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
convert_null_to_semi(char * buf,int len)32 void convert_null_to_semi(char *buf, int len)
33 {
34 int i;
35
36 for (i = 0; i < len; i++)
37 if (buf[i] == '\0')
38 buf[i] = ';';
39 }
40
strlen_semi(char * buf)41 static int strlen_semi(char *buf)
42 {
43 int i = 0;
44
45 while (buf[i] != '\0') {
46 if (buf[i] == ';')
47 return i;
48 i++;
49 }
50
51 return -1;
52 }
53
extract_param(const char * in_buf,const char * pattern,unsigned int max_length,char * out_buf,unsigned char * type)54 int extract_param(
55 const char *in_buf,
56 const char *pattern,
57 unsigned int max_length,
58 char *out_buf,
59 unsigned char *type)
60 {
61 char *ptr;
62 int len;
63
64 if (!in_buf || !pattern || !out_buf || !type)
65 return -EINVAL;
66
67 ptr = strstr(in_buf, pattern);
68 if (!ptr)
69 return -ENOENT;
70
71 ptr = strstr(ptr, "=");
72 if (!ptr)
73 return -EINVAL;
74
75 ptr += 1;
76 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
77 ptr += 2; /* skip 0x */
78 *type = HEX;
79 } else if (*ptr == '0' && (*(ptr+1) == 'b' || *(ptr+1) == 'B')) {
80 ptr += 2; /* skip 0b */
81 *type = BASE64;
82 } else
83 *type = DECIMAL;
84
85 len = strlen_semi(ptr);
86 if (len < 0)
87 return -EINVAL;
88
89 if (len >= max_length) {
90 pr_err("Length of input: %d exceeds max_length:"
91 " %d\n", len, max_length);
92 return -EINVAL;
93 }
94 memcpy(out_buf, ptr, len);
95 out_buf[len] = '\0';
96
97 return 0;
98 }
99
iscsi_get_node_auth(struct iscsit_conn * conn)100 static struct iscsi_node_auth *iscsi_get_node_auth(struct iscsit_conn *conn)
101 {
102 struct iscsi_portal_group *tpg;
103 struct iscsi_node_acl *nacl;
104 struct se_node_acl *se_nacl;
105
106 if (conn->sess->sess_ops->SessionType)
107 return &iscsit_global->discovery_acl.node_auth;
108
109 se_nacl = conn->sess->se_sess->se_node_acl;
110 if (!se_nacl) {
111 pr_err("Unable to locate struct se_node_acl for CHAP auth\n");
112 return NULL;
113 }
114
115 if (se_nacl->dynamic_node_acl) {
116 tpg = to_iscsi_tpg(se_nacl->se_tpg);
117 return &tpg->tpg_demo_auth;
118 }
119
120 nacl = to_iscsi_nacl(se_nacl);
121
122 return &nacl->node_auth;
123 }
124
iscsi_handle_authentication(struct iscsit_conn * conn,char * in_buf,char * out_buf,int in_length,int * out_length,unsigned char * authtype)125 static u32 iscsi_handle_authentication(
126 struct iscsit_conn *conn,
127 char *in_buf,
128 char *out_buf,
129 int in_length,
130 int *out_length,
131 unsigned char *authtype)
132 {
133 struct iscsi_node_auth *auth;
134
135 auth = iscsi_get_node_auth(conn);
136 if (!auth)
137 return -1;
138
139 if (strstr("CHAP", authtype))
140 strcpy(conn->sess->auth_type, "CHAP");
141 else
142 strcpy(conn->sess->auth_type, NONE);
143
144 if (strstr("None", authtype))
145 return 1;
146 else if (strstr("CHAP", authtype))
147 return chap_main_loop(conn, auth, in_buf, out_buf,
148 &in_length, out_length);
149 /* SRP, SPKM1, SPKM2 and KRB5 are unsupported */
150 return 2;
151 }
152
iscsi_remove_failed_auth_entry(struct iscsit_conn * conn)153 static void iscsi_remove_failed_auth_entry(struct iscsit_conn *conn)
154 {
155 kfree(conn->auth_protocol);
156 }
157
iscsi_target_check_login_request(struct iscsit_conn * conn,struct iscsi_login * login)158 int iscsi_target_check_login_request(
159 struct iscsit_conn *conn,
160 struct iscsi_login *login)
161 {
162 int req_csg, req_nsg;
163 u32 payload_length;
164 struct iscsi_login_req *login_req;
165
166 login_req = (struct iscsi_login_req *) login->req;
167 payload_length = ntoh24(login_req->dlength);
168
169 switch (login_req->opcode & ISCSI_OPCODE_MASK) {
170 case ISCSI_OP_LOGIN:
171 break;
172 default:
173 pr_err("Received unknown opcode 0x%02x.\n",
174 login_req->opcode & ISCSI_OPCODE_MASK);
175 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
176 ISCSI_LOGIN_STATUS_INIT_ERR);
177 return -1;
178 }
179
180 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
181 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
182 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
183 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
184 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
185 ISCSI_LOGIN_STATUS_INIT_ERR);
186 return -1;
187 }
188
189 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
190 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
191
192 if (req_csg != login->current_stage) {
193 pr_err("Initiator unexpectedly changed login stage"
194 " from %d to %d, login failed.\n", login->current_stage,
195 req_csg);
196 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
197 ISCSI_LOGIN_STATUS_INIT_ERR);
198 return -1;
199 }
200
201 if ((req_nsg == 2) || (req_csg >= 2) ||
202 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
203 (req_nsg <= req_csg))) {
