drivers/target/iscsi/iscsi_target_tpg.c - kernel/msm-4.9 - Gitiles

 /*******************************************************************************
  * This file contains iSCSI Target Portal Group related functions.
  *
  * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
  *
  * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
  *
  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  ******************************************************************************/

 #include <target/target_core_base.h>
 #include <target/target_core_fabric.h>
 #include <target/target_core_configfs.h>

 #include "iscsi_target_core.h"
 #include "iscsi_target_erl0.h"
 #include "iscsi_target_login.h"
 #include "iscsi_target_nodeattrib.h"
 #include "iscsi_target_tpg.h"
 #include "iscsi_target_util.h"
 #include "iscsi_target.h"
 #include "iscsi_target_parameters.h"

 struct iscsi_portal_group *iscsit_alloc_portal_group(struct iscsi_tiqn *tiqn, u16 tpgt)
 {
 	struct iscsi_portal_group *tpg;

 	tpg = kzalloc(sizeof(struct iscsi_portal_group), GFP_KERNEL);
 	if (!tpg) {
 		pr_err("Unable to allocate struct iscsi_portal_group\n");
 		return NULL;
 	}

 	tpg->tpgt = tpgt;
 	tpg->tpg_state = TPG_STATE_FREE;
 	tpg->tpg_tiqn = tiqn;
 	INIT_LIST_HEAD(&tpg->tpg_gnp_list);
 	INIT_LIST_HEAD(&tpg->tpg_list);
 	mutex_init(&tpg->tpg_access_lock);
 	mutex_init(&tpg->np_login_lock);
 	spin_lock_init(&tpg->tpg_state_lock);
 	spin_lock_init(&tpg->tpg_np_lock);

 	return tpg;
 }

 static void iscsit_set_default_tpg_attribs(struct iscsi_portal_group *);

 int iscsit_load_discovery_tpg(void)
 {
 	struct iscsi_param *param;
 	struct iscsi_portal_group *tpg;
 	int ret;

 	tpg = iscsit_alloc_portal_group(NULL, 1);
 	if (!tpg) {
 		pr_err("Unable to allocate struct iscsi_portal_group\n");
 		return -1;
 	}

 	ret = core_tpg_register(
 			&lio_target_fabric_configfs->tf_ops,
 			NULL, &tpg->tpg_se_tpg, tpg,
 			TRANSPORT_TPG_TYPE_DISCOVERY);
 	if (ret < 0) {
 		kfree(tpg);
 		return -1;
 	}

 	tpg->sid = 1; /* First Assigned LIO Session ID */
 	iscsit_set_default_tpg_attribs(tpg);

 	if (iscsi_create_default_params(&tpg->param_list) < 0)
 		goto out;
 	/*
 	 * By default we disable authentication for discovery sessions,
 	 * this can be changed with:
 	 *
 	 * /sys/kernel/config/target/iscsi/discovery_auth/enforce_discovery_auth
 	 */
 	param = iscsi_find_param_from_key(AUTHMETHOD, tpg->param_list);
 	if (!param)
 		goto out;

 	if (iscsi_update_param_value(param, "CHAP,None") < 0)
 		goto out;

 	tpg->tpg_attrib.authentication = 0;

 	spin_lock(&tpg->tpg_state_lock);
 	tpg->tpg_state  = TPG_STATE_ACTIVE;
 	spin_unlock(&tpg->tpg_state_lock);

 	iscsit_global->discovery_tpg = tpg;
 	pr_debug("CORE[0] - Allocated Discovery TPG\n");

 	return 0;
 out:
 	if (tpg->sid == 1)
 		core_tpg_deregister(&tpg->tpg_se_tpg);
 	kfree(tpg);
 	return -1;
 }

 void iscsit_release_discovery_tpg(void)
 {
 	struct iscsi_portal_group *tpg = iscsit_global->discovery_tpg;

 	if (!tpg)
 		return;

 	core_tpg_deregister(&tpg->tpg_se_tpg);

 	kfree(tpg);
 	iscsit_global->discovery_tpg = NULL;
 }

 struct iscsi_portal_group *iscsit_get_tpg_from_np(
 	struct iscsi_tiqn *tiqn,
 	struct iscsi_np *np)
 {
 	struct iscsi_portal_group *tpg = NULL;
 	struct iscsi_tpg_np *tpg_np;

 	spin_lock(&tiqn->tiqn_tpg_lock);
 	list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {

 		spin_lock(&tpg->tpg_state_lock);
 		if (tpg->tpg_state == TPG_STATE_FREE) {
 			spin_unlock(&tpg->tpg_state_lock);
 			continue;
 		}
 		spin_unlock(&tpg->tpg_state_lock);

 		spin_lock(&tpg->tpg_np_lock);
 		list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, tpg_np_list) {
 			if (tpg_np->tpg_np == np) {
 				spin_unlock(&tpg->tpg_np_lock);
 				spin_unlock(&tiqn->tiqn_tpg_lock);
 				return tpg;
 			}
 		}
 		spin_unlock(&tpg->tpg_np_lock);
 	}
 	spin_unlock(&tiqn->tiqn_tpg_lock);

 	return NULL;
 }

 int iscsit_get_tpg(
 	struct iscsi_portal_group *tpg)
 {
 	int ret;

 	ret = mutex_lock_interruptible(&tpg->tpg_access_lock);
 	return ((ret != 0) || signal_pending(current)) ? -1 : 0;
 }

 void iscsit_put_tpg(struct iscsi_portal_group *tpg)
 {
 	mutex_unlock(&tpg->tpg_access_lock);
 }

 static void iscsit_clear_tpg_np_login_thread(
 	struct iscsi_tpg_np *tpg_np,
 	struct iscsi_portal_group *tpg)
 {
 	if (!tpg_np->tpg_np) {
 		pr_err("struct iscsi_tpg_np->tpg_np is NULL!\n");
 		return;
 	}

 	iscsit_reset_np_thread(tpg_np->tpg_np, tpg_np, tpg);
 }

 void iscsit_clear_tpg_np_login_threads(
 	struct iscsi_portal_group *tpg)
 {
 	struct iscsi_tpg_np *tpg_np;

 	spin_lock(&tpg->tpg_np_lock);
 	list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, tpg_np_list) {
 		if (!tpg_np->tpg_np) {
 			pr_err("struct iscsi_tpg_np->tpg_np is NULL!\n");
 			continue;
 		}
 		spin_unlock(&tpg->tpg_np_lock);
 		iscsit_clear_tpg_np_login_thread(tpg_np, tpg);
 		spin_lock(&tpg->tpg_np_lock);
 	}
 	spin_unlock(&tpg->tpg_np_lock);
 }

 void iscsit_tpg_dump_params(struct iscsi_portal_group *tpg)
 {
 	iscsi_print_params(tpg->param_list);
 }

 static void iscsit_set_default_tpg_attribs(struct iscsi_portal_group *tpg)
 {
 	struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

