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[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / drivers / target / iscsi / iscsi_target_nego.c
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 <scsi/iscsi_proto.h>
22 #include <target/target_core_base.h>
23 #include <target/target_core_fabric.h>
24 #include <target/iscsi/iscsi_transport.h>
25
26 #include <target/iscsi/iscsi_target_core.h>
27 #include "iscsi_target_parameters.h"
28 #include "iscsi_target_login.h"
29 #include "iscsi_target_nego.h"
30 #include "iscsi_target_tpg.h"
31 #include "iscsi_target_util.h"
32 #include "iscsi_target.h"
33 #include "iscsi_target_auth.h"
34
35 #define MAX_LOGIN_PDUS 7
36 #define TEXT_LEN 4096
37
38 void convert_null_to_semi(char *buf, int len)
39 {
40 int i;
41
42 for (i = 0; i < len; i++)
43 if (buf[i] == '\0')
44 buf[i] = ';';
45 }
46
47 static int strlen_semi(char *buf)
48 {
49 int i = 0;
50
51 while (buf[i] != '\0') {
52 if (buf[i] == ';')
53 return i;
54 i++;
55 }
56
57 return -1;
58 }
59
60 int extract_param(
61 const char *in_buf,
62 const char *pattern,
63 unsigned int max_length,
64 char *out_buf,
65 unsigned char *type)
66 {
67 char *ptr;
68 int len;
69
70 if (!in_buf || !pattern || !out_buf || !type)
71 return -1;
72
73 ptr = strstr(in_buf, pattern);
74 if (!ptr)
75 return -1;
76
77 ptr = strstr(ptr, "=");
78 if (!ptr)
79 return -1;
80
81 ptr += 1;
82 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
83 ptr += 2; /* skip 0x */
84 *type = HEX;
85 } else
86 *type = DECIMAL;
87
88 len = strlen_semi(ptr);
89 if (len < 0)
90 return -1;
91
92 if (len >= max_length) {
93 pr_err("Length of input: %d exceeds max_length:"
94 " %d\n", len, max_length);
95 return -1;
96 }
97 memcpy(out_buf, ptr, len);
98 out_buf[len] = '\0';
99
100 return 0;
101 }
102
103 static u32 iscsi_handle_authentication(
104 struct iscsi_conn *conn,
105 char *in_buf,
106 char *out_buf,
107 int in_length,
108 int *out_length,
109 unsigned char *authtype)
110 {
111 struct iscsi_session *sess = conn->sess;
112 struct iscsi_node_auth *auth;
113 struct iscsi_node_acl *iscsi_nacl;
114 struct iscsi_portal_group *iscsi_tpg;
115 struct se_node_acl *se_nacl;
116
117 if (!sess->sess_ops->SessionType) {
118 /*
119 * For SessionType=Normal
120 */
121 se_nacl = conn->sess->se_sess->se_node_acl;
122 if (!se_nacl) {
123 pr_err("Unable to locate struct se_node_acl for"
124 " CHAP auth\n");
125 return -1;
126 }
127 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
128 se_node_acl);
129 if (!iscsi_nacl) {
130 pr_err("Unable to locate struct iscsi_node_acl for"
131 " CHAP auth\n");
132 return -1;
133 }
134
135 if (se_nacl->dynamic_node_acl) {
136 iscsi_tpg = container_of(se_nacl->se_tpg,
137 struct iscsi_portal_group, tpg_se_tpg);
138
139 auth = &iscsi_tpg->tpg_demo_auth;
140 } else {
141 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
142 se_node_acl);
143
144 auth = &iscsi_nacl->node_auth;
145 }
146 } else {
147 /*
148 * For SessionType=Discovery
149 */
150 auth = &iscsit_global->discovery_acl.node_auth;
151 }
152
153 if (strstr("CHAP", authtype))
154 strcpy(conn->sess->auth_type, "CHAP");
155 else
156 strcpy(conn->sess->auth_type, NONE);
157
158 if (strstr("None", authtype))
159 return 1;
160 #ifdef CANSRP
161 else if (strstr("SRP", authtype))
162 return srp_main_loop(conn, auth, in_buf, out_buf,
163 &in_length, out_length);
164 #endif
165 else if (strstr("CHAP", authtype))
166 return chap_main_loop(conn, auth, in_buf, out_buf,
167 &in_length, out_length);
168 else if (strstr("SPKM1", authtype))
169 return 2;
170 else if (strstr("SPKM2", authtype))
171 return 2;
172 else if (strstr("KRB5", authtype))
173 return 2;
174 else
175 return 2;
176 }
177
178 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
179 {
180 kfree(conn->auth_protocol);
181 }
182
183 int iscsi_target_check_login_request(
184 struct iscsi_conn *conn,
185 struct iscsi_login *login)
