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x86/topology: Fix function name in documentation
[cris-mirror.git] / drivers / target / iscsi / iscsi_target_nego.c
blob8a5e8d17a942620d8f17bb519bbb4fffd369e494
1 /*******************************************************************************
2 * This file contains main functions related to iSCSI Parameter negotiation.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19 #include <linux/ctype.h>
20 #include <linux/kthread.h>
21 #include <linux/slab.h>
22 #include <linux/sched/signal.h>
23 #include <net/sock.h>
24 #include <scsi/iscsi_proto.h>
25 #include <target/target_core_base.h>
26 #include <target/target_core_fabric.h>
27 #include <target/iscsi/iscsi_transport.h>
28
29 #include <target/iscsi/iscsi_target_core.h>
30 #include "iscsi_target_parameters.h"
31 #include "iscsi_target_login.h"
32 #include "iscsi_target_nego.h"
33 #include "iscsi_target_tpg.h"
34 #include "iscsi_target_util.h"
35 #include "iscsi_target.h"
36 #include "iscsi_target_auth.h"
37
38 #define MAX_LOGIN_PDUS 7
39 #define TEXT_LEN 4096
40
41 void convert_null_to_semi(char *buf, int len)
42 {
43 int i;
44
45 for (i = 0; i < len; i++)
46 if (buf[i] == '\0')
47 buf[i] = ';';
48 }
49
50 static int strlen_semi(char *buf)
51 {
52 int i = 0;
53
54 while (buf[i] != '\0') {
55 if (buf[i] == ';')
56 return i;
57 i++;
58 }
59
60 return -1;
61 }
62
63 int extract_param(
64 const char *in_buf,
65 const char *pattern,
66 unsigned int max_length,
67 char *out_buf,
68 unsigned char *type)
69 {
70 char *ptr;
71 int len;
72
73 if (!in_buf || !pattern || !out_buf || !type)
74 return -1;
75
76 ptr = strstr(in_buf, pattern);
77 if (!ptr)
78 return -1;
79
80 ptr = strstr(ptr, "=");
81 if (!ptr)
82 return -1;
83
84 ptr += 1;
85 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
86 ptr += 2; /* skip 0x */
87 *type = HEX;
88 } else
89 *type = DECIMAL;
90
91 len = strlen_semi(ptr);
92 if (len < 0)
93 return -1;
94
95 if (len >= max_length) {
96 pr_err("Length of input: %d exceeds max_length:"
97 " %d\n", len, max_length);
98 return -1;
99 }
100 memcpy(out_buf, ptr, len);
101 out_buf[len] = '\0';
102
103 return 0;
104 }
105
106 static u32 iscsi_handle_authentication(
107 struct iscsi_conn *conn,
108 char *in_buf,
109 char *out_buf,
110 int in_length,
111 int *out_length,
112 unsigned char *authtype)
113 {
114 struct iscsi_session *sess = conn->sess;
115 struct iscsi_node_auth *auth;
116 struct iscsi_node_acl *iscsi_nacl;
117 struct iscsi_portal_group *iscsi_tpg;
118 struct se_node_acl *se_nacl;
119
120 if (!sess->sess_ops->SessionType) {
121 /*
122 * For SessionType=Normal
123 */
124 se_nacl = conn->sess->se_sess->se_node_acl;
125 if (!se_nacl) {
126 pr_err("Unable to locate struct se_node_acl for"
127 " CHAP auth\n");
128 return -1;
129 }
130 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
131 se_node_acl);
132 if (!iscsi_nacl) {
133 pr_err("Unable to locate struct iscsi_node_acl for"
134 " CHAP auth\n");
135 return -1;
136 }
137
138 if (se_nacl->dynamic_node_acl) {
139 iscsi_tpg = container_of(se_nacl->se_tpg,
140 struct iscsi_portal_group, tpg_se_tpg);
141
142 auth = &iscsi_tpg->tpg_demo_auth;
143 } else {
144 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
145 se_node_acl);
146
147 auth = &iscsi_nacl->node_auth;
148 }
149 } else {
150 /*
151 * For SessionType=Discovery
152 */
153 auth = &iscsit_global->discovery_acl.node_auth;
154 }
155
156 if (strstr("CHAP", authtype))
157 strcpy(conn->sess->auth_type, "CHAP");
158 else
159 strcpy(conn->sess->auth_type, NONE);
160
161 if (strstr("None", authtype))
162 return 1;
163 #ifdef CANSRP
164 else if (strstr("SRP", authtype))
165 return srp_main_loop(conn, auth, in_buf, out_buf,
166 &in_length, out_length);
167 #endif
168 else if (strstr("CHAP", authtype))
169 return chap_main_loop(conn, auth, in_buf, out_buf,
170 &in_length, out_length);
171 else if (strstr("SPKM1", authtype))
172 return 2;
173 else if (strstr("SPKM2", authtype))
174 return 2;
175 else if (strstr("KRB5", authtype))
176 return 2;
177 else
178 return 2;
179 }
180
181 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
182 {
183 kfree(conn->auth_protocol);
184 }
185
