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 <trace/events/sock.h>
17 #include <scsi/iscsi_proto.h>
18 #include <target/target_core_base.h>
19 #include <target/target_core_fabric.h>
20 #include <target/iscsi/iscsi_transport.h>
21
22 #include <target/iscsi/iscsi_target_core.h>
23 #include "iscsi_target_parameters.h"
24 #include "iscsi_target_login.h"
25 #include "iscsi_target_nego.h"
26 #include "iscsi_target_tpg.h"
27 #include "iscsi_target_util.h"
28 #include "iscsi_target.h"
29 #include "iscsi_target_auth.h"
30
31 #define MAX_LOGIN_PDUS 7
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 -EINVAL;
67
68 ptr = strstr(in_buf, pattern);
69 if (!ptr)
70 return -ENOENT;
71
72 ptr = strstr(ptr, "=");
73 if (!ptr)
74 return -EINVAL;
75
76 ptr += 1;
77 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
78 ptr += 2; /* skip 0x */
79 *type = HEX;
80 } else if (*ptr == '0' && (*(ptr+1) == 'b' || *(ptr+1) == 'B')) {
81 ptr += 2; /* skip 0b */
82 *type = BASE64;
83 } else
84 *type = DECIMAL;
85
86 len = strlen_semi(ptr);
87 if (len < 0)
88 return -EINVAL;
89
90 if (len >= max_length) {
91 pr_err("Length of input: %d exceeds max_length:"
92 " %d\n", len, max_length);
93 return -EINVAL;
94 }
95 memcpy(out_buf, ptr, len);
96 out_buf[len] = '\0';
97
98 return 0;
99 }
100
iscsi_get_node_auth(struct iscsit_conn * conn)101 static struct iscsi_node_auth *iscsi_get_node_auth(struct iscsit_conn *conn)
102 {
103 struct iscsi_portal_group *tpg;
104 struct iscsi_node_acl *nacl;
105 struct se_node_acl *se_nacl;
106
107 if (conn->sess->sess_ops->SessionType)
108 return &iscsit_global->discovery_acl.node_auth;
109
110 se_nacl = conn->sess->se_sess->se_node_acl;
111 if (!se_nacl) {
112 pr_err("Unable to locate struct se_node_acl for CHAP auth\n");
113 return NULL;
114 }
115
116 if (se_nacl->dynamic_node_acl) {
117 tpg = to_iscsi_tpg(se_nacl->se_tpg);
118 return &tpg->tpg_demo_auth;
119 }
120
121 nacl = to_iscsi_nacl(se_nacl);
122
123 return &nacl->node_auth;
124 }
125
iscsi_handle_authentication(struct iscsit_conn * conn,char * in_buf,char * out_buf,int in_length,int * out_length,unsigned char * authtype)126 static u32 iscsi_handle_authentication(
127 struct iscsit_conn *conn,
128 char *in_buf,
129 char *out_buf,
130 int in_length,
131 int *out_length,
132 unsigned char *authtype)
133 {
134 struct iscsi_node_auth *auth;
135
136 auth = iscsi_get_node_auth(conn);
137 if (!auth)
138 return -1;
139
140 if (strstr("CHAP", authtype))
141 strcpy(conn->sess->auth_type, "CHAP");
142 else
143 strcpy(conn->sess->auth_type, NONE);
144
145 if (strstr("None", authtype))
146 return 1;
147 else if (strstr("CHAP", authtype))
148 return chap_main_loop(conn, auth, in_buf, out_buf,
149 &in_length, out_length);
150 /* SRP, SPKM1, SPKM2 and KRB5 are unsupported */
151 return 2;
152 }
153
iscsi_remove_failed_auth_entry(struct iscsit_conn * conn)154 static void iscsi_remove_failed_auth_entry(struct iscsit_conn *conn)
155 {
156 kfree(conn->auth_protocol);
157 }
158
iscsi_target_check_login_request(struct iscsit_conn * conn,struct iscsi_login * login)159 int iscsi_target_check_login_request(
160 struct iscsit_conn *conn,
161 struct iscsi_login *login)
162 {
163 int req_csg, req_nsg;
164 u32 payload_length;
165 struct iscsi_login_req *login_req;
166
167 login_req = (struct iscsi_login_req *) login->req;
168 payload_length = ntoh24(login_req->dlength);
169
170 switch (login_req->opcode & ISCSI_OPCODE_MASK) {
171 case ISCSI_OP_LOGIN:
172 break;
173 default:
174 pr_err("Received unknown opcode 0x%02x.\n",
175 login_req->opcode & ISCSI_OPCODE_MASK);
176 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
177 ISCSI_LOGIN_STATUS_INIT_ERR);
178 return -1;
179 }
180
181 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
182 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
183 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
184 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
185 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
186 ISCSI_LOGIN_STATUS_INIT_ERR);
187 return -1;
188 }
189
190 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
191 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
192
193 if (req_csg != login->current_stage) {
194 pr_err("Initiator unexpectedly changed login stage"
195 " from %d to %d, login failed.\n", login->current_stage,
196 req_csg);
197 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
198 ISCSI_LOGIN_STATUS_INIT_ERR);
199 return -1;
200 }
201
202 if ((req_nsg == 2) || (req_csg >= 2) ||
203 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
204 (req_nsg <= req_csg))) {
205 pr_err("Illegal login_req->flags Combination, CSG: %d,"
