| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Varun Prakash | 10019 | 47.32% | 11 | 7.64% |
| Nicholas Bellinger | 9394 | 44.36% | 53 | 36.81% |
| Bart Van Assche | 540 | 2.55% | 21 | 14.58% |
| Andy Grover | 536 | 2.53% | 13 | 9.03% |
| Maurizio Lombardi | 107 | 0.51% | 2 | 1.39% |
| Sagi Grimberg | 102 | 0.48% | 4 | 2.78% |
| Jiang Yi | 71 | 0.34% | 1 | 0.69% |
| Sudhakar Panneerselvam | 64 | 0.30% | 3 | 2.08% |
| Roland Dreier | 51 | 0.24% | 3 | 2.08% |
| Christoph Hellwig | 45 | 0.21% | 7 | 4.86% |
| Herbert Xu | 40 | 0.19% | 1 | 0.69% |
| Laura Abbott | 36 | 0.17% | 1 | 0.69% |
| Thomas Glanzmann | 31 | 0.15% | 1 | 0.69% |
| Arshad Hussain | 27 | 0.13% | 1 | 0.69% |
| Imran Haider | 25 | 0.12% | 1 | 0.69% |
| Tejun Heo | 24 | 0.11% | 1 | 0.69% |
| SF Markus Elfring | 15 | 0.07% | 2 | 1.39% |
| David Disseldorp | 11 | 0.05% | 2 | 1.39% |
| Matthew Wilcox | 7 | 0.03% | 1 | 0.69% |
| Christophe Vu-Brugier | 5 | 0.02% | 2 | 1.39% |
| Paul Gortmaker | 3 | 0.01% | 1 | 0.69% |
| Colin Ian King | 3 | 0.01% | 2 | 1.39% |
| Ingo Molnar | 3 | 0.01% | 1 | 0.69% |
| Al Viro | 3 | 0.01% | 1 | 0.69% |
| David S. Miller | 3 | 0.01% | 1 | 0.69% |
| Kees Cook | 2 | 0.01% | 1 | 0.69% |
| Thomas Gleixner | 2 | 0.01% | 1 | 0.69% |
| Alexei Potashnik | 2 | 0.01% | 1 | 0.69% |
| Leo Zhang | 1 | 0.00% | 1 | 0.69% |
| Geert Uytterhoeven | 1 | 0.00% | 1 | 0.69% |
| Dan Carpenter | 1 | 0.00% | 1 | 0.69% |
| Michael Christie | 1 | 0.00% | 1 | 0.69% |
| Total | 21175 | 144 |
// SPDX-License-Identifier: GPL-2.0-or-later /******************************************************************************* * This file contains main functions related to the iSCSI Target Core Driver. * * (c) Copyright 2007-2013 Datera, Inc. * * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> * ******************************************************************************/ #include <crypto/hash.h> #include <linux/string.h> #include <linux/kthread.h> #include <linux/completion.h> #include <linux/module.h> #include <linux/vmalloc.h> #include <linux/idr.h> #include <linux/delay.h> #include <linux/sched/signal.h> #include <asm/unaligned.h> #include <linux/inet.h> #include <net/ipv6.h> #include <scsi/scsi_proto.h> #include <scsi/iscsi_proto.h> #include <scsi/scsi_tcq.h> #include <target/target_core_base.h> #include <target/target_core_fabric.h> #include <target/iscsi/iscsi_target_core.h> #include "iscsi_target_parameters.h" #include "iscsi_target_seq_pdu_list.h" #include "iscsi_target_datain_values.h" #include "iscsi_target_erl0.h" #include "iscsi_target_erl1.h" #include "iscsi_target_erl2.h" #include "iscsi_target_login.h" #include "iscsi_target_tmr.h" #include "iscsi_target_tpg.h" #include "iscsi_target_util.h" #include "iscsi_target.h" #include "iscsi_target_device.h" #include <target/iscsi/iscsi_target_stat.h> #include <target/iscsi/iscsi_transport.h> static LIST_HEAD(g_tiqn_list); static LIST_HEAD(g_np_list); static DEFINE_SPINLOCK(tiqn_lock); static DEFINE_MUTEX(np_lock); static struct idr tiqn_idr; DEFINE_IDA(sess_ida); struct mutex auth_id_lock; struct iscsit_global *iscsit_global; struct kmem_cache *lio_qr_cache; struct kmem_cache *lio_dr_cache; struct kmem_cache *lio_ooo_cache; struct kmem_cache *lio_r2t_cache; static int iscsit_handle_immediate_data(struct iscsi_cmd *, struct iscsi_scsi_req *, u32); struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf) { struct iscsi_tiqn *tiqn = NULL; spin_lock(&tiqn_lock); list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { if (!strcmp(tiqn->tiqn, buf)) { spin_lock(&tiqn->tiqn_state_lock); if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { tiqn->tiqn_access_count++; spin_unlock(&tiqn->tiqn_state_lock); spin_unlock(&tiqn_lock); return tiqn; } spin_unlock(&tiqn->tiqn_state_lock); } } spin_unlock(&tiqn_lock); return NULL; } static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn) { spin_lock(&tiqn->tiqn_state_lock); if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { tiqn->tiqn_state = TIQN_STATE_SHUTDOWN; spin_unlock(&tiqn->tiqn_state_lock); return 0; } spin_unlock(&tiqn->tiqn_state_lock); return -1; } void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn) { spin_lock(&tiqn->tiqn_state_lock); tiqn->tiqn_access_count--; spin_unlock(&tiqn->tiqn_state_lock); } /* * Note that IQN formatting is expected to be done in userspace, and * no explict IQN format checks are done here. */ struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf) { struct iscsi_tiqn *tiqn = NULL; int ret; if (strlen(buf) >= ISCSI_IQN_LEN) { pr_err("Target IQN exceeds %d bytes\n", ISCSI_IQN_LEN); return ERR_PTR(-EINVAL); } tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL); if (!tiqn) return ERR_PTR(-ENOMEM); sprintf(tiqn->tiqn, "%s", buf); INIT_LIST_HEAD(&tiqn->tiqn_list); INIT_LIST_HEAD(&tiqn->tiqn_tpg_list); spin_lock_init(&tiqn->tiqn_state_lock); spin_lock_init(&tiqn->tiqn_tpg_lock); spin_lock_init(&tiqn->sess_err_stats.lock); spin_lock_init(&tiqn->login_stats.lock); spin_lock_init(&tiqn->logout_stats.lock); tiqn->tiqn_state = TIQN_STATE_ACTIVE; idr_preload(GFP_KERNEL); spin_lock(&tiqn_lock); ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT); if (ret < 0) { pr_err("idr_alloc() failed for tiqn->tiqn_index\n"); spin_unlock(&tiqn_lock); idr_preload_end(); kfree(tiqn); return ERR_PTR(ret); } tiqn->tiqn_index = ret; list_add_tail(&tiqn->tiqn_list, &g_tiqn_list); spin_unlock(&tiqn_lock); idr_preload_end(); pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn); return tiqn; } static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn) { /* * Wait for accesses to said struct iscsi_tiqn to end. */ spin_lock(&tiqn->tiqn_state_lock); while (tiqn->tiqn_access_count != 0) { spin_unlock(&tiqn->tiqn_state_lock); msleep(10); spin_lock(&tiqn->tiqn_state_lock); } spin_unlock(&tiqn->tiqn_state_lock); } void iscsit_del_tiqn(struct iscsi_tiqn *tiqn) { /* * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN * while holding tiqn->tiqn_state_lock. This means that all subsequent * attempts to access this struct iscsi_tiqn will fail from both transport * fabric and control code paths. */ if (iscsit_set_tiqn_shutdown(tiqn) < 0) { pr_err("iscsit_set_tiqn_shutdown() failed\n"); return; } iscsit_wait_for_tiqn(tiqn); spin_lock(&tiqn_lock); list_del(&tiqn->tiqn_list); idr_remove(&tiqn_idr, tiqn->tiqn_index); spin_unlock(&tiqn_lock); pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n", tiqn->tiqn); kfree(tiqn); } int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) { int ret; /* * Determine if the network portal is accepting storage traffic. */ spin_lock_bh(&np->np_thread_lock); if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { spin_unlock_bh(&np->np_thread_lock); return -1; } spin_unlock_bh(&np->np_thread_lock); /* * Determine if the portal group is accepting storage traffic. */ spin_lock_bh(&tpg->tpg_state_lock); if (tpg->tpg_state != TPG_STATE_ACTIVE) { spin_unlock_bh(&tpg->tpg_state_lock); return -1; } spin_unlock_bh(&tpg->tpg_state_lock); /* * Here we serialize access across the TIQN+TPG Tuple. */ ret = down_interruptible(&tpg->np_login_sem); if (ret != 0) return -1; spin_lock_bh(&tpg->tpg_state_lock); if (tpg->tpg_state != TPG_STATE_ACTIVE) { spin_unlock_bh(&tpg->tpg_state_lock); up(&tpg->np_login_sem); return -1; } spin_unlock_bh(&tpg->tpg_state_lock); return 0; } void iscsit_login_kref_put(struct kref *kref) { struct iscsi_tpg_np *tpg_np = container_of(kref, struct iscsi_tpg_np, tpg_np_kref); complete(&tpg_np->tpg_np_comp); } int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg, struct iscsi_tpg_np *tpg_np) { struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; up(&tpg->np_login_sem); if (tpg_np) kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); if (tiqn) iscsit_put_tiqn_for_login(tiqn); return 0; } bool iscsit_check_np_match( struct sockaddr_storage *sockaddr, struct iscsi_np *np, int network_transport) { struct sockaddr_in *sock_in, *sock_in_e; struct sockaddr_in6 *sock_in6, *sock_in6_e; bool ip_match = false; u16 port, port_e; if (sockaddr->ss_family == AF_INET6) { sock_in6 = (struct sockaddr_in6 *)sockaddr; sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr; if (!memcmp(&sock_in6->sin6_addr.in6_u, &sock_in6_e->sin6_addr.in6_u, sizeof(struct in6_addr))) ip_match = true; port = ntohs(sock_in6->sin6_port); port_e = ntohs(sock_in6_e->sin6_port); } else { sock_in = (struct sockaddr_in *)sockaddr; sock_in_e = (struct sockaddr_in *)&np->np_sockaddr; if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr) ip_match = true; port = ntohs(sock_in->sin_port); port_e = ntohs(sock_in_e->sin_port); } if (ip_match && (port_e == port) && (np->np_network_transport == network_transport)) return true; return false; } static struct iscsi_np *iscsit_get_np( struct sockaddr_storage *sockaddr, int network_transport) { struct iscsi_np *np; bool match; lockdep_assert_held(&np_lock); list_for_each_entry(np, &g_np_list, np_list) { spin_lock_bh(&np->np_thread_lock); if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { spin_unlock_bh(&np->np_thread_lock); continue; } match = iscsit_check_np_match(sockaddr, np, network_transport); if (match) { /* * Increment the np_exports reference count now to * prevent iscsit_del_np() below from being called * while iscsi_tpg_add_network_portal() is called. */ np->np_exports++; spin_unlock_bh(&np->np_thread_lock); return np; } spin_unlock_bh(&np->np_thread_lock); } return NULL; } struct iscsi_np *iscsit_add_np( struct sockaddr_storage *sockaddr, int network_transport) { struct iscsi_np *np; int ret; mutex_lock(&np_lock); /* * Locate the existing struct iscsi_np if already active.. */ np = iscsit_get_np(sockaddr, network_transport); if (np) { mutex_unlock(&np_lock); return np; } np = kzalloc(sizeof(*np), GFP_KERNEL); if (!np) { mutex_unlock(&np_lock); return ERR_PTR(-ENOMEM); } np->np_flags |= NPF_IP_NETWORK; np->np_network_transport = network_transport; spin_lock_init(&np->np_thread_lock); init_completion(&np->np_restart_comp); INIT_LIST_HEAD(&np->np_list); timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0); ret = iscsi_target_setup_login_socket(np, sockaddr); if (ret != 0) { kfree(np); mutex_unlock(&np_lock); return ERR_PTR(ret); } np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np"); if (IS_ERR(np->np_thread)) { pr_err("Unable to create kthread: iscsi_np\n"); ret = PTR_ERR(np->np_thread); kfree(np); mutex_unlock(&np_lock); return ERR_PTR(ret); } /* * Increment the np_exports reference count now to prevent * iscsit_del_np() below from being run while a new call to * iscsi_tpg_add_network_portal() for a matching iscsi_np is * active. We don't need to hold np->np_thread_lock at this * point because iscsi_np has not been added to g_np_list yet. */ np->np_exports = 1; np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; list_add_tail(&np->np_list, &g_np_list); mutex_unlock(&np_lock); pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n", &np->np_sockaddr, np->np_transport->name); return np; } int iscsit_reset_np_thread( struct iscsi_np *np, struct iscsi_tpg_np *tpg_np, struct iscsi_portal_group *tpg, bool shutdown) { spin_lock_bh(&np->np_thread_lock); if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) { spin_unlock_bh(&np->np_thread_lock); return 0; } np->np_thread_state = ISCSI_NP_THREAD_RESET; atomic_inc(&np->np_reset_count); if (np->np_thread) { spin_unlock_bh(&np->np_thread_lock); send_sig(SIGINT, np->np_thread, 1); wait_for_completion(&np->np_restart_comp); spin_lock_bh(&np->np_thread_lock); } spin_unlock_bh(&np->np_thread_lock); if (tpg_np && shutdown) { kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); wait_for_completion(&tpg_np->tpg_np_comp); } return 0; } static void iscsit_free_np(struct iscsi_np *np) { if (np->np_socket) sock_release(np->np_socket); } int iscsit_del_np(struct iscsi_np *np) { spin_lock_bh(&np->np_thread_lock); np->np_exports--; if (np->np_exports) { np->enabled = true; spin_unlock_bh(&np->np_thread_lock); return 0; } np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN; spin_unlock_bh(&np->np_thread_lock); if (np->np_thread) { /* * We need to send the signal to wakeup Linux/Net * which may be sleeping in sock_accept().. */ send_sig(SIGINT, np->np_thread, 1); kthread_stop(np->np_thread); np->np_thread = NULL; } np->np_transport->iscsit_free_np(np); mutex_lock(&np_lock); list_del(&np->np_list); mutex_unlock(&np_lock); pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n", &np->np_sockaddr, np->np_transport->name); iscsit_put_transport(np->np_transport); kfree(np); return 0; } static void iscsit_get_rx_pdu(struct iscsi_conn *); int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd) { return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); } EXPORT_SYMBOL(iscsit_queue_rsp); void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd) { spin_lock_bh(&conn->cmd_lock); if (!list_empty(&cmd->i_conn_node) && !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP)) list_del_init(&cmd->i_conn_node); spin_unlock_bh(&conn->cmd_lock); __iscsit_free_cmd(cmd, true); } EXPORT_SYMBOL(iscsit_aborted_task); static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *, u32, u32, const void *, void *); static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *); static int iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, const void *data_buf, u32 data_buf_len) { struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu; struct kvec *iov; u32 niov = 0, tx_size = ISCSI_HDR_LEN; int ret; iov = &cmd->iov_misc[0]; iov[niov].iov_base = cmd->pdu; iov[niov++].iov_len = ISCSI_HDR_LEN; if (conn->conn_ops->HeaderDigest) { u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr, ISCSI_HDR_LEN, 0, NULL, header_digest); iov[0].iov_len += ISCSI_CRC_LEN; tx_size += ISCSI_CRC_LEN; pr_debug("Attaching CRC32C HeaderDigest" " to opcode 0x%x 0x%08x\n", hdr->opcode, *header_digest); } if (data_buf_len) { u32 padding = ((-data_buf_len) & 3); iov[niov].iov_base = (void *)data_buf; iov[niov++].iov_len = data_buf_len; tx_size += data_buf_len; if (padding != 0) { iov[niov].iov_base = &cmd->pad_bytes; iov[niov++].iov_len = padding; tx_size += padding; pr_debug("Attaching %u additional" " padding bytes.