1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3 * This file contains main functions related to iSCSI Parameter negotiation.
4 *
5 * (c) Copyright 2007-2013 Datera, Inc.
6 *
7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 *
9 ******************************************************************************/
10
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 #define TEXT_LEN 4096
32
convert_null_to_semi(char * buf,int len)33 void convert_null_to_semi(char *buf, int len)
34 {
35 int i;
36
37 for (i = 0; i < len; i++)
38 if (buf[i] == '\0')
39 buf[i] = ';';
40 }
41
strlen_semi(char * buf)42 static int strlen_semi(char *buf)
43 {
44 int i = 0;
45
46 while (buf[i] != '\0') {
47 if (buf[i] == ';')
48 return i;
49 i++;
50 }
51
52 return -1;
53 }
54
extract_param(const char * in_buf,const char * pattern,unsigned int max_length,char * out_buf,unsigned char * type)55 int extract_param(
56 const char *in_buf,
57 const char *pattern,
58 unsigned int max_length,
59 char *out_buf,
60 unsigned char *type)
61 {
62 char *ptr;
63 int len;
64
65 if (!in_buf || !pattern || !out_buf || !type)
66 return -1;
67
68 ptr = strstr(in_buf, pattern);
69 if (!ptr)
70 return -1;
71
72 ptr = strstr(ptr, "=");
73 if (!ptr)
74 return -1;
75
76 ptr += 1;
77 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
78 ptr += 2; /* skip 0x */
79 *type = HEX;
80 } else
81 *type = DECIMAL;
82
83 len = strlen_semi(ptr);
84 if (len < 0)
85 return -1;
86
87 if (len >= max_length) {
88 pr_err("Length of input: %d exceeds max_length:"
89 " %d\n", len, max_length);
90 return -1;
91 }
92 memcpy(out_buf, ptr, len);
93 out_buf[len] = '\0';
94
95 return 0;
96 }
97
iscsi_handle_authentication(struct iscsi_conn * conn,char * in_buf,char * out_buf,int in_length,int * out_length,unsigned char * authtype)98 static u32 iscsi_handle_authentication(
99 struct iscsi_conn *conn,
100 char *in_buf,
101 char *out_buf,
102 int in_length,
103 int *out_length,
104 unsigned char *authtype)
105 {
106 struct iscsi_session *sess = conn->sess;
107 struct iscsi_node_auth *auth;
108 struct iscsi_node_acl *iscsi_nacl;
109 struct iscsi_portal_group *iscsi_tpg;
110 struct se_node_acl *se_nacl;
111
112 if (!sess->sess_ops->SessionType) {
113 /*
114 * For SessionType=Normal
115 */
116 se_nacl = conn->sess->se_sess->se_node_acl;
117 if (!se_nacl) {
118 pr_err("Unable to locate struct se_node_acl for"
119 " CHAP auth\n");
120 return -1;
121 }
122 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
123 se_node_acl);
124 if (!iscsi_nacl) {
125 pr_err("Unable to locate struct iscsi_node_acl for"
126 " CHAP auth\n");
127 return -1;
128 }
129
130 if (se_nacl->dynamic_node_acl) {
131 iscsi_tpg = container_of(se_nacl->se_tpg,
132 struct iscsi_portal_group, tpg_se_tpg);
133
134 auth = &iscsi_tpg->tpg_demo_auth;
135 } else {
136 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
137 se_node_acl);
138
139 auth = &iscsi_nacl->node_auth;
140 }
141 } else {
142 /*
143 * For SessionType=Discovery
144 */
145 auth = &iscsit_global->discovery_acl.node_auth;
146 }
147
148 if (strstr("CHAP", authtype))
149 strcpy(conn->sess->auth_type, "CHAP");
150 else
151 strcpy(conn->sess->auth_type, NONE);
152
153 if (strstr("None", authtype))
154 return 1;
155 else if (strstr("CHAP", authtype))
156 return chap_main_loop(conn, auth, in_buf, out_buf,
157 &in_length, out_length);
158 /* SRP, SPKM1, SPKM2 and KRB5 are unsupported */
159 return 2;
160 }
161
iscsi_remove_failed_auth_entry(struct iscsi_conn * conn)162 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
163 {
164 kfree(conn->auth_protocol);
165 }
166
iscsi_target_check_login_request(struct iscsi_conn * conn,struct iscsi_login * login)167 int iscsi_target_check_login_request(
168 struct iscsi_conn *conn,
169 struct iscsi_login *login)
170 {
171 int req_csg, req_nsg;
172 u32 payload_length;
173 struct iscsi_login_req *login_req;
174
175 login_req = (struct iscsi_login_req *) login->req;
176 payload_length = ntoh24(login_req->dlength);
177
178 switch (login_req->opcode & ISCSI_OPCODE_MASK) {
179 case ISCSI_OP_LOGIN:
180 break;
181 default:
182 pr_err("Received unknown opcode 0x%02x.\n",
183 login_req->opcode & ISCSI_OPCODE_MASK);
184 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
185 ISCSI_LOGIN_STATUS_INIT_ERR);
186 return -1;
187 }
188
189 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
190 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
191 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
192 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
193 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
194 ISCSI_LOGIN_STATUS_INIT_ERR);
195 return -1;
196 }
197
198 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
199 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
200
201 if (req_csg != login->current_stage) {
202 pr_err("Initiator unexpectedly changed login stage"