204 pr_err("Illegal login_req->flags Combination, CSG: %d,"
205 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
206 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
207 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
208 ISCSI_LOGIN_STATUS_INIT_ERR);
209 return -1;
210 }
211
212 if ((login_req->max_version != login->version_max) ||
213 (login_req->min_version != login->version_min)) {
214 pr_err("Login request changed Version Max/Nin"
215 " unexpectedly to 0x%02x/0x%02x, protocol error\n",
216 login_req->max_version, login_req->min_version);
217 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
218 ISCSI_LOGIN_STATUS_INIT_ERR);
219 return -1;
220 }
221
222 if (memcmp(login_req->isid, login->isid, 6) != 0) {
223 pr_err("Login request changed ISID unexpectedly,"
224 " protocol error.\n");
225 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
226 ISCSI_LOGIN_STATUS_INIT_ERR);
227 return -1;
228 }
229
230 if (login_req->itt != login->init_task_tag) {
231 pr_err("Login request changed ITT unexpectedly to"
232 " 0x%08x, protocol error.\n", login_req->itt);
233 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
234 ISCSI_LOGIN_STATUS_INIT_ERR);
235 return -1;
236 }
237
238 if (payload_length > MAX_KEY_VALUE_PAIRS) {
239 pr_err("Login request payload exceeds default"
240 " MaxRecvDataSegmentLength: %u, protocol error.\n",
241 MAX_KEY_VALUE_PAIRS);
242 return -1;
243 }
244
245 return 0;
246 }
247 EXPORT_SYMBOL(iscsi_target_check_login_request);
248
iscsi_target_check_first_request(struct iscsit_conn * conn,struct iscsi_login * login)249 static int iscsi_target_check_first_request(
250 struct iscsit_conn *conn,
251 struct iscsi_login *login)
252 {
253 struct iscsi_param *param = NULL;
254 struct se_node_acl *se_nacl;
255
256 login->first_request = 0;
257
258 list_for_each_entry(param, &conn->param_list->param_list, p_list) {
259 if (!strncmp(param->name, SESSIONTYPE, 11)) {
260 if (!IS_PSTATE_ACCEPTOR(param)) {
261 pr_err("SessionType key not received"
262 " in first login request.\n");
263 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
264 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
265 return -1;
266 }
267 if (!strncmp(param->value, DISCOVERY, 9))
268 return 0;
269 }
270
271 if (!strncmp(param->name, INITIATORNAME, 13)) {
272 if (!IS_PSTATE_ACCEPTOR(param)) {
273 if (!login->leading_connection)
274 continue;
275
276 pr_err("InitiatorName key not received"
277 " in first login request.\n");
278 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
279 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
280 return -1;
281 }
282
283 /*
284 * For non-leading connections, double check that the
285 * received InitiatorName matches the existing session's
286 * struct iscsi_node_acl.
287 */
288 if (!login->leading_connection) {
289 se_nacl = conn->sess->se_sess->se_node_acl;
290 if (!se_nacl) {
291 pr_err("Unable to locate"
292 " struct se_node_acl\n");
293 iscsit_tx_login_rsp(conn,
294 ISCSI_STATUS_CLS_INITIATOR_ERR,
295 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
296 return -1;
297 }
298
299 if (strcmp(param->value,
300 se_nacl->initiatorname)) {
301 pr_err("Incorrect"
302 " InitiatorName: %s for this"
303 " iSCSI Initiator Node.\n",
304 param->value);
305 iscsit_tx_login_rsp(conn,
306 ISCSI_STATUS_CLS_INITIATOR_ERR,
307 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
308 return -1;
309 }
310 }
311 }
312 }
313
314 return 0;
315 }
316
iscsi_target_do_tx_login_io(struct iscsit_conn * conn,struct iscsi_login * login)317 static int iscsi_target_do_tx_login_io(struct iscsit_conn *conn, struct iscsi_login *login)
318 {
319 u32 padding = 0;
320 struct iscsi_login_rsp *login_rsp;
321
322 login_rsp = (struct iscsi_login_rsp *) login->rsp;
323
324 login_rsp->opcode = ISCSI_OP_LOGIN_RSP;
325 hton24(login_rsp->dlength, login->rsp_length);
326 memcpy(login_rsp->isid, login->isid, 6);
327 login_rsp->tsih = cpu_to_be16(login->tsih);
328 login_rsp->itt = login->init_task_tag;
329 login_rsp->statsn = cpu_to_be32(conn->stat_sn++);
330 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
331 login_rsp->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
332
333 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
334 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
335 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
336 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
337 ntohl(login_rsp->statsn), login->rsp_length);
338
339 padding = ((-login->rsp_length) & 3);
340 /*
341 * Before sending the last login response containing the transition
342 * bit for full-feature-phase, go ahead and start up TX/RX threads
343 * now to avoid potential resource allocation failures after the
344 * final login response has been sent.
