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11#include <linux/ctype.h>
12#include <linux/kthread.h>
13#include <linux/slab.h>
14#include <linux/sched/signal.h>
15#include <net/sock.h>
16#include <scsi/iscsi_proto.h>
17#include <target/target_core_base.h>
18#include <target/target_core_fabric.h>
19#include <target/iscsi/iscsi_transport.h>
20
21#include <target/iscsi/iscsi_target_core.h>
22#include "iscsi_target_parameters.h"
23#include "iscsi_target_login.h"
24#include "iscsi_target_nego.h"
25#include "iscsi_target_tpg.h"
26#include "iscsi_target_util.h"
27#include "iscsi_target.h"
28#include "iscsi_target_auth.h"
29
30#define MAX_LOGIN_PDUS 7
31
32void convert_null_to_semi(char *buf, int len)
33{
34 int i;
35
36 for (i = 0; i < len; i++)
37 if (buf[i] == '\0')
38 buf[i] = ';';
39}
40
41static int strlen_semi(char *buf)
42{
43 int i = 0;
44
45 while (buf[i] != '\0') {
46 if (buf[i] == ';')
47 return i;
48 i++;
49 }
50
51 return -1;
52}
53
54int extract_param(
55 const char *in_buf,
56 const char *pattern,
57 unsigned int max_length,
58 char *out_buf,
59 unsigned char *type)
60{
61 char *ptr;
62 int len;
63
64 if (!in_buf || !pattern || !out_buf || !type)
65 return -1;
66
67 ptr = strstr(in_buf, pattern);
68 if (!ptr)
69 return -1;
70
71 ptr = strstr(ptr, "=");
72 if (!ptr)
73 return -1;
74
75 ptr += 1;
76 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
77 ptr += 2;
78 *type = HEX;
79 } else
80 *type = DECIMAL;
81
82 len = strlen_semi(ptr);
83 if (len < 0)
84 return -1;
85
86 if (len >= max_length) {
87 pr_err("Length of input: %d exceeds max_length:"
88 " %d\n", len, max_length);
89 return -1;
90 }
91 memcpy(out_buf, ptr, len);
92 out_buf[len] = '\0';
93
94 return 0;
95}
96
97static u32 iscsi_handle_authentication(
98 struct iscsi_conn *conn,
99 char *in_buf,
100 char *out_buf,
101 int in_length,
102 int *out_length,
103 unsigned char *authtype)
104{
105 struct iscsi_session *sess = conn->sess;
106 struct iscsi_node_auth *auth;
107 struct iscsi_node_acl *iscsi_nacl;
108 struct iscsi_portal_group *iscsi_tpg;
109 struct se_node_acl *se_nacl;
110
111 if (!sess->sess_ops->SessionType) {
112
113
114
115 se_nacl = conn->sess->se_sess->se_node_acl;
116 if (!se_nacl) {
117 pr_err("Unable to locate struct se_node_acl for"
118 " CHAP auth\n");
119 return -1;
120 }
121
122 if (se_nacl->dynamic_node_acl) {
123 iscsi_tpg = container_of(se_nacl->se_tpg,
124 struct iscsi_portal_group, tpg_se_tpg);
125
126 auth = &iscsi_tpg->tpg_demo_auth;
127 } else {
128 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
129 se_node_acl);
130
131 auth = &iscsi_nacl->node_auth;
132 }
133 } else {
134
135
136
137 auth = &iscsit_global->discovery_acl.node_auth;
138 }
139
140 if (strstr("CHAP", authtype))
141 strcpy(conn->sess->auth_type, "CHAP");
142 else
143 strcpy(conn->sess->auth_type, NONE);
144
145 if (strstr("None", authtype))
146 return 1;
147 else if (strstr("CHAP", authtype))
148 return chap_main_loop(conn, auth, in_buf, out_buf,
149 &in_length, out_length);
150
151 return 2;
152}
153
154static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
155{
156 kfree(conn->auth_protocol);
157}
158
159int iscsi_target_check_login_request(
160 struct iscsi_conn *conn,
161 struct iscsi_login *login)
162{
163 int req_csg, req_nsg;
164 u32 payload_length;
165 struct iscsi_login_req *login_req;
166
167 login_req = (struct iscsi_login_req *) login->req;
168 payload_length = ntoh24(login_req->dlength);
169
170 switch (login_req->opcode & ISCSI_OPCODE_MASK) {
171 case ISCSI_OP_LOGIN:
172 break;
173 default:
174 pr_err("Received unknown opcode 0x%02x.\n",
175 login_req->opcode & ISCSI_OPCODE_MASK);
176 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
177 ISCSI_LOGIN_STATUS_INIT_ERR);
178 return -1;
179 }
180
181 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
182 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
183 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
184 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
185 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
186 ISCSI_LOGIN_STATUS_INIT_ERR);
187 return -1;
188 }
189
190 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
191 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
192
193 if (req_csg != login->current_stage) {
194 pr_err("Initiator unexpectedly changed login stage"