206 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
207 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
208 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
209 ISCSI_LOGIN_STATUS_INIT_ERR);
210 return -1;
211 }
212
213 if ((login_req->max_version != login->version_max) ||
214 (login_req->min_version != login->version_min)) {
215 pr_err("Login request changed Version Max/Nin"
216 " unexpectedly to 0x%02x/0x%02x, protocol error\n",
217 login_req->max_version, login_req->min_version);
218 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
219 ISCSI_LOGIN_STATUS_INIT_ERR);
220 return -1;
221 }
222
223 if (memcmp(login_req->isid, login->isid, 6) != 0) {
224 pr_err("Login request changed ISID unexpectedly,"
225 " protocol error.\n");
226 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
227 ISCSI_LOGIN_STATUS_INIT_ERR);
228 return -1;
229 }
230
231 if (login_req->itt != login->init_task_tag) {
232 pr_err("Login request changed ITT unexpectedly to"
233 " 0x%08x, protocol error.\n", login_req->itt);
234 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
235 ISCSI_LOGIN_STATUS_INIT_ERR);
236 return -1;
237 }
238
239 if (payload_length > MAX_KEY_VALUE_PAIRS) {
240 pr_err("Login request payload exceeds default"
241 " MaxRecvDataSegmentLength: %u, protocol error.\n",
242 MAX_KEY_VALUE_PAIRS);
243 return -1;
244 }
245
246 return 0;
247 }
248 EXPORT_SYMBOL(iscsi_target_check_login_request);
249
iscsi_target_check_first_request(struct iscsit_conn * conn,struct iscsi_login * login)250 static int iscsi_target_check_first_request(
251 struct iscsit_conn *conn,
252 struct iscsi_login *login)
253 {
254 struct iscsi_param *param = NULL;
255 struct se_node_acl *se_nacl;
256
257 login->first_request = 0;
258
259 list_for_each_entry(param, &conn->param_list->param_list, p_list) {
260 if (!strncmp(param->name, SESSIONTYPE, 11)) {
261 if (!IS_PSTATE_ACCEPTOR(param)) {
262 pr_err("SessionType key not received"
263 " in first login request.\n");
264 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
265 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
266 return -1;
267 }
268 if (!strncmp(param->value, DISCOVERY, 9))
269 return 0;
270 }
271
272 if (!strncmp(param->name, INITIATORNAME, 13)) {
273 if (!IS_PSTATE_ACCEPTOR(param)) {
274 if (!login->leading_connection)
275 continue;
276
277 pr_err("InitiatorName key not received"
278 " in first login request.\n");
279 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
280 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
281 return -1;
282 }
283
284 /*
285 * For non-leading connections, double check that the
286 * received InitiatorName matches the existing session's
287 * struct iscsi_node_acl.
288 */
289 if (!login->leading_connection) {
290 se_nacl = conn->sess->se_sess->se_node_acl;
291 if (!se_nacl) {
292 pr_err("Unable to locate"
293 " struct se_node_acl\n");
294 iscsit_tx_login_rsp(conn,
295 ISCSI_STATUS_CLS_INITIATOR_ERR,
296 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
297 return -1;
298 }
299
300 if (strcmp(param->value,
301 se_nacl->initiatorname)) {
302 pr_err("Incorrect"
303 " InitiatorName: %s for this"
304 " iSCSI Initiator Node.\n",
305 param->value);
306 iscsit_tx_login_rsp(conn,
307 ISCSI_STATUS_CLS_INITIATOR_ERR,
308 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
309 return -1;
310 }
311 }
312 }
313 }
314
315 return 0;
316 }
317
iscsi_target_do_tx_login_io(struct iscsit_conn * conn,struct iscsi_login * login)318 static int iscsi_target_do_tx_login_io(struct iscsit_conn *conn, struct iscsi_login *login)
319 {
320 u32 padding = 0;
321 struct iscsi_login_rsp *login_rsp;
322
323 login_rsp = (struct iscsi_login_rsp *) login->rsp;
324
325 login_rsp->opcode = ISCSI_OP_LOGIN_RSP;
326 hton24(login_rsp->dlength, login->rsp_length);
327 memcpy(login_rsp->isid, login->isid, 6);
328 login_rsp->tsih = cpu_to_be16(login->tsih);
329 login_rsp->itt = login->init_task_tag;
330 login_rsp->statsn = cpu_to_be32(conn->stat_sn++);
331 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
332 login_rsp->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
333
334 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
335 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
336 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
337 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
338 ntohl(login_rsp->statsn), login->rsp_length);
339
340 padding = ((-login->rsp_length) & 3);
341 /*
342 * Before sending the last login response containing the transition
343 * bit for full-feature-phase, go ahead and start up TX/RX threads
344 * now to avoid potential resource allocation failures after the
345 * final login response has been sent.
