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1461 lines
39 KiB
1461 lines
39 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/******************************************************************************* |
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* This file contains the login functions used by the iSCSI Target driver. |
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* |
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* (c) Copyright 2007-2013 Datera, Inc. |
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* |
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* Author: Nicholas A. Bellinger <[email protected]> |
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* |
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******************************************************************************/ |
|
|
|
#include <crypto/hash.h> |
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#include <linux/module.h> |
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#include <linux/string.h> |
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#include <linux/kthread.h> |
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#include <linux/sched/signal.h> |
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#include <linux/idr.h> |
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#include <linux/tcp.h> /* TCP_NODELAY */ |
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#include <net/ip.h> |
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#include <net/ipv6.h> /* ipv6_addr_v4mapped() */ |
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#include <scsi/iscsi_proto.h> |
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#include <target/target_core_base.h> |
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#include <target/target_core_fabric.h> |
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|
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#include <target/iscsi/iscsi_target_core.h> |
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#include <target/iscsi/iscsi_target_stat.h> |
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#include "iscsi_target_device.h" |
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#include "iscsi_target_nego.h" |
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#include "iscsi_target_erl0.h" |
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#include "iscsi_target_erl2.h" |
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#include "iscsi_target_login.h" |
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#include "iscsi_target_tpg.h" |
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#include "iscsi_target_util.h" |
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#include "iscsi_target.h" |
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#include "iscsi_target_parameters.h" |
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|
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#include <target/iscsi/iscsi_transport.h> |
|
|
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static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn) |
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{ |
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struct iscsi_login *login; |
|
|
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login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL); |
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if (!login) { |
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pr_err("Unable to allocate memory for struct iscsi_login.\n"); |
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return NULL; |
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} |
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conn->login = login; |
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login->conn = conn; |
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login->first_request = 1; |
|
|
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login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL); |
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if (!login->req_buf) { |
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pr_err("Unable to allocate memory for response buffer.\n"); |
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goto out_login; |
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} |
|
|
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login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL); |
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if (!login->rsp_buf) { |
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pr_err("Unable to allocate memory for request buffer.\n"); |
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goto out_req_buf; |
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} |
|
|
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conn->conn_login = login; |
|
|
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return login; |
|
|
|
out_req_buf: |
|
kfree(login->req_buf); |
|
out_login: |
|
kfree(login); |
|
return NULL; |
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} |
|
|
|
/* |
|
* Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup |
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* per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel |
|
*/ |
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int iscsi_login_setup_crypto(struct iscsi_conn *conn) |
|
{ |
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struct crypto_ahash *tfm; |
|
|
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/* |
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* Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts |
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* which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback |
|
* to software 1x8 byte slicing from crc32c.ko |
|
*/ |
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tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC); |
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if (IS_ERR(tfm)) { |
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pr_err("crypto_alloc_ahash() failed\n"); |
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return -ENOMEM; |
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} |
|
|
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conn->conn_rx_hash = ahash_request_alloc(tfm, GFP_KERNEL); |
