"
801 " Target is enforcing iSCSI Authentication,"
802 " login failed.\n");
803 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
804 ISCSI_LOGIN_STATUS_AUTH_FAILED);
805 return -1;
806 }
807
808 if (conn->tpg->tpg_attrib.authentication &&
809 !login->auth_complete)
810 return 0;
811
812 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
813 return 0;
814
815 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
816 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
817 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
818 ISCSI_FLAG_LOGIN_TRANSIT;
819 login->current_stage = 1;
820 }
821 }
822
823 return 0;
824do_auth:
825 return iscsi_target_do_authentication(conn, login);
826}
827
828static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
829{
830 int ret;
831 u32 payload_length;
832 struct iscsi_login_req *login_req;
833 struct iscsi_login_rsp *login_rsp;
834
835 login_req = (struct iscsi_login_req *) login->req;
836 login_rsp = (struct iscsi_login_rsp *) login->rsp;
837 payload_length = ntoh24(login_req->dlength);
838
839 ret = iscsi_decode_text_input(
840 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
841 SENDER_INITIATOR|SENDER_RECEIVER,
842 login->req_buf,
843 payload_length,
844 conn);
845 if (ret < 0) {
846 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
847 ISCSI_LOGIN_STATUS_INIT_ERR);
848 return -1;
849 }
850
851 if (login->first_request)
852 if (iscsi_target_check_first_request(conn, login) < 0)
853 return -1;
854
855 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
856 return -1;
857
858 ret = iscsi_encode_text_output(
859 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
860 SENDER_TARGET,
861 login->rsp_buf,
862 &login->rsp_length,
863 conn->param_list);
864 if (ret < 0) {
865 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
866 ISCSI_LOGIN_STATUS_INIT_ERR);
867 return -1;
868 }
869
870 if (!login->auth_complete &&
871 conn->tpg->tpg_attrib.authentication) {
872 pr_err("Initiator is requesting CSG: 1, has not been"
873 " successfully authenticated, and the Target is"
874 " enforcing iSCSI Authentication, login failed.\n");
875 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
876 ISCSI_LOGIN_STATUS_AUTH_FAILED);
877 return -1;
878 }
879
880 if (!iscsi_check_negotiated_keys(conn->param_list))
881 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
882 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
883 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
884 ISCSI_FLAG_LOGIN_TRANSIT;
885
886 return 0;
887}
888
889static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
890{
891 int pdu_count = 0;
892 struct iscsi_login_req *login_req;
893 struct iscsi_login_rsp *login_rsp;
894
895 login_req = (struct iscsi_login_req *) login->req;
896 login_rsp = (struct iscsi_login_rsp *) login->rsp;
897
898 while (1) {
899 if (++pdu_count > MAX_LOGIN_PDUS) {
900 pr_err("MAX_LOGIN_PDUS count reached.\n");
901 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
902 ISCSI_LOGIN_STATUS_TARGET_ERROR);
903 return -1;
904 }
905
906 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
907 case 0:
908 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
909 if (iscsi_target_handle_csg_zero(conn, login) < 0)
910 return -1;
911 break;
912 case 1:
913 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
914 if (iscsi_target_handle_csg_one(conn, login) < 0)
915 return -1;
916 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
917 login->tsih = conn->sess->tsih;
918 login->login_complete = 1;
919 iscsi_target_restore_sock_callbacks(conn);
920 if (iscsi_target_do_tx_login_io(conn,
921 login) < 0)
922 return -1;
923 return 1;
924 }
925 break;
926 default:
927 pr_err("Illegal CSG: %d received from"
928 " Initiator, protocol error.\n",
929 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
930 break;
931 }