346 */
347 if (login->login_complete) {
348 int rc = iscsit_start_kthreads(conn);
349 if (rc) {
350 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
351 ISCSI_LOGIN_STATUS_NO_RESOURCES);
352 return -1;
353 }
354 }
355
356 if (conn->conn_transport->iscsit_put_login_tx(conn, login,
357 login->rsp_length + padding) < 0)
358 goto err;
359
360 login->rsp_length = 0;
361
362 return 0;
363
364 err:
365 if (login->login_complete) {
366 if (conn->rx_thread && conn->rx_thread_active) {
367 send_sig(SIGINT, conn->rx_thread, 1);
368 complete(&conn->rx_login_comp);
369 kthread_stop(conn->rx_thread);
370 }
371 if (conn->tx_thread && conn->tx_thread_active) {
372 send_sig(SIGINT, conn->tx_thread, 1);
373 kthread_stop(conn->tx_thread);
374 }
375 spin_lock(&iscsit_global->ts_bitmap_lock);
376 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
377 get_order(1));
378 spin_unlock(&iscsit_global->ts_bitmap_lock);
379 }
380 return -1;
381 }
382
iscsi_target_sk_data_ready(struct sock * sk)383 static void iscsi_target_sk_data_ready(struct sock *sk)
384 {
385 struct iscsit_conn *conn = sk->sk_user_data;
386 bool rc;
387
388 trace_sk_data_ready(sk);
389 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
390
391 write_lock_bh(&sk->sk_callback_lock);
392 if (!sk->sk_user_data) {
393 write_unlock_bh(&sk->sk_callback_lock);
394 return;
395 }
396 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
397 write_unlock_bh(&sk->sk_callback_lock);
398 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
399 return;
400 }
401 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
402 write_unlock_bh(&sk->sk_callback_lock);
403 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
404 return;
405 }
406 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
407 write_unlock_bh(&sk->sk_callback_lock);
408 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
409 if (iscsi_target_sk_data_ready == conn->orig_data_ready)
410 return;
411 conn->orig_data_ready(sk);
412 return;
413 }
414
415 rc = schedule_delayed_work(&conn->login_work, 0);
416 if (!rc) {
417 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
418 " got false\n");
419 }
420 write_unlock_bh(&sk->sk_callback_lock);
421 }
422
423 static void iscsi_target_sk_state_change(struct sock *);
424
iscsi_target_set_sock_callbacks(struct iscsit_conn * conn)425 static void iscsi_target_set_sock_callbacks(struct iscsit_conn *conn)
426 {
427 struct sock *sk;
428
429 if (!conn->sock)
430 return;
431
432 sk = conn->sock->sk;
433 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
434
435 write_lock_bh(&sk->sk_callback_lock);
436 sk->sk_user_data = conn;
437 conn->orig_data_ready = sk->sk_data_ready;
438 conn->orig_state_change = sk->sk_state_change;
439 sk->sk_data_ready = iscsi_target_sk_data_ready;
440 sk->sk_state_change = iscsi_target_sk_state_change;
441 write_unlock_bh(&sk->sk_callback_lock);
442
443 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
444 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
445 }
446
iscsi_target_restore_sock_callbacks(struct iscsit_conn * conn)447 static void iscsi_target_restore_sock_callbacks(struct iscsit_conn *conn)
448 {
449 struct sock *sk;
450
451 if (!conn->sock)
452 return;
453
454 sk = conn->sock->sk;
455 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
456
457 write_lock_bh(&sk->sk_callback_lock);
458 if (!sk->sk_user_data) {
459 write_unlock_bh(&sk->sk_callback_lock);
460 return;
461 }
462 sk->sk_user_data = NULL;
463 sk->sk_data_ready = conn->orig_data_ready;
464 sk->sk_state_change = conn->orig_state_change;
465 write_unlock_bh(&sk->sk_callback_lock);
466
467 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
468 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
469 }
470
471 static int iscsi_target_do_login(struct iscsit_conn *, struct iscsi_login *);
472
__iscsi_target_sk_check_close(struct sock * sk)473 static bool __iscsi_target_sk_check_close(struct sock *sk)
474 {
475 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
476 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE,"
477 "returning TRUE\n");
478 return true;
479 }
480 return false;
481 }
482
iscsi_target_sk_check_close(struct iscsit_conn * conn)483 static bool iscsi_target_sk_check_close(struct iscsit_conn *conn)
484 {
485 bool state = false;
486
487 if (conn->sock) {
488 struct sock *sk = conn->sock->sk;
489
490 read_lock_bh(&sk->sk_callback_lock);
491 state = (__iscsi_target_sk_check_close(sk) ||
492 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
493 read_unlock_bh(&sk->sk_callback_lock);
494 }
495 return state;
496 }
497
iscsi_target_sk_check_flag(struct iscsit_conn * conn,unsigned int flag)498 static bool iscsi_target_sk_check_flag(struct iscsit_conn *conn, unsigned int flag)
499 {
500 bool state = false;
501
502 if (conn->sock) {
503 struct sock *sk = conn->sock->sk;
504
505 read_lock_bh(&sk->sk_callback_lock);
506 state = test_bit(flag, &conn->login_flags);
507 read_unlock_bh(&sk->sk_callback_lock);
508 }
509 return state;
510 }
511
iscsi_target_sk_check_and_clear(struct iscsit_conn * conn,unsigned int flag)512 static bool iscsi_target_sk_check_and_clear(struct iscsit_conn *conn, unsigned int flag)
513 {
514 bool state = false;
515
516 if (conn->sock) {
517 struct sock *sk = conn->sock->sk;
518
519 write_lock_bh(&sk->sk_callback_lock);
520 state = (__iscsi_target_sk_check_close(sk) ||
521 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
522 if (!state)
523 clear_bit(flag, &conn->login_flags);
524 write_unlock_bh(&sk->sk_callback_lock);
525 }
526 return state;
527 }
528
iscsi_target_login_drop(struct iscsit_conn * conn,struct iscsi_login * login)529 static void iscsi_target_login_drop(struct iscsit_conn *conn, struct iscsi_login *login)
530 {
531 bool zero_tsih = login->zero_tsih;
532
533 iscsi_remove_failed_auth_entry(conn);
534 iscsi_target_nego_release(conn);
535 iscsi_target_login_sess_out(conn, zero_tsih, true);
536 }
537
538 struct conn_timeout {
539 struct timer_list timer;
540 struct iscsit_conn *conn;
541 };
542
iscsi_target_login_timeout(struct timer_list * t)543 static void iscsi_target_login_timeout(struct timer_list *t)
544 {
545 struct conn_timeout *timeout = from_timer(timeout, t, timer);
546 struct iscsit_conn *conn = timeout->conn;
547
548 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
549
550 if (conn->login_kworker) {
551 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
552 conn->login_kworker->comm, conn->login_kworker->pid);
553 send_sig(SIGINT, conn->login_kworker, 1);
554 }
555 }
556
iscsi_target_do_login_rx(struct work_struct * work)557 static void iscsi_target_do_login_rx(struct work_struct *work)
558 {
559 struct iscsit_conn *conn = container_of(work,
560 struct iscsit_conn, login_work.work);
561 struct iscsi_login *login = conn->login;
562 struct iscsi_np *np = login->np;
563 struct iscsi_portal_group *tpg = conn->tpg;
564 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
565 struct conn_timeout timeout;
566 int rc, zero_tsih = login->zero_tsih;
567 bool state;
568
569 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
570 conn, current->comm, current->pid);
571 /*
572 * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready()
573 * before initial PDU processing in iscsi_target_start_negotiation()
574 * has completed, go ahead and retry until it's cleared.
