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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / target / iscsi / iscsi_target_nego.c
blob685d771b51d410cacfa4bfc444426f6b6c268cfc
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3 * This file contains main functions related to iSCSI Parameter negotiation.
4 *
5 * (c) Copyright 2007-2013 Datera, Inc.
6 *
7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 *
9 ******************************************************************************/
10
11 #include <linux/ctype.h>
12 #include <linux/kthread.h>
13 #include <linux/slab.h>
14 #include <linux/sched/signal.h>
15 #include <net/sock.h>
16 #include <scsi/iscsi_proto.h>
17 #include <target/target_core_base.h>
18 #include <target/target_core_fabric.h>
19 #include <target/iscsi/iscsi_transport.h>
20
21 #include <target/iscsi/iscsi_target_core.h>
22 #include "iscsi_target_parameters.h"
23 #include "iscsi_target_login.h"
24 #include "iscsi_target_nego.h"
25 #include "iscsi_target_tpg.h"
26 #include "iscsi_target_util.h"
27 #include "iscsi_target.h"
28 #include "iscsi_target_auth.h"
29
30 #define MAX_LOGIN_PDUS 7
31 #define TEXT_LEN 4096
32
33 void convert_null_to_semi(char *buf, int len)
34 {
35 int i;
36
37 for (i = 0; i < len; i++)
38 if (buf[i] == '\0')
39 buf[i] = ';';
40 }
41
42 static int strlen_semi(char *buf)
43 {
44 int i = 0;
45
46 while (buf[i] != '\0') {
47 if (buf[i] == ';')
48 return i;
49 i++;
50 }
51
52 return -1;
53 }
54
55 int extract_param(
56 const char *in_buf,
57 const char *pattern,
58 unsigned int max_length,
59 char *out_buf,
60 unsigned char *type)
61 {
62 char *ptr;
63 int len;
64
65 if (!in_buf || !pattern || !out_buf || !type)
66 return -1;
67
68 ptr = strstr(in_buf, pattern);
69 if (!ptr)
70 return -1;
71
72 ptr = strstr(ptr, "=");
73 if (!ptr)
74 return -1;
75
76 ptr += 1;
77 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
78 ptr += 2; /* skip 0x */
79 *type = HEX;
80 } else
81 *type = DECIMAL;
82
83 len = strlen_semi(ptr);
84 if (len < 0)
85 return -1;
86
87 if (len >= max_length) {
88 pr_err("Length of input: %d exceeds max_length:"
89 " %d\n", len, max_length);
90 return -1;
91 }
92 memcpy(out_buf, ptr, len);
93 out_buf[len] = '\0';
94
95 return 0;
96 }
97
98 static u32 iscsi_handle_authentication(
99 struct iscsi_conn *conn,
100 char *in_buf,
101 char *out_buf,
102 int in_length,
103 int *out_length,
104 unsigned char *authtype)
105 {
106 struct iscsi_session *sess = conn->sess;
107 struct iscsi_node_auth *auth;
108 struct iscsi_node_acl *iscsi_nacl;
109 struct iscsi_portal_group *iscsi_tpg;
110 struct se_node_acl *se_nacl;
111
112 if (!sess->sess_ops->SessionType) {
113 /*
114 * For SessionType=Normal
115 */
116 se_nacl = conn->sess->se_sess->se_node_acl;
117 if (!se_nacl) {
118 pr_err("Unable to locate struct se_node_acl for"
119 " CHAP auth\n");
120 return -1;
121 }
122 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
123 se_node_acl);
124 if (!iscsi_nacl) {
125 pr_err("Unable to locate struct iscsi_node_acl for"
126 " CHAP auth\n");
127 return -1;
128 }
129
130 if (se_nacl->dynamic_node_acl) {
131 iscsi_tpg = container_of(se_nacl->se_tpg,
132 struct iscsi_portal_group, tpg_se_tpg);
133
134 auth = &iscsi_tpg->tpg_demo_auth;
135 } else {
136 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
137 se_node_acl);
138
139 auth = &iscsi_nacl->node_auth;
140 }
141 } else {
142 /*
143 * For SessionType=Discovery
144 */
145 auth = &iscsit_global->discovery_acl.node_auth;
146 }
147
148 if (strstr("CHAP", authtype))
149 strcpy(conn->sess->auth_type, "CHAP");
150 else
151 strcpy(conn->sess->auth_type, NONE);
152
153 if (strstr("None", authtype))
154 return 1;
155 else if (strstr("CHAP", authtype))
156 return chap_main_loop(conn, auth, in_buf, out_buf,
157 &in_length, out_length);
158 /* SRP, SPKM1, SPKM2 and KRB5 are unsupported */
159 return 2;
160 }
161
162 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
163 {
164 kfree(conn->auth_protocol);
165 }
166
167 int iscsi_target_check_login_request(
168 struct iscsi_conn *conn,
169 struct iscsi_login *login)
