1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19#include <linux/ctype.h>
20#include <linux/kthread.h>
21#include <scsi/iscsi_proto.h>
22#include <target/target_core_base.h>
23#include <target/target_core_fabric.h>
24#include <target/iscsi/iscsi_transport.h>
25
26#include <target/iscsi/iscsi_target_core.h>
27#include "iscsi_target_parameters.h"
28#include "iscsi_target_login.h"
29#include "iscsi_target_nego.h"
30#include "iscsi_target_tpg.h"
31#include "iscsi_target_util.h"
32#include "iscsi_target.h"
33#include "iscsi_target_auth.h"
34
35#define MAX_LOGIN_PDUS 7
36#define TEXT_LEN 4096
37
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}
272EXPORT_SYMBOL(iscsi_target_check_login_request);
273
274static int iscsi_target_check_first_request(
275 struct iscsi_conn *conn,
276 struct iscsi_login *login)
277{
278 struct iscsi_param *param = NULL;
279 struct se_node_acl *se_nacl;
280
281 login->first_request = 0;
282
283 list_for_each_entry(param, &conn->param_list->param_list, p_list) {
284 if (!strncmp(param->name, SESSIONTYPE, 11)) {
285 if (!IS_PSTATE_ACCEPTOR(param)) {
286 pr_err("SessionType key not received"
287 " in first login request.\n");
288 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
289 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
290 return -1;
291 }
292 if (!strncmp(param->value, DISCOVERY, 9))
293 return 0;
294 }
295
296 if (!strncmp(param->name, INITIATORNAME, 13)) {
297 if (!IS_PSTATE_ACCEPTOR(param)) {
298 if (!login->leading_connection)
299 continue;
300
301 pr_err("InitiatorName key not received"
302 " in first login request.\n");
303 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
304 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
305 return -1;
306 }
307
308
309
310
311
312
313 if (!login->leading_connection) {
314 se_nacl = conn->sess->se_sess->se_node_acl;
315 if (!se_nacl) {
316 pr_err("Unable to locate"
317 " struct se_node_acl\n");
318 iscsit_tx_login_rsp(conn,
319 ISCSI_STATUS_CLS_INITIATOR_ERR,
320 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
321 return -1;
322 }
323
324 if (strcmp(param->value,
325 se_nacl->initiatorname)) {
326 pr_err("Incorrect"
327 " InitiatorName: %s for this"
328 " iSCSI Initiator Node.\n",
329 param->value);
330 iscsit_tx_login_rsp(conn,
331 ISCSI_STATUS_CLS_INITIATOR_ERR,
332 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
333 return -1;
334 }
335 }
336 }
337 }
338
339 return 0;
340}
341
342static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
343{
344 u32 padding = 0;
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((u32) atomic_read(&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
386 return 0;
387
388err:
389 if (login->login_complete) {
390 if (conn->rx_thread && conn->rx_thread_active) {
391 send_sig(SIGINT, conn->rx_thread, 1);
392 complete(&conn->rx_login_comp);
393 kthread_stop(conn->rx_thread);
394 }
395 if (conn->tx_thread && conn->tx_thread_active) {
396 send_sig(SIGINT, conn->tx_thread, 1);
397 kthread_stop(conn->tx_thread);
398 }
399 spin_lock(&iscsit_global->ts_bitmap_lock);
400 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
401 get_order(1));
402 spin_unlock(&iscsit_global->ts_bitmap_lock);
403 }
404 return -1;
405}
406
407static void iscsi_target_sk_data_ready(struct sock *sk, int bytes)
408{
409 struct iscsi_conn *conn = sk->sk_user_data;
410 bool rc;
411
412 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
413
414 write_lock_bh(&sk->sk_callback_lock);
415 if (!sk->sk_user_data) {
416 write_unlock_bh(&sk->sk_callback_lock);
417 return;
418 }
419 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
420 write_unlock_bh(&sk->sk_callback_lock);
421 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
422 return;
423 }
424 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
425 write_unlock_bh(&sk->sk_callback_lock);
426 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