 	a->authentication = TA_AUTHENTICATION;
 	a->login_timeout = TA_LOGIN_TIMEOUT;
 	a->netif_timeout = TA_NETIF_TIMEOUT;
 	a->default_cmdsn_depth = TA_DEFAULT_CMDSN_DEPTH;
 	a->generate_node_acls = TA_GENERATE_NODE_ACLS;
 	a->cache_dynamic_acls = TA_CACHE_DYNAMIC_ACLS;
 	a->demo_mode_write_protect = TA_DEMO_MODE_WRITE_PROTECT;
 	a->prod_mode_write_protect = TA_PROD_MODE_WRITE_PROTECT;
 }

 int iscsit_tpg_add_portal_group(struct iscsi_tiqn *tiqn, struct iscsi_portal_group *tpg)
 {
 	if (tpg->tpg_state != TPG_STATE_FREE) {
 		pr_err("Unable to add iSCSI Target Portal Group: %d"
 			" while not in TPG_STATE_FREE state.\n", tpg->tpgt);
 		return -EEXIST;
 	}
 	iscsit_set_default_tpg_attribs(tpg);

 	if (iscsi_create_default_params(&tpg->param_list) < 0)
 		goto err_out;

 	ISCSI_TPG_ATTRIB(tpg)->tpg = tpg;

 	spin_lock(&tpg->tpg_state_lock);
 	tpg->tpg_state	= TPG_STATE_INACTIVE;
 	spin_unlock(&tpg->tpg_state_lock);

 	spin_lock(&tiqn->tiqn_tpg_lock);
 	list_add_tail(&tpg->tpg_list, &tiqn->tiqn_tpg_list);
 	tiqn->tiqn_ntpgs++;
 	pr_debug("CORE[%s]_TPG[%hu] - Added iSCSI Target Portal Group\n",
 			tiqn->tiqn, tpg->tpgt);
 	spin_unlock(&tiqn->tiqn_tpg_lock);

 	return 0;
 err_out:
 	if (tpg->param_list) {
 		iscsi_release_param_list(tpg->param_list);
 		tpg->param_list = NULL;
 	}
 	kfree(tpg);
 	return -ENOMEM;
 }

 int iscsit_tpg_del_portal_group(
 	struct iscsi_tiqn *tiqn,
 	struct iscsi_portal_group *tpg,
 	int force)
 {
 	u8 old_state = tpg->tpg_state;

 	spin_lock(&tpg->tpg_state_lock);
 	tpg->tpg_state = TPG_STATE_INACTIVE;
 	spin_unlock(&tpg->tpg_state_lock);

 	if (iscsit_release_sessions_for_tpg(tpg, force) < 0) {
 		pr_err("Unable to delete iSCSI Target Portal Group:"
 			" %hu while active sessions exist, and force=0\n",
 			tpg->tpgt);
 		tpg->tpg_state = old_state;
 		return -EPERM;
 	}

 	core_tpg_clear_object_luns(&tpg->tpg_se_tpg);

 	if (tpg->param_list) {
 		iscsi_release_param_list(tpg->param_list);
 		tpg->param_list = NULL;
 	}

 	core_tpg_deregister(&tpg->tpg_se_tpg);

 	spin_lock(&tpg->tpg_state_lock);
 	tpg->tpg_state = TPG_STATE_FREE;
 	spin_unlock(&tpg->tpg_state_lock);

 	spin_lock(&tiqn->tiqn_tpg_lock);
 	tiqn->tiqn_ntpgs--;
 	list_del(&tpg->tpg_list);
 	spin_unlock(&tiqn->tiqn_tpg_lock);

 	pr_debug("CORE[%s]_TPG[%hu] - Deleted iSCSI Target Portal Group\n",
 			tiqn->tiqn, tpg->tpgt);

 	kfree(tpg);
 	return 0;
 }

 int iscsit_tpg_enable_portal_group(struct iscsi_portal_group *tpg)
 {
 	struct iscsi_param *param;
 	struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 	int ret;

 	spin_lock(&tpg->tpg_state_lock);
 	if (tpg->tpg_state == TPG_STATE_ACTIVE) {
 		pr_err("iSCSI target portal group: %hu is already"
 			" active, ignoring request.\n", tpg->tpgt);
 		spin_unlock(&tpg->tpg_state_lock);
 		return -EINVAL;
 	}
 	/*
 	 * Make sure that AuthMethod does not contain None as an option
 	 * unless explictly disabled.  Set the default to CHAP if authentication
 	 * is enforced (as per default), and remove the NONE option.
 	 */
 	param = iscsi_find_param_from_key(AUTHMETHOD, tpg->param_list);
 	if (!param) {
 		spin_unlock(&tpg->tpg_state_lock);
 		return -EINVAL;
 	}

 	if (ISCSI_TPG_ATTRIB(tpg)->authentication) {
 		if (!strcmp(param->value, NONE)) {
 			ret = iscsi_update_param_value(param, CHAP);
 			if (ret)
 				goto err;
 		}

 		ret = iscsit_ta_authentication(tpg, 1);
 		if (ret < 0)
 			goto err;
 	}

 	tpg->tpg_state = TPG_STATE_ACTIVE;
 	spin_unlock(&tpg->tpg_state_lock);

 	spin_lock(&tiqn->tiqn_tpg_lock);
 	tiqn->tiqn_active_tpgs++;
 	pr_debug("iSCSI_TPG[%hu] - Enabled iSCSI Target Portal Group\n",
 			tpg->tpgt);
 	spin_unlock(&tiqn->tiqn_tpg_lock);

 	return 0;

 err:
 	spin_unlock(&tpg->tpg_state_lock);
 	return ret;
 }

 int iscsit_tpg_disable_portal_group(struct iscsi_portal_group *tpg, int force)
 {
 	struct iscsi_tiqn *tiqn;
 	u8 old_state = tpg->tpg_state;

 	spin_lock(&tpg->tpg_state_lock);
 	if (tpg->tpg_state == TPG_STATE_INACTIVE) {
 		pr_err("iSCSI Target Portal Group: %hu is already"
 			" inactive, ignoring request.\n", tpg->tpgt);
 		spin_unlock(&tpg->tpg_state_lock);
 		return -EINVAL;
 	}
 	tpg->tpg_state = TPG_STATE_INACTIVE;
 	spin_unlock(&tpg->tpg_state_lock);

 	iscsit_clear_tpg_np_login_threads(tpg);

 	if (iscsit_release_sessions_for_tpg(tpg, force) < 0) {
 		spin_lock(&tpg->tpg_state_lock);
 		tpg->tpg_state = old_state;
 		spin_unlock(&tpg->tpg_state_lock);
 		pr_err("Unable to disable iSCSI Target Portal Group:"
 			" %hu while active sessions exist, and force=0\n",
 			tpg->tpgt);
 		return -EPERM;
 	}

