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linux/drivers/target/iscsi/iscsi_target.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*******************************************************************************
* This file contains main functions related to the iSCSI Target Core Driver.
*
* (c) Copyright 2007-2013 Datera, Inc.
*
* Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
*
******************************************************************************/
#include <crypto/hash.h>
#include <linux/string.h>
#include <linux/kthread.h>
#include <linux/completion.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/idr.h>
#include <linux/delay.h>
#include <linux/sched/signal.h>
#include <asm/unaligned.h>
#include <linux/inet.h>
#include <net/ipv6.h>
#include <scsi/scsi_proto.h>
#include <scsi/iscsi_proto.h>
#include <scsi/scsi_tcq.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include <target/iscsi/iscsi_target_core.h>
#include "iscsi_target_parameters.h"
#include "iscsi_target_seq_pdu_list.h"
#include "iscsi_target_datain_values.h"
#include "iscsi_target_erl0.h"
#include "iscsi_target_erl1.h"
#include "iscsi_target_erl2.h"
#include "iscsi_target_login.h"
#include "iscsi_target_tmr.h"
#include "iscsi_target_tpg.h"
#include "iscsi_target_util.h"
#include "iscsi_target.h"
#include "iscsi_target_device.h"
#include <target/iscsi/iscsi_target_stat.h>
#include <target/iscsi/iscsi_transport.h>
static LIST_HEAD(g_tiqn_list);
static LIST_HEAD(g_np_list);
static DEFINE_SPINLOCK(tiqn_lock);
static DEFINE_MUTEX(np_lock);
static struct idr tiqn_idr;
DEFINE_IDA(sess_ida);
struct mutex auth_id_lock;
struct iscsit_global *iscsit_global;
struct kmem_cache *lio_qr_cache;
struct kmem_cache *lio_dr_cache;
struct kmem_cache *lio_ooo_cache;
struct kmem_cache *lio_r2t_cache;
static int iscsit_handle_immediate_data(struct iscsi_cmd *,
struct iscsi_scsi_req *, u32);
struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
{
struct iscsi_tiqn *tiqn = NULL;
spin_lock(&tiqn_lock);
list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
if (!strcmp(tiqn->tiqn, buf)) {
spin_lock(&tiqn->tiqn_state_lock);
if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
tiqn->tiqn_access_count++;
spin_unlock(&tiqn->tiqn_state_lock);
spin_unlock(&tiqn_lock);
return tiqn;
}
spin_unlock(&tiqn->tiqn_state_lock);
}
}
spin_unlock(&tiqn_lock);
return NULL;
}
static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
{
spin_lock(&tiqn->tiqn_state_lock);
if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
spin_unlock(&tiqn->tiqn_state_lock);
return 0;
}
spin_unlock(&tiqn->tiqn_state_lock);
return -1;
}
void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
{
spin_lock(&tiqn->tiqn_state_lock);
tiqn->tiqn_access_count--;
spin_unlock(&tiqn->tiqn_state_lock);
}
/*
* Note that IQN formatting is expected to be done in userspace, and
* no explict IQN format checks are done here.
*/
struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
{
struct iscsi_tiqn *tiqn = NULL;
int ret;
if (strlen(buf) >= ISCSI_IQN_LEN) {
pr_err("Target IQN exceeds %d bytes\n",
ISCSI_IQN_LEN);
return ERR_PTR(-EINVAL);
}
tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
if (!tiqn)
return ERR_PTR(-ENOMEM);
sprintf(tiqn->tiqn, "%s", buf);
INIT_LIST_HEAD(&tiqn->tiqn_list);
INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
spin_lock_init(&tiqn->tiqn_state_lock);
spin_lock_init(&tiqn->tiqn_tpg_lock);
spin_lock_init(&tiqn->sess_err_stats.lock);
spin_lock_init(&tiqn->login_stats.lock);
spin_lock_init(&tiqn->logout_stats.lock);
tiqn->tiqn_state = TIQN_STATE_ACTIVE;
idr_preload(GFP_KERNEL);
spin_lock(&tiqn_lock);
ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
if (ret < 0) {
pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
spin_unlock(&tiqn_lock);
idr_preload_end();
kfree(tiqn);
return ERR_PTR(ret);
}
tiqn->tiqn_index = ret;
list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
spin_unlock(&tiqn_lock);
idr_preload_end();
pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
return tiqn;
}
static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
{
/*
* Wait for accesses to said struct iscsi_tiqn to end.
*/
spin_lock(&tiqn->tiqn_state_lock);
while (tiqn->tiqn_access_count != 0) {
spin_unlock(&tiqn->tiqn_state_lock);
msleep(10);
spin_lock(&tiqn->tiqn_state_lock);
}
spin_unlock(&tiqn->tiqn_state_lock);
}
void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
{
/*
* iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
* while holding tiqn->tiqn_state_lock. This means that all subsequent
* attempts to access this struct iscsi_tiqn will fail from both transport
* fabric and control code paths.
*/
if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
pr_err("iscsit_set_tiqn_shutdown() failed\n");
return;
}
iscsit_wait_for_tiqn(tiqn);
spin_lock(&tiqn_lock);
list_del(&tiqn->tiqn_list);
idr_remove(&tiqn_idr, tiqn->tiqn_index);
spin_unlock(&tiqn_lock);
pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
tiqn->tiqn);
kfree(tiqn);
}
int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
{
int ret;
/*
* Determine if the network portal is accepting storage traffic.
*/
spin_lock_bh(&np->np_thread_lock);
if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
spin_unlock_bh(&np->np_thread_lock);
return -1;
}
spin_unlock_bh(&np->np_thread_lock);
/*
* Determine if the portal group is accepting storage traffic.
*/
spin_lock_bh(&tpg->tpg_state_lock);
if (tpg->tpg_state != TPG_STATE_ACTIVE) {
spin_unlock_bh(&tpg->tpg_state_lock);
return -1;
}
spin_unlock_bh(&tpg->tpg_state_lock);
/*
* Here we serialize access across the TIQN+TPG Tuple.
*/
ret = down_interruptible(&tpg->np_login_sem);
if (ret != 0)
return -1;
spin_lock_bh(&tpg->tpg_state_lock);
if (tpg->tpg_state != TPG_STATE_ACTIVE) {
spin_unlock_bh(&tpg->tpg_state_lock);
up(&tpg->np_login_sem);
return -1;
}
spin_unlock_bh(&tpg->tpg_state_lock);
return 0;
}
void iscsit_login_kref_put(struct kref *kref)
{
struct iscsi_tpg_np *tpg_np = container_of(kref,
struct iscsi_tpg_np, tpg_np_kref);
complete(&tpg_np->tpg_np_comp);
}
int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
struct iscsi_tpg_np *tpg_np)
{
struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
up(&tpg->np_login_sem);
if (tpg_np)
kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
if (tiqn)
iscsit_put_tiqn_for_login(tiqn);
return 0;
}
bool iscsit_check_np_match(
struct sockaddr_storage *sockaddr,
struct iscsi_np *np,
int network_transport)
{
struct sockaddr_in *sock_in, *sock_in_e;
struct sockaddr_in6 *sock_in6, *sock_in6_e;
bool ip_match = false;
u16 port, port_e;
if (sockaddr->ss_family == AF_INET6) {
sock_in6 = (struct sockaddr_in6 *)sockaddr;
sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
if (!memcmp(&sock_in6->sin6_addr.in6_u,
&sock_in6_e->sin6_addr.in6_u,
sizeof(struct in6_addr)))
ip_match = true;
port = ntohs(sock_in6->sin6_port);
port_e = ntohs(sock_in6_e->sin6_port);
} else {
sock_in = (struct sockaddr_in *)sockaddr;
sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
ip_match = true;
port = ntohs(sock_in->sin_port);
port_e = ntohs(sock_in_e->sin_port);
}
if (ip_match && (port_e == port) &&
(np->np_network_transport == network_transport))
return true;
return false;
}
static struct iscsi_np *iscsit_get_np(
struct sockaddr_storage *sockaddr,
int network_transport)
{
struct iscsi_np *np;
bool match;
lockdep_assert_held(&np_lock);
list_for_each_entry(np, &g_np_list, np_list) {
spin_lock_bh(&np->np_thread_lock);
if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
spin_unlock_bh(&np->np_thread_lock);
continue;
}
match = iscsit_check_np_match(sockaddr, np, network_transport);
if (match) {
/*
* Increment the np_exports reference count now to
* prevent iscsit_del_np() below from being called
* while iscsi_tpg_add_network_portal() is called.
*/
np->np_exports++;
spin_unlock_bh(&np->np_thread_lock);
return np;
}
spin_unlock_bh(&np->np_thread_lock);
}
return NULL;
}
struct iscsi_np *iscsit_add_np(
struct sockaddr_storage *sockaddr,
int network_transport)
{
struct iscsi_np *np;
int ret;
mutex_lock(&np_lock);
/*
* Locate the existing struct iscsi_np if already active..
*/
np = iscsit_get_np(sockaddr, network_transport);
if (np) {
mutex_unlock(&np_lock);
return np;
}
np = kzalloc(sizeof(*np), GFP_KERNEL);
if (!np) {
mutex_unlock(&np_lock);
return ERR_PTR(-ENOMEM);
}
np->np_flags |= NPF_IP_NETWORK;
np->np_network_transport = network_transport;
spin_lock_init(&np->np_thread_lock);
init_completion(&np->np_restart_comp);
INIT_LIST_HEAD(&np->np_list);
timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
ret = iscsi_target_setup_login_socket(np, sockaddr);
if (ret != 0) {
kfree(np);
mutex_unlock(&np_lock);
return ERR_PTR(ret);
}
np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
if (IS_ERR(np->np_thread)) {
pr_err("Unable to create kthread: iscsi_np\n");
ret = PTR_ERR(np->np_thread);
kfree(np);
mutex_unlock(&np_lock);
return ERR_PTR(ret);
}
/*
* Increment the np_exports reference count now to prevent
* iscsit_del_np() below from being run while a new call to
* iscsi_tpg_add_network_portal() for a matching iscsi_np is
* active. We don't need to hold np->np_thread_lock at this
* point because iscsi_np has not been added to g_np_list yet.
*/
np->np_exports = 1;
np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
list_add_tail(&np->np_list, &g_np_list);
mutex_unlock(&np_lock);
pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
&np->np_sockaddr, np->np_transport->name);
return np;
}
int iscsit_reset_np_thread(
struct iscsi_np *np,
struct iscsi_tpg_np *tpg_np,
struct iscsi_portal_group *tpg,
bool shutdown)
{
spin_lock_bh(&np->np_thread_lock);
if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
spin_unlock_bh(&np->np_thread_lock);
return 0;
}
np->np_thread_state = ISCSI_NP_THREAD_RESET;
atomic_inc(&np->np_reset_count);
if (np->np_thread) {
spin_unlock_bh(&np->np_thread_lock);
send_sig(SIGINT, np->np_thread, 1);
wait_for_completion(&np->np_restart_comp);
spin_lock_bh(&np->np_thread_lock);
}
spin_unlock_bh(&np->np_thread_lock);
if (tpg_np && shutdown) {
kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
wait_for_completion(&tpg_np->tpg_np_comp);
}
return 0;
}
static void iscsit_free_np(struct iscsi_np *np)
{
if (np->np_socket)
sock_release(np->np_socket);
}
int iscsit_del_np(struct iscsi_np *np)
{
spin_lock_bh(&np->np_thread_lock);
np->np_exports--;
if (np->np_exports) {
np->enabled = true;
spin_unlock_bh(&np->np_thread_lock);
return 0;
}
np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
spin_unlock_bh(&np->np_thread_lock);
if (np->np_thread) {
/*
* We need to send the signal to wakeup Linux/Net
* which may be sleeping in sock_accept()..