195 " from %d to %d, login failed.\n", login->current_stage,
196 req_csg);
197 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
198 ISCSI_LOGIN_STATUS_INIT_ERR);
199 return -1;
200 }
201
202 if ((req_nsg == 2) || (req_csg >= 2) ||
203 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
204 (req_nsg <= req_csg))) {
205 pr_err("Illegal login_req->flags Combination, CSG: %d,"
206 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
207 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
208 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
209 ISCSI_LOGIN_STATUS_INIT_ERR);
210 return -1;
211 }
212
213 if ((login_req->max_version != login->version_max) ||
214 (login_req->min_version != login->version_min)) {
215 pr_err("Login request changed Version Max/Nin"
216 " unexpectedly to 0x%02x/0x%02x, protocol error\n",
217 login_req->max_version, login_req->min_version);
218 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
219 ISCSI_LOGIN_STATUS_INIT_ERR);
220 return -1;
221 }
222
223 if (memcmp(login_req->isid, login->isid, 6) != 0) {
224 pr_err("Login request changed ISID unexpectedly,"
225 " protocol error.\n");
226 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
227 ISCSI_LOGIN_STATUS_INIT_ERR);
228 return -1;
229 }
230
231 if (login_req->itt != login->init_task_tag) {
232 pr_err("Login request changed ITT unexpectedly to"
233 " 0x%08x, protocol error.\n", login_req->itt);
234 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
235 ISCSI_LOGIN_STATUS_INIT_ERR);
236 return -1;
237 }
238
239 if (payload_length > MAX_KEY_VALUE_PAIRS) {
240 pr_err("Login request payload exceeds default"
241 " MaxRecvDataSegmentLength: %u, protocol error.\n",
242 MAX_KEY_VALUE_PAIRS);
243 return -1;
244 }
245
246 return 0;
247}
248EXPORT_SYMBOL(iscsi_target_check_login_request);
249
250static int iscsi_target_check_first_request(
251 struct iscsi_conn *conn,
252 struct iscsi_login *login)
253{
254 struct iscsi_param *param = NULL;
255 struct se_node_acl *se_nacl;
256
257 login->first_request = 0;
258
259 list_for_each_entry(param, &conn->param_list->param_list, p_list) {
260 if (!strncmp(param->name, SESSIONTYPE, 11)) {
261 if (!IS_PSTATE_ACCEPTOR(param)) {
262 pr_err("SessionType key not received"
263 " in first login request.\n");
264 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
265 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
266 return -1;
267 }
268 if (!strncmp(param->value, DISCOVERY, 9))
269 return 0;
270 }
271
272 if (!strncmp(param->name, INITIATORNAME, 13)) {
273 if (!IS_PSTATE_ACCEPTOR(param)) {
274 if (!login->leading_connection)
275 continue;
276
277 pr_err("InitiatorName key not received"
278 " in first login request.\n");
279 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
280 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
281 return -1;
282 }
283
284
285
286
287
288
289 if (!login->leading_connection) {
290 se_nacl = conn->sess->se_sess->se_node_acl;
291 if (!se_nacl) {
292 pr_err("Unable to locate"
293 " struct se_node_acl\n");
294 iscsit_tx_login_rsp(conn,
295 ISCSI_STATUS_CLS_INITIATOR_ERR,
296 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
297 return -1;
298 }
299
300 if (strcmp(param->value,
301 se_nacl->initiatorname)) {
302 pr_err("Incorrect"
303 " InitiatorName: %s for this"
304 " iSCSI Initiator Node.\n",
305 param->value);
306 iscsit_tx_login_rsp(conn,
307 ISCSI_STATUS_CLS_INITIATOR_ERR,
308 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
309 return -1;
310 }
311 }
312 }
313 }
314
315 return 0;
316}
317
318static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
319{
320 u32 padding = 0;
321 struct iscsi_login_rsp *login_rsp;
322
323 login_rsp = (struct iscsi_login_rsp *) login->rsp;
324
325 login_rsp->opcode = ISCSI_OP_LOGIN_RSP;
326 hton24(login_rsp->dlength, login->rsp_length);
327 memcpy(login_rsp->isid, login->isid, 6);
328 login_rsp->tsih = cpu_to_be16(login->tsih);
329 login_rsp->itt = login->init_task_tag;
330 login_rsp->statsn = cpu_to_be32(conn->stat_sn++);
331 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
332 login_rsp->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
333
334 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
335 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
336 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