427 return;
428 }
429 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
430 write_unlock_bh(&sk->sk_callback_lock);
431 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
432 return;
433 }
434
435 rc = schedule_delayed_work(&conn->login_work, 0);
436 if (!rc) {
437 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
438 " got false\n");
439 }
440 write_unlock_bh(&sk->sk_callback_lock);
441}
442
443static void iscsi_target_sk_state_change(struct sock *);
444
445static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
446{
447 struct sock *sk;
448
449 if (!conn->sock)
450 return;
451
452 sk = conn->sock->sk;
453 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
454
455 write_lock_bh(&sk->sk_callback_lock);
456 sk->sk_user_data = conn;
457 conn->orig_data_ready = sk->sk_data_ready;
458 conn->orig_state_change = sk->sk_state_change;
459 sk->sk_data_ready = iscsi_target_sk_data_ready;
460 sk->sk_state_change = iscsi_target_sk_state_change;
461 write_unlock_bh(&sk->sk_callback_lock);
462
463 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
464 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
465}
466
467static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
468{
469 struct sock *sk;
470
471 if (!conn->sock)
472 return;
473
474 sk = conn->sock->sk;
475 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
476
477 write_lock_bh(&sk->sk_callback_lock);
478 if (!sk->sk_user_data) {
479 write_unlock_bh(&sk->sk_callback_lock);
480 return;
481 }
482 sk->sk_user_data = NULL;
483 sk->sk_data_ready = conn->orig_data_ready;
484 sk->sk_state_change = conn->orig_state_change;
485 write_unlock_bh(&sk->sk_callback_lock);
486
487 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
488 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
489}
490
491static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
492
493static bool __iscsi_target_sk_check_close(struct sock *sk)
494{
495 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
496 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE,"
497 "returning FALSE\n");
498 return true;
499 }
500 return false;
501}
502
503static bool iscsi_target_sk_check_close(struct iscsi_conn *conn)
504{
505 bool state = false;
506
507 if (conn->sock) {
508 struct sock *sk = conn->sock->sk;
509
510 read_lock_bh(&sk->sk_callback_lock);
511 state = (__iscsi_target_sk_check_close(sk) ||
512 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
513 read_unlock_bh(&sk->sk_callback_lock);
514 }
515 return state;
516}
517
518static bool iscsi_target_sk_check_flag(struct iscsi_conn *conn, unsigned int flag)
519{
520 bool state = false;
521
522 if (conn->sock) {
523 struct sock *sk = conn->sock->sk;
524
525 read_lock_bh(&sk->sk_callback_lock);
526 state = test_bit(flag, &conn->login_flags);
527 read_unlock_bh(&sk->sk_callback_lock);
528 }
529 return state;
530}
531
532static bool iscsi_target_sk_check_and_clear(struct iscsi_conn *conn, unsigned int flag)
533{
534 bool state = false;
535
536 if (conn->sock) {
537 struct sock *sk = conn->sock->sk;
538
539 write_lock_bh(&sk->sk_callback_lock);
540 state = (__iscsi_target_sk_check_close(sk) ||
541 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
542 if (!state)
543 clear_bit(flag, &conn->login_flags);
544 write_unlock_bh(&sk->sk_callback_lock);
545 }
546 return state;
547}
548
549static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
550{
551 struct iscsi_np *np = login->np;
552 bool zero_tsih = login->zero_tsih;
553
554 iscsi_remove_failed_auth_entry(conn);
555 iscsi_target_nego_release(conn);
556 iscsi_target_login_sess_out(conn, np, zero_tsih, true);
557}
558
559static void iscsi_target_login_timeout(unsigned long data)
560{
561 struct iscsi_conn *conn = (struct iscsi_conn *)data;
562
563 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
564
565 if (conn->login_kworker) {
566 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