345 */
346 if (login->login_complete) {
347 int rc = iscsit_start_kthreads(conn);
348 if (rc) {
349 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
350 ISCSI_LOGIN_STATUS_NO_RESOURCES);
351 return -1;
352 }
353 }
354
355 if (conn->conn_transport->iscsit_put_login_tx(conn, login,
356 login->rsp_length + padding) < 0)
357 goto err;
358
359 login->rsp_length = 0;
360
361 return 0;
362
363 err:
364 if (login->login_complete) {
365 if (conn->rx_thread && conn->rx_thread_active) {
366 send_sig(SIGINT, conn->rx_thread, 1);
367 complete(&conn->rx_login_comp);
368 kthread_stop(conn->rx_thread);
369 }
370 if (conn->tx_thread && conn->tx_thread_active) {
371 send_sig(SIGINT, conn->tx_thread, 1);
372 kthread_stop(conn->tx_thread);
373 }
374 spin_lock(&iscsit_global->ts_bitmap_lock);
375 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
376 get_order(1));
377 spin_unlock(&iscsit_global->ts_bitmap_lock);
378 }
379 return -1;
380 }
381
iscsi_target_sk_data_ready(struct sock * sk)382 static void iscsi_target_sk_data_ready(struct sock *sk)
383 {
384 struct iscsit_conn *conn = sk->sk_user_data;
385 bool rc;
386
387 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
388
389 write_lock_bh(&sk->sk_callback_lock);
390 if (!sk->sk_user_data) {
391 write_unlock_bh(&sk->sk_callback_lock);
392 return;
393 }
394 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
395 write_unlock_bh(&sk->sk_callback_lock);
396 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
397 return;
398 }
399 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
400 write_unlock_bh(&sk->sk_callback_lock);
401 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
402 return;
403 }
404 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
405 write_unlock_bh(&sk->sk_callback_lock);
406 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
407 if (iscsi_target_sk_data_ready == conn->orig_data_ready)
408 return;
409 conn->orig_data_ready(sk);
410 return;
411 }
412
413 rc = schedule_delayed_work(&conn->login_work, 0);
414 if (!rc) {
415 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
416 " got false\n");
417 }
418 write_unlock_bh(&sk->sk_callback_lock);
419 }
420
421 static void iscsi_target_sk_state_change(struct sock *);
422
iscsi_target_set_sock_callbacks(struct iscsit_conn * conn)423 static void iscsi_target_set_sock_callbacks(struct iscsit_conn *conn)
424 {
425 struct sock *sk;
426
427 if (!conn->sock)
428 return;
429
430 sk = conn->sock->sk;
431 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
432
433 write_lock_bh(&sk->sk_callback_lock);
434 sk->sk_user_data = conn;
435 conn->orig_data_ready = sk->sk_data_ready;
436 conn->orig_state_change = sk->sk_state_change;
437 sk->sk_data_ready = iscsi_target_sk_data_ready;
438 sk->sk_state_change = iscsi_target_sk_state_change;
439 write_unlock_bh(&sk->sk_callback_lock);
440
441 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
442 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
443 }
444
iscsi_target_restore_sock_callbacks(struct iscsit_conn * conn)445 static void iscsi_target_restore_sock_callbacks(struct iscsit_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_restore_sock_callbacks: conn: %p\n", conn);
454
455 write_lock_bh(&sk->sk_callback_lock);
456 if (!sk->sk_user_data) {
457 write_unlock_bh(&sk->sk_callback_lock);
458 return;
459 }
460 sk->sk_user_data = NULL;
461 sk->sk_data_ready = conn->orig_data_ready;
462 sk->sk_state_change = conn->orig_state_change;
463 write_unlock_bh(&sk->sk_callback_lock);
464
465 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
466 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
467 }
468
469 static int iscsi_target_do_login(struct iscsit_conn *, struct iscsi_login *);
470
__iscsi_target_sk_check_close(struct sock * sk)471 static bool __iscsi_target_sk_check_close(struct sock *sk)
472 {
473 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
474 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE,"
475 "returning TRUE\n");
476 return true;
477 }
478 return false;
479 }
480
iscsi_target_sk_check_close(struct iscsit_conn * conn)481 static bool iscsi_target_sk_check_close(struct iscsit_conn *conn)
482 {
483 bool state = false;
484
485 if (conn->sock) {
486 struct sock *sk = conn->sock->sk;
487
488 read_lock_bh(&sk->sk_callback_lock);
489 state = (__iscsi_target_sk_check_close(sk) ||
490 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
491 read_unlock_bh(&sk->sk_callback_lock);
492 }
493 return state;
494 }
495
iscsi_target_sk_check_flag(struct iscsit_conn * conn,unsigned int flag)496 static bool iscsi_target_sk_check_flag(struct iscsit_conn *conn, unsigned int flag)
497 {
498 bool state = false;
499
500 if (conn->sock) {
501 struct sock *sk = conn->sock->sk;
502
503 read_lock_bh(&sk->sk_callback_lock);
504 state = test_bit(flag, &conn->login_flags);
505 read_unlock_bh(&sk->sk_callback_lock);
506 }
507 return state;
508 }
509
iscsi_target_sk_check_and_clear(struct iscsit_conn * conn,unsigned int flag)510 static bool iscsi_target_sk_check_and_clear(struct iscsit_conn *conn, unsigned int flag)
511 {
512 bool state = false;
513
514 if (conn->sock) {
515 struct sock *sk = conn->sock->sk;
516
517 write_lock_bh(&sk->sk_callback_lock);
518 state = (__iscsi_target_sk_check_close(sk) ||
519 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
520 if (!state)
521 clear_bit(flag, &conn->login_flags);
522 write_unlock_bh(&sk->sk_callback_lock);
523 }
524 return state;
525 }
526
iscsi_target_login_drop(struct iscsit_conn * conn,struct iscsi_login * login)527 static void iscsi_target_login_drop(struct iscsit_conn *conn, struct iscsi_login *login)
528 {
529 bool zero_tsih = login->zero_tsih;
530
531 iscsi_remove_failed_auth_entry(conn);
532 iscsi_target_nego_release(conn);
533 iscsi_target_login_sess_out(conn, zero_tsih, true);
534 }
535
536 struct conn_timeout {
537 struct timer_list timer;
538 struct iscsit_conn *conn;
539 };
540
iscsi_target_login_timeout(struct timer_list * t)541 static void iscsi_target_login_timeout(struct timer_list *t)
542 {
543 struct conn_timeout *timeout = from_timer(timeout, t, timer);
544 struct iscsit_conn *conn = timeout->conn;
545
546 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
547
548 if (conn->login_kworker) {
549 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
550 conn->login_kworker->comm, conn->login_kworker->pid);
551 send_sig(SIGINT, conn->login_kworker, 1);
552 }
553 }
554
iscsi_target_do_login_rx(struct work_struct * work)555 static void iscsi_target_do_login_rx(struct work_struct *work)
556 {
557 struct iscsit_conn *conn = container_of(work,
558 struct iscsit_conn, login_work.work);
559 struct iscsi_login *login = conn->login;
560 struct iscsi_np *np = login->np;
561 struct iscsi_portal_group *tpg = conn->tpg;
562 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
563 struct conn_timeout timeout;
564 int rc, zero_tsih = login->zero_tsih;
565 bool state;
566
567 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
568 conn, current->comm, current->pid);
569 /*
570 * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready()
571 * before initial PDU processing in iscsi_target_start_negotiation()
572 * has completed, go ahead and retry until it's cleared.