932
933 if (iscsi_target_do_tx_login_io(conn, login) < 0)
934 return -1;
935
936 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
937 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
938 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
939 }
940 break;
941 }
942
943 if (conn->sock) {
944 struct sock *sk = conn->sock->sk;
945 bool state;
946
947 read_lock_bh(&sk->sk_callback_lock);
948 state = iscsi_target_sk_state_check(sk);
949 read_unlock_bh(&sk->sk_callback_lock);
950
951 if (!state) {
952 pr_debug("iscsi_target_do_login() failed state for"
953 " conn: %p\n", conn);
954 return -1;
955 }
956 }
957
958 return 0;
959}
960
961static void iscsi_initiatorname_tolower(
962 char *param_buf)
963{
964 char *c;
965 u32 iqn_size = strlen(param_buf), i;
966
967 for (i = 0; i < iqn_size; i++) {
968 c = ¶m_buf[i];
969 if (!isupper(*c))
970 continue;
971
972 *c = tolower(*c);
973 }
974}
975
976
977
978
979int iscsi_target_locate_portal(
980 struct iscsi_np *np,
981 struct iscsi_conn *conn,
982 struct iscsi_login *login)
983{
984 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
985 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
986 struct iscsi_session *sess = conn->sess;
987 struct iscsi_tiqn *tiqn;
988 struct iscsi_tpg_np *tpg_np = NULL;
989 struct iscsi_login_req *login_req;
990 struct se_node_acl *se_nacl;
991 u32 payload_length, queue_depth = 0;
992 int sessiontype = 0, ret = 0, tag_num, tag_size;
993
994 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
995 INIT_DELAYED_WORK(&conn->login_cleanup_work, iscsi_target_do_cleanup);
996 iscsi_target_set_sock_callbacks(conn);
997
998 login->np = np;
999
1000 login_req = (struct iscsi_login_req *) login->req;
1001 payload_length = ntoh24(login_req->dlength);
1002
1003 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1004 if (!tmpbuf) {
1005 pr_err("Unable to allocate memory for tmpbuf.\n");
1006 return -1;
1007 }
1008
1009 memcpy(tmpbuf, login->req_buf, payload_length);
1010 tmpbuf[payload_length] = '\0';
1011 start = tmpbuf;
1012 end = (start + payload_length);
1013
1014
1015
1016
1017
1018 while (start < end) {
1019 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1020 ret = -1;
1021 goto out;
1022 }
1023
1024 if (!strncmp(key, "InitiatorName", 13))
1025 i_buf = value;
1026 else if (!strncmp(key, "SessionType", 11))
1027 s_buf = value;
1028 else if (!strncmp(key, "TargetName", 10))
1029 t_buf = value;
1030
1031 start += strlen(key) + strlen(value) + 2;
1032 }
1033
1034
1035
1036 if (!i_buf) {
1037 pr_err("InitiatorName key not received"
1038 " in first login request.\n");
1039 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1040 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1041 ret = -1;
1042 goto out;
1043 }
1044
1045
1046
1047
1048
1049 iscsi_initiatorname_tolower(i_buf);
1050
1051 if (!s_buf) {
1052 if (!login->leading_connection)
1053 goto get_target;
1054
1055 pr_err("SessionType key not received"
1056 " in first login request.\n");
1057 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1058 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1059 ret = -1;
1060 goto out;
1061 }
1062
1063
1064
1065
1066 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1067 if (!sessiontype) {
1068 conn->tpg = iscsit_global->discovery_tpg;
1069 if (!login->leading_connection)
1070 goto get_target;
1071
1072 sess->sess_ops->SessionType = 1;
1073
1074
1075
1076 if (iscsi_login_setup_crypto(conn) < 0) {
1077 pr_err("iscsi_login_setup_crypto() failed\n");
1078 ret = -1;
1079 goto out;
1080 }
1081
1082
1083
1084
1085 if (iscsit_access_np(np, conn->tpg) < 0) {
1086 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1087 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1088 ret = -1;
1089 goto out;
1090 }
1091 ret = 0;
1092 goto alloc_tags;
1093 }
1094
1095get_target:
