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19#include <linux/ctype.h>
20#include <linux/kthread.h>
21#include <scsi/iscsi_proto.h>
22#include <target/target_core_base.h>
23#include <target/target_core_fabric.h>
24#include <target/iscsi/iscsi_transport.h>
25
26#include <target/iscsi/iscsi_target_core.h>
27#include "iscsi_target_parameters.h"
28#include "iscsi_target_login.h"
29#include "iscsi_target_nego.h"
30#include "iscsi_target_tpg.h"
31#include "iscsi_target_util.h"
32#include "iscsi_target.h"
33#include "iscsi_target_auth.h"
34
35#define MAX_LOGIN_PDUS 7
36#define TEXT_LEN 4096
37
38void convert_null_to_semi(char *buf, int len)
39{
40 int i;
41
42 for (i = 0; i < len; i++)
43 if (buf[i] == '\0')
44 buf[i] = ';';
45}
46
47static int strlen_semi(char *buf)
48{
49 int i = 0;
50
51 while (buf[i] != '\0') {
52 if (buf[i] == ';')
53 return i;
54 i++;
55 }
56
57 return -1;
58}
59
60int extract_param(
61 const char *in_buf,
62 const char *pattern,
63 unsigned int max_length,
64 char *out_buf,
65 unsigned char *type)
66{
67 char *ptr;
68 int len;
69
70 if (!in_buf || !pattern || !out_buf || !type)
71 return -1;
72
73 ptr = strstr(in_buf, pattern);
74 if (!ptr)
75 return -1;
76
77 ptr = strstr(ptr, "=");
78 if (!ptr)
79 return -1;
80
81 ptr += 1;
82 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
83 ptr += 2;
84 *type = HEX;
85 } else
86 *type = DECIMAL;
87
88 len = strlen_semi(ptr);
89 if (len < 0)
90 return -1;
91
92 if (len >= max_length) {
93 pr_err("Length of input: %d exceeds max_length:"
94 " %d\n", len, max_length);
95 return -1;
96 }
97 memcpy(out_buf, ptr, len);
98 out_buf[len] = '\0';
99
100 return 0;
101}
102
103static u32 iscsi_handle_authentication(
104 struct iscsi_conn *conn,
105 char *in_buf,
106 char *out_buf,
107 int in_length,
108 int *out_length,
109 unsigned char *authtype)
110{
111 struct iscsi_session *sess = conn->sess;
112 struct iscsi_node_auth *auth;
113 struct iscsi_node_acl *iscsi_nacl;
114 struct iscsi_portal_group *iscsi_tpg;
115 struct se_node_acl *se_nacl;
116
117 if (!sess->sess_ops->SessionType) {
118
119
120
121 se_nacl = conn->sess->se_sess->se_node_acl;
122 if (!se_nacl) {
123 pr_err("Unable to locate struct se_node_acl for"
124 " CHAP auth\n");
125 return -1;
126 }
127 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
128 se_node_acl);
129 if (!iscsi_nacl) {
130 pr_err("Unable to locate struct iscsi_node_acl for"
131 " CHAP auth\n");
132 return -1;
133 }
134
135 if (se_nacl->dynamic_node_acl) {
136 iscsi_tpg = container_of(se_nacl->se_tpg,
137 struct iscsi_portal_group, tpg_se_tpg);
138
139 auth = &iscsi_tpg->tpg_demo_auth;
140 } else {
141 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
142 se_node_acl);
143
144 auth = &iscsi_nacl->node_auth;
145 }
146 } else {
147
148
149
150 auth = &iscsit_global->discovery_acl.node_auth;
151 }
152
153 if (strstr("CHAP", authtype))
154 strcpy(conn->sess->auth_type, "CHAP");
155 else
156 strcpy(conn->sess->auth_type, NONE);
157
158 if (strstr("None", authtype))
159 return 1;
160#ifdef CANSRP
161 else if (strstr("SRP", authtype))
162 return srp_main_loop(conn, auth, in_buf, out_buf,
163 &in_length, out_length);
164#endif
165 else if (strstr("CHAP", authtype))
166 return chap_main_loop(conn, auth, in_buf, out_buf,
167 &in_length, out_length);
168 else if (strstr("SPKM1", authtype))
169 return 2;
170 else if (strstr("SPKM2", authtype))
171 return 2;
172 else if (strstr("KRB5", authtype))
173 return 2;
174 else
175 return 2;
176}
177
178static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
179{
180 kfree(conn->auth_protocol);
181}
182
183int iscsi_target_check_login_request(
184 struct iscsi_conn *conn,
185 struct iscsi_login *login)
186{
187 int req_csg, req_nsg;
188 u32 payload_length;
189 struct iscsi_login_req *login_req;
190
191 login_req = (struct iscsi_login_req *) login->req;
192 payload_length = ntoh24(login_req->dlength);
193
194 switch (login_req->opcode & ISCSI_OPCODE_MASK) {
195 case ISCSI_OP_LOGIN:
196 break;
197 default:
198 pr_err("Received unknown opcode 0x%02x.\n",
199 login_req->opcode & ISCSI_OPCODE_MASK);
200 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
201 ISCSI_LOGIN_STATUS_INIT_ERR);
202 return -1;
203 }
204
205 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
