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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
[linux-2.6-block.git] / drivers / target / iscsi / iscsi_target_nego.c
CommitLineData
c942fddf 1// SPDX-License-Identifier: GPL-2.0-or-later
e48354ce
NB		 2/*******************************************************************************
3 * This file contains main functions related to iSCSI Parameter negotiation.
4 *
4c76251e 5 * (c) Copyright 2007-2013 Datera, Inc.
e48354ce
NB		 6 *
7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 *
e48354ce
NB		 9 ******************************************************************************/
10
11#include <linux/ctype.h>
e5419865 12#include <linux/kthread.h>
8dcf07be 13#include <linux/slab.h>
3f07c014 14#include <linux/sched/signal.h>
8dcf07be 15#include <net/sock.h>
e48354ce
NB		 16#include <scsi/iscsi_proto.h>
17#include <target/target_core_base.h>
c4795fb2 18#include <target/target_core_fabric.h>
baa4d64b 19#include <target/iscsi/iscsi_transport.h>
e48354ce 20
67f091f2 21#include <target/iscsi/iscsi_target_core.h>
e48354ce
NB		 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
33void 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
fceb5bc7 42static int strlen_semi(char *buf)
e48354ce
NB		 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
55int 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
369653e4 87 if (len >= max_length) {
5e58b029 88 pr_err("Length of input: %d exceeds max_length:"
e48354ce
NB		 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
98static 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;
c3e51442 109 struct iscsi_portal_group *iscsi_tpg;
e48354ce
NB		 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
c3e51442
NB		 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
b7eec2cd 139 auth = &iscsi_nacl->node_auth;
c3e51442 140 }
e48354ce
NB		 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#ifdef CANSRP
156 else if (strstr("SRP", authtype))
157 return srp_main_loop(conn, auth, in_buf, out_buf,
158 &in_length, out_length);
159#endif
160 else if (strstr("CHAP", authtype))
161 return chap_main_loop(conn, auth, in_buf, out_buf,
162 &in_length, out_length);
163 else if (strstr("SPKM1", authtype))
164 return 2;
165 else if (strstr("SPKM2", authtype))
166 return 2;
167 else if (strstr("KRB5", authtype))
168 return 2;
169 else
170 return 2;
171}
172
173static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
174{
175 kfree(conn->auth_protocol);
176}
177
baa4d64b 178int iscsi_target_check_login_request(
e48354ce
NB		 179 struct iscsi_conn *conn,
180 struct iscsi_login *login)
181{
28168905 182 int req_csg, req_nsg;
e48354ce
NB		 183 u32 payload_length;
184 struct iscsi_login_req *login_req;
e48354ce
NB		 185
186 login_req = (struct iscsi_login_req *) login->req;
e48354ce
NB		 187 payload_length = ntoh24(login_req->dlength);
188
189 switch (login_req->opcode & ISCSI_OPCODE_MASK) {
190 case ISCSI_OP_LOGIN:
191 break;
192 default:
193 pr_err("Received unknown opcode 0x%02x.\n",
194 login_req->opcode & ISCSI_OPCODE_MASK);
195 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
196 ISCSI_LOGIN_STATUS_INIT_ERR);
197 return -1;
198 }
199
200 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
201 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
202 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
203 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
204 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
205 ISCSI_LOGIN_STATUS_INIT_ERR);
206 return -1;
207 }
208
5d358065
AG		 209 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
210 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
e48354ce
NB		 211
212 if (req_csg != login->current_stage) {
213 pr_err("Initiator unexpectedly changed login stage"
214 " from %d to %d, login failed.\n", login->current_stage,
215 req_csg);
216 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
217 ISCSI_LOGIN_STATUS_INIT_ERR);
218 return -1;
219 }
220
221 if ((req_nsg == 2) || (req_csg >= 2) ||
222 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
223 (req_nsg <= req_csg))) {
224 pr_err("Illegal login_req->flags Combination, CSG: %d,"
225 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
226 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
227 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
228 ISCSI_LOGIN_STATUS_INIT_ERR);