567 conn->login_kworker->comm, conn->login_kworker->pid);
568 send_sig(SIGINT, conn->login_kworker, 1);
569 }
570}
571
572static void iscsi_target_do_login_rx(struct work_struct *work)
573{
574 struct iscsi_conn *conn = container_of(work,
575 struct iscsi_conn, login_work.work);
576 struct iscsi_login *login = conn->login;
577 struct iscsi_np *np = login->np;
578 struct iscsi_portal_group *tpg = conn->tpg;
579 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
580 struct timer_list login_timer;
581 int rc, zero_tsih = login->zero_tsih;
582 bool state;
583
584 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
585 conn, current->comm, current->pid);
586
587
588
589
590
591
592
593
594
595
596 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) {
597 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10));
598 return;
599 }
600
601 spin_lock(&tpg->tpg_state_lock);
602 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
603 spin_unlock(&tpg->tpg_state_lock);
604
605 if (!state) {
606 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
607 goto err;
608 }
609
610 if (iscsi_target_sk_check_close(conn)) {
611 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
612 goto err;
613 }
614
615 conn->login_kworker = current;
616 allow_signal(SIGINT);
617
618 init_timer_on_stack(&login_timer);
619 login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
620 login_timer.data = (unsigned long)conn;
621 login_timer.function = iscsi_target_login_timeout;
622 add_timer(&login_timer);
623 pr_debug("Starting login_timer for %s/%d\n", current->comm, current->pid);
624
625 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
626 del_timer_sync(&login_timer);
627 flush_signals(current);
628 conn->login_kworker = NULL;
629
630 if (rc < 0)
631 goto err;
632
633 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
634 conn, current->comm, current->pid);
635
636 rc = iscsi_target_do_login(conn, login);
637 if (rc < 0) {
638 goto err;
639 } else if (!rc) {
640 if (iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_READ_ACTIVE))
641 goto err;
642 } else if (rc == 1) {
643 iscsi_target_nego_release(conn);
644 iscsi_post_login_handler(np, conn, zero_tsih);
645 iscsit_deaccess_np(np, tpg, tpg_np);
646 }
647 return;
648
649err:
650 iscsi_target_restore_sock_callbacks(conn);
651 iscsi_target_login_drop(conn, login);
652 iscsit_deaccess_np(np, tpg, tpg_np);
653}
654
655static void iscsi_target_sk_state_change(struct sock *sk)
656{
657 struct iscsi_conn *conn;
658 void (*orig_state_change)(struct sock *);
659 bool state;
660
661 pr_debug("Entering iscsi_target_sk_state_change\n");
662
663 write_lock_bh(&sk->sk_callback_lock);
664 conn = sk->sk_user_data;
665 if (!conn) {
666 write_unlock_bh(&sk->sk_callback_lock);
667 return;
668 }
669 orig_state_change = conn->orig_state_change;
670
671 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
672 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
673 conn);
674 write_unlock_bh(&sk->sk_callback_lock);
675 orig_state_change(sk);
676 return;
677 }
678 state = __iscsi_target_sk_check_close(sk);
679 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state);
680
681 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
682 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
683 " conn: %p\n", conn);
684 if (state)
685 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
686 write_unlock_bh(&sk->sk_callback_lock);
687 orig_state_change(sk);
688 return;
689 }
690 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
691 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
692 conn);
693 write_unlock_bh(&sk->sk_callback_lock);
694 orig_state_change(sk);
695 return;
696 }
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712 if (state) {
713 pr_debug("iscsi_target_sk_state_change got failed state\n");
714 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