337 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
338 ntohl(login_rsp->statsn), login->rsp_length);
339
340 padding = ((-login->rsp_length) & 3);
341
342
343
344
345
346
347 if (login->login_complete) {
348 int rc = iscsit_start_kthreads(conn);
349 if (rc) {
350 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
351 ISCSI_LOGIN_STATUS_NO_RESOURCES);
352 return -1;
353 }
354 }
355
356 if (conn->conn_transport->iscsit_put_login_tx(conn, login,
357 login->rsp_length + padding) < 0)
358 goto err;
359
360 login->rsp_length = 0;
361
362 return 0;
363
364err:
365 if (login->login_complete) {
366 if (conn->rx_thread && conn->rx_thread_active) {
367 send_sig(SIGINT, conn->rx_thread, 1);
368 complete(&conn->rx_login_comp);
369 kthread_stop(conn->rx_thread);
370 }
371 if (conn->tx_thread && conn->tx_thread_active) {
372 send_sig(SIGINT, conn->tx_thread, 1);
373 kthread_stop(conn->tx_thread);
374 }
375 spin_lock(&iscsit_global->ts_bitmap_lock);
376 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
377 get_order(1));
378 spin_unlock(&iscsit_global->ts_bitmap_lock);
379 }
380 return -1;
381}
382
383static void iscsi_target_sk_data_ready(struct sock *sk)
384{
385 struct iscsi_conn *conn = sk->sk_user_data;
386 bool rc;
387
388 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
389
390 write_lock_bh(&sk->sk_callback_lock);
391 if (!sk->sk_user_data) {
392 write_unlock_bh(&sk->sk_callback_lock);
393 return;
394 }
395 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
396 write_unlock_bh(&sk->sk_callback_lock);
397 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
398 return;
399 }
400 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
401 write_unlock_bh(&sk->sk_callback_lock);
402 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
403 return;
404 }
405 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
406 write_unlock_bh(&sk->sk_callback_lock);
407 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
408 if (iscsi_target_sk_data_ready == conn->orig_data_ready)
409 return;
410 conn->orig_data_ready(sk);
411 return;
412 }
413
414 rc = schedule_delayed_work(&conn->login_work, 0);
415 if (!rc) {
416 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
417 " got false\n");
418 }
419 write_unlock_bh(&sk->sk_callback_lock);
420}
421
422static void iscsi_target_sk_state_change(struct sock *);
423
424static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
425{
426 struct sock *sk;
427
428 if (!conn->sock)
429 return;
430
431 sk = conn->sock->sk;
432 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
433
434 write_lock_bh(&sk->sk_callback_lock);
435 sk->sk_user_data = conn;
436 conn->orig_data_ready = sk->sk_data_ready;
437 conn->orig_state_change = sk->sk_state_change;
438 sk->sk_data_ready = iscsi_target_sk_data_ready;
439 sk->sk_state_change = iscsi_target_sk_state_change;
440 write_unlock_bh(&sk->sk_callback_lock);
441
442 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
443 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
444}
445
446static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
447{
448 struct sock *sk;
449
450 if (!conn->sock)
451 return;
452
453 sk = conn->sock->sk;
454 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
455
456 write_lock_bh(&sk->sk_callback_lock);
457 if (!sk->sk_user_data) {
458 write_unlock_bh(&sk->sk_callback_lock);
459 return;
460 }
461 sk->sk_user_data = NULL;
462 sk->sk_data_ready = conn->orig_data_ready;
463 sk->sk_state_change = conn->orig_state_change;
464 write_unlock_bh(&sk->sk_callback_lock);
465
466 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
467 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
468}
469
470static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
471
472static bool __iscsi_target_sk_check_close(struct sock *sk)
473{
474 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
475 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE,"
476 "returning TRUE\n");
477 return true;
478 }
479 return false;
480}
481
482static bool iscsi_target_sk_check_close(struct iscsi_conn *conn)
483{
484 bool state = false;
485
486 if (conn->sock) {
487 struct sock *sk = conn->sock->sk;
488
489 read_lock_bh(&sk->sk_callback_lock);
490 state = (__iscsi_target_sk_check_close(sk) ||
491 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