 	tiqn = tpg->tpg_tiqn;
 	if (!tiqn || (tpg == iscsit_global->discovery_tpg))
 		return 0;

 	spin_lock(&tiqn->tiqn_tpg_lock);
 	tiqn->tiqn_active_tpgs--;
 	pr_debug("iSCSI_TPG[%hu] - Disabled iSCSI Target Portal Group\n",
 			tpg->tpgt);
 	spin_unlock(&tiqn->tiqn_tpg_lock);

 	return 0;
 }

 struct iscsi_node_attrib *iscsit_tpg_get_node_attrib(
 	struct iscsi_session *sess)
 {
 	struct se_session *se_sess = sess->se_sess;
 	struct se_node_acl *se_nacl = se_sess->se_node_acl;
 	struct iscsi_node_acl *acl = container_of(se_nacl, struct iscsi_node_acl,
 					se_node_acl);

 	return &acl->node_attrib;
 }

 struct iscsi_tpg_np *iscsit_tpg_locate_child_np(
 	struct iscsi_tpg_np *tpg_np,
 	int network_transport)
 {
 	struct iscsi_tpg_np *tpg_np_child, *tpg_np_child_tmp;

 	spin_lock(&tpg_np->tpg_np_parent_lock);
 	list_for_each_entry_safe(tpg_np_child, tpg_np_child_tmp,
 			&tpg_np->tpg_np_parent_list, tpg_np_child_list) {
 		if (tpg_np_child->tpg_np->np_network_transport ==
 				network_transport) {
 			spin_unlock(&tpg_np->tpg_np_parent_lock);
 			return tpg_np_child;
 		}
 	}
 	spin_unlock(&tpg_np->tpg_np_parent_lock);

 	return NULL;
 }

 struct iscsi_tpg_np *iscsit_tpg_add_network_portal(
 	struct iscsi_portal_group *tpg,
 	struct __kernel_sockaddr_storage *sockaddr,
 	char *ip_str,
 	struct iscsi_tpg_np *tpg_np_parent,
 	int network_transport)
 {
 	struct iscsi_np *np;
 	struct iscsi_tpg_np *tpg_np;

 	tpg_np = kzalloc(sizeof(struct iscsi_tpg_np), GFP_KERNEL);
 	if (!tpg_np) {
 		pr_err("Unable to allocate memory for"
 				" struct iscsi_tpg_np.\n");
 		return ERR_PTR(-ENOMEM);
 	}

 	np = iscsit_add_np(sockaddr, ip_str, network_transport);
 	if (IS_ERR(np)) {
 		kfree(tpg_np);
 		return ERR_CAST(np);
 	}

 	INIT_LIST_HEAD(&tpg_np->tpg_np_list);
 	INIT_LIST_HEAD(&tpg_np->tpg_np_child_list);
 	INIT_LIST_HEAD(&tpg_np->tpg_np_parent_list);
 	spin_lock_init(&tpg_np->tpg_np_parent_lock);
 	tpg_np->tpg_np		= np;
 	tpg_np->tpg		= tpg;

 	spin_lock(&tpg->tpg_np_lock);
 	list_add_tail(&tpg_np->tpg_np_list, &tpg->tpg_gnp_list);
 	tpg->num_tpg_nps++;
 	if (tpg->tpg_tiqn)
 		tpg->tpg_tiqn->tiqn_num_tpg_nps++;
 	spin_unlock(&tpg->tpg_np_lock);

 	if (tpg_np_parent) {
 		tpg_np->tpg_np_parent = tpg_np_parent;
 		spin_lock(&tpg_np_parent->tpg_np_parent_lock);
 		list_add_tail(&tpg_np->tpg_np_child_list,
 			&tpg_np_parent->tpg_np_parent_list);
 		spin_unlock(&tpg_np_parent->tpg_np_parent_lock);
 	}

 	pr_debug("CORE[%s] - Added Network Portal: %s:%hu,%hu on %s\n",
 		tpg->tpg_tiqn->tiqn, np->np_ip, np->np_port, tpg->tpgt,
 		(np->np_network_transport == ISCSI_TCP) ? "TCP" : "SCTP");

 	return tpg_np;
 }

 static int iscsit_tpg_release_np(
 	struct iscsi_tpg_np *tpg_np,
 	struct iscsi_portal_group *tpg,
 	struct iscsi_np *np)
 {
 	iscsit_clear_tpg_np_login_thread(tpg_np, tpg);

 	pr_debug("CORE[%s] - Removed Network Portal: %s:%hu,%hu on %s\n",
 		tpg->tpg_tiqn->tiqn, np->np_ip, np->np_port, tpg->tpgt,
 		(np->np_network_transport == ISCSI_TCP) ? "TCP" : "SCTP");

 	tpg_np->tpg_np = NULL;
 	tpg_np->tpg = NULL;
 	kfree(tpg_np);
 	/*
 	 * iscsit_del_np() will shutdown struct iscsi_np when last TPG reference is released.
 	 */
 	return iscsit_del_np(np);
 }

 int iscsit_tpg_del_network_portal(
 	struct iscsi_portal_group *tpg,
 	struct iscsi_tpg_np *tpg_np)
 {
 	struct iscsi_np *np;
 	struct iscsi_tpg_np *tpg_np_child, *tpg_np_child_tmp;
 	int ret = 0;

 	np = tpg_np->tpg_np;
 	if (!np) {
 		pr_err("Unable to locate struct iscsi_np from"
 				" struct iscsi_tpg_np\n");
 		return -EINVAL;
 	}

 	if (!tpg_np->tpg_np_parent) {
 		/*
 		 * We are the parent tpg network portal.  Release all of the
 		 * child tpg_np's (eg: the non ISCSI_TCP ones) on our parent
 		 * list first.
 		 */
 		list_for_each_entry_safe(tpg_np_child, tpg_np_child_tmp,
 				&tpg_np->tpg_np_parent_list,
 				tpg_np_child_list) {
 			ret = iscsit_tpg_del_network_portal(tpg, tpg_np_child);
 			if (ret < 0)
 				pr_err("iscsit_tpg_del_network_portal()"
 					" failed: %d\n", ret);
 		}
 	} else {
 		/*
 		 * We are not the parent ISCSI_TCP tpg network portal.  Release
 		 * our own network portals from the child list.
 		 */
 		spin_lock(&tpg_np->tpg_np_parent->tpg_np_parent_lock);
 		list_del(&tpg_np->tpg_np_child_list);
 		spin_unlock(&tpg_np->tpg_np_parent->tpg_np_parent_lock);
 	}

 	spin_lock(&tpg->tpg_np_lock);
 	list_del(&tpg_np->tpg_np_list);
 	tpg->num_tpg_nps--;
 	if (tpg->tpg_tiqn)
 		tpg->tpg_tiqn->tiqn_num_tpg_nps--;
 	spin_unlock(&tpg->tpg_np_lock);