203 " from %d to %d, login failed.\n", login->current_stage,
204 req_csg);
205 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
206 ISCSI_LOGIN_STATUS_INIT_ERR);
207 return -1;
208 }
209
210 if ((req_nsg == 2) || (req_csg >= 2) ||
211 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
212 (req_nsg <= req_csg))) {
213 pr_err("Illegal login_req->flags Combination, CSG: %d,"
214 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
215 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
216 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
217 ISCSI_LOGIN_STATUS_INIT_ERR);
218 return -1;
219 }
220
221 if ((login_req->max_version != login->version_max) ||
222 (login_req->min_version != login->version_min)) {
223 pr_err("Login request changed Version Max/Nin"
224 " unexpectedly to 0x%02x/0x%02x, protocol error\n",
225 login_req->max_version, login_req->min_version);
226 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
227 ISCSI_LOGIN_STATUS_INIT_ERR);
228 return -1;
229 }
230
231 if (memcmp(login_req->isid, login->isid, 6) != 0) {
232 pr_err("Login request changed ISID unexpectedly,"
233 " protocol error.\n");
234 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
235 ISCSI_LOGIN_STATUS_INIT_ERR);
236 return -1;
237 }
238
239 if (login_req->itt != login->init_task_tag) {
240 pr_err("Login request changed ITT unexpectedly to"
241 " 0x%08x, protocol error.\n", login_req->itt);
242 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
243 ISCSI_LOGIN_STATUS_INIT_ERR);
244 return -1;
245 }
246
247 if (payload_length > MAX_KEY_VALUE_PAIRS) {
248 pr_err("Login request payload exceeds default"
249 " MaxRecvDataSegmentLength: %u, protocol error.\n",
250 MAX_KEY_VALUE_PAIRS);
251 return -1;
252 }
253
254 return 0;
255 }
256 EXPORT_SYMBOL(iscsi_target_check_login_request);
257
iscsi_target_check_first_request(struct iscsi_conn * conn,struct iscsi_login * login)258 static int iscsi_target_check_first_request(
259 struct iscsi_conn *conn,
260 struct iscsi_login *login)
261 {
262 struct iscsi_param *param = NULL;
263 struct se_node_acl *se_nacl;
264
265 login->first_request = 0;
266
267 list_for_each_entry(param, &conn->param_list->param_list, p_list) {
268 if (!strncmp(param->name, SESSIONTYPE, 11)) {
269 if (!IS_PSTATE_ACCEPTOR(param)) {
270 pr_err("SessionType key not received"
271 " in first login request.\n");
272 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
273 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
274 return -1;
275 }
276 if (!strncmp(param->value, DISCOVERY, 9))
277 return 0;
278 }
279
280 if (!strncmp(param->name, INITIATORNAME, 13)) {
281 if (!IS_PSTATE_ACCEPTOR(param)) {
282 if (!login->leading_connection)
283 continue;
284
285 pr_err("InitiatorName 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
292 /*
293 * For non-leading connections, double check that the
294 * received InitiatorName matches the existing session's
295 * struct iscsi_node_acl.
296 */
297 if (!login->leading_connection) {
298 se_nacl = conn->sess->se_sess->se_node_acl;
299 if (!se_nacl) {
300 pr_err("Unable to locate"
301 " struct se_node_acl\n");
302 iscsit_tx_login_rsp(conn,
303 ISCSI_STATUS_CLS_INITIATOR_ERR,
304 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
305 return -1;
306 }
307
308 if (strcmp(param->value,
309 se_nacl->initiatorname)) {
310 pr_err("Incorrect"
311 " InitiatorName: %s for this"
312 " iSCSI Initiator Node.\n",
313 param->value);
314 iscsit_tx_login_rsp(conn,
315 ISCSI_STATUS_CLS_INITIATOR_ERR,
316 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
317 return -1;
318 }
319 }
320 }
321 }
322
323 return 0;
324 }
325
iscsi_target_do_tx_login_io(struct iscsi_conn * conn,struct iscsi_login * login)326 static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
327 {
328 u32 padding = 0;
329 struct iscsi_login_rsp *login_rsp;
330
331 login_rsp = (struct iscsi_login_rsp *) login->rsp;
332
333 login_rsp->opcode = ISCSI_OP_LOGIN_RSP;
334 hton24(login_rsp->dlength, login->rsp_length);
335 memcpy(login_rsp->isid, login->isid, 6);
336 login_rsp->tsih = cpu_to_be16(login->tsih);
337 login_rsp->itt = login->init_task_tag;
338 login_rsp->statsn = cpu_to_be32(conn->stat_sn++);
339 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
340 login_rsp->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
341
342 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
343 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
344 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
345 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
346 ntohl(login_rsp->statsn), login->rsp_length);
347
348 padding = ((-login->rsp_length) & 3);
349 /*
350 * Before sending the last login response containing the transition
351 * bit for full-feature-phase, go ahead and start up TX/RX threads
352 * now to avoid potential resource allocation failures after the
353 * final login response has been sent.