170 {
171 int req_csg, req_nsg;
172 u32 payload_length;
173 struct iscsi_login_req *login_req;
174
175 login_req = (struct iscsi_login_req *) login->req;
176 payload_length = ntoh24(login_req->dlength);
177
178 switch (login_req->opcode & ISCSI_OPCODE_MASK) {
179 case ISCSI_OP_LOGIN:
180 break;
181 default:
182 pr_err("Received unknown opcode 0x%02x.\n",
183 login_req->opcode & ISCSI_OPCODE_MASK);
184 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
185 ISCSI_LOGIN_STATUS_INIT_ERR);
186 return -1;
187 }
188
189 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
190 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
191 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
192 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
193 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
194 ISCSI_LOGIN_STATUS_INIT_ERR);
195 return -1;
196 }
197
198 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
199 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
200
201 if (req_csg != login->current_stage) {
202 pr_err("Initiator unexpectedly changed login stage"
203 " from %d to %d, login failed.\n", login->current_stage,
204 req_csg);
205 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
206 ISCSI_LOGIN_STATUS_INIT_ERR);
207 return -1;
208 }
209
210 if ((req_nsg == 2) || (req_csg >= 2) ||
211 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
212 (req_nsg <= req_csg))) {
213 pr_err("Illegal login_req->flags Combination, CSG: %d,"
214 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
215 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
216 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
217 ISCSI_LOGIN_STATUS_INIT_ERR);
218 return -1;
219 }
220
221 if ((login_req->max_version != login->version_max) ||
222 (login_req->min_version != login->version_min)) {
223 pr_err("Login request changed Version Max/Nin"
224 " unexpectedly to 0x%02x/0x%02x, protocol error\n",
225 login_req->max_version, login_req->min_version);
226 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
227 ISCSI_LOGIN_STATUS_INIT_ERR);
228 return -1;
229 }
230
231 if (memcmp(login_req->isid, login->isid, 6) != 0) {
232 pr_err("Login request changed ISID unexpectedly,"
233 " protocol error.\n");
234 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
235 ISCSI_LOGIN_STATUS_INIT_ERR);
236 return -1;
237 }
238
239 if (login_req->itt != login->init_task_tag) {
240 pr_err("Login request changed ITT unexpectedly to"
241 " 0x%08x, protocol error.\n", login_req->itt);
242 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
243 ISCSI_LOGIN_STATUS_INIT_ERR);
244 return -1;
245 }
246
247 if (payload_length > MAX_KEY_VALUE_PAIRS) {
248 pr_err("Login request payload exceeds default"
249 " MaxRecvDataSegmentLength: %u, protocol error.\n",
250 MAX_KEY_VALUE_PAIRS);
251 return -1;
252 }
253
254 return 0;
255 }
256 EXPORT_SYMBOL(iscsi_target_check_login_request);
257
258 static int iscsi_target_check_first_request(
259 struct iscsi_conn *conn,
260 struct iscsi_login *login)
261 {
262 struct iscsi_param *param = NULL;
263 struct se_node_acl *se_nacl;
264
265 login->first_request = 0;
266
267 list_for_each_entry(param, &conn->param_list->param_list, p_list) {
268 if (!strncmp(param->name, SESSIONTYPE, 11)) {
269 if (!IS_PSTATE_ACCEPTOR(param)) {
270 pr_err("SessionType key not received"
271 " in first login request.\n");
272 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
273 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
274 return -1;
275 }
276 if (!strncmp(param->value, DISCOVERY, 9))
277 return 0;
278 }
279
280 if (!strncmp(param->name, INITIATORNAME, 13)) {
281 if (!IS_PSTATE_ACCEPTOR(param)) {
282 if (!login->leading_connection)
283 continue;
284
285 pr_err("InitiatorName key not received"
286 " in first login request.\n");
287 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
288 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
289 return -1;
290 }
291
292 /*
293 * For non-leading connections, double check that the
294 * received InitiatorName matches the existing session's
295 * struct iscsi_node_acl.
