1/*******************************************************************************
2 * This file contains the login functions used by the iSCSI Target driver.
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/string.h>
20#include <linux/kthread.h>
21#include <linux/crypto.h>
22#include <linux/idr.h>
23#include <scsi/iscsi_proto.h>
24#include <target/target_core_base.h>
25#include <target/target_core_fabric.h>
26
27#include <target/iscsi/iscsi_target_core.h>
28#include <target/iscsi/iscsi_target_stat.h>
29#include "iscsi_target_device.h"
30#include "iscsi_target_nego.h"
31#include "iscsi_target_erl0.h"
32#include "iscsi_target_erl2.h"
33#include "iscsi_target_login.h"
34#include "iscsi_target_tpg.h"
35#include "iscsi_target_util.h"
36#include "iscsi_target.h"
37#include "iscsi_target_parameters.h"
38
39#include <target/iscsi/iscsi_transport.h>
40
41static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
42{
43	struct iscsi_login *login;
44
45	login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
46	if (!login) {
47		pr_err("Unable to allocate memory for struct iscsi_login.\n");
48		return NULL;
49	}
50	conn->login = login;
51	login->conn = conn;
52	login->first_request = 1;
53
54	login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
55	if (!login->req_buf) {
56		pr_err("Unable to allocate memory for response buffer.\n");
57		goto out_login;
58	}
59
60	login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
61	if (!login->rsp_buf) {
62		pr_err("Unable to allocate memory for request buffer.\n");
63		goto out_req_buf;
64	}
65
66	conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
67	if (!conn->conn_ops) {
68		pr_err("Unable to allocate memory for"
69			" struct iscsi_conn_ops.\n");
70		goto out_rsp_buf;
71	}
72
73	init_waitqueue_head(&conn->queues_wq);
74	INIT_LIST_HEAD(&conn->conn_list);
75	INIT_LIST_HEAD(&conn->conn_cmd_list);
76	INIT_LIST_HEAD(&conn->immed_queue_list);
77	INIT_LIST_HEAD(&conn->response_queue_list);
78	init_completion(&conn->conn_post_wait_comp);
79	init_completion(&conn->conn_wait_comp);
80	init_completion(&conn->conn_wait_rcfr_comp);
81	init_completion(&conn->conn_waiting_on_uc_comp);
82	init_completion(&conn->conn_logout_comp);
83	init_completion(&conn->rx_half_close_comp);
84	init_completion(&conn->tx_half_close_comp);
85	init_completion(&conn->rx_login_comp);
86	spin_lock_init(&conn->cmd_lock);
87	spin_lock_init(&conn->conn_usage_lock);
88	spin_lock_init(&conn->immed_queue_lock);
89	spin_lock_init(&conn->nopin_timer_lock);
90	spin_lock_init(&conn->response_queue_lock);
91	spin_lock_init(&conn->state_lock);
92
93	if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
94		pr_err("Unable to allocate conn->conn_cpumask\n");
95		goto out_conn_ops;
96	}
97	conn->conn_login = login;
98
99	return login;
100
101out_conn_ops:
102	kfree(conn->conn_ops);
103out_rsp_buf:
104	kfree(login->rsp_buf);
105out_req_buf:
106	kfree(login->req_buf);
107out_login:
108	kfree(login);
109	return NULL;
110}
111
112/*
113 * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
114 * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
115 */
116int iscsi_login_setup_crypto(struct iscsi_conn *conn)
117{
118	/*
119	 * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
120	 * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
121	 * to software 1x8 byte slicing from crc32c.ko
122	 */
123	conn->conn_rx_hash.flags = 0;
124	conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
125						CRYPTO_ALG_ASYNC);
126	if (IS_ERR(conn->conn_rx_hash.tfm)) {
127		pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
128		return -ENOMEM;
129	}
130
131	conn->conn_tx_hash.flags = 0;
132	conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
133						CRYPTO_ALG_ASYNC);
134	if (IS_ERR(conn->conn_tx_hash.tfm)) {
135		pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n");
136		crypto_free_hash(conn->conn_rx_hash.tfm);
137		return -ENOMEM;
138	}
139
140	return 0;
141}
142
143static int iscsi_login_check_initiator_version(
144	struct iscsi_conn *conn,
145	u8 version_max,
146	u8 version_min)
147{
148	if ((version_max != 0x00) || (version_min != 0x00)) {
149		pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
150			" version Min/Max 0x%02x/0x%02x, rejecting login.\n",
151			version_min, version_max);
152		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
153				ISCSI_LOGIN_STATUS_NO_VERSION);
154		return -1;
155	}
156
157	return 0;
158}
159
160int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
161{
162	int sessiontype;
163	struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
164	struct iscsi_portal_group *tpg = conn->tpg;
165	struct iscsi_session *sess = NULL, *sess_p = NULL;
166	struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
167	struct se_session *se_sess, *se_sess_tmp;
168
169	initiatorname_param = iscsi_find_param_from_key(
170			INITIATORNAME, conn->param_list);
171	sessiontype_param = iscsi_find_param_from_key(
172			SESSIONTYPE, conn->param_list);
173	if (!initiatorname_param || !sessiontype_param) {
174		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
175			ISCSI_LOGIN_STATUS_MISSING_FIELDS);
176		return -1;
177	}
178
179	sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
180
181	spin_lock_bh(&se_tpg->session_lock);
182	list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
183			sess_list) {
184
185		sess_p = se_sess->fabric_sess_ptr;
186		spin_lock(&sess_p->conn_lock);
187		if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
188		    atomic_read(&sess_p->session_logout) ||
189		    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
190			spin_unlock(&sess_p->conn_lock);
191			continue;
192		}
193		if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
194		   (!strcmp(sess_p->sess_ops->InitiatorName,
195			    initiatorname_param->value) &&
196		   (sess_p->sess_ops->SessionType == sessiontype))) {
197			atomic_set(&sess_p->session_reinstatement, 1);
198			spin_unlock(&sess_p->conn_lock);
199			iscsit_inc_session_usage_count(sess_p);
200			iscsit_stop_time2retain_timer(sess_p);
201			sess = sess_p;
202			break;
203		}
204		spin_unlock(&sess_p->conn_lock);
205	}
206	spin_unlock_bh(&se_tpg->session_lock);
207	/*
208	 * If the Time2Retain handler has expired, the session is already gone.