354 */
355 if (login->login_complete) {
356 int rc = iscsit_start_kthreads(conn);
357 if (rc) {
358 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
359 ISCSI_LOGIN_STATUS_NO_RESOURCES);
360 return -1;
361 }
362 }
363
364 if (conn->conn_transport->iscsit_put_login_tx(conn, login,
365 login->rsp_length + padding) < 0)
366 goto err;
367
368 login->rsp_length = 0;
369
370 return 0;
371
372 err:
373 if (login->login_complete) {
374 if (conn->rx_thread && conn->rx_thread_active) {
375 send_sig(SIGINT, conn->rx_thread, 1);
376 complete(&conn->rx_login_comp);
377 kthread_stop(conn->rx_thread);
378 }
379 if (conn->tx_thread && conn->tx_thread_active) {
380 send_sig(SIGINT, conn->tx_thread, 1);
381 kthread_stop(conn->tx_thread);
382 }
383 spin_lock(&iscsit_global->ts_bitmap_lock);
384 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
385 get_order(1));
386 spin_unlock(&iscsit_global->ts_bitmap_lock);
387 }
388 return -1;
389 }
390
iscsi_target_sk_data_ready(struct sock * sk)391 static void iscsi_target_sk_data_ready(struct sock *sk)
392 {
393 struct iscsi_conn *conn = sk->sk_user_data;
394 bool rc;
395
396 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
397
398 write_lock_bh(&sk->sk_callback_lock);
399 if (!sk->sk_user_data) {
400 write_unlock_bh(&sk->sk_callback_lock);
401 return;
402 }
403 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
404 write_unlock_bh(&sk->sk_callback_lock);
405 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
406 return;
407 }
408 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
409 write_unlock_bh(&sk->sk_callback_lock);
410 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
411 return;
412 }
413 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
414 write_unlock_bh(&sk->sk_callback_lock);
415 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
416 if (iscsi_target_sk_data_ready == conn->orig_data_ready)
417 return;
418 conn->orig_data_ready(sk);
419 return;
420 }
421
422 rc = schedule_delayed_work(&conn->login_work, 0);
423 if (!rc) {
424 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
425 " got false\n");
426 }
427 write_unlock_bh(&sk->sk_callback_lock);
428 }
429
430 static void iscsi_target_sk_state_change(struct sock *);
431
iscsi_target_set_sock_callbacks(struct iscsi_conn * conn)432 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
433 {
434 struct sock *sk;
435
436 if (!conn->sock)
437 return;
438
439 sk = conn->sock->sk;
440 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
441
442 write_lock_bh(&sk->sk_callback_lock);
443 sk->sk_user_data = conn;
444 conn->orig_data_ready = sk->sk_data_ready;
445 conn->orig_state_change = sk->sk_state_change;
446 sk->sk_data_ready = iscsi_target_sk_data_ready;
447 sk->sk_state_change = iscsi_target_sk_state_change;
448 write_unlock_bh(&sk->sk_callback_lock);
449
450 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
451 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
452 }
453
iscsi_target_restore_sock_callbacks(struct iscsi_conn * conn)454 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
455 {
456 struct sock *sk;
457
458 if (!conn->sock)
459 return;
460
461 sk = conn->sock->sk;
462 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
463
464 write_lock_bh(&sk->sk_callback_lock);
465 if (!sk->sk_user_data) {
466 write_unlock_bh(&sk->sk_callback_lock);
467 return;
468 }
469 sk->sk_user_data = NULL;
470 sk->sk_data_ready = conn->orig_data_ready;
471 sk->sk_state_change = conn->orig_state_change;
472 write_unlock_bh(&sk->sk_callback_lock);
473
474 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
475 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
476 }
477
478 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
479
__iscsi_target_sk_check_close(struct sock * sk)480 static bool __iscsi_target_sk_check_close(struct sock *sk)
481 {
482 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
483 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE,"
484 "returning TRUE\n");
485 return true;
486 }
487 return false;
488 }
489
iscsi_target_sk_check_close(struct iscsi_conn * conn)490 static bool iscsi_target_sk_check_close(struct iscsi_conn *conn)
491 {
492 bool state = false;
493
494 if (conn->sock) {
495 struct sock *sk = conn->sock->sk;
496
497 read_lock_bh(&sk->sk_callback_lock);
498 state = (__iscsi_target_sk_check_close(sk) ||
499 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
500 read_unlock_bh(&sk->sk_callback_lock);
501 }
502 return state;
503 }
504
iscsi_target_sk_check_flag(struct iscsi_conn * conn,unsigned int flag)505 static bool iscsi_target_sk_check_flag(struct iscsi_conn *conn, unsigned int flag)