206 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
207 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
208 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
209 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
210 ISCSI_LOGIN_STATUS_INIT_ERR);
211 return -1;
212 }
213
214 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
215 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
216
217 if (req_csg != login->current_stage) {
218 pr_err("Initiator unexpectedly changed login stage"
219 " from %d to %d, login failed.\n", login->current_stage,
220 req_csg);
221 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
222 ISCSI_LOGIN_STATUS_INIT_ERR);
223 return -1;
224 }
225
226 if ((req_nsg == 2) || (req_csg >= 2) ||
227 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
228 (req_nsg <= req_csg))) {
229 pr_err("Illegal login_req->flags Combination, CSG: %d,"
230 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
231 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
232 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
233 ISCSI_LOGIN_STATUS_INIT_ERR);
234 return -1;
235 }
236
237 if ((login_req->max_version != login->version_max) ||
238 (login_req->min_version != login->version_min)) {
239 pr_err("Login request changed Version Max/Nin"
240 " unexpectedly to 0x%02x/0x%02x, protocol error\n",
241 login_req->max_version, login_req->min_version);
242 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
243 ISCSI_LOGIN_STATUS_INIT_ERR);
244 return -1;
245 }
246
247 if (memcmp(login_req->isid, login->isid, 6) != 0) {
248 pr_err("Login request changed ISID unexpectedly,"
249 " protocol error.\n");
250 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
251 ISCSI_LOGIN_STATUS_INIT_ERR);
252 return -1;
253 }
254
255 if (login_req->itt != login->init_task_tag) {
256 pr_err("Login request changed ITT unexpectedly to"
257 " 0x%08x, protocol error.\n", login_req->itt);
258 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
259 ISCSI_LOGIN_STATUS_INIT_ERR);
260 return -1;
261 }
262
263 if (payload_length > MAX_KEY_VALUE_PAIRS) {
264 pr_err("Login request payload exceeds default"
265 " MaxRecvDataSegmentLength: %u, protocol error.\n",
266 MAX_KEY_VALUE_PAIRS);
267 return -1;
268 }
269
270 return 0;
271}
272
273static int iscsi_target_check_first_request(
274 struct iscsi_conn *conn,
275 struct iscsi_login *login)
276{
277 struct iscsi_param *param = NULL;
278 struct se_node_acl *se_nacl;
279
280 login->first_request = 0;
281
282 list_for_each_entry(param, &conn->param_list->param_list, p_list) {
283 if (!strncmp(param->name, SESSIONTYPE, 11)) {
284 if (!IS_PSTATE_ACCEPTOR(param)) {
285 pr_err("SessionType key not received"
286 " in first login request.\n");
287 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
288 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
289 return -1;
290 }
291 if (!strncmp(param->value, DISCOVERY, 9))
292 return 0;
293 }
294
295 if (!strncmp(param->name, INITIATORNAME, 13)) {
296 if (!IS_PSTATE_ACCEPTOR(param)) {
297 if (!login->leading_connection)
298 continue;
299
300 pr_err("InitiatorName key not received"
301 " in first login request.\n");
302 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
303 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
304 return -1;
305 }
306
307
308
309
310
311
312 if (!login->leading_connection) {
313 se_nacl = conn->sess->se_sess->se_node_acl;
314 if (!se_nacl) {
315 pr_err("Unable to locate"
316 " struct se_node_acl\n");
317 iscsit_tx_login_rsp(conn,
318 ISCSI_STATUS_CLS_INITIATOR_ERR,
319 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
320 return -1;
321 }
322
323 if (strcmp(param->value,
324 se_nacl->initiatorname)) {
325 pr_err("Incorrect"
326 " InitiatorName: %s for this"
327 " iSCSI Initiator Node.\n",
328 param->value);
329 iscsit_tx_login_rsp(conn,
330 ISCSI_STATUS_CLS_INITIATOR_ERR,
331 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
332 return -1;
333 }
334 }
335 }
336 }
337
338 return 0;
339}
340
341static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
342{
343 u32 padding = 0;
344 struct iscsi_session *sess = conn->sess;
345 struct iscsi_login_rsp *login_rsp;
346
347 login_rsp = (struct iscsi_login_rsp *) login->rsp;
348
349 login_rsp->opcode = ISCSI_OP_LOGIN_RSP;
