/******************************************************************************* * This file contains the login functions used by the iSCSI Target driver. * * (c) Copyright 2007-2013 Datera, Inc. * * Author: Nicholas A. Bellinger * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. ******************************************************************************/ #include #include #include #include #include #include #include #include #include #include "iscsi_target_device.h" #include "iscsi_target_nego.h" #include "iscsi_target_erl0.h" #include "iscsi_target_erl2.h" #include "iscsi_target_login.h" #include "iscsi_target_tpg.h" #include "iscsi_target_util.h" #include "iscsi_target.h" #include "iscsi_target_parameters.h" #include static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn) { struct iscsi_login *login; login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL); if (!login) { pr_err("Unable to allocate memory for struct iscsi_login.\n"); return NULL; } conn->login = login; login->conn = conn; login->first_request = 1; login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL); if (!login->req_buf) { pr_err("Unable to allocate memory for response buffer.\n"); goto out_login; } login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL); if (!login->rsp_buf) { pr_err("Unable to allocate memory for request buffer.\n"); goto out_req_buf; } conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL); if (!conn->conn_ops) { pr_err("Unable to allocate memory for" " struct iscsi_conn_ops.\n"); goto out_rsp_buf; } init_waitqueue_head(&conn->queues_wq); INIT_LIST_HEAD(&conn->conn_list); INIT_LIST_HEAD(&conn->conn_cmd_list); INIT_LIST_HEAD(&conn->immed_queue_list); INIT_LIST_HEAD(&conn->response_queue_list); init_completion(&conn->conn_post_wait_comp); init_completion(&conn->conn_wait_comp); init_completion(&conn->conn_wait_rcfr_comp); init_completion(&conn->conn_waiting_on_uc_comp); init_completion(&conn->conn_logout_comp); init_completion(&conn->rx_half_close_comp); init_completion(&conn->tx_half_close_comp); spin_lock_init(&conn->cmd_lock); spin_lock_init(&conn->conn_usage_lock); spin_lock_init(&conn->immed_queue_lock); spin_lock_init(&conn->nopin_timer_lock); spin_lock_init(&conn->response_queue_lock); spin_lock_init(&conn->state_lock); if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) { pr_err("Unable to allocate conn->conn_cpumask\n"); goto out_conn_ops; } conn->conn_login = login; return login; out_conn_ops: kfree(conn->conn_ops); out_rsp_buf: kfree(login->rsp_buf); out_req_buf: kfree(login->req_buf); out_login: kfree(login); return NULL; } /* * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel */ int iscsi_login_setup_crypto(struct iscsi_conn *conn) { /* * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback * to software 1x8 byte slicing from crc32c.ko */ conn->conn_rx_hash.flags = 0; conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0, CRYPTO_ALG_ASYNC); if (IS_ERR(conn->conn_rx_hash.tfm)) { pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n"); return -ENOMEM; } conn->conn_tx_hash.flags = 0; conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0, CRYPTO_ALG_ASYNC); if (IS_ERR(conn->conn_tx_hash.tfm)) { pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n"); crypto_free_hash(conn->conn_rx_hash.tfm); return -ENOMEM; } return 0; } static int iscsi_login_check_initiator_version( struct iscsi_conn *conn, u8 version_max, u8 version_min) { if ((version_max != 0x00) || (version_min != 0x00)) { pr_err("Unsupported iSCSI IETF Pre-RFC Revision," " version Min/Max 0x%02x/0x%02x, rejecting login.\n", version_min, version_max); iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, ISCSI_LOGIN_STATUS_NO_VERSION); return -1; } return 0; } int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn) { int sessiontype; struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL; struct iscsi_portal_group *tpg = conn->tpg; struct iscsi_session *sess = NULL, *sess_p = NULL; struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; struct se_session *se_sess, *se_sess_tmp; initiatorname_param = iscsi_find_param_from_key( INITIATORNAME, conn->param_list); sessiontype_param = iscsi_find_param_from_key( SESSIONTYPE, conn->param_list); if (!initiatorname_param || !sessiontype_param) { iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, ISCSI_LOGIN_STATUS_MISSING_FIELDS); return -1; } sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0; spin_lock_bh(&se_tpg->session_lock); list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, sess_list) { sess_p = se_sess->fabric_sess_ptr; spin_lock(&sess_p->conn_lock); if (atomic_read(&sess_p->session_fall_back_to_erl0) || atomic_read(&sess_p->session_logout) || (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { spin_unlock(&sess_p->conn_lock); continue; } if (!memcmp(sess_p->isid, conn->sess->isid, 6) && (!strcmp(sess_p->sess_ops->InitiatorName, initiatorname_param->value) && (sess_p->sess_ops->SessionType == sessiontype))) { atomic_set(&sess_p->session_reinstatement, 1); spin_unlock(&sess_p->conn_lock); iscsit_inc_session_usage_count(sess_p); iscsit_stop_time2retain_timer(sess_p); sess = sess_p; break; } spin_unlock(&sess_p->conn_lock); } spin_unlock_bh(&se_tpg->session_lock); /* * If the Time2Retain handler has expired, the session is already gone. */ if (!sess) return 0; pr_debug("%s iSCSI Session SID %u is still active for %s," " preforming session reinstatement.\n", (sessiontype) ? "Discovery" : "Normal", sess->sid, sess->sess_ops->InitiatorName); spin_lock_bh(&sess->conn_lock); if (sess->session_state == TARG_SESS_STATE_FAILED) { spin_unlock_bh(&sess->conn_lock); iscsit_dec_session_usage_count(sess); target_put_session(sess->se_sess); return 0; } spin_unlock_bh(&sess->conn_lock); iscsit_stop_session(sess, 1, 1); iscsit_dec_session_usage_count(sess); target_put_session(sess->se_sess); return 0; } static void iscsi_login_set_conn_values( struct iscsi_session *sess, struct iscsi_conn *conn, __be16 cid) { conn->sess = sess; conn->cid = be16_to_cpu(cid); /* * Generate a random Status sequence number (statsn) for the new * iSCSI connection. */ get_random_bytes(&conn->stat_sn, sizeof(u32)); mutex_lock(&auth_id_lock); conn->auth_id = iscsit_global->auth_id++; mutex_unlock(&auth_id_lock); } static __printf(2, 3) int iscsi_change_param_sprintf( struct iscsi_conn *conn, const char *fmt, ...) { va_list args; unsigned char buf[64]; memset(buf, 0, sizeof buf); va_start(args, fmt); vsnprintf(buf, sizeof buf, fmt, args); va_end(args); if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) { iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, ISCSI_LOGIN_STATUS_NO_RESOURCES); return -1; } return 0; } /* * This is the leading connection of a new session, * or session reinstatement. */ static int iscsi_login_zero_tsih_s1( struct iscsi_conn *conn, unsigned char *buf) { struct iscsi_session *sess = NULL; struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf; int ret; sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL); if (!sess) { iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, ISCSI_LOGIN_STATUS_NO_RESOURCES); pr_err("Could not allocate memory for session\n"); return -ENOMEM; } iscsi_login_set_conn_values(sess, conn, pdu->cid); sess->init_task_tag = pdu->itt; memcpy(&sess->isid, pdu->isid, 6); sess->exp_cmd_sn = be32_to_cpu(pdu->cmdsn); INIT_LIST_HEAD(&sess->sess_conn_list); INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list); INIT_LIST_HEAD(&sess->cr_active_list); INIT_LIST_HEAD(&sess->cr_inactive_list); init_completion(&sess->async_msg_comp); init_completion(&sess->reinstatement_comp); init_completion(&sess->session_wait_comp); init_completion(&sess->session_waiting_on_uc_comp); mutex_init(&sess->cmdsn_mutex); spin_lock_init(&sess->conn_lock); spin_lock_init(&sess->cr_a_lock); spin_lock_init(&sess->cr_i_lock); spin_lock_init(&sess->session_usage_lock); spin_lock_init(&sess->ttt_lock); idr_preload(GFP_KERNEL); spin_lock_bh(&sess_idr_lock); ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT); if (ret >= 0) sess->session_index = ret; spin_unlock_bh(&sess_idr_lock); idr_preload_end(); if (ret < 0) { pr_err("idr_alloc() for sess_idr failed\n"); iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, ISCSI_LOGIN_STATUS_NO_RESOURCES); kfree(sess); return -ENOMEM; } sess->creation_time = get_jiffies_64(); /* * The FFP CmdSN window values will be allocated from the TPG's * Initiator Node's ACL once the login has been successfully completed. */ atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn)); sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL); if (!sess->sess_ops) { iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, ISCSI_LOGIN_STATUS_NO_RESOURCES); pr_err("Unable to allocate memory for" " struct iscsi_sess_ops.