diff options
Diffstat (limited to 'drivers/target/iscsi/iscsi_target.c')
| -rw-r--r-- | drivers/target/iscsi/iscsi_target.c | 4563 |
1 files changed, 4563 insertions, 0 deletions
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c new file mode 100644 index 000000000000..6a4ea29c2f36 --- /dev/null +++ b/drivers/target/iscsi/iscsi_target.c @@ -0,0 +1,4563 @@ +/******************************************************************************* + * This file contains main functions related to the iSCSI Target Core Driver. + * + * \u00a9 Copyright 2007-2011 RisingTide Systems LLC. + * + * Licensed to the Linux Foundation under the General Public License (GPL) version 2. + * + * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + ******************************************************************************/ + +#include <linux/string.h> +#include <linux/kthread.h> +#include <linux/crypto.h> +#include <linux/completion.h> +#include <asm/unaligned.h> +#include <scsi/scsi_device.h> +#include <scsi/iscsi_proto.h> +#include <target/target_core_base.h> +#include <target/target_core_tmr.h> +#include <target/target_core_transport.h> + +#include "iscsi_target_core.h" +#include "iscsi_target_parameters.h" +#include "iscsi_target_seq_pdu_list.h" +#include "iscsi_target_tq.h" +#include "iscsi_target_configfs.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 "iscsi_target_stat.h" + +static LIST_HEAD(g_tiqn_list); +static LIST_HEAD(g_np_list); +static DEFINE_SPINLOCK(tiqn_lock); +static DEFINE_SPINLOCK(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_cmd_cache; +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 *, + unsigned char *buf, u32); +static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *); + +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(struct iscsi_tiqn), GFP_KERNEL); + if (!tiqn) { + pr_err("Unable to allocate struct iscsi_tiqn\n"); + 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); + + if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) { + pr_err("idr_pre_get() for tiqn_idr failed\n"); + kfree(tiqn); + return ERR_PTR(-ENOMEM); + } + tiqn->tiqn_state = TIQN_STATE_ACTIVE; + + spin_lock(&tiqn_lock); + ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index); + if (ret < 0) { + pr_err("idr_get_new() failed for tiqn->tiqn_index\n"); + spin_unlock(&tiqn_lock); + kfree(tiqn); + return ERR_PTR(ret); + } + list_add_tail(&tiqn->tiqn_list, &g_tiqn_list); + spin_unlock(&tiqn_lock); + + 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; + } + if (np->np_login_tpg) { + pr_err("np->np_login_tpg() is not NULL!\n"); + 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 = mutex_lock_interruptible(&tpg->np_login_lock); + if ((ret != 0) || signal_pending(current)) + return -1; + + spin_lock_bh(&np->np_thread_lock); + np->np_login_tpg = tpg; + spin_unlock_bh(&np->np_thread_lock); + + return 0; +} + +int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) +{ + struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; + + spin_lock_bh(&np->np_thread_lock); + np->np_login_tpg = NULL; + spin_unlock_bh(&np->np_thread_lock); + + mutex_unlock(&tpg->np_login_lock); + + if (tiqn) + iscsit_put_tiqn_for_login(tiqn); + + return 0; +} + +static struct iscsi_np *iscsit_get_np( + struct __kernel_sockaddr_storage *sockaddr, + int network_transport) +{ + struct sockaddr_in *sock_in, *sock_in_e; + struct sockaddr_in6 *sock_in6, *sock_in6_e; + struct iscsi_np *np; + int ip_match = 0; + u16 port; + + spin_lock_bh(&np_lock); + list_for_each_entry(np, &g_np_list, np_list) { + spin_lock(&np->np_thread_lock); + if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { + spin_unlock(&np->np_thread_lock); + continue; + } + + if (sockaddr->ss_family == AF_INET6) { + sock_in6 = (struct sockaddr_in6 *)sockaddr; + sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr; + + if (!memcmp((void *)&sock_in6->sin6_addr.in6_u, + (void *)&sock_in6_e->sin6_addr.in6_u, + sizeof(struct in6_addr))) + ip_match = 1; + + port = ntohs(sock_in6->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 = 1; + + port = ntohs(sock_in->sin_port); + } + + if ((ip_match == 1) && (np->np_port == port) && + (np->np_network_transport == network_transport)) { + /* + * 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(&np->np_thread_lock); + spin_unlock_bh(&np_lock); + return np; + } + spin_unlock(&np->np_thread_lock); + } + spin_unlock_bh(&np_lock); + + return NULL; +} + +struct iscsi_np *iscsit_add_np( + struct __kernel_sockaddr_storage *sockaddr, + char *ip_str, + int network_transport) +{ + struct sockaddr_in *sock_in; + struct sockaddr_in6 *sock_in6; + struct iscsi_np *np; + int ret; + /* + * Locate the existing struct iscsi_np if already active.. + */ + np = iscsit_get_np(sockaddr, network_transport); + if (np) + return np; + + np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL); + if (!np) { + pr_err("Unable to allocate memory for struct iscsi_np\n"); + return ERR_PTR(-ENOMEM); + } + + np->np_flags |= NPF_IP_NETWORK; + if (sockaddr->ss_family == AF_INET6) { + sock_in6 = (struct sockaddr_in6 *)sockaddr; + snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str); + np->np_port = ntohs(sock_in6->sin6_port); + } else { + sock_in = (struct sockaddr_in *)sockaddr; + sprintf(np->np_ip, "%s", ip_str); + np->np_port = ntohs(sock_in->sin_port); + } + + 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); + 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); + 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; + + spin_lock_bh(&np_lock); + list_add_tail(&np->np_list, &g_np_list); + spin_unlock_bh(&np_lock); + + pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n", + np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ? + "TCP" : "SCTP"); + + return np; +} + +int iscsit_reset_np_thread( + struct iscsi_np *np, + struct iscsi_tpg_np *tpg_np, + struct iscsi_portal_group *tpg) +{ + spin_lock_bh(&np->np_thread_lock); + if (tpg && tpg_np) { + /* + * The reset operation need only be performed when the + * passed struct iscsi_portal_group has a login in progress + * to one of the network portals. + */ + if (tpg_np->tpg_np->np_login_tpg != tpg) { + spin_unlock_bh(&np->np_thread_lock); + return 0; + } + } + 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; + + 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); + + return 0; +} + +int iscsit_del_np_comm(struct iscsi_np *np) +{ + if (!np->np_socket) + return 0; + + /* + * Some network transports allocate their own struct sock->file, + * see if we need to free any additional allocated resources. + */ + if (np->np_flags & NPF_SCTP_STRUCT_FILE) { + kfree(np->np_socket->file); + np->np_socket->file = NULL; + } + + sock_release(np->np_socket); + return 0; +} + +int iscsit_del_np(struct iscsi_np *np) +{ + spin_lock_bh(&np->np_thread_lock); + np->np_exports--; + if (np->np_exports) { + 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); + } + iscsit_del_np_comm(np); + + spin_lock_bh(&np_lock); + list_del(&np->np_list); + spin_unlock_bh(&np_lock); + + pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n", + np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ? + "TCP" : "SCTP"); + + kfree(np); + return 0; +} + +static int __init iscsi_target_init_module(void) +{ + int ret = 0; + + pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); + + iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL); + if (!iscsit_global) { + pr_err("Unable to allocate memory for iscsit_global\n"); + return -1; + } + mutex_init(&auth_id_lock); + spin_lock_init(&sess_idr_lock); + idr_init(&tiqn_idr); + idr_init(&sess_idr); + + ret = iscsi_target_register_configfs(); + if (ret < 0) + goto out; + + ret = iscsi_thread_set_init(); + if (ret < 0) + goto configfs_out; + + if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) != + TARGET_THREAD_SET_COUNT) { + pr_err("iscsi_allocate_thread_sets() returned" + " unexpected value!\n"); + goto ts_out1; + } + + lio_cmd_cache = kmem_cache_create("lio_cmd_cache", + sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd), + 0, NULL); + if (!lio_cmd_cache) { + pr_err("Unable to kmem_cache_create() for" + " lio_cmd_cache\n"); + goto ts_out2; + } + + 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 cmd_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; + } + + if (iscsit_load_discovery_tpg() < 0) + goto r2t_out; + + return ret; +r2t_out: + 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); +cmd_out: + kmem_cache_destroy(lio_cmd_cache); +ts_out2: + iscsi_deallocate_thread_sets(); +ts_out1: + iscsi_thread_set_free(); +configfs_out: + iscsi_target_deregister_configfs(); +out: + kfree(iscsit_global); + return -ENOMEM; +} + +static void __exit iscsi_target_cleanup_module(void) +{ + iscsi_deallocate_thread_sets(); + iscsi_thread_set_free(); + iscsit_release_discovery_tpg(); + kmem_cache_destroy(lio_cmd_cache); + kmem_cache_destroy(lio_qr_cache); + kmem_cache_destroy(lio_dr_cache); + kmem_cache_destroy(lio_ooo_cache); + kmem_cache_destroy(lio_r2t_cache); + + iscsi_target_deregister_configfs(); + + kfree(iscsit_global); +} + +int iscsit_add_reject( + u8 reason, + int fail_conn, + unsigned char *buf, + struct iscsi_conn *conn) +{ + struct iscsi_cmd *cmd; + struct iscsi_reject *hdr; + int ret; + + cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); + if (!cmd) + return -1; + + cmd->iscsi_opcode = ISCSI_OP_REJECT; + if (fail_conn) + cmd->cmd_flags |= ICF_REJECT_FAIL_CONN; + + hdr = (struct iscsi_reject *) cmd->pdu; + hdr->reason = reason; + + cmd->buf_ptr = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL); + if (!cmd->buf_ptr) { + pr_err("Unable to allocate memory for cmd->buf_ptr\n"); + iscsit_release_cmd(cmd); + return -1; + } + memcpy(cmd->buf_ptr, buf, ISCSI_HDR_LEN); + + spin_lock_bh(&conn->cmd_lock); + list_add_tail(&cmd->i_list, &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); + + ret = wait_for_completion_interruptible(&cmd->reject_comp); + if (ret != 0) + return -1; + + return (!fail_conn) ? 0 : -1; +} + +int iscsit_add_reject_from_cmd( + u8 reason, + int fail_conn, + int add_to_conn, + unsigned char *buf, + struct iscsi_cmd *cmd) +{ + struct iscsi_conn *conn; + struct iscsi_reject *hdr; + int ret; + + 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; + if (fail_conn) + cmd->cmd_flags |= ICF_REJECT_FAIL_CONN; + + hdr = (struct iscsi_reject *) cmd->pdu; + hdr->reason = reason; + + cmd->buf_ptr = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL); + if (!cmd->buf_ptr) { + pr_err("Unable to allocate memory for cmd->buf_ptr\n"); + iscsit_release_cmd(cmd); + return -1; + } + memcpy(cmd->buf_ptr, buf, ISCSI_HDR_LEN); + + if (add_to_conn) { + spin_lock_bh(&conn->cmd_lock); + list_add_tail(&cmd->i_list, &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); + + ret = wait_for_completion_interruptible(&cmd->reject_comp); + if (ret != 0) + return -1; + + return (!fail_conn) ? 0 : -1; +} + +/* + * Map some portion of the allocated scatterlist to an iovec, suitable for + * kernel sockets to copy data in/out. This handles both pages and slab-allocated + * buffers, since we have been tricky and mapped t_mem_sg to the buffer in + * either case (see iscsit_alloc_buffs) + */ +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 have a private mapping of the allocated pages in t_mem_sg. + * At this point, we also know each contains a page. + */ + sg = &cmd->t_mem_sg[data_offset / PAGE_SIZE]; + 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) +{ + struct iscsi_cmd *cmd; + + conn->exp_statsn = exp_statsn; + + spin_lock_bh(&conn->cmd_lock); + list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) { + spin_lock(&cmd->istate_lock); + if ((cmd->i_state == ISTATE_SENT_STATUS) && + (cmd->stat_sn < exp_statsn)) { + cmd->i_state = ISTATE_REMOVE; + spin_unlock(&cmd->istate_lock); + iscsit_add_cmd_to_immediate_queue(cmd, conn, + cmd->i_state); + continue; + } + spin_unlock(&cmd->istate_lock); + } + spin_unlock_bh(&conn->cmd_lock); +} + +static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd) +{ + u32 iov_count = (cmd->se_cmd.t_data_nents == 0) ? 