*/
send_sig(SIGINT, np->np_thread, 1);
kthread_stop(np->np_thread);
np->np_thread = NULL;
}
np->np_transport->iscsit_free_np(np);
mutex_lock(&np_lock);
list_del(&np->np_list);
mutex_unlock(&np_lock);
pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
&np->np_sockaddr, np->np_transport->name);
iscsit_put_transport(np->np_transport);
kfree(np);
return 0;
}
static void iscsit_get_rx_pdu(struct iscsi_conn *);
int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
{
return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
}
EXPORT_SYMBOL(iscsit_queue_rsp);
void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
{
spin_lock_bh(&conn->cmd_lock);
if (!list_empty(&cmd->i_conn_node) &&
!(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
list_del_init(&cmd->i_conn_node);
spin_unlock_bh(&conn->cmd_lock);
__iscsit_free_cmd(cmd, true);
}
EXPORT_SYMBOL(iscsit_aborted_task);
static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
u32, u32, const void *, void *);
static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
static int
iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
const void *data_buf, u32 data_buf_len)
{
struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
struct kvec *iov;
u32 niov = 0, tx_size = ISCSI_HDR_LEN;
int ret;
iov = &cmd->iov_misc[0];
iov[niov].iov_base = cmd->pdu;
iov[niov++].iov_len = ISCSI_HDR_LEN;
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
ISCSI_HDR_LEN, 0, NULL,
header_digest);
iov[0].iov_len += ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
pr_debug("Attaching CRC32C HeaderDigest"
" to opcode 0x%x 0x%08x\n",
hdr->opcode, *header_digest);
}
if (data_buf_len) {
u32 padding = ((-data_buf_len) & 3);
iov[niov].iov_base = (void *)data_buf;
iov[niov++].iov_len = data_buf_len;
tx_size += data_buf_len;
if (padding != 0) {
iov[niov].iov_base = &cmd->pad_bytes;
iov[niov++].iov_len = padding;
tx_size += padding;
pr_debug("Attaching %u additional"
" padding bytes.\n", padding);
}
if (conn->conn_ops->DataDigest) {
iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
data_buf, data_buf_len,
padding, &cmd->pad_bytes,
&cmd->data_crc);
iov[niov].iov_base = &cmd->data_crc;
iov[niov++].iov_len = ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
pr_debug("Attached DataDigest for %u"
" bytes opcode 0x%x, CRC 0x%08x\n",
data_buf_len, hdr->opcode, cmd->data_crc);
}
}
cmd->iov_misc_count = niov;
cmd->tx_size = tx_size;
ret = iscsit_send_tx_data(cmd, conn, 1);
if (ret < 0) {
iscsit_tx_thread_wait_for_tcp(conn);
return ret;
}
return 0;
}
static int iscsit_map_iovec(struct iscsi_cmd *cmd, struct kvec *iov, int nvec,
u32 data_offset, u32 data_length);
static void iscsit_unmap_iovec(struct iscsi_cmd *);
static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
u32, u32, u32, u8 *);
static int
iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
const struct iscsi_datain *datain)
{
struct kvec *iov;
u32 iov_count = 0, tx_size = 0;
int ret, iov_ret;
iov = &cmd->iov_data[0];
iov[iov_count].iov_base = cmd->pdu;
iov[iov_count++].iov_len = ISCSI_HDR_LEN;
tx_size += ISCSI_HDR_LEN;
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
ISCSI_HDR_LEN, 0, NULL,
header_digest);
iov[0].iov_len += ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
*header_digest);
}
iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[iov_count],
cmd->orig_iov_data_count - (iov_count + 2),
datain->offset, datain->length);
if (iov_ret < 0)
return -1;
iov_count += iov_ret;
tx_size += datain->length;
cmd->padding = ((-datain->length) & 3);
if (cmd->padding) {
iov[iov_count].iov_base = cmd->pad_bytes;
iov[iov_count++].iov_len = cmd->padding;
tx_size += cmd->padding;
pr_debug("Attaching %u padding bytes\n", cmd->padding);
}
if (conn->conn_ops->DataDigest) {
cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
cmd, datain->offset,
datain->length,
cmd->padding,
cmd->pad_bytes);
iov[iov_count].iov_base = &cmd->data_crc;
iov[iov_count++].iov_len = ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
datain->length + cmd->padding, cmd->data_crc);
}
cmd->iov_data_count = iov_count;
cmd->tx_size = tx_size;
ret = iscsit_fe_sendpage_sg(cmd, conn);
iscsit_unmap_iovec(cmd);
if (ret < 0) {
iscsit_tx_thread_wait_for_tcp(conn);
return ret;
}
return 0;
}
static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
struct iscsi_datain_req *dr, const void *buf,
u32 buf_len)
{
if (dr)
return iscsit_xmit_datain_pdu(conn, cmd, buf);
else
return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
}
static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
{
return TARGET_PROT_NORMAL;
}
static struct iscsit_transport iscsi_target_transport = {
.name = "iSCSI/TCP",
.transport_type = ISCSI_TCP,
.rdma_shutdown = false,
.owner = NULL,
.iscsit_setup_np = iscsit_setup_np,
.iscsit_accept_np = iscsit_accept_np,
.iscsit_free_np = iscsit_free_np,
.iscsit_get_login_rx = iscsit_get_login_rx,
.iscsit_put_login_tx = iscsit_put_login_tx,
.iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
.iscsit_immediate_queue = iscsit_immediate_queue,
.iscsit_response_queue = iscsit_response_queue,
.iscsit_queue_data_in = iscsit_queue_rsp,
.iscsit_queue_status = iscsit_queue_rsp,
.iscsit_aborted_task = iscsit_aborted_task,
.iscsit_xmit_pdu = iscsit_xmit_pdu,
.iscsit_get_rx_pdu = iscsit_get_rx_pdu,
.iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
};
static int __init iscsi_target_init_module(void)
{
int ret = 0, size;
pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
if (!iscsit_global)
return -1;
spin_lock_init(&iscsit_global->ts_bitmap_lock);
mutex_init(&auth_id_lock);
idr_init(&tiqn_idr);
ret = target_register_template(&iscsi_ops);
if (ret)
goto out;
size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
iscsit_global->ts_bitmap = vzalloc(size);
if (!iscsit_global->ts_bitmap)
goto configfs_out;
lio_qr_cache = kmem_cache_create("lio_qr_cache",
sizeof(struct iscsi_queue_req),
__alignof__(struct iscsi_queue_req), 0, NULL);
if (!lio_qr_cache) {
pr_err("Unable to kmem_cache_create() for"
" lio_qr_cache\n");
goto bitmap_out;
}
lio_dr_cache = kmem_cache_create("lio_dr_cache",
sizeof(struct iscsi_datain_req),
__alignof__(struct iscsi_datain_req), 0, NULL);
if (!lio_dr_cache) {
pr_err("Unable to kmem_cache_create() for"
" lio_dr_cache\n");
goto qr_out;
}
lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
sizeof(struct iscsi_ooo_cmdsn),
__alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
if (!lio_ooo_cache) {
pr_err("Unable to kmem_cache_create() for"
" lio_ooo_cache\n");
goto dr_out;
}
lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
0, NULL);
if (!lio_r2t_cache) {
pr_err("Unable to kmem_cache_create() for"
" lio_r2t_cache\n");
goto ooo_out;
}
iscsit_register_transport(&iscsi_target_transport);
if (iscsit_load_discovery_tpg() < 0)
goto r2t_out;
return ret;
r2t_out:
iscsit_unregister_transport(&iscsi_target_transport);
kmem_cache_destroy(lio_r2t_cache);
ooo_out:
kmem_cache_destroy(lio_ooo_cache);
dr_out:
kmem_cache_destroy(lio_dr_cache);
qr_out:
kmem_cache_destroy(lio_qr_cache);
bitmap_out:
vfree(iscsit_global->ts_bitmap);
configfs_out:
/* XXX: this probably wants it to be it's own unwind step.. */
if (iscsit_global->discovery_tpg)
iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
target_unregister_template(&iscsi_ops);
out:
kfree(iscsit_global);
return -ENOMEM;
}
static void __exit iscsi_target_cleanup_module(void)
{
iscsit_release_discovery_tpg();
iscsit_unregister_transport(&iscsi_target_transport);
kmem_cache_destroy(lio_qr_cache);
kmem_cache_destroy(lio_dr_cache);
kmem_cache_destroy(lio_ooo_cache);
kmem_cache_destroy(lio_r2t_cache);
/*
* Shutdown discovery sessions and disable discovery TPG
*/
if (iscsit_global->discovery_tpg)
iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
target_unregister_template(&iscsi_ops);
vfree(iscsit_global->ts_bitmap);
kfree(iscsit_global);
}
int iscsit_add_reject(
struct iscsi_conn *conn,
u8 reason,
unsigned char *buf)
{
struct iscsi_cmd *cmd;
cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
if (!cmd)
return -1;
cmd->iscsi_opcode = ISCSI_OP_REJECT;
cmd->reject_reason = reason;
cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
if (!cmd->buf_ptr) {
pr_err("Unable to allocate memory for cmd->buf_ptr\n");
iscsit_free_cmd(cmd, false);
return -1;
}
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
spin_unlock_bh(&conn->cmd_lock);
cmd->i_state = ISTATE_SEND_REJECT;
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
return -1;
}
EXPORT_SYMBOL(iscsit_add_reject);
static int iscsit_add_reject_from_cmd(
struct iscsi_cmd *cmd,
u8 reason,
bool add_to_conn,
unsigned char *buf)
{
struct iscsi_conn *conn;
const bool do_put = cmd->se_cmd.se_tfo != NULL;
if (!cmd->conn) {
pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
cmd->init_task_tag);
return -1;
}
conn = cmd->conn;
cmd->iscsi_opcode = ISCSI_OP_REJECT;
cmd->reject_reason = reason;
cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
if (!cmd->buf_ptr) {
pr_err("Unable to allocate memory for cmd->buf_ptr\n");
iscsit_free_cmd(cmd, false);
return -1;
}
if (add_to_conn) {
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
spin_unlock_bh(&conn->cmd_lock);
}
cmd->i_state = ISTATE_SEND_REJECT;
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
/*
* Perform the kref_put now if se_cmd has already been setup by
* scsit_setup_scsi_cmd()
*/
if (do_put) {
pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
target_put_sess_cmd(&cmd->se_cmd);
}
return -1;
}
static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
unsigned char *buf)
{
return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
}
int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
{
return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
}
EXPORT_SYMBOL(iscsit_reject_cmd);
/*
* Map some portion of the allocated scatterlist to an iovec, suitable for
* kernel sockets to copy data in/out.
*/
static int iscsit_map_iovec(struct iscsi_cmd *cmd, struct kvec *iov, int nvec,
u32 data_offset, u32 data_length)
{
u32 i = 0, orig_data_length = data_length;
struct scatterlist *sg;
unsigned int page_off;
/*
* We know each entry in t_data_sg contains a page.
*/
u32 ent = data_offset / PAGE_SIZE;
if (!data_length)
return 0;
if (ent >= cmd->se_cmd.t_data_nents) {
pr_err("Initial page entry out-of-bounds\n");
goto overflow;
}
sg = &cmd->se_cmd.t_data_sg[ent];
page_off = (data_offset % PAGE_SIZE);
cmd->first_data_sg = sg;
cmd->first_data_sg_off = page_off;
while (data_length) {
u32 cur_len;
if (WARN_ON_ONCE(!sg || i >= nvec))
goto overflow;
cur_len = min_t(u32, data_length, sg->length - page_off);
iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
iov[i].iov_len = cur_len;
data_length -= cur_len;
page_off = 0;
sg = sg_next(sg);
i++;
}
cmd->kmapped_nents = i;
return i;
overflow:
pr_err("offset %d + length %d overflow; %d/%d; sg-list:\n",
data_offset, orig_data_length, i, nvec);
for_each_sg(cmd->se_cmd.t_data_sg, sg,
cmd->se_cmd.t_data_nents, i) {
pr_err("[%d] off %d len %d\n",
i, sg->offset, sg->length);
}
return -1;
}
static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
{
u32 i;
struct scatterlist *sg;
sg = cmd->first_data_sg;
for (i = 0; i < cmd->kmapped_nents; i++)
kunmap(sg_page(&sg[i]));
}
static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
{
LIST_HEAD(ack_list);
struct iscsi_cmd *cmd, *cmd_p;
conn->exp_statsn = exp_statsn;
if (conn->sess->sess_ops->RDMAExtensions)
return;
spin_lock_bh(&conn->cmd_lock);
list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
spin_lock(&cmd->istate_lock);
if ((cmd->i_state == ISTATE_SENT_STATUS) &&
iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
cmd->i_state = ISTATE_REMOVE;
spin_unlock(&cmd->istate_lock);
list_move_tail(&cmd->i_conn_node, &ack_list);
continue;
}
spin_unlock(&cmd->istate_lock);
}
spin_unlock_bh(&conn->cmd_lock);
list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
list_del_init(&cmd->i_conn_node);
iscsit_free_cmd(cmd, false);
}
}
static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
{
u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
iov_count += ISCSI_IOV_DATA_BUFFER;
cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
if (!cmd->iov_data)
return -ENOMEM;
cmd->orig_iov_data_count = iov_count;
return 0;
}
int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
unsigned char *buf)
{
int data_direction, payload_length;
struct iscsi_scsi_req *hdr;
int iscsi_task_attr;
int sam_task_attr;
atomic_long_inc(&conn->sess->cmd_pdus);
hdr = (struct iscsi_scsi_req *) buf;
payload_length = ntoh24(hdr->dlength);
/* FIXME; Add checks for AdditionalHeaderSegment */
if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
" not set. Bad iSCSI Initiator.\n");
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_INVALID, buf);
}
if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
(hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
/*
* From RFC-3720 Section 10.3.1:
*
* "Either or both of R and W MAY be 1 when either the
* Expected Data Transfer Length and/or Bidirectional Read
* Expected Data Transfer Length are 0"
*
* For this case, go ahead and clear the unnecssary bits
* to avoid any confusion with ->data_direction.
*/
hdr->flags &= ~ISCSI_FLAG_CMD_READ;
hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
" set when Expected Data Transfer Length is 0 for"
" CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
}
if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
" MUST be set if Expected Data Transfer Length is not 0."
" Bad iSCSI Initiator\n");
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_INVALID, buf);
}
if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
(hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
pr_err("Bidirectional operations not supported!\n");
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_INVALID, buf);
}
if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
pr_err("Illegally set Immediate Bit in iSCSI Initiator"
" Scsi Command PDU.\n");
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_INVALID, buf);
}
if (payload_length && !conn->sess->sess_ops->ImmediateData) {
pr_err("ImmediateData=No but DataSegmentLength=%u,"
" protocol error.\n", payload_length);
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_PROTOCOL_ERROR, buf);
}
if ((be32_to_cpu(hdr->data_length) == payload_length) &&
(!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
pr_err("Expected Data Transfer Length and Length of"
" Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
" bit is not set protocol error\n");
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_PROTOCOL_ERROR, buf);
}
if (payload_length > be32_to_cpu(hdr->data_length)) {
pr_err("DataSegmentLength: %u is greater than"
" EDTL: %u, protocol error.\n", payload_length,
hdr->data_length);
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_PROTOCOL_ERROR, buf);
}
if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
pr_err("DataSegmentLength: %u is greater than"
" MaxXmitDataSegmentLength: %u, protocol error.\n",
payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_PROTOCOL_ERROR, buf);
}
if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
pr_err("DataSegmentLength: %u is greater than"
" FirstBurstLength: %u, protocol error.\n",
payload_length, conn->sess->sess_ops->FirstBurstLength);
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_INVALID, buf);
}
data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
(hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
DMA_NONE;
cmd->data_direction = data_direction;
iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
/*
* Figure out the SAM Task Attribute for the incoming SCSI CDB
*/
if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
(iscsi_task_attr == ISCSI_ATTR_SIMPLE))
sam_task_attr = TCM_SIMPLE_TAG;
else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
sam_task_attr = TCM_ORDERED_TAG;
else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
sam_task_attr = TCM_HEAD_TAG;
else if (iscsi_task_attr == ISCSI_ATTR_ACA)
sam_task_attr = TCM_ACA_TAG;
else {
pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
" TCM_SIMPLE_TAG\n", iscsi_task_attr);
sam_task_attr = TCM_SIMPLE_TAG;
}
cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
cmd->i_state = ISTATE_NEW_CMD;
cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
cmd->immediate_data = (payload_length) ? 1 : 0;
cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
(hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
if (cmd->unsolicited_data)
cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
if (hdr->flags & ISCSI_FLAG_CMD_READ)
cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
else
cmd->targ_xfer_tag = 0xFFFFFFFF;
cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
cmd->first_burst_len = payload_length;
if (!conn->sess->sess_ops->RDMAExtensions &&
cmd->data_direction == DMA_FROM_DEVICE) {
struct iscsi_datain_req *dr;
dr = iscsit_allocate_datain_req();
if (!dr)
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
iscsit_attach_datain_req(cmd, dr);
}
/*
* Initialize struct se_cmd descriptor from target_core_mod infrastructure
*/
transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
conn->sess->se_sess, be32_to_cpu(hdr->data_length),
cmd->data_direction, sam_task_attr,
cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun));
pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
" ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
conn->cid);
target_get_sess_cmd(&cmd->se_cmd, true);
cmd->sense_reason = target_cmd_init_cdb(&cmd->se_cmd, hdr->cdb);
if (cmd->sense_reason) {
if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
}
goto attach_cmd;
}
cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd);
if (cmd->sense_reason)
goto attach_cmd;
/* only used for printks or comparing with ->ref_task_tag */
cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
cmd->sense_reason = target_cmd_parse_cdb(&cmd->se_cmd);
if (cmd->sense_reason)
goto attach_cmd;
if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
}
attach_cmd:
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
spin_unlock_bh(&conn->cmd_lock);
/*
* Check if we need to delay processing because of ALUA
* Active/NonOptimized primary access state..