573 *
574 * Otherwise if the TCP connection drops while this is occuring,
575 * iscsi_target_start_negotiation() will detect the failure, call
576 * cancel_delayed_work_sync(&conn->login_work), and cleanup the
577 * remaining iscsi connection resources from iscsi_np process context.
578 */
579 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) {
580 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10));
581 return;
582 }
583
584 spin_lock(&tpg->tpg_state_lock);
585 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
586 spin_unlock(&tpg->tpg_state_lock);
587
588 if (!state) {
589 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
590 goto err;
591 }
592
593 if (iscsi_target_sk_check_close(conn)) {
594 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
595 goto err;
596 }
597
598 conn->login_kworker = current;
599 allow_signal(SIGINT);
600
601 timeout.conn = conn;
602 timer_setup_on_stack(&timeout.timer, iscsi_target_login_timeout, 0);
603 mod_timer(&timeout.timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
604 pr_debug("Starting login timer for %s/%d\n", current->comm, current->pid);
605
606 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
607 del_timer_sync(&timeout.timer);
608 destroy_timer_on_stack(&timeout.timer);
609 flush_signals(current);
610 conn->login_kworker = NULL;
611
612 if (rc < 0)
613 goto err;
614
615 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
616 conn, current->comm, current->pid);
617
618 /*
619 * LOGIN_FLAGS_READ_ACTIVE is cleared so that sk_data_ready
620 * could be triggered again after this.
621 *
622 * LOGIN_FLAGS_WRITE_ACTIVE is cleared after we successfully
623 * process a login PDU, so that sk_state_chage can do login
624 * cleanup as needed if the socket is closed. If a delayed work is
625 * ongoing (LOGIN_FLAGS_WRITE_ACTIVE or LOGIN_FLAGS_READ_ACTIVE),
626 * sk_state_change will leave the cleanup to the delayed work or
627 * it will schedule a delayed work to do cleanup.
628 */
629 if (conn->sock) {
630 struct sock *sk = conn->sock->sk;
631
632 write_lock_bh(&sk->sk_callback_lock);
633 if (!test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags)) {
634 clear_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags);
635 set_bit(LOGIN_FLAGS_WRITE_ACTIVE, &conn->login_flags);
636 }
637 write_unlock_bh(&sk->sk_callback_lock);
638 }
639
640 rc = iscsi_target_do_login(conn, login);
641 if (rc < 0) {
642 goto err;
643 } else if (!rc) {
644 if (iscsi_target_sk_check_and_clear(conn,
645 LOGIN_FLAGS_WRITE_ACTIVE))
646 goto err;
647 } else if (rc == 1) {
648 cancel_delayed_work(&conn->login_work);
649 iscsi_target_nego_release(conn);
650 iscsi_post_login_handler(np, conn, zero_tsih);
651 iscsit_deaccess_np(np, tpg, tpg_np);
652 }
653 return;
654
655 err:
656 iscsi_target_restore_sock_callbacks(conn);
657 cancel_delayed_work(&conn->login_work);
658 iscsi_target_login_drop(conn, login);
659 iscsit_deaccess_np(np, tpg, tpg_np);
660 }
661
iscsi_target_sk_state_change(struct sock * sk)662 static void iscsi_target_sk_state_change(struct sock *sk)
663 {
664 struct iscsit_conn *conn;
665 void (*orig_state_change)(struct sock *);
666 bool state;
667
668 pr_debug("Entering iscsi_target_sk_state_change\n");
669
670 write_lock_bh(&sk->sk_callback_lock);
671 conn = sk->sk_user_data;
672 if (!conn) {
673 write_unlock_bh(&sk->sk_callback_lock);
674 return;
675 }
676 orig_state_change = conn->orig_state_change;
677
678 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
679 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
680 conn);
681 write_unlock_bh(&sk->sk_callback_lock);
682 orig_state_change(sk);
683 return;
684 }
685 state = __iscsi_target_sk_check_close(sk);
686 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state);
687
688 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags) ||
689 test_bit(LOGIN_FLAGS_WRITE_ACTIVE, &conn->login_flags)) {
690 pr_debug("Got LOGIN_FLAGS_{READ|WRITE}_ACTIVE=1"
691 " sk_state_change conn: %p\n", conn);
692 if (state)
693 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
694 write_unlock_bh(&sk->sk_callback_lock);
695 orig_state_change(sk);
696 return;
697 }
698 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
699 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
700 conn);
701 write_unlock_bh(&sk->sk_callback_lock);
702 orig_state_change(sk);
703 return;
704 }
705 /*
706 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED,
707 * but only queue conn->login_work -> iscsi_target_do_login_rx()
708 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared.