492 read_unlock_bh(&sk->sk_callback_lock);
493 }
494 return state;
495}
496
497static bool iscsi_target_sk_check_flag(struct iscsi_conn *conn, unsigned int flag)
498{
499 bool state = false;
500
501 if (conn->sock) {
502 struct sock *sk = conn->sock->sk;
503
504 read_lock_bh(&sk->sk_callback_lock);
505 state = test_bit(flag, &conn->login_flags);
506 read_unlock_bh(&sk->sk_callback_lock);
507 }
508 return state;
509}
510
511static bool iscsi_target_sk_check_and_clear(struct iscsi_conn *conn, unsigned int flag)
512{
513 bool state = false;
514
515 if (conn->sock) {
516 struct sock *sk = conn->sock->sk;
517
518 write_lock_bh(&sk->sk_callback_lock);
519 state = (__iscsi_target_sk_check_close(sk) ||
520 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
521 if (!state)
522 clear_bit(flag, &conn->login_flags);
523 write_unlock_bh(&sk->sk_callback_lock);
524 }
525 return state;
526}
527
528static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
529{
530 bool zero_tsih = login->zero_tsih;
531
532 iscsi_remove_failed_auth_entry(conn);
533 iscsi_target_nego_release(conn);
534 iscsi_target_login_sess_out(conn, zero_tsih, true);
535}
536
537struct conn_timeout {
538 struct timer_list timer;
539 struct iscsi_conn *conn;
540};
541
542static void iscsi_target_login_timeout(struct timer_list *t)
543{
544 struct conn_timeout *timeout = from_timer(timeout, t, timer);
545 struct iscsi_conn *conn = timeout->conn;
546
547 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
548
549 if (conn->login_kworker) {
550 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
551 conn->login_kworker->comm, conn->login_kworker->pid);
552 send_sig(SIGINT, conn->login_kworker, 1);
553 }
554}
555
556static void iscsi_target_do_login_rx(struct work_struct *work)
557{
558 struct iscsi_conn *conn = container_of(work,
559 struct iscsi_conn, login_work.work);
560 struct iscsi_login *login = conn->login;
561 struct iscsi_np *np = login->np;
562 struct iscsi_portal_group *tpg = conn->tpg;
563 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
564 struct conn_timeout timeout;
565 int rc, zero_tsih = login->zero_tsih;
566 bool state;
567
568 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
569 conn, current->comm, current->pid);
570
571
572
573
574
575
576
577
578
579
580 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) {
581 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10));
582 return;
583 }
584
585 spin_lock(&tpg->tpg_state_lock);
586 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
587 spin_unlock(&tpg->tpg_state_lock);
588
589 if (!state) {
590 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
591 goto err;
592 }
593
594 if (iscsi_target_sk_check_close(conn)) {
595 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
596 goto err;
597 }
598
599 conn->login_kworker = current;
600 allow_signal(SIGINT);
601
602 timeout.conn = conn;
603 timer_setup_on_stack(&timeout.timer, iscsi_target_login_timeout, 0);
604 mod_timer(&timeout.timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
605 pr_debug("Starting login timer for %s/%d\n", current->comm, current->pid);
606
607 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
608 del_timer_sync(&timeout.timer);
609 destroy_timer_on_stack(&timeout.timer);
610 flush_signals(current);
611 conn->login_kworker = NULL;
612
613 if (rc < 0)
614 goto err;
615
616 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
617 conn, current->comm, current->pid);
618
619
620
621
622
623
624
625
626
627
628
629
630 if (conn->sock) {
631 struct sock *sk = conn->sock->sk;
632
633 write_lock_bh(&sk->sk_callback_lock);
634 if (!test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags)) {
635 clear_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags);
636 set_bit(LOGIN_FLAGS_WRITE_ACTIVE, &conn->login_flags);
637 }
638 write_unlock_bh(&sk->sk_callback_lock);
639 }
640
641 rc = iscsi_target_do_login(conn, login);
642 if (rc < 0) {
643 goto err;
644 } else if (!rc) {
645 if (iscsi_target_sk_check_and_clear(conn,
646 LOGIN_FLAGS_WRITE_ACTIVE))
647 goto err;
648 } else if (rc == 1) {
649 cancel_delayed_work(&conn->login_work);
650 iscsi_target_nego_release(conn);
651 iscsi_post_login_handler(np, conn, zero_tsih);
652 iscsit_deaccess_np(np, tpg, tpg_np);
653 }
654 return;
655
656err:
657 iscsi_target_restore_sock_callbacks(conn);