1 : + cmd->se_cmd.t_data_nents; + + iov_count += TRANSPORT_IOV_DATA_BUFFER; + + cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL); + if (!cmd->iov_data) { + pr_err("Unable to allocate cmd->iov_data\n"); + return -ENOMEM; + } + + cmd->orig_iov_data_count = iov_count; + return 0; +} + +static int iscsit_alloc_buffs(struct iscsi_cmd *cmd) +{ + struct scatterlist *sgl; + u32 length = cmd->se_cmd.data_length; + int nents = DIV_ROUND_UP(length, PAGE_SIZE); + int i = 0, ret; + /* + * If no SCSI payload is present, allocate the default iovecs used for + * iSCSI PDU Header + */ + if (!length) + return iscsit_allocate_iovecs(cmd); + + sgl = kzalloc(sizeof(*sgl) * nents, GFP_KERNEL); + if (!sgl) + return -ENOMEM; + + sg_init_table(sgl, nents); + + while (length) { + int buf_size = min_t(int, length, PAGE_SIZE); + struct page *page; + + page = alloc_page(GFP_KERNEL | __GFP_ZERO); + if (!page) + goto page_alloc_failed; + + sg_set_page(&sgl[i], page, buf_size, 0); + + length -= buf_size; + i++; + } + + cmd->t_mem_sg = sgl; + cmd->t_mem_sg_nents = nents; + + /* BIDI ops not supported */ + + /* Tell the core about our preallocated memory */ + transport_generic_map_mem_to_cmd(&cmd->se_cmd, sgl, nents, NULL, 0); + /* + * Allocate iovecs for SCSI payload after transport_generic_map_mem_to_cmd + * so that cmd->se_cmd.t_tasks_se_num has been set. + */ + ret = iscsit_allocate_iovecs(cmd); + if (ret < 0) + goto page_alloc_failed; + + return 0; + +page_alloc_failed: + while (i >= 0) { + __free_page(sg_page(&sgl[i])); + i--; + } + kfree(cmd->t_mem_sg); + cmd->t_mem_sg = NULL; + return -ENOMEM; +} + +static int iscsit_handle_scsi_cmd( + struct iscsi_conn *conn, + unsigned char *buf) +{ + int data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret; + int dump_immediate_data = 0, send_check_condition = 0, payload_length; + struct iscsi_cmd *cmd = NULL; + struct iscsi_scsi_req *hdr; + + spin_lock_bh(&conn->sess->session_stats_lock); + conn->sess->cmd_pdus++; + if (conn->sess->se_sess->se_node_acl) { + spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); + conn->sess->se_sess->se_node_acl->num_cmds++; + spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); + } + spin_unlock_bh(&conn->sess->session_stats_lock); + + hdr = (struct iscsi_scsi_req *) buf; + payload_length = ntoh24(hdr->dlength); + hdr->itt = be32_to_cpu(hdr->itt); + hdr->data_length = be32_to_cpu(hdr->data_length); + hdr->cmdsn = be32_to_cpu(hdr->cmdsn); + hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn); + + /* 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(ISCSI_REASON_BOOKMARK_INVALID, 1, + buf, conn); + } + + if (((hdr->flags & ISCSI_FLAG_CMD_READ) || + (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) { + /* + * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2) + * that adds support for RESERVE/RELEASE. There is a bug + * add with this new functionality that sets R/W bits when + * neither CDB carries any READ or WRITE datapayloads. + */ + if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) { + hdr->flags &= ~ISCSI_FLAG_CMD_READ; + hdr->flags &= ~ISCSI_FLAG_CMD_WRITE; + goto done; + } + + pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE" + " set when Expected Data Transfer Length is 0 for" + " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]); + return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, + buf, conn); + } +done: + + 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(ISCSI_REASON_BOOKMARK_INVALID, 1, + buf, conn); + } + + if ((hdr->flags & ISCSI_FLAG_CMD_READ) && + (hdr->flags & ISCSI_FLAG_CMD_WRITE)) { + pr_err("Bidirectional operations not supported!\n"); + return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, + buf, conn); + } + + if (hdr->opcode & ISCSI_OP_IMMEDIATE) { + pr_err("Illegally set Immediate Bit in iSCSI Initiator" + " Scsi Command PDU.\n"); + return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, + buf, conn); + } + + if (payload_length && !conn->sess->sess_ops->ImmediateData) { + pr_err("ImmediateData=No but DataSegmentLength=%u," + " protocol error.\n", payload_length); + return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, + buf, conn); + } + + if ((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(ISCSI_REASON_PROTOCOL_ERROR, 1, + buf, conn); + } + + if (payload_length > hdr->data_length) { + pr_err("DataSegmentLength: %u is greater than" + " EDTL: %u, protocol error.\n", payload_length, + hdr->data_length); + return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, + buf, conn); + } + + if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) { + pr_err("DataSegmentLength: %u is greater than" + " MaxRecvDataSegmentLength: %u, protocol error.\n", + payload_length, conn->conn_ops->MaxRecvDataSegmentLength); + return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, + buf, conn); + } + + 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(ISCSI_REASON_BOOKMARK_INVALID, 1, + buf, conn); + } + + data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : + (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : + DMA_NONE; + + cmd = iscsit_allocate_se_cmd(conn, hdr->data_length, data_direction, + (hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK)); + if (!cmd) + return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1, + buf, conn); + + pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," + " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, + hdr->cmdsn, hdr->data_length, payload_length, conn->cid); + + 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) { + spin_lock_bh(&conn->sess->ttt_lock); + cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; + if (cmd->targ_xfer_tag == 0xFFFFFFFF) + cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; + spin_unlock_bh(&conn->sess->ttt_lock); + } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE) + cmd->targ_xfer_tag = 0xFFFFFFFF; + cmd->cmd_sn = hdr->cmdsn; + cmd->exp_stat_sn = hdr->exp_statsn; + cmd->first_burst_len = payload_length; + + if (cmd->data_direction == DMA_FROM_DEVICE) { + struct iscsi_datain_req *dr; + + dr = iscsit_allocate_datain_req(); + if (!dr) + return iscsit_add_reject_from_cmd( + ISCSI_REASON_BOOKMARK_NO_RESOURCES, + 1, 1, buf, cmd); + + iscsit_attach_datain_req(cmd, dr); + } + + /* + * The CDB is going to an se_device_t. + */ + ret = iscsit_get_lun_for_cmd(cmd, hdr->cdb, + get_unaligned_le64(&hdr->lun)); + if (ret < 0) { + if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) { + pr_debug("Responding to non-acl'ed," + " non-existent or non-exported iSCSI LUN:" + " 0x%016Lx\n", get_unaligned_le64(&hdr->lun)); + } + if (ret == PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES) + return iscsit_add_reject_from_cmd( + ISCSI_REASON_BOOKMARK_NO_RESOURCES, + 1, 1, buf, cmd); + + send_check_condition = 1; + goto attach_cmd; + } + /* + * The Initiator Node has access to the LUN (the addressing method + * is handled inside of iscsit_get_lun_for_cmd()). Now it's time to + * allocate 1->N transport tasks (depending on sector count and + * maximum request size the physical HBA(s) can handle. + */ + transport_ret = transport_generic_allocate_tasks(&cmd->se_cmd, hdr->cdb); + if (transport_ret == -ENOMEM) { + return iscsit_add_reject_from_cmd( + ISCSI_REASON_BOOKMARK_NO_RESOURCES, + 1, 1, buf, cmd); + } else if (transport_ret == -EINVAL) { + /* + * Unsupported SAM Opcode. CHECK_CONDITION will be sent + * in iscsit_execute_cmd() during the CmdSN OOO Execution + * Mechinism. + */ + send_check_condition = 1; + } else { + if (iscsit_decide_list_to_build(cmd, payload_length) < 0) + return iscsit_add_reject_from_cmd( + ISCSI_REASON_BOOKMARK_NO_RESOURCES, + 1, 1, buf, cmd); + } + +attach_cmd: + spin_lock_bh(&conn->cmd_lock); + list_add_tail(&cmd->i_list, &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); + /* + * Allocate and setup SGL used with transport_generic_map_mem_to_cmd(). + * also call iscsit_allocate_iovecs() + */ + ret = iscsit_alloc_buffs(cmd); + if (ret < 0) + return iscsit_add_reject_from_cmd( + ISCSI_REASON_BOOKMARK_NO_RESOURCES, + 1, 1, buf, cmd); + /* + * 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, hdr->cmdsn); + if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) + return iscsit_add_reject_from_cmd( + ISCSI_REASON_PROTOCOL_ERROR, + 1, 0, buf, cmd); + } + + iscsit_ack_from_expstatsn(conn, hdr->exp_statsn); + + /* + * If no Immediate Data is attached, it's OK to return now. + */ + if (!cmd->immediate_data) { + if (send_check_condition) + return 0; + + if (cmd->unsolicited_data) { + 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); + } + + return 0; + } + + /* + * Early CHECK_CONDITIONs never make it to the transport processing + * thread. They are processed in CmdSN order by + * iscsit_check_received_cmdsn() below. + */ + if (send_check_condition) { + immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; + dump_immediate_data = 1; + goto after_immediate_data; + } + /* + * Call directly into transport_generic_new_cmd() to perform + * the backend memory allocation. + */ + ret = transport_generic_new_cmd(&cmd->se_cmd); + if ((ret < 0) || (cmd->se_cmd.se_cmd_flags & SCF_SE_CMD_FAILED)) { + immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; + dump_immediate_data = 1; + goto after_immediate_data; + } + + immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length); +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(conn, cmd, hdr->cmdsn); + /* + * Special case for Unsupported SAM WRITE Opcodes + * and ImmediateData=Yes. + */ + if (dump_immediate_data) { + if (iscsit_dump_data_payload(conn, payload_length, 1) < 0) + return -1; + } else if (cmd->unsolicited_data) { + 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); + } + + if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) + return iscsit_add_reject_from_cmd( + ISCSI_REASON_PROTOCOL_ERROR, + 1, 0, buf, 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, conn, cmd->i_state); + } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ + return -1; + + return 0; +} + +static u32 iscsit_do_crypto_hash_sg( + struct hash_desc *hash, + struct iscsi_cmd *cmd, + u32 data_offset, + u32 data_length, + u32 padding, + u8 *pad_bytes) +{ + u32 data_crc; + u32 i; + struct scatterlist *sg; + unsigned int page_off; + + crypto_hash_init(hash); + + sg = cmd->first_data_sg; + page_off = cmd->first_data_sg_off; + + i = 0; + while (data_length) { + u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off)); + + crypto_hash_update(hash, &sg[i], cur_len); + + data_length -= cur_len; + page_off = 0; + i++; + } + + if (padding) { + struct scatterlist pad_sg; + + sg_init_one(&pad_sg, pad_bytes, padding); + crypto_hash_update(hash, &pad_sg, padding); + } + crypto_hash_final(hash, (u8 *) &data_crc); + + return data_crc; +} + +static void iscsit_do_crypto_hash_buf( + struct hash_desc *hash, + unsigned char *buf, + u32 payload_length, + u32 padding, + u8 *pad_bytes, + u8 *data_crc) +{ + struct scatterlist sg; + + crypto_hash_init(hash); + + sg_init_one(&sg, (u8 *)buf, payload_length); + crypto_hash_update(hash, &sg, payload_length); + + if (padding) { + sg_init_one(&sg, pad_bytes, padding); + crypto_hash_update(hash, &sg, padding); + } + crypto_hash_final(hash, data_crc); +} + +static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) +{ + int iov_ret, ooo_cmdsn = 0, ret; + u8 data_crc_failed = 0; + u32 checksum, iov_count = 0, padding = 0, rx_got = 0; + u32 rx_size = 0, payload_length; + struct iscsi_cmd *cmd = NULL; + struct se_cmd *se_cmd; + struct iscsi_data *hdr; + struct kvec *iov; + unsigned long flags; + + hdr = (struct iscsi_data *) buf; + payload_length = ntoh24(hdr->dlength); + hdr->itt = be32_to_cpu(hdr->itt); + hdr->ttt = be32_to_cpu(hdr->ttt); + hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn); + hdr->datasn = be32_to_cpu(hdr->datasn); + hdr->offset = be32_to_cpu(hdr->offset); + + if (!payload_length) { + pr_err("DataOUT payload is ZERO, protocol error.