229 return -1;
230 }
231
232 if ((login_req->max_version != login->version_max) ||
233 (login_req->min_version != login->version_min)) {
234 pr_err("Login request changed Version Max/Nin"
235 " unexpectedly to 0x%02x/0x%02x, protocol error\n",
236 login_req->max_version, login_req->min_version);
237 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
238 ISCSI_LOGIN_STATUS_INIT_ERR);
239 return -1;
240 }
241
242 if (memcmp(login_req->isid, login->isid, 6) != 0) {
243 pr_err("Login request changed ISID unexpectedly,"
244 " protocol error.\n");
245 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
246 ISCSI_LOGIN_STATUS_INIT_ERR);
247 return -1;
248 }
249
250 if (login_req->itt != login->init_task_tag) {
251 pr_err("Login request changed ITT unexpectedly to"
252 " 0x%08x, protocol error.\n", login_req->itt);
253 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
254 ISCSI_LOGIN_STATUS_INIT_ERR);
255 return -1;
256 }
257
258 if (payload_length > MAX_KEY_VALUE_PAIRS) {
259 pr_err("Login request payload exceeds default"
260 " MaxRecvDataSegmentLength: %u, protocol error.\n",
261 MAX_KEY_VALUE_PAIRS);
262 return -1;
263 }
264
265 return 0;
266}
d2faaefb 267EXPORT_SYMBOL(iscsi_target_check_login_request);
e48354ce
NB		 268
269static int iscsi_target_check_first_request(
270 struct iscsi_conn *conn,
271 struct iscsi_login *login)
272{
273 struct iscsi_param *param = NULL;
274 struct se_node_acl *se_nacl;
275
276 login->first_request = 0;
277
278 list_for_each_entry(param, &conn->param_list->param_list, p_list) {
279 if (!strncmp(param->name, SESSIONTYPE, 11)) {
280 if (!IS_PSTATE_ACCEPTOR(param)) {
281 pr_err("SessionType key not received"
282 " in first login request.\n");
283 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
284 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
285 return -1;
286 }
287 if (!strncmp(param->value, DISCOVERY, 9))
288 return 0;
289 }
290
291 if (!strncmp(param->name, INITIATORNAME, 13)) {
292 if (!IS_PSTATE_ACCEPTOR(param)) {
293 if (!login->leading_connection)
294 continue;
295
296 pr_err("InitiatorName key not received"
297 " in first login request.\n");
298 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
299 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
300 return -1;
301 }
302
303 /*
304 * For non-leading connections, double check that the
305 * received InitiatorName matches the existing session's
306 * struct iscsi_node_acl.
307 */
308 if (!login->leading_connection) {
309 se_nacl = conn->sess->se_sess->se_node_acl;
310 if (!se_nacl) {
311 pr_err("Unable to locate"
312 " struct se_node_acl\n");
313 iscsit_tx_login_rsp(conn,
314 ISCSI_STATUS_CLS_INITIATOR_ERR,
315 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
316 return -1;
317 }
318
319 if (strcmp(param->value,
320 se_nacl->initiatorname)) {
321 pr_err("Incorrect"
322 " InitiatorName: %s for this"
323 " iSCSI Initiator Node.\n",
324 param->value);
325 iscsit_tx_login_rsp(conn,
326 ISCSI_STATUS_CLS_INITIATOR_ERR,
327 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
328 return -1;
329 }
330 }
331 }
332 }
333
334 return 0;
335}
336
337static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
338{
339 u32 padding = 0;
e48354ce
NB		 340 struct iscsi_login_rsp *login_rsp;
341
342 login_rsp = (struct iscsi_login_rsp *) login->rsp;
343
344 login_rsp->opcode = ISCSI_OP_LOGIN_RSP;
345 hton24(login_rsp->dlength, login->rsp_length);
346 memcpy(login_rsp->isid, login->isid, 6);
347 login_rsp->tsih = cpu_to_be16(login->tsih);
66c7db68 348 login_rsp->itt = login->init_task_tag;
e48354ce
NB		 349 login_rsp->statsn = cpu_to_be32(conn->stat_sn++);
350 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 351 login_rsp->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
e48354ce
NB		 352
353 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
354 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
66c7db68 355 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
e48354ce
NB		 356 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
357 ntohl(login_rsp->statsn), login->rsp_length);
358
359 padding = ((-login->rsp_length) & 3);
e5419865
NB		 360 /*
361 * Before sending the last login response containing the transition
362 * bit for full-feature-phase, go ahead and start up TX/RX threads
363 * now to avoid potential resource allocation failures after the
364 * final login response has been sent.