\n"); kfree(sess); return -ENOMEM; } sess->se_sess = transport_init_session(TARGET_PROT_NORMAL); if (IS_ERR(sess->se_sess)) { iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, ISCSI_LOGIN_STATUS_NO_RESOURCES); kfree(sess->sess_ops); kfree(sess); return -ENOMEM; } return 0; } static int iscsi_login_zero_tsih_s2( struct iscsi_conn *conn) { struct iscsi_node_attrib *na; struct iscsi_session *sess = conn->sess; bool iser = false; sess->tpg = conn->tpg; /* * Assign a new TPG Session Handle. Note this is protected with * struct iscsi_portal_group->np_login_sem from iscsit_access_np(). */ sess->tsih = ++sess->tpg->ntsih; if (!sess->tsih) sess->tsih = ++sess->tpg->ntsih; /* * Create the default params from user defined values.. */ if (iscsi_copy_param_list(&conn->param_list, conn->tpg->param_list, 1) < 0) { iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, ISCSI_LOGIN_STATUS_NO_RESOURCES); return -1; } if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) iser = true; iscsi_set_keys_to_negotiate(conn->param_list, iser); if (sess->sess_ops->SessionType) return iscsi_set_keys_irrelevant_for_discovery( conn->param_list); na = iscsit_tpg_get_node_attrib(sess); /* * Need to send TargetPortalGroupTag back in first login response * on any iSCSI connection where the Initiator provides TargetName. * See 5.3.1. Login Phase Start * * In our case, we have already located the struct iscsi_tiqn at this point. */ if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt)) return -1; /* * Workaround for Initiators that have broken connection recovery logic. * * "We would really like to get rid of this." Linux-iSCSI.org team */ if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl)) return -1; /* * Set RDMAExtensions=Yes by default for iSER enabled network portals */ if (iser) { struct iscsi_param *param; unsigned long mrdsl, off; int rc; if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes")) return -1; /* * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for * Immediate Data + Unsolicitied Data-OUT if necessary.. */ param = iscsi_find_param_from_key("MaxRecvDataSegmentLength", conn->param_list); if (!param) { iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, ISCSI_LOGIN_STATUS_NO_RESOURCES); return -1; } rc = kstrtoul(param->value, 0, &mrdsl); if (rc < 0) { iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, ISCSI_LOGIN_STATUS_NO_RESOURCES); return -1; } off = mrdsl % PAGE_SIZE; if (!off) goto check_prot; if (mrdsl < PAGE_SIZE) mrdsl = PAGE_SIZE; else mrdsl -= off; pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down" " to PAGE_SIZE\n", mrdsl); if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl)) return -1; /* * ISER currently requires that ImmediateData + Unsolicited * Data be disabled when protection / signature MRs are enabled. */ check_prot: if (sess->se_sess->sup_prot_ops & (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_INSERT)) { if (iscsi_change_param_sprintf(conn, "ImmediateData=No")) return -1; if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes")) return -1; pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for" " T10-PI enabled ISER session\n"); } } return 0; } static int iscsi_login_non_zero_tsih_s1( struct iscsi_conn *conn, unsigned char *buf) { struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf; iscsi_login_set_conn_values(NULL, conn, pdu->cid); return 0; } /* * Add a new connection to an existing session. */ static int iscsi_login_non_zero_tsih_s2( struct iscsi_conn *conn, unsigned char *buf) { struct iscsi_portal_group *tpg = conn->tpg; struct iscsi_session *sess = NULL, *sess_p = NULL; struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; struct se_session *se_sess, *se_sess_tmp; struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf; bool iser = false; spin_lock_bh(&se_tpg->session_lock); list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, sess_list) { sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr; if (atomic_read(&sess_p->session_fall_back_to_erl0) || atomic_read(&sess_p->session_logout) || (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) continue; if (!memcmp(sess_p->isid, pdu->isid, 6) && (sess_p->tsih == be16_to_cpu(pdu->tsih))) { iscsit_inc_session_usage_count(sess_p); iscsit_stop_time2retain_timer(sess_p); sess = sess_p; break; } } spin_unlock_bh(&se_tpg->session_lock); /* * If the Time2Retain handler has expired, the session is already gone. */ if (!sess) { pr_err("Initiator attempting to add a connection to" " a non-existent session, rejecting iSCSI Login.