186 int iscsi_target_check_login_request(
187 struct iscsi_conn *conn,
188 struct iscsi_login *login)
189 {
190 int req_csg, req_nsg;
191 u32 payload_length;
192 struct iscsi_login_req *login_req;
193
194 login_req = (struct iscsi_login_req *) login->req;
195 payload_length = ntoh24(login_req->dlength);
196
197 switch (login_req->opcode & ISCSI_OPCODE_MASK) {
198 case ISCSI_OP_LOGIN:
199 break;
200 default:
201 pr_err("Received unknown opcode 0x%02x.\n",
202 login_req->opcode & ISCSI_OPCODE_MASK);
203 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
204 ISCSI_LOGIN_STATUS_INIT_ERR);
205 return -1;
206 }
207
208 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
209 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
210 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
211 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
212 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
213 ISCSI_LOGIN_STATUS_INIT_ERR);
214 return -1;
215 }
216
217 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
218 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
219
220 if (req_csg != login->current_stage) {
221 pr_err("Initiator unexpectedly changed login stage"
222 " from %d to %d, login failed.\n", login->current_stage,
223 req_csg);
224 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
225 ISCSI_LOGIN_STATUS_INIT_ERR);
226 return -1;
227 }
228
229 if ((req_nsg == 2) || (req_csg >= 2) ||
230 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
231 (req_nsg <= req_csg))) {
232 pr_err("Illegal login_req->flags Combination, CSG: %d,"
233 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
234 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
235 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
236 ISCSI_LOGIN_STATUS_INIT_ERR);
237 return -1;
238 }
239
240 if ((login_req->max_version != login->version_max) ||
241 (login_req->min_version != login->version_min)) {
242 pr_err("Login request changed Version Max/Nin"
243 " unexpectedly to 0x%02x/0x%02x, protocol error\n",
244 login_req->max_version, login_req->min_version);
245 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
246 ISCSI_LOGIN_STATUS_INIT_ERR);
247 return -1;
248 }
249
250 if (memcmp(login_req->isid, login->isid, 6) != 0) {
251 pr_err("Login request changed ISID unexpectedly,"
252 " protocol error.\n");
253 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
254 ISCSI_LOGIN_STATUS_INIT_ERR);
255 return -1;
256 }
257
258 if (login_req->itt != login->init_task_tag) {
259 pr_err("Login request changed ITT unexpectedly to"
260 " 0x%08x, protocol error.\n", login_req->itt);
261 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
262 ISCSI_LOGIN_STATUS_INIT_ERR);
263 return -1;
264 }
265
266 if (payload_length > MAX_KEY_VALUE_PAIRS) {
267 pr_err("Login request payload exceeds default"
268 " MaxRecvDataSegmentLength: %u, protocol error.\n",
269 MAX_KEY_VALUE_PAIRS);
270 return -1;
271 }
272
273 return 0;
274 }
275 EXPORT_SYMBOL(iscsi_target_check_login_request);
276
277 static int iscsi_target_check_first_request(
278 struct iscsi_conn *conn,
279 struct iscsi_login *login)
280 {
281 struct iscsi_param *param = NULL;
282 struct se_node_acl *se_nacl;
283
284 login->first_request = 0;
285
286 list_for_each_entry(param, &conn->param_list->param_list, p_list) {
287 if (!strncmp(param->name, SESSIONTYPE, 11)) {
288 if (!IS_PSTATE_ACCEPTOR(param)) {
289 pr_err("SessionType key not received"
290 " in first login request.\n");
291 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
292 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
293 return -1;
294 }
295 if (!strncmp(param->value, DISCOVERY, 9))
296 return 0;
297 }
298
299 if (!strncmp(param->name, INITIATORNAME, 13)) {
300 if (!IS_PSTATE_ACCEPTOR(param)) {
301 if (!login->leading_connection)
302 continue;
303
304 pr_err("InitiatorName key not received"
305 " in first login request.\n");
306 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
307 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
308 return -1;
309 }
310
311 /*
312 * For non-leading connections, double check that the
313 * received InitiatorName matches the existing session's
314 * struct iscsi_node_acl.