\n", padding); } if (conn->conn_ops->DataDigest) { iscsit_do_crypto_hash_buf(conn->conn_tx_hash, data_buf, data_buf_len, padding, &cmd->pad_bytes, &cmd->data_crc); iov[niov].iov_base = &cmd->data_crc; iov[niov++].iov_len = ISCSI_CRC_LEN; tx_size += ISCSI_CRC_LEN; pr_debug("Attached DataDigest for %u" " bytes opcode 0x%x, CRC 0x%08x\n", data_buf_len, hdr->opcode, cmd->data_crc); } } cmd->iov_misc_count = niov; cmd->tx_size = tx_size; ret = iscsit_send_tx_data(cmd, conn, 1); if (ret < 0) { iscsit_tx_thread_wait_for_tcp(conn); return ret; } return 0; } static int iscsit_map_iovec(struct iscsi_cmd *cmd, struct kvec *iov, int nvec, u32 data_offset, u32 data_length); static void iscsit_unmap_iovec(struct iscsi_cmd *); static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *, u32, u32, u32, u8 *); static int iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, const struct iscsi_datain *datain) { struct kvec *iov; u32 iov_count = 0, tx_size = 0; int ret, iov_ret; iov = &cmd->iov_data[0]; iov[iov_count].iov_base = cmd->pdu; iov[iov_count++].iov_len = ISCSI_HDR_LEN; tx_size += ISCSI_HDR_LEN; if (conn->conn_ops->HeaderDigest) { u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu, ISCSI_HDR_LEN, 0, NULL, header_digest); iov[0].iov_len += ISCSI_CRC_LEN; tx_size += ISCSI_CRC_LEN; pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n", *header_digest); } iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[iov_count], cmd->orig_iov_data_count - (iov_count + 2), datain->offset, datain->length); if (iov_ret < 0) return -1; iov_count += iov_ret; tx_size += datain->length; cmd->padding = ((-datain->length) & 3); if (cmd->padding) { iov[iov_count].iov_base = cmd->pad_bytes; iov[iov_count++].iov_len = cmd->padding; tx_size += cmd->padding; pr_debug("Attaching %u padding bytes\n", cmd->padding); } if (conn->conn_ops->DataDigest) { cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash, cmd, datain->offset, datain->length, cmd->padding, cmd->pad_bytes); iov[iov_count].iov_base = &cmd->data_crc; iov[iov_count++].iov_len = ISCSI_CRC_LEN; tx_size += ISCSI_CRC_LEN; pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n", datain->length + cmd->padding, cmd->data_crc); } cmd->iov_data_count = iov_count; cmd->tx_size = tx_size; ret = iscsit_fe_sendpage_sg(cmd, conn); iscsit_unmap_iovec(cmd); if (ret < 0) { iscsit_tx_thread_wait_for_tcp(conn); return ret; } return 0; } static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, struct iscsi_datain_req *dr, const void *buf, u32 buf_len) { if (dr) return iscsit_xmit_datain_pdu(conn, cmd, buf); else return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len); } static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn) { return TARGET_PROT_NORMAL; } static struct iscsit_transport iscsi_target_transport = { .name = "iSCSI/TCP", .transport_type = ISCSI_TCP, .rdma_shutdown = false, .owner = NULL, .iscsit_setup_np = iscsit_setup_np, .iscsit_accept_np = iscsit_accept_np, .iscsit_free_np = iscsit_free_np, .iscsit_get_login_rx = iscsit_get_login_rx, .iscsit_put_login_tx = iscsit_put_login_tx, .iscsit_get_dataout = iscsit_build_r2ts_for_cmd, .iscsit_immediate_queue = iscsit_immediate_queue, .iscsit_response_queue = iscsit_response_queue, .iscsit_queue_data_in = iscsit_queue_rsp, .iscsit_queue_status = iscsit_queue_rsp, .iscsit_aborted_task = iscsit_aborted_task, .iscsit_xmit_pdu = iscsit_xmit_pdu, .iscsit_get_rx_pdu = iscsit_get_rx_pdu, .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops, }; static int __init iscsi_target_init_module(void) { int ret = 0, size; pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL); if (!iscsit_global) return -1; spin_lock_init(&iscsit_global->ts_bitmap_lock); mutex_init(&auth_id_lock); idr_init(&tiqn_idr); ret = target_register_template(&iscsi_ops); if (ret) goto out; size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long); iscsit_global->ts_bitmap = vzalloc(size); if (!iscsit_global->ts_bitmap) goto configfs_out; lio_qr_cache = kmem_cache_create("lio_qr_cache", sizeof(struct iscsi_queue_req), __alignof__(struct iscsi_queue_req), 0, NULL); if (!lio_qr_cache) { pr_err("Unable to kmem_cache_create() for" " lio_qr_cache\n"); goto bitmap_out; } lio_dr_cache = kmem_cache_create("lio_dr_cache", sizeof(struct iscsi_datain_req), __alignof__(struct iscsi_datain_req), 0, NULL); if (!lio_dr_cache) { pr_err("Unable to kmem_cache_create() for" " lio_dr_cache\n"); goto qr_out; } lio_ooo_cache = kmem_cache_create("lio_ooo_cache", sizeof(struct iscsi_ooo_cmdsn), __alignof__(struct iscsi_ooo_cmdsn), 0, NULL); if (!lio_ooo_cache) { pr_err("Unable to kmem_cache_create() for" " lio_ooo_cache\n"); goto dr_out; } lio_r2t_cache = kmem_cache_create("lio_r2t_cache", sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t), 0, NULL); if (!lio_r2t_cache) { pr_err("Unable to kmem_cache_create() for" " lio_r2t_cache\n"); goto ooo_out; } iscsit_register_transport(&iscsi_target_transport); if (iscsit_load_discovery_tpg() < 0) goto r2t_out; return ret; r2t_out: iscsit_unregister_transport(&iscsi_target_transport); kmem_cache_destroy(lio_r2t_cache); ooo_out: kmem_cache_destroy(lio_ooo_cache); dr_out: kmem_cache_destroy(lio_dr_cache); qr_out: kmem_cache_destroy(lio_qr_cache); bitmap_out: vfree(iscsit_global->ts_bitmap); configfs_out: /* XXX: this probably wants it to be it's own unwind step.. */ if (iscsit_global->discovery_tpg) iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); target_unregister_template(&iscsi_ops); out: kfree(iscsit_global); return -ENOMEM; } static void __exit iscsi_target_cleanup_module(void) { iscsit_release_discovery_tpg(); iscsit_unregister_transport(&iscsi_target_transport); kmem_cache_destroy(lio_qr_cache); kmem_cache_destroy(lio_dr_cache); kmem_cache_destroy(lio_ooo_cache); kmem_cache_destroy(lio_r2t_cache); /* * Shutdown discovery sessions and disable discovery TPG */ if (iscsit_global->discovery_tpg) iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); target_unregister_template(&iscsi_ops); vfree(iscsit_global->ts_bitmap); kfree(iscsit_global); } int iscsit_add_reject( struct iscsi_conn *conn, u8 reason, unsigned char *buf) { struct iscsi_cmd *cmd; cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); if (!cmd) return -1; cmd->iscsi_opcode = ISCSI_OP_REJECT; cmd->reject_reason = reason; cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); if (!cmd->buf_ptr) { pr_err("Unable to allocate memory for cmd->buf_ptr\n"); iscsit_free_cmd(cmd, false); return -1; } spin_lock_bh(&conn->cmd_lock); list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); spin_unlock_bh(&conn->cmd_lock); cmd->i_state = ISTATE_SEND_REJECT; iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); return -1; } EXPORT_SYMBOL(iscsit_add_reject); static int iscsit_add_reject_from_cmd( struct iscsi_cmd *cmd, u8 reason, bool add_to_conn, unsigned char *buf) { struct iscsi_conn *conn; const bool do_put = cmd->se_cmd.se_tfo != NULL; if (!cmd->conn) { pr_err("cmd->conn is NULL for ITT: 0x%08x\n", cmd->init_task_tag); return -1; } conn = cmd->conn; cmd->iscsi_opcode = ISCSI_OP_REJECT; cmd->reject_reason = reason; cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); if (!cmd->buf_ptr) { pr_err("Unable to allocate memory for cmd->buf_ptr\n"); iscsit_free_cmd(cmd, false); return -1; } if (add_to_conn) { spin_lock_bh(&conn->cmd_lock); list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); spin_unlock_bh(&conn->cmd_lock); } cmd->i_state = ISTATE_SEND_REJECT; iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); /* * Perform the kref_put now if se_cmd has already been setup by * scsit_setup_scsi_cmd() */ if (do_put) { pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n"); target_put_sess_cmd(&cmd->se_cmd); } return -1; } static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf) { return iscsit_add_reject_from_cmd(cmd, reason, true, buf); } int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf) { return iscsit_add_reject_from_cmd(cmd, reason, false, buf); } EXPORT_SYMBOL(iscsit_reject_cmd); /* * Map some portion of the allocated scatterlist to an iovec, suitable for * kernel sockets to copy data in/out. */ static int iscsit_map_iovec(struct iscsi_cmd *cmd, struct kvec *iov, int nvec, u32 data_offset, u32 data_length) { u32 i = 0, orig_data_length = data_length; struct scatterlist *sg; unsigned int page_off; /* * We know each entry in t_data_sg contains a page. */ u32 ent = data_offset / PAGE_SIZE; if (!data_length) return 0; if (ent >= cmd->se_cmd.t_data_nents) { pr_err("Initial page entry out-of-bounds\n"); goto overflow; } sg = &cmd->se_cmd.t_data_sg[ent]; page_off = (data_offset % PAGE_SIZE); cmd->first_data_sg = sg; cmd->first_data_sg_off = page_off; while (data_length) { u32 cur_len; if (WARN_ON_ONCE(!sg || i >= nvec)) goto overflow; cur_len = min_t(u32, data_length, sg->length - page_off); iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off; iov[i].iov_len = cur_len; data_length -= cur_len; page_off = 0; sg = sg_next(sg); i++; } cmd->kmapped_nents = i; return i; overflow: pr_err("offset %d + length %d overflow; %d/%d; sg-list:\n", data_offset, orig_data_length, i, nvec); for_each_sg(cmd->se_cmd.t_data_sg, sg, cmd->se_cmd.t_data_nents, i) { pr_err("[%d] off %d len %d\n", i, sg->offset, sg->length); } return -1; } static void iscsit_unmap_iovec(struct iscsi_cmd *cmd) { u32 i; struct scatterlist *sg; sg = cmd->first_data_sg; for (i = 0; i < cmd->kmapped_nents; i++) kunmap(sg_page(&sg[i])); } static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn) { LIST_HEAD(ack_list); struct iscsi_cmd *cmd, *cmd_p; conn->exp_statsn = exp_statsn; if (conn->sess->sess_ops->RDMAExtensions) return; spin_lock_bh(&conn->cmd_lock); list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) { spin_lock(&cmd->istate_lock); if ((cmd->i_state == ISTATE_SENT_STATUS) && iscsi_sna_lt(cmd->stat_sn, exp_statsn)) { cmd->i_state = ISTATE_REMOVE; spin_unlock(&cmd->istate_lock); list_move_tail(&cmd->i_conn_node, &ack_list); continue; } spin_unlock(&cmd->istate_lock); } spin_unlock_bh(&conn->cmd_lock); list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) { list_del_init(&cmd->i_conn_node); iscsit_free_cmd(cmd, false); } } static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd) { u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE)); iov_count += ISCSI_IOV_DATA_BUFFER; cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL); if (!cmd->iov_data) return -ENOMEM; cmd->orig_iov_data_count = iov_count; return 0; } int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, unsigned char *buf) { int data_direction, payload_length; struct iscsi_scsi_req *hdr; int iscsi_task_attr; int sam_task_attr; atomic_long_inc(&conn->sess->cmd_pdus); hdr = (struct iscsi_scsi_req *) buf; payload_length = ntoh24(hdr->dlength); /* FIXME; Add checks for AdditionalHeaderSegment */ if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL" " not set. Bad iSCSI Initiator.\n"); return iscsit_add_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); } if (((hdr->flags & ISCSI_FLAG_CMD_READ) || (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) { /* * From RFC-3720 Section 10.3.1: * * "Either or both of R and W MAY be 1 when either the * Expected Data Transfer Length and/or Bidirectional Read * Expected Data Transfer Length are 0" * * For this case, go ahead and clear the unnecssary bits * to avoid any confusion with ->data_direction. */ hdr->flags &= ~ISCSI_FLAG_CMD_READ; hdr->flags &= ~ISCSI_FLAG_CMD_WRITE; pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE" " set when Expected Data Transfer Length is 0 for" " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]); } if (!(hdr->flags & ISCSI_FLAG_CMD_READ) && !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) { pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE" " MUST be set if Expected Data Transfer Length is not 0." " Bad iSCSI Initiator\n"); return iscsit_add_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); } if ((hdr->flags & ISCSI_FLAG_CMD_READ) && (hdr->flags & ISCSI_FLAG_CMD_WRITE)) { pr_err("Bidirectional operations not supported!\n"); return iscsit_add_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); } if (hdr->opcode & ISCSI_OP_IMMEDIATE) { pr_err("Illegally set Immediate Bit in iSCSI Initiator" " Scsi Command PDU.\n"); return iscsit_add_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); } if (payload_length && !conn->sess->sess_ops->ImmediateData) { pr_err("ImmediateData=No but DataSegmentLength=%u," " protocol error.\n", payload_length); return iscsit_add_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); } if ((be32_to_cpu(hdr->data_length) == payload_length) && (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) { pr_err("Expected Data Transfer Length and Length of" " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL" " bit is not set protocol error\n"); return iscsit_add_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); } if (payload_length > be32_to_cpu(hdr->data_length)) { pr_err("DataSegmentLength: %u is greater than" " EDTL: %u, protocol error.\n", payload_length, hdr->data_length); return iscsit_add_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); } if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { pr_err("DataSegmentLength: %u is greater than" " MaxXmitDataSegmentLength: %u, protocol error.\n", payload_length, conn->conn_ops->MaxXmitDataSegmentLength); return iscsit_add_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); } if (payload_length > conn->sess->sess_ops->FirstBurstLength) { pr_err("DataSegmentLength: %u is greater than" " FirstBurstLength: %u, protocol error.\n", payload_length, conn->sess->sess_ops->FirstBurstLength); return iscsit_add_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); } data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : DMA_NONE; cmd->data_direction = data_direction; iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK; /* * Figure out the SAM Task Attribute for the incoming SCSI CDB */ if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) sam_task_attr = TCM_SIMPLE_TAG; else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) sam_task_attr = TCM_ORDERED_TAG; else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) sam_task_attr = TCM_HEAD_TAG; else if (iscsi_task_attr == ISCSI_ATTR_ACA) sam_task_attr = TCM_ACA_TAG; else { pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" " TCM_SIMPLE_TAG\n", iscsi_task_attr); sam_task_attr = TCM_SIMPLE_TAG; } cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD; cmd->i_state = ISTATE_NEW_CMD; cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); cmd->immediate_data = (payload_length) ? 