350 hton24(login_rsp->dlength, login->rsp_length);
351 memcpy(login_rsp->isid, login->isid, 6);
352 login_rsp->tsih = cpu_to_be16(login->tsih);
353 login_rsp->itt = login->init_task_tag;
354 login_rsp->statsn = cpu_to_be32(conn->stat_sn++);
355 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
356 login_rsp->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
357
358 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
359 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
360 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
361 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
362 ntohl(login_rsp->statsn), login->rsp_length);
363
364 padding = ((-login->rsp_length) & 3);
365
366
367
368
369
370
371 if (login->login_complete) {
372 int rc = iscsit_start_kthreads(conn);
373 if (rc) {
374 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
375 ISCSI_LOGIN_STATUS_NO_RESOURCES);
376 return -1;
377 }
378 }
379
380 if (conn->conn_transport->iscsit_put_login_tx(conn, login,
381 login->rsp_length + padding) < 0)
382 goto err;
383
384 login->rsp_length = 0;
385 mutex_lock(&sess->cmdsn_mutex);
386 login_rsp->exp_cmdsn = cpu_to_be32(sess->exp_cmd_sn);
387 login_rsp->max_cmdsn = cpu_to_be32(sess->max_cmd_sn);
388 mutex_unlock(&sess->cmdsn_mutex);
389
390 return 0;
391
392err:
393 if (login->login_complete) {
394 if (conn->rx_thread && conn->rx_thread_active) {
395 send_sig(SIGINT, conn->rx_thread, 1);
396 kthread_stop(conn->rx_thread);
397 }
398 if (conn->tx_thread && conn->tx_thread_active) {
399 send_sig(SIGINT, conn->tx_thread, 1);
400 kthread_stop(conn->tx_thread);
401 }
402 spin_lock(&iscsit_global->ts_bitmap_lock);
403 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
404 get_order(1));
405 spin_unlock(&iscsit_global->ts_bitmap_lock);
406 }
407 return -1;
408}
409
410static void iscsi_target_sk_data_ready(struct sock *sk)
411{
412 struct iscsi_conn *conn = sk->sk_user_data;
413 bool rc;
414
415 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
416
417 write_lock_bh(&sk->sk_callback_lock);
418 if (!sk->sk_user_data) {
419 write_unlock_bh(&sk->sk_callback_lock);
420 return;
421 }
422 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
423 write_unlock_bh(&sk->sk_callback_lock);
424 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
425 return;
426 }
427 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
428 write_unlock_bh(&sk->sk_callback_lock);
429 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
430 return;
431 }
432 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
433 write_unlock_bh(&sk->sk_callback_lock);
434 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
435 return;
436 }
437
438 rc = schedule_delayed_work(&conn->login_work, 0);
439 if (!rc) {
440 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
441 " got false\n");
442 }
443 write_unlock_bh(&sk->sk_callback_lock);
444}
445
446static void iscsi_target_sk_state_change(struct sock *);
447
448static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
449{
450 struct sock *sk;
451
452 if (!conn->sock)
453 return;
454
455 sk = conn->sock->sk;
456 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
457
458 write_lock_bh(&sk->sk_callback_lock);
459 sk->sk_user_data = conn;
460 conn->orig_data_ready = sk->sk_data_ready;
461 conn->orig_state_change = sk->sk_state_change;
462 sk->sk_data_ready = iscsi_target_sk_data_ready;
463 sk->sk_state_change = iscsi_target_sk_state_change;
464 write_unlock_bh(&sk->sk_callback_lock);
465
466 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
467 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
468}
469
470static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
471{
472 struct sock *sk;
473
474 if (!conn->sock)
475 return;
476
477 sk = conn->sock->sk;
478 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
479
480 write_lock_bh(&sk->sk_callback_lock);
481 if (!sk->sk_user_data) {
482 write_unlock_bh(&sk->sk_callback_lock);
483 return;
484 }
485 sk->sk_user_data = NULL;
486 sk->sk_data_ready = conn->orig_data_ready;
487 sk->sk_state_change = conn->orig_state_change;
488 write_unlock_bh(&sk->sk_callback_lock);
489
490 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
491 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
492}
493
494static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