186 {
187 int req_csg, req_nsg;
188 u32 payload_length;
189 struct iscsi_login_req *login_req;
190
191 login_req = (struct iscsi_login_req *) login->req;
192 payload_length = ntoh24(login_req->dlength);
193
194 switch (login_req->opcode & ISCSI_OPCODE_MASK) {
195 case ISCSI_OP_LOGIN:
196 break;
197 default:
198 pr_err("Received unknown opcode 0x%02x.\n",
199 login_req->opcode & ISCSI_OPCODE_MASK);
200 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
201 ISCSI_LOGIN_STATUS_INIT_ERR);
202 return -1;
203 }
204
205 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
206 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
207 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
208 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
209 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
210 ISCSI_LOGIN_STATUS_INIT_ERR);
211 return -1;
212 }
213
214 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
215 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
216
217 if (req_csg != login->current_stage) {
218 pr_err("Initiator unexpectedly changed login stage"
219 " from %d to %d, login failed.\n", login->current_stage,
220 req_csg);
221 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
222 ISCSI_LOGIN_STATUS_INIT_ERR);
223 return -1;
224 }
225
226 if ((req_nsg == 2) || (req_csg >= 2) ||
227 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
228 (req_nsg <= req_csg))) {
229 pr_err("Illegal login_req->flags Combination, CSG: %d,"
230 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
231 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
232 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
233 ISCSI_LOGIN_STATUS_INIT_ERR);
234 return -1;
235 }
236
237 if ((login_req->max_version != login->version_max) ||
238 (login_req->min_version != login->version_min)) {
239 pr_err("Login request changed Version Max/Nin"
240 " unexpectedly to 0x%02x/0x%02x, protocol error\n",
241 login_req->max_version, login_req->min_version);
242 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
243 ISCSI_LOGIN_STATUS_INIT_ERR);
244 return -1;
245 }
246
247 if (memcmp(login_req->isid, login->isid, 6) != 0) {
248 pr_err("Login request changed ISID unexpectedly,"
249 " protocol error.\n");
250 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
251 ISCSI_LOGIN_STATUS_INIT_ERR);
252 return -1;
253 }
254
255 if (login_req->itt != login->init_task_tag) {
256 pr_err("Login request changed ITT unexpectedly to"
257 " 0x%08x, protocol error.\n", login_req->itt);
258 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
259 ISCSI_LOGIN_STATUS_INIT_ERR);
260 return -1;
261 }
262
263 if (payload_length > MAX_KEY_VALUE_PAIRS) {
264 pr_err("Login request payload exceeds default"
265 " MaxRecvDataSegmentLength: %u, protocol error.\n",
266 MAX_KEY_VALUE_PAIRS);
267 return -1;
268 }
269
270 return 0;
271 }
272
273 static int iscsi_target_check_first_request(
274 struct iscsi_conn *conn,
275 struct iscsi_login *login)
276 {
277 struct iscsi_param *param = NULL;
278 struct se_node_acl *se_nacl;
279
280 login->first_request = 0;
281
282 list_for_each_entry(param, &conn->param_list->param_list, p_list) {
283 if (!strncmp(param->name, SESSIONTYPE, 11)) {
284 if (!IS_PSTATE_ACCEPTOR(param)) {
285 pr_err("SessionType 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 if (!strncmp(param->value, DISCOVERY, 9))
292 return 0;
293 }
294
295 if (!strncmp(param->name, INITIATORNAME, 13)) {
296 if (!IS_PSTATE_ACCEPTOR(param)) {
297 if (!login->leading_connection)
298 continue;
299
300 pr_err("InitiatorName key not received"
301 " in first login request.\n");
302 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
303 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
304 return -1;
305 }
306
307 /*
308 * For non-leading connections, double check that the
309 * received InitiatorName matches the existing session's
310 * struct iscsi_node_acl.