1 : 0; cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) && (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0); if (cmd->unsolicited_data) cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA; conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; if (hdr->flags & ISCSI_FLAG_CMD_READ) cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); else cmd->targ_xfer_tag = 0xFFFFFFFF; cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); cmd->first_burst_len = payload_length; if (!conn->sess->sess_ops->RDMAExtensions && cmd->data_direction == DMA_FROM_DEVICE) { struct iscsi_datain_req *dr; dr = iscsit_allocate_datain_req(); if (!dr) return iscsit_add_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); iscsit_attach_datain_req(cmd, dr); } /* * Initialize struct se_cmd descriptor from target_core_mod infrastructure */ transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, conn->sess->se_sess, be32_to_cpu(hdr->data_length), cmd->data_direction, sam_task_attr, cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun)); pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length, conn->cid); target_get_sess_cmd(&cmd->se_cmd, true); cmd->sense_reason = target_cmd_init_cdb(&cmd->se_cmd, hdr->cdb); if (cmd->sense_reason) { if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { return iscsit_add_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); } goto attach_cmd; } cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd); if (cmd->sense_reason) goto attach_cmd; /* only used for printks or comparing with ->ref_task_tag */ cmd->se_cmd.tag = (__force u32)cmd->init_task_tag; cmd->sense_reason = target_cmd_parse_cdb(&cmd->se_cmd); if (cmd->sense_reason) goto attach_cmd; if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { return iscsit_add_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); } attach_cmd: spin_lock_bh(&conn->cmd_lock); list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); spin_unlock_bh(&conn->cmd_lock); /* * Check if we need to delay processing because of ALUA * Active/NonOptimized primary access state.. */ core_alua_check_nonop_delay(&cmd->se_cmd); return 0; } EXPORT_SYMBOL(iscsit_setup_scsi_cmd); void iscsit_set_unsolicited_dataout(struct iscsi_cmd *cmd) { iscsit_set_dataout_sequence_values(cmd); spin_lock_bh(&cmd->dataout_timeout_lock); iscsit_start_dataout_timer(cmd, cmd->conn); spin_unlock_bh(&cmd->dataout_timeout_lock); } EXPORT_SYMBOL(iscsit_set_unsolicited_dataout); int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr) { int cmdsn_ret = 0; /* * Check the CmdSN against ExpCmdSN/MaxCmdSN here if * the Immediate Bit is not set, and no Immediate * Data is attached. * * A PDU/CmdSN carrying Immediate Data can only * be processed after the DataCRC has passed. * If the DataCRC fails, the CmdSN MUST NOT * be acknowledged. (See below) */ if (!cmd->immediate_data) { cmdsn_ret = iscsit_sequence_cmd(conn, cmd, (unsigned char *)hdr, hdr->cmdsn); if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) return -1; else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { target_put_sess_cmd(&cmd->se_cmd); return 0; } } iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); /* * If no Immediate Data is attached, it's OK to return now. */ if (!cmd->immediate_data) { if (!cmd->sense_reason && cmd->unsolicited_data) iscsit_set_unsolicited_dataout(cmd); if (!cmd->sense_reason) return 0; target_put_sess_cmd(&cmd->se_cmd); return 0; } /* * Early CHECK_CONDITIONs with ImmediateData never make it to command * execution. These exceptions are processed in CmdSN order using * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below. */ if (cmd->sense_reason) return 1; /* * Call directly into transport_generic_new_cmd() to perform * the backend memory allocation. */ cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); if (cmd->sense_reason) return 1; return 0; } EXPORT_SYMBOL(iscsit_process_scsi_cmd); static int iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr, bool dump_payload) { int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; int rc; /* * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. */ if (dump_payload) { u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done, cmd->first_burst_len); pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n", cmd->se_cmd.data_length, cmd->write_data_done, cmd->first_burst_len, length); rc = iscsit_dump_data_payload(cmd->conn, length, 1); pr_debug("Finished dumping immediate data\n"); if (rc < 0) immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER; } else { immed_ret = iscsit_handle_immediate_data(cmd, hdr, cmd->first_burst_len); } if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { /* * A PDU/CmdSN carrying Immediate Data passed * DataCRC, check against ExpCmdSN/MaxCmdSN if * Immediate Bit is not set. */ cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, (unsigned char *)hdr, hdr->cmdsn); if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) return -1; if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) { target_put_sess_cmd(&cmd->se_cmd); return 0; } else if (cmd->unsolicited_data) iscsit_set_unsolicited_dataout(cmd); } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { /* * Immediate Data failed DataCRC and ERL>=1, * silently drop this PDU and let the initiator * plug the CmdSN gap. * * FIXME: Send Unsolicited NOPIN with reserved * TTT here to help the initiator figure out * the missing CmdSN, although they should be * intelligent enough to determine the missing * CmdSN and issue a retry to plug the sequence. */ cmd->i_state = ISTATE_REMOVE; iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state); } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ return -1; return 0; } static int iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, unsigned char *buf) { struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; int rc, immed_data; bool dump_payload = false; rc = iscsit_setup_scsi_cmd(conn, cmd, buf); if (rc < 0) return 0; /* * Allocation iovecs needed for struct socket operations for * traditional iSCSI block I/O. */ if (iscsit_allocate_iovecs(cmd) < 0) { return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); } immed_data = cmd->immediate_data; rc = iscsit_process_scsi_cmd(conn, cmd, hdr); if (rc < 0) return rc; else if (rc > 0) dump_payload = true; if (!immed_data) return 0; return iscsit_get_immediate_data(cmd, hdr, dump_payload); } static u32 iscsit_do_crypto_hash_sg( struct ahash_request *hash, struct iscsi_cmd *cmd, u32 data_offset, u32 data_length, u32 padding, u8 *pad_bytes) { u32 data_crc; struct scatterlist *sg; unsigned int page_off; crypto_ahash_init(hash); sg = cmd->first_data_sg; page_off = cmd->first_data_sg_off; while (data_length) { u32 cur_len = min_t(u32, data_length, (sg->length - page_off)); ahash_request_set_crypt(hash, sg, NULL, cur_len); crypto_ahash_update(hash); data_length -= cur_len; page_off = 0; /* iscsit_map_iovec has already checked for invalid sg pointers */ sg = sg_next(sg); } if (padding) { struct scatterlist pad_sg; sg_init_one(&pad_sg, pad_bytes, padding); ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc, padding); crypto_ahash_finup(hash); } else { ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0); crypto_ahash_final(hash); } return data_crc; } static void iscsit_do_crypto_hash_buf(struct ahash_request *hash, const void *buf, u32 payload_length, u32 padding, const void *pad_bytes, void *data_crc) { struct scatterlist sg[2]; sg_init_table(sg, ARRAY_SIZE(sg)); sg_set_buf(sg, buf, payload_length); if (padding) sg_set_buf(sg + 1, pad_bytes, padding); ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding); crypto_ahash_digest(hash); } int __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf, struct iscsi_cmd *cmd, u32 payload_length, bool *success) { struct iscsi_data *hdr = buf; struct se_cmd *se_cmd; int rc; /* iSCSI write */ atomic_long_add(payload_length, &conn->sess->rx_data_octets); pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset), payload_length, conn->cid); if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { pr_err("Command ITT: 0x%08x received DataOUT after" " last DataOUT received, dumping payload\n", cmd->init_task_tag); return iscsit_dump_data_payload(conn, payload_length, 1); } if (cmd->data_direction != DMA_TO_DEVICE) { pr_err("Command ITT: 0x%08x received DataOUT for a" " NON-WRITE command.\n", cmd->init_task_tag); return iscsit_dump_data_payload(conn, payload_length, 1); } se_cmd = &cmd->se_cmd; iscsit_mod_dataout_timer(cmd); if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n", be32_to_cpu(hdr->offset), payload_length, cmd->se_cmd.data_length); return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); } if (cmd->unsolicited_data) { int dump_unsolicited_data = 0; if (conn->sess->sess_ops->InitialR2T) { pr_err("Received unexpected unsolicited data" " while InitialR2T=Yes, protocol error.\n"); transport_send_check_condition_and_sense(&cmd->se_cmd, TCM_UNEXPECTED_UNSOLICITED_DATA, 0); return -1; } /* * Special case for dealing with Unsolicited DataOUT * and Unsupported SAM WRITE Opcodes and SE resource allocation * failures; */ /* Something's amiss if we're not in WRITE_PENDING state... */ WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) dump_unsolicited_data = 1; if (dump_unsolicited_data) { /* * Check if a delayed TASK_ABORTED status needs to * be sent now if the ISCSI_FLAG_CMD_FINAL has been * received with the unsolicited data out. */ if (hdr->flags & ISCSI_FLAG_CMD_FINAL) iscsit_stop_dataout_timer(cmd); return iscsit_dump_data_payload(conn, payload_length, 1); } } else { /* * For the normal solicited data path: * * Check for a delayed TASK_ABORTED status and dump any * incoming data out payload if one exists. Also, when the * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current * data out sequence, we decrement outstanding_r2ts. Once * outstanding_r2ts reaches zero, go ahead and send the delayed * TASK_ABORTED status. */ if (se_cmd->transport_state & CMD_T_ABORTED) { if (hdr->flags & ISCSI_FLAG_CMD_FINAL && --cmd->outstanding_r2ts < 1) iscsit_stop_dataout_timer(cmd); return iscsit_dump_data_payload(conn, payload_length, 1); } } /* * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and * within-command recovery checks before receiving the payload. */ rc = iscsit_check_pre_dataout(cmd, buf); if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) return 0; else if (rc == DATAOUT_CANNOT_RECOVER) return -1; *success = true; return 0; } EXPORT_SYMBOL(__iscsit_check_dataout_hdr); int iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf, struct iscsi_cmd **out_cmd) { struct iscsi_data *hdr = buf; struct iscsi_cmd *cmd; u32 payload_length = ntoh24(hdr->dlength); int rc; bool success = false; if (!payload_length) { pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n"); return 0; } if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { pr_err_ratelimited("DataSegmentLength: %u is greater than" " MaxXmitDataSegmentLength: %u\n", payload_length, conn->conn_ops->MaxXmitDataSegmentLength); return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf); } cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length); if (!cmd) return 0; rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success); if (success) *out_cmd = cmd; return rc; } EXPORT_SYMBOL(iscsit_check_dataout_hdr); static int iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, struct iscsi_data *hdr) { struct kvec *iov; u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; u32 payload_length; int iov_ret, data_crc_failed = 0; payload_length = min_t(u32, cmd->se_cmd.data_length, ntoh24(hdr->dlength)); rx_size += payload_length; iov = &cmd->iov_data[0]; iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2, be32_to_cpu(hdr->offset), payload_length); if (iov_ret < 0) return -1; iov_count += iov_ret; padding = ((-payload_length) & 3); if (padding != 0) { iov[iov_count].iov_base = cmd->pad_bytes; iov[iov_count++].iov_len = padding; rx_size += padding; pr_debug("Receiving %u padding bytes.\n", padding); } if (conn->conn_ops->DataDigest) { iov[iov_count].iov_base = &checksum; iov[iov_count++].iov_len = ISCSI_CRC_LEN; rx_size += ISCSI_CRC_LEN; } WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count); rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); iscsit_unmap_iovec(cmd); if (rx_got != rx_size) return -1; if (conn->conn_ops->DataDigest) { u32 data_crc; data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, be32_to_cpu(hdr->offset), payload_length, padding, cmd->pad_bytes); if (checksum != data_crc) { pr_err("ITT: 0x%08x, Offset: %u, Length: %u," " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" " does not match computed 0x%08x\n", hdr->itt, hdr->offset, payload_length, hdr->datasn, checksum, data_crc); data_crc_failed = 1; } else { pr_debug("Got CRC32C DataDigest 0x%08x for" " %u bytes of Data Out\n", checksum, payload_length); } } return data_crc_failed; } int iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr, bool data_crc_failed) { struct iscsi_conn *conn = cmd->conn; int rc, ooo_cmdsn; /* * Increment post receive data and CRC values or perform * within-command recovery. */ rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) return 0; else if (rc == DATAOUT_SEND_R2T) { iscsit_set_dataout_sequence_values(cmd); conn->conn_transport->iscsit_get_dataout(conn, cmd, false); } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { /* * Handle extra special case for out of order * Unsolicited Data Out. */ spin_lock_bh(&cmd->istate_lock); ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; spin_unlock_bh(&cmd->istate_lock); iscsit_stop_dataout_timer(cmd); if (ooo_cmdsn) return 0; target_execute_cmd(&cmd->se_cmd); return 0; } else /* DATAOUT_CANNOT_RECOVER */ return -1; return 0; } EXPORT_SYMBOL(iscsit_check_dataout_payload); static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) { struct iscsi_cmd *cmd = NULL; struct iscsi_data *hdr = (struct iscsi_data *)buf; int rc; bool data_crc_failed = false; rc = iscsit_check_dataout_hdr(conn, buf, &cmd); if (rc < 0) return 0; else if (!cmd) return 0; rc = iscsit_get_dataout(conn, cmd, hdr); if (rc < 0) return rc; else if (rc > 0) data_crc_failed = true; return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); } int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, struct iscsi_nopout *hdr) { u32 payload_length = ntoh24(hdr->dlength); if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n"); if (!cmd) return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, (unsigned char *)hdr); return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, (unsigned char *)hdr); } if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { pr_err("NOPOUT ITT is reserved, but Immediate Bit is" " not set, protocol error.