495
496static bool iscsi_target_sk_state_check(struct sock *sk)
497{
498 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
499 pr_debug("iscsi_target_sk_state_check: TCP_CLOSE_WAIT|TCP_CLOSE,"
500 "returning FALSE\n");
501 return false;
502 }
503 return true;
504}
505
506static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
507{
508 struct iscsi_np *np = login->np;
509 bool zero_tsih = login->zero_tsih;
510
511 iscsi_remove_failed_auth_entry(conn);
512 iscsi_target_nego_release(conn);
513 iscsi_target_login_sess_out(conn, np, zero_tsih, true);
514}
515
516static void iscsi_target_login_timeout(unsigned long data)
517{
518 struct iscsi_conn *conn = (struct iscsi_conn *)data;
519
520 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
521
522 if (conn->login_kworker) {
523 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
524 conn->login_kworker->comm, conn->login_kworker->pid);
525 send_sig(SIGINT, conn->login_kworker, 1);
526 }
527}
528
529static void iscsi_target_do_login_rx(struct work_struct *work)
530{
531 struct iscsi_conn *conn = container_of(work,
532 struct iscsi_conn, login_work.work);
533 struct iscsi_login *login = conn->login;
534 struct iscsi_np *np = login->np;
535 struct iscsi_portal_group *tpg = conn->tpg;
536 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
537 struct timer_list login_timer;
538 int rc, zero_tsih = login->zero_tsih;
539 bool state;
540
541 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
542 conn, current->comm, current->pid);
543
544 spin_lock(&tpg->tpg_state_lock);
545 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
546 spin_unlock(&tpg->tpg_state_lock);
547
548 if (!state) {
549 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
550 iscsi_target_restore_sock_callbacks(conn);
551 iscsi_target_login_drop(conn, login);
552 iscsit_deaccess_np(np, tpg, tpg_np);
553 return;
554 }
555
556 if (conn->sock) {
557 struct sock *sk = conn->sock->sk;
558
559 read_lock_bh(&sk->sk_callback_lock);
560 state = iscsi_target_sk_state_check(sk);
561 read_unlock_bh(&sk->sk_callback_lock);
562
563 if (!state) {
564 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
565 iscsi_target_restore_sock_callbacks(conn);
566 iscsi_target_login_drop(conn, login);
567 iscsit_deaccess_np(np, tpg, tpg_np);
568 return;
569 }
570 }
571
572 conn->login_kworker = current;
573 allow_signal(SIGINT);
574
575 init_timer(&login_timer);
576 login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
577 login_timer.data = (unsigned long)conn;
578 login_timer.function = iscsi_target_login_timeout;
579 add_timer(&login_timer);
580 pr_debug("Starting login_timer for %s/%d\n", current->comm, current->pid);
581
582 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
583 del_timer_sync(&login_timer);
584 flush_signals(current);
585 conn->login_kworker = NULL;
586
587 if (rc < 0) {
588 iscsi_target_restore_sock_callbacks(conn);
589 iscsi_target_login_drop(conn, login);
590 iscsit_deaccess_np(np, tpg, tpg_np);
591 return;
592 }
593
594 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
595 conn, current->comm, current->pid);
596
597 rc = iscsi_target_do_login(conn, login);
598 if (rc < 0) {
599 iscsi_target_restore_sock_callbacks(conn);
600 iscsi_target_login_drop(conn, login);
601 iscsit_deaccess_np(np, tpg, tpg_np);
602 } else if (!rc) {
603 if (conn->sock) {
604 struct sock *sk = conn->sock->sk;
605
606 write_lock_bh(&sk->sk_callback_lock);
607 clear_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags);
608 write_unlock_bh(&sk->sk_callback_lock);
609 }
610 } else if (rc == 1) {
611 iscsi_target_nego_release(conn);
612 iscsi_post_login_handler(np, conn, zero_tsih);
613 iscsit_deaccess_np(np, tpg, tpg_np);
614 }
615}
616
617static void iscsi_target_do_cleanup(struct work_struct *work)
618{
619 struct iscsi_conn *conn = container_of(work,
620 struct iscsi_conn, login_cleanup_work.work);
621 struct sock *sk = conn->sock->sk;
622 struct iscsi_login *login = conn->login;
623 struct iscsi_np *np = login->np;
624 struct iscsi_portal_group *tpg = conn->tpg;
625 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
626
627 pr_debug("Entering iscsi_target_do_cleanup\n");
628
629 cancel_delayed_work_sync(&conn->login_work);
630 conn->orig_state_change(sk);