315 */
316 if (!login->leading_connection) {
317 se_nacl = conn->sess->se_sess->se_node_acl;
318 if (!se_nacl) {
319 pr_err("Unable to locate"
320 " struct se_node_acl\n");
321 iscsit_tx_login_rsp(conn,
322 ISCSI_STATUS_CLS_INITIATOR_ERR,
323 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
324 return -1;
325 }
326
327 if (strcmp(param->value,
328 se_nacl->initiatorname)) {
329 pr_err("Incorrect"
330 " InitiatorName: %s for this"
331 " iSCSI Initiator Node.\n",
332 param->value);
333 iscsit_tx_login_rsp(conn,
334 ISCSI_STATUS_CLS_INITIATOR_ERR,
335 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
336 return -1;
337 }
338 }
339 }
340 }
341
342 return 0;
343 }
344
345 static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
346 {
347 u32 padding = 0;
348 struct iscsi_login_rsp *login_rsp;
349
350 login_rsp = (struct iscsi_login_rsp *) login->rsp;
351
352 login_rsp->opcode = ISCSI_OP_LOGIN_RSP;
353 hton24(login_rsp->dlength, login->rsp_length);
354 memcpy(login_rsp->isid, login->isid, 6);
355 login_rsp->tsih = cpu_to_be16(login->tsih);
356 login_rsp->itt = login->init_task_tag;
357 login_rsp->statsn = cpu_to_be32(conn->stat_sn++);
358 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
359 login_rsp->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
360
361 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
362 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
363 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
364 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
365 ntohl(login_rsp->statsn), login->rsp_length);
366
367 padding = ((-login->rsp_length) & 3);
368 /*
369 * Before sending the last login response containing the transition
370 * bit for full-feature-phase, go ahead and start up TX/RX threads
371 * now to avoid potential resource allocation failures after the
372 * final login response has been sent.
373 */
374 if (login->login_complete) {
375 int rc = iscsit_start_kthreads(conn);
376 if (rc) {
377 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
378 ISCSI_LOGIN_STATUS_NO_RESOURCES);
379 return -1;
380 }
381 }
382
383 if (conn->conn_transport->iscsit_put_login_tx(conn, login,
384 login->rsp_length + padding) < 0)
385 goto err;
386
387 login->rsp_length = 0;
388
389 return 0;
390
391 err:
392 if (login->login_complete) {
393 if (conn->rx_thread && conn->rx_thread_active) {
394 send_sig(SIGINT, conn->rx_thread, 1);
395 complete(&conn->rx_login_comp);
396 kthread_stop(conn->rx_thread);
397 }
398 if (conn->tx_thread && conn->tx_thread_active) {
399 send_sig(SIGINT, conn->tx_thread, 1);
400 kthread_stop(conn->tx_thread);
401 }
402 spin_lock(&iscsit_global->ts_bitmap_lock);
403 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
404 get_order(1));
405 spin_unlock(&iscsit_global->ts_bitmap_lock);
406 }
407 return -1;
408 }
409
410 static void iscsi_target_sk_data_ready(struct sock *sk)
411 {
412 struct iscsi_conn *conn = sk->sk_user_data;
413 bool rc;
414
415 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
416
417 write_lock_bh(&sk->sk_callback_lock);
418 if (!sk->sk_user_data) {
419 write_unlock_bh(&sk->sk_callback_lock);
420 return;
421 }
422 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
423 write_unlock_bh(&sk->sk_callback_lock);
424 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
425 return;
426 }
427 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
428 write_unlock_bh(&sk->sk_callback_lock);
429 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
430 return;
431 }
432 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
433 write_unlock_bh(&sk->sk_callback_lock);
434 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
435 if (iscsi_target_sk_data_ready == conn->orig_data_ready)
436 return;
437 conn->orig_data_ready(sk);
438 return;
439 }
440
441 rc = schedule_delayed_work(&conn->login_work, 0);
442 if (!rc) {
443 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
444 " got false\n");
445 }
446 write_unlock_bh(&sk->sk_callback_lock);
447 }
448
449 static void iscsi_target_sk_state_change(struct sock *);
450
451 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
452 {
453 struct sock *sk;
454
455 if (!conn->sock)
456 return;
457
458 sk = conn->sock->sk;
459 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
460
461 write_lock_bh(&sk->sk_callback_lock);
462 sk->sk_user_data = conn;
463 conn->orig_data_ready = sk->sk_data_ready;
464 conn->orig_state_change = sk->sk_state_change;
465 sk->sk_data_ready = iscsi_target_sk_data_ready;
466 sk->sk_state_change = iscsi_target_sk_state_change;
467 write_unlock_bh(&sk->sk_callback_lock);
468
469 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
470 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
471 }
472
473 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
474 {
475 struct sock *sk;
476
477 if (!conn->sock)
478 return;
479
480 sk = conn->sock->sk;
481 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
482
483 write_lock_bh(&sk->sk_callback_lock);
484 if (!sk->sk_user_data) {
485 write_unlock_bh(&sk->sk_callback_lock);
486 return;
487 }
488 sk->sk_user_data = NULL;
489 sk->sk_data_ready = conn->orig_data_ready;
490 sk->sk_state_change = conn->orig_state_change;
491 write_unlock_bh(&sk->sk_callback_lock);
492
493 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
494 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
495 }
496
497 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
498
499 static bool __iscsi_target_sk_check_close(struct sock *sk)
500 {
501 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
502 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE,"
503 "returning FALSE\n");
504 return true;
505 }
506 return false;
507 }
508
509 static bool iscsi_target_sk_check_close(struct iscsi_conn *conn)
510 {
511 bool state = false;
512
513 if (conn->sock) {
514 struct sock *sk = conn->sock->sk;
515
516 read_lock_bh(&sk->sk_callback_lock);
517 state = (__iscsi_target_sk_check_close(sk) ||