209	 */
210	if (!sess)
211		return 0;
212
213	pr_debug("%s iSCSI Session SID %u is still active for %s,"
214		" preforming session reinstatement.\n", (sessiontype) ?
215		"Discovery" : "Normal", sess->sid,
216		sess->sess_ops->InitiatorName);
217
218	spin_lock_bh(&sess->conn_lock);
219	if (sess->session_state == TARG_SESS_STATE_FAILED) {
220		spin_unlock_bh(&sess->conn_lock);
221		iscsit_dec_session_usage_count(sess);
222		target_put_session(sess->se_sess);
223		return 0;
224	}
225	spin_unlock_bh(&sess->conn_lock);
226
227	iscsit_stop_session(sess, 1, 1);
228	iscsit_dec_session_usage_count(sess);
229
230	target_put_session(sess->se_sess);
231	return 0;
232}
233
234static void iscsi_login_set_conn_values(
235	struct iscsi_session *sess,
236	struct iscsi_conn *conn,
237	__be16 cid)
238{
239	conn->sess		= sess;
240	conn->cid		= be16_to_cpu(cid);
241	/*
242	 * Generate a random Status sequence number (statsn) for the new
243	 * iSCSI connection.
244	 */
245	get_random_bytes(&conn->stat_sn, sizeof(u32));
246
247	mutex_lock(&auth_id_lock);
248	conn->auth_id		= iscsit_global->auth_id++;
249	mutex_unlock(&auth_id_lock);
250}
251
252static __printf(2, 3) int iscsi_change_param_sprintf(
253	struct iscsi_conn *conn,
254	const char *fmt, ...)
255{
256	va_list args;
257	unsigned char buf[64];
258
259	memset(buf, 0, sizeof buf);
260
261	va_start(args, fmt);
262	vsnprintf(buf, sizeof buf, fmt, args);
263	va_end(args);
264
265	if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
266		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
267				ISCSI_LOGIN_STATUS_NO_RESOURCES);
268		return -1;
269	}
270
271	return 0;
272}
273
274/*
275 *	This is the leading connection of a new session,
276 *	or session reinstatement.
277 */
278static int iscsi_login_zero_tsih_s1(
279	struct iscsi_conn *conn,
280	unsigned char *buf)
281{
282	struct iscsi_session *sess = NULL;
283	struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
284	int ret;
285
286	sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
287	if (!sess) {
288		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
289				ISCSI_LOGIN_STATUS_NO_RESOURCES);
290		pr_err("Could not allocate memory for session\n");
291		return -ENOMEM;
292	}
293
294	iscsi_login_set_conn_values(sess, conn, pdu->cid);
295	sess->init_task_tag	= pdu->itt;
296	memcpy(&sess->isid, pdu->isid, 6);
297	sess->exp_cmd_sn	= be32_to_cpu(pdu->cmdsn);
298	INIT_LIST_HEAD(&sess->sess_conn_list);
299	INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
300	INIT_LIST_HEAD(&sess->cr_active_list);
301	INIT_LIST_HEAD(&sess->cr_inactive_list);
302	init_completion(&sess->async_msg_comp);
303	init_completion(&sess->reinstatement_comp);
304	init_completion(&sess->session_wait_comp);
305	init_completion(&sess->session_waiting_on_uc_comp);
306	mutex_init(&sess->cmdsn_mutex);
307	spin_lock_init(&sess->conn_lock);
308	spin_lock_init(&sess->cr_a_lock);
309	spin_lock_init(&sess->cr_i_lock);
310	spin_lock_init(&sess->session_usage_lock);
311	spin_lock_init(&sess->ttt_lock);
312
313	idr_preload(GFP_KERNEL);
314	spin_lock_bh(&sess_idr_lock);
315	ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
316	if (ret >= 0)
317		sess->session_index = ret;
318	spin_unlock_bh(&sess_idr_lock);
319	idr_preload_end();
320
321	if (ret < 0) {
322		pr_err("idr_alloc() for sess_idr failed\n");
323		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
324				ISCSI_LOGIN_STATUS_NO_RESOURCES);
325		kfree(sess);
326		return -ENOMEM;
327	}
328
329	sess->creation_time = get_jiffies_64();
330	/*
331	 * The FFP CmdSN window values will be allocated from the TPG's
332	 * Initiator Node's ACL once the login has been successfully completed.
333	 */
334	sess->max_cmd_sn	= be32_to_cpu(pdu->cmdsn);
335
336	sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
337	if (!sess->sess_ops) {
338		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
339				ISCSI_LOGIN_STATUS_NO_RESOURCES);
340		pr_err("Unable to allocate memory for"
341				" struct iscsi_sess_ops.\n");
342		kfree(sess);
343		return -ENOMEM;
344	}
345
346	sess->se_sess = transport_init_session(TARGET_PROT_NORMAL);
347	if (IS_ERR(sess->se_sess)) {
348		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
349				ISCSI_LOGIN_STATUS_NO_RESOURCES);
350		kfree(sess->sess_ops);
351		kfree(sess);
352		return -ENOMEM;
353	}
354
355	return 0;
356}
357
358static int iscsi_login_zero_tsih_s2(
359	struct iscsi_conn *conn)
360{
361	struct iscsi_node_attrib *na;
362	struct iscsi_session *sess = conn->sess;
363	bool iser = false;
364
365	sess->tpg = conn->tpg;
366
367	/*
368	 * Assign a new TPG Session Handle.  Note this is protected with
369	 * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
370	 */
371	sess->tsih = ++sess->tpg->ntsih;
372	if (!sess->tsih)
373		sess->tsih = ++sess->tpg->ntsih;
374
375	/*
376	 * Create the default params from user defined values..