631
632 iscsi_target_restore_sock_callbacks(conn);
633 iscsi_target_login_drop(conn, login);
634 iscsit_deaccess_np(np, tpg, tpg_np);
635
636 pr_debug("iscsi_target_do_cleanup done()\n");
637}
638
639static void iscsi_target_sk_state_change(struct sock *sk)
640{
641 struct iscsi_conn *conn;
642 void (*orig_state_change)(struct sock *);
643 bool state;
644
645 pr_debug("Entering iscsi_target_sk_state_change\n");
646
647 write_lock_bh(&sk->sk_callback_lock);
648 conn = sk->sk_user_data;
649 if (!conn) {
650 write_unlock_bh(&sk->sk_callback_lock);
651 return;
652 }
653 orig_state_change = conn->orig_state_change;
654
655 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
656 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
657 conn);
658 write_unlock_bh(&sk->sk_callback_lock);
659 orig_state_change(sk);
660 return;
661 }
662 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
663 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
664 " conn: %p\n", conn);
665 write_unlock_bh(&sk->sk_callback_lock);
666 orig_state_change(sk);
667 return;
668 }
669 if (test_and_set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
670 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
671 conn);
672 write_unlock_bh(&sk->sk_callback_lock);
673 orig_state_change(sk);
674 return;
675 }
676
677 state = iscsi_target_sk_state_check(sk);
678 write_unlock_bh(&sk->sk_callback_lock);
679
680 pr_debug("iscsi_target_sk_state_change: state: %d\n", state);
681
682 if (!state) {
683 pr_debug("iscsi_target_sk_state_change got failed state\n");
684 schedule_delayed_work(&conn->login_cleanup_work, 0);
685 return;
686 }
687 orig_state_change(sk);
688}
689
690
691
692
693
694
695static int iscsi_target_check_for_existing_instances(
696 struct iscsi_conn *conn,
697 struct iscsi_login *login)
698{
699 if (login->checked_for_existing)
700 return 0;
701
702 login->checked_for_existing = 1;
703
704 if (!login->tsih)
705 return iscsi_check_for_session_reinstatement(conn);
706 else
707 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
708 login->initial_exp_statsn);
709}
710
711static int iscsi_target_do_authentication(
712 struct iscsi_conn *conn,
713 struct iscsi_login *login)
714{
715 int authret;
716 u32 payload_length;
717 struct iscsi_param *param;
718 struct iscsi_login_req *login_req;
719 struct iscsi_login_rsp *login_rsp;
720
721 login_req = (struct iscsi_login_req *) login->req;
722 login_rsp = (struct iscsi_login_rsp *) login->rsp;
723 payload_length = ntoh24(login_req->dlength);
724
725 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
726 if (!param)
727 return -1;
728
729 authret = iscsi_handle_authentication(
730 conn,
731 login->req_buf,
732 login->rsp_buf,
733 payload_length,
734 &login->rsp_length,
735 param->value);
736 switch (authret) {
737 case 0:
738 pr_debug("Received OK response"
739 " from LIO Authentication, continuing.\n");
740 break;
741 case 1:
742 pr_debug("iSCSI security negotiation"
743 " completed successfully.\n");
744 login->auth_complete = 1;
745 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
746 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
747 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
748 ISCSI_FLAG_LOGIN_TRANSIT);
749 login->current_stage = 1;
750 }
751 return iscsi_target_check_for_existing_instances(
752 conn, login);
753 case 2:
754 pr_err("Security negotiation"
755 " failed.\n");
756 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
757 ISCSI_LOGIN_STATUS_AUTH_FAILED);
758 return -1;
759 default:
760 pr_err("Received unknown error %d from LIO"
761 " Authentication\n", authret);
762 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
763 ISCSI_LOGIN_STATUS_TARGET_ERROR);
764 return -1;
765 }
766
767 return 0;
768}
769
770static int iscsi_target_handle_csg_zero(
771 struct iscsi_conn *conn,
772 struct iscsi_login *login)
773{
774 int ret;
775 u32 payload_length;
776 struct iscsi_param *param;
777 struct iscsi_login_req *login_req;
778 struct iscsi_login_rsp *login_rsp;
779
780 login_req = (struct iscsi_login_req *) login->req;
781 login_rsp = (struct iscsi_login_rsp *) login->rsp;
782 payload_length = ntoh24(login_req->dlength);
783
784 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
785 if (!param)
786 return -1;
787
788 ret = iscsi_decode_text_input(