\n"); if (!cmd) return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, (unsigned char *)hdr); return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, (unsigned char *)hdr); } if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { pr_err("NOPOUT Ping Data DataSegmentLength: %u is" " greater than MaxXmitDataSegmentLength: %u, protocol" " error.\n", payload_length, conn->conn_ops->MaxXmitDataSegmentLength); if (!cmd) return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, (unsigned char *)hdr); return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, (unsigned char *)hdr); } pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", hdr->itt == RESERVED_ITT ? "Response" : "Request", hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, payload_length); /* * This is not a response to a Unsolicited NopIN, which means * it can either be a NOPOUT ping request (with a valid ITT), * or a NOPOUT not requesting a NOPIN (with a reserved ITT). * Either way, make sure we allocate an struct iscsi_cmd, as both * can contain ping data. */ if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; cmd->i_state = ISTATE_SEND_NOPIN; cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; cmd->targ_xfer_tag = 0xFFFFFFFF; cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); cmd->data_direction = DMA_NONE; } return 0; } EXPORT_SYMBOL(iscsit_setup_nop_out); int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, struct iscsi_nopout *hdr) { struct iscsi_cmd *cmd_p = NULL; int cmdsn_ret = 0; /* * Initiator is expecting a NopIN ping reply.. */ if (hdr->itt != RESERVED_ITT) { if (!cmd) return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, (unsigned char *)hdr); spin_lock_bh(&conn->cmd_lock); list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); spin_unlock_bh(&conn->cmd_lock); iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); if (hdr->opcode & ISCSI_OP_IMMEDIATE) { iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); return 0; } cmdsn_ret = iscsit_sequence_cmd(conn, cmd, (unsigned char *)hdr, hdr->cmdsn); if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) return 0; if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) return -1; return 0; } /* * This was a response to a unsolicited NOPIN ping. */ if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); if (!cmd_p) return -EINVAL; iscsit_stop_nopin_response_timer(conn); cmd_p->i_state = ISTATE_REMOVE; iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); iscsit_start_nopin_timer(conn); return 0; } /* * Otherwise, initiator is not expecting a NOPIN is response. * Just ignore for now. */ if (cmd) iscsit_free_cmd(cmd, false); return 0; } EXPORT_SYMBOL(iscsit_process_nop_out); static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, unsigned char *buf) { unsigned char *ping_data = NULL; struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; struct kvec *iov = NULL; u32 payload_length = ntoh24(hdr->dlength); int ret; ret = iscsit_setup_nop_out(conn, cmd, hdr); if (ret < 0) return 0; /* * Handle NOP-OUT payload for traditional iSCSI sockets */ if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { u32 checksum, data_crc, padding = 0; int niov = 0, rx_got, rx_size = payload_length; ping_data = kzalloc(payload_length + 1, GFP_KERNEL); if (!ping_data) { ret = -1; goto out; } iov = &cmd->iov_misc[0]; iov[niov].iov_base = ping_data; iov[niov++].iov_len = payload_length; padding = ((-payload_length) & 3); if (padding != 0) { pr_debug("Receiving %u additional bytes" " for padding.\n", padding); iov[niov].iov_base = &cmd->pad_bytes; iov[niov++].iov_len = padding; rx_size += padding; } if (conn->conn_ops->DataDigest) { iov[niov].iov_base = &checksum; iov[niov++].iov_len = ISCSI_CRC_LEN; rx_size += ISCSI_CRC_LEN; } WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc)); rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); if (rx_got != rx_size) { ret = -1; goto out; } if (conn->conn_ops->DataDigest) { iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data, payload_length, padding, cmd->pad_bytes, &data_crc); if (checksum != data_crc) { pr_err("Ping data CRC32C DataDigest" " 0x%08x does not match computed 0x%08x\n", checksum, data_crc); if (!conn->sess->sess_ops->ErrorRecoveryLevel) { pr_err("Unable to recover from" " NOPOUT Ping DataCRC failure while in" " ERL=0.\n"); ret = -1; goto out; } else { /* * Silently drop this PDU and let the * initiator plug the CmdSN gap. */ pr_debug("Dropping NOPOUT" " Command CmdSN: 0x%08x due to" " DataCRC error.\n", hdr->cmdsn); ret = 0; goto out; } } else { pr_debug("Got CRC32C DataDigest" " 0x%08x for %u bytes of ping data.\n", checksum, payload_length); } } ping_data[payload_length] = '\0'; /* * Attach ping data to struct iscsi_cmd->buf_ptr. */ cmd->buf_ptr = ping_data; cmd->buf_ptr_size = payload_length; pr_debug("Got %u bytes of NOPOUT ping" " data.\n", payload_length); pr_debug("Ping Data: \"%s\"\n", ping_data); } return iscsit_process_nop_out(conn, cmd, hdr); out: if (cmd) iscsit_free_cmd(cmd, false); kfree(ping_data); return ret; } static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf) { switch (iscsi_tmf) { case ISCSI_TM_FUNC_ABORT_TASK: return TMR_ABORT_TASK; case ISCSI_TM_FUNC_ABORT_TASK_SET: return TMR_ABORT_TASK_SET; case ISCSI_TM_FUNC_CLEAR_ACA: return TMR_CLEAR_ACA; case ISCSI_TM_FUNC_CLEAR_TASK_SET: return TMR_CLEAR_TASK_SET; case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: return TMR_LUN_RESET; case ISCSI_TM_FUNC_TARGET_WARM_RESET: return TMR_TARGET_WARM_RESET; case ISCSI_TM_FUNC_TARGET_COLD_RESET: return TMR_TARGET_COLD_RESET; default: return TMR_UNKNOWN; } } int iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, unsigned char *buf) { struct se_tmr_req *se_tmr; struct iscsi_tmr_req *tmr_req; struct iscsi_tm *hdr; int out_of_order_cmdsn = 0, ret; u8 function, tcm_function = TMR_UNKNOWN; hdr = (struct iscsi_tm *) buf; hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; function = hdr->flags; pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, hdr->rtt, hdr->refcmdsn, conn->cid); if ((function != ISCSI_TM_FUNC_ABORT_TASK) && ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && hdr->rtt != RESERVED_ITT)) { pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); hdr->rtt = RESERVED_ITT; } if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { pr_err("Task Management Request TASK_REASSIGN not" " issued as immediate command, bad iSCSI Initiator" "implementation\n"); return iscsit_add_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); } if ((function != ISCSI_TM_FUNC_ABORT_TASK) && be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); cmd->data_direction = DMA_NONE; cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL); if (!cmd->tmr_req) { return iscsit_add_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); } transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, conn->sess->se_sess, 0, DMA_NONE, TCM_SIMPLE_TAG, cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun)); target_get_sess_cmd(&cmd->se_cmd, true); /* * TASK_REASSIGN for ERL=2 / connection stays inside of * LIO-Target $FABRIC_MOD */ if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { tcm_function = iscsit_convert_tmf(function); if (tcm_function == TMR_UNKNOWN) { pr_err("Unknown iSCSI TMR Function:" " 0x%02x\n", function); return iscsit_add_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); } } ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function, GFP_KERNEL); if (ret < 0) return iscsit_add_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; cmd->i_state = ISTATE_SEND_TASKMGTRSP; cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); cmd->init_task_tag = hdr->itt; cmd->targ_xfer_tag = 0xFFFFFFFF; cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); se_tmr = cmd->se_cmd.se_tmr_req; tmr_req = cmd->tmr_req; /* * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN */ if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { ret = transport_lookup_tmr_lun(&cmd->se_cmd); if (ret < 0) { se_tmr->response = ISCSI_TMF_RSP_NO_LUN; goto attach; } } switch (function) { case ISCSI_TM_FUNC_ABORT_TASK: se_tmr->response = iscsit_tmr_abort_task(cmd, buf); if (se_tmr->response) goto attach; break; case ISCSI_TM_FUNC_ABORT_TASK_SET: case ISCSI_TM_FUNC_CLEAR_ACA: case ISCSI_TM_FUNC_CLEAR_TASK_SET: case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: break; case ISCSI_TM_FUNC_TARGET_WARM_RESET: if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; goto attach; } break; case ISCSI_TM_FUNC_TARGET_COLD_RESET: if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; goto attach; } break; case ISCSI_TM_FUNC_TASK_REASSIGN: se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); /* * Perform sanity checks on the ExpDataSN only if the * TASK_REASSIGN was successful. */ if (se_tmr->response) break; if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) return iscsit_add_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); break; default: pr_err("Unknown TMR function: 0x%02x, protocol" " error.\n", function); se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; goto attach; } if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) se_tmr->call_transport = 1; attach: spin_lock_bh(&conn->cmd_lock); list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); spin_unlock_bh(&conn->cmd_lock); if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) { out_of_order_cmdsn = 1; } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { target_put_sess_cmd(&cmd->se_cmd); return 0; } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) { return -1; } } iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) return 0; /* * Found the referenced task, send to transport for processing. */ if (se_tmr->call_transport) return transport_generic_handle_tmr(&cmd->se_cmd); /* * Could not find the referenced LUN, task, or Task Management * command not authorized or supported. Change state and * let the tx_thread send the response. * * For connection recovery, this is also the default action for * TMR TASK_REASSIGN. */ iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); target_put_sess_cmd(&cmd->se_cmd); return 0; } EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); /* #warning FIXME: Support Text Command parameters besides SendTargets */ int iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, struct iscsi_text *hdr) { u32 payload_length = ntoh24(hdr->dlength); if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { pr_err("Unable to accept text parameter length: %u" "greater than MaxXmitDataSegmentLength %u.\n", payload_length, conn->conn_ops->MaxXmitDataSegmentLength); return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, (unsigned char *)hdr); } if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) || (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) { pr_err("Multi sequence text commands currently not supported\n"); return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED, (unsigned char *)hdr); } pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, hdr->exp_statsn, payload_length); cmd->iscsi_opcode = ISCSI_OP_TEXT; cmd->i_state = ISTATE_SEND_TEXTRSP; cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; cmd->targ_xfer_tag = 0xFFFFFFFF; cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); cmd->data_direction = DMA_NONE; kfree(cmd->text_in_ptr); cmd->text_in_ptr = NULL; return 0; } EXPORT_SYMBOL(iscsit_setup_text_cmd); int iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, struct iscsi_text *hdr) { unsigned char *text_in = cmd->text_in_ptr, *text_ptr; int cmdsn_ret; if (!text_in) { cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt); if (cmd->targ_xfer_tag == 0xFFFFFFFF) { pr_err("Unable to locate text_in buffer for sendtargets" " discovery\n"); goto reject; } goto empty_sendtargets; } if (strncmp("SendTargets=", text_in, 12) != 0) { pr_err("Received Text Data that is not" " SendTargets, cannot continue.\n"); goto reject; } /* '=' confirmed in strncmp */ text_ptr = strchr(text_in, '='); BUG_ON(!text_ptr); if (!strncmp("=All", text_ptr, 5)) { cmd->cmd_flags |= ICF_SENDTARGETS_ALL; } else if (!strncmp("=iqn.", text_ptr, 5) || !strncmp("=eui.", text_ptr, 5)) { cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE; } else { pr_err("Unable to locate valid SendTargets%s value\n", text_ptr); goto reject; } spin_lock_bh(&conn->cmd_lock); list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); spin_unlock_bh(&conn->cmd_lock); empty_sendtargets: iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { cmdsn_ret = iscsit_sequence_cmd(conn, cmd, (unsigned char *)hdr, hdr->cmdsn); if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) return -1; return 0; } return iscsit_execute_cmd(cmd, 0); reject: return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, (unsigned char *)hdr); } EXPORT_SYMBOL(iscsit_process_text_cmd); static int iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, unsigned char *buf) { struct iscsi_text *hdr = (struct iscsi_text *)buf; char *text_in = NULL; u32 payload_length = ntoh24(hdr->dlength); int rx_size, rc; rc = iscsit_setup_text_cmd(conn, cmd, hdr); if (rc < 0) return 0; rx_size = payload_length; if (payload_length) { u32 checksum = 0, data_crc = 0; u32 padding = 0; int niov = 0, rx_got; struct kvec iov[2]; rx_size = ALIGN(payload_length, 4); text_in = kzalloc(rx_size, GFP_KERNEL); if (!text_in) goto reject; cmd->text_in_ptr = text_in; memset(iov, 0, sizeof(iov)); iov[niov].iov_base = text_in; iov[niov++].iov_len = rx_size; padding = rx_size - payload_length; if (padding) pr_debug("Receiving %u additional bytes" " for padding.