715 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
716 write_unlock_bh(&sk->sk_callback_lock);
717
718 orig_state_change(sk);
719
720 if (!state)
721 schedule_delayed_work(&conn->login_work, 0);
722 return;
723 }
724 write_unlock_bh(&sk->sk_callback_lock);
725
726 orig_state_change(sk);
727}
728
729
730
731
732
733
734static int iscsi_target_check_for_existing_instances(
735 struct iscsi_conn *conn,
736 struct iscsi_login *login)
737{
738 if (login->checked_for_existing)
739 return 0;
740
741 login->checked_for_existing = 1;
742
743 if (!login->tsih)
744 return iscsi_check_for_session_reinstatement(conn);
745 else
746 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
747 login->initial_exp_statsn);
748}
749
750static int iscsi_target_do_authentication(
751 struct iscsi_conn *conn,
752 struct iscsi_login *login)
753{
754 int authret;
755 u32 payload_length;
756 struct iscsi_param *param;
757 struct iscsi_login_req *login_req;
758 struct iscsi_login_rsp *login_rsp;
759
760 login_req = (struct iscsi_login_req *) login->req;
761 login_rsp = (struct iscsi_login_rsp *) login->rsp;
762 payload_length = ntoh24(login_req->dlength);
763
764 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
765 if (!param)
766 return -1;
767
768 authret = iscsi_handle_authentication(
769 conn,
770 login->req_buf,
771 login->rsp_buf,
772 payload_length,
773 &login->rsp_length,
774 param->value);
775 switch (authret) {
776 case 0:
777 pr_debug("Received OK response"
778 " from LIO Authentication, continuing.\n");
779 break;
780 case 1:
781 pr_debug("iSCSI security negotiation"
782 " completed successfully.\n");
783 login->auth_complete = 1;
784 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
785 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
786 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
787 ISCSI_FLAG_LOGIN_TRANSIT);
788 login->current_stage = 1;
789 }
790 return iscsi_target_check_for_existing_instances(
791 conn, login);
792 case 2:
793 pr_err("Security negotiation"
794 " failed.\n");
795 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
796 ISCSI_LOGIN_STATUS_AUTH_FAILED);
797 return -1;
798 default:
799 pr_err("Received unknown error %d from LIO"
800 " Authentication\n", authret);
801 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
802 ISCSI_LOGIN_STATUS_TARGET_ERROR);
803 return -1;
804 }
805
806 return 0;
807}
808
809static int iscsi_target_handle_csg_zero(
810 struct iscsi_conn *conn,
811 struct iscsi_login *login)
812{
813 int ret;
814 u32 payload_length;
815 struct iscsi_param *param;
816 struct iscsi_login_req *login_req;
817 struct iscsi_login_rsp *login_rsp;
818
819 login_req = (struct iscsi_login_req *) login->req;
820 login_rsp = (struct iscsi_login_rsp *) login->rsp;
821 payload_length = ntoh24(login_req->dlength);
822
823 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
824 if (!param)
825 return -1;
826
827 ret = iscsi_decode_text_input(
828 PHASE_SECURITY|PHASE_DECLARATIVE,
829 SENDER_INITIATOR|SENDER_RECEIVER,
830 login->req_buf,
831 payload_length,
832 conn);
833 if (ret < 0)
834 return -1;
835
836 if (ret > 0) {
837 if (login->auth_complete) {
838 pr_err("Initiator has already been"
839 " successfully authenticated, but is still"
840 " sending %s keys.\n", param->value);
841 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
842 ISCSI_LOGIN_STATUS_INIT_ERR);
843 return -1;
844 }
845
846 goto do_auth;
847 } else if (!payload_length) {
848 pr_err("Initiator sent zero length security payload,"
849 " login failed\n");
850 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
851 ISCSI_LOGIN_STATUS_AUTH_FAILED);
852 return -1;
853 }
854
855 if (login->first_request)
856 if (iscsi_target_check_first_request(conn, login) < 0)
857 return -1;
858
859 ret = iscsi_encode_text_output(
860 PHASE_SECURITY|PHASE_DECLARATIVE,
861 SENDER_TARGET,
862 login->rsp_buf,
863 &login->rsp_length,