377	 */
378	if (iscsi_copy_param_list(&conn->param_list,
379				conn->tpg->param_list, 1) < 0) {
380		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
381				ISCSI_LOGIN_STATUS_NO_RESOURCES);
382		return -1;
383	}
384
385	if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
386		iser = true;
387
388	iscsi_set_keys_to_negotiate(conn->param_list, iser);
389
390	if (sess->sess_ops->SessionType)
391		return iscsi_set_keys_irrelevant_for_discovery(
392				conn->param_list);
393
394	na = iscsit_tpg_get_node_attrib(sess);
395
396	/*
397	 * Need to send TargetPortalGroupTag back in first login response
398	 * on any iSCSI connection where the Initiator provides TargetName.
399	 * See 5.3.1.  Login Phase Start
400	 *
401	 * In our case, we have already located the struct iscsi_tiqn at this point.
402	 */
403	if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
404		return -1;
405
406	/*
407	 * Workaround for Initiators that have broken connection recovery logic.
408	 *
409	 * "We would really like to get rid of this." Linux-iSCSI.org team
410	 */
411	if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
412		return -1;
413
414	if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
415		return -1;
416	/*
417	 * Set RDMAExtensions=Yes by default for iSER enabled network portals
418	 */
419	if (iser) {
420		struct iscsi_param *param;
421		unsigned long mrdsl, off;
422		int rc;
423
424		if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
425			return -1;
426
427		/*
428		 * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
429		 * Immediate Data + Unsolicitied Data-OUT if necessary..
430		 */
431		param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
432						  conn->param_list);
433		if (!param) {
434			iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
435				ISCSI_LOGIN_STATUS_NO_RESOURCES);
436			return -1;
437		}
438		rc = kstrtoul(param->value, 0, &mrdsl);
439		if (rc < 0) {
440			iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
441				ISCSI_LOGIN_STATUS_NO_RESOURCES);
442			return -1;
443		}
444		off = mrdsl % PAGE_SIZE;
445		if (!off)
446			goto check_prot;
447
448		if (mrdsl < PAGE_SIZE)
449			mrdsl = PAGE_SIZE;
450		else
451			mrdsl -= off;
452
453		pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
454			" to PAGE_SIZE\n", mrdsl);
455
456		if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
457			return -1;
458		/*
459		 * ISER currently requires that ImmediateData + Unsolicited
460		 * Data be disabled when protection / signature MRs are enabled.
461		 */
462check_prot:
463		if (sess->se_sess->sup_prot_ops &
464		   (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
465		    TARGET_PROT_DOUT_INSERT)) {
466
467			if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
468				return -1;
469
470			if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
471				return -1;
472
473			pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
474				 " T10-PI enabled ISER session\n");
475		}
476	}
477
478	return 0;
479}
480
481/*
482 * Remove PSTATE_NEGOTIATE for the four FIM related keys.
483 * The Initiator node will be able to enable FIM by proposing them itself.
484 */
485int iscsi_login_disable_FIM_keys(
486	struct iscsi_param_list *param_list,
487	struct iscsi_conn *conn)
488{
489	struct iscsi_param *param;
490
491	param = iscsi_find_param_from_key("OFMarker", param_list);
492	if (!param) {
493		pr_err("iscsi_find_param_from_key() for"
494				" OFMarker failed\n");
495		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
496				ISCSI_LOGIN_STATUS_NO_RESOURCES);
497		return -1;
498	}
499	param->state &= ~PSTATE_NEGOTIATE;
500
501	param = iscsi_find_param_from_key("OFMarkInt", param_list);
502	if (!param) {
503		pr_err("iscsi_find_param_from_key() for"
504				" IFMarker failed\n");
505		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
506				ISCSI_LOGIN_STATUS_NO_RESOURCES);
507		return -1;
508	}
509	param->state &= ~PSTATE_NEGOTIATE;
510
511	param = iscsi_find_param_from_key("IFMarker", param_list);
512	if (!param) {
513		pr_err("iscsi_find_param_from_key() for"
514				" IFMarker failed\n");
515		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
516				ISCSI_LOGIN_STATUS_NO_RESOURCES);
517		return -1;
518	}
519	param->state &= ~PSTATE_NEGOTIATE;
520
521	param = iscsi_find_param_from_key("IFMarkInt", param_list);
522	if (!param) {
523		pr_err("iscsi_find_param_from_key() for"
524				" IFMarker failed\n");
525		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
526				ISCSI_LOGIN_STATUS_NO_RESOURCES);
527		return -1;
528	}
529	param->state &= ~PSTATE_NEGOTIATE;
530
531	return 0;
532}
533
534static int iscsi_login_non_zero_tsih_s1(
535	struct iscsi_conn *conn,
536	unsigned char *buf)
537{
538	struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
539
540	iscsi_login_set_conn_values(NULL, conn, pdu->cid);
541	return 0;
542}
543
544/*
545 *	Add a new connection to an existing session.
546 */
547static int iscsi_login_non_zero_tsih_s2(
548	struct iscsi_conn *conn,
549	unsigned char *buf)
550{
551	struct iscsi_portal_group *tpg = conn->tpg;
552	struct iscsi_session *sess = NULL, *sess_p = NULL;
553	struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
554	struct se_session *se_sess, *se_sess_tmp;
555	struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
556	bool iser = false;
557
558	spin_lock_bh(&se_tpg->session_lock);
559	list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
560			sess_list) {
561
562		sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
563		if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
564		    atomic_read(&sess_p->session_logout) ||
565		   (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
566			continue;
567		if (!memcmp(sess_p->isid, pdu->isid, 6) &&
568		     (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
569			iscsit_inc_session_usage_count(sess_p);
570			iscsit_stop_time2retain_timer(sess_p);
571			sess = sess_p;
572			break;
573		}
574	}
575	spin_unlock_bh(&se_tpg->session_lock);
576
577	/*
578	 * If the Time2Retain handler has expired, the session is already gone.
579	 */
580	if (!sess) {
581		pr_err("Initiator attempting to add a connection to"
582			" a non-existent session, rejecting iSCSI Login.\n");
583		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
584				ISCSI_LOGIN_STATUS_NO_SESSION);
585		return -1;
586	}
587
588	/*
589	 * Stop the Time2Retain timer if this is a failed session, we restart
590	 * the timer if the login is not successful.