658 cancel_delayed_work(&conn->login_work);
659 iscsi_target_login_drop(conn, login);
660 iscsit_deaccess_np(np, tpg, tpg_np);
661}
662
663static void iscsi_target_sk_state_change(struct sock *sk)
664{
665 struct iscsi_conn *conn;
666 void (*orig_state_change)(struct sock *);
667 bool state;
668
669 pr_debug("Entering iscsi_target_sk_state_change\n");
670
671 write_lock_bh(&sk->sk_callback_lock);
672 conn = sk->sk_user_data;
673 if (!conn) {
674 write_unlock_bh(&sk->sk_callback_lock);
675 return;
676 }
677 orig_state_change = conn->orig_state_change;
678
679 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
680 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
681 conn);
682 write_unlock_bh(&sk->sk_callback_lock);
683 orig_state_change(sk);
684 return;
685 }
686 state = __iscsi_target_sk_check_close(sk);
687 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state);
688
689 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags) ||
690 test_bit(LOGIN_FLAGS_WRITE_ACTIVE, &conn->login_flags)) {
691 pr_debug("Got LOGIN_FLAGS_{READ|WRITE}_ACTIVE=1"
692 " sk_state_change conn: %p\n", conn);
693 if (state)
694 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
695 write_unlock_bh(&sk->sk_callback_lock);
696 orig_state_change(sk);
697 return;
698 }
699 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
700 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
701 conn);
702 write_unlock_bh(&sk->sk_callback_lock);
703 orig_state_change(sk);
704 return;
705 }
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721 if (state) {
722 pr_debug("iscsi_target_sk_state_change got failed state\n");
723 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
724 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
725 write_unlock_bh(&sk->sk_callback_lock);
726
727 orig_state_change(sk);
728
729 if (!state)
730 schedule_delayed_work(&conn->login_work, 0);
731 return;
732 }
733 write_unlock_bh(&sk->sk_callback_lock);
734
735 orig_state_change(sk);
736}
737
738
739
740
741
742
743static int iscsi_target_check_for_existing_instances(
744 struct iscsi_conn *conn,
745 struct iscsi_login *login)
746{
747 if (login->checked_for_existing)
748 return 0;
749
750 login->checked_for_existing = 1;
751
752 if (!login->tsih)
753 return iscsi_check_for_session_reinstatement(conn);
754 else
755 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
756 login->initial_exp_statsn);
757}
758
759static int iscsi_target_do_authentication(
760 struct iscsi_conn *conn,
761 struct iscsi_login *login)
762{
763 int authret;
764 u32 payload_length;
765 struct iscsi_param *param;
766 struct iscsi_login_req *login_req;
767 struct iscsi_login_rsp *login_rsp;
768
769 login_req = (struct iscsi_login_req *) login->req;
770 login_rsp = (struct iscsi_login_rsp *) login->rsp;
771 payload_length = ntoh24(login_req->dlength);
772
773 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
774 if (!param)
775 return -1;
776
777 authret = iscsi_handle_authentication(
778 conn,
779 login->req_buf,
780 login->rsp_buf,
781 payload_length,
782 &login->rsp_length,
783 param->value);
784 switch (authret) {
785 case 0:
786 pr_debug("Received OK response"
787 " from LIO Authentication, continuing.\n");
788 break;
789 case 1:
790 pr_debug("iSCSI security negotiation"
791 " completed successfully.\n");
792 login->auth_complete = 1;
793 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
794 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
795 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
796 ISCSI_FLAG_LOGIN_TRANSIT);
797 login->current_stage = 1;
798 }
799 return iscsi_target_check_for_existing_instances(
800 conn, login);
801 case 2:
802 pr_err("Security negotiation"
803 " failed.\n");
804 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
805 ISCSI_LOGIN_STATUS_AUTH_FAILED);
806 return -1;
807 default:
808 pr_err("Received unknown error %d from LIO"
809 " Authentication\n", authret);
810 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
811 ISCSI_LOGIN_STATUS_TARGET_ERROR);
812 return -1;
813 }
814
815 return 0;
816}
817
818static int iscsi_target_handle_csg_zero(
819 struct iscsi_conn *conn,
820 struct iscsi_login *login)
821{
822 int ret;
823 u32 payload_length;
824 struct iscsi_param *param;
825 struct iscsi_login_req *login_req;
826 struct iscsi_login_rsp *login_rsp;