506 {
507 bool state = false;
508
509 if (conn->sock) {
510 struct sock *sk = conn->sock->sk;
511
512 read_lock_bh(&sk->sk_callback_lock);
513 state = test_bit(flag, &conn->login_flags);
514 read_unlock_bh(&sk->sk_callback_lock);
515 }
516 return state;
517 }
518
iscsi_target_sk_check_and_clear(struct iscsi_conn * conn,unsigned int flag)519 static bool iscsi_target_sk_check_and_clear(struct iscsi_conn *conn, unsigned int flag)
520 {
521 bool state = false;
522
523 if (conn->sock) {
524 struct sock *sk = conn->sock->sk;
525
526 write_lock_bh(&sk->sk_callback_lock);
527 state = (__iscsi_target_sk_check_close(sk) ||
528 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
529 if (!state)
530 clear_bit(flag, &conn->login_flags);
531 write_unlock_bh(&sk->sk_callback_lock);
532 }
533 return state;
534 }
535
iscsi_target_login_drop(struct iscsi_conn * conn,struct iscsi_login * login)536 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
537 {
538 bool zero_tsih = login->zero_tsih;
539
540 iscsi_remove_failed_auth_entry(conn);
541 iscsi_target_nego_release(conn);
542 iscsi_target_login_sess_out(conn, zero_tsih, true);
543 }
544
545 struct conn_timeout {
546 struct timer_list timer;
547 struct iscsi_conn *conn;
548 };
549
iscsi_target_login_timeout(struct timer_list * t)550 static void iscsi_target_login_timeout(struct timer_list *t)
551 {
552 struct conn_timeout *timeout = from_timer(timeout, t, timer);
553 struct iscsi_conn *conn = timeout->conn;
554
555 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
556
557 if (conn->login_kworker) {
558 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
559 conn->login_kworker->comm, conn->login_kworker->pid);
560 send_sig(SIGINT, conn->login_kworker, 1);
561 }
562 }
563
iscsi_target_do_login_rx(struct work_struct * work)564 static void iscsi_target_do_login_rx(struct work_struct *work)
565 {
566 struct iscsi_conn *conn = container_of(work,
567 struct iscsi_conn, login_work.work);
568 struct iscsi_login *login = conn->login;
569 struct iscsi_np *np = login->np;
570 struct iscsi_portal_group *tpg = conn->tpg;
571 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
572 struct conn_timeout timeout;
573 int rc, zero_tsih = login->zero_tsih;
574 bool state;
575
576 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
577 conn, current->comm, current->pid);
578 /*
579 * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready()
580 * before initial PDU processing in iscsi_target_start_negotiation()
581 * has completed, go ahead and retry until it's cleared.
582 *
583 * Otherwise if the TCP connection drops while this is occuring,
584 * iscsi_target_start_negotiation() will detect the failure, call
585 * cancel_delayed_work_sync(&conn->login_work), and cleanup the
586 * remaining iscsi connection resources from iscsi_np process context.
587 */
588 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) {
589 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10));
590 return;
591 }
592
593 spin_lock(&tpg->tpg_state_lock);
594 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
595 spin_unlock(&tpg->tpg_state_lock);
596
597 if (!state) {
598 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
599 goto err;
600 }
601
602 if (iscsi_target_sk_check_close(conn)) {
603 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
604 goto err;
605 }
606
607 conn->login_kworker = current;
608 allow_signal(SIGINT);
609
610 timeout.conn = conn;
611 timer_setup_on_stack(&timeout.timer, iscsi_target_login_timeout, 0);
612 mod_timer(&timeout.timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
613 pr_debug("Starting login timer for %s/%d\n", current->comm, current->pid);
614
615 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
616 del_timer_sync(&timeout.timer);
617 destroy_timer_on_stack(&timeout.timer);
618 flush_signals(current);
619 conn->login_kworker = NULL;
620
621 if (rc < 0)
622 goto err;
623
624 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
625 conn, current->comm, current->pid);
626
627 /*
628 * LOGIN_FLAGS_READ_ACTIVE is cleared so that sk_data_ready
629 * could be triggered again after this.
630 *
631 * LOGIN_FLAGS_WRITE_ACTIVE is cleared after we successfully
632 * process a login PDU, so that sk_state_chage can do login
633 * cleanup as needed if the socket is closed. If a delayed work is
634 * ongoing (LOGIN_FLAGS_WRITE_ACTIVE or LOGIN_FLAGS_READ_ACTIVE),
635 * sk_state_change will leave the cleanup to the delayed work or
636 * it will schedule a delayed work to do cleanup.