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if (!conn->conn_rx_hash) { |
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pr_err("ahash_request_alloc() failed for conn_rx_hash\n"); |
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crypto_free_ahash(tfm); |
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return -ENOMEM; |
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} |
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ahash_request_set_callback(conn->conn_rx_hash, 0, NULL, NULL); |
|
|
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conn->conn_tx_hash = ahash_request_alloc(tfm, GFP_KERNEL); |
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if (!conn->conn_tx_hash) { |
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pr_err("ahash_request_alloc() failed for conn_tx_hash\n"); |
|
ahash_request_free(conn->conn_rx_hash); |
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conn->conn_rx_hash = NULL; |
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crypto_free_ahash(tfm); |
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return -ENOMEM; |
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} |
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ahash_request_set_callback(conn->conn_tx_hash, 0, NULL, NULL); |
|
|
|
return 0; |
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} |
|
|
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static int iscsi_login_check_initiator_version( |
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struct iscsi_conn *conn, |
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u8 version_max, |
|
u8 version_min) |
|
{ |
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if ((version_max != 0x00) || (version_min != 0x00)) { |
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pr_err("Unsupported iSCSI IETF Pre-RFC Revision," |
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" version Min/Max 0x%02x/0x%02x, rejecting login.\n", |
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version_min, version_max); |
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iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, |
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ISCSI_LOGIN_STATUS_NO_VERSION); |
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return -1; |
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} |
|
|
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return 0; |
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} |
|
|
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int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn) |
|
{ |
|
int sessiontype; |
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struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL; |
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struct iscsi_portal_group *tpg = conn->tpg; |
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struct iscsi_session *sess = NULL, *sess_p = NULL; |
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struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; |
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struct se_session *se_sess, *se_sess_tmp; |
|
|
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initiatorname_param = iscsi_find_param_from_key( |
|
INITIATORNAME, conn->param_list); |
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sessiontype_param = iscsi_find_param_from_key( |
|
SESSIONTYPE, conn->param_list); |
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if (!initiatorname_param || !sessiontype_param) { |
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, |
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ISCSI_LOGIN_STATUS_MISSING_FIELDS); |
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return -1; |
|
} |
|
|
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sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0; |
|
|
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spin_lock_bh(&se_tpg->session_lock); |
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list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, |
|
sess_list) { |
|
|
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sess_p = se_sess->fabric_sess_ptr; |
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spin_lock(&sess_p->conn_lock); |
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if (atomic_read(&sess_p->session_fall_back_to_erl0) || |
|
atomic_read(&sess_p->session_logout) || |
|
atomic_read(&sess_p->session_close) || |
|
(sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { |
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spin_unlock(&sess_p->conn_lock); |
|
continue; |
|
} |
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if (!memcmp(sess_p->isid, conn->sess->isid, 6) && |
|
(!strcmp(sess_p->sess_ops->InitiatorName, |
|
initiatorname_param->value) && |
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(sess_p->sess_ops->SessionType == sessiontype))) { |
|
atomic_set(&sess_p->session_reinstatement, 1); |
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atomic_set(&sess_p->session_fall_back_to_erl0, 1); |
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atomic_set(&sess_p->session_close, 1); |
|
spin_unlock(&sess_p->conn_lock); |
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iscsit_inc_session_usage_count(sess_p); |
|
iscsit_stop_time2retain_timer(sess_p); |
|
sess = sess_p; |
|
break; |
|
} |
|
spin_unlock(&sess_p->conn_lock); |
|
} |
|
spin_unlock_bh(&se_tpg->session_lock); |
|
/* |
|
* If the Time2Retain handler has expired, the session is already gone. |
|
*/ |
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if (!sess) |
|
return 0; |
|
|
|
pr_debug("%s iSCSI Session SID %u is still active for %s," |
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" performing session reinstatement.\n", (sessiontype) ? |
|
"Discovery" : "Normal", sess->sid, |
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sess->sess_ops->InitiatorName); |
|
|
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spin_lock_bh(&sess->conn_lock); |
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if (sess->session_state == TARG_SESS_STATE_FAILED) { |
|
spin_unlock_bh(&sess->conn_lock); |
|
iscsit_dec_session_usage_count(sess); |
|
return 0; |
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} |
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spin_unlock_bh(&sess->conn_lock); |
|
|
|
iscsit_stop_session(sess, 1, 1); |
