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linux/drivers/target/iscsi/iscsi_target_login.c
Roland Dreier d5627acba9 iscsi-target: Fix missed wakeup race in TX thread 
The sleeping code in iscsi_target_tx_thread() is susceptible to the classic
missed wakeup race:

 - TX thread finishes handle_immediate_queue() and handle_response_queue(),
   thinks both queues are empty.
 - Another thread adds a queue entry and does wake_up_process(), which does
   nothing because the TX thread is still awake.
 - TX thread does schedule_timeout() and sleeps forever.

In practice this can kill an iSCSI connection if for example an initiator
does single-threaded writes and the target misses the wakeup window when
queueing an R2T; in this case the connection will be stuck until the
initiator loses patience and does some task management operation (or kills
the connection entirely).

Fix this by converting to wait_event_interruptible(), which does not
suffer from this sort of race.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Cc: Andy Grover <agrover@redhat.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2012-11-01 00:38:44 -07:00

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/*******************************************************************************
* This file contains the login functions used by the iSCSI Target driver.
*
* \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 <linux/string.h>
#include <linux/kthread.h>
#include <linux/crypto.h>
#include <linux/idr.h>
#include <scsi/iscsi_proto.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include "iscsi_target_core.h"
#include "iscsi_target_tq.h"
#include "iscsi_target_device.h"
#include "iscsi_target_nego.h"
#include "iscsi_target_erl0.h"
#include "iscsi_target_erl2.h"
#include "iscsi_target_login.h"
#include "iscsi_target_stat.h"
#include "iscsi_target_tpg.h"
#include "iscsi_target_util.h"
#include "iscsi_target.h"
#include "iscsi_target_parameters.h"
static int iscsi_login_init_conn(struct iscsi_conn *conn)
{
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);
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);
if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
pr_err("Unable to allocate conn->conn_cpumask\n");
return -ENOMEM;
}
return 0;
}
/*
* Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
* per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
*/
int iscsi_login_setup_crypto(struct iscsi_conn *conn)
{
/*
* Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
* which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
* to software 1x8 byte slicing from crc32c.ko
*/
conn->conn_rx_hash.flags = 0;
conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
CRYPTO_ALG_ASYNC);
if (IS_ERR(conn->conn_rx_hash.tfm)) {
pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
return -ENOMEM;
}
conn->conn_tx_hash.flags = 0;
conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
CRYPTO_ALG_ASYNC);
if (IS_ERR(conn->conn_tx_hash.tfm)) {
pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n");
crypto_free_hash(conn->conn_rx_hash.tfm);
return -ENOMEM;
}
return 0;
}
static int iscsi_login_check_initiator_version(
struct iscsi_conn *conn,
u8 version_max,
u8 version_min)
{
if ((version_max != 0x00) || (version_min != 0x00)) {
pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
" version Min/Max 0x%02x/0x%02x, rejecting login.\n",
version_min, version_max);
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
ISCSI_LOGIN_STATUS_NO_VERSION);
return -1;
}
return 0;
}
int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
{
int sessiontype;
struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
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;
initiatorname_param = iscsi_find_param_from_key(
INITIATORNAME, conn->param_list);
if (!initiatorname_param)
return -1;
sessiontype_param = iscsi_find_param_from_key(
SESSIONTYPE, conn->param_list);
if (!sessiontype_param)
return -1;
sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
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 = se_sess->fabric_sess_ptr;
spin_lock(&sess_p->conn_lock);
if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
atomic_read(&sess_p->session_logout) ||
(sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
spin_unlock(&sess_p->conn_lock);
continue;
}
if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
(!strcmp(sess_p->sess_ops->InitiatorName,
initiatorname_param->value) &&
(sess_p->sess_ops->SessionType == sessiontype))) {
atomic_set(&sess_p->session_reinstatement, 1);
spin_unlock(&sess_p->conn_lock);
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.
*/
if (!sess)
return 0;
pr_debug("%s iSCSI Session SID %u is still active for %s,"
" preforming session reinstatement.\n", (sessiontype) ?