575 *
576 * Otherwise if the TCP connection drops while this is occuring,
577 * iscsi_target_start_negotiation() will detect the failure, call
578 * cancel_delayed_work_sync(&conn->login_work), and cleanup the
579 * remaining iscsi connection resources from iscsi_np process context.
580 */
581 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) {
582 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10));
583 return;
584 }
585
586 spin_lock(&tpg->tpg_state_lock);
587 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
588 spin_unlock(&tpg->tpg_state_lock);
589
590 if (!state) {
591 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
592 goto err;
593 }
594
595 if (iscsi_target_sk_check_close(conn)) {
596 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
597 goto err;
598 }
599
600 conn->login_kworker = current;
601 allow_signal(SIGINT);
602
603 timeout.conn = conn;
604 timer_setup_on_stack(&timeout.timer, iscsi_target_login_timeout, 0);
605 mod_timer(&timeout.timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
606 pr_debug("Starting login timer for %s/%d\n", current->comm, current->pid);
607
608 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
609 del_timer_sync(&timeout.timer);
610 destroy_timer_on_stack(&timeout.timer);
611 flush_signals(current);
612 conn->login_kworker = NULL;
613
614 if (rc < 0)
615 goto err;
616
617 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
618 conn, current->comm, current->pid);
619
620 /*
621 * LOGIN_FLAGS_READ_ACTIVE is cleared so that sk_data_ready
622 * could be triggered again after this.
623 *
624 * LOGIN_FLAGS_WRITE_ACTIVE is cleared after we successfully
625 * process a login PDU, so that sk_state_chage can do login
626 * cleanup as needed if the socket is closed. If a delayed work is
627 * ongoing (LOGIN_FLAGS_WRITE_ACTIVE or LOGIN_FLAGS_READ_ACTIVE),
628 * sk_state_change will leave the cleanup to the delayed work or
629 * it will schedule a delayed work to do cleanup.
630 */
631 if (conn->sock) {
632 struct sock *sk = conn->sock->sk;
633
634 write_lock_bh(&sk->sk_callback_lock);
635 if (!test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags)) {
636 clear_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags);
637 set_bit(LOGIN_FLAGS_WRITE_ACTIVE, &conn->login_flags);
638 }
639 write_unlock_bh(&sk->sk_callback_lock);
640 }
641
642 rc = iscsi_target_do_login(conn, login);
643 if (rc < 0) {
644 goto err;
645 } else if (!rc) {
646 if (iscsi_target_sk_check_and_clear(conn,
647 LOGIN_FLAGS_WRITE_ACTIVE))
648 goto err;
649 } else if (rc == 1) {
650 cancel_delayed_work(&conn->login_work);
651 iscsi_target_nego_release(conn);
652 iscsi_post_login_handler(np, conn, zero_tsih);
653 iscsit_deaccess_np(np, tpg, tpg_np);
654 }
655 return;
656
657 err:
658 iscsi_target_restore_sock_callbacks(conn);
659 cancel_delayed_work(&conn->login_work);
660 iscsi_target_login_drop(conn, login);
661 iscsit_deaccess_np(np, tpg, tpg_np);
662 }
663
iscsi_target_sk_state_change(struct sock * sk)664 static void iscsi_target_sk_state_change(struct sock *sk)
665 {
666 struct iscsit_conn *conn;
667 void (*orig_state_change)(struct sock *);
668 bool state;
669
670 pr_debug("Entering iscsi_target_sk_state_change\n");
671
672 write_lock_bh(&sk->sk_callback_lock);
673 conn = sk->sk_user_data;
674 if (!conn) {
675 write_unlock_bh(&sk->sk_callback_lock);
676 return;
677 }
678 orig_state_change = conn->orig_state_change;
679
680 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
681 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
682 conn);
683 write_unlock_bh(&sk->sk_callback_lock);
684 orig_state_change(sk);
685 return;
686 }
687 state = __iscsi_target_sk_check_close(sk);
688 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state);
689
690 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags) ||
691 test_bit(LOGIN_FLAGS_WRITE_ACTIVE, &conn->login_flags)) {
692 pr_debug("Got LOGIN_FLAGS_{READ|WRITE}_ACTIVE=1"
693 " sk_state_change conn: %p\n", conn);
694 if (state)
695 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
696 write_unlock_bh(&sk->sk_callback_lock);
697 orig_state_change(sk);
698 return;
699 }
700 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
701 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
702 conn);
703 write_unlock_bh(&sk->sk_callback_lock);
704 orig_state_change(sk);
705 return;
706 }
707 /*
708 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED,
709 * but only queue conn->login_work -> iscsi_target_do_login_rx()
710 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared.