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iscsit_dec_session_usage_count(sess); |
|
|
|
return 0; |
|
} |
|
|
|
static int iscsi_login_set_conn_values( |
|
struct iscsi_session *sess, |
|
struct iscsi_conn *conn, |
|
__be16 cid) |
|
{ |
|
int ret; |
|
conn->sess = sess; |
|
conn->cid = be16_to_cpu(cid); |
|
/* |
|
* Generate a random Status sequence number (statsn) for the new |
|
* iSCSI connection. |
|
*/ |
|
ret = get_random_bytes_wait(&conn->stat_sn, sizeof(u32)); |
|
if (unlikely(ret)) |
|
return ret; |
|
|
|
mutex_lock(&auth_id_lock); |
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conn->auth_id = iscsit_global->auth_id++; |
|
mutex_unlock(&auth_id_lock); |
|
return 0; |
|
} |
|
|
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__printf(2, 3) int iscsi_change_param_sprintf( |
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struct iscsi_conn *conn, |
|
const char *fmt, ...) |
|
{ |
|
va_list args; |
|
unsigned char buf[64]; |
|
|
|
memset(buf, 0, sizeof buf); |
|
|
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va_start(args, fmt); |
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vsnprintf(buf, sizeof buf, fmt, args); |
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va_end(args); |
|
|
|
if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) { |
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iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, |
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ISCSI_LOGIN_STATUS_NO_RESOURCES); |
|
return -1; |
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} |
|
|
|
return 0; |
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} |
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EXPORT_SYMBOL(iscsi_change_param_sprintf); |
|
|
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/* |
|
* This is the leading connection of a new session, |
|
* or session reinstatement. |
|
*/ |
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static int iscsi_login_zero_tsih_s1( |
|
struct iscsi_conn *conn, |
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unsigned char *buf) |
|
{ |
|
struct iscsi_session *sess = NULL; |
|
struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf; |
|
int ret; |
|
|
|
sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL); |
|
if (!sess) { |
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, |
|
ISCSI_LOGIN_STATUS_NO_RESOURCES); |
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pr_err("Could not allocate memory for session\n"); |
|
return -ENOMEM; |
|
} |
|
|
|
if (iscsi_login_set_conn_values(sess, conn, pdu->cid)) |
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goto free_sess; |
|
|
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sess->init_task_tag = pdu->itt; |
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memcpy(&sess->isid, pdu->isid, 6); |
|
sess->exp_cmd_sn = be32_to_cpu(pdu->cmdsn); |
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INIT_LIST_HEAD(&sess->sess_conn_list); |
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INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list); |
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INIT_LIST_HEAD(&sess->cr_active_list); |
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INIT_LIST_HEAD(&sess->cr_inactive_list); |
|
init_completion(&sess->async_msg_comp); |
|
init_completion(&sess->reinstatement_comp); |
|
init_completion(&sess->session_wait_comp); |
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init_completion(&sess->session_waiting_on_uc_comp); |
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mutex_init(&sess->cmdsn_mutex); |
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spin_lock_init(&sess->conn_lock); |
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spin_lock_init(&sess->cr_a_lock); |
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spin_lock_init(&sess->cr_i_lock); |
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spin_lock_init(&sess->session_usage_lock); |
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spin_lock_init(&sess->ttt_lock); |
|
|
|
timer_setup(&sess->time2retain_timer, |
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iscsit_handle_time2retain_timeout, 0); |
|
|
|
ret = ida_alloc(&sess_ida, GFP_KERNEL); |
|
if (ret < 0) { |
|
pr_err("Session ID allocation failed %d\n", ret); |
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iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, |
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ISCSI_LOGIN_STATUS_NO_RESOURCES); |
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goto free_sess; |
|
} |
|
|
|
sess->session_index = ret; |
|
sess->creation_time = get_jiffies_64(); |
|
/* |
|
* The FFP CmdSN window values will be allocated from the TPG's |
|
* Initiator Node's ACL once the login has been successfully completed. |
|
*/ |
|
atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn)); |
|
|
|
sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL); |
|
if (!sess->sess_ops) { |
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, |
|
ISCSI_LOGIN_STATUS_NO_RESOURCES); |
|
pr_err("Unable to allocate memory for" |
|
" struct iscsi_sess_ops.\n"); |
|
goto free_id; |
|
} |
|
|
|
sess->se_sess = transport_alloc_session(TARGET_PROT_NORMAL); |
|
if (IS_ERR(sess->se_sess)) { |
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, |
|
ISCSI_LOGIN_STATUS_NO_RESOURCES); |
|
goto free_ops; |
|
} |
|
|
|
return 0; |
|
|
|
free_ops: |
|
kfree(sess->sess_ops); |
|
free_id: |
|
ida_free(&sess_ida, sess->session_index); |
|
free_sess: |
|
kfree(sess); |
|
conn->sess = NULL; |
|
return -ENOMEM; |
|
} |
|
|
|
static int iscsi_login_zero_tsih_s2( |
|
struct iscsi_conn *conn) |
|
{ |
|
struct iscsi_node_attrib *na; |
|
struct iscsi_session *sess = conn->sess; |
|
bool iser = false; |
|
|
|
sess->tpg = conn->tpg; |
|
|
|
/* |
|
* Assign a new TPG Session Handle. Note this is protected with |
|
* struct iscsi_portal_group->np_login_sem from iscsit_access_np(). |
|
*/ |
|
sess->tsih = ++sess->tpg->ntsih; |
|
if (!sess->tsih) |
|
sess->tsih = ++sess->tpg->ntsih; |
|
|
|
/* |
|
* Create the default params from user defined values.. |
|
*/ |
|
if (iscsi_copy_param_list(&conn->param_list, |
|
conn->tpg->param_list, 1) < 0) { |
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, |
|
ISCSI_LOGIN_STATUS_NO_RESOURCES); |
|
return -1; |
|
} |
|
|
|