365 */
366 if (login->login_complete) {
367 int rc = iscsit_start_kthreads(conn);
368 if (rc) {
369 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
370 ISCSI_LOGIN_STATUS_NO_RESOURCES);
371 return -1;
372 }
373 }
e48354ce 374
baa4d64b
NB		 375 if (conn->conn_transport->iscsit_put_login_tx(conn, login,
376 login->rsp_length + padding) < 0)
e5419865 377 goto err;
e48354ce
NB		 378
379 login->rsp_length = 0;
e48354ce
NB		 380
381 return 0;
e5419865
NB		 382
383err:
384 if (login->login_complete) {
385 if (conn->rx_thread && conn->rx_thread_active) {
386 send_sig(SIGINT, conn->rx_thread, 1);
ca82c2bd 387 complete(&conn->rx_login_comp);
e5419865
NB		 388 kthread_stop(conn->rx_thread);
389 }
390 if (conn->tx_thread && conn->tx_thread_active) {
391 send_sig(SIGINT, conn->tx_thread, 1);
392 kthread_stop(conn->tx_thread);
393 }
394 spin_lock(&iscsit_global->ts_bitmap_lock);
395 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
396 get_order(1));
397 spin_unlock(&iscsit_global->ts_bitmap_lock);
398 }
399 return -1;
e48354ce
NB		 400}
401
676d2369 402static void iscsi_target_sk_data_ready(struct sock *sk)
d381a801
NB		 403{
404 struct iscsi_conn *conn = sk->sk_user_data;
405 bool rc;
406
407 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
408
409 write_lock_bh(&sk->sk_callback_lock);
410 if (!sk->sk_user_data) {
411 write_unlock_bh(&sk->sk_callback_lock);
412 return;
413 }
414 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
415 write_unlock_bh(&sk->sk_callback_lock);
416 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
417 return;
418 }
419 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
420 write_unlock_bh(&sk->sk_callback_lock);
421 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
422 return;
423 }
424 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
425 write_unlock_bh(&sk->sk_callback_lock);
426 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
1c130ae0
FW		 427 if (iscsi_target_sk_data_ready == conn->orig_data_ready)
428 return;
429 conn->orig_data_ready(sk);
d381a801
NB		 430 return;
431 }
432
433 rc = schedule_delayed_work(&conn->login_work, 0);
0bcc297e 434 if (!rc) {
d381a801
NB		 435 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
436 " got false\n");
437 }
438 write_unlock_bh(&sk->sk_callback_lock);
439}
440
bb048357
NB		 441static void iscsi_target_sk_state_change(struct sock *);
442
d381a801
NB		 443static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
444{
445 struct sock *sk;
446
447 if (!conn->sock)
448 return;
449
450 sk = conn->sock->sk;
451 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
452
453 write_lock_bh(&sk->sk_callback_lock);
454 sk->sk_user_data = conn;
455 conn->orig_data_ready = sk->sk_data_ready;
bb048357 456 conn->orig_state_change = sk->sk_state_change;
d381a801 457 sk->sk_data_ready = iscsi_target_sk_data_ready;
bb048357 458 sk->sk_state_change = iscsi_target_sk_state_change;
d381a801 459 write_unlock_bh(&sk->sk_callback_lock);
bb048357
NB		 460
461 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
462 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
d381a801
NB		 463}
464
465static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
466{
467 struct sock *sk;
468
469 if (!conn->sock)
470 return;
471
472 sk = conn->sock->sk;
473 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
474
475 write_lock_bh(&sk->sk_callback_lock);
476 if (!sk->sk_user_data) {
477 write_unlock_bh(&sk->sk_callback_lock);
478 return;
479 }
480 sk->sk_user_data = NULL;
481 sk->sk_data_ready = conn->orig_data_ready;
bb048357 482 sk->sk_state_change = conn->orig_state_change;
d381a801 483 write_unlock_bh(&sk->sk_callback_lock);
bb048357
NB		 484
485 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
486 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
d381a801
NB		 487}
488
489static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
490
25cdda95 491static bool __iscsi_target_sk_check_close(struct sock *sk)
d381a801
NB		 492{
493 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
25cdda95 494 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE,"
d381a801 495 "returning FALSE\n");
25cdda95 496 return true;
d381a801 497 }
25cdda95
NB		 498 return false;
499}
500
501static bool iscsi_target_sk_check_close(struct iscsi_conn *conn)
502{
503 bool state = false;
504
505 if (conn->sock) {
506 struct sock *sk = conn->sock->sk;
507
508 read_lock_bh(&sk->sk_callback_lock);
509 state = (__iscsi_target_sk_check_close(sk) ||
510 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
511 read_unlock_bh(&sk->sk_callback_lock);
512 }
513 return state;
514}
515
516static bool iscsi_target_sk_check_flag(struct iscsi_conn *conn, unsigned int flag)
517{
518 bool state = false;
519
520 if (conn->sock) {
521 struct sock *sk = conn->sock->sk;
522
523 read_lock_bh(&sk->sk_callback_lock);
524 state = test_bit(flag, &conn->login_flags);
525 read_unlock_bh(&sk->sk_callback_lock);
526 }
527 return state;
528}
529
530static bool iscsi_target_sk_check_and_clear(struct iscsi_conn *conn, unsigned int flag)
531{
532 bool state = false;
533
534 if (conn->sock) {
535 struct sock *sk = conn->sock->sk;
536
537 write_lock_bh(&sk->sk_callback_lock);
538 state = (__iscsi_target_sk_check_close(sk) ||
539 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
540 if (!state)
541 clear_bit(flag, &conn->login_flags);
542 write_unlock_bh(&sk->sk_callback_lock);
543 }
544 return state;
d381a801
NB		 545}
546
547static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
548{
549 struct iscsi_np *np = login->np;
550 bool zero_tsih = login->zero_tsih;
551
552 iscsi_remove_failed_auth_entry(conn);
553 iscsi_target_nego_release(conn);
554 iscsi_target_login_sess_out(conn, np, zero_tsih, true);
555}
556
f7c9564a
KC		 557struct conn_timeout {
558 struct timer_list timer;
559 struct iscsi_conn *conn;
560};
561
562static void iscsi_target_login_timeout(struct timer_list *t)
d381a801 563{
f7c9564a
KC		 564 struct conn_timeout *timeout = from_timer(timeout, t, timer);
565 struct iscsi_conn *conn = timeout->conn;
d381a801
NB		 566
567 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
568
569 if (conn->login_kworker) {
570 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
571 conn->login_kworker->comm, conn->login_kworker->pid);
572 send_sig(SIGINT, conn->login_kworker, 1);
573 }
574}
575
576static void iscsi_target_do_login_rx(struct work_struct *work)
577{
578 struct iscsi_conn *conn = container_of(work,
579 struct iscsi_conn, login_work.work);
580 struct iscsi_login *login = conn->login;
581 struct iscsi_np *np = login->np;
582 struct iscsi_portal_group *tpg = conn->tpg;
583 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
f7c9564a 584 struct conn_timeout timeout;
d381a801
NB		 585 int rc, zero_tsih = login->zero_tsih;
586 bool state;
587
588 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
589 conn, current->comm, current->pid);
25cdda95
NB		 590 /*
591 * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready()
592 * before initial PDU processing in iscsi_target_start_negotiation()
593 * has completed, go ahead and retry until it's cleared.