518 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
519 read_unlock_bh(&sk->sk_callback_lock);
520 }
521 return state;
522 }
523
524 static bool iscsi_target_sk_check_flag(struct iscsi_conn *conn, unsigned int flag)
525 {
526 bool state = false;
527
528 if (conn->sock) {
529 struct sock *sk = conn->sock->sk;
530
531 read_lock_bh(&sk->sk_callback_lock);
532 state = test_bit(flag, &conn->login_flags);
533 read_unlock_bh(&sk->sk_callback_lock);
534 }
535 return state;
536 }
537
538 static bool iscsi_target_sk_check_and_clear(struct iscsi_conn *conn, unsigned int flag)
539 {
540 bool state = false;
541
542 if (conn->sock) {
543 struct sock *sk = conn->sock->sk;
544
545 write_lock_bh(&sk->sk_callback_lock);
546 state = (__iscsi_target_sk_check_close(sk) ||
547 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
548 if (!state)
549 clear_bit(flag, &conn->login_flags);
550 write_unlock_bh(&sk->sk_callback_lock);
551 }
552 return state;
553 }
554
555 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
556 {
557 struct iscsi_np *np = login->np;
558 bool zero_tsih = login->zero_tsih;
559
560 iscsi_remove_failed_auth_entry(conn);
561 iscsi_target_nego_release(conn);
562 iscsi_target_login_sess_out(conn, np, zero_tsih, true);
563 }
564
565 struct conn_timeout {
566 struct timer_list timer;
567 struct iscsi_conn *conn;
568 };
569
570 static void iscsi_target_login_timeout(struct timer_list *t)
571 {
572 struct conn_timeout *timeout = from_timer(timeout, t, timer);
573 struct iscsi_conn *conn = timeout->conn;
574
575 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
576
577 if (conn->login_kworker) {
578 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
579 conn->login_kworker->comm, conn->login_kworker->pid);
580 send_sig(SIGINT, conn->login_kworker, 1);
581 }
582 }
583
584 static void iscsi_target_do_login_rx(struct work_struct *work)
585 {
586 struct iscsi_conn *conn = container_of(work,
587 struct iscsi_conn, login_work.work);
588 struct iscsi_login *login = conn->login;
589 struct iscsi_np *np = login->np;
590 struct iscsi_portal_group *tpg = conn->tpg;
591 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
592 struct conn_timeout timeout;
593 int rc, zero_tsih = login->zero_tsih;
594 bool state;
595
596 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
597 conn, current->comm, current->pid);
598 /*
599 * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready()
600 * before initial PDU processing in iscsi_target_start_negotiation()
601 * has completed, go ahead and retry until it's cleared.
602 *
603 * Otherwise if the TCP connection drops while this is occuring,
604 * iscsi_target_start_negotiation() will detect the failure, call
605 * cancel_delayed_work_sync(&conn->login_work), and cleanup the
606 * remaining iscsi connection resources from iscsi_np process context.
607 */
608 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) {
609 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10));
610 return;
611 }
612
613 spin_lock(&tpg->tpg_state_lock);
614 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
615 spin_unlock(&tpg->tpg_state_lock);
616
617 if (!state) {
618 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
619 goto err;
620 }
621
622 if (iscsi_target_sk_check_close(conn)) {
623 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
624 goto err;
625 }
626
627 conn->login_kworker = current;
628 allow_signal(SIGINT);
629
630 timeout.conn = conn;
631 timer_setup_on_stack(&timeout.timer, iscsi_target_login_timeout, 0);
632 mod_timer(&timeout.timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
633 pr_debug("Starting login timer for %s/%d\n", current->comm, current->pid);
634
635 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
636 del_timer_sync(&timeout.timer);
637 destroy_timer_on_stack(&timeout.timer);
638 flush_signals(current);
639 conn->login_kworker = NULL;
640
641 if (rc < 0)
642 goto err;
643
644 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
645 conn, current->comm, current->pid);
646
647 rc = iscsi_target_do_login(conn, login);
648 if (rc < 0) {
649 goto err;
650 } else if (!rc) {
651 if (iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_READ_ACTIVE))
652 goto err;
653 } else if (rc == 1) {
654 iscsi_target_nego_release(conn);
655 iscsi_post_login_handler(np, conn, zero_tsih);
656 iscsit_deaccess_np(np, tpg, tpg_np);
657 }
658 return;
659
660 err:
661 iscsi_target_restore_sock_callbacks(conn);
662 iscsi_target_login_drop(conn, login);
663 iscsit_deaccess_np(np, tpg, tpg_np);
664 }
665
666 static void iscsi_target_sk_state_change(struct sock *sk)
667 {
668 struct iscsi_conn *conn;
669 void (*orig_state_change)(struct sock *);
670 bool state;
671
672 pr_debug("Entering iscsi_target_sk_state_change\n");
673
674 write_lock_bh(&sk->sk_callback_lock);
675 conn = sk->sk_user_data;
676 if (!conn) {
677 write_unlock_bh(&sk->sk_callback_lock);
678 return;
679 }
680 orig_state_change = conn->orig_state_change;
681
682 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
683 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
684 conn);
685 write_unlock_bh(&sk->sk_callback_lock);
686 orig_state_change(sk);
687 return;
688 }
689 state = __iscsi_target_sk_check_close(sk);
690 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state);
691
692 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
693 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
694 " conn: %p\n", conn);
695 if (state)
696 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
697 write_unlock_bh(&sk->sk_callback_lock);
698 orig_state_change(sk);
699 return;
700 }
701 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
702 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
703 conn);
704 write_unlock_bh(&sk->sk_callback_lock);
705 orig_state_change(sk);
706 return;
707 }
708 /*
709 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED,
710 * but only queue conn->login_work -> iscsi_target_do_login_rx()
711 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared.