296 */
297 if (!login->leading_connection) {
298 se_nacl = conn->sess->se_sess->se_node_acl;
299 if (!se_nacl) {
300 pr_err("Unable to locate"
301 " struct se_node_acl\n");
302 iscsit_tx_login_rsp(conn,
303 ISCSI_STATUS_CLS_INITIATOR_ERR,
304 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
305 return -1;
306 }
307
308 if (strcmp(param->value,
309 se_nacl->initiatorname)) {
310 pr_err("Incorrect"
311 " InitiatorName: %s for this"
312 " iSCSI Initiator Node.\n",
313 param->value);
314 iscsit_tx_login_rsp(conn,
315 ISCSI_STATUS_CLS_INITIATOR_ERR,
316 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
317 return -1;
318 }
319 }
320 }
321 }
322
323 return 0;
324 }
325
326 static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
327 {
328 u32 padding = 0;
329 struct iscsi_login_rsp *login_rsp;
330
331 login_rsp = (struct iscsi_login_rsp *) login->rsp;
332
333 login_rsp->opcode = ISCSI_OP_LOGIN_RSP;
334 hton24(login_rsp->dlength, login->rsp_length);
335 memcpy(login_rsp->isid, login->isid, 6);
336 login_rsp->tsih = cpu_to_be16(login->tsih);
337 login_rsp->itt = login->init_task_tag;
338 login_rsp->statsn = cpu_to_be32(conn->stat_sn++);
339 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
340 login_rsp->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
341
342 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
343 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
344 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
345 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
346 ntohl(login_rsp->statsn), login->rsp_length);
347
348 padding = ((-login->rsp_length) & 3);
349 /*
350 * Before sending the last login response containing the transition
351 * bit for full-feature-phase, go ahead and start up TX/RX threads
352 * now to avoid potential resource allocation failures after the
353 * final login response has been sent.
354 */
355 if (login->login_complete) {
356 int rc = iscsit_start_kthreads(conn);
357 if (rc) {
358 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
359 ISCSI_LOGIN_STATUS_NO_RESOURCES);
360 return -1;
361 }
362 }
363
364 if (conn->conn_transport->iscsit_put_login_tx(conn, login,
365 login->rsp_length + padding) < 0)
366 goto err;
367
368 login->rsp_length = 0;
369
370 return 0;
371
372 err:
373 if (login->login_complete) {
374 if (conn->rx_thread && conn->rx_thread_active) {
375 send_sig(SIGINT, conn->rx_thread, 1);
376 complete(&conn->rx_login_comp);
377 kthread_stop(conn->rx_thread);
378 }
379 if (conn->tx_thread && conn->tx_thread_active) {
380 send_sig(SIGINT, conn->tx_thread, 1);
381 kthread_stop(conn->tx_thread);
382 }
383 spin_lock(&iscsit_global->ts_bitmap_lock);
384 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
385 get_order(1));
386 spin_unlock(&iscsit_global->ts_bitmap_lock);
387 }
388 return -1;
389 }
390
391 static void iscsi_target_sk_data_ready(struct sock *sk)
392 {
393 struct iscsi_conn *conn = sk->sk_user_data;
394 bool rc;
395
396 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
397
398 write_lock_bh(&sk->sk_callback_lock);
399 if (!sk->sk_user_data) {
400 write_unlock_bh(&sk->sk_callback_lock);
401 return;
402 }
403 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
404 write_unlock_bh(&sk->sk_callback_lock);
405 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
406 return;
407 }
408 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
409 write_unlock_bh(&sk->sk_callback_lock);
410 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
411 return;
412 }
413 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
414 write_unlock_bh(&sk->sk_callback_lock);
415 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
416 if (iscsi_target_sk_data_ready == conn->orig_data_ready)
417 return;
418 conn->orig_data_ready(sk);
419 return;
420 }
421
422 rc = schedule_delayed_work(&conn->login_work, 0);
423 if (!rc) {
424 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
425 " got false\n");
426 }
427 write_unlock_bh(&sk->sk_callback_lock);
428 }
429
430 static void iscsi_target_sk_state_change(struct sock *);
431
432 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
433 {
434 struct sock *sk;
435
436 if (!conn->sock)
437 return;
438
439 sk = conn->sock->sk;
440 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
441
442 write_lock_bh(&sk->sk_callback_lock);
443 sk->sk_user_data = conn;
444 conn->orig_data_ready = sk->sk_data_ready;
445 conn->orig_state_change = sk->sk_state_change;
446 sk->sk_data_ready = iscsi_target_sk_data_ready;
447 sk->sk_state_change = iscsi_target_sk_state_change;
448 write_unlock_bh(&sk->sk_callback_lock);
449
450 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
451 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
452 }
453
454 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
455 {
456 struct sock *sk;
457
458 if (!conn->sock)
459 return;
460
461 sk = conn->sock->sk;
462 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
463
464 write_lock_bh(&sk->sk_callback_lock);
465 if (!sk->sk_user_data) {
466 write_unlock_bh(&sk->sk_callback_lock);
467 return;
468 }
469 sk->sk_user_data = NULL;
470 sk->sk_data_ready = conn->orig_data_ready;
471 sk->sk_state_change = conn->orig_state_change;
472 write_unlock_bh(&sk->sk_callback_lock);
473
474 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
475 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
476 }
477
478 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
479
480 static bool __iscsi_target_sk_check_close(struct sock *sk)
481 {
482 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
483 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE,"
484 "returning FALSE\n");
485 return true;
486 }
487 return false;
488 }
489
490 static bool iscsi_target_sk_check_close(struct iscsi_conn *conn)
491 {
492 bool state = false;
493
494 if (conn->sock) {
495 struct sock *sk = conn->sock->sk;
496
497 read_lock_bh(&sk->sk_callback_lock);
498 state = (__iscsi_target_sk_check_close(sk) ||