864 conn->param_list,
865 conn->tpg->tpg_attrib.login_keys_workaround);
866 if (ret < 0)
867 return -1;
868
869 if (!iscsi_check_negotiated_keys(conn->param_list)) {
870 if (conn->tpg->tpg_attrib.authentication &&
871 !strncmp(param->value, NONE, 4)) {
872 pr_err("Initiator sent AuthMethod=None but"
873 " Target is enforcing iSCSI Authentication,"
874 " 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 (conn->tpg->tpg_attrib.authentication &&
881 !login->auth_complete)
882 return 0;
883
884 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
885 return 0;
886
887 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
888 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
889 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
890 ISCSI_FLAG_LOGIN_TRANSIT;
891 login->current_stage = 1;
892 }
893 }
894
895 return 0;
896do_auth:
897 return iscsi_target_do_authentication(conn, login);
898}
899
900static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
901{
902 int ret;
903 u32 payload_length;
904 struct iscsi_login_req *login_req;
905 struct iscsi_login_rsp *login_rsp;
906
907 login_req = (struct iscsi_login_req *) login->req;
908 login_rsp = (struct iscsi_login_rsp *) login->rsp;
909 payload_length = ntoh24(login_req->dlength);
910
911 ret = iscsi_decode_text_input(
912 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
913 SENDER_INITIATOR|SENDER_RECEIVER,
914 login->req_buf,
915 payload_length,
916 conn);
917 if (ret < 0) {
918 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
919 ISCSI_LOGIN_STATUS_INIT_ERR);
920 return -1;
921 }
922
923 if (login->first_request)
924 if (iscsi_target_check_first_request(conn, login) < 0)
925 return -1;
926
927 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
928 return -1;
929
930 ret = iscsi_encode_text_output(
931 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
932 SENDER_TARGET,
933 login->rsp_buf,
934 &login->rsp_length,
935 conn->param_list,
936 conn->tpg->tpg_attrib.login_keys_workaround);
937 if (ret < 0) {
938 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
939 ISCSI_LOGIN_STATUS_INIT_ERR);
940 return -1;
941 }
942
943 if (!login->auth_complete &&
944 conn->tpg->tpg_attrib.authentication) {
945 pr_err("Initiator is requesting CSG: 1, has not been"
946 " successfully authenticated, and the Target is"
947 " enforcing iSCSI Authentication, login failed.\n");
948 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
949 ISCSI_LOGIN_STATUS_AUTH_FAILED);
950 return -1;
951 }
952
953 if (!iscsi_check_negotiated_keys(conn->param_list))
954 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
955 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
956 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
957 ISCSI_FLAG_LOGIN_TRANSIT;
958
959 return 0;
960}
961
962static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
963{
964 int pdu_count = 0;
965 struct iscsi_login_req *login_req;
966 struct iscsi_login_rsp *login_rsp;
967
968 login_req = (struct iscsi_login_req *) login->req;
969 login_rsp = (struct iscsi_login_rsp *) login->rsp;
970
971 while (1) {
972 if (++pdu_count > MAX_LOGIN_PDUS) {
973 pr_err("MAX_LOGIN_PDUS count reached.\n");
974 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
975 ISCSI_LOGIN_STATUS_TARGET_ERROR);
976 return -1;
977 }
978
979 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
980 case 0:
981 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
982 if (iscsi_target_handle_csg_zero(conn, login) < 0)
983 return -1;
984 break;
985 case 1:
986 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
987 if (iscsi_target_handle_csg_one(conn, login) < 0)
988 return -1;
989 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
990
991
992
993
994
995
996 if (iscsi_target_sk_check_close(conn))
997 return -1;
998
999 login->tsih = conn->sess->tsih;
1000 login->login_complete = 1;
1001 iscsi_target_restore_sock_callbacks(conn);