594 *
595 * Otherwise if the TCP connection drops while this is occuring,
596 * iscsi_target_start_negotiation() will detect the failure, call
597 * cancel_delayed_work_sync(&conn->login_work), and cleanup the
598 * remaining iscsi connection resources from iscsi_np process context.
599 */
600 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) {
601 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10));
602 return;
603 }
d381a801
NB		 604
605 spin_lock(&tpg->tpg_state_lock);
606 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
607 spin_unlock(&tpg->tpg_state_lock);
608
0bcc297e 609 if (!state) {
d381a801 610 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
25cdda95 611 goto err;
d381a801
NB		 612 }
613
25cdda95
NB		 614 if (iscsi_target_sk_check_close(conn)) {
615 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
616 goto err;
d381a801
NB		 617 }
618
619 conn->login_kworker = current;
620 allow_signal(SIGINT);
621
f7c9564a
KC		 622 timeout.conn = conn;
623 timer_setup_on_stack(&timeout.timer, iscsi_target_login_timeout, 0);
624 mod_timer(&timeout.timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
625 pr_debug("Starting login timer for %s/%d\n", current->comm, current->pid);
d381a801
NB		 626
627 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
f7c9564a
KC		 628 del_timer_sync(&timeout.timer);
629 destroy_timer_on_stack(&timeout.timer);
d381a801
NB		 630 flush_signals(current);
631 conn->login_kworker = NULL;
632
25cdda95
NB		 633 if (rc < 0)
634 goto err;
d381a801
NB		 635
636 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
637 conn, current->comm, current->pid);
638
639 rc = iscsi_target_do_login(conn, login);
640 if (rc < 0) {
25cdda95 641 goto err;
d381a801 642 } else if (!rc) {
25cdda95
NB		 643 if (iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_READ_ACTIVE))
644 goto err;
d381a801
NB		 645 } else if (rc == 1) {
646 iscsi_target_nego_release(conn);
647 iscsi_post_login_handler(np, conn, zero_tsih);
648 iscsit_deaccess_np(np, tpg, tpg_np);
649 }
25cdda95
NB		 650 return;
651
652err:
653 iscsi_target_restore_sock_callbacks(conn);
654 iscsi_target_login_drop(conn, login);
655 iscsit_deaccess_np(np, tpg, tpg_np);
d381a801
NB		 656}
657
bb048357
NB		 658static void iscsi_target_sk_state_change(struct sock *sk)
659{
660 struct iscsi_conn *conn;
661 void (*orig_state_change)(struct sock *);
662 bool state;
663
664 pr_debug("Entering iscsi_target_sk_state_change\n");
665
666 write_lock_bh(&sk->sk_callback_lock);
667 conn = sk->sk_user_data;
668 if (!conn) {
669 write_unlock_bh(&sk->sk_callback_lock);
670 return;
671 }
672 orig_state_change = conn->orig_state_change;
673
674 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
675 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
676 conn);
677 write_unlock_bh(&sk->sk_callback_lock);
678 orig_state_change(sk);
679 return;
680 }
25cdda95
NB		 681 state = __iscsi_target_sk_check_close(sk);
682 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state);
683
bb048357
NB		 684 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
685 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
686 " conn: %p\n", conn);
25cdda95
NB		 687 if (state)
688 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
bb048357
NB		 689 write_unlock_bh(&sk->sk_callback_lock);
690 orig_state_change(sk);
691 return;
692 }
25cdda95 693 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
bb048357
NB		 694 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
695 conn);
696 write_unlock_bh(&sk->sk_callback_lock);
697 orig_state_change(sk);
698 return;
699 }
25cdda95
NB		 700 /*
701 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED,
702 * but only queue conn->login_work -> iscsi_target_do_login_rx()
703 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared.
704 *
705 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close()
706 * will detect the dropped TCP connection from delayed workqueue context.
707 *
708 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial
709 * iscsi_target_start_negotiation() is running, iscsi_target_do_login()
710 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation()
711 * via iscsi_target_sk_check_and_clear() is responsible for detecting the
712 * dropped TCP connection in iscsi_np process context, and cleaning up
713 * the remaining iscsi connection resources.