637 */
638 if (conn->sock) {
639 struct sock *sk = conn->sock->sk;
640
641 write_lock_bh(&sk->sk_callback_lock);
642 if (!test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags)) {
643 clear_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags);
644 set_bit(LOGIN_FLAGS_WRITE_ACTIVE, &conn->login_flags);
645 }
646 write_unlock_bh(&sk->sk_callback_lock);
647 }
648
649 rc = iscsi_target_do_login(conn, login);
650 if (rc < 0) {
651 goto err;
652 } else if (!rc) {
653 if (iscsi_target_sk_check_and_clear(conn,
654 LOGIN_FLAGS_WRITE_ACTIVE))
655 goto err;
656 } else if (rc == 1) {
657 cancel_delayed_work(&conn->login_work);
658 iscsi_target_nego_release(conn);
659 iscsi_post_login_handler(np, conn, zero_tsih);
660 iscsit_deaccess_np(np, tpg, tpg_np);
661 }
662 return;
663
664 err:
665 iscsi_target_restore_sock_callbacks(conn);
666 cancel_delayed_work(&conn->login_work);
667 iscsi_target_login_drop(conn, login);
668 iscsit_deaccess_np(np, tpg, tpg_np);
669 }
670
iscsi_target_sk_state_change(struct sock * sk)671 static void iscsi_target_sk_state_change(struct sock *sk)
672 {
673 struct iscsi_conn *conn;
674 void (*orig_state_change)(struct sock *);
675 bool state;
676
677 pr_debug("Entering iscsi_target_sk_state_change\n");
678
679 write_lock_bh(&sk->sk_callback_lock);
680 conn = sk->sk_user_data;
681 if (!conn) {
682 write_unlock_bh(&sk->sk_callback_lock);
683 return;
684 }
685 orig_state_change = conn->orig_state_change;
686
687 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
688 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
689 conn);
690 write_unlock_bh(&sk->sk_callback_lock);
691 orig_state_change(sk);
692 return;
693 }
694 state = __iscsi_target_sk_check_close(sk);
695 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state);
696
697 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags) ||
698 test_bit(LOGIN_FLAGS_WRITE_ACTIVE, &conn->login_flags)) {
699 pr_debug("Got LOGIN_FLAGS_{READ|WRITE}_ACTIVE=1"
700 " sk_state_change conn: %p\n", conn);
701 if (state)
702 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
703 write_unlock_bh(&sk->sk_callback_lock);
704 orig_state_change(sk);
705 return;
706 }
707 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
708 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
709 conn);
710 write_unlock_bh(&sk->sk_callback_lock);
711 orig_state_change(sk);
712 return;
713 }
714 /*
715 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED,
716 * but only queue conn->login_work -> iscsi_target_do_login_rx()
717 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared.
718 *
719 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close()
720 * will detect the dropped TCP connection from delayed workqueue context.
721 *
722 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial
723 * iscsi_target_start_negotiation() is running, iscsi_target_do_login()
724 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation()
725 * via iscsi_target_sk_check_and_clear() is responsible for detecting the
726 * dropped TCP connection in iscsi_np process context, and cleaning up
727 * the remaining iscsi connection resources.
728 */
729 if (state) {
730 pr_debug("iscsi_target_sk_state_change got failed state\n");
731 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
732 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
733 write_unlock_bh(&sk->sk_callback_lock);
734
735 orig_state_change(sk);
736
737 if (!state)
738 schedule_delayed_work(&conn->login_work, 0);
739 return;
740 }
741 write_unlock_bh(&sk->sk_callback_lock);
742
743 orig_state_change(sk);
744 }
745
746 /*
747 * NOTE: We check for existing sessions or connections AFTER the initiator
748 * has been successfully authenticated in order to protect against faked
749 * ISID/TSIH combinations.
750 */
iscsi_target_check_for_existing_instances(struct iscsi_conn * conn,struct iscsi_login * login)751 static int iscsi_target_check_for_existing_instances(
752 struct iscsi_conn *conn,
753 struct iscsi_login *login)
754 {
755 if (login->checked_for_existing)
756 return 0;
757
758 login->checked_for_existing = 1;
759
760 if (!login->tsih)
761 return iscsi_check_for_session_reinstatement(conn);
762 else
763 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
764 login->initial_exp_statsn);
765 }
766
iscsi_target_do_authentication(struct iscsi_conn * conn,struct iscsi_login * login)767 static int iscsi_target_do_authentication(
768 struct iscsi_conn *conn,
769 struct iscsi_login *login)
770 {
771 int authret;
772 u32 payload_length;
773 struct iscsi_param *param;
774 struct iscsi_login_req *login_req;
775 struct iscsi_login_rsp *login_rsp;
776
777 login_req = (struct iscsi_login_req *) login->req;
778 login_rsp = (struct iscsi_login_rsp *) login->rsp;
779 payload_length = ntoh24(login_req->dlength);
780
781 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
782 if (!param)
783 return -1;
784
785 authret = iscsi_handle_authentication(
786 conn,
787 login->req_buf,
788 login->rsp_buf,
789 payload_length,
790 &login->rsp_length,
791 param->value);
792 switch (authret) {
793 case 0:
794 pr_debug("Received OK response"
795 " from LIO Authentication, continuing.\n");
796 break;
797 case 1:
798 pr_debug("iSCSI security negotiation"
799 " completed successfully.\n");
800 login->auth_complete = 1;
801 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
802 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
803 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
804 ISCSI_FLAG_LOGIN_TRANSIT);
805 login->current_stage = 1;
806 }
807 return iscsi_target_check_for_existing_instances(
808 conn, login);
809 case 2:
810 pr_err("Security negotiation"
811 " failed.\n");
812 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
813 ISCSI_LOGIN_STATUS_AUTH_FAILED);
814 return -1;
815 default:
816 pr_err("Received unknown error %d from LIO"
817 " Authentication\n", authret);