1096 if (!t_buf) {
1097 pr_err("TargetName key not received"
1098 " in first login request while"
1099 " SessionType=Normal.\n");
1100 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1101 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1102 ret = -1;
1103 goto out;
1104 }
1105
1106
1107
1108
1109 tiqn = iscsit_get_tiqn_for_login(t_buf);
1110 if (!tiqn) {
1111 pr_err("Unable to locate Target IQN: %s in"
1112 " Storage Node\n", t_buf);
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 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1119
1120
1121
1122
1123 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1124 if (!conn->tpg) {
1125 pr_err("Unable to locate Target Portal Group"
1126 " on %s\n", tiqn->tiqn);
1127 iscsit_put_tiqn_for_login(tiqn);
1128 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1129 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1130 ret = -1;
1131 goto out;
1132 }
1133 conn->tpg_np = tpg_np;
1134 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1135
1136
1137
1138 if (iscsi_login_setup_crypto(conn) < 0) {
1139 pr_err("iscsi_login_setup_crypto() failed\n");
1140 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1141 iscsit_put_tiqn_for_login(tiqn);
1142 conn->tpg = NULL;
1143 ret = -1;
1144 goto out;
1145 }
1146
1147
1148
1149
1150 if (iscsit_access_np(np, conn->tpg) < 0) {
1151 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1152 iscsit_put_tiqn_for_login(tiqn);
1153 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1154 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1155 conn->tpg = NULL;
1156 ret = -1;
1157 goto out;
1158 }
1159
1160
1161
1162
1163
1164
1165 if (!login->leading_connection) {
1166 ret = 0;
1167 goto out;
1168 }
1169
1170
1171
1172
1173 sess->sess_ops->SessionType = 0;
1174
1175
1176
1177
1178 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1179 &conn->tpg->tpg_se_tpg, i_buf);
1180 if (!sess->se_sess->se_node_acl) {
1181 pr_err("iSCSI Initiator Node: %s is not authorized to"
1182 " access iSCSI target portal group: %hu.\n",
1183 i_buf, conn->tpg->tpgt);
1184 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1185 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1186 ret = -1;
1187 goto out;
1188 }
1189 se_nacl = sess->se_sess->se_node_acl;
1190 queue_depth = se_nacl->queue_depth;
1191
1192
1193
1194
1195
1196
1197
1198
1199alloc_tags:
1200 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1201 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1202 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1203
1204 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1205 if (ret < 0) {
1206 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1207 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1208 ret = -1;
1209 }
1210out:
1211 kfree(tmpbuf);
1212 return ret;
1213}
1214
1215int iscsi_target_start_negotiation(
1216 struct iscsi_login *login,
1217 struct iscsi_conn *conn)
1218{
1219 int ret;
1220
1221 ret = iscsi_target_do_login(conn, login);
1222 if (!ret) {
1223 if (conn->sock) {
1224 struct sock *sk = conn->sock->sk;
1225
1226 write_lock_bh(&sk->sk_callback_lock);
1227 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1228 write_unlock_bh(&sk->sk_callback_lock);
1229 }
1230 } else if (ret < 0) {
1231 cancel_delayed_work_sync(&conn->login_work);
1232 cancel_delayed_work_sync(&conn->login_cleanup_work);
1233 iscsi_target_restore_sock_callbacks(conn);
1234 iscsi_remove_failed_auth_entry(conn);
1235 }
1236 if (ret != 0)
1237 iscsi_target_nego_release(conn);
1238
1239 return ret;
1240}
1241
1242void iscsi_target_nego_release(struct iscsi_conn *conn)
1243{
1244 struct iscsi_login *login = conn->conn_login;
1245
1246 if (!login)
1247 return;
1248
1249 kfree(login->req_buf);
1250 kfree(login->rsp_buf);
1251 kfree(login);
1252
1253 conn->conn_login = NULL;
1254}
1255