\n"); + return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, + buf, conn); + } + + /* iSCSI write */ + spin_lock_bh(&conn->sess->session_stats_lock); + conn->sess->rx_data_octets += payload_length; + if (conn->sess->se_sess->se_node_acl) { + spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); + conn->sess->se_sess->se_node_acl->write_bytes += payload_length; + spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); + } + spin_unlock_bh(&conn->sess->session_stats_lock); + + if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) { + pr_err("DataSegmentLength: %u is greater than" + " MaxRecvDataSegmentLength: %u\n", payload_length, + conn->conn_ops->MaxRecvDataSegmentLength); + return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, + buf, conn); + } + + cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, + payload_length); + if (!cmd) + return 0; + + 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, 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_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR, + 1, 0, buf, cmd); + } + se_cmd = &cmd->se_cmd; + iscsit_mod_dataout_timer(cmd); + + if ((hdr->offset + payload_length) > cmd->data_length) { + pr_err("DataOut Offset: %u, Length %u greater than" + " iSCSI Command EDTL %u, protocol error.\n", + hdr->offset, payload_length, cmd->data_length); + return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID, + 1, 0, buf, cmd); + } + + 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... */ + spin_lock_irqsave(&se_cmd->t_state_lock, flags); + WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); + spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); + + spin_lock_irqsave(&se_cmd->t_state_lock, flags); + if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) || + (se_cmd->se_cmd_flags & SCF_SE_CMD_FAILED)) + dump_unsolicited_data = 1; + spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); + + 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 unsolicitied 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 (atomic_read(&se_cmd->t_transport_aborted) != 0) { + 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); + } + } + /* + * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and + * within-command recovery checks before receiving the payload. + */ + ret = iscsit_check_pre_dataout(cmd, buf); + if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY) + return 0; + else if (ret == DATAOUT_CANNOT_RECOVER) + return -1; + + rx_size += payload_length; + iov = &cmd->iov_data[0]; + + iov_ret = iscsit_map_iovec(cmd, iov, 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, + 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); + } + } + /* + * Increment post receive data and CRC values or perform + * within-command recovery. + */ + ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed); + if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)) + return 0; + else if (ret == DATAOUT_SEND_R2T) { + iscsit_set_dataout_sequence_values(cmd); + iscsit_build_r2ts_for_cmd(cmd, conn, 0); + } else if (ret == 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); + return (!ooo_cmdsn) ? transport_generic_handle_data( + &cmd->se_cmd) : 0; + } else /* DATAOUT_CANNOT_RECOVER */ + return -1; + + return 0; +} + +static int iscsit_handle_nop_out( + struct iscsi_conn *conn, + unsigned char *buf) +{ + unsigned char *ping_data = NULL; + int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size; + u32 checksum, data_crc, padding = 0, payload_length; + u64 lun; + struct iscsi_cmd *cmd = NULL; + struct kvec *iov = NULL; + struct iscsi_nopout *hdr; + + hdr = (struct iscsi_nopout *) buf; + payload_length = ntoh24(hdr->dlength); + lun = get_unaligned_le64(&hdr->lun); + hdr->itt = be32_to_cpu(hdr->itt); + hdr->ttt = be32_to_cpu(hdr->ttt); + hdr->cmdsn = be32_to_cpu(hdr->cmdsn); + hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn); + + if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { + pr_err("NOPOUT ITT is reserved, but Immediate Bit is" + " not set, protocol error.\n"); + return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, + buf, conn); + } + + if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) { + pr_err("NOPOUT Ping Data DataSegmentLength: %u is" + " greater than MaxRecvDataSegmentLength: %u, protocol" + " error.\n", payload_length, + conn->conn_ops->MaxRecvDataSegmentLength); + return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, + buf, conn); + } + + pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x," + " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", + (hdr->itt == 0xFFFFFFFF) ? "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 == 0xFFFFFFFF) { + cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); + if (!cmd) + return iscsit_add_reject( + ISCSI_REASON_BOOKMARK_NO_RESOURCES, + 1, buf, conn); + + 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 = hdr->cmdsn; + cmd->exp_stat_sn = hdr->exp_statsn; + cmd->data_direction = DMA_NONE; + } + + if (payload_length && (hdr->ttt == 0xFFFFFFFF)) { + rx_size = payload_length; + ping_data = kzalloc(payload_length + 1, GFP_KERNEL); + if (!ping_data) { + pr_err("Unable to allocate memory for" + " NOPOUT ping data.\n"); + 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 = (void *)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); + } + + if (hdr->itt != 0xFFFFFFFF) { + if (!cmd) { + pr_err("Checking CmdSN for NOPOUT," + " but cmd is NULL!\n"); + return -1; + } + /* + * Initiator is expecting a NopIN ping reply, + */ + spin_lock_bh(&conn->cmd_lock); + list_add_tail(&cmd->i_list, &conn->conn_cmd_list); + spin_unlock_bh(&conn->cmd_lock); + + iscsit_ack_from_expstatsn(conn, 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, hdr->cmdsn); + if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { + ret = 0; + goto ping_out; + } + if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) + return iscsit_add_reject_from_cmd( + ISCSI_REASON_PROTOCOL_ERROR, + 1, 0, buf, cmd); + + return 0; + } + + if (hdr->ttt != 0xFFFFFFFF) { + /* + * This was a response to a unsolicited NOPIN ping. + */ + cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt); + if (!cmd) + return -1; + + iscsit_stop_nopin_response_timer(conn); + + cmd->i_state = ISTATE_REMOVE; + iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state); + iscsit_start_nopin_timer(conn); + } else { + /* + * Initiator is not expecting a NOPIN is response. + * Just ignore for now. + * + * iSCSI v19-91 10.18 + * "A NOP-OUT may also be used to confirm a changed + * ExpStatSN if another PDU will not be available + * for a long time." + */ + ret = 0; + goto out; + } + + return 0; +out: + if (cmd) + iscsit_release_cmd(cmd); +ping_out: + kfree(ping_data); + return ret; +} + +static int iscsit_handle_task_mgt_cmd( + struct iscsi_conn *conn, + unsigned char *buf) +{ + struct iscsi_cmd *cmd; + struct se_tmr_req *se_tmr; + struct iscsi_tmr_req *tmr_req; + struct iscsi_tm *hdr; + u32 payload_length; + int out_of_order_cmdsn = 0; + int ret; + u8 function; + + hdr = (struct iscsi_tm *) buf; + payload_length = ntoh24(hdr->dlength); + hdr->itt = be32_to_cpu(hdr->itt); + hdr->rtt = be32_to_cpu(hdr->rtt); + hdr->cmdsn = be32_to_cpu(hdr->cmdsn); + hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn); + hdr->refcmdsn = be32_to_cpu(hdr->refcmdsn); + hdr->exp_datasn = be32_to_cpu(hdr->exp_datasn); + 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 != ISCSI_RESERVED_TAG))) { + pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); + hdr->rtt = ISCSI_RESERVED_TAG; + } + + 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(ISCSI_REASON_PROTOCOL_ERROR, 1, + buf, conn); + } + if ((function != ISCSI_TM_FUNC_ABORT_TASK) && + (hdr->refcmdsn != ISCSI_RESERVED_TAG)) + hdr->refcmdsn = ISCSI_RESERVED_TAG; + + cmd = iscsit_allocate_se_cmd_for_tmr(conn, function); + if (!cmd) + return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, + 1, buf, conn); + + 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 = hdr->cmdsn; + cmd->exp_stat_sn = 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 = iscsit_get_lun_for_tmr(cmd, + get_unaligned_le64(&hdr->lun)); + if (ret < 0) { + cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; + 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 != ISCSI_TMF_RSP_COMPLETE) { + cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; + 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) { + cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; + 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) { + cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; + 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 != ISCSI_TMF_RSP_COMPLETE) + break; + + if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) + return iscsit_add_reject_from_cmd( + ISCSI_REASON_BOOKMARK_INVALID, 1, 1, + buf, cmd); + break; + default: + pr_err("Unknown TMR function: 0x%02x, protocol" + " error.\n", function); + cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; + 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_list, &conn->conn_cmd_list); + spin_unlock_bh(&conn->cmd_lock); + + if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { + int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 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 { /* (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) */ + return iscsit_add_reject_from_cmd( + ISCSI_REASON_PROTOCOL_ERROR, + 1, 0, buf, cmd); + } + } + iscsit_ack_from_expstatsn(conn, hdr->exp_statsn); + + if (out_of_order_cmdsn) + return 0; + /* + * Found the referenced task, send to transport for processing. + */ + if (se_tmr->call_transport) + return transport_generic_handle_tmr(&cmd->se_cmd); + + /* + * Could not find the referenced LUN, task, or Task Management + * command not authorized or supported. Change state and + * let the tx_thread send the response. + * + * For connection recovery, this is also the default action for + * TMR TASK_REASSIGN. + */ + iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); + return 0; +} + +/* #warning FIXME: Support Text Command parameters besides SendTargets */ +static int iscsit_handle_text_cmd( + struct iscsi_conn *conn, + unsigned char *buf) +{ + char *text_ptr, *text_in; + int cmdsn_ret, niov = 0, rx_got, rx_size; + u32 checksum = 0, data_crc = 0, payload_length; + u32 padding = 0, pad_bytes = 0, text_length = 0; + struct iscsi_cmd *cmd; + struct kvec iov[3]; + struct iscsi_text *hdr; + + hdr = (struct iscsi_text *) buf; + payload_length = ntoh24(hdr->dlength); + hdr->itt = be32_to_cpu(hdr->itt); + hdr->ttt = be32_to_cpu(hdr->ttt); + hdr->cmdsn = be32_to_cpu(hdr->cmdsn); + hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn); + + if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) { + pr_err("Unable to accept text parameter length: %u" + "greater than MaxRecvDataSegmentLength %u.