827
828 login_req = (struct iscsi_login_req *) login->req;
829 login_rsp = (struct iscsi_login_rsp *) login->rsp;
830 payload_length = ntoh24(login_req->dlength);
831
832 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
833 if (!param)
834 return -1;
835
836 ret = iscsi_decode_text_input(
837 PHASE_SECURITY|PHASE_DECLARATIVE,
838 SENDER_INITIATOR|SENDER_RECEIVER,
839 login->req_buf,
840 payload_length,
841 conn);
842 if (ret < 0)
843 return -1;
844
845 if (ret > 0) {
846 if (login->auth_complete) {
847 pr_err("Initiator has already been"
848 " successfully authenticated, but is still"
849 " sending %s keys.\n", param->value);
850 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
851 ISCSI_LOGIN_STATUS_INIT_ERR);
852 return -1;
853 }
854
855 goto do_auth;
856 } else if (!payload_length) {
857 pr_err("Initiator sent zero length security payload,"
858 " login failed\n");
859 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
860 ISCSI_LOGIN_STATUS_AUTH_FAILED);
861 return -1;
862 }
863
864 if (login->first_request)
865 if (iscsi_target_check_first_request(conn, login) < 0)
866 return -1;
867
868 ret = iscsi_encode_text_output(
869 PHASE_SECURITY|PHASE_DECLARATIVE,
870 SENDER_TARGET,
871 login->rsp_buf,
872 &login->rsp_length,
873 conn->param_list,
874 conn->tpg->tpg_attrib.login_keys_workaround);
875 if (ret < 0)
876 return -1;
877
878 if (!iscsi_check_negotiated_keys(conn->param_list)) {
879 if (conn->tpg->tpg_attrib.authentication &&
880 !strncmp(param->value, NONE, 4)) {
881 pr_err("Initiator sent AuthMethod=None but"
882 " Target is enforcing iSCSI Authentication,"
883 " login failed.\n");
884 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
885 ISCSI_LOGIN_STATUS_AUTH_FAILED);
886 return -1;
887 }
888
889 if (conn->tpg->tpg_attrib.authentication &&
890 !login->auth_complete)
891 return 0;
892
893 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
894 return 0;
895
896 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
897 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
898 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
899 ISCSI_FLAG_LOGIN_TRANSIT;
900 login->current_stage = 1;
901 }
902 }
903
904 return 0;
905do_auth:
906 return iscsi_target_do_authentication(conn, login);
907}
908
909static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
910{
911 int ret;
912 u32 payload_length;
913 struct iscsi_login_req *login_req;
914 struct iscsi_login_rsp *login_rsp;
915
916 login_req = (struct iscsi_login_req *) login->req;
917 login_rsp = (struct iscsi_login_rsp *) login->rsp;
918 payload_length = ntoh24(login_req->dlength);
919
920 ret = iscsi_decode_text_input(
921 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
922 SENDER_INITIATOR|SENDER_RECEIVER,
923 login->req_buf,
924 payload_length,
925 conn);
926 if (ret < 0) {
927 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
928 ISCSI_LOGIN_STATUS_INIT_ERR);
929 return -1;
930 }
931
932 if (login->first_request)
933 if (iscsi_target_check_first_request(conn, login) < 0)
934 return -1;
935
936 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
937 return -1;
938
939 ret = iscsi_encode_text_output(
940 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
941 SENDER_TARGET,
942 login->rsp_buf,
943 &login->rsp_length,
944 conn->param_list,
945 conn->tpg->tpg_attrib.login_keys_workaround);
946 if (ret < 0) {
947 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
948 ISCSI_LOGIN_STATUS_INIT_ERR);
949 return -1;
950 }
951
952 if (!login->auth_complete &&
953 conn->tpg->tpg_attrib.authentication) {
954 pr_err("Initiator is requesting CSG: 1, has not been"
955 " successfully authenticated, and the Target is"
956 " enforcing iSCSI Authentication, login failed.\n");
957 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
958 ISCSI_LOGIN_STATUS_AUTH_FAILED);
959 return -1;
960 }
961
962 if (!iscsi_check_negotiated_keys(conn->param_list))
963 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
964 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
965 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
966 ISCSI_FLAG_LOGIN_TRANSIT;
967
968 return 0;
969}
970
971static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
972{
973 int pdu_count = 0;
974 struct iscsi_login_req *login_req;
975 struct iscsi_login_rsp *login_rsp;
976