 	return iscsit_tpg_release_np(tpg_np, tpg, np);
 }

 int iscsit_tpg_set_initiator_node_queue_depth(
 	struct iscsi_portal_group *tpg,
 	unsigned char *initiatorname,
 	u32 queue_depth,
 	int force)
 {
 	return core_tpg_set_initiator_node_queue_depth(&tpg->tpg_se_tpg,
 		initiatorname, queue_depth, force);
 }

 int iscsit_ta_authentication(struct iscsi_portal_group *tpg, u32 authentication)
 {
 	unsigned char buf1[256], buf2[256], *none = NULL;
 	int len;
 	struct iscsi_param *param;
 	struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

 	if ((authentication != 1) && (authentication != 0)) {
 		pr_err("Illegal value for authentication parameter:"
 			" %u, ignoring request.\n", authentication);
 		return -EINVAL;
 	}

 	memset(buf1, 0, sizeof(buf1));
 	memset(buf2, 0, sizeof(buf2));

 	param = iscsi_find_param_from_key(AUTHMETHOD, tpg->param_list);
 	if (!param)
 		return -EINVAL;

 	if (authentication) {
 		snprintf(buf1, sizeof(buf1), "%s", param->value);
 		none = strstr(buf1, NONE);
 		if (!none)
 			goto out;
 		if (!strncmp(none + 4, ",", 1)) {
 			if (!strcmp(buf1, none))
 				sprintf(buf2, "%s", none+5);
 			else {
 				none--;
 				*none = '\0';
 				len = sprintf(buf2, "%s", buf1);
 				none += 5;
 				sprintf(buf2 + len, "%s", none);
 			}
 		} else {
 			none--;
 			*none = '\0';
 			sprintf(buf2, "%s", buf1);
 		}
 		if (iscsi_update_param_value(param, buf2) < 0)
 			return -EINVAL;
 	} else {
 		snprintf(buf1, sizeof(buf1), "%s", param->value);
 		none = strstr(buf1, NONE);
 		if (none)
 			goto out;
 		strncat(buf1, ",", strlen(","));
 		strncat(buf1, NONE, strlen(NONE));
 		if (iscsi_update_param_value(param, buf1) < 0)
 			return -EINVAL;
 	}

 out:
 	a->authentication = authentication;
 	pr_debug("%s iSCSI Authentication Methods for TPG: %hu.\n",
 		a->authentication ? "Enforcing" : "Disabling", tpg->tpgt);

 	return 0;
 }

 int iscsit_ta_login_timeout(
 	struct iscsi_portal_group *tpg,
 	u32 login_timeout)
 {
 	struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

 	if (login_timeout > TA_LOGIN_TIMEOUT_MAX) {
 		pr_err("Requested Login Timeout %u larger than maximum"
 			" %u\n", login_timeout, TA_LOGIN_TIMEOUT_MAX);
 		return -EINVAL;
 	} else if (login_timeout < TA_LOGIN_TIMEOUT_MIN) {
 		pr_err("Requested Logout Timeout %u smaller than"
 			" minimum %u\n", login_timeout, TA_LOGIN_TIMEOUT_MIN);
 		return -EINVAL;
 	}

 	a->login_timeout = login_timeout;
 	pr_debug("Set Logout Timeout to %u for Target Portal Group"
 		" %hu\n", a->login_timeout, tpg->tpgt);

 	return 0;
 }

 int iscsit_ta_netif_timeout(
 	struct iscsi_portal_group *tpg,
 	u32 netif_timeout)
 {
 	struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

 	if (netif_timeout > TA_NETIF_TIMEOUT_MAX) {
 		pr_err("Requested Network Interface Timeout %u larger"
 			" than maximum %u\n", netif_timeout,
 				TA_NETIF_TIMEOUT_MAX);
 		return -EINVAL;
 	} else if (netif_timeout < TA_NETIF_TIMEOUT_MIN) {
 		pr_err("Requested Network Interface Timeout %u smaller"
 			" than minimum %u\n", netif_timeout,
 				TA_NETIF_TIMEOUT_MIN);
 		return -EINVAL;
 	}

 	a->netif_timeout = netif_timeout;
 	pr_debug("Set Network Interface Timeout to %u for"
 		" Target Portal Group %hu\n", a->netif_timeout, tpg->tpgt);

 	return 0;
 }

 int iscsit_ta_generate_node_acls(
 	struct iscsi_portal_group *tpg,
 	u32 flag)
 {
 	struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

 	if ((flag != 0) && (flag != 1)) {
 		pr_err("Illegal value %d\n", flag);
 		return -EINVAL;
 	}

 	a->generate_node_acls = flag;
 	pr_debug("iSCSI_TPG[%hu] - Generate Initiator Portal Group ACLs: %s\n",
 		tpg->tpgt, (a->generate_node_acls) ? "Enabled" : "Disabled");

 	return 0;
 }

 int iscsit_ta_default_cmdsn_depth(
 	struct iscsi_portal_group *tpg,
 	u32 tcq_depth)
 {
 	struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

 	if (tcq_depth > TA_DEFAULT_CMDSN_DEPTH_MAX) {
 		pr_err("Requested Default Queue Depth: %u larger"
 			" than maximum %u\n", tcq_depth,
 				TA_DEFAULT_CMDSN_DEPTH_MAX);
 		return -EINVAL;
 	} else if (tcq_depth < TA_DEFAULT_CMDSN_DEPTH_MIN) {
 		pr_err("Requested Default Queue Depth: %u smaller"
 			" than minimum %u\n", tcq_depth,
 				TA_DEFAULT_CMDSN_DEPTH_MIN);
 		return -EINVAL;
 	}

 	a->default_cmdsn_depth = tcq_depth;
 	pr_debug("iSCSI_TPG[%hu] - Set Default CmdSN TCQ Depth to %u\n",
 		tpg->tpgt, a->default_cmdsn_depth);

 	return 0;
 }

 int iscsit_ta_cache_dynamic_acls(
 	struct iscsi_portal_group *tpg,
 	u32 flag)
 {
 	struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

 	if ((flag != 0) && (flag != 1)) {
 		pr_err("Illegal value %d\n", flag);
 		return -EINVAL;
 	}

 	a->cache_dynamic_acls = flag;
 	pr_debug("iSCSI_TPG[%hu] - Cache Dynamic Initiator Portal Group"
 		" ACLs %s\n", tpg->tpgt, (a->cache_dynamic_acls) ?
 		"Enabled" : "Disabled");

 	return 0;
 }

 int iscsit_ta_demo_mode_write_protect(
 	struct iscsi_portal_group *tpg,
 	u32 flag)
 {
 	struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

 	if ((flag != 0) && (flag != 1)) {
 		pr_err("Illegal value %d\n", flag);
 		return -EINVAL;
 	}

 	a->demo_mode_write_protect = flag;
 	pr_debug("iSCSI_TPG[%hu] - Demo Mode Write Protect bit: %s\n",
 		tpg->tpgt, (a->demo_mode_write_protect) ? "ON" : "OFF");

 	return 0;
 }

 int iscsit_ta_prod_mode_write_protect(
 	struct iscsi_portal_group *tpg,
 	u32 flag)
 {
 	struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

 	if ((flag != 0) && (flag != 1)) {
 		pr_err("Illegal value %d\n", flag);
 		return -EINVAL;
 	}

 	a->prod_mode_write_protect = flag;
 	pr_debug("iSCSI_TPG[%hu] - Production Mode Write Protect bit:"
 		" %s\n", tpg->tpgt, (a->prod_mode_write_protect) ?
 		"ON" : "OFF");

 	return 0;
 }
	/*******************************************************************************
	* This file contains iSCSI Target Portal Group related functions.
	*
	* \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
	*
	* Licensed to the Linux Foundation under the General Public License (GPL) version 2.
	*
	* Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	******************************************************************************/