711 *
712 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close()
713 * will detect the dropped TCP connection from delayed workqueue context.
714 *
715 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial
716 * iscsi_target_start_negotiation() is running, iscsi_target_do_login()
717 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation()
718 * via iscsi_target_sk_check_and_clear() is responsible for detecting the
719 * dropped TCP connection in iscsi_np process context, and cleaning up
720 * the remaining iscsi connection resources.
721 */
722 if (state) {
723 pr_debug("iscsi_target_sk_state_change got failed state\n");
724 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
725 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
726 write_unlock_bh(&sk->sk_callback_lock);
727
728 orig_state_change(sk);
729
730 if (!state)
731 schedule_delayed_work(&conn->login_work, 0);
732 return;
733 }
734 write_unlock_bh(&sk->sk_callback_lock);
735
736 orig_state_change(sk);
737 }
738
739 /*
740 * NOTE: We check for existing sessions or connections AFTER the initiator
741 * has been successfully authenticated in order to protect against faked
742 * ISID/TSIH combinations.
743 */
iscsi_target_check_for_existing_instances(struct iscsit_conn * conn,struct iscsi_login * login)744 static int iscsi_target_check_for_existing_instances(
745 struct iscsit_conn *conn,
746 struct iscsi_login *login)
747 {
748 if (login->checked_for_existing)
749 return 0;
750
751 login->checked_for_existing = 1;
752
753 if (!login->tsih)
754 return iscsi_check_for_session_reinstatement(conn);
755 else
756 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
757 login->initial_exp_statsn);
758 }
759
iscsi_target_do_authentication(struct iscsit_conn * conn,struct iscsi_login * login)760 static int iscsi_target_do_authentication(
761 struct iscsit_conn *conn,
762 struct iscsi_login *login)
763 {
764 int authret;
765 u32 payload_length;
766 struct iscsi_param *param;
767 struct iscsi_login_req *login_req;
768 struct iscsi_login_rsp *login_rsp;
769
770 login_req = (struct iscsi_login_req *) login->req;
771 login_rsp = (struct iscsi_login_rsp *) login->rsp;
772 payload_length = ntoh24(login_req->dlength);
773
774 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
775 if (!param)
776 return -1;
777
778 authret = iscsi_handle_authentication(
779 conn,
780 login->req_buf,
781 login->rsp_buf,
782 payload_length,
783 &login->rsp_length,
784 param->value);
785 switch (authret) {
786 case 0:
787 pr_debug("Received OK response"
788 " from LIO Authentication, continuing.\n");
789 break;
790 case 1:
791 pr_debug("iSCSI security negotiation"
792 " completed successfully.\n");
793 login->auth_complete = 1;
794 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
795 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
796 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
797 ISCSI_FLAG_LOGIN_TRANSIT);
798 login->current_stage = 1;
799 }
800 return iscsi_target_check_for_existing_instances(
801 conn, login);
802 case 2:
803 pr_err("Security negotiation"
804 " failed.\n");
805 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
806 ISCSI_LOGIN_STATUS_AUTH_FAILED);
807 return -1;
808 default:
809 pr_err("Received unknown error %d from LIO"
810 " Authentication\n", authret);
811 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
812 ISCSI_LOGIN_STATUS_TARGET_ERROR);
813 return -1;
814 }
815
816 return 0;
817 }
818
iscsi_conn_auth_required(struct iscsit_conn * conn)819 bool iscsi_conn_auth_required(struct iscsit_conn *conn)
820 {
821 struct iscsi_node_acl *nacl;
822 struct se_node_acl *se_nacl;
823
824 if (conn->sess->sess_ops->SessionType) {
825 /*
826 * For SessionType=Discovery
827 */
828 return conn->tpg->tpg_attrib.authentication;
829 }
830 /*
831 * For SessionType=Normal
832 */
833 se_nacl = conn->sess->se_sess->se_node_acl;
834 if (!se_nacl) {
835 pr_debug("Unknown ACL is trying to connect\n");
836 return true;
837 }
838
839 if (se_nacl->dynamic_node_acl) {
840 pr_debug("Dynamic ACL %s is trying to connect\n",
841 se_nacl->initiatorname);
842 return conn->tpg->tpg_attrib.authentication;
843 }
844
845 pr_debug("Known ACL %s is trying to connect\n",
846 se_nacl->initiatorname);
847
848 nacl = to_iscsi_nacl(se_nacl);
849 if (nacl->node_attrib.authentication == NA_AUTHENTICATION_INHERITED)
850 return conn->tpg->tpg_attrib.authentication;
851
852 return nacl->node_attrib.authentication;
853 }
854
iscsi_target_handle_csg_zero(struct iscsit_conn * conn,struct iscsi_login * login)855 static int iscsi_target_handle_csg_zero(
856 struct iscsit_conn *conn,
857 struct iscsi_login *login)
858 {
859 int ret;
860 u32 payload_length;
861 struct iscsi_param *param;
862 struct iscsi_login_req *login_req;
863 struct iscsi_login_rsp *login_rsp;
864
865 login_req = (struct iscsi_login_req *) login->req;
866 login_rsp = (struct iscsi_login_rsp *) login->rsp;
867 payload_length = ntoh24(login_req->dlength);
868
869 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
870 if (!param)
871 return -1;
872
873 ret = iscsi_decode_text_input(
874 PHASE_SECURITY|PHASE_DECLARATIVE,
875 SENDER_INITIATOR|SENDER_RECEIVER,
876 login->req_buf,
877 payload_length,
878 conn);
879 if (ret < 0)
880 return -1;
881
882 if (ret > 0) {
883 if (login->auth_complete) {
884 pr_err("Initiator has already been"
885 " successfully authenticated, but is still"