311 */
312 if (!login->leading_connection) {
313 se_nacl = conn->sess->se_sess->se_node_acl;
314 if (!se_nacl) {
315 pr_err("Unable to locate"
316 " struct se_node_acl\n");
317 iscsit_tx_login_rsp(conn,
318 ISCSI_STATUS_CLS_INITIATOR_ERR,
319 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
320 return -1;
321 }
322
323 if (strcmp(param->value,
324 se_nacl->initiatorname)) {
325 pr_err("Incorrect"
326 " InitiatorName: %s for this"
327 " iSCSI Initiator Node.\n",
328 param->value);
329 iscsit_tx_login_rsp(conn,
330 ISCSI_STATUS_CLS_INITIATOR_ERR,
331 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
332 return -1;
333 }
334 }
335 }
336 }
337
338 return 0;
339 }
340
341 static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
342 {
343 u32 padding = 0;
344 struct iscsi_login_rsp *login_rsp;
345
346 login_rsp = (struct iscsi_login_rsp *) login->rsp;
347
348 login_rsp->opcode = ISCSI_OP_LOGIN_RSP;
349 hton24(login_rsp->dlength, login->rsp_length);
350 memcpy(login_rsp->isid, login->isid, 6);
351 login_rsp->tsih = cpu_to_be16(login->tsih);
352 login_rsp->itt = login->init_task_tag;
353 login_rsp->statsn = cpu_to_be32(conn->stat_sn++);
354 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
355 login_rsp->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
356
357 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
358 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
359 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
360 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
361 ntohl(login_rsp->statsn), login->rsp_length);
362
363 padding = ((-login->rsp_length) & 3);
364 /*
365 * Before sending the last login response containing the transition
366 * bit for full-feature-phase, go ahead and start up TX/RX threads
367 * now to avoid potential resource allocation failures after the
368 * final login response has been sent.
369 */
370 if (login->login_complete) {
371 int rc = iscsit_start_kthreads(conn);
372 if (rc) {
373 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
374 ISCSI_LOGIN_STATUS_NO_RESOURCES);
375 return -1;
376 }
377 }
378
379 if (conn->conn_transport->iscsit_put_login_tx(conn, login,
380 login->rsp_length + padding) < 0)
381 goto err;
382
383 login->rsp_length = 0;
384
385 return 0;
386
387 err:
388 if (login->login_complete) {
389 if (conn->rx_thread && conn->rx_thread_active) {
390 send_sig(SIGINT, conn->rx_thread, 1);
391 complete(&conn->rx_login_comp);
392 kthread_stop(conn->rx_thread);
393 }
394 if (conn->tx_thread && conn->tx_thread_active) {
395 send_sig(SIGINT, conn->tx_thread, 1);
396 kthread_stop(conn->tx_thread);
397 }
398 spin_lock(&iscsit_global->ts_bitmap_lock);
399 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
400 get_order(1));
401 spin_unlock(&iscsit_global->ts_bitmap_lock);
402 }
403 return -1;
404 }
405
406 static void iscsi_target_sk_data_ready(struct sock *sk)
407 {
408 struct iscsi_conn *conn = sk->sk_user_data;
409 bool rc;
410
411 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
412
413 write_lock_bh(&sk->sk_callback_lock);
414 if (!sk->sk_user_data) {
415 write_unlock_bh(&sk->sk_callback_lock);
416 return;
417 }
418 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
419 write_unlock_bh(&sk->sk_callback_lock);
420 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
421 return;
422 }
423 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
424 write_unlock_bh(&sk->sk_callback_lock);
425 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
426 return;
427 }
428 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
429 write_unlock_bh(&sk->sk_callback_lock);
430 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
431 return;
432 }
433
434 rc = schedule_delayed_work(&conn->login_work, 0);
435 if (!rc) {
436 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
437 " got false\n");
438 }
439 write_unlock_bh(&sk->sk_callback_lock);
440 }
441
442 static void iscsi_target_sk_state_change(struct sock *);
443
444 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
445 {
446 struct sock *sk;
447
448 if (!conn->sock)
449 return;
450
451 sk = conn->sock->sk;
452 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
453
454 write_lock_bh(&sk->sk_callback_lock);
455 sk->sk_user_data = conn;
456 conn->orig_data_ready = sk->sk_data_ready;
457 conn->orig_state_change = sk->sk_state_change;
458 sk->sk_data_ready = iscsi_target_sk_data_ready;
459 sk->sk_state_change = iscsi_target_sk_state_change;
460 write_unlock_bh(&sk->sk_callback_lock);
461
462 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
463 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
464 }
465
466 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
467 {
468 struct sock *sk;
469
470 if (!conn->sock)
471 return;
472
473 sk = conn->sock->sk;
474 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
475
476 write_lock_bh(&sk->sk_callback_lock);
477 if (!sk->sk_user_data) {
478 write_unlock_bh(&sk->sk_callback_lock);
479 return;
480 }
481 sk->sk_user_data = NULL;
482 sk->sk_data_ready = conn->orig_data_ready;