714 */
715 if (state) {
716 pr_debug("iscsi_target_sk_state_change got failed state\n");
717 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
718 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
719 write_unlock_bh(&sk->sk_callback_lock);
bb048357 720
25cdda95 721 orig_state_change(sk);
bb048357 722
25cdda95
NB		 723 if (!state)
724 schedule_delayed_work(&conn->login_work, 0);
bb048357
NB		 725 return;
726 }
25cdda95
NB		 727 write_unlock_bh(&sk->sk_callback_lock);
728
bb048357
NB		 729 orig_state_change(sk);
730}
731
e48354ce
NB		 732/*
733 * NOTE: We check for existing sessions or connections AFTER the initiator
734 * has been successfully authenticated in order to protect against faked
735 * ISID/TSIH combinations.
736 */
737static int iscsi_target_check_for_existing_instances(
738 struct iscsi_conn *conn,
739 struct iscsi_login *login)
740{
741 if (login->checked_for_existing)
742 return 0;
743
744 login->checked_for_existing = 1;
745
746 if (!login->tsih)
747 return iscsi_check_for_session_reinstatement(conn);
748 else
749 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
750 login->initial_exp_statsn);
751}
752
753static int iscsi_target_do_authentication(
754 struct iscsi_conn *conn,
755 struct iscsi_login *login)
756{
757 int authret;
758 u32 payload_length;
759 struct iscsi_param *param;
760 struct iscsi_login_req *login_req;
761 struct iscsi_login_rsp *login_rsp;
762
763 login_req = (struct iscsi_login_req *) login->req;
764 login_rsp = (struct iscsi_login_rsp *) login->rsp;
765 payload_length = ntoh24(login_req->dlength);
766
767 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
768 if (!param)
769 return -1;
770
771 authret = iscsi_handle_authentication(
772 conn,
773 login->req_buf,
774 login->rsp_buf,
775 payload_length,
776 &login->rsp_length,
777 param->value);
778 switch (authret) {
779 case 0:
780 pr_debug("Received OK response"
781 " from LIO Authentication, continuing.\n");
782 break;
783 case 1:
784 pr_debug("iSCSI security negotiation"
bfb9035c 785 " completed successfully.\n");
e48354ce
NB		 786 login->auth_complete = 1;
787 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
788 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
789 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
790 ISCSI_FLAG_LOGIN_TRANSIT);
791 login->current_stage = 1;
792 }
793 return iscsi_target_check_for_existing_instances(
794 conn, login);
795 case 2:
796 pr_err("Security negotiation"
797 " failed.\n");
798 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
799 ISCSI_LOGIN_STATUS_AUTH_FAILED);
800 return -1;
801 default:
802 pr_err("Received unknown error %d from LIO"
803 " Authentication\n", authret);
804 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
805 ISCSI_LOGIN_STATUS_TARGET_ERROR);
806 return -1;
807 }
808
809 return 0;
810}
811
812static int iscsi_target_handle_csg_zero(
813 struct iscsi_conn *conn,
814 struct iscsi_login *login)
815{
816 int ret;
817 u32 payload_length;
818 struct iscsi_param *param;
819 struct iscsi_login_req *login_req;
820 struct iscsi_login_rsp *login_rsp;
821
822 login_req = (struct iscsi_login_req *) login->req;
823 login_rsp = (struct iscsi_login_rsp *) login->rsp;
824 payload_length = ntoh24(login_req->dlength);
825
826 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
827 if (!param)
828 return -1;
829
830 ret = iscsi_decode_text_input(
831 PHASE_SECURITY|PHASE_DECLARATIVE,
832 SENDER_INITIATOR|SENDER_RECEIVER,
833 login->req_buf,
834 payload_length,
9977bb18 835 conn);
e48354ce
NB		 836 if (ret < 0)
837 return -1;
838
839 if (ret > 0) {
840 if (login->auth_complete) {
841 pr_err("Initiator has already been"
842 " successfully authenticated, but is still"
843 " sending %s keys.\n", param->value);
844 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
845 ISCSI_LOGIN_STATUS_INIT_ERR);
846 return -1;
847 }
848
849 goto do_auth;
91f0abfd
NB		 850 } else if (!payload_length) {
851 pr_err("Initiator sent zero length security payload,"
852 " login failed\n");
853 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
854 ISCSI_LOGIN_STATUS_AUTH_FAILED);
855 return -1;
e48354ce
NB		 856 }
857
858 if (login->first_request)
859 if (iscsi_target_check_first_request(conn, login) < 0)
860 return -1;
861
862 ret = iscsi_encode_text_output(
863 PHASE_SECURITY|PHASE_DECLARATIVE,
864 SENDER_TARGET,
865 login->rsp_buf,
866 &login->rsp_length,
138d351e
NB		 867 conn->param_list,
868 conn->tpg->tpg_attrib.login_keys_workaround);
e48354ce
NB		 869 if (ret < 0)
870 return -1;
871
872 if (!iscsi_check_negotiated_keys(conn->param_list)) {
60bfcf8e 873 if (conn->tpg->tpg_attrib.authentication &&
e48354ce
NB		 874 !strncmp(param->value, NONE, 4)) {
875 pr_err("Initiator sent AuthMethod=None but"
876 " Target is enforcing iSCSI Authentication,"
877 " login failed.\n");
878 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
879 ISCSI_LOGIN_STATUS_AUTH_FAILED);
880 return -1;
881 }
882
60bfcf8e 883 if (conn->tpg->tpg_attrib.authentication &&