591	 */
592	spin_lock_bh(&sess->conn_lock);
593	if (sess->session_state == TARG_SESS_STATE_FAILED)
594		atomic_set(&sess->session_continuation, 1);
595	spin_unlock_bh(&sess->conn_lock);
596
597	iscsi_login_set_conn_values(sess, conn, pdu->cid);
598
599	if (iscsi_copy_param_list(&conn->param_list,
600			conn->tpg->param_list, 0) < 0) {
601		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
602				ISCSI_LOGIN_STATUS_NO_RESOURCES);
603		return -1;
604	}
605
606	if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
607		iser = true;
608
609	iscsi_set_keys_to_negotiate(conn->param_list, iser);
610	/*
611	 * Need to send TargetPortalGroupTag back in first login response
612	 * on any iSCSI connection where the Initiator provides TargetName.
613	 * See 5.3.1.  Login Phase Start
614	 *
615	 * In our case, we have already located the struct iscsi_tiqn at this point.
616	 */
617	if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
618		return -1;
619
620	return iscsi_login_disable_FIM_keys(conn->param_list, conn);
621}
622
623int iscsi_login_post_auth_non_zero_tsih(
624	struct iscsi_conn *conn,
625	u16 cid,
626	u32 exp_statsn)
627{
628	struct iscsi_conn *conn_ptr = NULL;
629	struct iscsi_conn_recovery *cr = NULL;
630	struct iscsi_session *sess = conn->sess;
631
632	/*
633	 * By following item 5 in the login table,  if we have found
634	 * an existing ISID and a valid/existing TSIH and an existing
635	 * CID we do connection reinstatement.  Currently we dont not
636	 * support it so we send back an non-zero status class to the
637	 * initiator and release the new connection.
638	 */
639	conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
640	if (conn_ptr) {
641		pr_err("Connection exists with CID %hu for %s,"
642			" performing connection reinstatement.\n",
643			conn_ptr->cid, sess->sess_ops->InitiatorName);
644
645		iscsit_connection_reinstatement_rcfr(conn_ptr);
646		iscsit_dec_conn_usage_count(conn_ptr);
647	}
648
649	/*
650	 * Check for any connection recovery entires containing CID.
651	 * We use the original ExpStatSN sent in the first login request
652	 * to acknowledge commands for the failed connection.
653	 *
654	 * Also note that an explict logout may have already been sent,
655	 * but the response may not be sent due to additional connection
656	 * loss.
657	 */
658	if (sess->sess_ops->ErrorRecoveryLevel == 2) {
659		cr = iscsit_get_inactive_connection_recovery_entry(
660				sess, cid);
661		if (cr) {
662			pr_debug("Performing implicit logout"
663				" for connection recovery on CID: %hu\n",
664					conn->cid);
665			iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
666		}
667	}
668
669	/*
670	 * Else we follow item 4 from the login table in that we have
671	 * found an existing ISID and a valid/existing TSIH and a new
672	 * CID we go ahead and continue to add a new connection to the
673	 * session.
674	 */
675	pr_debug("Adding CID %hu to existing session for %s.\n",
676			cid, sess->sess_ops->InitiatorName);
677
678	if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
679		pr_err("Adding additional connection to this session"
680			" would exceed MaxConnections %d, login failed.\n",
681				sess->sess_ops->MaxConnections);
682		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
683				ISCSI_LOGIN_STATUS_ISID_ERROR);
684		return -1;
685	}
686
687	return 0;
688}
689
690static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
691{
692	struct iscsi_session *sess = conn->sess;
693	/*
694	 * FIXME: Unsolicitied NopIN support for ISER
695	 */
696	if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
697		return;
698
699	if (!sess->sess_ops->SessionType)
700		iscsit_start_nopin_timer(conn);
701}
702
703int iscsit_start_kthreads(struct iscsi_conn *conn)
704{
705	int ret = 0;
706
707	spin_lock(&iscsit_global->ts_bitmap_lock);
708	conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
709					ISCSIT_BITMAP_BITS, get_order(1));
710	spin_unlock(&iscsit_global->ts_bitmap_lock);
711
712	if (conn->bitmap_id < 0) {
713		pr_err("bitmap_find_free_region() failed for"
714		       " iscsit_start_kthreads()\n");
715		return -ENOMEM;
716	}
717
718	conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
719				      "%s", ISCSI_TX_THREAD_NAME);
720	if (IS_ERR(conn->tx_thread)) {
721		pr_err("Unable to start iscsi_target_tx_thread\n");
722		ret = PTR_ERR(conn->tx_thread);
723		goto out_bitmap;
724	}
725	conn->tx_thread_active = true;
726
727	conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
728				      "%s", ISCSI_RX_THREAD_NAME);
729	if (IS_ERR(conn->rx_thread)) {
730		pr_err("Unable to start iscsi_target_rx_thread\n");
731		ret = PTR_ERR(conn->rx_thread);
732		goto out_tx;
733	}
734	conn->rx_thread_active = true;
735
736	return 0;
737out_tx:
738	send_sig(SIGINT, conn->tx_thread, 1);
739	kthread_stop(conn->tx_thread);
740	conn->tx_thread_active = false;
741out_bitmap:
742	spin_lock(&iscsit_global->ts_bitmap_lock);
743	bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
744			      get_order(1));
745	spin_unlock(&iscsit_global->ts_bitmap_lock);
746	return ret;
747}
748
749void iscsi_post_login_handler(
750	struct iscsi_np *np,
751	struct iscsi_conn *conn,
752	u8 zero_tsih)
753{
754	int stop_timer = 0;
755	struct iscsi_session *sess = conn->sess;
756	struct se_session *se_sess = sess->se_sess;
757	struct iscsi_portal_group *tpg = sess->tpg;
758	struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
759
760	iscsit_inc_conn_usage_count(conn);
761
762	iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
763			ISCSI_LOGIN_STATUS_ACCEPT);
764
765	pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
766	conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
767
768	iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
769	iscsit_set_sync_and_steering_values(conn);
770	/*
771	 * SCSI Initiator -> SCSI Target Port Mapping
772	 */
773	if (!zero_tsih) {
774		iscsi_set_session_parameters(sess->sess_ops,
775				conn->param_list, 0);
776		iscsi_release_param_list(conn->param_list);
777		conn->param_list = NULL;
778
779		spin_lock_bh(&sess->conn_lock);
780		atomic_set(&sess->session_continuation, 0);
781		if (sess->session_state == TARG_SESS_STATE_FAILED) {
782			pr_debug("Moving to"
783					" TARG_SESS_STATE_LOGGED_IN.\n");
784			sess->session_state = TARG_SESS_STATE_LOGGED_IN;
785			stop_timer = 1;
786		}
787
788		pr_debug("iSCSI Login successful on CID: %hu from %s to"
789			" %s:%hu,%hu\n", conn->cid, conn->login_ip,
790			conn->local_ip, conn->local_port, tpg->tpgt);
791
792		list_add_tail(&conn->conn_list, &sess->sess_conn_list);
793		atomic_inc(&sess->nconn);
794		pr_debug("Incremented iSCSI Connection count to %hu"
795			" from node: %s\n", atomic_read(&sess->nconn),
796			sess->sess_ops->InitiatorName);
797		spin_unlock_bh(&sess->conn_lock);
798
799		iscsi_post_login_start_timers(conn);
800		/*
801		 * Determine CPU mask to ensure connection's RX and TX kthreads
802		 * are scheduled on the same CPU.