\n", + payload_length, conn->conn_ops->MaxRecvDataSegmentLength); + return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, + buf, conn); + } + + 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); + + rx_size = text_length = payload_length; + if (text_length) { + text_in = kzalloc(text_length, GFP_KERNEL); + if (!text_in) { + pr_err("Unable to allocate memory for" + " incoming text parameters\n"); + return -1; + } + + memset(iov, 0, 3 * sizeof(struct kvec)); + iov[niov].iov_base = text_in; + iov[niov++].iov_len = text_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) { + kfree(text_in); + return -1; + } + + if (conn->conn_ops->DataDigest) { + iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, + text_in, text_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"); + kfree(text_in); + return -1; + } 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, text_length); + } + } + text_in[text_length - 1] = '\0'; + pr_debug("Successfully read %d bytes of text" + " data.\n", text_length); + + if (strncmp("SendTargets", text_in, 11) != 0) { + pr_err("Received Text Data that is not" + " SendTargets, cannot continue.\n"); + kfree(text_in); + return -1; + } + text_ptr = strchr(text_in, '='); + if (!text_ptr) { + pr_err("No \"=\" separator found in Text Data," + " cannot continue.\n"); + kfree(text_in); + return -1; + } + if (strncmp("=All", text_ptr, 4) != 0) { + pr_err("Unable to locate All value for" + " SendTargets key, cannot continue.\n"); + kfree(text_in); + return -1; + } +/*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */ + kfree(text_in); + } + + cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); + if (!cmd) + return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, + 1, buf, conn); + + 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 = hdr->cmdsn; + cmd->exp_stat_sn = hdr->exp_statsn; + cmd->data_direction = DMA_NONE; + + spin_lock_bh(&conn->cmd_lock); + list_add_tail(&cmd->i_list, &conn->conn_cmd_list); + spin_unlock_bh(&conn->cmd_lock); + + iscsit_ack_from_expstatsn(conn, hdr->exp_statsn); + + if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { + cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); + if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) + return iscsit_add_reject_from_cmd( + ISCSI_REASON_PROTOCOL_ERROR, + 1, 0, buf, cmd); + + return 0; + } + + return iscsit_execute_cmd(cmd, 0); +} + +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; +} + +static int iscsit_handle_logout_cmd( + struct iscsi_conn *conn, + unsigned char *buf) +{ + int cmdsn_ret, logout_remove = 0; + u8 reason_code = 0; + struct iscsi_cmd *cmd; + struct iscsi_logout *hdr; + struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); + + hdr = (struct iscsi_logout *) buf; + reason_code = (hdr->flags & 0x7f); + hdr->itt = be32_to_cpu(hdr->itt); + hdr->cid = be16_to_cpu(hdr->cid); + hdr->cmdsn = be32_to_cpu(hdr->cmdsn); + hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn); + + 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"); + return 0; + } + + cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); + if (!cmd) + return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1, + buf, conn); + + 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 = hdr->cmdsn; + cmd->exp_stat_sn = hdr->exp_statsn; + cmd->logout_cid = 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) && + (hdr->cid == conn->cid))) + logout_remove = 1; + + spin_lock_bh(&conn->cmd_lock); + list_add_tail(&cmd->i_list, &conn->conn_cmd_list); + spin_unlock_bh(&conn->cmd_lock); + + if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) + iscsit_ack_from_expstatsn(conn, hdr->exp_statsn); + + /* + * Immediate commands are executed, well, immediately. + * Non-Immediate Logout Commands are executed in CmdSN order. + */ + if (hdr->opcode & ISCSI_OP_IMMEDIATE) { + int ret = iscsit_execute_cmd(cmd, 0); + + if (ret < 0) + return ret; + } else { + cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); + if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { + logout_remove = 0; + } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) { + return iscsit_add_reject_from_cmd( + ISCSI_REASON_PROTOCOL_ERROR, + 1, 0, buf, cmd); + } + } + + return logout_remove; +} + +static int iscsit_handle_snack( + struct iscsi_conn *conn, + unsigned char *buf) +{ + u32 unpacked_lun; + u64 lun; + struct iscsi_snack *hdr; + + hdr = (struct iscsi_snack *) buf; + hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; + lun = get_unaligned_le64(&hdr->lun); + unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun); + hdr->itt = be32_to_cpu(hdr->itt); + hdr->ttt = be32_to_cpu(hdr->ttt); + hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn); + hdr->begrun = be32_to_cpu(hdr->begrun); + hdr->runlength = be32_to_cpu(hdr->runlength); + + 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(ISCSI_REASON_PROTOCOL_ERROR, 1, + buf, conn); + } + /* + * 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, hdr->ttt, hdr->begrun, hdr->runlength); + case ISCSI_FLAG_SNACK_TYPE_STATUS: + return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt, + hdr->begrun, hdr->runlength); + case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: + return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun, + 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(ISCSI_REASON_PROTOCOL_ERROR, 1, + buf, conn); + default: + pr_err("Unknown SNACK type 0x%02x, protocol" + " error.\n", hdr->flags & 0x0f); + return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, + buf, conn); + } + + return 0; +} + +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, + unsigned char *buf, + 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_add_reject_from_cmd( + ISCSI_REASON_DATA_DIGEST_ERROR, + 1, 0, buf, cmd); + return IMMEDIATE_DATA_CANNOT_RECOVER; + } else { + iscsit_add_reject_from_cmd( + ISCSI_REASON_DATA_DIGEST_ERROR, + 0, 0, buf, cmd); + 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->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; + + /* + * 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); + break; + } + } + + if (!conn_p) + return; + + cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL); + 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_list, &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->tx_size = ISCSI_HDR_LEN; + 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 = 0xFFFFFFFF; + 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(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); + + if (conn->conn_ops->HeaderDigest) { + u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; + + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, + (unsigned char *)hdr, ISCSI_HDR_LEN, + 0, NULL, (u8 *)header_digest); + + cmd->tx_size += ISCSI_CRC_LEN; + pr_debug("Attaching CRC32C HeaderDigest to" + " Async Message 0x%08x\n", *header_digest); + } + + cmd->iov_misc[0].iov_base = cmd->pdu; + cmd->iov_misc[0].iov_len = cmd->tx_size; + cmd->iov_misc_count = 1; + + 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 0; +} + +static int iscsit_send_data_in( + struct iscsi_cmd *cmd, + struct iscsi_conn *conn, + int *eodr) +{ + int iov_ret = 0, set_statsn = 0; + u32 iov_count = 0, tx_size = 0; + struct iscsi_datain datain; + struct iscsi_datain_req *dr; + struct iscsi_data_rsp *hdr; + struct kvec *iov; + + 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->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->data_length); + return -1; + } + + spin_lock_bh(&conn->sess->session_stats_lock); + conn->sess->tx_data_octets += datain.length; + if (conn->sess->se_sess->se_node_acl) { + spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); + conn->sess->se_sess->se_node_acl->read_bytes += datain.length; + spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); + } + spin_unlock_bh(&conn->sess->session_stats_lock); + /* + * 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 = 1; + } else if (dr->dr_complete == + DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) + set_statsn = 1; + } + + hdr = (struct iscsi_data_rsp *) cmd->pdu; + memset(hdr, 0, ISCSI_HDR_LEN); + 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->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->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 = cpu_to_be32(cmd->init_task_tag); + hdr->ttt = (hdr->flags & ISCSI_FLAG_DATA_ACK) ? + cpu_to_be32(cmd->targ_xfer_tag) : + 0xFFFFFFFF; + hdr->statsn = (set_statsn) ? cpu_to_be32(cmd->stat_sn) : + 0xFFFFFFFF; + hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); + hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); + hdr->datasn = cpu_to_be32(datain.data_sn); + hdr->offset = cpu_to_be32(datain.offset); + + 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, + (unsigned char *)hdr, 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; + + 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); + + if (dr->dr_complete) { + *eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? + 2 : 1; + iscsit_free_datain_req(cmd, dr); + } + + return 0; +} + +static int iscsit_send_logout_response( + struct iscsi_cmd *cmd, + struct iscsi_conn *conn) +{ + int niov = 0, tx_size; + struct iscsi_conn *logout_conn = NULL; + struct iscsi_conn_recovery *cr = NULL; + struct iscsi_session *sess = conn->sess; + struct kvec *iov; + struct iscsi_logout_rsp *hdr; + /* + * 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; + } + + tx_size = ISCSI_HDR_LEN; + hdr = (struct iscsi_logout_rsp *)cmd->pdu; + memset(hdr, 0, ISCSI_HDR_LEN); + hdr->opcode = ISCSI_OP_LOGOUT_RSP; + hdr->flags |= ISCSI_FLAG_CMD_FINAL; + hdr->response = cmd->logout_response; + hdr->itt = cpu_to_be32(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(conn->sess->max_cmd_sn); + + 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, + (unsigned char *)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" + " Logout Response 0x%08x\n", *header_digest); + } + cmd->iov_misc_count = niov; + cmd->tx_size = tx_size; + + pr_debug("Sending 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; +} + +/* + * 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) +{ + int tx_size = ISCSI_HDR_LEN; + struct iscsi_nopin *hdr; + + hdr = (struct iscsi_nopin *) cmd->pdu; + memset(hdr, 0, ISCSI_HDR_LEN); + hdr->opcode = ISCSI_OP_NOOP_IN; + hdr->flags |= ISCSI_FLAG_CMD_FINAL; + hdr->itt = cpu_to_be32(cmd->init_task_tag); + hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); + cmd->stat_sn = conn->stat_sn; + hdr->statsn = cpu_to_be32(cmd->stat_sn); + hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); + hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); + + if (conn->conn_ops->HeaderDigest) { + u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; + + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, + (unsigned char *)hdr, ISCSI_HDR_LEN, + 0, NULL, (u8 *)header_digest); + + tx_size += ISCSI_CRC_LEN; + pr_debug("Attaching CRC32C HeaderDigest to" + " NopIN 0x%08x\n", *header_digest); + } + + cmd->iov_misc[0].iov_base = cmd->pdu; + cmd->iov_misc[0].iov_len = tx_size; + cmd->iov_misc_count = 1; + cmd->tx_size = tx_size; + + pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" + " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); + + return 0; +} + +static int iscsit_send_nopin_response( + struct iscsi_cmd *cmd, + struct iscsi_conn *conn) +{ + int niov = 0, tx_size; + u32 padding = 0; + struct kvec *iov; + struct iscsi_nopin *hdr; + + tx_size = ISCSI_HDR_LEN; + hdr = (struct iscsi_nopin *) cmd->pdu; + memset(hdr, 0, ISCSI_HDR_LEN); + hdr->opcode = ISCSI_OP_NOOP_IN; + hdr->flags |= ISCSI_FLAG_CMD_FINAL; + hton24(hdr->dlength, cmd->buf_ptr_size); + put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); + hdr->itt = cpu_to_be32(cmd->init_task_tag); + hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); + cmd->stat_sn = conn->stat_sn++; + hdr->statsn = cpu_to_be32(cmd->stat_sn); + + iscsit_increment_maxcmdsn(cmd, conn->sess); + hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); + hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); + + 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, + (unsigned char *)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 NopIn 0x%08x\n", *header_digest); + } + + /* + * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. + * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. + */ + if (cmd->buf_ptr_size) { + iov[niov].iov_base = cmd->buf_ptr; + iov[niov++].iov_len = cmd->buf_ptr_size; + tx_size += cmd->buf_ptr_size; + + pr_debug("Echoing back %u bytes of ping" + " data.