483 sk->sk_state_change = conn->orig_state_change;
484 write_unlock_bh(&sk->sk_callback_lock);
485
486 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
487 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
488 }
489
490 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
491
492 static bool iscsi_target_sk_state_check(struct sock *sk)
493 {
494 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
495 pr_debug("iscsi_target_sk_state_check: TCP_CLOSE_WAIT|TCP_CLOSE,"
496 "returning FALSE\n");
497 return false;
498 }
499 return true;
500 }
501
502 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
503 {
504 struct iscsi_np *np = login->np;
505 bool zero_tsih = login->zero_tsih;
506
507 iscsi_remove_failed_auth_entry(conn);
508 iscsi_target_nego_release(conn);
509 iscsi_target_login_sess_out(conn, np, zero_tsih, true);
510 }
511
512 static void iscsi_target_login_timeout(unsigned long data)
513 {
514 struct iscsi_conn *conn = (struct iscsi_conn *)data;
515
516 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
517
518 if (conn->login_kworker) {
519 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
520 conn->login_kworker->comm, conn->login_kworker->pid);
521 send_sig(SIGINT, conn->login_kworker, 1);
522 }
523 }
524
525 static void iscsi_target_do_login_rx(struct work_struct *work)
526 {
527 struct iscsi_conn *conn = container_of(work,
528 struct iscsi_conn, login_work.work);
529 struct iscsi_login *login = conn->login;
530 struct iscsi_np *np = login->np;
531 struct iscsi_portal_group *tpg = conn->tpg;
532 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
533 struct timer_list login_timer;
534 int rc, zero_tsih = login->zero_tsih;
535 bool state;
536
537 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
538 conn, current->comm, current->pid);
539
540 spin_lock(&tpg->tpg_state_lock);
541 state = (tpg->tpg_state == TPG_STATE_ACTIVE);
542 spin_unlock(&tpg->tpg_state_lock);
543
544 if (!state) {
545 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
546 iscsi_target_restore_sock_callbacks(conn);
547 iscsi_target_login_drop(conn, login);
548 iscsit_deaccess_np(np, tpg, tpg_np);
549 return;
550 }
551
552 if (conn->sock) {
553 struct sock *sk = conn->sock->sk;
554
555 read_lock_bh(&sk->sk_callback_lock);
556 state = iscsi_target_sk_state_check(sk);
557 read_unlock_bh(&sk->sk_callback_lock);
558
559 if (!state) {
560 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
561 iscsi_target_restore_sock_callbacks(conn);
562 iscsi_target_login_drop(conn, login);
563 iscsit_deaccess_np(np, tpg, tpg_np);
564 return;
565 }
566 }
567
568 conn->login_kworker = current;
569 allow_signal(SIGINT);
570
571 init_timer(&login_timer);
572 login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
573 login_timer.data = (unsigned long)conn;
574 login_timer.function = iscsi_target_login_timeout;
575 add_timer(&login_timer);
576 pr_debug("Starting login_timer for %s/%d\n", current->comm, current->pid);
577
578 rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
579 del_timer_sync(&login_timer);
580 flush_signals(current);
581 conn->login_kworker = NULL;
582
583 if (rc < 0) {
584 iscsi_target_restore_sock_callbacks(conn);
585 iscsi_target_login_drop(conn, login);
586 iscsit_deaccess_np(np, tpg, tpg_np);
587 return;
588 }
589
590 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
591 conn, current->comm, current->pid);
592
593 rc = iscsi_target_do_login(conn, login);
594 if (rc < 0) {
595 iscsi_target_restore_sock_callbacks(conn);
596 iscsi_target_login_drop(conn, login);
597 iscsit_deaccess_np(np, tpg, tpg_np);
598 } else if (!rc) {
599 if (conn->sock) {
600 struct sock *sk = conn->sock->sk;
601
602 write_lock_bh(&sk->sk_callback_lock);
603 clear_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags);
604 write_unlock_bh(&sk->sk_callback_lock);
605 }
606 } else if (rc == 1) {
607 iscsi_target_nego_release(conn);
608 iscsi_post_login_handler(np, conn, zero_tsih);
609 iscsit_deaccess_np(np, tpg, tpg_np);
610 }
611 }
612
613 static void iscsi_target_do_cleanup(struct work_struct *work)
614 {
615 struct iscsi_conn *conn = container_of(work,
616 struct iscsi_conn, login_cleanup_work.work);
617 struct sock *sk = conn->sock->sk;
618 struct iscsi_login *login = conn->login;
619 struct iscsi_np *np = login->np;
620 struct iscsi_portal_group *tpg = conn->tpg;
621 struct iscsi_tpg_np *tpg_np = conn->tpg_np;
622
623 pr_debug("Entering iscsi_target_do_cleanup\n");
624
625 cancel_delayed_work_sync(&conn->login_work);
626 conn->orig_state_change(sk);
627
628 iscsi_target_restore_sock_callbacks(conn);
629 iscsi_target_login_drop(conn, login);
630 iscsit_deaccess_np(np, tpg, tpg_np);
631
632 pr_debug("iscsi_target_do_cleanup done()\n");
633 }
634
635 static void iscsi_target_sk_state_change(struct sock *sk)
636 {
637 struct iscsi_conn *conn;
638 void (*orig_state_change)(struct sock *);
639 bool state;
640
641 pr_debug("Entering iscsi_target_sk_state_change\n");
642
643 write_lock_bh(&sk->sk_callback_lock);
644 conn = sk->sk_user_data;
645 if (!conn) {