if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) |
|
iser = true; |
|
|
|
iscsi_set_keys_to_negotiate(conn->param_list, iser); |
|
|
|
if (sess->sess_ops->SessionType) |
|
return iscsi_set_keys_irrelevant_for_discovery( |
|
conn->param_list); |
|
|
|
na = iscsit_tpg_get_node_attrib(sess); |
|
|
|
/* |
|
* Need to send TargetPortalGroupTag back in first login response |
|
* on any iSCSI connection where the Initiator provides TargetName. |
|
* See 5.3.1. Login Phase Start |
|
* |
|
* In our case, we have already located the struct iscsi_tiqn at this point. |
|
*/ |
|
if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt)) |
|
return -1; |
|
|
|
/* |
|
* Workaround for Initiators that have broken connection recovery logic. |
|
* |
|
* "We would really like to get rid of this." Linux-iSCSI.org team |
|
*/ |
|
if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl)) |
|
return -1; |
|
|
|
/* |
|
* Set RDMAExtensions=Yes by default for iSER enabled network portals |
|
*/ |
|
if (iser) { |
|
struct iscsi_param *param; |
|
unsigned long mrdsl, off; |
|
int rc; |
|
|
|
if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes")) |
|
return -1; |
|
|
|
/* |
|
* Make MaxRecvDataSegmentLength PAGE_SIZE aligned for |
|
* Immediate Data + Unsolicited Data-OUT if necessary.. |
|
*/ |
|
param = iscsi_find_param_from_key("MaxRecvDataSegmentLength", |
|
conn->param_list); |
|
if (!param) { |
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, |
|
ISCSI_LOGIN_STATUS_NO_RESOURCES); |
|
return -1; |
|
} |
|
rc = kstrtoul(param->value, 0, &mrdsl); |
|
if (rc < 0) { |
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, |
|
ISCSI_LOGIN_STATUS_NO_RESOURCES); |
|
return -1; |
|
} |
|
off = mrdsl % PAGE_SIZE; |
|
if (!off) |
|
goto check_prot; |
|
|
|
if (mrdsl < PAGE_SIZE) |
|
mrdsl = PAGE_SIZE; |
|
else |
|
mrdsl -= off; |
|
|
|
pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down" |
|
" to PAGE_SIZE\n", mrdsl); |
|
|
|
if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl)) |
|
return -1; |
|
/* |
|
* ISER currently requires that ImmediateData + Unsolicited |
|
* Data be disabled when protection / signature MRs are enabled. |
|
*/ |
|
check_prot: |
|
if (sess->se_sess->sup_prot_ops & |
|
(TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS | |
|
TARGET_PROT_DOUT_INSERT)) { |
|
|
|
if (iscsi_change_param_sprintf(conn, "ImmediateData=No")) |
|
return -1; |
|
|
|
if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes")) |
|
return -1; |
|
|
|
pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for" |
|
" T10-PI enabled ISER session\n"); |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int iscsi_login_non_zero_tsih_s1( |
|
struct iscsi_conn *conn, |
|
unsigned char *buf) |
|
{ |
|
struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf; |
|
|
|
return iscsi_login_set_conn_values(NULL, conn, pdu->cid); |
|
} |
|
|
|
/* |
|
* Add a new connection to an existing session. |
|
*/ |
|
static int iscsi_login_non_zero_tsih_s2( |
|
struct iscsi_conn *conn, |
|
unsigned char *buf) |
|
{ |
|
struct iscsi_portal_group *tpg = conn->tpg; |
|
struct iscsi_session *sess = NULL, *sess_p = NULL; |
|
struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; |
|
struct se_session *se_sess, *se_sess_tmp; |
|
struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf; |
|
bool iser = false; |
|
|
|
spin_lock_bh(&se_tpg->session_lock); |
|
list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, |
|
sess_list) { |
|
|
|
sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr; |
|
if (atomic_read(&sess_p->session_fall_back_to_erl0) || |
|
atomic_read(&sess_p->session_logout) || |
|
atomic_read(&sess_p->session_close) || |
|
(sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) |
|
continue; |
|
if (!memcmp(sess_p->isid, pdu->isid, 6) && |
|
(sess_p->tsih == be16_to_cpu(pdu->tsih))) { |
|
iscsit_inc_session_usage_count(sess_p); |
|
iscsit_stop_time2retain_timer(sess_p); |
|
sess = sess_p; |
|
break; |
|
} |
|
} |
|
spin_unlock_bh(&se_tpg->session_lock); |
|
|
|
/* |
|
* If the Time2Retain handler has expired, the session is already gone. |
|
*/ |
|
if (!sess) { |
|
pr_err("Initiator attempting to add a connection to" |
|
" a non-existent session, rejecting iSCSI Login.\n"); |
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, |
|
ISCSI_LOGIN_STATUS_NO_SESSION); |
|
return -1; |
|
} |
|
|
|
/* |
|
* Stop the Time2Retain timer if this is a failed session, we restart |
|
* the timer if the login is not successful. |
|
*/ |
|
spin_lock_bh(&sess->conn_lock); |
|
if (sess->session_state == TARG_SESS_STATE_FAILED) |
|
atomic_set(&sess->session_continuation, 1); |
|
spin_unlock_bh(&sess->conn_lock); |
|
|
|
if (iscsi_login_set_conn_values(sess, conn, pdu->cid) < 0 || |
|
iscsi_copy_param_list(&conn->param_list, |
|
conn->tpg->param_list, 0) < 0) { |
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, |
|
ISCSI_LOGIN_STATUS_NO_RESOURCES); |
|
return -1; |
|
} |
|
|
|
if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) |
|
iser = true; |
|
|
|
iscsi_set_keys_to_negotiate(conn->param_list, iser); |
|
/* |
|
* Need to send TargetPortalGroupTag back in first login response |
|
* on any iSCSI connection where the Initiator provides TargetName. |
|
* See 5.3.1. Login Phase Start |
|
* |
|
* In our case, we have already located the struct iscsi_tiqn at this point. |
|
*/ |
|
if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt)) |
|
return -1; |
|
|
|
return 0; |
|
} |
|
|
|
int iscsi_login_post_auth_non_zero_tsih( |
|
struct iscsi_conn *conn, |
|
u16 cid, |
|
u32 exp_statsn) |
|
{ |
|
struct iscsi_conn *conn_ptr = NULL; |
|
struct iscsi_conn_recovery *cr = NULL; |
|
struct iscsi_session *sess = conn->sess; |
|
|
|
/* |
|
* By following item 5 in the login table, if we have found |
|
* an existing ISID and a valid/existing TSIH and an existing |
|
* CID we do connection reinstatement. Currently we dont not |
|
* support it so we send back an non-zero status class to the |
|
* initiator and release the new connection. |
|
*/ |
|
conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid); |
|
if (conn_ptr) { |
|
pr_err("Connection exists with CID %hu for %s," |
|
" performing connection reinstatement.\n", |
|
conn_ptr->cid, sess->sess_ops->InitiatorName); |
|
|
|
iscsit_connection_reinstatement_rcfr(conn_ptr); |
|
iscsit_dec_conn_usage_count(conn_ptr); |
|
} |
|
|
|
/* |
|
* Check for any connection recovery entries containing CID. |
|