\n", cmd->buf_ptr_size); + + padding = ((-cmd->buf_ptr_size) & 3); + 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, + cmd->buf_ptr, cmd->buf_ptr_size, + 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 of ping data, CRC 0x%08x\n", + cmd->buf_ptr_size, cmd->data_crc); + } + } + + cmd->iov_misc_count = niov; + cmd->tx_size = tx_size; + + pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:" + " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag, + cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); + + return 0; +} + +int iscsit_send_r2t( + struct iscsi_cmd *cmd, + struct iscsi_conn *conn) +{ + int tx_size = 0; + struct iscsi_r2t *r2t; + struct iscsi_r2t_rsp *hdr; + + 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 = cpu_to_be32(cmd->init_task_tag); + spin_lock_bh(&conn->sess->ttt_lock); + r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++; + if (r2t->targ_xfer_tag == 0xFFFFFFFF) + r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++; + spin_unlock_bh(&conn->sess->ttt_lock); + hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); + hdr->statsn = cpu_to_be32(conn->stat_sn); + hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); + hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); + hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); + hdr->data_offset = cpu_to_be32(r2t->offset); + hdr->data_length = cpu_to_be32(r2t->xfer_len); + + cmd->iov_misc[0].iov_base = cmd->pdu; + cmd->iov_misc[0].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, + (unsigned char *)hdr, ISCSI_HDR_LEN, + 0, NULL, (u8 *)header_digest); + + cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; + tx_size += ISCSI_CRC_LEN; + pr_debug("Attaching CRC32 HeaderDigest for R2T" + " PDU 0x%08x\n", *header_digest); + } + + pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" + " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", + (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, + r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, + r2t->offset, r2t->xfer_len, conn->cid); + + cmd->iov_misc_count = 1; + cmd->tx_size = tx_size; + + spin_lock_bh(&cmd->r2t_lock); + r2t->sent_r2t = 1; + spin_unlock_bh(&cmd->r2t_lock); + + return 0; +} + +/* + * type 0: Normal Operation. + * type 1: Called from Storage Transport. + * type 2: Called from iscsi_task_reassign_complete_write() for + * connection recovery. + */ +int iscsit_build_r2ts_for_cmd( + struct iscsi_cmd *cmd, + struct iscsi_conn *conn, + int type) +{ + int first_r2t = 1; + u32 offset = 0, xfer_len = 0; + + spin_lock_bh(&cmd->r2t_lock); + if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { + spin_unlock_bh(&cmd->r2t_lock); + return 0; + } + + if (conn->sess->sess_ops->DataSequenceInOrder && (type != 2)) + if (cmd->r2t_offset < cmd->write_data_done) + cmd->r2t_offset = cmd->write_data_done; + + while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { + if (conn->sess->sess_ops->DataSequenceInOrder) { + offset = cmd->r2t_offset; + + if (first_r2t && (type == 2)) { + xfer_len = ((offset + + (conn->sess->sess_ops->MaxBurstLength - + cmd->next_burst_len) > + cmd->data_length) ? + (cmd->data_length - offset) : + (conn->sess->sess_ops->MaxBurstLength - + cmd->next_burst_len)); + } else { + xfer_len = ((offset + + conn->sess->sess_ops->MaxBurstLength) > + cmd->data_length) ? + (cmd->data_length - offset) : + conn->sess->sess_ops->MaxBurstLength; + } + cmd->r2t_offset += xfer_len; + + if (cmd->r2t_offset == cmd->data_length) + cmd->cmd_flags |= ICF_SENT_LAST_R2T; + } else { + struct iscsi_seq *seq; + + seq = iscsit_get_seq_holder_for_r2t(cmd); + if (!seq) { + spin_unlock_bh(&cmd->r2t_lock); + return -1; + } + + offset = seq->offset; + xfer_len = seq->xfer_len; + + if (cmd->seq_send_order == cmd->seq_count) + cmd->cmd_flags |= ICF_SENT_LAST_R2T; + } + cmd->outstanding_r2ts++; + first_r2t = 0; + + if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { + spin_unlock_bh(&cmd->r2t_lock); + return -1; + } + + if (cmd->cmd_flags & ICF_SENT_LAST_R2T) + break; + } + spin_unlock_bh(&cmd->r2t_lock); + + return 0; +} + +static int iscsit_send_status( + struct iscsi_cmd *cmd, + struct iscsi_conn *conn) +{ + u8 iov_count = 0, recovery; + u32 padding = 0, tx_size = 0; + struct iscsi_scsi_rsp *hdr; + struct kvec *iov; + + recovery = (cmd->i_state != ISTATE_SEND_STATUS); + if (!recovery) + cmd->stat_sn = conn->stat_sn++; + + spin_lock_bh(&conn->sess->session_stats_lock); + conn->sess->rsp_pdus++; + spin_unlock_bh(&conn->sess->session_stats_lock); + + hdr = (struct iscsi_scsi_rsp *) cmd->pdu; + memset(hdr, 0, ISCSI_HDR_LEN); + hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; + hdr->flags |= ISCSI_FLAG_CMD_FINAL; + if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { + hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; + hdr->residual_count = cpu_to_be32(cmd->residual_count); + } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { + hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; + hdr->residual_count = cpu_to_be32(cmd->residual_count); + } + hdr->response = cmd->iscsi_response; + hdr->cmd_status = cmd->se_cmd.scsi_status; + hdr->itt = cpu_to_be32(cmd->init_task_tag); + hdr->statsn = cpu_to_be32(cmd->stat_sn); + + iscsit_increment_maxcmdsn(cmd, conn->sess); + hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); + hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); + + iov = &cmd->iov_misc[0]; + iov[iov_count].iov_base = cmd->pdu; + iov[iov_count++].iov_len = ISCSI_HDR_LEN; + tx_size += ISCSI_HDR_LEN; + + /* + * Attach SENSE DATA payload to iSCSI Response PDU + */ + if (cmd->se_cmd.sense_buffer && + ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || + (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { + padding = -(cmd->se_cmd.scsi_sense_length) & 3; + hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length); + iov[iov_count].iov_base = cmd->se_cmd.sense_buffer; + iov[iov_count++].iov_len = + (cmd->se_cmd.scsi_sense_length + padding); + tx_size += cmd->se_cmd.scsi_sense_length; + + if (padding) { + memset(cmd->se_cmd.sense_buffer + + cmd->se_cmd.scsi_sense_length, 0, padding); + tx_size += padding; + pr_debug("Adding %u bytes of padding to" + " SENSE.\n", padding); + } + + if (conn->conn_ops->DataDigest) { + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, + cmd->se_cmd.sense_buffer, + (cmd->se_cmd.scsi_sense_length + padding), + 0, NULL, (u8 *)&cmd->data_crc); + + iov[iov_count].iov_base = &cmd->data_crc; + iov[iov_count++].iov_len = ISCSI_CRC_LEN; + tx_size += ISCSI_CRC_LEN; + + pr_debug("Attaching CRC32 DataDigest for" + " SENSE, %u bytes CRC 0x%08x\n", + (cmd->se_cmd.scsi_sense_length + padding), + cmd->data_crc); + } + + pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" + " Response PDU\n", + cmd->se_cmd.scsi_sense_length); + } + + if (conn->conn_ops->HeaderDigest) { + u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; + + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, + (unsigned char *)hdr, 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 Response" + " PDU 0x%08x\n", *header_digest); + } + + cmd->iov_misc_count = iov_count; + cmd->tx_size = tx_size; + + pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x," + " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", + (!recovery) ? "" : "Recovery ", cmd->init_task_tag, + cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid); + + return 0; +} + +static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) +{ + switch (se_tmr->response) { + case TMR_FUNCTION_COMPLETE: + return ISCSI_TMF_RSP_COMPLETE; + case TMR_TASK_DOES_NOT_EXIST: + return ISCSI_TMF_RSP_NO_TASK; + case TMR_LUN_DOES_NOT_EXIST: + return ISCSI_TMF_RSP_NO_LUN; + case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: + return ISCSI_TMF_RSP_NOT_SUPPORTED; + case TMR_FUNCTION_AUTHORIZATION_FAILED: + return ISCSI_TMF_RSP_AUTH_FAILED; + case TMR_FUNCTION_REJECTED: + default: + return ISCSI_TMF_RSP_REJECTED; + } +} + +static int iscsit_send_task_mgt_rsp( + struct iscsi_cmd *cmd, + struct iscsi_conn *conn) +{ + struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; + struct iscsi_tm_rsp *hdr; + u32 tx_size = 0; + + hdr = (struct iscsi_tm_rsp *) cmd->pdu; + memset(hdr, 0, ISCSI_HDR_LEN); + hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; + hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); + hdr->itt = cpu_to_be32(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(conn->sess->max_cmd_sn); + + cmd->iov_misc[0].iov_base = cmd->pdu; + cmd->iov_misc[0].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, + (unsigned char *)hdr, ISCSI_HDR_LEN, + 0, NULL, (u8 *)header_digest); + + cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; + tx_size += ISCSI_CRC_LEN; + pr_debug("Attaching CRC32 HeaderDigest for Task" + " Mgmt Response PDU 0x%08x\n", *header_digest); + } + + cmd->iov_misc_count = 1; + cmd->tx_size = tx_size; + + pr_debug("Built Task Management Response ITT: 0x%08x," + " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", + cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); + + return 0; +} + +static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd) +{ + char *payload = NULL; + struct iscsi_conn *conn = cmd->conn; + struct iscsi_portal_group *tpg; + struct iscsi_tiqn *tiqn; + struct iscsi_tpg_np *tpg_np; + int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; + unsigned char buf[256]; + + buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ? + 32768 : conn->conn_ops->MaxRecvDataSegmentLength; + + memset(buf, 0, 256); + + payload = kzalloc(buffer_len, GFP_KERNEL); + if (!payload) { + pr_err("Unable to allocate memory for sendtargets" + " response.\n"); + return -ENOMEM; + } + + spin_lock(&tiqn_lock); + list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { + len = sprintf(buf, "TargetName=%s", tiqn->tiqn); + len += 1; + + if ((len + payload_len) > buffer_len) { + spin_unlock(&tiqn->tiqn_tpg_lock); + end_of_buf = 1; + goto eob; + } + memcpy((void *)payload + payload_len, buf, len); + payload_len += len; + + spin_lock(&tiqn->tiqn_tpg_lock); + list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { + + spin_lock(&tpg->tpg_state_lock); + if ((tpg->tpg_state == TPG_STATE_FREE) || + (tpg->tpg_state == TPG_STATE_INACTIVE)) { + spin_unlock(&tpg->tpg_state_lock); + continue; + } + spin_unlock(&tpg->tpg_state_lock); + + spin_lock(&tpg->tpg_np_lock); + list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, + tpg_np_list) { + len = sprintf(buf, "TargetAddress=" + "%s%s%s:%hu,%hu", + (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ? + "[" : "", tpg_np->tpg_np->np_ip, + (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ? + "]" : "", tpg_np->tpg_np->np_port, + tpg->tpgt); + len += 1; + + if ((len + payload_len) > buffer_len) { + spin_unlock(&tpg->tpg_np_lock); + spin_unlock(&tiqn->tiqn_tpg_lock); + end_of_buf = 1; + goto eob; + } + memcpy((void *)payload + payload_len, buf, len); + payload_len += len; + } + spin_unlock(&tpg->tpg_np_lock); + } + spin_unlock(&tiqn->tiqn_tpg_lock); +eob: + if (end_of_buf) + break; + } + spin_unlock(&tiqn_lock); + + cmd->buf_ptr = payload; + + return payload_len; +} + +/* + * FIXME: Add support for F_BIT and C_BIT when the length is longer than + * MaxRecvDataSegmentLength. + */ +static int iscsit_send_text_rsp( + struct iscsi_cmd *cmd, + struct iscsi_conn *conn) +{ + struct iscsi_text_rsp *hdr; + struct kvec *iov; + u32 padding = 0, tx_size = 0; + int text_length, iov_count = 0; + + text_length = iscsit_build_sendtargets_response(cmd); + if (text_length < 0) + return text_length; + + padding = ((-text_length) & 3); + if (padding != 0) { + memset(cmd->buf_ptr + text_length, 0, padding); + pr_debug("Attaching %u additional bytes for" + " padding.