499 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
500 read_unlock_bh(&sk->sk_callback_lock);
501 }
502 return state;
503 }
504
505 static bool iscsi_target_sk_check_flag(struct iscsi_conn *conn, unsigned int flag)
506 {
507 bool state = false;
508
509 if (conn->sock) {
510 struct sock *sk = conn->sock->sk;
511
512 read_lock_bh(&sk->sk_callback_lock);
513 state = test_bit(flag, &conn->login_flags);
514 read_unlock_bh(&sk->sk_callback_lock);
515 }
516 return state;
517 }
518
519 static bool iscsi_target_sk_check_and_clear(struct iscsi_conn *conn, unsigned int flag)
520 {
521 bool state = false;
522
523 if (conn->sock) {
524 struct sock *sk = conn->sock->sk;
525
526 write_lock_bh(&sk->sk_callback_lock);
527 state = (__iscsi_target_sk_check_close(sk) ||
528 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
529 if (!state)
530 clear_bit(flag, &conn->login_flags);
531 write_unlock_bh(&sk->sk_callback_lock);
532 }
533 return state;
534 }
535
536 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
537 {
538 struct iscsi_np *np = login->np;
539 bool zero_tsih = login->zero_tsih;
540
541 iscsi_remove_failed_auth_entry(conn);
542 iscsi_target_nego_release(conn);
543 iscsi_target_login_sess_out(conn, np, zero_tsih, true);
544 }
545
546 struct conn_timeout {
547 struct timer_list timer;
548 struct iscsi_conn *conn;
549 };
550
551 static void iscsi_target_login_timeout(struct timer_list *t)
552 {
553 struct conn_timeout *timeout = from_timer(timeout, t, timer);
554 struct iscsi_conn *conn = timeout->conn;
555
556 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
557
558 if (conn->login_kworker) {
559 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
560 conn->login_kworker->comm, conn->login_kworker->pid);
561 send_sig(SIGINT, conn->login_kworker, 1);
562 }
563 }
564
565 static void iscsi_target_do_login_rx(struct work_struct *work)
566 {
567 struct iscsi_conn *conn = container_of(work,
568 struct iscsi_conn, login_work.work);
569 struct iscsi_login *login = conn->login;
570 struct iscsi_np *np = login->np;
571 struct iscsi_portal_group *tpg = conn->tpg;
572 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
573 struct conn_timeout timeout;
574 int rc, zero_tsih = login->zero_tsih;
575 bool state;
576
577 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
578 conn, current->comm, current->pid);
579 /*
580 * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready()
581 * before initial PDU processing in iscsi_target_start_negotiation()
582 * has completed, go ahead and retry until it's cleared.
583 *
584 * Otherwise if the TCP connection drops while this is occuring,
585 * iscsi_target_start_negotiation() will detect the failure, call
586 * cancel_delayed_work_sync(&conn->login_work), and cleanup the
587 * remaining iscsi connection resources from iscsi_np process context.
588 */
589 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) {
590 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10));
591 return;
592 }
593
594 spin_lock(&tpg->tpg_state_lock);
595 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
596 spin_unlock(&tpg->tpg_state_lock);
597
598 if (!state) {
599 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
600 goto err;
601 }
602
603 if (iscsi_target_sk_check_close(conn)) {
604 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
605 goto err;
606 }
607
608 conn->login_kworker = current;
609 allow_signal(SIGINT);
610
611 timeout.conn = conn;
612 timer_setup_on_stack(&timeout.timer, iscsi_target_login_timeout, 0);
613 mod_timer(&timeout.timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
614 pr_debug("Starting login timer for %s/%d\n", current->comm, current->pid);
615
616 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
617 del_timer_sync(&timeout.timer);
618 destroy_timer_on_stack(&timeout.timer);
619 flush_signals(current);
620 conn->login_kworker = NULL;
621
622 if (rc < 0)
623 goto err;
624
625 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
626 conn, current->comm, current->pid);
627
628 rc = iscsi_target_do_login(conn, login);
629 if (rc < 0) {
630 goto err;
631 } else if (!rc) {
632 if (iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_READ_ACTIVE))
633 goto err;
634 } else if (rc == 1) {
635 iscsi_target_nego_release(conn);
636 iscsi_post_login_handler(np, conn, zero_tsih);
637 iscsit_deaccess_np(np, tpg, tpg_np);
638 }
639 return;
640
641 err:
642 iscsi_target_restore_sock_callbacks(conn);
643 iscsi_target_login_drop(conn, login);
644 iscsit_deaccess_np(np, tpg, tpg_np);
645 }
646
647 static void iscsi_target_sk_state_change(struct sock *sk)
648 {
649 struct iscsi_conn *conn;
650 void (*orig_state_change)(struct sock *);
651 bool state;
652
653 pr_debug("Entering iscsi_target_sk_state_change\n");
654
655 write_lock_bh(&sk->sk_callback_lock);
656 conn = sk->sk_user_data;
657 if (!conn) {
658 write_unlock_bh(&sk->sk_callback_lock);
659 return;
660 }
661 orig_state_change = conn->orig_state_change;
662
663 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
664 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
665 conn);
666 write_unlock_bh(&sk->sk_callback_lock);
667 orig_state_change(sk);
668 return;
669 }
670 state = __iscsi_target_sk_check_close(sk);
671 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state);
672
673 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
674 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
675 " conn: %p\n", conn);
676 if (state)
677 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
678 write_unlock_bh(&sk->sk_callback_lock);
679 orig_state_change(sk);
680 return;
681 }
682 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
683 pr_debug("Got LOGIN_FLAGS_CLOSED=1 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 /*
690 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED,
691 * but only queue conn->login_work -> iscsi_target_do_login_rx()
692 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared.