	#include <target/target_core_base.h>
	#include <target/target_core_fabric.h>
	#include <target/target_core_configfs.h>

	#include "iscsi_target_core.h"
	#include "iscsi_target_erl0.h"
	#include "iscsi_target_login.h"
	#include "iscsi_target_nodeattrib.h"
	#include "iscsi_target_tpg.h"
	#include "iscsi_target_util.h"
	#include "iscsi_target.h"
	#include "iscsi_target_parameters.h"

	struct iscsi_portal_group iscsit_alloc_portal_group(struct iscsi_tiqn tiqn, u16 tpgt)
	{
	struct iscsi_portal_group *tpg;

	tpg = kzalloc(sizeof(struct iscsi_portal_group), GFP_KERNEL);
	if (!tpg) {
	pr_err("Unable to allocate struct iscsi_portal_group\n");
	return NULL;
	}

	tpg->tpgt = tpgt;
	tpg->tpg_state = TPG_STATE_FREE;
	tpg->tpg_tiqn = tiqn;
	INIT_LIST_HEAD(&tpg->tpg_gnp_list);
	INIT_LIST_HEAD(&tpg->tpg_list);
	mutex_init(&tpg->tpg_access_lock);
	mutex_init(&tpg->np_login_lock);
	spin_lock_init(&tpg->tpg_state_lock);
	spin_lock_init(&tpg->tpg_np_lock);

	return tpg;
	}

	static void iscsit_set_default_tpg_attribs(struct iscsi_portal_group *);

	int iscsit_load_discovery_tpg(void)
	{
	struct iscsi_param *param;
	struct iscsi_portal_group *tpg;
	int ret;

	tpg = iscsit_alloc_portal_group(NULL, 1);
	if (!tpg) {
	pr_err("Unable to allocate struct iscsi_portal_group\n");
	return -1;
	}

	ret = core_tpg_register(
	&lio_target_fabric_configfs->tf_ops,
	NULL, &tpg->tpg_se_tpg, tpg,
	TRANSPORT_TPG_TYPE_DISCOVERY);
	if (ret < 0) {
	kfree(tpg);
	return -1;
	}

	tpg->sid = 1; /* First Assigned LIO Session ID */
	iscsit_set_default_tpg_attribs(tpg);

	if (iscsi_create_default_params(&tpg->param_list) < 0)
	goto out;
	/*
	* By default we disable authentication for discovery sessions,
	* this can be changed with:
	*
	* /sys/kernel/config/target/iscsi/discovery_auth/enforce_discovery_auth
	*/
	param = iscsi_find_param_from_key(AUTHMETHOD, tpg->param_list);
	if (!param)
	goto out;

	if (iscsi_update_param_value(param, "CHAP,None") < 0)
	goto out;

	tpg->tpg_attrib.authentication = 0;

	spin_lock(&tpg->tpg_state_lock);
	tpg->tpg_state = TPG_STATE_ACTIVE;
	spin_unlock(&tpg->tpg_state_lock);

	iscsit_global->discovery_tpg = tpg;
	pr_debug("CORE[0] - Allocated Discovery TPG\n");

	return 0;
	out:
	if (tpg->sid == 1)
	core_tpg_deregister(&tpg->tpg_se_tpg);
	kfree(tpg);
	return -1;
	}

	void iscsit_release_discovery_tpg(void)
	{
	struct iscsi_portal_group *tpg = iscsit_global->discovery_tpg;

	if (!tpg)
	return;

	core_tpg_deregister(&tpg->tpg_se_tpg);

	kfree(tpg);
	iscsit_global->discovery_tpg = NULL;
	}

	struct iscsi_portal_group *iscsit_get_tpg_from_np(
	struct iscsi_tiqn *tiqn,
	struct iscsi_np *np)
	{
	struct iscsi_portal_group *tpg = NULL;
	struct iscsi_tpg_np *tpg_np;

	spin_lock(&tiqn->tiqn_tpg_lock);
	list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {

	spin_lock(&tpg->tpg_state_lock);
	if (tpg->tpg_state == TPG_STATE_FREE) {
	spin_unlock(&tpg->tpg_state_lock);
	continue;
	}
	spin_unlock(&tpg->tpg_state_lock);

	spin_lock(&tpg->tpg_np_lock);
	list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, tpg_np_list) {
	if (tpg_np->tpg_np == np) {
	spin_unlock(&tpg->tpg_np_lock);
	spin_unlock(&tiqn->tiqn_tpg_lock);
	return tpg;
	}
	}
	spin_unlock(&tpg->tpg_np_lock);
	}
	spin_unlock(&tiqn->tiqn_tpg_lock);

	return NULL;
	}

	int iscsit_get_tpg(
	struct iscsi_portal_group *tpg)
	{
	int ret;

	ret = mutex_lock_interruptible(&tpg->tpg_access_lock);
	return ((ret != 0) \|\| signal_pending(current)) ? -1 : 0;
	}

	void iscsit_put_tpg(struct iscsi_portal_group *tpg)
	{
	mutex_unlock(&tpg->tpg_access_lock);
	}

	static void iscsit_clear_tpg_np_login_thread(
	struct iscsi_tpg_np *tpg_np,
	struct iscsi_portal_group *tpg)
	{
	if (!tpg_np->tpg_np) {
	pr_err("struct iscsi_tpg_np->tpg_np is NULL!\n");
	return;
	}

	iscsit_reset_np_thread(tpg_np->tpg_np, tpg_np, tpg);
	}

	void iscsit_clear_tpg_np_login_threads(
	struct iscsi_portal_group *tpg)
	{
	struct iscsi_tpg_np *tpg_np;

	spin_lock(&tpg->tpg_np_lock);
	list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, tpg_np_list) {
	if (!tpg_np->tpg_np) {
	pr_err("struct iscsi_tpg_np->tpg_np is NULL!\n");
	continue;
	}
	spin_unlock(&tpg->tpg_np_lock);
	iscsit_clear_tpg_np_login_thread(tpg_np, tpg);
	spin_lock(&tpg->tpg_np_lock);
	}
	spin_unlock(&tpg->tpg_np_lock);
	}