*/
core_alua_check_nonop_delay(&cmd->se_cmd);
return 0;
}
EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
void iscsit_set_unsolicited_dataout(struct iscsi_cmd *cmd)
{
iscsit_set_dataout_sequence_values(cmd);
spin_lock_bh(&cmd->dataout_timeout_lock);
iscsit_start_dataout_timer(cmd, cmd->conn);
spin_unlock_bh(&cmd->dataout_timeout_lock);
}
EXPORT_SYMBOL(iscsit_set_unsolicited_dataout);
int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
struct iscsi_scsi_req *hdr)
{
int cmdsn_ret = 0;
/*
* Check the CmdSN against ExpCmdSN/MaxCmdSN here if
* the Immediate Bit is not set, and no Immediate
* Data is attached.
*
* A PDU/CmdSN carrying Immediate Data can only
* be processed after the DataCRC has passed.
* If the DataCRC fails, the CmdSN MUST NOT
* be acknowledged. (See below)
*/
if (!cmd->immediate_data) {
cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
(unsigned char *)hdr, hdr->cmdsn);
if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
return -1;
else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
target_put_sess_cmd(&cmd->se_cmd);
return 0;
}
}
iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
/*
* If no Immediate Data is attached, it's OK to return now.
*/
if (!cmd->immediate_data) {
if (!cmd->sense_reason && cmd->unsolicited_data)
iscsit_set_unsolicited_dataout(cmd);
if (!cmd->sense_reason)
return 0;
target_put_sess_cmd(&cmd->se_cmd);
return 0;
}
/*
* Early CHECK_CONDITIONs with ImmediateData never make it to command
* execution. These exceptions are processed in CmdSN order using
* iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
*/
if (cmd->sense_reason)
return 1;
/*
* Call directly into transport_generic_new_cmd() to perform
* the backend memory allocation.
*/
cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
if (cmd->sense_reason)
return 1;
return 0;
}
EXPORT_SYMBOL(iscsit_process_scsi_cmd);
static int
iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
bool dump_payload)
{
int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
int rc;
/*
* Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
*/
if (dump_payload) {
u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done,
cmd->first_burst_len);
pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n",
cmd->se_cmd.data_length, cmd->write_data_done,
cmd->first_burst_len, length);
rc = iscsit_dump_data_payload(cmd->conn, length, 1);
pr_debug("Finished dumping immediate data\n");
if (rc < 0)
immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER;
} else {
immed_ret = iscsit_handle_immediate_data(cmd, hdr,
cmd->first_burst_len);
}
if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
/*
* A PDU/CmdSN carrying Immediate Data passed
* DataCRC, check against ExpCmdSN/MaxCmdSN if
* Immediate Bit is not set.
*/
cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
(unsigned char *)hdr, hdr->cmdsn);
if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
return -1;
if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
target_put_sess_cmd(&cmd->se_cmd);
return 0;
} else if (cmd->unsolicited_data)
iscsit_set_unsolicited_dataout(cmd);
} else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
/*
* Immediate Data failed DataCRC and ERL>=1,
* silently drop this PDU and let the initiator
* plug the CmdSN gap.
*
* FIXME: Send Unsolicited NOPIN with reserved
* TTT here to help the initiator figure out
* the missing CmdSN, although they should be
* intelligent enough to determine the missing
* CmdSN and issue a retry to plug the sequence.
*/
cmd->i_state = ISTATE_REMOVE;
iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
} else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
return -1;
return 0;
}
static int
iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
unsigned char *buf)
{
struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
int rc, immed_data;
bool dump_payload = false;
rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
if (rc < 0)
return 0;
/*
* Allocation iovecs needed for struct socket operations for
* traditional iSCSI block I/O.
*/
if (iscsit_allocate_iovecs(cmd) < 0) {
return iscsit_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
}
immed_data = cmd->immediate_data;
rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
if (rc < 0)
return rc;
else if (rc > 0)
dump_payload = true;
if (!immed_data)
return 0;
return iscsit_get_immediate_data(cmd, hdr, dump_payload);
}
static u32 iscsit_do_crypto_hash_sg(
struct ahash_request *hash,
struct iscsi_cmd *cmd,
u32 data_offset,
u32 data_length,
u32 padding,
u8 *pad_bytes)
{
u32 data_crc;
struct scatterlist *sg;
unsigned int page_off;
crypto_ahash_init(hash);
sg = cmd->first_data_sg;
page_off = cmd->first_data_sg_off;
while (data_length) {
u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
ahash_request_set_crypt(hash, sg, NULL, cur_len);
crypto_ahash_update(hash);
data_length -= cur_len;
page_off = 0;
/* iscsit_map_iovec has already checked for invalid sg pointers */
sg = sg_next(sg);
}
if (padding) {
struct scatterlist pad_sg;
sg_init_one(&pad_sg, pad_bytes, padding);
ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
padding);
crypto_ahash_finup(hash);
} else {
ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
crypto_ahash_final(hash);
}
return data_crc;
}
static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
const void *buf, u32 payload_length, u32 padding,
const void *pad_bytes, void *data_crc)
{
struct scatterlist sg[2];
sg_init_table(sg, ARRAY_SIZE(sg));
sg_set_buf(sg, buf, payload_length);
if (padding)
sg_set_buf(sg + 1, pad_bytes, padding);
ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
crypto_ahash_digest(hash);
}
int
__iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
struct iscsi_cmd *cmd, u32 payload_length,
bool *success)
{
struct iscsi_data *hdr = buf;
struct se_cmd *se_cmd;
int rc;
/* iSCSI write */
atomic_long_add(payload_length, &conn->sess->rx_data_octets);
pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
" DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
payload_length, conn->cid);
if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
pr_err("Command ITT: 0x%08x received DataOUT after"
" last DataOUT received, dumping payload\n",
cmd->init_task_tag);
return iscsit_dump_data_payload(conn, payload_length, 1);
}
if (cmd->data_direction != DMA_TO_DEVICE) {
pr_err("Command ITT: 0x%08x received DataOUT for a"
" NON-WRITE command.\n", cmd->init_task_tag);
return iscsit_dump_data_payload(conn, payload_length, 1);
}
se_cmd = &cmd->se_cmd;
iscsit_mod_dataout_timer(cmd);
if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
be32_to_cpu(hdr->offset), payload_length,
cmd->se_cmd.data_length);
return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
}
if (cmd->unsolicited_data) {
int dump_unsolicited_data = 0;
if (conn->sess->sess_ops->InitialR2T) {
pr_err("Received unexpected unsolicited data"
" while InitialR2T=Yes, protocol error.\n");
transport_send_check_condition_and_sense(&cmd->se_cmd,
TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
return -1;
}
/*
* Special case for dealing with Unsolicited DataOUT
* and Unsupported SAM WRITE Opcodes and SE resource allocation
* failures;
*/
/* Something's amiss if we're not in WRITE_PENDING state... */
WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
dump_unsolicited_data = 1;
if (dump_unsolicited_data) {
/*
* Check if a delayed TASK_ABORTED status needs to
* be sent now if the ISCSI_FLAG_CMD_FINAL has been
* received with the unsolicited data out.
*/
if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
iscsit_stop_dataout_timer(cmd);
return iscsit_dump_data_payload(conn, payload_length, 1);
}
} else {
/*
* For the normal solicited data path:
*
* Check for a delayed TASK_ABORTED status and dump any
* incoming data out payload if one exists. Also, when the
* ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
* data out sequence, we decrement outstanding_r2ts. Once
* outstanding_r2ts reaches zero, go ahead and send the delayed
* TASK_ABORTED status.
*/
if (se_cmd->transport_state & CMD_T_ABORTED) {
if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
--cmd->outstanding_r2ts < 1)
iscsit_stop_dataout_timer(cmd);
return iscsit_dump_data_payload(conn, payload_length, 1);
}
}
/*
* Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
* within-command recovery checks before receiving the payload.
*/
rc = iscsit_check_pre_dataout(cmd, buf);
if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
return 0;
else if (rc == DATAOUT_CANNOT_RECOVER)
return -1;
*success = true;
return 0;
}
EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
int
iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
struct iscsi_cmd **out_cmd)
{
struct iscsi_data *hdr = buf;
struct iscsi_cmd *cmd;
u32 payload_length = ntoh24(hdr->dlength);
int rc;
bool success = false;
if (!payload_length) {
pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
return 0;
}
if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
pr_err_ratelimited("DataSegmentLength: %u is greater than"
" MaxXmitDataSegmentLength: %u\n", payload_length,
conn->conn_ops->MaxXmitDataSegmentLength);
return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
}
cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
if (!cmd)
return 0;
rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
if (success)
*out_cmd = cmd;
return rc;
}
EXPORT_SYMBOL(iscsit_check_dataout_hdr);
static int
iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
struct iscsi_data *hdr)
{
struct kvec *iov;
u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
u32 payload_length;
int iov_ret, data_crc_failed = 0;
payload_length = min_t(u32, cmd->se_cmd.data_length,
ntoh24(hdr->dlength));
rx_size += payload_length;
iov = &cmd->iov_data[0];
iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2,
be32_to_cpu(hdr->offset), payload_length);
if (iov_ret < 0)
return -1;
iov_count += iov_ret;
padding = ((-payload_length) & 3);
if (padding != 0) {
iov[iov_count].iov_base = cmd->pad_bytes;
iov[iov_count++].iov_len = padding;
rx_size += padding;
pr_debug("Receiving %u padding bytes.\n", padding);
}
if (conn->conn_ops->DataDigest) {
iov[iov_count].iov_base = &checksum;
iov[iov_count++].iov_len = ISCSI_CRC_LEN;
rx_size += ISCSI_CRC_LEN;
}
WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
iscsit_unmap_iovec(cmd);
if (rx_got != rx_size)
return -1;
if (conn->conn_ops->DataDigest) {
u32 data_crc;
data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
be32_to_cpu(hdr->offset),
payload_length, padding,
cmd->pad_bytes);
if (checksum != data_crc) {
pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
" DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
" does not match computed 0x%08x\n",
hdr->itt, hdr->offset, payload_length,
hdr->datasn, checksum, data_crc);
data_crc_failed = 1;
} else {
pr_debug("Got CRC32C DataDigest 0x%08x for"
" %u bytes of Data Out\n", checksum,
payload_length);
}
}
return data_crc_failed;
}
int
iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
bool data_crc_failed)
{
struct iscsi_conn *conn = cmd->conn;
int rc, ooo_cmdsn;
/*
* Increment post receive data and CRC values or perform
* within-command recovery.
*/
rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
return 0;
else if (rc == DATAOUT_SEND_R2T) {
iscsit_set_dataout_sequence_values(cmd);
conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
} else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
/*
* Handle extra special case for out of order
* Unsolicited Data Out.
*/
spin_lock_bh(&cmd->istate_lock);
ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
spin_unlock_bh(&cmd->istate_lock);
iscsit_stop_dataout_timer(cmd);
if (ooo_cmdsn)
return 0;
target_execute_cmd(&cmd->se_cmd);
return 0;
} else /* DATAOUT_CANNOT_RECOVER */
return -1;
return 0;
}
EXPORT_SYMBOL(iscsit_check_dataout_payload);
static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
{
struct iscsi_cmd *cmd = NULL;
struct iscsi_data *hdr = (struct iscsi_data *)buf;
int rc;
bool data_crc_failed = false;
rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
if (rc < 0)
return 0;
else if (!cmd)
return 0;
rc = iscsit_get_dataout(conn, cmd, hdr);
if (rc < 0)
return rc;
else if (rc > 0)
data_crc_failed = true;
return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
}
int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
struct iscsi_nopout *hdr)
{
u32 payload_length = ntoh24(hdr->dlength);
if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
if (!cmd)
return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
(unsigned char *)hdr);
return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
(unsigned char *)hdr);
}
if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
" not set, protocol error.\n");
if (!cmd)
return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
(unsigned char *)hdr);
return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
(unsigned char *)hdr);
}
if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
" greater than MaxXmitDataSegmentLength: %u, protocol"
" error.\n", payload_length,
conn->conn_ops->MaxXmitDataSegmentLength);
if (!cmd)
return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
(unsigned char *)hdr);
return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
(unsigned char *)hdr);
}
pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
" CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
hdr->itt == RESERVED_ITT ? "Response" : "Request",
hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
payload_length);
/*
* This is not a response to a Unsolicited NopIN, which means
* it can either be a NOPOUT ping request (with a valid ITT),
* or a NOPOUT not requesting a NOPIN (with a reserved ITT).
* Either way, make sure we allocate an struct iscsi_cmd, as both
* can contain ping data.