693 *
694 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close()
695 * will detect the dropped TCP connection from delayed workqueue context.
696 *
697 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial
698 * iscsi_target_start_negotiation() is running, iscsi_target_do_login()
699 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation()
700 * via iscsi_target_sk_check_and_clear() is responsible for detecting the
701 * dropped TCP connection in iscsi_np process context, and cleaning up
702 * the remaining iscsi connection resources.
703 */
704 if (state) {
705 pr_debug("iscsi_target_sk_state_change got failed state\n");
706 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
707 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
708 write_unlock_bh(&sk->sk_callback_lock);
709
710 orig_state_change(sk);
711
712 if (!state)
713 schedule_delayed_work(&conn->login_work, 0);
714 return;
715 }
716 write_unlock_bh(&sk->sk_callback_lock);
717
718 orig_state_change(sk);
719 }
720
721 /*
722 * NOTE: We check for existing sessions or connections AFTER the initiator
723 * has been successfully authenticated in order to protect against faked
724 * ISID/TSIH combinations.
725 */
726 static int iscsi_target_check_for_existing_instances(
727 struct iscsi_conn *conn,
728 struct iscsi_login *login)
729 {
730 if (login->checked_for_existing)
731 return 0;
732
733 login->checked_for_existing = 1;
734
735 if (!login->tsih)
736 return iscsi_check_for_session_reinstatement(conn);
737 else
738 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
739 login->initial_exp_statsn);
740 }
741
742 static int iscsi_target_do_authentication(
743 struct iscsi_conn *conn,
744 struct iscsi_login *login)
745 {
746 int authret;
747 u32 payload_length;
748 struct iscsi_param *param;
749 struct iscsi_login_req *login_req;
750 struct iscsi_login_rsp *login_rsp;
751
752 login_req = (struct iscsi_login_req *) login->req;
753 login_rsp = (struct iscsi_login_rsp *) login->rsp;
754 payload_length = ntoh24(login_req->dlength);
755
756 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
757 if (!param)
758 return -1;
759
760 authret = iscsi_handle_authentication(
761 conn,
762 login->req_buf,
763 login->rsp_buf,
764 payload_length,
765 &login->rsp_length,
766 param->value);
767 switch (authret) {
768 case 0:
769 pr_debug("Received OK response"
770 " from LIO Authentication, continuing.\n");
771 break;
772 case 1:
773 pr_debug("iSCSI security negotiation"
774 " completed successfully.\n");
775 login->auth_complete = 1;
776 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
777 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
778 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
779 ISCSI_FLAG_LOGIN_TRANSIT);
780 login->current_stage = 1;
781 }
782 return iscsi_target_check_for_existing_instances(
783 conn, login);
784 case 2:
785 pr_err("Security negotiation"
786 " failed.\n");
787 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
788 ISCSI_LOGIN_STATUS_AUTH_FAILED);
789 return -1;
790 default:
791 pr_err("Received unknown error %d from LIO"
792 " Authentication\n", authret);
793 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
794 ISCSI_LOGIN_STATUS_TARGET_ERROR);
795 return -1;
796 }
797
798 return 0;
799 }
800
801 static int iscsi_target_handle_csg_zero(
802 struct iscsi_conn *conn,
803 struct iscsi_login *login)
804 {
805 int ret;
806 u32 payload_length;
807 struct iscsi_param *param;
808 struct iscsi_login_req *login_req;
809 struct iscsi_login_rsp *login_rsp;
810
811 login_req = (struct iscsi_login_req *) login->req;
812 login_rsp = (struct iscsi_login_rsp *) login->rsp;
813 payload_length = ntoh24(login_req->dlength);
814
815 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
816 if (!param)
817 return -1;
818
819 ret = iscsi_decode_text_input(
820 PHASE_SECURITY|PHASE_DECLARATIVE,
821 SENDER_INITIATOR|SENDER_RECEIVER,
822 login->req_buf,
823 payload_length,
824 conn);
825 if (ret < 0)
826 return -1;
827
828 if (ret > 0) {
829 if (login->auth_complete) {
830 pr_err("Initiator has already been"
831 " successfully authenticated, but is still"
832 " sending %s keys.\n", param->value);
833 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
834 ISCSI_LOGIN_STATUS_INIT_ERR);
835 return -1;
836 }
837
838 goto do_auth;
839 } else if (!payload_length) {
840 pr_err("Initiator sent zero length security payload,"