* We use the original ExpStatSN sent in the first login request |
|
* to acknowledge commands for the failed connection. |
|
* |
|
* Also note that an explict logout may have already been sent, |
|
* but the response may not be sent due to additional connection |
|
* loss. |
|
*/ |
|
if (sess->sess_ops->ErrorRecoveryLevel == 2) { |
|
cr = iscsit_get_inactive_connection_recovery_entry( |
|
sess, cid); |
|
if (cr) { |
|
pr_debug("Performing implicit logout" |
|
" for connection recovery on CID: %hu\n", |
|
conn->cid); |
|
iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn); |
|
} |
|
} |
|
|
|
/* |
|
* Else we follow item 4 from the login table in that we have |
|
* found an existing ISID and a valid/existing TSIH and a new |
|
* CID we go ahead and continue to add a new connection to the |
|
* session. |
|
*/ |
|
pr_debug("Adding CID %hu to existing session for %s.\n", |
|
cid, sess->sess_ops->InitiatorName); |
|
|
|
if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) { |
|
pr_err("Adding additional connection to this session" |
|
" would exceed MaxConnections %d, login failed.\n", |
|
sess->sess_ops->MaxConnections); |
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, |
|
ISCSI_LOGIN_STATUS_ISID_ERROR); |
|
return -1; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void iscsi_post_login_start_timers(struct iscsi_conn *conn) |
|
{ |
|
struct iscsi_session *sess = conn->sess; |
|
/* |
|
* FIXME: Unsolicited NopIN support for ISER |
|
*/ |
|
if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) |
|
return; |
|
|
|
if (!sess->sess_ops->SessionType) |
|
iscsit_start_nopin_timer(conn); |
|
} |
|
|
|
int iscsit_start_kthreads(struct iscsi_conn *conn) |
|
{ |
|
int ret = 0; |
|
|
|
spin_lock(&iscsit_global->ts_bitmap_lock); |
|
conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap, |
|
ISCSIT_BITMAP_BITS, get_order(1)); |
|
spin_unlock(&iscsit_global->ts_bitmap_lock); |
|
|
|
if (conn->bitmap_id < 0) { |
|
pr_err("bitmap_find_free_region() failed for" |
|
" iscsit_start_kthreads()\n"); |
|
return -ENOMEM; |
|
} |
|
|
|
conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn, |
|
"%s", ISCSI_TX_THREAD_NAME); |
|
if (IS_ERR(conn->tx_thread)) { |
|
pr_err("Unable to start iscsi_target_tx_thread\n"); |
|
ret = PTR_ERR(conn->tx_thread); |
|
goto out_bitmap; |
|
} |
|
conn->tx_thread_active = true; |
|
|
|
conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn, |
|
"%s", ISCSI_RX_THREAD_NAME); |
|
if (IS_ERR(conn->rx_thread)) { |
|
pr_err("Unable to start iscsi_target_rx_thread\n"); |
|
ret = PTR_ERR(conn->rx_thread); |
|
goto out_tx; |
|
} |
|
conn->rx_thread_active = true; |
|
|
|
return 0; |
|
out_tx: |
|
send_sig(SIGINT, conn->tx_thread, 1); |
|
kthread_stop(conn->tx_thread); |
|
conn->tx_thread_active = false; |
|
out_bitmap: |
|
spin_lock(&iscsit_global->ts_bitmap_lock); |
|
bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, |
|
get_order(1)); |
|
spin_unlock(&iscsit_global->ts_bitmap_lock); |
|
return ret; |
|
} |
|
|
|
void iscsi_post_login_handler( |
|
struct iscsi_np *np, |
|
struct iscsi_conn *conn, |
|
u8 zero_tsih) |
|
{ |
|
int stop_timer = 0; |
|
struct iscsi_session *sess = conn->sess; |
|
struct se_session *se_sess = sess->se_sess; |
|
struct iscsi_portal_group *tpg = sess->tpg; |
|
struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; |
|
|
|
iscsit_inc_conn_usage_count(conn); |
|
|
|
iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS, |
|
ISCSI_LOGIN_STATUS_ACCEPT); |
|
|
|
pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n"); |
|
conn->conn_state = TARG_CONN_STATE_LOGGED_IN; |
|
|
|
iscsi_set_connection_parameters(conn->conn_ops, conn->param_list); |
|
/* |
|
* SCSI Initiator -> SCSI Target Port Mapping |
|
*/ |
|
if (!zero_tsih) { |
|
iscsi_set_session_parameters(sess->sess_ops, |
|
conn->param_list, 0); |
|
iscsi_release_param_list(conn->param_list); |
|
conn->param_list = NULL; |
|
|
|
spin_lock_bh(&sess->conn_lock); |
|
atomic_set(&sess->session_continuation, 0); |
|
if (sess->session_state == TARG_SESS_STATE_FAILED) { |
|
pr_debug("Moving to" |
|
" TARG_SESS_STATE_LOGGED_IN.\n"); |
|
sess->session_state = TARG_SESS_STATE_LOGGED_IN; |
|
stop_timer = 1; |
|
} |
|
|
|
pr_debug("iSCSI Login successful on CID: %hu from %pISpc to" |
|
" %pISpc,%hu\n", conn->cid, &conn->login_sockaddr, |
|
&conn->local_sockaddr, tpg->tpgt); |
|
|
|
list_add_tail(&conn->conn_list, &sess->sess_conn_list); |
|
atomic_inc(&sess->nconn); |
|
pr_debug("Incremented iSCSI Connection count to %hu" |
|
" from node: %s\n", atomic_read(&sess->nconn), |
|
sess->sess_ops->InitiatorName); |
|
spin_unlock_bh(&sess->conn_lock); |
|
|
|
iscsi_post_login_start_timers(conn); |
|
/* |
|
* Determine CPU mask to ensure connection's RX and TX kthreads |
|
* are scheduled on the same CPU. |
|
*/ |
|
iscsit_thread_get_cpumask(conn); |
|
conn->conn_rx_reset_cpumask = 1; |
|
conn->conn_tx_reset_cpumask = 1; |
|
/* |
|
* Wakeup the sleeping iscsi_target_rx_thread() now that |
|
* iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state. |
|
*/ |
|
complete(&conn->rx_login_comp); |
|
iscsit_dec_conn_usage_count(conn); |
|
|
|
if (stop_timer) { |
|
spin_lock_bh(&se_tpg->session_lock); |
|
iscsit_stop_time2retain_timer(sess); |
|
spin_unlock_bh(&se_tpg->session_lock); |
|
} |
|
iscsit_dec_session_usage_count(sess); |
|
return; |
|
} |
|
|
|
iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1); |
|
iscsi_release_param_list(conn->param_list); |
|
conn->param_list = NULL; |
|
|
|
iscsit_determine_maxcmdsn(sess); |
|
|
|
spin_lock_bh(&se_tpg->session_lock); |
|
__transport_register_session(&sess->tpg->tpg_se_tpg, |
|
se_sess->se_node_acl, se_sess, sess); |
|
pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n"); |
|
sess->session_state = TARG_SESS_STATE_LOGGED_IN; |
|
|
|
pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n", |
|
conn->cid, &conn->login_sockaddr, &conn->local_sockaddr, |
|
tpg->tpgt); |
|
|
|
spin_lock_bh(&sess->conn_lock); |
|
list_add_tail(&conn->conn_list, &sess->sess_conn_list); |
|
atomic_inc(&sess->nconn); |
|
pr_debug("Incremented iSCSI Connection count to %hu from node:" |
|
" %s\n", atomic_read(&sess->nconn), |
|
sess->sess_ops->InitiatorName); |
|
spin_unlock_bh(&sess->conn_lock); |
|
|
|
sess->sid = tpg->sid++; |
|
if (!sess->sid) |
|
sess->sid = tpg->sid++; |
|
pr_debug("Established iSCSI session from node: %s\n", |
|
sess->sess_ops->InitiatorName); |
|
|
|
tpg->nsessions++; |