*/
if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
cmd->i_state = ISTATE_SEND_NOPIN;
cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1 : 0);
conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
cmd->targ_xfer_tag = 0xFFFFFFFF;
cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
cmd->data_direction = DMA_NONE;
}
return 0;
}
EXPORT_SYMBOL(iscsit_setup_nop_out);
int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
struct iscsi_nopout *hdr)
{
struct iscsi_cmd *cmd_p = NULL;
int cmdsn_ret = 0;
/*
* Initiator is expecting a NopIN ping reply..
*/
if (hdr->itt != RESERVED_ITT) {
if (!cmd)
return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
(unsigned char *)hdr);
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
spin_unlock_bh(&conn->cmd_lock);
iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
iscsit_add_cmd_to_response_queue(cmd, conn,
cmd->i_state);
return 0;
}
cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
(unsigned char *)hdr, hdr->cmdsn);
if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
return 0;
if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
return -1;
return 0;
}
/*
* This was a response to a unsolicited NOPIN ping.
*/
if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
if (!cmd_p)
return -EINVAL;
iscsit_stop_nopin_response_timer(conn);
cmd_p->i_state = ISTATE_REMOVE;
iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
iscsit_start_nopin_timer(conn);
return 0;
}
/*
* Otherwise, initiator is not expecting a NOPIN is response.
* Just ignore for now.
*/
if (cmd)
iscsit_free_cmd(cmd, false);
return 0;
}
EXPORT_SYMBOL(iscsit_process_nop_out);
static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
unsigned char *buf)
{
unsigned char *ping_data = NULL;
struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
struct kvec *iov = NULL;
u32 payload_length = ntoh24(hdr->dlength);
int ret;
ret = iscsit_setup_nop_out(conn, cmd, hdr);
if (ret < 0)
return 0;
/*
* Handle NOP-OUT payload for traditional iSCSI sockets
*/
if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
u32 checksum, data_crc, padding = 0;
int niov = 0, rx_got, rx_size = payload_length;
ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
if (!ping_data) {
ret = -1;
goto out;
}
iov = &cmd->iov_misc[0];
iov[niov].iov_base = ping_data;
iov[niov++].iov_len = payload_length;
padding = ((-payload_length) & 3);
if (padding != 0) {
pr_debug("Receiving %u additional bytes"
" for padding.\n", padding);
iov[niov].iov_base = &cmd->pad_bytes;
iov[niov++].iov_len = padding;
rx_size += padding;
}
if (conn->conn_ops->DataDigest) {
iov[niov].iov_base = &checksum;
iov[niov++].iov_len = ISCSI_CRC_LEN;
rx_size += ISCSI_CRC_LEN;
}
WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc));
rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
if (rx_got != rx_size) {
ret = -1;
goto out;
}
if (conn->conn_ops->DataDigest) {
iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
payload_length, padding,
cmd->pad_bytes, &data_crc);
if (checksum != data_crc) {
pr_err("Ping data CRC32C DataDigest"
" 0x%08x does not match computed 0x%08x\n",
checksum, data_crc);
if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
pr_err("Unable to recover from"
" NOPOUT Ping DataCRC failure while in"
" ERL=0.\n");
ret = -1;
goto out;
} else {
/*
* Silently drop this PDU and let the
* initiator plug the CmdSN gap.
*/
pr_debug("Dropping NOPOUT"
" Command CmdSN: 0x%08x due to"
" DataCRC error.\n", hdr->cmdsn);
ret = 0;
goto out;
}
} else {
pr_debug("Got CRC32C DataDigest"
" 0x%08x for %u bytes of ping data.\n",
checksum, payload_length);
}
}
ping_data[payload_length] = '\0';
/*
* Attach ping data to struct iscsi_cmd->buf_ptr.
*/
cmd->buf_ptr = ping_data;
cmd->buf_ptr_size = payload_length;
pr_debug("Got %u bytes of NOPOUT ping"
" data.\n", payload_length);
pr_debug("Ping Data: \"%s\"\n", ping_data);
}
return iscsit_process_nop_out(conn, cmd, hdr);
out:
if (cmd)
iscsit_free_cmd(cmd, false);
kfree(ping_data);
return ret;
}
static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
{
switch (iscsi_tmf) {
case ISCSI_TM_FUNC_ABORT_TASK:
return TMR_ABORT_TASK;
case ISCSI_TM_FUNC_ABORT_TASK_SET:
return TMR_ABORT_TASK_SET;
case ISCSI_TM_FUNC_CLEAR_ACA:
return TMR_CLEAR_ACA;
case ISCSI_TM_FUNC_CLEAR_TASK_SET:
return TMR_CLEAR_TASK_SET;
case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
return TMR_LUN_RESET;
case ISCSI_TM_FUNC_TARGET_WARM_RESET:
return TMR_TARGET_WARM_RESET;
case ISCSI_TM_FUNC_TARGET_COLD_RESET:
return TMR_TARGET_COLD_RESET;
default:
return TMR_UNKNOWN;
}
}
int
iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
unsigned char *buf)
{
struct se_tmr_req *se_tmr;
struct iscsi_tmr_req *tmr_req;
struct iscsi_tm *hdr;
int out_of_order_cmdsn = 0, ret;
u8 function, tcm_function = TMR_UNKNOWN;
hdr = (struct iscsi_tm *) buf;
hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
function = hdr->flags;
pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
" 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
" 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
hdr->rtt, hdr->refcmdsn, conn->cid);
if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
hdr->rtt != RESERVED_ITT)) {
pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
hdr->rtt = RESERVED_ITT;
}
if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
pr_err("Task Management Request TASK_REASSIGN not"
" issued as immediate command, bad iSCSI Initiator"
"implementation\n");
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_PROTOCOL_ERROR, buf);
}
if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
cmd->data_direction = DMA_NONE;
cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
if (!cmd->tmr_req) {
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_NO_RESOURCES,
buf);
}
transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
conn->sess->se_sess, 0, DMA_NONE,
TCM_SIMPLE_TAG, cmd->sense_buffer + 2,
scsilun_to_int(&hdr->lun));
target_get_sess_cmd(&cmd->se_cmd, true);
/*
* TASK_REASSIGN for ERL=2 / connection stays inside of
* LIO-Target $FABRIC_MOD
*/
if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
tcm_function = iscsit_convert_tmf(function);
if (tcm_function == TMR_UNKNOWN) {
pr_err("Unknown iSCSI TMR Function:"
" 0x%02x\n", function);
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
}
}
ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
GFP_KERNEL);
if (ret < 0)
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
cmd->i_state = ISTATE_SEND_TASKMGTRSP;
cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
cmd->init_task_tag = hdr->itt;
cmd->targ_xfer_tag = 0xFFFFFFFF;
cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
se_tmr = cmd->se_cmd.se_tmr_req;
tmr_req = cmd->tmr_req;
/*
* Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
*/
if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
ret = transport_lookup_tmr_lun(&cmd->se_cmd);
if (ret < 0) {
se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
goto attach;
}
}
switch (function) {
case ISCSI_TM_FUNC_ABORT_TASK:
se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
if (se_tmr->response)
goto attach;
break;
case ISCSI_TM_FUNC_ABORT_TASK_SET:
case ISCSI_TM_FUNC_CLEAR_ACA:
case ISCSI_TM_FUNC_CLEAR_TASK_SET:
case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
break;
case ISCSI_TM_FUNC_TARGET_WARM_RESET:
if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
goto attach;
}
break;
case ISCSI_TM_FUNC_TARGET_COLD_RESET:
if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
goto attach;
}
break;
case ISCSI_TM_FUNC_TASK_REASSIGN:
se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
/*
* Perform sanity checks on the ExpDataSN only if the
* TASK_REASSIGN was successful.
*/
if (se_tmr->response)
break;
if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_INVALID, buf);
break;
default:
pr_err("Unknown TMR function: 0x%02x, protocol"
" error.\n", function);
se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
goto attach;
}
if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
(se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
se_tmr->call_transport = 1;
attach:
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
spin_unlock_bh(&conn->cmd_lock);
if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
out_of_order_cmdsn = 1;
} else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
target_put_sess_cmd(&cmd->se_cmd);
return 0;
} else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
return -1;
}
}
iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
return 0;
/*
* Found the referenced task, send to transport for processing.
*/
if (se_tmr->call_transport)
return transport_generic_handle_tmr(&cmd->se_cmd);
/*
* Could not find the referenced LUN, task, or Task Management
* command not authorized or supported. Change state and
* let the tx_thread send the response.
*
* For connection recovery, this is also the default action for
* TMR TASK_REASSIGN.
*/
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
target_put_sess_cmd(&cmd->se_cmd);
return 0;
}
EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
/* #warning FIXME: Support Text Command parameters besides SendTargets */
int
iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
struct iscsi_text *hdr)
{
u32 payload_length = ntoh24(hdr->dlength);
if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
pr_err("Unable to accept text parameter length: %u"
"greater than MaxXmitDataSegmentLength %u.\n",
payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
(unsigned char *)hdr);
}
if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
pr_err("Multi sequence text commands currently not supported\n");
return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
(unsigned char *)hdr);
}
pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
" ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
hdr->exp_statsn, payload_length);
cmd->iscsi_opcode = ISCSI_OP_TEXT;
cmd->i_state = ISTATE_SEND_TEXTRSP;
cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
cmd->targ_xfer_tag = 0xFFFFFFFF;
cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
cmd->data_direction = DMA_NONE;
kfree(cmd->text_in_ptr);
cmd->text_in_ptr = NULL;
return 0;
}
EXPORT_SYMBOL(iscsit_setup_text_cmd);
int
iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
struct iscsi_text *hdr)
{
unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
int cmdsn_ret;
if (!text_in) {
cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
pr_err("Unable to locate text_in buffer for sendtargets"
" discovery\n");
goto reject;
}
goto empty_sendtargets;
}
if (strncmp("SendTargets=", text_in, 12) != 0) {
pr_err("Received Text Data that is not"
" SendTargets, cannot continue.\n");
goto reject;
}
/* '=' confirmed in strncmp */
text_ptr = strchr(text_in, '=');
BUG_ON(!text_ptr);
if (!strncmp("=All", text_ptr, 5)) {
cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
} else if (!strncmp("=iqn.", text_ptr, 5) ||
!strncmp("=eui.", text_ptr, 5)) {
cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
} else {
pr_err("Unable to locate valid SendTargets%s value\n",
text_ptr);
goto reject;
}
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
spin_unlock_bh(&conn->cmd_lock);
empty_sendtargets:
iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
(unsigned char *)hdr, hdr->cmdsn);
if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
return -1;
return 0;
}
return iscsit_execute_cmd(cmd, 0);
reject:
return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
(unsigned char *)hdr);
}
EXPORT_SYMBOL(iscsit_process_text_cmd);
static int
iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
unsigned char *buf)
{
struct iscsi_text *hdr = (struct iscsi_text *)buf;
char *text_in = NULL;
u32 payload_length = ntoh24(hdr->dlength);
int rx_size, rc;
rc = iscsit_setup_text_cmd(conn, cmd, hdr);
if (rc < 0)
return 0;
rx_size = payload_length;
if (payload_length) {
u32 checksum = 0, data_crc = 0;
u32 padding = 0;
int niov = 0, rx_got;
struct kvec iov[2];
rx_size = ALIGN(payload_length, 4);
text_in = kzalloc(rx_size, GFP_KERNEL);
if (!text_in)
goto reject;
cmd->text_in_ptr = text_in;
memset(iov, 0, sizeof(iov));
iov[niov].iov_base = text_in;
iov[niov++].iov_len = rx_size;
padding = rx_size - payload_length;
if (padding)
pr_debug("Receiving %u additional bytes"
" for padding.\n", padding);
if (conn->conn_ops->DataDigest) {
iov[niov].iov_base = &checksum;
iov[niov++].iov_len = ISCSI_CRC_LEN;
rx_size += ISCSI_CRC_LEN;
}
WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
rx_got = rx_data(conn, &iov[0], niov, rx_size);
if (rx_got != rx_size)
goto reject;
if (conn->conn_ops->DataDigest) {
iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
text_in, rx_size, 0, NULL,
&data_crc);
if (checksum != data_crc) {
pr_err("Text data CRC32C DataDigest"
" 0x%08x does not match computed"
" 0x%08x\n", checksum, data_crc);
if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
pr_err("Unable to recover from"
" Text Data digest failure while in"
" ERL=0.\n");
goto reject;
} else {
/*
* Silently drop this PDU and let the
* initiator plug the CmdSN gap.
*/
pr_debug("Dropping Text"
" Command CmdSN: 0x%08x due to"
" DataCRC error.\n", hdr->cmdsn);
kfree(text_in);
return 0;
}
} else {
pr_debug("Got CRC32C DataDigest"
" 0x%08x for %u bytes of text data.\n",
checksum, payload_length);
}
}
text_in[payload_length - 1] = '\0';
pr_debug("Successfully read %d bytes of text"
" data.\n", payload_length);
}
return iscsit_process_text_cmd(conn, cmd, hdr);
reject:
kfree(cmd->text_in_ptr);
cmd->text_in_ptr = NULL;
return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
}
int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
{
struct iscsi_conn *conn_p;
struct iscsi_session *sess = conn->sess;
pr_debug("Received logout request CLOSESESSION on CID: %hu"
" for SID: %u.\n", conn->cid, conn->sess->sid);
atomic_set(&sess->session_logout, 1);
atomic_set(&conn->conn_logout_remove, 1);
conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
iscsit_inc_conn_usage_count(conn);
iscsit_inc_session_usage_count(sess);
spin_lock_bh(&sess->conn_lock);
list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
continue;
pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
}
spin_unlock_bh(&sess->conn_lock);
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
return 0;
}
int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
{
struct iscsi_conn *l_conn;
struct iscsi_session *sess = conn->sess;
pr_debug("Received logout request CLOSECONNECTION for CID:"
" %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
/*
* A Logout Request with a CLOSECONNECTION reason code for a CID
* can arrive on a connection with a differing CID.
*/
if (conn->cid == cmd->logout_cid) {
spin_lock_bh(&conn->state_lock);
pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
atomic_set(&conn->conn_logout_remove, 1);
conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
iscsit_inc_conn_usage_count(conn);
spin_unlock_bh(&conn->state_lock);
} else {
/*
* Handle all different cid CLOSECONNECTION requests in
* iscsit_logout_post_handler_diffcid() as to give enough
* time for any non immediate command's CmdSN to be
* acknowledged on the connection in question.