841 " login failed\n");
842 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
843 ISCSI_LOGIN_STATUS_AUTH_FAILED);
844 return -1;
845 }
846
847 if (login->first_request)
848 if (iscsi_target_check_first_request(conn, login) < 0)
849 return -1;
850
851 ret = iscsi_encode_text_output(
852 PHASE_SECURITY|PHASE_DECLARATIVE,
853 SENDER_TARGET,
854 login->rsp_buf,
855 &login->rsp_length,
856 conn->param_list,
857 conn->tpg->tpg_attrib.login_keys_workaround);
858 if (ret < 0)
859 return -1;
860
861 if (!iscsi_check_negotiated_keys(conn->param_list)) {
862 if (conn->tpg->tpg_attrib.authentication &&
863 !strncmp(param->value, NONE, 4)) {
864 pr_err("Initiator sent AuthMethod=None but"
865 " Target is enforcing iSCSI Authentication,"
866 " login failed.\n");
867 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
868 ISCSI_LOGIN_STATUS_AUTH_FAILED);
869 return -1;
870 }
871
872 if (conn->tpg->tpg_attrib.authentication &&
873 !login->auth_complete)
874 return 0;
875
876 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
877 return 0;
878
879 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
880 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
881 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
882 ISCSI_FLAG_LOGIN_TRANSIT;
883 login->current_stage = 1;
884 }
885 }
886
887 return 0;
888 do_auth:
889 return iscsi_target_do_authentication(conn, login);
890 }
891
892 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
893 {
894 int ret;
895 u32 payload_length;
896 struct iscsi_login_req *login_req;
897 struct iscsi_login_rsp *login_rsp;
898
899 login_req = (struct iscsi_login_req *) login->req;
900 login_rsp = (struct iscsi_login_rsp *) login->rsp;
901 payload_length = ntoh24(login_req->dlength);
902
903 ret = iscsi_decode_text_input(
904 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
905 SENDER_INITIATOR|SENDER_RECEIVER,
906 login->req_buf,
907 payload_length,
908 conn);
909 if (ret < 0) {
910 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
911 ISCSI_LOGIN_STATUS_INIT_ERR);
912 return -1;
913 }
914
915 if (login->first_request)
916 if (iscsi_target_check_first_request(conn, login) < 0)
917 return -1;
918
919 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
920 return -1;
921
922 ret = iscsi_encode_text_output(
923 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
924 SENDER_TARGET,
925 login->rsp_buf,
926 &login->rsp_length,
927 conn->param_list,
928 conn->tpg->tpg_attrib.login_keys_workaround);
929 if (ret < 0) {
930 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
931 ISCSI_LOGIN_STATUS_INIT_ERR);
932 return -1;
933 }
934
935 if (!login->auth_complete &&
936 conn->tpg->tpg_attrib.authentication) {
937 pr_err("Initiator is requesting CSG: 1, has not been"
938 " successfully authenticated, and the Target is"
939 " enforcing iSCSI Authentication, login failed.\n");
940 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
941 ISCSI_LOGIN_STATUS_AUTH_FAILED);
942 return -1;
943 }
944
945 if (!iscsi_check_negotiated_keys(conn->param_list))
946 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
947 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
948 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
949 ISCSI_FLAG_LOGIN_TRANSIT;
950
951 return 0;
952 }
953
954 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
955 {
956 int pdu_count = 0;
957 struct iscsi_login_req *login_req;
958 struct iscsi_login_rsp *login_rsp;
959
960 login_req = (struct iscsi_login_req *) login->req;
961 login_rsp = (struct iscsi_login_rsp *) login->rsp;
962
963 while (1) {
964 if (++pdu_count > MAX_LOGIN_PDUS) {
965 pr_err("MAX_LOGIN_PDUS count reached.\n");
966 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
967 ISCSI_LOGIN_STATUS_TARGET_ERROR);
968 return -1;
969 }
970
971 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
972 case 0:
973 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
974 if (iscsi_target_handle_csg_zero(conn, login) < 0)
975 return -1;
976 break;
977 case 1:
978 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
979 if (iscsi_target_handle_csg_one(conn, login) < 0)
980 return -1;
981 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
982 /*
983 * Check to make sure the TCP connection has not
984 * dropped asynchronously while session reinstatement
985 * was occuring in this kthread context, before
986 * transitioning to full feature phase operation.