886 " sending %s keys.\n", param->value);
887 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
888 ISCSI_LOGIN_STATUS_INIT_ERR);
889 return -1;
890 }
891
892 goto do_auth;
893 } else if (!payload_length) {
894 pr_err("Initiator sent zero length security payload,"
895 " login failed\n");
896 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
897 ISCSI_LOGIN_STATUS_AUTH_FAILED);
898 return -1;
899 }
900
901 if (login->first_request)
902 if (iscsi_target_check_first_request(conn, login) < 0)
903 return -1;
904
905 ret = iscsi_encode_text_output(
906 PHASE_SECURITY|PHASE_DECLARATIVE,
907 SENDER_TARGET,
908 login->rsp_buf,
909 &login->rsp_length,
910 conn->param_list,
911 conn->tpg->tpg_attrib.login_keys_workaround);
912 if (ret < 0)
913 return -1;
914
915 if (!iscsi_check_negotiated_keys(conn->param_list)) {
916 bool auth_required = iscsi_conn_auth_required(conn);
917
918 if (auth_required) {
919 if (!strncmp(param->value, NONE, 4)) {
920 pr_err("Initiator sent AuthMethod=None but"
921 " Target is enforcing iSCSI Authentication,"
922 " login failed.\n");
923 iscsit_tx_login_rsp(conn,
924 ISCSI_STATUS_CLS_INITIATOR_ERR,
925 ISCSI_LOGIN_STATUS_AUTH_FAILED);
926 return -1;
927 }
928
929 if (!login->auth_complete)
930 return 0;
931
932 if (strncmp(param->value, NONE, 4) &&
933 !login->auth_complete)
934 return 0;
935 }
936
937 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
938 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
939 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
940 ISCSI_FLAG_LOGIN_TRANSIT;
941 login->current_stage = 1;
942 }
943 }
944
945 return 0;
946 do_auth:
947 return iscsi_target_do_authentication(conn, login);
948 }
949
iscsi_conn_authenticated(struct iscsit_conn * conn,struct iscsi_login * login)950 static bool iscsi_conn_authenticated(struct iscsit_conn *conn,
951 struct iscsi_login *login)
952 {
953 if (!iscsi_conn_auth_required(conn))
954 return true;
955
956 if (login->auth_complete)
957 return true;
958
959 return false;
960 }
961
iscsi_target_handle_csg_one(struct iscsit_conn * conn,struct iscsi_login * login)962 static int iscsi_target_handle_csg_one(struct iscsit_conn *conn, struct iscsi_login *login)
963 {
964 int ret;
965 u32 payload_length;
966 struct iscsi_login_req *login_req;
967 struct iscsi_login_rsp *login_rsp;
968
969 login_req = (struct iscsi_login_req *) login->req;
970 login_rsp = (struct iscsi_login_rsp *) login->rsp;
971 payload_length = ntoh24(login_req->dlength);
972
973 ret = iscsi_decode_text_input(
974 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
975 SENDER_INITIATOR|SENDER_RECEIVER,
976 login->req_buf,
977 payload_length,
978 conn);
979 if (ret < 0) {
980 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
981 ISCSI_LOGIN_STATUS_INIT_ERR);
982 return -1;
983 }
984
985 if (login->first_request)
986 if (iscsi_target_check_first_request(conn, login) < 0)
987 return -1;
988
989 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
990 return -1;
991
992 ret = iscsi_encode_text_output(
993 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
994 SENDER_TARGET,
995 login->rsp_buf,
996 &login->rsp_length,
997 conn->param_list,
998 conn->tpg->tpg_attrib.login_keys_workaround);
999 if (ret < 0) {
1000 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1001 ISCSI_LOGIN_STATUS_INIT_ERR);
1002 return -1;
1003 }
1004
1005 if (!iscsi_conn_authenticated(conn, login)) {
1006 pr_err("Initiator is requesting CSG: 1, has not been"
1007 " successfully authenticated, and the Target is"
1008 " enforcing iSCSI Authentication, login failed.\n");
1009 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1010 ISCSI_LOGIN_STATUS_AUTH_FAILED);
1011 return -1;
1012 }
1013
1014 if (!iscsi_check_negotiated_keys(conn->param_list))
1015 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
1016 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
1017 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
1018 ISCSI_FLAG_LOGIN_TRANSIT;
1019
1020 return 0;
1021 }
1022
1023 /*
1024 * RETURN VALUE:
1025 *
1026 * 1 = Login successful
1027 * -1 = Login failed
1028 * 0 = More PDU exchanges required
1029 */
iscsi_target_do_login(struct iscsit_conn * conn,struct iscsi_login * login)1030 static int iscsi_target_do_login(struct iscsit_conn *conn, struct iscsi_login *login)
1031 {
1032 int pdu_count = 0;
1033 struct iscsi_login_req *login_req;
1034 struct iscsi_login_rsp *login_rsp;
1035
1036 login_req = (struct iscsi_login_req *) login->req;
1037 login_rsp = (struct iscsi_login_rsp *) login->rsp;
1038
1039 while (1) {
1040 if (++pdu_count > MAX_LOGIN_PDUS) {
1041 pr_err("MAX_LOGIN_PDUS count reached.\n");
1042 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1043 ISCSI_LOGIN_STATUS_TARGET_ERROR);
1044 return -1;
1045 }
1046
1047 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
1048 case 0:
1049 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
1050 if (iscsi_target_handle_csg_zero(conn, login) < 0)
1051 return -1;
1052 break;
1053 case 1:
1054 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
1055 if (iscsi_target_handle_csg_one(conn, login) < 0)
1056 return -1;
1057 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1058 /*
1059 * Check to make sure the TCP connection has not
1060 * dropped asynchronously while session reinstatement
1061 * was occuring in this kthread context, before
1062 * transitioning to full feature phase operation.