*
* Here we simply make sure the CID is still around.
*/
l_conn = iscsit_get_conn_from_cid(sess,
cmd->logout_cid);
if (!l_conn) {
cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
iscsit_add_cmd_to_response_queue(cmd, conn,
cmd->i_state);
return 0;
}
iscsit_dec_conn_usage_count(l_conn);
}
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
return 0;
}
int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
{
struct iscsi_session *sess = conn->sess;
pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
" CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
if (sess->sess_ops->ErrorRecoveryLevel != 2) {
pr_err("Received Logout Request REMOVECONNFORRECOVERY"
" while ERL!=2.\n");
cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
return 0;
}
if (conn->cid == cmd->logout_cid) {
pr_err("Received Logout Request REMOVECONNFORRECOVERY"
" with CID: %hu on CID: %hu, implementation error.\n",
cmd->logout_cid, conn->cid);
cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
return 0;
}
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
return 0;
}
int
iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
unsigned char *buf)
{
int cmdsn_ret, logout_remove = 0;
u8 reason_code = 0;
struct iscsi_logout *hdr;
struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
hdr = (struct iscsi_logout *) buf;
reason_code = (hdr->flags & 0x7f);
if (tiqn) {
spin_lock(&tiqn->logout_stats.lock);
if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
tiqn->logout_stats.normal_logouts++;
else
tiqn->logout_stats.abnormal_logouts++;
spin_unlock(&tiqn->logout_stats.lock);
}
pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
" ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
hdr->cid, conn->cid);
if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
pr_err("Received logout request on connection that"
" is not in logged in state, ignoring request.\n");
iscsit_free_cmd(cmd, false);
return 0;
}
cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
cmd->i_state = ISTATE_SEND_LOGOUTRSP;
cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
cmd->targ_xfer_tag = 0xFFFFFFFF;
cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
cmd->logout_cid = be16_to_cpu(hdr->cid);
cmd->logout_reason = reason_code;
cmd->data_direction = DMA_NONE;
/*
* We need to sleep in these cases (by returning 1) until the Logout
* Response gets sent in the tx thread.
*/
if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
be16_to_cpu(hdr->cid) == conn->cid))
logout_remove = 1;
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
spin_unlock_bh(&conn->cmd_lock);
if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
/*
* Immediate commands are executed, well, immediately.
* Non-Immediate Logout Commands are executed in CmdSN order.
*/
if (cmd->immediate_cmd) {
int ret = iscsit_execute_cmd(cmd, 0);
if (ret < 0)
return ret;
} else {
cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
logout_remove = 0;
else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
return -1;
}
return logout_remove;
}
EXPORT_SYMBOL(iscsit_handle_logout_cmd);
int iscsit_handle_snack(
struct iscsi_conn *conn,
unsigned char *buf)
{
struct iscsi_snack *hdr;
hdr = (struct iscsi_snack *) buf;
hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
" 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
" CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
hdr->begrun, hdr->runlength, conn->cid);
if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
pr_err("Initiator sent SNACK request while in"
" ErrorRecoveryLevel=0.\n");
return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
buf);
}
/*
* SNACK_DATA and SNACK_R2T are both 0, so check which function to
* call from inside iscsi_send_recovery_datain_or_r2t().
*/
switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
case 0:
return iscsit_handle_recovery_datain_or_r2t(conn, buf,
hdr->itt,
be32_to_cpu(hdr->ttt),
be32_to_cpu(hdr->begrun),
be32_to_cpu(hdr->runlength));
case ISCSI_FLAG_SNACK_TYPE_STATUS:
return iscsit_handle_status_snack(conn, hdr->itt,
be32_to_cpu(hdr->ttt),
be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
be32_to_cpu(hdr->begrun),
be32_to_cpu(hdr->runlength));
case ISCSI_FLAG_SNACK_TYPE_RDATA:
/* FIXME: Support R-Data SNACK */
pr_err("R-Data SNACK Not Supported.\n");
return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
buf);
default:
pr_err("Unknown SNACK type 0x%02x, protocol"
" error.\n", hdr->flags & 0x0f);
return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
buf);
}
return 0;
}
EXPORT_SYMBOL(iscsit_handle_snack);
static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
{
if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
(conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
wait_for_completion_interruptible_timeout(
&conn->rx_half_close_comp,
ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
}
}
static int iscsit_handle_immediate_data(
struct iscsi_cmd *cmd,
struct iscsi_scsi_req *hdr,
u32 length)
{
int iov_ret, rx_got = 0, rx_size = 0;
u32 checksum, iov_count = 0, padding = 0;
struct iscsi_conn *conn = cmd->conn;
struct kvec *iov;
void *overflow_buf = NULL;
BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
cmd->orig_iov_data_count - 2,
cmd->write_data_done, rx_size);
if (iov_ret < 0)
return IMMEDIATE_DATA_CANNOT_RECOVER;
iov_count = iov_ret;
iov = &cmd->iov_data[0];
if (rx_size < length) {
/*
* Special case: length of immediate data exceeds the data
* buffer size derived from the CDB.
*/
overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
if (!overflow_buf) {
iscsit_unmap_iovec(cmd);
return IMMEDIATE_DATA_CANNOT_RECOVER;
}
cmd->overflow_buf = overflow_buf;
iov[iov_count].iov_base = overflow_buf;
iov[iov_count].iov_len = length - rx_size;
iov_count++;
rx_size = length;
}
padding = ((-length) & 3);
if (padding != 0) {
iov[iov_count].iov_base = cmd->pad_bytes;
iov[iov_count++].iov_len = padding;
rx_size += padding;
}
if (conn->conn_ops->DataDigest) {
iov[iov_count].iov_base = &checksum;
iov[iov_count++].iov_len = ISCSI_CRC_LEN;
rx_size += ISCSI_CRC_LEN;
}
WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
iscsit_unmap_iovec(cmd);
if (rx_got != rx_size) {
iscsit_rx_thread_wait_for_tcp(conn);
return IMMEDIATE_DATA_CANNOT_RECOVER;
}
if (conn->conn_ops->DataDigest) {
u32 data_crc;
data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
cmd->write_data_done, length, padding,
cmd->pad_bytes);
if (checksum != data_crc) {
pr_err("ImmediateData CRC32C DataDigest 0x%08x"
" does not match computed 0x%08x\n", checksum,
data_crc);
if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
pr_err("Unable to recover from"
" Immediate Data digest failure while"
" in ERL=0.\n");
iscsit_reject_cmd(cmd,
ISCSI_REASON_DATA_DIGEST_ERROR,
(unsigned char *)hdr);
return IMMEDIATE_DATA_CANNOT_RECOVER;
} else {
iscsit_reject_cmd(cmd,
ISCSI_REASON_DATA_DIGEST_ERROR,
(unsigned char *)hdr);
return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
}
} else {
pr_debug("Got CRC32C DataDigest 0x%08x for"
" %u bytes of Immediate Data\n", checksum,
length);
}
}
cmd->write_data_done += length;
if (cmd->write_data_done == cmd->se_cmd.data_length) {
spin_lock_bh(&cmd->istate_lock);
cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
spin_unlock_bh(&cmd->istate_lock);
}
return IMMEDIATE_DATA_NORMAL_OPERATION;
}
/* #warning iscsi_build_conn_drop_async_message() only sends out on connections
with active network interface */
static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
{
struct iscsi_cmd *cmd;
struct iscsi_conn *conn_p;
bool found = false;
lockdep_assert_held(&conn->sess->conn_lock);
/*
* Only send a Asynchronous Message on connections whos network
* interface is still functional.
*/
list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
iscsit_inc_conn_usage_count(conn_p);
found = true;
break;
}
}
if (!found)
return;
cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
if (!cmd) {
iscsit_dec_conn_usage_count(conn_p);
return;
}
cmd->logout_cid = conn->cid;
cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
cmd->i_state = ISTATE_SEND_ASYNCMSG;
spin_lock_bh(&conn_p->cmd_lock);
list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
spin_unlock_bh(&conn_p->cmd_lock);
iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
iscsit_dec_conn_usage_count(conn_p);
}
static int iscsit_send_conn_drop_async_message(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn)
{
struct iscsi_async *hdr;
cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
hdr = (struct iscsi_async *) cmd->pdu;
hdr->opcode = ISCSI_OP_ASYNC_EVENT;
hdr->flags = ISCSI_FLAG_CMD_FINAL;
cmd->init_task_tag = RESERVED_ITT;
cmd->targ_xfer_tag = 0xFFFFFFFF;
put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
cmd->stat_sn = conn->stat_sn++;
hdr->statsn = cpu_to_be32(cmd->stat_sn);
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
hdr->param1 = cpu_to_be16(cmd->logout_cid);
hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
pr_debug("Sending Connection Dropped Async Message StatSN:"
" 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
cmd->logout_cid, conn->cid);
return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
}
static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
{
if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
(conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
wait_for_completion_interruptible_timeout(
&conn->tx_half_close_comp,
ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
}
}
void
iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
bool set_statsn)
{
hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
hdr->flags = datain->flags;
if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
} else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
}
}
hton24(hdr->dlength, datain->length);
if (hdr->flags & ISCSI_FLAG_DATA_ACK)
int_to_scsilun(cmd->se_cmd.orig_fe_lun,
(struct scsi_lun *)&hdr->lun);
else
put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
hdr->itt = cmd->init_task_tag;
if (hdr->flags & ISCSI_FLAG_DATA_ACK)
hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
else
hdr->ttt = cpu_to_be32(0xFFFFFFFF);
if (set_statsn)
hdr->statsn = cpu_to_be32(cmd->stat_sn);
else
hdr->statsn = cpu_to_be32(0xFFFFFFFF);
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
hdr->datasn = cpu_to_be32(datain->data_sn);
hdr->offset = cpu_to_be32(datain->offset);
pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
" DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
ntohl(hdr->offset), datain->length, conn->cid);
}
EXPORT_SYMBOL(iscsit_build_datain_pdu);
static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
{
struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
struct iscsi_datain datain;
struct iscsi_datain_req *dr;
int eodr = 0, ret;
bool set_statsn = false;
memset(&datain, 0, sizeof(struct iscsi_datain));
dr = iscsit_get_datain_values(cmd, &datain);
if (!dr) {
pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
cmd->init_task_tag);
return -1;
}
/*
* Be paranoid and double check the logic for now.
*/
if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
pr_err("Command ITT: 0x%08x, datain.offset: %u and"
" datain.length: %u exceeds cmd->data_length: %u\n",
cmd->init_task_tag, datain.offset, datain.length,
cmd->se_cmd.data_length);
return -1;
}
atomic_long_add(datain.length, &conn->sess->tx_data_octets);
/*
* Special case for successfully execution w/ both DATAIN
* and Sense Data.
*/
if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
(cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
else {
if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
(dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
iscsit_increment_maxcmdsn(cmd, conn->sess);
cmd->stat_sn = conn->stat_sn++;
set_statsn = true;
} else if (dr->dr_complete ==
DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
set_statsn = true;
}
iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
if (ret < 0)
return ret;
if (dr->dr_complete) {
eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2 : 1;
iscsit_free_datain_req(cmd, dr);
}
return eodr;
}
int
iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
struct iscsi_logout_rsp *hdr)
{
struct iscsi_conn *logout_conn = NULL;
struct iscsi_conn_recovery *cr = NULL;
struct iscsi_session *sess = conn->sess;
/*
* The actual shutting down of Sessions and/or Connections
* for CLOSESESSION and CLOSECONNECTION Logout Requests
* is done in scsi_logout_post_handler().
*/
switch (cmd->logout_reason) {
case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
pr_debug("iSCSI session logout successful, setting"
" logout response to ISCSI_LOGOUT_SUCCESS.\n");
cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
break;
case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
break;
/*
* For CLOSECONNECTION logout requests carrying
* a matching logout CID -> local CID, the reference
* for the local CID will have been incremented in
* iscsi_logout_closeconnection().
*
* For CLOSECONNECTION logout requests carrying
* a different CID than the connection it arrived
* on, the connection responding to cmd->logout_cid
* is stopped in iscsit_logout_post_handler_diffcid().
*/
pr_debug("iSCSI CID: %hu logout on CID: %hu"
" successful.\n", cmd->logout_cid, conn->cid);
cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
break;
case ISCSI_LOGOUT_REASON_RECOVERY:
if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
(cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
break;
/*
* If the connection is still active from our point of view
* force connection recovery to occur.
*/
logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
cmd->logout_cid);
if (logout_conn) {
iscsit_connection_reinstatement_rcfr(logout_conn);
iscsit_dec_conn_usage_count(logout_conn);
}
cr = iscsit_get_inactive_connection_recovery_entry(
conn->sess, cmd->logout_cid);
if (!cr) {
pr_err("Unable to locate CID: %hu for"
" REMOVECONNFORRECOVERY Logout Request.\n",
cmd->logout_cid);
cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
break;
}
iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
" for recovery for CID: %hu on CID: %hu successful.\n",
cmd->logout_cid, conn->cid);
cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
break;
default:
pr_err("Unknown cmd->logout_reason: 0x%02x\n",
cmd->logout_reason);
return -1;
}
hdr->opcode = ISCSI_OP_LOGOUT_RSP;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
hdr->response = cmd->logout_response;
hdr->itt = cmd->init_task_tag;
cmd->stat_sn = conn->stat_sn++;
hdr->statsn = cpu_to_be32(cmd->stat_sn);
iscsit_increment_maxcmdsn(cmd, conn->sess);
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
" 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
cmd->init_task_tag, cmd->stat_sn, hdr->response,
cmd->logout_cid, conn->cid);
return 0;
}
EXPORT_SYMBOL(iscsit_build_logout_rsp);
static int
iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
{
int rc;
rc = iscsit_build_logout_rsp(cmd, conn,
(struct iscsi_logout_rsp *)&cmd->pdu[0]);
if (rc < 0)
return rc;
return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
}
void
iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
struct iscsi_nopin *hdr, bool nopout_response)
{
hdr->opcode = ISCSI_OP_NOOP_IN;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
hton24(hdr->dlength, cmd->buf_ptr_size);
if (nopout_response)
put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
hdr->itt = cmd->init_task_tag;
hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
conn->stat_sn;
hdr->statsn = cpu_to_be32(cmd->stat_sn);
if (nopout_response)
iscsit_increment_maxcmdsn(cmd, conn->sess);
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
" StatSN: 0x%08x, Length %u\n", (nopout_response) ?