"Discovery" : "Normal", sess->sid,
sess->sess_ops->InitiatorName);
spin_lock_bh(&sess->conn_lock);
if (sess->session_state == TARG_SESS_STATE_FAILED) {
spin_unlock_bh(&sess->conn_lock);
iscsit_dec_session_usage_count(sess);
target_put_session(sess->se_sess);
return 0;
}
spin_unlock_bh(&sess->conn_lock);
iscsit_stop_session(sess, 1, 1);
iscsit_dec_session_usage_count(sess);
target_put_session(sess->se_sess);
return 0;
}
static void iscsi_login_set_conn_values(
struct iscsi_session *sess,
struct iscsi_conn *conn,
__be16 cid)
{
conn->sess = sess;
conn->cid = be16_to_cpu(cid);
/*
* Generate a random Status sequence number (statsn) for the new
* iSCSI connection.
*/
get_random_bytes(&conn->stat_sn, sizeof(u32));
mutex_lock(&auth_id_lock);
conn->auth_id = iscsit_global->auth_id++;
mutex_unlock(&auth_id_lock);
}
/*
* This is the leading connection of a new session,
* or session reinstatement.
*/
static int iscsi_login_zero_tsih_s1(
struct iscsi_conn *conn,
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);
pr_err("Could not allocate memory for session\n");
return -ENOMEM;
}
iscsi_login_set_conn_values(sess, conn, pdu->cid);
sess->init_task_tag = pdu->itt;
memcpy(&sess->isid, pdu->isid, 6);
sess->exp_cmd_sn = be32_to_cpu(pdu->cmdsn);
INIT_LIST_HEAD(&sess->sess_conn_list);
INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
INIT_LIST_HEAD(&sess->cr_active_list);
INIT_LIST_HEAD(&sess->cr_inactive_list);
init_completion(&sess->async_msg_comp);
init_completion(&sess->reinstatement_comp);
init_completion(&sess->session_wait_comp);
init_completion(&sess->session_waiting_on_uc_comp);
mutex_init(&sess->cmdsn_mutex);
spin_lock_init(&sess->conn_lock);
spin_lock_init(&sess->cr_a_lock);
spin_lock_init(&sess->cr_i_lock);
spin_lock_init(&sess->session_usage_lock);
spin_lock_init(&sess->ttt_lock);
if (!idr_pre_get(&sess_idr, GFP_KERNEL)) {
pr_err("idr_pre_get() for sess_idr failed\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_NO_RESOURCES);
kfree(sess);
return -ENOMEM;
}
spin_lock(&sess_idr_lock);
ret = idr_get_new(&sess_idr, NULL, &sess->session_index);
spin_unlock(&sess_idr_lock);
if (ret < 0) {
pr_err("idr_get_new() for sess_idr failed\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_NO_RESOURCES);
kfree(sess);
return -ENOMEM;
}
sess->creation_time = get_jiffies_64();
spin_lock_init(&sess->session_stats_lock);
/*
* The FFP CmdSN window values will be allocated from the TPG's
* Initiator Node's ACL once the login has been successfully completed.
*/
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");
kfree(sess);
return -ENOMEM;
}
sess->se_sess = transport_init_session();
if (IS_ERR(sess->se_sess)) {
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_NO_RESOURCES);
kfree(sess);
return -ENOMEM;
}
return 0;
}
static int iscsi_login_zero_tsih_s2(
struct iscsi_conn *conn)
{
struct iscsi_node_attrib *na;
struct iscsi_session *sess = conn->sess;
unsigned char buf[32];
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 = ++ISCSI_TPG_S(sess)->ntsih;
if (!sess->tsih)
sess->tsih = ++ISCSI_TPG_S(sess)->ntsih;
/*
* Create the default params from user defined values..
*/
if (iscsi_copy_param_list(&conn->param_list,
ISCSI_TPG_C(conn)->param_list, 1) < 0) {
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_NO_RESOURCES);
return -1;
}
iscsi_set_keys_to_negotiate(0, conn->param_list);
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.
*/
memset(buf, 0, 32);
sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt);
if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_NO_RESOURCES);
return -1;
}
/*
* Workaround for Initiators that have broken connection recovery logic.