803		 */
804		iscsit_thread_get_cpumask(conn);
805		conn->conn_rx_reset_cpumask = 1;
806		conn->conn_tx_reset_cpumask = 1;
807		/*
808		 * Wakeup the sleeping iscsi_target_rx_thread() now that
809		 * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
810		 */
811		complete(&conn->rx_login_comp);
812		iscsit_dec_conn_usage_count(conn);
813
814		if (stop_timer) {
815			spin_lock_bh(&se_tpg->session_lock);
816			iscsit_stop_time2retain_timer(sess);
817			spin_unlock_bh(&se_tpg->session_lock);
818		}
819		iscsit_dec_session_usage_count(sess);
820		return;
821	}
822
823	iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
824	iscsi_release_param_list(conn->param_list);
825	conn->param_list = NULL;
826
827	iscsit_determine_maxcmdsn(sess);
828
829	spin_lock_bh(&se_tpg->session_lock);
830	__transport_register_session(&sess->tpg->tpg_se_tpg,
831			se_sess->se_node_acl, se_sess, sess);
832	pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
833	sess->session_state = TARG_SESS_STATE_LOGGED_IN;
834
835	pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
836		conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
837		tpg->tpgt);
838
839	spin_lock_bh(&sess->conn_lock);
840	list_add_tail(&conn->conn_list, &sess->sess_conn_list);
841	atomic_inc(&sess->nconn);
842	pr_debug("Incremented iSCSI Connection count to %hu from node:"
843		" %s\n", atomic_read(&sess->nconn),
844		sess->sess_ops->InitiatorName);
845	spin_unlock_bh(&sess->conn_lock);
846
847	sess->sid = tpg->sid++;
848	if (!sess->sid)
849		sess->sid = tpg->sid++;
850	pr_debug("Established iSCSI session from node: %s\n",
851			sess->sess_ops->InitiatorName);
852
853	tpg->nsessions++;
854	if (tpg->tpg_tiqn)
855		tpg->tpg_tiqn->tiqn_nsessions++;
856
857	pr_debug("Incremented number of active iSCSI sessions to %u on"
858		" iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
859	spin_unlock_bh(&se_tpg->session_lock);
860
861	iscsi_post_login_start_timers(conn);
862	/*
863	 * Determine CPU mask to ensure connection's RX and TX kthreads
864	 * are scheduled on the same CPU.
865	 */
866	iscsit_thread_get_cpumask(conn);
867	conn->conn_rx_reset_cpumask = 1;
868	conn->conn_tx_reset_cpumask = 1;
869	/*
870	 * Wakeup the sleeping iscsi_target_rx_thread() now that
871	 * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
872	 */
873	complete(&conn->rx_login_comp);
874	iscsit_dec_conn_usage_count(conn);
875}
876
877static void iscsi_handle_login_thread_timeout(unsigned long data)
878{
879	struct iscsi_np *np = (struct iscsi_np *) data;
880
881	spin_lock_bh(&np->np_thread_lock);
882	pr_err("iSCSI Login timeout on Network Portal %pISc:%hu\n",
883			&np->np_sockaddr, np->np_port);
884
885	if (np->np_login_timer_flags & ISCSI_TF_STOP) {
886		spin_unlock_bh(&np->np_thread_lock);
887		return;
888	}
889
890	if (np->np_thread)
891		send_sig(SIGINT, np->np_thread, 1);
892
893	np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
894	spin_unlock_bh(&np->np_thread_lock);
895}
896
897static void iscsi_start_login_thread_timer(struct iscsi_np *np)
898{
899	/*
900	 * This used the TA_LOGIN_TIMEOUT constant because at this
901	 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
902	 */
903	spin_lock_bh(&np->np_thread_lock);
904	init_timer(&np->np_login_timer);
905	np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
906	np->np_login_timer.data = (unsigned long)np;
907	np->np_login_timer.function = iscsi_handle_login_thread_timeout;
908	np->np_login_timer_flags &= ~ISCSI_TF_STOP;
909	np->np_login_timer_flags |= ISCSI_TF_RUNNING;
910	add_timer(&np->np_login_timer);
911
912	pr_debug("Added timeout timer to iSCSI login request for"
913			" %u seconds.\n", TA_LOGIN_TIMEOUT);
914	spin_unlock_bh(&np->np_thread_lock);
915}
916
917static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
918{
919	spin_lock_bh(&np->np_thread_lock);
920	if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
921		spin_unlock_bh(&np->np_thread_lock);
922		return;
923	}
924	np->np_login_timer_flags |= ISCSI_TF_STOP;
925	spin_unlock_bh(&np->np_thread_lock);
926
927	del_timer_sync(&np->np_login_timer);
928
929	spin_lock_bh(&np->np_thread_lock);
930	np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
931	spin_unlock_bh(&np->np_thread_lock);
932}
933
934int iscsit_setup_np(
935	struct iscsi_np *np,
936	struct __kernel_sockaddr_storage *sockaddr)
937{
938	struct socket *sock = NULL;
939	int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
940
941	switch (np->np_network_transport) {
942	case ISCSI_TCP:
943		np->np_ip_proto = IPPROTO_TCP;
944		np->np_sock_type = SOCK_STREAM;
945		break;
946	case ISCSI_SCTP_TCP:
947		np->np_ip_proto = IPPROTO_SCTP;
948		np->np_sock_type = SOCK_STREAM;
949		break;
950	case ISCSI_SCTP_UDP:
951		np->np_ip_proto = IPPROTO_SCTP;
952		np->np_sock_type = SOCK_SEQPACKET;
953		break;
954	default:
955		pr_err("Unsupported network_transport: %d\n",
956				np->np_network_transport);
957		return -EINVAL;
958	}
959
960	np->np_ip_proto = IPPROTO_TCP;
961	np->np_sock_type = SOCK_STREAM;
962
963	ret = sock_create(sockaddr->ss_family, np->np_sock_type,
964			np->np_ip_proto, &sock);
965	if (ret < 0) {
966		pr_err("sock_create() failed.\n");
967		return ret;
968	}
969	np->np_socket = sock;
970	/*
971	 * Setup the np->np_sockaddr from the passed sockaddr setup
972	 * in iscsi_target_configfs.c code..