"Solicited" : "Unsolicited", cmd->init_task_tag,
cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
}
EXPORT_SYMBOL(iscsit_build_nopin_rsp);
/*
* Unsolicited NOPIN, either requesting a response or not.
*/
static int iscsit_send_unsolicited_nopin(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn,
int want_response)
{
struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
int ret;
iscsit_build_nopin_rsp(cmd, conn, hdr, false);
pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
" 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
if (ret < 0)
return ret;
spin_lock_bh(&cmd->istate_lock);
cmd->i_state = want_response ?
ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
spin_unlock_bh(&cmd->istate_lock);
return 0;
}
static int
iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
{
struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
iscsit_build_nopin_rsp(cmd, conn, hdr, true);
/*
* NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
* NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
*/
pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
cmd->buf_ptr,
cmd->buf_ptr_size);
}
static int iscsit_send_r2t(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn)
{
struct iscsi_r2t *r2t;
struct iscsi_r2t_rsp *hdr;
int ret;
r2t = iscsit_get_r2t_from_list(cmd);
if (!r2t)
return -1;
hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
memset(hdr, 0, ISCSI_HDR_LEN);
hdr->opcode = ISCSI_OP_R2T;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
int_to_scsilun(cmd->se_cmd.orig_fe_lun,
(struct scsi_lun *)&hdr->lun);
hdr->itt = cmd->init_task_tag;
if (conn->conn_transport->iscsit_get_r2t_ttt)
conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
else
r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
hdr->statsn = cpu_to_be32(conn->stat_sn);
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
hdr->data_offset = cpu_to_be32(r2t->offset);
hdr->data_length = cpu_to_be32(r2t->xfer_len);
pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
" 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
(!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
r2t->offset, r2t->xfer_len, conn->cid);
spin_lock_bh(&cmd->r2t_lock);
r2t->sent_r2t = 1;
spin_unlock_bh(&cmd->r2t_lock);
ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
if (ret < 0) {
return ret;
}
spin_lock_bh(&cmd->dataout_timeout_lock);
iscsit_start_dataout_timer(cmd, conn);
spin_unlock_bh(&cmd->dataout_timeout_lock);
return 0;
}
/*
* @recovery: If called from iscsi_task_reassign_complete_write() for
* connection recovery.
*/
int iscsit_build_r2ts_for_cmd(
struct iscsi_conn *conn,
struct iscsi_cmd *cmd,
bool recovery)
{
int first_r2t = 1;
u32 offset = 0, xfer_len = 0;
spin_lock_bh(&cmd->r2t_lock);
if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
spin_unlock_bh(&cmd->r2t_lock);
return 0;
}
if (conn->sess->sess_ops->DataSequenceInOrder &&
!recovery)
cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
if (conn->sess->sess_ops->DataSequenceInOrder) {
offset = cmd->r2t_offset;
if (first_r2t && recovery) {
int new_data_end = offset +
conn->sess->sess_ops->MaxBurstLength -
cmd->next_burst_len;
if (new_data_end > cmd->se_cmd.data_length)
xfer_len = cmd->se_cmd.data_length - offset;
else
xfer_len =
conn->sess->sess_ops->MaxBurstLength -
cmd->next_burst_len;
} else {
int new_data_end = offset +
conn->sess->sess_ops->MaxBurstLength;
if (new_data_end > cmd->se_cmd.data_length)
xfer_len = cmd->se_cmd.data_length - offset;
else
xfer_len = conn->sess->sess_ops->MaxBurstLength;
}
if ((s32)xfer_len < 0) {
cmd->cmd_flags |= ICF_SENT_LAST_R2T;
break;
}
cmd->r2t_offset += xfer_len;
if (cmd->r2t_offset == cmd->se_cmd.data_length)
cmd->cmd_flags |= ICF_SENT_LAST_R2T;
} else {
struct iscsi_seq *seq;
seq = iscsit_get_seq_holder_for_r2t(cmd);
if (!seq) {
spin_unlock_bh(&cmd->r2t_lock);
return -1;
}
offset = seq->offset;
xfer_len = seq->xfer_len;
if (cmd->seq_send_order == cmd->seq_count)
cmd->cmd_flags |= ICF_SENT_LAST_R2T;
}
cmd->outstanding_r2ts++;
first_r2t = 0;
if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
spin_unlock_bh(&cmd->r2t_lock);
return -1;
}
if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
break;
}
spin_unlock_bh(&cmd->r2t_lock);
return 0;
}
EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
{
if (inc_stat_sn)
cmd->stat_sn = conn->stat_sn++;
atomic_long_inc(&conn->sess->rsp_pdus);
memset(hdr, 0, ISCSI_HDR_LEN);
hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
} else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
}
hdr->response = cmd->iscsi_response;
hdr->cmd_status = cmd->se_cmd.scsi_status;
hdr->itt = cmd->init_task_tag;
hdr->statsn = cpu_to_be32(cmd->stat_sn);
iscsit_increment_maxcmdsn(cmd, conn->sess);
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
" Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
cmd->se_cmd.scsi_status, conn->cid);
}
EXPORT_SYMBOL(iscsit_build_rsp_pdu);
static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
{
struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
void *data_buf = NULL;
u32 padding = 0, data_buf_len = 0;
iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
/*
* Attach SENSE DATA payload to iSCSI Response PDU
*/
if (cmd->se_cmd.sense_buffer &&
((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
(cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
cmd->se_cmd.scsi_sense_length += sizeof (__be16);
padding = -(cmd->se_cmd.scsi_sense_length) & 3;
hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
data_buf = cmd->sense_buffer;
data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
if (padding) {
memset(cmd->sense_buffer +
cmd->se_cmd.scsi_sense_length, 0, padding);
pr_debug("Adding %u bytes of padding to"
" SENSE.\n", padding);
}
pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
" Response PDU\n",
cmd->se_cmd.scsi_sense_length);
}
return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
data_buf_len);
}
static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
{
switch (se_tmr->response) {
case TMR_FUNCTION_COMPLETE:
return ISCSI_TMF_RSP_COMPLETE;
case TMR_TASK_DOES_NOT_EXIST:
return ISCSI_TMF_RSP_NO_TASK;
case TMR_LUN_DOES_NOT_EXIST:
return ISCSI_TMF_RSP_NO_LUN;
case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
return ISCSI_TMF_RSP_NOT_SUPPORTED;
case TMR_FUNCTION_REJECTED:
default:
return ISCSI_TMF_RSP_REJECTED;
}
}
void
iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
struct iscsi_tm_rsp *hdr)
{
struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
hdr->flags = ISCSI_FLAG_CMD_FINAL;
hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
hdr->itt = cmd->init_task_tag;
cmd->stat_sn = conn->stat_sn++;
hdr->statsn = cpu_to_be32(cmd->stat_sn);
iscsit_increment_maxcmdsn(cmd, conn->sess);
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
pr_debug("Built Task Management Response ITT: 0x%08x,"
" StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
}
EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
static int
iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
{
struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
iscsit_build_task_mgt_rsp(cmd, conn, hdr);
return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
}
#define SENDTARGETS_BUF_LIMIT 32768U
static int
iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
enum iscsit_transport_type network_transport,
int skip_bytes, bool *completed)
{
char *payload = NULL;
struct iscsi_conn *conn = cmd->conn;
struct iscsi_portal_group *tpg;
struct iscsi_tiqn *tiqn;
struct iscsi_tpg_np *tpg_np;
int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
int target_name_printed;
unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
bool active;
buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
SENDTARGETS_BUF_LIMIT);
payload = kzalloc(buffer_len, GFP_KERNEL);
if (!payload)
return -ENOMEM;
/*
* Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
* explicit case..
*/
if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
text_ptr = strchr(text_in, '=');
if (!text_ptr) {
pr_err("Unable to locate '=' string in text_in:"
" %s\n", text_in);
kfree(payload);
return -EINVAL;
}
/*
* Skip over '=' character..
*/
text_ptr += 1;
}
spin_lock(&tiqn_lock);
list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
strcmp(tiqn->tiqn, text_ptr)) {
continue;
}
target_name_printed = 0;
spin_lock(&tiqn->tiqn_tpg_lock);
list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
/* If demo_mode_discovery=0 and generate_node_acls=0
* (demo mode dislabed) do not return
* TargetName+TargetAddress unless a NodeACL exists.
*/
if ((tpg->tpg_attrib.generate_node_acls == 0) &&
(tpg->tpg_attrib.demo_mode_discovery == 0) &&
(!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
cmd->conn->sess->sess_ops->InitiatorName))) {
continue;
}
spin_lock(&tpg->tpg_state_lock);
active = (tpg->tpg_state == TPG_STATE_ACTIVE);
spin_unlock(&tpg->tpg_state_lock);
if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
continue;
spin_lock(&tpg->tpg_np_lock);
list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
tpg_np_list) {
struct iscsi_np *np = tpg_np->tpg_np;
struct sockaddr_storage *sockaddr;
if (np->np_network_transport != network_transport)
continue;
if (!target_name_printed) {
len = sprintf(buf, "TargetName=%s",
tiqn->tiqn);
len += 1;
if ((len + payload_len) > buffer_len) {
spin_unlock(&tpg->tpg_np_lock);
spin_unlock(&tiqn->tiqn_tpg_lock);
end_of_buf = 1;
goto eob;
}
if (skip_bytes && len <= skip_bytes) {
skip_bytes -= len;
} else {
memcpy(payload + payload_len, buf, len);
payload_len += len;
target_name_printed = 1;
if (len > skip_bytes)
skip_bytes = 0;
}
}
if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
sockaddr = &conn->local_sockaddr;
else
sockaddr = &np->np_sockaddr;
len = sprintf(buf, "TargetAddress="
"%pISpc,%hu",
sockaddr,
tpg->tpgt);
len += 1;
if ((len + payload_len) > buffer_len) {
spin_unlock(&tpg->tpg_np_lock);
spin_unlock(&tiqn->tiqn_tpg_lock);
end_of_buf = 1;
goto eob;
}
if (skip_bytes && len <= skip_bytes) {
skip_bytes -= len;
} else {
memcpy(payload + payload_len, buf, len);
payload_len += len;
if (len > skip_bytes)
skip_bytes = 0;
}
}
spin_unlock(&tpg->tpg_np_lock);
}
spin_unlock(&tiqn->tiqn_tpg_lock);
eob:
if (end_of_buf) {
*completed = false;
break;
}
if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
break;
}
spin_unlock(&tiqn_lock);
cmd->buf_ptr = payload;
return payload_len;
}
int
iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
struct iscsi_text_rsp *hdr,
enum iscsit_transport_type network_transport)
{
int text_length, padding;
bool completed = true;
text_length = iscsit_build_sendtargets_response(cmd, network_transport,
cmd->read_data_done,
&completed);
if (text_length < 0)
return text_length;
if (completed) {
hdr->flags = ISCSI_FLAG_CMD_FINAL;
} else {
hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
cmd->read_data_done += text_length;
if (cmd->targ_xfer_tag == 0xFFFFFFFF)
cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
}
hdr->opcode = ISCSI_OP_TEXT_RSP;
padding = ((-text_length) & 3);
hton24(hdr->dlength, text_length);
hdr->itt = cmd->init_task_tag;
hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
cmd->stat_sn = conn->stat_sn++;
hdr->statsn = cpu_to_be32(cmd->stat_sn);
iscsit_increment_maxcmdsn(cmd, conn->sess);
/*
* Reset maxcmdsn_inc in multi-part text payload exchanges to
* correctly increment MaxCmdSN for each response answering a
* non immediate text request with a valid CmdSN.
*/
cmd->maxcmdsn_inc = 0;
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
" Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
!!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
!!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
return text_length + padding;
}
EXPORT_SYMBOL(iscsit_build_text_rsp);
static int iscsit_send_text_rsp(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn)
{
struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
int text_length;
text_length = iscsit_build_text_rsp(cmd, conn, hdr,
conn->conn_transport->transport_type);
if (text_length < 0)
return text_length;
return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
cmd->buf_ptr,
text_length);
}
void
iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
struct iscsi_reject *hdr)
{
hdr->opcode = ISCSI_OP_REJECT;
hdr->reason = cmd->reject_reason;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
hton24(hdr->dlength, ISCSI_HDR_LEN);
hdr->ffffffff = cpu_to_be32(0xffffffff);
cmd->stat_sn = conn->stat_sn++;
hdr->statsn = cpu_to_be32(cmd->stat_sn);
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
}
EXPORT_SYMBOL(iscsit_build_reject);
static int iscsit_send_reject(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn)
{
struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
iscsit_build_reject(cmd, conn, hdr);
pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
" CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
cmd->buf_ptr,
ISCSI_HDR_LEN);
}
void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
{
int ord, cpu;
/*
* bitmap_id is assigned from iscsit_global->ts_bitmap from
* within iscsit_start_kthreads()
*
* Here we use bitmap_id to determine which CPU that this
* iSCSI connection's RX/TX threads will be scheduled to
* execute upon.
*/
ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
for_each_online_cpu(cpu) {
if (ord-- == 0) {
cpumask_set_cpu(cpu, conn->conn_cpumask);
return;
}
}
/*
* This should never be reached..