646 write_unlock_bh(&sk->sk_callback_lock);
647 return;
648 }
649 orig_state_change = conn->orig_state_change;
650
651 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
652 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
653 conn);
654 write_unlock_bh(&sk->sk_callback_lock);
655 orig_state_change(sk);
656 return;
657 }
658 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
659 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
660 " conn: %p\n", conn);
661 write_unlock_bh(&sk->sk_callback_lock);
662 orig_state_change(sk);
663 return;
664 }
665 if (test_and_set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
666 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
667 conn);
668 write_unlock_bh(&sk->sk_callback_lock);
669 orig_state_change(sk);
670 return;
671 }
672
673 state = iscsi_target_sk_state_check(sk);
674 write_unlock_bh(&sk->sk_callback_lock);
675
676 pr_debug("iscsi_target_sk_state_change: state: %d\n", state);
677
678 if (!state) {
679 pr_debug("iscsi_target_sk_state_change got failed state\n");
680 schedule_delayed_work(&conn->login_cleanup_work, 0);
681 return;
682 }
683 orig_state_change(sk);
684 }
685
686 /*
687 * NOTE: We check for existing sessions or connections AFTER the initiator
688 * has been successfully authenticated in order to protect against faked
689 * ISID/TSIH combinations.
690 */
691 static int iscsi_target_check_for_existing_instances(
692 struct iscsi_conn *conn,
693 struct iscsi_login *login)
694 {
695 if (login->checked_for_existing)
696 return 0;
697
698 login->checked_for_existing = 1;
699
700 if (!login->tsih)
701 return iscsi_check_for_session_reinstatement(conn);
702 else
703 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
704 login->initial_exp_statsn);
705 }
706
707 static int iscsi_target_do_authentication(
708 struct iscsi_conn *conn,
709 struct iscsi_login *login)
710 {
711 int authret;
712 u32 payload_length;
713 struct iscsi_param *param;
714 struct iscsi_login_req *login_req;
715 struct iscsi_login_rsp *login_rsp;
716
717 login_req = (struct iscsi_login_req *) login->req;
718 login_rsp = (struct iscsi_login_rsp *) login->rsp;
719 payload_length = ntoh24(login_req->dlength);
720
721 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
722 if (!param)
723 return -1;
724
725 authret = iscsi_handle_authentication(
726 conn,
727 login->req_buf,
728 login->rsp_buf,
729 payload_length,
730 &login->rsp_length,
731 param->value);
732 switch (authret) {
733 case 0:
734 pr_debug("Received OK response"
735 " from LIO Authentication, continuing.\n");
736 break;
737 case 1:
738 pr_debug("iSCSI security negotiation"
739 " completed successfully.\n");
740 login->auth_complete = 1;
741 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
742 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
743 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
744 ISCSI_FLAG_LOGIN_TRANSIT);
745 login->current_stage = 1;
746 }
747 return iscsi_target_check_for_existing_instances(
748 conn, login);
749 case 2:
750 pr_err("Security negotiation"
751 " failed.\n");
752 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
753 ISCSI_LOGIN_STATUS_AUTH_FAILED);
754 return -1;
755 default:
756 pr_err("Received unknown error %d from LIO"
757 " Authentication\n", authret);
758 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
759 ISCSI_LOGIN_STATUS_TARGET_ERROR);
760 return -1;
761 }
762
763 return 0;
764 }
765
766 static int iscsi_target_handle_csg_zero(
767 struct iscsi_conn *conn,
768 struct iscsi_login *login)
769 {
770 int ret;
771 u32 payload_length;
772 struct iscsi_param *param;
773 struct iscsi_login_req *login_req;
774 struct iscsi_login_rsp *login_rsp;
775
776 login_req = (struct iscsi_login_req *) login->req;
777 login_rsp = (struct iscsi_login_rsp *) login->rsp;
778 payload_length = ntoh24(login_req->dlength);
779
780 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
781 if (!param)
782 return -1;
783
784 ret = iscsi_decode_text_input(
785 PHASE_SECURITY|PHASE_DECLARATIVE,
786 SENDER_INITIATOR|SENDER_RECEIVER,
787 login->req_buf,
788 payload_length,
789 conn);
790 if (ret < 0)
791 return -1;
792
793 if (ret > 0) {
794 if (login->auth_complete) {
795 pr_err("Initiator has already been"
796 " successfully authenticated, but is still"
797 " sending %s keys.\n", param->value);
798 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
799 ISCSI_LOGIN_STATUS_INIT_ERR);
800 return -1;
801 }
802
803 goto do_auth;
804 } else if (!payload_length) {
805 pr_err("Initiator sent zero length security payload,"
806 " login failed\n");
807 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
808 ISCSI_LOGIN_STATUS_AUTH_FAILED);
809 return -1;
810 }
811
812 if (login->first_request)
813 if (iscsi_target_check_first_request(conn, login) < 0)
814 return -1;
815
816 ret = iscsi_encode_text_output(
817 PHASE_SECURITY|PHASE_DECLARATIVE,
818 SENDER_TARGET,
819 login->rsp_buf,
820 &login->rsp_length,
821 conn->param_list,
822 conn->tpg->tpg_attrib.login_keys_workaround);
823 if (ret < 0)
824 return -1;