789 PHASE_SECURITY|PHASE_DECLARATIVE,
790 SENDER_INITIATOR|SENDER_RECEIVER,
791 login->req_buf,
792 payload_length,
793 conn);
794 if (ret < 0)
795 return -1;
796
797 if (ret > 0) {
798 if (login->auth_complete) {
799 pr_err("Initiator has already been"
800 " successfully authenticated, but is still"
801 " sending %s keys.\n", param->value);
802 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
803 ISCSI_LOGIN_STATUS_INIT_ERR);
804 return -1;
805 }
806
807 goto do_auth;
808 } else if (!payload_length) {
809 pr_err("Initiator sent zero length security payload,"
810 " login failed\n");
811 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
812 ISCSI_LOGIN_STATUS_AUTH_FAILED);
813 return -1;
814 }
815
816 if (login->first_request)
817 if (iscsi_target_check_first_request(conn, login) < 0)
818 return -1;
819
820 ret = iscsi_encode_text_output(
821 PHASE_SECURITY|PHASE_DECLARATIVE,
822 SENDER_TARGET,
823 login->rsp_buf,
824 &login->rsp_length,
825 conn->param_list);
826 if (ret < 0)
827 return -1;
828
829 if (!iscsi_check_negotiated_keys(conn->param_list)) {
830 if (conn->tpg->tpg_attrib.authentication &&
831 !strncmp(param->value, NONE, 4)) {
832 pr_err("Initiator sent AuthMethod=None but"
833 " Target is enforcing iSCSI Authentication,"
834 " login failed.\n");
835 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
836 ISCSI_LOGIN_STATUS_AUTH_FAILED);
837 return -1;
838 }
839
840 if (conn->tpg->tpg_attrib.authentication &&
841 !login->auth_complete)
842 return 0;
843
844 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
845 return 0;
846
847 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
848 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
849 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
850 ISCSI_FLAG_LOGIN_TRANSIT;
851 login->current_stage = 1;
852 }
853 }
854
855 return 0;
856do_auth:
857 return iscsi_target_do_authentication(conn, login);
858}
859
860static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
861{
862 int ret;
863 u32 payload_length;
864 struct iscsi_login_req *login_req;
865 struct iscsi_login_rsp *login_rsp;
866
867 login_req = (struct iscsi_login_req *) login->req;
868 login_rsp = (struct iscsi_login_rsp *) login->rsp;
869 payload_length = ntoh24(login_req->dlength);
870
871 ret = iscsi_decode_text_input(
872 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
873 SENDER_INITIATOR|SENDER_RECEIVER,
874 login->req_buf,
875 payload_length,
876 conn);
877 if (ret < 0) {
878 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
879 ISCSI_LOGIN_STATUS_INIT_ERR);
880 return -1;
881 }
882
883 if (login->first_request)
884 if (iscsi_target_check_first_request(conn, login) < 0)
885 return -1;
886
887 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
888 return -1;
889
890 ret = iscsi_encode_text_output(
891 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
892 SENDER_TARGET,
893 login->rsp_buf,
894 &login->rsp_length,
895 conn->param_list);
896 if (ret < 0) {
897 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
898 ISCSI_LOGIN_STATUS_INIT_ERR);
899 return -1;
900 }
901
902 if (!login->auth_complete &&
903 conn->tpg->tpg_attrib.authentication) {
904 pr_err("Initiator is requesting CSG: 1, has not been"
905 " successfully authenticated, and the Target is"
906 " enforcing iSCSI Authentication, login failed.\n");
907 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
908 ISCSI_LOGIN_STATUS_AUTH_FAILED);
909 return -1;
910 }
911
912 if (!iscsi_check_negotiated_keys(conn->param_list))
913 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
914 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
915 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
916 ISCSI_FLAG_LOGIN_TRANSIT;
917
918 return 0;
919}
920
921static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
922{
923 int pdu_count = 0;
924 struct iscsi_login_req *login_req;
925 struct iscsi_login_rsp *login_rsp;
926
927 login_req = (struct iscsi_login_req *) login->req;
928 login_rsp = (struct iscsi_login_rsp *) login->rsp;
929
930 while (1) {
931 if (++pdu_count > MAX_LOGIN_PDUS) {
932 pr_err("MAX_LOGIN_PDUS count reached.\n");
933 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
934 ISCSI_LOGIN_STATUS_TARGET_ERROR);
935 return -1;
936 }
937