e48354ce
NB		 884 !login->auth_complete)
885 return 0;
886
887 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
888 return 0;
889
890 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
891 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
892 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
893 ISCSI_FLAG_LOGIN_TRANSIT;
894 login->current_stage = 1;
895 }
896 }
897
898 return 0;
899do_auth:
900 return iscsi_target_do_authentication(conn, login);
901}
902
903static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
904{
905 int ret;
906 u32 payload_length;
907 struct iscsi_login_req *login_req;
908 struct iscsi_login_rsp *login_rsp;
909
910 login_req = (struct iscsi_login_req *) login->req;
911 login_rsp = (struct iscsi_login_rsp *) login->rsp;
912 payload_length = ntoh24(login_req->dlength);
913
914 ret = iscsi_decode_text_input(
915 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
916 SENDER_INITIATOR|SENDER_RECEIVER,
917 login->req_buf,
918 payload_length,
9977bb18 919 conn);
1c5c12c6
RD		 920 if (ret < 0) {
921 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
922 ISCSI_LOGIN_STATUS_INIT_ERR);
e48354ce 923 return -1;
1c5c12c6 924 }
e48354ce
NB		 925
926 if (login->first_request)
927 if (iscsi_target_check_first_request(conn, login) < 0)
928 return -1;
929
930 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
931 return -1;
932
933 ret = iscsi_encode_text_output(
934 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
935 SENDER_TARGET,
936 login->rsp_buf,
937 &login->rsp_length,
138d351e
NB		 938 conn->param_list,
939 conn->tpg->tpg_attrib.login_keys_workaround);
1c5c12c6
RD		 940 if (ret < 0) {
941 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
942 ISCSI_LOGIN_STATUS_INIT_ERR);
e48354ce 943 return -1;
1c5c12c6 944 }
e48354ce
NB		 945
946 if (!login->auth_complete &&
60bfcf8e 947 conn->tpg->tpg_attrib.authentication) {
e48354ce
NB		 948 pr_err("Initiator is requesting CSG: 1, has not been"
949 " successfully authenticated, and the Target is"
950 " enforcing iSCSI Authentication, login failed.\n");
951 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
952 ISCSI_LOGIN_STATUS_AUTH_FAILED);
953 return -1;
954 }
955
956 if (!iscsi_check_negotiated_keys(conn->param_list))
957 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
958 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
959 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
960 ISCSI_FLAG_LOGIN_TRANSIT;
961
962 return 0;
963}
964
965static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
966{
967 int pdu_count = 0;
968 struct iscsi_login_req *login_req;
969 struct iscsi_login_rsp *login_rsp;
970
971 login_req = (struct iscsi_login_req *) login->req;
972 login_rsp = (struct iscsi_login_rsp *) login->rsp;
973
974 while (1) {
975 if (++pdu_count > MAX_LOGIN_PDUS) {
976 pr_err("MAX_LOGIN_PDUS count reached.\n");
977 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
978 ISCSI_LOGIN_STATUS_TARGET_ERROR);
979 return -1;
980 }
981
5d358065 982 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
e48354ce 983 case 0:
5d358065 984 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
e48354ce
NB		 985 if (iscsi_target_handle_csg_zero(conn, login) < 0)
986 return -1;
987 break;
988 case 1:
989 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
990 if (iscsi_target_handle_csg_one(conn, login) < 0)
991 return -1;
992 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
25cdda95
NB		 993 /*
994 * Check to make sure the TCP connection has not
995 * dropped asynchronously while session reinstatement
996 * was occuring in this kthread context, before
997 * transitioning to full feature phase operation.
998 */
999 if (iscsi_target_sk_check_close(conn))
1000 return -1;
1001
e48354ce 1002 login->tsih = conn->sess->tsih;
baa4d64b 1003 login->login_complete = 1;
d381a801 1004 iscsi_target_restore_sock_callbacks(conn);
e48354ce
NB		 1005 if (iscsi_target_do_tx_login_io(conn,
1006 login) < 0)
1007 return -1;
d381a801 1008 return 1;
e48354ce
NB		 1009 }
1010 break;
1011 default:
1012 pr_err("Illegal CSG: %d received from"
1013 " Initiator, protocol error.\n",
5d358065 1014 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
e48354ce
NB		 1015 break;
1016 }
1017
ea3a179a 1018 if (iscsi_target_do_tx_login_io(conn, login) < 0)
e48354ce
NB		 1019 return -1;
1020
1021 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1022 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
1023 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
1024 }
d381a801 1025 break;
e48354ce
NB		 1026 }
1027
1028 return 0;
1029}
1030
1031static void iscsi_initiatorname_tolower(
1032 char *param_buf)
1033{
1034 char *c;
1035 u32 iqn_size = strlen(param_buf), i;
1036
1037 for (i = 0; i < iqn_size; i++) {
8359cf43 1038 c = &param_buf[i];
e48354ce
NB		 1039 if (!isupper(*c))
1040 continue;
1041
1042 *c = tolower(*c);
1043 }
1044}
1045
1046/*
1047 * Processes the first Login Request..