709 *
710 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close()
711 * will detect the dropped TCP connection from delayed workqueue context.
712 *
713 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial
714 * iscsi_target_start_negotiation() is running, iscsi_target_do_login()
715 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation()
716 * via iscsi_target_sk_check_and_clear() is responsible for detecting the
717 * dropped TCP connection in iscsi_np process context, and cleaning up
718 * the remaining iscsi connection resources.
719 */
720 if (state) {
721 pr_debug("iscsi_target_sk_state_change got failed state\n");
722 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
723 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
724 write_unlock_bh(&sk->sk_callback_lock);
725
726 orig_state_change(sk);
727
728 if (!state)
729 schedule_delayed_work(&conn->login_work, 0);
730 return;
731 }
732 write_unlock_bh(&sk->sk_callback_lock);
733
734 orig_state_change(sk);
735 }
736
737 /*
738 * NOTE: We check for existing sessions or connections AFTER the initiator
739 * has been successfully authenticated in order to protect against faked
740 * ISID/TSIH combinations.
741 */
iscsi_target_check_for_existing_instances(struct iscsit_conn * conn,struct iscsi_login * login)742 static int iscsi_target_check_for_existing_instances(
743 struct iscsit_conn *conn,
744 struct iscsi_login *login)
745 {
746 if (login->checked_for_existing)
747 return 0;
748
749 login->checked_for_existing = 1;
750
751 if (!login->tsih)
752 return iscsi_check_for_session_reinstatement(conn);
753 else
754 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
755 login->initial_exp_statsn);
756 }
757
iscsi_target_do_authentication(struct iscsit_conn * conn,struct iscsi_login * login)758 static int iscsi_target_do_authentication(
759 struct iscsit_conn *conn,
760 struct iscsi_login *login)
761 {
762 int authret;
763 u32 payload_length;
764 struct iscsi_param *param;
765 struct iscsi_login_req *login_req;
766 struct iscsi_login_rsp *login_rsp;
767
768 login_req = (struct iscsi_login_req *) login->req;
769 login_rsp = (struct iscsi_login_rsp *) login->rsp;
770 payload_length = ntoh24(login_req->dlength);
771
772 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
773 if (!param)
774 return -1;
775
776 authret = iscsi_handle_authentication(
777 conn,
778 login->req_buf,
779 login->rsp_buf,
780 payload_length,
781 &login->rsp_length,
782 param->value);
783 switch (authret) {
784 case 0:
785 pr_debug("Received OK response"
786 " from LIO Authentication, continuing.\n");
787 break;
788 case 1:
789 pr_debug("iSCSI security negotiation"
790 " completed successfully.\n");
791 login->auth_complete = 1;
792 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
793 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
794 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
795 ISCSI_FLAG_LOGIN_TRANSIT);
796 login->current_stage = 1;
797 }
798 return iscsi_target_check_for_existing_instances(
799 conn, login);
800 case 2:
801 pr_err("Security negotiation"
802 " failed.\n");
803 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
804 ISCSI_LOGIN_STATUS_AUTH_FAILED);
805 return -1;
806 default:
807 pr_err("Received unknown error %d from LIO"
808 " Authentication\n", authret);
809 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
810 ISCSI_LOGIN_STATUS_TARGET_ERROR);
811 return -1;
812 }
813
814 return 0;
815 }
816
iscsi_conn_auth_required(struct iscsit_conn * conn)817 bool iscsi_conn_auth_required(struct iscsit_conn *conn)
818 {
819 struct iscsi_node_acl *nacl;
820 struct se_node_acl *se_nacl;
821
822 if (conn->sess->sess_ops->SessionType) {
823 /*
824 * For SessionType=Discovery
825 */
826 return conn->tpg->tpg_attrib.authentication;
827 }
828 /*
829 * For SessionType=Normal
830 */
831 se_nacl = conn->sess->se_sess->se_node_acl;
832 if (!se_nacl) {
833 pr_debug("Unknown ACL is trying to connect\n");
834 return true;
835 }
836
837 if (se_nacl->dynamic_node_acl) {
838 pr_debug("Dynamic ACL %s is trying to connect\n",
839 se_nacl->initiatorname);
840 return conn->tpg->tpg_attrib.authentication;
841 }
842
843 pr_debug("Known ACL %s is trying to connect\n",
844 se_nacl->initiatorname);
845
846 nacl = to_iscsi_nacl(se_nacl);
847 if (nacl->node_attrib.authentication == NA_AUTHENTICATION_INHERITED)
848 return conn->tpg->tpg_attrib.authentication;
849
850 return nacl->node_attrib.authentication;
851 }
852
iscsi_target_handle_csg_zero(struct iscsit_conn * conn,struct iscsi_login * login)853 static int iscsi_target_handle_csg_zero(
854 struct iscsit_conn *conn,
855 struct iscsi_login *login)
856 {
857 int ret;
858 u32 payload_length;
859 struct iscsi_param *param;
860 struct iscsi_login_req *login_req;
861 struct iscsi_login_rsp *login_rsp;
862
863 login_req = (struct iscsi_login_req *) login->req;
864 login_rsp = (struct iscsi_login_rsp *) login->rsp;
865 payload_length = ntoh24(login_req->dlength);
866
867 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
868 if (!param)
869 return -1;
870
871 ret = iscsi_decode_text_input(
872 PHASE_SECURITY|PHASE_DECLARATIVE,
873 SENDER_INITIATOR|SENDER_RECEIVER,
874 login->req_buf,
875 payload_length,
876 conn);
877 if (ret < 0)
878 return -1;
879
880 if (ret > 0) {
881 if (login->auth_complete) {
882 pr_err("Initiator has already been"
883 " successfully authenticated, but is still"