712 *
713 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close()
714 * will detect the dropped TCP connection from delayed workqueue context.
715 *
716 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial
717 * iscsi_target_start_negotiation() is running, iscsi_target_do_login()
718 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation()
719 * via iscsi_target_sk_check_and_clear() is responsible for detecting the
720 * dropped TCP connection in iscsi_np process context, and cleaning up
721 * the remaining iscsi connection resources.
722 */
723 if (state) {
724 pr_debug("iscsi_target_sk_state_change got failed state\n");
725 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
726 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
727 write_unlock_bh(&sk->sk_callback_lock);
728
729 orig_state_change(sk);
730
731 if (!state)
732 schedule_delayed_work(&conn->login_work, 0);
733 return;
734 }
735 write_unlock_bh(&sk->sk_callback_lock);
736
737 orig_state_change(sk);
738 }
739
740 /*
741 * NOTE: We check for existing sessions or connections AFTER the initiator
742 * has been successfully authenticated in order to protect against faked
743 * ISID/TSIH combinations.
744 */
745 static int iscsi_target_check_for_existing_instances(
746 struct iscsi_conn *conn,
747 struct iscsi_login *login)
748 {
749 if (login->checked_for_existing)
750 return 0;
751
752 login->checked_for_existing = 1;
753
754 if (!login->tsih)
755 return iscsi_check_for_session_reinstatement(conn);
756 else
757 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
758 login->initial_exp_statsn);
759 }
760
761 static int iscsi_target_do_authentication(
762 struct iscsi_conn *conn,
763 struct iscsi_login *login)
764 {
765 int authret;
766 u32 payload_length;
767 struct iscsi_param *param;
768 struct iscsi_login_req *login_req;
769 struct iscsi_login_rsp *login_rsp;
770
771 login_req = (struct iscsi_login_req *) login->req;
772 login_rsp = (struct iscsi_login_rsp *) login->rsp;
773 payload_length = ntoh24(login_req->dlength);
774
775 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
776 if (!param)
777 return -1;
778
779 authret = iscsi_handle_authentication(
780 conn,
781 login->req_buf,
782 login->rsp_buf,
783 payload_length,
784 &login->rsp_length,
785 param->value);
786 switch (authret) {
787 case 0:
788 pr_debug("Received OK response"
789 " from LIO Authentication, continuing.\n");
790 break;
791 case 1:
792 pr_debug("iSCSI security negotiation"
793 " completed successfully.\n");
794 login->auth_complete = 1;
795 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
796 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
797 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
798 ISCSI_FLAG_LOGIN_TRANSIT);
799 login->current_stage = 1;
800 }
801 return iscsi_target_check_for_existing_instances(
802 conn, login);
803 case 2:
804 pr_err("Security negotiation"
805 " failed.\n");
806 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
807 ISCSI_LOGIN_STATUS_AUTH_FAILED);
808 return -1;
809 default:
810 pr_err("Received unknown error %d from LIO"
811 " Authentication\n", authret);
812 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
813 ISCSI_LOGIN_STATUS_TARGET_ERROR);
814 return -1;
815 }
816
817 return 0;
818 }
819
820 static int iscsi_target_handle_csg_zero(
821 struct iscsi_conn *conn,
822 struct iscsi_login *login)
823 {
824 int ret;
825 u32 payload_length;
826 struct iscsi_param *param;
827 struct iscsi_login_req *login_req;
828 struct iscsi_login_rsp *login_rsp;
829
830 login_req = (struct iscsi_login_req *) login->req;
831 login_rsp = (struct iscsi_login_rsp *) login->rsp;
832 payload_length = ntoh24(login_req->dlength);
833
834 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
835 if (!param)
836 return -1;
837
838 ret = iscsi_decode_text_input(
839 PHASE_SECURITY|PHASE_DECLARATIVE,
840 SENDER_INITIATOR|SENDER_RECEIVER,
841 login->req_buf,
842 payload_length,
843 conn);
844 if (ret < 0)
845 return -1;
846
847 if (ret > 0) {
848 if (login->auth_complete) {
849 pr_err("Initiator has already been"
850 " successfully authenticated, but is still"
851 " sending %s keys.\n", param->value);
852 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
853 ISCSI_LOGIN_STATUS_INIT_ERR);
854 return -1;
855 }
856
857 goto do_auth;
858 } else if (!payload_length) {
859 pr_err("Initiator sent zero length security payload,"