973	 */
974	memcpy(&np->np_sockaddr, sockaddr,
975			sizeof(struct __kernel_sockaddr_storage));
976
977	if (sockaddr->ss_family == AF_INET6)
978		len = sizeof(struct sockaddr_in6);
979	else
980		len = sizeof(struct sockaddr_in);
981	/*
982	 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
983	 */
984	/* FIXME: Someone please explain why this is endian-safe */
985	opt = 1;
986	if (np->np_network_transport == ISCSI_TCP) {
987		ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
988				(char *)&opt, sizeof(opt));
989		if (ret < 0) {
990			pr_err("kernel_setsockopt() for TCP_NODELAY"
991				" failed: %d\n", ret);
992			goto fail;
993		}
994	}
995
996	/* FIXME: Someone please explain why this is endian-safe */
997	ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
998			(char *)&opt, sizeof(opt));
999	if (ret < 0) {
1000		pr_err("kernel_setsockopt() for SO_REUSEADDR"
1001			" failed\n");
1002		goto fail;
1003	}
1004
1005	ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
1006			(char *)&opt, sizeof(opt));
1007	if (ret < 0) {
1008		pr_err("kernel_setsockopt() for IP_FREEBIND"
1009			" failed\n");
1010		goto fail;
1011	}
1012
1013	ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
1014	if (ret < 0) {
1015		pr_err("kernel_bind() failed: %d\n", ret);
1016		goto fail;
1017	}
1018
1019	ret = kernel_listen(sock, backlog);
1020	if (ret != 0) {
1021		pr_err("kernel_listen() failed: %d\n", ret);
1022		goto fail;
1023	}
1024
1025	return 0;
1026fail:
1027	np->np_socket = NULL;
1028	sock_release(sock);
1029	return ret;
1030}
1031
1032int iscsi_target_setup_login_socket(
1033	struct iscsi_np *np,
1034	struct __kernel_sockaddr_storage *sockaddr)
1035{
1036	struct iscsit_transport *t;
1037	int rc;
1038
1039	t = iscsit_get_transport(np->np_network_transport);
1040	if (!t)
1041		return -EINVAL;
1042
1043	rc = t->iscsit_setup_np(np, sockaddr);
1044	if (rc < 0) {
1045		iscsit_put_transport(t);
1046		return rc;
1047	}
1048
1049	np->np_transport = t;
1050	np->enabled = true;
1051	return 0;
1052}
1053
1054int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1055{
1056	struct socket *new_sock, *sock = np->np_socket;
1057	struct sockaddr_in sock_in;
1058	struct sockaddr_in6 sock_in6;
1059	int rc, err;
1060
1061	rc = kernel_accept(sock, &new_sock, 0);
1062	if (rc < 0)
1063		return rc;
1064
1065	conn->sock = new_sock;
1066	conn->login_family = np->np_sockaddr.ss_family;
1067
1068	if (np->np_sockaddr.ss_family == AF_INET6) {
1069		memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1070
1071		rc = conn->sock->ops->getname(conn->sock,
1072				(struct sockaddr *)&sock_in6, &err, 1);
1073		if (!rc) {
1074			if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1075				snprintf(conn->login_ip, sizeof(conn->login_ip), "[%pI6c]",
1076					&sock_in6.sin6_addr.in6_u);
1077			else
1078				snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI4",
1079					&sock_in6.sin6_addr.s6_addr32[3]);
1080			conn->login_port = ntohs(sock_in6.sin6_port);
1081		}
1082
1083		rc = conn->sock->ops->getname(conn->sock,
1084				(struct sockaddr *)&sock_in6, &err, 0);
1085		if (!rc) {
1086			if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1087				snprintf(conn->local_ip, sizeof(conn->local_ip), "[%pI6c]",
1088					&sock_in6.sin6_addr.in6_u);
1089			else
1090				snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI4",
1091					&sock_in6.sin6_addr.s6_addr32[3]);
1092			conn->local_port = ntohs(sock_in6.sin6_port);
1093		}
1094	} else {
1095		memset(&sock_in, 0, sizeof(struct sockaddr_in));
1096
1097		rc = conn->sock->ops->getname(conn->sock,
1098				(struct sockaddr *)&sock_in, &err, 1);
1099		if (!rc) {
1100			sprintf(conn->login_ip, "%pI4",
1101					&sock_in.sin_addr.s_addr);
1102			conn->login_port = ntohs(sock_in.sin_port);
1103		}
1104
1105		rc = conn->sock->ops->getname(conn->sock,
1106				(struct sockaddr *)&sock_in, &err, 0);
1107		if (!rc) {
1108			sprintf(conn->local_ip, "%pI4",
1109					&sock_in.sin_addr.s_addr);
1110			conn->local_port = ntohs(sock_in.sin_port);
1111		}
1112	}
1113
1114	return 0;
1115}
1116
1117int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1118{
1119	struct iscsi_login_req *login_req;
1120	u32 padding = 0, payload_length;
1121
1122	if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1123		return -1;
1124
1125	login_req = (struct iscsi_login_req *)login->req;
1126	payload_length	= ntoh24(login_req->dlength);
1127	padding = ((-payload_length) & 3);
1128
1129	pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1130		" CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1131		login_req->flags, login_req->itt, login_req->cmdsn,
1132		login_req->exp_statsn, login_req->cid, payload_length);
1133	/*
1134	 * Setup the initial iscsi_login values from the leading
1135	 * login request PDU.