987 */
988 if (iscsi_target_sk_check_close(conn))
989 return -1;
990
991 login->tsih = conn->sess->tsih;
992 login->login_complete = 1;
993 iscsi_target_restore_sock_callbacks(conn);
994 if (iscsi_target_do_tx_login_io(conn,
995 login) < 0)
996 return -1;
997 return 1;
998 }
999 break;
1000 default:
1001 pr_err("Illegal CSG: %d received from"
1002 " Initiator, protocol error.\n",
1003 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
1004 break;
1005 }
1006
1007 if (iscsi_target_do_tx_login_io(conn, login) < 0)
1008 return -1;
1009
1010 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1011 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
1012 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
1013 }
1014 break;
1015 }
1016
1017 return 0;
1018 }
1019
1020 static void iscsi_initiatorname_tolower(
1021 char *param_buf)
1022 {
1023 char *c;
1024 u32 iqn_size = strlen(param_buf), i;
1025
1026 for (i = 0; i < iqn_size; i++) {
1027 c = &param_buf[i];
1028 if (!isupper(*c))
1029 continue;
1030
1031 *c = tolower(*c);
1032 }
1033 }
1034
1035 /*
1036 * Processes the first Login Request..
1037 */
1038 int iscsi_target_locate_portal(
1039 struct iscsi_np *np,
1040 struct iscsi_conn *conn,
1041 struct iscsi_login *login)
1042 {
1043 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1044 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1045 struct iscsi_session *sess = conn->sess;
1046 struct iscsi_tiqn *tiqn;
1047 struct iscsi_tpg_np *tpg_np = NULL;
1048 struct iscsi_login_req *login_req;
1049 struct se_node_acl *se_nacl;
1050 u32 payload_length, queue_depth = 0;
1051 int sessiontype = 0, ret = 0, tag_num, tag_size;
1052
1053 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1054 iscsi_target_set_sock_callbacks(conn);
1055
1056 login->np = np;
1057
1058 login_req = (struct iscsi_login_req *) login->req;
1059 payload_length = ntoh24(login_req->dlength);
1060
1061 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1062 if (!tmpbuf) {
1063 pr_err("Unable to allocate memory for tmpbuf.\n");
1064 return -1;
1065 }
1066
1067 memcpy(tmpbuf, login->req_buf, payload_length);
1068 tmpbuf[payload_length] = '\0';
1069 start = tmpbuf;
1070 end = (start + payload_length);
1071
1072 /*
1073 * Locate the initial keys expected from the Initiator node in
1074 * the first login request in order to progress with the login phase.
1075 */
1076 while (start < end) {
1077 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1078 ret = -1;
1079 goto out;
1080 }
1081
1082 if (!strncmp(key, "InitiatorName", 13))
1083 i_buf = value;
1084 else if (!strncmp(key, "SessionType", 11))
1085 s_buf = value;
1086 else if (!strncmp(key, "TargetName", 10))
1087 t_buf = value;
1088
1089 start += strlen(key) + strlen(value) + 2;
1090 }
1091 /*
1092 * See 5.3. Login Phase.
1093 */
1094 if (!i_buf) {
1095 pr_err("InitiatorName key not received"
1096 " in first login request.\n");
1097 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1098 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1099 ret = -1;
1100 goto out;
1101 }
1102 /*
1103 * Convert the incoming InitiatorName to lowercase following
1104 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1105 * are NOT case sensitive.
1106 */
1107 iscsi_initiatorname_tolower(i_buf);
1108
1109 if (!s_buf) {
1110 if (!login->leading_connection)
1111 goto get_target;
1112
1113 pr_err("SessionType key not received"
1114 " in first login request.\n");
1115 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1116 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1117 ret = -1;
1118 goto out;
1119 }
1120
1121 /*
1122 * Use default portal group for discovery sessions.
1123 */
1124 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1125 if (!sessiontype) {
1126 conn->tpg = iscsit_global->discovery_tpg;
1127 if (!login->leading_connection)
1128 goto get_target;
1129
1130 sess->sess_ops->SessionType = 1;
1131 /*
1132 * Setup crc32c modules from libcrypto
1133 */
1134 if (iscsi_login_setup_crypto(conn) < 0) {
1135 pr_err("iscsi_login_setup_crypto() failed\n");
1136 ret = -1;
1137 goto out;
1138 }
1139 /*
1140 * Serialize access across the discovery struct iscsi_portal_group to
1141 * process login attempt.
1142 */
1143 if (iscsit_access_np(np, conn->tpg) < 0) {
1144 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1145 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1146 ret = -1;
1147 goto out;
1148 }
1149 ret = 0;
1150 goto alloc_tags;
1151 }
1152
1153 get_target:
1154 if (!t_buf) {
1155 pr_err("TargetName key not received"
1156 " in first login request while"
1157 " SessionType=Normal.\n");
1158 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1159 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1160 ret = -1;
1161 goto out;
1162 }
1163
1164 /*
1165 * Locate Target IQN from Storage Node.