938 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
939 case 0:
940 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
941 if (iscsi_target_handle_csg_zero(conn, login) < 0)
942 return -1;
943 break;
944 case 1:
945 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
946 if (iscsi_target_handle_csg_one(conn, login) < 0)
947 return -1;
948 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
949 login->tsih = conn->sess->tsih;
950 login->login_complete = 1;
951 iscsi_target_restore_sock_callbacks(conn);
952 if (iscsi_target_do_tx_login_io(conn,
953 login) < 0)
954 return -1;
955 return 1;
956 }
957 break;
958 default:
959 pr_err("Illegal CSG: %d received from"
960 " Initiator, protocol error.\n",
961 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
962 break;
963 }
964
965 if (iscsi_target_do_tx_login_io(conn, login) < 0)
966 return -1;
967
968 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
969 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
970 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
971 }
972 break;
973 }
974
975 if (conn->sock) {
976 struct sock *sk = conn->sock->sk;
977 bool state;
978
979 read_lock_bh(&sk->sk_callback_lock);
980 state = iscsi_target_sk_state_check(sk);
981 read_unlock_bh(&sk->sk_callback_lock);
982
983 if (!state) {
984 pr_debug("iscsi_target_do_login() failed state for"
985 " conn: %p\n", conn);
986 return -1;
987 }
988 }
989
990 return 0;
991}
992
993static void iscsi_initiatorname_tolower(
994 char *param_buf)
995{
996 char *c;
997 u32 iqn_size = strlen(param_buf), i;
998
999 for (i = 0; i < iqn_size; i++) {
1000 c = ¶m_buf[i];
1001 if (!isupper(*c))
1002 continue;
1003
1004 *c = tolower(*c);
1005 }
1006}
1007
1008
1009
1010
1011int iscsi_target_locate_portal(
1012 struct iscsi_np *np,
1013 struct iscsi_conn *conn,
1014 struct iscsi_login *login)
1015{
1016 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1017 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1018 struct iscsi_session *sess = conn->sess;
1019 struct iscsi_tiqn *tiqn;
1020 struct iscsi_tpg_np *tpg_np = NULL;
1021 struct iscsi_login_req *login_req;
1022 struct se_node_acl *se_nacl;
1023 u32 payload_length, queue_depth = 0;
1024 int sessiontype = 0, ret = 0, tag_num, tag_size;
1025
1026 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1027 INIT_DELAYED_WORK(&conn->login_cleanup_work, iscsi_target_do_cleanup);
1028 iscsi_target_set_sock_callbacks(conn);
1029
1030 login->np = np;
1031
1032 login_req = (struct iscsi_login_req *) login->req;
1033 payload_length = ntoh24(login_req->dlength);
1034
1035 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1036 if (!tmpbuf) {
1037 pr_err("Unable to allocate memory for tmpbuf.\n");
1038 return -1;
1039 }
1040
1041 memcpy(tmpbuf, login->req_buf, payload_length);
1042 tmpbuf[payload_length] = '\0';
1043 start = tmpbuf;
1044 end = (start + payload_length);
1045
1046
1047
1048
1049
1050 while (start < end) {
1051 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1052 ret = -1;
1053 goto out;
1054 }
1055
1056 if (!strncmp(key, "InitiatorName", 13))
1057 i_buf = value;
1058 else if (!strncmp(key, "SessionType", 11))
1059 s_buf = value;
1060 else if (!strncmp(key, "TargetName", 10))
1061 t_buf = value;
1062
1063 start += strlen(key) + strlen(value) + 2;
1064 }
1065
1066
1067
1068 if (!i_buf) {
1069 pr_err("InitiatorName key not received"
1070 " in first login request.\n");
1071 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1072 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1073 ret = -1;
1074 goto out;
1075 }
1076
1077
1078
1079
1080
1081 iscsi_initiatorname_tolower(i_buf);
1082
1083 if (!s_buf) {
1084 if (!login->leading_connection)
1085 goto get_target;
1086
1087 pr_err("SessionType key not received"
1088 " in first login request.\n");
1089 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1090 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1091 ret = -1;
1092 goto out;
1093 }
1094
1095
1096
1097
1098 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1099 if (!sessiontype) {
1100 conn->tpg = iscsit_global->discovery_tpg;
1101 if (!login->leading_connection)
1102 goto get_target;
1103
1104 sess->sess_ops->SessionType = 1;
1105
1106
1107
1108 if (iscsi_login_setup_crypto(conn) < 0) {
1109 pr_err("iscsi_login_setup_crypto() failed\n");