1136	 */
1137	if (login->first_request) {
1138		login_req = (struct iscsi_login_req *)login->req;
1139		login->leading_connection = (!login_req->tsih) ? 1 : 0;
1140		login->current_stage	= ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1141		login->version_min	= login_req->min_version;
1142		login->version_max	= login_req->max_version;
1143		memcpy(login->isid, login_req->isid, 6);
1144		login->cmd_sn		= be32_to_cpu(login_req->cmdsn);
1145		login->init_task_tag	= login_req->itt;
1146		login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1147		login->cid		= be16_to_cpu(login_req->cid);
1148		login->tsih		= be16_to_cpu(login_req->tsih);
1149	}
1150
1151	if (iscsi_target_check_login_request(conn, login) < 0)
1152		return -1;
1153
1154	memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1155	if (iscsi_login_rx_data(conn, login->req_buf,
1156				payload_length + padding) < 0)
1157		return -1;
1158
1159	return 0;
1160}
1161
1162int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1163			u32 length)
1164{
1165	if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1166		return -1;
1167
1168	return 0;
1169}
1170
1171static int
1172iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1173{
1174	int rc;
1175
1176	if (!t->owner) {
1177		conn->conn_transport = t;
1178		return 0;
1179	}
1180
1181	rc = try_module_get(t->owner);
1182	if (!rc) {
1183		pr_err("try_module_get() failed for %s\n", t->name);
1184		return -EINVAL;
1185	}
1186
1187	conn->conn_transport = t;
1188	return 0;
1189}
1190
1191void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1192		struct iscsi_np *np, bool zero_tsih, bool new_sess)
1193{
1194	if (!new_sess)
1195		goto old_sess_out;
1196
1197	pr_err("iSCSI Login negotiation failed.\n");
1198	iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1199				   ISCSI_LOGIN_STATUS_INIT_ERR);
1200	if (!zero_tsih || !conn->sess)
1201		goto old_sess_out;
1202	if (conn->sess->se_sess)
1203		transport_free_session(conn->sess->se_sess);
1204	if (conn->sess->session_index != 0) {
1205		spin_lock_bh(&sess_idr_lock);
1206		idr_remove(&sess_idr, conn->sess->session_index);
1207		spin_unlock_bh(&sess_idr_lock);
1208	}
1209	kfree(conn->sess->sess_ops);
1210	kfree(conn->sess);
1211	conn->sess = NULL;
1212
1213old_sess_out:
1214	iscsi_stop_login_thread_timer(np);
1215	/*
1216	 * If login negotiation fails check if the Time2Retain timer
1217	 * needs to be restarted.
1218	 */
1219	if (!zero_tsih && conn->sess) {
1220		spin_lock_bh(&conn->sess->conn_lock);
1221		if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1222			struct se_portal_group *se_tpg =
1223					&conn->tpg->tpg_se_tpg;
1224
1225			atomic_set(&conn->sess->session_continuation, 0);
1226			spin_unlock_bh(&conn->sess->conn_lock);
1227			spin_lock_bh(&se_tpg->session_lock);
1228			iscsit_start_time2retain_handler(conn->sess);
1229			spin_unlock_bh(&se_tpg->session_lock);
1230		} else
1231			spin_unlock_bh(&conn->sess->conn_lock);
1232		iscsit_dec_session_usage_count(conn->sess);
1233	}
1234
1235	if (!IS_ERR(conn->conn_rx_hash.tfm))
1236		crypto_free_hash(conn->conn_rx_hash.tfm);
1237	if (!IS_ERR(conn->conn_tx_hash.tfm))
1238		crypto_free_hash(conn->conn_tx_hash.tfm);
1239
1240	free_cpumask_var(conn->conn_cpumask);
1241
1242	kfree(conn->conn_ops);
1243
1244	if (conn->param_list) {
1245		iscsi_release_param_list(conn->param_list);
1246		conn->param_list = NULL;
1247	}
1248	iscsi_target_nego_release(conn);
1249
1250	if (conn->sock) {
1251		sock_release(conn->sock);
1252		conn->sock = NULL;
1253	}
1254
1255	if (conn->conn_transport->iscsit_wait_conn)
1256		conn->conn_transport->iscsit_wait_conn(conn);
1257
1258	if (conn->conn_transport->iscsit_free_conn)
1259		conn->conn_transport->iscsit_free_conn(conn);
1260
1261	iscsit_put_transport(conn->conn_transport);
1262	kfree(conn);
1263}
1264
1265static int __iscsi_target_login_thread(struct iscsi_np *np)
1266{
1267	u8 *buffer, zero_tsih = 0;
1268	int ret = 0, rc;
1269	struct iscsi_conn *conn = NULL;
1270	struct iscsi_login *login;
1271	struct iscsi_portal_group *tpg = NULL;
1272	struct iscsi_login_req *pdu;
1273	struct iscsi_tpg_np *tpg_np;
1274	bool new_sess = false;
1275
1276	flush_signals(current);
1277
1278	spin_lock_bh(&np->np_thread_lock);
1279	if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1280		np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1281		complete(&np->np_restart_comp);
1282	} else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1283		spin_unlock_bh(&np->np_thread_lock);
1284		goto exit;
1285	} else {
1286		np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1287	}
1288	spin_unlock_bh(&np->np_thread_lock);
1289
1290	conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1291	if (!conn) {
1292		pr_err("Could not allocate memory for"
1293			" new connection\n");
1294		/* Get another socket */
1295		return 1;
1296	}
1297	pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1298	conn->conn_state = TARG_CONN_STATE_FREE;
1299
1300	if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1301		kfree(conn);
1302		return 1;
1303	}
1304
1305	rc = np->np_transport->iscsit_accept_np(np, conn);
1306	if (rc == -ENOSYS) {
1307		complete(&np->np_restart_comp);
1308		iscsit_put_transport(conn->conn_transport);
1309		kfree(conn);
1310		conn = NULL;
1311		goto exit;
1312	} else if (rc < 0) {
1313		spin_lock_bh(&np->np_thread_lock);
1314		if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1315			spin_unlock_bh(&np->np_thread_lock);
1316			complete(&np->np_restart_comp);
1317			iscsit_put_transport(conn->conn_transport);
1318			kfree(conn);
1319			conn = NULL;
1320			/* Get another socket */
1321			return 1;
1322		}
1323		spin_unlock_bh(&np->np_thread_lock);
1324		iscsit_put_transport(conn->conn_transport);
1325		kfree(conn);
1326		conn = NULL;
1327		goto out;
1328	}
1329	/*
1330	 * Perform the remaining iSCSI connection initialization items..