860 " login failed\n");
861 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
862 ISCSI_LOGIN_STATUS_AUTH_FAILED);
863 return -1;
864 }
865
866 if (login->first_request)
867 if (iscsi_target_check_first_request(conn, login) < 0)
868 return -1;
869
870 ret = iscsi_encode_text_output(
871 PHASE_SECURITY|PHASE_DECLARATIVE,
872 SENDER_TARGET,
873 login->rsp_buf,
874 &login->rsp_length,
875 conn->param_list,
876 conn->tpg->tpg_attrib.login_keys_workaround);
877 if (ret < 0)
878 return -1;
879
880 if (!iscsi_check_negotiated_keys(conn->param_list)) {
881 if (conn->tpg->tpg_attrib.authentication &&
882 !strncmp(param->value, NONE, 4)) {
883 pr_err("Initiator sent AuthMethod=None but"
884 " Target is enforcing iSCSI Authentication,"
885 " login failed.\n");
886 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
887 ISCSI_LOGIN_STATUS_AUTH_FAILED);
888 return -1;
889 }
890
891 if (conn->tpg->tpg_attrib.authentication &&
892 !login->auth_complete)
893 return 0;
894
895 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
896 return 0;
897
898 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
899 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
900 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
901 ISCSI_FLAG_LOGIN_TRANSIT;
902 login->current_stage = 1;
903 }
904 }
905
906 return 0;
907 do_auth:
908 return iscsi_target_do_authentication(conn, login);
909 }
910
911 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
912 {
913 int ret;
914 u32 payload_length;
915 struct iscsi_login_req *login_req;
916 struct iscsi_login_rsp *login_rsp;
917
918 login_req = (struct iscsi_login_req *) login->req;
919 login_rsp = (struct iscsi_login_rsp *) login->rsp;
920 payload_length = ntoh24(login_req->dlength);
921
922 ret = iscsi_decode_text_input(
923 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
924 SENDER_INITIATOR|SENDER_RECEIVER,
925 login->req_buf,
926 payload_length,
927 conn);
928 if (ret < 0) {
929 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
930 ISCSI_LOGIN_STATUS_INIT_ERR);
931 return -1;
932 }
933
934 if (login->first_request)
935 if (iscsi_target_check_first_request(conn, login) < 0)
936 return -1;
937
938 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
939 return -1;
940
941 ret = iscsi_encode_text_output(
942 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
943 SENDER_TARGET,
944 login->rsp_buf,
945 &login->rsp_length,
946 conn->param_list,
947 conn->tpg->tpg_attrib.login_keys_workaround);
948 if (ret < 0) {
949 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
950 ISCSI_LOGIN_STATUS_INIT_ERR);
951 return -1;
952 }
953
954 if (!login->auth_complete &&
955 conn->tpg->tpg_attrib.authentication) {
956 pr_err("Initiator is requesting CSG: 1, has not been"
957 " successfully authenticated, and the Target is"
958 " enforcing iSCSI Authentication, login failed.\n");
959 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
960 ISCSI_LOGIN_STATUS_AUTH_FAILED);
961 return -1;
962 }
963
964 if (!iscsi_check_negotiated_keys(conn->param_list))
965 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
966 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
967 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
968 ISCSI_FLAG_LOGIN_TRANSIT;
969
970 return 0;
971 }
972
973 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
974 {
975 int pdu_count = 0;
976 struct iscsi_login_req *login_req;
977 struct iscsi_login_rsp *login_rsp;
978
979 login_req = (struct iscsi_login_req *) login->req;
980 login_rsp = (struct iscsi_login_rsp *) login->rsp;
981
982 while (1) {
983 if (++pdu_count > MAX_LOGIN_PDUS) {
984 pr_err("MAX_LOGIN_PDUS count reached.\n");
985 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
986 ISCSI_LOGIN_STATUS_TARGET_ERROR);
987 return -1;
988 }
989
990 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
991 case 0:
992 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
993 if (iscsi_target_handle_csg_zero(conn, login) < 0)
994 return -1;
995 break;
996 case 1:
997 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
998 if (iscsi_target_handle_csg_one(conn, login) < 0)
999 return -1;
1000 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1001 /*
1002 * Check to make sure the TCP connection has not
1003 * dropped asynchronously while session reinstatement
1004 * was occuring in this kthread context, before
1005 * transitioning to full feature phase operation.