818 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
819 ISCSI_LOGIN_STATUS_TARGET_ERROR);
820 return -1;
821 }
822
823 return 0;
824 }
825
iscsi_target_handle_csg_zero(struct iscsi_conn * conn,struct iscsi_login * login)826 static int iscsi_target_handle_csg_zero(
827 struct iscsi_conn *conn,
828 struct iscsi_login *login)
829 {
830 int ret;
831 u32 payload_length;
832 struct iscsi_param *param;
833 struct iscsi_login_req *login_req;
834 struct iscsi_login_rsp *login_rsp;
835
836 login_req = (struct iscsi_login_req *) login->req;
837 login_rsp = (struct iscsi_login_rsp *) login->rsp;
838 payload_length = ntoh24(login_req->dlength);
839
840 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
841 if (!param)
842 return -1;
843
844 ret = iscsi_decode_text_input(
845 PHASE_SECURITY|PHASE_DECLARATIVE,
846 SENDER_INITIATOR|SENDER_RECEIVER,
847 login->req_buf,
848 payload_length,
849 conn);
850 if (ret < 0)
851 return -1;
852
853 if (ret > 0) {
854 if (login->auth_complete) {
855 pr_err("Initiator has already been"
856 " successfully authenticated, but is still"
857 " sending %s keys.\n", param->value);
858 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
859 ISCSI_LOGIN_STATUS_INIT_ERR);
860 return -1;
861 }
862
863 goto do_auth;
864 } else if (!payload_length) {
865 pr_err("Initiator sent zero length security payload,"
866 " login failed\n");
867 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
868 ISCSI_LOGIN_STATUS_AUTH_FAILED);
869 return -1;
870 }
871
872 if (login->first_request)
873 if (iscsi_target_check_first_request(conn, login) < 0)
874 return -1;
875
876 ret = iscsi_encode_text_output(
877 PHASE_SECURITY|PHASE_DECLARATIVE,
878 SENDER_TARGET,
879 login->rsp_buf,
880 &login->rsp_length,
881 conn->param_list,
882 conn->tpg->tpg_attrib.login_keys_workaround);
883 if (ret < 0)
884 return -1;
885
886 if (!iscsi_check_negotiated_keys(conn->param_list)) {
887 if (conn->tpg->tpg_attrib.authentication &&
888 !strncmp(param->value, NONE, 4)) {
889 pr_err("Initiator sent AuthMethod=None but"
890 " Target is enforcing iSCSI Authentication,"
891 " login failed.\n");
892 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
893 ISCSI_LOGIN_STATUS_AUTH_FAILED);
894 return -1;
895 }
896
897 if (conn->tpg->tpg_attrib.authentication &&
898 !login->auth_complete)
899 return 0;
900
901 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
902 return 0;
903
904 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
905 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
906 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
907 ISCSI_FLAG_LOGIN_TRANSIT;
908 login->current_stage = 1;
909 }
910 }
911
912 return 0;
913 do_auth:
914 return iscsi_target_do_authentication(conn, login);
915 }
916
iscsi_target_handle_csg_one(struct iscsi_conn * conn,struct iscsi_login * login)917 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
918 {
919 int ret;
920 u32 payload_length;
921 struct iscsi_login_req *login_req;
922 struct iscsi_login_rsp *login_rsp;
923
924 login_req = (struct iscsi_login_req *) login->req;
925 login_rsp = (struct iscsi_login_rsp *) login->rsp;
926 payload_length = ntoh24(login_req->dlength);
927
928 ret = iscsi_decode_text_input(
929 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
930 SENDER_INITIATOR|SENDER_RECEIVER,
931 login->req_buf,
932 payload_length,
933 conn);
934 if (ret < 0) {
935 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
936 ISCSI_LOGIN_STATUS_INIT_ERR);
937 return -1;
938 }
939
940 if (login->first_request)
941 if (iscsi_target_check_first_request(conn, login) < 0)
942 return -1;
943
944 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
945 return -1;
946
947 ret = iscsi_encode_text_output(
948 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
949 SENDER_TARGET,
950 login->rsp_buf,
951 &login->rsp_length,
952 conn->param_list,
953 conn->tpg->tpg_attrib.login_keys_workaround);
954 if (ret < 0) {
955 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
956 ISCSI_LOGIN_STATUS_INIT_ERR);
957 return -1;
958 }
959
960 if (!login->auth_complete &&
961 conn->tpg->tpg_attrib.authentication) {
962 pr_err("Initiator is requesting CSG: 1, has not been"
963 " successfully authenticated, and the Target is"
964 " enforcing iSCSI Authentication, login failed.\n");
965 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
966 ISCSI_LOGIN_STATUS_AUTH_FAILED);
967 return -1;
968 }
969
970 if (!iscsi_check_negotiated_keys(conn->param_list))
971 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
972 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
973 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
974 ISCSI_FLAG_LOGIN_TRANSIT;
975
976 return 0;
977 }
978
iscsi_target_do_login(struct iscsi_conn * conn,struct iscsi_login * login)979 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
980 {
981 int pdu_count = 0;
982 struct iscsi_login_req *login_req;
983 struct iscsi_login_rsp *login_rsp;
984
985 login_req = (struct iscsi_login_req *) login->req;
986 login_rsp = (struct iscsi_login_rsp *) login->rsp;
987
988 while (1) {
989 if (++pdu_count > MAX_LOGIN_PDUS) {
990 pr_err("MAX_LOGIN_PDUS count reached.\n");
991 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
992 ISCSI_LOGIN_STATUS_TARGET_ERROR);
993 return -1;
994 }
995
996 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
997 case 0:
998 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
999 if (iscsi_target_handle_csg_zero(conn, login) < 0)
1000 return -1;
1001 break;
1002 case 1:
1003 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
1004 if (iscsi_target_handle_csg_one(conn, login) < 0)
1005 return -1;
1006 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1007 /*
1008 * Check to make sure the TCP connection has not
1009 * dropped asynchronously while session reinstatement
1010 * was occuring in this kthread context, before
1011 * transitioning to full feature phase operation.