825
826 if (!iscsi_check_negotiated_keys(conn->param_list)) {
827 if (conn->tpg->tpg_attrib.authentication &&
828 !strncmp(param->value, NONE, 4)) {
829 pr_err("Initiator sent AuthMethod=None but"
830 " Target is enforcing iSCSI Authentication,"
831 " login failed.\n");
832 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
833 ISCSI_LOGIN_STATUS_AUTH_FAILED);
834 return -1;
835 }
836
837 if (conn->tpg->tpg_attrib.authentication &&
838 !login->auth_complete)
839 return 0;
840
841 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
842 return 0;
843
844 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
845 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
846 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
847 ISCSI_FLAG_LOGIN_TRANSIT;
848 login->current_stage = 1;
849 }
850 }
851
852 return 0;
853 do_auth:
854 return iscsi_target_do_authentication(conn, login);
855 }
856
857 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
858 {
859 int ret;
860 u32 payload_length;
861 struct iscsi_login_req *login_req;
862 struct iscsi_login_rsp *login_rsp;
863
864 login_req = (struct iscsi_login_req *) login->req;
865 login_rsp = (struct iscsi_login_rsp *) login->rsp;
866 payload_length = ntoh24(login_req->dlength);
867
868 ret = iscsi_decode_text_input(
869 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
870 SENDER_INITIATOR|SENDER_RECEIVER,
871 login->req_buf,
872 payload_length,
873 conn);
874 if (ret < 0) {
875 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
876 ISCSI_LOGIN_STATUS_INIT_ERR);
877 return -1;
878 }
879
880 if (login->first_request)
881 if (iscsi_target_check_first_request(conn, login) < 0)
882 return -1;
883
884 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
885 return -1;
886
887 ret = iscsi_encode_text_output(
888 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
889 SENDER_TARGET,
890 login->rsp_buf,
891 &login->rsp_length,
892 conn->param_list,
893 conn->tpg->tpg_attrib.login_keys_workaround);
894 if (ret < 0) {
895 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
896 ISCSI_LOGIN_STATUS_INIT_ERR);
897 return -1;
898 }
899
900 if (!login->auth_complete &&
901 conn->tpg->tpg_attrib.authentication) {
902 pr_err("Initiator is requesting CSG: 1, has not been"
903 " successfully authenticated, and the Target is"
904 " enforcing iSCSI Authentication, login failed.\n");
905 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
906 ISCSI_LOGIN_STATUS_AUTH_FAILED);
907 return -1;
908 }
909
910 if (!iscsi_check_negotiated_keys(conn->param_list))
911 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
912 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
913 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
914 ISCSI_FLAG_LOGIN_TRANSIT;
915
916 return 0;
917 }
918
919 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
920 {
921 int pdu_count = 0;
922 struct iscsi_login_req *login_req;
923 struct iscsi_login_rsp *login_rsp;
924
925 login_req = (struct iscsi_login_req *) login->req;
926 login_rsp = (struct iscsi_login_rsp *) login->rsp;
927
928 while (1) {
929 if (++pdu_count > MAX_LOGIN_PDUS) {
930 pr_err("MAX_LOGIN_PDUS count reached.\n");
931 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
932 ISCSI_LOGIN_STATUS_TARGET_ERROR);
933 return -1;
934 }
935
936 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
937 case 0:
938 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
939 if (iscsi_target_handle_csg_zero(conn, login) < 0)
940 return -1;
941 break;
942 case 1:
943 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
944 if (iscsi_target_handle_csg_one(conn, login) < 0)
945 return -1;
946 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
947 login->tsih = conn->sess->tsih;
948 login->login_complete = 1;
949 iscsi_target_restore_sock_callbacks(conn);
950 if (iscsi_target_do_tx_login_io(conn,
951 login) < 0)
952 return -1;
953 return 1;
954 }
955 break;
956 default:
957 pr_err("Illegal CSG: %d received from"
958 " Initiator, protocol error.\n",
959 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
960 break;
961 }
962
963 if (iscsi_target_do_tx_login_io(conn, login) < 0)
964 return -1;
965
966 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
967 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
968 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
969 }
970 break;
971 }
972
973 if (conn->sock) {
974 struct sock *sk = conn->sock->sk;
975 bool state;
976
977 read_lock_bh(&sk->sk_callback_lock);
978 state = iscsi_target_sk_state_check(sk);
979 read_unlock_bh(&sk->sk_callback_lock);
980
981 if (!state) {
982 pr_debug("iscsi_target_do_login() failed state for"
983 " conn: %p\n", conn);
984 return -1;
985 }
986 }
987
988 return 0;
989 }
990
991 static void iscsi_initiatorname_tolower(
992 char *param_buf)
993 {
994 char *c;
995 u32 iqn_size = strlen(param_buf), i;
996
997 for (i = 0; i < iqn_size; i++) {
998 c = &param_buf[i];
999 if (!isupper(*c))
1000 continue;
1001
1002 *c = tolower(*c);
1003 }
1004 }
1005
1006 /*
1007 * Processes the first Login Request..