1048 */
baa4d64b 1049int iscsi_target_locate_portal(
e48354ce
NB		 1050 struct iscsi_np *np,
1051 struct iscsi_conn *conn,
1052 struct iscsi_login *login)
1053{
1054 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1055 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1056 struct iscsi_session *sess = conn->sess;
1057 struct iscsi_tiqn *tiqn;
d381a801 1058 struct iscsi_tpg_np *tpg_np = NULL;
e48354ce 1059 struct iscsi_login_req *login_req;
988e3a85
NB		 1060 struct se_node_acl *se_nacl;
1061 u32 payload_length, queue_depth = 0;
1062 int sessiontype = 0, ret = 0, tag_num, tag_size;
e48354ce 1063
d381a801
NB		 1064 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1065 iscsi_target_set_sock_callbacks(conn);
1066
1067 login->np = np;
1068
e48354ce 1069 login_req = (struct iscsi_login_req *) login->req;
e48354ce
NB		 1070 payload_length = ntoh24(login_req->dlength);
1071
e48354ce
NB		 1072 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1073 if (!tmpbuf) {
1074 pr_err("Unable to allocate memory for tmpbuf.\n");
1075 return -1;
1076 }
1077
1078 memcpy(tmpbuf, login->req_buf, payload_length);
1079 tmpbuf[payload_length] = '\0';
1080 start = tmpbuf;
1081 end = (start + payload_length);
1082
1083 /*
1084 * Locate the initial keys expected from the Initiator node in
1085 * the first login request in order to progress with the login phase.
1086 */
1087 while (start < end) {
1088 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1089 ret = -1;
1090 goto out;
1091 }
1092
1093 if (!strncmp(key, "InitiatorName", 13))
1094 i_buf = value;
1095 else if (!strncmp(key, "SessionType", 11))
1096 s_buf = value;
1097 else if (!strncmp(key, "TargetName", 10))
1098 t_buf = value;
1099
1100 start += strlen(key) + strlen(value) + 2;
1101 }
e48354ce
NB		 1102 /*
1103 * See 5.3. Login Phase.
1104 */
1105 if (!i_buf) {
1106 pr_err("InitiatorName key not received"
1107 " in first login request.\n");
1108 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1109 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1110 ret = -1;
1111 goto out;
1112 }
1113 /*
1114 * Convert the incoming InitiatorName to lowercase following
1115 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1116 * are NOT case sensitive.
1117 */
1118 iscsi_initiatorname_tolower(i_buf);
1119
1120 if (!s_buf) {
1121 if (!login->leading_connection)
1122 goto get_target;
1123
1124 pr_err("SessionType key not received"
1125 " in first login request.\n");
1126 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1127 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1128 ret = -1;
1129 goto out;
1130 }
1131
1132 /*
1133 * Use default portal group for discovery sessions.
1134 */
1135 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1136 if (!sessiontype) {
1137 conn->tpg = iscsit_global->discovery_tpg;
1138 if (!login->leading_connection)
1139 goto get_target;
1140
1141 sess->sess_ops->SessionType = 1;
1142 /*
1143 * Setup crc32c modules from libcrypto
1144 */
1145 if (iscsi_login_setup_crypto(conn) < 0) {
1146 pr_err("iscsi_login_setup_crypto() failed\n");
1147 ret = -1;
1148 goto out;
1149 }
1150 /*
1151 * Serialize access across the discovery struct iscsi_portal_group to
1152 * process login attempt.
1153 */
1154 if (iscsit_access_np(np, conn->tpg) < 0) {
1155 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1156 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1157 ret = -1;
1158 goto out;
1159 }
1160 ret = 0;
988e3a85 1161 goto alloc_tags;
e48354ce
NB		 1162 }
1163
1164get_target:
1165 if (!t_buf) {
1166 pr_err("TargetName key not received"
1167 " in first login request while"
1168 " SessionType=Normal.\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 /*
1176 * Locate Target IQN from Storage Node.
1177 */
1178 tiqn = iscsit_get_tiqn_for_login(t_buf);
1179 if (!tiqn) {
1180 pr_err("Unable to locate Target IQN: %s in"
1181 " Storage Node\n", t_buf);
1182 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1183 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1184 ret = -1;
1185 goto out;
1186 }
1187 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1188
1189 /*
1190 * Locate Target Portal Group from Storage Node.