*
* "We would really like to get rid of this." Linux-iSCSI.org team
*/
memset(buf, 0, 32);
sprintf(buf, "ErrorRecoveryLevel=%d", na->default_erl);
if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_NO_RESOURCES);
return -1;
}
if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
return -1;
return 0;
}
/*
* Remove PSTATE_NEGOTIATE for the four FIM related keys.
* The Initiator node will be able to enable FIM by proposing them itself.
*/
int iscsi_login_disable_FIM_keys(
struct iscsi_param_list *param_list,
struct iscsi_conn *conn)
{
struct iscsi_param *param;
param = iscsi_find_param_from_key("OFMarker", param_list);
if (!param) {
pr_err("iscsi_find_param_from_key() for"
" OFMarker failed\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_NO_RESOURCES);
return -1;
}
param->state &= ~PSTATE_NEGOTIATE;
param = iscsi_find_param_from_key("OFMarkInt", param_list);
if (!param) {
pr_err("iscsi_find_param_from_key() for"
" IFMarker failed\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_NO_RESOURCES);
return -1;
}
param->state &= ~PSTATE_NEGOTIATE;
param = iscsi_find_param_from_key("IFMarker", param_list);
if (!param) {
pr_err("iscsi_find_param_from_key() for"
" IFMarker failed\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_NO_RESOURCES);
return -1;
}
param->state &= ~PSTATE_NEGOTIATE;
param = iscsi_find_param_from_key("IFMarkInt", param_list);
if (!param) {
pr_err("iscsi_find_param_from_key() for"
" IFMarker failed\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_NO_RESOURCES);
return -1;
}
param->state &= ~PSTATE_NEGOTIATE;
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;
iscsi_login_set_conn_values(NULL, conn, pdu->cid);
return 0;
}
/*
* 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;
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) ||
(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);
iscsi_login_set_conn_values(sess, conn, pdu->cid);
if (iscsi_copy_param_list(&conn->param_list,
ISCSI_TPG_C(conn)->param_list, 0) < 0) {
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_NO_RESOURCES);
return -1;
}
iscsi_set_keys_to_negotiate(0, conn->param_list);
/*
* 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.
*/
memset(buf, 0, 32);
sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt);
if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_NO_RESOURCES);
return -1;
}
return iscsi_login_disable_FIM_keys(conn->param_list, conn);
}
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 entires 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;
if (!sess->sess_ops->SessionType)
iscsit_start_nopin_timer(conn);
}
static int 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 = ISCSI_TPG_S(sess);
struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
struct iscsi_thread_set *ts;
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);
iscsit_set_sync_and_steering_values(conn);
/*
* SCSI Initiator -> SCSI Target Port Mapping
*/
ts = iscsi_get_thread_set();
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 %s to"
" %s:%hu,%hu\n", conn->cid, conn->login_ip,
conn->local_ip, conn->local_port, 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);
iscsi_activate_thread_set(conn, ts);
/*
* 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;
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 0;
}
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 %s to %s:%hu,%hu\n",
conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
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);
iscsi_activate_thread_set(conn, ts);
/*
* 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;
iscsit_dec_conn_usage_count(conn);
return 0;
}
static void iscsi_handle_login_thread_timeout(unsigned long data)
{
struct iscsi_np *np = (struct iscsi_np *) data;
spin_lock_bh(&np->np_thread_lock);
pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
np->np_ip, np->np_port);
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);
init_timer(&np->np_login_timer);
np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
np->np_login_timer.data = (unsigned long)np;