977 login_req = (struct iscsi_login_req *) login->req;
978 login_rsp = (struct iscsi_login_rsp *) login->rsp;
979
980 while (1) {
981 if (++pdu_count > MAX_LOGIN_PDUS) {
982 pr_err("MAX_LOGIN_PDUS count reached.\n");
983 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
984 ISCSI_LOGIN_STATUS_TARGET_ERROR);
985 return -1;
986 }
987
988 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
989 case 0:
990 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
991 if (iscsi_target_handle_csg_zero(conn, login) < 0)
992 return -1;
993 break;
994 case 1:
995 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
996 if (iscsi_target_handle_csg_one(conn, login) < 0)
997 return -1;
998 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
999
1000
1001
1002
1003
1004
1005 if (iscsi_target_sk_check_close(conn))
1006 return -1;
1007
1008 login->tsih = conn->sess->tsih;
1009 login->login_complete = 1;
1010 iscsi_target_restore_sock_callbacks(conn);
1011 if (iscsi_target_do_tx_login_io(conn,
1012 login) < 0)
1013 return -1;
1014 return 1;
1015 }
1016 break;
1017 default:
1018 pr_err("Illegal CSG: %d received from"
1019 " Initiator, protocol error.\n",
1020 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
1021 break;
1022 }
1023
1024 if (iscsi_target_do_tx_login_io(conn, login) < 0)
1025 return -1;
1026
1027 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1028 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
1029 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
1030 }
1031 break;
1032 }
1033
1034 return 0;
1035}
1036
1037static void iscsi_initiatorname_tolower(
1038 char *param_buf)
1039{
1040 char *c;
1041 u32 iqn_size = strlen(param_buf), i;
1042
1043 for (i = 0; i < iqn_size; i++) {
1044 c = ¶m_buf[i];
1045 if (!isupper(*c))
1046 continue;
1047
1048 *c = tolower(*c);
1049 }
1050}
1051
1052
1053
1054
1055int iscsi_target_locate_portal(
1056 struct iscsi_np *np,
1057 struct iscsi_conn *conn,
1058 struct iscsi_login *login)
1059{
1060 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1061 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1062 struct iscsi_session *sess = conn->sess;
1063 struct iscsi_tiqn *tiqn;
1064 struct iscsi_tpg_np *tpg_np = NULL;
1065 struct iscsi_login_req *login_req;
1066 struct se_node_acl *se_nacl;
1067 u32 payload_length, queue_depth = 0;
1068 int sessiontype = 0, ret = 0, tag_num, tag_size;
1069
1070 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1071 iscsi_target_set_sock_callbacks(conn);
1072
1073 login->np = np;
1074
1075 login_req = (struct iscsi_login_req *) login->req;
1076 payload_length = ntoh24(login_req->dlength);
1077
1078 tmpbuf = kmemdup_nul(login->req_buf, payload_length, GFP_KERNEL);
1079 if (!tmpbuf) {
1080 pr_err("Unable to allocate memory for tmpbuf.\n");
1081 return -1;
1082 }
1083
1084 start = tmpbuf;
1085 end = (start + payload_length);
1086
1087
1088
1089
1090
1091 while (start < end) {
1092 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1093 ret = -1;
1094 goto out;
1095 }
1096
1097 if (!strncmp(key, "InitiatorName", 13))
1098 i_buf = value;
1099 else if (!strncmp(key, "SessionType", 11))
1100 s_buf = value;
1101 else if (!strncmp(key, "TargetName", 10))
1102 t_buf = value;
1103
1104 start += strlen(key) + strlen(value) + 2;
1105 }
1106
1107
1108
1109 if (!i_buf) {
1110 pr_err("InitiatorName key not received"
1111 " in first login request.\n");
1112 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1113 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1114 ret = -1;
1115 goto out;
1116 }
1117
1118
1119
1120
1121
1122 iscsi_initiatorname_tolower(i_buf);
1123
1124 if (!s_buf) {
1125 if (!login->leading_connection)
1126 goto get_target;
1127
1128 pr_err("SessionType key not received"
1129 " in first login request.\n");
1130 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1131 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1132 ret = -1;
1133 goto out;
1134 }
1135
1136
1137
1138
1139 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1140 if (!sessiontype) {
1141 conn->tpg = iscsit_global->discovery_tpg;
1142 if (!login->leading_connection)
1143 goto get_target;
1144
1145 sess->sess_ops->SessionType = 1;
1146
1147
1148
1149 if (iscsi_login_setup_crypto(conn) < 0) {
1150 pr_err("iscsi_login_setup_crypto() failed\n");
1151 ret = -1;
1152 goto out;
1153 }
1154
1155
1156