884 " sending %s keys.\n", param->value);
885 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
886 ISCSI_LOGIN_STATUS_INIT_ERR);
887 return -1;
888 }
889
890 goto do_auth;
891 } else if (!payload_length) {
892 pr_err("Initiator sent zero length security payload,"
893 " login failed\n");
894 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
895 ISCSI_LOGIN_STATUS_AUTH_FAILED);
896 return -1;
897 }
898
899 if (login->first_request)
900 if (iscsi_target_check_first_request(conn, login) < 0)
901 return -1;
902
903 ret = iscsi_encode_text_output(
904 PHASE_SECURITY|PHASE_DECLARATIVE,
905 SENDER_TARGET,
906 login->rsp_buf,
907 &login->rsp_length,
908 conn->param_list,
909 conn->tpg->tpg_attrib.login_keys_workaround);
910 if (ret < 0)
911 return -1;
912
913 if (!iscsi_check_negotiated_keys(conn->param_list)) {
914 bool auth_required = iscsi_conn_auth_required(conn);
915
916 if (auth_required) {
917 if (!strncmp(param->value, NONE, 4)) {
918 pr_err("Initiator sent AuthMethod=None but"
919 " Target is enforcing iSCSI Authentication,"
920 " login failed.\n");
921 iscsit_tx_login_rsp(conn,
922 ISCSI_STATUS_CLS_INITIATOR_ERR,
923 ISCSI_LOGIN_STATUS_AUTH_FAILED);
924 return -1;
925 }
926
927 if (!login->auth_complete)
928 return 0;
929
930 if (strncmp(param->value, NONE, 4) &&
931 !login->auth_complete)
932 return 0;
933 }
934
935 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
936 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
937 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
938 ISCSI_FLAG_LOGIN_TRANSIT;
939 login->current_stage = 1;
940 }
941 }
942
943 return 0;
944 do_auth:
945 return iscsi_target_do_authentication(conn, login);
946 }
947
iscsi_conn_authenticated(struct iscsit_conn * conn,struct iscsi_login * login)948 static bool iscsi_conn_authenticated(struct iscsit_conn *conn,
949 struct iscsi_login *login)
950 {
951 if (!iscsi_conn_auth_required(conn))
952 return true;
953
954 if (login->auth_complete)
955 return true;
956
957 return false;
958 }
959
iscsi_target_handle_csg_one(struct iscsit_conn * conn,struct iscsi_login * login)960 static int iscsi_target_handle_csg_one(struct iscsit_conn *conn, struct iscsi_login *login)
961 {
962 int ret;
963 u32 payload_length;
964 struct iscsi_login_req *login_req;
965 struct iscsi_login_rsp *login_rsp;
966
967 login_req = (struct iscsi_login_req *) login->req;
968 login_rsp = (struct iscsi_login_rsp *) login->rsp;
969 payload_length = ntoh24(login_req->dlength);
970
971 ret = iscsi_decode_text_input(
972 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
973 SENDER_INITIATOR|SENDER_RECEIVER,
974 login->req_buf,
975 payload_length,
976 conn);
977 if (ret < 0) {
978 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
979 ISCSI_LOGIN_STATUS_INIT_ERR);
980 return -1;
981 }
982
983 if (login->first_request)
984 if (iscsi_target_check_first_request(conn, login) < 0)
985 return -1;
986
987 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
988 return -1;
989
990 ret = iscsi_encode_text_output(
991 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
992 SENDER_TARGET,
993 login->rsp_buf,
994 &login->rsp_length,
995 conn->param_list,
996 conn->tpg->tpg_attrib.login_keys_workaround);
997 if (ret < 0) {
998 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
999 ISCSI_LOGIN_STATUS_INIT_ERR);
1000 return -1;
1001 }
1002
1003 if (!iscsi_conn_authenticated(conn, login)) {
1004 pr_err("Initiator is requesting CSG: 1, has not been"
1005 " successfully authenticated, and the Target is"
1006 " enforcing iSCSI Authentication, login failed.\n");
1007 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1008 ISCSI_LOGIN_STATUS_AUTH_FAILED);
1009 return -1;
1010 }
1011
1012 if (!iscsi_check_negotiated_keys(conn->param_list))
1013 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
1014 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
1015 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
1016 ISCSI_FLAG_LOGIN_TRANSIT;
1017
1018 return 0;
1019 }
1020
1021 /*
1022 * RETURN VALUE:
1023 *
1024 * 1 = Login successful
1025 * -1 = Login failed
1026 * 0 = More PDU exchanges required
1027 */
iscsi_target_do_login(struct iscsit_conn * conn,struct iscsi_login * login)1028 static int iscsi_target_do_login(struct iscsit_conn *conn, struct iscsi_login *login)
1029 {
1030 int pdu_count = 0;
1031 struct iscsi_login_req *login_req;
1032 struct iscsi_login_rsp *login_rsp;
1033
1034 login_req = (struct iscsi_login_req *) login->req;
1035 login_rsp = (struct iscsi_login_rsp *) login->rsp;
1036
1037 while (1) {
1038 if (++pdu_count > MAX_LOGIN_PDUS) {
1039 pr_err("MAX_LOGIN_PDUS count reached.\n");
1040 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1041 ISCSI_LOGIN_STATUS_TARGET_ERROR);
1042 return -1;
1043 }
1044
1045 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
1046 case 0:
1047 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
1048 if (iscsi_target_handle_csg_zero(conn, login) < 0)
1049 return -1;
1050 break;
1051 case 1:
1052 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
1053 if (iscsi_target_handle_csg_one(conn, login) < 0)
1054 return -1;
1055 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1056 /*
1057 * Check to make sure the TCP connection has not
1058 * dropped asynchronously while session reinstatement
1059 * was occuring in this kthread context, before
1060 * transitioning to full feature phase operation.