1006 */
1007 if (iscsi_target_sk_check_close(conn))
1008 return -1;
1009
1010 login->tsih = conn->sess->tsih;
1011 login->login_complete = 1;
1012 iscsi_target_restore_sock_callbacks(conn);
1013 if (iscsi_target_do_tx_login_io(conn,
1014 login) < 0)
1015 return -1;
1016 return 1;
1017 }
1018 break;
1019 default:
1020 pr_err("Illegal CSG: %d received from"
1021 " Initiator, protocol error.\n",
1022 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
1023 break;
1024 }
1025
1026 if (iscsi_target_do_tx_login_io(conn, login) < 0)
1027 return -1;
1028
1029 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1030 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
1031 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
1032 }
1033 break;
1034 }
1035
1036 return 0;
1037 }
1038
1039 static void iscsi_initiatorname_tolower(
1040 char *param_buf)
1041 {
1042 char *c;
1043 u32 iqn_size = strlen(param_buf), i;
1044
1045 for (i = 0; i < iqn_size; i++) {
1046 c = &param_buf[i];
1047 if (!isupper(*c))
1048 continue;
1049
1050 *c = tolower(*c);
1051 }
1052 }
1053
1054 /*
1055 * Processes the first Login Request..
1056 */
1057 int iscsi_target_locate_portal(
1058 struct iscsi_np *np,
1059 struct iscsi_conn *conn,
1060 struct iscsi_login *login)
1061 {
1062 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1063 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1064 struct iscsi_session *sess = conn->sess;
1065 struct iscsi_tiqn *tiqn;
1066 struct iscsi_tpg_np *tpg_np = NULL;
1067 struct iscsi_login_req *login_req;
1068 struct se_node_acl *se_nacl;
1069 u32 payload_length, queue_depth = 0;
1070 int sessiontype = 0, ret = 0, tag_num, tag_size;
1071
1072 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1073 iscsi_target_set_sock_callbacks(conn);
1074
1075 login->np = np;
1076
1077 login_req = (struct iscsi_login_req *) login->req;
1078 payload_length = ntoh24(login_req->dlength);
1079
1080 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1081 if (!tmpbuf) {
1082 pr_err("Unable to allocate memory for tmpbuf.\n");
1083 return -1;
1084 }
1085
1086 memcpy(tmpbuf, login->req_buf, payload_length);
1087 tmpbuf[payload_length] = '\0';
1088 start = tmpbuf;
1089 end = (start + payload_length);
1090
1091 /*
1092 * Locate the initial keys expected from the Initiator node in
1093 * the first login request in order to progress with the login phase.
1094 */
1095 while (start < end) {
1096 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1097 ret = -1;
1098 goto out;
1099 }
1100
1101 if (!strncmp(key, "InitiatorName", 13))
1102 i_buf = value;
1103 else if (!strncmp(key, "SessionType", 11))
1104 s_buf = value;
1105 else if (!strncmp(key, "TargetName", 10))
1106 t_buf = value;
1107
1108 start += strlen(key) + strlen(value) + 2;
1109 }
1110 /*
1111 * See 5.3. Login Phase.
1112 */
1113 if (!i_buf) {
1114 pr_err("InitiatorName key not received"
1115 " in first login request.\n");
1116 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1117 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1118 ret = -1;
1119 goto out;
1120 }
1121 /*
1122 * Convert the incoming InitiatorName to lowercase following
1123 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1124 * are NOT case sensitive.
1125 */
1126 iscsi_initiatorname_tolower(i_buf);
1127
1128 if (!s_buf) {
1129 if (!login->leading_connection)
1130 goto get_target;
1131
1132 pr_err("SessionType key not received"
1133 " in first login request.\n");
1134 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1135 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1136 ret = -1;
1137 goto out;
1138 }
1139
1140 /*
1141 * Use default portal group for discovery sessions.
1142 */
1143 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1144 if (!sessiontype) {
1145 conn->tpg = iscsit_global->discovery_tpg;
1146 if (!login->leading_connection)
1147 goto get_target;
1148
1149 sess->sess_ops->SessionType = 1;
1150 /*
1151 * Setup crc32c modules from libcrypto
1152 */
1153 if (iscsi_login_setup_crypto(conn) < 0) {
1154 pr_err("iscsi_login_setup_crypto() failed\n");
1155 ret = -1;
1156 goto out;
1157 }
1158 /*
1159 * Serialize access across the discovery struct iscsi_portal_group to
1160 * process login attempt.
1161 */
1162 if (iscsit_access_np(np, conn->tpg) < 0) {
1163 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1164 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1165 ret = -1;
1166 goto out;
1167 }
1168 ret = 0;
1169 goto alloc_tags;
1170 }
1171
1172 get_target:
1173 if (!t_buf) {
1174 pr_err("TargetName key not received"
1175 " in first login request while"
1176 " SessionType=Normal.\n");
1177 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1178 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1179 ret = -1;
1180 goto out;
1181 }
1182
1183 /*
1184 * Locate Target IQN from Storage Node.