	void iscsit_tpg_dump_params(struct iscsi_portal_group *tpg)
	{
	iscsi_print_params(tpg->param_list);
	}

	static void iscsit_set_default_tpg_attribs(struct iscsi_portal_group *tpg)
	{
	struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

	a->authentication = TA_AUTHENTICATION;
	a->login_timeout = TA_LOGIN_TIMEOUT;
	a->netif_timeout = TA_NETIF_TIMEOUT;
	a->default_cmdsn_depth = TA_DEFAULT_CMDSN_DEPTH;
	a->generate_node_acls = TA_GENERATE_NODE_ACLS;
	a->cache_dynamic_acls = TA_CACHE_DYNAMIC_ACLS;
	a->demo_mode_write_protect = TA_DEMO_MODE_WRITE_PROTECT;
	a->prod_mode_write_protect = TA_PROD_MODE_WRITE_PROTECT;
	}

	int iscsit_tpg_add_portal_group(struct iscsi_tiqn tiqn, struct iscsi_portal_group tpg)
	{
	if (tpg->tpg_state != TPG_STATE_FREE) {
	pr_err("Unable to add iSCSI Target Portal Group: %d"
	" while not in TPG_STATE_FREE state.\n", tpg->tpgt);
	return -EEXIST;
	}
	iscsit_set_default_tpg_attribs(tpg);

	if (iscsi_create_default_params(&tpg->param_list) < 0)
	goto err_out;

	ISCSI_TPG_ATTRIB(tpg)->tpg = tpg;

	spin_lock(&tpg->tpg_state_lock);
	tpg->tpg_state = TPG_STATE_INACTIVE;
	spin_unlock(&tpg->tpg_state_lock);

	spin_lock(&tiqn->tiqn_tpg_lock);
	list_add_tail(&tpg->tpg_list, &tiqn->tiqn_tpg_list);
	tiqn->tiqn_ntpgs++;
	pr_debug("CORE[%s]_TPG[%hu] - Added iSCSI Target Portal Group\n",
	tiqn->tiqn, tpg->tpgt);
	spin_unlock(&tiqn->tiqn_tpg_lock);

	return 0;
	err_out:
	if (tpg->param_list) {
	iscsi_release_param_list(tpg->param_list);
	tpg->param_list = NULL;
	}
	kfree(tpg);
	return -ENOMEM;
	}

	int iscsit_tpg_del_portal_group(
	struct iscsi_tiqn *tiqn,
	struct iscsi_portal_group *tpg,
	int force)
	{
	u8 old_state = tpg->tpg_state;

	spin_lock(&tpg->tpg_state_lock);
	tpg->tpg_state = TPG_STATE_INACTIVE;
	spin_unlock(&tpg->tpg_state_lock);

	if (iscsit_release_sessions_for_tpg(tpg, force) < 0) {
	pr_err("Unable to delete iSCSI Target Portal Group:"
	" %hu while active sessions exist, and force=0\n",
	tpg->tpgt);
	tpg->tpg_state = old_state;
	return -EPERM;
	}

	core_tpg_clear_object_luns(&tpg->tpg_se_tpg);

	if (tpg->param_list) {
	iscsi_release_param_list(tpg->param_list);
	tpg->param_list = NULL;
	}

	core_tpg_deregister(&tpg->tpg_se_tpg);

	spin_lock(&tpg->tpg_state_lock);
	tpg->tpg_state = TPG_STATE_FREE;
	spin_unlock(&tpg->tpg_state_lock);

	spin_lock(&tiqn->tiqn_tpg_lock);
	tiqn->tiqn_ntpgs--;
	list_del(&tpg->tpg_list);
	spin_unlock(&tiqn->tiqn_tpg_lock);

	pr_debug("CORE[%s]_TPG[%hu] - Deleted iSCSI Target Portal Group\n",
	tiqn->tiqn, tpg->tpgt);

	kfree(tpg);
	return 0;
	}

	int iscsit_tpg_enable_portal_group(struct iscsi_portal_group *tpg)
	{
	struct iscsi_param *param;
	struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
	int ret;

	spin_lock(&tpg->tpg_state_lock);
	if (tpg->tpg_state == TPG_STATE_ACTIVE) {
	pr_err("iSCSI target portal group: %hu is already"
	" active, ignoring request.\n", tpg->tpgt);
	spin_unlock(&tpg->tpg_state_lock);
	return -EINVAL;
	}
	/*
	* Make sure that AuthMethod does not contain None as an option
	* unless explictly disabled. Set the default to CHAP if authentication
	* is enforced (as per default), and remove the NONE option.
	*/
	param = iscsi_find_param_from_key(AUTHMETHOD, tpg->param_list);
	if (!param) {
	spin_unlock(&tpg->tpg_state_lock);
	return -EINVAL;
	}

	if (ISCSI_TPG_ATTRIB(tpg)->authentication) {
	if (!strcmp(param->value, NONE)) {
	ret = iscsi_update_param_value(param, CHAP);
	if (ret)
	goto err;
	}

	ret = iscsit_ta_authentication(tpg, 1);
	if (ret < 0)
	goto err;
	}

	tpg->tpg_state = TPG_STATE_ACTIVE;
	spin_unlock(&tpg->tpg_state_lock);

	spin_lock(&tiqn->tiqn_tpg_lock);
	tiqn->tiqn_active_tpgs++;
	pr_debug("iSCSI_TPG[%hu] - Enabled iSCSI Target Portal Group\n",
	tpg->tpgt);
	spin_unlock(&tiqn->tiqn_tpg_lock);

	return 0;

	err:
	spin_unlock(&tpg->tpg_state_lock);
	return ret;
	}

	int iscsit_tpg_disable_portal_group(struct iscsi_portal_group *tpg, int force)
	{
	struct iscsi_tiqn *tiqn;
	u8 old_state = tpg->tpg_state;

	spin_lock(&tpg->tpg_state_lock);
	if (tpg->tpg_state == TPG_STATE_INACTIVE) {
	pr_err("iSCSI Target Portal Group: %hu is already"
	" inactive, ignoring request.\n", tpg->tpgt);
	spin_unlock(&tpg->tpg_state_lock);
	return -EINVAL;
	}
	tpg->tpg_state = TPG_STATE_INACTIVE;
	spin_unlock(&tpg->tpg_state_lock);

	iscsit_clear_tpg_np_login_threads(tpg);

	if (iscsit_release_sessions_for_tpg(tpg, force) < 0) {
	spin_lock(&tpg->tpg_state_lock);
	tpg->tpg_state = old_state;
	spin_unlock(&tpg->tpg_state_lock);
	pr_err("Unable to disable iSCSI Target Portal Group:"
	" %hu while active sessions exist, and force=0\n",
	tpg->tpgt);
	return -EPERM;
	}