*/
dump_stack();
cpumask_setall(conn->conn_cpumask);
}
int
iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
{
int ret;
switch (state) {
case ISTATE_SEND_R2T:
ret = iscsit_send_r2t(cmd, conn);
if (ret < 0)
goto err;
break;
case ISTATE_REMOVE:
spin_lock_bh(&conn->cmd_lock);
list_del_init(&cmd->i_conn_node);
spin_unlock_bh(&conn->cmd_lock);
iscsit_free_cmd(cmd, false);
break;
case ISTATE_SEND_NOPIN_WANT_RESPONSE:
iscsit_mod_nopin_response_timer(conn);
ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
if (ret < 0)
goto err;
break;
case ISTATE_SEND_NOPIN_NO_RESPONSE:
ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
if (ret < 0)
goto err;
break;
default:
pr_err("Unknown Opcode: 0x%02x ITT:"
" 0x%08x, i_state: %d on CID: %hu\n",
cmd->iscsi_opcode, cmd->init_task_tag, state,
conn->cid);
goto err;
}
return 0;
err:
return -1;
}
EXPORT_SYMBOL(iscsit_immediate_queue);
static int
iscsit_handle_immediate_queue(struct iscsi_conn *conn)
{
struct iscsit_transport *t = conn->conn_transport;
struct iscsi_queue_req *qr;
struct iscsi_cmd *cmd;
u8 state;
int ret;
while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
atomic_set(&conn->check_immediate_queue, 0);
cmd = qr->cmd;
state = qr->state;
kmem_cache_free(lio_qr_cache, qr);
ret = t->iscsit_immediate_queue(conn, cmd, state);
if (ret < 0)
return ret;
}
return 0;
}
int
iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
{
int ret;
check_rsp_state:
switch (state) {
case ISTATE_SEND_DATAIN:
ret = iscsit_send_datain(cmd, conn);
if (ret < 0)
goto err;
else if (!ret)
/* more drs */
goto check_rsp_state;
else if (ret == 1) {
/* all done */
spin_lock_bh(&cmd->istate_lock);
cmd->i_state = ISTATE_SENT_STATUS;
spin_unlock_bh(&cmd->istate_lock);
if (atomic_read(&conn->check_immediate_queue))
return 1;
return 0;
} else if (ret == 2) {
/* Still must send status,
SCF_TRANSPORT_TASK_SENSE was set */
spin_lock_bh(&cmd->istate_lock);
cmd->i_state = ISTATE_SEND_STATUS;
spin_unlock_bh(&cmd->istate_lock);
state = ISTATE_SEND_STATUS;
goto check_rsp_state;
}
break;
case ISTATE_SEND_STATUS:
case ISTATE_SEND_STATUS_RECOVERY:
ret = iscsit_send_response(cmd, conn);
break;
case ISTATE_SEND_LOGOUTRSP:
ret = iscsit_send_logout(cmd, conn);
break;
case ISTATE_SEND_ASYNCMSG:
ret = iscsit_send_conn_drop_async_message(
cmd, conn);
break;
case ISTATE_SEND_NOPIN:
ret = iscsit_send_nopin(cmd, conn);
break;
case ISTATE_SEND_REJECT:
ret = iscsit_send_reject(cmd, conn);
break;
case ISTATE_SEND_TASKMGTRSP:
ret = iscsit_send_task_mgt_rsp(cmd, conn);
if (ret != 0)
break;
ret = iscsit_tmr_post_handler(cmd, conn);
if (ret != 0)
iscsit_fall_back_to_erl0(conn->sess);
break;
case ISTATE_SEND_TEXTRSP:
ret = iscsit_send_text_rsp(cmd, conn);
break;
default:
pr_err("Unknown Opcode: 0x%02x ITT:"
" 0x%08x, i_state: %d on CID: %hu\n",
cmd->iscsi_opcode, cmd->init_task_tag,
state, conn->cid);
goto err;
}
if (ret < 0)
goto err;
switch (state) {
case ISTATE_SEND_LOGOUTRSP:
if (!iscsit_logout_post_handler(cmd, conn))
return -ECONNRESET;
fallthrough;
case ISTATE_SEND_STATUS:
case ISTATE_SEND_ASYNCMSG:
case ISTATE_SEND_NOPIN:
case ISTATE_SEND_STATUS_RECOVERY:
case ISTATE_SEND_TEXTRSP:
case ISTATE_SEND_TASKMGTRSP:
case ISTATE_SEND_REJECT:
spin_lock_bh(&cmd->istate_lock);
cmd->i_state = ISTATE_SENT_STATUS;
spin_unlock_bh(&cmd->istate_lock);
break;
default:
pr_err("Unknown Opcode: 0x%02x ITT:"
" 0x%08x, i_state: %d on CID: %hu\n",
cmd->iscsi_opcode, cmd->init_task_tag,
cmd->i_state, conn->cid);
goto err;
}
if (atomic_read(&conn->check_immediate_queue))
return 1;
return 0;
err:
return -1;
}
EXPORT_SYMBOL(iscsit_response_queue);
static int iscsit_handle_response_queue(struct iscsi_conn *conn)
{
struct iscsit_transport *t = conn->conn_transport;
struct iscsi_queue_req *qr;
struct iscsi_cmd *cmd;
u8 state;
int ret;
while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
cmd = qr->cmd;
state = qr->state;
kmem_cache_free(lio_qr_cache, qr);
ret = t->iscsit_response_queue(conn, cmd, state);
if (ret == 1 || ret < 0)
return ret;
}
return 0;
}
int iscsi_target_tx_thread(void *arg)
{
int ret = 0;
struct iscsi_conn *conn = arg;
bool conn_freed = false;
/*
* Allow ourselves to be interrupted by SIGINT so that a
* connection recovery / failure event can be triggered externally.
*/
allow_signal(SIGINT);
while (!kthread_should_stop()) {
/*
* Ensure that both TX and RX per connection kthreads
* are scheduled to run on the same CPU.
*/
iscsit_thread_check_cpumask(conn, current, 1);
wait_event_interruptible(conn->queues_wq,
!iscsit_conn_all_queues_empty(conn));
if (signal_pending(current))
goto transport_err;
get_immediate:
ret = iscsit_handle_immediate_queue(conn);
if (ret < 0)
goto transport_err;
ret = iscsit_handle_response_queue(conn);
if (ret == 1) {
goto get_immediate;
} else if (ret == -ECONNRESET) {
conn_freed = true;
goto out;
} else if (ret < 0) {
goto transport_err;
}
}
transport_err:
/*
* Avoid the normal connection failure code-path if this connection
* is still within LOGIN mode, and iscsi_np process context is
* responsible for cleaning up the early connection failure.
*/
if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
iscsit_take_action_for_connection_exit(conn, &conn_freed);
out:
if (!conn_freed) {
while (!kthread_should_stop()) {
msleep(100);
}
}
return 0;
}
static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
{
struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
struct iscsi_cmd *cmd;
int ret = 0;
switch (hdr->opcode & ISCSI_OPCODE_MASK) {
case ISCSI_OP_SCSI_CMD:
cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
if (!cmd)
goto reject;
ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
break;
case ISCSI_OP_SCSI_DATA_OUT:
ret = iscsit_handle_data_out(conn, buf);
break;
case ISCSI_OP_NOOP_OUT:
cmd = NULL;
if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
if (!cmd)
goto reject;
}
ret = iscsit_handle_nop_out(conn, cmd, buf);
break;
case ISCSI_OP_SCSI_TMFUNC:
cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
if (!cmd)
goto reject;
ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
break;
case ISCSI_OP_TEXT:
if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
if (!cmd)
goto reject;
} else {
cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
if (!cmd)
goto reject;
}
ret = iscsit_handle_text_cmd(conn, cmd, buf);
break;
case ISCSI_OP_LOGOUT:
cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
if (!cmd)
goto reject;
ret = iscsit_handle_logout_cmd(conn, cmd, buf);
if (ret > 0)
wait_for_completion_timeout(&conn->conn_logout_comp,
SECONDS_FOR_LOGOUT_COMP * HZ);
break;
case ISCSI_OP_SNACK:
ret = iscsit_handle_snack(conn, buf);
break;
default:
pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
pr_err("Cannot recover from unknown"
" opcode while ERL=0, closing iSCSI connection.\n");
return -1;
}
pr_err("Unable to recover from unknown opcode while OFMarker=No,"
" closing iSCSI connection.\n");
ret = -1;
break;
}
return ret;
reject:
return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
}
static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
{
bool ret;
spin_lock_bh(&conn->state_lock);
ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
spin_unlock_bh(&conn->state_lock);
return ret;
}
static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
{
int ret;
u8 *buffer, opcode;
u32 checksum = 0, digest = 0;
struct kvec iov;
buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
if (!buffer)
return;
while (!kthread_should_stop()) {
/*
* Ensure that both TX and RX per connection kthreads
* are scheduled to run on the same CPU.
*/
iscsit_thread_check_cpumask(conn, current, 0);
memset(&iov, 0, sizeof(struct kvec));
iov.iov_base = buffer;
iov.iov_len = ISCSI_HDR_LEN;
ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
if (ret != ISCSI_HDR_LEN) {
iscsit_rx_thread_wait_for_tcp(conn);
break;
}
if (conn->conn_ops->HeaderDigest) {
iov.iov_base = &digest;
iov.iov_len = ISCSI_CRC_LEN;
ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
if (ret != ISCSI_CRC_LEN) {
iscsit_rx_thread_wait_for_tcp(conn);
break;
}
iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
ISCSI_HDR_LEN, 0, NULL,
&checksum);
if (digest != checksum) {
pr_err("HeaderDigest CRC32C failed,"
" received 0x%08x, computed 0x%08x\n",
digest, checksum);
/*
* Set the PDU to 0xff so it will intentionally
* hit default in the switch below.
*/
memset(buffer, 0xff, ISCSI_HDR_LEN);
atomic_long_inc(&conn->sess->conn_digest_errors);
} else {
pr_debug("Got HeaderDigest CRC32C"
" 0x%08x\n", checksum);
}
}
if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
break;
opcode = buffer[0] & ISCSI_OPCODE_MASK;
if (conn->sess->sess_ops->SessionType &&
((!(opcode & ISCSI_OP_TEXT)) ||
(!(opcode & ISCSI_OP_LOGOUT)))) {
pr_err("Received illegal iSCSI Opcode: 0x%02x"
" while in Discovery Session, rejecting.\n", opcode);
iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
buffer);
break;
}
ret = iscsi_target_rx_opcode(conn, buffer);
if (ret < 0)
break;
}
kfree(buffer);
}
int iscsi_target_rx_thread(void *arg)
{
int rc;
struct iscsi_conn *conn = arg;
bool conn_freed = false;
/*
* Allow ourselves to be interrupted by SIGINT so that a
* connection recovery / failure event can be triggered externally.
*/
allow_signal(SIGINT);
/*
* Wait for iscsi_post_login_handler() to complete before allowing
* incoming iscsi/tcp socket I/O, and/or failing the connection.
*/
rc = wait_for_completion_interruptible(&conn->rx_login_comp);
if (rc < 0 || iscsi_target_check_conn_state(conn))
goto out;
if (!conn->conn_transport->iscsit_get_rx_pdu)
return 0;
conn->conn_transport->iscsit_get_rx_pdu(conn);
if (!signal_pending(current))
atomic_set(&conn->transport_failed, 1);
iscsit_take_action_for_connection_exit(conn, &conn_freed);
out:
if (!conn_freed) {
while (!kthread_should_stop()) {
msleep(100);
}
}
return 0;
}
static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
{
LIST_HEAD(tmp_list);
struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
struct iscsi_session *sess = conn->sess;
/*
* We expect this function to only ever be called from either RX or TX
* thread context via iscsit_close_connection() once the other context
* has been reset -> returned sleeping pre-handler state.
*/
spin_lock_bh(&conn->cmd_lock);
list_splice_init(&conn->conn_cmd_list, &tmp_list);
list_for_each_entry(cmd, &tmp_list, i_conn_node) {
struct se_cmd *se_cmd = &cmd->se_cmd;
if (se_cmd->se_tfo != NULL) {
spin_lock_irq(&se_cmd->t_state_lock);
se_cmd->transport_state |= CMD_T_FABRIC_STOP;
spin_unlock_irq(&se_cmd->t_state_lock);
}
}
spin_unlock_bh(&conn->cmd_lock);
list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
list_del_init(&cmd->i_conn_node);
iscsit_increment_maxcmdsn(cmd, sess);
iscsit_free_cmd(cmd, true);
}
}
static void iscsit_stop_timers_for_cmds(
struct iscsi_conn *conn)
{
struct iscsi_cmd *cmd;
spin_lock_bh(&conn->cmd_lock);
list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
if (cmd->data_direction == DMA_TO_DEVICE)
iscsit_stop_dataout_timer(cmd);
}
spin_unlock_bh(&conn->cmd_lock);
}
int iscsit_close_connection(
struct iscsi_conn *conn)
{
int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
struct iscsi_session *sess = conn->sess;
pr_debug("Closing iSCSI connection CID %hu on SID:"
" %u\n", conn->cid, sess->sid);
/*
* Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
* case just in case the RX Thread in iscsi_target_rx_opcode() is
* sleeping and the logout response never got sent because the
* connection failed.
*
* However for iser-target, isert_wait4logout() is using conn_logout_comp
* to signal logout response TX interrupt completion. Go ahead and skip
* this for iser since isert_rx_opcode() does not wait on logout failure,
* and to avoid iscsi_conn pointer dereference in iser-target code.
*/
if (!conn->conn_transport->rdma_shutdown)
complete(&conn->conn_logout_comp);
if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
if (conn->tx_thread &&
cmpxchg(&conn->tx_thread_active, true, false)) {
send_sig(SIGINT, conn->tx_thread, 1);
kthread_stop(conn->tx_thread);
}
} else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
if (conn->rx_thread &&
cmpxchg(&conn->rx_thread_active, true, false)) {
send_sig(SIGINT, conn->rx_thread, 1);
kthread_stop(conn->rx_thread);
}
}
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);
iscsit_stop_timers_for_cmds(conn);
iscsit_stop_nopin_response_timer(conn);
iscsit_stop_nopin_timer(conn);
if (conn->conn_transport->iscsit_wait_conn)
conn->conn_transport->iscsit_wait_conn(conn);
/*
* During Connection recovery drop unacknowledged out of order
* commands for this connection, and prepare the other commands
* for reallegiance.
*
* During normal operation clear the out of order commands (but
* do not free the struct iscsi_ooo_cmdsn's) and release all
* struct iscsi_cmds.