1063 */
1064 if (iscsi_target_sk_check_close(conn))
1065 return -1;
1066
1067 login->tsih = conn->sess->tsih;
1068 login->login_complete = 1;
1069 iscsi_target_restore_sock_callbacks(conn);
1070 if (iscsi_target_do_tx_login_io(conn,
1071 login) < 0)
1072 return -1;
1073 return 1;
1074 }
1075 break;
1076 default:
1077 pr_err("Illegal CSG: %d received from"
1078 " Initiator, protocol error.\n",
1079 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
1080 break;
1081 }
1082
1083 if (iscsi_target_do_tx_login_io(conn, login) < 0)
1084 return -1;
1085
1086 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1087 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
1088 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
1089 }
1090 break;
1091 }
1092
1093 return 0;
1094 }
1095
iscsi_initiatorname_tolower(char * param_buf)1096 static void iscsi_initiatorname_tolower(
1097 char *param_buf)
1098 {
1099 char *c;
1100 u32 iqn_size = strlen(param_buf), i;
1101
1102 for (i = 0; i < iqn_size; i++) {
1103 c = ¶m_buf[i];
1104 if (!isupper(*c))
1105 continue;
1106
1107 *c = tolower(*c);
1108 }
1109 }
1110
1111 /*
1112 * Processes the first Login Request..
1113 */
iscsi_target_locate_portal(struct iscsi_np * np,struct iscsit_conn * conn,struct iscsi_login * login)1114 int iscsi_target_locate_portal(
1115 struct iscsi_np *np,
1116 struct iscsit_conn *conn,
1117 struct iscsi_login *login)
1118 {
1119 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1120 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1121 struct iscsit_session *sess = conn->sess;
1122 struct iscsi_tiqn *tiqn;
1123 struct iscsi_tpg_np *tpg_np = NULL;
1124 struct iscsi_login_req *login_req;
1125 struct se_node_acl *se_nacl;
1126 u32 payload_length, queue_depth = 0;
1127 int sessiontype = 0, ret = 0, tag_num, tag_size;
1128
1129 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1130 iscsi_target_set_sock_callbacks(conn);
1131
1132 login->np = np;
1133
1134 login_req = (struct iscsi_login_req *) login->req;
1135 payload_length = ntoh24(login_req->dlength);
1136
1137 tmpbuf = kmemdup_nul(login->req_buf, payload_length, GFP_KERNEL);
1138 if (!tmpbuf) {
1139 pr_err("Unable to allocate memory for tmpbuf.\n");
1140 return -1;
1141 }
1142
1143 start = tmpbuf;
1144 end = (start + payload_length);
1145
1146 /*
1147 * Locate the initial keys expected from the Initiator node in
1148 * the first login request in order to progress with the login phase.
1149 */
1150 while (start < end) {
1151 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1152 ret = -1;
1153 goto out;
1154 }
1155
1156 if (!strncmp(key, "InitiatorName", 13))
1157 i_buf = value;
1158 else if (!strncmp(key, "SessionType", 11))
1159 s_buf = value;
1160 else if (!strncmp(key, "TargetName", 10))
1161 t_buf = value;
1162
1163 start += strlen(key) + strlen(value) + 2;
1164 }
1165 /*
1166 * See 5.3. Login Phase.
1167 */
1168 if (!i_buf) {
1169 pr_err("InitiatorName key not received"
1170 " in first login request.\n");
1171 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1172 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1173 ret = -1;
1174 goto out;
1175 }
1176 /*
1177 * Convert the incoming InitiatorName to lowercase following
1178 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1179 * are NOT case sensitive.
1180 */
1181 iscsi_initiatorname_tolower(i_buf);
1182
1183 if (!s_buf) {
1184 if (!login->leading_connection)
1185 goto get_target;
1186
1187 pr_err("SessionType key not received"
1188 " in first login request.\n");
1189 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1190 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1191 ret = -1;
1192 goto out;
1193 }
1194
1195 /*
1196 * Use default portal group for discovery sessions.
1197 */
1198 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1199 if (!sessiontype) {
1200 conn->tpg = iscsit_global->discovery_tpg;
1201 if (!login->leading_connection)
1202 goto get_target;
1203
1204 sess->sess_ops->SessionType = 1;
1205 /*
1206 * Setup crc32c modules from libcrypto
1207 */
1208 if (iscsi_login_setup_crypto(conn) < 0) {
1209 pr_err("iscsi_login_setup_crypto() failed\n");
1210 ret = -1;
1211 goto out;
1212 }
1213 /*
1214 * Serialize access across the discovery struct iscsi_portal_group to
1215 * process login attempt.