|
if (tpg->tpg_tiqn) |
|
tpg->tpg_tiqn->tiqn_nsessions++; |
|
|
|
pr_debug("Incremented number of active iSCSI sessions to %u on" |
|
" iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt); |
|
spin_unlock_bh(&se_tpg->session_lock); |
|
|
|
iscsi_post_login_start_timers(conn); |
|
/* |
|
* Determine CPU mask to ensure connection's RX and TX kthreads |
|
* are scheduled on the same CPU. |
|
*/ |
|
iscsit_thread_get_cpumask(conn); |
|
conn->conn_rx_reset_cpumask = 1; |
|
conn->conn_tx_reset_cpumask = 1; |
|
/* |
|
* Wakeup the sleeping iscsi_target_rx_thread() now that |
|
* iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state. |
|
*/ |
|
complete(&conn->rx_login_comp); |
|
iscsit_dec_conn_usage_count(conn); |
|
} |
|
|
|
void iscsi_handle_login_thread_timeout(struct timer_list *t) |
|
{ |
|
struct iscsi_np *np = from_timer(np, t, np_login_timer); |
|
|
|
spin_lock_bh(&np->np_thread_lock); |
|
pr_err("iSCSI Login timeout on Network Portal %pISpc\n", |
|
&np->np_sockaddr); |
|
|
|
if (np->np_login_timer_flags & ISCSI_TF_STOP) { |
|
spin_unlock_bh(&np->np_thread_lock); |
|
return; |
|
} |
|
|
|
if (np->np_thread) |
|
send_sig(SIGINT, np->np_thread, 1); |
|
|
|
np->np_login_timer_flags &= ~ISCSI_TF_RUNNING; |
|
spin_unlock_bh(&np->np_thread_lock); |
|
} |
|
|
|
static void iscsi_start_login_thread_timer(struct iscsi_np *np) |
|
{ |
|
/* |
|
* This used the TA_LOGIN_TIMEOUT constant because at this |
|
* point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout |
|
*/ |
|
spin_lock_bh(&np->np_thread_lock); |
|
np->np_login_timer_flags &= ~ISCSI_TF_STOP; |
|
np->np_login_timer_flags |= ISCSI_TF_RUNNING; |
|
mod_timer(&np->np_login_timer, jiffies + TA_LOGIN_TIMEOUT * HZ); |
|
|
|
pr_debug("Added timeout timer to iSCSI login request for" |
|
" %u seconds.\n", TA_LOGIN_TIMEOUT); |
|
spin_unlock_bh(&np->np_thread_lock); |
|
} |
|
|
|
static void iscsi_stop_login_thread_timer(struct iscsi_np *np) |
|
{ |
|
spin_lock_bh(&np->np_thread_lock); |
|
if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) { |
|
spin_unlock_bh(&np->np_thread_lock); |
|
return; |
|
} |
|
np->np_login_timer_flags |= ISCSI_TF_STOP; |
|
spin_unlock_bh(&np->np_thread_lock); |
|
|
|
del_timer_sync(&np->np_login_timer); |
|
|
|
spin_lock_bh(&np->np_thread_lock); |
|
np->np_login_timer_flags &= ~ISCSI_TF_RUNNING; |
|
spin_unlock_bh(&np->np_thread_lock); |
|
} |
|
|
|
int iscsit_setup_np( |
|
struct iscsi_np *np, |
|
struct sockaddr_storage *sockaddr) |
|
{ |
|
struct socket *sock = NULL; |
|
int backlog = ISCSIT_TCP_BACKLOG, ret, len; |
|
|
|
switch (np->np_network_transport) { |
|
case ISCSI_TCP: |
|
np->np_ip_proto = IPPROTO_TCP; |
|
np->np_sock_type = SOCK_STREAM; |
|
break; |
|
case ISCSI_SCTP_TCP: |
|
np->np_ip_proto = IPPROTO_SCTP; |
|
np->np_sock_type = SOCK_STREAM; |
|
break; |
|
case ISCSI_SCTP_UDP: |
|
np->np_ip_proto = IPPROTO_SCTP; |
|
np->np_sock_type = SOCK_SEQPACKET; |
|
break; |
|
default: |
|
pr_err("Unsupported network_transport: %d\n", |
|
np->np_network_transport); |
|
return -EINVAL; |
|
} |
|
|
|
ret = sock_create(sockaddr->ss_family, np->np_sock_type, |
|
np->np_ip_proto, &sock); |
|
if (ret < 0) { |
|
pr_err("sock_create() failed.\n"); |
|
return ret; |
|
} |
|
np->np_socket = sock; |
|
/* |
|
* Setup the np->np_sockaddr from the passed sockaddr setup |
|
* in iscsi_target_configfs.c code.. |
|
*/ |
|
memcpy(&np->np_sockaddr, sockaddr, |
|
sizeof(struct sockaddr_storage)); |
|
|
|
if (sockaddr->ss_family == AF_INET6) |
|
len = sizeof(struct sockaddr_in6); |
|
else |
|
len = sizeof(struct sockaddr_in); |
|
/* |
|
* Set SO_REUSEADDR, and disable Nagle Algorithm with TCP_NODELAY. |
|
*/ |
|
if (np->np_network_transport == ISCSI_TCP) |
|
tcp_sock_set_nodelay(sock->sk); |
|
sock_set_reuseaddr(sock->sk); |
|
ip_sock_set_freebind(sock->sk); |
|
|
|
ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len); |
|
if (ret < 0) { |
|
pr_err("kernel_bind() failed: %d\n", ret); |
|
goto fail; |
|
} |
|
|
|
ret = kernel_listen(sock, backlog); |
|
if (ret != 0) { |
|
pr_err("kernel_listen() failed: %d\n", ret); |
|
goto fail; |
|
} |
|
|
|
return 0; |
|
fail: |
|
np->np_socket = NULL; |
|
sock_release(sock); |
|
return ret; |
|
} |
|
|
|
int iscsi_target_setup_login_socket( |
|
struct iscsi_np *np, |
|
struct sockaddr_storage *sockaddr) |
|
{ |
|
struct iscsit_transport *t; |
|
int rc; |
|
|
|
t = iscsit_get_transport(np->np_network_transport); |
|
if (!t) |
|
return -EINVAL; |
|
|
|
rc = t->iscsit_setup_np(np, sockaddr); |
|
if (rc < 0) { |
|
iscsit_put_transport(t); |
|
return rc; |
|
} |
|
|
|
np->np_transport = t; |
|
np->enabled = true; |
|
return 0; |
|
} |
|
|
|
int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn) |
|
{ |
|
struct socket *new_sock, *sock = np->np_socket; |
|
struct sockaddr_in sock_in; |
|
struct sockaddr_in6 sock_in6; |
|
int rc; |
|
|
|
rc = kernel_accept(sock, &new_sock, 0); |
|
if (rc < 0) |
|
return rc; |
|
|
|
conn->sock = new_sock; |
|
conn->login_family = np->np_sockaddr.ss_family; |
|
|
|
if (np->np_sockaddr.ss_family == AF_INET6) { |
|
memset(&sock_in6, 0, sizeof(struct sockaddr_in6)); |
|
|
|
rc = conn->sock->ops->getname(conn->sock, |
|
(struct sockaddr *)&sock_in6, 1); |
|
if (rc >= 0) { |
|
if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) { |
|
memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6)); |
|
} else { |
|
/* Pretend to be an ipv4 socket */ |
|
sock_in.sin_family = AF_INET; |
|
sock_in.sin_port = sock_in6.sin6_port; |
|
memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4); |
|
memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in)); |
|
} |
|
} |
|
|
|
rc = conn->sock->ops->getname(conn->sock, |
|
(struct sockaddr *)&sock_in6, 0); |
|
if (rc >= 0) { |
|
if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) { |
|
memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6)); |
|
} else { |
|
/* Pretend to be an ipv4 socket */ |
|
sock_in.sin_family = AF_INET; |
|
sock_in.sin_port = sock_in6.sin6_port; |
|
memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4); |
|
memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in)); |
|
} |
|
} |
|
} else { |
|
memset(&sock_in, 0, sizeof(struct sockaddr_in)); |
|
|
|
rc = conn->sock->ops->getname(conn->sock, |
|
(struct sockaddr *)&sock_in, 1); |
|
if (rc >= 0) |
|
memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in)); |
|
|
|
rc = conn->sock->ops->getname(conn->sock, |
|
(struct sockaddr *)&sock_in, 0); |