1012 */
1013 if (iscsi_target_sk_check_close(conn))
1014 return -1;
1015
1016 login->tsih = conn->sess->tsih;
1017 login->login_complete = 1;
1018 iscsi_target_restore_sock_callbacks(conn);
1019 if (iscsi_target_do_tx_login_io(conn,
1020 login) < 0)
1021 return -1;
1022 return 1;
1023 }
1024 break;
1025 default:
1026 pr_err("Illegal CSG: %d received from"
1027 " Initiator, protocol error.\n",
1028 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
1029 break;
1030 }
1031
1032 if (iscsi_target_do_tx_login_io(conn, login) < 0)
1033 return -1;
1034
1035 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1036 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
1037 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
1038 }
1039 break;
1040 }
1041
1042 return 0;
1043 }
1044
iscsi_initiatorname_tolower(char * param_buf)1045 static void iscsi_initiatorname_tolower(
1046 char *param_buf)
1047 {
1048 char *c;
1049 u32 iqn_size = strlen(param_buf), i;
1050
1051 for (i = 0; i < iqn_size; i++) {
1052 c = ¶m_buf[i];
1053 if (!isupper(*c))
1054 continue;
1055
1056 *c = tolower(*c);
1057 }
1058 }
1059
1060 /*
1061 * Processes the first Login Request..
1062 */
iscsi_target_locate_portal(struct iscsi_np * np,struct iscsi_conn * conn,struct iscsi_login * login)1063 int iscsi_target_locate_portal(
1064 struct iscsi_np *np,
1065 struct iscsi_conn *conn,
1066 struct iscsi_login *login)
1067 {
1068 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1069 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1070 struct iscsi_session *sess = conn->sess;
1071 struct iscsi_tiqn *tiqn;
1072 struct iscsi_tpg_np *tpg_np = NULL;
1073 struct iscsi_login_req *login_req;
1074 struct se_node_acl *se_nacl;
1075 u32 payload_length, queue_depth = 0;
1076 int sessiontype = 0, ret = 0, tag_num, tag_size;
1077
1078 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1079 iscsi_target_set_sock_callbacks(conn);
1080
1081 login->np = np;
1082
1083 login_req = (struct iscsi_login_req *) login->req;
1084 payload_length = ntoh24(login_req->dlength);
1085
1086 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1087 if (!tmpbuf) {
1088 pr_err("Unable to allocate memory for tmpbuf.\n");
1089 return -1;
1090 }
1091
1092 memcpy(tmpbuf, login->req_buf, payload_length);
1093 tmpbuf[payload_length] = '\0';
1094 start = tmpbuf;
1095 end = (start + payload_length);
1096
1097 /*
1098 * Locate the initial keys expected from the Initiator node in
1099 * the first login request in order to progress with the login phase.
1100 */
1101 while (start < end) {
1102 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1103 ret = -1;
1104 goto out;
1105 }
1106
1107 if (!strncmp(key, "InitiatorName", 13))
1108 i_buf = value;
1109 else if (!strncmp(key, "SessionType", 11))
1110 s_buf = value;
1111 else if (!strncmp(key, "TargetName", 10))
1112 t_buf = value;
1113
1114 start += strlen(key) + strlen(value) + 2;
1115 }
1116 /*
1117 * See 5.3. Login Phase.
1118 */
1119 if (!i_buf) {
1120 pr_err("InitiatorName key not received"
1121 " in first login request.\n");
1122 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1123 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1124 ret = -1;
1125 goto out;
1126 }
1127 /*
1128 * Convert the incoming InitiatorName to lowercase following
1129 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1130 * are NOT case sensitive.
1131 */
1132 iscsi_initiatorname_tolower(i_buf);
1133
1134 if (!s_buf) {
1135 if (!login->leading_connection)
1136 goto get_target;
1137
1138 pr_err("SessionType key not received"
1139 " in first login request.\n");
1140 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1141 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1142 ret = -1;
1143 goto out;
1144 }
1145
1146 /*
1147 * Use default portal group for discovery sessions.
1148 */
1149 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1150 if (!sessiontype) {
1151 conn->tpg = iscsit_global->discovery_tpg;
1152 if (!login->leading_connection)
1153 goto get_target;
1154
1155 sess->sess_ops->SessionType = 1;
1156 /*
1157 * Setup crc32c modules from libcrypto
1158 */
1159 if (iscsi_login_setup_crypto(conn) < 0) {
1160 pr_err("iscsi_login_setup_crypto() failed\n");
1161 ret = -1;
1162 goto out;
1163 }
1164 /*
1165 * Serialize access across the discovery struct iscsi_portal_group to
1166 * process login attempt.