\n"); iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, ISCSI_LOGIN_STATUS_NO_SESSION); return -1; } /* * Stop the Time2Retain timer if this is a failed session, we restart * the timer if the login is not successful. */ spin_lock_bh(&sess->conn_lock); if (sess->session_state == TARG_SESS_STATE_FAILED) atomic_set(&sess->session_continuation, 1); spin_unlock_bh(&sess->conn_lock); iscsi_login_set_conn_values(sess, conn, pdu->cid); if (iscsi_copy_param_list(&conn->param_list, conn->tpg->param_list, 0) < 0) { iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, ISCSI_LOGIN_STATUS_NO_RESOURCES); return -1; } if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) iser = true; iscsi_set_keys_to_negotiate(conn->param_list, iser); /* * Need to send TargetPortalGroupTag back in first login response * on any iSCSI connection where the Initiator provides TargetName. * See 5.3.1. Login Phase Start * * In our case, we have already located the struct iscsi_tiqn at this point. */ if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt)) return -1; return 0; } int iscsi_login_post_auth_non_zero_tsih( struct iscsi_conn *conn, u16 cid, u32 exp_statsn) { struct iscsi_conn *conn_ptr = NULL; struct iscsi_conn_recovery *cr = NULL; struct iscsi_session *sess = conn->sess; /* * By following item 5 in the login table, if we have found * an existing ISID and a valid/existing TSIH and an existing * CID we do connection reinstatement. Currently we dont not * support it so we send back an non-zero status class to the * initiator and release the new connection. */ conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid); if (conn_ptr) { pr_err("Connection exists with CID %hu for %s," " performing connection reinstatement.\n", conn_ptr->cid, sess->sess_ops->InitiatorName); iscsit_connection_reinstatement_rcfr(conn_ptr); iscsit_dec_conn_usage_count(conn_ptr); } /* * Check for any connection recovery entires containing CID. * We use the original ExpStatSN sent in the first login request * to acknowledge commands for the failed connection. * * Also note that an explict logout may have already been sent, * but the response may not be sent due to additional connection * loss. */ if (sess->sess_ops->ErrorRecoveryLevel == 2) { cr = iscsit_get_inactive_connection_recovery_entry( sess, cid); if (cr) { pr_debug("Performing implicit logout" " for connection recovery on CID: %hu\n", conn->cid); iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn); } } /* * Else we follow item 4 from the login table in that we have * found an existing ISID and a valid/existing TSIH and a new * CID we go ahead and continue to add a new connection to the * session. */ pr_debug("Adding CID %hu to existing session for %s.\n", cid, sess->sess_ops->InitiatorName); if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) { pr_err("Adding additional connection to this session" " would exceed MaxConnections %d, login failed.\n", sess->sess_ops->MaxConnections); iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, ISCSI_LOGIN_STATUS_ISID_ERROR); return -1; } return 0; } static void iscsi_post_login_start_timers(struct iscsi_conn *conn) { struct iscsi_session *sess = conn->sess; /* * FIXME: Unsolicitied NopIN support for ISER */ if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) return; if (!sess->sess_ops->SessionType) iscsit_start_nopin_timer(conn); } static int iscsit_start_kthreads(struct iscsi_conn *conn) { int ret = 0; spin_lock(&iscsit_global->ts_bitmap_lock); conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap, ISCSIT_BITMAP_BITS, get_order(1)); spin_unlock(&iscsit_global->ts_bitmap_lock); if (conn->bitmap_id < 0) { pr_err("bitmap_find_free_region() failed for" " iscsit_start_kthreads()\n"); return -ENOMEM; } conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn, "%s", ISCSI_TX_THREAD_NAME); if (IS_ERR(conn->tx_thread)) { pr_err("Unable to start iscsi_target_tx_thread\n"); ret = PTR_ERR(conn->tx_thread); goto out_bitmap; } conn->tx_thread_active = true; conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn, "%s", ISCSI_RX_THREAD_NAME); if (IS_ERR(conn->rx_thread)) { pr_err("Unable to start iscsi_target_rx_thread\n"); ret = PTR_ERR(conn->rx_thread); goto out_tx; } conn->rx_thread_active = true; return 0; out_tx: kthread_stop(conn->tx_thread); conn->tx_thread_active = false; out_bitmap: 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); return ret; } int iscsi_post_login_handler( struct iscsi_np *np, struct iscsi_conn *conn, u8 zero_tsih) { int stop_timer = 0; struct iscsi_session *sess = conn->sess; struct se_session *se_sess = sess->se_sess; struct iscsi_portal_group *tpg = sess->tpg; struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; int rc; iscsit_inc_conn_usage_count(conn); iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS, ISCSI_LOGIN_STATUS_ACCEPT); pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n"); conn->conn_state = TARG_CONN_STATE_LOGGED_IN; iscsi_set_connection_parameters(conn->conn_ops, conn->param_list); /* * SCSI Initiator -> SCSI Target Port Mapping */ if (!zero_tsih) { iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 0); iscsi_release_param_list(conn->param_list); conn->param_list = NULL; spin_lock_bh(&sess->conn_lock); atomic_set(&sess->session_continuation, 0); if (sess->session_state == TARG_SESS_STATE_FAILED) { pr_debug("Moving to" " TARG_SESS_STATE_LOGGED_IN.