\n", padding); if (conn->conn_ops->DataDigest) { iov[niov].iov_base = &checksum; iov[niov++].iov_len = ISCSI_CRC_LEN; rx_size += ISCSI_CRC_LEN; } WARN_ON_ONCE(niov > ARRAY_SIZE(iov)); rx_got = rx_data(conn, &iov[0], niov, rx_size); if (rx_got != rx_size) goto reject; if (conn->conn_ops->DataDigest) { iscsit_do_crypto_hash_buf(conn->conn_rx_hash, text_in, rx_size, 0, NULL, &data_crc); if (checksum != data_crc) { pr_err("Text data CRC32C DataDigest" " 0x%08x does not match computed" " 0x%08x\n", checksum, data_crc); if (!conn->sess->sess_ops->ErrorRecoveryLevel) { pr_err("Unable to recover from" " Text Data digest failure while in" " ERL=0.\n"); goto reject; } else { /* * Silently drop this PDU and let the * initiator plug the CmdSN gap. */ pr_debug("Dropping Text" " Command CmdSN: 0x%08x due to" " DataCRC error.\n", hdr->cmdsn); kfree(text_in); return 0; } } else { pr_debug("Got CRC32C DataDigest" " 0x%08x for %u bytes of text data.\n", checksum, payload_length); } } text_in[payload_length - 1] = '\0'; pr_debug("Successfully read %d bytes of text" " data.\n", payload_length); } return iscsit_process_text_cmd(conn, cmd, hdr); reject: kfree(cmd->text_in_ptr); cmd->text_in_ptr = NULL; return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); } int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) { struct iscsi_conn *conn_p; struct iscsi_session *sess = conn->sess; pr_debug("Received logout request CLOSESESSION on CID: %hu" " for SID: %u.\n", conn->cid, conn->sess->sid); atomic_set(&sess->session_logout, 1); atomic_set(&conn->conn_logout_remove, 1); conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; iscsit_inc_conn_usage_count(conn); iscsit_inc_session_usage_count(sess); spin_lock_bh(&sess->conn_lock); list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) continue; pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; } spin_unlock_bh(&sess->conn_lock); iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); return 0; } int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) { struct iscsi_conn *l_conn; struct iscsi_session *sess = conn->sess; pr_debug("Received logout request CLOSECONNECTION for CID:" " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); /* * A Logout Request with a CLOSECONNECTION reason code for a CID * can arrive on a connection with a differing CID. */ if (conn->cid == cmd->logout_cid) { spin_lock_bh(&conn->state_lock); pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; atomic_set(&conn->conn_logout_remove, 1); conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; iscsit_inc_conn_usage_count(conn); spin_unlock_bh(&conn->state_lock); } else { /* * Handle all different cid CLOSECONNECTION requests in * iscsit_logout_post_handler_diffcid() as to give enough * time for any non immediate command's CmdSN to be * acknowledged on the connection in question. * * Here we simply make sure the CID is still around. */ l_conn = iscsit_get_conn_from_cid(sess, cmd->logout_cid); if (!l_conn) { cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); return 0; } iscsit_dec_conn_usage_count(l_conn); } iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); return 0; } int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) { struct iscsi_session *sess = conn->sess; pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); if (sess->sess_ops->ErrorRecoveryLevel != 2) { pr_err("Received Logout Request REMOVECONNFORRECOVERY" " while ERL!=2.\n"); cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); return 0; } if (conn->cid == cmd->logout_cid) { pr_err("Received Logout Request REMOVECONNFORRECOVERY" " with CID: %hu on CID: %hu, implementation error.\n", cmd->logout_cid, conn->cid); cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); return 0; } iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); return 0; } int iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, unsigned char *buf) { int cmdsn_ret, logout_remove = 0; u8 reason_code = 0; struct iscsi_logout *hdr; struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); hdr = (struct iscsi_logout *) buf; reason_code = (hdr->flags & 0x7f); if (tiqn) { spin_lock(&tiqn->logout_stats.lock); if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) tiqn->logout_stats.normal_logouts++; else tiqn->logout_stats.abnormal_logouts++; spin_unlock(&tiqn->logout_stats.lock); } pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, hdr->cid, conn->cid); if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { pr_err("Received logout request on connection that" " is not in logged in state, ignoring request.\n"); iscsit_free_cmd(cmd, false); return 0; } cmd->iscsi_opcode = ISCSI_OP_LOGOUT; cmd->i_state = ISTATE_SEND_LOGOUTRSP; cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; cmd->targ_xfer_tag = 0xFFFFFFFF; cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); cmd->logout_cid = be16_to_cpu(hdr->cid); cmd->logout_reason = reason_code; cmd->data_direction = DMA_NONE; /* * We need to sleep in these cases (by returning 1) until the Logout * Response gets sent in the tx thread. */ if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && be16_to_cpu(hdr->cid) == conn->cid)) logout_remove = 1; spin_lock_bh(&conn->cmd_lock); list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); spin_unlock_bh(&conn->cmd_lock); if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); /* * Immediate commands are executed, well, immediately. * Non-Immediate Logout Commands are executed in CmdSN order. */ if (cmd->immediate_cmd) { int ret = iscsit_execute_cmd(cmd, 0); if (ret < 0) return ret; } else { cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) logout_remove = 0; else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) return -1; } return logout_remove; } EXPORT_SYMBOL(iscsit_handle_logout_cmd); int iscsit_handle_snack( struct iscsi_conn *conn, unsigned char *buf) { struct iscsi_snack *hdr; hdr = (struct iscsi_snack *) buf; hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, hdr->begrun, hdr->runlength, conn->cid); if (!conn->sess->sess_ops->ErrorRecoveryLevel) { pr_err("Initiator sent SNACK request while in" " ErrorRecoveryLevel=0.\n"); return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf); } /* * SNACK_DATA and SNACK_R2T are both 0, so check which function to * call from inside iscsi_send_recovery_datain_or_r2t(). */ switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { case 0: return iscsit_handle_recovery_datain_or_r2t(conn, buf, hdr->itt, be32_to_cpu(hdr->ttt), be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); case ISCSI_FLAG_SNACK_TYPE_STATUS: return iscsit_handle_status_snack(conn, hdr->itt, be32_to_cpu(hdr->ttt), be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); case ISCSI_FLAG_SNACK_TYPE_RDATA: /* FIXME: Support R-Data SNACK */ pr_err("R-Data SNACK Not Supported.\n"); return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf); default: pr_err("Unknown SNACK type 0x%02x, protocol" " error.\n", hdr->flags & 0x0f); return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf); } return 0; } EXPORT_SYMBOL(iscsit_handle_snack); static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) { if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { wait_for_completion_interruptible_timeout( &conn->rx_half_close_comp, ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); } } static int iscsit_handle_immediate_data( struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr, u32 length) { int iov_ret, rx_got = 0, rx_size = 0; u32 checksum, iov_count = 0, padding = 0; struct iscsi_conn *conn = cmd->conn; struct kvec *iov; void *overflow_buf = NULL; BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length); rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length); iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->orig_iov_data_count - 2, cmd->write_data_done, rx_size); if (iov_ret < 0) return IMMEDIATE_DATA_CANNOT_RECOVER; iov_count = iov_ret; iov = &cmd->iov_data[0]; if (rx_size < length) { /* * Special case: length of immediate data exceeds the data * buffer size derived from the CDB. */ overflow_buf = kmalloc(length - rx_size, GFP_KERNEL); if (!overflow_buf) { iscsit_unmap_iovec(cmd); return IMMEDIATE_DATA_CANNOT_RECOVER; } cmd->overflow_buf = overflow_buf; iov[iov_count].iov_base = overflow_buf; iov[iov_count].iov_len = length - rx_size; iov_count++; rx_size = length; } padding = ((-length) & 3); if (padding != 0) { iov[iov_count].iov_base = cmd->pad_bytes; iov[iov_count++].iov_len = padding; rx_size += padding; } if (conn->conn_ops->DataDigest) { iov[iov_count].iov_base = &checksum; iov[iov_count++].iov_len = ISCSI_CRC_LEN; rx_size += ISCSI_CRC_LEN; } WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count); rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); iscsit_unmap_iovec(cmd); if (rx_got != rx_size) { iscsit_rx_thread_wait_for_tcp(conn); return IMMEDIATE_DATA_CANNOT_RECOVER; } if (conn->conn_ops->DataDigest) { u32 data_crc; data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, cmd->write_data_done, length, padding, cmd->pad_bytes); if (checksum != data_crc) { pr_err("ImmediateData CRC32C DataDigest 0x%08x" " does not match computed 0x%08x\n", checksum, data_crc); if (!conn->sess->sess_ops->ErrorRecoveryLevel) { pr_err("Unable to recover from" " Immediate Data digest failure while" " in ERL=0.\n"); iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR, (unsigned char *)hdr); return IMMEDIATE_DATA_CANNOT_RECOVER; } else { iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR, (unsigned char *)hdr); return IMMEDIATE_DATA_ERL1_CRC_FAILURE; } } else { pr_debug("Got CRC32C DataDigest 0x%08x for" " %u bytes of Immediate Data\n", checksum, length); } } cmd->write_data_done += length; if (cmd->write_data_done == cmd->se_cmd.data_length) { spin_lock_bh(&cmd->istate_lock); cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; spin_unlock_bh(&cmd->istate_lock); } return IMMEDIATE_DATA_NORMAL_OPERATION; } /* #warning iscsi_build_conn_drop_async_message() only sends out on connections with active network interface */ static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) { struct iscsi_cmd *cmd; struct iscsi_conn *conn_p; bool found = false; lockdep_assert_held(&conn->sess->conn_lock); /* * Only send a Asynchronous Message on connections whos network * interface is still functional. */ list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { iscsit_inc_conn_usage_count(conn_p); found = true; break; } } if (!found) return; cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); if (!cmd) { iscsit_dec_conn_usage_count(conn_p); return; } cmd->logout_cid = conn->cid; cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; cmd->i_state = ISTATE_SEND_ASYNCMSG; spin_lock_bh(&conn_p->cmd_lock); list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); spin_unlock_bh(&conn_p->cmd_lock); iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); iscsit_dec_conn_usage_count(conn_p); } static int iscsit_send_conn_drop_async_message( struct iscsi_cmd *cmd, struct iscsi_conn *conn) { struct iscsi_async *hdr; cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; hdr = (struct iscsi_async *) cmd->pdu; hdr->opcode = ISCSI_OP_ASYNC_EVENT; hdr->flags = ISCSI_FLAG_CMD_FINAL; cmd->init_task_tag = RESERVED_ITT; cmd->targ_xfer_tag = 0xFFFFFFFF; put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); cmd->stat_sn = conn->stat_sn++; hdr->statsn = cpu_to_be32(cmd->stat_sn); hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; hdr->param1 = cpu_to_be16(cmd->logout_cid); hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); pr_debug("Sending Connection Dropped Async Message StatSN:" " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, cmd->logout_cid, conn->cid); return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); } static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) { if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { wait_for_completion_interruptible_timeout( &conn->tx_half_close_comp, ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); } } void iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, bool set_statsn) { hdr->opcode = ISCSI_OP_SCSI_DATA_IN; hdr->flags = datain->flags; if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); } } hton24(hdr->dlength, datain->length); if (hdr->flags & ISCSI_FLAG_DATA_ACK) int_to_scsilun(cmd->se_cmd.orig_fe_lun, (struct scsi_lun *)&hdr->lun); else put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); hdr->itt = cmd->init_task_tag; if (hdr->flags & ISCSI_FLAG_DATA_ACK) hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); else hdr->ttt = cpu_to_be32(0xFFFFFFFF); if (set_statsn) hdr->statsn = cpu_to_be32(cmd->stat_sn); else hdr->statsn = cpu_to_be32(0xFFFFFFFF); hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); hdr->datasn = cpu_to_be32(datain->data_sn); hdr->offset = cpu_to_be32(datain->offset); pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), ntohl(hdr->offset), datain->length, conn->cid); } EXPORT_SYMBOL(iscsit_build_datain_pdu); static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn) { struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; struct iscsi_datain datain; struct iscsi_datain_req *dr; int eodr = 0, ret; bool set_statsn = false; memset(&datain, 0, sizeof(struct iscsi_datain)); dr = iscsit_get_datain_values(cmd, &datain); if (!dr) { pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", cmd->init_task_tag); return -1; } /* * Be paranoid and double check the logic for now. */ if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { pr_err("Command ITT: 0x%08x, datain.offset: %u and" " datain.length: %u exceeds cmd->data_length: %u\n", cmd->init_task_tag, datain.offset, datain.length, cmd->se_cmd.data_length); return -1; } atomic_long_add(datain.length, &conn->sess->tx_data_octets); /* * Special case for successfully execution w/ both DATAIN * and Sense Data. */ if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) datain.flags &= ~ISCSI_FLAG_DATA_STATUS; else { if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { iscsit_increment_maxcmdsn(cmd, conn->sess); cmd->stat_sn = conn->stat_sn++; set_statsn = true; } else if (dr->dr_complete == DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) set_statsn = true; } iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0); if (ret < 0) return ret; if (dr->dr_complete) { eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2 : 1; iscsit_free_datain_req(cmd, dr); } return eodr; } int iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, struct iscsi_logout_rsp *hdr) { struct iscsi_conn *logout_conn = NULL; struct iscsi_conn_recovery *cr = NULL; struct iscsi_session *sess = conn->sess; /* * The actual shutting down of Sessions and/or Connections * for CLOSESESSION and CLOSECONNECTION Logout Requests * is done in scsi_logout_post_handler(). */ switch (cmd->logout_reason) { case ISCSI_LOGOUT_REASON_CLOSE_SESSION: pr_debug("iSCSI session logout successful, setting" " logout response to ISCSI_LOGOUT_SUCCESS.