| /******************************************************************************* |
| * 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> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| ******************************************************************************/ |
| |
| #include <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 <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; |
| struct idr sess_idr; |
| struct mutex auth_id_lock; |
| spinlock_t sess_idr_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; |
| } |
| |
| /* |
| * Called with mutex np_lock held |
| */ |
| static struct iscsi_np *iscsit_get_np( |
| struct sockaddr_storage *sockaddr, |
| int network_transport) |
| { |
| struct iscsi_np *np; |
| bool match; |
| |
| 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); |
| |
| 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, u8 *, u8 *); |
| 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, |
| (u8 *)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, |
| (u8 *)&cmd->pad_bytes, |
| (u8 *)&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 *, struct kvec *, u32, u32); |
| 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, |
| (u8 *)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[1], |
| 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); |
| spin_lock_init(&sess_idr_lock); |
| idr_init(&tiqn_idr); |
| idr_init(&sess_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("nable 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; |
| |
| 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 (cmd->se_cmd.se_tfo != NULL) { |
| 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, |
| u32 data_offset, |
| u32 data_length) |
| { |
| u32 i = 0; |
| 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 (ent >= cmd->se_cmd.t_data_nents) { |
| pr_err("Initial page entry out-of-bounds\n"); |
| return -1; |
| } |
| |
| 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 = 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; |
| } |
| |
| 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); |
| |
| 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 = transport_lookup_cmd_lun(&cmd->se_cmd, |
| scsilun_to_int(&hdr->lun)); |
| 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_setup_cmd_from_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; |
| } |
| |
| 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_unsoliticed_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_unsoliticed_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_unsoliticed_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; |
| /* |
| * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. |
| */ |
| if (dump_payload) |
| goto after_immediate_data; |
| /* |
| * Check for underflow case where both EDTL and immediate data payload |
| * exceeds what is presented by CDB's TRANSFER LENGTH, and what has |
| * already been set in target_cmd_size_check() as se_cmd->data_length. |
| * |
| * For this special case, fail the command and dump the immediate data |
| * payload. |
| */ |
| if (cmd->first_burst_len > cmd->se_cmd.data_length) { |
| cmd->sense_reason = TCM_INVALID_CDB_FIELD; |
| goto after_immediate_data; |
| } |
| |
| immed_ret = iscsit_handle_immediate_data(cmd, hdr, |
| cmd->first_burst_len); |
| after_immediate_data: |
| 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) { |
| int rc; |
| |
| rc = iscsit_dump_data_payload(cmd->conn, |
| cmd->first_burst_len, 1); |
| target_put_sess_cmd(&cmd->se_cmd); |
| return rc; |
| } else if (cmd->unsolicited_data) |
| iscsit_set_unsoliticed_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, |
| u8 *pad_bytes, |
| u8 *data_crc) |
| { |
| struct scatterlist sg[2]; |
| |
| sg_init_table(sg, ARRAY_SIZE(sg)); |
| sg_set_buf(sg, buf, payload_length); |
| 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", |
| 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); |
| |
| transport_check_aborted_status(se_cmd, |
| (hdr->flags & ISCSI_FLAG_CMD_FINAL)); |
| 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) |
| if (--cmd->outstanding_r2ts < 1) { |
| iscsit_stop_dataout_timer(cmd); |
| transport_check_aborted_status( |
| se_cmd, 1); |
| } |
| |
| 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 = ntoh24(hdr->dlength); |
| int iov_ret, data_crc_failed = 0; |
| |
| rx_size += payload_length; |
| iov = &cmd->iov_data[0]; |
| |
| iov_ret = iscsit_map_iovec(cmd, iov, 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; |
| } |
| |
| 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; |
| } |
| |
| 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, |
| (u8 *)&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; |
| bool sess_ref = false; |
| 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); |
| |
| /* |
| * TASK_REASSIGN for ERL=2 / connection stays inside of |
| * LIO-Target $FABRIC_MOD |
| */ |
| if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { |
| transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, |
| conn->sess->se_sess, 0, DMA_NONE, |
| TCM_SIMPLE_TAG, cmd->sense_buffer + 2); |
| |
| target_get_sess_cmd(&cmd->se_cmd, true); |
| sess_ref = true; |
| 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, |
| scsilun_to_int(&hdr->lun)); |
| 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) |
| 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. |
| */ |
| if (sess_ref) { |
| pr_debug("Handle TMR, using sess_ref=true check\n"); |
| target_put_sess_cmd(&cmd->se_cmd); |
| } |
| |
| iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); |
| 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, 11) != 0) { |
| pr_err("Received Text Data that is not" |
| " SendTargets, cannot continue.\n"); |
| goto reject; |
| } |
| text_ptr = strchr(text_in, '='); |
| if (!text_ptr) { |
| pr_err("No \"=\" separator found in Text Data," |
| " cannot continue.\n"); |
| goto reject; |
| } |
| if (!strncmp("=All", text_ptr, 4)) { |
| 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, pad_bytes = 0; |
| int niov = 0, rx_got; |
| struct kvec iov[3]; |
| |
| text_in = kzalloc(payload_length, GFP_KERNEL); |
| if (!text_in) |
| goto reject; |
| |
| cmd->text_in_ptr = text_in; |
| |
| memset(iov, 0, 3 * sizeof(struct kvec)); |
| iov[niov].iov_base = text_in; |
| iov[niov++].iov_len = payload_length; |
| |
| padding = ((-payload_length) & 3); |
| if (padding != 0) { |
| iov[niov].iov_base = &pad_bytes; |
| iov[niov++].iov_len = padding; |
| rx_size += 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; |
| } |
| |
| 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, payload_length, |
| padding, (u8 *)&pad_bytes, |
| (u8 *)&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; |
| |
| iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length); |
| if (iov_ret < 0) |
| return IMMEDIATE_DATA_CANNOT_RECOVER; |
| |
| rx_size = length; |
| iov_count = iov_ret; |
| iov = &cmd->iov_data[0]; |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| /* |
| * Called with sess->conn_lock held. |
| */ |
| /* #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; |
| |
| /* |
| * 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
|