np->np_login_timer.function = iscsi_handle_login_thread_timeout;
np->np_login_timer_flags &= ~ISCSI_TF_STOP;
np->np_login_timer_flags |= ISCSI_TF_RUNNING;
add_timer(&np->np_login_timer);
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 iscsi_target_setup_login_socket(
struct iscsi_np *np,
struct __kernel_sockaddr_storage *sockaddr)
{
struct socket *sock;
int backlog = 5, ret, opt = 0, 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;
case ISCSI_IWARP_TCP:
case ISCSI_IWARP_SCTP:
case ISCSI_INFINIBAND:
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 __kernel_sockaddr_storage));
if (sockaddr->ss_family == AF_INET6)
len = sizeof(struct sockaddr_in6);
else
len = sizeof(struct sockaddr_in);
/*
* Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
*/
/* FIXME: Someone please explain why this is endian-safe */
opt = 1;
if (np->np_network_transport == ISCSI_TCP) {
ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
(char *)&opt, sizeof(opt));
if (ret < 0) {
pr_err("kernel_setsockopt() for TCP_NODELAY"
" failed: %d\n", ret);
goto fail;
}
}
/* FIXME: Someone please explain why this is endian-safe */
ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
(char *)&opt, sizeof(opt));
if (ret < 0) {
pr_err("kernel_setsockopt() for SO_REUSEADDR"
" failed\n");
goto fail;
}
ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
(char *)&opt, sizeof(opt));
if (ret < 0) {
pr_err("kernel_setsockopt() for IP_FREEBIND"
" failed\n");
goto fail;
}
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;
if (sock)
sock_release(sock);
return ret;
}
static int __iscsi_target_login_thread(struct iscsi_np *np)
{
u8 buffer[ISCSI_HDR_LEN], iscsi_opcode, zero_tsih = 0;
int err, ret = 0, stop;
struct iscsi_conn *conn = NULL;
struct iscsi_login *login;
struct iscsi_portal_group *tpg = NULL;
struct socket *new_sock, *sock;
struct kvec iov;
struct iscsi_login_req *pdu;
struct sockaddr_in sock_in;
struct sockaddr_in6 sock_in6;
flush_signals(current);
sock = np->np_socket;
spin_lock_bh(&np->np_thread_lock);
if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
complete(&np->np_restart_comp);
} else {
np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
}
spin_unlock_bh(&np->np_thread_lock);
if (kernel_accept(sock, &new_sock, 0) < 0) {
spin_lock_bh(&np->np_thread_lock);
if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
spin_unlock_bh(&np->np_thread_lock);
complete(&np->np_restart_comp);
/* Get another socket */
return 1;
}
spin_unlock_bh(&np->np_thread_lock);
goto out;
}
iscsi_start_login_thread_timer(np);
conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
if (!conn) {
pr_err("Could not allocate memory for"
" new connection\n");
sock_release(new_sock);
/* Get another socket */
return 1;
}
pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
conn->conn_state = TARG_CONN_STATE_FREE;
conn->sock = new_sock;
pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
conn->conn_state = TARG_CONN_STATE_XPT_UP;
/*
* Allocate conn->conn_ops early as a failure calling
* iscsit_tx_login_rsp() below will call tx_data().
*/
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 new_sess_out;
}
/*
* Perform the remaining iSCSI connection initialization items..
*/
if (iscsi_login_init_conn(conn) < 0)
goto new_sess_out;
memset(buffer, 0, ISCSI_HDR_LEN);
memset(&iov, 0, sizeof(struct kvec));
iov.iov_base = buffer;
iov.iov_len = ISCSI_HDR_LEN;
if (rx_data(conn, &iov, 1, ISCSI_HDR_LEN) <= 0) {
pr_err("rx_data() returned an error.\n");
goto new_sess_out;
}
iscsi_opcode = (buffer[0] & ISCSI_OPCODE_MASK);
if (!(iscsi_opcode & ISCSI_OP_LOGIN)) {
pr_err("First opcode is not login request,"
" failing login request.\n");
goto new_sess_out;
}
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 %s:%hu currently not"
" active.\n", np->np_ip, np->np_port);
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);
if (np->np_sockaddr.ss_family == AF_INET6) {
memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
if (conn->sock->ops->getname(conn->sock,
(struct sockaddr *)&sock_in6, &err, 1) < 0) {