\n"); cmd->logout_response = ISCSI_LOGOUT_SUCCESS; break; case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) break; /* * For CLOSECONNECTION logout requests carrying * a matching logout CID -> local CID, the reference * for the local CID will have been incremented in * iscsi_logout_closeconnection(). * * For CLOSECONNECTION logout requests carrying * a different CID than the connection it arrived * on, the connection responding to cmd->logout_cid * is stopped in iscsit_logout_post_handler_diffcid(). */ pr_debug("iSCSI CID: %hu logout on CID: %hu" " successful.\n", cmd->logout_cid, conn->cid); cmd->logout_response = ISCSI_LOGOUT_SUCCESS; break; case ISCSI_LOGOUT_REASON_RECOVERY: if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) break; /* * If the connection is still active from our point of view * force connection recovery to occur. */ logout_conn = iscsit_get_conn_from_cid_rcfr(sess, cmd->logout_cid); if (logout_conn) { iscsit_connection_reinstatement_rcfr(logout_conn); iscsit_dec_conn_usage_count(logout_conn); } cr = iscsit_get_inactive_connection_recovery_entry( conn->sess, cmd->logout_cid); if (!cr) { pr_err("Unable to locate CID: %hu for" " REMOVECONNFORRECOVERY Logout Request.\n", cmd->logout_cid); cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; break; } iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); pr_debug("iSCSI REMOVECONNFORRECOVERY logout" " for recovery for CID: %hu on CID: %hu successful.\n", cmd->logout_cid, conn->cid); cmd->logout_response = ISCSI_LOGOUT_SUCCESS; break; default: pr_err("Unknown cmd->logout_reason: 0x%02x\n", cmd->logout_reason); return -1; } hdr->opcode = ISCSI_OP_LOGOUT_RSP; hdr->flags |= ISCSI_FLAG_CMD_FINAL; hdr->response = cmd->logout_response; hdr->itt = cmd->init_task_tag; cmd->stat_sn = conn->stat_sn++; hdr->statsn = cpu_to_be32(cmd->stat_sn); iscsit_increment_maxcmdsn(cmd, conn->sess); hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); pr_debug("Built Logout Response ITT: 0x%08x StatSN:" " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", cmd->init_task_tag, cmd->stat_sn, hdr->response, cmd->logout_cid, conn->cid); return 0; } EXPORT_SYMBOL(iscsit_build_logout_rsp); static int iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn) { int rc; rc = iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)&cmd->pdu[0]); if (rc < 0) return rc; return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); } void iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, struct iscsi_nopin *hdr, bool nopout_response) { hdr->opcode = ISCSI_OP_NOOP_IN; hdr->flags |= ISCSI_FLAG_CMD_FINAL; hton24(hdr->dlength, cmd->buf_ptr_size); if (nopout_response) put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); hdr->itt = cmd->init_task_tag; hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : conn->stat_sn; hdr->statsn = cpu_to_be32(cmd->stat_sn); if (nopout_response) iscsit_increment_maxcmdsn(cmd, conn->sess); hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," " StatSN: 0x%08x, Length %u\n", (nopout_response) ? "Solicited" : "Unsolicited", cmd->init_task_tag, cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); } EXPORT_SYMBOL(iscsit_build_nopin_rsp); /* * Unsolicited NOPIN, either requesting a response or not. */ static int iscsit_send_unsolicited_nopin( struct iscsi_cmd *cmd, struct iscsi_conn *conn, int want_response) { struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; int ret; iscsit_build_nopin_rsp(cmd, conn, hdr, false); pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); if (ret < 0) return ret; spin_lock_bh(&cmd->istate_lock); cmd->i_state = want_response ? ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; spin_unlock_bh(&cmd->istate_lock); return 0; } static int iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn) { struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; iscsit_build_nopin_rsp(cmd, conn, hdr, true); /* * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. */ pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size); return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, cmd->buf_ptr, cmd->buf_ptr_size); } static int iscsit_send_r2t( struct iscsi_cmd *cmd, struct iscsi_conn *conn) { struct iscsi_r2t *r2t; struct iscsi_r2t_rsp *hdr; int ret; r2t = iscsit_get_r2t_from_list(cmd); if (!r2t) return -1; hdr = (struct iscsi_r2t_rsp *) cmd->pdu; memset(hdr, 0, ISCSI_HDR_LEN); hdr->opcode = ISCSI_OP_R2T; hdr->flags |= ISCSI_FLAG_CMD_FINAL; int_to_scsilun(cmd->se_cmd.orig_fe_lun, (struct scsi_lun *)&hdr->lun); hdr->itt = cmd->init_task_tag; if (conn->conn_transport->iscsit_get_r2t_ttt) conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t); else r2t->targ_xfer_tag = session_get_next_ttt(conn->sess); hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); hdr->statsn = cpu_to_be32(conn->stat_sn); hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); hdr->data_offset = cpu_to_be32(r2t->offset); hdr->data_length = cpu_to_be32(r2t->xfer_len); pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, r2t->offset, r2t->xfer_len, conn->cid); spin_lock_bh(&cmd->r2t_lock); r2t->sent_r2t = 1; spin_unlock_bh(&cmd->r2t_lock); ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); if (ret < 0) { return ret; } spin_lock_bh(&cmd->dataout_timeout_lock); iscsit_start_dataout_timer(cmd, conn); spin_unlock_bh(&cmd->dataout_timeout_lock); return 0; } /* * @recovery: If called from iscsi_task_reassign_complete_write() for * connection recovery. */ int iscsit_build_r2ts_for_cmd( struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery) { int first_r2t = 1; u32 offset = 0, xfer_len = 0; spin_lock_bh(&cmd->r2t_lock); if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { spin_unlock_bh(&cmd->r2t_lock); return 0; } if (conn->sess->sess_ops->DataSequenceInOrder && !recovery) cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { if (conn->sess->sess_ops->DataSequenceInOrder) { offset = cmd->r2t_offset; if (first_r2t && recovery) { int new_data_end = offset + conn->sess->sess_ops->MaxBurstLength - cmd->next_burst_len; if (new_data_end > cmd->se_cmd.data_length) xfer_len = cmd->se_cmd.data_length - offset; else xfer_len = conn->sess->sess_ops->MaxBurstLength - cmd->next_burst_len; } else { int new_data_end = offset + conn->sess->sess_ops->MaxBurstLength; if (new_data_end > cmd->se_cmd.data_length) xfer_len = cmd->se_cmd.data_length - offset; else xfer_len = conn->sess->sess_ops->MaxBurstLength; } if ((s32)xfer_len < 0) { cmd->cmd_flags |= ICF_SENT_LAST_R2T; break; } cmd->r2t_offset += xfer_len; if (cmd->r2t_offset == cmd->se_cmd.data_length) cmd->cmd_flags |= ICF_SENT_LAST_R2T; } else { struct iscsi_seq *seq; seq = iscsit_get_seq_holder_for_r2t(cmd); if (!seq) { spin_unlock_bh(&cmd->r2t_lock); return -1; } offset = seq->offset; xfer_len = seq->xfer_len; if (cmd->seq_send_order == cmd->seq_count) cmd->cmd_flags |= ICF_SENT_LAST_R2T; } cmd->outstanding_r2ts++; first_r2t = 0; if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { spin_unlock_bh(&cmd->r2t_lock); return -1; } if (cmd->cmd_flags & ICF_SENT_LAST_R2T) break; } spin_unlock_bh(&cmd->r2t_lock); return 0; } EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd); void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) { if (inc_stat_sn) cmd->stat_sn = conn->stat_sn++; atomic_long_inc(&conn->sess->rsp_pdus); memset(hdr, 0, ISCSI_HDR_LEN); hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; hdr->flags |= ISCSI_FLAG_CMD_FINAL; if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); } hdr->response = cmd->iscsi_response; hdr->cmd_status = cmd->se_cmd.scsi_status; hdr->itt = cmd->init_task_tag; hdr->statsn = cpu_to_be32(cmd->stat_sn); iscsit_increment_maxcmdsn(cmd, conn->sess); hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, cmd->se_cmd.scsi_status, conn->cid); } EXPORT_SYMBOL(iscsit_build_rsp_pdu); static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn) { struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); void *data_buf = NULL; u32 padding = 0, data_buf_len = 0; iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); /* * Attach SENSE DATA payload to iSCSI Response PDU */ if (cmd->se_cmd.sense_buffer && ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); cmd->se_cmd.scsi_sense_length += sizeof (__be16); padding = -(cmd->se_cmd.scsi_sense_length) & 3; hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); data_buf = cmd->sense_buffer; data_buf_len = cmd->se_cmd.scsi_sense_length + padding; if (padding) { memset(cmd->sense_buffer + cmd->se_cmd.scsi_sense_length, 0, padding); pr_debug("Adding %u bytes of padding to" " SENSE.\n", padding); } pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" " Response PDU\n", cmd->se_cmd.scsi_sense_length); } return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf, data_buf_len); } static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) { switch (se_tmr->response) { case TMR_FUNCTION_COMPLETE: return ISCSI_TMF_RSP_COMPLETE; case TMR_TASK_DOES_NOT_EXIST: return ISCSI_TMF_RSP_NO_TASK; case TMR_LUN_DOES_NOT_EXIST: return ISCSI_TMF_RSP_NO_LUN; case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: return ISCSI_TMF_RSP_NOT_SUPPORTED; case TMR_FUNCTION_REJECTED: default: return ISCSI_TMF_RSP_REJECTED; } } void iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, struct iscsi_tm_rsp *hdr) { struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; hdr->flags = ISCSI_FLAG_CMD_FINAL; hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); hdr->itt = cmd->init_task_tag; cmd->stat_sn = conn->stat_sn++; hdr->statsn = cpu_to_be32(cmd->stat_sn); iscsit_increment_maxcmdsn(cmd, conn->sess); hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); pr_debug("Built Task Management Response ITT: 0x%08x," " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); } EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); static int iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) { struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; iscsit_build_task_mgt_rsp(cmd, conn, hdr); return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); } #define SENDTARGETS_BUF_LIMIT 32768U static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd, enum iscsit_transport_type network_transport, int skip_bytes, bool *completed) { char *payload = NULL; struct iscsi_conn *conn = cmd->conn; struct iscsi_portal_group *tpg; struct iscsi_tiqn *tiqn; struct iscsi_tpg_np *tpg_np; int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; int target_name_printed; unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; bool active; buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength, SENDTARGETS_BUF_LIMIT); payload = kzalloc(buffer_len, GFP_KERNEL); if (!payload) return -ENOMEM; /* * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE * explicit case.. */ if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) { text_ptr = strchr(text_in, '='); if (!text_ptr) { pr_err("Unable to locate '=' string in text_in:" " %s\n", text_in); kfree(payload); return -EINVAL; } /* * Skip over '=' character.. */ text_ptr += 1; } spin_lock(&tiqn_lock); list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) && strcmp(tiqn->tiqn, text_ptr)) { continue; } target_name_printed = 0; spin_lock(&tiqn->tiqn_tpg_lock); list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { /* If demo_mode_discovery=0 and generate_node_acls=0 * (demo mode dislabed) do not return * TargetName+TargetAddress unless a NodeACL exists. */ if ((tpg->tpg_attrib.generate_node_acls == 0) && (tpg->tpg_attrib.demo_mode_discovery == 0) && (!target_tpg_has_node_acl(&tpg->tpg_se_tpg, cmd->conn->sess->sess_ops->InitiatorName))) { continue; } spin_lock(&tpg->tpg_state_lock); active = (tpg->tpg_state == TPG_STATE_ACTIVE); spin_unlock(&tpg->tpg_state_lock); if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets) continue; spin_lock(&tpg->tpg_np_lock); list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, tpg_np_list) { struct iscsi_np *np = tpg_np->tpg_np; struct sockaddr_storage *sockaddr; if (np->np_network_transport != network_transport) continue; if (!target_name_printed) { len = sprintf(buf, "TargetName=%s", tiqn->tiqn); len += 1; if ((len + payload_len) > buffer_len) { spin_unlock(&tpg->tpg_np_lock); spin_unlock(&tiqn->tiqn_tpg_lock); end_of_buf = 1; goto eob; } if (skip_bytes && len <= skip_bytes) { skip_bytes -= len; } else { memcpy(payload + payload_len, buf, len); payload_len += len; target_name_printed = 1; if (len > skip_bytes) skip_bytes = 0; } } if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr)) sockaddr = &conn->local_sockaddr; else sockaddr = &np->np_sockaddr; len = sprintf(buf, "TargetAddress=" "%pISpc,%hu", sockaddr, tpg->tpgt); len += 1; if ((len + payload_len) > buffer_len) { spin_unlock(&tpg->tpg_np_lock); spin_unlock(&tiqn->tiqn_tpg_lock); end_of_buf = 1; goto eob; } if (skip_bytes && len <= skip_bytes) { skip_bytes -= len; } else { memcpy(payload + payload_len, buf, len); payload_len += len; if (len > skip_bytes) skip_bytes = 0; } } spin_unlock(&tpg->tpg_np_lock); } spin_unlock(&tiqn->tiqn_tpg_lock); eob: if (end_of_buf) { *completed = false; break; } if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) break; } spin_unlock(&tiqn_lock); cmd->buf_ptr = payload; return payload_len; } int iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, struct iscsi_text_rsp *hdr, enum iscsit_transport_type network_transport) { int text_length, padding; bool completed = true; text_length = iscsit_build_sendtargets_response(cmd, network_transport, cmd->read_data_done, &completed); if (text_length < 0) return text_length; if (completed) { hdr->flags = ISCSI_FLAG_CMD_FINAL; } else { hdr->flags = ISCSI_FLAG_TEXT_CONTINUE; cmd->read_data_done += text_length; if (cmd->targ_xfer_tag == 0xFFFFFFFF) cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); } hdr->opcode = ISCSI_OP_TEXT_RSP; padding = ((-text_length) & 3); hton24(hdr->dlength, text_length); hdr->itt = cmd->init_task_tag; hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); cmd->stat_sn = conn->stat_sn++; hdr->statsn = cpu_to_be32(cmd->stat_sn); iscsit_increment_maxcmdsn(cmd, conn->sess); /* * Reset maxcmdsn_inc in multi-part text payload exchanges to * correctly increment MaxCmdSN for each response answering a * non immediate text request with a valid CmdSN. */ cmd->maxcmdsn_inc = 0; hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x," " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag, cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid, !!