1166 */
1167 tiqn = iscsit_get_tiqn_for_login(t_buf);
1168 if (!tiqn) {
1169 pr_err("Unable to locate Target IQN: %s in"
1170 " Storage Node\n", t_buf);
1171 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1172 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1173 ret = -1;
1174 goto out;
1175 }
1176 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1177
1178 /*
1179 * Locate Target Portal Group from Storage Node.
1180 */
1181 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1182 if (!conn->tpg) {
1183 pr_err("Unable to locate Target Portal Group"
1184 " on %s\n", tiqn->tiqn);
1185 iscsit_put_tiqn_for_login(tiqn);
1186 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1187 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1188 ret = -1;
1189 goto out;
1190 }
1191 conn->tpg_np = tpg_np;
1192 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1193 /*
1194 * Setup crc32c modules from libcrypto
1195 */
1196 if (iscsi_login_setup_crypto(conn) < 0) {
1197 pr_err("iscsi_login_setup_crypto() failed\n");
1198 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1199 iscsit_put_tiqn_for_login(tiqn);
1200 conn->tpg = NULL;
1201 ret = -1;
1202 goto out;
1203 }
1204 /*
1205 * Serialize access across the struct iscsi_portal_group to
1206 * process login attempt.
1207 */
1208 if (iscsit_access_np(np, conn->tpg) < 0) {
1209 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1210 iscsit_put_tiqn_for_login(tiqn);
1211 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1212 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1213 conn->tpg = NULL;
1214 ret = -1;
1215 goto out;
1216 }
1217
1218 /*
1219 * conn->sess->node_acl will be set when the referenced
1220 * struct iscsi_session is located from received ISID+TSIH in
1221 * iscsi_login_non_zero_tsih_s2().
1222 */
1223 if (!login->leading_connection) {
1224 ret = 0;
1225 goto out;
1226 }
1227
1228 /*
1229 * This value is required in iscsi_login_zero_tsih_s2()
1230 */
1231 sess->sess_ops->SessionType = 0;
1232
1233 /*
1234 * Locate incoming Initiator IQN reference from Storage Node.
1235 */
1236 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1237 &conn->tpg->tpg_se_tpg, i_buf);
1238 if (!sess->se_sess->se_node_acl) {
1239 pr_err("iSCSI Initiator Node: %s is not authorized to"
1240 " access iSCSI target portal group: %hu.\n",
1241 i_buf, conn->tpg->tpgt);
1242 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1243 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1244 ret = -1;
1245 goto out;
1246 }
1247 se_nacl = sess->se_sess->se_node_acl;
1248 queue_depth = se_nacl->queue_depth;
1249 /*
1250 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1251 * depth for non immediate commands, plus extra tags for immediate
1252 * commands.
1253 *
1254 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1255 * in per-cpu-ida tag allocation logic + small queue_depth.
1256 */
1257 alloc_tags:
1258 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1259 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1260 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1261
1262 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1263 if (ret < 0) {
1264 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1265 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1266 ret = -1;
1267 }
1268 out:
1269 kfree(tmpbuf);
1270 return ret;
1271 }
1272
1273 int iscsi_target_start_negotiation(
1274 struct iscsi_login *login,
1275 struct iscsi_conn *conn)
1276 {
1277 int ret;
1278
1279 if (conn->sock) {
1280 struct sock *sk = conn->sock->sk;
1281
1282 write_lock_bh(&sk->sk_callback_lock);
1283 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1284 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
1285 write_unlock_bh(&sk->sk_callback_lock);
1286 }
1287 /*
1288 * If iscsi_target_do_login returns zero to signal more PDU
1289 * exchanges are required to complete the login, go ahead and
1290 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection
1291 * is still active.
1292 *
1293 * Otherwise if TCP connection dropped asynchronously, go ahead
1294 * and perform connection cleanup now.
1295 */
1296 ret = iscsi_target_do_login(conn, login);
1297 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
1298 ret = -1;
1299
1300 if (ret < 0) {
1301 cancel_delayed_work_sync(&conn->login_work);
1302 iscsi_target_restore_sock_callbacks(conn);
1303 iscsi_remove_failed_auth_entry(conn);
1304 }
1305 if (ret != 0)
1306 iscsi_target_nego_release(conn);
1307
1308 return ret;
1309 }
1310
1311 void iscsi_target_nego_release(struct iscsi_conn *conn)
1312 {
1313 struct iscsi_login *login = conn->conn_login;
1314
1315 if (!login)
1316 return;
1317
1318 kfree(login->req_buf);
1319 kfree(login->rsp_buf);
1320 kfree(login);
1321
1322 conn->conn_login = NULL;
1323 }
Linux with added FPC-III support