1191 */
d381a801 1192 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
e48354ce
NB		 1193 if (!conn->tpg) {
1194 pr_err("Unable to locate Target Portal Group"
1195 " on %s\n", tiqn->tiqn);
1196 iscsit_put_tiqn_for_login(tiqn);
1197 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1198 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1199 ret = -1;
1200 goto out;
1201 }
d381a801 1202 conn->tpg_np = tpg_np;
e48354ce
NB		 1203 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1204 /*
1205 * Setup crc32c modules from libcrypto
1206 */
1207 if (iscsi_login_setup_crypto(conn) < 0) {
1208 pr_err("iscsi_login_setup_crypto() failed\n");
d381a801
NB		 1209 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1210 iscsit_put_tiqn_for_login(tiqn);
1211 conn->tpg = NULL;
e48354ce
NB		 1212 ret = -1;
1213 goto out;
1214 }
1215 /*
1216 * Serialize access across the struct iscsi_portal_group to
1217 * process login attempt.
1218 */
1219 if (iscsit_access_np(np, conn->tpg) < 0) {
d381a801 1220 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
e48354ce
NB		 1221 iscsit_put_tiqn_for_login(tiqn);
1222 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1223 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
e48354ce 1224 conn->tpg = NULL;
d381a801 1225 ret = -1;
e48354ce
NB		 1226 goto out;
1227 }
1228
1229 /*
1230 * conn->sess->node_acl will be set when the referenced
1231 * struct iscsi_session is located from received ISID+TSIH in
1232 * iscsi_login_non_zero_tsih_s2().
1233 */
1234 if (!login->leading_connection) {
1235 ret = 0;
1236 goto out;
1237 }
1238
1239 /*
1240 * This value is required in iscsi_login_zero_tsih_s2()
1241 */
1242 sess->sess_ops->SessionType = 0;
1243
1244 /*
1245 * Locate incoming Initiator IQN reference from Storage Node.
1246 */
1247 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1248 &conn->tpg->tpg_se_tpg, i_buf);
1249 if (!sess->se_sess->se_node_acl) {
1250 pr_err("iSCSI Initiator Node: %s is not authorized to"
1251 " access iSCSI target portal group: %hu.\n",
1252 i_buf, conn->tpg->tpgt);
1253 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1254 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1255 ret = -1;
1256 goto out;
1257 }
988e3a85
NB		 1258 se_nacl = sess->se_sess->se_node_acl;
1259 queue_depth = se_nacl->queue_depth;
1260 /*
1261 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1262 * depth for non immediate commands, plus extra tags for immediate
1263 * commands.
1264 *
1265 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1266 * in per-cpu-ida tag allocation logic + small queue_depth.
1267 */
1268alloc_tags:
1269 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
4a4caa29 1270 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
988e3a85 1271 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
e48354ce 1272
988e3a85
NB		 1273 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1274 if (ret < 0) {
1275 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1276 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1277 ret = -1;
1278 }
e48354ce
NB		 1279out:
1280 kfree(tmpbuf);
1281 return ret;
1282}
1283
e48354ce
NB		 1284int iscsi_target_start_negotiation(
1285 struct iscsi_login *login,
1286 struct iscsi_conn *conn)
1287{
baa4d64b 1288 int ret;
e48354ce 1289
1efaa949
BVA		 1290 if (conn->sock) {
1291 struct sock *sk = conn->sock->sk;
d381a801 1292
1efaa949
BVA		 1293 write_lock_bh(&sk->sk_callback_lock);
1294 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
25cdda95 1295 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
1efaa949
BVA		 1296 write_unlock_bh(&sk->sk_callback_lock);
1297 }
25cdda95
NB		 1298 /*
1299 * If iscsi_target_do_login returns zero to signal more PDU
1300 * exchanges are required to complete the login, go ahead and
1301 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection
1302 * is still active.
1303 *
1304 * Otherwise if TCP connection dropped asynchronously, go ahead
1305 * and perform connection cleanup now.
1306 */
1efaa949 1307 ret = iscsi_target_do_login(conn, login);
25cdda95
NB		 1308 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
1309 ret = -1;
1310
1efaa949 1311 if (ret < 0) {
d381a801
NB		 1312 cancel_delayed_work_sync(&conn->login_work);
1313 iscsi_target_restore_sock_callbacks(conn);
e48354ce 1314 iscsi_remove_failed_auth_entry(conn);
d381a801
NB		 1315 }
1316 if (ret != 0)
1317 iscsi_target_nego_release(conn);
e48354ce 1318
e48354ce
NB		 1319 return ret;
1320}
1321
baa4d64b 1322void iscsi_target_nego_release(struct iscsi_conn *conn)
e48354ce 1323{
baa4d64b
NB		 1324 struct iscsi_login *login = conn->conn_login;
1325
1326 if (!login)
1327 return;
1328
e48354ce
NB		 1329 kfree(login->req_buf);
1330 kfree(login->rsp_buf);
1331 kfree(login);
baa4d64b
NB		 1332
1333 conn->conn_login = NULL;
e48354ce 1334}
Linux 6.x block layer and io_uring tree(s)