1002 if (iscsi_target_do_tx_login_io(conn,
1003 login) < 0)
1004 return -1;
1005 return 1;
1006 }
1007 break;
1008 default:
1009 pr_err("Illegal CSG: %d received from"
1010 " Initiator, protocol error.\n",
1011 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
1012 break;
1013 }
1014
1015 if (iscsi_target_do_tx_login_io(conn, login) < 0)
1016 return -1;
1017
1018 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1019 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
1020 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
1021 }
1022 break;
1023 }
1024
1025 return 0;
1026}
1027
1028static void iscsi_initiatorname_tolower(
1029 char *param_buf)
1030{
1031 char *c;
1032 u32 iqn_size = strlen(param_buf), i;
1033
1034 for (i = 0; i < iqn_size; i++) {
1035 c = ¶m_buf[i];
1036 if (!isupper(*c))
1037 continue;
1038
1039 *c = tolower(*c);
1040 }
1041}
1042
1043
1044
1045
1046int iscsi_target_locate_portal(
1047 struct iscsi_np *np,
1048 struct iscsi_conn *conn,
1049 struct iscsi_login *login)
1050{
1051 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1052 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1053 struct iscsi_session *sess = conn->sess;
1054 struct iscsi_tiqn *tiqn;
1055 struct iscsi_tpg_np *tpg_np = NULL;
1056 struct iscsi_login_req *login_req;
1057 struct se_node_acl *se_nacl;
1058 u32 payload_length, queue_depth = 0;
1059 int sessiontype = 0, ret = 0, tag_num, tag_size;
1060
1061 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1062 iscsi_target_set_sock_callbacks(conn);
1063
1064 login->np = np;
1065
1066 login_req = (struct iscsi_login_req *) login->req;
1067 payload_length = ntoh24(login_req->dlength);
1068
1069 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1070 if (!tmpbuf) {
1071 pr_err("Unable to allocate memory for tmpbuf.\n");
1072 return -1;
1073 }
1074
1075 memcpy(tmpbuf, login->req_buf, payload_length);
1076 tmpbuf[payload_length] = '\0';
1077 start = tmpbuf;
1078 end = (start + payload_length);
1079
1080
1081
1082
1083
1084 while (start < end) {
1085 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1086 ret = -1;
1087 goto out;
1088 }
1089
1090 if (!strncmp(key, "InitiatorName", 13))
1091 i_buf = value;
1092 else if (!strncmp(key, "SessionType", 11))
1093 s_buf = value;
1094 else if (!strncmp(key, "TargetName", 10))
1095 t_buf = value;
1096
1097 start += strlen(key) + strlen(value) + 2;
1098 }
1099
1100
1101
1102 if (!i_buf) {
1103 pr_err("InitiatorName key not received"
1104 " in first login request.\n");
1105 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1106 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1107 ret = -1;
1108 goto out;
1109 }
1110
1111
1112
1113
1114
1115 iscsi_initiatorname_tolower(i_buf);
1116
1117 if (!s_buf) {
1118 if (!login->leading_connection)
1119 goto get_target;
1120
1121 pr_err("SessionType key not received"
1122 " in first login request.\n");
1123 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1124 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1125 ret = -1;
1126 goto out;
1127 }
1128
1129
1130
1131
1132 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1133 if (!sessiontype) {
1134 conn->tpg = iscsit_global->discovery_tpg;
1135 if (!login->leading_connection)
1136 goto get_target;
1137
1138 sess->sess_ops->SessionType = 1;
1139
1140
1141
1142 if (iscsi_login_setup_crypto(conn) < 0) {
1143 pr_err("iscsi_login_setup_crypto() failed\n");
1144 ret = -1;
1145 goto out;
1146 }
1147
1148
1149
1150
1151 if (iscsit_access_np(np, conn->tpg) < 0) {
1152 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1153 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1154 ret = -1;
1155 goto out;
1156 }
1157 ret = 0;
1158 goto alloc_tags;
1159 }
1160
1161get_target:
1162 if (!t_buf) {
1163 pr_err("TargetName key not received"
1164 " in first login request while"
1165 " SessionType=Normal.\n");