1008 */
1009 int iscsi_target_locate_portal(
1010 struct iscsi_np *np,
1011 struct iscsi_conn *conn,
1012 struct iscsi_login *login)
1013 {
1014 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1015 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1016 struct iscsi_session *sess = conn->sess;
1017 struct iscsi_tiqn *tiqn;
1018 struct iscsi_tpg_np *tpg_np = NULL;
1019 struct iscsi_login_req *login_req;
1020 struct se_node_acl *se_nacl;
1021 u32 payload_length, queue_depth = 0;
1022 int sessiontype = 0, ret = 0, tag_num, tag_size;
1023
1024 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1025 INIT_DELAYED_WORK(&conn->login_cleanup_work, iscsi_target_do_cleanup);
1026 iscsi_target_set_sock_callbacks(conn);
1027
1028 login->np = np;
1029
1030 login_req = (struct iscsi_login_req *) login->req;
1031 payload_length = ntoh24(login_req->dlength);
1032
1033 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1034 if (!tmpbuf) {
1035 pr_err("Unable to allocate memory for tmpbuf.\n");
1036 return -1;
1037 }
1038
1039 memcpy(tmpbuf, login->req_buf, payload_length);
1040 tmpbuf[payload_length] = '\0';
1041 start = tmpbuf;
1042 end = (start + payload_length);
1043
1044 /*
1045 * Locate the initial keys expected from the Initiator node in
1046 * the first login request in order to progress with the login phase.
1047 */
1048 while (start < end) {
1049 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1050 ret = -1;
1051 goto out;
1052 }
1053
1054 if (!strncmp(key, "InitiatorName", 13))
1055 i_buf = value;
1056 else if (!strncmp(key, "SessionType", 11))
1057 s_buf = value;
1058 else if (!strncmp(key, "TargetName", 10))
1059 t_buf = value;
1060
1061 start += strlen(key) + strlen(value) + 2;
1062 }
1063 /*
1064 * See 5.3. Login Phase.
1065 */
1066 if (!i_buf) {
1067 pr_err("InitiatorName key not received"
1068 " in first login request.\n");
1069 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1070 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1071 ret = -1;
1072 goto out;
1073 }
1074 /*
1075 * Convert the incoming InitiatorName to lowercase following
1076 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1077 * are NOT case sensitive.
1078 */
1079 iscsi_initiatorname_tolower(i_buf);
1080
1081 if (!s_buf) {
1082 if (!login->leading_connection)
1083 goto get_target;
1084
1085 pr_err("SessionType key not received"
1086 " in first login request.\n");
1087 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1088 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1089 ret = -1;
1090 goto out;
1091 }
1092
1093 /*
1094 * Use default portal group for discovery sessions.
1095 */
1096 sessiontype = strncmp(s_buf, DISCOVERY, 9);
1097 if (!sessiontype) {
1098 conn->tpg = iscsit_global->discovery_tpg;
1099 if (!login->leading_connection)
1100 goto get_target;
1101
1102 sess->sess_ops->SessionType = 1;
1103 /*
1104 * Setup crc32c modules from libcrypto
1105 */
1106 if (iscsi_login_setup_crypto(conn) < 0) {
1107 pr_err("iscsi_login_setup_crypto() failed\n");
1108 ret = -1;
1109 goto out;
1110 }
1111 /*
1112 * Serialize access across the discovery struct iscsi_portal_group to
1113 * process login attempt.