\n", padding); + } + + hdr = (struct iscsi_text_rsp *) cmd->pdu; + memset(hdr, 0, ISCSI_HDR_LEN); + hdr->opcode = ISCSI_OP_TEXT_RSP; + hdr->flags |= ISCSI_FLAG_CMD_FINAL; + hton24(hdr->dlength, text_length); + hdr->itt = cpu_to_be32(cmd->init_task_tag); + hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); + cmd->stat_sn = conn->stat_sn++; + hdr->statsn = cpu_to_be32(cmd->stat_sn); + + iscsit_increment_maxcmdsn(cmd, conn->sess); + hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); + hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); + + iov = &cmd->iov_misc[0]; + + iov[iov_count].iov_base = cmd->pdu; + iov[iov_count++].iov_len = ISCSI_HDR_LEN; + iov[iov_count].iov_base = cmd->buf_ptr; + iov[iov_count++].iov_len = text_length + padding; + + tx_size += (ISCSI_HDR_LEN + text_length + padding); + + if (conn->conn_ops->HeaderDigest) { + u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; + + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, + (unsigned char *)hdr, 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" + " Text Response PDU 0x%08x\n", *header_digest); + } + + if (conn->conn_ops->DataDigest) { + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, + cmd->buf_ptr, (text_length + padding), + 0, NULL, (u8 *)&cmd->data_crc); + + iov[iov_count].iov_base = &cmd->data_crc; + iov[iov_count++].iov_len = ISCSI_CRC_LEN; + tx_size += ISCSI_CRC_LEN; + + pr_debug("Attaching DataDigest for %u bytes of text" + " data, CRC 0x%08x\n", (text_length + padding), + cmd->data_crc); + } + + cmd->iov_misc_count = iov_count; + cmd->tx_size = tx_size; + + pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x," + " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn, + text_length, conn->cid); + return 0; +} + +static int iscsit_send_reject( + struct iscsi_cmd *cmd, + struct iscsi_conn *conn) +{ + u32 iov_count = 0, tx_size = 0; + struct iscsi_reject *hdr; + struct kvec *iov; + + hdr = (struct iscsi_reject *) cmd->pdu; + hdr->opcode = ISCSI_OP_REJECT; + hdr->flags |= ISCSI_FLAG_CMD_FINAL; + hton24(hdr->dlength, ISCSI_HDR_LEN); + 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(conn->sess->max_cmd_sn); + + iov = &cmd->iov_misc[0]; + + iov[iov_count].iov_base = cmd->pdu; + iov[iov_count++].iov_len = ISCSI_HDR_LEN; + iov[iov_count].iov_base = cmd->buf_ptr; + iov[iov_count++].iov_len = ISCSI_HDR_LEN; + + tx_size = (ISCSI_HDR_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, + (unsigned char *)hdr, 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" + " REJECT PDU 0x%08x\n", *header_digest); + } + + if (conn->conn_ops->DataDigest) { + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, + (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN, + 0, NULL, (u8 *)&cmd->data_crc); + + iov[iov_count].iov_base = &cmd->data_crc; + iov[iov_count++].iov_len = ISCSI_CRC_LEN; + tx_size += ISCSI_CRC_LEN; + pr_debug("Attaching CRC32 DataDigest for REJECT" + " PDU 0x%08x\n", cmd->data_crc); + } + + cmd->iov_misc_count = iov_count; + cmd->tx_size = tx_size; + + pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," + " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); + + return 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); + } +} + +#ifdef CONFIG_SMP + +void iscsit_thread_get_cpumask(struct iscsi_conn *conn) +{ + struct iscsi_thread_set *ts = conn->thread_set; + int ord, cpu; + /* + * thread_id is assigned from iscsit_global->ts_bitmap from + * within iscsi_thread_set.c:iscsi_allocate_thread_sets() + * + * Here we use thread_id to determine which CPU that this + * iSCSI connection's iscsi_thread_set will be scheduled to + * execute upon. + */ + ord = ts->thread_id % cpumask_weight(cpu_online_mask); +#if 0 + pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from" + " thread_id: %d\n", ord, ts->thread_id); +#endif + for_each_online_cpu(cpu) { + if (ord-- == 0) { + cpumask_set_cpu(cpu, conn->conn_cpumask); + return; + } + } + /* + * This should never be reached.. + */ + dump_stack(); + cpumask_setall(conn->conn_cpumask); +} + +static inline void iscsit_thread_check_cpumask( + struct iscsi_conn *conn, + struct task_struct *p, + int mode) +{ + char buf[128]; + /* + * mode == 1 signals iscsi_target_tx_thread() usage. + * mode == 0 signals iscsi_target_rx_thread() usage. + */ + if (mode == 1) { + if (!conn->conn_tx_reset_cpumask) + return; + conn->conn_tx_reset_cpumask = 0; + } else { + if (!conn->conn_rx_reset_cpumask) + return; + conn->conn_rx_reset_cpumask = 0; + } + /* + * Update the CPU mask for this single kthread so that + * both TX and RX kthreads are scheduled to run on the + * same CPU. + */ + memset(buf, 0, 128); + cpumask_scnprintf(buf, 128, conn->conn_cpumask); +#if 0 + pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():" + " %s for %s\n", buf, p->comm); +#endif + set_cpus_allowed_ptr(p, conn->conn_cpumask); +} + +#else + +void iscsit_thread_get_cpumask(struct iscsi_conn *conn) +{ + return; +} + +#define iscsit_thread_check_cpumask(X, Y, Z) ({}) +#endif /* CONFIG_SMP */ + +int iscsi_target_tx_thread(void *arg) +{ + u8 state; + int eodr = 0; + int ret = 0; + int sent_status = 0; + int use_misc = 0; + int map_sg = 0; + struct iscsi_cmd *cmd = NULL; + struct iscsi_conn *conn; + struct iscsi_queue_req *qr = NULL; + struct se_cmd *se_cmd; + struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg; + /* + * Allow ourselves to be interrupted by SIGINT so that a + * connection recovery / failure event can be triggered externally. + */ + allow_signal(SIGINT); + +restart: + conn = iscsi_tx_thread_pre_handler(ts); + if (!conn) + goto out; + + eodr = map_sg = ret = sent_status = use_misc = 0; + + while (!kthread_should_stop()) { + /* + * Ensure that both TX and RX per connection kthreads + * are scheduled to run on the same CPU. + */ + iscsit_thread_check_cpumask(conn, current, 1); + + schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT); + + if ((ts->status == ISCSI_THREAD_SET_RESET) || + signal_pending(current)) + goto transport_err; + +get_immediate: + qr = iscsit_get_cmd_from_immediate_queue(conn); + if (qr) { + atomic_set(&conn->check_immediate_queue, 0); + cmd = qr->cmd; + state = qr->state; + kmem_cache_free(lio_qr_cache, qr); + + spin_lock_bh(&cmd->istate_lock); + switch (state) { + case ISTATE_SEND_R2T: + spin_unlock_bh(&cmd->istate_lock); + ret = iscsit_send_r2t(cmd, conn); + break; + case ISTATE_REMOVE: + spin_unlock_bh(&cmd->istate_lock); + + if (cmd->data_direction == DMA_TO_DEVICE) + iscsit_stop_dataout_timer(cmd); + + spin_lock_bh(&conn->cmd_lock); + list_del(&cmd->i_list); + spin_unlock_bh(&conn->cmd_lock); + /* + * Determine if a struct se_cmd is assoicated with + * this struct iscsi_cmd. + */ + if (!(cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD) && + !(cmd->tmr_req)) + iscsit_release_cmd(cmd); + else + transport_generic_free_cmd(&cmd->se_cmd, + 1, 0); + goto get_immediate; + case ISTATE_SEND_NOPIN_WANT_RESPONSE: + spin_unlock_bh(&cmd->istate_lock); + iscsit_mod_nopin_response_timer(conn); + ret = iscsit_send_unsolicited_nopin(cmd, + conn, 1); + break; + case ISTATE_SEND_NOPIN_NO_RESPONSE: + spin_unlock_bh(&cmd->istate_lock); + ret = iscsit_send_unsolicited_nopin(cmd, + conn, 0); + break; + default: + pr_err("Unknown Opcode: 0x%02x ITT:" + " 0x%08x, i_state: %d on CID: %hu\n", + cmd->iscsi_opcode, cmd->init_task_tag, state, + conn->cid); + spin_unlock_bh(&cmd->istate_lock); + goto transport_err; + } + if (ret < 0) { + conn->tx_immediate_queue = 0; + goto transport_err; + } + + if (iscsit_send_tx_data(cmd, conn, 1) < 0) { + conn->tx_immediate_queue = 0; + iscsit_tx_thread_wait_for_tcp(conn); + goto transport_err; + } + + spin_lock_bh(&cmd->istate_lock); + switch (state) { + case ISTATE_SEND_R2T: + spin_unlock_bh(&cmd->istate_lock); + spin_lock_bh(&cmd->dataout_timeout_lock); + iscsit_start_dataout_timer(cmd, conn); + spin_unlock_bh(&cmd->dataout_timeout_lock); + break; + case ISTATE_SEND_NOPIN_WANT_RESPONSE: + cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE; + spin_unlock_bh(&cmd->istate_lock); + break; + case ISTATE_SEND_NOPIN_NO_RESPONSE: + cmd->i_state = ISTATE_SENT_STATUS; + spin_unlock_bh(&cmd->istate_lock); + break; + default: + pr_err("Unknown Opcode: 0x%02x ITT:" + " 0x%08x, i_state: %d on CID: %hu\n", + cmd->iscsi_opcode, cmd->init_task_tag, + state, conn->cid); + spin_unlock_bh(&cmd->istate_lock); + goto transport_err; + } + goto get_immediate; + } else + conn->tx_immediate_queue = 0; + +get_response: + qr = iscsit_get_cmd_from_response_queue(conn); + if (qr) { + cmd = qr->cmd; + state = qr->state; + kmem_cache_free(lio_qr_cache, qr); + + spin_lock_bh(&cmd->istate_lock); +check_rsp_state: + switch (state) { + case ISTATE_SEND_DATAIN: + spin_unlock_bh(&cmd->istate_lock); + ret = iscsit_send_data_in(cmd, conn, + &eodr); + map_sg = 1; + break; + case ISTATE_SEND_STATUS: + case ISTATE_SEND_STATUS_RECOVERY: + spin_unlock_bh(&cmd->istate_lock); + use_misc = 1; + ret = iscsit_send_status(cmd, conn); + break; + case ISTATE_SEND_LOGOUTRSP: + spin_unlock_bh(&cmd->istate_lock); + use_misc = 1; + ret = iscsit_send_logout_response(cmd, conn); + break; + case ISTATE_SEND_ASYNCMSG: + spin_unlock_bh(&cmd->istate_lock); + use_misc = 1; + ret = iscsit_send_conn_drop_async_message( + cmd, conn); + break; + case ISTATE_SEND_NOPIN: + spin_unlock_bh(&cmd->istate_lock); + use_misc = 1; + ret = iscsit_send_nopin_response(cmd, conn); + break; + case ISTATE_SEND_REJECT: + spin_unlock_bh(&cmd->istate_lock); + use_misc = 1; + ret = iscsit_send_reject(cmd, conn); + break; + case ISTATE_SEND_TASKMGTRSP: + spin_unlock_bh(&cmd->istate_lock); + use_misc = 1; + ret = iscsit_send_task_mgt_rsp(cmd, conn); + if (ret != 0) + break; + ret = iscsit_tmr_post_handler(cmd, conn); + if (ret != 0) + iscsit_fall_back_to_erl0(conn->sess); + break; + case ISTATE_SEND_TEXTRSP: + spin_unlock_bh(&cmd->istate_lock); + use_misc = 1; + ret = iscsit_send_text_rsp(cmd, conn); + break; + default: + pr_err("Unknown Opcode: 0x%02x ITT:" + " 0x%08x, i_state: %d on CID: %hu\n", + cmd->iscsi_opcode, cmd->init_task_tag, + state, conn->cid); + spin_unlock_bh(&cmd->istate_lock); + goto transport_err; + } + if (ret < 0) { + conn->tx_response_queue = 0; + goto transport_err; + } + + se_cmd = &cmd->se_cmd; + + if (map_sg && !conn->conn_ops->IFMarker) { + if (iscsit_fe_sendpage_sg(cmd, conn) < 0) { + conn->tx_response_queue = 0; + iscsit_tx_thread_wait_for_tcp(conn); + iscsit_unmap_iovec(cmd); + goto transport_err; + } + } else { + if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) { + conn->tx_response_queue = 0; + iscsit_tx_thread_wait_for_tcp(conn); + iscsit_unmap_iovec(cmd); + goto transport_err; + } + } + map_sg = 0; + iscsit_unmap_iovec(cmd); + + spin_lock_bh(&cmd->istate_lock); + switch (state) { + case ISTATE_SEND_DATAIN: + if (!eodr) + goto check_rsp_state; + + if (eodr == 1) { + cmd->i_state = ISTATE_SENT_LAST_DATAIN; + sent_status = 1; + eodr = use_misc = 0; + } else if (eodr == 2) { + cmd->i_state = state = + ISTATE_SEND_STATUS; + sent_status = 0; + eodr = use_misc = 0; + goto check_rsp_state; + } + break; + case ISTATE_SEND_STATUS: + use_misc = 0; + sent_status = 1; + break; + case ISTATE_SEND_ASYNCMSG: + case ISTATE_SEND_NOPIN: + case ISTATE_SEND_STATUS_RECOVERY: + case ISTATE_SEND_TEXTRSP: + use_misc = 0; + sent_status = 1; + break; + case ISTATE_SEND_REJECT: + use_misc = 0; + if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) { + cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN; + spin_unlock_bh(&cmd->istate_lock); + complete(&cmd->reject_comp); + goto transport_err; + } + complete(&cmd->reject_comp); + break; + case ISTATE_SEND_TASKMGTRSP: + use_misc = 0; + sent_status = 1; + break; + case ISTATE_SEND_LOGOUTRSP: + spin_unlock_bh(&cmd->istate_lock); + if (!iscsit_logout_post_handler(cmd, conn)) + goto restart; + spin_lock_bh(&cmd->istate_lock); + use_misc = 0; + sent_status = 1; + break; + default: + pr_err("Unknown Opcode: 0x%02x ITT:" + " 0x%08x, i_state: %d on CID: %hu\n", + cmd->iscsi_opcode, cmd->init_task_tag, + cmd->i_state, conn->cid); + spin_unlock_bh(&cmd->istate_lock); + goto transport_err; + } + + if (sent_status) { + cmd->i_state = ISTATE_SENT_STATUS; + sent_status = 0; + } + spin_unlock_bh(&cmd->istate_lock); + + if (atomic_read(&conn->check_immediate_queue)) + goto get_immediate; + + goto get_response; + } else + conn->tx_response_queue = 0; + } + +transport_err: + iscsit_take_action_for_connection_exit(conn); + goto restart; +out: + return 0; +} + +int iscsi_target_rx_thread(void *arg) +{ + int ret; + u8 buffer[ISCSI_HDR_LEN], opcode; + u32 checksum = 0, digest = 0; + struct iscsi_conn *conn = NULL; + struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg; + struct kvec iov; + /* + * Allow ourselves to be interrupted by SIGINT so that a + * connection recovery / failure event can be triggered externally. + */ + allow_signal(SIGINT); + +restart: + conn = iscsi_rx_thread_pre_handler(ts); + if (!conn) + goto out; + + while (!kthread_should_stop()) { + /* + * Ensure that both TX and RX per connection kthreads + * are scheduled to run on the same CPU. + */ + iscsit_thread_check_cpumask(conn, current, 0); + + memset(buffer, 0, ISCSI_HDR_LEN); + memset(&iov, 0, sizeof(struct kvec)); + + iov.iov_base = buffer; + iov.iov_len = ISCSI_HDR_LEN; + + ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); + if (ret != ISCSI_HDR_LEN) { + iscsit_rx_thread_wait_for_tcp(conn); + goto transport_err; + } + + /* + * Set conn->bad_hdr for use with REJECT PDUs. + */ + memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN); + + if (conn->conn_ops->HeaderDigest) { + iov.iov_base = &digest; + iov.iov_len = ISCSI_CRC_LEN; + + ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); + if (ret != ISCSI_CRC_LEN) { + iscsit_rx_thread_wait_for_tcp(conn); + goto transport_err; + } + + iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, + buffer, ISCSI_HDR_LEN, + 0, NULL, (u8 *)&checksum); + + if (digest != checksum) { + pr_err("HeaderDigest CRC32C failed," + " received 0x%08x, computed 0x%08x\n", + digest, checksum); + /* + * Set the PDU to 0xff so it will intentionally + * hit default in the switch below. + */ + memset(buffer, 0xff, ISCSI_HDR_LEN); + spin_lock_bh(&conn->sess->session_stats_lock); + conn->sess->conn_digest_errors++; + spin_unlock_bh(&conn->sess->session_stats_lock); + } else { + pr_debug("Got HeaderDigest CRC32C" + " 0x%08x\n", checksum); + } + } + + if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) + goto transport_err; + + opcode = buffer[0] & ISCSI_OPCODE_MASK; + + if (conn->sess->sess_ops->SessionType && + ((!(opcode & ISCSI_OP_TEXT)) || + (!(opcode & ISCSI_OP_LOGOUT)))) { + pr_err("Received illegal iSCSI Opcode: 0x%02x" + " while in Discovery Session, rejecting.\n", opcode); + iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, + buffer, conn); + goto transport_err; + } + + switch (opcode) { + case ISCSI_OP_SCSI_CMD: + if (iscsit_handle_scsi_cmd(conn, buffer) < 0) + goto transport_err; + break; + case ISCSI_OP_SCSI_DATA_OUT: + if (iscsit_handle_data_out(conn, buffer) < 0) + goto transport_err; + break; + case ISCSI_OP_NOOP_OUT: + if (iscsit_handle_nop_out(conn, buffer) < 0) + goto transport_err; + break; + case ISCSI_OP_SCSI_TMFUNC: + if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0) + goto transport_err; + break; + case ISCSI_OP_TEXT: + if (iscsit_handle_text_cmd(conn, buffer) < 0) + goto transport_err; + break; + case ISCSI_OP_LOGOUT: + ret = iscsit_handle_logout_cmd(conn, buffer); + if (ret > 0) { + wait_for_completion_timeout(&conn->conn_logout_comp, + SECONDS_FOR_LOGOUT_COMP * HZ); + goto transport_err; + } else if (ret < 0) + goto transport_err; + break; + case ISCSI_OP_SNACK: + if (iscsit_handle_snack(conn, buffer) < 0) + goto transport_err; + break; + default: + pr_err("Got unknown iSCSI OpCode: 0x%02x\n", + opcode); + if (!conn->sess->sess_ops->ErrorRecoveryLevel) { + pr_err("Cannot recover from unknown" + " opcode while ERL=0, closing iSCSI connection" + ".\n"); + goto transport_err; + } + if (!conn->conn_ops->OFMarker) { + pr_err("Unable to recover from unknown" + " opcode while OFMarker=No, closing iSCSI" + " connection.\n"); + goto transport_err; + } + if (iscsit_recover_from_unknown_opcode(conn) < 0) { + pr_err("Unable to recover from unknown" + " opcode, closing iSCSI connection.\n"); + goto transport_err; + } + break; + } + } + +transport_err: + if (!signal_pending(current)) + atomic_set(&conn->transport_failed, 1); + iscsit_take_action_for_connection_exit(conn); + goto restart; +out: + return 0; +} + +static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) +{ + struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; + struct iscsi_session *sess = conn->sess; + struct se_cmd *se_cmd; + /* + * We expect this function to only ever be called from either RX or TX + * thread context via iscsit_close_connection() once the other context + * has been reset -> returned sleeping pre-handler state. + */ + spin_lock_bh(&conn->cmd_lock); + list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) { + if (!(cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD)) { + + list_del(&cmd->i_list); + spin_unlock_bh(&conn->cmd_lock); + iscsit_increment_maxcmdsn(cmd, sess); + se_cmd = &cmd->se_cmd; + /* + * Special cases for active iSCSI TMR, and + * transport_lookup_cmd_lun() failing from + * iscsit_get_lun_for_cmd() in iscsit_handle_scsi_cmd(). + */ + if (cmd->tmr_req && se_cmd->transport_wait_for_tasks) + se_cmd->transport_wait_for_tasks(se_cmd, 1, 1); + else if (cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD) + transport_release_cmd(se_cmd); + else + iscsit_release_cmd(cmd); + + spin_lock_bh(&conn->cmd_lock); + continue; + } + list_del(&cmd->i_list); + spin_unlock_bh(&conn->cmd_lock); + + iscsit_increment_maxcmdsn(cmd, sess); + se_cmd = &cmd->se_cmd; + + if (se_cmd->transport_wait_for_tasks) + se_cmd->transport_wait_for_tasks(se_cmd, 1, 1); + + spin_lock_bh(&conn->cmd_lock); + } + spin_unlock_bh(&conn->cmd_lock); +} + +static void iscsit_stop_timers_for_cmds( + struct iscsi_conn *conn) +{ + struct iscsi_cmd *cmd; + + spin_lock_bh(&conn->cmd_lock); + list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) { + if (cmd->data_direction == DMA_TO_DEVICE) + iscsit_stop_dataout_timer(cmd); + } + spin_unlock_bh(&conn->cmd_lock); +} + +int iscsit_close_connection( + struct iscsi_conn *conn) +{ + int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); + struct iscsi_session *sess = conn->sess; + + pr_debug("Closing iSCSI connection CID %hu on SID:" + " %u\n", conn->cid, sess->sid); + /* + * Always up conn_logout_comp just in case the RX Thread is sleeping + * and the logout response never got sent because the connection + * failed. + */ + complete(&conn->conn_logout_comp); + + iscsi_release_thread_set(conn); + + iscsit_stop_timers_for_cmds(conn); + iscsit_stop_nopin_response_timer(conn); + iscsit_stop_nopin_timer(conn); + iscsit_free_queue_reqs_for_conn(conn); + + /* + * During Connection recovery drop unacknowledged out of order + * commands for this connection, and prepare the other commands + * for realligence. + * + * During normal operation clear the out of order commands (but + * do not free the struct iscsi_ooo_cmdsn's) and release all + * struct iscsi_cmds. + */ + if (atomic_read(&conn->connection_recovery)) { + iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); + iscsit_prepare_cmds_for_realligance(conn); + } else { + iscsit_clear_ooo_cmdsns_for_conn(conn); + iscsit_release_commands_from_conn(conn); + } + + /* + * Handle decrementing session or connection usage count if + * a logout response was not able to be sent because the + * connection failed. Fall back to Session Recovery here. + */ + if (atomic_read(&conn->conn_logout_remove)) { + if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { + iscsit_dec_conn_usage_count(conn); + iscsit_dec_session_usage_count(sess); + } + if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) + iscsit_dec_conn_usage_count(conn); + + atomic_set(&conn->conn_logout_remove, 0); + atomic_set(&sess->session_reinstatement, 0); + atomic_set(&sess->session_fall_back_to_erl0, 1); + } + + spin_lock_bh(&sess->conn_lock); + list_del(&conn->conn_list); + + /* + * Attempt to let the Initiator know this connection failed by + * sending an Connection Dropped Async Message on another + * active connection. + */ + if (atomic_read(&conn->connection_recovery)) + iscsit_build_conn_drop_async_message(conn); + + spin_unlock_bh(&sess->conn_lock); + + /* + * If connection reinstatement is being performed on this connection, + * up the connection reinstatement semaphore that is being blocked on + * in iscsit_cause_connection_reinstatement(). + */ + spin_lock_bh(&conn->state_lock); + if (atomic_read(&conn->sleep_on_conn_wait_comp)) { + spin_unlock_bh(&conn->state_lock); + complete(&conn->conn_wait_comp); + wait_for_completion(&conn->conn_post_wait_comp); + spin_lock_bh(&conn->state_lock); + } + + /* + * If connection reinstatement is being performed on this connection + * by receiving a REMOVECONNFORRECOVERY logout request, up the + * connection wait rcfr semaphore that is being blocked on + * an iscsit_connection_reinstatement_rcfr(). + */ + if (atomic_read(&conn->connection_wait_rcfr)) { + spin_unlock_bh(&conn->state_lock); + complete(&conn->conn_wait_rcfr_comp); + wait_for_completion(&conn->conn_post_wait_comp); + spin_lock_bh(&conn->state_lock); + } + atomic_set(&conn->connection_reinstatement, 1); + spin_unlock_bh(&conn->state_lock); + + /* + * If any other processes are accessing this connection pointer we + * must wait until they have completed. + */ + iscsit_check_conn_usage_count(conn); + + if (conn->conn_rx_hash.tfm) + crypto_free_hash(conn->conn_rx_hash.tfm); + if (conn->conn_tx_hash.tfm) + crypto_free_hash(conn->conn_tx_hash.tfm); + + if (conn->conn_cpumask) + free_cpumask_var(conn->conn_cpumask); + + kfree(conn->conn_ops); + conn->conn_ops = NULL; + + if (conn->sock) { + if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) { + kfree(conn->sock->file); + conn->sock->file = NULL; + } + sock_release(conn->sock); + } + conn->thread_set = NULL; + + pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); + conn->conn_state = TARG_CONN_STATE_FREE; + kfree(conn); + + spin_lock_bh(&sess->conn_lock); + atomic_dec(&sess->nconn); + pr_debug("Decremented iSCSI connection count to %hu from node:" + " %s\n", atomic_read(&sess->nconn), + sess->sess_ops->InitiatorName); + /* + * Make