1331	 */
1332	login = iscsi_login_init_conn(conn);
1333	if (!login) {
1334		goto new_sess_out;
1335	}
1336
1337	iscsi_start_login_thread_timer(np);
1338
1339	pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1340	conn->conn_state = TARG_CONN_STATE_XPT_UP;
1341	/*
1342	 * This will process the first login request + payload..
1343	 */
1344	rc = np->np_transport->iscsit_get_login_rx(conn, login);
1345	if (rc == 1)
1346		return 1;
1347	else if (rc < 0)
1348		goto new_sess_out;
1349
1350	buffer = &login->req[0];
1351	pdu = (struct iscsi_login_req *)buffer;
1352	/*
1353	 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1354	 * when Status-Class != 0.
1355	*/
1356	conn->login_itt	= pdu->itt;
1357
1358	spin_lock_bh(&np->np_thread_lock);
1359	if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1360		spin_unlock_bh(&np->np_thread_lock);
1361		pr_err("iSCSI Network Portal on %pISc:%hu currently not"
1362			" active.\n", &np->np_sockaddr, np->np_port);
1363		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1364				ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1365		goto new_sess_out;
1366	}
1367	spin_unlock_bh(&np->np_thread_lock);
1368
1369	conn->network_transport = np->np_network_transport;
1370
1371	pr_debug("Received iSCSI login request from %s on %s Network"
1372		" Portal %s:%hu\n", conn->login_ip, np->np_transport->name,
1373		conn->local_ip, conn->local_port);
1374
1375	pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1376	conn->conn_state	= TARG_CONN_STATE_IN_LOGIN;
1377
1378	if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1379			pdu->min_version) < 0)
1380		goto new_sess_out;
1381
1382	zero_tsih = (pdu->tsih == 0x0000);
1383	if (zero_tsih) {
1384		/*
1385		 * This is the leading connection of a new session.
1386		 * We wait until after authentication to check for
1387		 * session reinstatement.
1388		 */
1389		if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1390			goto new_sess_out;
1391	} else {
1392		/*
1393		 * Add a new connection to an existing session.
1394		 * We check for a non-existant session in
1395		 * iscsi_login_non_zero_tsih_s2() below based
1396		 * on ISID/TSIH, but wait until after authentication
1397		 * to check for connection reinstatement, etc.
1398		 */
1399		if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1400			goto new_sess_out;
1401	}
1402	/*
1403	 * SessionType: Discovery
1404	 *
1405	 * 	Locates Default Portal
1406	 *
1407	 * SessionType: Normal
1408	 *
1409	 * 	Locates Target Portal from NP -> Target IQN
1410	 */
1411	rc = iscsi_target_locate_portal(np, conn, login);
1412	if (rc < 0) {
1413		tpg = conn->tpg;
1414		goto new_sess_out;
1415	}
1416	login->zero_tsih = zero_tsih;
1417
1418	conn->sess->se_sess->sup_prot_ops =
1419		conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1420
1421	tpg = conn->tpg;
1422	if (!tpg) {
1423		pr_err("Unable to locate struct iscsi_conn->tpg\n");
1424		goto new_sess_out;
1425	}
1426
1427	if (zero_tsih) {
1428		if (iscsi_login_zero_tsih_s2(conn) < 0)
1429			goto new_sess_out;
1430	} else {
1431		if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1432			goto old_sess_out;
1433	}
1434
1435	ret = iscsi_target_start_negotiation(login, conn);
1436	if (ret < 0)
1437		goto new_sess_out;
1438
1439	iscsi_stop_login_thread_timer(np);
1440
1441	if (ret == 1) {
1442		tpg_np = conn->tpg_np;
1443
1444		iscsi_post_login_handler(np, conn, zero_tsih);
1445		iscsit_deaccess_np(np, tpg, tpg_np);
1446	}
1447
1448	tpg = NULL;
1449	tpg_np = NULL;
1450	/* Get another socket */
1451	return 1;
1452
1453new_sess_out:
1454	new_sess = true;
1455old_sess_out:
1456	tpg_np = conn->tpg_np;
1457	iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1458	new_sess = false;
1459
1460	if (tpg) {
1461		iscsit_deaccess_np(np, tpg, tpg_np);
1462		tpg = NULL;
1463		tpg_np = NULL;
1464	}
1465
1466out:
1467	return 1;
1468
1469exit:
1470	iscsi_stop_login_thread_timer(np);
1471	spin_lock_bh(&np->np_thread_lock);
1472	np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1473	spin_unlock_bh(&np->np_thread_lock);
1474
1475	return 0;
1476}
1477
1478int iscsi_target_login_thread(void *arg)
1479{
1480	struct iscsi_np *np = arg;
1481	int ret;
1482
1483	allow_signal(SIGINT);
1484
1485	while (1) {
1486		ret = __iscsi_target_login_thread(np);
1487		/*
1488		 * We break and exit here unless another sock_accept() call
1489		 * is expected.
1490		 */
1491		if (ret != 1)
1492			break;
1493	}
1494
1495	return 0;
1496}
1497