\n"); sess->session_state = TARG_SESS_STATE_LOGGED_IN; stop_timer = 1; } pr_debug("iSCSI Login successful on CID: %hu from %pISpc to" " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr, &conn->local_sockaddr, tpg->tpgt); list_add_tail(&conn->conn_list, &sess->sess_conn_list); atomic_inc(&sess->nconn); pr_debug("Incremented iSCSI Connection count to %hu" " from node: %s\n", atomic_read(&sess->nconn), sess->sess_ops->InitiatorName); spin_unlock_bh(&sess->conn_lock); rc = iscsit_start_kthreads(conn); if (rc) return rc; iscsi_post_login_start_timers(conn); /* * Determine CPU mask to ensure connection's RX and TX kthreads * are scheduled on the same CPU. */ iscsit_thread_get_cpumask(conn); conn->conn_rx_reset_cpumask = 1; conn->conn_tx_reset_cpumask = 1; iscsit_dec_conn_usage_count(conn); if (stop_timer) { spin_lock_bh(&se_tpg->session_lock); iscsit_stop_time2retain_timer(sess); spin_unlock_bh(&se_tpg->session_lock); } iscsit_dec_session_usage_count(sess); return 0; } iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1); iscsi_release_param_list(conn->param_list); conn->param_list = NULL; iscsit_determine_maxcmdsn(sess); spin_lock_bh(&se_tpg->session_lock); __transport_register_session(&sess->tpg->tpg_se_tpg, se_sess->se_node_acl, se_sess, sess); pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n"); sess->session_state = TARG_SESS_STATE_LOGGED_IN; pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n", conn->cid, &conn->login_sockaddr, &conn->local_sockaddr, tpg->tpgt); spin_lock_bh(&sess->conn_lock); list_add_tail(&conn->conn_list, &sess->sess_conn_list); atomic_inc(&sess->nconn); pr_debug("Incremented iSCSI Connection count to %hu from node:" " %s\n", atomic_read(&sess->nconn), sess->sess_ops->InitiatorName); spin_unlock_bh(&sess->conn_lock); sess->sid = tpg->sid++; if (!sess->sid) sess->sid = tpg->sid++; pr_debug("Established iSCSI session from node: %s\n", sess->sess_ops->InitiatorName); tpg->nsessions++; if (tpg->tpg_tiqn) tpg->tpg_tiqn->tiqn_nsessions++; pr_debug("Incremented number of active iSCSI sessions to %u on" " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt); spin_unlock_bh(&se_tpg->session_lock); rc = iscsit_start_kthreads(conn); if (rc) return rc; iscsi_post_login_start_timers(conn); /* * Determine CPU mask to ensure connection's RX and TX kthreads * are scheduled on the same CPU. */ iscsit_thread_get_cpumask(conn); conn->conn_rx_reset_cpumask = 1; conn->conn_tx_reset_cpumask = 1; iscsit_dec_conn_usage_count(conn); return 0; } static void iscsi_handle_login_thread_timeout(unsigned long data) { struct iscsi_np *np = (struct iscsi_np *) data; spin_lock_bh(&np->np_thread_lock); pr_err("iSCSI Login timeout on Network Portal %pISpc\n", &np->np_sockaddr); if (np->np_login_timer_flags & ISCSI_TF_STOP) { spin_unlock_bh(&np->np_thread_lock); return; } if (np->np_thread) send_sig(SIGINT, np->np_thread, 1); np->np_login_timer_flags &= ~ISCSI_TF_RUNNING; spin_unlock_bh(&np->np_thread_lock); } static void iscsi_start_login_thread_timer(struct iscsi_np *np) { /* * This used the TA_LOGIN_TIMEOUT constant because at this * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout */ spin_lock_bh(&np->np_thread_lock); init_timer(&np->np_login_timer); np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ); np->np_login_timer.data = (unsigned long)np; np->np_login_timer.function = iscsi_handle_login_thread_timeout; np->np_login_timer_flags &= ~ISCSI_TF_STOP; np->np_login_timer_flags |= ISCSI_TF_RUNNING; add_timer(&np->np_login_timer); pr_debug("Added timeout timer to iSCSI login request for" " %u seconds.