1166 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1167 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1168 ret = -1;
1169 goto out;
1170 }
1171
1172
1173
1174
1175 tiqn = iscsit_get_tiqn_for_login(t_buf);
1176 if (!tiqn) {
1177 pr_err("Unable to locate Target IQN: %s in"
1178 " Storage Node\n", t_buf);
1179 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1180 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1181 ret = -1;
1182 goto out;
1183 }
1184 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1185
1186
1187
1188
1189 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1190 if (!conn->tpg) {
1191 pr_err("Unable to locate Target Portal Group"
1192 " on %s\n", tiqn->tiqn);
1193 iscsit_put_tiqn_for_login(tiqn);
1194 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1195 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1196 ret = -1;
1197 goto out;
1198 }
1199 conn->tpg_np = tpg_np;
1200 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1201
1202
1203
1204 if (iscsi_login_setup_crypto(conn) < 0) {
1205 pr_err("iscsi_login_setup_crypto() failed\n");
1206 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1207 iscsit_put_tiqn_for_login(tiqn);
1208 conn->tpg = NULL;
1209 ret = -1;
1210 goto out;
1211 }
1212
1213
1214
1215
1216 if (iscsit_access_np(np, conn->tpg) < 0) {
1217 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1218 iscsit_put_tiqn_for_login(tiqn);
1219 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1220 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1221 conn->tpg = NULL;
1222 ret = -1;
1223 goto out;
1224 }
1225
1226
1227
1228
1229
1230
1231 if (!login->leading_connection) {
1232 ret = 0;
1233 goto out;
1234 }
1235
1236
1237
1238
1239 sess->sess_ops->SessionType = 0;
1240
1241
1242
1243
1244 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1245 &conn->tpg->tpg_se_tpg, i_buf);
1246 if (!sess->se_sess->se_node_acl) {
1247 pr_err("iSCSI Initiator Node: %s is not authorized to"
1248 " access iSCSI target portal group: %hu.\n",
1249 i_buf, conn->tpg->tpgt);
1250 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1251 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1252 ret = -1;
1253 goto out;
1254 }
1255 se_nacl = sess->se_sess->se_node_acl;
1256 queue_depth = se_nacl->queue_depth;
1257
1258
1259
1260
1261
1262
1263
1264
1265alloc_tags:
1266 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1267 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1268 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1269
1270 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1271 if (ret < 0) {
1272 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1273 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1274 ret = -1;
1275 }
1276out:
1277 kfree(tmpbuf);
1278 return ret;
1279}
1280
1281int iscsi_target_start_negotiation(
1282 struct iscsi_login *login,
1283 struct iscsi_conn *conn)
1284{
1285 int ret;
1286
1287 if (conn->sock) {
1288 struct sock *sk = conn->sock->sk;
1289
1290 write_lock_bh(&sk->sk_callback_lock);
1291 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1292 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
1293 write_unlock_bh(&sk->sk_callback_lock);
1294 }
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304 ret = iscsi_target_do_login(conn, login);
1305 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
1306 ret = -1;
1307
1308 if (ret < 0) {
1309 cancel_delayed_work_sync(&conn->login_work);
1310 iscsi_target_restore_sock_callbacks(conn);
1311 iscsi_remove_failed_auth_entry(conn);
1312 }
1313 if (ret != 0)
1314 iscsi_target_nego_release(conn);
1315
1316 return ret;
1317}
1318
1319void iscsi_target_nego_release(struct iscsi_conn *conn)
1320{
1321 struct iscsi_login *login = conn->conn_login;
1322
1323 if (!login)
1324 return;
1325
1326 kfree(login->req_buf);
1327 kfree(login->rsp_buf);
1328 kfree(login);
1329
1330 conn->conn_login = NULL;
1331}
1332