	tiqn = tpg->tpg_tiqn;
	if (!tiqn \|\| (tpg == iscsit_global->discovery_tpg))
	return 0;

	spin_lock(&tiqn->tiqn_tpg_lock);
	tiqn->tiqn_active_tpgs--;
	pr_debug("iSCSI_TPG[%hu] - Disabled iSCSI Target Portal Group\n",
	tpg->tpgt);
	spin_unlock(&tiqn->tiqn_tpg_lock);

	return 0;
	}

	struct iscsi_node_attrib *iscsit_tpg_get_node_attrib(
	struct iscsi_session *sess)
	{
	struct se_session *se_sess = sess->se_sess;
	struct se_node_acl *se_nacl = se_sess->se_node_acl;
	struct iscsi_node_acl *acl = container_of(se_nacl, struct iscsi_node_acl,
	se_node_acl);

	return &acl->node_attrib;
	}

	struct iscsi_tpg_np *iscsit_tpg_locate_child_np(
	struct iscsi_tpg_np *tpg_np,
	int network_transport)
	{
	struct iscsi_tpg_np tpg_np_child, tpg_np_child_tmp;

	spin_lock(&tpg_np->tpg_np_parent_lock);
	list_for_each_entry_safe(tpg_np_child, tpg_np_child_tmp,
	&tpg_np->tpg_np_parent_list, tpg_np_child_list) {
	if (tpg_np_child->tpg_np->np_network_transport ==
	network_transport) {
	spin_unlock(&tpg_np->tpg_np_parent_lock);
	return tpg_np_child;
	}
	}
	spin_unlock(&tpg_np->tpg_np_parent_lock);

	return NULL;
	}

	struct iscsi_tpg_np *iscsit_tpg_add_network_portal(
	struct iscsi_portal_group *tpg,
	struct __kernel_sockaddr_storage *sockaddr,
	char *ip_str,
	struct iscsi_tpg_np *tpg_np_parent,
	int network_transport)
	{
	struct iscsi_np *np;
	struct iscsi_tpg_np *tpg_np;

	tpg_np = kzalloc(sizeof(struct iscsi_tpg_np), GFP_KERNEL);
	if (!tpg_np) {
	pr_err("Unable to allocate memory for"
	" struct iscsi_tpg_np.\n");
	return ERR_PTR(-ENOMEM);
	}

	np = iscsit_add_np(sockaddr, ip_str, network_transport);
	if (IS_ERR(np)) {
	kfree(tpg_np);
	return ERR_CAST(np);
	}

	INIT_LIST_HEAD(&tpg_np->tpg_np_list);
	INIT_LIST_HEAD(&tpg_np->tpg_np_child_list);
	INIT_LIST_HEAD(&tpg_np->tpg_np_parent_list);
	spin_lock_init(&tpg_np->tpg_np_parent_lock);
	tpg_np->tpg_np = np;
	tpg_np->tpg = tpg;

	spin_lock(&tpg->tpg_np_lock);
	list_add_tail(&tpg_np->tpg_np_list, &tpg->tpg_gnp_list);
	tpg->num_tpg_nps++;
	if (tpg->tpg_tiqn)
	tpg->tpg_tiqn->tiqn_num_tpg_nps++;
	spin_unlock(&tpg->tpg_np_lock);

	if (tpg_np_parent) {
	tpg_np->tpg_np_parent = tpg_np_parent;
	spin_lock(&tpg_np_parent->tpg_np_parent_lock);
	list_add_tail(&tpg_np->tpg_np_child_list,
	&tpg_np_parent->tpg_np_parent_list);
	spin_unlock(&tpg_np_parent->tpg_np_parent_lock);
	}

	pr_debug("CORE[%s] - Added Network Portal: %s:%hu,%hu on %s\n",
	tpg->tpg_tiqn->tiqn, np->np_ip, np->np_port, tpg->tpgt,
	(np->np_network_transport == ISCSI_TCP) ? "TCP" : "SCTP");

	return tpg_np;
	}

	static int iscsit_tpg_release_np(
	struct iscsi_tpg_np *tpg_np,
	struct iscsi_portal_group *tpg,
	struct iscsi_np *np)
	{
	iscsit_clear_tpg_np_login_thread(tpg_np, tpg);

	pr_debug("CORE[%s] - Removed Network Portal: %s:%hu,%hu on %s\n",
	tpg->tpg_tiqn->tiqn, np->np_ip, np->np_port, tpg->tpgt,
	(np->np_network_transport == ISCSI_TCP) ? "TCP" : "SCTP");

	tpg_np->tpg_np = NULL;
	tpg_np->tpg = NULL;
	kfree(tpg_np);
	/*
	* iscsit_del_np() will shutdown struct iscsi_np when last TPG reference is released.
	*/
	return iscsit_del_np(np);
	}

	int iscsit_tpg_del_network_portal(
	struct iscsi_portal_group *tpg,
	struct iscsi_tpg_np *tpg_np)
	{
	struct iscsi_np *np;
	struct iscsi_tpg_np tpg_np_child, tpg_np_child_tmp;
	int ret = 0;

	np = tpg_np->tpg_np;
	if (!np) {
	pr_err("Unable to locate struct iscsi_np from"
	" struct iscsi_tpg_np\n");
	return -EINVAL;
	}

	if (!tpg_np->tpg_np_parent) {
	/*
	* We are the parent tpg network portal. Release all of the
	* child tpg_np's (eg: the non ISCSI_TCP ones) on our parent
	* list first.
	*/
	list_for_each_entry_safe(tpg_np_child, tpg_np_child_tmp,
	&tpg_np->tpg_np_parent_list,
	tpg_np_child_list) {
	ret = iscsit_tpg_del_network_portal(tpg, tpg_np_child);
	if (ret < 0)
	pr_err("iscsit_tpg_del_network_portal()"
	" failed: %d\n", ret);
	}
	} else {
	/*
	* We are not the parent ISCSI_TCP tpg network portal. Release
	* our own network portals from the child list.
	*/
	spin_lock(&tpg_np->tpg_np_parent->tpg_np_parent_lock);
	list_del(&tpg_np->tpg_np_child_list);
	spin_unlock(&tpg_np->tpg_np_parent->tpg_np_parent_lock);
	}

	spin_lock(&tpg->tpg_np_lock);
	list_del(&tpg_np->tpg_np_list);
	tpg->num_tpg_nps--;
	if (tpg->tpg_tiqn)
	tpg->tpg_tiqn->tiqn_num_tpg_nps--;
	spin_unlock(&tpg->tpg_np_lock);

	return iscsit_tpg_release_np(tpg_np, tpg, np);
	}

	int iscsit_tpg_set_initiator_node_queue_depth(
	struct iscsi_portal_group *tpg,
	unsigned char *initiatorname,
	u32 queue_depth,
	int force)
	{
	return core_tpg_set_initiator_node_queue_depth(&tpg->tpg_se_tpg,
	initiatorname, queue_depth, force);
	}