1167 */
1168 if (iscsit_access_np(np, conn->tpg) < 0) {
1169 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1170 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1171 ret = -1;
1172 goto out;
1173 }
1174 ret = 0;
1175 goto alloc_tags;
1176 }
1177
1178 get_target:
1179 if (!t_buf) {
1180 pr_err("TargetName key not received"
1181 " in first login request while"
1182 " SessionType=Normal.\n");
1183 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1184 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1185 ret = -1;
1186 goto out;
1187 }
1188
1189 /*
1190 * Locate Target IQN from Storage Node.
1191 */
1192 tiqn = iscsit_get_tiqn_for_login(t_buf);
1193 if (!tiqn) {
1194 pr_err("Unable to locate Target IQN: %s in"
1195 " Storage Node\n", t_buf);
1196 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1197 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1198 ret = -1;
1199 goto out;
1200 }
1201 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1202
1203 /*
1204 * Locate Target Portal Group from Storage Node.
1205 */
1206 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1207 if (!conn->tpg) {
1208 pr_err("Unable to locate Target Portal Group"
1209 " on %s\n", tiqn->tiqn);
1210 iscsit_put_tiqn_for_login(tiqn);
1211 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1212 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1213 ret = -1;
1214 goto out;
1215 }
1216 conn->tpg_np = tpg_np;
1217 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1218 /*
1219 * Setup crc32c modules from libcrypto
1220 */
1221 if (iscsi_login_setup_crypto(conn) < 0) {
1222 pr_err("iscsi_login_setup_crypto() failed\n");
1223 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1224 iscsit_put_tiqn_for_login(tiqn);
1225 conn->tpg = NULL;
1226 ret = -1;
1227 goto out;
1228 }
1229 /*
1230 * Serialize access across the struct iscsi_portal_group to
1231 * process login attempt.
1232 */
1233 if (iscsit_access_np(np, conn->tpg) < 0) {
1234 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1235 iscsit_put_tiqn_for_login(tiqn);
1236 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1237 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1238 conn->tpg = NULL;
1239 ret = -1;
1240 goto out;
1241 }
1242
1243 /*
1244 * conn->sess->node_acl will be set when the referenced
1245 * struct iscsi_session is located from received ISID+TSIH in
1246 * iscsi_login_non_zero_tsih_s2().
1247 */
1248 if (!login->leading_connection) {
1249 ret = 0;
1250 goto out;
1251 }
1252
1253 /*
1254 * This value is required in iscsi_login_zero_tsih_s2()
1255 */
1256 sess->sess_ops->SessionType = 0;
1257
1258 /*
1259 * Locate incoming Initiator IQN reference from Storage Node.
1260 */
1261 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1262 &conn->tpg->tpg_se_tpg, i_buf);
1263 if (!sess->se_sess->se_node_acl) {
1264 pr_err("iSCSI Initiator Node: %s is not authorized to"
1265 " access iSCSI target portal group: %hu.\n",
1266 i_buf, conn->tpg->tpgt);
1267 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1268 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1269 ret = -1;
1270 goto out;
1271 }
1272 se_nacl = sess->se_sess->se_node_acl;
1273 queue_depth = se_nacl->queue_depth;
1274 /*
1275 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1276 * depth for non immediate commands, plus extra tags for immediate
1277 * commands.
1278 *
1279 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1280 * in per-cpu-ida tag allocation logic + small queue_depth.
1281 */
1282 alloc_tags:
1283 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1284 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1285 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1286
1287 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1288 if (ret < 0) {
1289 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1290 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1291 ret = -1;
1292 }
1293 out:
1294 kfree(tmpbuf);
1295 return ret;
1296 }
1297
iscsi_target_start_negotiation(struct iscsi_login * login,struct iscsi_conn * conn)1298 int iscsi_target_start_negotiation(
1299 struct iscsi_login *login,
1300 struct iscsi_conn *conn)
1301 {
1302 int ret;
1303
1304 if (conn->sock) {
1305 struct sock *sk = conn->sock->sk;
1306
1307 write_lock_bh(&sk->sk_callback_lock);
1308 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1309 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
1310 write_unlock_bh(&sk->sk_callback_lock);
1311 }
1312 /*
1313 * If iscsi_target_do_login returns zero to signal more PDU
1314 * exchanges are required to complete the login, go ahead and
1315 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection
1316 * is still active.
1317 *
1318 * Otherwise if TCP connection dropped asynchronously, go ahead
1319 * and perform connection cleanup now.
1320 */
1321 ret = iscsi_target_do_login(conn, login);
1322 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
1323 ret = -1;
1324
1325 if (ret < 0) {
1326 cancel_delayed_work_sync(&conn->login_work);
1327 iscsi_target_restore_sock_callbacks(conn);
1328 iscsi_remove_failed_auth_entry(conn);
1329 }
1330 if (ret != 0)
1331 iscsi_target_nego_release(conn);
1332
1333 return ret;
1334 }
1335
iscsi_target_nego_release(struct iscsi_conn * conn)1336 void iscsi_target_nego_release(struct iscsi_conn *conn)
1337 {
1338 struct iscsi_login *login = conn->conn_login;
1339
1340 if (!login)
1341 return;
1342
1343 kfree(login->req_buf);
1344 kfree(login->rsp_buf);
1345 kfree(login);
1346
1347 conn->conn_login = NULL;
1348 }
1349