\n", TA_LOGIN_TIMEOUT); spin_unlock_bh(&np->np_thread_lock); } static void iscsi_stop_login_thread_timer(struct iscsi_np *np) { spin_lock_bh(&np->np_thread_lock); if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) { spin_unlock_bh(&np->np_thread_lock); return; } np->np_login_timer_flags |= ISCSI_TF_STOP; spin_unlock_bh(&np->np_thread_lock); del_timer_sync(&np->np_login_timer); spin_lock_bh(&np->np_thread_lock); np->np_login_timer_flags &= ~ISCSI_TF_RUNNING; spin_unlock_bh(&np->np_thread_lock); } int iscsit_setup_np( struct iscsi_np *np, struct __kernel_sockaddr_storage *sockaddr) { struct socket *sock = NULL; int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len; switch (np->np_network_transport) { case ISCSI_TCP: np->np_ip_proto = IPPROTO_TCP; np->np_sock_type = SOCK_STREAM; break; case ISCSI_SCTP_TCP: np->np_ip_proto = IPPROTO_SCTP; np->np_sock_type = SOCK_STREAM; break; case ISCSI_SCTP_UDP: np->np_ip_proto = IPPROTO_SCTP; np->np_sock_type = SOCK_SEQPACKET; break; default: pr_err("Unsupported network_transport: %d\n", np->np_network_transport); return -EINVAL; } np->np_ip_proto = IPPROTO_TCP; np->np_sock_type = SOCK_STREAM; ret = sock_create(sockaddr->ss_family, np->np_sock_type, np->np_ip_proto, &sock); if (ret < 0) { pr_err("sock_create() failed.\n"); return ret; } np->np_socket = sock; /* * Setup the np->np_sockaddr from the passed sockaddr setup * in iscsi_target_configfs.c code.. */ memcpy(&np->np_sockaddr, sockaddr, sizeof(struct __kernel_sockaddr_storage)); if (sockaddr->ss_family == AF_INET6) len = sizeof(struct sockaddr_in6); else len = sizeof(struct sockaddr_in); /* * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY. */ /* FIXME: Someone please explain why this is endian-safe */ opt = 1; if (np->np_network_transport == ISCSI_TCP) { ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (char *)&opt, sizeof(opt)); if (ret < 0) { pr_err("kernel_setsockopt() for TCP_NODELAY" " failed: %d\n", ret); goto fail; } } /* FIXME: Someone please explain why this is endian-safe */ ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&opt, sizeof(opt)); if (ret < 0) { pr_err("kernel_setsockopt() for SO_REUSEADDR" " failed\n"); goto fail; } ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND, (char *)&opt, sizeof(opt)); if (ret < 0) { pr_err("kernel_setsockopt() for IP_FREEBIND" " failed\n"); goto fail; } ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len); if (ret < 0) { pr_err("kernel_bind() failed: %d\n", ret); goto fail; } ret = kernel_listen(sock, backlog); if (ret != 0) { pr_err("kernel_listen() failed: %d\n", ret); goto fail; } return 0; fail: np->np_socket = NULL; sock_release(sock); return ret; } int iscsi_target_setup_login_socket( struct iscsi_np *np, struct __kernel_sockaddr_storage *sockaddr) { struct iscsit_transport *t; int rc; t = iscsit_get_transport(np->np_network_transport); if (!t) return -EINVAL; rc = t->iscsit_setup_np(np, sockaddr); if (rc < 0) { iscsit_put_transport(t); return rc; } np->np_transport = t; np->enabled = true; return 0; } int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn) { struct socket *new_sock, *sock = np->np_socket; struct sockaddr_in sock_in; struct sockaddr_in6 sock_in6; int rc, err; rc = kernel_accept(sock, &new_sock, 0); if (rc < 0) return rc; conn->sock = new_sock; conn->login_family = np->np_sockaddr.ss_family; if (np->np_sockaddr.ss_family == AF_INET6) { memset(&sock_in6, 0, sizeof(struct sockaddr_in6)); rc = conn->sock->ops->getname(conn->sock, (struct sockaddr *)&sock_in6, &err, 1); if (!rc) { if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) { memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6)); } else { /* Pretend to be an ipv4 socket */ sock_in.sin_family = AF_INET; sock_in.sin_port = sock_in6.sin6_port; memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4); memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in)); } } rc = conn->sock->ops->getname(conn->sock, (struct sockaddr *)&sock_in6, &err, 0); if (!rc) { if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) { memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6)); } else { /* Pretend to be an ipv4 socket */ sock_in.sin_family = AF_INET; sock_in.sin_port = sock_in6.sin6_port; memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4); memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in)); } } } else { memset(&sock_in, 0, sizeof(struct sockaddr_in)); rc = conn->sock->ops->getname(conn->sock, (struct sockaddr *)&sock_in, &err, 1); if (!rc) memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in)); rc = conn->sock->ops->getname(conn->sock, (struct sockaddr *)&sock_in, &err, 0); if (!rc) memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in)); } return 0; } int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login) { struct iscsi_login_req *login_req; u32 padding = 0, payload_length; if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0) return -1; login_req = (struct iscsi_login_req *)login->req; payload_length = ntoh24(login_req->dlength); padding = ((-payload_length) & 3); pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x," " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n", login_req->flags, login_req->itt, login_req->cmdsn, login_req->exp_statsn, login_req->cid, payload_length); /* * Setup the initial iscsi_login values from the leading * login request PDU. */ if (login->first_request) { login_req = (struct iscsi_login_req *)login->req; login->leading_connection = (!login_req->tsih) ? 