(hdr->flags & ISCSI_FLAG_CMD_FINAL), !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)); return text_length + padding; } EXPORT_SYMBOL(iscsit_build_text_rsp); static int iscsit_send_text_rsp( struct iscsi_cmd *cmd, struct iscsi_conn *conn) { struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; int text_length; text_length = iscsit_build_text_rsp(cmd, conn, hdr, conn->conn_transport->transport_type); if (text_length < 0) return text_length; return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, cmd->buf_ptr, text_length); } void iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn, struct iscsi_reject *hdr) { hdr->opcode = ISCSI_OP_REJECT; hdr->reason = cmd->reject_reason; hdr->flags |= ISCSI_FLAG_CMD_FINAL; hton24(hdr->dlength, ISCSI_HDR_LEN); hdr->ffffffff = cpu_to_be32(0xffffffff); cmd->stat_sn = conn->stat_sn++; hdr->statsn = cpu_to_be32(cmd->stat_sn); hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); } EXPORT_SYMBOL(iscsit_build_reject); static int iscsit_send_reject( struct iscsi_cmd *cmd, struct iscsi_conn *conn) { struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; iscsit_build_reject(cmd, conn, hdr); pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, cmd->buf_ptr, ISCSI_HDR_LEN); } void iscsit_thread_get_cpumask(struct iscsi_conn *conn) { int ord, cpu; /* * bitmap_id is assigned from iscsit_global->ts_bitmap from * within iscsit_start_kthreads() * * Here we use bitmap_id to determine which CPU that this * iSCSI connection's RX/TX threads will be scheduled to * execute upon. */ ord = conn->bitmap_id % cpumask_weight(cpu_online_mask); for_each_online_cpu(cpu) { if (ord-- == 0) { cpumask_set_cpu(cpu, conn->conn_cpumask); return; } } /* * This should never be reached.. */ dump_stack(); cpumask_setall(conn->conn_cpumask); } int iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) { int ret; switch (state) { case ISTATE_SEND_R2T: ret = iscsit_send_r2t(cmd, conn); if (ret < 0) goto err; break; case ISTATE_REMOVE: spin_lock_bh(&conn->cmd_lock); list_del_init(&cmd->i_conn_node); spin_unlock_bh(&conn->cmd_lock); iscsit_free_cmd(cmd, false); break; case ISTATE_SEND_NOPIN_WANT_RESPONSE: iscsit_mod_nopin_response_timer(conn); ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); if (ret < 0) goto err; break; case ISTATE_SEND_NOPIN_NO_RESPONSE: ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); if (ret < 0) goto err; break; default: pr_err("Unknown Opcode: 0x%02x ITT:" " 0x%08x, i_state: %d on CID: %hu\n", cmd->iscsi_opcode, cmd->init_task_tag, state, conn->cid); goto err; } return 0; err: return -1; } EXPORT_SYMBOL(iscsit_immediate_queue); static int iscsit_handle_immediate_queue(struct iscsi_conn *conn) { struct iscsit_transport *t = conn->conn_transport; struct iscsi_queue_req *qr; struct iscsi_cmd *cmd; u8 state; int ret; while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { atomic_set(&conn->check_immediate_queue, 0); cmd = qr->cmd; state = qr->state; kmem_cache_free(lio_qr_cache, qr); ret = t->iscsit_immediate_queue(conn, cmd, state); if (ret < 0) return ret; } return 0; } int iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) { int ret; check_rsp_state: switch (state) { case ISTATE_SEND_DATAIN: ret = iscsit_send_datain(cmd, conn); if (ret < 0) goto err; else if (!ret) /* more drs */ goto check_rsp_state; else if (ret == 1) { /* all done */ spin_lock_bh(&cmd->istate_lock); cmd->i_state = ISTATE_SENT_STATUS; spin_unlock_bh(&cmd->istate_lock); if (atomic_read(&conn->check_immediate_queue)) return 1; return 0; } else if (ret == 2) { /* Still must send status, SCF_TRANSPORT_TASK_SENSE was set */ spin_lock_bh(&cmd->istate_lock); cmd->i_state = ISTATE_SEND_STATUS; spin_unlock_bh(&cmd->istate_lock); state = ISTATE_SEND_STATUS; goto check_rsp_state; } break; case ISTATE_SEND_STATUS: case ISTATE_SEND_STATUS_RECOVERY: ret = iscsit_send_response(cmd, conn); break; case ISTATE_SEND_LOGOUTRSP: ret = iscsit_send_logout(cmd, conn); break; case ISTATE_SEND_ASYNCMSG: ret = iscsit_send_conn_drop_async_message( cmd, conn); break; case ISTATE_SEND_NOPIN: ret = iscsit_send_nopin(cmd, conn); break; case ISTATE_SEND_REJECT: ret = iscsit_send_reject(cmd, conn); break; case ISTATE_SEND_TASKMGTRSP: ret = iscsit_send_task_mgt_rsp(cmd, conn); if (ret != 0) break; ret = iscsit_tmr_post_handler(cmd, conn); if (ret != 0) iscsit_fall_back_to_erl0(conn->sess); break; case ISTATE_SEND_TEXTRSP: ret = iscsit_send_text_rsp(cmd, conn); break; default: pr_err("Unknown Opcode: 0x%02x ITT:" " 0x%08x, i_state: %d on CID: %hu\n", cmd->iscsi_opcode, cmd->init_task_tag, state, conn->cid); goto err; } if (ret < 0) goto err; switch (state) { case ISTATE_SEND_LOGOUTRSP: if (!iscsit_logout_post_handler(cmd, conn)) return -ECONNRESET; /* fall through */ case ISTATE_SEND_STATUS: case ISTATE_SEND_ASYNCMSG: case ISTATE_SEND_NOPIN: case ISTATE_SEND_STATUS_RECOVERY: case ISTATE_SEND_TEXTRSP: case ISTATE_SEND_TASKMGTRSP: case ISTATE_SEND_REJECT: spin_lock_bh(&cmd->istate_lock); cmd->i_state = ISTATE_SENT_STATUS; spin_unlock_bh(&cmd->istate_lock); break; default: pr_err("Unknown Opcode: 0x%02x ITT:" " 0x%08x, i_state: %d on CID: %hu\n", cmd->iscsi_opcode, cmd->init_task_tag, cmd->i_state, conn->cid); goto err; } if (atomic_read(&conn->check_immediate_queue)) return 1; return 0; err: return -1; } EXPORT_SYMBOL(iscsit_response_queue); static int iscsit_handle_response_queue(struct iscsi_conn *conn) { struct iscsit_transport *t = conn->conn_transport; struct iscsi_queue_req *qr; struct iscsi_cmd *cmd; u8 state; int ret; while ((qr = iscsit_get_cmd_from_response_queue(conn))) { cmd = qr->cmd; state = qr->state; kmem_cache_free(lio_qr_cache, qr); ret = t->iscsit_response_queue(conn, cmd, state); if (ret == 1 || ret < 0) return ret; } return 0; } int iscsi_target_tx_thread(void *arg) { int ret = 0; struct iscsi_conn *conn = arg; bool conn_freed = false; /* * Allow ourselves to be interrupted by SIGINT so that a * connection recovery / failure event can be triggered externally. */ allow_signal(SIGINT); while (!kthread_should_stop()) { /* * Ensure that both TX and RX per connection kthreads * are scheduled to run on the same CPU. */ iscsit_thread_check_cpumask(conn, current, 1); wait_event_interruptible(conn->queues_wq, !iscsit_conn_all_queues_empty(conn)); if (signal_pending(current)) goto transport_err; get_immediate: ret = iscsit_handle_immediate_queue(conn); if (ret < 0) goto transport_err; ret = iscsit_handle_response_queue(conn); if (ret == 1) { goto get_immediate; } else if (ret == -ECONNRESET) { conn_freed = true; goto out; } else if (ret < 0) { goto transport_err; } } transport_err: /* * Avoid the normal connection failure code-path if this connection * is still within LOGIN mode, and iscsi_np process context is * responsible for cleaning up the early connection failure. */ if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN) iscsit_take_action_for_connection_exit(conn, &conn_freed); out: if (!conn_freed) { while (!kthread_should_stop()) { msleep(100); } } return 0; } static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf) { struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; struct iscsi_cmd *cmd; int ret = 0; switch (hdr->opcode & ISCSI_OPCODE_MASK) { case ISCSI_OP_SCSI_CMD: cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); if (!cmd) goto reject; ret = iscsit_handle_scsi_cmd(conn, cmd, buf); break; case ISCSI_OP_SCSI_DATA_OUT: ret = iscsit_handle_data_out(conn, buf); break; case ISCSI_OP_NOOP_OUT: cmd = NULL; if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); if (!cmd) goto reject; } ret = iscsit_handle_nop_out(conn, cmd, buf); break; case ISCSI_OP_SCSI_TMFUNC: cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); if (!cmd) goto reject; ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); break; case ISCSI_OP_TEXT: if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); if (!cmd) goto reject; } else { cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); if (!cmd) goto reject; } ret = iscsit_handle_text_cmd(conn, cmd, buf); break; case ISCSI_OP_LOGOUT: cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); if (!cmd) goto reject; ret = iscsit_handle_logout_cmd(conn, cmd, buf); if (ret > 0) wait_for_completion_timeout(&conn->conn_logout_comp, SECONDS_FOR_LOGOUT_COMP * HZ); break; case ISCSI_OP_SNACK: ret = iscsit_handle_snack(conn, buf); break; default: pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); if (!conn->sess->sess_ops->ErrorRecoveryLevel) { pr_err("Cannot recover from unknown" " opcode while ERL=0, closing iSCSI connection.\n"); return -1; } pr_err("Unable to recover from unknown opcode while OFMarker=No," " closing iSCSI connection.\n"); ret = -1; break; } return ret; reject: return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); } static bool iscsi_target_check_conn_state(struct iscsi_conn *conn) { bool ret; spin_lock_bh(&conn->state_lock); ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN); spin_unlock_bh(&conn->state_lock); return ret; } static void iscsit_get_rx_pdu(struct iscsi_conn *conn) { int ret; u8 *buffer, opcode; u32 checksum = 0, digest = 0; struct kvec iov; buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL); if (!buffer) return; while (!kthread_should_stop()) { /* * Ensure that both TX and RX per connection kthreads * are scheduled to run on the same CPU. */ iscsit_thread_check_cpumask(conn, current, 0); memset(&iov, 0, sizeof(struct kvec)); iov.iov_base = buffer; iov.iov_len = ISCSI_HDR_LEN; ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); if (ret != ISCSI_HDR_LEN) { iscsit_rx_thread_wait_for_tcp(conn); break; } if (conn->conn_ops->HeaderDigest) { iov.iov_base = &digest; iov.iov_len = ISCSI_CRC_LEN; ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); if (ret != ISCSI_CRC_LEN) { iscsit_rx_thread_wait_for_tcp(conn); break; } iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer, ISCSI_HDR_LEN, 0, NULL, &checksum); if (digest != checksum) { pr_err("HeaderDigest CRC32C failed," " received 0x%08x, computed 0x%08x\n", digest, checksum); /* * Set the PDU to 0xff so it will intentionally * hit default in the switch below. */ memset(buffer, 0xff, ISCSI_HDR_LEN); atomic_long_inc(&conn->sess->conn_digest_errors); } else { pr_debug("Got HeaderDigest CRC32C" " 0x%08x\n", checksum); } } if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) break; opcode = buffer[0] & ISCSI_OPCODE_MASK; if (conn->sess->sess_ops->SessionType && ((!(opcode & ISCSI_OP_TEXT)) || (!(opcode & ISCSI_OP_LOGOUT)))) { pr_err("Received illegal iSCSI Opcode: 0x%02x" " while in Discovery Session, rejecting.\n", opcode); iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buffer); break; } ret = iscsi_target_rx_opcode(conn, buffer); if (ret < 0) break; } kfree(buffer); } int iscsi_target_rx_thread(void *arg) { int rc; struct iscsi_conn *conn = arg; bool conn_freed = false; /* * Allow ourselves to be interrupted by SIGINT so that a * connection recovery / failure event can be triggered externally. */ allow_signal(SIGINT); /* * Wait for iscsi_post_login_handler() to complete before allowing * incoming iscsi/tcp socket I/O, and/or failing the connection. */ rc = wait_for_completion_interruptible(&conn->rx_login_comp); if (rc < 0 || iscsi_target_check_conn_state(conn)) goto out; if (!conn->conn_transport->iscsit_get_rx_pdu) return 0; conn->conn_transport->iscsit_get_rx_pdu(conn); if (!signal_pending(current)) atomic_set(&conn->transport_failed, 1); iscsit_take_action_for_connection_exit(conn, &conn_freed); out: if (!conn_freed) { while (!kthread_should_stop()) { msleep(100); } } return 0; } static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) { LIST_HEAD(tmp_list); struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; struct iscsi_session *sess = conn->sess; /* * We expect this function to only ever be called from either RX or TX * thread context via iscsit_close_connection() once the other context * has been reset -> returned sleeping pre-handler state. */ spin_lock_bh(&conn->cmd_lock); list_splice_init(&conn->conn_cmd_list, &tmp_list); list_for_each_entry(cmd, &tmp_list, i_conn_node) { struct se_cmd *se_cmd = &cmd->se_cmd; if (se_cmd->se_tfo != NULL) { spin_lock_irq(&se_cmd->t_state_lock); se_cmd->transport_state |= CMD_T_FABRIC_STOP; spin_unlock_irq(&se_cmd->t_state_lock); } } spin_unlock_bh(&conn->cmd_lock); list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { list_del_init(&cmd->i_conn_node); iscsit_increment_maxcmdsn(cmd, sess); iscsit_free_cmd(cmd, true); } } static void iscsit_stop_timers_for_cmds( struct iscsi_conn *conn) { struct iscsi_cmd *cmd; spin_lock_bh(&conn->cmd_lock); list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { if (cmd->data_direction == DMA_TO_DEVICE) iscsit_stop_dataout_timer(cmd); } spin_unlock_bh(&conn->cmd_lock); } int iscsit_close_connection( struct iscsi_conn *conn) { int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); struct iscsi_session *sess = conn->sess; pr_debug("Closing iSCSI connection CID %hu on SID:" " %u\n", conn->cid, sess->sid); /* * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD * case just in case the RX Thread in iscsi_target_rx_opcode() is * sleeping and the logout response never got sent because the * connection failed. * * However for iser-target, isert_wait4logout() is using conn_logout_comp * to signal logout response TX interrupt completion. Go ahead and skip * this for iser since isert_rx_opcode() does not wait on logout failure, * and to avoid iscsi_conn pointer dereference in iser-target code. */ if (!conn->conn_transport->rdma_shutdown) complete(&conn->conn_logout_comp); if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) { if (conn->tx_thread && cmpxchg(&conn->tx_thread_active, true, false)) { send_sig(SIGINT, conn->tx_thread, 