1061 */
1062 if (iscsi_target_sk_check_close(conn))
1063 return -1;
1064
1065 login->tsih = conn->sess->tsih;
1066 login->login_complete = 1;
1067 iscsi_target_restore_sock_callbacks(conn);
1068 if (iscsi_target_do_tx_login_io(conn,
1069 login) < 0)
1070 return -1;
1071 return 1;
1072 }
1073 break;
1074 default:
1075 pr_err("Illegal CSG: %d received from"
1076 " Initiator, protocol error.\n",
1077 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
1078 break;
1079 }
1080
1081 if (iscsi_target_do_tx_login_io(conn, login) < 0)
1082 return -1;
1083
1084 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1085 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
1086 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
1087 }
1088 break;
1089 }
1090
1091 return 0;
1092 }
1093
iscsi_initiatorname_tolower(char * param_buf)1094 static void iscsi_initiatorname_tolower(
1095 char *param_buf)
1096 {
1097 char *c;
1098 u32 iqn_size = strlen(param_buf), i;
1099
1100 for (i = 0; i < iqn_size; i++) {
1101 c = ¶m_buf[i];
1102 if (!isupper(*c))
1103 continue;
1104
1105 *c = tolower(*c);
1106 }
1107 }
1108
1109 /*
1110 * Processes the first Login Request..
1111 */
iscsi_target_locate_portal(struct iscsi_np * np,struct iscsit_conn * conn,struct iscsi_login * login)1112 int iscsi_target_locate_portal(
1113 struct iscsi_np *np,
1114 struct iscsit_conn *conn,
1115 struct iscsi_login *login)
1116 {
1117 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1118 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1119 struct iscsit_session *sess = conn->sess;
1120 struct iscsi_tiqn *tiqn;
1121 struct iscsi_tpg_np *tpg_np = NULL;
1122 struct iscsi_login_req *login_req;
1123 struct se_node_acl *se_nacl;
1124 u32 payload_length, queue_depth = 0;
1125 int sessiontype = 0, ret = 0, tag_num, tag_size;
1126
1127 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1128 iscsi_target_set_sock_callbacks(conn);
1129
1130 login->np = np;
1131
1132 login_req = (struct iscsi_login_req *) login->req;
1133 payload_length = ntoh24(login_req->dlength);
1134
1135 tmpbuf = kmemdup_nul(login->req_buf, payload_length, GFP_KERNEL);
1136 if (!tmpbuf) {
1137 pr_err("Unable to allocate memory for tmpbuf.\n");
1138 return -1;
1139 }
1140
1141 start = tmpbuf;
1142 end = (start + payload_length);
1143
1144 /*
1145 * Locate the initial keys expected from the Initiator node in
1146 * the first login request in order to progress with the login phase.
1147 */
1148 while (start < end) {
1149 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1150 ret = -1;
1151 goto out;
1152 }
1153
1154 if (!strncmp(key, "InitiatorName", 13))
1155 i_buf = value;
1156 else if (!strncmp(key, "SessionType", 11))
1157 s_buf = value;
1158 else if (!strncmp(key, "TargetName", 10))
1159 t_buf = value;
1160
1161 start += strlen(key) + strlen(value) + 2;
1162 }
1163 /*
1164 * See 5.3. Login Phase.
1165 */
1166 if (!i_buf) {
1167 pr_err("InitiatorName key not received"
1168 " in first login request.\n");
1169 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1170 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1171 ret = -1;
1172 goto out;
1173 }
1174 /*
1175 * Convert the incoming InitiatorName to lowercase following
1176 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1177 * are NOT case sensitive.
1178 */
1179 iscsi_initiatorname_tolower(i_buf);
1180
1181 if (!s_buf) {
1182 if (!login->leading_connection)
1183 goto get_target;
1184
1185 pr_err("SessionType key not received"
1186 " in first login request.\n");
1187 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1188 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1189 ret = -1;
1190 goto out;
1191 }
1192
1193 /*
1194 * Use default portal group for discovery sessions.
1195 */
1196 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1197 if (!sessiontype) {
1198 conn->tpg = iscsit_global->discovery_tpg;
1199 if (!login->leading_connection)
1200 goto get_target;
1201
1202 sess->sess_ops->SessionType = 1;
1203 /*
1204 * Setup crc32c modules from libcrypto
1205 */
1206 if (iscsi_login_setup_crypto(conn) < 0) {
1207 pr_err("iscsi_login_setup_crypto() failed\n");
1208 ret = -1;
1209 goto out;
1210 }
1211 /*
1212 * Serialize access across the discovery struct iscsi_portal_group to
1213 * process login attempt.