1216 */
1217 if (iscsit_access_np(np, conn->tpg) < 0) {
1218 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1219 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1220 ret = -1;
1221 goto out;
1222 }
1223 ret = 0;
1224 goto alloc_tags;
1225 }
1226
1227 get_target:
1228 if (!t_buf) {
1229 pr_err("TargetName key not received"
1230 " in first login request while"
1231 " SessionType=Normal.\n");
1232 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1233 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1234 ret = -1;
1235 goto out;
1236 }
1237
1238 /*
1239 * Locate Target IQN from Storage Node.
1240 */
1241 tiqn = iscsit_get_tiqn_for_login(t_buf);
1242 if (!tiqn) {
1243 pr_err("Unable to locate Target IQN: %s in"
1244 " Storage Node\n", t_buf);
1245 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1246 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1247 ret = -1;
1248 goto out;
1249 }
1250 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1251
1252 /*
1253 * Locate Target Portal Group from Storage Node.
1254 */
1255 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1256 if (!conn->tpg) {
1257 pr_err("Unable to locate Target Portal Group"
1258 " on %s\n", tiqn->tiqn);
1259 iscsit_put_tiqn_for_login(tiqn);
1260 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1261 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1262 ret = -1;
1263 goto out;
1264 }
1265 conn->tpg_np = tpg_np;
1266 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1267 /*
1268 * Setup crc32c modules from libcrypto
1269 */
1270 if (iscsi_login_setup_crypto(conn) < 0) {
1271 pr_err("iscsi_login_setup_crypto() failed\n");
1272 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1273 iscsit_put_tiqn_for_login(tiqn);
1274 conn->tpg = NULL;
1275 ret = -1;
1276 goto out;
1277 }
1278 /*
1279 * Serialize access across the struct iscsi_portal_group to
1280 * process login attempt.
1281 */
1282 if (iscsit_access_np(np, conn->tpg) < 0) {
1283 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1284 iscsit_put_tiqn_for_login(tiqn);
1285 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1286 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1287 conn->tpg = NULL;
1288 ret = -1;
1289 goto out;
1290 }
1291
1292 /*
1293 * conn->sess->node_acl will be set when the referenced
1294 * struct iscsit_session is located from received ISID+TSIH in
1295 * iscsi_login_non_zero_tsih_s2().
1296 */
1297 if (!login->leading_connection) {
1298 ret = 0;
1299 goto out;
1300 }
1301
1302 /*
1303 * This value is required in iscsi_login_zero_tsih_s2()
1304 */
1305 sess->sess_ops->SessionType = 0;
1306
1307 /*
1308 * Locate incoming Initiator IQN reference from Storage Node.
1309 */
1310 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1311 &conn->tpg->tpg_se_tpg, i_buf);
1312 if (!sess->se_sess->se_node_acl) {
1313 pr_err("iSCSI Initiator Node: %s is not authorized to"
1314 " access iSCSI target portal group: %hu.\n",
1315 i_buf, conn->tpg->tpgt);
1316 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1317 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1318 ret = -1;
1319 goto out;
1320 }
1321 se_nacl = sess->se_sess->se_node_acl;
1322 queue_depth = se_nacl->queue_depth;
1323 /*
1324 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1325 * depth for non immediate commands, plus extra tags for immediate
1326 * commands.
1327 *
1328 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1329 * in per-cpu-ida tag allocation logic + small queue_depth.
1330 */
1331 alloc_tags:
1332 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1333 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1334 tag_size = sizeof(struct iscsit_cmd) + conn->conn_transport->priv_size;
1335
1336 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1337 if (ret < 0) {
1338 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1339 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1340 ret = -1;
1341 }
1342 out:
1343 kfree(tmpbuf);
1344 return ret;
1345 }
1346
iscsi_target_start_negotiation(struct iscsi_login * login,struct iscsit_conn * conn)1347 int iscsi_target_start_negotiation(
1348 struct iscsi_login *login,
1349 struct iscsit_conn *conn)
1350 {
1351 int ret;
1352
1353 if (conn->sock) {
1354 struct sock *sk = conn->sock->sk;
1355
1356 write_lock_bh(&sk->sk_callback_lock);
1357 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1358 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
1359 write_unlock_bh(&sk->sk_callback_lock);
1360 }
1361 /*
1362 * If iscsi_target_do_login returns zero to signal more PDU
1363 * exchanges are required to complete the login, go ahead and
1364 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection
1365 * is still active.
1366 *
1367 * Otherwise if TCP connection dropped asynchronously, go ahead
1368 * and perform connection cleanup now.
1369 */
1370 ret = iscsi_target_do_login(conn, login);
1371 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
1372 ret = -1;
1373
1374 if (ret < 0) {
1375 iscsi_target_restore_sock_callbacks(conn);
1376 iscsi_remove_failed_auth_entry(conn);
1377 }
1378 if (ret != 0) {
1379 cancel_delayed_work_sync(&conn->login_work);
1380 iscsi_target_nego_release(conn);
1381 }
1382
1383 return ret;
1384 }
1385
iscsi_target_nego_release(struct iscsit_conn * conn)1386 void iscsi_target_nego_release(struct iscsit_conn *conn)
1387 {
1388 struct iscsi_login *login = conn->conn_login;
1389
1390 if (!login)
1391 return;
1392
1393 kfree(login->req_buf);
1394 kfree(login->rsp_buf);
1395 kfree(login);
1396
1397 conn->conn_login = NULL;
1398 }
1399