1185 */
1186 tiqn = iscsit_get_tiqn_for_login(t_buf);
1187 if (!tiqn) {
1188 pr_err("Unable to locate Target IQN: %s in"
1189 " Storage Node\n", t_buf);
1190 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1191 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1192 ret = -1;
1193 goto out;
1194 }
1195 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1196
1197 /*
1198 * Locate Target Portal Group from Storage Node.
1199 */
1200 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1201 if (!conn->tpg) {
1202 pr_err("Unable to locate Target Portal Group"
1203 " on %s\n", tiqn->tiqn);
1204 iscsit_put_tiqn_for_login(tiqn);
1205 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1206 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1207 ret = -1;
1208 goto out;
1209 }
1210 conn->tpg_np = tpg_np;
1211 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1212 /*
1213 * Setup crc32c modules from libcrypto
1214 */
1215 if (iscsi_login_setup_crypto(conn) < 0) {
1216 pr_err("iscsi_login_setup_crypto() failed\n");
1217 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1218 iscsit_put_tiqn_for_login(tiqn);
1219 conn->tpg = NULL;
1220 ret = -1;
1221 goto out;
1222 }
1223 /*
1224 * Serialize access across the struct iscsi_portal_group to
1225 * process login attempt.
1226 */
1227 if (iscsit_access_np(np, conn->tpg) < 0) {
1228 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1229 iscsit_put_tiqn_for_login(tiqn);
1230 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1231 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1232 conn->tpg = NULL;
1233 ret = -1;
1234 goto out;
1235 }
1236
1237 /*
1238 * conn->sess->node_acl will be set when the referenced
1239 * struct iscsi_session is located from received ISID+TSIH in
1240 * iscsi_login_non_zero_tsih_s2().
1241 */
1242 if (!login->leading_connection) {
1243 ret = 0;
1244 goto out;
1245 }
1246
1247 /*
1248 * This value is required in iscsi_login_zero_tsih_s2()
1249 */
1250 sess->sess_ops->SessionType = 0;
1251
1252 /*
1253 * Locate incoming Initiator IQN reference from Storage Node.
1254 */
1255 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1256 &conn->tpg->tpg_se_tpg, i_buf);
1257 if (!sess->se_sess->se_node_acl) {
1258 pr_err("iSCSI Initiator Node: %s is not authorized to"
1259 " access iSCSI target portal group: %hu.\n",
1260 i_buf, conn->tpg->tpgt);
1261 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1262 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1263 ret = -1;
1264 goto out;
1265 }
1266 se_nacl = sess->se_sess->se_node_acl;
1267 queue_depth = se_nacl->queue_depth;
1268 /*
1269 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1270 * depth for non immediate commands, plus extra tags for immediate
1271 * commands.
1272 *
1273 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1274 * in per-cpu-ida tag allocation logic + small queue_depth.
1275 */
1276 alloc_tags:
1277 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1278 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1279 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1280
1281 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1282 if (ret < 0) {
1283 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1284 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1285 ret = -1;
1286 }
1287 out:
1288 kfree(tmpbuf);
1289 return ret;
1290 }
1291
1292 int iscsi_target_start_negotiation(
1293 struct iscsi_login *login,
1294 struct iscsi_conn *conn)
1295 {
1296 int ret;
1297
1298 if (conn->sock) {
1299 struct sock *sk = conn->sock->sk;
1300
1301 write_lock_bh(&sk->sk_callback_lock);
1302 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1303 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
1304 write_unlock_bh(&sk->sk_callback_lock);
1305 }
1306 /*
1307 * If iscsi_target_do_login returns zero to signal more PDU
1308 * exchanges are required to complete the login, go ahead and
1309 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection
1310 * is still active.
1311 *
1312 * Otherwise if TCP connection dropped asynchronously, go ahead
1313 * and perform connection cleanup now.
1314 */
1315 ret = iscsi_target_do_login(conn, login);
1316 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
1317 ret = -1;
1318
1319 if (ret < 0) {
1320 cancel_delayed_work_sync(&conn->login_work);
1321 iscsi_target_restore_sock_callbacks(conn);
1322 iscsi_remove_failed_auth_entry(conn);
1323 }
1324 if (ret != 0)
1325 iscsi_target_nego_release(conn);
1326
1327 return ret;
1328 }
1329
1330 void iscsi_target_nego_release(struct iscsi_conn *conn)
1331 {
1332 struct iscsi_login *login = conn->conn_login;
1333
1334 if (!login)
1335 return;
1336
1337 kfree(login->req_buf);
1338 kfree(login->rsp_buf);
1339 kfree(login);
1340
1341 conn->conn_login = NULL;
1342 }
CRIS linux kernel tree