|
if (rc >= 0) |
|
memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in)); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login) |
|
{ |
|
struct iscsi_login_req *login_req; |
|
u32 padding = 0, payload_length; |
|
|
|
if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0) |
|
return -1; |
|
|
|
login_req = (struct iscsi_login_req *)login->req; |
|
payload_length = ntoh24(login_req->dlength); |
|
padding = ((-payload_length) & 3); |
|
|
|
pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x," |
|
" CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n", |
|
login_req->flags, login_req->itt, login_req->cmdsn, |
|
login_req->exp_statsn, login_req->cid, payload_length); |
|
/* |
|
* Setup the initial iscsi_login values from the leading |
|
* login request PDU. |
|
*/ |
|
if (login->first_request) { |
|
login_req = (struct iscsi_login_req *)login->req; |
|
login->leading_connection = (!login_req->tsih) ? 1 : 0; |
|
login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags); |
|
login->version_min = login_req->min_version; |
|
login->version_max = login_req->max_version; |
|
memcpy(login->isid, login_req->isid, 6); |
|
login->cmd_sn = be32_to_cpu(login_req->cmdsn); |
|
login->init_task_tag = login_req->itt; |
|
login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn); |
|
login->cid = be16_to_cpu(login_req->cid); |
|
login->tsih = be16_to_cpu(login_req->tsih); |
|
} |
|
|
|
if (iscsi_target_check_login_request(conn, login) < 0) |
|
return -1; |
|
|
|
memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS); |
|
if (iscsi_login_rx_data(conn, login->req_buf, |
|
payload_length + padding) < 0) |
|
return -1; |
|
|
|
return 0; |
|
} |
|
|
|
int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login, |
|
u32 length) |
|
{ |
|
if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0) |
|
return -1; |
|
|
|
return 0; |
|
} |
|
|
|
static int |
|
iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t) |
|
{ |
|
int rc; |
|
|
|
if (!t->owner) { |
|
conn->conn_transport = t; |
|
return 0; |
|
} |
|
|
|
rc = try_module_get(t->owner); |
|
if (!rc) { |
|
pr_err("try_module_get() failed for %s\n", t->name); |
|
return -EINVAL; |
|
} |
|
|
|
conn->conn_transport = t; |
|
return 0; |
|
} |
|
|
|
static struct iscsi_conn *iscsit_alloc_conn(struct iscsi_np *np) |
|
{ |
|
struct iscsi_conn *conn; |
|
|
|
conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL); |
|
if (!conn) { |
|
pr_err("Could not allocate memory for new connection\n"); |
|
return NULL; |
|
} |
|
pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); |
|
conn->conn_state = TARG_CONN_STATE_FREE; |
|
|
|
init_waitqueue_head(&conn->queues_wq); |
|
INIT_LIST_HEAD(&conn->conn_list); |
|
INIT_LIST_HEAD(&conn->conn_cmd_list); |
|
INIT_LIST_HEAD(&conn->immed_queue_list); |
|
INIT_LIST_HEAD(&conn->response_queue_list); |
|
init_completion(&conn->conn_post_wait_comp); |
|
init_completion(&conn->conn_wait_comp); |
|
init_completion(&conn->conn_wait_rcfr_comp); |
|
init_completion(&conn->conn_waiting_on_uc_comp); |
|
init_completion(&conn->conn_logout_comp); |
|
init_completion(&conn->rx_half_close_comp); |
|
init_completion(&conn->tx_half_close_comp); |
|
init_completion(&conn->rx_login_comp); |
|
spin_lock_init(&conn->cmd_lock); |
|
spin_lock_init(&conn->conn_usage_lock); |
|
spin_lock_init(&conn->immed_queue_lock); |
|
spin_lock_init(&conn->nopin_timer_lock); |
|
spin_lock_init(&conn->response_queue_lock); |
|
spin_lock_init(&conn->state_lock); |
|
|
|
timer_setup(&conn->nopin_response_timer, |
|
iscsit_handle_nopin_response_timeout, 0); |
|
timer_setup(&conn->nopin_timer, iscsit_handle_nopin_timeout, 0); |
|
|
|
if (iscsit_conn_set_transport(conn, np->np_transport) < 0) |
|
goto free_conn; |
|
|
|
conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL); |
|
if (!conn->conn_ops) { |
|
pr_err("Unable to allocate memory for struct iscsi_conn_ops.\n"); |
|
goto put_transport; |
|
} |
|
|
|
if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) { |
|
pr_err("Unable to allocate conn->conn_cpumask\n"); |
|
goto free_conn_ops; |
|
} |
|
|
|
if (!zalloc_cpumask_var(&conn->allowed_cpumask, GFP_KERNEL)) { |
|
pr_err("Unable to allocate conn->allowed_cpumask\n"); |
|
goto free_conn_cpumask; |
|
} |
|
|
|
return conn; |
|
|
|
free_conn_cpumask: |
|
free_cpumask_var(conn->conn_cpumask); |
|
free_conn_ops: |
|
kfree(conn->conn_ops); |
|
put_transport: |
|
iscsit_put_transport(conn->conn_transport); |
|
free_conn: |
|
kfree(conn); |
|
return NULL; |
|
} |
|
|
|
void iscsit_free_conn(struct iscsi_conn *conn) |
|
{ |
|
free_cpumask_var(conn->allowed_cpumask); |
|
free_cpumask_var(conn->conn_cpumask); |
|
kfree(conn->conn_ops); |
|
iscsit_put_transport(conn->conn_transport); |
|
kfree(conn); |
|
} |
|
|
|
void iscsi_target_login_sess_out(struct iscsi_conn *conn, |
|
bool zero_tsih, bool new_sess) |
|
{ |
|
if (!new_sess) |
|
goto old_sess_out; |
|
|
|
pr_err("iSCSI Login negotiation failed.\n"); |
|
iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, |
|
ISCSI_LOGIN_STATUS_INIT_ERR); |
|
if (!zero_tsih || !conn->sess) |
|
goto old_sess_out; |
|
|
|
transport_free_session(conn->sess->se_sess); |
|
ida_free(&sess_ida, conn->sess->session_index); |
|
kfree(conn->sess->sess_ops); |
|
kfree(conn->sess); |
|
conn->sess = NULL; |
|
|
|
old_sess_out: |
|
/* |
|
* If login negotiation fails check if the Time2Retain timer |
|
* needs to be restarted. |
|
*/ |
|
if (!zero_tsih && conn->sess) { |
|
spin_lock_bh(&conn->sess->conn_lock); |
|
if (conn->sess->session_state == TARG_SESS_STATE_FAILED) { |
|
struct se_portal_group *se_tpg = |
|
&conn->tpg->tpg_se_tpg; |
|
|
|
atomic_set(&conn->sess->session_continuation, 0); |
|
spin_unlock_bh(&conn->sess->conn_lock); |
|
spin_lock_bh(&se_tpg->session_lock); |
|
iscsit_start_time2retain_handler(conn->sess); |
|
spin_unlock_bh(&se_tpg->session_lock); |
|
} else |
|
spin_unlock_bh(&conn->sess->conn_lock); |
|
iscsit_dec_session_usage_count(conn->sess); |
|
} |
|
|
|
ahash_request_free(conn->conn_tx_hash); |
|
if (conn->conn_rx_hash) { |
|
struct crypto_ahash *tfm; |
|
|
|
tfm = crypto_ahash_reqtfm(conn->conn_rx_hash); |
|
ahash_request_free(conn->conn_rx_hash); |
|
crypto_free_ahash(tfm); |
|
} |
|
|
|
if (conn->param_list) { |
|
iscsi_release_param_list(conn->param_list); |
|
conn->param_list = NULL; |
|
} |
|
iscsi_target_nego_release(conn); |
|
|
|
if (conn->sock) { |
|
sock_release(conn->sock); |
|