1157
1158 if (iscsit_access_np(np, conn->tpg) < 0) {
1159 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1160 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1161 ret = -1;
1162 goto out;
1163 }
1164 ret = 0;
1165 goto alloc_tags;
1166 }
1167
1168get_target:
1169 if (!t_buf) {
1170 pr_err("TargetName key not received"
1171 " in first login request while"
1172 " SessionType=Normal.\n");
1173 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1174 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1175 ret = -1;
1176 goto out;
1177 }
1178
1179
1180
1181
1182 tiqn = iscsit_get_tiqn_for_login(t_buf);
1183 if (!tiqn) {
1184 pr_err("Unable to locate Target IQN: %s in"
1185 " Storage Node\n", t_buf);
1186 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1187 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1188 ret = -1;
1189 goto out;
1190 }
1191 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1192
1193
1194
1195
1196 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1197 if (!conn->tpg) {
1198 pr_err("Unable to locate Target Portal Group"
1199 " on %s\n", tiqn->tiqn);
1200 iscsit_put_tiqn_for_login(tiqn);
1201 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1202 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1203 ret = -1;
1204 goto out;
1205 }
1206 conn->tpg_np = tpg_np;
1207 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1208
1209
1210
1211 if (iscsi_login_setup_crypto(conn) < 0) {
1212 pr_err("iscsi_login_setup_crypto() failed\n");
1213 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1214 iscsit_put_tiqn_for_login(tiqn);
1215 conn->tpg = NULL;
1216 ret = -1;
1217 goto out;
1218 }
1219
1220
1221
1222
1223 if (iscsit_access_np(np, conn->tpg) < 0) {
1224 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1225 iscsit_put_tiqn_for_login(tiqn);
1226 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1227 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1228 conn->tpg = NULL;
1229 ret = -1;
1230 goto out;
1231 }
1232
1233
1234
1235
1236
1237
1238 if (!login->leading_connection) {
1239 ret = 0;
1240 goto out;
1241 }
1242
1243
1244
1245
1246 sess->sess_ops->SessionType = 0;
1247
1248
1249
1250
1251 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1252 &conn->tpg->tpg_se_tpg, i_buf);
1253 if (!sess->se_sess->se_node_acl) {
1254 pr_err("iSCSI Initiator Node: %s is not authorized to"
1255 " access iSCSI target portal group: %hu.\n",
1256 i_buf, conn->tpg->tpgt);
1257 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1258 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1259 ret = -1;
1260 goto out;
1261 }
1262 se_nacl = sess->se_sess->se_node_acl;
1263 queue_depth = se_nacl->queue_depth;
1264
1265
1266
1267
1268
1269
1270
1271
1272alloc_tags:
1273 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1274 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1275 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1276
1277 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1278 if (ret < 0) {
1279 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1280 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1281 ret = -1;
1282 }
1283out:
1284 kfree(tmpbuf);
1285 return ret;
1286}
1287
1288int iscsi_target_start_negotiation(
1289 struct iscsi_login *login,
1290 struct iscsi_conn *conn)
1291{
1292 int ret;
1293
1294 if (conn->sock) {
1295 struct sock *sk = conn->sock->sk;
1296
1297 write_lock_bh(&sk->sk_callback_lock);
1298 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1299 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
1300 write_unlock_bh(&sk->sk_callback_lock);
1301 }
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311 ret = iscsi_target_do_login(conn, login);
1312 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
1313 ret = -1;
1314
1315 if (ret < 0) {
1316 cancel_delayed_work_sync(&conn->login_work);
1317 iscsi_target_restore_sock_callbacks(conn);
1318 iscsi_remove_failed_auth_entry(conn);
1319 }
1320 if (ret != 0)
1321 iscsi_target_nego_release(conn);
1322
1323 return ret;
1324}
1325
1326void iscsi_target_nego_release(struct iscsi_conn *conn)
1327{
1328 struct iscsi_login *login = conn->conn_login;
1329
1330 if (!login)
1331 return;
1332
1333 kfree(login->req_buf);
1334 kfree(login->rsp_buf);
1335 kfree(login);
1336
1337 conn->conn_login = NULL;
1338}
1339