pr_err("sock_ops->getname() failed.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_TARGET_ERROR);
goto new_sess_out;
}
snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
&sock_in6.sin6_addr.in6_u);
conn->login_port = ntohs(sock_in6.sin6_port);
if (conn->sock->ops->getname(conn->sock,
(struct sockaddr *)&sock_in6, &err, 0) < 0) {
pr_err("sock_ops->getname() failed.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_TARGET_ERROR);
goto new_sess_out;
}
snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
&sock_in6.sin6_addr.in6_u);
conn->local_port = ntohs(sock_in6.sin6_port);
} else {
memset(&sock_in, 0, sizeof(struct sockaddr_in));
if (conn->sock->ops->getname(conn->sock,
(struct sockaddr *)&sock_in, &err, 1) < 0) {
pr_err("sock_ops->getname() failed.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_TARGET_ERROR);
goto new_sess_out;
}
sprintf(conn->login_ip, "%pI4", &sock_in.sin_addr.s_addr);
conn->login_port = ntohs(sock_in.sin_port);
if (conn->sock->ops->getname(conn->sock,
(struct sockaddr *)&sock_in, &err, 0) < 0) {
pr_err("sock_ops->getname() failed.\n");
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_TARGET_ERROR);
goto new_sess_out;
}
sprintf(conn->local_ip, "%pI4", &sock_in.sin_addr.s_addr);
conn->local_port = ntohs(sock_in.sin_port);
}
conn->network_transport = np->np_network_transport;
pr_debug("Received iSCSI login request from %s on %s Network"
" Portal %s:%hu\n", conn->login_ip,
(conn->network_transport == ISCSI_TCP) ? "TCP" : "SCTP",
conn->local_ip, conn->local_port);
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;
}
/*
* This will process the first login request, and call
* iscsi_target_locate_portal(), and return a valid struct iscsi_login.
*/
login = iscsi_target_init_negotiation(np, conn, buffer);
if (!login) {
tpg = conn->tpg;
goto new_sess_out;
}
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) {
iscsi_target_nego_release(login, conn);
goto new_sess_out;
}
} else {
if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0) {
iscsi_target_nego_release(login, conn);
goto old_sess_out;
}
}
if (iscsi_target_start_negotiation(login, conn) < 0)
goto new_sess_out;
if (!conn->sess) {
pr_err("struct iscsi_conn session pointer is NULL!\n");
goto new_sess_out;
}
iscsi_stop_login_thread_timer(np);
if (signal_pending(current))
goto new_sess_out;
ret = iscsi_post_login_handler(np, conn, zero_tsih);
if (ret < 0)
goto new_sess_out;
iscsit_deaccess_np(np, tpg);
tpg = NULL;
/* Get another socket */
return 1;
new_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;
if (conn->sess->se_sess)
transport_free_session(conn->sess->se_sess);
if (conn->sess->session_index != 0) {
spin_lock_bh(&sess_idr_lock);
idr_remove(&sess_idr, conn->sess->session_index);
spin_unlock_bh(&sess_idr_lock);
}
if (conn->sess->sess_ops)
kfree(conn->sess->sess_ops);
if (conn->sess)
kfree(conn->sess);
old_sess_out:
iscsi_stop_login_thread_timer(np);
/*
* 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 =
&ISCSI_TPG_C(conn)->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);
}
if (!IS_ERR(conn->conn_rx_hash.tfm))
crypto_free_hash(conn->conn_rx_hash.tfm);
if (!IS_ERR(conn->conn_tx_hash.tfm))
crypto_free_hash(conn->conn_tx_hash.tfm);
if (conn->conn_cpumask)
free_cpumask_var(conn->conn_cpumask);
kfree(conn->conn_ops);
if (conn->param_list) {
iscsi_release_param_list(conn->param_list);
conn->param_list = NULL;
}
if (conn->sock)
sock_release(conn->sock);
kfree(conn);
if (tpg) {
iscsit_deaccess_np(np, tpg);
tpg = NULL;
}
out:
stop = kthread_should_stop();
if (!stop && signal_pending(current)) {
spin_lock_bh(&np->np_thread_lock);
stop = (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN);
spin_unlock_bh(&np->np_thread_lock);
}
/* Wait for another socket.. */
if (!stop)
return 1;
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 (!kthread_should_stop()) {
ret = __iscsi_target_login_thread(np);
/*
* We break and exit here unless another sock_accept() call
* is expected.
*/
if (ret != 1)
break;
}
return 0;
}
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