1110 ret = -1;
1111 goto out;
1112 }
1113
1114
1115
1116
1117 if (iscsit_access_np(np, conn->tpg) < 0) {
1118 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1119 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1120 ret = -1;
1121 goto out;
1122 }
1123 ret = 0;
1124 goto alloc_tags;
1125 }
1126
1127get_target:
1128 if (!t_buf) {
1129 pr_err("TargetName key not received"
1130 " in first login request while"
1131 " SessionType=Normal.\n");
1132 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1133 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1134 ret = -1;
1135 goto out;
1136 }
1137
1138
1139
1140
1141 tiqn = iscsit_get_tiqn_for_login(t_buf);
1142 if (!tiqn) {
1143 pr_err("Unable to locate Target IQN: %s in"
1144 " Storage Node\n", t_buf);
1145 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1146 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1147 ret = -1;
1148 goto out;
1149 }
1150 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1151
1152
1153
1154
1155 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1156 if (!conn->tpg) {
1157 pr_err("Unable to locate Target Portal Group"
1158 " on %s\n", tiqn->tiqn);
1159 iscsit_put_tiqn_for_login(tiqn);
1160 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1161 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1162 ret = -1;
1163 goto out;
1164 }
1165 conn->tpg_np = tpg_np;
1166 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1167
1168
1169
1170 if (iscsi_login_setup_crypto(conn) < 0) {
1171 pr_err("iscsi_login_setup_crypto() failed\n");
1172 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1173 iscsit_put_tiqn_for_login(tiqn);
1174 conn->tpg = NULL;
1175 ret = -1;
1176 goto out;
1177 }
1178
1179
1180
1181
1182 if (iscsit_access_np(np, conn->tpg) < 0) {
1183 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1184 iscsit_put_tiqn_for_login(tiqn);
1185 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1186 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1187 conn->tpg = NULL;
1188 ret = -1;
1189 goto out;
1190 }
1191
1192
1193
1194
1195
1196
1197 if (!login->leading_connection) {
1198 ret = 0;
1199 goto out;
1200 }
1201
1202
1203
1204
1205 sess->sess_ops->SessionType = 0;
1206
1207
1208
1209
1210 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1211 &conn->tpg->tpg_se_tpg, i_buf);
1212 if (!sess->se_sess->se_node_acl) {
1213 pr_err("iSCSI Initiator Node: %s is not authorized to"
1214 " access iSCSI target portal group: %hu.\n",
1215 i_buf, conn->tpg->tpgt);
1216 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1217 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1218 ret = -1;
1219 goto out;
1220 }
1221 se_nacl = sess->se_sess->se_node_acl;
1222 queue_depth = se_nacl->queue_depth;
1223
1224
1225
1226
1227
1228
1229
1230
1231alloc_tags:
1232 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1233 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1234 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1235
1236 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1237 if (ret < 0) {
1238 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1239 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1240 ret = -1;
1241 }
1242out:
1243 kfree(tmpbuf);
1244 return ret;
1245}
1246
1247int iscsi_target_start_negotiation(
1248 struct iscsi_login *login,
1249 struct iscsi_conn *conn)
1250{
1251 int ret;
1252
1253 ret = iscsi_target_do_login(conn, login);
1254 if (!ret) {
1255 if (conn->sock) {
1256 struct sock *sk = conn->sock->sk;
1257
1258 write_lock_bh(&sk->sk_callback_lock);
1259 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1260 write_unlock_bh(&sk->sk_callback_lock);
1261 }
1262 } else if (ret < 0) {
1263 cancel_delayed_work_sync(&conn->login_work);
1264 cancel_delayed_work_sync(&conn->login_cleanup_work);
1265 iscsi_target_restore_sock_callbacks(conn);
1266 iscsi_remove_failed_auth_entry(conn);
1267 }
1268 if (ret != 0)
1269 iscsi_target_nego_release(conn);
1270
1271 return ret;
1272}
1273
1274void iscsi_target_nego_release(struct iscsi_conn *conn)
1275{
1276 struct iscsi_login *login = conn->conn_login;
1277
1278 if (!login)
1279 return;
1280
1281 kfree(login->req_buf);
1282 kfree(login->rsp_buf);
1283 kfree(login);
1284
1285 conn->conn_login = NULL;
1286}
1287