1214 */
1215 if (iscsit_access_np(np, conn->tpg) < 0) {
1216 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1217 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1218 ret = -1;
1219 goto out;
1220 }
1221 ret = 0;
1222 goto alloc_tags;
1223 }
1224
1225 get_target:
1226 if (!t_buf) {
1227 pr_err("TargetName key not received"
1228 " in first login request while"
1229 " SessionType=Normal.\n");
1230 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1231 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1232 ret = -1;
1233 goto out;
1234 }
1235
1236 /*
1237 * Locate Target IQN from Storage Node.
1238 */
1239 tiqn = iscsit_get_tiqn_for_login(t_buf);
1240 if (!tiqn) {
1241 pr_err("Unable to locate Target IQN: %s in"
1242 " Storage Node\n", t_buf);
1243 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1244 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1245 ret = -1;
1246 goto out;
1247 }
1248 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1249
1250 /*
1251 * Locate Target Portal Group from Storage Node.
1252 */
1253 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1254 if (!conn->tpg) {
1255 pr_err("Unable to locate Target Portal Group"
1256 " on %s\n", tiqn->tiqn);
1257 iscsit_put_tiqn_for_login(tiqn);
1258 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1259 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1260 ret = -1;
1261 goto out;
1262 }
1263 conn->tpg_np = tpg_np;
1264 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1265 /*
1266 * Setup crc32c modules from libcrypto
1267 */
1268 if (iscsi_login_setup_crypto(conn) < 0) {
1269 pr_err("iscsi_login_setup_crypto() failed\n");
1270 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1271 iscsit_put_tiqn_for_login(tiqn);
1272 conn->tpg = NULL;
1273 ret = -1;
1274 goto out;
1275 }
1276 /*
1277 * Serialize access across the struct iscsi_portal_group to
1278 * process login attempt.
1279 */
1280 if (iscsit_access_np(np, conn->tpg) < 0) {
1281 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1282 iscsit_put_tiqn_for_login(tiqn);
1283 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1284 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1285 conn->tpg = NULL;
1286 ret = -1;
1287 goto out;
1288 }
1289
1290 /*
1291 * conn->sess->node_acl will be set when the referenced
1292 * struct iscsit_session is located from received ISID+TSIH in
1293 * iscsi_login_non_zero_tsih_s2().
1294 */
1295 if (!login->leading_connection) {
1296 ret = 0;
1297 goto out;
1298 }
1299
1300 /*
1301 * This value is required in iscsi_login_zero_tsih_s2()
1302 */
1303 sess->sess_ops->SessionType = 0;
1304
1305 /*
1306 * Locate incoming Initiator IQN reference from Storage Node.
1307 */
1308 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1309 &conn->tpg->tpg_se_tpg, i_buf);
1310 if (!sess->se_sess->se_node_acl) {
1311 pr_err("iSCSI Initiator Node: %s is not authorized to"
1312 " access iSCSI target portal group: %hu.\n",
1313 i_buf, conn->tpg->tpgt);
1314 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1315 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1316 ret = -1;
1317 goto out;
1318 }
1319 se_nacl = sess->se_sess->se_node_acl;
1320 queue_depth = se_nacl->queue_depth;
1321 /*
1322 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1323 * depth for non immediate commands, plus extra tags for immediate
1324 * commands.
1325 *
1326 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1327 * in per-cpu-ida tag allocation logic + small queue_depth.
1328 */
1329 alloc_tags:
1330 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1331 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1332 tag_size = sizeof(struct iscsit_cmd) + conn->conn_transport->priv_size;
1333
1334 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1335 if (ret < 0) {
1336 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1337 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1338 ret = -1;
1339 }
1340 out:
1341 kfree(tmpbuf);
1342 return ret;
1343 }
1344
iscsi_target_start_negotiation(struct iscsi_login * login,struct iscsit_conn * conn)1345 int iscsi_target_start_negotiation(
1346 struct iscsi_login *login,
1347 struct iscsit_conn *conn)
1348 {
1349 int ret;
1350
1351 if (conn->sock) {
1352 struct sock *sk = conn->sock->sk;
1353
1354 write_lock_bh(&sk->sk_callback_lock);
1355 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1356 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
1357 write_unlock_bh(&sk->sk_callback_lock);
1358 }
1359 /*
1360 * If iscsi_target_do_login returns zero to signal more PDU
1361 * exchanges are required to complete the login, go ahead and
1362 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection
1363 * is still active.
1364 *
1365 * Otherwise if TCP connection dropped asynchronously, go ahead
1366 * and perform connection cleanup now.
1367 */
1368 ret = iscsi_target_do_login(conn, login);
1369 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
1370 ret = -1;
1371
1372 if (ret < 0) {
1373 iscsi_target_restore_sock_callbacks(conn);
1374 iscsi_remove_failed_auth_entry(conn);
1375 }
1376 if (ret != 0) {
1377 cancel_delayed_work_sync(&conn->login_work);
1378 iscsi_target_nego_release(conn);
1379 }
1380
1381 return ret;
1382 }
1383
iscsi_target_nego_release(struct iscsit_conn * conn)1384 void iscsi_target_nego_release(struct iscsit_conn *conn)
1385 {
1386 struct iscsi_login *login = conn->conn_login;
1387
1388 if (!login)
1389 return;
1390
1391 kfree(login->req_buf);
1392 kfree(login->rsp_buf);
1393 kfree(login);
1394
1395 conn->conn_login = NULL;
1396 }
1397