1 : 0; login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags); login->version_min = login_req->min_version; login->version_max = login_req->max_version; memcpy(login->isid, login_req->isid, 6); login->cmd_sn = be32_to_cpu(login_req->cmdsn); login->init_task_tag = login_req->itt; login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn); login->cid = be16_to_cpu(login_req->cid); login->tsih = be16_to_cpu(login_req->tsih); } if (iscsi_target_check_login_request(conn, login) < 0) return -1; memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS); if (iscsi_login_rx_data(conn, login->req_buf, payload_length + padding) < 0) return -1; return 0; } int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login, u32 length) { if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0) return -1; return 0; } static int iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t) { int rc; if (!t->owner) { conn->conn_transport = t; return 0; } rc = try_module_get(t->owner); if (!rc) { pr_err("try_module_get() failed for %s\n", t->name); return -EINVAL; } conn->conn_transport = t; return 0; } void iscsi_target_login_sess_out(struct iscsi_conn *conn, struct iscsi_np *np, bool zero_tsih, bool new_sess) { if (!new_sess) goto old_sess_out; pr_err("iSCSI Login negotiation failed.\n"); iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, ISCSI_LOGIN_STATUS_INIT_ERR); if (!zero_tsih || !conn->sess) goto old_sess_out; if (conn->sess->se_sess) transport_free_session(conn->sess->se_sess); if (conn->sess->session_index != 0) { spin_lock_bh(&sess_idr_lock); idr_remove(&sess_idr, conn->sess->session_index); spin_unlock_bh(&sess_idr_lock); } kfree(conn->sess->sess_ops); kfree(conn->sess); conn->sess = NULL; old_sess_out: iscsi_stop_login_thread_timer(np); /* * If login negotiation fails check if the Time2Retain timer * needs to be restarted. */ if (!zero_tsih && conn->sess) { spin_lock_bh(&conn->sess->conn_lock); if (conn->sess->session_state == TARG_SESS_STATE_FAILED) { struct se_portal_group *se_tpg = &conn->tpg->tpg_se_tpg; atomic_set(&conn->sess->session_continuation, 0); spin_unlock_bh(&conn->sess->conn_lock); spin_lock_bh(&se_tpg->session_lock); iscsit_start_time2retain_handler(conn->sess); spin_unlock_bh(&se_tpg->session_lock); } else spin_unlock_bh(&conn->sess->conn_lock); iscsit_dec_session_usage_count(conn->sess); } if (!IS_ERR(conn->conn_rx_hash.tfm)) crypto_free_hash(conn->conn_rx_hash.tfm); if (!IS_ERR(conn->conn_tx_hash.tfm)) crypto_free_hash(conn->conn_tx_hash.tfm); free_cpumask_var(conn->conn_cpumask); kfree(conn->conn_ops); if (conn->param_list) { iscsi_release_param_list(conn->param_list); conn->param_list = NULL; } iscsi_target_nego_release(conn); if (conn->sock) { sock_release(conn->sock); conn->sock = NULL; } if (conn->conn_transport->iscsit_wait_conn) conn->conn_transport->iscsit_wait_conn(conn); if (conn->conn_transport->iscsit_free_conn) conn->conn_transport->iscsit_free_conn(conn); iscsit_put_transport(conn->conn_transport); kfree(conn); } static int __iscsi_target_login_thread(struct iscsi_np *np) { u8 *buffer, zero_tsih = 0; int ret = 0, rc; struct iscsi_conn *conn = NULL; struct iscsi_login *login; struct iscsi_portal_group *tpg = NULL; struct iscsi_login_req *pdu; struct iscsi_tpg_np *tpg_np; bool new_sess = false; flush_signals(current); spin_lock_bh(&np->np_thread_lock); if (np->np_thread_state == ISCSI_NP_THREAD_RESET) { np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; complete(&np->np_restart_comp); } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) { spin_unlock_bh(&np->np_thread_lock); goto exit; } else { np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; } spin_unlock_bh(&np->np_thread_lock); conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL); if (!conn) { pr_err("Could not allocate memory for" " new connection\n"); /* Get another socket */ return 1; } pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); conn->conn_state = TARG_CONN_STATE_FREE; if (iscsit_conn_set_transport(conn, np->np_transport) < 0) { kfree(conn); return 1; } rc = np->np_transport->iscsit_accept_np(np, conn); if (rc == -ENOSYS) { complete(&np->np_restart_comp); iscsit_put_transport(conn->conn_transport); kfree(conn); conn = NULL; goto exit; } else if (rc < 0) { spin_lock_bh(&np->np_thread_lock); if (np->np_thread_state == ISCSI_NP_THREAD_RESET) { spin_unlock_bh(&np->np_thread_lock); complete(&np->np_restart_comp); iscsit_put_transport(conn->conn_transport); kfree(conn); conn = NULL; /* Get another socket */ return 1; } spin_unlock_bh(&np->np_thread_lock); iscsit_put_transport(conn->conn_transport); kfree(conn); conn = NULL; goto out; } /* * Perform the remaining iSCSI connection initialization items.. */ login = iscsi_login_init_conn(conn); if (!login) { goto new_sess_out; } iscsi_start_login_thread_timer(np); pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n"); conn->conn_state = TARG_CONN_STATE_XPT_UP; /* * This will process the first login request + payload.. */ rc = np->np_transport->iscsit_get_login_rx(conn, login); if (rc == 1) return 1; else if (rc < 0) goto new_sess_out; buffer = &login->req[0]; pdu = (struct iscsi_login_req *)buffer; /* * Used by iscsit_tx_login_rsp() for Login Resonses PDUs * when Status-Class != 0. */ conn->login_itt = pdu->itt; spin_lock_bh(&np->np_thread_lock); if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { spin_unlock_bh(&np->np_thread_lock); pr_err("iSCSI Network Portal on %pISpc currently not" " active.\n", &np->np_sockaddr); iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); goto new_sess_out; } spin_unlock_bh(&np->np_thread_lock); conn->network_transport = np->np_network_transport; pr_debug("Received iSCSI login request from %pISpc on %s Network" " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name, &conn->local_sockaddr); pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n"); conn->conn_state = TARG_CONN_STATE_IN_LOGIN; if (iscsi_login_check_initiator_version(conn, pdu->max_version, pdu->min_version) < 0) goto new_sess_out; zero_tsih = (pdu->tsih == 0x0000); if (zero_tsih) { /* * This is the leading connection of a new session. * We wait until after authentication to check for * session reinstatement. */ if (iscsi_login_zero_tsih_s1(conn, buffer) < 0) goto new_sess_out; } else { /* * Add a new connection to an existing session. * We check for a non-existant session in * iscsi_login_non_zero_tsih_s2() below based * on ISID/TSIH, but wait until after authentication * to check for connection reinstatement, etc. */ if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0) goto new_sess_out; } /* * SessionType: Discovery * * Locates Default Portal * * SessionType: Normal * * Locates Target Portal from NP -> Target IQN */ rc = iscsi_target_locate_portal(np, conn, login); if (rc < 0) { tpg = conn->tpg; goto new_sess_out; } login->zero_tsih = zero_tsih; conn->sess->se_sess->sup_prot_ops = conn->conn_transport->iscsit_get_sup_prot_ops(conn); tpg = conn->tpg; if (!tpg) { pr_err("Unable to locate struct iscsi_conn->tpg\n"); goto new_sess_out; } if (zero_tsih) { if (iscsi_login_zero_tsih_s2(conn) < 0) goto new_sess_out; } else { if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0) goto old_sess_out; } ret = iscsi_target_start_negotiation(login, conn); if (ret < 0) goto new_sess_out; if (!conn->sess) { pr_err("struct iscsi_conn session pointer is NULL!\n"); goto new_sess_out; } iscsi_stop_login_thread_timer(np); if (signal_pending(current)) goto new_sess_out; if (ret == 1) { tpg_np = conn->tpg_np; ret = iscsi_post_login_handler(np, conn, zero_tsih); if (ret < 0) goto new_sess_out; iscsit_deaccess_np(np, tpg, tpg_np); } tpg = NULL; tpg_np = NULL; /* Get another socket */ return 1; new_sess_out: new_sess = true; old_sess_out: tpg_np = conn->tpg_np; iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess); new_sess = false; if (tpg) { iscsit_deaccess_np(np, tpg, tpg_np); tpg = NULL; tpg_np = NULL; } out: return 1; exit: iscsi_stop_login_thread_timer(np); spin_lock_bh(&np->np_thread_lock); np->np_thread_state = ISCSI_NP_THREAD_EXIT; spin_unlock_bh(&np->np_thread_lock); return 0; } int iscsi_target_login_thread(void *arg) { struct iscsi_np *np = arg; int ret; allow_signal(SIGINT); while (1) { ret = __iscsi_target_login_thread(np); /* * We break and exit here unless another sock_accept() call * is expected. */ if (ret != 1) break; } return 0; }