1114 */
1115 if (iscsit_access_np(np, conn->tpg) < 0) {
1116 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1117 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1118 ret = -1;
1119 goto out;
1120 }
1121 ret = 0;
1122 goto alloc_tags;
1123 }
1124
1125 get_target:
1126 if (!t_buf) {
1127 pr_err("TargetName key not received"
1128 " in first login request while"
1129 " SessionType=Normal.\n");
1130 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1131 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1132 ret = -1;
1133 goto out;
1134 }
1135
1136 /*
1137 * Locate Target IQN from Storage Node.
1138 */
1139 tiqn = iscsit_get_tiqn_for_login(t_buf);
1140 if (!tiqn) {
1141 pr_err("Unable to locate Target IQN: %s in"
1142 " Storage Node\n", t_buf);
1143 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1144 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1145 ret = -1;
1146 goto out;
1147 }
1148 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1149
1150 /*
1151 * Locate Target Portal Group from Storage Node.
1152 */
1153 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1154 if (!conn->tpg) {
1155 pr_err("Unable to locate Target Portal Group"
1156 " on %s\n", tiqn->tiqn);
1157 iscsit_put_tiqn_for_login(tiqn);
1158 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1159 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1160 ret = -1;
1161 goto out;
1162 }
1163 conn->tpg_np = tpg_np;
1164 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1165 /*
1166 * Setup crc32c modules from libcrypto
1167 */
1168 if (iscsi_login_setup_crypto(conn) < 0) {
1169 pr_err("iscsi_login_setup_crypto() failed\n");
1170 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1171 iscsit_put_tiqn_for_login(tiqn);
1172 conn->tpg = NULL;
1173 ret = -1;
1174 goto out;
1175 }
1176 /*
1177 * Serialize access across the struct iscsi_portal_group to
1178 * process login attempt.
1179 */
1180 if (iscsit_access_np(np, conn->tpg) < 0) {
1181 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1182 iscsit_put_tiqn_for_login(tiqn);
1183 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1184 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1185 conn->tpg = NULL;
1186 ret = -1;
1187 goto out;
1188 }
1189
1190 /*
1191 * conn->sess->node_acl will be set when the referenced
1192 * struct iscsi_session is located from received ISID+TSIH in
1193 * iscsi_login_non_zero_tsih_s2().
1194 */
1195 if (!login->leading_connection) {
1196 ret = 0;
1197 goto out;
1198 }
1199
1200 /*
1201 * This value is required in iscsi_login_zero_tsih_s2()
1202 */
1203 sess->sess_ops->SessionType = 0;
1204
1205 /*
1206 * Locate incoming Initiator IQN reference from Storage Node.
1207 */
1208 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1209 &conn->tpg->tpg_se_tpg, i_buf);
1210 if (!sess->se_sess->se_node_acl) {
1211 pr_err("iSCSI Initiator Node: %s is not authorized to"
1212 " access iSCSI target portal group: %hu.\n",
1213 i_buf, conn->tpg->tpgt);
1214 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1215 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1216 ret = -1;
1217 goto out;
1218 }
1219 se_nacl = sess->se_sess->se_node_acl;
1220 queue_depth = se_nacl->queue_depth;
1221 /*
1222 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1223 * depth for non immediate commands, plus extra tags for immediate
1224 * commands.
1225 *
1226 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1227 * in per-cpu-ida tag allocation logic + small queue_depth.
1228 */
1229 alloc_tags:
1230 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1231 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1232 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1233
1234 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1235 if (ret < 0) {
1236 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1237 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1238 ret = -1;
1239 }
1240 out:
1241 kfree(tmpbuf);
1242 return ret;
1243 }
1244
1245 int iscsi_target_start_negotiation(
1246 struct iscsi_login *login,
1247 struct iscsi_conn *conn)
1248 {
1249 int ret;
1250
1251 ret = iscsi_target_do_login(conn, login);
1252 if (!ret) {
1253 if (conn->sock) {
1254 struct sock *sk = conn->sock->sk;
1255
1256 write_lock_bh(&sk->sk_callback_lock);
1257 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1258 write_unlock_bh(&sk->sk_callback_lock);
1259 }
1260 } else if (ret < 0) {
1261 cancel_delayed_work_sync(&conn->login_work);
1262 cancel_delayed_work_sync(&conn->login_cleanup_work);
1263 iscsi_target_restore_sock_callbacks(conn);
1264 iscsi_remove_failed_auth_entry(conn);
1265 }
1266 if (ret != 0)
1267 iscsi_target_nego_release(conn);
1268
1269 return ret;
1270 }
1271
1272 void iscsi_target_nego_release(struct iscsi_conn *conn)
1273 {
1274 struct iscsi_login *login = conn->conn_login;
1275
1276 if (!login)
1277 return;
1278
1279 kfree(login->req_buf);
1280 kfree(login->rsp_buf);
1281 kfree(login);
1282
1283 conn->conn_login = NULL;
1284 }