	int iscsit_ta_authentication(struct iscsi_portal_group *tpg, u32 authentication)
	{
	unsigned char buf1[256], buf2[256], *none = NULL;
	int len;
	struct iscsi_param *param;
	struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

	if ((authentication != 1) && (authentication != 0)) {
	pr_err("Illegal value for authentication parameter:"
	" %u, ignoring request.\n", authentication);
	return -EINVAL;
	}

	memset(buf1, 0, sizeof(buf1));
	memset(buf2, 0, sizeof(buf2));

	param = iscsi_find_param_from_key(AUTHMETHOD, tpg->param_list);
	if (!param)
	return -EINVAL;

	if (authentication) {
	snprintf(buf1, sizeof(buf1), "%s", param->value);
	none = strstr(buf1, NONE);
	if (!none)
	goto out;
	if (!strncmp(none + 4, ",", 1)) {
	if (!strcmp(buf1, none))
	sprintf(buf2, "%s", none+5);
	else {
	none--;
	*none = '\0';
	len = sprintf(buf2, "%s", buf1);
	none += 5;
	sprintf(buf2 + len, "%s", none);
	}
	} else {
	none--;
	*none = '\0';
	sprintf(buf2, "%s", buf1);
	}
	if (iscsi_update_param_value(param, buf2) < 0)
	return -EINVAL;
	} else {
	snprintf(buf1, sizeof(buf1), "%s", param->value);
	none = strstr(buf1, NONE);
	if (none)
	goto out;
	strncat(buf1, ",", strlen(","));
	strncat(buf1, NONE, strlen(NONE));
	if (iscsi_update_param_value(param, buf1) < 0)
	return -EINVAL;
	}

	out:
	a->authentication = authentication;
	pr_debug("%s iSCSI Authentication Methods for TPG: %hu.\n",
	a->authentication ? "Enforcing" : "Disabling", tpg->tpgt);

	return 0;
	}

	int iscsit_ta_login_timeout(
	struct iscsi_portal_group *tpg,
	u32 login_timeout)
	{
	struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

	if (login_timeout > TA_LOGIN_TIMEOUT_MAX) {
	pr_err("Requested Login Timeout %u larger than maximum"
	" %u\n", login_timeout, TA_LOGIN_TIMEOUT_MAX);
	return -EINVAL;
	} else if (login_timeout < TA_LOGIN_TIMEOUT_MIN) {
	pr_err("Requested Logout Timeout %u smaller than"
	" minimum %u\n", login_timeout, TA_LOGIN_TIMEOUT_MIN);
	return -EINVAL;
	}

	a->login_timeout = login_timeout;
	pr_debug("Set Logout Timeout to %u for Target Portal Group"
	" %hu\n", a->login_timeout, tpg->tpgt);

	return 0;
	}

	int iscsit_ta_netif_timeout(
	struct iscsi_portal_group *tpg,
	u32 netif_timeout)
	{
	struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

	if (netif_timeout > TA_NETIF_TIMEOUT_MAX) {
	pr_err("Requested Network Interface Timeout %u larger"
	" than maximum %u\n", netif_timeout,
	TA_NETIF_TIMEOUT_MAX);
	return -EINVAL;
	} else if (netif_timeout < TA_NETIF_TIMEOUT_MIN) {
	pr_err("Requested Network Interface Timeout %u smaller"
	" than minimum %u\n", netif_timeout,
	TA_NETIF_TIMEOUT_MIN);
	return -EINVAL;
	}

	a->netif_timeout = netif_timeout;
	pr_debug("Set Network Interface Timeout to %u for"
	" Target Portal Group %hu\n", a->netif_timeout, tpg->tpgt);

	return 0;
	}

	int iscsit_ta_generate_node_acls(
	struct iscsi_portal_group *tpg,
	u32 flag)
	{
	struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

	if ((flag != 0) && (flag != 1)) {
	pr_err("Illegal value %d\n", flag);
	return -EINVAL;
	}

	a->generate_node_acls = flag;
	pr_debug("iSCSI_TPG[%hu] - Generate Initiator Portal Group ACLs: %s\n",
	tpg->tpgt, (a->generate_node_acls) ? "Enabled" : "Disabled");

	return 0;
	}

	int iscsit_ta_default_cmdsn_depth(
	struct iscsi_portal_group *tpg,
	u32 tcq_depth)
	{
	struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

	if (tcq_depth > TA_DEFAULT_CMDSN_DEPTH_MAX) {
	pr_err("Requested Default Queue Depth: %u larger"
	" than maximum %u\n", tcq_depth,
	TA_DEFAULT_CMDSN_DEPTH_MAX);
	return -EINVAL;
	} else if (tcq_depth < TA_DEFAULT_CMDSN_DEPTH_MIN) {
	pr_err("Requested Default Queue Depth: %u smaller"
	" than minimum %u\n", tcq_depth,
	TA_DEFAULT_CMDSN_DEPTH_MIN);
	return -EINVAL;
	}

	a->default_cmdsn_depth = tcq_depth;
	pr_debug("iSCSI_TPG[%hu] - Set Default CmdSN TCQ Depth to %u\n",
	tpg->tpgt, a->default_cmdsn_depth);

	return 0;
	}

	int iscsit_ta_cache_dynamic_acls(
	struct iscsi_portal_group *tpg,
	u32 flag)
	{
	struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

	if ((flag != 0) && (flag != 1)) {
	pr_err("Illegal value %d\n", flag);
	return -EINVAL;
	}

	a->cache_dynamic_acls = flag;
	pr_debug("iSCSI_TPG[%hu] - Cache Dynamic Initiator Portal Group"
	" ACLs %s\n", tpg->tpgt, (a->cache_dynamic_acls) ?
	"Enabled" : "Disabled");

	return 0;
	}

	int iscsit_ta_demo_mode_write_protect(
	struct iscsi_portal_group *tpg,
	u32 flag)
	{
	struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

	if ((flag != 0) && (flag != 1)) {
	pr_err("Illegal value %d\n", flag);
	return -EINVAL;
	}

	a->demo_mode_write_protect = flag;
	pr_debug("iSCSI_TPG[%hu] - Demo Mode Write Protect bit: %s\n",
	tpg->tpgt, (a->demo_mode_write_protect) ? "ON" : "OFF");

	return 0;
	}

	int iscsit_ta_prod_mode_write_protect(
	struct iscsi_portal_group *tpg,
	u32 flag)
	{
	struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;

	if ((flag != 0) && (flag != 1)) {
	pr_err("Illegal value %d\n", flag);
	return -EINVAL;
	}

	a->prod_mode_write_protect = flag;
	pr_debug("iSCSI_TPG[%hu] - Production Mode Write Protect bit:"
	" %s\n", tpg->tpgt, (a->prod_mode_write_protect) ?
	"ON" : "OFF");

	return 0;
	}