sure that if one connection fails in an non ERL=2 iSCSI + * Session that they all fail. + */ + if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && + !atomic_read(&sess->session_logout)) + atomic_set(&sess->session_fall_back_to_erl0, 1); + + /* + * If this was not the last connection in the session, and we are + * performing session reinstatement or falling back to ERL=0, call + * iscsit_stop_session() without sleeping to shutdown the other + * active connections. + */ + if (atomic_read(&sess->nconn)) { + if (!atomic_read(&sess->session_reinstatement) && + !atomic_read(&sess->session_fall_back_to_erl0)) { + spin_unlock_bh(&sess->conn_lock); + return 0; + } + if (!atomic_read(&sess->session_stop_active)) { + atomic_set(&sess->session_stop_active, 1); + spin_unlock_bh(&sess->conn_lock); + iscsit_stop_session(sess, 0, 0); + return 0; + } + spin_unlock_bh(&sess->conn_lock); + return 0; + } + + /* + * If this was the last connection in the session and one of the + * following is occurring: + * + * Session Reinstatement is not being performed, and are falling back + * to ERL=0 call iscsit_close_session(). + * + * Session Logout was requested. iscsit_close_session() will be called + * elsewhere. + * + * Session Continuation is not being performed, start the Time2Retain + * handler and check if sleep_on_sess_wait_sem is active. + */ + if (!atomic_read(&sess->session_reinstatement) && + atomic_read(&sess->session_fall_back_to_erl0)) { + spin_unlock_bh(&sess->conn_lock); + iscsit_close_session(sess); + + return 0; + } else if (atomic_read(&sess->session_logout)) { + pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); + sess->session_state = TARG_SESS_STATE_FREE; + spin_unlock_bh(&sess->conn_lock); + + if (atomic_read(&sess->sleep_on_sess_wait_comp)) + complete(&sess->session_wait_comp); + + return 0; + } else { + pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); + sess->session_state = TARG_SESS_STATE_FAILED; + + if (!atomic_read(&sess->session_continuation)) { + spin_unlock_bh(&sess->conn_lock); + iscsit_start_time2retain_handler(sess); + } else + spin_unlock_bh(&sess->conn_lock); + + if (atomic_read(&sess->sleep_on_sess_wait_comp)) + complete(&sess->session_wait_comp); + + return 0; + } + spin_unlock_bh(&sess->conn_lock); + + return 0; +} + +int iscsit_close_session(struct iscsi_session *sess) +{ + struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess); + struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; + + if (atomic_read(&sess->nconn)) { + pr_err("%d connection(s) still exist for iSCSI session" + " to %s\n", atomic_read(&sess->nconn), + sess->sess_ops->InitiatorName); + BUG(); + } + + spin_lock_bh(&se_tpg->session_lock); + atomic_set(&sess->session_logout, 1); + atomic_set(&sess->session_reinstatement, 1); + iscsit_stop_time2retain_timer(sess); + spin_unlock_bh(&se_tpg->session_lock); + + /* + * transport_deregister_session_configfs() will clear the + * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context + * can be setting it again with __transport_register_session() in + * iscsi_post_login_handler() again after the iscsit_stop_session() + * completes in iscsi_np context. + */ + transport_deregister_session_configfs(sess->se_sess); + + /* + * If any other processes are accessing this session pointer we must + * wait until they have completed. If we are in an interrupt (the + * time2retain handler) and contain and active session usage count we + * restart the timer and exit. + */ + if (!in_interrupt()) { + if (iscsit_check_session_usage_count(sess) == 1) + iscsit_stop_session(sess, 1, 1); + } else { + if (iscsit_check_session_usage_count(sess) == 2) { + atomic_set(&sess->session_logout, 0); + iscsit_start_time2retain_handler(sess); + return 0; + } + } + + transport_deregister_session(sess->se_sess); + + if (sess->sess_ops->ErrorRecoveryLevel == 2) + iscsit_free_connection_recovery_entires(sess); + + iscsit_free_all_ooo_cmdsns(sess); + + spin_lock_bh(&se_tpg->session_lock); + pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); + sess->session_state = TARG_SESS_STATE_FREE; + pr_debug("Released iSCSI session from node: %s\n", + sess->sess_ops->InitiatorName); + tpg->nsessions--; + if (tpg->tpg_tiqn) + tpg->tpg_tiqn->tiqn_nsessions--; + + pr_debug("Decremented number of active iSCSI Sessions on" + " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); + + spin_lock(&sess_idr_lock); + idr_remove(&sess_idr, sess->session_index); + spin_unlock(&sess_idr_lock); + + kfree(sess->sess_ops); + sess->sess_ops = NULL; + spin_unlock_bh(&se_tpg->session_lock); + + kfree(sess); + return 0; +} + +static void iscsit_logout_post_handler_closesession( + struct iscsi_conn *conn) +{ + struct iscsi_session *sess = conn->sess; + + iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD); + iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD); + + atomic_set(&conn->conn_logout_remove, 0); + complete(&conn->conn_logout_comp); + + iscsit_dec_conn_usage_count(conn); + iscsit_stop_session(sess, 1, 1); + iscsit_dec_session_usage_count(sess); + iscsit_close_session(sess); +} + +static void iscsit_logout_post_handler_samecid( + struct iscsi_conn *conn) +{ + iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD); + iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD); + + atomic_set(&conn->conn_logout_remove, 0); + complete(&conn->conn_logout_comp); + + iscsit_cause_connection_reinstatement(conn, 1); + iscsit_dec_conn_usage_count(conn); +} + +static void iscsit_logout_post_handler_diffcid( + struct iscsi_conn *conn, + u16 cid) +{ + struct iscsi_conn *l_conn; + struct iscsi_session *sess = conn->sess; + + if (!sess) + return; + + spin_lock_bh(&sess->conn_lock); + list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { + if (l_conn->cid == cid) { + iscsit_inc_conn_usage_count(l_conn); + break; + } + } + spin_unlock_bh(&sess->conn_lock); + + if (!l_conn) + return; + + if (l_conn->sock) + l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); + + spin_lock_bh(&l_conn->state_lock); + pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); + l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; + spin_unlock_bh(&l_conn->state_lock); + + iscsit_cause_connection_reinstatement(l_conn, 1); + iscsit_dec_conn_usage_count(l_conn); +} + +/* + * Return of 0 causes the TX thread to restart. + */ +static int iscsit_logout_post_handler( + struct iscsi_cmd *cmd, + struct iscsi_conn *conn) +{ + int ret = 0; + + switch (cmd->logout_reason) { + case ISCSI_LOGOUT_REASON_CLOSE_SESSION: + switch (cmd->logout_response) { + case ISCSI_LOGOUT_SUCCESS: + case ISCSI_LOGOUT_CLEANUP_FAILED: + default: + iscsit_logout_post_handler_closesession(conn); + break; + } + ret = 0; + break; + case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: + if (conn->cid == cmd->logout_cid) { + switch (cmd->logout_response) { + case ISCSI_LOGOUT_SUCCESS: + case ISCSI_LOGOUT_CLEANUP_FAILED: + default: + iscsit_logout_post_handler_samecid(conn); + break; + } + ret = 0; + } else { + switch (cmd->logout_response) { + case ISCSI_LOGOUT_SUCCESS: + iscsit_logout_post_handler_diffcid(conn, + cmd->logout_cid); + break; + case ISCSI_LOGOUT_CID_NOT_FOUND: + case ISCSI_LOGOUT_CLEANUP_FAILED: + default: + break; + } + ret = 1; + } + break; + case ISCSI_LOGOUT_REASON_RECOVERY: + switch (cmd->logout_response) { + case ISCSI_LOGOUT_SUCCESS: + case ISCSI_LOGOUT_CID_NOT_FOUND: + case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: + case ISCSI_LOGOUT_CLEANUP_FAILED: + default: + break; + } + ret = 1; + break; + default: + break; + + } + return ret; +} + +void iscsit_fail_session(struct iscsi_session *sess) +{ + struct iscsi_conn *conn; + + spin_lock_bh(&sess->conn_lock); + list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { + pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); + conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; + } + spin_unlock_bh(&sess->conn_lock); + + pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); + sess->session_state = TARG_SESS_STATE_FAILED; +} + +int iscsit_free_session(struct iscsi_session *sess) +{ + u16 conn_count = atomic_read(&sess->nconn); + struct iscsi_conn *conn, *conn_tmp = NULL; + int is_last; + + spin_lock_bh(&sess->conn_lock); + atomic_set(&sess->sleep_on_sess_wait_comp, 1); + + list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, + conn_list) { + if (conn_count == 0) + break; + + if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { + is_last = 1; + } else { + iscsit_inc_conn_usage_count(conn_tmp); + is_last = 0; + } + iscsit_inc_conn_usage_count(conn); + + spin_unlock_bh(&sess->conn_lock); + iscsit_cause_connection_reinstatement(conn, 1); + spin_lock_bh(&sess->conn_lock); + + iscsit_dec_conn_usage_count(conn); + if (is_last == 0) + iscsit_dec_conn_usage_count(conn_tmp); + + conn_count--; + } + + if (atomic_read(&sess->nconn)) { + spin_unlock_bh(&sess->conn_lock); + wait_for_completion(&sess->session_wait_comp); + } else + spin_unlock_bh(&sess->conn_lock); + + iscsit_close_session(sess); + return 0; +} + +void iscsit_stop_session( + struct iscsi_session *sess, + int session_sleep, + int connection_sleep) +{ + u16 conn_count = atomic_read(&sess->nconn); + struct iscsi_conn *conn, *conn_tmp = NULL; + int is_last; + + spin_lock_bh(&sess->conn_lock); + if (session_sleep) + atomic_set(&sess->sleep_on_sess_wait_comp, 1); + + if (connection_sleep) { + list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, + conn_list) { + if (conn_count == 0) + break; + + if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { + is_last = 1; + } else { + iscsit_inc_conn_usage_count(conn_tmp); + is_last = 0; + } + iscsit_inc_conn_usage_count(conn); + + spin_unlock_bh(&sess->conn_lock); + iscsit_cause_connection_reinstatement(conn, 1); + spin_lock_bh(&sess->conn_lock); + + iscsit_dec_conn_usage_count(conn); + if (is_last == 0) + iscsit_dec_conn_usage_count(conn_tmp); + conn_count--; + } + } else { + list_for_each_entry(conn, &sess->sess_conn_list, conn_list) + iscsit_cause_connection_reinstatement(conn, 0); + } + + if (session_sleep && atomic_read(&sess->nconn)) { + spin_unlock_bh(&sess->conn_lock); + wait_for_completion(&sess->session_wait_comp); + } else + spin_unlock_bh(&sess->conn_lock); +} + +int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) +{ + struct iscsi_session *sess; + struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; + struct se_session *se_sess, *se_sess_tmp; + int session_count = 0; + + spin_lock_bh(&se_tpg->session_lock); + if (tpg->nsessions && !force) { + spin_unlock_bh(&se_tpg->session_lock); + return -1; + } + + list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, + sess_list) { + sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; + + spin_lock(&sess->conn_lock); + if (atomic_read(&sess->session_fall_back_to_erl0) || + atomic_read(&sess->session_logout) || + (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { + spin_unlock(&sess->conn_lock); + continue; + } + atomic_set(&sess->session_reinstatement, 1); + spin_unlock(&sess->conn_lock); + spin_unlock_bh(&se_tpg->session_lock); + + iscsit_free_session(sess); + spin_lock_bh(&se_tpg->session_lock); + + session_count++; + } + spin_unlock_bh(&se_tpg->session_lock); + + pr_debug("Released %d iSCSI Session(s) from Target Portal" + " Group: %hu\n", session_count, tpg->tpgt); + return 0; +} + +MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); +MODULE_VERSION("4.1.x"); +MODULE_AUTHOR("nab@Linux-iSCSI.org"); +MODULE_LICENSE("GPL"); + +module_init(iscsi_target_init_module); +module_exit(iscsi_target_cleanup_module); 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