conn->sock = NULL; |
|
} |
|
|
|
if (conn->conn_transport->iscsit_wait_conn) |
|
conn->conn_transport->iscsit_wait_conn(conn); |
|
|
|
if (conn->conn_transport->iscsit_free_conn) |
|
conn->conn_transport->iscsit_free_conn(conn); |
|
|
|
iscsit_free_conn(conn); |
|
} |
|
|
|
static int __iscsi_target_login_thread(struct iscsi_np *np) |
|
{ |
|
u8 *buffer, zero_tsih = 0; |
|
int ret = 0, rc; |
|
struct iscsi_conn *conn = NULL; |
|
struct iscsi_login *login; |
|
struct iscsi_portal_group *tpg = NULL; |
|
struct iscsi_login_req *pdu; |
|
struct iscsi_tpg_np *tpg_np; |
|
bool new_sess = false; |
|
|
|
flush_signals(current); |
|
|
|
spin_lock_bh(&np->np_thread_lock); |
|
if (atomic_dec_if_positive(&np->np_reset_count) >= 0) { |
|
np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; |
|
spin_unlock_bh(&np->np_thread_lock); |
|
complete(&np->np_restart_comp); |
|
return 1; |
|
} else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) { |
|
spin_unlock_bh(&np->np_thread_lock); |
|
goto exit; |
|
} else { |
|
np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; |
|
} |
|
spin_unlock_bh(&np->np_thread_lock); |
|
|
|
conn = iscsit_alloc_conn(np); |
|
if (!conn) { |
|
/* Get another socket */ |
|
return 1; |
|
} |
|
|
|
rc = np->np_transport->iscsit_accept_np(np, conn); |
|
if (rc == -ENOSYS) { |
|
complete(&np->np_restart_comp); |
|
iscsit_free_conn(conn); |
|
goto exit; |
|
} else if (rc < 0) { |
|
spin_lock_bh(&np->np_thread_lock); |
|
if (atomic_dec_if_positive(&np->np_reset_count) >= 0) { |
|
np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; |
|
spin_unlock_bh(&np->np_thread_lock); |
|
complete(&np->np_restart_comp); |
|
iscsit_free_conn(conn); |
|
/* Get another socket */ |
|
return 1; |
|
} |
|
spin_unlock_bh(&np->np_thread_lock); |
|
iscsit_free_conn(conn); |
|
return 1; |
|
} |
|
/* |
|
* Perform the remaining iSCSI connection initialization items.. |
|
*/ |
|
login = iscsi_login_init_conn(conn); |
|
if (!login) { |
|
goto new_sess_out; |
|
} |
|
|
|
iscsi_start_login_thread_timer(np); |
|
|
|
pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n"); |
|
conn->conn_state = TARG_CONN_STATE_XPT_UP; |
|
/* |
|
* This will process the first login request + payload.. |
|
*/ |
|
rc = np->np_transport->iscsit_get_login_rx(conn, login); |
|
if (rc == 1) |
|
return 1; |
|
else if (rc < 0) |
|
goto new_sess_out; |
|
|
|
buffer = &login->req[0]; |
|
pdu = (struct iscsi_login_req *)buffer; |
|
/* |
|
* Used by iscsit_tx_login_rsp() for Login Resonses PDUs |
|
* when Status-Class != 0. |
|
*/ |
|
conn->login_itt = pdu->itt; |
|
|
|
spin_lock_bh(&np->np_thread_lock); |
|
if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { |
|
spin_unlock_bh(&np->np_thread_lock); |
|
pr_err("iSCSI Network Portal on %pISpc currently not" |
|
" active.\n", &np->np_sockaddr); |
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, |
|
ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); |
|
goto new_sess_out; |
|
} |
|
spin_unlock_bh(&np->np_thread_lock); |
|
|
|
conn->network_transport = np->np_network_transport; |
|
|
|
pr_debug("Received iSCSI login request from %pISpc on %s Network" |
|
" Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name, |
|
&conn->local_sockaddr); |
|
|
|
pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n"); |
|
conn->conn_state = TARG_CONN_STATE_IN_LOGIN; |
|
|
|
if (iscsi_login_check_initiator_version(conn, pdu->max_version, |
|
pdu->min_version) < 0) |
|
goto new_sess_out; |
|
|
|
zero_tsih = (pdu->tsih == 0x0000); |
|
if (zero_tsih) { |
|
/* |
|
* This is the leading connection of a new session. |
|
* We wait until after authentication to check for |
|
* session reinstatement. |
|
*/ |
|
if (iscsi_login_zero_tsih_s1(conn, buffer) < 0) |
|
goto new_sess_out; |
|
} else { |
|
/* |
|
* Add a new connection to an existing session. |
|
* We check for a non-existant session in |
|
* iscsi_login_non_zero_tsih_s2() below based |
|
* on ISID/TSIH, but wait until after authentication |
|
* to check for connection reinstatement, etc. |
|
*/ |
|
if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0) |
|
goto new_sess_out; |
|
} |
|
/* |
|
* SessionType: Discovery |
|
* |
|
* Locates Default Portal |
|
* |
|
* SessionType: Normal |
|
* |
|
* Locates Target Portal from NP -> Target IQN |
|
*/ |
|
rc = iscsi_target_locate_portal(np, conn, login); |
|
if (rc < 0) { |
|
tpg = conn->tpg; |
|
goto new_sess_out; |
|
} |
|
login->zero_tsih = zero_tsih; |
|
|
|
if (conn->sess) |
|
conn->sess->se_sess->sup_prot_ops = |
|
conn->conn_transport->iscsit_get_sup_prot_ops(conn); |
|
|
|
tpg = conn->tpg; |
|
if (!tpg) { |
|
pr_err("Unable to locate struct iscsi_conn->tpg\n"); |
|
goto new_sess_out; |
|
} |
|
|
|
if (zero_tsih) { |
|
if (iscsi_login_zero_tsih_s2(conn) < 0) |
|
goto new_sess_out; |
|
} else { |
|
if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0) |
|
goto old_sess_out; |
|
} |
|
|
|
if (conn->conn_transport->iscsit_validate_params) { |
|
ret = conn->conn_transport->iscsit_validate_params(conn); |
|
if (ret < 0) { |
|
if (zero_tsih) |
|
goto new_sess_out; |
|
else |
|
goto old_sess_out; |
|
} |
|
} |
|
|
|
ret = iscsi_target_start_negotiation(login, conn); |
|
if (ret < 0) |
|
goto new_sess_out; |
|
|
|
iscsi_stop_login_thread_timer(np); |
|
|
|
if (ret == 1) { |
|
tpg_np = conn->tpg_np; |
|
|
|
iscsi_post_login_handler(np, conn, zero_tsih); |
|
iscsit_deaccess_np(np, tpg, tpg_np); |
|
} |
|
|
|
tpg = NULL; |
|
tpg_np = NULL; |
|
/* Get another socket */ |
|
return 1; |
|
|
|
new_sess_out: |
|
new_sess = true; |
|
old_sess_out: |
|
iscsi_stop_login_thread_timer(np); |
|
tpg_np = conn->tpg_np; |
|
iscsi_target_login_sess_out(conn, zero_tsih, new_sess); |
|
new_sess = false; |
|
|
|
if (tpg) { |
|
iscsit_deaccess_np(np, tpg, tpg_np); |
|
tpg = NULL; |
|
tpg_np = NULL; |
|
} |
|
|
|
return 1; |
|
|
|
exit: |
|
iscsi_stop_login_thread_timer(np); |
|
spin_lock_bh(&np->np_thread_lock); |
|
np->np_thread_state = ISCSI_NP_THREAD_EXIT; |
|
spin_unlock_bh(&np->np_thread_lock); |
|
|
|
return 0; |
|
} |
|
|
|
int iscsi_target_login_thread(void *arg) |
|
{ |
|
struct iscsi_np *np = arg; |
|
int ret; |
|
|
|
allow_signal(SIGINT); |
|
|
|
while (1) { |
|
ret = __iscsi_target_login_thread(np); |
|
/* |
|
* We break and exit here unless another sock_accept() call |
|
* is expected. |
|
*/ |
|
if (ret != 1) |
|
break; |
|
} |
|
|
|
while (!kthread_should_stop()) { |
|
msleep(100); |
|
} |
|
|
|
return 0; |
|
}
|
|
|