1); kthread_stop(conn->tx_thread); } } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) { if (conn->rx_thread && cmpxchg(&conn->rx_thread_active, true, false)) { send_sig(SIGINT, conn->rx_thread, 1); kthread_stop(conn->rx_thread); } } spin_lock(&iscsit_global->ts_bitmap_lock); bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, get_order(1)); spin_unlock(&iscsit_global->ts_bitmap_lock); iscsit_stop_timers_for_cmds(conn); iscsit_stop_nopin_response_timer(conn); iscsit_stop_nopin_timer(conn); if (conn->conn_transport->iscsit_wait_conn) conn->conn_transport->iscsit_wait_conn(conn); /* * During Connection recovery drop unacknowledged out of order * commands for this connection, and prepare the other commands * for reallegiance. * * During normal operation clear the out of order commands (but * do not free the struct iscsi_ooo_cmdsn's) and release all * struct iscsi_cmds. */ if (atomic_read(&conn->connection_recovery)) { iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); iscsit_prepare_cmds_for_reallegiance(conn); } else { iscsit_clear_ooo_cmdsns_for_conn(conn); iscsit_release_commands_from_conn(conn); } iscsit_free_queue_reqs_for_conn(conn); /* * Handle decrementing session or connection usage count if * a logout response was not able to be sent because the * connection failed. Fall back to Session Recovery here. */ if (atomic_read(&conn->conn_logout_remove)) { if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { iscsit_dec_conn_usage_count(conn); iscsit_dec_session_usage_count(sess); } if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) iscsit_dec_conn_usage_count(conn); atomic_set(&conn->conn_logout_remove, 0); atomic_set(&sess->session_reinstatement, 0); atomic_set(&sess->session_fall_back_to_erl0, 1); } spin_lock_bh(&sess->conn_lock); list_del(&conn->conn_list); /* * Attempt to let the Initiator know this connection failed by * sending an Connection Dropped Async Message on another * active connection. */ if (atomic_read(&conn->connection_recovery)) iscsit_build_conn_drop_async_message(conn); spin_unlock_bh(&sess->conn_lock); /* * If connection reinstatement is being performed on this connection, * up the connection reinstatement semaphore that is being blocked on * in iscsit_cause_connection_reinstatement(). */ spin_lock_bh(&conn->state_lock); if (atomic_read(&conn->sleep_on_conn_wait_comp)) { spin_unlock_bh(&conn->state_lock); complete(&conn->conn_wait_comp); wait_for_completion(&conn->conn_post_wait_comp); spin_lock_bh(&conn->state_lock); } /* * If connection reinstatement is being performed on this connection * by receiving a REMOVECONNFORRECOVERY logout request, up the * connection wait rcfr semaphore that is being blocked on * an iscsit_connection_reinstatement_rcfr(). */ if (atomic_read(&conn->connection_wait_rcfr)) { spin_unlock_bh(&conn->state_lock); complete(&conn->conn_wait_rcfr_comp); wait_for_completion(&conn->conn_post_wait_comp); spin_lock_bh(&conn->state_lock); } atomic_set(&conn->connection_reinstatement, 1); spin_unlock_bh(&conn->state_lock); /* * If any other processes are accessing this connection pointer we * must wait until they have completed. */ iscsit_check_conn_usage_count(conn); ahash_request_free(conn->conn_tx_hash); if (conn->conn_rx_hash) { struct crypto_ahash *tfm; tfm = crypto_ahash_reqtfm(conn->conn_rx_hash); ahash_request_free(conn->conn_rx_hash); crypto_free_ahash(tfm); } if (conn->sock) sock_release(conn->sock); if (conn->conn_transport->iscsit_free_conn) conn->conn_transport->iscsit_free_conn(conn); pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); conn->conn_state = TARG_CONN_STATE_FREE; iscsit_free_conn(conn); spin_lock_bh(&sess->conn_lock); atomic_dec(&sess->nconn); pr_debug("Decremented iSCSI connection count to %hu from node:" " %s\n", atomic_read(&sess->nconn), sess->sess_ops->InitiatorName); /* * Make sure that if one connection fails in an non ERL=2 iSCSI * Session that they all fail. */ if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && !atomic_read(&sess->session_logout)) atomic_set(&sess->session_fall_back_to_erl0, 1); /* * If this was not the last connection in the session, and we are * performing session reinstatement or falling back to ERL=0, call * iscsit_stop_session() without sleeping to shutdown the other * active connections. */ if (atomic_read(&sess->nconn)) { if (!atomic_read(&sess->session_reinstatement) && !atomic_read(&sess->session_fall_back_to_erl0)) { spin_unlock_bh(&sess->conn_lock); return 0; } if (!atomic_read(&sess->session_stop_active)) { atomic_set(&sess->session_stop_active, 1); spin_unlock_bh(&sess->conn_lock); iscsit_stop_session(sess, 0, 0); return 0; } spin_unlock_bh(&sess->conn_lock); return 0; } /* * If this was the last connection in the session and one of the * following is occurring: * * Session Reinstatement is not being performed, and are falling back * to ERL=0 call iscsit_close_session(). * * Session Logout was requested. iscsit_close_session() will be called * elsewhere. * * Session Continuation is not being performed, start the Time2Retain * handler and check if sleep_on_sess_wait_sem is active. */ if (!atomic_read(&sess->session_reinstatement) && atomic_read(&sess->session_fall_back_to_erl0)) { spin_unlock_bh(&sess->conn_lock); complete_all(&sess->session_wait_comp); iscsit_close_session(sess); return 0; } else if (atomic_read(&sess->session_logout)) { pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); sess->session_state = TARG_SESS_STATE_FREE; if (atomic_read(&sess->session_close)) { spin_unlock_bh(&sess->conn_lock); complete_all(&sess->session_wait_comp); iscsit_close_session(sess); } else { spin_unlock_bh(&sess->conn_lock); } return 0; } else { pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); sess->session_state = TARG_SESS_STATE_FAILED; if (!atomic_read(&sess->session_continuation)) iscsit_start_time2retain_handler(sess); if (atomic_read(&sess->session_close)) { spin_unlock_bh(&sess->conn_lock); complete_all(&sess->session_wait_comp); iscsit_close_session(sess); } else { spin_unlock_bh(&sess->conn_lock); } return 0; } } /* * If the iSCSI Session for the iSCSI Initiator Node exists, * forcefully shutdown the iSCSI NEXUS. */ int iscsit_close_session(struct iscsi_session *sess) { struct iscsi_portal_group *tpg = sess->tpg; struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; if (atomic_read(&sess->nconn)) { pr_err("%d connection(s) still exist for iSCSI session" " to %s\n", atomic_read(&sess->nconn), sess->sess_ops->InitiatorName); BUG(); } spin_lock_bh(&se_tpg->session_lock); atomic_set(&sess->session_logout, 1); atomic_set(&sess->session_reinstatement, 1); iscsit_stop_time2retain_timer(sess); spin_unlock_bh(&se_tpg->session_lock); /* * transport_deregister_session_configfs() will clear the * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context * can be setting it again with __transport_register_session() in * iscsi_post_login_handler() again after the iscsit_stop_session() * completes in iscsi_np context. */ transport_deregister_session_configfs(sess->se_sess); /* * If any other processes are accessing this session pointer we must * wait until they have completed. If we are in an interrupt (the * time2retain handler) and contain and active session usage count we * restart the timer and exit. */ if (!in_interrupt()) { iscsit_check_session_usage_count(sess); } else { if (iscsit_check_session_usage_count(sess) == 2) { atomic_set(&sess->session_logout, 0); iscsit_start_time2retain_handler(sess); return 0; } } transport_deregister_session(sess->se_sess); if (sess->sess_ops->ErrorRecoveryLevel == 2) iscsit_free_connection_recovery_entries(sess); iscsit_free_all_ooo_cmdsns(sess); spin_lock_bh(&se_tpg->session_lock); pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); sess->session_state = TARG_SESS_STATE_FREE; pr_debug("Released iSCSI session from node: %s\n", sess->sess_ops->InitiatorName); tpg->nsessions--; if (tpg->tpg_tiqn) tpg->tpg_tiqn->tiqn_nsessions--; pr_debug("Decremented number of active iSCSI Sessions on" " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); ida_free(&sess_ida, sess->session_index); kfree(sess->sess_ops); sess->sess_ops = NULL; spin_unlock_bh(&se_tpg->session_lock); kfree(sess); return 0; } static void iscsit_logout_post_handler_closesession( struct iscsi_conn *conn) { struct iscsi_session *sess = conn->sess; int sleep = 1; /* * Traditional iscsi/tcp will invoke this logic from TX thread * context during session logout, so clear tx_thread_active and * sleep if iscsit_close_connection() has not already occured. * * Since iser-target invokes this logic from it's own workqueue, * always sleep waiting for RX/TX thread shutdown to complete * within iscsit_close_connection(). */ if (!conn->conn_transport->rdma_shutdown) { sleep = cmpxchg(&conn->tx_thread_active, true, false); if (!sleep) return; } atomic_set(&conn->conn_logout_remove, 0); complete(&conn->conn_logout_comp); iscsit_dec_conn_usage_count(conn); atomic_set(&sess->session_close, 1); iscsit_stop_session(sess, sleep, sleep); iscsit_dec_session_usage_count(sess); } static void iscsit_logout_post_handler_samecid( struct iscsi_conn *conn) { int sleep = 1; if (!conn->conn_transport->rdma_shutdown) { sleep = cmpxchg(&conn->tx_thread_active, true, false); if (!sleep) return; } atomic_set(&conn->conn_logout_remove, 0); complete(&conn->conn_logout_comp); iscsit_cause_connection_reinstatement(conn, sleep); iscsit_dec_conn_usage_count(conn); } static void iscsit_logout_post_handler_diffcid( struct iscsi_conn *conn, u16 cid) { struct iscsi_conn *l_conn; struct iscsi_session *sess = conn->sess; bool conn_found = false; if (!sess) return; spin_lock_bh(&sess->conn_lock); list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { if (l_conn->cid == cid) { iscsit_inc_conn_usage_count(l_conn); conn_found = true; break; } } spin_unlock_bh(&sess->conn_lock); if (!conn_found) return; if (l_conn->sock) l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); spin_lock_bh(&l_conn->state_lock); pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; spin_unlock_bh(&l_conn->state_lock); iscsit_cause_connection_reinstatement(l_conn, 1); iscsit_dec_conn_usage_count(l_conn); } /* * Return of 0 causes the TX thread to restart. */ int iscsit_logout_post_handler( struct iscsi_cmd *cmd, struct iscsi_conn *conn) { int ret = 0; switch (cmd->logout_reason) { case ISCSI_LOGOUT_REASON_CLOSE_SESSION: switch (cmd->logout_response) { case ISCSI_LOGOUT_SUCCESS: case ISCSI_LOGOUT_CLEANUP_FAILED: default: iscsit_logout_post_handler_closesession(conn); break; } ret = 0; break; case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: if (conn->cid == cmd->logout_cid) { switch (cmd->logout_response) { case ISCSI_LOGOUT_SUCCESS: case ISCSI_LOGOUT_CLEANUP_FAILED: default: iscsit_logout_post_handler_samecid(conn); break; } ret = 0; } else { switch (cmd->logout_response) { case ISCSI_LOGOUT_SUCCESS: iscsit_logout_post_handler_diffcid(conn, cmd->logout_cid); break; case ISCSI_LOGOUT_CID_NOT_FOUND: case ISCSI_LOGOUT_CLEANUP_FAILED: default: break; } ret = 1; } break; case ISCSI_LOGOUT_REASON_RECOVERY: switch (cmd->logout_response) { case ISCSI_LOGOUT_SUCCESS: case ISCSI_LOGOUT_CID_NOT_FOUND: case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: case ISCSI_LOGOUT_CLEANUP_FAILED: default: break; } ret = 1; break; default: break; } return ret; } EXPORT_SYMBOL(iscsit_logout_post_handler); void iscsit_fail_session(struct iscsi_session *sess) { struct iscsi_conn *conn; spin_lock_bh(&sess->conn_lock); list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; } spin_unlock_bh(&sess->conn_lock); pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); sess->session_state = TARG_SESS_STATE_FAILED; } void iscsit_stop_session( struct iscsi_session *sess, int session_sleep, int connection_sleep) { u16 conn_count = atomic_read(&sess->nconn); struct iscsi_conn *conn, *conn_tmp = NULL; int is_last; spin_lock_bh(&sess->conn_lock); if (connection_sleep) { list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, conn_list) { if (conn_count == 0) break; if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { is_last = 1; } else { iscsit_inc_conn_usage_count(conn_tmp); is_last = 0; } iscsit_inc_conn_usage_count(conn); spin_unlock_bh(&sess->conn_lock); iscsit_cause_connection_reinstatement(conn, 1); spin_lock_bh(&sess->conn_lock); iscsit_dec_conn_usage_count(conn); if (is_last == 0) iscsit_dec_conn_usage_count(conn_tmp); conn_count--; } } else { list_for_each_entry(conn, &sess->sess_conn_list, conn_list) iscsit_cause_connection_reinstatement(conn, 0); } if (session_sleep && atomic_read(&sess->nconn)) { spin_unlock_bh(&sess->conn_lock); wait_for_completion(&sess->session_wait_comp); } else spin_unlock_bh(&sess->conn_lock); } int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) { struct iscsi_session *sess; struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; struct se_session *se_sess, *se_sess_tmp; LIST_HEAD(free_list); int session_count = 0; spin_lock_bh(&se_tpg->session_lock); if (tpg->nsessions && !force) { spin_unlock_bh(&se_tpg->session_lock); return -1; } list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, sess_list) { sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; spin_lock(&sess->conn_lock); if (atomic_read(&sess->session_fall_back_to_erl0) || atomic_read(&sess->session_logout) || atomic_read(&sess->session_close) || (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { spin_unlock(&sess->conn_lock); continue; } iscsit_inc_session_usage_count(sess); atomic_set(&sess->session_reinstatement, 1); atomic_set(&sess->session_fall_back_to_erl0, 1); atomic_set(&sess->session_close, 1); spin_unlock(&sess->conn_lock); list_move_tail(&se_sess->sess_list, &free_list); } spin_unlock_bh(&se_tpg->session_lock); list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) { sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; list_del_init(&se_sess->sess_list); iscsit_stop_session(sess, 1, 1); iscsit_dec_session_usage_count(sess); session_count++; } pr_debug("Released %d iSCSI Session(s) from Target Portal" " Group: %hu\n", session_count, tpg->tpgt); return 0; } MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); MODULE_VERSION("4.1.x"); MODULE_AUTHOR("nab@Linux-iSCSI.org"); MODULE_LICENSE("GPL"); module_init(iscsi_target_init_module); module_exit(iscsi_target_cleanup_module);
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