*/
if (atomic_read(&conn->connection_recovery)) {
iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
iscsit_prepare_cmds_for_reallegiance(conn);
} else {
iscsit_clear_ooo_cmdsns_for_conn(conn);
iscsit_release_commands_from_conn(conn);
}
iscsit_free_queue_reqs_for_conn(conn);
/*
* Handle decrementing session or connection usage count if
* a logout response was not able to be sent because the
* connection failed. Fall back to Session Recovery here.
*/
if (atomic_read(&conn->conn_logout_remove)) {
if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
iscsit_dec_conn_usage_count(conn);
iscsit_dec_session_usage_count(sess);
}
if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
iscsit_dec_conn_usage_count(conn);
atomic_set(&conn->conn_logout_remove, 0);
atomic_set(&sess->session_reinstatement, 0);
atomic_set(&sess->session_fall_back_to_erl0, 1);
}
spin_lock_bh(&sess->conn_lock);
list_del(&conn->conn_list);
/*
* Attempt to let the Initiator know this connection failed by
* sending an Connection Dropped Async Message on another
* active connection.
*/
if (atomic_read(&conn->connection_recovery))
iscsit_build_conn_drop_async_message(conn);
spin_unlock_bh(&sess->conn_lock);
/*
* If connection reinstatement is being performed on this connection,
* up the connection reinstatement semaphore that is being blocked on
* in iscsit_cause_connection_reinstatement().
*/
spin_lock_bh(&conn->state_lock);
if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
spin_unlock_bh(&conn->state_lock);
complete(&conn->conn_wait_comp);
wait_for_completion(&conn->conn_post_wait_comp);
spin_lock_bh(&conn->state_lock);
}
/*
* If connection reinstatement is being performed on this connection
* by receiving a REMOVECONNFORRECOVERY logout request, up the
* connection wait rcfr semaphore that is being blocked on
* an iscsit_connection_reinstatement_rcfr().
*/
if (atomic_read(&conn->connection_wait_rcfr)) {
spin_unlock_bh(&conn->state_lock);
complete(&conn->conn_wait_rcfr_comp);
wait_for_completion(&conn->conn_post_wait_comp);
spin_lock_bh(&conn->state_lock);
}
atomic_set(&conn->connection_reinstatement, 1);
spin_unlock_bh(&conn->state_lock);
/*
* If any other processes are accessing this connection pointer we
* must wait until they have completed.
*/
iscsit_check_conn_usage_count(conn);
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->sock)
sock_release(conn->sock);
if (conn->conn_transport->iscsit_free_conn)
conn->conn_transport->iscsit_free_conn(conn);
pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
conn->conn_state = TARG_CONN_STATE_FREE;
iscsit_free_conn(conn);
spin_lock_bh(&sess->conn_lock);
atomic_dec(&sess->nconn);
pr_debug("Decremented iSCSI connection count to %hu from node:"
" %s\n", atomic_read(&sess->nconn),
sess->sess_ops->InitiatorName);
/*
* Make sure that if one connection fails in an non ERL=2 iSCSI
* Session that they all fail.
*/
if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
!atomic_read(&sess->session_logout))
atomic_set(&sess->session_fall_back_to_erl0, 1);
/*
* If this was not the last connection in the session, and we are
* performing session reinstatement or falling back to ERL=0, call
* iscsit_stop_session() without sleeping to shutdown the other
* active connections.
*/
if (atomic_read(&sess->nconn)) {
if (!atomic_read(&sess->session_reinstatement) &&
!atomic_read(&sess->session_fall_back_to_erl0)) {
spin_unlock_bh(&sess->conn_lock);
return 0;
}
if (!atomic_read(&sess->session_stop_active)) {
atomic_set(&sess->session_stop_active, 1);
spin_unlock_bh(&sess->conn_lock);
iscsit_stop_session(sess, 0, 0);
return 0;
}
spin_unlock_bh(&sess->conn_lock);
return 0;
}
/*
* If this was the last connection in the session and one of the
* following is occurring:
*
* Session Reinstatement is not being performed, and are falling back
* to ERL=0 call iscsit_close_session().
*
* Session Logout was requested. iscsit_close_session() will be called
* elsewhere.
*
* Session Continuation is not being performed, start the Time2Retain
* handler and check if sleep_on_sess_wait_sem is active.
*/
if (!atomic_read(&sess->session_reinstatement) &&
atomic_read(&sess->session_fall_back_to_erl0)) {
spin_unlock_bh(&sess->conn_lock);
complete_all(&sess->session_wait_comp);
iscsit_close_session(sess);
return 0;
} else if (atomic_read(&sess->session_logout)) {
pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
sess->session_state = TARG_SESS_STATE_FREE;
if (atomic_read(&sess->session_close)) {
spin_unlock_bh(&sess->conn_lock);
complete_all(&sess->session_wait_comp);
iscsit_close_session(sess);
} else {
spin_unlock_bh(&sess->conn_lock);
}
return 0;
} else {
pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
sess->session_state = TARG_SESS_STATE_FAILED;
if (!atomic_read(&sess->session_continuation))
iscsit_start_time2retain_handler(sess);
if (atomic_read(&sess->session_close)) {
spin_unlock_bh(&sess->conn_lock);
complete_all(&sess->session_wait_comp);
iscsit_close_session(sess);
} else {
spin_unlock_bh(&sess->conn_lock);
}
return 0;
}
}
/*
* If the iSCSI Session for the iSCSI Initiator Node exists,
* forcefully shutdown the iSCSI NEXUS.
*/
int iscsit_close_session(struct iscsi_session *sess)
{
struct iscsi_portal_group *tpg = sess->tpg;
struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
if (atomic_read(&sess->nconn)) {
pr_err("%d connection(s) still exist for iSCSI session"
" to %s\n", atomic_read(&sess->nconn),
sess->sess_ops->InitiatorName);
BUG();
}
spin_lock_bh(&se_tpg->session_lock);
atomic_set(&sess->session_logout, 1);
atomic_set(&sess->session_reinstatement, 1);
iscsit_stop_time2retain_timer(sess);
spin_unlock_bh(&se_tpg->session_lock);
/*
* transport_deregister_session_configfs() will clear the
* struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
* can be setting it again with __transport_register_session() in
* iscsi_post_login_handler() again after the iscsit_stop_session()
* completes in iscsi_np context.
*/
transport_deregister_session_configfs(sess->se_sess);
/*
* If any other processes are accessing this session pointer we must
* wait until they have completed. If we are in an interrupt (the
* time2retain handler) and contain and active session usage count we
* restart the timer and exit.
*/
if (!in_interrupt()) {
iscsit_check_session_usage_count(sess);
} else {
if (iscsit_check_session_usage_count(sess) == 2) {
atomic_set(&sess->session_logout, 0);
iscsit_start_time2retain_handler(sess);
return 0;
}
}
transport_deregister_session(sess->se_sess);
if (sess->sess_ops->ErrorRecoveryLevel == 2)
iscsit_free_connection_recovery_entries(sess);
iscsit_free_all_ooo_cmdsns(sess);
spin_lock_bh(&se_tpg->session_lock);
pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
sess->session_state = TARG_SESS_STATE_FREE;
pr_debug("Released iSCSI session from node: %s\n",
sess->sess_ops->InitiatorName);
tpg->nsessions--;
if (tpg->tpg_tiqn)
tpg->tpg_tiqn->tiqn_nsessions--;
pr_debug("Decremented number of active iSCSI Sessions on"
" iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
ida_free(&sess_ida, sess->session_index);
kfree(sess->sess_ops);
sess->sess_ops = NULL;
spin_unlock_bh(&se_tpg->session_lock);
kfree(sess);
return 0;
}
static void iscsit_logout_post_handler_closesession(
struct iscsi_conn *conn)
{
struct iscsi_session *sess = conn->sess;
int sleep = 1;
/*
* Traditional iscsi/tcp will invoke this logic from TX thread
* context during session logout, so clear tx_thread_active and
* sleep if iscsit_close_connection() has not already occured.
*
* Since iser-target invokes this logic from it's own workqueue,
* always sleep waiting for RX/TX thread shutdown to complete
* within iscsit_close_connection().
*/
if (!conn->conn_transport->rdma_shutdown) {
sleep = cmpxchg(&conn->tx_thread_active, true, false);
if (!sleep)
return;
}
atomic_set(&conn->conn_logout_remove, 0);
complete(&conn->conn_logout_comp);
iscsit_dec_conn_usage_count(conn);
atomic_set(&sess->session_close, 1);
iscsit_stop_session(sess, sleep, sleep);
iscsit_dec_session_usage_count(sess);
}
static void iscsit_logout_post_handler_samecid(
struct iscsi_conn *conn)
{
int sleep = 1;
if (!conn->conn_transport->rdma_shutdown) {
sleep = cmpxchg(&conn->tx_thread_active, true, false);
if (!sleep)
return;
}
atomic_set(&conn->conn_logout_remove, 0);
complete(&conn->conn_logout_comp);
iscsit_cause_connection_reinstatement(conn, sleep);
iscsit_dec_conn_usage_count(conn);
}
static void iscsit_logout_post_handler_diffcid(
struct iscsi_conn *conn,
u16 cid)
{
struct iscsi_conn *l_conn;
struct iscsi_session *sess = conn->sess;
bool conn_found = false;
if (!sess)
return;
spin_lock_bh(&sess->conn_lock);
list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
if (l_conn->cid == cid) {
iscsit_inc_conn_usage_count(l_conn);
conn_found = true;
break;
}
}
spin_unlock_bh(&sess->conn_lock);
if (!conn_found)
return;
if (l_conn->sock)
l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
spin_lock_bh(&l_conn->state_lock);
pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
spin_unlock_bh(&l_conn->state_lock);
iscsit_cause_connection_reinstatement(l_conn, 1);
iscsit_dec_conn_usage_count(l_conn);
}
/*
* Return of 0 causes the TX thread to restart.
*/
int iscsit_logout_post_handler(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn)
{
int ret = 0;
switch (cmd->logout_reason) {
case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
switch (cmd->logout_response) {
case ISCSI_LOGOUT_SUCCESS:
case ISCSI_LOGOUT_CLEANUP_FAILED:
default:
iscsit_logout_post_handler_closesession(conn);
break;
}
ret = 0;
break;
case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
if (conn->cid == cmd->logout_cid) {
switch (cmd->logout_response) {
case ISCSI_LOGOUT_SUCCESS:
case ISCSI_LOGOUT_CLEANUP_FAILED:
default:
iscsit_logout_post_handler_samecid(conn);
break;
}
ret = 0;
} else {
switch (cmd->logout_response) {
case ISCSI_LOGOUT_SUCCESS:
iscsit_logout_post_handler_diffcid(conn,
cmd->logout_cid);
break;
case ISCSI_LOGOUT_CID_NOT_FOUND:
case ISCSI_LOGOUT_CLEANUP_FAILED:
default:
break;
}
ret = 1;
}
break;
case ISCSI_LOGOUT_REASON_RECOVERY:
switch (cmd->logout_response) {
case ISCSI_LOGOUT_SUCCESS:
case ISCSI_LOGOUT_CID_NOT_FOUND:
case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
case ISCSI_LOGOUT_CLEANUP_FAILED:
default:
break;
}
ret = 1;
break;
default:
break;
}
return ret;
}
EXPORT_SYMBOL(iscsit_logout_post_handler);
void iscsit_fail_session(struct iscsi_session *sess)
{
struct iscsi_conn *conn;
spin_lock_bh(&sess->conn_lock);
list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
}
spin_unlock_bh(&sess->conn_lock);
pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
sess->session_state = TARG_SESS_STATE_FAILED;
}
void iscsit_stop_session(
struct iscsi_session *sess,
int session_sleep,
int connection_sleep)
{
u16 conn_count = atomic_read(&sess->nconn);
struct iscsi_conn *conn, *conn_tmp = NULL;
int is_last;
spin_lock_bh(&sess->conn_lock);
if (connection_sleep) {
list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
conn_list) {
if (conn_count == 0)
break;
if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
is_last = 1;
} else {
iscsit_inc_conn_usage_count(conn_tmp);
is_last = 0;
}
iscsit_inc_conn_usage_count(conn);
spin_unlock_bh(&sess->conn_lock);
iscsit_cause_connection_reinstatement(conn, 1);
spin_lock_bh(&sess->conn_lock);
iscsit_dec_conn_usage_count(conn);
if (is_last == 0)
iscsit_dec_conn_usage_count(conn_tmp);
conn_count--;
}
} else {
list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
iscsit_cause_connection_reinstatement(conn, 0);
}
if (session_sleep && atomic_read(&sess->nconn)) {
spin_unlock_bh(&sess->conn_lock);
wait_for_completion(&sess->session_wait_comp);
} else
spin_unlock_bh(&sess->conn_lock);
}
int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
{
struct iscsi_session *sess;
struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
struct se_session *se_sess, *se_sess_tmp;
LIST_HEAD(free_list);
int session_count = 0;
spin_lock_bh(&se_tpg->session_lock);
if (tpg->nsessions && !force) {
spin_unlock_bh(&se_tpg->session_lock);
return -1;
}
list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
sess_list) {
sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
spin_lock(&sess->conn_lock);
if (atomic_read(&sess->session_fall_back_to_erl0) ||
atomic_read(&sess->session_logout) ||
atomic_read(&sess->session_close) ||
(sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
spin_unlock(&sess->conn_lock);
continue;
}
iscsit_inc_session_usage_count(sess);
atomic_set(&sess->session_reinstatement, 1);
atomic_set(&sess->session_fall_back_to_erl0, 1);
atomic_set(&sess->session_close, 1);
spin_unlock(&sess->conn_lock);
list_move_tail(&se_sess->sess_list, &free_list);
}
spin_unlock_bh(&se_tpg->session_lock);
list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
list_del_init(&se_sess->sess_list);
iscsit_stop_session(sess, 1, 1);
iscsit_dec_session_usage_count(sess);
session_count++;
}
pr_debug("Released %d iSCSI Session(s) from Target Portal"
" Group: %hu\n", session_count, tpg->tpgt);
return 0;
}
MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
MODULE_VERSION("4.1.x");
MODULE_AUTHOR("nab@Linux-iSCSI.org");
MODULE_LICENSE("GPL");
module_init(iscsi_target_init_module);
module_exit(iscsi_target_cleanup_module);
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